Semi-suspended stator pump-jet propeller

Abstract

The invention provides a semi-suspended stator pump-jet propeller. The semi-suspended stator pump-jet propeller comprises a guide pipe, a hub, paddles, full-stator blades and semi-suspended stator blades. The hub, the paddles, the full-stator blades and the semi-suspended stator blades are positioned in the guide pipe; the hub and the guide pipe are coaxially arranged, the blades and the full-stator blades are arranged on the outer wall of the hub, the full-stator blades are arranged in the front, and the blades are arranged in the rear; one end of each full-stator blade is fixedly connected with the outer wall of the hub, and the other end of each full-stator blade is fixedly connected with the inner wall of the guide pipe; the semi-suspended stator blades are arranged between the full stator blades, the semi-suspended stator blades are arranged on the inner wall of the guide pipe and extend in the radial direction from the inner wall of the guide pipe to the hub, and the semi-suspended stator blades are arranged between the full stator blades, so that the vortex strength in the area from the rear of the front full stator blades to the front of the blades is changed, and energy dissipation is increased; the vortex intensity of the position behind the semi-suspended stator blade is reduced, the flow field distribution is more uniform, and the efficiency is improved and the flow noise is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of pump-jet thrusters, and specifically, to a semi-suspended stator pump-jet thruster. Background Art

[0002] In recent years, due to the influence of the international situation and national development, countries around the world have gradually increased their attention to marine resources and the investment in related marine equipment has also been increasing day by day. China has also carried out projects such as "Key Technologies and Equipment for Deep Sea" and "Key Technologies for Deep and Far Sea Nuclear Power Platforms". As one of the key fields of marine equipment, the thruster determines the mobility, stealth and other performances of related equipment, and has an important impact on the development of fields such as resource development and military defense.

[0003] The pump-jet thruster mainly consists of an axisymmetric duct, stationary guide vanes (stators) and a rotating impeller (rotor). Compared with traditional propulsion methods, it has the advantages of high propulsion efficiency and low radiation noise. At present, the pump-jet thruster mainly has two structures: a front stator and a rear stator. The front stator can improve the inlet flow field of the thruster, which is beneficial to reducing the flow noise of the thruster and has been applied to submarines such as the "Virginia class" and the "Seawolf class". The radiation noise of the thruster is one aspect of the performance requirements, and the influence of performances such as thrust on the thruster is also crucial.

[0004] The patent document with the publication number CN110104154A discloses a pump-jet thruster, which includes a duct, a stator, a rotor, a hub, a rotating shaft and a deflector. The hub, the rotor, the stator and part of the rotating shaft are located inside the duct; the hub and the rotor are sequentially sleeved on the rotating shaft, and the rotating shaft can drive the rotor to rotate; the stators are evenly and spacedly distributed between the hub and the duct, one end of the stator is connected to the hub, and the other end of the stator is connected to the duct; the deflector is located on the side of the rotor away from the hub, and the deflector is connected to one end of the rotating shaft. The rotor, the hub, the rotating shaft and the deflector are coaxial, which improves the efficiency of the thruster, but the structure of the flow-through components is complex, increasing the occurrence location of radiation noise.

[0005] The patent document with the publication number CN109987210A discloses a bionic pump-jet thruster, which imitates the serrated structure at the trailing edge of an owl's wing and redesigns the duct and stator parts of the pump-jet thruster, cutting out a serrated structure at its trailing edge. After the structure of the thruster is changed, although it is beneficial to reduce noise, it is necessary to generate densely distributed serrated grooves at the tail of the duct and the stator, and the design process is complex and the manufacturing process is difficult to implement.

[0006] In view of the above deficiencies, based on the traditional front stator pump-jet thruster, the present invention proposes a suspended stator blade that is distributed between the blades of the stator, starts from the inner wall of the duct, and extends towards the hub direction. It has a simple structure, is relatively convenient to manufacture and install, can improve the flow field inside the thruster, reduce the energy conversion caused by vortices, and thus improve the stealth and working performance of the underwater vehicle. Summary of the Invention

[0007] Aiming at the defects in the prior art, the object of the present invention is to provide a semi-suspended stator pump-jet thruster.

[0008] A semi-suspended stator pump-jet thruster according to the present invention includes a duct, a hub, blades, full stator blades, and semi-suspended stator blades;

[0009] The hub, blades, full stator blades, and semi-suspended stator blades are located inside the duct;

[0010] The hub and the duct are coaxially arranged. The blades and the full stator blades are both arranged on the outer wall of the hub. The full stator blades are in the front, and the blades are in the rear;

[0011] One end of the full stator blade is fixedly connected to the outer wall of the hub, and the other end of the full stator blade is fixedly connected to the inner wall of the duct;

[0012] The semi-suspended stator blades are arranged between the full stator blades. The semi-suspended stator blades are arranged on the inner wall of the duct and extend radially from the inner wall of the duct towards the hub direction.

[0013] Preferably, the angles of the semi-suspended stator blades with respect to the two adjacent full stator blades on both sides are equal.

[0014] Preferably, the semi-suspended stator blades and the full stator blades are relatively fixed on the inner wall of the duct.

[0015] Preferably, the maximum axial length of the semi-suspended stator blades is equal to the length of the full stator blades.

[0016] Preferably, the cross-section of the hub where the leading edge vertex of the semi-suspended stator blade is located and the cross-section of the hub where the leading edge vertex of the full stator blade is located are the same cross-section, and the cross-section is perpendicular to the rotation axis center line of the hub.

[0017] Preferably, the full stator blades are evenly arranged on the outer wall of the hub.

[0018] Preferably, the semi-suspended stator blades are evenly arranged on the inner wall of the duct.

[0019] Preferably, the number of the semi-suspended stator blades is N, and N is a natural number greater than or equal to 2.

[0020] Preferably, the duct is of a conical structure, the full stator blades are arranged at the large end position of the conical structure, and the blades are arranged at the small end position of the conical structure.

[0021] Preferably, the hub is of a hollow structure, and a support bearing is arranged inside the hub for supporting the rotating shaft.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. By arranging semi-suspended stator blades between the full stator blades, the suspended stator blades extending from the inner wall of the duct towards the hub change the vortex intensity in the area from behind the front full stator blades to in front of the blades, increase the energy dissipation, reduce the vortex intensity at this position behind the semi-suspended stator blades, and make the flow field distribution more uniform, which is beneficial to improving the efficiency and reducing the flow noise.

[0024] 2. By adding semi-suspended stator blades on the basis of the full stator blades, the present invention reduces the turbulence intensity of the wake in the stator area, improves the flow field distribution, and is beneficial to improving the efficiency and reducing the flow noise.

[0025] 3. The present invention is adjusted without changing the structure and method of the traditional pre-stator pump-jet propeller, has a simple structure, and is more convenient to manufacture and install compared with some bionic structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Other features, objects, and advantages of the present invention will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0027] Figure 1 is a schematic structural diagram of a semi-suspended stator pump-jet propeller;

[0028] Figure 2 is a schematic structural diagram of a semi-suspended stator pump-jet propeller;

[0029] Figure 3 is a schematic diagram of the arrangement of semi-suspended stators and full stators;

[0030] Figure 4 is a schematic diagram of the arrangement of semi-suspended stators and full stators.

[0031] As shown in the figure:

[0032] Duct 1 Full stator blade 4

[0033] Hub 2 Semi-suspended stator blade 5

[0034] Blade 3 DETAILED DESCRIPTION OF THE INVENTION

[0035] The present invention will be described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several changes and improvements can still be made. These all belong to the protection scope of the present invention.

[0036] As Figure 1 and 2 shown, a semi-suspended stator pump-jet thruster provided according to the present invention includes a duct 1, a hub 2, blades, full stator blades 4, and semi-suspended stator blades 5. The hub 2, the blades 3, the full stator blades 4, and the semi-suspended stator blades 5 are all located inside the duct 1. The hub 2 and the duct 1 are coaxially arranged. The blades 3 and the full stator blades 4 are both arranged on the outer wall of the hub 2. The full stator blades 4 are arranged in the front, and the blades 3 are arranged in the rear. One end of the full stator blades 4 is fixedly connected to the outer wall of the hub 2, and the other end of the full stator blades 4 is fixedly connected to the inner wall of the duct 1. The semi-suspended stator blades 5 are arranged between the full stator blades 4, and the semi-suspended stator blades 5 are arranged on the inner wall of the duct 1 and extend radially from the inner wall of the duct 1 towards the hub 2.

[0037] For the present invention, the structures and installation methods of the duct 1, the hub 2, and the blades 3 of the front pump-jet thruster remain unchanged. The stator structure is redesigned. The semi-suspended stator blades 5 are arranged between the full stator blades 4. The suspended stator blades starting from the inner wall of the duct 1 and extending towards the hub 2 change the vortex intensity in the area from the rear of the front full stator blades 4 to the front of the rear blades 3, increase the energy dissipation, reduce the vortex intensity at this position behind the semi-suspended stator blades 5, and make the flow field distribution more uniform, which is beneficial to improving the efficiency and reducing the flow noise. The present invention does not change the structure and method of the traditional front stator pump-jet thruster, which is convenient for adjustment on this basis. The structure is simple, and compared with some bionic structures, it is more convenient for manufacturing and installation.

[0038] Specifically, as Figure 2 shown, the duct 1 is a conical structure. The full stator blades 4 are arranged at the large end position of the conical structure, and the blades 3 are arranged at the small end position of the conical structure. The hub 2 is a hollow structure, and a support bearing is arranged inside the hub 2 to support the rotating shaft.

[0039] Specifically, as Figure 3 and 4As shown, the full stator blades 4 include M pieces, where M is a natural number greater than or equal to 2, and the full stator blades 4 are evenly arranged on the outer wall of the hub 2. The semi-suspended stator blades 5 include N pieces, where N is a natural number greater than or equal to 2, and the semi-suspended stator blades are evenly arranged on the inner wall of the conduit 1. Between the full stator blades 4, with the center of the hub 2 as the origin, the semi-suspended stator blades 5 are evenly arranged circumferentially. The semi-suspended stator blades 5 and the full stator blades 4 are relatively fixed on the inner wall of the conduit 1. The angles of the semi-suspended stator blades 5 from the two adjacent full stator blades 4 are equal. The maximum axial length of the semi-suspended stator blades 5 is equal to the length of the full stator blades 4. The cross-section of the hub 2 where the leading edge vertex of the semi-suspended stator blades 5 is located and the cross-section of the hub 2 where the leading edge vertex of the full stator blades 4 is located are the same cross-section, and the cross-section is perpendicular to the rotation axis centerline of the hub 2. The semi-suspended stator blades 5 radially extend from the conduit 1 towards the hub 2, and the extending direction is the same as the radial length direction of the full stator blades 4, and the extending length is subject to the requirements of specific working conditions.

[0040] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0041] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. Without conflict, the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other.

Claims

1. A semi-suspended stator pump-jet propeller, characterized in that, it includes a duct (1), a hub (2), blades (3), full stator blades (4) and semi-suspended stator blades (5); the hub (2), the blades (3), the full stator blades (4) and the semi-suspended stator blades (5) are located inside the duct (1); the hub (2) and the duct (1) are coaxially arranged, the blades (3) and the full stator blades (4) are both arranged on the outer wall of the hub (2), the full stator blades (4) are arranged in front, and the blades (3) are arranged behind; one end of the full stator blade (4) is fixedly connected to the outer wall of the hub (2), and the other end of the full stator blade (4) is fixedly connected to the inner wall of the duct (1); the semi-suspended stator blades (5) are arranged between the full stator blades (4), and the semi-suspended stator blades (5) are arranged on the inner wall of the duct (1) and radially extend from the inner wall of the duct (1) towards the hub (2).

2. The semi-suspended stator pump-jet propeller according to claim 1, characterized in that, the angles of the semi-suspended stator blades (5) from both adjacent full stator blades (4) are equal.

3. The semi-suspended stator pump-jet propeller according to claim 1, characterized in that, the semi-suspended stator blades (5) and the full stator blades (4) are relatively fixed on the inner wall of the duct (1).

4. The semi-suspended stator pump-jet propeller according to claim 1, characterized in that, the maximum axial length of the semi-suspended stator blades (5) is equal to the length of the full stator blades (4).

5. The semi-suspended stator pump-jet propeller according to claim 1, characterized in that, the cross-section of the hub (2) where the leading edge vertices of the semi-suspended stator blades (5) are located and the cross-section of the hub (2) where the leading edge vertices of the full stator blades (4) are located are the same cross-section, and the cross-section is perpendicular to the rotation axis center line of the hub (2).

6. The semi-suspended stator pump-jet propeller according to claim 1, characterized in that, the full stator blades (4) are evenly arranged on the outer wall of the hub (2).

7. The semi-suspended stator pump-jet propeller according to claim 1, characterized in that, the semi-suspended stator blades are evenly arranged on the inner wall of the duct (1).

8. The semi-suspended stator pump-jet propeller according to claim 1, characterized in that, the semi-suspended stator blades (5) include N, and N is a natural number greater than or equal to 2.

9. The semi-suspended stator pump-jet propeller according to claim 1, characterized in that, the duct (1) is a conical structure, the full stator blades (4) are arranged at the large end position of the conical structure, and the blades (3) are arranged at the small end position of the conical structure.

10. The semi-suspended stator pump-jet propeller according to claim 1, characterized in that, the hub (2) is a hollow structure, and a support bearing is arranged inside the hub (2), and the support bearing is used to support the rotating shaft.

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