Fluid handling – Processes
Patent
1992-03-13
1993-06-08
Rosenthal, Arnold
Fluid handling
Processes
25112918, 25112915, F16K 3106
Patent
active
052170365
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is based on a method for adjusting the dynamic fluid flow quantity output during the opening and closing process of an electromagnetically actuatable valve, and an electromagnetically actuatable valve, as define hereinafter. In known valves, the dynamic fluid flow quantity output during the opening and closing process is adjusted by varying the magnitude of the spring force of a restoring spring acting upon the valve closing body. The valve known from German Offenlegungsschrift 37 27 342 (U.S. Pat. No. 4,832,314 ) has an adjusting bolt displaceably disposed in a longitudinal bore of the inner pole; one end of the restoring spring rests on one face end of this bolt. The depth to which the adjusting bolt is pressed into the longitudinal bore of the inner pole determines the magnitude of the spring force. German Offenlegungsschrift 29 42 853 discloses a valve in which the spring force of the restoring spring is adjusted by the depth to which an adjusting screw that can be screwed into the longitudinal bore of the inner pole is installed. One end of the restoring spring rests on one face end of the adjusting screw.
However, adjusting the dynamic fluid flow quantity output during the opening and closing process by adjusting the spring force of the restoring spring acting upon the valve closing body has the disadvantage that in the finally installed valve some capability of access to the restoring spring, in the form of an easily accessible adjusting element, must be provided, and then must additionally be sealed off.
Moreover, the range of variation of the spring force of the restoring spring is limited on the one hand by the force of attraction of the magnetic circuit and on the other by the effect on the tightness of the valve seat.
ADVANTAGES OF THE INVENTION
The method according to the invention and the electromagnetically actuatable valve have the advantage of a particularly simple, automatable adjustment of the dynamic fluid flow quantity of an electromagnetically actuatable valve output during its opening and closing process, which requires no capability for access to the restoring spring. That is, the finally installed valve no longer requires any capability for access to the restoring spring. Instead, the restoring spring has a constant, preset spring force.
The adjustment of the dynamic fluid flow quantity is done by varying a magnetic throttling action. The cross sections of the magnetic circuit, that is, the cross sections of the inner pole, an armature cooperating with the inner pole, the valve jacket and the housing cap, are designed such that the critical magnetic throttle cross section defining the magnetic force in the excited state, preferably embodied as a saturation cross section, is located in the region between the valve jacket and the housing cap. If the housing cap and the valve jacket are moved relative to one another, the magnetic throttling and the magnetic flux of the magnetic circuit then vary, and thus the magnetic force determining the dynamic fluid flow quantity varies as well.
The adjusting process can be fully automated and is thus well-suited for large-scale mass production.
Advantageous further features of and improvements to the and the valve are possible with the provisions recited hereinafter.
For simple, accurate and automatable adjustment of the dynamic fluid flow quantity output during the opening and closing process, it is especially advantageous if the housing cap protrudes axially from the valve jacket, and the housing cap and valve jacket are displaced axially relative to one another to vary the overlap between the housing cap and valve jacket that influences the magnetic throttling.
For the same reason it is also advantageous if at least one partially encompassing recess is formed out of the housing cap and if another such recess is formed out of the valve jacket, and the housing cap and valve jacket are rotated relative to one another in order to vary the overlap of the housing cap and valve jacket that influences the
REFERENCES:
patent: 4947887 (1990-08-01), Fox
patent: 4967781 (1990-11-01), Baron
patent: 5065979 (1991-11-01), Detweiler et al.
Greigg Edwin E.
Greigg Ronald E.
Robert & Bosch GmbH
Rosenthal Arnold
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