JPH04105921U - Exhaust particulate trap for diesel - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a particulate trap that can generate uniform heat with low power consumption. [Structure] A heater element 6 is provided on the front side of the honeycomb filter for collecting particulates. The heater element 6 includes a ceramic plate 6b having a large number of openings 6a, a plurality of heating wires 6c provided on the ceramic plate 6b, and a ceramic plate 6 from above the heating wires 6c.
It is composed of a heat-generating paint 6f applied to the entire surface of b.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention aims to improve the effectiveness of the exhaust gas from internal combustion engines, especially diesel engines. Regarding exhaust particulate traps that collect and burn curates (fine particles) Ru.

0002

[Conventional technology]

In diesel engines, relatively large numbers of particulates are contained in exhaust gas. This type of engine has a trap installed in the exhaust system to collect this. ing. In such traps, when the collected particulates are deposited, Since problems such as a decrease in output may occur, the data is played back in a predetermined state. exhaust patty There are various ways to regenerate traps, but one of them is to use a heater. They are said to have a relatively stable regeneration ability.

0003 The general configuration of regeneration means using a heater is a filter for collecting particulates. On the element (ceramic honeycomb filter or foam filter, etc.) A heater element is placed on the flow side, and the collected particulates are This is removed by periodically igniting and burning through this heater element. This regenerates the filter element. However, reconfiguration like this There were technical issues with this method, which will be explained below.

0004

[Problem that the idea aims to solve]

In other words, conventional regeneration means simply install a heater in front of the filter element. This requires a large amount of electric capacity from the heater, and also reduces the temperature of the heater element. There was a problem that the degree distribution was not uniform. In other words, the patties attached to the filter It takes a lot of electricity to burn curate using the heat generated by the heater, and it also requires a lot of electricity. This results in an uneven temperature distribution where only the wire section of the terminal is high temperature and the other parts are low temperature. However, there was a problem in uniformly regenerating the entire surface of the filter.

[0005] This invention was devised to solve such problems, and its purpose is , an exhaust for diesel engines that consumes less electricity and provides uniform heat generation temperature distribution. Our goal is to provide particulate traps.

[0006]

[Means to solve the problem]

In order to achieve the above objective, the present invention aims to reduce the A honeycomb filter that collects particulates, and a honeycomb filter that collects particulates. A filter is installed in front of the honeycomb filter to ignite the collected particulates. In the exhaust particulate trap equipped with a heater element, the The data element includes a ceramic plate having an opening and a ceramic plate provided on the ceramic plate. and a heating wire coated on the surface of the ceramic plate. Features.

[0007]

[Effect]

According to the above configuration, particulates contained in diesel engine exhaust gas is collected by the honeycomb filter and the exhaust pressure of the filter increases, the heating wire is energized. Then, the heat-generating paint also becomes hot due to the temperature rise, so it can be heated with less electricity. Generates heat over the entire surface of the filter element, which evenly distributes the collected particulates. It becomes possible to burn it.

[0008]

【Example】

Hereinafter, one embodiment of this invention will be described in detail using the drawings. Figures 1 and 2 are , A part of the exhaust particulate trap for diesel engines according to this invention An example is shown. In the figure, 1 is an exhaust gas inlet member, and 2 is an exhaust gas outlet part. A cylindrical container 4 is arranged between these members. Inside this container 4 A porous honeycomb filter 5 as a filter element is tightly fitted in the part. It is located in the state.

[0009] A heater element 6 is provided on the front surface of the honeycomb filter 5. Ru. The heater element 6 is sandwiched between the exhaust gas inlet member 1 and the container 4. , a ceramic plate 6b having a large number of openings 6a, and a ceramic plate 6b provided on the ceramic plate 6b. The heating wires 6c are coated on the entire surface of the ceramic plate 6b from above the heating wires 6c. It is composed of a heat-generating paint 6f that has been applied.

0010 The heating wires 6c of this embodiment include four heating wires arranged substantially parallel to each other at intervals in the vertical direction. Each pair of heating wires 6c is connected in parallel, and this parallel connection Connect the connected ones to the + and - poles of the DC power supply (not shown) using lead wires 6d and 6e, respectively. has been done.

[0011] The internal structure of the honeycomb filter 5 is separated by porous honeycomb walls 7. It is composed of a plurality of cells 8, with one end 8a of one cell 8 and a By alternately closing the other ends of adjacent cells 8 with plugs 9, The exhaust gas flowing into the cell 8a passes through the porous honeycomb wall 8 and flows into the adjacent cell 8. A so-called wall-through type ceramic filter is configured to be discharged from the It is a filter.

0012 In this case, the ceramic filter 5 is used in a parapet to effectively perform regeneration through combustion. All catalyst processing is done using dium (Pd), platinum (Pt), rhodium (Rh), etc. It is desirable to Note that the member 6g shown in FIG. 1 supplies power to the heating wire 6c. This is an external connection socket for power supply.

[0013] In the above configuration, the exhaust gas flowing in from the exhaust gas inlet member 1 side is Filtered when passing through the porous honeycomb wall 8 of the porous honeycomb filter 5 of the container 4 As a result, particulates adhere to the upstream side of the honeycomb wall 8 and are removed.

[0014] The honeycomb filter 5 from which particulates have been removed in this way is Clogging occurs due to accumulation of curate, which increases exhaust pressure and reduces engine output. . When the exhaust pressure of the honeycomb filter 5 increases, the electric heating of the heater element 6 A voltage is applied to the wire 6c via the lead wires 6d and 6e to generate heat. At this time, In the present invention, the entire ceramic plate 6b of the heater element 6 is heated from the top surface of the heating wire 6c. Since the heat-generating paint 6f is applied to the surface, the heat-generating paint 6f is heated by the heating wire 6c. As a result, the temperature of the heater element 6 rises to about 1,000℃, causing the patty cracker to heat up. The honeycomb filter 5 is regenerated by burning the filter.

[0015] In addition, when the honeycomb filter 5 is catalytically processed, the temperature of the heater element 6 When the temperature rises to around 400℃ to 550℃, particulates become combustible. , regeneration can be performed by applying an even smaller voltage.

[0016]

[Effect of the idea]

As explained in detail in the above embodiments, the particulate matter according to this invention For traps, the entire heater element installed at the front of the honeycomb filter Since the surface is coated with heat-generating paint, the particulates collected in the honeycomb filter are burned. It has the advantage that it requires less electricity to regenerate and can be regenerated evenly.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a particulate trap according to this invention.

FIG. 2 is a front view of a heater element of the particulate trap.

[Explanation of symbols]

1 Exhaust gas inlet member 2 Exhaust gas outlet member 4 Cylindrical container 5 Honeycomb filter 6 Heater element 6b Ceramic plate 6c heating wire 6f heat generating paint

Claims (1)

[Scope of utility model registration request] 1. A honeycomb filter that collects particulates contained in exhaust gas of a diesel engine, and a heater element provided in front of the honeycomb filter to ignite the particulates collected by the honeycomb filter. In the exhaust particulate trap, the heater element includes a ceramic plate having an opening, a heating wire provided on the ceramic plate,
An exhaust particulate trap comprising: a heat-generating paint applied to the surface of the ceramic plate.