JP2019108861A - Muffler device - Google Patents

Abstract

To provide a muffler device which can be installed in a limited space inside a power generator to efficiently reduce exhaust sound.SOLUTION: The muffler device includes a casing 21. Inside the casing 21, a first partition member 30 and a second partition member 31 are provided. Between the first partition member 30 and the second partition member 31, a diffuser pipe 50 is provided. On the outer periphery of the diffuser pipe 50, a spiral pipe 57 is provided through which exhaust gas passes before flowing into the diffuser pipe 50. The spiral pipe 57 is formed with the first partition member 30 and the second partition member 31 joined together.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a muffler device, and more particularly to a muffler device applied to an engine of a portable generator.

BACKGROUND Conventionally, a muffler device for muffling an engine is known.
As such a muffler device, conventionally, for example, a technology has been provided which has an outer plate and a cylindrical outer shell for supporting each outer plate, and reduces exhaust energy by reducing exhaust energy in the muffler. (See, for example, Patent Document 1).

JP 2005-155551 A

The above-mentioned prior art relates to a muffler device of a vehicle engine. However, a generator that drives an engine and generates electric power by this driving force is known, and the above-mentioned conventional technology can not be applied as it is as a muffler device of such a generator.
In particular, portable generators are required to be lightweight and compact. Furthermore, it is necessary that the exhaust noise at the time of engine driving is also reduced.
The present invention has been made in view of the above-described point, and it is possible to provide a muffler device that can be installed in a limited space inside a generator and that can reduce exhaust noise efficiently. With the goal.

In order to achieve the above object, the present invention relates to a muffler device of a portable generator including a casing, a first partition member and a second partition member inside the casing, and the first partition member and the above A diffuser pipe is provided between the first partition member and the second partition member, and a spiral pipe for passing exhaust gas before flowing into the diffuser pipe is provided on the outer periphery of the diffuser pipe, and the spiral pipe includes the first partition member and the first It is characterized in that it is formed by joining two partition members.
According to the present invention, since the spiral pipe is formed by the first partition member and the second partition member, the muffler capacity can be secured with a simple structure, and sufficient rigidity is secured. Can. In addition, the number of welds can be reduced, and the exhaust gas can be easily sealed. Furthermore, the flow path length of the exhaust gas can be doubled by the spiral pipe, and the exhaust noise can be efficiently reduced.

In the above configuration, the spiral pipe is formed by a spiral bulging portion formed by bulging the first partition member and the second partition member by press processing.
According to the present invention, it is possible to easily form a spiral pipe by the spiral bulging portion only by pressing the first partition member and the second partition member.

In the above-mentioned configuration, the diffuser pipe is held by a spiral bulging portion of the first partition member and the second partition member.
According to the present invention, since the diffuser pipe is held by the first partition member and the second partition member, the diffuser pipe can be attached without using extra parts, and the internal space of the casing can be effectively used. Noise reduction can be achieved. In addition, the number of welds can be reduced, and the exhaust gas can be easily sealed.

In the above-mentioned configuration, the diffuser pipe is composed of an outer cylinder and an inner cylinder disposed inside the outer cylinder, and a sound deadening material is accommodated between the outer cylinder and the inner cylinder. It features.
According to the present invention, the exhaust noise flowing through the diffuser pipe can be efficiently reduced by the silencer material.

In the above-mentioned configuration, the diffuser pipe is disposed extending substantially over the entire region in the vertical direction of the casing, and the exhaust gas flows from the upper portion to the lower portion of the spiral pipe and flows in from the lower portion of the diffuser pipe It is characterized by the following structure.
According to the present invention, a large flow path of exhaust gas can be secured, and exhaust noise can be efficiently reduced by the spiral pipe and the diffuser pipe.

In the above-mentioned configuration, the outer cylinder includes a pore communicating with the spiral pipe, and the inner cylinder includes a pore communicating with the outer cylinder.
According to the present invention, the exhaust gas flows through the pores between the spiral pipe and the outer cylinder and between the outer cylinder and the inner cylinder, whereby exhaust noise can be reduced.

  According to the present invention, since the spiral pipe is formed by the first partition member and the second partition member, the muffler capacity can be secured with a simple structure, and sufficient rigidity is secured. Can. In addition, the number of welds can be reduced, and the exhaust gas can be easily sealed. Furthermore, the flow path length of the exhaust gas can be doubled by the spiral pipe, and the exhaust noise can be efficiently reduced.

FIG. 1 is an external view showing an embodiment of a generator to which a muffler device of the present invention is applied. It is a front view of a muffler device of this embodiment. It is a rear view of the muffler device of this embodiment. It is a front view which shows the 1st partition member of this embodiment. It is a front view which shows the 2nd partition member of this embodiment. It is a sectional view of a muffler device of this embodiment. It is a side view of the 1st and 2nd partition member of this embodiment. It is sectional drawing in the AA of FIG. It is sectional drawing in the BB line of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing the appearance of a portable generator to which a muffler device according to the present invention is applied.
As shown in FIG. 1, the generator 1 is provided with a substantially rectangular housing 10, and an engine (not shown) and a muffler device 20 (see FIG. 2) are provided in the lower part inside the housing 10. It is housed. And, by driving the engine, power generation is possible via the alternator.

Further, on one side surface of the housing 10, a control panel 13 in which a power outlet 11 and operation buttons 12 are disposed is mounted.
Furthermore, a handle 15 is provided on the upper surface of the housing 10, and a plurality of legs 16 for supporting the housing 10 are attached to the lower surface of the housing 10.

Next, the muffler device will be described.
FIG. 2 is a front view of the muffler device. FIG. 3 is a rear view of the muffler device. FIG. 4 is a front view showing the first partition member. FIG. 5 is a front view showing a second partition member. FIG. 6 is a cross-sectional view of the muffler device. FIG. 7 is a side view of the first partition member and the second partition member. FIG. 8 is a cross-sectional view taken along line A-A of FIG. FIG. 9 is a cross-sectional view taken along line B-B of FIG.

As shown in FIGS. 2 and 3, the muffler device 20 includes a casing 21. The casing 21 is formed in an oval shape in a plan view and has a flat shape in the front-rear direction. The casing 21 is provided with a first case member 22 and a second case member 23 which are half-cut.
A flange portion 22 a is formed on the outer periphery of the first case member 22, and a flange portion 23 a is formed on the outer periphery of the second case member 23. Then, by joining the flange portion 22 a of the first case member 22 and the flange portion 23 a of the second case member 23, the casing 21 is configured. In the present embodiment, the casing 21 is installed vertically.

At the upper side of the first case member 22, a first inclined surface 24a is formed, the upper surface of which is inclined downward toward the side. At the upper center of the first case member 22, a second inclined surface 24b is formed, the upper surface of which is inclined downward toward the front.
An exhaust hole 25 for connecting an exhaust pipe (not shown) is formed in the first inclined surface 24 a of the first case member 22, and a tail pipe (generally at the center of the second inclined surface 24 b) Tail pipe holes 26 are formed respectively for connecting (not shown).
In the present embodiment, by connecting the exhaust pipe to the first inclined surface 24 a of the casing 21, it is possible to apply engine cooling air to the exhaust pipe, thereby reducing the temperature of the exhaust gas of the engine flowing through the exhaust pipe. It becomes possible.
A mounting flange 27 is formed on the lower surface of the casing 21 so as to project downward.

As shown in FIGS. 4 to 9, the first partition member 30 and the second partition member 31 are accommodated in the casing 21. The first partition member 30 and the second partition member 31 are joined to each other, and in a state where the first partition member 30 and the second partition member 31 are joined to each other, the first case member 22 and the second case member 23 It is held by and supported by
The inside of the casing 21 is partitioned by the first partition member 30 and the second partition member 31 into a first chamber 32 on the first case member 22 side and a second chamber 33 on the second case member 23 side.

The first partition member 30 is formed with a slightly inclined first spiral bulging portion 40 extending in the vertical direction. A substantially rectangular first exhaust bulging portion 41 is formed on the top of the first spiral bulging portion 40. An exhaust pipe 42 connected to the tail pipe hole 26 of the first case member 22 is formed in the first exhaust bulging portion 41.
Further, a first communicating pipe bulging portion 43 communicating with the upper side of the first spiral bulging portion 40 is formed in the first partition member 30. A plurality of pores 44 a are formed on the side of the first exhaust bulging portion 41 of the first partition member 30.
The first spiral bulging portion 40, the first exhaust bulging portion 41, the first communicating pipe bulging portion 43, and the pores 44a are integrally formed by press processing or the like.

When the second partition member 31 is joined to the first partition member 30, a second spiral bulging portion 45 is formed at a position corresponding to the first spiral bulging portion 40. A second exhaust bulging portion 46 is formed at a position corresponding to the first exhaust bulging portion 41 of the second partition member 31.
Furthermore, a third chamber bulging portion 47 positioned on the side of the second spiral bulging portion 45 is formed in the second partition member 31. The second partition member 31 is formed with a second communication pipe bulging portion 48 that communicates the third chamber bulging portion 47 and the upper portion of the second spiral bulging portion 45. A plurality of pores 44 b are formed in the second partition member 31 at positions corresponding to the pores 44 a of the first partition member 30, and a plurality of pores are formed below the third chamber bulging portion 47. 49 are formed.
The second spiral bulging portion 45, the second exhaust bulging portion 46, the third chamber bulging portion 47, the second communicating pipe bulging portion 48, the pores 44b and the pores 49 are integrally formed by pressing or the like. Is formed.

  In the state where the first partition member 30 and the second partition member 31 are joined, as shown in FIG. 8, the third chamber 34 is formed by the first partition member 30 and the third chamber bulging portion 47. In addition, a spiral pipe 57 is formed at a location where the first spiral bulging portion 40 and the second spiral bulging portion 45 are joined. An exhaust portion 58 is formed at a location where the first exhaust bulging portion 41 and the second exhaust bulging portion 46 are joined. A communication pipe 59 communicating the third chamber 34 with the upper portion of the spiral pipe 57 is formed at a location where the first communication pipe bulging portion 43 and the second communication pipe bulging portion 48 are joined.

An arrester 55 is disposed inside the exhaust pipe 42.
In the present embodiment, since the arrester 55 is disposed inside the exhaust pipe 42, downsizing can be achieved while maintaining the muffling function.

A diffuser pipe 50 is provided inside the spiral pipe 57 formed by the first spiral bulging portion 40 and the second spiral bulging portion 45. The diffuser pipe 50 is composed of an outer cylinder 51 and an inner cylinder 52, and in the outer cylinder 51 and the inner cylinder 52, a large number of pores 53 formed by punching are formed. The outer cylinder 51 and the inner cylinder 52 are integrally formed by welding etc. in the upper and lower sides. Glass wool 56 as a sound deadening material is accommodated between the outer cylinder 51 and the inner cylinder 52.
In the present embodiment, by disposing the spiral pipe 57 and the diffuser pipe 50 at an angle, the internal space of the casing 21 can be effectively utilized, and in the limited internal space of the casing 21, the spiral pipe 57 and the spiral pipe 57 can be used. The length of the diffuser pipe 50 can be secured large, and the flow path length of the exhaust gas can be doubled.

With this configuration, the exhaust gas flows from the exhaust hole 25 into the first chamber 32 and flows into the second chamber 33 through the pores 44a and 44b, and then the pores 49 to the third chamber 34. Flow into The exhaust gas flowing into the third chamber 34 flows to the upper portion of the spiral pipe 57 through the communication pipe 59, and is guided through the spiral pipe 57 to the lower portion of the diffuser pipe 50.
At this time, the exhaust gas that has flowed into the spiral pipe 57 contacts the glass wool 56 through the fine holes 53 of the outer cylinder 51, and the exhaust noise is reduced.
Further, the exhaust gas guided to the lower part of the diffuser pipe 50 flows into the inside of the inner cylinder 52 from the lower part of the diffuser pipe 50, flows out from the inner cylinder 52 through the pores 53, and flows into the inside of the outer cylinder 51 As well as being in contact with 56, it flows into the inside of the inner cylinder 52 again through the pores 53. By repeating this, air flow noise and vibration noise can be reduced.

The muffler device 20 of the present embodiment is attached to the generator 1 by, for example, screwing the mounting flange 27 to the crankcase of the engine and screwing the exhaust pipe to the exhaust hole 25.
Then, the muffler device 20 can be easily removed simply by removing the screws. As a result, maintenance of the muffler device 20 can be easily performed.

Next, the operation of the muffler device 20 configured as described above will be described.
Exhaust gas generated from the engine first flows into the first chamber 32 of the casing 21 through the exhaust hole 25 through the exhaust pipe. At this time, by connecting the exhaust pipe to the first inclined surface 24 a of the first case member 22, exhaust gas can be supplied to the casing 21 in a state where the temperature of the exhaust gas is lowered by effectively utilizing the cooling air of the engine. It can be made to flow.

The exhaust gas flowing into the first chamber 32 flows into the second chamber 33 through the pores 44 a and 44 b, and flows into the third chamber 34 from the second chamber 33 through the pores 49.
The exhaust gas having flowed into the third chamber 34 is guided to the upper side of the spiral pipe 57 via the communication pipe 59, and is guided to the lower part of the diffuser pipe 50 through the spiral pipe 57. At this time, the exhaust gas that has flowed into the spiral pipe 57 contacts the glass wool 56 through the fine holes 53 of the outer cylinder 51, and the exhaust noise is reduced.
Further, the exhaust gas guided to the lower part of the diffuser pipe 50 flows into the inside of the inner cylinder 52 from the lower part of the diffuser pipe 50, flows out from the inner cylinder 52 through the pores 53, and flows into the inside of the outer cylinder 51 As well as being in contact with 56, it flows into the inside of the inner cylinder 52 again through the pores 53. By repeating this, air flow noise and vibration noise can be reduced.
Thus, in the present embodiment, when the exhaust gas flows through the spiral pipe 57 and the diffuser pipe 50, the exhaust noise can be reduced by contacting the glass wool 56.
Then, the exhaust gas having flowed through the diffuser pipe 50 is discharged from the tail pipe to the outside through the arrester 55.

In this embodiment, the spiral pipe 57 and the third chamber 34 and the like are formed by pressing the first partition member 30 and the second partition member 31. Therefore, the first chamber has a simple structure. While being able to secure the muffler capacity from 32 to the 3rd room 34, sufficient rigidity can be secured.
Further, since the holding structure of the diffuser pipe 50 is formed by the first partition member 30 and the second partition member 31, the diffuser pipe 50 can be attached without using extra parts, and the internal space of the casing 21 can be Effective utilization can be achieved, and noise reduction can be achieved. In addition, the number of welds can be reduced, and the exhaust gas can be easily sealed.

As described above, in the present embodiment, the casing 21 is provided, and the first partition member 30 and the second partition member 31 are provided inside the casing 21, and the first partition member 30 and the second partition member 31 are provided. A diffuser pipe 50 is provided between them, and a spiral pipe 57 for passing exhaust gas before flowing into the diffuser pipe 50 is provided on the outer periphery of the diffuser pipe 50, and the spiral pipe 57 comprises the first partition member 30 and the second partition member 31. It is formed by joining.
Thus, the spiral pipe 57 is formed by the first partition member 30 and the second partition member 31. Therefore, the muffler capacity can be secured with a simple structure, and sufficient rigidity can be secured. Can. In addition, the number of welds can be reduced, and the exhaust gas can be easily sealed. Further, the flow path length of the exhaust gas can be doubled by the spiral pipe 57, and the exhaust noise can be efficiently reduced.

Further, in the present embodiment, the spiral pipe 57 includes a first spiral bulging portion 40 and a second spiral bulging portion 45 formed by respectively bulging the first partition member 30 and the second partition member 31 by press processing. Bulging part).
Accordingly, the spiral pipe 57 can be easily formed by the first spiral bulging portion 40 and the second spiral bulging portion 45 only by pressing the first partition member 30 and the second partition member 31.

Further, in the present embodiment, the diffuser pipe 50 is held by the first spiral bulging portion 40 and the second spiral bulging portion 45 of the first partition member 30 and the second partition member 31.
Thereby, since the diffuser pipe 50 is held by the first partition member 30 and the second partition member 31, the diffuser pipe 50 can be attached without using extra parts, and the effective use of the internal space of the casing 21 Noise reduction can be achieved. In addition, the number of welds can be reduced, and the exhaust gas can be easily sealed.

Further, in the present embodiment, the diffuser pipe 50 is composed of the outer cylinder 51 and the inner cylinder 52 disposed inside the outer cylinder 51, and the glass wool 56 ( Sound deadening material) is accommodated.
Thus, the exhaust noise flowing through the diffuser pipe 50 can be efficiently reduced by the glass wool 56.

Further, in the present embodiment, the diffuser pipe 50 is disposed extending substantially over the entire region in the vertical direction of the casing 21, and the exhaust gas flows from the upper portion to the lower portion of the spiral pipe 57. It flows from the bottom.
Thus, the flow path length of the exhaust gas can be doubled, and exhaust noise can be efficiently reduced by the spiral pipe 57 and the diffuser pipe 50.

Further, in the present embodiment, the outer cylinder 51 includes the fine holes 53 communicating with the spiral pipe 57, and the inner cylinder 52 includes the small holes 53 communicating with the outer cylinder 51.
As a result, exhaust gas flows between the spiral pipe 57 and the outer cylinder 51 and between the outer cylinder 51 and the inner cylinder 52 through the fine holes 53, whereby exhaust noise can be reduced.

  In addition, this invention is not limited to what is described in the said embodiment, In the range which does not deviate from the meaning of this invention, a various deformation | transformation and change are possible.

DESCRIPTION OF SYMBOLS 1 Generator 10 Housing | casing 20 Muffler apparatus 21 Casing 22 1st case member 23 2nd case member 24a 1st inclined surface 24b 2nd inclined surface 25 hole for exhaust 26 hole for tail pipe 27 flange for attachment 30 1st partition member 31 Second partition member 32 first chamber 33 second chamber 34 third chamber 40 first spiral bulging portion 40 first cover member 41 first exhaust bulging portion 42 exhaust pipe 43 first communicating pipe bulging portion 44a, 44b pore 45 second spiral bulging portion 46 second exhaust bulging portion 47 third chamber bulging portion 48 second communicating pipe bulging portion 49 pore 50 diffuser pipe 51 outer cylinder 52 inner cylinder 53 pore 55 Alester 56 Glass wool 57 Spiral pipe 58 Exhaust part 59 Connecting pipe 61 Exhaust pipe

Claims (6)

In the portable generator muffler device,
A casing is provided, and a first partition member and a second partition member are provided inside the casing,
A diffuser pipe is provided between the first partition member and the second partition member, and a spiral pipe for passing exhaust gas before flowing into the diffuser pipe is provided on the outer periphery of the diffuser pipe.
The muffler device is characterized in that the spiral pipe is formed by joining the first partition member and the second partition member.   2. The muffler device according to claim 1, wherein the spiral pipe is formed by a spiral bulging portion formed by respectively expanding the first partition member and the second partition member by press processing.   The muffler device according to claim 1, wherein the diffuser pipe is held by a spiral bulging portion of the first partition member and the second partition member.   The diffuser pipe is composed of an outer cylinder and an inner cylinder disposed inside the outer cylinder, and a sound deadening material is accommodated between the outer cylinder and the inner cylinder. The muffler device according to any one of claims 1 to 3.   The diffuser pipe is disposed so as to extend over substantially the entire vertical direction of the casing, and the exhaust gas flows from the upper portion to the lower portion of the spiral pipe and flows in from the lower portion of the diffuser pipe. The muffler device according to any one of claims 1 to 4, characterized in that:   The muffler device according to claim 4 or 5, wherein the outer cylinder includes a pore communicating with the spiral pipe, and the inner cylinder includes a pore communicating with the outer cylinder. .

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