CN219493092U - Valve needle assembly, electronic expansion valve, thermal management system and vehicle - Google Patents

Abstract

The utility model provides a valve needle assembly, an electronic expansion valve, a thermal management system and a vehicle, wherein the valve seat assembly comprises a screw rod, a valve needle, a bearing and an elastic element; the bearing sleeve is arranged on the valve needle, the bearing comprises a bearing inner ring and a bearing outer ring, the bearing inner ring is fixed with the valve needle, and the bearing outer ring rotates circumferentially relative to the bearing inner ring; the elastic element is arranged in the spring sleeve, one end of the elastic element is abutted against the screw rod or the spring sleeve, the other end of the elastic element is abutted against the outer ring of the bearing, and the screw rod rotates to drive the valve needle to axially move. The valve needle assembly can effectively reduce abrasion between the valve needle and the valve port of the electronic expansion valve.

Description

Valve needle assembly, electronic expansion valve, thermal management system and vehicle

Technical Field

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

Background

The electronic expansion valve is an important component in a vehicle thermal management system, and generally comprises a valve seat, a driving assembly, a valve needle assembly and the like, and the valve needle assembly is abutted against or separated from a valve port of the electronic expansion valve through the rotation driving of the driving assembly, so that the flow regulation function of the electronic expansion valve is realized. In the related art, the abrasion of the contact surface of the valve needle and the valve port is large, and the internal leakage risk of the valve is large.

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 valve needle assembly which can effectively reduce the abrasion between the valve needle and the valve port of the electronic expansion valve.

The utility model further provides an electronic expansion valve.

The utility model also provides a thermal management system.

The utility model further provides a vehicle.

A valve needle assembly according to a first aspect of the utility model comprises: a screw; a valve needle; the bearing is sleeved on the valve needle and comprises a bearing inner ring and a bearing outer ring, the bearing inner ring is fixed with the valve needle, and the bearing outer ring circumferentially rotates relative to the bearing inner ring; and one end of the elastic element is propped against the screw rod, the other end of the elastic element is propped against the bearing outer ring, and the screw rod rotates to drive the valve needle to axially move.

According to the valve needle assembly provided by the utility model, when the screw rod and the nut assembly are matched to rotate, the screw rod rotates and axially moves simultaneously, the axial movement of the screw rod is transmitted to the valve needle through the elastic element, the bearing and the like, so that the valve needle axially moves, the rotation of the screw rod is transmitted to the bearing outer ring through the elastic element, the bearing outer ring rotates relative to the bearing inner ring, the bearing inner ring does not rotate, and therefore the valve needle connected with the bearing inner ring does not rotate. Because the valve needle only moves axially relative to the valve port but does not rotate in the process of abutting against and separating the valve port, the abrasion between the valve needle and the valve port can be effectively reduced, and the internal leakage risk of the valve is reduced.

In some examples of the present utility model, the spring housing is disposed outside the elastic element, the spring housing is fixedly connected to the screw, and the bearing is disposed in the spring housing.

In some examples of the utility model, the spring housing includes a spring housing body and a stop disposed at an end of the spring housing body remote from the screw, the stop for supporting the bearing.

In some examples of the utility model, the width of the blocking portion protruding inward from the inner wall of the spring housing body along the radial direction of the spring housing is w, the gap between the outer wall of the bearing and the inner wall of the spring housing is c, the outer diameter of the bearing is D, the inner diameter of the bearing is D, and the thickness of the inner ring of the bearing is t1, then c < w.ltoreq.c+ (D-D)/2-t 1.

In some examples of the utility model, the valve needle has a valve needle body on which a first stop and a second stop are spaced apart, the bearing is adapted to be disposed between the first stop and the second stop, and the first stop and the second stop cooperate to limit axial displacement of the bearing relative to the valve needle.

In some examples of the utility model, the first stop portion is disposed at an end of the valve needle body near the screw, the valve needle body being adapted to be configured as a tubular section at a location of the first stop portion, the first stop portion being adapted to be formed by a flaring process.

In some examples of the utility model, the outer diameter and wall thickness of the tubular section when not flared are phi 1 and delta, respectively, wherein 0.2mm < delta < 1/4 phi 1.

In some examples of the utility model, the outer diameter of the tubular section after flaring is phi 2, the inner diameter of the bearing is d, and the thickness of the inner ring of the bearing is t1, then d < phi 2 is less than or equal to d+2t1.

In some examples of the utility model, the second stopper is configured as a convex ring protruding in a radial direction of the needle body, and a width of the second stopper is not greater than a thickness of the bearing inner ring in the radial direction of the needle body.

In some examples of the present utility model, the valve needle assembly further includes an end cap, the end cap is sleeved on the screw rod, and the end cap is fixedly connected with the spring sleeve.

In some examples of the utility model, the screw has a third stop adapted to abut an end face of the end cap, the end cap has a fourth stop adapted to abut an end face of the spring sleeve.

In some examples of the utility model, the end cap is integrally formed with the screw.

An electronic expansion valve according to the second aspect of the utility model comprises a valve seat having a valve port and a valve needle assembly according to the first aspect of the utility model, the valve needle assembly being axially movable to selectively abut or disengage the valve port.

An electronic expansion valve according to a second aspect of the present utility model comprises a valve seat having a valve port and a valve needle assembly according to the first aspect of the present utility model, the valve needle assembly being axially movable to selectively abut or disengage the valve port, the valve seat having a first guide section adapted to the outer wall of the spring housing to guide axial movement of the spring housing.

In some examples of the utility model, the height of the first guide section is greater than the height of the spring housing in the axial direction of the valve needle.

In some examples of the utility model, the valve seat further comprises a nut assembly fixed to the valve seat, and a side of the first guide section facing away from the spring sleeve is adapted to an inner wall of the nut assembly to position the nut assembly.

In some examples of the utility model, the valve seat further has a second guide section that is adapted to a portion of an outer wall of the valve needle to guide axial movement of the valve needle.

The thermal management system according to the third aspect of the utility model comprises an electronic expansion valve according to the second aspect of the utility model.

A vehicle according to a fourth aspect of the utility model comprises a thermal management system according to the third 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

Fig. 1 is a schematic structural view of a valve needle assembly according to an embodiment of the present utility model.

Fig. 2 is a schematic structural view of a valve needle according to an embodiment of the utility model.

Fig. 3 is a schematic view of the valve needle and bearing mating structure according to an embodiment of the utility model.

Fig. 4 is a partial enlarged view of a in fig. 1.

Fig. 5 is a schematic structural view of a spring housing according to an embodiment of the present utility model.

Fig. 6 is a schematic structural view of an end cap according to an embodiment of the present utility model.

Fig. 7 is a schematic view of the screw engaging the end cap according to an embodiment of the present utility model.

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

Fig. 9 is a schematic diagram of a second embodiment of an electronic expansion valve according to the present utility model.

Reference numerals:

100: a valve needle assembly;

10: a screw; 11: a third limit part;

20: a valve needle; 21: a valve needle body; 22: a first limit part; 221: a tubular section; 23: a second limit part;

30: a spring sleeve; 31: a blocking portion; 32: a spring housing body;

40: a bearing; 41: a bearing inner ring; 42: an outer ring of the bearing;

50: an elastic element;

60: an end cap; 61: a fourth limit part;

200: a valve seat; 210: a valve port; 220: a first guide section; 230: a second guide section;

300: a nut assembly; 400: a rotor assembly; 500: a valve sleeve;

1000: an electronic expansion valve.

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 and intended to explain the present utility model and should not be construed as limiting the utility model.

The following disclosure provides many different embodiments, or examples, for implementing different structures of the utility model. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the utility model. Furthermore, the present utility model may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present utility model provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the applicability of other processes and/or the use of other materials.

A valve needle assembly 100 according to an embodiment of the present utility model is described below with reference to fig. 1-9.

As shown in fig. 9, the electronic expansion valve 1000 includes a valve seat 200, a valve needle assembly 100, a nut assembly 300, a rotor assembly 400, a coil, and a valve sleeve 500. The valve sleeve 500 is sleeved outside the rotor assembly 400, the rotor assembly 400 is in transmission connection with the valve needle assembly 100, the valve needle assembly 100 comprises a screw rod 10 and a valve needle 20, a coil is fixedly arranged (can be arranged on the valve seat 200, the integrated module or the sleeve), and when the coil is electrified, the rotor assembly 400 rotates to drive the screw rod 10 to rotate. The nut assembly 300 is fixedly arranged on the valve seat 200, the nut assembly 300 is sleeved on the screw rod 10 of the valve needle assembly 100, and the nut assembly 300 is in threaded fit with the screw rod 10, so that when the screw rod 10 rotates relative to the nut assembly 300, the screw rod 10 simultaneously axially displaces relative to the nut assembly 300. Because the valve seat 200 is provided with the valve port 210, the valve needle 20 is in transmission connection with the screw rod 10, when the screw rod 10 moves axially, the valve needle 20 moves axially along with the valve needle, and the conical part of the valve needle 20 can be abutted against or separated from the valve port 210 on the valve seat 200, so that the flow regulating function of the electronic expansion valve 1000 is realized.

In the related art, when the screw rod rotates, the valve needle can be driven to rotate, the friction force between the valve needle and the valve port can be increased due to the existence of the pretightening force at the moment of opening the valve needle, so that the contact surface of the valve needle and the valve port is worn greatly, the internal leakage risk of the valve can be increased in the product use process, and meanwhile, the flow regulation precision of the electronic expansion valve can be reduced more and more.

As shown in fig. 1 and 3, the valve needle assembly 100 for the electronic expansion valve 1000 provided by the utility model comprises a screw rod 10, a valve needle 20, a bearing 40 and an elastic element 50, wherein the bearing 40 is sleeved on the valve needle 20, the bearing 40 comprises a bearing inner ring 41 and a bearing outer ring 42, the bearing inner ring 41 is fixed with the valve needle 20, the bearing outer ring 42 rotates circumferentially relative to the bearing inner ring 41, one end of the elastic element 50 is abutted against the screw rod 10, the other end of the elastic element 50 is abutted against the bearing outer ring 42, and the screw rod 10 rotates to drive the valve needle 20 to axially move.

It will be appreciated that the elastic element 50 may be a compression spring with one end abutting the screw 10 and the other end abutting the bearing outer ring 42, i.e. the screw 10 is connected to the elastic element 50, the elastic element 50 is connected to the bearing 40, and the bearing 40 is connected to the valve needle 20 by being sleeved on the valve needle 20, thereby realizing the driving connection of the screw 10 and the valve needle 20. As shown in fig. 1, the up-down direction in the drawing is the axial direction, when the screw 10 and the nut assembly 300 are co-rotated, the screw 10 rotates and moves axially at the same time, the axial movement of the screw 10 is transmitted to the valve needle 20 through the elastic element 50, the bearing 40, etc., so that the valve needle 20 moves axially, and the rotation of the screw 10 is transmitted to the bearing outer ring 42 through the elastic element 50, the bearing outer ring 42 rotates relative to the bearing inner ring 41, so that the bearing inner ring 41 does not rotate, and thus the valve needle 20 connected to the bearing inner ring 41 does not rotate. Therefore, the valve needle 20 only moves axially, but does not rotate, and the valve needle 20 and the valve port 210 of the valve seat 200 only move axially relatively, but does not rotate, so that the abrasion of the contact surface of the valve needle 20 and the valve port 210 of the electronic expansion valve 1000 in the opening process is effectively reduced, the internal leakage risk of the valve is reduced, the flow regulation precision attenuation of the electronic expansion valve 1000 is slowed down, and the service life of a product is prolonged. Meanwhile, due to the existence of the clearance of the bearing 30, the coaxiality of the valve needle 20 and the valve port 210 can be better ensured, and the sealing effect is improved.

The elastic element 50 may directly abut against the screw 10 or may indirectly abut against the screw 10.

In some embodiments of the present utility model, as shown in fig. 1, the spring housing 30 is further included, the spring housing 30 is sleeved outside the elastic element 50, the spring housing 30 is fixedly connected with the screw 10, and the bearing 40 is disposed in the spring housing 30.

By the arrangement of the spring sleeve 30, the expansion and contraction of the elastic element 50 can be guided, and the elastic element 50 is prevented from being inclined under the action of force, so that the coaxiality of the screw 10, the valve needle 20 and the valve port 210 is guaranteed, and the accuracy of flow regulation is guaranteed.

In some embodiments of the present utility model, as shown in fig. 1, 4 and 5, the spring housing 30 includes a spring housing body 32 and a blocking portion 31, the blocking portion 31 being provided at an end of the spring housing body 32 remote from the screw 10, the blocking portion 31 being for supporting the bearing 40.

It will be appreciated that the spring housing body 32 is a cylindrical structure, the blocking portion 31 may be an annular structure disposed at an end portion of the spring housing 30, the outer diameter of the bearing 40 is smaller than the inner diameter of the spring housing 30, and the bearing 40 is supported by the blocking portion 31 after being assembled in the spring housing 30, so that the bearing 40 operates more stably.

In some embodiments of the present utility model, as shown in FIGS. 1, 3 and 4, the width of the blocking portion 31 protruding inward from the inner wall of the spring housing main body 32 in the radial direction of the spring housing 30 is w, the gap between the outer wall of the bearing 40 and the inner wall of the spring housing 30 is c, the outer diameter of the bearing 40 is D, the inner diameter of the bearing 40 is D, and the thickness of the bearing inner ring 41 is t1, c < w.ltoreq.c+ (D-D)/2-t 1.

By setting the width w of the inward projection of the blocking portion 31 to satisfy c < w+.c+ (D-D)/2-t 1, the blocking portion 31 functions to support the bearing 40 without exerting a force to rotate the bearing inner ring 41, thereby making the operation of the bearing 40 more reliable.

In some embodiments of the present utility model, as shown in fig. 3, the valve needle 20 has a valve needle body 21, a first stopper 22 and a second stopper 23 are disposed on the valve needle body 21 at intervals, the bearing 40 is adapted to be disposed between the first stopper 22 and the second stopper 23, and the first stopper 22 and the second stopper 23 cooperate to limit axial displacement of the bearing 40 relative to the valve needle 20.

It can be understood that, through the first limiting portion 22 and the second limiting portion 23, the bearing 40 and the valve needle 20 cannot axially move, in other words, the bearing 40 drives the valve needle 20 to axially move synchronously, so that the axial displacement of the valve needle 20 can be controlled more conveniently and accurately, and thus, the flow control of the electronic expansion valve 1000 is more convenient and accurate.

In some embodiments of the present utility model, as shown in fig. 2 and 3, a first stopper 22 is provided at an end of the needle body 21 near the screw 10, and the needle body 21 is suitably configured as a tubular section 221 at a position of the first stopper 22, the first stopper 22 being formed by a flaring process.

After the bearing 40 is sleeved on the tubular section 221, the first limiting part 22 is formed through a flaring process to limit upward displacement of the bearing 40, so that the bearing 40 is convenient to install, and the valve needle 20 is simple in structure.

In some embodiments of the utility model, as shown in FIG. 2, the outer diameter and wall thickness of the tubular segment 221 when un-flared are phi 1 and delta, respectively, wherein 0.2mm < delta < 1/4 phi 1. By designing the outer diameter phi 1 and the pipe wall thickness delta of the non-flared front tubular section 221, the flaring process can be easier to realize, the flaring degree is easier to ensure, and the success rate of assembling the bearing 40 and the valve needle 20 is improved.

In some embodiments of the utility model, as shown in FIG. 3, the outer diameter of the tubular segment 221 after flaring is φ 2, the inner diameter of the bearing 40 is d, and the thickness of the bearing inner ring 41 is t1, then d < φ 2.ltoreq.d+2t1. It can be appreciated that the valve needle 20 is coaxially arranged with the bearing 40, and the outer wall of the valve needle 20 is attached to the inner wall of the bearing 40, so that the outer diameter of the tubular section 221 after flaring satisfies d < phi 2 less than or equal to d+2t1, the first limiting portion 22 formed after flaring is matched with the bearing inner ring 41 to limit the axial displacement of the bearing 40, meanwhile, the first limiting portion 22 does not interfere with the rotation of the bearing outer ring 42, and the size of the first limiting portion 22 is smaller and easy to realize.

In some embodiments of the present utility model, as shown in fig. 3, the second stopper 23 is configured as a convex ring protruding in the radial direction of the needle body 21, and the width of the second stopper 23 is not greater than the thickness of the bearing inner ring 41 in the radial direction of the needle body 21, and then the second stopper 23 is adapted to be fitted with the bearing inner ring 41 to restrict the axial movement of the bearing 40. It can be appreciated that when the second limiting portion 23 is a convex ring and the bearing 40 is sleeved on the valve needle 20, the second limiting portion 23 and the bearing inner ring 41 can be matched to limit the downward movement of the bearing 40, the second limiting portion 23 does not interfere with the rotation of the bearing outer ring 43, meanwhile, the second limiting portion 23 can position the assembling position of the bearing 40, then the first limiting portion 22 is formed through the flaring process and the like, the bearing 40 is fixed on the valve needle 20, and the second limiting portion 23 and the valve needle main body 21 can be integrally formed, so that the position and strength of the bearing are easy to ensure.

In some embodiments of the present utility model, as shown in fig. 1, 6 and 7, the valve needle assembly 100 further includes an end cap 60, the end cap 60 is sleeved on the screw 10, and the end cap 60 is fixedly connected with the spring sleeve 30. Through setting up end cover 60, then can be after screw rod 10 part is placed in spring housing 30, locate screw rod 10 with end cover 60 cover, the landing reaches the state of being in butt with spring housing 30 upper end, at this moment, end cover 60 can be fixed through welding, joint or other modes with screw rod 10, and end cover 60 can be connected fixedly through welding, joint etc. with spring housing 30 to realize the fixed connection of screw rod 10 and spring housing 30, the assembly is simple, and the quality is easily guaranteed.

In some embodiments of the present utility model, as shown in fig. 1, 6 and 7, the screw 10 has a third limiting portion 11, the third limiting portion 11 is adapted to abut against an end surface of the end cap 60, the end cap 60 has a fourth limiting portion 61, and the fourth limiting portion 61 is adapted to abut against an end surface of the spring housing 30. By the third limiting portion 11 and the fourth limiting portion 61, the screw 10, the end cover 60 and the spring housing 30 can be positioned, and the welding operation and the like can be facilitated.

In some embodiments of the utility model, the end cap 60 and the screw 10 are integrally formed. In this way, only the end cover 60 and the spring sleeve 30 need to be welded and estimated, and the process difficulty is further reduced.

Describing the assembly process of the needle assembly 100, the needle assembly 100 includes the screw 10, the needle 20, the spring housing 30, the bearing 40, the elastic member 50, and the end cap 60, first, the bearing 40 is sleeved on the needle 20, the lower portion of the bearing 40 is blocked by the second stopper 23, and then the tubular section 221 of the upper portion of the needle 20 is formed into the first stopper 22 through a flaring process, thereby assembling the bearing 40 to the needle 20. The assembled bearing 40 and the valve needle 20 are assembled in the spring sleeve 30 from the upper part, the bearing 40 is clamped by the blocking part 31 at the lower part of the spring sleeve 30, the elastic element 50 is assembled in the spring sleeve 30, the screw 10 is assembled at the upper part of the spring sleeve 30 from the upper part and is pressed on the elastic element 50, the lower end of the elastic element 50 is abutted against the bearing outer ring 42, the upper end of the elastic element 50 is abutted against the screw 10, the end cover 60 is sleeved on the screw 10 and is positioned by the third limiting part 11 at the lower part of the screw 10, and finally the end cover 60 is fixed with the screw 10 and the spring sleeve 30 through a welding process. The valve needle assembly 100 has the advantages that the structure of each part is simple, the assembly process is simple, the positioning is carried out through each limiting part, and the assembly quality is easy to ensure.

An electronic expansion valve 1000 in accordance with an embodiment of the second aspect of the present utility model, as shown in fig. 8, includes a valve seat 200 and a valve needle assembly 100 in accordance with an embodiment of the first aspect of the present utility model, the valve seat 200 having a valve port 210, the valve needle assembly 100 axially moving to selectively abut or disengage the valve port 210. By including the valve needle assembly 100 of the embodiment of the first aspect, all of its advantageous effects are thus provided and will not be described in detail herein.

In some embodiments of the present utility model, as shown in FIG. 9, the valve seat 200 has a first guide section 220, the first guide section 220 being adapted to the outer wall of the spring housing 30 to guide the axial movement of the spring housing 30.

It can be understood that the screw 10, the spring sleeve 30 and the valve needle 20 are in transmission connection, so that the axial movement of the spring sleeve 30, that is, the axial movement of the valve needle 20, is guided, so that the coaxiality of the valve needle 20 and the valve port 210 is easy to be ensured, and accurate flow adjustment of the electronic expansion valve 1000 is convenient to realize. And by arranging the first guide section 220 on the valve seat 200, parts such as a guide sleeve in the related art can be omitted, the assembly is simpler and more convenient, and the assembly precision is easier to ensure.

In some embodiments of the present utility model, as shown in fig. 9, the height of the first guide section 220 is greater than the height of the spring housing 30 in the axial direction of the valve needle 20. By this arrangement, the spring housing 30 can be engaged with the first guide section 220 during the entire axial movement, i.e., the entire axial movement of the spring housing 30 can be guided.

In some embodiments of the present utility model, as shown in fig. 9, the present utility model further includes a nut assembly 300, wherein the nut assembly 300 is fixed to the valve seat 200, and a side of the first guide section 220 facing away from the spring housing 30 is adapted to an inner wall of the nut assembly 300 to position the nut assembly 300.

It can be appreciated that the higher the coaxiality of the screw 10, the valve needle 20 and the valve port 210, the higher the flow control accuracy, and the positioning and assembling of the nut assembly 300 and the spring housing 30 are facilitated by adapting the two sides of the first guiding section 220 to the nut assembly 300 and the spring housing 30 respectively, so that the coaxiality of the screw 10, the valve needle 20 and the valve port 210 is ensured conveniently.

In some embodiments of the utility model, as shown in fig. 9, the valve seat 200 also has a second guide section 230, the second guide section 230 being adapted to part of the outer wall of the valve needle 20 to guide the axial movement of the valve needle 20.

The axial movement of the valve needle 20 is further guided by the adaptation of the second guide section 230 to a part of the outer wall of the valve needle 20. It will be appreciated that, in order to ensure coaxiality of the screw 10, the valve needle 20 and the valve port 210, the valve seat 200 is provided with a first guide section 220 and a second guide section 230, and the first guide section 220 positions the assembly of the nut assembly 300 to ensure coaxiality of the nut assembly 300 and the valve port 210, so as to ensure coaxiality of the screw 10 and the valve port 210 in threaded engagement with the nut assembly 300; the screw rod 10 is fixedly connected with the spring sleeve 30, the spring sleeve 30 is guided through the first guide section 220, the spring sleeve 30 is ensured to be coaxial with the valve port 210 in the whole axial movement process, the spring sleeve 30 is in transmission connection with the valve needle 20, the valve needle 20 is positioned and guided in axial movement through the second guide section 230, the valve needle 20 is ensured to be coaxial with the valve port 210, and therefore the coaxiality of the screw rod 10, the valve needle 20 and the valve port 210 is ensured, and the flow regulation accuracy of the electronic expansion valve 1000 is ensured.

The thermal management system according to the embodiment of the third aspect of the present utility model includes the electronic expansion valve 1000 according to the embodiment of the second aspect of the present utility model. By including the electronic expansion valve 1000 according to the second aspect of the present utility model, all the advantageous effects thereof are provided and will not be described herein.

The vehicle according to the embodiment of the fourth aspect of the present utility model includes the thermal management system according to the embodiment of the third aspect of the present utility model, and has all the advantageous effects thereof, which will not be described 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", "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 to simplify 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, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some 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 present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

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 (19)

1. A valve needle assembly, comprising:

a screw;

a valve needle;

the bearing is sleeved on the valve needle and comprises a bearing inner ring and a bearing outer ring, the bearing inner ring is fixed with the valve needle, and the bearing outer ring circumferentially rotates relative to the bearing inner ring;

and one end of the elastic element is propped against the screw rod, the other end of the elastic element is propped against the bearing outer ring, and the screw rod rotates to drive the valve needle to axially move.

2. The valve needle assembly of claim 1, further comprising a spring housing, the spring housing being disposed outside the resilient element, the spring housing being fixedly connected to the screw, and the bearing being disposed within the spring housing.

3. The valve needle assembly of claim 2, wherein the spring housing comprises a spring housing body and a stop disposed at an end of the spring housing body remote from the threaded rod, the stop for supporting the bearing.

4. A valve needle assembly according to claim 3, wherein the blocking portion protrudes inwardly from the inner wall of the spring housing body in the radial direction of the spring housing by a width w, the gap between the outer wall of the bearing and the inner wall of the spring housing is c, the outer diameter of the bearing is D, the inner diameter of the bearing is D, and the thickness of the inner ring of the bearing is t1, c < w+.c+ (D-D)/2-t 1.

5. The valve needle assembly of claim 1, wherein the valve needle has a valve needle body, first and second stop portions are disposed on the valve needle body at intervals, the bearing is adapted to be disposed between the first and second stop portions, and the first and second stop portions cooperate to limit axial displacement of the bearing relative to the valve needle.

6. The valve needle assembly of claim 5, wherein the first stop is disposed at an end of the valve needle body proximate the threaded rod, the valve needle body being adapted to be configured as a tubular section at the location of the first stop, the first stop being adapted to be formed by a flaring process.

7. The valve needle assembly of claim 6, wherein the outer diameter and wall thickness of the tubular section when un-flared are Φ1 and δ, respectively, wherein 0.2mm +.δ1/4 φ1.

8. The valve needle assembly of claim 6, wherein the tubular section has an outer diameter of Φ2 after flaring, the bearing has an inner diameter of d, and the bearing inner ring has a thickness of t1, d < Φ2++2t1.

9. The valve needle assembly of claim 5, wherein the second stop is configured as a raised ring that projects radially of the valve needle body, the second stop having a width in the radial direction of the valve needle body that is no greater than the thickness of the bearing inner ring.

10. The valve needle assembly of claim 2, further comprising an end cap that is sleeved on the screw and that is fixedly connected to the spring sleeve.

11. The valve needle assembly of claim 10, wherein the screw has a third limit portion adapted to abut an end face of the end cap, the end cap having a fourth limit portion adapted to abut an end face of the spring sleeve.

12. The valve needle assembly of claim 10, wherein the end cap is integrally formed with the screw.

13. An electronic expansion valve comprising a valve seat and a valve needle assembly according to any of claims 1, 5-9, the valve seat having a valve port, the valve needle assembly being axially movable to selectively abut or disengage the valve port.

14. An electronic expansion valve comprising a valve seat and a valve needle assembly according to any of claims 2-4, 10-12, the valve seat having a valve port, the valve needle assembly being axially movable to selectively abut or disengage the valve port, the valve seat having a first guide section adapted to the outer wall of the spring housing to guide axial movement of the spring housing.

15. The electronic expansion valve of claim 14, wherein the height of the first guide section is greater than the height of the spring housing in the axial direction of the valve needle.

16. The electronic expansion valve of claim 14, further comprising a nut assembly secured to said valve seat, a side of said first guide section facing away from said spring housing being adapted to engage an inner wall of said nut assembly to position said nut assembly.

17. The electronic expansion valve of claim 14, wherein the valve seat further has a second guide section adapted to a portion of an outer wall of the valve needle to guide axial movement of the valve needle.

18. A thermal management system comprising an electronic expansion valve according to any of claims 13-17.

19. A vehicle comprising the thermal management system of claim 18.