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Composite muffler for diesel generating set

A diesel generator set and composite technology, applied in the direction of engine components, machines/engines, mechanical equipment, etc., can solve the problems of large volume, narrow muffler frequency band of the first-stage muffler, no heat insulation, etc. Function, the effect of low transmission loss

Active Publication Date: 2019-06-04
SHENYANG AEROSPACE XINGUANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems existing in the above-mentioned prior art, the present invention proposes a composite muffler for diesel generator sets, which solves the problems of narrow muffler frequency band, large volume, and no heat insulation of the first-stage muffler in the prior art. Corrosion, anechoic frequency bandwidth, small transmission loss, reduced smoke emission and light weight

Method used

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  • Composite muffler for diesel generating set
  • Composite muffler for diesel generating set
  • Composite muffler for diesel generating set

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A composite muffler for a diesel generator set, comprising an intake pipe, a resistive noise reduction structure connected in series with the intake pipe, a resistive noise reduction structure arranged inside the resistive noise reduction structure, and an outlet pipe connected in series with the resistive noise reduction structure The air pipe, the resistive sound attenuation structure is composed of the muffler shell, the sound absorbing material and the resonant perforated plate in order from outside to inside.

[0027] In the resistive noise reduction structure, the resonant perforated plate not only plays a supporting role, but also is a resonance noise reduction structure to enhance the acoustic performance of the muffler; the energy is absorbed through the sound-absorbing material, and the middle and high-frequency noise is absorbed and silenced through the sound-absorbing material. The resonant perforated board has perforations, and the noise reaches the sound-ab...

Embodiment 2

[0040] On the basis of Embodiment 1, this embodiment proposes a preferred structure.

[0041] The length of the first-level inner cannula located in the expansion chamber I is one quarter of that of the expansion chamber I, and the length of the first-level inner cannula located in the expansion chamber II is one-half of the expansion chamber II one;

[0042] The length of the secondary internal cannula located in the expansion chamber II is 1 / 4 of the expansion chamber II, and the length of the secondary internal cannula located in the expansion chamber III is 1 / 2 of the expansion chamber III one.

[0043] Compared with the technical solution in Example 1, the technical solution provided in this example belongs to a preferred solution in Example 1, so that the expansion ratio design among the expansion chamber I, expansion chamber II and expansion chamber III is It is more reasonable, the transmission loss effect is lower, and the sound absorption effect is better.

Embodiment 3

[0045] On the basis of all the foregoing embodiments, in order to further improve the sound absorption effect, this embodiment provides an improved technical solution.

[0046] An acoustic spike is added to the pipe head of the outlet pipe located inside the expansion chamber III. The chisel is welded with the exhaust pipe, and the chisel adopts a cone structure. This structure makes the flow resistance of the air flow lower than that of the chisel, and can effectively absorb the middle and high frequency noise; the cone surface of the chisel There are a plurality of through holes for exhaust, and the opening ratio of the through holes is designed according to the exhaust characteristics of the diesel engine; the sound wedge is filled with stainless steel wire, which can reduce the exhaust smoke and enhance the environmental protection of the muffler.

[0047] In all the above-mentioned embodiments, the pipeline of the air inlet pipe located inside the expansion chamber I is d...

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Abstract

The invention relates to a silencer applied to the field of silencing and noise reduction for internal combustion engines, in particular to a complex silencer for a diesel generator unit. The complex silencer for a diesel generator unit comprises an intake tube, a dissipative silencing structure connected with the intake tube in series, a resistant silencing structure arranged inside the dissipative silencing structure, and a gas outlet tube connected with the dissipative silencing structure in series, wherein three expansion chambers are formed by a resonance perforated plate, a first-level resistant baffle and a second-level resistant baffle together, and are arranged in the direction from the intake tube to the gas outlet tube in the order of the first expansion chamber, the second expansion chamber and the third expansion chamber. Because the dissipative silencing structure and the resistant silencing structure are connected in series for use, the range of the silencing frequency band is broader; and making use of different expansion ratios, the passing frequency of exhaust flow is increased, the peak value of silencing of the silencer can be large, and the silencing capacity can be increased. The complex silencer for a diesel generator unit has the advantages of being broad in silencing frequency band, small in volume, simple in structure, low in transmission loss and light in integral weight. Meanwhile, the effect of improving the anticorrosion function is achieved by using metal tubes and metal plates.

Description

technical field [0001] The invention relates to a muffler used in the field of noise reduction for internal combustion engines, in particular to a composite muffler for a diesel generator set, which can be used in a noise reduction system of a high-performance silent diesel generator set. Background technique [0002] Smoke exhaust mufflers can be divided into resistive mufflers, resistive mufflers, and impedance compound mufflers according to their principles. The resistant muffler uses the sudden change in the section of the pipeline or the side-connected resonant cavity, so that certain frequency sound waves propagating along the pipeline will reflect and interfere at the sudden change in the section, so as to achieve the purpose of noise reduction. The resistant muffler has good middle and low frequency noise reduction characteristics. Resistive mufflers can be regarded as energy-absorbing mufflers, which use sound waves to pass through porous sound-absorbing materials,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N1/04
CPCF01N1/04F01N2530/02
Inventor 崔再铎王宝新景月张春艳祝贺利
Owner SHENYANG AEROSPACE XINGUANG GRP
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