Connecting pipe assembly and one-way valve

Abstract

The utility model relates to the technical field of one-way valves, in particular to a connecting pipe assembly and a one-way valve. The connecting pipe assembly comprises a valve pipe, a connecting pipe and a welding ring, and a step part is formed on the inner wall of the valve pipe. The welding ring is placed on the step portion, the connecting pipe is inserted into the valve pipe from the end, provided with the step portion, of the valve pipe and extends into the valve pipe along with the connecting pipe, and the connecting pipe can abut against the welding ring and is matched with the step portion to clamp the welding ring. According to the connecting pipe assembly and the one-way valve, the problem that the weldability between the valve pipe and the connecting lining of an existing one-way valve is poor is solved.

Description

Technical Field

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

[0002] One-way valves are widely used in air conditioning systems. They achieve one-way flow of refrigerant through the active cooperation of the internal diaphragm and the valve seat. The one-way valve also includes a valve pipe and a connecting sleeve. The valve seat is fixed in the valve pipe, and the connecting sleeve is inserted and connected to the valve pipe. The connecting sleeve is used to connect the one-way valve to external components.

[0003] In the related art, the end of the connecting bushing is stamped to form a flange structure that shrinks toward the axial direction, and the solder is accommodated by the accommodating area formed between the flange structure and the inner wall of the valve tube. However, the solder can only be placed in this structure after the connecting bushing is installed, and the solder is not fixed. The solder is easy to move during the welding process, resulting in poor welding performance between the valve tube and the connecting bushing, and reducing the welding qualification rate. Utility Model Content

[0004] Based on this, it is necessary to provide a pipe assembly and a one-way valve to solve the problem of poor weldability between the valve pipe and the connecting bushing of the existing one-way valve.

[0005] The present application provides a connecting pipe assembly, which includes a valve pipe, a connecting pipe and a welding ring. The inner wall of the valve pipe is formed with a step portion; the welding ring is placed on the step portion, and the connecting pipe is inserted into the valve pipe from one end of the valve pipe where the step portion is provided, and extends into the valve pipe along with the connecting pipe. The connecting pipe can abut against the welding ring and cooperate with the step portion to clamp the welding ring.

[0006] In one embodiment, the wall thickness M of the connecting pipe and the cross-sectional width N of the welding ring satisfy:

[0007] In one embodiment, the inner wall of the valve tube and the outer wall of the connecting tube are interference fit.

[0008] In one of the embodiments, one or both of the inner wall of the valve tube and the outer wall of the connecting tube are provided with a flow groove, and the flow groove is used for allowing solder to flow when the valve tube and the connecting tube are welded, so that the solder can penetrate into between the inner wall of the valve tube and the outer wall of the connecting tube through the flow groove.

[0009] In one embodiment, the length of the flow channel groove is greater than or equal to the length of the connecting pipe inserted into the valve pipe.

[0010] In one embodiment, a flared section is provided at one end of the connecting tube away from the valve tube, and the inner diameter of the flared section gradually increases along the axial direction of the connecting tube and from the valve tube to the connecting tube; or, a narrowed section is provided at one end of the connecting tube away from the valve tube, and the inner diameter of the narrowed section gradually decreases along the axial direction of the connecting tube and from the valve tube to the connecting tube.

[0011] In one embodiment, the valve pipe is made of stainless steel, and the connecting pipe is made of copper.

[0012] The present application also provides a one-way valve, which includes a valve seat assembly and a connecting pipe assembly as described in any one of the above embodiments, wherein one end of the valve pipe in the connecting pipe assembly that is away from the connecting pipe is connected to the valve seat assembly.

[0013] In one embodiment, the number of the connecting pipe assemblies is two, and they are respectively defined as a first connecting pipe assembly and a second connecting pipe assembly, the valve seat assembly has a circulation channel, and the opposite ends of the valve seat assembly along the refrigerant circulation direction are respectively connected to the first connecting pipe assembly and the second connecting pipe assembly, and the first connecting pipe assembly is connected to the second connecting pipe assembly through the circulation channel; wherein the valve pipe in the first connecting pipe assembly and the valve pipe in the second connecting pipe assembly have the same length.

[0014] In one embodiment, one or both of the first connecting pipe assembly and the second connecting pipe assembly are provided with an identification mark, and the identification mark is used to distinguish whether the corresponding first connecting pipe assembly and the second connecting pipe assembly are an inlet pipe or an outlet pipe; or, the length of the valve pipe in the first connecting pipe assembly is different from the length of the valve pipe in the second connecting pipe assembly.

[0015] Compared with the prior art, the pipe assembly and the one-way valve provided by the present application facilitate the placement of the welding ring by providing a step portion in the valve pipe, and when the connecting pipe is inserted into the valve pipe, the welding ring is clamped by the end face of the connecting pipe and the step surface of the step portion, so that the welding ring can be fixed between the connecting pipe and the valve pipe. In this way, during subsequent welding, the welding ring can better penetrate into the gap between the connecting pipe and the valve pipe after melting, thereby improving the welding quality of the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1A schematic diagram of the structure of a connecting pipe assembly according to an embodiment of the present application;

[0018] Figure 2 A cross-sectional view of a one-way valve according to an embodiment of the present application;

[0019] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0020] The symbols in the figure mean the following:

[0021] 100, one-way valve; 10, connecting pipe assembly; 11, valve pipe; 111, step portion; 12, connecting pipe; 121, flow channel groove; 122, expansion section; 123, contraction section; 20, valve seat assembly; 201, flow channel; 30, welding ring. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0023] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0025] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are in contact indirectly through an intermediate medium. Moreover, a first feature being “above”, “above”, or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0027] One-way valves are widely used in air conditioning systems. They achieve one-way flow of refrigerant through the active cooperation of the internal diaphragm and the valve seat. The one-way valve also includes a valve pipe and a connecting sleeve. The valve seat is fixed in the valve pipe, and the connecting sleeve is inserted and connected to the valve pipe. The connecting sleeve is used to connect the one-way valve to external components.

[0028] In the related art, the end of the connecting bushing is stamped to form a flange structure that shrinks toward the axial direction, and the solder is accommodated by the accommodating area formed between the flange structure and the inner wall of the valve tube. However, the solder can only be placed in this structure after the connecting bushing is installed, and the solder is not fixed. The solder is easy to move during the welding process, resulting in poor welding performance between the valve tube and the connecting bushing, and reducing the welding qualification rate.

[0029] See also Figure 1-Figure 3 In order to solve the problem of poor welding performance between the valve tube and the connecting bushing of the existing one-way valve, the present application provides a connecting pipe assembly 10, which is mainly used in the one-way valve 100.

[0030] Specifically, the pipe assembly 10 provided in the present application includes a valve pipe 11, a connecting pipe 12, and a welding ring 30. The inner wall of the valve pipe 11 is formed with a step portion 111, the welding ring 30 is placed on the step portion 111, the connecting pipe 12 is inserted into the valve pipe 11 from one end of the valve pipe 11 having the step portion 111, and extends into the valve pipe 11 along with the connecting pipe 12, the connecting pipe 12 can abut against the welding ring 30, and cooperate with the step portion 111 to clamp the welding ring 30.

[0031] It can be understood that by providing the step portion 111 in the valve tube 11, the placement of the welding ring 30 is facilitated, and when the connecting tube 12 is inserted into the valve tube 11, the welding ring 30 is clamped by the end face of the connecting tube 12 and the step surface of the step portion 111, so that the welding ring 30 can be fixed between the connecting tube 12 and the valve tube 11. In this way, during subsequent welding, the welding ring 30 can better penetrate into the gap between the connecting tube 12 and the valve tube 11 after melting, thereby improving the welding quality of the two.

[0032] Specifically, the end of the valve tube 11 can be processed by spinning to make the diameter of the end of the valve tube 11 match the diameter of the connecting tube 12, wherein the connecting tube 12 and the valve tube 11 can be fixed by furnace welding.

[0033] In one embodiment, the valve tube 11 is a stainless steel part, and the connecting tube 12 is a copper part. The price of stainless steel is relatively low, which can effectively reduce the manufacturing cost of the valve tube 11. The connecting tube 12 is mainly used for connecting the valve tube 11 with the air conditioning pipeline. Since the air conditioning pipeline is mostly made of copper, by setting the connecting tube 12 as a copper part, the welding difficulty of the connecting tube 12 and the air conditioning pipeline can be reduced, thereby improving the overall assembly efficiency of the one-way valve 100.

[0034] Of course, in other embodiments, if the air conditioning pipeline is an aluminum pipe, the connecting pipe 12 can also be set as an aluminum part accordingly, as long as it can achieve the same effect of facilitating welding.

[0035] In one embodiment, if Figure 3 As shown, the wall thickness M of the connecting pipe 12 and the cross-sectional width N of the welding ring 30 satisfy, In this way, after the welding ring 30 is melted, it can better penetrate between the outer wall of the connecting pipe 12 and the inner wall of the valve pipe 11, thereby effectively preventing flow welding and further improving the welding qualification rate.

[0036] Specifically, the cross section of the welding ring 30 may be rectangular or circular.

[0037] In order to further improve the reliability of welding between the valve tube 11 and the connecting tube 12, in one embodiment, the inner wall of the valve tube 11 and the outer wall of the connecting tube 12 are interference fit. In this way, the valve tube 11 and the connecting tube 12 can be pre-fixed before welding by interference fit, which is conducive to avoiding welding defects caused by relative movement between the connecting tube 12 and the valve tube 11.

[0038] In one embodiment, if Figure 1 As shown, one or both of the inner wall of the valve tube 11 and the outer wall of the connecting tube 12 are provided with a flow channel 121, and the flow channel 121 is used for solder to flow when the valve tube 11 and the connecting tube 12 are welded, so that the solder can penetrate into between the inner wall of the valve tube 11 and the outer wall of the connecting tube 12 through the flow channel 121.

[0039] That is, the flow channel groove 121 can be formed on the inner wall of the valve tube 11, or on the outer wall of the connecting tube 12, or on both the inner wall of the valve tube 11 and the outer wall of the connecting tube 12. In this way, the welding ring 30 can be filled into the flow channel groove 121 after melting, thereby increasing the reliability of penetration.

[0040] Preferably, the flow channel groove 121 is opened on the outer wall of the connecting pipe 12. Since the connecting pipe 12 is mostly made of copper and other materials, its hardness is relatively low, and the difficulty in processing the flow channel groove 121 is lower, thereby reducing the processing cost.

[0041] Furthermore, in one embodiment, the length of the flow channel groove 121 is greater than or equal to the length of the connecting pipe 12 inserted into the valve pipe 11. In this way, the coverage length of the flow channel groove 121 can be increased, so that the solder can more easily penetrate into the gap between the valve pipe 11 and the connecting pipe 12, thereby further improving the welding strength of the valve pipe 11 and the connecting pipe 12.

[0042] Since the cross section of the existing connection bushing is L-shaped, when the connection bushing is installed in the valve tube 11, except for the end used for limiting, the main part of the connection bushing is basically all inside the valve tube 11. Therefore, when the external pipe fitting is connected to the connection bushing, the external pipe fitting needs to be inserted into the connection bushing. At this time, the welding needs to heat the outside of the valve tube 11, and the thermal conductivity of stainless steel is poor, and the heating time is long. In this way, the risk of thermal impact on other parts in the valve tube 11 increases, and the valve tube 11 is easily cracked due to excessive heating.

[0043] In order to solve the problem of great difficulty in welding the existing connection bushing and the external pipe fitting, in one embodiment of the present application, Figure 1 As shown, the connecting pipe 12 may be arranged to at least partially protrude from the end of the valve pipe 11 , so that the portion of the connecting pipe 12 protruding from the valve pipe 11 can be used to weld with external pipe fittings, thereby reducing the difficulty of welding.

[0044] Specifically, taking the connecting pipe 12 as a copper pipe as an example, copper has good thermal conductivity, and when the external pipe is connected to the connecting pipe 12, it can be inserted or sleeved only on the portion of the connecting pipe 12 outside the valve pipe 11. In this way, when heating for welding, the connecting pipe 12 can be directly heated, and the high thermal conductivity of copper can be used to effectively solve various welding defects caused by the poor heat transfer performance of stainless steel.

[0045] Further, in order to facilitate the connection between the connecting pipe 12 and the external pipe fittings, in one embodiment, as Figure 2 and Figure 3As shown, a flared section 122 may be provided at one end of the connecting pipe 12 away from the valve pipe 11, and the inner diameter of the flared section 122 gradually increases along the axial direction of the connecting pipe 12 and in the direction from the valve pipe 11 to the connecting pipe 12. In this way, the external pipe fitting can be inserted into the connecting pipe 12 and stopped at the inner wall of the flared section 122, so as to achieve a positioning effect through the inner wall of the flared section 122, thereby facilitating subsequent welding.

[0046] In other embodiments, Figure 2 As shown, a constricted section 123 may also be provided at one end of the connecting pipe 12 away from the valve pipe 11, and the inner diameter of the constricted section 123 gradually decreases along the axial direction of the connecting pipe 12 and in the direction from the valve pipe 11 to the connecting pipe 12. In this way, the external pipe fitting may be sleeved on the peripheral side of the connecting pipe 12 and stopped at the outer wall of the constricted section 123, so as to achieve a positioning effect through the outer wall of the constricted section 123, thereby facilitating subsequent welding.

[0047] The diameters of the expanding section 122 and the shrinking section 123 can be reasonably set according to actual connection requirements and are not further limited herein.

[0048] The present application also provides a one-way valve 100 , which includes a valve seat assembly 20 and a connecting pipe assembly 10 of any one of the above embodiments, wherein the end of the valve pipe 11 in the connecting pipe assembly 10 that faces away from the connecting pipe 12 is connected to the valve seat assembly 20 .

[0049] Furthermore, in one embodiment, the number of the connecting pipe assemblies 10 is two, and they are respectively defined as the first connecting pipe assembly and the second connecting pipe assembly, the valve seat assembly 20 has a circulation channel 201, and the opposite ends of the valve seat assembly 20 along the refrigerant circulation direction are respectively connected to the first connecting pipe assembly and the second connecting pipe assembly, and the first connecting pipe assembly is connected to the second connecting pipe assembly through the circulation channel 201. Among them, the valve pipe 11 in the first connecting pipe assembly is the same length as the valve pipe 11 in the second connecting pipe assembly. In this way, the valve seat assembly 20 is arranged in the middle of the valve body, which can reduce the heat effect on the valve seat assembly 20 when the valve pipe 11 and the connecting pipe 12 are welded, thereby improving the reliability of the valve seat assembly 20.

[0050] Since the refrigerant in the one-way valve 100 can only flow in a single direction and cannot flow in the opposite direction, the installation of the one-way valve 100 requires a clear distinction between its inlet and outlet ends to prevent the one-way valve 100 from not working properly when it is installed in reverse. Based on this, in order to distinguish the inlet and outlet ends of the one-way valve 100, in one embodiment, the length of the valve pipe 11 in the first connecting pipe assembly and the length of the valve pipe 11 in the second connecting pipe assembly can be set to be different, so as to distinguish whether the corresponding valve pipe 11 is an inlet pipe or an outlet pipe by the difference in pipe length.

[0051] For example, the longer of the two valve pipes 11 can be set as the inlet pipe, and the shorter one can be set as the outlet pipe. Alternatively, the longer one can be set as the outlet pipe, and the shorter one can be set as the inlet pipe.

[0052] In another embodiment, a mark (not shown) may be provided on one or both of the first connecting pipe assembly and the second connecting pipe assembly, and the mark is used to distinguish whether the corresponding first connecting pipe assembly and the second connecting pipe assembly are inlet pipes or outlet pipes. By providing the mark, the inlet and outlet of the one-way valve 100 can be more clearly distinguished to prevent misinstallation and improve safety.

[0053] Of course, in other embodiments, the pipe assembly 10 may also be provided with two connecting pipes 12, and the valve pipe 11 may be provided as an integrated structure, and both opposite ends of the valve pipe 11 may be spun to be respectively connected with the two connecting pipes 12. In this case, the valve seat assembly 20 may be installed in the valve pipe 11, and disposed in the middle of the valve pipe 11, and fixedly connected with the valve pipe 11 by means of necking, etc., so as to reduce the heat effect of welding on the valve seat assembly 20, and ensure the performance of the one-way valve 100.

[0054] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A pipe connection assembly, characterized in that: The connecting pipe assembly comprises a valve pipe (11), a connecting pipe (12) and a welding ring (30); the inner wall of the valve pipe (11) is formed with a step portion (111); The welding ring (30) is placed on the step portion (111), and the connecting pipe (12) is inserted into the valve pipe (11) from one end of the valve pipe (11) provided with the step portion (111), and extends into the valve pipe (11) along with the connecting pipe (12). The connecting pipe (12) can abut against the welding ring (30) and cooperate with the step portion (111) to clamp the welding ring (30).

2. The pipe assembly according to claim 1, characterized in that: The wall thickness M of the connecting pipe (12) and the cross-sectional width N of the welding ring (30) satisfy:

3. The pipe assembly according to claim 1, characterized in that: The inner wall of the valve tube (11) and the outer wall of the connecting tube (12) are interference fit.

4. The pipe assembly according to claim 1, characterized in that: One or both of the inner wall of the valve tube (11) and the outer wall of the connecting tube (12) is provided with a flow channel (121), and the flow channel (121) is used to allow solder to flow when the valve tube (11) and the connecting tube (12) are welded, so that the solder can penetrate between the inner wall of the valve tube (11) and the outer wall of the connecting tube (12) through the flow channel (121).

5. The pipe assembly according to claim 4, characterized in that: The length of the flow channel groove (121) is greater than or equal to the length of the connecting pipe (12) inserted into the valve pipe (11).

6. The connecting pipe assembly according to claim 1, characterized in that: An end of the connecting pipe (12) away from the valve pipe (11) is provided with a flared section (122), and the inner diameter of the flared section (122) gradually increases along the axial direction of the connecting pipe (12) and in the direction from the valve pipe (11) to the connecting pipe (12); Alternatively, a tapered section (123) is provided at one end of the connecting tube (12) away from the valve tube (11), and the inner diameter of the tapered section (123) gradually decreases along the axial direction of the connecting tube (12) and in the direction from the valve tube (11) to the connecting tube (12).

7. The pipe assembly according to claim 1, characterized in that: The valve pipe (11) is a stainless steel part, and the connecting pipe (12) is a copper part.

8. A one-way valve, characterized in that: It comprises a valve seat assembly (20) and a connecting pipe assembly as claimed in any one of claims 1 to 7, wherein one end of the valve pipe (11) in the connecting pipe assembly which faces away from the connecting pipe (12) is connected to the valve seat assembly (20).

9. The one-way valve according to claim 8, characterized in that: The number of the connecting pipe components is two, and they are defined as a first connecting pipe component and a second connecting pipe component respectively. The valve seat assembly (20) has a circulation channel (201), and the two opposite ends of the valve seat assembly along the refrigerant circulation direction are respectively connected to the first connecting pipe assembly and the second connecting pipe assembly, and the first connecting pipe assembly is connected to the second connecting pipe assembly through the circulation channel (201); The valve tube (11) in the first connecting pipe assembly and the valve tube (11) in the second connecting pipe assembly have the same length.

10. The one-way valve according to claim 9, characterized in that: One or both of the first connecting pipe assembly and the second connecting pipe assembly are provided with an identification mark, and the identification mark is used to distinguish whether the corresponding first connecting pipe assembly and the second connecting pipe assembly are an inlet pipe or an outlet pipe; Alternatively, the length of the valve tube (11) in the first connecting pipe assembly is different from the length of the valve tube (11) in the second connecting pipe assembly.

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