US3173767A - Low pressure steam laundry drying machine - Google Patents

Low pressure steam laundry drying machine Download PDF

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Publication number
US3173767A
US3173767A US141436A US14143661A US3173767A US 3173767 A US3173767 A US 3173767A US 141436 A US141436 A US 141436A US 14143661 A US14143661 A US 14143661A US 3173767 A US3173767 A US 3173767A
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US
United States
Prior art keywords
air
heat exchanger
drum
steam
inlet
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
US141436A
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English (en)
Inventor
Perloff Gerald
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.)
INTERNATIONAL DRYER CORP
Original Assignee
Internat Dryer Corp
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 Internat Dryer Corp filed Critical Internat Dryer Corp
Priority to US141436A priority Critical patent/US3173767A/en
Priority claimed from GB47088/64A external-priority patent/GB1048056A/en
Priority to GB47088/64A priority patent/GB1048056A/en
Priority claimed from FR997878A external-priority patent/FR1416880A/fr
Priority to FR997878A priority patent/FR1416880A/fr
Priority to NL6414418A priority patent/NL6414418A/xx
Priority to BE657075A priority patent/BE657075A/fr
Priority claimed from BE657075A external-priority patent/BE657075A/fr
Publication of US3173767A publication Critical patent/US3173767A/en
Application granted granted Critical
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/26—Heating arrangements, e.g. gas heating equipment
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/02—Domestic laundry dryers having dryer drums rotating about a horizontal axis

Definitions

  • FIGZ G. PERLOFF March 16, 1965 LOW PRESSURE STEAM LAUNDRY DRYING MACHINE 2 Sheets-Sheet 1 Filed Sept. 28, 1961 FIG] FIGZ
  • This invention relates to a method and means for drying clothes, and more particularly to a drying machine utilizing low pressure steam as the heating medium.
  • the present invention utilizes a special heat exchanger having a plurality of steam coils connected in parallel by inlet and outlet headers.
  • Each coil comprises no more than 4 parallel sections connected by loops so that the length of each passage of the steam in the exchanger is relatively short, and the steam coils being arranged with the parallel sections in substantially vertical planes permit the lowest section to retain practically the same temperature and pressure as the uppermost section.
  • Each of the steam coils has aflixed to its surface thin closely spaced heat conduction and radiation plates forming a multiplicity of laminar paths for air drawn downwardly in substantially vertical directions through the heat exchanger.
  • the exchanger is supported on a special support and air deflector which forms a passage for the heated air toward the clothes receiving drum and some at least of whose sides are inclined inwardly to restrict the area of the passage so that eddy currents are formed redirecting a portion of the air into the laminar spaces between the heat transfer plates.
  • bafiles are provided completely around the perforated drum containing the clothing to be dried having an air inlet which, considering the number and size of perforations in the drum, is made to have an effective air passage area less than the total cross sectional area for air flow in the laminar air paths in the heat exchanger. This, again, slows the passage of air and insures that the heat exchanger support and air deflector will redirect a portion of the air back to the heat ex- 3,l?3,?67 Patented Mar.
  • a drier thus constructed has been, found by experience to have a lower operating cost than any available commercial drier. For example, one hour drying time with a low pressure steam device according to the invention costs approximately 12, whereas high pressure steam costs approximately 15 and natural gas as the heating medium costs 18. Other types of gas are even more costly.
  • a device according to the invention has been found to yield a suitable air temperature in the drum or approximately 180 F. This is more than adequate to dry clothes without scorching the same.
  • a primary object of the present invention is to provide a clothes dryer which will operate at steam pressures below 15 p.s.i.g. and provide an effective temperature of nearly 180 F. in the dryer.
  • Another object of the invention is to provide a laundry drying machine in which the air is distributed by deflectors, bafiles and similar internal devices so as to effectively utilize the lower temperature of low pressure steam.
  • a further object of the invention is to provide a clothes dryer of the above described characteristics which will operate at reduced costs, increased safety compared to conventional steam and gas driers and eliminate the problems of an open flame in a gas type clothes drier.
  • Still another object of the invention is to provide a drier of the above described characteristics which is simple in construction, relatively inexpensive to fabricate and yet effective in operation.
  • a still further object of the invention is to provide a method for utilizing low pressure steam in the drying of laundry.
  • FIG. 1 is a front elevation of a clothes dryer constructed in accordance with the invention and from which the front panels have been removed for revealing internal elements and features;
  • FIG. 2 is a rear elevation of the drier shown in FIG. 1;
  • FIG. 3 is an exploded perspective view on a larger scale of the heat exchanger and its air deflector support
  • FIG. 4 is a side elevation of the drier shown in FIG. 1 with portions of the side wall removed;
  • FIG. 5 is a vertical, central, sectional view of the drier.
  • FIG. 6 is an enlarged perspective view of the impeller used in the dryer.
  • the numeral 19 generally designates a cabinet which completely encloses the drier except for the opening 12 at the top of the rear side 14.
  • an electric motor 16 furnishing power to drive the rotating drum Ztl as well as the impeller blades 40.
  • the drum 26 is mounted for revolving about horizontal axle 22 and has its cylindrical wall perforated throughout by numerous evenly spaced, small openings 24. Inside the drum are a plurality of partitions 26 which aid in tumbling the clothes during revolution of the drum.
  • the drum is turned through a speed reduction mechanism comprising a pair of small pulleys 28 on the axle of motor 1 6, a pair of larger pulleys 3t) linked by a pair of belts 32, small pulleys 34 fixed to the axles bearing pulleys 30 and a large pulley wheel 36 fixed to the drum axle 22 linked by a pair of belts 33.
  • V speed reduction mechanism
  • the motor 16 drives blades 40 of a backward wave impellermounted ion the motor .shaft18 extending into the drier cabinet through the rear wall '14 and centrally near the :bottom of the cabinet.
  • the impeller blades are revolved at a high speed and operate in a shroud 42 so as tobe capable of moving 800 cubic feet of 'air per minute against a static head of 1.2 inches of water pressure.
  • the air is moved out of the cabinet in the directions of the arrows shown in FIG. 6 and through the cylindrical outlet 48 which :is normally closed by a door 45 when the drier is not in operation.
  • the door 46 turns on the pivot shaft 44 to permit egress of the air from the cabinet when the drier is in use.
  • the impeller casing 42 is preferably formed by the rear wall 14 of the drier at one side spaced from .an opposite wall of the casing '42 by distance slightly greater than the width of the impeller blades 40.
  • a circular opening 43 is formed at one end of the inside wall of the impeller shroud 42 to admit entrance of air being evcuated by the impeller and the circularzduct 48 passes through a similarly shaped opening in the rear wall of the cabinet at the other end of the impeller'shroud for exit of such air.
  • a heat "exchanger of special design is provided in the top portion of the cabinet centrally located above the revolving drum 2t) and designated by the general reference character 50.
  • This exchanger comprises vertical walls 52 forming a rectangular frame and having outwardly disposed projecting flanges 54 and 55 at its top and bottom edges respectively.
  • Through opposite walls of the frame 2 are passed a number of steam coils 56 which are linked'together by loops 58 and 60 outside of the frame 52 at the rear and front of the heat exchanger respectively.
  • Each conduit or coil 56 comprises no more than four parallel horizontal tube sections joined by said loops 58 and 6t) to form a four pass coil and each of the described coils are connected in parallel by means of the inlet header 62 and the outlet header-64 at the rear of the heat exchanger.
  • each coil 56 of the heat exchanger is provided with a plurality of thin, closely spaced, parallel heat exchange plates 70 whichare arranged to form thin laminar air paths vertically through'the heat exchanger.
  • the plates 70 are soldered, welded or'otherwise suitably'connected to tubes 56 and are adapted to conduct and radiate heat to the air as it is drawn downwardly through the heat exchanger.
  • a shelf 72 having a central opening in which is secured the combined air deflector and heat exchanger support 76.
  • This device is best illustrated in FIG. 3 and comprises vertical walls 78 at opposite ends connected by downwardly and inwardly inclined walls 80. From the latter a pair of upwardly projected flanges 82 are extended for seating inside the frame '52 of the heat exchanger and a pair of outwardly extended flanges 84 for supporting the bottom flanges 55 of the heat exchanger.
  • a pair of vertical deflector plates 92 which extend the heated air passage to within a short distance from the drum 29. These plates 92, together with the front and rear Walls of the cabinet and the support'76 define the walls of a continuous passage for conducting heated air from the heat exchanger 59 to the revolving drum 2t).
  • a baifle of cylindrical shape '94 with a rectangular opening 93 at its top to permit entrance of the walls 92 and inlet of the air therebetwecn and a rectangular outlet 96 placed atone side of the vertical, central axis of the bafide 94 and toward the front thereof as best illustrated in FIGS. 1 and '4.
  • the outlet 96 extends about two-thirds of the length of the baffle '94 and is aligned for permitting exhaust of air fromthe drum and baffie in a direction toward the left bottomand front of the drier cabinet.
  • a novel lint screen which with its support is generally designated liiti.
  • This .screen comprises a vertical wall 192 having an opening fitting about the impeller shroud 42 and secured thereto in any suitable manner. Slightly above the impeller is .a horizontally disposed wall Ed t extending from the impeller shroud toward the front of the cabinet. Walls 102 and 194 are joined by triangular side panels 1% whose lower edges are inclined upwardly and forwardly toward the front of cabinet it). These lower edges are inturned to provide tracks 107, PEG. 1 into which is removably slid a flat perforated screen 1&5, thus, as seen from FIGS.
  • This movement is also accompanied by reflection from the bafiie of the heated air back through the openings 24 into the drum, and a certain amount of eddying back and forth between the drum and the bafile 94 occurs to aid in the transfer of the warmth from the air to the damp clothing to insure adequate drying of the clothing.
  • a low pressure steam drier comprising a drum having a perforated periphery and rotatable on an axis, means for causing air to move through said perforated drum while the latter is rotating, a battle conforming in shape to and closely surrounding said drum, an air inlet and an air outlet in said baffle, a heat exchanger supported ahead of the said inlet adapted to receive steam at 15 p.s.i.g.
  • said exchanger having side walls defining a frame and including a plurality of steam conduits each comprising a tube having no more than four parallel sections supported by opposite walls of said frame and con nected in series by loops, an inlet manifold connecting one end of each of said conduits, an outlet manifold connecting the other end of each of said conduits to provide steam paths in parallel, each conduit having substantially the same low inlet and outlet steam pressures, a plurality of closely spaced heat transfer plates mounted on said conduits arranged to provide laminar paths for air flow in the heat exchanger past said conduits and parallel to the side walls of the frame of the exchanger, and a passage connecting said heat exchanger to said baffle air inlet, at least a pair of the walls of said passage being in planes at right angles to said transfer plates and inclined inwardly to redirect heated air back to said laminar paths and to restrict the air passage connecting the heat exchanger to the bafile air inle the effective total cross sectional area of the perforations in said drum underlying said bafi le air in
  • a low pressure steam drier according to claim 1 wherein said heat exchanger walls are vertically disposed and provided with outwardly extending support flanges, said pair of walls of the passage connecting the heat exchanger to the bathe air inlet having upward vertical extensions which fit between and adjacent to corresponding walls of the exchanger frame and horizontal extensions supporting said flanges and a plurality of vertical deflector plates extending downwardly from the walls of said air passage through said batlle inlet to points spaced immediately adjacent but Without touching said drum.
  • a drier according to claim 2 wherein said drum is rotatable on a horizontal axis, said heat exchanger being seated above the drum and together with said air inlet to the baflle being arranged centrally over the drum, said balile outlet being disposed below and at one side of the drum axis, said means for causing air flow including a backward wave impeller mounted centrally below said drum and encased in a shroud having anair outlet at one side in combination with a lint screen preventing entrance of lint to said impeller shroud, said lint screen comprising a vertical wall adjacent said impeller shroud and having an opening communicating therewith, a substantially horizontal top wall at approximately the level of the top of the impeller, a pair of triangular shaped side walls, and a perforated wall slideably and removably supported by the edges of'said triangular walls.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
US141436A 1961-09-28 1961-09-28 Low pressure steam laundry drying machine Expired - Lifetime US3173767A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US141436A US3173767A (en) 1961-09-28 1961-09-28 Low pressure steam laundry drying machine
GB47088/64A GB1048056A (en) 1961-09-28 1964-11-19 Improvements in or relating to low pressure steam drying method and machine
FR997878A FR1416880A (fr) 1961-09-28 1964-12-08 Procédé et dispositif pour le séchage du linge
NL6414418A NL6414418A (enrdf_load_stackoverflow) 1961-09-28 1964-12-11
BE657075A BE657075A (enrdf_load_stackoverflow) 1961-09-28 1964-12-14

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US141436A US3173767A (en) 1961-09-28 1961-09-28 Low pressure steam laundry drying machine
GB47088/64A GB1048056A (en) 1961-09-28 1964-11-19 Improvements in or relating to low pressure steam drying method and machine
FR997878A FR1416880A (fr) 1961-09-28 1964-12-08 Procédé et dispositif pour le séchage du linge
NL6414418A NL6414418A (enrdf_load_stackoverflow) 1961-09-28 1964-12-11
BE657075A BE657075A (enrdf_load_stackoverflow) 1961-09-28 1964-12-14

Publications (1)

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US3173767A true US3173767A (en) 1965-03-16

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US141436A Expired - Lifetime US3173767A (en) 1961-09-28 1961-09-28 Low pressure steam laundry drying machine

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US (1) US3173767A (enrdf_load_stackoverflow)
NL (1) NL6414418A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060137206A1 (en) * 2004-11-30 2006-06-29 Lg Electronics, Inc. Composite washing system
US20060150689A1 (en) * 2004-12-09 2006-07-13 Lg Electronics Inc. Combination laundry device and method thereof
US20060151009A1 (en) * 2004-12-09 2006-07-13 Lg Electronics Inc. Operation method of laundry device
US20080034608A1 (en) * 2004-12-06 2008-02-14 Seung-Phyo Ahn Clothes Dryer
US20080148943A1 (en) * 2006-12-22 2008-06-26 G.A. Braun Inc. Lint Collection Device, Method and System for Fabric Dryers
US7658015B1 (en) * 2007-05-15 2010-02-09 Gardell Christopher M Clothes drying device
US20100050464A1 (en) * 2008-08-29 2010-03-04 Mabe Canada Inc. Clothes dryer apparatus and method for de-wrinkling clothes with reduced condensation

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1213999A (en) * 1914-04-27 1917-01-30 Troy Laundry Machinery Co Ltd Drying apparatus.
US1765628A (en) * 1925-11-02 1930-06-24 American Laundry Mach Co Drying machine
US2110024A (en) * 1936-08-29 1938-03-01 Gen Electric Heat exchange unit
US2361297A (en) * 1941-12-26 1944-10-24 Alfred P Kutsche Rotary garment drier
US2595663A (en) * 1949-02-01 1952-05-06 American Laundry Mach Co Delayed-action signal for damper control

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1213999A (en) * 1914-04-27 1917-01-30 Troy Laundry Machinery Co Ltd Drying apparatus.
US1765628A (en) * 1925-11-02 1930-06-24 American Laundry Mach Co Drying machine
US2110024A (en) * 1936-08-29 1938-03-01 Gen Electric Heat exchange unit
US2361297A (en) * 1941-12-26 1944-10-24 Alfred P Kutsche Rotary garment drier
US2595663A (en) * 1949-02-01 1952-05-06 American Laundry Mach Co Delayed-action signal for damper control

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060137206A1 (en) * 2004-11-30 2006-06-29 Lg Electronics, Inc. Composite washing system
US8695228B2 (en) * 2004-11-30 2014-04-15 Lg Electronics Inc. Composite washing system
US20080034608A1 (en) * 2004-12-06 2008-02-14 Seung-Phyo Ahn Clothes Dryer
US7908766B2 (en) * 2004-12-06 2011-03-22 Lg Electronics Inc. Clothes dryer
US20060150689A1 (en) * 2004-12-09 2006-07-13 Lg Electronics Inc. Combination laundry device and method thereof
US20060151009A1 (en) * 2004-12-09 2006-07-13 Lg Electronics Inc. Operation method of laundry device
US7624466B2 (en) * 2004-12-09 2009-12-01 Lg Electronics Inc. Operation method of laundry device
US7647663B2 (en) * 2004-12-09 2010-01-19 Lg Electronics Inc Combination laundry device and method thereof
US20080148943A1 (en) * 2006-12-22 2008-06-26 G.A. Braun Inc. Lint Collection Device, Method and System for Fabric Dryers
US7886458B2 (en) * 2006-12-22 2011-02-15 G.A. Braun Inc. Lint collection apparatus and system for fabric dryers
US7658015B1 (en) * 2007-05-15 2010-02-09 Gardell Christopher M Clothes drying device
US20100050464A1 (en) * 2008-08-29 2010-03-04 Mabe Canada Inc. Clothes dryer apparatus and method for de-wrinkling clothes with reduced condensation

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NL6414418A (enrdf_load_stackoverflow) 1966-06-13

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