Electronic expansion valve

Abstract

The utility model discloses an electronic expansion valve which comprises a shell, a valve element, a valve element, a valve element, a valve element, a valve element, a valve element, a valve element, a valve element and a valve element. The shell is provided with a cavity, a communicating hole and a valve opening, the driving assembly comprises a screw rod; the valve element is arranged in the cavity, can move in the axial direction of the shell and is used for opening or closing the valve port; the nut assembly is arranged in the cavity and used for driving the valve element to move in the axial direction of the shell, the nut assembly comprises a first nut, a second nut and a first elastic piece, the screw rod is sleeved with the first nut and the second nut, the first nut and the second nut are arranged in the extending direction of the screw rod in a spaced mode, and the first nut and the second nut can move in the extending direction of the screw rod; the first elastic piece is used for driving the first nut and the second nut to move in the direction away from each other. According to the electronic expansion valve, the movement amount of the first nut and the second nut matched with the screw can be eliminated, the stability of movement of the valve element is improved, the flow precision is improved, and the flow delay in the valve opening and closing process is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a refrigerant control element technical field especially relates to an electronic expansion valve. BACKGROUND

[0002] With the rapid development of the automobile industry, the equipment and functions on the car are more and more, and the valve as the medium of connecting multiple flow paths is more and more important in the production and manufacturing process of the car. The existing vehicle-mounted heat pump efficiency requirement is higher and higher, the power consumption demand is lower and lower, and the system has higher and higher demand for the adjustment accuracy of refrigerant. The traditional electronic expansion valve cannot meet the user's demand in the aspect of flow control accuracy. SUMMARY

[0003] The utility model discloses at least solve one of the technical problems in the prior art. To this end, the utility model provides an electronic expansion valve, the electronic expansion valve can eliminate the first nut and the second nut and the screw rod cooperation and move, improve the stability of the valve core movement, improve the flow accuracy, reduce the flow hysteresis in the on-off valve process.

[0004] The electronic expansion valve according to the utility model embodiment comprises a shell, the shell has a cavity, a communication hole and a valve port communicated with the cavity, the communication hole is arranged on the peripheral wall of the shell, and the valve port is arranged at one end of the axial direction of the cavity;A driving assembly is arranged on the shell and comprises a screw rod, the screw rod is arranged in the cavity and extends along the axial direction of the shell;A valve core is arranged in the cavity and is movable along the axial direction of the shell, and is used for opening or closing the valve port;A nut assembly is arranged in the cavity and is used for driving the valve core to move along the axial direction of the shell, the nut assembly comprises a first nut, a second nut and a first elastic piece, the first nut and the second nut are both sleeved on the screw rod and are arranged at intervals along the extension direction of the screw rod, the first nut and the second nut are movable along the extension direction of the screw rod, and the first elastic piece is arranged between the first nut and the second nut and is used for driving the first nut and the second nut to move towards the direction away from each other.

[0005] The electronic expansion valve according to the embodiment of the utility model, through being equipped with nut assembly in cavity, be used for driving spool to move along the axial direction of shell, nut assembly includes first nut, second nut and first elastic piece, first nut and second nut are all set on screw rod and are arranged along the extension direction of screw rod, first nut and second nut are all with screw rod thread cooperation, the rotation of screw rod can drive first nut and second nut to move along the extension direction of screw rod simultaneously, guarantee first nut and second nut distance along screw rod extension direction is always invariable, first elastic piece is equipped between first nut and second nut, the pre-tightening force of first elastic piece keeps invariable, be used for driving first nut and second nut to move towards the direction of deviating from each other, so that the screw thread of first nut always contacts with the side surface of screw thread of screw rod towards valve port, the screw thread of second nut always contacts with the side surface of screw thread of screw rod deviating from valve port, guarantee first nut and second nut and the one side of screw thread of screw rod are pasted effectively, can reduce the axial gap of first nut and second nut and screw rod cooperation in the process that electronic expansion valve opens valve or closes valve, eliminate the amount of movement of first nut and second nut and screw rod cooperation, improve the stability of spool movement, improve the stability of electronic expansion valve flow, improve the flow accuracy of electronic expansion valve, reduce the flow hysteresis of electronic expansion valve in the process that opens valve or closes valve, satisfy the use demand of user.

[0006] In addition, the electronic expansion valve according to the utility model can also have the following additional technical features.

[0007] In some embodiments, the electronic expansion valve further comprises a bearing support, the bearing support is arranged in the cavity, part of the spool, the nut assembly and part of the screw rod are located in the bearing support, the bearing support has a second anti-rotation groove, the second anti-rotation groove extends along the axial direction of the shell, the outer peripheral wall of the first nut is provided with a second anti-rotation lug, the outer peripheral wall of the second nut is provided with a third anti-rotation lug, the second anti-rotation lug and the third anti-rotation lug cooperate with the second anti-rotation groove, and the second anti-rotation lug and the third anti-rotation lug are movable along the extension direction of the second anti-rotation groove.

[0008] In some embodiments, the second anti-rotation groove is a plurality of grooves spaced apart along the circumferential direction of the bearing support, and the second anti-rotation lug and the third anti-rotation lug are a plurality of lugs corresponding to the plurality of second anti-rotation grooves.

[0009] In some embodiments, the nut assembly is arranged in the valve core, the screw rod extends into the valve core to cooperate with the nut assembly, the valve core has a third anti-rotation groove, the third anti-rotation groove is arranged on the peripheral wall of the valve core and extends in the axial direction of the valve core, the third anti-rotation groove is arranged opposite to the second anti-rotation groove, and the second anti-rotation lug and the third anti-rotation lug are arranged in the second anti-rotation groove and the third anti-rotation groove at the same time.

[0010] In some embodiments, the valve core further has a fifth limiting piece and a sixth limiting piece, the fifth limiting piece and the sixth limiting piece are respectively located at two ends of the extending direction of the third anti-rotation groove, the second anti-rotation lug and the third anti-rotation lug are located between the fifth limiting piece and the sixth limiting piece, the fifth limiting piece is used to limit the movement of the nut assembly in the direction away from the valve port, and the sixth limiting piece is used to limit the movement of the nut assembly in the direction close to the valve port.

[0011] In some embodiments, the valve core comprises: a body portion extending in the axial direction of the valve core, the third anti-rotation groove is arranged on the peripheral wall of the body portion, and the end face of the third anti-rotation groove close to the valve port is configured as the sixth limiting piece; an abutting portion arranged at one end of the body portion away from the valve port and fixedly connected with the body portion, the screw rod is arranged in the abutting portion, the abutting portion is spaced apart from the sixth limiting piece, and the end face of the abutting portion toward the sixth limiting piece is configured as the fifth limiting piece.

[0012] In some embodiments, the electronic expansion valve further comprises a driving bearing, and the driving bearing is arranged between the screw rod and the bearing support.

[0013] In some embodiments, the bearing support further has a third limiting piece and a fourth limiting piece, the third limiting piece and the fourth limiting piece are both located on the side of the valve core away from the valve port, the third limiting piece is used to limit the movement of the driving bearing in the direction close to the valve port, and the fourth limiting piece is used to limit the movement of the driving bearing in the direction away from the valve port.

[0014] In some embodiments, the bearing support comprises a support body and a limiting post, the support body extends along the axial direction of the housing, the second anti-rotation groove is arranged on the peripheral wall of the support body, the limiting post and the support body are arranged and connected along the axial direction of the housing, the limiting post is located in the support body, the end face of the limiting post facing the valve port is configured as the fourth limiting member, the inner peripheral wall of the support body has a limiting protrusion, the limiting protrusion is spaced apart from the limiting post, and the end face of the limiting protrusion facing the limiting post is configured as the third limiting member; or, the limiting post is sleeved outside the support body, the inner peripheral wall of the support body has a first protrusion and a second protrusion, the first protrusion and the second protrusion are spaced apart in the axial direction of the support body, and the end faces of the first protrusion and the second protrusion facing each other are respectively configured as the third limiting member and the fourth limiting member.

[0015] In some embodiments, the bearing support further has a first anti-rotation groove, a first limiting member and a second limiting member, the first anti-rotation groove is arranged on the peripheral wall of the bearing support and extends along the axial direction of the housing, the first anti-rotation groove is located on the side of the second anti-rotation groove away from the valve port, and the first limiting member and the second limiting member are respectively located at the two ends of the extension direction of the first anti-rotation groove, the electronic expansion valve further comprises a stop member, the stop member is arranged in the bearing support, the screw rod is sleeved in the stop member and is threadedly connected with the stop member, the stop member is used for driving the stop member to move along the axial direction of the housing, the outer peripheral wall of the stop member has a first anti-rotation lug matched with the first anti-rotation groove, the first anti-rotation lug is located between the first limiting member and the second limiting member, and the first limiting member and the second limiting member are respectively used for limiting the movement of the stop member along the axial direction of the housing.

[0016] In some embodiments, the first anti-rotation lug is a plurality of anti-rotation lugs spaced apart along the circumferential direction of the stop member, and the first anti-rotation groove is a plurality of anti-rotation grooves corresponding to the plurality of first anti-rotation lugs.

[0017] In some embodiments, the cavity comprises a first cavity and a second cavity arranged along the axial direction of the cavity, the communication hole and the valve port are both in communication with the first cavity, the valve port is arranged at one end of the first cavity away from the second cavity, the valve core and the nut assembly are both located in the first cavity, and part of the drive assembly is located in the second cavity, the valve core has a balance flow channel extending along the axial direction of the cavity, and both ends of the balance flow channel along the axial direction of the cavity are open.

[0018] In some embodiments, the balance flow channel comprises a first flow channel and a second flow channel arranged in sequence and communicated in the direction from the second cavity to the first cavity, an inner diameter of the first flow channel is smaller than an inner diameter of the second flow channel, the nut assembly is located in the second flow channel, a second elastic member is arranged in the second flow channel, one end of an extension direction of the second elastic member abuts against one end of the nut assembly facing the valve port, and the other end of the extension direction of the second elastic member abuts against an inner bottom wall of the second flow channel facing the first flow channel, and the second elastic member is in a compressed state.

[0019] Additional aspects and advantages of the present application will be set forth in part in the following description, and in part will become apparent to those skilled in the art upon examination of the following description, or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, taken in conjunction with the following drawings, in which:

[0021] Figure 1 is a front view of an electronic expansion valve according to an embodiment of the present application;

[0022] Figure 2 is a cross-sectional view of an electronic expansion valve according to an embodiment of the present application;

[0023] Figure 3 is a perspective view of a partial housing, a screw rod, a stopper, and a bearing support cooperation of an electronic expansion valve according to an embodiment of the present application;

[0024] Figure 4 is a perspective view of a support body of a bearing support of an electronic expansion valve according to an embodiment of the present application;

[0025] Figure 5 is a perspective view of a valve core and a nut assembly cooperation of an electronic expansion valve according to an embodiment of the present application;

[0026] Figure 6 is a cross-sectional view of a valve core and a nut assembly cooperation of an electronic expansion valve according to an embodiment of the present application from one angle;

[0027] Figure 7 is a cross-sectional view of a valve core and a nut assembly cooperation of an electronic expansion valve according to an embodiment of the present application from another angle;

[0028] Figure 8 is a cross-sectional view of a valve core, a nut assembly, a bearing support, a screw rod, and a partial housing of an electronic expansion valve according to an embodiment of the present application.

[0029] REFERENCE NUMERALS:

[0030] 100, electronic expansion valve;

[0031] 1, housing; 10, cavity; 101, first cavity; 1011, first sub-cavity; 1012, second sub-cavity; 102, second cavity; 11, communication hole; 12, valve port;

[0032] 2, bearing support; 21, support body; 211, limiting protrusion; 22, limiting column; 23, third limiting piece; 24, fourth limiting piece; 25, second anti-rotation groove; 26, first anti-rotation groove; 27, first limiting piece; 28, second limiting piece; 29, notch;

[0033] 3, stop; 31, first anti-rotation lug;

[0034] 4, drive assembly; 41, screw rod; 42, rotor component; 43, guide;

[0035] 5, drive bearing;

[0036] 6, valve core; 60, balance flow channel; 601, first flow channel; 602, second flow channel; 61, body part; 62, abutting part; 63, third anti-rotation groove; 64, fifth limiting piece; 65, sixth limiting piece; 66, second elastic piece; 67, balance sealing ring;

[0037] 7, nut assembly; 71, first nut; 711, second anti-rotation lug; 72, second nut; 721, third anti-rotation lug; 73, first elastic piece. DETAILED DESCRIPTION

[0038] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0039] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0040] In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are only used for descriptive purpose and cannot be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined as "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more than two, unless otherwise specifically limited.

[0041] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected, or it can be communicated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] The electronic expansion valve 100 according to the embodiments of the present application will be described below with reference to the accompanying drawings.

[0043] As shown in Figure 2 , the electronic expansion valve 100 according to the embodiments of the present application comprises a housing 1, a drive assembly 4, a valve core 6 and a nut assembly 7.

[0044] Specifically, referring to the accompanying Figure 1 and Figure 2 , the housing 1 can protect the internal structure of the electronic expansion valve 100, which is beneficial to prolong the service life of the electronic expansion valve 100. The housing 1 has a cavity 10, a communication hole 11 and a valve port 12 which communicate with the cavity 10. The communication hole 11 is arranged on the peripheral wall of the housing 1, and the valve port 12 is arranged at one end of the cavity 10 in the axial direction. The drive assembly 4 is arranged on the housing 1 and comprises a screw rod 41. The screw rod 41 is arranged in the cavity 10 and extends in the axial direction of the housing 1 (refer to the a direction shown in the accompanying Figure 2 , the valve core 6 is arranged in the cavity 10 and is movable in the axial direction of the housing 1, which is used to open or close the valve port 12.

[0045] Further, referring to the accompanying Figure 2 and the accompanying Figure 8 , the nut assembly 7 is arranged in the cavity 10 and is used to drive the valve core 6 to move in the axial direction of the housing 1. The nut assembly 7 comprises a first nut 71, a second nut 72 and a first elastic member 73. The first nut 71 and the second nut 72 are both sleeved on the screw rod 41 and extend in the axial direction of the screw rod 41 (refer to the a direction shown in the accompanying Figure 2The first nut 71 and the second nut 72 are both threadedly matched with the screw rod 41, and the first nut 71 and the second nut 72 are movable along the extension direction of the screw rod 41, the first elastic member 73 is arranged between the first nut 71 and the second nut 72, and is used for driving the first nut 71 and the second nut 72 to move in a direction away from each other.

[0046] It can be understood that the first nut 71 and the second nut 72 are both threadedly matched with the screw rod 41, and the rotation of the screw rod 41 can drive the first nut 71 and the second nut 72 to move simultaneously along the extension direction of the screw rod 41, so as to ensure that the distance between the first nut 71 and the second nut 72 in the extension direction of the screw rod 41 is always unchanged, and the first elastic member 73 is arranged between the first nut 71 and the second nut 72, so that the pre-tightening force of the first elastic member 73 remains unchanged, and the elastic force of the first elastic member 73 can simultaneously act on the end faces of the first nut 71 and the second nut 72 which are directed to each other, so that the thread of the first nut 71 is always in contact with the side surface of the screw thread of the screw rod 41 which is directed to the valve port 12, and the thread of the second nut 72 is always in contact with the side surface of the screw thread of the screw rod 41 which is away from the valve port 12, thereby ensuring the effectiveness of the adhesion of the first nut 71 and the second nut 72 to one side of the screw thread of the screw rod 41, reducing the axial gap between the first nut 71 and the second nut 72 and the screw rod 41, eliminating the amount of movement of the first nut 71 and the second nut 72 in cooperation with the screw rod 41, improving the stability of the movement of the valve core 6, improving the stability of the flow of the electronic expansion valve 100, improving the flow accuracy of the electronic expansion valve 100, and reducing the flow hysteresis of the electronic expansion valve 100 in the process of opening or closing.

[0047] It should be noted that the first elastic member 73 can be one, in which case the first elastic member 73 extends in the circumferential direction of the screw rod 41 and is loosely fitted on the screw rod 41, and the axial ends of the first elastic member 73 are respectively in abutment with the end faces of the first nut 71 and the second nut 72 which are directed to each other; or the first elastic member 73 can be multiple, in which case multiple first elastic members 73 are arranged on the outer side of the screw rod 41 and are spaced apart in the circumferential direction of the screw rod 41, and the two ends of each first elastic member 73 in the extension direction of the screw rod 41 are respectively in abutment with the end faces of the first nut 71 and the second nut 72 which are directed to each other. Both of the above-mentioned schemes can ensure that the elastic force of the first elastic member 73 acting on the first nut 71 and the second nut 72 is balanced, avoid the first nut 71 and the second nut 72 from deviating due to uneven force, ensure the normal cooperation between the first nut 71 and the second nut 72 and the screw rod 41, and improve the reliability and stability of the cooperation between the nut assembly 7 and the screw rod 41.

[0048] It should be noted that the first elastic member 73 can be one, in which case the first elastic member 73 extends in the circumferential direction of the screw rod 41 and is loosely fitted on the screw rod 41, and the axial ends of the first elastic member 73 are respectively in abutment with the end faces of the first nut 71 and the second nut 72 which are directed to each other; or the first elastic member 73 can be multiple, in which case multiple first elastic members 73 are arranged on the outer side of the screw rod 41 and are spaced apart in the circumferential direction of the screw rod 41, and the two ends of each first elastic member 73 in the extension direction of the screw rod 41 are respectively in abutment with the end faces of the first nut 71 and the second nut 72 which are directed to each other. Both of the above-mentioned schemes can ensure that the elastic force of the first elastic member 73 acting on the first nut 71 and the second nut 72 is balanced, avoid the first nut 71 and the second nut 72 from deviating due to uneven force, ensure the normal cooperation between the first nut 71 and the second nut 72 and the screw rod 41, and improve the reliability and stability of the cooperation between the nut assembly 7 and the screw rod 41. Figure 2As 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.

[0049] It is understandable that, such as Figure 2 As shown, when the coil component is energized, it 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 nut assembly 7 moves along the axial direction of the housing 1, which in turn drives the valve core 6 to move along the axial direction of the housing 1. When the valve core 6 opens the valve port 12, the medium can flow into the cavity 10 from one of the valve port 12 and the connecting hole 11, and then flow from the cavity 10 to the other of the valve port 12 and the connecting hole 11. When the valve core 6 closes the valve port 12, the medium in the cavity 10 cannot flow out from the valve port 12, and the medium outside the electronic expansion valve 100 cannot flow into the cavity 10 from the valve port 12. By opening or closing the valve port 12, different user needs can be met, and the user experience can be improved.

[0050] The electronic expansion valve 100 provided by the embodiment of the utility model, through the nut assembly 7 arranged in the cavity 10, is used for driving the valve core 6 to move along the axial direction of the shell 1, the nut assembly 7 includes the first nut 71, the second nut 72 and the first elastic piece 73, the first nut 71 and the second nut 72 are both sleeved on the screw rod 41 and are arranged at intervals along the extension direction of the screw rod 41, the first nut 71 and the second nut 72 are both in threaded cooperation with the screw rod 41, the rotation of the screw rod 41 can drive the first nut 71 and the second nut 72 to move along the extension direction of the screw rod 41 at the same time, the distance between the first nut 71 and the second nut 72 along the extension direction of the screw rod 41 is always kept unchanged, the first elastic piece 73 is arranged between the first nut 71 and the second nut 72, the pre-tightening force of the first elastic piece 73 is kept unchanged, is used for driving the first nut 71 and the second nut 72 to move towards the direction away from each other, so that the screw thread of the first nut 71 is always in contact with the side surface of the screw thread of the screw rod 41 towards the valve port 12, the screw thread of the second nut 72 is always in contact with the side surface of the screw thread of the screw rod 41 away from the valve port 12, the effectiveness that the first nut 71 and the second nut 72 are attached to one side of the screw thread of the screw rod 41 is guaranteed, the axial gap between the first nut 71 and the second nut 72 and the screw rod 41 can be reduced in the process that the electronic expansion valve 100 is opened or closed, the amount of movement of the first nut 71 and the second nut 72 and the screw rod 41 can be eliminated, the stability of the movement of the valve core 6 is improved, the stability of the flow of the electronic expansion valve 100 is improved, the flow accuracy of the electronic expansion valve 100 is improved, the flow hysteresis of the electronic expansion valve 100 in the process that the valve is opened or closed is reduced, and the use requirement of a user is met.

[0051] In some embodiments of the utility model, reference is made to the accompanying drawings Figure 2 As shown in the accompanying drawings, reference is made to the accompanying drawings Figure 4 The electronic expansion valve 100 further includes the bearing support 2, the bearing support 2 is arranged in the cavity 10, part of the valve core 6, the nut assembly 7 and part of the screw rod 41 are all located in the bearing support 2, the bearing support 2 has the second anti-rotation groove 25, the second anti-rotation groove 25 extends along the axial direction of the shell 1 and is located at the end of the bearing support 2 towards the valve port 12, the outer peripheral wall of the first nut 71 is provided with the second anti-rotation lug 711, the outer peripheral wall of the second nut 72 is provided with the third anti-rotation lug 721, the second anti-rotation lug 711 and the third anti-rotation lug 721 are both matched with the second anti-rotation groove 25, and the second anti-rotation lug 711 and the third anti-rotation lug 721 both extend along the extension direction of the second anti-rotation groove 25 (reference is made to the accompanying drawings Figure 2The first nut 71 and the second nut 72 can be prevented from rotating relative to the shell 1 by the cooperation of the second anti-rotation lug 711 and the third anti-rotation lug 721 with the second anti-rotation groove 25, so that the first nut 71 and the second nut 72 can only move in the axial direction of the shell 1 and cannot rotate, preventing the first nut 71 and the second nut 72 from being stuck during rotation, avoiding the situation that the nut assembly 7 does not move in the axial direction of the shell 1 due to rotation, thereby ensuring the driving effect of the nut assembly 7 on the valve core 6, avoiding the failure of the electronic expansion valve 100, ensuring the reliability and stability of the electronic expansion valve 100, and prolonging the service life of the electronic expansion valve 100.

[0052] It should be noted that, compared with directly opening the second anti-rotation groove on the inner wall of the shell, arranging the second anti-rotation groove 25 on the bearing support 2 can relatively reduce the production and processing difficulty of the electronic expansion valve 100 and reduce the production cost of the electronic expansion valve 100.

[0053] In a further embodiment of the present application, reference is made to the accompanying drawings Figure 2 As shown, the second anti-rotation groove 25 is spaced apart along the circumferential direction of the bearing support 2, and the second anti-rotation lug 711 and the third anti-rotation lug 721 are each one-to-one corresponding to the plurality of second anti-rotation grooves 25, which can limit the first nut 71 and the second nut 72 from multiple places spaced apart in the circumferential direction of the first nut 71 and the second nut 72, avoiding the rotation of the nut assembly 7 relative to the shell 1, ensuring that the nut assembly 7 can move in the circumferential direction of the shell 1, thereby ensuring the driving effect of the nut assembly 7 on the valve core 6, avoiding the failure of the electronic expansion valve 100, ensuring the reliability and stability of the electronic expansion valve 100, and prolonging the service life of the electronic expansion valve 100.

[0054] For example, the second anti-rotation groove 25 can be two, three, four, five or six spaced apart along the circumferential direction of the bearing support 2, the second anti-rotation lug 711 is two, three, four, five or six one-to-one corresponding to the plurality of second anti-rotation grooves 25, and the third anti-rotation lug 721 is two, three, four, five or six one-to-one corresponding to the plurality of second anti-rotation grooves 25.

[0055] In a specific example, reference is made to the accompanying drawings Figure 2As shown, the second anti-rotation groove 25 is two spaced apart along the circumferential direction of the bearing support 2, the two second anti-rotation grooves 25 are located on the opposite sides of the nut assembly 7, the second anti-rotation lug 711 is two corresponding to the two second anti-rotation grooves 25, the third anti-rotation lug 721 is two corresponding to the two second anti-rotation grooves 25, and the first nut 71 and the second nut 72 can be positioned from the two spaced apart in the circumferential direction of the first nut 71 and the second nut 72. The nut assembly 7 is prevented from rotating relative to the shell 1, ensuring that the nut assembly 7 can move along the circumferential direction of the shell 1, thereby ensuring the driving effect of the nut assembly 7 on the valve core 6, avoiding the failure of the electronic expansion valve 100, ensuring the reliability and stability of the electronic expansion valve 100, and prolonging the service life of the electronic expansion valve 100.

[0056] In a further embodiment of the present application, reference is made to the accompanying drawings Figure 2 As shown, in combination with reference to the accompanying drawings Figure 5 , the accompanying drawings Figure 6 and the accompanying drawings Figure 7 , the nut assembly 7 is arranged in the valve core 6, the screw rod 41 extends into the valve core 6 to cooperate with the nut assembly 7, the valve core 6 has a third anti-rotation groove 63, the third anti-rotation groove 63 is arranged on the circumferential wall of the valve core 6 and extends along the axial direction of the valve core 6 (refer to the a direction shown in the accompanying drawings Figure 2 ), the third anti-rotation groove 63 is located at one end of the valve core 6 away from the valve port 12, the third anti-rotation groove 63 is arranged opposite to the second anti-rotation groove 25, the second anti-rotation lug 711 and the third anti-rotation lug 721 are arranged in the second anti-rotation groove 25 and the third anti-rotation groove 63 at the same time, the second anti-rotation lug 711 cooperates with the second anti-rotation groove 25 and the third anti-rotation groove 63 at the same time, the third anti-rotation lug 721 cooperates with the second anti-rotation groove 25 and the third anti-rotation groove 63 at the same time, the second anti-rotation lug 711 and the third anti-rotation lug 721 can prevent the nut assembly 7 from rotating relative to the valve core 6 and prevent the valve core 6 from rotating relative to the shell 1 at the same time, the relative rotation between the nut assembly 7, the valve core 6 and the shell 1 is prevented, the uniqueness of the valve core 6 state is ensured, the uniqueness of the valve core 6 and the valve port 12 sealing line is ensured, the internal leakage level is low and the performance is stable, and the nut assembly 7 can be prevented from being stuck during rotation, avoiding the valve core 6 from moving along the axial direction of the shell 1 due to rotation, thereby avoiding the failure of the electronic expansion valve 100, ensuring the reliability and stability of the electronic expansion valve 100, and prolonging the service life of the electronic expansion valve 100.

[0057] In a further embodiment of the present application, reference is made to the accompanying drawings Figure 6 As shown, the valve core 6 further has a fifth limiting piece 64 and a sixth limiting piece 65, the fifth limiting piece 64 and the sixth limiting piece 65 are respectively located in the extension direction of the third anti-rotation groove 63 (refer to the a direction shown in the accompanying drawings Figure 2At both ends of direction a shown, the second anti-rotation lug 711 and the third anti-rotation lug 721 are located between the fifth limiting member 64 and the sixth limiting member 65. The fifth limiting member 64 is used to restrict the nut assembly 7 from moving away from the valve port 12, and the sixth limiting member 65 is used to restrict the nut assembly 7 from moving towards the valve port 12.

[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 nut assembly 7 moves along the axial direction of the housing 1. When the second anti-rotation lug 711 abuts against the fifth limiting member 64, it can restrict the nut assembly 7 from continuing to move relative to the valve core 6 in the direction away from the valve port 12, so that the nut assembly 7 drives the valve core 6 to move together in the direction away from the valve port 12. When the third anti-rotation lug 721 abuts against the sixth limiting member 65, it can restrict the nut assembly 7 from continuing to move relative to the valve core 6 in the direction closer to the valve port 12, so that the nut assembly 7 drives the valve core 6 to move together in the direction closer to the valve port 12.

[0059] In a further embodiment of this utility model, reference is made to the appendix. Figure 5 and attached Figure 6 As shown, the valve core 6 includes a body portion 61 and a stop portion 62. The body portion 61 is located along the axial direction of the valve core 6 (see attached diagram). Figure 2 Extending in the direction shown (a), the third anti-rotation groove 63 is provided on the peripheral wall of the body part 61. The end face of the third anti-rotation groove 63 near the valve port 12 is configured as the sixth limiting member 65. The stop part 62 is provided at the end of the body part 61 away from the valve port 12 and is fixedly connected to the body part 61. The screw 41 passes through the stop part 62. The stop part 62 is spaced apart from the sixth limiting member 65. The end face of the stop part 62 facing the sixth limiting member 65 is configured as the fifth limiting member 64. By making the body part 61 and the stop part 62 separate parts, the manufacturing difficulty of the valve core 6 can be reduced, and it is convenient to assemble the nut assembly 7 into the valve core 6, thereby reducing the assembly difficulty of the electronic expansion valve 100.

[0060] It should be noted that the reference appendix Figure 2 and attached Figure 8 As shown, the screw 41 passes through the stop part 62, so that the stop part 62 can play a radial limiting role on the screw 41, preventing the screw 41 from deviating during rotation, ensuring the normal rotation of the screw 41, and thus preventing the rotor component 42 from deviating due to the screw 41 deviating, preventing the rotor component 42 from rubbing against the inner wall of the housing 1, thereby avoiding power loss.

[0061] In a further embodiment of this utility model, reference is made to the appendix. Figure 2As shown, the electronic expansion valve 100 further comprises a driving bearing 5, which is arranged between the screw rod 41 and the bearing support 2, the outer ring of the driving bearing 5 is fixed with the bearing support 2, the inner ring is fixed with the screw rod 41 and rotates synchronously, the arrangement of the driving bearing 5 can guarantee the normal rotation of the screw rod 41, and the arrangement of the driving bearing 5 can fix the screw rod 41, further avoiding the deviation of the screw rod 41 during rotation.

[0062] It should be noted that the bearing support 2 is a stamping part, through the cooperation of the driving bearing 5 and the bearing support 2, the nut structure in the prior art can be replaced, while ensuring the positioning effect of the screw rod 41, without threading on the bearing support 2, reducing the precision requirement of the bearing support 2, reducing the production cost of the electronic expansion valve 100, and because the nut structure in the prior art is a PEEK (polyether ether ketone) or copper part, and is driven by threads, it is easy to rub off the debris, which affects the product action, and the utility model avoids the problem of rubbing off the debris, guarantees the normal use of the electronic expansion valve 100, and prolongs the service life of the electronic expansion valve 100.

[0063] In still further embodiments of the utility model, referring to the accompanying drawings Figure 2 As shown, the bearing support 2 further has a third limiting piece 23 and a fourth limiting piece 24, the third limiting piece 23 and the fourth limiting piece 24 are both located on the side of the valve core 6 away from the valve port 12, the third limiting piece 23 is used for limiting the movement of the driving bearing 5 towards the direction close to the valve port 12, and the fourth limiting piece 24 is used for limiting the movement of the driving bearing 5 towards the direction away from the valve port 12, the third limiting piece 23 and the fourth limiting piece 24 can limit the driving bearing 5 from both sides of the axial direction (referring to the a direction shown in the accompanying drawings) of the driving bearing 5, and together position the driving bearing 5, avoid the movement of the driving bearing 5 along the axial direction of the shell 1, guarantee the cooperation of the driving bearing 5 and the screw rod 41, and guarantee the normal rotation of the screw rod 41. Figure 2 As shown, the bearing support 2 further has a third limiting piece 23 and a fourth limiting piece 24, the third limiting piece 23 and the fourth limiting piece 24 are both located on the side of the valve core 6 away from the valve port 12, the third limiting piece 23 is used for limiting the movement of the driving bearing 5 towards the direction close to the valve port 12, and the fourth limiting piece 24 is used for limiting the movement of the driving bearing 5 towards the direction away from the valve port 12, the third limiting piece 23 and the fourth limiting piece 24 can limit the driving bearing 5 from both sides of the axial direction (referring to the a direction shown in the accompanying drawings) of the driving bearing 5, and together position the driving bearing 5, avoid the movement of the driving bearing 5 along the axial direction of the shell 1, guarantee the cooperation of the driving bearing 5 and the screw rod 41, and guarantee the normal rotation of the screw rod 41.

[0064] In still further embodiments of the utility model, referring to the accompanying drawings Figure 3 As shown, the bearing support 2 comprises a support body 21 and a limiting column 22, the support body 21 extends along the axial direction of the shell 1, the second anti-rotation groove 25 is arranged on the peripheral wall of the support body 21, and the limiting column 22 and the support body 21 are arranged and connected along the axial direction of the shell 1, and the support body 21 and the limiting column 22 are separate parts, which can reduce the production and processing difficulty of the bearing support 2 and the production difficulty of the electronic expansion valve 100.

[0065] Further, referring to the accompanying drawings Figure 2 and the accompanying drawings Figure 3As shown, the limiting column 22 is located in the support body 21, the end face of the limiting column 22 facing the valve port 12 is configured as the fourth limiting piece 24, the inner peripheral wall of the support body 21 is provided with a limiting protrusion 211, the limiting protrusion 211 is spaced apart from the limiting column 22, the end face of the limiting protrusion 211 facing the limiting column 22 is configured as the third limiting piece 23, when assembling the electronic expansion valve 100, the drive bearing 5 and the screw rod 41 can be assembled to the support body 21 first, then the limiting column 22 is assembled to the support body 21, after confirming the accurate position, the support body 21 and the limiting column 22 are welded and fixed, so that the drive bearing 5 can be assembled to the bearing support 2 conveniently, the assembly difficulty of the drive bearing 5 can be reduced, and the assembly efficiency of the entire electronic expansion valve 100 is guaranteed.

[0066] Alternatively, the limiting column 22 is sleeved outside the support body 21, the inner peripheral wall of the support body 21 is provided with a first protrusion and a second protrusion, the first protrusion and the second protrusion are spaced apart in the axial direction (referring to the a direction shown in the figure) of the support body 21, and the end faces of the first protrusion and the second protrusion facing each other are respectively configured as the third limiting piece 23 and the fourth limiting piece 24. Figure 2 It is to be noted that the support body 21 comprises a first support and a second support, the first support and the second support are separate parts and are arranged along the axial direction of the shell 1, the first support is located on the side of the second support away from the limiting column 22, when assembling the electronic expansion valve 100, the first support can be assembled into the shell 1 and fixed first, then the drive bearing 5 and the screw rod 41 are assembled to the first support, so that the end face of the drive bearing 5 away from the guide piece 43 abuts against the third limiting piece 23 of the first protrusion, then the second support is assembled to the drive bearing 5, so that the end face of the drive bearing 5 facing the guide piece 43 abuts against the fourth limiting piece 24 of the second protrusion, then the second support is fixed with the first support or the shell 1, finally the limiting column 22 is sleeved on the second support and is fixedly connected with the second support, so that the assembly of the drive bearing 5 can be realized, the assembly difficulty of the drive bearing 5 is reduced, and the assembly efficiency of the entire electronic expansion valve 100 is guaranteed.

[0067] In a further embodiment of the present application, reference is made to the a direction shown in the figure. Figure 2 And the b direction shown in the figure. Figure 3 As shown, the bearing support 2 is also provided with a first anti-rotation groove 26, a first limiting piece 27 and a second limiting piece 28, the first anti-rotation groove 26 is arranged on the peripheral wall of the bearing support 2 and extends along the axial direction of the shell 1, the first anti-rotation groove 26 is located on the side of the second anti-rotation groove 25 away from the valve port 12, the first limiting piece 27 and the second limiting piece 28 are respectively located on the extension direction of the first anti-rotation groove 26 (referring to the a direction shown in the figure). Figure 2The electronic expansion valve 100 further comprises a stopper 3 arranged in the bearing support 2, the screw rod 41 is arranged in the stopper 3 and is threadedly connected with the stopper 3, the stopper 3 is driven to move along the axial direction of the shell 1, the outer peripheral wall of the stopper 3 is provided with a first anti-rotation lug 31 matched with the first anti-rotation groove 26, the first anti-rotation lug 31 is located between the first limiting piece 27 and the second limiting piece 28, and the first limiting piece 27 and the second limiting piece 28 are respectively used for limiting the movement of the stopper 3 along the axial direction of the shell 1.

[0068] It can be understood that, in the process that the screw rod 41 drives the stopper 3 to move along the axial direction of the shell 1, the stopper 3 is guided and positioned by the cooperation between the first anti-rotation lug 31 and the first anti-rotation groove 26, so that the stopper 3 only moves along the axial direction of the shell 1, the rotation of the stopper 3 is avoided, the stopper 3 is prevented from being stuck during the rotation, the stopper 3 is prevented from not moving along the axial direction of the shell 1 due to the rotation, the electronic expansion valve 100 is prevented from being invalid, the reliability and stability of the electronic expansion valve 100 are ensured, and the service life of the electronic expansion valve 100 is prolonged.

[0069] As shown in Figure 2 When the coil component is energized, the coil component drives the rotor component 42 to rotate, the screw rod 41 is fixedly connected with the rotor component 42 through the guide 43, so that the rotor component 42 drives the screw rod 41 to rotate, under the driving of the screw rod 41, the stopper 3 moves along the axial direction of the shell 1 until the first anti-rotation lug 31 abuts against the first limiting piece 27 or the second limiting piece 28, the movement of the stopper 3 along the axial direction of the shell 1 is limited, the screw rod 41 cannot continue to rotate because the screw rod 41 is threadedly connected with the stopper 3, and the purpose of stopping is achieved.

[0070] It can be understood that, in the prior art, the limiting of the valve core is often realized by the cooperation of a slip ring and a spring, the rotor component needs to move along the axial direction of the shell 1 while rotating, and in the utility model, the movement of the stopper 3 along the axial direction of the shell 1 is limited by the abutment between the first anti-rotation lug 31 and the first limiting piece 27 or the second limiting piece 28, and then the rotation of the screw rod 41 is limited, the limiting of the valve core 6 is realized, the rotor component 42 does not need to move along the axial direction of the shell 1, the torque is stably output, so that the space for the rotor component 42 to move along the axial direction of the shell 1 in the shell 1 is not needed, the amount of rotor magnetic powder and the axial length of the rotor component 42 are reduced, the overall height of the electronic expansion valve 100 can be reduced, the axial space of the electronic expansion valve 100 is fully utilized, and the miniaturization of the electronic expansion valve 100 is facilitated, and the cost of the electronic expansion valve 100 is reduced.

[0071] And, because the stopper 3 and the screw rod 41 are threadedly matched, the axial height of the screw rod 41 can be reduced through a small pitch and multiple turns, effectively reducing the height caused by the cumulative diameter and pitch of the spring stopper in the prior art, further reducing the height of the electronic expansion valve 100, and being conducive to the miniaturization of the electronic expansion valve 100. At the same time, because the slip ring and spring design are cancelled, the noise problem caused by the slip ring to the spring stopper is solved, the noise of the electronic expansion valve 100 during use is reduced, the problem of excessive force on the spring and breakage is avoided, and the service life of the electronic expansion valve 100 is relatively prolonged.

[0072] Optionally, the thread matching between the stopper 3 and the screw rod 41 is not limited to ordinary threads, and can also be set in the form of non-self-locking internal threads, trapezoidal threads, circular threads or rectangular threads. The bearing support 2 can be a metal piece or an injection molded piece, which is not limited here.

[0073] For example, as shown in Figure 2 the side end face of the limiting column 22 away from the guide 43 is located on the side of the support body 21 away from the guide 43, the first anti-rotation groove 26 is arranged on the peripheral wall of the limiting column 22, one end of the first anti-rotation groove 26 away from the guide 43 is open, the end of the first anti-rotation groove 26 close to the guide 43 is configured as a first limiting piece 27, and the end of the support body 21 towards the guide 43 is configured as a second limiting piece 28.

[0074] Further, referring to the accompanying Figure 2 the stopper 3 is an integral piece, the production cost is low, the number of parts of the electronic expansion valve 100 can be relatively reduced, the assembly process of the electronic expansion valve 100 is simplified, and the assembly efficiency of the electronic expansion valve 100 is improved. It should be noted that, as shown in Figure 2 in assembling the electronic expansion valve 100, the drive bearing 5 and the screw rod 41 are assembled onto the support body 21, then the stopper 3 is threadedly matched with the screw rod 41, the stopper 3 is moved towards the second limiting piece 28, until the first anti-rotation lug 31 abuts against the second limiting piece 28, and finally the limiting column 22 is assembled to the support body 21, after confirming that the first anti-rotation groove 26 is aligned with the first anti-rotation lug 31, the support body 21 and the limiting column 22 are welded and fixed.

[0075] It should be noted that, by providing the screw rod 41 with a screw rod 41 axial direction (see Figure 2The two sections of threads are spaced apart in the a direction shown, are respectively threaded with the stopper 3 and the nut assembly 7, and are provided with the driving bearing 5 between the two sections of threads in the axial direction of the shell 1, so that the rotation of the rotor component 42 at the same height can be stably controlled, the effective transmission of the stator component and the rotor component 42 is guaranteed, the axial movement of the rotor component 42 is reduced, the length of the rotor component 42 in the axial direction of the shell 1 is reduced, and the cost of the electronic expansion valve 100 is reduced.

[0076] Further, the pitches of the two sections of threads on the screw rod 41 can be different to meet different requirements and realize respective functions. For example, when the stroke of the valve core 6 in the axial direction of the shell 1 is short, the thread on the screw rod 41 matched with the stopper 3 can be set as a large-size thread pitch to achieve the purpose of stopping; when the stroke of the valve core 6 in the axial direction of the shell 1 is long, in order to guarantee the accuracy of the valve core 6 for adjusting the flow at the valve port 12, the thread on the screw rod 41 matched with the nut assembly 7 needs to be set as a small-size thread pitch, and the thread on the screw rod 41 matched with the stopper 3 can be set as a small-size thread pitch, so that even if the number of rotation of the stopper 3 is large, the axial displacement is still small; when the stroke of the valve core 6 in the axial direction of the shell 1 is long, the accuracy of the valve core 6 for adjusting the flow at the valve port 12 is high, and the on-off time requirement is short, the thread on the screw rod 41 matched with the nut assembly 7 can use double-thread or multi-thread, so that the lead is increased under the condition of fine pitch, the flow adjustment accuracy is improved, and the valve opening time is accelerated, and the thread on the screw rod 41 matched with the stopper 3 can be adapted to the thread pitch according to the stroke.

[0077] In a further embodiment of the present application, referring to the accompanying drawings Figure 2 As shown, the first anti-rotation lugs 31 are spaced apart in the circumferential direction of the stopper 3, and the first anti-rotation grooves 26 are one-to-one corresponding to the plurality of first anti-rotation lugs 31, so that the stopper 3 can be positioned from the plurality of positions spaced apart in the circumferential direction of the stopper 3, the rotation of the stopper 3 relative to the bearing support 2 is avoided, the movement of the stopper 3 in the axial direction of the shell 1 is ensured, and thus the electronic expansion valve 100 is prevented from being invalid, the reliability and stability of the electronic expansion valve 100 are guaranteed, and the service life of the electronic expansion valve 100 is prolonged. For example, the first anti-rotation lugs 31 can be two, three, four, five or six spaced apart in the circumferential direction of the stopper 3, and the first anti-rotation grooves 26 can be two, three, four, five or six one-to-one corresponding to the plurality of first anti-rotation lugs 31.

[0078] In a specific example, referring to the accompanying drawings Figure 2As shown, the first anti-rotation lug 31 is two spaced apart along the circumferential direction of the stopper 3, and the two first anti-rotation lugs 31 are located on opposite sides of the stopper 3, and the first anti-rotation groove 26 is two corresponding to the two first anti-rotation lugs 31, which can position the stopper 3 from the two spaced apart in the circumferential direction of the stopper 3, further avoid the stopper 3 relative to the bearing support 2 rotation, ensure that the stopper 3 is movable along the axial direction of the shell 1, avoid the electronic expansion valve 100 failure, protect the reliability and stability of the electronic expansion valve 100, prolong the service life of the electronic expansion valve 100.

[0079] In some embodiments of the utility model, reference is made to the accompanying drawings Figure 2 As shown, the cavity 10 includes the first cavity 101 and the second cavity 102 arranged in the axial direction of the cavity 10 (reference to the accompanying drawings Figure 2 The a direction shown), the communication hole 11 and the valve port 12 are both communicated with the first cavity 101, the valve port 12 is arranged at one end of the first cavity 101 away from the second cavity 102, the valve core 6 and the nut assembly 7 are both located in the first cavity 101, and part of the driving assembly 4 is located in the second cavity 102, the valve core 6 has a balance flow channel 60 extending along the axial direction of the cavity 10, both ends of the balance flow channel 60 along the axial direction of the cavity 10 are open, and at least part of the outer circumferential wall of the bearing support 2 is spaced apart from the inner circumferential wall of the shell 1 along the circumferential direction of the bearing support 2.

[0080] Further, reference is made to the accompanying drawings Figure 2 As shown, since the balance sealing ring 67 is arranged between the outer circumferential wall of the valve core 6 and the inner circumferential wall of the first cavity 101, the first cavity 101 can be divided into the first sub-cavity 1011 and the second sub-cavity 1012, the first sub-cavity 1011 and the second sub-cavity 1012 are arranged along the axial direction of the shell 1, the second sub-cavity 1012 is always communicated with the second cavity 102 through the gap between the outer circumferential wall of the bearing support 2 and the inner circumferential wall of the shell 1, the first sub-cavity 1011 is located on the side of the second sub-cavity 1012 away from the second cavity 102, and the valve port 12 and the communication hole 11 are both communicated with the first sub-cavity 1011. Specifically, reference is made to the accompanying drawings Figure 3 And the accompanying drawings Figure 4 As shown, the outer circumferential wall of the bearing support 2 has a notch 29, along the axial direction of the bearing support 2 (reference to the accompanying drawings Figure 2 The a direction shown), the notch 29 is arranged opposite to the second anti-rotation groove 25, for communicating the second sub-cavity 1012 and the second cavity 102.

[0081] It can be understood that the medium enters the balance flow channel 60 from the end of the balance flow channel 60 facing the valve port 12, and flows into the second sub-cavity 1012 along the balance flow channel 60 from the third anti-rotation groove 63, and then the medium flows from the inside of the bearing support 2 to the gap between the outer peripheral wall of the bearing support 2 and the inner peripheral wall of the shell 1 by the second anti-rotation groove 25, and then flows into the second cavity 102 by the notch 29, so 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 balanced state during switching, avoiding affecting the normal movement of the valve core 6 in the axial direction of the shell 1. For example, the medium can be refrigerant.

[0082] In a further embodiment of the present application, referring to FIGS. 1-3, Figure 2 As shown in FIGS. 1-3, in the direction from the second cavity 102 to the first cavity 101, the balance flow channel 60 comprises a first flow channel 601 and a second flow channel 602 arranged in sequence and communicated, the inner diameter of the first flow channel 601 is smaller than the inner diameter of the second flow channel 602, the nut assembly 7 is located in the second flow channel 602, the second flow channel 602 is provided with a second elastic member 66, one end of the extension direction (referring to the a direction shown in FIG. 3) of the second elastic member 66 abuts against the end of the nut assembly 7 facing the valve port 12, 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 66 is in a compressed state, and is used to drive the nut assembly 7 to move in the direction away from the valve port 12. Figure 2 As shown in FIGS. 1-3, in the direction from the second cavity 102 to the first cavity 101, the balance flow channel 60 comprises a first flow channel 601 and a second flow channel 602 arranged in sequence and communicated, the inner diameter of the first flow channel 601 is smaller than the inner diameter of the second flow channel 602, the nut assembly 7 is located in the second flow channel 602, the second flow channel 602 is provided with a second elastic member 66, one end of the extension direction (referring to the a direction shown in FIG. 3) of the second elastic member 66 abuts against the end of the nut assembly 7 facing the valve port 12, 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 66 is in a compressed state, and is used to drive the nut assembly 7 to move in the direction away from the valve port 12.

[0083] As shown in FIGS. 1-3, in the direction from the second cavity 102 to the first cavity 101, the balance flow channel 60 comprises a first flow channel 601 and a second flow channel 602 arranged in sequence and communicated, the inner diameter of the first flow channel 601 is smaller than the inner diameter of the second flow channel 602, the nut assembly 7 is located in the second flow channel 602, the second flow channel 602 is provided with a second elastic member 66, one end of the extension direction (referring to the a direction shown in FIG. 3) of the second elastic member 66 abuts against the end of the nut assembly 7 facing the valve port 12, 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 66 is in a compressed state, and is used to drive the nut assembly 7 to move in the direction away from the valve port 12. Figure 2 As shown in FIGS. 1-3, in the direction from the second cavity 102 to the first cavity 101, the balance flow channel 60 comprises a first flow channel 601 and a second flow channel 602 arranged in sequence and communicated, the inner diameter of the first flow channel 601 is smaller than the inner diameter of the second flow channel 602, the nut assembly 7 is located in the second flow channel 602, the second flow channel 602 is provided with a second elastic member 66, one end of the extension direction (referring to the a direction shown in FIG. 3) of the second elastic member 66 abuts against the end of the nut assembly 7 facing the valve port 12, 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 66 is in a compressed state, and is used to drive the nut assembly 7 to move in the direction away from the valve port 12.

[0084] Other configurations and operations of the electronic expansion valve 100 according to the embodiments of the present application are known to those skilled in the art, and thus will not be described in detail herein.

[0085] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" 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 present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the skilled person in the art can combine and combine the features of different embodiments or examples described in the present application and the features of different embodiments or examples, without contradiction.

[0086] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. An electronic expansion valve characterized by, The utility model relates to a valve, comprising: a housing (1) having a cavity (10) and a communication hole (11) and a valve port (12) in communication with the cavity (10), the communication hole (11) is arranged on the peripheral wall of the housing (1), and the valve port (12) is arranged at one axial end of the cavity (10); a drive assembly (4) arranged on the housing (1) and comprising a screw rod (41) arranged in the cavity (10) and extending in the axial direction of the housing (1); a valve core (6) arranged in the cavity (10) and movable in the axial direction of the housing (1) for opening or closing the valve port (12); a nut assembly (7) arranged in the cavity (10) for driving the valve core (6) to move in the axial direction of the housing (1), the nut assembly (7) comprising a first nut (71), a second nut (72) and a first elastic member (73), the first nut (71) and the second nut (72) are both sleeved on the screw rod (41) and arranged at intervals in the extension direction of the screw rod (41), the first nut (71) and the second nut (72) are movable in the extension direction of the screw rod (41), and the first elastic member (73) is arranged between the first nut (71) and the second nut (72) for driving the first nut (71) and the second nut (72) to move towards the direction away from each other.

2. The electronic expansion valve according to claim 1, characterized in that Further comprising: a bearing support (2) arranged in the cavity (10), part of the valve core (6), the nut assembly (7) and part of the screw rod (41) are located in the bearing support (2), the bearing support (2) has a second anti-rotation groove (25) extending in the axial direction of the housing (1), the outer peripheral wall of the first nut (71) is provided with a second anti-rotation lug (711), the outer peripheral wall of the second nut (72) is provided with a third anti-rotation lug (721), the second anti-rotation lug (711) and the third anti-rotation lug (721) are matched with the second anti-rotation groove (25), and the second anti-rotation lug (711) and the third anti-rotation lug (721) are movable in the extension direction of the second anti-rotation groove (25).

3. The electronic expansion valve according to claim 2, characterized in that The second anti-rotation groove (25) is a plurality of grooves spaced apart in the circumferential direction of the bearing support (2), and the second anti-rotation lug (711) and the third anti-rotation lug (721) are a plurality of lugs corresponding to the plurality of second anti-rotation grooves (25) one by one.

4. The electronic expansion valve according to claim 2, wherein The nut assembly (7) is arranged in the valve core (6), the screw rod (41) extends into the valve core (6) to cooperate with the nut assembly (7), the valve core (6) has a third anti-rotation groove (63), the third anti-rotation groove (63) is arranged on the peripheral wall of the valve core (6) and extends in the axial direction of the valve core (6), the third anti-rotation groove (63) is arranged opposite to the second anti-rotation groove (25), and the second anti-rotation lug (711) and the third anti-rotation lug (721) are arranged in the second anti-rotation groove (25) and the third anti-rotation groove (63) at the same time.

5. The electronic expansion valve according to claim 4, wherein The valve core (6) further has a fifth limiting piece (64) and a sixth limiting piece (65), the fifth limiting piece (64) and the sixth limiting piece (65) are located at two ends of the extending direction of the third anti-rotation groove (63) respectively, the second anti-rotation lug (711) and the third anti-rotation lug (721) are located between the fifth limiting piece (64) and the sixth limiting piece (65), the fifth limiting piece (64) is used for limiting the movement of the nut assembly (7) in the direction away from the valve port (12), and the sixth limiting piece (65) is used for limiting the movement of the nut assembly (7) in the direction close to the valve port (12).

6. The electronic expansion valve according to claim 5, wherein The valve core (6) comprises: a body portion (61) extending in the axial direction of the valve core (6), the third anti-rotation groove (63) is arranged on the peripheral wall of the body portion (61), and the end face of the third anti-rotation groove (63) close to the valve port (12) is configured as the sixth limiting piece (65); a stop portion (62) arranged at one end of the body portion (61) away from the valve port (12) and fixedly connected with the body portion (61), the screw rod (41) is arranged in the stop portion (62), the stop portion (62) is spaced apart from the sixth limiting piece (65), and the end face of the stop portion (62) toward the sixth limiting piece (65) is configured as the fifth limiting piece (64).

7. The electronic expansion valve according to claim 5, wherein The electronic expansion valve (100) further comprises: a drive bearing (5) arranged between the screw rod (41) and the bearing support (2).

8. The electronic expansion valve according to claim 7, characterized in that The bearing support (2) further has a third limiting piece (23) and a fourth limiting piece (24), the third limiting piece (23) and the fourth limiting piece (24) are located on the side of the valve core (6) away from the valve port (12), the third limiting piece (23) is used for limiting the movement of the drive bearing (5) in the direction close to the valve port (12), and the fourth limiting piece (24) is used for limiting the movement of the drive bearing (5) in the direction away from the valve port (12).

9. The electronic expansion valve according to claim 8, wherein The bearing support (2) comprises a support body (21) extending along the axial direction of the shell (1), and a limiting column (22), the second anti-rotation groove (25) is arranged on the peripheral wall of the support body (21), the limiting column (22) and the support body (21) are arranged along the axial direction of the shell (1) and connected, The limiting column (22) is located in the support body (21), the end face of the limiting column (22) facing the valve port (12) is configured as the fourth limiting part (24), the inner peripheral wall of the support body (21) has a limiting protrusion (211), the limiting protrusion (211) is spaced apart from the limiting column (22), and the end face of the limiting protrusion (211) facing the limiting column (22) is configured as the third limiting part (23). Or, the limiting column (22) is sleeved outside the support body (21), the inner peripheral wall of the support body (21) has a first protrusion and a second protrusion, the first protrusion and the second protrusion are spaced apart in the axial direction of the support body (21), and the end faces of the first protrusion and the second protrusion facing each other are respectively configured as the third limiting part (23) and the fourth limiting part (24).

10. The electronic expansion valve according to claim 2, wherein The bearing support (2) further has a first anti-rotation groove (26), a first limiting part (27) and a second limiting part (28), the first anti-rotation groove (26) is arranged on the peripheral wall of the bearing support (2) and extends along the axial direction of the shell (1), the first anti-rotation groove (26) is located on the side of the second anti-rotation groove (25) away from the valve port (12), the first limiting part (27) and the second limiting part (28) are respectively located at the two ends of the extension direction of the first anti-rotation groove (26), and the electronic expansion valve (100) further comprises: A stop piece (3) is arranged in the bearing support (2), the screw rod (41) is arranged in the stop piece (3) and is threadedly connected with the stop piece (3), the stop piece (3) is used for driving the stop piece (3) to move along the axial direction of the shell (1), the outer peripheral wall of the stop piece (3) has a first anti-rotation lug (31) matched with the first anti-rotation groove (26), the first anti-rotation lug (31) is located between the first limiting part (27) and the second limiting part (28), and the first limiting part (27) and the second limiting part (28) are respectively used for limiting the stop piece (3) to move along the axial direction of the shell (1).

11. The electronic expansion valve according to claim 10, wherein The first anti-rotation lug (31) is a plurality of lugs spaced apart along the circumferential direction of the stop piece (3), and the first anti-rotation groove (26) is a plurality of grooves corresponding to the plurality of first anti-rotation lugs (31).

12. The electronic expansion valve according to claim 1, wherein The cavity (10) comprises a first cavity (101) and a second cavity (102) arranged in the axial direction of the cavity (10), the communication hole (11) and the valve port (12) both communicate with the first cavity (101), the valve port (12) is arranged at the end of the first cavity (101) away from the second cavity (102), the valve core (6) and the nut assembly (7) are both located in the first cavity (101), part of the drive assembly (4) is located in the second cavity (102), the valve core (6) has a balance flow channel (60) extending in the axial direction of the cavity (10), both ends of the balance flow channel (60) are open in the axial direction of the cavity (10).

13. The electronic expansion valve according to claim 12, wherein In the direction from the second cavity (102) to the first cavity (101), the balance flow channel (60) comprises a first flow channel (601) and a second flow channel (602) arranged in sequence and communicated, the inner diameter of the first flow channel (601) is smaller than that of the second flow channel (602), the nut assembly (7) is located in the second flow channel (602), a second elastic member (66) is arranged in the second flow channel (602), one end of the extension direction of the second elastic member (66) abuts against the end of the nut assembly (7) facing the valve port (12), the other end abuts against the inner bottom wall of the second flow channel (602) facing the first flow channel (601), and the second elastic member (66) is in a compressed state.

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