Internal leakage diagnosis system and method based on hydraulic system accident pressure distributing device

Abstract

The invention belongs to the technical field of hydraulic systems, and particularly relates to an inner leakage diagnosis system and method based on a hydraulic system accident pressure distributing device. Based on a hydraulic system accident pressure distributing device inner leakage diagnosis system, a pressure oil tank is connected with a main pressure distributing system oil source pipeline, the main pressure distributing system oil source pipeline is sequentially connected with a main oil supply source valve, an isolation valve, a speed regulating system main distribution service valve and a main pressure distributing valve, and the main pressure distributing valve is connected with a first accident pressure distributing valve and a second accident pressure distributing valve through pipelines. The first emergency distributing valve is connected with a segmented closing valve through a pipeline; the device further comprises a first servomotor, a second servomotor and a control ring. The accident pressure distribution oil source pipeline is connected with a speed regulator accident oil source valve; the speed regulator control pipeline is connected with a speed regulator control oil source valve; the mechanical over-speed oil return pipe is connected with a sectional closing lock ingot over-speed oil return valve; and the mechanical over-speed oil supply pipe is connected with a sectional closing lock ingot over-speed control oil source valve. The invention provides a rapid inner leakage diagnosis system and method based on a hydraulic system accident pressure distribution device.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydraulic systems, and particularly relates to a leakage diagnosis system and method for an accident pressure distribution device in a hydraulic system. Background Art

[0002] The mechanical part of the power station hydraulic system mainly includes: energy storage devices: pressure oil tanks, pressure gas tanks; energy supply parts: pressure oil pump motor units, hydraulic auxiliary components such as combined valves; hydraulic control parts: main pressure distribution valves, stepper motor type conversion devices, servo proportional valves, accident pressure distribution valves and other control components; execution parts: two servomotors. When there is internal leakage in the accident pressure distribution valve on the main oil supply line and the oil source pipeline of the main pressure distribution system, it affects the sealing performance of the governor system equipment and the stability of the governing system. Therefore, it is necessary to timely diagnose the internal leakage of the accident pressure distribution valve to determine whether there is internal leakage. At present, there is no method for quickly diagnosing the internal leakage of the accident pressure distribution valve in the prior art. Summary of the Invention

[0003] In order to solve the above problems existing in the prior art, the purpose of the present invention is to provide a system and method for quickly diagnosing internal leakage based on an accident pressure distribution device in a hydraulic system.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A leakage diagnosis system for an accident pressure distribution device in a hydraulic system includes a pressure oil tank and a pressure gas tank connected by a pipeline. The pressure oil tank is connected to the oil source pipeline of the main pressure distribution system. The main oil source pipeline of the main pressure distribution system is sequentially connected with a main oil supply source valve, an isolation valve, a governor system main pressure distribution maintenance valve and a main pressure distribution valve. The main pressure distribution valve is respectively connected to a first accident pressure distribution valve and a second accident pressure distribution valve through pipelines. The first accident pressure distribution valve is connected to a sectional closing valve through a pipeline; it also includes a first servomotor, a second servomotor and a control ring. The sectional closing valve is respectively connected to the opening cavities of the first servomotor and the second servomotor through pipelines. The control ring is respectively connected to the output ends of the first servomotor and the second servomotor. The second accident pressure distribution valve is respectively connected to the closing cavities of the first servomotor and the second servomotor through pipelines;

[0006] An accident pressure distribution oil source pipeline is also connected between the pressure oil tank and the second accident pressure distribution valve. The accident pressure distribution oil source pipeline is connected with a governor accident oil source valve;

[0007] A governor control pipeline is connected to the main oil source pipeline of the main pressure distribution system. The governor control pipeline is connected to the pipeline between the isolation valve and the governor system main pressure distribution maintenance valve. The other end of the governor control pipeline is connected to the bottom of the main pressure distribution valve. A governor control oil source valve is connected to the governor control pipeline;

[0008] It also includes an oil collecting tank and an overspeed protection switching valve connected to the large shaft. A mechanical overspeed oil return pipe is connected between the overspeed protection switching valve and the oil collecting tank, and a sectional closing lock spindle overspeed oil return valve is connected to the mechanical overspeed oil return pipe.

[0009] A mechanical overspeed oil supply pipe is connected between the accident pressure oil source pipeline and the overspeed protection switching valve, and a sectional closing lock spindle overspeed control oil source valve is connected to the mechanical overspeed oil supply pipe.

[0010] In the diagnostic system of the present invention, a main oil supply source valve, a main distribution overhaul valve of the speed regulation system, an accident oil source valve of the governor, a control oil source valve of the governor, a sectional closing lock spindle overspeed oil return valve, and a sectional closing lock spindle overspeed control oil source valve are respectively provided. By controlling the valves, it is possible to sequentially judge whether there is oil leakage at each part of the first accident pressure valve and the second accident pressure valve. The present invention realizes the complete processes of normal shutdown and accident shutdown of the governor hydraulic system, and at the same time provides a method for checking internal oil leakage to quickly judge the degree of oil leakage inside the accident pressure valve.

[0011] As a preferred solution of the present invention, both the first accident pressure valve and the second accident pressure valve are accident pressure valves. The accident pressure valve includes a housing, an end cover is connected to the open end inside the housing, two valve cores are arranged inside the housing, a valve seat matched with the valve core is installed inside the housing, a spring is connected between the valve core and the end cover, and an indicating rod is connected to one of the valve cores, and the other end of the indicating rod extends out of the end cover; a sealing ring is arranged between the valve core and the inner wall of the housing, the cavity at the end of the valve core far from the valve seat is connected with a valve closing interface, and an open valve step is arranged in the middle section of the valve core, and an open valve interface is connected at the open valve step.

[0012] As a preferred solution of the present invention, an accident shutdown hydraulic control valve is connected between the first accident pressure valve and the second accident pressure valve, and an accident shutdown solenoid valve is connected to the accident shutdown hydraulic control valve.

[0013] As a preferred solution of the present invention, a control oil source pipeline is connected between the accident pressure oil source pipeline and the accident shutdown hydraulic control valve.

[0014] As a preferred solution of the present invention, the oil collecting tank is respectively connected to the accident shutdown hydraulic control valve and the accident shutdown solenoid valve through pipelines.

[0015] As a preferred solution of the present invention, a mechanical overspeed protection pressure holding oil pipe is connected between the accident shutdown solenoid valve and the overspeed protection switching valve.

[0016] As a preferred solution of the present invention, a plurality of oil supply pipelines are connected to the main distribution system oil source pipeline, oil pumps are connected to the oil supply pipelines, and the other ends of the oil supply pipelines are connected to the oil collecting tank.

[0017] As a preferred solution of the present invention, an accident oil return pipe is connected between the first accident valve and the oil collecting tank.

[0018] As a preferred embodiment of the present invention, an air supply pipeline is connected to the pressure oil tank, an automatic air supply valve is connected to the air supply pipeline, and the other end of the air supply pipeline is connected to the medium-pressure air system.

[0019] A method for diagnosing internal leakage of an accident pressure distribution device based on a hydraulic system includes the following steps:

[0020] S1: Completely close the main distribution maintenance valve of the unit governor system; completely close the accident oil source valve of the unit governor; completely open the isolation valve of the unit governor system; operate the main spool of the main pressure distribution valve of the unit to the fully open maximum position and maintain it, and the main piston of the main pressure distribution valve reaches the lowest position; observe whether the return oil pipe of the closing cavity of the main pressure distribution valve leaks oil in the oil sump and measure the oil leakage of this return oil pipe; if there is oil leakage, it means that there is oil leakage between the main oil supply cavity and the control oil source cavity of the second accident pressure distribution valve, otherwise there is no leakage;

[0021] S2: Completely open the accident oil source valve of the unit governor; operate the main spool of the main pressure distribution valve of the unit to the fully open maximum position and maintain it, and the main piston of the main pressure distribution valve reaches the lowest position; measure the oil leakage of the return oil pipe of the closing cavity of the main pressure distribution valve in the oil sump and compare it with the measured oil leakage; if the oil leakage increases, it means that the closing cavity spool of the second accident pressure distribution valve relay leaks oil, otherwise there is no leakage;

[0022] S3: The main pressure distribution valve returns to the middle position; completely close the control oil source valve of the unit governor; the main pressure distribution valve is out of pressure and closes partially; observe whether the return oil pipe of the opening cavity of the main pressure distribution valve leaks oil in the oil sump and measure the oil leakage; if there is oil leakage, it means that there is oil leakage between the main oil cavity of the first accident pressure distribution valve and the control oil pipeline of the first accident pressure distribution valve, otherwise there is no leakage;

[0023] S4: Completely open the control oil source valve of the unit governor; completely open the main distribution maintenance valve of the unit governor system; operate the main pressure distribution valve of the unit to fully close the guide vanes and then keep the main spool of the main pressure distribution valve fully closed; completely close the sectional closing lock over-speed return oil valve of the unit; observe whether the control oil source return oil pipe of the accident pressure distribution valve leaks oil in the oil sump. If there is oil leakage, it means that there is oil leakage between the main oil cavity and the control oil source cavity of the second accident pressure distribution valve, otherwise there is no leakage;

[0024] S5: Completely open the sectional closing lock over-speed return oil valve of the unit; operate the main pressure distribution valve of the unit to fully open the guide vanes and then keep the main spool of the main pressure distribution valve fully open; observe whether the accident return oil pipe leaks oil in the oil sump and measure the oil leakage of this return oil pipe; if there is oil leakage, it means that the accident return oil main spool of the first accident pressure distribution valve leaks oil, otherwise there is no leakage;

[0025] S6: Completely close the sectional closing lock over-speed return oil valve of the unit; observe whether the control oil source return oil pipe of the accident pressure distribution valve leaks oil in the oil sump; if there is oil leakage, it means that there is oil leakage between the main oil cavity and the accident pressure distribution valve control oil cavity of the first accident pressure distribution valve, otherwise there is no leakage;

[0026] S7: Close the sectional shutdown lock and overspeed return oil valve of the entire unit; operate the emergency shutdown solenoid valve of the unit, the emergency distributor valve is put into operation, and the guide vanes are fully closed; fully close the main distribution overhaul valve of the unit's speed governing system; operate the main spool of the unit's main distributor valve to keep it fully open; observe whether there is oil leakage in the return oil pipe of the main distributor valve closing cavity in the oil sump; if there is oil leakage, the main spool of the main distributor valve closing cavity of the second emergency distributor valve leaks oil, otherwise it does not leak;

[0027] S8: The main distributor valve returns to the middle position; fully close the sectional shutdown lock and overspeed return oil valve of the unit; observe whether there is oil leakage in the return oil pipe of the control oil source of the emergency distributor valve in the oil sump; if there is oil leakage, there is oil leakage between the main oil cavity of the second emergency distributor valve and the control oil cavity of the emergency distributor valve, otherwise it does not leak;

[0028] S9: Fully close the emergency oil source valve of the unit's speed governor; observe whether there is oil leakage in the emergency return oil pipe in the oil sump and measure the oil leakage of this return oil pipe; if there is oil leakage, there is oil leakage between the main oil cavity and the control oil source cavity of the first emergency distributor valve, otherwise it does not leak;

[0029] S10: Fully open the emergency oil source valve of the unit's speed governor; fully close the sectional shutdown lock and overspeed control oil source valve of the unit; observe whether there is oil leakage in the emergency return oil pipe in the oil sump and measure the oil leakage of this return oil pipe, and compare it with the measured oil leakage; if the oil leakage increases, there is internal leakage in the relay piston, otherwise it does not leak;

[0030] S11: Fully open the main distribution overhaul valve of the unit's speed governing system; fully open the sectional shutdown lock and overspeed control oil source valve of the unit; operate the main spool of the unit's main distributor valve to keep it fully open; observe whether there is oil leakage in the emergency return oil pipe in the oil sump and measure the oil leakage of this return oil pipe, and compare it with the measured oil leakage. If the oil leakage increases, the main spool of the main distributor valve opening cavity of the first emergency distributor valve leaks oil, otherwise it does not leak.

[0031] The beneficial effects of the present invention are as follows:

[0032] In the diagnosis system of the present invention, there are respectively provided a main oil supply source valve, a main distribution overhaul valve of the speed governing system, an emergency oil source valve of the speed governor, a control oil source valve of the speed governor, a sectional shutdown lock and overspeed return oil valve, and a sectional shutdown lock and overspeed control oil source valve. Through the control of the valves, it can be judged in turn whether there is oil leakage at various parts of the first emergency distributor valve and the second emergency distributor valve. The present invention realizes the complete process of normal shutdown and emergency shutdown of the speed governor hydraulic system, and at the same time provides a method for checking internal leakage to quickly judge the degree of internal leakage of the emergency distributor valve. Brief Description of the Drawings

[0033] Figure 1 is the structural schematic diagram of the present invention;

[0034] Figure 2 is the partial structural diagram of the present invention;

[0035] Figure 3 is a sectional view of the first accident pressure regulating valve;

[0036] Figure 4 is a sectional view of the second accident pressure regulating valve;

[0037] Figure 5 is a schematic diagram of the principle of the accident pressure regulating valve;

[0038] Figure 6 is a schematic diagram of oil leakage between the main oil supply chamber and the control oil source chamber of the second accident pressure regulating valve;

[0039] Figure 7 is a schematic diagram of oil leakage of the spool in the closing chamber of the servomotor of the second accident pressure regulating valve;

[0040] Figure 8 is a schematic diagram of oil leakage of the first accident pressure regulating valve;

[0041] Figure 9 is a schematic diagram of oil leakage between the main oil chamber and the control oil source chamber of the second accident pressure regulating valve;

[0042] Figure 10 is a schematic diagram of oil leakage of the main spool of the accident return oil of the first accident pressure regulating valve;

[0043] Figure 11 is a schematic diagram of oil leakage between the main oil chamber and the control oil source chamber of the first accident pressure regulating valve;

[0044] Figure 12 is a schematic diagram of oil leakage of the spool in the closing chamber of the main pressure regulating valve of the second accident pressure regulating valve;

[0045] Figure 13 is a schematic diagram of oil leakage between the main oil chamber and the accident control oil source chamber of the second accident pressure regulating valve;

[0046] Figure 14 is a schematic diagram of oil leakage between the main oil chamber and the control oil source chamber of the first accident pressure regulating valve;

[0047] Figure 15 is a schematic diagram of oil leakage of the spool in the opening chamber of the main pressure regulating valve of the first accident pressure regulating valve.

[0048] In the figure: 1 - pressure oil tank; 2 - pressure gas tank; 3 - oil source pipeline of main distributor system; 4 - main oil supply source valve; 5 - isolation valve; 6 - main distributor overhaul valve of speed regulation system; 7 - main distributor valve; 8 - first emergency distributor valve; 9 - second emergency distributor valve; 10 - sectional closing valve; 11 - first servomotor; 12 - second servomotor; 13 - control ring; 14 - emergency distributor oil source pipeline; 15 - emergency oil source valve of governor; 16 - governor control pipeline; 17 - governor control oil source valve; 18 - oil sump; 19 - overspeed protection switching valve; 20 - mechanical overspeed return oil pipe; 21 - sectional closing locking overspeed return oil valve; 22 - mechanical overspeed oil supply pipe; 23 - sectional closing locking overspeed control oil source valve; 24 - emergency shutdown hydraulic control valve; 25 - emergency shutdown solenoid valve; 26 - control oil source pipeline; 27 - mechanical overspeed protection pressure holding oil pipe; 28 - oil supply pipeline; 29 - emergency return oil pipe; 30 - gas supply pipeline; 31 - automatic gas supply valve; a1 - housing; a2 - end cover; a3 - valve core; a4 - valve seat; a5 - spring; a6 - indicating rod; a7 - valve closing interface; a8 - valve opening interface. Detailed implementation manners

[0049] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. Generally, the components of the embodiments of the present invention described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0050] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0051] As Figure 1 and Figure 2As shown in the figure, the internal leakage diagnosis system of the accident pressure distribution device based on the hydraulic system in this embodiment includes a pressure oil tank 1 and a pressure gas tank 2 connected by a pipeline. The pressure oil tank 1 is connected to the main pressure distribution system oil source pipeline 3. The main pressure distribution system oil source pipeline 3 is successively connected with a main oil supply source valve 4, an isolation valve 5, a governor system main pressure distribution maintenance valve 6, and a main pressure distribution valve 7. The main pressure distribution valve 7 is respectively connected to a first accident pressure distribution valve 8 and a second accident pressure distribution valve 9 through pipelines. The first accident pressure distribution valve 8 is connected to a sectional closing valve 10 through a pipeline; it also includes a first servomotor 11, a second servomotor 12, and a control ring 13. The sectional closing valve 10 is respectively connected to the opening cavity of the first servomotor 11 and the opening cavity of the second servomotor 12 through pipelines. The control ring 13 is respectively connected to the output end of the first servomotor 11 and the output end of the second servomotor 12. The second accident pressure distribution valve 9 is respectively connected to the closing cavity of the first servomotor 11 and the closing cavity of the second servomotor 12 through pipelines; between the pressure oil tank 1 and the second accident pressure distribution valve 9, there is also connected an accident pressure distribution oil source pipeline 14, and the accident pressure distribution oil source pipeline 14 is connected to a governor accident oil source valve 15; on the main pressure distribution system oil source pipeline 3, there is connected a governor control pipeline 16. The governor control pipeline 16 is connected to the pipeline between the isolation valve 5 and the governor system main pressure distribution maintenance valve 6. The other end of the governor control pipeline 16 is connected to the bottom of the main pressure distribution valve 7. The governor control pipeline 16 is connected to a governor control oil source valve 17; it also includes an oil sump 18 and an overspeed protection switching valve 19 connected to the large shaft. Between the overspeed protection switching valve 19 and the oil sump 18, there is connected a mechanical overspeed return oil pipe 20, and a sectional closing lock bolt overspeed return oil valve 21 is connected to the mechanical overspeed return oil pipe 20; between the accident pressure distribution oil source pipeline 14 and the overspeed protection switching valve 19, there is connected a mechanical overspeed supply oil pipe 22, and a sectional closing lock bolt overspeed control oil source valve 23 is connected to the mechanical overspeed supply oil pipe 22.

[0052] Between the first accident pressure distribution valve 8 and the second accident pressure distribution valve 9, there is connected an accident shutdown hydraulic control valve 24, and the accident shutdown hydraulic control valve 24 is connected to an accident shutdown solenoid valve 25. Between the accident pressure distribution oil source pipeline 14 and the accident shutdown hydraulic control valve 24, there is connected a control oil source pipeline 26. The oil sump 18 is respectively connected to the accident shutdown hydraulic control valve 24 and the accident shutdown solenoid valve 25 through pipelines. Between the accident shutdown solenoid valve 25 and the overspeed protection switching valve 19, there is connected a mechanical overspeed protection holding pressure oil pipe 27. On the main pressure distribution system oil source pipeline 3, there are connected several oil supply pipelines 28, and oil pumps are connected to the oil supply pipelines 28. The other end of the oil supply pipeline 28 is connected to the oil sump 18. Between the first accident valve and the oil sump 18, there is connected an accident return oil pipe 29. On the pressure oil tank 1, there is connected a gas supply pipeline 30, and an automatic air filling valve 31 is connected to the gas supply pipeline 30. The other end of the gas supply pipeline 30 is connected to the medium-pressure gas system.

[0053] In the diagnostic system of the present invention, a main oil supply source valve 4, a main distribution overhaul valve 6 of the speed governor system, an accident oil source valve 15 of the speed governor, a control oil source valve 17 of the speed governor, a sectional closing lock and overspeed oil return valve 21, and a sectional closing lock and overspeed control oil source valve 23 are respectively arranged. By controlling the valves, it can be successively judged whether there is oil leakage at various parts of the first accident distribution valve 8 and the second accident distribution valve 9. The present invention realizes the complete processes of normal shutdown and accident shutdown of the hydraulic system of the speed governor, and at the same time provides a method for checking internal oil leakage to quickly judge the degree of oil leakage inside the accident distribution valve.

[0054] As Figure 3 and Figure 4 shown, both the first accident distribution valve 8 and the second accident distribution valve 9 are accident distribution valves. The accident distribution valve includes a housing a1, an end cover a2 is connected to the open end inside the housing a1, two valve cores a3 are arranged inside the housing a1, a valve seat a4 matched with the valve core a3 is installed inside the housing a1, a spring a5 is connected between the valve core a3 and the end cover a2, one of the valve cores a3 is connected with an indicating rod a6, and the other end of the indicating rod a6 extends out of the end cover a2; a sealing ring is arranged between the valve core a3 and the inner wall of the housing a1, the cavity at one end of the valve core a3 away from the valve seat a4 is connected with a valve closing interface a7, and an opening valve step is arranged in the middle section of the valve core a3, and an opening valve interface a8 is connected at the opening valve step.

[0055] Before the hydraulic system of the speed governor is used, it needs to be boosted to 6.3 MPa. The boosting air source is connected from the medium-pressure air system of the power station, and the power station medium-pressure air compressor is used for air supply. It is connected to the pressure gas tank 2 and the pressure oil tank 1 through the automatic air replenishing valve 31. The speed governor works in two states: normal start / stop and accident shutdown.

[0056] During normal operation, when the servomotor needs to open: The main oil circuit sequentially passes from the pressure oil tank 1, through the main oil supply source valve 4, the isolation valve 5, the main distribution system oil source pipeline 3, the main distribution overhaul valve 6 of the speed governor system, the main valve of the main distribution valve 7 moves downward, i.e., in the opening direction, the first accident distribution valve 8, the sectional closing valve 10, the opening cavity of the first servomotor 11, the opening cavity of the second servomotor 12; The first servomotor 11 and the second servomotor 12 simultaneously push the control ring 13 and move in the opening direction. The oil return of the closing cavities of the first servomotor 11 and the second servomotor 12 passes through the second accident distribution valve 9, the closing cavity of the main distribution valve 7, and returns to the oil sump 18 through the closing cavity return oil pipe under the main distribution valve 7.

[0057] When the servomotor needs to be closed: The main oil circuit sequentially passes from the pressure oil tank 1, through the main oil supply source valve 4, the isolation valve 5, the main distribution system oil source pipeline 3, the main overhaul valve 6 of the speed governor system, the main distribution valve 7, the main valve moves upward, i.e., in the closing direction, through the second emergency distribution valve 9, the closing chamber of the first servomotor 11, and the closing chamber of the second servomotor 12; The first servomotor 11 and the second servomotor 12 simultaneously push the control ring 13 and move in the closing direction. The oil in the opening chambers of the first servomotor 11 and the second servomotor 12 returns oil through the sectional closing valve 10, the first emergency distribution valve 8, and the opening chamber return oil pipe under the main distribution valve 7 to the oil sump 18.

[0058] When emergency shutdown is required: The main oil circuit sequentially passes from the pressure oil tank 1, through the emergency oil source valve 15 of the speed governor, the emergency distribution oil source pipeline 14, through the second emergency distribution valve 9, the closing chamber of the first servomotor 11, and the closing chamber of the second servomotor 12; The first servomotor 11 and the second servomotor 12 simultaneously push the control ring 13 and move quickly in the closing direction. The oil in the opening chambers of the first servomotor 11 and the second servomotor 12 returns oil through the sectional closing valve 10, the first emergency distribution valve 8, the emergency return oil pipe 29, and directly returns oil to the oil sump 18, and no longer passes through the main distribution valve 7; Under normal circumstances, the oil sump 18 is under no pressure. When the pressure in the main distribution system oil source pipeline 3 and the pressure oil tank 1 reaches the first set value, the oil pump is started. The oil pump is alternately operated by the system control ring. When the oil pump is started, it extracts turbine oil from the oil sump 18, passes through the oil supply pipe at the inlet of the oil pump, through the inlet filter, the outlet filter, and the combined valve, and pumps it into the main distribution system oil source pipeline 3 to ensure that the oil level and oil pressure in the main distribution system operate within the range set by the speed governor system.

[0059] The working principle of the emergency distribution device:

[0060] As Figure 5 shown, when the unit speed rises to 115% of the rated speed and the main distribution valve 7 of the speed governor fails to operate, or when the unit speed rises to the action value of the mechanical overspeed protection device, the emergency distribution valve acts to directly close the guide vanes completely, thereby realizing the emergency shutdown of the unit. The emergency distribution valve is connected with a special pressure oil pipeline directly from the pressure oil tank 1. Under normal circumstances, the main distribution valve 7 of the speed governor is connected to the servomotor operation pipeline through it and serves as the channel for the operation oil circuit of the main distribution valve 7. At this time, the emergency distribution valve does not work and does not affect the normal operation of the speed governor; When the mechanical overspeed protection device or the electromagnetic distribution valve acts, the emergency distribution valve first cuts off the oil circuit from the main distribution valve 7 of the speed governor to the servomotor, and then connects the pressure oil to the closing chamber of the servomotor, thereby realizing the emergency closing of the guide vanes of the unit.

[0061] The method for diagnosing internal leakage of the emergency distribution device based on the hydraulic system in this embodiment includes the following steps:

[0062] S1: Completely close the main distribution maintenance valve 6 of the unit governor system; completely close the accident oil source valve 15 of the unit governor; fully open the isolation valve 5 of the unit governor system (here, opening the isolation valve 5 does not start the oil pump. First, completely close the main oil supply source valve 4 of the unit governor system, and then slightly open the main oil supply source valve 4 of the unit governor system. At this time, open the isolation valve 5 to reduce the hydraulic impact. After the isolation valve 5 is fully open, slowly fully open the main oil supply source valve 4 of the unit governor system); operate the main spool of the main pressure regulating valve 7 of the unit to the fully open maximum position and keep it. The main piston of the main pressure regulating valve 7 reaches the lowest position; observe whether there is oil leakage in the return oil pipe of the closing cavity of the main pressure regulating valve 7 in the oil sump 18 and measure the oil leakage of this return oil pipe; if there is oil leakage, there is oil leakage between the main oil supply cavity and the control oil source cavity of the second accident pressure regulating valve 9, otherwise there is no leakage; as Figure 6 shown in the schematic diagram of oil leakage between the main oil supply cavity and the control oil source cavity of the second accident pressure regulating valve 9 (accident pressure regulating valve in the reset state), the oil leakage position is marked by the blue circle.

[0063] S2: Fully open the accident oil source valve 15 of the unit governor; operate the main spool of the main pressure regulating valve 7 of the unit to the fully open maximum position and keep it. The main piston of the main pressure regulating valve 7 reaches the lowest position; measure the oil leakage of the return oil pipe of the closing cavity of the main pressure regulating valve 7 in the oil sump 18 and compare it with the measured oil leakage; if the oil leakage increases, there is oil leakage in the closing cavity spool of the servomotor of the second accident pressure regulating valve 9, otherwise there is no leakage; as Figure 7 shown in the schematic diagram of oil leakage in the closing cavity spool of the servomotor of the second accident pressure regulating valve 9 (accident pressure regulating valve in the reset state), the oil leakage position is marked by the blue circle.

[0064] S3: The main pressure regulating valve 7 returns to the middle position; completely close the control oil source valve 17 of the unit governor; the main pressure regulating valve 7 loses pressure and closes slightly; observe whether there is oil leakage in the return oil pipe of the opening cavity of the main pressure regulating valve 7 in the oil sump 18 and measure the oil leakage; if there is oil leakage, there is oil leakage between the main oil cavity of the first accident pressure regulating valve 8 and the control oil pipeline of the first accident pressure regulating valve 8, otherwise there is no leakage; as Figure 8 shown in the schematic diagram of oil leakage of the first accident pressure regulating valve 8 (accident pressure regulating valve in the reset state), the oil leakage position is marked by the blue circle.

[0065] S4: Fully open the control oil source valve 17 of the unit governor; fully open the main distribution maintenance valve 6 of the unit governor system; operate the main pressure regulating valve 7 of the unit to fully close the guide vanes and then keep the main spool of the main pressure regulating valve 7 fully closed; completely close the sectional closing lock bolt overspeed return oil valve 21 of the unit; observe whether there is oil leakage in the return oil pipe of the control oil source of the accident pressure regulating valve in the oil sump 18. If there is oil leakage, there is oil leakage between the main oil cavity and the control oil source cavity of the second accident pressure regulating valve 9, otherwise there is no leakage; as Figure 9 shown in the schematic diagram of oil leakage between the main oil cavity and the control oil source cavity of the second accident pressure regulating valve 9 (accident pressure regulating valve in the reset state), the oil leakage position is marked by the blue circle.

[0066] S5: Close the sectional closing lock and overspeed oil return valve 21 of the entire unit; operate the main servo valve 7 of the unit to fully open the guide vane and then keep the main spool of the main servo valve 7 fully open; observe in the oil sump 18 whether the accident oil return pipe 29 leaks oil and measure the oil leakage of this return pipe; if oil leakage occurs, the accident oil return main spool of the first accident servo valve 8 leaks oil, otherwise it does not; as Figure 10 shown, the schematic diagram of the oil leakage of the accident oil return main spool of the first accident servo valve 8 (the accident servo valve is in the reset state), and the oil leakage position is marked by the blue circle.

[0067] S6: Fully close the sectional closing lock and overspeed oil return valve 21 of the unit; observe in the oil sump 18 whether the control oil source return pipe of the accident servo valve leaks oil; if it leaks oil, there is oil leakage between the main oil chamber of the first accident servo valve 8 and the control oil chamber of the accident servo valve, otherwise it does not; as Figure 11 shown, the schematic diagram of the oil leakage between the main oil chamber and the control oil source chamber of the first accident servo valve 8 (the accident servo valve is in the reset state), and the oil leakage position is marked by the blue circle.

[0068] S7: Open the sectional closing lock and overspeed oil return valve 21 of the entire unit; operate the accident shutdown solenoid valve 25 of the unit, the accident servo valve is put into operation, and the guide vane is fully closed; fully close the main servo maintenance valve 6 of the unit's speed governing system; operate the spool of the main servo valve 7 to keep it fully open; observe in the oil sump 18 whether the closing oil chamber return pipe of the main servo valve 7 leaks oil; if oil leakage occurs, the closing oil chamber spool of the main servo valve 7 of the second accident servo valve 9 leaks oil, otherwise it does not; as Figure 12 shown, the schematic diagram of the oil leakage of the closing oil chamber spool of the main servo valve 7 of the second accident servo valve 9 (the accident servo valve is in the put-in state), and the oil leakage position is marked by the blue circle.

[0069] S8: The main servo valve 7 returns to the middle position; fully close the sectional closing lock and overspeed oil return valve 21 of the unit; observe in the oil sump 18 whether the control oil source return pipe of the accident servo valve leaks oil; if it leaks oil, there is oil leakage between the main oil chamber of the second accident servo valve 9 and the control oil chamber of the accident servo valve, otherwise it does not; as Figure 13 shown, the schematic diagram of the oil leakage between the main oil chamber and the accident control oil source chamber of the second accident servo valve 9 (the accident servo valve is in the put-in state), and the oil leakage position is marked by the blue circle.

[0070] S9: Fully close the accident oil source valve 15 of the unit governor; observe in the oil sump 18 whether the accident oil return pipe 29 leaks oil and measure the oil leakage of this return pipe; if oil leakage occurs, there is oil leakage between the main oil chamber and the control oil source chamber of the first accident servo valve 8, otherwise it does not; as Figure 14 shown, the schematic diagram of the oil leakage between the main oil chamber and the control oil source chamber of the first accident servo valve 8 (the accident servo valve is in the put-in state), and the oil leakage position is marked by the blue circle.

[0071] S10: Fully open the accident oil source valve 15 of the entire unit governor; fully close the sectional closing lock safety speed control oil source valve 23 of the unit; observe whether the accident return oil pipe 29 leaks oil in the oil sump 18 and measure the oil leakage of this return oil pipe, and compare it with the measured oil leakage; if the oil leakage increases, there is internal leakage in the servomotor piston, otherwise there is no leakage.

[0072] S11: Fully open the main distribution valve overhaul valve 6 of the unit governor system; fully open the sectional closing lock safety speed control oil source valve 23 of the unit; operate the main spool of the main distribution valve 7 of the unit to maintain the fully open position; observe whether the accident return oil pipe 29 leaks oil in the oil sump 18 and measure the oil leakage of this return oil pipe, and compare it with the measured oil leakage. If the oil leakage increases, the main spool of the opening chamber of the main distribution valve 7 of the first accident distribution valve 8 leaks oil, otherwise there is no leakage; as Figure 15 shown, schematic diagram of the oil leakage of the main spool of the opening chamber of the main distribution valve 7 of the first accident distribution valve 8 (accident distribution valve in the input state), the oil leakage position is marked by the blue circle.

[0073] The present invention is not limited to the above optional embodiments. Any person can obtain other various forms of products under the inspiration of the present invention. However, no matter what changes are made in its shape or structure, as long as the technical solutions fall within the scope defined by the claims of the present invention, they all fall within the protection scope of the present invention.

Claims

1. A leakage diagnosis system for the accident pressure distribution device in a hydraulic system, characterized in that: It includes a pressure oil tank (1) and a pressure gas tank (2) connected by a pipeline. The pressure oil tank (1) is connected to the oil source pipeline (3) of the main distributor system. The main oil source valve (4), isolation valve (5), main distribution maintenance valve (6) for the governor system, and main distributor valve (7) are successively connected on the main oil source pipeline (3) of the main distributor system. The main distributor valve (7) is respectively connected to a first emergency distributor valve (8) and a second emergency distributor valve (9) through pipelines. The first emergency distributor valve (8) is connected to a sectional closing valve (10) through a pipeline; it also includes a first servomotor (11), a second servomotor (12), and a control ring (13). The sectional closing valve (10) is respectively connected to the opening chambers of the first servomotor (11) and the second servomotor (12) through pipelines. The control ring (13) is respectively connected to the output ends of the first servomotor (11) and the second servomotor (12). The second emergency distributor valve (9) is respectively connected to the closing chambers of the first servomotor (11) and the second servomotor (12) through pipelines; An emergency distribution oil source pipeline (14) is also connected between the pressure oil tank (1) and the second emergency distributor valve (9). The emergency distribution oil source pipeline (14) is connected to an emergency oil source valve (15) for the governor; A governor control pipeline (16) is connected to the main oil source pipeline (3) of the main distributor system. The governor control pipeline (16) is connected to the pipeline between the isolation valve (5) and the main distribution maintenance valve (6) for the governor system. The other end of the governor control pipeline (16) is connected to the bottom of the main distributor valve (7). A governor control oil source valve (17) is connected to the governor control pipeline (16); It also includes an oil sump (18) and an overspeed protection switching valve (19) connected to the large shaft. A mechanical overspeed return oil pipe (20) is connected between the overspeed protection switching valve (19) and the oil sump (18). A sectional closing lock and overspeed return oil valve (21) is connected to the mechanical overspeed return oil pipe (20); A mechanical overspeed supply oil pipe (22) is connected between the emergency distribution oil source pipeline (14) and the overspeed protection switching valve (19). A sectional closing lock and overspeed control oil source valve (23) is connected to the mechanical overspeed supply oil pipe (22).

2. The internal leakage diagnosis system of an accident pressure distribution device based on a hydraulic system according to claim 1, wherein: Both the first emergency distributor valve (8) and the second emergency distributor valve (9) are emergency distributor valves. The emergency distributor valve includes a housing (a1). An end cover (a2) is connected to the open end inside the housing (a1). Two valve cores (a3) are arranged inside the housing (a1). A valve seat (a4) cooperating with the valve core (a3) is installed inside the housing (a1). A spring (a5) is connected between the valve core (a3) and the end cover (a2). One of the valve cores (a3) is connected to an indicating rod (a6). The other end of the indicating rod (a6) extends out of the end cover (a2); A sealing ring is arranged between the valve core (a3) and the inner wall of the housing (a1). The cavity at one end of the valve core (a3) away from the valve seat (a4) is connected to a valve closing interface (a7). An opening valve step is arranged in the middle section of the valve core (a3). An opening valve interface (a8) is connected at the opening valve step.

3. The internal leakage diagnosis system for an accident pressure distribution device based on a hydraulic system according to claim 1, wherein: An emergency shutdown hydraulic control valve (24) is connected between the first emergency distribution valve (8) and the second emergency distribution valve (9), and the emergency shutdown hydraulic control valve (24) is connected with an emergency shutdown solenoid valve (25).

4. A leakage diagnosis system for an accident pressure distribution device in a hydraulic system according to claim 3, characterized in that: A control oil source pipeline (26) is connected between the emergency distribution oil source pipeline (14) and the emergency shutdown hydraulic control valve (24).

5. The internal leakage diagnosis system of an accident pressure distribution device based on a hydraulic system according to claim 3, characterized in that: The oil sump (18) is respectively connected with the emergency shutdown hydraulic control valve (24) and the emergency shutdown solenoid valve (25) through pipelines.

6. A leakage diagnosis system for an accident pressure distribution device in a hydraulic system according to claim 3, characterized in that: A mechanical overspeed protection holding pressure oil pipe (27) is connected between the emergency shutdown solenoid valve (25) and the overspeed protection switching valve (19).

7. A leakage diagnosis system for an accident pressure distribution device in a hydraulic system according to claim 1, characterized in that: A number of oil supply pipelines (28) are connected to the main distribution system oil source pipeline (3), oil pumps are connected to the oil supply pipelines (28), and the other ends of the oil supply pipelines (28) are connected to the oil sump (18).

8. A leakage diagnosis system for the accident pressure distribution device in a hydraulic system according to claim 1, characterized in that: An emergency return oil pipe (29) is connected between the first emergency valve and the oil sump (18).

9. A leakage diagnosis system for an accident pressure distribution device in a hydraulic system according to claim 1, characterized in that: A gas supply pipeline (30) is connected to the pressure oil tank (1), an automatic gas supply valve (31) is connected to the gas supply pipeline (30), and the other end of the gas supply pipeline (30) is connected to the medium-pressure gas system.

10. A method for diagnosing internal leakage of a pressure distribution device in a hydraulic system accident, using a diagnostic system for internal leakage of a pressure distribution device in a hydraulic system accident as described in claim 1, characterized in that: It includes the following steps: S1: Completely close the main distribution maintenance valve (6) of the unit governor system; completely close the emergency oil source valve (15) of the unit governor; completely open the isolation valve (5) of the unit governor system; operate the main spool of the main distribution valve (7) of the unit to the fully open maximum position and keep it, and the main piston of the main distribution valve (7) reaches the lowest position; observe whether the closing cavity return oil pipe of the main distribution valve (7) leaks oil in the oil sump (18) and measure the oil leakage of this return oil pipe; if it leaks oil, there is oil leakage between the main oil supply cavity and the control oil source cavity of the second emergency distribution valve (9), otherwise it does not leak. S2: Completely open the emergency oil source valve (15) of the unit governor; operate the main spool of the main distribution valve (7) of the unit to the fully open maximum position and keep it, and the main piston of the main distribution valve (7) reaches the lowest position; measure the oil leakage of the closing cavity return oil pipe of the main distribution valve (7) in the oil sump (18) and compare it with the measured oil leakage; if the oil leakage increases, the closing cavity spool of the second emergency distribution valve (9) leaks oil, otherwise it does not leak. S3: The main distribution valve (7) returns to the middle position; completely close the control oil source valve (17) of the unit governor; the main distribution valve (7) is out of pressure and biased to close; observe whether the opening cavity return oil pipe of the main distribution valve (7) leaks oil in the oil sump (18) and measure the oil leakage; if it leaks oil, there is oil leakage between the main oil cavity of the first emergency distribution valve (8) and the control oil pipeline of the first emergency distribution valve (8), otherwise it does not leak. S4: Completely open the control oil source valve (17) of the unit governor; completely open the main distribution maintenance valve (6) of the unit governor system; operate the main distribution valve (7) of the unit to completely close the guide vanes and then keep the main spool of the main distribution valve (7) in the fully closed position; completely close the sectional closing lock bolt overspeed return oil valve (21) of the unit; observe whether the emergency distribution valve control oil source return oil pipe leaks oil in the oil sump (18), if there is oil leakage, there is oil leakage between the main oil cavity and the control oil source cavity of the second emergency distribution valve (9), otherwise it does not leak. S5: Close the sectional closing lock and overspeed oil return valve (21) of the entire unit; operate the main servo valve (7) of the unit to fully open the guide vanes and then keep the main spool of the main servo valve (7) fully open; observe whether the accident oil return pipe (29) leaks oil in the oil sump (18) and measure the oil leakage of this oil return pipe; if there is oil leakage, the accident oil return main spool of the first accident servo valve (8) leaks oil, otherwise it does not leak. S6: Close the sectional closing lock and overspeed oil return valve (21) of the entire unit; observe whether the oil return pipe of the control oil source of the accident servo valve leaks oil in the oil sump (18); if there is oil leakage, there is oil leakage between the main oil chamber and the control oil chamber of the first accident servo valve (8), otherwise it does not leak. S7: Open the sectional closing lock and overspeed oil return valve (21) of the entire unit; operate the accident shutdown solenoid valve (25) of the unit, the accident servo valve is put into operation, and the guide vanes are fully closed; fully close the main servo maintenance valve (6) of the unit's speed governing system; operate the main spool of the main servo valve (7) to keep it fully open; observe whether the oil return pipe of the closing chamber of the main servo valve (7) leaks oil in the oil sump (18); if there is oil leakage, the closing chamber spool of the main servo valve (7) of the second accident servo valve (9) leaks oil, otherwise it does not leak. S8: The main servo valve (7) returns to the middle position; close the sectional closing lock and overspeed oil return valve (21) of the entire unit; observe whether the oil return pipe of the control oil source of the accident servo valve leaks oil in the oil sump (18); if there is oil leakage, there is oil leakage between the main oil chamber and the control oil chamber of the second accident servo valve (9), otherwise it does not leak. S9: Close the accident oil source valve (15) of the unit's speed governor; observe whether the accident oil return pipe (29) leaks oil in the oil sump (18) and measure the oil leakage of this oil return pipe; if there is oil leakage, there is oil leakage between the main oil chamber and the control oil source chamber of the first accident servo valve (8), otherwise it does not leak. S10: Open the accident oil source valve (15) of the entire unit; close the sectional closing lock and overspeed control oil source valve (23) of the unit; observe whether the accident oil return pipe (29) leaks oil in the oil sump (18) and measure the oil leakage of this oil return pipe, and compare it with the measured oil leakage; if the oil leakage increases, the relay piston has internal leakage, otherwise it does not leak. S11: Open the main servo maintenance valve (6) of the unit's speed governing system; open the sectional closing lock and overspeed control oil source valve (23) of the entire unit; operate the main spool of the main servo valve (7) to keep it fully open; observe whether the accident oil return pipe (29) leaks oil in the oil sump (18) and measure the oil leakage of this oil return pipe, and compare it with the measured oil leakage. If the oil leakage increases, the opening chamber spool of the main servo valve (7) of the first accident servo valve (8) leaks oil, otherwise it does not leak.

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