US3772897A - Defroster for a refrigerating system - Google Patents

Defroster for a refrigerating system Download PDF

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Publication number
US3772897A
US3772897A US00288666A US3772897DA US3772897A US 3772897 A US3772897 A US 3772897A US 00288666 A US00288666 A US 00288666A US 3772897D A US3772897D A US 3772897DA US 3772897 A US3772897 A US 3772897A
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US
United States
Prior art keywords
tank
freezing solution
solution
defroster
refrigerating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00288666A
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English (en)
Inventor
F Masuda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sakura Refrigerating and Heating Engineering Co Ltd
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Sakura Refrigerating and Heating Engineering Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sakura Refrigerating and Heating Engineering Co Ltd filed Critical Sakura Refrigerating and Heating Engineering Co Ltd
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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
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/06—Removing frost
    • F25D21/10—Removing frost by spraying with fluid

Definitions

  • a defroster removes a frost deposited onto an evapo- Mar 21 1972 Japan 47/27494 rator of a refrigerating system.
  • the defroster is so constructed that an anti-freezing solution preliminarily in- 52 U.S. Cl. 62/282 62/82 and within the refrigerating box 51 Int.
  • the present invention relates to a defroster, particularly to a defroster for removing a frost deposited onto an evaporator of a refrigerating system.
  • the object of the present invention is to provide a defroster capable of being incorporated easily into a refrigerating cycle system and capable of removing a frost deposited during the refrigeration cycle onto the evaporator without stopping or interrupting the refrigeration operation and without using a high temperature which causes some inconveniences in the refrigeration treatment.
  • the defroster use is positively made of the heat of a high-temperature high-pressure gaseous refrigerant circulating in the high pressure side of a refrigerating cycle system in general.
  • An anti-freezing solution preliminarily introduced and cooled in a refrigerating or cold box for a predetermined period of time is sprayed onto a frostdeposited evaporator to cause the frost to lower its fusing point.
  • the anti-freezing solution diluted by the front is sprayed onto the means, through which a high-temperature high-pressure gaseous refrigerant is passed, to cause the water in the diluted solution to be evaporated, thus increasing its concentration.
  • the so concentrated liquid is again used for defrosting.
  • a defroster for a refrigerating cycle system having a refrigerating box definging a space therein, an evaporator for refrigerating said space and a heat radiating member through which a heated refrigerant is passed; comprising a tank for receiving a anti-freezing solution, first means for supplying the anti-freezing solution from the tank to the evaporator so as to lower the fusing point of the frost deposited on the evaporator to melt the frost, second means for collecting and returnlng to the tank the anti-freezing solution diluted by the thawed frost, third means for supplying the antifreezing solution from the tank to the heat radiating member to evaporate it for concentration, fourth means for collecting and returning to the tank the concentrated anti-freezing solution, and pre-cooling means mounted in the refrigerating box to cool the antifreezing solution passing through the first means by a cold atmosphere in the space of the box.
  • FIGURE is a schematic, systematic view showing a defroster according to an embodiment of the present invention.
  • an evaporator 12 consisting of fin coils.
  • the evaporator 12 constituting one essential element of the known refrigerating cycle system is connected through a pipe 13 to the input terminal of a compressor not shown.
  • a heat radiating coil 14 is connected through a pipe 16 to the input terminal of a condenser 17.
  • the output terminal of the condensor 17 is connected through a pipe 18 to a receiver and then an expansion valve not shown, and through a pipe 19 to the evaporator.
  • a refrigerant performs a predetermined refrigerating function through a cycle including the evaporator, compressor, condenser receiver and expansion valve as is well known inthe art.
  • a defrosting device comprises an anti-freezing solution circulating system.for defrosting, an anti-freezing solution concentrating system and an anti-freezing solution reservoir tank 20 shared with both the systems.
  • the anti-freezing solution circulating system includes an inlet pipe 22 having one end connected to the tank 20 and the other end thereof extending within the casing 11 to introduce the anti-freezing solution in to the casing from the tank 20 under the pumping action of a pump 21. Situated above the evaporator coil 12 within the casing 11 is the extended end of the pipe 22 whichspraysthe anti-freezing solution through its no:- zle 23 onto a frost layer deposited on the fin coil. Below the coil 12 there is provided a funnel-like tray 24 for collecting the sprayed solution containing the water melted from'the frost. To the outlet of the tray 24 is connected one end of an outlet pipe 25 the other end of which 'is connected to the tank 20. The arrangement permits the anti-freezing solution collected within the tray to be returned to the tank.
  • a pre-cooler 27 manually operating valve. 37 and check valve 36 for sending, for a predetermined time period, a controlled amount of pre-cooled anti-freezing solution onto the evaporator.
  • the pre-cooler' 27 is disposed at the corner in the space of the refrigerating box 10 to give not so much affect to the refrigeration effect, and the antifreezing solution is cooled by a lower temperature atmosphere within-the refrigerator.
  • the pre-cooler 27 may take a variety of forms but, as a preferable form, use is made of bent rectangular pipes arranged one over the other at a multi-stepped, spaced-apart relation to raise a cooling effect with a smaller space occupied.
  • the anti-freezing solution led through check valve 36 from the tank 20 is sent to the pre-cooler 27 where it is held and pre-cooled for a predetermined period of time.
  • the pre-cooled liquid, as required, is supplied at a desired flow amount onto the evaporator 12 through a check valve 36.
  • the inlet and outlet pipes 22 and 25 are associated with each other outside the refrigerator to constitute a heat exchanger 26.
  • the heat exchanger 26 functions to cool that anti-freezing solution passing through the inlet pipe 22 raised to a relatively high temperature for the reasons set out below by that relatively lowtemperature anti-freezing solution passing through the outlet pipe 25 thereby precool the former solution before entry into a pre-cooler 27.
  • the heat transfer may be formed by either arranging the portions of the inlet pipe and outlet pipe at a coaxial array, or spirally winding the portion of the outlet pipe around the portion of the inlet pipe. Since the anti-freezing solution is sufficiently cooled by these two cooling mechanisms 26, 27 before being sprayed onto the evaporator 12, it will be understood that no refrigeration capability will be lowered, even if the anti-freezing solution is sprayed onto the evaporator.
  • an eliminator 28 Disposed above the nozzle 23 in the unit cooler casing 11 is an eliminator 28 for preventing an escape from the casing 11 of the anti-freezing solution sprayed from the nozzle 23. Also located above the eliminator 28 is a blower 29 for generating an upward directing air stream within the casing 11 to enhance a defrosting effeet.
  • the anti-freezing solution concentrating circulation system includes a concentrator 30, in which the heat radiating coil 14 is contained, and an inlet pipe 32 for introducing, under the action of a pump 31, the antifreezing solution from the tank into the concentrator 30.
  • a nozzle 33 mounted at the end of the inlet pipe 32 and within the concentrator is a nozzle 33 which is situated above the coil 14.
  • the antifreezing solution from the tank 20 is sprayed onto the heat radiating coil 14. This will cause some water contained in the sprayed solution to be evaporated since the high-temperature refrigerant is passed through the heat radiating coil 14. From this it will be understood that during the spraying the anti-freezing solution will be concentrated.
  • a funnel-like tray 34 for collecting the so-concentrated anti-freezing solution.
  • the outlet of the tray 34 is connected to the reservoir tank 20 through an outlet pipe 35. As a result the concentrated anti-freezing solution is returned to the tank.
  • an eliminator 40 is provided to trap droplets of the anti-freezing solution thereon, thereby preventing the dissipation of the solution. As a result only water vapor can be passed upwardly.
  • a blower for facilitating heat dissipation of the coil 14.
  • a liquid-level measuring device 38 of floating type is provided for measuring the liquid level of the anti-freezing solution within the tank.
  • This device is connected to a switch means 39 for selectively driving the pump 31.
  • the anti-freezing solution within the tank 20 is raised to a fairly high-temperature through the concentrating circulation system which is then sent through the heat exchanger 26 to the pre-cooler 27 where it is precooled for a predetermined period of time. Then it is sent to the nozzle 23, through which it is sprayed onto the coil 12 to cause the frost deposited thereon to be thawed.
  • the anti-freezing solution diluted by the thawed water is collected in the tray 24 and sent back to the tank 20 by way of the pipe 25. In this case the anti-freezing solution so returned to the tank is diluted and extended by the thawed water.
  • the diluted solution is concentrated through the concentration cycle to maintain at all times constant the concentration of the anti-freezing solution within the tank. That is, the anti-freezing solution within the tank is sprayed onto the radiator coil 14 through which the high-temperature refrigerant is passed so that the diluted anti-freezing solution is evaporated to cause it to be concentrated.
  • the soconcentrated high-temperature anti-freezing solution is collected in the tray 34 and then returned to the tank 20, where it is mixed with the diluted anti-freezing solution from the defrosting cycle.
  • the concentration of the solution within the tank 20 is maintained constant.
  • the defrosting circulation system of the defroster according to the present invention may be operated either continuously during the operation of the refrigeration cycle, or intermittently by means of a timer etc. Otherwise the defrosting circulation system of the defroster may be operated only for a predetermined period of time, taking into consideration the extent to which a frost is deposited onto the coil 12.
  • concentration means diluting anti-freezing solution the heat radiating coil is used in the present embodiment, the other means, such as for example a condenser, through which a high-temperature gaseous refrigerant is passed, may be used.
  • a defroster for a refrigerating cycle system having a refrigerating box defining a space therein, an evaporator for refrigerating said space and a heat radiating member through which a heated refrigerant is passed; comprising a tank for receiving an anti-freezing solu' tion, first means for supplying the anti-freezing solution from the tank to the evaporator so as to lower the fusing point of the frost deposited on the evaporator to melt the frost, second means for collecting and returning to the tank the anti-freezing solution diluted by the thawed frost, third means for supplying the antifreezing solution from the tank to the heat radiating member to evaporate it for concentration, fourth means for collecting and returning to the tank the concentrated antifreezing solution, and pre-cooling means mounted in the refrigerating box to cool the antifreezing solution passing through the first means by a cold atmosphere in the space of the box.
  • a defroster according to claim 1 further including a heat exchanger constituted by the parts of the first and second means to cool the anti-freezing solution in switch means connected to the device to operate the third means when the anti-freezing solution in the tank is reached at more than a predetermined level.
  • line 21 delete "up” lines 21 and 22, delete "unless lapsed for a predetermined” and insert in a short; line 22, after “During” change “the” to --this--; a line 26, after “resulting in” delete "an” line .31 after “removing” delete a” between lines 36 and 37 insert the heading Summary of the Inventionline 46, after “means” delete line 53, ehange “definging” to defining line 55, after "passed” delete insert line 56, delete "comprising" insert I'he defroster comprises--; change "a” (last occurrence) to --an-;
  • FoRM PO-1050 (10-69) USCOMWDC l-Ls. GOVEINMIkT PIINTIHG OFFICE II. oP'all'lal,

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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)
  • Defrosting Systems (AREA)
US00288666A 1972-03-21 1972-09-13 Defroster for a refrigerating system Expired - Lifetime US3772897A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47027494A JPS4895642A (enrdf_load_stackoverflow) 1972-03-21 1972-03-21

Publications (1)

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US3772897A true US3772897A (en) 1973-11-20

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US00288666A Expired - Lifetime US3772897A (en) 1972-03-21 1972-09-13 Defroster for a refrigerating system

Country Status (5)

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US (1) US3772897A (enrdf_load_stackoverflow)
JP (1) JPS4895642A (enrdf_load_stackoverflow)
BR (1) BR7301929D0 (enrdf_load_stackoverflow)
GB (1) GB1375428A (enrdf_load_stackoverflow)
SU (1) SU469271A3 (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3854302A (en) * 1972-09-13 1974-12-17 Sakura Refrigerating & Heating Defroster for a refrigerating system
WO1993016341A1 (en) * 1992-02-14 1993-08-19 Niagara Blower Company Method and apparatus for providing refrigerated air
US5249433A (en) * 1992-03-12 1993-10-05 Niagara Blower Company Method and apparatus for providing refrigerated air
EP0940786A2 (en) 1998-03-02 1999-09-08 NCR International, Inc. Method for providing security and enhancing efficiency during operation of a self-service checkout terminal
US20150013354A1 (en) * 2013-07-15 2015-01-15 Luis Carlos Gabino Barrera Ramirez Hot liquid wash defrosting methods and systems
EP2505929A3 (en) * 2011-03-28 2018-03-21 LG Electronics, Inc. Outdoor unit of air conditioner and method for controlling the same
DE102018127373A1 (de) * 2018-11-02 2020-05-07 Vaillant Gmbh Enteisung von Wärmepumpenaußeneinheiten

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62129675A (ja) * 1985-11-27 1987-06-11 ダイエ−食品工業株式会社 冷凍機の霜取り方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2323511A (en) * 1941-10-24 1943-07-06 Carroll W Baker Refrigerating and air conditioning apparatus
US2526032A (en) * 1948-10-11 1950-10-17 Francis L La Porte Defrosting method and apparatus for refrigeration systems
US2672024A (en) * 1951-01-12 1954-03-16 Carrier Corp Air conditioning system employing a hygroscopic medium
US2747382A (en) * 1952-12-17 1956-05-29 Vilter Mfg Co System for concentrating anti-freeze solution
US2748574A (en) * 1952-03-24 1956-06-05 Weber Showcase & Fixture Co In Water defrost refrigerated showcase

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2323511A (en) * 1941-10-24 1943-07-06 Carroll W Baker Refrigerating and air conditioning apparatus
US2526032A (en) * 1948-10-11 1950-10-17 Francis L La Porte Defrosting method and apparatus for refrigeration systems
US2672024A (en) * 1951-01-12 1954-03-16 Carrier Corp Air conditioning system employing a hygroscopic medium
US2748574A (en) * 1952-03-24 1956-06-05 Weber Showcase & Fixture Co In Water defrost refrigerated showcase
US2747382A (en) * 1952-12-17 1956-05-29 Vilter Mfg Co System for concentrating anti-freeze solution

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3854302A (en) * 1972-09-13 1974-12-17 Sakura Refrigerating & Heating Defroster for a refrigerating system
WO1993016341A1 (en) * 1992-02-14 1993-08-19 Niagara Blower Company Method and apparatus for providing refrigerated air
US5249433A (en) * 1992-03-12 1993-10-05 Niagara Blower Company Method and apparatus for providing refrigerated air
EP0940786A2 (en) 1998-03-02 1999-09-08 NCR International, Inc. Method for providing security and enhancing efficiency during operation of a self-service checkout terminal
EP2505929A3 (en) * 2011-03-28 2018-03-21 LG Electronics, Inc. Outdoor unit of air conditioner and method for controlling the same
US20150013354A1 (en) * 2013-07-15 2015-01-15 Luis Carlos Gabino Barrera Ramirez Hot liquid wash defrosting methods and systems
US9513046B2 (en) * 2013-07-15 2016-12-06 Luis Carlos Gabino Barrera Ramirez Hot liquid wash defrosting methods and systems
DE102018127373A1 (de) * 2018-11-02 2020-05-07 Vaillant Gmbh Enteisung von Wärmepumpenaußeneinheiten

Also Published As

Publication number Publication date
JPS4895642A (enrdf_load_stackoverflow) 1973-12-07
AU4656172A (en) 1974-03-21
GB1375428A (enrdf_load_stackoverflow) 1974-11-27
BR7301929D0 (pt) 1974-08-29
SU469271A3 (ru) 1975-04-30

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