CN2045537U

CN2045537U - Airflow counteracting muffler

Info

Publication number: CN2045537U
Application number: CN 88208759
Authority: CN
Inventors: 浦晓亨
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-07-28
Filing date: 1988-07-28
Publication date: 1989-10-04

Abstract

The utility model discloses an airflow counteracting muffler belonging to a device utilizing structural design to generate opposite currents of airflow, which are counteracted by each other, so as to obtain the result of muffling. The interior of the muffler is provided with more than two hollow cones each of which is provided with rows of small holes arranged at the symmetrical points of the shaft of the cone. When noise airflow flows from the head of the cones to the symmetrical rows of small holes, multiple currents of airflow, which are counteracted by each other, are formed. As a result, the goal of reducing noise is achieved.

Description

Airflow counteracting muffler

The utility model is to utilize structural design to produce the quieter of phase counterblast.

Existing exhaust box is principle manufacturings such as the absorption, reflection, interference according to sound, to reduce the noise of sound source radiation.The artificial sound source of overseas utilization produces the purpose that reaches offset noise with the sound of noise source antiphase recently.After Jap.P. JF58-214613 proposition detects engine exhaust air pressure by electronic installation, make a sound press again and offset exhaust noise with exhaust pulsation sound antiphase.Its weak point is a complex structure, and cost is higher.

The purpose of this utility model is that the air-flow that utilizes the structural design generation of exhaust box multiply itself to cancel out each other reaches noise reduction.

The utility model is achieved in that according to opposite, the equipollent noise air-flow of both direction and bumps against, can reduce noise intensity principle design novel exhaust box.Its structure is: exhaust box has a garden pipe, wherein has one section outside that one garden tube is arranged, and their axis is concentric.In pipe inside, garden the hollow cone that (comprises two) more than two is set, the cone head is towards airintake direction, and cone angle is less than 90 °.On the symmetric points of axis of symmetry, be drilled with the aperture of several rows of aperture at cone greater than 2mm.Also be drilled with the aperture of several rows of aperture greater than 2mm on the garden tube wall around the first segment cone, these apertures communicate with the garden tube.The sealing of garden tube front end, rear end cap is communicated with the external world by Da Yuan hole one by one.The reflection by cone before the first segment cone of part air-flow is led to the garden tube by the aperture on the tube wall of garden, discharges from a plurality of Da Yuan hole of garden tube rear end lid after disturbing, mixing.Another part air-flow enters in the cone from the aperture on the cone wall, is to be in symmetric position by thereon aperture, and this multiply air flow direction is opposite, equal and opposite in direction, plays the effect of cancelling each other.Then enter into the second joint cone, noise is further weakened, by that analogy, and outside the last vent pipe of this part air-flow.

This utility model is compared with the method that noise offsets with the existing artificial sound source of electronic technology manufacturing of utilizing, and does not need additionally to increase attachment device, so have low, the characteristic of simple structure of cost.

The concrete structure of utility model is provided by drawings and Examples: figure one is the air-flow formula exhaust box profile synoptic diagram that contends with, and the arrow direction is the air motion direction among the figure.Figure two is the right view of exhaust box for this reason.This exhaust box is mainly by garden pipe (1), and cone (2), (3) and garden tube (4) are formed.After the air-flow that engine is discharged entered into garden pipe (1), air-flow was in the preceding repeatedly reflection counteracting portion of energy of leaning on cone and tube wall of first segment cone (2), and wherein a part enters (directly or by cone reflecting) garden tube by the aperture (5) of 2.5mm.Air-flow disturbs, mixes the back and discharges from hole, garden (6) at garden tube internal diameter.It is in 45 ° the cone that part air-flow enters into cone angle through 2.5mm aperture (7).By thereon aperture is to be in symmetric position, and air-flow is divided into multiple flow and weakens mutually to opposite, equal-sized air-flow.Then the aperture (8) by 2.5mm enters into the second joint cone (3), and its cone angle also is 45 °.Noise is further weakened outside the vent pipe of back.

Claims

1, a kind of air-flow formula exhaust box that contends with, structurally produce the air-flow of cancelling each other and reach the noise reduction purpose, it is characterized in that: a garden pipe is arranged, the hollow cone that (comprises two) more than two is arranged in pipe, cone head is drilled with corresponding several rows of aperture on each cone surface with the symmetric position of its axis of symmetry towards airintake direction.

2,, it is characterized in that the cone cone angle is less than 90 ° according to the described exhaust box of claim 1.

3,, it is characterized in that aperture on the cone is greater than 2mm according to the described exhaust box of claim 1.

4, according to the described exhaust box of claim 1, it is characterized in that outside the pipe of garden, one section garden tube being arranged, there is several rows of aperture to communicate on the garden tube wall of first segment cone periphery with the garden tube.

5, according to the aperture on the tube wall of the described garden of claim 4, it is characterized in that the aperture is greater than 2mm.

6, according to the garden tube of the described garden of claim 4 tube wall exterior, it is characterized in that the front end sealing, the rear end perforate communicates with atmosphere.

7,, it is characterized in that with the garden pipe coaxial according to the described garden of claim 4 tube.