WO2022247835A1

WO2022247835A1 - Electronic expansion valve

Info

Publication number: WO2022247835A1
Application number: PCT/CN2022/094769
Authority: WO
Inventors: 冯忠波
Original assignee: 浙江盾安人工环境股份有限公司
Priority date: 2021-05-24
Filing date: 2022-05-24
Publication date: 2022-12-01
Also published as: CN215806346U; JP2024518887A; KR20240005004A

Abstract

Disclosed is an electronic expansion valve, comprising: a rotor (10); a connecting plate (20) at least partially connected to the rotor (10) and provided with a through hole (21) and a mounting groove (22), the through hole (21) being disposed at the bottom of the mounting groove (22); a screw (30) passing through the through hole (21) and the mounting groove (22); and a limiting piece (40) provided in the mounting groove (22) and fixedly connected to the screw (30), the rotor (10) is matched with the mounting groove (22) by means of the limiting piece (40) to drive the screw to rotate. The connecting plate (20) is provided with a material holding groove (23), and the material holding groove (23) is disposed at the bottom of the mounting groove (22) and arranged close to an edge of the mounting groove (22). The problem in the prior art that the mounting groove and the limiting piece cannot be fitted completely can be solved.

Description

Electronic expansion valve

This application claims the priority of the patent application with the application number 202121123205.0 and the invention name "electronic expansion valve" submitted to the State Intellectual Property Office of China on May 24, 2021.

technical field

The present application relates to the field of electronic expansion valves, in particular, to an electronic expansion valve.

Background technique

Existing electronic expansion valves generally use a rotor to drive the screw to rotate. The rotor is connected to the screw rod through the connecting plate. Specifically, the connecting plate is provided with a mounting groove, the screw rod is passed through the mounting groove, the limiting plate is pressed into the mounting groove, and the limiting plate is fixedly connected with the screw rod. During the installation process of the above components, the limit piece and the installation groove on the connecting plate are extruded and rubbed against each other. Since the connecting plate is generally made of injection molding material, part of the injection molding material will be limited after the edge of the installation groove is squeezed. The chip is squeezed and cut off, and the scraped debris is squeezed between the limit plate and the bottom surface of the installation groove, which will cause the limit plate to fail to fit with the bottom surface of the installation groove, and eventually cause the inner hole of the limit plate to connect with the rotor. The coaxiality of the hole in the plate is poor, which affects the positioning accuracy of the valve head fixed at the end of the screw.

Utility model content

The present application provides an electronic expansion valve to solve the problem in the prior art that the installation groove and the limit piece cannot be completely fitted.

The application provides an electronic expansion valve. The electronic expansion valve includes: a rotor; a connecting plate, the connecting plate is at least partially connected to the rotor, the connecting plate is provided with a through hole and a mounting groove, and the through hole is disposed at the bottom of the mounting groove; a screw, The screw rod is set on the through hole and the installation groove; the limit piece is set in the installation groove, the limit piece is fixedly connected with the screw rod, and the rotor drives the screw to rotate through the limit piece and the installation groove; the connection plate is set There is a material storage tank, the material storage tank is arranged at the bottom of the installation tank, and the material storage tank is arranged near the edge of the installation tank.

Further, the material holding tank is annular.

Further, the centerlines of the through hole, the centerline of the installation groove and the centerline of the storage groove coincide with each other.

Further, the width of the material storage tank is 0.5 mm to 1.5 mm, and the depth of the material storage tank is 0.5 mm to 1.5 mm.

Further, there are a plurality of storage tanks arranged at intervals at the bottom of the installation tank.

Further, the installation groove has a guiding section and a limiting section connected in sequence, the limiting section is located below the guiding section, and the circumferential dimension of the guiding section is larger than that of the limiting section.

Further, the distance from the top edge of the limiting section to the bottom edge of the guiding section is 0.01 mm to 0.05 mm.

Further, the cross-sectional shapes of the guide segment and the limiting segment are adapted to the cross-sectional shape of the limiting piece.

Further, the installation groove has a first anti-rotation structure, and the limiting plate has a second anti-rotation structure matched with the first anti-rotation structure.

Applying the technical solution of the present application, a material storage tank is provided on the bottom edge of the installation groove, so that the debris that falls from the friction between the installation groove and the limit piece can enter the material storage tank, thereby preventing the debris from being squeezed into the Between the limit piece and the bottom surface of the installation groove, ensure that the limit piece is completely attached to the bottom of the installation groove, thereby ensuring the coaxiality between the limit piece, the rotor connecting plate and the screw, so that the valve head at the end of the screw can be accurately Move and block to ensure the control accuracy of the electronic expansion valve.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide further understanding of the present application, and the schematic embodiments and descriptions of the present application are used to explain the present application, and do not constitute improper limitations to the present application. In the attached picture:

Figure 1 shows a schematic diagram of the internal structure of the electronic expansion valve provided by the present application;

Figure 2 shows a schematic diagram of the internal three-dimensional structure of the electronic expansion valve provided by the present application;

FIG. 3 shows a schematic diagram of a partial structure of the electronic expansion valve provided by the present application;

Fig. 4 shows a schematic diagram of a partial structure of the electronic expansion valve provided by the present application.

Wherein, the above-mentioned accompanying drawings include the following reference signs:

10, rotor; 20, connecting plate; 21, through hole; 22, installation slot; 221, guide section; 222, limit section; 223, first anti-rotation structure; Limiting plate; 41, the second anti-rotation structure.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as any limitation of the application, its application or uses. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

As shown in FIGS. 1-4 , Embodiment 1 of the present application provides an electronic expansion valve, including a rotor 10 , a connecting plate 20 , a screw 30 and a limiting plate 40 . Wherein, the rotor 10 is used to drive the screw 30 to rotate. Optionally, the rotor 10 is a magnetic rotor. The connecting plate 20 is at least partly connected with the rotor 10 , the connecting plate 20 is provided with a through hole 21 and a mounting groove 22 , and the through hole 21 is disposed at the bottom of the mounting groove 22 . The installation groove 22 is used for installing the limiting piece 40 . Optionally, the connecting plate 20 is an injection molding structure. The screw rod 30 passes through the through hole 21 and the installation groove 22 . The screw rod 30 is fixedly connected with the limiting piece 40 . The connection between the screw rod 30 and the connecting plate 20 is achieved through the cooperation of the installation groove 22 and the limiting plate 40 , and then the rotor 10 can drive the screw rod 30 to rotate through the connecting plate 20 .

In this embodiment, a material storage tank 23 is provided on the connecting plate 20 , the material storage tank 23 is arranged at the bottom of the installation groove 22 , and the material storage tank 23 is arranged near the edge of the installation groove 22 . Can make installation groove 22 and spacer 40 mutually extrude the chip that falls into the container trough 23 like this, thereby avoid chip to be extruded between spacer 40 and installation groove 22 bottom surfaces, make spacer 40 can be completely attached to the bottom of the installation groove 22, thereby avoiding the phenomenon of poor coaxiality between the inner hole of the limiting piece 40 and the inner hole of the rotor connecting plate 20, and the inner hole of the limiting piece 40 and the inner hole of the rotor connecting plate 20 are coaxial The poor degree of coaxiality of the screw rod 30 will lead to poor coaxiality, and then the valve head driven by the screw rod 30 cannot effectively seal the valve port, resulting in leakage of the valve port.

Wherein, the material holding tank 23 can be arranged in multiple sections, and the multi-section material holding tank 23 is arranged at the bottom of the installation tank 22 at intervals. In this embodiment, the material holding tank 23 is arranged in an annular shape. The material holding tank 23 can be a square annular groove, and can also be set as a circular annular groove. Specifically, the shape of the material holding groove 23 is adapted to the shape of the mounting groove 22, so that the material holding tank can be enlarged as much as possible. 23, so that the debris can completely fall into the container 23, to further ensure that the spacer 40 and the mounting groove 22 are fully fitted.

In this embodiment, the centerlines of the through hole 21 , the centerline of the installation groove 22 and the centerline of the storage groove 23 coincide with each other. This can ensure the overall coaxiality of the device and improve the accuracy of the valve body.

Specifically, the width of the storage tank 23 is 0.5 mm to 1.5 mm, and the depth of the storage tank 23 is 0.5 mm to 1.5 mm. The size of the material holding tank 23 is relatively small, and the strength of the connecting plate 20 can be ensured while ensuring enough space to accommodate debris through the above arrangement.

Wherein, the installation groove 22 has a guiding section 221 and a limiting section 222 connected in sequence. The limiting section 222 is located below the guiding section 221 . The circumferential dimension of the guiding section 221 is larger than that of the limiting section 222 . The limiting section 222 is used to install the limiting piece 40, the limiting piece 40 is installed in cooperation with the limiting section 222, and the guiding section 221 is set to guide the limiting piece 40, so that the limiting piece 40 is conveniently installed, and the limiting piece is realized. The quick alignment of 40 and the limiting section 222 improves the installation efficiency. Optionally, the inner wall of the guide section 221 is inclined, the bottom end of the guide section 221 coincides with the top end of the limiting section 222, and the circumferential dimension of the top end of the guiding section 221 is larger than the circumferential dimension of the top end of the limiting section. Of course, the circumferential dimension of the top end and the bottom end of the guide section 221 can also be consistent, and the circumferential dimension of the guide section 221 is larger than that of the limiting section.

In this embodiment, the distance between the inner wall of the limiting section 222 and the inner wall of the guiding section 221 is 0.01 mm to 0.05 mm. The circumferential dimension of the guide section 221 is slightly larger than that of the limiting section 222. If the dimension is smaller than 0.01 mm, it is difficult to put the limiting piece 40 into the guiding section 221. If the dimension is greater than 0.05 mm, it is difficult to play a guiding role. Therefore, designing the distance between the two inner walls between 0.01 mm and 0.05 mm can facilitate the installation of the limiting piece 40 and improve the accuracy of the guide.

Wherein, the cross-sectional shapes of the guide section 221 and the limiting section 222 are adapted to the cross-sectional shape of the limiting piece 40 . To ensure that the limiting section 222 and the limiting piece 40 are matched and fixed, so that when the connecting plate 20 rotates, the limiting piece 40 rotates with the connecting plate 20 . Specifically, in this embodiment, the size of the limiting piece 40 is slightly larger than that of the limiting section 222 , so that when the limiting piece 40 is installed in the limiting section 222 , the two can be closely attached and fastened.

Specifically, the installation groove 22 has a first anti-rotation structure 223 , and the limiting piece 40 has a second anti-rotation structure 41 matched with the first anti-rotation structure 223 . The limiting piece 40 and the mounting groove 22 are mutually locked, so that the limiting piece 40 rotates with the connecting plate 20 when the connecting plate 20 rotates, and then the screw rod 30 rotates with the connecting plate 20 .

In this embodiment, the installation groove 22 has a plurality of sides, and the plurality of sides form the first anti-rotation structure 223 , so that the installation groove 22 can be designed as a groove with a non-circular cross section. Correspondingly, the limiting piece 40 has multiple sides, and the multiple sides form the second anti-rotation structure 41 , so that the limiting piece 40 is designed as a block with a non-circular cross section. The first anti-rotation structure 223 cooperates with the second anti-rotation structure 41, so that the limiting piece 40 will not rotate relative to the mounting groove 22. In this embodiment, the section of the installation slot 22 is rectangular, and the outline of the limiting piece 40 is rectangular.

Embodiment 2 of the present application provides an electronic expansion valve, which is different from Embodiment 1 in that there are multiple storage tanks 23 arranged at intervals at the bottom of the installation tank 22 .

Through the technical solution provided by this application, a material holding tank 23 is provided at the bottom of the installation groove 22 to accommodate the debris that falls when the connecting plate 20 and the limiting piece 40 are squeezed, thereby preventing the debris from being squeezed to the limit. Between the spacer 40 and the bottom surface of the installation groove 22, ensure that the spacer 40 is completely attached to the bottom of the installation groove 22, thereby ensuring the coaxiality between the spacer 40, the rotor connecting plate 20, and the screw 30, so that the screw 30 The valve head at the end can be moved and blocked accurately to ensure the control accuracy of the electronic expansion valve; the installation groove 22 has a guide section 221 and a limit section 222 connected in sequence, the limit section 222 is located below the guide section 221, and the guide section The circumferential dimension of 221 is larger than the circumferential dimension of the limiting section 222. The guide section 221 is provided to facilitate the installation of the limiting piece 40, realize the quick alignment of the limiting piece 40 and the limiting section 222, and improve the installation efficiency.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

The relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. At the same time, it should be understood that, for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the Authorized Specification. In all examples shown and discussed herein, any specific values should be construed as illustrative only, and not as limiting. Therefore, other examples of the exemplary embodiment may have different values. It should be noted that like numbers and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

In the description of the present application, it should be understood that orientation words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" etc. indicate the orientation Or positional relationship is generally based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description. In the absence of a contrary statement, these orientation words do not indicate or imply the device or element referred to It must have a specific orientation or be constructed and operated in a specific orientation, so it should not be construed as limiting the protection scope of the present application; the orientation words "inner and outer" refer to the inner and outer relative to the outline of each component itself.

For the convenience of description, spatially relative terms may be used here, such as "on ...", "over ...", "on the surface of ...", "above", etc., to describe the The spatial positional relationship between one device or feature shown and other devices or features. 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 the device in the figures is turned over, devices described as "above" or "above" other devices or configurations would then be oriented "beneath" or "above" the other devices or configurations. under other devices or configurations". Thus, the exemplary term "above" can encompass both an orientation of "above" and "beneath". The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptions used herein interpreted accordingly.

In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing corresponding components. To limit the protection scope of this application.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, there may be various modifications and changes in the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims

An electronic expansion valve, characterized in that the electronic expansion valve comprises:

rotor (10);

A connecting plate (20), the connecting plate (20) is at least partially connected to the rotor (10), the connecting plate (20) is provided with a through hole (21) and a mounting groove (22), the through hole (21) arranged at the bottom of the installation groove (22);

A screw (30), the screw (30) is threaded through the through hole (21) and the installation groove (22);

A limiting piece (40), the limiting piece (40) is arranged in the installation groove (22), the limiting piece (40) is fixedly connected with the screw rod (30), and the rotor (10) Cooperating with the installation groove (22) through the limiting piece (40) to drive the screw rod (30) to rotate;

The connecting plate (20) is provided with a storage tank (23), the storage tank (23) is arranged at the bottom of the installation tank (22), and the storage tank (23) is close to the installation The edge of the slot (22) is set.
The electronic expansion valve according to claim 1, characterized in that, the storage tank (23) is annular.
The electronic expansion valve according to claim 2, characterized in that, the center line of the through hole (21), the center line of the installation groove (22) and the center line of the material holding tank (23) coincide with each other .
The electronic expansion valve according to claim 1, characterized in that, the width of the material holding groove (23) is 0.5 mm to 1.5 mm, and the depth of the material holding groove (23) is 0.5 mm to 1.5 mm.
The electronic expansion valve according to claim 1, characterized in that, there are multiple storage tanks (23) arranged at intervals at the bottom of the installation tank (22).
The electronic expansion valve according to claim 1, characterized in that, the installation groove (22) has a guide section (221) and a limiting section (222) connected in sequence, and the limiting section (222) is located at the Below the guide section (221), the circumferential dimension of the guide section (221) is larger than the circumferential dimension of the limiting section (222).
The electronic expansion valve according to claim 6, characterized in that the distance between the inner wall of the limiting section (222) and the inner wall of the guiding section (221) is 0.01 mm to 0.05 mm.
The electronic expansion valve according to claim 6, characterized in that, the cross-sectional shapes of the guide section (221) and the limiting section (222) are both the same as the cross-sectional shape of the limiting piece (40). adaptation.
The electronic expansion valve according to claim 1, characterized in that, the installation groove (22) has a first anti-rotation structure (223), and the limiting piece (40) has a structure compatible with the first anti-rotation structure (223). Cooperating second anti-rotation structure (41).