Electronic Expansion Valve

Abstract

An electronic expansion valve comprising: a valve seat member (10); a large gasket (20) disposed within a cavity of the valve seat member, the large gasket (20) having a large valve port (21), and made of a soft material; and a valve needle member (30) disposed within the cavity of the valve seat member, the valve needle member comprising a small valve needle (31), a large valve needle portion (32) and a small gasket (33), the small gasket disposed within the large valve needle portion, the small valve port (331), and made of a soft material, wherein the large valve needle portion is used to open and close the large valve port in cooperation with the large gasket, and the small valve needle is used to adjust the opening degree of the small valve port in cooperation with the small gasket. With this electronic expansion valve, both the large and small gaskets are made of soft materials, and a soft sealing method is used to solve the problem of the poor sealing effect of the electronic expansion valve. In addition, the small valve needle and the small gasket are set to work together to adjust the opening of the small valve port, thereby realizing the adjustment of small flow rates, and the large valve needle part and the large gasket are set to work together to open and close the large valve port, thereby realizing large flow rates.

Description

[Technical Field]

[0001] This application claims priority to a patent application for an invention entitled "Electronic Expansion Valve" filed on January 30, 2022 with the State Intellectual Property Office of the People's Republic of China, application number 202210114497.4, and a patent application for an invention entitled "Valve Needle Member and Electronic Expansion Valve" filed on January 30, 2022 with the State Intellectual Property Office of the People's Republic of China, application number 202220250089.7 ... Priority is claimed to the patent application for an invention titled "Electronic Expansion Valve", application number 202220250087.8, filed with the State Intellectual Property Office of the People's Republic of China on January 30, 2022, claiming priority to the patent application for an invention titled "Electronic Expansion Valve", application number 202220250108.6, filed with the State Intellectual Property Office of the People's Republic of China on January 30, 2022, claiming priority to the patent application for an invention titled "Electronic Expansion Valve", application number 202220249819.1, filed with the State Intellectual Property Office of the People's Republic of China on January 30, 2022.

[0002] The present application relates to the technical field of electronic expansion valves, and more particularly to electronic expansion valves. [Background technology]

[0003] Currently, various refrigeration and heating appliances, such as air conditioners, refrigerators, and heat pump water heaters, typically use electronic expansion valves to regulate fluid flow. Electronic expansion valves typically include a valve seat member, a valve needle member, and a large gasket. The large gasket is equipped with a large valve port, and the valve needle member is equipped with a small valve port. The valve needle member is moved to open or close the large valve port or adjust the opening of the small valve port, thereby achieving circulation control. Conventional electronic expansion valves use hard seals to seal both the large and small valve ports, resulting in poor sealing performance and prone to leakage, making it difficult to ensure accurate flow control. Summary of the Invention [Problem to be solved by the invention]

[0004] The present application provides an electronic expansion valve to solve the problem of poor sealing effect of the electronic expansion valve in the prior art. [Means for solving the problem]

[0005] In order to solve the above problems, the present application provides an electronic expansion valve including: a valve seat member; a large gasket, the large gasket being disposed in a cavity of the valve seat member, having a large valve port, and made of a soft material; and a valve needle member, the valve needle member being disposed in the cavity of the valve seat member, the valve needle member including a small valve needle, a large valve needle portion, and a small gasket, the small gasket being disposed in the large valve needle portion, having a small valve port, and made of a soft material, wherein the large valve needle portion is used to open and close the large valve port in cooperation with the large gasket, and the small valve needle is used to adjust the opening degree of the small valve port in cooperation with the small gasket.

[0006] Furthermore, the minor valve orifice is configured in a tapered shape, with the small opening end of the minor valve orifice facing the major valve orifice.

[0007] Furthermore, the end face of the large valve port is a sealing flat surface, and when one end of the large valve needle portion abuts against the sealing flat surface, the large valve port is closed.

[0008] Furthermore, the small gasket is made of plastic or rubber, and the large gasket is made of plastic or rubber.

[0009] Furthermore, the large valve needle portion is provided with a guide hole, which is located on the opposite side of the small valve orifice from the large valve orifice, and the small valve needle is inserted through the guide hole so as to be axially movable, and the valve needle member further includes a first inner seal ring, which is located between the outer wall of the small valve needle and the inner wall of the guide hole.

[0010] Furthermore, the large valve needle portion is axially movably disposed within the cavity of the valve seat member, and the valve needle member further includes a second inner seal ring, which is disposed between the inner wall of the valve seat member and the outer wall of the large valve needle portion.

[0011] Furthermore, the valve needle member further includes a drive assembly, the drive assembly including a screw and a connecting sleeve, one end of the connecting sleeve being connected to the valvelet needle, the screw and the connecting sleeve being axially constrainedly connected, and the screw being arranged to be axially movable so as to drive movement of the valvelet needle.

[0012] Additionally, the drive assembly further includes a rolling structure disposed within the coupling sleeve, the coupling sleeve and the screw being respectively coupled to the rolling structure such that the coupling sleeve does not rotate with the screw.

[0013] Furthermore, the end of the valve needle away from the valve port is inserted into the connecting sleeve and fixedly connected to the connecting sleeve, the rolling structure is a bearing, and the drive assembly further includes a bushing and an elastic element provided in the connecting sleeve, the bearing is fitted onto one end of the screw, one side of the bearing is axially restrictively connected to the connecting sleeve, and the other side of the bearing, the bushing, and the elastic element abut against the valve needle in sequence.

[0014] Furthermore, opposing first and second locking surfaces are provided within the valve needle member, and the first and second locking surfaces limit the range of movement of the valvelet needle, and the screw is capable of driving the individual movement of the valvelet needle within a predetermined stroke, and the screw is also capable of driving the movement of the large valve needle portion via the valvelet needle.

[0015] Furthermore, the electronic expansion valve further includes a reinforcing seal ring, which is disposed between the large gasket and the inner wall of the valve seat member.

[0016] Furthermore, the electronic expansion valve further includes a large position regulating structure provided in the cavity of the valve seat member, and the large position regulating structure abuts against the side of the large gasket facing the large valve needle portion so as to press against the large gasket.

[0017] Furthermore, the electronic expansion valve further includes a small position restricting structure provided in the large valve needle portion, the small position restricting structure abutting against the small gasket on the side opposite to the small valve needle.

[0018] Furthermore, a position control groove is provided in the large valve needle portion, the opening of the position control groove faces the small position control structure, the thickness of the small gasket is greater than the depth of the position control groove, and the small position control structure abuts against the side of the small gasket protruding from the position control groove.

[0019] According to the technical solution of the present application, there is provided an electronic expansion valve including: a valve seat member; a large gasket, the large gasket being disposed in a cavity of the valve seat member, having a large valve port, and made of a soft material; and a valve needle member, the large gasket being disposed in the cavity of the valve seat member, the valve needle member including a small valve needle, a large valve needle part, and a small gasket, the small gasket being disposed in the large valve needle part, having a small valve port, and made of a soft material, wherein the large valve needle part is used to open and close the large valve port in cooperation with the large gasket, and the small valve needle is used to adjust the opening degree of the small valve port in cooperation with the small gasket. According to this solution, because both the large gasket and the small gasket are made of a soft material, a soft seal is achieved with both the large valve port and the small valve port, and the soft sealing method can increase the effective contact area during sealing, solve the problem of poor sealing effect of the electronic expansion valve, and avoid leakage. A small valve needle is provided to adjust the opening of the small valve port in cooperation with the small gasket, thereby realizing adjustment of small flow rates, and a large valve needle is provided to open and close the large valve port in cooperation with the large gasket, thereby realizing large flow rates.

[0020] The accompanying drawings of the specification that form a part of this application are used to provide a further understanding of the application, and the schematic examples and description of the application are used to explain the application and are not intended to unduly limit the application. [Brief explanation of the drawings]

[0021] [Figure 1] 1 shows a first cross-sectional view of an electronic expansion valve provided by an embodiment of the present application. [Figure 2] 2 shows a cross-sectional view of the valvelet needle and small gasket of FIG. 1. [Figure 3] 2 shows a cross-sectional view of the large valve needle and large gasket of FIG. 1. [Figure 4] 1 shows a cross-sectional view of a valve needle member provided by an embodiment of the present application. [Figure 5] 5 is a cross-sectional view of the large valve needle portion, the first inner seal ring, the first pressing means, and the second pressing means of FIG. 4. FIG. [Figure 6] 5 shows a cross-sectional view of the major valve needle portion of FIG. 4. [Figure 7] 5 shows a cross-sectional view of the second pressing means of FIG. 4. [Figure 8] 2 shows a second cross-sectional view of an electronic expansion valve provided by an embodiment of the present application. [Figure 9] 9 shows a cross-sectional view of the valve seat member of FIG. 8. [Figure 10] 9 shows a cross-sectional view of the valve seat ring portion of FIG. 8. [Figure 11] 1 shows a third cross-sectional view of an electronic expansion valve provided by an embodiment of the present application. [Figure 12] 12 shows a cross-sectional view of the valve seat member, large gasket, reinforcing seal ring and large positioning structure of FIG. 11. [Figure 13] 13 shows an exploded view of FIG. 12. [Figure 14] FIG. 5 shows a fifth cross-sectional view of an electronic expansion valve provided by an embodiment of the present application. [Figure 15] 15 is a cross-sectional view of a portion of the structure of the electronic expansion valve of FIG. 14. DETAILED DESCRIPTION OF THE INVENTION

[0022] The technical solutions of the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application, but it is clear that the described embodiments are only a part of the embodiments of the present application, and are not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way limits the present application and its application or use. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present application.

[0023] 1 to 3, an embodiment of the present application provides an electronic expansion valve including: a valve seat member 10; a large gasket 20, which is disposed in the cavity of the valve seat member 10, has a large valve port 21, and is made of a soft material; and a valve needle member 30, which is disposed in the cavity of the valve seat member 10, and includes a small valve needle 31, a large valve needle portion 32, and a small gasket 33, which is disposed in the large valve needle portion 32, has a small valve port 331, and is made of a soft material. In this embodiment, the large valve needle portion 32 is used to open and close the large valve port 21 in cooperation with the large gasket 20, and the small valve needle 31 is used to adjust the opening degree of the small valve port 331 in cooperation with the small gasket 33.

[0024] According to this solution, both the large gasket 20 and the small gasket 33 are made of a soft material, achieving a soft seal with both the large valve port 21 and the small valve port 331. This soft sealing method increases the effective contact area during sealing, effectively resolving the poor sealing performance of electronic expansion valves and preventing leakage. A small valve needle 31 is provided, which cooperates with the small gasket 33 to adjust the opening of the small valve port 331 to achieve small flow rates. A large valve needle 32 is provided, which cooperates with the large gasket 20 to open and close the large valve port 21 to achieve large flow rates. The soft material may be plastic or rubber, preferably PEEK or PTFE. This electronic expansion valve can be mounted on a mounting base or installed within the valve body.

[0025] The small valve orifice 331 is configured in a tapered shape, with the small opening end of the small valve orifice 331 facing the large valve orifice 21. By providing the small valve orifice 331 in a tapered shape and facing the large opening end of the small valve orifice 331 toward the large valve orifice 21, the cooperation of the small valve needle 31 and the small valve orifice 331 allows for more accurate flow rate adjustment and meets usage requirements.

[0026] Specifically, the end face of the large valve port 21 is a flat sealing surface 211, and when one end of the large valve needle 32 abuts against this flat sealing surface, the large valve port 21 is closed. By forming the end face of the large valve port 21 as a flat sealing surface 211, when the large valve port 21 is in the closed state, one end of the large valve needle 32 abuts against the flat sealing surface 211, which makes sealing more reliable than with a sloped sealing method. Furthermore, this ensures the maximum flow path area and improves the flow rate of the electronic expansion valve.

[0027] In this embodiment, the small gasket 33 is made of plastic or rubber, and the large gasket 20 is made of plastic or rubber. Using both the small gasket 33 and the large gasket 20 as plastic or rubber provides good sealing performance, excellent wear resistance, and low costs.

[0028] Specifically, the large valve needle portion 32 is provided with a guide hole 321, which is located on the opposite side of the small valve port 331 from the large valve port 21. The small valve needle 31 passes through the guide hole 321 and is axially movable. The valve needle member 30 further includes a first inner seal ring 37, which is located between the outer wall of the small valve needle 31 and the inner wall of the guide hole 321. The guide hole 321 serves to guide the small valve needle 31 during axial movement. The first inner seal ring 37 is located between the outer wall of the small valve needle 31 and the inner wall of the guide hole 321, ensuring a seal between the outer wall of the small valve needle 31 and the inner wall of the guide hole 321 and preventing fluid leakage.

[0029] Optionally, a seal groove is provided on the inner wall of the guide hole 321, and a first inner seal ring 37 is provided in the seal groove.

[0030] In this embodiment, the large valve needle portion 32 is axially movably disposed within the cavity of the valve seat member 10, and the valve needle member 30 further includes a second inner seal ring 38, which is disposed between the inner wall of the valve seat member 10 and the outer wall of the large valve needle portion 32. By disposing the second inner seal ring 38 between the inner wall of the valve seat member 10 and the outer wall of the large valve needle portion 32, a seal between the inner wall of the valve seat member 10 and the outer wall of the large valve needle portion 32 can be ensured, and fluid leakage can be prevented.

[0031] Optionally, a seal groove is provided in the outer wall of the large valve needle portion 32, and a second inner seal ring 38 is provided in the seal groove.

[0032] 1 , the valve needle member 30 further includes a drive assembly 34, which includes a screw 341 and a connecting sleeve 342, one end of the connecting sleeve 342 connected to the valvelet needle 31, the screw 341 and the connecting sleeve 342 being axially restrictively connected, and the screw 341 being arranged to be axially movable so as to drive the movement of the valvelet needle 31. With the above-mentioned configuration, the screw 341 and the connecting sleeve 342 are axially restrictively connected and one end of the connecting sleeve 342 is connected to the valvelet needle 31, so that when the screw 341 moves axially, it drives the connecting sleeve 342 to move axially, and the connecting sleeve 342 can drive the valvelet needle 31 to move axially.

[0033] The drive assembly 34 further includes a rolling structure 343 provided within the connecting sleeve 342, and the connecting sleeve 342 and the screw 341 are each connected to the rolling structure 343 so that the connecting sleeve 342 does not rotate together with the screw 341. By providing the rolling structure 343 and connecting the connecting sleeve 342 and the screw 341 to the rolling structure 343, when the screw 341 rotates, the connecting sleeve 342 is prevented from rotating together with the screw 341 due to the presence of the rolling structure 343. This prevents the small valve needle 31 from rotating relative to the small gasket 33, which would cause wear on the small gasket 33, and improves the durability of the small gasket 33.

[0034] Furthermore, the end of the valvelet needle 31 remote from the valvelet port 331 is inserted into a connecting sleeve 342 and fixedly connected to the connecting sleeve 342, the rolling structure 343 is a bearing, and the drive assembly 34 further includes a bushing 344 and an elastic element 345 provided in the connecting sleeve 342, the bearing being fitted onto one end of the screw 341, one side of the bearing being axially restrictively connected to the connecting sleeve 342, and the other side of the bearing, the bushing 344 and the elastic element 345 successively abutting against the valvelet needle 31. One end of the valvelet needle 31 is inserted into the connecting sleeve 342 and fixedly connected to the connecting sleeve 342 by welding, which is reliable and stable. If the rolling structure is a bearing, not only will the rotational accuracy and bearing capacity be high, but by fitting the bearing into one end of the screw 341 and restricting one side of the bearing to the connecting sleeve 342 in the axial direction, the position of the bearing can be restricted, and it is possible to prevent the connecting sleeve 342 from rotating when the screw 341 rotates, and further to prevent the valve needle 31 from rotating. The other side of the bearing, the bushing 344, and the elastic element 345 are successively in contact with the small valve needle 31. The bushing 344 prevents the elastic element 345 from directly contacting the bearing and also serves as a guide. The elastic element 345 is compressed when the electronic expansion valve is closed. When the screw 341 moves away from the small valve port 331, i.e., when the flow rate is adjusted, the elastic force of the elastic element 345 is released, driving the bushing 344 to move away from the small valve port 331. This allows for precise control of the opening of the small valve port 331 and improves the control accuracy of small flow rate adjustment. The elastic element 345 may be a spring.

[0035] Specifically, the valve needle member 30 is provided with a first locking surface 35 and a second locking surface 36 that face each other and limit the range of movement of the valve needle 31. The screw 341 can drive the individual movement of the valve needle 31 within a preset stroke, and the screw 341 can drive the movement of the large valve needle portion 32 via the valve needle 31. The first locking surface 35 serves to restrict the position of the valve needle 31 when it moves toward the valve orifice 331, and the second locking surface 36 serves to restrict the position of the valve needle 31 when it moves away from the valve orifice 331, thereby limiting the range of movement of the valve needle 31. In this embodiment, when the screw 341 moves axially, the small valve needle 31 is driven to move axially, thereby adjusting the opening of the small valve port 331, thereby achieving a small flow rate adjustment, and when the screw 341 drives the small valve needle 31 to move and the small valve port 331 is completely retracted, the small valve needle 31 drives the large valve needle portion 32 to move, thereby adjusting the opening of the large valve port 21, thereby achieving a large flow rate.

[0036] In this embodiment, the electronic expansion valve further includes a reinforcing sealing ring 40, which is disposed between the large gasket 20 and the inner wall of the valve seat member 10. By disposing the reinforcing sealing ring 40 between the large gasket 20 and the inner wall of the valve seat member 10, a seal between the large gasket 20 and the inner wall of the valve seat member 10 is ensured, preventing fluid leakage. Even if the large gasket 20 is deformed after long-term use, the provision of the reinforcing sealing ring 40 ensures that the sealing effect can still be maintained.

[0037] Specifically, the electronic expansion valve further includes a large position restriction structure 50 provided in the cavity of the valve seat member 10, and the large position restriction structure 50 abuts against the side of the large gasket 20 facing the large valve needle portion 32 so as to press against the large gasket 20. By providing the large position restriction structure 50 for pressing against the large gasket 20, it is ensured that the large gasket 20 does not fall off.

[0038] Optionally, the large gasket 20 has an annular groove at its end facing the large valve needle 32, which engages with the large positioning structure 50. The large gasket 20 has a recess groove at its end away from the large valve needle 32, in which a reinforcing seal ring 40 is disposed. The large gasket 20 has a central hole that defines the large valve port 21. Because the large gasket 20 is prone to deformation after long-term use, leakage may occur between the large gasket 20 and the inner wall of the valve seat member 10 after assembly. However, this solution, by disposing the reinforcing seal ring 40 between the large gasket 20 and the inner wall of the valve seat member 10, the sealing effect of the large valve port 21 is further improved, effectively preventing fluid leakage and simultaneously improving the durability of the electronic expansion valve.

[0039] Optionally, the large position restriction structure 50 includes a pressure ring and a connecting ring connected to each other, the pressure ring abutting against the large gasket 20, the connecting ring being located on the opposite side of the pressure ring from the large gasket 20, and the connecting ring being welded to the inner wall of the valve seat member 10. Providing the pressure ring makes it easy to abut against and press the large gasket 20, and providing the connecting ring on the opposite side of the pressure ring from the large gasket 20 makes it easy to weld the large gasket 20 to the inner wall of the valve seat member 10, reliably preventing the large gasket 20 from falling off and separating it from the large gasket 20 and the reinforcing seal ring 40, preventing the large gasket 20 and the reinforcing seal ring 40 from being deformed by excessive heat caused by welding.

[0040] Optionally, in this embodiment, the large position regulating structure 50 has a chamfered or rounded corner on the outer peripheral side wall of the end facing the large gasket 20. By providing a chamfered or rounded corner on the outer peripheral side wall of the end facing the large gasket 20 of the large position regulating structure 50, it can serve as a guide when installing the large position regulating structure 50, making installation easier.

[0041] In this embodiment, the electronic expansion valve further includes a small positioning structure 60 disposed within the large valve needle portion 32, which abuts against the side of the small gasket 33 opposite the small valve needle 31. The provision of the small positioning structure 60 for pressing the small gasket 33 reliably prevents the small gasket 33 from falling off. According to this solution, the small gasket 33 is disposed within the cavity of the large valve needle portion 32, and the small positioning structure 60 and the side of the small gasket 33 opposite the small valve needle 31 are engaged to restrict their position. This allows the small positioning structure 60 to press against the small gasket 33, effectively preventing the small gasket 33 from deforming due to prolonged use, leading to the small gasket 33 falling off and a loss of sealing effect at the small valve port 331. This electronic expansion valve can be mounted on a mounting base or within a valve body.

[0042] A position restriction groove 322 is provided in the large valve needle portion 32, and the opening of the position restriction groove 322 faces the small position restriction structure 60. The thickness of the small gasket 33 is greater than the depth of the position restriction groove 322, and the small position restriction structure 60 abuts against the side of the small gasket 33 that protrudes from the position restriction groove 322. The provision of the position restriction groove 322 makes it easier to attach the small gasket 33, and by setting the thickness of the small gasket 33 greater than the depth of the position restriction groove 322, the small position restriction structure 60 can be abutted against one side of the small gasket 33, ensuring the sealing effect of the small gasket 33.

[0043] Optionally, the large valve needle portion 32 is further provided with a second position control groove, the radial dimension of which is larger than that of the position control groove 322, the position control groove 322 and the second position control groove forming a step structure, the small position control structure 60 has a ring structure, the outer wall of the small position control structure 60 is welded to the inner wall of the second position control groove, the small position control structure 60 is arranged coaxially with the small valve opening 331, and the inner diameter of the small position control structure 60 is equal to or larger than the minimum radial dimension of the small valve opening 331.

[0044] Optionally, in this embodiment, the electronic expansion valve further includes a valve sleeve, and the valve seat member 10 includes a valve seat ring portion and a base, with the valve sleeve, the valve seat ring portion, and the base being sequentially connected. The electronic expansion valve further includes a nut structure, which is located within the valve sleeve, and the area between the nut structure and the inner wall of the valve sleeve forms a rotor cavity. The electronic expansion valve is provided with a balance groove connecting the rotor cavity, the small valve port, and the large valve port. This achieves pressure balance between the rotor cavity and the small valve port and the large valve port, i.e., pressure balance between the upper and lower sides of the small valve needle 31 and the large valve needle portion 32, thereby improving the switching performance and reliability of the electronic expansion valve.

[0045] In this embodiment, the balance groove includes a first groove, a second groove, a third groove and a fourth groove which are sequentially connected, with the first groove located in the nut structure, the second groove located in the valve seat ring portion, the third groove located on the side wall of the connecting sleeve and the fourth groove located in the small valve needle 31, thereby realizing communication between the rotor cavity and the small valve port and the large valve port through the balance groove, preventing a large pressure difference from occurring between the rotor cavity and the small valve port and avoiding the problem of poor valve shut-off caused by a large pressure difference between the ends of the small valve needle and the large valve needle portion.

[0046] As shown in Figures 4 to 7, the valve needle member 30 includes a first pressing means 70 that is provided in the cavity of the large valve needle portion 32 and is constrainedly connected to the first inner seal ring 37 so as to press against the first inner seal ring 37, and a second pressing means 80 that is fixedly connected to the large valve needle portion 32 and abuts against the side of the first pressing means 70 opposite the first inner seal ring 37.

[0047] According to this solution, the first pressing means 70 is set in a restrictive connection to the first inner seal ring 37 so as to press against the first inner seal ring 37, thereby realizing positional control of the first inner seal ring 37. In addition, the second pressing means 80 is set in abutment against the side of the first pressing means 70 opposite the first inner seal ring 37 so as to press against the first pressing means 70, and at the same time, the second pressing means 80 is fixedly connected to the large valve needle portion 32, which is a stable and reliable connection method. In this solution, the first pressing means 70 is pressed by the second pressing means 80, and the second pressing means 80 is fixedly connected to the large valve needle portion 32, and then the first pressing means 70 presses the first inner seal ring 37. This further prevents the first inner seal ring 37 from falling off, effectively solving the problem that the first pressing means 70 becomes loose after long-term use and the first inner seal ring 37 becomes prone to falling off, and at the same time improving the durability of the valve needle member.

[0048] Specifically, because the second pressing means 80 is welded to the end face of the large valve needle portion 32, the connection is secure and the second pressing means 80 and the first pressing means 70 will not loosen. Furthermore, because the second pressing means 80 is located relatively far from the first inner seal ring 37, the first inner seal ring 37 will not be deformed by the welding heat.

[0049] The inner wall of the large valve needle 32 is provided with a first annular step 11 and a second annular step 12, each of which is stepped. The first inner seal ring 37 is provided in the first annular step 11, the first pressing means 70 is provided in the second annular step 12, and a portion of the second pressing means 80 is inserted into the second annular step 12. The first annular step 11 facilitates the placement of the first inner seal ring 37 and also serves to restrict its position in the circumferential direction. The second annular step 12 facilitates the placement of the first pressing means 70 for pressing against the first inner seal ring 37. A portion of the second pressing means 80 is inserted into the second annular step 12 and is used to abut against the first pressing means 70 so as to press the first pressing means 70.

[0050] Specifically, the second pressing means 80 includes a first cylindrical portion 41, a transition portion 42 and a second cylindrical portion 43 connected in sequence, the outer diameter of the first cylindrical portion 41 is larger than the outer diameter of the second cylindrical portion 43, a portion of the second cylindrical portion 43 is inserted into the cavity of the large valve needle portion 32, the second cylindrical portion 43 abuts against the first pressing means 70, and the outer wall of the second cylindrical portion 43 is welded to the end face of the large valve needle portion 32. At least a portion of the second cylindrical portion 43 is inserted into the cavity of the large valve needle portion 32, and the second cylindrical portion 43 is abutted against the first pressing means 70, thereby reliably pressing the first inner seal ring 37 by the first pressing means 70 and welding the outer wall of the second cylindrical portion 43 to the point where it contacts the end face of the large valve needle portion 32. This reliably prevents the first inner seal ring 37 from being deformed by the heat generated during welding and affecting the sealing effect of the first inner seal ring 37.

[0051] Optionally, the end of the second cylindrical portion 43 facing the first pressing means 70 is provided with a chamfered or rounded corner, which makes it easier to insert the second cylindrical portion 43 into the cavity of the large valve needle portion 32.

[0052] In this embodiment, the first pressing means 70 is an annular plate, and the inner diameter of the first pressing means 70 is larger than the inner diameter of the first inner seal ring 37. By making the first pressing means 70 an annular plate and matching it to the shape of the second annular step portion 12, installation is easy, and the inner diameter of the first pressing means 70 is set to be larger than the inner diameter of the first inner seal ring 37, so that it does not affect connecting elements such as a valve needle inserted into the first inner seal ring 37.

[0053] The first inner seal ring 37 is located between the guide hole 321 and the first pressing means 70, and the guide hole 321, the first inner seal ring 37 and the annular plate are arranged coaxially, and the diameter of the guide hole 321 is equal to the inner diameter of the annular plate. The guide hole 321, the first inner seal ring 37 and the annular plate are arranged coaxially, which makes it easy to assemble the valve needle and seal it against the valve needle.

[0054] Specifically, a seal groove 44 is provided on the outer wall of the second pressing means 80, and the valve needle further includes a second inner seal ring 38, which is provided in the seal groove 44. The provision of the seal groove 44 makes it easier to arrange the second inner seal ring 38, and the provision of the second inner seal ring 38 improves the sealing effect of the valve needle.

[0055] The valvelet needle 31 includes a position limiting rod 71 and a blocking rod 72 connected to each other, the radial dimension of the position limiting rod 71 being larger than the radial dimension of the blocking rod 72, the blocking rod 72 passing through the first inner seal ring 37 and connected to the valvelet port 331, the position limiting rod 71 being located within the cavity of the second pressing means 80, the position limiting rod 71 being lockably connected to the first pressing means 70 on one axial side and the second pressing means 80 on the other axial side. The radial dimension of the position limiting rod 71 is set larger than the radial dimension of the blocking rod 72, the position limiting rod 71 being lockably connected to the first pressing means 70 on one axial side and the second pressing means 80 on the other axial side, thereby serving to limit the position of the valve needle 31 during movement and limiting the range of movement of the valvelet needle 31. This also allows the small valve needle 31 to drive the movement of the large valve needle portion 32 when the large valve needle portion 32 is movable.

[0056] As shown in Figures 8 to 10, the valve seat member 10 includes a base 17 having a first flow path hole 13 in its side wall and a second flow path hole 14 in its bottom wall, and a valve seat ring portion 90 welded to one end of the base 17, having an annular withdrawal groove 91 on the outer peripheral surface of the joint with the base 17, and the welding position with the base 17 located within the annular withdrawal groove 91.

[0057]

[0023] According to this solution, the prior art solution of providing the first passage hole 13 in the seat ring part 90 is abandoned, and the first passage hole 13 is provided in the side wall of the base 17, thereby further reducing the difficulty of processing the seat ring part 90 and reducing manufacturing costs. In addition, an annular recession groove 91 is provided on the outer peripheral surface of the connection part between the seat ring part 90 and the base 17, and the welding position between the seat ring part 90 and the base 17 is located within the annular recession groove 91. As a result, the weld surface formed after welding the valve seat ring part 90 and the base 17 is located within the annular recession groove 91, preventing the weld surface formed after welding from affecting the assembly of the electronic expansion valve. This electronic expansion valve can be mounted on a mounting base or within a valve body.

[0058] Specifically, there are a plurality of first flow path holes 13 , and the plurality of first flow path holes 13 are distributed in the circumferential direction of the base 17 .

[0059] A third annular step portion 15 is provided on the outer peripheral surface of the base 17, and a fourth annular step portion 92 is provided on the outer peripheral surface of the valve seat ring portion 90, with the third annular step portion 15 and the fourth annular step portion 92 forming an annular recession groove 91. By providing the third annular step portion 15 and the fourth annular step portion 92, the annular recession groove 91 is formed when the base 17 and the valve seat ring portion 90 are assembled, and by providing the annular recession groove 91, any irregular weld surface formed after welding the valve seat ring portion 90 and the base 17 is positioned within the annular recession groove 91, thereby preventing the weld surface formed after welding from affecting the assembly of the electronic expansion valve.

[0060] Specifically, the seat ring part 90 is provided with a fifth annular step part 22, and a part of the seat ring part 90 is inserted into the cavity of the base 17, with the end face and the inner wall of the base 17 both being constrained and connected to the fifth annular step part 22. The fifth annular step part 22 serves as a restriction when the seat ring part 90 is inserted into the cavity of the base 17, thereby limiting the insertion depth of the seat ring part 90.

[0061] In this embodiment, the outer wall of the base 17 is provided with a first accommodating groove 16 for mounting a seal ring, the outer wall of the valve seat ring portion 90 is provided with a second accommodating groove 93 for mounting a seal ring, and the first passage hole 13 is located between the first accommodating groove 16 and the second accommodating groove 93. The provision of the first accommodating groove 16 on the outer wall of the base 17 facilitates the placement of the seal ring and improves the sealing effect of the electronic expansion valve, the provision of the second accommodating groove 93 on the outer wall of the valve seat ring portion 90 facilitates the placement of the seal ring and further improves the sealing effect of the electronic expansion valve, and the provision of the first passage hole 13 between the first accommodating groove 16 and the second accommodating groove 93 enables the seal ring to effectively prevent fluid leakage.

[0062] Specifically, the outer wall of the valve seat ring portion 90 is provided with a male thread portion for connection to an external structure, and / or the valve seat ring portion 90 is provided with an operation hole 24 that is aligned with an installation tool. By providing a male thread portion on the outer wall of the valve seat ring portion 90, detachable connection to an external structure is facilitated, improving the versatility of the electronic expansion valve. An installation tool can be inserted into the operation hole 24 to tighten or loosen the electronic expansion valve.

[0063] 8, the electronic expansion valve further includes a valve sleeve 100, and the end of the valve seat ring part 90 remote from the base 17 is inserted into the valve sleeve 100 and welded to the valve sleeve 100. By inserting the end of the valve seat ring part 90 remote from the base 17 into the valve sleeve 100 and welding it to the valve sleeve 100, it is possible to prevent external factors from affecting the internal structure of the electronic expansion valve. The use of a welding connection method is stable and reliable.

[0064] Specifically, the valve seat ring portion 90 includes a first cylindrical portion 94, a second cylindrical portion 95, a third cylindrical portion 96, a connecting portion 97, and a guide portion 98 connected in sequence, the outer diameter of the second cylindrical portion 95 is larger than the outer diameters of the first cylindrical portion 94, the third cylindrical portion 96, and the connecting portion 97, the outer diameter of the connecting portion 97 is larger than the outer diameter of the guide portion 98, the guide portion 98 is inserted into the base 17, the connecting portion 97 is welded to the base 17, a second accommodating groove 93 for attaching a seal ring to the outer wall of the third cylindrical portion 96 is provided, and a male thread portion is provided on the outer wall of the second cylindrical portion 95. The above-described installation method employs the connecting portion 97, which facilitates welding to the base 17; the guide portion 98, which is inserted into the base 17, serves as a guide for the valve seat ring portion 90 during assembly; the second receiving groove 93 on the outer wall of the third cylindrical portion 96 facilitates gasket placement and improves sealing; and the external thread on the outer wall of the second cylindrical portion 95 facilitates detachable connection to external structures, improving the versatility of the electronic expansion valve. Optionally, the outer diameter of the third cylindrical portion 96 is equal to the outer diameter of the base 17.

[0065] 11 to 13, a sixth annular step portion 23 is provided on the outside of the large gasket 20, and the reinforcing seal ring 40 is disposed within the sixth annular step portion 23, with the reinforcing seal ring 40 abutting against both the inner surface and the bottom surface of the cavity of the valve seat member 10. The provision of the sixth annular step portion 23 makes it easy to position the reinforcing seal ring 40, and the reinforcing seal ring 40 abuts against both the inner surface and the bottom surface of the cavity of the valve seat member 10. This configuration reliably ensures the sealing effect of the large gasket 20 and prevents deformation of the large gasket 20 and fluid leakage from the valve seat member 10 after long-term use.

[0066] The large position restriction structure 50 includes a pressure ring 51 and a connecting ring 52 connected to each other, the pressure ring 51 abutting against the large gasket 20, the connecting ring 52 being located on the opposite side of the pressure ring 51 from the large gasket 20, and the connecting ring 52 being welded to the inner wall of the valve seat member 10. The provision of the pressure ring 51 makes it easy to abut against and press the large gasket 20, and the provision of the connecting ring 52 on the opposite side of the pressure ring 51 from the large gasket 20 makes it easy to weld the large gasket 20 to the inner wall of the valve seat member 10, preventing the large gasket 20 from falling off while at the same time separating it from the large gasket 20 and the reinforcing seal ring 40, and preventing the large gasket 20 and the reinforcing seal ring 40 from being deformed by heat due to excessive welding heat.

[0067] Specifically, a seventh annular step portion 25 is provided on the outside of the large gasket 20, and the large position regulating structure 50 is restrictively connected to the seventh annular step portion 25. By providing the seventh annular step portion 25, restrictive connection with the large position regulating structure 50 to limit the range of movement of the large position regulating structure 50 becomes easier, and the pressure ring 51 is restrictively connected to the seventh annular step portion 25.

[0068] In this embodiment, the reinforcing seal ring 40 is made of a soft material, which can improve the sealing effect of the reinforcing seal ring 40. The material of the reinforcing seal ring 40 is plastic or rubber.

[0069] The large valve needle 32 has a hollow structure, and is provided at its end with a sealing surface 411 for sealingly connecting with the large gasket 20, the sealing surface 411 being an arc-shaped surface. By providing the sealing surface 411 at the end of the large valve needle 32 for sealingly connecting with the large gasket 20, the contact area is increased, facilitating sealing with the large gasket 20 and achieving a maximum flow area, thereby increasing the flow rate of the electronic expansion valve.

[0070] 14 and 15, the large valve needle portion 32 is provided with an arrangement groove 212 that communicates with the position restriction groove 322, the radial dimension of the arrangement groove 212 being larger than the radial dimension of the position restriction groove 322, and the small position restriction structure 60 is positioned within the arrangement groove 212. The provision of the arrangement groove 212 makes it easy to arrange the small position restriction structure 60, and because the radial dimension of the arrangement groove 212 is set larger than the radial dimension of the position restriction groove 322, it is convenient during assembly to arrange the small gasket 33 within the position restriction groove 322 and then arrange the small position restriction structure 60 to press the small gasket 33.

[0071] The small position control structure 60 has an annular structure, and the outer wall of the small position control structure 60 is welded to the inner wall of the arrangement groove 212. The small position control structure 60 is arranged coaxially with the small valve orifice 331, and the inner diameter of the small position control structure 60 is equal to or greater than the smallest radial dimension of the small valve orifice 331. The annular structure of the small position control structure 60 allows it to fit the shape of the arrangement groove 212, facilitating assembly. Welding the outer wall of the small position control structure 60 to the inner wall of the arrangement groove 212 more reliably prevents the small gasket 33 from falling off, and the welding connection method is stable and reliable. The small position control structure 60 is arranged coaxially with the small valve orifice 331, and the inner diameter of the small position control structure 60 is set to be equal to or greater than the smallest radial dimension of the small valve orifice 331, facilitating assembly of the valve needle 31 and sealing of the small valve orifice 331.

[0072] Specifically, the large opening end of the small valve orifice 331 is spaced apart from the small position restriction structure 60. By making the large opening end of the small valve orifice 331 spaced apart from the small position restriction structure 60, the small valve needle 31 and the small valve orifice 331 work together to more accurately adjust the flow rate and meet usage requirements.

[0073] Specifically, the large valve needle portion 32 is provided with a side opening 213, which is located on the opposite side of the small gasket 33 from the small position restricting structure 60. When the small valve port 331 is in an open state, the small valve port 331 communicates with the first flow passage hole 13 via the side opening 213. With the above-described setting method, when the large valve needle portion 32 is provided with the side opening 213 and the small valve port 331 is in an open state, fluid flows into the first flow passage hole 13 through the side opening 213, thereby achieving a small flow rate on / off function. Furthermore, because the side opening 213 is located on the opposite side of the small gasket 33 from the small position restricting structure 60, interference between the side opening 213 and the small position restricting structure 60 can be avoided, allowing the structure of the valve needle element 30 to be made compact.

[0074] The above is only a preferred embodiment of the present application, and is not intended to limit the present application, and various modifications and variations are possible for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0075] The accompanying drawings include the following reference numerals: [Explanation of symbols]

[0076] 10 Valve seat member 13 First flow path hole 14 Second flow path hole 15 Third annular step 16 First storage groove 17 Base 20 Large gasket 21 Large valve 211 Sealing plane 23 6th annular step 25 7th annular step 30 Valve needle member 31 Valvelet Needle 71 Position control rod 72 Blocking Rod 32 Large valve needle 321 Guide hole 322 Position control groove 11 First annular step 12 Second annular step 411 sealing surface 212 Placement groove 213 Side opening 33 Small gasket 331 Small valve 34 Drive Assembly 341 Screw 342 Connecting sleeve 343 Rolling Structure 344 Bush 345 Elastic Elements 35 First locking surface 36 Second locking surface 37 No. 1 inner seal ring 38 Second inner seal ring 40 Reinforced seal ring 50 Large position regulation structure 51 Pressure ring 52 Connection Ring 60 Small position regulation structure 70 First pressing means 80 Second pressing means 41 First cylindrical part 42 Transition 43 Second cylindrical section 44 Seal groove 90 Valve seat ring 91 Circular evacuation groove 92 Fourth annular step 93 Second storage trench 22 5th annular step 24 Operation hole 94 First cylinder part 95 Second cylinder part 96 Third cylinder part 97 Connection 98 Guide part 100 Valve Sleeve

Claims

1. a valve seat member (10); a large gasket (20) provided in the cavity of the valve seat member (10), having a large valve port (21), and made of a soft material; an electronic expansion valve including: a valve needle member (30) disposed in a cavity of the valve seat member (10), the valve needle member (30) including a small valve needle (31), a large valve needle portion (32) and a small gasket (33), the small gasket (33) being disposed in the large valve needle portion (32) and having a small valve port (331), the needle member (30) being made of a soft material; wherein the large valve needle portion (32) is used to open and close the large valve port (21) in cooperation with the large gasket (20), and the small valve needle (31) is used to adjust the opening degree of the small valve port (331) in cooperation with the small gasket (33); the large valve needle portion (32) is provided with a guide hole (321), the guide hole (321) is located on the opposite side of the small valve port (331) from the large valve port (21), the small valve needle (31) is inserted through the guide hole (321) and is axially movable, and the valve needle member (30) further includes a first inner seal ring (37), the first inner seal ring (37) is located between the outer wall of the small valve needle (31) and the inner wall of the guide hole (321).

2. 2. The electronic expansion valve according to claim 1, wherein the small valve port (331) is configured in a tapered shape, and a small opening end of the small valve port (331) faces the large valve port (21).

3. 2. The electronic expansion valve according to claim 1, wherein an end face of the large valve port (21) is a sealing flat surface (211), and when one end of the large valve needle portion (32) abuts against the sealing flat surface (211), the large valve port (21) is closed.

4. 2. The electronic expansion valve according to claim 1, wherein the small gasket (33) is made of plastic or rubber, and the large gasket (20) is made of plastic or rubber.

5. 2. The electronic expansion valve according to claim 1, wherein the large valve needle portion (32) is axially movably disposed within the cavity of the valve seat member (10), and the valve needle member (30) further includes a second inner seal ring (38), the second inner seal ring (38) being disposed between an inner wall of the valve seat member (10) and an outer wall of the large valve needle portion (32).

6. 2. The electronic expansion valve of claim 1, wherein the valve needle member (30) further includes a drive assembly (34), the drive assembly (34) including a screw (341) and a connecting sleeve (342), one end of the connecting sleeve (342) connected to the valvelet needle (31), the screw (341) and the connecting sleeve (342) being axially constrainedly connected, and the screw (341) being axially movable so as to drive the movement of the valvelet needle (31).

7. 7. The electronic expansion valve of claim 6, wherein the drive assembly (34) further includes a rolling structure (343) provided in the connecting sleeve (342), and the connecting sleeve (342) and the screw (341) are each coupled to the rolling structure (343) so that the connecting sleeve (342) does not rotate together with the screw (341).

8. 8. The electronic expansion valve according to claim 7, wherein an end of the valvelet needle (31) remote from the valvelet port (331) is inserted into the connecting sleeve (342) and fixedly connected to the connecting sleeve (342), the rolling structure (343) is a bearing, the drive assembly (34) further includes a bushing (344) and an elastic element (345) provided in the connecting sleeve (342), the bearing is fitted to one end of the screw (341), one side of the bearing is axially restrictively connected to the connecting sleeve (342), and the other side of the bearing, the bushing (344), and the elastic element (345) abut against the valvelet needle (31) successively.

9. 7. The electronic expansion valve according to claim 6, wherein the valve needle member (30) has opposing first and second locking surfaces (35) and (36), which limit the range of movement of the small valve needle (31), and the screw (341) is capable of driving the small valve needle (31) to move independently within a preset stroke, and the screw (341) is also capable of driving the large valve needle portion (32) to move via the small valve needle (31).

10. 2. The electronic expansion valve according to claim 1, further comprising a reinforcing seal ring (40), the reinforcing seal ring (40) being disposed between the large gasket (20) and an inner wall of the valve seat member (10).

11. 2. The electronic expansion valve according to claim 1, further comprising a large position regulating structure (50) provided in the cavity of the valve seat member (10), the large position regulating structure (50) abutting against a side of the large gasket (20) facing the large valve needle portion (32) so as to press the large gasket (20).

12. 2. The electronic expansion valve according to claim 1, further comprising a small position regulating structure (60) provided in the large valve needle portion (32), the small position regulating structure (60) abutting against the side of the small gasket (33) opposite the small valve needle (31).

13. 13. The electronic expansion valve according to claim 12, wherein the large valve needle portion (32) is provided with a position restriction groove (322), the opening of the position restriction groove (322) faces the small position restriction structure (60), the thickness of the small gasket (33) is greater than the depth of the position restriction groove (322), and the small position restriction structure (60) abuts against the side of the small gasket (33) protruding from the position restriction groove (322).

14. The valve needle member (30) a first pressing means (70) provided in a cavity of the large valve needle portion (32) and constrainedly connected to the first inner seal ring (37) so as to press against the first inner seal ring (37); and a second pressing means (80) fixedly connected to the large valve needle portion (32) and abutting the first pressing means (70) on a side opposite the first inner seal ring (37).

15. 15. The electronic expansion valve according to claim 14, wherein an inner wall of the large valve needle portion (32) is provided with a first annular step portion (11) and a second annular step portion (12) formed in a stepped shape, the first inner seal ring (37) is provided in the first annular step portion (11), the first pressing means (70) is provided in the second annular step portion (12), and a portion of the second pressing means (80) is inserted into the second annular step portion (12).

16. 15. The electronic expansion valve according to claim 14, wherein the second pressing means (80) includes a first cylindrical portion (41), a transition portion (42), and a second cylindrical portion (43) connected in series, the outer diameter of the first cylindrical portion (41) being larger than the outer diameter of the second cylindrical portion (43), at least a portion of the second cylindrical portion (43) being inserted into a cavity of the large valve needle portion (32), the second cylindrical portion (43) abutting against the first pressing means (70), and an outer wall of the second cylindrical portion (43) being welded to a location where it abuts against an end face of the large valve needle portion (32).

17. 15. The electronic expansion valve of claim 14, wherein the first pressing means is an annular plate, the inner diameter of the first pressing means is larger than the inner diameter of the first inner seal ring, the first inner seal ring is located between the guide hole and the first pressing means, the guide hole, the first inner seal ring and the annular plate are coaxial, the diameter of the guide hole is equal to the inner diameter of the annular plate, the outer wall of the second pressing means is provided with a seal groove, and the valve needle member further includes a second inner seal ring, the second inner seal ring is provided in the seal groove.

18. 15. The electronic expansion valve according to claim 14, wherein the valvelet needle (31) includes a position limiting rod (71) and a blocking rod (72) connected to each other, the radial dimension of the position limiting rod (71) is larger than the radial dimension of the blocking rod (72), the blocking rod (72) is inserted through the first inner seal ring (37) and connected to the valvelet port (331), the position limiting rod (71) is located in a cavity of the second pressing means (80), the position limiting rod (71) is lockingly connected to the first pressing means (70) on one axial side, and the position limiting rod (71) is lockingly connected to the second pressing means (80) on the other axial side.

19. The valve seat member (10) is a base (17) having a first flow path hole (13) in its side wall and a second flow path hole (14) in its bottom wall; 13. The electronic expansion valve according to claim 12, further comprising: a valve seat ring portion (90) welded to one end of the base (17), the valve seat ring portion (90) having an annular recession groove (91) formed on an outer peripheral surface of a connection point with the base (17), and a welding position with the base (17) located within the annular recession groove (91).

20. 20. The electronic expansion valve according to claim 19, wherein the outer peripheral surface of the base is provided with a third annular step portion, the outer peripheral surface of the valve seat ring portion is provided with a fourth annular step portion, the third annular step portion and the fourth annular step portion form the annular recess groove, the valve seat ring portion is provided with a fifth annular step portion, a portion of the valve seat ring portion is inserted into the cavity of the base, and both an end face and an inner wall of the base are constrained and connected to the fifth annular step portion.

21. 20. The electronic expansion valve according to claim 19, wherein a first accommodating groove (16) for mounting a seal ring is provided on an outer wall of the base (17), a second accommodating groove (93) for mounting a seal ring is provided on an outer wall of the valve seat ring portion (90), and the first flow passage hole (13) is located between the first accommodating groove (16) and the second accommodating groove (93).

22. 20. The electronic expansion valve according to claim 19, wherein the outer wall of the valve seat ring portion (90) is provided with a male thread portion for connection to an external structure, and / or the valve seat ring portion (90) is provided with an operating hole (24) adapted to an installation tool, the electronic expansion valve further includes a valve sleeve (100), and an end of the valve seat ring portion (90) remote from the base (17) is inserted into the valve sleeve (100) and welded to the valve sleeve (100).

23. 20. The electronic expansion valve according to claim 19, wherein the valve seat ring portion (90) includes a first cylindrical portion (94), a second cylindrical portion (95), a third cylindrical portion (96), a connecting portion (97), and a guide portion (98) connected in sequence, the outer diameter of the second cylindrical portion (95) is larger than the outer diameters of the first cylindrical portion (94), the third cylindrical portion (96), and the connecting portion (97), the outer diameter of the connecting portion (97) is larger than the outer diameter of the guide portion (98), the guide portion (98) is inserted into the base (17), the connecting portion (97) is welded to the base (17), a second accommodating groove (93) for attaching a seal ring is provided on an outer wall of the third cylindrical portion (96), and a male thread portion is provided on an outer wall of the second cylindrical portion (95).

24. 11. The electronic expansion valve according to claim 10, wherein the large gasket has an outer surface provided with a sixth annular step portion, the reinforcing seal ring is disposed in the sixth annular step portion, and the reinforcing seal ring is in contact with both the inner surface and the bottom surface of the cavity of the valve seat member, or the large gasket has an outer surface provided with an annular groove, the reinforcing seal ring is disposed in the annular groove, and the reinforcing seal ring is in contact with the inner surface of the cavity of the valve seat member.

25. 12. The electronic expansion valve according to claim 11, wherein the large position regulating structure (50) includes a pressure ring (51) and a connecting ring (52) connected to each other, the pressure ring (51) abuts against the large gasket (20), the connecting ring (52) is located on a side of the pressure ring (51) opposite the large gasket (20), the connecting ring (52) is welded to an inner wall of the valve seat member (10), the outer wall of the end of the large position regulating structure (50) facing the large gasket (20) is provided with a chamfered or rounded corner, and a seventh annular step portion (25) is provided on the outside of the large gasket (20), and the large position regulating structure (50) is restrictively connected to the seventh annular step portion (25).

26. 11. The electronic expansion valve according to claim 10, wherein the reinforcing seal ring (40) is made of a soft material and the outer diameter of the reinforcing seal ring (40) is larger than the outer diameter of the large gasket (20).

27. 4. The electronic expansion valve according to claim 3, wherein the large valve needle (32) has a hollow structure, and an end of the large valve needle (32) is provided with a sealing surface (411) for sealingly connecting with the large gasket (20), and the sealing surface (411) is an arc-shaped surface.

28. 14. The electronic expansion valve according to claim 13, wherein the large valve needle portion (32) is provided with an arrangement groove (212) communicating with the position restriction groove (322), the radial dimension of the arrangement groove (212) is larger than the radial dimension of the position restriction groove (322), and the small position restriction structure (60) is located within the arrangement groove (212).

29. 29. The electronic expansion valve according to claim 28, wherein the small position regulating structure (60) has an annular structure, the outer wall of the small position regulating structure (60) is welded to the inner wall of the arrangement groove (212), the small position regulating structure (60) is arranged coaxially with the small valve port (331), and the inner diameter of the small position regulating structure (60) is equal to or greater than the minimum radial dimension of the small valve port (331).

30. 20. The electronic expansion valve according to claim 19, wherein the large opening end of the small valve port (331) is separated from the small position restriction structure (60), the large valve needle portion (32) is provided with a side opening (213), the side opening (213) is located on the side of the small gasket (33) opposite the small position restriction structure (60), and when the small valve port (331) is in an open state, the small valve port (331) communicates with the first flow path hole (13) through the side opening (213).

31. A valve seat member (10), a large gasket (20) provided in the cavity of the valve seat member (10), having a large valve port (21), and made of a soft material; an electronic expansion valve including: a valve needle member (30) disposed in a cavity of the valve seat member (10), the valve needle member (30) including a small valve needle (31), a large valve needle portion (32) and a small gasket (33), the small gasket (33) being disposed in the large valve needle portion (32) and having a small valve port (331), the needle member (30) being made of a soft material; wherein the large valve needle portion (32) is used to open and close the large valve port (21) in cooperation with the large gasket (20), and the small valve needle (31) is used to adjust the opening degree of the small valve port (331) in cooperation with the small gasket (33); the large valve needle portion (32) is axially movably disposed within a cavity of the valve seat member (10), the valve needle member (30) further includes a second inner seal ring (38), the second inner seal ring (38) being disposed between an inner wall of the valve seat member (10) and an outer wall of the large valve needle portion (32).

32. A valve seat member (10), a large gasket (20) provided in the cavity of the valve seat member (10), having a large valve port (21), and made of a soft material; an electronic expansion valve including: a valve needle member (30) disposed in a cavity of the valve seat member (10), the valve needle member (30) including a small valve needle (31), a large valve needle portion (32) and a small gasket (33), the small gasket (33) being disposed in the large valve needle portion (32) and having a small valve port (331), the needle member (30) being made of a soft material; wherein the large valve needle portion (32) is used to open and close the large valve port (21) in cooperation with the large gasket (20), and the small valve needle (31) is used to adjust the opening degree of the small valve port (331) in cooperation with the small gasket (33); the valve needle member (30) further includes a drive assembly (34), the drive assembly (34) including a screw (341) and a connecting sleeve (342), one end of the connecting sleeve (342) connected to the valvelet needle (31), the screw (341) and the connecting sleeve (342) being axially constrainedly connected, and the screw (341) being axially movable to drive movement of the valvelet needle (31); The electronic expansion valve, characterized in that the drive assembly (34) further includes a rolling structure (343) provided in the connecting sleeve (342), and the connecting sleeve (342) and the screw (341) are each connected to the rolling structure (343) so that the connecting sleeve (342) does not rotate together with the screw (341).

33. A valve seat member (10), a large gasket (20) provided in the cavity of the valve seat member (10), having a large valve port (21), and made of a soft material; an electronic expansion valve including: a valve needle member (30) disposed in a cavity of the valve seat member (10), the valve needle member (30) including a small valve needle (31), a large valve needle portion (32) and a small gasket (33), the small gasket (33) being disposed in the large valve needle portion (32) and having a small valve port (331), the needle member (30) being made of a soft material; wherein the large valve needle portion (32) is used to open and close the large valve port (21) in cooperation with the large gasket (20), and the small valve needle (31) is used to adjust the opening degree of the small valve port (331) in cooperation with the small gasket (33); The valve needle member (30) further includes a drive assembly (34), the drive assembly (34) including a screw (341) and a connecting sleeve (342), one end of the connecting sleeve (342) connected to the valvelet needle (31), the screw (341) and the connecting sleeve (342) being axially constrainedly connected, and the screw (341) being axially movable so as to drive the movement of the valvelet needle (31). the valve needle member (30) has opposed first and second locking surfaces (35) and (36), which limit the range of movement of the small valve needle (31); the screw (341) is capable of driving the small valve needle (31) to move independently within a preset stroke; and the screw (341) is also capable of driving the large valve needle portion (32) to move via the small valve needle (31).

34. A valve seat member (10), a large gasket (20) provided in the cavity of the valve seat member (10), having a large valve port (21), and made of a soft material; an electronic expansion valve including: a valve needle member (30) disposed in a cavity of the valve seat member (10), the valve needle member (30) including a small valve needle (31), a large valve needle portion (32) and a small gasket (33), the small gasket (33) being disposed in the large valve needle portion (32) and having a small valve port (331), the needle member (30) being made of a soft material; wherein the large valve needle portion (32) is used to open and close the large valve port (21) in cooperation with the large gasket (20), and the small valve needle (31) is used to adjust the opening degree of the small valve port (331) in cooperation with the small gasket (33); The electronic expansion valve further includes a small position regulating structure (60) provided in the large valve needle portion (32), the small position regulating structure (60) abutting against the small gasket (33) on the side opposite to the small valve needle (31); an opening of the position restriction groove (322) facing the small position restriction structure (60); a thickness of the small gasket (33) being greater than a depth of the position restriction groove (322); and the small position restriction structure (60) abutting against the side of the small gasket (33) protruding from the position restriction groove (322).

35. A valve seat member (10), a large gasket (20) provided in the cavity of the valve seat member (10), having a large valve port (21), and made of a soft material; an electronic expansion valve including: a valve needle member (30) disposed in a cavity of the valve seat member (10), the valve needle member (30) including a small valve needle (31), a large valve needle portion (32) and a small gasket (33), the small gasket (33) being disposed in the large valve needle portion (32) and having a small valve port (331), the needle member (30) being made of a soft material; wherein the large valve needle portion (32) is used to open and close the large valve port (21) in cooperation with the large gasket (20), and the small valve needle (31) is used to adjust the opening degree of the small valve port (331) in cooperation with the small gasket (33); The electronic expansion valve further includes a small position regulating structure (60) provided in the large valve needle portion (32), the small position regulating structure (60) abutting against the small gasket (33) on the side opposite to the small valve needle (31); The valve seat member (10) is a base (17) having a first flow path hole (13) in its side wall and a second flow path hole (14) in its bottom wall; and a valve seat ring portion (90) welded to one end of the base (17), the valve seat ring portion (90) having an annular recession groove (91) formed on the outer peripheral surface of the connection point with the base (17), the position of welding to the base (17) being located within the annular recession groove (91).

Images