CN112128083A - Noise reduction method for air inlet pipeline of whole vehicle air compressor and noise reduction wavelength tube - Google Patents
Noise reduction method for air inlet pipeline of whole vehicle air compressor and noise reduction wavelength tube Download PDFInfo
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- CN112128083A CN112128083A CN202011184240.3A CN202011184240A CN112128083A CN 112128083 A CN112128083 A CN 112128083A CN 202011184240 A CN202011184240 A CN 202011184240A CN 112128083 A CN112128083 A CN 112128083A
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- Prior art keywords
- air inlet
- inlet pipeline
- noise reduction
- tube
- pipe
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/123—Fluid connections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0027—Pulsation and noise damping means
- F04B39/0055—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes
Abstract
The invention discloses a noise reduction method for an air inlet pipeline of an air compressor of a whole vehicle, which comprises the following steps of: firstly, testing the air inlet noise spectrum of the whole vehicle, and identifying the wavelength lambda of the sound wave with the maximum noise; then, a closed reflection pipe with the length L of 1/5 lambda to 1/3 lambda is arranged on the air inlet pipeline to absorb noise sound waves. The invention also discloses a noise reduction wavelength tube. The invention discloses a noise reduction method for an air inlet pipeline of a whole vehicle air compressor and a noise reduction wavelength tube, belonging to the technical field of engines.
Description
Technical Field
The invention relates to an engine technology, in particular to a noise reduction method and a noise reduction wave pipe for an air inlet pipeline of an air compressor of a whole vehicle.
Background
At present, fuel oil and gas commercial automobiles at home and abroad are generally provided with an air compressor to provide compressed air for auxiliary braking. The air inlet of the air compressor is guided by an air inlet pipeline behind an air filter of the engine and in front of a supercharger air compressor, and due to structural arrangement reasons, when most vehicles work at the air compressor, air shunting of the air compressor can cause abnormal noise of the air inlet pipeline of the engine, which is commonly called inflating noise.
Some passenger cars, high-end passenger cars and trucks may design a dedicated helmholtz noise-damping cavity with reference to an exhaust muffler, but the structure is expensive and general vehicles are not equipped with the helmholtz noise-damping cavity.
Disclosure of Invention
The invention aims to solve the technical problems of the prior art, and aims to provide a noise reduction method for an air inlet pipeline of a whole vehicle air compressor, which has a good noise reduction effect.
The second objective of the present invention is to provide a noise reduction wavelength tube.
In order to achieve the first purpose, the invention provides a noise reduction method for an air inlet pipeline of an air compressor of a whole vehicle, which comprises the following steps: firstly, testing the air inlet noise spectrum of the whole vehicle, and identifying the wavelength lambda of the sound wave with the maximum noise; then, a closed reflection pipe with the length L of 1/5 lambda to 1/3 lambda is arranged on the air inlet pipeline to absorb noise sound waves.
Furthermore, a blocking structure is arranged at the end part of the closed reflecting tube.
Further, the length L of the closed reflection tube is 1/4 lambda.
Furthermore, the air inlet pipeline comprises an air compressor opening connecting section, an engine air inlet pipeline opening connecting section and a straight pipe section, the air compressor opening connecting section and the engine air inlet pipeline opening connecting section are arranged at two ends of the air inlet pipeline, the straight pipe section is arranged in the middle of the air inlet pipeline, and the closed reflection pipe is perpendicular to the straight pipe section.
Furthermore, the straight pipe section is of a hard pipe structure, and the opening connecting section of the air compressor and the opening connecting section of the engine air inlet pipeline are of flexible pipe structures capable of being bent.
In order to achieve the second purpose, the invention also provides a noise reduction wavelength tube for realizing the noise reduction method of the air inlet pipeline of the whole vehicle air compressor, which comprises the air inlet pipeline, an air inlet and an air outlet, wherein the air inlet pipeline is vertically provided with a closed reflection tube, and the end part of the closed reflection tube is provided with a blocking structure.
Further, the length L of the closed reflection tube is 1/4 lambda.
Furthermore, the air inlet pipeline comprises an air compressor opening connecting section, an engine air inlet pipeline opening connecting section and a straight pipe section, the air compressor opening connecting section and the engine air inlet pipeline opening connecting section are arranged at two ends of the air inlet pipeline, the straight pipe section is arranged in the middle of the air inlet pipeline, and the closed reflection pipe is perpendicular to the straight pipe section.
Furthermore, the straight pipe section is of a hard pipe structure, and the opening connecting section of the air compressor and the opening connecting section of the engine air inlet pipeline are of flexible pipe structures capable of being bent.
Furthermore, the closed reflection pipe is arranged at one end, close to the opening connecting section of the engine air inlet pipeline, of the straight pipe section.
Advantageous effects
Compared with the prior art, the noise reduction method for the air inlet pipeline of the whole vehicle air compressor and the noise reduction wave pipe have the following beneficial effects:
according to the noise reduction method for the air inlet pipeline of the whole vehicle air compressor and the noise reduction long pipe, the closed reflecting pipe is arranged on the air inlet pipeline, and the noise sound wave is greatly weakened by utilizing the principle that the sine wave and the reflected cosine wave can be mutually offset, so that the air compressor inflating noise is reduced, the structure is simpler, the cost is cheaper, and the noise reduction long pipe is more easily accepted by customers.
Drawings
Fig. 1 is a schematic structural diagram of a noise reduction method and a noise reduction wave pipe for an air inlet pipeline of a whole vehicle air compressor.
In the figure: 1. an air intake line; 11. an air compressor opening connecting section; 12. a straight pipe section; 13. an engine air inlet pipeline opening connecting section; 2. a closed reflection tube; 3. and (4) a plugging structure.
Detailed Description
The invention is further described below with reference to examples, but not to be construed as being limited thereto, and any number of modifications which can be made by anyone within the scope of the claims are also within the scope of the claims.
Specific embodiments of the present invention are such that: referring to fig. 1, a noise reduction method for an air inlet pipeline of an air compressor of a whole vehicle comprises the following steps: firstly, testing the air inlet noise spectrum of the whole vehicle, and identifying the wavelength lambda of the sound wave with the maximum noise; then, a closed reflection pipe 2 having a length L is provided in the intake pipe 1 to absorb the noise sound wave. In the noise reduction method for the air inlet pipeline of the whole vehicle air compressor, the closed reflecting pipe 2 is arranged on the air inlet pipeline 1, and the noise sound wave is a sine wave, the sound wave is transmitted to the end part in the closed reflecting pipe 2 with the length L of 1/5 lambda to 1/3 lambda, and then the reflected wave reflected back is a cosine wave, and the sine wave and the cosine wave can be mutually offset, so that the noise can be absorbed through the closed reflecting pipe 2, and the noise sound wave is greatly weakened, so that the air compressor inflating noise is reduced, the structure is simpler, the cost is cheaper, and the noise reduction method is more easily accepted by customers.
In this embodiment, the end of the closed reflection tube 2 is provided with a blocking structure 3, and the blocking structure 3 is a nut structure.
In the present embodiment, the length L of the closed reflection pipe 2 is 1/4 λ, which can cancel or absorb most of the sound wave of the maximum noise, and at the same time absorb some of the noise of other frequencies.
In this embodiment, the air intake pipeline 1 includes an air compressor opening connecting section 11, an engine air intake pipeline opening connecting section 13 and a straight pipe section 12, the air compressor opening connecting section 11 and the engine air intake pipeline opening connecting section are arranged at two ends of the air intake pipeline, the straight pipe section 12 is arranged in the middle of the air intake pipeline, the closed reflection pipe 2 is perpendicular to the straight pipe section 12, and the closed reflection pipe 2 is communicated with the straight pipe section 12.
In the present embodiment, the straight pipe section 12 is a hard pipe structure, so that sound waves can be propagated straight along the axial direction of the pipe section, so that the vertically arranged closed reflection pipe 2 can attenuate the sound waves of noise; the air compressor opening connecting section 11 and the engine air inlet pipeline opening connecting section 13 are flexible hose structures which can be bent, are convenient to connect and are suitable for structural arrangement in an engine cabin.
The utility model provides a wavelength tube of making an uproar falls, includes air inlet pipeline 1, air inlet and gas outlet, is equipped with perpendicularly on the air inlet pipeline 1 and closes a mouth reflecting tube 2, and the tip that closes a mouth reflecting tube 2 is equipped with block structure 3, and block structure 3 is the nut structure, simple to operate, and the dismouting is quick.
In the present embodiment, the length L of the closed reflection pipe 2 is 1/4 λ.
In this embodiment, the air intake pipeline 1 includes an air compressor opening connecting section 11, an engine air intake pipeline opening connecting section 13 and a straight pipe section 12, the air compressor opening connecting section 11, the engine air intake pipeline opening connecting section 13 and the straight pipe section 12 are arranged in the middle, the closed reflection pipe 2 is perpendicular to the straight pipe section 12, and the length of the straight pipe section 12 is at least 4L, so that noise can be sinusoidally transmitted in the straight pipe section 12 along the axial direction of the pipe section.
In this embodiment, the straight pipe section 12 is of a rigid pipe structure, and the air compressor opening connection section 11 and the engine intake pipe opening connection section 13 are of a bendable hose structure.
In the present embodiment, the closed reflection pipe 2 is arranged at one end of the straight pipe section 12 close to the engine inlet pipe opening connecting section 13, namely close to the air outlet, so that more noise generated by the flow of air can be weakened.
The above is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that several variations and modifications can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the utility of the patent.
Claims (10)
1. A noise reduction method for an air inlet pipeline of an air compressor of a whole vehicle is characterized by comprising the following steps: firstly, testing the air inlet noise spectrum of the whole vehicle, and identifying the wavelength lambda of the sound wave with the maximum noise; then, a closed reflection pipe (2) having a length L of 1/5 lambda to 1/3 lambda is provided in the intake pipe (1) to absorb the noise sound wave.
2. The noise reduction method for the air inlet pipeline of the whole vehicle air compressor as claimed in claim 1, wherein a blocking structure (3) is arranged at the end part of the closed reflection pipe (2).
3. The noise reduction method for the air inlet pipeline of the whole vehicle air compressor as claimed in claim 1, wherein the length L of the closed reflection pipe (2) is 1/4 lambda.
4. The noise reduction method for the air inlet pipeline of the whole vehicle air compressor as claimed in claim 1, 2 or 3, wherein the air inlet pipeline (1) comprises an air compressor opening connecting section (11) arranged at two ends, an engine air inlet pipeline opening connecting section (13) and a straight pipe section (12) arranged in the middle, and the closed reflecting pipe (2) is arranged perpendicular to the straight pipe section (12).
5. The noise reduction method for the air inlet pipeline of the whole vehicle air compressor as claimed in claim 4, wherein the straight pipe section (12) is of a hard pipe structure, and the air compressor opening connecting section (11) and the engine air inlet pipeline opening connecting section (13) are of flexible pipe structures capable of being bent.
6. The noise reduction wave tube for realizing the noise reduction method of the air inlet pipeline of the whole vehicle air compressor as claimed in claim 1 is characterized by comprising the air inlet pipeline (1), wherein a closed reflecting tube (2) is vertically arranged on the air inlet pipeline (1), and a blocking structure (3) is arranged at the end part of the closed reflecting tube (2).
7. A noise reducing wavelength tube according to claim 6, characterized in that the length L of the closed reflection tube (2) is 1/4 λ.
8. The noise reduction wavelength tube according to claim 6 or 7, wherein the air inlet pipeline (1) comprises an air compressor opening connecting section (11) arranged at two ends, an engine air inlet pipeline opening connecting section (13) and a straight tube section (12) arranged in the middle, and the closed reflection tube (2) is arranged perpendicular to the straight tube section (12).
9. The noise reduction wavelength tube according to claim 8, wherein the straight tube section (12) is a rigid tube structure, and the air compressor opening connection section (11) and the engine intake pipe opening connection section (13) are flexible tube structures capable of bending.
10. A noise reducing wavelength tube according to claim 9, characterized in that the closed reflection tube (2) is arranged at one end of the straight tube section (12) near the engine inlet pipe opening connection section (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011184240.3A CN112128083A (en) | 2020-10-30 | 2020-10-30 | Noise reduction method for air inlet pipeline of whole vehicle air compressor and noise reduction wavelength tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011184240.3A CN112128083A (en) | 2020-10-30 | 2020-10-30 | Noise reduction method for air inlet pipeline of whole vehicle air compressor and noise reduction wavelength tube |
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| Publication Number | Publication Date |
|---|---|
| CN112128083A true CN112128083A (en) | 2020-12-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011184240.3A Pending CN112128083A (en) | 2020-10-30 | 2020-10-30 | Noise reduction method for air inlet pipeline of whole vehicle air compressor and noise reduction wavelength tube |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115199510A (en) * | 2022-07-28 | 2022-10-18 | 摩登汽车有限公司 | Noise control method for electric compressor of new energy automobile |
| WO2024011964A1 (en) * | 2022-07-12 | 2024-01-18 | 合肥美的电冰箱有限公司 | Silencer |
-
2020
- 2020-10-30 CN CN202011184240.3A patent/CN112128083A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024011964A1 (en) * | 2022-07-12 | 2024-01-18 | 合肥美的电冰箱有限公司 | Silencer |
| CN115199510A (en) * | 2022-07-28 | 2022-10-18 | 摩登汽车有限公司 | Noise control method for electric compressor of new energy automobile |
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