JPS6349532Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a particulate trap device provided in the exhaust gas system of a diesel engine.

Conventionally, various types of diesel particulate trap devices have been developed to prevent the emission of black smoke etc. from the exhaust system of diesel engines, and the filters of these trap devices are made of ceramic foam,
It is made of metal foam, ceramic fiber, glass fiber, etc.

This trap device preferably has a large surface area in order to reduce pressure loss and improve the efficiency of trapping particulates (combustible particles).

Conventional diesel engine particulate trap devices include an axial flow type particulate trap device a and a particulate trap device a as shown in Fig. 1 and Fig. 2 (a sectional view taken along the - arrow in Fig. 1), respectively. A radial flow type particulate trap device b as shown in Fig. 3 and Fig. 4 (a sectional view taken along the - arrow in Fig. 3) is used, and an axial flow type particulate trap device a is used. There are problems in that a sufficient surface area (adsorption area) of the cylindrical filter 1 cannot be obtained, resulting in a decrease in particulate collection efficiency, and an increase in pressure loss, resulting in a decrease in engine output performance.

In addition, in the radial flow type particulate trap device b, a cylindrical filter 1' with a front plate 4 is used.
A compact trap device with a large surface area can be realized by radial flow of gas into the trap. There is a problem in that the patty cure does not regenerate sufficiently.

Further, in the conventional particulate trap device, there is a problem that the filters 1, 1' cannot be reliably attached to the casing 3 via the cushions 2, etc., resulting in poor assembly.

The present invention aims to solve these problems by securing a sufficient surface area and eliminating the part of the filter that makes it difficult to incinerate particulate during regeneration, thereby improving the collection efficiency of particulate. An object of the present invention is to provide a diesel particulate trap device which can be easily assembled.

Therefore, the diesel particulate trap device of the present invention includes a casing formed by expanding the exhaust pipe of a diesel engine, a particulate collecting filter installed inside the casing, and a particulate collecting filter that is attached to the casing. and a mounting member to be attached to the filter.
The filters are formed as a pair of rectangular flat filters arranged so that their surface portions face each other so as to form sides of a truncated pyramid, and the mounting member is attached to each side of the pair of rectangular flat filters. The mounting member is attached to the casing so that the bottom surface of the truncated pyramid formed by the filter and the mounting member covers the inlet or outlet of the casing. It is characterized by

An embodiment of the present invention will now be described with reference to the drawings. Figs. 5 and 6 show a diesel particulate trap device as one embodiment of the present invention, Fig. 5 being a longitudinal sectional view thereof, and Fig. 6 being a sectional view taken along the line - of Fig. 5.

As shown in Figures 5 and 6, the exhaust pipe B of the diesel engine is expanded to form a rectangular cylindrical casing 3', and within this casing 3' is a rectangular flat plate for collecting particulate matter in the exhaust gas. A particulate filter collection filter (DPF) 1″ is installed.

The filters 1'' are formed as a pair of upper and lower rectangular flat filters, and the outer surface portions 1''b of each filter 1'' form the side surfaces of a truncated pyramid, and the inner surface portions 1''a thereof form opposing sides. are arranged in

And a pair of upper and lower rectangular flat filters 1″,
Side plates 5, 5 as attachment members are attached to each side of the housing 1'' via a cushion 2, and the side plates 5, 5 are fixed to the casing 3'.

Further, the bottom surface of the truncated pyramid is arranged so as to cover the inlet portion 3'a of the casing 3' on the upstream side of the exhaust pipe B, and the truncated surface of the truncated pyramid has a front plate 6.
is provided.

In addition, the side plate 5 and the front plate 6 as attachment members
It may be formed integrally with.

Further, the filter 1'' may be coated with a catalyst layer.

Since the diesel particulate trap device of the present invention is constructed as described above, the exhaust gas from the diesel engine is collected from the casing 3'.
The air flows through the filter 1'' through the inlet portion 3'a of the filter 1'' as a radial flow from the inner surface 1''a to the outer surface 1''b of the filter 1''.

At this time, particulate matter is collected in the filter 1'', and the purified exhaust gas is discharged into the atmosphere through the exhaust port 3'b.

In this way, the flow of exhaust gas inside the filter 1'' is from the inner surface 1''a to the outer surface 1''b of the filter 1'', so the surface area (adsorption area) for collecting particulate is large. As a result, particulate matter is reliably captured.

To regenerate the diesel particulate filter 1'', the particulate is combusted by supplying heated exhaust gas or the like into the casing 3'.

At this time, as shown in FIG. 5, the regeneration combustion gas flows into the filter 1'' by radial flow, and also flows from the inner surface 1''a toward the outer surface 1''b. Since the particulate matter is discharged from the outlet 3'b of the casing 3', poor regeneration of the particulate at the downstream end of the filter 1'' is eliminated.

That is, since the flow of combustion gas thoroughly spreads over the entire filter 1'', it becomes easy to regenerate the difficult-to-regenerate portion at the rear end of the filter 1''.

Furthermore, a pair of upper and lower rectangular flat filters 1'',
1'' is assembled to the casing 3' by the side plates 5, 5 as attachment members, so that the casing 3' and each filter 1'', 1'' can be firmly fixed.

Note that the filters 1'', 1'' and the side plates 5, 5 are arranged in different directions so that the bottom surface of the truncated pyramid covers the outlet portion 3'b of the casing 3' on the downstream side of the exhaust pipe B. You can do it like this.

As detailed above, the diesel particulate trap device of the present invention includes a casing formed by expanding the exhaust pipe of a diesel engine, and a particulate collecting filter installed inside the casing. , and a mounting member for attaching the filter to the casing,
The filters are formed as a pair of rectangular flat filters arranged so that their surface portions face each other so as to form the side surfaces of a truncated pyramid, and the mounting members are arranged on each side of the pair of rectangular flat filters. The mounting member is formed as a pair of side plates attached to the casing such that the bottom surface of the truncated pyramid formed by the filter and the mounting member covers the inlet or outlet of the casing. The following effects and advantages can be obtained with a simple configuration that can be installed.

(1) With a compact device, sufficient surface area for adsorption can be secured, improving particulate collection efficiency and improving self-regeneration effect in catalytic traps.

(2) The amount of particulate accumulated per unit area is reduced, and the heat load during regeneration is reduced.

(3) Since the increase in pressure loss (clogging) is slowed down and the frequency of regeneration is reduced, the heat load associated with regeneration can be reduced and durability is improved.

(4) Decrease in output performance can be kept to a minimum by reducing pressure loss.

(5) It becomes easier to assemble the casing and filter.

(6) By eliminating the filter portion where particulate matter is difficult to incinerate during regeneration, the collection efficiency of particulate matter can be improved.

[Brief explanation of drawings]

1 and 2 show a conventional axial flow type diesel particulate trap device, FIG. 1 is a longitudinal sectional view thereof, and FIG. Figures 3 and 4 show a conventional radial flow type diesel particulate trap device. Figure 3 is a longitudinal sectional view thereof, Figure 4 is a sectional view taken in the direction of the - arrow in Figure 3, and Figure 5 is a sectional view taken in the direction of the - arrow in Figure 3. ，
FIG. 6 shows a diesel particulate trap device as an embodiment of the present invention, FIG. 5 is a longitudinal sectional view thereof, and FIG. 6 is a sectional view taken along the direction indicated by the - arrow in FIG. 1''...Rectangular flat particulate collection filter, 1''a...Inner surface portion, 1''b...Outer surface portion,
2...Cushion, 3'...Square tubular casing,
3'a... Inlet part, 3'b... Outlet part, 5... Side plate as an attachment member, 6... Front plate, B... Exhaust pipe.

Claims (1)

[Scope of utility model registration request] A casing formed by expanding the exhaust pipe of a diesel engine, a particulate collection filter mounted inside the casing, and a mounting member for attaching the filter to the casing, the filters being attached to each other on the surface. The pair of rectangular flat filters are formed as a pair of rectangular flat filters arranged to face each other so as to form sides of a truncated pyramid, and the mounting member is attached to each side of the pair of rectangular flat filters. The mounting member is attached to the casing so that the bottom surface of the truncated pyramid formed as a side plate and formed by the filter and the mounting member covers the inlet or outlet of the casing. A diesel particulate trap device.