JP2002047911A - Silencer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a silencer simplified in structure and reduced in cost without lowering a muffler effect. SOLUTION: This silencer 10 is provided with a main body 12 mounted on a vacuum generator 110 and a box-shaped case 14 mounted on the main body 12. In an, internal space of the case 14, a buffer material 36 and muffler materials 38 and 40 are stored. In the muffler material 38, air is introduced to the inside by inserting a passage 44 into a cylinder part 22 of the main body 12 for introducing air injected from an exhaust port 114 of the vacuum generator 110. Air introduced into the muffler material 38 is silenced because energy is taken away while air is discharged to a passage 46 of the muffler material 40 and air is discharged from an exhaust port 34. Therefore, the structure of the case 14 is simplified, working can be easily performed and the silencer becomes inexpensive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silencer, and more particularly to a silencer for reducing noise of air jetted from an air jet source such as a vacuum generator.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional silencer 100 and a vacuum generator 110. This vacuum generator 11
Reference numeral 0 denotes an ejector vacuum generator that supplies a pressure fluid such as compressed air to obtain a vacuum, and includes a pressure fluid supply port 112 to which the pressure fluid is supplied and an exhaust port 1 to discharge the pressure fluid.
14, and a vacuum port 116 for obtaining a vacuum. A diffuser 118 is provided between the pressure fluid supply port 112 and the exhaust port 114. The diffuser 118 is disposed near the nozzle orifice by ejecting a pressure fluid from a nozzle (not shown) into the diffuser 118. A negative pressure is generated at the vacuum port 116.

At this time, since the air is rapidly discharged to the atmosphere at the exhaust port 114, noise is generated. However, the silencer 1 attached to the exhaust port 114 side
00 is configured to suppress noise.

As shown in FIG. 6, the silencer 100 has a box-shaped case 120 with a bottom.
A gasket 121 is interposed between the opening 20 and the vacuum generator 110 so that the gasket 121 is prevented from coming off by a fixing pin P, and is attached. The internal space of the case 120 is divided into a first muffling chamber 124 and a second muffling chamber 126 by a partition 122 formed integrally with the case 120, and both muffling chambers have rectangular cross sections formed in the partition 122. The communication holes 128 communicate with each other.

[0005] A first silencing chamber 124 is provided with a silencing material 130 formed in a cylindrical shape.
Is attached to the vacuum generator 110, the internal passage 132 of the silencer 130 is communicated with the exhaust port 114 through the circular hole 133 of the gasket 121, and the air (exhaust) ejected from the exhaust port 114 is discharged into the silencer 130. Is to be introduced. After passing through the sound deadening material 130, the air flows from the first sound deadening chamber 124 through the rectangular hole 128 into the second sound deadening chamber 126.

[0006] An inner cylinder 134 is disposed in the second muffler chamber 126, and upper and lower inner wall surfaces of the second muffler chamber 126 and the inner cylinder 13 are arranged.
A flow path is formed between the outer peripheral surface and the outer peripheral surface of the air passage 4 to divide the flow of air into two. Each of the flow paths is closed by a plate-shaped sound deadening material 136 wound around the outer peripheral surface of the inner cylinder 134 (see FIG. 6B). Further, rectangular exhaust ports 138A, 138B, 138C communicating with the outside are formed in the side walls and the upper and lower wall side ends of the second sound deadening chamber 126.

As a result, the air that has flowed into the second silencing chamber 126 splits around the inner cylinder 134 into two parts, and
To the exhaust port 13
8A, 138B and 138C are discharged to the outside.

[0008] As described above, the air blown out from the exhaust port 114 of the vacuum generator 110 passes through the first muffling chamber 124 and the second muffling chamber 126 of the silencer 100, and has energy generated by the muffling material 130 and the muffling material 136. Will be absorbed and silenced.

[0009]

However, in the above silencer 100, the shape of the case 120 provided with the partition wall 122 and the communication hole 128 is complicated, so that the workability is poor and the cost is high.

The present invention has been made in view of the above circumstances, and has as its object to provide a silencer with a simplified structure and reduced cost without deteriorating the silencing effect.

[0011]

According to a first aspect of the present invention, there is provided a body attached to an air ejection source and provided with an inflow port through which the air flows, and a body provided in the main body and flowing from the inflow port. A case in which the closed air is introduced, a case attached to the main body to form a closed space, and a discharge port for discharging air that has passed through the cylindrical portion, and a case housed in the closed space, And a discharge passage which forms a partition wall between the introduction passage and the discharge passage and communicates with the discharge port.

According to the first aspect of the present invention, the air jetted from the air jet source flows in from the inflow port of the silencer main body, is guided by the cylindrical portion, and is discharged to the introduction passage of the silencing member. Furthermore, this air is guided from the introduction passage to the inside of the muffling member, passes through a partition formed by the muffling member,
The energy is absorbed and discharged to the discharge passage, and then discharged from the discharge port as it is.

As described above, the introduction passage and the discharge passage constituting the air flow path are provided in the muffling member, and the two passages are separated by the muffler partition. There is no need to divide the silencer by providing the silencer and communicate with each other through the communication port, so that the workability of the case is improved and the silencer can be manufactured at low cost. Further, the assembling work for storing the muffling member in the case becomes easy.

According to a second aspect of the present invention, in the silencer according to the first aspect, the silencing member is formed of a porous body having a fine pore structure, and the first silencing member is provided with the introduction passage. A second pore having a smaller average diameter of the fine pores than the first silencer and having the discharge passage;
And a silencer.

According to the second aspect of the present invention, the muffling member is
For example, it is formed of a porous body having a fine pore structure having a sound deadening effect, such as PVF (polyvinyl formal) or a sponge, and includes a first sound deadening material provided with an introduction passage and a second sound deadening material provided with a discharge passage. In addition, the second silencer is a porous body having an average diameter of fine pores smaller than that of the first silencer.

[0016] This makes it possible to obtain a larger energy absorbing effect by the second silencer without deteriorating the flow of air introduced into the first silencer from the introduction passage, thereby improving the silencer effect. Can be.

According to a third aspect of the present invention, in the silencer according to the first or second aspect, a cushioning member is disposed between the air outlet side of the cylindrical portion and the case. .

According to the third aspect of the invention, the cushioning material such as wool felt is disposed between the air outflow side of the cylinder and the case, so that the energy of the air ejected from the cylinder and colliding with the case can be improved. Is absorbed by the cushioning material, thereby suppressing an increase in noise level.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] An embodiment of the present invention will be described below with reference to the drawings. 1 and 2
The silencer 10 according to the first embodiment of the present invention
, A conventional vacuum generator 110 is shown.

The silencer 10 has a substantially rectangular parallelepiped main body 12 mounted on a mounting surface 110A provided with an exhaust port 114 of a vacuum generator 110, and a box-shaped case having a bottom and a hollow inside which is mounted on the main body 12. 14 is provided. A gasket 16 is interposed between the vacuum generator 110 and the main body 12 as in the related art, and a substantially U-shaped fixing pin P is straddled between the long hole 111 of the vacuum generator 110 and the long hole 18 of the main body 12. It is a structure that can be positioned and prevented from falling off by being inserted.

Near one end of the main body 12 (vacuum generator 110
(The exhaust port 114 side), a cylindrical connecting portion 20 inserted into the exhaust port 114 in a state of being attached to the vacuum generator 110, and a cylindrical shape that communicates with the connecting portion 20 and extends in the opposite direction. Is protruded. Connecting part 20
The end of the diffuser 118 on the discharge port side is inserted into the inflow port 24 serving as the opening of the connecting section 2 so that the air to be discharged is connected to the connecting section 2.
It flows in from 0 and is guided to the cylindrical portion 22. Note that an O-ring 26 is fitted into the leading edge of the connecting portion 20 to seal the space between the connecting portion 20 and the exhaust port 114.

The periphery of the outer side surface of the main body 12 where the cylindrical portion 22 is provided is a step 28, and the case 14
Is fitted to the main body 12 by fitting the peripheral edge of the main body to the step portion 28. Rear end wall 3 of case 14 facing opening 30
A circular exhaust port 34 is bored near the other end of the second. In the interior space of the case 14, a buffer material 36 made of wool felt is disposed on the side of the rear end wall 32, and furthermore, sound absorbing materials 38 and 40 formed of PVF having a fine pore structure are filled. ing.

The cushioning member 36 has a rectangular thin plate shape and is substantially the same size as the inner wall surface of the rear end wall 32, and has a circular opening 4 having the same size as the exhaust port 34 at a position corresponding to the exhaust port 34.
2 are drilled.

The silencing material 38 has an average diameter of fine pores of 300
The muffler 40 is made of a PVF material having a thickness of 60 μm, and the average diameter of the fine pores is smaller than that of the muffler 38.
It is made of VF material. These silencers 38, 4
No. 0 has a rectangular parallelepiped shape having the same size, and has passages 44 and 46 having a circular cross section penetrating along the longitudinal axis, and as shown in FIG. When stored in the case 14, the passage 46 of the silencing material 40
Is the exhaust port 3 of the case 14 through the opening 42 of the cushioning material 36.
4 and the outer surfaces of the silencers 38 and 40 are in close contact with the inner wall surface of the case 14 (FIG. 2).
reference).

When the case 14 accommodating the sound deadening materials 38 and 40 is attached to the main body 12, the passage 44 of the sound deadening material 38 is inserted into the cylindrical portion 22 of the main body 12, and a gap is provided between the passage 44 and the cylindrical portion 22. 48 are formed.

Next, the operation of the present embodiment will be described.

The pressure fluid supply port 1 of the vacuum generator 110
When compressed air is supplied from an air compressor or the like arranged in the pipe 12, the compressed air is ejected from the nozzle 140 and flows into the diffuser 118. Further, the compressed air passes through the diffuser 118 as it is, and
4, and is spouted out to the silencer 10, and the pressure drop at this time causes the inside of the pipe connected to the vacuum port 116 to have a negative pressure to act on the vacuum equipment connected to the end of the pipe.

The air jetted from the exhaust port 114 and flowing into the silencer 10 passes through the inside of the cylindrical portion 22 of the main body 12 and flows toward the rear end wall 32 of the case 14 as schematically shown by an arrow in FIG. It is gushing. Here, the collision energy of the ejected air to the case 14 is reduced by the buffer material 36, so that noise is suppressed.

Further, the air flows into the gap 48 as it is and is introduced into the sound deadening material 38, passes through the inside of the sound deadening material 38, enters the sound deadening material 40, and travels around the sound deadening material 40 to the passage 46. Is discharged. At this time, the energy of the air is mainly absorbed by the partition wall 50 formed between the passage 44 of the sound deadening material 38 and the passage 46 of the sound deadening material 40 to reduce noise.

The air exhausted to the passage 46 is exhausted from the exhaust port 34 of the case 14 to the outside.

As described above, in the silencer 10 according to the present embodiment, the main body 12 provided with the inflow port 24 which is attached to the vacuum generator 110 and into which air flows, and the A case 14 having a cylindrical portion 22 into which the inflowing air is introduced, an exhaust port 34 attached to the main body 12 to form a closed space, and discharging air passing through the cylindrical portion 22, and housed in the closed space of the case 14. A silencer 38 having a passage 44 which is inserted into the cylindrical portion 22;
And a silencer 40 that is housed in the closed space of the case 14 and forms a partition 50 between the passage 44 and the passage 46 that communicates with the exhaust port 34. The noise can be reduced without providing the opening, the processability of the case 14 is improved, and the case 14 can be manufactured at low cost.

Further, in the present embodiment, the silencing member 38 having a porous body as the silencing member and having a passage 44 for introducing air is provided.
And a silencer 40 having a passage 46 for discharging air and having an average diameter of the small pores smaller than that of the silencer 38, thereby deteriorating the flow of air introduced from the passage 44 into the silencer 38. Without causing the noise absorber 40 to obtain a larger energy absorbing effect,
The silencing effect is improved.

Further, in the present embodiment, the cushioning member 36 is disposed between the air outlet side of the cylindrical portion 22 and the case 14, so that the energy of the air ejected from the cylindrical portion 22 and colliding with the case 14 is reduced. Absorbed by the material 36, the increase in noise level is suppressed.

The average diameter of the fine pores of the sound deadening materials 38 and 40 is not limited to the combination of the present embodiment, but can be appropriately changed according to the noise level, the size of the silencer, and the like. Also, the shapes of the main body 12 and the case 14 are not limited to the present embodiment, and it is sufficient that the closed space for accommodating the sound deadening materials 38 and 40 and the cushioning material 36 can be constituted by a combination thereof. It is also possible to adopt a structure in which the opening of the main body is closed with a case-like shape.

[Second Embodiment] Next, a second embodiment of the present invention will be described. Note that the same components as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

FIG. 4 shows a silencer 60 and a vacuum generator 110 according to a second embodiment of the present invention.
Here, the sound deadening material 62 housed in the case 14 is made of a PVF material having an average diameter of the fine pores of about 100 to 200 μm, and a passage communicating with the passage 44 inserted into the cylindrical portion 22 and the exhaust port 34. 46 and an integral structure.

Even if the silencing material is configured in this manner, the energy of the air injected mainly by the partition 50 of the silencing material 62 can be absorbed, as in the first embodiment, without impairing the silencing effect. The structure of the silencer 60 can be simplified. Further, the assembling work for accommodating the sound deadening material 62 in the case 14 is also facilitated.

[0038]

Since the silencer of the present invention has the above-described structure, the structure can be simplified without lowering the noise reduction effect, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a disassembled state of a silencer according to a first embodiment of the present invention and a conventional vacuum generator.

FIG. 2 is a plan sectional view of the silencer and the vacuum generator of FIG. 1;

FIGS. 3A and 3B are diagrams illustrating the flow of air in the silencer according to the first embodiment of the present invention, wherein FIG. 3A is a plan sectional view, and FIG. 3B is a sectional view taken along line BB of FIG. It is.

FIG. 4 is a perspective view showing a disassembled state of the silencer according to the first embodiment of the present invention and a conventional vacuum generator.

FIG. 5 is a perspective view showing a state in which a part of a conventional silencer is broken and a vacuum generator.

6A and 6B are views for explaining the flow of air in a conventional silencer, where FIG. 6A is a plan sectional view, and FIG.
It is a B sectional view.

[Explanation of symbols]

 10, 60 Silencer 12 Main body 14 Case 22 Cylindrical part 24 Inlet 34 Exhaust port 36 Buffer material 38 Silencer (first silencer) 40 Silencer (second silencer) 44 Passage (introduction passage) 46 Passage (discharge passage) 50 Partition wall 62 Sound-absorbing material (muffling member) 110 Vacuum generator (air ejection source)

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F04C 29/06 F04C 29/06 A F04D 29/66 F04D 29/66 G (72) Inventor Masahiro Homitsu Tokyo 3-33-9 Yaguchi, Ota-ku, Tokyo F-term (reference) 3M004 AA10 CA14 DA04 FA02 FA08 GA01 3H003 AA06 AC02 AD03 BA04 BA08 3H029 AA01 AB06 BB21 CC28

Claims (3)

[Claims] 1. A main body attached to an air ejection source and provided with an inflow port through which the air flows, a tubular portion provided in the main body, and into which air introduced from the inflow port is introduced; A case having a discharge port that is attached to form a closed space and discharges air that has passed through the cylindrical portion; an introduction passage housed in the closed space and inserted into the cylindrical portion; A silencer comprising: a silencing member provided with a discharge passage communicating with the discharge port by forming a partition wall therebetween. 2. The sound deadening member is formed of a porous body having a fine pore structure, and has a first sound deadening material provided with the introduction passage, and an average diameter of the fine holes is smaller than that of the first sound deadening material. A second silencer provided with the discharge passage,
The silencer according to claim 1, wherein the silencer comprises: 3. A cushioning material is disposed between an air outflow side of the cylindrical portion and the case.
Or the silencer according to claim 2.