Electronic Expansion Valve

Abstract

an electronic expansion valve comprising: a valve seat member having a large valve port; and a spindle member disposed within a chamber of the valve seat member, the spindle member including a large spindle portion, a small spindle and a drive assembly, the large spindle portion having a tapered small valve port, a larger end of the opening of the small valve port being spaced from the large valve port, the drive assembly and the small spindle and the large spindle portion being driven and connected to each other, the electronic expansion valve having a closed state, a flow control state and a fully open state, in which in the closed state, the small spindle is inserted into the small valve port to seal the small valve port and the large spindle portion seals the large valve port, in the flow control state, the large spindle portion seals the large valve port, the small spindle is axially movable to adjust the opening of the small valve port, and in the fully open state, the large spindle portion avoids the large valve port. This electronic expansion valve solves the problem that the electronic expansion valves of the prior art cannot achieve small flow control.

Description

[Technical field]

[0001] This application claims priority to the patent application filed with the State Intellectual Property Office of the People's Republic of China on January 30, 2022, bearing application number 202220249836.5 and titled "Electronic Expansion Valve", priority to the patent application filed with the State Intellectual Property Office of the People's Republic of China on January 30, 2022, bearing application number 202220249818.7 and titled "Electronic Expansion Valve", priority to the patent application filed with the State Intellectual Property Office of the People's Republic of China on January 30, 2022, bearing application number 202220249839.9 and titled "Electronic Expansion Valve", and priority to the patent application filed with the State Intellectual Property Office of the People's Republic of China on January 30, 2022, bearing application number 202220249837.X and titled "Electronic Expansion Valve".

[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 cooling and heating equipment such as air conditioners, refrigerators, and heat pump water heaters generally adopt electronic expansion valves to adjust the flow rate of fluid. An electronic expansion valve generally comprises a valve seat member, a spindle member, and a drive assembly. The valve seat member generally includes a valve seat and a connecting pipe. The valve seat has a valve port. The opening degree of the valve port is adjusted by moving the spindle member to control the flow. The electronic expansion valves in the prior art generally can adjust a large flow rate but cannot adjust a small flow rate. Therefore, it is necessary to design an electronic expansion valve that can adjust not only a small flow rate but also a large flow rate. Summary of the Application

[0004] The present application provides an electronic expansion valve to solve the problem that the electronic expansion valve in the prior art cannot realize small flow rate regulation.

[0005] In order to solve the above problems, the present application provides an electronic expansion valve comprising: a valve seat member having a large valve port; and a spindle member disposed in a chamber of the valve seat member, the spindle member including a large spindle portion, a small spindle and a drive assembly, the large spindle portion having a small valve port, the small valve port having a flow regulating surface, a larger end of the opening of the small valve port being separated from the large valve port, the drive assembly and the small spindle and the large spindle portion are all drivingly connected to the spindle member, the electronic expansion valve having a closed state, a flow regulating state and a fully open state, wherein in the closed state, the small spindle is inserted into the small valve port to seal the small valve port and the large spindle portion seals the large valve port; in the flow regulating state, the large spindle portion seals the large valve port and the small spindle is axially movable to adjust the opening degree of the small valve port; and in the fully open state, the large spindle portion avoids the large valve port.

[0006] Furthermore, the flow rate adjustment surface is a tapered surface, and in the closed state, the small spindle abuts against the small valve port, and / or the end face of the large valve port is a sealing flat surface, and in the closed state, one end of the large spindle portion abuts against the sealing flat surface.

[0007] Furthermore, the large spindle portion has a restricting chamber and a guide hole which are connected to each other, the restricting chamber, the guide hole and the small valve port are arranged in sequence, the small spindle includes a restricting rod and a sealing rod which are connected to each other, the restricting rod is arranged in the restricting chamber so as to be axially movable, the sealing rod passes through the guide hole, and the drive assembly and the restricting rod are drivingly connected.

[0008] Furthermore, in the axial direction of the spindle member, the limiting chamber has opposing first and second stop surfaces, one side of the limiting rod is lockingly engaged with the first stop surface, and the small spindle further includes a stop shoulder provided on a side wall of the limiting rod, the stop shoulder being lockingly engaged with the second stop surface.

[0009] Moreover, the spindle member further includes a first resilient member, both ends of which abut against the first stop surface and the stop shoulder, respectively.

[0010] Furthermore, the outer diameter of the limiting rod is larger than that of the sealing rod, the first elastic member is a spring fitted to the limiting rod, and the stop shoulder is an annular structure.

[0011] Further, the drive assembly includes a screw and a connecting sleeve, one end of the connecting sleeve is connected to the small spindle, the screw and the connecting sleeve are in axial limited engagement, the screw is axially movable, the screw can move the small spindle alone in conjunction with the small spindle within a predetermined stroke, and the screw can move the large spindle portion in conjunction with the small spindle.

[0012] Furthermore, the large spindle portion has an escape hole, the connecting sleeve passes through the escape hole, and one end of the small spindle remote from the small valve port is inserted into the connecting sleeve and fixedly connected to the connecting sleeve.

[0013] The drive assembly further includes a bearing, a bush and a second elastic member provided in the connecting sleeve, the bearing is fitted onto one end of the screw, one side of the bearing and the connecting sleeve are axially limitedly engaged, and the other side of the bearing, the bush, the second elastic member and the small spindle are abutted in order.

[0014] Furthermore, the valve seat member has a flow hole, and the large spindle portion has a side opening which is located on one side of the small valve port away from the large valve port, and in the flow rate control state, the flow hole, the side opening, the small valve port and the large valve port are sequentially connected to each other.

[0015] Further, the valve seat member includes a valve seat body, a large gasket, a first outer sealing ring and a second outer sealing ring, the large gasket is located in the chamber of the valve seat body, the large gasket has a large valve port, the valve seat body has a flow hole, the first outer sealing ring and the second outer sealing ring are fitted to the outer wall of the valve seat body, and the flow hole is located between the first outer sealing ring and the second outer sealing ring.

[0016] When the technical aspects of the present application are applied, there is provided an electronic expansion valve including: a valve seat member having a large valve port; and a spindle member provided in a chamber of the valve seat member, the spindle member including a large spindle portion, a small spindle and a drive assembly, the large spindle portion having a small valve port, the small valve port having a flow regulating surface, a larger end of the opening of the small valve port being separated from the large valve port, the drive assembly and the small spindle and the large spindle portion are all drivingly connected to each other, the electronic expansion valve having a closed state, a flow regulating state and a fully open state, wherein in the closed state, the small spindle is inserted into the small valve port to seal the small valve port and the large spindle portion seals the large valve port; in the flow regulating state, the large spindle portion seals the large valve port and the small spindle is axially movable to adjust the opening degree of the small valve port; and in the fully open state, the large spindle portion avoids the large valve port. When this embodiment is adopted, the small spindle is inserted into the small valve port to seal the small valve port, the large spindle part seals the large valve port, and the drive assembly is arranged to drive and connect the small spindle and the large spindle part, so that the small spindle moves axially to adjust the opening of the small valve port to adjust the small flow rate. The large spindle part seals or avoids the large valve port to allow the large flow rate to be conducted or blocked. Here, when the electronic expansion valve is in a closed state, the small spindle seals the small valve port, and the large spindle part seals the large valve port. When the electronic expansion valve is in a flow rate adjustment state, the drive assembly drives the small spindle to move axially to adjust the opening of the small valve port, and the large spindle part seals the large valve port to adjust the small flow rate. When the electronic expansion valve is in a fully open state, when the drive assembly drives the small spindle to move it until it completely avoids the small valve port, the small spindle moves the large spindle part in an axial direction in conjunction with the small spindle part until the large spindle part completely avoids the large valve port, thereby achieving the fully open state. [Brief description of the drawings]

[0017] 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.

[0018] [Figure 1] 1 shows a cross-sectional view of an electronic expansion valve provided in an embodiment of the present application. [Diagram 2] 2 shows a cross-sectional view of a spindle member in the electronic expansion valve in FIG. 1. [Diagram 3] 2 shows a cross-sectional view of the small spindle and small valve orifice in FIG. 1. [Figure 4] 2 is a cross-sectional view of the large spindle portion and the large gasket in FIG. 1. [Diagram 5] FIG. 2 shows a cross-sectional view of an electronic expansion valve provided in an embodiment of the present application. [Figure 6] 6 shows a cross-sectional view of the small spindle and the small gasket in FIG. 5. [Figure 7] 6 shows a cross-sectional view of the small spindle in FIG. 5. [Figure 8] FIG. 3 shows a cross-sectional view of an electronic expansion valve provided in an embodiment of the present application. [Figure 9] FIG. 9 shows a schematic diagram of the nut structure. [Figure 10] A structural schematic diagram of the valve seat ring in FIG. 8 is shown. [Figure 11] 11 shows a cross-sectional view of the valve seat ring in FIG. 10. [Figure 12] 9 shows a cross-sectional view of the connection sleeve in FIG. 8. [Figure 13] FIG. 9 shows a cross-sectional view of the small spindle in FIG. 8. [Figure 14] FIG. 4 shows a cross-sectional view of an electronic expansion valve provided in an embodiment of the present application. [Figure 15] FIG. 15 is a partially enlarged view of FIG. [Figure 16] A structural schematic diagram of the spindle member in FIG. 14 is shown.

[0019] Here, the above drawings include the following reference numbers: 10 valve seat member, 11 large valve port, 111 sealing surface, 12 first elastic member, 13 flow hole, 14 valve seat body, 15 large gasket, 16 first outer sealing ring, 17 second outer sealing ring, 18 valve seat ring, 181 guide chamber, 1111 annular groove, 182 first through hole, 20 spindle member, 21 large spindle part, 211 small valve port, 212 limiting chamber, 2121 first stop surface, 2122 second stop surface, 213 guide hole, 214 side opening, 215 large spindle, 216 small gasket, 22 small spindle, 221 limiting rod, 222 sealing rod, 2221 fillet, 223 stop shoulder, 23 drive assembly, 231 screw, 232 connecting sleeve, 233 bearing, 234 bush, 235 second elastic member, 24 sealing ring, 41 nut structure, 411 nut body, 412 connecting plate, 4121 open slot, 42 screw assembly, 4221 second through hole, 30 valve sleeve, 31 body structure, 312 first sleeve, 313 second sleeve, 32 sealing sleeve, 321 arcuate surface, 3211 third through hole, 3221 fourth through hole, 34 second inner sealing ring, 50 rotor chamber, 60 Balancing passage, 61 1st passage, 62 2nd passage, 63 3rd passage, 64 4th passage. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] 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 merely some of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is actually merely explanatory, and does not impose any restrictions on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present application.

[0021] As shown in FIG. 1 to FIG. 4, an embodiment of the present application includes a valve seat member 10 having a large valve port 11, and a spindle member 20 provided in a chamber of the valve seat member 10, the spindle member 20 including a large spindle portion 21, a small spindle 22, and a drive assembly 23, the large spindle portion 21 having a small valve port 211, the small valve port 211 having a flow control surface, a large end of the opening of the small valve port 211 being separated from the large valve port 11, and the drive assembly 23, the small spindle 22, and the large spindle portion 21, and a spindle member 20 which is also drivingly connected to the small valve port 211, and which has a closed state, a flow rate adjusting state and a fully open state, wherein in the closed state, the small spindle 22 is inserted into the small valve port 211 to seal the small valve port 211 and the large spindle portion 21 seals the large valve port 11, in the flow rate adjusting state, the large spindle portion 21 seals the large valve port 11, the small spindle 22 is axially movable to adjust the opening degree of the small valve port 211, and in the fully open state, the large spindle portion 21 avoids the large valve port 11.

[0022] When this embodiment is adopted, the small spindle 22 is inserted into the small valve port 211 to seal the small valve port 211, the large spindle portion 21 seals the large valve port 11, and the drive assembly 23 is arranged to be driven and connected to the small spindle 22 and the large spindle portion 21, so that the small spindle 22 moves in the axial direction to adjust the opening of the small valve port 211, thereby realizing the adjustment of the small flow rate. The large spindle portion 21 seals or avoids the large valve port 11, thereby realizing the conduction and blocking of the large flow rate. Here, when the electronic expansion valve is in a closed state, the small spindle 22 seals the small valve port 211, and the large spindle portion 21 seals the large valve port 11. When the electronic expansion valve is in a flow rate adjustment state, the drive assembly 23 drives the small spindle 22 to move in the axial direction to adjust the opening of the small valve port 211, and the large spindle portion 21 seals the large valve port 11, thereby realizing the adjustment of the small flow rate. When the electronic expansion valve is in a fully open state, the drive assembly 23 drives the small spindle 22 to move it until it completely clears the small valve port 211, and then the small spindle 22 moves the large spindle portion 21 in the axial direction in conjunction with the small spindle 22 until the large spindle portion 21 completely clears the large valve port 11, thereby achieving the fully open state. This electronic expansion valve may be mounted on a mounting base or inside a valve body.

[0023] Specifically, by making the flow rate adjustment surface of the small valve port 211 tapered and by having the larger end of the opening of the small valve port 211 face the small spindle 22, the flow rate can be adjusted more accurately by engagement between the small spindle 22 and the small valve port 211 to meet usage requirements, and by providing a flow rate adjustment inclined surface on the small valve port 211, the difficulty of machining the small spindle 22 is reduced.

[0024] Here, the outer diameter of the small spindle 22 is larger than the minimum diameter of the small valve port 211, and the flow area of ​​the large valve port 11 is larger than the flow area of ​​the small valve port 211. The opening degree of the small valve port 211 means the degree to which the small valve port 211 is opened, or may be understood as the size of the flow area of ​​the small valve port 211. The valve seat member has a communication hole, and in the closed state, the communication hole does not communicate with either the large valve port 11 or the small valve port 211, and in the flow rate adjustment state, the communication hole communicates with the large valve port 11 via the small valve port 211, and in the fully open state, the communication hole communicates directly with the large valve port 11.

[0025] Furthermore, the end face of the large valve port 11 is a sealing plane 111, and in the closed state, one end of the large spindle portion 21 abuts against the sealing plane 111. By providing the end face of the large valve port 11 as the sealing plane 111, it becomes easier for one end of the large spindle portion 21 to abut against the sealing plane 111 when the electronic expansion valve is in the closed state, and compared with the inclined surface sealing method, this sealing method makes it easier to determine and control the sealing point, so that in the case where the large spindle portion 21 is provided with an equalizing passage communicating between the upper and lower ends, the sealing point can be controlled to make the pressure areas of the upper and lower ends of the large spindle portion 21 closer to each other, thereby achieving pressure equalization at the upper and lower ends.

[0026] Specifically, the large spindle part 21 has a limiting chamber 212 and a guide hole 213 which are connected to each other, the limiting chamber 212, the guide hole 213 and the small valve port 211 are arranged in sequence, the small spindle 22 includes a limiting rod 221 and a sealing rod 222 which are connected to each other, the limiting rod 221 is arranged in the limiting chamber 212 so as to be movable in the axial direction, the sealing rod 222 passes through the guide hole 213, and the driving assembly 23 and the limiting rod 221 are drivingly connected. By adopting the above-mentioned installation manner, the driving assembly 23 moves the limiting rod 221 in the axial direction in cooperation with each other, and the limiting rod 221 moves the sealing rod 222 in the axial direction in cooperation with each other, that is, the sealing rod 222 adjusts the opening degree of the small valve port 211, and further realizes the function of adjusting a small flow rate.

[0027] Here, in the axial direction of the spindle member 20, the limiting chamber 212 has a first stop surface 2121 and a second stop surface 2122 facing each other, one side of the limiting rod 221 is stop-engaged with the first stop surface 2121, and the small spindle 22 further includes a stop shoulder 223 provided on the side wall of the limiting rod 221, which is stop-engaged with the second stop surface 2122. The provision of the first stop surface 2121 can provide a limiting effect in the process of the limiting rod 221 moving toward the side close to the small valve orifice 211. The provision of the stop shoulder 223 and the second stop surface 2122 can provide a limiting effect in the process of the limiting rod 221 moving toward the side away from the small valve orifice 211. This limits the movement range of the limiting rod 221.

[0028] In addition, the spindle member 20 further includes a first elastic member 12, both ends of which are respectively abutted against the first stop surface 2121 and the stop shoulder 223. By arranging both ends of the first elastic member 12 to abut against the first stop surface 2121 and the stop shoulder 223, respectively, when the electronic expansion valve is in a closed state, the first elastic member 12 is in a compressed state, and when the driving assembly 23 moves the limiting rod 221 in conjunction with the side away from the small valve port 211, that is, in a flow rate adjusting state, the elastic force of the first elastic member 12 is released, and the stop shoulder 223 is moved in conjunction with the side away from the small valve port 211 to open the small valve port 211.

[0029] In this embodiment, the outer diameter of the limiting rod 221 is larger than that of the sealing rod 222, the first elastic member 12 is a spring fitted to the limiting rod 221, and the stop shoulder 223 is an annular structure. By making the outer diameter of the limiting rod 221 larger than that of the sealing rod 222, the limiting rod 221 can perform a limiting function. By making the first elastic member 12 a spring fitted to the limiting rod 221, the strength is high and the cost is low. By making the stop shoulder 223 an annular structure, it is easy to engage with the spring.

[0030] Specifically, the drive assembly 23 includes a screw assembly 42, which includes a screw 231 and a connecting sleeve 232, one end of the connecting sleeve 232 is connected to the small spindle 22, the screw 231 and the connecting sleeve 232 are limitedly engaged in the axial direction, the screw 231 is axially movable, the screw 231 can move the small spindle 22 independently in a predetermined stroke, and the screw 231 can move the spindle 21 in a linked manner by the small spindle 22. By adopting the above-mentioned installation method, the screw 231 and the connecting sleeve 232 are limitedly engaged in the axial direction, and one end of the connecting sleeve 232 is connected to the small spindle 22, so that when the screw 231 moves in the axial direction, the connecting sleeve 232 can move in a linked manner in the axial direction, and further, the connecting sleeve 232 can move the small spindle 22 in a linked manner in the axial direction.

[0031] Here, the large spindle part 21 has an escape hole, the connecting sleeve 232 passes through the escape hole, and one end of the small spindle 22 remote from the small valve port 211 penetrates into the connecting sleeve 232 and is fixedly connected to the connecting sleeve 232. The provision of the escape hole makes it easy to fix the one end of the small spindle 22 remote from the small valve port 211 to the connecting sleeve 232, and the fixed connection is made by welding, which is reliable and stable.

[0032] 2, the drive assembly 23 further includes a bearing 233, a bush 234 and a second elastic member 235 arranged in the connecting sleeve 232, the bearing 233 is fitted to one end of the screw 231, one side of the bearing 233 and the connecting sleeve 232 are limitedly engaged in the axial direction, and the other side of the bearing 233, the bush 234, the second elastic member 235 and the small spindle 22 are abutted in sequence. By fitting the bearing 233 to one end of the screw 231 and limitingly engaging one side of the bearing 233 with the connecting sleeve 232 in the axial direction, not only can the bearing 233 be limited, but also the connecting sleeve 232 can be prevented from rotating when the screw 231 rotates, so as to further prevent the small spindle 22 from rotating. The other side of the bearing 233, the bush 234, the second elastic member 235 and the small spindle 22 are in contact with each other in this order, and the provision of the bush 234 not only prevents the second elastic member 235 from directly contacting the bearing 233, but also serves as a guide. The provision of the second elastic member 235 allows the second elastic member 235 to be compressed when the electronic expansion valve is in a closed state, and when the screw 231 moves away from the small valve port 211, i.e., in a flow rate adjustment state, the elasticity of the second elastic member 235 is released, and the bush 234 is moved away from the small valve port 211 in conjunction with the second elastic member 235, thereby realizing accurate control of the opening degree of the small valve port 211 and further improving the control accuracy of the small flow rate adjustment. Here, the second elastic member 235 may be a spring.

[0033] Specifically, the valve seat member 10 has a through hole 13, and the large spindle portion 21 has a side opening 214, which is located on one side of the small valve port 211 away from the large valve port 11, and in the flow rate adjustment state, the through hole 13, the side opening 214, the small valve port 211 and the large valve port 11 are sequentially communicated with each other. By providing the through hole 13 and the side opening 214, in the flow rate adjustment state, the through hole 13, the side opening 214, the small valve port 211 and the large valve port 11 can be sequentially communicated with each other.

[0034] Alternatively, the large spindle part 21 includes a main body part, a small valve seat and a limiting structure, the small valve seat is disposed in the chamber of the main body part, the small valve seat has a small valve port 211 provided with a flow control surface, the small spindle 22 is movably disposed in the main body part, the small spindle 22 and the small valve seat are engaged to adjust the opening degree of the small valve port 211, and the limiting structure is limitedly engaged with one side of the small valve seat away from the small spindle 22. Providing the small valve seat is advantageous for more accurately processing the flow control surface. More preferably, the small valve seat may adopt a gasket to form a soft seal.

[0035] Further, the valve seat member 10 includes a valve seat body 14, a large gasket 15, a first outer sealing ring 16 and a second outer sealing ring 17, the large gasket 15 is located in the chamber of the valve seat body 14, the large gasket 15 has a large valve port 11, the valve seat body 14 has a flow hole 13, the first outer sealing ring 16 and the second outer sealing ring 17 are fitted to the outer wall of the valve seat body 14, and the flow hole 13 is located between the first outer sealing ring 16 and the second outer sealing ring 17. By positioning the large gasket 15 in the chamber of the valve seat body 14 and positioning the large valve port 11 in the large gasket 15, there is a better sealing effect when the large valve port 11 is closed, and the leakage of the fluid is prevented. By providing the first outer sealing ring 16 and the second outer sealing ring 17, it is easy to realize the sealing connection with the valve seat member 10 of the electronic expansion valve by the external engagement structure, and the leakage of the flow hole 13 is avoided.

[0036] As shown in Figures 5 to 7, the sealing rod 222 is cylindrical and is used to engage with the inner wall of the small valve orifice 211 to adjust the opening degree of the small valve orifice 211, where one end of the sealing rod 222 facing the small valve orifice 211 has a fillet 2221. When the sealing rod 222 seals the small valve orifice 211, the abutment position between the sealing rod 222 and the inner wall of the small valve orifice 211 forms an annular sealing line, and the sealing line is located at the fillet 2221.

[0037] When this embodiment is adopted, the sealing rod 222 is cylindrical and has a fillet 2221 at one end of the sealing rod 222 facing the small valve orifice 211. When the sealing rod 222 seals the small valve orifice 211, the abutting position between the sealing rod 222 and the inner wall of the small valve orifice 211 forms an annular sealing line. By arranging the sealing line to be located at the fillet 2221, when the sealing rod 222 seals the small valve orifice 211, the direction of the force received by the sealing rod 222 when the small valve orifice 211 sucks air is The force is directed away from the small valve port 211, and the magnitude of the force is the product of the pressure strength of the intake port and the area difference between the outer diameter of the sealing rod 222 and the diameter of the sealing line. Compared with the prior art, the sealing rod 222 in this embodiment is cylindrical, and the sealing line is located at the fillet of the sealing rod 222, that is, the area difference between the outer diameter of the sealing rod 222 and the diameter of the sealing line is minimized so as to minimize the force received by the sealing rod 222, thereby optimizing the problem of poor closing of the electronic expansion valve. This electronic expansion valve may be mounted on a mounting base or in a valve body.

[0038] Here, the radius of the fillet 2221 is R, and R≦1mm. By limiting the radius R of the fillet 2221 within the above range, it is not only easy to seal the small valve port 211, but also the force received by the sealing rod 222 can be minimized, and the area difference between the outer diameter of the sealing rod 222 and the diameter of the sealing line can be minimized, thereby optimizing the problem of poor closing of the electronic expansion valve. As shown in FIG. 7, the area of ​​the area surrounded by the outer diameter of the sealing rod 222 is S5, the area of ​​the area surrounded by the sealing line is S6, and the sealing line is located within the fillet 2221.

[0039] 5, the spindle member 20 further includes a sealing ring 24, which is disposed within the large spindle portion 21, and the sealing rod 222 passes through the sealing ring 24. The sealing ring 24 is disposed within the large spindle portion 21, and the sealing rod 222 passes through the sealing ring 24, thereby providing a sealing effect for the sealing rod 222 and preventing fluid leakage.

[0040] Specifically, the large spindle part 21 includes a large spindle 215 and a small gasket 216 provided in the large spindle 215, the small gasket 216 having a small valve port 211, and the small gasket 216 is made of a soft material. The small gasket 216 is provided in the large spindle 215 to provide a sealing effect for the small valve port 211 and prevent fluid leakage. In addition, if the small gasket 216 is made of a soft material, the sealing effect can be improved, and specifically, the material of the small gasket 216 can be plastic or rubber.

[0041] 8 to 13, the electronic expansion valve further includes a valve sleeve 30 connected to the valve seat member 10, a drive assembly 23 provided in a chamber of the valve seat member 10 and the valve sleeve 30, wherein an area between a structure of the drive assembly 23 located in the valve sleeve 30 and an inner wall of the valve sleeve 30 forms a rotor chamber 50, the drive assembly 23 and the small spindle 22 are drivingly connected to each other, and a balancing passage 60 communicating the rotor chamber 50 and the small valve port 211.

[0042] In this embodiment, the balancing passage 60 is provided to communicate the rotor chamber 50 with the small valve port 211, and thus the pressure at the small valve port 211 and the pressure in the rotor chamber 50 can always be made equal when the electronic expansion valve is in operation, ensuring that the inside of the electronic expansion valve can achieve an optimal balancing effect, and avoiding the problem of poor valve closing caused by a relatively large pressure difference between the rotor chamber 50 and the small valve port 211. In this embodiment, the drive assembly 23 moves the small spindle 22 in conjunction with the small spindle 22, and the movement of the small spindle 22 adjusts the opening degree of the small valve port 211 to achieve the function of flow rate adjustment. This electronic expansion valve may be mounted on a mounting base or in a valve body.

[0043] Here, the valve seat member 10 includes a valve seat ring 18 and a valve seat body 14, the valve sleeve 30, the valve seat ring 18 and the valve seat body 14 are connected in sequence, the drive assembly 23 includes a nut structure 41, the nut structure 41 is located in the valve sleeve 30, and the area between the nut structure 41 and the inner wall of the valve sleeve 30 forms a rotor chamber 50. By adopting the above installation manner, the nut structure 41 is disposed in the valve sleeve 30, so that the area between the nut structure 41 and the inner wall of the valve sleeve 30 forms the rotor chamber 50.

[0044] Optionally, the electronic expansion valve further includes a rotor member, the rotor member being disposed within the valve sleeve 30, the rotor member being used to drive and rotate the screw assembly 42, and having a gap between the rotor member and an inner wall of the valve sleeve 30.

[0045] Furthermore, the balancing passage 60 includes a first passage 61, a second passage 62, a third passage 63, and a fourth passage 64, which are sequentially connected to each other, where the first passage 61 is located in the nut structure 41, the second passage 62 is located in the valve seat ring 18, the third passage 63 is located in the screw assembly 42, and the fourth passage 64 is located in the small spindle 22. By providing the first passage 61 in the nut structure 41, the second passage 62 in the valve seat ring 18, the third passage 63 in the screw assembly 42, and the fourth passage 64 in the small spindle 22, the rotor chamber 50 and the small valve port 211 are connected to each other through the balancing passage 60, and the problem of poor valve closing caused by a relatively large pressure difference between the rotor chamber 50 and the small valve port 211 is avoided.

[0046] Here, the nut structure 41 includes a nut body 411 and a connecting plate 412, the connecting plate 412 is fitted into the nut body 411, the connecting plate 412 and the valve seat ring 18 are welded together, and the openings or open slots 4121 in the connecting plate 412 form the first passage 61. The connecting plate 412 and the valve seat ring 18 are connected by a welding method, which is stable and reliable. The openings or open slots 4121 in the connecting plate 412 can all form the first passage 61, thereby realizing communication between the rotor chamber 50 and the first passage 61.

[0047] In this embodiment, the valve seat ring 18 has a guide chamber 181 and a first through hole 182, the inner wall of the guide chamber 181 has an annular groove 1111, a part of the large spindle portion 21 is located in the guide chamber 181, the first through hole 182 and the annular groove 1111 are connected, and the first through hole 182 and the annular groove 1111 form the second passage 62. By providing the guide chamber 181, it is easy to provide a part of the large spindle portion 21 in the guide chamber 181. Since the first through hole 182 and the annular groove 1111 are connected, and the first passage 61 and the second passage 62 are connected, the pressure in the rotor chamber 50 and the pressure in the annular groove 1111 can be kept the same. Here, the annular groove 1111 is connected to the third passage 63. Alternatively, the valve seat ring 18 has a guide chamber 181 and a first through hole 182 therein, a part of the large spindle portion 21 is located within the guide chamber 181 , and the first through hole 182 forms the second passage 62 .

[0048] Specifically, the screw 231 is screwed into the nut structure 41, the connecting sleeve 232 is connected to the small valve core 22, the fourth passage 64 is connected to the chamber in the connecting sleeve 232, and the side wall of the connecting sleeve 232 has a second through hole 4221, which forms the third passage 63. By adopting the above installation manner, the connecting sleeve 232 is connected to the small valve core 22, and the fourth passage 64 is connected to the chamber in the connecting sleeve 232, so that the pressure in the chamber in the connecting sleeve 232 is the same as the fourth passage 64. The second through hole 4221 is installed to make the pressure in the connecting sleeve 232 and the pressure in the annular groove 1111 the same, so that the pressure in the rotor chamber 50 and the pressure in the fourth passage 64 can be kept the same. Here, the screw assembly 42 includes the screw 231 and the connecting sleeve 232.

[0049] In this embodiment, the limit rod 221 and the large spindle part 21 are engaged in an axial direction, the sealing rod 222 is used to engage with the small valve port 211, the limit rod 221 has a third through hole 3211, and the sealing rod 222 has a fourth through hole 3221, and the third through hole 3211 and the third through hole 3211 form a fourth passage 64. The outer diameter of the limit rod 221 is larger than that of the sealing rod 222, and the limit rod 221 and the large spindle part 21 are engaged in an axial direction, which can play a limiting role on the small spindle 22 and limit the movement range of the small spindle 22. Since the third through hole 3211 and the fourth through hole 3221 are connected, and the fourth through hole 3221 and the small valve port 211 are connected, the pressure in the rotor chamber 50 and the pressure in the small valve port 211 can be kept the same, and communication between the rotor chamber 50 and the small valve port 211 is achieved through the balancing passage 60.

[0050] In this embodiment, the spindle member 20 further includes a second inner sealing ring 34, which is located between the outer wall of the large spindle portion 21 and the inner wall of the valve seat member 10. The provision of the second inner sealing ring 34 can ensure the sealing between the outer wall of the large spindle portion 21 and the inner wall of the valve seat member 10.

[0051] As shown in FIG. 14 to FIG. 16, the electronic expansion valve further includes a large gasket 15 disposed in the valve seat member 10 and having a large valve port 11, the large spindle 215 includes a main body structure 31 and a sealing sleeve 32 connected to each other, an end of the sealing sleeve 32 is used to engage with the large gasket 15 to open and close the large valve port 11, the main body structure 31 and the inner wall of the valve seat member 10 are sealed engaged, the radial cross-sectional area of ​​the outer peripheral surface of the main body structure 31 is S3, when the sealing sleeve 32 abuts against the large gasket 15, a contact surface is formed between the sealing sleeve 32 and the large gasket 15 surrounding the large valve port 11, the area of ​​the outer peripheral edge of the contact surface is S2, and the area of ​​the inner peripheral edge of the contact surface is S1, where S1 is the area of ​​the inner peripheral edge of the contact surface. <S3<S2である。

[0052] In this embodiment, by communicating the rotor chamber 50 and the valve port 211 through the equalizing passage 60, the fluid pressure intensities on both sides of the spindle member 20 become the same, that is, both become the fluid pressure intensity in the large valve port 11. Thus, when the large valve port 11 is closed and the fluid flow direction of the electronic expansion valve is from the chamber of the valve seat member 10 to the large valve port 11, the fluid pressure intensity is P1, the fluid pressure received by the spindle member 20 is P1(S2 - S3), and the force receiving direction is the valve closing direction. When the fluid flow direction of the electronic expansion valve is from the large valve port 11 to the chamber of the valve seat member 10, the fluid pressure intensity is P2, the fluid pressure received by the spindle member 20 is P2(S3 - S1), and the force receiving direction is the valve closing direction. Therefore, according to the above embodiment, regardless of the fluid flow direction in the electronic expansion valve, when the large valve port 11 is closed, the forces exerted by the fluid on the spindle member 20 are all in the valve closing direction, ensuring the reliability of the electronic expansion valve during valve closing and avoiding internal leakage. This electronic expansion valve may be used by being mounted on a mounting base or in a valve body.

[0053] In this embodiment, the large gasket 15 is made of a soft material, and the end face of the large gasket 15 is engaged with the end of the sealing sleeve 32. Thus, when the sealing sleeve 32 is pressed against the large gasket 15, a recess is formed in the large gasket 15, the contact area of the contact surface increases, and the sealing effect is improved.

[0054] Here, the end face of the sealing sleeve 32 facing the large gasket 15 is an arc-shaped surface 321, and the contact surface is located within the arc-shaped surface 321. By providing the end face of the sealing sleeve 32 facing the large gasket 15 as the arc-shaped surface 321, the large gasket 15 is more easily deformed during valve closing, and the contact area of the contact surface increases. Optionally, in the cross-section passing through the axis of the sealing sleeve 32, the arc-shaped surface 321 is divided by the extension line of the outer wall of the main body structure 31 into symmetric arcs, so that a part of the contact surface is located within the outer peripheral surface of the main body structure 31 and the other part is located outside the outer peripheral surface of the main body structure 31 can be ensured, ensuring S1 < S3 < S2 and improving the reliability of valve closing.

[0055] Furthermore, both the main body structure 31 and the sealing sleeve 32 are cylindrical structures. The main body structure 31, the sealing sleeve 32, and the large valve port 11 are provided coaxially. The outer diameter of the main body structure 31 is D3, the outer diameter of the sealing sleeve 32 is D2, and the inner diameter of the sealing sleeve 32 is D1. Here, D1 < D3 < D2.

[0056] Specifically, in FIG. 14, the region surrounded by the outer peripheral edge of the sealing sleeve 32 is defined as S4. When in use, when the fluid flow direction of the electronic expansion valve is from the chamber of the valve seat member 10 to the large valve port 11, the pressure intensity at the large valve port 11 is smaller than P1 and may be regarded as the atmospheric environment. The upward pressure of P1 received by the spindle member 20 is the force applied by P1 to the gap between the lower end surface of the sealing sleeve 32 and the large gasket 15, that is, P1(S4 - S2). The downward pressure of P1 received by the spindle member 20 is the force applied by P1 to the upper end surface of the sealing sleeve 32, that is, P1(S4 - S3). Since S3 < S2, the resultant force of the upward force and the downward force is the downward P1(S2 - S3). In this way, the direction of the resultant force coincides with the valve closing direction, ensuring the reliability of valve closing. When the fluid flow direction of the electronic expansion valve is from the large valve port 11 to the chamber of the valve seat member 10, the pressure intensity in the chamber of the valve seat member 10 is smaller than P1 and may be regarded as communicating with the external atmospheric environment. The upward pressure of P2 received by the spindle member 20 is P2S1, the downward pressure intensity received by the spindle member 20 is equal to P2, and the downward pressure is P2S3. Since S1 < S3, the resultant force of the two is the downward P2(S3 - S1). In this way, the direction of the resultant force coincides with the valve closing direction, ensuring the reliability of valve closing.

[0057] With the above design, regardless of whether the gas or liquid enters horizontally or vertically, the force receiving direction of the sealing sleeve 32 and the valve closing direction always coincide for the electronic expansion valve, thus avoiding the problem that the valve cannot be completely closed due to too high fluid pressure and malfunctioning, and improving the valve closing reliability of the electronic expansion valve.

[0058] As shown in FIG. 15, the main body structure 31 includes a first sleeve 312 and a second sleeve 313 connected to each other, where the second sleeve 313 and the sealing sleeve 32 are an integral structure, the seat member 10 includes a seat ring 18 and a seat body 14 connected to each other, the large gasket 15 is located in the seat body 14, the first sleeve 312 is located in the seat ring 18, and the first sleeve 312 and the seat ring 18 are sealedly engaged. As described above, the main body structure 31 is provided as a separate structure, which makes it easy to process and assemble. The second sleeve 313 and the sealing sleeve 32 are provided as an integral structure, which can improve the structural strength. Optionally, the flow hole 13 is not provided in the seat ring 18 but is located in the seat body 14, which can shorten the length of the seat ring 18 and simplify the structure of the seat ring 18, making it easy to process the seat ring 18.

[0059] 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. a valve seat member (10) having a large valve port (11); a spindle member (20) disposed within a chamber of the valve seat member (10), the spindle member (20) including a large spindle portion (21), a small spindle (22) and a drive assembly (23), the large spindle portion (21) having a small valve port (211) having a flow control surface, a larger end of the opening of the small valve port (211) being spaced apart from the large valve port (11), the drive assembly (23) being drivingly connected to the small spindle (22) and the large spindle portion (21); The valve has a closed state, a flow rate adjusting state, and a fully open state, wherein in the closed state, the small spindle (22) is inserted into the small valve port (211) to seal the small valve port (211) and the large spindle portion (21) seals the large valve port (11); in the flow rate adjusting state, the large spindle portion (21) seals the large valve port (11), the small spindle (22) is provided so as to be movable in the axial direction to adjust the opening degree of the small valve port (211); and in the fully open state, the large spindle portion (21) avoids the large valve port (11). Electronic expansion valve.

2. the flow rate adjusting surface is a tapered surface, In the closed state, the small spindle (22) is in contact with the small valve port (211), and / or the end surface of the large valve port (11) is a sealing plane (111); 2. The electronic expansion valve according to claim 1, wherein in the closed state, one end of the large spindle portion (21) abuts against the sealing flat surface (111).

3. The large spindle portion (21) has a restricting chamber (212) and a guide hole (213) which are connected to each other, The restricting chamber (212), the guide hole (213) and the small valve port (211) are provided in this order, The small spindle (22) includes a limiting rod (221) and a sealing rod (222) connected to each other, The limiting rod (221) is axially movably disposed within the limiting chamber (212); The sealing rod (222) passes through the guide hole (213), 2. The electronic expansion valve of claim 1, wherein the drive assembly (23) and the limiting rod (221) are drivingly connected.

4. In the axial direction of the spindle member (20), the restricting chamber (212) has opposing first and second stop surfaces (2121 and 2122), One side of the limit rod (221) is stop-engaged with the first stop surface (2121); The small spindle (22) further comprises a stop shoulder (223) provided on the side wall of the limit rod (221), 4. The electronic expansion valve of claim 3, wherein the stop shoulder (223) is stop-engaged with the second stop surface (2122).

5. The spindle member (20) further includes a first elastic member (12), The electronic expansion valve according to claim 4, wherein both ends of the first elastic member (12) are abutted against the first stop surface (2121) and the stop shoulder (223), respectively.

6. The outer diameter of the limiting rod (221) is greater than the outer diameter of the sealing rod (222); The first elastic member (12) is a spring fitted to the limiting rod (221), The electronic expansion valve of claim 5, wherein the stop shoulder (223) is an annular structure.

7. The drive assembly (23) includes a screw assembly (42); The screw assembly (42) includes a screw (231) and a connecting sleeve (232), One end of the connecting sleeve (232) is connected to the small spindle (22); The screw (231) and the connecting sleeve (232) are in axial limited engagement; The screw (231) is provided so as to be movable in the axial direction, The screw (231) can move the small spindle (22) independently within a predetermined stroke in conjunction with the small spindle (22); and The electronic expansion valve according to claim 3, wherein the screw (231) can move the large spindle portion (21) in conjunction with the small spindle (22).

8. The large spindle portion (21) has an escape port, The connecting sleeve (232) passes through the escape port, 8. The electronic expansion valve according to claim 7, wherein one end of the small spindle (22) remote from the small valve port (211) is inserted into the connecting sleeve (232) and fixedly connected to the connecting sleeve (232).

9. The drive assembly (23) further includes a bearing (233), a bushing (234), and a second elastic member (235) provided in the connecting sleeve (232), The bearing (233) is fitted to one end of the screw (231), One side of the bearing (233) and the connecting sleeve (232) are in limited engagement in the axial direction; The electronic expansion valve according to claim 7, wherein the other side of the bearing (233), the bush (234), the second elastic member (235) and the small spindle (22) are abutted against each other in this order.

10. The valve seat member (10) has a flow hole (13), The large spindle portion (21) has a side opening (214), 2. The electronic expansion valve according to claim 1, wherein the side opening (214) is located on one side of the small valve port (211) away from the large valve port (11), and in the flow rate control state, the flow hole (13), the side opening (214), the small valve port (211) and the large valve port (11) are sequentially connected to each other.

11. The valve seat member (10) includes a valve seat body (14), a large gasket (15), a first outer sealing ring (16) and a second outer sealing ring (17), The large gasket (15) is located within a chamber of the valve seat body (14), The large gasket (15) has the large valve port (11), The valve seat body (14) has the flow hole (13), The first outer sealing ring (16) and the second outer sealing ring (17) are fitted to the outer wall of the valve seat body (14), 11. The electronic expansion valve according to claim 10, wherein the flow hole (13) is located between the first outer sealing ring (16) and the second outer sealing ring (17).

12. The sealing rod (222) is cylindrical; The sealing rod (222) is used to adjust the opening degree of the small valve port (211) by engaging with the inner wall of the small valve port (211); 8. The electronic expansion valve according to claim 7, wherein one end of the sealing rod (222) facing the small valve port (211) has a fillet (2221), and when the sealing rod (222) seals the small valve port (211), the abutment position between the sealing rod (222) and the inner wall of the small valve port (211) forms an annular sealing line, and the sealing line is located at the fillet (2221).

13. The electronic expansion valve of claim 12, wherein the fillet (2221) has a radius R, where R≦1 mm.

14. The spindle member (20) further includes a sealing ring (24); The sealing ring (24) is provided in the large spindle portion (21), The electronic expansion valve of claim 12, wherein the sealing rod (222) passes through the sealing ring (24).

15. The large spindle portion (21) includes a large spindle (215) and a small gasket (216) provided within the large spindle (215), The small gasket (216) has the small valve port (211), The electronic expansion valve of claim 12, wherein the small gasket (216) is made from a soft material.

16. a valve sleeve (30) connected to the valve seat member (10); a drive assembly (23) disposed within the chamber of the valve seat member (10) and the valve sleeve (30), wherein an area between a structure of the drive assembly (23) located within the valve sleeve (30) and an inner wall of the valve sleeve (30) forms a rotor chamber (50); a balancing passage (60) communicating between said rotor chamber (50) and said small valve port (211); The electronic expansion valve of claim 7 further comprising:

17. The valve seat member (10) includes a valve seat ring (18) and a valve seat body (14), the valve sleeve (30), the valve seat ring (18) and the valve seat body (14) are connected in sequence; The drive assembly (23) includes a nut structure (41); The nut structure (41) is located within the valve sleeve (30); 17. The electronic expansion valve of claim 16, wherein the area between the nut structure (41) and an inner wall of the valve sleeve (30) forms the rotor chamber (50).

18. The balancing passage (60) includes a first passage (61), a second passage (62), a third passage (63) and a fourth passage (64) which are connected in sequence, 18. The electronic expansion valve according to claim 17, wherein the first passage (61) is located in the nut structure (41), the second passage (62) is located in the valve seat ring (18), the third passage (63) is located in the screw assembly (42), and the fourth passage (64) is located in the small spindle (22).

19. The nut structure (41) includes a nut body (411) and a connecting plate (412), The connecting plate (412) is fitted to the nut body (411), The connecting plate (412) and the valve seat ring (18) are welded together; 20. The electronic expansion valve of claim 18, wherein an aperture or open slot (4121) in the connecting plate (412) defines the first passage (61).

20. The seat ring (18) has a guide chamber (181) and a first through hole (182) therein. The inner wall of the guide chamber (181) has an annular groove (1111), A portion of the large spindle portion (21) is located within the guide chamber (181); The first through hole (182) and the annular groove (1111) are in communication with each other, the first through hole (182) and the annular groove (1111) form the second passage (62); or The seat ring (18) has a guide chamber (181) and a first through hole (182) therein. A portion of the large spindle portion (21) is located within the guide chamber (181); 20. The electronic expansion valve of claim 18, wherein the first through hole (182) defines the second passage (62).

21. The screw (231) is screwed into the nut structure (41), The connecting sleeve (232) is connected to the small spindle (22), The fourth passage (64) communicates with a chamber in the connecting sleeve (232); The side wall of the connecting sleeve (232) has a second through hole (4221), 20. The electronic expansion valve of claim 18, wherein the second through hole (4221) forms the third passage (63).

22. The limit rod (221) and the large spindle part (21) are engaged in an axial direction; The sealing rod (222) is used to engage the small valve orifice (211); The limiting rod (221) has a third through hole (3211), The sealing rod (222) has a fourth through hole (3221) therein; The electronic expansion valve of claim 18, wherein the third through hole (3211) and the fourth through hole (3221) form the fourth passage (64).

23. The spindle member (20) further includes a second inner sealing ring (34); 17. The electronic expansion valve according to claim 16, wherein the second inner sealing ring (34) is located between an outer wall of the large spindle portion (21) and an inner wall of the valve seat member (10).

24. The valve further includes a large gasket (15) disposed within the valve seat member (10) and having the large valve port (11), The large spindle (215) includes a body structure (31) and a sealing sleeve (32) connected to each other, The end of the sealing sleeve (32) is used to engage with the large gasket (15) to open and close the large valve port (11); The body structure (31) and an inner wall of the valve seat member (10) are in sealing engagement; The radial cross-sectional area of ​​the outer circumferential surface of the body structure (31) is S3; When the sealing sleeve (32) is abutted against the large gasket (15), a contact surface is formed between the sealing sleeve (32) and the large gasket (15) surrounding the large valve port (11); 16. The electronic expansion valve of claim 15, wherein an area of ​​an outer periphery of the contact surface is S2 and an area of ​​an inner periphery of the contact surface is S1, where S1<S3<S2.

25. Said large gasket (15) is made of a soft material, 25. The electronic expansion valve according to claim 24, wherein an end face of the large gasket (15) is engaged with an end of the sealing sleeve (32).

26. The end surface of the sealing sleeve (32) facing the large gasket (15) is an arcuate surface (321); 26. The electronic expansion valve of claim 25, wherein the contact surface is located within the arcuate surface (321).

27. The body structure (31) and the sealing sleeve (32) are both cylindrical structures; The body structure (31), the sealing sleeve (32) and the large valve port (11) are arranged coaxially, 25. The electronic expansion valve of claim 24, wherein the outer diameter of the body structure (31) is D3, the outer diameter of the sealing sleeve (32) is D2, and the inner diameter of the sealing sleeve (32) is D1, where D1<D3<D2.

28. The body structure (31) includes a first sleeve (312) and a second sleeve (313) connected to each other; 25. The electronic expansion valve according to claim 24, wherein the second sleeve (313) and the sealing sleeve (32) are of one-piece construction, the seat member (10) includes a seat ring (18) and a seat body (14) connected to each other, the large gasket (15) is located within the seat body (14), the first sleeve (312) is located within the seat ring (18), and the first sleeve (312) and the seat ring (18) are sealingly engaged.

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