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US2755371A - Defroster for freezing coils - Google Patents

Defroster for freezing coils Download PDF

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Publication number
US2755371A
US2755371A US343726A US34372653A US2755371A US 2755371 A US2755371 A US 2755371A US 343726 A US343726 A US 343726A US 34372653 A US34372653 A US 34372653A US 2755371 A US2755371 A US 2755371A
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Prior art keywords
freezing
coils
defroster
freezing coils
temperature
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Expired - Lifetime
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US343726A
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Earl R Jackson
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Priority to US343726A priority Critical patent/US2755371A/en
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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
    • 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
    • F25D21/08—Removing frost by electric heating
    • 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

  • This invention relates to defrosting devices for refrigerators, deep freezers and cooling systems and more particularly to a method and apparatus particularly adapted for use in preventing heavy accumulations of ice and frost from forming on the freezer coils and decreasing their cooling efiiciency.
  • the general practice heretofore used in defrosting the freezing compartment of various units has been to raise the temperature within the enclosure by positioning external heating units in the spacing between the freezing coils, or by blowing hot air against the freezing coils to melt the ice or frost therefrom.
  • An important object of this invention is the provision of a defrosting device that will quickly and efliciently free the cooling coils of ice.
  • Another object of this invention is the provision of a defrosting device that will expeditiously defrost the cooling unit with Very little rise in temperature in its enclosure.
  • Another object of the invention is to provide a series of freezing coils having closed end tubes preferably in serted at a predetermined number of bends in the freezing coils to receive interchangeable heating units to quickly increase the temperature of the freezing medium contained in the coils Without changing the temperature of the freezing medium in the system other than in the freezing coils.
  • the single figure of the drawing represents a side elevation of a freezing coil unit embodying this invention, with parts broken away to show the method of mounting the heating units therein.
  • a freezing unit 10 is formed of tubing or the like 11 provided with holes 12 at predetermined bends to receive heat unit closures 14 to enclose the heating units 15 and prevent the heaters from coming into direct contact with the freezing medium 17. This allows the heaters to be replaced when necessary without draining the freezing medium from the system.
  • Each closure 14 is closed at one end, and open at the other end to receive the heater, and is welded at 19 to provide a leakproof joint between the closure 14 and the bends 13.
  • the heating units are connected into an electrical circuit 18 and are automatically turned off and on at predetermined intervals by the use of any of the conventional time or temperature controlled electric switches that can be used to stop the circulation of the refrigerant and turn on the heaters to raise the temperature of the freezing medium in the freezing unit or coils 10 at predetermined intervals without appreciably raising the temperature of the freezing medium in the rest of the system, this enables the system to be defrosted more quickly when using this invention.
  • an evaporator comprising a plurality of parallel straight sections, a plurality of U-shaped sections each associated with two straight sections of one of said pairs for connecting said sections to each other, an enclosing element projecting from the exterior of certain of said U-shaped sections into one of the straight sections associated therewith, an electric heating element removably positioned in each of said enclosing elements and means forming with said heating elements an electric circuit whereby refrigerant in all of the portions of said evaporator may be subjected to a heating influence to melt from the evaporator frost and ice formed thereon.

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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)

Description

y 1956 E. R. JACKSON 2,755,371
DEFROSTER FOR FREEZING COILS Filed March 20. 1953 EARL R. J/ICKSON.
IN VEN TOR.
Wm; M.
ATTORNEY:
DEFROSTER FOR FREEZING COILS Earl R. Jackson, Baltimore, Md.
Application March 20, 1953, Serial No. 343,726
1 Claim. (Cl. 219-19) This invention relates to defrosting devices for refrigerators, deep freezers and cooling systems and more particularly to a method and apparatus particularly adapted for use in preventing heavy accumulations of ice and frost from forming on the freezer coils and decreasing their cooling efiiciency.
The general practice heretofore used in defrosting the freezing compartment of various units has been to raise the temperature within the enclosure by positioning external heating units in the spacing between the freezing coils, or by blowing hot air against the freezing coils to melt the ice or frost therefrom.
An important object of this invention is the provision of a defrosting device that will quickly and efliciently free the cooling coils of ice.
Another object of this invention is the provision of a defrosting device that will expeditiously defrost the cooling unit with Very little rise in temperature in its enclosure.
Another object of the invention is to provide a series of freezing coils having closed end tubes preferably in serted at a predetermined number of bends in the freezing coils to receive interchangeable heating units to quickly increase the temperature of the freezing medium contained in the coils Without changing the temperature of the freezing medium in the system other than in the freezing coils.
Other objects of the invention will become apparent as the invention is more fully set forth.
For a clearer understanding of the invention and its objects, reference is made to the accompanying drawing, wherein a particular form of the invention is disclosed. This drawing when used in conjunction with the following description illustrates such form by way of example, while the claim emphasizes the scope of the invention.
The single figure of the drawing represents a side elevation of a freezing coil unit embodying this invention, with parts broken away to show the method of mounting the heating units therein.
Similar reference numerals refer to similar objects throughout the drawing.
In the construction shown in the drawing a freezing unit 10 is formed of tubing or the like 11 provided with holes 12 at predetermined bends to receive heat unit closures 14 to enclose the heating units 15 and prevent the heaters from coming into direct contact with the freezing medium 17. This allows the heaters to be replaced when necessary without draining the freezing medium from the system. Each closure 14 is closed at one end, and open at the other end to receive the heater, and is welded at 19 to provide a leakproof joint between the closure 14 and the bends 13. The heating units are connected into an electrical circuit 18 and are automatically turned off and on at predetermined intervals by the use of any of the conventional time or temperature controlled electric switches that can be used to stop the circulation of the refrigerant and turn on the heaters to raise the temperature of the freezing medium in the freezing unit or coils 10 at predetermined intervals without appreciably raising the temperature of the freezing medium in the rest of the system, this enables the system to be defrosted more quickly when using this invention.
While but one general form of the invention is shown in the drawing and described in the specification, it is not desired to limit this application for patent to this particular form as it is appreciated that other forms of construction could be made that would use the same principles and come within the scope of the appended claim.
Having thus described the invention, what is claimed is:
In a refrigeration system of the dry expansion type, an evaporator comprising a plurality of parallel straight sections, a plurality of U-shaped sections each associated with two straight sections of one of said pairs for connecting said sections to each other, an enclosing element projecting from the exterior of certain of said U-shaped sections into one of the straight sections associated therewith, an electric heating element removably positioned in each of said enclosing elements and means forming with said heating elements an electric circuit whereby refrigerant in all of the portions of said evaporator may be subjected to a heating influence to melt from the evaporator frost and ice formed thereon.
References Cited in the file of this patent UNITED STATES PATENTS 1,676,068 Bayer July 3, 1928 1,731,058 Pierson Oct. 8, 1929 1,764,139 Alex June 17, 1930 2,001,323 Dick May 14, 1935
US343726A 1953-03-20 1953-03-20 Defroster for freezing coils Expired - Lifetime US2755371A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US343726A US2755371A (en) 1953-03-20 1953-03-20 Defroster for freezing coils

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US343726A US2755371A (en) 1953-03-20 1953-03-20 Defroster for freezing coils

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US2755371A true US2755371A (en) 1956-07-17

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US343726A Expired - Lifetime US2755371A (en) 1953-03-20 1953-03-20 Defroster for freezing coils

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2920377A (en) * 1956-10-12 1960-01-12 Gen Electric Evaporator structure and method of manufacture
US3011767A (en) * 1959-08-03 1961-12-05 Dole Refrigerating Co Cold plate with conversion heater assembly
US3087797A (en) * 1961-04-24 1963-04-30 Lummus Co Regenerative furnace
US3212287A (en) * 1964-06-22 1965-10-19 Whirlpool Co Connector and seal for defrost heater
US7712327B2 (en) 2007-03-19 2010-05-11 Colmac Coil Manufacturing, Inc. Heat exchanger and method for defrosting a heat exchanger
CN108981272A (en) * 2018-08-07 2018-12-11 浙江华美电器制造有限公司 Refrigeration system of refrigerator with defrosting function

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1676068A (en) * 1925-05-22 1928-07-03 Bayer Gaudenz Refrigerating apparatus
US1731058A (en) * 1925-06-27 1929-10-08 Standard Electric Stove Co Water heater
US1764139A (en) * 1928-06-02 1930-06-17 Summit Corp Heater
US2001323A (en) * 1931-04-29 1935-05-14 Gen Motors Corp Refrigerating apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1676068A (en) * 1925-05-22 1928-07-03 Bayer Gaudenz Refrigerating apparatus
US1731058A (en) * 1925-06-27 1929-10-08 Standard Electric Stove Co Water heater
US1764139A (en) * 1928-06-02 1930-06-17 Summit Corp Heater
US2001323A (en) * 1931-04-29 1935-05-14 Gen Motors Corp Refrigerating apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2920377A (en) * 1956-10-12 1960-01-12 Gen Electric Evaporator structure and method of manufacture
US3011767A (en) * 1959-08-03 1961-12-05 Dole Refrigerating Co Cold plate with conversion heater assembly
US3087797A (en) * 1961-04-24 1963-04-30 Lummus Co Regenerative furnace
US3212287A (en) * 1964-06-22 1965-10-19 Whirlpool Co Connector and seal for defrost heater
US7712327B2 (en) 2007-03-19 2010-05-11 Colmac Coil Manufacturing, Inc. Heat exchanger and method for defrosting a heat exchanger
CN108981272A (en) * 2018-08-07 2018-12-11 浙江华美电器制造有限公司 Refrigeration system of refrigerator with defrosting function

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