Chemical apparatus and process disinfecting – deodorizing – preser – Analyzer – structured indicator – or manipulative laboratory... – Means for analyzing liquid or solid sample
Patent
1986-12-10
1988-05-10
Joyce, Harold
Chemical apparatus and process disinfecting, deodorizing, preser
Analyzer, structured indicator, or manipulative laboratory...
Means for analyzing liquid or solid sample
98 211, 422 83, B60H 306
Patent
active
047427639
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a device for the detection of noxious substances in the air supplied to a compartment to be occupied by people, preferably the cab of a motor vehicle, by using one or several sensors and for the indication and/or control and/or adjustment of filter arrangements and/or ventilation systems in relation to the measured value, are respective measured values, detected by a sensor, or respective sensors.
BACKGROUND OF THE INVENTION
In order to eliminate the noxious substances contained in the air supplied to a compartment occupied by people, it is first necessary to detect them and then to produce signals or control outputs in order to switch on or off--the filtering systems and/or the ventilation systems.
It has already been proposed to provide analyzers, which however are comparatively expensive to acquire and to operate, not to mention that they are capable of detecting only separate components of noxious substances.
Further, it is known to use semiconductor sensors for these purposes, which meet the general requirement to respond to the usual air pollutants. However, the range of responsiveness of these sensors lies well above the objectionable level of concentration of many noxious substances to which people are subjected. Besides, semiconductor sensors are sensitive to temperature fluctuations and differences in flow velocity of the air streams to be analyzed. Furthermore, the response time of these sensors, particularly in the case of low concentrations, and their decontamination time are too high for their use for instance for the control of filter systems and/or ventilation systems in motor-vehicle cabs.
OBJECT OF THE INVENTION
Departing from this state of the art, the invention has the object to provide an economical and maintenance-free installation with low space requirements, avoiding the aforementioned disadvantages, which responds to all the usually occurring air pollutants and insures a dependable reading.
SUMMARY OF THE INVENTION
In accordance with the invention, this object is attained due to the fact that the sensor is placed in a housing and within this housing, in front of its side exposed to the oncoming stream, a measuring slot for the passage of the air streams to be surveyed is provided, leading to an air chamber of the housing wherein a pulsator is mounted, whereby one or several air-inlet openings abut in the cylindrical area of the air chamber facing away from the sensor. Due to this configuration, it is possible to feed the sensor only a predetermined amount of air, so that the sensor can furnish the desired reading, independently from the variations in the flow velocity. The used oscillatory pump system insures a constant air flushing of the sensor and leads to the shortening of the decontamination time.
Advantageously, one or several air-outlet openings lead from the cylinder area of the air chamber facing the sensor, so that an extensively uniformized and constant air flow hits the sensor.
In the area downstream of the sensor, air-outlet channels are provided in a wall of the housing, through which that portion of the air entered the housing, which effected the impact on the sensor, can exit.
The pulsator consists of a piston coupled with an oscillator, whereby the oscillator preferably constitutes the final portion of the housing facing away from the sensor, so that altogether a very compact construction unit results.
According to a further feature of the invention, in different flow directions, the piston presents different flow resistances. When the piston is set to oscillate, it produces a directed air flow which is aimed at the sensor through the measuring slot. For this purpose, the piston is provided on its outside with a saw-tooth-shaped profile, so that the widened portions are aligned in the direction of the sensor. Through the piston oscillations a predetermined air flow is created, whereby at the same time the absorption into the housing of the air to be surveyed is effected.
The air-inlet and air-outlet openings
REFERENCES:
patent: 2899282 (1959-08-01), Eyraud
patent: 3088809 (1963-05-01), Boatman
patent: 4170455 (1979-10-01), Henrie
patent: 4581988 (1986-04-01), Mattei
patent: 4610703 (1986-09-01), Kowalczyk
Dewert Heribert
Gresch Heinrich
Holter Heinz
Igelbuscher Heinrich
Dubno Herbert
Holter Heinz
Joyce Harold
Lianides Ronald
Ross Karl F.
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