CN220792098U - Electronic expansion valve, thermal management system with electronic expansion valve and vehicle - Google Patents

Abstract

The utility model discloses an electronic expansion valve, a thermal management system and a vehicle with the electronic expansion valve, wherein the electronic expansion valve comprises: the valve body is used for limiting an installation cavity and a valve port communicated with the installation cavity; the valve needle assembly is arranged in the mounting cavity in a reciprocating manner and comprises a valve rod and a valve needle, the valve rod is connected with the valve needle to drive the valve needle to reciprocate, and the valve needle is used for opening or closing the valve port; and the blocking assembly is arranged in the mounting cavity and matched with the valve rod to limit the movement displacement of the valve rod in the first direction and the second direction, and the directions of the first direction and the second direction are opposite. According to the electronic expansion valve provided by the embodiment of the utility model, the blocking component is arranged on the valve body, and the blocking component is utilized to limit the movable range of the valve needle component, so that the valve needle component can accurately and smoothly open or close the valve port, and the precision of opening or closing the valve port of the valve needle component is conveniently improved.

Description

Electronic expansion valve, thermal management system with electronic expansion valve 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 with the electronic expansion valve and a vehicle.

Background

In the related art, a valve needle assembly in an electronic expansion valve moves to open or close a valve port, and the movement and the stop of the valve needle assembly are controlled by a motor, so that the valve opening precision and the valve closing precision of the valve needle assembly are poor.

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, and the blocking component is arranged on the valve body, so that the blocking component is utilized to limit the movable range of the valve needle component, the valve needle component can accurately and smoothly open or close the valve port, and the precision of opening or closing the valve port of the valve needle component is conveniently improved.

The utility model further 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: a valve body defining an installation cavity and a valve port in communication with the installation cavity; the valve needle assembly is arranged in the mounting cavity in a reciprocating manner and comprises a valve rod and a valve needle, the valve rod is connected with the valve needle to drive the valve needle to reciprocate, and the valve needle is used for opening or closing the valve port; and the blocking assembly is arranged in the mounting cavity and matched with the valve rod to limit the movement displacement of the valve rod in a first direction and a second direction, and the first direction is opposite to the second direction.

According to the electronic expansion valve provided by the embodiment of the utility model, the blocking component is arranged on the valve body, and the blocking component is utilized to limit the movable range of the valve needle component, so that the valve needle component can accurately and smoothly open or close the valve port, and the precision of opening or closing the valve port of the valve needle component is conveniently improved.

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 blocking assembly includes a first stop disposed on a side of the valve stem facing away from the valve port to limit displacement movement of the valve stem in the first direction.

According to some alternative embodiments of the utility model, the first stop is provided with a first guide and the valve stem is provided with a second guide, the first guide and the second guide cooperating to guide movement of the valve stem.

In some embodiments, the first guide is a first guide slot and the end of the valve stem facing away from the valve port defines the second guide and is in sliding engagement with the first guide slot.

According to some alternative embodiments of the utility model, the valve body comprises: a valve seat defining a mounting cavity having an upper opening; the valve cover is used for closing the upper opening, and the first stop piece is arranged on the valve cover.

According to some embodiments of the utility model, the blocking assembly includes a second stop provided to the valve needle, the second stop being located on a side of the valve stem adjacent the valve port to limit the movement displacement of the valve stem in the second direction.

According to some alternative embodiments of the utility model, the second stopper and the valve needle are an integral piece.

According to some embodiments of the utility model, the valve needle assembly further comprises an elastic member connected to the valve stem and the valve needle, respectively, the valve stem being movable toward the valve port to compress the elastic member to form a preload force when the valve needle closes the valve port.

In some embodiments, a receiving cavity is provided in the valve needle, and the elastic member is provided in the receiving cavity.

In some embodiments, the valve needle assembly further comprises a pressure jacket for sealing an opening of the receiving cavity facing away from the valve port.

According to some alternative embodiments of the utility model, the electronic expansion valve further comprises a fitting secured to the valve body, the valve stem having a first fitting portion, the fitting being provided with a second fitting portion, the first and second fitting portions cooperating to limit the rotational freedom of the valve stem.

In some embodiments, the outer peripheral wall of the first mating portion is non-circular in cross-section, the second mating portion is formed as a non-circular mating hole into which the first mating portion extends.

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 the thermal management system of the embodiment of the utility model, the electronic expansion valve according to the embodiment of the first aspect of the utility model is utilized, and the blocking component is arranged on the valve body, so that the blocking component is utilized to limit the movable range of the valve needle component, the valve needle component can accurately and smoothly open or close the valve port, and the precision of the valve needle component for opening or closing the valve port is convenient to improve.

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

According to the vehicle disclosed by the embodiment of the utility model, the thermal management system disclosed by the embodiment of the second aspect of the utility model is utilized, and the blocking component is arranged on the valve body, so that the blocking component is utilized to limit the movable range of the valve needle component, the valve needle component can accurately and smoothly open or close the valve port, and the precision of opening or closing the valve port by the valve needle component is conveniently improved.

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 an enlarged view at a in fig. 1.

Fig. 3 is a schematic structural view of a valve needle assembly according to an embodiment of the present utility model.

Fig. 4 is a schematic structural view of a valve stem according to an embodiment of the present utility model.

Fig. 5 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. 6 is a schematic view of the structure of the fitting in one direction according to the embodiment of the present utility model.

Fig. 7 is a schematic view of the fitting in another direction according to an embodiment of the present utility model.

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

Reference numerals: the electronic expansion valve 1 is provided with a valve,

the valve body 10, the valve seat 101, the valve cover 102, the installation cavity 103,

the first chamber 111, the second chamber 112, the valve port 12,

a guide passage 131, a communication passage 132, a stepped portion 133, a liquid inlet 14,

The valve needle assembly 20, the second guide 201,

the valve stem 21, the first mating portion 211, the first limiting surface 2111, the stopper 212, the first cambered surface 2121, the second cambered surface 2122, the first flat surface 2123, the second flat surface 2124,

the valve needle 22, the accommodation chamber 221, the gas hole 2211, the guide portion 223, the blocking portion 224, the air flow passage 2241, the elastic member 23,

the rotation member 30, the fitting space 301,

the engaging member 40, the second engaging portion 41, the second limiting surface 411, the balance hole 42, the mounting groove 43, the support step 44,

retainer ring 61, mating bearing 62, fixture 63, flow holes 631, seal 64,

the first stopper 71, the first guide 711, the second stopper 72, and the press sleeve 73.

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.

As shown in fig. 1 and 2, an electronic expansion valve 1 according to an embodiment of the present utility model includes a valve body 10, a needle assembly 20, and a blocking assembly.

The valve body 10 defines a mounting cavity 103 and a valve port 12, the valve port 12 is communicated with the mounting cavity 103, the valve needle assembly 40 is arranged in the mounting cavity 103 in a reciprocating manner, the valve needle assembly 40 comprises a valve rod 21 and a valve needle 22, the valve rod 21 is connected with the valve needle 22 to drive the valve needle 22 to reciprocate, and the valve needle 22 is used for opening or closing the valve port 13.

The blocking component is arranged in the mounting cavity 103, and is matched with the valve rod 21 to limit the movement displacement of the valve rod 21 in the first direction and the second direction, and the first direction is opposite to the second direction, so that the movable range of the valve rod 21 in the mounting cavity 103 along the first direction and the second direction is limited, and the valve rod 21 can drive the valve needle 22 to smoothly open or close the valve port 12.

Specifically, when the valve rod 21 and the blocking component are matched, the valve rod 21 stops moving and drives the valve needle 22 to stop moving, and at the moment, the valve needle 22 fully closes the valve port 12 or opens the valve port 12, the blocking component is used for limiting the degree of opening or closing the valve port 12 of the valve needle 22, so that the valve needle 22 can accurately open or close the valve port 12, the working stability of the valve needle component 20 is conveniently ensured, and the precision of opening or closing the valve port 12 of the valve needle 22 is conveniently improved.

For example, when the valve rod 21 drives the valve needle 22 to move along the first direction, when the valve rod 21 is matched with the blocking component, the valve rod 21 stops moving and drives the valve needle 22 to stop moving, at the moment, the valve needle 22 completely opens the valve port 12, when the valve rod 21 drives the valve needle 22 to move along the second direction, and when the valve rod 21 is matched with the blocking component, the valve rod 21 stops moving and drives the valve needle 22 to stop moving, at the moment, the valve needle 22 completely closes the valve port 12.

Therefore, in the electronic expansion valve 1 according to the embodiment of the present utility model, by providing the blocking component on the valve body 10, the movable range of the valve needle component 20 is limited by using the blocking component, so that the valve needle component 20 can accurately and smoothly open or close the valve port 12, and the precision of opening the valve port 12 or closing the valve port 12 by the valve needle component 20 is convenient to improve.

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. 1 and 2, an electronic expansion valve 1 according to an embodiment of the present utility model includes a valve body 10, a needle assembly 20, and a blocking assembly.

In some embodiments of the present utility model, as shown in fig. 1, the blocking assembly includes a first stopper 71, where the first stopper 71 is disposed on a side of the valve stem 21 away from the valve port 12 to limit the movement displacement of the valve stem 21 in a first direction, specifically, the direction of the valve stem 21 away from the valve port 12, when the valve stem 21 moves in the first direction in the mounting cavity 103 in a direction away from the valve port 12, the valve stem 21 does not move further when the valve stem 21 is in abutting engagement with the first stopper 71, and the valve stem 21 drives the valve needle 22 to fully open the valve port 12.

In some embodiments, as shown in fig. 1, the first direction is an upward direction, the second direction is a downward direction, and the valve rod 21 can reciprocate in the up-down direction, where it is to be understood that the above direction limitation is merely for convenience of description of the drawings, and no limitation is made on the actual setting position and direction of the electronic expansion valve 1, and when the valve rod 21 moves upward and drives the valve needle 22 to move upward, the valve needle 22 opens the valve port 12, and when the valve rod 21 is in abutting engagement with the first stopper 71, the valve rod 21 and the valve needle 22 do not move further upward.

That is, by providing the first stopper 71, the range of upward movement of the valve stem 21 and the needle 22 in the up-down direction can be restricted so that the needle 22 can sufficiently open the valve port 12 without excessively moving upward, so that the range of upward movement of the valve stem 21 and the needle 22 can be precisely controlled, ensuring that the needle 22 can sufficiently open the valve port 12 when the valve stem 21 stops with the first stopper 71 and stops moving upward on the one hand, and on the other hand, facilitating shortening the path of reciprocal movement of the valve stem 21 and the needle 22 in the installation chamber 103.

In some alternative embodiments of the present utility model, as shown in fig. 4 and 8, the first stopper 71 is provided with a first guide portion 711, and the valve stem 21 is provided with a second guide portion 201, and the first guide portion 711 and the second guide portion 201 cooperate to guide movement of the valve stem 21, thereby facilitating improvement of stability of movement of the valve stem 21 within the mounting cavity 103 when the valve stem 21 reciprocates.

Specifically, when the valve rod 21 moves in the installation cavity 103, the first guiding portion 711 and the second guiding portion 201 cooperate to guide the moving direction of the valve rod 21 in the installation cavity 103, so that shake generated when the valve rod 21 moves can be reduced, and the valve rod 21 can drive the valve needle 22 to open or close the valve port 12 smoothly.

Meanwhile, by reducing the shaking of the valve rod 21 during movement, the collision between the valve rod 21 and the valve body 10 during movement is reduced, and the shaking of the valve needle assembly 20 during movement is reduced, so that the noise generated in the electronic expansion valve 1 is reduced. In addition, through reducing the collision between the valve needle assembly 20 and the valve body 10 when moving, the valve needle assembly 20 is prevented from jumping after being acted by the valve body 10, so that the number of times of collision between the valve needle assembly 20 and the valve body 10 is further reduced, and noise generated in the electronic expansion valve 1 is reduced.

In some embodiments of the present utility model, as shown in fig. 8, the first guide portion 711 is a first guide groove, the end of the valve stem 21 facing away from the valve port 12 defines a second guide portion 201, the second guide portion 201 is slidably engaged with the first guide groove, and the inner wall of the first guide groove is adapted to contact the outer circumferential wall of the second guide portion 201 to limit the movement of the valve needle assembly 20, and when the valve needle assembly 20 reciprocates, the second guide portion 201 can slide along the inner wall of the first guide groove to guide the movement direction of the valve needle assembly 20 by using the first guide groove, so that the valve needle assembly 20 can reciprocate smoothly in the first direction or the second direction.

As shown in fig. 4 and 8, in the present embodiment, the first guide groove extends in the up-down direction, the upper end of the valve rod 21 defines the second guide portion 201, the second guide portion 201 is slidably engaged with the inner side wall of the first guide groove, and when the valve rod 21 moves in the up-down direction, the second guide portion 201 can slide in the up-down direction in the first guide groove, so that the valve rod 21 can smoothly and stably slide in the up-down direction, and the valve rod 21 can drive the valve needle 22 to smoothly open or close the valve port 12.

The second guide 201 is defined at the upper end of the valve rod 21, and the first guide groove is configured to define the moving direction of the valve rod 21 by cooperating with the second guide 201, so that the upper end of the valve rod 21 can be reduced from shaking when the valve rod 21 reciprocates. Specifically, if the length of the valve rod 21 is longer, when the valve rod 21 moves, the upper end of the valve rod 21 can easily shake, so that the upper end of the valve rod 21 is matched with the first guide groove to guide the moving direction of the upper end of the valve rod 21, thereby being convenient for reducing the shaking amplitude of the upper end of the valve rod 21 and improving the moving stability of the valve rod 21.

In some examples, the groove bottom wall of the first guide groove defines a first stop 71, and when the valve stem 21 moves upward along the first guide groove, the valve needle assembly 20 no longer moves upward when the upper end surface of the valve stem 21 is in stop engagement with the groove bottom wall of the first guide groove, at which time the valve needle assembly 20 fully opens the valve port 12.

In some embodiments, the cross section of the outer peripheral wall of the second guiding portion 201 is formed into a non-circular shape, the cross section of the first guiding groove is formed into a non-circular hole, the second guiding portion 201 extends into the first guiding groove, when the valve rod 21 has a rotation trend, the side wall of the first guiding groove has a rotation stopping force on the second guiding portion 201, and further has a rotation stopping force on the valve rod 21, so that the rotation freedom degree of the valve rod 21 is limited, the valve rod 21 can only drive the valve needle 22 to reciprocate in the up-down direction and not rotate, when the valve needle 22 opens or closes the valve port 12, friction between the valve needle 22 and the valve body 10 can be reduced, the degree of mutual abrasion between the valve needle 22 and the valve body 10 is reduced, the service life of the valve needle 22 is conveniently prolonged, and the service life of the electronic expansion valve 1 is conveniently prolonged.

In some alternative embodiments of the utility model, as shown in FIG. 1, the valve body 10 includes a valve seat 101 and a valve cap 102, the valve seat 101 defining a mounting cavity 103 having an upper opening 104, the valve cap 102 being adapted to close the upper opening 104, the first stop 71 being provided to the valve cap 102, the valve needle assembly 20 being movable away from the valve port 12 when the valve needle assembly 20 is moved within the mounting cavity 103 to open the valve port 12, the valve needle assembly 20 no longer being movable when the valve stem 21 is in abutting engagement with the first stop 71, at which time the valve needle assembly 20 fully opens the valve port 12.

In some embodiments, as shown in fig. 1, the valve cover 102 is disposed above the mounting cavity 103, the lower bottom wall of the valve cover 102 forms the first stopper 71, the needle assembly 20 is reciprocally movable in the mounting cavity 103 in the up-down direction, the needle assembly 20 is moved upward, and the needle assembly 20 is not moved upward when the upper end of the valve stem 21 contacts the lower bottom wall of the valve cover 102, so as to limit the upward movement range of the needle assembly 20.

As shown in fig. 1 and 8, in this embodiment, the valve cover 102 is disposed above the mounting cavity 103, a first guide groove with a downward opening is disposed on the valve cover 102, a bottom wall of the first guide groove forms a first stop portion 71, and when the valve needle assembly 20 reciprocates in the up-down direction, an upper end of the valve rod 21 is slidably matched with a side wall of the first guide groove, and the side wall of the first guide groove can guide a movement direction of the valve rod 21, so as to ensure stability of movement of the valve rod 21 in the up-down direction, facilitate reduction of shake generated when the valve rod 21 moves, and reduce noise generated in the electronic expansion valve 1.

Wherein, when the valve needle assembly 20 moves upwards to open the valve port 12, and the upper end of the valve rod 21 is abutted against the bottom wall of the first guide groove, the valve needle assembly 20 does not move upwards any more, so as to limit the upward movement range of the valve needle assembly 20, thereby being convenient for controlling the movement path of the valve needle assembly 20 in the mounting cavity 103, and enabling the valve needle assembly 20 to smoothly open the valve port 12.

In some embodiments of the present utility model, as shown in fig. 2, the blocking assembly includes a second stopper 72, where the second stopper 72 is provided on the valve needle 22, and the second stopper 72 is located on a side of the valve stem 21 near the valve port 12 to limit a movement displacement of the valve stem 21 in a second direction, specifically, a side of the valve needle assembly 20 toward the valve port 13, where the valve stem 21 drives the valve needle 22 to move when the valve stem 21 moves in the second direction, and where relative movement occurs between the valve stem 21 and the valve needle 22, where the valve stem 21 stops moving when the valve stem 21 is in abutment with the second stopper 72 relative to the valve needle 22, and where the valve needle 22 fully closes the valve port.

As shown in fig. 1, the first direction is an upward direction, the second direction is a downward direction, the valve needle assembly 20 can reciprocate in the up-down direction, and by providing the second stop member 72, the range of downward movement of the valve rod 21 in the up-down direction can be limited, so that the valve rod 21 can drive the valve needle 22 to fully close the valve port 12 without excessive downward movement, and the range of downward movement of the valve rod 21 can be precisely controlled, so that the valve port 12 can be fully closed when the valve rod 21 stops with the second stop member 72 and stops moving downward.

In some alternative embodiments of the utility model, the second stop 72 and the valve needle 22 are an integral piece.

As shown in fig. 2, in the present embodiment, a receiving chamber 221 is provided in the valve needle 22, a stepped second stopper 72 is formed on the upper end peripheral wall of the receiving chamber 221, one end of the valve rod 21 extends into the receiving chamber 221 for being in stop fit with the second stopper 72, the valve needle 22 is driven to move downward when the valve rod 21 moves downward, and the valve rod 21 does not move any further when the valve rod 21 moves downward relative to the valve needle 22 and is in stop fit with the second stopper 72, and the valve needle 22 fully closes the valve port 12.

In some alternative embodiments of the present utility model, the electronic expansion valve 1 further includes a pressing sleeve 73, the pressing sleeve 73 is disposed on the valve needle 22, in the first direction, the pressing sleeve 73 is located on one side of the second stopper 72, and the pressing sleeve 73 is adapted to contact with the valve rod 21 so that the valve rod 21 drives the valve needle 22 to move along the first direction, so that the valve needle 22 can open or close the valve port 12 under the driving of the valve rod 21.

As shown in fig. 2, in the present embodiment, the first direction is an upward direction, the second direction is a downward direction, the needle assembly 20 is reciprocally movable in the up-down direction, the pressing sleeve 73 is located above the second stopper 72, the pressing sleeve 73 and the second stopper 72 are disposed at a distance in the up-down direction, and a portion of the lower end of the valve stem 21 is located between the second stopper 72 and the pressing sleeve 73.

When the valve rod 21 moves downwards, the valve rod 21 drives the valve needle 21 to move downwards, and when the valve rod 21 moves downwards relative to the valve needle 21 and the valve rod 21 abuts against the second stop piece 72 on the valve needle 22, the valve rod 21 does not move any more, and at the moment, the valve needle 22 fully closes the valve port 12. When the valve rod 21 moves upwards, the valve rod 21 moves upwards relative to the valve needle 22, when the valve rod 21 is in abutting engagement with the pressing sleeve 73, the valve rod 21 drives the valve needle 22 to move upwards through the pressing sleeve 73, the valve needle 22 gradually opens the valve port 12, and when the valve rod 21 moves upwards to be in abutting engagement with the first stop piece 71, the valve rod 21 stops moving upwards, and at the moment, the valve needle 22 fully opens the valve port 12.

In some embodiments of the present utility model, the valve needle assembly 20 further includes an elastic member 23, where the elastic member 23 is connected to the valve rod 21 and the valve needle 22, respectively, and when the valve needle 22 closes the valve port 12, the valve rod 21 can move the elastic member 23 toward the valve port 12 to form a pre-tightening force, so that when the valve needle 22 closes the valve port 12, the elastic member 23 can have a force toward the valve port 12 on the valve needle 22 to increase a stopping force between the valve needle 22 and the valve body 10, so that the valve needle 22 can fully close the valve port 12, avoiding a gap between the valve needle 22 and the valve port 12, avoiding liquid leakage, and facilitating improvement of the yield of the electronic expansion valve 1.

In some embodiments, when the valve rod 21 moves in the up-down direction, the valve rod 21 drives the valve needle 22 to move in the up-down direction, when the outer peripheral surface of the valve needle 22 contacts with the valve body 10 and is in abutting engagement, the valve needle 22 closes the valve port 12, the valve rod 21 can move downwards continuously but can not drive the valve needle 22 to move downwards, at this time, the valve rod 21 compresses the elastic element 23, so that the elastic element 23 forms a pretightening force, and then the pretightening force is applied to the valve needle 22 through the elastic element 23, so that the valve needle 22 can fully close the valve port 12, and liquid leakage is avoided.

Specifically, after the elastic member 23 is compressed, the elastic member 23 has a downward acting force on the valve needle 22, so that the outer peripheral surface of the lower end of the valve needle 22 is tightly attached to the valve body 10, so as to fully seal the valve port 12, avoid a gap between the valve needle 22 and the valve port 12, avoid liquid leakage, and facilitate improvement of the qualification rate of the electronic expansion valve 1.

In some embodiments, the valve needle 22 is provided with the accommodating cavity 221, the elastic member 23 is disposed in the accommodating cavity 221, and when the valve needle 22 closes the valve port 12, the elastic member 23 can have acting force towards the valve port 12 on the valve needle 22, so as to increase the stopping force between the valve needle 22 and the valve body 10, so that the valve needle 22 can fully close the valve port 12, avoid a gap between the valve needle 22 and the valve port 12, avoid liquid leakage, and facilitate improving the qualification rate of the electronic expansion valve 1.

As shown in fig. 3, in this embodiment, the lower end of the valve rod 21 extends into the accommodating cavity 221, the elastic member 23 abuts against the valve rod 21 and the inner bottom wall of the accommodating cavity 221, after the valve rod 21 drives the valve needle 22 to move and close the valve port 12, the valve rod 21 can still move in the accommodating cavity 221 towards the direction close to the valve port 12, so that the lower end of the valve rod 21 can compress the elastic member 23 in the accommodating cavity 221, and the elastic member 23 forms a pretightening force, and at this time, the elastic member 23 has a force towards the valve port 12 on the valve needle 22, so that the valve needle 22 can fully close the valve port 12, and the leakage of the electronic expansion valve 1 is avoided.

When the valve rod 21 moves downwards and the end of the valve rod 21 abuts against the second stop member 72, the valve rod 21 stops moving, so as to limit the moving range of the valve rod 21 in the accommodating cavity 221, and avoid the situation that the valve rod 21 excessively compresses the elastic member 23 to cause the failure of the elastic member 23 and the like.

Specifically, the valve rod 21 can move along the up-down direction, the upper peripheral wall of the accommodating cavity 221 defines a stepped second stop piece 72, the second stop piece 72 is located below the valve rod 21, when the lower end of the valve rod 21 is in stop fit with the second stop piece 72, the elastic piece 23 is compressed and has a force towards the valve port 12 on the valve needle 22, and at the moment, the lower end of the valve rod 21 cannot continue to move in the accommodating cavity 221, so that the elastic piece 23 in the accommodating cavity 221 cannot continue to be compressed, the compression amount of the elastic piece 23 can be controlled, and the magnitude of the pretightening force on the elastic piece 23 is controlled, so that the valve needle 22 is prevented from being clamped at the valve port 12 due to the fact that the downward acting force of the elastic piece 23 on the valve needle 22 is too large.

In some embodiments of the present utility model, as shown in fig. 2, a guide channel 131 and a communication channel 132 are provided in the valve body 10, the communication channel 132 communicates with the valve port 12, the guide channel 131 is located on a side of the communication channel 132 away from the valve port 12, a step portion 133 is provided at a junction of the guide channel 131 and the communication channel 132, and the valve needle 22 is movable in the guide channel 131 and the communication channel 132, and the valve needle assembly 20 closes the valve port 12 when the valve needle 22 is in stop-fit with the step portion 133.

In some embodiments, as shown in fig. 3, the valve needle assembly 20 includes a guide portion 223 and a blocking portion 224, the guide portion 223 slidably engaging with the guide channel 131 to limit the direction of movement of the guide portion 223, thereby enabling the blocking portion 224 to smoothly open or close the valve port 12.

Wherein, the cross-sectional area of the blocking portion 224 gradually decreases towards the valve port 12, a part of the blocking portion 224 extends into the communication channel 132 and the peripheral wall of the blocking portion 224 is stopped against the step portion 133, so that when the valve needle assembly 20 moves towards the direction approaching the valve port 12, the distance between the peripheral wall of the blocking portion 224 and the step portion 133 gradually decreases, and when the peripheral wall of the blocking portion 224 is stopped against the step portion 133, the blocking portion 224 blocks the valve port 12, so as to fully seal the valve port 12, thereby avoiding the leakage of the electronic expansion valve 1.

In some examples, the blocking portion 224 is made of an elastic material, the blocking portion 224 is formed as a cone, the apex of the cone is downward, the distance between the outer circumferential surface of the blocking portion 224 and the step portion is gradually reduced when the valve needle assembly 20 moves downward, and at the same time, the step portion 133 has a pressing force on the blocking portion 224 when the blocking portion 224 moves downward, and the blocking portion 224 may be adaptively deformed, so that the blocking portion 224 can sufficiently block the valve port 12.

As shown in fig. 2, in the present embodiment, the guide passage 131 is located above the communication passage 132, the valve port 12 is located below the communication passage 132, the guide portion 223 is located above the blocking portion 224, the side wall of the guide passage 131 extends in the up-down direction, the side wall of the guide portion 223 extends in the up-down direction, and the side wall of the guide portion 223 is slidably engaged with the side wall of the guide passage 131 to restrict the moving direction of the guide portion 223 and thus the moving direction of the needle assembly 20, so that the needle assembly 20 can smoothly move in the up-down direction to open or close the valve port 12.

In some embodiments, the upper portion of the needle assembly 20 forms the second guide 201, the guide 223 is located at the lower portion of the needle assembly 20, and when the needle assembly 20 reciprocates in the up-down direction, the second guide 201 slides in the first guide groove, and the guide 223 slides in the guide passage 131 to limit the movement direction of the needle assembly 20 from the upper end of the needle assembly 20 and the lower end of the needle assembly 20, so that shaking of the needle assembly 20 during movement is reduced, stability of movement of the needle assembly 20 is improved, and the needle assembly 20 can smoothly open or close the valve port 12.

Wherein when the valve rod 21 moves upwards, the valve rod 21 drives the valve needle 22 to move upwards so as to enable the valve needle 22 to move in a direction away from the valve port 12, and when the second guide part 201 on the valve rod 21 is in stop fit with the first stop piece 71, the valve rod 21 stops moving upwards, and at the moment, the valve needle 22 completely opens the valve port 12.

When the valve rod 21 moves downwards, the valve rod 21 drives the valve needle 22 to move downwards so as to enable the valve needle 22 to move towards the direction approaching the valve port 12, when the blocking part 224 on the valve needle 22 is in abutting fit with the step part 133, the valve needle 22 closes the valve port 12, the valve needle 22 does not move downwards any more, but the valve rod 21 can move downwards for a certain distance relative to the valve needle 22, at the moment, the valve rod 21 moves downwards in the accommodating cavity 221, when the valve rod 21 is in abutting fit with the second stop part 72 in the accommodating cavity 221, the valve rod 21 does not move downwards any more, so that the valve rod 21 can compress the elastic part 23, the elastic part 23 forms a pretightening force, and the elastic part 23 has a force towards the valve port 12 on the valve needle 22, so that the valve needle 22 can fully close the valve port 12, and liquid leakage of the electronic expansion valve 1 is avoided.

In some embodiments of the present utility model, the valve needle assembly 20 further includes a pressing sleeve 73, where the pressing sleeve 73 is used to close an opening of the accommodating cavity 221 away from the valve port 12, so as to limit a portion of a lower end of the valve rod 21 between the second stopper 72 and the pressing sleeve 73, and further enable the valve rod 21 to drive the valve needle 22 to reciprocate along the first direction and the second direction, so that the valve needle 22 can open or close the valve port 12, and avoid the valve rod 21 from being disengaged from the valve needle 22 during the moving process.

In some alternative embodiments of the present utility model, as shown in fig. 1, the electronic expansion valve 1 further includes a mating member 40, the mating member 40 is fixed to the valve body 10, the valve stem 21 has a first mating portion 211, the mating member 40 is provided with a second mating portion 41, and the first mating portion 211 and the second mating portion 41 cooperate to limit the rotational freedom of the valve stem 21, so that the valve stem 21 and the valve needle 22 can only reciprocate in the mounting cavity 103 and cannot rotate, thereby reducing friction between the valve needle 22 and the valve body 10 when the valve needle 22 opens or closes the valve port 12, reducing the mutual abrasion degree of the valve needle 22 and the valve body 10, facilitating improvement of the sealing performance when the valve needle assembly 20 closes the valve port 12, improving the service life of the valve needle assembly 20, and facilitating improvement of the service life of the electronic expansion valve 1.

In some embodiments, as shown in fig. 1, the electronic expansion valve 1 further includes a rotating member 30, where the rotating member 30 is rotatably disposed in the mounting cavity 103, the rotating member 30 is in threaded engagement with the valve rod 21, and when the rotating member 30 rotates, the rotating member 30 can drive the valve rod 21 to reciprocate in an up-and-down direction, and the valve rod 21 can drive the valve needle 22 to reciprocate in the up-and-down direction, so that the valve needle 22 can open or close the valve port 12.

Specifically, when the rotating member 30 drives the valve rod 21 to move in the up-down direction, the valve rod 21 has a tendency to rotate with the rotating member 30, and under the restriction of the matching member 40, the valve rod 21 only reciprocates in the mounting cavity 103 and does not rotate with the rotating member 30, and the valve needle 22 is matched with the valve rod 21, and when the valve rod 21 reciprocates, the valve rod 21 can drive the valve needle 22 to reciprocate, so that the valve needle 22 can open or close the valve port 12.

In some embodiments, the rotating member 30 is provided with a mating space 301, and one end of the mating member 40 extends into the mating space 301 to mate with a mating bearing 62 located in the mating space 301, so that the position of the rotating member 30 is supported by the mating member 40, and the rotating member 30 can rotate stably.

As shown in fig. 5, in this embodiment, the rotating member 30 defines a mating space 301 with a downward opening, the upper end of the mating member 40 extends into the mating space 301, the inner ring of the mating bearing 62 is fixedly connected with the mating member 40, the outer ring of the mating bearing 62 is fixedly connected with the side wall of the mating space 301, so that the mating bearing 62 is utilized to connect the mating member 40 with the rotating member 30, the position of the mating bearing 62 and the rotating member 30 in the mounting cavity 103 is supported by the mating member 40, so that the rotating member 30 can smoothly rotate in the mounting cavity 103, and the rotating member 30 can drive the valve rod 21 and the valve needle 22 to reciprocate in the mounting cavity 103, so that the valve needle 22 can open or close the valve port 12.

Wherein, the outer lane lateral wall of mating bearing 62 is laminated with the lateral wall of mating space 301 mutually to the area of contact of the outer lane of mating bearing 62 and mating space 301 lateral wall is convenient for increase, and then is convenient for be in the same place mating bearing 62 outer lane and the fixed connection of rotating member 30, and mating bearing 62 inner circle is laminated with the lateral wall of mating member 40, in order to increase mating bearing 62 and mating member 40's area of contact, and then is convenient for be in the same place mating bearing 62 inner circle and mating member 40 fixed connection, in order to make mating member 40 can carry out steady support to the position of mating bearing 62, and mating bearing 62 can carry out steady support to the rotation of rotating member 30.

In some embodiments, as shown in fig. 5, the inner race of the mating bearing 62 is fixedly connected to the mating member 40 by a retainer ring 61, so that the mating member 40 can stably support the position of the mating bearing 62. In other embodiments, the inner ring of the mating bearing 62 and the mating member 40 may be fixedly connected by a clamping structure or a fastener, so that the mating member 40 can stably support the position of the mating bearing 62.

In some examples, as shown in fig. 6, the fitting 40 is provided with a mounting groove 43 and a supporting step 44, the supporting step 44 is located below the mounting groove 43, the retainer ring 61 is fixed in the mounting groove 43, the retainer ring 61 is located at the upper end of the fitting bearing 62, the upper end surface of the fitting bearing 62 is in stop fit with the lower end surface of the retainer ring 61, the lower end surface of the fitting bearing 62 is in stop fit with the supporting step 44, so that the fitting bearing 62 is fixed between the retainer ring 61 and the supporting step 44, and then the fitting bearing 62 is fixed on the fitting 40, so that the fitting 40 is connected with the rotating member 30 through the fitting bearing 62, so that the fitting 40 can support the positions of the rotating member 30 and the fitting bearing 62, and further the rotating member 30 can smoothly rotate.

In some embodiments of the present utility model, the cross-section of the outer peripheral wall of the first mating portion 211 is formed into a non-circular shape, the second mating portion 41 is formed into a non-circular mating hole, the first mating portion 211 extends into the mating hole to enable the first mating portion 211 and the second mating portion 41 to mate, the second mating portion 41 is used to limit the rotational freedom of the first mating portion 211, and further limit the rotational freedom of the valve stem 21 and the valve needle 22, so that the valve stem 21 and the valve needle 22 can only reciprocate in the mounting cavity 103 and cannot rotate, when the valve needle 22 opens or closes the valve port 12, friction between the valve needle 22 and the valve body 10 can be reduced, the degree of mutual abrasion between the valve needle 22 and the valve body 10 is reduced, the service life of the valve needle assembly 20 is facilitated to be improved, and the service life of the electronic expansion valve 1 is facilitated to be improved.

Wherein, utilize the cooperation of first cooperation portion 211 and mating hole to restrict the rotation of valve rod 21 and needle 22, this kind of structure is comparatively simple, is convenient for reduce the structure complexity of cooperation spare 40 and needle subassembly 20, reduces the structure complexity of electronic expansion valve 1, is convenient for practice thrift the cost.

In some embodiments, when the rotating member 30 rotates, the rotating member 30 drives the valve rod 21 to reciprocate, the valve rod 21 drives the valve needle 22 to reciprocate, under the driving of the rotating member 30, the valve rod 21 has a rotating tendency, so that the first matching portion 211 extends into the matching hole, because the matching member 40 is fixed on the valve body 10, the valve rod 21 and the valve needle 22 can reciprocate relative to the matching member 40, the valve rod 21 and the valve needle 22 cannot drive the matching member 40 to rotate, when the valve rod 21 has a rotating tendency, the side wall of the matching hole has a rotation stopping force on the first matching portion 211, so as to limit the rotation freedom degree of the valve rod 21, so that the valve rod 21 can only reciprocate in the mounting cavity 103 and cannot rotate, thereby avoiding that the rotating member 30 can drive the valve rod 21 to rotate, avoiding that the valve rod 21 can drive the valve needle 22 to rotate, further reducing friction between the valve needle 22 and the valve body 10 when the valve needle 22 opens or closes the valve port 12, and being convenient for reducing noise generated in the electronic expansion valve 1.

In some embodiments, as shown in fig. 4 and 7, the cross section of the outer peripheral wall of the first mating portion 211 may be a non-circular shape such as triangle, rectangle, square or hexagon, and the corresponding second mating portion 41 is formed as a non-circular mating hole such as triangle, rectangle, square or hexagon, the outer peripheral wall of the first mating portion 211 is a first limiting surface 2111, the inner peripheral wall of the mating hole is a second limiting surface 411, and the first limiting surface 2111 and the second limiting surface 411 are in contact and mated.

When the rotating member 30 rotates, the rotating member 30 drives the valve rod 21 to reciprocate, when the valve rod 21 has a rotating trend, the second limiting surface 411 limits the rotation of the first limiting surface 2111, and further limits the rotation of the first matching portion 211, so that the valve rod 21 cannot rotate, the valve rod 21 can only reciprocate in the mounting cavity 103 and cannot rotate, and further the valve rod 21 and the valve needle 22 reciprocate, when the valve needle 22 opens or closes the valve port 1212, friction between the valve needle 22 and the valve body 10 can be reduced, and noise generated in the electronic expansion valve 1 is reduced conveniently.

In other embodiments, the outer circumferential wall of the first fitting portion 211 is provided with one of a guide groove and a guide protrusion, and the sidewall of the second fitting portion 41 is provided with the other of the guide protrusion and the guide groove, and the guide protrusion protrudes into the guide groove and is slidable in the guide groove to guide the moving direction of the needle assembly 20 by the fitting of the guide protrusion and the guide groove, while restricting the rotation of the valve stem 21 by the fitting of the guide protrusion and the guide groove when the valve stem 21 has a tendency to rotate.

In some embodiments of the present utility model, as shown in fig. 2, the guide portion 223 and the guide passage 131 are hermetically engaged to isolate the inlet of the electronic expansion valve 1 from the installation cavity 103, and prevent the liquid from flowing from the inlet of the electronic expansion valve 1 to the installation cavity 103 along the gap between the guide portion 223 and the guide passage 131.

The plugging portion 224 is provided with an air flow passage 2241 therein, the air flow passage 2241 is opened toward the valve port 12, the air flow passage 2241 is communicated with the accommodation chamber 221 to communicate the valve port 12 with the accommodation chamber 221, a side wall of the accommodation chamber 221 is provided with a gas hole 2211, the gas hole 2211 is communicated with the installation chamber 103 to communicate the installation chamber 103 with the accommodation chamber 221, and then the valve port 12, the accommodation chamber 221 and the installation chamber 103 are communicated, so that the air pressure at the valve port 12 of the electronic expansion valve 1 is balanced with the air pressure inside the electronic expansion valve 1, and the difficulty of opening the valve port 12 by the valve needle assembly 20 is further reduced.

Specifically, if the valve port 12 is not communicated with the interior of the electronic expansion valve 1, when heat is generated in the electronic expansion valve 1 or the air pressure in the electronic expansion valve 1 becomes large due to other reasons, when the air pressure in the electronic expansion valve 1 is larger than the air pressure at the valve port 12 of the electronic expansion valve 1, the valve needle assembly 20 needs a larger force to open the valve port 12, so that the valve port 12, the accommodating cavity 221 and the mounting cavity 103 are communicated, the air pressure in the electronic expansion valve 1 is balanced with the air pressure at the valve port 12, and the difficulty of opening the valve port 12 by the valve needle assembly 20 is reduced conveniently.

In some embodiments, as shown in fig. 1 and 2, the valve seat 101 is provided with a liquid inlet 14, the liquid inlet 14 is arranged on a side wall of the guide channel 131, the valve port 12 is arranged below the guide channel 131, the liquid inlet 14 is communicated with the guide channel 131, and the guide portion 223 and the guide channel 131 are in sealing fit to isolate the liquid inlet 14 from the mounting cavity 103, so that liquid at the liquid inlet 14 can be prevented from flowing into the mounting cavity 103 from a gap between the guide portion 223 and the guide channel 131.

Specifically, when the blocking portion 224 opens the valve port 12, the liquid at the liquid inlet 14 enters the guide passage 131 at a certain speed, and flows out from the valve port 12 along the guide passage 131. When the blocking part 224 closes the valve port 12, the liquid at the liquid inlet 14 has a certain impact force on the blocking part 224, and the liquid at the liquid inlet 14 impacts the blocking part 224 and can flow upwards, so that the guide part 223 and the guide channel 131 are in sealing fit, and the liquid at the liquid inlet 14 can be prevented from flowing into the installation cavity 103 along the gap between the guide part and the blocking part 224.

In some examples, as shown in fig. 2, the electronic expansion valve 1 further includes a sealing member 64, the sealing member 64 is sleeved on the guide portion 223, and the sealing member 64 is located between an outer peripheral wall of the guide portion 223 and a side wall of the guide passage 131 to fill a gap between the guide portion 223 and the guide passage 131, so as to avoid liquid at the liquid inlet portion from entering the installation cavity 103 along the gap between the guide portion 223 and the guide passage 131.

In some embodiments, as shown in fig. 4, the cross section of the receiving cavity 221 is circular, the lower end of the valve rod 21 has an abutment 212, and the abutment 212 includes a first arc 2121, a second arc 2122, a first plane 2123 and a second plane 2124, the first plane 2123 is connected to one end of the first arc 2121 and the second arc 2122, and the second plane 2124 is connected to the other end of the first arc 2121 and the second arc 2122.

The stopping portion 212 extends into the accommodating cavity 221, and the first cambered surface 2121 and the second cambered surface 2122 are in stopping fit with the side wall of the accommodating cavity 221 so as to limit the moving direction of the first cambered surface 2121 and the second cambered surface 2122 and further limit the moving direction of the valve rod 21. The first plane 2123 and the second plane 2124 are spaced from the sidewall of the accommodating chamber 221 to form a gas hole 2211, so as to balance the gas pressure in the accommodating chamber 221 and the mounting chamber 103, and balance the internal gas pressure of the electronic expansion valve 1 with the gas pressure at the valve port 12.

In some embodiments of the present utility model, as shown in fig. 2, the outer peripheral wall of the fitting 40 is fixed to the mounting chamber 103, the outer peripheral wall of the fitting 40 partitions the first chamber 111 and the second chamber 112, the gas hole 2211 communicates with the first chamber 111 to communicate the accommodation chamber 221 and the first chamber 111 with the gas hole 2211, and since the air flow passage 2241 communicates the valve port 12 and the accommodation chamber 221, the valve port 12, the air flow passage 2241, the accommodation chamber 221 and the first chamber 111 communicate.

Wherein, the rotating member 30 is located in the second chamber 112, and the valve needle assembly 20 passes through the matching member 40, so that the valve needle assembly 20 can be matched with the rotating member 30 located in the second chamber 112, and when the rotating member 30 rotates, the rotating member 30 can drive the valve needle assembly 20 to reciprocate, so that the valve needle assembly 20 can open or close the valve port 12.

As shown in fig. 1 and 2, in the present embodiment, the fitting member 40 partitions the mounting cavity 103 into a first chamber 111 and a second chamber 112 along the up-down direction, the second chamber 112 is located above the first chamber 111, the fitting member 40 is sleeved outside the valve rod 21, the upper end of the valve rod 21 passes through the fitting member 40 to be in threaded engagement with the rotating member 30, and the lower end of the valve rod 21 is in engagement with the valve needle 22. Under the drive of the rotating member 30 and the limitation of the matching member 40, the rotating member 30 can drive the valve rod 21 to move in the up-down direction, and the valve rod 21 can drive the valve needle 22 to move in the up-down direction, so that the valve needle 22 can open or close the valve port 12.

As shown in fig. 2, in the present embodiment, the fitting member 40 partitions the installation cavity 103 into a first chamber 111 and a second chamber 112 along the up-down direction, the second chamber 112 is located above the first chamber 111, the fitting member 40 is sleeved outside the valve rod 21, the upper end of the valve rod 21 passes through the fitting member 40 to be in threaded engagement with the rotating member 30, and the lower end of the valve rod 21 is in engagement with the valve needle 22. Under the drive of the rotating member 30 and the limitation of the matching member 40, the rotating member 30 can drive the valve rod 21 to move in the up-down direction, and the valve rod 21 can drive the valve needle 22 to move in the up-down direction, so that the valve needle 22 can open or close the valve port 12.

As shown in fig. 4 and 7, the mating element 40 has a second mating portion 41, the cross section of the second mating portion 41 is a non-circular hole, the valve rod 21 has a first mating portion 211, the cross section of the outer peripheral wall of the first mating portion 211 is a non-circular hole, the valve rod 21 passes through the second mating portion 41, and the first mating on the valve rod 21 mates with the second mating portion 41 on the mating element 40, so that the valve rod 21 can pass through the mating element 40 to mate with the rotating element 30, and when the rotating element 30 drives the valve rod 21 to move, the second mating portion 41 can limit the rotational freedom of the first mating portion 211, and further limit the rotational freedom of the valve rod 21, so that the valve rod 21 can only reciprocate in the up-down direction and cannot rotate, and further the valve rod 21 can smoothly drive the valve needle 22 to reciprocate in the up-down direction without rotating, so that the valve needle 22 can open or close the valve port 12, and wear between the valve needle 22 and the valve seat 101 is reduced.

In some alternative embodiments of the present utility model, as shown in fig. 2, the matching member 40 is provided with a balancing hole 42, the balancing hole 42 communicates with the first chamber 111 and the second chamber 112, since the gas hole 2211 communicates with the first chamber 111 and the accommodating cavity 221, the balancing hole 42 communicates with the second chamber 112 and the first chamber 111, so that the first chamber 111, the second chamber 112 and the accommodating cavity 221 are all communicated, and simultaneously, the air flow passage 2241 communicates with the accommodating cavity 221 and the valve port 12, so that the valve port 12, the accommodating cavity 221, the first chamber 111 and the second chamber 112 are all communicated to balance the gas pressure in the valve seat 101 and the gas pressure outside the valve seat 101, so that on one hand, the difficulty of opening the valve of the valve needle assembly 20 is reduced, and on the other hand, when the valve needle assembly 20 opens the valve port 12, the liquid can smoothly flow out through the valve port 12.

In some embodiments, as shown in fig. 2, the electronic expansion valve 1 further includes a fixing member 63, the fixing member 63 is used for fixing the outer peripheral wall of the fitting member 40 to the installation cavity 103, the fitting member 40 and the fixing member 63 divide the installation cavity 103 into a first chamber 111 and a second chamber 112, the second chamber 112 is located above the first chamber 111, a through hole 631 is provided in the fitting member 40, and the through hole 631 communicates with the first chamber 111 and the second chamber 112.

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 utility model, by using the electronic expansion valve 1 according to the embodiment of the utility model and arranging the blocking component on the valve body 10, the blocking component is used for limiting the movable range of the valve needle component 20, so that the valve needle component 20 can accurately and smoothly open or close the valve port 12, and the precision of opening the valve port 12 or closing the valve port 12 by the valve needle component 20 is convenient to improve.

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 utility model, by using the thermal management system according to the above embodiment of the utility model, by providing the blocking assembly on the valve body 10, the movable range of the needle assembly 20 is limited by the blocking assembly, so that the needle assembly 20 can accurately and smoothly open or close the valve port 12, which is convenient for improving the accuracy of the needle assembly 20 for opening the valve port 12 or closing the valve port 12.

Other constructions and operations of B according to embodiments of the present 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, a schematic representation of the above terms does not necessarily refer to the same embodiment or solution: 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 (14)

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

A valve body (10), the valve body (10) defining a mounting cavity (103) and a valve port (12) in communication with the mounting cavity (103);

the valve needle assembly (20) is arranged in the mounting cavity (103) in a reciprocating manner, the valve needle assembly (20) comprises a valve rod (21) and a valve needle (22), the valve rod (21) is connected with the valve needle (22) to drive the valve needle (22) to reciprocate, and the valve needle (22) is used for opening or closing the valve port (12);

and the blocking assembly is arranged in the mounting cavity (103), and is matched with the valve rod (21) to limit the movement displacement of the valve rod (21) in a first direction and a second direction, and the directions of the first direction and the second direction are opposite.

2. The electronic expansion valve (1) according to claim 1, wherein the blocking assembly comprises a first stop (71), the first stop (71) being provided on a side of the valve stem (21) facing away from the valve port (12) to limit the displacement of the valve stem (21) in the first direction.

3. Electronic expansion valve (1) according to claim 2, wherein the first stop (71) is provided with a first guide (711), the valve stem (21) is provided with a second guide (201), the first guide (711) and the second guide (201) cooperate to guide the movement of the valve stem (21).

4. An electronic expansion valve (1) according to claim 3, wherein the first guide (711) is a first guide groove, and the end of the valve stem (21) facing away from the valve port (12) defines the second guide (201) and is in sliding engagement with the first guide groove.

5. Electronic expansion valve (1) according to claim 2, characterized in that said valve body (10) comprises:

a valve seat (101), the valve seat (101) defining a mounting cavity (103) having an upper opening;

and the valve cover (102) is used for closing the upper opening, and the first stop piece (71) is arranged on the valve cover (102).

6. The electronic expansion valve (1) according to claim 1, wherein the blocking assembly comprises a second stop (72), the second stop (72) being provided to the valve needle (22), the second stop (72) being located on a side of the valve stem (21) close to the valve port (12) to limit the movement displacement of the valve stem (21) in the second direction.

7. The electronic expansion valve of claim 6, characterized in that the second stop (72) and the valve needle (22) are an integral piece.

8. The electronic expansion valve (1) according to claim 1, wherein the valve needle assembly (20) further comprises an elastic member (23), the elastic member (23) being connected to the valve stem (21) and the valve needle (22), respectively, the valve stem (21) being movable towards the valve port (12) to compress the elastic member (23) to form a preload when the valve needle (22) closes the valve port (12).

9. Electronic expansion valve (1) according to claim 8, characterized in that a receiving chamber (221) is provided in the valve needle (22), the elastic member (23) being provided in the receiving chamber (221).

10. The electronic expansion valve according to claim 9, characterized in that the valve needle assembly (20) further comprises a pressure sleeve (73), the pressure sleeve (73) being adapted to close off an opening of the receiving chamber (221) facing away from the valve port (12).

11. The electronic expansion valve (1) according to any of the claims 1-10, further comprising a fitting (40), the fitting (40) being fixed to the valve body (10), the valve stem (21) having a first fitting part (211), the fitting (40) being provided with a second fitting part (41), the first fitting part (211) and the second fitting part (41) fitting to limit the rotational freedom of the valve stem (21).

12. The electronic expansion valve (1) according to claim 11, wherein the outer peripheral wall of the first fitting portion (211) is formed in a non-circular shape in cross section, the second fitting portion (41) is formed in a non-circular fitting hole into which the first fitting portion (211) protrudes.

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

14. A vehicle comprising a thermal management system according to claim 13.