Electromagnetically operated valve

Details Electromagnetically operated valve Electromagnetically operated valve

1999-07-08

2000-07-18

Kashnikow, Andres

Fluid sprinkling, spraying, and diffusing

Including valve means in flow line

Reciprocating

25112921, B05B 316, F16K 3102

Patent

active

06089475&

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND INFORMATION

German Patent Application 38 31 196 describes an electromagnetically operable valve which has a valve needle that is axially moveable in a through-hole of a valve-seat support. The valve needle is formed of a cylindrical armature, a spherical valve-closure member and a tubular or sleeve-shaped connecting part connecting both structural elements to one another. The connecting part is produced from a flat sheet metal which is subsequently rolled or bent until it assumes a cylindrical, sleeve-like shape. In this form, the connecting part has a slit extending over its entire axial length which can run either axially-parallel or at an angle to the longitudinal valve axis. The two end faces of the sheet metals used, running in the longitudinal direction, lie opposite each other with a constant clearance forming the slit between them. When producing a fixed joining between the connecting part and the valve-closure member by applying a welded seam using a laser (continuous wave laser), disadvantageous sink marks develop at the relatively broad slit. In this context, a sink mark is an area at which less material is available for fusing, and at which material consequently falls inwardly. As a consequence, at such a location the welded seam has a dent-shaped, concave depression which represents a certain disturbance of the welded seam. Although the laser ray is not masked out when sweeping over the slit, the welded seam may even have a break in the area of the slit.
German Patent Application No. 40 08 675 described an electromagnetically operable valve, in which the valve-closure member is attached to the connecting part by a welded seam, the welded seam being interrupted at least in the area of the longitudinal slit, or even additionally at further spots in the circumferential direction.


SUMMARY OF THE INVENTION

The electromagnetically operable valve of the present invention has the advantage that it can be produced cost-effectively in a particularly simple manner. It yields the advantage of a connecting part having relatively great tolerances. With low weight and great stability, the connecting part has a large-area hydraulic flow cross-section. Because of the slit extending over the entire axial length, the connecting part has elasticity, thus facilitating the connections to the armature and the valve-closure member. The springy flexibility permits the connecting part to be inserted under tension into the inner opening of the armature, thus avoiding a disadvantageous formation of a cutting when mounting the armature. On the other hand, the valve-closure member can be secured very easily and reliably at the end of the connecting part facing away from the armature, since the slit has a markedly reduced opening width. When using a continuous laser weld (continuous wave laser) to secure the valve-closure member to the connecting part, a welded seam is advantageously attained which has no substantial break. Reducing the width of the slit at one end of the connecting part results in an increase of the welded cross-section and almost to an avoidance of sink marks of the welded seam at the slit edges. The slit of the connecting part, produced from a non-magnetic material, prevents the formation of an unwanted eddy current.
It is also advantageous to produce the connecting part from a sheet metal, in that sheet-metal sections are first punched out in a substantially rectangular shape and subsequently rolled or bent. The respective elongated end faces of the sheet-metal section lie opposite each other with a small clearance, thus forming the slit of the connecting part.
The fixed joining of the valve-closure member which, for example, is spherical, to the end of the connecting part, formed with a tapering of the slit, is attainable by a welded seam running completely around by 360.degree., which has a very high dynamic strength.
At the lower end of the connecting part facing the valve-closure member, at the periphery exactly opposite the slit, it is advantageous to provide a notch which ensures a

REFERENCES:
patent: 5199648 (1993-04-01), Fujikawa
patent: 5360197 (1994-11-01), Reiter et al.
patent: 5580001 (1996-12-01), Romann et al.
patent: 5921469 (1999-07-01), Romann

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