Chemical apparatus and process disinfecting – deodorizing – preser – For deodorizing of – or chemical purification of – or... – Including means adding material into environmental gas
Patent
1984-05-09
1987-09-15
Lacey, David L.
Chemical apparatus and process disinfecting, deodorizing, preser
For deodorizing of, or chemical purification of, or...
Including means adding material into environmental gas
422305, 422306, A61L 904
Patent
active
046938680
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a thermal fumigator for drugs such as insecticides, fungicides, room aromatizers, and deodarants.
DESCRIPTION OF PRIOR ART
Devices such as electric mosquito killers which fumigate a room interior by heating a mat impregnated with drugs such as insecticides thereby releasing the drugs in fume form from the mat, have been known to the art. Since these devices utilize electricity as a heat source for heating the mat, they inevitably suffer from complicated construction. The use of electricity entails a disadvantage that the devices require electric cables for their power sources and, consequently, their uses are limited to those places which are provided with electric power.
Although the practice of keeping mosquito coils burning outdoors for protection against insect bites has been popular, unfortunately this practice is not necessarily safe because it inevitably requires the continuous presence of fire at the leading ends of such mosquito coils until the desired protection becomes no longer necessary.
A liquefied gas fumigator designed to operate on the principle of the pocket warmer has also been known in the art. In this fumigator, the principle of the pocket warmer (in which the fuel such as benzene is converted into a heat-carrying vapor by combustion aided by a wad of asbestos impregnated with a catalyst such as platinum or palladium) is diverted without any alteration to fumigation of an insecticide. Although this principle is completely satisfactory for the purpose of retaining warmth, it is not fit for an insecticide fumigator which must maintain accurate temperature control.
This known method suffers from the disadvantage that it fails to attain the object of retaining a constant temperature level because:
(1) a platinum impregnated wad provides no homogeneous catalytic action and
(2) a supply of oxygen is not uniform enough to permit formation of a uniform mixture of the fuel with oxygen.
SUMMARY OF THE INVENTION
This invention originated in the determination to eliminate the aforementioned drawbacks inherent in the conventional thermal fumigators for drugs and preclude the danger due to the use of fire. It provides a catalyst-heating type thermal fumigator for drugs which utilizes as its heat source the reaction heat caused when a volatile fuel (such as alcohol) or a liquefied gas fuel (such as liquefied petroleum gas or dimethyl ether) is brought into contact with a catalyst of platinum or palladium in air. It is simple in construction and does not need a cable for power source connection and imposes no limitation on the selection of places of use.
The thermal fumigator for drugs (hereinafter referred to as "thermal fumigator") of the present invention is characterized by a case having a receptable for a volatile fuel or liquefied gas fuel, a metal catalyst disposed above the aforementioned receptacle across a proper intervening space, and a heat radiating plate disposed above the aforementioned metal catalyst across said space and adapted to permit thermal release of a drug. It is further characterized by a passage in the aforementioned case for supply of air and release of combustion gas.
In another aspect, the thermal fumigator of this invention is characterized by a case having a container for sealing a liquefied gas, a nozzle communicated via a valve with the aforementioned container, a metal catalyst disposed at a position where the gas escaping from the nozzle collides with the metal catalyst, and a heat radiating plate disposed near the aforementioned catalyst and adapted to permit thermal release of a drug. Also provided in the case is a passage for supply of air and release of combustion gas and a control means for regulating the opening and closing of the aforementioned valve.
The thermal fumigator of the present invention accomplishes the heretofore unattainable uniform retention of effective temperature by interposing a fixed space between the fuel container and the metal catalyst to ensure thorough mixture of the fuel gas
REFERENCES:
patent: 247480 (1881-09-01), Carpenter
patent: 3043245 (1962-07-01), Herbert et al.
patent: 3923458 (1975-12-01), Moran
patent: 4163038 (1979-07-01), Nishimura et al.
patent: 4171340 (1979-10-01), Nishimura et al.
patent: 4458662 (1984-07-01), Barnett
Katsuda Yoshio
Mashine Hiroyoshi
Yoshinaga Sadao
Dainihon Jochugiku Co., Ltd.
Lacey David L.
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