US2533562A - Devices for precipitating and drawing off annoying and harmful vapors and gases - Google Patents

Description

Dec. 12, 1950 G. DEIBEL 2,533,562

DEVICES FOR PRECIPITATING AND DRAWING OFF ANNOYING AND HARMFUL VAPORS AND GASES Filed Sept. 17, 1949 Q 7 Fl 2 f 11 ,8 14 I I g I T 47 In venfor:

\ jrfif kz Quad Patented Dec. 12, 1950 ING OFF ANNOYING VAPORS AND GASES v Gottfried Deibel, Dresden, Germany Application September 17, 1949. Serial No. 116,232 In Germany April 26, 1949 2 Claims. (01. 98-115) This invention relates to a device for precipiv tating and drawing off annoying and harmful vapors and gases.

To remove injurious vapors as produced for instance in chemical plants, and particularly in the laboratories thereof, hoods and similar devices of known type are used. They are found also in dental laboratories and other small-scale workrooms and are made as a rule of acid-proof ceramic materials. Such hoods are usually provided with an outlet pipe, a discharge bottom and a receiver for the condensates'precipitated and running down on the inner walls of the hood, as shown for example in German Patent No. 650,402. Ceramic devices of this class have been found to be generally satisfactory in use, though they still suffer from certain drawbacks which the present invention seeks to overcome.

A known device of the type described comprises a separately formed top part containing an out let pipe and a separately formed lower part including a receiver, the two parts being then assembled and placed in a firing furnace. This method involves unavoidable variations owing to differences in the composition of the ceramic masses and in their moisture content after molding with the result that stresses develop when the parts are united by firing and cause a considerable amount of waste.

Cracks, fissures and breakage produced by firing and responsible for the high percentage of waste have of course the effect of raising the cost of the devices free from such defects. Furthermore, the bottoms of the known devices have surfaces sloping towards the center and therefore cannot hold a plurality of burners and reagent basins placed thereon, though this is desirable or necessary in many instances. To overcome this drawback in practical operation an extra plate has to be put on the bottom to act as support for burners and basins. Another defect is the bulky size of the known devices representing a single ceramic unit which may be easily broken in transit.

According to the invention the drawbacks mentioned are overcome by constructing the device of two separately formed and fired ceramic parts, viz. a main top part limited below by a bottom serving also as support and a base fitted with discharging faces leading to an insertable receiver. Owing to this two-part construction, the amount of waste during firing is reduced to a tolerable minimum, and the two parts can be more easily transported and are less exposed to fracture or damage than a single ceramic body.

AND HARMFUL The device as contemplated by the invention permits also, according to its size, the easy insertion of a plurality of burners and basins.

The top part to be connected to an outlet pipe has an edge portion overlapping the base, the union of the parts being effected by acid-proof cementing. The parts can be readily combined at the place where the device is to be installed without requiring expert assistance. In the manufacture of a device according to the invention any suitable material, such as white ware, porcelain, glass, etc. may be employed.

The invention is illustrated by way of example in the accompanying drawing, in which Figure 1 is a vertical cross section, partly in elevation, on the line II of Fig. 2; and

Fig. 2, a section on the line II-II of Fig. 1.

The hood-shaped device comprises the two separately formed and fired parts II), II. The top part I0 connects in known manner with the outlet pipe l2 leading to a chimney or exhauster, not shown, and is limited below by the bottom l3 simultaneously made with the rest of the top part and provided with a horizontal upper plane surface I4 which acts as support for a plurality of reagent basins I5 with their burners l6 and a tripod 16.

The bottom i3 slopes towards the center and possesses channels or grooves I! for guiding condensates and, especially, liquid overflowing from the basins 5 to a central opening l8 whence they pass into the receiver l9. As seen the bottom l3 has a generally pyramidal lower surface and the channels l1 through the upper surface extend at their bottoms along such pyramidal lower surface.

A slide 20 preferably formed of a pane of glass serves for closing an opening for introducing and removing basins.

The separately formed and fired base H is made of acid-proof ceramic material. The part 10 to be placed on the base I l is fitted on its lower rim with an edge member 2| overlapping the correspondingly dimensioned base II and united therewith by acid-proof cementing. The receiver 19 for collecting condensates and liquid overflowing from the basins I5 is inserted in the base II and rests therein on the bottom 22 provided with lateral guides 23. The guides 23 are connected with the wall of the base H by inclined walls 24 which continue to extend horizontally towards the base wall and thus form a good support for the bottom of the top portion Ill. The bottom 25 completes the construction of the base ll.

I claim:

1. A device for precipitating and drawing off annoying and harmful vapors and gases developedduring boiling of acids and the like, said device comprising a casing of acid-proof ceramic material having a discharge plate at the bottom thereof and having a hood portion at the top thereof, said hood having an outlet pipe affixed thereto, and said plate having a central opening therethrough, and having a horizontal top plane surface and a generally pyramidal lower surface having inclined channels through the upper surface of said plate, the bottoms of said channels extending along said pyramidal lower surface, said channels leading from adjacent the periphery of said plate to said opening, a base supporting said casing, and having ,an opening in the side wall thereof, a removable receiver in said base insertable through said opening and a channel shaped support in said base to carry and position the receiver beneath said central opening in said discharge plate.

2. The combination set forth in claim 1 in which said casing has a depending flange at the lower edge thereof overlapping the outer wall of said base and secured thereto.

GOTTFRIED DEIBEL.

- REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,085,297 Deibel June 29, 1937

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