Electronic expansion valve structure and vehicle

Abstract

The electronic expansion valve structure comprises a valve body assembly, the valve body assembly comprises a valve seat part, a nut assembly and a valve needle part, the valve needle part comprises a large valve needle assembly and a small valve needle assembly, the small valve needle assembly is connected with the large valve needle assembly in an axial displacement mode, and the nut assembly is connected with the small valve needle assembly in an axial displacement mode. A large pressing sleeve used for axially limiting the small valve needle assembly is arranged on the large valve needle assembly, a valve element and a rotor which are coaxially arranged are arranged in the shell, a compression spring is arranged in the valve seat component, and the valve needle component is sleeved with the compression spring. One end of the compression spring is in contact with the nut assembly, and the other end of the compression spring is in contact with the large pressing sleeve. The sealing performance of the large valve port of the electronic expansion valve and the action reliability of a switch valve can be effectively improved, and the electronic expansion valve has the advantages of being few in part and simple and reliable in assembly process.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic expansion valves, and specifically discloses an electronic expansion valve structure and a vehicle. Background Art

[0002] In the refrigeration system, the control method of the electronic expansion valve is that the controller calculates the parameters collected by the sensor, sends an adjustment command to the control board, and the control board outputs an electrical signal to the electronic expansion valve. Then, the rotation of the stepper motor drives the valve needle axially up and down to adjust the throttling area of ​​the electronic expansion valve port, thereby achieving control of the cooling capacity. In automotive air conditioners, a large-caliber full-pass throttling electronic expansion valve can be used to replace a small-caliber electronic expansion valve and a stop valve. It has the functions of regulating flow and full circulation, achieving the effect of reducing costs, but the performance requirements of the valve, especially the sealing performance, have been improved.

[0003] In the Chinese utility model patent application with application number 2022202498365, an electronic expansion valve is disclosed, comprising: a valve seat component, the valve seat component has a large valve port; a valve needle component, arranged in the cavity of the valve seat component, the valve needle component comprises a large valve needle part, a small valve needle and a drive assembly, the large valve needle part has a conical small valve port, the end of the small valve port with a large opening is away from the large valve port, the drive assembly and the small valve needle and the large valve needle part are all driven and connected; the electronic expansion valve has a closed state, a flow regulating state and a fully open state; wherein, in the closed state, the small valve needle is inserted into the small valve port to block the small valve port, and the large valve needle part blocks the large valve port; in the flow regulating state, the large valve needle part blocks the large valve port, and the small valve needle is axially movable to adjust the opening of the small valve port; in the fully open state, the large valve needle part avoids the large valve port. The technical solution provided by the utility model can solve the problem that the electronic expansion valve in the prior art cannot achieve small flow regulation. In this invention patent, a spring is set between the small valve needle and the large valve needle. When the small valve port is closed, the large valve needle is subjected to the downward pressure of the spring and blocks the sealing gasket at the large valve port to ensure the sealing reliability of the large valve port. However, this control method has some defects. First, under low flow conditions, it is difficult to fine-tune the electronic expansion valve, which is prone to unstable cooling capacity. However, when the small valve needle opens the valve upward, the spring force on the large valve needle is weakened, resulting in poor sealing performance. At the same time, because the small valve needle is always subjected to the axial spring force, the transmission thread mechanism is severely worn when the valve is switched on and off, affecting the reliability of the valve operation.

[0004] Furthermore, an electronic expansion valve is disclosed in the Chinese invention patent application with application number 2022202501086. The utility model provides an electronic expansion valve, including: a valve seat component; a large sealing gasket, which is arranged in the cavity of the valve seat component, and the large sealing gasket has a large valve port; a reinforcing seal, which is arranged between the large sealing gasket and the inner wall of the valve seat component; a valve needle component, which is arranged in the cavity of the valve seat component, and the valve needle component includes a large valve needle part, and the large valve needle part is used to cooperate with the large sealing gasket to open and close the large valve port. Since the large sealing gasket is prone to deformation after long-term use, leakage will occur between the large sealing gasket and the inner wall of the valve seat component after assembly. With this solution, the reinforcing seal is arranged between the large sealing gasket and the inner wall of the valve seat component, which further improves the sealing effect of the large valve port, effectively avoids fluid leakage, and also improves the service life of the electronic expansion valve. In this invention patent, a seal is placed between the large seal and the valve seat to improve air tightness and prevent leakage. The large seal is fixed by a limit structure. During the assembly process, it is easy to deform due to uneven force or poor dimensional coaxiality, which eventually leads to poor sealing performance at the large valve port. In addition, this structure has the disadvantages of many parts, complex process, and difficulty in installation. Summary of the invention

[0005] In order to solve the shortcomings and deficiencies in the above-mentioned prior art, the present invention provides a structure and vehicle of an electronic expansion valve, which can not only effectively improve the sealing performance of the large valve port of the electronic expansion valve and the operation reliability of the switch valve, but also has the advantages of fewer parts and simple and reliable assembly process.

[0006] The present invention discloses an electronic expansion valve structure, comprising a valve body assembly, wherein the valve body assembly comprises a valve seat component, a nut assembly and a valve needle component, wherein the valve needle component comprises a large valve needle component and a small valve needle component, wherein the small valve needle component is axially displaceable and connected to the large valve needle component, wherein the large valve needle component is provided with a large compression sleeve for axially limiting the small valve needle component, wherein a coaxially arranged valve core and a rotor are provided in the housing, wherein a compression spring is provided in the valve seat component, wherein the compression spring is sleeved on the valve needle component, wherein one end of the compression spring contacts the nut assembly, and the other end contacts the large compression sleeve.

[0007] In a preferred embodiment of the present invention, the large press sleeve is cylindrical, a mounting hole for mounting the small valve needle assembly is provided at the center of the large press sleeve, and an annular boss for cooperating with the small valve needle assembly to realize its axial displacement is provided at the end of the large press sleeve.

[0008] In a preferred embodiment of the present invention, the small valve needle assembly includes a coaxially arranged worm, a small pressure sleeve and a small valve needle, the worm and the small pressure sleeve are connected by a bearing, the small valve needle is inserted into the end of the small pressure sleeve, a preload spring is arranged between the worm and the small valve needle, the worm is provided with a side hole extending along its radial direction, the end face of the worm is provided with a circular groove arranged coaxially with the worm, the circular groove and the side hole are connected, the small valve needle is provided with a circular hole passing through the axial direction thereof, the circular hole and the circular groove are arranged coaxially, and the small pressure sleeve is provided with a raised feature that cooperates with the annular boss.

[0009] In a preferred embodiment of the present invention, during the opening process of the electronic expansion valve, the valve needle component includes two movement stages, the first movement stage: the small valve needle assembly opens from the zero position to the first opening L1, L1=H2-H1, and the small valve port is opened; the large valve needle assembly does not move, the large valve port is not opened, and the installation height of the compression spring remains unchanged; the second movement stage: after the small valve needle assembly is opened, it continues to drive the large valve core assembly to open axially to a certain opening L2, L2=H3-H0, and the large valve port is opened; the compression rate of the compression spring is equal to L2; H0 is the reference plane, H1 is the distance from the upper end surface of the raised feature to H0, H2 is the distance from the lower end surface of the annular boss to H0, and H3 is the distance from the lower end surface of the large valve needle to H0 when the large valve needle assembly is in the open state.

[0010] In a preferred embodiment of the present invention, the lower end surface of the large valve needle assembly is provided with a sealing gasket mounting groove coaxially arranged therewith.

[0011] In a preferred embodiment of the present invention, a sealing gasket is arranged in the sealing gasket installation groove.

[0012] In a preferred embodiment of the present invention, the sealing gasket installation groove is annular, the cross-sectional shape of the sealing gasket installation groove is rectangular, and the inner circumference of the sealing gasket installation groove is processed with at least one circle of grooves along the radial inner edge of the large valve needle assembly.

[0013] In a preferred embodiment of the present invention, the small valve needle assembly includes a coaxially arranged worm, a small pressure sleeve and a small valve needle, the worm and the small pressure sleeve are connected by a bearing, the small valve needle is inserted into the end of the small pressure sleeve, a preload spring is arranged between the worm and the small valve needle, the worm is provided with a side hole extending along its radial direction, the end face of the worm is provided with a circular groove arranged coaxially with the worm, the circular groove and the side hole are connected, the small valve needle is provided with a circular hole penetrating along its axial direction, and the circular hole and the circular groove are arranged coaxially.

[0014] In a preferred embodiment of the present invention, the valve seat component includes a valve seat and a connecting seat, and the valve seat is provided with an annular boss for cooperating with a sealing gasket.

[0015] In a preferred embodiment of the present invention, the outer diameter of the annular boss is smaller than the outer diameter of the sealing gasket.

[0016] The invention also discloses a vehicle, which comprises an electronic expansion valve structure.

[0017] The beneficial effects of the present invention are as follows: the present invention discloses a new electronic expansion valve structure, which cleverly solves the problems of sealing failure and unreliable operation in the prior art, and greatly improves the service life and performance reliability of the electronic expansion valve through structural optimization, material selection and other means, providing a high-quality solution for the application of refrigeration systems.

[0018] First, the electronic expansion valve structure of the present invention includes a valve body assembly, which is composed of a valve seat component, a nut component and a valve needle component. Among them, the valve needle component includes a large valve needle component and a small valve needle component. The small valve needle component can be axially connected to the large valve needle component, and the large valve needle component is provided with a large compression sleeve for limiting the small valve needle component. This structure can effectively separate the actions of the large and small valve needles, avoiding the problem of reduced sealing performance of the large valve needle when the small valve needle is opened.

[0019] In addition, the present invention provides a compression spring inside the valve body, which is sleeved on the valve needle component, with one end in contact with the nut assembly and the other end in contact with the large compression sleeve. This design can ensure that the large valve needle component is always subjected to sufficient axial pressure, ensuring the sealing reliability of the large valve port, while also preventing the small valve needle from being subjected to the axial spring force for a long time, reducing the wear of the transmission mechanism and improving the action reliability.

[0020] Furthermore, in order to solve the problem that the large gasket is easily deformed during assembly, the present invention provides a coaxially arranged gasket installation groove on the lower end surface of the large valve needle assembly, and places a gasket inside the groove. The cross section of the gasket installation groove is rectangular, and the inner wall is also processed with a radially inward groove, which can effectively limit the deformation of the gasket and further improve the sealing performance;

[0021] Finally, the technical features that make a substantial contribution to the present invention also include: during the opening process of the electronic expansion valve, the valve needle component includes two movement stages, the first movement stage: the small valve needle assembly opens from the zero position to the first opening L1, L1=H2-H1, and the small valve port is opened; the large valve needle assembly does not move, the large valve port is not opened, and the installation height of the compression spring remains unchanged; the second movement stage: after the small valve needle assembly is opened, it continues to drive the large valve core assembly to open axially to a certain opening L2, L2=H3-H0, and the large valve port is opened; the compression rate of the compression spring is equal to L2; H0 is the reference plane, H1 is the distance from the upper end surface of the raised feature to H0, H2 is the distance from the lower end surface of the annular boss to H0, and H3 is the distance from the lower end surface of the large valve needle to H0 when the large valve needle assembly is in the open state. It should be pointed out that in the first movement stage of the present invention, the rotor and the screw drive the small valve core assembly to move axially as a whole, and the small valve needle assembly including the thread pair is not subjected to the axial compression spring force, and the wear is small; at the same time, the compression spring force remains unchanged, which can ensure the reliability of the sealing between the large valve core assembly and the large valve port and avoid leakage; while in the technical solution of the prior art, when the small valve needle opens the valve upward in the first movement stage of valve opening, the spring force on the large valve needle is weakened, resulting in poor sealing performance. At the same time, because the small valve needle is always subjected to the axial spring force, the transmission thread mechanism is seriously worn when the valve is switched, affecting the reliability of the valve operation; in the present invention, the rotor and the screw drive the small valve core assembly and the large valve core assembly to move axially as a whole, and the large valve needle assembly including the thread pair is subjected to the axial compression spring force, that is, the large valve needle assembly of the present invention is only subjected to the compression spring force in the second stage, while the large valve needle assembly of the technical solution of the prior art will receive the spring force in both stages, so the present invention can effectively solve the technical defects existing in the comparative document. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments disclosed in the present invention, the drawings of the embodiments will be briefly introduced below. These drawings are only used for illustrative purposes and are not intended to limit the protection scope of the present invention.

[0023] Figure 1 : An axial cross-sectional view of the electronic expansion valve of the present invention;

[0024] Figure 2 : Structural diagram of the valve body assembly;

[0025] Figure 3 : Schematic diagram of the structure of the valve needle component;

[0026] Figure 4 : Schematic diagram of the structure of the large valve needle assembly;

[0027] Figure 5 : Schematic diagram of the structure of the large valve needle;

[0028] Figure 6: Schematic diagram of the structure of the small valve needle assembly;

[0029] Figure 7 : Structural diagram of valve seat components;

[0030] Figure 8 : Schematic diagram of the structure of the nut assembly;

[0031] Fig. 9 : Schematic diagram of the structure of the rotor components;

[0032] Fig.10 : Schematic diagram of the valve opening process of the electronic expansion valve of the present invention. DETAILED DESCRIPTION

[0033] The technical solution of the present invention (including the preferred technical solution) is further described in detail below by means of the accompanying drawings and by listing some optional embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] like Figure 1-10 As shown, the present invention discloses an electronic expansion valve structure, which is composed of two major components: a valve body assembly 100 and a coil assembly 200.

[0035] The valve body assembly 100 is the core structure of the electronic expansion valve, and is composed of the following main components: a valve seat component 110, a valve needle component 120, a nut assembly 130, and a rotor component 140. The valve seat component 110 adopts a fixed connection design of a valve seat 111 and a connecting seat 112 to ensure the stability of the overall structure. An annular boss 114 is provided on the valve seat 111, and the annular boss 114 is smaller than the outer diameter of the sealing gasket 150, which is conducive to improving the sealing effect. In order to further enhance the sealing performance, the valve seat component 110 is also equipped with an O-ring 113.

[0036] The valve needle component 120 is the key actuator of the electronic expansion valve, and the valve needle component 120 includes a large valve needle assembly 121 and a small valve needle assembly 122. The sealing gasket 150 in the large valve needle assembly 121 is made of soft plastic or rubber material and is fixed to the large valve needle by injection molding or press fitting, which can effectively improve the sealing performance. The structure of the small valve needle assembly 122 is more complex, with multiple precision holes, in order to achieve the air pressure balance of the upper and lower cavities of the valve body and ensure the stability of the valve under different working conditions.

[0037] The nut assembly 130 and the rotor component 140 together constitute the transmission system of the electronic expansion valve. The two are connected by a precise thread pair, which can achieve high-precision axial displacement of the valve core.

[0038] The working principle of the electronic expansion valve is based on a precise electromagnetic drive mechanism. The coil assembly receives an external control signal, generates a magnetic field to drive the rotor to rotate, and drives the valve core to move up and down, ultimately achieving the opening and closing control of the valve. The valve opening process is divided into two stages: first, the small valve port is opened to control a small flow rate; then the large valve needle assembly 121 continues to move to further expand the valve port opening. When closing the valve, the compression spring 160 applies elastic force to the large valve needle assembly 121 to quickly reset and seal it. It should be pointed out that the arrangement position of the compression spring 160 is the core invention of the present invention. The compression spring 160 is mounted on the valve needle assembly, and one end of the compression spring contacts the nut assembly and the other end contacts the large compression sleeve. This structural design does not belong to the conventional technical means.

[0039] The motion state of the valve needle assembly of the present invention includes two stages:

[0040] 1. The first stage: the small valve needle assembly opens from the zero position to a certain opening L1 (based on H0, L1 = H2-H1), the small valve port opens; the large valve needle assembly does not move, the large valve port does not open, and the installation height of the compression spring remains unchanged;

[0041] During this process, the rotor and the screw drive the small valve core assembly to move axially as a whole, and the small valve needle assembly including the threaded pair is not subjected to the axial compression spring force, and has less wear; at the same time, the compression spring force remains unchanged, which can ensure the sealing reliability of the large valve core assembly and the large valve port and avoid leakage; (the compression spring force is weakened in the first stage of the prior art);

[0042] 2. Second stage: After the small valve needle assembly is opened, it continues to drive the large valve core assembly to open axially to a certain opening L2 (based on H0, L2 = H3-H0), and the large valve port is opened; the compression rate of the compression spring is equal to L2;

[0043] During this process, the rotor and the screw drive the small valve core assembly and the large valve core assembly to move axially as a whole. The large valve needle assembly including the threaded pair is subjected to the axial compression spring force, resulting in increased wear; (the technical solution disclosed in the prior art is that both the first and second stages are subjected to compression spring force).

[0044] It should be pointed out that H0 is the reference plane, H1 is the distance from the upper end surface of the raised feature to H0, H2 is the distance from the lower end surface of the annular boss to H0, and H3 is the distance from the lower end surface of the large valve needle to H0 when the large valve needle assembly is in the open state; H0 is the reference plane and is the lowest position of the large valve needle assembly when the valve is closed.

[0045] To ensure the long-term stable operation of the electronic expansion valve under complex working conditions, the material selection of key components has been deeply optimized. The gasket 150 is made of special elastic polymer, and the valve needle assembly 120 is made of high-strength wear-resistant material. In addition, the assembly process has also been optimized. The injection molding or press-fitting process of the gasket 150 is simple and reliable, which is conducive to improving production efficiency and consistency.

[0046] In summary, this electronic expansion valve integrates a number of innovative technologies, and has significantly improved key indicators such as sealing reliability and operating life, and can provide high-quality flow regulation solutions for modern refrigeration systems.

[0047] The valve seat component 110 is one of the core components of the electronic expansion valve, and the quality of its structural design directly affects the sealing performance and service life of the entire valve body.

[0048] First, the fixed connection design of the valve seat 111 and the connecting seat 112 is the key. By using reliable welding, threading and other methods to firmly connect the two parts, not only can the stability of the overall structure be ensured, but also the potential for leakage can be minimized. On this basis, the surface processing of the valve seat 111 also needs to meet certain flatness and roughness indicators to create conditions for the good fit of the subsequent sealing gasket 150.

[0049] Secondly, the annular boss 114 provided on the valve seat 111 plays an important role in improving the sealing performance. Through ingenious design, the outer diameter of the boss is smaller than the outer diameter of the sealing gasket 150, which can effectively prevent the working fluid from directly scouring the surface of the sealing gasket 150. At the same time, the presence of the boss can also limit the displacement of the sealing gasket 150 to a certain extent, further improving the sealing reliability.

[0050] In order to further enhance the sealing performance of the valve seat component 110, the present invention also adds a classic sealing element, an O-ring 113, in the design. The O-ring is made of high-quality rubber material, has good elasticity and pressure resistance, and can reliably block the leakage of the working medium. Through reasonable arrangement, multiple sealing barriers are formed between the O-ring and the valve seat 111 and the connecting seat 112, greatly reducing the overall leakage risk.

[0051] In short, the careful design of the valve seat component 110 is the key to ensure the long-term stable operation of the electronic expansion valve. By optimizing the structure, material selection and process, the present invention finally constructs a valve seat core component with high sealing and high reliability.

[0052] As a key actuator of the electronic expansion valve, the performance of the valve needle component 120 has a significant impact on the working stability and flow regulation accuracy of the whole machine. The present invention has carried out in-depth optimization design from two aspects: the large valve needle component 121 and the small valve needle component 122.

[0053] The large valve needle assembly 121 is mainly responsible for realizing the large opening adjustment of the valve, among which the design of the sealing gasket 150 is particularly critical. The present invention selects high-quality soft plastic or rubber materials, and reliably fixes them on the large valve needle through injection molding or press-fitting processes, which greatly improves the sealing performance. This design can not only ensure that the large valve needle maintains a good sealing state during the opening process, but also quickly restores the sealing when the valve is closed, greatly reducing the risk of leakage of the working fluid.

[0054] The small valve needle assembly 122 is mainly used to achieve fine flow regulation of small openings. Its structure is relatively complex, and its key components include a small valve needle 1223, a small pressure sleeve 1222, and a worm 1221. The worm 1221 is provided with a radially connecting hole, and the end face of the worm 1221 is provided with a groove coaxially arranged with the worm 1221. The hole and the groove are perpendicular to each other and connected to each other. The small pressure sleeve 1222 is provided with a side hole penetrating along its radial direction, and the small valve needle 122 is provided with a circular hole penetrating along its axial direction. The above-mentioned holes, grooves, circular holes, and side holes constitute multiple precision holes. The present invention realizes the air pressure balance of the upper and lower cavities of the valve body, ensuring that the small valve needle can maintain stable and reliable action characteristics under different working conditions. At the same time, the precise matching of the small pressure sleeve and the worm is also an important guarantee for achieving micro-flow regulation.

[0055] The large valve needle assembly 121 and the small valve needle assembly 122 are connected by a large pressing sleeve 123. The large pressing sleeve 123 is cylindrical. A mounting hole for mounting the small valve needle assembly is provided in the center of the large pressing sleeve 123. An annular boss for axially limiting the small valve needle assembly is provided at the end of the large pressing sleeve 123.

[0056] It is worth mentioning that the coordination of the large and small valve needle components is also a key issue in the design process of the present invention. The present invention optimizes the size coordination and motion trajectory of the two components to enable them to smoothly and accurately complete the entire opening and closing process, avoiding problems such as valve jamming and abnormal noise.

[0057] In general, the design optimization of the valve needle component 120 ensures the stable and reliable operation of the electronic expansion valve under complex working conditions, laying a solid foundation for accurate flow regulation.

[0058] In addition to the optimized design of the valve seat component 110 and the valve needle component 120, the transmission system of the electronic expansion valve is also the focus of the present invention. The system is mainly composed of a nut assembly 130 and a rotor component 140, which is responsible for converting the electromagnetic driving force into the precise displacement of the valve core.

[0059] The nut assembly 130 adopts a high-quality thread pair structure, and through precise cooperation with the rotor component 140, a high-precision axial displacement of the valve core is achieved. In the design process, the present invention pays special attention to the processing accuracy, assembly clearance and other parameters of the thread pair to ensure that it can still maintain flexible and smooth action characteristics under complex working conditions. At the same time, the present invention also conducts special research on the lubrication problem of the thread pair, selects special lubricants with excellent performance, and effectively prolongs the service life of the transmission system.

[0060] The rotor component 140 is a key component of the electromagnetic drive mechanism, and its rotation performance directly affects the position control accuracy of the valve core. The present invention fully considers factors such as the rotor's moment of inertia and magnetic field distribution during structural design, and ultimately adopts a unique rotor structure. The rotor adopts an axial magnetic pole design, and achieves high responsiveness and stability of rotor rotation through precise magnetic field distribution optimization. At the same time, the bearing selection of the rotor component 140 has also been deeply analyzed and tested to ensure that it can maintain good dynamic characteristics under high-frequency repeated start-stop conditions.

[0061] The core working principle of the electronic expansion valve is based on a precise electromagnetic drive mechanism. When the coil assembly receives an external control signal, a strong magnetic field is generated, which drives the rotor component 140 to rotate at high speed. The rotational motion of the rotor is then converted into a precise axial displacement of the valve core through the nut assembly 130, ultimately achieving the opening and closing control of the valve. This unique drive mechanism lays the technical foundation for the intelligent control of the electronic expansion valve.

[0062] The present invention focuses on the following aspects in the optimization design of the electromagnetic drive mechanism:

[0063] The first is the optimization of magnetic field distribution. By finely adjusting key parameters such as coil windings and magnetic pole structures, the present invention ensures a high degree of uniformity in the distribution of the magnetic field in the rotor area, thus maximizing the utilization efficiency of the electromagnetic torque.

[0064] The second is the precise control of driving force. The present invention adopts an advanced closed-loop control algorithm to monitor the rotor's speed and position feedback signals in real time, and accurately adjust the coil power supply current accordingly. This precise closed-loop control ensures the high repeatability and stability of the valve core position, laying the foundation for improving the flow regulation accuracy.

[0065] The third is the optimization of action response. The present invention significantly improves the action response speed of the electronic expansion valve by optimizing key parameters such as the rotor inertia characteristics and magnetic field strength. Even under high-frequency switching conditions, the valve can maintain fast and stable action characteristics, meeting the stringent requirements of the refrigeration system for transient flow regulation.

[0066] Finally, durability is improved. The present invention pays special attention to the problems that may occur in the long-term operation of the electromagnetic drive mechanism, such as magnetic degradation and coil insulation aging. By optimizing key components such as magnetic materials and insulators, the service life of the electromagnetic drive mechanism is greatly extended.

[0067] The electromagnetic drive mechanism of the electronic expansion valve has been carefully optimized and improved by the present invention, which not only achieves high precision and high response of flow regulation, but also ensures long-term reliable operation of the whole machine under complex working conditions. This innovative drive technology is the core competitiveness of this product.

[0068] In addition to the structural optimization of the above-mentioned core components, the present invention also makes great efforts in material selection and manufacturing process, further improving the overall performance of the electronic expansion valve.

[0069] The first is the optimization of materials for key components. Taking the sealing gasket as an example, after a large number of tests and evaluations, the present invention finally selected a special elastic polymer as the material. This material not only has excellent compressive deformation resistance, but also exhibits excellent oil resistance, temperature resistance and other characteristics, and can effectively suppress the sealing failure problem caused by changes in working conditions. Similarly, for high-load components such as the valve needle assembly 120, the present invention also selects high-strength, wear-resistant special materials to ensure that it maintains a good service life under complex working conditions.

[0070] The second is the optimization design of the assembly process. Taking the installation of the gasket as an example, the present invention adopts the process of injection molding or press-fitting. This solution can not only achieve reliable fixation of the gasket and the valve needle, but also has high production efficiency and good consistency, creating favorable conditions for batch manufacturing. Similarly, the present invention also conducts in-depth research and optimization on the assembly process of other key components, and finally forms a complete set of effective manufacturing solutions.

[0071] It is worth mentioning that the present invention attaches great importance to the environmental protection and recyclability of the product in the process of material selection and process optimization. The present invention gives priority to the use of environmentally friendly and renewable materials, and minimizes energy consumption and pollution emissions in the manufacturing process. At the same time, the present invention also actively explores technologies such as modular design of components and easy disassembly, laying the foundation for efficient recycling of the product at the end of its life.

[0072] In general, the material and process optimization of the electronic expansion valve is the result of the overall and systematic advancement of the present invention. Through the precise selection of key component materials and the fine optimization of the assembly process, the present invention not only further enhances the performance of the product, but also improves its environmental friendliness, achieving the organic unity of economic and social benefits.

[0073] After the above-mentioned design optimization, the electronic expansion valve of the present invention has reached the industry-leading level in terms of performance indicators:

[0074] The first is the sealing performance. Through the optimized design of the valve seat component 110 and the valve needle component 120, the electronic expansion valve of the present invention can reliably maintain a good sealing state under complex working conditions, greatly reducing the risk of fluid leakage. Relevant test data show that under harsh conditions such as pressure pulsation and temperature fluctuation, the leakage is controlled at an extremely low level.

[0075] The second is the action performance. Thanks to the precise electromagnetic drive mechanism and transmission system design, the electronic expansion valve of the present invention can achieve fast and stable valve opening and closing action. Even under high-frequency switching conditions, the valve response time can be maintained at the millisecond level, meeting the stringent requirements of the refrigeration system for flow regulation accuracy and transient response.

[0076] The third is the service life. By optimizing the materials and manufacturing processes of key components, the electronic expansion valve of the present invention can maintain good performance stability during long-term operation. Relevant reliability tests show that the operating life of the product can reach more than 1 million times, which greatly exceeds similar products in the industry.

[0077] With excellent performance indicators and good environmental properties, the electronic expansion valve of the present invention is widely used in various modern refrigeration systems, including household air conditioners, commercial refrigerators, industrial refrigeration units, vehicles, etc. In these fields, it can not only effectively improve the overall energy efficiency of the system, but also significantly improve the refrigeration effect, creating significant use value for users.

[0078] Those skilled in the art will readily appreciate that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, combinations, replacements, improvements, etc. made within the spirit and principles of the present invention are included within the protection scope of the present invention.

Claims

1. An electronic expansion valve structure, comprising a valve body assembly, the valve body assembly comprising a valve seat component, a nut assembly and a valve needle component, the nut assembly is threadedly connected with a screw, the screw is connected to a rotor, a worm of the valve needle component is coaxially arranged in the screw, characterized in that: The valve needle component includes a large valve needle assembly and a small valve needle assembly. The small valve needle assembly is axially displaceable and connected to the large valve needle assembly. The large valve needle assembly is provided with a large compression sleeve for axially limiting the small valve needle assembly. A coaxially arranged valve core and rotor are provided in the shell. A compression spring is provided in the valve seat component. The compression spring is sleeved on the valve needle component. One end of the compression spring is in contact with the nut assembly, and the other end is in contact with the large compression sleeve.

2. The electronic expansion valve structure according to claim 1, characterized in that: The large press sleeve is cylindrical, a mounting hole for mounting the small valve needle assembly is arranged at the center of the large press sleeve, and an annular boss for cooperating with the small valve needle assembly to realize its axial displacement is arranged at the end of the large press sleeve.

3. The electronic expansion valve structure according to claim 2, characterized in that: The small valve needle assembly includes a coaxially arranged worm, a small pressure sleeve and a small valve needle, the worm and the small pressure sleeve are connected by a bearing, the small valve needle is inserted into the end of the small pressure sleeve, a preload spring is arranged between the worm and the small valve needle, the worm is provided with a side hole extending along its radial direction, the end face of the worm is provided with a circular groove arranged coaxially with the worm, the circular groove and the side hole are communicated, the small valve needle is provided with a circular hole penetrating along its axial direction, the circular hole and the circular groove are coaxially arranged, and the small pressure sleeve is provided with a raised feature that cooperates with the annular boss.

4. The electronic expansion valve structure according to claim 3, characterized in that: During the opening process of the electronic expansion valve, the valve needle component includes two movement stages: The first movement stage: the small valve needle assembly opens from the zero position to the first opening L1, L1 = H2-H1, The small valve port is open; the large valve needle assembly remains in place, the large valve port is not opened, and the installation height of the compression spring remains unchanged; The second movement stage: After the small valve needle assembly is opened, it continues to drive the large valve core assembly to open axially to a certain opening L2, L2 = H3-H0, and the large valve port is opened; the compression rate of the compression spring is equal to L2; H0 is the reference plane, H1 is the distance from the upper end surface of the raised feature to H0, H2 is the distance from the lower end surface of the annular boss to H0, and H3 is the distance from the lower end surface of the large valve needle to H0 when the large valve needle assembly is in the open state.

5. The electronic expansion valve structure according to claim 1, characterized in that: The large valve needle assembly comprises a large valve needle and a sealing gasket mounting groove arranged on the lower end surface of the large valve needle.

6. The electronic expansion valve structure according to claim 1, characterized in that: A sealing gasket is arranged in the sealing gasket installation groove.

7. The electronic expansion valve structure according to claim 6, characterized in that: The sealing gasket installation groove is annular, the cross-sectional shape of the sealing gasket installation groove is rectangular, and the inner circumferential surface of the sealing gasket installation groove is processed with at least one circle of grooves along the radial inner edge of the large valve needle assembly.

8. The electronic expansion valve structure according to claim 1, characterized in that: The valve seat component comprises a valve seat and a connecting seat, and the valve seat is provided with an annular boss for cooperating with a sealing gasket.

9. The electronic expansion valve structure according to claim 1, characterized in that: The outer diameter of the annular boss is smaller than the outer diameter of the sealing gasket.

10. A vehicle, characterized in that: It comprises the electronic expansion valve structure as described in any one of claims 1 to 9.

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