US2346469A - Refrigerating system - Google Patents

Description

Patented Apr. 11, 1944 UNlTED STATES PATENT OFFICE REFRIGERATING SYSTEM Franklyn Y. Carter, Detroit, Mich, asslgnor to Detroit Lubricator Company, Detroit, Mich a corporation of Michigan Application March 27, 1942, Serial No. 436,408

3 Claims.

This invention relates to new and useful improvements in refrigerating systems and, more particularly, to a system including an evaporator for refrigerating a water cooler.

In the refrigerating of water coolers which are positioned in a space or in an ambient medium having a temperature lower than the tem; perature of the water cooling evaporator, it is necessary, when using a thermostatic expansion valve of the gas-charged type, to provide means to maintain control of the expansion valve in accordance with the temperature of the evaporator outlet. Unless some such means is provided, the limited volatile liquid charge in the power element bulb or feeler member will condense into the powerelement or tubing connected to the bulb so that the expansion valve Y will be rendered inefie'ctive.

It is, accordingly, one object of this invention to provide means for maintaining the expansion valve in control of the admission of refrigerant to the evaporator.

The invention consists in the novel cooperative relation of parts to be more fully described hereinafter and the novelty of which will be particularly pointed out and distinctly claimed.

In the accompanying drawing to be taken as a part of this specification there is fully and clearly illustrated a preferred embodiment of the invention, in which drawing:

Figure 1 is atop plan view of a water cooler having the invention applied'thereto, and

Fig. 2 is a view of the-water coolerpartly in section and shown as operatively connected in arefrigerating system and positioned in a refrigerated space.

Referring to the drawing by characters of reference, l designates a room or. chamber, such as a butcher box, wherein the interior space 2 isto be maintained substantially at a water freezing temperature, say 32 to 32 F. Positioned within the space 2 there is a water cooler 3 which may be of the drum type containing a copper coil evaporator 4 having an inlet 5 and an outlet 6. A thermostatic expansion valve 1 which may be of any of the well known forms now on the market and which is of the gas-charged type controls the supply of refrigerant to the evaporator inlet 5. The valve 1 is fed from a refrigerant liquid line or conduit 8 which is connected to the outlet of a compressor-condenser unit 9. From the evaporator outlet 6 a suction line or outlet conduit l0 connects to the inlet of the unit 9 so that a refrigerant circulatory system is a back pressure limiting valve II which is set to maintain the evaporator temperature at a temperature above 32 F. and preferably in the neighborhood of 38 to 40 F. The interior of the cooler 3 is supplied with water from the usual "service main by a water inlet pipe I! which has a portion of its length, as at l3, wrapped around and in intimate heat exchange relation with the expansible hollow power element H of the valve I. The supply pipe I! discharges into the interior of the cooler 3 adjacent its bottom or lower end, as at IS. The power element It is controlled by a hollow temperature responsive bulb element It which extends into the evaporator adjacent its outlet to the conduit l0 so that it is in intimate heat exchange relation with the refrigerant leavmitting tube ll may have heat exchange contact therewith substantially at its point of leaving the evaporator outlet, as at l8. The tube I1 is wrapped around the pipe I2 or otherwise secured in intimate heat exchange relation therewith substantially to the point of connection of the tube II to the power element H. The tube ".and the power element It will thus be warmed by the inflowing water in the supply pipe II. The cooler 3 is provided with a water discharge pipe I! which may be provided with a faucet 20 and. if desired may lead outside of the room i.

The operation of the system is as follows. When the faucet 20 is opened to draw water from the cooler 3, the volatile liquid may have condensed into the tube H or power element ll so that the valve I will be held in closed position. However, as soon as water is drawn from the cooler 3, warm incoming water will flow through the pipe l2, thereby raising the temperature of the tube IT and the power element It so that volatfle liquid which may have condensed in the tube I1 and element It will now be vaporized. In normal operation, the water in the cooler 3 which is at a temperature below that of the warm incoming water in pipe I2 will cause at least a part of the volatile liquid vaporized in tube, II to condense at the control point, namely in the bulb element it. It now the temperature at the II outlet of the evaporator is above the desired tem- April 1944- H. H. CARY ETAL 2,346,470

METHOD OF MAKING GLASS ELECTRODES Filed Aug. 2, i940 J5 3 3 54 SW ll. m fi FOP THE 1-7)?!" A T TO ems KS.

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