JP6806663B2 - Muffler device - Google Patents

Description

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

Conventionally, a muffler device for silencing an engine has been known.
As such a muffler device, conventionally, for example, a technique has been provided in which an outer plate and a tubular outer shell for supporting each outer plate are provided, and the exhaust noise is reduced by reducing the exhaust energy in the muffler. It is disclosed (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2005-155551

The conventional technique is a technique relating to a muffler device for a vehicle engine. However, a generator that drives an engine and generates power by this driving force is known, and the above-mentioned conventional technique cannot be applied as it is as a muffler device for such a generator.
In particular, a portable generator needs to be equipped with a catalyst device in order to purify NOx, and is also required to be lightweight and compact. Furthermore, it is necessary that the exhaust noise when the engine is driven is also reduced.
The present invention has been made in view of the above points, and provides a muffler device that can be installed in a limited space inside a generator and can efficiently reduce exhaust noise. With the goal.

In order to achieve the above object, the present invention includes a vertically arranged casing in a muffler device of a portable generator , and extends inside the casing over substantially the entire vertical direction of the casing. 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 exhaust gas is guided to the upper part of the spiral pipe inside the casing. A guide cylinder is provided, and the exhaust gas flows from the upper part to the lower part of the spiral pipe and flows in from the lower part of the diffuser pipe .
According to the present invention, the length of the exhaust gas flow path can be doubled by the spiral pipe, and the exhaust noise can be efficiently reduced. In addition, a large flow path for the exhaust gas can be secured, and the exhaust noise can be efficiently reduced by the spiral pipe and the diffuser pipe.

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

In the above configuration, the outer cylinder is provided with pores communicating with the spiral pipe, and the inner cylinder is provided with pores communicating with the outer cylinder.
According to the present invention, exhaust gas can flow between the spiral pipe and the outer cylinder and between the outer cylinder and the inner cylinder through the pores, and the exhaust noise can be reduced.

In the above configuration, the casing is provided with an undercover having a protruding portion formed downward in a central portion, and the diffuser pipe is attached to the undercover while being installed at the protruding portion of the undercover. It is characterized by being installed in.
According to the present invention, the diffuser pipe can be easily attached by simply attaching the undercover with the diffuser pipe installed on the protrusion of the undercover.

According to the present invention, the length of the exhaust gas flow path can be doubled by the spiral pipe, and the exhaust noise can be efficiently reduced.
Further, by providing the outer cylinder of the diffuser pipe with pores communicating with the spiral pipe and providing the inner cylinder with pores communicating with the outer cylinder, the exhaust gas flowing into the spiral pipe passes through the pores of the outer cylinder. Exhaust gas that comes into contact with the sound deadening material is reduced, and the exhaust gas that has flowed into the diffuser pipe flows out from the inner cylinder to the inside of the outer cylinder through the pores and comes into contact with the sound deadening material, reducing the exhaust noise. To. In this way, when the exhaust gas flows through the spiral pipe and when it flows through the diffuser pipe, the exhaust noise can be reduced by coming into contact with the sound deadening material.

It is an external view which shows the embodiment of the generator to which the muffler device of this invention is applied. It is a front view of the muffler device of this embodiment. It is a side view of the muffler device of this embodiment. It is sectional drawing in line AA of FIG. It is sectional drawing in BB line of FIG. FIG. 5 is a cross-sectional view taken along the line CC of FIG. It is a perspective view of a diffuser pipe.

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 the muffler device according to the present invention is applied.
As shown in FIG. 1, the generator 1 includes a substantially rectangular parallelepiped housing 10, and an engine (not shown) and a muffler device 20 (see FIG. 2) are located below the housing 10. It is contained. Then, by driving the engine, it is possible to generate electricity via the alternator.

Further, a control panel 13 on which a power outlet 11 and an operation button 12 are arranged is mounted on one side surface of the housing 10.
Further, 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 side view of the muffler device. FIG. 4 is a cross-sectional view taken along the line AA of FIG. FIG. 5 is a cross-sectional view taken along the line BB of FIG. FIG. 6 is a cross-sectional view taken along the line CC of FIG. FIG. 7 is a perspective view of the diffuser pipe.

As shown in FIGS. 2 to 7, the muffler device 20 includes a casing 21, and 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 formed, for example, by double-winding a plate-shaped member and molding it. In the present embodiment, the casing 21 is installed vertically.
Further, a top cover 22 forming an end cover is attached to the upper part of the casing 21, and an undercover 23 forming the end cover is attached to the lower part of the casing 21.
The upper surface of the top cover 22 is provided with a first inclined surface 24a whose upper surface is inclined downward toward the front, and a second inclined surface whose upper surface is inclined downward toward the side is provided on one side of the upper surface of the top cover 22. An inclined surface 24b is provided. Further, the top cover 22 is formed in a curved surface at the rear, and is formed in a substantially trapezoidal shape in a side view.

An exhaust hole 25 for connecting the exhaust pipe 61 is formed in the second inclined surface 24a of the casing 21, and a tail pipe for connecting the tail pipe 60 is formed substantially in the center of the first inclined surface 24a. Each of the holes 26 is formed.
In the present embodiment, by connecting the exhaust pipe 61 to the inclined surface 24 of the casing 21, the cooling air of the engine can be applied to the exhaust pipe 61, and the temperature of the exhaust gas of the engine flowing through the exhaust pipe 61 is lowered. It becomes possible to make it.

The undercover 23 has a shape in which corners in the front-rear direction are formed in a curved surface shape and a protrusion 28 having a central portion bulging downward is provided, and the undercover 23 is formed in a substantially trapezoidal shape in a side view as a whole. A mounting flange 27 is formed on the lower surface of the undercover 23 so as to project downward.

Inside the casing 21, a first partition wall 30 and a second partition wall 31 arranged at predetermined intervals in the vertical direction are provided, respectively. The inside of the casing 21 is partitioned by the first partition wall 30 and the second partition wall 31 into an upper second chamber 33, an intermediate first chamber 32, and a lower third chamber 34.
Inside the casing 21, a connecting pipe 36 is provided which penetrates the first partition wall 30 and communicates the exhaust hole 25 and the first chamber 32. The first chamber 32 communicates with the exhaust hole 25 via the connecting pipe 36. The first partition wall 30 is provided with a communication hole 35 for communicating the first chamber 32 and the second chamber 33.
In the present embodiment, the exhaust hole 25 and the first chamber 32 are communicated with each other by the connecting pipe 36, but the connecting pipe 36 is omitted and the second chamber 33 in which the exhaust hole 25 is formed is the first chamber 33. It may be used as the chamber 32, and the position and capacity of the first chamber 32 can be changed as appropriate.

Inside the casing 21, a catalyst device 40 that penetrates the first partition wall 30 and the second partition wall 31 and extends in the vertical direction is provided. In the upper part of the catalyst device 40, pores 41 are formed by punching to open in the first chamber 32. In the lower part of the catalyst device 40, pores 42 are formed by punching to open in the third chamber 34.
By arranging the catalyst device 40 in the vertical direction in this way, it is possible to make it difficult for carbon inside the catalyst device 40 to be deposited.

Inside the casing 21, a diffuser pipe 50 is provided that penetrates the first partition wall 30 and the second partition wall 31 and extends over substantially the entire vertical direction. The diffuser pipe 50 is composed of an outer cylinder 51 and an inner cylinder 52, and the outer cylinder 51 and the inner cylinder 52 are formed with pores 53 made of a large number of punches. The outer cylinder 51 and the inner cylinder 52 are integrally formed above and below the outer cylinder 51 by welding or the like. Glass wool 56 as a sound deadening material is housed between the outer cylinder 51 and the inner cylinder 52.

A spiral pipe 57 is provided on the outer circumference of the outer cylinder 51. A spiral exhaust gas flow path is formed on the outer circumference of the outer cylinder 51 by the spiral pipe 57.
A guide cylinder 58 is provided on the outer peripheral side of the spiral pipe 57. The lower part of the guide cylinder 58 is open to the third chamber 34, and the upper part is formed in a tubular shape located in the first chamber 32. A communication hole 59 that communicates with the spiral pipe 57 is formed in the upper part of the guide cylinder 58.
The diffuser pipe 50 can be attached by attaching the undercover 23 to the casing 21 with the lower end thereof installed at the protrusion 28 of the undercover 23.

The exhaust gas flowing into the third chamber 34 is configured to be guided above the spiral pipe 57 by the guide cylinder 58, and guided to the lower part of the diffuser pipe 50 through the spiral pipe 57. At this time, the exhaust gas flowing into the spiral pipe 57 comes into contact with the glass wool 56 through the pores 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, and flows out from the inner cylinder 52 to the inside of the outer cylinder 51 through the pores 53. Again, it flows into the inside of the inner cylinder 52 through the pores 53. By repeating this, airflow noise and vibration noise can be reduced.

A connecting pipe 54 connected to the tail pipe hole 26 is connected to the upper end of the outer cylinder 51, and an arrester 55 is arranged inside the connecting pipe 54.

In the present embodiment, the diffuser pipe 50 is arranged between the connecting pipe 36 and the arrangement position of the catalyst device 40. As a result, the high-temperature exhaust gas flowing from the exhaust pipe 61 into the first chamber 32 flows into the catalyst device 40 via the first chamber 32 and the second chamber 33, so that the exhaust gas from the exhaust pipe 61 flows into the catalyst device. It will be cooled by the time it flows into the 40, and it will be possible to prevent the catalyst device 40 from being deteriorated by the high-temperature exhaust gas.
Further, since the arrester 55 is arranged inside the connecting pipe 54 of the diffuser pipe 50, it is possible to reduce the size while maintaining the muffling function.

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 61 into the exhaust hole 25.
Then, the muffler device 20 can be easily removed only by removing each screw. As a result, maintenance of the muffler device 20 can be easily performed.

Next, the operation of the muffler device 20 configured in this way will be described.
The exhaust gas generated from the engine first flows into the first chamber 32 of the casing 21 via the exhaust hole 25 and the connecting pipe 36 via the exhaust pipe 61. At this time, by connecting the exhaust pipe 61 to the inclined surface 24b of the top cover 22, the exhaust gas is allowed to flow into the casing 21 in a state where the temperature of the exhaust gas is lowered by effectively utilizing the cooling air of the engine. Can be done.

The exhaust gas that has flowed into the first chamber 32 flows into the second chamber 33 through the communication hole, and flows into the catalyst device 40 from the second chamber 33. After passing through the catalyst device 40, the exhaust gas flows into the third chamber 34 through the pores 42.
At this time, since the diffuser pipe 50 is arranged between the communication pipe and the arrangement position of the catalyst device 40, the exhaust gas flowing into the first chamber 32 enters the catalyst device 40 via the second chamber 33. A wide space can be secured, whereby the high-temperature exhaust gas flowing from the exhaust pipe 61 into the first chamber 32 and the second chamber 33 is cooled by the time it flows into the catalyst device 40. As a result, it is possible to prevent the catalyst device 40 from being deteriorated by the high temperature exhaust gas.
Further, since the exhaust gas flows into the catalyst device 40 through the pores 41 of the catalyst device 40, the flow velocity of the exhaust gas can be reduced and the airflow noise can be less likely to be generated.

The exhaust gas flowing into the third chamber 34 from the catalyst device 40 is guided above the spiral pipe 57 by the guide cylinder 58, and is guided to the lower part of the diffuser pipe 50 through the spiral pipe 57. At this time, the exhaust gas flowing into the spiral pipe 57 comes into contact with the glass wool 56 through the pores 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, and flows out from the inner cylinder 52 to the inside of the outer cylinder 51 through the pores 53. Again, it flows into the inside of the inner cylinder 52 through the pores 53. By repeating this, airflow noise and vibration noise can be reduced.
As described above, in the present embodiment, the exhaust noise can be reduced by contacting the glass wool 56 when the exhaust gas flows through the spiral pipe 57 and the diffuser pipe 50, respectively.
Then, the exhaust gas flowing through the diffuser pipe 50 is discharged to the outside from the tail pipe 60 via the arrester 55.

As described above, in the present embodiment, the casing 21 is provided vertically, the diffuser pipe 50 is provided inside the casing 21, and the exhaust gas before flowing into the diffuser pipe 50 is provided on the outer periphery of the diffuser pipe 50. A spiral pipe 57 for passing gas was provided.
As a result, the length of the exhaust gas flow path can be doubled by the spiral pipe 57, and the exhaust noise can be efficiently reduced.

Further, in the present embodiment, the diffuser pipe 50 is composed of an outer cylinder 51 and an inner cylinder 52 arranged inside the outer cylinder 51, and a glass wool 56 (glass wool 56) is used between the outer cylinder 51 and the inner cylinder 52. Sound deadening material) is housed.
As a result, the glass wool 56 can efficiently reduce the exhaust noise flowing through the diffuser pipe 50.

Further, in the present embodiment, the diffuser pipe 50 is arranged so as to extend over substantially the entire vertical direction of the casing 21, and the guide cylinder 58 guides the exhaust gas to the upper part of the spiral pipe 57 inside the casing 21. The structure is such that the exhaust gas flows from the upper part to the lower part of the spiral pipe 57 and flows in from the lower part of the diffuser pipe 50.
As a result, a large flow path of the exhaust gas can be secured, and the 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 is provided with pores 53 communicating with the spiral pipe 57, and the inner cylinder 52 is provided with pores 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 pores 53, whereby the exhaust noise can be reduced.

Further, in the present embodiment, the casing 21 is provided with an undercover 23 having a protruding portion 28 formed downward in the central portion, and the diffuser pipe 50 is installed in the protruding portion 28 of the undercover 23. , It is attached by attaching the undercover 23.
As a result, the diffuser pipe 50 can be easily attached by simply attaching the undercover 23 in a state where the diffuser pipe 50 is installed on the protrusion of the undercover 23.

The present invention is not limited to the one described in the above embodiment, and various modifications and changes can be made without departing from the spirit of the present invention.

1 Generator 10 Housing 20 Muffler device 21 Casing 22 Top cover 23 Undercover 24a 1st inclined surface 24b 2nd inclined surface 25 Exhaust hole 26 Tail pipe hole 28 Protrusion 30 1st partition wall 31 2nd partition wall 32 Room 1 33 Room 2 34 Room 3 35 Communication hole 36 Connecting pipe 40 Catalyzing device 41, 42 Pore 50 Diffuser pipe 51 Outer cylinder 52 Inner cylinder 53 Pore 54 Connecting pipe 55 Arrester 56 Glass wool 57 Spiral pipe 58 Guide pipe 59 Communication hole 60 Tail pipe 61 Exhaust pipe

Claims (4)

In the muffler device of a portable generator
Equipped with a casing that is placed vertically
A diffuser pipe is provided inside the casing so as to extend over substantially the entire vertical direction of the casing .
A spiral pipe for passing exhaust gas before flowing into the diffuser pipe is provided on the outer circumference of the diffuser pipe.
A guide cylinder for guiding the exhaust gas to the upper part of the spiral pipe is provided inside the casing, and the exhaust gas flows from the upper part to the lower part of the spiral pipe and flows in from the lower part of the diffuser pipe. A featured muffler device. A claim characterized in that the diffuser pipe is composed of an outer cylinder and an inner cylinder arranged inside the outer cylinder, and a sound deadening material is housed between the outer cylinder and the inner cylinder. Item 1. The muffler device according to item 1. The muffler according to claim 1 or 2 , wherein the outer cylinder has pores communicating with the spiral pipe, and the inner cylinder has pores communicating with the outer cylinder. apparatus. The casing includes an undercover with a downwardly bulging protrusion in the center.
The muffler device according to claim 3 , wherein the diffuser pipe is attached by attaching the undercover while being installed at a protrusion of the undercover .

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