JP2003172128A - Exhaust gas purification device with skeletal reinforcement - Google Patents

Abstract

(57) [Summary] In this exhaust gas purifying apparatus, the shape of a filter formed in a corrugated shape is held by a skeleton reinforcing member. SOLUTION: The filter 2 has a corrugated cylindrical body 31.
The cylindrical body 31 is reinforced and held by a skeleton reinforcing member 35. The skeleton reinforcing member 35 is disposed at the disk member 40 disposed at the end 36 on the exhaust gas inflow side of the housing 1, at the end 37 at the exhaust gas outflow side, and at a predetermined location in the longitudinal direction of the filter 2. It has a ring member 42 and a gutter-shaped frame 44 disposed between the disk member 40 and the ring member 41 of the end 37 in a valley between the projections 39 and 41. The disk member 40 and the ring member 42 are provided on the outer periphery with projections 39 and 41 having a shape corresponding to the inner peripheral hill of the cylindrical body 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention collects particulate matter contained in exhaust gas discharged from an engine with a filter and energizes a heater provided in the filter to incinerate the particulate matter. The present invention relates to an exhaust gas purification device that regenerates a filter.

[0002]

2. Description of the Related Art Conventionally, as a diesel particulate filter, that is, as an exhaust gas purifying apparatus, carbon of suspended particles is contained in exhaust gas discharged from a diesel engine.
A filter having a structure in which ceramic fibers are laminated or a filter having a honeycomb structure made of porous ceramics is used to remove particulate matter such as soot, HC, and SO _X. When the filter collects the particulate matter, particles of the particulate matter are caught on the filter made of the ceramic fiber material, and these particles gradually increase in size, and are deposited while filling the gap between the adjacent fiber materials. Further, the filter that has collected the particulate matter needs to be burned and regenerated by heating the particulate matter. At that time, the heater provided in the filter must be energized to heat and burn the particulate matter to regenerate the filter. I have to. Regeneration of the filter requires a large amount of electric power, and in order to obtain the large amount of electric power, the engine is provided with, for example, a permanent magnet generator.

The diesel particulate exhaust treatment device disclosed in Japanese Utility Model Laid-Open No. 61-149715 discloses a filter member disposed in an exhaust gas passage for collecting particulates in exhaust gas. And a heater member for igniting and burning particulates disposed in the vicinity of the end of the filter member in the exhaust gas inflow direction, and further provided in the filter member so as to penetrate therethrough in the exhaust gas flowing direction. And a flow rate control mechanism for increasing the flow rate of the exhaust gas flowing into the cavity when the collected particulates are ignited and burned.

Further, the diesel particulate filter device having a self-regenerating function disclosed in Japanese Unexamined Patent Publication (Kokai) No. 8-313329 is capable of lowering the ignition temperature of particulates and reducing the supply of electric power to the energized wire mesh. A filter is arranged in each of a pair of exhaust gas passages provided in the exhaust system, and a conductive wire mesh and an oxidation catalyst wire mesh that lowers the oxidation reaction temperature are arranged in each filter. The diesel particulate filter device operates a shutter valve provided in an exhaust gas passage so as to automatically throttle the exhaust gas flow rate in response to exhaust pressure of a predetermined value or more, and the particulate metal is ignited by an oxidation catalyst wire mesh. The temperature drops,
When the shutter valve is closed, the particulate easily ignites and burns.

The particulate filter disclosed in Japanese Unexamined Patent Publication No. 8-144738 has a cylindrical shape having a corrugated concave portion and a convex portion and a concave portion engaging with the corrugated portion inside the filter at both ends of the filter. Is provided on the outside of the filter, and the second means having a convex portion formed in a corrugated concave portion is provided on the outside of the filter, and a cylindrical fastening means for fastening the filter in the thickness direction is provided on the outside of the second means. It is a thing.

Further, as a filter constituting a diesel particulate filter, one using a ceramic non-woven fabric is known (see, for example, Japanese Patent No. 3164966). Diesel particulate filter is made of ceramics non-woven fabric as a filter for trapping particulate matter contained in exhaust gas to improve the collection efficiency, reduce fiber scattering of ceramics non-woven fabric, durability and corrosion resistance. The ceramic filter is formed into a cylindrical shape by sequentially folding it in a circumferential direction between the inner side and the outer side with a ceramic non-woven fabric, and the basis weight of the ceramic non-woven fabric is 200 to 350 g / m ² . The fiber length of the ceramics non-woven fabric is adjusted to 35 mm or more by setting the range, and the wire mesh heater is arranged on the exhaust gas inflow side to the felt made of the ceramic non-woven fabric in order to heat and incinerate the particulate matter collected by the filter. The entire exhaust gas inflow side is surrounded by a wire mesh heater.

[0007]

However, the above diesel particulate exhaust treatment device ignites and burns the particulates such as carbon and smoke captured by the heater disposed in the vicinity of the filter, The filter is playing. Therefore, the exhaust gas purifier uses the propagation of flame to regenerate the area other than the tip of the filter, and due to the non-uniform soot adhesion to the filter, poor regeneration due to unburned soot and melting of the filter due to abnormal combustion. The problem is that loss and damage to the filter due to thermal stress. A conventional diesel particulate filter is provided with two filters. One filter collects particulate matter contained in exhaust gas, and the other filter collects particulate matter in a heater. Energize to regenerate the filter. Therefore, in the diesel particulate filter, the effective utilization ratio of the filter that traps the particulate matter in the exhaust gas is as low as 50% in the system in which one filter is regenerated. In addition, the power consumption is large because the filter is regenerated, and the current power of the vehicle is insufficient.

Further, the filter used in the conventional diesel particulate filter is made of a ceramic fiber material and is formed into a shape that is bent in a cylindrical shape and has a large surface area, but the particulate matter is heated and burned. When the filter is heated, the ambient temperature of the filter rises, and the temperature rise causes the pleated cylindrical body to be thermally deformed. Therefore, in order to maintain its shape, the folded portion of the pleated filter must be reinforced with heat-resistant ceramics or the like. Not, again,
Since the filter has a cylindrical shape, the arrangement inside the housing becomes complicated, the number of filter parts increases, and the manufacturing cost increases.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems, and a filter for trapping particulate matter in exhaust gas is bent in a corrugated shape in the circumferential direction so as to form an overall cylinder. In order to maintain the shape of the cylinder formed on the body, the frame reinforcing member is incorporated in the filter,
The filter is prevented from being deformed by repeated heat loads, and the filters are respectively arranged in at least three compartments of the housing, and at least two filters trap particulate matter contained in the exhaust gas. Collects and increases the effective collection efficiency of the filter, heats and incinerates the particulate matter collected in the filter by energizing the heater, reduces the power consumption supplied to the heater, and shortens the heating and incineration of the filter. It is an object of the present invention to provide an exhaust gas purifying device configured to have a high-strength filter by reliably achieving all of the above and sequentially regenerating the filter and simplifying the entire structure.

According to the present invention, a housing connected to an exhaust pipe for discharging exhaust gas from an engine, and a particulate matter contained in the exhaust gas disposed in the housing are collected and collected. In an exhaust gas purifying apparatus having a filter for heating and incinerating particulate matter, the filter is formed into a cylindrical body by being bent in a corrugated shape in a circumferential direction from a ceramic non-woven fabric, a wire mesh and a heater, and the corrugated body of the cylindrical body is corrugated. A reinforcing member for a frame for reinforcing and holding the shape is provided, the reinforcing member being arranged at an end portion of the cylindrical body located on the exhaust gas inflow side of the housing and having an inner periphery of the cylindrical body on an outer periphery. A disk member provided with a protrusion having a shape corresponding to a side mountain portion, and an end portion and a length of the cylindrical body located on the exhaust gas outflow side of the housing. An exhaust gas purifying device, characterized in that it comprises a ring member having projections of a shape corresponding to the inner peripheral side ridge portions of the tubular body and the outer periphery are arranged in a predetermined position direction.

The reinforcing member is arranged between the disk member and the ring member, which are respectively arranged at the ends of the cylindrical body, and in a valley portion between the protrusions of the disk member and the ring member. Has a gutter-shaped frame. In particular, the gutter-shaped frame is made of a metal material having a small thermal expansion such as ferritic stainless steel in order to reduce the thermal expansion amount at least in the longitudinal direction. Further, the disk member and the ring member of the reinforcing member are made of a metal material such as austenitic stainless steel.

The disk member and / or the ring member fixed to the end portion of the filter is attached to the housing by a spring member or a link mechanism that allows thermal expansion of the filter.

The filter is embedded in the ceramic non-woven fabric having excellent heat resistance, the pair of metal nets for holding the ceramic non-woven fabric by sandwiching the ceramic non-woven fabric from the upstream and downstream directions of the exhaust gas, and the ceramic non-woven fabric. It is formed in a five-layer structure including the heater for incineration by heating the particulate matter collected in.

In this exhaust gas purifying apparatus, the housing is divided into at least three or more compartments by partition walls, and the filters are respectively arranged in the compartments so as to form exhaust gas passages inside and outside the compartments. An opening / closing valve for opening / closing an exhaust gas inlet of the chamber is arranged, and the opening / closing valve is controlled to be opened to feed the exhaust gas from the inlet side exhaust pipe to the compartment and the trapped by the filter. It has a controller for controlling the closing of the on-off valve and energizing the heater provided in the filter in order to heat and incinerate the particulate matter to regenerate the filter.

In this exhaust gas purifying apparatus, an inlet pipe that communicates with the exhaust pipe and forms a gas chamber for sending the exhaust gas to the compartment is connected to the housing, and the compartment of the housing is connected to the inlet pipe. Is connected to a collecting pipe for collecting the exhaust gas discharged from the compartment.

Since this exhaust gas purifying apparatus is constructed as described above, it is possible to prevent the filter from being thermally deformed by the heat load applied to the filter, and to always maintain a preferable corrugated shape, that is, a bellows shape, It is possible to always secure a large collection area for the particulate matter. Further, by forming the member located on the exhaust gas inlet side of the frame reinforcing member on the disk member and the member located on the exhaust gas outlet side on the ring member, both the function of reinforcing and the guide of the exhaust gas flow are achieved, and the exhaust gas is exhausted. The gas flows from the outside to the inside of the exhaust gas passage formed in the filter, so that a separate shielding plate for closing the inside of the end of the filter is not required.

Further, in this exhaust gas purifying device, the filters are arranged in three or more compartments divided by partition walls in the housing, and the on-off valves are arranged in the compartments, so one of them is arranged. It is possible to regenerate the filter, and to control the particulate matter in the exhaust gas with more than two filters, and to perform the alternate regeneration treatment of at least three filters with different clogging conditions due to the particulate matter. As a result, the effective collection efficiency of the filter that collects the particulate matter in the exhaust gas is increased, and the regeneration processing of one filter is performed, and the power consumption required to energize the heater is reduced. This can be reduced as compared with the conventional case where two filters are alternately reproduced. Further, since this exhaust gas purifying device performs the collection operation of the particulate matter by two out of three, the change in the pressure loss during the exhaust gas collection elapsed time is lower than that in the case of performing by one. , For example, 2
/ 3 or less, and even when the EGR process is performed to reduce the generation of NO _X , the fluctuation of the exhaust gas pressure can be significantly reduced, and therefore smooth EGR can be performed, and therefore, the particulate matter can be reduced. It is possible to efficiently collect NO _x and reduce the generation of NO _x due to EGR.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of an exhaust gas purifying device according to the present invention will be described below with reference to the drawings. This exhaust gas purifying apparatus has a filter 2 in which a particulate matter composed of carbon, soot, HC, SO _X, etc. contained in exhaust gas discharged from an engine is arranged in a housing 1.
The particulate matter trapped by the filter 2 is energized by heating the heater 6 provided in the filter 2 to incinerate it by heating, and the filter 2 is regenerated. is there.

As shown in FIGS. 1 and 4, in this exhaust gas purifying apparatus, a housing 1 has an inlet side exhaust pipe 11 into which exhaust gas from an engine flows and an outlet side exhaust pipe 12 from which purified exhaust gas is discharged. Connected to the inlet side exhaust pipe 11
Is installed by being connected to an exhaust pipe (not shown) through which exhaust gas generated by the engine is discharged. This exhaust gas purification device can be easily attached to the vehicle body or frame with a bracket or the like. For example, since it has a sound deadening function, it can be easily attached to the place where the muffler is installed instead of the muffler provided in the existing vehicle. You can also Further, it is needless to say that this exhaust gas purifying device can be easily constructed so that the outer surface of the housing 1 is a heat shield structure with a heat shield member or the like so that the vehicle is not damaged by heat.

As shown in FIG. 7, at least three housings 1 are provided by partition walls 4 (3 in FIGS. 2, 3 and 7).
The compartments 3 are divided into compartments 3 and the filters 2 are arranged in the compartments 3 so as to form the exhaust gas passages 33 on the outside thereof. The filter 2 has one end held by the filter holding pipe 71 in the housing 1, and the other end supported by the support member 47 in the housing 1 by screws 49 or the like. Further, in the exhaust gas passage 33 on the outside of the filter 2, a cylindrical reflecting plate 50 is arranged so as to be spaced from the outer peripheral surface of the filter 2 and supported by a supporting member 72. On the upstream side of the housing 1, an inlet pipe 7 (FIG. 5) is connected which communicates with the inlet side exhaust pipe 11 and forms a gas chamber 17 for sending the exhaust gas from the inlet side exhaust pipe 11 to the compartment 3. A collecting pipe 8 is connected to the compartment 3 of the housing 1 so as to communicate with the outlet side exhaust pipe 12 and collect exhaust gas discharged from the compartment 3 (FIG. 6). Further, on-off valves 5 for opening and closing the exhaust gas inlet 13 of the compartment 3 are arranged.

As shown in FIG. 8, the filter 2 holds the upstream ceramic non-woven fabric 27 and the downstream ceramic non-woven fabric 28, which have excellent heat resistance, and the ceramic non-woven fabrics 27, 28 by sandwiching them from the upstream and downstream directions of the exhaust gas flow. Arranged between a pair of upstream side wire net 29 and downstream side wire net 30, and between the upstream side ceramic non-woven fabric 27 and the downstream side ceramic non-woven fabric 28, in other words, the ceramic non-woven fabric 27, 28.
It is formed in a five-layer structure including a heater 6 such as a wire mesh heater embedded inside. Ceramics non-woven fabric 27, 28
By improving the durability by sandwiching it between the shape-retaining wire nets 29 and 30, and by constructing a five-layer structure, the collection efficiency per unit area of particulate matter such as soot and carbon can be improved. Can be up. Further, the heater 6 such as a wire mesh heater is attached to the ceramic non-woven fabric 2
The power can be effectively utilized by interposing between 7, 28, in other words, by embedding.

The ceramic non-woven fabrics 27 and 28 are made of at least silicon carbide non-woven fabric, and the fiber density of the upstream side portion of the exhaust gas flow, that is, the upstream side ceramic non-woven fabric 27 is rough, and the downstream side portion, that is, the downstream side ceramic non-woven fabric 2
The fiber density of 8 is densely formed. The ceramic nonwoven fabrics 27 and 28 are heat resistant ceramics such as silicon carbide (SiC), silicon nitride (Si ₃ N ₄ ), and alumina (Al ₂ O ₃ ).

In this exhaust gas purifying apparatus, in particular, as shown in FIG. 9, the filter 2 is formed into a tubular body 31 as a whole by bending it in a corrugated or bellows shape in its circumferential direction. As shown in FIGS. 12 to 16 and 17, a frame reinforcing member 35 for reinforcing and holding the corrugated shape of the tubular body 31 is incorporated. In FIG. 9, the end of the filter 2 is shown in an open state, but specifically, the inlet side of the compartment 3 is closed by the end plate 75, and the outlet side of the compartment 3 holds the filter. An annular ring 76 with an outlet 77 communicating with the pipe 71 closes the filter end face. The reinforcing member 35 is a disk member 40 arranged at the end 36 of the tubular body 31 located on the exhaust gas inflow side of the compartment 3 formed in the housing 1, and the compartment 3 formed in the housing 1.
Of the ring member 42 arranged at the end portion 37 of the tubular body 31 located on the exhaust gas outflow side of the exhaust gas passage 33, 34 (FIGS. 1 and 4) of the compartment 3 formed in the housing 1. Ring members 42 arranged at a plurality of predetermined positions in the direction,
And a trough-shaped frame 44 extending between a disk member 40 arranged at each of the ends 36 and 37 of the tubular body 31 and a ring member 42 of the end 37. The disk member 40 is shown in FIG.
4, a protrusion 39 having a shape corresponding to the inner peripheral peak 38 (FIG. 9) of the cylindrical body 31 of the filter 2 is provided on the outer periphery, and the ring member 42 is formed as shown in FIG. To
A protrusion 41 having a shape corresponding to the inner peripheral mountain portion 38 of the cylindrical body 31 is provided on the outer periphery. The gutter-shaped frame 44 is particularly shown in FIG.
As shown in FIG. 6, the disc member 40 and the ring member 42 are arranged in the valley portion 43 between the protrusions 39 and 41 and extend in the longitudinal direction.

The gutter-shaped frame 44 is made of a metal material having a small thermal expansion such as ferritic stainless steel in order to reduce the thermal expansion amount at least in the longitudinal direction.
Further, since the disk member 40 and the ring member 42 do not need to consider the thermal expansion amount in the longitudinal direction so much, the disk member 40 and the ring member 42 are made of a metal material such as austenitic stainless steel that has high strength at high temperature and is relatively inexpensive.

The frame reinforcing member 35 includes support members 47, 4
It is supported by the housing 1 by 8. For example, as shown in FIGS. 12 and 13, the disk member 40 and / or the disk member 40 fixed to the end portions 36 and 37 of the tubular body 31 forming the filter 2 are provided.
Alternatively, the ring member 42 is attached to the housing 1 by a support member 47 including a spring member 45 that allows thermal expansion of the filter 2. Alternatively, as shown in FIG. 17, the disc member 40 and / or the ring member 42 fixed to the ends 36, 37 of the tubular body 31 constituting the filter 2 are
The filter 1 is attached to the housing 1 by a support member 48 including a link mechanism 46 that allows thermal expansion of the filter 2. For example, as shown in FIG. 13, the support member 48 can stably support the frame reinforcing member 35 on the housing 1 by using a pair of rectangular ring-shaped spring members 45.

Generally, the engine exhaust gas temperature is 15
It is about 0 ° C to 650 ° C. When the filter 2 is regenerated, when the heater 6 is energized to heat and incinerate the collected particulate matter, the temperature of the filter 2 is 600 ° C.
Raise to ~ 800 ° C. At this time, the temperature of the housing 1 becomes 150 ° C. to 200 ° C. due to the heat reflecting action of the reflection plate 50. This exhaust gas purifying apparatus needs to satisfy the above temperature conditions, but the gutter-shaped frame 44 of the frame reinforcing member 35 incorporated in the filter 2 thermally expands in the longitudinal direction. In this exhaust gas purifying apparatus, in order to minimize the thermal expansion in the longitudinal direction of the gutter-shaped frame 44, the gutter-shaped frame 44 is made of the metal material having a small thermal expansion as described above, and the thermal reinforcement of the frame reinforcing member 35 is performed. A structure in which the frame reinforcing member 35 is supported on the housing 1 by a spring member 45 and a link mechanism 46 in order to allow a difference in expansion is adopted. The housing 1 is preferably made of austenitic stainless steel having a large coefficient of thermal expansion.

Further, since the controller 10 sends the exhaust gas from the inlet side exhaust pipe 11 to the compartment 3, the controller 10 controls the opening / closing valve 5 to open and heats and incinerates the particulate matter collected by the filter 2. In order to regenerate the filter 2, the on-off valve 5 is closed and the heater 6 provided in the filter 2 is energized. The heater 6 is energized by the control of the controller 10 from the power source such as the battery 51 through the energizing electrode 55 provided in the filter 2.

The controller 10 controls the trapping process for opening the open / close valves 5 of at least two compartments 3 to trap the particulate matter contained in the exhaust gas on the filter 2 and at least one compartment. The on-off valve 5 of the chamber 3 is closed and the heater 6 is energized to control the regeneration process of heating and incinerating the particulate matter trapped in the filter 2. These controls are performed as shown in FIG. Filter 2
Is set to sequentially control with respect to.
Electric power supplied to the heater 6 is supplied by, for example, a permanent magnet type generator 53 mounted on the vehicle. In response to the amount of particulate matter deposited on the filter 2, the controller 10 controls the opening / closing of the on-off valve 5 by the actuator 24 to control the sending of exhaust gas into the compartment 3.

The housing 1 includes, for example, the housing 1
A bypass passage 9 is formed by the partition wall 4 that forms the compartment 3 in the central portion of the. The bypass passage 9 is configured to open against the spring force of the spring 70 or the like when an exhaust gas pressure higher than a predetermined pressure is applied. The bypass passage 9 serves an emergency evacuation function and is opened by the safety valve 14. Therefore, for example, when the system of the controller 10, the sensor, the actuator, etc. fails, the vehicle is urgently sent to a repair place or the like. It can be moved. The housing 1 does not necessarily have to be provided with the bypass passage 9, but it is necessary to consider safety in case of emergency such as a safety valve. Further, when the bypass passage 9 is formed by the partition wall 4 in the central portion of the housing 1, the bypass passage 9 can be formed without increasing the overall size of the housing 1, and the waste space can be effectively utilized, and the device itself. Can be formed compactly.

In the compartment 3 formed in the housing 1,
Air supply means 15 is provided for supplying combustion air of the particulate matter when the filter 2 is regenerated.
The air supply means 15 is formed around the inlet 13 of the compartment 3 and is provided in the air passage 16 with a plurality of air outlets 68 that blow out combustion air radially to the compartment 3, and the air formed in the air passage 16 It has an air pump 18 for sending combustion air to the air passage 16 through the inlet 69, and an air distribution valve 19 for controlling the supply of combustion air to the air inlet 69. The air distribution valve 19 may be a triple solenoid valve or the like, and is configured to supply air to one compartment 3. When the filter 2 is regenerated, the combustion air is opened by the operation of the air pump 18 by the air distribution valve 19 to open the air inlet 69 that communicates with the compartment 3 at the time of regeneration, and through the air inlet 69, the air passage 16 of the predetermined compartment 3 is opened. To the exhaust gas passage 33 in the compartment 3 from the air outlet 68 provided in the air passage 16.

The housing 1 has a substantially cylindrical outer shape, and the filters 2 arranged in the compartments 3 respectively.
Is formed in a tubular shape. The exhaust gas flowing from the gas chamber 17 into the compartment 3 flows from the outer side to the inner side of the filter 2 and is exhausted to the outlet side exhaust pipe 12 through the collecting pipe 8. The on-off valve 5 is composed of a valve body 20 that opens and closes the exhaust gas inlet 13 of the compartment 3, and a drive motor 22 that opens and closes the valve body 20 by a link mechanism 21 and an actuator 24 that includes a speed reducer 23. ing. Since it is necessary to overcome the exhaust gas pressure to open and close the on-off valve 5, the actuator 24 increases the torque of the drive motor 22 through the speed reducer 23, and thereby the link mechanism 21.
Is operated to open the exhaust gas inlet 13 of the valve body 20.

The exhaust pipe 11 on the inlet side is provided with a temperature sensor 25 such as a thermocouple for detecting the temperature of the exhaust gas fed into the compartment 3 of the housing 1, and a pressure sensor 26 for detecting the pressure. ing. The temperature sensor 25 measures the temperature of the exhaust gas, and the controller 10 determines the filter 2 from the result of the exhaust gas temperature, the detected value of the pressure sensor 26 and the engine rotation speed measured by the rotation sensor 72 of the generator or the engine. It is possible to calculate the clogging rate of the particulate matter collected in the above, that is, the collection amount, and command the regeneration timing of the filter 2. Others, for example,
In order to measure the temperature of the filter 2, the temperature sensor 74 can be arranged along the high temperature region of the bent portion of the bellows of the filter 2, which is the highest temperature region of the filter 2. The temperature in the entire area of the filter 2 is substantially adjusted to a temperature equal to or lower than the temperature detected by the temperature sensor 74, and the amount of electricity supplied to the heater 6 during regeneration of the filter 2 and the amount of air supply of the air pump 18 are controlled to control the filter 2 Is prevented from being damaged by local overheating or the like. The controller 10 controls opening / closing of the opening / closing valve 5 in response to detection signals from the temperature sensors 25, 74, the rotation sensor 73, the pressure sensor 26, etc., controls the energization of the heater 6, and further supplies it to the compartment 3. The air supply means 15 is controlled to supply the combustion air. Also,
The controller 10 includes information on the temperature sensors 25 and 74, the rotation sensor 73, the pressure sensor 26, the battery 51, the power supply control device 52, the permanent magnet generator 53, etc., or the filter 2
Is playing, and trouble information indicator 54
Is configured to display. The generator 53 can be the one mounted on the vehicle, but another generator can be additionally mounted.

The filter 2 is arranged in the housing 1 so as to extend in the longitudinal direction from one side of the housing 1 to the opposite side thereof in a direction intersecting with the flow of exhaust gas. In addition, the filter 2 is bent as a whole in the circumferential direction in a bellows shape or a corrugated shape to form an exhaust gas passage 34 inside in order to increase a surface area in contact with exhaust gas, that is, a collecting area. 31 is compactly formed. The exhaust gas flows from the outer peripheral side to the inner peripheral side of the cylindrical body 31, and the particulate matter contained in the exhaust gas is collected by the filter 2. The exhaust gas passes from the exhaust gas passage 33 on the outer peripheral side of the filter 2 to the exhaust gas passage 3 on the inner peripheral side of the filter 2.
Since it is configured so as to flow to the filter 4, bulging in the radial direction due to exhaust gas heat of the filter 2 is prevented. Also,
The cylindrical body 31 forming the filter 2 has a plurality of shape-fixing rings 32 arranged on the inner and outer circumferences thereof at a plurality of positions in the longitudinal direction.

This exhaust gas purifying apparatus is constructed as described above, and the exhaust gas is sent from the inlet side exhaust pipe 11 through the inlet pipe 7 to two of the three compartments 3,
The particulate matter contained in the exhaust gas is trapped by the filter 2 when being sent to the filter 2 arranged in the compartment 3 and passing through the filter 2. One of the three compartments 3 is closed by the on-off valve 5, the heater 6 is energized, and the particulate matter collected in the filter 2 is heated and incinerated to purify the exhaust gas. 8 is discharged to the outlet side exhaust pipe 12. Therefore,
As shown in FIG. 11, this exhaust gas purifying apparatus reduces the pressure loss YmmHg in the elapsed time to 2/3 or less as compared with the pressure loss XmmHg in the elapsed time due to the alternating operation of two conventional filters. can do.

In order to prevent the filter 2 from overheating, the controller 10 controls the energization of the heater 6 in response to the temperature detected by the filter 2 from the temperature sensor 74, and the drive motor 22 for driving the air pump 18. The operation is controlled to adjust the supply amount of exhaust gas and air into the exhaust gas passage 33. The controller 10 regenerates the filter 2, for example, when the temperature sensor 74 indicates a high temperature,
The rotation speed of the motor 22 is reduced to send a small amount of air to the filter 2 to reduce the combustion speed of the particulate matter trapped in the filter 2 and suppress the temperature rise of the filter 2.

The controller 10 detects the pressure value detected by the pressure sensor 26, the engine rotation speed by the rotation sensor 73, and the exhaust gas temperature by the temperature sensor 25, or detects the exhaust gas temperature of the filter 2 by the pressure sensor. If it becomes larger than a predetermined pressure value or a pressure difference determined in advance by the pressure difference due to the pressure value, the filter 2
It is recognized that the particulate matter trapped in the filter has reached a predetermined trapping amount, the regeneration is started in response to the pressure value or pressure difference, and then the particulate matter deposited on the filter 2 is started. Heater 6 to heat and incinerate
Control to energize. Further, the controller 10 controls the operation of the air pump 18 and the operation of the actuator 24 that opens and closes the open / close valve 5 in response to the regeneration of the filter 2. Further, the controller 10 responds to the operating state of the engine such as the engine speed detected by the rotation sensor and the engine load detected by the load sensor, in response to the air pump 1
8 control the operating state.

[0037]

Since the exhaust gas purifying apparatus according to the present invention is configured as described above, the frame reinforcing member can always hold the filter in a shape having a large collecting area. Further, the frame reinforcing member can be configured to have an extremely compact and strong structure. Also,
By supporting the frame reinforcing member to the housing with a spring member or a link mechanism, the thermal expansion difference can be allowed even when the filter is regenerated at a high temperature, and the filter shape can always be maintained in a good state. . Further, this exhaust gas purifying device can be easily attached not only to a new vehicle but also to an existing vehicle as a muffler mounting structure or as a muffler having a muffling function. In this exhaust gas purification device, filters are arranged in at least three compartments, respectively, and the particulate matter in the exhaust gas is collected by at least two filters, so the collection effective utilization rate of the filters is increased, Further, since the filter is regenerated by one filter, the electric power used is low, the filter can be regenerated, and it is extremely preferable to be mounted on a vehicle or the like where the electric power is easily insufficient.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an embodiment of an exhaust gas purifying device according to the present invention.

FIG. 2 is a side view showing a front end of the exhaust gas purification device of FIG.

FIG. 3 is a side view showing a rear end of the exhaust gas purification device of FIG.

FIG. 4 is a schematic sectional view showing an embodiment of an exhaust gas purification device according to the present invention.

FIG. 5 is a perspective view showing an inlet pipe attached to a housing in the exhaust gas purification device.

FIG. 6 is a perspective view showing a collecting pipe attached to a housing in the exhaust gas purification device.

FIG. 7 is a perspective view showing an arrangement state in which filters are respectively arranged in compartments of a housing in this exhaust gas purification device.

FIG. 8 is an explanatory diagram showing a filter having a five-layer structure in this exhaust gas purification device.

FIG. 9 is a perspective view showing a filter in this exhaust gas purification device.

FIG. 10 is a diagram illustrating a regeneration cycle of three filters in this exhaust gas purification device.

FIG. 11 is a diagram showing pressure loss with respect to elapsed time for a filter.

FIG. 12 is a cross-sectional view showing an example of the overall structure in which a frame reinforcing member provided in a filter is supported by a housing via a spring member.

13 is an explanatory view showing a state in which the frame reinforcing member of FIG. 12 is supported by a housing via a spring member.

FIG. 14 is a front view showing a disk member in the frame reinforcing member.

FIG. 15 is a front view showing a ring member in the frame reinforcing member.

FIG. 16 is a perspective view showing the overall structure of a frame reinforcing member.

FIG. 17 is a cross-sectional view showing another embodiment of the overall structure in which the frame reinforcing member provided in the filter is supported in the housing through the link mechanism.

[Explanation of symbols]

1 housing 2 filters 3 compartments 4 partitions 5 on-off valve 6 heater 7 Inlet pipe 8 collecting pipe 10 controller 11 Inlet side exhaust pipe 12 Outlet side exhaust pipe Exhaust gas inlet of 13 compartments 17 gas chamber 27 Ceramics non-woven fabric (upstream side) 28 Ceramics non-woven fabric (downstream side) 29 Wire mesh (upstream side) 30 wire mesh (downstream side) 31 cylinder 33 Exhaust gas passage on outer peripheral side of filter 34 Exhaust gas passage on inner side of filter 35 Reinforcing member for frame 36 End (Cylinder) 37 End (Cylinder) 38 Inner peripheral side mountain part 39 Projection (disk member) 40 disk members 41 Protrusion (ring member) 42 Ring member 43 Valley (between protrusions) 44 gutter frame 45 Spring member 46 Link mechanism 47 Support member (spring member) 48 Support member (link member)

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) B01D 39/20 ZAB B01D 39/20 ZABD // B01D 46/42 46/42 BF term (reference) 3G090 AA02 AA04 BA04 CA00 CA03 CA04 CB00 CB11 CB14 CB22 CB23 DA12 DA13 DA18 DA20 EA01 4D019 AA01 BA05 BB03 BC11 CA02 CB04 CB09 4D058 JA10 MA42 SA08

Claims (8)

[Claims] 1. A housing connected to an exhaust pipe for discharging exhaust gas from an engine, and a particulate matter contained in the exhaust gas, which is disposed in the housing, and the particulate matter collected. In an exhaust gas purifying apparatus having a filter for heating and incinerating a substance, the filter is bent in a corrugated shape in the circumferential direction from a ceramic non-woven fabric, a metal net, and a heater, and is formed into a tubular body as a whole. It has a frame reinforcing member for reinforcing and holding, and the reinforcing member is
A disk member, which is disposed at an end portion of the cylindrical body located on the exhaust gas inflow side of the housing and has a protrusion on the outer periphery, the protrusion having a shape corresponding to the inner peripheral side mountain portion of the cylindrical body, and the housing. A ring member, which is disposed at an end portion of the cylindrical body located on the exhaust gas outflow side and at a predetermined position in the longitudinal direction, and has a protrusion portion having a shape corresponding to the inner peripheral side mountain portion of the cylindrical body on the outer periphery. An exhaust gas purification device characterized by having. 2. The reinforcing member is provided between the disk member and the ring member, which are respectively arranged at the end portions of the cylindrical body, and between the disk member and the ring member, and a valley portion between the protrusions. The exhaust gas purifying apparatus according to claim 1, wherein the exhaust gas purifying apparatus has a gutter-shaped frame disposed in the. 3. The gutter-shaped frame is made of a metal material having a small thermal expansion such as ferritic stainless steel in order to reduce the amount of thermal expansion in at least the longitudinal direction. Exhaust gas purification device. 4. The exhaust gas purifying apparatus according to claim 2, wherein the disk member and the ring member of the reinforcing member are made of a metal material such as austenitic stainless steel. 5. The disk member and / or the ring member fixed to the end portion of the filter is attached to the housing by a spring member or a link mechanism that allows thermal expansion of the filter. The exhaust gas purifying device according to any one of claims 1 to 4. 6. The filter is embedded in the ceramic non-woven fabric having excellent heat resistance, the pair of wire nets for sandwiching and holding the ceramic non-woven fabric from the upstream and downstream directions of the flow of the exhaust gas, and the ceramic non-woven fabric. The exhaust gas purification according to any one of claims 1 to 5, characterized in that the exhaust gas purification is formed in a five-layer structure including the heater for heating and incinerating the particulate matter trapped in the filter. apparatus. 7. The housing is divided into at least three or more compartments by partition walls, and the filters are arranged in the compartments so as to form exhaust gas passages on the inner and outer circumferences thereof, respectively. Opening / closing valves for opening and closing the exhaust gas from the exhaust pipe are sent to the compartment, and the opening / closing valve is controlled to open and the particulate matter collected in the filter is incinerated by heating. The exhaust gas purification according to any one of claims 1 to 6, further comprising: a controller that controls the closing of the on-off valve to regenerate the filter, and energizes the heater provided in the filter. apparatus. 8. An inlet pipe, which communicates with the exhaust pipe and forms a gas chamber for sending the exhaust gas to the compartment, is connected to the housing, and the compartment of the housing is connected to the compartment from the compartment. 8. A collecting pipe for collecting the exhaust gas to be sent out is connected.
Exhaust gas purifier according to.