Decompression drainage and air supply shared system for top cover of water turbine

Abstract

The utility model relates to a water turbine top cover pressure reducing, water draining and air supplementing shared system which is used for water turbine top cover pressure reducing, water draining and air supplementing and comprises a top cover, a water draining and air supplementing branch pipe, a water draining and air supplementing annular pipe, a water draining pipe, an air supplementing pipe and a reserved forced air supplementing pipe. The drainage pipe is led out from the pressure reduction drainage air supply ring pipe and drains water to a water turbine draft tube, the air supply pipe is led out from a power plant to the drainage air supply ring pipe, a reserved forced air supply pipe is arranged on the air supply pipe, and forced air supply can be conducted on the water turbine when necessary. According to the water turbine top cover pressure reduction drainage and air supply shared system, the functions of a top cover pressure reduction drainage pipe, a vacuum breaking valve and a reserved forced air supply pipe are integrated, and top cover equipment arrangement can be optimized.

Description

Technical Field

[0001] The utility model relates to the technical field of water turbine manufacturing and control, in particular to a water turbine top cover pressure reduction, drainage and air supply sharing system. Background Art

[0002] Francis turbines are typically equipped with a top cover pressure relief drain, a vacuum breaker valve, a reserved forced air supply pipe, and other equipment. The top cover pressure relief drain is used to eliminate water leaks above the runner, thereby reducing axial hydraulic thrust on the runner. The vacuum breaker valve injects air to break the vacuum when a certain vacuum is formed above the runner, eliminating pressure pulsation, reducing unit vibration, and reducing the reverse impact of tailwater to prevent turbine lift. When the unit's natural air supply is ineffective or insufficient, compressed air is added through the reserved forced air supply pipe to improve turbine operation. The top cover pressure relief drain, vacuum breaker valve, reserved forced air supply pipe, and other equipment are all located on the top cover. These devices and piping are numerous, making layout relatively easy for large units. However, small and medium-sized units have smaller internal space inside the top cover, making layout more difficult and often requiring simplified equipment configuration, which can affect the unit's safe and stable operation. Utility Model Content

[0003] The utility model provides a turbine top cover decompression drainage and air supply common system, which integrates the functions of a top cover decompression drainage pipe, a vacuum breaking valve, and a reserved forced air supply pipe, and can optimize the layout of top cover equipment.

[0004] The above technical problems of the present invention are mainly solved by the following technical solutions:

[0005] The utility model discloses a top cover pressure-reducing drainage and air supply sharing system, comprising a top cover, a plurality of pressure-reducing drainage and air supply branch pipes uniformly distributed on the top cover, the pressure-reducing drainage and air supply branch pipes passing through the machine pit lining and leading to the pressure-reducing drainage and air supply ring pipe, the drainage pipe leading out from the pressure-reducing drainage and air supply ring pipe, draining water to the turbine tailwater pipe, the air supply pipe leading from outside the power plant to the pressure-reducing drainage ring pipe, and a reserved forced air supply pipe provided on the air supply pipe. The top cover pressure-reducing drainage and air supply sharing system integrates the functions of the top cover pressure-reducing drainage pipe, the vacuum breaking valve, and the reserved forced air supply pipe. When the turbine is in stable operating condition, water leakage above the runner is removed through the drainage pipe, and air is supplied through the air supply pipe when a certain vacuum degree appears above the runner. When the natural air supply effect of the unit is poor or the air supply volume is insufficient, compressed air can be supplied through the reserved forced air supply pipe.

[0006] Preferably, a gate valve is provided on the drainage pipe, which is normally in an open state, closed when the top cover is forced to replenish air, and opened after the top cover is forced to replenish air.

[0007] Preferably, the air supply pipe is provided with a stop valve a and an air supply valve. When a certain vacuum is established above the rotor, the air supply valve automatically opens, allowing air to be supplied along the air supply pipe, the decompression and drainage air supply ring pipe, and the decompression and drainage air supply branch pipe. The air supply valve automatically closes when the vacuum is broken. The stop valve a can adjust the air supply volume and needs to be closed when forced air supply is applied by the top cover.

[0008] Preferably, the reserved forced air supply pipe is provided with a stop valve b, a check valve, and a quick connector to facilitate the supply of compressed air and connection to the compressed air source equipment.

[0009] The beneficial effects of the utility model are as follows: the utility model arranges the drainage pipe, the air supply pipe, and the reserved forced air supply pipe directly or indirectly on the pressure-reducing drainage and air supply ring pipe, integrates the functions of the top cover pressure-reducing drainage pipe, the vacuum breaking valve, and the reserved forced air supply pipe, replaces the traditional arrangement method, and optimizes the equipment layout of the top cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a structural schematic diagram of a top cover pressure reduction, drainage and air replenishment system provided by the utility model in a specific embodiment.

[0011] Explanation of the accompanying symbols: top cover 1, pressure-reducing drainage and air supply branch pipe 2, pressure-reducing drainage and air supply ring pipe 3, drainage pipe 4, gate valve 41, air supply pipe 5, stop valve a51, air supply valve 52, reserved forced air supply pipe 6, stop valve b61, check valve 62, quick connector 63. DETAILED DESCRIPTION

[0012] The technical solution of the present invention will be further specifically described below with reference to the embodiments and the accompanying drawings.

[0013] Example: The top cover decompression drainage and air supply sharing system of this example, such as Figure 1 As shown, the roof decompression, drainage, and air supply system includes a roof 1, decompression, drainage, and air supply branch pipes 2, a decompression, drainage, and air supply ring pipe 3, a drain pipe 4, an air supply pipe 5, and a reserved forced air supply pipe 6. The roof 1 is mounted on the turbine. Multiple decompression, drainage, and air supply branch pipes 2 are evenly distributed on the roof, passing through the pit lining and leading to the decompression, drainage, and air supply ring pipe 3. A drain pipe 4, equipped with a gate valve 41, exits from the decompression, drainage, and air supply ring pipe and discharges water to the turbine tailwater pipe. An air supply pipe 5, equipped with a stop valve a51 and an air supply valve 52, is also located on the air supply pipe 5. A reserved forced air supply pipe 6 is also installed on the air supply pipe 5. This reserved forced air supply pipe is equipped with a stop valve b61, a check valve 62, and a quick connector 63.

[0014] During use, when the turbine is in stable operation, water leakage above the runner is discharged to the tailwater pipe along the reduced pressure drainage air supply branch pipe 2, the reduced pressure drainage air supply ring pipe 3, and the drain pipe 4, and the gate valve 41 is in the open state; when a certain vacuum degree appears above the runner, the air supply valve 52 automatically opens, and air is supplied to the top of the runner along the air supply pipe 4, the reduced pressure drainage air supply ring pipe 3, and the reduced pressure drainage air supply branch pipe 2. After the vacuum is broken, the air supply valve 52 automatically closes, and the stop valve a51 is fully open or partially open; when the natural air supply effect of the unit is poor or the air supply volume is insufficient, the quick connector 63 is connected to the compressed air equipment, and compressed air is supplied to the top of the runner along the check valve 62, the stop valve b61, the reserved forced air supply pipe, the reduced pressure drainage air supply ring pipe 3, and the reduced pressure drainage air supply branch pipe 2, the stop valve b61 is in the open state, and the gate valve 41 and the stop valve a51 are in the closed state.

[0015] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A turbine top cover decompression, drainage and air supply common system, used for turbine top cover decompression, drainage and air supply, comprising a top cover (1), characterized in that: The top cover (1) is provided with a plurality of pressure-reducing drainage and air-supply branch pipes (2), the pressure-reducing drainage and air-supply branch pipes (2) pass through the lining of the machine pit and are led to the pressure-reducing drainage and air-supply ring pipe (3), the drainage pipe (4) is led out from the pressure-reducing drainage and air-supply ring pipe (3), and the water is discharged to the tail water pipe of the turbine, the air-supply pipe (5) is led from outside the power plant to the pressure-reducing drainage and air-supply ring pipe (3), and a reserved forced air-supply pipe (6) is provided on the air-supply pipe (5) for forced air supply to the turbine.

2. The turbine top cover decompression, drainage and air supply system according to claim 1, characterized in that: The drain pipe (4) is provided with a gate valve (41), which is normally in an open state, closed when the top cover is forced to replenish air, and opened after the top cover is forced to replenish air.

3. The turbine top cover decompression, drainage and air supply system according to claim 1, characterized in that: The air supply pipe (5) is provided with a stop valve a (51) and an air supply valve (52) connected in series. When a certain vacuum degree appears above the runner, the air supply valve (52) automatically opens, and air is supplied along the air supply pipe (5), the decompression and drainage air supply ring pipe (3), and the decompression and drainage air supply branch pipe (2). When the vacuum is broken, the air supply valve (52) automatically closes.

4. The turbine top cover decompression, drainage and air supply system according to claim 1, characterized in that: The reserved forced air supply pipe (6) is provided with a stop valve b (61), a check valve (62) and a quick connector (63) connected in series for supplying compressed air.

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