Патент USA US2133962код для вставки
Oct. 25,‘ 1938. M. G. SHOEMAKER 2,133,962 REFRIGERATYING APPARATUS Filed Oct. 30, 1956 22' . Fig.2, WI TN ESSES: INVENTOR 'MnLccLM G. S‘HOEMRKER ' BY ATTORNEY Patented Oct. 25, 1938 . , 2,133,962 UNITED STATES PATENT‘OFFAICE ~ nnrmonna'mvc APPARATUS Malcolm G. Shoemaker, Spring?eld, Mass, as . signor to Westinghouse Electric & Manufac turing Company,-East Pittsburgh, 2a., a cor poration of Pennsylvania - . Application October 30, 1936, Serial No. 108,361 7 Claims. (CL 62-415) My invention relates to refrigerating appa- 28. The valve plate 25 closes the ports '25 and 'ratus having a plurality of evaporator elements and ‘has for an object to provide improved appa ratus of this kind. 5 A further object of the invention is to provide an improved multi-evaporator refrigerating sys tem having a high side ?oat valve mechanism commonto the evaporators with means for se lecting the evaporator to receiverefrigerant from 10 the valve mechanism. 7 ' , These and other objects are effected by my in-_ vention as will be apparent from the.‘ following description and claims taken in connection with the accompanying drawing, forming a part of this 15 application in which: . . Fig. 1 is a diagrammatic view of a refrigerating system constructed in accordance with my in 21, successively, as the level of the refrigerant _ . in the vcasing 25 falls.. The position of the ?oat 22 and valve plate 29 _ shown in the drawing, indicates that the solenoid .16 valve 24 is closed so that liquid cannot pass through the port 21. Accordingly, the ?oat 52 controls'the ?ow of refrigerant passing through the port 28 in response to the level of refrigerant , in the casing 25. when the solenoid valve 24 is 10 opened, refrigerant passesimmediately through theport 21 and conduit 22 to the evaporator i5. As the level of refrigerant in the casing ‘25 drops, the valve plate 29 closes the port 25 and controls ‘ the ?ow of refrigerant through the port 2'! in re‘- 15 spouse to the level of refrigerant in’the casing 25. The operation of the evaporator: 12 and l5 ‘ ' is selectively controlled by the solenoid valve“. vention; and Fig. 2 is an enlarged sectional view of the ?oat when solenoid 25 is energized, the valve 24 is ' open and flow of condensed refrigerant to the 20. 20 valve employed in the system shown in Fig. l. ’ Referring now to the drawing, the numerals i0 evaporator I2 is e?ected under control of the ?oat 32. At this time, the valve plate ,28-closes and II indicate relatively high and low tempera the port 28 so that the conduit 22 and evaporator - ture chambers which are. refrigerated by evapo l2 receive no condensed refrigerant. rators l2 and i3, respectively. Refrigerant va Operation of the evaporator I2 ‘is effected by 25 2'5 porized in the evaporators i2 and I3 is withdrawn therefrom by a compressor l4 through a conduit l5 common vto both evaporators. The compres sor I4 is driven, preferably, by a motor l5 and operates to ‘compress the vapor withdrawn from 30.12116 evaporators l2 and I3 to a relatively high ' pressure in a condenser H. The condenser I1 is cooled in‘ any suitable manner, such as, for 7 example,‘ by a fan l8, ‘whereby the high pressure vapor is condensed. A reservoir l9 maybe pro 35 vided for collecting refrigerant lique?ed in the‘ condenser H. Y Condensed refrigerant is conveyed through a conduit 20 from the reservoir 19 to a ?oat valve [ structure, shown generally at 2!, and connected 40 to the evaporators l2 and i3 by conduits 22 and '23. A valve 24 actuated by a solenoid 25 is dis posed in the conduit 22 for controlling the ?ow of refrigerant therethrough. The construction deenergizing the solenoid 25, whereby the valve 24‘ closes. Flow of refrigerant through the port'2'l and conduit 22 to the evaporator .I2 is then termi nated. Accordingly, the level of refrigerant in the ?oat valve' structure 2| rises 'as the com- 30 pressor I4‘ is operated and refrigerant is supplied ‘ to the evaporator vl3 through the port .25. and conduit 23 in response to the level of refrigerant -in the casing 25. - Automatic control of the operation of the evap- 35 orators l2 and i2 may be e?ected by thermostats 35 and 36 that respond'to temperatures within the respective chambers HIV and II and which control the energization of the motor l6 and solenoid 25. The source of electric power for 40 the motor l6 and solenoid 25 is represented by 7 line conductors Li and In. . _ when closed, the thermostat 25 energizes the and operation of solenoid operated valves is well motor l5 for operating the compressor I4 where 45 known in the art and will not be described, other by refrigerant is supplied to the evaporator I3, 45 than to say that the valve 24 is open when the the solenoid valve 24 beingclosed. ' The energiz solenoid 25 is energized and is closed when the ing circuit‘includes the line conductorLi, motor l6, a conductor 51, thermostat 25, and line con solenoid 25 is deenergized. The ?oat valve structure 2| includes a casing ductor’La when the thermostat 35 is closed, 50 26 that receives condensed refrigerant‘from the the motor l5 and solenoid 25 are'energized and 50 ‘ conduit 20. The conduits 22 and 23 terminate in ports 21 and 28 communicating with them terior of the casing 26. A valve plate 29, pivoted at 3|, is actuated by a ?oat 32 that rises and falls ' withthe level of liquid refrigerant ‘in the casing the compressor operates to circulate refrigerant throughr the evaporator i2. I have shown the solenoid-25 arranged in series with the motor i5 when the latter is energized by the thermostat 55, but it will be understood that it may be con- 55 2 2,188,902 nected otherwise for energization at this time. The energizing circuit for the motor I6 .and solenoid 25 includes the line conductor Laimotor I6, a conductor 33 having the solenoid 25 con nected therein, 'the thermostat 35, a conductor 33, and the line conductor La. The electric connections disclosed give pref erence to the thermostat 36 when both thermo stats 35 and 36 are closed, as the-thermostat 36 10 forms a shunt across the circuit including the the low temperature evaporator I3, the, higher I temperature evaporator is substantially devoid‘, of liquid refrigerant and when evaporation is effected in the high temperature evaporator l2, the low temperature evaporator is substantially ?lled with liquid refrigerant. It will be apparent that there is a larger amount of liquid refrigerant in the high side of the system when vaporization is effected in the low temperature evaporator I3 than when vaporization is effected in the high 10 conductor 38, solenoid 25, thermostat 35 and temperature evaporator I2. The added amount conductor 39. Accordingly, the solenoid 25 is of refrigerant in the high side during refrigera-_ deenergized under this condition and refrigerant tion of the low temperature evaporator I3 col is, therefore, passed to the low temperature ' lects in the ?oat valve casing 26 and effects rais evaporator I3 associated with the thermostat 36. ing of the ?oat 32 su?lciently to open the port 15 It will be understood that the thermostat 35 and its associated higher temperature evaporator I2 may be given preference, if desired. 20 Operation . As shown in Fig. 1, the temperatures of the‘ air in the chambers I 0 and It are below values at which their respective thermostats close and, therefore, the motor I6 and compressor I4 are inactive. Assume a rise in temperature in the chamber III to the value at which the thermostat 35 closes. The motor I6 and solenoid 25 are energized by the aforementioned circuit so that ' 28. The volume of the casing 26 and the re frigerant charge may be so proportioned that the level of refrigerant in the casing 26 is at proper elevations for the different amounts of refrigerant present in the high side of the system. 20 When both chambers I0 and II require cooling, their respective thermostats 35 and 36 are closed. The low temperature chamber II is given pref erence as the thermostat 36 shunts the thermo- . stats 35 and solenoid 25, as described heretofore. 2.5 Accordingly, the solenoid 25 is deenergized and the valve 24 is closed, whereby condensed refrig erant is supplied to the ' evaporator I3 only. operation of the compressor I4 and opening of When the temperature of the air in chamber II the valve 24 are effected. is depressed to the desired value, the thermostat Condensed refrigerant in the casing 26 of the 36 opens the shunt across the solenoid 25, which 30 valve structure 2I is passed through the port is energized and transfers the ?ow of refrigerant‘ 21 and conduit 22 to the evaporator I2 under from the evaporator I3 to the evaporator I2, The control of the ?oat 32. As the valve plate 23 compressor I4 continues to operate as the motor 35 covers the port 28, no condensed refrigerant. ' [I6 is energized by the closed thermostat 35. 35 is passed to the evaporator I3. Operation of the compressor I4 continues‘ until the temperature of the air in the chamber I0 is depressed to the ‘value at which the thermostat 35 opens whereby ,40 the compressor I4 is stopped and the solenoid 25 is deenergired. During periods when vaporiza tion is effected in the evaporator I2, the evapo rator I3 is ?lled, substantially, with refrigerant but vaporization is not effected therein-as its temperature is lower than the temperature of vaporization in the higher temperaturev evapo rator I2. Vapor from the evaporator I2 is pre vented from condensing in the low temperature evaporator I3 as the latter is substantially ?lled 50 ,with liquid refrigerant. Assume a .rise in temperature within the low From the foregoing, it will be apparent that I have provided an improved two temperature refrigerating system having a novel ?oat valve structure for controlling the ?ow of refrigerant to the high and low temperature evaporators 40 with means for selecting the evaporator to re ceive refrigerant. ' It will be understood that other forms of re frigerant condensing units niay be' employed without departing from‘ the ‘spirit of the inven tion. The various control instrumentalities are shown byway of example and in their simplest form for the sake of clearness andi it will be understood that other forms or types. of control devices may be employed. The speci?c construc 50 tion of the ?oat valve mechanism disclosed may . be considered as the preferred form but it is temperature chamber II to the value at which the thermostat 36 closes the aforementioned cir - apparent that other forms may be adopted. cuit for energizing the motor I6. Operationof While I have shown my invention in but one the compressor I4 is initiated and withdraws ' vaporous refrigerant which is present in the evaporators l2 and I3. As the solenoid 25 is de energized and the valve 24 closed, no condensed refrigerant is- passed to the evaporator I2. Con densed refrigerant delivered to ‘the casing 28 raises the ?oat 32 sufficiently to open the port 23 so that refrigerant is delivered to the evaporator I 3 through theconduit 23 under control of the ?oat 32. As the evaporator I2 operates at a higher temperature than the evaporator I3, va porization of the refrigerant therein is effected form, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various changes and modi?cations without de parting from the spirit thereof, and I desire, therefore, that only such limitations shall be placed thereupon as are imposed by the prior art 60 or as are speci?cally set forth in the appended claims.-- - 'What I claim is: ‘ ' 1. In refrigerating apparatus, the combina tion of ?rst and second evaporators, means for ' 65 supplying condensed refrigerant to the evapora tors, a valve structure for controlling the sup orator I3.» When all refrigerant is vaporized in ply of condensed refrigerant to the. evaporators the evaporator I2, evaporation is effected at rela and including ?rst and second discharge ports 70 tively low pressure in the evaporator I3 and con for respectively passing refrigerant‘to the ?rst 70 tinues until the-temperature within thev cham and second evaporators, means responsive to the' ber II is depressed to a predetermined value at level of the liquid in the valve structure for suc which the thermostat 36 operates to deenergize cessively opening the ?rst and second ports as the motor l6; ' the‘ level vof refrigerant in the structure rises, prior to vaporization of refrigerant in the evap Accordingly, when evaporation is ellected in and means for controlling the passage of re 3 2,133,962 frigerant through said- ?rst port, said control 4. In refrigerating apparatus, the combination of ?rst and second evaporators, means for 'con ling means being operative to terminate passage of refrigerant through the ?rst port, whereby the level responsive means operates to control the discharge of refrigerant through the second densing refrigerant vaporized in the evaporators, of ?rst and second evaporators, means for con a ?oat valve, structure for receiving the refrig-> erant condensed by said condensing means, said ?oat structure having ?rst and second outlets for passing refrigerant to the ?rstand second evap orators, respectively, and means for selecting the densing refrigerant vaporized in the evaporators, outlet of the ?oatv structure which is effective to ‘ ' port to the second evaporator. , 2. In refrigerating apparatus,-the combination pass refrigerant. _ a container for receiving the condensed refrig 5. In refrigerating apparatus; the combination erant and having ?rst and second outlets con nected to the ?rst and second evaporators, ‘re of ?rst and second evaporators, means for .con spectively, a valve cooperating with the outlets densing refrigerant vaporized in the evaporators, and movable in response to the level of liquid _a float valve structure for receiving the refrig erant condensed by said means, said ?oat struc- 1, 15 in the container, said valve opening the ?rst and second outlets successively as the level in ,ture having ?rst and second outlets for passing the container rises, and means for controlling refrigerant to the ?rst andisecond evaporators, the passage of refrigerant through the ?rst out respectively, and means responsive to tempera tures produced by the respective evaporators let and movable to a position wherein the pas 20 sage of refrigerant throughthe ?rst outlet is for selecting the outlet which is effective to passv “ ‘ prevented, whereby the valve cooperates with refrigerant. the second outlet to supply refrigerant to the 6. In refrigerating apparatus, the combination of ?rst and second evaporators, a compressor for second evaporator. ‘ 3. In refrigerating apparatus, the combina _ \ circulating refrigerant through the evaporators,‘ 25 tion of ?rst and second evaporators, means for and means including ?rst and second passages '1. connected to the respective evaporators for con trolling the ?ow of refrigerant through the evap orators, said means being responsive to a con dition of the refrigerant for selectively effecting condensing refrigerant vaporized in the evapora tors, a container for receiving the condensed re frigerant and having ?rst- and second outlets connected to the ?rst and second evaporators, 80 respectively, a ?oat positioned in response to .the level of liquid in the container, a movable valve ?ow'of refrigerant in the evaporators.‘ 2 7. In refrigerating apparatus, the combination member associated with the outlets and actuated by the ?oat in such manner that the ?ow of re-. of ?rst and second evaporators, a refrigerant’ condensing unit for circulating refrigerant through the evaporators, and means including ?rst and second refrigerant passages respectively 35 means for controlling the passage of refrigerant connected to the first, and second evaporators through the ?rst port and adjustable for pre for selectively controlling the ?ow of refriger venting the passage of refrigerant therethrough, - ant to they evaporators, said means being actu whereby the level of liquid in the container rises ated in response to variable levels of refrigerant , condensed by said condensing unit. 40 and the valve member cooperates with the sec 40 ond port for controlling the‘ ?ow of refrigerant frigerant through the ?rst port is controlled thereby while the second. port is closed, and therethrough. - . MALCOLM G.. SEOEMAKER.