Electronic expansion valves and refrigeration equipment

Abstract

This utility model discloses an electronic expansion valve and a refrigeration device, relating to the field of refrigeration equipment technology. The electronic expansion valve includes a valve seat, a rotor assembly, and a valve core. The valve seat has a valve cavity and a valve port. The rotor assembly is rotatably disposed within the valve cavity. The rotor assembly includes a magnetic rotor, a limiting plate, a screw, a nut, and a pressure sleeve. The limiting plate is fixedly connected to the magnetic rotor. The screw passes through the limiting plate, and rotation of the limiting plate drives the screw to rotate, thereby causing the nut to move along the screw. The pressure sleeve is fitted onto the screw. The valve core is located within the valve cavity and connected to the nut. The screw has a first step for the limiting plate to fit onto and a second step adjacent to the first step. The diameter of the second step is larger than the diameter of the first step. The limiting plate is located between the pressure sleeve and the second step. The pressure sleeve and the first step are used to axially limit the limiting plate. The technical solution provided by this utility model improves the mechanical strength of the connection between the screw and the limiting plate, ensuring the normal operation of the electronic expansion valve.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration equipment technology, and in particular to an electronic expansion valve and a refrigeration equipment using the electronic expansion valve. Background Technology

[0002] In the field of refrigeration and air conditioning technology, electronic expansion valves are key components, and the application of large-diameter electronic expansion valves is becoming increasingly widespread. In existing large-diameter electronic expansion valves, the rotor limiting plate is usually made of powder metallurgy and fixed to the screw by laser welding. However, this traditional connection method has some drawbacks.

[0003] During powder metallurgy laser welding, severe slag spatter not only contaminates surrounding components but also easily leads to problems such as incomplete or broken welds. Incomplete or broken welds can weaken the connection between the rotor limit plate and the screw. During long-term operation of the electronic expansion valve, factors such as vibration and impact may cause the connection to loosen, affecting the normal operation of the electronic expansion valve. This results in decreased movement accuracy of the valve core assembly, making it impossible to accurately control the opening and closing degree of the valve port, ultimately affecting the performance and stability of the refrigeration system. Utility Model Content

[0004] This utility model proposes an electronic expansion valve and a refrigeration device, aiming to improve the mechanical strength of the connection between the screw and the limiting plate, and ensure the normal operation of the electronic expansion valve.

[0005] To achieve the above objectives, the electronic expansion valve proposed in this utility model includes:

[0006] A valve seat having a valve cavity and a valve port communicating with the valve cavity;

[0007] A rotor assembly is rotatably disposed within the valve cavity. The rotor assembly includes a magnetic rotor, a limiting plate, a screw, a nut, and a pressure sleeve. The nut is threadedly engaged with the screw. The limiting plate is fixedly connected to the magnetic rotor. The screw passes through the limiting plate. The rotation of the limiting plate drives the screw to rotate, thereby driving the nut to move along the screw. The pressure sleeve is fitted onto the screw.

[0008] A valve core, located within the valve cavity and connected to the nut;

[0009] The screw has a first step for the limiting plate to be fitted and a second step adjacent to the first step. The diameter of the second step is larger than the diameter of the first step. The limiting plate is located between the pressure sleeve and the second step. The pressure sleeve and the first step are used to axially limit the limiting plate.

[0010] In one embodiment, the screw further has a third step for the pressure sleeve to be fitted, the diameter of the third step being smaller than the diameter of the first step; the end face of the pressure sleeve abuts against the first step.

[0011] In one embodiment, the length of the limiting plate is less than the length of the first step.

[0012] In one embodiment, the second step is D-shaped, and the limiting plate has a D-shaped hole adapted to the second step.

[0013] In one embodiment, the limiting plate includes an integrally formed main body plate and a protruding post protruding from the main body plate toward the pressure sleeve, wherein a magnetic rotor is embedded in the edge of the main body plate; the diameter of the protruding post is smaller than the diameter of the main body plate; and the diameter of the pressure sleeve is smaller than the diameter of the protruding post.

[0014] In one embodiment, a spring is also provided between the pressure sleeve and the limiting plate.

[0015] In one embodiment, the pressure sleeve and the screw are connected by welding.

[0016] In one embodiment, the limiting plate is made of metal or plastic material.

[0017] In one embodiment, the limiting plate and the magnetic rotor are integrally injection molded.

[0018] This utility model also proposes a refrigeration device, which includes the above-mentioned electronic expansion valve.

[0019] The technical solution of this utility model uses a second stage of pressure sleeve and screw to axially limit the limiting plate, thereby improving the mechanical strength of the connection between the limiting plate and the screw and ensuring the normal operation of the electronic expansion valve. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 A schematic diagram of an embodiment of the electronic expansion valve provided by this utility model;

[0022] Figure 2 A schematic diagram of the screw structure of an embodiment of the electronic expansion valve provided by this utility model;

[0023] Figure 3A partial structural schematic diagram of an embodiment of the electronic expansion valve provided by this utility model;

[0024] Figure 4 A partial structural schematic diagram of another embodiment of the electronic expansion valve provided by this utility model.

[0025] Explanation of icon numbers:

[0026] 10. Valve seat; 11. Valve cavity; 20. Rotor assembly; 21. Magnetic rotor; 22. Limiting plate; 221. Main plate; 222. Protruding column; 23. Screw; 231. First stage; 232. Second stage; 233. Third stage; 234. Fourth stage; 235. Fifth stage; 24. Nut; 25. Pressure sleeve; 26. Bearing; 30. Spring.

[0027] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0029] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0030] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0031] Traditional electric expansion valves use rotor limit plates made of powder metallurgy material. During the welding process with the screw, severe slag spatter occurs, easily leading to problems such as incomplete welds and broken welds. Incomplete welds and broken welds result in insufficient connection strength between the rotor limit plate and the screw. During long-term operation of the electronic expansion valve, factors such as vibration and impact may cause the connection to loosen, thus affecting the normal operation of the electronic expansion valve.

[0032] Therefore, this utility model proposes an electronic expansion valve.

[0033] Please see Figures 1 to 3 As shown, in one embodiment of this utility model, the electronic expansion valve includes a valve seat 10, a rotor assembly 20, and a valve core (not shown in the figure). The valve seat 10 has a valve cavity 11 and a valve port, with the valve port communicating with the valve cavity 11. The rotor assembly 20 is rotatably disposed within the valve cavity 11, and includes a magnetic rotor 21, a limiting plate 22, a screw 23, a nut 24, and a pressure sleeve 25. The nut 24 is threadedly engaged with the screw 23. The limiting plate 22 is fixedly connected to the magnetic rotor 21, and the screw 23 passes through the limiting plate 22. The rotation of the limiting plate 22 drives the screw 23 to rotate, thereby driving the nut 24 to move along the screw 23. The pressure sleeve 25 is sleeved on the screw 23. The valve core is located within the valve cavity 11 and is fixedly connected to the nut 24 so that the valve core and the nut 24 move synchronously. The screw 23 has a first step 231 and a second step 232 arranged adjacent to each other, with the first step 231 used for the limiting plate 22 to be sleeved. The diameter of the second step 232 is larger than the diameter of the first step 231. The limiting plate 22 is located between the pressure sleeve 25 and the second step 232. The pressure sleeve 25 and the first step 231 are used to axially limit the limiting plate 22.

[0034] Specifically, the valve seat 10 serves as a basic support structure, internally containing an interconnected valve chamber 11 and a valve port, with the valve port located at the lower axial end of the valve seat 10. The valve chamber 11 provides space for moving parts such as the rotor assembly 20 and the valve core; the valve port serves as the refrigerant outlet, and its opening and closing state directly determines the flow rate of the refrigeration system. Furthermore, a coil assembly (not shown in the figure) is fitted around the valve seat 10, providing a magnetic field environment for the power transmission of the electronic expansion valve. The magnetic rotor 21 employs a cylindrical magnet structure, achieving its own rotation by receiving the alternating magnetic field generated by the coil assembly. It serves as a power source, providing initial driving force for the entire rotor assembly 20. The limiting plate 22 acts as a connection hub between the magnetic rotor 21 and the screw 23. On one hand, it is fixedly connected to the magnetic rotor 21, restricting its axial movement; on the other hand, it is fitted through a perforation into the first stage 231 of the screw 23, transmitting the torque of the magnetic rotor 21 to the screw 23. The screw 23 is a shaft-shaped component with external threads on its outer wall, consisting of a first stage 231 and a second stage 232 with different diameters. The second stage 232 has a larger diameter than the first stage 231. The second stage 232 is positioned adjacent to the first stage 231, thus forming an axial limiting surface on the end face of the second stage 232 closest to the first stage 231. The second stage 232 cooperates with the pressure sleeve 25 to limit the axial displacement of the limiting plate 22. The nut 24 has an internal thread that engages with the external thread on the screw 23. The nut 24 acts as the driven member of the screw 23, converting the rotational motion of the screw 23 into its own axial linear displacement. The valve core is located at the lower end of the nut 24 and is fixedly connected to it. The axial displacement of the nut 24 drives the valve core to move up and down, achieving the opening and closing action with the valve port of the valve seat 10, thereby controlling the refrigerant flow. The pressure sleeve 25 is fitted onto the screw 23. The pressure sleeve 25 and the second stage 232 of the screw 23 work together to bidirectionally limit the limiting plate 22 in the axial direction, ensuring the operational stability of the rotor assembly 20.

[0035] When the electronic expansion valve is running, the coil assembly generates an alternating magnetic field, driving the magnetic rotor 21 to rotate. The limiting plate 22 is fixedly connected to the magnetic rotor 21 to transmit torque to the limiting plate 22, and then to the screw 23. When the screw 23 rotates, the nut 24 moves axially along the screw 23 through threaded engagement, causing the valve core to rise and fall synchronously. The end face of the second stage 232 of the screw 23 forms an axial constraint with the pressure sleeve 25, limiting the displacement of the limiting plate 22 and ensuring the stable operation of the rotor assembly 20. The valve core moves with the nut 24, changing its relative position with the valve port to achieve precise adjustment of the valve port opening degree, thereby controlling the refrigerant flow rate.

[0036] In the market, the limiting plate 22 and the screw 23 are fixedly connected by welding. However, the limiting plate 22 is made of powder metallurgy material, which is prone to problems such as incomplete welding and weld breakage, which affects the connection strength between the limiting plate 22 and the screw 23. In the solution of this application, the traditional welding process is abandoned between the limiting plate 22 and the screw 23. The limiting plate 22 is limited axially by the screw 23 itself and the pressure sleeve 25, avoiding the risk of incomplete welding and enhancing the stability of the component connection. In this solution, the material of the limiting plate 22 can be replaced with other materials with higher mechanical strength, such as plastic materials, thereby reducing costs.

[0037] Furthermore, the screw 23 also has a third step 233 for fitting the pressure sleeve 25, the third step 233 being disposed adjacent to the first step 231. The diameter of the third step 233 is smaller than the diameter of the first step 231, and the pressure sleeve 25 abuts against the first step 231.

[0038] Specifically, the upper end of the screw 23 has a third step 233, on which the pressure sleeve 25 is fitted. The third step 233 is adjacent to the first step 231, and the first step 231 is located below the third step 233, while the second step 232 is located below the third step 233. The diameter of the first step 231 is larger than that of the third step 233, so the end face of the first step 231 near the third step 233 forms a shoulder structure, which is used to position the pressure sleeve 25 and provide a precise axial reference for the installation of the pressure sleeve 25. The inner diameter of the pressure sleeve 25 is precisely matched with the third step 233 of the screw 23, ensuring good coaxiality between the two after fitting. During the assembly of the electronic expansion valve, the pressure sleeve 25 is fitted onto the third step 233 along the axial direction of the screw 23. As the pressure sleeve 25 moves down until its bottom is tightly abutting against the shoulder of the first step 231, the pressure sleeve 25 completes precise positioning. To ensure a stable connection between the pressure sleeve 25 and the screw 23 during operation and prevent relative displacement, a welding method is used to connect them. The welding process can be flexibly selected according to actual needs, using appropriate techniques such as laser welding or brazing, to form a stable integral structure between the pressure sleeve 25 and the screw 23. After fixing, the pressure sleeve 25 and the screw 23 work together to effectively limit the movement of the limiting plate 22 in the rotor assembly 20. The lower end face of the pressure sleeve 25 is tightly fitted with the end face of the first step 231 near the third step 233, providing a downward limiting force; while the second step 232 of the screw 23 has a larger diameter than the first step 231, and its end face forms an upward limiting surface, cooperating with the pressure sleeve 25 to form a bidirectional constraint on the limiting plate 22 in the axial direction. This design ensures that the limiting plate 22 can only perform precise rotational movements during the operation of the rotor assembly 20, effectively limiting its axial movement. Even when the electronic expansion valve is in long-term operation and faces complex working conditions such as vibration and impact, the stability and reliability of the rotor assembly 20 can be guaranteed. This ensures that the valve core can move up and down precisely as the nut 24 moves, accurately control the opening and closing degree of the valve port, and ensure the stable and efficient operation of the refrigeration system.

[0039] It should be noted that in this embodiment, the screw 23 further includes a fourth stage 234 and a fifth stage 235, with the diameter of the fourth stage 234 being larger than the diameter of the second stage 232. Specifically, the screw 23 includes a third stage 233, a first stage 231, a second stage 232, a fourth stage 234, and a fifth stage 235 connected sequentially from top to bottom. The diameter of the third stage 233 is smaller than the diameter of the first stage 231, the diameter of the first stage 231 is smaller than the diameter of the second stage 232, and the diameter of the second stage 232 is smaller than the diameter of the fourth stage 234. The second stage 232 is used to mount the bearing 26, and because the diameter of the fourth stage 234 is larger than that of the second stage 232, the end face of the fourth stage 234 can limit the bearing 26. The fifth stage 235 is located near the valve port and has threads.

[0040] like Figure 3 As shown, in some embodiments, there is a gap between the limiting plate 22 and the pressure sleeve 25, the gap being in the range of 0.01mm-0.1mm.

[0041] Specifically, if the limiting plate 22 and the pressure sleeve 25 are in direct contact, stress concentration can easily occur at the contact point when the electronic expansion valve is subjected to external forces such as vibration and impact, potentially leading to localized damage to the components. The gap buffers external forces, allowing stress to be evenly distributed throughout the connection structure of the screw 23, pressure sleeve 25, and limiting plate 22, enhancing the structural strength and fatigue resistance of the entire rotor assembly 20 and extending the service life of the electronic expansion valve under complex operating conditions. During operation, the rotor assembly 20 may experience slight axial displacement due to fluid pressure fluctuations and instantaneous impact forces generated during motor start / stop. This gap allows the limiting plate 22 to move freely within a certain range, compensating for these slight displacements and preventing component jamming or loosening due to restricted displacement, further ensuring the stability and reliability of the electronic expansion valve's operation.

[0042] In this embodiment, the gap between the limiting plate 22 and the pressure sleeve 25 is set at 0.01mm-0.1mm. If the gap is less than 0.01mm, due to the influence of machining tolerances and assembly errors, the limiting plate 22 and the pressure sleeve 25 may partially contact or jam, failing to achieve basic functions such as reducing friction and compensating for thermal expansion. 0.01mm as the lower limit ensures a physical distance between the two, avoiding rigid contact, and maintains relatively stable coaxiality during component movement, ensuring the normal operation of the rotor assembly 20. When the gap exceeds 0.1mm, although friction can be further reduced, it leads to an excessively large range of motion of the limiting plate 22 in the axial direction. During the operation of the electronic expansion valve, an excessively large gap can easily cause the limiting plate 22 to wobble uncontrollably under the action of external forces such as vibration and fluid pressure fluctuations, affecting the smoothness of the screw 23's rotation, and consequently reducing the displacement accuracy of the valve core driven by the nut 24, making it impossible to accurately control the valve opening. Furthermore, an excessively large gap may also cause collision noise between components, reducing the user experience and reliability of the product. Therefore, setting the gap to 0.01mm-0.1mm can reduce component wear, extend service life, maintain the stability of rotor assembly 20 operation, and ensure that the electronic expansion valve can maintain high-precision flow control performance during long-term high-frequency use.

[0043] Furthermore, the length of the limiting plate 22 is less than the length of the first step 231.

[0044] Specifically, in this embodiment, the limiting plate 22 is installed on the first step 231, and the length of the first step 231 is greater than that of the limiting plate 22; the pressure sleeve 25 is installed on the third step 233, and the diameter of the first step 231 is greater than that of the third step 233. Therefore, the pressure sleeve 25 abuts against the end face of the first step 231, and the pressure sleeve 25 can be positioned by the first step 231, which facilitates subsequent welding of the pressure sleeve 25. The gap between the pressure sleeve 25 and the limiting plate 22 can be controlled by the length of the first step 231 and the length of the limiting plate 22. Since the length of the first step 231 is greater than that of the limiting plate 22, the length difference between the two directly determines the axial distance between the pressure sleeve 25 and the limiting plate 22. In the actual assembly process, technicians can quickly and accurately control the gap between the two by adjusting the processing length of the first step 231 or selecting a limiting plate 22 of the corresponding size according to the preset gap size (e.g., 0.01mm-0.1mm). This gap adjustment method based on the screw 23 structure itself does not require additional adjustment parts or complex processes, effectively reducing production costs and assembly difficulty.

[0045] Furthermore, the first step 231 has a D-shape, and the limiting plate 22 has a D-shaped hole that is adapted to the second step 232.

[0046] Specifically, in this embodiment, the limiting plate 22 is fitted over the first step 231, and the first step 231 of the screw 23 adopts a D-shaped design, the cross-sectional profile of which is composed of a semicircle and a plane. This shape perfectly matches the D-shaped hole opened on the limiting plate 22. During assembly, the D-shaped hole of the limiting plate 22 is aligned with the first step 231 of the screw 23, so that the two shapes fit together, thereby achieving circumferential fixation between the limiting plate 22 and the screw 23. Compared with the traditional circular hole-shaft fit, this D-shaped mating structure can effectively prevent relative rotation between the limiting plate 22 and the screw 23, ensuring that the torque transmitted by the magnetic rotor 21 can drive the screw 23 to rotate without loss through the limiting plate 22. At the same time, the asymmetrical design of the D-shaped structure can also play a foolproof role, simplifying the assembly process and avoiding installation errors caused by incorrect orientation.

[0047] Furthermore, both the pressure sleeve 25 and the screw 23 are made of metal, and the two are made of the same material.

[0048] Specifically, in this embodiment, both the pressure sleeve 25 and the screw 23 are made of the same metal material (such as high-strength stainless steel). This design significantly improves connection reliability and process feasibility. The same metal material has similar coefficients of thermal expansion, melting points, and metallurgical properties, enabling more uniform heat conduction and metal fusion during welding, effectively reducing welding defects caused by differences in material properties. For example, in laser welding or brazing processes, using the same material avoids stress concentration caused by inconsistent thermal expansion, reducing the probability of defects such as incomplete welds and broken welds, and significantly improving the connection strength and stability between the pressure sleeve 25 and the screw 23. Furthermore, unified material selection simplifies raw material procurement and inventory management processes, reduces supply chain complexity, and further optimizes the manufacturing cost and production efficiency of the electronic expansion valve.

[0049] In an optional embodiment, the limiting plate 22 is made of a plastic material.

[0050] Specifically, the limiting plate 22 uses a plastic material (such as engineering plastic PA66 or POM) instead of traditional powder metallurgy materials. Plastic materials offer advantages such as low cost and simple molding processes; the limiting plate 22, meeting dimensional requirements, can be quickly produced through injection molding. Compared to the complex pressing and sintering processes of powder metallurgy, this significantly reduces material and processing costs. The low density of the plastic material reduces the overall weight of the rotor assembly 20, lowers operational inertia, and helps improve the response speed of the electronic expansion valve. Furthermore, its excellent insulation and corrosion resistance effectively prevent electrochemical corrosion with metal components, extending product lifespan. Overall, this solution significantly reduces the manufacturing cost of the electronic expansion valve while ensuring product performance, thus enhancing the product's market competitiveness. In other embodiments, the limiting plate 22 can also be made of metal.

[0051] In this embodiment, the limiting plate 22 includes a main plate 221 and a protruding post 222 protruding from the main plate 221 toward the pressure sleeve 25. The main plate 221 and the protruding post 222 are integrally formed. The edge of the main plate 221 is embedded in the magnetic rotor 21, and the diameter of the protruding post 222 is smaller than the diameter of the main plate 221. The diameter of the pressure sleeve 25 is smaller than the diameter of the protruding post 222. The protruding post 222 effectively increases the contact length between the main plate 221 and the screw 23. The larger contact area helps to disperse the stress during torque transmission, reduce local stress concentration, and thus improve the stability of torque transmission. Even under conditions of high-frequency operation of the electronic expansion valve and exposure to large vibrations or impacts, the extended connection length can ensure stable transmission between the limiting plate 22 and the screw 23. This design ensures the contact area between the limiting plate 22 and the screw 23 while reducing the weight of the limiting plate 22 and reducing material costs. Because the diameter of the pressure sleeve 25 is smaller than that of the protruding post 222, its overall volume is significantly reduced. During manufacturing, this results in a substantial decrease in the amount of raw materials used, such as stainless steel and copper alloys, as well as in energy consumption, cutting time, and equipment wear. Simultaneously, the limiting plate 22 uses a plastic material instead of traditional powder metallurgy materials. Leveraging the advantages of simple and low-cost injection molding, this further reduces material and processing costs. The combination of these two factors achieves dual cost optimization from the perspectives of key component material selection and structural design. This solution significantly reduces the overall manufacturing cost of the electronic expansion valve while ensuring product performance, thereby significantly enhancing the product's price competitiveness in the market.

[0052] In an optional embodiment, the limiting plate 22 and the magnetic rotor 21 are integrally injection molded.

[0053] Specifically, during production, the magnetic rotor 21 is first fabricated to ensure stable magnetism and structural strength. Then, the magnetic rotor 21 is placed as an insert into an injection mold using the same plastic material (such as PA66 or POM) as in the optional embodiments. The injection molding process encapsulates and tightly adheres the plastic material to the magnetic rotor 21, forming a complete assembly. This integrated design eliminates the connection process between the limiting plate 22 and the magnetic rotor 21 in traditional assembly, reducing power transmission losses caused by loose or misaligned connectors. It also simplifies the production process and reduces assembly costs and time. Furthermore, the tight bond between the injection molding material and the magnetic rotor 21 effectively protects the magnetic rotor 21 from external environmental corrosion, improving the overall protective performance of the component. The integrated structure also allows the magnetic rotor 21 to transmit torque more efficiently and stably to the limiting plate 22 when driven by the magnetic field of the receiving coil assembly, thereby driving the screw 23 to rotate and further improving the operational reliability and control accuracy of the electronic expansion valve.

[0054] Please see Figure 4In an optional embodiment, a spring 30 is provided between the pressure sleeve 25 and the limiting plate 22.

[0055] In this embodiment, a spring 30 structure is added between the pressure sleeve 25 and the limiting plate 22 to optimize the performance of the rotor assembly 20. The spring 30 is a cylindrical helical compression spring 30, with its inner diameter adapted to the outer diameter of the first stage 231 of the screw 23, and its outer diameter between the inner diameter of the pressure sleeve 25 and the outer diameter of the limiting plate 22, ensuring a tight fit between the pressure sleeve 25 and the limiting plate 22 after installation. The two ends of the spring 30 abut against the two opposing surfaces of the pressure sleeve 25 and the limiting plate 22, respectively. In its natural state, the spring 30 provides a certain preload, forming an elastic connection between the limiting plate 22 and the pressure sleeve 25. The elastic deformation of the spring 30 adaptively adjusts the axial clearance between the two, effectively compensating for dimensional differences caused by machining errors or assembly deviations. When the electronic expansion valve is running, the spring 30 can absorb and buffer energy under external forces such as vibration and impact, preventing rigid collisions between the limiting plate 22 and the pressure sleeve 25, significantly reducing component wear.

[0056] This utility model also proposes a refrigeration device, which includes the above-mentioned electronic expansion valve. The specific structure of the electronic expansion valve is as described in the above embodiments. Since the refrigeration device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0057] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. An electronic expansion valve for use in refrigeration equipment, characterized in that, include: A valve seat having a valve cavity and a valve port communicating with the valve cavity; A rotor assembly is rotatably disposed within the valve cavity. The rotor assembly includes a magnetic rotor, a limiting plate, a screw, a nut, and a pressure sleeve. The nut is threadedly engaged with the screw. The limiting plate is fixedly connected to the magnetic rotor. The screw passes through the limiting plate. The rotation of the limiting plate drives the screw to rotate, thereby driving the nut to move along the screw. The pressure sleeve is fitted onto the screw. A valve core, located within the valve cavity and connected to the nut; The screw has a first step for the limiting plate to be fitted and a second step adjacent to the first step. The diameter of the second step is larger than the diameter of the first step. The limiting plate is located between the pressure sleeve and the second step. The pressure sleeve and the first step are used to axially limit the limiting plate.

2. The electronic expansion valve as described in claim 1, characterized in that, The screw also has a third step for the pressure sleeve to be fitted, the diameter of the third step being smaller than the diameter of the first step; the end face of the pressure sleeve abuts against the first step.

3. The electronic expansion valve as described in claim 2, characterized in that, The length of the limiting plate is less than the length of the first step.

4. The electronic expansion valve as described in claim 3, characterized in that, The second step has a D-shape, and the limiting plate has a D-shaped hole that is adapted to the second step.

5. The electronic expansion valve as described in claim 4, characterized in that, The limiting plate includes an integrally formed main body plate and a protruding post protruding from the main body plate toward the pressure sleeve. A magnetic rotor is embedded in the edge of the main body plate. The diameter of the protruding post is smaller than the diameter of the main body plate. The diameter of the pressure sleeve is smaller than the diameter of the protruding post.

6. The electronic expansion valve as described in claim 2, characterized in that, A spring is also provided between the pressure sleeve and the limiting plate.

7. The electronic expansion valve as described in claim 5, characterized in that, Both the pressure sleeve and the screw are made of metal, and they are made of the same material.

8. The electronic expansion valve as described in claim 7, characterized in that, The pressure sleeve and the screw are connected by welding.

9. The electronic expansion valve as described in claim 1, characterized in that, The limiting plate is made of metal or plastic.

10. The electronic expansion valve as claimed in claim 1, characterized in that, The limiting plate and the magnetic rotor are integrally injection molded.

11. A refrigeration device, characterized in that, Includes the electronic expansion valve as described in any one of claims 1 to 10.

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