Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Reexamination Certificate
1996-04-26
2001-09-11
Allen, Stephone B. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
C073S114220
Reexamination Certificate
active
06288409
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method for measuring the lift of a valve needle and a resulting simplified adjustment of the static volume of the media flow delivered during the open setting of an electromagnetically actuated valve.
BACKGROUND INFORMATION
the case of known, so-called bottom-feed, or side-feed injection valves, it is possible to measure the lift of a valve needle only through considerable expense, for instance, using a mechanical lift sensor, such as a measuring pin, given an installed restoring spring, against whose spring energy the injection valve is opened. In some cases, such a measurement is not even possible.
German Published Patent Application No. 40 23 828 describes a bottom-feed injection valve, in which the restoring spring does not have to be accessed to adjust the dynamic volumetric media flow. Rather, the restoring spring has a constant, preset spring energy. The dynamic volumetric media flow is adjusted by altering a magnetic restrictor constructed in the magnetic circuit. A magnetically conductive material, which alters the magnetic properties of an internal pole, is introduced into an internal pole of the injection valve to vary the magnetic force until the actual measured dynamic quantity (volume) delivered by the valve conforms with a specified, desired dynamic volume.
To adjust the static volumetric media flow during the open setting of the valve needle, it is necessary for the volumetric media flow sprayed off to be measured during a predetermined time and for the lift of the valve needle to be altered by shifting the valve seat member. A so-called “wet” adjusting method of this type is not only expensive, but also requires a later cleaning of the injection valve. It is not possible to directly measure the lift of the valve needle using known feelers because of the small diameter of the spray-off holes.
SUMMARY OF THE INVENTION
An advantage of the method according to the present invention is that by applying a simple, very exact, contact-free and dry measuring method, it is possible to measure the lift of a valve needle, even when only very small cross-sections are available inside an injection valve for the measurement, so that a simple, precise and cost-effective adjustment of the valve is rendered possible without the risk of contamination with respect to its static volume of the media flow to be delivered.
Particularly advantageous for measuring the lift of the valve needle of the valve is the application of a laser system, which enables laser beams to be directed through spray-off holes of an apertured spray disk onto a valve-closure member that is permanently joined to the valve needle. The lift of the valve needle is then measured as a differential measurement, in that at least the linear measured values measured in both end positions of the valve needle are considered.
It is advantageous that the lift of the valve needle can be measured given a dry valve. One can dispense with measuring the static volumes of the media flow by correlating the measured values of the valve-needle lift and the static volume of the media flow, the latter being defined, thus making an exact adjustment possible.
Moreover, it is advantageous that the danger of contamination is greatly reduced. The method according to the present invention functions in a contact-free manner. The lift adjustment takes place only after all sealing parts have been assembled in the valve and is rendered possible by the prestressing of the restoring springs.
It is especially advantageous when two laser beams are directed simultaneously into two spray-off holes of the apertured spray disk or when one laser beam is sent out with a time delay through two spray-off holes, i.e., one after the other. This substantially eliminates measurement errors caused by the play in the guidance of the valve-closure member. The lift of the valve needle follows from the sum of the two differential measured values attained through the two spray-off holes, divided by two.
REFERENCES:
patent: 3739177 (1973-06-01), Ko
patent: 4667511 (1987-05-01), Mausner
patent: 4793313 (1988-12-01), Paganon et al.
Maier Stefan
Schindler Frank
Stilling Joachim
Allen Stephone B.
Kenyon & Kenyon
Robert & Bosch GmbH
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