Electronic expansion valve

Abstract

The electronic expansion valve comprises a valve body assembly, a valve element assembly, a screw rod and a stop seat assembly. The valve body assembly is provided with a first valve port. The valve element assembly is used for closing or opening the first valve port. The screw rod comprises a rod body and a first stopping part, the rod body is in threaded connection with the valve element assembly, and the first stopping part is fixedly connected with the rod body; the stop seat assembly is connected with the valve body assembly and arranged on the periphery of the screw in a sleeving mode. The stop seat assembly is provided with a second stop part in stop fit with the first stop part, and the second stop part is located on the side, facing the first valve port, of the first stop part. The first stop part can move between a first position and a second position relative to the second stop part; when the valve element assembly is located at the first position, the first stopping part makes contact with the second stopping part, when the valve element assembly is located at the second position, the first valve port is closed by the valve element assembly, and a target gap is formed between the first stopping part and the second stopping part. And when the first stop part moves from the first position to the second position, the supply pulse number of the electronic expansion valve is a valve opening pulse point.

Description

Technical Field

[0001] This application relates to the technical field of valves, and more particularly, to an electronic expansion valve. Background Art

[0002] An electronic expansion valve is a valve used to regulate the refrigerant flow. After there is a demand for opening the valve, the electronic expansion valve needs to be adjusted from the closed state to the open state. Specifically, when the electronic expansion valve changes from the closed state (corresponding to zero pulse supply number of the electronic expansion valve) to just the preset flow value appearing, the electronic expansion valve is at the valve opening pulse point position. At this position, the pulse supply number of the electronic expansion valve is the valve opening pulse point. When the pulse supply number is zero, the flow rate of the electronic expansion valve is zero or has a certain flow rate. After the valve opening pulse point, the flow rate increases with the increase of the pulse supply number. Therefore, the accuracy (consistency) of its valve opening pulse point position is related to the regulation accuracy (consistency) of the flow rate, and how to ensure the consistency of the valve opening pulse point becomes very important.

[0003] In the related art, usually the method of testing the gas flow rate is adopted to determine the valve opening pulse point, but this measurement method has many disadvantages, such as time delay in reading the flow meter, accuracy of the flow meter, stability of the air pressure, low efficiency, etc., which easily lead to changes in the position of the valve opening pulse point, and further lead to poor consistency of the valve opening pulse point, resulting in inaccurate measurement of the fluid flow curve and inability to accurately control the flow rate. Summary of the Utility Model

[0004] The embodiments of this application provide an electronic expansion valve to solve the problem of poor consistency of the valve opening pulse point existing in the related art.

[0005] The electronic expansion valve of the embodiments of this application includes:

[0006] A valve body assembly having an inner cavity, and the cavity wall of the inner cavity has a first valve port;

[0007] A valve core assembly movably located in the inner cavity for closing or opening the first valve port;

[0008] A screw rod including a rod body and a first stop portion, the rod body being screwed to the valve core assembly for driving the valve core assembly to move, and the first stop portion being fixedly connected to the rod body; and

[0009] A stop seat assembly connected to the valve body assembly and sleeved on the outer periphery of the screw rod; the stop seat assembly has a second stop portion that is in stop cooperation with the first stop portion, and the second stop portion is located on the side of the first stop portion facing the first valve port;

[0010] Wherein, the first stop portion is movable between a first position and a second position relative to the second stop portion. When the first stop portion is located at the first position, the first stop portion contacts the second stop portion; when the first stop portion is located at the second position, the valve core assembly closes the first valve port, and there is a target gap between the first stop portion and the second stop portion; when the first stop portion moves from the second position to the first position, the supply pulse number of the electronic expansion valve is the valve opening pulse point.

[0011] According to some embodiments of the present application, a spiral guide groove is provided on the outer periphery of the stop seat assembly, and a third stop portion is provided at one end of the spiral guide groove close to the first valve port;

[0012] The electronic expansion valve further includes a stop ring wound in the spiral guide groove and having a first stop head that is in stop cooperation with the third stop portion;

[0013] Wherein, when the first stop portion is located at the second position, the third stop portion is in stop contact with the first stop head.

[0014] According to some embodiments of the present application, the first stop portion is annular and fixedly sleeved on the outer periphery of the rod body; or, the first stop portion is annular and integrally provided with the rod body.

[0015] According to some embodiments of the present application, the stop seat assembly further includes a seat body sleeved on the outer periphery of the screw rod;

[0016] The second stop portion is a bearing fixedly provided in the seat body and sleeved on the outer periphery of the screw rod. The inner ring of the bearing has an end face facing the first stop portion;

[0017] Wherein, when the first stop portion is located at the first position, the first stop portion contacts the end face, and when the first stop portion is located at the second position, there is the target gap between the first stop portion and the end face.

[0018] According to some embodiments of the present application, it further includes:

[0019] A first elastic member connected between the stop seat assembly and the screw rod, so that the first stop portion has a tendency to move towards the first position.

[0020] According to some embodiments of the present application, a fifth stop portion is provided on the outer periphery of the screw rod. The fifth stop portion is located on the side of the second stop portion facing the first valve port and is spaced apart from the second stop portion;

[0021] The first elastic member is sleeved on the outer periphery of the screw rod, and one end of the first elastic member abuts against the second stop portion, and the other end abuts against the fifth stop portion.

[0022] According to some embodiments of the present application, it further includes:

[0023] A guide seat, the spool assembly and the guide seat are movably matched along the axial direction of the electronic expansion valve; the spool assembly and the guide seat are limitedly matched along the circumferential direction around the axial direction of the electronic expansion valve.

[0024] According to some embodiments of the present application, the spool assembly includes a nut screwed to the screw rod, and the nut has a main body and an anti-rotation protrusion connected to the outer periphery of the main body;

[0025] The guide seat includes a guide sleeve and a connecting ring connected to the outer periphery of the guide sleeve. The guide sleeve defines a guide hole, the main body is movably inserted into the guide hole, the guide sleeve further has a limiting hole penetrating through its inner wall surface and outer wall surface, and the anti-rotation protrusion is circumferentially limited in the limiting hole, and the connecting ring is fixedly connected to the valve body assembly.

[0026] According to some embodiments of the present application, the guide seat and the valve body assembly are in interference fit.

[0027] According to some embodiments of the present application, one end of the guide seat away from the first valve port extends into the stop seat assembly.

[0028] At least one of the above embodiments of the application has the following advantages or beneficial effects:

[0029] The electronic expansion valve of the embodiment of the present application includes a stop seat assembly, a screw rod and a spool assembly. The screw rod has a first stop portion, and the stop seat assembly has a second stop portion that abuts and cooperates with the first stop portion. When the first stop portion is in the second position relative to the second stop portion, the spool assembly closes the first valve port, and there is a target gap between the first stop portion and the second stop portion, and the pulse value corresponding to the target gap is the valve opening pulse point. Such a structural design enables the improvement of the fixed pulse accuracy by controlling factors such as the thread clearance tolerance between the rod body and the spool assembly and the measurement accuracy of the height measuring instrument during the fixed pulse process, thereby ensuring the consistency of the valve opening pulse point and improving the flow accuracy. Description of the Drawings

[0030] Figure 1 The figure shows a three-dimensional schematic diagram of the electronic expansion valve of the embodiment of the present application.

[0031] Figure 2 The figure shows a three-dimensional schematic diagram of the electronic expansion valve of the embodiment of the present application, in which the rotor assembly and the housing are omitted.

[0032] Figure 3 Shown is a top view schematic diagram of the electronic expansion valve according to an embodiment of the present application.

[0033] Figure 4 Shown is along Figure 3 The cross-sectional view obtained along the A-A cutting line in, where the first stop portion is located at the first position.

[0034] Figure 5 Shown is Figure 4 The partial enlarged view at X1 in.

[0035] Figure 6 Shown is Figure 4 The partial enlarged view at X1 in, where the first stop portion is located at the second position.

[0036] Figure 7 Shown is a schematic diagram of the relationship between the flow rate and the supply pulse number of the electronic expansion valve according to an embodiment of the present application.

[0037] Figure 8 Shown is an exploded schematic diagram of the nut and the guide seat.

[0038] Figure 9 Shown is an exploded schematic diagram of the valve core assembly.

[0039] Figure 10 Shown is a three-dimensional schematic diagram after the first valve core and the second valve core are assembled.

[0040] Figure 11 Shown is along Figure 10 The cross-sectional view obtained along the B-B cutting line in.

[0041] Among them, the reference numerals are explained as follows:

[0042] 100, valve body assembly; 101, inner cavity; 102, first valve port; 110, first valve body; 120, second valve body; 130, third valve body;

[0043] 200, valve core assembly; 210, nut; 211, main body; 212, anti-rotation projection; 220, connecting sleeve; 230, first valve core; 231, flange; 240, second valve core; 241, upper valve core; 2411, valve sleeve; 2412, spacer; 2413, through hole; 242, lower valve core; 2421, second valve port;

[0044] 300, stop seat assembly; 301, spiral guide groove; 302, third stop portion; 303, fourth stop portion; 310, second stop portion; 310a, bearing; 311, inner ring; 3111, end face; 312, outer ring; 320, seat body;

[0045] 400, Screw; 410, First stop portion; 420, Rod body; 430, Fifth stop portion;

[0046] 510, First elastic member; 520, Second elastic member;

[0047] 600, Stop ring; 610, First stop head; 620, Second stop head;

[0048] 700, Guide seat; 710, Guide sleeve; 711, Guide hole; 712, Limit hole; 720, Connecting ring; 810, Rotor assembly; 820, Outer shell. Detailed implementation manners

[0049] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote like or similar structures, and thus their detailed descriptions will be omitted.

[0050] It can be understood that the terms "including" and "having" and any variations thereof in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or components inherent to these processes, methods, products, or devices.

[0051] As Figures 1 to 6As shown in the figure, the electronic expansion valve according to the embodiment of the present application includes a valve body assembly 100, a valve core assembly 200, a screw rod 400, and a stop seat assembly 300. The valve body assembly 100 has an inner cavity 101, and the cavity wall of the inner cavity 101 has a first valve port 102; the valve core assembly 200 is movably located in the inner cavity 101 and is used to close or open the first valve port 102; the screw rod 400 includes a rod body 420 and a first stop portion 410, the rod body 420 is screwed to the valve core assembly 200 and is used to drive the valve core assembly 200 to move, and the first stop portion 410 is fixedly connected to the rod body 420; the stop seat assembly 300 is connected to the valve body assembly 100 and is sleeved on the outer periphery of the screw rod 400; the stop seat assembly 300 has a second stop portion 310 that is in stop cooperation with the first stop portion 410, and the second stop portion 310 is located on the side of the first stop portion 410 facing the first valve port 102; wherein, the first stop portion 410 is movable between a first position and a second position relative to the second stop portion 310. When the first stop portion 410 is in the first position, the first stop portion 410 is in contact with the second stop portion 310. When the first stop portion 410 is in the second position, the valve core assembly 200 closes the first valve port 102, and there is a target gap G between the first stop portion 410 and the second stop portion 310; when the first stop portion 410 moves from the second position to the first position, the supply pulse number of the electronic expansion valve is the valve opening pulse point.

[0052] In the fixed pulse process of the electronic expansion valve according to the embodiment of the present application, first, the operator vertically positions the electronic expansion valve on a tooling and defines a reference plane. For example, the reference plane can be the desktop of the operating table. Then, the screw rod 400 is moved in a direction away from the first valve port 102, so that the screw rod 400 drives the valve core assembly 200 to move together until the valve core assembly 200 opens the first valve port 102; then, the operator uses a height measuring instrument to record the distance between the top end of the screw rod 400 and the reference plane at this time, and defines this distance as the first height; then, the operator reversely rotates the screw rod 400, so that the screw rod 400 drives the valve core assembly 200 to move in a direction to close the first valve port 102. During the movement of the screw rod 400, the operator monitors in real time the distance between the top end of the screw rod 400 and the reference plane (this distance is defined as the second height), and stops rotating the screw rod 400 when the difference between the second height and the first height of the screw rod 400 at a certain moment is equal to the target gap G. Thus, the fixed pulse is completed.

[0053] As can be seen, the electronic expansion valve according to the embodiment of the present application includes a stop seat assembly 300, a screw 400, and a valve core assembly 200. The screw 400 has a first stop portion 410, and the stop seat assembly 300 has a second stop portion 310 that is in stop cooperation with the first stop portion 410. When the first stop portion 410 is in the second position relative to the second stop portion 310, the valve core assembly 200 closes the first valve port 102, and there is a target gap G between the first stop portion 410 and the second stop portion 310. When the first stop portion 410 moves from the second position to the first position, the supply pulse number of the electronic expansion valve is the valve opening pulse point. Such a structural design enables the improvement of the fixed pulse accuracy by controlling factors such as the thread clearance tolerance between the rod body 420 and the valve core assembly 200 and the measurement accuracy of the height measuring instrument during the fixed pulse process, thereby ensuring the consistency of the valve opening pulse point and improving the flow accuracy.

[0054] It should be noted that when the valve core assembly 200 closes the first valve port 102, the fluid flow rate through the first valve port 102 can be zero or a very small flow rate.

[0055] Combined with Figure 7 It can be seen that during the process of increasing the supply pulse number of the electronic expansion valve from the 0-pulse position to the valve opening pulse point, the electronic expansion valve switches from the closed state to the open state. Among them, during this process, the electronic expansion valve can switch from 0 flow rate to a preset flow rate value, or from a very small flow rate to a preset flow rate value.

[0056] As Figure 4 shown, the electronic expansion valve according to the embodiment of the present application further includes a rotor assembly 810 and a housing 820. The rotor assembly 810 is connected to the screw 400 and can drive the valve core assembly 200 to close or open the first valve port 102 through the screw 400. The housing 820 is connected to the valve body assembly 100 to enclose the rotor assembly 810 and part of the screw 400 within the housing 820.

[0057] As Figure 4 shown, the valve body assembly 100 may include a first valve body 110, a second valve body 120, and a third valve body 130. The first valve body 110, the second valve body 120, and the third valve body 130 are arranged along the axial direction of the screw 400. The second valve body 120 is connected between the first valve body 110 and the third valve body 130, and the first valve body 110, the second valve body 120, and the third valve body 130 jointly enclose an inner cavity 101.

[0058] It can be understood that the connection methods between the first valve body 110 and the second valve body 120, and between the second valve body 120 and the third valve body 130 can adopt welding, interference fit, etc., and the present application does not limit this.

[0059] Among them, the stop seat assembly 300 is fixedly connected to the first valve body 110, and the first valve port 102 is formed in the third valve body 130.

[0060] As Figure 2 shown, the stop seat assembly 300 further includes a seat body 320. The seat body 320 is sleeved on the outer periphery of the screw rod 400 and is fixedly connected to the first valve body 110 of the valve body assembly 100. The outer periphery of the seat body 320 has a spiral guide groove 301. A third stop portion 302 is provided at one end of the spiral guide groove 301 close to the first valve port 102, and a fourth stop portion 303 is provided at the end of the spiral guide groove 301 far from the first valve port 102.

[0061] The electronic expansion valve further includes a stop ring 600. The stop ring 600 is wound in the spiral guide groove 301 and has a first stop head 610 that is in stop cooperation with the third stop portion 302 and a second stop head 620 that is in stop cooperation with the fourth stop portion 303. When the first stop portion 410 is in the second position, the third stop portion 302 is in stop contact with the first stop head 610.

[0062] As Figure 4 and Figure 6 shown, the first stop portion 410 is annular and is fixedly sleeved on the outer periphery of the rod body 420. In one embodiment, the first stop portion 410 and the rod body 420 are of a split structure; in another embodiment, the first stop portion 410 can also be integrally connected to the rod body 420. When the first stop portion 410 and the rod body 420 are connected in a split manner, the connection method can be interference fit, but not limited thereto.

[0063] Continue to refer to Figure 4 and Figure 6 , the second stop portion 310 is a bearing 310a. The bearing 310a includes an inner ring 311 and an outer ring 312. The outer ring 312 is fixedly arranged in the seat body 320, and the inner ring 311 is sleeved on the outer periphery of the screw rod 400. The screw rod 400 can move relative to the bearing 310a so that the first stop portion 410 moves between the first position and the second position.

[0064] Along the axial direction of the screw rod 400, the inner ring 311 and the first stop portion 410 are oppositely arranged. The inner ring 311 has an end face 3111 facing the first stop portion 410. When the first stop portion 410 is in the first position, the first stop portion 410 is in contact with the end face 3111. When the first stop portion 410 is in the second position, there is a target gap G between the first stop portion 410 and the end face 3111.

[0065] As Figure 4 shown, the electronic expansion valve further includes a first elastic member 510. The first elastic member 510 is connected to the stop seat assembly 300 and the screw rod 400, so that the first stop portion 410 has a tendency to move to the first position.

[0066] The outer periphery of the screw 400 has a fifth stop portion 430. The fifth stop portion 430 is located on the side of the second stop portion 310 facing the first valve port 102 and is spaced from the second stop portion 310. The first elastic member 510 is sleeved on the outer periphery of the screw 400, and one end of the first elastic member 510 abuts against the second stop portion 310, and the other end abuts against the fifth stop portion 430. When the first stop portion 410 moves from the first position to the second position, the first elastic member 510 is compressed by the fifth stop portion 430 and the compression amount becomes larger, so that the first elastic member 510 can provide a pre-tightening force for closing the first valve port 102 to the valve core assembly 200 through the screw 400. Wherein, when the first stop portion 410 is in the first position, the first elastic member 510 has a first elastic force, and when the first stop portion 410 is in the second position, the first elastic member 510 has a second elastic force, and the first elastic force is less than the second elastic force.

[0067] In one embodiment, the first elastic member 510 may be a spring, but is not limited thereto.

[0068] As Figure 4 and Figure 8 shown, the electronic expansion valve according to the embodiment of the present application further includes a guide seat 700. The guide seat 700 is located in the inner cavity 101 and is fixedly connected to the valve body assembly 100 for guiding the valve core assembly 200 to move along the axial direction of the screw 400. The valve core assembly 200 is movably matched with the guide seat 700 along the axial direction of the electronic expansion valve, and the valve core assembly 200 is limitedly matched with the guide seat 400 along the circumferential direction around the axial direction of the electronic expansion valve.

[0069] The guide seat 700 includes a guide sleeve 710 and a connecting ring 720 connected to the outer periphery of the guide sleeve 710. The connecting ring 720 is fixedly connected to the valve body assembly 100. For example, the connecting ring 720 is in interference fit with the first valve body 110 of the valve body assembly 100.

[0070] The valve core assembly 200 includes a nut 210 screwed to the screw 400. The nut 210 has a main body 211 and an anti-rotation protrusion 212 connected to the outer periphery of the main body 211. The guide sleeve 710 defines a guide hole 711. The main body 211 of the nut 210 is movably inserted into the guide hole 711. The guide sleeve 710 further has a limiting hole 712 penetrating through its inner wall surface and outer wall surface. The anti-rotation protrusion 212 is circumferentially limited in the limiting hole 712 along the guide sleeve 710. Through the arrangement of the guide seat 700, the nut 210 can move along the axial direction of the screw 400 and cannot rotate circumferentially along the guide sleeve 710.

[0071] As Figure 4 shown, one end of the guide sleeve 710 of the guide seat 700 away from the first valve port 102 extends into the seat body 320 of the stop seat assembly 300. In this way, the overall height of the electronic expansion valve can be reduced.

[0072] As Figure 4 and Figure 9 shown, the valve core assembly 200 further includes a connecting sleeve 220, a first valve core 230 and a second valve core 240. One end of the connecting sleeve 220 is fixedly connected to the main body 211 of the nut 210, and the other end is fixedly connected to the first valve core 230. The first valve core 230 is used to drive the second valve core 240 to move along the axial direction of the screw rod 400, so that the second valve core 240 closes or opens the first valve port 102.

[0073] As Figure 10 and Figure 11 shown, the second valve core 240 includes an upper valve core 241 and a lower valve core 242, and the upper valve core 241 is fixedly connected to the lower valve core 242. The upper valve core 241 includes a valve sleeve 2411 and a spacer 2412. The spacer 2412 is integrally connected to the inner wall surface of the valve sleeve 2411, and the spacer 2412 has a through hole 2413. The first valve core 230 is movably disposed in the through hole 2413.

[0074] A flange 231 is provided on the outer periphery of the first valve core 230, and the flange 231 is located on the side of the spacer 2412 facing away from the nut 210. When the first valve core 230 moves upward, the flange 231 can abut against the spacer 2412, thereby driving the second valve core 240 to move upward.

[0075] The lower valve core 242 has a second valve port 2421 that can communicate with the first valve port 102, and the flow area of the second valve port 2421 is smaller than the flow area of the first valve port 102. The screw rod 400 can drive the nut 210 to move, and then the nut 210 can drive the first valve core 230 to move, so as to realize that the first valve core 230 closes or opens the second valve port 2421.

[0076] The electronic expansion valve further includes a second elastic member 520. One end of the second elastic member 520 abuts against the upper valve core 241, and the other end abuts against the guide seat 700. The second elastic member 520 is compressed so that the second valve core 240 has a tendency to move in a direction close to the first valve port 102.

[0077] In this way, the second valve core 240 is always subjected to the elastic force of the second elastic member 520, which can avoid affecting the centering of the second valve port 2421 and the first valve core 230 due to the shaking of the second valve core 240.

[0078] In one embodiment, the second elastic member 520 is a spring and is sleeved on the outer periphery of the nut 210, the connecting sleeve 220 and the first valve core 230. Wherein, at least a part of the second elastic member 520 is located inside the second valve core 240. When the second valve core 240 closes the first valve port 102, the second elastic member 520 can provide a pre-tightening force to ensure the sealing performance of the second valve core 240 closing the first valve port 102.

[0079] In summary, the electronic expansion valve according to the embodiment of the present application has at least the following advantages and beneficial effects:

[0080] The electronic expansion valve according to the embodiment of the present application includes a stop seat assembly 300, a screw 400, and a valve core assembly 200. The screw 400 has a first stop portion 410, and the stop seat assembly 300 has a second stop portion 310 that is in stop cooperation with the first stop portion 410. When the first stop portion 410 is located at a second position relative to the second stop portion 310, the valve core assembly 200 closes the first valve port 102, and there is a target gap G between the first stop portion 410 and the second stop portion 310. When the first stop portion 410 moves from the second position to the first position, the supply pulse number of the electronic expansion valve is the valve opening pulse point. Such a structural design enables the improvement of the fixed pulse accuracy by controlling factors such as the thread clearance tolerance between the rod body 420 and the valve core assembly 200 and the measurement accuracy of the height measuring instrument during the fixed pulse process, thereby ensuring the consistency of the valve opening pulse point and improving the flow accuracy.

[0081] When the valve core assembly 200 closes the first valve port 102, the flow rate can be greater than or equal to zero. From the lifted state of the valve core assembly 200 until the valve port is just closed, the height of the screw 400 remains unchanged throughout the process, and the first stop portion 410 is located at the second position. After the first valve port 102 is closed, the screw 400 continues to rotate, and the screw 400 rises to a set height, and the first stop portion 410 is located at the first position.

[0082] It can be understood that the various embodiments / implementation manners provided in the present application can be combined with each other without conflict, and no further examples will be given here.

[0083] In the embodiments of the application, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. Terms such as "installation", "connection", "connection", and "fixation" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the application can be understood according to specific situations.

[0084] In the description of the application embodiments, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the application embodiments and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the application embodiments.

[0085] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application embodiments. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0086] The above are only the preferred embodiments of the application embodiments and are not used to limit the application embodiments. For those skilled in the art, the application embodiments can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the application embodiments shall be included within the protection scope of the application embodiments.

Claims

1. An electronic expansion valve, characterized in that: include: The valve body assembly has an inner cavity, and the cavity wall of the inner cavity has a first valve port; a valve core assembly, movably located in the inner cavity, and used for closing or opening the first valve port; A screw rod, comprising a rod body and a first stopper, wherein the rod body is threadedly connected to the valve core assembly and is used to drive the valve core assembly to move, and the first stopper is fixedly connected to the rod body; and A stop seat assembly is connected to the valve body assembly and sleeved on the outer periphery of the screw; the stop seat assembly has a second stop portion that cooperates with the first stop portion, and the second stop portion is located on a side of the first stop portion facing the first valve port; Wherein, the first stop portion is movable between a first position and a second position relative to the second stop portion, and when the first stop portion is located at the first position, the first stop portion is in contact with the second stop portion; when the first stop portion is located at the second position, the valve core assembly closes the first valve port, and there is a target gap between the first stop portion and the second stop portion; when the first stop portion moves from the second position to the first position, the supply pulse number of the electronic expansion valve is the valve opening pulse point.

2. The electronic expansion valve according to claim 1, characterized in that: The outer periphery of the stop seat assembly is provided with a spiral guide groove, and one end of the spiral guide groove close to the first valve port is provided with a third stopper; The electronic expansion valve further comprises a stop ring, which is wound in the spiral guide groove and has a first stop head which cooperates with the third stop part; Wherein, when the first stop portion is located at the second position, the third stop portion contacts the first stop head.

3. The electronic expansion valve according to claim 1, characterized in that: The first stopper is annular and fixedly sleeved on the outer circumference of the rod body; or, the first stopper is annular and integrally arranged with the rod body.

4. The electronic expansion valve according to claim 1, characterized in that: The stop seat assembly also includes a seat body, which is sleeved on the outer periphery of the screw; The second stopper is a bearing, which is fixedly disposed in the seat body and sleeved on the outer circumference of the screw, and the inner ring of the bearing has an end surface facing the first stopper; When the first stopper is located at the first position, the first stopper is in contact with the end surface, and when the first stopper is located at the second position, there is the target gap between the first stopper and the end surface.

5. The electronic expansion valve according to claim 1, characterized in that: Also includes: The first elastic member is connected to the stop seat assembly and the screw rod, so that the first stop portion has a tendency to move toward the first position.

6. The electronic expansion valve according to claim 5, characterized in that: The outer periphery of the screw rod has a fifth stopper, the fifth stopper is located on a side of the second stopper facing the first valve port and is spaced apart from the second stopper; The first elastic member is sleeved on the outer circumference of the screw rod, and one end of the first elastic member abuts against the second stopper, and the other end of the first elastic member abuts against the fifth stopper.

7. The electronic expansion valve according to claim 1, characterized in that: Also includes: The guide seat is configured such that the valve core assembly and the guide seat are movably matched along the axial direction of the electronic expansion valve; the valve core assembly and the guide seat are limitedly matched along the circumferential direction around the axial direction of the electronic expansion valve.

8. The electronic expansion valve according to claim 7, characterized in that: The valve core assembly includes a nut threadedly connected to the screw rod, wherein the nut has a main body and a rotation-stopping protrusion connected to the outer periphery of the main body; The guide seat includes a guide sleeve and a connecting ring connected to the outer circumference of the guide sleeve, the guide sleeve forms a guide hole, the main body is movably inserted into the guide hole, the guide sleeve also has a limiting hole passing through its inner wall and outer wall, the anti-rotation protrusion is limited in the limiting hole along the circumference of the guide sleeve, and the connecting ring is fixedly connected to the valve body assembly.

9. The electronic expansion valve according to claim 7, characterized in that: The guide seat is interference fit with the valve body assembly.

10. The electronic expansion valve according to claim 7, characterized in that: One end of the guide seat away from the first valve port extends into the stop seat assembly.

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