Electronic expansion valve

Abstract

The utility model relates to the technical field of expansion valves, in particular to an electronic expansion valve. The electronic expansion valve comprises a mounting base, a valve body and a valve needle assembly. A mounting cavity is formed in the mounting seat, at least part of the valve body is arranged in the mounting cavity, the valve body is provided with a valve cavity and a valve port communicated with the valve cavity, and the valve needle assembly is movably arranged in the valve cavity so as to open or close the valve port. The valve body comprises a first valve body, the first valve body comprises a guide section, the inner wall of at least part of the guide section and the outer wall, opposite to the guide section, of the first valve body are of an integrated structure, and the outer side wall of the valve needle assembly and the inner wall of the guide section make direct contact and are in guide fit. Wherein a throttling section is arranged at the end, close to the valve port, of the valve needle assembly, and when the electronic expansion valve is in a throttling mode, at least part of the throttling section stretches into the valve port and is matched with the valve port so as to adjust the flow of the valve port. According to the electronic expansion valve and the air conditioning system, the problem that when a valve port of an existing electronic expansion valve is large, the flow adjusting precision is prone to being insufficient is solved.

Description

Technical Field

[0001] The present application relates to the technical field of expansion valves, and in particular to an electronic expansion valve. Background Art

[0002] Electronic expansion valves are commonly used in air conditioning systems to throttle, reduce pressure, and regulate flow. Currently, to meet the higher flow demands of air conditioning systems, electronic expansion valves with large valve openings are often used.

[0003] However, when designing large-diameter electronic expansion valves, the valve needle is often only considered to have the function of closing the valve port, while ignoring the flow regulation function of the valve needle. This leads to insufficient flow regulation performance of large-diameter electronic expansion valves, making it difficult to meet the environment requiring high-precision flow regulation, and reducing the performance of the electronic expansion valve. Utility Model Content

[0004] Based on this, it is necessary to provide an electronic expansion valve to solve the problem that the flow regulation accuracy of the existing electronic expansion valve is insufficient when the valve port is large.

[0005] The present application provides an electronic expansion valve, which includes a mounting seat, a valve body and a valve needle assembly, the mounting seat having a mounting cavity, at least a portion of the valve body being arranged in the mounting cavity, the valve body having a valve cavity and a valve port connected to the valve cavity, and the valve needle assembly being movably arranged in the valve cavity to open or close the valve port; the valve body includes a first valve body connected to the mounting seat, the first valve body including a guide section, at least a portion of the inner wall of the guide section and the outer wall of the first valve body opposite to it forming an integral structure, the outer side wall of the valve needle assembly directly contacts and guides the inner wall of the guide section; wherein, a throttling section is provided at one end of the valve needle assembly close to the valve port, the electronic expansion valve has a throttling mode, and when the electronic expansion valve is in the throttling mode, at least a portion of the throttling section extends into the valve port and cooperates with the valve port to adjust the flow of the valve port.

[0006] In one embodiment, the electronic expansion valve further includes a first sealing member and a second sealing member, wherein the first sealing member is connected to the valve needle assembly, and the second sealing member is disposed between the first sealing member and the valve needle assembly.

[0007] In one embodiment, the first sealing member and the second sealing member are separately provided, and the second sealing member is in sealing contact with the first sealing member and the valve needle assembly respectively, wherein the first sealing member is in sealing cooperation with the valve port.

[0008] In one embodiment, the valve needle assembly includes a protrusion at least partially embedded in the interior of the first sealing member, wherein the protrusion is the second sealing member, and the first sealing member is sealingly engaged with the valve port.

[0009] In one embodiment, the electronic expansion valve further includes a first seal, which is sealed with the valve port; the valve needle assembly includes a first valve needle segment and a second valve needle segment, at least a portion of the second valve needle segment is installed at one end of the first valve needle segment and forms a first installation groove with the first valve needle segment, and the first seal is installed in the first installation groove.

[0010] In one embodiment, the first valve needle section includes a valve needle body and a connecting column, and the connecting column is connected to one end of the valve needle body; the second valve needle section includes a throttle ring, and the throttle ring is sleeved on the circumference of the connecting column and abuts against the valve needle body, wherein the throttle section is provided on the throttle ring, and the first mounting groove is formed between the valve needle body and the throttle ring.

[0011] In one embodiment, the valve needle body or the second valve needle segment is provided with a second mounting groove, and the second mounting groove is communicated with the first mounting groove; the electronic expansion valve further includes a second sealing member, which is installed in the second mounting groove and is located between the first sealing member and the valve needle body.

[0012] In one embodiment, the first valve needle segment is provided with an assembly cavity, at least a portion of the second valve needle segment is located in the assembly cavity, one end of the second valve needle segment is spaced apart from one end of the first valve needle segment, and one end of the second valve needle segment and one end of the first valve needle segment are clamped to form the first mounting groove; wherein the throttling section is provided at one end of the second valve needle segment.

[0013] In one embodiment, the electronic expansion valve also includes a second sealing member, the first valve needle segment and the second valve needle segment form a second mounting groove, the second mounting groove is communicated with the first mounting groove, and the second sealing member is installed in the second mounting groove; or, the first valve needle segment has a second mounting groove, the second mounting groove is communicated with the first mounting groove, and the second sealing member is installed in the second mounting groove; or, the second valve needle segment has a second mounting groove, the second mounting groove is communicated with the first mounting groove, and the second sealing member is installed in the second mounting groove.

[0014] In one embodiment, a third mounting groove is formed between the other end of the second valve needle segment and the other end of the first valve needle segment; the electronic expansion valve also includes an elastic member, and along the axial direction of the valve needle assembly, one end of the elastic member abuts against the third mounting groove, and the other end abuts against the valve body.

[0015] In one embodiment, the openings at both ends of the elastic member are of equal size, and the outer ring of the elastic member is in contact with and guide-fitted against the inner wall of the first valve needle segment.

[0016] In one embodiment, the opening size of one end of the elastic member is smaller than the opening size of the other end, and the inner ring of the other end of the elastic member is in contact with the outer wall of the second valve needle segment.

[0017] In one embodiment, the electronic expansion valve further includes a screw, the second valve needle section includes a second valve needle body and a spring sleeve, and the screw, the spring sleeve and the second valve needle body are connected in sequence; wherein the inner ring of the other end of the elastic member is in contact with the outer wall of the second valve needle body.

[0018] In one embodiment, a welding groove is formed on the outer side wall of the first valve needle segment, and the first valve needle segment is welded to the second valve needle segment through the welding groove.

[0019] In one embodiment, the inner wall of the assembly cavity includes a first connecting section, the first connecting section is located on a side of the welding groove away from the valve port, and the first connecting section is interference fit with the second valve needle section.

[0020] In one embodiment, the inner wall of the assembly cavity also includes a second connecting section, which is located on the side of the welding groove close to the valve port, and the second connecting section is gap-fitted with the second valve needle section; wherein, the second connecting section and the first connecting section are respectively located on both sides of the welding groove along the axial direction of the electronic expansion valve.

[0021] In one embodiment, the electronic expansion valve further includes a screw connected to an end of the second valve needle segment away from the first sealing member.

[0022] In one embodiment, the valve body further includes a second valve body that is separate from the first valve body, and the valve port is located in the second valve body; wherein the first valve body further includes a flow port that communicates with the valve cavity.

[0023] In one embodiment, the valve body further includes a second valve body that is separate from the first valve body, and the valve port is located in the second valve body; wherein the second valve body is further provided with a flow port that communicates with the valve cavity.

[0024] Compared with the prior art, the electronic expansion valve provided by the present application is fixedly connected to the outside world through a mounting seat, thereby facilitating the assembly of the electronic expansion valve. In addition, by setting the inner wall of at least part of the guide section and the outer wall of the first valve body opposite to it as an integral structure, that is, the first valve body has no other structural components at the position of the guide section, and by making the outer wall of the valve needle assembly directly contact and guide the inner wall of the guide section on the first valve body, it can fully ensure that the size of the valve needle assembly along its own radial direction is large enough, thereby facilitating the matching between the valve needle assembly and the large-diameter valve port, which is conducive to the setting of a large-diameter valve port. In addition, by setting a throttling section at one end of the valve needle assembly, the valve needle assembly can form channels with different flow areas between the throttling section and the valve port by controlling the distance that the throttling section extends into the valve port, thereby achieving flow regulation of the valve port. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. 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.

[0026] Figure 1 A cross-sectional view of an electronic expansion valve according to an embodiment of the present application;

[0027] Figure 2 A partial structural cross-sectional view of an electronic expansion valve according to another embodiment of the present application;

[0028] Figure 3 A cross-sectional view of an electronic expansion valve according to another embodiment of the present application;

[0029] Figure 4 A partial structural cross-sectional view of an electronic expansion valve according to another embodiment of the present application.

[0030] The symbols in the figure mean the following:

[0031] 100, electronic expansion valve; 10, valve body; 101, valve chamber; 1011, back pressure chamber; 102, valve port; 103, flow port; 11, first valve body; 111, guide section; 12, second valve body; 13, valve seat ring; 20, valve sleeve; 30, valve needle assembly; 301, throttling section; 302, first mounting groove; 303, second mounting groove; 304, third mounting groove; 305, balancing channel; 31, first valve needle section; 3101, assembly Cavity; 3101a, first connecting section; 3101b, second connecting section; 3102, welding groove; 311, valve needle body; 312, connecting column; 32, second valve needle section; 321, throttling ring; 322, second valve needle body; 323, spring sleeve; 33, protrusion; 40, first sealing member; 50, second sealing member; 60, mounting seat; 61, mounting cavity; 70, elastic member; 80, drive assembly; 81, screw; 90, third sealing member. DETAILED DESCRIPTION

[0032] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0033] 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 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.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0035] In this application, unless otherwise expressly specified or 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 that the first feature and the second feature are indirectly in contact through an intermediate medium. Furthermore, 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.

[0036] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as 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 of the relevant listed items.

[0037] See also Figures 1-4 The present application provides an electronic expansion valve 100. The electronic expansion valve 100 includes a mounting base 60, a valve body 10, a valve sleeve 20, and a valve needle assembly 30. The mounting base 60 defines a mounting cavity 61, and at least a portion of the valve body 10 is disposed within the mounting cavity 61. The mounting base 60 serves as a mounting support for the valve body 10. Specifically, the mounting base 60 provides a fixed connection between the electronic expansion valve 100 and the outside world, thereby facilitating assembly of the electronic expansion valve 100.

[0038] Furthermore, the valve body 10 defines a valve cavity 101 and a valve port 102 communicating with the valve cavity 101. The valve needle assembly 30 is movably disposed within the valve cavity 101 to open or close the valve port 102. The valve body 10 includes a first valve body 11 connected to the mounting seat 60. The outer wall of the first valve body 11 can be directly connected to the mounting seat 60, and one end of the first valve body 11 is connected to the valve sleeve 20. The first valve body 11 includes a guide section 111. At least a portion of the inner wall of the guide section 111 is integrally formed with the outer wall of the first valve body 11 opposite thereto. The outer wall of the valve needle assembly 30 directly contacts and guides the inner wall of the guide section 111. Among them, a throttling section 301 is provided at one end of the valve needle assembly 30 close to the valve port 102. The electronic expansion valve 100 has a throttling mode. When the electronic expansion valve 100 is in the throttling mode, at least part of the throttling section 301 extends into the valve port 102 and cooperates with the valve port 102 to adjust the flow of the valve port 102.

[0039] It is understandable that the present application provides an integral structure between at least a portion of the inner wall of the guide section 111 and the outer wall of the first valve body 11 opposite thereto, that is, the first valve body 11 has no other structural components at the location of the guide section 111, and by making the outer side wall of the valve needle assembly 30 directly contact and guide the inner wall of the guide section 111 on the first valve body 11, it is possible to fully ensure that the radial dimension of the valve needle assembly 30 is sufficiently large, thereby facilitating the fit between the valve needle assembly 30 and the large-diameter valve port 102, which is conducive to the provision of a large-diameter valve port 102. Furthermore, the present application provides a throttling section 301 at one end of the valve needle assembly 30, and the valve needle assembly 30 can control the distance that the throttling section 301 extends into the valve port 102, so that channels with different flow areas are formed between the throttling section 301 and the valve port 102, thereby achieving flow regulation of the valve port 102.

[0040] Specifically, the throttle section 301 is tapered. The valve port 102 includes a straight section of constant diameter. As the valve needle assembly 30 moves away from the valve port 102, the gap between the throttle section 301 and the straight section gradually increases, and the flow rate increases accordingly, until the valve port 102 is fully opened.

[0041] It should be noted that, since the valve port 102 of the large-diameter electronic expansion valve 100 of the present application has a large diameter, the pressure of the refrigerant is also correspondingly large. In order to reduce the valve opening driving force and improve the response speed, the large-diameter electronic expansion valve 100 of the present application adopts an internal balance structure. That is, a third sealing member 90 is further provided between the valve needle assembly 30 and the valve body 10, and the valve needle assembly 30 is movably sealed with the valve body 10 through the third sealing member 90. The valve cavity 101 between the end of the valve needle assembly 30 and the valve body 10 is a back pressure cavity 1011, and the valve needle assembly 30 is provided with a balancing channel 305. The back pressure cavity 1011 is always connected to the valve port 102 through the balancing channel 305, that is, the pressure at the back pressure cavity 1011 and the valve port 102 is always equal. This can solve the problem of difficulty in opening and closing the valve due to fluid pressure difference.

[0042] It should also be noted that a drive assembly 80 is typically installed within the valve sleeve 20. This drive assembly 80 cooperates with an external structure to achieve axial reciprocating movement of the valve needle assembly 30. Specifically, the drive assembly 80 includes a screw 81 connected to one end of the valve needle assembly 30. The screw 81 cooperates with a spring or the like to achieve reciprocating motion of the valve needle assembly 30.

[0043] Since the flow rate of the large-diameter valve port 102 is larger, if only the first sealing member 40 is provided in the valve needle assembly 30, the temperature difference between the cold and hot refrigerant causes the first sealing member 40 made of plastic material to deform, so that the interference between the first sealing member 40 and the valve needle assembly 30 is reduced, and the first sealing member 40 and the valve needle assembly 30 cannot be sealed. When the valve is closed, it is more likely to be loosely sealed, thereby causing leakage at the valve port 102. Therefore, in order to improve the sealing performance of the valve port 102, in one embodiment of the present application, as shown in FIG. Figure 1-Figure 3 As shown, the electronic expansion valve 100 further includes a first sealing member 40 and a second sealing member 50. The first sealing member 40 is connected to the valve needle assembly 30, and the second sealing member 50 is disposed between the first sealing member 40 and the valve needle assembly 30. In this way, the second sealing member 50 can always maintain a seal between the first sealing member 40 and the valve needle assembly 30, thereby preventing leakage from the valve port 102 when the valve is closed.

[0044] In one embodiment, the first sealing member 40 and the second sealing member 50 are provided separately, and the second sealing member 50 is in sealing contact with the first sealing member 40 and the valve needle assembly 30, respectively. The first sealing member 40 is in sealing contact with the valve port 102. In this way, the sealing of the valve port 102 is ensured when the valve is closed.

[0045] Specifically, the first seal 40 and the second seal 50 are both made of elastic material, and both are assembled with the valve needle assembly 30 through interference fit. The first seal 40 also presses against the valve port 102 through interference fit, thereby sealing the valve port 102. Thus, in this embodiment, through the cooperation of the first seal 40 and the second seal 50, when the first seal 40 has insufficient interference fit due to factors such as thermal expansion and contraction, resulting in a gap between the first seal 40 and the valve needle assembly 30, the second seal 50 can rely on its own elasticity to ensure a seal between the first elastic member 70 and the valve needle assembly 30, thereby preventing refrigerant from leaking through the gap between the first seal 40 and the valve needle assembly 30. This greatly improves the sealing of the valve port 102 and effectively ensures the performance of the electronic expansion valve 100.

[0046] More specifically, the first sealing member 40 in this embodiment is a sealing gasket, and the second sealing member 50 is an O-ring. The first sealing member 40 and the second sealing member 50 can be made of butyl rubber, fluororubber, polytetrafluoroethylene, polyurethane, etc., as long as they can achieve the same effect.

[0047] In another embodiment, Figure 4As shown, the valve needle assembly 30 includes a protrusion 33 that is at least partially embedded in the interior of the first sealing member 40, wherein the protrusion 33 is the second sealing member 50, and the first sealing member 40 is still in sealing engagement with the valve port 102. When the protrusion 33 is embedded in the first sealing member 40, the first sealing member 40 is elastically deformed under force. Under the action of the elastic restoring force, the first sealing member 40 can be tightly fitted with the protrusion 33. In this way, the protrusion 33 can block the gap channel between the first sealing member 40 and the valve needle assembly 30, thereby preventing refrigerant from leaking from the gap between the first sealing member 40 and the valve needle assembly 30.

[0048] Specifically, the protrusion 33 is annular and can be located anywhere on the contact surface between the valve needle assembly 30 and the first sealing member 40. Preferably, the protrusion 33 is embedded in the lower end surface of the first sealing member 40 to prevent the first sealing member 40 from expanding and deforming away from the axis of the electronic expansion valve 100. In this way, the protrusion 33 not only provides a seal but also serves to secure the first sealing member 40.

[0049] For example, the number of protrusions 33 is one to reduce the difficulty of setting. However, the number of protrusions 33 is not limited thereto, and can also be two, three, or more, which are not listed here one by one.

[0050] It should be noted that the lower end surface of the first sealing member 40 is the end surface of the first sealing member 40 close to the valve port 102 .

[0051] Furthermore, compared to a solution in which the first seal 40 is disposed on the valve body 10 and the valve port 102 is disposed on the first seal 40, the first seal 40 in this solution is more susceptible to wear. Furthermore, deformation of the first seal 40 affects the throttling flow rate, resulting in low throttling accuracy. However, when the electronic expansion valve 100 of this embodiment is in throttling mode, the first seal 40 does not affect the throttling flow rate, thereby achieving higher throttling accuracy.

[0052] In one embodiment, if Figure 1 and Figure 2 As shown, the valve body 10 also includes a second valve body 12, which is separate from the first valve body 11. The valve port 102 is located in the second valve body 12. The first valve body 11 also has a flow port 103 that communicates with the valve cavity 101. This facilitates the machining of the valve port 102 and improves the machining accuracy of the valve port 102. Specifically, in this embodiment, the first valve body 11 is sleeved around a portion of the circumference of the second valve body 12 and is connected to the second valve body 12.

[0053] In another embodiment, Figure 3 and Figure 4As shown, the valve body 10 also includes a second valve body 12, which is separate from the first valve body 11. The valve port 102 is located in the second valve body 12. The second valve body 12 also has a flow port 103 that communicates with the valve cavity 101. This facilitates the machining of the valve port 102 and improves the machining accuracy of the valve port 102. Specifically, in this embodiment, the second valve body 12 is sleeved around a portion of the circumference of the first valve body 11 and is connected to the first valve body 11.

[0054] In one embodiment, if Figures 1-4 As shown, the valve needle assembly 30 includes a first valve needle segment 31 and a second valve needle segment 32. At least a portion of the second valve needle segment 32 is mounted on one end of the first valve needle segment 31 and forms a first mounting groove 302 with the first valve needle segment 31. The first sealing member 40 is mounted in the first mounting groove 302. By configuring the valve needle assembly 30 as a separate first valve needle segment 31 and second valve needle segment 32, installation of the first sealing member 40 is facilitated, thereby reducing the difficulty of assembling the first sealing member 40.

[0055] Example 1

[0056] In this embodiment, if Figure 1 As shown, the first valve needle segment 31 includes a valve needle body 311 and a connecting post 312, wherein the connecting post 312 is connected to one end of the valve needle body 311. The second valve needle segment 32 includes a throttle ring 321, which is sleeved around the connecting post 312 and abuts against the valve needle body 311. The throttle segment 301 is disposed on the throttle ring 321, and a first mounting groove 302 is formed between the valve needle body 311 and the throttle ring 321.

[0057] That is, in this embodiment, the throttle ring 321 and the valve needle body 311 are separate structures. This allows, on the one hand, the throttle ring 321 and the valve needle body 311 to be made of different materials, thereby reducing overall costs. On the other hand, it can also correspondingly improve the processing accuracy of the throttle section 301 on the throttle ring 321, thereby improving the throttling accuracy of the throttle section 301.

[0058] Specifically, the valve needle body 311 and connecting post 312 are integrally formed, reducing assembly steps and improving processing efficiency. The throttle ring 321 and connecting post 312 can be secured together via laser welding or riveting. This ensures a reliable connection between the throttle ring 321 and connecting post 312 while avoiding the thermal effects of conventional welding processes, further improving the throttling accuracy of the throttle ring 321.

[0059] In one embodiment, the outer diameter of the throttle ring 321 is larger than the outer diameter of the end surface of the valve needle body 311 near the connecting post 312, so that a first mounting groove 302 can be formed between the throttle ring 321 and the valve needle body 311. That is, along the axial direction of the valve needle assembly 30, the first mounting groove 302 has an opening at one end near the throttle ring 321. During assembly, the first sealing member 40 can be first inserted into the first mounting groove 302 through this opening, and then the throttle ring 321 can be sleeved onto the connecting post 312 to achieve connection. This simplifies the entire assembly operation and improves the efficiency of assembling the first sealing member 40 and the throttle ring 321.

[0060] Furthermore, in one embodiment, the valve needle body 311 or the second valve needle segment 32 defines a second mounting groove 303, which communicates with the first mounting groove 302. The electronic expansion valve 100 also includes a second sealing member 50, which is installed within the second mounting groove 303 and positioned between the first sealing member 40 and the valve needle body 311. This allows the second sealing member 50 to be installed, further enhancing the sealing effect on the valve port 102 and ensuring the performance of the electronic expansion valve 100.

[0061] Example 2

[0062] In this embodiment, if Figure 2-Figure 4 As shown, the first valve needle segment 31 defines an assembly cavity 3101, and at least a portion of the second valve needle segment 32 is located within the assembly cavity 3101. One end of the second valve needle segment 32 is spaced apart from one end of the first valve needle segment 31, and one end of the second valve needle segment 32 and one end of the first valve needle segment 31 are sandwiched to form a first mounting groove 302. The throttling segment 301 is located at one end of the second valve needle segment 32.

[0063] It is understandable that during assembly, the second valve needle segment 32 can first pass through the first seal 40 and then be inserted into the assembly cavity 3101, which also reduces the assembly difficulty and improves the assembly efficiency of the second valve needle segment 32 and the first seal 40.

[0064] Specifically, the first mounting groove 302 is provided at one end of the valve needle assembly 30 close to the valve port 102. Figure 2 As shown, the assembly cavity 3101 may be provided only at one end of the first valve needle segment 31 close to the valve port 102 .

[0065] Furthermore, in one embodiment, a welding groove 3102 is formed on the outer wall of the first needle segment 31, and the first needle segment 31 is laser-through-welded to the second needle segment 32 via the welding groove 3102. This arrangement can reduce the wall thickness of the first needle segment 31 at the weld point between the first and second needle segments 31, 32, thereby facilitating laser-through-welding.

[0066] To further ensure the stability of the connection between the first valve needle segment 31 and the second valve needle segment 32, in one embodiment, the inner wall of the assembly cavity 3101 includes a first connecting segment 3101a. The first connecting segment 3101a is located on the side of the welding groove 3102 away from the valve port 102, and the first connecting segment 3101a is interference-fitted with the second valve needle segment 32. The interference fit ensures the stability of the connection between the second valve needle segment 32 and the first connecting segment 3101a in the assembly cavity 3101, thereby facilitating penetration welding at the welding groove 3102 after the second valve needle segment 32 and the first connecting segment 3101a are interference-fitted.

[0067] Furthermore, in one embodiment, the inner wall of the assembly cavity 3101 further includes a second connecting segment 3101b. The second connecting segment 3101b is located on the side of the weld groove 3102 near the valve port 102, and the second connecting segment 3101b forms a clearance fit with the second valve needle segment 32. It will be appreciated that the second connecting segment 3101b and the first connecting segment 3101a are located on opposite sides of the weld groove 3102 along the axial direction of the electronic expansion valve 100. This clearance fit reduces the difficulty of installing the second valve needle segment 32 when it is inserted into the assembly cavity 3101.

[0068] Specifically, the welding groove 3102 is arranged in a cone shape, and the inner wall of the assembly cavity 3101 is divided into the above-mentioned first connecting section 3101a and the second connecting section 3101b with the bottom of the welding groove 3102 as the boundary, which is convenient for positioning processing.

[0069] In one embodiment, if Figure 3 As shown, the first valve needle segment 31 and the second valve needle segment 32 form a second mounting groove 303, which is connected to the first mounting groove 302. The second sealing member 50 is installed in the second mounting groove 303. In this way, the second mounting groove 303 is simply formed, and the second sealing member 50 can be easily installed.

[0070] Specifically, a chamfer is provided at the end of the first valve needle segment 31 close to the second valve needle segment 32 . When the chamfer is abutted against the first sealing member 40 , it can form a second mounting groove 303 with the outer wall of the second valve needle segment 32 .

[0071] In another embodiment, Figure 2 As shown, the second valve needle segment 32 defines a second mounting groove 303, which communicates with the first mounting groove 302. The second sealing member 50 is mounted in the second mounting groove 303. This allows the second sealing member 50 to be installed and seal the first sealing member 40 and the valve needle assembly 30.

[0072] In another embodiment, the first valve needle segment 31 defines a second mounting groove 303, which communicates with the first mounting groove 302. The second sealing member 50 is mounted in the second mounting groove 303. This allows the second sealing member 50 to be installed and seal the first sealing member 40 and the valve needle assembly 30.

[0073] In summary, the second installation groove 303 can be formed by surrounding or directly processing, as long as it can achieve the same effect.

[0074] Example 3

[0075] The structure of this embodiment is basically the same as that of the second embodiment, and the similarities are not repeated here. The difference is that: in this embodiment, Figure 3 and Figure 4 As shown, the assembly cavity 3101 is provided through both ends of the first valve needle segment 31 , and the second valve needle segment 32 is provided through and protrudes from one end of the assembly cavity 3101 away from the valve port 102 .

[0076] Furthermore, in one embodiment, Figure 3 As shown, a third mounting groove 304 is formed between the other end of the second valve needle segment 32 and the other end of the first valve needle segment 31. The electronic expansion valve 100 also includes an elastic member 70. Along the axial direction of the valve needle assembly 30, one end of the elastic member 70 abuts within the third mounting groove 304, while the other end abuts against the valve body 10. By forming the third mounting groove 304 between the other end of the second valve needle segment 32 and the other end of the first valve needle segment 31, the depth of the third mounting groove 304 along the axial direction of the electronic expansion valve 100 is increased, thereby increasing the space for the elastic member 70 and preventing compression of the elastic member 70 due to insufficient space (compression refers to the inability of the elastic member 70 to return to its original state after compression).

[0077] Among them, the setting of the elastic member 70 can apply a force toward the valve port 102 to the valve needle assembly 30, thereby ensuring the stability of the valve needle assembly 30 during axial movement or after opening and closing the valve port 102, reducing the probability of the valve needle assembly 30 shaking after being impacted by the fluid, thereby greatly improving the operating reliability of the electronic expansion valve 100.

[0078] Specifically, the third mounting groove 304 is provided at the end of the valve needle assembly 30 away from the valve port 102. The end of the second valve needle segment 32 away from the first sealing member 40 is connected to the screw 81. That is, the second valve needle segment 32 passes through the first valve needle segment 31 and is connected to the screw 81. This facilitates the connection of the split second valve needle segment 32 with the first valve needle segment 31 and also facilitates the formation of the third mounting groove 304 between the second valve needle segment 32 and the first valve needle segment 31.

[0079] Furthermore, in one embodiment, the second needle segment 32 includes a second needle body 322 and a spring sleeve 323. The screw 81, the spring sleeve 323, and the second needle body 322 are sequentially connected. To enhance the stability of the elastic member 70, the inner ring of the other end of the elastic member 70 is in contact with the outer wall of the second needle segment 32. Specifically, the inner ring of the end of the elastic member 70 away from the valve sleeve 20 is in contact with the outer wall of the second needle body 322.

[0080] In one embodiment, the top of the valve body 10 (i.e., the end of the valve body 10 away from the valve port 102) is defined as the valve seat ring 13, and there is a certain gap between the valve seat ring 13 and the top of the second valve needle section 32. Specifically, there will be a certain gap between the two when the spring sleeve 323 is inserted into the valve seat ring 13.

[0081] Based on this, in order to prevent the top of the elastic member 70 from being stuck in the gap and affecting the normal movement of the valve needle assembly 30, as shown in FIG. Figure 4 As shown, the openings at both ends of the elastic member 70 can be set to be equal in size, and the outer ring of the elastic member 70 can be aligned and guided with the inner wall of the first valve needle segment 31. In this way, the elastic member 70 can avoid the above-mentioned gap, and the inner wall of the first valve needle segment 31 can ensure the stability of the elastic member 70.

[0082] In another embodiment, Figure 3 As shown, the opening size of one end of the elastic member 70 can also be smaller than the opening size of the other end, and the inner ring of the other end of the first elastic member 70 can be in contact with the outer wall of the second valve needle segment 32. The end of the elastic member 70 closest to the valve sleeve 20 is larger. This way, the elastic member 70 can also avoid the above-mentioned gap, while the outer wall of the second valve needle segment 32 can ensure the stability of the elastic member 70.

[0083] It should be noted that in the first and second embodiments, an elastic member 70 may also be provided and positioned directly against the end surface of the first valve needle segment 31 to improve stability to a certain extent. Alternatively, a third mounting groove 304 may be directly machined into the first valve needle segment 31 to facilitate the installation and fixation of the elastic member 70.

[0084] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0085] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of patent protection for the present application shall be determined by the appended claims.

Claims

1. An electronic expansion valve, characterized in that: The valve body (10) comprises a mounting seat (60), a valve body (10) and a valve needle assembly (30); the mounting seat (60) is provided with a mounting cavity (61); at least a portion of the valve body (10) is arranged in the mounting cavity (61); the valve body (10) is provided with a valve cavity (101) and a valve port (102) connected to the valve cavity (101); the valve needle assembly (30) is movably arranged in the valve cavity (101) to open or close the valve port (102); The valve body (10) comprises a first valve body (11) connected to the mounting seat (60), the first valve body (11) comprises a guide section (111), at least a portion of the inner wall of the guide section (111) and the outer wall of the first valve body (11) opposite thereto are an integral structure, and the outer wall of the valve needle assembly (30) is in direct contact with and guide-matched with the inner wall of the guide section (111); Wherein, a throttling section (301) is provided at one end of the valve needle assembly (30) close to the valve port (102), and the electronic expansion valve has a throttling mode. When the electronic expansion valve is in the throttling mode, at least a portion of the throttling section (301) extends into the valve port (102) and cooperates with the valve port (102) to adjust the flow of the valve port (102).

2. The electronic expansion valve according to claim 1, characterized in that: The electronic expansion valve further comprises a first sealing member (40) and a second sealing member (50), wherein the first sealing member (40) is connected to the valve needle assembly (30), and the second sealing member (50) is arranged between the first sealing member (40) and the valve needle assembly (30).

3. The electronic expansion valve according to claim 2, characterized in that: The first seal (40) and the second seal (50) are separately arranged, and the second seal (50) is sealingly abutted against the first seal (40) and the valve needle assembly (30) respectively, wherein the first seal (40) is sealingly matched with the valve port (102).

4. The electronic expansion valve according to claim 2, characterized in that: The valve needle assembly (30) includes a protrusion (33) at least partially embedded in the first sealing member (40), wherein the protrusion (33) is the second sealing member (50), and the first sealing member (40) is sealingly matched with the valve port (102).

5. The electronic expansion valve according to claim 1, characterized in that: The electronic expansion valve further comprises a first sealing member (40), wherein the first sealing member (40) is in sealing cooperation with the valve port (102); The valve needle assembly (30) comprises a first valve needle segment (31) and a second valve needle segment (32), wherein at least a portion of the second valve needle segment (32) is mounted on one end of the first valve needle segment (31) and forms a first mounting groove (302) with the first valve needle segment (31), and the first sealing member (40) is mounted in the first mounting groove (302).

6. The electronic expansion valve according to claim 5, characterized in that: The first valve needle section (31) comprises a valve needle body (311) and a connecting column (312), wherein the connecting column (312) is connected to one end of the valve needle body (311); The second valve needle section (32) includes a throttling ring (321), which is sleeved on the circumferential side of the connecting column (312) and abuts against the valve needle body (311), wherein the throttling section (301) is arranged on the throttling ring (321), and the first mounting groove (302) is formed between the valve needle body (311) and the throttling ring (321).

7. The electronic expansion valve according to claim 6, characterized in that: The valve needle body (311) or the second valve needle section (32) is provided with a second installation groove (303), and the second installation groove (303) is communicated with the first installation groove (302); The electronic expansion valve further comprises a second sealing member (50), wherein the second sealing member (50) is installed in the second installation groove (303) and is located between the first sealing member (40) and the valve needle body (311).

8. The electronic expansion valve according to claim 5, characterized in that: The first valve needle segment (31) is provided with an assembly cavity (3101), at least a portion of the second valve needle segment (32) is located in the assembly cavity (3101), one end of the second valve needle segment (32) is spaced apart from one end of the first valve needle segment (31), and one end of the second valve needle segment (32) and one end of the first valve needle segment (31) are clamped to form the first installation groove (302); Wherein, the throttling section (301) is arranged at one end of the second valve needle section (32).

9. The electronic expansion valve according to claim 8, characterized in that: The electronic expansion valve further comprises a second sealing member (50), the first valve needle segment (31) and the second valve needle segment (32) enclose a second mounting groove (303), the second mounting groove (303) is communicated with the first mounting groove (302), and the second sealing member (50) is installed in the second mounting groove (303); Alternatively, the first valve needle section (31) is provided with a second installation groove (303), the second installation groove (303) is communicated with the first installation groove (302), and the second sealing member (50) is installed in the second installation groove (303); Alternatively, the second valve needle section (32) is provided with a second installation groove (303), the second installation groove (303) is communicated with the first installation groove (302), and the second sealing member (50) is installed in the second installation groove (303).

10. The electronic expansion valve according to claim 8, characterized in that: A third mounting groove (304) is formed between the other end of the second valve needle segment (32) and the other end of the first valve needle segment (31); The electronic expansion valve further comprises an elastic member (70), wherein along the axial direction of the valve needle assembly (30), one end of the elastic member (70) abuts against the third mounting groove (304), and the other end abuts against the valve body (10).

11. The electronic expansion valve according to claim 10, characterized in that: The openings at both ends of the elastic member (70) are of equal size, and the outer ring of the elastic member (70) is in contact with and guides the inner wall of the first valve needle section (31).

12. The electronic expansion valve according to claim 10, characterized in that: The opening size of one end of the elastic member (70) is smaller than the opening size of the other end, and the inner ring of the other end of the elastic member (70) is in contact with the outer wall of the second valve needle section (32).

13. The electronic expansion valve according to claim 12, characterized in that: The electronic expansion valve further comprises a screw rod (81), the second valve needle section (32) comprises a second valve needle body (322) and a spring sleeve (323), and the screw rod (81), the spring sleeve (323) and the second valve needle body (322) are connected in sequence; The inner ring of the other end of the elastic member (70) is in contact with the outer wall of the second valve needle body (322).

14. The electronic expansion valve according to claim 8, characterized in that: The outer side wall of the first valve needle segment (31) is provided with a welding groove (3102), and the first valve needle segment (31) is welded to the second valve needle segment (32) through the welding groove (3102).

15. The electronic expansion valve according to claim 14, characterized in that: The inner wall of the assembly cavity (3101) includes a first connecting section (3101a), the first connecting section (3101a) is located on the side of the welding groove (3102) away from the valve port (102), and the first connecting section (3101a) is interference fit with the second valve needle section (32).

16. The electronic expansion valve according to claim 15, characterized in that: The inner wall of the assembly cavity (3101) further comprises a second connecting section (3101b), the second connecting section (3101b) being located on a side of the welding groove (3102) close to the valve port (102), and the second connecting section (3101b) and the second valve needle section (32) being in clearance fit; Wherein, the second connecting section (3101b) and the first connecting section (3101a) are respectively located on two sides of the welding groove (3102) along the axial direction of the electronic expansion valve.

17. The electronic expansion valve according to claim 8, characterized in that: The electronic expansion valve further comprises a screw rod (81), wherein the screw rod (81) is connected to an end of the second valve needle section (32) away from the first sealing member (40).

18. The electronic expansion valve according to claim 1, characterized in that: The valve body (10) further comprises a second valve body (12) which is arranged separately from the first valve body (11), and the valve port (102) is located in the second valve body (12); Wherein, the first valve body (11) is also provided with a flow port (103) communicating with the valve cavity (101).

19. The electronic expansion valve according to claim 1, characterized in that: The valve body (10) further comprises a second valve body (12) which is arranged separately from the first valve body (11), and the valve port (102) is located in the second valve body (12); Wherein, the second valve body (12) is further provided with a flow port (103) communicating with the valve cavity (101).

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