CN114458773A

CN114458773A - Electronic expansion valve

Info

Publication number: CN114458773A
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: 2022-05-10
Anticipated expiration: 2040-10-21
Also published as: CN114458773B

Abstract

The 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 penetrates through the nut seat 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; and 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, can solve the problem that the rotor subassembly structure among the prior art is complicated.

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 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 is arranged in the nut seat in a penetrating manner and is in threaded fit with the nut seat, the rotor assembly is in driving connection with the screw, and the screw is in driving connection with the valve needle. Under the drive of the rotor component, the screw rod can be used for driving the valve needle to move relative to the valve port on the shell, and then the operation of the switch valve 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, because the upper stopping structure and the lower stopping structure are both arranged between the rotor assembly and the nut seat, the rotor assembly has larger volume and complex structure. Therefore, the prior art has the problem that the structure of the rotor assembly is complicated.

Disclosure of Invention

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

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 penetrates through the nut seat 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; and 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 component, 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 due to the fact that the valve needle is in threaded fit with the nut seat, the valve needle can move axially while rotating, so that the relative distance between the valve needle and the valve port can be adjusted, and the operation of the switch valve is further achieved. The upper stop structure is fixedly arranged at one end, close to the valve port, of the valve needle and is positioned between the nut seat and the valve port, the maximum distance between the valve needle and the valve port is limited by the upper stop structure, the upper stop structure between the rotor assembly and the upper end of the nut seat can be omitted, the structure of the rotor assembly can be simplified, and the size of the rotor assembly is reduced.

Furthermore, 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 top stop boss, and the backstop piece is spacing with first top stop boss. In the process that the valve needle rotates relative to the nut seat and moves axially, if the valve needle moves to the point that the stop block is contacted with the first upper stop boss, the valve needle can be limited to continue rotating under the combined action of the stop block and the first upper stop boss, and then the upper stop of the valve needle is realized.

Furthermore, a second upper stop boss is arranged on the upper end face of the stop block and 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 to the first upper stop boss, so that the valve needle can be limited to rotate continuously, and the upper stop of the valve needle is further realized.

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

Furthermore, the valve needle is provided with a limiting boss, the limiting boss is matched and abutted with the lower end face of the stop block to limit the position of the stop block on the valve needle, and the stop block is prevented from falling off from 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, the stop block is rotated to be in contact with the limiting boss through thread fit, and then the assembly of the stop block can be completed.

Furthermore, the electronic expansion valve also comprises a lower stopping structure which 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 avoid the valve needle impacting the valve port in the valve closing process.

Further, the rotor assembly includes a magnetic member drivingly connected to the retainer, the retainer drivingly connected to the valve needle, and a lower stop structure disposed between the retainer and the nut seat. During the rotation of the magnetic part, the magnetic part drives the valve needle to rotate by using the stopper, so that the valve can be opened and closed. And the lower stop structure is arranged between the retainer and the nut seat, so that the lower stop structure is convenient to process.

Furthermore, the upper end face of the nut seat is provided with a first lower stopping boss, the lower end face of the retainer is provided with a second lower stopping boss, and the first lower stopping boss and the second lower stopping boss are matched to form a lower stopping structure. When the retainer and the valve needle move to the closed valve position, the retainer contacts with the first lower stop boss on the nut seat by the second lower stop boss, and further limits the valve needle to further rotate and axially move.

Further, the rotor subassembly still includes the adapter sleeve, and the adapter sleeve wears to establish in the stopper and is connected with the stopper, and the needle wears to establish in the adapter sleeve and is connected with the adapter sleeve. Through setting up the adapter sleeve, be convenient for realize the stopper and be connected with the needle.

Further, the stopper and the connecting sleeve are subjected to injection molding so as to realize the connection of the stopper 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 and prevent the connecting sleeve from falling out of the stopper, and/or a rotation stopping structure is arranged between the connecting sleeve and the stopper to limit the rotation of the connecting sleeve relative to the stopper, so that the connecting sleeve can smoothly transmit torque to the valve needle, and the valve needle can smoothly rotate and axially move.

Furthermore, the stopper and the magnetic piece are injection molded, an installation groove is formed in the inner wall of the magnetic piece, the stopper is inserted into the installation groove, and the stopper is of a non-circular structure so as to limit the rotation of the stopper relative to the magnetic piece and further ensure that the magnetic piece smoothly transmits torque to the stopper.

Furthermore, the upper end face of the nut seat is also provided with a reference boss, the reference boss is positioned on one side of the first lower stopping boss, and the reference boss is lower than the first lower stopping boss. The reference boss is used as a height reference surface of the second lower stopping boss, so that the second lower stopping boss cannot be in direct contact with the upper surface of the nut seat due to machining errors, and the second lower stopping boss is guaranteed to smoothly rotate to be attached to the first lower stopping boss.

Furthermore, a first upper stop boss is arranged on the lower end face of the nut seat, a first lower stop boss is arranged on the upper end face of the nut seat, stop faces are arranged on the side face of the first upper stop boss and the side face of the first lower stop boss, the valve needle is provided with a thread section in threaded fit with the nut seat, and the ratio of the thread pitch of the thread section to the height dimension of the stop faces is 0.5-0.7. The first upper stop boss can be attached to the second upper stop boss through the stop surface, and the first lower stop boss can be attached to the second lower stop boss through the stop surface, so that the upper stop and the lower stop are realized. The ratio of the thread pitch of the thread section to the height dimension of the stop surface is set within the above range, so that the stop stability during the upper stop and the lower stop can be ensured.

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 is a cross-sectional view illustrating an electronic expansion valve provided in accordance with an embodiment of the present invention in a fully closed state;

fig. 2 is a cross-sectional view of an electronic expansion valve provided in accordance with an embodiment of the present invention in a fully open state;

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

figure 4 shows a schematic structural view of the valve needle of figure 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 socket of FIG. 1;

figure 7 shows an assembly of the stopper and coupling sleeve of figure 1;

figure 8 shows a cross-sectional view of the stopper and coupling sleeve of figure 1;

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

Wherein the figures include the following reference numerals:

10. a housing; 11. a valve port; 20. a rotor assembly; 21. a magnetic member; 211. mounting grooves; 22. a stopper; 221. a second lower stop boss; 23. connecting sleeves; 231. a limiting 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 segment; 42. a limiting 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 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 and 2, an embodiment of the present invention provides an electronic expansion valve including 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 in 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 inserted into 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 due to the threaded fit between the valve needle 40 and the nut seat 30, the valve needle 40 moves axially while rotating, so that the valve port 11 can be opened or closed by the valve needle 40. In the present embodiment, the upper stop structure 50 is fixedly disposed at an end of the valve needle 40 close to the valve port 11 and located between the nut seat 30 and the valve port 11 to limit a maximum distance of the valve needle 40 relative to the valve port 11, where the electronic expansion valve is in a fully open state.

With the electronic expansion valve provided in this embodiment, the upper stop structure 50 is fixedly disposed at one end of the valve needle 40 close to the valve port 11 and located between the nut seat 30 and the valve port 11, and the upper stop structure 50 is used to limit the maximum distance of the valve needle 40 relative to the valve port 11, so that the upper stop structure between the rotor assembly 20 and the upper end of the nut seat 30 can be eliminated, thereby simplifying the structure of the rotor assembly 20 and reducing the volume of the rotor assembly 20.

Here, a stop boss or a stop member may be provided on the needle 40, and the stop boss or the stop member may be engaged 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 that the valve needle 40 rotates and axially moves relative to the nut seat 30, if the valve needle 40 moves until the stop block 51 contacts with the first upper stop boss 31, the valve needle 40 is restricted from continuing to rotate under the combined action of the stop block 51 and the first upper stop boss 31, and then the upper stop of the valve needle 40 is realized. Specifically, the stop block 51 is fitted over the valve needle 40. The stop block 51 is made of PPS material.

In order to facilitate the matching of the stop block 51 and the first upper stop boss 31, a second upper stop boss 511 is arranged on the upper end surface of the stop block 51, and the second upper stop boss 511 is in limit matching with the first upper stop boss 31. In the process that the valve needle 40 rotates and axially moves relative to the nut seat 30, the second upper stop boss 511 is abutted against the first upper stop boss 31, so that the valve needle 40 is limited from continuing to rotate, and the upper stop of the valve needle 40 is further realized.

Specifically, the outer wall of the second upper stop boss 511 is flush with the outer wall of the stop block 51, so that the second upper stop boss 511 does not touch other components during the rotation of the stop block 51, and the normal operation of the device is ensured.

As shown in fig. 4, in the present embodiment, the valve needle 40 has a threaded section 41 threadedly engaged with the nut seat 30, and the stop block 51 is sleeved on the threaded section 41 and threadedly engaged with the threaded section 41. The stop block 51 is assembled on the valve needle 40 by adopting thread fit, and has the advantages of simple structure and convenient assembly.

Specifically, the valve needle 40 is provided with a limit boss 42, and the limit boss 42 is in fit abutment with the lower end surface of the stopper block 51 to limit the position of the stopper block 51 on the valve needle 40 and prevent the stopper block 51 from falling off the valve needle 40. When the stop block 51 needs to be assembled on the valve needle 40, the stop block 51 is firstly sleeved on the valve needle 40, then the stop block 51 is rotated, the stop block 51 is rotated to be in contact with the limit boss 42 by means of thread fit, and then the assembly of the stop block 51 can be completed.

As shown in fig. 1 and 5-9, in the present embodiment, the electronic expansion valve further includes a lower stop structure 60, and the lower stop 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 relative to the valve port 11 (when the electronic expansion valve is in the fully closed state), so as to prevent the valve needle 40 from impacting the valve port 11 during the valve 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 with the stopper 22, the stopper 22 is drivingly connected with the valve needle 40, and a 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 uses the stopper 22 to rotate the needle 40, thereby performing the valve opening and closing operation. The lower stop structure 60 is disposed between the retainer 22 and the nut holder 30 to facilitate machining of the lower stop structure 60.

Specifically, the upper end surface of the nut holder 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 and the second lower stop boss 221 cooperate to form the lower stop structure 60. When the retainer 22 and the valve needle 40 move to the closed valve position, the retainer 22 contacts the first lower stop boss 32 on the nut seat 30 by the second lower stop boss 221, thereby limiting the further rotation and axial movement of the valve needle 40.

Wherein the outer wall of the first lower stopping projection 32 is flush with the outer wall of the nut holder 30, so that the first lower stopping projection 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 inserted into the stopper 22 and connected with the stopper 22, and the valve needle 40 is inserted into the connecting sleeve 23 and connected with the connecting sleeve 23. The connection of the retainer 22 to the valve needle 40 is facilitated by the provision of the connecting sleeve 23.

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

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

Specifically, 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, and after the retainer 22 and the connecting sleeve 23 are injection molded, the retainer 22 is clamped in the limiting 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 pulled out of 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 the torque to the valve needle 40, and further ensure that the valve needle 40 smoothly rotates and axially moves.

In the present embodiment, the rotation stopping structure 70 is a milled surface disposed in the limiting groove 231, so that the cross-sectional shape of the connecting sleeve 23 at the limiting groove 231 is non-circular, and after the injection molding of the retainer 22 and the connecting sleeve 23, since the connecting sleeve 23 has a non-circular structure, it can be ensured that the connecting sleeve 23 does not rotate relative to the retainer 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 can smoothly transmit the torque to the stopper 22. Specifically, the cross-sectional shape of the mounting groove 211 is a shape that fits the non-circular configuration of the stopper 22.

A weight reduction hole is also provided in the retainer 22 to reduce the weight of the retainer 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 holder 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 and the second lower stopper boss 221 are attached. The height of the lower surface of the second lower stopping boss 221 of the retainer 22 is not lower than the height of the upper surface of the reference boss 33, and the reference boss 33 is used as the height reference surface of the second lower stopping boss 221, so that the second lower stopping boss 221 cannot be directly contacted with the upper surface of the nut seat 30 due to machining errors, and the second lower stopping boss 221 is ensured to smoothly rotate until being attached to the first lower stopping boss 32.

A chamfer is provided on the side of the reference boss 33 away from the first lower stopping boss 32, and the second lower stopping boss 221 can be guided by the chamfer, so that the second lower stopping boss 221 can move smoothly to be attached to the first lower stopping 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, a side surface of the first upper stop boss 31 and a side surface of the first lower stop boss 32 are both provided with stop surfaces 80, the needle 40 has a threaded section 41 in threaded engagement with the nut seat 30, and a ratio of a thread pitch of the threaded section 41 to a height dimension of the stop surfaces 80 is between 0.5 and 0.7.

The first upper stop boss 31 can be attached to the second upper stop boss 511 via the stop surface 80, and the first lower stop boss 32 can be attached to the second lower stop boss 221 via the stop surface 80, so as to achieve upper and lower stops. Setting the ratio of the pitch of the threaded section 41 to the height dimension of the stop surface 80 within the above range ensures stop stability at the time of the upper stop and the lower stop.

If the ratio is less than 0.5, the height of the stop surface 80 is too large, 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, the stop surface 80 cannot play a due stop role, and the problem of slippage between the stop bosses is easily caused, so that the stop fails.

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

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

When the electronic expansion valve is assembled, the assembling 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 (the shell comprises the valve seat and a sleeve) and are welded and fixed;

(3) the rotor assembly 20 is installed, the second lower stopping boss 221 of the stopper 22 is positioned on the reference boss 33 on the nut seat 30, the valve needle 40 is rotated to the lower fully closed position, and then the valve needle 40 and the connecting sleeve 23 are welded and fixed;

(4) pressing the sleeve into the valve seat and welding the sleeve with the valve seat;

(5) and finally, mounting the glass fiber reinforced plastic composite material into a fixing frame and welding and fixing the glass fiber reinforced plastic composite material.

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 which is used 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 stopping boss 32 which realizes lower stopping with a second lower stopping boss 221 of the stopper 22;

(4) the upper end of the nut seat 30 is further provided with a reference boss 33, which ensures that the second lower stop boss 221 does not directly contact with the upper surface of the nut seat 30 due to machining errors.

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. An electronic expansion valve, comprising:

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) penetrates through the nut seat (30) 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);

the upper stop structure (50) is fixedly arranged at one end, close to the valve port (11), of the valve needle (40) and is 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).

2. An 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), 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).

3. An electronic expansion valve according to claim 2, wherein the upper end surface of the stop block (51) is provided with a second upper stop projection (511), and the second upper stop projection (511) is in limit fit with the first upper stop projection (31).

4. The 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), and the stop block (51) is fitted over the threaded section (41) and in threaded engagement with the threaded section (41).

5. An electronic expansion valve according to claim 2, wherein the valve needle (40) is provided with a limit projection (42), the limit projection (42) is in cooperating abutment with a lower end surface of the stop block (51) for limiting the position of the stop block (51) on the valve needle (40).

6. An electronic expansion valve according to claim 1, further comprising a lower stop structure (60), the lower stop structure (60) being arranged between the rotor assembly (20) and an upper end of the nut seat (30) to limit a minimum distance of the valve needle (40) relative to the valve port (11).

7. An electronic expansion valve according to claim 6, wherein 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).

8. An electronic expansion valve according to claim 7, wherein an upper end surface of the nut seat (30) is provided with a first lower stop boss (32), a lower end surface of the stopper (22) is provided with a second lower stop boss (221), and the first lower stop boss (32) and the second lower stop boss (221) cooperate to form the lower stop structure (60).

9. The electronic expansion valve according to claim 7, wherein the rotor assembly (20) further comprises a connecting sleeve (23), the connecting sleeve (23) is inserted into the stopper (22) and connected with the stopper (22), and the valve needle (40) is inserted into the connecting sleeve (23) and connected with the connecting sleeve (23).

10. The electronic expansion valve of claim 9,

the retainer (22) and the connecting sleeve (23) are formed in an injection molding mode;

be provided with spacing groove (231) on the outer wall of adapter sleeve (23), spacing groove (231) are followed the circumference of adapter sleeve (23) extends, stopper (22) card is established in spacing groove (231), in order to restrict adapter sleeve (23) is relative the axial position of stopper (22), and/or, adapter sleeve (23) with be provided with between stopper (22) and only rotate structure (70), in order to restrict adapter sleeve (23) is relative stopper (22) rotate.

11. The electronic expansion valve according to claim 7, wherein the stopper (22) is injection molded with the magnetic member (21), an 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 restrict the rotation of the stopper (22) with respect to the magnetic member (21).

12. An electronic expansion valve according to claim 8, wherein the upper end surface of the nut seat (30) is further provided with a reference boss (33), the reference boss (33) being located at a side of the first lower stop boss (32), and the reference boss (33) being lower than the first lower stop boss (32).

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