CN220336956U - Control oil circuit - Google Patents
Control oil circuit Download PDFInfo
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- CN220336956U CN220336956U CN202321455338.7U CN202321455338U CN220336956U CN 220336956 U CN220336956 U CN 220336956U CN 202321455338 U CN202321455338 U CN 202321455338U CN 220336956 U CN220336956 U CN 220336956U
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- way
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- 238000002955 isolation Methods 0.000 claims abstract description 21
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 7
- 230000000903 blocking effect Effects 0.000 abstract description 9
- 238000004891 communication Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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- Control Of Turbines (AREA)
Abstract
The utility model discloses a control oil way, wherein safety oil is introduced into a safety oil pipe; the pressure oil pipe is filled with pressure oil, and the pressure oil pipe is connected with the safety oil pipe through a restrictor; the oil return pipe is communicated with the air inlet valve, a first valve is arranged on the first branch oil way, and a third valve is arranged on the second branch oil way; the third oil way is provided with a second valve, a bottom interface and a side interface of the unloading valve are both connected with an oil return pipe, and a pipe section of the oil return pipe between the bottom interface and the side interface is provided with a restrictor; the connection point of the isolation oil way and the first branch oil way is positioned at the upstream of the first valve, the connection point of the isolation oil way and the third branch oil way is positioned at the downstream of the second valve, and a fourth valve for controlling whether the isolation oil way is in a passage state or not is arranged on the isolation oil way; the novel technical scheme of on-line replacement of the blocking solenoid valve and blocking protection still can be carried out when the solenoid valve is replaced is realized, and the possible risk of the steam turbine during replacement of the solenoid valve is greatly avoided or even stopped.
Description
Technical Field
The utility model relates to a control oil way, and belongs to the technical field of control oil ways.
Background
The emergency shutdown system is capable of monitoring certain operating parameters of the turbine and automatically and rapidly closing all of the turbine steam admission valves when those parameters exceed their operating limits. Preventing the steam turbine from serious damage accident. For example, in the east vapor fire-resistant oil control system, four shutoff solenoid valves are arranged in an AST module, and the reliability of brake-off control is ensured by a redundancy design mode. The system can automatically jump when the solenoid valves at the opposite angles fail at the same time, and the system adopts a redundant mode, but the blocking solenoid valve is a key element in the blocking system, so that the solenoid valve loses function due to long-term electrification, abrasion, blocking and failure, and the solenoid valve must be stopped and replaced as soon as possible according to the operation requirement. However, in the existing critical interruption system, the electromagnetic valve needs to be stopped first and then can be replaced, which may cause the risk of running steam turbine due to the stop of the critical interruption system.
The utility model provides a control oil way, which realizes a novel technical proposal of on-line replacement of an interruption solenoid valve and interruption protection when the solenoid valve is replaced, and greatly avoids or even eliminates the possible risk of a steam turbine when the solenoid valve is replaced.
Disclosure of Invention
The technical problems to be solved by the utility model are as follows: the technical problem that the electromagnetic valve can be replaced after the control oil way is stopped is solved.
The technical problems to be solved by the utility model are realized by adopting the following technical scheme:
scheme one: a control oil path comprises
The safety oil pipe is internally provided with safety oil;
the pressure oil pipe is internally filled with pressure oil, and the pressure oil pipe is connected with the safety oil pipe through a restrictor;
an oil drain pipe;
the oil return pipe is communicated with the air inlet valve, and safety oil circulates in the oil return pipe;
the electromagnetic valve is characterized in that a first valve is arranged on a first branch oil way of a pressure oil port of the electromagnetic valve, which is connected with a pressure oil pipe, and a third valve is arranged on a second branch oil way of an oil drain port of the electromagnetic valve, which is connected with the oil drain pipe;
the unloading valve is characterized in that a second valve is arranged on a third oil way, wherein a working oil port of the electromagnetic valve is connected with a top interface of the unloading valve, a bottom interface and a side interface of the unloading valve are both connected with an oil return pipe, and a throttle is arranged on a pipe section, positioned between the bottom interface and the side interface, of the oil return pipe;
the isolation oil way is communicated with the first oil way and the third oil way, the connection point of the isolation oil way and the first oil way is positioned at the upstream of the first valve, the connection point of the isolation oil way and the third oil way is positioned at the downstream of the second valve, and a fourth valve for controlling whether the isolation oil way is in a passage state or not is arranged on the isolation oil way.
The scheme provides a control oil way, realizes on-line replacement of the blocking solenoid valve and can still carry out the novel technical proposal of blocking protection when the solenoid valve is replaced, and greatly avoids or even avoids the possible occurrence risk of the steam turbine when the solenoid valve is replaced.
Scheme two, based on scheme one, in order to ensure that first valve, second valve and third valve are thoroughly closed, when avoiding online dismantlement solenoid valve, take place to reveal, set up a plurality of manometers, specifically do:
preferably, a pressure oil port of the electromagnetic valve is provided with an oil pressure gauge for measuring the pressure oil port. The pressure gauge is used for detecting the oil pressure of the pressure oil port, and when the pressure gauge number is zero, the first valve is completely closed.
Preferably, a pressure gauge for measuring the oil pressure of the working oil port is arranged at the working oil port of the electromagnetic valve. The pressure gauge is used for detecting the oil pressure of the working oil port, and when the pressure gauge number is zero, the second valve is completely closed.
Preferably, a pressure gauge for measuring oil pressure of the oil drain port is arranged at the oil drain port of the electromagnetic valve. The pressure gauge is used for detecting the oil pressure of the oil drain port, and when the pressure gauge number is zero, the third valve is completely closed.
Through the joint work of the three pressure gauges, the first valve, the second valve and the third valve can be ensured to be completely closed, the failure electromagnetic valve can be safely disassembled, and no leakage is ensured.
The beneficial effects of the utility model are as follows:
the novel technical scheme of on-line replacement of the blocking solenoid valve and blocking protection still can be carried out when the solenoid valve is replaced is realized, and the possible risk of the steam turbine during replacement of the solenoid valve is greatly avoided or even stopped.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is an enlarged schematic view of the structure A in FIG. 1;
in the figure: 1. an electromagnetic valve; 101. a pressure oil port; 102. a working oil port; 103. an oil drain port; 2. a first valve; 3. a second valve; 4. a third valve; 5. isolating the oil way; 6. a fourth valve; 7. an unloading valve; 701. a top interface; 702. a bottom interface; 703. a side interface; 8. a pressure gauge; 9. a pressure oil pipe; 10. a safety oil pipe; 11. an oil drain pipe; 12. an oil return pipe; 13. a steam inlet valve; 14. a throttle; 15. a first branch oil path; 16. a second branch oil path; 17. and a third oil path.
Detailed Description
The utility model will be further described with reference to the following embodiments in order to make the technical means, the creation features, the achievement of the objects and the effects of the utility model easy to understand.
In the description of the present utility model, it should be understood that the terms "transverse", "longitudinal", "end", "edge", "side wall", "upper", "lower", "directly above", "surface", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "end", "head", "tail", etc. refer to the orientation or positional relationship based on the drawings, are merely for convenience of describing the technical solution of the present utility model and for simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
As shown in fig. 1 and 2, the present embodiment provides a control oil passage,
a safety oil pipe 10, wherein safety oil is introduced into the safety oil pipe 10;
a pressure oil pipe 9, wherein pressure oil (pressure oil is also called high pressure oil, and is uniformly called pressure oil in the text) is introduced into the pressure oil pipe 9, and the pressure oil pipe 9 is connected with a safety oil pipe 10 through a restrictor 14; the pressure oil is depressurized through the restrictor 14 and is called a safety oil (safety oil is also called AST oil, and is herein referred to as safety oil).
An oil discharge pipe 11;
the oil return pipe 12 is communicated with the safety oil pipe 10, and safety oil flows in the oil return pipe 12; the oil return pipe 12 communicates with the intake valve,
the electromagnetic valve 1 is characterized in that a first valve 2 is arranged on a first branch oil way 15, wherein a pressure oil port 101 of the electromagnetic valve 1 is connected with a pressure oil pipe 9, and a third valve 4 is arranged on a second branch oil way 16, wherein an oil drain port 103 of the electromagnetic valve 1 is connected with an oil drain pipe 11;
the unloading valve 7, a second valve 3 is arranged on a third branch oil way 17, wherein the working oil port 102 of the electromagnetic valve 1 is connected with a top interface 701 of the unloading valve 7, a bottom interface 702 and a side interface 703 of the unloading valve 7 are both connected with an oil return pipe 12, and a restrictor 14 is arranged on a pipe section of the oil return pipe 12, which is positioned between the bottom interface 702 and the side interface 703; the electromagnetic valve 1 and the unloading valve 7 are in one-to-one correspondence to realize working coordination;
in specific implementation, four sets of electromagnetic valves 1 and four sets of unloading valves 7 can be arranged, and a pair of throttles 14 are arranged on the oil return pipe 12 in a matched manner; the bottom interfaces 702 of a pair of unloading valves 7 are each located upstream of a throttle valve, and the side interfaces 703 of the pair of unloading valves 7 are each located downstream of the throttle valve. The pair of unloading valves 7 is also called a diagonal unloading valve 7, and the pair of solenoid valves 1 that cooperate with the diagonal unloading valve 7 is called a diagonal solenoid valve 1.
Similarly, the bottom ports 702 of the remaining pair of unloading valves 7 are each located upstream of the other throttle valve, and the side ports 703 of the remaining pair of unloading valves 7 are each located downstream of the other throttle valve. The remaining pair of unloading valves 7 is also referred to as a diagonal unloading valve 7, and the pair of solenoid valves 1 that cooperate with the diagonal unloading valve 7 is also referred to as a diagonal solenoid valve 1.
The isolation oil way 5 is communicated with the first branch oil way 15 and the third branch oil way 17, the connection point of the isolation oil way 5 and the first branch oil way 15 is positioned at the upstream of the first valve 2, the connection point of the isolation oil way 5 and the third branch oil way 17 is positioned at the downstream of the second valve 3, and the isolation oil way 5 is provided with a fourth valve 6 for controlling whether the isolation oil way 5 is in a passage state or not;
upstream of the first valve 2 is a flow direction based on the flow of pressure oil from the first branch into the solenoid valve 1.
Downstream of the second valve 3 is a flow direction based on the flow of pressure oil from the third branch into the unloading valve 7.
The working technology principle is as follows:
1. when the electromagnetic valve 1 does not need to be replaced, the first valve 2, the second valve 3 and the third valve 4 are opened, and the fourth valve 6 is closed;
(1.1) in normal operation, the four solenoid valves 1 in fig. 1 are all charged. Under the action of an energizing coil of the electromagnetic valve 1, the pressure oil port 101 is kept communicated with the working oil port 102, and the oil drain port 103 is closed; at this time, the pressure oil enters the unloading valve 7; after the pressure oil enters the unloading valve 7, the communication between the bottom port 702 and the side port of the unloading valve 7 is blocked.
The safety oil in the return line 12 cannot pass through the relief valve 7 and can only flow through the restrictor 14, so that the pressure of the safety oil increases under the action of the restrictor 14, i.e. the safety oil is pressurized.
(1.2) when the rotating speed of the steam turbine reaches 110%, ETS110% is subjected to electric overspeed protection, the electromagnetic valve 1 is powered off, the pressure oil port 101 and the oil drain port 103 are communicated under the action of an electrified coil of the electromagnetic valve 1, and the working oil port 102 is closed; the pressure oil flows into the electromagnetic valve 1 through the pressure oil pipe 9 and the pressure oil port 101 and then flows into the oil drain pipe 11 through the oil drain port 103, at this time, the top of the unloading valve 7 is not provided with oil pressure, the bottom interface 702 and the side interface of the unloading valve 7 are communicated, the safety oil is discharged from the oil return pipe 12 through the bottom interface 702 and the side interface of the unloading valve 7, the safety oil pressure is discharged, and accordingly the steam inlet valve 13 is closed (the steam inlet valve 13 is hydraulically driven, after the safety oil is pressurized, the steam inlet valve 13 is kept in an open state, and after the safety oil is depressurized, the steam inlet valve 13 is restored to a closed state), and meanwhile, the generator is disconnected, and the generator is stopped, and when the crisis is interrupted and triggered.
Meanwhile, pressure oil in the unloading valve 7 flows into an oil return pipe 12 through a bottom interface 702 and a side interface of the unloading valve 7 to realize pressure relief; after the pressure relief is finished, the bottom interface 702 and the side interface of the unloading valve 7 are restored to be in a communicated state, the energizing condition of the electromagnetic valve 1 is changed again, and the state of the electromagnetic valve 1 that the pressure oil port 101 and the oil drain port 103 are kept open and the working oil port 102 is closed is returned.
2. When the electromagnetic valve 1 needs to be replaced:
first, the first valve 2, the second valve 3 and the third valve 4 are closed, and then the fourth valve 6 is opened; the pressure oil enters the isolation oil way 5 and is connected with the unloading valve 7, and after the pressure oil enters the unloading valve 7, the communication between the bottom interface 702 and the side interface of the unloading valve 7 is blocked, so that the function of locking and compressing the unloading valve 7 is achieved. If the residual solenoid valve 1 is powered off at this time, the diagonal solenoid valve 1 and the unloading valve 7 work cooperatively, so that the safety oil pressure can be ensured to be unloaded, and the normal operation of the whole shutoff module function is realized.
At this time, the pressure oil port 101, the working oil port 102 and the oil drain port 103 of the electromagnetic valve 1 are not communicated with an oil path, so that the electromagnetic valve 1 is isolated, and the electromagnetic valve 1 can be disassembled on line.
The embodiment provides a control oil circuit, has realized on-line replacement shutoff solenoid valve 1 and still can carry out the novel technological improvement scheme of shutoff protection when changing solenoid valve 1, has greatly avoided even stopped the risk that the steam turbine probably takes place when changing solenoid valve 1.
In other embodiments, a pressure gauge 8 is provided at each of the pressure port 101, the working port 102 and the drain port 103 of the solenoid valve 1 to detect whether there is oil pressure inside the pressure port 101, the working port 102 and the drain port 103. In actual operation, there may be an operation error of closing the first valve 2, the second valve 3 and the third valve 4, which is not completely closed, and at this time, there is still oil pressure at the interface corresponding to the valve which is not completely closed, and the disassembly of the solenoid valve 1 may cause oil leakage. Therefore, when the numbers of the pressure gauges 8 at the pressure oil port 101, the working oil port 102 and the oil drain port 103 are zero, it is indicated that the first valve 2, the second valve 3 and the third valve 4 are completely closed, and the electromagnetic valve 1 can be disassembled. The pressure gauge 8 is arranged at the positions of the pressure oil port 101, the working oil port 102 and the oil drain port 103 of the electromagnetic valve 1, and the actual isolation condition of an oil way is verified through the on-line monitoring of related oil ways, so that the system is ensured to be completely replaced according to the requirement of design performance. When the solenoid valve 1 is detached, no leakage is ensured.
The leakage test of the pressure oil port 101, the working oil port 102 and the oil drain port 103 is carried out by adopting a model Nvo-20-A-O-V product provided by Hydroforce; the maximum leakage amount is as follows: 0.25ml/min at 25 MPa;
through actual measurement; after the pressure oil port 101, the working oil port 102 and the oil drain port 103 are isolated, the oil way can be completely cut off, and the pressure oil port 101, the working oil port 102 and the oil drain port 103 have zero leakage. And during the on-line replacement of the solenoid valve 1: AST hydraulic pressure energy is continuously maintained and does not drop.
The above-described "first valve 2", "second valve 3", "third valve 4" and "fourth valve 6" all employ existing valves that can and only aim to switch the oil passage between the communicating or closed states.
The "pressure gauge 8" described above employs an existing pressure gauge 8 capable of measuring oil pressure.
The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be appreciated by persons skilled in the art that the present utility model is not limited to the embodiments described above, but is capable of numerous variations and modifications without departing from the spirit and scope of the utility model as hereinafter claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (4)
1. A control oil path is characterized by comprising
The safety oil pipe is internally provided with safety oil;
the pressure oil pipe is internally filled with pressure oil, and the pressure oil pipe is connected with the safety oil pipe through a restrictor;
an oil drain pipe;
the oil return pipe is communicated with the air inlet valve, and safety oil circulates in the oil return pipe;
the electromagnetic valve is characterized in that a first valve is arranged on a first branch oil way of a pressure oil port of the electromagnetic valve, which is connected with a pressure oil pipe, and a third valve is arranged on a second branch oil way of an oil drain port of the electromagnetic valve, which is connected with the oil drain pipe;
the unloading valve is characterized in that a second valve is arranged on a third oil way, wherein a working oil port of the electromagnetic valve is connected with a top interface of the unloading valve, a bottom interface and a side interface of the unloading valve are both connected with an oil return pipe, and a throttle is arranged on a pipe section, positioned between the bottom interface and the side interface, of the oil return pipe;
the isolation oil way is communicated with the first oil way and the third oil way, the connection point of the isolation oil way and the first oil way is positioned at the upstream of the first valve, the connection point of the isolation oil way and the third oil way is positioned at the downstream of the second valve, and a fourth valve for controlling whether the isolation oil way is in a passage state or not is arranged on the isolation oil way.
2. The control oil passage according to claim 1, characterized in that a pressure gauge for measuring the pressure of the pressure port oil is provided at the pressure port of the solenoid valve.
3. The control oil passage according to claim 1, characterized in that a pressure gauge for measuring the oil pressure of the working oil port is provided at the working oil port of the solenoid valve.
4. The control oil passage according to claim 1, characterized in that a pressure gauge for measuring oil pressure of the oil drain port is provided at the oil drain port of the solenoid valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321455338.7U CN220336956U (en) | 2023-06-08 | 2023-06-08 | Control oil circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321455338.7U CN220336956U (en) | 2023-06-08 | 2023-06-08 | Control oil circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220336956U true CN220336956U (en) | 2024-01-12 |
Family
ID=89459641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321455338.7U Active CN220336956U (en) | 2023-06-08 | 2023-06-08 | Control oil circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220336956U (en) |
-
2023
- 2023-06-08 CN CN202321455338.7U patent/CN220336956U/en active Active
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