CN218468281U

CN218468281U - Expansion valve

Info

Publication number: CN218468281U
Application number: CN202222888434.2U
Authority: CN
Inventors: 汤海舰
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2022-10-31
Filing date: 2022-10-31
Publication date: 2023-02-10
Anticipated expiration: 2032-10-31

Abstract

The utility model discloses an expansion valve, expansion valve include shell, case, needle subassembly and screw rod, and the shell has and holds the chamber, and the shell is formed with export and import, and the case sets up in holding the intracavity, and the needle subassembly includes needle and elastic component, and the needle has the needle chamber, and the needle is equipped with the through-hole that communicates with the needle chamber, and the one end of screw rod is equipped with butt portion, and butt portion has the convex cambered surface of axial along the screw rod, cambered surface and elastic component butt, and the screw rod is opened or is closed along the axial of screw rod with case normal running fit the export. From this, elastic component can reduce the influence of the axial force of screw rod transmission to the needle, makes to form the pretightning force between needle and the export through elastic component, avoids needle and export excessive contact and takes place relative rotation, reduces the wearing and tearing of needle rotation to the export and the wearing and tearing of export to the needle, increases the leakproofness of expansion valve and the life of expansion valve when needle and export cooperate.

Description

Expansion valve

Technical Field

The utility model belongs to the technical field of the expansion valve technique and specifically relates to an expansion valve is related to.

Background

The expansion valve is mainly applied to a refrigerating system, the rotation of the rotor is controlled by the electromagnetic coil, and the valve needle is close to or far from the outlet and also opens and closes the outlet through the matching of the screw rod and the nut, so that the flow area of the outlet is adjusted, and the adjustment of the flow of the refrigerant is realized. In the prior art, when the valve needle is sealed in contact with the outlet, in order to make the sealing of the valve needle and the outlet more reliable, an elastic element is usually used to connect the valve needle and the screw rod to form a flexible connection, and the flexible connection can provide pre-tightening force for the valve needle to ensure the sealing of the valve needle and the outlet. If the force directly transmitted to the valve needle by the screw through the elastic member is large, the valve needle is easy to rotate relative to the outlet, so that the valve needle and the outlet are easy to wear due to relative rotation, and the sealing performance of the outlet and the service life of the expansion valve are affected.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the present invention is to provide an expansion valve, which can avoid the abrasion between the valve core and the outlet on the valve seat, and increase the sealing performance of the expansion valve.

According to the utility model discloses expansion valve, include: the valve needle assembly comprises a valve needle and an elastic assembly, the valve needle is provided with a valve needle cavity, the valve needle is provided with a through hole, at least part of the inner wall of the through hole is provided with an internal thread, the valve needle assembly is movably arranged in the containing cavity to open or close the outlet, the valve needle assembly comprises a valve needle and an elastic assembly, the valve needle is provided with the valve needle cavity, the valve needle is provided with a through hole communicated with the valve needle cavity, the elastic assembly is positioned in the valve needle cavity, one end of the screw rod is provided with a butting part, the other end of the screw rod penetrates through the through hole and is provided with an external thread matched with the internal thread, the butting part is provided with a cambered surface protruding along the axial direction of the screw rod, the butting part is positioned in the valve needle cavity and can move along the axial direction of the screw rod, the cambered surface is abutted to the elastic assembly, and the screw rod is in running fit with the valve needle to drive the valve needle assembly to open or close the outlet along the axial direction of the screw rod.

According to the utility model discloses an expansion valve, through setting up the screw rod so that the screw rod drives the elastic component and the needle etc. that end with it and moves along the central axis direction of screw rod, elastic component can reduce the axial force of screw rod transmission to the influence of needle, make through elastic component and form the pretightning force between needle and the export, avoid needle and export excessive contact and take place relative rotation, reduce the needle and rotate wearing and tearing and export the needle to the export, increase the leakproofness of expansion valve and the life of expansion valve when needle and export cooperation.

In some embodiments, the abutment is a ball.

In some embodiments, the through hole includes a first hole section and a second hole section distributed along an axial direction of the screw, the second hole section is communicated with the valve needle cavity, a cross-sectional area of the second hole section is gradually increased along a direction toward the valve needle cavity, and an inner side wall of the second hole section is used for abutting against the abutting portion.

In some embodiments, at least part of the inner side wall of the second bore section is a flat surface for abutment with the abutment.

In some embodiments, the valve needle comprises: the valve needle comprises a valve needle body and a valve needle cover, wherein the valve needle body and the valve needle cover are enclosed to form the valve needle cavity, and the through hole is formed in the valve needle cover.

In some embodiments, the screw comprises a rod part and the abutting part, the radial dimension of the rod part is smaller than the bore diameter of the through hole, and the rod part is fixedly connected with the abutting part.

In some embodiments, the stem portion is integrally formed with the abutment.

In some embodiments, the elastic assembly further comprises: the support piece is arranged between the abutting portion and the elastic piece.

In some embodiments, the support comprises: the valve needle comprises a screw rod, a stop part, a guide part and an elastic piece, wherein one side surface of the stop part facing the screw rod is stopped against the stop part, the guide part is connected to one side of the stop part far away from the screw rod, the cross section area of the guide part is smaller than that of the stop part, the elastic piece is at least partially sleeved on the guide part, and the elastic piece is stopped against between one side surface of the stop part far away from the screw rod and one side inner wall of the valve needle cavity far away from the screw rod.

In some embodiments, a side surface of the abutting portion facing the abutting portion is formed as a flat surface or a curved surface protruding toward the screw.

In some embodiments, a groove is formed on a side surface of the abutting portion facing the abutting portion, and the one end of the screw abuts against an inner wall of the groove.

In some embodiments, the resilient assembly comprises a resilient member, and the abutment portion is in direct contact with the resilient member.

In some embodiments, the expansion valve further comprises: the driving mechanism comprises a stator assembly and a rotor assembly, the stator assembly is located outside the shell, the rotor assembly is arranged in the accommodating cavity and connected with the screw, and when the driving mechanism works, the rotor assembly drives the screw to move relative to the shell under the action of a magnetic field of the stator assembly.

In some embodiments, a rotation stopping limiting structure is arranged on the valve core, a guide groove spirally extending along the axial direction of the valve core is formed on the outer peripheral surface of the valve core, a rotation stopping member is arranged in the guide groove, the rotation stopping member is movable in the guide groove, the driving mechanism drives the rotation stopping member to move in the guide groove in the rotation process of the driving mechanism, and the driving mechanism stops rotating when the rotation stopping member abuts against the rotation stopping limiting structure.

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

Drawings

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

fig. 1 is a schematic view of an expansion valve according to an embodiment of the invention.

Fig. 2 is a schematic view of a valve cartridge according to a first embodiment of the present invention.

Fig. 3 is a schematic three-dimensional split view of a valve cartridge according to a first embodiment of the present invention.

Fig. 4 is a schematic view of a valve cartridge according to a second embodiment of the present invention.

Fig. 5 is a schematic view of a valve cartridge according to a third embodiment of the present invention.

Reference numerals:

an expansion valve 100;

a housing 10; a housing chamber 11;

a valve seat 20; an outlet 21; an inlet 22;

a valve core 30; a valve needle 31; a valve needle cavity 311; a needle cover 312; a through hole 3122; a first bore section 3122a; a second bore section 3122b; a screw 32; a rod portion 321; an external thread 3211; an abutment portion 322; a support member 33; a stopping portion 331; the guide portion 332; a groove 333; a resilient member 34; an elastic member 35;

a rotor assembly 50; a magnet 51; a connecting portion 52; the stopper 53;

a first chamber 61; an internal thread 621; a guide groove 63;

a rotation stop member 70.

Detailed Description

The following detailed description describes embodiments of the present invention, the embodiments described with reference to the drawings are exemplary, and an expansion valve 100 according to an embodiment of the present invention is described with reference to fig. 1 to 5, the expansion valve 100 including: a housing, a cartridge 30, a needle assembly and a screw 32.

Specifically, as shown in fig. 1 to 3, the housing has an accommodating cavity 11, the housing is formed with an outlet 21 and at least one inlet 22, both the outlet 21 and the inlet 22 are communicated with the accommodating cavity 11, the valve element 30 is fixedly disposed in the accommodating cavity 11, the valve element 30 has a through hole, an internal thread is formed on at least a part of an inner wall of the through hole, the valve element includes a valve needle 31 and an elastic component 34, the valve needle 31 has a valve needle cavity 311, the valve needle 31 is provided with a through hole 3122 communicated with the valve needle cavity 311, the elastic component 34 is located in the valve needle cavity 311, one end of the screw 32 is provided with an abutting portion 322, the other end of the screw 32 is provided with the through hole 3122 and is provided with an external thread 3211 matched with the internal thread, the abutting portion 322 has an arc surface protruding toward one end of the outlet 21 along an axial direction of the screw 32, the abutting portion 322 is located in the valve needle cavity 311 and is movable along the axial direction of the screw 32, the arc surface abuts against the elastic component 34, and the screw 32 and the valve element 30 are rotatably matched to drive the valve needle component to open or close the outlet 21 along the axial direction of the screw 32.

It is understood that the housing includes a case 10 and a valve seat 20, one end of the case 10 is open, the valve seat 20 is provided at one end of the case 10, the valve seat 20 and the case 10 define a receiving chamber 11 therebetween, and the valve seat 20 is formed with an inlet 22 and an outlet 21 communicating with the receiving chamber 11. One end of the valve core 30 close to the outlet 21 is fixedly connected with the housing 10, a through hole is formed at one end of the valve core 30 far away from the outlet 21, an abutting part 322 is arranged at one end of the screw rod 32 close to the outlet 21, the abutting part 322 is positioned in the valve needle assembly and connected with the valve needle assembly, and one end of the screw rod 32 far away from the outlet 21 passes through the through hole 3122 and then is matched with the through hole to realize threaded connection. For example, when the screw 32 rotates forward relative to the valve core 30, the screw 32 can drive the valve needle 31 connected thereto to move away from the outlet 21, so as to open the outlet 21, and fluid flows from the inlet 22 to the outlet 21; when the screw 32 rotates reversely relative to the valve element 30, the screw 32 compresses the elastic component 34 through the abutting portion 322 to drive the valve needle 31 to move downwards, so as to close the outlet 21. The end of the abutting part 322 adjacent to the outlet is formed into a convex arc surface, the abutting part 322 is contacted with the end of the elastic component 34 far away from the outlet through the arc surface, the arc surface and the elastic component 34 can realize point contact or line contact, and the contact stability of the screw 32 and the elastic component 34 can be ensured. Meanwhile, reducing the contact area between the abutting portion 322 and the elastic component 34 allows the axial force of the screw 32 to be transmitted to the elastic component 34 and the valve needle 31 during the rotation of the screw 32, so that the elastic component 34 and the valve needle 31 move along the central axis direction of the screw 32, and the valve needle 31 and the elastic component 34 do not rotate along with the rotation of the screw 32.

According to the utility model discloses expansion valve 100, through setting up screw rod 32 so that screw rod 32 drives elastic component 34 and needle 31 etc. that the end was supported with it and moves along screw rod 32's the central axis direction, elastic component 34 can reduce the influence of the axial force of screw rod 32 transmission to needle 31, make through elastic component 34 and form the pretightning force between needle 31 and the export 21, avoid needle 31 and export 21 excessive contact and take place relative rotation, reduce the wearing and tearing of needle 31 rotation to export 21 and the wearing and tearing of export 21 to needle 31, increase the leakproofness of expansion valve 100 and the life of expansion valve 100 when needle 31 cooperates with export 21.

In some embodiments, as shown in fig. 3-5, the abutment 322 is a ball head. That is, a part of the abutting portion 322 is connected to the rod portion 321, another part of the protruding rod portion 321 is disposed toward the outlet 21, and a part of the outer surface of the protruding rod portion 321 is shaped as a spherical surface, and the spherical surface abuts against a side surface of the elastic component 34 adjacent to the screw 32. Specifically, in fig. 5, one end of the stopping portion adjacent to the outlet 21 is a spherical surface. Therefore, the spherical outer surface of the portion of the abutting portion 322 adjacent to the outlet 21 can facilitate increasing the stability of the elastic component 34 when being matched with the abutting portion 322, facilitate the rotation of the screw 32 relative to the elastic component 34, and reduce the possibility of the screw 32 being deviated relative to the elastic component 34 in the radial direction of the screw 32. Meanwhile, the abutting portion 322 is in line contact with one end of the valve needle 31 away from the outlet 21, so that the contact area between the valve needle 31 and the screw 32 is reduced, the friction force generated during the contact is reduced, and the acting force of the screw 32 on the valve needle 31 is reduced.

In some embodiments, referring to fig. 3, the through hole 3122 includes a first hole section 3122a and a second hole section 3122b distributed along the axial direction of the screw 32, wherein the second hole section 3122b communicates with the valve needle cavity 311, the cross-sectional area of the second hole section 3122b gradually increases in a direction toward the valve needle cavity 311, and an inner sidewall of the second hole section 2122b is configured to abut against the abutment 322. Therefore, when the contact portion 322 is fitted into the through hole 3122, friction generated when the contact portion 322 rotates with respect to the through hole 3122 can be reduced, abrasion between the contact portion 322 and the needle 31 can be avoided, and the sealing performance inside the needle 31 can be improved. Simultaneously, second hole section 3122b can increase the spacing to butt joint portion 322, guarantees butt joint portion 322 and through-hole 3122 complex stability, and the butt joint portion 322 of being convenient for cooperates in through-hole 3122.

In some embodiments, at least a portion of the inner sidewall of the second aperture section 3122b is planar, for example, the inner sidewall of the second aperture section 3122b includes a plurality of sub-walls which extend obliquely in the axial direction of the screw 32 toward a direction away from the center of the expansion valve 100, and the plurality of sub-walls are arranged in sequence in the circumferential direction of the screw 32. Therefore, at least part of the inner side wall of the second hole section 3122b is a plane, the abutting portion 322 is in point contact with the through hole 3122, the contact area between the abutting portion 322 and the through hole 3122 can be reduced, and the abrasion of the joint between the abutting portion 322 and the through hole 3122 when the screw 32 rotates can be reduced.

In some embodiments, as shown in fig. 1 and 2, valve needle 31 comprises: the valve needle cover 312 is provided with a valve needle body and a valve needle cover 312, the valve needle body and the valve needle cover 312 enclose to form a valve needle cavity 311, and the through hole 3122 is formed on the valve needle cover 312. One end of the valve needle cavity 311 far away from the outlet 21 forms a through hole 3122, and the arrangement of the second hole section 3122b facilitates the contact of the valve needle cover 312 and the abutting portion 322, so as to limit the abutting portion 322. Alternatively, an end of the needle chamber 311 remote from the outlet 21 is open, an end of the needle chamber 311 remote from the outlet 21 is provided with a needle cover 312, the needle cover 312 is engaged with the needle chamber 311, and a through hole 3122 may be formed on the needle cover 312. Therefore, the valve needle 31 defines a valve needle cavity 311 for accommodating the elastic component 34 and the abutting portion 322, and the valve needle cover 312 is provided with a through hole 3122 for allowing the rod portion 321 to pass through to connect with the abutting portion 322 to drive the valve needle 31 to move.

In some embodiments, as shown in fig. 2 and 3, the screw 32 includes a rod portion 321 and an abutting portion, and the radial dimension of the rod portion 321 is smaller than the bore diameter of the through hole 3122. The screw 32 includes: the valve needle cavity 311 is provided with a rod part 321 and an abutting part 322, one end of the rod part 321 penetrates through the through hole 3122 to extend into the valve needle cavity 311, the abutting part 322 is connected to one end of the rod part 321, the abutting part 322 is located in the valve needle cavity 311, and the maximum cross-sectional area of the abutting part 322 is larger than that of the through hole 3122 to prevent the abutting part 322 from being separated from the valve needle cavity 311. That is, the elastic component 34 and the abutting portion 322 are both located in the valve needle cavity 311 defined by the valve needle 31 and the valve needle cover 312, the rod portion 321 passes through the through hole 3122 to connect with the abutting portion 322 and is stopped against the elastic component 34 by the abutting portion 322, and since the maximum cross-sectional area of the abutting portion 322 is larger than that of the through hole 3122, when the screw 32 moves upward, the abutting portion 322 can contact with the valve needle cover 312 under the stop of the elastic component 34 and bring the valve needle 31 to move upward together to open the outlet 21. Therefore, the radial dimension of the rod portion 321 is smaller than the radial dimension of the through hole 3122 so that the screw 32 can drive the valve needle 31 to move up and down to open and close the outlet 21 when moving up and down, the synchronism of the movement of the valve needle 31 and the screw 32 in the central axis direction of the screw 32 is maintained, the integrity of the screw 32 and the valve core 30 is improved, the contact area of the abutting portion 322 and the elastic component 34 is reduced, and the force in the circumferential direction of the screw 32 is prevented from being transmitted to the valve needle 31.

The rod 321 is fixedly connected to the abutting portion 322, and the fixing connection may be welding. For example, the abutting portion 322 is disposed in the valve needle cavity 311, and one end of the rod portion 321 adjacent to the abutting portion 322 extends into the valve needle cavity 311 through the through hole 3122 of the valve needle cover 312 to be fixedly connected with the abutting portion 322, so that the rod portion 321 and the abutting portion 322 are fixed to move together as a whole. Thus, the rod 321 and the contact portion 322 are fixedly connected, the rod 321 and the contact portion 322 connected to each other can be manufactured separately, the manufacturing cost of the rod 321 and the contact portion 322 can be reduced, the installation of the screw 32 can be facilitated, and the installation efficiency can be improved.

In some embodiments, as shown in fig. 4, the stem portion 321 is integrally formed with the abutment portion 322. Thus, the rod 321 and the abutment 322, which are manufactured by an integral molding process, can increase the structural strength and torsional rigidity of the screw 32, increase the service life of the screw 32, and improve the structural quality of the expansion valve 100.

Further, the expansion valve 100 includes: and the cushion block is arranged between the elastic component 34 and the inner wall of the side of the valve needle cavity 311 far away from the screw 32. For example, the cushion block is disposed between the elastic component 34 and the valve needle cavity 311, and the elastic component 34 is stopped against the cushion block, so that friction between the elastic component 34 and the cushion block and between the cushion block and the valve needle 31 can be increased, so that the cushion block is not easy to rotate relative to the valve needle 31, and therefore, under the condition that the contact area of the screw 32 and the support 33 is small and the generated friction is small, the force in the circumferential direction of the screw 32 can be further ensured not to be transmitted to the support 33 when the valve needle 31 closes the outlet 21. Therefore, a cushion block is arranged between the elastic component 34 and the inner wall of the valve needle cavity 311 on the side far away from the screw rod 32, the contact area between the cushion block and the inner wall of the valve needle cavity 311 can be increased, friction is increased, the contact area between the matched screw rod 32 and the support piece 33 is small, the generated friction force is small, the valve needle 31 cannot rotate relative to the outlet 21 while the rotation of the screw rod 32 is further ensured, the abrasion of the outlet 21 caused by the rotation of the valve needle 31 is avoided, the sealing performance when the outlet 21 is closed is increased, and the service life of the expansion valve 100 is prolonged.

In some embodiments, as shown in fig. 1-5, the elastic assembly 34 includes: an elastic member 35, a support member 33, the support member 33 being disposed between an end of the screw rod 32 adjacent to the outlet 21, i.e., the abutting portion 322, and the elastic member 35. One end of the supporting member 33 away from the outlet 21 abuts against the screw 32, one end of the supporting member 33 adjacent to the outlet 21 abuts against the elastic member 35, and one end of the elastic member 35 away from the outlet 21 can be sleeved on the supporting member 33. Therefore, the support 33 can increase the stability of the abutment between the screw 32 and the support 33, and facilitate the installation of the elastic element 35, so that the elastic element 35 can be installed in the needle cavity 311 more stably, and the axial and circumferential forces transmitted to the needle 31 when the screw 32 rotates can be reduced. The support member 33 can move along the inner wall of the valve needle cavity 311 in cooperation with the inner wall of the valve needle cavity 311, so that the stability of the valve needle 31 during moving up and down is increased, and the valve core 30 has higher compactness and better reliability.

In some embodiments, one of the abutting portion 322 and the surface of the support 33 contacting each other is formed as a convex surface, and the other is formed as a flat surface or a concave surface. For example, as shown in fig. 2, a portion of the screw rod 32 adjacent to the support 33 is formed with a convex surface, and a portion of the support 33 adjacent to the screw rod 32 is formed with a concave surface, so that the assembly and the limit between the screw rod 32 and the support 33 are realized through the cooperation of the concave surface and the convex surface, and the contact area is reduced, thereby reducing the friction between the screw rod 32 and the support 33. Alternatively, as shown in fig. 5, the end of the screw 32 adjacent to the supporting member 33 is convex, the surface of the supporting member 33 is a plane, and the convex surface is stopped against the plane to realize point contact. Therefore, one of the surfaces of the screw rod 32 and the support 33 contacting each other is convex and the other is curved or flat, so that the rotation of the screw rod 32 on the surface of the support 33 and the movement of the valve needle 31 in the direction of the central axis of the screw rod 32 are facilitated, the friction between the screw rod 32 and the support 33 is reduced, the abrasion of the outlet 21 caused by the rotation of the support 33, the elastic part 35 and the valve needle 31 driven by the screw rod 32 is avoided, and the service life of the expansion valve 100 is prolonged.

Alternatively, as shown in fig. 2 to 4, the support 33 includes: the check part 331 and the guide part 332, a side surface of the check part 331 facing the screw rod 32 is checked against one end of the screw rod 32, the guide part 332 is connected to a side of the check part 331 far away from the screw rod 32, a cross-sectional area of the guide part 332 is smaller than that of the check part 331, the elastic member 35 is at least partially sleeved on the guide part 332, and the elastic member 35 is checked between a side surface of the check part 331 far away from the screw rod 32 and an inner wall of the valve needle cavity 311 far away from the screw rod 32.

When the screw 32 moves upwards, the elastic part 35 drives the support part 33 to move upwards, the downward extrusion force applied to the valve needle 31 is reduced, and the valve needle 31 moves upwards to open the outlet 21; when the screw rod 32 moves downwards, the abutting part 322 of the screw rod 32 abuts against the abutting part 331 and gives a downward axial force to the abutting part 331, so that the elastic element 35 is compressed, and the valve needle 31 abutting against the elastic element 35 moves downwards to close the outlet 21. In the stroke of the valve needle 31 from the opening position to the closing position, the elastic element 35 is always in a compressed state, so that a pre-tightening force can be formed, the support element 33 is conveniently limited between the screw 32 and the bottom wall of the valve needle 31, the support element 33 is prevented from generating an empty stroke in the valve needle cavity 311, the accuracy of opening and closing of the outlet 21 is prevented from being influenced, and the sealing performance between the outlet 21 and the valve needle 31 during closing is improved. Meanwhile, the elastic member 35 may have a buffering function, so as to avoid hard contact between the screw 32 and the support member 33, and between the valve needle 31 and the outlet 21, thereby increasing protection of the valve element 30 and a service life of the expansion valve 100.

In the example shown in fig. 3, a groove 333 is formed on a surface of the abutting portion 331 facing the screw rod 32, and one end of the screw rod 32 abuts against an inner wall of the groove 333. The surface of one side of the stopping part 331 facing the screw 32 is formed with a groove 333, the groove 333 is recessed along the central axis of the screw 32 in the direction away from the screw 32, the surface of the abutting part 322 engaged with the groove 333 may be a spherical surface, and the groove 333 forms a limit for the abutting part 322, so that the abutting part 322 is engaged with the support 33 with good reliability.

In some embodiments, the elastic assembly 34 includes an elastic member 35, and the abutting portion 322, i.e., the end of the screw 32 adjacent to the outlet 21, is in direct contact with the elastic member 35. That is, the end of the elastic member 35 away from the outlet 21 abuts against the abutting portion of the screw 32, and may be in point contact or surface contact. Therefore, the abutting portion 322 is in direct contact with the elastic member 35, so that the possibility that the elastic member 35 rotates together with the screw 32 when the screw 32 rotates can be reduced, the valve needle 31 is prevented from rotating together with the screw 32, and the abrasion of the joint of the valve needle 31 and the outlet 21 is reduced.

The expansion valve 100 further comprises: and the driving mechanism comprises a stator assembly (not shown) and a rotor assembly 50, the stator assembly is positioned outside the shell 10, the rotor assembly 50 is arranged in the accommodating cavity 11, the rotor assembly 50 is connected with the screw 32, and when the driving mechanism works, the rotor assembly 50 drives the screw 32 to move relative to the shell 10 under the action of a magnetic field of the stator assembly. The stator assembly may include a driving motor having a stator coil, and a controller, which may send a pulse driving signal to the stator coil when being powered on, so that the stator coil generates a magnetic field that periodically changes, thereby controlling the rotor assembly 50 disposed inside the housing 10 to rotate in forward or reverse directions about the central axis of the screw 32 by the change of the magnetic field. The rotor assembly 50 includes a magnet 51, a connecting portion 52 and a stopper 53, wherein the magnet 51 is disposed along an inner circumferential surface of the housing 10, the connecting portion 52 is disposed at an end of the screw 32 away from the valve seat 20 and is sleeved on the screw 32 and fixedly connected with the screw 32, an outer circumferential edge of the connecting portion 52 abuts against a side of the magnet 51 adjacent to the screw 32 and can rotate along with the magnet 51, so as to drive the screw 32 to rotate to realize movement of the screw 32 in the central axis direction. One end of the stopper 53 is connected to the connecting portion 52, and the other end of the stopper 53 extends toward the valve seat 20 along the central axis of the screw 32.

In some embodiments, the valve core 30 is provided with a rotation stopping limiting structure, a guide groove 63 spirally extending along the axial direction of the valve core 30 is formed on the outer peripheral surface of the valve core 30, a rotation stopping member 70 is arranged in the guide groove 63, the rotation stopping member 70 is movable in the guide groove 63, the driving mechanism drives the rotation stopping member 70 to move in the guide groove 63 during the rotation process of the driving mechanism, and the driving mechanism stops rotating when the rotation stopping member 70 abuts against the rotation stopping limiting structure.

The valve core 30 is disposed between the screw 32 and the magnet 51, one end of the valve core 30 away from the connecting portion 52 is connected with the outer side wall of the valve seat 20, the valve core 30 includes a first chamber 61 and a second chamber (not shown), at least part of the valve core 30 is located in the first chamber 61, and the screw 32 passes through the first chamber 61 and the second chamber to be connected with the connecting portion 52. The outer peripheral surface of one end of the valve element 30 adjacent to the valve seat 20 is connected to the valve seat 20 through a stopper to fix the valve element 30. The inner wall of the second chamber is provided with an internal thread 621, the outer peripheral surface of the rod portion 321 is provided with an external thread 3211, the rod portion 321 can be in threaded fit with the valve core 30, and the rod portion 321 can move up and down along the valve core 30. The outer peripheral surface of the second chamber portion of the valve core 30 is provided with a guide groove 63, the guide groove 63 extends spirally on the outer peripheral surface along the central axis, the guide groove 63 is matched with a rotation stopping member 70, and the rotation stopping member 70 moves along the guide groove 63 in the direction of the central axis. The rotation stop limit structure can limit the moving stroke range of the rotation stop member 70, increase the protection of the valve core 30 and prevent the rotation stop member 70 from separating from the guide groove 63.

In the description of the present invention, it is to 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", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features. In the description of the present invention, "a plurality" means two or more. In the description of the present invention, the first feature "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features being in contact with each other not directly but through another feature therebetween. In the description of the invention, the first feature being "on", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

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

Claims

1. An expansion valve, comprising:

a housing having a receiving cavity, the housing formed with an outlet and at least one inlet, both the outlet and the inlet communicating with the receiving cavity;

the valve core is fixedly arranged in the accommodating cavity and provided with a through hole, and at least part of the inner wall of the through hole is provided with an internal thread;

the valve needle assembly is movably arranged in the accommodating cavity and comprises a valve needle and an elastic assembly, the valve needle is provided with a valve needle cavity, the valve needle is provided with a through hole communicated with the valve needle cavity, and the elastic assembly is positioned in the valve needle cavity;

the valve needle comprises a screw rod, wherein one end of the screw rod is provided with a butting part, the other end of the screw rod penetrates through the through hole and is provided with an external thread matched with the internal thread, the butting part is provided with an arc surface protruding along the axial direction of the screw rod, the butting part is positioned in the valve needle cavity and can move along the axial direction of the screw rod, the arc surface is abutted against the elastic component, and the screw rod is matched with the valve core in a rotating mode so as to drive the valve needle component to open or close the outlet along the axial direction of the screw rod.

2. An expansion valve according to claim 1, wherein the abutment is a ball head.

3. An expansion valve according to claim 2, wherein the through-hole comprises a first hole section and a second hole section distributed in an axial direction of the screw, the second hole section communicating with the needle chamber, a cross-sectional area of the second hole section gradually increasing in a direction toward the needle chamber, an inner side wall of the second hole section being adapted to abut against the abutting portion.

4. An expansion valve according to claim 3, wherein at least part of an inner side wall of the second bore section is planar for abutment with the abutment.

5. An expansion valve according to claim 1, wherein the valve needle comprises: the valve needle comprises a valve needle body and a valve needle cover, wherein the valve needle body and the valve needle cover are enclosed to form the valve needle cavity, and the through hole is formed in the valve needle cover.

6. An expansion valve according to claim 1, wherein the screw comprises a rod part and the abutment part, the rod part having a radial dimension smaller than the bore diameter of the through-hole, the rod part being fixedly connected to the abutment part.

7. An expansion valve according to claim 6, wherein the stem portion is integrally formed with the abutment portion.

8. An expansion valve according to any of claims 1-7, wherein the resilient member comprises:

an elastic member;

a support member disposed between the abutting portion and the elastic member.

9. An expansion valve according to claim 8, wherein the support comprises:

the surface of one side of the stopping part facing the screw is stopped against the abutting part;

the guide part is connected to one side, far away from the screw rod, of the abutting part, the cross section area of the guide part is smaller than that of the abutting part, the elastic piece is at least partially sleeved on the guide part, and the elastic piece abuts between the surface, far away from the screw rod, of one side of the abutting part and the inner wall, far away from the screw rod, of the valve needle cavity.

10. An expansion valve according to claim 9, wherein a surface of the abutting portion on a side facing the abutting portion is formed as a flat surface or a curved surface protruding toward the screw.

11. An expansion valve according to claim 9, wherein a groove is formed on a surface of the abutting portion on a side facing the abutting portion, and the one end of the screw abuts against an inner wall of the groove.

12. An expansion valve according to claim 8, wherein the resilient assembly comprises a resilient member, the abutment being in direct contact with the resilient member.

13. An expansion valve according to claim 8, further comprising:

the driving mechanism comprises a stator assembly and a rotor assembly, the stator assembly is located outside the shell, the rotor assembly is arranged in the accommodating cavity and connected with the screw rod, and when the driving mechanism works, the rotor assembly drives the screw rod to move relative to the shell under the action of a magnetic field of the stator assembly.

14. The expansion valve according to claim 13, wherein the valve element is provided with a rotation stop structure, a guide groove spirally extending along an axial direction of the valve element is formed on an outer circumferential surface of the valve element, a rotation stop member is disposed in the guide groove, the rotation stop member is movable in the guide groove, the driving mechanism drives the rotation stop member to move in the guide groove during rotation of the driving mechanism, and the driving mechanism stops rotating when the rotation stop member abuts against the rotation stop structure.