Electronic expansion valve

Abstract

The present application relates to an electronic expansion valve (A). The electronic expansion valve (A) comprises a valve core assembly (400) and a valve seat assembly (500), the valve seat assembly (500) is provided with a valve port portion (510), and the valve core assembly (400) can open or close the valve port portion (510). The electronic expansion valve (A) further comprises a guide seat (820), the guide seat (820) is arranged at the end of the valve seat assembly (500) away from the valve port portion (510), and the valve core assembly (400) movably matches the guide seat (820) in a preset axial direction.

Description

Electronic expansion valve

[0001] Related applications

[0002] This application claims priority to Chinese patent application number 202323246160.8, filed on November 30, 2023, entitled “Electronic Expansion Valve”, priority to Chinese patent application number 202421651048.4, filed on July 12, 2024, entitled “Electronic Expansion Valve”, and priority to Chinese patent application number 202422362794.8, filed on September 26, 2024, entitled “Electronic Expansion Valve”, the entire text of which is hereby incorporated by reference. Technical Field

[0003] The present application relates to the field of valve body technology, and in particular to an electronic expansion valve. Background Art

[0004] An electronic expansion valve acts as a throttling element, regulating the flow of fluids. It consists of a rotor assembly, a screw, a valve core assembly, and a stopper. The rotor assembly drives the screw, which is partially threaded and threaded with external threads. The screw is then threadedly connected to the valve core assembly, which is then restrained by the stopper. As the rotor assembly rotates the screw, the valve core assembly moves only up and down along the valve axis.

[0005] 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.

[0006] Therefore, how to increase or decrease the difficulty of processing the stop seat is a technical problem that needs to be solved in this application. Summary of the Invention

[0007] Based on this, it is necessary to provide an electronic expansion valve to solve the problems of difficulty in machining and assembling the current stop seat.

[0008] The electronic expansion valve provided herein includes a valve core assembly and a valve seat assembly. The valve seat assembly has a valve opening, which the valve core assembly can open or close. The electronic expansion valve also includes a guide seat, which is disposed at an end of the valve seat assembly away from the valve opening. The valve core assembly and the guide seat are movable along a predetermined axial direction.

[0009] In one embodiment, the guide seat is connected to the valve seat assembly by interference fit.

[0010] In one embodiment, the electronic expansion valve further includes a stop seat, and the top of the guide seat extends into the stop seat.

[0011] In one embodiment, the valve core assembly includes a sliding portion, the sliding portion 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 channel and a limiting channel connected to the main channel, the nut body and the main channel are movably matched along a preset axial direction, the stop protrusion and the limiting channel are movably matched along the preset axial direction and are limited in the circumferential direction around the preset axial direction.

[0012] In one embodiment, the guide seat is cylindrical, the main body channel and the guide seat are coaxially arranged, and the limiting channel is arranged on the side wall of the guide seat along a preset axial direction.

[0013] In one embodiment, a first connecting piece is provided on the outer peripheral fixing sleeve of the guide seat.

[0014] In one embodiment, the first connecting member is provided with a through channel penetrating the first connecting member along a preset axial direction, and the through channel is connected to an end of the limiting channel away from the main body channel.

[0015] In one embodiment, the guide seat is provided with a convex rib, and the valve seat assembly is provided with a snap-fit ​​protrusion corresponding to the convex rib. The snap-fit ​​protrusion can be snapped into the groove formed after the convex rib is deformed along a preset axial direction to prevent the guide seat from rotating relative to the valve seat assembly.

[0016] In one embodiment, a first limiting protrusion and a second limiting protrusion are provided opposite to each other 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.

[0017] In one embodiment, the guide seat is a metal part.

[0018] In one embodiment, the valve seat assembly includes a first seat body and a second seat body, the first seat body having a first mounting groove, the end of the second seat body being located within the first mounting groove; a second connecting member is provided on the periphery of the guide seat, the second connecting member being sandwiched between the bottom wall of the first mounting groove and the end of the second seat body. 13. The electronic expansion valve of claim 11, wherein a gap is provided between the circumferential outer wall of the second connecting member and the circumferential inner wall of the first mounting groove.

[0019] In one embodiment, 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, and 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.

[0020] In one embodiment, the circumferential outer wall of the first connecting member is threadedly connected to the circumferential inner wall of the second mounting groove.

[0021] 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.

[0022] 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.

[0023] 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 difficulty of processing the guide seat.

[0024] In one embodiment, the valve seat assembly is provided with a valve cavity, and the valve mouth portion includes a first valve mouth; at least a portion of the guide seat is arranged in the valve cavity and fixedly connected to the valve seat assembly; wherein, one of the valve seat assembly and the guide seat with a larger material hardness is provided with a positioning protrusion, and the positioning protrusion is pressed against the other one, and the material hardness of the positioning protrusion is greater than the material hardness of the valve seat assembly or the guide seat it abuts, so as to position the valve seat assembly and the guide seat in the axial and circumferential directions.

[0025] In one embodiment, the cavity wall of the valve cavity is provided with a first positioning surface, the first positioning surface faces the guide seat, and the guide seat has a second positioning surface facing the first positioning surface; and the positioning protrusion is located on one of the first positioning surface and the second positioning surface, and the positioning protrusion abuts against the other one.

[0026] In one embodiment, the valve seat assembly includes a valve core sleeve and a valve cover connected along the axial direction, the valve core sleeve is provided with a first cavity extending along the axial direction, the valve cover is provided with a second cavity extending along the axial direction, and the first valve port is provided at an end of the valve core sleeve facing away from the valve cover; wherein the end surface of the valve core sleeve facing the end of the valve cover forms the first positioning surface.

[0027] In one embodiment, the positioning protrusion is arranged on the first positioning surface, and a first opening is provided at one end of the valve core sleeve facing the valve cover, and the first opening is connected to the first cavity, so that the end surface of the valve core sleeve facing the valve cover is annular; wherein, the positioning protrusion is arranged on the inner edge of the end surface.

[0028] In one embodiment, a cavity wall of the first cavity at the first opening is provided with an inclined surface, and the inclined surface is connected to the side surface of the positioning protrusion to form an integral guiding inclined surface.

[0029] In one embodiment, the cavity wall of the second cavity is provided with a third positioning surface, the third positioning surface faces the first positioning surface and is arranged at intervals in the axial direction, so that the valve cavity forms a positioning cavity located between the first positioning surface and the third positioning surface; the outer periphery of the guide seat is provided with a positioning boss, the positioning boss is at least partially accommodated in the positioning cavity, the positioning boss has a fourth positioning surface facing the valve cover, and the fourth positioning surface is pressed against the third positioning surface.

[0030] The details of one or more embodiments of the present application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the present application will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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.

[0032] FIG1 is a schematic structural diagram of an electronic expansion valve according to an embodiment of the present application.

[0033] FIG2 is a cross-sectional view of an electronic expansion valve according to an embodiment of the present application.

[0034] FIG3 is a schematic structural diagram of a rotor assembly and a guide rod according to an embodiment of the present application.

[0035] FIG4 is a partial exploded view of an electronic expansion valve according to an embodiment of the present application.

[0036] FIG5 is a schematic structural diagram of a guide seat according to an embodiment of the present application.

[0037] FIG6 is a schematic diagram of the installation position of a guide seat according to an embodiment of the present application.

[0038] FIG7 is a schematic structural diagram of a first seat body according to an embodiment of the present application.

[0039] FIG8 is a schematic diagram of another structure of a guide seat according to an embodiment of the present application.

[0040] FIG9 is an axial cross-sectional view of the electronic expansion valve shown in FIG1 .

[0041] FIG10 is an enlarged schematic diagram of portion C in FIG9 .

[0042] FIG11 is a schematic three-dimensional structural diagram of some components of the electronic expansion valve shown in FIG1 .

[0043] FIG12 is a three-dimensional exploded cross-sectional view of FIG11.

[0044] FIG13 is a schematic diagram of the three-dimensional structure of the valve core sleeve shown in FIG11.

[0045] FIG14 is a schematic diagram of the three-dimensional structure of the valve core sleeve of the electronic expansion valve according to an embodiment of the present application.

[0046] Figure numerals: A, electronic expansion valve; 100, housing; 200, rotor assembly; 300, screw rod; 400, valve core assembly; 410, sliding portion; 411, nut body; 412, anti-rotation protrusion; 420, first valve needle; 430, second valve needle; 431, regulating channel; 440, valve core sleeve; 4401, first opening; 4402, guide slope; 442, valve cover; 4421, third positioning surface; 500, valve seat assembly; 510, valve port; 511, first valve port; 512, first positioning surface; 513, positioning protrusion; 520, clamping protrusion; 530, first limiting protrusion; 540, second Limiting protrusion; 600, stopping ring; 700, guide rod; 800, stopping seat; 810, outer guide rail portion; 820, guide seat; 821, main channel; 8210, positioning boss; 82101, second positioning surface; 82102, fourth positioning surface; 822, limiting channel; 823, first connecting member; 824, through channel; 825, 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; 101, valve chamber. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0048] 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 device or element referred to 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.

[0049] 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.

[0050] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0051] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it 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. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0052] 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 an intermediate 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 an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are intended only to describe specific embodiments and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0054] Referring to Figures 1 to 5, the present application provides an electronic expansion valve A, 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 disposed on the outside of the rotor assembly 200, a portion of the screw rod 300, and a portion of the valve core assembly 400 and is welded to the valve seat assembly 500. The stator assembly is sleeved on the outside of the housing 100, and the stator assembly is capable of driving the rotor assembly 200 to rotate. The valve seat assembly 500 is provided with a valve opening 510, and the valve core assembly 400 is capable of moving 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. The rotor assembly 200 can drive the valve core assembly 400 to move toward or away from the valve opening 510 through the screw rod 300.

[0055] The electronic expansion valve A also includes a stop ring 600, a guide rod 700, and a stop seat 800. The stop seat 800 is mounted on the outside of the lead screw 300 and fixedly connected to the valve seat assembly 500. An outer guide rail portion 810 (an externally threaded guide rail in this embodiment) is provided on the outer circumference of the stop seat 800, facing away from the lead screw 300. The stop ring 600 is mounted on the outer circumference of the stop seat 800 and flexibly engages with the outer guide rail portion 810. The guide rod 700 is fixedly connected to the rotor assembly 200 or the lead screw 300. The rotor assembly 200 can drive the guide rod 700 to push the stop ring 600 to spiral along the outer guide rail portion 810.

[0056] The valve core assembly 400 includes a sliding portion 410, a first valve needle 420, and a second valve needle 430. The end of the screw rod 300, remote from the rotor assembly 200, is threadedly engaged with the sliding portion 410. The screw rod 300 drives the sliding portion 410, which in turn drives the second valve needle 430 via the first valve needle 420 to open or close the valve port 510. The second valve needle 430 is provided with an adjustment channel 431 that communicates with the valve port 510. The flow area of ​​the adjustment channel 431 is smaller than that of the valve port 510. The screw rod 300 drives the sliding portion 410 to engage the first valve needle 420 with the adjustment channel 431 to control the amount of liquid entering the adjustment channel 431.

[0057] In this way, the screw rod 300 can be rotated along the preset direction first to drive the sliding part 410 to drive the first valve needle 420 and the second valve needle 430 to close the valve mouth part 510. Then, the screw rod 300 can be rotated in the direction opposite to the preset direction to drive the sliding part 410 to drive the first valve needle 420 to move in the direction away from the regulating channel 431, thereby achieving fine-tuning of the liquid inlet amount at the regulating channel 431.

[0058] In some embodiments, the sliding portion 410 is a sliding nut.

[0059] In one embodiment, the electronic expansion valve A 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. The connection herein includes 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 engaged along the axial direction of the screw rod 300 via the first elastic member 910.

[0060] 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 the 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.

[0061] Specifically, in one embodiment, the first elastic member 910 is a compression spring or a metal spring.

[0062] In one embodiment, the electronic expansion valve A further comprises 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.

[0063] 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 .

[0064] 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 portion 410 .

[0065] In this way, it is helpful to control the magnitude of the driving force exerted by the second elastic member 920 on the second valve needle 430 .

[0066] In one embodiment, as shown in Figures 2, 4, and 5, the electronic expansion valve A further comprises a guide seat 820. The guide seat 820 is disposed at one end of the stop seat 800 near the valve opening 510 and is connected to the valve seat assembly 500. The sliding portion 410 and the guide seat 820 are movably engaged along a predetermined axial direction. The valve core assembly 400 and the guide seat 820 are engaged in a circumferential direction around the predetermined axial direction. Therefore, there is no need to machine a sliding groove on the stop seat 800 to engage with the valve core assembly 400. Instead, a separate guide seat 820 can be machined, reducing the difficulty of designing a rotation restriction for the valve core assembly 400.

[0067] 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 .

[0068] 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 A are all in the same direction, that is, in the electronic expansion valve A, the components such as the screw rod 300, the stop seat 800 and the valve core assembly 400 are all coaxially arranged.

[0069] 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.

[0070] 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.

[0071] In this way, the wear resistance of the guide seat 820 axially matched with the sliding portion 410 is increased, and the processing cost of the guide seat 820 is reduced.

[0072] Furthermore, in one embodiment, as shown in Figures 2 and 4, the sliding portion 410 includes a nut body 411 and a stop protrusion 412, the stop protrusion 412 is fixed to the outer peripheral side of the nut body 411, the guide seat 820 is provided with a main channel 821 and a limiting channel 822 connected to the main channel 821, the nut body 411 and the main channel 821 are movably matched along a preset axial direction, the stop protrusion 412 and the limiting channel 822 are movably matched along the preset axial direction and are limited in the circumferential direction around the preset axial direction.

[0073] That is to say, the anti-rotation protrusion 412 does not affect the movable cooperation between the sliding part 410 and the guide seat 820 along the preset axis. However, under the limiting action of the limiting channel 822, the anti-rotation protrusion 412 cannot rotate around the preset axis, that is, the sliding part 410 cannot rotate relative to the guide seat 820.

[0074] In one embodiment, both the main channel 821 and the limiting channel 822 penetrate the guide seat 820 along a preset axial direction.

[0075] Specifically, the number of anti-rotation protrusions 412 can be one or more. For example, when the number of anti-rotation protrusions 412 is two, the two anti-rotation protrusions 412 are arranged at the two opposite ends of the nut body 411. For the convenience of processing, multiple anti-rotation protrusions 412 are evenly spaced along the direction around the preset axial direction.

[0076] In one embodiment, as shown in Figures 2, 4, and 5, the guide seat 820 is cylindrical, the main channel 821 and the guide seat 820 are coaxially arranged, and the limiting channel 822 passes through the side wall of the guide seat 820 along a predetermined axial direction. Of course, the limiting channel 822 may not pass through the side wall of the guide seat 820.

[0077] It should be noted that when a limiting channel 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.

[0078] 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 channel 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 divided by the limiting channel 822. In order to improve the structural strength of the guide seat 820, in this embodiment, as shown in Figures 2, 4 and 5, the outer periphery of the guide seat 820 is fixedly sleeved with a first connecting member 823. 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 integrally formed.

[0079] Furthermore, when the length of the anti-rotation protrusion 412 continues to extend, in one embodiment, as shown in Figures 2, 4 and 5, the first connecting member 823 is provided with a through channel 824 that penetrates itself along a preset axial direction, and the through channel 824 is connected to the end of the limiting channel 822 away from the main channel 821.

[0080] In one embodiment, as shown in Figures 4 and 5 , a rib 825 is formed on one end of the guide seat 820 near the valve opening 510. The valve seat assembly 500 is provided with a snap-fit ​​protrusion 520 corresponding to the protrusion 825. The snap-fit ​​protrusion 520 can snap into the protrusion 825 along a predetermined axial direction to prevent the guide seat 820 from rotating relative to the valve seat assembly 500. Thus, during assembly, the guide seat 820 can be pressed along the predetermined axial direction, causing the snap-fit ​​protrusion 520 to snap into the protrusion 825, thereby preventing the guide seat 820 from rotating relative to the valve seat assembly 500.

[0081] Specifically, the number of the clamping protrusions 520 can 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.

[0082] However, the present invention is not limited thereto. In another embodiment, the rib 825 may also be provided on the valve seat assembly 500 , and the guide seat 820 may be provided with a snap-fit ​​protrusion 520 corresponding to the rib 825 .

[0083] In one embodiment, as shown in FIG. 4 , a first limiting protrusion 530 and a second limiting protrusion 540 are provided at one end of the valve seat assembly 500 close to the guide seat 820 , and the guide seat 820 is sandwiched between the first limiting protrusion 530 and the second limiting protrusion 540 .

[0084] In this way, the guide seat 820 can be limited to prevent the guide seat 820 from tilting when the rib 825 is deformed.

[0085] As shown in Figures 6-8, 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 within the first mounting groove 1-1. The second connecting member 1-2 is provided on the outermost 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. The bottom wall of the first mounting groove 1-1 has a through hole extending therethrough, 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 axis are respectively in contact with the first seat body 1-5 and the second seat body 1-6. 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.

[0086] A gap exists between the circumferential outer wall of the second connector 1-2 and the circumferential inner wall of the first mounting groove 1-1. This prevents the second connector 1-2 from being too large in the valve radial direction, which could make installation within the first seat 1-5 difficult. The circumferential outer wall of the second connector 1-2 specifically refers to the annular sidewall located between the two end faces of the second connector 1-2. The circumferential inner wall of the first mounting groove 1-1 specifically refers to the annular inner wall extending along the valve axial direction.

[0087] 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.

[0088] 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 a threaded connection. To prevent the guide seat 820 from being deformed 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 process, a gap is provided 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 after the first connecting member is installed.

[0089] The specific installation process of the guide seat 820 is as follows: thread the guide seat 820 and the first seat body 1-5 until the second connecting piece 1-2 fits with the first seat body 1-5. At this time, the installation between the guide seat 820 and the first seat body 1-5 is in place; thereafter, the second seat body 1-6 is installed, specifically, the second seat body 1-6 is fit with the side of the second connecting piece 1-2 away from the first seat body 1-5, and then the second seat body 1-6 is fixedly connected to the first seat body 1-5. At this time, 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.

[0090] As shown in Figure 6, the electronic expansion valve A further comprises a mounting seat 1-7, which defines a mounting cavity within the mounting seat 1-7. The second mounting body 1-6 is positioned within the mounting cavity, and at least a portion of the first mounting body 1-5 is positioned within 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 communicates with the interior of the second mounting body 1-6, and the valve port 510 communicates with the fluid outlet.

[0091] As shown in Figure 6, in one embodiment, the material of the valve mouth part 510 can be metal. In order to avoid the problem of poor sealing performance between the second valve needle 430 made of metal and the valve mouth part 510 made of metal, the second valve needle 430 can be provided with a seal 1-4. The hardness of the seal 1-4 is less than the hardness of the valve mouth part 510. The material of the seal 1-4 can be rubber or plastic. The seal 1-4 is sealed with the valve mouth part 510 to ensure that no leakage occurs when the valve mouth part 510 is closed.

[0092] As shown in Figures 1, 9, and 10, in one embodiment of the present disclosure, the valve seat assembly 500 is provided with a valve cavity 101, which is provided with a first valve port 511. At least a portion of the guide seat 820 is disposed within the valve cavity 101 of the valve seat assembly 500 and is fixedly connected to the valve seat assembly 500. The material hardness of the guide seat 820 is less than that of the valve seat assembly 500. Accordingly, a first positioning surface 512 is provided on the wall of the valve cavity 101. The first positioning surface 512 faces the guide seat 820 and is located on the side of the guide seat 820 facing the first valve port 511. The guide seat 820 has a second positioning surface 82101 facing the first positioning surface 512. The first positioning surface 512 is provided with a positioning protrusion 513. Accordingly, the positioning protrusion 513 presses against the guide seat 820 (e.g., the second positioning surface 82101), causing the guide seat 820, whose material hardness is relatively low, to deform, thereby achieving the positioning function of the valve seat assembly 500 and the guide seat 820 in the axial and circumferential directions. Through the above-mentioned structural design, the present disclosure can utilize the positioning protrusion 513 to press against the valve seat assembly 500 or the guide seat 820, causing them to deform. As a result, the deformed guide seat 820 cooperates with the valve seat assembly 500 at the circumferential upper limit position, preventing the guide seat 820 and the valve seat assembly 500 from rotating relative to each other in the circumferential direction or from displacing relative to each other in the axial direction, thereby achieving reliable positioning of the guide seat 820.

[0093] It should be noted that, in an embodiment not shown in the present disclosure, the material hardness of the guide seat 820 may also be greater than the material hardness of the valve seat assembly 500. Based on this, a positioning protrusion 513 may be provided on the guide seat 820, i.e., the positioning protrusion 513 is located on the second positioning surface 82101. Accordingly, the positioning protrusion 513 presses against the valve seat assembly 500 (e.g., the first positioning surface 512), causing the valve seat assembly 500, whose material hardness is relatively low, to deform, thereby achieving the positioning function of the valve seat assembly 500 and the guide seat 820 in the axial and circumferential directions. In other words, in various possible embodiments consistent with the design concepts of the present disclosure, the material hardness of the guide seat 820 is different from that of the valve seat assembly 500, and the one with the higher material hardness is provided with the positioning protrusion 513, which is located on the first positioning surface 512 or the second positioning surface 82101, and presses against the other of the valve seat assembly 500 and the guide seat 820 (i.e., the one with the lower material hardness).

[0094] As shown in FIG9 , in one embodiment of the present disclosure, the electronic expansion valve proposed in the present disclosure includes a valve core assembly 400. The valve core assembly 400 is disposed in the valve cavity 101 of the valve seat assembly 500. The valve core assembly 400 can move axially within the valve cavity 101 to open or close the first valve port 511 (specifically, this can be achieved by the first valve needle of the valve core assembly 400). The valve core assembly 400 is provided with a sliding portion 410. The sliding portion 410 slidably cooperates with a guide seat 820. The end of the guide seat 820 facing away from the first valve port 511 abuts against the end wall of the valve cavity 101 away from the first valve port 511.

[0095] As shown in Figure 13, in one embodiment of the present disclosure, a reference plane perpendicular to the axial direction and parallel to the radial direction is defined, and the orthographic projection of the positioning protrusion 513 on this reference plane can be a closed ring. Through the above structural design, the present disclosure designs the positioning protrusion 513 as a closed ring structure, thereby achieving pressure-pressing positioning against the guide seat 820 at various positions in the circumferential direction. This also helps to simplify the structural complexity of the valve seat assembly 500 when providing the positioning protrusion 513, reducing the difficulty of manufacturing.

[0096] Referring to FIG. 14 , FIG. 14 representatively shows a three-dimensional structural diagram of a valve core sleeve 440 in another exemplary embodiment of an electronic expansion valve that can embody the principles of the present disclosure.

[0097] Different from the embodiment shown in FIG13, in which the positioning protrusion 513 is a closed annular structure, as shown in FIG14, in another embodiment of the present disclosure, the first positioning surface 512 (or the second positioning surface 82101) can be provided with two positioning protrusions 513. On this basis, a reference plane perpendicular to the axial direction and parallel to the radial direction is defined, and on this reference plane, the orthographic projections of the two positioning protrusions 513 can be arranged at intervals along a closed annular path. Through the above structural design, the present disclosure adopts a plurality of disconnected structural forms for the positioning protrusion 513, thereby being able to further press the end of the positioning protrusion 513 in the extension direction (e.g., the above-mentioned annular path, i.e., the circumferential direction) against the guide seat 820, thereby further improving the positioning effect of the guide seat 820. In some embodiments, the first positioning surface 512 can also be provided with three or more positioning protrusions 513, and the orthographic projections of these positioning protrusions 513 are arranged at intervals along a closed annular path, and are not limited to the above embodiment.

[0098] As shown in Figure 14 , based on the structural design of the first positioning surface 512 being provided with at least two positioning protrusions 513, in one embodiment of the present disclosure, the shapes of the positioning protrusions 513 can be identical, and the at least two positioning protrusions 513 can be evenly arranged along the aforementioned annular path. Through this structural design, the present disclosure can achieve a more uniform positioning effect of the positioning protrusions 513 at various positions of the guide seat 820.

[0099] In an embodiment not shown in the present disclosure, when the positioning protrusions 513 are arranged along an annular path, there may be only one positioning protrusion 513 arranged along one annular path, and the shape may be non-closed, such as but not limited to a "C" shape, and is not limited to the above embodiment.

[0100] In an embodiment not shown in the figures of the present disclosure, the first positioning surface 512 (or the second positioning surface 82101) can be provided with at least two positioning protrusions 513, and the at least two positioning protrusions 513 can be arranged at intervals in the radial direction. For example, taking the positioning protrusion 513 in a closed annular structure shown in FIG13 as an example, on this basis, the first positioning surface 512 can be provided with two or more positioning protrusions 513, and these positioning protrusions 513 are arranged at intervals in the radial direction in the form of rings one inside the other. For another example, taking the at least two annular protrusions arranged at intervals on the annular path shown in FIG14 as an example, on this basis, the first positioning surface 512 can be provided with two groups or more than two groups of positioning protrusions 513, wherein at least one group of positioning protrusions 513 can adopt the above-mentioned structural design of FIG7, for example, and the remaining groups of positioning protrusions 513 can adopt a similar structural design, or can adopt the above-mentioned structural design of FIG6, for example. For another example, unlike the structural design in which the positioning protrusions 513 are arranged along an annular path in the embodiments shown in Figures 13 or 14, in other embodiments of the present disclosure, the positioning protrusions 513 may not be arranged along an annular path (whether closed or not). On this basis, the first positioning surface 512 may be provided with at least two positioning protrusions 513, and these two positioning protrusions 513 are arranged radially at intervals.

[0101] As shown in Figure 10, in one embodiment of the present disclosure, the cross section of the positioning protrusion 513 can be triangular. In other embodiments, the cross section of the positioning protrusion 513 can also be other shapes, such as but not limited to trapezoidal, rectangular, arc-shaped, etc.

[0102] As shown in Figures 1 and 9 to 12, in one embodiment of the present disclosure, the valve seat assembly 500 may include a valve core sleeve 440 and a valve cover 442 connected axially. The valve core sleeve 440 is provided with a first cavity extending axially therethrough, and the valve cover 442 is provided with a second cavity extending axially therethrough. A first valve port 511 is provided at the end of the valve core sleeve 440 facing away from the valve cover 442. Accordingly, the end surface of the valve core sleeve 440 facing the valve cover 442 may partially form a first positioning surface 512. Through the above-described structural design, the present disclosure utilizes the assembled valve core sleeve 440 and valve cover 442 to clamp the guide seat 820. Specifically, a portion of the end surface of the valve core sleeve 440 facing the valve cover 442 is provided with a positioning protrusion 513 to achieve a positioning function, while the other portion directly participates in the fixed assembly of the guide seat 820. Accordingly, the present disclosure can achieve the purpose of machining the positioning protrusion 513 during the manufacture of the valve core sleeve 440, which helps reduce the difficulty of assembly and component processing.

[0103] As shown in Figures 12 and 13 , based on the structural design of the valve seat assembly 500 including the valve core sleeve 440 and the valve cover 442, in one embodiment of the present disclosure, a positioning protrusion 513 is provided on the valve seat assembly 500 and located on the first positioning surface 512. The end of the valve core sleeve 440 facing the valve cover 442 can be provided with a first opening 4401, which is connected to the first cavity of the valve seat assembly 500. Accordingly, the end surface of the valve core sleeve 440 facing the valve cover 442 is annular. On this basis, the positioning protrusion 513 can be provided on the inner edge of the above-mentioned end surface, that is, radially, the positioning protrusion 513 is spaced apart from the outer edge of the end surface, thereby achieving that a portion of the end surface directly serves as the above-mentioned first positioning surface 512. In other embodiments, the positioning protrusion 513 may also be arranged in the middle of the above-mentioned end face, that is, along the radial direction, the positioning protrusion 513 is spaced apart from the inner edge and outer edge of the end face, or the positioning protrusion 513 may also be arranged at the outer edge of the above-mentioned end face, which is not limited to the above-mentioned embodiments.

[0104] As shown in Figure 10, based on the structural design that the positioning protrusion 513 is arranged on the inner edge of the end face of the valve core sleeve 440, in one embodiment of the present disclosure, the first cavity of the valve core sleeve 440 can be provided with a slope on the cavity wall at its first opening 4401, and the slope is connected to the side surface of the positioning protrusion 513 (for example, the cross-section of the positioning protrusion 513 can be triangular, trapezoidal, etc., then the side surface is also a slope) to form an integrated guide slope 4402.

[0105] As shown in FIG10 , based on the structural design of the valve seat assembly 500 including the valve core sleeve 440 and the valve cover 442, in one embodiment of the present disclosure, the cavity wall of the second cavity of the valve cover 442 may be provided with a third positioning surface 4421. The third positioning surface 4421 faces the first positioning surface 512 and is spaced apart in the axial direction, so that the valve cavity 101 forms a positioning cavity located between the first positioning surface 512 and the third positioning surface 4421. On this basis, the outer periphery of the guide seat 820 may be provided with a positioning boss 8210. The positioning boss 8210 is at least partially accommodated in the positioning cavity. The positioning boss 8210 has a fourth positioning surface 82102 facing the valve cover 442. The fourth positioning surface 82102 presses against the third positioning surface 4421. The positioning protrusion 513 presses against the side surface of the positioning boss 8210 facing the valve core sleeve 440. In other words, the side surface of the positioning boss 8210 facing the valve core sleeve 440 serves as the second positioning surface 82101.

[0106] In one embodiment of the present disclosure, the material hardness of the guide seat 820 can be less than the material hardness of the valve core sleeve 440, and the material hardness of the guide seat 820 can be greater than the material hardness of the sliding portion 410. For example, the sliding portion 410 can be a guide nut made of plastic, the guide seat 820 can be made of aluminum alloy or brass, and the valve core sleeve 440 can be made of stainless steel.

[0107] Based on the structural design of the valve seat assembly 500 including the valve core sleeve 440 and the valve cover 442, in one embodiment of the present disclosure, the guide seat 820 can be pressed into the valve cover 442 (e.g., the second cavity) by means of an interference fit. Accordingly, in a hot or cold fluid environment, the guide seat 820 may expand or contract with heat, causing the connection between the guide seat 820 and the valve cover 442 to become loose, and therefore it is necessary to increase the fixing strength of the guide seat 820. The guide seat 820 is pressed between the valve cover 442 and the valve core sleeve 440 and deformed, and is clamped by the valve cover 442 and the valve core sleeve 440. At the same time, the deformed guide seat 820 and the valve core sleeve 440 are limited circumferentially to prevent the guide seat 820 from rotating.

[0108] It should be noted that the electronic expansion valves shown in the drawings and described in this specification are only a few examples of the many types of electronic expansion valves that can employ the principles of the present disclosure. It should be clearly understood that the principles of the present disclosure are in no way limited to any details or any components of the electronic expansion valves shown in the drawings or described in this specification.

[0109] In summary, the electronic expansion valve proposed in some embodiments of the present disclosure includes a valve seat assembly 500 and a guide seat 820; the valve seat assembly 500 is provided with a valve cavity 101, and the valve cavity 101 is provided with a first valve port 511; at least a portion of the guide seat 820 is provided in the valve cavity 101 and is fixedly connected to the valve seat assembly 500, and the material hardness of the guide seat 820 is different from the material hardness of the valve seat assembly 500; wherein the cavity wall of the valve cavity 101 is provided with a first positioning surface 512, and the first positioning surface 512 faces the guide seat 820. The seat 820 is located on the side of the guide seat 820 facing the first valve port 511. The guide seat 820 has a second positioning surface 82101 facing the first positioning surface 512. The valve seat assembly 500 and the guide seat 820, whichever is made of a harder material, are provided with a positioning protrusion 513. The positioning protrusion 513 presses against the other of the valve seat assembly 500 and the guide seat 820. The positioning protrusion 513 is located on the first positioning surface 512 or the second positioning surface 82101. The positioning protrusion 513 is used to position the valve seat assembly 500 and the guide seat 820 in the axial and circumferential directions. Through the above structural design, the present disclosure can use the positioning protrusion 513 to press against the valve seat assembly 500 or the guide seat 820 to cause it to deform. As a result, the deformed guide seat 820 cooperates with the valve seat assembly 500 in the circumferential upper limit position, preventing the guide seat 820 and the valve seat assembly 500 from rotating relative to each other in the circumferential direction or displacing relative to each other in the axial direction, thereby achieving reliable positioning of the guide seat 820.

[0110] 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.

[0111] 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: It comprises a valve core assembly and a valve seat assembly, wherein the valve seat assembly is provided with a valve port portion, and the valve core assembly can open or close the valve port 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 mouth, and the valve core assembly and the guide seat are movably matched along a preset axial direction. The valve core assembly and the guide seat are limitedly matched along a circumferential direction around the preset axial direction.

2. The electronic expansion valve according to claim 1, wherein: The stop seat is connected to the valve seat assembly, and the stop seat is not connected to the guide seat.

3. The electronic expansion valve according to claim 2, wherein: A portion of the stop seat extends into the valve seat assembly, and / or a portion of the guide seat extends into the stop seat.

4. The electronic expansion valve according to claim 1, wherein: The valve core assembly includes a sliding portion, which includes a nut body and a stop protrusion, the stop protrusion is fixedly arranged on the outer peripheral side of the nut body, the guide seat is provided with a main channel and a limiting channel connected to the main channel, the nut body and the main channel are movably matched along the preset axial direction, the stop protrusion and the limiting channel are movably matched along the preset axial direction and are limitedly matched along the circumferential direction around the preset axial direction; the limiting channels are arranged on both sides of the main channel along the preset axial direction.

5. The electronic expansion valve according to claim 4, wherein: The outer peripheral fixing sleeve of the guide seat is provided with a first connecting piece; the first connecting piece is provided with a through passage penetrating through the first connecting piece along the preset axial direction, and the through passage is connected to an end of the limiting passage away from the main body passage.

6. The electronic expansion valve according to claim 1, wherein: The guide seat is provided with a convex rib, and the valve seat assembly is provided with a clamping protrusion corresponding to the convex rib. The clamping protrusion can be clamped into a groove formed by deformation of the convex rib along the preset axial direction to prevent the guide seat from rotating relative to the valve seat assembly.

7. The electronic expansion valve according to claim 1, wherein: One end of the valve seat assembly close to the guide seat is provided with a first limiting protrusion and a second limiting protrusion which are arranged opposite to each other, and the guide seat is sandwiched between the first limiting protrusion and the second limiting protrusion.

8. The electronic expansion valve according to claim 1, wherein: The guide seat is a metal part.

9. The electronic expansion valve according to claim 1, wherein: The valve seat assembly comprises a first seat body and a second seat body; a second connecting member is arranged on the outer periphery of the guide seat, and the second connecting member is sandwiched between the first seat body and the second seat body.

10. The electronic expansion valve according to claim 9, wherein: The first seat body or the second seat body has a first mounting groove, at least part of the second connecting member is located in the first mounting groove and fits with the bottom wall of the first mounting groove, and the circumferential outer wall of the second connecting member fits with the circumferential inner wall of the first mounting groove or has a gap.

11. The electronic expansion valve according to claim 9, wherein: A first connecting member is also 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 or the second seat body has a second mounting groove, and the bottom wall of the first mounting groove is recessed in the 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.

12. The electronic expansion valve according to claim 11, wherein: The circumferential outer wall of the first connecting member is threadedly connected to the circumferential inner wall of the second mounting groove, and a gap is provided between an end of the first connecting member away from the second connecting member and the bottom wall of the second mounting groove.

13. The electronic expansion valve according to claim 1, wherein: The valve core assembly comprises 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.

14. The electronic expansion valve according to claim 1, wherein: The valve seat assembly is provided with a valve cavity, and the valve port portion includes a first valve port; At least a portion of the guide seat is disposed in the valve cavity and is fixedly connected to the valve seat assembly; Among them, one of the valve seat assembly and the guide seat with a larger material hardness is provided with a positioning protrusion, and the positioning protrusion is pressed against the other one. The material hardness of the positioning protrusion is greater than the material hardness of the valve seat assembly or the guide seat it abuts against, so as to position the valve seat assembly and the guide seat in the axial and circumferential directions.

15. The electronic expansion valve according to claim 14, wherein: The cavity wall of the valve cavity is provided with a first positioning surface, the first positioning surface faces the guide seat, and the guide seat has a second positioning surface facing the first positioning surface; and the positioning protrusion is located on one of the first positioning surface and the second positioning surface, and the positioning protrusion abuts against the other one.

16. The electronic expansion valve according to any one of claims 14 to 15, wherein: The valve seat assembly includes a valve core sleeve and a valve cover connected along the axial direction, the valve core sleeve is provided with a first cavity extending along the axial direction, the valve cover is provided with a second cavity extending along the axial direction, and the first valve port is provided at an end of the valve core sleeve facing away from the valve cover; wherein the end surface of the valve core sleeve facing one end of the valve cover forms the first positioning surface.

17. The electronic expansion valve according to claim 16, wherein: The positioning protrusion is arranged on the first positioning surface, and a first opening is arranged at one end of the valve core sleeve facing the valve cover, and the first opening is connected to the first cavity, so that the end surface of the valve core sleeve facing the valve cover is annular; wherein the positioning protrusion is arranged on the inner edge of the end surface.

18. The electronic expansion valve according to claim 17, wherein: The cavity wall of the first cavity at the first opening is provided with an inclined surface, and the inclined surface is connected with the side surface of the positioning protrusion to form an integrated guiding inclined surface.

19. The electronic expansion valve according to claim 18, wherein: The cavity wall of the second cavity is provided with a third positioning surface, and the third positioning surface faces the first positioning surface and is arranged at intervals in the axial direction, so that the valve cavity forms a positioning cavity located between the first positioning surface and the third positioning surface; the outer periphery of the guide seat is provided with a positioning boss, and the positioning boss is at least partially accommodated in the positioning cavity, and the positioning boss has a fourth positioning surface facing the valve cover, and the fourth positioning surface is pressed against the third positioning surface.

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