BG64380B1 - Propeller - Google Patents

Abstract

The propeller is designed for propeller mechanisms used in the shipbuilding and the aircraft engineering, as well as for residential needs. It allows a change in the streamlining of the ends of the blades and their interaction with the fluid flow. It consists of a hub (2) resting in housing (1) with fixed blades (3) with central cavities (4) connected to an intake device. In the radial ends (7) of the blades (3) slots (8) are machined along the length of the blades (3). Slots (8) are inclined at an angle alpha in the direction of the revolutions of the hub (2) and at angle beta in the direction of the movement of the housing (1). The intake device (6) is reversible. Blades (3) have a front (9) and a rear (10) wall.

Description

Technical field

The invention relates to a propeller intended for propeller machines, in particular for vessels in fluid environments.

BACKGROUND OF THE INVENTION

A propeller is known, consisting of a hub bearing in a housing with fixed blades having cavities which are connected via a chamber with a discharge device. There are tangential slots in the posterior edge of the scapula associated with the scapula cavities.

The propeller rotates from the fluid jets flowing from the back edges of its blades / 1 /.

This solution makes it impossible to change the flow at the radial end of the blades and the associated vortices and their interaction with the fluid medium.

It is an object of the invention to provide a propeller with the possibility of changing the flow at the radial end of the blades.

SUMMARY OF THE INVENTION

The problem is solved by a propeller comprising a hub bearing in the housing with fixed blades with cavities connected via a chamber with a pressure device. According to the invention, in the radial edges of the blades are formed slots connected to the cavities and inclined at an angle a and β in longitudinal sections, passing respectively through the thickness and width of the blades, the discharge device is reversible (becomes suction) and is located in a central opening of the hub, which has an auxiliary propeller, which is fixedly connected to the drive reverse shaft.

The advantage of the invention is the ability to change the flow of the radial edges of the blades and their interaction with the fluid medium (flow) by suction or injection of fluid through the slots of the blades.

Description of the attached figures

Figure 1 is a longitudinal section of the propeller;

2 is a view of A in FIG. 1; FIG. 3 is a sectional view along the CC of FIG. 2; FIG. 4 is a view of the shoulder blade in FIG. 2;

5 is a cross-sectional view of the MM-blade of FIG. 2 for two cameras;

6 is a longitudinal sectional view of the propeller in another embodiment;

7 is a longitudinal sectional view of the propeller in another embodiment;

8 is a cross-sectional view of the scapula on C-C with the curved back wall of the scapula;

9 is a sectional view along the C-C of the blade with a shortened front wall of the blade.

Examples of carrying out the invention

The propeller consists of a hub 2 enclosed in housing 1 with fixed blades 3 having central cavities 4 connected via a chamber 5 to a discharge device 6. In the radial ends 7 of the blades 3, slots (8) are connected to the cavities 4 and inclined at an angle a and β in the longitudinal sections of the blades 3, passing respectively through the thickness and width B of the blades 3. The discharge device 6 is reversible (also works as a suction) and is located in the central opening of the hub 2, and has an auxiliary propeller 11, connected immobile to the propulsive roar ruffle shaft 12.

In FIG. 5 shows a blade 3 with a cavity 4 separated by a longitudinal rib 13 into two parallel chambers 14 and 15. One chamber 14 is connected to a suction device 6 operating in suction mode and the other chamber 15 is connected to a second pump device.

In FIG. 6, small openings 23 are formed in the area of the slots 8, small openings 23 are formed in the front 9 and rear 10 walls of the blade 3.

In the exemplary embodiment shown in FIG. 7, the discharge device comprises a front fluid flow 16 passing through the axis of the hub 2 in contact with the blade nozzles 17 which are connected to the cavities 4 of the blades 3.

In the exemplary embodiment shown in FIG. 8, at the end of the blade 3, its rear wall 10 is bent in the direction of the front 9, whereby the slit angle 8 is changed.

In the exemplary embodiment shown in FIG. 9, the front wall 9 of the Zee blade is less than its rear wall 10.

In another embodiment, the auxiliary propeller shaft 12 is stationary relative to the housing 1, and, alternatively, the auxiliary propeller shaft is stationary relative to the hub 2.

Use of the invention

As the propeller rotates, its blades 3, through their front walls 9, create an axial thrust. During operation of the device 6 in suction mode, a fluid suction is reduced through the slots 8 of the blades 3, reducing the vorticity and cavitation when the blades flow 3. This reduces the resistance to rotation at the edges of the blades 3 and improves the filling of the interstitial fluid fluid. When the device 6 is operated in pressure mode, the diametrical zone of impact of the propeller is increased by 8 fluid jets flowing through the slits. The design of the propeller allows the device 6 to be rapidly switched from suction to injection mode and vice versa by changing the direction of rotation of the auxiliary propeller 11.

In the bent rear wall 10 to the front 9 of the blade 3, a different angle of inclination of the slit 8 and the fluid stream flowing through it is achieved.

As shown in FIG. 7, the structure of the device 6, the fluid stream 16 directed to the outlet of the hub 2 is sucked in by the blade nozzles 17 fluid from the cavities 4 of the blades 3.

As shown in FIG. 5 blade 3 with two chambers 14 and 15, one of them can be operated in the suction mode and the other in the discharge mode. Alternatively, both chambers 14 and 15 may operate in the same mode with the same or different intensities.

Claims (1)

Claims A propeller including a hub bearing a hub with attachment blades therein, having central cavities connected via a chamber with a discharge device, characterized in that slots (8) are formed at the radial ends (7) of the blades (3), connected to the cavities (4) and inclined at an angle a and β in longitudinal sections of the blades (3), passing respectively through / the thickness and width (B) of the blades (3), the discharge device (6) being reversible (working and as suction) and is located in a central hole of the hub (2), with a propeller (11) rigidly connected to a drive reverse shaft (12). Attachment: 9 figures Literature