CN216843174U

CN216843174U - Electronic expansion valve

Info

Publication number: CN216843174U
Application number: CN202122619497.3U
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Current assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2022-06-28
Anticipated expiration: 2031-10-29

Abstract

The utility model provides an electronic expansion valve, includes disk seat and nut component, the nut component includes nut and nut connector, the nut connector is hollow annular structure, the nut with the nut connector is as inserts injection moulding, the disk seat includes the opening, the nut connector with opening press-fit, the top of opening with the top of nut connector flushes, and the axial depth of opening is impressed to control nut connector that can be comparatively easy, and the equipment of nut component and disk seat is comparatively convenient.

Description

Electronic expansion valve

[ technical field ] A method for producing a semiconductor device

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

[ background of the invention ]

A typical electronic expansion valve structure includes a support member including a fixing metal part inserted or pressed into a valve housing to achieve assembly fixing of the support member and the valve housing, however, the depth of insertion of the fixing metal part into the valve housing is not easily controlled.

[ summary of the invention ]

An object of the application is to provide an electronic expansion valve, including disk seat and nut component, nut component includes nut and nut connector, the nut connector is hollow annular structure, the nut with the nut connector is as inserts injection moulding, the disk seat includes the opening, the nut connector with opening press fit, the top of opening with the top of nut connector flushes.

The electronic expansion valve that this scheme provided, the axial degree of depth of opening is impressed to control nut connector that can be comparatively easy, and the equipment of nut component and disk seat is comparatively convenient.

[ description of the drawings ]

FIG. 1 is a cross-sectional view of an electronic expansion valve of the present application;

FIG. 2 is a cross-sectional view of the nut connector of FIG. 1;

FIG. 3 is a cross-sectional view of the nut connector and valve seat after they are connected;

FIG. 4 is a cross-sectional view of the valve cartridge screw assembly of FIG. 1;

fig. 5 is a cross-sectional view of the press-fitting tool during press-fitting.

Wherein the figures include the following reference numerals:

1 valve core screw rod component, 11 valve core component, 111 valve core supporting part, 112 peripheral wall part, 113 valve core sealing part, 12 elastic part, 15 screw rod component, 151 screw rod body part, 152 stop part 2 valve seat component, 21 valve seat, 22 first connecting pipe part, 23 second connecting pipe part, 211 valve port part, 211A valve port sealing part, 212 opening part, 3 nut component, 31 nut, 311 inner hole guiding part, 32 nut connecting body, 321 through hole part, 322 groove part, 323 recess part, 33 sliding ring, 34 spiral guide rail, 4 rotor component, 41 rotor magnet, 42 rotor connecting part, 43 rotor stopping part, 5 outer shell, first cavity 1A, second cavity 1B and balance channel 1C

[ detailed description ] embodiments

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Referring specifically to fig. 1-4, fig. 1 is a cross-sectional view of an electronic expansion valve according to the present application; FIG. 2 is a cross-sectional view of the nut connector of FIG. 1; FIG. 3 is a cross-sectional view of the nut connector and valve seat after they are connected; FIG. 4 is a cross-sectional view of the valve cartridge screw assembly of FIG. 1;

referring to fig. 1, in an embodiment, the electronic expansion valve provided by the present invention includes a valve body and a stator coil (not shown), wherein the stator coil is sleeved on the valve body, and the valve body includes a valve core screw assembly 1, a valve seat assembly 2, a nut assembly 3, a rotor assembly 4 and a housing 5. The stator coil of the electronic expansion valve is connected with the driving controller, after the driving controller is electrified, a pulse driving signal is sent to the stator coil, the stator coil generates a changing magnetic field, so that the rotor assembly 4 of the electronic expansion valve is driven to rotate forwards or reversely, the rotor assembly 4 is fixedly connected with the screw rod component 15 of the valve core screw rod component 1, and the rotor assembly 4 can synchronously drive the screw rod component 15 to rotate when rotating. The external thread is arranged on the screw rod part 15 of the valve core screw rod component 1, the internal thread is arranged on the inner hole part of the nut 31 of the nut component 3, the screw rod part 15 is in threaded fit with the nut 31, and when the rotor component 4 rotates, the screw rod part 15 can move along the axial direction, so that the valve core 11 can be driven to realize the opening and closing action of the valve opening part 211 (mentioned below).

With continued reference to fig. 1, the present embodiment provides a valve seat assembly 2 including a valve seat 21, a first piping portion 22, and a second piping portion 23. The first pipe receiving portion 22 and the second pipe receiving portion 23 are fixedly assembled with the valve seat 21. The valve seat 21 is provided with a valve port 211 near the center of the connection with the second pipe connecting portion 23, the valve core assembly 11 (mentioned below) is provided with a valve port sealing portion 211A (a portion forming a seal with the valve core assembly 11) which can be in sealing fit with the valve port 211, and in this embodiment, the valve seat 21 is integrally formed with the valve port 211 (of course, the valve port 211 can be formed in another component and then fixedly connected with the valve seat 21).

In the present embodiment, the first connecting pipe portion 22 and the second connecting pipe portion 23 are welded to the valve seat 21, but it is needless to say that the first connecting pipe portion 22 and the second connecting pipe portion 23 are not provided, and a flow path through which the refrigerant fluid passes may be directly provided in the valve seat 21, or the first connecting pipe portion 22 or the second connecting pipe portion 23 may be flange-sealed, for example, when the motor-operated valve is applied to an automobile air conditioner, a heat pump, or the like, where quick maintenance is required. In the present embodiment, the first piping part 22 and the second piping part 23 are provided as an example.

Referring to fig. 2 in conjunction with fig. 1, a nut assembly 3 is coaxially disposed in the valve body with the valve seat assembly 2, and the nut assembly 3 includes a nut 31, a nut connector 32, a sliding ring 33, and a spiral guide 34. The nut connecting body 32 has a substantially hollow annular structure, and the nut 31 is injection molded by using the nut connecting body 32 as an insert.

The outer edge of the upper side of the nut 31 is provided with a sliding ring 33 and a spiral guide rail 34, the sliding ring 33 can spirally rotate along the spiral guide rail 34 within a stroke range defined by the upper limit and the lower limit, and the sliding ring 33 and the spiral guide rail 34 are matched with the rotor assembly 4 for realizing stroke control of the electronic expansion valve between full opening and full closing.

The central inner hole of the nut 31 is provided with an inner hole guide portion 311 that is matched with the outer wall (specifically, the peripheral wall portion 112, which will be mentioned later) of the plug screw assembly 1, and when the electronic expansion valve performs opening and closing operations, the inner hole guide portion 311 can provide a guiding and guiding function for the plug screw assembly 1.

The upper end of the valve seat 21 is in the form of an opening that includes an open portion 212, and the nut connector body 32 and the open portion 212 are over-fit or interference fit, typically, the nut connecting body 32 of the nut assembly 3 can be pressed into the opening portion 212 of the valve seat 21 using a press-fitting tool, in the process of press-fitting the nut connecting body 32 and the opening 212, the circumferential side wall of the nut connecting body abuts against the inner wall of the opening 212, finally, the press-fitting tool abuts against the upper end of the opening 212, so that the press-fitting tool cannot further press the nut connector 32 into the opening 212, with the top of the opening 212 flush with the top of the nut connector 32, the top of the opening 212 and the top of the nut connecting body 32 are flush with each other in the present application means that the height difference between the top of the opening 212 and the top of the nut connecting body 32 is within 0.1 mm, because of inevitable process variations in the process of pressing the nut connecting body 32 into the opening 212 of the valve seat 21.

With the above arrangement, the depth of the nut connecting body 32 in the axial direction pressed into the opening 212 can be easily controlled, and the nut unit 3 and the valve seat 21 can be easily assembled.

In addition, in this embodiment, the upper surface of the nut connecting body 32 is substantially horizontal, the upper end surface of the valve seat 21 is also substantially horizontal, and the upper surface of the nut connecting body 32 is flush with the upper surface of the valve seat 21, through the above arrangement, in the process of pressing the nut connecting body 32 into the opening 212 of the valve seat 21 by using the press-fitting tool, the stress of the nut connecting body 32 is relatively uniform, and when the press-fitting tool abuts against the upper surface of the opening 212, the stress of the valve seat 21 is relatively uniform, so that the coaxiality of the nut assembly 3 and the valve seat 21 can be improved, the situation that the nut assembly 3 and the valve seat 21 are deflected is reduced, and the service life of the product is prolonged.

After the nut connecting body 32 and the opening portion 212 of the valve seat 21 are over-fitted or interference-fitted, the nut connecting body 32 and the valve seat 21 may be further welded and fixed, thereby increasing the connecting strength between them.

Referring to fig. 2, in the nut assembly 3 of the present application, the nut 31 is injection molded by using the nut connector 32 as an insert, and the nut connector 32 has a hollow ring structure and includes a through hole portion 321, the through hole portion 321 penetrates through upper and lower surfaces of the nut connector 32, and the through hole portion 321 and the nut 31 are injection molded.

In order to enhance the connection strength between the nut connection body 32 and the nut 31, the nut connection body 32 of the present application further includes a groove portion 322, the groove portion 322 is substantially formed by being recessed along the surface of the through hole portion 321, and when the nut connection body 32 is insert-molded, the injection molding material fills the space of the groove portion 322, so that the area of the joint between the nut connection body and the nut 31 can be increased, thereby increasing the connection strength between the two.

Referring to fig. 1, the rotor assembly 4 includes a rotor magnet 41, a rotor connecting portion 42, and a rotor stopper portion 43 (the rotor stopper portion 43 and the rotor magnet 41 may be integrally formed, and a separate assembly manner is adopted in this embodiment). The rotor assembly 4 may be fixedly connected (for example, by welding) with the screw rod component 15 of the valve core screw rod assembly 1 through the rotor connecting portion 42, and the rotor assembly 4 drives the screw rod component 15 to synchronously rotate under the driving of the stator coil. The rotor magnet 41 is provided with a rotor stopper 43 on the inner side thereof, and the rotor stopper 43 is engaged with the slide ring 33 and the spiral guide 34 of the nut 31 to restrict the rotor assembly 4 from rotating within a predetermined stroke range.

In addition, the electronic expansion valve provided by this embodiment further includes an outer casing 5 with an opening at one end, the outer casing 5 is sleeved outside the rotor assembly 4, and the opening of the outer casing 5 and the valve seat 21 are welded and sealed to form a closed accommodating cavity.

Referring to fig. 1 and 3, the electronic expansion valve of the present application includes a first cavity 1A and a second cavity 1B, where the first cavity 1A is substantially located above the nut connector 32, and the second cavity 1B is located below the nut connector 32, in the present application, the electronic expansion valve further includes a balance channel 1C, the balance channel 1C communicates the first cavity 1A and the second cavity 1B, an outer surface of the nut connector 32 forms at least a part of a sidewall of the balance channel (1C), and pressures in the two cavities can be balanced by the balance channel 1C.

Specifically, in this embodiment, the nut connecting body 32 is originally circular, the nut connecting body 32 further includes a recessed portion 323, the recessed portion 323 is recessed along the outer surface of the nut connecting body 32, the cross section of the nut connecting body 32 is non-circular, and the cross section of the inner wall of the opening 212 is circular, so that after the nut connecting body 32 and the valve seat 21 are assembled and fixed, a gap, i.e., the equilibrium channel 1C, is formed between the recessed portion 323 and the opening 212, so that the recessed portion 323 forms a part of the side wall of the equilibrium channel 1C, and the opening 212 forms a further part of the side wall of the equilibrium channel 1C, and fluid and air pressure can enter the second chamber 1B from the first chamber 1A through the gap between the recessed portion 323 and the opening 212 (i.e., the equilibrium channel 1C), or enter the first chamber 1A from the second chamber 1B through the gap between the recessed portion 323 and the opening 212 (i.e., the equilibrium channel 1C, pressure equalization of the first chamber 1A and the second chamber 1B can be achieved.

In this embodiment, the number of the concave portions 323 is 2, and the 2 concave portions 323 are arranged in a central symmetry manner, so that the pressures of the first chamber 1A and the second chamber 1B can be rapidly balanced.

Of course, the balance channel 1C may also take the following form: the nut connecting body 32 is provided with a hole portion which is a through hole penetrating the upper and lower surfaces of the nut connecting body 32, and the hole portion is located outside the through hole portion 321, and the hole portion forms the balance passage 1C. Of course, the formation of the equilibrium channel 1C may take the above two forms at the same time.

Referring to fig. 2, in the present embodiment, the nut connecting body 32 has a substantially ring-shaped structure, and in order to facilitate the injection molding of the nut assembly, the upper portion and the lower portion of the nut connecting body 32 are substantially the same, and particularly, the upper end portion, the lower end portion and the outer peripheral wall portion of the nut connecting body 32, and the nut connecting body 32 of the present embodiment has a cross section along which the upper end portion, the lower end portion and the outer peripheral wall portion of the nut connecting body 32 are symmetrically disposed. At this time, when the nut connecting body 32 is put into a mold for injection molding, it is possible to put any end face into the mold, and an error prevention function can be provided.

Referring to fig. 4, the valve core assembly 11 is substantially a structure having an opening at an upper end, a hollow interior, and a closed lower portion, and includes a valve core supporting portion 111, a peripheral wall portion 112, and a valve core sealing portion 113, in this embodiment, the valve core supporting portion 111 is a bushing, the peripheral wall portion 112 and the valve core sealing portion 113 are integrally formed, and the two components are fixedly connected to form the valve core assembly 11, wherein a distance from the valve core supporting portion 111 to a central axis of the valve core assembly 11 is shorter than a distance from the peripheral wall portion 112 to the central axis of the valve core assembly 11, and the valve core supporting portion 111 can abut against the screw rod supporting portion 154, so that the valve core assembly 11 can be supported on the screw rod component 15.

With reference to fig. 4, the spool screw assembly 1 mainly includes a spool assembly 11, an elastic component 12 and a screw component 15, the screw component 15 provided in this embodiment includes a screw body 151 and a stopping portion 152, in this embodiment, the stopping portion 152 is a bushing with a through hole at the center, a lower end portion of the screw body 151 extends into the spool assembly 11 and is fixedly connected with the stopping portion 152, the elastic component 12 is a spring, the elastic component 12 is located (limited) in the spool assembly 11, specifically, an upper end portion of the elastic component 12 abuts against the stopping portion 152, a lower end portion abuts against the bearing 14, and the bearing 14 is located (limited) in the spool assembly 11.

When the structure formed by the valve core assembly 11, the elastic member 12, the bearing 14 and the screw rod member 15 is not subjected to other external forces, the upper end of the elastic member 12 abuts against the stopper portion 152, the lower end of the elastic member 12 abuts against the bearing 14, and the valve core assembly 11 is subjected to the action of the elastic member 12, so that the upper end of the stopper portion 152 abuts against the valve core support portion 111.

With continued reference to fig. 2, the valve core assembly 11 is connected to the screw rod component 15 in a limiting manner, specifically, the lower end portion of the screw rod component 15 is located inside the valve core assembly 11, and the upper end portion is located outside the valve core assembly 11. The valve body supporting portion 111 can abut against the stopper portion 152 (for example, when the valve body assembly 11 does not abut against the valve port portion 211), and the lower end portion of the screw member 15 is not easily removed from the valve body assembly 11, in the present embodiment, the outer peripheral shape of the stopper portion 152 is substantially circular, and the through hole shape of the valve body supporting portion 111 is also substantially circular, so that the diameter of the stopper portion 152 is larger than the diameter of the through hole of the valve body supporting portion 111.

In addition, the outer contour shape of the stopper 152 and the shape of the through hole of the valve element support portion 111 may be alternatively or entirely different shapes, and it is easy to understand that only the valve element assembly 11 can be abutted against the stopper 152 and the screw member 15 is not disengaged.

Referring specifically to fig. 5, the press-fitting tool 6 of the present application includes a first press-fitting member 61 and a second press-fitting member 62, in the present embodiment, the first press-fitting member 61 includes a first receiving portion 611 and a nipple receiving portion 613, the second nipple 23 may be disposed in the nipple receiving portion 613 during the assembly of the nut assembly 3 and the valve seat assembly 2, the nipple receiving portion 613 may be in the form of a through hole or a blind hole, in the present embodiment, the nipple receiving portion 613 is in the form of a through hole, at least a portion of the valve body 21 is located in the first receiving portion 611, the first receiving portion 611 communicates with the nipple receiving portion 613, and a first stepped portion 614 is formed between the first receiving portion 611 and the nipple receiving portion 613, in the present embodiment, the cross-sectional shape of the nipple receiving portion 613 is circular, the cross-sectional shape of the first receiving portion 611 is also circular, the first receiving portion 611 is located axially above the nipple receiving portion 613, the first step portion 614 is thus annular, and the lower end surface of the valve seat 21 is supported by the first step portion 614, and in this embodiment, the upper end of the valve body 21 is higher than the first accommodation portion 611.

The first press-fitting member 61 further includes a notch portion 616, and the first nipple 22 can be put in along this notch portion 616 when the valve seat assembly 2 and the nut assembly 3 to be press-fitted are put in the first press-fitting member 61.

In this embodiment, the first press-fitting member 61 is further provided with a second accommodating portion 612, the second accommodating portion 612 is located axially above the first accommodating portion, and the cross section of the second accommodating portion 612 is also circular, so that a second step portion 615 is formed between the first accommodating portion 611 and the second accommodating portion 612, and the second step portion 615 is circular.

In this embodiment, the second press-fitting member 62 has a substantially closed-upper cylindrical structure, and an inner cavity thereof can be used for accommodating the nut assembly 3, an outer wall surface thereof is in guiding fit with an inner wall surface of the second accommodating portion 612, and the second press-fitting member 62 includes a press-fitting portion 621, and the press-fitting portion 621 is a portion where a lower end surface of the second press-fitting member 62 is located.

Of course, the upper end portion of the second press-fitting member 62 may be provided in a non-closed form.

The provision of the second accommodating portion 612 makes it possible to make the arrangement of the second press-fitting member 62 larger, and therefore the guide areas of the first and second press-fitting

members

61 and 62 larger, and to reduce the occurrence of deflection of the second press-fitting member 62 relative to the first press-fitting member 61 when the second press-fitting member 62 is press-fitted into the first press-fitting member 61.

During the process of assembling the nut component 3 and the valve seat component 2, the press-fitting portion 621 will first abut against the nut connecting body 32, and during the process of gradually pressing the nut connecting body 32 downward by the second press-fitting member 62, the nut connecting body 32 will gradually displace relative to the valve seat 21 until the press-fitting portion 621 of the second press-fitting member 62 abuts against both the valve seat 21 and the nut connecting body 32, and the press-fitting is completed.

Therefore, after the valve seat 21 and the nut member 3 to be press-fitted are put into the first press-fitting part 61, an orthogonal projection of the press-fitting portion 621 along a plane in which a cross section of the first press-fitting part 61 is located has an overlapping region with an orthogonal projection of the upper end portion of the valve seat 21 along the plane and also has an overlapping region with an orthogonal projection of the upper end portion of the nut connecting body 32 along the plane.

It should be noted that the present invention mainly aims to improve the connection mode of the nut component 3 and the valve seat 21 of the electronic expansion valve, and other components of the electronic expansion valve, such as the valve core screw rod component 1 of the rotor component 4, and the like, can adopt a general technology, and can also adopt other electronic expansion valve structures which can realize the same function.

It should be noted that the term "against" in this specification includes direct and indirect against, and the term "support" in this specification includes direct support and indirect support, and the terms of orientation such as up, down, left, right, etc. mentioned in this embodiment are all introduced for convenience of description based on the drawings in this specification; and the use of ordinal numbers such as "first," "second," etc., in the part names, are also introduced for convenience of description and are not meant to imply any limitations on the order in which the parts are presented.

The electronic expansion valve provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. The utility model provides an electronic expansion valve, its characterized in that includes disk seat (21) and nut component (3), nut component (3) are including nut (31) and nut connector (32), nut connector (32) are hollow annular structure, nut (31) with nut connector (32) are as insert injection moulding, disk seat (21) are including opening (212), nut connector (32) with opening (212) press fit, the top of opening (212) with the top of nut connector (32) flushes.

2. An electronic expansion valve according to claim 1, wherein the upper surface of the nut connector (32) is substantially horizontal in form, the upper surface of the valve seat (21) is substantially horizontal in form, and the upper surface of the nut connector (32) and the upper surface of the valve seat (21) are flush.

3. An electronic expansion valve according to claim 1, wherein the nut connection body (32) and the valve seat (21) are welded.

4. The electronic expansion valve according to claim 1, wherein the nut connecting body (32) comprises a through hole portion (321), the through hole portion (321) penetrating upper and lower surfaces of the nut connecting body (32), and a groove portion (322), the groove portion (322) being recessed along a surface of the through hole portion (321).

5. An electronic expansion valve according to claim 1, wherein the electronic expansion valve comprises a first chamber (1A) and a second chamber (1B), the first chamber (1A) being located above the nut connector (32) and the second chamber (1B) being located below the nut connector (32), and further comprising a balancing channel (1C), the balancing channel (1C) communicating the first chamber (1A) and the second chamber (1B), an outer surface of the nut connector (32) forming at least part of a side wall of the balancing channel (1C).

6. An electronic expansion valve according to claim 5, wherein the nut connecting body (32) comprises hole portions penetrating upper and lower surfaces of the nut connecting body (32), the hole portions being located outside the through hole portion (321) of the nut connecting body (32), the hole portions forming at least part of the balancing passage (1C).

7. An electronic expansion valve according to claim 5, wherein the nut coupling body (32) comprises a recess (323), the recess (323) being recessed along an outer surface of the nut coupling body (32), the recess (323) forming part of a side wall of the equalization channel (1C), the opening (212) forming a side wall of a further part of the equalization channel (1C).

8. An electronic expansion valve according to claim 7, wherein the number of recesses (323) is 2, the 2 recesses being arranged centrosymmetrically.

9. An electronic expansion valve according to claim 1, wherein there is a cross section of the nut connecting body (32), and an upper end portion, a lower end portion and an outer peripheral wall portion of the nut connecting body (32) are provided axisymmetrically along the cross section.