CN114738352B

CN114738352B - Hydraulic structure of speed regulator of small hydroelectric generating set, speed regulator and control method of speed regulator

Info

Publication number: CN114738352B
Application number: CN202210465675.8A
Authority: CN
Inventors: 陈小翠; 崔煜崑; 王启瑞; 冯陈; 杨春霞; 郑源
Original assignee: Hohai University HHU
Current assignee: Hohai University HHU
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2023-05-05
Anticipated expiration: 2042-04-29
Also published as: CN114738352A

Abstract

The invention provides a hydraulic structure of a speed regulator of a small hydroelectric generating set, the speed regulator and a control method thereof, which can ensure that the accident shutdown function is independent. The hydraulic structure comprises: an oil circuit, a valve and a servomotor; the valve part comprises a six-way reversing valve V5 and an accident shutdown valve V6; one end of the accident shutdown valve V6 is connected with the servomotor, the other end of the accident shutdown valve V6 is communicated with the hydraulic control end of the six-way reversing valve, and the accident shutdown valve V6 is also connected with an external protection device and is used for controlling the six-way reversing valve to reverse to the right position when an accident occurs to the unit; the ports C3 and C4 of the six-way reversing valve V5 are respectively communicated with a pressure oil port and an oil return port of the servomotor; the C5 and C6 ports of the six-way reversing valve V5 are respectively communicated with a closed cavity and an open cavity of the servomotor; when the six-way reversing valve V5 is positioned at the left position, the C1 and C2 ports of the six-way reversing valve V5 are communicated with the C5 and C6 ports; when the six-way reversing valve V5 is positioned at the right position, the C3 and C4 ports of the six-way reversing valve V5 are communicated with the C5 and C6 ports, the closed cavity of the servomotor is communicated with pressure oil, and the open cavity of the servomotor is communicated with oil return, so that the servomotor is closed rapidly.

Description

Hydraulic structure of speed regulator of small hydroelectric generating set, speed regulator and control method of speed regulator

Technical Field

The invention belongs to the technical field of hydroelectric generating set design, and particularly relates to a speed regulator of a small hydroelectric generating set.

Background

The core control equipment of the hydroelectric generating set is a speed regulator, and the core hydraulic control and execution device of the speed regulator is a main distributing valve. The action principle of the main distributing valve is based on the design of the hydraulic principle, the oil circuit integration and the electromagnetic valve integration. The main distributing valve body of the speed regulator of the large and medium-sized hydropower station generally adopts a first-stage or second-stage amplified slide valve or cartridge valve to carry out hydraulic discovery and realize the switching operation of the servomotor. The valve core is controlled to act by a hydraulic pilot control part, and the hydraulic pilot control part consists of a series of hydraulic circuits and electromagnetic valves with functions of manual operation, automatic operation, emergency stop and the like. For small power stations, the volume of the servomotor is small, so that the servomotor can be controlled directly by a valve-controlled main configuration, namely, the servomotor can be controlled directly by the electromagnetic valve without hydraulic amplification and only by the electromagnetic valve with 6 or 10 paths and the self flow of the servo proportional valve V1.

The actuating mechanism of the speed regulator is mainly composed of a main distributing valve and a servomotor, wherein the main distributing valve controls the servomotor, and the servomotor controls the water flow of the water turbine so as to control the water turbine unit. The main distribution and relay are hydraulic components, and the control structure of the main distribution and relay mainly has the following two forms according to the different sizes of the capacities of the units. Fig. 1 is a general composition form in China, an electrical control signal is applied to a servo proportional valve V1, and the servo proportional valve V1 pushes a main valve core to act, so that the main valve completes the operation of the servomotor. The main and auxiliary valve can be divided into slide valve type and cartridge valve type, and can be used for amplifying hydraulic pressure (flow and operation work).

Fig. 2 is a typical governor hydraulic system of a small unit configuration with a single unit capacity below 20MW, in which the main distributing valve is omitted, or hydraulic amplification is omitted, the servo proportional valve V1, solenoid valve can be regarded as the main distributing system of this type, this scheme is called "valve-controlled main distributing".

The electromagnetic valve is usually a two-position four-way valve, mainly realizes the functions of switching and emergency stop, and the servo proportional valve V1 and the manual valve are three-position four-way valves, mainly realizes the functions of increasing, decreasing and recovering.

At present, the hydraulic control part of the domestic speed regulator has various types, different speed regulator equipment manufacturers are different, and the hydraulic parts are different due to different requirements of the same equipment manufacturer.

In the prior art, the hydraulic structure is difficult to ensure that the accident shutdown functions are independent, and the reliable action of the emergency shutdown valve is also difficult to ensure.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a hydraulic structure of a speed regulator of a small hydroelectric generating set, the speed regulator and a control method thereof, which can ensure that the accident shutdown function is independent.

In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:

the invention provides a hydraulic structure of a speed regulator of a small hydroelectric generating set, which comprises the following components: an oil circuit, a valve and a servomotor;

The valve is communicated with the pressure oil port and the oil return port of the servomotor through oil ways;

the valve part comprises a six-way reversing valve V5 and an accident shutdown valve V6;

the six-way reversing valve V5 is provided with hydraulic control ends, C1, C2, C3, C4, C5 and C6 oil ports;

the hydraulic control end of the six-way reversing valve V5 is communicated with a pressure oil port and an oil return port of the servomotor through an accident shutdown valve V6; one end of the accident shutdown valve V6 is connected with the servomotor, the other end of the accident shutdown valve V6 is communicated with the hydraulic control end of the six-way reversing valve, and the accident shutdown valve V6 is also connected with an external protection device and is used for controlling the six-way reversing valve to reverse to the right position when a unit accident occurs;

the ports C3 and C4 of the six-way reversing valve V5 are respectively communicated with a pressure oil port and an oil return port of the servomotor;

the C5 and C6 ports of the six-way reversing valve V5 are respectively communicated with a closed cavity and an open cavity of the servomotor;

when the six-way reversing valve V5 is positioned at the left position, the C1 and C2 ports of the six-way reversing valve V5 are communicated with the C5 and C6 ports; when the six-way reversing valve V5 is positioned at the right position, the C3 and C4 ports of the six-way reversing valve V5 are communicated with the C5 and C6 ports, the servomotor is closed and communicated with pressure oil, and the servomotor is opened and communicated with oil return, so that the servomotor is closed rapidly.

Further, the hydraulic structure further comprises a servo proportional valve V1, a manual valve V2, an emergency stop valve V3, a first one-way valve V4-1 and a second one-way valve V4-2;

The ports C1 and C2 of the six-way reversing valve are respectively communicated with a servo proportional valve V1, a manual valve V2, an emergency stop valve V3, a first one-way valve V4-1 and a second one-way valve V4-2 through oil ways to realize pilot control;

the manual valve V2 is a three-position four-way valve controlled by double coils and is used for realizing the manual adjustment of the reversing of a valve core of the valve, thereby realizing the reversing of an oil way and completing the switching operation of a power device;

the emergency stop valve V3 is a single-coil-controlled two-position four-way valve and is used for realizing emergency stop of the servomotor;

the accident shutdown valve V6 is a two-position four-way valve controlled by a bidirectional coil.

Further, the outlet end of the first one-way valve V4-1 is connected with the C1 port of the six-way reversing valve, and the inlet end of the first one-way valve V4-1 is communicated with the A port of the emergency stop valve V3;

the inlet end of the second one-way valve V4-2 is connected with the C2 port of the six-way reversing valve, and the inlet end of the second one-way valve V4-2 is communicated with the B port of the emergency stop valve V3.

The port A of the servo proportional valve V1 is communicated with the port C1 of the six-way reversing valve, the port B is connected with the port C2 of the six-way reversing valve, the port T is communicated with the oil return port of the servomotor, and the port P is communicated with the port P of the emergency stop valve V3;

the A port of the manual valve V2 is communicated with the C1 port of the six-way reversing valve, the B port of the manual valve V2 is communicated with the C2 port of the six-way reversing valve, the P port of the manual valve V2 is communicated with the B port of the emergency stop valve V3, and the T port of the manual valve V2 is communicated with the oil return port of the relay.

The port A of the emergency stop valve is communicated with the port C1 of the six-way reversing valve, the port B is respectively communicated with the port P of the second one-way valve V4-2, the servo proportional valve V1 and the port P of the manual valve V2, the port P is communicated with the pressure oil port of the servomotor, and the port T is communicated with the oil return port of the servomotor;

a hydraulic lock V8 is arranged between the manual valve and the six-way reversing valve; a hydraulic lock V7 is arranged between the servo proportional valve V1 and the six-way reversing valve; when two pipelines at the lower end of the hydraulic lock are connected with the oil return port, the hydraulic lock is used for stopping an oil way so as to keep the current position of the servomotor and prevent the oil from flowing back. When the pressure of the operating cavity pipeline at the lower end of the hydraulic lock changes, the hydraulic lock is opened, and the switching cavity pipeline is all conducted, so that the switching action of the servomotor is realized.

Further, when the governor is in an automatic control state:

when the system is powered on and works normally, the emergency stop pilot valve V3 is powered off, the working position of the emergency stop pilot valve V3 is in a parallel position under the action of spring force, and at the moment, the port A is communicated with oil return, and the port B is communicated with pressure oil. At this time, the lower end of the first check valve V4-1 is oil return, and the upper end is at a cut-off position no matter pressure oil or oil return.

When no control signal is added or subtracted, the servo proportional valve V1 is positioned at the middle position, namely Y position, the P port of the proportional valve is normally communicated with pressure oil, the T port is communicated with oil return, the A, B oil ports of the servo proportional valve V1 are communicated with oil return, V7 is a hydraulic lock, and the servo proportional valve V1 is positioned at the cut-off position, namely the C1 and C2 oil ports of the six-way reversing valve are all sealed by the hydraulic lock;

In the automatic control state, the accident shutdown pilot valve V6 is in a reset position, namely a crossing position, so that the right side hydraulic control end of the six-way reversing valve V5 is connected with the oil return port, and the left side hydraulic control end is connected with the pressure oil port. Under the action of oil pressure, the first one-way valve V4-1 is at the left reset position, at the moment, the C1 port and the C5 port of the six-way reversing valve V5 are communicated, the C2 port and the C6 port are communicated, at the moment, the pressure difference of the switch cavities of the relay is consistent, and the current position is kept.

If the servo proportional valve V1 receives a reduced electrical signal, the servo proportional valve V1 is in a parallel position, the port A of the servo proportional valve V1 is communicated with the port P, and the port B is communicated with the port T; at the moment, the hydraulic lock is opened under the action of pressure, the closing cavity of the servomotor is communicated with oil pressure, the opening cavity is communicated with oil return, and the servomotor acts towards the reducing direction. If the servo proportional valve V1 receives an increased electrical signal, the servo proportional valve V1 is in a crossed position, an A port and a T port of the servo proportional valve V1 are communicated, a B port and a P port are communicated, the hydraulic lock V7 is opened, at the moment, the opening cavity of the servomotor is communicated with oil pressure, the closing cavity is communicated with oil return, and the servomotor acts in a super-increasing direction. The servo proportional valve V1 completes the switch control of the servomotor under the control of an electrical signal.

Under the automatic condition, the manual valve V2 is positioned at the middle position Y, oil return ports are respectively communicated with A, B ports, the hydraulic lock V8 is closed, and oil of the servo proportional valve V1 or oil of the servomotor cannot flow back from the manual valve V2.

Further, when the speed regulator is in a manual state, the servo proportional valve V1 is in a middle position, oil is fed back to the A, B ports, and the hydraulic lock V7 is cut off.

When the manual operation increases or decreases, the valve core of the manual valve V2 moves left and right to control the manual valve V2 to increase or decrease the coil to be electrified, so that the switching operation of the power butting device is formed.

Further, when the speed regulator is in an emergency stop state, the coil of the emergency stop pilot valve V3 is electrified, and the working position of the coil is in a parallel position, namely, the port A of the emergency stop pilot valve V3 is communicated with the port P, and the port B is communicated with the oil return port. At the moment, the first one-way valve V4-1 is pushed away by the pressure from the port A of the scram pilot valve V3, and the pressure port is communicated with the closed cavity of the servomotor through the ports C1 and C5 of the six-way reversing valve V5; the oil liquid with the open cavity passes through the C6 and C2 ports of the six-way reversing valve V5, pushes the second one-way valve V4-2 open, and is communicated with the oil return port to form a servomotor to be closed, so that emergency stop is realized.

In a second aspect, the invention provides a governor comprising the hydraulic arrangement of the first aspect.

In a third aspect, the invention provides a control method for a speed regulator of a small hydroelectric generating set, which is based on the speed regulator in the second aspect, and comprises the following steps:

when the accident happens, the six-way reversing valve is controlled to be reversed to the right position, so that the C3 and C4 ports of the six-way reversing valve V5 are communicated with the C5 and C6 ports, the servomotor closing cavity is communicated with pressure oil, and the servomotor opening cavity is communicated with oil return, so that the servomotor is closed quickly.

Further, the method further comprises:

when the system is powered on and works normally, the emergency stop pilot valve V3 is controlled to lose power, the working position of the emergency stop pilot valve V3 is in a parallel position under the action of spring force, at the moment, the port A is communicated with oil return, and the port B is communicated with pressure oil. At this time, the lower end of the first check valve V4-1 is oil return, and the upper end is at a cut-off position no matter pressure oil or oil return.

If the servo proportional valve V1 is in the middle position, namely Y position, the P port of the proportional valve is normally communicated with pressure oil, the T port is communicated with oil return, the A, B ports of the servo proportional valve V1 are communicated with oil return, V7 is a hydraulic lock, and the servo proportional valve V1 is in the cut-off position, namely the C1 port and the C2 port of the six-way reversing valve are all blocked by the hydraulic lock;

under the automatic control state, the accident shutdown pilot valve V6 is in a reset position, namely a crossing position, so that the right side hydraulic control end of the six-way reversing valve V5 is connected with the oil through return port, and the left side hydraulic control end is connected with the pressure oil port. Under the action of oil pressure, the first one-way valve V4-1 is at the left reset position, at the moment, the C1 port and the C5 port of the six-way reversing valve V5 are communicated, the C2 port and the C6 port are communicated, at the moment, the pressure difference of the switch cavities of the relay is consistent, and the current position is kept.

In the automatic case, the manual valve V2 is positioned at the middle position Y, the oil return ports are all communicated with the A, B ports, the hydraulic lock V8 is closed, and the oil of the servo proportional valve V1 or the oil of the servomotor cannot flow back from the manual valve V2.

Further, the method further comprises:

when the speed regulator is in a manual state, the servo proportional valve V1 is in the middle position, oil is fed back to the A, B ports, and the hydraulic lock V7 is cut off.

When the manual operation is increased or decreased, the valve core of the manual valve V2 is moved left and right so as to control the manual valve V2 to increase or decrease the coil to be electrified, and the switch operation of the power butting device is formed.

When the speed regulator is in an emergency stop state, the coil of the emergency stop pilot valve V3 is electrified, and the working position of the coil is in a parallel position, namely, the port A of the emergency stop pilot valve V3 is communicated with the port P, and the port B is communicated with the oil return port. At the moment, the first one-way valve V4-1 is pushed away by the pressure from the port A of the scram pilot valve V3, and the pressure port is communicated with the closed cavity of the servomotor through the ports C1 and C5 of the six-way reversing valve V5; the oil liquid with the open cavity passes through the C6 and C2 ports of the six-way reversing valve V5, pushes the second one-way valve V4-2 open, and is communicated with oil return to form a servomotor to be closed, so that emergency stop is realized. At the moment, as the oil return is conducted by the oil port B of the emergency stop valve, oil pressure does not exist in the ports P and T of the servo proportional valve V1 and the manual valve V2, and the hydraulic locks V7 and V8 are cut-off positions, so that the action oil cannot be leaked in the servo proportional valve V1 or the manual valve link after the action of the emergency stop electromagnetic valve is ensured.

Compared with the prior art, the invention has the beneficial effects that:

1. in order to realize the independence of accident shutdown of the hydroelectric generating set, the function is realized through the combination of an accident shutdown valve and a hydraulic control two-position six-way valve.

2. The original emergency stop design concept is changed, the switching valve is cancelled, the hydraulic lock is added, and the emergency stop valve is designed in the front section of the servo proportional valve V1 and the manual valve, so that the reliability of emergency stop can be completely ensured, and the unreliability of emergency stop caused by blocking of the switching valve, the servo proportional valve V1 or the manual valve is eliminated.

3. By arranging the check valve or the hydraulic lock, the internal leakage of the system oil pressure and the drift of the servomotor are effectively reduced under the steady state of the speed regulator.

Drawings

FIG. 1 is a hydraulic execution structure diagram of a conventional large and medium-sized hydroelectric generating set speed regulator;

FIG. 2 is a hydraulic actuation block diagram of a small hydroelectric generating set governor;

FIG. 3 is a hydraulic schematic diagram of a conventional small-sized unit governor;

FIG. 4 is a hydraulic schematic diagram of a novel small unit speed governor;

FIG. 5 is a schematic diagram of the structure of a servo proportional valve V1;

FIG. 6 is a schematic diagram of an integrated block structure;

FIG. 7 is a schematic structural view of a hydraulic lock;

fig. 8 is a schematic view of a servomotor.

In the figure: v1, a servo proportional valve; v2, a manual valve; an emergency stop valve; v3, V4-1, a first one-way valve; v4-2, a second one-way valve; v5, six-way reversing valve; v6, an accident stop valve.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.

In the description of the present embodiment, it should be noted that, if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are presented, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, only for convenience of describing the present embodiment and simplifying the description, and does not indicate or imply that the indicated apparatus or element must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present embodiment.

Embodiment one:

the embodiment provides a small-size hydroelectric generating set speed regulator hydraulic structure, includes: oil circuit (integrated oil circuit and open pipe oil circuit), valve and servomotor;

oil circuit: the hydraulic integrated block is mainly divided into an open pipeline and a hidden pipeline which is integrated inside the hydraulic integrated block. The open pipe is a pressure steel pipe, and is connected into a closed oil system through joints, flanges and the like, so that a common loop is simple, and a pipeline is relatively long. The pipeline inside the integrated block is formed by punching holes in a metal block through lathe processing, so that a complex hydraulic principle can be realized, and the pipeline is generally complex, concentrated and short. The oil way is used for realizing the circulation of oil of a hydraulic system and realizing the logic control of a valve and the operation of a power butting device.

A valve member: the hydraulic control system is characterized in that various electromagnetic valves and servo proportional valves V1 in the hydraulic schematic diagram of FIG. 4 can realize pilot control functions of automatic, manual, emergency stop and accident stop through some logic relations.

A servomotor: the hydraulic finished product is also called an oil cylinder, two oil ports are formed in the hydraulic finished product, the opening and the closing of the servomotor can be realized through the alternating change of the pressure and the return oil of the two oil ports, the water inlet flow of the hydraulic turbine of the hydropower station can be driven by the switch of the servomotor, and finally the control of the rotating speed and the output of the unit is realized. As shown in fig. 8.

the valve member comprises a servo proportional valve V1, a manual valve V2, an emergency stop valve V3, a first one-way valve V4-1, a second one-way valve V4-2, a six-way reversing valve V5 and an accident stop valve V6.

Manual valve V2: the valve is a three-position four-way valve for realizing the manual increasing and decreasing pulse electromagnetic valve, and double-coil control, and the valve core can be automatically restored when no external operation exists. Through the manual operation outside handle, can make the left coil (increase end) and the right coil (reduce end) of this valve get electricity, realize the switching-over of the case of this valve to realize the switching-over of oil circuit, accomplish the switching-over operation to the power ware.

Emergency stop valve V3: the valve can realize emergency stop of the servomotor, is a two-position four-way valve, can be positioned at a position corresponding to a spring (a left crossing position) when no external operation exists, and can be positioned at a position corresponding to the coil (a right parallel position) after the coil is electrified (all the time).

The first check valve V4-1 is a check valve at the left side in the square frame, and the first check valve V4-2 is a check valve at the right side in the square frame. Depending on the installation direction, the action of V4-1 can only allow the direction of the oil path from bottom to top, and the action of V4-2 can only allow the direction of the oil path from top to bottom, as shown in fig. 4.

Accident shutdown valve V6: the valve can also realize the quick stop of the servomotor (generally, when the unit has an accident and V3 fails), the bidirectional coil is controlled, and the valve core is positioned by itself. That is, after one end of the solenoid valve coil is powered on, the valve core does not need to be kept for a long time, and the valve core acts to a corresponding function, and the valve core automatically keeps the current position due to an internal mechanical locking mechanism.

Hydraulic locks V7, V8: the hydraulic lock is formed by combining 2 hydraulic control valves. When the hydraulic lock is not operated outside, as shown in fig. 7, the hydraulic lock can cut off the oil path when two pipelines at the lower end of the hydraulic lock are connected with the oil return port, so that the current position of the servomotor can be maintained, and the oil channeling and the oil backflow of the servomotor can be prevented. When the pressure of the operation cavity pipeline (any cavity) at the lower end of the hydraulic lock changes, the hydraulic lock is opened, and the switching cavity pipeline is conducted, so that the switching action of the servomotor is realized. Typically mounted inside the manifold block.

A hydraulic lock V8 is arranged between the manual valve and the six-way reversing valve; and a hydraulic lock V7 is arranged between the servo proportional valve V1 and the six-way reversing valve.

One end of the first one-way valve V4-1 is connected with a C1 port of the six-way reversing valve, and the other end of the first one-way valve V4-1 is communicated with an A port of the emergency stop valve V3;

one end of the second one-way valve V4-2 is connected with a C2 port of the six-way reversing valve, and the other end of the second one-way valve V4-2 is communicated with a B port of the emergency stop valve V3.

The port A of the emergency stop valve is communicated with the port C1 of the six-way reversing valve, the port B is respectively communicated with the port P of the second one-way valve V4-2, the port P of the servo proportional valve V1 and the port P of the manual valve V2, the port P is communicated with the pressure oil port of the servomotor, and the port T is communicated with the oil return port of the servomotor.

When the speed regulator is in an automatic control state:

When the speed regulator is in a manual state, the servo proportional valve V1 is in the middle position, oil is returned from the A, B ports, and the hydraulic lock V7 is cut off.

When the speed regulator is in an emergency stop state, the coil of the emergency stop pilot valve V3 is electrified, and the working position of the coil is in a parallel position, namely, the port A of the emergency stop pilot valve V3 is communicated with the port P, and the port B is communicated with the oil return port. At the moment, the first one-way valve V4-1 is pushed away by the pressure from the port A of the scram pilot valve V3, and the pressure port is communicated with the closed cavity of the servomotor through the ports C1 and C5 of the six-way reversing valve V5; the oil liquid with the open cavity passes through the C6 and C2 ports of the six-way reversing valve V5, pushes the second one-way valve V4-2 open, and is communicated with oil return to form a servomotor to be closed, so that emergency stop is realized.

At the moment, as the oil return is conducted by the oil port B of the emergency stop valve, oil pressure does not exist in the ports P and T of the servo proportional valve V1 and the manual valve V2, and the hydraulic locks V7 and V8 are cut-off positions, so that the action oil cannot be leaked in the servo proportional valve V1 or the manual valve link after the action of the emergency stop electromagnetic valve is ensured.

The hydraulic structure of the speed regulator of the small hydroelectric generating set can ensure that the accident shutdown function is independent, ensure the reliable action of an emergency shutdown valve and reduce the internal leakage of oil pressure.

As shown in fig. 4, a novel hydraulic schematic diagram is provided for the present invention. The broken line is a hydraulic integrated block, and the integrated block is composed of various electromagnetic valves and oil ways.

The invention provides a novel hydraulic principle of a speed regulator, which has the functions of conventional automatic control, manual operation, emergency stop and accident stop, ensures that the system has the independent accident stop function, enhances the reliability of the emergency stop, and can also prevent oil channeling and oil leakage. The scheme comprises a servo proportional valve V1, a manual valve V2, an emergency stop valve V3, second one-way valves V4-2 and V4-1 and an accident stop valve V6.

And the automatic control is carried out, when the system is powered on and normally works, the emergency stop valve V3 is powered off, the working position (function) of the emergency stop valve is in a parallel position under the action of spring force, at the moment, the port A is communicated with the oil return port, and the port B is communicated with the pressure oil port. At this time, the lower end of the first check valve V4-1 is an oil return port, and the upper end is at a cut-off position no matter the pressure oil port or the oil return port. When no control signal is increased or decreased, the servo proportional valve V1 is positioned at the middle position, namely Y position, the P port of the servo proportional valve V1 is normally connected with the pressure oil port, the T port is connected with the oil return port, the A, B oil ports of the servo proportional valve V1 are all connected with the oil return port, V7 is a hydraulic lock, and the C1 and C2 oil ports of the six-way reversing valve are all sealed by the hydraulic lock.

In the automatic control state, the accident shutdown pilot valve V6 is in a reset position, namely a crossing position, so that the right side hydraulic control end of the six-way reversing valve V5 is connected with the oil return port, and the left side hydraulic control end is connected with the pressure oil port. Under the action of oil pressure, V5 is at the left reset position, at the moment, C1 and C5 are identical, and C2 and C6 are communicated, so that both C5 and C6 are cut off, at the moment, the pressure difference of a switch cavity of the servomotor is consistent, and the current position is kept. At this time, if the servo proportional valve V1 receives a reduced electrical signal, the servo proportional valve V1 will be in a parallel position, at this time, the hydraulic lock V7 is composed of 2 hydraulically controlled check valves, at this time, the hydraulic lock is opened under the action of pressure, the closing chamber of the servomotor is connected with oil pressure, the opening chamber is connected with the oil return port, and the servomotor will act in a super-reducing direction. At this time, if the servo proportional valve V1 receives an increased electrical signal, the servo proportional valve V1 will be in a crossing position, at this time, the hydraulic lock V7 is opened by the connection of the a and T, the connection of the B and P, at this time, the opening of the servomotor is connected with the oil pressure, the closing of the chamber is connected with the oil return port, and the servomotor will act in a super-increasing direction. Thus, the servo proportional valve V1 completes the switch control of the servomotor under the control of the electric signal. Under the automatic condition, the manual valve V2 is positioned at the middle position Y, the oil return port is communicated with the AB port, and the hydraulic lock V8 is cut off, so that the oil of the servo proportional valve V1 or the oil of the servomotor cannot flow back from the manual valve.

And (3) manual control is performed, when the speed regulator is switched to manual operation, the servo proportional valve V1 is positioned at the middle position, the AB ports are all communicated with the oil return ports, and the hydraulic lock V7 is cut off. At the moment, the manual operation is increased or reduced, the valve core of the manual valve V2 moves left and right, the principle is similar to that of automatic operation, and the manual valve V2 can be manually controlled to increase or reduce the coil to be electrified, so that the switching operation of the power connector is formed.

And (3) emergency stop, wherein the emergency stop pilot valve V3 coil is electrified, and the working position of the emergency stop pilot valve V3 coil is in a parallel position, namely, the port A is communicated with the port P, and the port B is communicated with the oil return port. At the moment, the first one-way valve V4-1 is pushed away by pressure from the oil port A, the pressure oil port is connected with a closed cavity of the servomotor through C1 and C5, and oil in the opened cavity passes through C6 and C2 to push away the second one-way valve V4-2, is connected with an oil return port, so that the servomotor is closed, and emergency stop is realized. At this time, the oil return port is communicated with the oil return port through the oil port B of the emergency stop valve, the oil pressure is not available to the ports P and T of the servo proportional valve V1 and the manual valve V2, no matter where the 2 valves are (the positions are not fixed when the valve is blocked due to the fact that the valve is normally Y), the hydraulic locks V7 and V8 are all cut-off positions, and therefore the situation that after the emergency stop electromagnetic valve acts, the action oil cannot be leaked in the servo proportional valve V1 or the manual valve link can be completely ensured.

When the unit is in accident and needs to be stopped quickly and reliably, the accident stop valve V6 receives signals from an external protection device, the coil input end is electrified, and the working function of the V6 is in a parallel position. At this time, the right side hydraulic control end of the six-way reversing valve V5 is connected with the pressure oil port, the left side hydraulic control end is connected with the oil return port, the six-way reversing valve V5 works at the right end function, namely C5 is connected with C3, C6 is connected with C4, and because C3 is an ordinary pressure oil port and C4 is an oil return port, the hydraulic control valve leads to the closing cavity of the servomotor to be connected with the pressure oil port, and the opening cavity of the servomotor is connected with the oil return port, so that the servomotor is closed rapidly. Because the six-way reversing valve is used for reversing, the C1 and the C2 are in the stop positions, and the hydraulic connection of the servo proportional valve V1, the manual valve and the emergency stop valve is substantially isolated. It follows that an accident shutdown can achieve a hydraulically independent rapid shutdown.

After automatic or manual adjustment into position, the servo proportional valve V1 or the manual valve is in an intermediate position. At the moment, the hydraulic lock and the one-way valve of the hydraulic system are both in the cut-off positions, so that the problems of oil channeling and drifting of the servomotor and oil leakage of the system can be effectively prevented.

In contrast, fig. 3 shows the hydraulic principle of the valve-controlled speed regulator studied in the prior art, in which the oil paths are connected in parallel, and switching valves are arranged between the oil paths for switching and isolation, so as to maintain the independence of each path of operation and prevent the oil paths from channeling oil. As shown in fig. 3, although the solenoid valve is in the off position, it is impossible to completely shut off the oil, and particularly, the internal leakage of the solenoid valve is more remarkable when the oil pressure is higher than 10 MPa. Such as the scram valve of fig. 3, is in the shut-off position, although it is automatic or manual, and still causes an oil pressure leak. Therefore, a certain check valve needs to be added on the hydraulic circuit to reduce internal leakage.

The implementation method of the automatic control function in fig. 3: the servo proportional valve V1 realizes automatic control; when the system needs automatic control, the switching valve V4 is powered off, the electromagnetic valve is positioned at a parallel position, and the smooth oil path from the servo proportional valve V1 to the servomotor is ensured; solenoid valve V5 is de-energized and the solenoid valve is able to be in a closed position, thus ensuring that the manual circuit is closed. The electromagnetic valve V3 is an emergency stop valve, is in a resetting device state, can be in a cut-off position and cuts off an oil way. At this time, the servo proportional valve V1 moves the valve core left and right under the action of the control signal, and the switching operation of the power tool can be completed.

The manual operation function implementation method comprises the following steps: a manual valve V2 for realizing manual operation; when the system needs manual operation, the switching valve V4 is electrified, the electromagnetic valve is positioned at the cut-off position, and the cut-off of the oil path from the servo proportional valve V1 to the servomotor is ensured; the switching valve V5 is energized and the solenoid valve can be in a parallel position, thus ensuring a clear manual circuit. The electromagnetic valve V3 is an emergency stop valve, is in a resetting device state, can be in a cut-off position and cuts off an oil way. At this time, the solenoid valve coil of the manual valve moves left and right under the action of the manual increasing and decreasing signals, so that the switching operation of the power tool can be completed.

The emergency stop function implementation method comprises the following steps: the valve V3 is tightly stopped, so that emergency stop operation is realized; when the system is operated in need of emergency stop, the switching valve V4 is electrified, the electromagnetic valve is in a cut-off position, and the cut-off of an oil path from the servo proportional valve V1 to the servomotor is ensured; the switching valve V5 is de-energized and the solenoid valve can be in the off position, thus ensuring that the manual circuit is turned off. The electromagnetic valve V3 coil acts, the function is in a parallel position, at the moment, the relay chamber is communicated with the pressure oil port, and the relay chamber is communicated with the oil return port, so that the emergency closing of the relay is realized.

The emergency stop valve V3 is a double-coil positioning valve, and the position is kept independent of electromagnetic action.

The logical relationship can be represented by the following table.

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Most of domestic hydropower stations are very important for safe operation of units, and particularly, when the units are in accident, the speed regulator needs to respond quickly, so that the guide vanes are absolutely ensured to be closed and stopped. Thus, the expansion of accidents can be avoided. For this reason, the governor is required to have an independent accident shutdown function, but the governor in the prior art often does not have this function.

Secondly, the emergency stop function is ensured to be reliable, the main emergency stop valve is required to be reliable in action, or the emergency stop valve is required to be matched with other circuits appropriately, and the emergency stop function can be realized even if the other circuits are blocked by the switching valve. As shown in fig. 3, when the emergency stop valve is operated, if the switching valve V4 is not obtained, the function is still in the parallel position, or the switching valve V5 is blocked in the parallel position, after the emergency V3 is operated, the pressure oil port of the emergency stop valve returns to the oil return port from the switching valve V4 or V5, and thus, after the oil pressure loss is caused, the emergency stop function fails to push the servomotor to be closed.

Although the solenoid valve is in the off position, it is impossible to completely shut off the oil, and particularly when the oil pressure is higher than 10MPa, the internal leakage of the solenoid valve will be more remarkable. Such as the scram valve of fig. 3, is in the shut-off position, although it is automatic or manual, and still causes an oil pressure leak. It is difficult to ensure that the accident shutdown function is independent and that the emergency shutdown valve is reliably operated.

Note that the hydraulic configuration shown in fig. 3 is merely a comparison of prior studies and is not necessarily prior art.

Noun interpretation of related art terms:

hydraulic control check valve: the hydraulic control check valve is a valve which can reversely circulate the check valve by controlling the fluid pressure. The hydraulic lock in fig. 4 is a combination of 2 pilot operated check valves.

Servo proportional valve V1: the proportional control valve is a control valve for continuously and proportionally controlling the flow, pressure and direction of a hydraulic system according to an input electric signal. The functional block diagram of the servo proportional valve V1 is shown in FIG. 5.

Embodiment two:

the present embodiment provides a speed governor including the hydraulic structure of the first embodiment. The governor of this embodiment can perform the function of the hydraulic structure of embodiment one.

Embodiment III:

the embodiment provides a control method of a speed regulator, which is based on the speed regulator in the second embodiment, and comprises automatic control, manual control, emergency stop and accident stop, wherein the methods are as follows:

The automatic control method comprises the following steps: when the system is powered on and works normally, the emergency stop valve V3 is powered off, the working position (function) of the emergency stop valve is in a parallel position under the action of spring force, and at the moment, the port A is communicated with oil return, and the port B is communicated with pressure oil. At this time, the lower end of the first check valve V4-1 is oil return, and the upper end is at a cut-off position no matter pressure oil or oil return. When no control signal is added or reduced, the proportional valve V1 is in the middle position, namely Y position, the P port of the proportional valve is normally communicated with pressure oil, the T port is communicated with oil return, the A, B ports of the proportional valve are communicated with oil return, V7 is a hydraulic lock, and the proportional valve V1 is in the cut-off position, namely the C1 port and the C2 port of the six-way reversing valve are all sealed by the hydraulic lock. In the automatic control state, the accident shutdown pilot valve V6 is in a reset position, namely a crossing position, so that the right side hydraulic control end of the six-way reversing valve V5 is connected with oil return, and the left side hydraulic control end is connected with pressure oil. Under the action of oil pressure, V5 is at the left reset position, at the moment, C1 and C5 are identical, and C2 and C6 are communicated, so that both C5 and C6 are cut off, at the moment, the pressure difference of a switch cavity of the servomotor is consistent, and the current position is kept. At this time, if the proportional valve receives a reduced electrical signal, the proportional valve will be in a parallel position, at this time, the A and P are communicated, the B and T are communicated, the hydraulic lock V7 is composed of 2 hydraulic control one-way valves, at this time, the hydraulic lock is opened under the action of pressure, the closing cavity of the servomotor is connected with oil pressure, the opening cavity is connected with oil return, and the servomotor will act in a super-reduction direction. At this time, if the proportional valve receives an increased electrical signal, the proportional valve will be in a crossed position, at this time, the A and T are communicated, the B and P are communicated, the hydraulic lock V7 is opened, at this time, the opening cavity of the servomotor is communicated with the oil pressure, the closing cavity is communicated with the oil return, and the servomotor will act in a super-increasing direction. Thus, the proportional valve completes the switch control of the servomotor under the control of the electric signal. Under the automatic condition, the manual valve V2 is positioned at the middle position Y, oil is fed back to the AB port, and the hydraulic lock V8 is cut off, so that oil of the proportional valve or oil of the relay can not flow back from the manual valve.

The manual control method comprises the following steps: however, when the speed regulator is manually cut, the proportional valve V1 is in the middle position, the oil is returned from the AB port, and the hydraulic lock V7 is cut off. At the moment, the manual operation is increased or reduced, the valve core of the manual valve V2 moves left and right, the principle is similar to that of automatic operation, and the manual valve V2 can be manually controlled to increase or reduce the coil to be electrified, so that the switching operation of the power connector is formed.

An emergency shutdown method comprises the following steps: the emergency stop pilot valve V3 coil is powered on, and the working position of the emergency stop pilot valve V3 coil is in a parallel position, namely, the port A is communicated with the port P, and the port B is communicated with the oil return. At the moment, the first one-way valve V4-1 is pushed away by the pressure from the oil port A, the pressure oil is connected with the closed cavity of the servomotor through C1 and C5, and the oil in the opened cavity is pushed away by C6 and C2 to push the one-way valve V4, so that the servomotor is connected with oil return, and the servomotor is closed, so that emergency stop is realized. At this time, the oil port B of the emergency stop valve is communicated with oil return, the ports P and T of the proportional valve V1 and the manual valve V2 are not oil-pressed, no matter where the 2 valves are (the positions are not fixed when the valve is blocked when the valve is normally Y), the hydraulic locks V7 and V8 are cut-off positions, and thus, after the emergency stop electromagnetic valve acts, the action oil can not be leaked in the proportional valve or the manual valve link.

The accident shutdown method comprises the following steps: when the unit has an accident, the accident stop valve V6 receives a signal from an external protection device, the coil input end is electrified, and the working function of the V6 is in a parallel position. At this time, the right side hydraulic control end of the six-way reversing valve V5 is connected with pressure oil, the left side hydraulic control end is connected with oil return, the six-way reversing valve V5 works at the right end function, namely C5 is connected with C3, C6 is connected with C4, and C4 is oil return because C3 is normal pressure oil, so that the servomotor is closed to be connected with the pressure oil, and the servomotor is opened to be connected with the oil return, so that the servomotor is closed rapidly. Because the six-way reversing valve is used for reversing, the C1 and the C2 are in the stop position, and the hydraulic connection of the proportional valve, the manual valve and the emergency stop valve is substantially isolated. It follows that an accident shutdown can achieve a hydraulically independent rapid shutdown.

After automatic or manual adjustment into position, the proportional valve or manual valve is in an intermediate position. At the moment, the hydraulic lock and the one-way valve of the hydraulic system are both in the cut-off positions, so that the problems of oil channeling and drifting of the servomotor and oil leakage of the system can be effectively prevented.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature, and in the description of the invention, "a plurality" means two or more, unless otherwise specifically and clearly defined.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations may be made in the above embodiments by those skilled in the art without departing from the spirit and principles of the invention.

Claims

1. A hydraulic structure of a speed regulator of a small hydroelectric generating set, comprising: an oil circuit, a valve and a servomotor;

the valve member comprises a six-way reversing valve and an accident shutdown valve;

the six-way reversing valve is provided with a hydraulic control end, C1, C2, C3, C4, C5 and C6 oil ports;

the hydraulic control end of the six-way reversing valve is communicated with a pressure oil port and an oil return port of the servomotor through the accident shutdown valve; one end of the accident stop valve is connected with the pressure oil P, the other end of the accident stop valve is communicated with the hydraulic control end of the six-way reversing valve, and the accident stop valve is also connected with an external protection device and is used for controlling the six-way reversing valve to be reversed to the right position when an accident occurs to the unit;

the C3 and C4 ports of the six-way reversing valve are respectively communicated with a main control oil P port and an oil return port;

The C5 and C6 ports of the six-way reversing valve are respectively communicated with a closed cavity and an open cavity of the servomotor;

when the six-way reversing valve is positioned at the left position, the C1 and C2 ports of the six-way reversing valve are communicated with the C5 and C6 ports; when the six-way reversing valve is positioned at the right position, the C3 and C4 ports of the six-way reversing valve are communicated with the C5 and C6 ports, the closed cavity of the servomotor is communicated with pressure oil, and the open cavity of the servomotor is communicated with oil return, so that the servomotor is closed rapidly;

the hydraulic structure also comprises a servo proportional valve, a manual valve, an emergency stop valve, a first one-way valve and a second one-way valve;

the manual valve is a double-coil controlled three-position four-way valve and is used for realizing the manual adjustment of the reversing of the valve core of the valve, thereby realizing the reversing of an oil way and completing the switching operation of a power device;

the emergency stop valve is a single-coil-controlled two-position four-way valve and is used for realizing emergency stop of the servomotor;

the accident stop valve is a two-position four-way valve controlled by a bidirectional coil;

the outlet end of the first one-way valve is connected with the C1 port of the six-way reversing valve, and the inlet end of the first one-way valve is communicated with the A port of the emergency stop valve;

the inlet end of the second one-way valve is connected with the C2 port of the six-way reversing valve, and the outlet end of the second one-way valve is communicated with the B port of the emergency stop valve;

The A port of the servo proportional valve is communicated with the C1 port of the six-way reversing valve, the B port of the servo proportional valve is connected with the C2 port of the six-way reversing valve, the T port of the servo proportional valve is communicated with the oil return port, and the P port of the servo proportional valve is communicated with the A port or the B port of the emergency stop valve;

the port A of the manual valve is communicated with the port C1 of the six-way reversing valve, the port B of the manual valve is communicated with the port C2 of the six-way reversing valve, the port P of the manual valve is communicated with the port B of the emergency stop valve, and the port T of the manual valve is communicated with the oil return port;

the port A of the emergency stop valve is communicated with the port C1 of the six-way reversing valve, the port B is respectively communicated with the port P of the second one-way valve, the port P of the servo proportional valve and the port P of the manual valve, the port P is communicated with the pressure oil port of the servomotor, and the port T is communicated with the oil return port;

a hydraulic lock V8 is arranged between the manual valve and the six-way reversing valve; a hydraulic lock V7 is arranged between the servo proportional valve and the six-way reversing valve; when two pipelines at the lower end of the hydraulic lock are both communicated with the oil return port, the hydraulic lock is used for stopping an oil way so as to keep the current position of the servomotor and prevent the oil from flowing back by the servomotor; when the pressure of the operating cavity pipeline at the lower end of the hydraulic lock changes, the hydraulic lock is opened, and the switching cavity pipeline is all conducted, so that the switching action of the servomotor is realized.

2. The hydraulic structure of a miniature hydro-power generating unit speed regulator of claim 1, wherein when the speed regulator is in an automatic control state:

When the system is powered on and works normally, the emergency stop valve is powered off, the working position of the emergency stop valve is in a parallel position under the action of spring force, at the moment, the port A is communicated with oil return, and the port B is communicated with pressure oil; at the moment, the lower end of the first one-way valve is oil return, and the upper end is at a cut-off position no matter pressure oil or oil return;

when the servo proportional valve is in the middle position, namely Y position, the P port of the proportional valve is normally communicated with pressure oil, the T port is communicated with oil return, the A, B ports of the servo proportional valve are communicated with oil return, V7 is a hydraulic lock, and the servo proportional valve is in the cut-off position, namely the C1 port and the C2 port of the six-way reversing valve are all sealed by the hydraulic lock;

in the automatic control state, the accident stop valve is at a reset position, namely a left-side crossing position, so that the right-side hydraulic control end of the six-way reversing valve is connected with an oil return port, and the left-side hydraulic control end is connected with a pressure oil port; under the action of oil pressure, at the moment, the C1 port and the C5 port of the six-way reversing valve are communicated, and the C2 port and the C6 port are communicated; the emergency stop valve is in a power-off state, the oil paths of the first one-way valve and the second one-way valve are in a cut-off state, at the moment, the oil pressure of the switch cavity of the servomotor cannot flow, the pressure difference is consistent, and the current position is kept;

if the servo proportional valve receives a reduced electrical signal, the servo proportional valve is in a parallel position, an A port and a P port of the servo proportional valve are communicated, and a B port and a T port of the servo proportional valve are communicated; at the moment, the hydraulic lock is opened under the action of pressure, the closing cavity of the servomotor is communicated with oil pressure, the opening cavity is communicated with oil return, and the servomotor acts towards the reducing direction; if the servo proportional valve receives an increased electrical signal, the servo proportional valve is in a crossing position, an A port and a T port of the servo proportional valve are communicated, a B port and a P port of the servo proportional valve are communicated, a hydraulic lock V7 is opened, at the moment, the opening cavity of the servomotor is communicated with oil pressure, the closing cavity is communicated with oil return, and the servomotor acts in the increasing direction; the servo proportional valve completes the switch control of the servomotor under the control of an electrical signal;

Under the automatic condition, the manual valve is positioned at the middle position Y, the A, B ports are all communicated with the oil return port, the hydraulic lock V8 is cut off, and the oil of the servo proportional valve or the oil of the servomotor cannot flow back from the manual valve.

3. The hydraulic structure of the speed regulator of the small hydroelectric generating set according to claim 1, wherein when the speed regulator is in a manual state, the servo proportional valve is in a middle position, oil is returned from the A, B ports, and the hydraulic lock V7 is cut off;

when the manual operation increases or decreases, the valve core of the manual valve moves left and right to control the manual valve to increase or decrease the coil to be powered on, so that the switching operation of the power amplifier is formed.

4. The hydraulic structure of a speed regulator of a small hydroelectric generating set according to claim 1, wherein when the speed regulator is in an emergency stop state, the coil of the emergency stop valve is electrified, and the working position of the coil of the emergency stop valve is in a parallel position, namely, an A port and a P port of the emergency stop valve are communicated, and a B port and an oil return port are communicated; at the moment, the first one-way valve is pushed open by the pressure from the A port of the emergency stop valve, and the pressure oil port is communicated with the closed cavity of the servomotor through the C1 port and the C5 port of the six-way reversing valve; the oil in the open cavity passes through the C6 and C2 ports of the six-way reversing valve, pushes away the second one-way valve, is communicated with the oil return port, and forms a relay to be closed, thereby realizing emergency stop.

5. A governor comprising a hydraulic arrangement according to any of claims 1-4.

6. A method for controlling a speed regulator of a small hydroelectric generating set, characterized in that the speed regulator according to claim 5 comprises the following steps:

when the accident happens, the six-way reversing valve is controlled to be reversed to the right position, so that the C3 and C4 ports of the six-way reversing valve are communicated with the C5 and C6 ports, the relay chamber is communicated with pressure oil, the relay chamber is opened, and the oil return is communicated, so that the relay is quickly closed.

7. The governor control method of claim 6, further comprising:

when the system is powered on and works normally, the emergency stop valve is controlled to lose electricity, the working position of the emergency stop valve is in a parallel position under the action of spring force, at the moment, the port A is communicated with oil return, and the port B is communicated with pressure oil; at the moment, the lower end of the first one-way valve is oil return, and the upper end is at a cut-off position no matter pressure oil or oil return;

if the servo proportional valve is in the middle position, namely Y position, the P port of the proportional valve is normally communicated with pressure oil, the T port is communicated with oil return, the A, B ports of the servo proportional valve are communicated with oil return, V7 is a hydraulic lock, and the servo proportional valve is in the cut-off position, namely the C1 port and the C2 port of the six-way reversing valve are all sealed by the hydraulic lock;

Under the automatic control state, the accident stop valve is in a reset position, namely a crossing position, so that the right side hydraulic control end of the six-way reversing valve is connected with an oil return port, and the left side hydraulic control end of the six-way reversing valve is connected with a pressure oil port; under the action of oil pressure, the first one-way valve is at a left reset position, at the moment, the C1 port and the C5 port of the six-way reversing valve are communicated, the C2 port and the C6 port of the six-way reversing valve are communicated, at the moment, the pressure difference of a switch cavity of the servomotor is consistent, and the current position is kept;

if the servo proportional valve receives the reduced electrical signal, the servo proportional valve is in a parallel position, the A port and the P port of the servo proportional valve are communicated, and the B port and the T port of the servo proportional valve are communicated; at the moment, the hydraulic lock is opened under the action of pressure, the closing cavity of the servomotor is communicated with oil pressure, the opening cavity is communicated with oil return, and the servomotor acts towards the reducing direction; if the servo proportional valve receives an increased electrical signal, the servo proportional valve is in a crossing position, an A port and a T port of the servo proportional valve are communicated, a B port and a P port of the servo proportional valve are communicated, a hydraulic lock V7 is opened, at the moment, the opening cavity of the servomotor is communicated with oil pressure, the closing cavity is communicated with oil return, and the servomotor acts in the increasing direction; the servo proportional valve completes the switch control of the servomotor under the control of an electrical signal;

8. The governor control method of claim 6, further comprising:

when the speed regulator is in a manual state, the servo proportional valve is in a middle position, oil is returned from the A, B ports, and the hydraulic lock V7 is cut off;

when the manual operation is increased or decreased, the valve core of the manual valve is moved left and right so as to control the manual valve to increase or decrease the coil to be electrified, thus forming the switching operation of the power butting device;

when the speed regulator is in an emergency stop state, the coil of the emergency stop valve is electrified, and the working position of the coil is in a parallel position, namely, an opening A of the emergency stop valve is communicated with an opening P, and an opening B of the emergency stop valve is communicated with an oil return opening; at the moment, the first one-way valve is pushed open by the pressure from the A port of the emergency stop valve, and the pressure oil port is communicated with the closed cavity of the servomotor through the C1 port and the C5 port of the six-way reversing valve; the oil in the open cavity passes through the C6 and C2 ports of the six-way reversing valve, pushes away the second one-way valve, and is communicated with oil return to form a relay to be closed, so that emergency stop is realized; at the moment, as the oil return is conducted by the oil port B of the emergency stop valve, the oil pressure does not exist in the port P and the port T of the servo proportional valve and the port T of the manual valve, and the hydraulic locks V7 and V8 are cut-off positions, so that the action oil can not be leaked in the servo proportional valve or the manual valve link after the action of the emergency stop electromagnetic valve is ensured.