An electric valve

Abstract

An electric valve includes a stator assembly and a rotor assembly. The stator assembly is located outside the rotor assembly and includes a stator housing, a coil, and a frame. The frame provides support for the coil. The rotor assembly includes a magnetic rotor. The electric valve also includes a position sensor. The position sensor includes a body with a sensing portion located radially around the magnetic rotor. The electric valve also includes a magnetic conductor located between the stator housing and the body of the position sensor along the extension direction of the rotor's rotating axis. This solution reduces interference with the position sensor caused by magnetic flux leakage from the stator assembly, thereby improving detection reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid control, and in particular to an electric valve. Background Art

[0002] The electric valve includes a stator assembly and a rotor assembly. The stator assembly is located at the outer periphery of the rotor assembly. The rotor assembly includes a magnetic rotor. In order to detect whether the magnetic rotor is operating normally, a position sensor can be set on the periphery of the magnetic rotor to detect changes in the N and S poles of the magnetic field of the magnetic rotor, thereby obtaining the operating status of the rotor assembly. However, the position sensor may be interfered by the leakage magnetic field of the stator assembly. When the leakage magnetic field of the stator assembly is close to the action value of the position sensor, and the magnetic field generated by the magnetic rotor is weak at the sensing point of the position sensor, the position sensor may be activated due to the leakage magnetic field of the stator assembly, thereby causing misjudgment. Therefore, how to use a simple structure to reduce the interference of the position sensor with the leakage magnetic field of the stator assembly is a problem that technicians in this field need to consider. Summary of the Invention

[0003] The purpose of this application is to provide an electric valve that uses a simple structure to reduce the interference of stator component leakage magnetic field on position sensor detection, which is conducive to improving the reliability of detection.

[0004] To achieve the above object, one embodiment of the present invention adopts the following technical solution:

[0005] An electric valve includes a stator assembly and a rotor assembly, wherein the stator assembly is located at the outer periphery of the rotor assembly, the stator assembly is a claw-pole stator assembly, the stator assembly includes a stator housing, a coil and a skeleton, the skeleton provides support for the coil, the stator housing is located at the outer periphery of the coil, the rotor assembly includes a magnetic rotor, and the magnetic rotor rotates around a rotor rotation axis. The electric valve also includes a position sensor, which includes a main body portion having a sensing portion, and the sensing portion is located radially around the magnetic rotor. The electric valve also includes a magnet, which is located between the stator housing and the main body portion of the position sensor along the extension direction of the rotor rotation axis.

[0006] The electric valve includes a stator assembly and a rotor assembly. The stator assembly includes a stator housing. The electric valve also includes a position sensor and a magnet. Along the extension direction of the rotor rotating shaft, the magnet is located between the stator housing and the position sensor. In this way, according to the principle of shortest magnetic circuit, the leakage magnetic field of the stator assembly enters the magnet, the leakage magnetic field of the stator assembly at the sensing part is weakened, and the interference of the leakage magnetic field of the stator assembly on the position sensor is reduced, which is conducive to improving the reliability of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 11 is a schematic cross-sectional view of a first embodiment of an electric valve;

[0008] Figure 2 yes Figure 1 Schematic diagram of the local enlarged structure at A in the middle;

[0009] Figure 3 yes Figure 1 A schematic diagram of the three-dimensional structure of the position sensor;

[0010] Figure 4 yes Figure 1 A schematic diagram of the front view of the intermediate conductor magnet;

[0011] Figure 5 yes Figure 1 A schematic diagram of the three-dimensional structure of the middle fixing frame;

[0012] Figure 6 It is a three-dimensional structural diagram of the combination of the fixing frame and the position sensor;

[0013] Figure 7 It is a structural schematic diagram of a first embodiment of the combined structure of a magnetic conductor, a fixing bracket and a position sensor;

[0014] Figure 8 It is a cross-sectional structural diagram of the combined structure of the fixing frame, the position sensor and the magnetic conductor;

[0015] Figure 9 yes Figure 7 A schematic diagram of the three-dimensional structure of the intermediate conductor magnet;

[0016] Figure 10 yes Figure 9 A schematic cross-sectional structure diagram of a magnetic conductor;

[0017] Figure 11 1 is a schematic structural diagram of a second embodiment of the combined structure of a magnetic conductor, a fixing bracket and a position sensor;

[0018] Figure 12 yes Figure 11 A schematic cross-sectional view of the combined structure of the central fixing frame, position sensor, and magnetic conductor;

[0019] Figure 13 yes Figure 11 A schematic diagram of a three-dimensional structure of the first fixing frame and the magnetic conductor;

[0020] Figure 14 yes Figure 13 A schematic cross-sectional view of the combined structure of the first fixing frame and the magnetic conductor;

[0021] Figure 15 yes Figure 11A schematic diagram of a three-dimensional structure of the second fixing frame;

[0022] Figure 16 1 is a schematic cross-sectional view of a second embodiment of an electric valve;

[0023] Figure 17 yes Figure 16 Schematic diagram of the local enlarged structure at B in the middle;

[0024] Figure 18 yes Figure 16 A schematic structural diagram of the combination of the upper and middle shells and the magnetic conductor from one perspective;

[0025] Figure 19 yes Figure 18 A cross-sectional structural diagram of ;

[0026] Figure 20 It is a partial schematic diagram of an embodiment of the upper housing of the electric valve;

[0027] Figure 21 It is a partial schematic diagram of an implementation method of a magnetic conductor of an electric valve. DETAILED DESCRIPTION

[0028] The technical features and advantages of the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] Combine Figure 1-Figure 3 In one embodiment of an electric valve 100, the electric valve 100 includes a stator assembly 1 and a rotor assembly 2. The stator assembly 1 is located outside the rotor assembly 2 and is a claw-pole stator assembly. The stator assembly 1 includes a stator housing 11, a coil 12, and a skeleton 13. The skeleton 13 provides support for the coil 12. The stator housing 11 is located outside the coil 12. The rotor assembly 2 includes a magnetic rotor 21, which rotates about a rotor rotation axis L. The electric valve also includes a position sensor 3. In this embodiment, the position sensor 3 is a Hall sensor. When the magnetic pole of the magnetic rotor 21 changes, the output signal of the position sensor changes. The position sensor 3 includes a main body 31 and a connecting portion 32. The main body 31 has a sensing portion 311 located radially outside the magnetic rotor 21. The electric valve also includes a magnetizer 4 located between the stator housing 11 and the main body 31 of the position sensor along the extension direction of the rotor axis L. This allows the stator assembly's magnetic flux to enter the magnetizer, reducing the stator assembly's magnetic flux leakage at the sensing portion 311. This reduces interference with the stator assembly's magnetic flux leakage, thereby improving detection reliability. Figure 1In this embodiment, the electric valve 100 further includes a valve body 101, a valve core 102, a valve seat assembly 103, a sleeve 104, and an electronic control board 105. In this embodiment, the valve core 102 is needle-shaped. A portion of the sleeve 104 is located between the stator assembly 1 and the rotor assembly 2. The stator assembly 1 is electrically and / or signal-connected to the electronic control board 105. The valve seat assembly 103 has a valve port 1031. During operation, the electric valve controls the current flowing through the coil 12 to vary according to a predetermined pattern, thereby controlling the stator assembly 1 to generate a varying excitation magnetic field. The rotor assembly 2 rotates under the influence of the excitation magnetic field and rotates about the rotor rotation axis L. The rotor assembly 2 drives the valve core 102 to move relative to the valve port 1031, thereby adjusting the opening of the valve port 1031. Of course, in other embodiments, the valve port 1031 may be formed in the valve body 101. In other embodiments, the electric valve may also be an electric ball valve with a spherical valve core.

[0030] Combine Figures 1-4The electric valve further includes an injection molding portion 5 having a cavity 51. An electronic control board 105 is located within the cavity 51 and includes a control unit. The injection molding portion 5 also includes a housing 52 located radially around the magnetic rotor 21. The magnetizer 4 is located within the housing 52. At least a portion of the position sensor's main body 31 is located within the housing 52. Along the extension direction of the rotor's rotation axis L, the magnetizer 4 is located below the main body 31 of the position sensor 3. The position sensor 3 is electrically and / or signal-connected to the electronic control board 105 via the connector 32. In the absence of a magnetizer 4, when the stator assembly magnetic flux leakage is greater than or equal to the operating value of the position sensor 3 and the magnetic rotor 21 has a large number of magnetic poles, the magnetic field generated by the magnetic rotor 21 is relatively weak at the sensing portion 311 of the position sensor 3. Alternatively, when the stator assembly magnetic flux leakage is close to the operating value of the position sensor 3, the position sensor 3 may generate a signal due to the stator assembly magnetic flux leakage, thereby causing a misjudgment. This solution, by adding a magnetizer 4 between the stator housing 11 and the position sensor 3, can weaken the magnetic field of the stator assembly magnetic flux leakage at the sensing portion 311 of the position sensor 3, reduce the interference of the stator assembly magnetic flux leakage on the position sensor 3, and help improve the reliability of detection. The magnetizer 4 is composed of materials including magnetic conductive materials, and the magnetizer 4 includes silicon steel sheets and magnetic conductive steel. In one embodiment, the magnetizer 4 is square, and the surface area of ​​a single side of the magnetizer 4 is greater than the cross-sectional area of ​​the main body 31. The magnetizer 4 is located in the accommodating portion 52, and the magnetizer 4 is located between the bottom of the accommodating portion and the position sensor 3. The position sensor 3 abuts against the magnetizer 4, confining the magnetizer 4 in the accommodating portion 52. In other embodiments, the magnetizer 4 may also be arc-shaped or have other shapes. In other embodiments, if it can meet the requirements, the surface area of ​​a single side of the magnetizer 4 may also be less than or equal to the cross-sectional area of ​​the main body 31. In other embodiments, the accommodating portion 52, the position sensor 3, and the magnetizer 4 may be disposed below the stator housing 11, with the magnetizer 4 located between the main body 31 of the position sensor 3 and the stator housing 11 along the extension direction of the rotor rotation axis L.

[0031] The magnetic rotor 21 includes at least one pair of magnetic poles, each pair of magnetic poles includes an N pole and an S pole, and the N pole and the S pole are spaced apart along the circumferential direction of the rotor assembly. The position sensor 3 senses the changes in the magnetic poles on the magnetic rotor 21 and generates a feedback signal. The control unit on the electronic control board 105 collects the feedback signal, and judges the operating status of the electric valve based on the feedback signal, and takes corresponding countermeasures. The operating status of the electric valve includes normal operation, stalling and loss of step.

[0032] Combine Figures 1-6The electric valve also includes a fixing bracket 6. The position sensor 3 is assembled with the fixing bracket 6. After the fixing bracket 6 and the position sensor 3 are assembled, they are installed in the accommodating portion 52, which is beneficial to improving the vibration resistance and stability of the position sensor. The fixing bracket 6 includes a fixing bracket body 61, a mounting groove 62, a through hole 63, and a limiting portion 64. The inner wall of the fixing bracket surrounds the mounting groove 62. The main body 31 of the position sensor 3 is accommodated in the mounting groove 62. The main body 31 cooperates with the inner wall of the fixing bracket to limit the position. The magnetizer 4 is located between the fixing bracket 6 and the bottom of the accommodating portion. The magnetizer 4 abuts against the fixing bracket 6 to limit the position, thereby limiting the magnetizer 4 in the accommodating portion 52. The connecting portion 32 passes through the through hole 63 and is fixed to the electric control board 105 by welding. In this embodiment, the connecting portion 32 of the position sensor 3 is a pin. The limiting portion 64 is located at the top of the fixing frame 6. The electric control board 105 is provided with a through hole that cooperates with the limiting portion 64. The limiting portion 64 passes through the through hole of the electric control board 105 and limits the position. The limiting portion 64 limits the position of the position sensor 3 relative to the electric control board 105. The limiting portion 64 can be a columnar structure or a snap-fit ​​structure.

[0033] Combine Figure 7-10In the first embodiment of the combined structure of a magnetizer, a fixing frame, and a position sensor, in this embodiment, the magnetizer 4a is fixedly connected to the fixing frame 6a. The fixing frame 6a includes a fixing frame body 61a, a mounting groove 62a, and a connecting post 65a. The connecting post 65a is located at the bottom of the fixing frame body 61a. The magnetizer 4a has a connecting hole 41a. The connecting post 65a passes through the connecting hole 41a. The fixing frame 6a and the magnetizer 4a are fixedly connected by melting the connecting post 65a at one end away from the fixing frame body 61a. In this embodiment, the number of connecting posts 65a is two, and the number of connecting holes 41a is two. The magnetizer 4a includes a first surface 42a and a second surface 43a. The first surface 42a is close to the bottom of the fixing frame 6a. The diameter of the connecting hole 41a of the magnetizer 4a gradually increases from the first surface 42a to the second surface 43a. In this way, the melting connecting post 65a forms a limit in the connecting hole, which can improve the reliability of the connection. The inner wall of the fixing frame surrounds the mounting groove 62a, and the main body 31a of the position sensor 3a is accommodated in the mounting groove 62a. The main body 31a cooperates with the inner wall of the fixing frame to limit the position. The position sensor 3a, the fixing frame 6a, and the magnetic conductor 4a are combined into one body and then installed in the accommodating portion 52 of the injection molding part 5, which is conducive to improving the vibration resistance. The fixing frame 6a also includes a through hole 63a and a limiting portion 64a. The connecting portion 32a of the position sensor 3a passes through the through hole 63a. The connecting portion 32a is fixed to the electric control board 105 by welding. The limiting portion 64a is located at the top of the fixing frame 6a. The electric control board 105 is provided with a through hole that cooperates with the limiting portion 64a. The limiting portion 64a passes through the through hole of the electric control board 105 and limits the position. The limiting portion 64a defines the position of the position sensor 3a relative to the electric control board 105. The limiting portion 64a can be a columnar structure or a snap-fit ​​structure. In this embodiment, the limiting portion 64a is a snap-fit ​​structure with a certain degree of deformation. The electronic control board 105 has a through hole corresponding to the snap-fit ​​structure. The fixing frame 6a is connected to the electronic control board 105 through the snap-fit ​​structure, which is conducive to improving the reliability of the connection.

[0034] Combine Figure 11-Figure 15In the second embodiment of the combined structure of a magnetizer, a fixing frame, and a position sensor, the fixing frame 6b is a split structure, comprising a first fixing frame 65b and a second fixing frame 66b. The magnetizer 4b is fixed to the first fixing frame 65b by injection molding, and the magnetizer 4b is fixed to the bottom of the first fixing frame 65b. The first fixing frame 6b is formed with a connecting column 653b, and the magnetizer 4b is formed with a connecting hole 41b, which helps improve the reliability of the connection. The first fixing frame 65b also has a columnar portion 651b, which is located at the top of the first fixing frame 65b. The second fixing frame 66b has a groove 661b that mates with the columnar portion 651b. The columnar portion 651b is tightly fitted and pressed into the groove 661b, thereby fixedly connecting the first fixing frame 65b and the second fixing frame 66b. The first fixing frame 65b has a first mounting slot 652b, and the second fixing frame 66b has a second mounting slot 662b. The position sensor 3b is accommodated in the first mounting slot 652b and the second mounting slot 662b. The position sensor 3a, the fixing frame 6b, and the magnetic conductor 4b are integrated into one body and then installed in the accommodating portion 52 of the injection molding part 5, which is conducive to improving the vibration resistance. The second fixing frame 66b also includes a through hole 663b and a limiting portion 664b. The connecting portion 32b passes through the through hole 663b. The connecting portion 32b is fixed to the electronic control board 105 by welding. The limiting portion 664b is located at the top of the second fixing frame 66b. The electronic control board 105 is provided with a through hole that cooperates with the limiting portion 664b. The limiting portion 664b passes through the through hole of the electronic control board 105 and limits the position. The limiting portion 664b determines the position of the position sensor 3b relative to the electronic control board 105. The limiting portion 664b can be a columnar structure or a snap-fit ​​structure. In this embodiment, the limiting portion 664b is a snap-fit ​​structure with a certain degree of deformation. The electronic control board 105 has a through hole corresponding to the snap-fit ​​structure. The fixing frame 6b is connected to the electronic control board 105 via the snap-fit, which is beneficial to improving the reliability of the connection.

[0035] Combine Figure 16-19In this embodiment, the magnetizer 4c is fixed to the stator housing 11c by welding. The stator housing 11c includes a first stator housing 111c and a second stator housing 112c. The magnetizer 4c is fixedly connected to the first stator housing 111c. In this embodiment, the first stator housing 111c includes an upper shell 113c and a lower shell 114c. The upper shell 113c includes a top plate 1131c, side plates 1132c, and a plurality of claw poles 1133c. The side plates 1132c are located on the outer periphery of the coil 12, the claw poles 1133c are located on the inner periphery of the coil 12, and the top plate 1131c is located at the upper end of the coil. The magnetizer 4c is fixed to the upper end of the top plate 1131c by welding. Along the extension direction of the rotor rotation axis L, the magnetizer 4c is located below the main body 31c of the position sensor 3c. In this embodiment, the magnetizer 4c is arc-shaped and is relatively close to the connection between the claw poles 1133c and the top plate 1131c. In other embodiments, the magnetic conductor 4c may be welded and fixed below the second stator housing 112c, and the position sensor 3c may be located below the magnetic conductor 4c.

[0036] Combine Figure 20 、 Figure 21 In this embodiment, the magnetizer 4d is fixed to the stator housing 11d by riveting. A small hole 1132d is stamped into the top plate 1131d of the stator housing 11d, and a protrusion 41d is formed on the magnetizer 4d. The protrusion 41d of the magnetizer 4d and the small hole 1132d of the top plate 1131d are riveted together, thereby securing the magnetizer 4d. The magnetizers may also be connected by other means.

[0037] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although this specification has described the present invention in detail with reference to the above embodiments, ordinary technicians in this field should understand that technicians in the relevant technical field can still modify or replace the present invention with equivalents, and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered by the scope of the claims of the present invention.

Claims

1. An electric valve, comprising a stator assembly and a rotor assembly, wherein the stator assembly is located at the periphery of the rotor assembly, the stator assembly is a claw-pole stator assembly, the stator assembly comprises a stator housing, a coil, and a skeleton, the skeleton providing support for the coil, the stator housing being located at the periphery of the coil, the rotor assembly comprising a magnetic rotor, the magnetic rotor rotating around a rotor axis, the electric valve further comprising a position sensor, the position sensor comprising a body having a sensing portion, the sensing portion being located radially around the magnetic rotor, and characterized in that: The electric valve further includes a magnetizer, which is made of a material including a magnetic conductive material. Along the extension direction of the rotor rotating shaft, the magnetizer is located below the main body and between the stator housing and the main body of the position sensor.

2. The electric valve according to claim 1, characterized in that The stator housing includes a first stator housing, the first stator housing includes an upper shell, the upper shell includes a top plate, and the magnetizer is fixed to the top plate by welding or riveting along the extension direction of the rotor rotation axis.

3. The electric valve according to claim 1, characterized in that The electric valve also includes an injection molding part and an electric control board. The injection molding part has a cavity, and the electric control board is located in the cavity. The injection molding part has a accommodating part, and the accommodating part is located on the radial periphery of the magnetic rotor. The magnet is located in the accommodating part, and at least part of the main body is located in the accommodating part. Along the extension direction of the rotor rotating shaft, the position sensor includes a connecting part, and the position sensor is electrically and / or signal-connected with the electric control board through the connecting part.

4. The electric valve according to claim 3, characterized in that The electric valve also includes a fixing bracket, which has a mounting groove. The inner wall of the fixing bracket surrounds the mounting groove. The main body of the position sensor is accommodated in the mounting groove. The main body cooperates with the inner wall of the fixing bracket to limit the position. The magnet is located between the fixing bracket and the bottom of the accommodating portion. The magnet abuts against the fixing bracket to limit the magnet in the accommodating portion.

5. The electric valve according to claim 1 or 3, characterized in that: The electric valve also includes a fixing frame, which includes a fixing frame body and a connecting column. The connecting column is located at the bottom of the fixing frame body. The magnetic conductor has a connecting hole. The connecting column passes through the connecting hole. The fixing frame is fixedly connected to the magnetic conductor by melting one end of the connecting column away from the fixing frame body. The fixing frame also has a mounting groove. The inner wall of the fixing frame surrounds the mounting groove. The main body of the position sensor is accommodated in the mounting groove. The main body cooperates with the inner wall of the fixing frame to limit the position.

6. The electric valve according to claim 1 or 3, characterized in that: The electric valve also includes a fixing frame, which is a split structure. The fixing frame includes a first fixing frame and a second fixing frame. The magnetic conductor is fixed to the first fixing frame by injection molding, and the magnetic conductor is located at the bottom of the first fixing frame; the first fixing frame also has a columnar portion, which is located at the top of the first fixing frame, and the second fixing frame has a groove that cooperates with the columnar portion. The columnar portion is tightly fitted and pressed into the groove, thereby fixedly connecting the first fixing frame and the second fixing frame; the first fixing frame has a first mounting groove, and the second fixing frame has a second mounting groove. The position sensor is accommodated in the first mounting groove and the second mounting groove.

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