JPH0219538Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a diesel particulate filter purification device.

[Conventional technology]

A diesel particulate cleaning apparatus is known in which an electric heater for regenerating particulate material is disposed in the exhaust system of a diesel engine in close proximity to particulate collecting material. In this case, the particulate collection material collects particulate matter in the exhaust gas and cleans the exhaust gas. By selectively igniting the electric heater, the particulate matter accumulated in the collecting material is burned, and the collecting material is regenerated and can be used for a long time. One end of the heater wire of the electric heater is connected to an external current supply means, and the other end is grounded. An electrode member is attached to connect the heater wire to an external current-carrying means, and one end of the heater wire is welded to this electrode member (for example,
58-108217).

[The problem that the idea aims to solve]

However, when connecting the heater wire to the electrode member by welding, even if these are welded in the most common type of butt welding, the weld part must be placed over the joint between the heater wire and the electrode member to connect the heater wire to the electrode member. It is necessary to provide the heater wire along a certain length in the longitudinal direction of the wire, so that the heater wire can heat not only the welding portion but also the vicinity thereof. Therefore, a considerable range of the heater wire is heated in its longitudinal direction, causing problems such as distortion after welding and thermal deterioration of the material of the heater wire. Therefore, there was a problem in that the heater wire was subjected to vibrations using the electrode member as a fulcrum due to engine vibrations, and was likely to break near the welded portion. The present invention aims to solve these problems.

[Means to solve the problem]

The diesel particulate waste purifying device according to the present invention includes an electric heater for regenerating particulate material disposed in close proximity to particulate material collecting material in the exhaust system of a diesel engine, and a heater wire of the electric heater connected to an electrode member that communicates with the current supply means. In the case where the electrode members are connected by welding, the electrode member has a fitting support portion formed between opposing side surfaces into which a heater wire can be fitted, and the heater wire is fitted into the fitting support portion so that its tip end This is characterized in that the electrode member is welded to the side surface of the heater wire tip end side of the electrode member.

[Effect]

In the above configuration, welding is performed from the side surface of the electrode member on the heater wire tip side. Therefore, the welding part is limited to only the side surface of the electrode member on the heater wire tip side, and the heat due to welding is less transmitted to the rear in the longitudinal direction of the heater wire. Since the heater wire is supported by the fitting support portion of the electrode member, the heater wire will not break even if there is vibration of the engine or the like.

〔Example〕

FIG. 1 is a front view of a heater for collecting material regeneration of a diesel particulate purification system, with the viewing side facing and upstream of the collecting material or filter means. The regeneration heater has a heater case 2 and can be connected to an exhaust pipe.

A heater structure is attached within the heater case 2 of the regeneration heater with screws 3 and the like. This heater structure includes a heat-resistant metal substrate 4 having an annular portion along the inner periphery of the case 2, a bridge portion extending radially from the annular portion toward the center, and a support insulator 5 supported by the bridge portion. The heater wires 6 are arranged between the support insulators 5 and serve as heating elements.

The inner end of the heater wire 6 is connected to the cathode terminal 7,
This is grounded to the vehicle body, etc. The outer end of the heater wire 6 is connected to an anode terminal 8. There are as many anode terminals 8 as there are heater wires 6 which are divided and arranged, and in the example shown in the figure, there are six. The anode terminal 8 extends through the heater case 2 and is connected to a lead wire 9 connected to a power source outside the case.

Of the six heater wires 6, the two on the left are directly connected to the respective anode terminals 8, and the remaining four are determined via the respective electrode guide rails 10 extending along the outer periphery of the substrate 4. The anode terminal 8 is connected to the anode terminal 8.

FIG. 2 shows the heater wire 6a directly attached to the anode terminal 8a, and FIG. 3 is an exploded view of FIG. The anode terminal 8a has a U-shaped support groove 11 as a fitting support portion formed between opposing side surfaces of the plate wall, and the heater wire 6a is fitted and supported in this support groove 11. When mating, the heater wire 6a
The tip 6b is 0.5 mm from the plane 8b of the anode terminal 8a.
It protrudes by about 1.0 mm, and this protruding tip 6b is welded to the side surface 8b of the anode terminal 8a on the heater wire tip side, as shown by symbol 12. By welding with the tip 6b protruding, it is possible to use the heater wire tip itself as a welding material, to minimize melting of the anode terminal 8a, and to obtain welding strength while maintaining the original shape. Furthermore, since the welding part is limited to the tip 6b of the heater wire 6a and the vicinity of the side surface 8b on the heater wire tip side, which is a part of the support groove 11 forming part, welding of the heater wire 6a supported in the support groove 11 The degree of thermal deterioration of the parts that were not welded decreases as the distance from the weld increases, and the parts that conventionally broke within a certain distance from the weld due to bending stress due to engine vibration etc. are now supported within the support groove 11. As a result, substantial bending stress is not applied to the heater wire 6a, thereby preventing breakage of the heater wire 6a. Furthermore, by increasing the unwelded engagement portion between the heater wire 6a and the anode terminal 8a, the thermal strain of the heater wire 6a is also reduced, which also acts to avoid concentration of bending stress.

In FIG. 4, the fitting support portion of the heater wire 6a of the anode terminal 8a is formed as a through hole, and the tip of the heater wire 6a is similarly protruded from the hole to form the anode terminal 8a.
is welded to the side surface 8b on the heater wire tip side. Fifth
In the figure, the heater wire 6c is connected to the electrode guide rail 10c.
similarly connected to.

[Effect of idea]

As explained above, according to the present invention, the electrode member has a fitting support portion into which the heater wire can be fitted, and the heater wire is fitted into the fitting support portion so that its tip end is connected to the heater of the electrode member. Since the welding is done on the side surface of the wire tip, the welding part is limited only to the side surface of the electrode member on the heater wire tip side, and the heater wire is heated during welding and can be easily broken in the past. Since the heater wire is supported by the fitting support portion of the electrode member, the heater wire will not break near the welding portion.

[Brief explanation of the drawing]

Figure 1 is a front view showing the heater for regenerating the collection material of the diesel particulate purification system, Figure 2 is an enlarged perspective view showing the connection between the heater wire 1 and the anode terminal in Figure 1, and Figure 3 is the FIG. 4 is an exploded perspective view of FIG. 2, FIG. 4 is a perspective view showing a variation of FIG. 2, and FIG. 5 is an enlarged perspective view showing a connecting portion between another heater wire and an electrode guide rail. 2... Heater case, 6... Heater wire, 8...
Anode terminal, 9... Lead wire, 10... Electrode guide rail, 11... U-shaped support groove, 12... Welding part.

Claims (1)

[Scope of utility model registration request] In the exhaust system of a diesel engine, an electric heater for regenerating the particulate collection material is arranged in close proximity to the particulate collection material, and a heater wire of the electric heater is connected by welding to an electrode member communicating with the energizing means,
The electrode member has a fitting support portion formed between opposing side surfaces into which a heater wire can be fitted, and the heater wire is fitted into the fitting support portion so that its tip end is connected to the side surface on the heater wire tip side. A diesel particulate purification device characterized in that it is welded to.