JPH0715246B2 - Exhaust system for work vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is used in a work vehicle such as a dust collecting vehicle that performs a dust throwing operation at the rear of a vehicle body, and is included in exhaust gas that causes air pollution. The present invention relates to an exhaust device that removes graphite and the like.

[Conventional technology]

FIG. 2 shows a conventional example of an exhaust device provided in a work vehicle, for example, a dust collecting vehicle. (1) is a front packing box of the dust collecting vehicle, (2) is a rear packing box, and (3) is an operating box. Seats, (4) front wheels,
(5) shows a rear wheel. An operator inserts dust from the rear into the dust inlet on the rear surface of the rear cargo box (2).
(6) shows an engine, (7) shows an exhaust manifold of each cylinder, (8) shows an exhaust muffler connected to the pipe, and (9) shows an exhaust pipe derived therefrom. In order to collect dust on the left side of the road except on narrow roads, the exhaust pipe (9) is bent to the right in the direction of travel of the vehicle so that its tip is located in front of the rear wheel (5). The exhaust gas from (6) is exhausted from the lower right side of the vehicle body.

[Problems to be Solved by the Invention]

By the way, the exhaust gas discharged from the exhaust pipe (9) in the above exhaust device is not dispersed because it is quickly dispersed and diluted in the atmosphere during traveling, but there is no problem. As a result, the worker often inhales exhaust gas during work, resulting in a problem in health management.

Therefore, at present, a P-type exhaust valve and a rising type exhaust pipe which is raised behind the driver's seat (3) have been proposed and partially put into practical use. However, these exhaust pipes only change the exhaust gas emission position, and although they help improve the working environment of workers during work, the exhaust pipes still contain graphite, which is a harmful component, etc. The problem of air pollution remains because it is discharged through the atmosphere to the atmosphere.

The present invention has been made in view of such a situation, and its purpose is to improve the working environment of the worker who is working and to exhaust the exhaust air of the work vehicle for preventing the air pollution. To provide a device.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention branches the exhaust pipe led out from the exhaust muffler, and opens one of the branch pipes on the lower left side of the vehicle body, and opens it in the middle of traveling,
A tangential inflow type with an on-off valve that closes during operation, and the other branch pipe with a wet collection tank at the bottom that stores a liquid that has the function of collecting and collecting graphite, which is a harmful component contained in exhaust gas, It is connected to a separation device consisting of a cyclone.

[Action]

According to the invention, since the on-off valve is opened during traveling, the exhaust gas discharged from the exhaust muffler to the exhaust pipe mainly flows into one of the branch pipes and is discharged to the lower left side of the vehicle body. On the other hand, at the time of work, since the on-off valve is closed, all the exhaust gas discharged from the exhaust muffler to the exhaust pipe flows into the other branch pipe, and flows into the separation device through the other branch pipe, Here, graphite, which is a harmful component, is separated and removed and discharged into the atmosphere, while graphite, which is a harmful component separated from the exhaust gas, falls due to its own weight and adheres to the liquid stored in the wet collection tank. To be collected.

〔Example〕

The structure of the present invention will be described below with reference to the embodiment shown in FIG. However, in this embodiment, the same parts as those in FIG. 2 are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 1, (10) is an exhaust muffler, (11) is an exhaust pipe derived from the exhaust muffler (10), and is branched into a first branch pipe (12) and a second branch pipe (13) on the way, The first branch pipe (12) is bent to the right in the traveling direction of the vehicle so that its front portion is located in front of the rear wheel (5), and the second branch pipe (13).
Is bent and turned in the traveling direction of the vehicle and is extended between the driver's seat (3) and the front packing box (1), where it is raised almost vertically and its upper end is connected to the separating device (14). I am letting you. A tangential inflow cyclone is used in the separation device (14), and in this type of tangential inflow cyclone, when exhaust gas is blown tangentially from the upper part of the outer cylinder (14a), the exhaust gas is discharged. While swirling along the inner wall surface of the outer cylinder (14a), it flows into the lower conical portion, where it gradually changes to an upward flow at the center, passes through the upper inner cylinder (14b), and passes through the exhaust pipe (14c). As it goes out, graphite, which is a harmful component contained in the exhaust gas, collides with the inner wall surface of the outer cylinder (14a) due to a large centrifugal force when it swirls inside, and falls. (15) is a wet collection tank provided below the separator (14), which is connected to the lower end of the outer cylinder (14a) of the separator (14) through a communication pipe (16) and has a predetermined amount inside. , For example, liquid (17) such as water, metalcrine and α (trade name) is stored. (1
Reference numeral 8) is an opening / closing valve provided in the middle of the first branch pipe (12) and is connected to a rotary solenoid (20) which is a power unit via a link (19). Rotary solenoid (20)
Is electrically connected via a wiring (22) to an operation switch (21) such as a loading main switch of a loading device for loading dust disposed in the driver's seat (2) or a changeover switch of a power take-off device of an engine. When connected and the operation switch (21) is turned on, the on-off valve (18) is closed via the link (19), and when the operation switch (21) is turned off, the on-off valve (18) is connected via the link (19). 18) Open.

Next, the flow of exhaust gas during traveling and work in the exhaust device having the above configuration will be described.

First, when the vehicle is traveling, since the operation switch (21) is in the OFF state and the open / close valve (18) is open, the exhaust gas discharged from the exhaust pipe (11) from the exhaust muffler (10) is mainly It flows into the first branch pipe (12) and is discharged from the front end of the first branch pipe (12) to the lower right side of the vehicle body. Even if exhaust gas is exhausted while containing harmful components such as graphite during traveling, there is almost no problem because the exhaust gas is rapidly dispersed and diluted in the atmosphere. On the other hand, the exhaust gas slightly flowing into the second branch pipe (13) flows into the separation device (14) and the separation device (1
While swirling along the inner wall surface of the outer cylinder (14a) in 4), this swirling motion separates graphite, which is a harmful component, into the lower conical portion, where it gradually changes to an upward flow and the upper inner cylinder ( It is discharged into the atmosphere with almost no harmful components such as graphite removed from the discharge pipe (14c) through the inside of 14b). And
The harmful components such as graphite separated from the exhaust gas by the separator (14) enter the wet collection tank (15) from the lower end of the outer cylinder (14a) of the separator (14) through the communication pipe (16) due to its own weight. The liquid drops (17) and adheres to and is collected by the liquid (17) stored in the wet collection tank (15).

Next, at the time of work, since the operation switch (21) is in the ON state and the on-off valve (18) is closed, the exhaust gas discharged from the exhaust muffler (10) to the exhaust pipe (11) is All flow into the second branch pipe (13) and flow into the separator (14) through the second branch pipe (13), where graphite, which is a harmful component, is separated and removed, and then discharged from the discharge pipe (14c) to the atmosphere. Is discharged. Therefore, the exhaust gas discharged during the work contains almost no harmful components such as graphite, which helps improve the working environment of the worker and does not pollute the atmosphere.

〔The invention's effect〕

According to the present invention, the exhaust gas exhausted during work is free from harmful components such as graphite, which is extremely effective for the health of workers by improving the working environment of workers, and reduces air pollution. It can be blocked, and exhaust gas is exhausted to the atmosphere while containing graphite, which is a harmful component, while driving, and only during work, the graphite, which is a harmful component, in exhaust gas is separated and removed. Since it is designed to adhere and collect to the liquid stored inside, it is possible to suppress the consumption of the liquid in the wet collection tank and maintain the function of collecting harmful components such as graphite for a long period of time. It can exhibit excellent properties as an exhaust system for various types of work vehicles.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an exhaust system for a work vehicle according to the present invention. FIG. 2 is a bottom view of a work vehicle equipped with a conventional exhaust device. (10) …… Exhaust muffler, (11) …… Exhaust pipe, (12)…
… First branch pipe, (13) …… Second branch pipe, (14) …… Separator, (15) …… Wet collection tank, (16) …… Communication pipe, (1
7) ... fluid, (18) ... open / close valve, (19) ... link, (20) ... rotary solenoid, (21) ... operation switch.

Claims (1)

[Claims] 1. A graphite, which is a harmful component contained in exhaust gas discharged from an engine, is separated and removed by a separator comprising a tangential flow type cyclone and discharged into the atmosphere, and a graphite, which is a separated harmful component. In the exhaust system of a work vehicle that adheres to and collects the liquid stored in the wet collection tank installed in the lower part of the separation device, the exhaust pipe derived from the exhaust muffler is branched, and one of the branch pipes is connected to the left side of the vehicle body. An exhaust device for a work vehicle, which is provided with an opening / closing valve that opens downward and opens during traveling and closes during work, and connects the other branch pipe to the separating device composed of the tangential inflow cyclone.