Electrode section

FIELD: electricity.

SUBSTANCE: electrode section is made as a flat structure, it consists of horizontal and vertical electrodes. The section is divided into 2 and more electrodes vertically and horizontally the section includes 1 and more electrodes. Diameter of the horizontal and vertical electrodes is not less than 10 mm, length of each electrode is more than 1m, and distance between the electrodes is not less than 0.05 m. Voltage is supplied either to horizontal or vertical electrodes only or to horizontal and vertical electrodes simultaneously.

EFFECT: more uniform structure of the electric field, increase in operational efficiency of the device without essential increase in the structure volume, improvement of operational reliability and efficiency of the device.

3 dwg

 

The claimed technical solution relates to the field of fisheries and can be used for directional movement of fish, mainly for fencing accumulation areas of fish tracks or move them from getting the fish in the water.

Known technical solutions, acting on the fish front electric field, discouraging her from lifting, see, for example, "the Way of the power electrodes for directional movement of fish (options)," RF patent No. 2273991, IPC AC 79/02; "Method of attracting fish" ed. St. USSR №390799, M. CL. A01k 79/02.

Closest to the claimed technical solution is a device for directional movement of fish, consisting of a source of pulse current, pulse distributor, a control unit and sections of the electrodes, in which the pulse distributor consists of pairwise connected by controlled switches, the number of pairs being equal to the number of sections of the electrodes, with a key pair installed in series and connected in parallel to the source of pulse current so that one of the keys of each pair is connected with the positive output and the other with negative. In this section electrodes connected respectively to the circuit connecting the keys of each pair, where under the influence of frontal barrier electric field is scaring away ture of the water from the water (see "Device for the directional movement of fish" in ed. St. USSR №535930, M. CL. AC 61/00, 79/02).

A disadvantage of the known design is not sufficiently uniform electric field created by the device, and that the contact of juvenile fish from the filter surface and its penetration in water is not excluded.

The objective of the proposed technical solution is the provision of a more uniform structure of the electric field and increase of efficiency of functioning of the device without a substantial increase in design, increase reliability, operability of the device.

This object is achieved in that the proposed electrode section, which is a flat design and consisting of horizontal electrodes and the vertical electrodes. Vertical electrode section is divided into 2 or more electrodes, the horizontal number of electrodes in a section is 1 or more. The diameter of the electrodes both horizontally and vertically, is not less than 10 mm, the Length of each electrode is more than 1 m, the distance between the electrodes is not less than 0.05 m

Distinctive features of the prototype features of the claimed technical solution is the split electrode sections horizontally and vertically on the electrodes, the number of electrodes in a section vertical is two and b is more, horizontally from one or more, the diameter of each electrode is not less than 10 mm, the length of each electrode is more than 1 m, the distance between the electrodes as horizontally and vertically not less than 0.05 m

The technical result of the proposed technical solution is to develop a more uniform electric field and increase of efficiency of functioning of the device without a substantial increase in design, increase reliability, efficiency operation.

The essence of the proposed technical solution is illustrated by drawings:

figure 1 schematically shows an example of execution of the claimed technical solution (front view);

figure 2 schematically shows an example of execution of the claimed technical solution (front view) with a minimum number of electrodes in the electrode section (2 vertical and 1 horizontal);

figure 3 schematically shows the resulting linear electric field in the target electrode section of figure 1 (top view).

Electrode section (figure 1) is a flat structure and is composed of horizontal electrodes 1 and the vertical electrodes 2. The number of electrodes, which is divided electrode section vertically, is 2 or more, horizontally, from 1 or more.

The number of the horizon is selected electrodes and the number of vertical electrodes in the electrode sections are determined depending on the design specifications of the device and the specific conditions of its operation (from the depth of the waters, migration routes of fish, where they are, topography etc).

The diameter of each electrode is equal to not less than 10 mm, the length of each electrode is more than 1 m, the distance between the electrodes as horizontally and vertically not less than 0.05 m

It should be noted that the rectangular shape of the electrodes in the electrode section is used as a special case of the execution of the claimed technical solution, the shape of the electrode can be any, in the cross-section of the electrode may be a circle, ellipse, triangle, and square, and so on, i.e. we are talking about an aggregate, and not simply its geometrical form.

Declared electrode section may consist of rigid electrodes, made in the form of tubes, bars, etc. and flexible electrodes, soft bare cables. Moreover, the flexible electrode can be exposed cable or chain with a missing through the chain links naked residential or be a chain with worn over her braid tin-plated copper, so when the water level dropped in the water source are prevented from touching the vertical flexible electrodes, as under the weight of the vertical electrode is formed on the bottom of the water source, and fluctuations in the velocity of the approach flow or wave oscillations are prevented from touching the horizontal flexible electrodes, as under the weight of the chain horizontal electrode bodymedia volatile stream.

The principle of operation of the claimed technical solution is that can be used either horizontal electrodes 1 declared electrode section, or only the vertical electrodes 2, and the vertical and horizontal electrodes at the same time, creating in the zone of influence of the intake uncomfortable conditions for fish by forming in the water source line pulsed electric field 3 (figure 3), which causes the fish defensive reaction, forcing out of the dangerous zone of water intake.

The task of bringing more uniform structure of the electric field and the efficiency of the device without a substantial increase in design, increase reliability, performance, operation, performed.

Application of the proposed technical solution allows to use well-known in the industry elements.

The present technical solution can be used to limit the accumulation areas of fish tracks or move them from getting the fish in the water.

Electrode section, which is a flat structure, wherein the electrode section consists of horizontal electrodes and the vertical electrodes, the vertical electrode section is divided n is 2 or more electrodes, horizontally, the number of electrodes in the electrode section is from 1 or more, the diameter of the electrodes horizontally and vertically is not less than 10 mm, the length of each electrode is more than 1 m, the distance between the electrodes is not less than 0.05 m, the voltage is applied or only on the horizontal electrodes, or only on the vertical electrodes, or both the vertical and horizontal electrodes at the same time.



 

Same patents:

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

FIELD: construction.

SUBSTANCE: complex fish-protection structure of guard and guide action comprises a horizontal element - a stationary structure in the form of a horizontal slab and a behavioural guide element (a screen). The horizontal slab adjoins a water intake structure and forms a gallery, through which the water intake flow moves into the water intake. The horizontal slab separates the flow into its upper and lower parts and creates a zone in the upper part, which does not communicate with the water intake flow, which is optimal for vital functions and reproduction of fish without risk of getting into the water intake. The guide element is made as vertical or inclined in the form of sections of an electric fish barrier, or a water-air curtain, or an air-bubble curtain, or a louver fish-protection device. The guide element is installed at the inlet to the gallery and provides for independent exit of fish from the lower part of the flow into the upper more comfortable zone of the water source. The horizontal slab is arranged below the water surface level. The length of the horizontal slab makes at least the height of the water intake window. The device may be installed in any conditions regardless of availability or unavailability of a transit flow. The device does not comprise a fish intake part that leads to the fish takeout.

EFFECT: increased efficiency of device functioning and expanded conditions of its application.

2 dwg

FIELD: construction.

SUBSTANCE: device comprises a double circular boom floating on water surface. The boom is closed at the bottom along the inner contour with a meshed bottom or electrodes, where electric current is supplied. The air-lift flow is formed in the space between the booms at the bottom. The air-lift flow captures fine protected items from upper levels of the water reservoir and sends them to fish discharge. Large protected items from the lower layers of water are separated from the water-receiving tract with the meshed bottom or electrodes. The water-intake flow at the inlet is vertical, directed at the bottom upwards and is perpendicular to the flow at the outlet. Water is discharged from the space inside the double circular boom.

EFFECT: invention provides for efficient protection of fish.

2 dwg

FIELD: construction.

SUBSTANCE: complex fish protection device of barrier-filtering action comprises a water-permeable screen. The screen comprises filtering meshy and/or louver elements. Elements are combined into horizontal lines in rows and along the vertical line into modules. Besides, the device may comprise sections of electrodes. Each separate filtering element is isolated from others with the help of a dielectric material and is made of an electroconductive material or a material that does not conduct current. The number of rows of filtering elements and modules makes from 1 and more. Each row comprises meshy or louver elements. Each module comprises meshy or louver elements, or meshy and louver elements simultaneously. The number of filtering elements in one row and in one module makes from 1 and more. The size of the cell in the meshy cloth of the meshy element makes from 1 mm and more. The clear space between louver plates of the louver element makes from 10 mm and more. Along the horizontal line the rows of meshy and louver elements may alternate and be arranged in any sequence. The size of the cell in the meshy cloth of the meshy elements and the clear space between louver plates of the louver elements in different rows and modules may be different. Pulse current is supplied to all or separate filtering elements, creating electric field around the water-permeable screen.

EFFECT: increased efficiency of device functioning.

6 cl, 7 dwg

FIELD: construction.

SUBSTANCE: device comprises a body made in the form of a semi-cylinder and a well. The body is separated by perforated partitions of semi-circular shape with formation of filtering sections between them. With external ends the partitions are connected to a coastal wall, in the middle part of which there is a vertical cylindrical well. The cover is installed on top of sections. Loading baskets are made of a geosynthetic material, have perforated walls that form cells between each other, where a foam polystyrene charge is located. Hinged loops with eyes are fixed on the upper parts of the baskets.

EFFECT: improved efficiency of device operation due to increased extent of water treatment and improved operation conditions.

3 dwg

FIELD: electricity.

SUBSTANCE: fish barrier includes an electronic control unit and a double-row system of electrodes divided into sections. Each row of electrodes combined into half-sections is arranged at the angle to an arriving flow. A section of electrodes comprises two half-sections, one half-section from each row of electrodes. In the first version, a cathode is in turns one of the electrode sections, anodes are all remaining sections of electrodes. In the second version, a cathode is in turns one of the electrode sections, anodes are all remaining sections of electrodes, not adjacent to the cathode one. The produced homogeneous cathode electric field creates a wide deterring zone, which aligns fish away from electrode sections and takes it away from the protected water intake.

EFFECT: improved characteristics of fish departure from a zone of fish barrier coverage due to reduced impact of arriving flow at fish in process of their exit from an electric field created by a device, and higher efficiency of device functioning.

2 cl, 1 dwg

FIELD: electricity.

SUBSTANCE: electric fish barrier includes an electronic control unit (1) and a single-row system of electrodes (2) divided into sections. Each electrode (2) is divided along a vertical line into elements (3) with the help of insulators (4). Sections of electrodes (2) are made of stiff electrodes. Electrodes (2) are made in the form of pipes, bars or flexible electrodes. Flexible electrodes may look like soft bare cables or a chain with a bare strand pulled through chain links, or a chain with a copper tinned mat placed on it. Pulse current from the supply unit (1) is supplied to each separate element of the electrode (2) with the help of a supply cable (5). It is possible to supply voltage of different potential to separate elements of the electrode (2) at different depths.

EFFECT: creation of more even structure of electric field and possibility to adjust intensity of electric field along depth.

1 dwg

FIELD: construction.

SUBSTANCE: intake works fish-protection structure is related to the field of hydroengineering facilities and is used to prevent ingress of roe, larvae, young fish and full-grown fish into the intake works. The structure comprises a water-intake pipe 15, an inlet flow-forming head wall 12, a fish-receiving pod 5, a fish-diverting nozzle 9, an output head wall 11 of the fish-diverting nozzle 9, a curvilinear U-shaped water-receiving chamber 1, chambers-shelters for fish 7. At the inlet of the water-receiving chamber 1 there are coarse garbage-retaining grates 2 installed. Between the curvilinear convex 3 and concave 4 walls of the water-receiving chamber 1 there is the fish-receiving pod 5 installed. The fish-receiving pod 5 is arranged in the form of a vertical curvilinear wall with holes for passage of a part of a fish flow 6 with fish into the chamber-shelter 7. In the centre of the curvilinear concave wall 4 of the water-receiving chamber 1 there is a receiving window arranged with guide blades 8 of the fish-diverting nozzle 9. The fish-diverting nozzle 9 is arranged in the form of a box with water discharge with fish along a pipe 10 towards the outlet head wall 11. The outlet head wall 11 is arranged outside the limits of the water intake action area. The inlet flow-forming head wall 12 is inserted into the curvilinear convex wall 3 of the water-receiving chamber 1. The inlet flow-forming head wall 12 is arranged in the form of radial vertical blades 13. In the space between vertical blades 13 there are inclined guide partitions 14. Partitions 14 forward the flow without fish into a vertical riser of a water intake pipe 15. The pitch 16 between guide partitions 14 reduces top down. At the ends of radial vertical blades 13 there are flexible canopies 17 fixed to divert fish to the fish-receiving pod 5.

EFFECT: higher efficiency of fish diversion back into an intake works.

2 dwg

FIELD: construction.

SUBSTANCE: invention relates to hydraulic engineering, namely, to methods to attract and transfer fish producers via retaining structures to areas of spawning and ongrowing. In the proposed method a fish pass is arranged in the form of a channel 1 of rectangular cross section with a bottom inclination having incomplete transverse partitions 2 or in the form of a tray 3 with a stepped bottom and transverse partitions 4 with swim-in holes 5, forming a row of chambers or pools 6 and falls between them. In some internal transverse partitions 7 of the fish pass the swim-in holes 8 are framed with a flow-generating apron 9. A system of jet-forming nozzles 11 is installed under coverage of the apron 9 in galleries 10. Besides, nozzles 11 are aligned towards an upper reach and are arranged at the angle or in parallel to an axis of a swim-in hole 8. The system of jet-forming nozzles 11 is supplied from distributing headers 12. Water required to generate hydraulic jets 13 is supplied to distribution headers 12 along bypass discharge pipelines. Further a transit water flow 17 is sent from the upper reach to orient fish among chambers or pools 6 of the fish pass. At some inner transverse partitions 7 of the fish pass a system of jet-forming nozzles 11 is connected for swim-in holes 8. At the moment of water outflow via the system of jet-forming nozzles 11 the hydraulic jets 13 are formed. For more efficient full rest of fish moving along the fish pass in the fish pass pool 16, appropriate hydraulic conditions are developed using hydraulic resistance to a transit flow 17, i.e. zones of partially equal pressures 15. Whirlpool zones 18 in tray structures are created for partial rest of fish prior to a rush to overcome a transit flow 17 or swim-in holes 5. Hydraulic conditions supporting full efficient rest of fish moving along a fish pass are developed via sections of a fish pass route having equal length or via sections of a fish pass of different length, besides, in this case the section lengths regularly decrease towards the upper reach.

EFFECT: invention will make it possible to use classic fish passing technologies at medium and high head water developments, eliminating negative impact of water level variation in reaches of a water development and providing for simultaneous free and independent passing of fish into an upper reach of a water development.

3 cl, 3 dwg

FIELD: construction.

SUBSTANCE: fish pass for high-head water development is installed in a water development dam site. The fish pass is arranged in the form of an open staged, inclined or inclined-staged overflow tray 1 of a fish bypass channel, connecting upper and lower water development reaches. Inside the water overflow tray 1 of the fish bypass channel the vertical transverse partitions 2 and 3 are installed with swim-in holes 4 and 5 accordingly. Transverse partitions 2 form fish pass chambers 6, 7, 8, 9, 10 and 11 between each other. Transverse partitions 3 with swim-in holes 5 are framed with flow-forming aprons 12, where systems of jet-forming nozzles 14 are installed under their coverages in galleries 13. At the same time systems of jet-forming nozzles 14 are directed towards the above fish pass chamber and are installed at the angle or in parallel to the axis of the swim-in hole 5. Pairs of near transverse partitions, where in one above transverse partition 3, included into this pair, the swim-in hole 5 is equipped with a system of jet-forming nozzles 14, and on the other below transverse partition 2 from the same pair the swim-in hole 4 without a system of jet-forming nozzles 14, there are fish pass reservoirs created for recreation 15. Fish pass reservoirs for recreation 15 divide the fish pass into sections. Fish pass sections may comprises an identical number of fish pass chambers 6, 7, 8, 9, 10 and 11. Besides, fish pass sections may comprise different numbers of fish pass chambers, moreover, the quantity of chambers in the fish pass section regularly reduces towards the upper reach. Besides, the fish pass sections may form one fish pass flight, creating a single-flight fish pass. Besides, the fish pass sections may form several opposite fish pass flights, creating a multiple-flight fish pass.

EFFECT: improved conditions for attraction of fish into a fish pass and considerable increase in efficiency of its passage from the lower reach of a high-head water development to areas of spawning.

7 cl, 6 dwg

FIELD: construction.

SUBSTANCE: device includes an elastic cloth installed across the flow. The elastic cloth is made as meshed according to shape and size of the flow and is fixed to the frame. The frame is installed on a rotary crosspiece, which has a drive. At the same time the frame comprises a rotary axis parallel to the direction of the flow with the possibility of frame rotation with the elastic cloth perpendicularly to the direction of the flow and fixation of the frame in the necessary position. At the side part of the crosspiece there is a loading cart for removal of dirt.

EFFECT: increased quality of irrigating water treatment, simplified design and reduced energy intensity of treatment.

4 dwg

FIELD: construction.

SUBSTANCE: water intake contains base or platform, housing and trash screen at its ends. The platform if formed and housing is fixed to its upper surface. Then at least one screen is installed so that inner space embodies platform with housing and screens at the bottom of water source. Outlet of the housing is connected to pipeline. Water intake forms half cylinder at the platform. Anchors can fix edges of water intake to the upper surface of platform. The base can have barrier placed at its one end. Each of screens is installed to the platform near the housing and forms half cylinders. Each screen forms inner cavity communicated with inner hollow space of the housing. Each first and second screens contain a lateral wall, closed distal end and open proximal end fixed to the housing. Closed distal ends have end walls. Water intake can have intermediate walls located between inner space of the housing and inner space of screens. In each transient wall there's at least one flow modifier. Flow modifiers together with platform form half cylinder. Water intake can have a collector placed in screens. Screen structure can include ribs located along screen length. It can also have wire located across ribs.

EFFECT: increasing protective efficiency of screens from silts and providing uniformity of flow distribution along surface area of screens.

28 cl, 16 dwg

FIELD: engines and pumps.

SUBSTANCE: method includes installation of a shield controller 4 and a threshold in a channel. The shield controller 4 is installed at the outlet of a transition section 1, placed between supply 2 and transit 3 channels. In the lower part of the shield controller 4 there is a flush hole 5. At the inlet of the receiving chamber there is a flat shield in the form of an overflow threshold with a drive 14 with capability of vertical displacement. Flow energy redistribution is carried out by displacement of the flat shield. A jet-guiding threshold is made from two sections in the form of a curvilinear and rectilinear 18 one in the vertical direction of walls, providing for the jet-guiding system and kinematically connected with the overflow threshold. The curvilinear wall is installed on the axis 13 as capable of rotation. Installation of the jet-guiding system, movable in vertical and horizontal planes and connected with the movable overflow threshold, placed at the side of the lateral wall of the receiving chamber, provides for concentration of sediment flushing in direction of the flushing hole 5 of the shield controller 4 and further into the transit channel 3.

EFFECT: increased reliability in operation by means of lower impact at a control accessory of bottom and suspended sediments contained in water.

5 cl, 4 dwg

FIELD: construction.

SUBSTANCE: system comprises a settling chamber 1 with a flushing gallery placed between the supply 2 and drainage 3 sections of the channel. The chamber is made with rising side slopes 21, in the lower part of which there is an inlet hole 4 of the flushing gallery 5. The system also comprises a centrifugal clarifier made in the form of cylindrical chambers 6 and 7. The bottom of the chamber 6 is made as inclined towards the central flushing hole. The chamber 7 is placed inside the vertical chamber 6. At the inlet to the settling chamber 1 there is a flat sluice gate 23 with a curvilinear screen 24. The flushing gallery 5 adjoins with its inlet to the inlet at the outer side of the cylindrical chamber 6 and is placed inside the chamber 7, equipped by additional nozzles. The second nozzle 13 is made in the form of an attachment 12 with a flow swirler and with development of a directed water flow connected to a source of discharge water pipeline, and is placed as coaxial to the vertical axis of the flushing drainage pipeline. The lower edge of the internal cylindrical chamber 7 is arranged above the bottom of the external cylindrical chamber 6. The inlet end wall of the flushing gallery is equipped with a horizontal screen 20.

EFFECT: simplified design and higher efficiency of water intake protection against ingress of bottom sediments and floating debris.

2 cl, 2 dwg

FIELD: hydraulic equipment, particularly mechanical equipment for hydraulic structures, namely heat power plants, atomic power plants and hydroelectric power plants, to protect underwater structure parts from unauthorized access in supply and discharge channels thereof.

SUBSTANCE: protective grid comprises vertical rods and connecting members. Two-level control system is arranged in the grid. One level comprises two independent signaling circuits. The first circuit is arranged in vertical rods shaped as vertical hollow pipes in which contact signaling means wire provided with sensors is arranged. The sensors are located in upper horizontal pipe of independent section. Wires of contact signaling means and sensors are united to form common cable. Wires of contact signaling means formed in the second circuit are located in two extreme hollow pipes and connected with two or more water sensors located in lower horizontal pipe. Lower horizontal pipe and upper horizontal pipe are communicated with all vertical hollow pipes. Common cable of the first circuit and wires of the second circuit are led out and connected to sound and light alarm of the grid and to operator's console. Another level has portable television probe adapted to perform vision-based monitoring and to determine quantity and qualitative characteristics of detected deformations. The television probe may slide along guiding means, for instance along rings. The grid may be installed in slots of hydraulic structure and may be displaced in horizontal direction by hoisting device. Upper and lower horizontal pipes, as well as vertical hollow pipes may be U-shaped or linear and are formed of round or elongated profile. Connecting member may be formed as solid horizontal plate or have hollow ellipsoid shape adapted to receive additional contact signaling means wires.

EFFECT: increased operational reliability, increased accuracy of deformation location and type.

4 cl, 4 dwg

FIELD: hydraulic engineering.

SUBSTANCE: invention relates to devices for taking water from surface sources and it is designed to provide protection of diversion facilities from slush ice. Proposed device contains three-dimensional filtering cassettes installed in guide of slot structure of intake port of submerged water intake head of diversion facility consisting of metal rectangular frame with filtering plastic tubes tightly fitted in slots on inner side. Plastic tubes are made truncated along their generatrices on secant line of base of corresponding filtering plastic tube. Chord of secant line of base of filtering plastic tubes is either equal to or non- equal to outer diameter of tubes, and dimensions of metal rectangular frame are multiple of said chord. Truncated filtering plastic tubes can be installed in metal rectangular frame in slots on inner side, either vertically or horizontally, being interconnected by hydraulic insulating material.

EFFECT: provision of effecting protection of diversion facilities from slush ice.

4 cl, 2 dwg

The invention relates to the field of hydraulic engineering and can be used for protection of waterworks and pumping stations from plant residues and floating debris

The invention relates to a device for producing or collecting water from surface water sources to protect water intakes from falling sludge

The invention relates to techniques for mechanical wastewater treatment and can be used in urban water supply and sewage farms and enterprises with self-contained sewage treatment

FIELD: agriculture.

SUBSTANCE: invention relates to a device for light catching fish, squid and other hydrobionts. The purse comprises a frame with a net cone fixed on it, an electric cable, straps, lifting and lowering ropes. The frame is made in the form of a rectangle divided in the middle part with the beam on which the light source is fixed. When lifting the purse the frame halves turn upwards relative to the beam and converge.

EFFECT: invention enables to fish a greater volume of water and to lift the purse faster.

3 cl, 1 dwg

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