JPH04171212A - Particulate trap for diesel engine mounted on operating machine - Google Patents

Abstract

PURPOSE:To simplify the structure of a particulate trap, small and light in weight and capacity by having the exhaust gas guide portion of a casing communicate with the exhaust port of an engine mounted on an operating machine and sealing the draft opening portion with an open/close allowable cap. CONSTITUTION:A particulate trap 1 has a ceramics filter element 5 and a muffling mechanism 6 contained in a casing 4. An exhaust gas guide tube 7 which is guided out of the casing 4 is formed as a T-shaped tube. The branch tube 7a as the leg portion of the T-shaped tube is connected in communication with an exhaust manifold 8 for an engine E, and the straight portion 7b of the T-shaped tube is formed as the draft opening portion 9, which is sealed and blocked with a plate flange 10 in an open/close allowable manner. Carbon particles trapped by the filter element 5 is burned with high-temperature hot air supplied from a hot air generator 15 to recycle the filter element 5. In this way, a particulate trap fittable for the engine mounted on an operating machine is offered in a simple structure.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a particulate trap installed in an exhaust gas discharge path of a diesel engine.

(Prior Art) Exhaust gas emitted from an engine contains carbon or particulates, which may be emitted as sparks. This phenomenon is more noticeable in diesel engines. Therefore, conventionally, a technology has been proposed in which a particulate trap is installed in the exhaust gas exhaust path of an engine to trap carbon particles mixed in the exhaust gas and prevent the carbon particles from being released into the atmosphere. .

Conventional particulate traps were developed for trucks that operate continuously for long periods of time.
There was a condition that particulate traps clogged with carbon particles had to be regenerated while driving. For this reason, conventional particulate traps
The filter element is made of ceramics, and a heater or burner for regenerating the filter element is placed inside the casing, and clogging of the filter element is detected by detecting the difference in exhaust gas pressure before and after the filter element. Alternatively, the filter element is regenerated by operating a burner to burn the carbon particles captured in the filter element.

(Problem to be solved) However, as mentioned above, with conventional particulate traps, the filter element must be regenerated while the vehicle is running, so it is difficult to manage the combustion temperature of carbon particles and regenerate the filter element. It is necessary to automatically control the determination of the start time and the end time of regeneration work, and for this purpose, it is necessary to control the regeneration heat source such as a heater or burner, various sensors, air blowers, and the start and end times of regeneration work. This requires a control device for control, which not only increases cost, but also requires a large installation space and is heavy.

(In addition, general agricultural and construction equipment such as tractors have short working hours per day and return to base at night, so there is no need to perform regeneration work while driving. However, since it is not suitable to install conventional particulate traps on ordinary working machines from a cost perspective, there is a need to develop particulate traps suitable for working machines. There were no traps.

The present invention has been made with attention to such points, and an object of the present invention is to provide a particulate trap that has a simple structure and is suitable for an engine mounted on a working machine.

(Means for Solving the Problems) In order to achieve the above object, the present invention connects the exhaust gas introduction part of the casing containing the ceramic filter element therein to the exhaust port of the engine mounted on the working machine, and It is characterized in that the exhaust gas introduction part is branched to have a ventilation opening, and the ventilation opening is sealed with an openable and closable lid.

(Function) In the present invention, the exhaust gas introduction part of the casing that houses a ceramic filter element therein is communicated with the exhaust port of the engine mounted on the working machine, and the exhaust gas introduction part is branched to have its ventilation opening. Since the ventilation opening is sealed with a cover that can be opened and closed, the ventilation opening cover can be removed during the rest period after the work equipment returns to the base, and the ventilation By attaching a hot air generator to the opening or exhaust gas outlet side and blowing hot air from the hot air generator into the casing, the hot air causes the carbon particles trapped in the filter element to self-combust, regenerating the filter element. do.

(Embodiment) The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view of the main part, and FIG. 2 is a configuration diagram of the main part of a tractor showing an example of use of the particulate trap according to the invention.

This particulate trap (1) is a tractor (2)
It is installed in the exhaust gas outlet path (3) of the diesel engine (E) installed in the vehicle, and is configured as a muffler-cum-particulate trap that also has a silencing function.

This particulate trap (1) has a casing (4
) houses a filter element (5) made of ceramics and a silencing mechanism (6), and the exhaust gas introduction pipe (7) led out from the casing (4) is composed of a T-shaped tube.
A branch pipe (7a) serving as a leg of the T-shaped pipe is connected to the exhaust manifold (8) of the engine (E), and a straight pipe part (7b) of the T-shaped pipe is formed as a ventilation opening (9).
This ventilation opening (9) is hermetically closed by a plate-shaped flange (10) so that it can be opened and closed.

Reference numeral (11) in the figure is an exhaust outlet pipe led out from the casing (4).

Particulate trap (1) configured as described above
is used with the ventilation opening (9) sealed with the plate-shaped flange (10) during normal work. Therefore, the exhaust gas discharged from the exhaust manifold (8) of the engine (E) flows into the casing (4) from the exhaust introduction pipe (7), and is mixed into the exhaust gas while passing through the filter element (5). The carbon particles that are present are captured by the filter element (5). Then, the exhaust gas from which the carbon particles have been removed passes through the silencing mechanism (6) and the exhaust outlet pipe (
11) will be released to the outside.

After finishing the day's work and returning to the base, the third
As shown in the figure, the plate-shaped flange (11) blocking the ventilation opening (9) formed in the exhaust introduction pipe (7) is removed to open the ventilation opening (9), and the ventilation opening (9) is opened. (9) is a heater (13) and a blower fan (14) that operate on commercial power.
) of the hot air generator (15).
6) into the straight pipe part (7b) of the exhaust introduction pipe (7) beyond the branch point between the branch pipe (7a) part and the straight pipe part (7b), and then insert it from the hot air generator (15). The carbon particulates captured in the filter element (5) are burned by the supplied high-temperature hot air to remove the filter element (5).
to play. At this time, the straight pipe (
7b) is blocked by the air guide pipe (16) of the hot air generator (15).
) does not flow into the engine side.

FIG. 4 shows a modification of the present invention, which includes the branch pipe (7a) portion of the exhaust introduction pipe (7) and the exhaust manifold (8).
The flow path on-off valve (17) is connected to the flow path on-off valve (17) during the regeneration work of the filter element (5).
7) to close the particulate trap (1).
) and the engine (E), open the ventilation opening (9) in the straight pipe part (7b) of the exhaust inlet pipe (7), and install a hot air generator in the exhaust outlet pipe (11). (1
5) to regenerate the filter element (5). In this case, combustion waste gas resulting from combustion of carbon particles will be released into the atmosphere through the ventilation opening (9).

FIG. 5 shows yet another embodiment, which includes the branch pipe (7a) portion of the exhaust introduction pipe (7) and the exhaust manifold (8).
) through a flow path on-off valve (17), and a flow path on-off valve (18) is also arranged on the exhaust outlet pipe (11), and the exhaust outlet side of the filter niremen 1-(7) is A hot air inlet (19) during regeneration is formed in the casing (4) of the filter element (5), and both flow passage opening/closing valves (17) and (18) are operated to close during regeneration work of the filter element (5). ) with the engine (E) and with the exhaust outlet pipe (11) cut off, open the exhaust inlet pipe (
7) Open the ventilation opening (9) of the straight pipe part (7b),
A hot air generator (15) is attached to the hot air blowing port (19) during regeneration to regenerate the filter element (5). Note that the hot air blowing port (19) during regeneration is hermetically closed with a plug or other closing means except during regeneration work.

In the above embodiment, the particulate trap has been described as a dual-purpose type with a noise-reducing function, but it goes without saying that the present invention can also be applied to a dedicated particulate trap.

(Effects) The present invention allows the exhaust gas introduction part of the casing that houses a ceramic filter element inside to communicate with the exhaust port of the engine mounted on the working machine, and also branches the exhaust gas introduction part and opens the ventilation opening. Since the ventilation opening is sealed with a cover that can be opened and closed, the ventilation opening cover can be removed during the downtime after the work equipment returns to the base. By attaching a hot air generator to the opening or exhaust gas outlet side and blowing hot air from the hot air generator into the casing, the hot air causes the carbon particles trapped in the filter element to self-combust, regenerating the filter element. can do. As a result, the particulate trap itself is not equipped with a heat source, a detection means for detecting the regeneration period, an air supply means (blower) for self-combusting the carbon particles, and a control means for controlling the regeneration work. Therefore, the structure of the particulate trap is simplified, and a particulate trap that is small and lightweight in terms of weight and volume can be provided.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a vertical cross-sectional view of a particulate trap, FIG. 2 is a configuration diagram of main parts of a tractor showing an example of use of the particulate trap according to the present invention, and FIG. 3 is a batiki collection. - A vertical cross-sectional view showing a regenerated state of the todrap, and FIGS. 4 and 5 are schematic configuration diagrams showing modified examples of the present invention, respectively. E... Day cell engine, ■... Particulate trap, 3... Exhaust gas discharge path, 4... Casing, 5... Filter element, 7... Exhaust gas introduction part, 8... - Engine exhaust port, 9... Ventilation opening, 10... Lid body. Patent applicant Ripota Co., Ltd. Figure 4 Figure 2 Figure 1

Claims (1)

[Claims] 1. Exhaust gas discharge path (3) of diesel engine (E)
A particulate trap placed in a particulate trap, in which the exhaust gas introduction part (7) of a casing (4) containing a ceramic filter element (5) is connected to the exhaust port (8) of an engine (E) mounted on a working machine. ), the exhaust gas introduction part (7) is branched, a ventilation opening (9) is opened, and this ventilation opening (9) is sealed with an openable/closable lid (10). A particulate trap for diesel engines mounted on work equipment featuring the following.