CN104047695A

CN104047695A - Novel noise reduction muffler

Info

Publication number: CN104047695A
Application number: CN201310079101.8A
Authority: CN
Inventors: 张冬; 柏传雷
Original assignee: HUAI'AN BINHU MACHINERY CO Ltd
Current assignee: HUAI'AN BINHU MACHINERY CO Ltd
Priority date: 2013-03-13
Filing date: 2013-03-13
Publication date: 2014-09-17

Abstract

The invention discloses a novel noise reduction muffler. A first micro-pore plate (11) and a second micro-pore plate (12) are connected in parallel to a first intermediate connecting pipe (13) and a second intermediate connecting pipe (14) which are vertically arranged; an air outlet pipe (2) is connected to the first intermediate connecting pipe (13); an air inlet pipe (3) is connected to the second intermediate connecting pipe (14); the first micro-pore plate (11), the second micro-pore plate (12), the first intermediate connecting pipe (13) and the second intermediate connecting pipe (14) are arranged in a cavity of a shell (1); the air outlet pipe (2) and the air inlet pipe (3) extend out of the shell (1); a flange (8) is connected to the air inlet pipe (3); an upper end cover (5) sleeves the air outlet pipe (2) and is fixedly connected to one end of the shell (1); a lower end cover (9) sleeves the air inlet pipe (3) and is fixedly connected to the other end of the shell (1) to integrally form the muffler. The novel noise reduction muffler is used for reducing exhaust noises of engines of agricultural machinery and engineering machinery, reducing the power loss of the engines and protecting the hearing loss and the mental and physical health of drivers.

Description

A kind of novel noise abatement noise-reducing silencer

Technical field

The present invention relates to, as the silencing apparatus that reduces exhaust sound, minimizing engine power loss, be specifically related to the engine exhaust noise abatement noise-reducing silencer of farm machinery, engineering machinery.

Background technique

Noise be make people's worry, disagreeable, or even harmful sound, the physical and mental health that affects people that noise pollution is serious, light upset people's normal life, heavy hearing damage, initiation various diseases.Therefore, along with the raising of economic development people's living standard, noise pollution more and more receives publicity, and noise pollution has caused the great attention of country and relevant industrial department already.From China in 1980, promulgated first GB1859-1980 < < internal combustion engine noise determining method > > standard, national Machinery Industry Commission in 1987 has issued GB8194-1987 < < internal combustion engine noise sound power level and has measured engineering method and simplified method > > standard, its Applicable scope is automobile, tractor, fixed, all reciprocating internal combustion engine such as movable type and Small-sized Marine, National Quality & Technology Inspection Bureau issued GB7T1859-2000 standard and stipulated the method for measuring sound pressure level and calculate sound power level on the measurement surface of envelope sound source in June, 2000, provided measurement environment simultaneously, the requirement of surveying instrument, and surface sound level, the computational methods of A weighted sound power level and audio frequency belt 1/3 octave band power stage.

In April, 1986,21 National Bureau of Standards issued GBn259-1986 < < medium and small power diesel engine noise level limit > > standard, this standard is applicable to the reciprocating diesel engine of the middle low power of cylinder below 160mm, to SBTS in 1993 approval issued GB14097-1983 < < medium and small power diesel engine noise level limit > > standard, this standard requires stricter to diesel engine noise, than original noise level limit, lowered 3dB.Demand to equipment noise reduction is more and more urgent, diesel exhaust noise is the Main Noise Sources of Tractor's Noise, exhaust silencer is widely used in reducing engine exhaust noise, and can the quality of Sound Elimination Performance of Mufflers be directly connected to the important accessory that reduce Tractor's Noise, performance machinery peak output.At present, the silencing apparatus kind on market is a lot, by noise-cancelling theory, is divided three classes: reactive muffler, dissipative muffler and impedance complex formula silencing apparatus, reactive muffler has again expansion chamber silencing apparatus, resonant chamber silencing apparatus, interfere type silencing apparatus etc.There is certain deficiency in the silencing apparatus on market now, as the noise of high frequency, intermediate frequency, three different frequencies of low frequency can not be eliminated or reduce to a silencing apparatus simultaneously; Although some silencing apparatuss can reduce the noise of a certain frequency, also loss the power of more motor.

Summary of the invention

The object of the invention is to: a kind of noise abatement noise-reducing silencer is provided, and this silencing apparatus is for reducing the exhaust sound of farm tractor, engineering mechanical device, and engine power is not lost with reducing noise simultaneously.

Technical solution of the present invention is: in the chamber of housing, a clamping plate sound absorption mechanism forms silencing apparatus, described clamping plate sound absorption mechanism comprises connecting leg, steam outlet pipe and suction tude in connecting leg in microwell plate, No. two microwell plates, No., No. two, a microwell plate in parallel and No. two microwell plates on connecting leg in connecting leg, No. two in No. of being arranged above and below, in No. one, on connecting leg, connect steam outlet pipe, in No. two, on connecting leg, connect suction tude, form clamping plate sound absorption mechanism; In connecting leg in a microwell plate of clamping plate sound absorptions mechanism, No. two microwell plates, No., No. two, connecting leg is arranged in the chamber of housing, steam outlet pipe and suction tude are stretched out outside housing, adpting flange in suction tude, upper end cap is enclosed within on steam outlet pipe and connects firmly the one end at housing, lower end cap is enclosed within suction tude and connects firmly the other end at housing, whole formation silencing apparatus.

Wherein, on flange and lower end cap, connect firmly lower stiffening rib.

Wherein, on upper end cap and steam outlet pipe, connect firmly stiffening rib.

Wherein, at housing and upper end cap, lower end cap weld, connect firmly protective net support, protective net connects firmly on protective net support.

Wherein, surface of shell spraying high-temperature coating.

The present invention has the following advantages:

1, in silencing apparatus inner chamber, assemble two middle connecting legs, soundproof effect is good compared with the double-outspreading silencing apparatus of a middle connecting leg, its main cause is suction tude and two the middle connecting legs certain distance that staggers, air-flow enters middle gas tube after turnover, part air-flow must just enter middle gas tube after 1800 turnovers, and the distribution of this Flow Field in Muffler is very regular with vortex arising.

2, each abrupt change of cross-section place of this silencing apparatus all arranges pod apertures, effectively improves flowing of internal gas, reduces the intensity of vortex arising, reduces drag losses.

3, adopt double-deck microwell plate to form inlet air pathway, in air column outside aperture pore-throat on plate and cavity, air forms two clamping plate sound absorption structures, when outside noise frequency is identical with elastic system natural frequency, cause that small aperture place air resonates strongly, produce violent friction, thereby consumed acoustic energy.

4, in suppressor case outside, be fixedly connected with the protective net of some strength and length, in case operator are burned accidentally.

5, suppressor case appearance spraying high-temperature coating, makes Muffler Performance more superior.

Accompanying drawing explanation

Fig. 1 is schematic appearance of the present invention.

Fig. 2 is the clamping plate sound absorption structural scheme of mechanism of Fig. 1.

In figure: 1, housing; 2, steam outlet pipe; 3, suction tude; 4, protective net; 5, upper end cap; 6, upper stiffening rib; 7, lower stiffening rib; 8, flange; 9, lower end cap; 10, protective net support; 11, a microwell plate; 12, No. two microwell plates; 13, connecting leg in No.; 14, connecting leg in No. two.

Embodiment

Below in conjunction with accompanying drawing, further illustrate technical solution of the present invention.

As shown in Figure 1-2, clamping plate sound absorption mechanism is installed in the chamber of housing 1 and forms silencing apparatus, described clamping plate sound absorption mechanism comprises microwell plate 11, No. two microwell plates 12, connecting leg 14, steam outlet pipe 2 and suction tude 3 in connecting leg 13 in No., No. two, a microwell plate 11 in parallel and No. two microwell plates 12 on connecting leg 14 in connecting leg 13, No. two in No. of being arranged above and below, in No. one, on connecting leg 13, connect steam outlet pipe 2, in No. two, on connecting leg 14, connect suction tude 3, form clamping plate sound absorption mechanism; The microwell plate 11 of clamping plate sound absorptions mechanism, No. two microwell plates 12, connecting leg 13 in No., connecting leg 14 is arranged in the chamber of housing 1 in No. two, steam outlet pipe 2 and suction tude 3 are stretched out outside housing 1, in suction tude 3, adpting flange 8, upper end cap 5 is enclosed within on steam outlet pipe 2 and connects firmly the one end at housing 1, lower end cap 9 is enclosed within suction tude 3 and connects firmly the other end at housing 1, whole formation silencing apparatus.

Wherein, on flange 8 and lower end cap 9, connect firmly lower stiffening rib 7.

Wherein, on upper end cap 5 and steam outlet pipe 2, connect firmly stiffening rib 6.

Wherein, at housing 1 and upper end cap 5, lower end cap 9 welds, connect firmly protective net support 10, protective net 4 connects firmly on protective net support 10.

Wherein, housing 1 surface spraying high-temperature coating.

Claims

1. a kind of novel noise abatement noise-reducing silencer of the present invention, it is characterized in that: clamping plate sound absorption mechanism is installed in the chamber of housing (1) and forms silencing apparatus, described clamping plate sound absorption mechanism comprises a microwell plate (11), No. two microwell plates (12), connecting leg in No. one (13), connecting leg in No. two (14), steam outlet pipe (2) and suction tude (3), connecting leg (13) in No. of being arranged above and below, the upper microwell plate (11) in parallel of connecting leg in No. two (14) and No. two microwell plates (12), the upper steam outlet pipe (2) that connects of connecting leg in No. (13), the upper suction tude (3) that connects of connecting leg in No. two (14), form clamping plate sound absorption mechanism, in connecting leg (13) in a microwell plate (11) of clamping plate sound absorptions mechanism, No. two microwell plates (12), No., No. two, connecting leg (14) is arranged in the chamber of housing (1), steam outlet pipe (2) and suction tude (3) are stretched out outside housing (1), the upper adpting flange (8) of suction tude (3), upper end cap (5) is enclosed within steam outlet pipe (2) and goes up and connect firmly the one end in housing (1), lower end cap (9) is enclosed within suction tude (3) and goes up and connect firmly the other end in housing (1), whole formation silencing apparatus.

2. noise abatement noise-reducing silencer according to claim 1, is characterized in that: wherein, on flange (8) and lower end cap (9), connect firmly lower stiffening rib (7).Wherein, on upper end cap (5) and steam outlet pipe (2), connect firmly upper stiffening rib (6).At housing (1) and upper end cap (5), lower end cap (9) weld, connect firmly protective net support (10), protective net (4) connects firmly on protective net support (10).

3. noise abatement noise-reducing silencer according to claim 1, is characterized in that: wherein, and housing (1) surface spraying high-temperature coating.