CN2929629Y

CN2929629Y - Silencer with Lafal tube

Info

Publication number: CN2929629Y
Application number: CNU2006201243073U
Authority: CN
Inventors: 杨景暄; 李强
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-07-06
Filing date: 2006-07-06
Publication date: 2007-08-01
Anticipated expiration: 2016-07-06

Abstract

The utility model relates to a silencer with a convergent-divergent channel comprises a first silencing room and a second silencing room separated with each other, wherein the inlet port of the convergent-divergent channel is equipped on the bottom of the first silencing room, the outlet port passes a separating plate between the first silencing room and the second silencing room and extended to the bottom of the second silencing room, the middle of the second silencing room is equipped with a cyclone, a side wall of the upper portion is equipped with uniformly distributed via holes, air flow passes the via holes to the atmosphere, inner plate of the shell body adopts mini hole plates, an acoustic material layer is equipped between the inner plate and the outer plate used to absorb noise. The utility model can effectively decrease noise produced noise during air exhaustion, whose acoustic effect is obviously better than the prior acoustic device which only adopts a holed plate to silence noise, mainly can be used for the silencing during large quantity exhaustion of pressure gas and other similar situation.

Description

The muffler of band la farr pipe

Technical field

The utility model relates to a kind of muffler with la farr pipe, the noise reduction when mainly can be used for the discharging of atm number compressed gas.

Background technology

Compressed gas under pressure vessel or other occasions because gas sharply expands and violent turbulent flow, tends to produce very strong noise during discharging, special noise reduction tapping equipment or muffler need be set carry out noise reduction, to reduce noise emissions.This class noise reduction tapping equipment or muffler adopt the orifice plate draining technology more under the prior art, compressed gas passes through preliminary expansion step-down in noise reduction tapping equipment or muffler after, the through hole that passes on the orifice plate enters atmosphere, because effects such as the damping of through hole and sound absorption, can reduce noise to a certain extent, but for the discharging of the bigger gas of pressure ratio or in the strict zone of noise restriction ratio, this erasure effect still is not enough, therefore need the further new muffler of exploitation.

Summary of the invention

For overcoming the above-mentioned defective of prior art, the utility model provides a kind of muffler with la farr pipe, so that better erasure effect to be provided.

The present invention realizes that the technical scheme of above-mentioned purpose is: a kind of muffler with la farr pipe, the anechoic chamber and the secondary anechoic chamber that comprise mutual separation, be provided with la farr pipe in the described anechoic chamber, the import of described la farr pipe is communicated with a described anechoic chamber, and outlet is communicated with described secondary anechoic chamber.

The invention has the beneficial effects as follows: because the utility model is provided with two anechoic chambers at least, carry out repeatedly noise reduction, particularly in an anechoic chamber, be provided with la farr pipe with very strong sound deadening, when flowing to the secondary anechoic chamber by an anechoic chamber, gas must pass through the la farr pipe noise reduction, reduced noise thus effectively, its erasure effect obviously is better than only adopting the existing silencing means of orifice plate noise reduction.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the main TV structure schematic diagram of the utility model cyclone;

Fig. 3 is the side-looking structural representation of the utility model cyclone.

The specific embodiment

Referring to Fig. 1, the utility model provides a kind of muffler with la farr pipe, and anechoic chamber 2 and secondary anechoic chamber 5 that it comprises mutual separation are provided with la farr pipe 3 in the described anechoic chamber, the import of described la farr pipe is communicated with a described anechoic chamber, and outlet is communicated with described secondary anechoic chamber.

A described anechoic chamber and secondary anechoic chamber can adopt same housing, be provided with central dividing plate 4 in the described housing, with space segmentation in the housing is a described anechoic chamber and secondary anechoic chamber, space below the dividing plate is a described anechoic chamber, and the space above the dividing plate is described secondary anechoic chamber.

Described housing can be cylindrical, and the harmony when helping gas like this flowing in space (comprise an anechoic chamber and secondary anechoic chamber) in housing helps reducing turbulent flow and noise.

Described la farr pipe is positioned at the columniform central authorities of described housing from horizontal direction, the axial line of la farr pipe (rotation line of symmetry, down together) with described housing axle center line overlap, this setup equally also is the harmony that helps air-flow, reduces turbulent flow and noise.

The lower end of described la farr pipe is an entrance point, is positioned at the bottom of a described anechoic chamber, and described dividing plate is passed in the upper end, extends to the bottom of described secondary anechoic chamber.Muffler blast pipe 1 is installed in the top of described anechoic chamber's sidewall, after air-flow enters anechoic chamber through blast pipe, volumetric expansion, kinetic energy reduces, flow downward with space between the described housing along described la farr pipe after expanding, arrive upwards counter-rotating behind the bottom, an anechoic chamber, import by described la farr pipe flows into described la farr pipe, and according to the variation of la farr pipe internal diameter, improve earlier flow velocity gradually, reduce flow velocity more rapidly, finally the outlet through described la farr pipe enters described secondary anechoic chamber.In the flow process in anechoic chamber, the energy of gas is consumed, and noise is absorbed by the wall of housing and isolates, and particularly because the strong sound insulation and the sound deadening of la farr pipe, the gas noise that enters the secondary anechoic chamber has reduced a lot.

Middle part, described secondary anechoic chamber is provided with cyclone 6, described cyclone is divided into upper and lower two parts with the secondary anechoic chamber, the middle part of cyclone is provided with the deflection cone 10 to lower convexity, periphery is evenly distributed with some guide vanes 9, described guide vane is skewed, and when gas was flowed through cyclone, the air-flow that is positioned at the housing central part was around flowing to reposefully under the guiding of described deflection cone, gas all around is rotation rising equably under the guiding of guide vane, enters the top of secondary anechoic chamber.Under this diversion mode, the air-flow uniform and stable, the turbulent flow of generation and concussion are little, and noise is low.

The upper portion side wall of described secondary anechoic chamber is provided with some through holes 7, and described through hole evenly distributes usually.Gas flows out muffler through these through holes, enters atmospheric environment.Described through hole can produce good damping and noise reduction effect to air-flow, helps further reducing the discharging of noise.

The wall of described housing can be provided with lamina rara externa, and described lamina rara externa inboard is provided with sound-absorbing material layer 8, and described layers of absorbent material inboard can be provided with inner plating, and described inner plating can adopt microwell plate.By the sound absorption of micropore and sound-absorbing material, can reduce the gas noise in the housing, strengthen the erasure effect of muffler.Because the air velocity in contiguous case top and bottom is very low,, make sound-absorbing material layer directly be exposed at the interior inner surface of housing so can not establish inner plating at the top and/or the end of housing.Help simplifying production technology like this, save material, reduce production costs.

Described sound-absorbing material layer can be made by materials such as rock wool, sponges, and described inner plating and lamina rara externa can adopt sheet metal.

Described muffler blast pipe can be the truncated cone-shaped that ecto-entad is expanded gradually, and air velocity is gradually changed, the noise that produces when avoiding rapid speed change.The outer end of described blast pipe can be provided with flange, so that connect with gas pipeline or container.

Claims

1. muffler with la farr pipe, it is characterized in that comprising the anechoic chamber and the secondary anechoic chamber of mutual separation, be provided with la farr pipe in the described anechoic chamber, the import of described la farr pipe is communicated with a described anechoic chamber, and outlet is communicated with described secondary anechoic chamber.

2. the muffler of band la farr pipe as claimed in claim 1, it is characterized in that a described anechoic chamber and secondary anechoic chamber adopt same housing, be provided with central dividing plate in the described housing, the space below the dividing plate is a described anechoic chamber, and the space above the dividing plate is described secondary anechoic chamber.

3. the muffler of band la farr pipe as claimed in claim 2 is characterized in that described housing is cylindrical, and described la farr pipe is positioned at the columniform central authorities of described housing from horizontal direction, and its axial line is overlapping with the axial line of described housing.

4. the muffler of band la farr pipe as claimed in claim 1, the lower end that it is characterized in that described la farr pipe is an entrance point, be positioned at the bottom of a described anechoic chamber, described dividing plate is passed in the upper end, extend to the bottom of described secondary anechoic chamber, the blast pipe of muffler is installed in the top of described anechoic chamber's sidewall.

5. as the muffler of claim 1,2,3 or 4 described band la farr pipes, it is characterized in that middle part, described secondary anechoic chamber is provided with cyclone, described cyclone is divided into upper and lower two parts with the secondary anechoic chamber, the middle part of cyclone is provided with the deflection cone to lower convexity, periphery is evenly distributed with some guide vanes, and described guide vane is skewed.

6. the muffler of band la farr pipe as claimed in claim 5 is characterized in that the upper portion side wall of described secondary anechoic chamber is provided with some through holes, and described through hole evenly distributes.

7. the muffler of band la farr pipe as claimed in claim 5 is characterized in that the wall of described housing is provided with lamina rara externa, and described lamina rara externa inboard is provided with sound-absorbing material layer.

8. the muffler of band la farr pipe as claimed in claim 7 is characterized in that the part or all of inboard of described layers of absorbent material is provided with inner plating, and described inner plating adopts microwell plate.

9. the muffler of band la farr pipe as claimed in claim 9 is characterized in that described sound-absorbing material layer made by rock wool or sponge material, and described inner plating and lamina rara externa can adopt sheet metal.

10. the muffler of band la farr pipe as claimed in claim 9 is characterized in that its blast pipe is the truncated cone-shaped that ecto-entad is expanded gradually, and its outer end is provided with flange.