CN220706101U - Electrohydraulic control valve bank, servo control device and hydroelectric generating set adjusting system - Google Patents

Abstract

The utility model provides an electrohydraulic control valve group, a servo control device and a hydroelectric generating set regulating system, which comprises a main pressure distribution valve, wherein the main pressure distribution valve comprises a pressure distribution valve body, a pressure distribution valve core arranged in the pressure distribution valve body and connected with the pressure distribution valve body in a sliding manner, and further comprises a hydraulic control device, a motor control device and an isolation device, wherein the isolation device comprises a control valve body and a piston positioned in the control valve body, the hydraulic control device comprises a first oil way for driving the piston to move linearly, the motor control device comprises a transmission structure for driving the piston to move linearly, and the piston is fixedly connected with the pressure distribution valve core. The utility model can improve the reliability of the adjusting device and improve the power generation quality of the hydroelectric generating set.

Description

Electrohydraulic control valve bank, servo control device and hydroelectric generating set adjusting system

Technical Field

The utility model relates to the technical field of hydroelectric generation, in particular to an electrohydraulic control valve bank, a servo control device and a hydroelectric generating set adjusting system.

Background

Along with the gradual improvement of the engineering construction quality of domestic and foreign hydropower stations and the manufacturing level of electromechanical equipment, the construction of large-scale hydroelectric generating sets and even huge hydroelectric generating sets is gradually increased, the running stability and reliability of a main regulation control system of the large-scale hydroelectric generating sets are higher and higher, the normal on-off control and the active load adjustment of the sets are realized, and the special working conditions of primary frequency modulation, small-network running and the like of the sets are also met. Therefore, the electrohydraulic control valve set serving as a key adjusting device of the unit has higher technical requirements.

In the prior art, the main pressure distribution valve is controlled in proportion by a motor control device, but once the motor control device fails, the main pressure distribution valve is controlled to fail, so that the servomotor is caused to move abnormally, the hydroelectric generating set is caused to work abnormally, and the generating quality of the hydroelectric generating set is influenced.

Therefore, the existing electrohydraulic control valve group, servo control device and hydroelectric generating set adjusting system are required to be improved, so that the influence of the failure of the motor control device on the stability of the hydroelectric generating set adjusting system and the power generation quality of the hydroelectric generating set are avoided.

Disclosure of Invention

The utility model aims to provide an electrohydraulic control valve bank, a servo control device and a hydroelectric generating set adjusting system, so as to solve the problems that the existing electrohydraulic control valve bank, servo control device and hydroelectric generating set adjusting system are poor in reliability and poor in generating quality of a hydroelectric generating set.

In order to solve the technical problems, the utility model provides an electrohydraulic control valve group, which comprises a main distributing valve, a hydraulic control device, a motor control device and an isolating device, wherein the main distributing valve comprises a distributing valve body, a distributing valve core arranged in the distributing valve body and connected with the distributing valve body in a sliding way, the isolating device comprises a control valve body and a piston positioned in the control valve body, the hydraulic control device comprises a first oil way for driving the piston to move linearly, the motor control device comprises a transmission structure for driving the piston to move linearly, and the piston is fixedly connected with the distributing valve core.

Optionally, the piston and the control valve body form a pressure sensitive cavity for driving the piston to move, and the first oil circuit is communicated with the pressure sensitive cavity.

Optionally, the motor control device further comprises an oil return oil path, and the isolation device further comprises a second oil path communicated with the oil return oil path and the hydraulic oil source and an isolation valve capable of controlling the second oil path to feed oil or return oil to the pressure sensitive cavity when the motor control device works.

Optionally, the isolation valve is a two-position five-way valve, and comprises a C2 port and an F port, wherein the C2 port is movably communicated with the F port, the C2 port is communicated with the second oil way, and the F port is communicated with the pressure sensitive cavity.

Optionally, the isolating device is further provided with a b1 channel, a p1 channel and a t2 channel which are formed in the control valve body, and a p1-1 channel communicated with the p1 channel, a p1-2 channel communicated with the p1 channel and a b2 channel capable of being communicated with the b1 channel in the moving process are formed in the piston; the piston oil chamber is provided with a pressure oil valve disc which is movably used for blocking one end of the p1-1 channel and a control valve disc which is movably used for blocking one end of the b1 channel and can synchronously move with the pressure oil valve disc; a first oil cavity is formed between the control valve disc and the pressure oil valve disc, the first oil cavity is a part of an oil cavity of the piston, one end of the p1-2 channel is communicated with the first oil cavity, the p1 channel is communicated with a hydraulic oil source, one end of the t2 channel is communicated with an oil return oil path, the other end of the t2 channel is communicated with a second oil cavity, and the second oil cavity is an oil cavity area corresponding to one side of the control valve disc, which is away from the pressure oil valve disc.

Optionally, the hydraulic control device comprises a control valve arranged on the first oil path and capable of controlling the first oil path to feed oil or return oil to the pressure sensitive cavity when the hydraulic control device works.

Optionally, the transmission structure includes motor, ball, control case and first elasticity piece that resets, the motor sets up on the control valve body, the output of motor with ball's input is connected, ball's output with control case is connected, control case with piston swing joint, control case with the pressure distribution valve core is connected through first elasticity piece that resets.

Optionally, the main pressure distributing valve is a three-position four-way valve, the pressure distributing valve core comprises a pressure distributing main body, a pressure distributing upper valve disc and a pressure distributing lower valve disc which are sequentially arranged on the pressure distributing main body, the pressure distributing upper valve disc is closer to the control valve body than the pressure distributing lower valve disc,

the main distributing valve is provided with a KJ port, a GJ port, a PJ port and a T port, wherein the PJ port is communicated with a hydraulic oil source, the T port is communicated with an oil return oil path, the KJ port and the GJ port are communicated with an output oil path, and the area of the upper distributing valve disc is larger than that of the lower distributing valve disc.

The utility model also provides a servo control device which comprises a hydraulic oil source, a servomotor and the electrohydraulic control valve group, wherein the hydraulic oil source is communicated with the isolating device and the main distributing valve, and the main distributing valve is communicated with the servomotor.

The utility model also provides a hydroelectric generating set adjusting system which comprises the blade water guide mechanism and the servo control device, wherein the servomotor in the servo control device is connected with the blade water guide mechanism.

The electrohydraulic control valve group, the servo control device and the hydroelectric generating set adjusting system provided by the utility model have the following beneficial effects:

because the isolating device comprises a control valve body and a piston positioned in the control valve body, the hydraulic control device comprises a first oil way for driving the piston to linearly move, the motor control device comprises a transmission structure for driving the piston to linearly move, and the piston is fixedly connected with the pressure distribution valve core, so that the pressure distribution valve core of the main pressure distribution valve can be controlled by one of two control modes of the hydraulic control device and the motor control device, and the other control mode does not influence the operation of the control mode when one control mode is controlled, the redundant control of the main pressure distribution valve can be realized, thereby avoiding abnormal operation of the hydraulic generator set, the reliability of a water-turbine generator set adjusting system and the power generation quality of the hydraulic generator set due to the control failure of the main pressure distribution valve when the motor control device is damaged.

Drawings

FIG. 1 is a schematic diagram of an electro-hydraulic control valve block in an embodiment of the present utility model;

FIG. 2 is a schematic view of a portion of the structure of a separator device in an embodiment of the present utility model;

FIG. 3 is a schematic diagram of the structure of a main pressure distribution valve according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram of a motor control device according to an embodiment of the present utility model;

FIG. 5 is a block diagram of a isolation valve in one operating state in an embodiment of the utility model;

FIG. 6 is a block diagram of a isolation valve in another operating condition in an embodiment of the utility model;

FIG. 7 is a control schematic diagram of an electro-hydraulic control valve set in a reset state in an embodiment of the present utility model;

FIG. 8 is a control schematic diagram of a motor control device in an electrohydraulic control valve block controlling a main pressure valve with a pressure valve core in a reset state according to an embodiment of the present utility model;

FIG. 9 is a control schematic diagram of a motor control device in an electrohydraulic control valve block controlling a pressure valve core of a main pressure valve to move in a closing direction of a control servomotor in an embodiment of the present utility model;

fig. 10 is a control schematic diagram of a hydraulic control device in an electrohydraulic control valve block in an embodiment of the present utility model when a pressure valve core of a main pressure valve is controlled to move in a closing direction by a control servomotor.

Reference numerals illustrate:

100-a main distributing valve; 110-a pressure distributing valve body; 120-distributing valve cores; 140-upper valve disc is matched; 150-distributing the lower valve disc;

210-a first oil path; 220-an oil return way; 230-a pressure sensitive cavity; 240-control valve;

300-motor control means; 310-motor; 320-shaft coupling; 330-ball screw; 340-a transmission shaft; 350-supporting seat; 360-a second elastic restoring member; 370-adjustable handwheels;

411-control valve body; 412-a control spool; 414-a drain valve disc; 415-oil return valve disc; 416-pressure oil valve disc; 417-control valve disc; 418-a piston; 420-a first elastic restoring member; 430-a third oil path; 440-a second oil path; 450-isolation valve; 463-a first oil chamber; 464-a second oil chamber; 461-third oil chamber; 462-fourth oil chamber; 471-first bushing; 481-a limiting plate; 482-a limit pin; 483-a limiting pull rod; 484-limit nut; 491-a channel switching valve; 492-a third elastic restoring member; 493-a second liner;

500-servomotor; 510-a first relay oil chamber; 520-a second relay oil chamber; 530-relay pistons;

600-oil filter;

700-emergency shutdown valve.

Detailed Description

The electrohydraulic control valve set, the servo control device and the hydroelectric generating set adjusting system provided by the utility model are further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present utility model will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the utility model.

Referring to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5 and fig. 6, fig. 1 is a schematic diagram of an electrohydraulic control valve set in an embodiment of the present utility model, fig. 2 is a schematic diagram of a part of a pressure distributing valve set 120 slidably connected to the pressure distributing valve set 110 in an embodiment of the present utility model, fig. 3 is a schematic diagram of a main pressure distributing valve set 100 in an embodiment of the present utility model, fig. 4 is a schematic diagram of a motor control set 300 in an embodiment of the present utility model, fig. 5 is a schematic diagram of a isolating valve 450 in an operating state in an embodiment of the present utility model, fig. 6 is a schematic diagram of an isolating valve 450 in another operating state in an embodiment of the present utility model, an electrohydraulic control valve set is provided, comprising a pressure distributing valve set 110 and a pressure distributing valve set 120 slidably connected to the pressure distributing valve set 110 in the embodiment of the present utility model, and further comprising a hydraulic control device, a motor control set 300 and an isolating device comprising a control valve set 411 and a piston 418 located in the control set 411, the hydraulic control set comprising the first motor control set 418 and the piston 418 driving the piston 418 to move linearly, the piston 418, and the piston 418 is fixed to the piston set 418.

Because the isolating device comprises the control valve body 411 and the piston 418 positioned in the control valve body 411, the hydraulic control device comprises the first oil way 210 for driving the piston 418 to linearly move, the motor control device comprises the transmission structure for driving the piston 418 to linearly move, and the piston 418 is fixedly connected with the pressure distribution valve core 120, therefore, the pressure distribution valve core 120 of the main pressure distribution valve 100 can be controlled by one of two control modes of the hydraulic control device and the motor control device 300, and the other control mode does not influence the operation of the control mode when the control mode is controlled, thereby realizing the redundant control of the main pressure distribution valve 100, avoiding the control failure of the main pressure distribution valve 100 when the motor control device 300 is damaged, causing the abnormal movement of the relay 500, causing the abnormal operation of the hydraulic generator set adjusting system and affecting the power generation quality of the hydraulic generator set.

Referring to fig. 1, the piston 418 and the control valve body 411 form a pressure sensitive chamber 230 that drives the piston 418 to move, a first end of the first oil passage 210 communicates with a hydraulic oil source, and a second end of the first oil passage 210 communicates with the pressure sensitive chamber 230.

The electrohydraulic control valve group further comprises an oil return path 220, and the isolating device further comprises a second oil path 440 communicated with both the oil return path 220 and a hydraulic oil source, and an isolating valve 450 capable of controlling the second oil path 440 to feed oil or return oil to the pressure sensitive cavity 230 when the motor control device 300 works.

The electrohydraulic control valve group further comprises a third oil path 430, wherein a first end of the third oil path 430 is respectively communicated with the oil return path 220 and the hydraulic oil source.

The isolating valve is a two-position five-way valve and comprises a C2 port and an F port, wherein the C2 port is movably communicated with the F port, the C2 port is communicated with the second oil way, and the F port is communicated with the pressure sensitive cavity. The C2 port and the F port are communicated or separated under the movement of a valve core of the isolation valve, so that the movable communication of the C2 port and the F port is realized.

The isolation valve 450 further comprises an A2 port, a B2 port and an E port, when the isolation valve 450 is in a motor control position for enabling the motor control device 300 to control the pressure distribution valve core 120 of the main pressure distribution valve 100 to act (i.e. the transmission structure drives the piston to move), the A2 port, the B2 port and the E port are blocked, the C2 port is communicated with the F port, the C2 port is communicated with the second oil path 440, the F port is communicated with the pressure sensitive cavity 230 through an a1 port, when the isolation valve 450 is in a hydraulic control position for enabling the hydraulic control device to control the pressure distribution valve core 120 of the main pressure distribution valve 100 to act (i.e. the first oil path drives the piston to move), the A2 port is communicated with the F port, the C2 port and the F port are communicated with the pressure sensitive cavity 230 through the a1 port, the A2 port is communicated with the second end of the first oil path 210, and the B2 port is communicated with the second end 430 of the third oil path.

Specifically, when the isolation valve 450 is in the motor control position, the port A2, the port B2 and the port E are blocked, the port C2 is communicated with the port F, the port C2 is communicated with the second oil path 440, and the port F is communicated with the pressure sensitive chamber 230 through the port a 1; when the pressure sensitive chamber 230 discharges oil, hydraulic oil enters the second oil passage 440 from a1→f→c2 to discharge oil; when the pressure sensing chamber 230 is filled with oil, hydraulic oil enters C2 from the second oil passage 440, and then enters the pressure sensing chamber 230 from C2-F-a 1.

When the isolation valve 450 is in the hydraulic control position, the port A2 is communicated with the port E, the port B2 is communicated with the port F, the port C2 is blocked, the port E and the port F are communicated with the pressure sensitive chamber 230 through the port a1, the port A2 is communicated with the first oil path 210, and the port B2 is communicated with the second end of the third oil path 430; when the control valve 240 controls the oil to enter the pressure sensitive chamber 230, the hydraulic oil in the first oil passage 210 enters the pressure sensitive chamber 230 through A2-E-a 1 in sequence, part of the hydraulic oil in the pressure sensitive chamber 230 enters the third oil passage 430 through a 1-F-B2 for discharging oil, and when the oil entering the pressure sensitive chamber 230 is constant with the oil discharged from the pressure sensitive chamber 230, the pressure load force of the pressure sensitive chamber 230 is equal to the differential pressure load of the main distributing valve 100 again, and the main distributing valve 100 outputs constant flow; when the control valve 240 controls the oil discharge to the pressure sensing chamber 230, part of the hydraulic oil in the pressure sensing chamber 230 enters the first oil passage 210 through a 1-E-A2 and discharges the oil, the hydraulic oil in the third oil passage 430 sequentially enters the pressure sensing chamber 230 through B2-F-a 1, and when the oil amount of the oil entering the pressure sensing chamber 230 and the oil discharged from the pressure sensing chamber 230 is constant, the pressure load force of the pressure sensing chamber 230 is equal to the differential pressure load of the main distributing valve 100 again, and the main distributing valve 100 outputs a constant flow.

The isolating device further comprises a b1 channel, a p1 channel and a t2 channel which are arranged on the control valve body 411, and a p1-1 channel communicated with the p1 channel, a p1-2 channel communicated with the p1 channel and a b2 channel which can be communicated with the b1 channel in the moving process are arranged on the piston 418; a pressure oil valve disc 416 movably blocking one end of the p1-1 channel and a control valve disc 417 movably blocking one end of the b1 channel and capable of synchronously moving with the pressure oil valve disc 416 are arranged in the oil chamber in the piston 418; a first oil chamber 463 is formed between the control valve disc 417 and the pressure oil valve disc 416, the first oil chamber 463 is a part of an oil chamber of the piston 418, one end of the p1-2 channel is communicated with the first oil chamber 463, the p1 channel is communicated with a hydraulic oil source, one end of the t2 channel is communicated with an oil return oil path, the other end of the t2 channel is communicated with a second oil chamber 464, and the second oil chamber 464 is an oil chamber area corresponding to one side of the control valve disc 417, which is away from the pressure oil valve disc 416.

The isolating device is further provided with a t1 channel and a c1 channel which are arranged on the control valve body 411, a t1-1 channel which is communicated with the t1 channel in the moving process is arranged on the piston 418, and a c1-1 channel which is communicated with the c1 channel in the moving process is arranged on the piston 418; an oil return valve disc 415 and an oil release valve disc 414 which are movably blocked at one end of the t1-1 channel are arranged in the oil chamber in the piston 418, a third oil cavity 461 is formed between the oil return valve disc 415 and the oil release valve disc 414, and a fourth oil cavity 462 is formed between the oil return valve disc 415 and the pressure oil valve disc 416.

The main pressure distribution valve 100 has an on state, an off state, and a reset state.

When the isolation valve 450 is in the motor control position and the main pressure distribution valve 100 is in the reset state, the oil return valve disc 415 seals the t1-1 port, the pressure oil valve disc 416 seals the p1-1 port, the control valve disc 417 seals the b1-1 port, i.e., the second oil passage 440 is sealed off, the third oil passage 430 is sealed off, and no hydraulic oil flows between the third oil passage 430 and the second oil passage 440 at this time; when the isolation valve 450 is in the motor control position and the main pressure distribution valve 100 is in the start-up state, the third oil path 430 is blocked, the second oil path 440 is conducted, and hydraulic oil enters the first oil chamber 463 from the p port through the p1-2 port, enters the b1 port, enters the a1 port through the C2 port and the F port, and enters the pressure sensitive chamber 230; when the isolation valve 450 is in the motor control position and the main pressure distribution valve 100 is in the off state, hydraulic oil enters the a1 port from the pressure sensitive chamber 230, and then drains through the F port, the C2 port, the b1-1 port, the second oil chamber 464 and the t2 port in sequence.

When the isolation valve 450 is in the hydraulic control position and the main distributing valve 100 is in the reset state, the oil return valve disc 415 seals the t1 port, the pressure oil valve disc 416 seals the p1-1 port, the control valve disc 417 seals the b1 port, that is, the second oil path 440 is sealed, the third oil path 430 is sealed, and no hydraulic oil flows in the third oil path 430 and the second oil path 440; when the isolation valve 450 is in the hydraulic control position and the main distributing valve 100 is in the on state, the piston 418 moves downward relative to the control valve core 412, the port B1 is blocked, i.e. the second oil path 440 is blocked, the first oil path 210 inputs hydraulic oil into the pressure sensitive chamber 230, part of hydraulic oil in the pressure sensitive chamber 230 is drained through the third oil path 430, i.e. hydraulic oil in the first oil path 210 sequentially passes through A2- & gt, E- & gt, a1 to enter the pressure sensitive chamber 230, and part of hydraulic oil in the pressure sensitive chamber 230 enters the third oil path 430 through a 1- & gt, F- & gt, B2- & gt, c1- & gt, and fourth oil chamber 462- & gt 1-1 to enter the third oil path 430 to drain; when the isolation valve 450 is in the hydraulic control position and the main regulator valve 100 is in the closed state, the piston 418 moves upward with respect to the control valve spool 412, the port B1-1 is blocked, i.e., the second oil path 440 is blocked, the third oil path 430 inputs hydraulic oil to the pressure sensitive chamber 230, part of the hydraulic oil in the pressure sensitive chamber 230 is drained through the first oil passage 210, that is, part of the hydraulic oil in the pressure sensitive chamber 230 enters the first oil passage 210 through a1→e→a2 and drains, and the hydraulic oil in the third oil passage 430 enters the pressure sensitive chamber 230 through p1→p1-1→fourth oil chamber 462→c1-1→c1→b2→f→a1 in sequence.

The hydraulic control device includes a control valve 240 disposed on the first oil path 210, and configured to control the first oil path 210 to feed or return oil to the pressure sensitive chamber 230 when the hydraulic control device is in operation.

The control valve 240 is a three-position four-way proportional valve, and is provided with an A1 port, a B1 port, a T1 port and a P1 port, and when the control valve 240 is positioned at a reset position, the A1 port, the B1 port, the T1 port and the P port are blocked; when the control valve 240 is in the first position, the first oil passage 210 supplies oil to the pressure sensitive chamber 230 through the P1 port and the A1 port; when the control valve 240 is in the second position, the pressure sensitive chamber 230 of the first oil passage 210 discharges oil through the port A1 and the port T1.

Specifically, when the control valve 240 is in the first position, the port A1 is communicated with the pressure sensitive chamber 230, the port A1 is communicated with the port P1, the port P1 is communicated with the hydraulic oil source, the port B1 is communicated with the port T1, the port T1 is communicated with the oil return tank, and the port B1 is blocked; when the control valve 240 is in the second position, the port A1 is in communication with the pressure sensitive chamber 230, the port A1 is in communication with the port T1, the port T1 is in communication with the oil return tank, the port P1 is in communication with the hydraulic oil source, the port P1 is also in communication with the port B1, and the port B1 is blocked.

Referring to fig. 4, the transmission structure includes a motor 310, a ball screw 330, a control valve core 412 and a first elastic reset member 420, where the motor 310 is disposed on the control valve body 411, an output end of the motor 310 is connected with an input end of the ball screw 330, an output end of the ball screw 330 is connected with the control valve core 412, the control valve core 412 is movably connected with the piston 418, and the control valve core 412 is connected with the pressure distribution valve core 120 through the first elastic reset member 420.

Referring to fig. 4, the transmission structure further includes a coupling 320, a transmission shaft 340, a support 350, and a second elastic restoring member 360, the motor 310 is disposed on the support 350, the support 350 is disposed on the control valve body 411, the coupling 320 connects the motor 310 with the ball screw 330, an output end of the ball screw 330 is connected with the transmission shaft 340, the transmission shaft 340 is slidably connected with respect to the support 350, and the transmission shaft 340 is connected with the control valve core 412 through the second elastic restoring member 360. In this way, the motor 310 may drive the ball screw 330 to move, the ball screw 330 drives the transmission shaft 340 to slide relative to the bracket, and the transmission shaft 340 drives the control valve core 412 to move through the second elastic reset member 360, so that the control valve core 412 drives the first elastic reset member 420 to drive the pressure distribution valve core 120 to move, thereby controlling the main pressure distribution valve 100.

Preferably, the ball screw 330 is a self-resetting ball screw 330, since the transmission shaft 340 is connected with the control valve core 412 through the second elastic reset member 360, the pressure distribution valve core 120 is connected with the control valve core 412 through the first elastic reset member 420, the pressure distribution valve core 120 is connected with the pressure distribution valve body 110 through the third elastic reset member 492, and the ball screw 330 is a self-resetting ball screw 330, when the oil pressure is removed, for example, when the oil pressure of the hydraulic oil source is zero, the pressure distribution valve core 120 can be in a reset state under the action of the first elastic reset member 420, the third elastic reset member 492 and the second elastic reset member 360.

Further, an adjustable hand wheel 370 is further disposed on the motor 310, and the adjustable hand wheel 370 is used for adjusting the position of the transmission shaft 340, so as to further adjust the control valve core 412 and the pressure distribution valve core 120.

Preferably, the motor 310 is a servo motor 310.

Wherein, the first elastic restoring member 420 is preferably a spring.

Further, referring to fig. 2, a first bushing 471 is disposed between the piston 418 and the control valve core 412, the piston 418 and the first bushing 471 are relatively fixed, and the b1 port, the c1 port, the t1 port, the p1-1 port, and the p1-2 port penetrate the first bushing 471. By providing the first bushing 471, the useful life of the piston 418 is increased and costs are reduced.

Further, referring to fig. 2, a limiting plate 481 is disposed at the upper end of the control valve core 412, a limiting pin 482 extending toward the control valve body 411 is disposed on the limiting plate 481, a limiting pull rod 483 is fixed on the control valve body 411, and the limiting pull rod 483 passes through a through hole on the limiting plate 481 to be in threaded connection with a limiting nut 484. In this way, the distance that the control valve core 412 moves relative to the control valve body 411 can be limited by the limit pin 482, the limit pull rod 483, and the limit plate 481. Specifically, the distance that the control valve element 412 descends relative to the control valve body 411 is limited by the limiting pin 482 and the limiting plate 481, and the distance that the control valve element 412 ascends relative to the control valve body 411 is controlled by the limiting pull rod 483 and the limiting plate 481.

Referring to fig. 5 and 6, the isolation valve 450 is a hydraulic isolation valve 450, the isolation valve 450 is further provided with an X port and a Y port, and when the Y port is used for oil feeding and the X port is used for oil discharging, the isolation valve 450 is in a hydraulic control position; when the Y port discharges oil and the X port discharges oil, the isolation valve 450 is in the motor control position.

Referring to fig. 1, the isolation device further includes a passage switching valve 491, wherein the passage switching valve 491 is communicated with an X port and a Y port of the isolation valve 450, and is used for oil return from the Y port when oil is supplied to the X port or oil return from the X port when oil is supplied to the Y port.

Referring to fig. 3, the main pressure distributing valve 100 is a three-position four-way valve, the pressure distributing valve core 120 includes a pressure distributing main body, a pressure distributing upper valve disc 140 and a pressure distributing lower valve disc 150 which are sequentially arranged on the pressure distributing main body, the pressure distributing upper valve disc 140 is closer to the control valve body than the pressure distributing lower valve disc 150, the main pressure distributing valve 100 is provided with a KJ port, a GJ port, a PJ port and a T port, the PJ port is communicated with a hydraulic oil source, the T port is communicated with an oil return oil path, the KJ port, the GJ port are communicated with an output oil path, and the area of the pressure distributing upper valve disc 140 is larger than that of the pressure distributing lower valve disc 150.

When the main distribution valve 100 is in a reset state, the KJ port is blocked by the distribution lower valve disc 150, and the GJ port is blocked by the distribution upper valve disc 140; when the main distributing valve 100 is in the closed state, hydraulic oil flows out from the PJ port, the distributing cavity and the GJ, and the hydraulic oil is discharged into the oil return tank from the KJ-T port.

Referring to fig. 3, the pressure distributing valve core 120 is connected to the pressure distributing valve body 110 through a third elastic restoring member 492. The third elastic restoring member 492 is preferably a spring.

Referring to fig. 3, a second bushing 493 is disposed between the pressure distribution valve body 110 and the pressure distribution valve core 120, and the second bushing 493 is connected to the pressure distribution valve body 110. The KJ, GJ, PJ ports are provided through the second bushing 493.

Further, the area of the pressure sensitive chamber 230 on the first end face of the control valve spool 412 is twice the difference between the area of the pressure-distributing upper valve disc 140 and the area of the pressure-distributing lower valve disc 150.

Referring to fig. 7, fig. 8, fig. 9 and fig. 10, fig. 7 is a control schematic diagram of an electro-hydraulic control valve set in a reset state in an embodiment of the present utility model, fig. 8 is a control schematic diagram of a motor control device 300 in the electro-hydraulic control valve set in an embodiment of the present utility model when the motor control device 300 in the electro-hydraulic control valve set in the embodiment of the present utility model controls a valve core 120 of the main valve 100 to move in a closing direction of a control servomotor 500, fig. 9 is a control schematic diagram of a hydraulic control device in the electro-hydraulic control valve set in an embodiment of the present utility model when the valve core 120 in the main valve 100 is moved in a closing direction of the control servomotor 500, and in this embodiment, the working principle of the electro-hydraulic control valve set is as follows:

first, the isolation valve 450 in the isolation device is in the motor control position for causing the motor control device 300 to control the operation of the pressure distribution valve core 120 of the main pressure distribution valve 100 under the control of the channel switching valve 491. At this time, the motor control device 300 may control the operation of the pressure distribution valve core 120 of the main pressure distribution valve 100, so that the main pressure distribution valve 100 is in a reset state, and controls the power-off state when the servomotor 500 moves in the closing direction, and the power-on state when the servomotor 500 moves in the power-on direction.

Specifically, when the motor control device 300 controls the pressure distribution valve core 120 of the main pressure distribution valve 100 to act so that the main pressure distribution valve 100 is in a reset state, the pressure distribution valve disc 150 and the pressure distribution valve disc 140 on the pressure distribution valve core 120 respectively block the KJ port and the GJ port; the control valve disc 417 on the control spool 412 seals port b1-1, the pressure oil valve disc 416 seals port p1-1, and the oil return valve disc 415 seals port t1-1, i.e., ports b1, p1, and t 1. When the motor control device 300 controls the pressure distribution valve core 120 of the main pressure distribution valve 100 to act so that the main pressure distribution valve 100 is in the closed state, namely, the port a1 discharges oil, the pressure of the hydraulic oil in the pressure sensitive cavity 230 is reduced, and at the same time, the control valve core 412 acts upwards, namely, moves towards the direction approaching the motor 310, referring to fig. 9, the pressure sensitive cavity 230 is communicated with the port F of the isolation valve 450 through the port a1, at the same time, the port F of the isolation valve 450 is communicated with the port C2, the port C2 is communicated with the port b1, the port b1 is communicated with the port t2, and the hydraulic oil in the pressure sensitive cavity 230 flows from the pressure sensitive cavity 230 to the direction from the port a1 to the port F to the port C2 to the port b1-1 to the port t2, and the direction from the port t2 to the oil return tank. When the motor control device 300 controls the action of the pressure distribution valve core 120 of the main pressure distribution valve 100 to enable the main pressure distribution valve 100 to be in a starting state, namely, the port a1 is used for feeding oil, the pressure of hydraulic oil in the pressure sensitive cavity 230 rises, at the moment, the control valve core 412 is controlled to act downwards, namely, the control valve core moves in a direction away from the motor 310, the oil ports p1 and b1 are communicated, the pressure sensitive cavity 230 is communicated with the port F of the isolation valve 450 through the port a1, at the moment, the port F of the isolation valve 450 is communicated with the port C2, the port C2 is communicated with the port b1 and the port b1-1, the port b1 is communicated with the port p1, and the hydraulic oil is communicated from the port p 1-2-b 1-b 1-C2-F-a 1-pressure sensitive cavity 230. Because the motion of the control valve element 412 is controlled by the motor 310, when the motor 310 is the servo motor 310, the motion of the control valve element 412 can be proportionally controlled by the servo motor 310, and then the control valve element 412 is used for controlling the pressure distribution valve element 120, so that the control of the main pressure distribution valve 100 is realized, the servomotor 500 is controlled by the main pressure distribution valve 100, and the hydro-generator set is controlled by the servomotor 500.

Next, the isolation valve 450 in the isolation device is in the hydraulic control position for the hydraulic control device to control the operation of the pressure distribution valve spool 120 of the main pressure distribution valve 100 under the control of the passage switching valve 491. At this time, the hydraulic control device may control the action of the pressure distribution valve core 120 of the main pressure distribution valve 100, so that the main pressure distribution valve 100 is in a reset state, and controls the power-off state when the servomotor 500 moves in the closing direction, and the power-on state when the servomotor 500 moves in the power-on direction.

Specifically, when the hydraulic control device controls the pressure distribution valve core 120 of the main pressure distribution valve 100 to act so that the main pressure distribution valve 100 is in a reset state, the pressure distribution valve disc 150 and the pressure distribution valve disc 140 on the pressure distribution valve core 120 respectively block the KJ port and the GJ port; the control valve disc 417 on the control valve spool 412 seals the port b1, the pressure oil valve disc 416 seals the port p1, and the oil return valve disc 415 seals the port t1, i.e., the ports b1, p1, and t 1. When the hydraulic control device controls the pressure distribution valve core 120 of the main pressure distribution valve 100 to act so that the main pressure distribution valve 100 is in a shutdown state, namely, the hydraulic oil in the pressure sensing chamber 230 drops, at this time, the pressure distribution valve core 120 and the piston 418 move upwards, namely, move towards the direction approaching the motor 310, referring to fig. 10, the pressure sensing chamber 230 is communicated with the port E and the port F of the isolation valve 450 through the port a1, at this time, the port E and the port A2 of the isolation valve 450 are communicated, the port F and the port B2 are communicated, the port A2 is communicated with the control valve 240, the port B2 is communicated with the port c1, the port c1 is communicated with the port p1, part of the hydraulic oil enters the pressure sensing chamber 230 from p 1-c 1-B2-F-a 1, part of the hydraulic oil enters the control valve 240 from a 1-E-A2 in the pressure sensing chamber 230, then enters the return tank, and after the oil entering the pressure sensing chamber 230 is constant with the oil discharged from the pressure sensing chamber 230, the pressure sensing chamber pressure is again equalized with the main pressure load pressure distribution valve 100, and the differential pressure of the main pressure distribution valve 100 is constant. When the hydraulic control device controls the pressure distribution valve core 120 of the main pressure distribution valve 100 to act so that the main pressure distribution valve 100 is in a starting state, namely, hydraulic oil in the pressure sensitive cavity 230 rises, at this time, the pressure sensitive cavity 120 and the piston 418 act downwards, namely, move away from the motor 310, the pressure sensitive cavity 230 is communicated with the E port and the F port of the isolation valve 450 through the a1 port, at this time, the E port and the A2 port of the isolation valve 450 are communicated, the F port and the B2 port are communicated, the A2 port is communicated with the control valve 240, the B2 port is communicated with the c1 port, the c1 port is communicated with the t1 port, part of hydraulic oil in the pressure sensitive cavity 230 enters the oil return tank from the a 1- & gt F- & gt 2- & gtc 1- & gtt 1, part of hydraulic oil enters the A2 port from the control valve 240 and enters the pressure sensitive cavity 230 from the A2- & gtE- & gta 1, and after the oil amount of the oil entering the pressure sensitive cavity 230 and the oil amount discharged from the pressure sensitive cavity 230 are constant, the pressure sensitive cavity pressure load force is re-equalized with the main pressure distribution valve 100, and differential pressure load is constant, and the differential pressure load is output by the main pressure distribution valve 100. Because the control valve 412 acts under the control of the control valve 240, when the control valve 240 is the servo control valve 240, the servo control valve 240 can be used for proportional control of the action of the control valve 412, and then the control valve 412 is used for controlling the pressure distribution valve 120, so that the control of the main pressure distribution valve 100 is realized, the servomotor 500 is controlled through the main pressure distribution valve 100, and the hydraulic generator set is regulated and controlled through the servomotor 500.

Referring to fig. 7, 8, 9 and 10, the present embodiment further provides a servo control device, which includes a hydraulic oil source, a servomotor 500, and the electrohydraulic control valve set in the foregoing embodiment, where the hydraulic oil source is in communication with the isolation device and the main distributing valve 100, and the main distributing valve 100 is in communication with the servomotor 500.

Specifically, the servomotor 500 has a relay oil chamber and a relay piston 530 disposed in the relay oil chamber, the relay piston 530 dividing the relay oil chamber into a first relay oil chamber 510 and a second relay oil chamber 520, the GJ port being in communication with the first relay oil chamber 510, and the KJ port being in communication with the second relay oil chamber 520.

The hydraulic oil of the hydraulic oil source is filtered by the oil filter 600 and then enters the first oil path and the p port. The hydraulic oil is controlled by the emergency stop valve 700 before entering the first oil passage and the p port.

The embodiment also provides a hydroelectric generating set adjusting system, wherein the hydroelectric generating set comprises a blade water guide mechanism and the servo control device in the embodiment, and the servomotor 500 in the servo control device is connected with the blade water guide mechanism.

The above description is only illustrative of the preferred embodiments of the present utility model and is not intended to limit the scope of the present utility model, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims.

Claims (10)

1. The electrohydraulic control valve group comprises a main distributing valve, wherein the main distributing valve comprises a distributing valve body and a distributing valve core which is arranged in the distributing valve body and is in sliding connection with the distributing valve body, and the electrohydraulic control valve is characterized by further comprising a hydraulic control device, a motor control device and an isolating device, wherein the isolating device comprises a control valve body and a piston which is positioned in the control valve body, the hydraulic control device comprises a first oil way for driving the piston to linearly move, the motor control device comprises a transmission structure for driving the piston to linearly move, and the piston is fixedly connected with the distributing valve core.

2. The electro-hydraulic control valve set of claim 1, wherein the piston and the control valve body form a pressure sensitive chamber that urges the piston to move, the first oil passage being in communication with the pressure sensitive chamber.

3. The electro-hydraulic control valve set of claim 2, further comprising an oil return circuit, wherein the isolation device further comprises a second oil circuit communicated with both the oil return circuit and a hydraulic oil source, and an isolation valve capable of controlling the second oil circuit to feed oil or return oil to the pressure sensitive cavity when the motor control device works.

4. The electro-hydraulic control valve set of claim 3, wherein said isolation valve is a two-position five-way valve comprising a C2 port and an F port, said C2 port in movable communication with said F port, said C2 port in communication with said second oil path, said F port in communication with said pressure sensitive chamber.

5. The electrohydraulic control valve assembly of claim 4, wherein said isolation device further has a b1 passage, a p1 passage, and a t2 passage formed in said control valve body, a p1-1 passage formed in said piston in communication with said p1 passage, a p1-2 passage formed in communication with said p1 passage, and a b2 passage formed in said piston in communication with said b1 passage during movement; the piston oil chamber is provided with a pressure oil valve disc which is movably used for blocking one end of the p1-1 channel and a control valve disc which is movably used for blocking one end of the b1 channel and can synchronously move with the pressure oil valve disc; a first oil cavity is formed between the control valve disc and the pressure oil valve disc, the first oil cavity is a part of an oil cavity of the piston, one end of the p1-2 channel is communicated with the first oil cavity, the p1 channel is communicated with a hydraulic oil source, one end of the t2 channel is communicated with an oil return oil path, the other end of the t2 channel is communicated with a second oil cavity, and the second oil cavity is an oil cavity area corresponding to one side of the control valve disc, which is away from the pressure oil valve disc.

6. The electro-hydraulic control valve set of claim 2, wherein the hydraulic control device includes a control valve disposed on the first oil passage for controlling the first oil passage to supply or return oil to the pressure sensitive chamber when the hydraulic control device is in operation.

7. The electro-hydraulic control valve set of claim 1, wherein the transmission structure comprises a motor, a ball screw, a control valve core and a first elastic reset element, the motor is arranged on the control valve body, an output end of the motor is connected with an input end of the ball screw, an output end of the ball screw is connected with the control valve core, the control valve core is movably connected with the piston, and the control valve core is connected with the pressure distribution valve core through the first elastic reset element.

8. The electro-hydraulic control valve set of claim 1, wherein the main pressure distribution valve is a three-position four-way valve, the pressure distribution valve core comprises a pressure distribution main body, and a pressure distribution upper valve disc and a pressure distribution lower valve disc which are sequentially arranged on the pressure distribution main body, the pressure distribution upper valve disc is closer to the control valve body than the pressure distribution lower valve disc, the main pressure distribution valve is provided with a KJ port, a GJ port, a PJ port and a T port, the PJ port is communicated with a hydraulic oil source, the T port is communicated with an oil return oil path, the KJ port and the GJ port are communicated with an output oil path, and the area of the pressure distribution upper valve disc is larger than that of the pressure distribution lower valve disc.

9. A servo control device comprising a hydraulic oil source, a servomotor, and an electrohydraulic control valve set according to any one of claims 1 to 8, said hydraulic oil source being in communication with said isolation device and said main pressure valve, said main pressure valve being in communication with said servomotor.

10. A hydroelectric generating set adjusting system, comprising a blade water guiding mechanism and the servo control device according to claim 9, wherein a servomotor in the servo control device is connected with the blade water guiding mechanism.