JPS6232276A - Filter device - Google Patents

Abstract

PURPOSE:To certainly prevent meshes of a main wire netting from being expanded by providing an auxiliary wire netting, which has meshes larger than those of the main wire netting, on each of both obverse and reverse faces of the main wire netting and forming the whole of these nettings like a cylinder with the bottom through deep drawing process. CONSTITUTION:A wire netting 8 of the captioned filter device is composed of three wire nettings, that is, a main wire netting 8A and two auxiliary wire nettings 8B, 8C closely attached to the obverse and reverse faces of said main netting 8A respectively, while the wire netting 8 is formed like a cylinder with the bottom through deep drawing process. The main wire netting 8A functions as a filter, while the auxiliary wire nettings 8B, 8C simply serve for protection and reinforcement of the main wire netting 8A and meshes larger than those of the main wire netting 8A are used for said nettings 8B, 8C. On the other hand, an adapter 9 is formed like a cylinder, with both ends opened, of stainless steel and the like as in the past, while the opening end part of the wire netting 8 is inserted into the adapter 9 and fixed by silver solder 10 or the like.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a filter device suitable for use in electronically controlled fuel injection devices of automobiles, etc., and in particular can prevent opening of a wire mesh during deep drawing. This is how it was done.

[Conventional technology]

An electronically controlled fuel injection device built into a diesel engine of an automobile generally has an outer cylinder 1, as shown in FIG.
Flenoid coil 2. Plunger 3, needle pulp 4
．． Wiring connector 5. Consisting of a filter device 6, etc., when the renoid coil 2 is excited by a drive signal from the computer, the needle pulp 4 moves together with the plunger 3 in the direction of the arrow, and fuel is injected from the nozzle 7 provided on the tip surface of the outer cylinder 1. is configured to do so. The filter device f6 removes dust mixed in the fuel and prevents the needle pulp 4 from being worn out or damaged by the dust.

[Problem that the invention seeks to solve]

By the way, the conventional filter device F6 is usually deep-drawn as shown in FIG. 5 in order to increase the effective filtration area and improve the dust removal performance, as well as to reduce the pressure loss of the fuel passing through the filter device 6. It is composed of a bottomed cylindrical stainless steel surface wire mesh 8 and a cylindrical stainless steel adapter 9 in which the open end of the wire mesh 8 is fixed by silver brazing or the like. When the wire mesh 8 is press-fitted into the interior using a movable mold, the friction between the mold and the wire mesh 8 causes the vertical and horizontal wire mesh lines forming the wire mesh 8 to shift and open the mesh. There was an inconvenience that it was difficult to obtain wire mesh (Example 3, 50 mesh). In particular, if the mesh is opened, large particles of dust will pass through, so it will not function as a filter, will accelerate wear and damage of the needle pulp 4, and will completely reduce the durability of the fuel injection device.

[Means for solving problems]

The filter device according to the present invention has been made to solve the above-mentioned problems, and includes a main wire mesh of a desired mesh, and two auxiliary wire meshes each disposed on both sides of the main wire mesh and having meshes larger than the main wire mesh. These wire meshes are formed into a bottomed cylindrical shape by deep drawing, and the open end of the wire mesh is fixed to an adapter by brazing or the like.

[Function] In the present invention, since the main wire mesh is protected by two auxiliary wire meshes, opening of the main wire mesh during deep drawing υ processing is prevented.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 is a half-sectional view showing an embodiment of a filter device according to the present invention. In the figure, the difference from the conventional device shown in FIG. 5 is that the wire mesh 8 is divided into three wire meshes, that is, a main wire mesh 8A, and two auxiliary wire meshes 8B closely arranged on the front and back surfaces of the main wire mesh 8A, respectively.

8C, and the wire mesh 8 is formed into a cylindrical shape with a bottom by deep drawing. Here, the main wire mesh 8A performs a filter function, and a desired mesh (for example, 350 mesh) is used, and the auxiliary wire mesh 13 B r 80 is simply for protecting and reinforcing the main wire mesh 8A'. A wire mesh with a larger mesh than the wire mesh 8A (for example, 60 mesh) is used.

The adapter 9 is made of stainless steel or the like and has a cylindrical shape with both ends open, as in the conventional case, and the wire mesh 8 is attached to the adapter 9.
The open end of is inserted and fixed with silver solder 10 or the like.

According to the filter device configured in this way, the main wire mesh 8A can be prevented from opening, and deep drawing processing of an arbitrary length can be performed. That is, when the wire mesh 8 is deep drawn using a fixed mold and a movable mold, the auxiliary wire mesh 8B comes into contact with these molds.

Only 8C does not make contact with the main wire mesh 8A, so even if the auxiliary wire meshes 8B and 8C open due to friction with the mold, the main wire mesh 8A does not open at all, allowing deep drawing, which is a requirement for filter devices. Maintain the mesh size.

Further, since the auxiliary wire meshes 8B and 8C are reinforced with the main wire mesh 8At, deformation of the main wire mesh 8A due to external force is prevented.

Here, in this embodiment, the auxiliary wire nets 8B and 8C are
As shown in the figure, a case has been described in which the vertical wire mesh wire 15 and the horizontal wire mesh wire 16 are simply woven by plain weaving, but the intersection A of the vertical wire mesh wire 15 and the horizontal wire mesh wire 16 is welded in advance as shown in FIG. By doing so, it is possible to prevent the auxiliary wire meshes 8B and 8C from opening during deep drawing, and in particular, if the outer auxiliary wire mesh 8B can be prevented from opening, it has the advantage of improving the appearance of the filter device.

〔Effect of the invention〕

As described above, the filter device according to the present invention includes a main wire mesh of a desired mesh and two auxiliary wire meshes each disposed on both sides of the main wire mesh and having a larger mesh than the main wire mesh. Since it is formed into a bottomed cylindrical shape by deep drawing, opening of the main wire mesh can be reliably prevented, and a filter device with a large effective filtration area can be provided. In addition, the structure is simple and can be manufactured using the same deep drawing process as conventional methods.

[Brief explanation of drawings]

Fig. 1 is a half-sectional view showing one embodiment of the filter device according to the present invention, Fig. 2 is an enlarged view of the main part of the auxiliary wire mesh, and Fig. 3 is a cross-sectional view showing the state in which vertical wire mesh wires and horizontal wire mesh wires are welded. 4 is a partially cutaway perspective view of an electronically controlled fuel injection device, and FIG. 5 is a half sectional view showing a conventional example of a filter device. 6...Filter device, 8...Wire mesh, 8A...Main wire mesh, 8B, 8C...Auxiliary wire mesh, 9...Adapter, 15...Vertical wire mesh line, 16...Horizontal wire mesh line .

Claims (2)

[Claims] (1) A main wire mesh with a desired mesh and two auxiliary wire meshes each disposed on both sides of the main wire mesh and having a mesh larger than the main wire mesh, and these wire meshes are deep-drawn to form a bottomed cylindrical shape. What is claimed is: 1. A filter device characterized in that the opening end is fixed to an adapter by brazing or the like. (2) The filter device according to claim 1, wherein the intersecting portions of the vertical wire mesh lines and the horizontal wire mesh lines of the auxiliary wire mesh are welded.