KR0159481B1 - Experimental muffler - Google Patents

Abstract

A semi-cylindrical upper container 31 and a lower container 32 are connected to each other by a coupling means 41 in order to provide a muffler pipe and an expansion chamber of an automobile, T2, ..., Tn) on the inner ceiling (31a) and the bottom surface (32a) of the upper vessel (31) and the lower vessel (32) G2, ..., Gn are arranged between the partition plates T1, T2, ..., Tn at equal intervals in the longitudinal direction of the lower containers 31, 32, B2, ..., Bn) having a plurality of through holes (h1, h2, ..., hn) having different shapes and sizes are formed on the surface of each of the grooves (G1, G2, ..., Gn) H2, ..., Hn, into which various pipes P1, P2, ..., Pn having different diameters and lengths are selectively and horizontally inserted, P2 ... Pn and the hubs H1, H2, ..., Hn for pipe insertion are formed on the respective baffles B1, B2, ..., Bn, S2, ..., Sn and annular locking projections U1, U2, ..., Sn for preventing the pipes P1, P2, ..., Pn from flowing in the axial direction. And Un, respectively.

Description

Silencer for automobile experiment

1 (a), (b), (c) and (d) of FIG. 1 are diagrams for schematically explaining the principle of a general silencer.

FIG. 2 is an exploded perspective view showing a silencer for experimental use of an automobile according to the present invention. FIG.

FIG. 3 is a cross-sectional view showing the experimental silencer of the automobile according to the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

31: upper container 32: lower container

41: coupling means 31a: ceiling

32a: bottom surfaces T1, T2, ... , Tn: diaphragm

G1, G2, ... , Gn: groove h1, h2, ... , hn: through hole

B1, B2, ... , Bn: baffle P1, P2, ... , Pn: pipe

H1, H2, ... , Hn: hubs for pipe insertion K1, K2, ... , Kn: coupling surface

S1, S2, ... , Sn: annular engagement grooves U1, U2, ... , Un: annular stumbling block

31p: upper flange 32p: lower flange

44: bolt 31h, 32h: through hole

46: Nuts

[0001] The present invention relates to a muffler for experimental use of an automobile, and more particularly, to a muffler for various types of mufflers by combining a plurality of baffles of various shapes, an upper and lower container vertically separable from each other, The present invention relates to an experimental prefabricated silencer for an experimental automobile of an automobile.

When the exhaust valve of the automobile engine is opened and the exhaust gas is discharged out of the cylinder, the temperature is about 600 ° C., the pressure is 3 to 5 kg / cm 2, the high frequency sound of about 3-10 thousand cycles occurs, The gas column in the exhaust pipe and the gas column in the cylinder are vibrated to generate a very loud noise, and the ride feeling is very uncomfortable. The exhaust muffler smoothly and simultaneously reduces the vibration of the vibration. This silencer is also called a siren and is generally located at the end of a long exhaust pipe from the exhaust manifold, where it is intended to exhaust the exhaust gas to the atmosphere after passing through the tail pipe.

Further, the silencer can attain the object of noise to some extent even if a partition is installed or the exhaust passage is bent, but the back pressure becomes large.

The silencer is a device which consumes the acoustic energy having the exhaust gas with a low resistance so as to basically be an expansion type (the expansion chamber is put in the middle of the duct) (using the principle of resonance damping) as shown in Fig. 2 (b), and absorption type and interference type as shown in (c) and (d) of Fig.

Such a silencer should be about 0.1 atmospheric pressure at the standard output and not more than about 0.3 atmospheric pressure even at the maximum output, since the small silencer is advantageous for backpressure. In order to satisfy this requirement, the volume of the silencer is increased, The silencer of recent years has a complex structure having the principle of absorption, expansion and resonance as shown in FIG. 2 and FIG. 3 of the accompanying drawings, or a structure having a plurality of small holes in one wall, A resonance box is made of a concentric tube and a sound absorbing material is filled therein. This resonance box has a frequency equal to the frequency of the exhaust pipe, so that the vibration energy is completely absorbed. Sound absorbing materials are heat-resistant fibrous materials. In either case, the main pipe has no obstacles, so backpressure is very low. Also, the tail pipe coming out from the silencer spreads in the tail shape of the crucible, so that a small hole is drilled on the outer surface, the noise effect is further improved.

The principle of the noise by the silencer is that the sound waves entering the silencer are interfered with each other (gradually overlapping each other) and lose their power while reflecting from the wall of the expansion room to the other wall. Therefore, it is preferable to increase the complexity of the inside of the silencer in order to improve the silencer effect. However, when the silencer collides with a part of the reflected sound wave or the expansion gas is throttled, the resistance of the silencer decreases.

Therefore, in order to make the resistance as small as possible and to make the sound louder, we try to combine the functions of reflecting each other into one. Generally, the volume of the muffler is 15 to 20 times as much as the displacement, and the output loss is 5 to 10% depending on the number of revolutions. In addition, it is not so quiet in a sports car, and it is said that an exhaust note (a rhythmical noise) which can feel pleasure by moderately strong heat is required.

Sound absorbing material Glass wool (glass fiber) is widely used for absorbing sound energy, and asbestos, rock wool and the like are also used. They must be able to withstand high temperature and high-speed gas flow, and can not be used unless the sound absorption performance is good. Moreover, because the sound absorbing material is porous, moisture and carbon particles contained in the exhaust gas are blocked for a long time, There is a case where resonance occurs (resonates) with the exhaust gas flow to cause a coupling. In such cases, it is necessary to replace the sound absorbing material.

The above silencer is rarely seen when the performance of the silencer predicted at the time of design and the performance of the silencer measured after manufacturing the silencer are identical to each other and the performance difference is usually large. Therefore, until the finished product Various experiments should be carried out with real objects.

In the case of experimenting with such a real object, a number of silencers having different pipes and expansion chambers are required. Therefore, there is an uneconomical problem that requires a large development cost.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a muffler for an automobile which can form a muffler pipe and an expansion chamber by assembling the muffler.

In order to accomplish the object of the present invention, a semicylindrical upper container and a lower container are formed so as to be separated / opposed to each other by a coupling means, and a plurality of arcuate diaphragms Are arranged at regular intervals along the longitudinal direction of the upper and lower vessels so that grooves are formed between the diaphragms, and various baffles, in which a plurality of through holes having different shapes and sizes are formed on the surface, And a pipe insertion hub in which various pipes having different diameters and lengths are selectively and horizontally inserted is formed in each of the baffles. On the coupling surface formed by coupling the pipe and the pipe insertion hub, An annular engaging groove for preventing the pipe from flowing in the axial direction, And an experimental prefabricated silencer of each formed automobile is provided.

The coupling means is formed with a horizontal upper flange and a lower flange at the lower end portion of the upper container and an upper end portion of the lower container, respectively, and a through hole through which a plurality of bolts are inserted is formed in the upper flange and the lower flange, And the upper flange and the lower flange are engaged with each other by the coupling nut.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a muffler for testing an automobile according to the present invention will be described in detail with reference to the accompanying drawings.

2 and 3 illustrate an embodiment of the assembled silencer for an automobile according to the present invention. As shown in FIG. 2, the semi-cylindrical upper and lower containers 31 and 32 are connected to each other by a coupling means T2, ... are formed on the inner ceiling 31a and the bottom surface 32a of the upper and lower containers 31 and 32, respectively, Tn are arranged at regular intervals in the longitudinal direction of the upper and lower containers 31 and 32 and grooves G1, G2, ..., Gn are formed between the partition plates T1, T2, ..., B2, ..., Bn having a plurality of through holes h1, h2, ..., hn having different shapes and sizes are formed on the surfaces of the grooves G1, G2, ..., Bn. And Gn and pipe insertion hoses H1, H2, ..., P3, P4, P6, ..., Pn having different diameters and lengths are selectively inserted horizontally, Hn are formed on the respective baffles B1 and B2 while the pipes P1, P2, ..., Pn and the hubs H1, H2, ..., Hn for pipe insertion are coupled to each other. S2, ..., Sn for preventing the pipes P1, P2, ..., Pn from flowing in the axial direction are formed on the surfaces K1, K2, ..., Kn and the annular locking projections U1 , U2, ..., Un) are respectively formed.

The joining means 41 is formed by horizontally forming an upper flange 31p and a lower flange 32p on the lower end of the upper container 31 and the upper end of the lower container 32, The through holes 31h and 32h through which the bolts 44 are inserted into the lower flange 32p are formed and the upper flange 31p and the lower flange 31p are connected by the nut 46 screwed to the bolt 44. [ (32p) are coupled to each other.

The diaphragms T1, T2, ..., Tn are cut into a circular arc shape so as to be caught along the outline of the baffles B1, B2, ..., Bn as shown in the drawing, The upper and lower containers 31 and 32 are formed in a semicircular cylindrical shape capable of general experiment, and are formed into a cylindrical shape when they are opposed to each other.

As shown in the drawing, two or three pipe insertion hubs H1, H2, ..., Hn formed in the baffles B1, B2, ..., Bn are most suitable, , H2, ..., Hn may be formed.

The through holes 31h and 32h formed in the baffles B1, B2, ..., and Bn are formed in relatively small sizes.

Hereinafter, the operation and effect according to the embodiment of the present invention will be described.

The baffles B1, B2, ..., and Bn required for the experiment among the various baffles B1, B2, ..., Bn are formed in the diaphragms T1, T2, ..., Tn formed on the bottom surface 32a of the lower container 32, P2, ..., Pn are horizontally inserted into the pipe insertion hubs H1, H2, ..., Hn formed in the baffles B1, B2, ..., Bn after the pipes P1, Formed on the outer circumferential surfaces of the pipes P1, P2, ..., Pn in annular engagement grooves S1, S2, ..., Sn formed on the inner circumferential surfaces of the pipe insertion holes H1, H2, P2, ..., Pn are prevented from moving in the longitudinal direction of the pipe inserting hubs H1, H2, ..., Hn by the engagement of the engaging projections U1, U2, ..., Un.

In the above state, the bolts 44 (44) are attached to the through holes (h1, h2, ..., hn) formed in the upper flange 31p and the lower flange 32p in such a manner that the upper and lower containers 31, And the bolts 44 and the nuts 46 are tightened while screwing the bolts 44 and the bolts 44 under the lower bolt 44. The upper and lower containers 31 and 32 are coupled to each other and can be tested.

Meanwhile, when a sound absorbing material is filled in any one of the inner spaces formed by the upper and lower containers 31 and 32 divided by the baffles B1, B2, ..., Bn, Can be tested.

The volume of the expansion chamber formed in the inner space can be arbitrarily adjusted by adjusting the interval between the upper and lower containers 31 and 32 in the baffle B1, have.

The effects of the present invention as described above are that various experiments can be performed on a single assembly type silencer such as an expansion room volume of a silencer and a position of a pipe where a sound absorbing material is applied or a silencer Therefore, it is possible to reduce the cost of manufacturing various silencers, and it is possible to greatly reduce the development period because the silencers can be manufactured by assembling only the actual product, not the actual product.

Claims (2)

The semi-cylindrical upper container 31 and the lower container 32 are formed so as to be separated from each other by the coupling means 41 and the inner ceiling 31a of the upper container 31 and the lower container 32, T2 and so on in the longitudinal direction of the upper and lower vessels 31 and 32 are arranged at equal intervals on the bottom surface 32a and the divergent plates T1 and T2 ..., hn) having different shapes and sizes are formed on the surface of each of the grooves (G1, G2, ..., Gn) The baffles B1, B2, ..., Bn are selectively inserted into the grooves G1, G2, ..., Gn and the various pipes P1, P2, ..., Pn having different diameters and lengths are selectively B2, ..., Bn are inserted into the baffles B1, B2, ..., Bn, and the pipes P1, P2, ..., Hubs (H1, H2, ..., Hn) S2, ..., Sn for preventing the pipes P1, P2, ..., Pn from flowing in the axial direction and the annular locking projections U1, U2, ..., Un) are respectively formed on the inner surface of the muffler. 2. The apparatus according to claim 1, wherein the joining means (41) forms a horizontal upper flange (31p) and a lower flange (32p) at the lower end of the upper container (31) Through holes 31h and 32h in which a plurality of bolts 44 are inserted into the upper flange 31p and the lower flange 32p are formed in the upper flange 31p and the lower flange 32p by the nut 46 screwed to the bolt 44, (31p) and the lower flange (32p) are engaged with each other while being engaged with each other.