US1985252A - Refrigerating apparatus - Google Patents

Description

Deli 4- c. F HENN EiY 1,985,252

- REFRIGERATING APPARATUS I Original Filed Aug. 30 1950 2 Sheets-Sheet l INVENTOR I ATT RNEU A Dec. 25, 1934'. v c. F. HENNEY REFRIGERATING APPARATUS v Original Fi led Aug. -30, 1930 2 Sheets-Sheet 7 I a z Erw 112 I53 161 INV TOR IR TORNEYS metathesi I 1,985,252

v jusszsz ammosasrmo msas'rus Charles I. Henney, Dayton. Ohio, asslgnor to Frigidaire Corporation, Dayton, Ohio, a corporation of Delaware Application August so. 1030. Serial No. 418,91;

I Renewed March 11, 19:4

4 cisimsf (cl. sz-us) This invention relates to refrigerating appavided above the main part of the cabinet in which ratus and more particularly to that type of apis keptthe various syrups and flavors. Under paratus in which at least two evaporators are ordinary circumstances, it is generally desired to maintained at diflerent temperatures, or are so maintain the compartment at approximately is operated as to produce different temperatures in 34 F., the compartment 11 at approximately 40 5 refrigerated spaces. F., the compartment 12 at temperatures ranging An object of-this invention is to provide a refrom approximately 0 1". to 10 F., while the frigerating apparatus of the character above decompartment 13- is generally maintained at apk scribed in which operating eiiiciency is increased. proximately 50' F. 10 Further objects and advantages of the present Sometimes the compartment 12 is within itseli 10 invention will be apparent from the following deprovided with diii'erent temperatures, and, in this scription, reference being had to the accompanye instance, it 'may be accomplished by providing ing drawings, wherein a preferred form of the a partition 14 so that the brine on the left side present invention is clearly shown. may be maintained at 0 F. while the brine on 15 In the drawings: the right hand side may be maintained at apl5 Fig. 1 is a vertical cross-sectional view, someproximately 7 1. j v

what tic of an apparatus embodying In order to refrigerate the soda fountain, a features of this invention; 7 refrigerant liquefying unit is provided which Fig. 2 is a vertical cross-sectional view, someis connected by means 'of a liquid'refrigerant line 20 what tic of a'modifled form of the 21 with the evaporators hereinafter to be de- 20 invention; scribed and by the evaporated refrigerant line Fig. 3 is a horizontal cross-sectional view of the 22 which receives the refrigerant evaporated in UNITED STATES- PATENTOFFICE apparatus shown in Fig. 2: andthe evaporators and returns the same" to the unit Fig. 4 is a diagrammatic illustration of amodi- 20. The unit 20 may be of the compressor-con- 2s ned form of the invention. denser type, if desired, and thus includes a com- 25 I In an app r u wherein two evaporators have pressor 2a, a condenser 24, receiver 25, the latbeen connected to a single refriger n liquefyter being connected to the liquid refrigerant line ing unit it has been customary to" provide means 2L The compressor 'is operated by a motor 26 whereby diflerent temperatures'may be obtained which is started and stopped by means of a snap 80 from the diflerent evaporators. However, it has switch 2'! operated by the bellows 28 in a, m n- 30 s ner l r 119008881! to p te h ner hereinafter to be more fully described. r n qu fv s u in such a manner that sub- The soda fountain is provided with a plurality mt a a of the liqu vins p rati ns hav of evaporators, and thus includes a high p been 0811194 011 with 8 7 low back Pressure, sure evaporator 30, partly in the compartment 10 86 such back pressure usually corresponding to the and partly in the compartment 13, and a low Pressure M inthe l west temper tur pressure evaporator 31 partly-lathe compartment evaporator. According to this invention, bowis and paitly in the compartment 12. An exv r. i ilm to operate the high. mp mpansion valve 32 connects the line 21 with the tun mm evaporators at back pressures evaporator 30 and an expansion valve 33 con- 4 corresponding to their temperatures and to op-' nects the'evaporator 81 with the line 21. These 4 40 mi e 1 l w ba k PW 0111! wh mravalves are automatically controlled and are so artion is required in the low pressure evaporator ranged as to prevent flow of refrigerant into the or evaporators. evaporators at predetermined high pressure lim- Intbe apparatus-shown in Fig, i, as a specific its respectively and automatically open when the refrigerating means. The soda fountain, as here determined limits. ,I'hus the valve 32 automatishown,includesa c abinethavinginsulatedouter callyopenswhenthepressurewithintheevaposide,bottomandtopwailsand containinga comrator 30fsllstoapressurecorrespondingto34 F. partment 10 for cooling drinking water, carbonwhich with S0: is approximatelyfl pounds. The ated water and the like: a compartment. 11 for valve 38 automaticailyopens at a pressure correa cooling bottleddrinks and the like and a comsponding with 0' I. which with so, is 14 inches partmentHfOreoolingicecreama'ndothervacuM 1 foods requiring relatively low temperatures. The expansion valve 1 82 is provided with a also an insulated syrup rail or thermostatic controls! for closing said valve diagrammatieallyindicateda't 13,'isgenerallypr0- when a p low temperature has been embodiment, a soda folmtain is provided with press'uresin theevaporators drop below saidpre- 45 2 reached at a certain point in the high pressure evaporator. In this particular instance, the thermostatic control includes a bulb 35 connected to the valve 32 and is adapted to close the said valve when that portion of the evaporator 30 the evaporator 30 at the point shown immediately above the level 36 of the liquid in the compartment, so that the bulb is not cooled to the pre- I determined temperature until the liquid in cornpartment 10 reaches that temperature.

The compartment 10 is filled with water or some liquid of similar freezing temperature and .one or more coils 3'7 are placed in the compart- Y vice may, if desired, be omitted with the type of' ment 10 through which drinking water, carbonated water and the like flows and is cooled by the liquid in the compartment 10 which liquid in turn is cooled by the submerged cofls 30a of the evapo- 1 rater 30. I

The evaporator 30 continues in the form of a pipe 30b through the syrup rail 13 to a second valve 39. This valve preferably is of the snap acting type and is adapted to snap shut when the pressure in the evaporator 30 falls below a predetermined pressure,- said pressure, being below the pressure at which the valve 32 opens when not closed by the thermostatic control 34. The snap acting mechanism of the valve 39 is made responsive to the pressure within the evaporator 30,

for instance for diagrammatic showing, through the tube 40. Atype of valve suitable for valve 39 is disclosed in the application of Gilbert H.-

Williams, Serial No. 351,363, filed March 30,1929. The valve 33 is set to open and close at pressures which SSO: would be 12 pounds and 0 pounds respectively. The evaporator 31 has a valve 33 similar to the valve 32, also provided with a thermostatic device 41, although. this thermostatic demotor control shown in Figs. 1 to 3 inclusive. The thermostatic device 41 includes a bulb 42 connected to the outlet end of-the pipe which terminates the evaporator 31 and is connected to the valve 33 to close the same when the bulb 42- reaches a predetermined low temperature. The evaporator 31 is also provided with a check valve 43 connecting the low pressure evaporator 31 with the evaporated refrigerant line 22. The check valve 43 is so arranged that it permits fiow of the refrigerant from the evaporator 31 to'the line 22' but prevents the flow from the line 22 to the evaporator 31.

' Provisions for causing the refrigerant liquefye ing unit to operate in accordance with certain conditions in the evaporators is provided. Pref-- erably the unit 20 is controlled by condensation, before return to the unit, of refrigerant evaporated in the high pressure evaporator 30.] Thus a heat exchanging device 44 is constructed in the form of a downwardly directed loop in a pipe fromthe valve 39. This loop is in heat exchange relation to the evaporator 31. Control'means responsive to the device 44 is provided for controlling'the operation of the regfrigerant liquefying unit 20 and this includes a thermostatic bulb 45 adjacent the loop 44, the bulb 45 being connected by means of the pipe 46 with thebellows which operates the snap switch 27 which controls the motor. 26. when the valve 39 opens, evaporated refrigerant through the exchange device 44 and is-there condensed by reason of the a back pressure equal to the pressure at which the valve 32 is set to open. Refrigeration continues at this back pressure until such a time as the coil 30a adjacent the bulb 35 is cooled sumciently to close the valve 32 by the action of the bulb 35. when the valve 32 is closed the compressor quickly pulls the pressure of the evaporator 30 down to such a pressure that itwill cause the valve 39 to snap shut. When this happens the compressor 23 quickly pulls down the pressure in the line 22 to the point where valve 33 is opened permitting refrigerant to flow through the evaporator 31. run until such a time as, the brine in the compartment 12 is cooled suflici'ently 'to cause the bulb 45 to open the switch .27 and stop the com-' forms two-thirds of the work at the higher back pressure required in the evaporator '30. Since the difference in back pressure between the evaporators 30. and 31 is quite large, a substantial saving in operating cost is possible.

The evaporator 31 may also be used to aid in the cooling of the syrup rail 13., This is accomplishedby providing a few bends of coil 31a in the syrup rail before passing the pipe comprising the evaporator 31 in theform of coi1s 3lb and 31c around the sleeves in thewompartment 12.

The compartment 12 in this particular embodiment includes a brine tank and a plurality 'of sleeves 51, 52 and 53. The refrigerant after pass The corresponding parts of the refrigerating sys-' tern are similarly numbered in these figures, with the exception that has been added to the -numbers. Thus the liquid refrigerant line 121 in Fig.2 corresponds to the liquid refrigerant line,

21 in Fig. 1, the same being true with respect to all other corresponding numbers.

Inthe modification shown in Figs. 2 and 3 the sleeve 151, instead of being submerged in a brine tank, is encasedin a concrete casing 160. A large substantially square sleeve 152,153 is encased in' 16 requires refrigerant in the evaporator 30 and operates at The compressor thencontinues to pressor 23. In this system the' compressor pera concrete casing 161 and is provided witha con Y trol metal plate to divide it into sub-compartments and to provide-for conduction of heat. The casings 160 and 161 'are placed around the sleeves after the cofls 1315 and 1310 have placed around the sleeves 151, 152-153 respectively. The concrete is preferably quick drying' Portland cement used without any sand or other ingredients except water. If desired. the cofls 1315 and 131c may be'made of copper tubing with fins attached thereto. The fins if desired may be a continuous spiral strip wound around the pipe; The cement is dried after it has set. 1 The loop 144 together with the bulb 145 is placed immediately outside the sleeve 151 and is also embedded in the concrete sleeve 160.

The casings and 161 rest on the cork board bottom 163 and are spaced from each other by a slab or cork 164. A second slab of cork is placed ontheothersideofthecasinglw "after which loose ground cork 166 ispoured between the slabs of cork and the casings 180 and 161. In these modifications the compressing unit preferably is identical with that shown in Fig. 1.

Fig. '4 shows how either of the modifications shown in Fig. 1 or in Figs. 2 and 3 may be provided with a slightly'diiferent motor control. Thus the refrigerant liouefying unit 220 may correspond in Fig. 1, it being understood that sleeves are placed within some of the coils and that another coil is submerged in liquid corresponding to compartment 10. The details of the cabinet have been omitted in Fig. 4 in order to show more clearly the refrigerating system. V

The system shown in Fig. 4, is further modified with respect to the system shown in Fig. 1 by providing a "low pressure" control for the refrigerant liquefying unit 220. Thus the loop 44 and bulb-i5 have been omitted in Fig.4 and inlieu thereof the bulb 228 is actuated by the pressure in the evaporated refrigerant line 222, the bulb 228 merely being connected by a pipe 271 with the line 222, to be responsive to the pressure in the low side of the system.

While the form of embodiment of the invention as herein disclosed, constitutes a preferred CERTIFICATE OF Patent No. 98 5: 5

I CHARLES F. Harm.

and means for preventing the fiow of gaseous refrigerant from said evaporator to the other evaporators when said last named means permits the fiow of refrigerant fromsaid evaporator to the exhaust conduit.

2. Refrigerating apparatus comprising, in combination, a pair of evaporators connected in parallel circuit relation: a common exhaust conduit connected to outlets of said evaporators; means for withdrawing gaseous refrigerant from the exhaust conduit, liquefying the refrigerant and returring the liquid to the evaporators; means for permittingand preventing the fiow of refrigerant from the outlet of one of said evaporators to the common exhaust conduit; and a check valve connected between the outlet of the other evaporator and the exhaust conduit to prevent fiow from the exhaust conduit to said other evaporator.

3. Refrigerating apparatus comprising, in combination a pair of evaporators connected in parallel circuit relation; a common exhaust conduit connected to outlets of said evaporators; means for withdrawing gaseous refrigerant from the exhaust conduit, liquefying the refrigerant and returning the liquid 'to the evaporators; means responsive to the pressure of one of the evaporators for fully opening and positively closing its outlet to the exhaust conduit; and a check valve disposed between the outlet of the other evaporator and the exhaust conduit to prevent fiow from thelexhaust conduit to said other evaporator.

4. Refrigerating apparatus comprising, in comtor and the exhaust conduit to prevent fiow from the exhaust conduit to said other evaporator; and means responsive to pressure of the exhaust conduit for starting and stopping the liquefying means. I CHARLES r. CORRECTION.

December 25, 19 b,.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correotionas follows: Page 2, first column, line 37,. for "which SSO 'Y read whichwith S0 and that the said Letters Patent should be read with this correction therein that the same may conform to the record of .the case in the Patent Office.

' Signed and sealedthis 25th day of July, A. n. 19 9.

(Seal) 7' Henry Van Arsdale, Acting Commissioner of Patents.

which loose ground cork 166 ispoured between the slabs of cork and the casings 180 and 161. In these modifications the compressing unit preferably is identical with that shown in Fig. 1.

Fig. '4 shows how either of the modifications shown in Fig. 1 or in Figs. 2 and 3 may be provided with a slightly'diiferent motor control. Thus the refrigerant liouefying unit 220 may correspond in Fig. 1, it being understood that sleeves are placed within some of the coils and that another coil is submerged in liquid corresponding to compartment 10. The details of the cabinet have been omitted in Fig. 4 in order to show more clearly the refrigerating system. V

The system shown in Fig. 4, is further modified with respect to the system shown in Fig. 1 by providing a "low pressure" control for the refrigerant liquefying unit 220. Thus the loop 44 and bulb-i5 have been omitted in Fig.4 and inlieu thereof the bulb 228 is actuated by the pressure in the evaporated refrigerant line 222, the bulb 228 merely being connected by a pipe 271 with the line 222, to be responsive to the pressure in the low side of the system.

While the form of embodiment of the invention as herein disclosed, constitutes a preferred CERTIFICATE OF Patent No. 98 5: 5

I CHARLES F. Harm.

and means for preventing the fiow of gaseous refrigerant from said evaporator to the other evaporators when said last named means permits the fiow of refrigerant fromsaid evaporator to the exhaust conduit.

2. Refrigerating apparatus comprising, in combination, a pair of evaporators connected in parallel circuit relation: a common exhaust conduit connected to outlets of said evaporators; means for withdrawing gaseous refrigerant from the exhaust conduit, liquefying the refrigerant and returring the liquid to the evaporators; means for permittingand preventing the fiow of refrigerant from the outlet of one of said evaporators to the common exhaust conduit; and a check valve connected between the outlet of the other evaporator and the exhaust conduit to prevent fiow from the exhaust conduit to said other evaporator.

3. Refrigerating apparatus comprising, in combination a pair of evaporators connected in parallel circuit relation; a common exhaust conduit connected to outlets of said evaporators; means for withdrawing gaseous refrigerant from the exhaust conduit, liquefying the refrigerant and returning the liquid 'to the evaporators; means responsive to the pressure of one of the evaporators for fully opening and positively closing its outlet to the exhaust conduit; and a check valve disposed between the outlet of the other evaporator and the exhaust conduit to prevent fiow from thelexhaust conduit to said other evaporator.

4. Refrigerating apparatus comprising, in comtor and the exhaust conduit to prevent fiow from the exhaust conduit to said other evaporator; and means responsive to pressure of the exhaust conduit for starting and stopping the liquefying means. I CHARLES r. CORRECTION.

December 25, 19 b,.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correotionas follows: Page 2, first column, line 37,. for "which SSO 'Y read whichwith S0 and that the said Letters Patent should be read with this correction therein that the same may conform to the record of .the case in the Patent Office.

' Signed and sealedthis 25th day of July, A. n. 19 9.

(Seal) 7' Henry Van Arsdale, Acting Commissioner of Patents.

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