CN112824689B

CN112824689B - Nut assembly and electronic expansion valve

Info

Publication number: CN112824689B
Application number: CN201911151362.XA
Authority: CN
Inventors: 王鑫楠; 杨剑
Original assignee: Dunan Environment Technology Co Ltd
Current assignee: Dunan Environment Technology Co Ltd
Priority date: 2019-11-21
Filing date: 2019-11-21
Publication date: 2022-05-13
Anticipated expiration: 2039-11-21
Also published as: CN112824689A

Abstract

The invention provides a nut component and an electronic expansion valve, wherein the nut component comprises: a nut seat; the limiting spring is sleeved on the nut seat and provided with a first end and a second end which are oppositely arranged; the stop ring is sleeved on the nut seat, can spirally move relative to the nut seat along the limiting spring and is provided with a stop part; the limiting part is arranged on the nut seat and used for limiting the position of the limiting spring on the nut seat along the axis direction, a limiting part is arranged on the limiting part, the first end of the limiting spring penetrates through the limiting part, and the limiting part and the stopping part are matched to stop the stopping ring. Through the technical scheme that this application provided, can solve the poor problem of backstop positioning accuracy among the prior art.

Description

Nut assembly and electronic expansion valve

Technical Field

The invention relates to the technical field of electronic expansion valves, in particular to a nut assembly and an electronic expansion valve.

Background

Generally, an electronic expansion valve includes a rotor assembly, a nut assembly, a valve needle assembly, and a valve seat, wherein a valve port is disposed on the valve seat, and the rotor assembly is used for driving the valve needle assembly to move so as to control the opening and closing of the valve port.

Wherein, the nut subassembly includes nut seat, spacing spring and backstop circle, and the backstop circle can move on the axis direction of nut seat along spacing spring, and when the backstop circle moved to spacing spring's top and bottom, the backstop circle can paste and lean on spacing spring to backstop and lower backstop in the realization, thereby realize the effect of the number of turns of restriction rotor subassembly.

However, in the prior art, when the stop ring is attached to the limit spring, the limit spring is easy to deform due to the elasticity of the limit spring, resulting in inaccurate positioning. Therefore, the prior art has the problem of poor stop positioning accuracy.

Disclosure of Invention

The invention provides a nut component and an electronic expansion valve, which aim to solve the problem of poor stop positioning accuracy in the prior art.

According to one aspect of the present invention, there is provided a nut assembly comprising: a nut seat; the limiting spring is sleeved on the nut seat and provided with a first end and a second end which are oppositely arranged; the stop ring is sleeved on the nut seat, can spirally move relative to the nut seat along the limiting spring and is provided with a stop part; the limiting part is arranged on the nut seat and used for limiting the position of the limiting spring on the nut seat along the axis direction, a limiting part is arranged on the limiting part, the first end of the limiting spring penetrates through the limiting part, and the limiting part and the stopping part are matched to stop the stopping ring.

Furthermore, the limiting part is of an annular structure, the limiting part is sleeved at the upper end of the nut seat, the limiting spring is abutted against the lower end face of the limiting part, and the limiting part protrudes out of the lower end face of the limiting part.

Furthermore, one side of the limiting part, which faces the nut seat, is provided with a notch, and the first end of the limiting spring is arranged in the notch in a penetrating manner.

Furthermore, a first limiting structure is arranged between the limiting part and the nut seat, and the first limiting structure is used for limiting the axial displacement of the limiting part relative to the nut seat.

Furthermore, the limiting member has an initial position and a limiting position which are relatively arranged, the limiting member can rotate relative to the nut base so as to move between the initial position and the limiting position, when the limiting member is located at the initial position, the limiting member can axially move relative to the nut base, and when the limiting member is located at the limiting position, the limiting member cannot axially move relative to the nut base.

Furthermore, a first limiting groove is formed in the side wall of the nut seat, a notch of the first limiting groove is located in the upper end face of the nut seat, a first limiting boss is arranged on the groove wall of the first limiting groove, an interval is formed between the first limiting boss and the groove bottom of the first limiting groove, a second limiting boss is arranged on the inner wall of the limiting part, when the limiting part is located at the initial position, the second limiting boss corresponds to the notch of the first limiting groove, when the limiting part moves to the limiting position from the initial position, the second limiting boss is located between the first limiting boss and the groove bottom, and the axial movement of the limiting part is limited by the cooperation of the first limiting boss and the second limiting boss.

Further, when the limiting part is located at the limiting position, the limiting spring abuts against the lower end face of the limiting part, and the limiting spring is in a compressed state.

Furthermore, a plurality of first limiting grooves are formed in the side wall of the nut seat, a plurality of second limiting bosses are arranged on the inner wall of the limiting part, and the first limiting grooves and the second limiting bosses are arranged in a one-to-one correspondence mode.

Furthermore, the plurality of first limiting grooves are arranged in a non-centrosymmetric mode.

Furthermore, a second limiting structure is arranged between the limiting part and the nut seat and used for limiting the limiting part to rotate relative to the nut seat.

Furthermore, an avoiding groove and a second limiting groove are formed in the outer wall of the nut seat, the avoiding groove and the second limiting groove are arranged at intervals, a third limiting boss is arranged on the inner wall of the limiting part, when the limiting part is located at the initial position, the third limiting boss corresponds to the avoiding groove, when the limiting part moves to the limiting position from the initial position, the third limiting boss moves to the second limiting groove from the avoiding groove, and the third limiting boss is matched with the second limiting groove to limit the rotation of the limiting part.

Furthermore, the avoiding groove and the second limiting groove extend along the axis direction of the nut seat, and the notches of the avoiding groove and the second limiting groove are located on the upper end face of the nut seat.

Furthermore, the cross section of the second limiting groove comprises a semicircular shape, a U-shaped shape and a triangular shape, and the shape and the size of the third limiting boss are matched with those of the second limiting groove.

According to another aspect of the present invention, there is provided an electronic expansion valve including the nut assembly provided above.

According to the technical scheme, the nut assembly comprises a nut seat, a limiting spring, a stop ring and a limiting piece, wherein the limiting spring and the stop ring are sleeved on the nut seat, the stop ring can spirally move relative to the nut seat along the limiting spring, the limiting piece is arranged on the nut seat, and the limiting piece is used for limiting the position of the limiting spring on the nut seat along the axis direction. Specifically, the limiting spring is provided with a first end and a second end which are oppositely arranged, a limiting part is arranged on the limiting part, and the first end of the limiting spring is arranged on the limiting part in a penetrating mode. By adopting the structure, the first end of the limiting spring can be limited by the limiting part to move in the radial direction of the nut seat, and the limiting spring only plays a role of a sliding rail. And, be provided with backstop portion on the backstop circles, cooperate through spacing portion and backstop portion and can carry out the backstop to the backstop circle, spacing spring only plays the effect of slide rail this moment, and spacing spring can not take place to warp, so can promote the precision of backstop location.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 illustrates an exploded view of a nut assembly provided in accordance with an embodiment of the present invention;

FIG. 2 illustrates yet another exploded view of a nut assembly provided in accordance with an embodiment of the present invention;

fig. 3 is a schematic structural diagram illustrating a position limiting element according to an embodiment of the invention;

fig. 4 is a schematic structural diagram illustrating a position limiting element according to an embodiment of the invention;

fig. 5 shows a schematic structural diagram of the limiting member in fig. 1;

FIG. 6 is a top view of a limiter in an initial position according to an embodiment of the present invention;

FIG. 7 is a top view of a limiter in a limiting position according to an embodiment of the present invention;

FIG. 8 shows a schematic structural view of the nut socket of FIG. 1;

FIG. 9 shows a partial enlarged view at A in FIG. 8;

FIG. 10 is a schematic structural view of a nut assembly provided in accordance with an embodiment of the present invention;

FIG. 11 shows a partial enlarged view at B in FIG. 10;

FIG. 12 illustrates a cross-sectional view of a nut assembly provided in accordance with an embodiment of the present invention;

FIG. 13 is a schematic structural view of a nut assembly provided in accordance with a second embodiment of the present invention;

FIG. 14 shows a partial enlarged view at C in FIG. 13;

FIG. 15 is a further structural schematic view of a nut assembly provided in accordance with a second embodiment of the present invention;

FIG. 16 is a schematic view of the limiter of FIG. 13;

FIG. 17 shows a schematic structural view of the spacing spring of FIG. 13;

FIG. 18 is a schematic structural view of a nut assembly provided in accordance with a third embodiment of the present invention;

fig. 19 is a schematic structural view of a nut assembly according to a fourth embodiment of the present invention.

Wherein the figures include the following reference numerals:

10. a nut seat; 11. a first limit groove; 111. a first limit boss; 12. an avoidance groove; 13. a second limit groove; 14. a limiting hole; 15. an installation part; 151. mounting grooves; 152. a second flange;

20. a limiting spring; 21. a first bending section;

30. a stop ring; 31. a stopper portion;

40. a limiting member; 41. a limiting part; 411. a notch; 412. a first flange; 42. a second limit boss; 43. and a third limiting boss.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 12, a nut assembly according to a first embodiment of the present invention includes a nut base 10, a position-limiting spring 20, a stop ring 30, and a position-limiting member 40. The limiting spring 20 and the stopping ring 30 are sleeved on the nut seat 10, and the limiting spring 20 can be used as a sliding rail when the stopping ring 30 moves, so that the stopping ring 30 moves spirally along the limiting spring 20 relative to the nut seat 10. The limiting member 40 is disposed on the nut seat 10, and the limiting member 40 is used for limiting a position of the limiting spring 20 on the nut seat 10 along an axial direction, so as to prevent the limiting spring 20 from falling off from the nut seat 10. Specifically, the limiting spring 20 has a first end and a second end which are oppositely arranged, the limiting member 40 is provided with a limiting portion 41, the first end of the limiting spring 20 is inserted into the limiting portion 41, the limiting portion 41 can be used to limit the displacement of the first end of the limiting spring 20 in the radial direction of the nut seat 10, and the first end of the limiting spring 20 is in a free state in the circumferential direction of the nut seat 10. Specifically, backstop portion 31 is arranged on backstop ring 30, and spacing portion 41 and backstop portion 31 cooperate and can carry out the backstop to backstop ring 30, and spacing spring 20 only plays the slide rail effect this moment, and spacing spring 20 can not warp, so can promote backstop positioning accuracy.

With the nut component provided in this embodiment, the first end of the limiting spring 20 is inserted into the limiting portion 41, so that the displacement of the first end of the limiting spring 20 in the radial direction of the nut seat 10 can be limited by the limiting portion 41, but the first end of the limiting spring 20 is in a free state in the circumferential direction of the nut seat 10. By adopting the structure, when the stopping ring 30 is stopped by matching the limiting part 41 and the stopping part 31, the limiting spring 20 only plays a role of a sliding rail at the moment, the limiting spring 20 cannot deform, the processing is convenient, and the stopping positioning precision can be improved while the stopping is realized. And moreover, the stop is changed into a hard stop, so that the stop position can be more accurate, and the initial position of the electronic expansion valve is more accurate.

The limiting member 40 stops the stop ring 30, and includes an upper stop and a lower stop of the limiting member 40 on the stop ring 30. The stopper ring 30 may be stopped at an upper end or a lower end by the stopper 40 by disposing the stopper 40 at an upper end or a position near the lower end of the nut socket 10, and the stopper ring 30 may be stopped at an upper end or a lower end by the stopper 40 by disposing the stopper 40 at an upper end or a position near the lower end of the nut socket 10 at the same time.

In the present embodiment, the limiting member 40 is an annular structure, and the limiting spring 20 is abutted against the lower end surface of the limiting member 40 by sleeving the limiting member 40 on the upper end of the nut base 10, so that the position of the limiting spring 20 on the nut base 10 along the axial direction can be limited by the limiting member 40. Specifically, the limiting portion 41 protrudes from the lower end surface of the limiting member 40, and a space is formed between a portion protruding from the lower end surface of the limiting member 40 and the outer wall of the nut seat 10, so that the first end of the limiting spring 20 is inserted into the space, so as to limit the displacement of the first end of the limiting spring 20 in the radial direction of the nut seat 10 by using the limiting portion 41. In the present embodiment, the stopper portion 41 cooperates with the stopping portion 31 to perform an upper stop on the stop ring 30.

Wherein, one side of the limiting part 41 facing the nut seat 10 is provided with a notch 411, and the first end of the limiting spring 20 is inserted into the notch 411. Specifically, the notch 411 is located at an end of the stopper 41. In order to improve the fitting degree between the position-limiting part 41 and the position-limiting spring 20 and prevent the position-limiting part 41 from limiting the displacement of the position-limiting spring 20 in the circumferential direction of the nut holder 10, the shape and size of the notch 411 may be adapted to the shape and size of the end of the position-limiting spring 20. Specifically, the inner wall of the notch 411 may be a curved surface.

In order to prevent the limiting member 40 from falling off from the nut seat 10, a first limiting structure is disposed between the limiting member 40 and the nut seat 10, and the first limiting structure is used for limiting the axial displacement of the limiting member 40 relative to the nut seat 10. Wherein, first limit structure includes spacing boss and spacing recess matched with structure, perhaps pin limit structure, perhaps fastener limit structure.

The limiting member 40 has an initial position and a limiting position, and the limiting member 40 can rotate relative to the nut base 10, so that the limiting member 40 moves between the initial position and the limiting position. Specifically, when the limiting member 40 is located at the initial position, the limiting member 40 can move axially relative to the nut seat 10, and when the limiting member 40 is located at the limiting position, the limiting member 40 cannot move axially relative to the nut seat 10, so that the limiting member 40 can be prevented from falling off from the nut seat 10. In the present embodiment, when the limiting member 40 is rotated, the rotation direction of the limiting member 40 is the same as the upper stop direction.

Specifically, a first limiting groove 11 is formed in a side wall of the nut seat 10, and a notch of the first limiting groove 11 is located on an upper end surface of the nut seat 10. In order to axially limit the limiting member 40, a first limiting boss 111 is disposed on a groove wall of the first limiting groove 11, a gap is formed between the first limiting boss 111 and a groove bottom of the first limiting groove 11, and a second limiting boss 42 is disposed on an inner wall of the limiting member 40. When the limiting member 40 is located at the initial position, the second limiting boss 42 is disposed corresponding to the notch of the first limiting groove 11, and at this time, the second limiting boss 42 is located in the first limiting groove 11. When the limiting member 40 moves from the initial position to the limiting position, the second limiting boss 42 moves between the first limiting boss 111 and the bottom of the groove, and at this time, the first limiting boss 111 and the second limiting boss 42 cooperate to limit the axial movement of the limiting member 40, so as to axially fix the limiting member 40.

In this embodiment, the upper surface of the first limiting protrusion 111 is flush with the upper end surface of the nut seat 10, so that the integrity of the nut seat 10 can be ensured, and the nut seat 10 can be conveniently processed. And, the second limit projection 42 is provided at a lower side of an inner wall of the limit member 40.

When the limiting member 40 is located at the limiting position, the limiting spring 20 abuts against the lower end surface of the limiting member 40, and at this time, the limiting spring 20 is in a compressed state. Under the action of the elastic force of the limiting spring 20, the first limiting boss 111 abuts against the second limiting boss 42, so that the axial limiting effect of the limiting member 40 can be further improved. Specifically, when the limiting member 40 is located at the limiting position, the upper end surface of the limiting member 40 is flush with the upper end surface of the nut seat 10, so that the integrity of the nut assembly can be ensured, and the nut assembly is prevented from blocking the assembly and operation of other components.

When the limiting member 40 is not installed, the limiting spring 20 is in a free state, the limiting spring 20 has a certain extension amount, and at this time, the height of the limiting spring 20 is greater than or equal to the height of the limiting spring 20 after the limiting member 40 is installed on the nut base 10. When the limiting member 40 is mounted on the nut seat 10 and the limiting member 40 is located at the limiting position, the first end of the limiting spring 20 is located in the limiting portion 41, the limiting spring 20 is in a compressed state, and the limiting spring 20 has an elastic force on the limiting member 40, so that the risk of the limiting member 40 vibrating and slipping can be reduced.

In this embodiment, the sidewall of the nut seat 10 is provided with a plurality of first limiting grooves 11, the inner wall of the limiting member 40 is provided with a plurality of second limiting bosses 42, and the plurality of first limiting grooves 11 and the plurality of second limiting bosses 42 are arranged in a one-to-one correspondence manner, so that the limiting effect can be further improved. In this embodiment, two first limiting grooves 11 are disposed on the sidewall of the nut seat 10, and two second limiting bosses 42 are disposed on the inner wall of the limiting member 40.

The first limiting grooves 11 are arranged in a non-centrosymmetric manner, and have the advantages of high stress strength and warping resistance. In other embodiments, a plurality of first limiting grooves 11 may be uniformly distributed on the side wall of the nut seat 10.

In the present embodiment, a second limiting structure is disposed between the limiting member 40 and the nut base 10, and the second limiting structure is used for limiting the rotation of the limiting member 40 relative to the nut base 10. The second limiting structure comprises a limiting boss and a limiting groove matched structure, or a pin limiting structure, or a fastener limiting structure.

Specifically, an avoiding groove 12 and a second limiting groove 13 are arranged on the outer wall of the nut seat 10, and the avoiding groove 12 and the second limiting groove 13 are arranged at intervals. By providing the third limiting boss 43 on the inner wall of the limiting member 40, when the limiting member 40 is located at the initial position, the third limiting boss 43 is disposed corresponding to the avoiding groove 12. Moreover, when the limiting member 40 moves from the initial position to the limiting position, the third limiting boss 43 moves from the avoiding groove 12 to the second limiting groove 13, and at this time, the third limiting boss 43 and the second limiting groove 13 can cooperate to limit the rotation of the limiting member 40, so as to circumferentially fix the limiting member 40. In addition, in the process of sleeving the limiting member 40 on the nut seat 10, the avoiding groove 12 and the third limiting boss 43 can also play a guiding role. In the present embodiment, the limiting member 40 is made of a rigid material. Since the limiting member 40 is of an annular structure, when the limiting member 40 is sleeved on the nut seat 10 to rotate, the limiting member 40 can slightly deform, so that the third limiting boss 43 moves into the second limiting groove 13.

In this embodiment, the avoiding groove 12 and the second limiting groove 13 both extend along the axial direction of the nut seat 10, and the notches of the avoiding groove 12 and the second limiting groove 13 are both located on the upper end surface of the nut seat 10, so that the limiting member 40 is conveniently sleeved on the nut seat 10.

The cross-sectional shape of the second limiting groove 13 includes a semicircle, a U shape, and a triangle, and the shape and size of the third limiting projection 43 are matched with the shape and size of the second limiting groove 13. In the present embodiment, the cross-sectional shape of the second stopper groove 13 is a semicircle.

In this embodiment, the side surface of the avoiding groove 12 close to the second limiting groove 13 is provided with a curved surface, so that the third limiting projection 43 rotates from the avoiding groove 12 to the second limiting groove 13.

In order to further improve the rotation stopping effect of the limiting member 40, a plurality of avoiding grooves 12 and a second limiting groove 13 are arranged on the outer wall of the nut seat 10, a plurality of third limiting bosses 43 are arranged on the inner wall of the limiting member 40, and one third limiting boss 43 is arranged corresponding to one avoiding groove 12 and one second limiting groove 13.

In this embodiment, the material of locating part includes non-metallic material, because backstop ring 30 is the spring wire, nonmetal and metal striking can reduce the backstop noise.

In addition, the limiting spring 20 is not subjected to the stopping force, so that the wire diameter of the limiting spring 20 can be reduced, and the number of rotation turns of the rotor can be adjusted by adjusting the number of turns of the limiting spring 20, that is, the valve needle moving distance of the electronic expansion valve is adjustable, and the flow precision is adjustable. And, limit spring 20 processing is simple, and the size is convenient to control.

In this embodiment, the second end of the limit spring 20 has a first bending section 21, the first bending section 21 is bent along the axial direction of the limit spring 20, the nut seat 10 is provided with a limit hole 14, the first bending section 21 is inserted into the limit hole 14 to limit the circumferential rotation of the limit spring 20, and the mounting portion 15 of the nut seat 10 is matched with the other end of the stop ring away from the stop portion 31 to stop the stop ring 30. Wherein, can set up the balancing hole into spacing hole, so both can utilize the balancing hole to realize the quick pressure balance of valve pocket and nut seat 10, can utilize the balancing hole to carry on spacingly to the second end of spacing spring 20 again.

Specifically, the stop ring 30 has a second bending section, the second bending section is bent toward a direction away from the nut seat, and the second bending section forms the stop portion 31.

In other embodiments, by reversely installing the stop ring 30, the stop portion 31 can cooperate with the installation portion 15 of the nut seat 10 to realize a lower stop, and the end of the stop ring 30 away from the stop portion 31 can cooperate with the limiting portion 41 of the limiting member 40 to realize an upper stop.

As shown in fig. 13 to 17, a second embodiment of the present invention provides a nut assembly, which is different from the first embodiment in that, in the second embodiment, no bent segment is provided at both ends of the limiting spring 20, and an assembling structure is provided on both the limiting portion 41 of the limiting member 40 and the nut seat 10, and the assembling structure can be used to assemble and fix the limiting spring 20 so as to limit the rotation of the limiting spring 20 relative to the nut seat 10.

Specifically, a first rib 412 is disposed at one end of the notch 411 of the limiting portion 41, and the first rib 412 is disposed corresponding to the first end of the limiting spring 20. After the limiting spring 20 is sleeved on the nut seat 10 and the limiting member 40 is assembled on the nut seat 10, the end of the first end of the limiting spring 20 abuts against the first rib 412, so as to limit the first end of the limiting spring 20 in the circumferential direction.

The nut holder 10 is provided with an attachment portion 15, and the attachment portion 15 circumferentially limits the second end of the limit spring 20. Wherein, one side of the mounting portion 15 facing the nut seat 10 is provided with a mounting groove 151, and the second end of the limiting spring 20 is inserted in the mounting groove 151. Specifically, a second rib 152 is disposed at one end of the mounting groove 151, and the second rib 152 is disposed corresponding to an end of the second end of the limiting spring 20. After the limiting spring 20 is sleeved on the nut seat 10, the second end of the limiting spring 20 is located in the mounting groove 151, and the end of the second end of the limiting spring 20 abuts against the second stopper 152, so as to circumferentially limit the second end of the limiting spring 20.

As shown in fig. 18, a third embodiment of the present invention provides a nut assembly, which is different from the first embodiment in that a detachable limiting member 40 is disposed near a lower end of the nut base 10 in the third embodiment, and a limiting portion 41 of the limiting member 40 can perform a lower stop on the stop ring 30.

The limiting member 40 is an annular structure, the limiting member 40 is sleeved on the position of the nut seat 10 near the lower end, a limiting portion 41 is arranged on the limiting member 40, and the limiting portion 41 is arranged towards the limiting spring 20.

Specifically, the position of the upper end surface of the limiting portion 41, which is close to the axis of the nut seat 10, is provided with an accommodating groove, the limiting spring 20 is arranged in the accommodating groove in a penetrating manner, and the limiting portion 41 can radially limit the limiting spring 20. And, set up the holding tank through the up end at spacing portion 41, can promote spacing portion 41's height dimension, so can further guarantee the reliability of backstop down, the phenomenon of slippage appears when avoiding backstop down. The stopper spring 20 can be supported by the stopper 40, and the position of the stopper spring 20 in the axial direction on the nut holder 10 can be regulated.

As shown in fig. 19, a nut assembly according to a fourth embodiment of the present invention is different from the first embodiment in that a detachable limiting member 40 is disposed near a lower end of the nut base 10 in the fourth embodiment, and the limiting member 40 can perform a lower stop on the stop ring 30.

The limiting member 40 is a limiting block, the limiting member 40 is inserted into the nut seat 10, and the limiting portion 41 of the limiting member 40 faces the limiting spring 20.

In other embodiments, the receiving groove on the limiting portion 41 of the nut seat 10 near the lower end position may also be provided with a rib to achieve radial limitation and circumferential limitation of the limiting spring 20.

The fourth embodiment of the invention provides an electronic expansion valve, which comprises the nut component.

The electronic expansion valve further comprises a rotor assembly, a valve needle assembly and a valve seat, wherein the valve seat is provided with a valve port, and the rotor assembly is used for driving the valve needle assembly to move so as to control the opening and closing of the valve port. Specifically, the rotor subassembly includes the rotor and dials the piece, dials the one end of piece and is connected with the rotor, dials the other end of piece and is connected with backstop ring 30, and the rotor rotates and can drive backstop ring 30 axial displacement through dialling the piece, and backstop ring 30 cooperatees with spacing portion 41 on the locating part 40 and goes up the backstop, and backstop ring 30 cooperatees with the installation department 15 on the nut seat 10 and goes on backstop down.

The device provided by the embodiment has the following beneficial effects:

(1) the limiting part 40 is provided with a limiting part 41, the limiting part 41 can prevent the first end of the limiting spring 20 from popping up, and when the limiting part 40 is assembled on the nut seat 10, the pre-tightening force can be increased by rotating the limiting part 40;

(2) by means of the pre-tightening elastic force of the limiting spring 20, the limiting spring 20 can be used for matching with the nut seat 10 and the limiting piece 40 to carry out axial limiting;

(3) the limiting piece 40 is provided with a third limiting boss 43, and the third limiting boss 43 is matched with the second limiting groove 13, so that the limiting piece 40 can be limited to rotate relative to the nut base 10, and the device can be prevented from falling off under the conditions of vibration and the like;

(4) the plurality of first limiting grooves 11 are arranged in a non-centrosymmetric manner, and have the advantages of high stress strength and warping resistance;

(5) the limiting hole 14 on the nut seat 10 can be considered as a balance hole, and the second end of the limiting spring 20 can be fixed while the inside and outside pressure of the nut seat 10 is ensured to be communicated.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … … surface," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A nut assembly, characterized in that said nut assembly comprises:

a nut seat (10);

the limiting spring (20) is sleeved on the nut seat (10), and the limiting spring (20) is provided with a first end and a second end which are oppositely arranged;

the stop ring (30) is sleeved on the nut seat (10), the stop ring (30) can spirally move along the limiting spring (20) relative to the nut seat (10), and a stop part (31) is arranged on the stop ring (30);

the limiting part (40) is arranged on the nut seat (10), the limiting part (40) is used for limiting the position of the limiting spring (20) on the nut seat (10) along the axis direction, a limiting part (41) is arranged on the limiting part (40), the first end of the limiting spring (20) penetrates through the limiting part (41) to limit the displacement of the first end of the limiting spring (20) in the radial direction of the nut seat (10), the first end of the limiting spring (20) is in a free state in the circumferential direction of the nut seat (10), and the limiting part (41) and the stopping part (31) are matched to stop the stopping ring (30).

2. The nut assembly according to claim 1, characterized in that the limiting member (40) is a ring-shaped structure, the limiting member (40) is sleeved on the upper end of the nut seat (10), the limiting spring (20) abuts against the lower end surface of the limiting member (40), and the limiting portion (41) is disposed to protrude from the lower end surface of the limiting member (40).

3. Nut assembly according to claim 1, characterized in that a notch (411) is provided in the side of the retainer part (41) facing the nut seat (10), the first end of the retainer spring (20) being inserted into the notch (411).

4. Nut assembly according to claim 1, characterized in that a first limiting structure is provided between the limiting member (40) and the nut seat (10), for limiting an axial displacement of the limiting member (40) relative to the nut seat (10).

5. The nut assembly according to claim 1, characterized in that said limiting member (40) has an initial position and a limiting position which are arranged relative to each other, said limiting member (40) being rotatable relative to said nut seat (10) for moving said limiting member (40) between said initial position and said limiting position, said limiting member (40) being axially movable relative to said nut seat (10) when said limiting member (40) is in said initial position, said limiting member (40) being non-axially movable relative to said nut seat (10) when said limiting member (40) is in said limiting position.

6. The nut component according to claim 5, characterized in that a first limiting groove (11) is provided on a side wall of the nut holder (10), a notch of the first limiting groove (11) is located at an upper end surface of the nut holder (10), a first limiting projection (111) is provided on a groove wall of the first limiting groove (11), the first limiting projection (111) has a space from a groove bottom of the first limiting groove (11), a second limiting projection (42) is provided on an inner wall of the limiting member (40), the second limiting projection (42) is provided corresponding to the notch of the first limiting groove (11) when the limiting member (40) is located at the initial position, the second limiting projection (42) is located between the first limiting projection (111) and the groove bottom when the limiting member (40) moves from the initial position to the limiting position, the first limiting boss (111) is matched with the second limiting boss (42) to limit the limiting piece (40) to move axially.

7. The nut assembly according to claim 5, characterized in that when the limiting member (40) is located at the limiting position, the limiting spring (20) abuts against the lower end surface of the limiting member (40), and the limiting spring (20) is in a compressed state.

8. The nut assembly according to claim 6, characterized in that a plurality of the first limiting grooves (11) are provided on the side wall of the nut holder (10), a plurality of the second limiting bosses (42) are provided on the inner wall of the limiting member (40), and the plurality of the first limiting grooves (11) and the plurality of the second limiting bosses (42) are provided in one-to-one correspondence.

9. Nut assembly according to claim 8, characterized in that a plurality of said first retaining grooves (11) are arranged non-centrosymmetrically.

10. The nut assembly according to claim 1, characterized in that a second limiting structure is provided between the limiting member (40) and the nut holder (10), the second limiting structure being adapted to limit the rotation of the limiting member (40) relative to the nut holder (10).

11. The nut assembly according to claim 5, characterized in that an avoiding groove (12) and a second limiting groove (13) are disposed on an outer wall of the nut seat (10), the avoiding groove (12) and the second limiting groove (13) are disposed at an interval, a third limiting boss (43) is disposed on an inner wall of the limiting member (40), when the limiting member (40) is located at the initial position, the third limiting boss (43) is disposed corresponding to the avoiding groove (12), when the limiting member (40) moves from the initial position to the limiting position, the third limiting boss (43) is moved from the avoiding groove (12) into the second limiting groove (13), and the third limiting boss (43) cooperates with the second limiting groove (13) to limit the rotation of the limiting member (40).

12. The nut component according to claim 11, characterized in that the avoiding groove (12) and the second limiting groove (13) both extend in the axial direction of the nut seat (10), and the notch of the avoiding groove (12) and the second limiting groove (13) both are located at the upper end face of the nut seat (10).

13. The nut assembly according to claim 11, characterized in that the cross-sectional shape of the second retaining groove (13) includes a semicircular shape, a U-shape, and a triangular shape, and the shape and size of the third retaining projection (43) are adapted to the shape and size of the second retaining groove (13).

14. An electronic expansion valve, characterized in that it comprises a nut assembly according to any of claims 1 to 13.