CN219040061U

CN219040061U - Impedance composite muffler

Info

Publication number: CN219040061U
Application number: CN202223052035.9U
Authority: CN
Inventors: 赵艳峰; 谭洪军; 朱波; 倪龙涛; 孙霞阳
Original assignee: Chongqing Zongshen General Power Machine Co Ltd
Current assignee: Chongqing Zongshen General Power Machine Co Ltd
Priority date: 2022-11-17
Filing date: 2022-11-17
Publication date: 2023-05-16
Anticipated expiration: 2032-11-17

Abstract

The utility model relates to a muffler and discloses an impedance composite muffler, which comprises a shell provided with a silencing cavity, wherein a silencing structure containing silencing cotton is arranged in the shell; wherein: the silencing cotton structure comprises a first partition plate, a second partition plate and a silencing cotton assembly, wherein the silencing cavity is divided into three cavities, the silencing cotton assembly comprises a pressing plate and silencing cotton clamped between the two pressing plates, and two ends of the silencing assembly are respectively connected with the first partition plate and the second partition plate. In the impedance composite muffler, the silencing cotton assembly is formed by matching the pressing plate and the silencing cotton, so that the installation is simpler.

Description

Impedance composite muffler

Technical Field

The utility model relates to a muffler, in particular to an impedance composite muffler.

Background

The silencer is used for reducing noise generated when an engine of a motor vehicle works, and because the length difference of the two pipelines is equal to half of the wavelength of sound waves emitted by the motor vehicle, the two rows of sound waves interfere and cancel each other when being overlapped to weaken sound intensity, so that the sound is reduced, and the silencing effect is achieved. The exhaust noise belongs to broadband noise, and low, medium and high frequencies are required to have certain noise elimination amount to meet the requirement of noise reduction. The resistive muffler has better sound damping performance at medium and low frequencies, the sound damping cotton only acts on high frequencies, and the impedance composite muffler with the sound damping cotton is more and more popular in application.

The Chinese patent document CN106050750B discloses a large-air-volume sheet type impedance composite muffler, which comprises a shell, wherein the shell comprises a ventilation cavity, a side muffler sheet is fixedly arranged on the inner wall of the shell, fiber cloth is arranged between the side muffler sheet and the shell, the fiber cloth is fully paved on the inner wall of the shell, and the fiber cloth is adhered with the shell; at least two silencing plates are arranged in the ventilation cavity of the shell, the silencing plates are arranged at left and right intervals along the air flow direction of the ventilation cavity, the silencing plates incline relative to the side wall of the shell, the interval distances between the silencing plates are unequal, and the inclination angles of the silencing plates relative to the shell are inconsistent; the sound attenuation board includes two perforated plates that set up relatively, is provided with the through-hole on the perforated plate, has fully spread sound absorption glass cotton between two perforated plates that set up relatively, and two perforated plates are fixed with sound absorption glass cotton bonding, and two equal fixed joint of perforated plates are on the casing. The muffler not only can effectively avoid noise leakage, but also can separate and eliminate noise with different frequency bandwidths.

This prior art has the following disadvantages: because the sound-absorbing glass wool in the prior art is adhered and fixed on the perforated plate, in order to ensure a good silencing effect, the sound-absorbing glass wool needs to be accurately and perfectly adhered on the perforated plate during adhesion, so that the sound-absorbing glass wool is inconvenient to install.

Disclosure of Invention

The utility model provides an impedance composite muffler for solving the technical problem that sound-absorbing cotton is inconvenient to install in the prior art, which comprises a shell provided with a sound-absorbing cavity, wherein a sound-absorbing structure containing sound-absorbing cotton is arranged in the shell; wherein: the silencing structure comprises a first partition plate, a second partition plate and a silencing assembly, wherein the first partition plate and the second partition plate divide a silencing cavity into three chambers, the silencing assembly comprises a pressing plate and silencing cotton clamped between the two pressing plates, and two ends of the silencing assembly are respectively connected with the first partition plate and the second partition plate.

Preferably, the end edge of the first baffle is provided with a U-shaped flanging, the notch of the U-shaped flanging is arranged towards the second baffle, and one end of the silencing assembly is clamped in the notch.

Preferably, the end edge of the second partition plate is provided with a flanging with a drawing angle, and the second partition plate is in interference fit with the shell.

Preferably, the draft angle is 10-15 °.

Preferably, the pressing plate positioned on the outer side of the silencing assembly is welded and fixed with the first partition plate and the second partition plate.

The utility model has the following beneficial effects:

1. in the scheme, the silencing component is formed by matching the pressing plate and the silencing cotton, and compared with the bonding mode in the prior art, the silencing component is simpler to install;

2. in this scheme, the direction when setting up easy to assemble of the U type turn-ups of first baffle, the draft angle that the second baffle was had can reduce the gap between second baffle and the casing to can guarantee the seal in amortization chamber, just also can guarantee the amortization effect.

Drawings

FIG. 1 is a schematic diagram of an embodiment of an impedance composite muffler according to the present utility model;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

fig. 3 is a partial enlarged view of the sound deadening structure of fig. 2.

Detailed Description

The following is a further detailed description of the embodiments:

1. definition of the definition

Drawing die angle: the included angle between the tangential direction of the side surface of the workpiece, which is intersected with the parting surface of the die, and the normal direction of the parting surface of the die is artificially set for better detachment (pulling-out) of the workpiece from the die.

Flanging: refers to a blank with straight walls or flanges formed with angles along the edges of closed or non-closed curves by the action of a die on the planar or curved portions of the blank.

2. Reference numerals in the drawings of the specification include: the device comprises a shell 1, a first partition plate 2, a second partition plate 3, a first pressing plate 4, a second pressing plate 5 and silencing cotton 6.

An embodiment is substantially as shown in figures 1, 2 and 3 of the accompanying drawings: an impedance composite muffler comprises a shell 1 provided with a sound-deadening cavity, and a sound-deadening structure containing sound-deadening cotton 6 is arranged in the shell 1.

Specifically, the silencing structure comprises a first baffle plate 2, a second baffle plate 3 and a silencing assembly, wherein the silencing cavity is divided into three chambers, and two ends of the silencing assembly are respectively connected with the first baffle plate 2 and the second baffle plate 3.

The end of the first baffle plate 2 is provided with a U-shaped flanging, and the end of the second baffle plate 3 is provided with a flanging with a draft angle of 10-15 degrees and is in interference fit with the shell 1.

The silencing assembly comprises a first pressing plate 4, a second pressing plate 5 and silencing cotton 6 clamped between the two pressing plates, wherein the silencing cotton 6 is wound on the outer side of the first pressing plate 4, the second pressing plate 5 is placed on the outer side of the silencing cotton 6 to form the silencing assembly, and two ends of the second pressing plate 5 are welded and fixed with the first partition plate 2 and the second partition plate 3 to form a silencing structure.

The foregoing is merely an embodiment of the present utility model, and a specific structure and characteristics of common knowledge in the art, which are well known in the scheme, are not described herein, so that a person of ordinary skill in the art knows all the prior art in the application day or before the priority date of the present utility model, and can know all the prior art in the field, and have the capability of applying the conventional experimental means before the date, so that a person of ordinary skill in the art can complete and implement the present embodiment in combination with his own capability in the light of the present application, and some typical known structures or known methods should not be an obstacle for a person of ordinary skill in the art to implement the present application. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present utility model, and these should also be considered as the scope of the present utility model, which does not affect the effect of the implementation of the present utility model and the utility of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.

Claims

1. An impedance composite muffler comprises a shell provided with a sound-deadening cavity, wherein a sound-deadening structure containing sound-deadening cotton is arranged in the shell; the method is characterized in that: the silencing structure comprises a first partition plate, a second partition plate and a silencing assembly, wherein the first partition plate and the second partition plate divide the silencing cavity into three chambers, the silencing assembly comprises a pressing plate and silencing cotton clamped between the pressing plates, and two ends of the silencing assembly are respectively connected with the first partition plate and the second partition plate.

2. The impedance composite muffler of claim 1, wherein: the end edge of the first partition board is provided with a U-shaped flanging, the notch of the U-shaped flanging faces the second partition board, and one end of the silencing component is clamped in the notch.

3. The impedance composite muffler of claim 2, wherein: the end edge of the second partition plate is provided with a flanging with a drawing angle, and the second partition plate is in interference fit with the shell.

4. The impedance composite muffler of claim 3, wherein: the draft angle is 10-15 degrees.

5. The impedance composite muffler of claim 4, wherein: and the pressing plate positioned on the outer side of the silencing assembly is fixedly welded with the first partition plate and the second partition plate.