Hydraulic control device and control method for emergency distributing valve of hydraulic system of speed regulator

Abstract

The invention provides a speed regulator hydraulic system emergency distributing valve hydraulic control device and method. The speed regulator hydraulic system emergency distributing valve hydraulic control device comprises an emergency distributing valve body, an emergency distributing valve element is arranged in the emergency distributing valve body, and the center of the bottom end of the emergency distributing valve element is connected with a valve element connecting rod; the side face of the emergency distributing valve body is connected with a servomotor. An upper cavity of the emergency distributing valve body is connected with the main distributing valve and the electromagnetic control valve at the same time, the electromagnetic control valve is connected with an emergency distributing valve control oil first pipeline, and a lower cavity of the emergency distributing valve body is connected with an emergency distributing valve control oil second pipeline. The bottom end of the valve element connecting rod is matched with the emergency distributing valve position sensor set, and the emergency distributing valve position sensor set is fixedly installed on the sensor installation support. The problems that in the prior art, the control precision is low, the structure is complex, the automation degree is not high, and safety is poor are solved, and the operation stability, reliability and the intelligent level of a speed regulator hydraulic system are improved.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic control of a hydraulic system of a speed governor in a hydropower plant, and in particular to a hydraulic control device and a control method for an emergency pressure distribution valve of a hydraulic system of a speed governor. Background Art

[0002] In the application of the governor hydraulic system, the emergency pressure distribution valve is one of the key components. It is responsible for the emergency closure of the guide vanes in various emergency situations that may occur during the operation of the hydraulic system. The hydraulic control device of the emergency pressure distribution valve in the existing governor hydraulic system has many shortcomings. The details are as follows: (1) The existing emergency pressure regulating valve has low control accuracy and cannot meet the system's operating requirements to accurately switch and control the hydraulic oil circuit. As a result, during the operation of the speed regulator, it cannot respond quickly and accurately to various working conditions, affecting the stability and reliability of the entire speed regulation system.

[0003] (2) The existing emergency pressure distribution valve hydraulic control device has a complex structure, numerous parts, and high assembly process requirements. This not only increases manufacturing costs and production difficulty, but also makes the maintenance and repair of the device cumbersome. During long-term operation, due to wear and aging between components, leakage, jamming and other faults are prone to occur. Once a fault occurs, it is difficult to locate and repair it, which will lead to prolonged equipment downtime and cause significant economic losses to production and operation.

[0004] (3) The existing device has a relatively low level of automation and intelligent control, and intelligent monitoring and control have not yet been achieved. Information such as the actual operating status of the emergency pressure distribution valve and the position of the valve core cannot be accurately obtained and fed back in real time. The actual operating status of the device cannot be accurately judged, and real-time monitoring and automatic control cannot be achieved, which reduces the intelligence level of the entire system. Summary of the Invention

[0005] The purpose of the present invention is to provide a hydraulic control device and control method for an emergency pressure regulating valve of a speed regulator hydraulic system, so as to solve the problems existing in the prior art such as low control accuracy, complex structure, low degree of automation and poor safety, and to improve the operating stability, reliability and intelligence level of the speed regulator hydraulic system.

[0006] In order to achieve the above technical features, the object of the present invention is achieved as follows: a hydraulic control device for an emergency pressure-regulating valve in a speed governor hydraulic system includes an emergency pressure-regulating valve body, an emergency pressure-regulating valve spool is disposed inside the emergency pressure-regulating valve body, a spool connecting rod is connected to the bottom center of the emergency pressure-regulating valve spool; a servomotor is connected to the side of the emergency pressure-regulating valve body; The upper cavity of the emergency pressure regulating valve body is connected to the main pressure regulating valve and the electromagnetic control valve at the same time. The electromagnetic control valve is connected to the first pipeline of the emergency pressure regulating valve control oil, and the lower cavity of the emergency pressure regulating valve body is connected to the second pipeline of the emergency pressure regulating valve control oil. The bottom end of the valve core connecting rod cooperates with the emergency pressure distribution valve position sensor group, and the emergency pressure distribution valve position sensor group is fixedly mounted on the sensor mounting bracket.

[0007] Preferably, the emergency pressure regulating valve position sensor group includes an emergency pressure regulating valve exit position sensor and an emergency pressure regulating valve input position sensor which are sequentially installed on the sensor mounting bracket, and the emergency pressure regulating valve exit position sensor and the emergency pressure regulating valve input position sensor are respectively matched with the outer wall of the valve core connecting rod.

[0008] Preferably, the emergency pressure regulating valve exit position sensor and the emergency pressure regulating valve input position sensor are respectively connected to the control system via signal lines.

[0009] Preferably, the emergency pressure-regulating valve body is connected to the corresponding main pressure-regulating valve, servomotor and electromagnetic control valve through the emergency pressure-regulating valve oil supply pipe.

[0010] Preferably, the valve core connecting rod is designed in a cylindrical structure and is welded to the valve core of the emergency pressure regulating valve as an integral design; The spool of the emergency pressure-regulating valve realizes the movement of the spool of the emergency pressure-regulating valve through the oil source pressure difference between the upper chamber and the lower chamber. The spool of the emergency pressure-regulating valve is directly connected to the spool connecting rod. The movement of the spool of the emergency pressure-regulating valve drives the synchronous movement of the spool connecting rod; when the pressure in the upper chamber is greater than the pressure in the lower chamber, that is, the first pipeline of the emergency pressure-regulating valve control oil is connected to the pressure oil, the second pipeline of the emergency pressure-regulating valve control oil is connected to the return oil, and the spool of the emergency pressure-regulating valve and the spool connecting rod move downward; when the pressure in the upper chamber is less than the pressure in the lower chamber, that is, the second pipeline of the emergency pressure-regulating valve control oil is connected to the pressure oil, the first pipeline of the emergency pressure-regulating valve control oil is connected to the return oil, and the spool of the emergency pressure-regulating valve and the spool connecting rod move upward.

[0011] Another aspect of the present invention provides a control method for a hydraulic control device of an emergency pressure distribution valve of a speed regulator hydraulic system: Under normal operation or shutdown conditions of the unit, the electromagnetic control valve is in the reset state, that is, the oil circuit is closed, that is, the first pipeline of the emergency pressure regulating valve control oil and the upper chamber of the emergency pressure regulating valve body are not connected to the oil source, the emergency pressure regulating valve spool and the spool connecting rod are in the retracted state, that is, the emergency pressure regulating valve is not in operation; When the electromagnetic control valve of the emergency pressure regulating valve is not excited, the emergency pressure regulating valve is in the reset state, which will disconnect the main pressure regulating valve closing chamber and the servomotor closing chamber from the emergency oil source, disconnect the main pressure regulating valve opening chamber from the servomotor opening chamber and connect the return oil, and the emergency pressure regulating valve spool and spool connecting rod are in the retracted state, so that the servomotor guide vane is not closed, ensuring the safe and stable operation of the unit; When the spool and spool connecting rod of the emergency pressure-regulating valve are in the retracted state, the 101FC proximity switch of the emergency pressure-regulating valve exit position sensor senses the excitation action, the 102FC proximity switch of the emergency pressure-regulating valve engagement position sensor does not sense the excitation, and the normally closed node of the 102FC proximity switch is in the connected state, that is, when the normally open node of the 101FC proximity switch is connected and the normally closed node of the 102FC proximity switch is connected, it is judged that the emergency pressure-regulating valve is in the reset state.

[0012] Preferably, when the unit is shut down due to an accident, the electromagnetic control valve is in an actuated state, the first control oil pipeline of the emergency pressure regulating valve is connected to the upper chamber of the emergency pressure regulating valve body with a pressure oil source, and since the oil source pressure in the upper chamber is greater than the oil source pressure in the lower chamber, the valve core and the valve core connecting rod of the emergency pressure regulating valve are moved downward and are in an extended state, that is, the emergency pressure regulating valve is in actuation; When the electromagnetic control valve of the emergency pressure-regulating valve is actuated, the emergency pressure-regulating valve is in operation, which connects the closed chamber of the main pressure-regulating valve and the closed chamber of the servomotor to the emergency oil source, and connects the open chamber of the main pressure-regulating valve and the open chamber of the servomotor to the return oil. The valve core and the connecting rod of the valve core move downward and are in the extended state, realizing the emergency closing function of the servomotor guide vane, ensuring the safe and rapid shutdown of the unit; When the spool and spool connecting rod of the emergency pressure-regulating valve are in the extended state, the 101FC proximity switch of the emergency pressure-regulating valve exit position sensor senses the excitation and its normally open node is actuated, and the 102FC proximity switch of the emergency pressure-regulating valve input position sensor senses the excitation and its normally open node is actuated, that is, when the normally open nodes of the 101FC proximity switch and the 102FC proximity switch are actuated at the same time, it is judged that the emergency pressure-regulating valve is in the actuating state.

[0013] Preferably, when the hydraulic system pipeline needs to be drained for unit maintenance, the upper and lower chambers of the emergency pressure-regulating valve are both in an oil-free state, but since the valve core and the valve core connecting rod of the emergency pressure-regulating valve move downward under the action of their own weight, the valve core connecting rod is in an extended state, that is, the valve core of the emergency pressure-regulating valve is in action.

[0014] Preferably, when the electromagnetic control valve is actuated, the emergency pressure-regulating valve is in action, which will connect the main pressure-regulating valve closing chamber and the relay closing chamber to the emergency oil source, and the main pressure-regulating valve opening chamber and the relay opening chamber to the return oil. The emergency pressure-regulating valve spool and the spool connecting rod move downward and are in an extended state, realizing the emergency closing function of the relay guide vane, ensuring the safe and rapid shutdown of the unit.

[0015] Preferably, when the electromagnetic control valve is not actuated and excited, the emergency pressure-regulating valve is in a reset state, so that the main pressure-regulating valve closing chamber and the relay closing chamber are not connected to the emergency oil source, the main pressure-regulating valve opening chamber and the relay opening chamber are disconnected and connected to the return oil, and the emergency pressure-regulating valve spool and the spool connecting rod are in a retracted state, so that the relay guide vane is not closed, thereby ensuring the safe and stable operation of the unit.

[0016] Preferably, the 101FC proximity switch of the emergency pressure regulating valve exit position sensor and the 102FC proximity switch of the emergency pressure regulating valve engagement position sensor both use IFM series non-contact proximity switches, with sensing distance: 7mm±10%, M12×1mm, working distance: 0~5.7mm, working voltage: 10~36VDC, current consumption: <10mA, output function: normally open, voltage drop: <2.5V, three-wire output, current load: 100mA, switching frequency: 800Hz, body length: 50mm, angle cable connector: EVC005 / 5m / φ4.9mm, IFM.

[0017] The present invention has the following beneficial effects: 1. The device of the present invention has a relatively simple structure and a reasonably reduced number of parts, which reduces manufacturing costs and production difficulty. Furthermore, the rational layout and connection method make the device assembly and maintenance more convenient, reduce the probability of leakage, jamming and other failures that may arise from the complex structure, and improve the reliability and service life of the device.

[0018] 2. The present invention uses the electromagnetic control valve to precisely control the control oil circuit, which can accurately promote the movement of the emergency pressure distribution valve spool and realize the precise switching of the hydraulic oil circuit, thereby making the action of the relay more accurate and rapid, greatly improving the control accuracy of the governor hydraulic system, and being able to better adapt to various complex working conditions and ensure the stable operation of the unit.

[0019] 3. Utilizing both a closed position sensor and an open position sensor, the present invention can acquire real-time position information about the emergency pressure distribution valve spool and feed this information back to the control system. In an emergency, the solenoid control valve can rapidly respond to control signals and reliably activate the emergency pressure distribution valve spool, ensuring timely activation or deactivation of the emergency pressure distribution valve. This prevents safety incidents caused by malfunction or refusal of the emergency pressure distribution valve, effectively safeguarding the safe operation of the speed governor and the entire unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and examples.

[0021] Figure 1 Schematic diagram of the structure of the device of the present invention.

[0022] In the figure: main pressure-regulating valve 1, relay 2, emergency pressure-regulating valve body 3, emergency pressure-regulating valve oil supply pipe 4, emergency pressure-regulating valve spool 5, spool connecting rod 6, solenoid control valve 7, emergency pressure-regulating valve control oil first pipeline 8, emergency pressure-regulating valve control oil second pipeline 9, emergency pressure-regulating valve exit position sensor 10, emergency pressure-regulating valve input position sensor 11, sensor mounting bracket 12, upper chamber 13, lower chamber 14. DETAILED DESCRIPTION

[0023] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to related embodiments. Several embodiments of the present invention are provided. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] Example 1: See also Figure 1The present invention provides a hydraulic control device for an emergency pressure-regulating valve of a speed regulator hydraulic system, comprising an emergency pressure-regulating valve body 3, wherein an emergency pressure-regulating valve spool 5 is provided inside the emergency pressure-regulating valve body 3, and a spool connecting rod 6 is connected to the bottom center of the emergency pressure-regulating valve spool 5; the side of the emergency pressure-regulating valve body 3 is connected to a servomotor 2; the upper chamber 13 of the emergency pressure-regulating valve body 3 is simultaneously connected to the main pressure-regulating valve 1 and the electromagnetic control valve 7, the electromagnetic control valve 7 is connected to the first pipeline 8 for the control oil of the emergency pressure-regulating valve, and the lower chamber 14 of the emergency pressure-regulating valve body 3 is connected to the second pipeline 9 for the control oil of the emergency pressure-regulating valve; the bottom end of the spool connecting rod 6 cooperates with the emergency pressure-regulating valve position sensor group, and the emergency pressure-regulating valve position sensor group is fixedly mounted on the sensor mounting bracket 12. By adopting the above-mentioned hydraulic control device, the problems of low control accuracy, complex structure, low degree of automation and poor safety existing in the prior art can be solved, and the operational stability, reliability and intelligence level of the speed regulator hydraulic system can be effectively improved.

[0029] Furthermore, the emergency pressure-regulating valve position sensor assembly includes an emergency pressure-regulating valve exit position sensor 10 and an emergency pressure-regulating valve entry position sensor 11, which are sequentially mounted on a sensor mounting bracket 12. The emergency pressure-regulating valve exit position sensor 10 and the emergency pressure-regulating valve entry position sensor 11 are respectively engaged with the outer wall of the spool connecting rod 6. The emergency pressure-regulating valve exit position sensor 10 and the emergency pressure-regulating valve entry position sensor 11 can be used to detect the position of the spool connecting rod 6.

[0030] The installation height of the emergency pressure regulating valve exit position sensor 10 on the sensor mounting bracket 12 is higher than the installation height of the emergency pressure regulating valve input position sensor 11 .

[0031] Furthermore, the emergency pressure regulating valve exit position sensor 10 and the emergency pressure regulating valve engagement position sensor 11 are respectively connected to the control system via signal lines. The automatic monitoring and acquisition of the position of the valve core connecting rod 6 facilitates the subsequent control of the entire governor hydraulic system through the control system.

[0032] Furthermore, the emergency pressure regulating valve body 3 is connected to the corresponding main pressure regulating valve 1, servomotor 2 and electromagnetic control valve 7 through the emergency pressure regulating valve oil supply pipe 4. The use of the emergency pressure regulating valve oil supply pipe 4 ensures a stable and smooth oil supply process.

[0033] Furthermore, the valve core connecting rod 6 is designed in a cylindrical structure and is welded to the emergency pressure regulating valve core 5 as an integral design; by adopting the integrated structural design, its structure is simplified and its stability and reliability are guaranteed.

[0034] Furthermore, the emergency pressure-regulating valve core 5 realizes the movement of the emergency pressure-regulating valve core 5 through the oil source pressure difference between the upper chamber 13 and the lower chamber 14. The emergency pressure-regulating valve core 5 is directly connected to the valve core connecting rod 6. The movement of the emergency pressure-regulating valve core 5 drives the synchronous movement of the valve core connecting rod 6. When the pressure in the upper chamber 13 is greater than the pressure in the lower chamber 14, that is, the emergency pressure-regulating valve control oil first pipeline 8 is connected to the pressure oil, the emergency pressure-regulating valve control oil second pipeline 9 is connected to the return oil, and the emergency pressure-regulating valve core 5 and the valve core connecting rod 6 move downward. When the pressure in the upper chamber 13 is less than the pressure in the lower chamber 14, that is, the emergency pressure-regulating valve control oil second pipeline 9 is connected to the pressure oil, the emergency pressure-regulating valve control oil first pipeline 8 is connected to the return oil, and the emergency pressure-regulating valve core 5 and the valve core connecting rod 6 move upward. By adopting the above-mentioned movement control of the emergency pressure-regulating valve core 5, the corresponding circuit control of the emergency pressure-regulating valve control oil first pipeline 8 and the emergency pressure-regulating valve control oil second pipeline 9 can be achieved.

[0035] Example 2: Another aspect of the present invention provides a control method for a hydraulic control device of an emergency pressure distribution valve of a speed regulator hydraulic system: Under normal operation or shutdown conditions of the unit, the electromagnetic control valve 7 is in the reset state, that is, the oil circuit is closed, that is, the first pipeline 8 of the emergency pressure regulating valve control oil and the upper chamber 13 of the emergency pressure regulating valve body 3 are not connected to the oil source, and the emergency pressure regulating valve spool 5 and the spool connecting rod 6 are in the retracted state, that is, the emergency pressure regulating valve is not in operation; When the electromagnetic control valve 7 of the emergency pressure regulating valve is not excited, the emergency pressure regulating valve is in the reset state, which will disconnect the main pressure regulating valve closing chamber and the relay closing chamber from the emergency oil source, disconnect the main pressure regulating valve opening chamber from the relay opening chamber and connect the return oil, and the emergency pressure regulating valve spool 5 and spool connecting rod 6 are in the retracted state, so that the relay guide vane is not closed, ensuring the safe and stable operation of the unit; When the emergency pressure regulating valve spool 5 and the spool connecting rod 6 are in the retracted state, the 101FC proximity switch of the emergency pressure regulating valve exit position sensor 10 senses the excitation action, the 102FC proximity switch of the emergency pressure regulating valve engagement position sensor 11 does not sense the excitation, and the normally closed node of the 102FC proximity switch is in the connected state, that is, when the normally open node of the 101FC proximity switch is connected and the normally closed node of the 102FC proximity switch is connected, it is judged that the emergency pressure regulating valve is in the reset state.

[0036] Furthermore, when the unit is shut down due to an accident, the electromagnetic control valve 7 is in an actuated state, and the first control oil pipeline 8 of the emergency pressure regulating valve is connected to the upper chamber 13 of the emergency pressure regulating valve body 3 with a pressure oil source. Since the oil source pressure in the upper chamber 13 is greater than the oil source pressure in the lower chamber 14, the spool 5 and the spool connecting rod 6 of the emergency pressure regulating valve are moved downward and are in an extended state, that is, the emergency pressure regulating valve is in actuation; When the electromagnetic control valve 7 of the emergency pressure regulating valve is actuated, the emergency pressure regulating valve is in operation, which will connect the main pressure regulating valve closing chamber and the relay closing chamber to the emergency oil source, and the main pressure regulating valve opening chamber and the relay opening chamber to the return oil. The emergency pressure regulating valve spool 5 and the spool connecting rod 6 move downward and are in the extended state, realizing the emergency closing function of the relay guide vane, ensuring the safe and rapid shutdown of the unit; When the spool 5 and the spool connecting rod 6 of the emergency pressure regulating valve are in the extended state, the 101FC proximity switch of the emergency pressure regulating valve exit position sensor 10 is induced to be excited and its normally open node is activated, and the 102FC proximity switch of the emergency pressure regulating valve input position sensor 11 is induced to be excited and its normally open node is activated, that is, when the normally open nodes of the 101FC proximity switch and the 102FC proximity switch are activated at the same time, it is judged that the emergency pressure regulating valve is in the action state.

[0037] Furthermore, when the hydraulic system pipeline needs to be drained for unit maintenance, the upper chamber 13 and the lower chamber 14 of the emergency pressure regulating valve are both in an oil-free state, but since the emergency pressure regulating valve spool 5 and the spool connecting rod 6 move downward under the action of their own weight, the spool connecting rod 6 is in an extended state, that is, the emergency pressure regulating valve spool 5 is in action.

[0038] Furthermore, when the electromagnetic control valve 7 is actuated, the emergency pressure regulating valve is in action, which will connect the main pressure regulating valve closing chamber and the relay closing chamber to the emergency oil source, and the main pressure regulating valve opening chamber and the relay opening chamber to the return oil. The emergency pressure regulating valve spool 5 and the spool connecting rod 6 move downward and are in an extended state, realizing the emergency closing function of the relay guide vane, ensuring the safe and rapid shutdown of the unit.

[0039] Furthermore, when the electromagnetic control valve 7 is not actuated for excitation, the emergency pressure regulating valve is in a reset state, which will disconnect the main pressure regulating valve closing chamber and the relay closing chamber from the emergency oil source, disconnect the main pressure regulating valve opening chamber and the relay opening chamber from the return oil source, and the emergency pressure regulating valve spool 5 and the spool connecting rod 6 are in a retracted state, so that the relay guide vane is not closed, thereby ensuring the safe and stable operation of the unit.

[0040] Furthermore, the 101FC proximity switch of the emergency pressure regulating valve exit position sensor 10 and the 102FC proximity switch of the emergency pressure regulating valve input position sensor 11 both use IFM series non-contact proximity switches, with sensing distance: 7mm±10%, M12×1mm, working distance: 0~5.7mm, working voltage: 10~36VDC, current consumption: <10mA, output function: normally open, voltage drop: <2.5V, three-wire output, current load: 100mA, switching frequency: 800Hz, body length: 50mm, angle cable connector: EVC005 / 5m / φ4.9mm, IFM.

[0041] Furthermore, the electromagnetic control valve 7 adopts Rexroth brand, R900916984, 4WE 6 D6X / EG220N9K4, Rexroth.

[0042] Furthermore, the emergency pressure regulating valve has a model specification of φ200mm and a pressure resistance level of 10.0Mpa.

[0043] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic control device for an emergency pressure distribution valve of a speed governor hydraulic system, characterized by: The emergency pressure regulating valve comprises an emergency pressure regulating valve body (3), an emergency pressure regulating valve spool (5) is provided inside the emergency pressure regulating valve body (3), a spool connecting rod (6) is connected to the bottom center of the emergency pressure regulating valve spool (5); and a servomotor (2) is connected to the side of the emergency pressure regulating valve body (3); The upper chamber (13) of the emergency pressure regulating valve body (3) is connected to the main pressure regulating valve (1) and the electromagnetic control valve (7) at the same time. The electromagnetic control valve (7) is connected to the first pipeline (8) of the emergency pressure regulating valve control oil. The lower chamber (14) of the emergency pressure regulating valve body (3) is connected to the second pipeline (9) of the emergency pressure regulating valve control oil. The bottom end of the valve core connecting rod (6) cooperates with the emergency pressure distribution valve position sensor group, and the emergency pressure distribution valve position sensor group is fixedly mounted on the sensor mounting bracket (12).

2. A hydraulic control device for an emergency pressure regulating valve of a speed governor hydraulic system according to claim 1, characterized in that: The emergency pressure regulating valve position sensor group comprises an emergency pressure regulating valve exit position sensor (10) and an emergency pressure regulating valve entry position sensor (11) which are sequentially mounted on a sensor mounting bracket (12); the emergency pressure regulating valve exit position sensor (10) and the emergency pressure regulating valve entry position sensor (11) respectively cooperate with the outer wall of the valve core connecting rod (6).

3. The hydraulic control device for the emergency pressure regulating valve of the speed governor hydraulic system according to claim 1, characterized in that: The emergency pressure regulating valve exit position sensor (10) and the emergency pressure regulating valve input position sensor (11) are respectively connected to the control system via signal lines.

4. The hydraulic control device for an emergency pressure regulating valve of a speed governor hydraulic system according to claim 1, characterized in that: The emergency pressure regulating valve body (3) is connected to the corresponding main pressure regulating valve (1), the servomotor (2) and the electromagnetic control valve (7) through the emergency pressure regulating valve oil supply pipe (4).

5. The hydraulic control device for an emergency pressure regulating valve of a speed governor hydraulic system according to claim 1, characterized in that: The valve core connecting rod (6) is designed to be cylindrical in structure and is welded to the emergency pressure regulating valve core (5) to form an integral design; The emergency pressure-regulating valve core (5) realizes the movement of the emergency pressure-regulating valve core (5) through the oil source pressure difference between the upper chamber (13) and the lower chamber (14). The emergency pressure-regulating valve core (5) is directly connected to the core connecting rod (6). The movement of the emergency pressure-regulating valve core (5) drives the synchronous movement of the core connecting rod (6); when the pressure of the upper chamber (13) is greater than the pressure of the lower chamber (14), the emergency pressure-regulating valve control oil first pipeline (8) is connected to the pressure oil, the emergency pressure-regulating valve control oil second pipeline (9) is connected to the return oil, and the emergency pressure-regulating valve core (5) and the core connecting rod (6) move downward; when the pressure of the upper chamber (13) is less than the pressure of the lower chamber (14), the emergency pressure-regulating valve control oil second pipeline (9) is connected to the pressure oil, the emergency pressure-regulating valve control oil first pipeline (8) is connected to the return oil, and the emergency pressure-regulating valve core (5) and the core connecting rod (6) move upward.

6. A control method for a hydraulic control device of an emergency pressure distribution valve of a speed governor hydraulic system according to any one of claims 1 to 5, characterized in that: When the unit is in normal operation or shutdown, the electromagnetic control valve (7) is in a reset state, i.e., the oil circuit is closed, i.e., the first oil circuit pipeline (8) of the emergency pressure regulating valve and the upper chamber (13) of the emergency pressure regulating valve body (3) are not connected to the oil source, and the emergency pressure regulating valve spool (5) and the spool connecting rod (6) are in a retracted state, i.e., the emergency pressure regulating valve is not in operation; When the electromagnetic control valve (7) of the emergency pressure regulating valve is not excited, the emergency pressure regulating valve is in a reset state, which will disconnect the main pressure regulating valve closing chamber and the relay closing chamber from the emergency oil source, disconnect the main pressure regulating valve opening chamber and the relay opening chamber from the return oil source, and the emergency pressure regulating valve spool (5) and the spool connecting rod (6) are in a retracted state, so that the relay guide vane is not closed, thereby ensuring the safe and stable operation of the unit; When the emergency pressure regulating valve spool (5) and the spool connecting rod (6) are in the retracted state, the 101FC proximity switch of the emergency pressure regulating valve exit position sensor (10) senses the excitation action, the 102FC proximity switch of the emergency pressure regulating valve engagement position sensor (11) does not sense the excitation, and the normally closed node of the 102FC proximity switch is in the connected state, that is, when the normally open node of the 101FC proximity switch is connected and the normally closed node of the 102FC proximity switch is connected, it is determined that the emergency pressure regulating valve is in the reset state.

7. The control method of the hydraulic control device of the emergency pressure distribution valve of the speed governor hydraulic system according to claim 6, characterized in that: When the unit is shut down due to an accident, the electromagnetic control valve (7) is in an actuated state, and the first pipeline (8) of the emergency pressure regulating valve control oil is connected to the upper chamber (13) of the emergency pressure regulating valve body (3) with the pressure oil source. Since the oil source pressure of the upper chamber (13) is greater than the oil source pressure of the lower chamber (14), the valve core (5) and the valve core connecting rod (6) of the emergency pressure regulating valve are moved downward and are in an extended state, that is, the emergency pressure regulating valve is in an actuated state; When the electromagnetic control valve (7) of the emergency pressure regulating valve is actuated, the emergency pressure regulating valve is in action, which connects the main pressure regulating valve closing chamber and the servomotor closing chamber to the emergency oil source, connects the main pressure regulating valve opening chamber and the servomotor opening chamber to the return oil, and the emergency pressure regulating valve spool (5) and the spool connecting rod (6) move downward and are in an extended state, realizing the emergency closing function of the servomotor guide vane, thereby ensuring the safe and rapid shutdown of the unit; When the emergency pressure regulating valve spool (5) and the spool connecting rod (6) are in the extended state, the 101FC proximity switch of the emergency pressure regulating valve exit position sensor (10) is induced to be excited and its normally open node is actuated, and the 102FC proximity switch of the emergency pressure regulating valve input position sensor (11) is induced to be excited and its normally open node is actuated, that is, when the normally open nodes of the 101FC proximity switch and the 102FC proximity switch are actuated at the same time, it is determined that the emergency pressure regulating valve is in the actuated state.

8. The control method of the hydraulic control device of the emergency pressure distribution valve of the speed governor hydraulic system according to claim 1, characterized in that: When the hydraulic system pipeline needs to be drained for unit maintenance, the upper chamber (13) and the lower chamber (14) of the emergency pressure regulating valve are both in an oil-free state. However, since the valve core (5) and the valve core connecting rod (6) of the emergency pressure regulating valve move downward under the action of their own weight, the valve core connecting rod (6) is in an extended state, that is, the valve core (5) of the emergency pressure regulating valve is in action.

9. The control method of the hydraulic control device of the emergency pressure distribution valve of the speed governor hydraulic system according to claim 1, characterized in that: When the electromagnetic control valve (7) is actuated, the emergency pressure regulating valve is in action, which connects the main pressure regulating valve closing chamber and the servomotor closing chamber to the emergency oil source, connects the main pressure regulating valve opening chamber and the servomotor opening chamber to the return oil, and the emergency pressure regulating valve spool (5) and the spool connecting rod (6) move downward and are in an extended state, realizing the emergency closing function of the servomotor guide vane, thereby ensuring the safe and rapid shutdown of the unit.

10. The control method of the hydraulic control device of the emergency pressure distribution valve of the speed governor hydraulic system according to claim 1, characterized in that: When the electromagnetic control valve (7) is not actuated for excitation, the emergency pressure regulating valve is in a reset state, which will disconnect the main pressure regulating valve closing chamber and the servomotor closing chamber from the emergency oil source, disconnect the main pressure regulating valve opening chamber and the servomotor opening chamber from the return oil source, and the emergency pressure regulating valve spool (5) and the spool connecting rod (6) are in a retracted state, so that the servomotor guide vane is not closed, thereby ensuring the safe and stable operation of the unit.

11. The control method of the hydraulic control device of the emergency pressure distribution valve of the speed governor hydraulic system according to claim 1, characterized in that: The 101FC proximity switch of the emergency pressure regulating valve exit position sensor (10) and the 102FC proximity switch of the emergency pressure regulating valve input position sensor (11) both use the IFM series non-contact proximity switch, sensing distance: 7mm±10%, M12×1mm, working distance: 0~5.7mm, working voltage: 10~36VDC, current consumption: <10mA, output function: normally open, voltage drop: <2.5V, three-wire output, current load: 100mA, switching frequency: 800Hz, body length: 50mm, angle cable connector: EVC005 / 5m / φ4.9mm, IFM.

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