CN221097471U - Electronic expansion valve - Google Patents

Abstract

The utility model provides an electronic expansion valve, comprising: a housing; the valve seat is provided with a valve port, the shell is covered at one end of the valve seat far away from the valve port, and the end face of the connecting end is abutted with the end face of the valve seat; the valve needle assembly is movably arranged in the shell and corresponds to the valve port; the valve needle assembly is arranged on the valve seat in a penetrating way, the nut sleeve can provide a guiding function for the valve needle assembly, and the valve needle assembly is matched with the nut sleeve to adjust the flow at the valve port; the gland is sleeved on the nut sleeve, the gland is used for limiting the position of the nut sleeve in the axial direction, the end part of the gland, which faces the valve seat, is abutted against the end face of the valve seat, the shell is positioned on the outer side of the gland, the inner wall of the connecting end is attached to the outer side wall of the gland, and the gland, the connecting end and the valve seat are welded with each other. By the technical scheme provided by the utility model, the problem of low installation efficiency of the electronic expansion valve in the prior art can be solved.

Description

Electronic expansion valve

Technical Field

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

Background

The electronic expansion valve in the prior art mainly comprises a shell, a valve needle assembly, a nut sleeve and a valve seat, wherein the nut sleeve is fixedly arranged in the valve seat, the valve seat is provided with a valve port, and the valve needle assembly can be matched with the nut sleeve to be close to or far away from the valve port so as to adjust the flow of fluid at the valve port. In the prior art, a limiting piece is fixedly installed on a nut sleeve, the limiting piece and a valve seat are welded together to fix the nut sleeve in the valve seat, and finally a shell is welded on the valve seat to complete the integral assembly of the electronic expansion valve. The installation process is complex and the installation efficiency is low.

Disclosure of utility model

The utility model provides an electronic expansion valve, which aims to solve the problem of low installation efficiency of the electronic expansion valve in the prior art.

The utility model provides an electronic expansion valve, which comprises: a housing having oppositely disposed closed and connecting ends; the valve seat is provided with a valve port, the shell is covered at one end of the valve seat far away from the valve port, and the end face of the connecting end is abutted with the end face of the valve seat; the valve needle assembly is movably arranged in the shell and corresponds to the valve port; the valve needle assembly is arranged on the valve seat in a penetrating way, the nut sleeve can provide a guiding function for the valve needle assembly, and the valve needle assembly is matched with the nut sleeve to adjust the flow at the valve port; the gland is sleeved on the nut sleeve, the gland is used for limiting the position of the nut sleeve in the axial direction, the end part of the gland, which faces the valve seat, is abutted against the end face of the valve seat, the shell is positioned on the outer side of the gland, the inner wall of the connecting end is attached to the outer side wall of the gland, and the gland, the connecting end and the valve seat are welded with each other.

By adopting the technical scheme, the nut sleeve can be fixed in the valve seat by arranging the gland, so that the valve needle assembly is prevented from driving the nut sleeve to move in the moving process, and the nut sleeve is ensured not to displace in the axial direction. In the utility model, the end part of the gland facing the valve seat and the connecting end of the shell are abutted against the valve seat, and meanwhile, the inner wall of the connecting end is attached to the outer side wall of the gland, so that the gland and the valve seat can be welded together by only one-time welding at the connecting part of the shell and the valve seat during welding, thereby realizing the welding of the gland, the shell and the valve seat, and further realizing the fixation of the nut sleeve. According to the technical scheme, in the assembly process of the electronic expansion valve, the nut sleeve, the shell and the valve seat can be mounted and fixed only by one welding process, so that the process flow is simplified, and the assembly efficiency is improved.

Further, the valve seat is further provided with an installation cavity, the valve port is communicated with the installation cavity, one end, facing the shell, of the valve seat is provided with a first step section and a second step section which are arranged in a stepped mode, the second step section is close to the valve port, the outer diameter of the second step section is larger than that of the first step section, the end face, close to one end of the shell, of the second step section forms a first step surface, and the end portions, facing the valve seat, of the connecting end and the gland are in butt joint with the first step surface. Through above-mentioned setting, gland and casing can fix on the second bench jointly after the welding, prevent that the casing from producing to rock and then influence the stability of gland and nut cover.

Further, the outer side wall of the first step section is provided with an avoidance groove, the avoidance groove is positioned at the joint of the first step section and the second step section, and the inner side wall of the gland close to one end of the valve seat is attached to the outer side wall of the first step section. Through the arrangement, the end face, close to one end of the valve seat, of the gland can be enabled to be in contact with the first step surface, the risk that the gland and the first step surface are not welded in place in the welding process is reduced, and the welding effect is guaranteed.

Further, the outer side wall of the nut sleeve is provided with a first limit step and a second limit step at intervals along the axis, the second limit step is arranged close to the valve port, the valve seat is further provided with a valve cavity communicated with the installation cavity, the valve port is communicated with the valve cavity, the joint of the installation cavity and the valve cavity is provided with a second step surface, the gland is in limit fit with the first limit step, and the second limit step is in limit fit with the second step surface so as to fix the nut sleeve on the valve seat. Through above-mentioned setting, gland and second step face can carry out spacingly in the axial to the nut cover jointly to prevent that the nut cover from being driven by the needle subassembly and producing the displacement at the in-process of needle subassembly motion, so can guarantee the relative position of nut cover in the disk seat, promote the stability of electron expansion valve in the operation in-process.

Further, the first limiting step protrudes from the end face, far away from the valve port, of the valve seat. Through the arrangement, the gland and the nut sleeve can be conveniently abutted, the problem of machining precision is prevented, a gap exists between the gland and the first limiting step of the nut sleeve, and the gland and the first limiting step are matched in place.

Further, a limiting structure is arranged between the nut sleeve and the gland, and the limiting structure can limit rotation between the nut sleeve and the gland. Through the arrangement, the nut sleeve can be prevented from rotating relative to the gland in the process of moving along with the valve needle assembly, so that the flow accuracy of the valve needle assembly at the valve port adjusting position is affected.

Further, the gland has the through-hole, and the nut cover wears to establish in the through-hole, and limit structure includes spacing arch and spacing groove, and spacing arch sets up on the lateral wall of nut cover or on the inner wall of through-hole, and the spacing groove sets up in the through-hole or on the lateral wall of nut cover, and spacing groove and spacing protruding cooperation realize the circumference spacing of gland and nut cover. Through the arrangement, the limiting protrusion can be clamped in the limiting groove, further, the nut sleeve is prevented from rotating relative to the gland in the process of moving along with the valve needle assembly, the nut sleeve is ensured to stably provide a guiding effect for the valve needle assembly in the working process of the electronic expansion valve, and the service performance of the electronic expansion valve is improved.

Further, the limiting protrusions and the limiting grooves are all arranged in a plurality, the limiting protrusions are arranged on the outer side wall of the nut sleeve or the inner wall of the through hole at intervals in the circumferential direction, the limiting grooves are arranged on the inner wall of the through hole or the outer side wall of the nut sleeve at intervals in the circumferential direction, and the limiting protrusions and the limiting grooves are arranged in a one-to-one correspondence mode. Through the setting, a plurality of spacing protruding and spacing groove cooperate together can promote limit structure's circumference spacing effect, guarantee limit structure's spacing function, set up a plurality of spacing protruding along circumference interval on the lateral wall of nut cover, can strengthen spacing protruding and nut cover's linking property, and then reduce spacing protruding risk from the roll-off in the spacing groove, promote spacing protruding and the spacing effect of spacing groove.

Further, a tangential plane is arranged on the side wall of the nut sleeve, a circulation channel is formed between the tangential plane and the side wall of the installation cavity, and the valve cavity is communicated with the inside of the shell through the circulation channel. Through the arrangement, when fluid flows through the valve cavity, the fluid can enter the shell through the circulation channel, so that the pressure balance between the valve cavity and the interior of the shell is ensured, the pressure difference which needs to be overcome when the valve needle assembly is opened or the valve port is plugged is reduced, and the rapid flow adjustment of the electronic expansion valve is conveniently realized.

Further, the gland is provided with a circulation port, the circulation port is correspondingly arranged with a circulation channel, and the circulation channel is communicated with the inside of the shell through the circulation port. Through the arrangement, fluid can enter the inside of the shell through the circulation port, and the pressure difference which needs to be overcome when the valve needle assembly opens or blocks the valve port is reduced.

Drawings

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

Fig. 1 shows a schematic structural diagram of an electronic expansion valve provided by the utility model;

FIG. 2 shows a partial enlarged view at A in FIG. 1;

FIG. 3 shows a schematic structural view of a valve seat provided by the present utility model;

FIG. 4 shows a schematic structural view of the nut sleeve provided by the utility model;

FIG. 5 shows a top view of the nut collar provided by the present utility model;

fig. 6 shows a schematic structural diagram of the gland provided by the utility model.

Wherein the above figures include the following reference numerals:

10. A housing;

20. A valve seat; 21. a first step; 211. an avoidance groove; 22. a second step; 221. a first step surface; 222. a second step surface;

201. A valve port; 202. a mounting cavity; 203. a valve cavity;

30. a valve needle assembly;

40. a nut sleeve; 41. a first limit step; 42. a second limit step; 43. a limit protrusion;

50. a gland; 51. a through hole; 52. a limit groove; 53. a flow port;

100. a flow channel; 200. cutting into sections.

Detailed Description

The following description of the embodiments of the present utility model 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 utility model, 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 utility model, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1, an embodiment of the present utility model provides an electronic expansion valve comprising a housing 10, a valve seat 20, a valve needle assembly 30, a nut sleeve 40, and a gland 50. Wherein the housing 10 has oppositely disposed closed and connecting ends. The valve seat 20 has a valve port 201, and the housing 10 is covered on one end of the valve seat 20 away from the valve port 201, and an end face of the connection end abuts against an end face of the valve seat 20. The valve needle assembly 30 is movably disposed within the housing 10, with the valve needle assembly 30 being disposed in correspondence with the valve port 201. The nut sleeve 40 is disposed on the valve seat 20, the valve needle assembly 30 is disposed through the nut sleeve 40, the nut sleeve 40 is capable of providing a guiding function for the valve needle assembly 30, and the valve needle assembly 30 cooperates with the nut sleeve 40 to regulate the flow at the valve port 201. The gland 50 is sleeved on the nut sleeve 40, the gland 50 is used for limiting the position of the nut sleeve 40 in the axial direction, the end part of the gland 50 facing the valve seat 20 is abutted against the end face of the valve seat 20, the shell 10 is positioned on the outer side of the gland 50, the inner wall of the connecting end is attached to the outer side wall of the gland 50, and the gland 50, the connecting end and the valve seat 20 are welded with each other.

By applying the technical scheme of the utility model, the electronic expansion valve comprises a shell 10, a valve seat 20, a valve needle assembly 30, a nut sleeve 40 and a gland 50, wherein the nut sleeve 40 can be fixed in the valve seat 20 by arranging the gland 50, so that the valve needle assembly 30 is prevented from driving the nut sleeve 40 to move in the moving process, and the nut sleeve 40 is ensured not to displace in the axial direction. In the utility model, the end of the gland 50 facing the valve seat 20 and the connecting end of the shell 10 are abutted against the valve seat 20, and meanwhile, the inner wall of the connecting end is attached to the outer side wall of the gland, so that only one-time welding is needed at the joint of the shell 10 and the valve seat 20 during welding, the gland 50 and the valve seat 20 can be welded together by the heat of welding, so that the welding of the gland 50, the shell 10 and the valve seat 20 can be realized, and the fixation of the nut sleeve 40 can be realized. According to the technical scheme, in the assembly process of the electronic expansion valve, the nut sleeve 40, the shell 10 and the valve seat 20 can be mounted and fixed only by one welding process, so that the process flow is simplified, and the assembly efficiency is improved.

Specifically, in the present application, the outer wall of the gland 50 on the side far from the nut sleeve 40 is an outer side wall, and the outer wall of the gland 50 on the side near the nut sleeve 40 is an inner side wall.

In a specific embodiment of the present application, the gland 50, the connecting end of the housing 10 and the valve seat 20 are connected by laser welding, so that the energy density of the laser welding is high, and the gland 50 and the valve seat 20 are welded together while the connecting end of the housing 10 and the valve seat 20 are welded together, thereby ensuring the welding effect.

In a specific embodiment of the present application, the valve needle assembly 30 is provided with an external thread section, the nut sleeve 40 is provided with an internal thread section, the valve needle assembly 30 can rotate in the nut sleeve 40 under the driving of the electromagnetic coil, and the cooperation of the valve needle assembly 30 and the nut sleeve 40 can convert the rotation of the valve needle assembly 30 in the circumferential direction into the movement along the axial direction of the nut sleeve 40, so as to adjust the distance between the valve needle assembly 30 and the valve port 201 in the axial direction, and further realize the function of adjusting the flow rate at the valve port 201.

In yet another embodiment of the present application, the valve needle assembly 30 is provided with an internal thread segment, the nut sleeve 40 is provided with an external thread segment, and the cooperation of the valve needle assembly 30 and the nut sleeve 40 converts the rotation of the valve needle assembly 30 in the circumferential direction into the movement along the axial direction of the nut sleeve 40, so as to adjust the distance between the valve needle assembly 30 and the valve port 201 in the axial direction, thereby realizing the function of adjusting the flow rate at the valve port 201.

As shown in fig. 2 and 3, one end of the valve seat 20 facing the housing 10 has a first step 21 and a second step 22 which are arranged in a stepped manner, the second step 22 is arranged near the valve port 201, the outer diameter of the second step 22 is larger than that of the first step 21, the end face of the second step 22 near the end of the housing 10 forms a first step surface 221, and both the connecting end and the end of the gland 50 facing the valve seat 20 are abutted against the first step surface 221. Through the arrangement, the gland 50 and the shell 10 can be jointly fixed on the second step section 22 after being welded, the first step section 21 can provide radial limiting functions for the gland 50 and the shell 10, the shell 10 is prevented from shaking, stability of the gland 50 and the nut sleeve 40 is further affected, and service performance of the electronic expansion valve is further improved.

Specifically, the outer side wall of the first step 21 is provided with an avoidance groove 211, the avoidance groove 211 is located at the connection position of the first step 21 and the second step 22, and the inner side wall of the gland 50 near one end of the valve seat 20 is attached to the outer side wall of the first step 21. When the first step 21 and the second step 22 are machined, the arc-shaped tip of the cutting tool can lead to the formation of an arc-shaped surface at the joint of the first step 21 and the second step 22, so that the gland 50 cannot be contacted with the first step surface 221, and through the arrangement, the end face, close to one end of the valve seat 20, of the gland 50 can be contacted with the first step surface 221, the risk that the gland 50 cannot be welded with the first step surface 221 in the welding process is reduced, and the welding effect is ensured.

Further, as shown in fig. 3 to 5, the valve seat 20 further has a mounting cavity 202, the valve port 201 is communicated with the mounting cavity 202, a first limiting step 41 and a second limiting step 42 are arranged on the outer side wall of the nut sleeve 40 along the axis at intervals, the second limiting step 42 is arranged close to the valve port 201, the valve seat 20 has a mounting cavity 202 and a valve cavity 203 which are mutually communicated, the valve port 201 is communicated with the valve cavity 203, a second step surface 222 is arranged at the joint of the mounting cavity 202 and the valve cavity 203, the gland 50 is in limiting fit with the first limiting step 41, and the second limiting step 42 is in limiting fit with the second step surface 222 so as to fix the nut sleeve 40 on the valve seat 20. Through the arrangement, the first limiting step 41 and the gland 50 are matched to limit the nut sleeve 40, the second limiting step 42 and the second stepped surface 222 are matched to limit the nut sleeve 40 downwards, the gland 50 and the second stepped surface 222 can limit the nut sleeve 40 in the axial direction together, so that the nut sleeve 40 is prevented from being driven to generate displacement by the valve needle assembly 30 in the movement process of the valve needle assembly 30, the relative position of the nut sleeve 40 in the valve seat 20 can be guaranteed, and the stability of the electronic expansion valve in the operation process is improved.

In one embodiment of the present application, the end surface of the first limiting step 41 protrudes from the end surface of the valve seat 20 away from the valve port 201. Through the arrangement, the gland 50 can be conveniently abutted with the nut sleeve 40, the problem of machining precision is prevented, and when the gland 50 is abutted with the first step surface 221 after the gland 50 is installed, a gap exists between the gland 50 and the first limiting step 41, so that the gland 50 can be prevented from being incapable of axially limiting the nut sleeve 40. By the technical scheme, the gland 50 and the first limiting step 41 can be matched in place, and the stability of the nut sleeve 40 on the valve seat 20 is improved.

In another embodiment of the present application, a pressing block extending towards the first limiting step 41 is disposed on a surface of the pressing cover 50 facing the first limiting step 41, so that the pressing cover 50 and the first limiting step 41 can be matched in place, so that the pressing cover 50 can press the first limiting step 41, and the working stability of the electronic expansion valve is improved.

Further, a limiting structure is arranged between the nut sleeve 40 and the gland 50, and the limiting structure can limit the rotation between the nut sleeve 40 and the gland 50. Through set up limit structure between nut cover 40 and gland 50, can prevent that nut cover 40 from taking place the rotation of relative gland 50 at the in-process of needle subassembly 30 motion, and influence the accuracy of the flow of needle subassembly 30 regulation valve port 201 department.

In a specific embodiment of the present application, as shown in fig. 5 and 6, the gland 50 has a through hole 51, the nut sleeve 40 is inserted into the through hole 51, the limiting structure includes a limiting protrusion 43 and a limiting groove 52, the limiting protrusion 43 is disposed on an outer side wall of the nut sleeve 40 or an inner wall of the through hole 51, the limiting groove 52 is disposed in the through hole 51 or an outer side wall of the nut sleeve 40, and the limiting groove 52 cooperates with the limiting protrusion 43 to realize circumferential limitation of the gland 50 and the nut sleeve 40. Through the arrangement, the limiting projection 43 can be clamped in the limiting groove 52, so that the nut sleeve 40 is prevented from rotating relative to the gland 50 in the movement process of the valve needle assembly 30, the nut sleeve 40 is ensured to stably provide a guiding effect for the valve needle assembly 30 in the working process of the electronic expansion valve, and the service performance of the electronic expansion valve is improved.

In a specific embodiment of the present application, the limiting protrusion 43 is disposed on the inner wall of the through hole 51, and the limiting groove 52 is disposed on the outer sidewall of the nut sleeve 40, so that the rotation between the nut sleeve 40 and the gland 50 can be limited by the above arrangement, and the limiting function of the limiting structure is ensured.

In still another embodiment of the present application, the limiting protrusion 43 is disposed on the outer sidewall of the nut sleeve 40, and the limiting groove 52 is disposed in the through hole 51, so that the connection performance between the limiting protrusion 43 and the nut sleeve 40 can be enhanced, and further, the risk that the limiting protrusion 43 falls off from the nut sleeve 40 when the limiting protrusion 43 is subjected to the shearing force of the limiting groove 52 is reduced, and the limiting effect of the limiting protrusion 43 and the limiting groove 52 is ensured.

Further, the plurality of limiting protrusions 43 and the plurality of limiting grooves 52 are arranged, the plurality of limiting protrusions 43 are circumferentially arranged on the outer side wall of the nut sleeve 40 or the inner wall of the through hole 51 at intervals, the plurality of limiting grooves 52 are circumferentially arranged on the inner wall of the through hole 51 or the outer side wall of the nut sleeve 40 at intervals, and the limiting protrusions 43 and the limiting grooves 52 are arranged in a one-to-one correspondence. Through the above arrangement, the plurality of limiting protrusions 43 and the limiting grooves 52 cooperate together to promote the circumferential limiting effect of the limiting structure, and the limiting function of the limiting structure is guaranteed.

In one embodiment of the present application, a tangential surface 200 is provided on the sidewall of the nut housing 40, a flow channel 100 is formed between the tangential surface 200 and the sidewall of the mounting cavity 202, and the valve cavity 203 communicates with the interior of the housing 10 through the flow channel 100. Through the arrangement, when fluid flows through the valve cavity 203, the fluid can enter the shell 10 through the circulation channel 100, so that the pressure balance between the valve cavity 203 and the interior of the shell 10 is ensured, the pressure difference which needs to be overcome when the valve needle assembly 30 is opened or the valve port 201 is plugged is reduced, the rapid flow adjustment of the electronic expansion valve is conveniently realized, meanwhile, the pressure fluctuation generated when small fluid flows through the valve cavity 203 can be reduced, the bubbles in the fluid are led into the interior of the shell 10 through the circulation channel 100, the bubbles are prevented from generating noise when being throttled and cracked at the position passing through the valve port 201, and the comfort level experience of a user is improved.

Specifically, the gland 50 is provided with a flow port 53, the flow port 53 is provided corresponding to the flow passage 100, and the flow passage 100 communicates with the inside of the housing 10 through the flow port 53. Through the arrangement, the communication between the circulation channel 100 and the interior of the housing 10 can be ensured, the gland 50 is prevented from blocking the circulation channel 100, so that fluid can enter the interior of the housing 10 through the circulation port 53, and the pressure difference to be overcome when the valve needle assembly 30 opens or blocks the valve port 201 is reduced.

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 exemplary embodiments according to 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 utility model 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 utility model, 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 utility model 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 utility model; 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 on … …," "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 "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 utility model.

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

Claims (10)

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

a housing (10), said housing (10) having oppositely disposed closed and connected ends;

A valve seat (20) having a valve port (201), wherein the housing (10) is covered at one end of the valve seat (20) away from the valve port (201), and the end surface of the connecting end is abutted against the end surface of the valve seat (20);

A valve needle assembly (30) movably arranged in the housing (10), the valve needle assembly (30) being arranged in correspondence to the valve port (201);

The nut sleeve (40) is arranged on the valve seat (20), the valve needle assembly (30) penetrates through the nut sleeve (40), the nut sleeve (40) can provide a guiding function for the valve needle assembly (30), and the valve needle assembly (30) is matched with the nut sleeve (40) to adjust the flow rate at the valve port (201);

Gland (50) are sleeved on the nut sleeve (40), the gland (50) is used for limiting the position of the nut sleeve (40) in the axial direction, the end part of the gland (50) facing the valve seat (20) is abutted to the end face of the valve seat (20), the shell (10) is located on the outer side of the gland (50), the inner wall of the connecting end is attached to the outer side wall of the gland (50), and the gland (50) and the connecting end are welded with the valve seat (20).

2. The electronic expansion valve according to claim 1, characterized in that one end of the valve seat (20) facing the housing (10) is provided with a first step section (21) and a second step section (22) which are arranged in a stepped manner, the second step section (22) is arranged close to the valve port (201), the outer diameter of the second step section (22) is larger than that of the first step section (21), the end face of the second step section (22) close to one end of the housing (10) forms a first step surface (221), and the end parts of the connecting end and the gland (50) facing the valve seat (20) are in butt joint with the first step surface (221).

3. The electronic expansion valve according to claim 2, wherein an avoidance groove (211) is formed in the outer side wall of the first step section (21), the avoidance groove (211) is located at a joint of the first step section (21) and the second step section (22), and the inner side wall, close to one end of the valve seat (20), of the gland (50) is attached to the outer side wall of the first step section (21).

4. The electronic expansion valve according to claim 1, wherein the valve seat (20) further comprises a mounting cavity (202), the valve port (201) is communicated with the mounting cavity (202), a first limit step (41) and a second limit step (42) are arranged on the outer side wall of the nut sleeve (40) along the axis at intervals, the second limit step (42) is arranged close to the valve port (201), the valve seat (20) further comprises a valve cavity (203) communicated with the mounting cavity (202), the valve port (201) is communicated with the valve cavity (203), a second step surface (222) is arranged at the joint of the mounting cavity (202) and the valve cavity (203), the gland (50) is in limit fit with the first limit step (41), and the second limit step (42) is in limit fit with the second step surface (222) so as to fix the nut sleeve (40) on the valve seat (20).

5. The electronic expansion valve according to claim 4, characterized in that the first limiting step (41) is arranged protruding from an end face of the valve seat (20) remote from the valve port (201).

6. The electronic expansion valve of claim 1, wherein a limiting structure is provided between the nut sleeve (40) and the gland (50), the limiting structure being capable of limiting rotation between the nut sleeve (40) and the gland (50).

7. The electronic expansion valve according to claim 6, wherein the gland (50) is provided with a through hole (51), the nut sleeve (40) is arranged in the through hole (51) in a penetrating manner, the limiting structure comprises a limiting protrusion (43) and a limiting groove (52), the limiting protrusion (43) is arranged on the outer side wall of the nut sleeve (40) or the inner wall of the through hole (51), the limiting groove (52) is correspondingly arranged in the through hole (51) or the outer side wall of the nut sleeve (40), and the limiting groove (52) is matched with the limiting protrusion (43) to achieve circumferential limiting of the gland (50) and the nut sleeve (40).

8. The electronic expansion valve according to claim 7, wherein the limit protrusions (43) and the limit grooves (52) are provided in plurality, the limit protrusions (43) are circumferentially arranged on the outer side wall of the nut sleeve (40) or the inner wall of the through hole (51) at intervals, the limit grooves (52) are circumferentially arranged on the inner wall of the through hole (51) or the outer side wall of the nut sleeve (40) at intervals, and the limit protrusions (43) are arranged in one-to-one correspondence with the limit grooves (52).

9. The electronic expansion valve according to claim 4, characterized in that a tangential surface (200) is provided on a side wall of the nut sleeve (40), a flow passage (100) is formed between the tangential surface (200) and a side wall of the installation cavity (202), and the valve cavity (203) communicates with the interior of the housing (10) through the flow passage (100).

10. The electronic expansion valve according to claim 9, wherein a circulation port (53) is provided on the gland (50), the circulation port (53) is provided corresponding to the circulation channel (100), and the circulation channel (100) communicates with the interior of the housing (10) through the circulation port (53).