JP3306026B2 - Diesel particulate filter device comprising a cylindrical filter with a frame support - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diesel particulate filter device provided with a cylindrical filter provided with a framework support for collecting particulates contained in exhaust gas discharged from an engine.

[0002]

Conventionally, a diesel particulate filter device, suspended matter contained in the exhaust gas exhausted from an engine such as a diesel engine, carbon, smoke, HC, is intended to remove particulates consisting SO _X or the like Are known. This type of filter generally regenerates the filter by heating and burning the particulate using a heat source when the particulate is collected and the filter is clogged. In the diesel particulate filter device, a pair of filters are disposed in parallel in an exhaust gas passage to collect the particulates, and one of the filters collects the particulates, and the collected particulates exceed a predetermined amount. Then, the flow of the exhaust gas is switched to collect the particulates with the other filter, and the particulates collected by the filter are heated and incinerated to regenerate the filter (for example, Japanese Patent Application Laid-Open No. 7-279646, See JP-A-8-313329).

[0003]

In a diesel particulate filter device, when the particulates are heated and incinerated in order to regenerate the filter that has trapped the particulates, the exhaust gas is being regenerated from the exhaust pipe upstream of the filter. It is necessary to heat and incinerate the particulates by supplying oxygen to the heater by supplying electricity to the heater and using oxygen in the exhaust gas, or heat and incinerate the particulates by introducing air from the outside to the filter being regenerated. .
When heating and burning the particulates by energizing the heater,
Normally, the entire structure of the filter is large, so that a large current is required for energizing the heater. However, it is desired to reduce the current as much as possible and regenerate the filter with a small current.

[0004] The diesel particulate filter device has, for example, a cylindrical housing connected to an exhaust pipe through which exhaust gas discharged from the engine flows, and a cylindrical filter arranged in the housing. The cylindrical filter is
The filter body is composed of a filter body made of a laminated material in which ceramic fiber materials are laminated, a wire mesh heater arranged in contact with the filter body, and a skeleton support for maintaining the shape of the filter body. When regenerating the filter body, the heat radiated from the filter body is radiated to the outer housing. The housing receives the radiant heat from the filter body and rises in temperature, and the heat is transmitted to the pipe joint connecting the exhaust pipe and the housing. Therefore, minimizing the heat transferred from the housing to the exhaust pipe and the heat radiated from the housing reduces the power used to regenerate the filter body.

[0005] Further, in a diesel particulate filter device, when the particulate matter collected in the filter main body is heated and incinerated, the shape of the filter main body cannot be maintained because the heat generated in the filter main body cannot maintain the shape of the filter main body. In order to form the filter body, it is necessary to dispose a skeleton support in the filter body. However, since the skeleton support also has a complicated shape and the manufacturing cost is high, the skeleton support incorporated in the filter body has a simple structure and low cost. The issue is how to manufacture at cost.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and the particulate matter contained in exhaust gas discharged from an engine is collected by a filter arranged in a housing. In a diesel particulate filter device that regenerates a filter by heating and burning the particulates collected by the filter, the heat insulation of the housing is improved to reduce the power consumed for regenerating the filter, and the filter generates It is an object of the present invention to provide a diesel particulate filter device which can simplify the structure of a skeleton support for preventing the shape of a filter main body from being thermally deformed due to heat generated and can be manufactured at low cost.

According to the present invention, there is provided a cylindrical housing connected to an exhaust pipe through which exhaust gas discharged from an engine flows, and disposed inside the cylindrical housing so as to form an exhaust gas passage inside and outside, and in the exhaust gas. In a diesel particulate filter device including a cylindrical filter for collecting contained particulates, the cylindrical filter includes:
A cylindrical filter main body having a fold folded in a bellows shape in a circumferential direction, a heater arranged in contact with the filter main body for heating and burning the particulates collected by the filter main body, and the filter main body And a skeleton support disposed inside the filter body to maintain the shape of the filter body, and the skeleton support is disposed inside the filter body and is sequentially spaced in the circumferential direction in the axial direction. A diesel particulate filter comprising: a tubular porous plate having a formed slit; and a ring member having a support rod penetrating through the slit of the tubular porous plate and entering the fold of the filter body. Related to the device.

[0008] The cylindrical filter is provided between the supporting rods adjacent in the circumferential direction and between the outer surface of the cylindrical porous plate and the fold of the filter main body. The heat insulator plates extending in the axial direction are sequentially arranged. Further, the heat insulator plate is formed of a heat-resistant metal material made of ceramics such as alumina, silicon nitride, silicon carbide, or a steel material containing nickel, chromium, or the like. By disposing the heat insulator plate on the folds of the filter body, the amount of particulates deposited on the valleys of the folds can be reduced, and abnormal overheating at the valleys can be prevented.
Further, the heat insulator plate has Ni,
By plating with Cr or the like, the radiation effect is improved on the plated layer.

The cylindrical perforated plate is formed by forming a perforated flat plate having perforations having a predetermined width and having the slits sequentially formed in the length direction at intervals in the width direction into a cylindrical shape. Things. Also, the ring member is
It is formed by forming a flat plate member with a support rod, which is a zigzag cut flat plate having a predetermined width leaving both side edges, into a cylindrical shape. When the ring member is zigzag cut as described above, two flat plate members with support rods are formed, and the loss of the material removed from the flat plate can be significantly reduced, and the manufacturing cost can be reduced.

Further, the fitting of the support rod of the ring member to the slit of the cylindrical porous plate is performed by fitting the support rod of the flat plate member with the support rod to the slit of the porous flat plate. It is formed by forming the cylindrical member into a cylindrical shape while fitting the edge of the flat plate member with the support rod into the groove formed in the circumferential direction of the shape forming die.

The cylindrical housing is formed of a laminated cylindrical body made of a plurality of thin plate members, and at least one cylindrical wire mesh member forming a heat shielding air layer disposed between the cylindrical bodies. The openings at both ends between the bodies are sealed. Further, the cylindrical housing has a heat shield layer made of a heat-resistant metal coated with an aluminum-based metal material on the inner surface side of the cylindrical body. For example, the housing is made up of three sheets
If it comprises from the said wire mesh member, two places of the heat shielding air layer will be formed between the said sheet materials by two wire mesh members,
Heat transfer paths from gas to solid and solid to gas are formed at six locations including the inner and outer surfaces of the housing, and the heat transfer rate is greatly reduced (for example, 1/3 to 1/5). Become. Further, by forming the heat shield layer on the inner surface side of the cylindrical member, radiant heat is reduced, and heat dissipation to the outside is greatly reduced.

The filter main body is formed of a laminated material in which ceramic fibers are randomly laminated. The heater is arranged in contact with the outer surface of the filter body.

In this diesel particulate filter device, the exhaust gas flowing into the cylindrical housing from the exhaust pipe flows from the exhaust gas passage outside the cylindrical filter to the inside of the exhaust gas passage, and The wire mesh forming the heater is disposed on the upstream side of the exhaust gas flow of the filter body.

In this diesel particulate filter device, since the housing is configured as described above, the heat generated by the regeneration of the filter body is less transmitted from the housing to the exhaust pipe, and the heat radiation from the housing is reduced. The power for regeneration of the filter body can be reduced, and an energy-saving filter can be provided. In addition, a commercially available punched metal having a large number of holes can be used as a perforated flat plate of the material for the frame support for retaining the shape of the filter body, so that the material can be prepared at a low cost. Since a flat plate having a predetermined width is formed by zigzag cutting while leaving both side edges, two flat plate members with a support rod can be formed with one flat plate, and the material is cut off. Because the number of parts to be eliminated can be reduced, the material can be provided at low cost.

Further, as described above, the skeleton support can be easily manufactured only by fitting the support rod of the flat plate member into the slit formed in the perforated flat plate and molding it into a cylindrical shape. Therefore, the frame support for preventing the shape of the filter from being thermally deformed by the heat generated by the regeneration of the filter can be formed in an extremely simple and strong structure, and the manufacturing cost of the frame support can be greatly reduced.

Also, in this diesel particulate filter device, during regeneration of the filter, a large amount of particulates is deposited in the valley outside the fold of the filter body, so that the wire mesh heater is energized to raise the filter body. When heated, the wire mesh heater is close to the valley of the filter body, so the temperature tends to be high. However, in order to cut off the transmission and radiation of heat from the high temperature part, the heat insulator plate is placed at the valley of the fold. It is arranged corresponding to the inside to block the transmission and radiation of heat from the high-temperature section.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a diesel particulate filter device according to the present invention will be described below with reference to the drawings. FIG. 1 is a schematic explanatory view schematically showing a diesel particulate filter device according to the present invention, and FIG.
2 is a sectional perspective view showing a cylindrical filter and a housing in the diesel particulate filter device of FIG. 1, FIG. 3 is a partial sectional view showing the structure of the housing of FIG. 2, and FIG. 4 is incorporated in the cylindrical filter of FIG. FIG. 5 is a perspective view showing a part of the skeleton support of FIG. 4, FIG. 6 is a plan view showing a material of a tubular porous plate of the skeleton support, FIG.
8 is a plan view showing a material of a ring member of the skeleton support, and FIG. 8 is an explanatory view showing a manufacturing process of the skeleton support of FIG.

This diesel particulate filter device is connected to an exhaust pipe 10 connected to an exhaust manifold of a diesel engine. Exhaust pipe 10
Is connected to a pair of branch passages 11 and 12 branched at the inlet side exhaust gas passage. In the branch passages 11 and 12, cylindrical filters 1 for collecting particulates contained in exhaust gas are arranged in parallel. In order to heat and incinerate the collected particulates, the cylindrical filter 1 has an upstream wire mesh 39 functioning as a heater provided on the cylindrical filter 1 and a downstream side for holding the cylindrical filter 1. Is provided. One of the wire meshes 39 and 40 functions as a heater when the filter is regenerated. In this embodiment, the upstream wire mesh 39 is configured to function as a heater.
Further, a switching valve 9 that is switched at a branch portion of the branch passages 11 and 12 to flow exhaust gas to one of the branch passages 11 and 12 is provided. The downstream side of the cylindrical filter 1 communicates with an outlet-side exhaust gas passage 17 where the outlet-side branch passages 13 and 14 are gathered together. The outlet side exhaust gas passage 17 is open to the atmosphere, for example, so as to discharge the exhaust gas to the outside, and the exhaust gas is at atmospheric pressure.

A pressure sensor 26 for detecting the exhaust gas pressure is provided in the exhaust gas passage on the inlet side of the exhaust pipe 10.
In some cases, a pressure sensor 41 for detecting the exhaust gas pressure is also provided in the outlet-side exhaust gas passage 17. Furthermore,
A temperature sensor 44 for detecting the exhaust gas temperature is provided in the exhaust gas passage on the inlet side of the exhaust pipe 10 on the upstream side of the cylindrical filter 1. In the diesel particulate filter device, when the filter 1 is regenerated, the pump 55 drives the exhaust gas containing oxygen from the outlet-side exhaust gas passage 17 through the exhaust gas passage 56 to introduce the exhaust gas 57 or 5.
The opening / closing operation of the valve 8 causes the exhaust gas passage 59 or 60 to supply the fuel to the branch passage 11 or 12.

The cylindrical filter 1 has a housing 5 disposed in the branch passages 11 and 12, a filter body 3 for collecting particulates contained in exhaust gas disposed in the housing 5, and a filter body 3 for collecting exhaust gas. The filter body 3 is composed of an upstream wire mesh 39 of the heater wire mesh disposed on the upstream side, a filter 1 made of a laminated material of ceramic fibers, and a downstream wire mesh 40 holding a ceramic fiber material. The filter body 3 is, for example, folded in a pleated shape and formed in a cylindrical shape as a whole. Shielding plates 27 and 28 are attached to both ends of the filter body 3. The exhaust gas flowing into the filter 1 from the branch passages 11 and 12 flows from the exhaust gas passages 7 and 8 between the housing 5 and the filter body 3 to the central exhaust gas passages 37 and 38 of the filter body 3 as shown by arrows. It is configured to be sent out from the outer peripheral side to the inner peripheral side.

The filter body 3 is made of a heat-resistant and oxidation-resistant SiC, Si ₃ N ₄ , or Al coated with SiC.
_{It is} made of a laminated material in which ceramic fiber non-woven fabrics made of ₂ O ₃ , Si ₃ N _{4 and the} like are randomly laminated, and other uniform materials can be made of fiber materials such as ceramic woven cloth and ceramic felt. As the fiber material, not only a single filament material can be used, but also a non-woven fabric laminated with feathered fiber laminated fiber material and / or crimped ceramic long fiber.
Alternatively, it can be constituted by a nonwoven fabric in which laminated fiber materials of crown feather-like fibers and / or crimped ceramic long fibers are laminated.

The controller 25 detects the accumulation state of the particulates in the filter 1, operates the actuator 16 for switching the switching valve 9, supplies electricity from the power supply 43 to the upstream wire mesh 39, and regenerates exhaust gas during regeneration. Of the pump 55 for sending the filter 1 to the filter 1 and the switching operation of the introduction valves 57 and 58 for sending the exhaust gas to the filter 1 on the regeneration side. In this diesel particulate filter device, detection signals obtained from a rotation sensor 21 for detecting an engine rotation of a diesel engine, a load sensor 22 for detecting an engine load, and a pressure sensor 26 for detecting an exhaust gas pressure flowing through the exhaust pipe 10 are as follows: Input to the controller 25. The controller 25 controls the operation of the actuator 16 and the upstream wire mesh 39 according to the information from the sensors 26, 41, and 44. Alternatively, the controller 25 controls the exhaust pipe 1 on the upstream side of the cylindrical filter 1.
Temperature sensor 44 for detecting exhaust gas temperature
Each device may be configured to be controlled in accordance with the detection signal. In this case, the exhaust gas temperature is correlated with the magnitude of the engine load. The higher the engine load and the higher the exhaust gas temperature, the lower the O ₂ concentration.

This diesel particulate filter device collects particulates such as carbon, soot, and HC contained in exhaust gas that alternately passes through the cylindrical filter 1. In response to the collection of particulates equal to or greater than a predetermined amount, the upstream wire mesh 39 is energized to function as a heater, and the pump 55 is operated to open the introduction valve 57 or 58, thereby regenerating. The exhaust gas for oxygen supplementation is taken in from the exhaust gas passage 17 on the outlet side, and the particulate matter collected by the tubular filter 1 is controlled so as to regenerate the tubular filter 1 by heating and burning. Further, the upstream wire mesh 39 as a heater can be configured to be able to conduct electricity in the circumferential direction of the filter body 3. The upstream metal mesh 39 is provided with electrode terminals 23 and 24 at both ends in the circumferential direction for energization. As the upstream wire mesh 39, one having a uniform pitch, that is, the number of meshes in the entire region in the axial direction can be used.

In this diesel particulate filter device, a pressure sensor 26 for detecting exhaust gas pressure is provided in the exhaust pipe 10 on the upstream side of the branch passages 11 and 12, and in some cases, on the downstream side of the cylindrical filter 1. May be provided with a pressure sensor 41 for detecting the exhaust gas pressure. The detected value of the exhaust gas pressure by the pressure sensor 26 is input to the controller 25. Exhaust pipe 1
A switching valve 9 that is actuated by an electromagnetic or hydraulic actuator 16 in accordance with a command from a controller 25 is provided at a branch point that branches from 0 to a pair of branch passages 11 and 12. The switching valve 9 is operated by an actuator 16 to flow exhaust gas to one or both branch passages 11 and 12. The controller 25 receives the detection signal of the exhaust gas pressure from the pressure sensor 26, performs the switching operation of the switching valve 9, and regenerates the cylindrical filter 1 to be regenerated.
Of the upstream wire net 39 is operated.

This diesel particulate filter device is particularly characterized by the structure of the cylindrical housing 5 and the structure of the cylindrical filter 1 as shown in FIGS. As shown in FIGS. 2 and 3, the cylindrical housing 1 has a laminated structure including a plurality of thin plates and a wire mesh.
The outer cylinder 2, which is in contact with the outside air, the inner cylinder 6, into which the exhaust gas flows, the intermediate cylinder 4, between the outer cylinder 2 and the inner cylinder 6,
An outer tubular wire mesh member 45 between the outer tubular body 2 and the intermediate tubular body 4;
And an inner cylindrical wire mesh member 4 between the inner cylinder 6 and the intermediate cylinder 4
6. Further, on the inner surface side of the inner cylinder body 5 in contact with the exhaust gas, a heat shielding layer 42 made of a steel material coated with an aluminum-based metal is formed in order to reduce radiant heat and greatly reduce heat dissipation to the outside. I have. Furthermore,
In the space where the wire mesh members 45 and 46 are arranged, heat shielding air layers 47 and 48 are formed so that heat transfer to the outside is inhibited. In addition, since the wire mesh members 45 and 46 intersect the wires in the vertical and horizontal directions, the overlapping portion of the wires is thick and makes point contact with the cylinders 2, 4, and 6, and the contact area with the cylinder is greatly increased. And stop the air movement in the formation. For example, when the housing 5 is configured as described above, two heat shielding air layers 47 and 48 are formed between the thin plates by the two wire mesh members 45 and 46, and the gas → solid and the solid → gas are formed. Are formed at six locations including the inner and outer surfaces of the housing 5, and the heat transfer rate is greatly reduced (for example, 1/3 to 1/5). Further, by forming the heat shield layer on the inner surface side of the cylindrical member, radiant heat is reduced, and heat dissipation to the outside is greatly reduced.

Further, the cylindrical filter 1 is provided with a cylindrical filter body 3 having a fold 34 bent in a bellows shape in the circumferential direction. The filter body 3 for heating and burning the particulates collected by the filter body 3. The wire mesh 39 arranged on the upstream side in contact with the filter, the downstream wire mesh 40 arranged on the downstream side in contact with the filter body 3, and the skeleton support arranged inside the filter body 3 to maintain the shape of the filter body 3 It has a body 15. The frame support 15 is provided with the filter body 3.
The cylindrical perforated plate 18 is provided with a slit 29 which is arranged in a valley portion 36 inside the fold portion 34 and is formed in the circumferential direction so as to be spaced apart in the axial direction, and passes through the slit 29 of the cylindrical perforated plate 18 The support rod 20 that enters the fold 34 of the filter body 3
Is provided.

Further, between the support rods 20 adjacent in the circumferential direction, the outer surface of the cylindrical porous plate 18 and the folds 34 of the filter body 3
A heat insulator plate 30 extending in the axial direction of the fold portion 34 of the filter body 3 is sequentially disposed between the two.
The heat insulator plate 30 is made of ceramics such as alumina, silicon nitride, silicon carbide, or the like, or a heat-resistant metal material made of a steel material containing nickel, chromium, or the like.

As shown in FIG. 6, the cylindrical porous plate 18 is provided with a porous plate 31 having a predetermined width, and is formed by forming a porous flat plate 32 in which slits 29 are sequentially formed in the length direction at intervals in the width direction. It is formed by molding. Perforated flat plate 32
For example, a commercially available punched metal board having a large number of holes 31 can be used. As shown in FIG. 7, the ring member 19 is a flat plate 33 having a predetermined width.
Are formed by forming a pair of zigzag flat plate members 52 with support rods into cylindrical shapes while leaving both side edges. At this time, the size of the portion 53 cut off from the flat plate 33 is determined by the width of the support rod 20.
A pair of flat members 52 with support rods are formed from
Materials can be used effectively and waste is reduced.

As shown in FIG. 8, for example, the skeleton support 15 can be formed by using a cylindrical cylindrical forming die 50 having a groove 51. The frame support 15 is formed by fitting the support rods 20 of the flat plate member 52 with support rods into the slits 29 of the porous flat plate 32 and forming the cylindrical forming die 50.
Is formed by forming a cylindrical shape while fitting the edge 54 of the flat plate member 52 with a support rod into the groove 51 formed in the circumferential direction. At this time, if the notch 49 is formed along the edge 54 of the flat plate member 52 in order to facilitate the formation of the flat plate member 52 with the support rod into a cylindrical shape, the flat plate member 52 can be easily formed into a cylindrical shape. In some cases, the frame support 15 may be formed by, for example, forming the flat plate member 5 in addition to the above-described processing.
The support rod 20 may be bent at 90 °, the bent support rod 20 may be fitted into the slit 29 of the perforated flat plate 32, and then the flat plate member 52 and the perforated flat plate 32 may be bent together into a cylindrical shape to be formed. it can.

Since the diesel particulate filter device is configured as described above, it operates as follows. By the operation of the diesel engine, the switching valve 9 opens the branch passage 11 and closes the branch passage 12, for example, as shown in FIG. Exhaust gas from the diesel engine flows from the exhaust manifold into the branch passage 11 through the exhaust pipe 10, and the particulates contained in the exhaust gas are collected by the filter 1. The exhaust gas pressure signals from the pressure sensors 26 and 41 are
5, the controller 25 calculates the pressure ratio of the exhaust gas pressure between the upstream side and the downstream side of the filter 1. When the filter 1 is clogged, that is, when the particulates accumulated on the filter 1 reach a predetermined amount, the filter 1
The pressure ratio between the exhaust gas pressure on the upstream side and the exhaust gas pressure on the downstream side reaches a predetermined value. When the pressure ratio reaches a predetermined value, the actuator 16 is operated by the command of the controller 25, the switching valve 9 is switched, and the exhaust gas from the diesel engine 1 flows through the exhaust pipe 10 into the branch passage 12. Become.

While the exhaust gas is flowing into the branch passage 12, the flow of the exhaust gas from the exhaust pipe 10 into the branch passage 11 is blocked, but a small amount of the exhaust gas flows through the switching valve 9. Once you have, O ₂ contained in the exhaust gas
By utilizing the above, not only can the particulates deposited on the filter 1 be incinerated by heating, but also the burning rate can be reduced, so that the life of the filter 1 can be extended. Of course, although not shown, the controller 25 operates the pump 55 to supply the exhaust gas containing O ₂ for regenerating the filter 1 to the filter 1 to operate the pump 55 at atmospheric pressure through the outlet-side exhaust gas passage 17. The exhaust gas may be sent to the branch passage 11. The upstream wire mesh 39 or the downstream wire mesh 40 is energized to function as a heater, and the particulates collected by the filter 1 are heated and incinerated. That is, when the upstream wire mesh 39 or the downstream wire mesh 40 of the filter 1 is energized and the energization time reaches a predetermined time, the temperature of the filter body 3 reaches a temperature at which the particulates can be burned and is collected by the filter 1. The particulates are heated and incinerated, and the filter 1 is regenerated.

When the exhaust gas continues to flow into the branch passage 12 and the filter 1, the filter 1 eventually becomes clogged. The particulates accumulated on the filter 1 reach a predetermined amount, and the pressure ratio of the exhaust gas pressure on the upstream side and the downstream side of the filter 1 reaches a predetermined value. When the pressure ratio reaches a predetermined value, the actuator 1
6, the switching valve 9 is switched, and the exhaust gas from the diesel engine flows into the branch passage 11 again through the exhaust pipe 10. Therefore, while the exhaust gas is flowing into the branch passage 11, the inflow of the exhaust gas into the branch passage 12 is blocked.
Of the filter 1 is performed. That is, when the upstream wire mesh 39 or the downstream wire mesh 40 of the filter 1 is energized and the energization time reaches a predetermined time and the temperature reaches a temperature at which the particulates can be burned, the particulates collected by the filter 1 are collected. Is heated and incinerated, and the filter 1 is regenerated.

[0033]

Since the diesel particulate filter device according to the present invention is constructed as described above, a frame support for retaining the shape of the bellows-like folds of the filter body can be manufactured very easily and at low cost. be able to. In addition, since the heat insulator plate is placed in the valley of the bellows-like fold of the filter body, the accumulation of particulates in the valley of the fold can be suppressed, and local abnormalities occur during regeneration of the filter. It is possible to prevent overheating, prevent damage to the filter, and improve durability.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing an outline of a diesel particulate filter device according to the present invention.

FIG. 2 is a sectional perspective view showing a cylindrical filter in the diesel particulate filter device of FIG.

FIG. 3 is a partial cross-sectional view illustrating a structure of a housing in FIG. 2;

FIG. 4 is a sectional view showing a skeleton support incorporated in the cylindrical filter of FIG. 2;

FIG. 5 is a perspective view showing a part of the skeleton support of FIG. 4;

FIG. 6 is a plan view showing a material of a cylindrical porous plate of the skeleton support of FIG. 4;

FIG. 7 is a plan view showing a material of a ring member of the skeleton support of FIG. 4;

FIG. 8 is an explanatory view showing a manufacturing process of the skeleton support of FIG. 4;

[Description of Signs] 1 cylindrical filter 2 outer cylinder (cylindrical body) 3 filter main body 4 intermediate cylinder (cylindrical body) 5 housing 6 inner cylinder (cylindrical body) 7, 8 exhaust gas passage 15 skeleton support 18 cylinder Perforated plate 19 ring member 20 support rod 29 slit 30 heat insulator plate 31 hole 32 perforated flat plate 33 flat plate 34 fold portion 35 valley portion of fold portion 36 inner portion of fold portion 39 upstream wire mesh 40 downstream wire mesh 42 heat shield layer 45 Outer cylindrical wire mesh member 46 Inner cylindrical wire mesh member 47, 48 Heat shielding air layer 49 Notch of ring member 50 Cylindrical forming die 51 Groove of forming die 52 Plate member with support rod

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F01N 3/02

Claims (10)

(57) [Claims] 1. A cylindrical housing connected to an exhaust pipe through which exhaust gas discharged from an engine flows, and is disposed in the cylindrical housing so as to form an exhaust gas passage inside and outside, and is included in the exhaust gas. In a diesel particulate filter device comprising a cylindrical filter for collecting particulates, the cylindrical filter includes a cylindrical filter main body having a fold folded in a bellows shape in a circumferential direction;
A heater disposed in contact with the filter main body for heating and burning the particulates collected by the filter main body; and a skeleton support disposed inside the filter main body for maintaining the shape of the filter main body. A cylindrical porous plate having a slit disposed inside the filter main body and formed in the circumferential direction so as to be spaced apart from each other in the axial direction; A diesel particulate filter device comprising: a ring member having a support rod that penetrates the slit and enters the fold of the filter body. 2. A filter extending in the axial direction of the fold of the filter main body between the support rods adjacent in the circumferential direction and between the outer surface of the cylindrical porous plate and the fold of the filter main body. 2. The diesel particulate filter device according to claim 1, wherein the heat insulator plates are sequentially arranged. 3. The diesel particulate filter device according to claim 2, wherein the heat insulator plate is formed of ceramics such as alumina, silicon nitride, silicon carbide, or a heat-resistant metal material. 4. The cylindrical perforated plate is formed by forming a perforated plate having perforations having a predetermined width and having the slits sequentially formed in the length direction spaced apart in the width direction into a cylindrical shape. The diesel particulate filter device according to claim 1, wherein the filter is formed. 5. The ring member is formed by forming a pair of flat plate members with a support rod, which are obtained by cutting a flat plate having a predetermined width into zigzags while leaving both side edges, into a cylindrical shape. Item 2. A diesel particulate filter device according to item 1. 6. The forming process of the frame support, wherein the support rod of the flat plate member with the support rod is fitted into the slit of the porous flat plate, and the support is inserted into a groove formed in a circumferential direction of a cylindrical forming die. 6. The diesel particulate filter device according to claim 5, wherein the filter is formed by forming a cylindrical shape while fitting the edge of the flat plate member with a rod. 7. The tubular housing is formed of a laminated tubular body made of a plurality of thin plate members, and at least one tubular wire mesh member forming a heat shield air layer disposed between the tubular bodies. 2. The diesel particulate filter device according to claim 1, wherein openings at both ends between the cylinders are sealed. 8. The diesel particulate filter device according to claim 7, wherein the cylindrical housing has a heat shield layer made of a heat-resistant metal coated with an aluminum-based metal material on an inner surface side of the cylindrical body. 9. The filter body according to claim 1, wherein the filter body is formed of a laminated material in which ceramic fibers are randomly laminated, and a wire mesh forming the heater is disposed in contact with the surface of the filter body. Diesel particulate filter equipment. 10. The exhaust gas flowing into the cylindrical housing from the exhaust pipe flows from the exhaust gas passage outside the cylindrical filter to the inside of the exhaust gas passage, and the heater controls the exhaust of the filter main body. 2. The diesel particulate filter device according to claim 1, wherein the device is disposed upstream of the gas flow.