Novel thin-wall stator hub and carbon fiber blade connecting structure

Abstract

The utility model provides a novel thin-wall stator hub and carbon fiber blade connecting structure, which comprises a stator hub, a carbon fiber blade, a stator hub skin and an outer guide pipe, the carbon fiber blade is used for connecting the stator hub and the outer guide pipe, the stator hub skin is laid on a stator hub surface layer to be connected into a whole, and the stator hub skin and the outer guide pipe are of a circumferential annular structure; when the stator hub skin is laid at the joint of the stator hub, an upward protrusion is formed, a skin protruding area formed by the stator hub skin is formed, and no stator protruding area exists in the skin protruding area. The beneficial effects of the utility model are that no stator protruding area exists in the skin protruding area, so that the depth amplitude of the connection of the carbon fiber blades and the stator hub is not weakened due to the reduction of the thickness of the stator hub.

Description

Technical Field

[0001] This utility model relates to the design structure of an underwater propulsion device, specifically an assembly structure of a pump-jet propulsion stator hub and blades. Background Technology

[0002] Pump-jet propulsion systems are primarily used for propulsion in equipment such as QT (Quick-Track) systems and unmanned aerial vehicles (UAVs). They mainly consist of a stator duct and a rotor propulsion unit. The stator duct can be divided into a front stator and a rear stator duct, offering advantages such as high propulsion efficiency and low noise. In a front stator duct, the stator is located upstream of the blades. By homogenizing the wake flow and generating swirling flow, the rotor's inflow is improved. Combined with a deceleration duct, this suppresses cavitation and reduces propulsion excitation force and radiation.

[0003] The composite material duct consists of a stator hub, carbon fiber blades, a stator hub skin, and an outer duct. The stator hub is machined from aluminum alloy or titanium alloy, the carbon fiber blades are molded from carbon fiber prepreg, the stator hub is hand-laid-in of fiberglass, and the outer duct is hand-laid-in on a mold.

[0004] The stator hub and carbon fiber blades are connected by embedding the carbon fiber blades into the stator hub and then bonding them together with adhesive. For ducts where weight requirements are not high, and the stator hub wall thickness is sufficient, this method of connection is feasible.

[0005] However, for heavy-duty conduits or thin-walled stator hub structures (stator hub wall thickness 3-8mm), this embedded solution poses risks and cannot meet strength requirements.

[0006] Chinese Patent Publication No. CN 219067941 U, entitled "An Insertion Assembly Structure for the Rear Stator of a Pump-Jet Propeller," discloses an insertion assembly structure for the rear stator of a pump-jet propeller. The rear stator has an upper connecting piece at its upper end, which inserts into a guide tube groove, and a lower connecting piece at its lower end, which inserts into grooves at the front and rear ends of the hub. The front end of the hub is a hollow structure filled with a low-density non-metallic sleeve to reduce component weight. However, for structures requiring a thin-walled stator hub (3-8mm wall thickness), this groove-embedded design carries risks and cannot meet the strength requirements for the connection between the stator and blades. Summary of the Invention

[0007] This invention provides a lightweight, high-strength composite material thin-walled stator hub and carbon fiber blade connection structure.

[0008] The technical solution of this utility model is:

[0009] A novel connection structure between a thin-walled stator hub and carbon fiber blades includes a stator hub, carbon fiber blades, a stator hub skin, and an outer guide tube. The carbon fiber blades are used to connect the stator hub and the outer guide tube. The stator hub skin is laid on the surface layer of the stator hub and connected as a whole, all of which are in a circumferential ring structure. When the stator hub skin is laid at the connection point of the stator hub, it forms an upward protrusion, forming a skin protrusion area composed of the stator hub skin. There is no stator protrusion area within the skin protrusion area.

[0010] Beneficial effect: Since there is no stator protrusion area within the skin protrusion area, the depth of the carbon fiber blade connection to the stator hub is not weakened by the reduction in the thickness of the stator hub. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of a composite material pre-conduit structure;

[0012] Figure 2 Schematic diagram of the connection structure between the stator hub and carbon fiber blades (existing technology);

[0013] Figure 3 This is a schematic diagram of the connection structure between the stator hub and the carbon fiber blades of this utility model.

[0014] Figure 4 This is a schematic diagram of the skin protrusion area of ​​the stator hub and carbon fiber blade connection structure of this utility model.

[0015] Figure 5 This is a schematic diagram of the stator protrusion area of ​​the stator hub and carbon fiber blade connection structure of this utility model;

[0016] Among them, 1-stator hub; 101-stator protrusion area; 2-carbon fiber blade; 3-stator hub skin; 301-skin protrusion area; 4-outer guide tube. Detailed Implementation Plan

[0017] The present invention will be further described below with reference to the accompanying drawings:

[0018] See appendix Figure 1The existing composite material duct consists of a stator hub 1, carbon fiber blades 2, a stator hub skin 3, and an outer duct 4. The stator hub 1 is machined from aluminum alloy or titanium alloy. The carbon fiber blades 2 are supported between the stator hub 1 and the outer duct 4. The carbon fiber blades 2 are molded from carbon fiber prepreg. The stator hub skin 3 is made by hand lay-up molding of fiberglass. The outer duct 4 is made by hand lay-up molding on a mold. Modern requirements for ducts used in QT, unmanned aerial vehicles, and other equipment require the weight to be as low as possible without affecting their performance. The weight of the duct is mainly determined by the stator hub 1. Therefore, reducing the mass of the stator hub 1 will inevitably reduce its thickness, and will also affect the insertion depth of the carbon fiber blades 2 into the stator hub 1, thus affecting the connection strength between them.

[0019] See appendix Figure 2 The stator hub 1 and the carbon fiber blades 2 are connected by embedding the carbon fiber blades into the stator hub 1 and then bonding them together with adhesive. The stator hub skin 3, laid on the resin of the stator hub 1, connects the carbon fiber blades 2 and the surface layer of the stator hub 1 into a whole, both forming a circumferential ring structure. Simultaneously, the stator hub skin 3 is laid at the connection point of the stator hub 1, forming an upward protrusion, creating a skin protrusion area 301 composed of the carbon fiber blades 2 (see...). Figure 4 ).

[0020] For conduits with low weight requirements, where the stator hub wall thickness is sufficient, this method of connection is feasible. However, for conduits with high weight requirements or structures with thin-walled stator hubs (3-8mm thick), this embedded solution carries inherent risks and cannot meet strength requirements.

[0021] See Figure 5 In this invention, a stator protrusion area 101 is also provided at the connection point of the carbon fiber blades 2 of the stator hub 1 (see [reference]). Figure 5 This ensures that even when the weight of the stator hub 1 is reduced (i.e., the thickness of the stator hub is reduced by the thinner wall), the depth of the inserted carbon fiber blades 2 does not decrease, and the connection strength between them is not affected.

[0022] Includes the following steps:

[0023] Step S1: Manufacture the composite material outer guide tube 4, stator hub 1 and carbon fiber blade 2, wherein the stator hub has a stator protrusion area 101 at the connection between it and the carbon fiber blade 2.

[0024] Step S2: Weld the carbon fiber blade 2 to the composite material duct accordingly.

[0025] Step S3: Lay multiple layers of fiber cloth 1 on the outside of the stator hub 1 of the metal frame. When laying the fiber cloth, the end of the fiber cloth extends to the stator protrusion area 101 to form the skin protrusion area 301. The skin protrusion area 301 and the stator protrusion area 101 are mostly overlapped. Apply adhesive to the bottom of the fiber cloth to make it stick to the skin protrusion area 301 and the stator protrusion area 101.

[0026] Step S5: Inject resin into the multi-layer fiber cloth. After the resin cures, the composite material pre-conduit is formed.

[0027] The manufacturing method of the composite material duct and stator hub connection structure of the jet propulsion system proposed in this invention can significantly reduce the weight of the metal alloy of the stator hub 1 of the composite material front duct while ensuring the connection strength between the two.

Claims

1. A novel connection structure between a thin-walled stator hub and carbon fiber blades, comprising a stator hub, carbon fiber blades, a stator hub skin, and an outer guide tube, wherein the carbon fiber blades are used to connect the stator hub and the outer guide tube, and the stator hub skin is laid on the surface layer of the stator hub and connected as a whole, all having a circumferential annular structure; when the stator hub skin is laid at the connection point of the stator hub, it forms an upward protrusion, forming a skin protrusion area composed of the stator hub skin, characterized in that, There is no stator protrusion area within the skin protrusion area.

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