JP2002174109A - Filter for dpf device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter for a DPF device with a radial frame body constituted with the reduced number of parts, capable of reducing the number of welding points necessary to assembly of a columnar side member, and manufacturing the filter at a low cost. SOLUTION: A filter member 1 consists of a cylinddricla frame body 20A having a radial protrusion parts 23a, and a cloth filer member 10 folded in a bellows-form and wound in an uneven form around the cylindrical side of the frme body 20A. The filter is located so that a gap 25 for a gas passage is provided between the frame body 20A and a second end part member 22 having an operating part 22a. The filter consists of a pluralitY of columnar side members 24A forming a cylinder side and a radial member 23 having the protrusion parts 23a, and the columnar side member 24A is formed integrally with at least one of the end part members 21A and 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter for a DPF device for trapping PM in exhaust gas from a diesel engine mounted on a truck or a bus.

[0002] More specifically, the present invention relates to a structure of a filter frame (filter frame).

[0003]

2. Description of the Related Art PM in exhaust gas from diesel engines and the like
Research and development of a DPF (Diesel Particulate Filter) device for collecting (particulate matter) has been conducted. As the filter member of this DPF device, one using cordierite or inorganic fiber is used. I have.

In the case of the cordierite filter member, a relatively large PM can be captured,
Recently, because it is not possible to capture small particles,
Attention has been focused on filter members using inorganic fibers that can withstand high temperatures.

The filter member using the inorganic fiber is made of a heat-resistant silicon carbide or silicon nitride based filter.
It is formed by laminating one or several nonwoven fabrics in which ceramic fibers each having a length of about 10 to 50 mm having a diameter of μmφ are laminated at random, by a heat-resistant metal wire mesh.

Then, the cloth-like filter member 10 is
As shown in FIG. 10, it is wound around a cylindrical frame (filter frame) 20 having radial projections 23a and bent in a bellows shape, and as shown in FIG. On the outside, the other bent portion 12 is formed inside the cylinder and the flat portion 13 is formed radially.

As shown in FIG. 10, the radial frame 20 includes an upstream end member 21 and a downstream end member 22, a rod-shaped ridge 23a projecting radially (starfish-like) outward, and
And a columnar side member (bar-shaped shield member) 24 connecting the both end members 21 and 22, and has a cage shape having a gas passage gap 25 between the columnar side members 24.

The upstream end member 21 is closed, and the downstream end member 22 is provided with an opening 22a serving as a gas outlet.

As shown in FIG. 11, the projections 2 of the radial frame 20 are provided inside the projections of the filter member 10.
The gas passages 2 are formed between the adjacent flat portions 13 by closely adhering 3a. Further, as shown in FIG. 12, a clip 30 sandwiches the bent portion 11 on the outside of the filter member 10 from the outside of the protruding portion 23a and fixes the same, thereby forming the filter 1 for a DPF device as shown in FIG. ing.

The gas G to be purified by the DPF filter 1 travels from the upstream end 21 of the radial frame 20 to the outside of the cylinder, passes through the gas passage 2 of the filter member 10 and passes through the inside of the filter member 10. The gas Gc, which has been purified by passing through, passes through the gas passage gap 25 of the radial frame body 20, exits into the hollow portion at the center of the cylinder, and is discharged to the outside through the opening 22a.

In the prior art, as shown in FIG. 14, a radial frame (filter frame) 20 of the filter 1 for a DPF device has a first end member (first cover seal plate) 21 and a second end member. (Second cover seal plate)
22, a large number of columnar side members (shield plates),
A radial annular plate (radial frame) 23 having several ridges 23a.

The first end member 21 is the upstream end of the gas, the second end member 22 is the downstream end, and the opening 22a of the second end member 22 is connected to the gas outlet. Become. In addition, the column-shaped side members 24 are arranged with a gap therebetween so as to serve as a gas passage portion 25 between adjacent members, and the both end members 21 and 22 are connected to form a cylindrical circumferential side surface.

With this configuration, the portion where the columnar side members 24 are present serves as a shield portion for preventing gas flow, and the gap between the columnar side members 24 serves as a gas passage portion 25. The shield portion formed by the columnar side surface member 24 can prevent gas from flowing into the concave portion of the filter member that is easily clogged with PM.

The radial annular plate 23 is connected to the columnar side member 2.
4, the first end member 21 and the second end member 22
2 to several pieces are arranged in parallel with the disk surface. The filter member 10 is bent and wound in a bellows shape along the irregularities of the ridges 23a of the radial annular plate 23 and the valleys 23b between the ridges 23a.

[0015]

However, this prior art filter for a DPF device comprises a first end member 21, a second end member 22, a columnar side member 24, and a radial annular plate 23. Moreover, since the number of the columnar side members 24 is, for example, as many as 23, the number of parts increases, and there is a problem that costs in parts procurement and factory management, such as purchase management, inventory management, and distribution management, increase. .

Further, the columnar side member 24 and the first end member 2
1, and since the joining between the columnar side member 24 and the second end member 22 is performed by spot welding, as shown in FIG. 15 (the radial annular plate 23 is omitted for simplicity), The number of welding portions 50 increases.

Since the gap between the columnar side members 24 becomes the gas passage portion 25, the assembling accuracy of the columnar side members 24 can be improved with high precision in view of the gas flow resistance of the filter and the collecting performance. Since it is necessary to maintain the assembly accuracy, it is necessary to control the assembling accuracy, and there is a problem that the assembling cost is also increased in this respect.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and has as its object to form a radial frame with a small number of parts and to perform welding necessary for assembling a columnar side member. An object of the present invention is to provide a filter for a DPF device which can reduce the number of points and can be manufactured at low cost.

[0019]

Means for Solving the Problems A filter for a DPF device for achieving the above object is constituted as follows.

A gas containing a cylindrical frame having radial projections, and a cloth-like filter member folded in a bellows shape on the cylindrical side surface of the frame and wound in an uneven shape. In the filter for trapping fine particles, the frame is formed by separating the first end member on one end side and the second end member having an opening on the other end side from each other at an interval. A radial shape having a plurality of columnar side members arranged to provide a passage gap and connecting the first end member and the second end member to form a cylindrical side surface, and the ridge portion radially extending in an outer peripheral direction. An annular member is formed, and the columnar side member is formed integrally with at least one of the first end member and the second end member.

With this configuration, the number of parts can be reduced, the management work in parts procurement can be simplified, and the management cost in the factory can be reduced.

Further, since the interval between the columnar side members can be accurately set in advance by press working, the assembly accuracy can be kept good, and the performance related to gas flow of the filter can be maintained in an excellent state. And uniformity can be eliminated.

In addition, since the number of parts and the number of welding points are reduced, the assembling process can be rationalized, and the positioning between the parts is simplified, so that the welding can be automated even with simple equipment. Can be.

In the above-mentioned filter body for a DPF device, a part of the columnar side member is formed integrally with the first end member, and the remaining part of the columnar side member is formed as the second end member. And is integrally formed.

According to this configuration, the first part in which the first end member and the columnar side member are integrated and the second part in which the second end member and the columnar side member are integrated have the same shape except for the opening. Therefore, the same press die can be used, and the manufacturing cost can be reduced.

In this case, it is preferable that the number of the columnar side members is halved. However, if the number of the columnar side members is not half due to an odd number or the like, the extra columnar side member may be cut and removed after press working.

Alternatively, the filter for a DPF device is configured as follows.

A gas containing a cylindrical frame having radial ridges, and a cloth-like filter member which is bent in a bellows shape on the cylindrical side surface of the frame and wound in an uneven shape. In the filter for trapping fine particles, the frame is formed by separating the first end member on one end side and the second end member having an opening on the other end side from each other at an interval. A radial shape having a plurality of columnar side members arranged to provide a passage gap and connecting the first end member and the second end member to form a cylindrical side surface, and the ridge portion radially extending in an outer peripheral direction. Along with the annular member, the column-shaped side member is formed by forming a parallel slit in the plate-shaped member to be a gap for the gas passage and bent to form a cylindrical column-shaped side member continuous body. It is composed.

With this configuration, the entire columnar side member can be handled as an integrated continuum, and the number of parts and the number of welding points can be reduced, so that the same effects as described above can be obtained.

[0030]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a filter for a DPF according to the present invention. Since the filter member 10 and the radial frame 20 have been described in the above description of the related art,
Duplicate descriptions are omitted. Also, the ridge 23a in the drawing
The numbers of the columnar side members 24, 24A, 24B, 24C, etc. are reduced in number for the sake of clarity of the drawing, and are not shown in exact numbers.

[First Embodiment] A filter for a DPF device according to a first embodiment of the present invention, as shown in FIG.
In the cylindrical frame (filter frame) 20A having the radial ridges 23a, a large number (for example, 23) of columnar side members 24A and a first end member 21A that constitute a cylindrical circumferential side surface are integrated. It is formed of a component 40, a second end member 22 having an opening 22a, and a radial annular plate 23 having a number (for example, 23) of ridges 23a extending radially in the outer circumferential direction of the cylinder.

As shown in FIG. 1, the part 40 is formed by processing a plate member into a disk by blacking, trimming the disk to form a columnar side member 24A, and forming the columnar side member 24A. Is formed by raising a portion by pressing.

Then, as shown in FIGS. 11 to 13, an inorganic fiber cloth-like filter member 10 is bent in a bellows shape on the cylindrical side surface of the frame 20A.
The protrusion 23a is pinched by the unevenness of 0, and this portion is fixed by the clip 30 or the like.

According to this configuration, since the columnar side surface member 24A and the first end member 24 are integrated into the part 40, the number of parts and the number of welding points are significantly reduced. In addition, since the interval between the columnar side members 24A can be processed with high precision by press working, the assembly accuracy of the frame 20A can be kept good.

[Second Embodiment] In a filter for a DPF device according to a second embodiment, as shown in FIG. 4, a part of a columnar side member 24B is integrated with the first end member 21B. Part 41 formed on the side surface and the columnar side member 24B
End member 22 having an opening 22a.
B and a plurality of (for example, 23) ridges 23a radially extending in the outer peripheral direction of the cylinder.
And a radial annular plate 23 having

The first part 41 is, as shown in FIG.
Forming the plate member into a substantially semi-circular plate by blacking, trimming the substantially semi-circular plate to form a columnar side member 24B, and forming the columnar side member 24B by pressing. Can be. Similarly, the second component 42 in which the remaining half of the columnar side member 24B and the second end member 22 are integrated can be formed.

As for the second part 42, if there is an extra columnar side member 24B by press working or the like, it is removed by cutting or the like, and an opening 22a is provided.

Then, as shown in FIG. 6 (the radial annular plate 23 is omitted for the sake of simplicity), the first component 41 and the second component 42 are abutted on the side of the columnar side member 24B, and welding 52 and the like are performed. To form a cylindrical frame 20B having radial ridges 23a.

According to this configuration, the manufacturing process for a part of the first part 41 and the second part 42 can be shared, so that the manufacturing cost can be reduced.

[Third Embodiment] As shown in FIG. 7, a filter for a DPF device according to a third embodiment has a cylindrical frame (filter frame) 20C having radial ridges 23a. A continuous columnar side member 43 in which a number of (for example, 23) columnar side members 24C constituting the circumferential side surface of the cylinder are connected by a connecting portion 24a, and a first end member 21
And a second end member 22 having an opening 22a, and a radial annular plate 23 having a large number (for example, 23) of ridges 23a extending radially in the outer peripheral direction of the cylinder.

As shown in FIG. 8, the column-shaped side member continuous body 43 forms a parallel slit 43a to be a gap of the gas passage portion 25 in the plate-shaped member, and
a is formed by press molding so as to provide a connecting portion 43b on one end side of a, and a side plate integrated with the columnar side member 24C at the connecting portion 23b is roller-bent and formed into a cylindrical shape. it can.

By using the continuous columnar side member 43, the continuous columnar side member 43 and the first end member 21 are joined by spot welding 53 at several points. After a predetermined number of radial annular plates 23 have been fitted between the columnar side members 24C, as shown in FIG. The second end member 22 is placed on the side and joined by spot welding 53 or the like to form a cylindrical frame 20C having radial ridges 23a.
To form

With the configuration using the cylindrical columnar side member continuum 43, the entire columnar side member 24C becomes a cylindrical part 43, so that the number of parts and the number of welding points can be reduced.

In the case of the third embodiment, although the number of parts and the number of welding points are slightly increased as compared with the first embodiment, there is an advantage that the stop of the plate member is improved. .

[0045]

As described above, the DP according to the present invention is
According to the F device filter, the following effects can be obtained.

If the columnar side member is formed integrally with at least one of the first end member and the second end member, the number of parts can be reduced, and the management work in parts procurement can be simplified. In addition, management costs in a factory can be reduced.

Further, since the interval between the columnar side members can be accurately processed in advance by press working or the like, it is possible to maintain good assembly accuracy. Therefore, the performance such as the flow resistance and the trapping performance related to the gas flow of the filter can be maintained in an excellent state, and the performance can be made uniform without any variation. Therefore, it is possible to stably supply a filter for a DPF device having a quality that meets the required specifications.

Further, not only the number of parts but also the number of welding points and the number of assembling steps can be reduced, so that the assembling process can be rationalized. In addition, since the positioning between the parts is simplified, the automation of welding can be realized even with simple equipment.

By forming a part of the columnar side member integrally with the first end member and forming the remaining part of the columnar side member integrally with the second end member, Since the first component in which the one end member and the columnar side member are integrated, and the second component in which the second end member and the columnar side member are integrated can be formed in the same shape except for the opening. The same press die can be used, and the manufacturing cost can be reduced.

The column-shaped side member is bent by forming a parallel slit in the plate-shaped member to be a gap for a gas passage.
By forming and configuring as a cylindrical columnar side member continuous body, the entire columnar side member can be handled as an integrated continuous body, and the number of parts, the number of welding points, and the number of assembly steps can be reduced. Similar effects can be obtained.

[Brief description of the drawings]

FIG. 1 is an exploded view of a radial frame according to a first embodiment of the present invention.

FIG. 2 is an explanatory view showing a method of manufacturing the integrated component of FIG.

FIG. 3 is a perspective view showing the assembly of the radial frame body of FIG. 1;
However, the radial annular plate is omitted for easy understanding.

FIG. 4 is an exploded view of a radial frame according to a second embodiment of the present invention.

FIG. 5 is an explanatory view showing a method of manufacturing the first part and the second part of FIG. 4;

FIG. 6 is a perspective view showing the assembly of the radial frame of FIG. 4;
However, the radial annular plate is omitted for easy understanding.

FIG. 7 is an exploded view of a radial frame according to a third embodiment of the present invention.

FIG. 8 is an explanatory view showing a method of manufacturing the continuous columnar side member of FIG. 7;

FIG. 9 is a perspective view showing the assembly of the radial frame body of FIG. 7;
However, the radial annular plate is omitted for easy understanding.

FIG. 10 is a diagram of a radial frame related to the present invention;
(A) is a plan view, and (b) is a perspective view including a cross section.

11 is a diagram in which a filter member is wound around the radial frame body of FIG. 10, (a) is a plan view, and (b) is a perspective view including a cross section.

12 is a diagram in which a clip is attached to the assembly of the radial frame body and the filter member of FIG. 11, (a) is a plan view, and (b) is a perspective view including a cross section.

FIG. 13 is a perspective view of a filter for a DPF device manufactured by the present invention.

FIG. 14 is an exploded view of a conventional radial frame.

FIG. 15 is a perspective view showing the assembly of the radial frame body of FIG. 14; However, the radial annular plate is omitted for easy understanding.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filter for DPF apparatus 10 Filter member 20, 20A, 20B, 20C Radial frame body 21, 21A, 21B 1st end member 22 2nd end member 22a Opening 23 Radial annular member 23a Projection 24, 24A, 24B , 24C Column side member 25 Gas passage (gap for gas passage) 43a Slit 43 Column member continuous body

Claims (3)

[Claims] 1. A gas comprising: a cylindrical frame having radial ridges; and a cloth-like filter member folded in a bellows shape on the cylindrical side surface of the frame and wound in an uneven shape. In a filter for trapping fine particles therein, the frame body is provided between a first end member on one end side and a second end member having an opening on the other end side with an interval therebetween. A plurality of columnar side members that are arranged with a gas passage gap therebetween, form a cylindrical side surface by connecting the first end member and the second end member, and the protrusion that radially extends in the outer peripheral direction. A filter for a DPF device, wherein the filter is formed by a radial annular member having the columnar side member and at least one of the first end member and the second end member. 2. A part of the columnar side member is formed integrally with the first end member, and a remaining portion of the columnar side member is formed integrally with the second end member. The filter for a DPF device according to claim 1, wherein 3. A gas comprising: a cylindrical frame having radial ridges; and a cloth-like filter member folded in a bellows shape on the cylindrical side surface of the frame and wound in an uneven shape. In a filter for trapping fine particles therein, the frame body is provided between a first end member on one end side and a second end member having an opening on the other end side with an interval therebetween. A plurality of columnar side members that are arranged with a gas passage gap therebetween, form a cylindrical side surface by connecting the first end member and the second end member, and the protrusion that radially extends in the outer peripheral direction. Along with the radial annular member having, the column-shaped side member is formed by forming a parallel slit to be a gap for the gas passage in the plate-shaped member and bent, and integrated as a cylindrical column-shaped side member continuous body. A filter for a DPF device, wherein the filter is formed.