RU85918U1 - FISH PROTECTION DEVICE - Google Patents

Abstract

The fish protection device comprises a curved louvered filter surface. Allows you to increase the efficiency of fish protection filter without increasing its size and increase energy consumption.

Description

The proposed utility model relates to hydraulic structures and more specifically to fish protection devices when taking water from natural reservoirs.

There are many designs of fish protection filters, the common features of which include the presence of filtering water mesh, perforated, louvered surfaces, see, for example, devices according to ed. testimonial. and patents of the USSR and the Russian Federation No. 1191517, 1984; 2,153,040, 1998; IPC E02B, 8/08 and others, of which filters containing a water-receiving surface (screen) of louvre plates, in front of which there is a flow generator, creating a transit flow parallel to the screen plane, are widely used.

Design differences between the known filters are caused by different operating conditions: by type of water source, operating mode, application conditions, etc., and yet, they may not meet the specific conditions of their use.

For example, in front of the applicant organization of this utility model, in accordance with the design assignment, it was required to develop a fish protection device for a semi-submersible drilling rig (FPBU) used in oil and gas exploration in the shelf of the Kara and Baltic Seas.

General requirements for watercraft are the minimum possible weight, dimensions and energy consumption for devices and mechanisms used on these vehicles. The experience of creating fish protection devices on floating platforms shows that such opportunities are presented by choosing the appropriate design of the water intake (filtering) surface.

Known for the prototype fish protection device according to the patent of the Russian Federation No. 2219308, IPC E02, 8/08, 2002

The known device is a louvered water intake surface installed in the window of the water intake structure and surrounded by nozzles of the flow generator.

A ballast float, similar to a closed pipe, fixed around the perimeter of a platform with drilling equipment (see, for example, “Maersk Explorer”) serves as a water intake facility. Kingston boxes are placed inside the float, from where the process seawater is pumped to the platform equipment by pumps through autonomous shutters (of course, if necessary, the float itself can also be filled with the required volume of seawater). A disadvantage of the known device is inherent in all similar devices (boats) - overweight and increased energy consumption.

In accordance with the foregoing, the elimination of known shortcomings is the task of the claimed utility model.

The problem is solved in that a fish protection device is proposed comprising at least one louvered water receiving surface washed by a flow stream of a flow former and mounted in a window opening of the water receiving structure.

New in the proposed device is that the louvered surface is curved, replacing the curved surface of the window opening of the water intake structure, and the vector of the transit flow washing the louvered surface is tangent to the curve characterizing the curvature of the louvered surface.

The technical result of the claimed device is to increase the efficiency of fish protection with a curved louvered surface by about 30% without increasing its size and increasing energy consumption.

Figure 1 schematically shows a fragment of the claimed device, a side view in section; figure 2 - scheme of the device.

The claimed device (Fig. 1) contains a ballast float 1 in the form of a closed pipe fixed along the perimeter of the platform (not shown in the drawings) with drilling equipment. Kingston boxes 2 for outboard water are connected inside the float, connected through autonomous shutters 3 with pumps 4 mounted on the platform. The louvered water receiving (filtering) surface 5 in the form of a removable cartridge is mounted in a curved opening of the water intake window 6 made in the wall of Kingston 2 (float 1), reproducing the missing part of its curved wall and surrounded by nozzles 7 of the flow generator.

The device operates as follows (figure 2).

With the beginning of the intake, the flow of water entering the kinston 2 through the louvered surface 5 in the direction of the arrow “A” meets the transverse stream flowing out in the direction of the arrow “B” from the nozzles 7 of the flow generator. As a result, the total flow becomes curvilinear (arrow "G"), i.e. geometrically the curvature of the vector of the total flow repeats the curvature of the envelope of the surface 5, or, using the appropriate terminology, it can be stated (with well-known assumptions) that the vector of the total flow is tangent to the curve characterizing the curvature of the louvered surface. From figure 2 it can be seen that with the same area of the declared curved surface (cartridge) 5 and the area of the rectilinear surface 8 of the prototype, the effective area of the declared above is "D", because with a flat cartridge 8 the washer flow "falls off" and it stops washing part louvered surface.

Claims (1)

Fish protection device containing at least one louvered water receiving surface washed by the flow stream of the flow former and mounted in the window opening of the water receiving structure, characterized in that the louvered surface is curved, replacing the curved surface of the window opening, and the vector of the total flow washing it is tangential to a curve characterizing the curvature of the louvered surface.