Speed regulator hydraulic system and combination valve inner leakage detection method thereof

Abstract

The invention discloses a speed regulator hydraulic system and a combination valve inner leakage detection method thereof.The speed regulator hydraulic system comprises an oil collecting tank, an oil pump, a combination valve and a main distribution system oil source pipeline, the input end of the oil pump communicates with the bottom of the oil collecting tank, and the combination valve comprises a loading and unloading valve, a loading and unloading electromagnetic valve, a safety valve and a check valve; the loading and unloading valve is provided with a first oil return opening, the loading and unloading electromagnetic valve is provided with a second oil return opening, the safety valve is covered with an oil collecting cover, and the first oil return opening, the second oil return opening, an outlet of the safety valve and an outlet of the oil collecting cover are all communicated with the oil collecting groove. According to the invention, oil leakage conditions of the first oil return port, the second oil return port, the outlet of the safety valve and the outlet of the oil collection cover at the communication position of the oil collection tank can be observed when entering the oil collection tank, and the oil leakage amount can be correspondingly measured; therefore, the internal leakage conditions of the loading and unloading valve, the loading and unloading electromagnetic valve, the safety valve and the safety valve body are determined, and internal leakage detection of the combination valve is facilitated.

Description

Technical Field

[0001] The present invention belongs to the technical field of governors, and particularly relates to a governor hydraulic system and a method for detecting internal leakage of a combined valve therein. Background Art

[0002] At present, the energy supply part of a governor hydraulic system generally includes a hydraulic pump and hydraulic auxiliary components such as a combined valve. Among them, if internal leakage occurs in the combined valve, it will affect the oil supply efficiency and speed regulation stability; therefore, it is necessary to detect the internal leakage of the combined valve in a timely manner on-site so as to detect whether there is internal leakage in the combined valve in time. However, it is difficult to detect the internal leakage of the combined valve in the existing governor hydraulic system due to its composition and liquid path connection relationship. Summary of the Invention

[0003] In order to overcome the defects of the prior art, the present invention provides a governor hydraulic system and a method for detecting internal leakage of a combined valve therein, which can facilitate the detection of internal leakage of the combined valve.

[0004] The object of the present invention is achieved by the following technical solutions:

[0005] In a first aspect, a governor hydraulic system is provided, which includes an oil collecting tank, a hydraulic pump, a combined valve, and a main distribution system oil source pipeline. The input end of the hydraulic pump is communicated with the bottom of the oil collecting tank. The combined valve includes a loading and unloading valve, a loading and unloading solenoid valve, a safety valve, and a check valve;

[0006] The loading and unloading valve is provided with a first oil inlet, a first oil return port, and a pressure chamber;

[0007] The loading and unloading solenoid valve is provided with a second oil inlet, a second oil return port, and a first working port;

[0008] The outer cover of the safety valve is provided with an oil collecting cover;

[0009] The output end of the hydraulic pump is communicated with the first oil inlet, the inlet of the safety valve, and the inlet of the check valve. The outlet of the check valve is communicated with the main distribution system oil source pipeline and the second oil inlet. The pressure chamber is communicated with the first working port. The first oil return port, the second oil return port, the outlet of the safety valve, and the outlet of the oil collecting cover are all communicated with the oil collecting tank;

[0010] Among them, when the combined valve operates without load, the first oil inlet is communicated with the first oil return port, and the first working port is communicated with the second oil return port;

[0011] When the combined valve operates under load, the first oil inlet is not communicated with the first oil return port, and the first working port is communicated with the second oil inlet.

[0012] Further, the combined valve includes a pressure sensor, and the detection end of the pressure sensor is communicated with the inlet of the check valve.

[0013] Further, a first filter and a second filter are respectively arranged at the input end and the output end of the oil pump.

[0014] Further, the governor hydraulic system includes a first ball valve. The input end of the first ball valve is communicated with the outlet of the check valve and the second oil inlet, and the output end of the first ball valve is communicated with the oil source pipeline of the main distributor system.

[0015] Further, the governor hydraulic system includes a pressure oil tank, and an automatic air replenishing valve is arranged at the upper end of the pressure oil tank;

[0016] The governor hydraulic system further includes a second ball valve, an isolation valve, a main distributor valve, a first emergency distributor valve, a sectional closing valve, a first servomotor, a control ring, a second servomotor, and a second emergency distributor valve. The main distributor valve is provided with a third oil inlet, a third oil return port, a fourth oil return port, a second working port, and a third working port. The piston rods of the first servomotor and the second servomotor are respectively connected to both sides of the control ring. One end of the oil source pipeline of the main distributor system is provided with the second ball valve and the isolation valve. The input end and the output end of the second ball valve are respectively communicated with the lower part of the pressure oil tank and the isolation valve. The other end of the oil source pipeline of the main distributor system is communicated with the third oil inlet. The second working port is communicated with the first oil port of the first emergency distributor valve. The second oil port of the first emergency distributor valve is communicated with the opening cavities of the first servomotor and the second servomotor after passing through the sectional closing valve. The third working port is communicated with the first oil port of the second emergency distributor valve. The second oil port of the second emergency distributor valve is communicated with the closing cavities of the first servomotor and the second servomotor;

[0017] Both the third oil return port and the fourth oil return port are communicated with the oil sump;

[0018] Wherein, when the control ring is opened, the third oil inlet is communicated with the second working port, and the third working port is communicated with the third oil return port; when the control ring is closed, the third oil inlet is communicated with the third working port, and the second working port is communicated with the fourth oil return port; when the control ring is not adjusted, the main distributor valve is in a fully closed state.

[0019] Further, the governor hydraulic system further includes a third ball valve, an emergency distributor oil source pipeline, and an emergency oil return pipe. The input end and the output end of the third ball valve are respectively communicated with the lower part of the pressure oil tank and one end of the emergency distributor oil source pipeline. The other end of the emergency distributor oil source pipeline is communicated with the third oil port of the second emergency distributor valve. Both ends of the emergency oil return pipe are respectively communicated with the third oil port of the first emergency distributor valve and the oil sump.

[0020] Further, the governor hydraulic system includes at least two oil pumps. A fourth ball valve is arranged on the oil source pipeline of the main distributor system. All the oil pumps are sequentially communicated with the input end of the fourth ball valve after passing through a combined valve and the first ball valve. One end of the isolation valve away from the second ball valve is communicated with the input end of the fourth ball valve.

[0021] Further, the governor hydraulic system includes a pressure gas tank, and the upper end of the pressure oil tank is communicated with the upper end of the pressure gas tank.

[0022] Further, the input end of the automatic air replenishing valve is communicated with the medium-pressure air system.

[0023] In a second aspect, a method for detecting internal leakage of a combined valve of a governor hydraulic system is provided, which includes the following steps:

[0024] Drain the oil in the oil collecting tank so that the connection of the first oil return port to the oil collecting tank, the connection of the second oil return port to the oil collecting tank, the outlet of the safety valve to the oil collecting tank, and the outlet of the oil collecting cover to the oil collecting tank are exposed;

[0025] Operate the oil pump so that the combined valve runs no-load and then under load in sequence, and at the same time catch the oil at the connection of the first oil return port to the oil collecting tank, the connection of the second oil return port to the oil collecting tank, the outlet of the safety valve to the oil collecting tank, and the outlet of the oil collecting cover to the oil collecting tank respectively, so as to determine the internal leakage conditions of the loading and unloading valve, the loading and unloading solenoid valve, the safety valve, and the safety valve body respectively.

[0026] The beneficial effects of the present invention are as follows:

[0027] By entering the oil collecting tank, the oil leakage conditions at the connection of the first oil return port to the oil collecting tank, the connection of the second oil return port to the oil collecting tank, the outlet of the safety valve to the oil collecting tank, and the outlet of the oil collecting cover to the oil collecting tank can be observed, and the oil leakage amount can be measured correspondingly, so as to determine the internal leakage conditions of the loading and unloading valve, the loading and unloading solenoid valve, the safety valve, and the safety valve body, and thus facilitate the detection of internal leakage of the combined valve. Description of the Drawings

[0028] In the following, the present invention will be described in more detail based on embodiments and with reference to the drawings. Among them:

[0029] Figure 1 shows a schematic structural diagram of the present invention;

[0030] Figure 2 shows a schematic structural diagram of the combined valve in the present invention;

[0031] In the drawings, the same components are denoted by the same reference numerals. The drawings are not drawn to actual scale.

[0032] Reference Numerals:

[0033] 1. Oil pump; 2. First filter; 3. Second filter; 4. Combination valve; 401. Loading and unloading valve; 402. Loading and unloading solenoid valve; 403. Safety valve; 404. Pressure sensor; 405. Check valve; 5. First ball valve; 6. Oil sump; 7. Fourth ball valve; 8. Emergency return oil pipe; 9. Main distributor valve; 10. Second emergency distributor valve; 11. First emergency distributor valve; 12. Sectional closing valve; 13. First servomotor; 14. Second servomotor; 15. Control ring; 16. Emergency distributor oil source pipeline; 17. Main distributor system oil source pipeline; 18. Isolation valve; 19. Third ball valve; 20. Second ball valve; 21. Pressure oil tank; 22. Pressure gas tank; 23. Automatic air make-up valve. Detailed implementation mode

[0034] The present invention will be further described below in conjunction with the accompanying drawings.

[0035] The present invention provides a governor hydraulic system, as Figure 1 and Figure 2 shown, which includes an oil sump 6, an oil pump 1, a combination valve 4 and a main distributor system oil source pipeline 17. The input end of the oil pump 1 is connected to the bottom of the oil sump 6. The combination valve 4 includes a loading and unloading valve 401, a loading and unloading solenoid valve 402, a safety valve 403 and a check valve 405;

[0036] The loading and unloading valve 401 is provided with a first oil inlet, a first oil return port and a pressure chamber;

[0037] The loading and unloading solenoid valve 402 is provided with a second oil inlet, a second oil return port and a first working port;

[0038] The outer cover of the safety valve 403 is provided with an oil collecting cover;

[0039] The output end of the oil pump 1 is connected to the first oil inlet, the inlet of the safety valve 403 and the inlet of the check valve 405. The outlet of the check valve 405 is connected to the main distributor system oil source pipeline 17 and the second oil inlet. The pressure chamber is connected to the first working port. The first oil return port, the second oil return port, the outlet of the safety valve 403 and the outlet of the oil collecting cover are all connected to the oil sump 6;

[0040] Among them, when the combination valve 4 operates without load, the first oil inlet is connected to the first oil return port, and the first working port is connected to the second oil return port;

[0041] When the combination valve 4 operates under load, the first oil inlet is not connected to the first oil return port, and the first working port is connected to the second oil inlet;

[0042] In addition, the combination valve 4 includes a pressure sensor 404, and the detection end of the pressure sensor 404 is connected to the inlet of the check valve 405.

[0043] It should be noted that under normal conditions, when starting without load, the first oil inlet and the first oil return port of the loading and unloading valve 401 are connected, and the first working port and the second oil return port of the loading and unloading solenoid valve 402 are connected. The pressure oil in the pressure chamber on the loading and unloading valve 401 is discharged into the oil sump 6 after passing through the loading and unloading solenoid valve 402; when loading is required, the loading and unloading solenoid valve 402 is actuated, and the second oil inlet and the first working port are connected, and the control oil source enters the pressure chamber of the loading and unloading valve 401 to block the unloading oil circuit of the loading and unloading valve 401 through the piston inside the loading and unloading valve 401.

[0044] In addition, the oil pumped by the oil pump 1 is loaded through the loading and unloading valve 401 inside the combined valve 4 and then enters the main distribution system oil source pipeline 17 through the check valve 405 and the first ball valve 5; when the safety valve 403 detects that the pressure exceeds the set value, it acts and directly unloads the oil to the oil sump 6 to ensure stability.

[0045] It should also be noted that the combined valve 4 mainly has four working states.

[0046] The first working state is the start-up of the oil pump 1 with switching. Specifically, according to the system pressure, it is determined whether the combined valve 4 is in the loading state or the unloading state; when the system pressure ≤ 6.1 MPa, after the oil pump 1 starts, the combined valve 4 enters the loading state after a 5-second delay to provide pressure oil for the main distribution system oil source pipeline 17, so that the motor starts under low load conditions to reduce the starting current.

[0047] The second working state is the unloading state. Specifically, when the system pressure reaches the rated pressure of 6.3 MPa, the oil sent by the oil pump 1 passes through the cooler and enters the oil sump 6 to cool the oil in the oil sump 6; and the unloading pressure is 0.4 - 0.8 MPa.

[0048] The third working state is the loading state. Specifically, when the system pressure drops to 6.1 MPa, the loading and unloading solenoid valve 402 acts, and the combined valve 4 switches to the loading state, and the oil pump 1 starts to deliver pressure oil to the main distribution system oil source pipeline 17; when the system pressure reaches 6.3 MPa, the combined valve 4 enters the unloading state to keep the system pressure maintained at 6.1 - 6.3 MPa.

[0049] The fourth working state is the safety protection state. Specifically, the safety valve 403 is the last-level protection barrier of the combined valve 4. When the loading and unloading solenoid valve 402 or the loading and unloading valve 401 fails, it will cause the pressure of the main distribution system oil source pipeline 17 to continuously rise and cannot be unloaded; therefore, the safety valve 403 is set to act when the pressure of the main distribution system oil source pipeline 17 reaches 6.4 - 6.5 MPa, so that the pressure oil sent by the oil pump 1 is discharged back to the oil sump 6 through the safety valve 403, thus ensuring the safety of the entire governor hydraulic system.

[0050] In one embodiment, a first filter 2 and a second filter 3 are respectively arranged at the input end and the output end of the oil pump 1.

[0051] In one embodiment, the governor hydraulic system includes a first ball valve 5. The input end of the first ball valve 5 is communicated with the outlet of the check valve 405 and the second oil inlet. The output end of the first ball valve 5 is communicated with the oil source pipeline 17 of the main distributor system.

[0052] Furthermore, the governor hydraulic system includes a pressure oil tank 21, and an automatic air replenishing valve 23 is arranged at the upper end of the pressure oil tank 21;

[0053] The governor hydraulic system further includes a second ball valve 20, an isolation valve 18, a main distributor valve 9, a first emergency distributor valve 11, a sectional closing valve 12, a first servomotor 13, a control ring 15, a second servomotor 14, and a second emergency distributor valve 10. The main distributor valve 9 is provided with a third oil inlet, a third oil return port, a fourth oil return port, a second working port, and a third working port. The piston rods of the first servomotor 13 and the second servomotor 14 are respectively connected to both sides of the control ring 15. One end of the oil source pipeline 17 of the main distributor system is provided with the second ball valve 20 and the isolation valve 18. The input end and the output end of the second ball valve 20 are respectively communicated with the lower part of the pressure oil tank 21 and the isolation valve 18. The other end of the oil source pipeline 17 of the main distributor system is communicated with the third oil inlet. The second working port is communicated with the first oil port of the first emergency distributor valve 11. The second oil port of the first emergency distributor valve 11 is communicated with the open chambers of the first servomotor 13 and the second servomotor 14 after passing through the sectional closing valve 12. The third working port is communicated with the first oil port of the second emergency distributor valve 10. The second oil port of the second emergency distributor valve 10 is communicated with the closing chambers of the first servomotor 13 and the second servomotor 14;

[0054] Both the third oil return port and the fourth oil return port are communicated with the oil collecting tank 6;

[0055] Wherein, when the control ring 15 is opened, the third oil inlet is communicated with the second working port, and the third working port is communicated with the third oil return port; when the control ring 15 is closed, the third oil inlet is communicated with the third working port, and the second working port is communicated with the fourth oil return port; when the control ring 15 is not adjusted, the main distributor valve 9 is in a fully closed state.

[0056] Furthermore, the governor hydraulic system further includes a third ball valve 19, an emergency distributor oil source pipeline 16, and an emergency oil return pipe 8. The input end and the output end of the third ball valve 19 are respectively communicated with the lower part of the pressure oil tank 21 and one end of the emergency distributor oil source pipeline 16. The other end of the emergency distributor oil source pipeline 16 is communicated with the third oil port of the second emergency distributor valve 10. Both ends of the emergency oil return pipe 8 are respectively communicated with the third oil port of the first emergency distributor valve 11 and the oil collecting tank 6.

[0057] Further, the governor hydraulic system includes four oil pumps 1. A fourth ball valve 7 is provided on the oil source pipeline 17 of the main distributor system. All the oil pumps 1 are sequentially connected to the input end of the fourth ball valve 7 after passing through a combined valve 4 and a first ball valve 5. One end of the isolation valve 18 away from the second ball valve 20 is connected to the input end of the fourth ball valve 7.

[0058] It should be noted that the combined valve 4 provided at each oil pump 1 and the corresponding connection relationships are the same.

[0059] It should be emphasized that the governor hydraulic system has three states: normal start / stop and emergency stop.

[0060] Specifically, when the normal opening control loop 15 is activated, the main oil path of the oil fluid passes through the pressure oil tank 21, the second ball valve 20, the isolation valve 18, the main distributor system oil source pipeline 17, the fourth ball valve 7, the main distributor valve 9, the first emergency distributor valve 11, the sectional closing valve 12, the open chambers of the first servomotor 13 and the second servomotor 14, so that the first servomotor 13 and the second servomotor 14 simultaneously drive the control loop 15 to rotate in the opening direction; the oil return from the closing chambers of the first servomotor 13 and the second servomotor 14 passes through the second emergency distributor valve 10 and the main distributor valve 9 and returns to the oil sump 6.

[0061] When the normal closing control loop 15 is activated, the main oil path of the oil fluid passes through the pressure oil tank 21, the second ball valve 20, the isolation valve 18, the main distributor system oil source pipeline 17, the fourth ball valve 7, the main distributor valve 9, the second emergency distributor valve 10, the closing chambers of the first servomotor 13 and the second servomotor 14, so that the first servomotor 13 and the second servomotor 14 simultaneously drive the control loop 15 to rotate in the closing direction; the oil return from the opening chambers of the first servomotor 13 and the second servomotor 14 passes through the sectional closing valve 12, the first emergency distributor valve 11 and the main distributor valve 9 and returns to the oil sump 6.

[0062] During emergency stop, the main oil path of the oil fluid passes through the pressure oil tank 21, the third ball valve 19, the emergency distributor oil source pipeline 16, the second emergency distributor valve 10, the closing chambers of the first servomotor 13 and the second servomotor 14, so that the first servomotor 13 and the second servomotor 14 simultaneously drive the control loop 15 to rotate quickly in the closing direction; the oil return from the opening chambers of the first servomotor 13 and the second servomotor 14 passes through the sectional closing valve 12, the first emergency distributor valve 11 and the emergency oil return pipe 8 and directly returns to the oil sump 6, without passing through the main distributor valve 9.

[0063] In one embodiment, the governor hydraulic system includes a pressure gas tank 22. The upper end of the pressure oil tank 21 is connected to the upper end of the pressure gas tank 22; the input end of the automatic air replenishing valve 23 is connected to the medium-pressure gas system.

[0064] It should be noted that before the governor hydraulic system is used, it needs to be boosted to 6.3 MPa. The boosting air source of the automatic air replenishing valve 23 is connected to the pressure system in the power station, and the medium-pressure air compressor in the power station is used for air supply. It is connected to the pressure gas tank 22 and the pressure oil tank 21 through the automatic air replenishing valve 23.

[0065] It should be emphasized that under normal circumstances, the oil sump 6 is under no pressure. When the pressure in the oil source pipeline 17 of the main distribution system and the pressure oil tank 21 reaches the set value, four oil pumps 1 are started and rotated for operation. When the oil pump 1 is started, turbine oil is pumped from the oil sump 6. The oil passes through the first filter 2, the second filter 3 and the combined valve 4 and then is pumped into the oil source pipeline 17 of the main distribution system to ensure that the oil level and oil pressure in the main distribution system operate within the set range.

[0066] The present invention also provides a method for detecting internal leakage of the combined valve in the governor hydraulic system, which includes the following steps:

[0067] Fully open the second ball valve 20;

[0068] Fully open the third ball valve 19;

[0069] Fully open the fourth ball valve 7;

[0070] Fully open the isolation valve 18;

[0071] Drain the oil in the oil sump 6 to the lowest oil level so that the connection points of the first oil return port, the second oil return port, the outlet of the safety valve 403 and the outlet of the oil collecting cover in the oil sump 6 are exposed;

[0072] Start the four oil pumps 1 one by one to make the combined valve 4 run without load and with load in sequence. At the same time, catch the oil at the connection points of the first oil return port, the second oil return port, the outlet of the safety valve 403 and the outlet of the oil collecting cover in the oil sump 6 respectively, so as to determine whether the load / unload valve 401, the load / unload solenoid valve 402, the safety valve 403 and the safety valve 403 body are leaking and measure the leakage amount, thus facilitating the judgment of the severity of the internal leakage and further facilitating the adoption of different treatment plans.

[0073] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0074] While the invention has been described herein with reference to particular embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. It should thus be understood that numerous modifications may be made to the exemplary embodiments, and other arrangements may be devised, without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that the different dependent claims and the features described herein may be combined in ways different from those described in the original claims. It should also be understood that the features described in connection with separate embodiments may be used in other described embodiments.

Claims

1. A governor hydraulic system, characterized in that, It includes an oil collecting tank (6), an oil pump (1), a combined valve (4) and a main distribution system oil source pipeline (17). The input end of the oil pump (1) is connected to the bottom of the oil collecting tank (6). The combined valve (4) includes a loading and unloading valve (401), a loading and unloading solenoid valve (402), a safety valve (403) and a check valve (405). The loading and unloading valve (401) is provided with a first oil inlet, a first oil return port and a pressure chamber. The loading and unloading solenoid valve (402) is provided with a second oil inlet, a second oil return port and a first working port. A oil collecting cover is provided outside the safety valve (403). The output end of the oil pump (1) is connected to the first oil inlet, the inlet of the safety valve (403) and the inlet of the check valve (405). The outlet of the check valve (405) is connected to the main distribution system oil source pipeline (17) and the second oil inlet. The pressure chamber is connected to the first working port. The first oil return port, the second oil return port, the outlet of the safety valve (403) and the outlet of the oil collecting cover are all connected to the oil collecting tank (6). Among them, when the combined valve (4) operates without load, the first oil inlet is connected to the first oil return port, and the first working port is connected to the second oil return port. When the combined valve (4) operates under load, the first oil inlet is not connected to the first oil return port, and the first working port is connected to the second oil inlet.

2. The governor hydraulic system according to claim 1, wherein The combined valve (4) includes a pressure sensor (404), and the detection end of the pressure sensor (404) is connected to the inlet of the check valve (405).

3. The governor hydraulic system according to claim 1 or 2, characterized in that, A first filter (2) and a second filter (3) are respectively arranged at the input end and the output end of the oil pump (1).

4. The governor hydraulic system according to claim 1 or 2, characterized in that It includes a first ball valve (5). The input end of the first ball valve (5) is connected to the outlet of the check valve (405) and the second oil inlet, and the output end of the first ball valve (5) is connected to the main distribution system oil source pipeline (17).

5. The governor hydraulic system according to claim 4, characterized in that, It includes a pressure oil tank (21), and an automatic air replenishing valve (23) is arranged at the upper end of the pressure oil tank (21). It also includes a second ball valve (20), an isolation valve (18), a main distributor valve (9), a first emergency distributor valve (11), a sectional closing valve (12), a first servomotor (13), a control ring (15), a second servomotor (14), and a second emergency distributor valve (10). The main distributor valve (9) is provided with a third oil inlet, a third oil return port, a fourth oil return port, a second working port, and a third working port. The piston rods of the first servomotor (13) and the second servomotor (14) are respectively connected to both sides of the control ring (15). One end of the main distributor system oil source pipeline (17) is provided with the second ball valve (20) and the isolation valve (18). The input end and the output end of the second ball valve (20) are respectively communicated with the lower part of the pressure oil tank (21) and the isolation valve (18). The other end of the main distributor system oil source pipeline (17) is communicated with the third oil inlet. The second working port is communicated with the first oil port of the first emergency distributor valve (11). The second oil port of the first emergency distributor valve (11) is communicated with the open cavities of the first servomotor (13) and the second servomotor (14) after passing through the sectional closing valve (12). The third working port is communicated with the first oil port of the second emergency distributor valve (10). The second oil port of the second emergency distributor valve (10) is communicated with the closing cavities of the first servomotor (13) and the second servomotor (14); Both the third oil return port and the fourth oil return port are communicated with the oil sump (6); Wherein, when the control ring (15) is opened, the third oil inlet is communicated with the second working port, and the third working port is communicated with the third oil return port; when the control ring (15) is closed, the third oil inlet is communicated with the third working port, and the second working port is communicated with the fourth oil return port; when the control ring (15) is not adjusted, the main distributor valve (9) is in a fully closed state.

6. The governor hydraulic system according to claim 5, wherein, It also includes a third ball valve (19), an emergency distributor oil source pipeline (16), and an emergency oil return pipe (8). The input end and the output end of the third ball valve (19) are respectively communicated with the lower part of the pressure oil tank (21) and one end of the emergency distributor oil source pipeline (16). The other end of the emergency distributor oil source pipeline (16) is communicated with the third oil port of the second emergency distributor valve (10). Both ends of the emergency oil return pipe (8) are respectively communicated with the third oil port of the first emergency distributor valve (11) and the oil sump (6).

7. The governor hydraulic system according to claim 5, characterized in that, It includes at least two oil pumps (1). A fourth ball valve (7) is arranged on the main distributor system oil source pipeline (17). All the oil pumps (1) are sequentially communicated with the input end of the fourth ball valve (7) after passing through the combined valve (4) and the first ball valve (5). One end of the isolation valve (18) away from the second ball valve (20) is communicated with the input end of the fourth ball valve (7).

8. The governor hydraulic system according to claim 5, characterized in that, It includes a pressure gas tank (22). The upper end of the pressure oil tank (21) is communicated with the upper end of the pressure gas tank (22).

9. The governor hydraulic system according to claim 5, wherein, The input end of the automatic air replenishing valve (23) is communicated with the medium-pressure gas system.

10. A method for detecting internal leakage of a combined valve in a governor hydraulic system according to any one of claims 1-9, characterized in that, It includes the following steps: Drain the oil in the oil collecting tank (6) so that the first oil return port at the connection with the oil collecting tank (6), the second oil return port at the connection with the oil collecting tank (6), the outlet of the safety valve (403) at the connection with the oil collecting tank (6), and the outlet of the oil collecting cover at the connection with the oil collecting tank (6) are exposed; Operate the oil pump (1) so that the combined valve (4) operates no-load and then under load in sequence, and at the same time catch the oil at the connection of the first oil return port with the oil collecting tank (6), the connection of the second oil return port with the oil collecting tank (6), the outlet of the safety valve (403) at the connection with the oil collecting tank (6), and the outlet of the oil collecting cover at the connection with the oil collecting tank (6), respectively, in order to determine the internal leakage of the load / unload valve (401), the load / unload solenoid valve (402), the safety valve (403), and the safety valve (403) body, respectively.

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