SU1751048A1 - Pulsating water-jet propeller - Google Patents

Abstract

Use: for ship thrusters with a working body open at both ends of the channel. The essence of the invention: a pulsating jet engine contains a channel 1, inside of which two pairs of plates hingedly connected to each other along the leading edge, mounted with the possibility of reciprocating movement

Description

FIG g

along the longitudinal axis of the channel in antiphase. Nasal and stern elastic clamps 26 are installed in the channel, and longitudinal guides 20 with carriages installed in them are installed on its side walls. Each

the pair of plates is made with struts 21 that are hingedly connected with carriages, which are installed with the possibility of alternating interaction with the bow and stern elastic locks. 8 il.

The invention relates to ship propulsion devices with an operating member oscillating in the open at both ends} channel and is intended to improve propulsion characteristics of the propulsion unit.

A device is known for improving the liquid-pushing mechanism consisting of two pairs of plates that have the ability to make angular movements relative to the carriages to which they are attached by side edges by means of linear hinges, and the carriages have the ability to make reciprocating in antiphase along the guide . Such plates have the ability to rotate relative to the hinges in such a way that, during the working stroke, they are positioned so that their opening angle is close to 180 °, and at idle, to 0 °.

However, the opening and folding of the plates relative to each other depends only on the speed of their movement along the longitudinal axis, i.e., on the magnitude of the velocity head, occurs for some (sometimes long) time and thereby reduces the integral tractive characteristic of the propeller.

The purpose of the invention is to increase the efficiency of the engine by minimizing the time of opening and closing of each pair of plates in any mode of operation at the beginning and end of each working stroke.

The goal is achieved by the fact that a propeller containing a channel within which two pairs of plates are hinged to each other along the leading edge and having the possibility of reciprocating movement along the longitudinal axis of the channel in antiphase, is additionally equipped with fore and aft elastic clamps installed in a channel, longitudinal guides placed on the side walls of the channel, and carriages, and each pair of plates is made with braces hingedly connected with carriages which are mounted longitudinal guide with the possibility of reciprocating movement, and

variable interaction with bow and stern elastic clamps.

FIG. 1 and 2 shows the general arrangement of the elements of the propeller; in fig. 3, section A-A in FIG. one; in fig. 4 is a section BB in FIG. 3; in fig. 5 is a perspective view of the plate opening and closing mechanism; section BB in FIG. 3; in fig. 6 is a cross-section of the FIG. five; in fig. 7 - section DD in FIG. five;

in fig. 8 diagram of the force of gi developed by the first (a) and second (b) plate gauges and the propulsion unit as a whole (c) during the full working cycle.

Pulsating jet propulsion

(Fig. 1, 2) consists of channel 1, in which two pairs of plates 2 and 3 are placed, and connected to channel 1 by brackets 4 of the aggregate compartment 5, in which linear brackets 8 and 9 are placed on brackets b and 7.

In addition to the brackets 4, the stiffness of the channel 1 is provided by struts 10 and 11. The first pair of plates 2 is pivotally connected along the front faces of the plates by an axis 12 (Fig. 3) rigidly fixed to the sliding support 13. The translation of the pair of plates 2 is carried out by the attached rigidly to the axis 12 of the U-shaped stem 14 from the actuator 8. A second pair of plates 3 are connected pivotally along the front edges by an axis 15 rigidly fixed to the end of the stem 16, which is driven in translational motion by the actuator 9. The stem 16 supports the sliding bearing 17, fixed

inside channel 1 by struts 10.

Axes 12 and 15 at the ends have carriages 18 with four wheels 19 on each of them (Fig. 5) mounted on guide elements 20 located along the side walls of channel 1. Each working plate has two braces 21 attached to it through the hinge 22 and providing the opened or closed position of the plates 2 and 3. The struts 21 are fixed in pairs with the other end on the semi-axes 23 attached at one end to the carriages 24 with the same wheels 19 with the possibility of movement along the guides 20 (Fig. 6). On carriages 24 perpendicular to it.

The planes between the upper and lower pairs of wheels 19 are installed in two plates 25, which serve as supporting elements for elastic clamps, arranged in pairs symmetrically to the guide 20 along the side walls of channel 1 at the beginning and end of the stroke of each pair of plates and consisting of spring-loaded fingers 26 attached to the vertical axis 27 to the side walls of the housing 1 and the covers 28 closed on the outside. The fingers 26 are spring-loaded in the direction of the longitudinal axis of the channel on both sides by the springs 29 (FIG. 7).

The device works as follows.

FIG. 1 shows the relative positioning of the driving elements at the moment when the idle stroke of the pair of plates 2 is completed and the stroke of the pair of plates 3 is completed. At the end of the stroke of both pairs of plates, the supporting elements 25 with a force far exceeding the stiffness of the springs 29 of the fingers 26, forced the fingers 26 to turn around axis 27, passed on and freed fingers 26, which returned to their original position.

The next moment, the rod 16 begins to move forward (to the output section of the housing 1), and the rod 14 - back. The axis 12 of the pair of plates 2 moves forward, and the semi-axes 23 of the struts 21 are fixed at this time, because at this time the pressure force on the fingers 26 is less than the stiffness of the springs which are pressing them 29. Due to this, the distance between the axis 12 and the semi-axes 23 decreases, the plates 2 and the struts 21 are rotated relative to each other around the axis of the hinge 22 and the plates 2 are opened to the working position (up to the maximum angle between them). The maximum angle of rotation of the strut 21 relative to the plate 2 is limited by the stop 30.

When a mutual rotation of the plate 2 and the strut 21 around the hinge 22 (the plates 2 are in the working position) is completed, the pressure of the plates 25 on the fingers 26 increases and exceeds the rigidity of the springs raising them 29, the fingers 26 turn, and the plates 2 are in working (maximum open) the position is made a working stroke, at the end of which the plates 25 are also fixed in the final position by the fingers 26 (Fig. 2).

When the rod 14 moves backward, the plates 25 of the second pair of plates 3 are fixed with spring-loaded fingers 26 (FIG. 1). The distance between the axis 15 of the plates 3 and the axes of the 23 braces 21 attached to the plates 3 increases and occurs

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reciprocal rotation of the plate 3 and the struts 21 relative to each other around the axis of the hinge 22 until the angle between the plates 3 is minimized. Upon further movement of the axis 15 backwards, the possibility of reciprocal rotation of the plates 3 and the struts 21 is no longer possible, the entire pressure force from the rod 14 acts through the plates 25 on the fingers 26 of the elastic clamps and they, turning around the axis 27, allow a pair of plates 3 in the maximum closed position to continue idling to the position shown in fig. 2

The change in the magnitude of the pull force of the P of one pair of plates during one cycle is shown in FIG. 8, a (a pair of plates 2) and in FIG. 8, b (a pair of plates 3). At the beginning of the working stroke, the plates are opened to the working position, as a result of which the position of the working element of the propeller increases; upon further movement of the rod of the plate with some velocity V, the mass of water t moves along the channel, together the impulse P mV. At the moment of stopping the plates at the end of the working stroke, the pull of the cable P disappears and resistance R appears, which decreases as the plates are folded and keeps constant when the rod and plates move backwards. A similar pattern of changes in P and R in the second pair of plates 3, but with a phase shift by l.

The real picture of the change in the force of the gig of a two-plate propulsion unit is shown in FIG. 8, in, where PCp - average tons of pulsating jet propulsion for one full cycle of oscillations of the working elements.

Thus, during an oscillatory cycle, in which the axis of a pair of plates makes a forward movement back and forth, the propulsion, by overlapping the idling of one pair of plates by the working stroke of another pair of plates, provides a full thrust momentum for about 80% of the cycle time. Placing elastic clamps on the channel walls of the propeller at the beginning and end of each pair of plates makes it possible to minimize the time of maximum opening of the working plates at the beginning of the working stroke and the time of complete maximum possible (by structural conditions) folding of the plates at the beginning of idling.

The proposed device provides, in comparison with the known, an improvement in the propulsive characteristics of the propeller by minimizing the opening and closing times of two pairs of working plates in the extreme parts of the stroke of their drive rod when they are in antiphase.

Claims (1)

Invention Pulsating jet propulsion device comprising a channel within which two pairs of plates hingedly connected to each other along the leading edge are installed with the possibility of reciprocating movement along the longitudinal axis of the channel in antiphase, in order to increase the efficiency of the driver minimize the time to open and close a pair of plates in any mode of operation at the beginning FIG. 7 0 and the end of each working stroke, the propeller is equipped with fore and aft elastic clamps installed in the channel, longitudinal guides, placed on the side walls of the channel and carriages, and each pair of plates is made with struts hinged to the carriages with the possibility of reciprocating movement and alternating interaction with the bow and stern elastic clamps, 2.6 /// 1516 ZP Fin 3  53 Ti h one G s 1 O. & AZ with; " U Working stroke Idling 23 FIG. 7 u Chastity move Radar course