Staroverov's propeller screw

FIELD: transport.

SUBSTANCE: propeller screw assembly comprises two propeller screws running in opposite directions. One propeller screw features smaller diameter but runs at higher angular velocity and has larger number of blades.

EFFECT: higher efficiency, lower noise.

2 cl

 

The invention relates to propellers.

Known propeller containing the hub and the blades, see, for example, "Crew boat", Hrader, Sudostroenie, Leningrad, 1977, s. To improve the efficiency of the screw is also used with coaxial screws, see log for "Boats and yachts" No. 187, p.34. But in a pair of coaxial screw the first screw throws water at a certain speed, and the second even more increases the speed drop of water. And this is disadvantageous from the point of view of creating thrust - as we know from the law of conservation of momentum, it is more profitable to drop as much weight water with the least-possible speed. But in coaxial screws have a reserve increase efficiency. As you know, the propeller creates thrust mainly by the ends of the blades (basal 50% of the screw creates only 6% of the total thrust, i.e. they are only in vain spin the water flow). That is, the internal, from about 0.7 diameter portion of the drive screw throws water weakly.

The objective of the invention is the increased efficiency of the screw. This is a technical result of the invention, it is also expected noise reduction screw.

For this, the screw having two rotating side of the propeller, has one screw of smaller diameter, but rotating with an angular velocity (with approximately the same speed of the ends of the blades). This screw constructs in the outlet stream of water with approximately the same speed. It eats the mass of a drop of water at the same diameter of the screw increases, and thus, increases efficiency, and thrust.

To reactive moments both screws were the same, preferably (but not necessarily)to a smaller screw had a greater number of blades.

The smaller screw is preferably positioned behind (relative to the direction of thrust) large screw to limit vortices with his blade did not break the flow of the large blades of the screw. Of course, it is calculated based on flow from the first screw and taking into account the spin flow.

This screw can be used as a pusher, and can be used as a pull. To drive more screws such a propeller is convenient to use a planetary gear with a stationary satellites. The smaller screw on the small boats can be driven directly from the motor. In this case, the efficiency is increased because a large screw is driven through the reduction gear, which, as is known, increases its efficiency. Perfect when such gear is with the engine one.

Possible that the two screws are driven by two identical motors: a smaller screw - directly and more through dvuhsistemnaya gear with a speed of 1.4-1.6 times smaller. Twin engine installation will increase the reliability of the vessel.

If to drive the vessel used gas turbine engine, the twin-shaft gas turbine engine this is poluchaetsya even easier - designed so that the inner shaft is rotated in one direction, and another 1.5 times slower.

Example: suppose that the propeller has one two-bladed propeller with a diameter of 100%. And the second rotating propeller, 1.5 times faster, has 3 blades of the same width, but the diameter of 66.7%. In this case, the reactive moments will be equal.

It is possible that a large screw contains 3 blades, and the smaller 4-5 blade diameter of 65-75% (it is at this range it is necessary to design future screw). If a large screw contains 4 blades, the smaller must contain best 7 blades.

1. Propeller having two rotating side of the propeller, characterized in that it has one screw of smaller diameter, but rotating with an angular velocity.

2. The screw according to claim 1, characterized in that the lower screw has a greater number of blades.



 

Same patents:

FIELD: transport.

SUBSTANCE: invention relates to machine building and may7 be used in vehicles driven and air screw. Biplanetary drive with ring gear made up of paired epicycle 3 is fitted in bearing 2 inside housing 1. Receiving section of epicycle 3 comprises epitrochoid working shape 4 outlined by vertices of triangular rotor 5. Crank 6 arranged off-center relative to sun ledge 7 with its axis aligned with ring gear center is arranged in rotor and aligned therewith. Radii of said sun ledge and crank relate as 2:3. Eccentricity equals half the radius of said ledge 7. Second part of ring gear represents inner gearing rim and comprises set of plane pinions coupled by central gear with sun ledge 7 and combined by drive carrier. Axial extensions of sun ledge 7 and ring gear comprise internal and external air screws, respectively.

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FIELD: water transport facilities.

SUBSTANCE: proposed sea-going ice-breaking transport vessel has hull with keel, forecastle with deck house, fore pointed extremity, aft convex cochleariform lines, aft deck and propulsion-and-steering gears. Hull is additionally provided with flat bulb considerably projecting beyond fore perpendicular. Fore lines are made with U-shaped frames over entire height of side including forecastle superstructure with streamlined deck house; keel is rising in sternpost area; when it is stowed, its lower aft wedge-shaped edge projects beyond sternpost line. Aft cochleariform lines form section of deck which is oval in plan with transom inclined at angle of 45 deg. In underwater portion, lines smoothly change into side bulges-sponsons provided with passageways with longitudinal slots in their bottom part for motion of propulsion-and-steering gears over them. Side bulges-sponsons terminate in falling-out side on external side and falling-home side in their fore part so that line of maximum breadths in this area directed upward and sternward should cross the waterline at angle of 3-6 deg. Extreme breadth of hull over bulges-sponsons in the waterline area exceeds midship breadth. Bottom part of passageway has horizontal or slightly deadrise surface in cross-sections which passes to stern at angle of 1-3 deg. relative to waterline and extends to deck at angle of 45 deg. On both sides of its oval section made in form of shoulder perpendicular to hull CL. Propulsion-and-steering gear includes two all-moving struts with nacelles located in aft section of ship, motors in nacelles for rotating the propellers and load-bearing service lines running to struts from power module of vessel. Struts with nacelles are located on both parts of stern in bulges-sponsons. Each strut with nacelle has streamlined guide stud in form of spherical segment with base directed upward which is equipped with circular thrust sliding bearing over its perimeter; each strut has vertical shaft which is coaxial with segment and is rotated by motor in radial-thrust bearing of carriage located in passageway of bulge-sponson and driven by means of load-bearing service lines on four bevel gear wheels connected in pairs by means of transversal hydraulic cylinders of carriage and driven by hydraulic motors built in them; hydraulic motors are thrown into engagement with inclined toothed racks laid on either side from slot in bottom part of passageway. Width of this slot is equal to diameter of vertical shaft.

EFFECT: enhanced ice passability of vessel.

3 cl, 7 dwg

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The invention relates to shipbuilding, particularly for outboard motors

FIELD: water transport facilities.

SUBSTANCE: proposed sea-going ice-breaking transport vessel has hull with keel, forecastle with deck house, fore pointed extremity, aft convex cochleariform lines, aft deck and propulsion-and-steering gears. Hull is additionally provided with flat bulb considerably projecting beyond fore perpendicular. Fore lines are made with U-shaped frames over entire height of side including forecastle superstructure with streamlined deck house; keel is rising in sternpost area; when it is stowed, its lower aft wedge-shaped edge projects beyond sternpost line. Aft cochleariform lines form section of deck which is oval in plan with transom inclined at angle of 45 deg. In underwater portion, lines smoothly change into side bulges-sponsons provided with passageways with longitudinal slots in their bottom part for motion of propulsion-and-steering gears over them. Side bulges-sponsons terminate in falling-out side on external side and falling-home side in their fore part so that line of maximum breadths in this area directed upward and sternward should cross the waterline at angle of 3-6 deg. Extreme breadth of hull over bulges-sponsons in the waterline area exceeds midship breadth. Bottom part of passageway has horizontal or slightly deadrise surface in cross-sections which passes to stern at angle of 1-3 deg. relative to waterline and extends to deck at angle of 45 deg. On both sides of its oval section made in form of shoulder perpendicular to hull CL. Propulsion-and-steering gear includes two all-moving struts with nacelles located in aft section of ship, motors in nacelles for rotating the propellers and load-bearing service lines running to struts from power module of vessel. Struts with nacelles are located on both parts of stern in bulges-sponsons. Each strut with nacelle has streamlined guide stud in form of spherical segment with base directed upward which is equipped with circular thrust sliding bearing over its perimeter; each strut has vertical shaft which is coaxial with segment and is rotated by motor in radial-thrust bearing of carriage located in passageway of bulge-sponson and driven by means of load-bearing service lines on four bevel gear wheels connected in pairs by means of transversal hydraulic cylinders of carriage and driven by hydraulic motors built in them; hydraulic motors are thrown into engagement with inclined toothed racks laid on either side from slot in bottom part of passageway. Width of this slot is equal to diameter of vertical shaft.

EFFECT: enhanced ice passability of vessel.

3 cl, 7 dwg

FIELD: transport.

SUBSTANCE: propeller screw assembly comprises two propeller screws running in opposite directions. One propeller screw features smaller diameter but runs at higher angular velocity and has larger number of blades.

EFFECT: higher efficiency, lower noise.

2 cl

FIELD: transport.

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EFFECT: implementation of invention permits to lower hydraulic resistance of auxiliary propulsion system and to increase its overall thrust.

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FIELD: transport.

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EFFECT: higher reliability, decreased weight and overall dimensions, lower level of interferences at power conversion.

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EFFECT: higher efficiency, reduced weight and dimensions of the propulsion motor, increased capacity and capacity of ship is achieved.

2 cl, 4 dwg

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