Reducing three-way valve

Abstract

The utility model provides a variable-diameter three-way valve, belongs to the technical field of variable-diameter valves, and solves the technical problems that the position and the interface size of a one-way valve of an existing three-way valve cannot be adjusted and the like. Comprising a three-way valve body, a three-way valve core and a movable blocking ring are arranged in the three-way valve body, the three-way valve core is sleeved with the movable blocking ring, a connecting rod is screwed to the upper end of the three-way valve body, a driving motor is fixed to the upper end of the connecting rod, and an output shaft of the driving motor is fixedly connected with the three-way valve core; the left side and the right side of the three-way valve body are in threaded connection with a first reducer union and a third reducer union respectively, the front side of the three-way valve body is in threaded connection with a one-way valve body, a diaphragm assembly, a reset spring, a supporting frame and a first sealing gasket are sequentially arranged in the one-way valve body from front to back, and the front side of the one-way valve body is in threaded connection with a second reducer union. The pipeline connector can be connected with external pipelines with different pipe diameters and is convenient to use; the position of the one-way valve body can be adjusted, one-way circulation is achieved, the application range is wide, and circulation and flow direction of the three-way valve can be controlled.

Description

Technical Field

[0001] The utility model belongs to the technical field of variable diameter valves and relates to a three-way valve, in particular to a variable diameter three-way valve. Background Art

[0002] One-way valves are widely used in the market and in daily life. They can effectively prevent water and gas backflow and achieve the desired effects in many occasions, so they are widely used. The difference between a three-way valve and an ordinary valve is that there is an outlet at the bottom. When the internal valve core is in different positions, the outlet is different. The overall structure of the current three-way valve with a one-way valve function is fixed, and it is impossible to flexibly adjust the position of the one-way valve, the size of the interface, and the direction of fluid in and out, etc., and the usage is relatively limited.

[0003] Therefore, we propose a variable diameter three-way valve, which can be connected to external pipes of different diameters and is easy to use; the position of the one-way valve body can be adjusted, one-way flow, and the application range is wide, and the flow and flow direction of the three-way valve can be controlled. Utility Model Content

[0004] The purpose of the utility model is to solve the above problems in the existing technology and propose a variable diameter three-way valve. The technical problem to be solved by the utility model is: how to connect external pipelines with different diameters and adjust the position of the one-way valve body, while realizing the control of the circulation and flow direction of the three-way valve.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A variable diameter three-way valve comprises a three-way valve body, wherein a three-way valve core and a movable blocking ring are arranged inside the three-way valve body, and the movable blocking ring is sleeved on the outside of the three-way valve core, a connecting rod is screwed on the upper end of the three-way valve body, a sealing gasket 2 is arranged between the connecting rod and the three-way valve body, a driving motor is fixed on the upper end of the connecting rod, the output shaft of the driving motor passes through the connecting rod and extends into the three-way valve body and is fixedly connected to the three-way valve core, a reducing joint 1 and a reducing joint 3 are screwed on the left and right sides of the three-way valve body respectively, and the reducing joint 1 and the three-way valve body and the reducing joint are connected. Two sealing rubber rings are respectively provided between the three-way and three-way valve bodies, a one-way valve body is screwed on the front side of the three-way valve body, a diaphragm assembly, a return spring, a support frame and a sealing gasket are arranged in sequence from front to back inside the one-way valve body, and the diaphragm assembly is slidably arranged in the one-way valve body, the return spring is sleeved on the diaphragm assembly, the rear side of the return spring abuts on the support frame, the support frame abuts on the sealing gasket, the sealing gasket abuts on the three-way valve body, a reducer two is screwed on the front side of the one-way valve body, and a sealing rubber ring is provided between the reducer two and the one-way valve body.

[0007] The working principle of the utility model is as follows: during installation, the positions of the one-way valve body, the reducer three and the reducer one can be adjusted according to the working environment, which is convenient for installation. When the fluid is introduced from the reducer two, when the pressure is relatively low, the fluid enters the one-way valve body and cannot push the diaphragm assembly supported by the reset spring, thereby blocking the passage of the fluid and preventing leakage. When the pressure is relatively high, the fluid pushes the diaphragm assembly to slide in the one-way valve body, and the diaphragm assembly pushes the reset spring. At this time, the diaphragm assembly no longer blocks the passage of the fluid, and the fluid enters the three-way valve body from the support frame and reaches the three-way valve core, and flows out from the reducer one or the reducer three after being distributed by the three-way valve core. When the three-way is not needed, the output shaft of the driving motor drives the three-way valve core to rotate, and the three-way valve core drives the movable blocking ring to move and adjust its position to adjust the circulation and flow direction of the fluid. When the fluid is introduced from the reducer one or the reducer three, the fluid pushes the diaphragm assembly to contact the one-way valve body, thereby blocking the passage of the fluid and realizing one-way circulation.

[0008] The three-way valve body is provided with three pipe interfaces distributed in a T shape, each of which is provided with an internal thread, and each of the pipe interfaces is provided with a three-way pipe. The three three-way pipes intersect and communicate inside the three-way valve body, and a valve core space is formed inside the three-way valve body. A driving interface is provided at the upper end of the three-way valve body, a connecting rod is threadedly connected to the driving interface, and the driving interface is connected to the valve core space.

[0009] With the above structure, the pipe interface and the internal thread 1 are used to connect the reducer 1 and the reducer 3, and the valve core space and the drive interface facilitate the installation of the three-way valve core and the movable blocking ring.

[0010] The one-way valve body includes a connecting valve body and a working valve body, a perforated spacer ring is arranged between the working valve body and the connecting valve body, a sliding limit tube, a wedge-shaped avoidance tube and a blocking ring are arranged in sequence from front to back inside the working valve body, an outer rear end of the connecting valve body is provided with an external thread 1, the external thread 1 cooperates with the internal thread 1, and an internal thread 2 is arranged inside the connecting valve body, and the specification of the internal thread 2 is consistent with that of the internal thread 1.

[0011] With the above structure, the perforated spacer ring facilitates the installation of the diaphragm assembly, the external thread cooperates with the internal thread, the sliding limit tube is used for the sliding of the diaphragm assembly to have a certain opening pressure, the wedge-shaped avoidance ring facilitates the diaphragm assembly to exit and enter the sliding limit tube, and the blocking ring is used to install the support frame.

[0012] The support frame includes a limit seat, and a plurality of brackets evenly distributed around the circumference are provided on the outer side of the limit seat. A sliding hole is opened on the sliding hole. Both ends of the bracket extend out of the front and rear sides of the limit seat, and the front extending part forms a spring mounting hole. The reset spring is arranged in the spring mounting hole, and one end of the bracket abuts against the blocking ring, and the other end of the bracket abuts against the sealing gasket.

[0013] With the above structure, the limit seat and the sliding hole facilitate the sliding of the diaphragm assembly, the spring mounting hole facilitates the fixing of the return spring, and a plurality of brackets support the diaphragm assembly to limit the maximum pressure and ensure stable pressure.

[0014] The diaphragm assembly includes a movable rod, which is slidably arranged in a sliding hole. A circular diaphragm is arranged at the end of the movable rod, and a flexible rubber ring is arranged on the outer side of the circular diaphragm. The circular diaphragm is slidably arranged in a sliding limit tube, and the flexible rubber ring abuts against the sliding limit tube.

[0015] With the above structure, when the pressure of the fluid introduced from the front side of the one-way valve body is relatively small, the fluid pushes the circular diaphragm, the circular diaphragm slides in the sliding limit tube, and under the support of the reset spring, does not withdraw from the sliding limit tube, blocking the passage of the fluid; when the pressure of the introduced fluid is relatively large, the fluid pushes the circular diaphragm, compresses the reset spring, the circular diaphragm withdraws from the sliding limit tube and enters the wedge-shaped avoidance tube, no longer blocking the passage of the fluid; when the fluid is introduced from the rear side of the one-way valve body, the fluid pushes the circular diaphragm, the circular diaphragm contacts the one-way valve body, blocking the passage of the fluid.

[0016] The movable blocking ring is arranged in the valve core space, and a pushing groove and three valve core through holes are opened on the movable blocking ring. The aperture of the valve core through hole is the same as the inner circle diameter of the three-way pipeline.

[0017] With the above structure, the push groove facilitates the movement of the movable blocking ring, adjusts the relative positions of the three valve core through holes 1, and thus controls the closing and opening of the valve core through hole 1.

[0018] The three-way valve core is provided with three valve core through holes 2, the valve core through holes 2 have the same aperture as the valve core through hole 1, the positions of the valve core through holes 2 and the valve core through hole 1 correspond to each other, and the three valve core through holes 2 intersect and communicate inside the three-way valve core, a push tube is provided on one of the valve core through holes 2, and the push tube is located in the push groove, and the end face of the push tube is flush with the outer end face of the movable blocking ring.

[0019] By adopting the above structure, the pushing tube pushes the pushing groove to adjust the relative position of the three-way valve core and the movable blocking ring, control the connection and closing of the three valve core through holes 2 and the three valve core through holes 1, and at the same time adjust the position relative to the three three-way pipes, thereby controlling the circulation and flow direction of the fluid.

[0020] The outer side of one end of the reducer is provided with an external thread 2, the inner side of the other end of the reducer is provided with an internal thread 3, and the outer diameter of the reducer at one end is the same as the inner diameter of the pipeline interface;

[0021] The structure of the reducer 2 is the same as that of the reducer 1. The outer diameter of one end of the reducer 2 is the same as the inner diameter of the pipeline interface, and the inner diameter of the other end of the reducer 2 is different from the inner diameter of the other end of the reducer 1.

[0022] The structure of reducer three is the same as that of reducer one. The outer diameter of one end of reducer three is the same as the inner diameter of the pipeline interface, and the inner diameter of the other end of reducer three is different from the inner diameter of the other end of reducer one.

[0023] With the above structure, reducer 1, reducer 2 and reducer 3 are used to connect external pipelines with different diameters, which is convenient for the installation and use of the three-way valve.

[0024] Compared with the prior art, this variable diameter three-way valve has the following advantages:

[0025] 1. Through the three-way valve body and reducer 3, reducer 2 and reducer 1, external pipes with different diameters can be connected for easy use.

[0026] 2. Through the cooperation of the three-way valve body and the one-way valve body, the position of the one-way valve body can be adjusted, and the outer diameter of the pipe connected to the reducer can be adjusted, which has a wide range of applications.

[0027] 3. The one-way valve body cooperates with the diaphragm assembly, the return spring and the support frame to limit the valve opening pressure range, prevent leakage, control the fluid flow direction, and achieve one-way circulation.

[0028] 4. By driving the motor to cooperate with the three-way valve body, the three-way valve core and the movable blocking ring, the relative positions of the three-way valve core and the movable blocking ring are adjusted to control the circulation and flow direction of the fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0030] Figure 2 It is a schematic diagram of the exploded structure of the utility model.

[0031] Figure 3 It is a partial cross-sectional structural schematic diagram of the utility model.

[0032] Figure 4 It is a three-dimensional structural schematic diagram of the three-way valve body in the utility model.

[0033] Figure 5 It is a three-dimensional structural schematic diagram of the one-way valve body in the utility model.

[0034] Figure 6 It is a three-dimensional structural schematic diagram of the support frame in the utility model.

[0035] Figure 7 It is a three-dimensional structural schematic diagram of the diaphragm assembly in the utility model.

[0036] Figure 8 It is a three-dimensional structural schematic diagram of the movable blocking ring in the utility model.

[0037] Fig. 9 It is a structural schematic diagram of a three-way valve core in the utility model.

[0038] In the figure, 1, reducer 1; 2, three-way valve body; 3, reducer 2; 4, one-way valve body; 5, reducer 3; 6, connecting rod; 7, driving motor; 8, sealing rubber ring 1; 9, diaphragm assembly; 10, reset spring; 11, support frame; 12, sealing gasket 1; 13, sealing rubber ring 2; 14, movable blocking ring; 15, three-way valve core; 16, sealing gasket 2; 17, pipeline interface; 18, driving interface; 19, three-way pipeline; 20, connecting valve body; 21, working valve body; 22, blocking ring; 23, bracket; 24, sliding hole; 25, limit seat; 26, flexible rubber ring; 27, circular diaphragm; 28, movable rod; 29, valve core through hole 1; 30, push groove; 31, push tube; 32, valve core through hole 2. DETAILED DESCRIPTION

[0039] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0040] like Figure 1-Figure 9 As shown, the variable diameter three-way valve comprises a three-way valve body 2, a three-way valve core 15 and a movable blocking ring 14 are arranged inside the three-way valve body 2, and the movable blocking ring 14 is sleeved on the outside of the three-way valve core 15, a connecting rod 6 is screwed on the upper end of the three-way valve body 2, a sealing gasket 2 16 is arranged between the connecting rod 6 and the three-way valve body 2, a driving motor 7 is fixed to the upper end of the connecting rod 6, the output shaft of the driving motor 7 passes through the connecting rod 6 and extends into the three-way valve body 2 and is fixedly connected to the three-way valve core 15, a reducing joint 1 and a reducing joint 3 5 are screwed on the left and right sides of the three-way valve body 2 respectively, and the reducing joint 1 and the three-way valve body 2 and the reducing joint 3 5 and the three-way valve body 2 are connected. A sealing rubber ring 13 is provided between the three-way valve body 2, a one-way valve body 4 is screwed on the front side of the three-way valve body 2, a diaphragm assembly 9, a return spring 10, a support frame 11 and a sealing gasket 12 are provided inside the one-way valve body 4 from front to back, and the diaphragm assembly 9 is slidably arranged in the one-way valve body 4, the return spring 10 is sleeved on the diaphragm assembly 9, the rear side of the return spring 10 abuts on the support frame 11, the support frame 11 abuts on the sealing gasket 12, and the sealing gasket 12 abuts on the three-way valve body 2, a reducer 3 is screwed on the front side of the one-way valve body 4, and a sealing rubber ring 8 is provided between the reducer 3 and the one-way valve body 4.

[0041] In this embodiment, during installation, the positions of the one-way valve body 4, the reducer three 5 and the reducer one 1 can be adjusted according to the working environment for easy installation. When the fluid is introduced from the reducer two 3, when the pressure is relatively low, the fluid enters the one-way valve body 4 and cannot push the diaphragm assembly 9 supported by the return spring 10, thereby blocking the passage of the fluid and preventing leakage. When the pressure is relatively high, the fluid pushes the diaphragm assembly 9 to slide in the one-way valve body 4, and the diaphragm assembly 9 pushes the return spring 10. At this time, the diaphragm assembly 9 no longer blocks the passage of the fluid, and the fluid The fluid enters the three-way valve body 2 from the support frame 11 and reaches the three-way valve core 15. After being distributed by the three-way valve core 15, it flows out from the reducer 1 or the reducer 3 5. When the three-way is not needed, the output shaft of the driving motor 7 drives the three-way valve core 15 to rotate, and the three-way valve core 15 drives the movable blocking ring 14 to move and adjust its position to adjust the circulation and flow direction of the fluid. When the fluid is introduced from the reducer 1 or the reducer 3 5, the fluid pushes the diaphragm assembly 9 to contact the one-way valve body 4, blocking the fluid from passing through, thereby realizing one-way circulation.

[0042] The three-way valve body 2 is provided with three pipe interfaces 17 distributed in a T shape, each of which is provided with an internal thread 1, and each of which is provided with a three-way pipe 19. The three three-way pipes 19 intersect and communicate with each other inside the three-way valve body 2, and a valve core space is formed inside the three-way valve body 2. A driving interface 18 is provided at the upper end of the three-way valve body 2, and the connecting rod 6 is threadedly connected to the driving interface 18, and the driving interface 18 is connected to the valve core space.

[0043] In this embodiment, the pipe interface 17 and the internal thread 1 are used to connect the reducer 1 and the reducer 3 5 , and the valve core space and the drive interface 18 facilitate the installation of the three-way valve core 15 and the movable blocking ring 14 .

[0044] The one-way valve body 4 includes a connecting valve body 20 and a working valve body 21. A perforated spacer ring is provided between the working valve body 21 and the connecting valve body 20. A sliding limit tube, a wedge-shaped avoidance tube and a blocking ring 22 are provided in sequence from front to back inside the working valve body 21. An external thread 1 is provided at the outer rear end of the connecting valve body 20, and the external thread 1 cooperates with the internal thread 1. An internal thread 2 is provided inside the connecting valve body 20, and the specifications of the internal thread 2 and the internal thread 1 are consistent.

[0045] In this embodiment, the perforated spacer ring facilitates the installation of the diaphragm assembly 9, the external thread 1 cooperates with the internal thread 1, the sliding limit tube is used for the sliding of the diaphragm assembly 9 so that it has a certain opening pressure, the wedge-shaped avoidance ring facilitates the diaphragm assembly 9 to exit and enter the sliding limit tube, and the blocking ring 22 is used to install the support frame 11.

[0046] The support frame 11 includes a limit seat 25, and a plurality of brackets 23 evenly distributed around the circumference are provided on the outer side of the limit seat 25. A sliding hole 24 is opened on the sliding hole 24. Both ends of the bracket 23 extend out of the front and rear sides of the limit seat 25. The front extended part forms a spring mounting hole. The reset spring 10 is arranged in the spring mounting hole, and one end of the bracket 23 abuts against the blocking ring 22, and the other end of the bracket 23 abuts against the sealing gasket 12.

[0047] In this embodiment, the limit seat 25 and the sliding hole 24 facilitate the sliding of the diaphragm assembly 9, the spring mounting hole facilitates the fixing of the return spring 10, and a plurality of brackets 23 support the diaphragm assembly 9, limit the maximum pressure, and ensure pressure stability.

[0048] The diaphragm assembly 9 includes a movable rod 28, which is slidably set in the sliding hole 24. A circular diaphragm 27 is provided at the end of the movable rod 28, and a flexible rubber ring 26 is provided on the outer side of the circular diaphragm 27. The circular diaphragm 27 is slidably set in the sliding limit tube, and the flexible rubber ring 26 abuts against the sliding limit tube.

[0049] In this embodiment, when the pressure of the fluid introduced from the front side of the one-way valve body 4 is relatively small, the fluid pushes the circular diaphragm 27, the circular diaphragm 27 slides in the sliding limit tube, and under the support of the reset spring 10, does not withdraw from the sliding limit tube, blocking the passage of the fluid; when the pressure of the introduced fluid is relatively large, the fluid pushes the circular diaphragm 27, compresses the reset spring 10, the circular diaphragm 27 withdraws from the sliding limit tube and enters the wedge-shaped avoidance tube, no longer blocking the passage of the fluid; when the fluid is introduced from the rear side of the one-way valve body 4, the fluid pushes the circular diaphragm 27, the circular diaphragm 27 contacts the one-way valve body 4, blocking the passage of the fluid.

[0050] The movable blocking ring 14 is arranged in the valve core space. A pushing groove 30 and three valve core through holes 29 are formed on the movable blocking ring 14. The aperture of the valve core through hole 29 is the same as the inner diameter of the three-way pipe 19.

[0051] In this embodiment, the pushing groove 30 facilitates pushing the movable blocking ring 14 to move, adjusts the relative positions of the three valve core through holes 29, and thus controls the closing and opening of the valve core through hole 29.

[0052] The three-way valve core 15 is provided with three valve core through holes 2 32 , the valve core through hole 2 32 has the same aperture as the valve core through hole 1 29 , the valve core through hole 2 32 corresponds to the position of the valve core through hole 1 2 , and the three valve core through holes 2 32 intersect and communicate inside the three-way valve core 15 , one of the valve core through holes 2 32 is provided with a push tube 31 , and the push tube 31 is located in the push groove 30 , and the end face of the push tube 31 is flush with the outer end face of the movable blocking ring 14 .

[0053] In this embodiment, the pushing tube 31 pushes the pushing groove 30, adjusts the relative position of the three-way valve core 15 and the movable blocking ring 14, controls the connection and closing of the three valve core through holes 2 32 and the three valve core through holes 1 29, and adjusts the position relative to the three three-way pipes 19, thereby controlling the circulation and flow direction of the fluid.

[0054] An outer side of one end of the reducer 1 is provided with an outer thread 2, and an inner side of the other end of the reducer 1 is provided with an inner thread 3. The outer diameter of one end of the reducer 1 is the same as the inner diameter of the pipe interface 17.

[0055] The structure of the reducer 2 3 is the same as that of the reducer 1 1 , the outer diameter of one end of the reducer 2 3 is the same as the inner diameter of the pipeline interface 17 , and the inner diameter of the other end of the reducer 2 3 is different from the inner diameter of the other end of the reducer 1 1 ;

[0056] The structure of reducer 35 is the same as that of reducer 1. The outer diameter of one end of reducer 35 is the same as the inner diameter of the pipeline interface 17, and the inner diameter of the other end of reducer 35 is different from the inner diameter of the other end of reducer 1.

[0057] In this embodiment, reducer 1, reducer 2 3 and reducer 3 5 are used to connect external pipelines with different diameters, which is convenient for the installation and use of the three-way valve.

[0058] Working principle of the utility model: during installation, the positions of the one-way valve body 4, the reducer three 5 and the reducer one 1 can be adjusted according to the working environment, which is convenient for installation. The fluid is introduced from the reducer two 3. When the pressure is relatively low, the fluid enters the one-way valve body 4, and the fluid pushes the circular diaphragm 27. The circular diaphragm 27 slides in the sliding limit tube and does not withdraw from the sliding limit tube under the support of the reset spring 10, thereby blocking the passage of the fluid. When the pressure is relatively high, the fluid pushes the circular diaphragm 27, compresses the reset spring 10, and the circular diaphragm 27 withdraws from the sliding limit tube and enters the wedge-shaped avoidance tube. At this time, the passage of the fluid is no longer blocked, and the fluid enters the three-way valve body 2 from the support frame 11, reaches the three-way valve core 15, and is distributed from the reducer one 1 or The reducer 3 5 flows out, that is, when the three-way is not needed, the output shaft of the driving motor 7 drives the three-way valve core 15 to rotate, and the three-way valve core 15 drives the movable blocking ring 14 to move and adjust the position, that is, the output shaft of the driving motor 7 drives the three-way valve core 15, and the three-way valve core 15 drives the pushing tube 31 to push the pushing groove 30, adjust the relative position of the three-way valve core 15 and the movable blocking ring 14, control the connection and closing of the three valve core through holes 2 32 and the three valve core through holes 1 29, and adjust the position relative to the three three-way pipes 19 at the same time, so as to control the circulation and flow direction of the fluid. When the fluid is introduced from the reducer 1 or the reducer 3 5, the fluid pushes the circular diaphragm 27, and the circular diaphragm 27 contacts the one-way valve body 4, thereby blocking the fluid from passing through and realizing one-way circulation.

[0059] In summary, the three-way valve body 2 cooperates with the reducer 3 5, the reducer 2 3 and the reducer 1 to connect external pipes with different diameters, which is convenient for use;

[0060] By cooperating with the three-way valve body 2 and the one-way valve body 4, the position of the one-way valve body 4 can be adjusted, and the outer diameter of the pipe connected to the reducer 2 3 can be adjusted, which has a wide range of applications;

[0061] The one-way valve body 4 cooperates with the diaphragm assembly 9, the return spring 10 and the support frame 11 to limit the valve opening pressure range, prevent leakage, and control the flow direction of the fluid to achieve one-way circulation;

[0062] By driving the motor 7 to cooperate with the three-way valve body 2, the three-way valve core 15 and the movable blocking ring 14, the relative positions of the three-way valve core 15 and the movable blocking ring 14 are adjusted to control the circulation and flow direction of the fluid.

[0063] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A variable diameter three-way valve, comprising a three-way valve body (2), characterized in that: The three-way valve body (2) is provided with a three-way valve core (15) and a movable blocking ring (14) inside, and the movable blocking ring (14) is sleeved on the outside of the three-way valve core (15). A connecting rod (6) is screwed to the upper end of the three-way valve body (2), and a sealing gasket (2) (16) is provided between the connecting rod (6) and the three-way valve body (2). A driving motor (7) is fixed to the upper end of the connecting rod (6), and the output shaft of the driving motor (7) passes through the connecting rod (6) and extends into the three-way valve body (2) and is fixedly connected to the three-way valve core (15). A reducing joint (1) and a reducing joint (3) (5) are screwed to the left and right sides of the three-way valve body (2), respectively, and a reducing joint (1) and a reducing joint (2) are provided between the reducing joint (1) and the three-way valve body (2) and between the reducing joint (3) and the three-way valve body (2), respectively. A second sealing rubber ring (13) is provided, a one-way valve body (4) is screwed to the front side of the three-way valve body (2), a diaphragm assembly (9), a return spring (10), a support frame (11) and a sealing gasket (12) are provided in sequence from front to back inside the one-way valve body (4), and the diaphragm assembly (9) is slidably arranged in the one-way valve body (4), the return spring (10) is sleeved on the diaphragm assembly (9), the rear side of the return spring (10) abuts against the support frame (11), the support frame (11) abuts against the sealing gasket (12), and the sealing gasket (12) abuts against the three-way valve body (2), a second reducing joint (3) is screwed to the front side of the one-way valve body (4), and a first sealing rubber ring (8) is provided between the second reducing joint (3) and the one-way valve body (4).

2. A variable diameter three-way valve according to claim 1, characterized in that: The three-way valve body (2) is provided with three pipe interfaces (17) distributed in a T-shape, each of the pipe interfaces (17) is provided with an internal thread, each of the pipe interfaces (17) is provided with a three-way pipe (19), the three three-way pipes (19) intersect and communicate with each other inside the three-way valve body (2), and a valve core space is formed inside the three-way valve body (2), a drive interface (18) is provided at the upper end of the three-way valve body (2), a connecting rod (6) is threadedly connected to the drive interface (18), and the drive interface (18) is connected to the valve core space.

3. A variable diameter three-way valve according to claim 2, characterized in that: The one-way valve body (4) comprises a connecting valve body (20) and a working valve body (21); a spacer ring with a hole is provided between the working valve body (21) and the connecting valve body (20); a sliding limit tube, a wedge-shaped avoidance tube and a blocking ring (22) are provided in sequence from front to back inside the working valve body (21); an outer rear end of the connecting valve body (20) is provided with an external thread 1, the external thread 1 being matched with an internal thread 1; and an internal thread 2 is provided inside the connecting valve body (20), the specification of the internal thread 2 being consistent with that of the internal thread 1.

4. A variable diameter three-way valve according to claim 3, characterized in that: The support frame (11) comprises a limit seat (25), a plurality of brackets (23) evenly distributed around the circumference are arranged on the outer side of the limit seat (25), a sliding hole (24) is opened on the sliding hole (24), both ends of the bracket (23) extend out of the front and rear sides of the limit seat (25), the front extended part forms a spring mounting hole, the return spring (10) is arranged in the spring mounting hole, and one end of the bracket (23) abuts against the blocking ring (22), and the other end of the bracket (23) abuts against the sealing gasket (12).

5. A variable diameter three-way valve according to claim 4, characterized in that: The diaphragm assembly (9) comprises a movable rod (28) which is slidably disposed in the sliding hole (24); a circular diaphragm (27) is disposed at the end of the movable rod (28); a flexible rubber ring (26) is disposed on the outer side of the circular diaphragm (27); the circular diaphragm (27) is slidably disposed in the sliding limit tube, and the flexible rubber ring (26) abuts against the sliding limit tube.

6. A variable diameter three-way valve according to claim 5, characterized in that: The movable blocking ring (14) is arranged in the valve core space. The movable blocking ring (14) is provided with a pushing groove (30) and three valve core through holes (29). The diameter of the valve core through hole (29) is the same as the inner diameter of the three-way pipe (19).

7. A variable diameter three-way valve according to claim 6, characterized in that: The three-way valve core (15) is provided with three valve core through holes (2) (32), the valve core through holes (2) (32) having the same aperture as the valve core through hole (29), the positions of the valve core through holes (32) and the valve core through holes (29) corresponding to each other, and the three valve core through holes (2) intersect and communicate with each other inside the three-way valve core (15), one of the valve core through holes (2) (32) is provided with a push tube (31), and the push tube (31) is located in the push groove (30), and the end surface of the push tube (31) is flush with the outer end surface of the movable blocking ring (14).

8. The variable diameter three-way valve according to claim 7, characterized in that: The outer side of one end of the reducer (1) is provided with an external thread (2), and the inner side of the other end of the reducer (1) is provided with an internal thread (3); the outer diameter of one end of the reducer (1) is the same as the inner diameter of the pipeline interface (17); The structure of the reducer joint 2 (3) is the same as that of the reducer joint 1 (1), the outer diameter of one end of the reducer joint 2 (3) is the same as the inner diameter of the pipe joint 17, and the inner diameter of the other end of the reducer joint 2 (3) is different from the inner diameter of the other end of the reducer joint 1 (1); The structure of the reducer joint three (5) is the same as that of the reducer joint one (1), the outer ring pipe diameter of one end of the reducer joint three (5) is the same as the inner ring pipe diameter of the pipeline interface (17), and the inner ring pipe diameter of the other end of the reducer joint three (5) is different from the inner ring pipe diameter of the other end of the reducer joint one (1).

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