CN105673170A - Internal sound absorption type resonance silencer - Google Patents

Abstract

A jack-post type central sound absorption body is arranged in a shell cavity of an engine silencer and used for absorbing noise waves and reflected waves of noise to a cavity wall plate in the cavity. A composite structure silencer cavity shell plate with a sandwiched sound absorption layer is used for blocking and absorbing secondary shock excitation noise waves of high-speed airflow and the noise waves to a silencer shell. The high-speed airflow expands and reverberates engine exhaust noise without restriction in the integral silencer shell cavity with a resonant cavity, and the multi-level micropore filtering effect in the silencer shell cavity, the Helmholtz resonance principle silencing effect of the resonant cavity and the micropore filtering effect of micropore plates of the resonant cavity act together, so that the better noise reduction effect is achieved under a small-structure space arrangement condition of the engine silencer, and engine power loss is small. The internally arranged resonant cavity (a plate body), the central sound absorption body and the composite structure silencer cavity shell plate with the sandwiched sound absorption layer are the basic structure characteristics of the silencer.

Description

Interior sound-absorbing resonance noise elimination device

Technical field

The present invention relates to the toxic emission muffler of explosive motor, the composite construction silencer chamber coverboard of the resonator cavity inside set (plate body), center acoustic(al)absorbent and folder sound absorbing layer constitutes the basic structural feature of acoustic filter. Engine high-efficiency acoustic filter solution that the purpose of the present invention aims to provide a kind of higher noise reduction usefulness, that arrange at little space structure.

Background technology

Existing add resonator cavity (plate body) though resonator-type silencer have been provided for a kind of little space structure arrange under engine high-efficiency acoustic filter solution (refer to " resonance noise elimination device, application number: 2014106192255 "), but waste gas is after resonator cavity (plate body), acoustic filter shell plates still can be impacted by the air pulse formed with the stroke ventilation of electromotor, secondary to a certain extent impulse noise waves and outwards distribute, as further reduced noise and ensure the efficient performance of acoustic filter, it is accomplished by the secondary noise waves that impulses is retrained and controlled. the present invention is aiming at providing a kind of in this and controls and reduce the solution that the noise waves that impulses outwards distributes, it is achieved the noise reduction that muffler for motor is higher under little space structure arrangement condition requires and performance.

Summary of the invention

First architectural feature of the present invention, except comprising resonator-type silencer existing resonator cavity (plate body) architectural feature, be loaded on the feature structure of the jack-post formula acoustic(al)absorbent at suppressor case center in also including, for absorb acoustic filter coverboard wall toward the gentle stream of noise waves of interflection by resonator cavity (plate body) after with the remaining high-frequency noise ripple of band. Barrel on jack-post formula acoustic(al)absorbent is micropore metal sheet, filling sound-absorbing material in barrel, and sound-absorbing material is fire proofing firbre or cavity structural material. The secondary noise waves that impulses when noise waves and the gas shock suppressor case plate of air-flow body companion, occur mirror to echo reflection when meeting wooden partition and stopping, because suppressor case plate is the Specular reflection face of inner arc surface, when echo is toward interflection, some echoes gather to suppressor case central axis direction, and penetrate jack-post formula acoustic(al)absorbent and absorbed. So, in acoustic filter work, waste gas is after resonator cavity (plate body), the pneumatic noise ripple of enclosure interior and controlled at the noise waves that impulses that wallboard is secondary and absorb, and reduces the noise waves of acoustic filter shell intracavity and outwards discharges and distribute.

Second architectural feature of the present invention is: the composite construction silencer chamber coverboard structure of folder sound absorbing layer. the silencer chamber coverboard of composite construction is early existing to be existed, effect is to absorb the exhaust noise of electromotor by the method for resistive absorption and reduce secondary chamber coverboard and impulse noise waves, current way is to paste sound-absorbing material at chamber coverboard inner surface, then with wire netting, web plate or micropore metal sheet press solidly sound absorbing layer, but, the composite construction chamber coverboard Shortcomings to a certain extent of this frame mode and limitation, sound absorbing layer directly contacts with high-speed exhaust gas stream, and exhaust gas flow direction is that large area is cut and swept sound absorbing layer top layer, between air-flow and sound absorbing layer surface, objective reality the negative relative phenomenon of fluid flowing, sound absorbing layer material is easily started gradually successively to peel off by this suction function from top layer, this effective utilization not only having influence on acoustic filter and life-span, also the particulate matter and the harmful substance that make engine emission increase. solution provided by the invention is that sound absorbing layer does not directly contact with high-speed exhaust gas stream, and it is wrapped around the outer surface of acoustic filter inner chamber coverboard, then on sound absorbing layer, it is coated with the exocoel coverboard of acoustic filter again, it is the centre that sound absorbing layer is clipped in inside and outside chamber coverboard, forms structure and the feature of the composite construction silencer chamber coverboard of folder sound absorbing layer. when waste gas stream expands reverberation in silencer chamber shell and impacts suppressor case inside panel, because air-flow and the secondary noise waves that impulses of sound wave pulse are absorbed by middle sound-absorbing interlayer and weaken on inner chamber coverboard, and exocoel coverboard is because overlaying on sound absorbing layer, vibration damping strengthens, the energy of the secondary noise waves that impulses also greatly disappears, plus the obstruct to sound wave of the inside and outside two-layer chamber coverboard, especially the obstruct to high frequency noise, and the resistive absorption advantage that sound-absorbing interlayer is to noise waves, limit noise waves and outwards distribute through acoustic filter coverboard. on the other hand, owing to being the composite construction of folder sound absorbing layer, the vibratility of suppressor case itself can be little, and the emission of secondary hull vibration noise wave direction hull outside can be greatly reduced.

Because composite construction chamber coverboard mainly controls the secondary noise waves that impulses, the shell plates adopting thin-walled material also easily reaches noise reduction purpose, result of the comparison shows, do not have obvious overall dimension after the coverboard of resonator-type silencer folder sound absorbing layer composite construction chamber to increase, physical dimension can be reduced even, thus realizing optimizing further the high noise reduction usefulness of muffler for motor under the arrangement condition of little space.

Accompanying drawing explanation

Fig. 1 is the axonometric chart of the interior sound-absorbing resonance noise elimination device of the embodiment of the present invention.

Fig. 2 is the main member decomposition view of the interior sound-absorbing resonance noise elimination device of the embodiment of the present invention.

Fig. 3 is the acoustic filter concept view of the interior sound-absorbing resonance noise elimination device of the embodiment of the present invention.

Fig. 4 is the cross-sectional profile top view after Fig. 3 removes upper end cover.

Detailed description of the invention

Mode by the examples below further illustrates the present invention, but does not therefore limit the present invention among described scope of embodiments.

As depicted in figs. 1 and 2, suppressor case adopts drum, and in each metal sheet structure closes, sound-absorbing resonance noise elimination device is an assembly, and main composition part includes:

Part 1, for the upper end cover of sealed cylinder port;

Part 2, the sound absorbing layer of the close air inlet being made up of fire proofing firbre or cavity structural material;

Part 3, for sealing the micropore metal sheet of pressure sound absorbing layer;

Part 4, with the muffler inlet pipe of fagging flange, flange, for connecting the Waste gas outlet on electromotor, inserts one end of housing with some suitable apertures of giving vent to anger;

Part 5, acoustic filter resonator cavity, cavity is made up of the micropore metal sheet of upper and lower two pieces of different pore sizes;

Part 6, jack-post formula acoustic(al)absorbent, inside it is loaded on suppressor case center, tubular wallboard is micropore metal sheet, filling sound-absorbing material in barrel, and sound-absorbing material is the material of fire proofing firbre or pore space structure;

Part 7, for sealing the micropore metal sheet being pressed against nearly muffler outlet tube side sound absorbing layer, with part 5, part 6 be linked to be altogether " H " shape, be contained in the sub-unit component within suppressor case;

Part 8, the inner barrel of acoustic filter composite construction chamber coverboard cylinder, use thin metallic tubd;

Part 9, the airflow outlet pipe of acoustic filter, body inlet port is furnished with some suitable, and for the small air inlet hole that gas flows into, body outlet port is mouth of pipe through hole;

Part 10, the thickening sound absorbing layer being made up of fire proofing firbre or cavity structural material;

Part 11, for the bottom end cover of sealed cylinder port;

Part 12, the sound-absorbing interlayer of acoustic filter composite construction chamber coverboard cylinder, sandwich material is fire proofing firbre or cavity structural material;

Part 13, the urceolus plate of acoustic filter composite construction chamber coverboard cylinder, material is sheet metal;

Part 14, the anti-scald protecting wire net of silencer cylinder.

Form one from part 1 to part 11 and do not include into (going out) mouth of pipe, sealing acoustic filter inner housing chamber, part 8 is inner barrel, wherein, one end of jack-post formula acoustic(al)absorbent part 6 is connected with the resonator cavity 5 of acoustic filter, the other end is connected with the micropore thin sheet metal pieces 7 of envelope pressure sound absorbing layer, three's (part 5, part 6 and part 7) is linked to be the sub-unit of " H " shape altogether, is contained in the middle part of suppressor case chamber; Shown in Fig. 3, the muffler inlet pipe fitting 4 with fagging flange is plugged on cylinder, and position is in the position beyond the sub-unit of " H " shape, and exporting pipe fitting 9 is be plugged on cylinder from the position within the sub-unit of " H " shape; The two ends of inner housing chamber are also each equipped with sound absorbing layer part 2 and part 10, micropore thin sheet metal pieces 5 and part 7 press solidly. It addition, be coated with sound-absorbing interlayer part 12 on inner barrel part 8, and wrapped up in bag by urceolus plate 13, the composite construction chamber coverboard of three's (part 8, part 12, part 13) synthesis silencer cylinder folder sound absorbing layer. Scald-proof netware 14 is contained on silencer cylinder. In the present embodiment, the connection between each component of composition muffler ASSY, except sound-absorbing material, it is and is welded to connect, but the port position of cylinder can also be tightly connected with press-sealing process, each cylinder pipe fitting also can rolled forming.

As shown in Fig. 2 and Fig. 3～4, after the waste gas entrance muffler inlet pipe fitting 4 that electromotor is discharged, the acoustic filter inner housing chamber being made up of part 1, part 8 and part 11 is flow to from its aperture of giving vent to anger, the lower position in resonator cavity part 5 to housing chamber is initially passed through in the inside in housing chamber, then pass through the small air inlet hole of outlet, finally discharge from the mouth of pipe of outlet. this gas flow to in the process flowed out, exhaust hole in inlet fitting 4, two pieces of microwell plate micropores up and down of resonator cavity part 5, gradually waste gas is filtered and smooths, with the high-frequency noise ripple of band, the high-speed exhaust gas stream impulse wave that the ventilation of a part of stroke produces with the small air inlet hole on outlet, due to corresponding respectively on each component be the aperture of different breeder tube, thus it is wide in range to reach response range, the high-frequency noise ripple filter effect that degree of overlapping is high, simultaneously, gas column layer is formed between two microwell plates when air-flow is through resonator cavity part 5, and noise waves resonance, absorption of noise ripple under helmholtz resonance principle noise elimination gas column layer effect, this is the first aspect of Noise Reduction,

Second aspect, owing to the microwell plate of composition resonator cavity (plate body) is microporous high density plate and cavity laying micropore, metering function when air-flow passes through is limited, expansion decompression and reverberation that high velocity air can hinder without mobility at housing intracavity discharge unit kinetic energy, absorb, weaken and suppress electromotor because discharging the gas shock noise that waste gas produces when stroke is taken a breath preferably, meanwhile, a this body structure of formation, the structure space of acoustic filter is corresponding less;

The third aspect, the composite construction silencer chamber coverboard of folder sound absorbing layer, stop, absorb and limit secondary noise waves and the secondary noise waves energy that impulses of impulsing to external diffusion;

Fourth aspect, in acoustic filter inner housing chamber arrange jack-post formula acoustic(al)absorbent part 6, as previously mentioned, from the coverboard wall of acoustic filter inner shell body cavity absorb toward interflection the gentle stream of noise waves by after resonator cavity (plate body) with the remaining high-frequency noise ripple of band, the noise waves of minimizing acoustic filter shell intracavity outwards discharges and distributes.

In sum, it is provided that embodiment be the decrease of noise functions that from first to the 4th these 4 aspects realize acoustic filter, wherein, the composite construction silencer chamber coverboard of jack-post formula acoustic(al)absorbent and folder sound absorbing layer is that present invention emphasis in this enforcement case embodies.

In the present embodiment, the noise reduction reference controlling value of the present invention is: the noise emission limit value of electromotor GS authentication requesting. Objective for implementation is that a little structure space is arranged, added the set of variable-frequency power generation unit of single-cylinder four-stroke engine that is high-power and that raise speed, and after adopting the present invention, generating set work noise meets and exceeds the noise emission limit value of GS authentication requesting.

The embodiment of this disclosure is only provide a concrete example of embodiment and method, rather than the whole and restriction of the invention process case, in the feature and characteristic range of the present invention, can also be used with alternate manner and method realizes the present invention, related to this, appending claims describes ownership scope and the opinion of the present invention.

Claims (5)

1. a muffler for motor, it is characterized in that, it includes, including the silencer cylinder of a composite construction chamber coverboard pressing from both sides sound absorbing layer, for the upper and lower end cap of sealed cylinder port and enter the anti-scald protecting wire net on (going out) mouth pipe and silencer cylinder; Two the end sound absorbing layers being only affixed to cylinder end plate are also included in inside, with the air-flow resonator cavity being made up of two pieces of high density micropore metal thin plates, the jack-post formula acoustic(al)absorbent of one casing center being loaded on acoustic filter, wherein, jack-post formula acoustic(al)absorbent is respectively connected with air-flow resonator cavity and a micropore metal sheet sealing pressure side sound absorbing layer, and jack-post formula acoustic(al)absorbent, air-flow resonator cavity and micropore metal sheet form the sub-unit part of " H " configuration altogether; Acoustic filter is except sound-absorbing material, and basic constituent material is metal-sheet parts, is linked to be a total member with air inlet/outlet and chamber by the mode welded with pressing.

2. muffler for motor according to claim 1, it is characterized in that, described muffler for motor is except comprising resonator-type silencer existing resonator cavity (plate body) architectural feature, the feature structure of the jack-post formula acoustic(al)absorbent at suppressor case center it is loaded in also including, barrel on jack-post formula acoustic(al)absorbent is micropore metal sheet, filling sound-absorbing material in barrel, sound-absorbing material is fire proofing firbre or cavity structural material; Jack-post formula acoustic(al)absorbent one end is connected in the planar central of resonator cavity (plate body), and the other end is connected in the planar central of the micropore metal sheet of an envelope pressure side sound absorbing layer, and the sub-unit part that three is connected to form constitutes the architectural feature of " H " type.

3. muffler for motor according to claim 1, it is characterized in that, the feature structure of the composite construction silencer chamber coverboard of folder sound absorbing layer, suppressor case sound absorbing layer is wrapped in the outer surface of inner chamber coverboard, exocoel coverboard is coated with sound absorbing layer again, sound absorbing layer is intermediate layer, is sandwiched in the centre of inside and outside chamber coverboard.

4. muffler for motor according to claim 1, it is characterised in that the plug-in position of inlet tube inserting silencer cylinder is the position beyond the sub-unit of " H " shape, the plug-in position of outlet is within the sub-unit of " H " shape on the cylinder at position.

5. muffler for motor according to claim 1, it is characterised in that the architectural feature in suppressor case chamber is an integral type cavity including " H " type sub-unit component.