Electronic expansion valve

Abstract

The electronic expansion valve comprises a valve element assembly and a valve seat assembly, the valve seat assembly is provided with a valve port part, and the valve element assembly can open or close the valve port part. The electronic expansion valve further comprises a guide seat, the guide seat is arranged at the end, away from the valve port part, of the valve seat assembly, and the valve element assembly is movably matched with the guide seat in the preset axial direction. According to the electronic expansion valve, the problem that an existing stop seat is high in machining difficulty and assembling difficulty is solved.

Description

[0001] This application claims priority to a patent application filed with the State Intellectual Property Office of China on November 20, 2023, with application number 2023232461608 and title “An Electronic Expansion Valve”. Technical Field

[0002] The present application relates to the field of valve body technology, and in particular to an electronic expansion valve. Background Art

[0003] The electronic expansion valve is used as a throttling element to adjust the on / off and flow rate of the fluid. The electronic expansion valve includes a rotor assembly, a screw rod, a valve core assembly, and a stop seat. The rotor assembly drives the screw rod to rotate helically, and a portion of the screw rod is provided with an external thread. The screw rod is threadedly connected to the valve core assembly, and the valve core assembly is limitedly connected to the stop seat. When the rotor assembly drives the screw rod to rotate, the valve core assembly only moves up and down along the valve axis.

[0004] With this solution, it is necessary to machine structures such as a slide groove that cooperates with the valve core assembly to limit the position on the stop seat, which increases the difficulty of machining the stop seat.

[0005] Therefore, how to increase or decrease the processing difficulty of the stop seat is a technical problem that needs to be solved in this application. Utility Model Content

[0006] Based on this, it is necessary to provide an electronic expansion valve to solve the problems of difficulty in processing and assembling the current stop seat.

[0007] The electronic expansion valve provided in the present application includes a valve core assembly and a valve seat assembly, wherein the valve seat assembly is provided with a valve opening portion, and the valve core assembly can open or close the valve opening portion. The electronic expansion valve also includes a guide seat, which is arranged at one end of the valve seat assembly away from the valve opening portion, and the valve core assembly and the guide seat are movably matched along a preset axial direction.

[0008] In one embodiment, the guide seat is connected to the valve seat assembly by interference fit.

[0009] In one embodiment, the electronic expansion valve further comprises a stop seat, and the top of the guide seat extends into the stop seat.

[0010] In one embodiment, the valve core assembly includes a sliding nut, which includes a nut body and a stop protrusion. The stop protrusion is fixed on the outer peripheral side of the nut body. The guide seat is provided with a main body hole and a limiting hole connected to the main body hole. The nut body and the main body hole are movably matched along a preset axial direction, and the stop protrusion and the limiting hole are movably matched along the preset axial direction and are limitedly matched along the circumferential direction around the preset axial direction.

[0011] In one embodiment, the guide seat is cylindrical, the main body hole and the guide seat are coaxially arranged, and the limiting hole is arranged on the side wall of the guide seat along a preset axial direction.

[0012] In one of the embodiments, a first connecting member is disposed on the outer peripheral fixing sleeve of the guide seat.

[0013] In one of the embodiments, the first connecting member is provided with a through hole penetrating through the first connecting member along a preset axial direction, and the through hole is connected to an end of the limiting hole away from the main body hole.

[0014] In one embodiment, the guide seat is provided with a convex rib, and the valve seat assembly is provided with a snap-in protrusion corresponding to the convex rib. The snap-in protrusion can be snapped into a groove formed by deformation of the convex rib along a preset axial direction to prevent the guide seat from rotating relative to the valve seat assembly.

[0015] In one of the embodiments, a first limiting protrusion and a second limiting protrusion that are arranged opposite to each other are provided at one end of the valve seat assembly close to the guide seat, and the guide seat is sandwiched between the first limiting protrusion and the second limiting protrusion.

[0016] In one embodiment, the guide seat is a metal part.

[0017] In one embodiment, the valve seat assembly includes a first seat body and a second seat body, the first seat body has a first mounting groove, and the end of the second seat body is located in the first mounting groove; a second connecting piece is provided on the outer periphery of the guide seat, and the second connecting piece is clamped between the bottom wall of the first mounting groove and the end of the second seat body. There is a gap between the circumferential outer wall of the second connecting piece and the circumferential inner wall of the first mounting groove.

[0018] In one of the embodiments, a first connecting member is further provided on the outer periphery of the guide seat, and the second connecting member is located on the outer periphery of the first connecting member; the first seat body has a second mounting groove, the bottom wall of the first mounting groove is recessed in a direction away from the valve port to form the second mounting groove, and the circumferential outer wall of the first connecting member is fixedly connected to the circumferential inner wall of the second mounting groove.

[0019] In one of the embodiments, the circumferential outer wall of the first connecting member is threadedly connected to the circumferential inner wall of the second mounting groove.

[0020] In one embodiment, a gap is formed between an end of the first connecting member away from the second connecting member and a bottom wall of the second mounting groove.

[0021] In one embodiment, the valve core assembly includes a second valve needle, the second valve needle is provided with a sealing member, the hardness of the sealing member is less than the hardness of the valve opening, and the sealing member is in sealing cooperation with the valve opening.

[0022] Compared with the prior art, in the electronic expansion valve provided by the present application, since the guide seat is an independent component, the guide seat can be independently processed, which greatly reduces the processing difficulty of the guide seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 A schematic diagram of the structure of an electronic expansion valve according to an embodiment of the present application;

[0025] Figure 2 A cross-sectional view of an electronic expansion valve according to an embodiment of the present application;

[0026] Figure 3 A schematic diagram of the structure of a rotor assembly and a guide rod according to an embodiment of the present application;

[0027] Figure 4 A partial exploded view of an electronic expansion valve according to an embodiment of the present application;

[0028] Figure 5 A schematic diagram of the structure of a guide seat according to an embodiment of the present application;

[0029] Figure 6 A schematic diagram of the installation position of a guide seat according to an embodiment of the present application;

[0030] Figure 7 A schematic diagram of the structure of a first seat body according to an embodiment of the present application;

[0031] Figure 8 This is a schematic diagram of other structures of a guide seat according to an embodiment of the present application.

[0032] Reference numerals: 100, housing; 200, rotor assembly; 300, screw rod; 400, valve core assembly; 410, sliding nut; 411, nut body; 412, anti-rotation protrusion; 420, first valve needle; 430, second valve needle; 431, adjustment channel; 500, valve seat assembly; 510, valve port; 520, clamping protrusion; 530, first limiting protrusion; 540, second limiting protrusion; 600, stop ring; 700, guide Directional rod; 800, stop seat; 810, outer guide rail portion; 820, guide seat; 821, main body hole; 822, limit hole; 823, first connecting member; 824, through hole; 825, convex rib; 910, first elastic member; 920, second elastic member; 1-1, first mounting groove; 1-2, second connecting member; 1-3, second mounting groove; 1-4, sealing member; 1-5, first seat body; 1-6, second seat body; 1-7, mounting body. DETAILED DESCRIPTION

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0034] 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.

[0035] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] 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 and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “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”, and “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.

[0037] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein 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 herein includes any and all combinations of one or more of the related listed items.

[0039] See also Figure 1-Figure 5 The present application provides an electronic expansion valve, which includes a housing 100, a stator assembly, a rotor assembly 200, a screw rod 300, a valve core assembly 400 and a valve seat assembly 500. The housing 100 is covered on the outside of the rotor assembly 200, part of the screw rod 300 and part of the valve core assembly 400 and welded to the valve seat assembly 500. The stator assembly is sleeved on the outside of the housing 100, and the stator assembly can drive the rotor assembly 200 to rotate. The valve seat assembly 500 is provided with a valve mouth 510, and the valve core assembly 400 can move relative to the valve seat assembly 500 along the axial direction of the screw rod 300, one end of the screw rod 300 is fixedly connected to the rotor assembly 200, and the other end is threadedly connected to the valve core assembly 400, and the rotor assembly 200 can drive the valve core assembly 400 to move in a direction close to or away from the valve mouth 510 through the screw rod 300.

[0040] The electronic expansion valve further includes a stop ring 600, a guide rod 700 and a stop seat 800, wherein the stop seat 800 is sleeved outside the screw rod 300 and fixedly connected to the valve seat assembly 500. The stop seat 800 is also provided with an outer guide rail portion 810 (an outer threaded guide rail in this embodiment) on the outer peripheral side away from the screw rod 300, the stop ring 600 is sleeved on the outer periphery of the stop seat 800 and movably cooperates with the outer guide rail portion 810, the guide rod 700 is fixedly connected to the rotor assembly 200 or the screw rod 300, and the rotor assembly 200 can drive the guide rod 700 to push the stop ring 600 to spirally move along the outer guide rail portion 810.

[0041] The valve core assembly 400 includes a sliding nut 410, a first valve needle 420 and a second valve needle 430. The end of the screw rod 300 away from the rotor assembly 200 is threadedly matched with the sliding nut 410. The screw rod 300 can drive the sliding nut 410 to drive the second valve needle 430 to open or close the valve port 510 through the first valve needle 420. The second valve needle 430 is provided with an adjustment channel 431 that can be connected to the valve port 510. The flow area of ​​the adjustment channel 431 is smaller than the flow area of ​​the valve port 510. The screw rod 300 can drive the sliding nut 410 to drive the first valve needle 420 to flexibly cooperate with the adjustment channel 431 to control the amount of liquid entering the adjustment channel 431.

[0042] In this way, the screw rod 300 can be rotated along the preset direction first to drive the sliding nut 410 to drive the first valve needle 420 and the second valve needle 430 to close the valve mouth 510. Then, the screw rod 300 can be rotated in the direction opposite to the preset direction to drive the sliding nut 410 to drive the first valve needle 420 to move away from the regulating channel 431, thereby achieving fine-tuning of the liquid inlet amount at the regulating channel 431.

[0043] In one embodiment, the electronic expansion valve further comprises a first elastic member 910, one end of the first elastic member 910 is connected to the screw rod 300, and the other end is connected to the stop seat 800 or the valve seat assembly 500, wherein the connection here comprises abutment. The first elastic member 910 is a compression elastic member, so that the screw rod 300 and the stop seat 800 (or the valve seat assembly 500) can be movably matched along the axial direction of the screw rod 300 through the first elastic member 910.

[0044] When the valve core assembly 400 moves to the position of closing the valve mouth portion 510 and the rotor assembly 200 continues to rotate, the first valve needle 420 and the second valve needle 430 can no longer move toward the valve mouth portion 510. Since the screw rod 300 and the valve seat assembly 500 can cooperate along the axial direction of the screw rod 300 through the first elastic member 910, the screw rod 300 and the rotor assembly 200 move in a direction away from the valve mouth portion 510, and the first elastic member 910 is squeezed during the movement of the screw rod 300. Under the push of the reaction force, the first elastic member 910 generates an elastic force on the screw rod 300. The elastic force can drive the screw rod 300 to drive the valve core assembly 400 to further squeeze the valve mouth portion 510, so as to generate a pre-tightening force on the valve mouth portion 510, thereby improving the sealing between the valve mouth portion 510 and the second valve needle 430.

[0045] Specifically, in one embodiment, the first elastic member 910 is a compression spring or a metal spring.

[0046] In one embodiment, the electronic expansion valve also includes a second elastic member 920, one end of the second elastic member 920 abuts against the second valve needle 430, and the other end abuts against the valve seat assembly 500, and the second elastic member 920 is a compression elastic member so that the second valve needle 430 has a tendency to move toward the direction close to the valve mouth portion 510.

[0047] In this way, the second valve needle 430 is always driven by the second elastic member 920 , which can prevent the second valve needle 430 from shaking left and right, thereby facilitating the alignment of the first valve needle 420 and the regulating channel 431 .

[0048] Specifically, in one embodiment, the second elastic member 920 is a compression spring, and the second elastic member 920 is sleeved on the outside of a portion of the second valve needle 430 and a portion of the sliding nut 410 .

[0049] In this way, it is helpful to control the driving force of the second elastic member 920 on the second valve needle 430 .

[0050] In one embodiment, if Figure 2 , Figure 4 and Figure 5 As shown, the electronic expansion valve further includes a guide seat 820, which is arranged at one end of the stop seat 800 close to the valve mouth 510 and connected to the valve seat assembly 500, and the sliding nut 410 and the guide seat 820 are movably matched along the preset axial direction. The valve core assembly 400 and the guide seat 820 are limitedly matched along the circumferential direction around the preset axial direction. Therefore, there is no need to process a slide groove on the stop seat 800 to limit the valve core assembly 400, and only one guide seat 820 needs to be processed separately, which reduces the difficulty of limiting the rotation design of the valve core assembly 400.

[0051] Specifically, the guide seat 820 is connected to the valve seat assembly 500 by interference fit, and the top of the guide seat 820 extends into the stop seat 800 .

[0052] It should be noted that the preset axial direction, the axial direction of the screw rod 300, the axial direction of the stop seat 800, the axial direction of the valve core assembly 400, the axial direction of the rotor assembly 200 and the axial direction of the electronic expansion valve are all in the same direction, that is, in the electronic expansion valve, the components such as the screw rod 300, the stop seat 800 and the valve core assembly 400 are all coaxially arranged.

[0053] Since the guide seat 820 and the stop seat 800 are respectively connected to the valve seat assembly 500 and the guide seat 820 and the stop seat 800 are independent components, the guide seat 820 can be processed independently, which greatly reduces the processing difficulty of the guide seat 820 and the stop seat 800.

[0054] Specifically, in one embodiment, the guide seat 820 is a metal part. Specifically, the guide seat 820 is made of aluminum alloy, stainless steel, copper alloy, etc., which are not listed here one by one.

[0055] In this way, the wear resistance of the guide seat 820 axially matched with the sliding nut 410 is increased, and the processing cost of the guide seat 820 is reduced.

[0056] Further, in one embodiment, if Figure 2 and Figure 4 As shown, the sliding nut 410 includes a nut body 411 and a stop protrusion 412, the stop protrusion 412 is fixed on the outer peripheral side of the nut body 411, the guide seat 820 is provided with a main body hole 821 and a limiting hole 822 connected to the main body hole 821, the nut body 411 and the main body hole 821 are movably matched along a preset axial direction, the stop protrusion 412 and the limiting hole 822 are movably matched along the preset axial direction and are limitedly matched along the circumferential direction around the preset axial direction.

[0057] That is to say, the anti-rotation protrusion 412 does not affect the movable cooperation between the sliding nut 410 and the guide seat 820 along the preset axial direction. However, under the limiting action of the limiting hole 822, the anti-rotation protrusion 412 cannot rotate around the preset axial direction, that is, the sliding nut 410 cannot rotate relative to the guide seat 820.

[0058] In one embodiment, the main body hole 821 and the limiting hole 822 both penetrate the guide seat 820 along a preset axial direction.

[0059] Specifically, the number of the anti-rotation protrusions 412 can be one or more. For example, when the number of the anti-rotation protrusions 412 is two, the two anti-rotation protrusions 412 are arranged at two opposite ends of the nut body 411. For the convenience of processing, the multiple anti-rotation protrusions 412 are evenly spaced along the direction around the preset axial direction.

[0060] In one embodiment, if Figure 2 , Figure 4 and Figure 5 As shown, the guide seat 820 is cylindrical, the main body hole 821 and the guide seat 820 are coaxially arranged, and the limiting hole 822 passes through the side wall of the guide seat 820 along the preset axial direction. Of course, the limiting hole 822 may not pass through the side wall of the guide seat 820.

[0061] It should be noted that when a limiting hole 822 also penetrates the side wall of the guide seat 820 along the radial direction, the guide seat 820 is in a C shape with a notch on one side.

[0062] When the length of the anti-rotation protrusion 412 along the radial direction of the guide seat 820 is greater than or equal to the thickness of the side wall of the guide seat 820, the limiting hole 822 penetrates the side wall of the guide seat 820 along the radial direction of the guide seat 820. In this way, the guide seat 820 is separated by the limiting hole 822. In order to improve the structural strength of the guide seat 820, in this embodiment, Figure 2 , Figure 4 and Figure 5 As shown, a first connecting member 823 is fixedly sleeved on the outer circumference of the guide seat 820. Specifically, the first connecting member 823 is sleeved on the middle part of the guide seat 820, and the first connecting member 823 and the guide seat 820 are an integrally formed part.

[0063] Further, when the length of the anti-rotation protrusion 412 continues to extend, in one embodiment, as Figure 2 , Figure 4 and Figure 5 As shown, the first connecting member 823 is provided with a through hole 824 penetrating the first connecting member 823 along a preset axial direction, and the through hole 824 is connected to an end of the limiting hole 822 away from the main body hole 821 .

[0064] In one embodiment, if Figure 4 and Figure 5 As shown, a circle of ribs 825 is provided at one end of the guide seat 820 close to the valve mouth 510, and the valve seat assembly 500 is provided with a snap-in protrusion 520 corresponding to the ribs 825. The snap-in protrusion 520 can be snapped into the ribs 825 along a preset axial direction to prevent the guide seat 820 from rotating relative to the valve seat assembly 500.

[0065] In this way, during assembly, the guide seat 820 can be pressed along a preset axial direction so that the engaging protrusion 520 is engaged with the rib 825 , thereby preventing the guide seat 820 from rotating relative to the valve seat assembly 500 .

[0066] Specifically, the number of the clamping protrusions 520 may be one or more. When the number of the clamping protrusions 520 is more than one, the multiple clamping protrusions 520 are arranged on the valve seat assembly 500 along a direction around a preset axial direction.

[0067] However, it is not limited thereto. In another embodiment, the convex rib 825 may also be provided on the valve seat assembly 500 , and the guide seat 820 may be provided with a clamping protrusion 520 corresponding to the convex rib 825 .

[0068] In one embodiment, if Figure 4 As shown, one end of the valve seat assembly 500 close to the guide seat 820 is provided with a first limiting protrusion 530 and a second limiting protrusion 540 which are arranged opposite to each other, and the guide seat 820 is sandwiched between the first limiting protrusion 530 and the second limiting protrusion 540 .

[0069] In this way, the guide seat 820 can be limited to prevent the guide seat 820 from tilting when the rib 825 is deformed.

[0070] Like paste Figure 6-8 As shown, in one embodiment, the guide seat 820 has a second connecting member 1-2 in addition to the first connecting member 823. Specifically, the first seat body 1-5 has a first mounting groove 1-1, and the end of the second seat body 1-6 is located in the first mounting groove 1-1. The outermost periphery of the guide seat 820 is provided with a second connecting member 1-2, and the second connecting member 1-2 is clamped between the bottom wall of the first mounting groove 1-1 and the end of the second seat body 1-6. The bottom wall of the first mounting groove 1-1 has a through hole, and the first mounting groove 1-1 makes the inner wall of the first seat body 1-5 L-shaped. The two end surfaces of the second connecting member 1-2 along the valve axial direction are respectively fitted with the first seat body 1-5 and the second seat body 1-6, and the second connecting member 1-2 is firmly clamped by the first seat body 1-5 and the second seat body 1-6 to prevent the guide seat 820 from rotating.

[0071] There is a gap between the circumferential outer wall of the second connecting member 1-2 and the circumferential inner wall of the first mounting groove 1-1, which can prevent the second connecting member 1-2 from being too large in the radial direction of the valve and making it difficult to install in the first seat body 1-5. The circumferential outer wall of the second connecting member 1-2 specifically refers to the annular side wall located between the two end surfaces of the second connecting member 1-2. The circumferential inner wall of the first mounting groove 1-1 specifically refers to the annular inner wall along the axial direction of the valve.

[0072] The second connecting member 1-2 is located on the periphery of the first connecting member 823. The first seat body 1-5 has a second mounting groove 1-3, and the bottom wall of the second mounting groove 1-3 has a through hole, and the second mounting groove 1-3 makes the inner wall of the first seat body 1-5 L-shaped. The bottom wall of the first mounting groove 1-1 is recessed in the direction away from the valve port to form the second mounting groove 1-3. The circumferential outer wall of the first connecting member 823 is fixedly connected to the circumferential inner wall of the second mounting groove 1-3, which can further prevent the guide seat 820 from rotating, wherein the fixed connection includes a detachable movable connection. The circumferential outer wall of the first connecting member 823 specifically refers to an annular wall roughly along the axial direction of the valve. The circumferential inner wall of the second mounting groove 1-3 specifically refers to an annular inner wall along the axial direction of the valve.

[0073] The circumferential outer wall of the first connecting member 823 and the circumferential inner wall of the second mounting groove 1-3 can be fixedly connected by threaded connection. In order to avoid deformation of the guide seat 820 caused by the end of the first connecting member 823 away from the second connecting member 1-2 being squeezed against the bottom wall of the second mounting groove 1-3 during the threaded connection, after the first connecting member is installed, there is a gap between the end of the first connecting member 823 away from the second connecting member 1-2 and the bottom wall of the second mounting groove 1-3.

[0074] The specific installation process of the guide seat 820 is as follows: threading the guide seat 820 and the first seat body 1-5 until the second connecting member 1-2 fits with the first seat body 1-5, at which point the installation between the guide seat 820 and the first seat body 1-5 is in place; thereafter, installing the second seat body 1-6, specifically, making the second seat body 1-6 fit with the side of the second connecting member 1-2 away from the first seat body 1-5, and then fixing the second seat body 1-6 with the first seat body 1-5, at which point the guide seat 820 is pressed between the first seat body 1-5 and the second seat body 1-6, and the guide seat 820 is fixed.

[0075] like Figure 6 As shown, the electronic expansion valve also includes a mounting seat 1-7, the mounting seat 1-7 has a mounting cavity, the second seat body 1-6 is located in the mounting cavity, at least part of the first seat body 1-5 is located in the mounting cavity and connected to the mounting seat 1-7. The mounting seat 1-7 has a fluid inlet and a fluid outlet, the fluid inlet is connected to the inside of the second seat body 1-6, and the valve port 510 is connected to the fluid outlet.

[0076] like Figure 6 As shown, in one embodiment, the valve mouth portion 510 may be made of metal. To avoid the problem of poor sealing performance between the second valve needle 430 made of metal and the valve mouth portion 510 made of metal, the second valve needle 430 may be provided with a seal 1-4. The hardness of the seal 1-4 is less than the hardness of the valve mouth portion 510. The material of the seal 1-4 may be rubber or plastic. The seal 1-4 is sealed with the valve mouth portion 510 to ensure that no leakage occurs when the valve mouth portion 510 is closed.

[0077] 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.

[0078] 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. An electronic expansion valve, characterized in that: It comprises a valve core assembly (400) and a valve seat assembly (500), wherein the valve seat assembly (500) is provided with a valve opening portion (510), and the valve core assembly (400) can open or close the valve opening portion (510); The electronic expansion valve further comprises a guide seat (820), wherein the guide seat (820) is arranged at one end of the valve seat assembly (500) away from the valve mouth portion (510), and the valve core assembly (400) and the guide seat (820) are movably matched along a preset axial direction; The valve core assembly (400) and the guide seat (820) are limitedly matched along a circumferential direction around a preset axial direction.

2. The electronic expansion valve according to claim 1, characterized in that: The guide seat (820) is connected to the valve seat assembly (500) by interference fit.

3. The electronic expansion valve according to claim 1, characterized in that: It also includes a stop seat (800), and the top of the guide seat (820) extends into the stop seat (800).

4. The electronic expansion valve according to claim 1, characterized in that: The valve core assembly (400) includes a sliding nut (410), and the sliding nut (410) includes a nut body (411) and a stop protrusion (412). The stop protrusion (412) is fixedly arranged on the outer peripheral side of the nut body (411). The guide seat (820) is provided with a main body hole (821) and a limiting hole (822) connected to the main body hole (821). The nut body (411) and the main body hole (821) are movably matched along the preset axial direction. The stop protrusion (412) and the limiting hole (822) are movably matched along the preset axial direction and are limitedly matched along the circumferential direction around the preset axial direction.

5. The electronic expansion valve according to claim 4, characterized in that: The guide seat (820) is cylindrical, the main body hole (821) and the guide seat (820) are coaxially arranged, and the limiting hole (822) is arranged on the side wall of the guide seat (820) along the preset axial direction.

6. The electronic expansion valve according to claim 4, characterized in that: A first connecting member (823) is provided on the outer peripheral fixed sleeve of the guide seat (820).

7. The electronic expansion valve according to claim 6, characterized in that: The first connecting member (823) is provided with a through hole (824) penetrating the first connecting member along the preset axial direction, and the through hole (824) is connected to an end of the limiting hole (822) away from the main body hole (821).

8. The electronic expansion valve according to claim 1, characterized in that: The guide seat (820) is provided with a convex rib (825), and the valve seat assembly (500) is provided with a snap-in protrusion (520) corresponding to the convex rib (825). The snap-in protrusion (520) can be snapped into a groove formed after the convex rib (825) is deformed along the preset axial direction to prevent the guide seat (820) from rotating relative to the valve seat assembly (500).

9. The electronic expansion valve according to claim 1, characterized in that: The valve seat assembly (500) is provided with a first limiting protrusion (530) and a second limiting protrusion (540) which are arranged opposite to each other at one end close to the guide seat (820), and the guide seat (820) is clamped between the first limiting protrusion (530) and the second limiting protrusion (540).

10. The electronic expansion valve according to claim 1, characterized in that: The guide seat (820) is a metal part.

11. The electronic expansion valve according to claim 2, characterized in that: The valve seat assembly (500) comprises a first seat body (1-5) and a second seat body (1-6), wherein the first seat body (1-5) has a first mounting groove (1-1), and the end of the second seat body (1-6) is located in the first mounting groove (1-1); a second connecting member (1-2) is provided on the outer periphery of the guide seat (820), and the second connecting member (1-2) is clamped between the bottom wall of the first mounting groove (1-1) and the end of the second seat body (1-6).

12. The electronic expansion valve according to claim 11, characterized in that: There is a gap between the circumferential outer wall of the second connecting member (1-2) and the circumferential inner wall of the first installation groove (1-1).

13. The electronic expansion valve according to claim 11, characterized in that: A first connecting member (823) is also provided on the periphery of the guide seat (820), and the second connecting member (1-2) is located on the periphery of the first connecting member (823); the first seat body (1-5) has a second mounting groove (1-3), the bottom wall of the first mounting groove (1-1) is recessed in a direction away from the valve port to form the second mounting groove (1-3), and the circumferential outer wall of the first connecting member (823) is fixedly connected to the circumferential inner wall of the second mounting groove (1-3).

14. The electronic expansion valve according to claim 13, characterized in that: The circumferential outer wall of the first connecting member (823) is threadedly connected to the circumferential inner wall of the second mounting groove (1-3).

15. The electronic expansion valve according to claim 13, characterized in that: There is a gap between an end of the first connecting member (823) away from the second connecting member (1-2) and the bottom wall of the second installation groove (1-3).

16. The electronic expansion valve according to claim 1, characterized in that: The valve core assembly (400) comprises a second valve needle (430), the second valve needle (430) is provided with a sealing member (1-4), the hardness of the sealing member (1-4) is less than the hardness of the valve mouth (510), and the sealing member (1-4) is in sealing cooperation with the valve mouth (510).

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