US 2496816 A
Description (OCR text may contain errors)
Feb. 7 1195 P. SGHLUMBOHM REFRIGERATION Filed Dec. 20, 1945 INVENTOR.
Patented Feb. 7, 1950 a 2,496,816
2 ,496,816 I t REFRIGERATION Peter Schlumbohm, New York, N. Y. Application December 20, 19l5rSerial No. 636,143
2 Claims. (01. 62-92) The present invention refers to refrigeration as in accordance with the instant invention the and more specifically to temperature control. opening of the valve H is as described above. The invention is illustrated in the accompany- In this invention such a valve H is applied in ing drawing, and is applied to the specific task a new manner. Instead of feeding liquid refrigof maintaining the temperature of a walled space erant into the evaporator it is used to blow of! constant at a predetermined level. refrigerant vapor which leaves the evaporator 3. The invention makes it possible to control the Instead of operating the valve by the difference storage temperature in portable, heat-insulated, between th temperature of the liquid refrigerso-called containers, as used for railway and ant 5 in'the evaporator and superheated'refrigtruck shipments of less than carload size. Such erant vapor e alvell is in this case actuated containers do not allow much dead weight for by the difference between the temp e of t e the insulation of refrigeration equipment. It has liquid refrigerant 5 and the temperature of the not been possible to equip them with the powerair in the storage space I. This difference is a driven complete condensing unit and evaporator. matter of those degrees which are required as TD Dry Ice, brine hold over tanks or eutectic ice have (TD is the standard expressi n f r T mp r ure been the only practical means for cooling such Difference) as general temperature difference less-than-carload containers. Each of these for practising heat exchange throu a Wall means has t di5advantage which in this case is the wall of the container 3. The invention allows a temperature control as However, a rather wide range can be effective for exact as the one perfected in complete condens- 2o actuating valve H with this TD, depending on the ing units; yet no powered condensing it i location of the bulb l5 within the storage space quired in connection with the invention. I and depending on the availability of stirrin In the accompanying drawings Fig. 1 illustrates ventilating means to move the air of the storage the apparatus installed in a walled space. Space to Obtain a uniform mp ature Fig. 2 shows a cross-section of a thermal exhroughout the storage p All these factors pansion valve which is wn of Fig 1, are routine refrigeration factors and need not be In Fig 1 the storage space is insulated by 3 described in detail. For the chosen TD the valve wall 2 of insulating material. A refrigerating can be Set by operating the set-screw which conevaporator 3 serves as storage vessel for a refrigtrols the tension of the spri l'l.
erant 5 and is arranged in the upper part of the one deciding point in this new invention is to storage room I, arranged on a stand 4 hi make the apparatus operative to the effect of vessel 3 is preferably an I. C. C. regulation shipmaintaining a predetermined room temperature ping container for compressed gases and is in the storage sp e I by l wi fi n w refri equipped with a hut fi valve 5 and an t t, t erant 5 if the room temperature rises above the receive a conduit 9 of standard refrigeration tubchosen p nt- Merely placing the apparatus into ing and fittings. The conduit 9 is equipped with the storage p e I and op nin the shut-off a gauge 1, with a blow-off conduit l0, controlled v lve 6 While shut-off valve 8 is d d would my a hand valve 8 and with a second blow-off be without consequences. Valve ll would be conduit l2, is controlled by the thermal valve closed by the spri the r fri rant 5 in II. This thermal valve II with its thermal bulb the p ator 3 and the liquid in bulb l5 hav- I5 and capillary connection 14 is shown in deing the Same temperature and Compensating tail and in vertical cross-section in Fig. their pressures. An important step of the instandard valve in which the vention, therefore, is to cool down the refrigerbulb l5 acts on the upperside of ant 5 to a temperature which is lower than l8, while the other side of the diathe pr r n d f t re room temperature phragm is subjected to the combined pressures which shall be maintained. To give an example, of the refrigerant in conduit l2 and a spring if the room temperature shall b maintained at H. If the pressure of the bulb is stronger than 20 F., and if conditions require a TD of 10 F, those combined two pressures, the valve stem [6 for the heat exchange, the refrigerant 5 must be from the valve seat S and refrigerprecooled down to 10 F. to make the apparatus ant can pass from conduit l2 into conduit l3. operative. Cooling down the entire mass of the Opening of the valve II is in standard evaporator refrigerant 5 may be effected by various known temperature control effected by exposing the ways: For instance, the container 3 may be rebulb l5 to the temperature of superheated refrigfrigerated by independent refrigeration means erant a or which leaves the evaporator, wherebefore or while being installed in the storage space Or, valve 6 and conduit 9 may be opened the air within said storage space to said liquid reto blow off refrigerant until the mass of the refrigerant, controlling the release of said refrigerfrigerant 5 is cooled down. A gauge 1, a branch ant vapor in response to the temperature differconduit I and a hand valve 8 may supplement ence between the temperature within said storage the equipment for this procedure. Or, the bulb space and the temperature of said colder body frigeration jobs, such as in trucks. While in of an evaporator adapted to maintain a room may be o d d w y a ona y ref e lo refrigerant contained in sa1d evaporator, means and on the road ref i erant 5 may be blown Off for precoolmg sa1d refrigerant below the predein the controlled mannei as described, to maintermmed tempeiature to be maintained later in tain the temperature. said storage space, means for alternately opening Since non-toxic refrigerants like Freon and-- said container to effect evaporation of refrigerant with precautions-carbon dioxide may be blown and closing said container to eifect cessation of off into the surrounding air, these refrigerants evaporation of refrigerant, said means being reare especially suitable for this new cooling sponsive to the temperature difference between system. the temperature of the storage space and the Having now described the nature ofmy inventemperature of the colder refrigerant contained tion and given an example of the manner in in said evaporator. v which it may be performed, PETER SCHLUMBOHM.
I claim as my invention:
1. The method of cooling the-air of a storage 2 REFERENCES CITED space by utilizing vaporizame refrigerant The following references are of record in the prising confining the vaporizable refrigerant,;preme 7 of this patent;
in its liquid phase to a temperature-below a pre- UNITED STATES PATENTS determined temperature corresponding to the Number Name Date mperature to be maintained in said storage 2 7 Bergert June 30' 1908 space, releasing refrigerant vapor above the liquid 5 7 Bobrick 2' 9 refrigerant to said storage space which refrig- 2,039,423 Ross 10' 1937 crant vapor is formed by the transfer of heat of 2316392 Irwin 20' 1943