阅读说明：本技术 一种用于金属管件的抗拉增强连接方法 (Tensile reinforcement connection method for metal pipe fitting ) 是由 李伟松 李继平 于 2020-12-25 设计创作，主要内容包括：本发明公开了一种用于金属管件的抗拉增强连接方法,用于金属管材与金属连接管之间的密封连接,取一段外径与金属管材内径相匹配的金属短管,对该短管的一端部进行扩口形成一具有大小两种口径的中间增强管,该中间增强管的中部因扩口形成有台阶位；所述金属连接管的端口内径大于所述金属管材的外径,所述中间增强管扩口一端的外径与金属连接管的内径相匹配。本发明采用扩口结构的中间增强管,可实现三管管壁压合锁止,又利用中间增强管扩口台阶位实现其于金属连接管的限位锁止,这种连接方法相较于双壁压合大大增强了抗拉强度,尤其是结构简单,各管材都十分容易通过扩口方式加工,极大的降低了加工成本,大幅提升了金属管道的连接施工效率。(The invention discloses a tensile reinforcement connection method for a metal pipe fitting, which is used for the sealed connection between a metal pipe and a metal connecting pipe, wherein a section of metal short pipe with the outer diameter matched with the inner diameter of the metal pipe is taken, one end part of the short pipe is flared to form a middle reinforcement pipe with two calibers, and the middle part of the middle reinforcement pipe is provided with a step position due to flaring; the inner diameter of the port of the metal connecting pipe is larger than the outer diameter of the metal pipe, and the outer diameter of the flaring end of the middle reinforcing pipe is matched with the inner diameter of the metal connecting pipe. The middle reinforced pipe with the flaring structure is adopted, the pressing and locking of the pipe walls of the three pipes can be realized, and the limiting and locking of the middle reinforced pipe on the metal connecting pipe can be realized by utilizing the flaring step position of the middle reinforced pipe.)

1. A tensile reinforcement connection method for metal pipes, which is used for sealing connection between a metal pipe (1) and a metal connecting pipe (2), and is characterized in that: taking a section of metal short pipe with the outer diameter matched with the inner diameter of the metal pipe (1), flaring one end of the short pipe to form a middle reinforced pipe (3) with two calibers, wherein a step (31) is formed in the middle of the middle reinforced pipe due to flaring; the inner diameter of the port of the metal connecting pipe (2) is larger than the outer diameter of the metal pipe (1), and the outer diameter of one end of the flaring of the middle reinforcing pipe (3) is matched with the inner diameter of the metal connecting pipe (2);

during connection, one end of the middle reinforcing pipe (3) which is not flared is coated with adhesive and then inserted into the metal pipe (1) until reaching the step position (31); inserting one end of the flaring of the middle reinforcing pipe (3) from the port of the metal connecting pipe (2) until the port of the metal connecting pipe (2) is positioned at the pipe section where the metal pipe (1) is combined with the middle reinforcing pipe (3);

after the insertion step is completed, injecting bonding glue into a cavity formed by the outer wall of the metal connecting pipe (2) and the inner wall of the metal pipe (1) or sleeving a sealing ring, then carrying out necking lamination on the position, located at the step position (31) of the middle reinforced pipe, of the metal connecting pipe (2) by using a pipe pressing device, enabling the metal connecting pipe (2) and the middle reinforced pipe (3) to be locked at the step position in a limiting manner, meanwhile, carrying out necking lamination on the port of the metal connecting pipe (2), and enabling the metal connecting pipe (2), the metal pipe (1) and the middle reinforced pipe (3) to be locked by three pipe wall lamination.

2. The tensile-reinforced joining method according to claim 1, wherein: after one end, which is not flared, of the middle reinforcing pipe (3) is coated with glue and then inserted into the metal pipe (1) until reaching the step position (31), a pipe pressing device is firstly used for pressing the pipe section formed by combining the metal pipe (1) and the middle reinforcing pipe (3), and then the flared end of the middle reinforcing pipe (3) is inserted from the port of the metal connecting pipe (2).

3. A method of tensile-reinforced joining according to claim 1 or 2, characterized in that: the inner diameter of the middle section of the metal connecting pipe (2) is smaller than the inner diameter of the end part of the metal connecting pipe and smaller than the outer diameter of one end of the flaring of the middle reinforcing pipe (3), a contraction step (21) of the metal connecting pipe (2) is formed at the position where the inner diameter is reduced, and the distance from the port of the metal connecting pipe to the contraction step is smaller than the pipe length of the middle reinforcing pipe (3); one end of the middle reinforcing pipe (3) which is flared is inserted from the end of the metal connecting pipe (2) until the middle reinforcing pipe is propped against the contraction step (21).

Technical Field

The invention relates to the technical field of pipe connection, in particular to a tensile reinforcement connection method for a metal pipe.

Background

The pipe fitting is a general name of parts in a pipeline system which play roles in connection, control, direction change, flow distribution, sealing, supporting and the like. The plastic pipe fitting and the metal pipe fitting are generally divided according to the material, wherein the metal pipe fitting has the characteristics of firmness, durability, strong corrosion resistance and long service life compared with the plastic pipe fitting.

The metal pipeline connection mode adopted at present at home mainly comprises compression type, welding type connection and the like, wherein the compression type connection is ring pressure type connection and clamping pressure type connection, the ring pressure type connection and the clamping pressure type connection both belong to mechanical connection, and the connection mode adopts a special clamping pressure machine to carry out hydraulic deformation sealing on the connection part of a metal pipe fitting and a pipe. Because the compression joint part is generally a single-layer hollow pipe, the compression joint part has low strength and insufficient drawing force due to the connection mode, the middle part of the sealing ring is easy to have a hollowing phenomenon, the sealing performance is poor, and particularly, the rubber ring has a large caliber and is easy to extrude to cause water leakage; therefore, the connection mode has the defects of inconvenient maintenance and high maintenance cost, and the construction is inconvenient.

Disclosure of Invention

In view of the above problems, the present invention is directed to providing a tensile reinforcement connection method for metal pipes, which can reduce the processing cost and improve the construction efficiency.

In order to realize the technical purpose, the scheme of the invention is as follows: a tensile reinforcement connection method for a metal pipe fitting is used for sealing connection between a metal pipe fitting and a metal connecting pipe, a section of metal short pipe with the outer diameter matched with the inner diameter of the metal pipe fitting is taken, one end part of the short pipe is flared to form a middle reinforcement pipe with two different calibers, and a step position is formed in the middle of the middle reinforcement pipe due to flaring; the inner diameter of the port of the metal connecting pipe is larger than the outer diameter of the metal pipe, and the outer diameter of the flaring end of the middle reinforcing pipe is matched with the inner diameter of the metal connecting pipe;

during connection, one end of the middle reinforcing pipe, which is not flared, is coated with adhesive and then inserted into the metal pipe until reaching the step position; inserting one end of the flaring of the middle reinforcing pipe from the port of the metal connecting pipe until the port of the metal connecting pipe is positioned at the pipe section where the metal pipe and the middle reinforcing pipe are combined;

after the insertion step is completed, adhesive glue is injected into a cavity formed by the outer wall of the metal connecting pipe and the inner wall of the metal pipe or a sealing ring is sleeved in the cavity, then, a pipe pressing device is used for carrying out necking stitching on the position, located at the step position, of the middle reinforcing pipe, of the metal connecting pipe, so that the metal connecting pipe and the middle reinforcing pipe are limited and locked at the step position, meanwhile, the port of the metal connecting pipe is also subjected to necking stitching, and the metal connecting pipe, the metal pipe and the three pipe walls of the middle reinforcing pipe are stitched and locked.

Preferably, after the end of the middle reinforcing pipe, which is not flared, is coated with the adhesive and then inserted into the metal pipe material until reaching the step position, the pipe section formed by combining the metal pipe material and the middle reinforcing pipe is pressed by a pipe pressing device, and then the flared end of the middle reinforcing pipe is inserted from the port of the metal connecting pipe.

Preferably, the inner diameter of the middle section of the metal connecting pipe is smaller than the inner diameter of the end part of the metal connecting pipe and smaller than the outer diameter of one end of the flaring of the middle reinforcing pipe, the contracted part of the inner diameter forms a contracted step of the metal connecting pipe, and the distance from the port of the metal connecting pipe to the contracted step is smaller than the pipe length of the middle reinforcing pipe; one end of the flaring of the middle reinforced pipe is inserted from the port of the metal connecting pipe until the flaring of the middle reinforced pipe is stopped by the contraction step.

The invention has the beneficial effects that: the middle reinforcing pipe adopting the flaring structure is additionally arranged when the metal pipe is connected with the metal connecting pipe, the pressing locking of the metal connecting pipe, the metal pipe and the pipe wall of the middle reinforcing pipe can be realized, the limiting locking of the middle reinforcing pipe on the metal connecting pipe can be realized by utilizing the flaring step position of the middle reinforcing pipe, the connecting method greatly enhances the tensile strength compared with double-wall pressing, and particularly has simple structure, each pipe is very easy to be processed by a flaring mode, the processing cost is greatly reduced, the construction is extremely simple, and the connection construction efficiency of the metal pipe is greatly improved.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention when unconnected;

FIG. 2 is a schematic diagram of a connection according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a second embodiment of the present invention when unconnected;

fig. 4 is a schematic structural diagram of the second embodiment of the present invention during connection.

1. A metal pipe; 2. a metal connecting pipe; 21. a contracting step; 3. a middle reinforcement tube; 31. a step position.

Detailed Description

The invention is described in further detail below with reference to the figures and specific embodiments.

The invention relates to a tensile reinforcement connection method for a metal pipe fitting, which is used for sealing tensile connection between a metal pipe 1 and a metal connecting pipe 2, the common method is that the metal pipe 1 and the metal connecting pipe 2 are connected and pressed, the pressed connection is only double-wall connection, and the resistance to pulling caused by pressing is not strong enough under special conditions, so the scheme provides a middle reinforcement pipe 3 which can be used for enhancing the connection strength and the sealing performance between the metal pipe 1 and the metal connecting pipe 2, and avoids the problems, and the manufacturing method of the middle reinforcement pipe 3 comprises the following steps: a metal short pipe with the outer diameter matched with the inner diameter of the metal pipe 1 is taken, one end of the short pipe is flared to form a middle reinforced pipe 3 with two calibers, a step 31 is formed in the middle of the middle reinforced pipe due to flaring, the step 31 is a high-low step formed at the flaring position, and the left and right calibers at the position are different. The middle reinforced pipe is made of metal or alloy, and particularly stainless steel or other metal materials can be used.

In order to meet the connection requirement, the inner diameter of the port of the metal connecting pipe 2 is larger than the outer diameter of the metal pipe 1, so that the metal pipe 1 has enough space to enter the metal connecting pipe, and the outer diameter of one end of the flaring of the middle reinforcing pipe 3 is matched with the inner diameter of the metal connecting pipe 2.

In the first embodiment of the present invention, as shown in fig. 1-2, during connection, one end of the middle reinforcing pipe 3, which is not flared, is coated with an adhesive and then inserted into the metal pipe 1 until reaching the step 31 (i.e., the metal pipe 1 is stopped by the step 31); middle reinforcing pipe 3 passes through the viscose bonding with metal tubular product 1 and seals, and the step position 31 of middle reinforcing pipe 3 carries on spacingly to metal tubular product 1, and the junction between them forms double-walled structure before the step position, owing to have inside middle reinforcing pipe 3 to the support of metal tubular product 1, avoids metal tubular product tip pressurized deformation, increases the intensity of structure.

Inserting one end of the flaring of the middle reinforcing pipe 3 from the port of the metal connecting pipe 2 until the port of the metal connecting pipe 2 is positioned at the pipe section where the metal pipe 1 and the middle reinforcing pipe 3 are combined (namely, positioned between the two combined parts to form a double-wall structure); at this time, the double-layer structure formed between the metal pipe 1 and the middle reinforcing pipe 3 completely enters the end part of the metal connecting pipe 2, and a three-layer pipe wall structure is formed between the step position 31 and the end port of the middle reinforcing pipe which is not flared.

After the insertion step is completed, adhesive glue is injected into a cavity formed by the outer wall of the metal connecting pipe 2 and the inner wall of the metal pipe 1 or a sealing ring is sleeved (waterproof sealing is ensured), then, a pipe pressing device is used for carrying out necking stitching on the position, located at the middle reinforcing pipe step 31, of the metal connecting pipe 2, so that the metal connecting pipe 2 and the middle reinforcing pipe 3 are locked at the step position in a limiting manner, meanwhile, the port of the metal connecting pipe 2 is also subjected to necking stitching, and the metal connecting pipe 2, the metal pipe 1 and the middle reinforcing pipe 3 are locked in a pipe wall stitching manner. When the pipe is pressed, a clamping or ring pressing tool can be adopted to lock the port of the metal connecting pipe 2 and the position of the metal connecting pipe 2 at the step position of the middle reinforced pipe, and the pipe is pressed according to the specified pressure, and the selected pressure is the common general knowledge in the field for the pipes with different pipe diameters.

In order to improve the on-site construction efficiency, after the end of the middle reinforcing pipe 3, which is not flared, is coated with an adhesive and then inserted into the metal pipe 1 until reaching the step 31, the pipe section, in which the metal pipe 1 and the middle reinforcing pipe 3 are combined, is pressed by a pipe pressing device, and then the flared end of the middle reinforcing pipe 3 is inserted from the port of the metal connecting pipe 2. The method presses the pipe section combined by the metal pipe 1 and the middle reinforcing pipe 3 in advance, is beneficial to on-site construction and assembly in advance, improves the efficiency, and after pressing, the two sections of metal pipes are connected by the metal connecting pipe to complete the subsequent pressing operation.

In the second embodiment of the present invention, as shown in fig. 3-4, a top stop is formed on the metal connecting pipe 2 to facilitate the assembly in the field construction and increase the connection stability. The inner diameter of the middle section of the metal connecting pipe 2 is smaller than the inner diameter of the end part of the metal connecting pipe and smaller than the outer diameter of one end of the flaring end of the middle reinforcing pipe 3, the shrinking part of the inner diameter forms a shrinking step 21 of the metal connecting pipe 2, and the distance from the port of the metal connecting pipe to the shrinking step is smaller than the pipe length of the middle reinforcing pipe 3; the flared end of the intermediate reinforcing tube 3 is inserted from the end of the metal connecting tube 2 until it is stopped by said constriction step 21.

During connection, the end, which is not flared, of the middle reinforcing pipe 3 is coated with adhesive and then inserted into the metal pipe 1 until reaching the step position 31; and then inserting the flared end of the middle reinforcing pipe 3 from the end of the metal connecting pipe 2 until the flared end of the middle reinforcing pipe 3 is stopped by the contraction step 21. After the insertion step is completed, injecting bonding glue into a cavity formed by the outer wall of the metal connecting pipe 2 and the inner wall of the metal pipe 1 or sleeving a sealing ring, then carrying out necking lamination on the position, located at the step position 31 of the middle reinforcing pipe, of the metal connecting pipe 2 by using a pipe pressing device, enabling the metal connecting pipe 2 and the middle reinforcing pipe 3 to be locked at the step position in a limiting manner, meanwhile, carrying out necking lamination on the port of the metal connecting pipe 2, and enabling the metal connecting pipe 2, the metal pipe 1 and the middle reinforcing pipe 3 to be locked in a pipe wall laminating manner.

In order to improve the on-site construction efficiency, after the end of the middle reinforcing pipe 3, which is not flared, is coated with an adhesive and then inserted into the metal pipe 1 until reaching the step 31, the pipe section, in which the metal pipe 1 and the middle reinforcing pipe 3 are combined, is pressed by a pipe pressing device, and then the flared end of the middle reinforcing pipe 3 is inserted from the port of the metal connecting pipe 2. The method presses the pipe section combined by the metal pipe 1 and the middle reinforcing pipe 3 in advance, is beneficial to on-site construction and assembly in advance, improves the efficiency, and after pressing, the two sections of metal pipes are connected by the metal connecting pipe to complete the subsequent pressing operation.

This embodiment has increased the preparation scheme of shrink step, though has increased the process, but further improves the stability of connecting, and the distance of metal connecting pipe port to this shrink step is less than the pipe length of middle reinforcing pipe 3 can avoid pushing into middle reinforcing pipe too much when inserting metal tubular product 1, causes metal connecting pipe 2 and metal tubular product 1 can't be connected or connect badly, plays limiting displacement, reduces the tubular product and connects the degree of difficulty.

The middle reinforcing pipe adopting the flaring structure is additionally arranged when the metal pipe is connected with the metal connecting pipe, the pressing locking of the metal connecting pipe, the metal pipe and the pipe wall of the middle reinforcing pipe can be realized, the limiting locking of the middle reinforcing pipe on the metal connecting pipe can be realized by utilizing the flaring step position of the middle reinforcing pipe, the connecting method greatly enhances the tensile strength compared with double-wall pressing, and particularly has simple structure, each pipe is very easy to be processed by a flaring mode, the processing cost is greatly reduced, the construction is extremely simple, and the connection construction efficiency of the metal pipe is greatly improved.

The scheme provides a connecting method for metal pipe fittings, when metal pipes and metal connecting pipes are connected, middle reinforcing pipes adopting flaring structures are additionally arranged, pressing locking of the metal connecting pipes, the metal pipes and the middle reinforcing pipes can be realized, and limiting locking of the metal connecting pipes on the metal connecting pipes can be realized by utilizing flaring step positions of the middle reinforcing pipes.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any minor modifications, equivalent replacements and improvements made to the above embodiment according to the technical spirit of the present invention should be included in the protection scope of the technical solution of the present invention.