Electronic expansion valve, refrigeration equipment and automobile

Abstract

The invention discloses an electronic expansion valve, refrigeration equipment and an automobile, the electronic expansion valve comprises a valve sleeve and a valve body, and a Hall sensor is installed in the valve sleeve; the valve body comprises a shell, a magnetic rotor, a valve rod and a Hall ring, the shell is arranged in the valve sleeve in a penetrating mode, and the shell is provided with a mounting cavity; the magnetic rotor is rotatably mounted in the mounting cavity, the valve rod is mounted in the mounting cavity and connected with the magnetic rotor, and the magnetic rotor can drive the valve rod to rotate; wherein the Hall ring is installed on the cavity wall of the installation cavity and connected with the valve rod, and the valve rod can drive the Hall ring to rotate so that the Hall sensor can detect a magnetic induction signal of the Hall ring. According to the technical scheme, the signal sensing stability of the Hall sensor is improved.

Description

Technical Field

[0001] The invention relates to the technical field of control valves, and in particular to an electronic expansion valve, a refrigeration device and a car. Background Art

[0002] In the related art, the rotor assembly of the electronic expansion valve moves up and down while rotating, thereby opening and closing the valve port of the electronic expansion valve to achieve the function of flow regulation. In order to determine whether the electronic expansion valve is stuck or blocked, the rotor usually provides a Hall signal, the Hall sensor senses the signal, and compares it with the pulse signal sent by the host to make a judgment. However, due to the up and down movement of the rotor, the signal received by the Hall sensor changes, thereby affecting the stability of the sensing. Summary of the invention

[0003] The main purpose of the present invention is to provide an electronic expansion valve, a refrigeration device and a car, aiming to improve the stability of the sensing signal of the Hall sensor.

[0004] To achieve the above-mentioned purpose, the electronic expansion valve proposed in the present invention includes a valve sleeve and a valve body, wherein a Hall sensor is installed in the valve sleeve; the valve body includes a shell, a magnetic rotor, a valve stem and a Hall ring, wherein the shell is inserted into the valve sleeve, and the shell is provided with an installation cavity; the magnetic rotor is rotatably installed in the installation cavity, the valve stem is installed in the installation cavity and connected to the magnetic rotor, and the magnetic rotor can drive the valve stem to rotate; wherein the Hall ring is installed on the cavity wall of the installation cavity and connected to the valve stem, and the valve stem can drive the Hall ring to rotate, so that the Hall sensor detects the magnetic induction signal of the Hall ring.

[0005] In one embodiment, a mounting seat is provided on the cavity wall of the mounting cavity, and the Hall ring is rotatably mounted on the mounting seat.

[0006] In one embodiment, the mounting seat is arranged on a peripheral wall of the Hall ring.

[0007] In one embodiment, a peripheral wall of the Hall ring is provided with a groove for the mounting seat to extend into.

[0008] In one embodiment, the mounting seat is arranged in a ring shape.

[0009] In one embodiment, a surface of the mounting seat facing the bottom of the groove is a curved surface.

[0010] In one embodiment, the Hall ring is located at one end of the valve stem.

[0011] In one embodiment, the valve stem has a first circumferential wall surface and a second circumferential wall surface extending along the axis thereof, and the first circumferential wall surface and the second circumferential wall surface intersect and are arranged at an angle.

[0012] In one embodiment, a cavity wall of the installation cavity is provided with a positioning protrusion, and the positioning protrusion is used to fix the installation seat.

[0013] In one embodiment, the Hall sensor is located outside the valve body and is arranged opposite to the Hall ring.

[0014] In one embodiment, the number of magnetic poles of the Hall ring is an even multiple of the number of magnetic rotors.

[0015] In one embodiment, the number of magnetic poles of the Hall ring is twice or four times that of the magnetic rotor.

[0016] The present invention also proposes a refrigeration device, which includes an electronic expansion valve, which includes a valve sleeve and a valve body, and a Hall sensor is installed in the valve sleeve; the valve body includes a shell, a magnetic rotor, a valve stem and a Hall ring, and the shell is inserted into the valve sleeve, and the shell is provided with an installation cavity; the magnetic rotor is rotatably installed in the installation cavity, the valve stem is installed in the installation cavity and is connected to the magnetic rotor, and the magnetic rotor can drive the valve stem to rotate; wherein the Hall ring is installed on the cavity wall of the installation cavity and is connected to the valve stem, and the valve stem can drive the Hall ring to rotate, so that the Hall sensor detects the magnetic induction signal of the Hall ring.

[0017] The present invention also proposes a car, which includes a refrigeration device, which includes an electronic expansion valve, the electronic expansion valve includes a valve sleeve and a valve body, and a Hall sensor is installed in the valve sleeve; the valve body includes a shell, a magnetic rotor, a valve stem and a Hall ring, the shell is penetrated by the valve sleeve, and the shell is provided with an installation cavity; the magnetic rotor is rotatably installed in the installation cavity, the valve stem is installed in the installation cavity and is connected to the magnetic rotor, and the magnetic rotor can drive the valve stem to rotate; wherein the Hall ring is installed on the cavity wall of the installation cavity and is connected to the valve stem, and the valve stem can drive the Hall ring to rotate, so that the Hall sensor detects the magnetic induction signal of the Hall ring.

[0018] The technical solution of the present invention drives the Hall ring to rotate through the rotation of the valve stem. Since the Hall ring is installed on the wall of the installation cavity of the shell, the Hall ring is limited so that the magnetic rotor can rotate relative to the shell and move in the axial direction of the valve stem, while the Hall ring will not move in the axial direction of the valve stem as the valve stem rotates, thereby avoiding the change in the strength of the signal caused by the change in displacement of the Hall ring, and finally improving the stability of the Hall sensor signal reception and the sensitivity of the induction. The Hall sensor in the valve sleeve collects the magnetic field of the Hall ring during the movement process to form a motion magnetic field curve, thereby judging the operation of the magnetic rotor, such as the rotating state or the stuck state, and whether the rotating state is rising or falling, and can timely find out whether the magnetic rotor is working normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 A cross-sectional schematic diagram of an embodiment of an electronic expansion valve of the present invention;

[0021] Figure 2 It is a cross-sectional schematic diagram of an embodiment of a valve body of the present invention;

[0022] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0023] Figure 4 A cross-sectional schematic diagram of an embodiment of a Hall ring of the present invention;

[0024] Figure 5 for Figure 4 Another view of the Hall ring;

[0025] Figure 6 A cross-sectional schematic diagram of an embodiment of a mounting base of the present invention;

[0026] Figure 7 for Figure 6 Another perspective view of the middle mount;

[0027] Figure 8 It is a structural schematic diagram of an embodiment of a valve stem of the present invention;

[0028] Fig. 9 for Figure 8 Another perspective view of the middle valve stem;

[0029] Fig.10 A schematic diagram of the magnetic pole structure of an embodiment of a magnetic rotor of the present invention;

[0030] Fig.11 Schematic diagram of the magnetic pole structure of a Hall ring embodiment of the present invention.

[0031] Description of Figure Numbers:

[0032]

[0033]

[0034] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] The invention provides an electronic expansion valve.

[0039] In the embodiment of the present invention, please refer to Figure 1 to Figure 2 The electronic expansion valve 1 comprises a valve sleeve 10 and a valve body 20, wherein a Hall sensor 11 is installed in the valve sleeve 10; the valve body 20 comprises a shell 100, a magnetic rotor 200, a valve stem 300 and a Hall ring 400, wherein the shell 100 is inserted through the valve sleeve 10, and the shell 100 is provided with an installation cavity 100a; the magnetic rotor 200 is rotatably installed in the installation cavity 100a, the valve stem 300 is installed in the installation cavity 100a and connected to the magnetic rotor 200, and the magnetic rotor 200 can drive the valve stem 300 to rotate. Figure 2 The Hall ring 400 is installed on the cavity wall of the installation cavity 100a and connected to the valve stem 300 . The valve stem 300 can drive the Hall ring 400 to rotate so that the Hall sensor 11 detects the magnetic induction signal of the Hall ring 400 .

[0040] For details, please refer to Figure 1 The valve sleeve 10 may be provided with a receiving cavity 10a, and the Hall sensor 11 is installed in the receiving cavity 10a. The valve sleeve 10 may be sleeved on the valve body 20, so that the Hall sensor 11 can detect the magnetic induction signal of the Hall ring 400. The valve sleeve 10 may be an annular structure with openings at both ends. When it is matched with the valve body 20, the valve sleeve 10 is arranged around the outer periphery of the valve body 20; or the valve sleeve 10 may be provided with a receiving groove with an opening at one end, and the valve body 20 extends into the receiving groove. The Hall sensor 11 in the receiving cavity 10a is used to receive the magnetic induction signal of the Hall ring 400 in the valve body 20. Please continue to refer to Figure 1 A PCB board 12 may also be installed in the accommodating cavity 10 a , and the Hall sensor 11 may be installed on the PCB board 12 , so that the Hall sensor 11 may transmit signals to the PCB board 12 .

[0041] Please refer to Figure 1 to Figure 2 The housing 100 of the valve body 20 is provided with an installation cavity 100a, and the magnetic rotor 200, the valve stem 300 and the Hall ring 400 are all installed in the housing 100, so as to protect the magnetic rotor 200, the valve stem 300 and the Hall ring 400. The housing 100 can be a cylindrical structure with one end open to cover the magnetic rotor 200, the valve stem 300 and the Hall ring 400, that is, to isolate and protect the magnetic rotor 200, the valve stem 300 and the Hall ring 400 and reduce the possibility of damage, which is conducive to extending the service life of the components in the installation cavity 100a. Please refer to Figure 2 The magnetic rotor 200 is rotatably mounted in the mounting cavity 100a, and at least a portion of the magnetic rotor 200 can be sleeved on the outer periphery of the valve stem 300. The rotation of the magnetic rotor 200 drives the valve stem 300 to rotate, so that the valve needle 330 connected to the valve stem 300 can rise and fall, so that the valve needle 330 can be inserted into the valve port 100b of the valve body 20, or detached from the valve port 100b, thereby adjusting the flow rate of the refrigerant of the electronic expansion valve 1.

[0042] Please refer to Figure 2 The valve body 20 may further include a nut 600 installed in the installation cavity 100a, the nut 600 is sleeved on the valve stem 300 and is screwed with the valve stem 300. The magnetic rotor 200 may be a permanent magnet, used to provide power so that the valve stem 300 can rotate relative to the nut 600. The valve stem 300 and the magnetic rotor 200 can rotate synchronously, and through the threaded cooperation of the valve stem 300 and the nut 600, the valve needle 330 connected to the valve stem 300 can move up and down along the approach to or away from the valve port 100b, thereby realizing the insertion and disengagement of the valve port 100b. Among them, the magnetic rotor 200 may be a cylindrical structure with one end open, so that its shape is adapted to the rotation trajectory and the possibility of interference during the movement can be reduced.

[0043] Please refer to Figure 1 to Figure 2 The electronic expansion valve 1 may further include a stator 13 installed in the valve sleeve 10. The stator 13 may include a coil support and a coil. The coil is arranged on the coil support, and the coil support provides support for the coil. When the valve body 20 is inserted into the valve sleeve 10, the stator 13 is located at the outer periphery of the magnetic rotor 200. After a certain regular current is passed through the coil, a driving magnetic field is formed. The driving magnetic field interacts with the magnetic field of the magnetic rotor 200, thereby driving the magnetic rotor 200 to rotate, and then driving the valve stem 300 to rotate. It can be understood that the magnetic rotor 200 rotates under the action of the stator 13, thereby driving the valve stem 300 to rotate in a first direction, wherein the first direction can be one of clockwise and counterclockwise; the magnetic rotor 200 can also drive the valve stem 300 to rotate the valve stem 300 in a second direction opposite to the first direction, so that a gap is formed between the tapered section of the valve needle 330 and the valve port 100b.

[0044] Please refer to Figure 2 , the Hall ring 400 may be a permanent magnet having multiple magnetic poles to provide magnetic pole signals. It is understood that, please refer to Fig.11 The multiple magnetic poles of the Hall ring 400 extend axially, and the N poles and S poles are arranged alternately. The structure of the Hall ring 400 can be set as a ring, with an opening, or a closed loop. Figure 2 , the magnetic rotor 200 can drive the valve stem 300 to move up and down while rotating. Since the Hall ring 400 is installed on the wall of the installation cavity 100a, the installation cavity 100a limits the axial movement of the Hall ring 400, and the valve stem 300 is inserted into the Hall ring 400. Driven by the valve stem 300, the Hall ring 400 rotates, thereby generating a magnetic field change at the edge of the Hall ring 400. The Hall sensor 11 in the valve sleeve 10 can sense the magnetic field change, convert the change signal into an electrical signal, and then monitor the rotation of the magnetic rotor 200 according to the electrical signal, or provide control information according to the electrical signal to control the rotation speed of the magnetic rotor 200, control the opening of the valve port 100b, and control the flow of the refrigerant.

[0045] It should be noted that the magnetic rotor 200 and the Hall ring 400 are separately arranged, and the Hall ring 400 is installed on the wall of the installation cavity 100a of the housing 100. When the magnetic rotor 200 rotates and moves up and down, the Hall ring 400 can rotate, but there will be no displacement change in the up and down direction. Therefore, the Hall ring 400 will not move up and down with the magnetic rotor 200, and the setting of the number of magnetic poles of the Hall ring 400 is not limited to the magnetic rotor 200. The Hall ring 400 and the magnetic rotor 200 can be made of magnetic powder, PPS and adhesive.

[0046] The technical solution of the present invention drives the Hall ring 400 to rotate through the rotation of the valve stem 300. Since the Hall ring 400 is installed on the wall of the installation cavity 100a of the housing 100, the Hall ring 400 is limited, so that the magnetic rotor 200 can rotate relative to the housing 100 and move in the axial direction of the valve stem 300, while the Hall ring 400 will not move in the axial direction of the valve stem 300 with the rotation of the valve stem 300, thereby avoiding the Hall ring 400 from causing the signal strength to change due to the displacement change, and finally improving the stability of the signal reception of the Hall sensor 11 and the sensitivity of the induction. The Hall sensor 11 in the valve sleeve 10 collects the magnetic field of the Hall ring 400 during the movement process to form a motion magnetic field curve, thereby judging the operation of the magnetic rotor 200, such as the rotating state or the stuck state, and whether the rotating state is rising or falling, and can timely find out whether the magnetic rotor 200 is working normally.

[0047] The Hall ring 400 can be directly mounted on the wall of the mounting cavity 100a, or can be indirectly mounted on the wall of the mounting cavity 100a. Figures 2 to 3 In one embodiment, a mounting seat 500 is provided on the cavity wall of the mounting cavity 100 a , and the Hall ring 400 is rotatably mounted on the mounting seat 500 .

[0048] Please continue to refer to Figure 2 , the Hall ring 400 is supported by providing a mounting seat 500, and the Hall ring 400 can rotate on the mounting seat 500, so that the housing 100 can be assembled with the Hall ring 400 after being formed, thereby simplifying the processing technology of the housing 100. The mounting seat 500 can be a protruding structure to support the Hall ring 400; or it can be a recessed structure, and the Hall ring 400 is provided with a connecting piece corresponding to the recessed structure. There are many ways to use the mounting seat 500. In one embodiment, the material of the mounting seat 500 is one or more of stainless steel, aluminum or copper.

[0049] Please refer to Figure 2 , Figure 4 and Figure 6 In one embodiment, the mounting seat 500 is sleeved on the peripheral wall of the Hall ring 400. The mounting seat 500 is connected to the peripheral wall of the Hall ring 400, which not only does not affect the rotation of the Hall ring 400, but also improves the limiting support of the Hall ring 400 to prevent the Hall ring 400 from falling, and further improves the reliability and stability of the magnetic field signal detection.

[0050] The protrusion 510 may extend into the Hall ring 400, or the protrusion 510 may be located below the Hall ring 400, or located above and below the Hall ring 400, so as to support or limit the Hall ring 400. Figures 2 to 4In one embodiment, the peripheral wall of the Hall ring 400 is provided with a groove 400a for the mounting seat 500 to extend into. The mounting seat 500 is provided with a protrusion 510, which can be a convex block, a convex strip or a convex ring. The convex block, convex strip or convex ring can be formed by the cavity wall of the mounting cavity 100a protruding outward. By extending the protrusion 510 into the groove 400a of the Hall ring 400, the housing 100 axially limits the Hall ring 400, so that the Hall ring 400 rotates on the cavity wall of the mounting cavity 100a without moving up and down.

[0051] The protrusions 510 may be arranged at intervals along the rotation direction of the Hall ring 400, or may extend along the rotation direction of the Hall ring 400. Figure 2 and Figure 7 In one embodiment, the mounting seat 500 is annular. The protrusion 510 is annularly arranged on the wall of the mounting cavity 100a, and the groove 400a of the Hall ring 400 extends along its circumference accordingly, further improving the stability of the connection between the Hall ring 400 and the mounting seat 500, and preventing the Hall ring 400 from falling off the mounting seat 500 when rotating. Please refer to Figure 6 to Figure 7 In one embodiment, the annular mounting seat 500 may include a first mounting portion 521 and a second mounting portion 522, which are enclosed to form an annular structure. The first mounting portion 521 and the second mounting portion 522 are both provided with a protrusion 510, and the first mounting portion 521 and the second mounting portion 522 can be integrally arranged with the protrusion 510.

[0052] Please continue to refer to Figure 6 to Figure 7 In one embodiment, the side of the mounting seat 500 facing the bottom of the groove 400a is an arc surface. Figures 3 to 5 The groove 400a has a groove opening and a groove bottom facing the groove opening, and the protrusion 510 extends into the groove 400a from the groove opening. The side of the protrusion 510 facing the groove bottom is set as an arc surface to reduce the possibility of interference of the Hall ring 400 during movement.

[0053] The position of the Hall ring 400 on the valve stem 300 can be varied. Figure 2 In one embodiment, the Hall ring 400 is located at one end of the valve stem 300. Figure 2 One end of the valve stem 300 can be connected to the valve needle 330 , and the other end can be connected to the Hall ring 400 . The Hall ring 400 is located above the magnetic rotor 200 , thereby avoiding interference between the magnetic rotor 200 and the Hall ring 400 .

[0054] The mounting seat 500 can be formed by protruding the wall of the mounting cavity 100a, or can be installed on the wall of the mounting cavity 100a. There are many ways to install the mounting seat 500 on the wall of the mounting cavity 100a, which can be adhesive or clamping. Figures 2 to 3 In one embodiment, the cavity wall of the mounting cavity 100a is provided with a positioning protrusion 110, and the positioning protrusion 110 is used to fix the mounting seat 500. It can be understood that the positioning protrusion 110 can be a convex block, a convex strip or a convex bubble, etc. The positioning protrusion 110 and the mounting seat 500 can be interference fit, and the positioning protrusion 110 is squeezed and deformed to support and fix the mounting seat 500.

[0055] In order to make the valve stem 300 drive the Hall ring 400 to rotate, please refer to Figures 8 to 9 In one embodiment, the valve stem 300 has a first circumferential wall surface 311 and a second circumferential wall surface 312 extending along its axis, and the first circumferential wall surface 311 and the second circumferential wall surface 312 intersect and are arranged at an angle.

[0056] Please refer to Figure 2 , Figure 5 and Fig. 9 The valve stem 300 includes a first section 310 and a second section 320. The first section 310 is connected to the second section 320. The first section 310 is inserted into the Hall ring 400, and the second section 320 is inserted into the magnetic rotor 200. The first section 310 has a first circumferential wall surface 311 and a second circumferential wall surface 312 extending along its axis. The Hall ring 400 is provided with a connecting hole 400b for the first section 310 to pass through by setting the angle between the first circumferential wall surface 311 and the second circumferential wall surface 312, so that the Hall ring 400 can be driven to rotate when the valve stem 300 rotates. It can be understood that the first section 310 can be set in a prismatic shape, please refer to Figures 8 to 9 In one embodiment, the first segment 310 is a quadrangular prism. Figures 4 to 5 , the connecting hole 400b is a square hole.

[0057] Please refer to Figure 1 In one embodiment, the Hall sensor 11 is located outside the valve body 20 and is arranged opposite to the Hall ring 400, so that the Hall sensor 11 does not interfere with the rotation of the Hall ring 400. At the same time, the Hall ring 400 is within the detection range of the Hall sensor 11, which ensures the reliability of the signal received by the Hall sensor 11. The number of the Hall sensors 11 can be multiple, and multiple Hall sensors 11 are located in the valve sleeve 10 and are all opposite to the Hall ring 400. By comparing the signals received by multiple Hall sensors 11, the accuracy of judging the rotation of the magnetic rotor 200 is further improved.

[0058] Since the existing rotor itself provides both a driving magnetic field and a Hall signal magnetic field when rotating, in order to have sufficient magnetic field driving force, the rotor is generally 20 poles or 24 poles, and it is impossible to further subdivide and increase the magnetic poles. In this way, only 20 poles or 24 poles are generated to generate Hall signals, which limits the number of magnetic poles of the rotor. Only one Hall signal can be received for every four pulse signals. However, the present application sets the magnetic rotor 200 and the Hall ring 400 separately, so that the number of magnetic poles of the magnetic rotor 200 and the Hall ring 400 can be magnetized separately, that is, the number of magnetic poles of the magnetic rotor 200 and the Hall ring 400 can be set differently.

[0059] Please refer to Figure 10 to Figure 11 In one embodiment, the number of magnetic poles of the Hall ring 400 is an integer multiple of the magnetic rotor 200, thereby improving the accuracy of the Hall sensor 11 signal and accurately determining the rotation angle of the magnetic rotor 200. Furthermore, in one embodiment, the number of magnetic poles of the Hall ring 400 is an even multiple of the magnetic rotor 200. Furthermore, in one embodiment, the number of magnetic poles of the Hall ring 400 is 2 times or 4 times the magnetic rotor 200, achieving more accurate Hall sensing judgment, thereby determining whether the magnetic rotor 200 is blocked, whether it is in the rising stage or the descending stage, and performing position feedback, thereby improving the reliability of the electronic expansion valve 1. Please refer to Figure 10 to Figure 11 The number of magnetic poles of the Hall ring 400 is 40, and the number of magnetic poles of the magnetic rotor 200 is 20. The number of magnetic poles of the Hall ring 400 is twice that of the magnetic rotor 200.

[0060] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. An electronic expansion valve, characterized in that: include: A valve sleeve, wherein a Hall sensor is installed in the valve sleeve; A valve body, the valve body comprising a shell, a magnetic rotor, a valve stem and a Hall ring, the shell being inserted through the valve sleeve, the shell being provided with an installation cavity; the magnetic rotor being rotatably installed in the installation cavity, the valve stem being installed in the installation cavity and connected to the magnetic rotor, the magnetic rotor being able to drive the valve stem to rotate; The Hall ring is installed on the cavity wall of the installation cavity and connected to the valve stem. The valve stem can drive the Hall ring to rotate so that the Hall sensor detects the magnetic induction signal of the Hall ring.

2. The electronic expansion valve according to claim 1, characterized in that: A mounting seat is provided on the cavity wall of the mounting cavity, and the Hall ring is rotatably mounted on the mounting seat.

3. The electronic expansion valve according to claim 2, characterized in that: The mounting seat is sleeved on the peripheral wall of the Hall ring.

4. The electronic expansion valve according to claim 3, characterized in that: The peripheral wall of the Hall ring is provided with a groove for the mounting seat to extend into.

5. The electronic expansion valve according to claim 4, characterized in that: The mounting seat is arranged in a ring shape.

6. The electronic expansion valve according to claim 5, characterized in that: A surface of the mounting seat facing the bottom of the groove is arranged as an arc surface.

7. The electronic expansion valve according to any one of claims 1 to 6, characterized in that: The Hall ring is located at one end of the valve stem.

8. The electronic expansion valve according to any one of claims 1 to 6, characterized in that: The valve stem has a first circumferential wall surface and a second circumferential wall surface extending along the axis thereof, wherein the first circumferential wall surface and the second circumferential wall surface intersect and are arranged at an angle.

9. The electronic expansion valve according to any one of claims 2 to 6, characterized in that: The cavity wall of the installation cavity is provided with a positioning protrusion, and the positioning protrusion is used to fix the installation seat.

10. The electronic expansion valve according to any one of claims 1 to 6, characterized in that: The Hall sensor is located outside the valve body and is arranged opposite to the Hall ring.

11. The electronic expansion valve according to any one of claims 1 to 6, characterized in that: The number of magnetic poles of the Hall ring is an even multiple of that of the magnetic rotor.

12. The electronic expansion valve according to claim 11, characterized in that: The number of magnetic poles of the Hall ring is twice or four times that of the magnetic rotor.

13. A refrigeration device, characterized in that: Comprising the electronic expansion valve as claimed in any one of claims 1 to 12.

14. A car, characterized in that: The invention comprises a vehicle body and a refrigeration device as claimed in claim 13, wherein the refrigeration device is installed on the vehicle body.

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