阅读说明：本技术 一种高压大口径节能型双板止回阀 (High-pressure large-caliber energy-saving double-plate check valve ) 是由 吴斌彬 杨忠义 杨凯旋 于 2019-09-11 设计创作，主要内容包括：本发明公开了一种高压大口径节能型双板止回阀,包括阀体以及对称安装在阀体内部两侧的固定块,两个固定块底端之间水平安装有第一定位销轴,固定块中间水平安装有第二定位销轴,第一定位销轴上分别安装有相互配合的第一阀瓣和第二阀瓣,第一定位销轴中间安装有第一弹簧组和第二弹簧组,固定块顶部通过锁紧螺栓连接有限位座,阀体内部底端竖直设有密封横梁。本发明解决了现有双板止回阀能耗高、寿命短及易造成管道输送介质震动、紊流、噪声等问题,密封可靠且具有节能降噪功能,结构简单,装配及维修方便,具有优异的物理力学性能,实用性强,值得推广和使用。(The invention discloses a high-pressure large-caliber energy-saving double-plate check valve which comprises a valve body and fixed blocks symmetrically arranged on two sides in the valve body, wherein a first positioning pin shaft is horizontally arranged between the bottom ends of the two fixed blocks, a second positioning pin shaft is horizontally arranged in the middle of the fixed blocks, a first valve clack and a second valve clack which are matched with each other are respectively arranged on the first positioning pin shaft, a first spring group and a second spring group are arranged in the middle of the first positioning pin shaft, the top of each fixed block is connected with a limiting seat through a locking bolt, and a sealing cross beam is vertically arranged at the bottom end in. The double-plate check valve solves the problems that the existing double-plate check valve is high in energy consumption and short in service life, vibration, turbulence, noise and the like of a pipeline conveying medium are easily caused, is reliable in sealing, has the functions of energy conservation and noise reduction, is simple in structure, convenient to assemble and maintain, excellent in physical and mechanical properties and strong in practicability, and is worthy of popularization and use.)

1. The utility model provides an energy-saving double plate check valve of high pressure heavy-calibre which characterized in that: the valve comprises a valve body (1) and fixing blocks (2) symmetrically arranged on two sides in the valve body (1), wherein a first positioning pin shaft (3) is horizontally arranged between the bottom ends of the two fixing blocks (2), a second positioning pin shaft (4) is horizontally arranged in the middle of the fixing blocks (2), a first valve clack (5) and a second valve clack (50) which are matched with each other are respectively arranged on the first positioning pin shaft (3), a first spring group (6) and a second spring group (60) are arranged in the middle of the first positioning pin shaft (3), the top of each fixing block (2) is connected with a limiting seat (7) through a locking bolt (8), and a sealing cross beam (9) is vertically arranged at the bottom end in the valve body;

a first seal cavity (11) is arranged in the valve body (1), the bottom end of the first seal cavity (11) is communicated with a second seal cavity (12), the diameter of the first seal cavity (11) is larger than that of the second seal cavity (12), the first seal cavity (11) is connected with the second seal cavity (12) through an annular seal surface (13), an annular seal bulge (14) is arranged on the inner side of the annular seal surface (13), and a fixed clamping groove (15) for mounting a fixed block (2) is vertically arranged on the inner wall of the first seal cavity (11); strip-shaped sealing bulges (91) are symmetrically arranged on two sides of the top surface of the sealing beam (9);

the first valve clack (5) comprises a first valve seat (51) and first hinged seats (52) symmetrically arranged at two ends of the first valve seat (51), and the first hinged seats (52) are hinged and connected with the first positioning pin shaft (3); first disk seat (51) are including sealing valve plate and set up spacing lug (517) on sealing valve plate surface, sealing valve plate includes vertical distribution's interior plane (511), interior plane (511) both ends are connected with semi-cylindrical surface (512), interior plane (511) and semi-cylindrical surface (512) top are connected with evagination curved surface (513), interior plane (511) bottom inwards bend perpendicularly and form the interior sealed face (514) that supports that links to each other with the sealed protruding (91) contact of bar, semi-cylindrical surface (512) bottom inwards bend perpendicularly and form the outer sealed face (515) that supports of the semicircle annular structure that links to each other with the sealed protruding (14) contact of annular, interior sealed face (514) and outer sealed face (515) of supporting between be connected with indent curved surface (516).

2. The high-pressure large-caliber energy-saving double-plate check valve according to claim 1, characterized in that: an arc-shaped limiting groove (141) is formed in the inner wall of the fixed clamping groove (15), the limiting seat (7) comprises a limiting block (71), and an arc-shaped limiting bulge (72) matched with the arc-shaped limiting groove (141) is arranged at the bottom end of the limiting block (71); the locking bolt (8) penetrates through the limiting block (71) to be in threaded connection with the top end of the fixing block (2).

3. The high-pressure large-caliber energy-saving double-plate check valve according to claim 2, characterized in that: the bottom surface of the limiting block (71) is connected with the top surface of the fixing block (2) in close contact, and a locking pad is arranged between the locking bolt (8) and the limiting block (71).

4. The high-pressure large-caliber energy-saving double-plate check valve according to claim 1, characterized in that: the first spring group (6) comprises two first torsion springs symmetrically arranged in the middle of the first positioning pin shaft (3), and the second spring group (60) comprises two second torsion springs symmetrically arranged in the middle of the first positioning pin shaft (3); one end of the first torsion spring is abutted against the second positioning pin shaft (4), the other end of the first torsion spring is abutted against the first valve clack (5), one end of the second torsion spring is abutted against the second positioning pin shaft (4), and the other end of the second torsion spring is abutted against the second valve clack (50).

5. The high-pressure large-caliber energy-saving double-plate check valve according to claim 1, characterized in that: the second valve clack (50) comprises a second valve seat and second hinged seats symmetrically arranged at two ends of the second valve seat, the second hinged seats are hinged to the first positioning pin shafts (3), and the second valve seat is identical to the first valve seat (51) in structure and distributed in a mirror image mode.

6. The high-pressure large-caliber energy-saving double-plate check valve according to claim 1, characterized in that: and a hoisting hole (518) is formed in the middle of the limiting convex block (517).

7. The high-pressure large-caliber energy-saving double-plate check valve according to claim 1, characterized in that: the inner abutting sealing surface (514) and the outer abutting sealing surface (515) are positioned on the same plane, and an included angle formed by the top surface of the limiting convex block (517) and the inner abutting sealing surface (514) is 5-15 degrees.

Technical Field

The invention belongs to the field of check valves, and particularly relates to a high-pressure large-caliber energy-saving double-plate check valve.

Background

At present, the pipelines of most crude oil and petrochemical transportation systems use a double-plate check valve as a main valve for cutting off and connecting media, but in the actual use process, the media often flow through the main valve to form valve plate flaring, and phenomena of pipeline vibration, turbulence, noise and the like after the valve occur, so that the working efficiency of the pump is reduced; due to frequent movement of the moving part of the valve plate, the abrasion of the moving part is aggravated, and due to the limitation of the grinding process level of the sealing surface, the leakage amount of the valve is large due to incomplete fitting of the grinding of the sealing surface after the valve is closed, and the waste of medium conveying is caused.

Disclosure of Invention

The invention aims to overcome the problems in the prior art, provides the high-pressure large-caliber energy-saving double-plate check valve, solves the problems of high energy consumption, short service life, easiness in causing vibration, turbulence, noise and the like of a pipeline conveying medium, is reliable in sealing, and has the functions of saving energy and reducing noise.

In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:

a high-pressure large-caliber energy-saving double-plate check valve comprises a valve body and fixed blocks symmetrically arranged on two sides in the valve body, wherein a first positioning pin shaft is horizontally arranged between the bottom ends of the two fixed blocks, a second positioning pin shaft is horizontally arranged in the middle of the fixed blocks, a first valve clack and a second valve clack which are matched with each other are respectively arranged on the first positioning pin shaft, a first spring group and a second spring group are arranged in the middle of the first positioning pin shaft, the top of each fixed block is connected with a limiting seat through a locking bolt, and a sealing cross beam is vertically arranged at the bottom end in;

a first sealing cavity is arranged in the valve body, the bottom end of the first sealing cavity is communicated with a second sealing cavity, the diameter of the first sealing cavity is larger than that of the second sealing cavity, the first sealing cavity is connected with the second sealing cavity through an annular sealing surface, an annular sealing bulge is arranged on the inner side of the annular sealing surface, and a fixed clamping groove for mounting a fixed block is vertically arranged on the inner wall of the first sealing cavity; strip-shaped sealing bulges are symmetrically arranged on two sides of the top surface of the sealing beam;

the first valve clack comprises a first valve seat and first hinged seats symmetrically arranged at two ends of the first valve seat, and the first hinged seats are hinged with a first positioning pin shaft; first disk seat is including sealed valve plate and the spacing lug of setting on sealed valve plate surface, sealed valve plate includes the internal planes of vertical distribution, the internal planes both ends are connected with the semi-cylindrical surface, the internal planes is connected with the evagination curved surface with the semi-cylindrical surface top, the internal planes bottom inwards bends perpendicularly and forms the interior sealed face of supporting that links to each other with the sealed protruding contact of bar, the semi-cylindrical surface bottom inwards bends perpendicularly and forms the outer sealed face of supporting that links to each other with the sealed protruding contact of annular, interior sealed face of supporting is connected with the indent curved surface between the sealed face of supporting with the outer.

Furthermore, an arc-shaped limiting groove is formed in the inner wall of the fixed clamping groove, the limiting seat comprises a limiting block, and an arc-shaped limiting bulge matched with the arc-shaped limiting groove is formed in the bottom end of the limiting block; the locking bolt penetrates through the limiting block and is in threaded connection with the top end of the fixing block.

Furthermore, the bottom surface of the limiting block is connected with the top surface of the fixing block in close contact, and a locking pad is arranged between the locking bolt and the limiting block.

Further, the first spring group comprises two first torsion springs symmetrically installed in the middle of the first positioning pin shaft, and the second spring group comprises two second torsion springs symmetrically installed in the middle of the first positioning pin shaft; one end of the first torsion spring is abutted against the second positioning pin shaft, the other end of the first torsion spring is abutted against the first valve clack, one end of the second torsion spring is abutted against the second positioning pin shaft, and the other end of the second torsion spring is abutted against the second valve clack.

Further, the second valve flap comprises a second valve seat and second hinged seats symmetrically arranged at two ends of the second valve seat, the second hinged seats are hinged to the first positioning pin shaft, and the second valve seat is identical to the first valve seat in structure and distributed in a mirror image mode.

Furthermore, a hoisting hole is formed in the middle of the limiting convex block.

Furthermore, the inner abutting sealing surface and the outer abutting sealing surface are positioned on the same plane, and the included angle formed by the top surface of the limiting convex block and the inner abutting sealing surface is 5-15 degrees.

The invention has the beneficial effects that:

the double-plate check valve solves the problems that the existing double-plate check valve is high in energy consumption and short in service life, vibration, turbulence, noise and the like of a pipeline conveying medium are easily caused, is reliable in sealing, has the functions of energy conservation and noise reduction, is simple in structure, convenient to assemble and maintain, excellent in physical and mechanical properties and strong in practicability, and is worthy of popularization and use.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the fully closed state of the present invention;

FIG. 3 is a schematic view of the fully open state of the present invention;

FIG. 4 is a three-dimensional assembly schematic of the present invention;

FIG. 5 is a structural cross-sectional view of the present invention;

FIG. 6 is a schematic diagram of the stress of the partial structure of the present invention;

FIG. 7 is a schematic view of the flow field of the present invention in a fully open state;

fig. 8 is an enlarged view of a portion of the structure of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like are used in an orientation or positional relationship that is merely for convenience in describing and simplifying the description, and do not indicate or imply that the referenced component or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.

As shown in fig. 1 and 2, the high-pressure large-caliber energy-saving double-plate check valve comprises a valve body 1 and fixed blocks 2 symmetrically installed at two sides inside the valve body 1, a first positioning pin shaft 3 is horizontally installed between the bottom ends of the two fixed blocks 2, an adjusting pad 30 is installed at the joint of the first positioning pin shaft 3 and the fixed blocks 2, a second positioning pin shaft 4 is horizontally installed in the middle of the fixed blocks 2, a first valve clack 5 and a second valve clack 50 which are matched with each other are respectively installed on the first positioning pin shaft 3, a first spring group 6 and a second spring group 60 are installed in the middle of the first positioning pin shaft 3, the top of the fixed block 2 is connected with a limiting seat 7 through a locking bolt 8, and a sealing cross beam 9 is vertically arranged at the;

the valve body 1 is made by forging, all surfaces are machined to remove redundant materials, the surfaces are smooth, and the surface fluid resistance is small when a medium flows through the valve.

As shown in fig. 3 to 5, a first seal cavity 11 is arranged inside the valve body 1, the bottom end of the first seal cavity 11 is communicated with a second seal cavity 12, the diameter of the first seal cavity 11 is larger than that of the second seal cavity 12, the first seal cavity 11 is connected with the second seal cavity 12 through an annular seal surface 13, an annular seal bulge 14 is arranged on the inner side of the annular seal surface 13, and a fixed clamping groove 15 for mounting a fixed block 2 is vertically arranged on the inner wall of the first seal cavity 11; strip-shaped sealing bulges 91 are symmetrically arranged on two sides of the top surface of the sealing beam 9;

a tapered circular arc transition structure is designed at the inlet side flow passage hole at the bottom end of the second seal cavity 12 of the valve body and the inlet end of the seal beam 9 of the valve body, so that the fluid can reduce the resistance loss to the maximum extent when a medium enters the valve, and meanwhile, the generation of a turbulent layer between parts is avoided.

As shown in fig. 6 and 7, the first valve flap 5 comprises a first valve seat 51 and first hinge seats 52 symmetrically arranged at two ends of the first valve seat 51, and the first hinge seats 52 are hinged with the first positioning pin shaft 3; the first valve seat 51 comprises a sealing valve plate and a limiting convex block 517 arranged on the surface of the sealing valve plate, the sealing valve plate comprises an inner plane 511 which is vertically distributed, two ends of the inner plane 511 are connected with semi-cylindrical surfaces 512, the top ends of the inner plane 511 and the semi-cylindrical surfaces 512 are connected with an outer convex curved surface 513, the bottom end of the inner plane 511 is inwards and vertically bent to form an inner abutting sealing surface 514 which is in contact connection with the strip-shaped sealing protrusion 91, the bottom end of the semi-cylindrical surface 512 is inwards and vertically bent to form an outer abutting sealing surface 515 which is in contact connection with the annular sealing protrusion 14 and is of a semi-annular structure, and an inner concave curved surface; a hoisting hole 518 is formed in the middle of the limiting convex block 517, so that the valve is convenient to assemble and maintain; the inner sealing surface 514 and the outer sealing surface 515 are located on the same plane, and the included angle formed between the top surface of the limiting protrusion 517 and the inner sealing surface 514 is 5-15 °.

The design of spacing lug 517 prevents that the pipeline from pressurizing for the first time, and the valve plate is opened the overspeed, and striking round pin axle causes round pin axle deformation inefficacy.

The valve plate is designed in an arched semicircular structure, and the structure has high stress strength when the valve is closed; the outer surface is in smooth arc transition, the design principle of fluid mechanics is met, when the medium flows through the valve plate when the valve is opened, the medium cannot generate vortex and turbulent layer, the formation of cavitation on the surface of the valve plate is reduced, and the service life of the valve is prolonged.

Each sealing contact surface in the valve is sealed by adopting hard-to-hard metal, the valve has no non-metal parts, the problem of short service life of non-metal parts is solved, and the valve is suitable for long-term stable and reliable operation occasions.

As shown in fig. 8, the inner wall of the fixing slot 15 is provided with an arc-shaped limiting groove 141, the limiting seat 7 comprises a limiting block 71, and the bottom end of the limiting block 71 is provided with an arc-shaped limiting protrusion 72 matched with the arc-shaped limiting groove 141; the locking bolt 8 penetrates through the limiting block 71 to be in threaded connection with the top end of the fixing block 2; the bottom surface of the limiting block 71 is closely contacted and connected with the top surface of the fixed block 2, and a locking pad is arranged between the locking bolt 8 and the limiting block 71; the anti-shear design of spacing seat 7 prevents that pipeline water hammer from leading to the valve plate to open the overspeed, leads to the limiting plate atress bending failure.

By adopting the built-in structural design, the valve has no external leakage point, the fixed block 2 and the limiting seat 7 are connected with the anti-loosening pad through the locking bolt 8, the possibility of external leakage of the valve is eliminated, and the valve is suitable for long-distance pipelines which are not beneficial to maintenance.

The first spring group 6 comprises two first torsion springs symmetrically arranged in the middle of the first positioning pin shaft 3, and the second spring group 60 comprises two second torsion springs symmetrically arranged in the middle of the first positioning pin shaft 3; one end of the first torsion spring is abutted against the second positioning pin shaft 4, the other end of the first torsion spring is abutted against the first valve clack 5, one end of the second torsion spring is abutted against the second positioning pin shaft 4, and the other end of the second torsion spring is abutted against the second valve clack 50; the second valve flap 50 comprises a second valve seat and second hinged seats symmetrically arranged at two ends of the second valve seat, the second hinged seats are hinged to the first positioning pin shaft 3, and the second valve seat and the first valve seat 51 are identical in structure and are distributed in a mirror image mode.

As shown in figure 3, because the included angle formed by the top surface of the limit bump 517 and the inner abutting sealing surface 514 is 5 degrees to 15 degrees, when the check valve is in the maximum opening state, the included angle formed by the inner abutting sealing surface 514 and the surface of the strip-shaped sealing bulge 91 is 75 degrees to 85 degrees, and the check valve is not completely opened, when fluid passes through the valve, the valve plate can not cause frequent shaking of the valve plate due to the non-intermittence and pressure instability of the fluid flowing in the pipeline, thereby effectively reducing the noise when the valve works, reducing the abrasion of the matching surface of the moving parts of the valve plate, improving the working efficiency of the pump to the maximum extent, and reducing the damage of the vibration to the pipeline.

The valve has the advantages that the diameter is larger than that of the NPS 32, the pressure is higher than that of the Class900, the final acceptance standard is API 598 valve inspection and test, the acceptance leakage amount is very low, the grinding goodness fit requirement on the sealing surfaces of the valve body and the valve plate is higher, and the grinding process is as follows: grinding the valve plate sealing surface by using a surface grinder after rough machining to serve as a reference match grinding plane, wherein the surface unevenness is less than or equal to 0.01mm/m and the surface roughness is less than or equal to 0.2 mu m, roughly grinding the valve body sealing surface by using a cast iron flat plate after machining, wherein the surface unevenness is less than or equal to 0.05mm/m and the surface roughness is less than or equal to 1.6 mu m after rough grinding, then performing match grinding with the valve plate, testing the goodness of fit between the valve plate and the valve body by using a coloring developer to ensure that the goodness of fit of a sealing pair is greater than 98%, testing, actually measuring the leakage rate of high-pressure water sealing is 8cm3/min, and actually measuring the leakage rate. The standard leakage rate of high-pressure water seal required by API 598 & lt & gt inspection and test of valve & gt is 96cm3/min, the standard leakage rate of low-pressure gas seal is 373cm3/S, the sealing effect is good, the leakage rate is low, and the loss of energy consumption after the valve is closed is effectively reduced.

When fluid begins to flow, the valve plate is opened, the action point of the elastic force of the torsion spring playing a role in reaction is positioned at the position close to the outside of the center of the valve plate surface, so that the root part of the valve plate is firstly opened, the friction phenomenon of the sealing surface when the old conventional valve plate is opened is avoided, and the abrasion of parts is eliminated;

when the flow rate slows down, the torsional spring automatically counteracts to close the valve plate and approach the valve body, thus reducing the stroke distance and time of closing, when the fluid flows backwards, the valve plate gradually approaches the annular sealing surface 13, the dynamic reaction of the valve is greatly accelerated, the influence of water hammer phenomenon is reduced, and the non-impact performance is realized;

when closing, the torsional spring elastic action makes the valve plate top close at first, prevents that the valve clack root from appearing stinging the mill phenomenon for the valve can keep the sealed wholeness of longer time.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.