WO2021057299A1

WO2021057299A1 - Valve core assembly and electronic expansion valve having same

Info

Publication number: WO2021057299A1
Application number: PCT/CN2020/108665
Authority: WO
Inventors: 贺宇辰; 冯晶
Original assignee: 浙江盾安人工环境股份有限公司
Priority date: 2019-09-24
Filing date: 2020-08-12
Publication date: 2021-04-01
Also published as: CN210920163U; JP7348318B2; KR20220028024A; JP2022545998A; KR102624443B1

Abstract

A valve core assembly, comprising a screw rod (10) and an annular structure (20). The annular structure (20) is a bushing or bearing; the screw rod (10) is of an integrally formed structure; the screw rod (10) comprises a first rod section (11) and a flange structure (12) disposed on one end of the first rod section (11); the radial dimension of the flange structure (12) is greater than the radial dimension of the first rod section (11); the first rod section (11) passes through the annular structure (20), and there is a gap between the circumferential surface of the first rod section (11) and the inner wall of the annular structure (20); the flange structure (12) is in limiting fit with one end of the annular structure (20).

Description

Spool assembly and electronic expansion valve with the same

Technical field

This application relates to the technical field of valves, and in particular to a valve core assembly and an electronic expansion valve having the same.

Background technique

In the valve core assembly of the existing electronic expansion valve, the bushing or the bearing is interference-fitted on the screw rod, and the bushing and the screw rod are fixed as a whole by laser welding. The coaxiality of the screw and valve needle is greatly affected by the installation position, and the structure of the nut and valve port of the electronic expansion valve is prone to coaxiality error after assembly, which will cause jamming between the valve needle and the valve port during use , At the same time, the friction is large, which affects the valve opening performance.

Application content

The present application provides a valve core assembly and an electronic expansion valve having the same, so as to solve the problem that the electronic expansion valve in the prior art is prone to jam during use.

In order to solve the above problems, according to one aspect of the present application, the present application provides a valve core assembly, including: a screw, the screw is an integrally formed structure, the screw includes a first rod section and a flange provided at one end of the first rod section Structure, the radial dimension of the flanging structure is greater than the radial dimension of the first rod section; the ring structure, the first rod section penetrates the ring structure, and there is a gap between the peripheral surface of the first rod section and the inner wall of the ring structure, The flanging structure is matched with one end of the ring structure, and the ring structure is a bushing or a bearing.

Further, the flanging structure has a bell mouth shape.

Further, the first rod section has a process hole, and the process hole is in communication with the hole of the flanging structure.

Further, the flanging structure is a stamping and forming structure.

Further, the screw further includes a second rod section, the second rod section is connected to the other end of the first rod section, the diameter of the second rod section is larger than the diameter of the first rod section, and the end surface of the second rod section is connected to the other end of the ring structure. One end is limited and matched, and the distance between the end surface of the second rod section and the flanging structure is greater than the axial dimension of the ring structure.

Further, the valve core assembly further includes: a first pressure sleeve, the second rod section penetrates the first pressure sleeve, a gap is provided between the peripheral surface of the second rod section and the inner wall of the first pressure sleeve, and the first pressure sleeve The end of the ring is in position-limiting fit with the end of the ring structure.

Further, the annular structure is a bushing, the outer wall of the bushing has a second limit step, and the valve core assembly further includes: an elastic member, one end of the elastic member is sleeved on the bush and abuts the second limit step; For the valve needle, the other end of the elastic member abuts against the valve needle.

Further, the annular structure is a bearing, and the valve core assembly further includes: a second compression sleeve, the end of the second compression sleeve abuts the bearing, and the outer wall of the second compression sleeve has a third limit step; an elastic member, an elastic member One end of the elastic member is sleeved on the second pressure sleeve and abuts against the third limit step; the valve needle, the other end of the elastic member abuts against the valve needle.

Further, one end of the second pressing sleeve facing the flanging structure has a tapered hole, and the tapered hole is used to avoid the flanging structure.

According to another aspect of the present application, an electronic expansion valve is provided. The electronic expansion valve includes the above-mentioned valve core assembly.

Applying the technical solution of the present application, a screw and a ring structure are provided in the valve core assembly, wherein the ring structure is a bushing or a bearing, the screw is an integrally formed structure, and the screw includes a first rod section and a rod set at one end of the first rod section. Flanging structure, the radial dimension of the flanging structure is greater than the radial dimension of the first rod section, the first rod section penetrates the ring structure, and there is a gap between the peripheral surface of the first rod section and the inner wall of the ring structure, The edge structure is in position-limiting cooperation with one end of the ring structure. Because there is a gap between the screw and the ring structure, the screw can move relative to the ring structure, so that part of the structure in the valve core assembly can be automatically adapted according to the coaxiality error of the electronic expansion valve nut and valve port during use. The position adjustment avoids the problem of easy jamming of the electronic expansion valve, and can reduce the friction between some structures and improve the valve opening performance.

Description of the drawings

The drawings of the specification forming a part of the application are used to provide a further understanding of the application, and the exemplary embodiments and descriptions of the application are used to explain the application, and do not constitute an improper limitation of the application. In the attached picture:

Fig. 1 shows a schematic structural diagram of a valve core assembly provided in Embodiment 1 of the present application;

Figure 2 shows a partial enlarged view of Figure 1;

Fig. 3 shows a schematic structural diagram of the valve core assembly in Fig. 1 applied to an electronic expansion valve;

FIG. 4 shows a schematic structural diagram of the valve core assembly provided in the second embodiment of the present application applied to an electronic expansion valve;

Fig. 5 shows a partial enlarged view of Fig. 4.

Among them, the above drawings include the following reference signs:

10. Screw; 11. First rod section; 12. Flanging structure; 13. Process hole; 14. Second rod section; 20. Ring structure; 30. First pressure sleeve; 40. Valve sleeve; 50. Elastic part ; 60, valve needle; 70, second pressure sleeve; 71, tapered hole.

detailed description

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative, and in no way serves as any restriction on the application and its application or use. Based on the embodiments in this application, all other embodiments obtained by a person of ordinary skill in the art without creative work shall fall within the protection scope of this application.

As shown in the drawings, the first embodiment of the present application provides a valve core assembly, including: a screw 10, the screw 10 is an integral structure, the screw 10 includes a first rod section 11 and one end of the first rod section 11 The flanging structure 12, the radial size of the flanging structure 12 is greater than the radial size of the first rod section 11; the ring structure 20, the first rod section 11 is inserted in the ring structure 20, the circumferential surface of the first rod section 11 There is a gap with the inner wall of the ring structure 20, the flanged structure 12 is in positional fit with one end of the ring structure 20, and the ring structure 20 is a bushing or a bearing.

Applying the technical solution of the present application, a screw 10 and an annular structure 20 are provided in the valve core assembly, wherein the annular structure 20 is a bushing or a bearing, the screw 10 is an integral structure, and the screw 10 includes a first rod section 11 and a first rod section 11 A flanging structure at one end of a rod section 11, the radial dimension of the flanging structure is greater than the radial dimension of the first rod section 11, the first rod section 11 penetrates the annular structure 20, and the peripheral surface of the first rod section 11 There is a gap with the inner wall of the ring structure 20, and the flanging structure is in position-limiting fit with one end of the ring structure 20. Since there is a gap between the screw 10 and the ring structure 20, the screw 10 can move relative to the ring structure 20, so that part of the structure in the valve core assembly can be automatically adjusted according to the coaxiality error of the electronic expansion valve nut and valve port during use. The adaptive position adjustment avoids the problem of easy jamming of the electronic expansion valve, and can reduce the friction between some structures and improve the valve opening performance.

In this embodiment, the flanging structure 12 has a bell mouth shape. Setting the flanging structure 12 in a bell mouth shape can facilitate the assembly and disassembly of the ring structure 20 and facilitate the processing and forming of the flanging structure 12. Optionally, the included angle between the side wall of the flanging structure 12 and the axial direction of the first rod section 11 is 40 degrees to 50 degrees.

In this embodiment, the flanging structure 12 is a stamping and forming structure. The stamping and forming method can facilitate the processing and forming of the flanging structure 12, with simple process and low cost.

Further, the first rod section 11 has a process hole 13, and the process hole 13 is in communication with the hole of the flanging structure 12. By providing the process hole 13, the flanging structure 12 is easily formed. The process hole 13 is used to avoid punching and forming tools.

In this embodiment, the screw 10 further includes a second rod section 14, the second rod section 14 is connected to the other end of the first rod section 11, the diameter of the second rod section 14 is greater than the diameter of the first rod section 11, and the second rod section 14 is connected to the other end of the first rod section 11. The end surface of the rod section 14 is in positional fit with the other end of the ring structure 20, and the distance between the end surface of the second rod section 14 and the flanging structure 12 is greater than the axial dimension of the ring structure 20. In this way, the two ends of the ring structure 20 can be restricted by the second rod section 14 and the flanging structure 12, and the distance between the end surface of the second rod section 14 and the flanging structure 12 is greater than the axis of the ring structure 20. The axial dimension can make the annular structure 20 and the screw 10 have a certain relative displacement in the axial direction, so as to adjust the position and adapt to the assembly error.

In this embodiment, the valve core assembly further includes: a first pressure sleeve 30, the second rod section 14 is inserted through the first pressure sleeve 30, and the peripheral surface of the second rod section 14 is different from the inner wall of the first pressure sleeve 30. There is a gap therebetween, and the end of the first compression sleeve 30 and the end of the ring structure 20 are in position-limiting fit. The first compression sleeve 30 can limit the ring structure 20. Optionally, the outer wall of the first compression sleeve 30 has a first limit step, the valve core assembly further includes: a valve sleeve 40, a part of the first compression sleeve 30 penetrates the valve sleeve 40, and the first limit step It abuts against the end surface of the valve sleeve 40 for positioning and limiting. In this embodiment, the ring structure 20 is a bushing.

In this embodiment, the annular structure 20 is a bushing, and the outer wall of the bushing has a second limit step. The valve core assembly further includes an elastic member 50. One end of the elastic member 50 is sleeved on the bushing and is connected to the second The limit step abuts; the valve needle 60, the other end of the elastic member 50 abuts the valve needle 60. The valve needle 60 is used to block the valve port of the electronic expansion valve, and the elastic member 50 can play a role of pre-tensioning the valve needle 60.

In the second embodiment, the difference from the above-mentioned embodiment is that the annular structure 20 is a bearing, and the valve core assembly further includes: a second pressure sleeve 70, the end of the second pressure sleeve 70 abuts against the bearing, and the second pressure sleeve 70 There is a third limit step on the outer wall; the elastic member 50, one end of the elastic member 50 is sleeved on the second compression sleeve 70 and abuts the third limit step; the valve needle 60, the other end of the elastic member 50 and the valve The needle 60 abuts. By providing the second compression sleeve 70, the elastic member 50 can be spaced from the bearing, thereby protecting the bearing and improving reliability. Specifically, the second pressure sleeve 70 abuts against the outer ring of the bearing.

Optionally, the valve core assembly further includes a valve sleeve 40, the screw 10 is inserted in the valve sleeve 40, the bearing is located in the valve sleeve 40, and one end of the valve sleeve 40 has an annular limiting structure, and the annular limiting structure is connected to the outer ring of the bearing. Limit coordination. The end surface of the second rod section 14 of the screw 10 is in a limit fit with the inner ring of the bearing.

In this embodiment, the end of the second pressing sleeve 70 facing the flanging structure 12 has a tapered hole 71, and the tapered hole 71 is used to avoid the flanging structure 12. Through the above arrangement, interference between the flanging structure 12 and the second pressing sleeve 70 can be avoided.

Another embodiment of the present application provides an electronic expansion valve, which includes the valve core assembly provided above. Applying the technical solution of this embodiment, a screw 10 and an annular structure 20 are provided in the valve core assembly, wherein the annular structure 20 is a bushing or a bearing, the screw 10 is an integrally formed structure, and the screw 10 includes a first rod section 11 and an The flanging structure at one end of the first rod section 11 has a radial dimension greater than that of the first rod section 11. The first rod section 11 penetrates the annular structure 20, and the circumference of the first rod section 11 There is a gap between the surface and the inner wall of the ring structure 20, and the flanging structure is in position-limiting fit with one end of the ring structure 20. Since there is a gap between the screw 10 and the ring structure 20, the screw 10 can move relative to the ring structure 20, so that part of the structure in the valve core assembly can be automatically adjusted according to the coaxiality error of the electronic expansion valve nut and valve port during use. The adaptive position adjustment avoids the problem of easy jamming of the electronic expansion valve, and can reduce the friction between some structures and improve the valve opening performance.

In this application, there is a clearance fit between the screw and the compression sleeve, and between the screw and the bushing (or bearing). The bushing is locked in the screw by flanging. After assembly, the flanging position can be controlled to make the screw and The bushings can be rotated freely, while ensuring the connection strength between the bushing and the screw; the bushing is on the pressure sleeve, and the screw can be moved within a certain range through the gap; through the design of the flanging wall thickness and the flanging amount, Ensure the connection strength between the screw and the bushing; this solution avoids jamming during product assembly due to the coaxiality error between the nut and the valve port; at the same time, it reduces the friction between the screw bushing assembly and the pressure sleeve, Conducive to the improvement of the valve opening performance of the product.

The above descriptions are only preferred embodiments of the application, and are not intended to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

A valve core assembly is characterized in that it comprises:

Screw (10), the screw (10) is an integral structure, the screw (10) includes a first rod section (11) and a flanging structure (12) provided at one end of the first rod section (11) ), the radial dimension of the flanging structure (12) is greater than the radial dimension of the first rod section (11);

The annular structure (20), the first rod section (11) penetrates the annular structure (20), and the peripheral surface of the first rod section (11) is between the inner wall of the annular structure (20) There is a gap therebetween, the flanging structure (12) is in positional fit with one end of the ring structure (20), and the ring structure (20) is a bush or a bearing.
The valve core assembly according to claim 1, wherein the flanging structure (12) has a bell mouth shape.
The valve core assembly according to claim 2, wherein the first rod section (11) has a process hole (13), and the process hole (13) is in communication with the hole of the flanging structure (12) .
The valve core assembly according to claim 2, wherein the flanging structure (12) is a stamping and forming structure.
The valve core assembly according to claim 1, wherein the screw (10) further comprises a second rod section (14), the second rod section (14) and the first rod section (11) The diameter of the second rod section (14) is greater than the diameter of the first rod section (11), and the end surface of the second rod section (14) is connected to the other end of the ring structure (20). One end is limited and matched, and the distance between the end surface of the second rod section (14) and the flanging structure (12) is greater than the axial dimension of the ring structure (20).
The valve core assembly of claim 5, wherein the valve core assembly further comprises:

The first pressure sleeve (30), the second rod section (14) penetrates the first pressure sleeve (30), and the peripheral surface of the second rod section (14) is connected to the first pressure sleeve There is a gap between the inner walls of (30), and the end of the first pressure sleeve (30) is in position-limiting fit with the end of the ring structure (20).
The valve core assembly according to claim 1, wherein the annular structure (20) is a bushing, and the outer wall of the bushing has a second limit step, and the valve core assembly further comprises:

An elastic member (50), one end of the elastic member (50) is sleeved on the bush and abuts against the second limit step;

The valve needle (60), and the other end of the elastic member (50) abuts against the valve needle (60).
The valve core assembly according to claim 1, wherein the annular structure (20) is a bearing, and the valve core assembly further comprises:

A second pressure sleeve (70), the end of the second pressure sleeve (70) abuts against the bearing, and the outer wall of the second pressure sleeve (70) has a third limit step;

An elastic piece (50), one end of the elastic piece (50) is sleeved on the second pressing sleeve (70) and abuts against the third limit step;

The valve needle (60), and the other end of the elastic member (50) abuts against the valve needle (60).
The valve core assembly according to claim 8, characterized in that the end of the second pressing sleeve (70) facing the flanging structure (12) has a tapered hole (71), and the tapered hole ( 71) Used to avoid the flanging structure (12).
An electronic expansion valve, characterized in that the electronic expansion valve comprises the valve core assembly according to any one of claims 1-9.