Electromagnetically actuated valve

Details Electromagnetically actuated valve Electromagnetically actuated valve

1997-01-06

1998-06-23

Lee, Kevin

Valves and valve actuation

Electrically actuated valve

Including solenoid

2395854, F16K 3106

Patent

active

057693919

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to an electromagnetically actuated valve.


BACKGROUND INFORMATION

The German Patent No. 40 03 227 describes an electromagnetically actuated valve, whose valve pipe, as the fundamental structure of the valve, is composed of three parts. On the one hand, a magnetic valve-seat support is provided, through which the magnetic flux enters radially via a radial air gap into an armature fastened to a valve needle. On the other hand, a core serves as a magnetic internal pole, which is disposed upstream from the valve-seat support and which directs the magnetic flux in the axial direction. In addition, the valve pipe also has a non-magnetic adapter, which joins the core and the valve-seat support to one another, forming a hydraulic seal. Thus, the non-magnetic adapter does not conduct any magnetic flux, so that the magnetic flux passes through the armature as useful flux and the magnetic circuit has a high level of effectiveness. However, three individual component parts must be individually manufactured in a precision operation, placed in a defined position relative to one another, and then joined together. As a result, at least two joints or connecting points e.g., welds, are formed, which entail additional outlay and have the attendant danger that the parts to be welded together and to become deformed during welding due to thermally produced strains.


SUMMARY OF THE INVENTION

One of the advantage of the electromagnetically actuated valve according to the present invention, is that the valve pipe has an especially simple design, since it is composed of fewer component parts, so that the number of joints and connecting points is reduced cost-effectively because only magnetically conductive material is used for the entire valve pipe, and the quality of the magnetic circuit is, nevertheless, not compromised. This is achieved in that, in the axial extension region of the armature, the valve pipe according to the present invention has a magnetically conductive choke site which is thin-walled in the radial direction, is quickly saturable, and is used to limit the magnetic stray flux to a minimum.
It is further advantageous to design the valve pipe in one piece, in order to guarantee the hydraulic seal tightness in any case. The one-piece valve pipe extends completely over the entire length of the valve and, thus, also determines the same.
In two-part design approaches, according to the present invention it is advantageous for the material used for the valve-seat support with the choke site to have a substantially lower saturation flux density than that used for the core. A solution would be provided, e.g., by nickel-iron alloys or pure nickel, in which the saturation flux densities amount to about 0.5 tesla (T). The choke site reaches its saturation point even earlier, so that, e.g., the choke cross-section of the choke site can be enlarged to attain a greater mechanical strength for the valve pipe.
It is also important to provide the magnetic choke site so that at least one guide surface provided on the armature moves past to the extent that is possible in one axially central region of the choke site during the axial movement of the valve needle. The same advantage is also attained when the guide surfaces for the armature lie directly in the axially central region of the choke site. Only in this manner can the lateral forces that arise be kept to a minimum.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a first exemplary embodiment of a first valve according to the present invention.
FIG. 2 shows a detail of the first valve arrangement positioned near the choke, according to the first embodiment of the present invention.
FIG. 3 shows a detail of the second valve arrangement positioned near the choke site.
FIG. 4 shows a detail of the third valve arrangement positioned in the area of the choke site.
FIG. 5 shows a second exemplary embodiment of the valve according to the present invention.
FIG. 6 shows a detail of the fourth valve arrangement in the area of th

REFERENCES:
patent: 5009390 (1991-04-01), McAuliffe, Jr. et al.
patent: 5143301 (1992-09-01), Reiter et al.
patent: 5178362 (1993-01-01), Vogt et al.

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