CN217682031U - Air filter for reducing BPF noise of supercharger - Google Patents

Abstract

The utility model discloses an air filter for reducing BPF noise of a supercharger, which comprises an end cover, a bottom cover and a framework, wherein a silencing ring is arranged inside the end cover; the framework comprises an inner framework and an outer framework, and sound-absorbing cotton and a filter layer are sequentially arranged between the inner framework and the outer framework from inside to outside; the framework is arranged between the bottom cover and the end cover to form a cavity; the air filter of the utility model can play a role in obviously reducing the BPF noise of the supercharger, and the noise reduction does not need to change the structure of the supercharger, thus not affecting the performance of the supercharger; proved by verification, the structure of the air filter can comprehensively reduce the BPF noise of the supercharger by more than 2 dBA-4 dBA.

Description

Air filter for reducing BPF noise of supercharger

Technical Field

The utility model belongs to the technical field of automobile engine air intake system, specifically, relate to an air cleaner who reduces booster BPF noise.

Background

The statements herein merely provide background related to the present disclosure and may not necessarily constitute prior art.

The large-cylinder-diameter diesel engine is widely applied to the fields of ship engines, power generation, engineering machinery and the like, and the noise problem is more serious because the operating power of the large-cylinder-diameter diesel engine is far higher than that of a small-cylinder-diameter diesel engine. At present, in order to improve the dynamic property, the economical efficiency and the low emission of the diesel engine, a supercharging technology is generally adopted, and a turbocharger is a key part of the supercharging technology and consists of a turbine, an intermediate body and a press machine. Among them, BPF (blade passing frequency) noise generated by the compressor has a high frequency, is subjectively sensitive to sharp and squeal, and is not comfortable, and is also a key point of noise control. The radiation paths are 3 types: 1. a supercharger inlet; 2. a flow widening slot; 3. compressor casings, of which the first two approaches are dominant.

In the prior art, the noise of the supercharger BPF is reduced by optimizing the shape of a supercharger blade, the clearance between a blade and a shell or wrapping the shell, and the performance of a diesel engine is influenced because the shape of a supercharger compressor blade is changed or the optimized clearance is usually changed along with the performance change of the supercharger. In addition, the BPF noise can be reduced by wrapping the supercharger shell, but the effect is general.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a reduce air cleaner of booster BPF noise, under the condition that does not change the booster structure, through the improvement to current air cleaner structure, reduce booster BPF noise, improve the sound quality.

In order to achieve the above purpose, the present invention is realized by the following technical solution:

in a first aspect, an embodiment of the present invention provides an air cleaner for reducing BPF noise of a supercharger, which is characterized by including an end cover, a bottom cover and a framework, wherein a silencing ring is arranged inside the end cover; the framework comprises an inner framework and an outer framework, and sound-absorbing cotton and a filter layer are sequentially arranged between the inner framework and the outer framework from inside to outside; the framework is arranged between the bottom cover and the end cover to form a cavity.

As a further technical scheme, the end cover is provided with a clamping belt, and the clamping belt is sleeved on the outer wall of the end cover.

As a further technical scheme, a damping pad is arranged at the end part of the end cover.

As a further technical scheme, an air outlet is formed in the end cover.

As a further technical scheme, the silencing ring is made of metal.

As a further technical scheme, the silencing ring is fixed on the inner side of the end cover in a welding mode.

As a further technical scheme, the silencing ring is of an annular structure, and the inner sectional area of the silencing ring is reduced from large to small.

As a further technical scheme, the damping pad is made of rubber.

As a further technical scheme, the inner framework and the outer framework are made of iron wire nets.

As a further technical scheme, the filter layer adopts superfine fiber filter paper.

Above-mentioned the utility model discloses an embodiment's beneficial effect as follows:

the air filter provided by the utility model can play a role in obviously reducing the BPF noise of the supercharger, and particularly can insulate the sound of the noise radiated from the flow widening grooves; the noise reduction does not need to change the structure of the supercharger, and the performance of the supercharger is not influenced; the noise reduction effect is achieved by arranging the sound absorption cotton and the noise reduction ring; the silencing ring that sets up can not only play the effect that reduces the noise, but also can play the water conservancy diversion effect to the gas in the air cleaner.

The utility model discloses an air cleaner of reduction booster BPF noise, simple structure, the noise reduction effect is good, and is empirical, and this air cleaner's structure can be synthesized and reduce booster BPF noise more than 2dBA ~ 4 dBA.

Drawings

The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.

FIG. 1 is a schematic structural view of an air cleaner according to the present invention;

fig. 2 is a booster BPF noise propagation path.

The schematic diagram is used only schematically.

In the figure: 1. a bottom cover; 2. an outer skeleton; 3. a filtering layer; 4. sound-absorbing cotton; 5. an inner skeleton; 6. an end cap; 7. a sound deadening ring; 8. clamping a belt; 9. a vibration damping pad; 10. a supercharger; 11. an air intake duct; 12. a flow widening slot; 13. an air cleaner.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

In a typical embodiment of the present invention, as shown in fig. 1, an air cleaner capable of reducing BPF noise of a supercharger is provided, including: a bottom cover 1; an outer skeleton 2; a filter layer 3; sound absorption cotton 4; an inner skeleton 5; an end cap 6; a sound-deadening ring 7; a clamping band 8; and a vibration damping pad 9.

The end cover 6, the bottom cover 1 and the framework form an integral structure of the air filter, the air filter is integrally cylindrical, and the framework is arranged between the end cover 6 and the bottom cover 1 to form a cavity for air to flow; the framework comprises an inner framework 5 and an inner framework 2, and sound-absorbing cotton 4 and a filter layer 3 are sequentially arranged between the inner framework 5 and the outer framework 2 from inside to outside; a silencing ring 7 is welded inside the end cover 6.

Set up the gas outlet on end cover 6, noise and air get into from air cleaner's side, discharge from the gas outlet after filtering and amortization, be connected with the engine for convenient whole air cleaner, cassette 8 has been set up on end cover 6, the cassette cover is on the outer wall of end cover, be connected with the engine through fastening bolt on the cassette 8, gas outlet department of end cover 6 sets up damping pad 9, damping pad can be on the thin wall of end cover, play effectual buffering and the effect of damping through damping pad when the engine produces the shake, and then very big reduction air cleaner's vibration frequency and amplitude, the impact of vibration to air cleaner has been reduced, air cleaner's life has been improved.

The bottom cover 1 is in a disc shape and plays a certain supporting role in the overall structure of the air filter.

Inner frame 5 and exoskeleton 3 are made by the wire netting, have certain space between inner frame and the exoskeleton for place and inhale sound cotton 4 and filtering layer 3, inhale sound cotton 4 and set up at the inlayer, filtering layer 3 sets up at the skin.

Superfine fiber filter paper can be selected as the filter layer 3, impurities can be effectively filtered, and the filter layer has the advantage of being high in dirt storage capacity.

The sound absorption cotton 4 is polyester sponge and is a porous medium, when sound waves pass through the sound absorption cotton, the sound waves are reflected, overlapped and collided with each other through the small holes, and sound wave energy is converted into heat energy, so that the intensity of the sound waves is weakened.

The filtering layer filters the air entering the air filter, the sound absorbing cotton reduces the noise entering the air filter, high-frequency noise is absorbed, and partial air inlet noise can be reduced.

The silencing ring 7 is arranged inside the end cover 6 in a welding mode, is a thin metal sheet and is preferably made of aluminum; the silencing ring 7 is in a horn-shaped circular ring shape, namely the section of the silencing ring is reduced from large to small.

The silencing principle of the silencing ring is as follows: when noise passes through the silencing ring, sound waves propagated along the pipeline are reflected back to the sound source direction due to sudden change of the section of the pipeline, namely, the change of acoustic impedance, so that the purpose of reducing noise is achieved, the silencing ring can insulate sound of noise radiated from the flow widening groove, and meanwhile, the airflow guiding effect can be achieved.

In some embodiments, the damping pad is preferably made of rubber.

The noise reduction principle of the air filter is as follows:

as shown in fig. 1 and 2, BPF noise generated by the supercharger 10 has high frequency, is sharp in subjective feeling, is squealing, and is poor in comfort, noise generated by the flow widening groove 12 enters the air inlet duct 11, then sequentially passes through the outer framework 2, the filter layer 3, the sound absorbing cotton 4 and the inner framework 5 of the air filter 13 and enters the air filter 13, and when the noise passes through the sound absorbing cotton 4, the noise absorbs high-frequency noise in the noise, and meanwhile, low part of the air inlet noise can be absorbed; when passing through the silencing ring 7, the silencing ring 7 further reduces noise, and sound insulation of the noise radiated from the flow widening grooves 12 is realized.

The air in the air inlet pipeline 11 enters the air filter 13 after being filtered by the filter layer 3, and is discharged out of the air filter 13 from the air outlet under the flow guiding action of the silencing ring 7.

The air filter in the embodiment can play a role in remarkably reducing BPF (back pressure filter) noise of the supercharger, particularly can insulate the sound of the noise radiated from the flow widening groove, and the noise is reduced without changing the structure of the supercharger and influencing the performance of the supercharger; proved by verification, the structure of the air filter can comprehensively reduce the BPF noise of the supercharger by more than 2 dBA-4 dBA.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The air filter for reducing the BPF noise of the supercharger is characterized by comprising an end cover, a bottom cover and a framework, wherein a silencing ring is arranged inside the end cover; the framework comprises an inner framework and an outer framework, and sound-absorbing cotton and a filter layer are sequentially arranged between the inner framework and the outer framework from inside to outside; the framework is arranged between the bottom cover and the end cover to form a cavity.

2. The air cleaner for reducing BPF noise of a supercharger according to claim 1, wherein the end cap is provided with a clamping band, and the clamping band is sleeved on the outer wall of the end cap.

3. The air cleaner of claim 1, wherein vibration dampening pads are provided on ends of the end caps.

4. The air cleaner of claim 1, wherein the end cap includes an air outlet.

5. The air cleaner of claim 1, wherein the silencer ring is made of metal.

6. The air cleaner of claim 1, wherein the silencer ring is secured to an inner side of the end cap by welding.

7. The air cleaner of claim 6, wherein the silencer ring is of an annular structure, and the inner cross-sectional area of the silencer ring is reduced from large to small.

8. The air cleaner of claim 3, wherein the damping pad is made of rubber.

9. The air cleaner of claim 1, wherein the inner frame and the outer frame are made of wire mesh.

10. The air cleaner of claim 1, wherein the filter layer is ultra fine fiber filter paper.

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