Optics: measuring and testing – For light transmission or absorption – Of fluent material
Patent
1999-06-01
2000-10-24
Pham, Hoa Q.
Optics: measuring and testing
For light transmission or absorption
Of fluent material
G01N 2100
Patent
active
061375829
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to device for measuring aerosol concentrations in a chamber or machine.
2. Description of the Related Art
Monitoring of aerosol concentrations, especially lubricant mist in the drive spaces of internal combustion engines or in the housings of power trains, for example, in printing presses, is of major importance in avoiding damage, since a rapid rise in the oil mist concentration suggests rupture of the lubricating film. Because of the heat of friction that then develops, oil vapor is formed, which recondenses to oil mist in the drive space and thus leads to a rapid rise in oil mist concentration. An incipient hazard can be recognized from this and further damage avoided by appropriate measures, for example, stopping of the machine.
In addition to the already described oil mist formation, so-called blow-by can occur in piston engines between the piston and cylinder wall as a result of damaged piston rings, owing to lubricating film tears in the bearings, which, if not recognized in time, lead to seizing of the pistons. An increase in oil mist density with a simultaneous temperature rise as a result of the hot combustion gases reaching the crankshaft housing suggest blow-by.
Devices to indicate oil mist concentrations in the drive spaces of internal combustion engines are known (EP-B-0 071 391), in which the oil mist is withdrawn by suction from the drive space and passed through a chamber that contains a device to measure absorbance. The significant design and operating expense (e.g., pumps, maintenance), the possible de-mixing of the aerosol "oil mist" on the way to and through the chamber, and the time delay during measurement are drawbacks.
A device of the type mentioned at the outset is known from DD-A-239 474 or GB-A-2 166 232, in which a measurement probe is provided for each drive of an internal combustion engine, in which each measurement probe is directly arranged in the interior of the corresponding drive space and connected via an optical or electrical transmission path to a central evaluation unit situated outside of the internal combustion engine.
SUMMARY OF THE INVENTION
The present invention relates to a device for determining measured values in a chamber of a machine. The device comprises a housing of the machine, an evaluation device arranged outside of the housing, a measurement probe attached to the housing and extending into the chamber, an oscillating system having a line connected between the measurement probe and the evaluation device, and a support rail containing a bus rail with a bus line rail, the line connected to a bus coupler containing a converter arranged in the bus rail, the bus line rail arranged elastically within the support rail so that the system is tuned to a low frequency.
One advantage of the present invention is to incorporate the oil mist sensor device in a rapid assembly system.
Another advantage of the invention is to design the entire system water-tight enough that spray water cannot penetrate into the electrical circuitry during cleaning of the engines.
Yet another advantage of the invention is to protect the electronic converter system from damage by vibrations that are generated by the running engine, as well as electromagnetic influences from the outside and, on the other hand, to prevent electromagnetic radiation from being emitted outward from the electronic circuits.
The measurement probe can be designed to determine different measured values, like the temperature or other physical quantities. However, it is preferably designed to determine the concentration of an aerosol, especially an oil mist.
The measurement probe can be directly connected to an evaluation unit or to a bus rail via a bus coupler. The bus rail can be connected to a converter and an evaluation unit for the measured signals. The bus coupler is preferably designed directly as a converter and the bus rail connected to an evaluation unit.
BRIEF DESCRIPTION OF THE DRAWINGS
The above-mentioned and othe
REFERENCES:
patent: 4917491 (1990-04-01), Ring et al.
patent: 5510895 (1996-04-01), Sahagen
Electrical Engineering Company Ltd.
Knuth Randall J.
Pham Hoa Q.
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