JP3674099B2 - Filter regeneration device for internal combustion engine - Google Patents

Description

[0001]
[Industrial application fields]
In the present invention, in order to perpetuate the collection performance of a filter that collects particulates (particulate matter) contained in exhaust gas discharged from a diesel engine (internal combustion engine), the particulates collected by the filter are used. The present invention relates to a filter regeneration device for an internal combustion engine that removes by heating and combustion and regenerates the collection performance of the filter, and more specifically, relates to a configuration in which the regeneration device is mounted on a forklift.
[0002]
[Prior art]
Diesel engines have the characteristics of higher combustion efficiency and superior durability than gasoline engines, but have the disadvantage of discharging a lot of air pollutants. Exhaust gas emitted by diesel engines contains particulates as well as nitrogen oxides, and exhaust gas regulations are being strengthened. Particulates mainly consist of three types: SOF (Soluble Organic Fraction), soot, and sulfur compounds. As a method of treating this particulate in the exhaust system, a method of collecting particulates using a filter is also available. As a method of regenerating the trapping performance, a method of burning and removing particulates in a filter has become the mainstream.
[0003]
It is known that the particulates burn from about 600 ° C., and a microwave heating method or the like is considered as an energy generating means for raising the temperature of the particulates to this high temperature range.
[0004]
The region where the particulates are strongly dielectrically heated is on the exhaust gas inflow side of the filter, but the air in the vicinity of the filter end surface is difficult to be heated with respect to the temperature inside the filter. It is difficult to raise the temperature of the accumulated particulates to a temperature range in which the particulates can shift to the combustion state. This suggests that it is difficult to burn and remove particulates accumulated on the exhaust gas inflow side of the filter, and this causes accumulation of particulates on the upstream side of the exhaust gas of the filter. As a result, the exhaust gas flow may be hindered and the engine may malfunction.
[0005]
For this reason, a regenerator that burns and removes particulates collected by a filter in a direction opposite to the exhaust gas flow direction by a microwave heating method has become known.
[0006]
As the reproducing apparatus, there is, for example, JP-A-4-353207, and FIG. 6 shows an apparatus disclosed therein. In FIG. 6, 101 is a heating space, 102 is a filter, 103 is a microwave generation means, and 104 is a gas supply means.
[0007]
[Problems to be solved by the invention]
However, the reproducing apparatus in the above-mentioned conventional example mainly includes operation and configuration means in collection / regeneration, and there has been no disclosure about means for mounting the reproducing apparatus on a forklift or the like for practical use.
[0008]
In addition to the above-described conventional example, that is, a regenerator that burns and removes the particulates collected by the filter from the direction opposite to the exhaust gas flow direction, the present invention has a practical configuration for mounting the regenerator on a forklift. The purpose is to provide maintenance.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a filter regeneration device for an internal combustion engine of the present invention has the following configuration.
[0010]
That is, a regenerative pipe comprising a heating space having an exhaust inlet pipe connecting an exhaust pipe of an internal combustion engine, a filter connected to the heating space for collecting particulates, and an annular waveguide connected to the filter A reproduction power supply unit comprising: a body part; a microwave generation means for generating a microwave to feed power to the reproduction tube body part; a drive power supply for the microwave generation means; and a linear waveguide for transmitting the microwave The regenerative tube body portion and the regenerative power source portion constitute a regenerator by connecting the annular waveguide and the straight waveguide through a connecting surface, and the regenerator is operated by a forklift. Equipped with the exhaust gas flow direction perpendicular to the rear side of the seat and provided with a side column mounting member fixed to a lift side column that supports the regeneration tube portion, the side column mounting member is the regeneration tube portion made with a sliding means It was formed.
[0011]
[Action]
The present invention has the following effects by the above-described configuration.
[0012]
That is, the filter regeneration device for an internal combustion engine of the present invention comprises a regeneration tube body portion and a regeneration power source portion, and both regeneration portions constitute a series of regeneration devices by connecting both waveguides to a connecting surface, The above regenerator is equipped with a vertical exhaust gas flow direction behind the forklift on the driver's seat side, so that this regenerator can of course be used for newly produced forklifts, as well as for side- It can be attached using a lift top and the like, and the filter can be stacked and assembled.
[0013]
Further, the side column attaching member fixed to the lift side column and supporting the regenerative tube body part can slide the heating space portion in accordance with the expansion and contraction of the exhaust pipe by providing the regenerative tube body sliding means.
[0014]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0015]
1 to 4, reference numeral 1 denotes an internal combustion engine (diesel engine), and 2 denotes an exhaust pipe for exhausting the exhaust gas of the internal combustion engine 1, which partially constitutes a telescopic member 2a.
[0016]
First, the regeneration pipe body 3 is an exhaust inlet pipe for connecting the exhaust pipe 2, and the other is connected to the heating space 4. Reference numeral 5 denotes a filter having a honeycomb structure that collects particulates contained in the exhaust gas while the exhaust gas passes through. A heat insulating material 6 and a tube wall 7 that suppress the exhaust gas from being discharged to the outer periphery, and the tube wall. The heating space 4 is detachably connected to the heating wall 4 via a gasket 10 that suppresses the exhaust gas from being discharged to the atmosphere.
[0017]
An annular waveguide 11 is formed with two feeding holes 12 and 13 near the center, and is detachably connected to the downstream wall 9 via a gasket.
[0018]
Reference numeral 14 denotes an exhaust outlet pipe connected to the other end of the annular waveguide 11, which controls an exhaust top 14 a that opens the outlet to the atmosphere and the flow of each gas containing oxygen to the filter 5 in the middle. A second valve 17 for opening and closing the first valve 15 and the flow hole 16 is provided.
[0019]
Reference numerals 18 and 19 denote microwave shielding means having a punching hole configuration or a honeycomb configuration, which limit a space for substantially confining the microwaves.
[0020]
A branch path pipe 20 branched from the exhaust inlet pipe 3 serves as a passage for the gas passed through the filter 5 at the time of filter regeneration, and a through hole for opening and closing the outlet of the second valve 17. 16, the exhaust outlet pipe 14 is joined. The branch path pipe 20 includes an inlet branch pipe 21 that connects the exhaust inlet pipe 3 and the heating space 4, a filter branch pipe 22 that connects the upstream wall 8 and the downstream wall 9, and the annular waveguide. A pipe 11 connecting surface and an outlet branch pipe 23 for connecting the second valve 17 are connected through the two gaskets to form a series of branch path pipes 20.
[0021]
Reference numeral 24 denotes temperature detection means disposed in the exhaust inlet pipe 3, reference numeral 25 denotes microwave detection means disposed in the exhaust gas non-flow space of the filter 5, and reference numerals 26 and 27 denote outer peripheral surfaces of the heating space 4, respectively. It is a tube attachment member connected to the outer peripheral surface of the annular waveguide 11 and has a plurality of connecting members (for example, welding bolts) 28. The above is generally referred to as a regenerated tube part.
[0022]
Next, a regenerative power supply unit 31 is a microwave generating means for generating a microwave to feed the heating space 4 in order to dielectrically heat the particulates, and 32 is a microwave for generating the microwave generated by the microwave generating means 31. A linear waveguide 33, which is transmitted to the space 4, is a driving power source for the microwave generating means 31, and driving power is supplied from a commercial power source by an electric cable 34.
[0023]
35 is a gas supply means (denoted as A / P in the figure) for generating a gas containing oxygen to be supplied to the heating space 4, and 36 is a tube for conveying the gas, and the first valve 15 of the exhaust outlet pipe 14 It is connected to the heating space 4 side from the arrangement position. Reference numeral 37 denotes a drive motor (denoted as Mv in the figure) which is a drive means for the first and second valves 15 and 17, and the drive part thereof is a drive part of both valves 15 and 17 having an interlocking structure. They are connected by a wire 38.
[0024]
Reference numeral 39 is a control means which is an electronic control unit (denoted as ECU in the figure). The temperature detection means 24 allows the exhaust gas temperature to be changed when the internal combustion engine 1 is operated, and the gas temperature passed through the filter 5 when the filter 5 is regenerated. Further, the microwave detection means 25 detects the amount of microwaves existing in the vicinity of the installation space when the microwave generation means 31 is in operation, and each of them is input to the control means 39 as a detection signal.
[0025]
The control unit 39 has a collection amount determination map defined in advance, and stores in advance a lower limit value and an upper limit value of the collection amount that permit the regeneration of the collection performance of the filter 5.
[0026]
The microwave generation means 31 is periodically operated during the operation of the internal combustion engine 1, and the microwave amount detected by the microwave detection means 25 and the integrated value of the operation time of the internal combustion engine 1 at the time of detection are Is compared with the collection amount map to determine the current collection amount. The control means 39 controls the operation of the microwave generation means 31, the gas supply means 35, and the drive motor 37 when the current collection quantity is in the collection quantity range that permits regeneration of the filter 5.
[0027]
Reference numeral 40 denotes a power supply box that accommodates these power supply members. The linear waveguide 32 projects from the side surface of the power supply box 40. A ceiling member 41 is provided on the top surface. The above is generally referred to as a reproduction power supply unit.
[0028]
The above-described regeneration tube body and regeneration power source are connected at the connecting surfaces 11a and 32a of the both waveguides 11 and 32 with the exhaust gas flow direction set to the vertical direction to constitute a series of regeneration devices. Is.
[0029]
The microwave generated by the microwave generating means 31 is fed to the heating space 4 through both the waveguides 32 and 11 and the two feeding holes 12 and 13.
[0030]
Further, during the period in which the particulates are collected in the filter 5, that is, during the operation of the internal combustion engine 1, the first valve 15 is controlled to be in a flow state and the second valve 17 is controlled to be in a shut-off state. Let it flow.
[0031]
Further, during the period in which the filter 5 is regenerated, that is, when the internal combustion engine 1 is not operating, the first valve 15 is controlled to be in a shut-off state, and the second valve 17 is controlled to be in a flow-through state. After the temperature rises, the gas supply means 35 is operated to pass the gas that promotes the combustion of the particulates through the filter 5 and the particulates are burned and removed. The exhaust gas flows into the branch path pipe 20 and the through holes 16. The air is discharged to the atmosphere through the exhaust top 14a.
[0032]
Next, the structure which mounts this reproducing | regenerating apparatus in a forklift is demonstrated. The regenerative tube body has a side column mounting in which a plurality of connecting members 28 provided on the tube mounting members 26 and 27 are fixed to a lift side column 52 on the driver seat side rear side that supports an upper head guard 51 of a forklift. It is fixed by connecting means 28a such as a nut through a slide means 30 (for example, a slit hole) of the regenerative tube part provided in the member 29. Similarly, the regeneration power supply unit fixes a ceiling suspension member 41 provided on the top surface of the power supply box 40 to a ceiling pole mounting member 42 that is secured to a lift ceiling pillar 53 constituting the head guard 51. The device is installed with the exhaust gas flowing in the vertical direction behind the driver seat of the forklift.
[0033]
Reference numeral 54 denotes an engine cover that is rotated backward during maintenance of the engine or the like, and 55 denotes a driver seat positioned above the engine cover 54.
[0034]
As is apparent from FIG. 2, the reproducing apparatus is configured to be positioned in an upper space from the lift side column 52 that supports the upper head guard 51 of the forklift to the driver's seat 55 when viewed from the rear of the vehicle.
[0035]
Further, as is apparent from FIG. 3, the reproducing apparatus is configured to be located outside the head guard 51 of the forklift in plan view.
[0036]
In the above configuration, the regenerator is connected to the heating space 4 having the exhaust inlet pipe 3 connecting the exhaust pipe 2 of the internal combustion engine 1, the filter 5 connected to the heating space 4 and collecting particulates, and the filter 5. A regenerative tube body portion provided with an annular waveguide 11, a microwave generating means 31 for generating a microwave to feed power to the regenerative tube body portion, a driving power source 33 for the microwave generating means 31, and a microwave transmission And the regenerative tube body portion and the regenerative power source portion connect the annular waveguide 11 and the linear waveguide 32 to the connecting surfaces 11a and 32a. Are connected to form a playback device. The regenerator can be installed with the exhaust gas flowing in the vertical direction behind the driver seat 55 side of the forklift. Therefore, this regenerator can be mounted immediately on a forklift to be newly produced by using the side column 52 or the lift top column 53 on an already-sold vehicle, and the filter 5 is stacked and assembled. Therefore, maintenance work such as replacement of the filter 5 is possible and easy even by one person.
[0037]
Further, the playback device is configured to be positioned in an upper space from the lift side column 52 that supports the upper head guard 51 of the forklift to the driver's seat 55 when viewed from the rear of the vehicle. The field of view can be sufficiently secured without being obstructed by the playback device. In addition, since the playback device does not protrude outside the lift side column 52, the left rear side of the driver's seat can be easily confirmed by looking slightly outside the lift side column 52.
[0038]
Further, the regenerator is configured so as to be positioned outside the head guard 51 of the forklift in a plan view, so that it is possible to secure a distance between the driver's seat 55 and the regenerative tube part that becomes high temperature.
[0039]
Further, since the exhaust pipe 2 connected to the exhaust inlet pipe 3 of the regeneration pipe body partly constitutes an expansion / contraction member 2a, vibration absorption of the internal combustion engine 1 can be achieved and the exhaust pipe 2 can be expanded and contracted freely. Thus, dimensional displacement at the time of connection to the exhaust inlet pipe 3 can be absorbed.
[0040]
Further, since the side column attaching member 29 fixed to the lift side column 52 and supporting the regenerated pipe body part is provided with the slide means 30 of the regenerated pipe body part, as shown in FIG. After uncoupling the wave tube 11, the heating space 4 can be slid in accordance with the expansion and contraction of the exhaust pipe 2 simply by loosening the connecting means 28a, and the position control at the time of detachment such as when the filter 5 is replaced can be achieved. Further, there is no shake of the heating space 4 part, and the work becomes easier.
[0041]
Next, another embodiment of the present invention will be described with reference to FIG.
[0042]
In FIG. 5, the difference from the above embodiment is that an elbow portion 14b is provided on the exhaust top 14a connected to the outlet of the regeneration tube portion, and the outlet side is configured downward as shown in FIG. Yes.
[0043]
The elbow portion 14b provided on the exhaust top 14a has a plurality of bellows processings 14c.
[0044]
In the exhaust top 14a configuration described above, the elbow portion 14b can be configured to prevent foreign matter from falling into and entering the exhaust top, resulting in malfunction due to biting into the first valve 15 and the like. Can be prevented.
[0045]
Further, by forming a plurality of bellows processings 14c on the elbow part 14b, the elbow exit direction can be freely changed, and exhaust gas can be discharged in a direction that is particularly suited to the working environment in the factory. It becomes.
[0046]
In the present invention, the microwave heating method is used as the energy generating means, and the configuration is described in which the combustion is regenerated from the direction opposite to the exhaust gas flow direction. However, the present invention is not limited to this. It is clear that the same effect can be obtained with a playback device having a playback unit.
[0047]
【The invention's effect】
As described above, according to the filter regeneration device for an internal combustion engine of the present invention, the following effects can be obtained.
[0048]
(1) A regenerative tube comprising a heating space having an exhaust inlet pipe for connecting an exhaust pipe of an internal combustion engine, a filter connected to the heating space for collecting particulates, and an annular waveguide connected to the filter And a regeneration power supply section comprising a microwave generation means for generating a microwave to be fed to the regeneration tube body section, a drive power supply for the microwave generation means, and a linear waveguide for transmitting the microwave And the regenerative tube body portion and the regenerative power source portion constitute the regenerator by connecting the annular waveguide and the straight waveguide through a connecting surface, and the regenerator is on the driver seat side of the forklift. Since the exhaust gas flow direction is installed in the vertical direction at the rear, this regenerator can of course be installed on a forklift that is newly produced, and can also be installed immediately on an existing vehicle. assembly Will form as, maintenance of filter replacement or the like becomes possible and easy even one person.
(2) Since the side column attaching member fixed to the lift side column and supporting the regenerated tube body includes slide means for the regenerated tube, the heating space can be slid according to the expansion and contraction of the exhaust pipe. This makes it possible to regulate the position at the time of detachment such as when replacing the filter, to prevent the heating space from shaking, and to further facilitate the work.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an operation state during filter regeneration of an internal combustion engine filter regeneration device according to an embodiment of the present invention. FIG. 2 is a configuration diagram showing a forklift attachment state of the internal combustion engine filter regeneration device. 2 is a cross-sectional view taken along line AA in FIG. 2. FIG. 4 is a block diagram of the internal combustion engine filter regeneration device when the heating space is slid. FIG. 5 is an internal combustion engine filter regeneration device according to another embodiment of the present invention. Fig. 6 is a block diagram showing a conventional filter regeneration device for an internal combustion engine.
DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Exhaust pipe 2a Expansion / contraction member 3 Exhaust inlet pipe 4 Heating space 5 Filter 11 Annular waveguide 11a Connection surface 14a Exhaust top 14b Elbow part 14c Bellows processing 26 Tube attachment member 27 Tube attachment member 29 Side column attachment member 30 Slide means 31 Microwave generation means 32 Linear waveguide 32a Connecting surface 33 Driving power supply 51 Head guard 52 Lift side pillar 55 Driver's seat

Claims (1)

A regenerative tube body section comprising a heating space having an exhaust inlet pipe for connecting an exhaust pipe of an internal combustion engine, a filter connected to the heating space for collecting particulates, and an annular waveguide connected to the filter And a microwave generator for generating a microwave to feed the regeneration tube body, a drive power supply for the microwave generator, and a regeneration power supply having a linear waveguide for transmitting the microwave And the regenerative tube body portion and the regenerative power source portion constitute the regenerator by connecting the annular waveguide and the straight waveguide through a connecting surface, and the regenerator is on the driver seat side of the forklift. Equipped with a vertical exhaust gas flow direction at the rear, a side column mounting member fixed to a lift side column that supports the regeneration pipe body portion is provided, and the side column mounting member is a slide of the regeneration pipe body portion. for an internal combustion engine which is equipped with a means Filter playback device.

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