Electronic expansion valve and refrigeration system

Abstract

The present invention discloses an electronic expansion valve and refrigeration system, wherein a valve needle assembly is configured to include a valve needle, a base, a connecting sleeve, an elastic member, and a sealing member; the valve needle is slidably connected to the base via the elastic member; the base and the connecting sleeve are threadedly connected to form a combination, and the combination is also threadedly connected to the valve body assembly, and a sealing member is provided at the gap between the combination and the valve body assembly for sealing, thereby achieving a connection between the valve needle assembly and the valve body assembly. By adopting a threaded assembly form to replace the existing interference fit assembly form, assembly only requires screwing in, and the requirements for processing accuracy are lower; at the same time, a sealing member is provided to seal leakage caused by difficulties in threaded assembly, thereby achieving a better sealing effect than the original assembly form, thereby solving the problems of difficulty in processing and assembly between the valve needle part and the valve body of the existing electronic expansion valve.

Description

Technical Field

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

[0002] The electronic expansion valve adjusts the liquid supply to the evaporator according to a preset program. Because it operates electronically, it's called an electronic expansion valve. It meets the requirements of the development of refrigeration mechatronics and possesses superior characteristics unmatched by thermal expansion valves. It facilitates intelligent control of refrigeration systems and is a promising automatic, energy-saving component.

[0003] The basic principle is that the rotor rotates after being excited by a magnetic field. This rotation drives the valve body through a drive assembly to open and close. However, existing electronic expansion valves often have high processing requirements, leading to difficulties in processing and assembly. For example, in existing electronic expansion valves, the valve needle and valve body are installed using an interference fit, with the valve needle directly press-fitted onto the valve body. This assembly method undoubtedly places high demands on the processing and assembly precision of the valve needle and valve body, making processing and assembly difficult and costly. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an electronic expansion valve and a refrigeration system to solve the problems of difficulty in manufacturing and assembling the valve needle part and the valve body of the existing electronic expansion valve.

[0005] In order to solve the above problems, the technical solution of the present invention is:

[0006] An electronic expansion valve of the present invention comprises:

[0007] A valve body assembly, wherein a valve chamber is provided in the valve body assembly;

[0008] a valve needle assembly, the valve needle assembly being movably disposed in the valve chamber along a first direction and being used for blocking or opening the valve chamber;

[0009] An excitation part, the excitation part is provided on the valve body assembly and cooperates with the valve body assembly to form a transmission chamber;

[0010] a planetary assembly, the planetary assembly being rotatably connected to the transmission chamber, the planetary assembly being provided with a magnetic ring corresponding to the excitation part, for driving the planetary assembly to rotate and output torque;

[0011] a transmission assembly, wherein the input end of the transmission assembly is connected to the output end of the planetary assembly, and the output end of the transmission assembly contacts the input end of the valve needle assembly, and is used to convert the torque of the planetary assembly into a linear motion that drives the valve needle assembly to move along the first direction;

[0012] In which, the valve needle assembly includes a valve needle, a base, a connecting sleeve, an elastic member, and a sealing member; a guide hole with an axis in a first direction is provided on the base; the connecting sleeve is arranged in the transmission chamber, and the first end of the connecting sleeve is threadedly connected to the base to form a combination, and the combination is threadedly connected to the inner wall surface of the transmission chamber; the valve needle is inserted into the guide hole and the inner cavity of the connecting sleeve, and the valve needle is slidably connected to the guide hole, and the first end of the valve needle extends into the valve chamber for sealing or opening the valve chamber; the two ends of the elastic member are respectively connected to the base and the second end of the valve needle; the sealing member is arranged in the gap between the connecting sleeve and the valve body assembly.

[0013] The electronic expansion valve of the present invention is characterized in that the outer side of the base is respectively provided with a first external thread and a second external thread along a first direction; the inner cavity of the first end of the connecting sleeve is provided with a first internal thread, and the outer side of the first end of the connecting sleeve is provided with a third external thread identical to the second external thread; the connecting sleeve is connected to the base via the first external thread and the first internal thread, and the second external thread and the third external thread are combined into a fourth external thread; the inner wall surface of the transmission chamber is provided with a second internal thread, and the connecting sleeve and the base are connected to the transmission chamber via the fourth external thread and the second internal thread.

[0014] In the electronic expansion valve of the present invention, the sealing member includes a first seal and a second seal, and the first seal and the second seal are sequentially arranged in the gap between the connecting sleeve and the valve body assembly.

[0015] In the electronic expansion valve of the present invention, the second end of the valve needle is threadedly connected to a self-locking nut, the elastic member is sleeved on the valve needle, and its two ends are respectively connected to the self-locking nut and the base.

[0016] In the electronic expansion valve of the present invention, the transmission assembly includes a transmission seat and a transmission shaft; the transmission seat is arranged in the inner cavity of the connecting sleeve, and the transmission seat is provided with transmission threaded holes arranged along a first direction; the transmission shaft is threadedly connected to the transmission threaded holes, and the first end of the transmission shaft contacts the second end of the valve needle, and the second end of the transmission shaft is provided with a polygonal transmission hole.

[0017] The electronic expansion valve of the present invention, the planetary assembly is a two-stage planetary gear transmission assembly, including an input shaft, a central shaft, a first planetary assembly, and a second planetary assembly;

[0018] The input shaft, the first planetary assembly, and the second planetary assembly are sequentially sleeved on the central shaft; and the input shaft and the planetary disk of the second planetary assembly are rotatably connected to the transmission chamber via bearings respectively;

[0019] The magnetic ring is provided on the input shaft to drive the input shaft to rotate; the input shaft is connected to the sun gear of the first planetary assembly; the planetary disk of the first planetary assembly is connected to the sun gear of the second planetary assembly; the planetary disk of the second planetary assembly is provided with an output shaft, and the output shaft is transmission-connected to the input end of the transmission assembly.

[0020] The electronic expansion valve of the present invention, the excitation part includes an excitation assembly, a housing end cover and a housing shell;

[0021] The excitation assembly is arranged on the valve body assembly and cooperates to form an excitation space;

[0022] The cover shell is arranged in the excitation space; the cover shell end cover is installed on the first end of the cover shell, and the second end of the cover shell is connected to the connecting sleeve to cooperate to form the transmission chamber.

[0023] In the electronic expansion valve of the present invention, the excitation assembly includes an excitation shell and an electromagnetic coil; the excitation shell is arranged on the valve body assembly and cooperates to form the excitation space; the electromagnetic coil is arranged in the excitation shell, and the electromagnetic coil is arranged around the magnetic ring; the excitation shell is provided with a communication interface electrically connected to the electromagnetic coil.

[0024] In the electronic expansion valve of the present invention, a control chamber is further provided in the excitation part, a control part is provided in the control chamber, and the control part is signal-connected to the excitation part.

[0025] The electronic expansion valve of the present invention, the valve body assembly includes a valve body and a valve seat; the valve seat is arranged in the valve body, and the valve chamber is provided in the valve seat; the valve body is provided with an inlet, an outlet and an execution port connected to the valve chamber; the excitation part is arranged on the valve body and cooperates with the execution port to form the transmission chamber.

[0026] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0027] 1. One embodiment of the present invention provides an electronic expansion valve comprising a valve body assembly, a valve needle assembly, an excitation unit, a planetary assembly, and a transmission assembly. The excitation unit excites the magnetic ring on the planetary assembly to rotate, and the planetary assembly transmits the rotation to the transmission assembly, which converts the rotation into linear motion to push the valve needle assembly to open or close the valve chamber within the valve body assembly, thereby achieving the function of the electronic expansion valve. The valve needle assembly is also configured to include a valve needle, a base, a connecting sleeve, an elastic member, and a sealing member. The valve needle is slidably connected to the base via the elastic member. The base and the connecting sleeve are threadedly connected to form an assembly. This assembly is also threadedly connected to the valve body assembly, and a sealing member is provided at the gap between the assembly and the valve body assembly to seal the gap, thereby achieving a connection between the valve needle assembly and the valve body assembly. By adopting a threaded assembly form to replace the existing interference fit assembly form, assembly only requires screwing in, and the requirements for processing accuracy are lower; at the same time, a seal is provided to seal leakage caused by threaded assembly difficulties, so as to achieve a better sealing effect than the original assembly form, and solve the problems of difficulty in processing and assembling the valve needle part and the valve body of the existing electronic expansion valve.

[0028] 2. In one embodiment of the present invention, the guide portion of the valve needle is divided into two parts, namely a base and a connecting sleeve, which are processed and connected by threads. This reduces the processing difficulty and is simple to assemble.

[0029] 3. In one embodiment of the present invention, a threaded self-locking nut is provided at the second end of the valve needle to confine the elastic member between the self-locking nut and the base, so as to provide the elastic force required for the valve needle to open the valve chamber. The process is easy to process, easy to implement in terms of technology, and easy to assemble. At the same time, it is convenient for maintenance and replacement.

[0030] 4. In one embodiment of the present invention, the existing cover provided on the planetary assembly and the magnetic ring is divided into a cover shell and a cover end cover. The two ends of the cover shell are respectively welded to the cover end cover and the connecting sleeve, and are divided into two parts. The processing is simple, and the problem of low yield rate caused by easy breakage of the existing cover during stretching processing is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A cross-sectional view of the electronic expansion valve of the present invention;

[0032] Figure 2 A cross-sectional view of the electronic expansion valve of the present invention without a control plate and an induction magnetic ring;

[0033] Figure 3 A cross-sectional view of a solution of the electronic expansion valve of the present invention having a control plate and an induction magnetic ring;

[0034] Figure 4 An exploded view of the planetary assembly and transmission assembly of the electronic expansion valve of the present invention;

[0035] Figure 5 An exploded view of the valve needle assembly of the electronic expansion valve of the present invention.

[0036] Explanation of the accompanying drawings: 1: valve body; 2: valve seat; 3: valve needle; 4: base; 5: connecting sleeve; 6: sealing member; 7: elastic member; 8: transmission seat; 9: transmission shaft; 10: magnetic ring; 11: center shaft; 12: first planetary gear set; 13: first planetary disk; 14: second planetary gear set; 15: second planetary disk; 16: ring gear; 17: first rolling bearing; 18: second rolling bearing; 19: ring gear seat; 20: excitation housing; 21: cover end cover; 22: cover housing; 23: control panel; 24: cover plate; 25: self-locking nut; 26: magnetic ring; 27: first sun gear. DETAILED DESCRIPTION

[0037] The electronic expansion valve and refrigeration system proposed by the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description and claims.

[0038] Example 1

[0039] See Figures 1 to 5 In one embodiment, an electronic expansion valve includes a valve body assembly, a valve needle assembly, an excitation part, a planetary assembly, and a transmission assembly.

[0040] The valve body assembly is provided with a valve chamber. A valve needle assembly is movably disposed within the valve chamber along a first direction and is used to seal or open the valve chamber. An excitation unit is provided on the valve body assembly and cooperates with the valve body assembly to form a transmission chamber. A planetary assembly is rotatably connected to the transmission chamber. A magnetic ring 10 corresponding to the excitation unit is provided on the planetary assembly, driving the planetary assembly to rotate and output torque. The input end of the transmission assembly is connected to the output end of the planetary assembly, which contacts the input end of the valve needle assembly, converting the torque of the planetary assembly into linear motion that propels the valve needle assembly in the first direction.

[0041] The valve needle assembly includes a valve needle 3, a base 4, a connecting sleeve 5, an elastic member 7, and a sealing member 6. The base 4 is provided with a guide hole whose axis is in a first direction. The connecting sleeve 5 is arranged in the transmission chamber, and the first end of the connecting sleeve 5 is threadedly connected to the base 4 to form a combination, and the combination is threadedly connected to the inner wall surface of the transmission chamber. The valve needle 3 is inserted into the guide hole and the inner cavity of the connecting sleeve 5, and the valve needle 3 is slidably connected to the guide hole. The first end of the valve needle 3 extends into the valve chamber for blocking or opening the valve chamber. The two ends of the elastic member 7 are respectively connected to the base 4 and the second end of the valve needle 3. The sealing member 6 is arranged in the gap between the connecting sleeve 5 and the valve body assembly.

[0042] This embodiment provides an electronic expansion valve comprising a valve body assembly, a valve needle assembly, an excitation unit, a planetary assembly, and a transmission assembly. The excitation unit excites the magnetic ring 10 on the planetary assembly to rotate, which is then transmitted to the transmission assembly by the planetary assembly. The transmission assembly converts this rotation into linear motion, which drives the valve needle assembly to open or close the valve chamber within the valve body assembly, thereby achieving the function of the electronic expansion valve. The valve needle assembly is also configured to include a valve needle 3, a base 4, a connecting sleeve 5, an elastic member 7, and a sealing member 6. The valve needle 3 is slidably connected to the base 4 via the elastic member 7. The base 4 and the connecting sleeve 5 are threadedly connected to form an assembly. This assembly is also threadedly connected to the valve body assembly, and a sealing member 6 is provided in the gap between the assembly and the valve body assembly to seal the gap, thereby achieving the connection between the valve needle assembly and the valve body assembly. By adopting a threaded assembly form to replace the existing interference fit assembly form, assembly only requires screwing in, and the requirements for processing accuracy are lower; at the same time, a seal 6 is provided to seal leakage caused by threaded assembly difficulties, so as to achieve a better sealing effect than the original assembly form, and solve the problems of difficulty in processing and assembling the valve needle part and the valve body 1 of the existing electronic expansion valve.

[0043] The specific structure of the electronic expansion valve of this embodiment is further described below:

[0044] In this embodiment, the valve assembly specifically includes a valve body 1 and a valve seat 2. The valve seat 2 is disposed within the valve body 1, and the valve chamber described above is housed within the valve seat 2. The valve body 1 is provided with an inlet, an outlet, and an actuator port that communicate with the valve chamber. The excitation unit is disposed on the valve body 1 and cooperates with the actuator port to form the transmission chamber described above. Furthermore, screw holes or other connection interfaces may be provided on both sides of the valve body 1 to allow brackets to be installed on both sides of the valve body 1, facilitating the installation of the electronic expansion valve in specific application scenarios.

[0045] In this embodiment, see Figure 5 , the specific structure of the base 4 and the connecting sleeve 5 is as follows: the outer side of the base 4 may be provided with a first external thread and a second external thread along the first direction respectively. The inner cavity of the first end of the connecting sleeve 5 is provided with a first internal thread, and the outer side of the first end of the connecting sleeve 5 is provided with a third external thread that is the same as the second external thread. When connected, the connecting sleeve 5 is connected to the base 4 through the first external thread and the first internal thread, and at this time, the second external thread and the third external thread are combined into a complete fourth external thread. A second internal thread corresponding to the fourth external thread may be provided on the inner wall surface of the valve body 1, and the combination of the connecting sleeve 5 and the base 4 can be connected to the valve body 1 through the fourth external thread and the second internal thread. The guide part of the valve needle 3 is divided into two parts, the base 4 and the connecting sleeve 5, for processing, and connected by threads. The processing difficulty is low and the assembly is simple.

[0046] Furthermore, the seal 6 includes a first seal and a second seal, which are sequentially arranged in the gap between the connecting sleeve 5 and the valve body 1. The first seal and the second seal can both be O-rings. Two sealing grooves are provided in the valve body 1 at positions corresponding to the gap, and the O-rings are arranged in the sealing grooves to achieve sealing. The assembly method of the sealing ring is relatively mature and simple.

[0047] Furthermore, a self-locking nut 25 can be threadedly connected to the second end of the valve needle 3, and the elastic member 7 can be sleeved on the valve needle 3, with its two ends respectively connected to the self-locking nut 25 and the base 4. By providing a threaded self-locking nut 25 at the second end of the valve needle 3, the elastic member 7 is confined between the self-locking nut 25 and the base 4, thereby providing the elastic force required for the valve needle 3 to open the valve chamber. This reduces the processing difficulty, is easy to implement in terms of technology, and has low assembly difficulty. It also facilitates maintenance and replacement.

[0048] In this embodiment, see Figure 4 The transmission assembly may specifically include a transmission seat 8 and a transmission shaft 9. The transmission seat 8 is fixedly disposed within the inner cavity of the connecting sleeve 5 and has threaded transmission holes arranged along a first direction. The transmission shaft 9 is threadedly connected to the threaded transmission holes, with the first end of the transmission shaft 9 contacting the second end of the valve needle 3. The second end of the transmission shaft 9 is provided with a polygonal transmission hole. Specifically, the thread of the threaded transmission hole may be a T-shaped internal thread, and the transmission shaft 9 may be provided with a corresponding T-shaped external thread, thereby achieving a threaded transmission connection.

[0049] In this embodiment, the planetary assembly is a two-stage planetary gear transmission assembly, comprising an input shaft, a central shaft 11, a first planetary assembly, and a second planetary assembly. The input shaft, the first planetary assembly, and the second planetary assembly are sequentially sleeved on the central shaft 11. The planetary discs of the input shaft and the second planetary assembly are rotatably connected to the transmission chamber via bearings. A magnetic ring 10 is provided on the input shaft, configured to rotate the input shaft under the excitation of the excitation unit. The input shaft is connected to the sun gear of the first planetary assembly. The planetary disc of the first planetary assembly is connected to the sun gear of the second planetary assembly. The planetary disc of the second planetary assembly is provided with an output shaft, which is in transmission connection with the second end of the transmission shaft 9. Specifically, the output shaft can be a polygon corresponding to the polygonal transmission hole, such as a quadrilateral or hexagon, but this is not specifically limited here. The polygonal connection transmission method is adopted because the planetary disc of the second planetary assembly is stationary in the first direction, while the transmission shaft 9 converts the rotation into linear motion, causing the transmission shaft 9 to move in the first direction. Therefore, a fixed connection method cannot be used for transmission. Therefore, a sliding connection between the hole and the shaft is adopted, which uses geometric shape for transmission.

[0050] For details, see Figure 4The first planetary assembly includes a first sun gear 27, a first planetary gear set 12, and a first planetary disc 13. The second planetary assembly includes a second sun gear, a second planetary gear set 14, and a second planetary disc 15. The first and second planetary assemblies also include a common ring gear 16 and ring gear seat 19. The ring gear seat 19 is mounted on the connecting sleeve 5, and the ring gear 16 is mounted on the ring gear seat 19. The ring gear 16 is sleeved on the first and second planetary assemblies. The specific transmission connection process is that the magnetic ring 10 drives the input shaft, which rotates around the central axis 11 and drives the first sun gear 27 to rotate. The rotation of the first sun gear 27 can drive the meshing first planetary gear set 12 to rotate. The first planetary gear set 12 is also meshed with the fixed ring gear 16, thereby driving the first planetary disc 13 to rotate, achieving the first stage of reduction. The first planetary plate 13 is fixedly connected to the second sun gear, thereby driving the second sun gear to rotate, and the second sun gear drives the second planetary gear set 14 to rotate. At the same time, under the action of the fixed ring gear 16, the second planetary gear set 14 drives the second planetary plate 15 to rotate, thereby realizing the second stage of deceleration, and the output shaft on the second planetary plate 15 transmits the rotation to the transmission shaft 9.

[0051] The input shaft and magnetic ring 10 can be integrally formed or assembled separately, depending on production requirements. The input shaft is rotatably connected to the transmission chamber via a first rolling bearing 17, while the second planetary plate 15 is rotatably connected to the ring gear seat 19 via a second rolling bearing 18.

[0052] In this embodiment, the excitation unit specifically includes an excitation assembly, a housing end cap 21, and a housing shell 22. The excitation assembly is mounted on the valve body 1 and communicates with the actuator port, forming an excitation space. The housing shell 22 is disposed within the excitation space. The housing end cap 21 is mounted on the first end of the housing shell 22, and the second end of the housing shell 22 is connected to the connecting sleeve 5 to form the aforementioned transmission chamber. Specifically, the housing end cap 21, the housing shell 22, and the connecting sleeve 5 cooperate with the valve body 1 to form the transmission chamber.

[0053] Furthermore, the excitation assembly specifically includes an excitation housing 20 and an electromagnetic coil. The excitation housing 20 is mounted on the valve body 1 to form the aforementioned excitation space. The electromagnetic coil is housed within the excitation housing 20 and surrounds the magnetic ring 10. The excitation housing 20 includes a communication port electrically connected to the electromagnetic coil, for supplying power to the electromagnetic coil and receiving external control signals.

[0054] Furthermore, a control chamber may be provided within the excitation housing 20, housing a control unit, specifically a control board 23. The control board 23 is connected to the electromagnetic coil signal, receiving external signals and outputting control signals to the electromagnetic coil, thereby controlling the rotational speed of the magnetic ring 10. The control board 23 is integrated within the valve body 1 to facilitate control of the valve body 1. Furthermore, an opening may be provided in the control chamber, sealed with a cover 24 to facilitate installation and replacement of the control board 23. In specific application scenarios, such as electric vehicles, if the electric vehicle control platform has strong computing power, an electronic expansion valve without the control board 23 can be installed. If the control platform has weak computing power, an electronic expansion valve with the control board 23 can be used. After the control platform outputs parameters, the control board 23 receives them and converts them into control signals to control the opening of the electronic expansion valve.

[0055] Furthermore, an induction magnetic ring 26 can be installed on the input shaft or magnetic ring 10, and a corresponding Hall effect sensor can be installed on the control board 23. The induction magnetic ring 26 is magnetized on its end face and has two poles (N and S). The function of the induction magnetic ring 26 is to generate a magnetic field. When the induction magnetic ring 26 rotates one circle, it generates voltage fluctuations. The Hall effect sensor above it will sense the periodic changes in the magnetic field and record the changing angle of the induction magnetic ring 26, thereby accurately identifying the position of the induction magnetic ring 26. In turn, the speed of the drive shaft 9, the distance the valve needle 3 is pushed, and other parameters can be determined, so that the control board 23 can control the magnetic field generated by the electromagnetic coil.

[0056] Example 2

[0057] A refrigeration system includes the electronic expansion valve of the first embodiment. By replacing the existing interference fit assembly with a threaded assembly for connecting the internal components of the electronic expansion valve, assembly requires only screwing, requiring less precision. A seal 6 is provided to seal leaks that may otherwise be caused by threaded assembly, achieving a better sealing effect than the existing assembly. This solves the manufacturing and assembly difficulties associated with the valve needle and valve body 1 of existing electronic expansion valves.

[0058] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the scope of protection of the present invention.

Claims

1. An electronic expansion valve, characterized in that: include: A valve body assembly, wherein a valve chamber is provided in the valve body assembly; a valve needle assembly, the valve needle assembly being movably disposed in the valve chamber along a first direction and being used for blocking or opening the valve chamber; An excitation part, the excitation part is provided on the valve body assembly and cooperates with the valve body assembly to form a transmission chamber; a planetary assembly, the planetary assembly being rotatably connected to the transmission chamber, the planetary assembly being provided with a magnetic ring corresponding to the excitation part, for driving the planetary assembly to rotate and output torque; a transmission assembly, wherein the input end of the transmission assembly is connected to the output end of the planetary assembly, and the output end of the transmission assembly contacts the input end of the valve needle assembly, and is used to convert the torque of the planetary assembly into a linear motion that drives the valve needle assembly to move along the first direction; wherein, the valve needle assembly comprises a valve needle, a base, a connecting sleeve, an elastic member, and a sealing member; the base is provided with a guide hole with an axis in a first direction; the connecting sleeve is arranged in the transmission chamber, the first end of the connecting sleeve is threadedly connected to the base to form a combination, and the combination is threadedly connected to the inner wall surface of the transmission chamber; the valve needle is inserted into the guide hole and the inner cavity of the connecting sleeve, and the valve needle is slidably connected to the guide hole, and the first end of the valve needle extends into the valve chamber for blocking or opening the valve chamber; the two ends of the elastic member are respectively connected to the base and the second end of the valve needle; the sealing member is provided in the gap between the connecting sleeve and the valve body assembly; The outer side of the base is respectively provided with a first external thread and a second external thread along a first direction; the inner cavity of the first end of the connecting sleeve is provided with a first internal thread, and the outer side of the first end of the connecting sleeve is provided with a third external thread identical to the second external thread; the connecting sleeve is connected to the base through the first external thread and the first internal thread, and the second external thread and the third external thread are combined to form a fourth external thread; the inner wall surface of the transmission chamber is provided with a second internal thread, and the connecting sleeve and the base are connected to the transmission chamber through the fourth external thread and the second internal thread; The sealing member includes a first seal and a second seal, wherein the first seal and the second seal are sequentially arranged at the gap between the connecting sleeve and the valve body assembly; The second end of the valve needle is threadedly connected to a self-locking nut, and the elastic member is sleeved on the valve needle, and its two ends are respectively connected to the self-locking nut and the base; The transmission assembly includes a transmission seat and a transmission shaft; the transmission seat is arranged in the inner cavity of the connecting sleeve, and the transmission seat is provided with a transmission threaded hole arranged along a first direction; the transmission shaft is threadedly connected to the transmission threaded hole, and the first end of the transmission shaft contacts the second end of the valve needle, and the second end of the transmission shaft is provided with a polygonal transmission hole.

2. The electronic expansion valve according to claim 1, characterized in that: The planetary assembly is a two-stage planetary gear transmission assembly, comprising an input shaft, a center shaft, a first planetary assembly, and a second planetary assembly; The input shaft, the first planetary assembly, and the second planetary assembly are sequentially sleeved on the central shaft; and the input shaft and the planetary disk of the second planetary assembly are rotatably connected to the transmission chamber via bearings respectively; The magnetic ring is provided on the input shaft to drive the input shaft to rotate; the input shaft is connected to the sun gear of the first planetary assembly; the planetary disk of the first planetary assembly is connected to the sun gear of the second planetary assembly; the planetary disk of the second planetary assembly is provided with an output shaft, and the output shaft is transmission-connected to the input end of the transmission assembly.

3. The electronic expansion valve according to claim 1, wherein: The excitation part includes an excitation assembly, a cover end cover and a cover shell; The excitation assembly is arranged on the valve body assembly and cooperates to form an excitation space; The cover shell is arranged in the excitation space; the cover shell end cover is installed on the first end of the cover shell, and the second end of the cover shell is connected to the connecting sleeve to cooperate to form the transmission chamber.

4. The electronic expansion valve according to claim 3, characterized in that: The excitation assembly includes an excitation shell and an electromagnetic coil; the excitation shell is arranged on the valve body assembly and cooperates to form the excitation space; the electromagnetic coil is arranged in the excitation shell, and the electromagnetic coil is arranged around the magnetic ring; the excitation shell is provided with a communication interface electrically connected to the electromagnetic coil.

5. The electronic expansion valve according to claim 1, characterized in that: A control chamber is further provided in the excitation part. A control part is provided in the control chamber, and the control part is signal-connected to the excitation part.

6. The electronic expansion valve according to claim 1, characterized in that: The valve body assembly includes a valve body and a valve seat; the valve seat is arranged in the valve body, and the valve chamber is arranged in the valve seat; the valve body is provided with an inlet, an outlet and an execution port connected to the valve chamber; the excitation part is arranged on the valve body and cooperates with the execution port to form the transmission chamber.

7. A refrigeration system, characterized in that: The electronic expansion valve comprises the electronic expansion valve as described in any one of claims 1 to 6.

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