CN220792090U - Electronic expansion valve, thermal management system and vehicle - Google Patents

Abstract

The utility model discloses an electronic expansion valve, a thermal management system and a vehicle, wherein the electronic expansion valve comprises: the valve seat assembly is provided with a valve port; the valve needle assembly is arranged on the valve seat assembly in a reciprocating manner so as to open or close the valve port; a transition member cooperating with the valve needle assembly such that rotation of the transition member translates into reciprocal movement of the valve needle assembly; the valve seat assembly is provided with a first stop, and the valve needle assembly is suitable for stopping with the first stop to limit the movement displacement of the valve needle assembly. According to the electronic expansion valve provided by the embodiment of the utility model, the first stopping part on the valve seat assembly is utilized for limiting the movement of the valve needle assembly, when the valve needle assembly is stopped against the first stopping part, the axial position of the valve needle assembly when the electronic expansion valve is fully opened can be accurately controlled due to the fact that the first stopping part is static relative to the valve seat assembly, and meanwhile, the abrasion to the valve needle assembly is conveniently reduced.

Description

Electronic expansion valve, thermal management system and vehicle

Technical Field

The utility model relates to the technical field of electronic expansion valves, in particular to an electronic expansion valve, a thermal management system and a vehicle.

Background

In the electronic expansion valve in the related art, the determination of the fully opened state of the electronic expansion valve is not accurate enough, resulting in a decrease in the operational reliability of the electronic expansion valve.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the electronic expansion valve, which can accurately control the axial position of the valve needle assembly when the electronic expansion valve is fully opened by utilizing the first stop part on the valve seat assembly to limit the movement of the valve needle assembly, and simultaneously, the electronic expansion valve is convenient for reducing the abrasion suffered by the valve needle assembly because the first stop part is static relative to the valve seat assembly when the valve needle assembly is abutted against the first stop part.

The utility model also provides a thermal management system with the electronic expansion valve and a vehicle.

An electronic expansion valve according to an embodiment of the first aspect of the present utility model includes: the valve seat assembly is provided with a valve port; the valve needle assembly can be arranged on the valve seat assembly in a reciprocating manner so as to open or close the valve port; a transition member cooperating with the valve needle assembly such that rotation of the transition member translates into reciprocal movement of the valve needle assembly; the valve seat assembly is provided with a first stop, and the valve needle assembly is suitable for stopping with the first stop to limit the movement displacement of the valve needle assembly.

According to the electronic expansion valve provided by the embodiment of the utility model, the first stopping part on the valve seat assembly is utilized for limiting the movement of the valve needle assembly, and when the valve needle assembly is stopped against the first stopping part, the first stopping part is static relative to the valve seat assembly, so that the relative displacement between the first stopping part and the valve needle assembly can be reduced, and the abrasion to which the valve needle assembly is subjected is further facilitated to be reduced.

In addition, the electronic expansion valve according to the above embodiment of the present utility model may further have the following additional technical features:

according to some embodiments of the utility model, the electronic expansion valve further comprises: a guide block secured to the valve needle assembly; the valve seat assembly comprises a guide seat, and the guide seat is installed in the valve seat assembly; the guide block cooperates with the guide seat to limit the rotational freedom of the valve needle assembly.

According to some embodiments of the utility model, the guide seat is provided with a moving cavity, the guide block is reciprocally arranged in the moving cavity, a first stop part is arranged on one side of the moving cavity, which is away from the valve port, and the first stop part is suitable for being matched with the guide block to limit the moving displacement of the guide block.

According to some embodiments of the utility model, the outer peripheral wall of the guide block in a cross section along the radial direction of the needle assembly is formed non-circular, and at least a part of the inner wall of the moving chamber is formed non-circular to cooperate with the guide block.

According to some embodiments of the utility model, the valve needle assembly comprises: the valve rod is provided with a first stop surface and a second stop surface, and the first stop surface and the second stop surface are arranged at intervals in the moving direction of the valve rod; a valve needle provided with a second stop, at least a portion of which is located between the first and second stop surfaces, the valve needle being movable relative to the valve stem such that the second stop is in switching abutment with the first and second stop surfaces; and the elastic piece is respectively connected with the valve rod and the valve needle, and the elastic piece applies a force with a trend of moving away from the valve rod towards the valve needle.

According to some alternative embodiments of the utility model, the valve stem comprises a first portion and a second portion, the first portion being located on a side of the second portion facing the valve needle, the first portion having a larger diameter than the second portion, an end surface of the first portion beyond the second portion defining the first stop surface.

According to some alternative embodiments of the utility model, an end surface of the guide block facing the first stop surface defines the second stop surface.

According to some embodiments of the utility model, the valve stem further comprises a third portion, the third portion being connected to the second portion, the second portion having a diameter greater than the diameter of the third portion, the guide block being sleeved over the third portion and abutting the second portion.

In some embodiments, the valve stem further has a guide surface located on a side of the third portion facing away from the second portion, the guide surface extending obliquely toward the third portion for guiding the mounting of the guide block.

According to some alternative embodiments of the utility model, the valve needle is provided with a containing cavity therein, and the elastic element is arranged in the containing cavity.

According to some embodiments of the utility model, the side wall of the accommodating cavity is provided with a communication hole penetrating through the side wall.

According to a second aspect of the present utility model an embodiment proposes a thermal management system comprising an electronic expansion valve according to an embodiment of the first aspect of the present utility model.

According to a third aspect of the utility model, a vehicle is provided, comprising a thermal management system according to an embodiment of the second aspect of the utility model.

Additional aspects and advantages of the utility model 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 utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic structural view of an electronic expansion valve according to an embodiment of the present utility model.

Fig. 2 is a cross-sectional view at A-A in fig. 1.

Fig. 3 is a schematic view of a part of the structure of an electronic expansion valve according to an embodiment of the present utility model.

Fig. 4 is a cross-sectional view of a portion of the construction of an electronic expansion valve in accordance with an embodiment of the present utility model, with the valve needle assembly closing the valve port.

Fig. 5 is an enlarged view at M in fig. 4.

Fig. 6 is a cross-sectional view of a portion of the structure of an electronic expansion valve in accordance with an embodiment of the present utility model with the valve needle assembly opening the valve port and the guide block in abutting engagement with the first stop.

Fig. 7 is an enlarged view at N in fig. 6.

Fig. 8 is a schematic structural view of a valve needle assembly according to an embodiment of the present utility model.

Fig. 9 is a schematic structural view of a valve needle assembly according to an embodiment of the present utility model.

Fig. 10 is a cross-sectional view at B-B in fig. 9.

FIG. 11 is a schematic structural view of a valve stem according to an embodiment of the present utility model.

Fig. 12 is a schematic structural view of a guide block according to an embodiment of the present utility model.

Fig. 13 is a schematic structural view of a guide holder according to an embodiment of the present utility model.

Fig. 14 is a schematic structural view of a guide holder according to an embodiment of the present utility model.

Fig. 15 is a cross-sectional view of a guide housing according to an embodiment of the present utility model.

Fig. 16 is a schematic structural view of a valve seat according to an embodiment of the present utility model.

Fig. 17 is a cross-sectional view at C-C in fig. 16.

Reference numerals: the electronic expansion valve 1, the valve seat assembly 10,

the valve seat 12, the receiving groove 122, the valve port 131,

the sleeve 17, the needle assembly 20, the first portion 201, the second portion 202, the third portion 203, the stem 21, the guide surface 211, the first step 212, the first stop surface 215, the second stop surface 216,

the valve needle 22, the accommodation chamber 221, the communication hole 223, the second stopper 23, the first mating surface 231, the second mating surface 232,

guide holder 30, moving chamber 31, first stop 311, manufacturing hole 39, guide block 41, elastic member 44,

a transition piece 50.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

An electronic expansion valve 1 according to an embodiment of the present utility model is described below with reference to the drawings.

In the related art, the valve needle and the rotating part stop to determine the axial position of the valve needle in the fully opened state of the electronic expansion valve, and the axial position of the valve needle cannot be precisely controlled due to the rotation of the rotating part, so that the fully opened state of the electronic expansion valve cannot be precisely controlled. It is understood that the fully open state of the electronic expansion valve refers to the state of the electronic expansion valve when the valve needle is moved in the axial direction away from the valve port by a maximum displacement.

As shown in fig. 2, 4, and 5, the electronic expansion valve 1 according to the embodiment of the present utility model includes a valve seat assembly 10, a needle assembly 20, and a switching member 50.

The valve seat assembly 10 is provided with a valve port 131, and the switching member 50 cooperates with the valve needle assembly 20 such that rotation of the switching member 50 is converted into reciprocal movement of the valve needle assembly 20, and the valve needle assembly 20 is reciprocally movably provided to the valve seat assembly 10 to open or close the valve port 131.

Wherein, the valve seat assembly 10 is provided with a first stopping portion 311, the valve needle assembly 20 is suitable for stopping with the first stopping portion 311 to limit the movement displacement of the valve needle assembly 20, and when the valve needle assembly 20 is stopped with the first stopping portion 311, the valve needle assembly 20 stops moving so as to control the degree of opening or closing the valve port 131 of the valve needle assembly 20.

Specifically, since the first stopper 311 is disposed on the valve seat assembly 10, the first stopper 311 is stationary with respect to the valve seat assembly 10, and when the valve needle assembly 20 abuts against the first stopper 311, the first stopper 311 is made stationary, and the valve needle assembly 20 abuts against the first stopper 311 to stop the movement, so that the axial position of the valve needle assembly 20 is precisely controlled, and thus the fully opened state of the electronic expansion valve 1 is precisely controlled, while the wear to which the valve needle assembly 20 is subjected is reduced, as compared with the case where the valve needle assembly 20 abuts against a component part rotating in the electronic expansion valve 1 to stop the movement.

According to the electronic expansion valve 1 of the embodiment of the utility model, by limiting the movement range of the valve needle assembly 20 by the first stopper 311, when the valve needle assembly 20 abuts against the first stopper 311, since the first stopper 311 is stationary relative to the valve seat assembly 10, the axial position when the valve needle assembly 20 abuts against the first stopper 311 can be accurately controlled, while reducing wear to which the valve needle assembly 20 is subjected.

An electronic expansion valve 1 according to an embodiment of the present utility model is described below with reference to the accompanying drawings.

As shown in fig. 2, 4, and 5, the electronic expansion valve 1 according to the embodiment of the present utility model includes a valve seat assembly 10, a needle assembly 20, and a switching member 50.

In some embodiments of the present utility model, the electronic expansion valve 1 further comprises a guide block 41, the guide block 41 being fixed to the valve needle assembly 20, the valve seat assembly 10 comprising a guide seat 30, the guide seat 30 being mounted within the valve seat assembly 10, the guide block 41 cooperating with the guide seat 30 to limit the rotational freedom of the valve needle assembly 20.

Since the guide block 41 is fixed on the valve needle assembly 20, the rotational degree of freedom of the guide block 41 can be limited by limiting the rotational degree of freedom of the valve needle assembly 20, when the valve needle assembly 20 opens or closes the valve port 131, compared with the valve needle assembly 20 which rotates and moves to close the valve port 131, the valve needle assembly 20 only reciprocates in the valve seat assembly 10 without rotating relative to the valve needle assembly 20, so that abrasion between the valve needle assembly 20 and the valve seat assembly 10 is reduced, and noise generated between the valve needle assembly 20 and the valve seat assembly 10 is reduced.

In some embodiments of the present utility model, the guide holder 30 is provided with a moving cavity 31, the guide block 41 is reciprocally disposed in the moving cavity 31, and the guide block 41 can only move in the moving cavity 31 but cannot rotate in the moving cavity 31. Wherein, the side of the moving cavity 31 facing away from the valve port 131 is provided with a first stop portion 311, and the first stop portion 311 is adapted to cooperate with the guide block 41 to limit the moving displacement of the guide block 41, and limit the moving displacement range of the valve needle assembly 20 by limiting the moving displacement range of the guide block 41, so as to control the degree of the valve needle assembly 20 completely opening the valve port 131.

Specifically, when the needle assembly 20 moves in a direction away from the valve port 131 to open the valve port 131, the needle assembly 20 is not moving further when the guide block 41 is engaged with the first stopper 311, and the needle assembly 20 fully opens the valve port 131.

In addition, since the guide holder 30 is fixed in the valve seat assembly 10, the guide holder 30 is fixed, and the valve needle assembly 20 only moves in the moving cavity 31 without rotating under the restriction of the guide holder 30, so that only relative movement between the first stopper 311 and the guide block 41 does not occur when the valve needle assembly 20 moves to open the valve port 131, and thus friction between the first stopper 311 and the guide block 41 is small and rotational friction does not occur when the first stopper 311 is matched with the guide block 41, thereby facilitating reduction of noise generated in the electronic expansion valve 1.

In some alternative embodiments of the present utility model, the outer peripheral wall of the guide block 41 in a cross section along the radial direction of the needle assembly 20 is formed in a non-circular shape, and at least a portion of the inner wall of the moving chamber 31 is formed in a non-circular shape to be engaged with the guide block 41 so that the inner wall of the moving chamber 31 has a rotation stopping force against the rotation of the guide block 41 when the guide block 41 has a rotation tendency, so that the guide block 41 does not rotate in the moving chamber 31, and thus the rotation of the needle assembly 20 is restricted by the guide block 41, so that the needle assembly 20 does not rotate in the valve seat assembly 10, thus facilitating the reduction of wear between the needle assembly 20 and the valve seat assembly 10.

In some embodiments, the outer peripheral wall of the guide block 41 is slidably engaged with at least a portion of the inner wall of the moving cavity 31, and when the valve needle assembly 20 reciprocates, the guide block 41 reciprocates together with the valve needle assembly 20, and at this time, the inner wall of the moving cavity 31 can guide the moving direction of the guide block 41, so that the guide block 41 can smoothly reciprocate in the moving cavity 31, and further guide the movement of the valve needle assembly 20, so that the valve needle assembly 20 can smoothly open or close the valve port 131.

In some examples, as shown in fig. 12 and 13, the outer peripheral wall of the guide block 41 is formed in an oblong shape, and at least a portion of the inner wall of the moving chamber 31 is formed in an oblong shape to be in a rotation-stopping engagement with the guide block 41, and when the guide block 41 has a tendency to rotate, the inner wall of the moving chamber 31 has a rotation-stopping force against the outer peripheral wall of the guide block 41 to restrict the rotation of the guide block 41, so that the guide block 41 can only reciprocate in the moving chamber 31 without rotation, so that the needle assembly 20 can only reciprocate without rotation, and further, when the needle assembly 20 reciprocates to open or close the valve port 131, friction between the needle assembly 20 and the valve seat assembly 10 can be reduced, thereby reducing wear between the needle assembly 20 and the valve seat assembly 10.

In other examples, the outer peripheral wall of the guide block 41 may be formed in a triangle, square, hexagon, etc., and at least a portion of the inner wall of the movement chamber 31 within the guide holder 30 is correspondingly formed in a triangle, square, hexagon, etc. to be in a non-rotational fit with the guide block 41.

In still other embodiments, the outer peripheral wall of the guide block 41 is provided with one of a guide groove and a guide protrusion, the inner wall of the moving chamber 31 is provided with the other of the guide protrusion and the guide groove, and the guide protrusion extends into the guide groove and can slide in the guide groove to guide the moving direction of the guide block 41 by using the cooperation of the guide protrusion and the guide groove, and simultaneously when the guide block 41 has a rotating tendency, the rotation of the guide block 41 is limited by using the cooperation of the guide protrusion and the guide groove, and further the rotation of the valve needle assembly 20 is limited.

For example, the outer peripheral wall of the guide block 41 is provided with a guide groove, the inner wall of the moving cavity 31 is provided with a guide protrusion, the guide groove and the guide protrusion extend along the up-down direction, when the valve needle assembly 20 moves along the up-down direction, the guide groove slides along the up-down direction, and the guide protrusion slides along the up-down direction in the guide groove to limit the moving direction of the guide block 41, and further limit the moving direction of the valve needle assembly 20, so that the valve needle assembly 20 can smoothly reciprocate along the up-down direction, and the valve needle assembly 20 can smoothly open or close the valve port 131.

Meanwhile, when the valve needle assembly 20 has a tendency to rotate, since the guide protrusion extends into the guide groove, the guide seat 30 is fixed on the valve seat assembly 10, and therefore the side wall of the guide groove has a rotation stopping force on the guide protrusion so as to limit the rotation of the guide block 41, so that the guide block 41 and the valve needle assembly 20 can only reciprocate up and down and cannot rotate, and further, when the valve needle assembly 20 reciprocates, the friction between the valve needle assembly 20 and the valve seat assembly 10 can be reduced when the valve needle assembly 20 opens or closes the valve port 131, and further, the abrasion between the valve needle assembly 20 and the valve seat assembly 10 is reduced, and meanwhile, the noise generated in the electronic expansion valve 1 is conveniently reduced.

In some embodiments of the present utility model, as shown in fig. 13, a plurality of manufacturing holes 39 are formed on the guide holder 30 to facilitate injection molding of the guide holder 30, specifically, the guide holder 30 defines a moving cavity 31, the moving cavity 31 extends in an up-down direction, the wall thickness of the guide holder 30 is thicker in a radial direction of the moving cavity 31, and the manufacturing holes 39 extend in the up-down direction, so as to reduce the wall thickness of the guide holder 30, and further reduce the possibility of deformation of the peripheral wall of the guide holder 30 when injection molding the guide holder 30.

In some embodiments of the present utility model, as shown in fig. 8-11, the valve needle assembly 20 includes a valve stem 21, a valve needle 22, and an elastic member 44, where the elastic member 44 is respectively connected to the valve stem 21 and the valve needle 22, and the elastic member 44 applies a force toward the valve needle 22 with a tendency to move away from the valve stem 21, so as to increase the force between the valve needle 22 and the valve port 131 when the valve needle 22 closes the valve port 131, so that the valve needle 22 can sufficiently close the valve port 131, reducing the possibility of leakage of the liquid when the valve port 131 is closed by the electronic expansion valve 1, and facilitating improvement of the yield of the electronic expansion valve 1.

The valve rod 21 is provided with a first stopping surface 215 and a second stopping surface 216, the first stopping surface 215 and the second stopping surface 216 are arranged at intervals in the moving direction of the valve rod 21, the valve needle 22 is provided with a second stopping member 23, at least a part of the second stopping member 23 is positioned between the first stopping surface 215 and the second stopping surface 216, the valve needle 22 can move relative to the valve rod 21 so that the second stopping member 23 can be in stopping contact with the first stopping surface 215 and the second stopping surface 216 in a switching manner, the moving range of the valve needle 22 relative to the valve rod 21 is controlled by utilizing the first stopping surface 215 and the second stopping surface 216, and as the elastic member 44 is respectively connected with the valve rod 21 and the valve needle 22, the compression amount of the elastic member 44 compressed can be controlled by controlling the moving range of the valve needle 22 relative to the valve rod 21, and the acting force of the elastic member 44 to the valve needle 22 is further controlled, so that the valve needle 22 can be fully closed, and the failure of the elastic member 44 is avoided.

In some alternative embodiments of the utility model, as shown in fig. 11, the valve stem 21 includes a first portion 201 and a second portion 202, the first portion 201 being located on a side of the second portion 202 facing the valve needle 22, the first portion 201 having a larger diameter than the second portion 202, an end surface of the first portion 201 beyond the second portion 202 defining a first stop surface 215, and the valve needle 22 and the valve stem 21 no longer continuing to move relative to each other as the distance between the second stop 23 and the first stop surface 215 decreases and is in abutting engagement.

As shown in fig. 4, 10 and 11, in the present embodiment, the valve needle assembly 20 moves in the up-down direction to open or close the valve port 131, the first stop surface 215 is located below the second stop surface 216, the second stop member 23 includes a first engagement surface 231 and a second engagement surface 232, the first engagement surface 231 is located below the second engagement surface 232, the second engagement surface 232 is in abutting engagement with the second stop surface 216 when the valve needle assembly 20 closes the valve port 131, and the first engagement surface 231 is in abutting engagement with the first stop surface 215 when the valve needle assembly 20 opens the valve port 131.

Wherein the first portion 201 is formed as a first cylinder, the second portion 202 is formed as a second cylinder, at least a portion of the second stopper 23 is sleeved on the second portion 202, and a distance between the first mating surface 231 and the second mating surface 232 in the up-down direction is smaller than a length of the second portion 202, so that the second stopper 23 can move in the up-down direction on the second portion 202.

When the valve needle assembly 20 opens the valve port 131, the valve rod 21 moves upwards, the valve needle 22 moves downwards relative to the valve rod 21, the second stop piece 23 moves downwards, the first matching surface 231 is in stop fit with the first stop surface 215, and the valve rod 21 drives the valve needle 22 to move upwards through the first stop surface 215, so that the valve needle 22 can smoothly open the valve port 131.

When the valve needle assembly 20 closes the valve port 131, the valve rod 21 moves downward, at this time, the valve needle 22 moves upward relative to the valve rod 21, the stop portion 23 moves upward and the second mating surface 232 is in abutting engagement with the second stop surface 216, at this time, the valve rod 21 drives the valve needle 22 to move downward through the second stop surface 216, so that the valve needle 22 can smoothly close the valve port 131.

In some alternative embodiments of the utility model, as shown in fig. 10, the end of the guide block 41 facing the first stop surface 215 defines a second stop surface 216, and the valve needle 22 and the valve stem 21 do not continue to move relative to each other as the distance between the second stop 23 and the second stop surface 216 gradually decreases and stops against the engagement as the valve stem 21 and the valve needle 22 move relative to each other.

As shown in fig. 10, in the present embodiment, the valve needle assembly 20 moves in the up-down direction to open or close the valve port 131, the guide block 41 is disposed above the second portion 202, the first stop surface 215 is disposed below the second stop surface 216, the second stop member 23 is sleeved on the second portion 202, the second stop member 23 is disposed below the guide block 41, the second stop member 23 includes a first mating surface 231 and a second mating surface 232, the first mating surface 231 is disposed below the second mating surface 232, the second mating surface 232 is in abutting engagement with the second stop surface 216 when the valve needle assembly 20 closes the valve port 131, and the first mating surface 231 is in abutting engagement with the first stop surface 215 when the valve needle assembly 20 opens the valve port 131.

When the valve needle assembly 20 opens the valve port 131, the valve rod 21 moves upwards, the valve needle 22 moves downwards relative to the valve rod 21, the second stop piece 23 moves downwards, the first matching surface 231 is in stop fit with the first stop surface 215, and the valve rod 21 drives the valve needle 22 to move upwards through the first stop surface 215, so that the valve needle 22 can smoothly open the valve port 131.

When the valve needle assembly 20 closes the valve port 131, the valve rod 21 moves downward, at this time, the valve needle 22 moves upward relative to the valve rod 21, the second stopper 23 moves upward, and the second mating surface 232 is in abutting engagement with the second stopper surface 216, at this time, the valve rod 21 can drive the valve needle 22 to move downward, so that the valve needle 22 can smoothly close the valve port 131.

In some embodiments of the present utility model, as shown in fig. 11, the valve stem 21 further includes a third portion 203, the third portion 203 is connected to the second portion 202, the diameter of the second portion 202 is larger than that of the third portion 203, the guide block 41 is sleeved on the third portion 203 and abuts against the second portion 202, so as to limit the position of the guide block 41 on the valve stem 21, so as to fix the guide block 41 at a designated position on the valve stem 21, limit the rotation of the valve stem 21 by using the cooperation of the guide block 41 and the guide seat 30, limit the movement range of the valve stem 21 by using the cooperation of the guide block 41 and the first stop portion 311, and limit the movement range of the valve needle 22, so as to control the degree of opening the valve port 131 of the valve needle 22.

In some embodiments, as shown in fig. 11, the valve rod 21 further includes a guide surface 211, where the guide surface 211 is located on a side of the third portion 203 facing away from the second portion 202, and the guide surface 211 extends obliquely toward the third portion 203 for guiding the installation of the guide block 41, so that the guide block 41 can be smoothly sleeved on the third portion 203, so that the guide block 41 is fixedly matched with the third portion 203, and the guide block 41 is further fixed on the valve rod 21, so that the rotation of the valve rod 21 can be limited by using the matching of the guide block 41 and the guide seat 30, the movement range of the valve rod 21 can be limited by using the matching of the guide block 41 and the first stop portion 311, and the movement range of the valve needle 22 can be limited, so as to control the degree of opening the valve port 131 of the valve needle 22.

As shown in fig. 11, in the present embodiment, the second portion 202 is formed as a second cylinder, the third portion 203 is formed as a third cylinder, the diameter of the second portion 202 is larger than that of the third portion 203, the end surface of the second portion 202 beyond the third portion 203 defines a first step 212, the guide block 41 is located between the guide surface 211 and the first step 212, the guide block 41 is in interference fit with the third portion 203 to define the position of the guide block 41 on the valve rod 21, and when the valve rod 21 reciprocates, the valve rod 21 can drive the guide block 41 to reciprocate, so that the valve rod 21 is prevented from being disengaged from the guide block 41 when the valve rod 21 reciprocates, and further, the rotation of the valve rod 21 is limited by the cooperation of the guide block 41 and the guide seat 30, and the movement displacement of the valve rod 21 is limited.

In some alternative embodiments of the present utility model, as shown in fig. 10, a receiving cavity 221 is disposed in the valve needle 22, and an elastic member 44 is disposed in the receiving cavity 221, when the valve needle 22 seals the valve port 131, the elastic member 44 has a force towards the valve port 131 on the valve needle 22, so as to increase the force between the valve needle 22 and the valve port 131, so that the valve needle 22 can fully seal the valve port 131, reduce the possibility of liquid leakage of the electronic expansion valve 1 when the valve port 131 is closed, and facilitate improvement of the qualification rate of the electronic expansion valve 1.

In some embodiments, as shown in fig. 10, the elastic member 44 extends in the up-down direction (it should be understood that the above direction limitation is only for convenience of description of the drawings, and does not limit the actual setting position and direction of the electronic expansion valve 1), when the valve needle 22 seals the valve port 131, the elastic member 44 has a downward force on the valve needle 22, so that the valve needle 22 can fully seal the valve port 131, and the possibility of leakage of the electronic expansion valve 1 when the valve port 131 is closed is reduced, so as to facilitate improvement of the qualification rate of the electronic expansion valve 1.

In some embodiments, as shown in fig. 10, the lower end of the valve stem 21 protrudes into the accommodating chamber 221 and is movable within the accommodating chamber 221 a certain distance to compress the elastic member 44 in the accommodating chamber 221, so that the elastic member 44 has a force on the valve needle 22 toward the valve port 131.

When the valve needle assembly 20 closes the valve port 131, the valve rod 21 and the guide block 41 move downwards relative to the valve needle 22, the second stop surface 216 is in stop fit with the second matching surface 232, the valve rod 21 can drive the valve needle 22 to move downwards so that the valve needle 22 can block the valve port 131, and meanwhile, the valve rod 21 compresses the elastic piece 44 in the accommodating cavity 221, so that the elastic piece 44 has acting force towards the valve port 131 on the valve needle 22, and the valve needle 22 can fully block the valve port 131.

Specifically, the second stop surface 216 is in abutting engagement with the second mating surface 232, so as to control the length of the valve rod 21 extending into the accommodating cavity 221, and further control the compression amount of the valve rod 21 on the elastic member 44, so as to avoid failure of the elastic member 44.

When the valve rod 21 and the guide block 41 move upwards relative to the valve needle 22, the lower end of the second stop piece 23 is in stop fit with the first stop surface 215, so that the valve needle 22 is driven to move upwards by driving the second stop piece 23 to move upwards, and the valve needle 22 can smoothly open the valve port 131.

In some embodiments of the present utility model, as shown in fig. 8, the sidewall of the accommodating cavity 221 is provided with a communication hole 223, the communication hole 223 penetrates through the sidewall of the accommodating cavity 221, and the communication hole 223 is used for balancing the air pressure inside and outside the accommodating cavity 221, so that when the valve rod 21 compresses the elastic member 44 in the accommodating cavity 221, the air pressure in the accommodating cavity 221 is prevented from being compressed, and thus the resistance of the valve rod 21 when compressing the elastic member 44 is reduced.

In addition, when the valve needle assembly 20 opens the valve port 131, external refrigerant enters the electronic expansion valve 1 and flows out of the valve port 131, and the refrigerant entering the electronic expansion valve 1 can enter the accommodating chamber 221 from the communication hole 223 to lubricate the spring member in the accommodating chamber 221, and the refrigerant in the accommodating chamber 221 can flow into the valve seat assembly 10 to lubricate the parts in the valve seat assembly 10, thereby reducing the abrasion among the parts.

A thermal management system according to an embodiment of the present utility model is described below. The thermal management system according to the embodiment of the present utility model includes the electronic expansion valve 1 according to the above-described embodiment of the present utility model.

According to the thermal management system of the embodiment of the present utility model, by using the electronic expansion valve 1 according to the above-described embodiment of the present utility model, by restricting the movement range of the needle assembly 20 by the first stopper 311, when the needle assembly 20 abuts against the first stopper 311, since the first stopper 311 is stationary with respect to the valve seat assembly 10, the relative displacement between the first stopper 311 and the needle assembly 20 can be reduced, thereby facilitating the reduction of wear to which the needle assembly 20 is subjected.

A vehicle according to an embodiment of the present utility model is described below. A vehicle according to an embodiment of the present utility model includes a thermal management system according to the above-described embodiment of the present utility model.

According to the vehicle of the embodiment of the present utility model, by using the thermal management system according to the above-described embodiment of the present utility model, by restricting the movement range of the needle assembly 20 by the first stopper 311, when the needle assembly 20 abuts against the first stopper 311, since the first stopper 311 is stationary with respect to the valve seat assembly 10, the relative displacement between the first stopper 311 and the needle assembly 20 can be reduced, thereby facilitating the reduction of wear to which the needle assembly 20 is subjected.

Other components and operations of a vehicle according to embodiments of the utility model are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present utility model, 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", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more. In the description of the utility model, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by another feature therebetween.

In the description of the utility model, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (13)

1. An electronic expansion valve (1), characterized by comprising:

a valve seat assembly (10), the valve seat assembly (10) being provided with a valve port (131);

a needle assembly (20), the needle assembly (20) being reciprocally movably provided to the valve seat assembly (10) to open or close the valve port (131);

-a transition piece (50), said transition piece (50) cooperating with said valve needle assembly (20) such that rotation of said transition piece (50) is translated into reciprocal movement of said valve needle assembly (20);

the valve seat assembly (10) is provided with a first stop (311), and the valve needle assembly (20) is suitable for stopping with the first stop (311) to limit the movement displacement of the valve needle assembly (20).

2. The electronic expansion valve (1) according to claim 1, further comprising:

-a guide block (41), the guide block (41) being fixed to the valve needle assembly (20);

the valve seat assembly (10) comprises a guide seat (30), and the guide seat (30) is installed in the valve seat assembly (10);

the guide block (41) cooperates with the guide seat (30) to limit the rotational freedom of the valve needle assembly (20).

3. Electronic expansion valve (1) according to claim 2, wherein the guide holder (30) is provided with a moving cavity (31), the guide block (41) is reciprocally disposed in the moving cavity (31), one side of the moving cavity (31) facing away from the valve port (131) is provided with the first stop portion (311), and the first stop portion (311) is adapted to cooperate with the guide block (41) to limit the moving displacement of the guide block (41).

4. An electronic expansion valve (1) according to claim 3, characterized in that the outer peripheral wall of the guide block (41) in a cross section in the radial direction of the needle assembly is formed in a non-circular shape, and at least a part of the inner wall of the moving chamber (31) is formed in a non-circular shape to be fitted with the guide block (41).

5. The electronic expansion valve (1) according to claim 2, wherein the valve needle assembly (20) comprises:

a valve rod (21), wherein the valve rod (21) is provided with a first stop surface (215) and a second stop surface (216), and the first stop surface (215) and the second stop surface (216) are arranged at intervals in the moving direction of the valve rod (21);

-a valve needle (22), the valve needle (22) being provided with a second stop (23), at least a portion of the second stop (23) being located between the first stop surface (215) and the second stop surface (216), the valve needle (22) being movable relative to the valve stem (21) such that the second stop (23) is in switching abutment with the first stop surface (215) and the second stop surface (216);

and the elastic piece (44) is respectively connected with the valve rod (21) and the valve needle (22), and the elastic piece (44) applies a force towards the valve needle (22) and a force away from the valve rod (21).

6. The electronic expansion valve (1) according to claim 5, wherein the valve stem (21) comprises a first portion (201) and a second portion (202), the first portion (201) being located on a side of the second portion (202) facing the valve needle (22), the first portion (201) having a larger diameter than the second portion (202), an end surface of the first portion (201) beyond the second portion (202) defining the first stop surface (215).

7. The electronic expansion valve (1) according to claim 6, characterized in that an end face of the guide block (41) facing the first stop surface (215) defines the second stop surface (216).

8. The electronic expansion valve (1) according to claim 7, wherein the valve stem (21) further comprises a third portion (203), the third portion (203) being connected to the second portion (202), the second portion (202) having a diameter larger than the diameter of the third portion (203), the guide block (41) being sheathed on the third portion (203) and abutting against the second portion (202).

9. Electronic expansion valve (1) according to claim 8, characterized in that the valve stem (21) also has a guide surface (211), which guide surface (211) is located on the side of the third part (203) facing away from the second part (202), which guide surface (211) extends obliquely towards the third part (203) for guiding the mounting of the guide block (41).

10. Electronic expansion valve (1) according to claim 5, characterized in that the valve needle (22) is provided with a receiving cavity (221), and the elastic member (44) is arranged in the receiving cavity (221).

11. The electronic expansion valve (1) according to claim 10, wherein the side wall of the accommodation chamber (221) has a communication hole (223) penetrating the side wall.

12. Thermal management system, characterized in that it comprises an electronic expansion valve (1) according to any one of claims 1-11.

13. A vehicle comprising the thermal management system of claim 12.