A hydraulic control system for a water inlet valve and a working seal

Abstract

An embodiment of this specification provides a hydraulic control system for an inlet valve and a working seal, including: an inlet valve control oil circuit and a working seal control water circuit that cooperates with the inlet valve control oil circuit; the inlet valve control oil circuit includes: an inlet valve fully closed feedback oil pipeline, on which a power failure detection solenoid valve and an inlet valve fully closed induction stroke valve controlled by the opening and closing positions of the inlet valve servomotor are provided; the working seal control water circuit includes: a first operation water pipeline and a second operation water pipeline respectively connected to the working seal input cavity and the withdrawal cavity, a working seal control valve connected to the first operation water pipeline and the second operation water pipeline, a first isolation valve, a water source lock valve, an inlet valve water filter, and an inlet valve seal operation water intake valve connected to the first operation water pipeline, and a second isolation valve connected to the second operation water pipeline; the hydraulic control system of this specification can accurately control the coordinated operation of the inlet valve and the working seal in a power failure state.

Description

Technical Field

[0001] One or more embodiments of this specification relate to the technical field of inlet valve control, and particularly to an inlet valve and a hydraulic control system for working seals. Background Art

[0002] The inlet valve is the most important safety equipment in the underground powerhouse of a pumped-storage power station. When the inlet valve is in the shutdown state, the valve flap is closed and the working seal is engaged; when the inlet valve is opened, the working seal must be disengaged first, and then the valve flap of the inlet valve is opened to allow water flow through; when the inlet valve is closed, the valve flap of the inlet valve must be closed first, and after ensuring full closure, the working seal is engaged again.

[0003] When the system is powered on, the control system (for example, a control system implemented based on a PLC controller) can be used to control the working states of the inlet valve and the working seal to ensure their normal sequential operation. However, when the system is powered off, the control system fails and cannot control the inlet valve and the working seal. In this case, to ensure the safety of the pumped-storage power station and avoid the phenomenon that the inlet valve cannot be closed under the power-off state, the general design requirement is that the inlet valve should have both the ability to close when powered on and the ability to close when powered off.

[0004] To achieve the function of the inlet valve closing when powered off, under the power-off state, the hydraulic control system of the inlet valve should be able to control the valve flap of the inlet valve to close automatically and at the same time control the working seal to be engaged automatically. The key to realizing this function is that the hydraulic control system can accurately control the coordinated operation of the valve flap closing when powered off and the working seal being engaged automatically when powered off. If the working seal is engaged automatically during the closing process of the valve flap, it will cause damage to the working seal of the inlet valve and result in serious economic losses. Summary of the Invention

[0005] In view of this, the purpose of one or more embodiments of this specification is to propose a hydraulic control system for an inlet valve and a working seal, which can accurately control the coordinated operation of the inlet valve and the working seal under the power-off state.

[0006] Based on the above purpose, one or more embodiments of this specification provide a hydraulic control system for an inlet valve and a working seal, including: an inlet valve control oil circuit, and a working seal control water circuit that cooperates with the inlet valve control oil circuit;

[0007] The inlet valve control oil circuit includes: a full-closed feedback oil pipeline of the inlet valve, and a power-off detection solenoid valve and a full-closed induction stroke valve of the inlet valve controlled by the opening and closing positions of the inlet valve servomotor are provided on the full-closed feedback oil pipeline of the inlet valve;

[0008] The working seal control water circuit includes: a first operating water pipeline connected to the working seal input cavity, a second operating water pipeline connected to the working seal withdrawal cavity, a working seal control valve connected to the first operating water pipeline and the second operating water pipeline, a first isolation valve, a water source lock valve, a water inlet valve water filter, and a water inlet valve seal operation water intake valve connected to the first operating water pipeline, and a second isolation valve connected to the second operating water pipeline;

[0009] The P end of the power failure detection solenoid valve is connected to the hydraulic operating end of the working seal control valve, and the fully closed feedback oil pipeline of the water inlet valve is connected to the hydraulic operating end of the water source lock valve; in the power failure state, the water inlet valve actuator switches to the fully closed position, the water inlet valve flap closes, the fully closed feedback oil pipeline of the water inlet valve is depressurized, the operating water enters the working seal input cavity through the first operating water pipeline and each valve thereon, and the operating water in the working seal withdrawal cavity is discharged through the second operating water pipeline and each valve thereon, and the working seal is automatically put into operation.

[0010] Optionally, in the power failure state, the water inlet valve actuator switches from the fully open position to the fully closed position, the fully closed induction stroke valve of the water inlet valve switches from the parallel position to the cross position, and the fully closed feedback oil pipeline of the water inlet valve is depressurized; the P end and the C end of the power failure detection solenoid valve are connected, and the working seal control valve switches from the parallel position to the cross position; the P end and the D end of the water source lock valve are connected;

[0011] The operating water from the water inlet valve seal operation water intake valve enters the working seal input cavity through the first operating water pipeline, the water inlet valve water filter, the P end and the D end of the water source lock valve, the cross position of the working seal control valve, and the first isolation valve; the operating water in the working seal withdrawal cavity is discharged through the second operating water pipeline, the second isolation valve, and the cross position of the working seal control valve.

[0012] Optionally, an accumulator is provided on the fully closed feedback oil pipeline of the water inlet valve; in the power failure state, the water inlet valve actuator switches to the fully closed position, the water inlet valve flap starts to close, and under the action of the accumulator, the fully closed feedback oil pipeline of the water inlet valve is depressurized with a time delay, the operating water in the working seal input cavity is discharged through the first operating water pipeline and each valve thereon, the operating water in the working seal withdrawal cavity is discharged through the second operating water pipeline and each valve thereon, and the working seal is not put into operation temporarily; when the energy of the accumulator is released completely, the water inlet valve flap is completely closed, the fully closed feedback oil pipeline of the water inlet valve is depressurized, and the operating water enters the working seal input cavity through the first operating water pipeline and each valve thereon, and the working seal is automatically put into operation.

[0013] Optionally, in the power-off state, under the action of the accumulator, the oil in the full-closed feedback oil pipeline of the water inlet valve is depressurized with a time delay, the working seal control valve remains in the parallel position, and the P end and the A end of the water source lock valve remain in a connected state; the P end and the C end of the power-off detection solenoid valve are connected;

[0014] The operating water in the working seal input cavity is discharged through the first operating water pipeline, the first isolation valve, the parallel position of the working seal control valve, and the P end and the A end of the water source lock valve; the operating water in the working seal withdrawal cavity is discharged through the second operating water pipeline, the second isolation valve, and the parallel position of the working seal control valve;

[0015] When the energy of the accumulator is released completely, the valve flap of the water inlet valve is completely closed, the working seal control valve is switched from the parallel position to the cross position, and the P end and the D end of the water source lock valve are connected;

[0016] The operating water from the operating water intake valve of the water inlet valve seal passes through the first operating water pipeline, the water inlet valve water filter, the P end and the D end of the water source lock valve, the cross position of the working seal control valve, and the first isolation valve and enters the working seal input cavity, and the working seal starts to be engaged under the action of the operating water.

[0017] Optionally, the oil valve of the accumulator is vertically installed on the full-closed feedback oil pipeline of the water inlet valve.

[0018] Optionally, the accumulator is filled with inert gas at a predetermined pressure so that when the valve flap of the water inlet valve is completely closed, the working seal is automatically engaged.

[0019] Optionally, the predetermined pressure is lower than 90% of the minimum pressure of the water inlet valve oil pressure system and higher than 25% of the maximum pressure of the water inlet valve oil pressure system.

[0020] Optionally, the full-closed feedback oil pipeline of the water inlet valve is connected to a pressure oil tank for supplying control oil, and the oil pressure of the pressure oil tank is greater than the predetermined pressure.

[0021] Optionally, the accumulator is filled with nitrogen at a pressure of 3.5 MPa.

[0022] Optionally, during the process of the water inlet valve servomotor switching from the fully open position to the fully closed position, the wedge-shaped arm on the arm handle of the water inlet valve servomotor contacts the full-closed induction stroke valve of the water inlet valve, and the stroke rod of the full-closed induction stroke valve of the water inlet valve moves downward under the contact action of the upper cam and the wedge-shaped arm. When the stroke rod of the full-closed induction stroke valve of the water inlet valve has experienced a predetermined stroke, the full-closed induction stroke valve of the water inlet valve is switched from the parallel position to the cross position.

[0023] As can be seen from the above, the hydraulic control system of the water inlet valve and the working seal provided by one or more embodiments of this specification includes a water inlet valve control oil circuit and a working seal control water circuit that cooperates with the water inlet valve control oil circuit; in the power-off state, through the cooperative control of the water inlet valve and the working seal by the water inlet valve control oil circuit and the working seal control water circuit, the automatic closing function of the water inlet valve during power-off can be achieved, and at the same time, it is ensured that the working seal can be automatically put into operation. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in one or more embodiments of this specification or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only one or more embodiments of this specification. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 Schematic diagram of the principle of the hydraulic control system for one or more embodiments of this specification;

[0026] Figure 2 Partial structural schematic diagram of the water inlet valve servomotor and the fully closed induction stroke valve MV404 of the water inlet valve for one or more embodiments of this specification;

[0027] Figure 3 Schematic diagram of the principle of the hydraulic control system for another embodiment of this specification;

[0028] Figure 4 Simplified structural schematic diagram of the accumulator for one or more embodiments of this specification. Detailed Embodiments

[0029] To make the purpose, technical solutions, and advantages of this disclosure clearer, the following will further describe this disclosure in detail with reference to specific embodiments and the accompanying drawings.

[0030] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in one or more embodiments of this specification should have the ordinary meanings understood by those of ordinary skill in the art to which this disclosure pertains. The terms "first", "second" and similar words used in one or more embodiments of this specification do not denote any order, quantity or importance, but are only used to distinguish different components. Words such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to represent relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0031] As Figure 1 shown, one or more embodiments of this specification provide a hydraulic control system for an inlet valve and a working seal, including: an inlet valve control oil circuit, and a working seal control water circuit cooperating with the inlet valve control oil circuit;

[0032] The inlet valve control oil circuit includes: an inlet valve fully closed feedback oil pipeline, on which there are an inlet valve fully closed induction stroke valve MV404 and a power failure detection solenoid valve EV403 controlled by the open and closed positions of the inlet valve servomotor;

[0033] The working seal control water circuit includes: a first operation water pipeline connected to the working seal input cavity, a second operation water pipeline connected to the working seal output cavity, a working seal control valve HV402 connected to the first operation water pipeline and the second operation water pipeline, a second isolation valve MV421 connected to the second operation water pipeline, a first isolation valve MV420, a water source lock valve HV401, a water filter WF401 for the inlet valve and an inlet valve seal operation water intake valve MV411 connected to the first operation water pipeline;

[0034] The P end of the power failure detection solenoid valve EV403 is connected to the hydraulic operation end of the working seal control valve HV402, and the inlet valve fully closed feedback oil pipeline is connected to the hydraulic operation end of the water source lock valve HV401; in the power failure state, the inlet valve servomotor switches to the fully closed position, the inlet valve flap closes, the inlet valve fully closed feedback oil pipeline is depressurized, the operating water enters the working seal input cavity through the first operation water pipeline and the valves thereon, and the operating water in the working seal output cavity is discharged through the second operation water pipeline and the valves thereon. Under the pressure difference between the working seal input cavity and the output cavity, the working seal is automatically engaged.

[0035] Combined with Figure 1As shown, the working process of the hydraulic control system of this embodiment is as follows:

[0036] When the inlet valve is in the open state, the inlet valve flap is fully open, the inlet valve servomotor is in the fully open position, and the working seal is retracted.

[0037] When the control power supply loses power, the inlet valve servomotor switches from the fully open position to the fully closed position to ensure that the inlet valve flap closes. During the closing process of the inlet valve flap, the wedge arm on the arm of the inlet valve servomotor contacts the fully closed induction stroke valve MV404 of the inlet valve, and the fully closed induction stroke valve MV404 of the inlet valve switches from the parallel position to the cross position.

[0038] The control oil provided by the pressure oil tank PV101 to the fully closed feedback oil pipeline of the inlet valve is cut off by the cross position of the fully closed induction stroke valve MV404 of the inlet valve, and the control oil cannot flow into the fully closed feedback oil pipeline of the inlet valve. At the same time, the control oil in the fully closed feedback oil pipeline of the inlet valve flows back to the oil return tank through the cross position of the fully closed induction stroke valve MV404 of the inlet valve, resulting in a rapid pressure relief in the fully closed feedback oil pipeline of the inlet valve.

[0039] Due to the power loss, the P terminal and the C terminal of the power loss detection solenoid valve EV403 are connected. Due to the pressure relief in the fully closed feedback oil pipeline of the inlet valve, the control oil of the working seal control valve HV402 flows back to the fully closed feedback oil pipeline of the inlet valve through the P terminal and the C terminal of the power loss detection solenoid valve EV403. Under the action of the spring, the working seal control valve HV402 switches from the parallel position to the cross position.

[0040] Due to the pressure relief in the fully closed feedback oil pipeline of the inlet valve, the control oil of the water source lock valve HV401 flows back to the oil return tank. Under the action of the spring, the P terminal and the D terminal of the water source lock valve HV401 are connected, and the first operation water pipeline is connected through the P terminal and the D terminal of the water source lock valve HV401.

[0041] The operation water from the inlet valve seal operation water intake valve MV411 passes through the first operation water pipeline, the inlet valve water filter WF401 on it, the P terminal and the D terminal of the water source lock valve HV401, the cross position of the working seal control valve HV402, and the first isolation valve MV420 and enters the working seal input cavity.

[0042] At the same time, the operation water in the working seal retraction cavity passes through the second operation water pipeline, the second isolation valve MV421 on it, and the cross position of the working seal control valve HV402 and enters the drainage pipeline for discharge. As the operation water flows into the working seal input cavity and the operation water in the working seal retraction cavity flows out, a pressure difference is generated between the working seal input cavity and the retraction cavity. Under the action of the pressure difference, the working seal is automatically engaged.

[0043] In the hydraulic control system of the inlet valve and the working seal in this embodiment, in the power-off state, through the cooperation control of the inlet valve control oil circuit and the working seal control water circuit on the inlet valve and the working seal, the automatic closing function of the inlet valve during power-off can be achieved, and at the same time, it is ensured that the working seal can be automatically put into operation.

[0044] As Figure 2 shown, in this embodiment, when the control power supply is powered off, the closing of the inlet valve flap and the automatic engagement of the working seal are controlled through the mechanical cooperation between the wedge-shaped arm 10 on the inlet valve servomotor arm and the full-closed induction stroke valve MV404 of the inlet valve.

[0045] Specifically, during the process of the inlet valve servomotor switching from the fully open position to the fully closed position, the inlet valve flap performs a closing action. When the inlet valve flap is about to be completely closed, the wedge-shaped arm 10 on the inlet valve servomotor arm starts to contact the full-closed induction stroke valve MV404 of the inlet valve. The stroke rod 20 of the full-closed induction stroke valve MV404 of the inlet valve starts to move downward under the contact action of the upper cam 11 and the wedge-shaped arm 10, and experiences the pre-action stroke, commutation stroke, and over-travel stages. When the stroke rod 20 of the full-closed induction stroke valve MV404 of the inlet valve has experienced a predetermined stroke, the full-closed induction stroke valve MV404 of the inlet valve switches from the parallel position to the cross position, thereby triggering the automatic engagement of the working seal.

[0046] Ideally, at the moment when the inlet valve flap is completely closed, the stroke rod 20 of the full-closed induction stroke valve MV404 of the inlet valve should exactly experience the predetermined stroke, so that the working seal is exactly engaged. In actual situations, due to installation errors, it cannot be guaranteed that the working seal is actually engaged while the inlet valve flap is completely closed. In some cases, before the inlet valve flap is completely closed, the working seal has already started to be engaged. In this case, the working seal may be scratched with the fixed seal ring fixed on the inlet valve flap during the engagement process, resulting in damage to the working seal.

[0047] In some embodiments, to make up for the deficiency in the mechanical cooperation between the inlet valve servomotor and the full-closed induction stroke valve MV404 of the inlet valve, ensure that the working seal starts to be engaged while the inlet valve flap is completely closed, and avoid damage to the working seal. As Figure 3 shown, an accumulator PV401 for delaying the pressure relief of the control oil is added to the full-closed feedback oil pipeline of the inlet valve. During the pressure relief process of the full-closed feedback oil pipeline of the inlet valve, the accumulator PV401 is used to control the process of delaying the pressure relief of the control oil, so as to avoid the situation that the working seal is automatically engaged when the inlet valve flap is not completely closed due to the instantaneous pressure relief of the control oil in the full-closed feedback oil pipeline of the inlet valve.

[0048] In some embodiments, the oil valve of the accumulator PV401 is vertically installed on the full-closed feedback oil pipeline of the water inlet valve and fixed with a clamp. In the power-off state, the servomotor of the water inlet valve switches to the full-closed position, and the valve flap of the water inlet valve starts to close. Under the action of the accumulator PV401, the full-closed feedback oil pipeline of the water inlet valve delays pressure relief. The operating water in the working seal input cavity is discharged through the first operating water pipeline and each valve thereon, and the operating water in the working seal withdrawal cavity is discharged through the second operating water pipeline and each valve thereon. The working seal is not put into operation temporarily. When the energy of the accumulator PV401 is released completely, the valve flap of the water inlet valve is completely closed, the full-closed feedback oil pipeline of the water inlet valve is depressurized, and the operating water enters the working seal input cavity through the first operating water pipeline and each valve thereon, and the working seal is automatically put into operation.

[0049] As Figure 4 shown, the accumulator includes a housing 30. A bladder 31 is arranged inside the housing 30. An inflation valve 32 and an oil valve 33 are respectively arranged at two ends of the housing 30. In use, an inert gas (for example, nitrogen) with a predetermined pressure is filled into the bladder 31 through the inflation valve 32, and the oil valve 33 is communicated with the full-closed feedback oil pipeline of the water inlet valve. When the oil pressure in the full-closed feedback oil pipeline of the water inlet valve is greater than the gas pressure in the bladder 31, the control oil in the full-closed feedback oil pipeline of the water inlet valve enters the accumulator PV401 through the oil valve 33, and the entered control oil compresses the inert gas in the bladder 31, and the accumulator PV401 stores energy; when the oil pressure in the full-closed feedback oil pipeline of the water inlet valve is less than the gas pressure in the bladder 31, the inert gas in the bladder 31 starts to expand, and the control oil in the accumulator PV401 flows to the full-closed feedback oil pipeline of the water inlet valve under pressure through the oil valve 33, and the accumulator PV401 releases energy.

[0050] In some embodiments, by adjusting the pressure of the inert gas filled in the accumulator PV401, the cooperation timing between the closing of the valve flap of the water inlet valve and the putting into operation of the working seal is accurately controlled, so that when the valve flap of the water inlet valve is completely closed, the working seal is automatically put into operation, avoiding damage to the working seal caused by premature putting into operation. In some ways, the pressure of the inert gas filled should be lower than 90% of the lowest pressure (for example, 5 MPa) of the oil pressure system of the water inlet valve and higher than 25% of the highest pressure (for example, 6.5 MPa) of the oil pressure system of the water inlet valve.

[0051] Combined with Figure 3 shown, the working process of the hydraulic control system of this embodiment is as follows:

[0052] When the inlet valve is in the open state, the inlet valve flap is fully open, the inlet valve servomotor is in the fully open position, and the working seal is retracted; at this time, the oil pressure of the control oil in the full-closed feedback oil pipeline of the inlet valve is the oil pressure of the pressure oil tank PV101 (for example, the oil pressure of the pressure oil tank is 6.3 MPa), and the accumulator PV401 is filled with inert gas at a predetermined pressure (for example, the precharged nitrogen pressure is 3.5 MPa). Since the oil pressure in the full-closed feedback oil pipeline of the inlet valve is greater than the gas pressure in the accumulator PV401, the control oil flows into the accumulator PV401, and the accumulator PV401 stores energy;

[0053] When the control power supply is de-energized, the inlet valve servomotor switches from the fully open position to the fully closed position to ensure that the inlet valve flap is closed; during the closing process of the inlet valve flap, the wedge arm 10 on the arm of the inlet valve servomotor contacts the full-closed induction stroke valve MV404 of the inlet valve, and the full-closed induction stroke valve MV404 of the inlet valve switches from the parallel position to the cross position;

[0054] The control oil provided by the pressure oil tank PV101 to the full-closed feedback oil pipeline of the inlet valve is cut off by the cross position of the full-closed induction stroke valve MV404 of the inlet valve, and the control oil cannot flow into the full-closed feedback oil pipeline of the inlet valve; at the same time, the control oil in the full-closed feedback oil pipeline of the inlet valve flows back to the return oil tank through the cross position of the full-closed induction stroke valve MV404 of the inlet valve, resulting in pressure relief in the full-closed feedback oil pipeline of the inlet valve;

[0055] During the pressure relief process of the full-closed feedback oil pipeline of the inlet valve, when the oil pressure in the full-closed feedback oil pipeline of the inlet valve drops below the gas pressure in the accumulator PV401, the control oil in the accumulator PV401 is discharged into the full-closed feedback oil pipeline of the inlet valve to provide temporary oil pressure supplement for the control oil in the full-closed feedback oil pipeline of the inlet valve, realizing the delayed release of the oil pressure in the full-closed feedback oil pipeline of the inlet valve, so that the control oil does not completely flow back to the return oil tank through the cross position of the full-closed induction stroke valve MV404 of the inlet valve, thus avoiding rapid instantaneous pressure relief in the full-closed feedback oil pipeline of the inlet valve; at the same time, the control oil in the accumulator PV401 flows into the full-closed feedback oil pipeline of the inlet valve, so that the working seal control valve HV402 remains in the parallel position, and the P end and the A end of the water source lock valve HV401 remain in the connected state;

[0056] Due to power failure, the P end and the C end of the power failure detection solenoid valve EV403 are connected;

[0057] The operating water in the working seal input cavity passes through the first operating water pipeline, the first isolation valve MV420 thereon, the parallel position of the working seal control valve HV402, and the P end and the A end of the water source lock valve HV401 and enters the drainage pipeline for discharge;

[0058] The operating water in the working seal withdrawal cavity enters the drain pipeline through the second operating water pipeline and the parallel position of the second isolation valve MV421 and the working seal control valve HV402 thereon. Since there is no water pressure in both the working seal insertion cavity and the withdrawal cavity, the working seal cannot be inserted;

[0059] When the energy of the accumulator PV401 is completely released and the inlet valve flap is fully closed (by adjusting the pressure of the gas filled in the accumulator PV401 to ensure that the energy of the accumulator PV401 is completely released and the inlet valve flap is fully closed), the pressure flowing from the accumulator PV401 to the fully closed feedback oil pipeline of the inlet valve disappears. At this time, the working seal control valve HV402 switches from the parallel position to the cross position, and the P end and the D end of the water source lock valve HV401 are connected;

[0060] The operating water from the operating water intake valve MV411 of the inlet valve seal operation passes through the first operating water pipeline, the inlet valve water filter WF401 thereon, the P end and the D end of the water source lock valve HV401, the cross position of the working seal control valve HV402, and the first isolation valve MV420 to enter the working seal insertion cavity, and the working seal starts to be inserted under the action of the operating water. In this way, under the action of the delayed pressure relief of the accumulator PV401, it can be ensured that when the inlet valve flap is fully closed, the working seal is automatically inserted, avoiding damage caused by the premature insertion of the working seal.

[0061] In the hydraulic control system of the inlet valve and the working seal of this embodiment, an accumulator is added to the inlet valve control oil circuit, and an inert gas with a predetermined pressure is pre-filled in the accumulator; in the power-off state, through the coordinated control of the inlet valve and the working seal by the inlet valve control oil circuit and the working seal control water circuit, and the delayed pressure relief effect of the accumulator on the inlet valve control oil circuit, it can be realized that when the inlet valve flap automatically closes completely during power-off, the working seal is automatically inserted, so as to ensure that the working seal is not damaged on the premise that the inlet valve has the ability to close during power-off.

[0062] Those of ordinary skill in the art should understand that the discussion of any above embodiment is only exemplary and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples; under the idea of the present disclosure, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of one or more embodiments of the present specification as described above, which are not provided in detail for the sake of brevity.

[0063] In addition, for simplicity of explanation and discussion, and so as not to make one or more embodiments of this specification difficult to understand, well-known power / ground connections to integrated circuit (IC) chips and other components may or may not be shown in the provided drawings. Further, the devices may be shown in block diagram form in order to avoid making one or more embodiments of this specification difficult to understand, and this also takes into account the fact that details regarding the implementation of these block diagram devices are highly dependent on the platform on which one or more embodiments of this specification will be implemented (i.e., these details should be fully within the understanding of those of ordinary skill in the art). In cases where specific details (such as circuits) are set forth to describe exemplary embodiments of the present disclosure, it will be apparent to those of ordinary skill in the art that one or more embodiments of this specification may be practiced without these specific details or with variations of these specific details. Accordingly, these descriptions are to be regarded as illustrative rather than restrictive.

[0064] Although the present disclosure has been described in connection with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art based on the foregoing description. For example, other memory architectures (such as dynamic RAM (DRAM)) may be used with the embodiments discussed.

[0065] One or more embodiments of this specification are intended to cover all such alternatives, modifications, and variations that fall within the broad scope of the appended claims. Accordingly, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments of this specification shall be included within the scope of protection of the present disclosure.

Claims

1. A hydraulic control system for an inlet valve and a working seal, characterized in that, it includes: an inlet valve control oil circuit and a working seal control water circuit cooperating with the inlet valve control oil circuit; The inlet valve control oil circuit includes: a fully closed feedback oil pipeline of the inlet valve, on which a power failure detection solenoid valve and a fully closed induction stroke valve of the inlet valve controlled by the opening and closing positions of the inlet valve servomotor are provided; a accumulator for delaying the pressure relief of the control oil is provided on the fully closed feedback oil pipeline of the inlet valve, and the oil valve of the accumulator is vertically installed on the fully closed feedback oil pipeline of the inlet valve. The accumulator is filled with inert gas at a predetermined pressure, so that when the inlet valve flap is completely closed, the working seal is automatically put into operation; The working seal control water circuit includes: a first operation water pipeline connected to the working seal input chamber, a second operation water pipeline connected to the working seal output chamber, a working seal control valve connected to the first operation water pipeline and the second operation water pipeline, a first isolation valve, a water source lock valve, an inlet valve water filter and an inlet valve seal operation water intake valve connected to the first operation water pipeline, and a second isolation valve connected to the second operation water pipeline; The P end of the power failure detection solenoid valve is connected to the hydraulic operation end of the working seal control valve, and the fully closed feedback oil pipeline of the inlet valve is connected to the hydraulic operation end of the water source lock valve; in the power failure state, the inlet valve servomotor switches to the fully closed position, the inlet valve flap closes, the fully closed feedback oil pipeline of the inlet valve is depressurized, the operation water enters the working seal input chamber through the first operation water pipeline and each valve thereon, and the operation water in the working seal output chamber is discharged through the second operation water pipeline and each valve thereon, and the working seal is automatically put into operation.

2. The hydraulic control system according to claim 1, characterized in that, in the power failure state, the inlet valve servomotor switches from the fully open position to the fully closed position, the fully closed induction stroke valve of the inlet valve switches from the parallel position to the cross position, and the fully closed feedback oil pipeline of the inlet valve is depressurized; the P end and the C end of the power failure detection solenoid valve are communicated, and the working seal control valve switches from the parallel position to the cross position; the P end and the D end of the water source lock valve are communicated; The operation water from the inlet valve seal operation water intake valve enters the working seal input chamber through the first operation water pipeline, the inlet valve water filter, the communication between the P end and the D end of the water source lock valve, the cross position of the working seal control valve, and the first isolation valve; the operation water in the working seal output chamber is discharged through the second operation water pipeline, the second isolation valve, and the cross position of the working seal control valve.

3. The hydraulic control system according to claim 1, characterized in that, Under the power-off state, the servomotor of the inlet valve switches to the fully closed position, and the valve flap of the inlet valve starts to close. Under the action of the accumulator, the oil pipeline for feedback of the fully closed inlet valve delays pressure relief. The operating water in the working seal input chamber is discharged through the first operating water pipeline and each valve thereon. The operating water in the working seal withdrawal chamber is discharged through the second operating water pipeline and each valve thereon, and the working seal is not put into operation temporarily. When the energy of the accumulator is released completely, the valve flap of the inlet valve is completely closed, the oil pipeline for feedback of the fully closed inlet valve relieves pressure, and the operating water enters the working seal input chamber through the first operating water pipeline and each valve thereon, and the working seal is automatically put into operation.

4. The hydraulic control system according to claim 3, characterized in that under the power-off state, under the action of the accumulator, the oil pipeline for feedback of the fully closed inlet valve delays pressure relief, the working seal control valve remains in the parallel position, and the P end and the A end of the water source lock valve remain in the connected state; the P end and the C end of the power-off detection solenoid valve are connected; the operating water in the working seal input chamber is discharged through the first operating water pipeline, the first isolation valve, the parallel position of the working seal control valve, and the P end and the A end of the water source lock valve; the operating water in the working seal withdrawal chamber is discharged through the second operating water pipeline, the second isolation valve, and the parallel position of the working seal control valve; when the energy of the accumulator is released completely, the valve flap of the inlet valve is completely closed, the working seal control valve switches from the parallel position to the cross position, and the P end and the D end of the water source lock valve are connected; the operating water from the inlet valve seal operation water intake valve enters the working seal input chamber through the first operating water pipeline, the inlet valve water filter, the P end and the D end of the water source lock valve, the cross position of the working seal control valve, and the first isolation valve, and the working seal starts to be put into operation under the action of the operating water.

5. The hydraulic control system according to claim 1, characterized in that the predetermined pressure is lower than 90% of the minimum pressure of the inlet valve oil pressure system and higher than 25% of the maximum pressure of the inlet valve oil pressure system.

6. The hydraulic control system according to claim 1, characterized in that the oil pipeline for feedback of the fully closed inlet valve is connected to the pressure oil tank for providing control oil, and the oil pressure of the pressure oil tank is greater than the predetermined pressure.

7. The hydraulic control system according to claim 1, characterized in that nitrogen with a pressure of 3.5 MPa is filled in the accumulator.

8. The hydraulic control system according to claim 1, characterized in that during the process of the servomotor of the inlet valve switching from the fully open position to the fully closed position, the wedge-shaped arm on the servomotor arm of the inlet valve contacts the fully closed inlet valve induction stroke valve, and the stroke rod of the fully closed inlet valve induction stroke valve moves downward under the contact action of the upper cam and the wedge-shaped arm. When the stroke rod of the fully closed inlet valve induction stroke valve experiences a predetermined stroke, the fully closed inlet valve induction stroke valve switches from the parallel position to the cross position.

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