Electric valve and refrigeration equipment

Abstract

The utility model discloses an electrically operated valve and refrigeration equipment, and relates to the technical field of refrigeration control, the electrically operated valve comprises a valve body, a valve core assembly and a rotor assembly, the valve body comprises a valve seat, a guide seat and a bearing seat, and the valve seat and the guide seat are enclosed to form a valve cavity; the rotor assembly comprises a rotor, a bearing and a lead screw, the bearing sleeves the periphery of the lead screw and is mounted on the bearing seat, one end of the lead screw is fixedly connected to the rotor, and the other end of the lead screw is in threaded fit with the nut; wherein the guide seat and the bearing seat are welded, the guide seat and the bearing seat respectively adopt independent structural design, proper first section bars and second section bars can be selected according to respective size requirements during material selection, and the diameters and the heights of the first section bars and the second section bars are slightly larger than the size required by a final finished product, so that the cutting output is reduced, the machining efficiency is improved, and the loss of raw materials is reduced. After machining is completed, the guide seat and the bearing seat are connected into a whole through welding, the structural strength and the sealing performance are guaranteed, and the manufacturing cost is reduced.

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 valves, there is usually a multi-functional upper valve seat inside. The upper valve seat not only needs to connect and seal with the external lower valve seat or valve seat component, but also needs to provide guidance for the valve core component, while ensuring the accurate positioning and fixation of the lead screw bearing component.

[0003] Currently, these parts are mostly made of metal materials through machining, especially SUS304 stainless steel. Although this material has good mechanical properties and corrosion resistance, its high machining difficulty and the need for complex cutting processes result in high production costs, affecting the product's market competitiveness. Therefore, seeking more efficient and economical design and manufacturing solutions is key to enhancing the advantages of these products. Utility Model Content

[0004] The main purpose of this utility model is to propose an electric valve and refrigeration equipment, which aims to solve the problems of high difficulty in processing the upper valve seat and high production cost of existing electric valves.

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

[0006] The valve body includes a valve seat, a guide seat, and a bearing seat. The valve seat and the guide seat enclose a valve cavity. The valve seat is provided with a valve port communicating with the valve cavity. The guide seat has a guide hole along its axial direction. The bearing seat is installed at the end of the connecting hole away from the valve port. The bearing seat is provided with a mounting hole extending along its axial direction, and the mounting hole communicates with the guide hole.

[0007] A valve core assembly includes a nut and a valve core connected to one end of the nut, the valve core being movably mounted in the guide hole along the depth direction of the guide hole, and the other end of the nut extending into the mounting hole;

[0008] The rotor assembly includes a rotor, a bearing, and a lead screw. The bearing is sleeved around the lead screw and mounted on the bearing housing. One end of the lead screw is connected to the rotor, and the other end extends into the mounting hole to engage with the nut threadedly.

[0009] The guide seat and the bearing seat are welded together.

[0010] In one embodiment, the guide seat and the bearing seat are connected by brazing or laser welding.

[0011] In one embodiment, the bearing housing includes a main body segment and a connecting segment sequentially arranged in a direction close to the guide seat. The outer diameter of the connecting segment is set to be smaller than the outer diameter of the main body segment, so as to form a first annular stepped surface facing the guide seat at the connection between the connecting segment and the main body segment.

[0012] The guide hole is configured as a stepped hole, having a second annular stepped surface facing the bearing seat; the connecting section passes through the guide hole, and the first annular stepped surface is supported on the second annular stepped surface; or...

[0013] The connecting section passes through the guide hole, and the first annular stepped surface is supported at the upper edge of the guide hole.

[0014] In one embodiment, the main body segment has a first main body segment located within the guide hole, and the first main body segment and the guide hole are clearance-fitted.

[0015] In one embodiment, the connecting segment includes a main mating segment and a guide segment arranged sequentially in the direction close to the second annular step surface, wherein the outer diameter of the guide segment is set to be smaller than that of the main mating segment.

[0016] In one embodiment, the outer diameter of the main body mating section is D1, and the outer diameter of the guide section is D2, where 0.03mm ≤ D1 - D2 ≤ 0.08mm.

[0017] In one embodiment, the main body mating section is interference-fitted with the guide hole.

[0018] In one embodiment, the interference fit between the main body mating section and the guide hole is set to δd, where 0.01mm≤δd≤0.04mm.

[0019] In one embodiment, the guide seat has a recessed groove on its end face facing the bearing seat, and the bottom of the groove has a guide hole through it. The bearing seat passes through the guide hole to define an annular material groove for accommodating the welding ring between the inner wall of the groove and the outer wall of the bearing seat.

[0020] In one embodiment, the guide seat is made of stainless steel; and / or,

[0021] The bearing housing is made of stainless steel.

[0022] In one embodiment, the guide seat is made of SUS304 or SUS303Cu.

[0023] In one embodiment, the valve core is recessed at the end opposite to the nut, and a through hole is provided at the bottom of the recess.

[0024] The nut passes through the through hole, and a stop protrusion is provided on the outer side wall of one end of the nut located in the receiving groove. The stop protrusion is used to limit the axial movement of the nut and is movably disposed relative to the valve core.

[0025] The valve core assembly also includes a limiting sleeve and a spring disposed in the receiving groove. The spring is disposed between the limiting sleeve and the nut and is used to provide a reverse force when the nut moves toward the groove opening of the receiving groove.

[0026] This utility model also provides a refrigeration device, the refrigeration device including an electric valve, the electric valve comprising:

[0027] The valve body includes a valve seat, a guide seat, and a bearing seat. The valve seat and the guide seat enclose a valve cavity. The valve seat is provided with a valve port communicating with the valve cavity. The guide seat has a guide hole along its axial direction. The bearing seat is installed at the end of the connecting hole away from the valve port. The bearing seat is provided with a mounting hole extending along its axial direction, and the mounting hole communicates with the guide hole.

[0028] A valve core assembly includes a nut and a valve core connected to one end of the nut, the valve core being movably mounted in the guide hole along the depth direction of the guide hole, and the other end of the nut extending into the mounting hole;

[0029] The rotor assembly includes a rotor, a bearing, and a lead screw. The bearing is sleeved around the lead screw and mounted on the bearing housing. One end of the lead screw is connected to the rotor, and the other end extends into the mounting hole to engage with the nut threadedly.

[0030] The guide seat and the bearing seat are welded together.

[0031] In one embodiment, the refrigeration equipment includes an air conditioner.

[0032] In this invention, the guide seat and bearing seat are designed with independent structures. When selecting materials, suitable first and second profiles can be chosen according to their respective size requirements. Their diameters and heights are slightly larger than the final product dimensions, thereby reducing cutting volume, improving machining efficiency, and reducing raw material waste. After machining, the guide seat and bearing seat are welded together to form a single unit, ensuring structural strength and sealing performance while reducing manufacturing costs. Attached Figure Description

[0033] 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.

[0034] Figure 1 A schematic diagram of an embodiment of the electric valve provided by this utility model;

[0035] Figure 2 for Figure 1 A cross-sectional schematic diagram of the first embodiment of the guide seat and bearing housing;

[0036] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0037] Figure 4 for Figure 2 Cross-sectional schematic diagram of the guide seat;

[0038] Figure 5 for Figure 2 A cross-sectional view of the bearing housing;

[0039] Figure 6 for Figure 1 A cross-sectional schematic diagram of the second embodiment of the guide seat and bearing seat;

[0040] Figure 7 for Figure 1 A cross-sectional schematic diagram of the third embodiment of the guide seat and bearing seat;

[0041] Figure 8 for Figure 7 Cross-sectional schematic diagram of the guide seat;

[0042] Figure 9 for Figure 7 A cross-sectional view of the bearing housing;

[0043] Figure 10 for Figure 1 Cross-sectional schematic diagram of the valve core assembly.

[0044] Explanation of icon numbers:

[0045] 100. Electric valve; 1. Valve body; 11. Valve seat; 12. Guide seat; 12a. Guide hole; 121. Second annular step surface; 12b. Material receiving groove; 13. Bearing seat; 13a. Mounting hole; 131. Main body section; 1311. First main body section; 132. Connecting section; 1321. Main body mating section; 1322. Guide section; 133. First annular step surface; a. Valve cavity; b. Valve port; 20. Valve core assembly; 21. Nut; 211. Stop protrusion; 22. Valve core; 22a. Receiving groove; 22a1. First groove section; 22a2. Second groove section; 22c. Through hole; 221. Third annular step surface; 23. Limiting sleeve; 24. Spring; 30. Rotor assembly; 31. Rotor; 32. Bearing; 33. Lead screw; 200. Welding ring.

[0046] 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

[0047] 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.

[0048] 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.

[0049] 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.

[0050] In traditional electronic expansion valves, a multi-functional upper valve seat is typically installed internally. This upper valve seat not only needs to connect and seal with the external lower valve seat or valve seat assembly, but also needs to guide the valve core assembly and ensure the accurate positioning and fixation of the lead screw bearing assembly. Currently, such parts are mostly made of metal materials through machining, especially SUS304 stainless steel. Although this material has good mechanical properties and corrosion resistance, its high machining difficulty, requiring complex machining processes, leads to high production costs and affects the product's market competitiveness. Therefore, seeking more efficient and economical design and manufacturing solutions is key to enhancing the advantages of this type of product.

[0051] This utility model proposes an electric valve, which aims to solve the problems of high difficulty in processing the upper valve seat and high production cost of existing electric valves.

[0052] Please see Figure 1 In one embodiment of this utility model, the electric valve 100 includes a valve body 1, a valve core assembly 20, and a rotor assembly 30. The valve body 1 includes a valve seat 11, a guide seat 12, and a bearing seat 13. The valve seat 11 and the guide seat 12 enclose a valve cavity a. The valve seat 11 is provided with a valve port b communicating with the valve cavity a. The guide seat 12 is provided with a guide hole 12a along its axial direction. The bearing seat 13 is installed at the end of the connecting hole away from the valve port b. The bearing seat 13 is provided with a mounting hole 13a extending along its axial direction, and the mounting hole 13a communicates with the guide hole 12a. The valve core assembly 20 includes... The nut 21 and the valve core 22 connected to one end of the nut 21 are movably mounted in the guide hole 12a along the depth direction of the guide hole 12a. The other end of the nut 21 extends into the mounting hole 13a. The rotor assembly 30 includes a rotor 31, a bearing 32 and a lead screw 33. The bearing 32 is sleeved on the periphery of the lead screw 33 and mounted on the bearing seat 13. One end of the lead screw 33 is connected to the rotor 31, and the other end extends into the mounting hole 13a to be threadedly engaged with the nut 21. The guide seat 12 and the bearing seat 13 are welded together.

[0053] It should be noted that one end of the lead screw 33 is connected to the rotor 31. Specifically, the lead screw 33 and the rotor 31 can be connected by a fixed method, or by setting a limiting structure so that there is no relative displacement between the lead screw 22 and the rotor 31.

[0054] It should be noted that the guide seat 12, as an important guiding part of the valve core assembly 20, has a large diameter and a relatively small height to ensure that the valve core 22 slides stably inside it and achieves precise control of the valve port b.

[0055] The bearing housing 13 is mainly responsible for accommodating the lead screw 33 and nut 21 assembly. It has a small diameter but a high height to accommodate the stroke requirements of the nut 21 during the up-and-down movement of the lead screw 33.

[0056] In traditional structures, the guide seat 12 and the bearing seat 13 are usually molded as a single piece, which leads to high processing difficulty and serious material waste.

[0057] In the technical solution of this utility model, the guide seat 12 and the bearing seat 13 adopt independent structural designs. When selecting materials, suitable first and second profiles can be selected according to their respective size requirements. Their diameters and heights are slightly larger than the required dimensions of the final product, thereby reducing the amount of cutting, improving machining efficiency, and reducing raw material consumption. After processing, the guide seat 12 and the bearing seat 13 are connected into a whole by welding, which ensures structural strength and sealing performance while reducing manufacturing costs.

[0058] It should be noted that the guide seat 12 and the bearing seat 13 are welded together as a whole by brazing or laser welding. Brazing uses a filler metal (solder) with a melting point lower than that of the base material, heated to a temperature slightly higher than the melting point of the solder but lower than that of the base material, so that the solder melts and wets the surface of the base material, filling the joint through capillary action and forming a strong connection.

[0059] Laser welding is a highly efficient and precise welding method that uses a high-energy-density laser beam as a heat source. Its basic principle is to use a focusing optical system to irradiate the surface of the material to be welded with a high-power-density laser beam, heating the material to a molten state in a very short time, forming a weld pool. As the laser beam moves along a predetermined path, the weld pool cools and solidifies, forming a strong weld seam.

[0060] These two welding methods can provide a high-quality connection, ensuring the strength and sealing of the joint between the guide seat 12 and the bearing seat 13, while reducing deformation and stress concentration in the heat-affected zone.

[0061] To further improve overall assembly accuracy and connection reliability, please refer to [link / reference]. Figures 2 to 5 In a first embodiment, the bearing housing 13 includes a main body segment 131 and a connecting segment 132 arranged sequentially in a direction close to the guide seat 12. The outer diameter of the connecting segment 132 is set to be smaller than the outer diameter of the main body segment 131, so as to form a first annular stepped surface 133 facing the guide seat 12 at the connection between the connecting segment 132 and the main body segment 131. The guide hole 12a is configured as a stepped hole to have a second annular stepped surface 121 facing the bearing housing 13. The connecting segment 132 passes through the guide hole 12a, and the first annular stepped surface 133 is supported on the second annular stepped surface 121.

[0062] During assembly, the connecting section 132 passes through the guide hole 12a, so that the first annular step surface 133 and the second annular step surface 121 are in contact with each other and supported on it, thereby realizing the axial positioning of the bearing seat 13 relative to the guide seat 12.

[0063] This ensures accurate alignment of the bearing housing 13 during installation and enhances the connection stability and sealing between the guide seat 12 and the bearing housing 13 through the surface contact between the two stepped surfaces. Simultaneously, this mating structure provides a larger welding contact area for subsequent welding, improving weld strength and the overall structural reliability.

[0064] It should be noted that you should refer to [link / reference]. Figures 2 to 5 When using furnace welding (brazing), the close fit between the first annular step surface 133 and the second annular step surface 121 helps to improve the capillary penetration effect of the solder, making the weld more uniform and dense, and improving the strength and airtightness of the welded joint.

[0065] In the second embodiment, please refer to Figure 6 When laser welding is used, the effective penetration area of ​​the welding zone is increased, allowing the laser energy to be applied more concentratedly to the bonding interface, forming a high-quality, high-strength weld, while reducing the risk of welding deformation caused by local stress concentration.

[0066] Furthermore, the good contact between the first annular step surface 133 and the second annular step surface 121 can improve the self-alignment capability of the assembly before welding, reduce the complexity of the welding fixture, and improve welding efficiency and yield.

[0067] In the third embodiment, please refer to Figures 7 to 9 When laser welding is used, the bearing housing 13 includes a main body segment 131 and a connecting segment 132 arranged sequentially in the direction close to the guide seat 12. The outer diameter of the connecting segment 132 is set to be smaller than the outer diameter of the main body segment 131, so as to form a first annular step surface 133 facing the guide seat 12 at the connection between the connecting segment 132 and the main body segment 131. The connecting segment 132 passes through the guide hole 12a, and the first annular step surface 133 is supported at the upper edge of the guide hole 12a.

[0068] During assembly, the connecting section 132 is inserted into the guide hole 12a in the guide seat 12, and the first annular stepped surface 133 is supported on the upper edge of the guide hole 12a, thereby achieving axial positioning and support of the bearing seat 13 relative to the guide seat 12. This structure not only improves the alignment and stability during assembly, but also enhances the connection rigidity and sealing performance between the guide seat 12 and the bearing seat 13 through the contact between the stepped surface and the end edge of the guide hole 12a.

[0069] Specifically, when laser welding is used to fix the guide seat 12 and the bearing seat 13 together, the good fit between the first annular step surface 133 and the end edge of the guide hole 12a allows the energy to be more concentrated on the joint interface during laser welding, resulting in uniform penetration and good weld formation, effectively avoiding defects such as incomplete welding and porosity. At the same time, this mating structure increases the effective contact area of ​​the welding area, improves the strength and density of the weld joint, and makes the connection between the guide seat 12 and the bearing seat 13 more firm and reliable.

[0070] Further, please refer to Figure 2 and Figure 3 The main body segment 131 has a first main body segment 1311 located within the guide hole 12a, and the first main body segment 1311 and the guide hole 12a are clearance-fitted.

[0071] The clearance fit between the first main body section 1311 and the guide hole 12a allows the bearing housing 13 to be smoothly inserted into the guide hole 12a during assembly. The clearance also enables self-centering, improving assembly convenience and alignment accuracy. Simultaneously, this clearance provides a channel for solder flow, allowing it to more easily flow into the mating surfaces. This facilitates the full filling of the joint with welding material, enhancing weld strength and sealing, resulting in a more uniform, dense, and stronger weld, thus improving the quality and sealing performance of the welded joint. Furthermore, this clearance fit also helps alleviate stress concentration problems caused by machining errors or differences in thermal expansion.

[0072] Further, please refer to Figure 4 In this embodiment, the connecting segment 132 includes a main body mating segment 1321 and a guide segment 1322 arranged sequentially in the direction close to the second annular step surface 121, and the outer diameter of the guide segment 1322 is set to be smaller than that of the main body mating segment 1321.

[0073] Thus, the guide section 1322 is located on the side close to the second annular step surface 121, and its outer diameter is set to be smaller than the outer diameter of the main mating section 1321. This allows the guide section 1322 to be inserted into the step hole of the guide seat 12 first during assembly, playing a guiding and centering role, ensuring accurate docking between the bearing seat 13 and the guide seat 12, and avoiding misalignment or tilting caused by assembly deviation. After the guide section 1322 is successfully inserted, the main mating section 1321 forms a tight fit with the second annular step surface 121, achieving stable axial support and limiting.

[0074] This not only improves assembly efficiency and precision, but also makes it easier for the guide section 1322 to enter the positioning position during assembly due to its smaller diameter. It also enables self-centering during the assembly process, reducing assembly difficulty and improving assembly efficiency. At the same time, the guide section 1322 helps reduce frictional resistance and interference risks during the assembly process, making the connection smoother and more precise.

[0075] Specifically, in this embodiment, the outer diameter of the main body mating section 1321 is D1, and the outer diameter of the guide section 1322 is D2, where 0.03mm≤D1-D2≤0.08mm.

[0076] The dimensional difference between D1 and D2 is set between 0.03mm and 0.08mm, so that the guide section 1322 can be easily inserted into the stepped hole of the guide seat 12 during assembly, playing a preliminary positioning and guiding role. The main body mating section 1321 then fits tightly with the second annular stepped surface 121, ensuring that the axial limiting between the bearing seat 13 and the guide seat 12 is stable and reliable. This ensures smooth assembly and prevents the overall rigidity and sealing performance of the structure from being affected by excessive gaps.

[0077] Furthermore, in this embodiment, the main body mating section 1321 is interference-fitted with the guide hole 12a.

[0078] Understandably, the outer diameter of the main mating section 1321 is slightly larger than the inner diameter of the guide hole 12a, thus requiring a certain pressure to ensure a tight fit during assembly. This ensures that the bearing seat 13 and the guide seat 12 are axially positioned not only through the second annular stepped surface 121, but also through the tight contact between the main mating section 1321 and the guide hole 12a, further enhancing the overall rigidity and stability of the structure. Furthermore, the interference fit effectively prevents loosening or displacement of components due to vibration or external loads during use, ensuring the long-term reliability of the electric valve 100. During welding, the tighter fit between the guide seat 12 and the bearing seat 13 results in a more uniform and robust weld, further enhancing the stability and durability of the connection.

[0079] Specifically, in this embodiment, the interference fit between the main body mating section 1321 and the guide hole 12a is set to δd, where 0.01mm≤δd≤0.04mm.

[0080] Thus, by limiting the interference fit between the main body mating section 1321 and the guide hole 12a within the aforementioned range, it is ensured that the main body mating section 1321 can achieve a tight fit with the guide hole 12a during assembly by applying appropriate pressure, while avoiding the risk of assembly difficulties or material deformation due to excessive interference fit. Within this range, the contact pressure formed between the two is sufficient to effectively prevent relative displacement caused by vibration, temperature changes, or fluid impact during operation, thereby ensuring the stability and sealing of the overall structure of the electric valve 100.

[0081] Further, please refer to Figure 2 and Figure 3 In this embodiment, the guide seat 12 is recessed on the end face facing the bearing seat 13, and the bottom of the groove is provided with the guide hole 12a. The bearing seat 13 passes through the guide hole 12a to define an annular material groove 12b for accommodating the welding ring 200 between the inner wall of the groove and the outer wall of the bearing seat 13.

[0082] The annular material groove 12b is used to pre-place the welding ring 200 (such as a brazing ring) before welding. During subsequent brazing or laser welding processes, the welding ring 200 melts when heated and can evenly fill the connection between the guide seat 12 and the bearing seat 13, thereby forming a high-strength, high-sealing welded joint.

[0083] By pre-placing the welding ring 200 in the material container 12b, not only is the accuracy of the solder positioning improved, but the loss or displacement of the solder during the welding process is also effectively prevented, thereby improving the consistency of welding quality and the yield.

[0084] In this embodiment, the guide seat 12 is made of stainless steel; and / or, the bearing seat 13 is made of stainless steel.

[0085] It should be noted that because the guide seat 12 is made of stainless steel, this material has good mechanical strength, corrosion resistance, and processing performance, which can meet the long-term stable operation requirements of the electric valve 100 in complex environments. As the guide structure of the valve core assembly 20, the guide seat 12 is in direct contact with the valve core 22 and slides relative to it. The use of stainless steel helps to improve its wear resistance and dimensional stability, thereby ensuring the sensitivity and repeatability of the valve core 22.

[0086] The bearing housing 13 supports the lead screw 33 and nut 21 assembly and withstands certain mechanical stress. The use of stainless steel effectively improves its structural rigidity and fatigue resistance. In addition, the guide seat 12 and the bearing housing 13 are welded together to form an integral structure after being machined separately. The good welding performance between stainless steel materials also ensures that the connection part has high strength and sealing performance.

[0087] Preferably, in this embodiment, the guide seat 12 is made of SUS304 or SUS303Cu.

[0088] It should be noted that SUS304 has good corrosion resistance, mechanical strength and machinability, which can meet the requirements of long-term stable operation of guide seat 12 under various working conditions, and is especially suitable for occasions with high requirements for corrosion resistance and wear resistance; while SUS303Cu is based on SUS303 with the addition of copper element, which further improves the machinability of the material, and improves the processing efficiency while ensuring mechanical properties, making it particularly suitable for parts that require precision machining.

[0089] Furthermore, in order to ensure that when the lead screw 33 rotates relative to the nut 21, the nut 21 only produces linear motion along its axial direction to drive the valve core 22 to open or close the valve port b, and to avoid transmission failure or unstable control due to the circumferential rotation of the nut 21 itself, in this embodiment, the inner wall of the mounting hole 13a is provided with an anti-rotation part, and the outer wall of the nut 21 is provided with a mating part that cooperates with the anti-rotation part to restrict the circumferential rotation of the nut 21.

[0090] An anti-rotation part is provided on the inner wall of the mounting hole 13a, and correspondingly, a mating part that mates with the anti-rotation part is provided on the outer wall of the nut 21. This anti-rotation mating structure can effectively restrict the circumferential degree of freedom of the nut 21 after assembly, so that it can only move axially under the guidance of the guide groove.

[0091] Specifically, the anti-rotation part can be one or more limiting protrusions protruding in a local area of ​​the inner wall of the mounting hole 13a, while the mating part is a groove or planar structure correspondingly provided on the outer wall of the nut 21. The two are adapted to each other to form an anti-rotation mating relationship.

[0092] As another implementation, the cross-sectional shape of at least one segment of the mounting hole 13a can be designed to be non-circular, such as an elongated hole or other irregularly shaped hole with a limiting function. Correspondingly, the outer peripheral part of the nut 21 that mates with the segment of the hole is also machined to match the cross-sectional shape, so that the nut 21 cannot rotate around its own axis after being inserted into the mounting hole 13a, but can still slide freely along the axial direction of the hole.

[0093] Through the design of the anti-rotation structure, during the operation of the electric valve 100, when the lead screw 33 rotates under the drive of the motor, the nut 21 cannot rotate synchronously due to the restriction of the anti-rotation structure. Therefore, it can only move along the axial direction under the drive of the lead screw 33, thereby pushing or pulling the valve core 22 to make linear reciprocating motion in the guide groove, so as to achieve precise control of the valve port b opening degree.

[0094] Furthermore, to improve the sealing stability of the valve core assembly 20 in the closed state, especially to address potential seal failures caused by material thermal expansion and contraction at high temperatures, please refer to [link to relevant documentation]. Figure 1 and Figure 10 In this embodiment, the valve core 22 has a recessed receiving groove 22a at one end away from the nut 21, and a through hole 22c is provided at the bottom of the receiving groove 22a; the nut 21 passes through the through hole 22c, and a stop protrusion 211 is provided on the outer side wall of the end of the nut 21 located in the receiving groove 22a. The stop protrusion 211 is used to limit the axial movement of the nut 21 and is movably disposed relative to the valve core 22; the valve core assembly 20 also includes a spring 24 and a limiting sleeve 23 disposed in the receiving groove 22a. The spring 24 is disposed between the limiting sleeve 23 and the nut 21, and the spring 24 is used to provide a reverse force when the nut 21 moves toward the groove opening of the receiving groove 22a.

[0095] It is understood that a receiving groove 22a is recessed at the end of the valve core 22 away from the nut 21, and a through hole 22c is formed through the bottom of the receiving groove 22a for the nut 21 to pass through. After the nut 21 passes through the through hole 22c, a stop protrusion 211 is provided on the outer wall of the end of the nut 21 located in the receiving groove 22a. The stop protrusion 211 serves to limit the axial movement range of the nut 21 on the valve core 22, and allows the nut 21 to undergo axial displacement relative to the valve core 22 within a certain range.

[0096] In addition, the valve core assembly 20 also includes a spring 24 and a limiting sleeve 23. The spring 24 is disposed between the limiting sleeve 23 and the nut 21 and is located inside the receiving groove 22a. When the nut 21 drives the valve core 22 to move toward the valve port a and completes the closing action, the spring 24 is compressed to store elastic potential energy and applies a force to the nut 21 that is always toward the valve port a, so that the valve core 22 can fit more tightly against the periphery of the valve port a and improve the sealing performance.

[0097] 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 a (usually made of plastic material) may expand due to heat and push the valve core assembly 20 upward, causing a small gap to appear in the originally closed valve port a. After the temperature returns to normal, the material of valve port a shrinks, but at this time, due to the gap between the threaded pair between the lead screw 13 and the nut 21, the valve core assembly 20 may not be able to automatically return to the initial closed position, causing problems such as poor sealing or even leakage.

[0098] In this invention, since the spring 24 is always in a compressed state during the closing process of the valve core assembly 20, it can provide continuous preload under any temperature change conditions. This not only helps to enhance the sealing pressure between the valve core 22 and the valve port a 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 24 after high temperature retraction, so that the valve core 22 always maintains good contact with the periphery of the valve port a, ensuring stable and reliable sealing performance.

[0099] In this embodiment, please continue to refer to Figure 4 The receiving groove 22a includes a first groove segment 22a1 and a second groove segment 22a2 arranged sequentially from the inside to the outside. The first groove segment 22a1 is recessed relative to the second groove segment 22a2, so that a third annular step surface 221 facing outward is formed between the first groove segment 22a1 and the second groove segment 22a2. The limiting pressure sleeve 23 is supported on the third annular step surface 221.

[0100] It is understood that the valve core 22 is recessed at one end away from the nut 21 with a receiving groove 22a. The receiving groove 22a is set with its overall opening facing the valve port a, so that the nut 21, spring 24 and limiting sleeve 23 can be installed into the groove in sequence from one side of the groove, so as to achieve convenient assembly.

[0101] The receiving groove 22a includes a first groove segment 22a1 and a second groove segment 22a2 arranged sequentially from the inside to the outside along the axial direction. The inner diameter of the first groove segment 22a1 is relatively small and has an inwardly converging structure, while the inner diameter of the second groove segment 22a2 is larger. At the connection between the two, a third annular step surface 221 facing outward is formed. The limiting pressure sleeve 23 is supported on this step surface, thereby achieving stable positioning within the receiving groove 22a.

[0102] The first groove 22a1 is mainly used to accommodate the stop protrusion 211 of the nut 21 located on its outer side wall, so that the stop protrusion 211 is restricted in the axial direction by the structure of the accommodating groove 22a, preventing the nut 21 from being displaced excessively; while the second groove 22a2 mainly provides installation space for the limiting pressure sleeve 23, and with its large inner diameter design, it provides sufficient clearance space for the axial movement generated by the nut 21 in the process of driving the valve core 22 to close the valve port a, so as to avoid affecting the smoothness of the valve core 22's operation due to structural interference.

[0103] In addition, the function of the limiting sleeve 23 is to stably press the spring 24 inside the receiving groove 22a, so that it can maintain a good force state in the compressed state and effectively transmit the elastic force to the nut 21.

[0104] It should be noted that the limiting sleeve 23 can be fixedly connected to the valve core 22 by means of interference fit or welding. Considering the assembly efficiency and sealing performance, welding is preferred to firmly connect it to the valve core 22, so as to ensure that the limiting sleeve 23 will not loosen or fall off during long-term operation.

[0105] Thus, by using the segmented receiving groove 22a structure in conjunction with the limiting sleeve 23, the assembly stability of the spring 24 assembly inside the valve core 22 is improved, the overall assembly process is simplified, and the reliability and manufacturability of the product are enhanced.

[0106] 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.

[0107] 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 includes a valve seat, a guide seat, and a bearing seat. The valve seat and the guide seat enclose a valve cavity. The valve seat is provided with a valve port communicating with the valve cavity. The guide seat has a guide hole along its axial direction. The bearing seat is installed at the end of the guide hole away from the valve port. The bearing seat is provided with a mounting hole extending along its axial direction, and the mounting hole communicates with the guide hole. A valve core assembly includes a nut and a valve core connected to one end of the nut, the valve core being movably mounted in the guide hole along the depth direction of the guide hole, and the other end of the nut extending into the mounting hole; The rotor assembly includes a rotor, a bearing, and a lead screw. The bearing is sleeved around the lead screw and mounted on the bearing housing. One end of the lead screw is connected to the rotor, and the other end extends into the mounting hole to engage with the nut threadedly. The guide seat and the bearing seat are welded together.

2. The electric valve as described in claim 1, characterized in that, The guide seat and the bearing seat are connected by brazing or laser welding.

3. The electric valve as described in claim 1, characterized in that, The bearing housing includes a main body segment and a connecting segment arranged sequentially in a direction close to the guide seat. The outer diameter of the connecting segment is set to be smaller than the outer diameter of the main body segment, so as to form a first annular stepped surface facing the guide seat at the connection between the connecting segment and the main body segment. The guide hole is configured as a stepped hole, having a second annular stepped surface facing the bearing seat; the connecting section passes through the guide hole, and the first annular stepped surface is supported on the second annular stepped surface; or... The connecting section passes through the guide hole, and the first annular stepped surface is supported at the upper edge of the guide hole.

4. The electric valve as described in claim 3, characterized in that, The main body segment has a first main body segment located within the guide hole, and the first main body segment and the guide hole are clearance-fitted.

5. The electric valve as described in claim 3, characterized in that, The connecting section includes a main mating section and a guide section arranged sequentially in the direction close to the second annular step surface, and the outer diameter of the guide section is set to be smaller than that of the main mating section.

6. The electric valve as described in claim 5, characterized in that, The outer diameter of the main body mating section is D1, and the outer diameter of the guide section is D2, where 0.03mm ≤ D1 - D2 ≤ 0.08mm.

7. The electric valve as described in claim 5, characterized in that, The main body fitting section is interference-fitted with the guide hole.

8. The electric valve as described in claim 5, characterized in that, The interference fit between the main body mating section and the guide hole is set to δd, where 0.01mm≤δd≤0.04mm.

9. The electric valve as described in claim 1, characterized in that, The guide seat has a recessed groove on its end face facing the bearing seat, and the bottom of the groove has a guide hole. The bearing seat passes through the guide hole to define an annular material groove for accommodating the welding ring between the inner wall of the groove and the outer wall of the bearing seat.

10. The electric valve as claimed in claim 1, characterized in that, The guide seat is made of stainless steel; and / or, The bearing housing is made of stainless steel.

11. The electric valve as claimed in claim 10, characterized in that, The guide seat is made of SUS304 or SUS303Cu.

12. The electric valve as claimed in claim 1, characterized in that, The valve core is recessed at one end away from the nut, and a through hole is provided at the bottom of the recess. The nut passes through the through hole, and a stop protrusion is provided on the outer side wall of one end of the nut located in the receiving groove. The stop protrusion is used to limit the axial movement of the nut and is movably disposed relative to the valve core. The valve core assembly also includes a limiting sleeve and a spring disposed in the receiving groove. The spring is disposed between the limiting sleeve and the nut and is used to provide a reverse force when the nut moves toward the groove opening of the receiving groove.

13. A refrigeration device, characterized in that, Includes the electric valve as described in any one of claims 1 to 12.

14. The refrigeration equipment as described in claim 13, characterized in that, The refrigeration equipment includes an air conditioner.

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