TWI646255B - Vehicle exhaust pipe and sound insulation method thereof - Google Patents

Abstract

The invention relates to a vehicle exhaust pipe and a sound insulation method thereof, wherein an exhaust inner pipe is arranged in an outer cover body, and the exhaust inner pipe is provided with a plurality of holes corresponding to the outer cover body, and a perfusion space is defined as The outer cover body and a space formed by the first side cover and the exhaust inner tube are arranged; the slurry of the low-density cement particles is mixed with water and stirred, and the slurry is poured into the aforementioned perfusion space; The floating cement in the perfusion space is dry to form a floating cement muffler, and the body of the outer cover is sealed by a second side cover; the low-density floating cement muffler surrounds the exhaust inner tube, thereby generating sound insulation The effect of the vehicle exhaust pipe.

Description

Vehicle exhaust pipe and sound insulation method thereof

The invention relates to a vehicle exhaust pipe, in particular to an exhaust pipe of a fuel vehicle, and uses floating cement as a technical field of sound insulation effect.

Press, the main function of the exhaust pipe is to silence. The general practice is to pass the high-pressure exhaust gas through the wide tail pipe to expand the exhaust gas to reduce the pressure, or use the separator or porous straight-through pipe in the pipe to absorb sound waves and reduce the flow rate. In order to further achieve the muffling effect, fireproof fiberglass cotton is additionally coated outside the porous straight pipe. However, fiberglass cotton is harmful to the human body during the coating process.

8 is the internal structure of the muffler, and the exhaust gas enters from the lower left and exits from the upper right. The middle wall has a plurality of holes 5 for allowing gas to pass from the upper tube 6 to the lower tube 7. Figure 9 is a view of the outer surface of a plurality of holes 5 coated with fiberglass 8 sound absorbing.

In the absence of the use of coated fiberglass, in principle, increasing the length of the straight tube can increase the sound absorption effect. Therefore, the prior study has a straight-through tube using a spiral type. Fig. 10 is an internal spoiler of the "modified exhaust pipe". The spoiler 9 inside can be clearly seen from the exhaust pipe.

However, the above-mentioned "modified exhaust pipe" (without coated glass wool) and the conventional conventional exhaust pipe (with coated fiberglass cotton) were found in the "Anechoic Chamber" test. The muffler effect of the type of exhaust pipe is better in the high frequency region than the conventional exhaust pipe. However, the above-mentioned "improved exhaust pipe" has a noise reduction effect in the low frequency 2 k Hz region, but is worse than the conventional conventional exhaust pipe. Therefore, the aforementioned "improved exhaust pipe" has room for improvement in noise improvement.

Therefore, in view of the problems of the conventional conventional exhaust pipe or the modified exhaust pipe, the inventors of the present invention have deliberately developed a vehicle exhaust pipe and a sound insulation method thereof according to the present invention, and the main object of the present invention is to provide A vehicle exhaust pipe using floating cement as a soundproof body; the secondary object of the present invention is to provide a vehicle exhaust pipe that improves the safety of the manufacturing process without damaging the human body.

In order to achieve the above object, the present invention utilizes the following technical means:

A method for soundproofing a vehicle exhaust pipe according to the present invention includes: a filling space building step, wherein an exhaust inner tube is disposed in an outer cover body, and the exhaust inner tube is provided with a plurality of holes corresponding to the outer cover body, And a perfusion space is defined as a space formed by the outer cover body and a first side cover and an exhaust inner tube; a floating cement infusion step is to take low-density cement particles, and after mixing and mixing with water a slurry, which is then poured into the aforementioned filling space; and a bonding step, after the floating cement in the filling space is dried to form a floating cement muffler, and the second side cover seals the outer casing The body; surrounds the exhaust inner tube by the low-density floating cement muffler, thereby generating a soundproofing vehicle exhaust pipe.

A vehicle exhaust pipe according to the present invention includes: an outer cover body including a body, and a first side cover and a second side cover respectively disposed on two sides of the body; an exhaust inner tube a plurality of holes are provided in the body of the outer cover body; and a floating cement muffler is set as a low-density cement sound insulation body and located between the outer cover body and the exhaust inner tube; and the low-density floating cement The muffler surrounds the exhaust inner tube, thereby producing a soundproofing vehicle exhaust pipe.

The density of the low density cement particles described above is set to be between about 0.2 and 0.49 g/cm ³ .

The outer side end faces of the first side cover and the second side cover respectively extend with a set of nozzles.

The present invention can achieve the following effects by the above technical means:

1. The new type is filled with low-density floating cement between the outer cover body and the inner exhaust pipe, that is, floating cement is used as a soundproof component, and the sound insulation effect is superior to the fiberglass cotton used in the general vehicle exhaust pipe. The spoiler and the floating cement are taken from the recycled environmentally friendly materials, so that the new model has both environmental protection concepts.

2. The new type uses low-density floating cement (also known as lightweight cement) as a sound-insulating element, which replaces the fiber-optic cotton, so the manufacturing process is simple and does not endanger human health.

[this invention]

A‧‧‧A sound insulation method for vehicle exhaust pipes

a, b, c‧ ‧ steps

B‧‧‧Vehicle exhaust pipe

1‧‧‧ outer cover

10‧‧‧ Ontology

100‧‧‧Perfusion space

11‧‧‧First side cover

111‧‧‧ Sockets

12‧‧‧Second side cover

121‧‧‧ Sockets

2‧‧‧Exhaust inner tube

21‧‧‧ holes

3‧‧‧ Floating cement silencer

[知知]

5‧‧‧ holes

6‧‧‧Top tube

7‧‧‧Under the tube

8‧‧‧glass wool

9‧‧‧Spoiled coil

Figure 1 is a flow chart showing the steps of the method for soundproofing the exhaust pipe of the vehicle of the present invention.

Figure 2 is a schematic view showing the internal structure of the exhaust pipe of the vehicle of the present invention.

Fig. 3 is a schematic view showing the perfusion space of the exhaust pipe of the vehicle of the present invention.

Figure 4 is a schematic view showing the perfusion space of the exhaust pipe of the vehicle of the present invention.

Fig. 5 is a spectrum decibel graph of a floating cement sound insulator using a density of 0.4 g/cm ³ for the exhaust pipe of the vehicle of the present invention.

Fig. 6 is a spectrum decibel graph of a floating cement muffler having a density of 0.8 g/cm ³ for the exhaust pipe of the vehicle of the present invention.

Figure 7 is a spectrum decibel plot of a conventional conventional vehicle exhaust pipe without a muffler.

Figure 8 is a schematic diagram showing the internal structure of a conventional conventional vehicle exhaust pipe.

Figure 9 is a schematic view of another internal structure of a conventional conventional vehicle exhaust pipe.

Figure 10: Schematic diagram of the internal structure of a general improved vehicle exhaust pipe.

First, referring to FIG. 1 to FIG. 5, the present invention relates to a sound insulation method A for a vehicle exhaust pipe, which comprises the following steps:

A filling space construction step a is provided with an exhaust inner tube 2 in an outer cover body 1, and the exhaust inner tube 2 is provided with a plurality of holes 21 corresponding to the outer cover body 1, wherein the outer cover body of the general automobile exhaust pipe 1 is an approximate "elliptical cylinder", and the outer casing 1 of the locomotive exhaust pipe is approximately "cylindrical". A perfusion space 100 is defined as a space formed by the outer cover 1 and a first side cover 11 and an inner exhaust pipe 2 disposed therein.

A floating cement infusion step b is taken to take low-density cement particles having a density of about 0.2 to 0.49 g/cm ³ , and the mixed slurry is stirred by adding water, and then the slurry is poured into the aforementioned perfusion space 100. As shown in FIG. 3 and FIG. 4, in particular, the composition and manufacturing method of the low-density cement granules have been disclosed in the domestic invention patent No. 103117287 "cement granulation system and granulation method thereof", therefore, application People will not repeat them here. and

In a step c, after the floating cement in the filling space 100 is dry, a floating cement muffler 3 is formed, and the body 10 of the outer cover 1 is sealed by a second side cover 12.

The sound insulation method A of the vehicle exhaust pipe is constituted by the above steps, and the exhaust gas inner tube 2 is surrounded by the low-density floating cement muffler 3, and the exhaust gas discharged from the vehicle passes through the plurality of holes provided in the exhaust inner tube 2. 21 Entering the floating cement muffler 3, and then generating the effect of shock absorption and noise reduction, to produce a vehicle exhaust pipe with good sound insulation effect.

The vehicle exhaust pipe B of the present invention can be manufactured by the sound insulation method A of the above-described vehicle exhaust pipe, as shown in FIG. 1 to FIG. 5, which includes: an outer cover body 1 including a body 10, and A first side cover 11 and a second side cover 12 are respectively disposed on the two sides of the main body 10. The outer side end faces of the first side cover 11 and the second side cover 12 respectively extend a set of nozzles 111 and a set a nozzle 121; an exhaust inner tube 2, which is provided with a plurality of holes 21 corresponding to the body of the outer cover; and a floating cement muffler 3, which is set as a low-density cement sound insulation body, and has a density of about 0.2 to 0.49 g. Between /cm ^{3 and} between the outer cover body 1 and the exhaust inner tube 2.

The vehicle exhaust pipe B is constituted by the above-mentioned components, and the exhaust gas inner tube 2 is surrounded by a low-density floating cement muffler 3. The exhaust gas discharged from the vehicle enters and floats through a plurality of holes 21 provided in the exhaust inner pipe 2. The cement muffler 3, in turn, produces the effect of damping and noise reduction to produce a vehicle exhaust pipe with good sound insulation.

In addition, the vehicle exhaust pipe B of the present invention not only has a sound absorbing function but also has environmental protection and weight reduction benefits. Referring to FIG. 5, FIG. 6 and FIG. 7, the noise test of the vehicle exhaust pipe B of the present invention at a low frequency (20-2000 Hz) shows that, as shown in FIG. 5, a floating cement of 0.4 g/cm ³ is between the spectrum of 300-1000 Hz, the noise level it produces is between 35db ~ 85db; shown in Figure 6, the cement float of 300-1000 Hz between 0.8g / cm ³ in the spectrum, it produces The noise value is between 37db~100db; as shown in Figure 7, the conventional vehicle exhaust pipe is between 300-1000Hz, and the noise value is between 45db~110db; At a frequency of 300-1000 Hz, the muffler of a floating cement having a density of 0.4 g/cm ³ is significantly lower than the floating cement of 0.8 g/cm ³ in decibels, and is superior to the noise decibel value of a conventional conventional exhaust pipe.

In summary, the present invention relates to a vehicle exhaust pipe and a sound insulation method thereof, and the constituent structures and steps of the embodiments thereof have not been found in various books or publicly used, and the patent application requirements are met. Bureau Mingjian, granting patents as soon as possible, and praying for it; those who need to be clear, the above are the specific examples of the case and the technical principles applied. If the changes made in accordance with the concept of this case, the functional role still produced If it does not exceed the spirit of the manual and the drawings, it shall be submitted to Chen Ming within the scope of this case.

Claims (3)

A sound insulation method for a vehicle exhaust pipe includes: a filling space construction step, wherein an exhaust inner tube is disposed in an outer cover body, and the exhaust inner tube is provided with a plurality of holes corresponding to the outer cover body, and is provided A filling space is defined as a space formed by the outer cover body and a first side cover and an exhaust inner tube; a floating cement infusion step is to take low-density cement particles, and the particle density is set to 0.2~0.49 Between g/cm ³ , the mixed slurry is stirred by adding water, and then the slurry is poured into the above-mentioned perfusion space; and a step of combining, after the floating cement in the perfusion space is dried, a floating cement muffler is formed. Sealing the body of the outer cover body with a second side cover; surrounding the exhaust inner tube by the low-density floating cement sound absorbing body, thereby generating a soundproofing vehicle exhaust pipe, and at a low frequency (20-2000 Hz) The noise experiment, between 300-1000Hz spectrum, produces noise levels between 35db and 85db. The sound insulation method of the vehicle exhaust pipe according to claim 1, wherein the first side cover and the outer end surface of the second side cover respectively extend with a set of nozzles. A vehicle exhaust pipe includes: an outer cover body, comprising a main body, and a first side cover and a second side cover respectively disposed on two sides of the main body, and the first side cover and a second side The outer end faces of the side covers respectively extend with a set of nozzles; an exhaust inner tube is provided with a plurality of holes corresponding to the body of the outer cover body; and a floating cement muffler is set as a low density cement sound insulation body, and the particle density thereof Between 0.2 and 0.49 g/cm ³ , and located between the outer cover body and the exhaust inner tube; surrounding the exhaust inner tube by the low-density floating cement sound-damping body, thereby generating a sound-insulating vehicle Exhaust pipe, and in the low-frequency (20-2000Hz) noise experiment, the spectrum between 300-1000Hz, the noise value generated between 35db~85db.