Electronic expansion valve

Abstract

The application discloses an electronic expansion valve, which comprises a shell, a bearing support, a stopper and a driving assembly. The shell has a cavity. The bearing support is provided with a first anti-rotation groove, a first limiting piece and a second limiting piece. The first anti-rotation groove is arranged on the circumferential wall of the bearing support. The first limiting piece and the second limiting piece are respectively located at the two ends of the extension direction of the first anti-rotation groove. The stopper is arranged in the bearing support and is movable along the axial direction of the shell. The outer circumferential wall of the stopper is provided with a first anti-rotation lug. The first anti-rotation lug is located between the first limiting piece and the second limiting piece. The first limiting piece and the second limiting piece are both used for limiting the movement of the stopper along the axial direction of the shell. The driving assembly is arranged on the shell and comprises a screw rod. The screw rod is arranged in the stopper and is threadedly connected with the stopper. According to the electronic expansion valve, the axial height of the screw rod can be reduced, the height of the whole electronic expansion valve is reduced, the miniaturization of the electronic expansion valve is facilitated, and the cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of refrigerant control components, and in particular to an electronic expansion valve. Background Technology

[0002] With the rapid development of the automotive industry, automobiles are equipped with an increasing number of devices and functions, making valves, as the medium connecting multiple flow paths, increasingly important in the automobile manufacturing process. However, existing valves are large in height and size, making assembly inconvenient. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes an electronic expansion valve that can reduce the axial height of the screw, decrease the overall height of the electronic expansion valve, fully utilize the axial space of the electronic expansion valve, facilitate miniaturization of the electronic expansion valve, and reduce its cost.

[0004] An electronic expansion valve according to an embodiment of the present invention includes: a housing having a cavity; a bearing support disposed within the cavity and extending along the axial direction of the housing, the bearing support having a first anti-rotation groove, a first limiting member, and a second limiting member, the first anti-rotation groove being disposed on the peripheral wall of the bearing support and extending along the axial direction of the housing, the first limiting member and the second limiting member being respectively located at both ends of the extension direction of the first anti-rotation groove; and a stop member disposed within the bearing support and movable along the axial direction of the housing. The stop member has a first anti-rotation lug on its outer peripheral wall that mates with the first anti-rotation groove. The first anti-rotation lug is located between the first limiting member and the second limiting member. Both the first limiting member and the second limiting member are used to restrict the stop member from moving along the axial direction of the housing. The drive assembly is disposed on the housing and includes a screw. The screw extends along the axial direction of the housing and passes through the stop member and is threadedly connected to the stop member, for driving the stop member to move along the axial direction of the housing.

[0005] According to an embodiment of the present invention, the electronic expansion valve is provided with a first anti-rotation groove, a first limiting member and a second limiting member on the bearing support, and a first anti-rotation lug on the outer peripheral wall of the stop member that cooperates with the first anti-rotation groove. The first limiting member and the second limiting member restrict the movement of the stop member along the axial direction of the housing. The stop member can restrict the rotation of the screw by threading with the screw, thereby achieving the purpose of stopping. Thus, the axial height of the screw can be reduced by rotating multiple times with a small pitch. There is no need to leave space in the housing for the rotor component to move along the axial direction of the housing. This can reduce the overall height of the electronic expansion valve, make full use of the axial space of the electronic expansion valve, and facilitate the miniaturization of the electronic expansion valve and reduce the cost of the electronic expansion valve.

[0006] In addition, the electronic expansion valve according to the present invention may also have the following additional technical features:

[0007] In some embodiments, the stop member includes: a stop nut disposed within the bearing support and threadedly connected to the screw; and a stop ring sleeved on the stop nut, wherein the first anti-rotation lug is disposed on the outer peripheral wall of the stop ring, and the stop ring and the stop nut are rotatably or fixedly connected.

[0008] In some embodiments, the stop ring is rotatably connected to the stop nut, and the stop member further includes a stop bearing disposed between the stop nut and the stop ring.

[0009] In some embodiments, the stop nut has a rotation notch at one axial end.

[0010] In some embodiments, the stop is a single piece.

[0011] In some embodiments, the first anti-rotation lugs are a plurality of lugs spaced apart along the circumferential direction of the stop member, and the first anti-rotation grooves are a plurality of lugs corresponding one-to-one with the plurality of first anti-rotation lugs.

[0012] In some embodiments, the bearing support includes: a support body extending along the axial direction of the housing, a first anti-rotation groove disposed on the peripheral wall of the support body, and an end face of the first anti-rotation groove extending along the housing direction forming a first limiting member; and a stop limiting ring located within the support body and spaced apart from the first limiting member, the stop limiting ring having a through hole through which the screw passes, and the end face of the stop limiting ring facing the first limiting member forming a second limiting member.

[0013] In some embodiments, at least one end of the stop member along the axial direction of the housing is provided with a first elastic member, the first elastic member extends along the axial direction of the housing, and the end of the first elastic member opposite to the stop member abuts or connects with the first inner wall of the bearing support, the first elastic member being used to drive the stop member to move in a direction opposite to the first inner wall.

[0014] In some embodiments, the first elastic element is a spring, and the spring and the bearing support are separate components.

[0015] In some embodiments, the first elastic member and the bearing support are integral, the first elastic member is formed as a bent portion disposed on the first inner wall and extending toward the stop member, at least a portion of the bent portion has an angle with the axis of the bearing support, and one end of the bent portion away from the first inner wall is adapted to abut against the stop member.

[0016] In some embodiments, the bearing support is further provided with a clearance groove on its peripheral wall. The clearance groove extends along the axial direction of the housing and is disposed opposite to the bent portion. The clearance groove and the first anti-rotation groove are spaced apart in the circumferential direction of the bearing support. The outer peripheral wall of the stop member is further provided with a stop lug that cooperates with the clearance groove. The stop lug and the first anti-rotation lug are spaced apart in the circumferential direction of the stop member. The stop lug is adapted to abut against the bent portion.

[0017] In some embodiments, the electronic expansion valve further includes a drive bearing disposed between the screw and the bearing support.

[0018] In some embodiments, the housing includes a valve seat and a sleeve arranged and connected along the axial direction of the housing. The valve seat defines a first cavity, and the sleeve defines a second cavity. A portion of the bearing support, a portion of the drive assembly, and the stop are all located within the second cavity. The bearing support has a guide portion, a flange, and an exhaust groove at one end facing the first cavity. The guide portion is located within the valve seat and extends along the axial direction of the bearing support. The flange bends and extends radially outward from the bearing support and is connected to the end face of the valve seat near the sleeve. The inner bottom wall of the exhaust groove is located on the side of the flange away from the first cavity. In the circumferential direction of the bearing support, the exhaust groove is located between the guide portion and the flange, for communicating between the first cavity and the second cavity.

[0019] In some embodiments, the guide portions are a plurality of portions spaced apart along the circumferential direction of the bearing support, the flanges are a plurality of portions corresponding one-to-one with the plurality of guide portions, the plurality of flanges are staggered with the plurality of guide portions, and the exhaust groove is provided between any adjacent guide portions and flanges.

[0020] In some embodiments, the cavity includes a first cavity and a second cavity arranged in the axial direction of the cavity. The housing also has a communication hole and a valve port communicating with the first cavity. The communication hole is disposed on the peripheral wall of the housing. The valve port is disposed at one end of the first cavity opposite to the second cavity. A portion of the bearing support, a portion of the drive assembly, and the stop member are all located in the second cavity. The electronic expansion valve further includes a valve core disposed in the first cavity and threadedly connected to the screw. The valve core is movable along the axial direction of the housing to open or close the valve port.

[0021] In some embodiments, the inner wall of the first cavity has a second anti-rotation groove, which extends along the axial direction of the cavity. The valve core includes a valve core body and a drive nut. The valve core body has a third anti-rotation groove, which extends along the axial direction of the cavity. The drive nut is disposed in the valve core body and threadedly connected to the screw. The outer peripheral wall of the valve core body has a second anti-rotation lug that mates with the second anti-rotation groove. The outer peripheral wall of the drive nut has a third anti-rotation lug that mates with the third anti-rotation groove. Alternatively, the third anti-rotation groove is opposite to and communicates with the second anti-rotation groove. The outer peripheral wall of the drive nut has a second anti-rotation lug, which passes through both the third anti-rotation groove and the second anti-rotation groove.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0024] Figure 1 This is a front view of the electronic expansion valve according to the first embodiment of the present invention;

[0025] Figure 2 This is a cross-sectional view of an electronic expansion valve according to a first embodiment of the present invention;

[0026] Figure 3 This is a perspective view of an electronic expansion valve according to a first embodiment of the present invention, wherein the sleeve and part of the drive assembly are not shown;

[0027] Figure 4 This is a cross-sectional view of an electronic expansion valve according to a first embodiment of the present invention, wherein the sleeve and part of the drive assembly are not shown.

[0028] Figure 5This is a cross-sectional view of the electronic expansion valve according to the first embodiment of the present invention from another angle, wherein the sleeve and part of the drive assembly are not shown;

[0029] Figure 6 This is a perspective view of the bearing support and screw assembly of the electronic expansion valve according to the first embodiment of the present invention;

[0030] Figure 7 This is a cross-sectional view of the bearing support and screw of the electronic expansion valve according to the first embodiment of the present invention at an angle.

[0031] Figure 8 This is a cross-sectional view of the bearing support and screw of the electronic expansion valve according to the first embodiment of the present invention from another angle;

[0032] Figure 9 This is a perspective view of the stop member of the electronic expansion valve according to the first embodiment of the present invention;

[0033] Figure 10 This is a cross-sectional view of the stop member of the electronic expansion valve according to the first embodiment of the present invention;

[0034] Figure 11 This is a cross-sectional view of the electronic expansion valve according to a second embodiment of the present invention at one angle;

[0035] Figure 12 This is a cross-sectional view of the electronic expansion valve according to a second embodiment of the present invention from another angle;

[0036] Figure 13 This is a perspective view of the stop member, drive bearing, and screw assembly of the electronic expansion valve according to the second embodiment of the present invention;

[0037] Figure 14 This is a cross-sectional view of the electronic expansion valve according to a third embodiment of the present invention at one angle;

[0038] Figure 15 This is a cross-sectional view of the electronic expansion valve according to a third embodiment of the present invention from another angle;

[0039] Figure 16 This is a cross-sectional view of an electronic expansion valve according to a fourth embodiment of the present invention;

[0040] Figure 17 This is a cross-sectional view of an electronic expansion valve according to a fourth embodiment of the present invention, wherein the sleeve and part of the drive assembly are not shown.

[0041] Figure label:

[0042] 100. Electronic expansion valve;

[0043] 1. Shell; 10. Cavity; 101. First cavity; 1011. First sub-cavity; 1012. Second sub-cavity; 102. Second cavity; 103. Second anti-rotation groove; 11. Valve seat; 12. Sleeve; 13. Connecting hole; 14. Valve port;

[0044] 2. Bearing support; 21. Support body; 211. First anti-rotation groove; 212. First limiting member; 213. Clearance groove; 214. First section; 215. Second section; 216. Bending section; 22. Stop and limiting ring; 221. Through hole; 222. Second limiting member; 23. Third limiting member; 231. Limiting ring; 24. Fourth limiting member; 25. Guide part; 26. Flanged edge; 27. Exhaust groove;

[0045] 3. Stop component; 31. Stop nut; 311. Rotation notch; 32. Stop ring; 321. First anti-rotation lug; 33. Stop bearing; 34. First elastic element; 35. Anti-stop lug;

[0046] 4. Drive assembly; 41. Screw; 42. Rotor assembly; 43. Guide component;

[0047] 5. Drive bearing;

[0048] 6. Valve core; 60. Balance flow channel; 601. First flow channel; 602. Second flow channel; 61. Valve core body; 611. Third anti-rotation groove; 612. Body part; 613. Stop part; 62. Drive nut; 63. Second elastic element; 64. Second anti-rotation lug; 66. Balance sealing ring. Detailed Implementation

[0049] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0050] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0051] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0052] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0053] The electronic expansion valve 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0054] like Figure 2 As shown, the electronic expansion valve 100 according to an embodiment of the present invention includes a housing 1, a bearing support 2, a stop member 3, and a drive assembly 4.

[0055] Specifically, see the attached document. Figure 1 and attached Figure 2 As shown, the housing 1 protects the internal structure of the electronic expansion valve 100, which helps to extend the service life of the electronic expansion valve 100. The housing 1 has a cavity 10, and the bearing support 2 is disposed in the cavity 10 and along the axial direction of the housing 1 (see attached figure). Figure 2 Extending in the direction shown (a), the bearing support 2 has a first anti-rotation groove 211, a first limiting member 212, and a second limiting member 222. The first anti-rotation groove 211 is provided on the peripheral wall of the bearing support 2 and extends along the axial direction of the housing 1. The first limiting member 212 and the second limiting member 222 are respectively located in the extending direction of the first anti-rotation groove 211 (see attached diagram). Figure 2 The two ends of direction a shown.

[0056] Further, see attached document. Figure 2As shown, the stop member 3 is disposed within the bearing support 2 and is movable along the axial direction of the housing 1. The outer peripheral wall of the stop member 3 has a first anti-rotation lug 321 that mates with the first anti-rotation groove 211. The first anti-rotation lug 321 is located between the first limiting member 212 and the second limiting member 222. Both the first limiting member 212 and the second limiting member 222 are used to restrict the movement of the stop member 3 along the axial direction of the housing 1. The drive assembly 4 is disposed on the housing 1 and includes a screw 41. The screw 41 extends along the axial direction of the housing 1 and passes through the stop member 3 and is threadedly connected to the stop member 3, for driving the stop member 3 along the axial direction of the housing 1. During the axial movement of the stop 3 driven by the screw 41 along the axial direction of the housing 1, the first anti-rotation lug 321 and the first anti-rotation groove 211 cooperate to guide and position the stop 3, ensuring that the stop 3 moves only along the axial direction of the housing 1, preventing the stop 3 from rotating, preventing the stop 3 from getting stuck during rotation, and preventing the stop 3 from not moving along the axial direction of the housing 1 due to rotation, thereby preventing the electronic expansion valve 100 from failing, ensuring the reliability and stability of the electronic expansion valve 100, and extending the service life of the electronic expansion valve 100.

[0057] It should be noted that the reference appendix Figure 2 As shown, the drive assembly 4 also includes a coil component, a rotor component 42, and a guide member 43. The coil component is sleeved outside the housing 1, and the rotor component 42 is disposed inside the housing 1. The coil component and the rotor component 42 are arranged opposite to each other. The coil component is used to drive the rotor component 42 to rotate. The guide member 43 is fixed inside the rotor component 42, and the screw 41 passes through the guide member 43 along its length (see attached figure). Figure 2 One end of the rotor (in direction a) is welded to the guide 43, so that the rotor component 42, the guide 43 and the screw 41 rotate synchronously. The screw 41 passes through both the guide 43 and the stop 3. The guide 43 and the stop 3 are spaced apart along the axial direction of the housing 1, which can prevent the screw 41 from deviating during rotation and ensure the normal rotation of the screw 41.

[0058] It is understandable that, such as Figure 2 As shown, when the coil component is energized, the coil component drives the rotor component 42 to rotate. Since the screw 41 is fixedly connected to the rotor component 42 through the guide 43, the rotor component 42 drives the screw 41 to rotate together. Under the drive of the screw 41, the stop 3 moves along the axial direction of the housing 1 until the first anti-rotation lug 321 abuts against the first limiting member 212 or the second limiting member 222, restricting the stop 3 from continuing to move along the axial direction of the housing 1. Since the screw 41 is threadedly connected to the stop 3, the screw 41 cannot continue to rotate, thus achieving the purpose of stopping.

[0059] Understandably, in existing technologies, the valve core is often limited by the cooperation of slip rings and springs. The rotor component needs to move along the axial direction of the housing while rotating. However, in this invention, the first anti-rotation lug 321 abuts against the first limiting member 212 or the second limiting member 222, restricting the movement of the stop member 3 along the axial direction of the housing 1, thereby limiting the rotation of the screw 41 and achieving the limiting effect on the valve core 6. This means that the rotor component 42 does not need to move along the axial direction of the housing 1. Therefore, there is no need to leave space in the housing 1 for the rotor component 42 to move along the axial direction of the housing 1, reducing the amount of rotor magnetic powder and the axial length of the rotor component 42. This allows for a reduction in the overall height of the electronic expansion valve 100, making full use of the axial space of the electronic expansion valve 100, which is beneficial for the miniaturization of the electronic expansion valve 100 and reduces its cost.

[0060] Furthermore, since the stop 3 and the screw 41 are threadedly engaged, the axial height of the screw 41 can be reduced by rotating it multiple times with a small pitch. This effectively reduces the height caused by the cumulative effect of the wire diameter and pitch of the spring stop in the prior art, further reducing the height of the electronic expansion valve 100 and facilitating its miniaturization. At the same time, by eliminating the slip ring and spring design, the noise problem caused by the slip ring on the spring stop is solved, reducing the noise of the electronic expansion valve 100 during use and preventing the spring from breaking due to excessive force, thus relatively extending the service life of the electronic expansion valve 100.

[0061] Optionally, the threaded engagement between the stop 3 and the screw 41 is not limited to ordinary threads; it can also be a non-self-locking internal thread, trapezoidal thread, circular thread, or rectangular thread. The bearing support 2 can be a metal part or an injection-molded part; no further restrictions are imposed here.

[0062] According to an embodiment of the present invention, the electronic expansion valve 100 is provided with a first anti-rotation groove 211, a first limiting member 212 and a second limiting member 222 on the bearing support 2, and a first anti-rotation lug 321 on the outer peripheral wall of the stop member 3 that cooperates with the first anti-rotation groove 211. The first limiting member 212 and the second limiting member 222 restrict the movement of the stop member 3 along the axial direction of the housing 1. The stop member 3 can be threadedly connected to the screw 41 to restrict the rotation of the screw 41, thereby achieving the purpose of stopping. Thus, the axial height of the screw 41 can be reduced by rotating multiple times with a small pitch. There is no need to leave space in the housing 1 for the rotor component 42 to move along the axial direction of the housing 1. The overall height of the electronic expansion valve 100 can be reduced, and the axial space of the electronic expansion valve 100 can be fully utilized, which is conducive to the miniaturization of the electronic expansion valve 100 and reduces the cost of the electronic expansion valve 100.

[0063] In some embodiments of the present invention, reference is made to the appendix. Figure 6 Appendix Figure 7 and attached Figure 8As shown, the bearing support 2 includes a support body 21 and a stop and limiting ring 22. The support body 21 extends along the axial direction of the housing 1. A first anti-rotation groove 211 is provided on the peripheral wall of the support body 21. The first anti-rotation groove 211 extends along the direction of the housing 1 (see attached figure). Figure 2 One end face of the bearing support 212 is configured as a first limiting member 212. The stop limiting ring 22 is located inside the support body 21 and spaced apart from the first limiting member 212. The stop limiting ring 22 has a through hole 221, and the screw 41 passes through the through hole 221. The end face of the stop limiting ring 22 facing the first limiting member 212 is configured as a second limiting member 222. By making the support body 21 and the stop limiting ring 22 separate parts, the manufacturing and processing difficulty of the bearing support 2 can be reduced, and it is convenient to assemble the stop member 3 onto the bearing support 2, thereby reducing the assembly difficulty of the electronic expansion valve 100.

[0064] For example, such as Figure 6 Appendix Figure 7 and attached Figure 8 As shown, in conjunction with reference Figure 2 The first anti-rotation groove 211 is open at one end near the guide member 43, and the end of the first anti-rotation groove 211 away from the guide member 43 is configured as a first limiting member 212. A stop limiting ring 22 is provided at one end of the support body 21 near the guide member 43, and the end of the stop limiting ring 22 away from the guide member 43 is configured as a second limiting member 222; Figure 14 and attached Figure 15 As shown, the end of the first anti-rotation groove 211 away from the guide member 43 is open, the end of the first anti-rotation groove 211 near the guide member 43 is configured as the first limiting member 212, the stop limiting ring 22 is provided at the end of the support body 21 away from the guide member 43, and the end of the stop limiting ring 22 facing the guide member 43 is configured as the second limiting member 222.

[0065] It should be noted that the reference appendix Figure 3 Appendix Figure 4 and attached Figure 5 As shown, the stop and limit ring 22 has a through hole 221, through which the screw 41 passes. This allows the stop and limit ring 22 to radially limit the screw 41, preventing it from shifting during rotation and ensuring its normal rotation. This, in turn, prevents the rotor component 42 from shifting due to screw 41 shifting, thus avoiding friction between the rotor component 42 and the inner wall of the housing 1, and consequently preventing power loss. When assembling the bearing support 2, the stop and limit ring 22 and the support body 21 are first pressed together, and then welded together to increase the structural strength of the bearing support 2.

[0066] In some embodiments of the present invention, reference is made to the appendix. Figure 11 Appendix Figure 12 and attached Figure 10 As shown, the stop component 3 includes a stop nut 31 and a stop ring 32. The stop nut 31 is located inside the bearing support 2 and is threadedly connected to the screw 41. The stop ring 32 is sleeved on the stop nut 31. The first anti-rotation lug 321 is located on the outer peripheral wall of the stop ring 32. The stop ring 32 and the stop nut 31 are rotatably connected or fixedly connected, which can reduce the production difficulty of the stop nut 31 and the stop ring 32 and facilitate the production and processing of the stop component 3.

[0067] It is understandable that, such as Figure 2 and Figure 12 As shown, when the coil component is energized, the coil component drives the rotor component 42 to rotate. Since the screw 41 is fixedly connected to the rotor component 42 through the guide 43, the rotor component 42 drives the screw 41 to rotate together. Under the drive of the screw 41, the stop nut 31 moves along the axial direction of the housing 1. Since the stop nut 31 and the stop ring 32 are relatively fixed, the stop ring 32 and the stop nut 31 move together along the axial direction of the housing 1 until the first anti-rotation lug 321 abuts against the first limiting member 212 or the second limiting member 222, restricting the stop ring 32 from continuing to move along the axial direction of the housing 1. Since the screw 41 and the stop nut 31 are threadedly connected, the screw 41 cannot continue to rotate, thus achieving the purpose of stopping.

[0068] It should be noted that, as Figure 11 and Figure 13 As shown, the stop ring 32 is fixedly connected to the stop nut 31. When assembling the electronic expansion valve 100, first, the stop nut 31 is engaged with the screw 41, and the stop nut 31 is screwed into the support body 21. Then, the first anti-rotation lug 321 is aligned with the end of the first anti-rotation groove 211 that is away from the first limiting member 212. The stop ring 32 is moved toward the stop nut 31 until the first anti-rotation lug 321 abuts against the first limiting member 212. Then, the stop ring 32 and the stop nut 31 are fixedly connected. Finally, the stop limiting ring 22 is installed on the support body 21. Optionally, the stop ring 32 and the stop nut 31 can be connected by welding, riveting, snap-fitting, or interference fit.

[0069] In a further embodiment of the invention, reference is made to the appendix. Figure 9 and attached Figure 10 As shown, in conjunction with reference Figure 2The stop ring 32 is rotatably connected to the stop nut 31. The stop component 3 also includes a stop bearing 33, which is located between the stop nut 31 and the stop ring 32. The outer ring of the stop bearing 33 is fixed to the stop ring 32, and the inner ring is fixed to the stop nut 31 and rotates synchronously. The stop bearing 33 is configured to meet both the requirement of the first anti-rotation lug 321 on the stop ring 32 and the requirement of the threaded engagement between the stop nut 31 and the screw 41 when the stop component 3 is assembled onto the bearing support 2, thus ensuring that the stop ring 32 is only aligned along the axial direction of the bearing support 2 (see attached figure). Figure 2 The screw 41 moves in the direction shown (a), while the stop nut 31 moves along the axial direction of the screw 41 (see attached diagram). Figure 2 The movement in direction a) shown rotates relative to the screw 41, thereby realizing the assembly of the stop 3 with the bearing support 2 and the screw 41.

[0070] It should be noted that, as Figure 9 As shown, in conjunction with reference Figure 2 When assembling the electronic expansion valve 100, first assemble the stop nut 31, stop ring 32 and stop bearing 33 together to form a complete stop part 3. Then align the first anti-rotation lug 321 with the end of the first anti-rotation groove 211 that is away from the first limiting member 212, and move the entire stop part 3 toward the first limiting member 212 until the first anti-rotation lug 321 abuts against the first limiting member 212. Then install the stop limiting ring 22 on the support body 21. Finally, assemble the installed bearing support 2 and stop part 3 together onto the valve seat 11 and screw 41.

[0071] In a further embodiment of the invention, reference is made to the appendix. Figure 9 As shown, the stop nut 31 has a rotating notch 311 at one axial end. The rotating notch 311 can be multiple notches spaced apart along the circumferential direction of the stop nut 31. The rotating notch 311 makes it easier for the assembler to use tools to hold the stop nut 31 and screw it onto the screw 41, thereby reducing the assembly difficulty of the stop part 3 and improving the assembly efficiency of the electronic expansion valve 100.

[0072] In some embodiments of the present invention, reference is made to the appendix. Figure 14 and attached Figure 16 As shown, the stop component 3 is a single piece, resulting in low production costs. This reduces the number of parts in the electronic expansion valve 100, simplifies the assembly process, and improves assembly efficiency. It should be noted that, as... Figure 14As shown, when assembling the electronic expansion valve 100, the drive bearing 5, the stop limiting ring 22, and the screw 41 are first assembled onto the valve seat 11. Then, the stop 3 is threaded onto the screw 41, so that the stop 3 moves toward the second limiting member 222 until the first anti-rotation lug 321 abuts against the second limiting member 222. Finally, the support body 21 is assembled onto the stop limiting ring 22. After confirming that the first anti-rotation groove 211 and the first anti-rotation lug 321 are aligned, the support body 21 and the stop limiting ring 22 are welded and fixed.

[0073] In some embodiments of the present invention, reference is made to the appendix. Figure 9 As shown, the first anti-rotation lugs 321 are multiple ones spaced apart along the circumferential direction of the stop member 3, and the first anti-rotation grooves 211 are multiple ones corresponding one-to-one with the multiple first anti-rotation lugs 321. They can limit the stop member 3 from multiple points spaced apart in the circumferential direction, preventing the stop member 3 from rotating relative to the bearing support 2, ensuring that the stop member 3 can move along the axial direction of the housing 1, thereby preventing the electronic expansion valve 100 from failing, ensuring the reliability and stability of the electronic expansion valve 100, and extending the service life of the electronic expansion valve 100. For example, the first anti-rotation lugs 321 can be two, three, four, five, or six spaced apart along the circumferential direction of the stop member 3, and the first anti-rotation grooves 211 can be two, three, four, five, or six corresponding one-to-one with the multiple first anti-rotation lugs 321.

[0074] In a specific example, see Appendix Figure 2 and attached Figure 9 As shown, the first anti-rotation lugs 321 are two spaced apart along the circumferential direction of the stop member 3. The two first anti-rotation lugs 321 are located on opposite sides of the stop member 3. The first anti-rotation grooves 211 are two corresponding to the two first anti-rotation lugs 321. They can limit the stop member 3 from two spaced apart along the circumferential direction, further preventing the stop member 3 from rotating relative to the bearing support 2, ensuring that the stop member 3 can move along the axial direction of the housing 1, preventing the electronic expansion valve 100 from failing, ensuring the reliability and stability of the electronic expansion valve 100, and extending the service life of the electronic expansion valve 100.

[0075] In some embodiments of the present invention, reference is made to the appendix. Figure 14 and attached Figure 16 As shown, at least one end of the stop member 3 along the axial direction of the housing 1 is provided with a first elastic member 34. The first elastic member 34 extends along the axial direction of the housing 1. The end of the first elastic member 34 away from the stop member 3 abuts or connects with the first inner wall of the bearing support 2. The first elastic member 34 is used to drive the stop member 3 to move in the direction away from the first inner wall.

[0076] Understandably, since the valve core 6 is set with an opening stroke, when the set number of pulses is greater than the stop stroke, when the first anti-rotation lug 321 abuts against the first limit member 212 or the second limit member 222, the rotor component 42 will still drive the screw 41 to rotate and apply torque to the stop member 3, causing the stop member 3 to lock with the screw 41, resulting in excessive locking force. This makes it impossible for the rotor component 42 to loosen the stop member 3 from the screw 41 when the screw 41 rotates in the opposite direction, causing the electronic expansion valve 100 to be stuck. By providing a first elastic element 34 at at least one end of the stop member 3 along the axial direction of the housing 1, the preload of the first elastic element 34 is less than the axial force provided by the rotor component 42. When the first anti-rotation lug 321 abuts against the first limiting member 212 or the second limiting member 222, the first anti-rotation lug 321 compresses the first elastic element 34. As the first elastic element 34 is compressed, the preload of the first elastic element 34 increases, but it is still less than the axial force provided by the rotor component 42. This can reduce the locking force between the stop member 3 and the screw 41. When the screw 41 rotates in the opposite direction, it is beneficial for the stop member 3 to loosen, preventing the stop member 3 from jamming, thereby ensuring the normal use of the electronic expansion valve 100 and extending the service life of the electronic expansion valve 100.

[0077] It is understandable that at least one end of the stop member 3 along the axial direction of the housing 1 is provided with a first elastic element 34. This can be because only the end of the stop member 3 facing the stop limiting ring 22 is provided with a first elastic element 34, and the end of the stop member 3 away from the stop limiting ring 22 is not provided with a first elastic element 34; or only the end of the stop member 3 away from the stop limiting ring 22 is provided with a first elastic element 34, and the end of the stop member 3 facing the stop limiting ring 22 is not provided with a first elastic element 34; or both ends of the stop member 3 along the axial direction of the housing 1 are provided with a first elastic element 34.

[0078] In a further embodiment of the invention, reference is made to the appendix. Figure 14 and attached Figure 15 As shown, the first elastic element 34 is a spring, and the spring and bearing support 2 are separate components. The spring's length direction (see attached diagram) Figure 15 The two ends of the (direction a) shown abut against the first inner wall of the stop 3 and the bearing support 2, respectively, which can reduce the manufacturing difficulty of the first elastic element 34 and the bearing support 2, and facilitate the production and processing of the bearing support 2. In a specific example, refer to the attached figure. Figure 14 and attached Figure 15As shown, the first anti-rotation groove 211 has one end away from the guide member 43 open, the stop limiting ring 22 is located at the end of the support body 21 away from the guide member 43, the stop member 3 has a spring at the end facing the guide member 43, the end of the spring facing the guide member 43 abuts against the first inner wall, and the end of the spring away from the guide member 43 abuts against the stop member 3. The spring is only provided at one end of the stop member 3 along the axial direction of the housing 1, which can relatively reduce the production cost of the electronic expansion valve 100.

[0079] In a further embodiment of the invention, reference is made to the appendix. Figure 16 and attached Figure 17 As shown, the first elastic member 34 and the bearing support 2 are integral parts. The first elastic member 34 is formed as a bent portion provided on the first inner wall and extending toward the stop member 3. At least a portion of the bent portion has an angle with the axis of the bearing support 2. The end of the bent portion away from the first inner wall is adapted to abut against the stop member 3 to drive the stop member 3 to move in the direction away from the first inner wall. By making the first elastic member 34 and the bearing support 2 integral parts, the production cost of the electronic expansion valve 100 can be reduced, the number of parts of the electronic expansion valve 100 can be reduced, the assembly process of the electronic expansion valve 100 can be simplified, and the assembly efficiency of the electronic expansion valve 100 can be improved.

[0080] Of course, the present invention is not limited to this. The first inner wall can be the inner wall of one side of the bearing support 2 along the axial direction of the housing 1. The first inner wall can also be the peripheral wall of the bearing support 2. When the first inner wall is the peripheral wall of the bearing support 2, the bent part is provided on the peripheral wall of the bearing support 2. The bent part extends generally along the axial direction of the housing 1 and has an angle with at least part of the axis of the bearing support 2. One end of the bent part away from the guide member 43 is adapted to abut against the stop member 3 to drive the stop member 3 to move in the direction away from the guide member 43.

[0081] In a further embodiment of the invention, reference is made to the appendix. Figure 16 and attached Figure 17 As shown, the bearing support 2 also has a relief groove 213 on its peripheral wall. The relief groove 213 extends along the axial direction of the housing 1 and is positioned opposite to the bent portion. The relief groove 213 and the first anti-rotation groove 211 are spaced apart in the circumferential direction of the bearing support 2. The outer peripheral wall of the stop member 3 also has a stop lug 35 that mates with the relief groove 213. The stop lug 35 and the first anti-rotation lug 321 are spaced apart in the circumferential direction of the stop member 3. The stop lug 35 is adapted to abut against the bent portion. It can be understood that the stop lug 35 is located within the relief groove 213 and extends along the extending direction of the relief groove 213 (see attached figure). Figure 16The stop (in the direction shown in a) is movable. Through the cooperation of the stop lug 35 and the relief groove 213, it can play a limiting role on the one hand to prevent the stop 3 from rotating relative to the bearing. On the other hand, it can reduce the locking force between the stop 3 and the screw 41, which is conducive to the loosening of the stop 3 and avoids the stop 3 from jamming. This ensures the normal use of the electronic expansion valve 100, prevents the electronic expansion valve 100 from failing, ensures the reliability and stability of the electronic expansion valve 100, and extends the service life of the electronic expansion valve 100.

[0082] Further, see attached document. Figure 16 and attached Figure 17 As shown, the abutment lugs 35 are multiple spaced apart along the circumferential direction of the stop member 3, and the clearance grooves 213 are multiple corresponding to the multiple abutment lugs 35. On the one hand, this can further reduce the locking force between the stop member 3 and the screw 41, and facilitate the loosening of the stop member 3 when the screw 41 rotates in the opposite direction, preventing the stop member 3 from jamming and ensuring the normal use of the electronic expansion valve 100. On the other hand, it can limit the stop member 3 from multiple spaced apart along the circumferential direction, preventing the stop member 3 from rotating relative to the bearing support 2, ensuring that the stop member 3 can move along the axial direction of the housing 1, thereby preventing the electronic expansion valve 100 from failing, ensuring the reliability and stability of the electronic expansion valve 100, and extending the service life of the electronic expansion valve 100. For example, there can be two, three, four, five, or six abutment lugs 35 spaced apart along the circumferential direction of the stop member 3, and there can be two, three, four, five, or six clearance grooves 213 corresponding to the multiple abutment lugs 35.

[0083] In a specific example, see Appendix Figure 16 and attached Figure 17 As shown, there are two first anti-rotation lugs 321 and two stop lugs 35. Two first anti-rotation grooves 211 correspond one-to-one with the two first anti-rotation lugs 321, and two clearance grooves 213 correspond one-to-one with the two stop lugs 35. The first anti-rotation lugs 321 and the stop lugs 35 are staggered and evenly spaced in the circumferential direction of the stop member 3. The two first anti-rotation lugs 321 are located on opposite sides of the stop member 3, and the two stop lugs 35 are located on opposite sides of the stop member 3. Through the cooperation of the first anti-rotation lug 321 and the first anti-rotation groove 211, and the cooperation of the stop lug 35 and the clearance groove 213, the stop member 3 can be limited from four spaced apart in the circumferential direction, further preventing the stop member 3 from rotating relative to the bearing support 2, ensuring that the stop member 3 can move in the axial direction of the housing 1, preventing the electronic expansion valve 100 from failing, ensuring the reliability and stability of the electronic expansion valve 100, and extending the service life of the electronic expansion valve 100.

[0084] In some embodiments of the present invention, reference is made to the appendix. Figure 7 and attached Figure 8As shown, the electronic expansion valve 100 also includes a drive bearing 5, which is located between the screw 41 and the bearing support 2. The outer ring of the drive bearing 5 is fixed to the bearing support 2, and the inner ring is fixed to the screw 41 and rotates synchronously. The drive bearing 5 ensures the normal rotation of the screw 41 and also fixes the screw 41, further preventing the screw 41 from shifting during rotation.

[0085] It should be noted that the bearing support 2 is a stamped part. Through the cooperation of the drive bearing 5 and the bearing support 2, it can replace the nut structure in the prior art. While ensuring the guiding and positioning effects on the screw 41 and the stop 3, it eliminates the need to tap threads on the bearing support 2, reducing the precision requirements of the bearing support 2 and lowering the manufacturing cost of the electronic expansion valve 100. Furthermore, since the nut structure in the prior art is an injection-molded PEEK (polyetheretherketone) or copper part, and is driven by threads, it is prone to friction and chipping, affecting product operation. The present invention avoids the problem of friction and chipping, ensuring the normal use of the electronic expansion valve 100 and extending its service life.

[0086] In a further embodiment of the invention, reference is made to the appendix. Figure 7 and attached Figure 8 As shown, the bearing support 2 also has a third limiting member 23 and a fourth limiting member 24. Both the third limiting member 23 and the fourth limiting member 24 are located on the side of the first limiting member 212 away from the stop member 3. The third limiting member 23 restricts the drive bearing 5 from moving away from the stop member 3, and the fourth limiting member 24 restricts the drive bearing 5 from moving closer to the stop member 3. The third limiting member 23 and the fourth limiting member 24 can respectively move from the axial direction of the drive bearing 5 (see attached diagram). Figure 8 The two sides of the drive bearing 5 (in the direction shown in a) limit the drive bearing 5 and jointly position the drive bearing 5 to prevent the drive bearing 5 from moving along the axial direction of the housing 1, thus ensuring the fit between the drive bearing 5 and the screw 41 and ensuring the normal rotation of the screw 41.

[0087] In a specific example, see Appendix Figure 7 and attached Figure 8 As shown, the bearing support 2 also includes a retaining ring 231, which is located at the end of the support body 21 away from the guide member 43. The end face of the retaining ring 231 facing the guide member 43 is configured as a third retaining member 23. The support body 21 includes a first section 214, a second section 215, and a bent section 216. The first section 214 and the second section 215 are along the axial direction of the bearing support 2 (see attached diagram). Figure 8As shown in direction a), the second segment 215 has a larger diameter than the first segment 214. Along the axial direction of the bearing support 2, the bent segment 216 is located between the first segment 214 and the second segment 215. The bent segment 216 extends along the radial direction of the bearing support 2. The inner radial end of the bent segment 216 is connected to the first segment 214, and the outer radial end of the bent segment 216 is connected to the second segment 215. The side end face of the bent segment 216 away from the guide member 43 is constructed as the fourth limiting member 24. When assembling the drive bearing 5 onto the bearing support 2, first insert the drive bearing 5 along the direction from the second section 215 to the first section 214 until the drive bearing 5 abuts against the side end face of the bent section 216 away from the guide member 43. Then, insert the limiting ring 231 into the second section 215 and make an interference fit with the second section 215 so that the side end face of the limiting ring 231 facing the guide member 43 abuts against the drive bearing 5. Finally, weld the limiting ring 231 to the support body 21 to complete the assembly of the drive bearing 5.

[0088] In some embodiments of the present invention, reference is made to the appendix. Figure 2 As shown, the housing 1 includes a valve seat 11 and a sleeve 12 arranged and connected along the axial direction of the housing 1. The valve seat 11 defines a first cavity 101, and the sleeve 12 defines a second cavity 102. A portion of the bearing support 2, a portion of the drive assembly 4, and the stop member 3 are all located within the second cavity 102. The end of the bearing support 2 facing the first cavity 101 has a guide portion 25, a flange 26, and an exhaust groove 27. The guide portion 25 is located within the valve seat 11 and extends along the axial direction of the bearing support 2. The flange 26 bends and extends radially outward toward the bearing support 2. Furthermore, the flange 26 is connected to the end face of the valve seat 11 near the sleeve 12, and the inner bottom wall of the exhaust groove 27 is located on the side of the flange 26 away from the first cavity 101. In the circumferential direction of the bearing support 2, the exhaust groove 27 is located between the guide part 25 and the flange 26, which is used to connect the first cavity 101 and the second cavity 102, so that the air pressure in the second cavity 102 is consistent with the air pressure in the first cavity 101, ensuring that the valve core 6 is always in a pressure balance state during the switching process, and avoiding affecting the normal movement of the valve core 6 along the axial direction of the housing 1.

[0089] It is understandable that when assembling the bearing support 2 onto the housing 1, the guide part 25 is first inserted into the valve seat 11 from the end of the valve seat 11 facing the sleeve 12. When the flange 26 abuts against the end of the valve seat 11 facing the sleeve 12, the flange 26 is fixedly connected to the valve seat 11. Thus, the setting of the guide part 25 can play a guiding role, which is conducive to the centering of the bearing support 2 and the entire electronic expansion valve 100 when assembling the bearing support 2 onto the valve seat 11, and facilitates the assembly of the bearing support 2. The setting of the flange 26 can play a fixing role, which facilitates the connection between the bearing support 2 and the valve seat 11 and improves the reliability of the electronic expansion valve 100.

[0090] It should be noted that the flange 26 is welded to the end face of the valve seat 11 facing the sleeve 12. The connection strength is high and it can withstand a large force, ensuring the reliability of the connection between the flange 26 and the valve seat 11 and improving the stability of the bearing support 2.

[0091] In a further embodiment of the invention, reference is made to the appendix. Figure 6 As shown, there are multiple guide sections 25 spaced apart along the circumferential direction of the bearing support 2, and multiple flanges 26 corresponding one-to-one with the multiple guide sections 25. The multiple flanges 26 and the multiple guide sections 25 are staggered. An exhaust groove 27 is provided between any adjacent guide section 25 and flange 26. The arrangement of multiple guide sections 25 can improve the guiding effect of the guide sections 25 on the bearing support 2, facilitate the alignment of the bearing support 2, and facilitate the assembly of the bearing support 2. The arrangement of multiple flanges 26 can strengthen the connection between the bearing support 2 and the valve seat 11, and improve the reliability of the electronic expansion valve 100. The arrangement of multiple exhaust grooves 27 can increase the communication path between the first cavity 101 and the second cavity 102, ensure the pressure balance inside the electronic expansion valve 100, and ensure the normal movement of the valve core 6 along the axial direction of the housing 1.

[0092] In a specific example, see Appendix Figure 6 As shown, there are three guide sections 25 spaced apart along the circumferential direction of the bearing support 2, and three flanges 26 corresponding to the three guide sections 25. The three flanges 26 and the three guide sections 25 are staggered, and an exhaust groove 27 is provided between any adjacent guide sections 25 and flanges 26.

[0093] In some embodiments of the present invention, reference is made to the appendix. Figure 2 As shown, cavity 10 includes a cavity 10 in the axial direction (see attached diagram). Figure 2 The first cavity 101 and the second cavity 102 are arranged in the direction shown (a). The housing 1 also has a connecting hole 13 and a valve port 14 communicating with the first cavity 101. The connecting hole 13 is located on the peripheral wall of the housing 1. The valve port 14 is located at the end of the first cavity 101 away from the second cavity 102. The bearing support 2, the drive assembly 4, and the stop 3 are all located in the second cavity 102. The electronic expansion valve 100 also includes a valve core 6. The valve core 6 is located in the first cavity 101 and is threadedly connected to the screw 41. The valve core 6 is located on the side of the stop 3 facing the valve port 14. The valve core 6 is movable along the axial direction of the housing 1 to open or close the valve port 14.

[0094] Under the drive of the drive assembly 4, the screw 41 drives the valve core 6 to move along the axial direction of the housing 1. When the valve core 6 opens the valve port 14, the medium can flow into the cavity 10 from one of the valve port 14 and the connecting hole 13, and then flow from the cavity 10 to the other of the valve port 14 and the connecting hole 13. When the valve core 6 closes the valve port 14, the medium in the cavity 10 cannot flow out from the valve port 14, and the medium outside the electronic expansion valve 100 cannot flow into the cavity 10 from the valve port 14. By opening or closing the valve port 14, different user needs can be met and the user experience can be improved.

[0095] Further, see Appendix Figure 2 As shown, the valve core 6 has a balanced flow channel 60 extending along the axial direction of the cavity 10. Both ends of the balanced flow channel 60 are open along the axial direction of the cavity 10. Since there is a balanced sealing ring 66 between the outer peripheral wall of the valve core 6 and the inner peripheral wall of the first cavity 101, the balanced sealing ring 66 can divide the first cavity 101 into a first sub-cavity 1011 and a second sub-cavity 1012. The first sub-cavity 1011 and the second sub-cavity 1012 are arranged along the axial direction of the housing 1. The second sub-cavity 1012 and the second cavity 102 are always connected through the exhaust groove 27. The first sub-cavity 1011 is located on the side of the second sub-cavity 1012 away from the second cavity 102. The valve port 14 and the connecting hole 13 are both connected to the first sub-cavity 1011.

[0096] Understandably, the medium enters the balance flow channel 60 from the end facing the valve port 14, flows along the balance flow channel 60 to the second sub-cavity 1012, and then flows into the second cavity 102 through the exhaust groove 27. This ensures that the air pressure in the second cavity 102, the air pressure in the second sub-cavity 1012, and the air pressure on the side of the valve core 6 away from the second cavity 102 are consistent, guaranteeing that the valve core 6 is always in a pressure balance state during switching, and avoiding affecting the normal movement of the valve core 6 along the axial direction of the housing 1. For example, the medium can be refrigerant.

[0097] In a further embodiment of the invention, reference is made to the appendix. Figure 2As shown, the inner wall of the first cavity 101 has a second anti-rotation groove 103, which extends along the axial direction of the cavity 10. The valve core 6 includes a valve core body 61 and a drive nut 62. The valve core body 61 defines a balance flow channel 60. The valve core body 61 has a third anti-rotation groove 611, which extends along the axial direction of the cavity 10 and communicates with the balance flow channel 60. The drive nut 62 is located inside the valve core body 61 and is threadedly connected to the screw 41. When the coil component is energized, the coil component drives the rotor component 42 to rotate. Since the screw 41 is fixedly connected to the rotor component 42 through the guide 43, the rotor component 42 drives the screw 41 to rotate together. Under the drive of the screw 41, the drive nut 62 moves along the axial direction of the housing 1, thereby opening or closing the valve port 14 of the valve core 6.

[0098] It is understandable that the medium entering the balance flow channel 60 from the end facing the valve port 14 can flow into the second sub-cavity 1012 through the third anti-rotation groove 611, and then flow into the second cavity 102 through the exhaust groove 27. This ensures that the air pressure in the second cavity 102, the air pressure in the second sub-cavity 1012 and the air pressure on the side of the valve core 6 away from the second cavity 102 are consistent, ensuring that the valve core 6 is always in a pressure balance state during the switching process, and avoiding affecting the normal movement of the valve core 6 along the axial direction of the housing 1.

[0099] Further, see Appendix Figure 11 As shown, the outer peripheral wall of the valve core body 61 has a second anti-rotation lug 64 that mates with the second anti-rotation groove 103, and the outer peripheral wall of the drive nut 62 has a third anti-rotation lug that mates with the third anti-rotation groove 611. By the engagement of the second anti-rotation lug 64 with the second anti-rotation groove 103 and the third anti-rotation lug with the third anti-rotation groove 611, the valve core body 61 can be prevented from rotating relative to the housing 1, and the drive nut 62 can be prevented from rotating relative to the valve core body 61. This ensures that the valve core body 61 can only move along the axial direction of the housing 1 and cannot rotate, and that the drive nut 62 can only move along the axial direction of the housing 1 and cannot rotate. This ensures that the entire valve core 6 will not rotate, thereby preventing the valve core 6 from jamming during rotation and avoiding the valve core 6 from not moving along the axial direction of the housing 1 due to rotation. This prevents the electronic expansion valve 100 from failing, ensures the reliability and stability of the electronic expansion valve 100, and extends the service life of the electronic expansion valve 100.

[0100] Further, see Appendix Figure 11As shown, the second anti-rotation lugs 64 are multiple spaced apart along the circumferential direction of the valve core body 61, the second anti-rotation grooves 103 are multiple corresponding to the multiple second anti-rotation lugs 64, the third anti-rotation lugs are multiple spaced apart along the circumferential direction of the drive nut 62, and the third anti-rotation grooves 611 are multiple corresponding to the multiple third anti-rotation lugs. Through multiple limiting points between the valve core body 61 and the housing 1, and between the drive nut 62 and the valve core body 61, the valve core 6 can be limited from multiple spaced apart along the circumferential direction, preventing the valve core 6 from rotating relative to the housing 1, ensuring that the valve core 6 can move along the circumferential direction of the housing 1, thereby preventing the electronic expansion valve 100 from failing, ensuring the reliability and stability of the electronic expansion valve 100, and extending the service life of the electronic expansion valve 100. For example, the second anti-rotation lug 64 can be two, three, four, five or six spaced apart along the circumferential direction of the valve core body 61, the second anti-rotation groove 103 can be two, three, four, five or six corresponding to the multiple second anti-rotation lugs 64, the third anti-rotation lug can be two, three, four, five or six spaced apart along the circumferential direction of the drive nut 62, and the third anti-rotation groove 611 can be two, three, four, five or six corresponding to the multiple third anti-rotation lugs.

[0101] In a specific example, the second anti-rotation lugs 64 are two spaced apart along the circumferential direction of the valve core body 61, and the two second anti-rotation lugs 64 are located on opposite sides of the valve core body 61. The second anti-rotation grooves 103 are two corresponding to the two second anti-rotation lugs 64. The third anti-rotation lugs are two spaced apart along the circumferential direction of the drive nut 62, and the third anti-rotation grooves 611 are two corresponding to the two third anti-rotation lugs. These can limit the valve core 6 from two spaced apart along the circumferential direction of the valve core 6, further preventing the valve core 6 from rotating relative to the housing 1, ensuring that the valve core 6 can move along the axial direction of the housing 1, preventing the electronic expansion valve 100 from failing, ensuring the reliability and stability of the electronic expansion valve 100, and extending the service life of the electronic expansion valve 100.

[0102] Alternatively, refer to the appendix. Figure 14As shown, the third anti-rotation groove 611 is opposite to and connected to the second anti-rotation groove 103. The outer peripheral wall of the drive nut 62 has a second anti-rotation lug 64. The second anti-rotation lug 64 passes through both the third anti-rotation groove 611 and the second anti-rotation groove 103. By cooperating with both the second anti-rotation groove 103 and the third anti-rotation groove 611, the second anti-rotation lug 64 can simultaneously prevent the valve core body 61 from rotating relative to the housing 1 and prevent the drive nut 62 from rotating relative to the valve core body 61. This ensures that there is no relative rotation between the drive nut 62, the valve core body 61, and the valve seat 11, thereby preventing the valve core 6 from getting stuck during rotation. This avoids the valve core 6 from not moving along the axial direction of the housing 1 due to rotation, thus preventing the electronic expansion valve 100 from failing, ensuring the reliability and stability of the electronic expansion valve 100, and extending the service life of the electronic expansion valve 100.

[0103] Further, see Appendix Figure 15 As shown, the second anti-rotation lugs 64 are multiple spaced apart in the circumferential direction of the drive nut 62. The second anti-rotation grooves 103 and 611 are multiple corresponding to the multiple second anti-rotation lugs 64. They can limit the valve core 6 from multiple spaced apart in the circumferential direction of the valve core 6, preventing the valve core 6 from rotating relative to the housing 1, ensuring that the valve core 6 can move in the circumferential direction of the housing 1, thereby preventing the electronic expansion valve 100 from failing, ensuring the reliability and stability of the electronic expansion valve 100, and extending the service life of the electronic expansion valve 100. For example, the second anti-rotation lugs 64 can be two, three, four, five, or six spaced apart in the circumferential direction of the drive nut 62, the second anti-rotation grooves 103 can be two, three, four, five, or six corresponding to the multiple second anti-rotation lugs 64, and the third anti-rotation grooves 611 can be two, three, four, five, or six corresponding to the multiple second anti-rotation lugs 64.

[0104] In a specific example, there are two second anti-rotation lugs 64 spaced apart along the circumferential direction of the drive nut 62. The two second anti-rotation lugs 64 are located on opposite sides of the drive nut 62. The second anti-rotation groove 103 and the third anti-rotation groove 611 are two corresponding to the two second anti-rotation lugs 64. They can limit the valve core 6 from two spaced apart along the circumferential direction, further preventing the valve core 6 from rotating relative to the housing 1, ensuring that the valve core 6 can move along the axial direction of the housing 1, preventing the electronic expansion valve 100 from failing, ensuring the reliability and stability of the electronic expansion valve 100, and extending the service life of the electronic expansion valve 100.

[0105] It should be noted that when the second anti-rotation lug 64 is located on the outer peripheral wall of the valve core body 61, and the outer peripheral wall of the drive nut 62 has a third anti-rotation lug that mates with the third anti-rotation groove 611, the second anti-rotation lug 64 and the third anti-rotation lug can mate with the second anti-rotation groove 103 and the third anti-rotation groove 611 respectively. This can relatively reduce the difficulty of aligning the second anti-rotation lug 64 with the second anti-rotation groove 103 and the third anti-rotation lug with the third anti-rotation groove 611, thereby reducing the assembly difficulty of the drive nut 62, the valve core body 61, and the valve seat 11. The assembly difficulty of the electronic expansion valve 100 is reduced. When the second anti-rotation lug 64 is provided on the outer peripheral wall of the drive nut 62, and the third anti-rotation groove 611 is opposite to and connected to the second anti-rotation groove 103, and the second anti-rotation lug 64 is simultaneously inserted into the third anti-rotation groove 611 and the second anti-rotation groove 103, it is only necessary to process the second anti-rotation lug 64 on the drive nut 62, without processing the anti-rotation lug on the outer peripheral wall of the valve core body 61. This can relatively reduce the production difficulty of the valve core 6 and reduce the production and processing difficulty of the electronic expansion valve 100.

[0106] It should be noted that, by providing a screw 41 in the axial direction (see attached diagram) Figure 2 The two threaded sections (as shown in direction a) are spaced apart and respectively engage with the stop nut 31 and the drive nut 62. By providing the stop bearing 33 and the drive bearing 5 spaced apart in the axial direction of the housing 1, the rotor component 42 can be stably controlled to rotate at the same height, ensuring effective transmission between the stator component and the rotor component 42, reducing the axial movement of the rotor component 42, reducing the length of the rotor component 42 in the axial direction of the housing 1, and reducing the cost of the electronic expansion valve 100.

[0107] Furthermore, the pitches of the two threads on the screw 41 can be different to meet different needs and achieve their respective functions. For example, when the stroke of the valve core 6 in the axial direction of the housing 1 is short, the thread on the screw 41 that mates with the stop nut 31 can be set to a large thread pitch to achieve the purpose of stopping. When the stroke of the valve core 6 in the axial direction of the housing 1 is long, in order to ensure the accuracy of the flow adjustment of the valve core 6 at the valve port 14, the thread on the screw 41 that mates with the drive nut 62 needs to be set to a small thread pitch. The thread on the screw 41 that mates with the stop nut 31 can be set to a small thread pitch, so that even if the stop nut 31 rotates many times, the axial displacement is still very small. When the stroke of the valve core 6 in the axial direction of the housing 1 is long, the accuracy of the flow adjustment of the valve core 6 at the valve port 14 is very high, and the opening and closing time requirement is very short, the thread on the screw 41 that mates with the drive nut 62 can use a double-start thread or a multi-start thread. This can increase the lead while keeping the pitch fine, thereby improving the flow adjustment accuracy and speeding up the valve opening time. The thread on the screw 41 that mates with the stop nut 31 can be adapted to the thread pitch according to the stroke.

[0108] In yet another embodiment of the invention, reference is made to the appendix. Figure 2 As shown, in the direction from the second cavity 102 to the first cavity 101, the balance flow channel 60 includes a first flow channel 601 and a second flow channel 602 arranged sequentially and connected. The inner diameter of the first flow channel 601 is smaller than the inner diameter of the second flow channel 602. The drive nut 62 is located inside the second flow channel 602. The valve core 6 also includes a second elastic element 63, which is disposed inside the second flow channel 602. The extension direction of the second elastic element 63 is (see attached diagram). Figure 2 One end of the drive nut 62 (in the direction shown in a) abuts against the end of the drive nut 62 facing the valve port 14, and the other end abuts against the inner bottom wall of the second flow channel 602 facing the first flow channel 601. The second elastic member 63 is in a compressed state and is used to push the drive nut 62 to move in a direction away from the valve port 14.

[0109] It should be noted that the reference appendix Figure 2 As shown, the valve core body 61 includes a body portion 612 and a stop portion 613. The body portion 612 extends along the axial direction of the housing 1 and defines a first flow channel 601 and a second flow channel 602. A third anti-rotation groove 611 is provided on the peripheral wall of the body portion 612. The stop portion 613 is provided at one end of the body portion 612 away from the valve port 14 and is fixedly connected to the body portion 612. The screw 41 passes through the stop portion 613. The stop portion 613 is adapted to abut against one end of the drive nut 62 away from the valve port 14 to restrict the drive nut 62 from moving in the direction away from the valve port 14.

[0110] In a specific example, see Appendix Figure 11 As shown, the second anti-rotation lug 64 is provided on the outer peripheral wall of the stop portion 613 and is used to cooperate with the second anti-rotation groove 103 of the valve seat 11. The outer peripheral wall of the drive nut 62 has a third anti-rotation lug that only cooperates with the third anti-rotation groove 611. At this time, the stop portion 613 is used to limit the drive nut 62 in the axial direction of the housing 1 and to prevent the valve core 6 from rotating relative to the valve seat 11. In another specific example, refer to the attached drawing. Figure 14 As shown, the second anti-rotation lug 64 is provided on the outer peripheral wall of the drive nut 62. The second anti-rotation lug 64 is simultaneously inserted into the third anti-rotation groove 611 and the second anti-rotation groove 103. At this time, the stop part 613 is only used to limit the drive nut 62 in the axial direction of the housing 1.

[0111] Understandably, see attached document. Figure 2As shown, during the process of the valve core 6 closing the valve port 14, the screw 41 rotates, causing the drive nut 62 to move towards the valve port 14. Since the second elastic element 63 is relatively hard, it will not be compressed at this time. This allows the valve core body 61, the second elastic element 63, and the drive nut 62 to move together as a whole towards the valve port 14 until the valve core body 61 blocks the valve port 14. The valve core body 61 can no longer move, but under the drive of the drive assembly 4, the screw 41 continues to rotate, causing the drive nut 62 to continue moving towards the valve port 14, compressing the second elastic element 63, generating a preload force, and reserving a set valve opening pulse. This ensures that the electronic expansion valve 100 has sufficient sealing force to block the valve port 14 when the power is off or when it is not running, thus preventing media leakage.

[0112] During the process of the valve core 6 opening the valve port 14, the second elastic element 63 needs to be restored first, and run a period of idle stroke until the second elastic element 63 drives the drive nut 62 to abut against the end face of the stop part 613 facing the valve port 14. Only then can the valve core body 61 be driven to move together in the direction away from the valve port 14, thereby ensuring the reliability and stability of the seal on the valve port 14, reducing the failure risk of the electronic expansion valve 100, and extending the service life of the electronic expansion valve 100.

[0113] Other configurations and operations of the electronic expansion valve 100 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0114] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0115] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An electronic expansion valve, characterized in that, include: A housing (1) having a cavity (10); A bearing support (2) is disposed in the cavity (10) and extends along the axial direction of the housing (1). The bearing support (2) has a first anti-rotation groove (211), a first limiting member (212), and a second limiting member (222). The first anti-rotation groove (211) is disposed on the peripheral wall of the bearing support (2) and extends along the axial direction of the housing (1). The first limiting member (212) and the second limiting member (222) are respectively located at both ends of the extension direction of the first anti-rotation groove (211). A stop (3) is provided in the bearing support (2) and is movable in the axial direction of the housing (1). The outer peripheral wall of the stop (3) has a first anti-rotation lug (321) that cooperates with the first anti-rotation groove (211). The first anti-rotation lug (321) is located between the first limiting member (212) and the second limiting member (222). The first limiting member (212) and the second limiting member (222) are both used to restrict the stop (3) from moving in the axial direction of the housing (1). A drive assembly (4) is disposed on the housing (1) and includes a screw (41). The screw (41) extends along the axial direction of the housing (1). The screw (41) passes through the stop member (3) and is threadedly connected to the stop member (3) for driving the stop member (3) to move along the axial direction of the housing (1).

2. The electronic expansion valve according to claim 1, characterized in that, The stop member (3) includes: Stop nut (31), the stop nut (31) is provided in the bearing support (2), and the stop nut (31) is threadedly connected to the screw (41); A stop ring (32) is sleeved on the stop nut (31). The first anti-rotation lug (321) is provided on the outer peripheral wall of the stop ring (32). The stop ring (32) and the stop nut (31) are rotatably connected or fixedly connected.

3. The electronic expansion valve according to claim 2, characterized in that, The stop ring (32) is rotatably connected to the stop nut (31), and the stop member (3) further includes: A stop bearing (33) is disposed between the stop nut (31) and the stop ring (32).

4. The electronic expansion valve according to claim 2, characterized in that, The stop nut (31) has a rotation notch (311) at one axial end.

5. The electronic expansion valve according to claim 1, characterized in that, The stop (3) is a single piece.

6. The electronic expansion valve according to claim 1, characterized in that, The first anti-rotation lug (321) is a plurality of lugs spaced apart along the circumferential direction of the stop (3), and the first anti-rotation groove (211) is a plurality of lugs corresponding one-to-one with the plurality of the first anti-rotation lugs (321).

7. The electronic expansion valve according to claim 1, characterized in that, The bearing support (2) includes: Support body (21), the support body (21) extends along the axial direction of the housing (1), the first anti-rotation groove (211) is provided on the peripheral wall of the support body (21), and one end face of the first anti-rotation groove (211) along the extension direction of the housing (1) is configured as the first limiting member (212). A stop and limit ring (22) is located inside the support body (21) and spaced apart from the first limit member (212). The stop and limit ring (22) has a through hole (221), and the screw (41) passes through the through hole (221). The end face of the stop and limit ring (22) facing the first limit member (212) is configured as the second limit member (222).

8. The electronic expansion valve according to claim 1, characterized in that, The stop member (3) has a first elastic member (34) at at least one end along the axial direction of the housing (1). The first elastic member (34) extends along the axial direction of the housing (1). The end of the first elastic member (34) away from the stop member (3) abuts or connects to the first inner wall of the bearing support (2). The first elastic member (34) is used to drive the stop member (3) to move in a direction away from the first inner wall.

9. The electronic expansion valve according to claim 8, characterized in that, The first elastic element (34) is a spring, and the spring and the bearing support (2) are separate parts.

10. The electronic expansion valve according to claim 8, characterized in that, The first elastic member (34) and the bearing support (2) are integral parts. The first elastic member (34) is formed as a bent portion provided on the first inner wall and extending toward the stop member (3). At least a portion of the bent portion has an angle with the axis of the bearing support (2). One end of the bent portion away from the first inner wall is adapted to abut against the stop member (3).

11. The electronic expansion valve according to claim 10, characterized in that, The bearing support (2) is also provided with a relief groove (213) on its peripheral wall. The relief groove (213) extends along the axial direction of the housing (1) and is disposed opposite to the bent portion. The relief groove (213) and the first anti-rotation groove (211) are spaced apart in the circumferential direction of the bearing support (2). The outer peripheral wall of the stop member (3) is also provided with a stop lug (35) that cooperates with the relief groove (213). The stop lug (35) and the first anti-rotation lug (321) are spaced apart in the circumferential direction of the stop member (3). The stop lug (35) is adapted to abut against the bent portion.

12. The electronic expansion valve according to claim 1, characterized in that, Also includes: A drive bearing (5) is disposed between the screw (41) and the bearing support (2).

13. The electronic expansion valve according to claim 1, characterized in that, The housing (1) includes a valve seat (11) and a sleeve (12) arranged and connected along the axial direction of the housing (1). The valve seat (11) defines a first cavity (101), and the sleeve (12) defines a second cavity (102). A portion of the bearing support (2), a portion of the drive assembly (4), and the stop (3) are all located within the second cavity (102). The bearing support (2) has a guide portion (25), a flange (26), and an exhaust groove (27) at one end facing the first cavity (101). The guide portion (25) is located on the valve seat (11). The flange (26) extends radially outward from the bearing support (2) and is connected to the end face of the valve seat (11) near the sleeve (12). The inner bottom wall of the exhaust groove (27) is located on the side of the flange (26) away from the first cavity (101). In the circumferential direction of the bearing support (2), the exhaust groove (27) is located between the guide (25) and the flange (26) to connect the first cavity (101) and the second cavity (102).

14. The electronic expansion valve according to claim 13, characterized in that, The guide portion (25) is a plurality of portions spaced apart along the circumferential direction of the bearing support (2). The flange (26) is a plurality of portions corresponding one-to-one with the plurality of guide portions (25). The plurality of flanges (26) are staggered with the plurality of guide portions (25). The exhaust groove (27) is provided between any adjacent guide portion (25) and flange (26).

15. The electronic expansion valve according to claim 1, characterized in that, The cavity (10) includes a first cavity (101) and a second cavity (102) arranged in the axial direction of the cavity (10). The housing (1) also has a connecting hole (13) and a valve port (14) communicating with the first cavity (101). The connecting hole (13) is provided on the peripheral wall of the housing (1). The valve port (14) is provided at one end of the first cavity (101) away from the second cavity (102). Part of the bearing support (2), part of the drive assembly (4) and the stop member (3) are all located in the second cavity (102). The electronic expansion valve (100) further includes: The valve core (6) is located in the first cavity (101) and is threadedly connected to the screw (41). The valve core (6) is movable along the axial direction of the housing (1) to open or close the valve port (14).

16. The electronic expansion valve according to claim 15, characterized in that, The inner wall of the first cavity (101) has a second anti-rotation groove (103), which extends along the axial direction of the cavity (10). The valve core (6) includes a valve core body (61) and a drive nut (62). The valve core body (61) has a third anti-rotation groove (611), which extends along the axial direction of the cavity (10). The drive nut (62) is located inside the valve core body (61) and is threadedly connected to the screw (41). The outer peripheral wall of the valve core body (61) has a second anti-rotation lug (64) that cooperates with the second anti-rotation groove (103), and the outer peripheral wall of the drive nut (62) has a third anti-rotation lug that cooperates with the third anti-rotation groove (611); Alternatively, the third anti-rotation groove (611) is opposite to and connected to the second anti-rotation groove (103), and the outer peripheral wall of the drive nut (62) has a second anti-rotation lug (64), which is simultaneously inserted into the third anti-rotation groove (611) and the second anti-rotation groove (103).

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