An on-line test protection device for high pressure bypass valve of power plant

Abstract

The utility model relates to bypass valve technical field, and disclose a kind of power plant high pressure bypass valve on-line test protection device, one end of proportional valve is fixedly installed with oil pipe, the one end of oil pipe away from proportional valve is fixedly installed with filter box, the one end of filter box away from oil pipe is fixedly installed with oil inlet pipe, the other end of proportional valve is fixedly installed with main pipe, the one end of main pipe away from proportional valve is fixedly installed with output pipe one and output pipe two, the one end of output pipe one and output pipe two away from main pipe is fixedly installed with instrument valve, the other end of two groups of instrument valve is fixedly installed with pressure transmitter, the other end of pressure transmitter being communicated with output pipe one is fixedly installed with connecting pipe, the inside of connecting pipe is provided with electromagnetic ball valve;Can be through regular on-line test to promote proportional valve spool action, avoid the problem of jamming caused by impurity accumulation, without operating personnel on-site manual operation, ensure that unit accident state can be opened high bypass valve remotely quickly, improve operation safety and reliability.

Description

Technical Field

[0001] This utility model relates to the field of bypass valve technology, and in particular to an online test protection device for a high-pressure bypass valve in a power plant. Background Technology

[0002] High-pressure bypass valves, also known as high-pressure bypass valves, are key regulating and protection devices in thermal power units, nuclear power units, and other thermal systems. By installing them before the boiler superheater outlet and the turbine high-pressure cylinder inlet, they can effectively introduce the high-temperature and high-pressure steam from the boiler superheater outlet directly into the reheater or condenser after pressure reduction and cooling, thereby achieving unit start-up and shutdown regulation, load fluctuation adaptation, and safe pressure relief under fault conditions.

[0003] Its operating performance directly affects the unit's start-up and shutdown efficiency, operational stability, and equipment safety. It is a core component that ensures the dynamic balance of pressure and temperature parameters in the thermal system.

[0004] The high-pressure bypass valve is hydraulically driven. The valve's adjustment is operated by the proportional valve and quick-opening / quick-closing solenoid valve on the hydraulic cylinder actuator. During normal operation of the unit, the valve is always in the closed state.

[0005] However, the aforementioned and existing related technologies often have the following drawbacks: the proportional valve core on the actuator module is always in a fixed position. When it is stationary for a long time, impurities and sludge are easily accumulated. As a result, when the valve needs to be operated in an emergency, the proportional valve often gets stuck and cannot operate normally. As a result, the operator has to run to a higher platform to manually activate the proportional valve core on the high-voltage bypass valve cylinder with a solenoid coil before the high-voltage bypass valve can be opened. This cannot guarantee the remote and rapid operation of the high-voltage bypass valve in the event of a unit accident. Utility Model Content

[0006] The technical problem to be solved by this utility model is that the proportional valve in the prior art is prone to jamming and failure to operate normally due to the accumulation of impurities in the oil caused by being in a static state for a long time. To address this, we propose an online test protection device for high-pressure bypass valves in power plants.

[0007] To achieve the above objectives, this application adopts the following technical solution: an online test protection device for a high-pressure bypass valve in a power plant, comprising a proportional valve, an oil supply pipe fixedly installed at one end of the proportional valve, a filter box fixedly installed at the end of the oil supply pipe opposite to the proportional valve, an oil inlet pipe fixedly installed at the end of the filter box opposite to the oil supply pipe, a main pipe fixedly installed at the other end of the proportional valve, an output pipe one and an output pipe two fixedly installed at the end of the main pipe opposite to the proportional valve, an instrument valve fixedly installed at the end of both output pipe one and output pipe two opposite to the main pipe, a pressure transmitter fixedly installed at the other end of both instrument valves, a connecting pipe fixedly installed at the other end of the pressure transmitter connected to output pipe one, an electromagnetic ball valve provided inside the connecting pipe, and an output pipe three fixedly installed at the other end of the connecting pipe and the other end of the pressure transmitter connected to output pipe two.

[0008] Preferably, the other end of the output pipe three, which is connected to the output pipe two, is connected to the hydraulic cylinder execution module, and the other end of the output pipe three, which is connected to the output pipe one, is connected to the experimental pipeline module.

[0009] Preferably, a manual reversing valve is provided on the inner side of the connecting pipe. The manual reversing valve includes a rotary handle that is rotatably connected to the connecting pipe, and a valve is fixedly installed at the lower end of the rotary handle.

[0010] Preferably, the diameter of the valve is the same as the diameter of the inner wall of the connecting pipe, a rubber ring is fixedly sleeved on the outside of the valve, and a sealing ring groove is opened on the inner wall of the connecting pipe, with the rubber ring fitting and abutting against the sealing ring groove.

[0011] Preferably, filter plates are symmetrically slidably installed on the inner side of the filter box, and a pull handle is fixedly installed on the upper end of the filter plate.

[0012] Preferably, the upper end of the filter box is symmetrically provided with magnetic grooves, and magnets are symmetrically installed on the opposite sides of the two sets of filter plates, and the magnets are magnetically attracted to the magnetic grooves.

[0013] The technical effects and advantages of this utility model are as follows: without affecting the fast opening and fast closing function of the valve, the output value of the pressure transmitter connected to output pipe one and output pipe two is analyzed to determine whether the proportional valve can operate normally.

[0014] After the test is completed, the electromagnetic ball valve coil is de-energized, the electromagnetic ball valve position signal is disconnected, and the hydraulic system returns to normal. This allows the proportional valve core to move through periodic online testing, avoiding jamming caused by impurities. No manual operation by operators is required on-site, ensuring that the high-pressure bypass valve can be opened remotely and quickly in the event of a unit accident, thus improving operational safety and reliability. Attached Figure Description

[0015] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the overall structure of this utility model; Figure 3 This is a cross-sectional and exploded view of the connecting pipe structure of this utility model; Figure 4 This is an exploded view of the filter box structure of this utility model.

[0016] Legend: 1. Proportional valve; 2. Oil delivery pipe; 3. Filter box; 31. Filter plate; 32. Pull handle; 33. Magnet; 34. Magnetic groove; 4. Oil inlet pipe; 5. Main pipe; 51. Output pipe one; 52. Output pipe two; 6. Instrument valve; 7. Pressure transmitter; 8. Connecting pipe; 81. Solenoid ball valve; 82. Manual directional valve; 821. Turn handle; 822. Valve; 823. Rubber ring; 83. Sealing ring groove; 9. Output pipe three. Detailed Implementation

[0017] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0018] Because the proportional valve spool on the actuator module remains in a fixed position, impurities and sludge easily accumulate during prolonged periods of inactivity. This often leads to the proportional valve jamming and failing to operate properly in emergency situations. Operators then need to urgently run to a higher platform to manually activate the proportional valve spool on the high-pressure bypass valve cylinder using a solenoid coil. This prevents remote and rapid operation of the high-pressure bypass valve in case of unit failure. To address this issue, [the following is a proposed solution]. Figure 1 - Figure 3As shown, this utility model provides a technical solution: an online test protection device for a high-pressure bypass valve in a power plant, including a proportional valve 1, an oil supply pipe 2 fixedly installed at one end of the proportional valve 1, a filter box 3 fixedly installed at the end of the oil supply pipe 2 away from the proportional valve 1, an oil inlet pipe 4 fixedly installed at the end of the filter box 3 away from the oil supply pipe 2, a main pipe 5 fixedly installed at the other end of the proportional valve 1, an output pipe 1 51 and an output pipe 2 52 fixedly installed at the end of the main pipe 5 away from the proportional valve 1, an instrument valve 6 fixedly installed at the end of both the output pipe 1 51 and the output pipe 2 52 away from the main pipe 5, a pressure transmitter 7 fixedly installed at the other end of both instrument valves 6, a connecting pipe 8 fixedly installed at the other end of the pressure transmitter 7 connected to the output pipe 1 51, an electromagnetic ball valve 81 provided inside the connecting pipe 8, and an output pipe 3 9 fixedly installed at the other end of the connecting pipe 8 and the other end of the pressure transmitter 7 connected to the output pipe 2 52. The other end of the output pipe 9, which is connected to the output pipe 2 52, is connected to the hydraulic cylinder execution module, and the other end of the output pipe 9, which is connected to the output pipe 1 51, is connected to the experimental pipeline module. A manual directional valve 82 is installed inside the connecting pipe 8. The manual directional valve 82 includes a rotary handle 821 rotatably connected to the connecting pipe 8. A valve 822 is fixedly installed at the lower end of the rotary handle 821. During normal operation, rotating the rotary handle 821 drives the valve 822 to rotate, causing the manual directional valve 82 to be normally closed. At this time, the solenoid ball valve 81 is in a de-energized state, resulting in no position signal output from the solenoid ball valve 81 position feedback device. At this time, the oil circuit of the output pipe 52 connected to the proportional valve 1 is directly connected to the quick-opening solenoid valve. The hydraulic principle is no different from that before the modification, and the same switching and quick opening and closing can be achieved as before. When the proportional valve 1 controls the valve opening and closing, the pressure transmitter 7 will output data. When the valve is closed and fixed, the output signal of one set of pressure transmitters 7 is zero and constant. When it is necessary to test the performance of the proportional valve 1 online, the coil of the solenoid ball valve 81 is energized, and the solenoid ball valve 81... The position feedback device of valve 81 outputs a signal. The output pipe 51 connected to proportional valve 1 and the quick-opening solenoid valve are disconnected through the solenoid valve. At this time, any signal is given to the coil of proportional valve 1. The oil circuit of the quick-opening solenoid valve cannot be connected to the output pipe 52 of proportional valve. Therefore, the cylinder will not perform valve opening and closing actions, and it will not affect the quick opening and quick closing functions of the valve. Only the output value of the pressure transmitter 7 connected to the output pipe 51 and the output pipe 52 will change. The trend of the output value change is used to determine whether the proportional valve can operate normally. After the test is completed, the coil of solenoid ball valve 81 is de-energized, the position signal of solenoid ball valve 81 is disconnected, and the hydraulic system returns to normal. Thus, the valve core of proportional valve 1 can be made to move through periodic online tests, avoiding the jamming problem caused by the accumulation of impurities. No manual operation by the operator is required on site. This ensures that the high-pressure bypass valve can be opened remotely and quickly in the event of a unit accident, improving the safety and reliability of operation.

[0019] Reference Figure 3 As shown in this embodiment: the diameter of valve 822 is the same as the inner wall diameter of connecting pipe 8, a rubber ring 823 is fixedly sleeved on the outside of valve 822, and a sealing ring groove 83 is opened on the inner wall of connecting pipe 8. The rubber ring 823 and the sealing ring groove 83 fit together and abut against each other to form a reliable sealing structure, effectively preventing oil leakage in connecting pipe 8, ensuring the oil circuit sealing and pressure stability during normal operation and online testing of the device, and further improving the reliability of the device.

[0020] Reference Figure 4 As shown in this embodiment: filter plates 31 are symmetrically slidably installed on the inner side of the filter box 3, and a pull handle 32 is fixedly installed on the upper end of the filter plate 31. Before the oil enters the oil circuit, the filter plate 31 can effectively filter the impurities contained in the oil circuit, further avoiding the problem of valve core jamming of the proportional valve 1. After long-term use, the filter plate 31 can also be pulled out by the pull handle 32 for cleaning or replacement, ensuring the flow of the oil circuit.

[0021] Reference Figure 4 As shown in this embodiment: magnetic suction grooves 34 are symmetrically provided on the upper end of the filter box 3, and magnets 33 are symmetrically installed on the opposite sides of the two sets of filter plates 31. The magnets 33 and magnetic suction grooves 34 are magnetically attracted to each other. During the filtration process, the magnetic attraction between the magnets 33 and magnetic suction grooves 34 can effectively fix the filter plates 31 and ensure effective filtration.

[0022] Working Principle: During normal operation, rotating the handle 821 rotates the valve 822, causing the manual directional valve 82 to close normally. At this time, the solenoid ball valve 81 is de-energized, resulting in no position signal output from the solenoid ball valve 81 position feedback device. Furthermore, the oil circuit of the output pipe 52 connected to the proportional valve 1 is directly connected to the quick-opening solenoid valve. The hydraulic principle remains unchanged from before the modification, achieving the same switching and quick-opening / closing as the old principle. When the proportional valve 1 controls the valve opening and closing, the pressure transmitter 7 outputs data. When the valve is closed and fixed, one set of pressure transmitters 7 outputs a zero and constant signal. When online testing of the proportional valve 1's performance is required, the coil of the solenoid ball valve 81 is energized, and the solenoid ball valve 81 position feedback device outputs a signal. This signal is transmitted through the solenoid valve to the solenoid valve connected to the proportional valve 1. When output pipe 51 and the quick-opening solenoid valve are disconnected, any signal given to the coil of proportional valve 1 will prevent the oil circuit of the quick-opening solenoid valve from connecting with the output pipe 52 of the proportional valve. Therefore, the cylinder will not perform valve opening and closing actions, and the quick-opening and quick-closing functions of the valve will not be affected. Only the output value of the pressure transmitter 7 connected to output pipes 51 and 52 will change. The trend of the output value change is used to determine whether the proportional valve can operate normally. After the test is completed, the coil of the solenoid ball valve 81 is de-energized, the position signal of the solenoid ball valve 81 is disconnected, and the hydraulic system returns to normal. This allows the proportional valve 1 valve core to be activated through periodic online tests, avoiding jamming caused by impurities. No manual operation by operators is required on-site, ensuring that the high-pressure bypass valve can be opened remotely and quickly in the event of a unit accident, improving operational safety and reliability.

[0023] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. An online test protection device for a high-pressure bypass valve in a power plant, characterized in that, The system includes a proportional valve, with an oil supply pipe fixedly installed at one end of the proportional valve. A filter box is fixedly installed at the end of the oil supply pipe opposite to the proportional valve. An oil inlet pipe is fixedly installed at the end of the filter box opposite to the oil supply pipe. A main pipe is fixedly installed at the other end of the proportional valve. Output pipe one and output pipe two are fixedly installed at the end of the main pipe opposite to the proportional valve. Instrument valves are fixedly installed at the ends of output pipe one and output pipe two opposite to the main pipe. Pressure transmitters are fixedly installed at the other ends of both sets of instrument valves. A connecting pipe is fixedly installed at the other end of the pressure transmitter connected to output pipe one. An electromagnetic ball valve is provided inside the connecting pipe. Output pipe three is fixedly installed at the other end of the connecting pipe and at the other end of the pressure transmitter connected to output pipe two.

2. The online test protection device for high-pressure bypass valves in power plants according to claim 1, characterized in that: The other end of the output pipe three, which is connected to the output pipe two, is connected to the hydraulic cylinder execution module, and the other end of the output pipe three, which is connected to the output pipe one, is connected to the experimental pipeline module.

3. The online test protection device for high-pressure bypass valves in power plants according to claim 1, characterized in that: A manual reversing valve is provided on the inner side of the connecting pipe. The manual reversing valve includes a screw handle that is rotatably connected to the connecting pipe, and a valve is fixedly installed at the lower end of the screw handle.

4. The online test protection device for high-pressure bypass valves in power plants according to claim 3, characterized in that: The diameter of the valve is the same as the inner wall diameter of the connecting pipe. A rubber ring is fixedly fitted on the outside of the valve. A sealing ring groove is opened on the inner wall of the connecting pipe. The rubber ring fits and abuts against the sealing ring groove.

5. The online test protection device for high-pressure bypass valves in power plants according to claim 1, characterized in that: The filter box has filter plates symmetrically and slidably installed on its inner side, and a pull handle is fixedly installed on the upper end of the filter plates.

6. The online test protection device for high-pressure bypass valves in power plants according to claim 5, characterized in that: The filter box has symmetrical magnetic grooves at the top. Magnets are symmetrically installed on the opposite sides of the two sets of filter plates. The magnets are magnetically attracted to the magnetic grooves.

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