UNITED STATES PATENT OFFICE
DAVID FORBES KEITH, OF TORONTO, ONTARIO, CANADA
REFRIDGERATING DEVICE
Application filed June 27, 1927. Serial No 201,904,
My invention relates to refrigerating devices operating upon the absortion
system, and more particularly to units which are separable from the freezer
boxes or other coolers in which they are intended to be employed.
While my device is a departure in some of it principles of operation from
standard absorption systems, in that there are no check valves employed
by me, it operates through a similar cycle to all intermittent absorption
systems, this is to say. I provide two receptacles, one a generator-absorber,
which contains a suitable liquid, such as water and the other an evaporator-condenser,
which contains a suitable refrigerant, such as ammonia, with suitable connecting
paths between the two receptacles so that when the generator-absorber is
heated , the gases will pass over into the evaporator-condenser receptical,
by one path, and when the generator-absorber is permitted to become cool,
it will reabsorb the gases, as they volatilize in the evaporator-condenser
receptical, said gases pass back and are absorbed in the liquid in the
generator-absorber, with the result of absorption of heat (production of
cold), within and about the evaporator-condenser receptical.
As intimated above, one of my objects is to provide a refrigerating unit
of light weight. Another object is to provide means in connection with
a novel arrangment which guides the user in locating the unit during the
generation period, the refrigerating period, and in draining back the water
of condensation into the generator-absorber, for the retention of sufficient
liquid to serve the function of a seal when the device is in operation.
Other objects are to provide a system of absorption which operates efficiently
without the use of mechanical valves, to provide a method of dehydrating
and cooling the gas passing from the generator-absorber and it's surroundings.
It is also my object to provide a simple and effective method of attaching
metal fins to the generator shell.
A general object of my invention is to provide a structure which will be
simple to make, and fool-proof in operation, and which can be readily moved
about during the respective periods of generation and absorption, so that
the generator-absorber can be placed over a flame, during generation, and
the evaporator-condenser be placed into a water vessel during condensation
and a suitable box, vessel or receptical during the evaporation and absorption,
with the generator-absorber on the outside of the said box, in the last
instance. In this connection it is my object to make the two main recepticales
of spherical shape and light in weight and to connect them by means of
tubular means which will serve as a support for the device when in use,
and to which a handle for moving it about may be applied.
It is my object to provide for an automatic warning which will indicate
by sound or change in color, when the operation of generation has been
completed.
It is my object to provide in connection with the evaporator-condenser
element for a simple mode of freezing desired materials in a "tray".
It is my object to provide in connection with my device for a simple means
of assuring a proper cooling action in the evaporator-condenser element
during condensation, preferably by means of a suitable circulation device
in the nature of a dome which sets up cooling currects of water about the
evaporator-condenser shell, and a circulation throughout the entire vessel.
The above and various other advantages I provide by that certain construction
and arrangement of parts, of which a typical example will be hereinafter
more specifically pointed out and described, and the novelty of which will
be set forth in the appended claims.
In the drawings :-
Figure 1 is a central longitudinal section taken through the selected example
to be described, showing my invention.
Figure 2 is a perspective thereof.
Figure 3 is a section on the line 3-3 of figure 2, showing only the generator-absorber
shell.
Figure 4 is a detailed perspective of one of the cooling fins on the shell.