A connecting structure of a lift fan composite rotor blade

Abstract

The application relates to a connecting structure of a cushioning fan composite rotor blade, and belongs to the technical field of ship design and manufacture. The connecting structure comprises a blade positioning pin, a U-shaped connecting piece, a fastener one, a fastener two and a disc; the outer periphery of the root of the rotor blade is sleeved with the U-shaped connecting piece, the U-shaped connecting piece is connected with the root of the rotor blade through the blade positioning pin; the outer periphery of the U-shaped connecting piece is provided with the disc, the disc is connected with the U-shaped connecting piece through the fastener one, and the disc is connected with the hub through the fastener two. Through the application, the connecting problem of the composite rotor blade and the rotating shaft of a high-power and high-speed cushioning fan can be effectively solved; the structure form of the application can take out the composite rotor blade together with the U-shaped connecting piece by disassembling the bolts between the discs, so that damage to the rotor blade in the disassembling process is avoided, and the application has high maintainability.

Description

Technical Field

[0001] This invention relates to a connection structure for composite material rotor blades of a cushion-lift fan, belonging to the field of ship design and manufacturing technology. Background Technology

[0002] Hovercraft, as a special amphibious transportation tool, utilizes a cushioning fan installed on board to supply compressed air at a certain flow and pressure to the apron, creating an air cushion that allows the hull to lift off the water and travel at high speeds. The cushioning fan, as the key power unit of the hovercraft, is characterized by high rotational speed and large power absorption. To ensure the lightweight design of the hovercraft, lightweight materials such as aluminum alloy and fiberglass are often used. The rotor of the cushioning fan is a crucial component, driving the rotor blades to rotate and generate the pressurized air required by the hovercraft. Compared to metal materials, composite materials have advantages such as light weight, high strength, and corrosion resistance. Therefore, using composite material rotor blades can better meet the lightweight design requirements of the hovercraft while ensuring the overall performance of the cushioning fan.

[0003] Conventional methods for connecting rotor blades to the shaft include integral molding, bolting, and mortise and tenon joints. However, due to the differences in properties between composite materials and metal materials, integral molding or mortise and tenon joints are difficult to use. Considering the high speed of the lift fan and the large centrifugal force on the blades, ordinary bolting connections are not suitable and place high demands on the design of the composite blade root. Furthermore, the lift fan rotor, as a crucial rotating component, requires regular maintenance. The rotor blades should be easy to disassemble to improve overall maintainability. Therefore, this technical field urgently needs to solve the problem of how to connect composite rotor blades to the shaft to achieve a secure connection that is easy to maintain, thereby meeting the requirements of high-power, high-speed lift fans. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problem of how to connect composite material rotor blades and shafts to achieve a firm connection and easy maintenance, thereby meeting the requirements of high-power, high-speed lifting fans.

[0005] To address the aforementioned problems, the present invention provides a connection structure for composite material rotor blades of a jacking fan, used to connect the roots of multiple composite material rotor blades to a rotating shaft. A hub is provided between the rotating shaft and the rotor blades. The connection structure includes blade positioning pins, a U-shaped connector, fastener one, fastener two, and a disc. A U-shaped connector is fitted around the outer periphery of the rotor blade root, and the U-shaped connector is connected to the rotor blade root via the blade positioning pin. A disc is provided around the outer periphery of the U-shaped connector, and the disc is connected to the U-shaped connector via fastener one, and the disc is connected to the hub via fastener two.

[0006] Preferably, the rotor blade root is provided with two mounting through holes for mounting blade positioning pins, and the U-shaped connector is provided with corresponding blade positioning pin mounting holes.

[0007] Preferably, the blade positioning pin is provided with a bushing on its outer periphery.

[0008] Preferably, the outer periphery of the blade positioning pin and the inner side of the bushing are tapered.

[0009] Preferably, the U-shaped connector has a disc on each of its corresponding outer sides, and a through hole for mounting a fastener is provided between the two discs.

[0010] Preferably, the fastener is a double-ended stud I.

[0011] Preferably, a hub is sandwiched between the two discs, and each of the two discs has a through hole for a second mounting fastener for fixing the disc to the hub.

[0012] Preferably, the second fastener is a double-ended stud II.

[0013] Preferably, a plurality of positioning bolts are provided between the disc and the U-shaped connector to prevent the U-shaped connector from circumferentially swinging.

[0014] Preferably, the hub is connected to the shaft via a spline; the side of the U-shaped connector connected to the rotor blade is provided with fastening screws and washers to prevent lateral gaps from occurring during rotor blade installation.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This invention can effectively solve the connection problem between the composite material rotor blades and the shaft of a high-power, high-speed lifting fan.

[0017] The structure of this invention allows the composite material rotor blades, along with the U-shaped connectors, to be removed for maintenance by unscrewing the bolts between the discs, thus avoiding damage to the root of the rotor blades during disassembly and providing high maintainability. Attached Figure Description

[0018] Figure 1 This is a general structural diagram of the connection structure of the composite material rotor blades of a cushion-lifting fan according to the present invention.

[0019] Figure 2 for Figure 1 Sectional view at point AA.

[0020] Reference numerals in the attached drawings: 1. Rotor blade; 2. Blade locating pin; 3. Bushing; 4. U-shaped connector; 5. Disc; 6. Hub; 7. Double-ended stud I; 8. Locating bolt; 9. Double-ended stud II; 10. Fastening screw; 11. Washer. Detailed Implementation

[0021] To make the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings:

[0022] like Figure 1-2 As shown, the technical solution adopted by the present invention is to provide a connection structure for composite material rotor blades of a jacking fan, used to connect the root of multiple composite material rotor blades 1 to a rotating shaft; a hub 6 is provided between the rotating shaft and the rotor blades 1; the connection structure includes blade positioning pins 2, U-shaped connectors 4, fastener one, fastener two, and a disc 5; a U-shaped connector 4 is fitted around the outer periphery of the root of the rotor blade 1, and the U-shaped connector 4 is connected to the root of the rotor blade 1 through the blade positioning pins 2; a disc 5 is provided around the outer periphery of the U-shaped connector 4, and the disc 5 is connected to the U-shaped connector 4 through fastener one, and the disc 5 is connected to the hub 6 through fastener two. The root of the rotor blade 1 has two mounting through holes for installing the blade positioning pins 2, and the U-shaped connector 4 has corresponding mounting holes for the blade positioning pins 2. A bushing 3 is provided around the outer periphery of the blade positioning pin 2. The outer periphery of the blade positioning pin 2 and the inner side of the bushing 3 are tapered. Discs 5 are provided on corresponding sides of the outer periphery of the U-shaped connector 4, and a through hole for installing fastener one is provided between the two discs 5. Fastener one is a double-ended stud I7. A hub 6 is sandwiched between two discs 5, and each of the two discs 5 has a through hole for mounting fastener two to fix the disc 5 to the hub 6. Fastener two is a double-ended stud II9. Multiple positioning bolts 8 are provided between the disc 5 and the U-shaped connector 4 to prevent the U-shaped connector 4 from swinging circumferentially. The hub 6 is connected to the shaft via a spline.

[0023] Example

[0024] This invention provides a connection structure for composite material rotor blades of a jacking fan, used to connect multiple composite material rotor blades to a rotating shaft. The connection structure includes composite material rotor blades 1; blade positioning pins 2 are connected to the outer side of a U-shaped connector 4 via bushings 3. The U-shaped connector 4 is connected to a disc 5 via several fasteners. The disc 5 is connected to a hub 6 via fasteners, and the hub 6 is connected to the rotating shaft via splines. The root of the composite material rotor blade 1 is inserted into the groove of the U-shaped connector 4. The root of the composite material rotor blade 1 has two mounting through holes, which mate with the through holes on both sides of the U-shaped connector 4, and the connection is completed by the blade positioning pins 2 and bushings 3. The outer side of the blade positioning pins 2 and the inner side of the bushings 3 have a certain taper. The U-shaped connector 4 is fixed to the disc 5 by corresponding double-ended studs I7, and is also fixed to the disc 5 by four positioning bolts 8 to prevent circumferential displacement. The disc 5 is fixed to the hub 6 by double-ended studs II9. The inner side of the hub 6 has splines, which mate with the rotating shaft.

[0025] The purpose of this invention is to provide a composite material rotor blade connection structure for a blower, which can connect the composite material rotor blades to the shaft and ensure stable operation of the rotor at high speeds.

[0026] This invention provides a composite material rotor blade connection structure for a jacking fan, used to connect multiple composite material rotor blades to a rotating shaft. The composite material rotor blades 1, blade positioning pins 2, bushings 3, and U-shaped connectors 4 are connected. The U-shaped connectors 4 are connected to upper and lower discs 5 via several fasteners. The upper and lower discs 5 are connected to a hub 6 via fasteners, and the hub 6 is connected to the rotating shaft via splines.

[0027] The root of the composite material rotor blade 1 is inserted into the groove of the U-shaped connector 4. The root of the composite material rotor blade 1 has two mounting through holes, which mate with the through holes on both sides of the U-shaped connector 4, and the connection is completed through the blade positioning pin 2 and the bushing 3. The outer side of the blade positioning pin 2 and the inner side of the bushing 3 have a certain taper to ensure the fit between the parts.

[0028] The U-shaped connector 4 is fixed to the upper and lower discs 5 by corresponding double-ended studs I7, and is further secured to the discs 5 by four positioning bolts 8 to prevent circumferential displacement. The upper and lower discs 5 are fixed to the hub 6 by double-ended studs II9. The hub 6 has a spline on its inner side, which mates with the shaft for connection.

[0029] In addition, three fastening screws 10 and washers 11 are provided on one side of the U-shaped connector 4 to prevent lateral gaps from occurring during the installation of the rotor blades 1. The composite material rotor blades 1 and the U-shaped connector 4 are evenly distributed circumferentially and connected to the upper and lower discs 5 by studs I 7 and positioning bolts 8. The studs I 7 mainly bear the centrifugal load of the blades, and the positioning bolts 8 are used to prevent the circumferential swing of the U-shaped connector 4.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any form or substance. It should be noted that those skilled in the art can make various improvements and additions without departing from the present invention, and these improvements and additions should also be considered within the scope of protection of the present invention. Any modifications, alterations, and equivalent changes made by those skilled in the art based on the above-disclosed technical content without departing from the spirit and scope of the present invention are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, and evolutions made to the above embodiments based on the essential technology of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A connection structure for composite material rotor blades of a jacking fan, used to connect the roots of multiple composite material rotor blades to a rotating shaft; a hub is provided between the rotating shaft and the rotor blades, characterized in that, The connection structure includes a blade positioning pin, a U-shaped connector, fastener one, fastener two, a disc, and positioning bolts. A U-shaped connector is fitted around the outer periphery of the rotor blade root, and the U-shaped connector is connected to the rotor blade root via the blade positioning pin. Discs are located on opposite sides of the outer periphery of the U-shaped connector, and the discs are connected to the U-shaped connector via fastener one. A hub is sandwiched between the two discs, and the discs are connected to the hub via fastener two. Multiple positioning bolts are provided between the discs and the U-shaped connector to prevent circumferential swaying of the U-shaped connector. Fastener one is a double-ended stud I, and fastener two is a double-ended stud II. The composite material rotor blade, along with the U-shaped connector and the discs, can be removed for maintenance by disassembling fastener two, avoiding damage to the rotor blade root during disassembly.

2. The connection structure of the composite material rotor blades of the cushion-lift fan according to claim 1, characterized in that, The rotor blade root is provided with two mounting through holes for installing blade positioning pins, and the U-shaped connector is provided with corresponding blade positioning pin mounting holes.

3. The connection structure of the composite material rotor blades of the cushion-lift fan according to claim 1, characterized in that, The blade positioning pin is provided with a bushing on its outer periphery.

4. The connection structure of the composite material rotor blades of the cushion-lift fan according to claim 3, characterized in that, The outer periphery of the blade positioning pin and the inner side of the bushing are tapered.

5. The connection structure of the composite material rotor blades of the cushion-lift fan according to claim 1, characterized in that, A through hole is provided between the two discs for installing fastener one.

6. The connection structure of the composite material rotor blades of the cushion-lift fan according to claim 5, characterized in that, Each of the two discs has a through hole for mounting fastener two used to fix the disc to the hub.

7. The connection structure of the composite material rotor blades of the cushion-lift fan according to claim 1, characterized in that, The hub is connected to the shaft via a spline; the side of the U-shaped connector that connects to the rotor blades is provided with fastening screws and washers to prevent lateral gaps from occurring during rotor blade installation.

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