WO2023143203A1 - Electronic expansion valve - Google Patents

Abstract

An electronic expansion valve, comprising: a valve seat member (10) having a large valve port (11); and a valve needle member (20), which is arranged inside a cavity of the valve seat member and comprises a larger valve needle portion (21), a smaller valve needle (22), and a driving assembly (23), wherein the larger valve needle portion is provided with a small tapered valve port (211), the end of the small valve port with a large opening faces away from the large valve port, and the driving assembly is in driving connection with the smaller valve needle and the larger valve needle portion. The electronic expansion valve has a closed state in which the smaller valve needle is inserted into the small valve port to block the small valve port and the larger valve needle portion blocks the large valve port, a flow regulating state in which the larger valve needle portion blocks the large valve port and the smaller valve needle is axially movably arranged to regulate the opening of the small valve port, and a fully-opened state in which the larger valve needle portion avoids the large valve port. The electronic expansion valve can solve the problem of an electronic expansion valve in the prior art being unable to realize small-flow regulation.

Description

Electronic expansion valve

This application claims the priority of the patent application with the application number 202220249836.5 and the invention name "electronic expansion valve" submitted to the State Intellectual Property Office of China on January 30, 2022; State Intellectual Property Office, the priority of the patent application with application number 202220249818.7 and the name of the invention is "electronic expansion valve"; The priority of the patent application for "electronic expansion valve"; this application claims the priority of the patent application with the application number 202220249837.X and the invention name "electronic expansion valve" submitted to the State Intellectual Property Office on January 30, 2022 .

technical field

The present application relates to the technical field of electronic expansion valves, in particular, to an electronic expansion valve.

Background technique

At present, in various refrigeration and heating equipment such as air conditioners, refrigerators, heat pump water heaters, etc., electronic expansion valves are usually used to regulate the flow of fluids. The electronic expansion valve is usually composed of a valve seat part, a valve needle part and a drive assembly. The valve seat part usually includes a valve seat and a connecting pipe. The valve seat has a valve port, and the opening of the valve port is adjusted by the movement of the valve needle part. , to achieve flow control. The electronic expansion valve in the prior art can usually realize the regulation of large flow rate, but cannot adjust the small flow rate. Therefore, it is necessary to design an electronic expansion valve that can realize both small flow regulation and large flow regulation.

application content

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 regulation.

In order to solve the above problems, the application provides an electronic expansion valve, including: a valve seat part, the valve seat part has a large valve port; a valve needle part, arranged in the cavity of the valve seat part, the valve needle part includes a large valve needle part , small valve needle and driving assembly, the large valve needle has a small valve port, the small valve port has a flow regulating surface, the end of the small valve port with a large opening is away from the large valve port, the driving assembly, the small valve needle, and the large valve needle are all driven Connection; the electronic expansion valve has a closed state, a flow regulation state and a fully open state; wherein, in the closed state, the small valve needle is inserted into the small valve port to block the small valve port, and the large valve needle part blocks the large valve port; in the flow rate In the adjustment state, the large valve needle blocks the large valve port, and the small valve needle can be axially moved to adjust the opening of the small valve port; in the fully open state, the large valve needle avoids the large valve port.

Further, the flow regulating surface is a conical surface, and in the closed state, the small valve needle abuts against the small valve port; and/or, the end face of the large valve port is a sealing plane, and in the closed state, one end of the large valve needle and Seal flat abutment.

Further, the large valve needle part has a limiting cavity and a guide hole that communicate with each other. The limiting cavity, the guiding hole and the small valve port are arranged in sequence. The small valve needle includes a limiting rod and a blocking rod that are connected to each other. The limiting rod can The axial movement is arranged in the limiting cavity, the blocking rod passes through the guide hole, and the driving assembly is connected with the limiting rod by driving.

Further, the axial limit cavity of the valve needle component has opposite first stop surface and second stop surface, and one side of the limit rod is matched with the first stop surface; the small valve needle also includes a set On the stop shoulder on the side wall of the limit rod, the stop shoulder cooperates with the stop of the second stop surface.

Further, the valve needle component further includes a first elastic member, and the two ends of the first elastic member abut against the first stop surface and the stop shoulder respectively.

Further, the outer diameter of the limiting rod is larger than that of the blocking rod, the first elastic member is a spring sleeved on the limiting rod, and the stopper shoulder is in an annular structure.

Further, the drive assembly includes a screw and a connecting sleeve, one end of the connecting sleeve is connected to the small valve needle, the screw and the connecting sleeve are axially limited in cooperation, the screw is axially movable, and the screw can drive the small valve within a preset stroke. The needle moves independently, and the screw can drive the large valve needle to move through the small valve needle.

Further, the large valve needle part has an avoidance opening, the connecting sleeve passes through the avoiding opening, and the end of the small valve needle away from the small valve opening penetrates into the connecting sleeve and is fixedly connected with the connecting sleeve.

Further, the drive assembly also includes a bearing, a bush and a second elastic member arranged in the connecting sleeve. The bearing sleeve is located at one end of the screw rod, and one side of the bearing and the connecting sleeve are axially limited in fit, and the other side of the bearing, The bushing, the second elastic member and the small valve needle abut against each other in sequence.

Further, the valve seat part has a flow hole, and the large valve needle part has a side opening, and the side opening is located on the side of the small valve port away from the large valve port; The valve port and the large valve port are connected in sequence.

Further, the valve seat component includes a valve seat main body, a large sealing gasket, a first outer sealing ring and a second outer sealing ring, the large sealing gasket is located in the cavity of the valve seat main body, the large sealing gasket has a large valve port, and the valve seat main body has The flow hole, the first outer seal ring and the second outer seal ring are sleeved on the outer wall of the valve seat body, and the flow hole is located between the first outer seal ring and the second outer seal ring.

Applying the technical solution of the present application, an electronic expansion valve is provided, including: a valve seat part, the valve seat part has a large valve port; a valve needle part, arranged in the cavity of the valve seat part, the valve needle part includes a large valve needle part , small valve needle and driving assembly, the large valve needle has a small valve port, the small valve port has a flow regulating surface, the end of the small valve port with a large opening is away from the large valve port, the driving assembly, the small valve needle, and the large valve needle are all driven Connection; the electronic expansion valve has a closed state, a flow regulation state and a fully open state; wherein, in the closed state, the small valve needle is inserted into the small valve port to block the small valve port, and the large valve needle part blocks the large valve port; in the flow rate In the adjustment state, the large valve needle blocks the large valve port, and the small valve needle can be axially moved to adjust the opening of the small valve port; in the fully open state, the large valve needle avoids the large valve port. Using this scheme, the small valve needle is inserted into the small valve port to seal the small valve port, and the large valve needle part is used to block the large valve port, and the drive assembly is connected to the small valve needle and the large valve needle part. The axial movement of the valve needle is used to adjust the opening of the small valve port, so as to realize the adjustment of small flow; the on-off of large flow is realized by blocking or avoiding the large valve port by the large valve needle. Among them, when the electronic expansion valve is in the closed state, the small valve needle blocks the small valve port, and the large valve needle part blocks the large valve port; when the electronic expansion valve is in the flow adjustment state, the driving component drives the small valve needle to axially Move to adjust the opening of the small valve port, and the large valve needle blocks the large valve port to realize small flow adjustment; when the electronic expansion valve is fully open, the driving component drives the small valve needle to move to completely avoid the small valve port , the small valve needle drives the large valve needle to move axially until the large valve needle completely avoids the large valve port, thus realizing the fully open state.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide further understanding of the present application, and the schematic embodiments and descriptions of the present application are used to explain the present application, and do not constitute an improper limitation of the present application. In the attached picture:

FIG. 1 shows a first cross-sectional view of an electronic expansion valve provided by an embodiment of the present application;

Fig. 2 shows a cross-sectional view of a valve needle part in the electronic expansion valve in Fig. 1;

Fig. 3 shows a sectional view of a small valve needle and a small valve port in Fig. 1;

Fig. 4 shows a cross-sectional view of the large valve needle part and the large sealing gasket in Fig. 1;

Fig. 5 shows the second cross-sectional view of the electronic expansion valve provided by the embodiment of the present application;

Fig. 6 shows a sectional view of the small valve needle and the small gasket in Fig. 5;

Fig. 7 shows a sectional view of the small valve needle in Fig. 5;

Fig. 8 shows a third cross-sectional view of the electronic expansion valve provided by the embodiment of the present application;

Fig. 9 shows a schematic structural view of the nut structure in Fig. 8;

Figure 10 shows a schematic structural view of the seat ring in Figure 8;

Figure 11 shows a cross-sectional view of the seat ring in Figure 10;

Figure 12 shows a cross-sectional view of the connecting sleeve in Figure 8;

Figure 13 shows a cross-sectional view of the small valve needle in Figure 8;

Fig. 14 shows the fourth cross-sectional view of the electronic expansion valve provided by the embodiment of the present application;

Figure 15 shows a partial enlarged view of Figure 14;

FIG. 16 shows a schematic structural view of the valve needle part in FIG. 14 .

Wherein, the above-mentioned accompanying drawings include the following reference signs:

10. Valve seat part; 11. Large valve port; 111. Sealing plane; 12. First elastic member; 13. Flow hole; 14. Valve seat main body; 15. Large gasket; 16. First outer sealing ring; 17 , the second outer sealing ring; 18, the valve seat ring; 181, the guide cavity; 1111, the annular groove; 182, the first through hole;

20. Valve needle part; 21. Large valve needle part; 211. Small valve port; 212. Limiting chamber; 2121. First stop surface; 2122. Second stop surface; 213. Guide hole; 214. Side opening Hole; 215, large valve needle; 216, small sealing gasket; 22, small valve needle; 221, limit rod; 222, plugging rod; 2221, fillet; 223, stop shoulder; Screw rod; 232, connecting sleeve; 233, bearing; 234, bushing; 235, second elastic member; 24, sealing ring; 41, nut structure; 411, nut main body; 412, connecting plate; 4121, slotting; 42, Screw assembly; 4221, the second through hole;

30. Valve sleeve; 31. Main structure; 312. First sleeve body; 313. Second sleeve body; 32. Blocking sleeve; 321. Arc surface; 3211. Third through hole; 3221. Fourth through hole; 34. The second inner sealing ring;

50. Rotor cavity;

60. Balance channel; 61. First channel; 62. Second channel; 63. Third channel; 64. Fourth channel.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Apparently, the described embodiments are only some of the embodiments of this application, not all of them. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as any limitation of the application, its application or uses. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

As shown in Figures 1 to 4, the embodiment of the present application provides an electronic expansion valve, including: a valve seat part 10, the valve seat part 10 has a large valve port 11; a valve needle part 20, arranged on the valve seat part 10 In the cavity, the valve needle part 20 includes a large valve needle part 21, a small valve needle 22 and a drive assembly 23, the large valve needle part 21 has a small valve port 211, the small valve port 211 has a flow regulating surface, and the small valve port 211 has a large opening One end of the valve is away from the large valve port 11, and the driving assembly 23 is connected to the small valve needle 22 and the large valve needle part 21; the electronic expansion valve has a closed state, a flow regulation state and a fully open state; wherein, in the closed state, the small valve The needle 22 is inserted into the small valve port 211 to block the small valve port 211, and the large valve needle part 21 blocks the large valve port 11; in the state of flow adjustment, the large valve needle part 21 blocks the large valve port 11, and the small valve needle 22 can It is arranged to move axially to adjust the opening degree of the small valve port 211 ; in the fully open state, the large valve needle part 21 avoids the large valve port 11 .

With this solution, the small valve needle 22 is inserted into the small valve port 211 to block the small valve port 211, the large valve needle portion 21 blocks the large valve port 11, and the driving assembly 23, the small valve needle 22, and the large valve needle portion 21 are all The driving connection is set in this way, the opening of the small valve port 211 is adjusted by the axial movement of the small valve needle 22, so as to realize the adjustment of small flow rate; the large flow rate is realized by blocking or avoiding the large valve port 11 by the large valve needle part 21 on and off. Among them, when the electronic expansion valve is in the closed state, the small valve needle 22 blocks the small valve port 211, and the large valve needle part 21 blocks the large valve port 11; when the electronic expansion valve is in the flow regulating state, the driving assembly 23 drives The small valve needle 22 moves axially to adjust the opening of the small valve port 211, and the large valve needle part 21 blocks the large valve port 11 to realize small flow adjustment; when the electronic expansion valve is fully open, the driving assembly 23 drives the small When the valve needle 22 moves to completely avoid the small valve port 211 , the small valve needle 22 drives the large valve needle portion 21 to move axially until the large valve needle portion 21 completely avoids the large valve port 11 , thereby realizing a fully open state. The electronic expansion valve can be installed on the installation base or in the valve body.

Specifically, the flow regulating surface of the small valve port 211 is set to be tapered, and the end of the small valve port 211 with a large opening is facing the small valve needle 22, so that with the cooperation of the small valve needle 22 and the small valve port 211, more accurate The flow adjustment can be realized efficiently to meet the use requirements, and the flow adjustment slope is set on the small valve port 211 to reduce the processing difficulty of the small valve needle 22 .

Among them, the outer diameter of the small valve needle 22 is greater than the minimum diameter of the small valve port 211; 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 refers to the opening degree of the small valve port 211 , can also be understood as the size of the flow area of the small valve port 211; the valve seat part has a flow hole, and the flow hole is not connected to the large valve port 11 and the small valve port 211 in the closed state. In the state of flow adjustment, the flow hole communicates with the large valve port 11 through the small valve port 211 , and in the fully open state, the flow hole communicates directly with the large valve port 11 .

Furthermore, the end surface of the large valve port 11 is a sealing plane 111 , and in the closed state, one end of the large valve needle portion 21 abuts against the sealing plane 111 . By setting the end surface of the large valve port 11 as a sealing plane 111, when the electronic expansion valve is in a closed state, it is convenient for one end of the large valve needle part 21 to abut against the sealing plane 111. Compared with the inclined plane sealing method, this The sealing point of this sealing method is easier to determine and control. Therefore, in the case of a balance channel connecting the upper and lower ends of the large valve needle part 21, the sealing point can be controlled so that the pressure areas of the upper and lower ends of the large valve needle part 21 are close to achieve pressure balance between the upper and lower ends. .

Specifically, the large valve needle portion 21 has a limiting cavity 212 and a guide hole 213 that communicate with each other, the limiting cavity 212, the guiding hole 213 and the small valve port 211 are arranged in sequence, and the small valve needle 22 includes a limiting rod 221 and a The blocking rod 222 and the limiting rod 221 are axially movably arranged in the limiting cavity 212 , the blocking rod 222 passes through the guide hole 213 , and the driving assembly 23 is drivingly connected to the limiting rod 221 . With the above arrangement, the driving assembly 23 drives the limit rod 221 to move axially, and the limit rod 221 drives the blocking rod 222 to move axially, that is, the blocking rod 222 can adjust the opening of the small valve port 211, and then Realized the function of small flow regulation.

Wherein, the axial limit cavity 212 of the valve needle component 20 has a first stop surface 2121 and a second stop surface 2122 opposite to each other, and one side of the limit rod 221 is matched with the first stop surface 2121; The valve needle 22 also includes a stop shoulder 223 disposed on the side wall of the limit rod 221 , and the stop shoulder 223 and the second stop surface 2122 stop and cooperate with each other. By setting the first stop surface 2121, when the stop rod 221 moves to the side close to the small valve port 211, it can play the role of limit; set the stop shoulder 223 and the second stop surface 2122 to stop When the stop rod 221 moves to the side away from the small valve port 211 , it can play a limiting role, thereby limiting the movement range of the stop rod 221 .

Further, the valve needle component 20 also includes a first elastic member 12 , and two ends of the first elastic member 12 abut against the first stop surface 2121 and the stop shoulder 223 respectively. The two ends of the first elastic member 12 are respectively arranged to abut against the first stop surface 2121 and the stop shoulder 223, so that when the electronic expansion valve is in the closed state, the first elastic member 12 is in a compressed state, and when the drive assembly 23 drives the limit rod 221 to move toward the side away from the small valve port 211, that is, when the flow rate is adjusted, the elastic force of the first elastic member 12 is released at this time, thereby driving the stopper shoulder 223 to move away from the small valve port 211 One side of the valve moves, thereby opening the small valve port 211.

In this embodiment, the outer diameter of the limit rod 221 is larger than the outer diameter of the blocking rod 222 , the first elastic member 12 is a spring sleeved on the limit rod 221 , and the stop shoulder 223 is a ring structure. The outer diameter of the limiting rod 221 is set to be larger than the outer diameter of the blocking rod 222, so that the limiting rod 221 can play a position-limiting effect; the first elastic member 12 is set as a spring sleeved on the limiting rod 221, The strength is high and the cost is low; the stopper shoulder 223 is set as an annular structure, which is convenient for cooperating with the spring.

Specifically, 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 valve needle 22, the screw 231 and the connecting sleeve 232 are axially limited, and the screw 231 can Arranged to move axially, the screw rod 231 can drive the small valve needle 22 to move independently within a predetermined stroke, and the screw rod 231 can drive the large valve needle portion 21 to move through the small valve needle 22 . With the above-mentioned setting method, the screw rod 231 and the connecting sleeve 232 are limited in the axial direction, and one end of the connecting sleeve 232 is connected to the small valve needle 22, so that when the screw rod 231 moves in the axial direction, it can drive the connecting sleeve 232 to move axially. , and then the connecting sleeve 232 drives the small valve needle 22 to move axially.

Wherein, the large valve needle part 21 has an avoidance opening, the connecting sleeve 232 passes through the avoiding opening, and the end of the small valve needle 22 away from the small valve opening 211 penetrates the connecting sleeve 232 and is fixedly connected with the connecting sleeve 232 . By setting the avoidance port, the end of the small valve needle 22 away from the small valve port 211 is fixedly connected to the connection sleeve 232; wherein, the fixed connection method is welding, which is reliable and stable.

As shown in Figure 2, the driving assembly 23 also includes a bearing 233, a bushing 234 and a second elastic member 235 arranged in the connecting sleeve 232, the bearing 233 is sleeved on one end of the screw 231, and one side of the bearing 233 is connected to the connecting sleeve 232. Axial limited fit, the other side of the bearing 233, the bushing 234, the second elastic member 235 and the small valve needle 22 abut in sequence. By putting the bearing 233 on one end of the screw rod 231, and one side of the bearing 233 and the connecting sleeve 232 are limited in the axial direction, this can not only limit the position of the bearing 233, but also ensure that when the screw rod 231 is rotating, it is prevented from being connected. The sleeve 232 also rotates, further avoiding the rotation of the small valve needle 22; the other side of the bearing 233, the bushing 234, the second elastic member 235 and the small valve needle 22 are sequentially abutted against each other, wherein the bushing 234 is set, both can The second elastic member 235 is avoided from directly abutting against the bearing 233, and it can also play a guiding role; the second elastic member 235 is provided, and when the electronic expansion valve is in a closed state, the second elastic member 235 is in a compressed state, and when the screw When 231 moves to the side away from the small valve port 211, that is, in the state of flow regulation, the elastic force of the second elastic member 235 is released, driving the bushing 234 to move to the side away from the small valve port 211, thereby realizing The precise control of the opening of the small valve port 211 further improves the control accuracy of small flow regulation. Wherein, the second elastic member 235 may adopt a spring.

Specifically, the valve seat part 10 has a flow hole 13, and the large valve needle part 21 has a side opening 214, and the side opening 214 is located on the side of the small valve port 211 away from the large valve port 11; The hole 13, the side opening 214, the small valve port 211 and the large valve port 11 communicate in sequence. By setting the flow hole 13 and the side opening 214, when the flow rate is adjusted, the flow hole 13, the side opening 214, the small valve port 211 and the large valve port 11 can realize sequential communication.

Optionally, the large valve needle portion 21 includes a main body, a small valve seat and a limiting structure, the small valve seat is arranged in the cavity of the main body, the small valve seat has a small valve port 211 provided with a flow regulating surface, and the small valve needle 22 is movably arranged in the main body, and the small valve needle 22 cooperates with the small valve seat to adjust the opening of the small valve port 211; Setting a small valve seat is conducive to more precise machining of the flow regulating surface. More preferably, the small valve seat can use a gasket to form a soft seal.

Further, the valve seat part 10 includes a valve seat main body 14, a large sealing gasket 15, a first outer sealing ring 16 and a second outer sealing ring 17, the large sealing gasket 15 is located in the cavity of the valve seat main body 14, and the large sealing gasket 15 has The large valve port 11, the valve seat main body 14 has a flow hole 13, the first outer sealing ring 16 and the second outer sealing ring 17 are sleeved on the outer wall of the valve seat main body 14, and the flow hole 13 is located between the first outer sealing ring 16 and the second outer sealing ring. Between the two outer sealing rings 17. By placing the large sealing gasket 15 in the cavity of the valve seat main body 14 and the large valve port 11 in the large sealing gasket 15, the large valve port 11 has a better sealing effect when it is closed to prevent fluid leakage; the first outer seal is set The ring 16 and the second outer sealing ring 17 facilitate the sealing connection between the valve seat part 10 of the electronic expansion valve and the external matching structure, and avoid the leakage of the flow hole 13 .

As shown in Figures 5 to 7, the plugging rod 222 is cylindrical, and the plugging rod 222 is used to cooperate with the inner wall of the small valve port 211 to adjust the opening of the small valve port 211; One end of the valve port 211 has a rounded corner 2221. When the plugging rod 222 blocks the small valve port 211, the contact position between the plugging 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 rounded corner 2221. superior.

With this solution, the plugging rod 222 is set in a cylindrical shape, and the end of the plugging rod 222 facing the small valve port 211 has a rounded corner 2221. When the plugging rod 222 blocks the small valve port 211, the plugging rod 222 The contact position with the inner wall of the small valve port 211 is formed Ring-shaped sealing line, the sealing line is located on the rounded corner 2221, so set, when the small valve port 211 is blocked by the sealing rod 222, when the small valve port 211 enters the air, the force direction of the sealing rod 222 is In the direction away from the small valve port 211, the magnitude of the force is the product of the pressure at the air inlet and the area difference between the outer diameter of the sealing rod 222 and the diameter of the sealing line. 222 is set as a cylinder, and the sealing line is located on the fillet of the sealing rod 222, that is, in order to reduce the area difference between the outer diameter of the sealing rod 222 and the diameter of the sealing line as much as possible, so that the sealing rod 222 is subjected to The force is as small as possible, thereby optimizing the problem of poor valve closing of the electronic expansion valve. The electronic expansion valve can be installed on the installation base or in the valve body.

Wherein, the radius of the fillet 2221 is R, and R≤1mm. Limiting the radius R of the fillet 2221 within the above range not only facilitates the sealing of the small valve port 211, but also reduces the area difference between the outer diameter of the sealing rod 222 and the diameter of the sealing line as small as possible, so that The force experienced by the blocking rod 222 is as small as possible, thereby optimizing the problem of poor closing of the electronic expansion valve. As shown in FIG. 7 , the area surrounding the outer diameter of the blocking rod 222 is S5 , the area surrounding the sealing line is S6 , and the sealing line is located in the fillet 2221 .

As shown in FIG. 5 , the valve needle component 20 further includes a sealing ring 24 , the sealing ring 24 is arranged in the large valve needle portion 21 , and the blocking rod 222 passes through the sealing ring 24 . The sealing ring 24 is arranged in the large valve needle portion 21, and the sealing rod 222 passes through the sealing ring 24, so that the sealing rod 222 can be sealed and fluid leakage is avoided.

Specifically, the large valve needle portion 21 includes a large valve needle 215 and a small gasket 216 disposed inside the large valve needle 215, the small gasket 216 has a small valve port 211, and the small gasket 216 is made of soft material. By arranging the small gasket 216 in the large valve needle 215, the small valve port 211 can be sealed to avoid fluid leakage. And the small sealing pad 216 is made of soft material to improve the sealing effect, specifically, the material of the small sealing pad 216 can be plastic or rubber.

As shown in Figures 8 to 13, further, the electronic expansion valve further includes: a valve sleeve 30, which is connected to the valve seat part 10; The component 23 is located in the area between the structure in the valve sleeve 30 and the inner wall of the valve sleeve 30 to form a rotor cavity 50, and the driving component 23 is connected to the small valve needle 22 in a driving manner; the balance channel 60 connects the rotor cavity 50 and the small valve port 211 connected.

With this solution, the rotor cavity 50 and the small valve port 211 are connected by setting the balance channel 60. When the electronic expansion valve is working, the pressure of the small valve port 211 and the pressure in the rotor cavity 50 can always be kept consistent, ensuring The interior of the electronic expansion valve can achieve the best balance effect, thereby avoiding the problem of poor valve closing caused by a large pressure difference between the rotor cavity 50 and the small valve port 211 . In this solution, the driving assembly 23 drives the small valve needle 22 to move, and the opening of the small valve port 211 is adjusted through the movement of the small valve needle 22, thereby realizing the function of flow regulation. The electronic expansion valve can be installed on the installation base or in the valve body.

Wherein, the valve seat part 10 includes a valve seat ring 18 and a valve seat body 14, and the valve sleeve 30, the valve seat ring 18 and the valve seat body 14 are sequentially connected; the driving assembly 23 includes a nut structure 41, and the nut structure 41 is located in the valve sleeve 30, The region between the nut structure 41 and the inner wall of the valve sleeve 30 forms a rotor chamber 50 . With the above arrangement, the nut structure 41 is arranged 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 cavity 50 .

Optionally, the electronic expansion valve further includes a rotor part, which is arranged in the valve sleeve 30 , and is used to drive the screw assembly 42 to rotate, and there is a gap between the rotor part and the inner wall of the valve sleeve 30 .

Further, the balance passage 60 includes a first passage 61, a second passage 62, a third passage 63 and a fourth passage 64 connected in sequence, wherein the first passage 61 is located in the nut structure 41, and the second passage 62 is located in the valve seat ring. 18 , the third channel 63 is located in the screw assembly 42 , and the fourth channel 64 is located in the small valve needle 22 . The first passage 61 is arranged in the nut structure 41, the second passage 62 is arranged in the valve seat ring 18, the third passage 63 is arranged in the screw assembly 42, and the fourth passage 64 is arranged in the small valve needle 22, thus realizing In order to connect the rotor chamber 50 and the small valve port 211 through the balance passage 60, the problem of poor valve closing caused by a large pressure difference between the rotor chamber 50 and the small valve port 211 is avoided.

Wherein, the nut structure 41 includes a nut body 411 and a connecting plate 412, the connecting plate 412 is sleeved on the nut body 411, the connecting plate 412 is welded to the valve seat ring 18, and the opening or groove 4121 on the connecting plate 412 forms a first channel 61. The connecting plate 412 and the valve seat ring 18 are connected by welding, which is stable and reliable; the openings or slots 4121 on the connecting plate 412 can form the first channel 61, thereby realizing the rotor chamber 50 and the first channel 61 connectivity.

In this embodiment, the valve seat ring 18 has a guide cavity 181 and a first through hole 182, the inner wall of the guide cavity 181 has an annular groove 1111, a part of the large valve needle part 21 is located in the guide cavity 181, and the first through hole 182 In communication with the annular groove 1111 , the first through hole 182 and the annular groove 1111 form the second channel 62 . By setting the guide cavity 181, it is convenient to set a part of the large valve needle part 21 in the guide cavity 181; the first through hole 182 is communicated with the annular groove 1111, and since the first passage 61 and the second passage 62 are communicated, the rotor The pressure in the cavity 50 and the pressure in the annular groove 1111 can be kept the same. Wherein, the annular groove 1111 communicates with the third channel 63 . Alternatively, the seat ring 18 has a guide cavity 181 and a first through hole 182 , a part of the large valve needle portion 21 is located in the guide cavity 181 , and the first through hole 182 forms the second channel 62 .

Specifically, the screw rod 231 is screwed to the nut structure 41, the connecting sleeve 232 is connected to the small valve needle 22, the fourth channel 64 communicates with the cavity in the connecting sleeve 232, the side wall of the connecting sleeve 232 has a second through hole 4221, and the second through hole 4221 is formed on the side wall of the connecting sleeve 232. The second through hole 4221 forms the third channel 63 . Using the above arrangement, the connection sleeve 232 is connected to the small valve needle 22, and the fourth passage 64 communicates with the cavity in the connection sleeve 232, which can ensure that the pressure of the cavity in the connection sleeve 232 is the same as that of the fourth passage 64, because The setting of the second through hole 4221 makes the pressure in the connecting sleeve 232 and the pressure in the annular groove 1111 the same, so the pressure in the rotor cavity 50 and the pressure in the fourth channel 64 can be kept the same. Wherein, the screw assembly 42 includes a screw 231 and a connecting sleeve 232 .

In this embodiment, the limit rod 221 is matched with the large valve needle part 21 in the axial direction, and the blocking rod 222 is used to cooperate with the small valve port 211. There is a third through hole 3211 inside the limit rod 221 for blocking The rod 222 has a fourth through hole 3221 inside, and the third through hole 3211 and the third through hole 3211 form the fourth channel 64 . The outer diameter of the limiting rod 221 is set to be larger than the outer diameter of the blocking rod 222, and the limiting rod 221 and the large valve needle part 21 cooperate in the axial stop, so that the small valve needle 22 can be limited. Thereby, the moving range of the small valve needle 22 is limited; since the third through hole 3211 communicates with the fourth through hole 3221, and the fourth through hole 3221 communicates with the small valve port 211, the pressure in the rotor chamber 50 and the small valve port The pressure inside 211 can be kept the same, so that the rotor chamber 50 and the small valve port 211 are communicated through the balance channel 60 .

In this embodiment, the valve needle part 20 further includes a second inner sealing ring 34 , and the second inner sealing ring 34 is located between the outer wall of the large valve needle part 21 and the inner wall of the valve seat part 10 . The second inner sealing ring 34 is provided to ensure the tightness between the outer wall of the large valve needle portion 21 and the inner wall of the valve seat member 10 .

As shown in Figures 14 to 16, the electronic expansion valve further includes: a large sealing gasket 15, which is arranged in the valve seat part 10, and the large sealing gasket 15 has a large valve port 11; the large valve needle 215 includes an interconnected main structure 31 and Blocking sleeve 32, the end of blocking sleeve 32 It is used to cooperate with the large sealing gasket 15 to open and close the large valve port 11. The main structure 31 is in sealing fit with the inner wall of the valve seat part 10. The radial cross-sectional area of the outer peripheral surface of the main structure 31 is S3; the sealing sleeve 32 and the large sealing When the gasket 15 abuts, a contact surface around the large valve port 11 is formed between the sealing sleeve 32 and the large sealing gasket 15, 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, wherein , S1<S3<S2.

In this solution, the rotor cavity 50 is communicated with the small valve port 211 through the balance passage 60, so that the fluid pressure on both sides of the valve needle member 20 is the same, that is, the fluid pressure in the large valve port 11, so that at the large valve port 11 is closed, when the fluid flow direction of the electronic expansion valve is from the cavity of the valve seat part 10 to the large valve port 11, the fluid pressure is P1, and the fluid pressure received by the valve needle part 20 is P1 (S2-S3), And the force 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 cavity of the valve seat part 10, the fluid pressure is P2, and the fluid pressure on the valve needle part 20 is P2 (S3- S1), and the force direction is the valve closing direction. Therefore, through the above scheme, no matter what the flow direction of the fluid in the electronic expansion valve is, when the large valve port 11 is closed, the force exerted by the fluid on the valve needle member 20 is in the direction of closing the valve, thus ensuring the electronic expansion valve’s stability when the valve is closed. Reliability, avoid internal leakage. The electronic expansion valve can be installed on the installation base or in the valve body.

In this embodiment, the large sealing gasket 15 is made of soft material, and the end surface of the large sealing gasket 15 fits with the end of the sealing sleeve 32 . In this way, when the sealing sleeve 32 presses against the large sealing gasket 15, a pit will be formed on the large sealing gasket 15, thereby increasing the area of the contact surface and improving the sealing effect.

Wherein, the end surface of the sealing sleeve 32 facing the large sealing gasket 15 is an arc-shaped surface 321 , and the contact surface is located in the arc-shaped surface 321 . The end surface of the sealing sleeve 32 facing the large sealing gasket 15 is set as an arc-shaped surface 321, which can make the large sealing gasket 15 more easily deformed and increase the area of the contact surface when the valve is closed. Optionally, on the section passing through the axis of the sealing sleeve 32, the arc-shaped surface 321 is divided into symmetrical arcs by the extension line of the outer wall of the main structure 31, so as to ensure that a part of the contact surface is located in the outer peripheral surface of the main structure 31, The other part is located outside the outer peripheral surface of the main structure 31, so as to ensure that S1<S3<S2, and improve the reliability of valve closing.

Further, the main structure 31 and the sealing sleeve 32 are cylindrical structures, the main structure 31, the sealing sleeve 32 and the large valve port 11 are arranged coaxially, the outer diameter of the main structure 31 is D3, and the outer diameter of the sealing sleeve 32 is is D2, and the inner diameter of the sealing sleeve 32 is D1, wherein, D1<D3<D2.

Specifically, in FIG. 14 , the area formed around the outer periphery of the sealing sleeve 32 is S4. In use, when the fluid of the electronic expansion valve flows from the cavity of the valve seat part 10 to the large valve port 11, the The pressure of the valve port 11 is lower than P1, which can be considered as an atmospheric environment. The upward pressure of P1 on the valve needle part 20 is the force exerted by P1 on the gap between the lower end surface of the sealing sleeve 32 and the large sealing gasket 15, which is P1 (S4-S2), the downward pressure of P1 on the valve needle part 20 is the force exerted by P1 on the upper end surface of the sealing sleeve 32, that is, P1 (S4-S3), since S3<S2, the upward force and the downward force The resultant force of the downward force is downward P1 (S2-S3), so that the direction of the resultant force is consistent with the valve closing direction, which ensures the reliability of valve closing. When the fluid of the electronic expansion valve flows from the large valve port 11 to the cavity of the valve seat part 10, the pressure in the cavity of the valve seat part 10 is less than P1, which can be considered as communicating with the external atmosphere, and the valve needle part 20 is subjected to P2 The upward pressure is P2S1, the downward pressure on the needle member 20 is equal to P2, and the downward pressure is P2S3. Since S1<S3, the resultant force of the two is downward P2 (S3-S1), so the direction of the resultant force It is consistent with the valve closing direction, which ensures the reliability of valve closing.

Through the above design, regardless of whether the electronic expansion valve enters gas or liquid in the horizontal direction or vertical direction, the force direction of the sealing sleeve 32 and the valve closing direction are always consistent, so it can avoid the failure of the valve caused by too high fluid pressure. The problem of failure due to closed dead, improves the valve closing reliability of the electronic expansion valve.

As shown in FIG. 15 , the main structure 31 includes a first sleeve body 312 and a second sleeve body 313 connected to each other, wherein the second sleeve body 313 and the sealing sleeve 32 are integrally structured, and the valve seat component 10 includes interconnected valves. The seat ring 18 and the valve seat body 14, the large sealing gasket 15 are located in the valve seat body 14, the first sleeve body 312 is located in the valve seat ring 18, and the first sleeve body 312 and the valve seat ring 18 are tightly matched. By setting the main structure 31 as a separate structure, it is convenient for processing and assembly. Setting the second sleeve body 313 and the sealing sleeve 32 into an integrated structure can improve the structural strength. Optionally, the flow hole 13 is located on the valve seat body 14 instead of the valve seat ring 18 , which can shorten the length of the valve seat ring 18 , simplify the structure of the valve seat ring 18 and facilitate the processing of the valve seat ring 18 .

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, there may be various modifications and changes in the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims (28)

1. An electronic expansion valve, characterized in that it comprises:

   a valve seat part (10), said valve seat part (10) having a large valve port (11);

   The valve needle part (20) is arranged in the cavity of the valve seat part (10), and the valve needle part (20) includes a large valve needle part (21), a small valve needle (22) and a drive assembly (23) , the large valve needle portion (21) has a small valve port (211), the small valve port (211) has a flow regulating surface, and the end of the small valve port (211) with a large opening is away from the large valve port ( 11), the drive assembly (23) is driven and connected to the small valve needle (22) and the large valve needle part (21);

   The electronic expansion valve has a closed state, a flow regulation state and a fully open state; wherein, in the closed state, the small valve needle (22) is inserted into the small valve port (211) to block the small valve port (211), the large valve needle portion (21) blocks the large valve port (11); in the flow adjustment state, the large valve needle portion (21) blocks the large valve port ( 11), the small valve needle (22) is axially movable to adjust the opening degree of the small valve port (211); in the fully open state, the large valve needle part (21) avoids the Describe the large valve port (11).
2. The electronic expansion valve according to claim 1, characterized in that the flow regulating surface is a conical surface, and in the closed state, the small valve needle (22) abuts against the small valve port (211) and/or, the end face of the large valve port (11) is a sealing plane (111), and in the closed state, one end of the large valve needle portion (21) abuts against the sealing plane (111) .
3. The electronic expansion valve according to claim 1, characterized in that, the large valve needle portion (21) has a limiting cavity (212) and a guide hole (213) communicating with each other, the limiting cavity (212), The guide hole (213) and the small valve port (211) are arranged in sequence, and the small valve needle (22) includes a limit rod (221) and a blocking rod (222) connected to each other, and the limit rod (221) is axially movably arranged in the limiting cavity (212), the blocking rod (222) passes through the guide hole (213), the driving assembly (23) and the limiting The rod (221) drives the connection.
4. The electronic expansion valve according to claim 3, characterized in that, in the axial direction of the needle member (20), the limiting chamber (212) has a first opposing stop surface (2121) and a second stop surface Blocking surface (2122), one side of the limit rod (221) and the first stop surface (2121) stop and cooperate; the small valve needle (22) also includes a set on the limit rod ( 221) The stop shoulder (223) on the side wall, the stop shoulder (223) and the second stop surface (2122) stop and cooperate.
5. The electronic expansion valve according to claim 4, characterized in that, the valve needle part (20) further comprises a first elastic member (12), and the two ends of the first elastic member (12) are connected to the first elastic member respectively. A stop surface (2121) abuts against the stop shoulder (223).
6. The electronic expansion valve according to claim 5, characterized in that, the outer diameter of the limiting rod (221) is larger than the outer diameter of the blocking rod (222), and the first elastic member (12) is a sleeve The spring arranged on the limit rod (221), the stop shoulder (223) is an annular structure.
7. The electronic expansion valve according to claim 3, characterized in that, the drive assembly (23) includes a screw assembly (42), and the screw assembly (42) includes a screw (231) and a connecting sleeve (232), the One end of the connection sleeve (232) and the The small valve needle (22) is connected, the screw rod (231) and the connecting sleeve (232) are limited in the axial direction, the screw rod (231) is axially movable, and the screw rod (231) can be The small valve needle (22) is driven to move independently within a preset stroke, and the screw rod (231) can drive the large valve needle part (21) to move through the small valve needle (22).
8. The electronic expansion valve according to claim 7, characterized in that, the large valve needle part (21) has an escape opening, the connecting sleeve (232) passes through the escape opening, and the small valve needle (22) The end away from the small valve port (211) passes through the connecting sleeve (232) and is fixedly connected with the connecting sleeve (232).
9. The electronic expansion valve according to claim 7, characterized in that, the drive assembly (23) further comprises a bearing (233), a bush (234) and a second elastic member arranged in the connecting sleeve (232) (235), the bearing (233) is sleeved on one end of the screw (231), and one side of the bearing (233) is fitted with the connecting sleeve (232) in an axial limit, and the bearing (233 ), the bush (234), the second elastic member (235) and the small valve needle (22) abut in sequence.
10. The electronic expansion valve according to claim 1, characterized in that, the valve seat member (10) has a flow hole (13), the large valve needle part (21) has a side opening (214), and the side The opening (214) is located on the side of the small valve port (211) away from the large valve port (11); wherein, in the flow adjustment state, the flow hole (13), the side opening (214), the small valve port (211) and the large valve port (11) are connected in sequence.
11. The electronic expansion valve according to claim 10, characterized in that, the valve seat part (10) comprises a valve seat body (14), a large sealing gasket (15), a first outer sealing ring (16) and a second outer sealing ring (16). A sealing ring (17), the large sealing pad (15) is located in the cavity of the valve seat main body (14), the large sealing pad (15) has the large valve port (11), and the valve seat main body (14) has the flow hole (13), the first outer sealing ring (16) and the second outer sealing ring (17) are sleeved on the outer wall of the valve seat body (14), the The flow hole (13) is located between the first outer sealing ring (16) and the second outer sealing ring (17).
12. The electronic expansion valve according to claim 7, characterized in that,

    The plugging rod (222) is cylindrical, and the plugging rod (222) is used to cooperate with the inner wall of the small valve port (211) to adjust the opening of the small valve port (211);

    Wherein, the end of the plugging rod (222) facing the small valve port (211) has a rounded corner (2221), when the plugging rod (222) blocks the small valve port (211), The abutment position between the blocking rod (222) and the inner wall of the small valve port (211) forms an annular sealing line, and the sealing line is located on the rounded corner (2221).
13. The electronic expansion valve according to claim 12, characterized in that, the radius of the fillet (2221) is R, and R≤1mm.
14. The electronic expansion valve according to claim 12, characterized in that, the valve needle part (20) further comprises a sealing ring (24), and the sealing ring (24) is arranged in the large valve needle part (21) , the blocking rod (222) passes through the sealing ring (24).
15. The electronic expansion valve according to claim 12, characterized in that, the large valve needle part (21) comprises a large valve needle (215) and a small gasket (216) arranged inside the large valve needle (215) , the small sealing pad (216) has the small valve port (211), and the small sealing pad (216) is made of soft material.
16. The electronic expansion valve according to claim 7, wherein the electronic expansion valve further comprises:

    A valve sleeve (30), the valve sleeve (30) is connected to the valve seat part (10);

    The drive assembly (23) is arranged in the cavity of the valve seat part (10) and the valve sleeve (30), and the structure of the drive assembly (23) located in the valve sleeve (30) and the The area between the inner walls of the valve sleeve (30) forms the rotor cavity (50);

    A balance passage (60), the balance passage (60) communicates the rotor cavity (50) with the small valve port (211).
17. The electronic expansion valve according to claim 16, characterized in that, the valve seat part (10) comprises a valve seat ring (18) and a valve seat body (14), the valve sleeve (30), the valve seat The ring (18) and the valve seat main body (14) are sequentially connected; the driving assembly (23) includes a nut structure (41), and the nut structure (41) is located in the valve sleeve (30), and the nut The region between the structure (41) and the inner wall of the valve sleeve (30) forms the rotor chamber (50).
18. The electronic expansion valve according to claim 17, characterized in that, the balance channel (60) includes a first channel (61), a second channel (62), a third channel (63) and a fourth channel connected in sequence (64), wherein the first channel (61) is located in the nut structure (41), the second channel (62) is located in the seat ring (18), and the third channel (63 ) is located in the screw assembly (42), and the fourth channel (64) is located in the small valve needle (22).
19. The electronic expansion valve according to claim 18, characterized in that, the nut structure (41) includes a nut body (411) and a connecting plate (412), and the connecting plate (412) is sleeved on the nut body ( 411), the connecting plate (412) and the valve seat ring (18) are welded, and the opening or groove (4121) on the connecting plate (412) forms the first channel (61).
20. The electronic expansion valve according to claim 18, characterized in that,

    The 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), the large valve needle part (21) A part is located in the guide cavity (181), the first through hole (182) communicates with the annular groove (1111), and the first through hole (182) and the annular groove (1111) form the the second channel (62); or,

    The seat ring (18) has a guide cavity (181) and a first through hole (182), a part of the large valve needle part (21) is located in the guide cavity (181), and the first through hole Holes (182) form said second channel (62).
21. The electronic expansion valve according to claim 18, characterized in that, the screw rod (231) is threadedly connected to the nut structure (41), the connecting sleeve (232) is connected to the small valve needle (22), The fourth channel (64) and the connected The cavities in the connecting sleeve (232) are connected, and the side wall of the connecting sleeve (232) has a second through hole (4221), and the second through hole (4221) forms the third channel (63).
22. The electronic expansion valve according to claim 18, characterized in that, the limit rod (221) cooperates with the large valve needle portion (21) in an axial stop, and the blocking rod (222) is used for Cooperating with the small valve port (211), the limiting rod (221) has a third through hole (3211), the blocking rod (222) has a fourth through hole (3221), and the first The third through hole (3211) and the fourth through hole (3221) form the fourth channel (64).
23. The electronic expansion valve according to claim 16, characterized in that, the valve needle part (20) further comprises a second inner sealing ring (34), and the second inner sealing ring (34) is located on the large valve needle Between the outer wall of the part (21) and the inner wall of the valve seat part (10).
24. The electronic expansion valve according to claim 15, wherein the electronic expansion valve further comprises:

    a large sealing pad (15), arranged in the valve seat part (10), the large sealing pad (15) having the large valve port (11);

    The large valve needle (215) includes an interconnected main structure (31) and a sealing sleeve (32), and the end of the sealing sleeve (32) is used to cooperate with the large sealing gasket (15) to open Close the large valve port (11), the main structure (31) is in sealing fit with the inner wall of the valve seat part (10), and the radial cross-sectional area of the outer peripheral surface of the main structure (31) is S3;

    When the sealing sleeve (32) and the large sealing gasket (15) abut against each other, a circle around the large valve port (15) is formed between the sealing sleeve (32) and the large sealing gasket (15). 11), the area of the outer periphery of the contact surface is S2, and the area of the inner periphery of the contact surface is S1, wherein S1<S3<S2.
25. The electronic expansion valve according to claim 24, characterized in that, the large sealing gasket (15) is made of soft material, and the end face of the large sealing gasket (15) and the sealing sleeve (32) End fit.
26. The electronic expansion valve according to claim 25, characterized in that, the end surface of the sealing sleeve (32) facing the large sealing gasket (15) is an arc surface (321), and the contact surface is located at the arc surface. Inside the shape surface (321).
27. The electronic expansion valve according to claim 24, characterized in that, the main structure (31) and the sealing sleeve (32) are cylindrical structures, and the main structure (31), the sealing sleeve (32) is arranged coaxially with the large valve port (11), the outer diameter of the main body structure (31) is D3, the outer diameter of the sealing sleeve (32) is D2, and the sealing sleeve (32) ) is D1, wherein, D1<D3<D2.
28. The electronic expansion valve according to claim 24, characterized in that, the main structure (31) comprises a first sleeve (312) and a second sleeve (313) connected to each other, wherein the second sleeve (313) and the sealing sleeve (32) are integrally structured, the valve seat part (10) includes a valve seat ring (18) and a valve seat main body (14) connected to each other, and the large sealing gasket (15) Located in the valve seat body (14), the first sleeve (312) is located in the valve seat ring (18), and the first sleeve (312) and the valve seat ring (18) are sealed Cooperate.