KR100702177B1 - Muffler for working vehicle - Google Patents

Abstract

The present invention relates to a heavy-duty engine exhaust gas silencer, comprising: a main muffler having one end connected to an exhaust pipe of an engine and a tail pipe formed at the other end; A secondary muffler installed inside the counterweight and having an inlet and an outlet; Connecting means for connecting the tail pipe and the intake port of the secondary muffler; And one end is connected to the exhaust port of the secondary muffler and the other end provides a heavy-duty engine exhaust gas silencer, characterized in that it comprises a discharge means that is opened to the outside of the counterweight. According to the present invention as described above, the noise canceled by the primary muffler is first offset by the secondary muffler and the noise is absorbed while the exhaust gas passes through a longer path, thereby minimizing the emission noise emitted to the outside of the equipment. Can be.

Muffler, Silencer, Tail Pipe, Counterweight

Description

Heavy Equipment Engine Exhaust Silencers {Muffler for working vehicle}             

1 is a perspective view of a silencer of a heavy equipment engine exhaust gas according to the prior art;

Figure 2 is a partial perspective view of an excavator using a silencer according to the prior art.

3 is a front view of a silencer according to an embodiment of the present invention.

Figure 4 is a side view of the silencer according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

10: main muffler 16: discharge means

11: second muffler 19: noise absorbing device

12: air intake 19a: sound absorption plate

13 exhaust port 19b baffle plate

14: tail pipe 30: counterweight

15a: guide pipe 31: engine room

15b: Coupling

The present invention relates to a heavy-duty engine exhaust gas silencer, and more particularly, to a heavy-duty engine exhaust gas silencer by improving the noise reduction effect by configuring a long path of the tail pipe of the silencer through which the engine exhaust gas passes.

In general, exhaust gases emitted from internal combustion engines, such as heavy equipment and automobiles, are high temperature and high pressure, and if they are released to the outside as they are, they may explode and cause a fire due to rapid gas expansion. To prevent this, an exhaust silencer is used that allows the exhaust gas to expand slowly, lowering the temperature and pressure to reduce exhaust noise, and reducing the back pressure so that it can be discharged with as little output loss as possible.

The muffler is connected to the exhaust manifold of the internal combustion engine via the exhaust pipe. There are many types of silencer structures, but the exhaust gas passes through the noise reduction device inside the silencer, so that the noise is gradually reduced by interference of sound waves, reduction of pressure fluctuations, and decrease of exhaust temperature.

The tail pipe is a pipe formed at the rear of the silencer described above, and refers to a pipe that passes through several noise reduction devices inside the silencer so that exhaust gas having a pressure stabilized is discharged into the air.

1 is a perspective view of a heavy-duty engine exhaust gas silencer according to the prior art, and FIG. 2 is a partial perspective view of an excavator using a silencer according to the prior art.                         

According to Figure 2, the counterweight 20 is installed on the back of the excavator and the engine room 21 in contact with the counterweight 20 is installed in front of the excavator. An engine (not shown) such as an engine or a silencer is installed in the engine room 21, and the tail pipe 3 of the silencer is opened above the engine room 21.

According to FIG. 1, when a gas generated from an engine (not shown) enters the silencer main body 1 through an intake pipe 2, a conventional silencer is installed inside the silencer main body 1 while the exhaust gas is expanded. Noise is attenuated through noise reduction devices such as baffles (not shown) and pipes (not shown). The exhaust gas is attenuated in this way is discharged into the atmosphere through the tail pipe (3), this sound is a noise that can be directly heard by people.

Actually, the exhaust gas discharged from the muffler into the air is a considerable high pressure gas, so when the exhaust gas is discharged into the air at atmospheric pressure through the tail pipe 3, noise is greatly generated. In order to reduce such noise, research has been conducted on the structure and performance improvement of the noise reduction device installed in the muffler main body 1, and the internal structure of the tail pipe 3 is changed using various methods to reduce the noise. Reduction is attempted. However, according to the structure of the conventional silencer, the path through which the exhaust gas actually passes is short and is discharged without being attenuated to a satisfactory level. Therefore, satisfactory improvement of the noise of heavy-duty engine exhaust gas is not achieved, and it is pointed out as a chronic problem.

The present invention has been made to solve the above problems, an object of the present invention is to provide a heavy-duty engine exhaust gas silencer composed of a long length of the tail pipe through which the heavy-duty engine exhaust gas passes to effectively reduce the exhaust noise of the engine To reduce it.

In order to achieve the object as described above, the present invention is to discharge the exhaust gas of the engine to the outside of the equipment through a main muffler connected to the exhaust pipe of the engine and a secondary muffler connected to the main muffler and installed inside the counterweight. To provide a heavy duty engine exhaust silencer.

Heavy-duty engine exhaust gas silencer according to the present invention, one end is connected to the exhaust pipe of the engine and the other end of the main muffler is formed with a tail pipe; A secondary muffler installed inside the counterweight and having an inlet and an outlet; Connecting means for connecting the tail pipe and the intake port of the secondary muffler; And a discharging means connected at one end to the exhaust port of the secondary muffler and at the other end to the outside of the counterweight.

In addition, the discharge means is installed along the groove formed in the counterweight as a pipe, the noise absorbing device and a plurality of through-holes can be formed in the opening of the discharge means opening to the counterweight.                     

In addition, the connection means, the connection pipe is installed along the groove formed in the counterweight; And a coupling connecting the connection pipe and the tail pipe of the main muffler.

According to the silencer of the present invention having the above-described structure, the exhaust gas of the engine is introduced into the main muffler through the exhaust port of the engine and passes through various noise reduction devices installed inside the main muffler. Is attenuated.

The exhaust gas from which the main muffler is attenuated flows through the tail pipe and connecting pipe of the main muffler to the secondary muffler installed inside the counterweight. The exhaust gas introduced into the secondary muffler passes through various noise reduction devices installed inside the secondary muffler, and the secondary noise reduction is performed.

The silencer according to the present invention has a significant noise reduction effect because the exhaust gas passing through the main muffler passes a long path, unlike the short tail pipe of the conventional muffler, and the secondary noise is reduced while passing through the secondary muffler. Occurs.

In addition, the noise absorbing device is installed in the opening of the discharge means is made of glass fiber or other absorbing material so as to absorb the residual noise before the second exhaust attenuated exhaust gas to the outside of the counterweight as described above Effective noise reduction is achieved.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.                     

3 is a front view of the silencer according to an embodiment of the present invention, Figure 4 is a side view of FIG.

As shown, the heavy-duty engine exhaust gas silencer according to the present invention includes a secondary muffler 11 installed inside the main muffler 10 and the counterweight 30.

The intake port 10a of the main muffler 10 is connected to an exhaust port (not shown) of the engine and is installed in the engine room 31 of the excavator together with the engine (not shown). A tail pipe 14 is formed in the main muffler 10 to guide the engine exhaust gas 22 to the counterweight 30 side.

Counterweight 30 is installed on the back of the excavator (not shown), the moment due to lack of weight so that the upper swing (not shown) portion is not inclined forward by the moment due to the load of the working device (not shown) of the excavator As shown in FIG. 3, the secondary muffler 11 is installed in the inner space of the counterweight 30.

According to FIG. 4, the inlet 12 is formed in the secondary muffler 11 in the direction of the main muffler 10, and the exhaust port 13 is formed in the other side thereof. The inlet 12 of the secondary muffler 11 is connected to the tail pipe 14 by a connecting means 15. The connecting means 15 consists of a guide pipe 15a and a coupling 15b. The guide pipe 15a is installed along the guide groove 15c, one end of which is connected to the inlet 12 of the secondary muffler 11 and formed inside the counterweight 40, and the other end of the guide pipe 15a. Opening toward the Coupling 15b is made of a heat-resistant rubber-like material having a heat-resistant and flexible property to firmly and flexibly fix the tail pipe 14 and the guide pipe 15a.

The exhaust port 13 of the secondary muffler 11 is connected to the outside of the counterweight 30 by the discharge means 16. The discharge means 16 is composed of a discharge pipe 16a, and the discharge pipe 16a is bent so that one end thereof is connected to the exhaust port 13 of the secondary muffler 11 to form an approximately right angle upward. It is provided along the guide groove 16b of 30, and the other end is protruded and opened in the upper surface of the counterweight 30, and the opening 16d is formed. A noise absorbing device 19 is installed in the opening 16d of the discharge pipe 16a.

The noise absorbing device 19 includes a noise absorbing plate 19a of glass fiber or other noise absorbing material installed in the direction of the discharge pipe 16a, and a baffle plate 19b of metal material attached to the upper surface thereof. Is done. A plurality of through holes 16e are formed in the pipe wall surface around the opening 16d of the discharge pipe 16a to guide the discharge of the exhaust gas.

An exhaust gas discharge path by the silencer of the present invention having the above structure will be described.

In FIG. 4, the engine exhaust gas 22 discharged to the exhaust port (not shown) of the engine located in the engine room 31 is introduced into the main muffler 10 through the inlet port 10a of the main muffler 10. Primary noise attenuation is achieved while passing through various noise reduction devices (not shown) inside the main muffler 10. The exhaust gas passing through the main muffler 10 flows into the secondary muffler 11 through the tail pipe 14 of the main muffler 10 and the guide pipe 15a on the side of the counterweight 30. The exhaust gas passes through the noise reduction device (not shown) installed inside the secondary muffler 11, and the secondary noise attenuation is performed. The exhaust gas of the secondary muffler 11 is the secondary muffler 11 exhaust port 13. Is discharged to the upper surface of the counterweight 30 through the discharge pipe 16a. Residual noise of the exhaust gas reaching the opening 16d of the exhaust pipe 16a is absorbed by the noise absorbing plate 19a of the noise absorbing device 19 and a part of the exhaust gas is upper surface through the baffle plate 19b. The rest is discharged left and right through the through hole (16e) of the discharge pipe (16a).

The silencer according to the present invention passes through the paths 14, 15a, 11, 16a, and 19 that are exhausted through the main muffler 10, unlike the short tail pipe of the conventional silencer. Secondary noise attenuation occurs as it passes through 11), resulting in a significant noise reduction effect.

In addition, the noise absorbing device 19 is installed in the opening (16d) of the discharge means 16 is made of glass fiber or other absorbing material, as described above, the exhaust gas secondary noise reduction as described above counterweight (30) Effective noise reduction is achieved by absorbing residual noise before final discharge to the outside of the chamber.

Since the coupling 15b is made of a flexible material having heat resistance such as heat-resistant rubber, the coupling 15b is transmitted even if vibration and strong heat of the equipment are transmitted to the connection portion between the main muffler 10 and the secondary muffler 11. Flexible connection by) does not cause breakage or deformation and does not cause the outflow of exhaust gas.

As another preferred embodiment, the silencer according to the present invention may have a structure in which the above-described guide pipe 15a, the discharge pipe 16a, and the secondary muffler 11 are not separately installed.

That is, a space portion (not shown) is formed inside the counterweight 30 to perform the same function instead of the secondary muffler 11, and various noise reduction devices (not shown) are installed inside the space portion. A plurality of guide passages (not shown) may be formed inside the counterweight 30 so that the space portion is connected to the main muffler 10 and the outside, thereby achieving a secondary noise reduction effect of the engine exhaust gas.

As described above, according to the heavy-duty engine exhaust gas silencer according to the present invention, the first offset of the noise from the main muffler is canceled by the secondary muffler, and the exhaust gas is absorbed while passing the longer path. Therefore, the noise emitted to the outside of the equipment can be minimized.

Claims (4)

It is installed inside the engine room, one end is connected to the exhaust pipe of the engine and the other end of the main muffler is formed with a tail pipe; A secondary muffler installed inside the counterweight and having an inlet and an outlet; Connecting means for connecting the tail pipe and the intake port of the secondary muffler; And One end is connected to the exhaust port of the secondary muffler and the other end constitutes a discharge means opening to the outside of the counterweight, The connecting means, A guide pipe installed along a guide groove formed in the counterweight, one end of which is connected to the inlet of the secondary muffler and the other end of which is opened toward the engine room to be connected to the tail pipe; And It comprises a coupling connecting the guide pipe and the tail pipe of the main muffler, The discharge means is installed along a guide groove formed inside the counterweight as a pipe, one end of which is connected to the exhaust port of the secondary muffler, the other end of which forms an opening protruding from an upper surface of the counterweight, The circumference of the pipe wall is composed of a discharge pipe is formed a plurality of through-holes through which exhaust gas is discharged, And a noise absorbing device including a noise absorbing plate and a baffle plate for absorbing the residual noise of the exhaust gas before being discharged to the outside of the counterweight in the opening of the discharge means. delete delete The method of claim 1, The coupling is a heavy-duty engine exhaust gas silencer, characterized in that made of a heat-resistant flexible material.

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