JPH0874558A - Diffusion muffler - Google Patents

Abstract

PURPOSE: To promote the facilitation of connection in constituting it taken into consideration of the connecting structure of an exhaust inlet pipe leading to an exhaust handling equipment as well as to make a muffler effect realizable too in time of atmospheric blowing off. CONSTITUTION: A tubular case 2 is installed in making a main pipe 5 for exhaust gas induction stand halfway, and a diffusion pipe 10 is installed at the side of this tubular case 2, while a cover body 13 or an exhaust inlet pipe to be connected to the exhaust handling equipment is made so as to be installed in an opening 3 of the tubular case 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a diffusion muffler for silencing exhaust gas and releasing it to the atmosphere in a heat pump air conditioner for driving a compressor by a driving force of an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, a muffler as shown in FIG. 4 is provided to muffle exhaust sound emitted from an internal combustion engine together with exhaust gas. The structure of this muffler is known, and it has a function of gradually reducing the pressure of gas to obtain a sound deadening effect, and the exhaust gas is released into the atmosphere. Further, depending on the installation location, the exhaust gas may be guided to the exhaust treatment facility. In such a case, the exhaust introduction pipe C is inserted into the exhaust pipe B of the muffler A as shown by the chain double-dashed line.

[0003]

Generally, in the muffler A, the muffling effect was not sufficient, and the muffling effect was insufficient in some cases. Further, when introducing the exhaust gas to the exhaust treatment facility for the purpose of purifying the exhaust gas, the exhaust gas introduction pipe C having a large diameter is inserted into the exhaust pipe B, but this is originally not suitable for connection and can be easily connected by an equipment operator. It was desired to make it possible.

Therefore, the present invention provides a diffusion muffler which has a structure considering the connection structure of the exhaust introduction pipe leading to the exhaust treatment facility to facilitate the connection and at the same time has a muffler effect when released to the atmosphere. The purpose is.

[0005]

DISCLOSURE OF THE INVENTION The diffusion muffler according to claim 1 of the present invention has a main pipe connected to the main muffler mounted in the middle of a tubular case provided with the diffusion pipe. The cylindrical case is opened on the side opposite to the main muffler, and an exhaust introduction pipe connected to a lid or an exhaust treatment facility is attached to this opening.

In the diffusion muffler according to claim 2 of the present invention, when the exhaust introducing pipe is attached to the opening of the cylindrical case, the connecting pipe is fitted to the main pipe and the flange thereof is connected to the exhaust introducing pipe and the cylindrical case. It is installed by interposing between them.

In the diffusion muffler according to claim 3 of the present invention, in the diffusion pipe attached to the cylindrical case, the opening of the diffusion pipe inside the cylindrical case and the opening of the main pipe on the discharge port side face each other. I have decided not to do it.

[0008]

Therefore, according to the first aspect of the invention, the muffler effect can be obtained at the time of release to the atmosphere, the exhaust sound can be further suppressed, and the exhaust introduction pipe should be installed in advance when the exhaust gas is guided to the exhaust treatment facility. Therefore, it is easy to mount like the lid.

According to the second aspect of the present invention, when the exhaust introducing pipe is mounted, the connecting pipe is fitted to the main pipe to switch the outflow of the exhaust gas to the diffusion pipe so that the exhaust gas can flow to the exhaust introducing pipe. it can.

According to the third aspect of the invention, when the exhaust gas is released into the atmosphere, the opening on the discharge port side of the main pipe and the inner opening of the cylindrical case of the diffusion pipe do not face each other, and the exhaust gas is exhausted. The gas flows in the cylindrical case and then reaches the diffusion pipe.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, a diffusion muffler 1 is shown, and an example in which exhaust gas is emitted to the atmosphere is shown. The cylindrical case 2 is a bottomed member having an upper opening 3, a flange 4 extending outward in the opening 3, and a main pipe 5 accommodated therein.

The main pipe 5 is inserted from the middle of the bottom of the cylindrical case 2 and fixed to the cylindrical case 2 by welding or the like, and the opening 6 is cut obliquely. The outer end of the cylindrical case of the main pipe 5 is externally fitted and connected to the main pipe 7 having a known structure.

The diffusion pipe 10 is provided at an appropriate position on the side surface of the tubular case 2, and the opening 11 inside the tubular case is
It is configured so as not to face the opening 6 of the main pipe 5.

The lid 13 is a disk-shaped member and has a plurality of holes 14 in the periphery thereof, and the cylindrical case 2 is provided through the holes 14.
The connecting screw 16 is passed through the hole 15 formed in the flange 4 and is screwed with the nut 17 so as to be fastened and attached to the tubular case 2. A space 19 is formed by attaching the lid body 13 to the opening 3 of the tubular case 2.

In the above structure, the exhaust gas flowing out from the main muffler 7 is discharged from the opening 6 into the cylindrical case 2.
It flows into the inner space 19 to reduce the pressure, thereby obtaining a sound deadening effect, flows as shown by the arrow, enters through the opening 11 of the diffusion pipe 10, and is discharged from the diffusion pipe 10 to the atmosphere.

FIGS. 3 and 4 show an example in which the diffusion muffler 1 is used and the exhaust introduction pipe 22 for flowing the exhaust gas to the exhaust treatment facility is attached thereto. The exhaust introducing pipe 22 is a pipe having a flange 23 formed at its end, and a plurality of holes 24 formed around the flange 23.

To connect the exhaust introduction pipe 22, the lid 13 is removed, and then the connecting pipe 26 having the flange 25 is fitted on the main pipe 5. A gasket 27 is provided between the connecting pipe 26 and the tubular case 2.
And a gasket 28 between the flange 25 of the connecting pipe 26 and the flange 4 of the tubular case 2, and further between the flange 25 of the connecting pipe 26 and the flange 23 of the exhaust gas introducing pipe 22. The gasket 29 is interposed and the screw 16 is tightened and fixed.

As a result, the main pipe 5 is connected to the exhaust gas introducing pipe 22 through the connecting pipe 26 with substantially the same diameter and is sent to the exhaust gas treatment facility (not shown). As a result, the exhaust gas can be prevented from decreasing in pressure and can flow out to the exhaust treatment facility.

[0019]

As described above, according to the present invention, when it is used for releasing into the atmosphere, when exhaust gas flows from the main pipe to the space, the pressure is reduced and a sound deadening effect is obtained. Is. Further, if an exhaust gas introducing pipe is connected to the opening of the cylindrical case instead of the lid body, the work of leading to the exhaust gas treatment facility can be easily performed. And, there is no need to remove the diffusion muffler.

At this time, a connecting pipe is fitted and attached to the main pipe and has a substantially same diameter.
Therefore, the pressure of the exhaust gas flowing therein does not decrease, the exhaust introduction pipe can be lengthened, and the fitting of the connecting pipe restricts the flow to the diffusion pipe.

Further, the opening on the discharge side of the main pipe and the opening on the inner side of the cylindrical case of the diffusion pipe do not face each other, and there is an advantage that exhaust gas does not flow directly as a muffler effect.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention in which a diffusion muffler is used to release exhaust gas to the atmosphere.

FIG. 2 is a plan view of the above.

FIG. 3 is a cross-sectional view of an embodiment of the present invention before assembly in a state where an exhaust introduction pipe is connected.

FIG. 4 is a cross-sectional view showing a state in which the above-mentioned exhaust introduction pipe is assembled.

FIG. 5 is a front view of a conventional main muffler.

[Explanation of symbols]

 1 Diffusion Muffler 2 Cylindrical Case 3, 6, 11 Opening 5 Main Pipe 7 Main Muffler 10 Diffusion Pipe 13 Lid 19 Space 22 Exhaust Inlet Pipe 26 Connection Pipe

Claims (3)

[Claims] 1. A main pipe connected to a main muffler is attached in the middle to a cylindrical case provided with a diffusion pipe, and the side of the cylindrical case opposite to the main muffler is opened.
A diffusion muffler equipped with an exhaust introduction pipe connected to a lid or an exhaust treatment facility at this opening. 2. An exhaust gas introducing pipe is attached to an opening of a cylindrical case, a connecting pipe is fitted to the main pipe, and a flange thereof is attached between the exhaust gas introducing pipe and the cylindrical case. The diffusion muffler described. 3. The diffusion pipe attached to the tubular case is attached so that an opening inside the tubular case of the diffusion pipe and an opening on the outlet side of the main pipe do not face each other. Diffusion muffler.