JPH1018926A - Silencing device for fluid gas passage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an entirely new silencing mechanism capable of effectively silencing noise having a wide range wavelength. SOLUTION: A cleaner case 1 is constituted of a cleaner cover 2 having an outside air inlet 4 and a cleaner cover 2 having a purified air outlet 6, and anannular cleaner element 5 is housed in the cleaner case 1. The vibration energy of the base plate 3 is converted into thermal energy to silence noise, by providing the base plate 3 facing the air intake port 21 of an engine constituting a fluid gas passage 4 to constitute a vibrating member, and supporting the base plate 3 by damping materials 17a and 17b having vibration absorbing high polymer structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silencer for a fluid gas passage which can be applied to, for example, an air cleaner, a muffler of an engine, and other air supply / exhaust ducts, and can effectively muffle noise in a wide wavelength range. Provides a completely new silencing mechanism that can.

[0002]

2. Description of the Related Art As a basic form of a silencer for a fluid gas passage, for example, those shown in FIGS. 12A to 12C are conventionally known. 12A is a schematic diagram showing an expansion type silencer, FIG. 12B is a schematic diagram showing a resonance type silencer, and FIG. 12C is a schematic diagram showing an absorption type silencer. Each arrow indicates the traveling direction of the noise.

As shown in FIG. 12 (A), the above-mentioned inflatable silencer reflects a specific frequency component at an end by providing a cavity 13 having a large volume in the fluid gas passage 4.
Mutes noise by causing sound waves to interfere with each other. As shown in FIG. 12 (B), the above-described resonance type silencer has a sound-absorbing communication hole 14 formed in the fluid gas passage 4 and is covered with a cavity 13 so as to cover the cavity.
Suppress noise near the resonance frequency. As shown in FIG. 12 (C), the absorption type silencer has a sound absorbing material 26 adhered to the inner surface of the cavity 13 communicating with the fluid gas passage 4, and the viscosity of air entering a small hole inside the sound absorbing material. Absorbs energy by resistance and mechanical friction between structures to muffle sound.

[0004] In the prior art, the combination of the above three basic forms has been devised to enhance the sound deadening effect. Incidentally, FIG. 11 relates to the proposal of the present applicant (disclosed in Japanese Utility Model Laid-Open No. 7-4864), and in order to enhance the sound deadening effect of the air cleaner, the outside air intake port 104 is shown.
Cleaner body 102 having a bottom and a clean air outlet 106 and bottom cover 1
03, a cleaner case 101, a cleaner element 105 is housed in the cleaner case 101, and the purifying outlet 106 and a carburetor (not shown) are connected to a volumetric silencer 110 combining an expansion type and a resonance type. It is configured to communicate via.

[0005] The positive displacement silencer 110 penetrates the air purifying cylinder 111 through the silencing cylinder 112, forms a space contained in the silencing cylinder 112 as a silencing chamber 113. Noise reduction communication passage 11 communicating with 113
4 is provided to reduce the intake pulsation sound, the explosion sound, etc. leaking to the outside from the engine intake pipe via the carburetor / air cleaner.

[0006]

However, the above 3)
In a silencer that combines various basic forms, there is a frequency component that is not attenuated at all or is amplified in the opposite direction. Therefore, when a wide range of noise is generated such as an engine, the silencer is effectively silenced. Can not do it. The present invention has been made in view of such circumstances, and provides a completely new silencing mechanism. It is an object of the present invention to provide a silencing device capable of effectively silencing noise in a wide wavelength range. .

[0007]

The present invention is configured as follows in order to solve the above problems. That is, according to the first aspect of the invention, the vibrating member 3 for converting the sound pressure fluctuation in the fluid gas passage 4 into mechanical vibration is provided, and the vibrating member 3 is supported by the vibration damping material 17 of the vibration absorbing polymer structure. Thus, the vibration energy of the vibrating member 3 is converted into heat energy to mute the sound.

According to a second aspect of the present invention, in the fluid gas muffler according to the first aspect, the cleaner case includes the cleaner cover having the outside air inlet and the base plate having the clean air outlet. An annular cleaner element 5 is accommodated in the cleaner case 1, and a base plate 3 constituting the vibration member 3 is provided so as to face an intake port 21 of an engine constituting the fluid gas passage 4. 3 is supported by the vibration damping material 17.

According to a third aspect of the present invention, in the noise reduction device for a fluid gas passage according to the second aspect, the air purifying outlet 6 and the intake port 21 of the engine communicate with each other through a positive displacement type noise reduction device 10, and The mold silencer 10 forms a space between the clean air introduction cylinder 11 and a silence cylinder 12 containing the clean air introduction cylinder 11 as a silence chamber 13 and communicates with the silence chamber 13 to the clean air introduction cylinder 11. The sound deadening communication hole 14 is opened, and the end wall 12A of the sound deadening cylinder 12 is fixed to the base plate 3 so as to be able to advance and retreat, so that the internal volume of the sound deadening chamber 13 can be changed. An intake communication hole 15 that communicates with the clean air introduction cylinder 11 is opened in the other end wall 12B of the cylinder 12, and the intake communication hole 15 communicates with the intake port 21.

According to a fourth aspect of the present invention, in the silencer for a fluid gas passage according to the third aspect, the clean air introduction tube 11 is aligned with the clean air outlet 6 and protrudes downstream from the base plate 3. The damping member 17a is provided with one end wall 12A of the silencer tube 12 with respect to the base plate 3 and the other end wall 11B of the air purification introduction tube 11 with respect to the other end wall 12B of the silencer tube 12. -It is characterized by being fixed so as to be able to advance and retreat via 17b.

According to a fifth aspect of the present invention, in the silencer for a fluid gas passage according to the third aspect, the upstream side portion 11a of the purified air introducing cylinder 11 is made to match the purified air outlet 6 and is downstream from the base plate 3. And a downstream portion 11b of the air purification introducing tube 11 is aligned with the intake communication hole 15 and protrudes upstream from one end wall 12A of the silencing tube 12, and the upstream side The portion 11a and the downstream portion 11b are slidably fitted together, and the muffler communication hole portions 14a and 14a formed in the upstream portion 11a and the downstream portion 11b, respectively.
The sound deadening communication hole 14 is constituted by 14b, and the opening area of the sound deadening communication hole 14 can be changed.

According to a sixth aspect of the present invention, in the muffler for a fluid gas passage according to the first aspect, the tail pipe 37 is protruded from the muffler case 31 and the inner end of the tail pipe 37 is connected to the fluid gas passage 4. The tail pipe fixing plate 3 that opens to face the exhaust muffler 33c that constitutes the vibrating member 3
8 is fixed to the inner wall of the muffler case 31 via the vibration damping material 17.

According to a seventh aspect of the present invention, in the fluid gas passage muffler according to the first aspect, a partition 43 having a muffling communication hole 44 is provided at an end of a duct 41 constituting the fluid gas passage 4. The chamber 42 is divided into compartments, the vibrating member 3 is provided in the silencing chamber 42, and the vibrating member 3 is supported by the vibration damping material 17.

According to an eighth aspect of the present invention, in the device for silencing a fluid gas passage according to the first aspect, a silencing cylinder 53 constituting the vibration member 3 is provided at an intermediate portion of a duct 51 constituting the fluid gas passage 4. The silencer 53 and the duct 5
While forming the space between the two as a muffling room 52,
A sound deadening communication hole 54 communicating with the sound deadening chamber 52 is opened in the duct 51, and at least both ends of the sound deadening cylinder 53 are externally fitted and fixed to the duct 51 via a seal member 57 constituting the vibration damping material 17. It is characterized by the following.

[0015]

The invention described in claim 1 provides a completely new silencing mechanism, and vibrates sound pressure fluctuations in the fluid gas passage 4 even when noise of a wide range of wavelengths is generated. The vibration is converted into mechanical vibration by the member 3, and the vibration energy of the vibration member 3 is converted into heat energy by the vibration damping material 17 having a polymer structure for vibration absorption that supports the vibration member 3, thereby silencing the sound. Thus, noise in a wide wavelength range can be effectively silenced.

According to the second aspect of the present invention, the fluid gas passage silencer according to the first aspect is applied to an air cleaner of an engine, and the fluid gas passage silencing device is configured to face the intake port of the engine constituting the fluid gas passage. Since the base plate 3 that constitutes the vibration member 3 is provided and the base plate 3 is supported by the vibration damping material 17, the mechanical vibration energy of the base plate 3 is transmitted by the vibration damping material 17 that supports the base plate 33. Converts to heat energy and silences it. Thereby, the same operation and effect as the invention described in claim 1 can be obtained.

According to the third aspect of the present invention, in the noise reduction device for a fluid gas passage according to the second aspect applied to an air cleaner of an engine, the end wall 12A of the noise reduction cylinder 12 can be adjusted forward and backward with respect to the base plate 3. Fixed to the silencer 13
Is configured to be changeable, it is possible to change the internal volume of the muffling chamber 13 in accordance with the frequency component to be muffled.

Further, in the invention described in claim 3, the purifying air introducing cylinder 11 is made to coincide with the purifying air outlet 6 so as to project toward the downstream side from the base plate 3, and the one end wall 12 of the silencing cylinder 12 is provided.
Since A is fixed to the base plate 3, the air cleaner and the volumetric silencer can be substantially integrated. As a result, the number of parts is reduced, and the cost of the silencer air cleaner can be reduced.

According to a fourth aspect of the present invention, in the noise reduction device for a fluid gas passage according to the third aspect, the clean air introduction cylinder 11 is aligned with the clean air outlet 6 and is directed downstream from the base plate 3. The end wall 12A of the silencing tube 12 is protruded from the base plate 3 with respect to the one end wall 12A of the air purifying introduction tube 11.
1B is fixed to the other end wall 12B of the silencing cylinder 12 via the damping members 17a and 17b so as to be able to advance and retreat, so that the mechanical vibration of the base plate 3 due to the sound pressure fluctuation is reduced. The heat energy is converted into heat energy by the heaters 17a and 17b, and noise in a wide wavelength range can be significantly reduced.

According to a fifth aspect of the present invention, in the fluid gas passage silencer according to the third aspect, the upstream portion 11a and the downstream portion 11b of the clean air introducing cylinder 11 are slidably fitted. The upstream portion 11a and the downstream portion 11
The sound deadening communication hole 14 is formed by the sound deadening communication hole portions 14a and 14b respectively formed in b.
Since the opening area of the muffler can be changed, it is possible to change not only the internal volume of the muffling chamber 13 but also the opening area of the muffler communication hole 14 according to the model of the engine and the like. This allows the volumetric silencer to be more accurately adapted to the main frequency components to be silenced.

According to the invention described in claim 6, the muffler of the engine is applied to the muffler of the engine, wherein the tail pipe 37 is protruded from the muffler case 31.
The inner end of the tail pipe 37 is opened to face the exhaust silencer chamber 33c constituting the fluid gas passage 4, and the tail pipe fixing plate 38 constituting the vibration member 3 is muffled through the vibration damping material 17 through the muffler 17. Since the tail tube fixing plate 38 is fixed to the inner wall of the case 31, the mechanical vibration energy of the tail tube fixing plate 38 is converted into heat energy by the vibration damping material 17 supporting the tail tube fixing plate 38, and the sound is silenced.
Thereby, the same operation and effect as the invention described in claim 1 can be obtained.

According to a seventh aspect of the present invention, the fluid gas passage silencer described in the first aspect is applied to a duct for supply / exhaust or the like, and the end of a duct 41 constituting the fluid gas passage 4 is silenced. The partition wall 43 having the hole 44 is provided to provide the muffling chamber 4
2 and the vibration member 3 is provided in the sound deadening chamber 42, and the vibration member 3 is supported by the vibration damping material 17, so that the sound deadening device functions as a positive displacement sound deadening device. Besides, the mechanical vibration energy of the vibrating member 3 is converted into thermal energy by the damping material 17 supporting the vibrating member 3 to mute the sound. Thereby, the same operation and effect as the invention described in claim 1 can be obtained.

According to an eighth aspect of the present invention, the silencer for a fluid gas passage according to the first aspect is applied to a duct for supply / exhaust or the like, and the vibration is provided at an intermediate portion of a duct 51 constituting the fluid gas passage 4. A silencing tube 53 constituting the member 3 is externally fitted, and a space between the silencing tube 53 and the duct 51 is formed in the silencing chamber 5.
2 and open a sound deadening communication hole 54 communicating with the sound deadening chamber 52 in the duct 51, and at least both ends of the sound deadening cylinder 53 are connected to the duct 51 via a seal member 57 constituting the vibration damping material 17. The muffler acts as a positive displacement muffler and also converts the mechanical vibration energy of the muffler 53 into thermal energy with the damping material 17 supporting the muffler 53 to muffle the sound.
Thereby, the same operation and effect as the invention described in claim 1 can be obtained.

[0024]

Embodiments of the present invention will be described below in more detail with reference to the drawings. FIG. 4 is a perspective view of a vertical air-cooled gasoline engine in which a silencer according to the present invention is applied to an air cleaner, FIG. 1 shows a silencer type air cleaner according to a first embodiment, and FIG. , FIG.
(B) is a front view thereof. FIG. 2 is an exploded perspective view of the silencing air cleaner. It should be noted that reference symbol E in FIG.
Indicates the entire engine, 8 indicates a silenced air cleaner, 20 indicates
Denotes a carburetor, 23 denotes an intake pipe, 25 denotes a muffler, 26 denotes a fuel tank, 27 denotes a fan cover, and 28 denotes a hand starting handle.

This silencer type air cleaner 8 is shown in FIG.
As shown in FIG. 2B and FIG.
The cleaner case 1 is constituted by the cleaner cover 2 having the above-mentioned structure and the base plate 3 having the clean air outlet 6, and the annular cleaner element 5 is sandwiched and accommodated between the base plate 3 which is the vibration member and the cleaner cover 2. Then, the head of a fastening bolt 18b is fixed to a fixing bracket 18a fixed to the base plate 3, and the threaded end of the fastening bolt 18b is projected from the cleaner cover 2 and screwed and fastened with a wing nut 18c. The purified air outlet 6 and the intake port 21 of the engine E forming the fluid gas passage 4 are communicated with each other via the volumetric silencer 10. Note that reference numeral 5a in FIG. 2 denotes a filter paper member of the cleaner element 5, and 5b denotes a sponge member externally fitted to the cleaner element 5. Hereinafter, the characteristic configuration of the present invention will be described.

The positive displacement silencer 10 includes a clean air introduction tube 11 that is aligned with the clean air outlet 6 and integrally protrudes downstream from the base plate 3, and includes the clean air introduction tube 11. A silencing tube 12; a space between the air purifying tube 11 and the silencing tube 12 is formed as a silencing chamber 13;
In addition, a muffling communication hole 14 that communicates with the muffling chamber 13 is opened. One end wall 12A of the muffler cylinder 12 is attached to the base plate 3 and the other end wall 11B of the clean air introduction cylinder 11 is arranged.
Is fixed to the other end wall 12B of the silencer cylinder 12 via vibration damping members 17a and 17b having a polymer structure for absorbing vibration, so as to be able to advance and retreat.

The above-described vibration damping material 17a having a polymer structure for absorbing vibrations
As 17b, for example, there is a damping material manufactured by Samsung Belt Co., Ltd., which has the kind and characteristics shown in Table 1, for example.

[Table 1]

Here, the dynamic elastic modulus (E ') is a measure of the magnitude of the resistance to an external force at a specific frequency.
“anδ” indicates a measure of the magnitude of the vibration suppression / vibration absorption performance at a specific frequency. By adopting the vibration damping polymeric materials 17a and 17b for absorbing vibration,
Mechanical vibration of the base plate 3 due to sound pressure fluctuations is suppressed by this damping material 1.
It is converted into heat energy by 7a and 17b and silenced.
By adopting a completely new silencing mechanism, it is possible to effectively muffle noise in a wide wavelength range.

The damping material 17a also serving as a spacer.
The internal volume of the silencing chamber 13 can be changed by appropriately setting the thickness of 17b. The other end wall 12B of the silencer tube 12 is provided with an intake communication hole 15 communicating with the clean air introduction cylinder 11, and the intake communication hole 15 is communicated with the intake port 21 of the carburetor 20 via the gasket 22. . In this way, by configuring the internal volume of the noise reduction chamber 13 to be changeable, even if the type of the engine is changed and the frequency component to be reduced is changed, the noise reduction chamber 13 is adapted to the main frequency component to be reduced. The inner volume can be changed.

Further, as described above, the air purifying cylinder 11 is aligned with the gas purifying outlet 6 and protrudes downstream from the base plate 3, and one end wall 12 A of the silencer 12 is attached to the base plate 3. By fixing the air cleaner and the positive displacement silencer 10, the air cleaner and the positive displacement silencer 10 can be substantially integrated. As a result, the number of parts is reduced, and the cost of the silencing air cleaner can be reduced.

FIG. 3 shows an existing air cleaner for a rice transplanter and an air cleaner employing urethane as a vibration damping material, and the above-described sound damping material employing a vibration damping material having a polymer structure for absorbing vibration (Table 1: damping material 2). It is a graph which shows the result of having carried out the comparative test of the silencing effect with a mold air cleaner. According to this comparative test, it is shown that the vibration damping material having the polymer structure for absorbing vibration can effectively muffle noise in a wide wavelength range. In addition, it is also possible to employ a damping material having oil resistance other than the damping material shown in Table 1.

FIG. 5 is a diagram corresponding to FIG. 1A of a silencer type air cleaner showing a second embodiment in which the silencer according to the present invention is applied to an air cleaner of an engine. This embodiment is characterized in that the opening area of the silencing communication hole 14 of the air purifying cylinder 11 can be changed. That is, the upstream portion 11a of the clean air introduction cylinder 11 is aligned with the clean air outlet 6 of the base plate 3 and protruded toward the downstream side.
A downstream portion 11b of the muffler cylinder 12 is aligned with the intake communication hole 15 so as to protrude upstream from the other end wall 12B of the silencer 12;
These upstream side portion 11a and downstream side portion 11b are slidably fitted.

On the other hand, sound-absorbing communication holes 14a and 14b are formed on the upstream portion 11a and the downstream portion 11b so as to face each other, and these sound-absorbing communication holes 14a and 14b are formed.
By overlapping the oval portions of b, one silencer communication hole 14
Make up. By appropriately setting the thickness of the damping material 17a also serving as a spacer and changing the internal volume of the silencing chamber 13, the opening area of the silencing communication hole 14 also changes in conjunction with this. As a result, the volumetric silencer can be more accurately adapted to the main frequency component to be silenced, and the number of parts is reduced, so that the cost of the silencer air cleaner can be reduced.

FIG. 6 is a diagram corresponding to FIG. 1A of a silencer type air cleaner showing a third embodiment in which the silencer according to the present invention is applied to an air cleaner of an engine. This embodiment does not employ a positive displacement silencer, but provides a base plate 3 as a vibration member in an existing air cleaner, and supports the base plate 3 with a vibration damping material 17a having a polymer structure for vibration absorption. The other points are the same as those shown in FIG.

FIG. 7 is a longitudinal sectional view of a silencer type air cleaner showing a fourth embodiment in which the silencer according to the present invention is applied to an air cleaner of an engine. This embodiment also does not employ a positive displacement silencer. Instead of the silencer shown in FIG.
And the periphery of the base plate 3 is fixed to a receiving member 25 via a vibration damping material 17 having a polymer structure for absorbing vibration. Here, the reference numeral 24 in FIG.
Reference numeral 5 denotes a cleaner element, 6 denotes a clean air outlet, and 21 denotes an inlet of a carburetor.

FIG. 8 is a longitudinal sectional view of a muffler showing a fifth embodiment in which the muffler according to the present invention is applied to an engine muffler. In this embodiment, the tailpipe 37 projects from the muffler case 31 and the inner end of the tailpipe 37 is opened facing the third exhaust silencer 33c constituting a part of the fluid gas passage, and the tailpipe 37 is vibrated. Tail tube fixing plate 3 constituting the member
8 is fixed to the inner wall of a muffler case 31 via a vibration damping material 17 having a polymer structure for absorbing vibration. In FIG. 8, reference numeral 32 denotes an exhaust gas introduction pipe, reference numerals 33a and 33b denote first and second exhaust muffling chambers, respectively, and an arrow G denotes a path of exhaust gas.

FIG. 9 is a vertical sectional view of a duct showing a sixth embodiment in which the silencer according to the present invention is applied to a supply / exhaust duct. In this embodiment, a partition 43 having a sound deadening communication hole 44 is provided at the end of a duct 41 constituting a fluid gas passage 4 to form a sound deadening chamber 42, and a vibration member 3 is provided in the sound deadening chamber 42. The vibration member 3 is supported by a vibration damping material 17 having a vibration absorbing polymer structure. In addition, the code | symbol 45 in FIG. 9 is an air communication hole, 46 is a supply / exhaust port, and the arrow S has shown the traveling direction of the noise.

FIG. 10 shows a seventh embodiment in which the silencer according to the present invention is applied to an intake duct of a vacuum cleaner or the like.
10A is a vertical cross-sectional view of the main part, and FIG.
FIG. 3A is a sectional view taken along line BB in FIG. In this embodiment, an upper and lower split muffler 53 constituting the vibrating member 3 is externally fitted in the middle of a duct 51 constituting the fluid gas passage 4, and a space between the muffler 53 and the duct 51 is formed. In addition to being formed as a sound deadening chamber 52, a sound deadening communication hole 54 communicating with the sound deadening chamber 52 is opened in the duct 51, and both ends 53 a of the split sound deadening cylinder 53 and the left and right joints 5 are formed.
3b is externally fitted and fixed to the duct 51 via a pair of upper and lower sealing members 57, 57 having a polymer structure for absorbing vibration.

As shown in FIG. 10B, the duct 51 has a pair of left and right flanges 55 projecting therefrom.
Further, each seal member 57 constituting the vibration damping member 17 includes the duct 51, both ends 53 a of the split muffler 53, the flanges 55 of the duct 51, and the upper and lower mating portions 53 b of the muffler 53. For sealing, it is composed of a rectangular damping material 57b as shown in FIG. Then, a virtual line seal portion 57a corresponding to both ends 53a of the muffling cylinder
Becomes a semicircle as shown by a solid line in a sealed state. In this embodiment, in addition to acting as a positive displacement silencer, the mechanical vibration energy of the silencer
Is converted into heat energy by the seal member 57 constituting the vibration damping material 17 for supporting the sound and the sound is silenced.

In the above embodiment, the muffler is applied to an air cleaner or muffler of an engine, an intake / exhaust duct, or an intake duct of a vacuum cleaner. However, the present invention is not limited to the above embodiment. It can be widely applied to the noise prevention of the fluid gas passage.

[Brief description of the drawings]

FIG. 1 shows a first embodiment in which a noise reduction device according to the present invention is applied to an air cleaner, FIG. 1 (A) is a longitudinal side view of a noise reduction type air cleaner, and FIG. 1 (B) is a front view thereof.

FIG. 2 is an exploded perspective view of the silencing air cleaner according to the first embodiment.

FIG. 3 shows a comparison test result of a noise reduction effect between an air cleaner using an existing air cleaner and urethane as a vibration damping material and a noise reduction air cleaner using a vibration damping material 2 (MSG-DS) having a polymer structure for absorbing vibration. FIG.

FIG. 4 is a perspective view of a vertical air-cooled gasoline engine equipped with the silencing air cleaner according to the present invention.

FIG. 5 is a muffler type air cleaner showing a second embodiment in which the muffler according to the present invention is applied to an air cleaner.
(A) It is an equivalent figure.

FIG. 6 is a diagram of a silencer type air cleaner showing a third embodiment in which the silencer according to the present invention is applied to an air cleaner.
(A) It is an equivalent figure.

FIG. 7 is a longitudinal sectional view of a silencer type air cleaner showing a fourth embodiment in which the silencer according to the present invention is applied to an air cleaner.

FIG. 8 is a sectional view of a muffler showing a fifth embodiment in which the muffler according to the present invention is applied to a muffler.

FIG. 9 is a cross-sectional view showing a sixth embodiment in which the silencer according to the present invention is applied to an air supply / exhaust duct.

10 shows a seventh embodiment in which the muffler according to the present invention is applied to an intake duct of a vacuum cleaner or the like, FIG. 10 (A) is a longitudinal side view thereof, and FIG. 10 (B) is FIG. 10 (A). BB inside
FIG. 10 (C) is a perspective view of the vibration damping material.

FIG. 11 is a vertical cross-sectional view of a sound deadening air cleaner according to a conventional example.

12A and 12B show a basic form of a conventional silencer; FIG. 12A shows an expansion silencer, FIG. 12B shows a resonance silencer, and FIG. 12C shows an absorption silencer. It is a schematic diagram which shows.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cleaner case, 2 ... Cleaner cover, 3 ... Vibration member (base plate / vibration plate), 4 ... Fluid gas passage, 5 ... Cleaner element, 6 ... Clean air outlet, 10 ... Volumetric silencer, 11 ... Clean air Introducing cylinder, 11a: upstream part of the air purification introducing cylinder, 11b ... downstream part of the air purifying introducing cylinder, 11B ... other end wall of the air purifying introducing cylinder, 12 ... silencing cylinder, 12A ... one end wall of the silencing cylinder, 12B ... the other end wall of the silencing tube, 13 ... the silencing chamber, 14 ... the silencing communication hole, 14a / 14b ... the silencing communication hole portion, 15 ... the intake communication hole, 17 ... the damping material, 17a / 17b ... the damping material (spacer) , 20 ... carburetor, 21 ... engine intake, 2
4 ... outside air intake port, 31 ... muffler case, 35 ... exhaust port in case, 37 ... tail pipe, 38 ... tail pipe fixing plate, 41 ... duct, 42 ... sound deadening chamber, 43 ... partition wall, 44 ... sound deadening communication hole, 5
DESCRIPTION OF SYMBOLS 1 ... duct, 52 ... silence room, 53 ... silence cylinder, 54 ... silence communication hole, 57 ... seal member (damping material), E ... engine.

Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location F02M 35/12 F02M 35/12 L

Claims (8)

[Claims] A vibration member (3) for converting sound pressure fluctuations in a fluid gas passage (4) into mechanical vibration is provided, and the vibration member (3) is made of a vibration damping material (1) having a polymer structure for vibration absorption.
(7) The silencer for a fluid gas passage, wherein the muffler converts the vibration energy of the vibrating member (3) into heat energy and silences the vibration. 2. A cleaner case (1) comprising a cleaner cover (2) having an outside air inlet (24) and a base plate (3) having a clean air outlet (6), and inside the cleaner case (1). A base plate (3) constituting the vibrating member (3) facing the intake port (21) of the engine constituting the fluid gas passage (4); The muffler for a fluid gas passage according to claim 1, wherein the base plate (3) is supported by the damping material (17). 3. The air purifying outlet (6) communicates with an intake port (21) of the engine via a positive displacement silencer (10). A space between the silencing tube (11) and the silencing tube (12) containing the purifying tube (11) is formed as a silencing room (13), and the silencing room (13) is provided in the purifying tube (11). The silencer communication hole (14) is opened, and one end wall (12A) of the silencer tube (12) is fixed to the base plate (3) so as to be able to advance and retreat, and the silencer chamber (1) is fixed.
The internal volume of 3) can be changed, and an intake communication hole (15) communicating with the purified air introduction cylinder (11) is opened in the other end wall (12B) of the muffler cylinder (12) to form the intake communication hole. The muffler for a fluid gas passage according to claim 2, wherein the (15) is communicated with the intake port (21). 4. The purified air introduction tube (11) is fitted to the purified air outlet (6) and protrudes from the base plate (3) toward the downstream side, and one end wall of the silencing tube (12) ( 12A) with respect to the base plate (3), the other end wall (1) of the air purification introducing tube (11).
The 1B) is fixed to the other end wall (12B) of the silencer tube (12) via a damping material (17a) (17b) so as to be adjustable forward and backward, respectively. Sound gas passage silencer. 5. An air purifier according to claim 5, wherein an upstream portion (11a) of said air purifying tube (11) is aligned with said air purifying outlet (6) to protrude downstream from said base plate (3), Introduction tube (1
The downstream portion (11b) of (1) is connected to the intake communication hole (15).
And project from the one end wall (12A) of the silencer tube (12) toward the upstream side, and the upstream portion (11a) and the downstream portion (11b) are slidably fitted together. The silencing communication holes (14) are formed by the silencing communication holes (14a) (14b) formed in the upstream side portion (11a) and the downstream side portion (11b), respectively, and the opening of the silencing communication hole (14) is formed. 4. The muffler for a fluid gas passage according to claim 3, wherein the area is changeable. 6. A tail tube (3) from inside the muffler case (31).
7) is projected, the inner end of the tail pipe (37) is opened facing the exhaust silencer chamber (33c) constituting the fluid gas passage (4), and the tail constituting the vibrating member (3). The muffler for a fluid gas passage according to claim 1, wherein a pipe fixing plate (38) is fixed to an inner wall of the muffler case (31) via the vibration damping material (17). 7. A partition wall (43) having a muffler communication hole (44) is provided at a terminal end of a duct (41) constituting the fluid gas passage (4) to form a muffler chamber (42). The fluid according to claim 1, wherein the vibration member (3) is provided in the sound deadening chamber (42), and the vibration member (3) is supported by the vibration damping material (17). Gas silencer for gas passage. 8. A muffler tube (53) constituting the vibrating member (3) is externally fitted in the middle of a duct (51) constituting the fluid gas passage (4). A space with the duct (51) is formed as a sound deadening chamber (52), and a sound deadening communication hole (54) communicating with the sound deadening chamber (52) is opened in the duct (51). 2. The muffler for a fluid gas passage according to claim 1, wherein at least both ends are externally fitted and fixed to the duct (51) via a sealing member (57) constituting the vibration damping material (17). 3.