EP0049170A2 - Séchoir à tambour rotatif - Google Patents

Séchoir à tambour rotatif Download PDF

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Publication number
EP0049170A2
EP0049170A2 EP81304529A EP81304529A EP0049170A2 EP 0049170 A2 EP0049170 A2 EP 0049170A2 EP 81304529 A EP81304529 A EP 81304529A EP 81304529 A EP81304529 A EP 81304529A EP 0049170 A2 EP0049170 A2 EP 0049170A2
Authority
EP
European Patent Office
Prior art keywords
machine
heat source
drum
air
temperature
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.)
Withdrawn
Application number
EP81304529A
Other languages
German (de)
English (en)
Other versions
EP0049170A3 (fr
Inventor
William George Charles Knowles
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0049170A2 publication Critical patent/EP0049170A2/fr
Publication of EP0049170A3 publication Critical patent/EP0049170A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • D06F58/32—Control of operations performed in domestic laundry dryers 
    • D06F58/34—Control of operations performed in domestic laundry dryers  characterised by the purpose or target of the control
    • D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F58/38—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry of drying, e.g. to achieve the target humidity
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/28—Air properties
    • D06F2103/32—Temperature
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/38—Time, e.g. duration
    • 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/30—Blowers
    • 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/46—Drum speed; Actuation of motors, e.g. starting or interrupting

Definitions

  • This invention relates to tumble drying machines and to a method of operating such machines.
  • the present invention aims to overcome the above-mentioned problem and provides a tumble dryer machine having a rotatable drum, a fan for circulating air from an inlet through the drum to an outlet, a primary heat source for heating the air, motor means for operating said fan and said drum, and control means including temperature-sensitive means which is operative to operate said motor means and prevent operation of said heat source at the end of a drying cycle and to stop said motor means when the temperature sensed by the temperature sensitive means is reduced to a predetermined value.
  • the temperature-sensitive means preferably senses the temperature of the air at the outlet.
  • it comprises a single pole changeover thermo-disc type switch connected in an electrical circuit incorporating said motor means. The switch breaks the circuit below the predetermined temperature and makes the circuit above the temperature.
  • the invention also provides a method of controlling the cycle of a tumble dryer comprising a fan, a drum and a primary heat source, said method comprising operating said fan, drum and heat source simultaneously, switching off said heat source whilst still operating said fan and drum, sensing the temperature of the air exiting from said drum and switching off said fan and drum when said sensed temperature reaches a predetermined value.
  • the duration of the over-run part of the cycle, when the heat source is inoperative is dependent upon the temperature of the exhaust air, which is itself dependent upon the residual heat of the machine.
  • a heat exhanger through separate channels of which inlet and outlet air respectively pass, the outlet air serving to warm the inlet air during operation of the - machine.
  • the tumble dryer machine comprises a housing 1 attached to the rear of which is the heat exchanger 2 and control device 3 and within which are located, in the direction of air flow, a primary heat source 4, a rotatable perforated drum 5 and a fan 6.
  • the drum 5 and the fan 6 are operated by a motor 7.
  • ambient air is drawn through inlet 8 of the heat exchanger 2, along parallel inlet tubes 9 formed in the heat exchanger, through an opening 10 and over the heat source 4. From there the air passes through the perforated drum 5, where the air becomes moist, past the fan 6 and through a heat-resistant, flexible hose 11 to an opening 12 at the bottom of the heat exchanger.
  • the air passes through parallel outlet tubes (not shown) of the heat exchanger to a heat-resistant, flexible exhaust hose 13 and from there to atmosphere.
  • the heat exchanger is so arranged that substantially all of the inlet air passes therethrough.
  • the inlet and exhaust tubes of the heat exchanger are arranged alternately and are preferably rectangular in cross section, having smooth uninterrupted surfaces, without ripples, indentations or projections such as rivets, to reduce the risk of blockage by lint and fluff.
  • Each hose 11,13 is attached to a full-width cover plate 14 which is secured to the top or bottom of the heat exchanger by two quick-release clips 15.
  • the plates 14 allow quick and easy access to the heat exchange tubes for cleaning.
  • the heat exchanger works as follows.
  • the hot, humid air enters the exchanger at opening 12, passes through the exchanger and exits to atmosphere.
  • this exhaust air gives up part of its heat to the fresh air entering the tumble drying machine.
  • This heat gain to the fresh air entering the machine causes it to-increase in temperature prior to it reaching the primary heating source 4; thus this fresh air is pre-heated.
  • the primary heating source can be either a gas fired natural draught burner bar or bars, or a hot water or steam heating coil, or an electrical heating element.
  • the tumble drying machines in which air entry to the drying drum is allowed on both sides of a common upstanding formation of drum case and in which the primary heat source is on one side only of this up-stand may have a blanking plate fitted to close off the air way from the side without heat source.
  • the blanking or baffle plate results in increased velocity over the heat source and at the air port left open, which in turn provides a significant improvement in uniformity of temperature throughout the bulk of the air entering the drum 5.
  • This improved uniformity in temperature provides increase of drying work per unit of entering air.
  • this improvement of "work per unit of air” allows equal drying at reduced bulk of entering air. This reduction of total entering air quantity results in a corresponding reduction in the energy needed to raise the air temperature to the set point of the tumble drying machine's control thermostat.
  • the baffle plate is an addition to improve machine performance and results in energy saving.
  • the control device is provided to control the operation cycle of the machine and the control circuit is illustrated in Figure 3.
  • the circuit illustrated is for a coin-operated machine, but could be adapted for other machines.
  • the control device comprises a temperature sensitive device 16 which is preferably a single pole changeover thermo-disc switch.
  • the switch is connected in the electrical circuit by live line part 17.
  • Another live line part 17A, having common commencement point as line 17, is taken through a clock switch 18, operated by a coin feed mechanism (not shown) and connected to a terminal 19 and to the operating coil of a two pole changeover relay 22 of which ultimately all terminals are used.
  • the operating coil of relay 22 has a connection to neutral.
  • a centre changeover contact terminal 20 of relay 22 is connected through a door-operated switch 23 to the motor 7.
  • a connecting line is provided from the door switch 23 to the other centre changeover terminal 24 of relay 22.
  • centre changeover contact 24 is made to fixed contact 25, which in turn is connected through normally closed thermo switches 27-28-29 to gas valve 30.
  • the motor 7 and the gas valve 30 have connections to neutral.
  • the clock switch 18 opens and this de-energises the relay 22. Since switch 16 is closed, the motor 7 still operates, fed along line 17, through switch 16 to terminals 20,21 of relay 22, which is in the de-energised condition, and through door switch 23. Changeover terminal 24 breaks the contact with terminal 25 and contacts the terminal 26 and thus the gas valve or other heat source control 30 is closed to cut off heat source 4.
  • the coin cycle time is reduced to 4/5ths.
  • the over-run time available only after the second or third coin cycle, is approximately three minutes. It will be seen that single coin feeding a tumble drying machine fitted with the control device will not affect the overall drying cycle time, because no over-run can occur until the switch 16 has changed to the "hot" condition and that changeover, in practise, does not occur until the bulk of the drying work has been done.
  • the saving of 1/5th of the machine time available through the coin clock is compensated for by the three minutes of over-run available on the last coin only.
  • the overall drying time remains substantially unchanged, when compared to that for a standard tumble drying machine without press-dry cycle.
  • meters 31, 32 Shown in broken line in Figure 3 are meters 31, 32 which allow monitoring of the time the tumble dryer is actually in work, fed by the electrical circuit through the coin operating mechanism, and separately the time the drum and fan have worked through the thermo disc switch 16 on over-run.
  • Another meter 33 is provided to record the length of time the heat source has been in action. The results from these three recording meters allows complete analysis and record of the energy consumption of the machine. The machine coin take can also be recorded to allow accurate calculation of machine utilisation factors.
  • the thermostat 27 is preferably of rod-type design and is preferably positioned directly in the exhaust air path after the exhaust air has left the fan 6, but before it enters the heat exchanger. If the air temperature reaches a predetermined high value, the thermostat 27 operates to interrupt electric supply to both switches 28 and 29, close the gas valve 30 and shut off heat source 4.
  • Control and limit thermostats on standard tumble drying machines are very slow in action and have very high differential characteristics. These two weaknesses individually or in combination, allow excessive temperature over-run when the machines work on light work loads, or when the work load is an easy-dry material, such as nylon. Light, easy-dry materials such as nylon, are sensitive to excessive heat and can be burned or scorched in tumble drying machines with excessive temperature over-run.
  • the additional rod type high temperature limit thermostat 27 reduces the risk of burning the work load. Also, because it is positioned in an easily accessible position and because the thermostat design allows adjustment of the "set point", this limit thermostat can be checked for operation and function in a very shorttime and with great ease. Because checking of this control is so simple and can be carried out without special equipment, in a very short time, it is practical and possible to make this checking operation part of the recommended routine preventive maintenance applied to tumble drying machines.
  • thermostat 27 makes the tumble drying machines less of a fire risk generally, and less likely to destroy or damage some work loads.
  • control device and heat exchanger could be provided as a unit for attachment to existing machines.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Drying Of Solid Materials (AREA)
EP81304529A 1980-10-01 1981-09-30 Séchoir à tambour rotatif Withdrawn EP0049170A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8031573 1980-10-01
GB8031573A GB2088032A (en) 1980-10-01 1980-10-01 Tumble drying machines

Publications (2)

Publication Number Publication Date
EP0049170A2 true EP0049170A2 (fr) 1982-04-07
EP0049170A3 EP0049170A3 (fr) 1982-06-02

Family

ID=10516395

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81304529A Withdrawn EP0049170A3 (fr) 1980-10-01 1981-09-30 Séchoir à tambour rotatif

Country Status (2)

Country Link
EP (1) EP0049170A3 (fr)
GB (1) GB2088032A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009157698A3 (fr) * 2008-06-27 2010-03-25 주식회사 대우일렉트로닉스 Procédé de commande de la soupape à gaz d'un séchoir
US9080283B2 (en) 2011-10-06 2015-07-14 Whirlpool Corporation Method to control a drying cycle of a laundry treating appliance
US9695544B2 (en) 2012-04-02 2017-07-04 Electrolux Home Products Corporation, N.V. Dryer with air recirculation/heat exchange subassembly
EP3561174A1 (fr) * 2018-04-25 2019-10-30 Technisch Bureau Reinders B.V. Installation et procédé de séchage de linge

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH078691A (ja) * 1993-06-24 1995-01-13 Toshiba Corp 衣類乾燥機

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3859735A (en) * 1974-01-23 1975-01-14 Jr Herman E Katterjohn Dryer preheater
US3882613A (en) * 1974-05-20 1975-05-13 Joseph M Wilson Clothes dryer
GB1470163A (en) * 1974-06-07 1977-04-14 Ti Domestic Appliances Ltd Tumbler dryers
US3959892A (en) * 1974-08-01 1976-06-01 A.M. Industries Heated air recycle arrangement
US3969070A (en) * 1975-02-12 1976-07-13 Mcgraw-Edison Company Clothes dryer with heat reclaimer
US4065253A (en) * 1976-08-20 1977-12-27 W. M. Cissell Manufacturing Company Laundry dryer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009157698A3 (fr) * 2008-06-27 2010-03-25 주식회사 대우일렉트로닉스 Procédé de commande de la soupape à gaz d'un séchoir
CN102066648B (zh) * 2008-06-27 2012-10-03 大宇电子株式会社 烘干机的气阀控制方法
US9080283B2 (en) 2011-10-06 2015-07-14 Whirlpool Corporation Method to control a drying cycle of a laundry treating appliance
US9695544B2 (en) 2012-04-02 2017-07-04 Electrolux Home Products Corporation, N.V. Dryer with air recirculation/heat exchange subassembly
EP3561174A1 (fr) * 2018-04-25 2019-10-30 Technisch Bureau Reinders B.V. Installation et procédé de séchage de linge
NL2020825B1 (nl) * 2018-04-25 2019-11-05 Technisch Bureau Reinders B V Installatie en werkwijze voor het drogen van wasgoed

Also Published As

Publication number Publication date
EP0049170A3 (fr) 1982-06-02
GB2088032A (en) 1982-06-03

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