阅读说明：本技术 用于连接管道、特别是用于连接柔性管道的配件 (Fitting for connecting pipes, in particular for connecting flexible pipes ) 是由 翁贝托·贝尔托洛蒂 马里奥·孔蒂尼 于 2020-04-22 设计创作，主要内容包括：本发明涉及一种用于连接管道(T)、特别是用于连接柔性管道的配件(1),该配件包括第一管状元件(3)和第二管状元件(4),该第一管状元件设置有第一入口/出口开口(3a)并且在第一管状元件的内部限定第一导管(3b),该第二管状元件设置有第二入口/出口开口(4a)并且在第二管状元件的内部限定第二导管(4b)；两个管状元件以使得第一导管和第二导管处于连通状态的方式彼此连接。配件包括第一衬套(11),该第一衬套与第一管状元件相关联以外部地环绕第一管状元件并且创建环形壳体(12),该第一衬套能够以插入构型和夹持构型进行操作,在该插入构型中,第一衬套允许将管道(T)插入环形壳体中,在该夹持构型中,第一衬套以流体密封的方式按压并且锁定管道。配件包括第一衬套保持件(30),该第一衬套保持件(30)与第一管状元件外部相关联并且构造成用于安装第一衬套使得第一衬套保持件限定环形壳体,该第一衬套保持件包括密封部分(31),该密封部分围绕第一管状元件的密封区段(40)外部缠绕并且与第一管状元件的密封区段接触。密封部分(31)插置于管道的插入环形壳体中的部分与密封区段(40)之间,并且当第一衬套处于夹持构型时实现流体密封垫圈,从而防止第一导管与配件的外部之间的流体泄漏。(The invention relates to a fitting (1) for connecting pipes (T), in particular flexible pipes, comprising a first tubular element (3) provided with a first inlet/outlet opening (3a) and defining a first duct (3b) inside the first tubular element, and a second tubular element (4) provided with a second inlet/outlet opening (4a) and defining a second duct (4b) inside the second tubular element; the two tubular elements are connected to each other in such a way that the first and second conduits are in communication. The fitting comprises a first bush (11) associated with the first tubular element to externally surround the first tubular element and create an annular housing (12), the first bush being operable in an insertion configuration in which it allows the insertion of the pipe (T) into the annular housing, and a gripping configuration in which it presses and locks the pipe in a fluid-tight manner. The fitting comprises a first liner retainer (30), the first liner retainer (30) being associated externally with the first tubular element and configured for mounting the first liner such that the first liner retainer defines an annular housing, the first liner retainer comprising a sealing portion (31) wrapped around the outside of and in contact with a sealing section (40) of the first tubular element. A sealing portion (31) is interposed between the portion of the pipe inserted in the annular housing and the sealing section (40) and effects a fluid-tight gasket when the first bush is in the clamped configuration, preventing fluid leakage between the first conduit and the exterior of the fitting.)

1. Fitting (1) for connecting pipes (T), in particular for connecting at least one flexible pipe, the fitting (1) comprising:

-at least a first tubular element (3) provided with a first inlet/outlet opening (3a) at one end of the first tubular element (3) and defining a first duct (3b) inside the first tubular element (3);

-at least a second tubular element (4), provided with a second inlet/outlet opening (4a) at one end of the second tubular element (4) and defining a second duct (4b) inside the second tubular element (4),

the first tubular element (3) and the second tubular element (4) being connected to each other at respective opposite ends to respective inlet/outlet openings in such a way that the first conduit (3b) and the second conduit (4b) are in communication with each other and generally define a connecting conduit (2) of the fitting, so as to place the first inlet/outlet opening (3a) and the second inlet/outlet opening (4a) in fluid communication,

the fitting comprises at least a first bush (11), the first bush (11) being associable with the first tubular element (3) in such a way that: said first bush (11) externally surrounding said first tubular element (3) and creating an annular housing (12) between itself and said first tubular element, said annular housing (12) being intended to receive, in an interposed manner, a pipe (T) interposed between said first tubular element and said first bush, said first bush having an inner surface (11a) and an outer surface (11b), said inner surface (11a) being directed towards said first tubular element (3);

wherein at least the first tubular element (3) has an outer surface (6) directed towards the first bushing (11) and an inner surface (7) directed towards and defining the first conduit (3b),

the first bush (11) being configured for operating at least in an insertion configuration, in which the first bush (11) allows the insertion of a pipe (T) into the annular housing (12), and in a clamping configuration, in which the first bush (11) presses and stably locks the pipe in the annular housing in a fluid-tight manner,

wherein the fitting further comprises at least a first bush holder (30), the first bush holder (30) being associated externally to the first tubular element (3) in such a way that the first bush (11) is positioned around the first tubular element (3) at a certain distance from the first tubular element (3) and defines the annular housing (12) and being configured for mounting the first bush (11) on the first tubular element,

wherein the first liner retainer (30) comprises a sealing portion (31), the sealing portion (31) being externally wrapped around and in contact with a sealing section (40) of the first tubular element,

said sealing portion (31) being configured for being interposed between a portion of said pipe (T) and said sealing section (40) of said first tubular element (3) once said pipe (T) is inserted in said annular housing (12),

the sealing portion (31) of the first bush holder (30) forms a fluid-tight gasket at least when the first bush is in the clamped configuration, preventing fluid leakage between the first conduit (3b) and the exterior of the fitting (1).

2. The fitting (1) according to claim 1, wherein the first bushing retainer (30) comprises a hook-shaped portion (35), the hook-shaped portion (35) being configured for receiving a longitudinal end of the first bushing (11) and stably fixing the first bushing to the first bushing retainer (30), and/or wherein the hook-shaped portion (35) extends externally and radially away from the sealing portion (31), and/or wherein the first bushing retainer (30) is a single-piece element, and/or wherein the first bushing retainer (30) is made of a single piece, i.e. the sealing portion (31) and the hook-shaped portion (35) are made of a single piece.

3. Fitting (1) according to claim 1 or 2, wherein the sealing portion (31) of the first bush retainer (30) is pressed between the pipe (T) inserted and pressed in the annular housing (12) and the sealing section (40) of the first tubular element (3) when the first bush (11) is in the clamped configuration, and/or wherein the first bush retainer (30) is structurally and functionally interposed between the first bush (11) and the first tubular element (3), and/or wherein the first bush retainer (30) is associated in a removable manner with the first tubular element (3).

4. Accessory (1) according to any one of the previous claims, wherein the first bush holder (30) is associated with the first tubular element (3) in a position radially withdrawn and moved away from the end of the first tubular element defining the first inlet/outlet opening (3a),

and/or wherein the first tubular element (3) comprises a locking section (45), said locking section (45) being configured for allowing a stable connection of the pipe (T) inserted in the annular housing (12) when the first bush (11) is in the clamped configuration, and for preventing the pipe from being extracted from the fitting,

and/or wherein the sealing portion (31) of the first bushing holder (30) functionally corresponds to a gasket or an O-ring and no further sealing element is required for the sealing fixation of a pipe (T) to the first tubular element (3), and/or wherein the sealing portion (31) has an annular shape or a hollow cylindrical shape or a band shape.

5. Fitting (1) according to any one of the preceding claims, wherein the first tubular element (3) has a substantially hollow cylindrical shape with a first longitudinal extension axis (X) and/or wherein the locking section (45) and the sealing section (40) are arranged consecutively one after the other along a direction coinciding with the first longitudinal extension axis (X); and/or wherein said sealing section (40) is defined by and occupies a longitudinal portion of said external surface (6) of said first tubular element (3), and said locking section (45) is defined by and occupies a corresponding longitudinal portion of said external surface (6) of said first tubular element (3).

6. The fitting (1) according to any of the preceding claims, wherein the locking section (45) extends starting from a first inlet/outlet opening (3a) and the sealing section (40) is located downstream of the locking section along the first longitudinal extension axis (X), and/or wherein the locking section (45) ends at the first inlet/outlet opening (3a) or opens into the first inlet/outlet opening (3a), and/or wherein the locking section (45) and the sealing section (40) are located one after the other in the first tubular element (3) and extend continuously with respect to each other to form a single first tubular element (3).

7. Fitting (1) according to any one of the preceding claims, wherein the sealing portion (31) of the first bushing holder (30) has an outer diameter and preferably a constant thickness, and/or wherein the locking section (45) has a first diameter on the outer surface (6) of the first tubular element (3) and the sealing section (40) has a second diameter on the outer surface of the first tubular element, which is smaller than the first diameter by an amount substantially equal to the thickness of the sealing portion (31) of the first bushing holder (30), in such a way that the sealing portion (31) wound around the outside of the first tubular element (3) is substantially flush with the outer surface of the locking section, in which case the outer diameter of the sealing portion (31) substantially coincides with the first diameter, and/or wherein the sealing section (40) of the first tubular element (3) having the second diameter smaller than the first diameter forms an annular seat (42) housing the sealing portion (31) of the first bush retainer (30), and/or wherein the sealing portion (31) of the first bush retainer (30) inserted in the annular seat (42) of the sealing section of the first tubular element determines the mounting of the first bush retainer (30) on the first tubular element (3) and the mounting of the first bush (11) with the first bush retainer (30).

8. Fitting (1) according to any one of the preceding claims, wherein the first bush (11) has an internal diameter on an internal surface (11a) of the first bush (11) and in the inserted configuration, and the difference between the value of this internal diameter of the bush and the value of the first diameter of the locking section (45) corresponds to the radial extension of the annular housing (12) and thus allows at least the insertion of the pipe (T) to be fitted, and/or wherein the first bush holder (30) and the first bush (11) mounted on the first bush holder (30) are integral with each other and are a single assembly in the fitting use condition.

9. Fitting (1) according to any one of the preceding claims, wherein the first bush retainer (30) is made of rubber or of a plastic material, and/or wherein the first bush retainer (30) is made of a single piece and of a single material, and/or wherein the first bush retainer (30) is made by means of moulding, and/or wherein at least the sealing portion (31), or preferably the entire first bush retainer (30), of the first bush retainer (30) is made of a material adapted to maintain elastic or plastic deformation following the transition of the first bush (11) from the insertion configuration to the clamping configuration, in such a way as to determine a fluid-tight locking of the duct (T) in the annular housing (12).

10. The fitting (1) according to any of the preceding claims, wherein the sealing portion (31) and the hook portion (35) of the first bushing retainer (30) are joined together at an intermediate section (38) to form a single bushing retainer (30), and/or wherein the sealing portion (31) and the hook portion (35) extend on opposite sides with respect to the intermediate section (38) and are functionally separated from the intermediate section (38), and/or wherein the intermediate section (38) is shared between and connects the sealing portion and the hook portion, and/or wherein the first bushing retainer (30) extends continuously from the free end (32) of the sealing portion up to the free end (36) of the hook-shaped portion (35).

11. Fitting (1) according to any one of the preceding claims, wherein a section of the first bushing retainer (30) on a half-plane passing through the longitudinal extension axis is generally C-shaped or U-shaped, the free end (32) of the sealing portion (31) and the free end (36) of the hook-shaped portion (35) being directed towards the first inlet/outlet opening (3a) of the first tubular element (3), and/or wherein the sealing portion (31) is tubular in shape, and/or wherein, the sealing section (40) occupies a longitudinal portion of the first tubular element (3), the longitudinal portion has an extension equal to at least 1/10, or at least 1/5, or at least 1/3, or about half of the entire longitudinal extension of the first tubular element.

12. Fitting (1) according to any one of the preceding claims, wherein the first bush (11) extends along the longitudinal extension axis (X) between a first end (11c) and a second end (11d) opposite to the first end, the first end (11c) being intended to be mounted on the hook-shaped portion (35) of the first bush holder (30), the second end (11d) being free and defining an opening for inserting a pipe (T) into an annular housing (12), and/or wherein the first end (11c) of the first bush (11) has a mounting element configured for being inserted in a mounting seat (37) of the hook-shaped portion (35) of the first bush holder (30) to determine the assembly of the bush with the bush holder, or wherein, alternatively, the assembly constituted by the first bush retainer (30) and the first bush (11) is formed by means of an operation in which the first bush retainer is directly co-moulded with the first bush in such a way as to make them integral, and/or wherein, in the co-moulding operation, the first bush retainer (30) is made of a first material, for example a first plastic material, and the first bush (11) is made of a second material, for example a second plastic material or a metallic material.

13. The fitting (1) according to any of the preceding claims, wherein the transition of the first bush (11) from the insertion configuration to the clamping configuration occurs by means of a radial deformation of the first bush (11) close to the first tubular element (3) to compress the pipe (T) between the first bush (11) and the first tubular element (3) inside the tubular housing (12), the deformation being achieved by enabling a plastic deformation of the first bush by acting on the outer surface (11b) thereof with a clamping profile (P1) of a clamping gripper (P), and/or wherein the transition of the first bush to the clamping configuration results in a reduction of the radial extension of the annular housing (12) by the first bush (11) close to the first tubular element (3) and thus compacting the pipe inside the annular housing (T), and/or wherein, when the first bush (11) is in the gripping configuration, the sealing portion (31) of the first bush retainer (30) is deformable so as to prevent the passage of fluid between the first conduit (3b) and the outer surface of the first tubular element (3), and/or wherein, when the first bush (11) is introduced into the gripping configuration with consequent plastic deformation, the hook-shaped portion (35) remains unchanged, while the sealing portion (31) undergoes a deformation, which can be of the elastic or plastic type, depending on the material constituting the bush retainer (30).

14. Method for manufacturing a fitting (1) for connecting pipes, in particular for connecting flexible pipes, comprising the steps of:

-arranging at least a first tubular element (3), provided with a first inlet/outlet opening (3a) at one end of the first tubular element (3) and defining a first duct (3b) inside the first tubular element (3);

-arranging at least a second tubular element (4), provided with a second inlet/outlet opening (4a) at one end of the second tubular element (4) and defining a second duct (4b) inside the second tubular element (4);

the first conduit (3b) and the second conduit (4b) being connected together at respective opposite ends to respective inlet/outlet openings in such a way that they are in communication with each other and generally define a connecting conduit (2) of the fitting (1), so as to place the first inlet/outlet opening (3a) and the second inlet/outlet opening (4a) in fluid communication,

-arranging at least a first bush (11), said first bush (11) having a hollow cylindrical shape and having a longitudinal extension axis, said first bush (11) being associable with said first tubular element (3) in such a way that: said first bush (11) externally surrounding said first tubular element (3) and creating an annular housing (12) between itself and said first tubular element, said annular housing (12) being intended to receive, in an inserted manner, a pipe (T) interposed between said first tubular element and said first bush, said first bush having an inner surface (11a) and an outer surface (11b), said inner surface (11a) being intended to be directed towards said first tubular element (3), wherein at least said first tubular element (3) has an outer surface (6) intended to be directed towards said first bush (11) and an inner surface (7) directed towards and defining said first duct (3b), said first bush (11) being configured for operating at least in an insertion configuration and a clamping configuration, in which insertion configuration, the first bush (11) allows to insert a pipe (T) in the annular housing (12), in the clamped configuration the first bush (11) pressing and stably locking the pipe in the annular housing in a fluid-tight manner;

-arranging at least a first bush holder (30), the first bush holder (30) being configured for mounting the first bush (11) on the first tubular element (3) in such a way that the first bush (11) is positioned around the first tubular element (3) at a certain distance from the first tubular element (3) and defines the annular housing (12),

wherein the first liner retainer (30) comprises a sealing portion (31), the sealing portion (31) being intended to be wrapped around the outside of the sealing section (40) of the first tubular element (3) and in contact with the sealing section (40) of the first tubular element (3),

said sealing portion (31) being configured for being interposed between a portion of said pipe (T) and said sealing section (40) of said first tubular element (3) once said pipe (T) is inserted in said annular housing (12),

-at least when the first bush (11) is in the clamped configuration, the sealing portion (31) of the first bush holder (30) forms a fluid-tight gasket, preventing fluid leakage between the first conduit (3b) and the outside of the fitting (1);

-associating the first liner holder (30) externally to the first tubular element (3) with the sealing portion (31) wound around and in contact with the sealing section (40) of the first tubular element externally;

-associating the first bush (11) with the first bush holder in such a way that the first bush (11) externally surrounds the first tubular element (3) and creates the annular housing (12) between the internal surface (11a) of the bush itself and the external surface (6) of the first tubular element.

15. Method according to claim 14, wherein in the step of arranging at least a first bushing retainer (30), the first bushing retainer, including the sealing portion (31), is made in a single piece, preferably by means of a moulding operation, and/or wherein the first bushing retainer (30) is made of rubber or of a plastic material, and/or wherein at least the sealing portion (31), or preferably the entire first bushing retainer (30), of the first bushing retainer (30) is made of a material suitable for maintaining an elastic or plastic deformation after the transition of the first bushing (11) from the insertion configuration to the clamping configuration, in such a way as to determine a fluid-tight locking of the conduit (T) in the annular housing (12).

Technical Field

The present invention is intended for fittings for connecting pipes and has particular application in the context of connecting flexible pipes for the circulation of pressurized fluids, for example for the circulation of water.

Background

The invention may have advantageous application in the context of hot hydraulic plants and/or plants for distributing water in buildings of the residential, commercial or industrial type.

As is known, the connection of flexible pipes is generally obtained by arranging a fitting in the shape of a rigid tubular element provided with two or more ends able to be coupled to the same number of pipes and adapted to place the latter in fluid communication with each other with the fluid seal facing towards the outside.

One or more of the ends of the fitting intended to be coupled with the flexible pipe usually have a shaped anchoring surface on which the flexible pipe is forced to adhere and on which it is stably clamped following elastic or permanent deformation. Such anchoring surface can be obtained by means of a surface having an annular groove with which the pipe is forced to couple due to its elastic deformability. Such anchoring surfaces are usually made externally to the tip and then the tip itself is inserted into one end of the pipe stably associated with the pipe. The ends of the fittings may all be provided with anchoring surfaces with grooves for coupling the pipes by means of deformation, or the ends of the fittings may be manufactured, for example, by means of threaded surfaces, wherein the pipes are forced into engagement by means of a threaded connection; alternatively, the threaded surface of the tip may be connected to the valve.

In order to ensure a fluid seal between the inside of the tubular element and the outside of the pipe associated with the tubular element, preventing fluid from leaking towards the outside, it is common to employ an external sheath (commonly known as a "liner"), for example a metal sheath, which encloses the end of the pipe coupled to the tubular element and is then permanently deformed, for example by applying a compression using a gripper, so as to generate a compression of the underlying pipe. In this way, the pipe is forced to squeeze the lower extremity, creating a stable coupling with the lower extremity. Such fittings are generally known as "pressure fittings" (or "press fits" in technical terminology).

To improve the fluid seal between the interior and the external environment of the fitting/pipe connection, a gasket, such as an O-ring, is typically provided for interposition between each end of the fitting and the respective pipe coupled to each end of the fitting.

An example of a pressure fitting of a known type is constituted by a brass fitting, for example of the type described in patent document EP2677223 representative of the same applicant. These fittings are generally obtained by starting from a brass bar, which is moulded to define the shape of the fitting and of the internal conduit for the passage of the fluid. In addition, an annular groove or rib (typically made by machining) is made on the outer surface of the end of the fitting, which allows the flexible pipe to be anchored to the end, as described above. In addition, brass fittings typically have one or more washers externally fitted on each end, such as a washer fitted in an intermediate position between various annular grooves for clamping the pipe. In some cases, the washer may project radially beyond the majority of the grooves present on the anchoring surface in the following manner: the gasket is pressed and deformed together with the connected pipes after the outer sheath (or bush) is crushed; the gasket adheres more effectively to both the end of the fitting and to the pipe fitted to the end of the fitting, and prevents fluid between the end of the fitting and the pipe from leaking to the outside even under high operating pressure conditions.

Disclosure of Invention

The applicant has encountered that the above-mentioned solution is not without drawbacks and can be improved in several respects.

First of all, such pressure fittings are complicated from a production process point of view, which determines high production costs.

In addition, the fittings of the known type are characterized by complex and difficult installation, due to the various components required to ensure the correct gripping and locking of the flexible pipe to the fitting, and by the fact that the fluid seal is obtained once the flexible pipe has been pressed. For example, improper or unstable positioning of a gasket interposed between the end of the fitting and the corresponding pipe can result in leakage of fluid.

In addition, the performance of the fittings of the known type may deteriorate after long installation times or under high operating pressures.

In addition, in known solutions, the presence of temperature variations or mechanical stresses of the conveyed fluid can lead to poor operation or to malfunctioning or malfunctioning of the equipment.

In this case, in various aspects and/or embodiments of the present invention, it is an object underlying the present invention to provide a fitting for connecting pipes which is able to overcome the above-mentioned drawbacks.

A further object of the present invention is to propose a fitting for connecting pipes which enables the effective connection of pipes, in particular flexible pipes for the circulation of pressurized fluids, pipes made of plastic material or "multilayer" pipes (i.e. pipes comprising superimposed layers of different materials, wherein one or more of such layers are made of metallic material).

A further object of the invention is to propose a fitting for connecting pipes characterized by reduced manufacturing costs.

A further object of the invention is to propose a fitting for connecting pipes which is simple and quick to manufacture.

A further object of the invention is to propose a fitting for connecting pipes which is characterized by simplified installation.

Another object of the invention is to make a fitting for connecting pipes which has a high operating reliability.

A further object of the present invention is to provide a fitting for connecting pipes which is characterized by a simple and rational structure.

A further object of the present invention is to create alternative solutions in the manufacture of fittings for connecting pipes and/or to open up new design areas with respect to the prior art.

These objects, as well as other possible objects that will become clearer in the course of the following description, are substantially achieved by a fitting for connecting pipes according to one or more of the appended claims, each presented individually (with the relevant dependent claims) or in any combination with the other claims, and the following aspects and/or embodiments are also presented in various combinations with the preceding claims.

Various aspects of the invention are set forth below.

In a first aspect thereof, the present invention relates to a fitting for connecting pipes, in particular for connecting at least one flexible pipe, comprising:

-at least one first tubular element provided with a first inlet/outlet opening at one end thereof and defining a first duct inside the first tubular element;

-at least one second tubular element provided with a second inlet/outlet opening at one end thereof and defining a second duct inside the second tubular element,

the first and second tubular elements are connected to each other at respective opposite ends to respective inlet/outlet openings in such a way that the first and second conduits are in communication with each other and generally define a connecting conduit of the fitting, thereby placing the first and second inlet/outlet openings in fluid communication.

In one aspect, the fitting comprises at least one first bushing associable with the first tubular element in such a way as to: the first bush externally surrounds the first tubular element and creates an annular housing between itself and the first tubular element, intended to receive, in interposed manner, a pipe (T) interposed between the first tubular element and the first bush, the first bush having an inner surface and an outer surface, the inner surface being directed towards the first tubular element.

In one aspect, at least the first tubular element has an outer surface directed toward the first liner and an inner surface directed toward and defining the first conduit.

In one aspect, the first bush is configured for operating at least in an insertion configuration, in which it allows the insertion of a pipe (T) into the annular housing, and in a clamping configuration, in which it presses and stably locks the pipe in the annular housing in a fluid-tight manner.

In one aspect, the fitting further comprises at least one first bush holder associated externally to the first tubular element in such a way that it is (stably) positioned around the first tubular element at a certain distance from the first tubular element (3) and defines the annular housing and configured for mounting the first bush on the first tubular element.

In one aspect, the first liner retainer includes a sealing portion externally wrapped around and in contact with a sealing section of the first tubular element, the sealing portion being configured for interposition between a portion of the pipe (T) and the sealing section of the first tubular element once the pipe (T) is inserted into the annular housing (12).

In one aspect, the sealing portion of the first liner retainer obtains (forms) a fluid-tight gasket, at least when the first liner is in the clamped configuration, thereby preventing fluid leakage between the first conduit and an exterior of the fitting.

In one aspect, when the first bushing is in the clamped configuration, the sealing portion of the first bushing retainer is compressed between the pipe inserted and compressed in the annular housing and the sealing section of the first tubular element, the pipe being inserted and compressed in the annular housing.

In one aspect, a first bushing retainer includes a hook portion configured to receive a longitudinal end of the first bushing and to stably secure the first bushing to the first bushing retainer.

In one aspect, the hook portion extends outwardly and radially away from the sealing portion.

In one aspect, the first bushing retainer is a one-piece member.

In one aspect, the first bushing retainer is made of a single piece, i.e., the hook portion and the sealing portion are made of a single piece.

In one aspect, the hook portion and the sealing portion are made of a single piece and the hook portion and the sealing portion are simultaneously separated from each other, the hook portion being configured for supporting the first bushing and the sealing portion being configured for ensuring a fluid seal over the first tubular element.

In one aspect, the hook portion is spaced outwardly from and not in contact with the first tubular element.

In one aspect, the first tubular element comprises a locking section configured for allowing a stable connection of the pipe inserted in the annular housing when the first bush is in the clamped configuration and for preventing the pipe from coming off the fitting.

In one aspect, the sealing portion of the first bushing retainer functionally corresponds to a gasket or O-ring, and no other sealing element is required for the sealing fixation of the conduit to the first tubular element.

In a separate aspect thereof, the present invention relates to a method of manufacturing a fitting for connecting pipes, in particular for connecting flexible pipes, comprising the steps of:

-arranging at least one first tubular element provided with a first inlet/outlet opening at one end thereof and defining a first duct inside said first tubular element;

-arranging at least one second tubular element provided at one end thereof with a second inlet/outlet opening and defining a second duct inside the second tubular element;

the first and second conduits are connected to each other at respective opposite ends to respective inlet/outlet openings in such a way that the first and second conduits are in communication with each other and generally define a connecting conduit of the fitting, thereby placing the first and second inlet/outlet openings in fluid communication.

In one aspect, the method comprises the step of arranging at least one first bush having a hollow cylindrical shape and having a longitudinal extension axis, the first bush being associable with the first tubular element in such a way as to: said first bush externally surrounding said first tubular element and creating an annular housing between itself and said first tubular element, intended to receive in inserted manner a pipe (T), such a pipe is interposed between the first tubular element and the first bushing, the first bushing having an inner surface and an outer surface, the inner surface being intended to be directed towards the first tubular element, wherein at least the first tubular element has an outer surface intended to be directed towards the first bushing and an inner surface directed towards and defining the first conduit, the first bushing being configured for operating at least in an insertion configuration and a clamping configuration, in the insertion configuration, the first bushing allows the insertion of a pipe (T) into the annular housing, in the clamped configuration, the first bushing presses and locks stably the pipe in the annular housing in a fluid-tight manner.

In one aspect, the method comprises the step of arranging at least one first bush holder configured for mounting the first bush on the first tubular element in such a way that the first bush (11) is positioned around the first tubular element (3) at a certain distance from the first tubular element (3) and defines the annular casing (12), wherein the first bush holder comprises a sealing portion intended to be wound around the outside of and in contact with a sealing section of the first tubular element, the sealing portion being configured for interposing between a portion of the pipe and the sealing section of the first tubular element once the pipe is inserted in the annular casing, at least when the first bush is in the clamped configuration, the sealing portion of the first liner retainer achieves a fluid-tight gasket to prevent fluid leakage between the first conduit and the exterior of the fitting.

In one aspect, the method includes the step of associating the first liner retainer externally of the first tubular element with the sealing portion wrapped around and in contact with the sealing section of the first tubular element.

In one aspect, the method comprises the step of associating the first bush with the first bush holder in such a way that the first bush (11) externally surrounds the first tubular element (3) and creates the annular housing (12) between the inner surface (11a) of the bush itself and the outer surface (6) of the first tubular element.

In one aspect, in said step of arranging at least one first bushing-holder, said first bushing-holder, including said sealing portion, is made of a single piece, preferably by means of a molding operation.

In one aspect, in said step of arranging at least one first bushing holder and arranging at least one first bushing, the assembly formed by the first bushing holder and the first bushing is obtained by means of a co-moulding operation of the first bushing holder directly with the first bushing, as follows: the first bushing retainer is integral with the first bushing.

In one aspect, in the co-molding operation, the bushing holder is made of a first material, such as a first plastic material, and the first bushing is made of a second material, such as a second plastic material or a metal material.

In one aspect, the fitting is obtained starting from a metal pipe, preferably a freshly made pipe, comprising said first tubular element and said second tubular element in a single piece, said metal pipe being subjected to a forming operation and/or a bending operation.

In one aspect, the method further comprises the step of making at least one through opening between an external surface (facing the outside of the fitting) of the first tubular element and an internal surface of the first tubular element directed towards and defining the first conduit in the following manner: such that said through openings define respective empty spaces between the external and internal surfaces of the first tubular element.

In one aspect, the method comprises the step of inserting one end of the pipe to be connected to the fitting into the annular housing in such a way that the pipe is fitted on the first tubular element and is partially enclosed by the first bush.

In one aspect, the method comprises the step of applying a clamping force on the outer surface of the first bush, preferably by means of a clamping profile of a clamping gripper, capable of radially deforming, preferably plastically deforming, said first bush so as to approach the first tubular element, in such a way as to compress the pipe between the first bush and the first tubular element inside the annular housing, and to lock the pipe stably in the annular housing itself in a fluid-tight manner.

In one aspect, during the step of applying a clamping force on the outer surface of the first liner, the sealing portion of the liner retainer is deformed in such a way as to prevent fluid communication between the first conduit and the outer surface of the first tubular element.

The method may comprise the step of arranging a device for connection to a fluid source, such as a conduit, a tap or a cistern, on the first tubular element or the second tubular element. Such a connection means may comprise a threaded portion intended to be connected to a corresponding counter-thread of said fluid source to place the tubular element in fluid communication with the fluid source.

In one aspect thereof, the invention relates to a device comprising at least one fitting according to one or more of the aspects and/or one or more of the claims and at least one pipe connected to the at least one fitting.

Each of the foregoing aspects of the invention may be presented alone or in combination with any of the claims or with any of the other aspects described.

Drawings

Further features and advantages will become clearer from the detailed description of several embodiments, which also include exemplary but not exclusive preferred embodiments of the fitting for connecting pipes according to the present invention. Such description will be elucidated hereinafter with reference to the accompanying drawings, which are provided as non-limiting examples only, wherein:

figure 1 shows a perspective view of a possible embodiment of a fitting for connecting pipes, in particular for connecting at least one flexible pipe, according to the invention, with several parts removed;

figure 2 shows a side view of the fitting of figure 1 with no parts removed;

figure 3 shows a cross-sectional view of the fitting of figure 2;

figure 4 shows a perspective and exploded view of the fitting of figure 2;

figure 5 shows a cross-sectional view and an exploded view of the fitting of figure 2;

figure 6 shows a front perspective view of the bush holder of the fitting for connecting pipes of figure 1;

figure 7 shows a rear perspective view of the bush retainer of figure 6;

figure 8 shows a cross-sectional view of the bush retainer of figures 6 and 7;

figure 9 shows a cross-sectional view of the fitting of figure 2 with the multilayer pipe inserted therein (inserted configuration);

figure 10 shows the fitting of figure 9 during an operation of clamping a multilayer pipe (transition between insertion and clamping configurations);

figure 11 shows the fitting of figures 9 and 10, on which the multilayer tubing is mounted at the end of the clamping operation (clamping configuration);

fig. 12 shows a partial enlargement of the view of fig. 11.

Detailed Description

With reference to the above figures, the reference numeral 1 generally designates a fitting according to the invention for connecting pipes T, in particular for connecting flexible pipes. In general, the same reference numerals are used for the same elements and the like, which may be in embodiment variations of the present invention.

The fitting 1 is used for the interconnection of a pipe T for conveying a pressurized fluid. Such a duct T may be of the type made of a single material (for example, rubber or plastic), or may be of the so-called "multilayer" type (as shown in fig. 9, 10, 11, 12). A multilayer pipe "T" is, for example, a pipe comprising superimposed layers of different materials, and wherein, in particular, one or more of such layers are made of a metallic material. For example, as shown in fig. 9, 10, 11 and 12, the multilayer may comprise three superimposed layers T1, T2 and T3 (glued together, preferably by means of intermediate adhesive layers); preferably, the outer layer T1 and the inner layer T3 are made of plastic, and the intermediate layer T2 is made of a metal material (e.g., aluminum).

With reference to the exemplary and non-exclusive embodiment shown in the accompanying drawings, the fitting 1 comprises a first (or terminal) tubular element 3 and a second (or terminal) tubular element 4, the first tubular element 3 and the second tubular element 4 being provided with a first inlet/outlet opening 3a and a second inlet/outlet opening 4a, respectively, and the first tubular element 3 and the second tubular element 4 defining, inside themselves, a first duct 3b and a second duct 4b, respectively. The two tubular elements are connected to each other at respective opposite ends to respective inlet/outlet openings in such a way that the first conduit 3b and the second conduit 4b are in communication with each other and define overall a junction conduit 2 of the fitting, which junction conduit 2 places the first opening 3a and the second opening 4a in fluid communication.

Preferably, the fitting 1 is also provided with at least a first bush 11, which first bush 11 can be associated with the first tubular element 3, preferably in a removable manner, as follows: the first bush 11 externally surrounds the first tubular element 3 and creates, between the bush itself and the first tubular element, an annular housing 12, which annular housing 12 is intended to receive the pipe T in an interposed manner; when fully inserted, such a pipe is interposed between the first tubular element and the bushing. The bushing has an inner surface 11a and an outer surface 11b, the inner surface 11a being directed towards the first tubular element.

Preferably, the first tubular element 3 has an external surface 6 and an internal surface 7, the external surface 6 being directed towards the first bush 11 and the internal surface 7 being directed towards and defining the first conduit 3 b.

Preferably, the first bush 11 is configured for operating at least in an insertion configuration, in which the first bush 11 allows the pipe T to be inserted into the annular housing 12, and in a clamping configuration, in which the first bush 11 presses and stably locks the pipe in the annular housing in a fluid-tight manner.

In more detail, the transition of the first bush 11 from the insertion configuration (fig. 9) to the clamping configuration (fig. 11) takes place by means of radial deformation of the bush 11 itself, so that the bush 11 approaches the first tubular element 3, compressing the conduit T between the bush and the first tubular element inside the annular housing 12. This deformation is achieved by the action of a gripping profile P1 of a gripping gripper P (visible in fig. 10) on the outer surface 11b of the bush, which enables the bush to be plastically deformed. In other words, the transition of the bush 11 to the gripping configuration determines a reduction of the radial extension of the annular housing 12, caused by the approach of the bush 11 to the first tubular element 3 and, therefore, the compression of the pipe T inside the annular housing.

The fitting also comprises at least one first bush holder 30, which is externally associated with the first tubular element 3 in such a way that the first bush 11 is positioned around the first tubular element 3 at a certain distance therefrom and defines the aforesaid annular housing 12 and is configured for mounting the first bush 11 on the first tubular element.

Preferably, the first liner retainer 30 includes a sealing portion 31, the sealing portion 31 wrapping around the outside of the sealing section 40 of the first tubular member and contacting the sealing section 40 of the first tubular member.

Preferably, the sealing portion 31 is configured for being interposed between a portion of the pipe T and the sealing section 40 of the first tubular element 3 once the pipe T is inserted in the annular housing 12.

The sealing portion 31 of the first bush holder 30 obtains a fluid-tight gasket, preventing fluid leakage between the first conduit 3b and the exterior of the fitting 1, at least when the first bush is in the aforementioned clamped configuration. In essence, the first bushing retainer itself acts as a sealing element.

It is observed that the technical solution according to the invention firstly consists of having the portion that ensures the hydraulic seal (i.e. the sealing portion 31) structurally integral directly in the bush holder 30, whereas, in the known solutions, the seal is generally constituted, in a known solution, by one or more gaskets that are separated and removed with respect to the bush holder, placed in a specific position of the fitting.

Preferably, when the first bush 11 is in the clamped configuration, the sealing portion 31 of the first bush holder 30 is pressed between the pipe T inserted and pressed in the annular housing 12 and the sealing section 40 of the first tubular element 3.

Preferably, the first bush-holder 30 is associated in a removable manner with the first tubular element 3.

Preferably, the first bush retainer 30 is structurally and functionally interposed between the first bush 11 and the first tubular element 3. This allows the first liner to be correctly mounted on the first tubular member.

Preferably, the first bush holder 30 is associated with a position in which the first tubular element 3 is radially set back and moved away from the end of the first tubular element defining the first inlet/outlet opening 3 a.

Preferably, the first liner retainer 30 includes a hook portion 35, the hook portion 35 being configured for receiving the longitudinal end 11c of the first liner 11 and stably securing the first liner to the first liner retainer 30.

Preferably, the hook portion 35 extends externally and radially away from the sealing portion 31.

Preferably, the first bushing retainer 30 is a one-piece member.

Preferably, the first liner retainer 30 is made of a single piece, i.e. the hook portion 35 and the sealing portion 31 are made of a single piece.

Preferably, the hook portion 35 and the sealing portion 31 are made in a single piece and at the same time the hook portion 35 and the sealing portion 31 are parts separate from each other (from a structural and functional point of view), the hook portion 35 being configured for supporting the first bush 11 and the sealing portion 31 being configured for ensuring a fluid seal on the first tubular element 3.

Preferably, the hook-shaped portion 35 is spaced externally from said first tubular element 3 and is not in contact with said first tubular element 3.

Preferably, the first tubular element 3 comprises a locking section 45 configured for allowing a stable connection of the pipe T inserted in the annular housing 12 when the first bush 11 is in the gripping configuration and preventing the pipe from being extracted from the fitting.

Preferably, the locking section 45 may comprise means for stably anchoring the pipe once it has been inserted in the tubular housing and the first bush has been squeezed in the gripping configuration. Such means may comprise ribs, annular protrusions, protrusions or grooves on the outer surface side of the tubular element forming the locking section, acting as a part for gripping the tube. Such means may also be of the type known in the field of pressure fittings.

Preferably, the sealing portion 31 of the first bush holder 30 corresponds functionally to a gasket or O-ring, and no further sealing element is required for the sealing fixation of the conduit T to the first tubular element 3.

Preferably, the sealing portion 31 has an annular shape or a ring shape or a hollow cylindrical shape or a band shape.

Preferably, the locking section 45 has a cylindrical shape and the sealing section 40 has a corresponding cylindrical shape.

Preferably, the first tubular element 3 has a substantially hollow cylindrical shape with a first longitudinal extension axis X.

Preferably, the material constituting the first tubular element has a substantially constant cross-section (or thickness).

Preferably, the locking section 45 and the sealing section 40 are arranged in succession one after the other along a direction coinciding with the first longitudinally extending axis X.

Preferably, the sealing section 40 is defined by and occupies a longitudinal portion of the outer surface 6 of the first tubular element 3.

Preferably, the locking section 45 is defined by and occupies a respective longitudinal portion of the outer surface 6 of the first tubular element 3.

Preferably, the locking section 45 extends from the first inlet/outlet opening 3a, and the sealing section 40 is positioned downstream (with respect to the first inlet/outlet opening) of the locking section along the first longitudinal extension axis X.

Preferably, the sealing section 40 is positioned on the opposite side of the locking section 45 with respect to the side on which the first inlet/outlet opening 3a is located. In other words, the locking section 45 is interposed along the longitudinal extension between the first inlet/outlet opening 3a and the sealing section 40.

Preferably, the locking section 45 terminates at the first inlet/outlet opening 3a or opens into the first inlet/outlet opening 3 a.

Preferably, the locking section 45 and the sealing section 40 are one after the other in the first tubular element 3 and extend continuously with respect to each other to form a single first tubular element.

Preferably, the sealing portion 31 of the liner retainer 30 has a preferably constant outer diameter and thickness.

Preferably, the locking section 45 has a first diameter on the outer surface 6 of the first tubular element and the sealing section 40 has a second diameter on the outer surface 6 of the first tubular element, the second diameter being smaller than the first diameter by an amount substantially equal to the thickness of the sealing portion 31 of the liner retainer 30. In this way, the sealing portion 31 externally wound around the first tubular element 3 is substantially flush with the outer surface of the locking section 45, in which case the outer diameter of the sealing portion substantially coincides with (or is slightly smaller than) the aforementioned first diameter.

In other words, since the sealing portion 31 of the bush holder 30 is wound on a diameter (the aforementioned second diameter of the sealing section 40) which is small with respect to the diameter of the locking section 45 of the tubular element (i.e. the sealing portion 31 moves close to the longitudinally extending axis X), an approximately constant diameter (i.e. the aforementioned first diameter) can be obtained inside the annular housing 12, free to receive the pipe T in an inserted manner.

Preferably, the sealing section 40 of the first tubular element 3, having the aforementioned second diameter smaller than the first diameter, obtains an annular seat 42 housing the sealing portion 31 of the first bush holder 30.

Preferably, the sealing portion 31 of the first bush retainer 30 inserted in the annular seat 42 of the sealing section 40 of the first tubular element 3 determines the mounting of the first bush retainer 30 on the first tubular element 3 and the mounting of the first bush 11 with the first bush retainer 30 on the first tubular element 3.

In an alternative embodiment, the sealing portion 31 may have an outer diameter greater than the diameter as follows: the sealing portion 31 projects outwardly from the outer surface 6 of the locking section 45 of the first tubular element 3. Such an embodiment is capable of providing a fluid seal after the conduit T has been simply inserted in the annular housing 12; in addition, the sealing portion 31 can then be further deformed together with the pipe itself after the bushing has been squeezed in as follows: adheres with greater effectiveness to the tubular element and to the duct cooperating with the tubular element, preventing the fluid from leaking towards the outside even under high operating pressure conditions.

Preferably, the aforementioned diameter is referenced to the first longitudinal extension axis X.

Preferably, the first bush 11 has an internal diameter on its internal surface 11a in the insertion configuration, and the difference between the value of such internal diameter of the bush and the value of the aforesaid first diameter of the locking section 45 (i.e. the aforesaid specific distance of the first bush 11 from the first tubular element 3) corresponds to the radial extension of the annular housing 12 and allows at least the insertion of the pipe T to be fitted, for example substantially equal to the thickness of the pipe.

Preferably, the first bushing holder 30 and the first bushing 11 mounted on the first bushing holder 30 are integrated with each other.

Preferably, the first bush retainer 30 is freely rotatable about the first tubular element 3 with respect to the first longitudinally extending axis X, the first bush retainer 30 being externally associated with the first tubular element 3 and carrying the first bush 11 mounted on the first bush retainer 30.

Preferably, the bush retainer is made of rubber or plastics material.

For example, the rubber may be EPDM, an ethylene-propylene diene monomer synthetic rubber.

Preferably, the bushing retainer 30 is made of a single piece and is made of a single material. Preferably, the bushing-holder 30 is made by means of molding.

Preferably, at least the sealing portion 31 of the first liner retainer 30, or more preferably the entire first liner retainer 30, is made of a material adapted to maintain elastic or plastic deformation after the transition of the first liner from the insertion configuration to the clamping configuration in such a way as to determine the locking of the pipe in the annular housing in a fluid-tight manner. This variation is illustrated as an example in fig. 12.

Preferably, the first bushing 11 is made of a metallic material, for example steel (for example stainless steel AISI 304). Alternatively, the first bushing 11 may be made of brass or aluminum or a metal alloy. In another alternative, the first bushing may be made of a deformable plastic.

Preferably, the sealing portion 31 and the hook portion 35 of the first liner retainer are joined together at the intermediate section 38 to form a single liner retainer.

Preferably, the sealing portion 31 and the hook portion 35 extend on opposite sides with respect to such an intermediate section 38 and are functionally separated from the intermediate section 38.

Preferably, the intermediate section 38 is shared between and connects the sealing portion 31 and the hook portion 35.

Preferably, the first liner retainer 30 extends continuously from one free end 32 of the sealing portion 31 up to the respective free end 36 of the hook portion 35. The free ends 32, 36 of the sealing portion and the hook portion have an annular or rounded shape and are radially displaced away from the opposite side of the annular housing 12. The respective ends of the sealing portion and the hook portion, each opposite the respective free end 32 or 36, coincide in said intermediate section 38.

Preferably, the first bush retainer 30 has an overall C-or U-shaped cross section in a half plane through the longitudinal extension axis X, wherein the free ends of the sealing portion and the hook-shaped portion are directed towards the first inlet/outlet opening 3a of the first tubular element 3.

Preferably, as shown by way of example in the figures, the sealing portion 31 has a tubular shape.

Preferably, the hook-shaped portion 35 extends from the rear end of the sealing portion (opposite to the free end 32) towards the outside, moves away from the sealing portion at least up to the diameter of the bushing, and is locally bent towards the sealing portion, externally surrounding it, maintaining the necessary distance to define the annular housing 12. Preferably, the free end portion (32 or 36) is advanced towards the first inlet/outlet opening of the first tubular element, while the rear end portion is retracted with respect to the first inlet/outlet opening of the first tubular element.

Preferably, the second end 11d of the first bush 11 terminates in a substantially axial alignment with the open end of the first tubular element (coinciding with the first inlet/outlet opening 3a), said end defining, in concentric circumferential form, a passage into the first annular housing 12 between the second end 11d and the open end of the first tubular element (see for example fig. 3).

Preferably, the sealing section 40 occupies a longitudinal portion of the first tubular element 3 having an extension equal to at least 1/10, or at least 1/5, or at least 1/4, or at least 1/3, or about half of the entire longitudinal extension of the first tubular element.

Preferably, the first bush retainer 30 and the first bush 11 mounted on the first bush retainer 30 are integral with each other and form a single assembly under suitable use conditions.

Preferably, the first bush 11 extends along a longitudinal extension axis X between a first end 11c, intended to be mounted on the first bush holder 30, and a second end 11d, opposite the first, free and defining an opening for inserting the pipe T into the annular casing 12. The first end 11c of the liner 11 is associated with the hook portion 35 of the first liner retainer 30. The second end portion 11d preferably includes an entrance (e.g., flared toward the exterior) to facilitate insertion of the end of the pipe T to be assembled.

Preferably, the first bushing retainer 30 is separate from the first bushing 11.

Preferably, the first end 11c of the first bush 11 has a mounting element (for example a folded lip) configured for insertion in a mounting seat 37 (for example in the form of a slot) of the hook-shaped portion 35 of the bush retainer 30, to determine the assembly of the bush 11 with the bush retainer.

Alternatively, the assembly formed by the first bush retainer 30 and the first bush 11 is made by means of a co-moulding operation of the first bush retainer directly with the first bush, in such a way that the first bush retainer 30 is integral with the first bush 11. Preferably, this co-moulding operation enables a fixed or removable mounting of the first bush on the first bush retainer (i.e. the first bush and the first bush retainer do not require additional mounting means).

Preferably, in the aforementioned co-moulding operation, the bush retainer is made of a first material, for example a first plastics material, and the first bush is made of a second material, for example a second plastics material or a metal material.

Preferably, the bush-holder 30 has an annular shape as a whole and, when the bush-holder 30 is associated with the first tubular element 3, the bush-holder 30 has a central axis coinciding with the longitudinal extension axis X. Preferably, the bush holder 30 has overall a shape of a solid of revolution with respect to the longitudinal extension axis X (see in particular fig. 6 to 8).

Preferably, the liner retainer 30 includes one or more openings 18 made at one or more circumferential locations of the liner retainer and passing between the exterior and the interior of the liner retainer; such an opening (generally defining a "window" around the liner retainer) is adapted to allow viewing of the pipe T inserted in the housing 12 (from outside the liner) to verify proper positioning of the pipe in the fitting prior to clamping of the pipe T.

As shown by way of example in the figures, the fitting 1 may comprise a second bush retainer 60, for example identical to the first bush retainer 30, intended for the second bush 51 and for the second tubular element 4.

Preferably, with the pipe T inserted in the annular housing 12 and with the bush 11 in the clamped configuration, the locking section 45 effects a mechanical sealing of the pipe with the fitting and the sealing section 40 effects a hydraulic sealing.

Preferably, the sealing portion 31 of the first liner retainer 30 is deformable when the first liner 11 is in the clamped configuration to prevent fluid communication between the first conduit 3b and the outer surface of the first tubular element.

Preferably, when the first bush 11 enters the gripping configuration, the first bush 11 is then plastically deformed, the hook portion 35 remaining unchanged, while the sealing portion 31 undergoes a deformation which, depending on the material constituting the bush holder, may be of the elastic type or of the plastic type. See, for example, as shown in the example in fig. 12.

As shown in the example in the figures, the fitting preferably comprises a second bush 51 associated with the second tubular element 4, in such a way that the second bush 51 externally surrounds the second tubular element 4 and forms, between the bush 51 itself and the second tubular element, a respective annular housing intended to receive, in an interposed manner, a respective pipe interposed between the second tubular element and the second bush. The second bush 51 has an external surface 51b and an internal surface 51a directed towards the second tubular element 4, and the second tubular element 4 has a corresponding external surface directed towards the second bush and a corresponding internal surface directed towards the second conduit 4b and defining the second conduit 4 b.

The second bush 51 is configured for operating at least in an insertion configuration, in which the second bush 51 allows the insertion of the respective pipe into the respective annular housing, and in a clamping configuration; and in the clamped configuration, the second bush 51 presses and locks stably the respective tube in the annular housing in a fluid-tight manner.

Preferably, the second bush 51 is identical to the first bush 11 and/or is provided with one or more of the features described in the aspects related to the first bush 11 and/or in the claims.

Advantageously, the diameter of the first tubular element and the diameter of the second tubular element may be equal or different from each other, as may the diameter of the first bush and the diameter of the second bush, depending on the destination of the fitting. In the embodiment of the figures, the diameters of the two tubular elements are shown as being equal to each other, by way of example.

Preferably, as in the embodiment illustrated by way of example in the accompanying figures, the fitting 1 has a linear shape and the first tubular element 3 has a longitudinal extension axis X coinciding with the respective longitudinal extension axis Y of the second tubular element 4.

In a possible alternative embodiment, not shown, the fitting may have a curved or angled shape, in which the respective longitudinal extension axis X of the first tubular element 3 and the respective longitudinal extension axis Y of the second tubular element 4 form an angle between the longitudinal extension axes X and Y different from 180 °, for example 45 ° or 90 °. In such a configuration, the first and second longitudinally extending axes are curved relative to each other and may intersect within the fitting, in a transition portion between the first and second tubular elements of the fitting, or outside the body of the fitting.

In a possible embodiment, the fitting may have a "T" shape and comprise three tubular elements, two outer tubular elements of which are aligned with each other and a third intermediate tubular element interposed between and perpendicular to the two outer tubular elements.

Preferably, the first tubular element 3 and the second tubular element 4 are made of a single piece.

In a possible embodiment, as shown by way of example in the accompanying figures, the locking section 45 may comprise one or more through openings 20 as means for anchoring and stably locking the pipe to the first tubular element 3.

According to such an embodiment, the first tubular element 3 may be provided with at least one through opening 20 between the outer surface 6 and the inner surface 7 of the first tubular element 3. Wherein "through opening" generally refers to a recess or hole, window or groove or gap in the first tubular element 3: the opening may have a shape and size that can vary depending on the embodiment, the size of the fitting, and the destination of use, and the opening passes from the outside of the tubular element to the inside of the tubular element.

The through openings 20 define respective empty spaces between the external surface 6 and the internal surface 7 of the first tubular element 3. Wherein the term empty space is intended to mean that no material is present in the first tubular element, i.e. an "empty" or removed first tubular element; in fact, the empty space created by the through opening defines a seat intended to be filled by the material belonging to the pipe T to be connected by means of the fitting.

In the gripping configuration, the empty space defined by the through opening 20 is configured for being occupied by a portion of the pipe T pressed on the first tubular element 3 (in particular due to the pressure of the first bush 11 on the first tubular element 3).

Preferably, the aforementioned empty spaces are free of the material constituting the first tubular element 3, at least at the section of the first tubular element. Thus, the seat defined by the empty space is considered at least in the section or thickness of the first tubular element 3.

The fitting of the invention, as shown by way of example in the accompanying drawings, when provided with a space in which the through opening is provided empty, is provided with effective means for anchoring the pipe once pressed. The presence of the bush allows the operation of connecting the pipe to the fitting to be optimized, since the plastic deformation of the bush (due to the compression of the gripper P) determines the pressure on the pipe, what then occurs is the compression of the pipe in the annular housing and the infiltration of the material of the pipe into the empty spaces, and additionally this pressure is maintained over time, thus also preventing the pipe from being extracted over a certain time distance.

In the embodiment shown by way of example in the figures, said at least one through opening 20 is made by means of cutting and removing the material forming the first tubular element 3.

Preferably, the through opening has a specific closed polygonal shape, such as rectangular, circular, square, triangular.

Preferably, the through opening has an edge 22 corresponding to a particular closed polygonal shape.

Preferably, the empty space defined by the through opening 20 corresponds to a section portion of the first tubular element 3 from which material has been removed by means of a cut forming the through opening.

Preferably, said at least one through opening is made by means of an operation of cutting and removing the material forming the first tubular element. As an example, the cutting and removal of the material is performed by means of a cutting or punching operation, or laser cutting, water cutting, plasma cutting, cold cutting, flame cutting.

As an example, the plurality of through openings may comprise sets of through openings alongside one another in such a way that the sets of through openings occupy a cylindrical portion of the outer surface of the first tubular element. In such a set of through openings, the through openings may be offset from each other to form a checkerboard distribution or a grid of through openings.

In a possible embodiment not shown, the sealing portion may also be provided with one or more of said through openings placed below the sealing element.

The second tubular element 4 can also be provided with at least one respective through opening 20 between an external surface of the second tubular element directed towards the second bush 51 and an internal surface of the second tubular element directed towards and defining said second conduit 4 b. The respective through openings 20 define respective empty spaces between the external surface and the internal surface of the second tubular element 4. In the clamping configuration, the empty space defined by the respective through opening 20 is configured for being occupied by a portion of the respective conduit pressed between the second bush 51 and the second tubular element 4.

Preferably, the second tubular element 4 is structurally identical to the first tubular element 3 and/or is provided with one or more of the features described in relation to the first tubular element and/or in the claims.

Preferably, the first tubular element 3 and the second tubular element 4 realize a fitting 1 for connecting two pipes, wherein the means present on the first tubular element are present in a completely mirrored manner or respectively also on the second tubular element.

Preferably, the first tubular element 3 and the second tubular element 4 are made of a single piece.

Preferably, the fitting 1 is made of a single piece, except for the first bush 11, the second bush 51, the first bush holder 30 and the second bush holder 60.

As an alternative to the mirror image shape of the first and second tubular elements, in a possible embodiment (not shown) the second tubular element comprises a device for connection to a fluid source, such as a conduit, a tap or a water tank. Preferably, said connection means comprise a threaded portion intended to be connected to a corresponding counter-thread of said fluid source to place said second tubular element in fluid communication with said fluid source.

Preferably, in a possible embodiment of the invention (not shown), the fitting comprises a plurality of tubular elements in fluid communication with each other, on each of which a respective duct can be fitted, each tubular element preferably being identical to the above-mentioned first or second tubular element.

Preferably, the first tubular element 3 and/or the second tubular element 4 are made of a metallic material, preferably steel or brass (for example brass alloy CW617N), or of a plastic material (for example PPSU-technology polymer).

As an example, the first tubular element 3 and the second tubular element 4 are made by means of steel pipes having a thickness of about 1mm or comprised between 0.5mm and 1.5 mm.

The fitting object of the present invention complies with the laws of drinking water use. As an example, the maximum operating temperature in continuous operation may be 150 ℃ and the maximum working pressure may be 10 bar.

The bushing 11 and the bushing 51 according to the invention are configured to be clamped by means of a clamp having a B-or F-or H-or TH-or U-shaped clamping profile or another profile, with reference to the clamping standards of fittings known in the hydraulic industry. In fact, the bushing is shaped in the following way: so that the deformation of each of such clamps is of the correct size, i.e. neither insufficient (if sealing problems are verified) nor excessive (if the pipe is damaged).

The invention thus conceived is susceptible of numerous modifications and variations, all falling within the scope of the inventive concept, and the components described above may be replaced by other technically equivalent elements.

The invention achieves important advantages. First of all, as is apparent from the above description, the present invention allows overcoming at least some of the drawbacks of the prior art.

In more detail, the above-described fitting, featuring a bush holder integral with the sealing portion in which the fluid-tight gasket is realised, allows to simplify the realisation and assembly of the fitting itself.

This translates into lower manufacturing costs of the fitting, into reduced assembly time of the fitting and into simplified installation operations. In addition, the sealing portion made directly in the bush holder allows to obtain a more effective and safer fluid seal, thus increasing the reliability of the fitting when in use.

Additionally, the bush holder provided with a sealing portion allows to prevent possible problems that may occur in the known figures due to incorrect or unstable gasket positioning that may lead to fluid leakage.

The fitting according to the invention is characterized by a high and constant performance even after long installation times and in the case of high operating pressures.

The fitting according to the invention is provided with innovative means, in particular a bush holder in a single piece integral with the sealing element, capable of ensuring an effective hydraulic seal once the flexible pipe is inserted and pressed in the fitting.

The fitting according to the invention is characterized by reduced costs, in particular compared to the costs of the known solutions, while ensuring the necessary performance and correct connection of the pipe to the fitting.

Overall, the fitting of the invention is characterized by high operational reliability and by a low tendency to failure or malfunction.

The fitting, object of the present invention, advantageously enables the use of a plurality of clamping grippers. Finally, the fitting according to the invention is characterized by a simple and rational structure.