Electric valve and refrigeration equipment
By combining the rubber sealing part with the valve core through vulcanization molding, the problems of increased cost and difficulty in automation of traditional O-ring sealing structures are solved, achieving efficient and reliable sealing performance and simplifying the production process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG MEIZHI COMPRESSOR
- Filing Date
- 2025-05-27
- Publication Date
- 2026-04-28
AI Technical Summary
In traditional electronic expansion valves, the O-ring sealing structure increases production costs and complexity, and is difficult to automate, thus affecting production efficiency.
The rubber sealing part is combined with the valve core through vulcanization molding, eliminating the need for the traditional sealing groove design, enhancing sealing performance and simplifying the assembly process.
It simplifies the manufacturing process, improves sealing performance and production efficiency, reduces costs, and enables automated assembly.
Smart Images
Figure CN224175391U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of refrigeration control technology, and in particular to an electric valve and a refrigeration device. Background Technology
[0002] In traditional electronic expansion valve designs, the sealing structure of the valve core assembly relies primarily on O-rings to achieve a seal at the valve port. This sealing method requires machining grooves of specific sizes and shapes into the valve head to accommodate the O-rings. This step not only increases machining operations and manufacturing costs but also demands higher precision. Furthermore, because O-rings are soft and easily deformed, they require careful handling during assembly to prevent damage or misalignment, making O-ring installation a complex and time-consuming process. Moreover, considering the precision requirements for O-ring assembly and their inherent physical properties, this process is difficult to automate efficiently, significantly limiting production efficiency. Utility Model Content
[0003] The main purpose of this utility model is to propose an electric valve and refrigeration equipment, aiming to provide a valve core that can simplify the manufacturing process and has good sealing performance, so as to improve the production efficiency of electric valves.
[0004] To achieve the above objectives, the electric valve proposed in this utility model includes:
[0005] The valve body has a valve cavity and a valve port communicating with the valve cavity;
[0006] The rotor assembly includes a rotor rotatably mounted within the valve chamber and a lead screw fixedly connected to the rotor; and
[0007] A nut assembly includes a nut and a valve core connected to one end of the nut. The other end of the nut is threaded into a lead screw. When the lead screw rotates, the nut can drive the valve core to move in the direction of approaching and moving away from the valve port along its axial direction to open and close the valve port.
[0008] The valve core has a rubber sealing part at one end facing the valve port. The rubber sealing part is vulcanized and formed, and it abuts against the periphery of the valve port to seal the valve port.
[0009] In one embodiment, the valve core is recessed with a sealing groove, and the rubber sealing part is disposed within the sealing groove.
[0010] In one embodiment, at least a portion of the surface of the valve core corresponding to the rubber seal is configured with a textured surface.
[0011] In one embodiment, an adhesive layer is further provided between the valve core and the rubber seal.
[0012] In one embodiment, the thickness of the rubber seal is set to d, where 0.2 mm ≤ d ≤ 1.0 mm.
[0013] In one embodiment, the material of the rubber seal comprises 10% to 30% by mass of fiber, including glass fiber or carbon fiber.
[0014] In one embodiment, the bonding force between the rubber seal and the valve core is set to be greater than or equal to 20N.
[0015] In one embodiment, the valve core has a recessed receiving groove at the end opposite to the valve port;
[0016] The nut assembly also includes:
[0017] A pressure plate is provided on the opening of the receiving groove. The pressure plate has a through hole communicating with the receiving groove. The nut passes through the through hole. A stop protrusion is provided on the outer side wall of the nut at one end inside the receiving groove, and the stop protrusion is used to limit the axial movement of the nut; and...
[0018] A spring is disposed within the receiving groove and located at the end of the nut near the valve port. The spring is used to provide a counterforce when the nut moves toward the valve port.
[0019] In one embodiment, the bottom of the receiving groove is further provided with a vent hole communicating with the valve cavity;
[0020] The nut and the pressure plate are spaced apart radially to define a communication channel between the nut and the pressure plate that connects the through hole and the receiving groove.
[0021] This utility model also provides a refrigeration device, the refrigeration device including an electric valve, the electric valve comprising:
[0022] The valve body has a valve cavity and a valve port communicating with the valve cavity;
[0023] The rotor assembly includes a rotor rotatably mounted within the valve chamber and a lead screw fixedly connected to the rotor; and
[0024] A nut assembly includes a nut and a valve core connected to one end of the nut. The other end of the nut is threaded into a lead screw. When the lead screw rotates, the nut can drive the valve core to move in the direction of approaching and moving away from the valve port along its axial direction to open and close the valve port.
[0025] The valve core has a rubber sealing part at one end facing the valve port. The rubber sealing part is vulcanized and formed, and it abuts against the periphery of the valve port to seal the valve port.
[0026] In one embodiment, the refrigeration equipment includes an air conditioner.
[0027] In the technical solution of this utility model, the rubber sealing part is directly vulcanized and molded onto the end of the valve core, eliminating the design and assembly steps of the traditional sealing groove. At the same time, it avoids the problem of medium leakage caused by poor fit between the sealing ring and the groove, ensuring that the bonding strength between the sealing part and the valve core meets the actual working conditions. This integrated sealing structure design not only simplifies the assembly process and reduces production costs, but also facilitates automated assembly and improves production efficiency. Attached Figure Description
[0028] 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.
[0029] Figure 1 A schematic diagram of an embodiment of the electric valve provided by this utility model;
[0030] Figure 2 for Figure 1 Cross-sectional schematic diagram of the nut assembly;
[0031] Figure 3 A schematic diagram of another embodiment of the electric valve provided by this utility model;
[0032] Figure 4 for Figure 3 Cross-sectional view of the nut assembly.
[0033] Explanation of icon numbers:
[0034] 100. Electric valve; 1. Valve body; a. Valve cavity; b. Valve port; 20. Rotor assembly; 21. Rotor; 22. Lead screw; 30. Nut assembly; 31. Nut; 311. Stop protrusion; 32. Valve core; 32a. Sealing groove; 32b. Receiving groove; 32c. Vent hole; 33. Rubber sealing part; 34. Pressure plate; 34a. Through hole; 35. Spring.
[0035] 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
[0036] 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.
[0037] 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.
[0038] 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.
[0039] In traditional electronic expansion valve designs, the sealing structure of the valve core assembly relies primarily on O-rings to achieve a seal at the valve port. This sealing method requires machining grooves of specific sizes and shapes into the valve head to accommodate the O-rings. This step not only increases machining operations and manufacturing costs but also demands higher precision. Furthermore, because O-rings are soft and easily deformed, they require careful handling during assembly to prevent damage or misalignment, making O-ring installation a complex and time-consuming process. Moreover, considering the precision requirements for O-ring assembly and their inherent physical properties, this process is difficult to automate efficiently, significantly limiting production efficiency.
[0040] This utility model proposes an electric valve 100, which aims to provide a valve core that simplifies the manufacturing process and has good sealing performance, thereby improving the production efficiency of electric valves.
[0041] Please see Figure 1 and Figure 2 In one embodiment of this utility model, the electric valve 100 includes a valve body 1, a rotor assembly 20, and a nut assembly 30. The valve body 1 has a valve cavity a and a valve port b communicating with the valve cavity a. The rotor assembly 20 includes a rotor 21 rotatably mounted in the valve cavity a and a lead screw 22 fixedly connected to the rotor 21. The nut assembly 30 includes a nut 31 and a valve core 32 connected to one end of the nut 31. The other end of the nut 31 is threadedly engaged with the lead screw 22. When the lead screw 22 rotates, the nut 31 can drive the valve core 32 to move in the direction of approaching and moving away from the valve port b along its axial direction to open and close the valve port b. The valve core 32 is provided with a rubber sealing part 33 at the end facing the valve port b. The rubber sealing part 33 is vulcanized and abuts against the periphery of the valve port b to seal the valve port b.
[0042] The electric valve 100 mainly includes a valve body 1, a rotor assembly 20, and a nut assembly 30. The valve body 1 has a valve cavity a and a valve port b communicating with the valve cavity a. The rotor assembly 20 includes a rotor 21 disposed within the valve cavity a and a lead screw 22 fixedly connected to the rotor 21; the rotor 21 can rotate around its axis. The nut assembly 30 consists of a nut 31 and a valve core 32. The valve core 32 is fixedly connected to one end of the nut 31, while the other end of the nut 31 is threadedly engaged with the lead screw 22. When the rotor 21 drives the lead screw 22 to rotate, the threaded transmission causes the nut 31 to move axially along the lead screw 22, thereby causing the valve core 32 to move towards or away from the valve port b, thus opening and closing the valve port b. To improve sealing performance, the end of the valve core 32 facing the valve port b is provided with a rubber sealing part 33, which is directly fixed to the end surface of the valve core 32 by vulcanization molding.
[0043] It should be noted that in existing technologies, O-rings are typically installed on the valve core 32 or valve seat to achieve a sealing function. However, this method requires machining a sealing groove on the metal part to accommodate the O-ring, which not only increases manufacturing difficulty but also, due to machining errors and assembly precision limitations, often results in a gap between the O-ring and the sealing groove 32a, becoming a potential leakage channel and affecting sealing reliability. Furthermore, the O-ring may deform, age, or shift during long-term use, further reducing the sealing effect.
[0044] In contrast, this invention directly vulcanizes the rubber sealing part 33 onto the end of the valve core 32, eliminating the design and assembly steps of the traditional sealing groove 32a, and avoiding media leakage caused by poor fit between the sealing ring and the groove. Vulcanization is a process that places rubber material under high temperature and high pressure to tightly bond it with a metal matrix. Through the dual effects of physical adsorption and chemical bonding, a strong integral structure is formed between the rubber and the metal, which not only improves the adhesion of the rubber sealing part 33, but also enhances its pressure resistance, tear resistance, and service life.
[0045] It should be noted that the valve core 32 body is preferably made of a metal material, such as stainless steel or copper alloy, which has good mechanical strength, wear resistance, and thermal stability, and can withstand high working pressure and frequent opening and closing actions. Rubber vulcanization molding on this basis ensures that the bonding strength between the sealing part and the valve core 32 meets the requirements of actual working conditions. This integrated sealing structure design not only simplifies the assembly process and reduces production costs, but also facilitates automated assembly and improves production efficiency.
[0046] Furthermore, to further improve the structural compatibility and sealing stability between the valve core 32 and the rubber seal 33, please refer to [link / reference needed]. Figure 3 and Figure 4 In another embodiment, the valve core 32 is recessed with a sealing groove 32a, and the rubber sealing part 33 is disposed in the sealing groove 32a.
[0047] It should be noted that the sealing groove 32a is preferably an annular groove structure, the shape and size of which match the rubber sealing part 33. The rubber sealing part 33 is disposed within the sealing groove 32a and forms a firm bond with the valve core 32 through a vulcanization molding process. This not only retains the good sealing performance and bonding strength brought about by vulcanization molding, but also provides additional limiting and support for the rubber sealing part 33 through the sealing groove 32a, enabling it to remain more stably in the set position during the movement of the valve core 32, avoiding sealing failure caused by pressure deformation or displacement. Simultaneously, the presence of the sealing groove 32a also helps to effectively guide the flow of rubber material during vulcanization, improving molding accuracy and consistency.
[0048] Compared with existing technologies, this structure retains the positioning function of the traditional sealing groove 32a, and by directly vulcanizing the rubber sealing part 33 into the groove, it overcomes the leakage risk caused by assembly errors, aging of the sealing ring, or uneven compression deformation in the traditional O-ring sealing method, and significantly improves the sealing reliability.
[0049] Furthermore, since the rubber sealing part 33 is pre-placed in the sealing groove 32a before vulcanization, the rubber material will fully fill the groove outline and tightly bond with the metal substrate during the vulcanization process, thereby further enhancing the structural integrity and shear resistance of the sealing part.
[0050] Furthermore, to enhance the bonding strength and sealing reliability between the valve core 32 and the rubber seal 33, in some other embodiments, at least a portion of the surface of the valve core 32 corresponding to the rubber seal 33 is provided with a concave-convex structure.
[0051] It should be noted that the uneven structure can take many forms, such as, but not limited to, stripes, knurling, dot matrix protrusions or pits formed by machining, or rough surface structures formed by processes such as sandblasting and etching, to increase the contact area between the rubber sealing part 33 and the valve core 32 substrate during the vulcanization process, and to provide a better mechanical anchoring effect through the surface microstructure, thereby significantly improving the adhesion between rubber and metal.
[0052] In actual manufacturing, when the rubber material is vulcanized under high temperature and high pressure, it fully flows into and fills these uneven structures. After cooling and solidification, it forms an interface structure similar to an "embedded" connection, making the rubber sealing part 33 and the valve core 32 tightly bonded and preventing relative slippage or peeling. Compared with the traditional vulcanization method on smooth metal surfaces, this structure can effectively improve the interface bonding strength and reduce the risk of sealing layer detachment or local failure caused by external forces.
[0053] To further enhance the bonding strength between the rubber seal 33 and the valve core 32, in this embodiment, an adhesive layer is also provided between the valve core 32 and the rubber seal 33.
[0054] It should be noted that the adhesive layer is located between the two and participates in interfacial bonding during the vulcanization process, thereby enhancing the adhesion between the metal and the rubber. The adhesive layer can be made of metal surface treatment materials suitable for vulcanization processes, such as epoxy resins, phenolic resins, isocyanates, or chlorinated rubber adhesives. Alternatively, commercially available adhesives specifically designed for rubber-metal bonding can be used, enabling a cross-linking reaction with the rubber during high-temperature vulcanization and simultaneously forming a strong interfacial bond with the metal surface. This significantly improves the adhesion between the rubber seal 33 and the valve core 32 after vulcanization.
[0055] Specifically, in this embodiment, the thickness of the rubber sealing part 33 is set to d, where 0.2mm≤d≤1.0mm.
[0056] Thus, by setting the thickness of the rubber sealing part 33 within the above range, it is ensured that the rubber sealing part 33 has sufficient elasticity and deformation capacity to achieve efficient sealing, while avoiding problems such as slow response or material waste caused by excessive thickness.
[0057] When the thickness of the rubber seal 33 is less than 0.2 mm, its physical strength and wear resistance may be significantly reduced, making it difficult to withstand wear and pressure changes during long-term use, which may lead to premature failure.
[0058] If the thickness exceeds 1.0mm, it will not only increase the manufacturing cost, but may also cause the valve to respond slowly when closed due to the elastic hysteresis characteristics of the rubber material itself, and may cause insufficient rebound under high pressure differential conditions, affecting the sealing effect.
[0059] To improve the mechanical strength, wear resistance, and high temperature resistance of the rubber sealing part 33, in this embodiment, the material of the rubber sealing part 33 includes 10% to 30% by mass of fiber, including glass fiber or carbon fiber.
[0060] It should be noted that after the fibers are uniformly dispersed in the rubber matrix, they undergo a synergistic curing reaction with the rubber through a vulcanization process, forming a composite sealing material with excellent mechanical properties and structural stability. Among them, glass fiber has good heat resistance and chemical inertness, which can effectively improve the dimensional stability of the rubber sealing part 33 in high-temperature environments; while carbon fiber has higher tensile strength and thermal conductivity, which helps to improve the fatigue durability and heat dissipation ability of the sealing part during frequent opening and closing processes.
[0061] Adding fibers to the formulation of the rubber seal 33 can significantly improve the overall strength of the material without significantly affecting its elasticity and sealing performance. It can also, to some extent, suppress permanent deformation of the rubber under high pressure or prolonged compression. Especially when the fiber content is controlled within the preferred range of 10% to 30%, a good balance can be achieved between the reinforcing effect and processing flowability, ensuring that the rubber maintains good filling properties and molding accuracy during vulcanization, preventing flow difficulties or localized insufficient rubber due to excessive fibers. Furthermore, the addition of fibers can enhance the interfacial bonding between the rubber seal 33 and the valve core 32, making it less prone to tearing or peeling failure during long-term use.
[0062] Specifically, in this embodiment, the bonding force between the rubber sealing part 33 and the valve core 32 is set to be greater than or equal to 20N.
[0063] It should be noted that the bonding force refers to the peeling force applied in the direction perpendicular to the interface between the rubber seal 33 and the valve core 32 under standard test conditions. Its value is achieved through comprehensive control of vulcanization molding process parameters, material selection, and surface treatment methods.
[0064] When the bonding force is less than 20N, the rubber seal 33 may partially detach or peel off completely during use due to factors such as fluid impact, mechanical vibration or temperature cycling, which may lead to seal failure. However, by controlling the bonding force above this threshold, the reliability of the sealing structure can be significantly improved, the service life of the electric valve 100 can be extended, and the maintenance frequency caused by seal damage can be reduced.
[0065] Further, in this embodiment, the valve core 32 is recessed at one end away from the valve port b, forming a receiving groove 32b; the nut assembly 30 also includes a pressure plate 34 and a spring 35. The pressure plate 34 covers the opening of the receiving groove 32b, and the pressure plate 34 is provided with a through hole 34a communicating with the receiving groove 32b. The nut 31 passes through the through hole 34a, and a stop protrusion 311 protrudes from the outer side wall of the nut 31 located inside the receiving groove 32b. The stop protrusion 311 is used to limit the axial movement of the nut 31; the spring 35 is located inside the receiving groove 32b and at the end of the nut 31 near the valve port b. The spring 35 is used to provide a reverse force when the nut 31 moves towards the valve port b.
[0066] Understandably, a receiving groove 32b is recessed at the end of the valve core 32 opposite to the nut 31, and a through hole 34a is formed through the bottom of the receiving groove 32b for the nut 31 to pass through. After the nut 31 passes through the through hole 34a, a limiting protrusion is provided on the outer wall of the end of the nut 31 located in the receiving groove 32b. This limiting protrusion limits the axial movement range of the nut 31 on the valve core 32 on the one hand, and allows the nut 31 to undergo axial displacement relative to the valve core 32 within a certain range on the other hand.
[0067] In addition, the valve core 32 assembly also includes a spring 35 and a limiting sleeve. The spring 35 is disposed between the limiting sleeve and the nut 31 and is located inside the receiving groove 32b. When the nut 31 drives the valve core 32 to move toward the valve port b and completes the closing action, the spring 35 is compressed to store elastic potential energy and applies a force to the nut 31 that is always toward the valve port b, so that the valve core 32 can fit more tightly against the periphery of the valve port b and improve the sealing performance.
[0068] This structural design is particularly suitable for applications of the electric valve 100 in high-temperature environments. In the prior art, when the electric valve 100 is in the closed state and experiences a high-temperature environment, the valve port b (usually made of plastic material) may expand due to heat and push the valve core 32 assembly upward, causing a small gap to appear in the originally closed valve port b. After the temperature returns to normal, the valve port b material shrinks, but at this time, due to the gap between the threaded pair between the lead screw 22 and the nut 31, the valve core 32 assembly may not be able to automatically return to the initial closed position, causing problems such as poor sealing or even leakage.
[0069] In this invention, since the spring 35 is always in a compressed state during the closing process of the valve core 32 assembly, it can provide continuous preload under any temperature change conditions. This not only helps to enhance the sealing pressure between the valve core 32 and the valve port b under normal conditions, but also automatically compensates for the displacement deviation caused by the threaded pair clearance through the elastic restoring force of the spring 35 after high temperature retraction, so that the valve core 32 always maintains good contact with the periphery of the valve port b, ensuring stable and reliable sealing performance.
[0070] In order to ensure that the valve core 32 is subjected to balanced pressure during its active stroke and can work stably, in this embodiment, the bottom of the receiving groove 32b is also provided with a vent hole 32c that communicates with the valve cavity a; the nut 31 and the pressure plate 34 are arranged radially apart to define a communication channel between the nut 31 and the pressure plate 34 that connects the through hole 34a and the receiving groove 32b.
[0071] Understandably, this connecting channel connects the through hole 34a on the pressure plate 34 with the internal space of the receiving groove 32b, and ultimately forms a gas flow path between the receiving groove 32b and the valve chamber a through the vent hole 32c. The purpose of this structural design is to ensure that the air pressure above the valve core 32 (i.e., the receiving groove 32b and the space connected to it) and below the valve core 32 (i.e., the valve chamber a) remains consistent, avoiding additional resistance or disturbance to the axial movement of the valve core 32 due to the existence of air pressure difference.
[0072] In actual operation, when the valve core 32 moves with the nut 31 to open or close, a difference in air pressure between its upper and lower sides may cause the valve core 32 to be subjected to uneven air pressure forces, thus affecting its smoothness of movement and even causing problems such as jamming and response delay. By setting the vent 32c and the connecting channel, the gas in the upper and lower spaces of the valve core 32 can be quickly balanced, effectively eliminating the interference factors caused by air pressure differences and ensuring the stability and sensitivity of the valve core 32 throughout its entire stroke. In addition, this pressure balancing mechanism also helps to reduce the load fluctuation of drive components (such as the motor and lead screw 22), improving the overall control accuracy and reliability of the electric valve 100.
[0073] This utility model also proposes a refrigeration device, which can be an air conditioner or a refrigerator, etc. The refrigeration device includes a heat exchanger and an electric valve 100. The specific structure of the electric valve 100 is as described in the above embodiments. Since this 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.
[0074] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope 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 patent protection scope of the present utility model.
Claims
1. An electric valve, characterized in that, include: The valve body has a valve cavity and a valve port communicating with the valve cavity; The rotor assembly includes a rotor rotatably mounted inside the valve chamber and a lead screw fixedly connected to the rotor; as well as, A nut assembly includes a nut and a valve core connected to one end of the nut. The other end of the nut is threaded into a lead screw. When the lead screw rotates, the nut can drive the valve core to move in the direction of approaching and moving away from the valve port along its axial direction to open and close the valve port. The valve core has a rubber sealing part at one end facing the valve port. The rubber sealing part is vulcanized and formed, and it abuts against the periphery of the valve port to seal the valve port.
2. The electric valve as described in claim 1, characterized in that, The valve core is recessed with a sealing groove, and the rubber sealing part is disposed in the sealing groove.
3. The electric valve as described in claim 1, characterized in that, At least a portion of the surface of the valve core corresponding to the rubber seal is configured with a concave-convex structure.
4. The electric valve as described in claim 1, characterized in that, An adhesive layer is also provided between the valve core and the rubber sealing part.
5. The electric valve as described in claim 1, characterized in that, The thickness of the rubber seal is set to d, where 0.2mm≤d≤1.0mm.
6. The electric valve as described in claim 1, characterized in that, The material of the rubber seal includes 10% to 30% fiber by mass, including glass fiber or carbon fiber.
7. The electric valve as described in claim 1, characterized in that, The bonding force between the rubber seal and the valve core is set to be greater than or equal to 20N.
8. The electric valve as described in claim 1, characterized in that, The valve core has a recessed receiving groove at the end opposite to the valve port; The nut assembly also includes: A pressure plate is provided on the opening of the receiving groove. The pressure plate has a through hole communicating with the receiving groove. The nut passes through the through hole. A stop protrusion is provided on the outer side wall of the nut at one end inside the receiving groove. The stop protrusion is used to limit the axial movement of the nut; and... A spring is disposed within the receiving groove and located at the end of the nut near the valve port. The spring is used to provide a counterforce when the nut moves toward the valve port.
9. The electric valve as described in claim 8, characterized in that, The bottom of the receiving groove is also provided with a vent hole that communicates with the valve cavity; The nut and the pressure plate are spaced apart radially to define a communication channel between the nut and the pressure plate that connects the through hole and the receiving groove.
10. A refrigeration device, characterized in that, Includes the electric valve as described in any one of claims 1 to 9.
11. The refrigeration equipment as described in claim 10, characterized in that, The refrigeration equipment includes an air conditioner.