CN114458773B

CN114458773B - Electronic expansion valve

Info

Publication number: CN114458773B
Application number: CN202011135377.XA
Authority: CN
Inventors: 曾庆军; 陈勇好
Original assignee: Dunan Environment Technology Co Ltd
Current assignee: Dunan Environment Technology Co Ltd
Priority date: 2020-10-21
Filing date: 2020-10-21
Publication date: 2024-03-29
Anticipated expiration: 2040-10-21
Also published as: CN114458773A

Abstract

The present invention provides an electronic expansion valve, comprising: a housing having a valve port; a rotor assembly rotatably disposed within the housing; the nut seat is arranged in the shell, and the lower end of the nut seat is close to the valve port; the valve needle is arranged in the nut seat in a penetrating way and is in threaded connection with the nut seat, and the rotor assembly is in driving connection with the valve needle so as to drive the valve needle to rotate relative to the nut seat; the upper stop structure is fixedly arranged at one end of the valve needle close to the valve port and is positioned between the nut seat and the valve port so as to limit the maximum distance of the valve needle relative to the valve port. Through the technical scheme that this application provided, the rotor subassembly structure among the prior art is complicated problem can be solved.

Description

Electronic expansion valve

Technical Field

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

Background

At present, the electronic expansion valve comprises a shell, a rotor assembly, a nut seat, a screw rod and a valve needle, wherein the rotor assembly is rotatably arranged in the shell, the nut seat is fixedly arranged in the shell, the screw rod is arranged in the nut seat in a penetrating manner and is in threaded fit with the nut seat, the rotor assembly is connected with the screw rod in a driving manner, and the screw rod is connected with the valve needle in a driving manner. Under the drive of the rotor component, the screw rod can be utilized to drive the valve needle to move relative to the valve port on the shell, so that the valve opening and closing operation is realized.

In order to limit the minimum distance and the maximum distance of the valve needle relative to the valve port, an upper stop structure and a lower stop structure are arranged at the upper ends of the rotor assembly and the nut seat, the maximum distance of the valve needle relative to the nut seat can be limited by the upper stop structure, and the minimum distance of the valve needle relative to the nut seat can be limited by the lower stop structure.

However, since the upper stop structure and the lower stop structure are both disposed between the rotor assembly and the nut seat, the rotor assembly itself has a large volume and a complex structure. Therefore, the prior art has a problem of complicated rotor assembly structure.

Disclosure of Invention

The invention provides an electronic expansion valve, which aims to solve the problem of complex structure of a rotor assembly in the prior art.

The invention provides an electronic expansion valve, which comprises: a housing having a valve port; a rotor assembly rotatably disposed within the housing; the nut seat is arranged in the shell, and the lower end of the nut seat is close to the valve port; the valve needle is arranged in the nut seat in a penetrating way and is in threaded connection with the nut seat, and the rotor assembly is in driving connection with the valve needle so as to drive the valve needle to rotate relative to the nut seat; the upper stop structure is fixedly arranged at one end of the valve needle close to the valve port and is positioned between the nut seat and the valve port so as to limit the maximum distance of the valve needle relative to the valve port.

By applying the technical scheme of the invention, the electronic expansion valve comprises a shell, a rotor assembly, a nut seat, a valve needle and an upper stop structure. When the rotor component rotates relative to the shell, the rotor component can drive the valve needle to rotate relative to the nut seat, and the valve needle can axially move while rotating due to the threaded cooperation of the valve needle and the nut seat, so that the relative distance between the valve needle and the valve port can be adjusted, and further the operation of the switching valve is realized. The upper stop structure is fixedly arranged at one end of the valve needle, which is close to the valve port, and is positioned between the nut seat and the valve port, the maximum distance of the valve needle relative to the valve port is limited by the upper stop structure, and the upper stop structure between the rotor assembly and the upper end of the nut seat can be canceled, so that the structure of the rotor assembly can be simplified, and the volume of the rotor assembly can be reduced.

Further, go up the backstop structure and include the backstop piece, the backstop piece sets up on the needle, and the lower terminal surface of nut seat is provided with first backstop boss on, backstop piece and the spacing cooperation of backstop boss on first. In the process that the valve needle rotates relative to the nut seat and moves axially, if the valve needle moves to the contact of the stop block and the first upper stop boss, the valve needle can be limited to continue to rotate under the combined action of the stop block and the first upper stop boss at the moment, and then the upper stop of the valve needle is realized.

Further, the upper end face of the stop block is provided with a second upper stop boss, and the second upper stop boss is in limit fit with the first upper stop boss. In the process that the valve needle rotates relative to the nut seat and moves axially, the second upper stop boss is abutted against the first upper stop boss, so that the valve needle can be limited to continue to rotate, and further the upper stop of the valve needle is realized.

Further, the valve needle is provided with a threaded section in threaded fit with the nut seat, and the stop block is sleeved on the threaded section and in threaded fit with the threaded section. The stop block is assembled on the valve needle by adopting threaded fit, and the valve needle has the advantages of simple structure and convenience in assembly.

Further, the valve needle is provided with a limiting boss, and the limiting boss is matched and abutted with the lower end face of the stop block so as to limit the position of the stop block on the valve needle and prevent the stop block from falling off the valve needle. When the stop block is required to be assembled on the valve needle, the stop block is sleeved on the valve needle, then the stop block is rotated, and the stop block is rotated to be in contact with the limit boss by utilizing threaded fit, so that the stop block can be assembled.

Further, the electronic expansion valve further comprises a lower stop structure, wherein the lower stop structure is arranged between the rotor assembly and the upper end of the nut seat so as to limit the minimum distance between the valve needle and the valve port and prevent the valve needle from impacting the valve port in the valve closing process.

Further, the rotor assembly includes a magnetic member drivingly connected to the stopper and a retainer drivingly connected to the needle, and a lower stop structure disposed between the stopper and the nut seat. In the process of rotating the magnetic part, the magnetic part can drive the valve needle to rotate by utilizing the stopper, so that the valve opening and closing operation is realized. The lower stop structure is arranged between the stopper and the nut seat, so that the lower stop structure is convenient to process.

Further, the upper end face of the nut seat is provided with a first lower stop boss, the lower end face of the stopper is provided with a second lower stop boss, and the first lower stop boss and the second lower stop boss are matched to form a lower stop structure. When the retainer and the valve needle move to the valve-closing position, the retainer contacts with the first lower stop boss on the nut seat by the second lower stop boss, so that the valve needle is limited to continue to rotate and axially move.

Further, the rotor assembly further comprises a connecting sleeve, the connecting sleeve is arranged in the retainer in a penetrating mode and connected with the retainer, and the valve needle is arranged in the connecting sleeve in a penetrating mode and connected with the connecting sleeve. Through setting up the adapter sleeve, be convenient for realize the connection of stopper and needle.

Further, the retainer and the connecting sleeve are injection molded to realize the connection of the retainer and the connecting sleeve; the outer wall of the connecting sleeve is provided with a limiting groove, the limiting groove extends along the circumferential direction of the connecting sleeve, the stopper is clamped in the limiting groove to limit the axial position of the connecting sleeve relative to the stopper, the connecting sleeve is prevented from being separated from the stopper, and/or a rotation stopping structure is arranged between the connecting sleeve and the stopper to limit the rotating of the connecting sleeve relative to the stopper, so that the connecting sleeve is ensured to smoothly transmit torque to the valve needle, and further smooth rotation and axial movement of the valve needle are ensured.

Further, the retainer and the magnetic piece are formed by injection molding, the inner wall of the magnetic piece is provided with a mounting groove, the retainer is inserted into the mounting groove, and the retainer is of a non-circular structure so as to limit the rotation of the retainer relative to the magnetic piece, and further ensure that the magnetic piece smoothly transmits torque to the retainer.

Further, the upper end face of the nut seat is also provided with a reference boss, the reference boss is positioned at one side of the first lower stop boss, and the reference boss is lower than the first lower stop boss. The reference boss is used as a height reference surface of the second lower stop boss, so that the second lower stop boss can be prevented from directly contacting with the upper surface of the nut seat due to machining errors, and the second lower stop boss can be guaranteed to smoothly rotate to be attached to the first lower stop boss.

Further, the lower terminal surface of nut seat is provided with first backstop boss, and the up end of nut seat is provided with first backstop boss down, and the side of first backstop boss down all are provided with the backstop face, and the needle has the screw thread section with nut seat screw-thread fit, and the pitch of screw thread section is between 0.5 to 0.7 with the high dimension's of backstop face ratio. The first upper stop boss can be attached to the second upper stop boss through a stop surface, and the first lower stop boss can be attached to the second lower stop boss through a stop surface, so that upper stop and lower stop are realized. The ratio of the pitch of the thread section to the height dimension of the stop surface is set in the range, so that the stop stability of the upper stop and the lower stop can be ensured.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

fig. 1 shows a cross-sectional view of an electronic expansion valve in a fully closed state provided according to an embodiment of the present invention;

fig. 2 shows a cross-sectional view of an electronic expansion valve provided according to an embodiment of the present invention in a fully open state;

FIG. 3 shows a schematic structural view of the stopper in FIG. 1;

fig. 4 shows a schematic structural view of the valve needle of fig. 1;

FIG. 5 shows a cross-sectional view of the nut seat of FIG. 1;

FIG. 6 shows a schematic structural view of the nut seat of FIG. 1;

fig. 7 shows an assembly view of the stopper and the connection sleeve of fig. 1;

fig. 8 shows a cross-section of the stopper and the connection sleeve of fig. 1;

fig. 9 shows a schematic structural view of the stopper in fig. 1.

Wherein the above figures include the following reference numerals:

10. a housing; 11. a valve port; 20. a rotor assembly; 21. a magnetic member; 211. a mounting groove; 22. a stopper; 221. a second lower stop boss; 23. connecting sleeves; 231. a limit groove; 30. a nut seat; 31. a first upper stop boss; 32. a first lower stop boss; 33. a reference boss; 40. a valve needle; 41. a threaded section; 42. a limit boss; 50. an upper stop structure; 51. a stop block; 511. a second upper stop boss; 60. a lower stop structure; 70. a rotation stopping structure; 80. a stop surface.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1 and 2, an embodiment of the present invention provides an electronic expansion valve comprising a housing 10, a rotor assembly 20, a nut seat 30, a valve needle 40, and an upper stop structure 50. Wherein the housing 10 has a valve port 11, and the valve needle 40 is axially movable within the housing 10 to open or close the valve port 11. Specifically, the rotor assembly 20 is rotatably disposed in the housing 10, the nut seat 30 is fixedly disposed in the housing 10, the lower end of the nut seat 30 is disposed near the valve port 11, the valve needle 40 is threaded in the nut seat 30 and is in threaded connection with the nut seat 30, the rotor assembly 20 is in driving connection with the valve needle 40, when the rotor assembly 20 rotates, the rotor assembly 20 drives the valve needle 40 to rotate relative to the nut seat 30, and the valve needle 40 axially moves while rotating due to threaded engagement of the valve needle 40 and the nut seat 30, so that the valve port 11 can be opened or plugged by using the valve needle 40. In the present embodiment, the upper stop structure 50 is fixedly disposed at one end of the valve needle 40 near the valve port 11 and between the nut seat 30 and the valve port 11 to limit the maximum distance of the valve needle 40 relative to the valve port 11, and the electronic expansion valve is in a fully opened state.

By using the electronic expansion valve provided in this embodiment, the upper stop structure 50 is fixedly disposed at one end of the valve needle 40 near the valve port 11 and between the nut seat 30 and the valve port 11, and the maximum distance of the valve needle 40 relative to the valve port 11 is limited by using the upper stop structure 50, so that the upper stop structure between the rotor assembly 20 and the upper end of the nut seat 30 can be omitted, thereby simplifying the structure of the rotor assembly 20 and reducing the volume of the rotor assembly 20.

Wherein, a stop boss or a stop piece can be arranged on the valve needle 40, and the stop boss or the stop piece is in stop fit with the nut seat 30.

As shown in fig. 1 to 4, in the present embodiment, the upper stop structure 50 includes a stop block 51, the stop block 51 is disposed on the valve needle 40, the lower end surface of the nut seat 30 is provided with a first upper stop boss 31, and the stop block 51 is in limit fit with the first upper stop boss 31. In the process of rotating and axially moving the valve needle 40 relative to the nut seat 30, if the valve needle 40 moves until the stop block 51 contacts the first upper stop boss 31, the valve needle 40 can be limited to continue to rotate under the combined action of the stop block 51 and the first upper stop boss 31 at this time, so that the upper stop of the valve needle 40 is realized. Specifically, the stopper 51 is fitted over the needle 40. The stopper 51 is made of PPS.

In order to facilitate the cooperation of the stop block 51 and the first upper stop boss 31, a second upper stop boss 511 is provided on the upper end surface of the stop block 51, and the second upper stop boss 511 is in limit cooperation with the first upper stop boss 31. In the process of rotating and axially moving the valve needle 40 relative to the nut seat 30, the second upper stop boss 511 abuts against the first upper stop boss 31, so that the valve needle 40 can be limited to continue to rotate, and further upper stop of the valve needle 40 is achieved.

Specifically, the outer wall of the second upper stop boss 511 is flush with the outer wall of the stop block 51, so that in the process of rotating the stop block 51, the second upper stop boss 511 cannot touch other components, and normal operation of the device is ensured.

As shown in fig. 4, in the present embodiment, the valve pin 40 has a threaded section 41 that is threadedly engaged with the nut seat 30, and the stopper 51 is fitted over the threaded section 41 and is threadedly engaged with the threaded section 41. The stopper 51 is assembled to the needle 40 by screw-fitting, and has the advantages of simple structure and easy assembly.

Specifically, the valve needle 40 is provided with a limit boss 42, and the limit boss 42 is matched and abutted with the lower end surface of the stop block 51 to limit the position of the stop block 51 on the valve needle 40, so that the stop block 51 is prevented from falling off from the valve needle 40. When the stop block 51 needs to be assembled on the valve needle 40, the stop block 51 is sleeved on the valve needle 40, then the stop block 51 is rotated, and the stop block 51 is rotated to be in contact with the limit boss 42 by utilizing threaded fit, so that the assembly of the stop block 51 can be completed.

As shown in fig. 1 and 5 to 9, in the present embodiment, the electronic expansion valve further includes a lower stopper structure 60, and the lower stopper structure 60 is disposed between the rotor assembly 20 and the upper end of the nut seat 30 to limit the minimum distance of the valve needle 40 from the valve port 11 (when the electronic expansion valve is in the fully closed state), so as to avoid the valve needle 40 from impacting the valve port 11 during the closing process.

As shown in fig. 1, the rotor assembly 20 includes a magnetic member 21 and a stopper 22, the magnetic member 21 is drivingly connected to the stopper 22, the stopper 22 is drivingly connected to the needle 40, and the lower stopper structure 60 is disposed between the stopper 22 and the nut seat 30. During the rotation of the magnetic member 21, the magnetic member 21 drives the valve needle 40 to rotate by using the stopper 22, so as to realize the valve opening and closing operation. The provision of the lower stop structure 60 between the retainer 22 and the nut seat 30 facilitates the machining of the lower stop structure 60.

Specifically, the upper end surface of the nut seat 30 is provided with a first lower stop boss 32, the lower end surface of the stopper 22 is provided with a second lower stop boss 221, and the first lower stop boss 32 cooperates with the second lower stop boss 221 to form the lower stop structure 60. When the retainer 22 and the needle 40 move to the valve-closing position, the retainer 22 contacts the first lower stop boss 32 on the nut seat 30 with the second lower stop boss 221, thereby restricting the continued rotation and axial movement of the needle 40.

The outer wall of the first lower stop boss 32 is flush with the outer wall of the nut seat 30, so that the first lower stop boss 32 does not interfere with other components.

As shown in fig. 7 and 8, the rotor assembly 20 further includes a connecting sleeve 23, the connecting sleeve 23 is penetrated in the stopper 22 and connected with the stopper 22, and the valve needle 40 is penetrated in the connecting sleeve 23 and connected with the connecting sleeve 23. By providing the connecting sleeve 23, the connection of the retainer 22 to the valve needle 40 is facilitated.

In this embodiment, the connecting sleeve 23 is made of metal, and the connecting sleeve 23 is connected to the valve needle 40 by welding. The stopper 22 is made of PPS material, and has good strength and dimensional stability.

Wherein the retainer 22 is injection molded with the connection sleeve 23 to achieve the connection of the retainer 22 with the connection sleeve 23.

Specifically, the outer wall of the connecting sleeve 23 is provided with a limit groove 231, the limit groove 231 extends along the circumferential direction of the connecting sleeve 23, and after the retainer 22 and the connecting sleeve 23 are injection molded, the retainer 22 is clamped in the limit groove 231, so that the axial position of the connecting sleeve 23 relative to the retainer 22 can be limited, and the connecting sleeve 23 is prevented from being separated from the retainer 22.

Specifically, a rotation stopping structure 70 is disposed between the connecting sleeve 23 and the stopper 22 to limit the rotation of the connecting sleeve 23 relative to the stopper 22, so as to ensure that the connecting sleeve 23 smoothly transmits torque to the valve needle 40, and further ensure that the valve needle 40 smoothly rotates and axially moves.

In this embodiment, the rotation stopping structure 70 is a milled surface disposed in the limit groove 231, so that the cross-sectional shape of the connecting sleeve 23 at the limit groove 231 is non-circular, and after the injection molding of the stopper 22 and the connecting sleeve 23, the connecting sleeve 23 has a non-circular structure, so that the connecting sleeve 23 can be guaranteed not to rotate relative to the stopper 22.

As shown in fig. 1, in the present embodiment, the stopper 22 is injection molded with the magnetic member 21, the inner wall of the magnetic member 21 is provided with a mounting groove 211, the stopper 22 is inserted into the mounting groove 211, and the stopper 22 has a non-circular structure to limit the rotation of the stopper 22 relative to the magnetic member 21, so as to ensure that the magnetic member 21 smoothly transmits torque to the stopper 22. Specifically, the cross-sectional shape of the mounting groove 211 is a shape that is compatible with the non-circular structure of the stopper 22.

Wherein, a lightening hole is also arranged on the stopper 22 to lighten the stopper 22. Specifically, the number of the lightening holes is at least two, so that the uniformity of the weight distribution of the stopper 22 can be realized by adjusting the arrangement positions of the lightening holes, and the stability of the stopper 22 during rotation is ensured.

As shown in fig. 6, in the present embodiment, the upper end surface of the nut seat 30 is further provided with a reference boss 33, the reference boss 33 is located at one side of the first lower stop boss 32, and the reference boss 33 is lower than the first lower stop boss 32. The reference boss 33 is located on the side where the first lower stopper boss 32 is attached to the second lower stopper boss 221. The height of the lower surface of the second lower stop boss 221 of the stopper 22 is not lower than the height of the upper surface of the reference boss 33, and the reference boss 33 is used as a height reference surface of the second lower stop boss 221, so that the second lower stop boss 221 can be ensured not to be in direct contact with the upper surface of the nut seat 30 due to machining errors, and the second lower stop boss 221 can be ensured to smoothly rotate to be attached to the first lower stop boss 32.

The reference boss 33 is provided with a chamfer on a side away from the first lower stop boss 32, and the second lower stop boss 221 can be guided by the chamfer, so that the second lower stop boss 221 smoothly moves to be attached to the first lower stop boss 32.

As shown in fig. 6, in the present embodiment, the lower end surface of the nut seat 30 is provided with a first upper stop boss 31, the upper end surface of the nut seat 30 is provided with a first lower stop boss 32, both the side surface of the first upper stop boss 31 and the side surface of the first lower stop boss 32 are provided with stop surfaces 80, the valve needle 40 has a thread section 41 in threaded engagement with the nut seat 30, and the ratio of the pitch of the thread section 41 to the height dimension of the stop surfaces 80 is between 0.5 and 0.7.

The first upper stop boss 31 may be attached to the second upper stop boss 511 by the stop surface 80, and the first lower stop boss 32 may be attached to the second lower stop boss 221 by the stop surface 80 to achieve upper and lower stops. Setting the ratio of the pitch of the thread segments 41 to the height dimension of the stop surface 80 within the above-described range ensures the stop stability at the time of upper and lower stops.

If the ratio is less than 0.5, the height of the stop surface 80 is oversized, and the stop surface 80 is liable to interfere with other components, resulting in the failure of the electronic expansion valve to operate normally. If the ratio is greater than 0.7, the height of the stop surface 80 is too small, and the stop surface 80 cannot play a role in stopping, so that the problem of slipping easily occurs between the stop bosses, and the stop fails.

In the present embodiment, the electronic expansion valve is a valve body having a flow rate structure, and when the needle 40 moves to the valve closing position, the electronic expansion valve is not completely closed, and fluid can flow through the valve port 11.

By adopting the electronic expansion valve provided by the embodiment, a screw rod and a pre-tightening spring between the screw rod and the valve needle in the prior art can be omitted, so that the structure of the device can be further simplified.

When the electronic expansion valve is assembled, the assembly steps are as follows:

(1) The stop block 51 is first screwed onto the valve needle 40 and then the valve needle is screwed onto the nut seat 30;

(2) Then the components are arranged on a valve seat (a shell comprises the valve seat and a sleeve) and welded and fixed;

(3) Loading the rotor assembly 20, positioning the second lower stop boss 221 of the retainer 22 on the reference boss 33 on the nut seat 30, rotating the valve needle 40 to the lower fully closed position, and then welding and fixing the valve needle 40 and the connecting sleeve 23;

(4) Pressing in the sleeve and welding with the valve seat;

(5) Finally, the fixing frame is installed and welded and fixed.

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

(1) The lower end of the valve needle 40 is provided with a conical surface which is matched with the valve port 11 to realize flow regulation, the valve needle 40 is provided with a threaded section 41 which is matched with the nut seat 30, and the valve needle 40 is provided with a limit boss 42 for limiting the stop block 51;

(2) The stop block 51 is positioned at the lower end of the nut seat 30, and the second upper stop boss 511 of the stop block 51 and the first upper stop boss 31 at the lower end of the nut seat 30 realize upper stop;

(3) The upper end of the nut seat 30 is provided with a first lower stop boss 32 which realizes a lower stop with a second lower stop boss 221 of the stopper 22;

(4) The upper end of the nut seat 30 is further provided with a reference boss 33 to ensure that the second lower stop boss 221 is not in direct contact with the upper surface of the nut seat 30 due to a machining error.

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 in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative 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 in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electronic expansion valve, characterized in that it comprises:

a housing (10) having a valve port (11);

a rotor assembly (20) rotatably disposed within the housing (10);

the nut seat (30) is arranged in the shell (10), and the lower end of the nut seat (30) is close to the valve port (11);

the valve needle (40) is arranged in the nut seat (30) in a penetrating way and is in threaded connection with the nut seat (30), and the rotor assembly (20) is in driving connection with the valve needle (40) so as to drive the valve needle (40) to rotate relative to the nut seat (30);

an upper stop structure (50) fixedly arranged at one end of the valve needle (40) close to the valve port (11) and positioned between the nut seat (30) and the valve port (11) so as to limit the maximum distance of the valve needle (40) relative to the valve port (11);

and the lower stop structure (60) is fixedly arranged at one end of the valve needle (40) away from the valve port (11) and between the rotor assembly (20) and the upper end of the nut seat (30), so as to limit the minimum distance between the valve needle (40) and the valve port (11).

2. The electronic expansion valve according to claim 1, wherein the upper stop structure (50) comprises a stop block (51), the stop block (51) is arranged on the valve needle (40), a first upper stop boss (31) is arranged on the lower end face of the nut seat (30), and the stop block (51) is in limit fit with the first upper stop boss (31).

3. Electronic expansion valve according to claim 2, characterized in that the upper end face of the stop block (51) is provided with a second upper stop boss (511), the second upper stop boss (511) being in limit fit with the first upper stop boss (31).

4. Electronic expansion valve according to claim 2, wherein the valve needle (40) has a threaded section (41) in threaded engagement with the nut seat (30), the stop block (51) being fitted over the threaded section (41) and in threaded engagement with the threaded section (41).

5. The electronic expansion valve according to claim 2, characterized in that a limit boss (42) is provided on the valve needle (40), and the limit boss (42) is abutted against the lower end face of the stop block (51) in a matched manner so as to limit the position of the stop block (51) on the valve needle (40).

6. The electronic expansion valve according to claim 1, characterized in that the rotor assembly (20) comprises a magnetic member (21) and a stopper (22), the magnetic member (21) being in driving connection with the stopper (22), the stopper (22) being in driving connection with the valve needle (40), the lower stop structure (60) being arranged between the stopper (22) and the nut seat (30).

7. The electronic expansion valve according to claim 6, characterized in that the upper end surface of the nut seat (30) is provided with a first lower stop boss (32), the lower end surface of the stopper (22) is provided with a second lower stop boss (221), and the first lower stop boss (32) cooperates with the second lower stop boss (221) to form the lower stop structure (60).

8. The electronic expansion valve according to claim 6, wherein the rotor assembly (20) further comprises a connecting sleeve (23), the connecting sleeve (23) being threaded in the stopper (22) and connected to the stopper (22), the valve needle (40) being threaded in the connecting sleeve (23) and connected to the connecting sleeve (23).

9. The electronic expansion valve of claim 8, wherein,

the retainer (22) and the connecting sleeve (23) are injection molded;

the outer wall of the connecting sleeve (23) is provided with a limiting groove (231), the limiting groove (231) extends along the circumferential direction of the connecting sleeve (23), the stopper (22) is clamped in the limiting groove (231) to limit the axial position of the connecting sleeve (23) relative to the stopper (22), and/or a rotation stopping structure (70) is arranged between the connecting sleeve (23) and the stopper (22) to limit the connecting sleeve (23) to rotate relative to the stopper (22).

10. The electronic expansion valve according to claim 6, wherein the stopper (22) is injection molded with the magnetic member (21), a mounting groove (211) is provided on an inner wall of the magnetic member (21), the stopper (22) is inserted into the mounting groove (211), and the stopper (22) has a non-circular structure to restrict rotation of the stopper (22) relative to the magnetic member (21).

11. The electronic expansion valve according to claim 7, characterized in that the upper end surface of the nut seat (30) is further provided with a reference boss (33), the reference boss (33) is located at one side of the first lower stopper boss (32), and the reference boss (33) is lower than the first lower stopper boss (32).

12. The electronic expansion valve according to claim 1, characterized in that the lower end surface of the nut seat (30) is provided with a first upper stop boss (31), the upper end surface of the nut seat (30) is provided with a first lower stop boss (32), both the side surface of the first upper stop boss (31) and the side surface of the first lower stop boss (32) are provided with stop surfaces (80), the valve needle (40) has a thread section (41) in threaded engagement with the nut seat (30), and the ratio of the pitch of the thread section (41) to the height dimension of the stop surfaces (80) is between 0.5 and 0.7.