One-way valve

Abstract

The one-way valve comprises a valve body assembly and a valve seat assembly, the valve seat assembly comprises a valve seat, and the valve seat is fixedly connected with the valve body assembly; the valve body assembly comprises a first valve body assembly and a second valve body assembly, the first valve body assembly is fixedly connected with the valve seat, the second valve body assembly is fixedly connected with the valve seat, the first valve body assembly comprises a first connecting pipe and a second connecting pipe, and the first connecting pipe and the second connecting pipe are stainless steel pipes; at least one includes a first section and a second section closer to the valve seat assembly than the first section, the second section having a diameter greater than that of the first section. The one-way valve can reduce the machining difficulty.

Description

Technical Field

[0001] The present application relates to the technical field of valve equipment, and in particular to a one-way valve. Background Art

[0002] One-way valves are widely used in refrigeration systems to serve as reverse cutoff valves.

[0003] Both ends of the valve body of the one-way valve are provided with joints, and the middle section of the valve body is fixed to the valve seat of the valve seat assembly. The diameter difference between the valve port of the joint and the valve seat is relatively large. Therefore, the valve body needs to be set with a higher shrinkage rate (shrinkage rate = (diameter before shrinkage - diameter after shrinkage) / diameter before shrinkage, the shrinkage rate is generally greater than 40%, and even reaches 55%). The valve body in the prior art mainly includes copper tubes and stainless steel tubes. Among them, copper tubes are easy to achieve a higher shrinkage rate, but the cost is relatively high. Although the cost of stainless steel tubes is relatively low, when the shrinkage rate requirement is high, stainless steel tubes are difficult to process, prone to cracking, and have a high scrap rate.

[0004] Therefore, for a one-way valve, how to reduce the difficulty of processing the stainless steel tube in the valve body is a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0005] The purpose of this application is to provide a one-way valve that can reduce the processing difficulty of each connecting pipe, improve product yield, and reduce material costs.

[0006] To solve the above technical problems, the present application provides a one-way valve, including a valve body assembly and a valve seat assembly, the valve seat assembly including a valve seat, and the valve seat is fixedly connected to the valve body assembly; the valve body assembly includes a first valve body assembly and a second valve body assembly, the first valve body assembly is fixedly connected to the valve seat, and the second valve body assembly is fixedly connected to the valve seat, the first valve body assembly includes a first connecting pipe and a second connecting pipe, the first connecting pipe and the second connecting pipe are both stainless steel pipes, at least one of the first connecting pipe and the second connecting pipe includes a first section and a second section, the second section is closer to the valve seat assembly than the first section, and the diameter of the second section is larger than the diameter of the first section.

[0007] When there is a large difference between the diameter of the valve port of the valve seat and the diameter of the joint, if only one connecting pipe is provided between the valve seat and the joint, the shrinkage rate requirement of the connecting pipe is relatively large. At this time, the processing difficulty of the connecting pipe is relatively high, the scrap rate is high, and the material cost is high. In the present application, by providing two or more connecting pipes between the valve seat and the joint, each connecting pipe can achieve a step-by-step diameter change, thereby reducing the diameter difference between the two ends of the connecting pipe with a variable diameter structure, and then reducing the shrinkage rate requirement of each connecting pipe, thereby reducing the processing difficulty of each connecting pipe, improving the product yield, and reducing the material cost.

[0008] Optionally, the first connecting pipe includes the first section and the second section, a first transition section is included between the first section and the second section, and the diameter of the first transition section gradually increases from the first section to the second section; the second connecting pipe includes a third section, a fourth section and a second transition section, the diameter of the fourth section is larger than the diameter of the third section, and the diameter of the second transition section gradually increases from the third section to the fourth section, the third section is directly or indirectly fixedly connected to the second section, and the fourth section is welded and fixed to the valve seat.

[0009] Optionally, the first valve body assembly also includes a third connecting pipe, the third connecting pipe includes a fifth section, a sixth section and a third transition section, the diameter of the third transition section gradually increases from the fifth section to the sixth section, the fifth section is fixedly connected to the second section, and the sixth section is fixedly connected to the third section.

[0010] Optionally, the first connecting pipe includes the first section and the second section, and a first transition section is included between the first section and the second section, and the diameter of the first transition section gradually increases from the first section to the second section; the second connecting pipe is a straight pipe, one end of the second connecting pipe is welded and fixed to the second section, and the other end of the second connecting pipe is welded and connected to the valve seat.

[0011] Optionally, the first valve body assembly also includes a third connecting pipe, the third connecting pipe includes a fifth section, a sixth section and a third transition section, the diameter of the third transition section gradually increases from the fifth section to the sixth section, the fifth section is fixedly connected to the second section, and the sixth section is fixedly connected to the second connecting pipe.

[0012] Optionally, the second valve body assembly includes a fourth connecting pipe and a fifth connecting pipe, both of which are stainless steel pipes, and at least one of the fourth connecting pipe and the fifth connecting pipe includes a seventh section and an eighth section, the eighth section is closer to the valve seat assembly than the seventh section, and the diameter of the eighth section is greater than the diameter of the seventh section.

[0013] Optionally, the fourth connecting pipe includes the seventh section and the eighth section, and the fourth transition section is included between the seventh section and the eighth section, and the diameter of the fourth transition section gradually increases from the seventh section to the eighth section; the fifth connecting pipe includes the ninth section, the tenth section and the fifth transition section, the diameter of the tenth section is greater than the diameter of the ninth section, and the diameter of the fifth transition section gradually increases from the ninth section to the tenth section, the ninth section is directly or indirectly fixedly connected to the eighth section, and the tenth section is welded and fixed to the valve seat.

[0014] Optionally, the second valve body assembly also includes a sixth connecting pipe, the sixth connecting pipe includes an eleventh section, a twelfth section and a sixth transition section, the diameter of the sixth transition section gradually increases from the eleventh section toward the twelfth section, the eleventh section is fixedly connected to the eighth section, and the twelfth section is fixedly connected to the ninth section.

[0015] Optionally, the fourth connecting pipe includes the seventh section and the eighth section, and a fourth transition section is included between the seventh section and the eighth section, and the diameter of the fourth transition section gradually increases from the seventh section toward the eighth section; the fifth connecting pipe is a straight pipe, one end of the fifth connecting pipe is welded and fixed to the eighth section, and the other end of the fifth connecting pipe is welded and connected to the valve seat.

[0016] Optionally, the second valve body assembly also includes a sixth connecting pipe, the sixth connecting pipe includes an eleventh section, a twelfth section and a sixth transition section, the diameter of the sixth transition section gradually increases from the eleventh section toward the twelfth section, the eleventh section is fixedly connected to the eighth section, and the twelfth section is fixedly connected to the second connecting pipe.

[0017] Optionally, two adjacent connecting pipes are overlapped and fixed by welding, or two adjacent connecting pipes are butt-jointed and fixed by welding.

[0018] Optionally, annular step structures are respectively provided on both sides of the valve seat along the circumferential direction, and the ends of the first valve body assembly and the second valve body assembly are respectively sleeved outside the corresponding annular step structures and fixed by welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the internal structure of an embodiment of a one-way valve provided in an embodiment of the present application;

[0020] Figure 2 yes Figure 1 The structural diagram of the valve body assembly;

[0021] Figure 3 It is a schematic diagram of the internal structure of another embodiment of the one-way valve provided in the embodiment of the present application;

[0022] Figure 4 Schematic diagram of the internal structure of another embodiment of the one-way valve provided in the embodiment of the present application;

[0023] Figure 5 It is a schematic diagram of the internal structure of another embodiment of the one-way valve provided in the embodiment of the present application;

[0024] Figure 6 It is a structural schematic diagram of the valve seat assembly of the one-way valve provided in an embodiment of the present application.

[0025] Attached Figure 1-Figure 6 In the figure, the reference numerals are described as follows:

[0026] 10 valve body assembly; 20 valve seat assembly, 201 valve seat, 202 annular step structure; 30 joint;

[0027] 1 first valve body assembly, 11 first connecting pipe, 12 second connecting pipe, 13 third connecting pipe, 14 first section, 15 second section, 16 third section, 17 fourth section, 18 fifth section, 19 sixth section, 110 first transition section, 111 second transition section, 112 third transition section;

[0028] 2 second valve body assembly, 21 fourth connecting pipe, 22 fifth connecting pipe, 23 sixth connecting pipe, 24 seventh section, 25 eighth section, 26 ninth section, 27 tenth section, 28 eleventh section, 29 twelfth section, 210 fourth transition section, 211 fifth transition section, 212 sixth transition section. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] The “fixing” mentioned below may be welding fixing, such as laser welding fixing.

[0031] The present application embodiment provides a one-way valve, such as Figure 1-Figure 3 As shown, the one-way valve includes a valve body assembly 10 and a valve seat assembly 20, wherein the valve seat assembly 20 includes a valve seat 201, and the valve seat 201 is fixed to the valve body assembly 10. Joints 30 are provided at both ends of the valve body assembly 10, respectively, and the valve seat 201 is located in the middle section of the valve body assembly 10 and is fixed to the valve body assembly 10. The diameter of the joint 30 is smaller than the diameter of the valve port of the valve seat 201, so the diameter of the middle section of the valve body assembly 10 is larger than the diameter of the connection between the end of the valve body assembly 10 and the joint 30. The middle section of the valve body assembly 10 refers to the middle position located at both ends of the valve body assembly 10, which may be located approximately in the middle position in the length direction of the valve body assembly 10, and is not strictly located in the middle position in the length direction of the valve body assembly 10. However, it should be noted that the position of the valve seat 201 is not strictly limited, as long as its function can be achieved.

[0032] It should be noted that the joints 30 are not essential, but are just a specific example in the embodiment of the present application.

[0033] As used herein, the "diameter" refers to the "inner diameter" of the corresponding structure.

[0034] like Figure 1 and Figure 2As shown, the valve body assembly 10 includes a first valve body assembly 1 and a second valve body assembly 2, wherein the first valve body assembly 1 is fixedly connected to the valve seat 201, the second valve body assembly 2 is fixedly connected to the valve seat 201, and the first valve body assembly 1 and the second valve body assembly 2 are respectively located on both sides of the valve seat 201.

[0035] like Figure 1 and Figure 2 As shown, the first valve body assembly 1 includes a first connecting pipe 11 and a second connecting pipe 12, both of which are stainless steel pipes and are connected between the valve seat assembly 20 and the joint 30, wherein at least one of the first connecting pipe 11 and the second connecting pipe 12 is a variable diameter structure, and the connecting pipe of the variable diameter structure includes a first section 14 and a second section 15, and the second section 15 is closer to the valve seat assembly 20 than the first section 14, and the diameter of the second section 15 is greater than the diameter of the first section 14, that is, the large diameter section of the variable diameter pipe is arranged toward one side of the valve seat assembly 20.

[0036] Specifically, the first connecting tube 14 may be a reducing tube, or the second connecting tube 15 may be a reducing tube, or both the first connecting tube 14 and the second connecting tube 15 may be reducing tubes. The first valve body assembly 1 includes at least two connecting tubes between the valve seat assembly 20 and the joint 30, and at least one of the connecting tubes is a reducing tube. With such an arrangement, the diameter of the tube can be gradually reduced between the valve seat assembly 20 and the joint 30, thereby reducing the diameter difference between the two ends of each connecting tube, thereby reducing the shrinkage rate requirement of each connecting tube, thereby reducing the processing difficulty of each connecting tube and improving the product yield.

[0037] like Figure 1 and Figure 2 As shown, the first connecting pipe 11 is a reducing pipe, and the first connecting pipe 11 includes a first section 14, a second section 15 and a first transition section 110. The first transition section 110 is a reducing structure, and the diameter of the first transition section 110 gradually increases from the first section 14 to the second section 15, and a transition connection is achieved between the first section 14 and the second section 15.

[0038] The second connecting pipe 12 can be a reducer or a straight pipe. Figure 1-Figure 3 As shown, when the second connecting pipe 12 is a reducer, the second connecting pipe 12 includes a third section 16, a fourth section 17 and a second transition section 111, wherein the diameter of the fourth section 17 is greater than the diameter of the third section 16, the fourth section 17 is welded to the valve seat assembly 2, and the third section 16 is directly or indirectly welded to the second section 15.

[0039] The second connecting pipe 12 is located on a side close to the valve seat assembly 20, and the first connecting pipe 11 is located on a side close to the joint 30. By arranging a two-stage reducer between the valve seat assembly 20 and the joint 30, the diameter difference between the two ends of each connecting pipe can be further reduced, thereby reducing the shrinkage rate requirement of each connecting pipe, thereby reducing the processing difficulty of each connecting pipe and improving the product yield.

[0040] like Figure 4 As shown, the second connecting pipe 12 can also be a straight pipe, that is, the inner diameter of the second connecting pipe 12 along its length direction remains unchanged, one end of the second connecting pipe 12 is fixedly connected to the valve seat 201, and the other end of the second connecting pipe 12 is directly or indirectly welded and fixed to the second section 15. Specifically, the diameter of the second connecting pipe 12 can be larger than the diameter of the second section 15, and the end of the second section 15 is sleeved in the second connecting pipe 12 and fixed by circumferential sealing welding. In this way, a first-level diameter change can be achieved at the connection between the second section 15 and the second connecting pipe 12. Of course, the end of the second connecting pipe 12 can also be butted against the end of the second section 15, and fixed by circumferential sealing welding.

[0041] Of course, the first connecting pipe 11 may be a straight pipe, and the second connecting pipe 12 may be a variable diameter structure and include a first section 14 and a second section 15 .

[0042] like Figure 5 As shown, a third connecting tube 13 is connected and fixed between the first connecting tube 11 and the second connecting tube 12. The third connecting tube 13 can be a reducing tube or a straight tube, and no specific limitation is made here. When the third connecting tube 13 is a reducing tube, the diameter difference between the two ends of each connecting tube can be further reduced, thereby reducing the shrinkage rate requirement of each connecting tube, thereby reducing the processing difficulty of each connecting tube and improving the product yield.

[0043] like Figure 5 As shown, the third connecting pipe 13 includes a fifth section 18, a sixth section 19 and a third transition section 112, wherein the diameter of the third transition section 112 gradually increases from the fifth section 18 to the sixth section 19, the fifth section 18 is fixedly connected to the second section 15, the sixth section 19 is welded and fixedly connected to the end of the second connecting pipe 12, and when the second connecting pipe 12 includes a third section 16 and a fourth section 17, the sixth section 19 is welded and fixedly connected to the third section 16.

[0044] The structure of the second valve body assembly 2 is similar to that of the first valve body assembly 1. In the embodiments given herein, the first valve body assembly 1 and the second valve body assembly 2 have the same structure to facilitate standardized processing during product production. Figure 1 and Figure 2As shown, the second valve body assembly 2 includes a fourth connecting pipe 21 and a fifth connecting pipe 22, wherein the fourth connecting pipe 21 and the fifth connecting pipe 22 are both stainless steel pipes and are connected between the valve seat assembly 20 and another joint 30, wherein at least one of the fourth connecting pipe 21 and the fifth connecting pipe 22 is a variable diameter structure, and the connecting pipe of the variable diameter structure includes a seventh section 24 and an eighth section 25, the eighth section 25 is closer to the valve seat assembly 20 than the seventh section 24, and the diameter of the eighth section 25 is larger than the diameter of the seventh section 24, that is, the large diameter section of the variable diameter pipe is arranged toward one side of the valve seat assembly 20.

[0045] Specifically, the fourth connecting tube 21 may be a reducing tube, or the fifth connecting tube 22 may be a reducing tube, or both the fourth connecting tube 21 and the fifth connecting tube 22 may be reducing tubes. The second valve body assembly 2 is between the valve seat assembly 20 and the joint 30, and includes at least two connecting tubes, and at least one of the connecting tubes is a reducing tube. With such an arrangement, the diameter of the tube can be gradually reduced between the valve seat assembly 20 and the joint 30, thereby reducing the diameter difference between the two ends of each connecting tube, and further reducing the shrinkage rate requirement of each connecting tube, thereby reducing the processing difficulty of each connecting tube and improving the product yield.

[0046] like Figure 1 and Figure 2 As shown, the fourth connecting pipe 21 is a reducing pipe. The fourth connecting pipe 21 includes a seventh section 24, an eighth section 25 and a fourth transition section 210. The fourth transition section 210 is a reducing structure. The diameter of the fourth transition section 210 gradually increases from the seventh section 24 to the eighth section 25, and a transition connection is realized between the seventh section 24 and the eighth section 25.

[0047] The fifth connecting pipe 22 can be a reducing pipe or a straight pipe. Figure 1-Figure 3 As shown, when the fifth connecting pipe 22 is a reducer, the fifth connecting pipe 22 includes a ninth section 26, a tenth section 27 and a fifth transition section 211, wherein the diameter of the tenth section 27 is greater than the diameter of the ninth section 26, the tenth section 27 is welded and fixed to the valve seat assembly 2, and the ninth section 26 is directly or indirectly welded and fixed to the eighth section 25.

[0048] The fifth connecting pipe 22 is located on the side close to the valve seat assembly 20, and the fourth connecting pipe 21 is located on the side close to the joint 30. By setting a two-stage reducer between the valve seat assembly 20 and the joint 30, the diameter difference between the two ends of each connecting pipe can be further reduced, thereby reducing the shrinkage rate requirement of each connecting pipe, thereby reducing the processing difficulty of each connecting pipe, improving product yield, and reducing material costs.

[0049] like Figure 4As shown, the fifth connecting pipe 22 can also be a straight pipe, that is, the inner diameter of the fifth connecting pipe 22 along its length direction remains unchanged, one end of the fifth connecting pipe 22 is fixedly connected to the valve seat 201, and the other end of the fifth connecting pipe 22 is directly or indirectly welded and fixed to the eighth section 25. Specifically, the diameter of the fifth connecting pipe 22 can be greater than the diameter of the eighth section 25, and the end of the eighth section 25 is sleeved in the fifth connecting pipe 22 and fixed by circumferential sealing welding. In this way, a first-level diameter change can be achieved at the connection between the eighth section 25 and the fifth connecting pipe 22. Of course, the end of the fifth connecting pipe 22 can also be butted against the end of the eighth section 25, and fixed by circumferential sealing welding.

[0050] Of course, the fourth connecting pipe 21 may be a straight pipe, and the fifth connecting pipe 22 may be a variable diameter structure and include the seventh section 24 and the eighth section 25 .

[0051] like Figure 5 As shown, a sixth connecting tube 23 is connected and fixed between the fourth connecting tube 21 and the fifth connecting tube 22. The sixth connecting tube 23 can be a reducing tube or a straight tube, and no specific limitation is made here. When the sixth connecting tube 23 is a reducing tube, the diameter difference between the two ends of each connecting tube can be further reduced, thereby reducing the shrinkage rate requirement of each connecting tube, thereby reducing the processing difficulty of each connecting tube, improving the product yield, and reducing the material cost.

[0052] like Figure 5 As shown, the sixth connecting tube 23 includes an eleventh section 28, a twelfth section 29 and a sixth transition section 212, wherein the diameter of the sixth transition section 212 gradually increases from the eleventh section 28 toward the twelfth section 29, the eleventh section 28 is fixedly connected to the eighth section 25, the twelfth section 29 is fixedly connected to the end of the fifth connecting tube 22, and when the fifth connecting tube 22 includes a ninth section 26 and a tenth section 27, the twelfth section 29 is fixedly connected to the ninth section 26.

[0053] When the diameter of the valve port of the valve seat 201 and the diameter of the connector 30 differ greatly, if only one connecting pipe is provided between the valve seat 201 and the connector 30, the shrinkage rate requirement of the connecting pipe is relatively large. At this time, the processing difficulty of the connecting pipe is relatively high, the scrap rate is high, and the material cost is high. In the present embodiment, by providing two or more connecting pipes between the valve seat 201 and the connector 30, the diameter can be gradually reduced through each connecting pipe, thereby reducing the diameter difference between the two ends of the connecting pipe with a variable diameter structure, thereby reducing the shrinkage rate requirement of each connecting pipe, thereby reducing the processing difficulty of each connecting pipe and improving the product yield.

[0054] Specifically, the number of connecting pipes between the joint 30 and the valve seat 201, whether each connecting pipe adopts a reducer, the shrinkage rate of each reducer, etc., can be set within the inventive concept of the present application according to the requirements of the total shrinkage rate of the actual valve body assembly 10, and no specific restrictions are made here.

[0055] Each connecting pipe, including the first connecting pipe 11, the second connecting pipe 12, the third connecting pipe 13, the fourth connecting pipe 21, the fifth connecting pipe 22 and the sixth connecting pipe 23, is made of stainless steel pipes, which has low material cost. In addition, each connecting pipe is an integrated structure.

[0056] The number and structure of the connecting pipes between the two joints 30 and the valve seat 201 are exactly the same, that is, the connecting pipes of the first valve body assembly 1 and the second valve body assembly 2 on both sides of the valve seat 201 are symmetrically arranged, that is, the first connecting pipe 11 and the fourth connecting pipe 21 are symmetrically arranged, the second connecting pipe 12 and the fifth connecting pipe 22 are symmetrically arranged, and the third connecting pipe 13 and the sixth connecting pipe 23 are symmetrically arranged. In this way, the overall structure of the one-way valve can be made more regular, and the universality of each connecting pipe is good.

[0057] Of course, the settings of the connecting pipes of the first valve body assembly 1 and the second valve body assembly 2 may also be different. For example, the first valve body assembly 1 may be provided with two connecting pipes, and the second valve body assembly 2 may be provided with three connecting pipes. The number of connecting pipes can be set to meet the shrinkage rate requirement of the valve body assembly 10 from the valve seat 201 to the joint 30.

[0058] In this embodiment, four or more connecting pipes can be arranged between the joint 30 and the valve seat 201. When two or three connecting pipes are arranged between the joint 30 and the valve seat 201, the overall structure can be simplified while reducing the processing difficulty and improving the product yield.

[0059] In this embodiment, the ends of the first connecting tube 11 and the fourth connecting tube 21 can be fixedly connected to a copper tube, which forms the above-mentioned joint 30. Alternatively, the joint 30 can be formed at the ends of the first connecting tube 11 and the fourth connecting tube 21 by plating or the like, and no specific limitation is made here.

[0060] When the joint 30 is formed by the copper tube, the joint 30 and the first connecting tube 11 and the fourth connecting tube 21 are overlapped and fixed by brazing.

[0061] Take the connection between the joint 30 and the first connecting pipe 11 as an example. Figure 1 , Figure 4-Figure 6As shown, the joint 30 is partially located inside the first connecting tube 11 and partially located outside the first connecting tube 11, and then is welded and fixed to the first connecting tube 11 along the circumferential direction of the outer wall of the joint 30. Such a configuration facilitates the welding operation of the joint 30 and the first connecting tube 11 compared to the solution of completely embedding the joint 30 inside the connecting tube.

[0062] like Figure 1 , Figure 3-Figure 5 As shown, in this embodiment, the valve seat 201 is sandwiched between the second connecting pipe 12 and the fifth connecting pipe 22 and fixed by welding, which can simplify the structure of the valve seat 201 and the assembly process.

[0063] like Figure 6 As shown, an annular step structure 202 is provided on both sides of the valve seat 201 along the circumferential direction. Taking the connection between the second connecting pipe 12 and the valve seat 201 as an example, the end of the second connecting pipe 12 is sleeved outside the annular step structure 202, and then the second connecting pipe 12 and the valve seat 201 are welded and fixed. The second connecting pipe 12 and the valve seat 201 can be fixed by laser welding or by brazing.

[0064] The connection between two adjacent connecting pipes can be fixed by overlapping and welding by laser welding or brazing, or the two adjacent connecting pipes can be fixed by butting and laser welding. Specifically, all the connections can be fixed by overlapping welding, or all the connections can be fixed by butt welding, or some of the connections can be fixed by overlapping welding and some of the connections can be fixed by butt welding.

[0065] Take the fixing method between the connecting pipes of the first valve body assembly 1 as an example. Figure 1 and Figure 2 As shown, the end of the second connecting tube 12 overlaps the end of the first connecting tube 11, that is, the end of the second connecting tube 12 is sleeved outside the end of the first connecting tube 11 and is welded and fixed by laser welding or brazing. At this time, the diameter of the end of the second connecting tube 12 is larger than the diameter of the end of the first connecting tube 11. Figure 3 As shown, the end of the second connecting tube 12 is butted against the end of the first connecting tube 11 and fixed by laser welding or the like. At this time, the diameter of the end of the second connecting tube 12 is equal to the diameter of the end of the first connecting tube 11 .

[0066] Similarly, when the third connecting pipe 13 is provided, the third connecting pipe 13 and the first connecting pipe 11, or the third connecting pipe 13 and the second connecting pipe 12, can be overlapped and fixed by welding or butted and fixed by welding.

[0067] Of course, two adjacent connecting pipes, the connecting pipe and the valve seat 201, and the connecting pipe and the joint 30 can also be connected and fixed by interference fit. When fixed by welding, the processing accuracy requirements can be reduced and the installation process can be simplified.

[0068] Each connecting pipe is an integral structure. In the connecting pipe with a variable diameter structure, the small diameter section (such as the first section 14, the third section 16, the fifth section 18, the seventh section 24, the ninth section 26, and the eleventh section 28) and each transition section can be a spinning compression section formed by a spinning compression mouth, or the large diameter section (such as the second section 15, the fourth section 17, the sixth section 19, the eighth section 25, the tenth section 27, and the twelfth section 29) can be set as an expanding section formed by expanding the mouth, and no specific limitation is made here.

[0069] The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A one-way valve, characterized in that: It comprises a valve body assembly and a valve seat assembly, wherein the valve seat assembly comprises a valve seat, and the valve seat is fixedly connected to the valve body assembly; The valve body assembly includes a first valve body assembly and a second valve body assembly, the first valve body assembly is fixedly connected to the valve seat, the second valve body assembly is fixedly connected to the valve seat, the first valve body assembly includes a first connecting pipe and a second connecting pipe, the first connecting pipe and the second connecting pipe are both stainless steel pipes, at least one of the first connecting pipe and the second connecting pipe includes a first section and a second section, the second section is closer to the valve seat assembly than the first section, and the diameter of the second section is larger than the diameter of the first section.

2. The one-way valve according to claim 1, characterized in that: The first connecting pipe includes the first section and the second section, and a first transition section is included between the first section and the second section, and the diameter of the first transition section gradually increases from the first section to the second section; The second connecting pipe includes a third section, a fourth section and a second transition section. The diameter of the fourth section is larger than that of the third section. The diameter of the second transition section gradually increases from the third section to the fourth section. The third section is directly or indirectly fixedly connected to the second section, and the fourth section is welded and fixed to the valve seat.

3. The one-way valve according to claim 2, characterized in that: The first valve body assembly also includes a third connecting pipe, which includes a fifth section, a sixth section and a third transition section. The diameter of the third transition section gradually increases from the fifth section to the sixth section. The fifth section is fixedly connected to the second section, and the sixth section is fixedly connected to the third section.

4. The one-way valve according to claim 1, characterized in that: The first connecting pipe includes the first section and the second section, and a first transition section is included between the first section and the second section, and the diameter of the first transition section gradually increases from the first section to the second section; The second connecting pipe is a straight pipe, one end of the second connecting pipe is welded and fixed to the second section, and the other end of the second connecting pipe is welded and connected to the valve seat.

5. The one-way valve according to claim 4, characterized in that: The first valve body assembly also includes a third connecting pipe, which includes a fifth section, a sixth section and a third transition section. The diameter of the third transition section gradually increases from the fifth section to the sixth section. The fifth section is fixedly connected to the second section, and the sixth section is fixedly connected to the second connecting pipe.

6. The one-way valve according to any one of claims 1 to 5, characterized in that: The second valve body assembly includes a fourth connecting pipe and a fifth connecting pipe, both of which are stainless steel pipes. At least one of the fourth connecting pipe and the fifth connecting pipe includes a seventh section and an eighth section, the eighth section is closer to the valve seat assembly than the seventh section, and the diameter of the eighth section is greater than the diameter of the seventh section.

7. The one-way valve according to claim 6, characterized in that: The fourth connecting pipe includes the seventh section and the eighth section, and a fourth transition section is included between the seventh section and the eighth section, and the diameter of the fourth transition section gradually increases from the seventh section to the eighth section; The fifth connecting pipe includes a ninth section, a tenth section and a fifth transition section. The diameter of the tenth section is greater than the diameter of the ninth section. The diameter of the fifth transition section gradually increases from the ninth section to the tenth section. The ninth section is directly or indirectly fixedly connected to the eighth section, and the tenth section is welded and fixed to the valve seat.

8. The one-way valve according to claim 7, characterized in that: The second valve body assembly also includes a sixth connecting pipe, which includes an eleventh section, a twelfth section and a sixth transition section. The diameter of the sixth transition section gradually increases from the eleventh section to the twelfth section. The eleventh section is fixedly connected to the eighth section, and the twelfth section is fixedly connected to the ninth section.

9. The one-way valve according to claim 6, characterized in that: The fourth connecting pipe includes the seventh section and the eighth section, and a fourth transition section is included between the seventh section and the eighth section, and the diameter of the fourth transition section gradually increases from the seventh section to the eighth section; The fifth connecting pipe is a straight pipe, one end of the fifth connecting pipe is welded and fixed to the eighth section, and the other end of the fifth connecting pipe is welded and connected to the valve seat.

10. The one-way valve according to claim 9, characterized in that: The second valve body assembly also includes a sixth connecting pipe, which includes an eleventh section, a twelfth section and a sixth transition section. The diameter of the sixth transition section gradually increases from the eleventh section to the twelfth section. The eleventh section is fixedly connected to the eighth section, and the twelfth section is fixedly connected to the second connecting pipe.

11. The one-way valve according to any one of claims 1 to 5, characterized in that: Two adjacent connecting pipes are overlapped and fixed by welding, or two adjacent connecting pipes are butt-jointed and fixed by welding.

12. The one-way valve according to any one of claims 1 to 5, characterized in that: Both sides of the valve seat are provided with annular step structures along the circumferential direction, and the ends of the first valve body assembly and the second valve body assembly are respectively sleeved outside the corresponding annular step structures and fixed by welding.

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