Electronic expansion valve

Abstract

The present application provides an electronic expansion valve, which includes a valve housing, a nut sleeve, a screw, a spindle assembly and a pressure spring, the valve housing has a receiving chamber and a valve port, the valve port communicates with the receiving chamber, the nut sleeve is disposed in the receiving chamber, the nut sleeve is fixedly connected to the valve housing, the screw has a first end and a second end disposed opposite to each other, is inserted into the nut sleeve and screwed into the nut sleeve, the spindle assembly is disposed corresponding to the valve port, the second end of the screw is connected to the spindle assembly, the screw drives the spindle assembly to seal or open the valve port, and the pressure spring is disposed between the spindle assembly and the nut sleeve, so that the screw thread and the nut sleeve thread can be tightly fitted to each other. The technical aspects provided by the present application solve the problem of low flow rate control accuracy of the electronic expansion valve in the prior art.

Description

Technical Field

[0001] This application claims the priority of a patent application with application number 202220573034.X, filed with the China National Intellectual Property Administration on March 16, 2022, and the title of the application being Electric Valve, the priority of a patent application with application number 202220586991.6, filed with the China National Intellectual Property Administration on March 17, 2022, and the title of the application being Electric Valve, and the priority of a patent application with application number 202220654238.6, filed with the China National Intellectual Property Administration on March 24, 2022, and the title of the application being Electronic Expansion Valve.

[0002] This application relates to the technical field of control valves, specifically to electronic expansion valves.

Background Art

[0003] Currently, in general, an electronic expansion valve is provided with a nut sleeve and a screw in the accommodation chamber of the valve housing. The screw is screwed into the nut sleeve, the spindle is connected to the screw, and the screw drives the spindle to seal or open the valve port. However, there is a gap at the screwing position between the nut sleeve and the screw. When the screw moves upward relative to the nut sleeve, the upper surface of the thread of the nut sleeve contacts the upper surface of the thread of the screw. When the screw moves downward relative to the nut sleeve, the lower surface of the thread of the nut sleeve contacts the lower surface of the thread of the screw. Thus, when the screw moves up and down, if the screw rotates to the same position relative to the nut sleeve, the position of the screw relative to the nut sleeve is affected by screw play and an error occurs. As a result, an error occurs in the position of the spindle relative to the valve port, and furthermore, the accuracy of the flow control of the electronic expansion valve decreases.

Summary of the Invention

[0004] This application provides an electronic expansion valve to solve the problem of low accuracy in flow control of electronic expansion valves in the prior art.

[0005] This application provides an electronic expansion valve comprising a valve housing, a nut sleeve, a screw, a spindle assembly, and a pressure spring, wherein the valve housing has a housing chamber and a valve port, the valve port communicating with the housing chamber; the nut sleeve is provided within the housing chamber and is fixedly connected to the valve housing; the screw has a first end and a second end provided opposite to each other and is inserted into and screwed into the nut sleeve; the spindle assembly is provided corresponding to the valve port, the second end of the screw is connected to the spindle assembly, the screw drives the spindle assembly to seal or open the valve port; and the pressure spring is provided between the spindle assembly and the nut sleeve, and can tightly seal the threads of the screw and the threads of the nut sleeve. By using a pressure spring, the position of the screw relative to the nut sleeve can be made unaffected by screw play during the upward and downward movement of the screw. This ensures that the degree to which the valve port of the spindle assembly opens during the upward and downward movement of the screw is unaffected by screw play, and furthermore, that the accuracy of flow control of the electronic expansion valve is improved.

[0006] Furthermore, the nut sleeve has a first through-hole extending axially, the first through-hole including a threaded segment and a guide segment, the threaded segment being spaced apart from the valve opening, and a guide ring connected to at least a portion of the valve housing being provided inside the guide segment, with both ends of the pressure spring in contact with the guide ring and the spindle assembly, respectively.

[0007] Furthermore, the spindle assembly includes a first segment and a second segment, the outer diameter of the first segment of the spindle assembly being smaller than the outer diameter of the second segment of the spindle assembly, the second segment being positioned close to the valve opening, the first segment being connected to the second end of the screw and movably mounted within the guide ring, and the pressure spring being fitted to the outside of the first segment of the spindle assembly, one end of the pressure spring contacting the guide ring and the other end of the pressure spring contacting the end of the second segment of the spindle assembly away from the valve opening. Using the above structure, because the outer diameter of the first segment of the spindle assembly is smaller than the outer diameter of the second segment of the spindle assembly, both ends of the pressure spring contact the guide ring and the end face of the first segment of the spindle assembly, respectively, and the pressure spring is fitted to the first segment of the spindle assembly. This makes the internal structure of the electronic expansion valve more compact, reduces the occupied space, reduces the overall volume of the electronic expansion valve, and improves the structural stability of the pressure spring.

[0008] Furthermore, the spindle assembly includes a spindle body and a spring sleeve, the spindle body including a connecting end and a sealing end provided opposite each other, the connecting end being connected to the spring sleeve, the spindle body being provided close to the valve opening, the spring sleeve forming a first segment of the spindle assembly, the spindle body forming a second segment of the spindle assembly, the spring sleeve being clearance-fitted to a guide ring, a pressure spring being fitted to the outside of the spring sleeve, one end of the pressure spring abutting against the connecting end, and the sealing end provided corresponding to the valve opening. That is, the pressure spring is provided between the connecting end of the spindle body and the guide ring. The guide ring also guides the spring sleeve so that the screw drives the spring sleeve and spindle body to move along the axial direction. In other embodiments, the pressure spring may be provided between the spring sleeve and the nut sleeve.

[0009] Furthermore, a connecting projection is provided on the end face of the connecting end, which is inserted into the spring sleeve and fixedly connected to the inner wall of the spring sleeve. Because the connecting projection is inserted into the spring sleeve and fixedly connected to the inner wall of the spring sleeve, the spindle body is stably connected inside the spring sleeve, thereby improving the structural stability between the spindle body and the spring sleeve. The connecting projection and the spring sleeve can be connected by welding.

[0010] Furthermore, the valve housing includes a valve core sleeve, a valve seat, and a valve cover. The valve opening is provided in the valve core sleeve, and there is a second through-hole in the valve seat. The valve seat has opposing first and second ends, the second end of the valve seat is fixedly connected to the valve core sleeve, and the second through-hole communicates with the valve opening. The spindle body is provided in the second through-hole, and the outer wall of the spindle body is clearance-fitted to the inner wall of the second through-hole. A housing is provided in the valve cover, and the valve cover has opposing first and second ends, the second end of the valve cover is fixedly connected to the first end of the valve seat, and the housing communicates with the second through-hole, and together they form a housing chamber. The outer wall of the spindle body is guide-engaged to the inner wall of the second through-hole, thereby allowing the second through-hole to guide the spindle body and further improving the coaxiality between the spindle body and the valve opening. The first end of the valve cover is sealed, i.e., the top of the housing is sealed.

[0011] Furthermore, an annular recess is provided on the outer wall of the spindle body, and an annular sealing ring is provided inside the annular recess. The annular sealing ring is used to seal the space between the inner wall of the second through-hole and the outer wall of the spindle body. By providing the annular sealing ring, it is possible to prevent fluid from entering between the spring sleeve and the second through-hole, thereby preventing corrosion of the pressure spring due to fluid and extending the service life of the pressure spring.

[0012] Furthermore, a limiting projection is provided on the end face of the connecting end of the spindle body. This limiting projection is arranged in an annular shape around the outer circumference of the spring sleeve, and the pressure spring is positioned inside the limiting projection. By providing the limiting projection, the pressure spring can be positioned between the limiting projection and the spring sleeve, guiding the pressure spring and thereby preventing torsional deformation of the pressure spring.

[0013] Furthermore, the spindle assembly includes a spindle body, and the valve housing includes a valve seat and a valve core. The spindle body is mounted within the valve seat, and the valve core is mounted at one end of the valve seat. The valve core has a valve opening, and the hardness of the material of the valve core is less than that of the material of the spindle body. The end of the valve core closest to the spindle body is provided with a mounting contact surface and a avoidance surface. A stepped structure is formed between the mounting contact surface and the avoidance surface. The inner wall surface or avoidance surface of the valve core forms a sealing surface, and the sealing surface contacts the outer wall surface of the spindle body to form a soft seal structure.

[0014] Furthermore, the mounting contact surface is provided to protrude from the avoidance surface, forming a stepped structure.

[0015] Furthermore, a sealing contact portion is provided at the end of the spindle body closest to the valve core. This sealing contact portion contacts the sealing surface to form a soft seal structure and has an arc-shaped structure.

[0016] Furthermore, the sealed contact portion is located at the connection point between the end of the spindle body and the outer wall of the spindle body, and has an arc-shaped transition structure.

[0017] Furthermore, the valve core is made of a non-metallic material, and it is fixed in place by contacting the valve seat and the mounting contact surface.

[0018] Furthermore, the valve seat has a first mounting port and a second mounting port provided opposite each other along the axial direction, and a communication passage that penetrates the valve seat radially. The first mounting port is located above the second mounting port, and the communication passage is provided on the side wall of the valve seat and located between the first and second mounting ports. The cross-sectional area of ​​the second mounting port is larger than that of the first mounting port, and the outer shape of the second mounting port matches the outer shape of the valve core so that the valve core can be attached to the second mounting port.

[0019] Furthermore, the inner wall surface of the valve core is tapered, forming a sealing surface, and the valve core has a first end and a second end that are positioned opposite each other, with the first end located above the second end, and the flow area of ​​the sealing surface gradually decreases along the direction of extension from the first end to the second end.

[0020] Furthermore, the spindle body is provided with balancing passages to equalize the pressure at both ends of the spindle body.

[0021] Furthermore, the valve housing further includes a valve core sleeve, at least a portion of which is mounted in a second mounting port, and the valve core sleeve is located at one end of the valve core away from the spindle body, and includes a main body portion and a positioning portion, at least a portion of which is inserted through the second mounting port, the end of the main body portion abuts against the end of the valve core, and the positioning portion is provided protruding from the outer wall of the main body portion and is used to abut against the end of the valve seat for positioning, and is connected to the end of the valve seat by welding.

[0022] Furthermore, the valve housing includes a valve seat and a valve core, the valve core being attached to one end of the valve seat and forming a valve opening; the spindle assembly includes a spindle body, a spring sleeve and a buffer spring, the spindle body being mounted within the valve seat and the buffer spring being mounted within the spring sleeve, a screw being movably mounted at one end of the spring sleeve and the other end of the spring sleeve being connected to the spindle body; the electronic expansion valve further includes a guide ring, the guide ring being provided on the valve seat and having a guide passage; the spring sleeve being movably provided within the guide passage along the extending direction of the guide passage; the valve seat having a first equilibrium hole, the first equilibrium hole being provided to penetrate the internal cavity of the valve seat and the external space of the valve seat.

[0023] Furthermore, the guide ring and valve seat are either integrally molded or separate components.

[0024] Furthermore, the electronic expansion valve further includes a pressing sleeve, which is provided on the valve seat and protrudes from the end of the valve seat, has an annular structure, is fitted to the outside of the spring sleeve, and the pressing sleeve and the valve seat are either integrally molded or separate structures, the valve housing includes a valve cover, the opening of which is connected to one end of the pressing sleeve away from the valve seat, and a screw is movably provided inside the valve cover.

[0025] Furthermore, the electronic expansion valve further includes a nut sleeve, the inner wall of the nut sleeve abutting against the outer wall of the guide ring, and the nut sleeve is provided with a first flow hole that connects the internal cavity of the nut sleeve with the outer space of the nut sleeve, and a second flow hole that connects the upper end cavity and the lower end cavity of the nut sleeve.

[0026] Furthermore, the valve seat has a connecting end face at the end closest to the guide ring, which is connected to the guide ring, and the first balancing hole is located on the edge of the connecting end face such that the first balancing hole forms a lateral opening structure.

[0027] Furthermore, a second equilibrium hole is provided in the side wall of the spring sleeve.

[0028] When the technical solution of the present application is applied, the valve housing has a receiving chamber and a valve port, the nut sleeve is provided in the receiving chamber, the screw is screwed into the nut sleeve, the second end of the screw is connected to the spindle assembly, the screw drives the spindle assembly to seal or open the valve port, and the pressure spring is provided between the spindle assembly and the nut sleeve. When using the above structure, the pressure spring can maintain that the screwing part of the screw and the nut sleeve always has the upper side surfaces of their threads in contact with each other, or always has the lower side surfaces of their threads in contact with each other. Thereby, in the process of the screw moving upward or downward with respect to the nut sleeve, the position of the screw with respect to the nut sleeve is not affected by screw play. Thereby, the degree of opening of the valve port of the spindle assembly is not affected by screw play. Furthermore, in the process of the screw moving up and down, when the screw rotates to the same position, it is possible to avoid the degree of opening of the valve port of the spindle assembly being different. Thereby, the accuracy of the flow control of the electronic expansion valve can be improved.

Brief Description of the Drawings

[0029] The drawings in the specification constituting a part of the present application are for providing a further understanding of the present application. The schematic embodiments and their descriptions of the present application are for interpreting the present application and do not unduly limit the present application.

[0030] [Figure 1] The structural schematic diagram of the electronic expansion valve provided by the embodiment of the present application is shown. [Figure 2] The partial enlarged view of part A in FIG. 1 is shown. [Figure 3] The structural schematic diagram of the partial structure of the electronic expansion valve provided by the embodiment of the present invention is shown. [Figure 4] The exploded view of the partial structure in FIG. 3 is shown. [Figure 5] The structural schematic diagram of the mounting structure of the screw, bearing and spring sleeve provided by the embodiment of the present invention is shown. [Figure 6] This diagram shows a schematic structure in which a bearing provided by an embodiment of the present invention is fitted onto a screw. [Figure 7] Figure 3 shows a schematic diagram of the structure attached to the mounting base.

[0031] The above drawing includes the following reference numerals: 10 Valve housing, 11 Housing chamber, 12 Valve port, 13 Valve core sleeve, 131 Main body, 132 Positioning part, 14 Valve seat, 141 First end of valve seat, 142 Second end of valve seat, 143 Second through hole, 144 First balancing hole, 15 Valve cover, 151 Housing part, 152 Second end of valve cover, 153 First end of valve cover, 16 Flow rate adjustment ring, 17 Valve core, 171 Mounting contact surface, 172 Avoidance surface, 173 Inner wall surface, 20 Nut sleeve, 21 First through hole, 211 Thread segment, 212 Guide segment, 22 First flow hole, 23 Second flow hole, 30 Screw, 31 First end of screw, 32 Second end of screw, 41 Spring sleeve, 411 Second balancing hole, 42 Spindle body, 421 4211 connecting end, 422 sealing end, 423 annular recess, 424 annular sealing ring, 425 sealing contact, 43 bearing, 431 inner ring, 432 outer ring, 44 connecting member, 441 first segment of connecting member, 442 second segment of connecting member, 45 buffer spring, 50 pressure spring, 60 guide ring, 70 second sealing member, 80 third sealing member, 100 mounting base, 120 pressing sleeve. [Modes for carrying out the invention]

[0032] The technical aspects of the embodiments of this application will be described clearly and completely below with reference to the drawings of the embodiments of this application, but it is clear that the embodiments described are only a selection of embodiments of this application, not all embodiments. All other embodiments that a person skilled in the art could obtain without creative effort based on the embodiments of this application are all within the scope of protection of this application.

[0033] As shown in Figures 1 and 2, Embodiment 1 of the present application provides an electronic expansion valve comprising a valve housing 10, a nut sleeve 20, a screw 30, a spindle assembly and a pressure spring 50. The valve housing 10 has a housing chamber 11 and a valve port 12, the valve port 12 communicating with the housing chamber 11; the nut sleeve 20 is provided within the housing chamber 11 and fixedly connected to the valve housing 10; the screw 30 has a first end and a second end provided opposite to each other, the first end 31 of the screw provided spaced apart from the valve port 12, the screw 30 is inserted into the nut sleeve 20 and screwed into the nut sleeve 20; the spindle assembly is provided corresponding to the valve port 12, the second end 32 of the screw connected to the spindle assembly, the screw 30 drives the spindle assembly to seal or open the valve port 12; and the pressure spring 50 is provided between the spindle assembly and the nut sleeve 20 and can tightly seal the threads of the screw 30 and the threads of the nut sleeve 20. The pressure spring 50 always maintains either a compressed or extended state. In this application, when the pressure spring 50 is always in a compressed state, the pressure spring 50 ensures that the lower surface of the screw threads of the screw 30 always contacts the lower surface of the screw threads of the nut sleeve 20. When the pressure spring 50 is always in an extended state, the pressure spring 50 ensures that the upper surface of the screw threads of the screw 30 always contacts the upper surface of the screw threads of the nut sleeve 20. Therefore, by using the pressure spring 50, the position of the screw 30 relative to the nut sleeve 20 is not affected by screw play during the upward and downward movement of the screw 30. This ensures that the degree to which the valve port of the spindle assembly opens is not affected by screw play during the upward and downward movement of the screw 30, and furthermore, that the accuracy of flow control of the electronic expansion valve is improved.

[0034] In the technical aspects of this application, the valve housing 10 has a housing chamber 11 and a valve port 12, a nut sleeve 20 is provided in the housing chamber 11, a screw 30 is screwed into the nut sleeve 20, the second end 32 of the screw is connected to a spindle assembly, the screw 30 drives the spindle assembly to seal or open the valve port 12, and a pressure spring 50 is provided between the spindle assembly and the nut sleeve 20. Using the above structure, the pressure spring 50 can maintain that the screw-fitting portion between the screw 30 and the nut sleeve 20 is always in contact with either the upper or lower surfaces of the threads. As a result, the position of the screw 30 relative to the nut sleeve 20 is not affected by screw play during the up-and-down movement of the screw 30 relative to the nut sleeve 20. This prevents the degree to which the valve port 12 of the spindle assembly is opened from being affected by screw play. Furthermore, as the screw 30 moves up and down, it is possible to avoid differences in the degree to which the valve port 12 of the spindle assembly is opened when the screw 30 moves to the same position, thereby improving the accuracy of flow control of the electronic expansion valve. Moreover, the above technical embodiment has advantages such as a simple structure, low manufacturing cost, and easy installation.

[0035] In this embodiment, the nut sleeve 20 has a first through hole 21 extending axially, the first through hole 21 including a threaded segment 211 and a guide segment 212, the threaded segment 211 being spaced apart from the valve port 12, and a guide ring 60 connected to at least a portion of the valve housing 10 being provided inside the guide segment 212, with both ends of the pressure spring 50 in contact with the guide ring 60 and the spindle assembly, respectively. The threaded segment 211 is screwed onto the screw 30. The spindle assembly is inserted into the guide ring 60, and the guide ring can guide the spindle assembly, thereby improving the coaxiality between the spindle assembly and the valve port 12. Furthermore, the guide ring 60 is provided on the inner wall of the guide segment 212, and both ends of the pressure spring 50 in contact with the guide ring 60 and the spindle assembly, respectively, thereby reducing the diameter of the pressure spring 50, thereby preventing friction between the pressure spring 50 and the inner wall of the housing chamber 11. Optionally, the guide ring 60 is connected to the nut sleeve 20 by welding, but the two may be fixedly connected by integral injection molding.

[0036] Specifically, the spindle assembly includes a first segment and a second segment, the outer diameter of the first segment of the spindle assembly being smaller than the outer diameter of the second segment of the spindle assembly, the second segment of the spindle assembly being positioned close to the valve port 12, the first segment of the spindle assembly being connected to the second end 32 of the screw and movably mounted within a guide ring 60, a pressure spring 50 fitted to the outside of the first segment of the spindle assembly, one end of the pressure spring abutting against the guide ring 60 and the other end of the pressure spring 50 abutting against the end of the second segment of the spindle assembly away from the valve port 12. The guide ring 60 is used to guide the first segment of the spindle assembly. Using the above structure, since the outer diameter of the first segment of the spindle assembly is smaller than the outer diameter of the second segment of the spindle assembly, both ends of the pressure spring 50 abut against the guide ring 60 and the end face of the first segment of the spindle assembly, respectively, and the pressure spring 50 is fitted into the first segment of the spindle assembly. This makes the internal structure of the electronic expansion valve more compact, reduces the occupied space, reduces the overall volume of the electronic expansion valve, and improves the structural stability of the pressure spring 50.

[0037] In this embodiment, the spindle assembly includes a spindle body 42 and a spring sleeve 41, the spindle body 42 includes a connecting end 421 and a sealing end 422 provided opposite to each other, the connecting end 421 is connected to the spring sleeve 41, the spindle body 42 is provided close to the valve port 12, the spring sleeve 41 forms the first segment of the spindle assembly, the spindle body 42 forms the second segment of the spindle assembly, the spring sleeve 41 is clearance-fitted to the guide ring 60, the pressure spring 50 is fitted to the outside of the spring sleeve 41, one end of the pressure spring 50 abuts against the connecting end 421, the connecting end 421 is fixedly connected to the spring sleeve 41, and the sealing end 422 is provided corresponding to the valve port 12. That is, the pressure spring is provided between the connecting end 421 of the spindle body 42 and the guide ring 60. Furthermore, the guide ring 60 guides the spring sleeve 41 so that the screw 30 drives the spring sleeve 41 and the spindle body 42 to move along the axial direction. In other embodiments, the pressure spring 50 may be provided between the spring sleeve 41 and the nut sleeve 20.

[0038] In this embodiment, the spindle assembly further includes a bearing 43, which is housed within a spring sleeve 41. The bearing 43 includes an inner ring 431 and an outer ring 432. The inner ring 431 is fitted and fixedly connected to the second end 32 of the screw, and the inner wall of the spring sleeve 41 is clearance-fitted to the outer ring 432. The inner wall of the spring sleeve 41 is used to guide the outer ring 432. By providing the bearing 43, the inner ring 431 rotates with the screw 30, while the outer ring 432, spring sleeve 41, and spindle body 42 do not rotate with the screw 30. This reduces friction between the outer ring 432, spring sleeve 41, and spindle body 42 and the other components, extending the service life of the entire device. The inner wall of the spring sleeve 41 is used to guide the outer ring 432, thereby preventing the bearing 43 and screw 30 from tilting as the bearing 43 moves axially together with the screw 30. This improves the coaxiality between the screw 30 and the valve port 12, and further improves the coaxiality between the spindle assembly and the valve port.

[0039] In this embodiment, the spindle assembly further includes a connecting member 44 and a buffer spring 45 arranged sequentially along the axial direction, the buffer spring 45 being positioned close to the valve opening 12, both the connecting member 44 and the buffer spring 45 located within the spring sleeve 41, the connecting member 44 including a first segment and a second segment, the second segment 442 of the connecting member being positioned close to the valve opening 12, the diameter of the first segment 441 of the connecting member being larger than the diameter of the second segment 442 of the connecting member, the first segment 441 of the connecting member contacting the outer ring 432, one end of the buffer spring 45 being fitted to the outside of the second segment 442 of the connecting member and contacting the end face of the first segment 441 of the connecting member, and the other end of the buffer spring 45 contacting the spindle body 42. By using the above structural arrangement, the structural stability between the connecting member 44, the buffer spring 45 and the outer ring 432 can be improved, and thus the overall structural stability of the spindle assembly can be improved. The connecting member 44 is used to connect the buffer spring 45 and the outer ring 432. Optionally, the connecting member 44 has a through hole, which is used to avoid the inner ring 431 and the second end 32 of the screw. The buffer spring 45 is used to mitigate the thrust between the screw 30 and the spindle body 42, preventing the screw 30 from continuing to move downward and excessively pressing against the spindle body 42 after the spindle body 42 has sealed the valve opening 12.

[0040] Specifically, a connecting projection 4211 is provided on the end face of the connecting end 421, and the connecting projection 4211 is inserted into the spring sleeve 41 and fixedly connected to the inner wall of the spring sleeve 41. Because the connecting projection 4211 is inserted into the spring sleeve 41 and fixedly connected to the inner wall of the spring sleeve 41, the spindle body 42 is stably connected inside the spring sleeve 41, thereby improving the structural stability between the spindle body 42 and the spring sleeve 41. The connecting projection 4211 and the spring sleeve 41 can be connected by welding.

[0041] Specifically, the valve housing 10 includes a valve core sleeve 13, a valve seat 14, and a valve cover 15. The valve port 12 is provided in the valve core sleeve 13. The valve seat 14 has a second through hole 143, and the valve seat 14 has opposing first and second ends, the second end 142 of the valve seat is fixedly connected to the valve core sleeve 13, and the second through hole 143 communicates with the valve port 12. The spindle body 42 is provided in the second through hole 143, and the outer wall of the spindle body 42 is guide-engaged with the inner wall of the second through hole 143. The valve cover 15 has a housing portion 151, and the valve cover 15 has opposing first and second ends, the second end 152 of the valve cover is fixedly connected to the first end 141 of the valve seat, and the housing portion 151 communicates with the second through hole 143, and the two together form a housing chamber 11. Using the above structure makes it easy to install the internal components of the electronic expansion valve. The nut sleeve 20 is fixedly connected to the end face of the first end 141 of the valve seat, making it easier to install the nut sleeve 20. The outer wall of the spindle body 42 is guide-engaged to the inner wall of the second through hole 143, so that the second through hole 143 can guide the spindle body 42, further improving the coaxiality between the spindle body 42 and the valve port 12. The first end 153 of the valve cover is sealed, that is, the top of the housing portion 151 is sealed. In this embodiment, a flow rate adjustment ring 16 and a valve core 17 are provided between the valve core sleeve 13 and the valve seat 14, the flow rate adjustment ring 16 is provided close to the valve seat 14 and located outside the spindle body 42, the valve core 17 is provided close to the valve port 12, the spindle body 42 abuts against the valve core 17 when sealing the valve port 12, and the valve core 17 may be a soft seal gasket. The flow rate adjustment ring 16 has a flow through-hole, which is provided corresponding to the valve port 12. By adjusting the shape of the inner wall of the flow through-hole, the flow characteristic curve of the electronic expansion valve can be adjusted. The valve core 17 is used to achieve a soft seal of the valve port 12 and to prevent leakage of the inside of the electronic expansion valve when the valve port 12 is closed.

[0042] In this embodiment, the guide ring 60 is provided integrally with the valve seat 14, and the guide ring 60 is provided with a communication hole, so that the areas above and below the guide ring 60 in the housing chamber 11 are in communication through the communication hole. Specifically, an annular recess 423 is provided on the outer wall of the spindle body 42, and an annular sealing ring 424 is provided inside the annular recess 423, and the annular sealing ring 424 is used to seal the space between the inner wall of the second through hole 143 and the outer wall of the spindle body 42. By providing the annular sealing ring 424 inside the annular recess 423, it is possible to prevent the annular sealing ring 424 from detaching from the spindle body 42. By providing the annular sealing ring 424, it is possible to prevent fluid from entering between the spring sleeve 41 and the second through hole 143, thereby preventing corrosion of the pressure spring by fluid and extending the service life of the pressure spring.

[0043] In this embodiment, a limiting projection is further provided on the end face of the connecting end 421 of the spindle body 42. The limiting projection is provided in an annular shape on the outer circumference of the spring sleeve 41, and the pressure spring 50 is located inside the limiting projection. By providing the limiting projection, the pressure spring 50 can be positioned between the limiting projection and the spring sleeve 41, guiding the pressure spring 50 and thereby preventing torsional deformation of the pressure spring 50.

[0044] As shown in Figures 3 to 7, Embodiment 2 of the present application further includes a valve core 17 and a drive assembly, and provides an electronic expansion valve in which a spindle body 42 is mounted within a valve seat 14. The valve core 17 is mounted within the valve seat 14 and is attached to one end of the valve seat 14. The valve core 17 is fitted into the spindle body 42 to form a valve opening, specifically the hollow structure of the valve core 17 forming the valve opening. The drive assembly drives the spindle body 42 to move axially and open and close the valve opening. Here, the hardness of the material of the valve core 17 is less than the hardness of the material of the spindle body 42, and the end of the valve core 17 closest to the spindle body 42 is provided with a mounting contact surface 171 and a avoidance surface 172, with a stepped structure formed between the mounting contact surface 171 and the avoidance surface 172. The inner wall surface 173 or the avoidance surface 172 of the valve core 17 forms a sealing surface, and the sealing surface and the outer wall surface of the spindle body 42 come into contact to form a soft seal structure. Specifically, the mounting contact surface 171 engages in contact with other components of the electronic expansion valve and is used to position the mounting contact surface 171 by the other components of the electronic expansion valve.

[0045] With this structural arrangement, since the hardness of the material of the valve core 17 is lower than that of the material of the spindle body 42, it becomes easy to form a soft seal structure between the sealing surface and the outer wall surface of the spindle body 42. This soft seal structure effectively prevents leakage between the valve core 17 and the valve seat 14, thereby improving the sealing performance of the electronic expansion valve. Furthermore, since a stepped structure is provided between the mounting contact surface 171 and the avoidance surface 172, other components of the electronic expansion valve do not directly contact the avoidance surface 172, but instead contact and position themselves relative to the valve core 17 via the mounting contact surface 171. Moreover, during installation, deformation of the avoidance surface 172 or the inner wall surface 173 of the valve core 17 due to the mounting compression of the mounting contact surface 171 is prevented, the sealing surface does not deform, the influence of the pressing mounting force on the sealing surface is reduced, and the sealing performance of the electronic expansion valve is further improved. Furthermore, because the mounting contact surface and the sealing surface are not the same surface or are not directly connected surfaces, the material of the valve core 17 can avoid affecting the sealing surface due to thermal expansion and cold contraction when it comes into contact with other components of the electronic expansion valve, thereby further improving the sealing performance of the electronic expansion valve. Accordingly, the technical aspects provided by this embodiment can solve the technical problem of low sealing performance in conventional electronic expansion valves.

[0046] Specifically, the mounting contact surface 171 can be provided to protrude from the avoidance surface 172 to form a stepped structure.

[0047] In this embodiment, a sealing contact portion 425 is provided at the end of the spindle body 42 closest to the valve core 17. The sealing contact portion 425 contacts the sealing surface to form a soft seal structure and has an arc-shaped structure. By using this structural arrangement, since the hardness of the material of the valve core 17 is lower than the hardness of the material of the spindle body 42, the arc-shaped structure of the sealing contact portion 425 prevents the valve core 17 from being damaged by the spindle body 42, thereby extending the durability and service life of the valve core.

[0048] Preferably, in this embodiment, the sealing contact portion 425 is located at the connection between the end of the spindle body 42 and the outer wall of the spindle body 42, and has an arc-shaped transition structure. Using such a structural arrangement makes it easier for the valve core 17 to be damaged by the spindle body 42, improves the self-centering effect, improves the sealing performance at the valve port, reduces wear on the valve core 17 to better improve the durability of the valve core 17, and further effectively extends the service life of the entire electronic expansion valve.

[0049] In this embodiment, the valve core 17 is made of a non-metallic material, and the inner wall or end face of the valve core 17 (the end face may refer to the upper end face or the lower end face, or both the upper and lower end faces) forms a sealing surface, and a soft seal structure is formed between the sealing surface and the outer wall surface of the spindle body 42. By using this structural arrangement, a soft seal structure is formed between the sealing surface and the outer wall surface of the spindle body 42, and this soft seal structure can prevent leakage between the valve core 17 and the valve seat 14, thereby improving the sealing performance of the electronic expansion valve. Specifically, in this embodiment, the valve core 17 is mainly made of a plastic material, and after the valve core 17 made of a non-metallic material and the spindle body 42 made of a metal material are installed, the sealing performance can be improved because the non-metallic material is softer than the metal material, and the hard material and soft material are installed together. Furthermore, since the valve core 17 is made of a non-metallic material, a soft seal structure can also be formed between the valve core 17 and the valve seat 14, thereby further improving the sealing performance of the electronic expansion valve.

[0050] In this embodiment, the valve core 17 can be fixed by bringing the valve seat 14 into contact with the mounting contact surface 171 in order to improve the limiting stability of the valve core 17 and to avoid rattling of the valve core 17 during the work process.

[0051] Specifically, in order to further improve the sealing performance of the electronic expansion valve, the valve core 17 in this embodiment is made of polytetrafluoroethylene material.

[0052] In this embodiment, the valve seat 14 has a first mounting port and a second mounting port that are arranged opposite each other along the axial direction. The valve seat 14 is further provided with a communication passage that penetrates the valve seat 14 radially. The first mounting port is located above the second mounting port, and the communication passage is provided on the side wall of the valve seat 14 and is located between the first and second mounting ports. The cross-sectional area of ​​the second mounting port is larger than that of the first mounting port, and the outer shape of the second mounting port matches the outer shape of the valve core 17 so that the valve core 17 can be attached to the second mounting port. With this structural arrangement, the installation operation is made easier because the valve core 17 can be attached directly from the second mounting port. Since the valve core 17 can be attached from the second mounting port, the valve core can be made larger in diameter, thereby enabling high flow rates.

[0053] Specifically, the valve seat 14 has an annular structure, and in this embodiment, the valve seat 14 has a circular structure.

[0054] Specifically, in this embodiment, the sealing surface is a tapered surface, and the valve core 17 has a first end and a second end that are opposite each other, with the first end located above the second end, and the flow area of ​​the sealing surface gradually decreases along the direction of extension from the first end to the second end. Using such a structural arrangement, the sealing performance between the valve core 17 and the spindle body 42 can be improved and leakage between the valve core 17 and the spindle body 42 can be reduced.

[0055] In this embodiment, the spindle body 42 is provided with an equilibrium passage for equalizing the pressure at both ends of the spindle body 42, and an annular sealing ring 424 is provided between the spindle body 42 and the valve seat 14 in order to further improve the sealing performance and achieve pressure balance at the upper and lower ends of the spindle when the valve is closed. This annular sealing ring 424 corresponds to the first sealing member.

[0056] Specifically, the electronic expansion valve in this embodiment further includes a buffer spring 45, a screw 30, and a bearing 43. One end of the spring sleeve 41 is fitted to the end of the spindle body 42, and the buffer spring 45 is mounted inside the spring sleeve 41. The screw 30 is provided at the other end of the spring sleeve 41, and the bearing 43 is fitted to the screw 30 and positioned between the screw 30 and the spring sleeve 41. With this structural arrangement, the bearing 43 is provided between the screw 30 and the spring sleeve 41, creating a soft seal between the valve core 17 and the valve seat 14. As a result, the frictional force between the valve core 17 and the screw 30 becomes smaller than the frictional force between the valve core 17 and the valve seat 14, thus avoiding the problem of wear on the soft seal valve port.

[0057] In this embodiment, the drive assembly of the electronic expansion valve includes a rotor assembly and a nut assembly, the rotor assembly being fitted to the outside of the nut assembly, and one end of the screw 30 away from the spindle body 42 being fixedly connected to the rotor assembly, and the rotor assembly adjusting the opening of the valve port by moving the spindle body 42 axially via the screw. The nut assembly is provided with a female thread that is screwed into the spindle body 42, and the nut assembly is fixedly connected to the valve seat 14 by a connecting member.

[0058] In this embodiment, the electronic expansion valve further includes a valve core sleeve 13, at least a portion of which is mounted within the second mounting port, and the valve core sleeve 13 is located at one end of the valve core 17 away from the spindle body 42. Using this structural arrangement, the conventional one-piece structure of the valve seat 14 is changed to a separate structure, making the installation operation easier. At the same time, the structure of the valve core sleeve 13 facilitates the positioning of the valve core 17 and improves the installation stability of the valve core 17, thereby improving the performance of the entire structure. The valve core sleeve 13 may be fitted to the outside of the second mounting port, provided that the valve core sleeve 13 and the spindle body 42 can be realized.

[0059] Specifically, the valve core sleeve 13 in this embodiment includes a main body portion 131 and a positioning portion 132. At least a portion of the main body portion 131 is inserted into the second mounting opening, and the end of the main body portion 131 abuts against the end of the valve core 17. The positioning portion 132 is provided protruding from the outer wall of the main body portion 131 and is used to abut against the end of the valve seat 14 for positioning. Using such a structural arrangement facilitates good positioning operation of the valve core 17 and improves the installation stability of the valve core 17.

[0060] Preferably, in order to facilitate production and manufacturing, the main body portion 131 and the positioning portion 132 in this embodiment are integrally molded.

[0061] In this embodiment, the positioning portion 132 is connected to the end of the valve seat 14 by welding, further improving the positioning stability relative to the valve core 17 and also improving the installation stability of the valve core sleeve 13.

[0062] Specifically, the electronic expansion valve in this embodiment further includes a mounting base 100, the mounting base 100 having a mounting passage, and the valve seat 14, valve core 17, and valve core sleeve 13 are all mounted within the mounting passage. Here, a second sealing member 70 may be provided between the mounting base 100 and the valve seat 14. Alternatively, a third sealing member 80 may be provided between the mounting base 100 and the valve core sleeve 13. Alternatively, a second sealing member 70 may be provided between the mounting base 100 and the valve seat 14, and a third sealing member 80 may be provided between the mounting base 100 and the valve core sleeve 13.

[0063] Preferably, in this embodiment, a second sealing member 70 is provided between the mounting base 100 and the valve seat 14, and a third sealing member 80 is provided between the mounting base 100 and the valve core sleeve 13. Using such a structural arrangement, the sealing performance of the electronic expansion valve can be further improved.

[0064] In this embodiment, the mounting base 100 is either a valve body or a mounting base, and the specific mounting method can be determined according to actual use.

[0065] To solve the leakage problem, the valve core 17 in this embodiment is made of a soft sealing material. In order to achieve a large flow rate and internal balance (making it easier to open the valve), the valve assembly has a reverse mounting structure, that is, the valve core 17 is assembled from the bottom upwards, and the valve seat structure is a separate structure (the valve seat structure includes the valve seat and the valve core sleeve, and in order to form a separate structure, the valve seat and the valve core sleeve are two parts), and the problem of the valve opening leaking is solved by providing the valve seat 14, valve core 17 and valve core sleeve 13. The valve core 17 in this embodiment has a large diameter structure, and since there is basically no relative movement between the valve core 17 and the spindle body 42, friction between the valve core 17 and the spindle body 42 is reduced, and wear of the valve core 17, which is made of a soft sealing material, is prevented.

[0066] As shown in Figures 3 to 7, the electronic expansion valve of this embodiment further includes a guide ring 60. The guide ring 60 is provided on the valve seat 14, and a guide passage is provided in the guide ring 60, and the spring sleeve 41 is provided so as to be movable within the guide passage along the extending direction of the guide passage. Here, the valve seat 14 is provided with a first balancing hole 144, and the first balancing hole 144 is provided so as to penetrate the internal cavity of the valve seat 14 and the external space of the valve seat 14.

[0067] By using the electronic expansion valve provided in this embodiment, the presence of a guide ring 60 and a guide passage in the guide ring 60 facilitates the movement of the spring sleeve 41 along the direction of extension of the guide passage. This facilitates the restriction of the direction of movement of the spring sleeve 41, preventing misalignment of the spring sleeve 41's movement. Furthermore, it prevents misalignment of the spindle body 42's movement, prevents rattling of the spindle body 42, and improves the stability of the spindle body 42's movement. Preferably, the restriction and guiding role of the guide passage to the spring sleeve 41 can be achieved by controlling the gap between the wall surface of the guide passage and the outer wall of the spring sleeve 41 to a small, reasonable range. Furthermore, by providing the first equilibrium hole 144, the upper cavity of the valve seat 14 and the internal cavity of the valve seat 14 can be connected, enabling equilibrium between the pressure in the upper cavity of the valve seat 14 and the pressure in the internal cavity of the valve seat 14. This improves the rate at which the pressure in the upper cavity of the spindle body 42 is equilibrium, achieving a rapid equilibrium and avoiding difficulties in opening and closing due to sudden pressure changes. Therefore, the technical aspects provided by this embodiment can solve the technical problem of low spindle motion stability in conventional electronic expansion valves.

[0068] Specifically, in order to further improve coaxiality, the guide ring 60 and the valve seat 14 are made as a single molded structure. Alternatively, in order to facilitate processing and installation, the guide ring 60 and the valve seat 14 are made as separate structures.

[0069] In this embodiment, the electronic expansion valve further includes a pressing sleeve 120 and a valve cover 15 (which may also be referred to as a sleeve). The pressing sleeve 120 is provided on the valve seat 14 and protrudes from the end of the valve seat 14, has an annular structure, and is fitted to the outside of the spring sleeve 41. The opening of the valve cover 15 is connected to one end of the pressing sleeve 120 away from the valve seat 14, and the screw 30 is movably provided inside the valve cover 15. Using such a structural arrangement can improve the installation stability of the valve cover 15.

[0070] Specifically, in order to further improve the installation stability of the structure, the pressing sleeve 120 and the valve seat 14 are integrally molded. Alternatively, in order to facilitate processing and installation, the pressing sleeve 120 and the valve seat 14 are separate structures.

[0071] Specifically, the drive assembly in this embodiment includes a nut sleeve 20, the inner wall of the nut sleeve 20 abuts against the outer wall of the guide ring 60, and the outer wall of the guide ring 60 abuts against the inner wall of the nut sleeve 20. Therefore, during installation, the nut sleeve 20 can be guided and installed by the guide ring 60, improving the coaxiality between the spindle body 42 and the valve port. Specifically, the valve seat 14 has a connecting end face at the end closest to the guide ring 60, the connecting end face is connected to the guide ring 60, and the first balancing hole 144 is located on the edge of the connecting end face such that the first balancing hole 144 forms a lateral opening hole structure. By machining the lateral opening hole structure from the edge of the connecting end face, burrs facing the chamber of the valve seat 14 are not generated in the first balancing hole, thereby solving the problems of spindle damage due to burrs and their impact on spindle opening and closing. Specifically, the first balancing hole 144 is located on the edge of the connecting end face away from the guide ring 60.

[0072] Specifically, a second balancing hole 411 is provided in the side wall of the spring sleeve 41 in this embodiment. With this structural arrangement, the valve port and the internal cavity of the valve seat 14 can be connected by the second balancing hole 411, and then connected to the rotor chamber by the first balancing hole 144. Since the rotor chamber is a chamber surrounded by the valve cover 15, it becomes even easier to achieve rapid balancing of the upper and lower pressures of the spindle, and the unbalanced pressure experienced by the spindle body 42 when the pressure changes suddenly is reduced.

[0073] In this embodiment, the nut sleeve 20 is provided with a first flow hole 22 that connects the internal cavity of the nut sleeve 20 with the external space of the nut sleeve 20, and a second flow hole 23 that connects the upper end cavity of the nut sleeve 20 with the lower end cavity. Specifically, the lower end cavity of the nut sleeve 20 is the upper end cavity of the valve seat 14, and the upper end cavity of the nut sleeve 20 is the rotor chamber. Therefore, the rotor chamber is connected to the valve port by multiple flow passages so that a rapid balance of the upper and lower pressures of the spindle body 42 can be achieved. The rotor chamber may achieve communication with the valve port through the first flow hole 22, the upper end cavity of the valve seat 14, the first balancing hole 144, the internal cavity of the valve seat, the second balancing hole 411, the internal cavity of the spring sleeve 41, and the balancing passage of the spindle body 42. Alternatively, the rotor chamber may achieve communication with the valve port through the second flow hole 23, the internal cavity of the nut sleeve 20, the internal cavity of the spring sleeve 41, and the balancing passage of the spindle body 42. Alternatively, the rotor chamber may achieve communication with the valve port through the second flow hole 23, the internal cavity of the nut sleeve 20, the gap between the guide ring 60 and the spring sleeve 41, the internal cavity of the valve seat 14, the second balancing hole 411, the internal cavity of the spring sleeve 41, and the balancing passage of the spindle body 42.

[0074] It should be explained that in this embodiment, the upper and lower ends refer to the same direction as the structural depiction in the drawing. For example, the spindle body 42 is located above the valve core sleeve 13.

[0075] From the above description, it can be seen that the above embodiment of the present invention achieves the technical effect of reducing leakage and improving the sealing effect of the electronic expansion valve.

[0076] 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 described herein. As used herein, unless otherwise explicitly stated in the context, the singular form is also intended to include the plural form, and furthermore, when the terms “encompassing” and / or “containing” are used herein, it should be understood that there are features, steps, operations, devices, assemblies and / or combinations thereof.

[0077] Unless otherwise specifically stated, the relative arrangements of components and steps, formulas, and numerical values ​​described in these embodiments do not limit the scope of this application. At the same time, for the sake of clarity, it should be understood that the dimensions of the parts shown in the drawings are not depicted in actual proportions. Detailed descriptions of technologies, methods, and apparatus already known to those skilled in the art may be omitted, but where necessary, such technologies, methods, and apparatus should be considered as part of the approved specification. In all examples shown and described herein, any specific values ​​should be interpreted as illustrative only and not limiting. Therefore, other examples of exemplary embodiments may have different values. Similar reference numerals and letters represent similar elements in subsequent drawings; therefore, once something is defined in one drawing, further explanation of it is not necessary in subsequent drawings.

[0078] In the description of this application, directional or positional relationships expressed using directional terms such as "front, back, up, down, left, right," "horizontal, vertical, vertical, horizontal," and "top, bottom" are generally based on the directional or positional relationships shown in the drawings. However, these are merely for the purpose of facilitating and concisely describing this application, and unless otherwise stated, these directional terms do not necessarily indicate or imply that the shown device or element has a specific direction or is configured and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of this application, and the directional terms "inside" and "outside" refer to the inside and outside of the contour of each component itself.

[0079] For the sake of clarity, spatial relative terms such as "above," "above," "on the top surface," and "on top" can be used here to describe the spatial relationship between one device or feature and another, as shown in the diagram. It should be understood that spatial relative terms are intended to encompass different orientations during use or operation, other than the orientation indicated in the diagram of the device. For example, if the top and bottom of the device in the drawing are reversed, a device described as "above another device or structure" or "on top of another device or structure" would subsequently be positioned "below another device or structure" or "below another device or structure." Thus, the exemplary term "above" can include two orientations: "above" and "below." This device can also be positioned in other different ways (rotated 90 degrees or positioned in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0080] Furthermore, it should be explained that the use of terms such as "first," "second," etc., to define parts is merely for distinguishing corresponding parts, and unless otherwise specified, these terms do not have any special meaning and should not be understood as limiting the scope of protection of this application.

[0081] The foregoing describes only 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 spirit and principles of this application should be included within the scope of protection.

Claims

1. The valve housing (10), nut sleeve (20), screw (30), spindle assembly and pressure spring (50) are included. The valve housing (10) has a housing chamber (11) and a valve port (12), The valve opening (12) is in communication with the containment chamber (11), The nut sleeve (20) is provided within the housing chamber (11) and is fixedly connected to the valve housing (10). The screw (30) has a first end and a second end that are opposite to each other, and is inserted into the nut sleeve (20) and screwed into the nut sleeve (20). The spindle assembly is provided corresponding to the valve port (12), The second end (32) of the screw is connected to the spindle assembly, The screw (30) drives the spindle assembly to seal or open the valve port (12), The pressure spring (50) is provided between the spindle assembly and the nut sleeve (20), and can bring the threads of the screw (30) and the threads of the nut sleeve (20) into close contact. The nut sleeve (20) has a first through hole (21) that extends along the axial direction. The first through hole (21) includes a threaded segment (211) and a guide segment (212), The screw segment (211) is provided spaced apart from the valve opening (12), A guide ring (60) is provided inside the guide segment (212) and is connected to at least a part of the valve housing (10). Both ends of the pressure spring (50) abut against the guide ring (60) and the spindle assembly, respectively. Electronic expansion valve.

2. The spindle assembly includes a first segment and a second segment, The outer diameter of the first segment of the spindle assembly is smaller than the outer diameter of the second segment of the spindle assembly. The second segment of the spindle assembly is provided in close proximity to the valve opening (12), The first segment of the spindle assembly is connected to the second end (32) of the screw and is movably provided within the guide ring (60). The pressure spring (50) is fitted to the outside of the first segment of the spindle assembly. One end of the pressure spring abuts against the guide ring (60), The other end of the pressure spring (50) abuts against one end of the second segment of the spindle assembly away from the valve port (12), as described in claim 1.

3. The spindle assembly includes a spindle body (42) and a spring sleeve (41), The spindle body (42) includes a connecting end (421) and a sealing end (422) that are provided opposite to each other. The aforementioned connection end (421) is connected to the spring sleeve (41), The spindle body (42) is provided in close proximity to the valve opening (12), The spring sleeve (41) forms the first segment of the spindle assembly. The spindle body (42) forms the second segment of the spindle assembly. The spring sleeve (41) is fitted with clearance to the guide ring (60), The pressure spring (50) is fitted to the outside of the spring sleeve (41), One end of the pressure spring (50) abuts against the connecting end (421), The electronic expansion valve according to claim 2, wherein the sealing end (422) is provided corresponding to the valve opening (12).

4. A connecting projection (4211) is provided on the end face of the connecting end (421). The electronic expansion valve according to claim 3, wherein the connecting projection (4211) is inserted into the spring sleeve (41) and fixedly connected to the inner wall of the spring sleeve (41).

5. The valve housing (10) includes a valve core sleeve (13), a valve seat (14), and a valve cover (15). The valve opening (12) is provided on the valve core sleeve (13), The valve seat (14) has a second through hole (143), The valve seat (14) has a first end and a second end that are facing each other, The second end (142) of the valve seat is fixedly connected to the valve core sleeve (13). The second through hole (143) communicates with the valve opening (12), The spindle body (42) is provided within the second through hole (143), The outer wall of the spindle body (42) is guide-engaged with the inner wall of the second through hole (143), A housing section (151) is provided inside the valve cover (15). The valve cover (15) has a first end and a second end that are facing each other, The second end (152) of the valve cover is fixedly connected to the first end (141) of the valve seat. The electronic expansion valve according to claim 3, wherein the housing portion (151) communicates with the second through hole (143), and the two together form the housing chamber (11).

6. An annular recess (423) is provided on the outer wall of the spindle body (42). An annular sealing ring (424) is provided within the annular recess (423). The electronic expansion valve according to claim 5, wherein the annular sealing ring (424) is used to seal the space between the inner wall of the second through hole (143) and the outer wall of the spindle body (42).

7. A limiting projection is further provided on the end face of the connecting end (421) of the spindle body (42). The limiting projection is provided in an annular shape on the outer circumference of the spring sleeve (41), The electronic expansion valve according to claim 3, wherein the pressure spring (50) is located inside the limiting projection.

8. The spindle assembly includes a spindle body (42), The valve housing (10) includes a valve seat (14) and a valve core (17), The spindle body (42) is mounted inside the valve seat (14). The valve core (17) is attached to one end of the valve seat (14) and has the valve opening (12), The hardness of the material of the valve core (17) is less than the hardness of the material of the spindle body (42). The end of the valve core (17) closest to the spindle body (42) is provided with a mounting contact surface (171) and a avoidance surface (172). A stepped structure is formed between the mounting contact surface (171) and the avoidance surface (172). The electronic expansion valve according to claim 1, wherein the inner wall surface (173) of the valve core (17) or the avoidance surface (172) forms a sealing surface, and the sealing surface and the outer wall surface of the spindle body (42) come into contact to form a soft seal structure.

9. The mounting contact surface (171) is provided protruding from the avoidance surface (172) to form the stepped structure, as described in claim 8.

10. A sealing contact portion (425) is provided at the end of the spindle body (42) closest to the valve core (17). The electronic expansion valve according to claim 8, wherein the sealing contact portion (425) contacts the sealing surface to form the soft seal structure and has an arc-shaped structure.

11. The electronic expansion valve according to claim 10, wherein the sealing contact portion (425) is located at the connection between the end of the spindle body (42) and the outer wall of the spindle body (42), and has an arc-shaped transition structure.

12. The valve core (17) is made of a non-metallic material. The electronic expansion valve according to claim 8, wherein the valve seat (14) and the mounting contact surface (171) come into contact to fix the valve core (17).

13. The valve seat (14) has a first mounting port and a second mounting port provided opposite to each other along the axial direction, and a communication passage that penetrates the valve seat (14) radially. The first mounting opening is located above the second mounting opening. The communication passage is provided in the side wall of the valve seat and is located between the first mounting opening and the second mounting opening. The cross-sectional area of ​​the second mounting opening is larger than the cross-sectional area of ​​the first mounting opening. The electronic expansion valve according to claim 8, wherein the outer shape of the second mounting port matches the outer shape of the valve core (17) so that the valve core (17) can be attached to the second mounting port.

14. The inner wall surface (173) of the valve core (17) is a tapered surface. The inner wall surface (173) of the valve core (17) forms the sealing surface. The valve core (17) has a first end and a second end that are provided opposite to each other. The electronic expansion valve according to claim 8, wherein the first end is located above the second end, and the flow area of ​​the sealing surface gradually decreases along the direction of extension from the first end to the second end.

15. The electronic expansion valve according to claim 8, wherein the spindle body (42) is provided with an equalization passage for equalizing the pressure at both ends of the spindle body (42).

16. The valve housing (10) further includes a valve core sleeve (13), At least a portion of the valve core sleeve (13) is installed inside the second mounting opening. The valve core sleeve (13) is located at one end of the valve core (17) away from the spindle body (42), The valve core sleeve (13) includes a main body portion (131) and a positioning portion (132), At least a portion of the main body (131) is inserted into the second mounting opening. The end of the main body portion (131) abuts against the end of the valve core (17), The positioning portion (132) is provided protruding from the outer wall of the main body portion (131), is used to abut against the end of the valve seat (14) for positioning, and is connected to the end of the valve seat (14) by welding, as described in claim 13.

17. The valve housing (10) includes a valve seat (14) and a valve core (17), The valve core (17) is attached to one end of the valve seat (14). The valve core (17) forms a valve opening. The spindle assembly includes a spindle body (42), a spring sleeve (41), and a buffer spring (45). The spindle body (42) is mounted inside the valve seat (14). The buffer spring (45) is installed inside the spring sleeve (41). The screw (30) is movably attached to one end of the spring sleeve (41). The other end of the spring sleeve (41) is connected to the spindle body (42), The electronic expansion valve further includes a guide ring (60), The guide ring (60) is provided on the valve seat (14), The guide ring (60) is provided with a guide passage, The spring sleeve (41) is provided so as to be movable within the guide passage along the extending direction of the guide passage, The valve seat (14) is provided with a first balancing hole (144), The electronic expansion valve according to claim 1, wherein the first balancing hole (144) is provided so as to penetrate the internal cavity of the valve seat (14) and the external space of the valve seat (14).

18. The electronic expansion valve further includes a pressing sleeve (120), The pressing sleeve (120) is provided on the valve seat (14) and protrudes from the end of the valve seat (14), has an annular structure, and is fitted to the outside of the spring sleeve (41). The pressing sleeve (120) and the valve seat (14) are either integrally molded or The pressing sleeve (120) and the valve seat (14) are separate structures. The valve housing (10) includes a valve cover (15), The opening of the valve cover (15) is connected to one end of the pressing sleeve (120) away from the valve seat (14), The screw (30) is movably provided within the valve cover (15), as described in claim 17.

19. The inner wall of the nut sleeve (20) abuts against the outer wall of the guide ring (60), The electronic expansion valve according to claim 18, wherein the nut sleeve (20) is provided with a first flow hole (22) that connects the internal cavity of the nut sleeve (20) to the external space of the nut sleeve (20), and a second flow hole (23) that connects the upper end cavity and the lower end cavity of the nut sleeve (20).

20. The end of the valve seat (14) closest to the guide ring (60) has a connecting end face. The aforementioned connecting end face is provided connected to the guide ring (60), The electronic expansion valve according to claim 17, wherein the first balancing hole (144) is located on the edge of the connecting end face.

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