JP2003214148A - Exhaust silencer for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide, at low cost, an exhaust silencer for vehicle in which an air pollutant included in an exhaust gas of the vehicle is further reduced, and maintenance is easily carried out. <P>SOLUTION: In this exhaust silencer for vehicle, a silencer body 3 having an exhaust inflow part 1 and an exhaust discharge part 2 is provided, and a plurality of filter members 4 capable of adsorbing a water droplet are arranged to an inside space of the silencer body 3 to form an exhaust gas flow passage of meandering shape. A water spraying part 5 is provided at an upstream side of each of the filter members 4, and a water droplet receiving part 10 for collecting the water droplet condensed inside the silencer body 3 is provided at a lower part of the silencer body 3. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an exhaust muffler for automobiles. Such an exhaust muffler for an automobile usually includes a muffler body formed in a tubular shape, has an exhaust gas inflow portion and an exhaust gas exhaust portion at both ends, receives exhaust gas from the exhaust gas inflow portion, and exhausts the exhaust gas. It plays a role of reducing sound or lowering the temperature of exhaust gas.

[0002]

2. Description of the Related Art In recent years, with the development of industrial and economic systems and the development of highway networks, the number of various vehicles has increased dramatically, and environmental damage caused by exhaust gas emitted from vehicles has become a problem. Environmental standards are set by the Air Pollution Control Law. Conventionally, as an exhaust muffler for an automobile of this type, a plurality of metal plates are arranged in an internal space of the muffler body so as to form an exhaust gas passage in a meandering manner. Under such circumstances, in order to satisfy various emission regulations, an exhaust system for automobiles is equipped with a dust removal filter to reduce the amount of dust released into the atmosphere, and further, a denitration catalyst is installed in the filter. Attempts have been made to detoxify air pollutants such as NOx and SOx released into the atmosphere. Further, regarding the sulfur dioxide and the like among the above-mentioned air pollutants, an exhaust gas purifying apparatus using a platinum catalyst is efficiently used.

[0003]

However, even if sulfur dioxide and the like in exhaust gas can be removed, for example, nitrogen composed of nitrogen monoxide, nitrogen dioxide and the like, which is mostly contained in exhaust gas of diesel engine automobiles, is used. Oxides, benzene soluble substances, which are combustion ash of gasoline and light oil, which generate black smoke, particulate matter such as heavy metals such as vanadium, sulfate ions, and nitrate ions, have not been obtained very effectively. Nitrogen oxides and nitric acid obtained by changing them in the air are extremely harmful to living organisms, and particulate matter also has a great influence on meteorological phenomena. Further, since the exhaust gas purifying apparatus described above is bulky because it is necessary to secure a catalyst area and the like, even if it is attached to an existing vehicle, it cannot always be easily attached to the muffler of the existing vehicle. Moreover, the above-mentioned exhaust gas purifying device needs to be replaced periodically, but it is very expensive and cannot be easily obliged to equip all vehicles with equipment. ing.

Therefore, in view of the above situation, an object of the present invention is to provide an exhaust muffler for an automobile, which can reduce the air pollutants contained in the exhaust gas of the automobile, and which is easy to maintain and inexpensive. It is in.

[0005]

To achieve this object, a characteristic structure of an exhaust muffler for an automobile of the present invention is an exhaust muffler for an automobile having a muffler body having an exhaust inflow portion and an exhaust exhaust portion. In the inner space of the muffler body, a plurality of filter materials capable of adsorbing water droplets are provided to meander the exhaust gas flow passage, and a water spray portion is provided on the upstream side of the filter material, and the muffler body is provided with a lower portion at a lower portion thereof. The point is that a water drop receiver is provided to collect water drops condensed inside the muffler body. Further, the muffler body is provided with a filter material mounting portion that allows the filter material to be inserted and removed from the outside of the muffler body, and the filter material is inserted into the muffler body while being disposed. It is preferable that a fixing portion for attaching and fixing to the mounting portion is provided, and the filter material is located on the downstream side of the muffler body toward the inner side end portion with respect to the muffler body, and the upstream side toward the base end portion on the fixing portion side. It is preferable that they are arranged in an inclined posture located at. Further, it is preferable that a heating mechanism for heating the water sprayed from the water spray section is provided.

[Operation and Effect] That is, when exhaust gas from an internal combustion engine is supplied to an automobile exhaust muffler having a muffler body having an exhaust inflow portion and an exhaust exhaust portion, the exhaust gas is discharged from the exhaust inflow portion. While flowing into the muffler body, it flows so as to be discharged from the exhaust discharge part. At this time, if a plurality of filter materials are provided in the internal space of the muffler main body and the exhaust gas flow passage is formed in a meandering manner, the exhaust gas flowing inside the muffler main body is disturbed by the filter material and meanders the exhaust gas. It flows through the flow passage and comes into contact with the filter material. The exhaust gas that has come into contact with the filter material passes through the filter material, or changes the flow path while colliding with the filter material by centrifugal force a particle component having a large specific gravity, such as soot dust, and gradually moving toward the exhaust gas discharge portion. move on. Therefore, particle components that cannot pass through the filter material are captured by the filter material, so that the exhaust gas discharged from the exhaust gas exhaust portion is removed and purified.

On the other hand, since the water spray portion is provided on the upstream side of the filter material, the exhaust gas passes through the exhaust gas flow passage in a state of containing water. Then, since the particulate component such as the soot dust contains water and has a larger specific gravity and particle diameter, it becomes more susceptible to centrifugal force when the exhaust gas meanders, and is more likely to be collided with the filter material. It becomes difficult for the material to pass through and is easily captured. Moreover, since the filter material is capable of adsorbing water droplets, the solid component integrated with the water droplets due to the supply of water is favorably adsorbed through the water droplets, and it is possible to efficiently remove the particle component. Become.

Of the air pollutants such as NOx and SOx in the exhaust gas, for example, components such as SO ₂ , SO ₃ and NO ₂ are dissolved in the supplied water, so that the particle components and the filter material are used. It is dissolved in water droplets adhering to and is captured by the filter material. As a result, air pollutants that have been conventionally discharged without being removed from the exhaust gas have been removed by the filter.

Further, the particulate components adsorbed and removed by the filter material and the air pollutants such as NOx are easily condensed and easily flow downward together with water droplets having a large diameter. Therefore, a water drop receiver for collecting water drops condensed inside the muffler body is provided in the lower part of the muffler body. As a result, the water droplets and the particle components in the exhaust gas are stored in the water droplet receiving portion with time, and the filter material functions stably and effectively. Therefore, the exhaust gas purification effect is maintained high. In addition, the water drop receiving portion,
Accumulated water and particle components can be stored by using a removable tray that allows the stored water to be discharged freely, or by providing a drainage mechanism such as a drainage port on the water drop receiver that can be opened and closed. Can be configured for easy disposal.

Accordingly, the water sprayed inside the muffler body can effectively collect the air pollutants collected from the exhaust gas in the water drop receiving portion, and further improve the degree of purification of the exhaust gas discharged. It has become possible to raise it.

Further, as described in claim 2, if the muffler body is provided with a filter material mounting portion for inserting and removing the filter material from the outside of the muffler body, the filter material is deteriorated. Even in that case, only the filter material can be replaced instead of replacing the entire muffler. Further, since the filter material can be inserted and removed from the outside, only the filter material can be easily replaced when replacing the filter material without disassembling the muffler to the inside. As a result, the maintenance cost of the vehicle exhaust muffler can be kept low.
Further, when the filter material is inserted and arranged in the muffler body and a fixing portion for fixing the filter material to the filter material mounting portion is provided, the filter material inserted and arranged in the muffler body can be easily and securely arranged. Since it can be fixed to and can be easily replaced, the maintenance workability of the above-mentioned automobile exhaust muffler can be improved.

According to a third aspect of the present invention, the inclination of the filter material is such that the inner side end portion with respect to the muffler body is located on the downstream side of the muffler body and the base end portion on the fixed portion side is located on the upstream side. When arranged in a posture, the exhaust gas flow passage is formed so that the exhaust gas flows along the surface of the filter material while meandering, so that while suppressing the increase in flow resistance of the exhaust gas, The exhaust gas can be efficiently contacted. Further, the area per filter material can be increased as compared with the case where the filter material is provided so as to go straight in the direction from the upstream side to the downstream side of the muffler body. The contact efficiency between the exhaust gas and the exhaust gas can be further increased.

If a heating mechanism for heating the water sprayed from the water spray section is provided, the water sprayed in the muffler body can be turned into steam. Since both the exhaust gas and the water vapor can be mixed in a gaseous state, the mixing becomes easier and the water easily condenses with respect to the particle components. Also, due to the condensation of water,
Since the state of gas-liquid changes, the volume of gas in the exhaust / exhaust part becomes smaller than the volume of gas on the exhaust inflow side of the muffler body, and the flow velocity of exhaust gas inside the muffler body is It sharply drops from the inlet side toward the exhaust outlet side. Then, the particle component that has been flown in the air stream of the exhaust gas easily falls due to gravity, and is less likely to be discharged to the outside of the muffler body.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. The exhaust muffler for an automobile of the present invention comprises a muffler body having an exhaust inflow portion 1 for receiving exhaust gas from an internal combustion engine mounted on an automobile and an exhaust exhaust portion 2 for silencing the exhaust gas and discharging the exhaust gas to the outside. There is.

A plurality of filter materials 4 are provided in the internal space of the muffler body 3 to form an exhaust gas passage in a meandering manner. The filter material 4 is made of, for example, a non-woven fabric 41 formed of a hydrophilic organic fiber material in a sheet shape, and a metallic frame is provided at the peripheral edge of the non-woven fabric 41 to form a plate shape. As a result, while passing the exhaust gas from one surface to the other surface of the nonwoven fabric 41, it is possible to remove the particle components from the exhaust gas and easily adsorb water droplets.

Further, the muffler body 3 is provided with a slit 31 through which the filter material 4 can be inserted and removed from the outside of the muffler body 3, so that the filter material 4 can be attached to or replaced with the muffler body 3. A filter material mounting portion 42 is formed. Further, a fixing portion for fixing the filter material 4 to the filter material mounting portion 42 with a screw or the like in a state where the filter material 4 is inserted and arranged in the filter material 4 and the muffler body 3. Four
3 is provided. In addition, the filter member 4 attached in this manner is located closer to the inner end 44 of the muffler body 3 on the downstream side of the muffler body 3, and closer to the base end 45 of the fixed portion 43 on the upstream side. The exhaust gas is arranged in an inclined posture so that the flowing exhaust gas flows along the surface of the filter material 4, and the contact efficiency between the filter material 4 and the exhaust gas is improved.

In the vicinity of the exhaust gas inflow portion 1, the filter material 4
A water spray unit 5 is provided on the upstream side of. A pair of the water spray portions 5 are provided on both sides of the exhaust inflow portion 1 and slightly above, and water supplied from a water tank 6 provided outside the muffler body 3 is heated by a heating mechanism such as a built-in electric heating coil. A nozzle portion 8 for heating and spraying by 7 is provided. The direction of the nozzle portion 8 is substantially along the flow of the exhaust gas flowing from the exhaust gas inflow portion 1, and water is sprayed in a direction that easily merges with the flow of the exhaust gas. Further, the exhaust inflow portion 1 is provided with a throttle portion 9 to increase the flow velocity of the exhaust gas flowing into the muffler main body 3 to improve the straightness of the exhaust gas and facilitate mixing of sprayed water.

At the lower part of the muffler body 3, a water drop receiving portion 1 for collecting water drops condensed inside the muffler body 3.
0 is set. The water drop receiving portion 10 is provided with a plurality of through holes 101 in the muffler body 3, and a stock tray 102 is provided below the through holes 101 to receive and store water drops flowing downward through the through holes 101, The muffler body 3 and the stock tray 10
The space between the two is hermetically sealed so that the exhaust gas does not leak from the through hole 101 through the stock tray 102. Also, the stock tray is the muffler body 3
Since the space volume inside the is not narrowed, the exhaust gas purification effect described above is not hindered and can be maintained high. Further, the stock tray 102 is detachably attached to the muffler body 3 to form a discharge mechanism 103 so that accumulated water and particle components can be drawn and discharged. The muffler body 3 and the stock tray 102 are made of stainless steel having high acid resistance, for example.

[Other Embodiment] Another embodiment will be described below. Although the filter material 4 is formed in a plate shape from the hydrophilic organic fiber material in the above-described embodiment, the invention is not limited to this, and the inorganic fiber material such as glass fiber or metal fiber, or the porous material such as resin foam is used. It may be formed by any method as long as it can absorb water droplets. Further, instead of having the plate-like shape of the filter material 4, it may have a block-like or rod-like shape.
When the exhaust gas containing the environmental pollutant comes into contact with the exhaust gas, the environmental pollutant contained in the exhaust gas can be removed, and the nonwoven fabric 41 is planarly attached to one surface of the plate-like body. Even if it works, it works effectively.

Further, the water to be sprayed does not necessarily have to be heated, and it is possible to simply spray water at room temperature in the form of mist or use ultrasonic waves or the like. Also in the case of heating, various heating means can be used instead of using the heating wire.

The stock tray may also have a structure in which a water receiving tank is simply provided. In such a case, as a discharging mechanism, a water draining hole is provided in the water receiving tank, and the water draining hole is provided. It suffices if the valve can be opened and closed.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view of an automobile exhaust muffler of the present invention.

FIG. 2 is a vertical sectional side view of an automobile exhaust muffler of the present invention.

FIG. 3 is an exploded perspective view of an automobile exhaust muffler of the present invention.

[Explanation of symbols]

1 Exhaust inflow part 2 Exhaust exhaust section 3 muffler body 4 Filter material 42 Filter material mounting part 43 Fixed part 5 Water spray section 6 water tank 9 throttle 10 Water drop receiver

Claims (4)

[Claims] 1. An exhaust muffler for an automobile, comprising a muffler body having an exhaust inflow portion and an exhaust exhaust portion, wherein a plurality of filter materials capable of adsorbing water droplets are provided in an internal space of the muffler body, and exhaust gas distribution An exhaust muffler for an automobile, wherein the passage is formed in a meandering shape, a water spray portion is provided on the upstream side of the filter material, and a water droplet receiving portion for collecting water droplets condensed inside the muffler body is provided at a lower portion of the muffler body. 2. The muffler body is provided with a filter material attaching portion that allows the filter material to be inserted and removed from the outside of the muffler body, and the filter material is attached to the muffler body while being disposed. A fixing portion is provided to be fixedly attached to the filter material mounting portion.
Exhaust muffler for automobiles described in. 3. The filter material is located on the downstream side of the muffler body as it is closer to the inner side end of the muffler body,
The exhaust muffler for an automobile according to claim 1, wherein the exhaust muffler for an automobile according to claim 1, wherein the exhaust muffler is arranged in an inclined posture in which a base end portion closer to the fixed portion is located more upstream. 4. The exhaust muffler for an automobile according to claim 1, further comprising a heating mechanism for heating water sprayed from the water spray unit.