Automatic valve

Abstract

The utility model provides an automatic valve which comprises a pipe body, a flow baffle and a reset spring, a water inlet and a water outlet are formed in the two ends of the pipe body respectively, the flow baffle is slidably connected with the inner wall of the pipe body, an abutting part is arranged in the pipe body and located on the movement path of the flow baffle, and the reset spring is arranged on the pipe body. The reset spring is located in the pipe body, and the automatic valve is characterized in that the reset spring is located in the pipe body and connected to the flow baffle. When water flow pushes the flow baffle to close the valve, the reset spring enables the flow baffle to automatically return to the original position through the telescopic characteristic of the reset spring. Therefore, the valve can be automatically reset after each operation, the stability and the reliability of the valve are ensured, and the problem that a traditional valve lacks an automatic reset function is solved.

Description

Technical Field

[0001] This application relates to the field of valves, and particularly to an automatic valve. Background Art

[0002] A one-way valve, also known as a non-return valve or check valve, is a device used to control the flow direction of a fluid. It allows the fluid to flow freely in one direction while preventing or restricting the flow of the fluid in the other direction. Such valves are commonly used in situations where it is necessary to prevent the reverse flow or backflow of a fluid.

[0003] Traditional one-way valves usually lack an automatic reset function. Their internal flow-limiting structure moves with the water flow when water passes through the valve, resulting in an unstable initial position each time it is used. Therefore, the effect of controlling the water flow direction is unstable. This situation may lead to the water flow direction in the pipeline system not being reliably controlled, thus affecting the normal operation and efficiency of the system.

[0004] Especially in some scenarios where the liquid flow direction needs to be frequently changed, this defect is more prominent. For example, in the fluid pipeline system in industrial production, it may be necessary to frequently adjust the liquid flow direction according to the requirements of the production process. However, the traditional one-way valve cannot achieve automatic reset, which will bring inconvenience and low efficiency to these application scenarios.

[0005] Therefore, it is necessary to design a new type of automatic valve that can solve the problem of insufficient automatic reset function existing in traditional one-way valves. Summary of the Utility Model

[0006] In view of this, it is necessary to provide a new type of automatic valve to solve the above problems.

[0007] An embodiment of this application provides a new type of automatic valve, including:

[0008] A pipe body, with a water inlet and a water outlet respectively opened at both ends of the pipe body, and the water inlet is in communication with the water outlet;

[0009] A baffle plate, which is arranged inside the pipe body. The baffle plate is slidably connected to the inner wall of the pipe body. There is an abutting portion inside the pipe body, and the abutting portion is located on the movement path of the baffle plate. When the baffle plate moves to fit with the abutting portion, the communication between the water inlet and the water outlet is cut off;

[0010] A return spring, which is located inside the pipe body. The telescopic direction of the return spring is parallel to the sliding direction of the baffle plate. One end of the return spring is arranged on the pipe body, and the other end of the return spring is fixedly connected to the baffle plate.

[0011] In at least one embodiment of the present application, the baffle includes a flow-blocking portion and a plurality of sliding portions provided on the flow-blocking portion. The sliding portions are in contact with the pipe body. A flow area is formed between two adjacent sliding portions, the flow-blocking portion, and the pipe body. The flow area is communicated with the water outlet, and the flow-blocking portion is in contact with the abutting portion to cut off the communication between the water outlet and the water inlet.

[0012] In at least one embodiment of the present application, a limiting portion is further provided in the pipe body. The limiting portion is located on the movement path of the baffle, and the baffle is located between the limiting portion and the abutting portion.

[0013] In at least one embodiment of the present application, a first sealing ring is provided at one end of the flow-blocking portion away from the return spring. The first sealing ring moves with the baffle to be in contact with the abutting portion to cut off the communication between the water outlet and the water inlet.

[0014] In at least one embodiment of the present application, the pipe body includes a first pipe and a second pipe detachably connected to the first pipe. The water inlet is provided on the first pipe, and the water outlet is provided on the second pipe.

[0015] In at least one embodiment of the present application, the length direction of the first pipe is parallel to the length direction of the second pipe. A threaded hole is provided on the inner wall of the first pipe, and a threaded connection portion is provided on the outer wall of the second pipe. The axis of the threaded hole coincides with the axis of the first pipe, and the axis of the threaded connection portion coincides with the axis of the second pipe. Rotating the first pipe drives the threaded connection portion to screw into or out of the threaded hole.

[0016] In at least one embodiment of the present application, a second sealing ring is provided at one end of the threaded connection portion away from the first pipe, and the first pipe can move to be in contact with the second sealing ring.

[0017] In at least one embodiment of the present application, a guiding portion is provided on one side of the baffle close to the limiting portion. The guiding portion is in contact with the limiting portion, and the guiding portion is slidably connected to the limiting portion. The guiding portion slides along the movement direction of the baffle.

[0018] In at least one embodiment of the present application, one end of the return spring provided in the pipe body is located in the second pipe. The return spring is in a compressed state in the pipe body. When the thrust of the external liquid flow entering from the water inlet on the baffle is less than the thrust of the return spring on the baffle, the return spring pushes the baffle to move towards the abutting portion and finally abut against the abutting portion.

[0019] In at least one embodiment of the present application, a placement table is provided on the threaded connection portion, the second sealing ring is provided on the placement table, and the second sealing ring is located between the placement table and the first pipe.

[0020] In the automatic valve provided above, the return spring is located inside the pipe body and connected to the baffle. When the water flow pushes the baffle to close the valve, the return spring, through its telescopic property, enables the baffle to automatically return to its original position. In this way, the valve can automatically reset after each operation, ensuring the stability and reliability of the valve, thus solving the problem that traditional valves lack the automatic reset function. Brief Description of the Drawings

[0021] Figure 1 is a three-dimensional structure diagram of the automatic valve;

[0022] Figure 2 is an exploded view of the structure of the automatic valve;

[0023] Figure 3 is an exploded view of the structure of the automatic valve;

[0024] Figure 4 is a side view of the automatic valve;

[0025] Figure 5 is Figure 4 a sectional view of.

[0026] Description of the Main Component Symbols

[0027] 100, automatic valve; 1, pipe body; 11, first pipe; 111, water inlet; 112, threaded hole; 113, abutting portion; 114, limiting portion; 12, second pipe; 121, water outlet; 122, threaded connection portion; 123, placement table; 2, return spring; 3, baffle; 31, guiding portion; 32, blocking portion; 33, sliding portion; 4, first sealing ring; 5, second sealing ring; a, flow area. Detailed Description of the Embodiments

[0028] Next, the embodiments of the present application will be described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0029] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component present. When a component is considered to be "provided on" another component, it can be directly provided on the other component or there may be an intermediate component present. The terms "top", "bottom", "upper", "lower", "left", "right", "front", "rear", and similar expressions used herein are only for the purpose of illustration.

[0030] An embodiment of the present application provides an automatic valve, including:

[0031] A pipe body, with a water inlet and a water outlet respectively opened at both ends of the pipe body, and the water inlet is communicated with the water outlet;

[0032] A baffle plate, which is arranged in the pipe body, the baffle plate is slidably connected to the inner wall of the pipe body, there is an abutting portion in the pipe body, the abutting portion is located on the movement path of the baffle plate, and when the baffle plate moves to fit with the abutting portion, the communication between the water inlet and the water outlet is cut off;

[0033] A return spring, which is located in the pipe body, the telescopic direction of the return spring is parallel to the sliding direction of the baffle plate, one end of the return spring is arranged on the pipe body, and the other end of the return spring is fixedly connected to the baffle plate. The above-provided automatic valve has the return spring located in the pipe body and connected to the baffle plate. When the water flow pushes the baffle plate to close the valve, the return spring will, through its telescopic characteristic, enable the baffle plate to automatically return to its original position. In this way, the valve can automatically reset after each operation, ensuring the stability and reliability of the valve, thereby solving the problem that traditional valves lack an automatic reset function.

[0034] The following will describe in detail some embodiments of the present application with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0035] Please refer to Figures 1-5 , an embodiment of the present application provides an automatic valve 100, including a pipe body 1, a baffle plate 3 and a return spring 2. The pipe body 1 has a water inlet 111 and a water outlet 121 respectively opened at both ends, and the water inlet 111 is communicated with the water outlet 121. The baffle plate 3 is arranged in the pipe body 1, the baffle plate 3 is slidably connected to the inner wall of the pipe body 1, there is an abutting portion 113 in the pipe body 1, the abutting portion 113 is located on the movement path of the baffle plate 3, and when the baffle plate 3 moves to fit with the abutting portion 113, the communication between the water inlet 111 and the water outlet 121 is cut off. The return spring 2 is located in the pipe body 1, the telescopic direction of the return spring 2 is parallel to the sliding direction of the baffle plate 3, one end of the return spring 2 is arranged on the pipe body 1, and the other end of the return spring 2 is fixedly connected to the baffle plate 3.

[0036] Specifically, the pipe body 1 is the main structure of the valve, and the water inlet 111 and the water outlet 121 are used for controlling the water flow in the pipeline system. The main function of this structure is to provide a fluid passage, allowing the fluid to enter from the water inlet 111, pass through the valve, and flow out from the water outlet 121. The fluid enters the pipe body 1 through the water inlet 111, and under the control of the valve, flows through the baffle 3 and is discharged through the water outlet 121. The function of the baffle 3 is to control the fluid passage, enabling it to flow through or be blocked. When the baffle 3 moves to fit with the abutting portion 113, the connection between the water inlet 111 and the water outlet 121 is cut off, realizing the closing of the valve. The baffle 3 is slidably connected to the inner wall of the pipe body 1 and will move along the movement path inside the pipe body 1 when acted upon by an external force. When the baffle 3 moves to fit with the abutting portion 113, the valve closes, preventing the fluid from passing through. The function of the return spring 2 is to provide the return force of the valve, that is, when there is no external force, it restores the baffle 3 to the open state to ensure the normal operation of the valve. The return spring 2 is fixedly connected to the baffle 3. After the external force is removed, the return spring 2 will move the baffle 3 to the open position to reopen the valve.

[0037] In a specific example, the baffle 3 includes a baffle portion 32 and a plurality of sliding portions 33 provided on the baffle portion 32. The sliding portions 33 are in contact with the pipe body 1. A flow area a is formed between two adjacent sliding portions 33, the baffle portion 32 and the pipe body 1. The flow area a is communicated with the water outlet 121. When the baffle portion 32 fits with the abutting portion 113, the connection between the water outlet 121 and the water inlet 111 is cut off.

[0038] Specifically, this is the main part of the baffle 3, whose function is to block or guide the flow of the fluid. The baffle portion 32 is slidably connected to the inner wall of the pipe body 1 and fits with the abutting portion 113 to cut off the connection between the water outlet 121 and the water inlet 111. A plurality of sliding portions 33 are provided on the baffle 3. They are connected to the baffle portion 32 and fit with the inner wall of the pipe body 1. A flow area a is formed between two adjacent sliding portions 33. A flow area a is formed between two adjacent sliding portions 33, the baffle portion 32 and the pipe body 1. This area allows the fluid to flow out from the water outlet 121 when the baffle 3 is closed, acting as a passage. This flow area a is communicated with the water outlet 121, enabling the fluid to be discharged from the system through the valve. When the baffle 3 moves to fit with the abutting portion 113, the baffle portion 32 and the abutting portion 113 form a seal, cutting off the connection between the water outlet 121 and the water inlet 111. This means that when the valve is closed, the fluid cannot flow from the water inlet 111 through the baffle 3 to the water outlet 121, effectively stopping the flow of the fluid.

[0039] In a specific example, a limiting part 114 is further provided in the pipe body 1. The limiting part 114 is located on the movement path of the baffle 3, and the baffle 3 is located between the limiting part 114 and the abutting part 113.

[0040] Specifically, the limiting part 114 is a component within the pipe body 1 and is located on the movement path of the baffle 3. Its main function is to limit the movement range of the baffle 3 to ensure that the baffle 3 works in the correct position. The limiting part 114 is located on the movement path of the baffle 3, and the baffle 3 is located between the limiting part 114 and the abutting part 113. Such a design ensures that the baffle 3 can be accurately positioned during movement, avoiding problems caused by excessive movement or inaccurate positioning. Through the setting of the limiting part 114, the accurate position of the baffle 3 during the opening and closing processes is ensured, thus guaranteeing the normal operation of the valve. When the baffle 3 moves to the limiting part 114, the limiting part 114 plays a stopping role, preventing the baffle 3 from moving excessively and also providing a guarantee for the correct docking between the baffle 3 and the abutting part 113. During the operation of the valve, the baffle 3 moves along the movement path within the pipe body 1. When the baffle 3 reaches the limiting part 114, its movement is restricted and it no longer moves to a farther position. Through the action of the limiting part 114, it is ensured that the baffle 3 stops moving at the appropriate position, thus guaranteeing the normal opening and closing operations of the valve.

[0041] In a specific example, a first sealing ring 4 is provided at one end of the baffle part 32 away from the return spring 2; the first sealing ring 4 moves with the baffle 3 to fit with the abutting part 113 to cut off the communication between the water outlet 121 and the water inlet 111.

[0042] Specifically, the first sealing ring 4 is located at one end of the baffle 3 away from the return spring 2, usually near the closing end of the valve. This position design aims to ensure that when the valve is closed, the communication between the water outlet 121 and the water inlet 111 can be effectively sealed. When the baffle 3 moves to fit with the abutting part 113, that is, in the closed state of the valve, the first sealing ring 4 will closely fit with the abutting part 113 to form an effective seal, cutting off the communication between the water outlet 121 and the water inlet 111. The formation of this seal is one of the key steps in closing the valve, which ensures the sealing performance of the valve in the closed state and prevents fluid leakage or backflow. The setting of the first sealing ring 4 can effectively prevent the fluid from flowing back from the water outlet 121 to the water inlet 111 or leaking from the water inlet 111 to the water outlet 121, ensuring the sealing performance of the valve in the closed state. Such a design ensures that the valve can effectively stop the fluid flow when closed, thus realizing the normal closing function of the valve and avoiding problems caused by fluid leakage or backflow.

[0043] In a specific example, the pipe body 1 includes a first pipe 11 and a second pipe 12 detachably connected to the first pipe 11. The water inlet 111 is provided on the first pipe 11, and the water outlet 121 is provided on the second pipe 12.

[0044] Specifically, the first pipe 11 and the second pipe 12 form the main structure of the pipe body 1. The first pipe 11 is usually the end close to the water inlet 111, and the second pipe 12 is located at the end of the water outlet 121. The design of the first pipe 11 and the second pipe 12 makes the valve have a more flexible structure, which is convenient for installation and maintenance. The detachable connection design of the second pipe 12 allows users to replace or repair the water outlet 121 part as needed without changing the entire valve structure. The water inlet 111 is provided on the first pipe 11, and the water outlet 121 is provided on the second pipe 12. Such a design enables the fluid to smoothly enter the valve from the water inlet 111, pass through the baffle 3, and then flow out from the water outlet 121. The position settings of the water inlet 111 and the water outlet 121 directly affect the flow path of the fluid, ensuring that the fluid can smoothly pass through the valve for control and regulation. The detachable connection design between the first pipe 11 and the second pipe 12 brings some advantages. For example, when it is necessary to replace or repair the water outlet 121 part, only the second pipe 12 part needs to be disassembled without changing the entire valve structure, saving time and cost. This design makes the valve more flexible and convenient during installation and maintenance, improving the maintainability and operability of the valve.

[0045] In a specific example, the length direction of the first pipe 11 is parallel to the length direction of the second pipe 12. A threaded hole 112 is provided on the inner wall of the first pipe 11, and a threaded connection portion 122 is provided on the outer wall of the second pipe 12. The axis of the threaded hole 112 coincides with the axis of the first pipe 11, and the axis of the threaded connection portion 122 coincides with the axis of the second pipe 12. Rotating the first pipe 11 drives the threaded connection portion 122 to screw into or out of the threaded hole 112.

[0046] Specifically, the parallelism of the longitudinal directions of the first tube 11 and the second tube 12 means that their axes are parallel, rather than perpendicular or inclined. Such a design ensures the alignment between the two tubes and the stability of the connection. A threaded hole 112 is provided on the inner wall of the first tube 11, and a threaded connection portion 122 is provided on the outer wall of the second tube 12. This design enables the two tubes to be fastened by a threaded connection method, thereby achieving a reliable connection. The threaded connection method has good sealing performance and load-bearing capacity, and is suitable for occasions where a high connection strength and stability are required. When it is necessary to connect or disconnect the second tube 12, the first tube 11 can be rotated to drive the threaded connection portion 122 to screw into or out of the threaded hole 112. Such a design makes the connection and disconnection processes more convenient and effective. By rotating the first tube 11, the threaded connection portion 122 can be smoothly docked with or disengaged from the threaded hole 112, achieving the connection or disconnection between the two tubes. The threaded connection method is simple and reliable, and no additional tools or equipment are required for the connection and disconnection operations, which is convenient for maintenance and replacement. The coincidence of the axes ensures the accuracy and stability of the connection, avoiding problems such as offset or looseness during the connection process, and guaranteeing the sealing performance and reliability of the connection.

[0047] In a specific example, a second sealing ring 5 is provided at one end of the threaded connection portion 122 away from the first tube 11, and the first tube 11 can move to fit with the second sealing ring 5.

[0048] Specifically, the second sealing ring 5 is located at a position of the threaded connection portion 122 away from the first tube 11. Such a design enables the first tube 11 to move to fit with the second sealing ring 5 when the valve is closed, achieving the sealed closure of the valve. The presence of the second sealing ring 5 effectively prevents possible leakage problems when the valve is closed. When the first tube 11 moves to fit with the second sealing ring 5, a sealed environment is formed between the sealing ring and the second tube 12, preventing fluid from leaking from the connection. When it is necessary to close the valve, the first tube 11 is rotated to dock the threaded connection portion 122 with the threaded hole 112. At the position of the connection portion away from the first tube 11, the second sealing ring 5 approaches as the first tube 11 moves until it fits with the surface of the second tube 12. When the first tube 11 moves to fit with the second sealing ring 5, the sealing effect between the sealing ring and the second tube 12 ensures the closure of the valve and prevents fluid leakage. The setting of the second sealing ring 5 guarantees the sealing effect of the valve when it is closed. The fitting of the sealing ring forms a sealed environment at the connection, avoiding fluid leakage and ensuring the normal operation of the valve.

[0049] In a specific example, a guiding portion 31 is provided on a side of the baffle 3 close to the limiting portion 114. The guiding portion 31 is attached to the limiting portion 114, and the guiding portion 31 is slidably connected to the limiting portion 114. The guiding portion 31 slides along the moving direction of the baffle 3.

[0050] Specifically, the guiding portion 31 is located on a side of the baffle 3 close to the limiting portion 114, usually at one edge or corner of the baffle 3. Its main function is to guide and limit the moving direction of the baffle 3 during the movement of the baffle 3, ensuring that the baffle 3 moves along the correct path. The guiding portion 31 is attached to the limiting portion 114, and this attachment ensures that the guiding portion 31 can accurately slide along the limiting portion 114 and maintain its adjacent relationship. The sliding connection between the guiding portion 31 and the limiting portion 114 ensures the stability and smoothness of the baffle 3 during movement, avoiding deviation or instability of the baffle 3 during movement. The guiding portion 31 slides along the moving direction of the baffle 3. This design ensures that the baffle 3 can smoothly move along the set path during movement without being hindered or interfered by the limiting portion 114. The setting of the guiding portion 31 can effectively guide and limit the movement of the baffle 3, ensuring that it moves along the predetermined path. This can ensure the accuracy and stability of the baffle 3 when opening and closing the valve, avoiding valve failure or malfunction caused by unstable movement of the baffle 3.

[0051] In a specific example, one end of the return spring 2 provided in the pipe body 1 is located in the second pipe 12. The return spring 2 is in a compressed state in the pipe body 1. When the thrust of the external liquid flow entering from the water inlet 111 on the baffle 3 is less than the thrust of the return spring 2 on the baffle 3, the return spring 2 pushes the baffle 3 towards the abutting portion 113 and finally abuts against the abutting portion 113.

[0052] Specifically, the return spring 2 is located inside the pipe body 1, with one end inside the second pipe 12. This setting ensures that the spring can be firmly fixed inside the pipe body 1 and is connected to the baffle 3. Inside the pipe body 1, the return spring 2 is in a compressed state, that is, the spring is squeezed at one end, maintaining a certain tension state. When the external liquid flow enters from the water inlet 111, it exerts pressure on the baffle 3, attempting to push the baffle 3 to close the valve. However, when the thrust of the external liquid flow is less than the thrust of the return spring 2 on the baffle 3, the return spring 2 will dominate the movement of the baffle 3. When the thrust of the external liquid flow is less than the thrust of the return spring 2, the return spring 2 will push the baffle 3 towards the abutting portion 113. This is because the tension of the return spring 2 is greater than the thrust of the external liquid flow on the baffle 3, causing the baffle 3 to move towards the closed position under the action of the return spring 2. Finally, the baffle 3 will abut against the abutting portion 113, forming a sealed closed state, cutting off the connection between the water inlet 111 and the water outlet 121, and realizing the closing of the valve. The setting of the return spring 2 ensures that the valve can automatically return to the closed position when there is no external thrust, guaranteeing the normal closing and sealing performance of the valve. When the thrust of the external liquid flow on the baffle 3 is not sufficient to close the valve, the return spring 2 plays a key role in pushing the baffle 3 towards the closed position, ensuring the reliability and stability of the valve.

[0053] In a specific example, a placement table 123 is provided on the threaded connection portion 122, the second sealing ring 5 is disposed on the placement table 123, and the second sealing ring 5 is located between the placement table 123 and the first pipe 11.

[0054] Specifically, the placement table 123 is a platform or support structure located on the threaded connection portion 122. Its main function is to provide a support and fixed position for the second sealing ring 5, ensuring that the sealing ring can be accurately installed on the threaded connection portion 122. The second sealing ring 5 is located on the placement table 123 and is in the position between the placement table 123 and the first pipe 11. This position design enables the second sealing ring 5 to effectively seal the gap between the threaded connection portion 122 and the first pipe 11, playing a sealing role. The placement table 123 not only provides a position for installing the second sealing ring 5, but also can fix the sealing ring and ensure good sealing performance between it and the threaded connection portion 122. Through the setting of the placement table 123, the second sealing ring 5 can be accurately installed on the threaded connection portion 122 and maintain a sealed state with the first pipe 11, thereby preventing fluid leakage or seepage.

[0055] The above are only the embodiments of the present application. It should be noted here that for those of ordinary skill in the art, without departing from the creative concept of the present application, improvements can still be made, but these all fall within the protection scope of the present application.

Claims

1. An automatic valve, characterized in that: include: A pipe body, wherein two ends of the pipe body are respectively provided with a water inlet and a water outlet, and the water inlet and the water outlet are connected to each other; a baffle, the baffle being disposed in the tube body, the baffle being slidably connected to the inner wall of the tube body, the tube body being provided with an abutment portion, the abutment portion being located on the movement path of the baffle, and the baffle cutting off the connection between the water inlet and the water outlet when the baffle moves to fit the abutment portion; A return spring is located in the tube body, the expansion and contraction direction of the return spring is parallel to the sliding direction of the baffle plate, one end of the return spring is arranged on the tube body, and the other end of the return spring is fixedly connected to the baffle plate.

2. The automatic valve according to claim 1, characterized in that: The baffle plate includes a baffle portion and a plurality of sliding portions arranged on the baffle portion, the sliding portion is fitted with the tube body, a flow zone is formed between two adjacent sliding portions, the baffle portion and the tube body, the flow zone is connected with the water outlet, and the baffle portion is fitted with the abutment portion to cut off the connection between the water outlet and the water inlet.

3. The automatic valve according to claim 2, characterized in that: A limiting portion is further provided in the tube body, and the limiting portion is located on the movement path of the baffle plate, and the baffle plate is located between the limiting portion and the abutting portion.

4. The automatic valve according to claim 3, characterized in that: A first sealing ring is provided at one end of the baffle portion away from the return spring; the first sealing ring moves with the baffle plate to fit with the abutment portion to cut off the connection between the water outlet and the water inlet.

5. The automatic valve according to claim 1, characterized in that: The tube body comprises a first tube and a second tube detachably connected to the first tube, the water inlet is arranged on the first tube, and the water outlet is arranged on the second tube.

6. The automatic valve according to claim 5, characterized in that: The length direction of the first tube is parallel to the length direction of the second tube. A threaded hole is provided on the inner wall of the first tube, and a threaded connection part is provided on the outer wall of the second tube. The axis of the threaded hole coincides with the axis of the first tube, and the axis of the threaded connection part coincides with the axis of the second tube. Rotating the first tube drives the threaded connection part to screw in or out of the threaded hole.

7. The automatic valve according to claim 6, characterized in that: A second sealing ring is provided at one end of the threaded connection portion away from the first tube, and the first tube can move to fit with the second sealing ring.

8. The automatic valve according to claim 3, characterized in that: A guide portion is provided on one side of the baffle plate close to the limiting portion. The guide portion is attached to the limiting portion and is slidably connected to the limiting portion. The guide portion slides along the movement direction of the baffle plate.

9. The automatic valve according to claim 7, characterized in that: One end of the return spring disposed in the tube body is located in the second tube, and the return spring is in a compressed state in the tube body. When the thrust of the external liquid flow entering from the water inlet on the baffle plate is smaller than the thrust of the return spring on the baffle plate, the return spring pushes the baffle plate to move toward the abutment portion and finally abuts against the abutment portion.

10. The automatic valve according to claim 7, characterized in that: A placement platform is provided on the threaded connection portion, the second sealing ring is provided on the placement platform, and the second sealing ring is located between the placement platform and the first tube.

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