SU675122A1 - Deep water conduit gate - Google Patents

Description

I

The invention relates to the equipment of hydraulic structures and can be used to block the deep holes of the culvert hydraulic structures.

Known closure devices for deep water conduits include a groove shaft, a system of aeration pipes, a flat closure, the knife part of which is closed and has openings designed to aerate the flow in order to reduce the cavitation phenomena behind the closure 1.

In such devices, however, jet air saturation occurs only at the point of exit of the aeration tube. In sections of the conduit section that are not adjacent to the outlet of the aeration tube, including in the main source of flow stalling - in the area of the shutter knife, flow aeration is not sufficient, which leads to cavitational equalization, i.e. reduce the reliability of the device.

The aim of the invention is to increase reliability by providing aeration in the blade part of the valve with different overlaps of the deep hydraulic conduit.

This is achieved by the fact that the outlet openings of the aeration pipes are brought into the grooves of the shaft at the level of the ceiling of the conduit, and on the upper and lower edges of the gate there are sealing lugs that are spaced in the slots of the mine and have a seal around the contour.

FIG. 1 shows the proposed device, a longitudinal section; in fig. 2 shows section A-A in FIG. I; in fig. 3 - device in plan; in fig. 4 shows a section BB in FIG. one; in fig. 5 shows a section B-B in FIG. one.

The shutter device includes a shutter 1 with supporting parts 2. The apertures of the aeration pipes 3 are inserted into the slots 4 of the shaft at the level of the ceiling of the deep conduit 5. The upper and lower edges of the shutter 1 are sealed with the projections 6, which are placed in the grooves 4 and sealed the walls of the grooves along the contour by means of seals 7.

In the area of the shutter knife, a box-like structure is made -collector 8. In the side

the walls S are made holes 9, retired into the grooves 4.

In the rear wall of the collector 8 is made holes 10, facing the downstream. Thus, an air-line "atmosphere-aeration pipe-zone-collector with openings" is created. The area is bounded by the surface of the grooves, the side surface of the shutter and sealing protrusions.

The length of this line varies with different partial shutter openings and, accordingly, different positions in the slots.

The operation of the device is as follows.

When the shutter closes the deep hole, both during the shutter maneuvering in the flow and when the hole is partially opened, air is sucked through the aeration pipes 3, which then passes through the zone bounded by the surface of the grooves 4, the lateral surface of the gate span 1 and the sealing projections 6 and enters the collector 8 through its holes 9. Then the air comes out through the holes 10 into the zone of the bolt knife from the downstream.

As a result of this entry of air, the vacuum in this zone is reduced, and the cavitation effects are reduced accordingly. Due to this, the blade shatter caused by cavitation is also reduced.

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It is most expedient to use the invention in cases where a continuous operation of the depth gate at partial openings of the hole is necessary or frequent maneuvering of the depth gate in the flow is observed.

Claims (1)

1. Polonsky, A. A. Mechanical equipment of hydraulic structures. M., l974, p. 21-22. A- A {.  J -w 7 / / 0.  ., fiA FIG. 2 FIG. in- in YU . : And-- l. FIG. five