CN210949914U - Multifunctional butterfly valve for steam turbine - Google Patents

Abstract

The utility model relates to a multifunctional butterfly valve for steam turbine, comprising a butterfly valve and a control device; the utility model is characterized in that: the control device is composed of a cylinder and a pressure control valve; the pressure control valve adopts a spring-type safety valve, and the spring-type safety valve comprises a control valve body , valve cover and pressure setting device, use the medium pressure of the butterfly valve inlet channel to control the state of the cylinder through the pressure control valve, and automatically control the opening or closing of the butterfly valve, which has the characteristics of small size, simple structure and low cost. It is suitable for multi-function butterfly valves used to protect equipment safety on system medium pipelines such as steam turbines, water turbines, and pump shafts.

Description

Multifunctional butterfly valve for steam turbine

technical field

The utility model belongs to the field of valves, in particular to a butterfly valve. The utility model is suitable for the multifunctional butterfly valve used for protecting the safety of the equipment on the gas medium pipeline of the steam turbine system.

Background technique

On the medium conveying pipeline of the steam turbine system, in addition to the opening and closing valves for fluid on-off control, it is also necessary to install quick-closing and slow-closing check valves to prevent the backflow of the medium. At present, hydraulically controlled butterfly valves are commonly used in steam turbine systems. The structure consists of a hydraulic station and a butterfly valve. The hydraulic station controls the opening or closing of the butterfly valve to realize the on and off control and check control functions of the fluid. Its main disadvantages are complex structure, large product volume and high manufacturing cost.

SUMMARY OF THE INVENTION

Aiming at the shortcomings of the prior art, the utility model provides a multifunctional butterfly valve for steam turbines with simple structure, small volume and low manufacturing cost, which utilizes the pipeline medium to automatically control the opening, closing and non-return functions of the butterfly valve.

The technical scheme of the utility model includes a butterfly valve and a control device. The butterfly valve includes a valve body, a butterfly plate and a valve stem; it is characterized in that the control device is composed of a cylinder and a pressure control valve; the cylinder includes a cylinder block and a piston, and the cylinder block consists of a left cylinder block. It is composed of the right cylinder and the left piston. The left piston and the right piston are respectively installed in the inner cavity of the left cylinder and the right cylinder. The opposite planes of the two are fixedly connected by the piston rod, and the middle of the piston rod passes through the transmission device. It is connected with the valve stem, and a thrust spring is installed in the rodless cavity of the right cylinder body; the pressure control valve adopts a spring-type safety valve, which includes a control valve body, a valve cover and a pressure setting device, and the control valve body cavity is connected to the inlet, Control port and discharge port, the inlet is communicated with the valve body inlet channel through the pipeline, the pressure setting device is installed in the inner cavity of the valve cover, and its structure includes the ejector rod, the spring and the adjusting nut; the control port is communicated with the rodless cavity of the left cylinder body through the pipeline, The valve disc is set at the inlet of the control valve body cavity, an axial guide hole is arranged between the control valve body cavity and the valve cover cavity, the discharge port is located on the side wall of the axial guide hole, and the lower end of the ejector rod is in contact with the center of the upper end face of the valve disc. The lower plane of the valve disc is provided with a sealing surface that cooperates with the upper end face of the inlet, and the upper plane of the valve disc is provided with a sealing surface that cooperates with the lower end face of the axial guide hole.

In the above technical solution, an axial guide fit is adopted between the ejector rod and the axial guide hole, and an axial flow channel connecting the cavity of the control valve body and the discharge port is provided between the mating surfaces of the two; the valve flap is movably embedded. In the guide hole between the inner cavity of the control valve body and its inlet, an axial flow channel is arranged between the outer cylindrical surface of the valve disc and the guide hole.

In the above technical solution, a guide post is arranged in the axial guide hole, the lower end of the ejector rod is top mounted on the center of the upper end face of the guide post, the ejector post is installed between the center of the lower end face of the guide post and the center of the upper end face of the valve disc, and the outer cylindrical surface of the guide post is connected to the center of the upper end face of the valve disc. Between the axial guide holes is an axial flow channel that communicates with the control valve body cavity and the discharge port; the valve disc is movably embedded in the guide hole between the control valve body cavity and its inlet, and the outer cylindrical surface of the valve disc and the guide hole are connected. Axial flow channels are arranged between them.

In the above technical solution, the upper end of the ejector rod is provided with a valve opening locking device and a valve closing locking device.

In the above technical solution, the valve-opening locking device is composed of a valve-opening solenoid valve and a valve-opening connecting rod, the left end of the valve-opening connecting rod is hingedly installed on the valve cover, and the middle part of the valve-opening connecting rod is located in the lifting rod fixedly installed on the ejector rod. Below the nut, the right end of the valve opening link is hinged with the lower end of the driving rod of the valve opening solenoid valve; the valve closing locking device is composed of the valve closing solenoid valve and the valve closing link, and the left end of the valve closing link is driven by the valve closing solenoid valve. The lower end of the rod is hinged, the middle of the valve closing rod is hingedly installed on the valve cover, the right end of the valve closing rod is located directly above the ejector rod, the valve body of the valve closing solenoid valve and the valve body of the valve opening solenoid valve are fixed on the valve body through the mounting plate.

In the above technical solution, the transmission device is composed of a shift fork fixed on the upper end of the valve rod and a shift rod vertically fixed in the middle of the piston rod, and the shift rod is movably nested in the fork opening of the shift fork.

Compared with the prior art, the beneficial effect of the utility model is as follows: the control device of the butterfly valve is composed of a cylinder and a pressure control valve, and the medium pressure of the inlet passage of the valve body is used to control the state of the cylinder through the pressure control valve, and the opening or closing of the butterfly valve is automatically controlled. , has the characteristics of small size, simple structure and low cost.

Description of drawings

Figure 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic structural diagram of the cylinder in FIG. 1 of the present invention.

1. Valve body, 2. Disc, 3. Valve stem, 4. Left cylinder, 5. Right cylinder, 6. Left piston, 7. Right piston, 8. Piston rod, 9. Thrust spring, 10. Dial Rod, 11, Fork, 12, Control valve body, 13, Bonnet, 14, Inlet, 1, 5, Control port, 16, Discharge port, 17, Top rod, 18, Spring, 19, Adjusting nut, 20, Disc, 21, guide column, 22, top column, 23, valve opening solenoid valve, 24, valve opening connecting rod, 25, valve closing solenoid valve, 26, valve closing connecting rod, 27, lifting nut.

Detailed ways

As shown in Figure 1, the multifunctional butterfly valve for steam turbine includes a butterfly valve and a control device. The butterfly valve includes a valve body 1, a butterfly plate 2 and a valve stem 3. The butterfly valve adopts a triple eccentric structure; it is characterized in that the control device consists of a cylinder and a pressure control valve. The cylinder consists of a cylinder block and a piston. The cylinder block consists of a left cylinder block 4 and a right cylinder block 5. The piston consists of a left piston 6 and a right piston. The left piston 6 and the right piston 7 are respectively installed in the left cylinder block 4 and the right cylinder. The inner cavity of the body 5, the opposite planes of the two are fixedly connected by the piston rod 8, so that the left piston 6 and the right piston 7 form a linkage structure. The thrust spring 9 is installed inside. When there is no pressure in the rodless cavity of the left cylinder block 4, the thrust spring 9 pushes the left piston 6 and the right piston 7 to move to the right, the piston rod 8 drives the valve rod 3 to rotate counterclockwise, and the disc 2 closed; the pressure control valve adopts a spring-type safety valve. The spring-type safety valve includes a control valve body 12, a valve cover 13 and a pressure setting device. The valve cover 13 is fixedly installed on the upper end of the valve body 12, and the inner cavity of the control valve body 12 is connected to the inlet 14. , control port 15 and discharge port 16, the inlet 14 is communicated with the inlet channel of the valve body 1 through a pipeline, the pressure setting device is installed in the inner cavity of the valve cover 13, and its structure includes a push rod 17, a spring 18 and an adjusting nut 19. The adjusting nut 19 consists of The outer thread is threaded with the inner screw hole at the center of the upper end of the valve cover, the upper end of the ejector rod 17 extends through the center hole of the adjusting nut 19 to the upper end face of the adjusting nut 19, and the spring 18 is installed between the upper and lower spring seats on the ejector rod 17, The lower end of the adjusting nut 19 is pressed against the upper plane of the upper spring seat; the control port 15 is communicated with the rodless cavity of the left cylinder block 4 through a pipeline, and a valve flap 20 is arranged at the inlet of the inner cavity of the control valve body 12, and the inner cavity of the control valve body 12 is connected with the rodless cavity of the left cylinder block 4. An axial guide hole is provided between the inner cavity of the valve cover 13. The discharge port 16 is located on the side wall of the axial guide hole and communicated with the axial guide hole. In top contact, the lower plane of the valve flap 20 is provided with a sealing surface that cooperates with the upper end surface of the inlet 14, and the upper plane of the valve flap 20 is provided with a sealing surface that cooperates with the lower end surface of the axial guide hole. When the medium pressure of the inlet channel of the valve body 1 is lower than the set pressure of the pressure setting device, the valve disc 20 is pressed and sealed with the upper sealing surface of the inlet 14 under the downward thrust of the ejector rod 17, and the rodless cavity of the left cylinder block 4 Through the control port 15, the inner cavity of the control valve body 12, the axial guide hole and the discharge port 16, the left piston 6 and the right piston 7 are on the left side under the thrust of the thrust spring 9, and the disc 2 is in a closed state; when the valve body 1 When the medium pressure of the inlet channel is greater than the set pressure of the pressure setting device, the valve disc 20 moves upward under the action of the medium pressure of the inlet 14, and the sealing surface of the upper plane and the sealing surface of the lower plane of the axial guide hole are sealed and cooperated with each other, and the control The inner cavity of the valve body 12 is separated from the discharge port 16. The inlet channel medium of the valve body 1 enters the rodless cavity of the left cylinder block 4 through the inlet 14 and the control port 15, and pushes the left piston 6 and the right piston 7 to overcome the elastic force of the thrust spring 9 to the right Moving, the butterfly plate 2 is opened, and the opening, closing and non-return functions of the butterfly valve are automatically controlled by the medium pressure of the inlet channel of the valve body 1. It is especially suitable for system conditions such as steam turbines, water turbines, and pumping stations. When the steam turbine, hydraulic turbine, and pumping station are turned on, the pressure of the inlet passage of valve body 1 rises, and the butterfly valve is automatically opened. When the steam turbine, hydraulic turbine, and pumping station stop, valve body 1 When the inlet channel loses pressure, the butterfly valve is automatically closed to prevent the backflow of the medium and protect the safety of steam turbines, water turbines, pumping stations and other equipment.

Axial guide fit is adopted between the ejector rod 17 and the axial guide hole, and an axial flow channel connecting the inner cavity of the control valve body 12 and the discharge port 16 is provided between the mating surfaces of the two. The axial flow channel controls the left The discharge speed of the medium pressure in the rodless cavity of the cylinder block 4 realizes the slow closing function of the butterfly valve; the valve flap 20 is movably embedded in the guide hole between the inner cavity of the control valve body 12 and its inlet 14, so that the valve flap 20 is in the guide hole. Moving up and down, an axial flow channel is arranged between the outer cylindrical surface of the valve flap 20 and the guide hole, so that when the valve flap 20 is opened, the medium of the inlet 14 enters the inner cavity of the control valve body 12 through the axial flow channel.

A guide column 21 is arranged in the axial guide hole, the lower end of the top rod 17 is mounted on the center of the upper end surface of the guide column 21, and the top column 22 is installed between the center of the lower end surface of the guide column 21 and the center of the upper end surface of the valve disc 20. The outer cylinder of the guide column 21 There is an axial flow channel connecting the inner cavity of the control valve body 12 and the discharge port 16 between the surface and the axial guide hole; the valve flap 20 is movably embedded in the guide hole between the inner cavity of the control valve body 12 and its inlet 14, An axial flow channel is arranged between the outer cylindrical surface of the valve disc 20 and the guide hole.

The upper end of the ejector rod 17 is provided with a valve opening locking device and a valve closing locking device.

The valve opening locking device is composed of a valve opening solenoid valve 23 and a valve opening connecting rod 24. The left end of the valve opening connecting rod 24 is hingedly installed on the valve cover 13, and the middle part of the valve opening connecting rod 24 is located in the lifting rod fixedly installed on the ejector rod 17. Below the nut 27, the right end of the valve-opening link 24 is hinged with the lower end of the drive rod of the valve-opening solenoid valve 23. When the valve-opening solenoid valve 23 is energized, the driving rod moves up to pull up the ejector rod 17, and the valve body 1 inlet channel medium The pressure only needs to be greater than the elastic force of the thrust spring 9 to open the butterfly valve; the valve closing locking device is composed of the valve closing solenoid valve 25 and the valve closing connecting rod 26, the left end of the valve closing connecting rod 26 and the lower end of the driving rod of the valve closing solenoid valve 25 Hinged, the middle of the valve closing rod 26 is hingedly installed on the valve cover 13, the right end of the valve closing rod 26 is located just above the ejector rod 17, when the valve closing solenoid valve 25 is energized, its driving rod moves up, and the valve closing rod 26 The left end rises and the right end presses down, pressing the ejector rod 17 and the valve disc 20 on the inlet 14, preventing the valve disc 20 from opening, locking the butterfly valve in a closed state, protecting the safety of equipment maintenance, and playing a multi-purpose maintenance valve. The valve-closing solenoid valve 25 and the valve-opening solenoid valve 23 are fixed to the control valve body 12 through a mounting plate. The valve-closing solenoid valve 25 and the valve-opening solenoid valve 23 can also use manual pull rods.

The transmission device is composed of a shift fork 11 fixed on the upper end of the valve rod 3 and a shift rod 10 vertically fixed in the middle of the piston rod 8 . When the piston rod 8 moves left and right, the valve rod 3 is driven to rotate 90º through the fork 11.

Claims (7)

1. A multifunctional butterfly valve for a steam turbine, comprising a butterfly valve and a control device, wherein the butterfly valve comprises a valve body (1), a butterfly plate (2) and a valve stem (3); it is characterized in that: the control device is composed of a cylinder and a pressure control valve; The cylinder includes a cylinder block and a piston. The cylinder block consists of a left cylinder block (4) and a right cylinder block (5). The piston consists of a left piston (6) and a right piston (7). The left piston (6) and the right piston (7) ) are respectively installed in the inner cavity of the left cylinder block (4) and the right cylinder block (5), the opposite planes of the two are fixedly connected through the piston rod (8), and the middle part of the piston rod (8) is connected with the valve rod (3) through the transmission device , A thrust spring (9) is installed in the rodless cavity of the right cylinder block (5); the pressure control valve adopts a spring-type safety valve, which includes a control valve body (12), a valve cover (13) and a pressure setting device , the inner cavity of the control valve body (12) is connected to the inlet (14), the control port (15) and the discharge port (16), the inlet (14) is connected to the inlet passage of the valve body (1) through a pipeline, and the pressure setting device is installed on the valve cover (13) Inner cavity, the structure of which includes ejector rod (17), spring (18) and adjusting nut (19); the control port (15) is communicated with the rodless cavity of the left cylinder block (4) through a pipeline, and the control valve body (12) ) The inlet (14) of the inner cavity is provided with a valve flap (20), an axial guide hole is provided between the inner cavity of the control valve body (12) and the inner cavity of the valve cover (13), and the discharge port (16) is located in the axial guide The side wall of the hole is communicated with the axial guide hole. The lower end of the ejector rod (17) passes through the axial guide hole and touches the center of the upper end face of the valve disc (20). The lower plane of the valve disc (20) is provided with an inlet (14). The upper surface of the valve flap (20) is provided with a sealing surface that cooperates with the lower end surface of the axial guide hole. 2. The multifunctional butterfly valve for a steam turbine according to claim 1, characterized in that an axial guide fit is adopted between the ejector rod (17) and the axial guide hole, and a communication control valve is provided between the mating surfaces of the two. The axial flow channel between the inner cavity of the body (12) and the discharge port (16); the valve disc (20) is movably embedded in the guide hole between the inner cavity of the control valve body (12) and its inlet (14), and the valve disc ( 20) An axial flow channel is arranged between the outer cylindrical surface and the guide hole. 3. The multifunctional butterfly valve for a steam turbine according to claim 1, characterized in that: a guide column (21) is arranged in the axial guide hole, and the lower end of the ejector rod (17) is top mounted on the center of the upper end face of the guide column (21), A top column (22) is installed between the center of the lower end surface of the guide column (21) and the center of the upper end surface of the valve disc (20), and a communication control valve body (12) is provided between the outer cylindrical surface of the guide column (21) and the axial guide hole. The axial flow channel between the inner cavity and the discharge port (16); the valve disc (20) is movably embedded in the guide hole between the inner cavity of the control valve body (12) and its inlet (14), and the outer cylinder of the valve disc (20) An axial flow channel is arranged between the surface and the guide hole. 4. The multifunctional butterfly valve for steam turbine according to claim 1, 2 or 3, wherein the upper end of the ejector rod (17) is provided with a valve opening locking device and a valve closing locking device. 5. The multifunctional butterfly valve for steam turbine according to claim 4, wherein the valve opening locking device is composed of a valve opening solenoid valve (23) and a valve opening connecting rod (24), and the valve opening connecting rod (24) The left end is hingedly mounted on the valve cover (13), the middle of the valve opening link (24) is located below the lifting nut (27) fixed on the top rod (17), and the right end of the valve opening link (24) is connected to the valve opening solenoid The lower end of the drive rod of the valve (23) is hinged; the valve closing locking device is composed of a valve closing solenoid valve (25) and a valve closing connecting rod (26), and the left end of the valve closing connecting rod (26) is connected to the valve closing solenoid valve (25) The lower end of the drive rod is hinged, the middle of the valve closing rod (26) is hingedly installed on the valve cover (13), the right end of the valve closing rod (26) is located just above the ejector rod (17), the valve closing solenoid valve (25) and the opening The valve solenoid valve (23) is fixed on the valve body (1) through a mounting plate. 6. The multifunctional butterfly valve for steam turbines according to claim 1 or 2 or 3 or 5, characterized in that: the transmission device consists of a shift fork (11) fixed on the upper end of the valve rod (3) and vertically fixed on the piston rod (8) The middle lever (10) is formed, and the lever (10) is movably nested in the fork opening of the fork (11). 7. The multifunctional butterfly valve for steam turbine according to claim 4, wherein the transmission device consists of a fork (11) fixed on the upper end of the valve rod (3) and a dial vertically fixed in the middle of the piston rod (8). The lever (10) is formed, and the lever (10) is movably nested in the fork opening of the fork (11).

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