CN212867759U

CN212867759U - Small-size hydraulic turbine speed regulator shuts down interlocking control system

Info

Publication number: CN212867759U
Application number: CN202021535935.7U
Authority: CN
Inventors: 江凤; 劳鹏飞; 赵伟俊; 肖曦坤; 刘犇成; 余毅
Original assignee: WUHAN SANLIAN HYDROPOWER CONTROL EQUIPMENT CO Ltd
Current assignee: WUHAN SANLIAN HYDROPOWER CONTROL EQUIPMENT CO Ltd
Priority date: 2020-07-30
Filing date: 2020-07-30
Publication date: 2021-04-02
Anticipated expiration: 2030-07-30

Abstract

The utility model discloses a small-size hydraulic turbine speed regulator shuts down interlocking control system, including electrical control return circuit and hydraulic control return circuit, electrical control return circuit is including shutting down reserve relay KR411, start relay KR412, emergency shutdown action relay KR451, and DC220V positive power is connected with the A coil positive signal terminal and the B coil positive signal terminal of emergency shutdown solenoid valve 111EV through first circuit and second circuit respectively, and DC220V power negative pole is connected with the A coil negative signal terminal and the B coil negative signal terminal of emergency shutdown solenoid valve 111EV through third circuit and fourth circuit respectively. The utility model discloses under the problem that does not influence original function of speed regulator and operation, through redesign electrical control return circuit, utilize original equipment and component, perfect solution the cost of small-size hydraulic turbine servomotor lock spindle device, installation and the selection difficult problem between the operation, solved small-size speed regulator again frequently under shutting down standby state and adjusted, servomotor drift, stator leak the scheduling problem.

Description

Small-size hydraulic turbine speed regulator shuts down interlocking control system

Technical Field

The utility model relates to a hydraulic turbine technical field, more specifically the utility model relates to a small-size hydraulic turbine speed regulator shuts down interlock control system.

Background

When the guide vane of the water distributor is closed after the water turbine stops, the guide vane has a trend of running towards an open side under the action of pressure water from the volute and elastic sealing in the guide vane, the deformation of the connecting arm, the gaps among all pin shafts and the like, and in order to avoid the water leakage phenomenon caused by the operation, after the guide vane is closed by the servomotor, the servomotor is continuously closed for a section of stroke, so that the guide vane has a compression amount of several millimeters after being closed, namely the compression stroke of the guide vane servomotor. Because the guide vane servomotor has the compression stroke, if the pressure of the switch cavity of the guide vane servomotor is controlled to be equal, the pressure of the open cavity of the guide vane servomotor is greater than the pressure of the closed cavity under the action of the compression stroke of the servomotor, the guide vane servomotor drifts towards the opening direction, the compression stroke of the servomotor is counteracted, the guide vane water leakage is caused, the servomotor lock spindle is blocked and can not be pulled out when the machine is started, and the unit creeps or even rotates under the shutdown standby state if the water leakage amount is large, so that the even more serious accidents of water leakage, automatic start failure, tile burning and the like are caused.

Therefore, when the unit is stopped stably, the speed regulator of the water turbine is in a stop standby state, the regulator can supply certain off-limit quantity to the electro-hydraulic converter, pressure is supplied to the closing cavity of the guide vane servomotor through the electro-hydraulic converter, the resilience force of the compression stroke of the guide vane is offset, and the guide vane is maintained in a full-closed state.

The prior hydraulic turbine servomotor locking device is mostly in a mechanical hydraulic type or manual operation type; the large and medium-sized hydroelectric generating sets adopt mechanical hydraulic locking ingots, and the small-sized hydroelectric generating sets adopt manual operation type mechanical locking ingots. The working principle of mechanical hydraulic and manual operation servomotor locking is the same, namely: after the servomotor is completely closed, the locking spindle is put in, and the servomotor is prevented from moving by the limiting block; different methods for operating the locking ingot casting and withdrawing; the mechanical hydraulic locking spindle controls the movement of the limiting block by remotely operating the locking spindle throwing and withdrawing hydraulic cylinder to achieve the purpose of throwing or withdrawing the locking spindle; the manual locking spindle realizes the throwing and withdrawing of the locking spindle by manually operating the displacement of the locking spindle limiting block.

The manual operation type hydraulic turbine servomotor locking ingot needs operators to operate on site every time the hydraulic turbine servomotor locking ingot is put into and taken out, time and labor are wasted, efficiency is low, and particularly, all hydropower stations put forward a few unattended operation modes on duty at present. The locking ingot is put in and withdrawn to be a problem which needs to be solved urgently for small hydropower stations.

The electro-hydraulic converter of the small-sized water turbine speed regulating system is mostly controlled by a high-speed ball valve, pressure can not be supplied to a servomotor closing cavity in real time, when the drift amount of the servomotor is larger than a control dead zone of an adjuster, a speed adjuster outputs a closing signal to close the servomotor, and the water turbine speed regulating system in a shutdown standby state can be frequently adjusted due to the repeated operation.

SUMMERY OF THE UTILITY MODEL

The utility model discloses solve the technical problem who exists among the prior art to a small-size hydraulic turbine speed regulator shuts down interlock control system is provided.

The above technical problem of the present invention can be solved by the following technical solutions:

a small-sized hydraulic turbine speed governor shutdown interlocking control system comprises an electrical control loop and a hydraulic control loop, wherein the electrical control loop comprises a shutdown standby relay KR411, a startup relay KR412 and an emergency shutdown action relay KR451, a power anode of a DC220V is respectively connected with a coil A positive signal terminal and a coil B positive signal terminal of an emergency shutdown electromagnetic valve 111EV through a first circuit and a second circuit, a power cathode of a DC220V is respectively connected with a coil A negative signal terminal and a coil B negative signal terminal of the emergency shutdown electromagnetic valve 111EV through a third circuit and a fourth circuit, a switch-in command switch and a normally closed contact of the emergency shutdown action relay KR451 are sequentially arranged on the first circuit, a normally open contact of the shutdown standby relay KR411 is connected in series with a normally closed contact of the startup relay KR412 and then connected in parallel with the switch-in command switch, a shutdown interlocking manual button SB1 is connected in parallel with the switch in parallel, be equipped with the normally open contact who withdraws from command switch and emergency shutdown action relay KR451 on the second line in proper order, the normally open contact of start relay KR412 is parallelly connected with withdrawing from the command switch, main coil one end and the PLC of shutting down reserve relay KR411 are connected, the main coil other end and the main coil one end of start relay KR412 of shutting down reserve relay KR411 are connected, the main coil other end of start relay KR412 passes through the start command switch and is connected with DC24V power, position switch SQ1 one end and DC24V power connection, emergency shutdown action relay KR main coil one end and the position switch SQ1 other end, PLC is connected, the emergency shutdown action relay KR451 main coil other end and DC24V power connection, the pilot lamp of shutting down interlock manual button SB1 is parallelly connected with emergency shutdown action relay KR451 main coil.

Further, the emergency stop solenoid valve 111EV is a pulse control type solenoid valve, and the emergency stop solenoid valve 111EV has an interlock protection structure.

Compared with the prior art, the utility model has the advantages of: the utility model discloses under the problem that does not influence original function of speed regulator and operation, through redesign electrical control return circuit, utilize original equipment and component, perfect solution the cost of small-size hydraulic turbine servomotor lock spindle device, installation and the selection difficult problem between the operation, solved small-size speed regulator again frequently under shutting down standby state and adjusted, servomotor drift, stator leak the scheduling problem. The speed regulating system of the small water turbine is more intelligent, more reliable and high in quality, and the function of unattended operation and unattended operation of a small hydropower station is realized on the basis of not increasing the hardware cost.

Drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram of an electrical control circuit according to the present invention.

Fig. 2 is a wiring diagram of a main coil of the solenoid valve in the middle electric control circuit of the present invention.

Fig. 3 is a schematic diagram of the hydraulic system of the speed governor of the present invention.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the attached drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making the scope of the present invention more clearly defined.

Referring to fig. 1-2, the present invention discloses a shutdown interlock control system for a small hydro governor, which comprises an electrical control circuit and a hydraulic control circuit, wherein the electrical control circuit comprises a shutdown standby relay KR411, a startup relay KR412 and an emergency shutdown action relay KR451, the positive pole of the DC220V power supply is connected with the positive signal terminal of the a coil and the positive signal terminal of the B coil of the emergency shutdown solenoid valve 111EV through a first circuit and a second circuit, the negative pole of the DC220V power supply is connected with the negative signal terminal of the a coil and the negative signal terminal of the B coil of the emergency shutdown solenoid valve 111EV through a third circuit and a fourth circuit, the first circuit is sequentially provided with a normally closed contact of the input command switch and the emergency shutdown action relay KR451, the normally open contact of the shutdown standby relay KR411 is connected in series with the normally closed contact of the startup relay KR412 and then connected in parallel with the input command switch, the manual button SB1 of shutting down interlocking is parallelly connected with the input command switch, be equipped with the normally open contact who withdraws from command switch and emergency shutdown action relay KR451 on the second line in proper order, the normally open contact of start relay KR412 is parallelly connected with withdrawing from the command switch, main coil one end and the PLC of shutting down reserve relay KR411 are connected, the main coil other end and the main coil one end of start relay KR412 of shutting down reserve relay KR411 are connected, the main coil other end of start relay KR412 is connected with DC24V power through the start command switch, position switch SQ1 one end is connected with DC24V power, emergency shutdown action relay KR main coil 451 one end and the position switch SQ1 other end, the PLC is connected, the main coil other end and DC24V power of emergency shutdown action relay KR451 is connected, the pilot lamp of shutting down interlocking manual button SB1 is parallelly connected with emergency shutdown action relay KR.

In the embodiment of the application, the emergency stop solenoid valve 111EV is a pulse control type solenoid valve, and the emergency stop solenoid valve 111EV has an interlock protection structure, so that a solenoid coil can be burned out in an effective manner due to long-time electrification.

Referring to fig. 3, the hydraulic control circuit includes a first actuation solenoid valve 311EV, a second actuation solenoid valve 311BV, a third actuation solenoid valve 312BV, an emergency stop solenoid valve 111EV, a first superimposed pilot operated check valve 401CV, a second superimposed pilot operated check valve 402CV, a first single throttle valve 501TV, a second single throttle valve 502TV, a superimposed pilot operated check throttle valve 503TV, a pilot operated directional control valve 711HV, a segmented solenoid valve 911EV, and a segmented throttle valve 911TV, a B chamber of the emergency stop solenoid valve 111EV is connected to a position switch SQ1, a T chamber of the second actuation solenoid valve 311BV, an a chamber of the emergency stop solenoid valve 111 is connected to a P chamber of the third actuation solenoid valve 312BV and a P chamber of the first actuation solenoid valve 311EV, pressurized oil is connected to a P chamber of the emergency stop solenoid valve 111EV, a P chamber of the pilot operated directional control valve 711HV, a P chamber of the segmented solenoid valve 911, and a P chamber of the second actuation solenoid valve 311BV, the cavity A of the second action electromagnetic valve 311BV is connected with the cavity X of the hydraulic control reversing valve 711HV, the cavity A of the third action electromagnetic valve 312BV is connected with the cavity Y of the hydraulic control reversing valve 711HV, the left coil of the sectional throttling valve 911TV is connected with the cavity T of the hydraulic control reversing valve 711HV and the cavity T of the first action electromagnetic valve 311EV, the right coil of the sectional throttling valve 911TV is connected with the cavity A of the sectional electromagnetic valve 911EV, the cavity A and the cavity B of the hydraulic control reversing valve 711HV are connected with the first single-term throttling valve 501TV through the first superposed hydraulic control one-way valve 401CV, the cavity A and the cavity B of the first action electromagnetic valve 311EV are connected with the second superposed hydraulic control one-way valve 402CV, the second superposed hydraulic control one-way throttling valve 402CV is connected with the superposed hydraulic control one-way throttling valve 503TV, and two output ends of the superposed hydraulic control one-way throttling valve 503TV are respectively connected with the closing cavity of the hydraulic turbine relay mechanism through the first single-way throttling valve, two output ends of the first superposition type hydraulic control one-way valve 401CV are respectively connected with an opening cavity of a hydraulic turbine water guide mechanism servomotor through a first single throttle valve 501TV and a second single throttle valve 502 TV.

The utility model discloses a theory of operation does: after the hydraulic generator is shut down, the speed regulator is switched to a 'shut-down standby' state, at the moment, the electric regulator of the speed regulating system outputs a shut-down standby signal through the PLC to control the shut-down standby relay KR411, and normally open contacts KR411:9 and KR411:5 of the shut-down standby relay KR411 are closed. At this time, no 'starting order' exists, so the normally closed contacts KR412:9 and KR412:1 of the starting relay KR412 are in the closed positions, if the emergency stop does not act, the normally closed contacts KR451:12 and KR51:4 of the emergency stop action relay KR451 are also in the closed positions, and if the DC220V power supply is normal, the input coil of the emergency stop electromagnetic valve 111EV is electrified, and the emergency stop is input; when the position signal SQ1 for emergency stop is turned on after the emergency stop is turned on, the normally closed contact of the emergency stop operation relay KR451 is opened, and the emergency stop solenoid valve 111EV is held at the on position and the on coil is not energized. When the emergency stop solenoid valve 111EV is actuated, the pressure oil P chamber and the closed chamber B chamber are communicated, and the position switch SQ1 is actuated to cut off the pressure oil of the third actuation solenoid valve 312BV and the first actuation solenoid valve 311EV in fig. 3. The valve core of the hydraulic control reversing valve 711HV moves rightwards, so that a cavity P and a cavity B of the hydraulic control reversing valve 711HV are communicated, a cavity A and a cavity T are communicated, the left oil way of the first superposition type hydraulic control one-way valve 401CV is conducted reversely, the right oil way of the first superposition type hydraulic control one-way valve 401CV is conducted forwardly, the starting cavity of the guide vane servomotor is communicated with oil return, the starting cavity of the guide vane servomotor is communicated with pressure oil, the pressure of the starting cavity of the guide vane servomotor is greater than that of the starting cavity, and the servomotor is always in.

When the speed governor receives a starting order, the speed governor system is turned to a starting process state, the stop standby signal disappears, the normally open contacts KR412:12 and KR412:8 of the starting relay KR412 are conducted, because the emergency stop is at the input position, the normally open contacts KR451:10 and KR451:6 of the emergency stop action relay KR451 are conducted, the exit coil of the emergency stop electromagnetic valve 111EV is electrified, the emergency stop electromagnetic valve 111EV is kept at the exit position, and similarly, the exit coil is not electrified due to the addition of the interlocking protection function in the circuit. After the emergency stop solenoid valve 111EV is switched to the exit position, the pressure oil P chamber is communicated with the a chamber, the position switch SQ1 is reset, the pressure oil of the third motion solenoid valve 312BV and the first motion solenoid valve 311EV is communicated, and the governor system can be normally started.

The utility model discloses utilize hydraulic control return circuit's emergency stop solenoid valve 111EV as realizing servomotor lock spindle function and imitative drift protection to do not influence normal emergency stop control. When the unit is in failure and needs emergency shutdown, the emergency shutdown electromagnetic valve can be switched in by the upper computer or the speed regulator through a shutdown interlocking manual button SB 1.

The utility model discloses under the problem that does not influence original function of speed regulator and operation, through redesign electrical control return circuit, utilize original equipment and component, perfect solution the cost of small-size hydraulic turbine servomotor lock spindle device, installation and the selection difficult problem between the operation, solved small-size speed regulator again frequently under shutting down standby state and adjusted, servomotor drift, stator leak the scheduling problem. The speed regulating system of the small water turbine is more intelligent, more reliable and high in quality, and the function of unattended operation and unattended operation of a small hydropower station is realized on the basis of not increasing the hardware cost.

The above description is only the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through creative work should be covered within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope defined by the claims.

Claims

1. A small-sized hydraulic turbine governor shutdown interlocking control system is characterized by comprising an electrical control circuit and a hydraulic control circuit, wherein the electrical control circuit comprises a shutdown standby relay KR411, a startup relay KR412 and an emergency shutdown action relay KR451, the positive pole of a DC220V power supply is respectively connected with a positive signal terminal of an A coil and a positive signal terminal of a B coil of an emergency shutdown electromagnetic valve 111EV through a first circuit and a second circuit, the negative pole of a DC220V power supply is respectively connected with a negative signal terminal of the A coil and a negative signal terminal of the B coil of the emergency shutdown electromagnetic valve 111EV through a third circuit and a fourth circuit, a switch-in command switch and a normally closed contact of the emergency shutdown action relay KR451 are sequentially arranged on the first circuit, a normally open contact of the shutdown standby relay KR411 is connected with a normally closed contact of the startup relay KR412 in series and then connected with the switch-in parallel, a shutdown interlocking manual button SB1 is connected with the switch in parallel, be equipped with the normally open contact who withdraws from command switch and emergency shutdown action relay KR451 on the second line in proper order, the normally open contact of start relay KR412 is parallelly connected with withdrawing from the command switch, main coil one end and the PLC of shutting down reserve relay KR411 are connected, the main coil other end and the main coil one end of start relay KR412 of shutting down reserve relay KR411 are connected, the main coil other end of start relay KR412 passes through the start command switch and is connected with DC24V power, position switch SQ1 one end and DC24V power connection, emergency shutdown action relay KR main coil one end and the position switch SQ1 other end, PLC is connected, the emergency shutdown action relay KR451 main coil other end and DC24V power connection, the pilot lamp of shutting down interlock manual button SB1 is parallelly connected with emergency shutdown action relay KR451 main coil.

2. The small hydro governor shutdown interlock control system according to claim 1, wherein the emergency shutdown solenoid valve 111EV is a pulse control type solenoid valve, and the emergency shutdown solenoid valve 111EV is provided with an interlock protection structure.