Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – Reciprocating
Patent
1996-11-26
1998-10-20
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
Reciprocating
239584, 25112914, 25112915, 25112921, B05B 130, F16K 3102
Patent
active
058234454
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic fluid valve especially applicable in fuel injectors for internal combustion engines. More particularly, this invention relates to a fuel injector that uses an unguided spherical magnetic valve member as shutter, said valve member being biased to its closed position mainly by hydrodynamic forces.
Unguided spherical valve members have been used to provide high performance operation to fuel injectors at a lower production cost. And, among known fuel injectors using unguided spherical valve members, some designs use hydrodynamic forces to bias the shutter to the closed position, due to the high reliability and overall simplicity that this biasing force ensures. These features have enabled the obtention of lower cost valve assemblies.
Examples of these latter are disclosed in EP-A-0063952 and EP-B-0572428. EP-A-0063952 discloses a fuel injector comprising a hollow body, a solenoid core, which is one of the magnetic poles of the electromagnet, a guideless spherical shutter positioned within an aperture in a manner that the greatest cross sectional area of said shutter is always positioned within said aperture, being that the periphery of said aperture forms the other magnetic pole of the injector, so that the magnetic flux will flow from the solenoid core through the shutter to the periphery of the aperture then through the body of the injector. EP-B-0572428 discloses a fuel injector comprising a guideless spherical shutter seatable on a magnetic valve seat to stop the flow of fuel through the injector, a magnetic core and a body, being that the magnetic flux flows from the magnetic core to the shutter, through the magnetic valve seat and through the body of the fuel injector.
In these examples of fuel injectors featuring unguided valve members, the housing is part of the active portion of the fuel injector, since it is responsible for closing the magnetic circuit. It has been found, however, that having the housing as part of the active portion of the injector has drawbacks. First of all, it implies that each injector in the production line can only be tested and calibrated once it has been completely assembled, for only at this point in the manufacturing sequence is the injector operational. Moreover, an external metal housing implies relatively high material quantities and precision machining. As a result, although the concept of the injectors disclosed in these patents lowered the costs of the valve assembly, they did very little for the cost of the overall assembly of the fuel injector.
U.S. Pat. No. 5190223 discloses an injector which may, in one of its possible embodiments, use an unguided magnetic valve member as a shutter, which has a non-magnetizable casing solidly joined to the magnetic pole and the valve seat, forming a cartridge placed inside the housing, being that the magnetic return is by way of at least one magnetic return element, which may be formed as a cap open on one side or as a bracket. Calibration of an injector according to U.S. Pat. No. 5190223 is obtained by changes in a calibration air gap existing between the magnetic pole and the return element.
In such a fuel injector, a certain improvement to the assembly procedure is achieved, thanks to the cartridge assembly, however, the use of non-magnetizable material as the supporting structure of said cartridge assembly will result in poor magnetic response due to eddy-current generation in said supporting structure. Moreover, the cartridge assembly cannot be separately tested for electromagnetic behaviour, since the electromagnetic behaviour of the injector will only be determined by the finished assembly, including the solenoid, the return element and, in a very sensitive manner, by the exact air gap between the magnetic pole and the return element. As a result, only when the cartridge is assembled into the rest of the components of the magnetic circuit can said cartridge assembly be tested magnetically. Besides, since the cartridge assembly can only be test
REFERENCES:
patent: 3856260 (1974-12-01), Giordana
patent: 4252094 (1981-02-01), Draxler
patent: 4474332 (1984-10-01), Kaska
patent: 4531679 (1985-07-01), Pagdin
patent: 4938451 (1990-07-01), Weaver et al.
patent: 5692723 (1997-12-01), Baxter et al.
Evans Robin O.
Kashnikow Andres
LandOfFree
Fuel injector with electromagnetically autonomous sub assembly does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fuel injector with electromagnetically autonomous sub assembly, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fuel injector with electromagnetically autonomous sub assembly will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-235740