JPS6332894Y2 - - Google Patents

Description

[Detailed explanation of the idea] (b) Industrial use part TECHNICAL FIELD The present invention relates to an improvement in a silencer for an automobile.

(b) Prior art Exhaust gas emitted from automobile engines is
The sound is muffled by a silencer and released into the atmosphere. Since such a muffler is located far from the engine, the temperature of the muffler and the exhaust pipe near the muffler is low for a while after the engine is started. Therefore, during this time, the water vapor contained in the exhaust gas comes into contact with the muffler and the inner wall surface of the exhaust pipe in the vicinity thereof, and condenses into water. After the engine starts, if the temperature of the muffler and the exhaust pipe near it rises due to the heat of the exhaust gas, this type of condensation will no longer occur, and the water that has previously formed due to condensation will evaporate. It is released into the atmosphere along with exhaust gas. However, until then, water generated by condensation will remain inside the muffler.

Generally, the longer water remains inside the muffler, the faster the muffler will corrode and the shorter its lifespan will be. Therefore, it is desirable to remove the water inside the muffler as soon as possible.
For this reason, a silencer as shown in FIG. 1 has been proposed. That is, the muffler 2 shown in FIG. The water accumulated at the bottom of the silencer 2 is sucked up by pressure.

Here, the water at the bottom of the muffler 2 is water generated by condensation on the muffler 2 or the inner wall surface of the exhaust pipe leading to the muffler 2. These waters need to grow into large droplets before they fall to the bottom of the silencer 2, and therefore take a relatively long time. Moreover, even if the water droplets grow into large water droplets, the water droplets flow along the inner wall surface of the muffler to the bottom, leaving a trail of water on the inner wall surface.

In this muffler 2, the water accumulated at the bottom is immediately sucked out by the drainage water suction pipe 3. However, as mentioned above, it takes time for water to accumulate at the bottom of the silencer 2. Further, even if the water accumulated at the bottom of the muffler 2 is sucked out, water droplets still remain attached to the inner wall surface of the muffler 2. Thus, in this method, the inner wall surface of the muffler 2 remains wet with water for a long time, and the inside of the muffler 2 does not dry as quickly as originally expected.

The present invention has been made to solve the problems of the above-mentioned prior art.

(c) Purpose of the invention The purpose of the present invention is to prevent water droplets from adhering to the inner wall surface of the silencer, and to
The water vapor in the exhaust gas is converted into water by adhering to water droplets and stored at the bottom of the muffler, and the water accumulated at the bottom of the muffler is quickly discharged, thereby making it possible to clean the inside of the muffler. The purpose is to allow it to dry quickly.

(d) Structure of the invention According to the invention, the purpose is to provide a cylindrical muffler body whose front and rear ends are closed by a front end plate and a rear end plate, respectively, and at least one separator disposed perpendicularly to the longitudinal direction of the muffler body and partitioning the interior of the muffler body into two or more expansion chambers; and a separator formed between the front end plate and the separator for introducing exhaust gas. At the top, an inlet pipe is inserted into the front end plate and the separator at right angles and extends to the expansion chamber closest to the rear end plate; At the bottom, an outlet pipe is inserted into the rear end plate and the separator at right angles and extends to the expansion chamber closest to the front end plate, and an inlet pipe is provided for communicating between the expansion chambers. An inner pipe is inserted between the outlet pipe and the separator at right angles, and a portion of the separator near the bottom of the muffler body communicates with the expansion chambers. The silencer is provided with a relatively small communication hole, and the inlet pipe has a first pipe that collects water, divides it into fine water droplets, and discharges the water from the inlet pipe.
a shower device and a second shower device, the first shower device being slightly closer to the front end plate than directly above the open end of the inner pipe in the expansion chamber closest to the front end plate. The second shower device is located at a position slightly closer to the rear end plate than directly above the open end of the inner pipe in the expansion chamber closest to the rear end plate, and In the pipe, a circulating water suction pipe extending to near the bottom of the muffler body is attached between the first shower device and the second shower device, and the outlet pipe has a water suction pipe extending to the vicinity of the bottom of the muffler body. This is achieved by a silencer characterized in that it is equipped with a drainage water suction pipe that extends close to the bottom.

(e) Effects of the invention In the silencer of the invention having such a configuration, the following phenomenon occurs. Generally, for a while after the engine is started, the temperature of the exhaust pipe leading from the engine to the muffler is lower than the temperature of the exhaust gas. Therefore,
Water vapor in the exhaust gas comes into contact with the inner wall surface of the exhaust pipe in the exhaust pipe, condenses, and becomes water droplets. These water droplets are swept away by the exhaust gas flow and enter the inlet pipe of the muffler, and fall as a fine shower from the first shower device installed in the middle of the inlet pipe, and are deposited at the bottom of the muffler body. accumulate. The water accumulated at the bottom of the muffler body is sucked up from the circulating water suction pipe, flows through the inlet pipe again, and falls to the bottom of the muffler body as a fine shower from the second shower device. Here, some of the water collected at the bottom of the muffler body is sucked up from the drainage water suction pipe and discharged into the atmosphere through the outlet pipe. However, while the temperature of the exhaust pipe leading to the muffler is low, the amount of water generated by condensation in the exhaust pipe is greater than the amount of water released into the atmosphere. The water level gradually increases.

While the temperature of the exhaust pipe is low, the temperature of the muffler body is also low, so the temperature of the water falling from the first and second shower devices is also low. On the other hand, as mentioned above, the first
The opening end (exit) of the inner pipe is located directly below the second shower device and slightly farther from the front end plate, and the inner pipe is located directly below the second shower device and slightly farther from the rear end plate. There are open ends (inlets), and the exhaust gas flowing into the muffler always passes through these open ends. Therefore,
When the water vapor in the exhaust gas that has not condensed in the exhaust pipe leading to the muffler passes through these open ends,
It comes into contact with low-temperature water droplets falling from the first or second shower device, condenses on the surface of the water droplets, or adheres to the water droplets to become water. In this case, as mentioned above, the falling water droplets are made into fine showers by the shower device, so the contact area between the water droplets and water vapor is large, and therefore, when passing through the exhaust gas shower, the water vapor in the exhaust gas Most of it turns into water. Therefore, no dew condensation occurs on the inner wall surface of the muffler, and the inner wall surface of the muffler does not get wet with water.

After a while after starting the engine, the temperature of the exhaust pipe and the muffler rise to the same level as the temperature of the exhaust gas passing through them. In this case, no condensation will occur in the exhaust pipe, and no water will be supplied from the first shower device to the bottom of the muffler body. Therefore, the water that had previously accumulated at the bottom of the muffler body is simply sucked up from the drainage water suction pipe and released into the atmosphere, and this water quickly disappears. Moreover, the water vapor in the exhaust gas is released into the atmosphere together with the exhaust gas without condensing in the muffler.

In the conventional system shown in Fig. 1, water droplets formed by condensation on the inner wall surface of the muffler must grow large before they fall to the bottom of the muffler body. Therefore, it takes time.

In contrast, in the present invention, as mentioned above, the water vapor in the exhaust gas is attached to the water droplets falling from the first and second shower devices, so water quickly accumulates at the bottom of the silencer body. .

In addition, in the silencer according to the present invention, there is no condensation on the inner wall surface of the silencer, and no water droplets are attached to the inner wall surface from the beginning. , there will be no water inside the silencer.

In other words, in the present invention, even if the water at the bottom of the muffler main body disappears, water droplets will not remain attached to the inner wall surface of the muffler as in the conventional case.

(f) Effects of the invention Thus, according to the invention, the inside of the silencer dries quickly.

(G) Embodiment Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 2 is a longitudinal sectional view of an embodiment of the present invention. In the figure, 7 is an outer cylinder having a circular or elliptical cross section, and 8 and 9 are a front end plate and a rear end plate that close both front and rear ends of the outer cylinder 7, respectively. A muffler main body 10 is formed by the outer cylinder 7, the front end plate 8, and the rear end plate 9. Inside the silencer main body 10, a first separator 14 and a second separator 1 are provided.
5 are arranged perpendicular to the longitudinal direction. The interior of the muffler main body 10 includes these separators 14 and 1.
5 into a first expansion chamber 11, a second expansion chamber 12, and a third expansion chamber 13.
An inlet pipe 16 for introducing exhaust gas is attached to the front end plate 8 and the first and second separators 14 and 15. The inlet pipe 16 has a front end plate 8 and a first and second separator 1.
4 and 15 at right angles thereto, and extends into the third expansion chamber 13. Also,
An outlet pipe 17 for discharging exhaust gas is attached to the rear end plate 9 and the first and second separators 14 and 15. The outlet pipe 17 is fitted below the rear end plate 9 and the first and second separators 14 and 15 at right angles thereto, and extends into the first expansion chamber 11 . An inner pipe 18 is arranged between the inlet pipe 16 and the outlet pipe 17. The inner pipe 18 is connected to the first and second separators 1
4 and 15 at right angles, and its inlet 19 opens into the third expansion chamber 13. Further, the outlet 20 opens into the first expansion chamber 11 . A large number of small holes 21 are bored in the middle of the inner pipe 18 to communicate the inside of the inner pipe 18 and the inside of the second expansion chamber 12 . A relatively small communication hole 22 is bored below the first and second separators 14 and 15. a first expansion chamber 11;
The second expansion chamber 12 and the third expansion chamber 13 are communicated with each other through these communication holes 22 . A first shower device 23 is provided in the middle of the inlet pipe 16 to collect water in the inlet pipe 16, divide it into fine water droplets, and discharge the water from the inlet pipe 16. The first shower device 23 is located slightly closer to the front end plate 8 than directly above the outlet 20 of the inner pipe 18. Details of the first shower device 23 are shown in FIG. As shown in the figure, the first shower device 23 includes a pressure receiving member 24 that protrudes into the inlet pipe 16 and receives the exhaust gas flow, and a water reservoir member 25.
A large number of small holes 26 are bored in the lower surface of the water reservoir member 25. As shown in FIG. 2, the open end 29 of the inlet pipe 16 in the third expansion chamber 13 is located slightly closer to the rear end plate 9 than directly above the inlet 19 of the inner pipe 18. A second shower device 30 is provided at the open end 29 . Further, an air guide member 31 is attached to the open end 29 to direct the flow of exhaust gas downward. Details of the second shower device 30 are shown in FIG. As shown in the figure, the second shower device 30 includes a pressure receiving member 32 that extends over the inlet pipe 16 and is shaped like a bag to receive the exhaust gas flow. A large number of small holes 33 are bored in the pressure receiving member 32 . As shown in FIG. 2, in the inlet pipe 16, between the first shower device 23 and the second shower device 30, there is a circulating water suction pipe 38 that extends to the vicinity of the bottom 37 of the muffler main body 10. installed. The outlet pipe 17 has a silencer main body 1.
A drainage water suction pipe 39 is attached that extends to the vicinity of the bottom 37 of the drain. The muffler 42 shown in FIG. 2 is attached to an exhaust pipe 41 extending from the engine 40, as shown in FIG. 5.

The operation and effects of the above embodiment will be explained. Fifth
As shown in the figure, from the engine 40 to the muffler 4
The length of the exhaust pipe 41 up to the point 2 is long. Therefore, for a while after the engine 40 is started, the temperature of the exhaust pipe 41 is lower than the temperature of the exhaust gas passing therethrough. Therefore, the water vapor in the exhaust gas comes into contact with the inner wall surface of the exhaust pipe 41 in the exhaust pipe 41 and turns into water droplets. Such water droplets are swept away by the exhaust gas stream and enter the inlet pipe 16 of the muffler 42, as shown in FIG. Inlet pipe 16
As shown in FIG. 3, the water droplets 27 that have entered the inlet pipe 16 and have been swept away by the exhaust gas flow are reduced in exhaust gas flow velocity by the pressure receiving member 24 in the first shower device 23, as shown in FIG. In order to do so, it enters the water reservoir member 25. Water reservoir member 2
The water that has entered the muffler body 5 falls as a fine shower 28 through the small holes 26, and accumulates at the bottom 37 of the muffler body 10, as shown in FIG. The water accumulated in the bottom 37 of the muffler body 10 is sucked up from the circulation water suction pipe 38 and flows again through the inlet pipe 16 as shown at 34 by the exhaust gas flow. As shown in FIG. 4, the water droplets 34 flowing through the inlet pipe 16 are reduced in exhaust gas flow velocity by the pressure receiving member 32 in the second shower device 30.
It enters the bag-shaped pressure receiving member 32. The water that has entered the pressure receiving member 32 flows through the shower 3 which is finer than the small holes 33.
It becomes 5 and falls. As shown in the figure, a wind guide member 31 that directs the flow of exhaust gas downward is attached to the open end 29, so that the exhaust gas descends together with the shower 35. Here, as shown in FIG. 2, some of the water accumulated in the bottom 37 of the muffler main body 10 is sucked up from the drainage water suction pipe 39 and passed through the outlet pipe 17 to the outlet pipe 43. released into the atmosphere as shown in However, while the temperature of the exhaust pipe 41 shown in FIG. Therefore, the volume of water at the bottom 37 of the silencer main body 10 shown in FIG. 2 gradually increases.

While the temperature of the exhaust pipe 41 is low, the silencer main body 10
Since the temperature of the first and second shower devices 2 is also low,
The temperature of the falling water is also lower than that of 3.30. On the other hand, as described above, the outlet 20 of the inner pipe 18 is located at a position directly below the first shower device 23 and slightly further from the front end plate 8, and is located slightly further from directly below the second shower device 30. There is an inlet 19 of the inner pipe at a position farther from the end plate 9, and the exhaust gas flowing inside the muffler 42 always passes through the inlet 19 and the outlet 20. Therefore, silencer 4
When the water vapor in the exhaust gas that has not condensed in the exhaust pipe 41 leading to the shower head 2 passes through the inlet 19 and the outlet 20, it is absorbed into the first or second shower device 2.
It comes into contact with the low-temperature water droplets 28, 35 falling from the water droplets 3, 30, and condenses on the surfaces of the water droplets 28, 35, or becomes water by adhering to the water droplets 28, 35. In this case, since the falling water droplets 28 and 35 are turned into fine showers by the shower devices 23 and 30 as described above, the contact area between the water droplets and the water vapor is large, and therefore the exhaust gas passes through the shower. Most of the water vapor in the exhaust gas turns into water. Therefore, even if the temperature of the silencer 42 is low,
There is no condensation on the inner wall surface of the silencer 42, and the silencer 42
The inner wall surface of the wall will not get wet with water.

After a while after the engine 40 is started, the temperature of the exhaust pipe 41 and the temperature of the muffler 42 rise to the same level as the temperature of the exhaust gas passing through them. In this case, no condensation occurs in the exhaust pipe 41, and the first
from the shower device 23 to the bottom 3 of the silencer main body 10
7 will run out of water. Therefore, the water that had previously accumulated in the bottom 37 of the silencer body 10 is simply sucked up from the drainage water suction pipe 39 and released into the atmosphere, and this water quickly disappears. . Moreover, the water vapor in the exhaust gas is not condensed within the muffler 42 and is released into the atmosphere together with the exhaust gas as water vapor.

In the conventional system shown in Fig. 1, the water droplets generated by condensation on the inner wall surface of the silencer need to grow large before they fall to the bottom of the silencer body. ,it takes time.

On the other hand, in the embodiment, as described above,
Since the water vapor in the exhaust gas is attached to the water droplets 28 and 35 falling from the first and second shower devices 23 and 30, water quickly accumulates on the bottom 37 of the muffler body 10.

Furthermore, in the silencer 42 according to this embodiment,
Since there is no condensation on the inner wall surface of the muffler 42 and no water droplets are attached to the inner wall surface from the beginning, in this embodiment, when the water on the bottom 37 of the muffler main body 10 disappears, the inside of the muffler 42 There will be no water at all.

In other words, in this embodiment, as in the conventional case,
Even if the water in the bottom part 37 of the silencer main body 10 runs out,
Still, no water droplets remain attached to the inner wall surface of the silencer 42.

Thus, according to this embodiment, the inside of the silencer 42 is quickly dried.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a conventional silencer, and FIG. 2 is a vertical cross-sectional view of a silencer according to an embodiment of the present invention.
3 is a detailed view of the first shower device in the silencer shown in FIG. 2, FIG. 4 is a detailed view of the second shower device in the silencer shown in FIG. 2, and FIG. 5 is a detailed view of the second shower device in the silencer shown in FIG. FIG. 2 is a side view of a car equipped with a silencer. 7... Outer cylinder, 8... Front end plate, 9... Rear end plate, 1
0... Silencer main body, {11... First expansion chamber, 1
2...Second expansion chamber, 13...Third expansion chamber}
(expansion chamber), 14...first separator, 15...
second separator, 16...inlet pipe,
17... Outlet pipe, 18... Inner pipe, 19... Inner pipe inlet, 20... Inner pipe outlet, 21... Small hole, 22... Communication hole, 23... First shower device, 29... Open end of inlet pipe, 30... Second shower device, 37... Bottom of silencer body, 38... Water suction pipe for circulation, 39... Water suction pipe for drainage, 42... Silencer.

Claims (1)

[Scope of utility model registration request] A cylindrical muffler body whose front and rear ends are respectively closed by a front end plate and a rear end plate; at least one separator that partitions the interior of the interior into two or more expansion chambers; and a separator that is fitted perpendicularly to the front end plate and the separator above the front end plate and the separator for introducing exhaust gas. , an inlet pipe extending to the expansion chamber closest to the rear end plate, and an inlet pipe inserted at right angles to the rear end plate and the separator below the rear end plate and the separator in order to discharge exhaust gas. and an outlet pipe that extends to the expansion chamber closest to the front end plate and is inserted into the separator at right angles between the inlet pipe and the outlet pipe in order to communicate between the expansion chamber and the expansion chamber. and a relatively small communication hole that communicates between the expansion chambers is provided in the separator near the bottom of the silencer main body, The inlet pipe is provided with a first shower device and a second shower device that collect water, divide it into fine water droplets, and discharge the water from the inlet pipe, and the first shower device , the second shower device is located at a position slightly closer to the front end plate than directly above the opening end of the inner pipe in the expansion chamber closest to the front end plate, and the second shower device is located in the expansion chamber closest to the rear end plate. It is provided at a position slightly closer to the rear end plate than directly above the opening end of the inner pipe, and in the inlet pipe, between the first shower device and the second shower device, the A silencer characterized in that a circulation water suction pipe extending to the vicinity of the bottom of the silencer body is attached, and a drainage water suction pipe extending to the vicinity of the bottom of the silencer body is attached to the outlet pipe.