JPH034736Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a particulate trapper for removing particulate from exhaust gas in a diesel engine.

[Conventional technology]

The conventional particulate removal device, that is, the particulate trapper in a diesel engine has problems such as severe clogging, requiring early replacement, and shortcomings such as a lack of durability and reliability.

[Means to solve the problem]

In order to make the replacement of the particulate trapper easier, two sets of particulate filters with a collected material combustion device are arranged, and a switching valve allows one filter to collect particulate while the other filter is in the process of collecting particulate. There is an invention disclosed in Japanese Patent Publication No. 10298/1983 in which the collected material is combusted and regenerated by supplying combustion air.

In this prior art, the particulate filter that collects and regenerates is replaced after the combustion of the particulate is completed, and there is a problem in that the device is inadequate in detecting the timing of replacement. In addition, when switching the prior art with one switching valve,
Depending on the switching valve used, there is a problem in that it has a large flow resistance and is not suitable for use with exhaust gas containing particulate, which tends to adhere and accumulate on the valve.

Another prior art is an implementation in which two lines of particulate filters each equipped with a pressure detection device are installed, and when the internal pressure of the particulate filter on the particulate collecting side exceeds a certain value, collection and regeneration are automatically switched. There is an idea published in 1977-37919. This publication describes an embodiment in which a two-way valve consisting of a butterfly valve is used as the switching valve. However, this prior art has a problem in that the control means are complicated.

The present invention was developed with a focus on the above problems, and is a switching valve that is used when switching between two series of particulate filters to perform collection and regeneration alternately. The resistance is extremely low, and it is possible to detect clogging of the putty filter due to collected particulate and remove the collected particulate.
It is an object of the present invention to provide a particulate trapper equipped with a control device that automatically switches regeneration.

[Means to solve the problem]

The structure of the particulate trapper to achieve the above object is to provide a branch pipe that branches the exhaust pipe into two directions, and open an air pipe at the branched part and at a position facing the exhaust pipe. A butterfly valve is attached to the branch part to enable switching of the branch pipe connected to the exhaust pipe and the air pipe, and
A putecurate filter with a heater is attached to each of the branch pipes, and when the detected pressure of a pressure sensor provided upstream of the butterfly valve exceeds a set value, the butterfly valve is rotated to switch the connection, and the A control device is provided to operate the heater connected to the air pipe.

〔Example〕

One embodiment will be described below in detail with reference to the drawings.

1 is a diesel engine, and an exhaust pipe 3 is connected to an exhaust manifold 2 of the diesel engine. A composite exhaust pipe 30 consisting of branch pipes 31 and 32 branched into two directions is disposed in the middle of the exhaust pipe 3, and a silencer 4 and the like are disposed behind the composite exhaust pipe 30. branch pipe 31,
32 includes particulate filters 5, 5.
1 and electric heaters 6 and 61 are provided.

A control valve 7 is rotatably provided at a branch portion 30a of the composite exhaust pipe 30 about a shaft 71, and an air pipe 8 for introducing fresh air is connected thereto. 8
Reference numeral 1 indicates an air pump, and reference numeral 82 indicates an air filter.

Reference numeral 9 denotes a control device in which exhaust pressure detected by a pressure sensor 93 provided at the tip side of the composite exhaust pipe 30 exceeds a set value and detected by temperature sensors 91 and 92 installed in the filters 5 and 51. The filter side that operates when the filter internal temperature falls below a set value, rotates the control valve 7 using the electromagnetic actuator 10, lever 11, etc., switches the flow of exhaust gas, and at the same time stops introducing exhaust gas. The air pump 81 works to introduce fresh air into the air pump 81, and the heaters 6, 6 on the fresh air introduction side
1 also operates, and 90 is its power source.

The particulate trapper according to the present invention is constructed as described above, and its functions are as follows.

First, when the exhaust gas is being passed through the filter 5 and the particulate matter collected by the filter 5 becomes excessive, the control device 9 is activated by the exhaust pressure sensor 93 and the temperature sensor 91. The output of this control device 9 causes the electromagnetic actuator 10 to
is activated, and at the same time the control valve 1 is switched from the position shown by the double-dashed line to the position shown by the solid line via the lever 11 etc., the heater 6 is activated.

Then, the exhaust gas (black arrow in Figure 2) is sent to the filter 51 side, and at the same time, fresh air (white arrow in Figure 2) is introduced to the filter 5 side and re-combustion occurs within the filter. Pateculate is removed.

By repeating such control, particulate can be collected over a long period of time, and a durable and reliable particulate trapper for a diesel engine can be provided.

In addition, in order to prevent bending loss of the filter due to re-combustion within the filter, when the combustion temperature reaches the set temperature, a temperature sensor detects this and activates the control device 9, temporarily turning off the power to the heater. It is also possible to stop it.

[Effect of idea]

Since the present invention is configured as explained above, the following effects can be obtained.

That is, the switching valve consisting of a butterfly valve has a simple structure, and the circumference of the butterfly valve is wide, so the flow resistance is extremely low.Furthermore, by simply rotating the butterfly valve, the particulate filter can be collected and removed. It is possible to switch regeneration and supply combustion air at the same time.

In addition, one pressure sensor is placed upstream of the switching valve to detect clogging of the filter and switch between the collection and regeneration, which simplifies the configuration of the control device and allows the collection of putty chloride to be always maintained in a desirable state. can hold a collection.

Therefore, a highly reliable particulate trapper can be provided.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the present invention, and FIG. 2 is an enlarged sectional view showing a main part of the embodiment. 1... Engine, 3... Exhaust pipe, 30... Combined exhaust pipe, 31, 32... Branch pipe, 5, 51... Filter, 6, 61... Electric heater, 7... Control valve, 8... Air pipe, 81...Air pump, 9
...Control device, 9, 92...Temperature sensor, 93...
...Pressure sensor.

Claims (1)

[Scope of utility model registration request] A branch pipe that branches the exhaust pipe into two directions is provided, an air pipe is opened at the branched part and at a position facing the exhaust pipe, and a butterfly valve is attached to the branch part to connect it to the exhaust pipe and the air pipe. In addition to making it possible to switch the branch pipes, a putty filter with a heater is attached to each of the branch pipes, and when the detected pressure of a pressure sensor installed upstream of the butterfly valve exceeds a set value, the butterfly valve is turned. The particulate trapper is provided with a control device that switches the connection and operates the heater on the side connected to the air pipe.