Valve assembly and electronic expansion valve having the same

Abstract

This invention provides a valve assembly and an electronic expansion valve that can solve the problem in conventional cooling systems where the noise generated when the refrigerant flows through the electronic expansion valve during operation is relatively high. [Solution] A valve assembly and an electronic expansion valve having the same, comprising: a valve seat (10) having sequentially connected upper valve chamber (10a) and lower valve chamber (10b), and a valve port (14) located at one end of the lower valve chamber (10b) away from the upper valve chamber (10a); and a guide sleeve (20) provided within the valve seat (10) and inserted into the upper valve chamber (10a) and the lower valve chamber (10b), wherein the distance between the end of the guide sleeve (20) adjacent to the valve port (14) and the valve port (14) is H, and the diameter of the lower valve chamber (10b) is D, where the ratio of H to D is between 0.4 and 0.6.

Description

Technical Field

[0001] This application claims the priority of the patent application filed with the China National Intellectual Property Administration on September 2, 2021, with the application number 202122115734.2 and the invention title "Electronic Expansion Valve", the priority of the patent application filed with the China National Intellectual Property Administration on September 2, 2021, with the application number 202122112606.2 and the invention title "Electronic Expansion Valve", the priority of the patent application filed with the China National Intellectual Property Administration on September 2, 2021, with the application number 202122118124.8 and the invention title "Valve Seat and Electronic Expansion Valve Having the Same", the priority of the patent application filed with the China National Intellectual Property Administration on September 2, 2021, with the application number 202122112835.4 and the invention title "Valve Assembly and Electronic Expansion Valve Having the Same", and the priority of the patent application filed with the China National Intellectual Property Administration on September 2, 2021, with the application number 202122113454.8 and the invention title "Valve Seat".

[0002] This application relates to the technical field of electronic expansion valves, specifically to valve assemblies and electronic expansion valves having the same.

Background Art

[0003] Currently, conventional electronic expansion valves include a housing, a valve seat and a guide sleeve. The housing has a receiving chamber, the housing cover is provided at the upper end of the valve seat, a valve chamber is provided in the valve seat, the guide sleeve is inserted into the valve chamber, and separates the receiving chamber and the valve chamber into two independent chambers. In the conventional manner, the guide sleeve and the valve chamber are generally in a transition fit, and when fluid flows through the valve chamber, turbulence may occur, which causes pressure pulsation and generates relatively large noise, affecting the comfort experience of users.

Summary of the Invention

[0004] This application provides a valve assembly and an electronic expansion valve having the same to solve the problem of high noise of the electronic expansion valve in the prior art.

[0005] According to one aspect of this application, a valve assembly is provided, comprising a valve seat having sequentially connected upper and lower valve chambers, with a valve opening located at one end of the lower valve chamber away from the upper valve chamber, and a guide sleeve provided within the valve seat and inserted into the upper and lower valve chambers, wherein the distance between the end of the guide sleeve adjacent to the valve opening and the valve opening is H, and the diameter of the lower valve chamber is D, where the ratio of H to D is between 0.4 and 0.6.

[0006] By providing the above structure, when the guide sleeve is inserted into the lower valve chamber, a gap is created between the end of the guide sleeve and the valve opening, thereby forming a pressure relief space between the guide sleeve and the lower valve chamber. This not only ensures that the pressure in the lower valve chamber remains stable when the electronic expansion valve is operating, but also reduces turbulence generated when the fluid flows through the lower valve chamber. In this way, noise during the operation of the electronic expansion valve can be effectively reduced, ensuring the normal operation of the electronic expansion valve.

[0007] Furthermore, the guide sleeve includes the third rod segment and the second segment of the first segment, with the third rod segment and the second segment arranged in a stepped manner, and the diameter of the third rod segment being larger than the diameter of the second segment. By arranging the third rod segment and the second segment of the first segment in a stepped manner and corresponding to the lower valve chamber, it is advantageous for guiding the guide sleeve during the installation process, making the installation of the guide sleeve easier and improving assembly efficiency.

[0008] Furthermore, the ratio of the diameter of the second segment to the diameter of the lower valve chamber is between 0.5 and 0.8. This configuration increases the space between the second segment and the lower valve chamber, and at the same time, based on the resonator principle, further improves the noise reduction effect of this device.

[0009] Furthermore, the ratio of the diameter of the third rod segment to the diameter of the lower valve chamber is between 0.8 and 1. This configuration creates a gap between the first segment and the lower valve chamber, while simultaneously improving the noise reduction effect of the device based on the resonator principle.

[0010] Furthermore, the diameter of the lower valve chamber is between 3 mm and 6 mm. This configuration reduces turbulence within the lower valve chamber caused by the fluid when the device is operating, thereby reducing noise during operation.

[0011] Furthermore, the height of the second segment is L, where the ratio of L to H is between 0.1 and 0.4. With the above setup, the structural relationship between the guide sleeve and the lower valve chamber can be rationally set, which not only facilitates the processing of the guide sleeve and the lower valve chamber but is also advantageous for the assembly of the guide sleeve and the lower valve chamber. At the same time, it effectively reduces turbulence caused by relatively large vortices that occur when the fluid flows through the lower valve chamber, thereby reducing noise during the operation of the device.

[0012] Furthermore, the guide sleeve has a cross-sectional structure on both sides, and a balancing passage is provided between the cross-sectional structure and the inner wall of the upper valve chamber. By providing the cross-sectional structure, multiple gaps can be formed by matching connection with the lower valve chamber, thereby further improving the noise reduction effect of the electronic expansion valve.

[0013] According to another aspect of this application, an electronic expansion valve including the above-described valve assembly is provided. [Brief explanation of the drawing]

[0014] The drawings in the specification, which constitute part of this application, are provided for further understanding of this application, and the schematic embodiments and descriptions thereof are for interpretation purposes only and do not improperly limit this application.

[0015] [Figure 1] A schematic cross-sectional view of the valve assembly in the first example provided in this application is shown. [Figure 2] A schematic cross-sectional view of the valve seat in the first example provided in this application is shown. [Figure 3] A schematic diagram of the structure of the guide sleeve in the first example provided in this application is shown. [Figure 4] A schematic cross-sectional view of the electronic expansion valve in the first example provided in this application is shown. [Figure 5] A schematic diagram of the size of the guide sleeve in the first example provided in this application is shown. [Figure 6] A schematic cross-sectional view of the electronic expansion valve in the second example provided in this application is shown. [Figure 7] A schematic cross-sectional view of the valve seat in the second example provided in this application is shown. [Figure 8] This shows a schematic diagram of the size of the guide sleeve in the second example provided in this application. [Figure 9] A schematic cross-sectional view of the electronic expansion valve in the third example provided in this application is shown. [Figure 10] This diagram shows the assembled dimensions of the guide sleeve and valve seat in the third example provided in this application. [Figure 11] A schematic diagram of the size of the guide sleeve in the third example provided in this application is shown. [Figure 12] A schematic cross-sectional view of the valve seat in the fourth example provided in this application is shown. [Figure 13] A schematic cross-sectional view of another embodiment of the valve seat in the fourth example provided in this application is shown. [Figure 14] A schematic cross-sectional view of another embodiment of the valve seat in the fourth example provided in this application is shown. [Figure 15] A schematic cross-sectional view of another embodiment of the valve seat in the fourth example provided in this application is shown. [Figure 16] A schematic diagram of the valve seat structure in the fifth example provided in this application is shown. [Figure 17] Figure 16 shows a magnified view of area E. [Figure 18] A schematic diagram of the valve seat size in the fifth example provided in this application is shown.

[0016] Here, the above drawings include the following reference numerals. 10 valve seat, 10a upper valve chamber, 10b lower valve chamber, 11 first valve chamber, 12 second valve chamber, 13 third valve chamber, 131 upper chamber of the third valve chamber, 132 lower chamber of the third valve chamber, 133 main chamber of the third valve chamber, 14 valve port, 141 first transition hole segment, 1411 first end, 1412 second end, 142 second transition hole segment, 15 first connection hole, 151 first straight hole segment, 152 first tapered hole segment, 153 second straight hole segment, 154 second tapered hole segment, 16 second connection hole, 17 first connection port, 18 second connection port, 20 guide sleeve, 21 first segment, 21a first rod segment, 21b second rod segment, 21c third rod segment, 22 second segment, 23 cross-sectional structure, 30 casing, 31 accommodation chamber, 40 nut sleeve, 50 screw, 60 spindle assembly.

Embodiments for Carrying Out the Invention

[0017] Hereinafter, referring to the drawings in the embodiments of the present application, the technical aspects in the embodiments of the present application will be clearly and completely described. However, it is clear that the described embodiments are merely some of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0018] As shown in Figures 1 to 3, embodiments of the present application provide a valve assembly including a valve seat 10 and a guide sleeve 20. Here, the valve seat 10 has an upper valve chamber 10a and a lower valve chamber 10b that are sequentially connected, and the valve seat 10 has a valve opening 14 located at one end of the lower valve chamber 10b away from the upper valve chamber 10a, and the guide sleeve 20 is provided inside the valve seat 10 and inserted into the upper valve chamber 10a and the lower valve chamber 10b, the distance between the end of the guide sleeve 20 close to the valve opening 14 and the valve opening 14 is H, and the diameter of the lower valve chamber 10b is D, where the ratio of H to D is between 0.4 and 0.6. By providing the above structure, the guide sleeve 20 is inserted into the lower valve chamber 10b, and at the same time, a gap is maintained between the end of the guide sleeve 20 and the valve port 14, thereby forming a balancing passage between the guide sleeve 20 and the lower valve chamber 10b. This not only ensures that the pressure in the lower valve chamber 10b remains stable when the electronic expansion valve is operating, but also reduces turbulence generated when the fluid flows through the lower valve chamber 10b. In this way, noise during operation of the electronic expansion valve can be effectively reduced, ensuring the normal operation of the electronic expansion valve.

[0019] In the technical aspects provided in this application, the guide sleeve 20 and the lower valve chamber 10b are inserted and connected, and a gap is provided between the end of the guide sleeve 20 and the valve opening 14. In this way, a pressure relief space can be formed between the guide sleeve 20 and the lower valve chamber 10b, and at the same time, by utilizing the resonator principle, pressure fluctuations when the fluid flows through the lower valve chamber 10b can be effectively reduced, thereby reducing noise during operation of the electronic expansion valve and ensuring the normal operation of the electronic expansion valve.

[0020] Furthermore, the guide sleeve 20 includes the third rod segment 21c and the second segment 22 of the first segment 21, with the third rod segment 21c and the second segment 22 being arranged in a stepped manner, and the diameter of the third rod segment 21c being larger than the diameter of the second segment 22. By arranging the third rod segment 21c and the second segment 22 in a stepped manner and in correspondence with the lower valve chamber 10b, it is advantageous to guide the guide sleeve 20 during the installation process, making the installation of the guide sleeve 20 easier and improving assembly efficiency.

[0021] As shown in Figure 5, the diameter of the second segment 22 is D2. Specifically, the ratio of the diameter D2 of the second segment 22 to the diameter of the lower valve chamber 10b is between 0.5 and 0.8. This configuration increases the space between the second segment 22 and the lower valve chamber 10b, reducing turbulence and further improving the noise reduction effect of this device.

[0022] As shown in Figure 5, the diameter of the third rod segment 21c is D1. Furthermore, the ratio of the diameter D1 of the third rod segment 21c to the diameter of the lower valve chamber 10b is between 0.8 and 1. This configuration creates a gap between the first segment 21 and the lower valve chamber 10b, and at the same time, based on the resonator principle, further improves the noise reduction effect of this device.

[0023] Specifically, the diameter of the lower valve chamber 10b is between 3 mm and 5 mm. This configuration reduces turbulence within the lower valve chamber 10b caused by the fluid when the device is operating, thereby reducing noise during operation. Specifically, the diameter of the lower valve chamber 10b may be 3 mm, 5 mm, or 6 mm.

[0024] Furthermore, the height of the second segment 22 is L, where the ratio of L to H is between 0.1 and 0.4. With the above setup, the structural relationship between the guide sleeve 20 and the lower valve chamber 10b can be rationally set, which not only facilitates the processing of the guide sleeve 20 and the lower valve chamber 10b but is also advantageous for the assembly of the guide sleeve 20 and the lower valve chamber 10b. At the same time, it effectively reduces turbulence caused by relatively large vortices that occur when the fluid flows through the lower valve chamber 10b, thereby reducing noise during the operation of the device.

[0025] Specifically, the guide sleeve 20 has cross-sectional structures 23 on both sides, and a balancing passage is provided between the cross-sectional structures 23 and the inner wall of the upper valve chamber 10a. By providing the cross-sectional structures 23, multiple gaps can be formed by matching connection with the lower valve chamber 10b, thereby further improving the noise reduction effect of the electronic expansion valve.

[0026] As shown in Figure 4, another aspect of this application provides an electronic expansion valve including the valve assembly provided in the above embodiment.

[0027] In the technical aspects provided in this application, by inserting the guide sleeve 20 into the lower valve chamber 10b and simultaneously forming a gap between the end of the guide sleeve 20 and the valve opening 14, a balancing passage can be formed between the guide sleeve 20 and the lower valve chamber 10b. This not only ensures that the pressure in the lower valve chamber 10b remains stable when the electronic expansion valve is operating, but also reduces turbulence generated when the fluid flows through the lower valve chamber 10b. In this way, noise during operation of the electronic expansion valve can be effectively reduced, ensuring the normal operation of the electronic expansion valve. At the same time, the guide sleeve 20 is provided with a cross-sectional structure 23, which allows for matching connection with the lower valve chamber 10b and the formation of multiple gaps. In this way, the noise reduction effect of the electronic expansion valve can be further improved.

[0028] As shown in Figures 6 and 7, embodiments of this application provide a valve assembly including a valve seat 10 and a guide sleeve 20. Here, the valve seat 10 has a first valve chamber 11, a second valve chamber 12, and a third valve chamber 13 arranged in a stepped manner, and the valve seat 10 is further provided with a valve opening 14, the valve opening 14 is located at one end of the third valve chamber 13 away from the second valve chamber 12, the guide sleeve 20 is inserted into the first valve chamber 11, the second valve chamber 12, and the third valve chamber 13 and fixedly connected to the valve seat 10, there is a first gap δ1 between the guide sleeve 20 and the inner wall of the first valve chamber 11, a second gap δ2 between the guide sleeve 20 and the inner wall of the second valve chamber 12, and a third gap δ3 between the guide sleeve 20 and the inner wall of the third valve chamber 13, the second gap δ2 is between 1 mm and 2 mm, and the third gap δ3 is between 0.2 mm and 1 mm. By providing the above structure, the valve chamber within the valve seat 10 is arranged in a stepped manner, the guide sleeve 20 is inserted and connected to the valve chamber, and a gap is formed between the inner wall of the valve chamber and the guide sleeve 20. At the same time, the second gap δ2 is set between 1 mm and 2 mm, and the third gap δ3 is set between 0.2 mm and 1 mm, so that the second gap δ2 and the third gap δ3 form a common equalization passage. This not only ensures that the pressure inside the valve chamber is stable, but also reduces the noise of turbulence generated when the fluid flows through the valve chamber, and at the same time reduces the overall volume of the device. In this way, the production cost of the device can be reduced, noise during operation of the electronic expansion valve can be effectively reduced, and the normal operation of the electronic expansion valve can be ensured.

[0029] The technical aspects provided in this application involve providing a stepped valve chamber within the valve seat 10, inserting and connecting the guide sleeve 20 into the valve chamber, and creating a gap between the inner wall of the valve chamber and the guide sleeve. Simultaneously, by utilizing the resonator principle, resonance when the fluid flows through the valve chamber can be reduced, thereby reducing noise during operation of the electronic expansion valve and ensuring the normal operation of the electronic expansion valve.

[0030] Furthermore, the third valve chamber 13 is divided into the upper third valve chamber 131 and the lower third valve chamber 132, and the diameters of the first valve chamber 11, the second valve chamber 12, and the upper third valve chamber 131 decrease sequentially in the direction approaching the valve opening 14. By arranging the valve chambers so that their diameters decrease sequentially, it is advantageous for guiding the guide sleeve 20 during the installation process, thereby facilitating the installation of the guide sleeve 20 and improving installation efficiency.

[0031] As shown in Figure 8, the height of the first valve chamber 11 is H1, the height of the second valve chamber 12 is H2, the height of the third valve chamber 13 is H3, the diameter of the first valve chamber 11 is D3, the diameter of the second valve chamber 12 is D4, and the diameter of the third valve chamber 13 is D5.

[0032] Specifically, the ratio of the diameter D4 of the second valve chamber 12 to the diameter D3 of the first valve chamber 11 is between 0.6 and 0.8. This configuration results in a relatively gradual change in the diameters of the second valve chamber 12 and the first valve chamber 11, facilitating the manufacturing of the valve chambers. Furthermore, based on the resonator principle, the valve chambers gain a certain noise reduction effect.

[0033] Furthermore, the ratio of the diameter D5 of the third valve chamber 13 to the diameter D4 of the second valve chamber 12 is between 0.6 and 0.8. This configuration results in a relatively gradual change in the diameters of the third valve chamber 13 and the second valve chamber 12, facilitating the manufacturing of the valve chambers. Simultaneously, based on the resonator principle, the valve chambers gain a certain noise reduction effect.

[0034] Furthermore, the ratio of the height H2 of the second valve chamber 12 to the height H1 of the first valve chamber 11 is between 0.8 and 1.2. This configuration results in a relatively gradual change in the heights of the second valve chamber 12 and the first valve chamber 11, facilitating the manufacturing of the valve chambers. Simultaneously, based on the resonator principle, the valve chambers gain a certain noise reduction effect.

[0035] Furthermore, the ratio of the height H3 of the third valve chamber 13 to the height H2 of the second valve chamber 12 is between 1.2 and 1.6. This configuration results in a relatively gradual change in the heights of the third valve chamber 13 and the second valve chamber 12, facilitating the manufacturing of the valve chambers. Simultaneously, based on the resonator principle, the valve chambers gain a certain noise reduction effect.

[0036] In this embodiment, the heights of the first valve chamber 11, the second valve chamber 12, and the third valve chamber 13 increase sequentially in the direction approaching the valve opening 14. By arranging the valve chambers so that their heights increase sequentially, it is possible not only to satisfy the requirements for mounting the guide sleeve 20, but also to maximize the fluid flow space within the valve chambers.

[0037] As shown in Figure 3, the first segment 21 has a first rod segment 21a, a second rod segment 21b, and a third rod segment 21c connected in order along the axial direction, with a first gap δ1 formed between the first rod segment 21a and the inner wall of the first valve chamber 11. The guide sleeve 20 is further provided with a cross-sectional structure 23, which is located on the side walls of the second rod segment 21b and the third rod segment 21c, and extends in the axial direction from one end of the second rod segment 21b connected to the first rod segment 21a to the end of the third rod segment 21c. A second gap δ2 is formed between the cross-sectional structure 23 and the inner wall of the second valve chamber 12, and a third gap δ3 is formed between the cross-sectional structure 23 and the inner wall of the third valve chamber 13. In this embodiment, the maximum value of the second gap δ2 is set between 1 mm and 2 mm, and the maximum value of the third gap δ3 is set between 0.2 mm and 1 mm.

[0038] By providing the above structure, the requirement for fixing the guide sleeve 20 and the valve seat 10 can be met by utilizing the cross-sectional structure 23, and a gap can be formed between the guide sleeve 20 and the valve seat 10. Furthermore, the above design is simple in structure, easy to process, and has low manufacturing costs.

[0039] Furthermore, the guide sleeve 20 is provided with two cross-sectional structures 23, which are symmetrically arranged on both sides of the guide sleeve 20. By providing multiple cross-sectional structures 23, multiple gaps can be formed by matching connections with the valve chamber, thereby further improving the noise reduction effect of the electronic expansion valve.

[0040] Furthermore, the first gap δ1 is between 2 mm and 4 mm. By setting it in this way, the noise generated when the fluid flows through the valve chamber can be effectively reduced by utilizing the resonator principle.

[0041] The technical aspects provided in this application involve providing a stepped valve chamber within the valve seat 10, inserting and connecting the guide sleeve 20 to the valve chamber, and forming a gap with the inner wall of the valve chamber. Simultaneously, by utilizing the resonator principle, setting the second gap δ2 between 1 mm and 2 mm and the third gap δ3 between 0.2 mm and 1 mm, the second gap δ2 and the third gap δ3 form a common balancing passage, thereby ensuring that the pressure inside the valve chamber is stable, reducing resonance that occurs when the fluid flows through the valve chamber, and simultaneously reducing the overall volume of the device. In this way, the production cost of the device can be reduced, and the noise of turbulence when the fluid flows through the valve chamber can be effectively reduced, thereby reducing the noise during operation of the electronic expansion valve and ensuring the normal operation of the electronic expansion valve. At the same time, by providing multiple cross-sectional structures 23, multiple gaps can be formed by matching connections with the valve chamber, thereby improving the noise reduction effect of the electronic expansion valve and further reducing the noise during operation of the electronic expansion valve.

[0042] As shown in Figures 9, 7, and 3, the present application provides an electronic expansion valve including a valve assembly, the valve assembly including a valve seat 10 and a guide sleeve 20. Here, the valve seat 10 has sequentially connected first valve chambers 11, 2 valve chambers 12, 3 upper valve chamber 131 and 3 valve chamber 13, the first valve chambers 11, 2 valve chambers 12 and 3 upper valve chamber 131 are arranged in a stepped manner, the valve opening 14 is located at one end of the 3 valve chamber 13 away from the first valve chamber 11, the guide sleeve 20 is inserted into the first valve chamber 11, 2 valve chambers 12, 3 upper valve chamber 131 and 3 main valve chamber 133, the first segment 21 has a first rod segment 21a, a second rod segment 21b and a third rod segment 21c connected sequentially along the axial direction, between the first rod segment 21a and the inner wall of the first valve chamber 11 A first gap is formed, and two cross-sectional structures 23 are symmetrically provided on the side wall of the guide sleeve 20. The cross-sectional structures 23 are located on the side walls of the second rod segment 21b and the third rod segment 21c, and in the axial direction, the cross-sectional structures 23 extend from one end of the second rod segment 21b connected to the first rod segment 21a to the end of the third rod segment 21c. There is a second gap between the cross-sectional structures 23 and the second valve chamber 12 and the upper chamber 131 of the third valve chamber. The first gap, the second gap, and the third valve chamber 13 are in communication with each other, and the ratio of the distance between the two cross-sectional structures 23 to the diameter of the upper chamber 131 of the third valve chamber is between 0.85 and 0.96.

[0043] Here, if the ratio of the distance between the two cross-sectional structures 23 to the diameter of the upper chamber 131 of the third valve chamber is less than 0.85, the gap between the cross-sectional structures 23 and the upper chamber 131 of the third valve chamber becomes larger, increasing the flow rate of the fluid flowing through the balancing passage. If the ratio of the distance between the two cross-sectional structures 23 to the diameter of the upper chamber 131 of the third valve chamber is greater than 0.96, the gap between the cross-sectional structures 23 and the upper chamber 131 of the third valve chamber becomes smaller, decreasing the flow rate of the fluid flowing through the balancing passage. Both of the above settings weaken the pressure buffering effect of the balancing passage and reduce the noise reduction effect of the balancing passage. Therefore, in this application, setting the ratio of the distance between the two cross-sectional structures 23 to the diameter of the upper chamber 131 of the third valve chamber between 0.85 and 0.96 ensures the pressure buffering effect of the balancing passage and improves the noise reduction effect. Specifically, the ratio of the distance between the two cross-sectional structures 23 to the diameter of the upper chamber 131 of the third valve chamber may be 0.85, 0.9, or 0.96.

[0044] By providing the above structure, two cross-sectional structures 23 are provided on the side wall of the guide sleeve 20, and the cross-sectional structures 23 have a gap between them and the second valve chamber 12 and the upper chamber 131 of the third valve chamber. The ratio of the distance between the two cross-sectional structures 23 to the diameter of the upper chamber 131 of the third valve chamber can be set to between 0.85 and 0.96. This gap allows for the formation of a balancing passage between the main chamber 133 of the third valve chamber and the first valve chamber 11, the second valve chamber 12, and the upper chamber 131 of the third valve chamber. Furthermore, the pressure in the main chamber 133 of the third valve chamber and the hole segments can be matched. In addition, pressure fluctuations due to turbulence when the fluid flows through the main chamber 133 of the third valve chamber can be reduced. By reducing such pressure fluctuations through the balancing passage, noise generated when the refrigerant flows through the electronic expansion valve can be reduced, improving the user's comfort experience.

[0045] In the technical aspects provided in this application, two cross-sectional structures 23 are provided on the side wall of the guide sleeve 20, and the first valve chamber 11, the second valve chamber 12, the upper chamber 131 of the third valve chamber and the main chamber 133 of the third valve chamber are arranged in a stepped manner, and a gap is provided between the cross-sectional structure 23 and the upper chamber 131 of the third valve chamber. By utilizing the resonator principle, it is possible not only to match the pressure in the main chamber 133 of the third valve chamber with that of the first valve chamber 11, the second valve chamber 12 and the upper chamber 131 of the third valve chamber, but also to reduce the pressure pulsation that occurs when the fluid flows through the main chamber 133 of the third valve chamber, thereby reducing the noise of the refrigerant flowing through the electronic expansion valve and improving user comfort.

[0046] As shown in Figure 10, the length of the upper chamber 131 of the third valve chamber is L1, the diameter of the upper chamber 131 of the third valve chamber is D6, and the distance between the two cross-sectional structures 23 is S, where L1 = 0.5 * (D6 - S) * (1.2 ~ 3.5). By setting it up in this way, the engagement between the cross-sectional structure 23 and the upper chamber 131 of the third valve chamber becomes more rational by utilizing the resonator principle, reducing noise during the operation of the device, and at the same time, the volume of the guide sleeve 20 is reduced by the cross-sectional structure 23, thereby reducing the production cost of the device. Specifically, the range of values ​​in the above formula may be selected from 1.2, 2, 3, or 3.5.

[0047] Specifically, the second rod segment 21b and the second valve chamber 12 are transition-fit or interference-fit, and the second rod segment 21b is used to limit the relative displacement between the guide sleeve 20 and the valve seat 10. With the above installation, the guide sleeve 20 can be fixedly connected to the valve seat 10, preventing the guide sleeve 20 from being displaced during the operation of the device and ensuring the stability of the device during operation.

[0048] Furthermore, the second rod segment 21b and the third rod segment 21c are provided with a step between them, with the second rod segment 21b corresponding to the second valve chamber 12, and the third rod segment 21c being inserted into the upper chamber 131 and the main chamber 133 of the third valve chamber. Providing the second rod segment 21b and the third rod segment 21c with a step between them, and providing them to correspond to the second valve chamber 12, the upper chamber 131 and the main chamber 133 of the third valve chamber respectively, is advantageous for guiding the guide sleeve 20 during the installation process, making it easier to install the guide sleeve 20 and improving assembly efficiency.

[0049] Specifically, the diameter of the third valve chamber main chamber 133 is smaller than the diameter of the third valve chamber upper chamber 131. In this way, resonance that occurs when the fluid flows through the third valve chamber main chamber 133 is reduced, thereby reducing noise during the operation of the device.

[0050] As shown in Figure 11, the diameter of the third rod segment 21c is d1. The proportional relationship between the diameter d1 of the third rod segment 21c and the diameter of the upper chamber 131 of the third valve chamber is between 0.85 and 1. This configuration creates a gap between the third rod segment 21c and the upper chamber 131 of the third valve chamber, and at the same time, based on the resonator principle, further improves the noise reduction effect of this device. If the proportional relationship between the third rod segment 21c and the upper chamber 131 of the third valve chamber is set to less than 0.85 or greater than 1, the airflow noise when the fluid flows through the gap increases, affecting the noise reduction effect of the device.

[0051] Specifically, the gap between the first rod segment 21a and the first valve chamber 11 is between 2 mm and 4 mm, and the gap between the cross-sectional structure 23 and the second valve chamber 12 is between 1 mm and 2 mm. In this way, the above gaps can be made to form a common balancing passage, ensuring that the pressure within the hole segment becomes stable, and at the same time, the pressure pulsation that occurs when the fluid flows through the third valve chamber main chamber 133 is also reduced, further improving the noise reduction effect of the device. In this embodiment, the gap between the first rod segment 21a and the first valve chamber 11 may specifically be 2 mm, 3 mm, or 4 mm. The gap between the cross-sectional structure 23 and the second valve chamber 12 may specifically be 1 mm, 1.5 mm, or 2 mm.

[0052] Furthermore, the electronic expansion valve further includes a casing 30, a nut sleeve 40, a screw 50, and a spindle assembly 60. Here, the casing 30 is connected to the valve seat 10, and there is a housing chamber 31 between the casing 30 and the valve seat 10. The nut sleeve 40 is provided in the housing chamber 31, the screw 50 is movably provided in the housing chamber 31, the screw 50 is inserted into and screwed into the nut sleeve 40, the spindle assembly 60 is movably provided in the guide sleeve 20, one end of the spindle assembly 60 is connected to the screw 50, and the screw 50 drives the spindle assembly 60 to move so as to open or close the valve port 14. The movement of the spindle assembly 60 between the open and closed positions allows the housing chamber 31 to communicate with the third valve chamber main chamber 133, and at the same time, the pressures in the housing chamber 31 and the third valve chamber main chamber 133 can be matched, ensuring the stability of the device during operation.

[0053] According to the technical aspects provided in this application, two cross-sectional structures 23 are provided on the side wall of the guide sleeve 20, and the first valve chamber 11, second valve chamber 12, third valve chamber upper chamber 131, and third valve chamber main chamber 133 are arranged in a stepped manner, with a gap between the cross-sectional structure 23 and the third valve chamber upper chamber 131. By utilizing the resonator principle, the pressures of the third valve chamber main chamber 133 and the first valve chamber 11, second valve chamber 12, and third valve chamber upper chamber 131 are matched, thereby forming a pressure buffer chamber within the housing chamber 31. At the same time, pressure fluctuations due to turbulence when the fluid flows through the third valve chamber main chamber 133 can be reduced. The balancing passage and housing chamber 31 reduce such pressure fluctuations, thereby reducing noise generated when the refrigerant flows through the electronic expansion valve, ensuring the normal operation of the electronic expansion valve and improving the user's comfort experience. At the same time, the second rod segment 21b and the second valve chamber 12 are transition-fit or interference-fit, allowing the guide sleeve 20 to be fixedly connected to the valve seat 10, preventing the guide sleeve 20 from being displaced during the operation of the device and ensuring the stability of the device during operation.

[0054] As shown in Figures 12 to 15, the valve seat 10 has a first valve chamber 11, a second valve chamber 12, and a third valve chamber 13 arranged in a stepped manner, the valve opening 14 is located at one end of the third valve chamber 13 away from the second valve chamber 12, a first connection hole 15 is provided in the side wall of the valve seat 10, and a second connection hole 16 is provided at the end of the valve seat, the first connection hole 15 is in communication with the third valve chamber 13 and the second connection hole 16 is in communication with the valve opening 14 Furthermore, the axis of the first connection hole 15 and the axis of the third valve chamber 13 are perpendicular to each other, the axis of the second connection hole 16 and the axis of the third valve chamber 13 overlap, the end of the first connection hole 15 is located on the inner wall of the third valve chamber 13, and the end of the first connection hole 15 has a first straight hole segment 151 and a first tapered hole segment 152 which are connected to each other, and the taper angle of the first tapered hole segment 152 is between 80° and 170°. Specifically, the taper angle of the first tapered hole segment 152 may be 80°, 100°, or 170°. As shown in Figure 12, the taper angle of the first tapered hole segment 152 is indicated as A.

[0055] Here, if the taper angle of the first tapered hole segment 152 is less than 80°, the volume of the first connection hole 15 is reduced, and at this time, the flow rate of the fluid flowing through the first connection hole 15 is also reduced. If the taper angle of the first tapered hole segment 152 is greater than 170°, the volume of the first connection hole 15 is increased, and at this time, the flow rate of the fluid flowing through the first connection hole 15 is also increased. Both of the above settings weaken the noise reduction effect of the first connection hole 15. Therefore, in this application, by setting the taper angle of the first tapered hole segment 152 between 80° and 170°, it is possible to ensure the buffering effect of the refrigerant passing through the first connection hole 15 and improve the noise reduction effect.

[0056] By providing the above structure, a first connection hole 15 is provided in the side wall of the valve seat, and the axis of the first connection hole 15 is perpendicular to the axis of the third valve chamber 13, allowing fluid to flow into the first connection hole 15 when the device is in operation. At the same time, the first connection hole 15 includes a first tapered hole segment 152, and the taper angle of the first tapered hole segment 152 is between 80° and 170°, and the taper angle can provide a buffering effect on the fluid. In this way, noise during operation of the electronic expansion valve can be effectively reduced, ensuring the normal use of the electronic expansion valve.

[0057] Furthermore, the third valve chamber 13 has a third valve chamber upper chamber 131, a third valve chamber main chamber 133, and a third valve chamber lower chamber 132 arranged sequentially along the axis, with the valve port 14 located at the end of the third valve chamber lower chamber 132 away from the third valve chamber upper chamber 131, and the first connection hole 15 portion located within the third valve chamber main chamber 133. In this way, the fluid flowing in the third valve chamber 13 is separated into gas and liquid, and the fluid is discharged through the valve port 14, reducing contact between the fluid and the inner wall of the third valve chamber 13, thereby reducing noise during the operation of the device. With the above setup, when the fluid flows from the first connection hole 15 to the third valve chamber 13, the fluid and the gas in the third valve chamber 13 are separated, and under the action of gravity, as much liquid as possible flows into the third valve chamber lower chamber 132, weakening the discontinuous noise when the two-phase refrigerant flows into the valve port, and further achieving the objective of reducing noise.

[0058] As shown in Figure 12, the height of the lower chamber 132 of the third valve chamber is indicated as H4. Specifically, the height of the lower chamber 132 of the third valve chamber is between 0.3 mm and 4 mm. If the height of the lower chamber 132 of the third valve chamber is less than 0.3 mm, it reduces the effect of gas-liquid phase separation of the fluid and affects the noise reduction effect of the third valve chamber 13. If the height of the lower chamber 132 of the third valve chamber is greater than 4 mm, it increases the volume of the third valve chamber 13 accordingly, increasing the production cost of the third valve chamber 13. Therefore, in this application, setting the height of the lower chamber 132 of the third valve chamber between 0.3 mm and 4 mm ensures the noise reduction effect of the third valve chamber 13 while simultaneously reducing the volume of the third valve chamber 13 as much as possible. Specifically, the height of the lower chamber 132 of the third valve chamber may be 0.3 mm, 2 mm, or 4 mm.

[0059] As shown in Figure 12, the length of the first straight-hole segment 151 is indicated as L2. Furthermore, the length of the first straight-hole segment 151 is set between 0.3 mm and 3 mm. Here, if the length of the first straight-hole segment 151 is less than 0.3 mm, the buffering effect of the first straight-hole segment 151 that generates turbulence in the fluid is weakened. If the length of the first straight-hole segment 151 is greater than 3 mm, the length of the first straight-hole segment 151 is increased accordingly, which thins the side wall of the valve body and reduces the structural strength of the valve seat. Therefore, in this application, setting the length of the first straight-hole segment 151 between 0.3 mm and 3 mm reduces the turbulence generated when the fluid flows into the first straight-hole segment 151, thereby reducing the fluid velocity in the first straight-hole segment 151. This reduces the impact of the fluid on the inner wall of the third valve chamber 13, further improving the noise reduction effect of the device and ensuring the overall structural strength of the device. Specifically, the length of the first straight-hole segment 151 is 0.3 mm, 2 mm, or 3 mm.

[0060] Specifically, the ratio of the height of the lower chamber 132 of the third valve chamber to the diameter of the first straight-hole segment 151 is between 0.05 and 0.5. In this way, the engagement between the lower chamber 132 of the third valve chamber and the first straight-hole segment 151 becomes more rational, reducing the impact of the fluid on the inner wall of the third valve chamber, while simultaneously improving the structural strength of the third valve chamber 13.

[0061] Furthermore, the first tapered bore segment 152 has a first end and a second end that are opposite each other, with the first end connected to the first straight bore segment 151, and the diameter of the first end and the diameter of the first straight bore segment 151 are the same. In this way, fluid can be allowed to flow from the third valve chamber 13 into the first tapered bore segment 152, and because the first tapered bore segment 152 has a buffering effect, the fluid velocity can be effectively reduced, further reducing noise during the operation of the device.

[0062] As shown in Figure 13, in another example of this application, the first tapered bore segment 152 has opposing first and second ends, the first end being connected to the first straight bore segment 151, and the diameter of the first end is smaller than the diameter of the first straight bore segment 151. In this way, the first tapered bore segment 152 and the first straight bore segment 151 can be engaged and used, improving the structural consistency of the first connecting hole 15 and ensuring stability during operation of the device.

[0063] As shown in Figure 14, in another example of this application, the first connecting hole 15 further includes a second straight-hole segment 153, the first straight-hole segment 151, the second straight-hole segment 153 and the first tapered-hole segment 152 are sequentially connected, and the diameter of the second straight-hole segment 153 is smaller than the diameter of the first straight-hole segment 151, and the first tapered-hole segment 152 includes a first end and a second end provided opposite each other, the first end being connected to the second straight-hole segment 153, and the diameter of the first end being the same as the diameter of the second straight-hole segment 153. In this way, the transition of the first straight-hole segment 151 can be made smoother, further reducing noise during the operation of the device.

[0064] In another example of this application, the first connecting hole 15 further includes a second tapered hole segment 154, and the first straight hole segment 151, the second tapered hole segment 154, and the first tapered hole segment 152 are sequentially connected. In another embodiment, the taper angle of the second tapered hole segment 154 is set between 70° and 170°, so as to facilitate the user selecting different valve seats according to different operating environments and improve the applicability of the device. As shown in Figure 15, the taper angle of the second tapered hole segment 154 is indicated as B. Specifically, the taper angle of the second tapered hole segment 154 may be 70°, 90°, or 170°.

[0065] As shown in Figures 16 to 18, the valve seat is provided with a first connection port 17 and a second connection port 18. The first connection port 17 communicates with the lower valve chamber 10b. The valve seat is further provided with a valve opening 14 and a first transition hole segment 141 that communicate sequentially. Specifically, the valve opening 14 communicates with the third valve chamber 13. The first transition hole segment 141 has opposing first ends 1411 and second ends 1412. The first end 1411 communicates with the valve opening 14, and the second end 1412 communicates with the second connection port 18. The first transition hole segment 141 has a tapered structure, with the diameter of the first end 1411 being smaller than the diameter of the second end 1412, and the taper angle of the first transition hole segment 141 is between 15° and 60°. Specifically, the taper angle of the first transition hole segment 141 is a, where a may be 15°, 45°, or 60°. In this embodiment, a is 30°.

[0066] In the technical aspects of this application, the valve seat includes a third valve chamber 13, a first connection port 17, a second connection port 18, a valve port 14, and a first transition hole segment 141. Here, the first transition hole segment 141 has a tapered structure, and the diameter of the hole at the first end 1411 is smaller than the diameter of the hole at the second end 1412. In this way, the diameter of the fluid passage is gradually increased, significantly reducing situations in which sudden changes occur. At the same time, the volume of the first transition hole segment is increased, which reduces the generation of fluid vortices and turbulence, allowing the fluid to flow slowly and stably, and thus reducing the generation of fluid noise. Furthermore, the above structure can reduce the resistance generated in the flow passage.

[0067] Here, if the taper angle of the first transition hole segment 141 is less than 15°, the angle is too small, making it easy for relatively large abrupt changes to occur when the fluid flows in, resulting in poor transition properties, increased turbulence, and potentially noise generation during the fluid flow process. If the taper angle of the first transition hole segment 141 is greater than 60°, the draining effect of the inner wall of the first transition hole segment 141 on the fluid is weakened, and furthermore, the fluid cannot be buffered. Therefore, setting the taper angle of the first transition hole segment 141 between 15° and 60° allows for good draining and buffering effects on the fluid.

[0068] Specifically, the diameter of the first transition hole segment 141 is greater than or equal to the diameter of the valve opening 14. When the volume of the first transition hole segment 141 is greater than the volume of the valve opening 14, the flow rate is increased, ensuring the smoothness and stability of the fluid flow, and further reducing the generation of fluid vortices and turbulence. When the diameter of the first transition hole segment 141 is smaller than the diameter of the valve opening 14, the diameter decreases rapidly as the fluid flows, causing changes in the fluid pressure and velocity, making vortices and turbulence very likely to occur, and also generating fluid noise.

[0069] Specifically, the bore diameter of the first end 1411 is between 2.5 mm and 5 mm. If the bore diameter of the first end 1411 is smaller than 2.5 mm, fluid tends to accumulate in the first end 1411, making it difficult for the fluid to flow and increasing the likelihood of noise generation. If the bore diameter of the first end 1411 is larger than 5 mm, the first transition hole segment 141 is designed with a tapered structure, and the first end 1411 becomes too large, resulting in an excessively large first transition hole segment 141, increasing the volume of the valve seat and making the valve seat difficult to use. Specifically, the bore diameter of the first end 1411 is D7, and D7 may be 2.5 mm, 3.5 mm, or 5 mm. In this embodiment, D7 is 4 mm.

[0070] Specifically, the axial length of the first transition hole segment 141 is between 0.8 mm and 5 mm. If the axial length of the first transition hole segment 141 is less than 0.8 mm, the reservoir of the first transition hole segment 141 becomes smaller, and it is not possible to store a relatively large amount of fluid, causing fluid accumulation, which changes the fluid velocity and pressure, and furthermore, easily generates vortices and turbulence. If the length of the first transition hole segment 141 is greater than 5 mm, the overall size of the valve seat is relatively large. Therefore, by setting the axial length of the first transition hole segment 141 between 0.8 mm and 5 mm, the valve seat satisfies the requirements of reducing vortices and turbulence and noise, while simultaneously minimizing the overall size of the valve seat. Specifically, the axial length of the first transition hole segment 141 is H5, and H5 may be 0.8 mm, 3 mm, or 5 mm. In this embodiment, H5 is 4 mm.

[0071] Furthermore, the valve seat is further provided with a second transition hole segment 142, one end of which is in communication with the second end 1412, and a second connection port 18 is formed at the other end of the second transition hole segment 142. With the second transition hole segment 142 in communication with the second end 1412, the fluid flows through the first transition hole segment 141 and then enters the second transition hole segment 142. The fluid velocity and pressure can be further controlled using the second transition hole segment 142 to ensure smooth fluid flow, and the fluid can then flow through the second transition hole segment 142 and then stably and smoothly out through the second connection port 18.

[0072] In this embodiment, the diameter of the second transition hole segment 142 is the same along the axial direction, that is, the second transition hole segment 142 is designed as a cylindrical hole, and the cylindrical shape helps maintain the fluid velocity and pressure, making the fluid flow smoother and further reducing the generation of turbulence and eddies.

[0073] Here, the diameter of the second transition hole segment 142 may be equal to the diameter of the second end 1412, or it may be larger than the diameter of the second end 1412. In this embodiment, the diameter of the second transition hole segment 142 is equal to the diameter of the second end 1412, and in this way, a sudden change in diameter is avoided when the fluid flows from the second end 1412 to the second transition hole segment 142, making the fluid flow smoother.

[0074] Furthermore, the outer diameter of the second transition hole segment 142 is smaller than the outer diameter of the first transition hole segment 141. In this way, the connection between the external pipeline and the second connection port 18 is facilitated, and the external pipeline can be smoothly inserted into the second connection port 18, ensuring connection stability between the two.

[0075] Specifically, the axial length of the valve port 14 is between 0.5 mm and 2 mm, and the above installation ensures coaxiality between the spindle and the valve port 14. If the axial length of the valve port 14 is less than 0.5 mm, the spindle is prone to wear against the valve port 14 during its up-and-down movement, thus reducing the spindle's service life. If the axial length of the valve port 14 is greater than 2 mm, the velocity of the fluid flowing through the valve port 14 is affected, causing a relatively large pressure drop after the fluid reaches the seal line of the valve port 14, affecting the smoothness of the fluid flow. Therefore, in this application, the axial length of the valve port 14 is set to between 0.5 mm and 2 mm to ensure coaxiality between the spindle and the valve port 14, while simultaneously reducing spindle wear, extending the spindle's service life, and ensuring smooth fluid flow. Specifically, the axial length of the valve port 14 is H6, where H6 may be 0.5 mm, 1 mm, or 2 mm. In this embodiment, H6 is 1.5 mm.

[0076] Furthermore, chamfers are drilled at both ends of the valve port 14. This design effectively removes burrs from the flange generated during the machining of the valve port 14, thereby avoiding noise generation when fluid flows through the valve port 14.

[0077] Specifically, the chamfer size may be designed between C0.05mm and C0.15mm. If the chamfer size is C0.05mm smaller, burrs on the flange cannot be effectively removed, and relatively loud noise is generated when the fluid flows through the valve port 14. If the chamfer size is larger than C0.15mm, the length of the valve port 14 decreases, and furthermore, the coaxiality between the valve port 14 and the spindle is affected. Therefore, setting the chamfer size between C0.05mm and C0.15mm allows for effective removal of burrs while ensuring coaxiality between the valve port 14 and the spindle, thereby reducing noise generated when the fluid flows through the valve port 14. Specifically, the chamfer size may be C0.05mm, C0.1mm, or C0.15mm.

[0078] In this technical embodiment, a first transition hole segment 141 is designed below the valve port 14, which reduces resistance due to abrupt changes in the cross-sectional area of ​​the flow passage, ensuring smooth fluid flow and reducing the generation of eddies and turbulence. Below the first transition hole segment 141, a second transition hole segment 142 is designed with the same hole diameter as the second end 1412, which maintains a stable fluid flow and makes the flow smoother.

[0079] It should be noted that the terminology used herein is solely for the purpose of describing specific embodiments and is not intended to limit the exemplary embodiments provided herein. Unless otherwise clearly indicated in the context, the singular form is intended to include the plural form, and furthermore, where the terms “include” and / or “contain” are used herein, it should be understood that they also indicate the presence of features, steps, operations, devices, assemblies and / or combinations thereof.

[0080] Unless otherwise specifically stated, the relative arrangements, formulas, and numerical values ​​of the components and steps described in these embodiments do not limit the scope of this application. At the same time, for the sake of descriptive convenience, it should be understood that the dimensions of the parts shown in the drawings are not drawn according to actual proportional relationships. While we do not discuss in detail the art, methods, and equipment known to those skilled in the art, where appropriate, the art, methods, and equipment described should be considered part of the permitted specification. In all the examples shown and discussed herein, any specific values ​​are merely illustrative and should not be interpreted as limiting. Accordingly, other examples in the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters indicate similar elements in subsequent drawings, and therefore, once an element is defined in one drawing, no further explanation is required for it in subsequent drawings.

[0081] In the description of this application, directions or positional relationships indicated by directional terms such as "front," "back," "up," "down," "left," "right," "lateral," "vertical," "horizontal," and "top" and "bottom" are usually directions or positional relationships based on the illustrations and are merely for the convenience and simplification of the description in this application. Unless otherwise stated, these directional terms do not indicate or imply that the specified device or element has a particular direction or must be configured and operated in a particular direction, and should not be understood as limiting the scope of protection of this application. The directional terms "inside" and "outside" should be understood as meaning inside and outside with respect to the contour of each component itself.

[0082] For convenience of description, spatially relative terms such as "on top of," "above," "on the top surface," and "on the top surface" may be used here to describe the spatial positional relationship between one illustrated device or feature and another device or feature. Spatially relative terms should be understood as intended to include different orientations of the device in use or operation, in addition to the orientation described in the drawing. For example, if the device in the drawing is reversed, a device described as "above another device or structure" or "on top of another device or structure" will subsequently be positioned as "below another device or structure" or "below another device or structure." Thus, the exemplary term "above" may include both the orientations of "above" and "below." The device may be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here may be interpreted accordingly.

[0083] Furthermore, it should be explained that the use of words such as "first," "second," etc., to specify parts is simply to easily distinguish corresponding parts, and unless otherwise stated, the aforementioned words do not have any special meaning and should not be understood as limiting the scope of protection of this application.

[0084] The foregoing describes preferred embodiments of this application and is not intended to limit it. Those skilled in the art will know that this application is subject to various modifications and changes. Any modifications, equivalent substitutions, improvements, etc., made within the scope of the intent and principles of this application should be included within the scope of protection of this application.

Claims

1. A valve seat (10) having an upper valve chamber (10a) and a lower valve chamber (10b) that are sequentially connected, and a valve opening (14) located at one end of the lower valve chamber (10b) away from the upper valve chamber (10a), The valve seat (10) includes a guide sleeve (20) provided within it and inserted into the upper valve chamber (10a) and the lower valve chamber (10b), The distance between the end of the guide sleeve (20) adjacent to the valve opening (14) and the valve opening (14) is H, and the diameter of the lower valve chamber (10b) is D, where the ratio of H to D is between 0.4 and 0.

6. Valve assembly.

2. The guide sleeve (20) includes the third rod segment (21c) and the second segment (22) of the first segment (21), The third rod segment (21c) and the second segment (22) are arranged in a stepped manner. The valve assembly according to claim 1, wherein the diameter of the third rod segment (21c) is greater than the diameter of the second segment (22).

3. The valve assembly according to claim 2, wherein the ratio of the diameter of the second segment (22) to the diameter of the lower valve chamber (10b) is between 0.5 and 0.

8.

4. The valve assembly according to claim 2, wherein the ratio of the diameter of the third rod segment (21c) to the diameter of the lower valve chamber (10b) is between 0.8 and 1.

5. The valve assembly according to claim 1, wherein the diameter of the lower valve chamber (10b) is between 3 mm and 6 mm.

6. The valve assembly according to claim 2, wherein the height of the second segment (22) is L, and the ratio of L to H is between 0.1 and 0.

4.

7. The guide sleeve (20) has a cross-sectional structure (23) on both sides, The valve assembly according to claim 1, wherein a balancing passage is provided between the cross-sectional structure (23) and the inner wall of the upper valve chamber (10a).

8. The valve seat (10) has a first valve chamber (11), a second valve chamber (12), and a third valve chamber (13) arranged in a stepped manner, The valve opening (14) is located at one end of the third valve chamber (13) away from the second valve chamber (12), The guide sleeve (20) is inserted into the first valve chamber (11), the second valve chamber (12), and the third valve chamber (13), and is fixedly connected to the valve seat (10). There is a first gap between the guide sleeve (20) and the inner wall of the first valve chamber (11), There is a second gap between the guide sleeve (20) and the inner wall of the second valve chamber (12), There is a third gap between the guide sleeve (20) and the inner wall of the third valve chamber (13), The second gap is between 1 mm and 2 mm. The valve assembly according to claim 2, wherein the third gap is between 0.2 mm and 1 mm.

9. The third valve chamber (13) includes a third valve chamber upper chamber (131), a third valve chamber main chamber (133), and a third valve chamber lower chamber (132) that are sequentially connected to each other. The valve assembly according to claim 8, wherein the diameters of the first valve chamber (11), the second valve chamber (12), and the upper chamber (131) of the third valve chamber are sequentially smaller in the direction approaching the valve opening (14).

10. The valve assembly according to claim 9, wherein the ratio of the diameter of the second valve chamber (12) to the diameter of the first valve chamber (11) is between 0.6 and 0.

8.

11. The valve assembly according to claim 9, wherein the ratio of the diameter of the third valve chamber (13) to the diameter of the second valve chamber (12) is between 0.6 and 0.

8.

12. The valve assembly according to claim 8, wherein the heights of the first valve chamber (11), the second valve chamber (12), and the third valve chamber (13) increase in order toward the direction approaching the valve opening (14).

13. The valve assembly according to claim 8, wherein the ratio of the height of the second valve chamber (12) to the height of the first valve chamber (11) is between 0.8 and 1.

2.

14. The valve assembly according to claim 8, wherein the ratio of the height of the third valve chamber (13) to the height of the second valve chamber (12) is between 1.2 and 1.

6.

15. The first segment (21) has a first rod segment (21a), a second rod segment (21b), and a third rod segment (21c) connected in order along the axial direction. A first gap is formed between the first rod segment (21a) and the inner wall of the first valve chamber (11). The guide sleeve (20) is further provided with a cross-sectional structure (23), The cross-sectional structure (23) is located on the side walls of the second rod segment (21b) and the third rod segment (21c), and extends in the axial direction from one end of the second rod segment (21b) connected to the first rod segment (21a) to the end of the third rod segment (21c). A second gap is formed between the cross-sectional structure (23) and the inner wall of the second valve chamber (12). The valve assembly according to claim 9, wherein the third gap is formed between the cross-sectional structure (23) and the inner wall of the third valve chamber (13).

16. The guide sleeve (20) is provided with two of the cross-sectional structures (23), The valve assembly according to claim 15, wherein the two cross-sectional structures (23) are provided symmetrically on both sides of the guide sleeve (20).

17. The first gap, the second gap, and the third valve chamber (13) are in communication with each other. The valve assembly according to claim 16, wherein the ratio of the distance between the two cross-sectional structures (23) to the diameter of the third valve chamber upper chamber (131) is between 0.85 and 0.

96.

18. The length of the upper chamber (131) of the third valve chamber is L1, the diameter of the upper chamber (131) of the third valve chamber is D6, and the distance between the two cross-sectional structures (23) is S. The valve assembly according to claim 17, wherein L1 = 0.5 * (D6 - S) * (1.2 to 3.5).

19. The second rod segment (21b) and the second valve chamber (12) are transition fit or interference fit. The valve assembly according to claim 17, wherein the second rod segment (21b) is used to limit the relative displacement between the guide sleeve (20) and the valve seat (10).

20. The second rod segment (21b) and the third rod segment (21c) are arranged in a stepped manner. The second rod segment (21b) is provided corresponding to the second valve chamber (12), The valve assembly according to claim 17, wherein the third rod segment (21c) is inserted into the upper chamber (131) and the main chamber (133) of the third valve chamber.

21. The valve assembly according to claim 17, wherein the diameter of the third valve chamber main chamber (133) is smaller than the diameter of the third valve chamber upper chamber (131).

22. The valve assembly according to claim 17, wherein the proportional relationship between the diameter of the third rod segment (21c) and the diameter of the upper chamber (131) of the third valve chamber is between 0.85 and 1.

23. The gap between the first rod segment (21a) and the first valve chamber (11) is between 2 mm and 4 mm. The valve assembly according to claim 17, wherein the gap between the cross-sectional structure (23) and the second valve chamber (12) is between 1 mm and 2 mm.

24. The valve seat (10) has a first valve chamber (11), a second valve chamber (12), and a third valve chamber (13) arranged in a stepped manner, The valve opening (14) is located at one end of the third valve chamber (13) away from the second valve chamber (12), A first connection hole (15) is provided in the side wall of the valve seat (10). A second connecting hole (16) is provided at the end of the valve seat. The first connection hole (15) is in communication with the third valve chamber (13), The second connection hole (16) is in communication with the valve opening (14), The axis of the first connection hole (15) and the axis of the third valve chamber (13) are perpendicular to each other. The axis of the second connection hole (16) and the axis of the third valve chamber (13) overlap. The end of the first connection hole (15) is located on the inner wall of the third valve chamber (13), The end of the first connecting hole (15) has a first straight hole segment (151) and a first tapered hole segment (152) that are connected to each other. The valve assembly according to claim 1, wherein the taper angle of the first tapered bore segment (152) is between 80° and 170°.

25. The third valve chamber (13) has a third valve chamber upper chamber (131), a third valve chamber main chamber (133), and a third valve chamber lower chamber (132) arranged sequentially along the axis. The valve opening (14) is located at the end of the lower chamber (132) of the third valve chamber that is away from the upper chamber (131) of the third valve chamber. The valve assembly according to claim 24, wherein the first connection hole (15) portion is located within the third valve chamber main chamber (133).

26. The valve assembly according to claim 25, wherein the height of the lower chamber (132) of the third valve chamber is between 0.3 mm and 4 mm.

27. The valve assembly according to claim 24, wherein the length of the first straight-hole segment (151) is between 0.3 mm and 3 mm.

28. The valve assembly according to claim 25, wherein the ratio of the height of the lower chamber of the third valve chamber (132) to the diameter of the first straight-hole segment (151) is between 0.05 and 0.

5.

29. The first tapered bore segment (152) has a first end and a second end that are provided opposite to each other. The first end is connected to the first straight-hole segment (151), The valve assembly according to claim 24, wherein the diameter of the first end is the same as the diameter of the first straight-hole segment (151).

30. The first tapered bore segment (152) has a first end and a second end that are provided opposite to each other. The first end is connected to the first straight-hole segment (151), The valve assembly according to claim 24, wherein the diameter of the first end is smaller than the diameter of the first straight-hole segment (151).

31. The first connecting hole (15) further includes a second straight-hole segment (153), The first straight-hole segment (151), the second straight-hole segment (153), and the first tapered-hole segment (152) are sequentially connected, and the diameter of the second straight-hole segment (153) is smaller than the diameter of the first straight-hole segment (151). The first tapered bore segment (152) has a first end and a second end that are provided opposite to each other. The first end is connected to the second straight-hole segment (153), The valve assembly according to claim 24, wherein the diameter of the first end is the same as the diameter of the second straight-hole segment (153).

32. The first connecting hole (15) further includes a second tapered hole segment (154), The valve assembly according to claim 24, wherein the first straight-hole segment (151), the second tapered-hole segment (154), and the first tapered-hole segment (152) are sequentially connected.

33. The valve seat is provided with a first connection port (17) and a second connection port (18). The first connection port (17) is in communication with the lower valve chamber (10b), The valve seat is further provided with a first transition hole segment (141), The first transition hole segment (141) is sequentially connected to the valve opening (14), The first transition hole segment (141) has a first end (1411) and a second end (1412) that are provided opposite to each other. The first end (1411) is in communication with the valve opening (14), The second end (1412) is in communication with the second connection port (18), The first transition pore segment (141) has a tapered structure, The diameter of the hole at the first end (1411) is smaller than the diameter of the hole at the second end (1412). The valve assembly according to claim 1, wherein the taper angle of the first transition hole segment (141) is between 15° and 60°.

34. The valve assembly according to claim 33, wherein the diameter of the first transition hole segment (141) is greater than or equal to the diameter of the valve opening (14).

35. The valve assembly according to claim 33, wherein the diameter of the hole at the first end (1411) is between 2.5 mm and 5 mm.

36. The valve assembly according to claim 33, wherein the length of the first transition hole segment (141) along the axial direction is between 0.8 mm and 5 mm.

37. The valve seat is further provided with a second transition hole segment (142), One end of the second transition hole segment (142) is in communication with the second end (1412), The valve assembly according to claim 33, wherein the second connection port (18) is formed at the other end of the second transition hole segment (142).

38. The valve assembly according to claim 37, wherein the hole diameter along the axial direction of the second transition hole segment (142) is the same.

39. The valve assembly according to claim 37, wherein the diameter of the second transition hole segment (142) is equal to the diameter of the second end (1412).

40. The valve assembly according to claim 37, wherein the outer diameter of the second transition hole segment (142) is smaller than the outer diameter of the first transition hole segment (141).

41. The valve assembly according to claim 33, wherein the length of the valve opening (14) along the axial direction is between 0.5 mm and 2 mm.

42. The valve assembly according to claim 33, wherein chamfers are provided at both ends of the valve opening (14).

43. The valve assembly according to claim 42, wherein the chamfer size is between C0.05 mm and C0.15 mm.

44. An electronic expansion valve comprising a valve assembly according to any one of claims 1 to 43.

Images