RU78816U1 - FISH PROTECTION DEVICE - Google Patents

Abstract

A fish protection device, including a rotating mesh cone with a fish outlet at the top and a washing device made in the form of a water-jet flute with jet-forming nozzles; the mesh cone is located inside a rectangular (or other) casing, one of the sides of which is made in the form of hinged plates that open when there is excessive vacuum pressure that occurs in the chamber of the cone when the mesh is clogged, and closes as the mesh is cleaned and normal vacuum pressure is restored on a mesh cone.

Description

The proposed utility model relates to the field of hydraulic engineering, in particular, to devices that protect fish from getting into water intakes.

Known cone mesh fish protection device (copyright certificate No. 264231. The basis of this device is: a filter element (frame covered with a net cloth), made in the form of a truncated cone, fish drain and a garbage-cleaning device in the form of a water flute.

The protection of fish by such a device is based on the defensive reaction of the fish to a rotating net cloth impermeable to them and forced removal from the top of the cone, where the young fish rolls under the action of the water intake.

The disadvantage of this device is its low operational reliability during the formation of sludge in the intake stream (early spring) and the presence of high concentrations of floating debris (in flood), when the water-jet flute does not have time to completely clean the cone grid, which leads to an increase in vacuum pressure on the RPM and , as a result, to rupture of the protective net web. Such constantly

occurring phenomena reduce the effectiveness of the protection of fish and force to reduce the throughput of the device.

The technical problem posed to the utility model is to increase the water throughput and operational reliability of the device without loss of fish protection efficiency.

This technical problem is solved in that one of the sides of the casing into which the rotating mesh cone is placed is made in the form of hinged plates.

The proposed design of a fish protection device makes it possible to expand the conditions for its use according to the degree of contamination of the water source, increase water throughput and increase operational reliability due to hinged plates that act as an emergency valve and automatically open when the mesh surface of the cone is clogged above threshold values.

Figure 1 shows a General view of the device.

Figure 2 is a section along aa.

Figure 3 is a section along BB.

The fish protection device includes a mesh screen 1 located on the side surface of the cone, which is located inside the casing 2 of a rectangular (or other) shape, one side of which consists of

plates 3, placed on the axes 4 and opening as the pressure drop in the inner cavity of the cone. At the top of the cone there is a pipe 5 for the removal of fish and garbage (fish drain). The cone rotates in bearings 6 (the rotation drive can be any) mounted on load-bearing elements that ensure the rigidity of the device. Inside the casing, but on the outside of the cone, a washing device is installed, made in the form of a water-jet flute 7 with jet-forming nozzles. Water is supplied to the water-jet flute through pipe 8. A suction pipe 9 is located on the left side of the device.

The device operates as follows. The water intake enters through the base of the cone, passes at an acute angle the lateral mesh surface 1 of the rotating cone and enters the water intake window 9 of the pumping station. In this case, the hinged plates 3 located on one side of the casing are in the closed position. The mesh cone 1 is rotated by any rotation drive (electric, hydromechanical, etc.). Water under pressure through a pipe 8 is fed to a water-jet flute 7 and jet-forming nozzles. The adult juvenile fish located in the intake stream, capable of withstanding the speed of the approaching stream, moving away from contact with the net 1, moves independently to the inlet of the fish outlet 5. Small debris and early juveniles, not able to withstand the speed of the approaching stream and independently move along the mesh screen 1,

It is delivered to the entrance to the fish drain 5 forcibly due to the water-jet flute 7, which repels adhering objects from the net 1, and by the force of the intake flow, which, when approaching the net at an acute angle, acts as a transit stream and transfers the garbage and early juveniles beaten off by the water-jet flute 7 downstream to the top of the mesh cone. The suction of 5 objects accumulated in the top of the cone into the fish outlet occurs due to the ejector pump.

In the presence of a high concentration of sludge or small debris (in the early spring and flood periods), when the net 1, stretched on the side surface of the cone, begins to clog above the established norm, the vacuum pressure on the cone increases to the values when the hinged plates 3 automatically start to open, and part of the water flow begins to flow into the intake window through the formed slots between the plates 3 in one of the sides of the casing 2. At the same time, due to a decrease in the water flow through the side mesh surface 1, intensity grid clogging and improves the efficiency of the washing device 7. After cleaning the grid 1 up to the initial level of vacuum pressure on the plug is reduced and the plate 3 are automatically closed by its own weight (or some other mechanism).

Claims (1)

Fish protection device, including a rotating mesh cone with a fish outlet at the top and a washing device made in the form of a water-jet flute with jet-forming nozzles; the mesh cone is located inside a rectangular (or other) casing, one of the sides of which is made in the form of hinged plates that open when there is excessive vacuum pressure that occurs in the chamber of the cone when the mesh is clogged, and closes as the mesh is cleaned and normal vacuum pressure is restored on a mesh cone.