CN201155420Y - Hydraulic Turbine Accident Shutdown Device Based on Cartridge Valve - Google Patents

Abstract

The hydraulic turbine accident shutdown device based on the cartridge valve of the present invention includes a cartridge valve A and a cartridge valve B connected in parallel on the oil circuit of the reversing valve of the high oil pressure governor and the servomotor with the same diameter. Cartridge valve C and cartridge valve D on the servomotor also include an electromagnetic reversing valve. Cartridge valve A is connected in series on the oil circuit connecting the reversing valve of the high oil pressure governor and the starting chamber of the servomotor. Cartridge valve B It is connected in series on the oil circuit connecting the high oil pressure reversing valve and the shutdown cavity of the servomotor. The cartridge valve A and the cartridge valve B are connected to a port of the electromagnetic reversing valve through the oil circuit, and the cartridge valve C is connected to the shutdown chamber of the servomotor. The cartridge valve D is connected to the servomotor starting chamber and the oil return circuit, and the cartridge valve C and the cartridge valve D are connected to the other port of the electromagnetic reversing valve through the oil circuit. It is used as an emergency stop device when the high oil pressure governor is applied to a relatively large water turbine unit.

Description

Hydraulic Turbine Accident Shutdown Device Based on Cartridge Valve

technical field

The utility model belongs to the technical field of power equipment of a hydropower station, and relates to an accident shutdown device, in particular to a hydraulic turbine accident shutdown device based on a cartridge valve.

Background technique

The emergency shutdown device of the hydraulic turbine unit is a device used to close the guide vane when the emergency shutdown device of the turbine governor fails to achieve reliable emergency shutdown.

The existing hydraulic turbine emergency shutdown device is to install an emergency pressure distribution valve next to the turbine room. When the governor fails to operate, the emergency pressure distribution valve supplies oil to the servomotor and closes the guide vanes to realize reliable emergency shutdown. The emergency pressure distribution valve is used together with the low oil pressure governor, and has the same low pressure oil source. It needs a larger flow rate and a larger volume (similar to the diameter of the main pressure distribution valve of the governor) to achieve a certain operating power. The oil circuit of the emergency pressure distribution valve is connected in parallel with the oil circuit of the governor, and the diameter of the oil circuit is the same as that of the main pressure distribution valve. The on-site piping is complicated and it is not convenient for manual operation.

Recently, high oil pressure governors with higher pressure levels and hydraulic standard components have been successfully applied to small and medium-sized hydraulic turbines, and are developing towards larger hydraulic turbines. High oil pressure governors are used in relatively large units, and emergency shutdown devices need to be installed. Traditional emergency pressure distribution valves cannot meet the requirements of high oil pressure governors for emergency shutdown devices.

Contents of the invention

The purpose of the utility model is to provide a hydraulic turbine accident shutdown device based on a cartridge valve, which can be matched with a high oil pressure governor and applied to a relatively large hydraulic turbine unit to realize accident shutdown.

The technical scheme adopted by the utility model is, a hydraulic turbine accident shutdown device based on a cartridge valve, including a cartridge valve A, a cartridge valve A, a cartridge The valve B is connected in parallel with the servomotor start-up chamber and the cartridge valve C and the cartridge valve D in the start-up chamber, and also includes an electromagnetic reversing valve. Cartridge valve A is connected in series on the oil circuit connecting the reversing valve of the high oil pressure governor and the servomotor start chamber, and cartridge valve B is connected in series on the oil circuit connecting the high oil pressure reversing valve and the servomotor shutdown chamber. A. Cartridge valve B guides the oil circuit to connect with a port of the electromagnetic reversing valve. Cartridge valve C is connected to the shutdown cavity of the servomotor and the high-pressure oil circuit. Cartridge valve D is connected to the servomotor startup cavity and the oil return circuit. , Cartridge valve C, cartridge valve D guide oil circuit is connected with another port of the electromagnetic reversing valve.

The utility model is also characterized in that,

Cartridge D with stroke adjustment.

The beneficial effect of the utility model is that it is matched with a high oil pressure governor and applied to a relatively large water turbine unit to realize accident shutdown.

Compared with the prior art, the utility model has the following advantages:

1. Use the cartridge valve instead of the accident pressure distribution valve, which has reliable performance, simple structure and low price.

2. All pipelines are connected in series and parallel in the governor, without open pipes, convenient installation and construction, low cost and beautiful appearance.

3. The emergency shutdown device is installed in the governor cabinet, which is easy to operate.

4. The entire hydraulic system is novel in design and compact in structure.

Description of drawings

Accompanying drawing is the structural representation of the shutdown device of the present utility model.

In the figure, 1. Cartridge valve A, 2. Cartridge valve B, 3. Cartridge valve C, 4. Cartridge valve D, 5. Electromagnetic reversing valve, 6. Servostat, 7. High oil pressure speed regulation reversing valve.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The structure of the shutdown device of the present utility model is shown in the accompanying drawings. The large-diameter cartridge valve A1 and the cartridge valve B2 are connected in series on the oil circuit of the reversing valve 7 of the high oil pressure governor and the servomotor 6. The cartridge valve A1 Connected in series to the side of the start chamber of the servomotor 6, the cartridge valve B2 is connected in series to the side of the shutdown chamber of the servomotor 6, the guide oil circuit of the cartridge valve A1 and the cartridge valve B2 is connected to a port of the electromagnetic reversing valve 5 . Connect the plug-in valve C3 and the plug-in valve D4 with the same diameter in parallel to the start-up cavity and the shutdown cavity of the servomotor 6, the plug-in valve C3 is connected to the shutdown cavity of the servomotor 6 and the high-pressure oil circuit, and the plug-in valve D4 is connected to the The starting chamber of the servomotor 6 and the oil return circuit. The cartridge valve C3 and the cartridge valve D4 guide the oil passage to communicate with the other port of the electromagnetic reversing valve 5 .

During normal operation, the guide oil of the cartridge valve C3 and the cartridge valve D4 is connected to the pressure oil, the main oil circuit of the two cartridge valves is disconnected from the system oil circuit, and the cartridge valves are closed. Cartridge valve A1 and cartridge valve B2 are opened, and the guide oil of the two cartridge valves is connected to discharge oil, so that the oil in the two directions of the main oil circuit of the cartridge valve can flow freely, and the reversing valve 7 of the high oil pressure governor is connected. And control the servomotor 6. When shutting down, the high-pressure oil flows out from the reversing valve 7 of the high oil pressure governor and enters the shutdown cavity of the servomotor 6 through the cartridge valve B2, pushing the piston of the servomotor 7 to move, and the oil in the startup cavity of the servomotor 6 passes through the cartridge The back flow of valve A1 impels the turbine to shut down.

When shutting down due to an accident, the electromagnetic reversing valve 5 is reversing, the cartridge valve A1 and the cartridge valve B2 are closed, and the cartridge valve C3 and the cartridge valve D4 are opened. The oil circuit between the high oil pressure governor and the servomotor 6 is cut off, the servomotor 6 is controlled by the cartridge valve C3 and the cartridge valve D4, and the pressure oil flows out from the electromagnetic reversing valve 5 and enters the servomotor through the cartridge valve C3 The shutdown chamber of 6 pushes the piston of servomotor 6 to move, and the oil in the startup chamber of servomotor 6 enters the oil return circuit through cartridge valve D4. Cartridge valve D4 has stroke adjustment, and controls the shutdown speed of the turbine unit by adjusting the return oil flow. To ensure the reliable shutdown of the turbine unit when the high oil pressure governor fails.

The electromagnetic reversing valve can be remotely controlled electrically or manually. The four cartridge valves and the electromagnetic reversing valve can be installed in the governor cabinet, and the series and parallel connection of the oil circuit is realized in the corresponding integrated block in the governor. There is no open pipe, the layout is simple, and the operation is convenient.

Claims (2)

1. water turbine accidental shutdown device based on cartridge valve; it is characterized in that; comprise the cartridge valve A (1) on the identical oil circuit that is connected on high oil pressure speed regulator selector valve (7) and servomotor (6) of latus rectum; cartridge valve B (2) and the cartridge valve C (3) that is connected in servomotor (6) start chamber and shutdown chamber in parallel; cartridge valve D (4); also comprise solenoid directional control valve (5); described cartridge valve A (1) is connected on the oil circuit that connects high oil pressure speed regulator selector valve (7) and servomotor (6) start chamber; described cartridge valve B (2) is connected on the oil circuit that connects high oil pressure selector valve (7) and servomotor (6) shutdown chamber; cartridge valve A (1); cartridge valve B (2) guiding oil circuit is connected with a port of solenoid directional control valve (5); described cartridge valve C (3) is connected on servomotor (6) shutdown chamber and the high-pressure oil passage; described cartridge valve D (4) is connected on servomotor (6) start chamber and the oil return circuit, cartridge valve C (3); cartridge valve D (4) guiding oil circuit is connected with another port of solenoid directional control valve (5).

2. the water turbine accidental shutdown device based on cartridge valve according to claim 1 is characterized in that described cartridge valve D (4) has stroke adjustment.

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