US3656314A - Control apparatus for a two temperature refrigerator - Google Patents

Control apparatus for a two temperature refrigerator Download PDF

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Publication number
US3656314A
US3656314A US53964A US3656314DA US3656314A US 3656314 A US3656314 A US 3656314A US 53964 A US53964 A US 53964A US 3656314D A US3656314D A US 3656314DA US 3656314 A US3656314 A US 3656314A
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Prior art keywords
air
compartment
flow
temperature
refrigerator
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Expired - Lifetime
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US53964A
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English (en)
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Robert C Jung
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Westinghouse Electric Corp
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Westinghouse Electric Corp
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
    • F25D17/062—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation in household refrigerators
    • F25D17/065—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation in household refrigerators with compartments at different temperatures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/042—Air treating means within refrigerated spaces
    • F25D17/045—Air flow control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
    • F25D2317/06—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation
    • F25D2317/061—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation through special compartments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
    • F25D2317/06—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation
    • F25D2317/065—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by the air return
    • F25D2317/0653—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by the air return through the mullion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/04—Refrigerators with a horizontal mullion

Definitions

  • a refrigerator which is provided with two separate compartments, one being a freezing compartment and the other being a fresh food compartment and with a single thermostat and damper arrangement to provide two temperature control within the refrigerator enclosure.
  • the air distribution system includes a conduit disposed in the divider between the freezing compartment and the fresh food compartment and in which the evaporator is situated. Air inlets at the front of the refrigerator provide for the entrance of air from the fresh food and freezer compartment to this evaporator. At the rear of the refrigerator, a fan is disposed for providing for forced circulation of the air flow through the evaporator.
  • a large portion of the air coming off the evaporator is directed through a conduit arrangement back to the freezer compartment to furnish cooling for it, with this compartment receiving approximately 90 percent of the air through the evaporator.
  • Joined to the conduit providing cold air to the freezer is a conduit which leads down through the rearward portion of the refrigerator and discharges an air flow around a meat keeper or vegetable crisper contained in the fresh food compartment.
  • a second conduit is also joined to the conduit supplying cooled air to the freezer, with this conduit being provided with a damper arrangement to adjustably maintain the air flow therethrough to the fresh food compartment.
  • a thermostat is disposed adjacent the juncture of the last two mentioned conduits, with this thermostat controlling the operation of the evaporator so as to maintain a substantially uniform cooling temperature in the freezer. The temperature in the fresh food compartment, of course, may be adjustably maintained based on the setting of the aforementioned damper.
  • a thermostat is provided at the discharge area of the air directly discharged to the fresh food space, with this thermostat controlling the operation of an evaporator and thereby providing a temperature maintenance of the air discharged over it. Since this air flow volume varies rather significantly the thermostats response also varies because of the differing heat transfer coefficients of it with differing air velocities.
  • U.S. Pat. No. 3,126,717 illustrates another air distribution system for a two temperature refrigerator.
  • the frozen food space is disposed directly above the fresh food space with the evaporator positioned beneath it.
  • a main supply conduit provides for a flow of air which is distributed first to the frozen food space through a discharge in this area and secondly to the fresh food space through a discharge arrangement which may be modulated by a damper so as to modify the amount of air flowing to the fresh food space.
  • Control of the evaporator for the refrigerator disclosed in this patent is obtained by the use of a thermostat which is mounted within the fresh food space and thereby subject to the precise temperature in this space as modified by the direct flow of air into the space so that frozen food space temperature is extremely variable.
  • the actual reading thermostat does not closely reflect the temperature of the frozen food space closely enough to maintain its temperature at a substantially uniform rate throughout the operational modes of the refrigerator.
  • U.S. Pat. No. 3,403,533 the air flow across the sensing thermostat is substantially modified, dependent upon the desired temperature within the fresh food space and thereby the setting on the damper.
  • the changing heat transfer characteristics of the changeable volume (velocity) of the air across the thermostat in this refrigerator provides what can be considered at certain operational times a false or at least an inaccurate reading when its signal is passed back to the evaporator to control its operation system.
  • the invention comprises a two temperature refrigerator with the freezing compartment of the refrigerator disposed above the fresh food compartment and separated therefrom by an insulating panel or the like.
  • the evaporator for the refrigerator is disposed at the bottom portion of the freezer compartment in a conduit formed in the insulating panel, with entrance openings provided to this evaporator from both the below freezing compartment and the fresh food compartment.
  • the conduit separates into two air passageways, with a fan providing for circulation of air in the refrigerator positioned substantially at the location of the entrance to these two air passageways.
  • One of these air passageways has a fixed crosssectional area and leads upwardly to discharge air into the freezer compartment.
  • the other air passageway leads sidewardly to provide a junction for two air ducts that lead downwardly so as to provide a forced air circulation into the fresh food compartment.
  • One of these two ducts comprises a passageway which leads air to the lower portion of the fresh food space and discharges it around the meat keeper or vegetable crisper contained in the fresh food compartment to maintain this meat keeper or vegetable crisper at a slightly lower temperature condition than the remainder of the fresh food compartment.
  • the second air passageway also leads into the fresh food compartment, but it is provided with a damper arrangement so that the amount of air passing into the fresh food compartment through this passageway may be controlled to maintain the overall temperature of the fresh food compartment adjustable so that a proper temperature may be selected which is desired or required for the proper refrigeration of the food contained in this compartment.
  • a thermostat element is disposed substantially at the junction of the branching of these two air passageways for the fresh food compartment and rearwardly of the fan so that the fan discharge provides a flow of air across it. Because of the arrangement of the thermostat and its disposition relative to the air passageways for the freezer and fresh food compartments, a substantially constant temperature can be maintained in the freezer compartment which is independent of the temperature in the fresh food compartment to thereby maintain frozen food products at precisely their desired temperature.
  • FIG. 1 is a sectional side view in elevation of the refrigerator somewhat schematically illustrating the principles of this invention
  • FIG. 2 is a sectional view taken on line II-II of FIG. 1 with the meat keeper removed and showing the arrangement of the ducting and damper mechanism of the instant invention
  • FIG. 3 is a detailed enlarged view of the damper arrangement and the air passageways adjacent to it as seen in FIG. 2;
  • FIG. 4 is a fragmentary view taken on line IV-IV of FIG. 3 and showing the damper shutter of the fresh food space discharge passageway.
  • FIGS. 1 and 2 it can be seen that a refrigerator is shown having a freezer food space 12 and a fresh food space 14. These two spaces are bounded by a top wall 16, back wall 18, sidewalls and 22 and a bottom wall 24 so that the walls just related generally outline the I space which undergoes refrigeration.
  • a dividing wall 26 is disposed approximately two-thirds of the way vertically upwardly from the bottom wall 24 to provide a separation for dividingthe refrigerator into the frozen food and fresh food spaces 12, 14, respectively.
  • the refrigeration enclosure is completed by upper and lower doors 28 and 30 that close the forward portion of the freezer and fresh food spaces, respectively.
  • An evaporator 32 is disposed in a conduit 34 formed in dividing wall 26 and extends therealong substantially from front to back. Intake air to the evaporator 32 flows into the conduit 34 from the freezer space 12 by means of an opening 36 and from the fresh food space 14 by means of an opening 38, with both of these openings communicating with conduit 34 forwardly of the evaporator 32 and with each of these openings being disposed in their respective compartments substantially at the front of the refrigerator 10. These air flows are indicated by the arrows A and B which schematically illustrate the flow of these air streams into the evaporator 32. The air flows from these two openings into the conduit 34 and through the evaporator and its cooling coils (not shown) and is discharged from the rear of the evaporator into the rearward extent of the conduit 34 as indicated by the arrow C.
  • Conduit 34 terminates at a junction 40 where it branches into an air passageway 42.
  • Passageway 42 leads upwardly into and discharges directly into the freezer food space 12 at an exit 48 as indicated by the arrow D.
  • This passageway is formed by the front face of the rear wall 18 and a wall 50 tapering upwardly and rearwardly to provide a tapered cross-section to the passageway 42 towards the opening 48.
  • a streamlined flow of air is assured in the passageway 42 to encourage freedom of flow into the freezer compartment 12 by a larger amount of cooling air.
  • a fan 52 Disposed slightly rearwardly of the junction 40, a fan 52 is provided so as to insure that a forced flow of air is supplied to both the freezer and fresh food spaces 12 and 14.
  • This fan discharges into the passageway 42 and a pair of passageways 44 (arrow E) and 46 (arrow F) disposed downstream through a connecting passageway 45 (arrow C) which leads from the junction 40.
  • the passageway 44 opens downstream of the fan 52 into a passageway 45 and sidewardly of junction area 40.
  • This passageway extends therefrom vertically downwardly in the back wall 18 being formed therein, and terminates adjacent to the bottom of the fresh food space 14 by means of a discharge 54, with this discharge located behind a meat keeper or vegetable crisper 56.
  • the meat keeper 56 is disposed on runners (not shown) or some other equivalent supporting means (not shown) which maintain it slightly spaced above the bottom wall 24 of the refrigerator 10.
  • Meat keeper 56 includes a cover 58 to prevent any circulation of air within the fresh food space 14 from tending to dry out the food items maintained in the meat keeper 56.
  • meat keeper 56 is also spaced slightly forwardly of rear wall 18 so that a variable cross-section passageway 60 is provided between the rear wall 18 and it and between the bottom wall 24 and it to lead the flow of air from the discharge 54 downwardly around (arrow G) and then forwardly around (arrow H) the meat keeper 56.
  • the temperature of the meat keeper is maintained at a slightly lower temperature than the remainder of the fresh food space 14, since the volume of air directed around it is not subject to heating by the remainder of the volume of food disposed in and the sidewalls, etc., of the fresh food space 14.
  • the third passageway 46 extends from the passageway 45 slightly forwardly of the passageway 44 to also provide a flow of cooling air to the fresh food space 14 as is indicated by the arrow F. This air is discharged outwardly into the fresh food space 14 through an opening 62 formed slightly below the bottom surface of the dividing wall 26 of the refrigerator 10.
  • the volume of air flow through the passageway 46 has means so that its flow may be varied by the operator, depending entirely upon that temperature at which he desires the fresh food space 14 to be maintained.
  • Damper 64 takes the form of a shutter 64 can be seen to be disposed in the air passageway 46 so as to adjustably moderate the amount of air flowing through this passageway.
  • Damper 64 includes a manipulating knob 66 mating with a shutter extension which the operator of the refrigerator may grasp to move the said damper sidewardly for opening and closing the air passageway 46.
  • This damper is disposed on the bottom surface of the dividing wall 26 with the manipulating knob 66 disposed on the front face of the damper housing so as to facilitate its handling by the housewife or the like. As shown in FIG.
  • the shutter 64 comprises a thin, shutter-like element which reciprocates sidewardly thereby closing off a greater or lesser portion of the flow area of air passageway 46.
  • the full line position of the shutter 64 is the position where the largest amount of the flow area of passageway 46 is shut off and the dashed line position of the shutter 64 is that position where the largest amount of flow area of passageway 46 is opened for air flow. Because of the large amount of area which can be proportionately closed off for the passage of air flow through passageway 46, a large range of adjustments of temperature within the fresh food space 14 is afforded to the user by mere manipulation of the knob 66. It should be noted that, no matter what the position of the shutter 64, a certain portion of air is still capable of flowing through the passageway 46 to provide supplementary cooling for the fresh food space 14 over that afforded by the flow of cooling air to the meat keeper 56.
  • Thermostat 68 includes the usual and conventional housing 70 and a sensing element 72 which extends upwardly into the conduit 45.
  • the sensing element 72 terminates with a coil 74, with the actual temperature reading done by this coil element. It is located in the conduit 45 proximate a junction 47 of this conduit with the passageway 46 and directly aligned with the air flow through an opening 49 (FIG. 2) that serves as the inlet for the passageway 44.
  • an opening 49 FIG. 2
  • said conduit means including branches, said branches leading to and being in communication with said above freezing food compartment and each providing a separate cooling air discharge to it,
  • temperature sensing means disposed in said conduit means for controlling said air cooling means, said temperature sensing means being disposed upstream of said damper means.
  • conduit means for circulating cooled air to said compartments
  • conduit means including branches
  • temperature sensing means disposed in said conduit means for controlling said air cooling means, said temperature sensing means being disposed upstream of said damper means,
  • one of said branches is provided for cooling a food retaining drawer means contained in a first one of said food compartments, by providing a discharge of cooling air thereto, and
  • a second of said branches is provided for discharging air directly into said first one of said food compartments.
  • said damper is positioned in said second of said branches.
  • said temperature sensing means is disposed in said conduit means so as to have impinged directly thereon the main flow of said one of said branches.
  • conduit means including branches
  • one of said branches provided for cooling a food retaining drawer means contained in a first one of said food compartments
  • conduit means i. a third branch of said conduit means provides a flow of cooling air to a second one of said food compartments
  • said third branch is disposed upstream from said damper means.
  • said one of said branches has a flow that varies between approximately 30 to 40 percent of the total flow of said one branch and said second branch and said second of said branches has a flow that varies between approximately 60 to 70 percent of the total flow of said one branch and said second branch.
  • the flow of cooling air to the second one of said compartments is approximately percent of the total flow to the first and second compartments when said damper means is at its full open position.
  • said temperature sensing means is disposed directly in the flow path of cooling air for said one of said branches, and
  • said temperature sensing means is disposed offset from the direct, main flow of cooling air to said second branch.
  • forced air circulating means for moving air to be cooled across said evaporator
  • conduit means for providing air fiow to said first and second air passageways
  • damper means for closing off a portion of said first air passageway means
  • said temperature sensing means being upstream of said damper and disposed directly in the air flow to the second air passageway means and having a portion of the air flow to said first passageway means impinging thereon,
  • a method of providing a uniform temperature in one compartment of a two temperature refrigerator while varying the other including;
  • said relatively large portion of cooled air represents approximately percent of total flow.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
US53964A 1970-07-10 1970-07-10 Control apparatus for a two temperature refrigerator Expired - Lifetime US3656314A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3866437A (en) * 1973-09-10 1975-02-18 Westinghouse Electric Corp Adjustable damper control mechanism
US4229945A (en) * 1978-12-08 1980-10-28 General Electric Company Household refrigerator air flow control and method
US4241589A (en) * 1979-08-30 1980-12-30 General Electric Company Household refrigerator air flow control assembly
US4288995A (en) * 1979-11-26 1981-09-15 General Electric Company Household refrigerator movable storage assembly
US4614092A (en) * 1982-07-12 1986-09-30 Gold Star Company, Ltd. Refrigerator with a closeable refrigerating compartment
EP0535519A1 (en) * 1991-09-30 1993-04-07 Whirlpool Europe B.V. Refrigerator with a convertible compartment
US5901562A (en) * 1997-06-04 1999-05-11 Maytag Corporation Temperature control system for a multi compartment refrigerator
EP1174666A3 (en) * 2000-07-21 2004-01-21 Fujitsu General Limited Electric refrigerator
US6694754B1 (en) * 2002-03-22 2004-02-24 Whirlpool Corporation Refrigeration appliance with pulsed defrost heater
WO2004029527A2 (en) 2002-09-30 2004-04-08 Arçelik A.S. Temperature control mechanism
DE102015007359A1 (de) * 2014-10-29 2016-05-04 Liebherr-Hausgeräte Ochsenhausen GmbH Kühl- und/oder Gefriergerät

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2907180A (en) * 1956-10-19 1959-10-06 Gen Motors Corp Refrigerating apparatus having air control means for multiple compartments
US3050961A (en) * 1961-05-09 1962-08-28 Gen Motors Corp Single evaporator two-compartment refrigerator
US3093981A (en) * 1961-07-24 1963-06-18 Whirlpool Co Gas flow controller means for a refrigerator
US3104533A (en) * 1961-04-24 1963-09-24 Gen Motors Corp Refrigerating apparatus
US3105364A (en) * 1961-04-24 1963-10-01 Gen Motors Corp Refrigerating apparatus with defrost means
US3110158A (en) * 1961-05-29 1963-11-12 Gen Motors Corp Refrigerating apparatus including defrost means
US3203195A (en) * 1963-05-27 1965-08-31 Gen Motors Corp Refrigerating apparatus
US3359750A (en) * 1965-12-02 1967-12-26 Gen Motors Corp Refrigerator with defrost when necessary system
US3455119A (en) * 1968-02-16 1969-07-15 Gen Motors Corp Plural compartment high humidity domestic refrigerator

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2907180A (en) * 1956-10-19 1959-10-06 Gen Motors Corp Refrigerating apparatus having air control means for multiple compartments
US3104533A (en) * 1961-04-24 1963-09-24 Gen Motors Corp Refrigerating apparatus
US3105364A (en) * 1961-04-24 1963-10-01 Gen Motors Corp Refrigerating apparatus with defrost means
US3050961A (en) * 1961-05-09 1962-08-28 Gen Motors Corp Single evaporator two-compartment refrigerator
US3110158A (en) * 1961-05-29 1963-11-12 Gen Motors Corp Refrigerating apparatus including defrost means
US3093981A (en) * 1961-07-24 1963-06-18 Whirlpool Co Gas flow controller means for a refrigerator
US3203195A (en) * 1963-05-27 1965-08-31 Gen Motors Corp Refrigerating apparatus
US3359750A (en) * 1965-12-02 1967-12-26 Gen Motors Corp Refrigerator with defrost when necessary system
US3455119A (en) * 1968-02-16 1969-07-15 Gen Motors Corp Plural compartment high humidity domestic refrigerator

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3866437A (en) * 1973-09-10 1975-02-18 Westinghouse Electric Corp Adjustable damper control mechanism
US4229945A (en) * 1978-12-08 1980-10-28 General Electric Company Household refrigerator air flow control and method
US4241589A (en) * 1979-08-30 1980-12-30 General Electric Company Household refrigerator air flow control assembly
US4288995A (en) * 1979-11-26 1981-09-15 General Electric Company Household refrigerator movable storage assembly
US4614092A (en) * 1982-07-12 1986-09-30 Gold Star Company, Ltd. Refrigerator with a closeable refrigerating compartment
EP0535519A1 (en) * 1991-09-30 1993-04-07 Whirlpool Europe B.V. Refrigerator with a convertible compartment
US5901562A (en) * 1997-06-04 1999-05-11 Maytag Corporation Temperature control system for a multi compartment refrigerator
EP1174666A3 (en) * 2000-07-21 2004-01-21 Fujitsu General Limited Electric refrigerator
US6694754B1 (en) * 2002-03-22 2004-02-24 Whirlpool Corporation Refrigeration appliance with pulsed defrost heater
WO2004029527A2 (en) 2002-09-30 2004-04-08 Arçelik A.S. Temperature control mechanism
DE102015007359A1 (de) * 2014-10-29 2016-05-04 Liebherr-Hausgeräte Ochsenhausen GmbH Kühl- und/oder Gefriergerät

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ES393096A1 (es) 1974-11-16
CA922913A (en) 1973-03-20

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