CN221723438U

CN221723438U - Rotary direct-drive switch valve

Info

Publication number: CN221723438U
Application number: CN202420349772.5U
Authority: CN
Inventors: 蔺级申; 马赫; 张攸长
Original assignee: Sanuo Power Shenzhen Co ltd
Current assignee: Sanuo Power Shenzhen Co ltd
Priority date: 2024-02-23
Filing date: 2024-02-23
Publication date: 2024-09-17
Anticipated expiration: 2034-02-23

Abstract

The application relates to a rotary direct-drive switch valve, which relates to the technical field of control valves and comprises the following components: valve body, valve core and driver; the valve core is rotatably arranged in the valve body; the driver is connected with the valve core and can drive the valve core to rotate; a valve cavity is formed in the valve body; the two sides of the valve body are respectively provided with a valve body oil inlet and a valve body oil outlet, and the valve body oil inlet and the valve body oil outlet are communicated with the valve body cavity; a driving end cover and a closed end cover are respectively arranged at two ends of the valve body; a valve core cavity is arranged in the valve core; the diameter of the middle part of the valve core cavity is larger than that of the end part; two sides of the valve core are respectively provided with a valve core oil inlet and a valve core oil outlet, valve core oil inlet and valve core the oil outlet is communicated with the valve core cavity. According to the application, the 3D printing light valve core is driven by the high-torque motor, so that the raw materials are obviously reduced, the quality of the valve core is reduced, the valve core has smaller inertia, the response speed and the reliability are improved, and the production cost is reduced on the basis of ensuring the mechanical strength.

Description

Rotary direct-drive switch valve

Technical Field

The application relates to the technical field of control valves, in particular to a rotary direct-drive switch valve.

Background

The control valve consists of two main assemblies: valve body assemblies and actuator assemblies (or actuator systems), control valves are divided into four major families: single seat series control valves, double seat series control valves, sleeve series control valves, and self-actuated series control valves. Variations of the four types of valves can lead to many different applicable configurations and are widely used.

The switch valve is a control valve with only two states of on and off, and has the main function of controlling the connection and disconnection of fluid, and is widely applied to occasions needing frequent switching. According to the difference of the pushing force, the pneumatic switch valve and the electric switch valve are generally classified.

The valve core of the existing electric switch valve is manufactured by adopting a traditional process, the switch valve manufactured by the method has heavy weight, more raw materials are used, the volume is larger, the action response speed is general, and the switch action time is long.

Disclosure of utility model

The application provides a rotary direct-drive switch valve, which aims to solve the problems of heavy valve core weight, slow action response speed and long switch action time of the existing electric switch valve.

The application provides a rotary direct-drive switch valve which adopts the following technical scheme:

A rotary direct-drive switching valve comprising: valve body, valve core and driver; the valve core is rotatably arranged in the valve body; the driver is connected with the valve core and can drive the valve core to rotate; a valve cavity is formed in the valve body; the two sides of the valve body are respectively provided with a valve body oil inlet and a valve body oil outlet, and the valve body oil inlet and the valve body oil outlet are communicated with the valve body cavity; a driving end cover and a closed end cover are respectively arranged at two ends of the valve body; a valve core cavity is arranged in the valve core; the diameter of the middle part of the valve core cavity is larger than that of the end part; the two sides of the valve core are respectively provided with a valve core oil inlet and a valve core oil outlet, and the valve core oil inlet and the valve core oil outlet are communicated with the valve core cavity; the valve core oil inlet can be communicated or staggered with the valve body oil inlet, and the valve core oil outlet can be communicated or staggered with the valve body oil outlet.

By adopting the technical scheme, the valve core is driven by the driver to rotate in the valve body, so that the valve core oil inlet and the valve core oil outlet on the valve core are respectively opposite to or staggered with the valve body oil inlet and the valve body oil outlet of the valve body, thereby realizing the function of rapidly and accurately controlling the on-off of the on-off valve, improving the response speed of the on-off valve and ensuring the reliable execution of the on-off valve. The diameter of the middle part of the valve core cavity is larger than that of the end part, so that the manufactured valve core is light, the use of raw materials can be greatly reduced, the cost is reduced, the weight is light, and the valve core can respond quickly.

In a specific implementation mode, the oil inlet of the valve body and the oil outlet of the valve body are connected with connecting pipes, and connecting components are arranged on the connecting pipes and used for connecting external pipelines.

Through adopting above-mentioned technical scheme, utilize the setting of connecting pipe and coupling assembling, can be with the convenient, the reliable connection of ooff valve with outside pipeline, fluid flows in or flows out the ooff valve through connecting pipe and coupling assembling, has guaranteed the reliable access and the outflow of fluid.

In a specific implementation mode, two ends of the valve core are sleeved with connecting bearings, two ends of the interior of the valve body are provided with bearing mounting cavities, and the bearing mounting cavities are communicated with the valve body cavity; the connecting bearing is positioned in the bearing mounting cavity.

Through adopting above-mentioned technical scheme, utilize the bearing that sets up between valve body and case, can reduce the case and the frictional force that produces between the valve body when the valve body internal rotation case to guaranteed the gyration precision of case, improved pivoted reliability and accuracy.

In a specific embodiment, the bearing mounting cavity is disposed coaxially with the valve body cavity and has a diameter greater than the diameter of the valve body cavity.

Through adopting above-mentioned technical scheme, utilize the bearing installation cavity that sets up with the valve body chamber is coaxial, and the bearing installation cavity diameter is greater than the diameter in valve body chamber, can inject the movable range that the bearing was installed in the bearing installation cavity to inject the movable range of case in the valve body internal rotation, improve case pivoted reliability and stability.

In a specific embodiment, the spool chamber comprises a first chamber, a second chamber, a drive end chamber, and a closed end chamber; the second cavities are arranged at two ends of the first cavity, and the diameter of the second cavities is smaller than that of the first cavity; the driving end cavity and the closed end cavity are respectively communicated with the two second cavities correspondingly and are arranged at two ends of the valve core; the driving end cavity is used for being connected with the driver; the driving end cavity and the closed end cavity are communicated with the valve body cavity.

Through adopting above-mentioned technical scheme, utilize the cavity of different diameter sizes, and the cavity is the trend of diminishing from the centre to both ends, very big reduction the quality and the volume of case, reduced raw and other materials for the case is lighter and possess less inertia, improves the response speed of driver drive case, case.

In a specific implementation mode, a key groove is formed in the inner side wall of the driving end cavity, a transmission key is arranged on a rotating shaft of the servo motor, and the transmission key is matched with the key groove.

Through adopting above-mentioned technical scheme, utilize drive key and keyway looks adaptation, can link together servo motor and case, improved stability and the reliability of being connected between servo motor and the case.

In a specific embodiment, a drain channel is disposed between the second cavity and the driving end cavity, and the diameter of the drain channel is smaller than the diameter of the second cavity and smaller than the diameter of the driving end cavity.

Through adopting above-mentioned technical scheme, utilize the oil drainage passageway, can carry the drive end intracavity with the fluid in first cavity and the second cavity through the oil drainage passageway, flow into the valve body intracavity from the drive end intracavity again, reduced the frictional force that rotation produced between case and the valve body, improved case pivoted reliability and smoothness nature. In addition, the high-pressure environment formed inside the valve core is avoided, and the safety is improved.

In a specific implementation manner, a driving end oil drain hole, a closed end oil drain hole, an oil drain hole and a connecting channel are also arranged in the valve core; the driving end oil drain hole is arranged on the side wall of the driving end of the valve core and extends to be communicated with the oil drain channel; the closed end oil drain hole is arranged on the side wall of the closed end of the valve core and extends to be communicated with the closed end cavity; the oil drain hole is arranged on the side wall of the valve core and extends to be communicated with the first cavity; the projection of the oil drain hole in the horizontal direction is perpendicular to the projection connecting line of the valve core oil outlet and the valve core oil inlet in the horizontal direction; the connecting channel is arranged on the inner side wall of the driving end cavity and is connected between the oil drainage channel and the valve body cavity.

Through adopting above-mentioned technical scheme, utilize drive end oil drain hole and blind end oil drain hole, can be further convenient, carry the fluid in the case to the valve body intracavity fast, further improved case pivoted smoothness nature. The valve core oil inlet and the valve core oil outlet are staggered with the valve body oil inlet and the valve core oil outlet respectively, redundant fluid in the valve body can be discharged by utilizing the oil drain hole, the fluid is prevented from remaining in the valve body, and the service life of the switch valve is prolonged.

In a specific implementation manner, the driver is a servo motor, a fixed flange is arranged at the driving end of the valve body, the servo motor is arranged on the fixed flange, and a rotating shaft of the servo motor is connected with the valve core.

By adopting the technical scheme, the servo motor is utilized to directly control the rotation of the valve core, so that the response speed and the frequency response of the switch valve are improved, and the reliability is improved.

In a specific embodiment, the valve core is an integrally formed structure fabricated using 3D printing techniques.

By adopting the technical scheme, the valve core is manufactured by 3D printing, so that raw materials for manufacturing the valve core can be remarkably reduced, the valve core with light weight and small volume is ensured, and the power density is improved; in addition, in the printing process, the printing processing surface only needs to keep extremely small processing allowance, so that the processing amount is remarkably reduced, and the processing production cost is reduced.

In summary, the present application includes at least one of the following beneficial technical effects:

1. The valve core is driven by the driver to rotate in the valve body, so that the valve core oil inlet and the valve core oil outlet on the valve core are respectively opposite to or staggered with the valve body oil inlet and the valve body oil outlet of the valve body, thereby realizing the function of rapidly and accurately controlling the on-off of the on-off valve, improving the response speed of the on-off valve and ensuring the reliable execution of the on-off valve;

2. Utilize 3D to print the cavity of manufacturing valve core intracavity different diameters size, and the cavity is the trend of diminishing from the centre to both ends, quality and the volume of case that can be very big have been reduced, have reduced raw and other materials to the maximum extent on the basis of guaranteeing mechanical strength for the case is lighter and possess less inertia, improves driver drive case, the response speed of case.

Drawings

FIG. 1 is a schematic diagram of on-off valve communication in an embodiment of the application.

Fig. 2 is a schematic diagram of the opening of the on-off valve in an embodiment of the application.

FIG. 3 is a schematic view of a valve body in an embodiment of the application.

FIG. 4 is a cross-sectional view of a valve body in one embodiment of the application.

FIG. 5 is a schematic illustration of a valve cartridge in an embodiment of the application.

FIG. 6 is a cross-sectional view of a valve cartridge in one embodiment of the application.

Reference numerals illustrate: 1. a valve body; 11. an oil inlet of the valve body; 12. an oil outlet of the valve body; 13. a valve body cavity; 14. a bearing mounting cavity; 15. a drive end cap; 16. closing the end cover; 17. a fixed flange; 2. a valve core; 21. a valve core oil inlet; 22. an oil outlet of the valve core; 23. a spool cavity; 231. a first cavity; 232. a second cavity; 233. a drive end cavity; 234. a closed end cavity; 235. a key slot; 24. a drain passage; 25. an oil drain hole is formed at the driving end; 26. an oil drain hole at the closed end; 27. an oil drain hole; 28. a connection channel; 3. a driver; 31. a transmission key; 4. a connecting pipe; 5. a connection assembly; 6. and connecting the bearings.

Detailed Description

Further details are provided below in conjunction with FIGS. 1-6. It should be understood that the detailed description and specific examples, while indicating and illustrating the application, are not intended to limit the application.

In the present application, unless otherwise stated, the use of the orientation or positional relationship as indicated by "drive end, closed end, horizontal direction" is based on the positional relationship of both ends and the axis of the valve body of the present application. The direction indicated by the driving end refers to the direction of one end of the valve body connected with the driver, the direction indicated by the closed end refers to the direction of the other end of the valve body, and the direction indicated by the horizontal direction refers to the direction perpendicular to the axis of the valve body. The description of the orientation or positional relationship of the valve element and its components of the present application is consistent with the mounting orientation in actual use thereof.

In the description of the present application, it should be noted that, unless explicitly stated and limited otherwise, the terms "disposed" and "connected" should be interpreted broadly, and for example, they may be fixedly connected, detachably connected, or integrally connected; either directly or indirectly via an intermediate medium, or in communication with each other or in interaction with each other. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

One embodiment of the rotary direct-drive switching valve of the present application, as shown in fig. 1, includes: a valve body 1, a valve core 2 and a driver 3. The driver 3 is connected with the valve core 2 and drives the valve core 2 to rotate. The valve core 2 is arranged in the valve body 1 and is in clearance fit with the valve body 1.

As shown in fig. 1, 2, 3 and 4, the valve body 1 is a hollow cylinder, threaded holes are uniformly distributed on the end surfaces of two ends, a driving end cover 15 and a sealing end cover 16 are respectively arranged at two ends of the valve body 1, and screws are respectively arranged on the driving end cover 15 and the sealing end cover 16 and are in threaded connection with the threaded holes. Furthermore, the drive end cap 15 is located on the same side of the valve body 1 as the driver 3. The side surfaces of the driving end cover 15 and the sealing end cover 16, which are abutted against the inner side wall of the valve body 1, are provided with sealing grooves, in other words, the sealing rings are respectively abutted against the driving end cover 15 and the valve body 1, and the sealing end cover 16 and the valve body 1, so that the sealing effect is achieved, and the reliability and the stability of connection are improved.

A valve body cavity 13 is arranged in the valve body 1; both sides of the valve body 1 are respectively provided with a valve body oil inlet 11 and a valve body oil outlet 12, and the valve body oil inlet 11 and the valve body oil outlet 12 are communicated with a valve body cavity 13. The valve body oil inlet 11 and the valve body oil outlet 12 are coaxially arranged, and the axis is perpendicular to the axis of the valve body 1.

The valve body oil inlet 11 and the valve body oil outlet 12 are fixedly connected with a connecting pipe 4, and the connecting pipe 4 is perpendicular to the axis of the valve body 1. The connecting pipe 4 is coaxially and fixedly connected with a connecting component 5, and the connecting component 5 can be connected with an external pipeline. In this embodiment, the connection assembly 5 is a connection flange.

As shown in fig. 1, 2, 5 and 6, the valve core 2 is a cylinder with thin ends and thick middle, and one end of the cylinder is connected with the driver 3. The spool 2 is provided with a spool chamber 23 inside, and the diameter of the middle part of the spool chamber 23 is larger than the diameter of the end part. The two sides of the valve core 2 are respectively provided with a valve core oil inlet 21 and a valve core oil outlet 22, and the valve core oil inlet 21 and the valve core oil outlet 22 are communicated with a valve core cavity 23. The spool oil inlet 21 and the spool oil outlet 22 are coaxially arranged, and the axis is perpendicular to the axis of the spool 2. Under the drive of the driver 3, the valve core 2 rotates in the valve body 1, so that the valve core oil inlet 21 can be opposite to the valve body oil inlet 11, and the valve core oil outlet 22 can be opposite to the valve body oil outlet 12.

Specifically, the spool chamber 23 includes a first chamber 231, a second chamber 232, a drive end chamber 233, and a closed end chamber 234. The second cavity 232 is disposed at both ends of the first cavity 231 and communicates with the first cavity 231, and the diameter of the second cavity 232 is smaller than that of the first cavity 231. The driving end cavity 233 and the closed end cavity 234 are respectively correspondingly communicated with the second cavities 232 at two ends and are respectively arranged at two ends of the interior of the valve core 2. The driving end cavity 233 is located on the same side of the valve core 2 as the driver 3, and the driving end cavity 233 is used for being connected with the driver 3. Both the drive end cavity 233 and the closed end cavity 234 are in communication with the valve body cavity 13.

In this embodiment, the driver 3 selects a servo motor, a transmission key 31 is disposed on a rotation shaft of the servo motor, key grooves 235 are disposed on two side walls of the driving end cavity 233, and the transmission key 31 is adapted to the key grooves 235 and is used for connecting the servo motor with the valve core 2. The driving end on the valve body 1 is fixedly provided with a fixed flange 17, and the servo motor is arranged on the fixed flange 17 through screws. The sealing groove is arranged on one surface of the fixed flange 17, which is abutted against the servo motor, and the sealing ring is arranged in the sealing groove, namely the sealing ring is arranged between the fixed flange 17 and the servo motor, so that the sealing effect is achieved, and the reliability and the stability of connection are improved.

As shown in fig. 2 and 6, the second cavity 232 and the driving end cavity 233 are provided with a drain passage 24 before, and the diameter of the drain passage 24 is smaller than the diameter of the second cavity 232 and also smaller than the diameter of the driving end cavity 233. The valve core 2 is also provided with a driving end oil drain hole 25, a closed end oil drain hole 26, an oil drain hole 27 and a connecting channel 28. The driving end oil drain hole 25 is arranged on the side wall of the driving end of the valve core 2 and extends to be communicated with the oil drain channel 24, namely the oil drain channel 24 is communicated with the valve body cavity 13. The closed end oil drain hole is arranged on the side wall of the closed end of the valve core 2 and is communicated with the closed end cavity 234, namely the closed end cavity 234 is communicated with the valve body cavity 13. The oil drain hole 27 is provided on a side wall of the spool 2 and extends to communicate with the first chamber 231. The projection of the oil drain hole 27 in the horizontal direction is perpendicular to the projection of the axis coaxial with the spool oil inlet port 21 and the spool oil outlet port 22 in the horizontal direction. The connecting channel 28 is arranged on the inner side wall of the driving end cavity 233 and is connected between the oil drain channel 24 and the valve body cavity 13; the bottom of the connecting channel 28 is lower than the bottom of the drive end cavity 233 and is disposed opposite the keyway 235. The connecting passage 28 provides space for fluid communication between the spool chamber 23 and the valve body chamber 13.

The two ends of the outer part of the valve core 2 are sleeved with connecting bearings 6, a bearing mounting cavity 14 is also arranged in the valve body 1, and the bearing mounting cavity 14 is arranged at two ends of the valve body cavity 13 and is coaxial and communicated with the valve body cavity 13; the diameter of the bearing mounting cavity 14 is larger than the diameter of the valve body cavity 13. The connecting bearing 6 is located in the bearing mounting cavity 14.

In the embodiment, the valve core 2 is of an integrally formed structure manufactured by adopting a 3D printing technology, and in the printing process, the processing surface only needs to keep extremely small processing allowance, so that the processing amount is obviously reduced, and the processing production cost is also reduced. In addition, the technology can process the hollow structure under the condition of ensuring the mechanical strength of the valve core 2, so that the weight of the valve core 2 is reduced to the greatest extent, the smaller rotor inertia is obtained, and the response speed is improved. The valve core 2 is formed by printing ZrO2 ceramic materials, the hardness of the valve core 2 formed by printing the materials is larger than that of particle pollutants in fluid, abrasion of the valve core 2 caused by the particle pollutants in the fluid is avoided, and the service life, pollution resistance and reliability of the valve core 2 are improved.

The implementation principle of the rotary direct-drive switch valve of the embodiment is as follows: the driver 3 is opened by an operator, the driver 3 is electrified and starts to rotate after receiving a specified signal, and the rotating shaft of the driver 3 drives the valve core 2 to rotate together, so that the valve core oil inlet 21 and the valve core oil outlet 22 are respectively in a coaxial state with the valve body oil inlet 11 and the valve body oil outlet 12, and fluid respectively flows through the valve body oil inlet 11, the valve core oil inlet 21, the valve core oil outlet 22 and the valve body oil outlet 12, and is in a communication state of a switch valve. After the driver 3 continues to drive the valve core 2 to rotate and rotates 90 degrees, the coaxial axes of the valve core oil inlet 21 and the valve core oil outlet 22 are perpendicular to the coaxial axes of the valve body oil inlet 11 and the valve body oil outlet 12, and fluid cannot flow through the switching valve, so that the switching valve is in an off state, and the functions of rapidly executing the switching valve to switch on and off are realized.

In addition, when the switch valve is communicated, fluid flows into the valve cavity 13 through the oil drain channel 24, the driving end oil drain hole 25 and the closed end oil drain hole 26 respectively, so that a high-pressure environment is avoided in the valve body 1, the safety of operating the switch valve is improved, in addition, a lubrication effect is achieved, and the friction force of the valve core 2 rotating in the valve body 1 is reduced. When the on-off valve is opened, the oil drain hole 27 is provided coaxially with the valve body oil outlet 12, and the fluid remaining in the valve body 1 and the valve spool 2 is discharged from the oil drain hole 27 and the valve body oil outlet 12.

The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims

1. A rotary direct-drive switching valve, comprising: a valve body (1), a valve core (2) and a driver (3); the valve core (2) is rotatably arranged in the valve body (1); the driver (3) is connected with the valve core (2) and can drive the valve core (2) to rotate;

A valve body cavity (13) is formed in the valve body (1); the two sides of the valve body (1) are respectively provided with a valve body oil inlet (11) and a valve body oil outlet (12), and the valve body oil inlet (11) and the valve body oil outlet (12) are both communicated with the valve body cavity (13); two ends of the valve body (1) are respectively provided with a driving end cover (15) and a closed end cover (16); a spool cavity (23) is arranged in the spool (2); the diameter of the middle part of the valve core cavity (23) is larger than that of the end part; the two sides of the valve core (2) are respectively provided with a valve core oil inlet (21) and a valve core oil outlet (22), and the valve core oil inlet (21) and the valve core oil outlet (22) are communicated with the valve core cavity (23); the valve core oil inlet (21) can be communicated or staggered with the valve body oil inlet (11), and the valve core oil outlet (22) can be communicated or staggered with the valve body oil outlet (12).

2. The rotary direct-drive switching valve according to claim 1, wherein: the valve body oil inlet (11) and the valve body oil outlet (12) are both connected with a connecting pipe (4), a connecting component (5) is arranged on the connecting pipe (4), and the connecting component (5) is used for connecting an external pipeline.

3. The rotary direct-drive switching valve according to claim 1, wherein: the two ends of the valve core (2) are sleeved with connecting bearings (6), the two ends of the interior of the valve body (1) are provided with bearing mounting cavities (14), and the bearing mounting cavities (14) are communicated with the valve body cavity (13); the connecting bearing (6) is located within the bearing mounting cavity (14).

4. A rotary direct-drive switching valve according to claim 3, wherein: the bearing mounting cavity (14) is coaxially arranged with the valve body cavity (13), and the diameter of the bearing mounting cavity (14) is larger than that of the valve body cavity (13).

5. The rotary direct-drive switching valve according to claim 1, wherein: the valve core cavity (23) comprises a first cavity (231), a second cavity (232), a driving end cavity (233) and a closed end cavity (234); the second cavities (232) are arranged at two ends of the first cavity (231), and the diameter of the second cavities (232) is smaller than that of the first cavity (231); the driving end cavity (233) and the closed end cavity (234) are respectively correspondingly communicated with the two second cavities (232) and are arranged at two ends of the valve core (2); the driving end cavity (233) is used for being connected with the driver (3); the driving end cavity (233) and the closed end cavity (234) are communicated with the valve body cavity (13).

6. The rotary direct-drive switching valve according to claim 5, wherein: the driver (3) is a servo motor, a key groove (235) is formed in the inner side wall of the driving end cavity (233), a transmission key (31) is arranged on a rotating shaft of the servo motor, and the transmission key (31) is matched with the key groove (235).

7. The rotary direct-drive switching valve according to claim 5, wherein: and an oil drainage channel (24) is arranged between the second cavity (232) and the driving end cavity (233), and the diameter of the oil drainage channel (24) is smaller than that of the second cavity (232) and that of the driving end cavity (233).

8. The rotary direct-drive switching valve according to claim 7, wherein: a driving end oil drain hole (25), a closed end oil drain hole (26), an oil drain hole (27) and a connecting channel (28) are also arranged in the valve core (2); the driving end oil drain hole (25) is arranged on the side wall of the driving end of the valve core (2) and extends to be communicated with the oil drain channel (24); the closed end oil drain hole (26) is arranged on the side wall of the closed end of the valve core (2) and extends to be communicated with the closed end cavity (234); the oil drain hole (27) is arranged on the side wall of the valve core (2) and extends to be communicated with the first cavity (231); the projection of the oil drain hole (27) in the horizontal direction is perpendicular to the projection connecting line of the valve core oil outlet (22) and the valve core oil inlet (21) in the horizontal direction; the connecting channel (28) is arranged on the inner side wall of the driving end cavity (233) and is connected between the oil drain channel (24) and the valve body cavity (13).

9. The rotary direct-drive switching valve according to claim 1, wherein: the driver (3) is a servo motor, a fixed flange (17) is arranged at the driving end of the valve body (1), the servo motor is arranged on the fixed flange (17), and a rotating shaft of the servo motor is connected with the valve core (2).

10. The rotary direct-drive switching valve according to claim 1, wherein: the valve core (2) is of an integrally formed structure manufactured by adopting a 3D printing technology.