Valves and valve actuation – Electrically actuated valve – Including solenoid
Patent
1992-08-03
1994-07-19
Rivell, John
Valves and valve actuation
Electrically actuated valve
Including solenoid
2395854, F16K 3106, B05B 132
Patent
active
053301536
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on an electromagnetically operable valve as set forth hereinafter. An electromagnetically operable valve has already been proposed (German Patent Application P 38 25 135.3) in which, however, the magnet coil is surrounded over its circumference only partially by at least one clip-shaped guide element which is used for guiding the magnetic field lines. In addition, plastic material of a plastic extrusion coating is located in the gap formed between the magnet coil and the guide element. The magnetic field, which is of unfavourable construction, results in a high magnetic stray flux and hence a high energy requirement which has to be applied to open the valve. The central fuel supply, in conjunction with the bent electrical connecting plug, prevents contact being made with a plurality of valves by means of a common plug strip, and prevents a plurality of valves being arranged one behind the other in a series circuit.
ADVANTAGES OF THE INVENTION
The valve according to the invention, has the advantage of a compact valve with a compact magnetic circuit. A short path of the closed field lines which form the magnetic field, and the surrounding housing jacket reduce the magnetic stray flux and hence increase the ratio, which is critical for the energy which has to be used, between the useful flux and the stray flux, so that a smaller energy requirement is necessary to open the valve. The housing jacket makes possible a compact and simple structural shape of the valve, and hence also cost-effective assembly during production.
Advantageous developments and improvements of the valve specified herein are possible by means of the measures outlined hereinafter.
It is particularly advantageous if the metallic housing jacket is closely connected to the connecting part by welding, since the necessary seal between the housing jacket and the connecting part is thus formed at the same time.
It is likewise advantageous if the housing jacket is produced by deep drawing and abuts closely against the core at its upper end and against the connecting part at its lower end, so that detrimental air gaps are avoided and, in addition, welding is simplified.
It is also advantageous if the housing jacket exhibits a housing shoulder which points outwards and, together with an end surface of the plastic sheath pointing in the direction of the housing shoulder, forms the side surfaces of an annular groove whose groove base is formed by the circumference of the housing jacket. The housing shoulder prevents a sealing ring mounted on the circumference of the housing jacket from remaining in a valve holder and from sliding of the jacket housing when the valve is removed from said valve holder.
In order to prevent the sealing ring sliding off the housing jacket, it is likewise advantageous if an annular groove is provided on the circumference of the housing jacket, whose radially extending side surfaces are formed by an end surface of the plastic sheath pointing in the direction of the armature and an end surface of a drawing ring, which is pulled onto the housing jacket, the base of which groove is formed by the circumference of the housing jacket.
It is particularly advantageous if at least one radial lateral opening, which is used as the fuel inlet and is connected to a valve space extending as far as the valve seat, is constructed between an upper sealing ring on the housing jacket and a lower sealing ring on the connecting part. The fuel supply from the side and the axially arranged electrical connecting plugs allow the fuel to flush through a plurality of valves which are arranged one behind the other, in series, complete integration of a plurality of valves in holders of the internal-combustion engine induction pipe, and the common electrical contact by means of a common plug strip.
DRAWING
An exemplary embodiment of the invention is shown in a simplified manner in the drawing and is explained in more detail in the following description.
DESCRIPTION OF THE EXEMPLARY EMBODIMENT
The electromagnetic
REFERENCES:
patent: 4915350 (1990-04-01), Babitzka et al.
Greigg Edwin E.
Greigg Ronald E.
Rivell John
Robert & Bosch GmbH
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