Valve seat assembly and electronic expansion valve

Abstract

The utility model relates to the technical field of expansion valve machining, in particular to a valve seat assembly and an electronic expansion valve. The valve seat assembly comprises a main valve seat, an auxiliary valve seat and a connecting pipe. The main valve seat is provided with a circulation cavity and a communicating hole. The connecting pipe penetrates through and is connected to the communicating hole, the auxiliary valve seat is arranged in the circulating cavity, a valve port corresponding to the communicating hole is formed in the auxiliary valve seat, and the connecting pipe is communicated with the circulating cavity through the valve port. A receding groove is formed between the main valve seat and the auxiliary valve seat, at least part of the connecting pipe extends into the receding groove, and the peripheral side of the connecting pipe and the groove wall of the receding groove are arranged at intervals to form a receding gap. According to the valve seat assembly and the electronic expansion valve, the problem that when an existing connecting pipe is integrally welded to the valve seat and the valve seat element at a high temperature, a valve port deforms is solved.

Description

Technical Field

[0001] The present application relates to the technical field of expansion valve processing, and particularly relates to a valve seat assembly and an electronic expansion valve. Background Art

[0002] The valve seat component of an electronic expansion valve often includes a valve seat, a valve seat core, and a connecting pipe. The valve seat core is installed on the valve seat, a part of the connecting pipe is inserted into the valve seat core and fixedly connected to the valve seat, and the connecting pipe communicates with the valve port on the valve seat core. Among them, the valve seat, the valve seat core, and the connecting pipe are often fixedly welded together after assembly. However, since the high temperature during welding will cause the valve port on the valve seat core to deform, the valve port accuracy will be reduced, so it is difficult to ensure the consistency of the flow rate. Summary of the Utility Model

[0003] Based on this, it is necessary to provide a valve seat assembly and an electronic expansion valve to solve the problem that the valve port will be deformed when the existing connecting pipe is integrally welded with the valve seat and the valve seat core at high temperature.

[0004] The present application provides a valve seat assembly, which includes a main valve seat, a sub-valve seat, and a connecting pipe. The main valve seat is provided with a flow cavity and a communication hole communicating with the flow cavity; the connecting pipe penetrates and is connected to the communication hole, the sub-valve seat is installed in the flow cavity, and a valve port corresponding to the communication hole is provided on the sub-valve seat, and the connecting pipe communicates with the flow cavity through the valve port; wherein, an avoidance groove is formed between the main valve seat and the sub-valve seat, at least part of the connecting pipe extends into the avoidance groove, and along the radial direction of the sub-valve seat, a circumferential side of the connecting pipe is spaced from a groove wall of the avoidance groove to form an avoidance gap.

[0005] In one embodiment, along the radial direction of the sub-valve seat, the width of the avoidance gap is greater than or equal to 0.5 mm; and / or, along the axial direction of the sub-valve seat, the length of the avoidance gap is greater than or equal to 0.5 mm.

[0006] In one embodiment, along the axial direction of the sub-valve seat, the bottom of the flow cavity is recessed towards the direction close to the communication hole to form the avoidance groove; or, an end face of the sub-valve seat close to the communication hole is recessed towards the direction away from the communication hole to form the avoidance groove; or, a first sub-groove is provided at the bottom of the flow cavity, a second sub-groove is provided on the sub-valve seat, and the first sub-groove and the second sub-groove are correspondingly arranged and enclose to form the avoidance groove.

[0007] In one embodiment, a receiving groove is formed at the bottom of the flow cavity, and at least part of the sub-valve seat is installed in the receiving groove; wherein, an outer wall of at least part of the sub-valve seat installed in the receiving groove is in interference fit with an inner wall of the receiving groove.

[0008] In one embodiment, the secondary valve seat is in abutting fit with the bottom of the receiving groove, and the depth of the secondary valve seat inserted into the receiving groove is greater than or equal to half of the outer diameter of the secondary valve seat.

[0009] In one embodiment, a welding groove is formed at one end of the flow passage cavity away from the communication hole in the receiving groove. The welding groove is spaced from the bottom wall of the receiving groove and the end face of the secondary valve seat away from the connecting pipe in the axial direction of the secondary valve seat. And, the projection of the side wall of the welding groove along the radial direction of the secondary valve seat at least partially coincides with the secondary valve seat; wherein, the welding groove is used for laser welding of the secondary valve seat and the main valve seat.

[0010] In one embodiment, the end face of the secondary valve seat close to the connecting pipe is spaced from the end of the connecting pipe.

[0011] In one embodiment, the outer wall of the connecting pipe and the inner wall of the communication hole are in interference fit.

[0012] In one embodiment, both the main valve seat and the secondary valve seat are made of stainless steel.

[0013] The present application also provides an electronic expansion valve, which includes the valve seat assembly described in any one of the above embodiments.

[0014] Compared with the prior art, for the valve seat assembly and the electronic expansion valve provided by the present application, when assembling the valve seat assembly, first pass the connecting pipe through the communication hole on the main valve seat, and then weld and fix the main valve seat and the connecting pipe with solder. If the solder is provided outside the main valve seat, due to capillary action, part of the melted solder during the welding of the main valve seat and the connecting pipe will flow through the gap between the outer wall of the connecting pipe and the inner wall of the communication hole, and this part of the solder will spread and accumulate on the periphery of the part of the connecting pipe inserted into the main valve seat. And when the solder is provided inside the main valve seat, solder also accumulates on the periphery of the part of the connecting pipe inside the main valve seat after welding. Based on this, the present application forms an avoidance gap by providing an avoidance groove between the main valve seat and the secondary valve seat and surrounding the end of the connecting pipe with the avoidance groove, so that this solder can be accommodated by the avoidance gap, thereby avoiding the influence of the solder on the assembly of the secondary valve seat. It can be understood that since the valve port is provided on the secondary valve seat and the secondary valve seat does not participate in the welding between the main valve seat and the connecting pipe, the valve port can be prevented from being deformed by the welding high temperature, thus greatly ensuring the accuracy of the valve port, and further effectively ensuring the correctness and consistency of the product flow rate. Description of the Drawings

[0015] To more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 A cross-sectional view of a valve seat assembly according to an embodiment provided by the present application;

[0017] Figure 2 An exploded cross-sectional view of a valve seat assembly according to an embodiment provided by the present application.

[0018] The meanings of the symbols in the figure are as follows:

[0019] 100, valve seat assembly; 10, main valve seat; 101, flow cavity; 1011, receiving groove; 102, communication hole; 103, solder receiving area; 104, relief groove; 1041, first sub-groove; 1042, second sub-groove; 105, relief gap; 106, solder groove; 20, sub-valve seat; 201, valve port; 30, connecting pipe. Detailed implementation manners

[0020] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will make a detailed description of the specific implementation manners of the present application with reference to the drawings. Many specific details are set forth in the following description to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0021] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the description of the present application are only for the purpose of illustration and do not represent the only implementation manner.

[0022] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0023] In this application, unless otherwise clearly stipulated and defined, the first feature being "on" or "under" the second feature may mean that the first feature is in direct contact with the second feature, or the first feature is indirectly in contact with the second feature through an intermediate medium. Moreover, the first feature being "above", "over" or "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" or "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is lower than that of the second feature.

[0024] Unless otherwise defined, all technical and scientific terms used in the description of this application have the same meaning as commonly understood by those skilled in the technical field to which this application pertains. The terms used in the description 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 description of this application includes any and all combinations of one or more of the related listed items.

[0025] Please refer to Figure 1 and Figure 2 , this application provides a valve seat assembly 100, which is mainly applied to an electronic expansion valve to solve the problem that the valve port 201 will be deformed when the existing connecting pipe is integrally and thermally welded to the valve seat and the valve seat core. Among them, the electronic expansion valve further includes a valve core, and the valve core can be movably matched with the valve seat assembly 100 to adjust the refrigerant flow rate or play a role in throttling and reducing pressure.

[0026] Please continue to refer to Figure 1 and Figure 2 , the valve seat assembly 100 provided by this application includes a main valve seat 10, a sub-valve seat 20 and a connecting pipe 30. The main valve seat 10 is provided with a flow cavity 101 and a communication hole 102 communicating with the flow cavity 101. The connecting pipe 30 penetrates and is connected to the communication hole 102. The sub-valve seat 20 is installed in the flow cavity 101, and a valve port 201 corresponding to the communication hole 102 is provided on the sub-valve seat 20. The valve port 201 and the communication hole 102 are coaxially arranged, and the connecting pipe 30 communicates with the flow cavity 101 through the valve port 201. Among them, an avoidance groove 104 is formed between the main valve seat 10 and the sub-valve seat 20. At least part of the connecting pipe 30 extends into the avoidance groove 104, and along the radial direction of the sub-valve seat 20, a circumferential side of the connecting pipe 30 is spaced from the groove wall of the avoidance groove 104 to form an avoidance gap 105, and the avoidance gap 105 is used to accommodate the solder that seeps into the avoidance gap 105 through the gap between the connecting pipe 30 and the communication hole 102.

[0027] When the valve seat assembly 100 provided in the present application is assembled, first pass the connecting pipe 30 through the communication hole 102 on the main valve seat 10, and then weld and fix the main valve seat 10 and the connecting pipe 30 with solder. If the solder is arranged outside the main valve seat 10, due to capillary action, part of the melted solder during the welding of the main valve seat 10 and the connecting pipe 30 will flow through the gap between the outer wall of the connecting pipe 30 and the inner wall of the communication hole 102, and this part of the solder will spread and accumulate on the periphery of the part of the connecting pipe 30 inserted into the main valve seat 10. When the solder is arranged inside the main valve seat 10, solder also accumulates on the periphery of the part of the connecting pipe 30 inside the main valve seat 10 after welding. Based on this, the present application forms an avoidance groove 104 between the main valve seat 10 and the sub-valve seat 20, and the avoidance groove 104 surrounds the periphery of the end of the connecting pipe 30 to form an avoidance gap 105. In this way, the avoidance gap 105 can be used to accommodate the solder, thereby avoiding the influence of the solder on the assembly of the sub-valve seat 20.

[0028] It can be understood that since the valve port 201 is opened on the sub-valve seat 20 and the sub-valve seat 20 does not participate in the welding between the main valve seat 10 and the connecting pipe 30, the valve port 201 can be avoided from being deformed due to the influence of the welding high temperature, thus greatly ensuring the accuracy of the valve port 201, and further effectively ensuring the correctness and consistency of the product flow rate.

[0029] Specifically, a solder accommodating area 103 can be formed between the main valve seat 10 and the connecting pipe 30. The solder accommodating area 103 is used to place solder to weld the connecting pipe 30 to the main valve seat 10 by furnace welding. Here, the solder accommodating area 103 can be as Figure 1 shown, formed by clamping the side wall of the connecting pipe 30 outside the main valve seat 10 and the outer wall of the main valve seat 10. Or, it is formed by clamping the side wall of the connecting pipe 30 inside the main valve seat 10 and the inner wall of the main valve seat 10, that is, the position of the above-mentioned avoidance groove 104.

[0030] Furthermore, in an embodiment, the outer wall of the connecting pipe 30 and the inner wall of the communication hole 102 are in interference fit. In this way, the positioning between the connecting pipe 30 and the main valve seat 10 can be realized, the coaxiality between the connecting pipe 30 and the main valve seat 10 can be improved, so as to facilitate subsequent welding, and the connection strength between the connecting pipe 30 and the main valve seat 10 is greatly improved.

[0031] In a specific embodiment of the present application, as Figure 1 and Figure 2 shown, a first sub-groove 1041 is opened at the bottom of the flow cavity 101, and the sub-valve seat 20 is provided with a second sub-groove 1042. The first sub-groove 1041 and the second sub-groove 1042 are correspondingly arranged and surround to form the avoidance groove 104. By forming the avoidance groove 104 structure through the cooperation of the main valve seat 10 and the sub-valve seat 20, the processing is relatively simple.

[0032] However, without limitation, in other embodiments, along the axial direction of the auxiliary valve seat 20, an avoidance groove 104 may also be formed by the bottom of the flow cavity 101 being recessed towards the communication hole 102, or by the end face of the auxiliary valve seat 20 close to the communication hole 102 being recessed away from the communication hole 102. That is, the avoidance groove 104 may also be only formed on the main valve seat 10 or the auxiliary valve seat 20, and it is also easy to process and form.

[0033] For ease of explanation, this application only takes the example of a first sub-groove 1041 being formed on the main valve seat 10, a second sub-groove 1042 being formed on the auxiliary valve seat 20, and the first sub-groove 1041 and the second sub-groove 1042 cooperating to form the avoidance groove 104 structure for illustration.

[0034] In one embodiment, along the radial direction of the auxiliary valve seat 20, the width of the avoidance gap 105 is greater than or equal to 0.5 mm. In this way, the avoidance gap 105 has enough radial space to accommodate the solder infiltrated into it, so as to further reduce the influence on the assembly of the auxiliary valve seat 20.

[0035] Further, in one embodiment, along the axial direction of the auxiliary valve seat 20, the length of the avoidance gap 105 is greater than or equal to 0.5 mm. In this way, the avoidance gap 105 has enough axial space to accommodate the solder infiltrated into it, so as to further reduce the influence on the assembly of the auxiliary valve seat 20.

[0036] Optionally, the width of the avoidance gap 105 along the radial direction of the auxiliary valve seat 20 can be 0.5 mm, 0.52 mm, 0.54 mm, 0.56 mm, 0.58 mm or 0.6 mm, etc., and the length of the avoidance gap 105 along the axial direction of the auxiliary valve seat 20 can be 0.5 mm, 0.52 mm, 0.54 mm, 0.56 mm, 0.58 mm or 0.6 mm, etc. Specifically, it can be reasonably set according to actual needs and will not be listed one by one here.

[0037] In one embodiment, as Figure 2 shown, a receiving groove 1011 is formed at the bottom of the flow cavity 101, and at least part of the auxiliary valve seat 20 is installed in the receiving groove 1011. Among them, the outer wall of at least part of the auxiliary valve seat 20 installed in the receiving groove 1011 is in interference fit with the inner wall of the receiving groove 1011.

[0038] The receiving groove 1011 can position the auxiliary valve seat 20 and facilitate the installation of the auxiliary valve seat 20. And the interference fit between at least part of the auxiliary valve seat 20 installed in the receiving groove 1011 and the receiving groove 1011 can improve the coaxiality between the two and realize the firm installation of the auxiliary valve seat 20.

[0039] Further, in one embodiment, as Figure 1As shown, the secondary valve seat 20 is in abutting fit with the bottom of the receiving groove 1011, and the depth at which the secondary valve seat 20 is inserted into the receiving groove 1011 is greater than or equal to half of the outer diameter of the secondary valve seat 20. In this way, the axial contact area between the secondary valve seat 20 and the receiving groove 1011 can be effectively ensured, and the coaxiality between the two can be further improved.

[0040] In one embodiment, as Figure 1 and Figure 2 shown, a welding groove 106 is formed at one end of the flow chamber 101 away from the communication hole 102 in the receiving groove 1011, and there is a gap between the bottom wall of the welding groove 106 near one end of the receiving groove 1011 and the end face of the secondary valve seat 20 away from the connecting pipe 30 in the axial direction of the axis of the secondary valve seat 20. And, the projection of the side wall of the welding groove 106 in the radial direction of the secondary valve seat 20 coincides with at least a part of the secondary valve seat 20. Among them, the welding groove 106 is used for laser welding of the secondary valve seat 20 and the main valve seat 10. In this way, the connection strength between the main valve seat 10 and the secondary valve seat 20 can be further improved. And, the position of the laser welding is located at the outer edge of the secondary valve seat 20, far from the valve port 201, so that the thermal influence on the valve port 201 can be reduced, and the forming accuracy of the valve port 201 can be further ensured.

[0041] To reduce the fitting difficulty among multiple components when the secondary valve seat 20 is press-fitted into the receiving groove 1011, in one embodiment, the end face of the secondary valve seat 20 near the connecting pipe 30 is spaced from the end of the connecting pipe 30. That is, the secondary valve seat 20 does not abut against the main valve seat 10 and the connecting pipe 30 at the same time, avoiding overdefinition.

[0042] In one embodiment, the main valve seat 10 and the secondary valve seat 20 are made of stainless steel. The cost of stainless steel is relatively low, which can reduce the overall cost of the valve seat assembly 100.

[0043] Specifically, the main valve seat 10 and the secondary valve seat 20 can be formed by stretching, precision machining, cold heading of stainless steel materials or a combination of the above processing methods, while the avoidance groove 104 can be formed by turning and precision machining.

[0044] This application also provides an electronic expansion valve, which includes the valve seat assembly 100 of any one of the above embodiments.

[0045] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0046] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patented application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the patent protection scope of the present application shall be subject to the appended claims.

Claims

1. A valve seat assembly, characterized in that, It includes a main valve seat (10), a sub-valve seat (20) and a connecting pipe (30). The main valve seat (10) is provided with a flow cavity (101) and a communication hole (102) communicating with the flow cavity (101). The connecting pipe (30) penetrates and is connected to the communication hole (102). The sub-valve seat (20) is installed in the flow cavity (101), and a valve port (201) corresponding to the communication hole (102) is provided on the sub-valve seat (20). The connecting pipe (30) communicates with the flow cavity (101) through the valve port (201). Wherein, an avoidance groove (104) is formed between the main valve seat (10) and the sub-valve seat (20). At least part of the connecting pipe (30) extends into the avoidance groove (104). Along the radial direction of the sub-valve seat (20), a circumferential side of the connecting pipe (30) is spaced from a groove wall of the avoidance groove (104) to form an avoidance gap (105).

2. The valve seat assembly according to claim 1, wherein, Along the radial direction of the sub-valve seat (20), the width of the avoidance gap (105) is greater than or equal to 0.5 mm. And / or, along the axial direction of the sub-valve seat (20), the length of the avoidance gap (105) is greater than or equal to 0.5 mm.

3. The valve seat assembly according to claim 1, characterized in that, Along the axial direction of the sub-valve seat (20), a bottom of the flow cavity (101) is recessed towards the direction close to the communication hole (102) to form the avoidance groove (104). Or, an end face of the sub-valve seat (20) close to the communication hole (102) is recessed towards the direction away from the communication hole (102) to form the avoidance groove (104). Or, a first sub-groove (1041) is provided at a bottom of the flow cavity (101), and a second sub-groove (1042) is provided on the sub-valve seat (20). The first sub-groove (1041) and the second sub-groove (1042) are correspondingly arranged and enclose to form the avoidance groove (104).

4. The valve seat assembly according to claim 1, characterized in that, A receiving groove (1011) is formed at a bottom of the flow cavity (101). At least part of the sub-valve seat (20) is installed in the receiving groove (1011). Wherein, an outer wall of the sub-valve seat (20) at least partly installed in the receiving groove (1011) is in interference fit with an inner wall of the receiving groove (1011).

5. The valve seat assembly according to claim 4, wherein, The sub-valve seat (20) is in abutting fit with a bottom of the receiving groove (1011), and a depth of the sub-valve seat (20) inserted into the receiving groove (1011) is greater than or equal to half of an outer diameter of the sub-valve seat (20).

6. The valve seat assembly according to claim 4, characterized in that, A welding groove (106) is formed at an end of the flow cavity (101) away from the communication hole (102) of the receiving groove (1011). A bottom wall of the welding groove (106) close to the receiving groove (1011) and an end face of the sub-valve seat (20) away from the connecting pipe (30) have a gap in an axial direction of the sub-valve seat (20). And, a projection of a side wall of the welding groove (106) along the radial direction of the sub-valve seat (20) at least partly coincides with the sub-valve seat (20). Among them, the welding groove (106) is used for laser welding of the auxiliary valve seat (20) and the main valve seat (10).

7. The valve seat assembly according to claim 1, characterized in that One end face of the auxiliary valve seat (20) close to the connecting pipe (30) is arranged at an interval from the end of the connecting pipe (30).

8. The valve seat assembly according to claim 1, characterized in that The outer wall of the connecting pipe (30) and the inner wall of the communication hole (102) are in interference fit.

9. The valve seat assembly according to claim 1, wherein, Both the main valve seat (10) and the auxiliary valve seat (20) are made of stainless steel.

10. An electronic expansion valve, characterized in that, It includes the valve seat assembly according to any one of claims 1-9.

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