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 priority to a patent application filed with the State Intellectual Property Office of the People's Republic of China on March 16, 2022, bearing application number 202220573034.X and titled Electric Valve, priority to a patent application filed with the State Intellectual Property Office of the People's Republic of China on March 17, 2022, bearing application number 202220586991.6 and titled Electric Valve, and priority to a patent application filed with the State Intellectual Property Office of the People's Republic of China on March 24, 2022, bearing application number 202220654238.6 and titled Electronic Expansion Valve.

[0002] TECHNICAL FIELD This application relates to the field of control valves, and in particular to electronic expansion valves. [Background technology]

[0003] At present, electronic expansion valves generally have a nut sleeve and a screw in the receiving chamber of a valve housing, the screw is screwed into the nut sleeve, and a 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 screw-threaded portion between the nut sleeve and the screw, and 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, and 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, so that when the screw rotates to the same position relative to the nut sleeve during the process of moving up and down, the position of the screw relative to the nut sleeve will be affected by the screw backlash and will cause an error, which will cause an error in the position of the spindle relative to the valve port, and will further reduce the accuracy of the flow control of the electronic expansion valve. Summary of the Invention

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

[0005] The present application provides an electronic expansion valve including a valve housing, a nut sleeve, a screw, a spindle assembly and a pressure spring, the valve housing having an accommodating chamber and a valve port, the valve port communicating with the accommodating chamber, a nut sleeve being arranged in the accommodating chamber, the nut sleeve being fixedly connected to the valve housing, the screw having a first end and a second end arranged opposite to each other, being inserted into the nut sleeve and screwed to the nut sleeve, the spindle assembly being arranged corresponding to the valve port, the second end of the screw being connected to the spindle assembly, the screw driving the spindle assembly to seal or open the valve port, and the pressure spring being arranged between the spindle assembly and the nut sleeve, capable of tightly fitting the threads of the screw and the threads of the nut sleeve. The use of a pressure spring can ensure that the position of the screw relative to the nut sleeve is not affected by thread play when the screw moves upward and downward, thereby ensuring that the degree to which the valve port of the spindle assembly is opened is not affected by thread play when the screw moves upward and downward, and further ensuring high accuracy of the flow control of the electronic expansion valve.

[0006] Further, the nut sleeve has a first through hole extending along the axial direction, the first through hole including a screw segment and a guide segment, the screw segment being spaced apart from the valve port, a guide ring connected to at least a portion of the valve housing being provided inside the guide segment, and both ends of the pressure spring abut against the guide ring and the spindle assembly, respectively.

[0007] Further, 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 disposed close to the valve port, the first segment of the spindle assembly is connected to the second end of the screw and is movably disposed within the guide ring, the pressure spring is fitted to the outside of the first segment of the spindle assembly, one end of the pressure spring abuts on the guide ring, and the other end of the pressure spring abuts on one end of the second segment of the spindle assembly away from the valve port. With 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 abut on the end faces of the guide ring and the first segment of the spindle assembly respectively, and the pressure spring is fitted to the first segment of the spindle assembly, so that the internal structure of the electronic expansion valve can be made compact, the occupied space can be reduced, the overall volume of the electronic expansion valve can be reduced, and the structural stability of the pressure spring can also be improved.

[0008] Further, the spindle assembly includes a spindle body and a spring sleeve, the spindle body includes a connection end and a sealing end provided opposite to each other, the connection end is connected to the spring sleeve, the spindle body is provided adjacent to the valve port, the spring sleeve forms a first segment of the spindle assembly, the spindle body forms a second segment of the spindle assembly, the spring sleeve is clearance-fitted to the guide ring, the pressure spring is fitted to the outside of the spring sleeve, one end of the pressure spring abuts against the connection end, and the sealing end is provided corresponding to the valve port. That is, the pressure spring is provided between the connection 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 the spindle body to move along the axial direction. In another embodiment, the pressure spring may be provided between the spring sleeve and the nut sleeve.

[0009] Furthermore, a connecting protrusion is provided on the end face of the connecting end, and the connecting protrusion is inserted into the spring sleeve and fixedly connected to the inner wall of the spring sleeve. Since the connecting protrusion is inserted into the spring sleeve and fixedly connected to the inner wall of the spring sleeve, the spindle body is stably connected to the inside of the spring sleeve, so that the structural stability of the spindle body and the spring sleeve is better. The connecting protrusion and the spring sleeve can be connected by welding.

[0010] Further, the valve housing includes a valve core sleeve, a valve seat and a valve cover, the valve port is provided in the valve core sleeve, the valve seat has a second through hole, the valve seat has a first end and a second end opposite to each other, the second end of the valve seat is fixedly connected to the valve core sleeve, the second through hole is connected to the valve port, the spindle body is provided in the second through hole, the outer wall of the spindle body is clearance-fitted to the inner wall of the second through hole, the valve cover has a accommodating part, the valve cover has a first end and a second end opposite to each other, the second end of the valve cover is fixedly connected to the first end of the valve seat, and the accommodating part is connected to the second through hole, and the two form an accommodating chamber. The outer wall of the spindle body is guided and engaged with the inner wall of the second through hole, so that the second through hole can guide the spindle body, and the coaxiality between the spindle body and the valve port is further improved. The first end of the valve cover is in a sealed state, that is, the top of the accommodating part is in a sealed state.

[0011] In addition, an annular recess is provided on the outer wall of the spindle body, and an annular sealing ring is provided in the annular recess, and the annular sealing ring is used to seal between the inner wall of the second through hole and the outer wall of the spindle body. The annular sealing ring can prevent fluid from entering between the spring sleeve and the second through hole, so as to prevent the pressure spring from being corroded by the fluid, and extend the service life of the pressure spring.

[0012] In addition, a limiting protrusion is further provided on the end face of the connecting end of the spindle body, the limiting protrusion is annularly provided on the outer periphery of the spring sleeve, and the pressure spring is located inside the limiting protrusion. By providing the limiting protrusion, the pressure spring can be positioned between the limiting protrusion and the spring sleeve to guide the pressure spring, thereby preventing the pressure spring from being twisted.

[0013] Further, the spindle assembly includes a spindle body, the valve housing includes a valve seat and a valve core, the spindle body is mounted in the valve seat, the valve core is mounted at one end of the valve seat, the valve core has a valve port, the hardness of the material of the valve core is less than the hardness of the material of the spindle body, an end of the valve core close to the spindle body is provided with a mounting contact surface and an avoidance surface, a step structure is formed between the mounting contact surface and the avoidance surface, the inner wall surface or the avoidance surface of the valve core forms a sealing surface, and the sealing surface comes into contact with the outer wall surface of the spindle body to form a soft seal structure.

[0014] Furthermore, the mounting contact surface is provided protruding from the avoidance surface to form a step structure.

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

[0016] Furthermore, the sealing contact is located at the connection between the end of the spindle body and the outer wall of the spindle body and is an arcuate transition structure.

[0017] Furthermore, the valve core is made of a non-metallic material, and the valve seat and the mounting contact surface abut against each other to fix the valve core.

[0018] Furthermore, the valve seat has a first mounting port and a second mounting port arranged opposite each other along the axial direction, and a communicating passage passing radially through the valve seat, the first mounting port being located above the second mounting port, the communicating passage being provided on a side wall of the valve seat and located between the first mounting port and the second mounting port, the cross-sectional area of ​​the second mounting port being larger than the cross-sectional area of ​​the first mounting port, and the outer shape of the second mounting port matching 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 a tapered surface forming a sealing surface, the valve core has a first end and a second end arranged opposite each other, the first end is located above the second end, and the flow area of ​​the sealing surface gradually becomes smaller along the extension direction from the first end to the second end.

[0020] Additionally, equalization passages are provided within the spindle body for equalizing pressure on both ends of the spindle body.

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

[0022] Further, the valve housing includes a valve seat and a valve core, the valve core is attached to one end of the valve seat and forms a valve port, the spindle assembly includes a spindle body, a spring sleeve and a buffer spring, the spindle body is attached in the valve seat, the buffer spring is attached in the spring sleeve, the screw is movably attached to one end of the spring sleeve, and the other end of the spring sleeve is connected to the spindle body, the electronic expansion valve further includes a guide ring, the guide ring is attached to the valve seat, the guide ring is provided with a guide passage, the spring sleeve is movably provided in the guide passage along the extension direction of the guide passage, the valve seat is provided with a first balancing hole, the first balancing hole is provided to penetrate between an internal cavity of the valve seat and an external space of the valve seat.

[0023] Furthermore, the guide ring and the valve seat may be of one-piece construction, or the guide ring and the valve seat may be of separate construction.

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

[0025] Furthermore, the electronic expansion valve further includes a nut sleeve, the inner wall of which abuts against the outer wall of the guide ring, and the nut sleeve is provided with a first communication hole connecting the inner cavity of the nut sleeve with the outer space of the nut sleeve, and a second communication hole connecting the upper end cavity and the lower end cavity of the nut sleeve.

[0026] Furthermore, the valve seat has a connecting end face at an end close to the guide ring, the connecting end face is provided connected to the guide ring, and the first balancing hole is located at the edge of the connecting end face, so that the first balancing hole forms a side opening hole structure.

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

[0028] When the technical aspect of the present application is applied, the valve housing has an accommodating chamber and a valve port, the nut sleeve is disposed in the accommodating 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 disposed between the spindle assembly and the nut sleeve. By using the above structure, the pressure spring can maintain the screw-engaged portion of the screw and the nut sleeve such that the upper surfaces of the threads of both always abut, or the lower surfaces of both threads always abut, so that in the process of the screw moving up or down relative to the nut sleeve, the position of the screw relative to the nut sleeve is not affected by the screw backlash, so that the degree of opening the valve port of the spindle assembly is not affected by the screw backlash, and further, when the screw rotates to the same position in the process of the screw moving up and down, it is possible to avoid the degree of opening the valve port of the spindle assembly being different, so that 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 that form a part of this application are intended to provide a further understanding of the application, and the schematic examples and their explanations are intended to interpret the application and are not intended to unduly limit the application.

[0030] [Figure 1] 1 shows a structural schematic diagram of an electronic expansion valve provided by an embodiment of the present application. [Diagram 2] 2 is a partially enlarged view of part A in FIG. 1. [Diagram 3] 1 is a schematic diagram of a partial structure of an electronic expansion valve provided in an embodiment of the present invention; [Figure 4] 4 shows an exploded view of the partial structure in FIG. 3. [Diagram 5] 2 is a schematic diagram of the mounting structure of a screw, a bearing and a spring sleeve provided in an embodiment of the present invention; [Figure 6] 2 is a schematic diagram showing the structure of a bearing provided in accordance with an embodiment of the present invention fitted onto a screw; [Figure 7] FIG. 4 shows a schematic diagram of the structure in FIG. 3 mounted on a mounting base.

[0031] Here, the above drawings include the following reference numbers: 10 valve housing, 11 receiving chamber, 12 valve port, 13 valve core sleeve, 131 body portion, 132 positioning portion, 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 receiving portion, 152 second end of valve cover, 153 first end of valve cover, 16 flow rate regulating ring, 17 valve core, 171 mounting contact surface, 172 avoidance surface, 173 inner wall surface, 20 nut sleeve, 21 first through hole, 211 screw segment, 212 guide segment, 22 first through hole, 23 second through hole, 30 screw, 31 first end of screw, 32 second end of screw, 41 spring sleeve, 411 second balancing hole, 42 spindle body, 421 connecting end, 4211 connecting protrusion, 422 sealing end, 423 annular recess, 424 annular sealing ring, 425 sealing contact portion, 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. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] Hereinafter, the technical aspects of the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, but it is clear that the described embodiments are only some of the embodiments of the present application, and are not all of the embodiments. Based on the embodiments of the present application, all other embodiments that a person skilled in the art can obtain without creative efforts all belong to the scope of protection of the present application.

[0033] As shown in Figures 1 and 2, the first embodiment of the present application provides an electronic expansion valve including 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 receiving chamber 11 and a valve port 12, the valve port 12 communicates with the receiving chamber 11, the nut sleeve 20 is disposed in the receiving chamber 11 and fixedly connected to the valve housing 10, the screw 30 has a first end and a second end disposed opposite to each other, the first end 31 of the screw is disposed 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 disposed 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, and the pressure spring 50 is disposed between the spindle assembly and the nut sleeve 20, so that the thread of the screw 30 and the thread of the nut sleeve 20 can be tightly fitted to each other. The pressure spring 50 always maintains a compressed or expanded state. In the present application, when the pressure spring 50 always maintains a compressed state, the pressure spring 50 can maintain the lower surface of the thread of the screw 30 always abutting against the lower surface of the thread of the nut sleeve 20, and when the pressure spring 50 always maintains an expanded state, the pressure spring 50 can maintain the upper surface of the thread of the screw 30 always abutting against the upper surface of the thread of the nut sleeve 20. Therefore, when the pressure spring 50 is used, the position of the screw 30 relative to the nut sleeve 20 can be prevented from being affected by the screw backlash during the process of the screw 30 moving upward and downward, so that the degree of opening the valve port of the spindle assembly can be prevented from being affected by the screw backlash during the process of the screw 30 moving upward and downward, and the accuracy of the flow control of the electronic expansion valve can be ensured.

[0034] When applying the technical aspects of the present application, the valve housing 10 has an accommodating chamber 11 and a valve port 12, the nut sleeve 20 is provided in the accommodating chamber 11, the screw 30 is screwed into the nut sleeve 20, 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, and the pressure spring 50 is provided between the spindle assembly and the nut sleeve 20. By using the above structure, the pressure spring 50 can maintain the screwing point between the screw 30 and the nut sleeve 20 such that the upper surfaces of the threads of both are always in contact with each other, or the lower surfaces of both are always in contact with each other, so that the position of the screw 30 relative to the nut sleeve 20 is not affected by the screw backlash when the screw 30 moves up and down relative to the nut sleeve 20, and the degree of opening the valve port 12 of the spindle assembly is not affected by the screw backlash. Furthermore, when the screw 30 moves up and down to the same position, it is possible to avoid the degree of opening the valve port 12 of the spindle assembly being different, thereby improving the accuracy of the flow control of the electronic expansion valve. Furthermore, the above technical aspect has the advantages of a simple structure, low manufacturing cost, and easy installation.

[0035] In this embodiment, the nut sleeve 20 has a first through hole 21 extending along the axial direction, 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, the guide ring 60 connected to at least a part of the valve housing 10 being provided inside the guide segment 212, and both ends of the pressure spring 50 abut against 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 abut against 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 receiving chamber 11. Alternatively, the guide ring 60 may be connected to the nut sleeve 20 by welding, or 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 is smaller than the outer diameter of the second segment of the spindle assembly, the second segment of the spindle assembly is provided close to the valve orifice 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, and the other end of the pressure spring 50 abuts against one end of the second segment of the spindle assembly away from the valve orifice 12. The guide ring 60 is used to guide the first segment of the spindle assembly. With 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 faces of the first segment of the spindle assembly, respectively, and the pressure spring 50 is fitted into the first segment of the spindle assembly, thereby making the internal structure of the electronic expansion valve compact, reducing the space it occupies, and reducing the overall volume of the electronic expansion valve, and also improving 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 adjacent to the valve port 12, the spring sleeve 41 forms a first segment of the spindle assembly, the spindle body 42 forms a 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 on 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. Also, 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 another embodiment, 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 disposed in the spring sleeve 41, and 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, and 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 together with the screw 30, while the outer ring 432, the spring sleeve 41 and the spindle body 42 do not rotate together with the screw 30, thereby reducing the friction between the outer ring 432, the spring sleeve 41 and the spindle body 42 and other components, and prolonging 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 the screw 30 from tilting when the bearing 43 moves axially together with the screw 30, thereby improving the coaxiality between the screw 30 and the valve port 12, and further improving 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 in sequence along the axial direction, the buffer spring 45 is arranged adjacent to the valve port 12, the connecting member 44 and the buffer spring 45 are both located in the spring sleeve 41, the connecting member 44 includes a first segment and a second segment, the second segment 442 of the connecting member is arranged adjacent to the valve port 12, the diameter of the first segment 441 of the connecting member is larger than the diameter of the second segment 442 of the connecting member, the first segment 441 of the connecting member abuts on the outer ring 432, one end of the buffer spring 45 is fitted on the outside of the second segment 442 of the connecting member and abuts on the end face of the first segment 441 of the connecting member, and the other end of the buffer spring 45 abuts on the spindle body 42. The above structural arrangement can improve the structural stability between the connecting member 44, the buffer spring 45 and the outer ring 432, and therefore the structural stability of the entire spindle assembly can be improved. The connecting member 44 is used to connect the buffer spring 45 and the outer ring 432, and optionally, a through hole is provided inside the connecting member 44, which is used to avoid the inner ring 431 and the second end 32 of the screw. The buffer spring 45 is used to relieve the thrust between the screw 30 and the spindle body 42, and prevents the screw 30 from continuing to move downward and excessively pressing the spindle body 42 after the spindle body 42 seals the valve port 12.

[0040] Specifically, a connection protrusion 4211 is provided on the end face of the connection end 421, and the connection protrusion 4211 is inserted into the spring sleeve 41 and fixedly connected to the inner wall of the spring sleeve 41. Since the connection protrusion 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 to the inside of the spring sleeve 41, thereby improving the structural stability of the spindle body 42 and the spring sleeve 41. The connection protrusion 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, the valve seat 14 has a first end and a second end opposite to each other, 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 guided and engaged with the inner wall of the second through hole 143, and the valve cover 15 has an accommodating portion 151, the valve cover 15 has a first end and a second end opposite to each other, the second end 152 of the valve cover is fixedly connected to the first end 141 of the valve seat, and the accommodating portion 151 communicates with the second through hole 143, and the two form an accommodating chamber 11. 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 surface of the first end 141 of the valve seat, which can facilitate the installation of the nut sleeve 20. The outer wall of the spindle body 42 is guided and engaged with the inner wall of the second through hole 143, so that the second through hole 143 can guide the spindle body 42, and the coaxiality between the spindle body 42 and the valve port 12 is further improved. The first end 153 of the valve cover is in a sealed state, that is, the top of the accommodating part 151 is in a sealed state. In this embodiment, a flow regulating ring 16 and a valve core 17 are provided between the valve core sleeve 13 and the valve seat 14, the flow regulating ring 16 is provided adjacent to the valve seat 14 and is located outside the spindle body 42, the valve core 17 is provided adjacent to the valve port 12, and the spindle body 42 abuts against the valve core 17 when sealing the valve port 12, and the valve core 17 can be a soft seal gasket. The flow regulating ring 16 has a flow through hole, which is arranged 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 realize a soft seal of the valve port 12 to prevent the inside of the electronic expansion valve from leaking when the valve port 12 is in a closed state.

[0042] In this embodiment, the guide ring 60 is integral with the valve seat 14, the guide ring 60 is provided with a communication hole, and the regions above and below the guide ring 60 in the receiving chamber 11 communicate with each other 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 in the annular recess 423, and the annular sealing ring 424 is used to seal between the inner wall of the second through hole 143 and the outer wall of the spindle body 42. The annular sealing ring 424 is provided in the annular recess 423, so that the annular sealing ring 424 can be prevented from being separated from the spindle body 42. The annular sealing ring 424 can be provided to prevent fluid from entering between the spring sleeve 41 and the second through hole 143, so that the corrosion of the pressure spring caused by the fluid is prevented, and the service life of the pressure spring is extended.

[0043] In this embodiment, a limiting protrusion is further provided on the end face of the connection end 421 of the spindle body 42, the limiting protrusion is annularly provided on the outer periphery of the spring sleeve 41, and the pressure spring 50 is located inside the limiting protrusion. By providing the limiting protrusion, the pressure spring 50 can be positioned between the limiting protrusion and the spring sleeve 41 to guide the pressure spring 50, thereby preventing the pressure spring 50 from being twisted.

[0044] As shown in FIG. 3 to FIG. 7, the second embodiment of the present application provides an electronic expansion valve, which further includes a valve core 17 and a driving assembly, and the spindle body 42 is mounted in the valve seat 14. The valve core 17 is mounted in the valve seat 14 and attached to one end of the valve seat 14. The valve core 17 is fitted into the spindle body 42 to form a valve port, specifically, the hollow structure of the valve core 17 forms the valve port. The driving assembly drives the spindle body 42 to move in the axial direction to open and close the valve port. Here, the hardness of the material of the valve core 17 is smaller than that of the material of the spindle body 42, and the end of the valve core 17 close to the spindle body 42 is provided with a mounting contact surface 171 and an avoidance surface 172, and a step structure is 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 contacts the outer wall surface of the spindle body 42 to form a soft seal structure. Specifically, the mounting contact surface 171 is adapted to engage and contact other components of the electronic expansion valve and to position the mounting contact surface 171 with 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 smaller than that of the spindle body 42, it is easy to form a soft seal structure between the sealing surface and the outer wall surface of the spindle body 42, and this soft seal structure can effectively avoid leakage between the valve core 17 and the valve seat 14, so as to improve the sealing performance of the electronic expansion valve. In addition, since a step 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 contact and position the valve core 17 through the mounting contact surface 171, and further, the mounting contact surface 171 is mounted and compressed to avoid deformation of the avoidance surface 172 or the inner wall surface 173 of the valve core 17 during installation, so that the sealing surface is not deformed, and the impact of the pressing mounting force on the sealing surface is reduced, so that the sealing performance of the electronic expansion valve is better improved. In addition, since the mounting contact surface and the sealing surface are not the same surface or directly connected, it is possible to avoid the influence on the sealing surface caused by thermal expansion and cold contraction when the material of the valve core 17 contacts with other components of the electronic expansion valve, and further improve the sealing performance of the electronic expansion valve. Therefore, the technical aspect provided by this embodiment can solve the technical problem of the poor sealing performance of the electronic expansion valve in the prior art.

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

[0047] In this embodiment, the end of the spindle body 42 close to the valve core 17 is provided with a sealing contact part 425, which is in contact with the sealing surface to form a soft seal structure and has an arc-shaped structure. With this structural arrangement, since the hardness of the material of the valve core 17 is lower than that of the spindle body 42, the sealing contact part 425 has an arc-shaped structure, which can prevent the valve core 17 from being damaged by the spindle body 42, and can extend the durability and service life of the valve core.

[0048] Preferably, the sealing contact part 425 in this embodiment is located at the connection part between the end of the spindle body 42 and the outer wall of the spindle body 42, and is an arc-shaped transition structure. This structural arrangement can better prevent the valve core 17 from being damaged by the spindle body 42, improve the self-centering effect, improve the sealing performance at the valve port, reduce the wear on the valve core 17, better improve the durability of the valve core 17, and even effectively prolong 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 surface (the end surface may refer to the upper end surface or the lower end surface, or the upper end surface and the lower end surface) of the valve core 17 forms a sealing surface, and the sealing surface and the outer wall surface of the spindle body 42 form a soft seal structure. With 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 avoid leakage between the valve core 17 and the valve seat 14, and improve the sealing performance of the electronic expansion valve. Specifically, the valve core 17 in this embodiment 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 metallic material are installed, the non-metallic material is a soft material compared to the metallic material, so that the hard material and the soft material are installed together to improve the sealing performance. In addition, 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, and the sealing performance of the electronic expansion valve can be better improved.

[0050] In this embodiment, in order to improve the restricting stability of the valve core 17 and prevent the valve core 17 from rattling during the operation, the valve seat 14 and the mounting contact surface 171 can be abutted to fix the valve core 17.

[0051] Specifically, in order to better 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 provided opposite to each other along the axial direction, and the valve seat 14 is further provided with a communication passage penetrating the valve seat 14 in the radial direction, the first mounting port is located above the second mounting port, the communication passage is provided on the side wall of the valve seat 14 and is located between the first mounting port and the second mounting port, 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 valve core 17 can be directly attached from the second mounting port during installation, making the installation operation easier. Since the valve core 17 can be attached from the second mounting port, the valve core can be made large in diameter, thereby achieving a large flow rate.

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

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

[0055] In this embodiment, an equalizing passage is provided in the spindle body 42 to equalize 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 to better improve the sealing performance and achieve pressure equalization at the upper and lower ends of the spindle in the closed state. 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 installed in 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 located 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, and a soft seal is formed between the valve core 17 and the valve seat 14, so that the friction force between the valve core 17 and the screw 30 is smaller than the friction force between the valve core 17 and the valve seat 14, and the wear problem of the soft seal valve port is avoided.

[0057] In this embodiment, the drive assembly of the electronic expansion valve includes a rotor assembly and a nut assembly, the rotor assembly is fitted to the outside of the nut assembly, one end of the screw 30 remote from the spindle body 42 is fixedly connected to the rotor assembly, and the rotor assembly adjusts the opening of the valve port by moving the spindle body 42 axially via the screw. A female thread is provided in the nut assembly to be 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 part of which is mounted in the second mounting hole, 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 traditional integrated structure of the valve seat 14 is changed to a separate structure, which facilitates the installation operation. 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 hole as long as 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 131 and a positioning portion 132, at least a part of the main body 131 is inserted into the second mounting hole, and an end of the main body 131 abuts against an end of the valve core 17. The positioning portion 132 protrudes from the outer wall of the main body 131 and is used for abutting against an end of the valve seat 14 for positioning. Such a structural arrangement facilitates a good positioning operation for the valve core 17, and can improve the installation stability of the valve core 17.

[0060] Preferably, for ease of production and manufacturing, the body portion 131 and the positioning portion 132 in this embodiment are of a one-piece molded structure.

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

[0062] Specifically, the electronic expansion valve in this embodiment further includes a mounting base 100, which has a mounting passage, and the valve seat 14, the valve core 17 and the valve core sleeve 13 are all mounted in 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, the second sealing member 70 may be provided between the mounting base 100 and the valve seat 14, and the 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 this structural arrangement, the sealing performance of the electronic expansion valve can be better improved.

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

[0065] In order to solve the leakage problem, the valve core 17 in this embodiment is a soft seal material. In order to achieve a large flow rate and internal balance (easy to open the valve), the valve assembly is an inverted mounting structure, that is, the valve core 17 is assembled from the bottom up, and the valve seat structure is a separate structure (the valve seat structure includes a valve seat and a valve core sleeve, and the valve seat and the valve core sleeve are two parts to form a separate structure), and the valve seat 14, the valve core 17 and the valve core sleeve 13 are provided to solve the problem of valve port leakage. In this embodiment, the valve core 17 is a large diameter structure, and there is basically no relative movement between the valve core 17 and the spindle body 42, so that the friction between the valve core 17 and the spindle body 42 is reduced, and the wear of the valve core 17, which is a soft seal material, is prevented.

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

[0067] With the electronic expansion valve provided in this embodiment, the guide ring 60 is provided, and the guide ring 60 is provided with a guide passage, which facilitates the movement of the spring sleeve 41 along the extending direction of the guide passage, thereby facilitating the restriction of the moving direction of the spring sleeve 41, and preventing deviations in the movement of the spring sleeve 41, and further preventing deviations in the movement of the spindle body 42, preventing the spindle body 42 from rattling, and improving the stability of the movement of the spindle body 42. Preferably, the gap between the wall surface of the guide passage and the outer wall of the spring sleeve 41 can be controlled within a small and reasonable range to realize the role of restricting and guiding the guide passage for the spring sleeve 41. Furthermore, by providing the first balancing hole 144, the upper end cavity of the valve seat 14 can be connected to the internal cavity of the valve seat 14, and the pressure of the upper end cavity of the valve seat 14 can be balanced with the pressure of the internal cavity of the valve seat 14, thereby improving the speed of equalization of the pressure in the upper cavity of the spindle body 42 and achieving rapid balance, and avoiding the difficulty of opening and closing due to abrupt changes in pressure. Therefore, the technical aspect provided by this embodiment can solve the technical problem of low motion stability of the spindle of the electronic expansion valve in the prior art.

[0068] Specifically, in order to further improve the coaxiality, the guide ring 60 and the valve seat 14 are formed as an integral structure, or, in order to facilitate processing and installation, the guide ring 60 and the valve seat 14 are formed as separate structures.

[0069] In this embodiment, the electronic expansion valve further includes a pressing sleeve 120 and a valve cover 15 (which may be referred to as a sleeve), where the pressing sleeve 120 is disposed on the valve seat 14 and protrudes from an 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 disposed within the valve cover 15. Using such a structural arrangement, the installation stability of the valve cover 15 can be improved.

[0070] Specifically, in order to better improve the installation stability of the structure, the pressing sleeve 120 and the valve seat 14 are formed as an integral structure, or in order to facilitate processing and installation, the pressing sleeve 120 and the valve seat 14 are formed as 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, so that the nut sleeve 20 can be guided and installed by the guide ring 60 during installation, and the coaxiality between the spindle body 42 and the valve port is improved. Specifically, the end of the valve seat 14 close to the guide ring 60 has a connecting end face, which is connected to the guide ring 60, and the first balancing hole 144 is located at the edge of the connecting end face, so that the first balancing hole 144 forms a side opening hole structure. By processing the side opening hole structure from the edge of the connecting end face, the first balancing hole can be prevented from generating burrs facing the chamber of the valve seat 14, so as to solve the problem of burrs damaging the spindle and affecting the opening and closing of the spindle. Specifically, the first balancing hole 144 is located at the edge of the connecting end face away from the guide ring 60.

[0072] Specifically, in this embodiment, the side wall of the spring sleeve 41 is provided with a second balancing hole 411. With this structural arrangement, the second balancing hole 411 can connect the valve port with the internal cavity of the valve seat 14, and then the first balancing hole 144 connects the valve port with the rotor chamber, which is the chamber surrounded by the valve cover 15, so that it is easier to quickly balance the upper and lower pressures of the spindle, and the unbalanced pressure experienced by the spindle body 42 when the pressure suddenly changes is reduced.

[0073] In this embodiment, the nut sleeve 20 is provided with a first communication hole 22 that communicates the internal cavity of the nut sleeve 20 with the outer space of the nut sleeve 20, and a second communication hole 23 that communicates the upper end cavity with the lower end cavity of the nut sleeve 20. 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 realizes communication between the rotor chamber and the valve port through multiple communication passages so that the upper and lower pressures of the spindle body 42 can be quickly balanced. The rotor chamber may communicate with the valve port through the first through 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 communicate with the valve port through the second through 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 communicate with the valve port through the second through 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 noted that the upper and lower ends referred to in this embodiment are both in accordance with the direction of the structure depicted in the drawings, 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 embodiments of the present invention achieve the technical effects of reducing leakage and improving the sealing effect of the electronic expansion valve.

[0076] It should be noted that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and further, when the terms "comprise" and / or "comprise" are used herein, it is to be understood that features, steps, operations, devices, assemblies, and / or combinations thereof are present.

[0077] Unless otherwise specifically described, the relative arrangement of the components and steps, the formulas and values ​​described in these embodiments do not limit the scope of the present application. At the same time, it should be understood that for convenience of description, the dimensions of each part shown in the drawings are not drawn in actual proportion. Detailed descriptions of techniques, methods and equipment already known to those skilled in the art may be omitted, but the techniques, methods and equipment should be considered as part of the approved specification, as necessary. In all examples shown and described herein, any specific values ​​should be interpreted as being merely illustrative and not limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar symbols and letters represent similar things in the following drawings, so that once something is defined in one drawing, there is no need to further describe it in the subsequent drawings.

[0078] In the description of this application, orientations or positional relationships expressed by orientation terms such as "front, back, up, down, left, right", "lateral, longitudinal, vertical, horizontal", "top, bottom", etc. are generally based on the orientations or positional relationships shown in the drawings, but this is merely for the ease and simplicity of the description of this application, and unless otherwise stated, these orientation terms do not indicate or imply that the devices or elements shown necessarily have a specific orientation or are constructed and operated in a specific orientation, and should not be understood as limiting the scope of protection of this application, and orientation terms such as "inside, outside" are inside and outside with respect to the contour of each member itself.

[0079] For ease of description, spatially relative terms such as "above," "upper," "on top of," "above," and the like may be used herein to describe the spatial location of one device or feature relative to another device or feature as depicted in the figures. It should be understood that the spatially relative terms are intended to encompass different orientations during use or operation other than the orientation depicted in the figures of the device. For example, if a device in the figures is turned upside down, a device described as "above other devices or structures" or "on top of other devices or structures" would then be positioned "below other devices or structures" or "below other devices or structures." Thus, the exemplary term "above" can include two orientations: "above" and "below." The device can also be positioned in other different ways (rotated 90 degrees or positioned in other orientations) and a corresponding interpretation made of the spatially relative descriptions used herein.

[0080] It should be further explained that the use of terms such as "first", "second", etc. to define parts is merely intended to distinguish corresponding parts, and unless otherwise specified, the above terms have no special meaning and should not be understood as limiting the scope of protection of the present application.

[0081] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Those skilled in the art can make various modifications and variations to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. The valve housing (10), the nut sleeve (20), the screw (30), the spindle assembly and the pressure spring (50), The valve housing (10) has a receiving chamber (11) and a valve port (12), The valve port (12) communicates with the receiving chamber (11); The nut sleeve (20) is disposed within the receiving chamber (11) and is fixedly connected to the valve housing (10); The screw (30) has a first end and a second end provided 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), A 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 with each other. Electronic expansion valve.

2. The nut sleeve (20) has a first through hole (21) extending along the axial direction, The first through hole (21) includes a screw segment (211) and a guide segment (212); The screw segment (211) is spaced apart from the valve port (12); A guide ring (60) is provided inside the guide segment (212) and connected to at least a portion of the valve housing (10); 2. The electronic expansion valve of claim 1, wherein both ends of the pressure spring abut against the guide ring and the spindle assembly, respectively.

3. the spindle assembly includes a first segment and a second segment; an outer diameter of the first segment of the spindle assembly is smaller than an outer diameter of the second segment of the spindle assembly; the second segment of the spindle assembly is disposed adjacent the valve orifice (12); a first segment of the spindle assembly connected to a second end (32) of the screw and movably mounted 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); 3. The electronic expansion valve of claim 2, wherein the other end of the pressure spring (50) abuts against an end of the second segment of the spindle assembly remote from the valve orifice (12).

4. 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 connection end (421) is connected to the spring sleeve (41); The spindle body (42) is provided adjacent to the valve port (12), The spring sleeve (41) forms a first segment of the spindle assembly; The spindle body (42) forms a second segment of the spindle assembly; The spring sleeve (41) is clearance-fitted into 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 connection end (421), The electronic expansion valve according to claim 3 , wherein the sealing end (422) is provided corresponding to the valve port (12).

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

6. 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), A second through hole (143) is provided in the valve seat (14), The valve seat (14) has a first end and a second end disposed opposite 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 port (12), The spindle body (42) is provided in the second through hole (143), The outer wall of the spindle body (42) is guided and engaged with the inner wall of the second through hole (143), A storage section (151) is provided within the valve cover (15), The valve cover (15) has a first end and a second end provided opposite to each other, a second end (152) of the valve cover fixedly connected to a first end (141) of the valve seat; The electronic expansion valve according to claim 4, wherein the receiving portion (151) communicates with the second through hole (143), and the two form the receiving chamber (11).

7. The outer wall of the spindle body (42) is provided with an annular recess (423), An annular sealing ring (424) is provided within the annular recess (423); 7. The electronic expansion valve according to claim 6, wherein the annular sealing ring (424) is used for sealing between an inner wall of the second through hole (143) and an outer wall of the spindle body (42).

8. A limiting protrusion is further provided on the end surface of the connection end (421) of the spindle body (42), The limiting protrusion is provided annularly on the outer periphery of the spring sleeve (41), The electronic expansion valve according to claim 4, wherein the pressure spring (50) is located inside the limiting protrusion.

9. 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 within the valve seat (14); The valve core (17) is attached to one end of the valve seat (14) and has the valve port (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 valve core (17) is provided at its end close to the spindle body (42) with a mounting contact surface (171) and an avoidance surface (172); A step structure is formed between the mounting contact surface (171) and the avoidance surface (172), 2. The electronic expansion valve as claimed in 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 contacts with the outer wall surface of the spindle body (42) to form a soft seal structure.

10. The electronic expansion valve according to claim 9, wherein the mounting contact surface (171) is provided to protrude from the avoidance surface (172) to form the stepped structure.

11. The spindle body (42) is provided with a sealing contact portion (425) at an end thereof close to the valve core (17); 10. The electronic expansion valve as claimed in claim 9, wherein the sealing contact portion (425) contacts the sealing surface to form the soft seal structure and has an arc-shaped structure.

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

13. The valve core (17) is made of a non-metallic material, The electronic expansion valve according to claim 9, wherein the valve seat (14) and the mounting contact surface (171) abut against each other to fix the valve core (17).

14. 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 radially penetrates the valve seat (14), The first mounting opening is located above the second mounting opening, the communication passage is provided in a side wall of the valve seat and is located between the first mounting port and the second mounting port, The cross-sectional area of ​​the second mounting hole is larger than the cross-sectional area of ​​the first mounting hole, 10. The electronic expansion valve according to claim 9, wherein the outer shape of the second mounting hole corresponds to the outer shape of the valve core (17) so that the valve core (17) can be mounted in the second mounting hole.

15. 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 provided opposite to each other, 10. The electronic expansion valve according to claim 9, wherein the first end is located above the second end, and a flow area of ​​the sealing surface gradually decreases along an extension direction from the first end to the second end.

16. 10. The electronic expansion valve of claim 9, wherein an equalization passage is provided within the spindle body (42) for equalizing pressure across the spindle body (42).

17. The valve housing (10) further includes a valve core sleeve (13), At least a portion of the valve core sleeve (13) is mounted within the second mounting hole; The valve core sleeve (13) is located at one end of the valve core (17) remote from the spindle body (42), The valve core sleeve (13) includes a body portion (131) and a positioning portion (132), At least a portion of the main body portion (131) is inserted into the second mounting hole, An end of the body portion (131) abuts against an end of the valve core (17), The electronic expansion valve according to claim 14, wherein the positioning portion (132) is provided protruding from an outer wall of the main body portion (131), is used to abut against an end of the valve seat (14) for positioning, and is connected to the end of the valve seat (14) by welding.

18. 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 orifice, The spindle assembly includes a spindle body (42), a spring sleeve (41) and a buffer spring (45); The spindle body (42) is mounted within the valve seat (14); The damping spring (45) is mounted within 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 in the guide passage so as to be movable in the extending direction of the guide passage, The valve seat (14) is provided with a first balancing hole (144), 2. The electronic expansion valve of claim 1, wherein the first balancing hole (144) is disposed to extend through an inner cavity of the valve seat (14) and an outer space of the valve seat (14).

19. The electronic expansion valve further includes a pressing sleeve (120); The pressing sleeve (120) is provided on the valve seat (14) and protrudes from an end of the valve seat (14), has an annular structure, and is fitted onto the outside of the spring sleeve (41); The pressure sleeve (120) and the valve seat (14) are of one-piece construction, 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 pressure sleeve (120) remote from the valve seat (14); 19. The electronic expansion valve according to claim 18, wherein the screw (30) is movably mounted within the valve lid (15).

20. 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 19, wherein the nut sleeve (20) is provided with a first flow hole (22) that connects an internal cavity of the nut sleeve (20) with an external space of the nut sleeve (20), and a second flow hole (23) that connects an upper end cavity with a lower end cavity of the nut sleeve (20).

21. The valve seat (14) has a connecting end face at an end close to the guide ring (60), The connecting end surface is connected to the guide ring (60), 20. The electronic expansion valve of claim 18, wherein the first balancing holes (144) are located at an edge of the connecting end face.

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