CN104564285A - Silencer - Google Patents

Abstract

The invention relates to a silencer, and aims to overcome the defects that the efficiency of an engine is influenced by a poor low-and-medium frequency silencing effect and high exhaust resistance of the existing silencer. An outer shell of the silencer disclosed by the invention is divided into an intermediate chamber, an air inlet chamber and an exhaust chamber through partition plates; the intermediate chamber is filled with a sound absorption material; the vertical direction of an air inlet pipe enters the air inlet chamber from the outside of the outer shell; the horizontal section of the air inlet pipe penetrates from the air inlet chamber to the exhaust chamber through the intermediate chamber; an intermediate pipe penetrates from the exhaust chamber to the air inlet chamber through the intermediate chamber; the vertical section of an exhaust pipe penetrates from the exhaust chamber to the outside of the outer shell through the outer shell; the horizontal section of the exhaust pipe penetrates from the exhaust chamber to the air inlet chamber through the intermediate chamber; a ventilation hole is formed in each of the part sections, positioned in the intermediate chamber, of the air inlet pipe, the intermediate pipe and the exhaust pipe for communicating each of the air inlet pipe, the intermediate pipe and the exhaust pipe and the intermediate chamber. The silencer disclosed by the invention is good in silencing effect and low in exhaust resistance.

Description

Silencing apparatus

Technical field

The present invention relates to a kind of silencer, particularly relate to a kind of silencing apparatus.

Background technique

" report of the Chinese environmental noise abatement " display of issuing for 2011, in traffic, industry, construction, the large noise source of life four, construction noise ranks the first with the ratio of 38.3%, and construction noise is mainly derived from the various constructional engineering machineries that job site uses.What require along with ambient noise improves constantly, and the Noise measarement of China's laws and regulations to construction machinery product becomes more and more stricter, and machine external radiation noise and driver's parotic noise limit value reduce year by year; Country II stage noise level limit standard (on January 1st, 2015 comes into effect) is lower 3 decibels more than than the I stage (on December 31,1 day to 2014 January in 2012), brings huge challenge and difficulty to the design and development of construction machinery product.Meanwhile, the prerequisite that China's construction machinery product exports to European market is for meeting the mandatory noise standard of European Union, and the machine external radiation noise of product becomes the technology barriers marching European market; Meanwhile, noise problem is one of important prerequisite determining that construction machinery product is sold in the world, is also one of energy-saving and emission-reduction key technology needing solution badly, signifies the core technology levels such as the travelling comfort of construction machinery product, stability.Moreover too high noise meeting grievous injury driver hearing, does not meet the design aim that people-oriented.

The exhaust sound of construction machinery product is one of Main Noise Sources, and prior art utilizes silencing apparatus to weaken exhaust sound, and effect of its noise elimination depends on the internal structure of silencing apparatus, volume and the matching with motor thereof.Weaken low-frequency noise, in silencing apparatus, often design resonant cavity (its frequency of noise elimination is as shown in Equation 1), then muffler volume will become very large, but due to the restriction in space in engineering, the more difficult requirement meeting sound deadening capacity of its volume, causes the machine external radiation noise of complete machine larger.

$f=\frac{c}{4}\sqrt{\frac{D^2}{\mathrm{\π}\·V\·L}}---\left(1\right)$

In formula: c---the velocity of sound;

D---the diameter of resonance trunnion;

The volume of V---resonant cavity;

L---the length of resonance trunnion;

Existing silencing apparatus has roughly tubular frame, polylith dividing plate is provided with outside in housing cavity, as shown in Figure 1, frame 1 is disposed with the first dividing plate 8 and frame inner chamber is separated into air-inlet cavity 7 by second partition 9, intermediate cavity 6, exhaust cavity 5, suction tude by suction tude 2 by air-inlet cavity 7 and ft connection, intervalve 4 is through intermediate cavity, air-inlet cavity 7 is communicated with exhaust cavity 5, portion's section that wherein intervalve 4 is positioned at intermediate cavity 6 is provided with vent and is communicated with intermediate cavity 6 by intervalve 4, outlet pipe 3 is by exhaust cavity 5 and frame 1 ft connection, the middle part of intervalve is provided with pipeline dividing plate 10.The silencing apparatus medium and low frequency soundproof effect of this structure is poor, and the connecting pipeline in addition between chamber and chamber arranges baffle plate in pipeline dividing plate 10 or chamber, cause exhaust resistance comparatively large, and the lifting of exhaust resistance can affect the efficiency of motor.

Summary of the invention

The object of the invention is to solve that existing silencing apparatus medium and low frequency soundproof effect is poor, the large shortcoming affecting engine efficiency of exhaust resistance, the silencing apparatus that a kind of soundproof effect is good, exhaust resistance is little is provided.

The present invention is the technological scheme realizing its object is such: construct a kind of silencing apparatus, ladle shell body, suction tude, outlet pipe and intervalve, in the inner chamber of frame, dividing plate is set, frame inner chamber is separated into intermediate cavity and is positioned at the air-inlet cavity of intermediate cavity both sides by dividing plate, exhaust cavity, intermediate cavity is filled with sound-absorbing material, suction tude is the bending tube with horizontal segment and vertical section, its vertical section passes the outside of side to frame of frame from air-inlet cavity, exhaust cavity is communicated with the suction tude suction port being positioned at frame outside to exhaust cavity through intermediate cavity from air-inlet cavity by horizontal segment, exhaust cavity is communicated with air-inlet cavity to air-inlet cavity through intermediate cavity from exhaust cavity by intervalve, outlet pipe is the bending tube with horizontal segment and vertical section, its vertical section passes the outside of side to frame of frame from exhaust cavity, air-inlet cavity is communicated with the outlet pipe air outlet being positioned at frame outside to air-inlet cavity through intermediate cavity from exhaust cavity by horizontal segment, suction tude, intervalve, portion's section that outlet pipe is positioned at intermediate cavity is provided with vent by suction tude, intervalve, outlet pipe is communicated with intermediate cavity.The horizontal segment of suction tude, intervalve, outlet pipe horizontal segment are parallel to each other; The horizontal segment three distance between any two of the horizontal segment of suction tude, intervalve, outlet pipe is equal.Wherein the horizontal segment of suction tude is mutually vertical with vertical section; The horizontal segment of outlet pipe is mutually vertical with vertical section.Intermediate cavity is furnished with sound-absorbing material, and it is to improve acoustically effective that suction tude, outlet pipe, intervalve are communicated with by vent with intermediate cavity.The horizontal segment three of the horizontal segment of suction tude, intervalve, outlet pipe is parallel to each other, three's distance is between any two equal, is smooth-going in order to internal gas flow, prevents internal gas flow turbulent flow from causing the generation of frictional noise.

In above-mentioned silencing apparatus, dividing plate also divides and is separated with resonant cavity in frame, and one of them chamber in the chamber adjacent with resonant cavity is communicated with resonant cavity by the trunnion that resonates.Wherein can be positioned at the right side of air-inlet cavity adjacent with air-inlet cavity for resonant cavity, and resonant cavity is communicated with air-inlet cavity through resonance trunnion; Or the left side that resonant cavity is positioned at exhaust cavity is adjacent with exhaust cavity, resonant cavity is communicated with exhaust cavity through resonance trunnion.Resonant cavity is arranged in the side of the described intermediate cavity left and right sides, and such as resonant cavity is between intermediate cavity and exhaust cavity, and resonant cavity communicates with exhaust cavity or intermediate cavity through resonance trunnion; Or resonant cavity is between intermediate cavity and air-inlet cavity, resonant cavity communicates with air-inlet cavity or intermediate cavity through resonance trunnion; The horizontal segment of suction tude, the horizontal segment of outlet pipe, intervalve from air-inlet cavity through intermediate cavity and resonant cavity to exhaust cavity.Resonance trunnion quantity is one or more.

Compared with prior art, its advantage is in the present invention:

1), in intermediate cavity filling sucting sound material absorbs high-frequency noises, and motor exhaust passes through intermediate cavity three times through suction tude, intervalve, outlet pipe, is conducive to noise absorbent;

2), do not establish dividing plate in suction tude, intervalve, outlet pipe, muffler resistance is little, is conducive to improving engine efficiency.

Accompanying drawing explanation

Fig. 1 is the structural representation of existing silencing apparatus;

Fig. 2 is the external structure schematic diagram of silencing apparatus of the present invention;

Fig. 3 is silencing apparatus internal structure schematic diagram (echelon sectional view) of the present invention;

Fig. 4 is the sectional elevation of silencing apparatus of the present invention at intermediate cavity position.

In figure: frame 1, suction tude 2, outlet pipe 3, intervalve 4, exhaust cavity 5, intermediate cavity 6, air-inlet cavity 7, first dividing plate 8, second partition 9, pipeline dividing plate 10, resonant cavity 11, resonance trunnion 12, the 3rd dividing plate 13.

Embodiment

Below in conjunction with accompanying drawing, specific embodiments is described.

As shown in Fig. 2 Fig. 3 Fig. 4, silencing apparatus comprises the cylindrical case body 1 of closed at both ends, suction tude 2, outlet pipe 3 and intervalve 4, dividing plate is set in the inner chamber of frame 1 and includes the first dividing plate 8, second partition 9, 3rd dividing plate 13, first dividing plate 8 outside housing cavity low order end formed resonant cavity 11, cavity between the first dividing plate 8 and second partition 9 forms air-inlet cavity 7, cavity between second partition 9 and the 3rd dividing plate 13 forms intermediate cavity 6, 3rd dividing plate 13 outside the high order end of housing cavity cavity formed exhaust cavity 5, on the first dividing plate 8, be wherein provided with resonance trunnion 12 air-inlet cavity 7 is communicated with resonant cavity 11, in intermediate cavity 6, be filled with sound-absorbing material such as to absorb sound sponge etc., intervalve 4 passes through the 3rd dividing plate 13, intermediate cavity 6, second partition 9, and its one end is positioned at exhaust cavity 5, and the other end is positioned at air-inlet cavity 7, is communicated with by exhaust cavity 5 with air-inlet cavity 7, suction tude 2 is 90 ° of bending tubes, and wherein one section is passed the outside of side to frame of frame 1 from air-inlet cavity 7, and another section is successively through second partition 9, intermediate cavity 6, the 3rd dividing plate 13 to exhaust cavity 5, outlet pipe 3 is also 90 ° of bending tubes, wherein one section is passed the outside of side to frame of frame 1 from exhaust cavity 5, another section is successively through the 3rd dividing plate 13, intermediate cavity 6, second partition 9 to air-inlet cavity 7, portion's section that suction tude 2, intervalve 4, outlet pipe 3 are positioned at intermediate cavity 6 is provided with vent, and suction tude 2, intervalve 4, outlet pipe 3 are communicated with intermediate cavity 6 by respective vent.Portion's segment pipe that suction tude 2, intervalve 4, outlet pipe 3 are positioned at intermediate cavity 6 is parallel to each other, and portion's segment pipe distance between any two that suction tude 2, intervalve 4, outlet pipe 3 are positioned at intermediate cavity is equal, portion's segment pipe that also namely suction tude, intervalve, outlet pipe are positioned at intermediate cavity is arranged by the summit of equilateral triangle.The tail gas of motor enters through the entrance of suction tude, air-inlet cavity, intermediate cavity is passed through successively in exhaust cavity by suction tude, and then again flow through intermediate cavity to air-inlet cavity through intervalve, afterwards to enter outlet pipe outside to frame by intermediate cavity, exhaust cavity successively.

Claims (10)

1. a silencing apparatus, comprise frame, suction tude, outlet pipe, characterized by further comprising intervalve, in the inner chamber of frame, dividing plate is set, described frame inner chamber is separated into intermediate cavity and is positioned at the air-inlet cavity of intermediate cavity both sides by described dividing plate, exhaust cavity, described intermediate cavity is filled with sound-absorbing material, described suction tude is the bending tube with horizontal segment and vertical section, its vertical section passes the outside of side to frame of frame from air-inlet cavity, exhaust cavity is communicated with the suction tude suction port being positioned at frame outside to exhaust cavity through intermediate cavity from air-inlet cavity by horizontal segment, exhaust cavity is communicated with air-inlet cavity to air-inlet cavity through intermediate cavity from exhaust cavity by described intervalve, described outlet pipe is the bending tube with horizontal segment and vertical section, its vertical section passes the outside of side to frame of frame from exhaust cavity, air-inlet cavity is communicated with the outlet pipe air outlet being positioned at frame outside to air-inlet cavity through intermediate cavity from exhaust cavity by horizontal segment, described suction tude, intervalve, portion's section that outlet pipe is positioned at intermediate cavity is provided with vent by suction tude, intervalve, outlet pipe is communicated with intermediate cavity.

2. silencing apparatus according to claim 1, is characterized in that the horizontal segment of described suction tude, intervalve, outlet pipe horizontal segment are parallel to each other.

3. silencing apparatus according to claim 2, is characterized in that the horizontal segment three distance between any two of the horizontal segment of described suction tude, intervalve, outlet pipe is equal.

4. silencing apparatus according to claim 1, is characterized in that the horizontal segment of described suction tude and vertical section are mutually vertical.

5. silencing apparatus according to claim 1, is characterized in that the horizontal segment of described outlet pipe and vertical section are mutually vertical.

6. silencing apparatus according to any one of claim 1 to 5, it is characterized in that also dividing during described dividing plate is in frame being separated with resonant cavity, one of them chamber in the chamber adjacent with described resonant cavity is communicated with described resonant cavity by the trunnion that resonates.

7. silencing apparatus according to claim 6, is characterized in that described resonant cavity is positioned at the right side of described air-inlet cavity adjacent with air-inlet cavity, and described resonant cavity is communicated with air-inlet cavity through resonance trunnion.

8. silencing apparatus according to claim 6, is characterized in that described resonant cavity is positioned at the left side of described exhaust cavity adjacent with exhaust cavity, and described resonant cavity is communicated with exhaust cavity through resonance trunnion.

9. silencing apparatus according to claim 6, it is characterized in that described resonant cavity is arranged in the side of the described intermediate cavity left and right sides, the horizontal segment of described suction tude, the horizontal segment of outlet pipe, intervalve from air-inlet cavity through described intermediate cavity and resonant cavity to exhaust cavity.

10. the silencing apparatus according to any one of claim 7 to 9, is characterized in that described resonance trunnion quantity is one or more.