SU1756456A1 - Emergency shutofe device for pressure water line - Google Patents

Abstract

Usage: in hydroelectric power plants for shutting off turbine water lines. The essence of the invention: a flat gate 2 is installed in the slots 4 of the shaft and the turbine duct 1. A tank 7 is connected to the upper part of the shaft, communicated with reservoir 8, the shaft is made with channel 6, which communicates the tank 7 with the gate space of the conduit 1. Gate 2 by bar 3 is connected with an actuator 5. In an emergency situation, for example, when an external object enters the turbine guide, and part of the vanes of the guide vanes do not close, the water line 1 is blocked by the gate 2. In the process of water 1 closure L equilibration of water pressure from the upstream reaches the stopper space through channel 6 from tank 7, unloading the stopper 2 pressure on it from the downstream side. 1 il. (Ls

Description

The invention relates to hydraulic engineering and can be used in mechanical equipment systems of hydraulic structures.

The purpose of the invention is to increase the reliability of operation by reducing the load '* on the shutter during maneuvering, when the device is located in pressure water dc ^ o * 7 from the reservoir.

The drawing shows an emergency repair - 1 nnoe shut-off device pressure head conduit, General view.

The pressure pipe 1, has a flat emergency repair valve 2. Using the rods 3, the raising and lowering of the valve 2 along 1 of its groove 4 is provided by the actuator 5. The groove 4 is equipped with a vertical shaft 6, to the upper part of which an open tank 7 is connected, which communicates with the reservoir 8 using channel 9. 2

Emergency repair shutter device operates as follows.

In the initial period, the shutter 2 is lowered when the pressure is practically equal before and after it, since 2 the open tank 7 is connected via channel 9 to the shut-off space of the pressure pipe 1.

This situation is maintained until the opening of the shutter 2 starts to let through the flow rate less than the partial flow rate of the flowing water, caused, for example, by the non-closure of part of the blades of the hydraulic turbine guide apparatus of the downstream hydropower plant 3 (not shown) due to the ingress of foreign objects between them. .

From this moment, the missing part of the flow rate along the pressure duct 1 behind the valve 2 is replenished along the channel 9 from an open container 7, the water level in which> thereby decreases. Overpressure equal to the difference in water levels in the reservoir 8 and the open tank 7 begins to act on the flat shutter 2.

This difference will be the largest at the moment of the complete closure of the shutter 2, which is taken into account the design of the emergency shutter 2 complex, as well as the size of the open tank 7.

Claims (1)

Claim 5 Emergency-repair shut-off device for a pressure water conduit, including a flat shutter installed in the slots of the shaft and the water conduit, a drive located above the shaft and connected to the shutter, and a water supply system from the upstream to the shut-off space, characterized in that, in order to increase reliability in operation by reducing the load on the shutter during maneuvering when the device is located in the discharge conduit from the reservoir side, the water supply system from the upstream to the shut-off space is made in the form of an open a tank adjacent to the upper part of the shaft and in communication with the reservoir, and the grooves of the shutter are located in the plane of the upper wall of the shaft, and the shaft is made with a cross-sectional height greater than the width of the grooves with the formation between the lower wall of the shaft and the grooves of the channel communicating the tank with the sealing space of the pressure conduit , "