Integrated motor propeller vibration and noise reduction device

Abstract

The application relates to an integrated motor propeller vibration reduction and noise reduction device, which comprises a noise reduction module, a vibration reduction module and a mounting cylinder, a plurality of noise reduction modules and vibration reduction modules are respectively arranged on the two sides of the propeller, the rubber spring in the vibration reduction module is compressed to provide a rated pressure for the propeller, so as to reduce the vibration influence of the propeller; the noise reduction module is used for absorbing the hydrodynamic noise generated in the operation process of the propeller, isolating the transmission of the hydrodynamic noise to the outside and reducing the radiation noise level of the propeller. The integrated motor propeller vibration reduction and noise reduction device meets the demand of the integrated motor propeller vibration reduction and noise reduction, and effectively reduces the transmission of the vibration noise to the outside through the arranged vibration reduction module and noise reduction module.

Description

TECHNICAL FIELD

[0001] The application relates to a ship vibration and noise reduction device, in particular to a vibration and noise reduction device of an integrated motor propeller. BACKGROUND

[0002] The integrated motor propeller is a new type of propelling mode, which can be used as a main propelling device of underwater and surface vehicles, and can also be used as a side propelling and emergency propelling device. The integrated motor propeller is characterized in that the power device does not need to be connected by a shaft system, the motor and the propeller are integrated and placed outside the cabin, and the coupling vibration of the propeller shaft system is eliminated. When the propeller works, the high-speed rotation of the propeller in water will cause vibration of the ship structure, which seriously affects the operation of the equipment on the ship and the normal work of the staff on the ship. In order to solve the problems of vibration and noise, the existing technology reduces the vibration and noise by strengthening the structure of the cabin periphery and adding vibration and noise reduction materials on the deck and cabin wall in the cabin. How to install a vibration and noise reduction device at the vibration source position and control the vibration and noise of the propeller from the vibration source is an effective way to control the vibration and noise of the propeller. However, the integrated motor propeller eliminates the coupling vibration of the propeller shaft system, which brings difficulties to the vibration and noise reduction work. Affected by the installation space and the underwater working environment, the integrated motor propeller cannot adopt the traditional vibration isolation measures to isolate the vibration and noise, therefore, it is necessary to design a vibration and noise reduction structure for the integrated motor which can adapt to the underwater working environment. SUMMARY

[0003] The application aims at solving the above technical problems, and provides an integrated motor vibration and noise reduction device which can adapt to the underwater environment, reduces the vibration and noise of the integrated motor propeller from the source, and reduces the radiation level of the propeller vibration and noise.

[0004] To achieve the above object, the technical scheme of the application is as follows: an integrated motor propeller vibration and noise reduction device, comprising a noise reduction module, a vibration reduction module and a mounting cylinder, a plurality of noise reduction modules and vibration reduction modules are respectively arranged on both sides of the propeller, the rubber spring in the vibration reduction module is compressed to provide a rated pressure to the propeller, so as to reduce the vibration influence of the propeller; the noise reduction module is used for absorbing the water power noise generated during the operation of the propeller, isolating the transmission of the water power noise to the outside, and reducing the radiation noise level of the propeller.

[0005] Further, each noise reduction module is fixedly connected in the mounting cylinder by bolts, the noise reduction plate and the fixed plate of the noise reduction module cover the propeller fixing seat of the vibration reduction module, form a circular structure, become a noise reduction area, and the inner diameter is equal to the inlet and outlet diameter of the propeller.

[0006] Further, the noise reduction module comprises a fixing seat, a sound absorption pad, a panel and a sound absorption plate, the fixing seat is fixed on the mounting cylinder by bolts, the panel is fixed on the fixing seat and the thruster fixing frame, the surface of the panel is provided with a groove, the sound absorption pad is pasted on the groove, and the outer surface is fixed with the sound absorption plate.

[0007] Further, the fixing seat is made of aluminum alloy after welding and processing, the surface is treated by oxidation, the bottom surface is arc-shaped, the included angle between the two sides is 30°, a plurality of fixing seats are spliced to form a cylindrical shape, and the cylindrical shape is fixed in the mounting cylinder by bolts, and the surface is provided with a sound reduction structure.

[0008] Further, the sound absorption pad is made of rubber material and is pasted in the panel groove by using waterproof AB glue, so that the sound absorption effect is improved.

[0009] Further, the panel is made of aluminum alloy, a long groove is formed on the upper surface of the panel, so that a cavity structure is formed after the panel is installed with the sound absorption plate, the bottom surface is arc-shaped, the included angle between the two long sides is 30°, and the panel is fixed on the fixing seat by bolts.

[0010] Further, the sound absorption plate is made of sandwich aluminum plate and is provided with a plurality of rows of 5mm micropores according to certain rules, the bottom surface is arc-shaped, the included angle between the two long sides is 30°, and the sound absorption plate is fixed on the panel by bolts.

[0011] Further, the damping module comprises a fixing frame, a damper and fixing bolts, during installation, two mounting bolts are used to pass through the bolt holes of the fixing frame and the damper and are fixed on the thruster, the tightening torque is increased, the damper is compressed to a specified installation size, then three fixing bolts are used to fix the fixing frame and the damper in the mounting cylinder, and the mounting bolts are loosened and removed, so that the thruster axial vibration does not drive the mounting cylinder to vibrate together.

[0012] Further, during the test, shims are added between the fixing frame and the damper of the damping module to adjust the pre-tightening force of the damper and the axial damping effect of the thruster.

[0013] The device meets the needs of integrated motor thruster damping and noise reduction, effectively reduces the transmission of vibration noise to the outside through the damping module and the noise reduction module, and has the following beneficial effects:

[0014] (1) The noise reduction module can absorb the water power noise generated during the operation of the thruster, isolate the transmission of the water power noise to the outside, and reduce the radiation noise level of the thruster.

[0015] (2) The damping module can absorb the vibration generated during the operation of the thruster, reduce the transmission of the vibration to the ship body, and provide a low-vibration and low-noise environment for other equipment on the ship and the crew. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1The integrated motor propeller damping and noise reduction device is shown in the schematic view.

[0017] Figure 2 The left view of the integrated motor propeller damping and noise reduction device is shown in the schematic view. Figure 1 The left view of the integrated motor propeller damping and noise reduction device is shown in the schematic view.

[0018] Figure 3 The schematic view of the damping and noise reduction module is shown in the schematic view.

[0019] Figure 4 The front view of the noise reduction module is shown in the schematic view.

[0020] Figure 5 The left view of the noise reduction module is shown in the schematic view.

[0021] Figure 6 The cross-sectional view of the noise reduction module is shown in the schematic view.

[0022] Figure 7 The schematic view of the damping module is shown in the schematic view. DETAILED DESCRIPTION

[0023] The present application is further described below in conjunction with the accompanying drawings and examples.

[0024] As shown in FIG. 1, the integrated motor propeller damping and noise reduction device comprises a noise reduction module 1, a damping module 2, and a mounting cylinder 3. Twelve noise reduction modules 1 and twelve damping modules 2 are arranged on one side of the propeller. The twelve damping modules 1 are fixed on both sides of the propeller, and the rubber springs in the damping modules provide a rated pressure to the propeller to reduce the vibration of the propeller. Figure 1 As shown in FIG. 2, each noise reduction module 1 is fixed in the mounting cylinder 3 by bolts, and the noise reduction plate and the fixed plate of the noise reduction module 1 cover the propeller fixing seat of the damping module 2 to form a circular structure, which is a noise reduction area, and the inner diameter is equal to the inlet and outlet diameter of the propeller.

[0025] Figure 3 As shown in FIG. 3, the noise reduction module 1 comprises a fixing seat 1-1, a sound absorption pad 1-2, a panel 1-3, and a sound absorption plate 1-4. The fixing seat 1-1 is fixed on the mounting cylinder 3 by bolts, the panel 1-3 is fixed on the fixing seat 1-1 and the propeller fixing frame, the surface of the panel 1-3 is provided with a groove, the sound absorption pad 1-2 is pasted on the groove, and the sound absorption plate 1-4 is fixed on the outer surface. The structure combined by various noise reduction methods can weaken the sound propagation energy layer by layer, and finally achieve the noise reduction effect.

[0026] Figure 4

[0027] ​​​Preferably, the fixed seat 1-1 uses aluminum alloy welding post-processing, surface oxidation treatment, the bottom is circular arc, the angle between the two sides is 30°, and 12 spliced ones are combined into a cylindrical shape and fixed in the installation cylinder 3 by bolts 1-7, and then the sound attenuation structure is installed on the surface. The use of spliced independent structure can reduce the weight of each fixed seat, facilitate installation, and the square holes are opened on the front and rear panels and the middle rib plate of the fixed seat, which facilitates water flow and reduces resistance.

[0028] Preferably, the sound absorption pad 1-2 is made of rubber material and is pasted in the panel groove by using waterproof AB glue to increase the sound absorption effect.

[0029] Preferably, the panel 1-3 is made of aluminum alloy and has a long groove on the upper surface to form a cavity structure after installation with the sound absorption plate. The bottom is circular arc, the angle between the two long sides is 30°, and the same specification as the fixed seat is used to fix on the fixed seat 1-1 by bolts 1-6.

[0030] Preferably, the sound absorption plate 1-4 is made of sandwich aluminum plate and has multiple columns of 5mm micropores according to the rules. The bottom is circular arc, the angle between the two long sides is 30°, and the same specification as the fixed seat is used to fix on the panel 1-3 by bolts 1-5.

[0031] As shown in Figure 7 The damping module includes a fixed frame 2-1, a damper 2-2, and a fixing bolt 2-3. When installing the damping module, first use two installation bolts to pass through the bolt holes of the fixed frame 2-1 and the damper 2-2 to fix on the propeller, increase the tightening torque to compress the damper to the specified installation size, and then use three fixing bolts 2-3 to fix the fixed frame 2-1 and the damper 2-2 in the installation cylinder, loosen the installation bolts and take away, so that the propeller axial vibration will not drive the installation cylinder to vibrate together through the installation bolts.

[0032] During the test, the pre-tightening force of the damper 2-2 is adjusted by adding a gasket between the fixed frame 2-1 and the damper 2-2 to adjust the axial damping effect of the propeller.

[0033] After testing on the test bench, the vibration acceleration of the integrated motor propeller at the external installation bolt is reduced by 3.5dB, and the radiation noise is reduced by 3dB after installing the damping and noise reduction module.

Claims

1. An integrated motor propeller vibration and noise reduction device, characterized by: The application relates to a propeller damping device, which comprises a damping module, a damping module, a mounting cylinder, a plurality of damping modules and damping modules are respectively arranged on the two sides of the propeller, the rubber spring in the damping module is compressed to provide a rated pressure for the propeller and reduce the vibration influence of the propeller. The damping module is used for absorbing the water power noise generated during the operation of the propeller, isolating the transmission of the water power noise to the outside and reducing the radiation noise level of the propeller; each damping module is fixedly connected in the mounting cylinder through bolts to form a cylindrical structure and become a damping area, and the inner diameter of the damping area is equal to the inlet and outlet diameter of the propeller; the damping module comprises a fixing seat, a sound absorption pad, a panel and a sound absorption plate, the fixing seat is fixed on the mounting cylinder through bolts, grooves are dug on the surface of the panel, sound absorption pads are pasted on the grooves, and the sound absorption plate is fixed on the outer surface of the panel; the damping module comprises a fixing frame, a damper and fixing bolts; during installation, two installation bolts are used to pass through the bolt holes of the fixing frame and the damper and are fixed on the propeller, the tightening torque is increased to compress the damper to a specified installation size, then three fixing bolts are used to fix the fixing frame and the damper in the mounting cylinder, and the installation bolts are loosened and removed, so that the mounting cylinder cannot vibrate together with the propeller when the propeller axially vibrates.

2. The integrated motor propulsor vibration and noise reduction apparatus of claim 1, wherein: The fixing seat is made of aluminum alloy after welding and processing, the surface is subjected to oxidation treatment, the bottom surface is arc-shaped, the included angle between the two sides is 30 DEG, a plurality of fixing seats are spliced to form a cylindrical shape, and the fixing seats are fixed in the mounting cylinder through bolts, and the surface mounting sound insulation structure is used.

3. The integrated motor propulsor vibration and noise reduction apparatus of claim 1, wherein: The sound absorption pad is made of rubber and is pasted in the panel groove through waterproof AB glue, and is used for increasing the sound absorption effect.

4. The integrated motor propulsor vibration and noise reduction apparatus of claim 1, wherein: The panel is made of aluminum alloy, a long groove is formed on the upper surface of the panel, the panel forms a cavity structure after being installed with the sound absorption plate, the bottom surface is arc-shaped, the included angle between the two long sides is 30 DEG, and the panel is fixed on the fixing seat through bolts.

5. The integrated motor propulsor vibration and noise reduction apparatus of claim 1, wherein: The sound absorption plate is made of sandwich aluminum plate and is provided with a plurality of rows of 5mm micropores according to certain rules, the bottom surface is arc-shaped, the included angle between the two long sides is 30 DEG, and the sound absorption plate is fixed on the panel through bolts.

6. The integrated motor propulsor vibration and noise reduction apparatus of claim 1, wherein: During the test, the gasket is arranged between the fixing frame and the damper of the damping module to adjust the pre-tightening force of the damper and adjust the axial damping effect of the propeller.

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