US3511060A - Defrosting device for a refrigerating machine - Google Patents

Defrosting device for a refrigerating machine Download PDF

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Publication number
US3511060A
US3511060A US741531A US3511060DA US3511060A US 3511060 A US3511060 A US 3511060A US 741531 A US741531 A US 741531A US 3511060D A US3511060D A US 3511060DA US 3511060 A US3511060 A US 3511060A
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Prior art keywords
defrosting
evaporator
refrigerant fluid
reservoir
liquid
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US741531A
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English (en)
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Herman Fredrik Wilhelm Bodcher
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    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F25B47/022—Defrosting cycles hot gas defrosting

Definitions

  • a device for defrosting the evaporator of a compression refrigerating machine comprising a defrosting reservoir with its upper part containing constantly gaseous refrigerant fluid and connected, on the one hand, to the upper part of the evaporator by a defrosting pipe provided with a defrosting valve open only during the defrosting period, during which the compressor is stopped, and, on
  • the present invention relates to a defrosting device for the evaporator of a compression refrigerating machine comprising, inter alia, a compressor, a condenser, an expansion device and an evaporator.
  • the defrosting device In known refrigerating machines, the defrosting device consists of electric resistances independent of the refrigerating machine and producing a determined quantity of heat transmitted to this machine to defrost the surfaces of its evaporator.
  • This electrical defrosting device has, on the one hand, the disadvantage of heating the interior and useful volume of the refrigerating machine and, on the other hand, of producing deposits of particles of carbonized oil occasioning stops in the functioning and breakdowns of the machine.
  • the present invention has as an object, a new drefrosting device which obviates the aforementioned disadvantages of the known devices, while being more eflicient and less expensive than these latter.
  • the new defrosting device comprises a defrosting reservoir.
  • the upper part of this defrosting reservoir constantly contains refrigerant fluid in gaseous phase and is connected, on the one hand, to the upper part of the evaporator by a defrosting pipe provided with a defrosting valve open only during the defrosting period, during which the compressor is stopped, and, on the other hand, constantly to the upper part of the condenser.
  • the remaining part of the defrosting reservoir constantly contains refrigerant fluid in liquid phase and is connected, on the one hand, to the lower part of the evaporator by a refrigerant liquid delivery-pipe, provided with an expansion device and by a return-pipe for this liquid, provided with a check-valve, and, on the other hand, constantly to the lower part of the condenser.
  • the new defrosting device comprises a detection apparatus for frost or ice formed on the surfaces of the evaporator during the normal running of the refrigerating machine, this detection apparatus regulating the defrosting valve mentioned above.
  • This characteristic allows automatic regulation of the defrosting and, in particular, the stopping of the compressor at the beginning of the defrosting period and the re-starting thereof at the end of this period.
  • the new defrosting device comprises a means for evaporating during defrosting at least a part of the refrigerant liquid situated in the lower part of the defrosting reservoir, which only functions during defrosting.
  • This characteristic allows any mutual arrangement of the condenser, the evaporator and the defrosting reservoir in the refrigerating machine.
  • FIG. 1 is a diagram illustrating a first embodiment of a refrigerating machine with a defrosting device according to the invention, this machine running normally.
  • FIG. 2 is an analogous diagram illustrating the same machine during the defrosting period.
  • FIGS. 3 and 4 are further diagrams illustrating two further embodiments of a refrigerating machine with a defrosting device according to the invention.
  • the same reference numbers indicate identical components, while the thick unbroken lines, the dotted lines over fine unbroken lines and the thin unbroken lines indicate respectively the pipes for the refrigerant fluid in liquid phase, those for the refrigerant fluid in saturated gaseous phase and those for the refrigerant fluid in gaseous phase of the superheated vapour, the dotted lines indiacting, in addition, electrical conductors.
  • the refrigerating machine comprises essentially a compressor 1, a condenser 2, a defrosting reservoir 3, an expansion device 4 and an evaporator 5.
  • the defrosting reservoir 3 presents two chambers 6 and 7 which are adjacent. In the first embodiment, these chambers 6 and 7 are superposed while in the second and third embodiments the said chambers 6 and 7 are horizontally adjacent.
  • the chambers 6 and 7 of the defrosting reservoir 3 are separated from one another by a dividing plate 8 but they intercommunicate by a vertical tube 9 in the first chosen example or by an opening 9 in this plate in the two latter cases.
  • the defrosting reservoir 3 contains, on the one hand, refrigerant fluid in liquid phase in the lower parts of its chambers 6 and 7, and, on the other hand, refrigerant fluid in gaseous phase in the upper parts of the said chambers.
  • refrigerant fluid in gaseous phase is sucked up by the compressor 1 from the upper part of the evaporator 5 to that of the condenser 2, through a suction pipe 10 and a delivery pipe 11.
  • the refrigerant fluid is cooled and passes into liquid phase.
  • the refrigerant fluid in liquid phase is admitted to the defrosting reservoir 3 in which it can pass from one chamber to the other through the tube 9 or the opening 9 of the plate 8.
  • refrigerant fluid in liquid phase is carried through a connecting-pipe 14 as far as the expansion device 4 where a pressuredrop is produced.
  • the refrigerant fluid is introduced in the lower part of the evaporator 5 in 3 which it continues its evaporation and then supplies units of cold to the refrigerating machine. Having ensured the desired cooling of this machine, the refrigerant fluid in gaseous phase is sucked up by the compressor 1 to the upper part of the evaporator to recommence the same cycle.
  • a coating of frost or ice After a certain time of normal running, there is formed on the surfaces of the evaporator 5 a coating of frost or ice, the thickness of which is detected by an appropriate detection means such as a pressostat 15, a thermostat or a time-switch. When the thickness of this coating reaches a limited value, the pressostat acts and ensures the necessary defrosting period for the surfaces of the evaporator 5.
  • the pressostat 15 is connected to the electric supplycircuit of the motor component of the compressor 1 by electrical conductors 16.
  • the pressostat 15 is connected electrically to a defrosting valve 17, hitherto closed, by electrical conductors 18.
  • the defrosting valve 17 is connected to a defrosting pipe 19 which extends from the upper part of one of the chambers of the defrosting reservoir 3 to the aforementioned suctionpipe 10.
  • the pressostat 15 having registered a given pressure corresponding to a given coating of ice or frost, brings the compressor 1 to a stop and opens the defrosting valve 17. Thus there is then established a uniform stabilized pressure in the refrigerating machine.
  • the cooling agent of the condenser acts this time as a source of heat for the refrigerant liquid.
  • the refrigerant fluid in liquid phase situated in reserve in the chambers of the defrosting reservoir 3 is gradually vaporized in the condenser 2 which plays the role of an evaporator.
  • This vaporized refrigerant fluid then passes through the defrosting pipe 19 via the valve 17, then open, into the evaporator 5 where it is condensed, transferring its vaporization heat to the coating of ice or frost which melts.
  • the refrigerant fluid thus condensed is led into the lower part of the evaporator 5 and is evacuated by gravity through the return-pipe 20, provided with a checkvalve 21, into the lower part of the chamber 6 of the defrosting reservoir 3 to pass next into the chamber 7 of this reservoir and to be recycled through the condenser 2 and the evaporator 5.
  • the pressostat When the defrosting is finished, the pressostat simultaneously closes the defrosting valve 17 and restarts the compressor 1. The level of refrigerant fluid in liquid phase rises again in the defrosting reservoir 3. In addition, during the resumption of normal running, the high pressure prevailing in the defrosting reservoir 3 is reestablished, which brings about the closing of the checkvalve 21.
  • this means consists of an electrical resistance 22 surrounding a section of the pipe 12. This resistance, fed with current by electrical conductors 23, produces by the JOULE effect the necessary heat for the aforementioned evaporation of the refrigerant fluid in liquid phase.
  • the similar means is a heatexchanger 24 formed by a section of the aforementioned pipe 12 and by another pipe heated by an external agent, specifically with ambient air.
  • the pressostat 15 simultaneously effects the stopping of the compressor 1, the opening of the defrosting valve 17, the supplying of the electrical resistance 22 or the heatexchanger 24.
  • This action has the effect of establishing in the whole circuit of the refrigerating machine, a medium pressure between the high pressure and low-pressure parts put in communication by the defrosting valve 17.
  • the cooling agent of the condenser acts this time as an agent providing heat to the refrigerant fluid in gaseous phase brought into the condenser 2, due to the evaporation of the refrigerant fluid in liquid phase situated in the heated part of the pipe 12.
  • This refrigerant fluid in liquid phase heated by the electrical resistance 22 or the heat-exchanger 24 rises in droplets as far as the condenser 2 where they are gasified, the condenser playing the role of an evaporator.
  • the refrigerant fluid situated in the condenser 2 is thus continually vaporized and passes through the aforementioned pipe 13 into the upper part of the defrosting reservoir 3.
  • This vaporized refrigerant fluid then passes through the defrosting pipe 19 through the defrosting valve 17, then open and reaches the evaporator 5 whereit condenses, which has the effect of defrosting the evaporator 5.
  • the liquid refrigerant fluid thus produced by condensation in the evaporator 5 flows therefrom and passes through the return-pipe 20 into the defrosting reservoir 3 as already stated above.
  • a defrosting device for a compression refrigerating machine making use of a refrigerant fluid and comprising a compressor for compressing the refrigerant fluid in gaseous phase and conveying the fluid in a refrigerating circuit; a condenser receiving the refrigerant fluid in gaseous phase from the compressor and condensing said fluid; a liquid-to-gas defrost reservoir receiving the refrigerating fluid in liquid phase from the condenser and constantly containing refrigerant fluid in liquid and in gaseous phase; an expansion device in said circuit and traversed by refrigerant fluid in liquid phase furnished from the liquid-to-gas reservoir; an evaporator for receiving refrigerant fluid in liquid phase from the expansion device and evaporating said refrigerant fluid which is then again received by the compressor; a defrosting pipe joining the top portion of the gas-to-liquid reservoir to the top portion of the evaporator; a defrosting valve in the defrosting pipe for opening and closing the same; detector means for fr
  • a defrosting device according to claim 1 wherein said liquid-to-gas reservoir comprises means for keeping the refrigerant fluid in liquid phase at a prescribed level while the refrigerating means is running.
  • a defrosting device comprising means for evaporating at least a part of the liquid refrigerant in the bottom of the liquid-to-gas reservoir, during the defrosting of the refrigerating machine.
  • a defrosting device comprising a pipe joining the liquid-to-gas reservoir at the bottom thereof to the bottom of the condenser, said means for evaporating at least a part of the liquid refrigerant in the bottom of the liquid-to-gas reservoir comprising an electrical resistance for heating the pipe which joins the bottom of the liquid-to-gas reservoir to the bottom of the condenser.
  • a defrosting device comprising a pipe joining the liquid-to-gas reservoir at the bottom thereof to the bottom of the condenser, said means for evaporating at least a part of the liquid refrigerant in the bottom of the liquid-to-g-as reservoir comprising a pipe fed by a heating agent and in heat exchange relation with the pipe connecting the bottom of the liquid-to-gas reservoir to that of the condenser.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Defrosting Systems (AREA)
US741531A 1967-07-07 1968-07-01 Defrosting device for a refrigerating machine Expired - Lifetime US3511060A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE701075 1967-07-07
BE703705 1967-09-11

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US3511060A true US3511060A (en) 1970-05-12

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US741531A Expired - Lifetime US3511060A (en) 1967-07-07 1968-07-01 Defrosting device for a refrigerating machine

Country Status (7)

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US (1) US3511060A (de)
AT (1) AT290584B (de)
DE (1) DE1751643A1 (de)
GB (1) GB1224345A (de)
LU (1) LU56400A1 (de)
NL (1) NL6809526A (de)
NO (1) NO120078B (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3788394A (en) * 1972-06-01 1974-01-29 Motor Coach Ind Inc Reverse balance flow valve assembly for refrigerant systems
US4009594A (en) * 1975-06-02 1977-03-01 Whirlpool Corporation Hot gas defrosting apparatus
US4019341A (en) * 1975-12-03 1977-04-26 Moritaka Iwasaki Heat exchanging process of refrigerant gas in refrigerator
US4102151A (en) * 1976-04-20 1978-07-25 Kramer Trenton Company Hot gas defrost system with dual function liquid line
US4158950A (en) * 1978-02-16 1979-06-26 General Electric Company Heat pump defrost system
US4285210A (en) * 1980-04-28 1981-08-25 General Electric Company Self-contained heating and cooling apparatus
US4346566A (en) * 1981-06-04 1982-08-31 General Electric Company Refrigeration system gravity defrost
US4346565A (en) * 1981-06-04 1982-08-31 General Electric Company Gravity defrost
US4365983A (en) * 1979-07-13 1982-12-28 Tyler Refrigeration Corporation Energy saving refrigeration system
US6196007B1 (en) * 1998-10-06 2001-03-06 Manitowoc Foodservice Group, Inc. Ice making machine with cool vapor defrost

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3343375A (en) * 1965-06-23 1967-09-26 Lester K Quick Latent heat refrigeration defrosting system
US3358469A (en) * 1965-08-24 1967-12-19 Lester K Quick Refrigeration system condenser arrangement
US3392542A (en) * 1966-10-14 1968-07-16 Larkin Coils Inc Hot gas defrostable refrigeration system
US3427819A (en) * 1966-12-22 1969-02-18 Pet Inc High side defrost and head pressure controls for refrigeration systems

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3343375A (en) * 1965-06-23 1967-09-26 Lester K Quick Latent heat refrigeration defrosting system
US3358469A (en) * 1965-08-24 1967-12-19 Lester K Quick Refrigeration system condenser arrangement
US3392542A (en) * 1966-10-14 1968-07-16 Larkin Coils Inc Hot gas defrostable refrigeration system
US3427819A (en) * 1966-12-22 1969-02-18 Pet Inc High side defrost and head pressure controls for refrigeration systems

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3788394A (en) * 1972-06-01 1974-01-29 Motor Coach Ind Inc Reverse balance flow valve assembly for refrigerant systems
US4009594A (en) * 1975-06-02 1977-03-01 Whirlpool Corporation Hot gas defrosting apparatus
US4019341A (en) * 1975-12-03 1977-04-26 Moritaka Iwasaki Heat exchanging process of refrigerant gas in refrigerator
US4102151A (en) * 1976-04-20 1978-07-25 Kramer Trenton Company Hot gas defrost system with dual function liquid line
US4158950A (en) * 1978-02-16 1979-06-26 General Electric Company Heat pump defrost system
US4365983A (en) * 1979-07-13 1982-12-28 Tyler Refrigeration Corporation Energy saving refrigeration system
US4285210A (en) * 1980-04-28 1981-08-25 General Electric Company Self-contained heating and cooling apparatus
US4346566A (en) * 1981-06-04 1982-08-31 General Electric Company Refrigeration system gravity defrost
US4346565A (en) * 1981-06-04 1982-08-31 General Electric Company Gravity defrost
US6196007B1 (en) * 1998-10-06 2001-03-06 Manitowoc Foodservice Group, Inc. Ice making machine with cool vapor defrost

Also Published As

Publication number Publication date
LU56400A1 (de) 1968-10-21
AT290584B (de) 1971-06-11
NL6809526A (de) 1969-01-09
GB1224345A (en) 1971-03-10
NO120078B (de) 1970-08-24
DE1751643A1 (de) 1971-12-23

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