Solenoid valve

Details Solenoid valve Solenoid valve

1999-02-26

2001-03-20

Lee, Kevin (Department: 3753)

Fluid handling

Systems

With flow control means for branched passages

C251S129150

Reexamination Certificate

active

06202699

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a solenoid valve comprising a valve component and a solenoid component including a plunger connected to a piston which is arranged in the valve component housing connected to a support.
In known solenoid valves of this kind the valve component and the solenoid component are separate parts which are combined to form a unit. The solenoid component has a plunger positioned on an amature. The plunger is guided in the vicinity of its two ends in a respective bearing and penetrates into a yoke that, at the end facing the valve component, is sealed by a seal and positioned in the coil. At its lower end, the coil is sealed by a further seal relative to a magnetic ground element (back iron) of the valve component. The back iron or magnetic ground element is sealed by a further seal relative to the housing of solenoid component. Finally, between a plug part of the solenoid component and the solenoid component housing a further seal is provided. Due to the plurality of seals as well as the required bearings for the plunger, the solenoid valve is of a complicated construction and is thus accordingly rather expensive. The plurality of seals also results in the solenoid valve being relatively large. Its mounting is also complicated and expensive. Finally, the solenoid component housing is comprised of metal and must therefore be galvanized at the exterior in order to prevent corrosion. This corrosion treatment requires additional working steps and further increases the costs of manufacturing the solenoid valve.
It is therefore an object of the present invention to embody a solenoid valve of this kind such that it is comprised of only a few components and can be produced with minimal cost and minimal mounting expenditure as well as a minimal constructive size.
SUMMARY OF THE INVENTION
The object of the present invention is solved in that at least one seal is provided between the support and the solenoid component and/or the valve component.
In another embodiment, wherein the solenoid valve has at least one connector pin that is electrically connected to a winding of a coil of the solenoid component and projects into the plug part of the solenoid compartment housing, the object is solved by sealing the connector pin with a second seal relative to the solenoid housing.
According to a further embodiment, the connector pin is embodied by a round pin having one end that is crimped in order to form the pin portion.
In another embodiment of the present invention, wherein the solenoid component has a plunger which is connected to a piston arranged within the housing of the valve component and in which an amature is positioned on the plunger, the amature is guided by the piston within the valve component housing.
By providing between the solenoid component and/or the valve component and the support a seal, it is possible to eliminate all seals for sealing the magnetic ground element, the coil, and the yoke.
By arranging the second seal between the solenoid component housing and the connector pin, further seals for sealing the plug part relative to the solenoid component housing can be eliminated. The seal can be, for example, a simple O-ring.
The connector pin may be embodied as an inexpensive component when using a round pin. By crimping one end of the round connector pin, the required rectangular cross-section of the pin portion is provided. The remaining portion of the connector pin maintains the circular or round cross-sectional shape so that in this area a conventional inexpensive O-ring can be used for sealing the connector pin.
By guiding the amature by means of the piston within the valve component housing, expensive bearings for the plunger can be eliminated.
By eliminating a plurality of seals and bearings, the inventive solenoid valve is constructively simplified. Furthermore, it has a relatively small constructive size and can be designed to be very small. Accordingly, the inventive solenoid valve can be used with advantage in modular systems in which a plurality of solenoid valve units are to be provided.


REFERENCES:
patent: 4988073 (1991-01-01), Cristiani
patent: 5636908 (1997-06-01), Yamamuro
patent: 5788343 (1998-08-01), Kurtz et al.

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