Electronic expansion valve

Abstract

The utility model discloses an electronic expansion valve, and belongs to the technical field of electronic expansion valves. The valve mainly comprises a rotor assembly, a valve body assembly and a valve needle assembly, wherein the valve needle assembly comprises a limiting seat fixedly connected with the valve body assembly and a rotating shaft fixedly connected with a rotor of the rotor assembly; the rotating shaft is connected with a limiting seat with a hollow structure through a bearing; the tail end of the rotating shaft is in threaded connection with the valve needle assembly; a lower valve seat of the valve body assembly is provided with a valve port matched with a valve needle of the valve needle assembly. The utility model has the advantages of small volume, stable rotor operation, high refrigerant flow control precision, no abrasion between the valve port and the valve needle, stability, reliability and long product service life, and has important significance in the field of electronic expansion technology improvement.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic expansion valves, and more specifically, to an electronic expansion valve with a small size, stable rotor operation, high refrigerant flow control accuracy, no wear on the valve port and valve needle, stability, reliability, and long product service life. Background Art

[0002] An electronic expansion valve is a throttling element that regulates the flow of refrigerant entering a refrigeration unit according to a preset program. It uses an electrical signal generated by the regulated parameter to control the voltage or current applied to the expansion valve, thereby regulating the flow rate. Electronic expansion valves are widely used in various refrigeration systems, including residential and commercial air conditioners, automotive air conditioners, and industrial refrigeration equipment.

[0003] The structure of a traditional electronic expansion valve is disclosed in the literature in the Chinese patent with the authorization announcement CN211599545U and the invention name of electronic expansion valve: it mainly includes a shell, a guide sleeve and a valve needle assembly. Among them, the guide sleeve is fixedly arranged in the shell, the valve needle assembly is movably inserted into the guide sleeve, and the valve needle assembly is arranged corresponding to the valve port. The outer wall of the valve needle assembly is arranged corresponding to the inner wall of the guide sleeve, and the valve needle assembly can move along the axial direction of the guide sleeve. The guide sleeve is used to guide the valve needle assembly to ensure the coaxiality between the valve needle assembly and the valve port. It also includes a rotor, a nut seat and a screw. The rotor is rotatably arranged in the shell, the nut seat is fixedly arranged in the shell, and the screw is movably inserted into the nut seat. The rotor is connected to the screw drive, and the valve needle assembly is arranged at one end of the screw to drive the valve needle assembly to move axially through the screw, thereby realizing the opening and closing of the valve port. The valve needle assembly also includes a pressing sleeve, a bushing and a pre-tightening spring. The pressing sleeve is fixedly arranged at the upper end of the spring sleeve, the screw is passed through the pressing sleeve, the bushing is sleeved on the screw, and the bushing is located between the pressing sleeve and the valve needle. By sleeveing ​​one end of the pre-tightening spring on the bushing, the other end of the pre-tightening spring is sleeved on the valve needle.

[0004] From the above, it can be seen that the structural design of the traditional electronic expansion valve has the following defects:

[0005] 1. In addition to rotational motion, the rotor of a traditional electronic expansion valve also moves axially following the screw and valve needle. Space for the rotor's axial motion needs to be reserved. As a result, traditional electronic expansion valves are relatively large and occupy a large space.

[0006] 2. The screw of the traditional electronic expansion valve is threadedly connected to the nut seat. There will be machining errors during the fine machining of both the nut seat and the screw, and there must be a fitting gap between the screw and the nut seat. Therefore, when the screw makes a spiral motion relative to the nut seat, there will be a slight jitter phenomenon. The rotor is fixedly connected to the screw, so the rotor will also have a slight jitter phenomenon. However, the jitter of the rotor can easily cause the product to "lose steps" (the so-called "lost steps" refers to the phenomenon that during the operation of the electronic expansion valve, due to some reasons, its stepper motor does not rotate according to the expected number of steps, so that the actual position of the valve needle is inconsistent with the position expected by the control signal), resulting in the valve needle position of the electronic expansion valve unable to accurately reach the position specified by the control signal, thereby further affecting the refrigerant flow control accuracy and the operation effect of the refrigeration system;

[0007] 3. In addition to axial movement, the valve needle of the traditional electronic expansion valve also performs synchronous rotational movement, which causes the valve needle and the valve port to frequently contact, resulting in serious wear of the valve needle and the valve port. The accuracy of the electronic expansion valve will gradually deteriorate, the reliability is relatively poor, and the product service life is short. Utility Model Content

[0008] The purpose of the utility model is to address the deficiencies in the existing technology and provide an electronic expansion valve with a small size, stable rotor operation, high refrigerant flow control accuracy, no wear on the valve port and valve needle, stability and reliability, and a long product life.

[0009] The utility model is realized through the following technical solutions:

[0010] An electronic expansion valve includes a rotor assembly, a valve body assembly, and a valve needle assembly. The valve needle assembly includes a limit seat fixedly connected to the valve body assembly and a rotating shaft fixedly connected to the rotor of the rotor assembly; the rotating shaft is connected to the limit seat with a hollow structure via a bearing, and the end of the rotating shaft is threadedly connected to the valve needle assembly; a valve port is provided on the lower valve seat of the valve body assembly, which is compatible with the valve needle of the valve needle assembly.

[0011] Preferably, the rotating shaft comprises a non-threaded section and a threaded section;

[0012] The valve needle assembly includes an abutment platform threadedly connected to the threaded section, and the abutment platform is fixed with a valve needle sleeve embedded in the lower valve seat and with a clearance fit with the lower valve seat; the valve needle sleeve is a cavity structure, and a compression spring is provided inside it to keep the limiting end face of the valve needle in close contact with the bottom surface of the valve needle sleeve.

[0013] Preferably, the upper end of the compression spring is in press contact with the lower end surface of the abutment platform, and the lower end of the compression spring is in press contact with the head of the valve needle via the spring seat.

[0014] Preferably, a guide column for guiding the abutting platform to make axial movement is fixedly provided in the cavity of the limiting seat, and a guide through hole adapted to the guide column is provided on the abutting platform.

[0015] Preferably, the valve needle assembly is also provided with a retaining ring fixed integrally with the abutment platform and / or the valve needle sleeve; the abutment platform is T-shaped; the space formed by the circumference of the abutment platform and the retaining ring is a sealing ring groove, which is used to accommodate an extruded sealing ring; a retaining ring is provided between the extruded sealing ring and the inner wall of the limit seat to accommodate the extruded sealing ring in an extruded state in the sealing ring groove.

[0016] Preferably, the inner ring of the retaining ring is in the sealing ring groove, and the outer ring of the retaining ring is in contact with the inner wall of the limiting seat.

[0017] Preferably, the lower valve seat is provided with a plurality of flow openings for circulating gas in the circumferential direction;

[0018] The valve body assembly also includes a valve body and a valve shell; the valve body is provided with an air flow channel 1 for communicating with the flow port, an air flow channel 2 for communicating with the valve port, an upper valve seat mounting cavity for accommodating the upper valve seat, and a lower valve seat accommodating cavity for accommodating the lower valve seat; the valve shell is fixedly connected to the upper valve seat.

[0019] Preferably, the limit seat is supported by the upper valve seat and is fixedly connected to the upper valve seat by welding.

[0020] Preferably, the fixed connection between the upper valve seat and the valve body is achieved by a fixing ring threadedly connected to the valve body.

[0021] Preferably, the rotor assembly also includes a guide rail spring that is sleeved on the rotating shaft and fixedly connected to the limit seat, and a stop ring is coiled on the guide rail spring; the head of the rotating shaft is fixedly connected to the rotor through a rotor fixing plate; a stop rod that pushes the stop ring is also fixed on the rotor fixing plate.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] The rotor and the rotating shaft of the utility model both rotate on their own, and the operation is stable without jitter, and thus the product "lost step" phenomenon caused by jitter will not occur. The refrigerant flow control accuracy is high, and the operation effect of the entire refrigeration system is good;

[0024] The rotor of the utility model has no axial movement, and no space is required for the rotor to move. The rotor is compact and effectively saves installation space. At the same time, the valve housing is reduced in size, which can reduce the manufacturing cost of the valve housing.

[0025] The valve needle of the utility model has no circumferential movement. During the opening and closing process, there is no rotational friction between the valve needle and the valve port. The flow accuracy of the electronic expansion valve is stable and reliable for a long time, and the product has a long service life.

[0026] The utility model has ingenious structural improvement, high control precision, strong practicability and strong market competitiveness, and is of great significance in the field of electronic expansion technology improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional directional structure of the utility model.

[0028] Figure 2 It is a cross-sectional view of the structures shown in Example 1, Example 2 and Example 3.

[0029] Figure 3 This utility model Figure 2 Enlarged view of point A in the middle.

[0030] Figure 4 This is a schematic diagram of the assembly structure of the bearing, limit seat, abutment platform, etc. in the structure shown in Example 3 Figure 1 .

[0031] Figure 5 This is a schematic diagram of the assembly structure of the bearing, limit seat, abutment platform, etc. in the structure shown in Example 3 Figure 2 .

[0032] Figure 6 It is a cross-sectional view of the structure shown in Example 4.

[0033] Figure 7 This utility model Figure 6 Enlarged view of point B in the middle.

[0034] In the figure: 1. rotor assembly; 11. guide rail spring; 12. stop ring; 13. rotor fixing plate; 14. rotor; 15. stop rod; 2. valve body assembly; 21. lower valve seat; 211. valve port; 212. flow port; 22. valve body; 221. air flow channel 1; 222. air flow channel 2; 223. upper valve seat mounting cavity; 224. lower valve seat accommodating cavity; 23. upper valve seat; 24. valve housing; 25. fixing ring; 3. valve needle assembly; 31. rotating shaft; 311. threaded section; 32. bearing; 33. limit seat; 331. guide column; 34. valve needle assembly; 341. valve needle; 342. abutment platform; 343. valve needle sleeve; 344. compression spring; 345. spring seat; 346. retaining ring; 347. extrusion sealing ring; 348. sealing ring groove; 349. retaining ring. DETAILED DESCRIPTION

[0035] In order to enable readers to better understand the design purpose of the present invention, the technical solution of the present invention is further described below in conjunction with the embodiments. It should be noted that the directional nouns that may be involved in the following paragraphs, including but not limited to "up, down, left, right, front, back", etc., are based on the visual directions shown in the corresponding drawings of the specification, and should not be regarded as limiting the scope of protection or technical solution of the present invention. Its purpose is only to facilitate those skilled in the art to better understand the technical solution created by the present invention.

[0036] In the description of this specification, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0037] Example 1

[0038] like Figures 1 to 3 As shown, an electronic expansion valve includes a rotor assembly 1, a valve body assembly 2, and a valve needle assembly 3. The valve needle assembly 3 includes a limit seat 33 fixedly connected to the valve body assembly 2, and a rotating shaft 31 fixedly connected to the rotor 14 of the rotor assembly 1. The rotating shaft 31 is connected to the limit seat 33, which has a hollow structure, via a bearing 32. The inner ring of the bearing 32 is fixedly connected to the rotating shaft 31, and the outer ring of the bearing 32 is fixedly connected to the limit seat 33. The end of the rotating shaft 31 is threadedly connected to the valve needle assembly 34. The lower valve seat 21 of the valve body assembly 2 is provided with a valve port 211 that is compatible with the valve needle 341 of the valve needle assembly 34. In this embodiment, the rotating shaft 31 only has rotational motion, and the design of the bearing 32, limit seat 33 and other structures effectively avoids the problem of rotor jitter caused by the screw motion. The rotor 14 has no axial motion, so there is no need to reserve space for the rotor's axial motion when designing the housing, saving space, materials and costs.

[0039] The operation process of this embodiment is as follows: When the electronic expansion valve coil is energized, the rotor 14 of the rotor assembly 1 rotates, driving the rotary shaft 31 to rotate in place, i.e., to rotate on its own. The end of the rotary shaft 31 is threadedly connected to the valve needle assembly 34. When the rotary shaft 31 rotates on its own, the valve needle assembly 34 moves upward or downward relative to the rotary shaft 31. The up and down movement of the valve needle assembly 34 naturally drives the valve needle 341 up and down, thereby adjusting the opening of the valve port 211 to control the flow rate.

[0040] In this embodiment, the rotor and the rotating shaft both rotate on their own, and the operation is stable without jitter. Thus, there will be no "lost steps" phenomenon caused by jitter. The refrigerant flow control accuracy is high, and the operation effect of the entire refrigeration system is good.

[0041] In this embodiment, the rotor has no axial movement, and no space needs to be reserved for the rotor movement. The rotor is compact and effectively saves installation space. At the same time, the valve housing is reduced in size, which can reduce the manufacturing cost of the valve housing.

[0042] Example 2

[0043] Based on Example 1, this example continues to describe in detail the technical features involved and the functions and roles played by the technical features in the present utility model, so as to help technicians in this field fully understand the technical solution of the present utility model and reproduce it.

[0044] like Figures 1 to 3 As shown, an electronic expansion valve includes a rotor assembly 1, a valve body assembly 2, and a valve needle assembly 3. The valve needle assembly 3 includes a limit seat 33 fixedly connected to the valve body assembly 2, and a rotating shaft 31 fixedly connected to the rotor 14 of the rotor assembly 1; the rotating shaft 31 is connected to the limit seat 33 with a hollow structure via a bearing 32, and the end of the rotating shaft 31 is threadedly connected to the valve needle assembly 34; a valve port 211 is provided on the lower valve seat 21 of the valve body assembly 2, which is adapted to the valve needle 341 of the valve needle assembly 34.

[0045] In this embodiment, the rotating shaft 31 includes a non-threaded section and a threaded section 311. The valve needle assembly 34 specifically includes an abutment platform 342 threadedly connected to the threaded section 311. A valve needle sleeve 343, embedded within and loosely fitted to the lower valve seat 21, is fixed to the abutment platform 342. The valve needle sleeve 343 is welded to the abutment platform 342. The valve needle sleeve 343 is a hollow structure containing a compression spring 344 that secures the limiting end face of the valve needle 341 in close contact with the bottom surface of the valve needle sleeve 343. The upper end of the compression spring 344 presses against the lower end face of the abutment platform 342, while the lower end of the compression spring 344 presses against the head of the valve needle 341 via a spring seat 345. Regardless of whether the valve needle assembly 34 is moving upward or downward, or where the valve needle 341 moves, the compression spring 344 remains compressed, ensuring that the valve needle 341 maintains close contact with the valve needle sleeve 343. In other words, the valve needle 341 is a movable part, maintained in close contact with the valve needle sleeve 343 by the action of the compression spring 344. This design allows the valve needle 341 to move up and down with the valve needle sleeve 343, but does not rotate with it. Therefore, during the opening and closing of the electronic expansion valve, the valve needle 341 and the valve port 211 are not subject to wear. Even with long-term use, wear between the valve needle and the valve port will not affect the control accuracy of the product, effectively ensuring the product's service life.

[0046] In this embodiment, the lower valve seat 21 is circumferentially defined with a plurality of flow openings 212 for gas circulation. The valve body assembly 2 further comprises a valve body 22 and a valve housing 24. The valve body 22 is provided with a first airflow channel 221 for communicating with the flow openings 212, a second airflow channel 222 for communicating with the valve port 211, an upper valve seat mounting cavity 223 for accommodating the upper valve seat 23, and a lower valve seat accommodating cavity 224 for accommodating the lower valve seat 21. The valve housing 24 is fixedly connected to the upper valve seat 23. The connection between the upper valve seat 23 and the valve body 22 is achieved by a retaining ring 25 threadedly connected to the valve body 22. The rotor assembly 1 further comprises a guide spring 11 sleeved on the rotating shaft 31 and fixedly connected to the limit seat 33. A stop ring 12 is coiled around the guide spring 11. The head of the rotating shaft 31 is fixedly connected to the rotor 14 via a rotor fixing plate 13. A stop rod 15 for pushing the stop ring 12 is also fixedly mounted on the rotor fixing plate 13. The structural designs of the rotor assembly 1 and the valve body assembly 2 are the same as those of the conventional ones, and will not be described in detail to avoid cumbersome writing.

[0047] In this embodiment, the limiting seat 33 is supported by the upper valve seat 23 and is fixedly connected to the upper valve seat 23 by welding.

[0048] The operation process of this embodiment is as follows: after the electronic expansion valve coil is energized, the rotor 14 of the rotor assembly 1 will rotate, and the rotor assembly 1 will drive the rotating shaft 31 to rotate in place, that is, to rotate on its own. The end of the rotating shaft 31 is threadedly connected to the abutment 342. When the rotating shaft 31 rotates on its own, the abutment 342 will make a spiral upward or downward movement relative to the rotating shaft 31. The valve needle sleeve 343 is fixed to the abutment 342 as a whole. The spiral up and down movement of the abutment 342 naturally drives the valve needle sleeve 343 to make a spiral up and down movement. However, the spiral up and down movement of the valve needle sleeve 343 will only drive the valve needle 341 to make a linear up and down movement. The valve needle 341 is pressed by the compression spring 344, which will release the circumferential force exerted by the valve needle sleeve 343 on the valve needle 341. Therefore, under the design of the structures such as the abutment platform 342, the valve needle sleeve 343, and the compression spring 344, the valve needle 341 only performs linear motion in the up and down directions, thereby adjusting the opening of the valve port 211 to control the flow rate.

[0049] In addition to the advantages of Example 1, this embodiment also has the following advantages:

[0050] The valve needle of this embodiment has no circumferential motion. During the opening and closing process, there is no rotational friction between the valve needle and the valve port. The flow accuracy of the electronic expansion valve is stable and reliable in the long term, and the product has a long service life.

[0051] The utility model has ingenious structural improvement, high control precision, strong practicability and strong market competitiveness, and is of great significance in the field of electronic expansion technology improvement.

[0052] Example 3

[0053] Based on Example 2, this example continues to describe in detail the technical features involved and the functions and roles played by the technical features in the present utility model, so as to help technicians in this field fully understand the technical solution of the present utility model and reproduce it.

[0054] Since the airflow movement inside the electronic expansion valve is complex during operation, when the rotation of the rotating shaft 31 drives the abutment 342 to perform a spiral motion, it is not ruled out that there is an aerodynamic force inside the electronic expansion valve that acts on the abutment 342 in the opposite direction of the force of the spiral motion, thereby affecting the actual axial motion stroke of the abutment 342. It is even possible that the abutment 342 rotates along with the rotating shaft 31, that is, the "follow-rotation" phenomenon.

[0055] like Figures 1 to 5 As shown, in this embodiment, a guide post 331 is fixedly disposed within the cavity of the limiting seat 33 to guide the axial movement of the abutment platform 342. For example, the guide post 331 is fixedly attached to the upper surface of the cavity of the limiting seat 33. The abutment platform 342 is provided with a guide hole that mates with the guide post 331. The coordination between the guide post 331 and the guide hole ensures that the abutment platform 342 moves up and down only along the guide post 331 under the action of the rotating shaft 31, eliminating interference from airflow on the movement of the abutment platform 342. Figure 2 、 Figure 3 This is a structural expression of both Embodiments 1 and 2, as well as Embodiment 3, because the guide post 331 of this embodiment is just blocked by the rotating shaft 31. This embodiment further improves the reliability of Embodiments 1 and 2, has a simple structural design, and is low in implementation cost.

[0056] Example 4

[0057] Based on Example 2, this example continues to describe in detail the technical features involved and the functions and roles played by the technical features in the present utility model, so as to help technicians in this field fully understand the technical solution of the present utility model and reproduce it.

[0058] This embodiment also solves the airflow interference problem mentioned in Example 3. This embodiment provides a technical solution different from Example 3.

[0059] like Figure 1 、 Figure 6-Figure 7As shown, the valve needle assembly 34 of this embodiment also includes a retaining ring 346 fixed integrally with the abutment platform 342 and / or the valve needle sleeve 343. The abutment platform 342 is T-shaped. The space formed by the circumference of the abutment platform 342 and the retaining ring 346 forms a sealing ring groove 348, which is used to accommodate the extrusion sealing ring 347. A retaining ring 349 is provided between the extrusion sealing ring 347 and the inner wall of the stop seat 33, which squeezes the extrusion sealing ring 347 within the sealing ring groove 348. The inner ring of the retaining ring 349 is located within the sealing ring groove 348, while the outer ring of the retaining ring 349 maintains a contact with the inner wall of the stop seat 33. The height of the retaining ring 349 is comparable to that of the sealing ring groove 348. The retaining ring 346 is fixedly connected to the abutment platform 342 and / or the valve needle sleeve 343 by welding. The retaining ring 349 is made of polytetrafluoroethylene.

[0060] The operating principle of this embodiment is as follows: the extrusion seal 347 utilizes its own elasticity to force the retaining ring 349 into contact with the stop seat 33. Both the retaining ring 349 and the inner wall of the stop seat 33 are smooth surfaces, resulting in very low friction, negligible to the driving force of the rotating shaft 31. Therefore, the retaining ring 349 has little effect on the axial movement of the abutment 342. However, the extrusion seal 347 exerts a radial pressure force against the inner wall of the stop seat 33. This pressure, along with the extrusion seal 347 itself, releases the aerodynamic forces that interfere with airflow, effectively mitigating the effects of airflow interference on the movement of the abutment 342.

[0061] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. All equivalent changes and modifications in the shape, structure, features and spirit of the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An electronic expansion valve, comprising a rotor assembly (1), a valve body assembly (2), and a valve needle assembly (3), characterized in that: The valve needle assembly (3) includes a limit seat (33) fixedly connected to the valve body assembly (2), and a rotating shaft (31) fixedly connected to the rotor (14) of the rotor assembly (1); the rotating shaft (31) is connected to the limit seat (33) with a hollow structure via a bearing (32), and the end of the rotating shaft (31) is threadedly connected to the valve needle assembly (34); a valve port (211) adapted to the valve needle (341) of the valve needle assembly (34) is provided on the lower valve seat (21) of the valve body assembly (2).

2. The electronic expansion valve according to claim 1, characterized in that: The rotating shaft (31) comprises a non-threaded section and a threaded section (311); The valve needle assembly (34) includes an abutment platform (342) threadedly connected to the threaded section (311), and the abutment platform (342) is fixed with a valve needle sleeve (343) embedded in the lower valve seat (21) and gap-matched with the lower valve seat (21); the valve needle sleeve (343) is a cavity structure, and a compression spring (344) is provided inside the cavity to tightly contact the limiting end face of the valve needle (341) with the bottom surface of the valve needle sleeve (343).

3. The electronic expansion valve according to claim 2, characterized in that: The upper end of the compression spring (344) is in compression contact with the lower end surface of the abutment platform (342), and the lower end of the compression spring (344) is in compression contact with the head of the valve needle (341) via the spring seat (345).

4. The electronic expansion valve according to claim 2, characterized in that: A guide post (331) is fixedly provided in the cavity of the limiting seat (33) for guiding the abutting platform (342) to move axially, and a guide through hole adapted to the guide post (331) is provided on the abutting platform (342).

5. The electronic expansion valve according to claim 2, characterized in that: The valve needle assembly (34) is further provided with a retaining ring (346) fixed integrally with the abutment platform (342) and / or the valve needle sleeve (343); the abutment platform (342) is T-shaped; the space formed by the circumference of the abutment platform (342) and the retaining ring (346) is a sealing ring groove (348), and the sealing ring groove (348) is used to accommodate an extruded sealing ring (347); a retaining ring (349) is provided between the extruded sealing ring (347) and the inner wall of the limiting seat (33) for accommodating the extruded sealing ring (347) in an extruded state in the sealing ring groove (348).

6. The electronic expansion valve according to claim 5, characterized in that: The inner ring of the retaining ring (349) is in the sealing ring groove (348), and the outer ring of the retaining ring (349) is in contact with the inner wall of the limiting seat (33).

7. The electronic expansion valve according to claim 1, characterized in that: The lower valve seat (21) is provided with a plurality of flow openings (212) for circulating gas in the circumferential direction; The valve body assembly (2) further comprises a valve body (22) and a valve housing (24); the valve body (22) is provided with an air flow channel 1 (221) for communicating with the flow port (212), an air flow channel 2 (222) for communicating with the valve port (211), an upper valve seat mounting cavity (223) for accommodating the upper valve seat (23), and a lower valve seat accommodating cavity (224) for accommodating the lower valve seat (21); the valve housing (24) is fixedly connected to the upper valve seat (23).

8. The electronic expansion valve according to claim 7, characterized in that: The limit seat (33) is supported by the upper valve seat (23) and is fixedly connected to the upper valve seat (23) by welding.

9. The electronic expansion valve according to claim 7, characterized in that: The fixed connection between the upper valve seat (23) and the valve body (22) is achieved by a fixing ring (25) threadedly connected to the valve body (22).

10. The electronic expansion valve according to claim 1, characterized in that: The rotor assembly (1) further includes a guide rail spring (11) sleeved on the rotating shaft (31) and fixedly connected to the limit seat (33), and a stop ring (12) is wound on the guide rail spring (11); the head of the rotating shaft (31) is fixedly connected to the rotor (14) via the rotor fixing plate (13); and a stop rod (15) for pushing the stop ring (12) is also fixedly provided on the rotor fixing plate (13).

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