A hydraulic turbine wicket gate end face seal system and method

Abstract

A kind of water turbine movable guide vane end face sealing system and method, including guide vane end face sealing structure, guide vane end face sealing structure is respectively installed on the top cover and bottom ring of water turbine, guide vane end face sealing structure is used to form water seal with the end face of movable guide vane when movable guide vane is closed, guide vane end face sealing structure includes sealing block, top cover and bottom ring are respectively provided with sealing groove, sealing block sliding seal is installed in sealing groove, the bottom of sealing groove is provided with pressure hole, pressure hole is connected with pressure supply system by pressure supply pipeline, the outside of movable guide vane is also provided with pressure measuring hole, pressure measuring hole is connected with pressure supply system by pressure measuring pipeline, pressure supply system controls the on-off of pressure supply pipeline by the pressure in pressure measuring pipeline.The on-off of pressure supply pipeline is controlled by the water pressure of the outside of movable guide vane, so that pressure supply pipeline can be self-adaptively started, the control of pressure supply pipeline and the problem of sealing leakage are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydroelectric power station water turbine generator, and particularly relates to a water turbine movable guide vane end face sealing system and method. BACKGROUND

[0002] The movable guide vane sealing in the water turbine guide vane mechanism includes the sealing of the upper and lower end faces of the guide vane, and there are two sealing structures of metal sealing and non-metal sealing. The metal sealing is a tight contact type sealing between the guide vane and the bottom ring and between the guide vane and the top cover, and the metal rigid contact between the guide vane and the bottom ring and between the guide vane and the top cover realizes the sealing effect when the guide vane is fully closed. This sealing form has high requirements for the airfoil structure of the movable guide vane, is difficult to manufacture and process, and needs to be processed again after research and development during on-site installation. On the other hand, after long-term use, the guide vane is deformed under the action of water pressure and cavitation, the theoretical sealing point deviates from the actual sealing point, and the reliability of the guide vane sealing is reduced. The non-metal structure sealing is to set a non-metal sealing element at the guide vane and the bottom ring and at the guide vane and the top cover to realize the sealing effect by generating a large compression amount, for example, the sealing device for improving the sealing performance of the guide vane end face disclosed in CN214499290U. Although this sealing structure has good sealing effect, the movable guide vane sealing structure of the water turbine set using the non-metal sealing structure often appears damage and crushing of the sealing element due to repeated extrusion and friction, resulting in leakage.

[0003] In addition, the Chinese patent document CN110685844A, published on January 14, 2020, discloses a water turbine movable guide vane end face sealing structure, which introduces pressure-adjustable medium into the end face sealing part A through a pipeline to deform the end face sealing strip, so as to push the end face sealing block to have a tendency to move towards the movable guide vane to complete the sealing of the movable guide vane, but does not solve how to adaptively control the pipeline. SUMMARY

[0004] The technical problem to be solved by the present application is to solve the problems in the above background art, and to provide a water turbine movable guide vane end face sealing system, which solves the problems of control of the pressure supply pipeline and sealing leakage.

[0005] Another technical problem to be solved by the present application is to provide a method using the water turbine movable guide vane end face sealing system to realize adaptive sealing of the sealing block and the end face of the movable guide vane.

[0006] In order to realize the above technical features, the application is implemented as follows: a water turbine movable guide vane end face sealing system, comprising guide vane end face sealing structures, which are respectively installed on a top cover and a bottom ring of the water turbine, and are used to form a water seal with the end face of the movable guide vane when the movable guide vane is closed, wherein the guide vane end face sealing structure comprises a sealing block, the top cover and the bottom ring are respectively provided with a sealing groove, the sealing block is installed in the sealing groove, the bottom of the sealing groove is provided with a pressure hole, the pressure hole is connected with a pressure supply system through a pressure supply pipeline, the outer side of the movable guide vane is further provided with a pressure measuring hole, a pressure sensor is installed on the pressure measuring pipeline connected with the pressure measuring hole, and the pressure supply system controls the opening and closing and pressure relief of the pressure supply pipeline through the pressure sensor.

[0007] The lower side of the sealing block is provided with a pressure cavity.

[0008] A gas bag is installed in the pressure cavity, and a pressure charging nozzle of the gas bag is connected with the pressure hole.

[0009] The upper end of the pressure hole is provided with a mounting hole, the pressure charging nozzle of the gas bag is inserted into the mounting hole, and the outer circumferential wall of the pressure charging nozzle is sealingly connected and fixed with the mounting hole.

[0010] The two sides of the sealing block are further respectively provided with a pressing block, the lower end of the side of the pressing block close to the sealing block is provided with a limiting sliding groove, the lower end of the side of the sealing block close to the pressing block is provided with a protruding part, the limiting sliding groove of the pressing block is matched with the protruding part of the sealing block to limit the sealing block in the sealing groove, and the pressing block is connected with the top cover or the bottom ring through bolts.

[0011] The top of the limiting sliding groove of the pressing block is spaced apart from the top of the protruding part of the sealing block by a distance, and the protruding part of the sealing block can slide up and down in the limiting sliding groove by a distance.

[0012] The pressure supply system comprises a first electromagnetic valve, the first electromagnetic valve is electrically connected with the pressure sensor, the inlet end of the first electromagnetic valve is connected with a gas source pipeline, and the outlet end of the first electromagnetic valve is connected with the pressure supply pipeline through a gas supply pipeline; a pressure relief electromagnetic valve is further installed on the pressure supply pipeline, the pressure relief electromagnetic valve is electrically connected with the pressure sensor or a controller for controlling the opening and closing of the movable guide vane.

[0013] A hydraulic system is further installed on the pressure supply system, the hydraulic system comprises a plug-in valve, the pressure control end of the plug-in valve is connected with the gas supply pipeline through a control pipeline, the inlet end of the plug-in valve is connected with a high-pressure water pipeline, the outlet end of the plug-in valve is connected with the pressure supply pipeline through a hydraulic pipeline, a first one-way valve is installed on the gas supply pipeline, and a second one-way valve is installed on the hydraulic pipeline.

[0014] The hydraulic system further comprises a second electromagnetic valve, which is electrically connected with the pressure sensor, and the inlet end of the second electromagnetic valve is connected with the high-pressure water pipeline, and the outlet end of the second electromagnetic valve is connected with the inlet end of the cartridge valve.

[0015] A method for sealing the end face of a movable guide vane of a hydraulic turbine, comprising the following steps:

[0016] S1. installing the sealing blocks into the sealing grooves on the top cover or the bottom ring, respectively;

[0017] S2. connecting the pressure holes at the bottom of the sealing grooves on the top cover and the bottom ring with the pressure supply pipeline, respectively, and connecting the pressure measuring holes with the pressure measuring pipeline;

[0018] S3. when the movable guide vane is in the open state, the water pressure in the pressure measuring pipeline is low, the pressure sensor controls the first electromagnetic valve and the second electromagnetic valve to be closed through the controller, the compressed air in the air source pipeline cannot enter the air supply pipeline, and the high-pressure water in the high-pressure water pipeline cannot enter the hydraulic pipeline;

[0019] S4. when the movable guide vane is in the closed state, the water pressure in the pressure measuring pipeline is high, the pressure sensor controls the first electromagnetic valve and the second electromagnetic valve to be opened through the controller, the compressed air in the air source pipeline enters the air supply pipeline through the first electromagnetic valve, so that the pressure is transmitted to the pressure holes through the pressure supply pipeline, and the sealing blocks slide upward to abut against the end face of the movable guide vane to form a water seal; wherein the air pressure in the control pipeline controls the cartridge valve to be closed, and the high-pressure water cannot enter the hydraulic pipeline;

[0020] S5. when the movable guide vane is in the closed state, and the pressure of the compressed air in the air supply pipeline decreases to a threshold value, the air pressure in the control pipeline is also decreased, the cartridge valve is opened, the high-pressure water enters the hydraulic pipeline through the second electromagnetic valve and the cartridge valve, and then enters the pressure supply pipeline, so that the high-pressure water is transmitted to the pressure holes;

[0021] S6. when the movable guide vane is opened from the closed state, wherein when the pressure relief electromagnetic valve is electrically connected with the pressure sensor, the water pressure in the pressure measuring pipeline is reduced, the pressure sensor controls the pressure relief electromagnetic valve to be opened through the controller to relieve the pressure of the pressure supply pipeline; when the pressure relief electromagnetic valve is electrically connected with the controller for controlling the opening and closing of the movable guide vane, the pressure relief electromagnetic valve is controlled to be opened to relieve the pressure of the pressure supply pipeline, and the movable guide vane is also opened.

[0022] The present application has the following beneficial effects:

[0023] 1. By setting pressure measuring hole on the bottom ring outside the movable guide vane, pressure measuring pipe connected with the pressure measuring hole is installed with pressure sensor, pressure supply system controls the on-off and pressure relief of pressure supply pipe through the pressure sensor. When the movable guide vane is opened, the pressure in the pressure measuring pipe is small, the pressure supply system is not opened, at this time, there is no pressure in the pressure supply pipe, and there is no pressure on the lower side of the sealing block; when the movable guide vane is opened and closed, the pressure in the pressure measuring pipe is large, the pressure sensor starts the pressure supply system, at this time, the pressure supply pipe outputs pressure, and the lower side of the sealing block has pressure, so that the sealing block is expanded or pushed, so that the sealing block is in close contact with the end surface of the movable guide vane, thereby forming water seal. The water pressure outside the movable guide vane controls the pressure supply system, thereby controlling the on-off and pressure relief of the pressure supply pipe, so that the pressure supply pipe can be started adaptively, and the control problem of the pressure supply pipe and the problem of excessive wear and leakage of the sealing block are solved.

[0024] 2. By setting the air bag, the sealing is better, the pressure output by the pressure supply pipe is not easy to leak, and when the air bag is inflated, the sealing block is expanded or moved upward to form a seal, when the air bag is not inflated, the sealing block is retracted and does not contact the end of the movable guide vane, reducing friction loss and prolonging the service life of the sealing block.

[0025] 3. The pressure supply system is also installed with a hydraulic system to provide standby working pressure for the sealing block, and the system is more stable. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a schematic view of the cross-sectional structure of the guide vane structure of the water turbine.

[0027] Figure 2 It is Figure 1 It is a schematic view of the cross-sectional structure of the guide vane structure of the water turbine.

[0028] Figure 3 It is Figure 2 It is a schematic view of the cross-sectional structure of the guide vane structure of the water turbine.

[0029] Figure 4 It is a schematic view of the cross-sectional structure of the guide vane structure of the water turbine.

[0030] In the figure: top cover 1, sealing groove 11, pressure hole 12, mounting hole 13, bottom ring 2, guide vane end surface sealing structure 3, sealing block 31, pressure cavity 32, protruding part 33, pressure block 34, limiting sliding slot 35, bolt 36, pressure measuring hole 4, air bag 5, pressure measuring pipe 6, pressure sensor 61, pressure supply pipe 7, pressure supply system 8, air source pipe 81, first electromagnetic valve 82, air supply pipe 83, first one-way valve 84, hydraulic system 9, high-pressure water pipe 91, second electromagnetic valve 92, cartridge valve 93, control pipe 94, hydraulic pipe 95, second one-way valve 96. DETAILED DESCRIPTION

[0031] The embodiments of the present application will be further described below with reference to the drawings.

[0032] Embodiment one

[0033] Referring to Figures 1-4 A water turbine movable guide vane end face sealing system, comprising guide vane end face sealing structures 3, which are respectively installed on a top cover 1 and a bottom ring 2 of a water turbine, and are used to form water sealing with the end face of a movable guide vane 10 when the movable guide vane 10 is closed, the guide vane end face sealing structure 3 comprises a sealing block 31, the top cover 1 and the bottom ring 2 are respectively provided with a sealing groove 11, the sealing block 31 is sealingly installed in the sealing groove 11, the bottom of the sealing groove 11 is provided with a pressure hole 12, the pressure hole 12 is connected with a pressure supply system 8 through a pressure supply pipeline 7, the outer side of the movable guide vane 10 is further provided with a pressure measuring hole 4, a pressure sensor 61 is installed on a pressure measuring pipeline 6 connected with the pressure measuring hole 4, and the pressure supply system 8 controls the opening and closing and pressure relief of the pressure supply pipeline 7 through the pressure sensor 61.

[0034] The pressure measuring hole 4 is provided on the outer side of the movable guide vane 10 on the bottom ring 2, the pressure measuring pipeline 6 connected with the pressure measuring hole 4 is provided with the pressure sensor 61, and the pressure supply system 8 controls the opening and closing and pressure relief of the pressure supply pipeline 7 through the pressure sensor 61. When the movable guide vane 10 is opened, the pressure in the pressure measuring pipeline 6 is small, the pressure supply system 8 is not opened, at this time, there is no pressure in the pressure supply pipeline 7, and there is no pressure on the lower side of the sealing block 31; when the movable guide vane 10 is closed, the pressure in the pressure measuring pipeline 6 is large, the pressure sensor 61 starts the pressure supply system 8, at this time, the pressure supply pipeline 7 outputs pressure, and there is pressure on the lower side of the sealing block 31, so that the sealing block 31 is expanded or pushed to make the sealing block 31 tightly contact with the end face of the movable guide vane 10, thereby forming water sealing. The water pressure outside the movable guide vane 10 controls the pressure supply system 8, thereby controlling the opening and closing and pressure relief of the pressure supply pipeline 7, so that the pressure supply pipeline 7 can be adaptively started, and the control problem of the pressure supply pipeline 7 and the problem of excessive wear and leakage of the sealing block 31 are solved.

[0035] Referring to Figure 3 The lower side of the sealing block 31 is provided with a pressure cavity 32. The pressure cavity 32 is provided to facilitate the expansion or pushing of the sealing block 31.

[0036] Further, an air bag 5 is installed in the pressure cavity 32, and a pressure charging nozzle of the air bag 5 is connected with the pressure hole 12. By providing the air bag 5, the sealing is better, the pressure output by the pressure supply pipeline 7 is not easy to leak, and when the air bag 5 is inflated, the sealing block 31 is expanded or moved upward to form sealing, when the air bag 5 is relieved, the sealing block 31 is retracted and does not contact with the end of the movable guide vane, thereby reducing friction loss and prolonging the service life of the sealing block 31. When the air bag 5 is not used, the sealing block 31 and the sealing groove 11 form sealing.

[0037] Further, the upper end of the pressure hole 12 is provided with a mounting hole 13, the inflation nozzle of the air bag 5 is inserted into the mounting hole 13, and the outer circumferential wall of the inflation nozzle is fixedly connected with the mounting hole 13 in a sealing manner, so that the installation is simple and convenient.

[0038] Referring to Figure 3 The two sides of the sealing block 31 are further respectively provided with a pressing block 34. The pressing block 34 is provided with a limiting sliding groove 35 at the lower end of the side close to the sealing block 31. The sealing block 31 is provided with a protruding portion 33 at the lower end of the side close to the pressing block 34. The limiting sliding groove 35 of the pressing block 34 cooperates with the protruding portion 33 of the sealing block 31 to limit the sealing block 31 in the sealing groove 11. The pressing block 34 is connected with the top cover 1 or the bottom ring 2 through a bolt 36. The sealing block 31 is limited by the pressing block 34, so that the sealing block 31 is prevented from being taken out under the action of water flow.

[0039] In the preferred embodiment, the top of the limiting sliding groove 35 of the pressing block 34 is spaced apart from the top of the protruding portion 33 of the sealing block 31 by a distance. The protruding portion 33 of the sealing block 31 can slide up and down in the limiting sliding groove 35 by a distance. After the upper end of the sealing block 31 is worn, the sealing block 31 can still move against the end of the movable guide vane, so that the service life of the sealing block 31 is prolonged, and the sealing performance of the sealing block 31 is better.

[0040] Referring to Figure 4 The pressure supply system 8 comprises a first electromagnetic valve 82. The first electromagnetic valve 82 is electrically connected with the pressure sensor 61. The inlet end of the first electromagnetic valve 82 is connected with the air source pipeline 81. The outlet end of the first electromagnetic valve 82 is connected with the pressure supply pipeline 7 through an air supply pipeline 83. The pressure supply pipeline 7 is further provided with a pressure relief electromagnetic valve 71. The pressure relief electromagnetic valve 71 is electrically connected with the pressure sensor 61 or a controller for controlling the opening and closing of the movable guide vane 10.

[0041] According to the relationship between flow rate and pressure, the greater the flow rate, the smaller the pressure, and the smaller the flow rate, the greater the pressure. When the movable guide vane 10 is fully closed, the water flow rate between the guide vanes is zero. At this time, the pressure of the pressure measuring hole 4 on the bottom ring 2 is the maximum, so the pressure in the pressure measuring pipeline 6 is the maximum. The pressure sensor 61 controls the first electromagnetic valve 82 and the second electromagnetic valve 92 to open through the controller. The compressed air in the air source pipeline 81 enters the air supply pipeline 83 through the first electromagnetic valve 82, so that the pressure is delivered to the pressure hole 12 through the pressure supply pipeline 7. The sealing block 31 expands or moves to form a water seal against the end surface of the movable guide vane 10. When the movable guide vane 10 is opened, the pressure of the pressure measuring hole 4 on the bottom ring 2 becomes smaller. The pressure sensor 61 controls the first electromagnetic valve 82 and the second electromagnetic valve 92 to close through the controller. The sealing block 31 is not pressurized. When the movable guide vane 10 is opened from the closed state, the pressure in the pressure supply pipeline 7 is relieved through the pressure relief electromagnetic valve 71, which can effectively prevent the sealing block 31 from being worn.

[0042] Further, the supply pressure system 8 is also provided with a hydraulic system 9, the hydraulic system 9 comprises a plug valve 93, the pressure control end of the plug valve 93 is connected with the air supply pipeline 83 through a control pipeline 94, the inlet end of the plug valve 93 is connected with a high-pressure water pipeline 91, the outlet end of the plug valve 93 is connected with the supply pressure pipeline 7 through a hydraulic pipeline 95, the air supply pipeline 83 is provided with a first one-way valve 84, and the hydraulic pipeline 95 is provided with a second one-way valve 96. When the pressure of the air supply pipeline 83 is reduced to a threshold value, the pressure in the control pipeline 94 is reduced, the plug valve 93 controls the high-pressure water pipeline 91 to be connected with the hydraulic pipeline 95, so as to provide standby working pressure for the sealing block 31, and the sealing system is more stable.

[0043] Specifically, when the air source pressure is insufficient or disappears, the pressure of the air supply pipeline 83 is reduced, and the pressure gauge on the air supply pipeline 83 will send an alarm signal. At this time, the pressure of the plug valve 93 disappears, the plug valve 93 is opened, the high-pressure water pipeline 91 is communicated with the hydraulic pipeline 95, and the high-pressure water enters the supply pressure pipeline 7 to provide pressure for the sealing block 31 or the air bag 5. The hydraulic system 9 can be automatically put into operation, and the air supply pipeline 83 is provided with the first one-way valve 84, so as to prevent the high-pressure water in the hydraulic pipeline 95 from returning along the air supply pipeline 83.

[0044] The hydraulic system 9 further comprises a second electromagnetic valve 92, the pressure control end of the second electromagnetic valve 92 is connected with the pressure measuring pipeline 6 through a connecting pipeline 62, the inlet end of the second electromagnetic valve 92 is connected with the high-pressure water pipeline 91, and the outlet end of the second electromagnetic valve 92 is connected with the inlet end pipeline of the plug valve 93. The second electromagnetic valve 92 is arranged to control the on-off of the high-pressure water pipeline 91, and the system is more stable.

[0045] Specifically, when the movable guide vane 10 is fully closed, the pressure in the pressure measuring pipeline 6 is the largest, the pressure sensor 61 controls the first electromagnetic valve 82 to be turned on, and the second electromagnetic valve 92 is also turned on. When the air pressure in the air supply pipeline 83 is sufficient, the plug valve 93 is closed under pressure, and only the air source pipeline 81 is connected with the air supply pipeline 83, so as to provide compressed air for the supply pressure pipeline 7; when the air pressure in the air supply pipeline 83 is lower than a threshold value, the pressure of the plug valve 93 disappears, the plug valve 93 is opened, the high-pressure water pipeline 91 is communicated with the hydraulic pipeline 95, and the high-pressure water enters the supply pressure pipeline 7 to provide pressure for the sealing block 31 or the air bag 5.

[0046] When the movable guide vane 10 is fully opened, the pressure in the pressure measuring pipeline 6 is reduced, the pressure sensor 61 controls the first electromagnetic valve 82 to be closed and the second electromagnetic valve 92 to be closed.

[0047] Embodiment two:

[0048] A method for adopting the movable guide vane end face sealing system of the water turbine, comprising the following steps:

[0049] The sealing blocks 31 are respectively installed into the sealing grooves 11 on the top cover 1 or the bottom ring 2.

[0050] The pressure holes 12 at the bottom of the sealing grooves 11 on the top cover 1 and the bottom ring 2 are respectively connected with the pressure supply pipeline 7; and the pressure measuring hole 4 is connected with the pressure measuring pipeline 6.

[0051] When the movable guide vane 10 is in the open state, the water pressure in the pressure measuring pipeline 6 is low, the pressure sensor 61 controls the first electromagnetic valve 82 and the second electromagnetic valve 92 to be closed through the controller, the compressed air in the air source pipeline 81 cannot enter the air supply pipeline 83, and the high-pressure water in the high-pressure water pipeline 91 cannot enter the hydraulic pipeline 95.

[0052] When the movable guide vane 10 is in the closed state, the water pressure in the pressure measuring pipeline 6 is high, the pressure sensor 61 controls the first electromagnetic valve 82 and the second electromagnetic valve 92 to be opened through the controller, the compressed air in the air source pipeline 81 enters the air supply pipeline 83 through the first electromagnetic valve 82, so as to deliver the pressure to the pressure hole 12 through the pressure supply pipeline 7, and the sealing block 31 slides upward to abut against the end surface of the movable guide vane 10 to form a water seal; wherein the gas pressure in the control pipeline 94 controls the plug-in valve 93 to be closed, and the high-pressure water cannot enter the hydraulic pipeline 95.

[0053] When the movable guide vane 10 is in the closed state, and the pressure of the compressed air in the air supply pipeline 83 is reduced to a threshold value, the gas pressure in the control pipeline 94 is also reduced, the plug-in valve 93 is opened, the high-pressure water enters the hydraulic pipeline 95 through the second electromagnetic valve 92 and the plug-in valve 93, and then enters the pressure supply pipeline 7, so as to deliver the high-pressure water to the pressure hole 12.

[0054] When the movable guide vane 10 is opened from the closed state, when the pressure relief electromagnetic valve 71 is electrically connected with the pressure sensor 61, the water pressure in the pressure measuring pipeline 6 is reduced, the pressure sensor 61 controls the pressure relief electromagnetic valve 71 to be opened through the controller to relieve the pressure of the pressure supply pipeline 7; when the pressure relief electromagnetic valve 71 is electrically connected with the controller for controlling the opening and closing of the movable guide vane 10, the pressure relief electromagnetic valve 71 is controlled to be opened to relieve the pressure of the pressure supply pipeline 7, and the movable guide vane 10 is opened at the same time, which can effectively prevent the sealing block 31 from being worn.

Claims

1. A water turbine movable guide vane end face sealing system, comprising guide vane end face sealing structures (3) mounted on a top cover (1) and a bottom ring (2) of a water turbine respectively, the guide vane end face sealing structures (3) being used to form a water seal with end faces of movable guide vanes (10) when the movable guide vanes (10) are closed, characterized in that: The guide vane end face sealing structure (3) comprises a sealing block (31), the lower side of the sealing block (31) is provided with a pressure cavity (32), the top cover (1) and the bottom ring (2) are respectively provided with a sealing groove (11), the sealing block (31) is sealed and installed in the sealing groove (11), the bottom of the sealing groove (11) is provided with a pressure hole (12), the pressure hole (12) is connected with the pressure supply system (8) through the pressure supply pipeline (7), the outer side of the movable guide vane (10) is further provided with a pressure measuring hole (4), the pressure measuring pipeline (6) connected with the pressure measuring hole (4) is provided with a pressure sensor (61), and the pressure supply system (8) controls the opening and closing and pressure relief of the pressure supply pipeline (7) through the pressure sensor (61). ​ The pressure supply system (8) comprises a first electromagnetic valve (82), the first electromagnetic valve (82) is electrically connected with the pressure sensor (61), the inlet end of the first electromagnetic valve (82) is connected with the gas source pipeline (81), and the outlet end of the first electromagnetic valve (82) is connected with the pressure supply pipeline (7) through the gas supply pipeline (83); the pressure supply pipeline (7) is further provided with a pressure relief electromagnetic valve (71), the pressure relief electromagnetic valve (71) is electrically connected with the pressure sensor (61) or a controller for controlling the opening and closing of the movable guide vane (10). The pressure supply system (8) is further provided with a hydraulic system (9), the hydraulic system (9) comprises an insertion valve (93), the pressure control end of the insertion valve (93) is connected with the gas supply pipeline (83) through a control pipeline (94), the inlet end of the insertion valve (93) is connected with a high-pressure water pipeline (91), the outlet end of the insertion valve (93) is connected with the pressure supply pipeline (7) through a hydraulic pipeline (95), the gas supply pipeline (83) is provided with a first check valve (84), and the hydraulic pipeline (95) is provided with a second check valve (96). The hydraulic system (9) further comprises a second electromagnetic valve (92), the second electromagnetic valve (92) is electrically connected with the pressure sensor (61), the inlet end of the second electromagnetic valve (92) is connected with the high-pressure water pipeline (91), and the outlet end of the second electromagnetic valve (92) is connected with the inlet end of the insertion valve (93).

2. A hydraulic turbine wicket gate end face seal system as claimed in claim 1, wherein: The pressure cavity (32) is provided with an air bag (5), and the pressure charging nozzle of the air bag (5) is connected with the pressure hole (12).

3. A hydraulic turbine wicket gate end face seal system as claimed in claim 2, wherein: The upper end of the pressure hole (12) is provided with a mounting hole (13), the pressure charging nozzle of the air bag (5) is inserted into the mounting hole (13), and the outer circumferential wall of the pressure charging nozzle is sealingly connected and fixed with the mounting hole (13).

4. A hydraulic turbine wicket gate end face seal system as claimed in any one of claims 1 to 3, wherein: The two sides of the sealing block (31) are further provided with pressing blocks (34), respectively, the lower end of the pressing block (34) on one side of the sealing block (31) is provided with a limiting sliding groove (35), the lower end of the sealing block (31) on one side of the pressing block (34) is provided with a protruding part (33), the limiting sliding groove (35) of the pressing block (34) is matched with the protruding part (33) of the sealing block (31), the sealing block (31) is limited in the sealing groove (11), and the pressing block (34) is connected with the top cover (1) or the bottom ring (2) through bolts (36).

5. A hydraulic turbine wicket gate end seal system as claimed in claim 4, wherein: The top of the limiting sliding groove (35) of the pressing block (34) is spaced apart from the top of the protruding part (33) of the sealing block (31), and the protruding part (33) of the sealing block (31) can slide up and down in the limiting sliding groove (35) by a distance.

6. A method of using the end face seal system for a wicket gate of a hydraulic turbine as defined in claim 1, characterized in that The method comprises the following steps: S1. installing the sealing block (31) into each sealing groove (11) on the top cover (1) or the bottom ring (2) respectively; S2. connecting the pressure holes (12) at the bottom of each sealing groove (11) on the top cover (1) and the bottom ring (2) with the pressure supply pipeline (7) respectively, and connecting the pressure measuring hole (4) with the pressure measuring pipeline (6); S3. when the movable guide vane (10) is in the open state, the water pressure in the pressure measuring pipeline (6) is low, the pressure sensor (61) controls the first electromagnetic valve (82) and the second electromagnetic valve (92) to be closed through the controller, the compressed air in the air source pipeline (81) cannot enter the air supply pipeline (83), and the high-pressure water in the high-pressure water pipeline (91) cannot enter the hydraulic pipeline (95); S4. when the movable guide vane (10) is in the closed state, the water pressure in the pressure measuring pipeline (6) is high, the pressure sensor (61) controls the first electromagnetic valve (82) and the second electromagnetic valve (92) to be opened through the controller, the compressed air in the air source pipeline (81) enters the air supply pipeline (83) through the first electromagnetic valve (82), so that the pressure is transmitted to the pressure hole (12) through the pressure supply pipeline (7), and the sealing block (31) slides upward to abut against the end face of the movable guide vane (10) to form a water seal; wherein the gas pressure in the control pipeline (94) controls the plug-in valve (93) to be closed, and the high-pressure water cannot enter the hydraulic pipeline (95); S5. when the movable guide vane (10) is in the closed state, and the pressure of the compressed air in the air supply pipeline (83) decreases to a threshold value, the gas pressure in the control pipeline (94) decreases at the same time, the plug-in valve (93) is opened, the high-pressure water enters the hydraulic pipeline (95) after passing through the second electromagnetic valve (92) and the plug-in valve (93), and then enters the pressure supply pipeline (7), so that the high-pressure water is transmitted to the pressure hole (12); S6. when the movable guide vane (10) is opened from the closed state, when the pressure relief electromagnetic valve (71) is electrically connected with the pressure sensor (61), the water pressure in the pressure measuring pipeline (6) decreases, the pressure sensor (61) controls the pressure relief electromagnetic valve (71) to be opened through the controller to relieve the pressure of the pressure supply pipeline (7); when the pressure relief electromagnetic valve (71) is electrically connected with the controller for controlling the opening and closing of the movable guide vane (10), the pressure relief electromagnetic valve (71) is controlled to be opened to relieve the pressure of the pressure supply pipeline (7), and the movable guide vane (10) is opened at the same time.

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