CN212360803U

CN212360803U - Electronic expansion valve

Info

Publication number: CN212360803U
Application number: CN201922288045.4U
Authority: CN
Inventors: 袁波锋
Original assignee: Dunan Environment Technology Co Ltd
Current assignee: Dunan Environment Technology Co Ltd
Priority date: 2019-12-18
Filing date: 2019-12-18
Publication date: 2021-01-15
Anticipated expiration: 2029-12-18

Abstract

The utility model relates to a refrigeration technology field especially relates to electronic expansion valve. An electronic expansion valve comprises a sleeve, a first rotor, a second rotor, a sensor and a control panel, wherein the first rotor and the second rotor are arranged in the sleeve; the sensor is arranged on the outer side of the sleeve, is electrically connected with the control board and is used for detecting the rotating angle of the first rotor; the second rotor drives the first rotor to synchronously rotate, the first rotor and the second rotor are provided with a plurality of pairs of magnetic poles, and the number of magnetic pole pairs of the first rotor is N (N is a natural number and N is more than 0) times that of the number of magnetic pole pairs of the second rotor. The utility model has the advantages that: more polarity change signals can be detected, and the detection precision of angle rotation is improved.

Description

Electronic expansion valve

Technical Field

The utility model relates to a refrigeration technology field especially relates to electronic expansion valve.

Background

The throttle valve is one of four major components of a refrigeration cycle system, and is used for controlling the flow rate of a refrigerant by changing the throttle section, thereby playing a role in throttling and reducing pressure, and is generally installed between a condenser and an evaporator. The electronic expansion valve is provided with a sensor for detecting the rotation angle of the rotor assembly, the electronic expansion valve comprises a stator assembly and the rotor assembly, and the stator assembly drives the rotor assembly to rotate.

In the prior art, the number of the magnetic pole pairs of the rotor is less, the sensor cannot detect more polarity change signals, the number of the obtained polarity change signals is often far less than that of the drive signals of the stator component, and the detection precision is low.

SUMMERY OF THE UTILITY MODEL

Based on this, the utility model discloses to above-mentioned technical problem, provide electronic expansion valve, technical scheme is as follows:

an electronic expansion valve comprises a sleeve, a first rotor, a second rotor, a sensor and a control panel, wherein the first rotor and the second rotor are arranged in the sleeve; the sensor is arranged on the outer side of the sleeve, is electrically connected with the control board and is used for detecting the rotating angle of the first rotor; the second rotor drives the first rotor to synchronously rotate, the first rotor and the second rotor are provided with a plurality of pairs of magnetic poles, and the number of magnetic pole pairs of the first rotor is N (N is a natural number and N is more than 0) times that of the number of magnetic pole pairs of the second rotor.

It can be understood that the sensor detects the rotation angle of the first rotor, and the number of pole pairs of the first rotor is N times of the number of pole pairs of the second rotor, and the sensor can detect the polarity change signal of the number of pole pairs of the second rotor N times, so as to obtain higher resolution, thereby improving the detection accuracy of the sensor.

In one embodiment, the number of pole pairs of the first rotor is two or more times the number of pole pairs of the second rotor.

In one embodiment, the electronic expansion valve further includes a screw assembly, the screw assembly is disposed in the sleeve, the screw assembly includes a screw, and the screw is fixedly connected to the first rotor and the second rotor, respectively.

It can be understood that the screw is fixedly connected to the first rotor and the second rotor, respectively, so that the first rotor and the second rotor rotate synchronously, and the sensor detects the rotation angle of the first rotor, that is, the rotation angle of the second rotor.

In one embodiment, a bracket is arranged on the inner wall of the first rotor and/or the second rotor, and the bracket is fixedly connected with the screw rod.

In one embodiment, the bracket is provided with a mounting hole, and the screw rod is arranged in the mounting hole in a penetrating manner and is fixedly connected with the bracket.

In one embodiment, a plurality of through holes are formed in the end face of the support along the circumferential direction.

It can be understood that the bracket is provided with a through hole to reduce the weight of the bracket, thereby avoiding affecting the driving force of the second rotor to the screw.

In one embodiment, a first support is arranged on the inner wall of the first rotor, a first boss is arranged on the end face, facing the second rotor, of the first support, and the first boss abuts against the second rotor.

In one embodiment, a second support is arranged on the inner wall of the second rotor, a second boss is arranged on the end face, facing the first rotor, of the second support, and the second boss abuts against the first boss.

It will be appreciated that the first boss abuts the second boss to maintain the first rotor and the second rotor moving synchronously along the screw.

In one embodiment, the electronic expansion valve further comprises a stator assembly and a rotor assembly, the stator assembly is arranged outside the sleeve, the rotor assembly is arranged inside the sleeve, and the stator assembly is used for driving the rotor assembly to move.

It will be appreciated that the stator assembly is energized to generate a magnetic field to rotate the second rotor assembly to move the screw in the axial direction.

In one embodiment, the stator assembly includes a housing, and the control board is disposed in the housing and electrically connected to the sensor.

Compared with the prior art, the utility model provides an electronic expansion valve through setting up the rotor subassembly into first rotor and second rotor, the magnetic pole logarithm of first rotor is the natural number multiple of the magnetic pole logarithm of second rotor, through the polarity change signal that detects first rotor to can obtain the polarity change signal of N times magnetic pole logarithm, improve the angle detection precision.

Drawings

Fig. 1 is a schematic structural diagram of an electronic expansion valve provided by the present invention;

fig. 2 is a partially enlarged view of a portion a in fig. 1.

The symbols in the drawings represent the following meanings:

100. an electronic expansion valve; 10. a valve body; 11. a valve cavity; 12. a valve port; 20. a valve core assembly; 21. a valve needle; 22. an elastic element; 23. a bearing; 24. a gasket; 30. a screw assembly; 31. a screw; 32. a nut seat; 40. a sleeve; 50. a rotor assembly; 51. a first rotor; 511. a first bracket; 5111. a first boss; 52. a second rotor; 521. a second bracket; 5211. a second boss; 60. a stator assembly; 61. a coil; 62. a housing; 70. a control panel; 80. a sensor.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and fig. 2, the present invention provides an electronic expansion valve 100, which is applied to a refrigeration system to achieve throttling and pressure reducing functions, where the refrigeration system is an air conditioner, a cold chain system, etc., and of course, in other embodiments, the electronic expansion valve 100 may also be applied to a cold chain system, a household or commercial air conditioning system, or other systems.

Specifically, referring to fig. 1, the electronic expansion valve 100 includes a valve body 10, a valve core assembly 20 and a screw assembly 30, the screw assembly 30 is mounted on the valve body 10, one end of the screw assembly 30 is connected to the valve core assembly 20, the screw assembly 30 drives the valve core assembly 20 to move, and the valve core assembly 20 controls the electronic expansion valve 100 to open or close.

Further, the valve body 10 is provided with a valve cavity 11 and a valve port 12, the valve cavity 11 is disposed between the valve port 12 and the screw assembly 30, one end of the screw assembly 30 extends into the valve cavity 11, the valve core assembly 20 is disposed in the valve cavity 11, and the valve port 12 is used for the valve core assembly 20 to extend into, so as to block the medium in the electronic expansion valve 100 from flowing in or out through the valve port 12.

The valve core assembly 20 includes a valve needle 21 and an elastic element 22, one end of the valve needle 21 is connected with the elastic element 22, the other end extends out of the valve cavity 11 and moves along the axial direction of the valve port 12, and the valve needle 21 is matched with the valve port 12 to control the flow of the medium, the separation and the flow rate.

Referring to fig. 1, the electronic expansion valve 100 further includes a sleeve 40 and a rotor assembly 50, the sleeve 40 is fixed on the valve body 10, the rotor assembly 50 is disposed in the sleeve 40, and the rotor assembly 50 drives the screw assembly 30 to rotate. The sleeve 40 isolates the external environment from the spool assembly 20, the screw assembly 30, and the rotor assembly 50, thereby protecting the spool assembly 20, the screw assembly 30, and the rotor assembly 50 from media leakage.

Specifically, the screw assembly 30 includes a screw 31 and a nut seat 32, one end of the screw 31 is disposed in the sleeve 40, the nut seat 32 is fixed on the valve body 10 and is in threaded connection with the screw 31, and the screw 31 rotates relative to the nut seat 32, so as to drive the screw 31 to move telescopically relative to the nut seat 32.

Further, a bearing 23 is arranged between the screw assembly 30 and the valve core assembly 20, the bearing 23 is installed at one end of the screw 31, the screw 31 is arranged in an inner ring of the bearing 23 in a penetrating manner, when the screw 31 rotates to drive the inner ring of the bearing 23 to rotate, an outer ring of the bearing 23 does not rotate, and therefore friction force generated on the valve core assembly 20 due to rotation of the screw 31 is reduced. In the present embodiment, the bearing 23 is a roller bearing, but in other embodiments, other bearings may be used.

A gasket 24 is arranged between the bearing 23 and the valve core assembly 20, one end of the gasket 24 is connected with the outer ring of the bearing 23 and is arranged at an interval with the inner ring of the bearing 23, the other end of the gasket is abutted against the elastic element 22, and the bearing 23 presses the valve core assembly 20 through the gasket 24, so that the stress of the valve core assembly 20 is uniform. The washer 24 is connected to the outer ring of the bearing 23, so that the washer 24 is prevented from rotating when the screw 31 rotates, and the spool assembly 20 is driven to rotate, that is, the spool assembly 20 only moves axially without rotating.

The electronic expansion valve 100 further comprises a stator assembly 60, the stator assembly 60 comprises a coil 61, the coil 61 is arranged outside the sleeve 40, the coil 61 generates a magnetic field after being electrified, and the rotor assembly 50 is driven to rotate under the action of the magnetic field, so that the screw assembly 30 is driven.

Further, the electronic expansion valve 100 further includes a control board 70, the stator assembly 60 further includes a housing 62, and the coil 61 and the control board 70 are disposed in the housing 62.

Referring to fig. 1, the rotor assembly 50 includes a first rotor 51 and a second rotor 52, and the first rotor 51 and the second rotor 52 are respectively fixedly connected to the screw 31.

The stator assembly 60 drives the second rotor 52 to rotate, the second rotor 52 drives the first rotor 51 to rotate, the first rotor 51 and the second rotor 52 both have multiple pairs of magnetic poles, the number of magnetic pole pairs of the first rotor 51 is N times of the number of magnetic pole pairs of the second rotor 52, wherein N is a natural number greater than 0. Here, the first rotor 51 and the second rotor 52 are permanent magnets.

It can be understood that the rotation angle of the second rotor 52 can be detected by detecting the rotation angle of the first rotor 51, and the number of pole pairs of the first rotor 51 is N times the number of pole pairs of the second rotor 52, so that the polarity change signal of the number of pole pairs of the second rotor 52 which is N times the number of pole pairs of the second rotor 52 can be detected, and higher resolution and higher detection accuracy can be obtained.

Further, by setting the number of pairs of magnetic poles in the first rotor 51 to be greater than the number of pairs of magnetic poles in the second rotor 52 and detecting the rotation angle of the first rotor 51, it is possible to avoid directly setting more pairs of magnetic poles in the second rotor 52 and reduce the driving force of the second rotor 52 with respect to the screw 31.

Preferably, in the present embodiment, the number of pole pairs of the first rotor 51 is twice that of the second rotor 52, which can avoid complexity of the process and improve the detection accuracy, and of course, in other embodiments, the number of pole pairs of the first rotor 51 may be set to be the same as that of the second rotor 52, or twice or more.

The first rotor 51 and the second rotor 52 are separately arranged, so that the first rotor 51 can be independently magnetized, and the operation is convenient.

Referring to fig. 2, a bracket is disposed on an inner wall of the first rotor 51 and/or the second rotor 52, and the bracket is fixedly connected to the screw 31.

Further, the inner wall of the first rotor 51 is provided with a first bracket 511, the first bracket 511 is provided with a first boss 5111 facing the end face of the second rotor 52, and the first boss 5111 abuts against the second rotor 52.

The inner wall of the second rotor 52 is provided with a second bracket 521, the end surface of the second bracket 521 facing the first rotor 51 is provided with a second boss 5211, and the second boss 5211 is abutted against the first boss 5111.

It will be appreciated that the second boss 5211 abuts against the first boss 5111 to prevent the first rotor 51 from moving relative to the second rotor 52, i.e., to ensure that the first rotor 51 and the second rotor 52 move synchronously along the axial direction of the screw 31.

Mounting holes (not labeled) are formed in the first boss 5111 and the second boss 5211, and the screw 31 penetrates through the mounting holes and is fixedly connected with the first boss 5111 and the second boss 5211. In this embodiment, the screw 31 is fixed in the mounting hole by welding, and in other embodiments, the first boss 5111 and the second boss 5211 may also be fixed and connected to the screw 31 by snapping, bonding, or other methods.

Preferably, a plurality of through holes (not labeled) are formed in the end surfaces of the first bracket 511 and the second bracket 521 along the circumferential direction, so as to reduce the weight of the first bracket 511 and the second bracket 521, and avoid affecting the driving force of the second rotor 52 on the screw 31.

The electronic expansion valve 100 further includes a sensor 80 for detecting a rotation angle of the first rotor 51, wherein the sensor 80 is disposed on an outer wall of the sleeve 40 and electrically connected to the control board 70. In this embodiment, a hall sensor is used as the angle sensor, and in other embodiments, other sensors may be used for detection according to different designs.

The sensor 80 can continuously detect the rotation angle of the first rotor 51, and the rotation angle of the first rotor 51 is proportional to the change in the axial position of the valve element along the electronic expansion valve 100, and the axial position data of the valve element, that is, the opening degree of the electronic expansion valve 100 is converted from the detected rotation angle.

In the working process, the stator assembly 60 drives the second rotor 52 to rotate according to the received driving signal, the second rotor 52 drives the first rotor 51 and the screw 31 to rotate together, the screw 31 extends and retracts along the axial direction of the electronic expansion valve 100 while rotating because the nut seat 32 is limited by the valve body 10, the valve core is driven by the extension and retraction of the screw 31 to extend and retract, the sensor 80 detects the rotation angle of the first rotor 51 according to the sensed change signal of the magnetic pole, and converts the axial position data of the valve core to detect the opening degree of the electronic expansion valve 100.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. An electronic expansion valve is characterized by comprising a sleeve (40), a first rotor (51), a second rotor (52), a sensor (80) and a control board (70), wherein the first rotor (51) and the second rotor (52) are arranged in the sleeve (40); the sensor (80) is arranged on the outer side of the sleeve (40), is electrically connected with the control board (70) and is used for detecting the rotation angle of the first rotor (51);

the second rotor (52) drives the first rotor (51) to synchronously rotate, the first rotor (51) and the second rotor (52) are provided with a plurality of pairs of magnetic poles, the number of magnetic pole pairs of the first rotor (51) is N times that of the number of magnetic pole pairs of the second rotor (52), and N is a natural number and is greater than 0.

2. An electronic expansion valve according to claim 1, wherein the number of pole pairs of the first rotor (51) is two times and more than the number of pole pairs of the second rotor (52).

3. An electronic expansion valve according to claim 1, further comprising a screw assembly (30), wherein the screw assembly (30) is disposed within the sleeve (40), and wherein the screw assembly (30) comprises a screw (31), and wherein the screw (31) is fixedly connected to the first rotor (51) and the second rotor (52), respectively.

4. An electronic expansion valve according to claim 3, wherein a bracket is arranged on the inner wall of the first rotor (51) and/or the second rotor (52), and the bracket is fixedly connected with the screw (31).

5. The electronic expansion valve according to claim 4, wherein the bracket is provided with a mounting hole, and the screw rod (31) is inserted into the mounting hole and fixedly connected with the bracket.

6. The electronic expansion valve according to claim 4, wherein the end surface of the bracket has a plurality of through holes formed along a circumferential direction.

7. An electronic expansion valve according to claim 1, wherein a first bracket (511) is arranged on an inner wall of the first rotor (51), a first boss (5111) is arranged on an end surface of the first bracket (511) facing the second rotor (52), and the first boss (5111) abuts against the second rotor (52).

8. The electronic expansion valve according to claim 7, wherein a second bracket (521) is disposed on an inner wall of the second rotor (52), a second boss (5211) is disposed on an end surface of the second bracket (521) facing the first rotor (51), and the second boss (5211) abuts against the first boss (5111).

9. The electronic expansion valve according to claim 1, further comprising a stator assembly (60) and a rotor assembly (50), wherein the stator assembly (60) is disposed outside the casing (40), the rotor assembly is disposed inside the casing (40), and the stator assembly (60) is configured to drive the rotor assembly (50) to move.

10. An electronic expansion valve according to claim 9, wherein the stator assembly (60) comprises a housing (62), and the control board (70) is arranged in the housing (62) and electrically connected to the sensor (80).