Low-noise engine ducted fan

Abstract

The utility model relates to the technical field of engine ducted fans, in particular to a low-noise engine ducted fan. The low-noise engine ducted fan comprises a ducted fan shell, the interior of the shell wall of the ducted fan shell is of a hollow design and is of a multi-compartment design, a set of reinforcing plates are arranged between every two sets of compartments, and the reinforcing plates are evenly arranged in the hollow part of the interior of the shell wall of the ducted fan shell in an annular array mode; the honeycomb plate, the porous noise reduction plate, the first foamed aluminum plate and the second foamed aluminum plate have good noise reduction and sound absorption effects, noise generated during work of the engine ducted fan can be effectively absorbed through mutual cooperation, and the noise reduction assembly installed in the compartment in the ducted fan shell can be stabilized and prevented from vibration through the rubber pad; noise generated by the ducted fan of the engine during working can make contact with all noise reduction components in the noise reduction assembly more easily through the sound transmission holes in the rubber pad.

Description

Technical Field

[0001] The utility model relates to the technical field of engine ducted fans, and specifically relates to a low-noise engine ducted fan. Background Technique

[0002] An engine ducted fan refers to a propulsion device in which a duct is arranged on the periphery of a free propeller. The ducted fan can generate greater lift than an isolated fan with the same diameter.

[0003] Nowadays, in order to reduce the noise of the engine ducted fan, the outer shell of the engine ducted fan is usually designed to be hollow, and the inside is filled with porous sound-absorbing plates to achieve the purpose of reducing noise. However, it is difficult to effectively reduce the noise of the engine ducted fan only by filling the porous sound-absorbing plates. In view of the above situation, technical innovation is carried out on the basis of the existing low-noise engine ducted fan. Content of the Utility Model

[0004] The purpose of the utility model is to provide a low-noise engine ducted fan to solve the problems put forward in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A low-noise engine ducted fan, comprising:

[0006] A ducted fan housing, the inner wall of the ducted fan housing is designed to be hollow and has a multi-compartment design. A group of reinforcing plates are arranged between every two groups of compartments. The reinforcing plates are evenly arranged in a circular array in the hollow part inside the wall of the ducted fan housing. Noise reduction components are placed in the compartments inside the wall of the ducted fan housing.

[0007] Preferably, the noise reduction component includes a second aluminum foam board, the outside of the second aluminum foam board is wrapped with a porous sound-absorbing board, the outside of the porous sound-absorbing board is wrapped with a honeycomb board, the outside of the honeycomb board is wrapped with a first aluminum foam board, and the outside of the first aluminum foam board is wrapped with a rubber pad.

[0008] Preferably, an adhesive is applied between the second aluminum foam board and the porous sound-absorbing board and between the porous sound-absorbing board and the honeycomb board.

[0009] Preferably, an adhesive is applied between the honeycomb board and the first aluminum foam board and between the first aluminum foam board and the rubber pad.

[0010] Preferably, sound transmission holes are evenly penetrated through the outer side wall of the rubber pad, and the outer side wall of the rubber pad is closely attached to the inner side wall of the compartment of the ducted fan housing.

[0011] Preferably, the right air outlet of the ducted fan housing is designed to be serrated.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] In the present utility model, the strength of the ducted fan housing is improved through the reinforcing plate, thereby ensuring the reliability of the engine ducted fan. The second foam aluminum plate and the first foam aluminum plate have good impact resistance, which can provide strength support for the inside and outside of the noise reduction component, thereby increasing the service life of the noise reduction component;

[0014] The honeycomb plate, the porous sound-absorbing plate, the first foam aluminum plate and the second foam aluminum plate have good noise reduction and sound absorption effects. Through their mutual cooperation, they can effectively absorb the noise generated by the operation of the engine ducted fan. The rubber pad can stabilize and shock-proof the noise reduction component installed in the inner compartment of the ducted fan housing. The sound transmission holes on the rubber pad can enable the noise generated by the operation of the engine ducted fan to more easily contact each noise reduction component inside the noise reduction component, thereby ensuring the noise reduction effect of the device;

[0015] The right air outlet of the ducted fan housing is designed in a zigzag shape. The zigzag tail nozzle can increase the contact area between the exhaust flow and the outside atmosphere to reduce the jet speed, thereby reducing the noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of a low-noise engine ducted fan of the present utility model;

[0017] Figure 2 is a front cross-sectional view of a low-noise engine ducted fan of the present utility model;

[0018] Figure 3 is a left cross-sectional view of a low-noise engine ducted fan of the present utility model.

[0019] In the figure: 1. Ducted fan housing; 11. Reinforcing plate; 12. Rubber pad; 13. Honeycomb plate; 14. Porous sound-absorbing plate; 15. First foam aluminum plate; 16. Second foam aluminum plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0021] Please refer to Figures 1 - 3, a low-noise engine ducted fan, comprising a ducted fan housing 1. The inner wall of the ducted fan housing 1 is designed to be hollow and multi-compartment. A set of reinforcing plates 11 are fixedly arranged between every two groups of compartments. The strength of the ducted fan housing 1 is improved through the reinforcing plates 11, thereby ensuring the reliability of the engine ducted fan in use. The reinforcing plates 11 are fixedly arranged in a circular array evenly in the hollow part inside the wall of the ducted fan housing 1. A noise reduction component is placed in the compartment inside the wall of the ducted fan housing 1. The noise reduction component includes a second aluminum foam board 16. The outside of the second aluminum foam board 16 is wrapped with a porous sound-absorbing board 14. The outside of the porous sound-absorbing board 14 is wrapped with a honeycomb board 13. The outside of the honeycomb board 13 is wrapped with a first aluminum foam board 15. The outside of the first aluminum foam board 15 is wrapped with a rubber pad 12. An adhesive is applied between the second aluminum foam board 16 and the porous sound-absorbing board 14 and between the porous sound-absorbing board 14 and the honeycomb board 13. An adhesive is also applied between the honeycomb board 13 and the first aluminum foam board 15 and between the first aluminum foam board 15 and the rubber pad 12. The second aluminum foam board 16 and the first aluminum foam board 15 have good impact resistance, which can provide strength support for the inside and outside of the noise reduction component, thereby increasing the service life of the noise reduction component. The honeycomb board 13, the porous sound-absorbing board 14, the first aluminum foam board 15 and the second aluminum foam board 16 have good noise reduction and sound absorption effects. By cooperating with each other, they can effectively absorb the noise generated during the operation of the engine ducted fan. Sound transmission holes are evenly penetrated through the outer side wall of the rubber pad 12. The outer side wall of the rubber pad 12 is closely attached to the inner side wall of the compartment of the ducted fan housing 1. The rubber pad 12 can play a role in stabilizing and shock-proofing the noise reduction component installed in the compartment of the ducted fan housing 1. The noise generated during the operation of the engine ducted fan can more easily contact each noise reduction component inside through the sound transmission holes on the rubber pad 12, thereby ensuring the noise reduction effect of the device. The right air outlet of the ducted fan housing 1 is designed to be serrated. The serrated tail pipe can increase the contact area between the exhaust flow and the outside atmosphere to reduce the jet speed, thereby reducing the noise.

[0022] Working principle: The strength of the ducted fan housing 1 is improved by the reinforcing plate 11 to ensure the reliability of the engine ducted fan. The second foam aluminum plate 16 and the first foam aluminum plate 15 have good impact resistance, which can provide strength support for the inside and outside of the noise reduction component, thereby increasing the service life of the noise reduction component. The honeycomb plate 13, the porous sound absorption plate 14, the first foam aluminum plate 15 and the second foam aluminum plate 16 have good noise reduction and sound absorption effects. By cooperating with each other, they can effectively absorb the noise generated by the operation of the engine ducted fan. The rubber pad 12 can stabilize and shock-proof the noise reduction component installed in the inner compartment of the ducted fan housing 1. The sound transmission holes on the rubber pad 12 enable the noise generated by the operation of the engine ducted fan to more easily contact with each noise reduction component inside the noise reduction component, thereby ensuring the noise reduction effect of the device. The right air outlet of the ducted fan housing 1 is designed with a serrated shape. The serrated tail nozzle can increase the contact area between the exhaust flow and the outside atmosphere to reduce the jet speed, thereby reducing the noise.

Claims

1. A low-noise engine ducted fan, characterized in that, Including: A ducted fan housing (1), the interior of the housing wall of the ducted fan housing (1) is hollow-designed and multi-compartment-designed, and a set of reinforcing plates (11) are arranged between every two groups of the compartments. The reinforcing plates (11) are uniformly arranged in a circular array in the hollow part inside the housing wall of the ducted fan housing (1), and noise reduction components are placed in the compartments inside the housing wall of the ducted fan housing (1).

2. The low-noise engine ducted fan according to claim 1, wherein: The noise reduction components include a second aluminum foam board (16), the outside of the second aluminum foam board (16) is wrapped with a porous sound-absorbing board (14), the outside of the porous sound-absorbing board (14) is wrapped with a honeycomb board (13), the outside of the honeycomb board (13) is wrapped with a first aluminum foam board (15), and the outside of the first aluminum foam board (15) is wrapped with a rubber pad (12).

3. The low-noise engine bypass fan according to claim 2, wherein: An adhesive is applied between the second aluminum foam board (16) and the porous sound-absorbing board (14) and between the porous sound-absorbing board (14) and the honeycomb board (13).

4. A low-noise engine ducted fan according to claim 2, characterized in that: An adhesive is applied between the honeycomb board (13) and the first aluminum foam board (15) and between the first aluminum foam board (15) and the rubber pad (12).

5. A low-noise engine ducted fan according to claim 2, characterized in that: Sound transmission holes are uniformly penetrated through the outer side wall of the rubber pad (12), and the outer side wall of the rubber pad (12) is closely attached to the inner side wall of the compartment of the ducted fan housing (1).

6. The low-noise engine ducted fan according to claim 1, characterized in that: The right air outlet of the ducted fan housing (1) is serrated.

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