JPS58197412A - Muffler - Google Patents

Abstract

PURPOSE:To enhance the effect of noise suppression and as well to reduce pressure loss of air stream, by using such an arrangement that a flow passage pipe comprising a noise suppressing chamber and a sonic wave permeable material is connected with a plurality of sheet-like elements arrayed in the flow passage pipe axially thereof. CONSTITUTION:Fluid medium directing from a connecting pipe 4 to a flow passage pipe 4, including noises, maintains its swirl flow, without fierce turbulent air stream being resulted, even while the straight forward motion of the medium is hindered by twisted plates 7, and therefore, passes through a plurality of flow channels defined by the flow passage pipe 1 and the twisted plates 7 without any appreciable pressure drops being brought about. This air stream comes to the rear end of the flow passage pipe 1, and then is discharged into another connecting pipe 4. Noises in a whole sonic range within the air stream is inhibited to move straight-forward by means of the twisted plates 7, then is directed toward the flow passage pipe 1, and further, easily permeates through the flow passage pipe 1 made of sonic wave permeable material, thereby noise is suppressed in a sound absorbing chamber, a resonance chamber, an expansion chamber, etc., which are arranged outside of the flow passage pipe 1.

Description

[Detailed Description of the Invention] A twisted plate for creating a swirling flow of fluid over the entire axial length of a flow pipe in contact with a silencer equipped with various sound damping functions such as sound absorption, resonance, and expansion, and for blocking straight forward movement of sound waves. , or a silencer made of a plurality of sort-like elements such as flat plates connected, continuous, or discontinuously arranged.

A number of m* products are already known as silencing chambers for air ducts and silencing mufflers for internal combustion engine exhaust pipes. These are obtained by combining three principle mufflers: the sound absorbing muffler shown in Fig. 2, the resonant muffler shown in Fig. 2, and the expansion muffler shown in Fig. 3.

In the first place, in general mufflers, there is a trade-off relationship between the muffling effect and the pressure loss number, and it is said to be technically difficult to add KpI for both at the same time.

(Conventional mufflers improve the muffling effect by intermittent or bent pipes in the km of flow pipes adjacent to the muffler chamber, but the reality is that the pressure loss of the airflow increases significantly.) be.

Therefore, a muffler that is satisfactory in terms of both muffling effect and pressure loss reduction has not been obtained. In particular, from the standpoint of energy conservation, there is a strong need to save and reduce the power consumption of air conditioners and the energy loss of internal combustion engines due to the pressure resistance of sound damping chambers and mufflers. In this sense, there is a need for a new muffler that can significantly suppress pressure loss without reducing the muffling effect.
Ru.

Compensating for the shortcomings of conventional silencers, it is an energy-saving product for the times.
The present invention is a response to the II situation.

Next, the contents of the present invention will be explained in detail based on the drawings. Figures 4 and 5 show a conventional silencer consisting of a sound absorption chamber (B) and a tubular channel; Figure 7 shows a conventional muffler consisting of a sound absorption and resonance chamber or a sound absorption and expansion chamber (q) and a tubular channel; and a tubular channel (4). Each of the above-mentioned conventional silencers constitutes a main part of the structure of the present invention, and the tubular flow path (4) of each of these silencers has various sheet shapes as shown in FIGS. !
A silencer according to the present invention is obtained by installing a plurality of cables or a single cable.

The configurations of each of the above types of conventional silencers will be described in more detail.

4 and 5 consist of a tubular flow channel and a sound absorption chamber (B), and are intended to absorb and muffle noise within the fluid. The tubular flow path (4) is connected to the flow path pipe (1) over the entire length of the silencer.
1. The channel pipe (1) is made of a sound-transmitting material such as a wire mesh, a felt-like fiber material, a woven fiber material, a porous material, a perforated plate, a perforated plate lined with a thin film material, or the like.

The sound absorption 'M fB) is formed by the flow path pipe +11, the jacket pipe (2), and the flange plate (3), and its chamber is filled with various sound absorbing materials (5) such as glass wool, or is lined with It is normal that the

The silencer shown in Figs. 6 and 7 consists of a tubular flow path (4) and a sound absorption/resonance chamber or a sound absorption/expansion chamber (+C), and is intended for absorption and resonance damping of sound within the fluid, or expansion sound damping. It is something to do.

The tubular flow path (4) is formed by a flow path pipe fil that is continuous over the entire length of the silencer. The flow pipe (1) has a fourth
It is made of the same sound-transparent material as the channel pipe (1) in FIG. 5.

The sound absorption/resonance chamber or the sound absorption/expansion chamber (C) is the flow path pipe +11
, envelope tube (2), flange plate (3), bulkhead (6)
The chamber is lined with a sound absorbing material (5) such as glass wool.

The silencer shown in Figures 8 and 9 consists of a tubular flow channel and a sound absorption/resonance chamber (
9) and expansion chamber (9) are aimed at silencing various types of noise within the fluid due to absorption, resonance, and expansion.

The tubular flow path is a flow path pipe (1
) formed by 70 The same sound-transmitting material as the flow path pipe (1) in FIGS. 4 and 5 is used for the material of the flow path pipe (1).

The sound absorption and resonance chamber (6) includes a flow pipe (1), a jacket pipe (2),
It consists of a flange plate (3) and a partition wall (6), and its interior is lined with a sound absorbing material (5).

The expansion chamber (G) consists of a flow path pipe (1), a jacket pipe (2), a seven-lung plate (3), and a partition wall (6), and the interior thereof is basically kept hollow.

Flow pipe (1) of each of the above types of silencer (Figures 4 to 9)
Inside the axial direction, a number of sheet-like elements such as each twisted plate (7) shown in Figs. 10 to 17 or the flat plate 00 shown in Figs. 22 and 23 are interconnected or a predetermined The basic structure of the present invention' is to provide them at intervals or intermittently.

Besides that, Kll! The threaded plates (8) and (9) shown in Figures 18 to 21, which are integrally molded with the flow pipe, are placed inside the flow pipe +11 of each type of silencer (Figs. 4 to 9). The silencer of the present invention can be obtained by arranging K continuously or intermittently, or by replacing part or all of the flow pipe (1).

Flow pipe (1) which is one of the main components of the silencer of the present invention
The cross-sectional shape of is not limited to a circle, but all shapes such as an ellipse, a square, a hexagon, a rectangular shape, and an amorphous shape are valid.

As an embodiment of the present invention, the main parts of the structure of the muffler include a tubular channel (4) for providing a sheet-like element and a muffler chamber (B, C, D, E) adjacent thereto. As shown in Figures 4 and 5, Figures 6 and 7, and Figures 8 and 9,
The invention is not limited to these examples. In the case of a silencer with a tubular flow path, the function, structure, dimensions, material, and positional relationship between the flow path and the muffling chamber are completely different.
However, it is effective for the present invention.

Examples of sheet-like llI cables such as various twisted plates (7), (81, (91), flat plate parts, etc.) are shown in FIGS. 10 to 23, and will be explained in order.

In FIGS. 10 and 11, the torsion plate (7) having a twist angle in one direction is assumed to be sheet-like 1jI'X, and these l! This is a structure in which the layers are connected to each other within the plane.

In FIGS. 12 and 13, two kinds of twisted plates (7) having mutually opposite twist angles are used as sheet elements, and these two kinds of elements are alternately connected in a plane.

Figures 14 and 15 show sheet-like elements of a torsion plate (7) with a unidirectional twist angle interconnected so as to intersect out of plane.

Figures 16 and 17 show that a twisted plate (7) for fitting into a channel pipe (11) with a rectangular cross section is used as a sheet-like element, and the sheet-like elements with a twist angle in one direction are mutually in-plane. It is connected by .

Figures 18 and 19 show a structure in which a torsion plate with a twist angle in one direction and a channel pipe are integrally molded or brought into close contact with each other, and the elements (8) are interconnected in the axial direction. I,
-It is something. Note that the portion corresponding to the channel tube of element II' (8) is made of a sound-transparent material such as a punching plate or a porous material.

In Figures 20 and 21, the element (9) is a pair of flow pipes with a semicircular cross section twisted in the axial direction, and its main g
+9+ are interconnected in the axial direction.

So~ej no 1! At least the outer peripheral portion of element (9) corresponding to the flow path pipe is made of the same material as the portion corresponding to the flow path pipe of element (8) in FIGS. 18 and 19.

Figures 22 and 23 show that a unit tatami rope member is a pair of semi-elliptical flat plates that are in point contact outside the plane, and that they are connected in the axial direction of a flow pipe (11). ).

The above twisted plate (7), (8), (9) or the flat plate (IQ
Materials include regular plates, porous plates,
Various types of plates such as perforated plates, mesh plates, and woven plates are applicable.

In addition, the shapes of the twisted plates (7), (8), and (9) and the flat plate portions are different from the various sheet-like elements shown in FIGS. ! The element is integrally molded into a single continuous sheet-like element, and the different types of sheets shown in the diagram! +1 mutually, those in which the twist angle or twist direction of the illustrated unit sheet-like elements are changed, those in which the curved surface of the illustrated sheet-like element is converted into a folded surface, etc. The cross-sectional shape of the twisted plate (7) inside the flow path pipe +11 shown in the figure6. Z transformed into ♀, ÷, *・, ×, ■], etc., and cross-sectional shapes of twisted plates (8) and (9) integrally molded with flow pipes■,■
There are variations of [F], ■, ■, ■, ←shi, etc., and all of these are effective for the present invention. In addition to this, there are also sheets to prevent sound from traveling straight and to prevent turbulence in the airflow.
! Various shapes of the element can be easily conceived, and all are effective in the present invention.

The method of arranging the twisted plates (71, (8), (9) and flat plate portions in the flow path pipe) includes sheet-like elements (7), (8), (9), α・In the same way, sheet-like elements are arranged at predetermined intervals from each other, and sort-like, which are connected or continuous!! , similarly, there are those in which sheet-like elements are arranged intermittently, and there are also those in which sheet-like elements are arranged and arranged only at specific locations within the flow path pipe, all of which are effective for the present invention.

Channel pipe fil K predetermined sheet-like elements (7), (8),
(9) The silencer of the present invention, which is formed by arranging the wires, has the following effect on the flowing fluid (mainly airflow) containing noise flowing from the connecting pipe (41) to the flow path pipe (11).

First, the airflow itself consists of twisted plates (7), (8), (9),
In order to maintain a friendly flow that does not cause turbulence in the air flow even though the straight movement is blocked by the action of the flat plate O1, the flow path 91 (11) and twisted plates (7), (8 ), (9), moves through a plurality of flow channels made up of flat plates a1.The airflow finally reaches the end of the flow pipe (11) and flows out of the other connecting pipe (4)K.

All-range noise in the airflow is generated by twisted plates (7), (8), (
9), flat plate (I was prevented from going straight due to the function of IQ,
Namely, twisted plates (7), (8), (9), flat plates (IQ
The noise that has been reflected on the surface of the channel (1) is directed toward the flow pipe (1), and further easily passes through the flow pipe +11 made of a sound-transmitting material. It is muted in chambers, resonance wealth, expansion vines, etc.

Most of the noise is muffled when the airflow containing noise passes through a plurality of flow channels in the flow pipe (1). As a result, a low-noise airflow flows from the end of the flow pipe (1) to the connecting pipe (4) without any significant pressure drop.

A typical muffler of the present invention equipped with the flow path pipe ftl K shown in Figs. 4 and 5 and the twisted plate (7) shown in Figs. 14 and 15 was selected as the test object, and an air flow noise silencing test was conducted. .

As a result, a remarkable silencing effect on high-frequency sound waves was obtained without any significant decrease in airflow pressure.

The internal pressure of a flow pipe (1) with a diameter of 300 m and a total length of 1.200 m, the muffler of the present invention in which twisted plates (7) shown in Figs. 14 and 15 are connected and arranged, and the flow pipe (1) is twisted. Regarding two types of silencers: a conventional type silencer that does not have a plate (7) at all,
We compared their silencing effects. The test conditions were 4 twisted sheet metals, noise input of 100 db, sound range of 500 to 1.200 cycles, and air velocity IQ@/sec, and test results as shown in Table 1 and 2 were obtained.

Table 1 shows the amount of noise attenuation for the present invention and conventional silencers.

The second light shows the pressure loss of airflow for the silencer of the present invention and the conventional UJt type.

As shown in the test results shown in Table 2, it was revealed that the silencer of the present invention has a significantly greater noise reduction effect than the conventional type, and the pressure loss of the airflow is relatively small.

That is, a muffler with an extremely large muffling efficiency - muffling effect/pressure loss was obtained.

In addition, when applying the muffler of the present invention to a muffler for exhaust such as an internal combustion engine, the twisted plate (7) provided in the flow pipe (1i)
1, (81, (9), for part or all of the flat members,
Alternatively, by adsorbing various catalysts to the main body of the flow pipe f11 or pasting or adding substances containing various catalysts, a twisted plate (
7), (8), (9) By replacing the main body of the flat plate α or flow pipe (1) with a twisted plate, flat plate, or flow pipe made of various catalysts or substances containing various catalysts, the original In addition to the sound deadening effect, it was also highly effective in removing toxic gases from exhaust gas.

[Brief explanation of the drawing]

Figures 1, 2, and 3 are all schematic cross-sectional views of conventional W buried silencers. Figure 1 is for absorption silencing, Figure 2 is for expansion silencing, and The figure is intended for resonance silencing. 4, 6, and 8 show various types of silencing chambers (B), tc+,
(D+, (This is an axial cross-sectional view showing the tubular flow path of the fluid, and FIGS. 5, 7, and 9 are respectively at positions S, -S, and 6 in FIG. 4. Position S2-S in the figure
2 is a radial cross-sectional view of the flys as in FIG. 8; Figure 10, Figure 12, Figure 14, Figure 16,
18, 20, and 22 are perspective views of various sheet-like elements to be provided in the fluid tubular flow path (4) of the silencer of the present invention, and FIGS. 11, 13, Figure 15,
17, FIG. 19, FIG. 21, and FIG. 23 are positions 54-S in FIG. 10 and positions S in FIG. 12, respectively. -S, , position 56-S in Fig. 14, , position S in Fig. 16, ~87, position S, -S in Fig. 18
20, -S9, and position S in FIG. 22. -810 is a radial cross-sectional view. In Figures 4 to 9, A is a tubular flow path, B is a sound absorption chamber, and C is a
is a sound absorption and resonance chamber or a sound absorption and expansion chamber, D is a sound absorption and resonance chamber,
E indicates an expansion chamber, 1 is a fluid flow pipe, 2 is a jacket pipe, 3 is a
4 is a Franz plate, 4 is a connecting pipe, 5 is a sound absorbing material, and 6 is a partition wall. In FIGS. 10 to 23, 1 is a fluid flow pipe, 7 is a twisted plate, 8 is a twisted plate integrated with the flow pipe, 9 is a twisted plate integrated with a pair of semicircular flow pipes, and 10 is a twisted plate integrated with a pair of semicircular flow pipes. A pair of semi-elliptical flat plates is shown. Patent applicant: Hiroo Ichikawa (and 1 other person) Figure 1 Figure 2 Figure 3 v Figure 14 Figure 15 and - Figure 16 Figure 17 L, :' Figure 18 Figure 19 L-♂ Figure 21 - y ・□ Figure n Figure 23 Procedural amendment (method) % formula % 1. Indication of the matter N Patent Application No. 57-081305 of 1981 2. Provisional proposal Relationship with the case of a person who makes a name silencer 3, supplementary if 2 Patent application Person Address 3-9 Takada, Toshima-ku, Toshima 171 Name Name Hiroo Ichikawa
(Others/Names) 4.Date of amendment order: August 1980 5.Specification subject to amendment 6.Engraving of statement of contents of compensation 52

Claims (1)

[Claims] ■ A silencer, a flow pipe made of a sound-transmitting material, and notes arranged in the axial direction inside the flow pipe! A silencer made of cum. 2. A silencer comprising the flow pipe according to claim 1, which is basically continuous over the entire length. 3. A sound deadening device in which the 7-1 landscape collection described in claim 1 is straddled within the pipe so that the effective cross-sectional area of the flow passage in the radial direction is, in principle, substantially constant over the entire length of the flow pipe. vessel. 4. A silencer in which the sheet-like sheet 18 described in claim 1 is formed into twisted plates or flat plates, which are connected or discontinuously arranged in a flow pipe.