CN111550359B - Digital speed regulating system of low-voltage generator set water turbine - Google Patents
Digital speed regulating system of low-voltage generator set water turbine Download PDFInfo
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- CN111550359B CN111550359B CN202010438141.7A CN202010438141A CN111550359B CN 111550359 B CN111550359 B CN 111550359B CN 202010438141 A CN202010438141 A CN 202010438141A CN 111550359 B CN111550359 B CN 111550359B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 15
- 230000009471 action Effects 0.000 claims description 11
- 239000007921 spray Substances 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B15/00—Controlling
- F03B15/02—Controlling by varying liquid flow
- F03B15/04—Controlling by varying liquid flow of turbines
- F03B15/06—Regulating, i.e. acting automatically
- F03B15/08—Regulating, i.e. acting automatically by speed, e.g. by measuring electric frequency or liquid flow
- F03B15/12—Regulating, i.e. acting automatically by speed, e.g. by measuring electric frequency or liquid flow with retroactive action
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B15/00—Controlling
- F03B15/02—Controlling by varying liquid flow
- F03B15/04—Controlling by varying liquid flow of turbines
- F03B15/06—Regulating, i.e. acting automatically
- F03B15/18—Regulating, i.e. acting automatically for safety purposes, e.g. preventing overspeed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
- F03B3/16—Stators
- F03B3/18—Stator blades; Guide conduits or vanes, e.g. adjustable
- F03B3/183—Adjustable vanes, e.g. wicket gates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Control Of Water Turbines (AREA)
Abstract
The invention relates to a digital speed regulating system of a water turbine of a low-voltage generator set, wherein an oil inlet box is connected with an A port of a first two-position two-way electromagnetic valve, an A1 port of the first two-position two-way electromagnetic valve is connected with a forward end of a first valve bank, and a reverse end of the first valve bank is connected with an open cavity of a needle servomotor; the oil return tank is connected with an A port of the second two-position two-way electromagnetic valve, and an A1 port of the second two-position two-way electromagnetic valve is connected with the forward end of the first valve group. The oil inlet box is connected with an A port of a third two-position two-way electromagnetic valve, an A1 port of the third two-position two-way electromagnetic valve is connected with the forward end of a second valve group, and the reverse end of the second valve group is connected with a closed cavity of the needle servomotor; the oil return tank is connected with an A port of a fourth two-position two-way electromagnetic valve, and an A1 port of the fourth two-position two-way electromagnetic valve is connected with the positive end of the second valve group. The upper computer is electrically connected with the electromagnetic valve respectively. The digital speed regulating system of the low-voltage generator set water turbine can accurately realize the opening and closing of the needle relay.
Description
Technical Field
The invention relates to the technical field of low-voltage generator control, in particular to a digital speed regulating system of a water turbine of a low-voltage generator set.
Background
According to the needs of domestic early-stage rural power development, a large number of small hydropower stations for supplying power to users in county, villages and towns and the like in county-level regions are built, and a large number of low-voltage hydroelectric generating sets are put into operation in the power stations. The hydraulic turbines of the low-pressure hydraulic generator set are mostly impact type, and single spray needles are adopted to control the rotation and the output of the hydraulic turbines. The conventional water guide mechanism adopts a motor to drive a screw rod, and has the defects of small operation work, low action speed, low positioning precision, incapability of rapidly closing the water guide mechanism under the condition of power failure and the like. Along with the development needs of domestic rural power grids, the control precision, the operation reliability and the intelligent degree of the small hydropower station hydroelectric generating set need to be improved, and meanwhile, the power generation quality of the hydropower station is improved.
Disclosure of Invention
Aiming at the technical problems that a water guide mechanism of a water turbine of a low-voltage generator set is driven by a motor to drive a screw rod in the prior art, the invention has the advantages of small operation work, low action speed, low positioning precision and incapability of rapidly closing the water guide mechanism, the invention provides a digital speed regulating system of the water turbine of the low-voltage generator set.
The technical scheme for solving the technical problems is as follows:
A digital speed regulation system for a low voltage generator set hydraulic turbine, comprising: the device comprises an upper computer, a first two-position two-way electromagnetic valve, a second two-position two-way electromagnetic valve, a third two-position two-way electromagnetic valve, a fourth two-position two-way electromagnetic valve, a one-way throttle valve assembly, a needle servomotor, an oil inlet tank and an oil return tank;
the one-way throttle valve assembly includes: a first valve block and a second valve block; the first valve group comprises a first one-way valve and a first throttle valve which are connected in parallel; the second valve group comprises a second one-way valve and a second throttle valve which are connected in parallel;
the oil inlet box is connected with an A port of the first two-position two-way electromagnetic valve, an A1 port of the first two-position two-way electromagnetic valve is connected with the forward end of the first valve bank, and the reverse end of the first valve bank is connected with the cavity opening of the needle servomotor; the oil return tank is connected with an A port of the second two-position two-way electromagnetic valve, and an A1 port of the second two-position two-way electromagnetic valve is connected with the forward end of the first valve group;
The oil inlet box is connected with an A port of the third two-position two-way electromagnetic valve, an A1 port of the third two-position two-way electromagnetic valve is connected with the forward end of the second valve group, and the reverse end of the second valve group is connected with the closed cavity of the needle servomotor; the oil return tank is connected with an A port of the fourth two-position two-way electromagnetic valve, and an A1 port of the fourth two-position two-way electromagnetic valve is connected with the positive end of the second valve group;
the upper computer is respectively and electrically connected with the first two-position two-way electromagnetic valve, the second two-position two-way electromagnetic valve, the third two-position two-way electromagnetic valve and the fourth two-position two-way electromagnetic valve; the upper computer sends out a digital or discrete control signal to control the action of the electromagnetic valve.
Further, the oil inlet box includes: the first oil inlet box and the second oil inlet box; the oil return box comprises: the first oil return tank and the second oil return tank;
The first oil inlet box is connected with an A port of the first two-position two-way electromagnetic valve; the first oil return tank is connected with an A port of the second two-position two-way electromagnetic valve;
The second oil inlet box is connected with an A port of the third two-position two-way electromagnetic valve; the second oil return tank is connected with an A port of the fourth two-position two-way electromagnetic valve.
Further, the method further comprises the following steps: the first two-position three-way electromagnetic valve, the second two-position three-way electromagnetic valve, the third oil inlet tank and the third oil return tank;
The port A1 of the first two-position two-way electromagnetic valve is connected with the port B of the first two-position three-way electromagnetic valve, and the port B1 of the first two-position three-way electromagnetic valve is connected with the forward end of the first valve group;
The port A1 of the fourth two-position two-way electromagnetic valve is connected with the port B of the second two-position three-way electromagnetic valve, and the port B1 of the second two-position three-way electromagnetic valve is connected with the forward end of the second valve group;
an A port of the first two-position three-way electromagnetic valve is connected with the third oil return box; and an A port of the second two-position three-way electromagnetic valve is connected with the third oil inlet box.
Further, the method further comprises the following steps: an opening sensor;
The opening sensor is arranged in the needle servomotor and used for detecting the opening and closing degree of the needle servomotor; the opening sensor is electrically connected with the upper computer;
the first two-position three-way electromagnetic valve and the second two-position three-way electromagnetic valve are respectively and electrically connected with the upper computer.
Further, the upper computer includes:
the signal acquisition unit acquires an opening and closing degree signal of the needle servomotor uploaded by the opening sensor;
the opening control unit sends a first digital switching signal to the first two-position two-way electromagnetic valve and the fourth two-position two-way electromagnetic valve to control the first two-position two-way electromagnetic valve and the fourth two-position two-way electromagnetic valve to be electrically opened;
the closing control unit sends a second digital switch signal to the second two-position two-way electromagnetic valve and the third two-position two-way electromagnetic valve to control the second two-position two-way electromagnetic valve and the third two-position two-way electromagnetic valve to be electrically opened;
the processing unit is used for acquiring an opening and closing degree signal of the needle servomotor from the signal acquisition unit and processing the opening and closing degree signal to obtain an opening value of the needle servomotor; acquiring the first digital switching signal from the starting control unit; acquiring the second digital switching signal from the closing control unit; when the first digital switch signal is obtained, judging whether the opening value of the needle servomotor meets an opening state, if so, ending judgment, and if not, sending a first trigger signal to an emergency stop control unit; when the second digital switch signal is obtained, judging whether the opening value of the needle servomotor meets a closing state, if so, ending judgment, and if not, sending a second trigger signal to an emergency stop control unit;
And the emergency stop control unit is used for acquiring a first trigger signal and a second trigger signal from the processing unit, and sending a third digital switch signal to the first two-position three-way electromagnetic valve and the second two-position three-way electromagnetic valve when acquiring the first trigger signal or the second trigger signal, so as to control the first two-position three-way electromagnetic valve and the second two-position three-way electromagnetic valve to be electrically opened.
Furthermore, the upper computer is a singlechip or a PC.
The digital speed regulating system of the low-voltage generator set water turbine provided by the invention has at least the following beneficial effects or advantages:
the digital speed regulating system of the low-voltage generator set water turbine provided by the invention comprises the needle servomotor opening control unit formed by the first two-position two-way electromagnetic valve and the fourth two-position two-way electromagnetic valve and the needle servomotor closing control unit formed by the second two-position two-way electromagnetic valve and the third two-position two-way electromagnetic valve, so that the needle servomotor can be accurately opened and closed. According to the digital speed regulating system of the low-voltage generator set water turbine, the upper computer sends out digital or discrete control signals to control the action of the electromagnetic valve; the switch valve member only works in a full-open or full-closed state, and the multiple groups of switch valves can act in a single way or multiple ways, so that the slow or fast movement of the water guide mechanism is realized, and the discrete control of the flow is realized; the digital signal directly drives the valve member, so that the conversion links are few, and the action response is quick.
Drawings
Fig. 1 is a schematic structural diagram of a digital speed regulation system of a hydraulic turbine of a low-voltage generator set according to an embodiment of the present invention.
In the drawings, the list of components represented by the various numbers is as follows:
10-first two-position two-way electromagnetic valve, 20-second two-position two-way electromagnetic valve, 3-0 third two-position two-way electromagnetic valve, 40-fourth two-position two-way electromagnetic valve, 50-first two-position three-way electromagnetic valve, 60-second two-position three-way electromagnetic valve, 70-one-way throttle valve assembly, 701-first one-way valve, 702-first throttle valve, 703-second one-way valve, 704-second throttle valve, 80-needle servomotor, P0-third oil inlet box, P1-first oil inlet box, P2-second oil inlet box, T0-third oil return box, T1-first oil return box, T2-second oil return box, open cavity of O-needle servomotor and closed cavity of C-needle servomotor.
Detailed Description
Aiming at the technical problems that a water guide mechanism of a water turbine of a low-voltage generator set is driven by a screw rod driven by a motor in the prior art, the invention has small operation work, low action speed, low positioning precision and incapability of rapidly closing the water guide mechanism under the condition of power failure, the invention provides a digital speed regulation system of the water turbine of the low-voltage generator set.
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, an embodiment of the present invention provides a digital speed regulation system for a hydraulic turbine of a low-voltage generator set, including: the upper computer, the first two-position two-way electromagnetic valve 10, the second two-position two-way electromagnetic valve 20, the third two-position two-way electromagnetic valve 30, the fourth two-position two-way electromagnetic valve 40, the one-way throttle valve assembly 70, the needle servomotor 80, the oil inlet tank and the oil return tank. The one-way throttle valve assembly 70 includes: a first valve block and a second valve block; the first valve group includes a first check valve 701 and a first throttle valve 702 connected in parallel; the second valve group comprises a second check valve 703 and a second throttle valve 704 connected in parallel.
The first oil inlet box P1 is connected with an A port of a first two-position two-way electromagnetic valve 10, the A1 port of the first two-position two-way electromagnetic valve 10 is connected with a forward end of a first valve bank, and a reverse end of the first valve bank is connected with an opening cavity O of the needle servomotor; the first oil return tank T1 is connected with an A port of the second two-position two-way electromagnetic valve 20, and an A1 port of the second two-position two-way electromagnetic valve 20 is connected with the forward end of the first valve group. The forward end of the first valve bank is a position where the inlet end of the first check valve 701 is connected, and the reverse end of the first valve bank is a position where the outlet end of the first check valve 701 is connected.
The second oil inlet box P2 is connected with an A port of a third two-position two-way electromagnetic valve 30, an A1 port of the third two-position two-way electromagnetic valve 30 is connected with a forward end of a second valve group, and a reverse end of the second valve group is connected with a closed cavity C of the needle servomotor. The second oil return tank T2 is connected with an A port of the fourth two-position two-way electromagnetic valve 40, and an A1 port of the fourth two-position two-way electromagnetic valve 40 is connected with the forward end of the second valve group. Wherein, the forward end of the second valve group is the position where the inlet end of the second check valve 703 is connected, and the reverse end of the second valve group is the position where the outlet end of the second check valve 703 is connected.
The upper computer is respectively and electrically connected with the first two-position two-way electromagnetic valve 10, the second two-position two-way electromagnetic valve 20, the third two-position two-way electromagnetic valve 30 and the fourth two-position two-way electromagnetic valve 40; the upper computer sends out digital or discrete control signals to control the action of the electromagnetic valve. Wherein, the upper computer is a singlechip or a PC.
In a preferred embodiment provided by the present invention, referring to fig. 1, the digital speed regulation system of the hydraulic turbine of the low-voltage generator set further includes: a first two-position three-way electromagnetic valve 50, a second two-position three-way electromagnetic valve 60, a third oil inlet tank P0, a third oil return tank and an opening sensor. The A1 port of the first two-position two-way electromagnetic valve 10 is connected with the B port of the first two-position three-way electromagnetic valve 50, and the B1 port of the first two-position three-way electromagnetic valve 50 is connected with the forward end of the first valve group. The port A1 of the fourth two-position two-way electromagnetic valve 40 is connected with the port B of the second two-position three-way electromagnetic valve 60, and the port B1 of the second two-position three-way electromagnetic valve 60 is connected with the forward end of the second valve group. The port A of the first two-position three-way electromagnetic valve 50 is connected with a third oil return tank, and the port A of the second two-position three-way electromagnetic valve 60 is connected with a third oil inlet tank P0. The opening sensor is arranged inside the needle servomotor 80 and is used for detecting the opening and closing degree of the needle servomotor 80; the opening sensor is electrically connected with the upper computer; the first two-position three-way electromagnetic valve 50 and the second two-position three-way electromagnetic valve 60 are electrically connected with the upper computer respectively.
Wherein, the host computer includes: the system comprises a signal acquisition unit, an opening control unit, a closing control unit, a processing unit and an emergency stop control unit. Specific:
the signal acquisition unit is used for acquiring the opening and closing degree signal of the needle servomotor 80 uploaded by the opening sensor.
The opening control unit is used for sending a first digital switching signal to the first two-position two-way electromagnetic valve 10 and the fourth two-position two-way electromagnetic valve 40, and controlling the first two-position two-way electromagnetic valve 10 and the fourth two-position two-way electromagnetic valve 40 to be electrically opened.
The closing control unit is configured to send a second digital switching signal to the second two-position two-way electromagnetic valve 20 and the third two-position two-way electromagnetic valve 30, and control the second two-position two-way electromagnetic valve 20 and the third two-position two-way electromagnetic valve 30 to be electrically opened.
The processing unit is used for acquiring an opening and closing degree signal of the needle servomotor 80 from the signal acquisition unit and processing to obtain an opening value of the needle servomotor 80; acquiring the first digital switching signal from an opening control unit; the second digital switching signal is obtained from the closing control unit. When the first digital switching signal is acquired, whether the opening value of the needle servomotor 80 meets the opening state is judged, if yes, the judgment is ended, and if not, a first trigger signal is sent to the scram control unit. When the second digital switching signal is acquired, whether the opening value of the needle servomotor 80 meets the closing state is judged, if yes, the judgment is ended, and if not, a second trigger signal is sent to the scram control unit.
The emergency stop control unit is configured to obtain the first trigger signal and the second trigger signal from the processing unit, and send a third digital switching signal to the first two-position three-way electromagnetic valve 50 and the second two-position three-way electromagnetic valve 60 when obtaining the first trigger signal or the second trigger signal, so as to control the first two-position three-way electromagnetic valve 50 and the second two-position three-way electromagnetic valve 60 to be electrically opened.
The working process of the digital speed regulating system of the low-voltage generator set water turbine provided by the embodiment of the invention is as follows: referring to fig. 1, each switching valve has a solenoid to control its opening or closing. The first two-position two-way solenoid valve 10 and the second two-position two-way solenoid valve 20 control the open cavity of the needle servomotor 80, and the third two-position two-way solenoid valve 30 and the fourth two-position two-way solenoid valve 40 control the closed cavity of the needle servomotor 80. The one-way throttle valve serves to limit the fastest closing speed of needle relay 80. The first two-position three-way electromagnetic valve 50 and the second two-position three-way electromagnetic valve 60 control the needle relay 80 to be quickly closed when any one or more of the first two-position two-way electromagnetic valve 10, the second two-position two-way electromagnetic valve 20, the third two-position two-way electromagnetic valve 30 and the fourth two-position two-way electromagnetic valve 40 fails. When the needle servomotor 80 is required to be started, the upper computer sends out a digital signal, the electromagnetic coil of the first two-position two-way electromagnetic valve 10 is powered on, the first two-position two-way electromagnetic valve 10 is started, and pressure oil is connected into the needle servomotor 80 to open a cavity; the coil of the fourth two-position two-way electromagnetic valve 40 is electrified, the fourth two-position two-way electromagnetic valve 40 is opened, and the closing cavity of the needle servomotor 80 is communicated with oil return; needle relay 80 opens under hydraulic pressure. When the needle servomotor 80 is required to be closed, the upper computer sends out a digital signal, the third two-position two-way electromagnetic coil is powered on, the third two-position two-way electromagnetic valve 30 is opened, and pressure oil is connected into the needle servomotor 80 to close a cavity; the electromagnetic coil of the second two-position two-way electromagnetic valve 20 is electrified, the second two-position two-way electromagnetic valve 20 is opened, and the spray needle servomotor 80 is opened and communicated with oil return; needle relay 80 is closed under hydraulic pressure. When all the switching valves are powered off, the servomotor is kept at the current position. When the needle servomotor 80 is required to be closed quickly, the upper computer sends out a digital signal, the electromagnetic coil of the second two-position three-way electromagnetic valve 60 is electrified, the second two-position three-way electromagnetic valve 60 is opened, and pressure oil is connected into a closing cavity of the needle servomotor; the electromagnetic coil of the first two-position three-way electromagnetic valve 50 is powered on, the first two-position three-way electromagnetic valve 50 is opened, and the spray needle servomotor 80 is opened and communicated with oil return; needle relay 80 is rapidly closed under hydraulic force.
The upper computer thyristor adopted by the digital speed regulating system of the hydraulic turbine of the low-voltage generator set is far higher than the action response time of a digital valve, and the program control generally enables the upper computer thyristor to work at 5 to 20 ms.
The digital speed regulating system of the low-voltage generator set water turbine provided by the embodiment of the invention has at least the following beneficial effects or advantages:
The digital speed regulating system of the low-voltage generator set water turbine provided by the embodiment of the invention comprises the needle servomotor opening control unit formed by the first two-position two-way electromagnetic valve and the fourth two-position two-way electromagnetic valve and the needle servomotor closing control unit formed by the second two-position two-way electromagnetic valve and the third two-position two-way electromagnetic valve, so that the needle servomotor can be accurately opened and closed. According to the digital speed regulating system of the low-voltage generator set water turbine, the upper computer sends out digital or discrete control signals to control the action of the electromagnetic valve; the switch valve member only works in a full-open or full-closed state, and the multiple groups of switch valves can act in a single way or multiple ways, so that the slow or fast movement of the water guide mechanism is realized, and the discrete control of the flow is realized; the digital signal directly drives the valve member, so that the conversion links are few, and the action response is quick.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (4)
1. A digital speed regulation system for a low voltage generator set hydraulic turbine, comprising: the device comprises an upper computer, a first two-position two-way electromagnetic valve (10), a second two-position two-way electromagnetic valve (20), a third two-position two-way electromagnetic valve (30), a fourth two-position two-way electromagnetic valve (40), a one-way throttle valve assembly (70), a spray needle servomotor (80), an oil inlet tank, an oil return tank, a first two-position three-way electromagnetic valve (50), a second two-position three-way electromagnetic valve (60), a third oil inlet tank (P0) and a third oil return tank (T0);
The one-way throttle valve assembly (70) includes: a first valve block and a second valve block; the first valve group comprises a first check valve (701) and a first throttle valve (702) which are connected in parallel; the second valve group comprises a second check valve (703) and a second throttle valve (704) which are connected in parallel;
The oil inlet box is connected with an A port of the first two-position two-way electromagnetic valve (10), an A1 port of the first two-position two-way electromagnetic valve (10) is connected with a forward end of a first valve group, and a reverse end of the first valve group is connected with an opening cavity (O) of the needle servomotor; the oil return tank is connected with an A port of the second two-position two-way electromagnetic valve (20), and an A1 port of the second two-position two-way electromagnetic valve (20) is connected with the forward end of the first valve group;
The oil inlet box is connected with an A port of the third two-position two-way electromagnetic valve (30), an A1 port of the third two-position two-way electromagnetic valve (30) is connected with the forward end of the second valve group, and the reverse end of the second valve group is connected with the closed cavity (C) of the needle servomotor; the oil return tank is connected with an A port of the fourth two-position two-way electromagnetic valve (40), and an A1 port of the fourth two-position two-way electromagnetic valve (40) is connected with the forward end of the second valve group;
The upper computer is respectively and electrically connected with the first two-position two-way electromagnetic valve (10), the second two-position two-way electromagnetic valve (20), the third two-position two-way electromagnetic valve (30) and the fourth two-position two-way electromagnetic valve (40), and the upper computer sends out digital or discrete control signals to control the action of the electromagnetic valve;
the oil inlet box includes: the first oil inlet box (P1) and the second oil inlet box (P2); the oil return box comprises: a first oil return tank (T1) and a second oil return tank (T2);
the first oil inlet box (P1) is connected with an A port of the first two-position two-way electromagnetic valve (10); the first oil return tank (T1) is connected with an A port of the second two-position two-way electromagnetic valve (20);
the second oil inlet box (P2) is connected with an A port of the third two-position two-way electromagnetic valve (30); the second oil return tank (T2) is connected with an A port of the fourth two-position two-way electromagnetic valve (40);
The port A1 of the first two-position two-way electromagnetic valve (10) is connected with the port B of the first two-position three-way electromagnetic valve (50), and the port B1 of the first two-position three-way electromagnetic valve (50) is connected with the forward end of the first valve group;
the port A1 of the fourth two-position two-way electromagnetic valve (40) is connected with the port B of the second two-position three-way electromagnetic valve (60), and the port B1 of the second two-position three-way electromagnetic valve (60) is connected with the forward end of the second valve group;
an A port of the first two-position three-way electromagnetic valve (50) is connected with the third oil return tank (T0); an A port of the second two-position three-way electromagnetic valve (60) is connected with the third oil inlet box (P0).
2. The digital governor system of a low-voltage genset turbine of claim 1, further comprising: an opening sensor;
The opening sensor is arranged in the needle servomotor (80) and is used for detecting the opening and closing degree of the needle servomotor (80); the opening sensor is electrically connected with the upper computer;
The first two-position three-way electromagnetic valve (50) and the second two-position three-way electromagnetic valve (60) are respectively electrically connected with the upper computer.
3. The digital speed regulation system of a low voltage generator set hydraulic turbine according to claim 2, wherein the upper computer comprises:
a signal acquisition unit for acquiring an opening degree signal of the needle servomotor (80) uploaded by the opening degree sensor;
the opening control unit sends a first digital switching signal to the first two-position two-way electromagnetic valve (10) and the fourth two-position two-way electromagnetic valve (40) to control the first two-position two-way electromagnetic valve (10) and the fourth two-position two-way electromagnetic valve (40) to be electrically opened;
the closing control unit sends a second digital switch signal to the second two-position two-way electromagnetic valve (20) and the third two-position two-way electromagnetic valve (30) to control the second two-position two-way electromagnetic valve (20) and the third two-position two-way electromagnetic valve (30) to be electrically opened;
The processing unit is used for acquiring an opening degree signal of the needle servomotor (80) from the signal acquisition unit and processing the opening degree signal to obtain an opening degree value of the needle servomotor (80); acquiring the first digital switching signal from the opening control unit and acquiring the second digital switching signal from the closing control unit; when the first digital switch signal is obtained, judging whether the opening value of the needle servomotor (80) meets an opening state, if yes, ending the judgment, and if not, sending a first trigger signal to an emergency stop control unit; when the second digital switch signal is obtained, judging whether the opening value of the needle servomotor (80) meets the closing state, if so, ending the judgment, and if not, sending a second trigger signal to an emergency stop control unit;
And the emergency stop control unit is used for sending a third digital switch signal to the first two-position three-way electromagnetic valve (50) and the second two-position three-way electromagnetic valve (60) when the first trigger signal and the second trigger signal are acquired from the processing unit and the first trigger signal or the second trigger signal are acquired, so as to control the first two-position three-way electromagnetic valve (50) and the second two-position three-way electromagnetic valve (60) to be electrically opened.
4. The digital speed regulating system of the low-voltage generator set water turbine according to any one of claims 1 to 3, wherein the upper computer is a single chip microcomputer or a Personal Computer (PC).
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| CN104895736B (en) * | 2014-12-31 | 2017-03-08 | 武汉四创自动控制技术有限责任公司 | Impulse turbine intelligence control system |
| CN108119296A (en) * | 2016-11-29 | 2018-06-05 | 沈阳格泰水电设备有限公司 | A kind of impulse turbine governing system |
| CN109253042A (en) * | 2018-11-23 | 2019-01-22 | 天津市科音自控设备有限公司 | A kind of redundance type hydrogovernor |
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