FIELD: agriculture.
SUBSTANCE: invention relates to the field of fishing industry and can be used for direct displacement of fish, mainly for fencing areas of fish aggregation or trails of their displacement from getting fish to water intake. The combined double circuit protection device consists of double circuit screen and is equipped with a current-maker. The filter water intake screen consists of two circuits. The first circuit of the screen is a set of at least two current-making plates located at an angle of from 1° to 179° to the filter surface of the second circuit of the screen. At that the individual plates as part of the first circuit of the screen can have a different angle of location with respect to the filter surface of the second circuit of the screen. The height of each plate of the first circuit of the screen and the distance between the individual plates of the first circuit of the screen can be arbitrary or different within the first circuit of the screen. The second circuit of the screen is a set of at least two plates located one behind the other at an angle from 0° to 90° to the water intake flow. And the shape of the filter surface of the second circuit of the screen can be arbitrary. The height of the plates of the second circuit of the screen and the distance between them can be arbitrary. The plates of the first circuit of the screen are located at an angle of 1° to 90° to the plates of the second circuit of the screen. The plates of the first circuit of the screen to the plates of the second circuit are made in the form of a single structural element, namely a reinforcement rib of the first and the second circuits of the screen, or mounted permanently and rigidly fixed on the surface of the second circuit of the screen, or mounted on the surface of the second circuit of the screen by the hinge joint. Between each two adjacent plates of the first circuit of the screen and the filter surface formed by the plates of the second circuit of the screen the fish divertive chute is formed.
EFFECT: enhanced efficiency of the device operation under conditions of the presence of currents of alternating directions at great speeds is provided.
7 dwg
