EP4116482A1 - Séchoir à pompe à chaleur comportant un module d'appareil chauffant - Google Patents

Séchoir à pompe à chaleur comportant un module d'appareil chauffant Download PDF

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Publication number
EP4116482A1
EP4116482A1 EP22183683.6A EP22183683A EP4116482A1 EP 4116482 A1 EP4116482 A1 EP 4116482A1 EP 22183683 A EP22183683 A EP 22183683A EP 4116482 A1 EP4116482 A1 EP 4116482A1
Authority
EP
European Patent Office
Prior art keywords
heater
heat pump
drum
pump dryer
fin
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.)
Pending
Application number
EP22183683.6A
Other languages
German (de)
English (en)
Inventor
Erdinc DURAK
Mehmet Inan
Selcuk KARAGOZ
Onur ERCAN
Cem YONAR
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.)
Arcelik AS
Original Assignee
Arcelik AS
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 Arcelik AS filed Critical Arcelik AS
Publication of EP4116482A1 publication Critical patent/EP4116482A1/fr
Pending 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
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/206—Heat pump arrangements
    • 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

  • the present invention relates to a heat pump dryer comprising a heater group with improved safety.
  • R134a is generally used as a refrigerant in hybrid dryers. However, instead of this gas, which has a very high GWP (global warming potential), it is encouraged to use more environmentally-friendly gases, which is important in terms of sustainability. On the other hand, the biggest obstacle with gases having low GWP values is the high flammability value of the gases, which requires the need for taking precautions related to combustion reliability.
  • R290 gas is a gas with low GWP and high flammability. The experimental and regulatory flashover temperature of R290 gas is accepted as 350°C. The wire surface temperatures of the open wire electric heater used in the state of the art reach 700°C and cause a great risk in terms of product safety.
  • the operating condition that creates the riskiest product reliability problem is the absence of drum and fan movement. If there is no air flow over the heater when the drum is full of laundry and the fan and drum are not working, the temperatures on the heater surface rise very quickly. The temperature of open wire heaters rises up to 700-800°C and heats the area where the safety members are positioned quickly by radiation, thus keeping the system safe. In products where R290 gas is used, the heater surface must not exceed 350°C under any circumstances, and this cannot be achieved with the existing safety member positions. Therefore, a new heater and safety member design is needed for refrigerants with a relatively low flashover temperature such as R290 gas, and the state of the art does not offer a solution to this technical problem.
  • the aim of the present invention is the realization of a dryer with improved safety of usage and product performance in dryers wherein environmentally-friendly refrigerant gases are used.
  • the heat pump dryer realized in order to attain the aim of the present invention, explicated in the claims, comprises a body; a drum which is provided in the body and wherein the laundry is loaded; a fan which is provided in the body and which provides the air flow into the drum; a heat pump which is positioned next to the fan; and a heater group disposed on the drum wall and having at least one heater wire over which the process air leaving the fan passes, a heater support member and a heater safety member.
  • an air flow path is followed, wherein the process air leaving the fan passes over the heater group to reach the drum, which is mostly used as open wire, and is sent back to the fan after the condensation and evaporation processes in the heat pump.
  • the heater safety member generally operates like a heat sensor and serves as a mechanical switch according to the surface / ambient temperature.
  • the dryer comprises the heater group further having a heater body which is designed as a metal tube and wherein the heater wires therein are surrounded by resistance powder, at least one heater fin which is disposed at the side of the heater body and provides the heat transfer and the air passage, and a heater fin gap on the heater fin wherein at least one safety member is disposed.
  • product and user safety is provided by means of the safety members which keep the temperature of the heater body, of the heater fin and of the surface under a certain threshold.
  • the heat pump dryer comprises the safety member which is a fuse and / or thermistor fixed by being in direct contact with the surface of the heater fin gap.
  • the safety member which is a fuse and / or thermistor fixed by being in direct contact with the surface of the heater fin gap.
  • two or more fuses are fixed preferably into the heater fin by rivets so as to directly detect the surface temperature.
  • a temperature detection range of 225-250°C gives the best results according to the experiments.
  • metal NTCs are frequently used as thermistors.
  • a safety member which is cost-efficient and easy-to-adjust is used.
  • the heat pump dryer comprises the heater fin gap which is designed flat so as to cover at most one sixth of the total surface area of the heater fin. Otherwise, deviations occur in the heat data obtained and the safety members cannot receive correct data.
  • the heat pump dryer comprises at least one heater fin extension which is formed by means of one or more than one cut-out on the heater fins and which bends upwards so as to make a right angle with the horizontal axis of the heater body.
  • the highest air passage performance is provided by carrying out the design at an angle of 90 degrees so as to allow the passage of the coming process air.
  • the heat pump dryer comprises a protective member which is disposed on the safety member and which provides protection against environmental factors by means of a non-conductive material.
  • a protective member which is disposed on the safety member and which provides protection against environmental factors by means of a non-conductive material.
  • the heat pump dryer comprises a support member whereon the heater group is positioned and which guides the process air towards the drum.
  • the support member which is preferably positioned on the rear wall of the drum, the process air is guided into the drum.
  • the heat pump dryer comprises a fixing member which enables the heater group to be fixed at both sides.
  • the heater group and the support member are prevented from generating noise or vibration.
  • the heat pump dryer (1) comprises a body (2); a drum (3) which is provided in the body (2) and wherein the laundry is loaded; a fan (4) which is provided in the body (2) and which provides the air flow into the drum (3); a heat pump (5) which is positioned next to the fan (4); and a heater group (9) disposed on the drum (3) wall and having at least one heater wire (6) over which the process air leaving the fan (4) passes, a heater support member (7) and a safety member (8).
  • an air flow path is followed, wherein the process air leaving the fan (4) passes over the heater group (9) to reach the drum (3), which is mostly used as open wire, and is sent back to the fan (4) after the condensation and evaporation processes in the heat pump (5).
  • the safety member (8) generally operates like a heat sensor and serves as a mechanical switch according to the surface / ambient temperature.
  • the dryer (1) comprises the heater group (9) further having a heater body (10) which is designed as a metal tube and wherein the heater wires (6) therein are surrounded by resistance powder, at least one heater fin (11) which is disposed at the side of the heater body (10) and provides the heat transfer and the air passage, and a heater fin gap (12) on the heater fin (11) wherein at least one safety member (8) is disposed.
  • a heater body (10) which is designed as a metal tube and wherein the heater wires (6) therein are surrounded by resistance powder
  • at least one heater fin (11) which is disposed at the side of the heater body (10) and provides the heat transfer and the air passage
  • Magnesium oxide is generally preferred as resistance powder. Sudden heating is prevented by means of tubular heaters compared to open wire heaters, and critical temperatures determined by the manufacturer can be detected at much lower levels by means of the safety members (8) disposed on the surface of the
  • the heater fins (11) positioned symmetrically on both sides of the heater body (10) are provided in pairs.
  • the cross-section of the heater group (9) can be designed in the form of X, Y or I and in a wavy form.
  • the highly flammable refrigerant inside the dryer (1) which ignites at 350°C, operates in safe temperature conditions.
  • the heat pump dryer (1) comprises the safety member (8) which is a fuse and / or thermistor fixed by being in direct contact with the surface of the heater fin gap (12).
  • the safety member (8) which is a fuse and / or thermistor fixed by being in direct contact with the surface of the heater fin gap (12).
  • two or more fuses are fixed preferably into the heater fin (11) by rivets so as to directly detect the surface temperature.
  • a temperature detection range of 225-250°C gives the best results according to the experiments.
  • metal NTCs are frequently used as thermistors.
  • the NTC and the fuse can be mounted at the same point. Product safety is maximized by using both the thermal fuses and the heater fin (11) whereon the NTC is disposed.
  • the heat pump dryer (1) comprises the heater fin gap (12) which is designed flat so as to cover at most one sixth of the total surface area of the heater fin (11).
  • both air permeability and heat data collection problems occur in the heater fins (11) designed by exceeding said ratio, resulting in an inefficient heater group (9).
  • the heat pump dryer (1) comprises at least one heater fin extension (14) which is formed by means of one or more than one cut-out on the heater fins (11) and which bends upwards so as to make a right angle with the horizontal axis of the heater body (10).
  • the heater fin extension (14) is formed by means of one or more than one cut-out on the heater fins (11) and which bends upwards so as to make a right angle with the horizontal axis of the heater body (10).
  • a molding machine preferably more than one cut-out is formed on the heater fin (11) and the parts formed in the cut-out are bent perpendicular to the heater body (10) such that the heater fin extensions (14) are obtained.
  • the highest air passage performance is provided by carrying out the design at an angle of 90 degrees so as to allow the passage of the coming process air.
  • the heat pump dryer (1) comprises a protective member (13) which is disposed on the safety member (8) and which provides protection against environmental factors by means of a non-conductive material. A large amount of fluff and fiber is generated in the dryer (1) due to the operation thereof. By insulating said fluffs and fibers, the risk of short-circuit caused by fluff and fibers for safety members such as fuses is prevented.
  • the heat pump dryer (1) comprises a support member (15) whereon the heater group (9) is positioned and which guides the process air towards the drum (3).
  • the process air which is heated by passing over the heater group (9), is guided into the drum (3) by means of the support member (15) which is generally positioned on the rear wall of the drum (3).
  • the heat pump dryer (1) comprises a fixing member (16) which enables the heater group (9) to be fixed at both sides.
  • the heater group (9) and the support member (15) are prevented from generating noise or vibration due to the air flow or the movement of the drum (3).
  • a riveted grounding sheet can be added on the heater group (9) to ensure electrical safety as well as thermal safety. Moreover, more sensitive results are obtained by positioning the safety members (8) adjacent to the starting point of the heater fin extensions (14) for a more accurate temperature reading.
  • the tubular heater group (9) and the safety member (8) By means of the positioning of the tubular heater group (9) and the safety member (8), the highest level of product safety is provided for heat pump dryers (1) suitable for working with environmentally-friendly gases or refrigerants.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
EP22183683.6A 2021-07-08 2022-07-07 Séchoir à pompe à chaleur comportant un module d'appareil chauffant Pending EP4116482A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TR202111143 2021-07-08

Publications (1)

Publication Number Publication Date
EP4116482A1 true EP4116482A1 (fr) 2023-01-11

Family

ID=82403870

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22183683.6A Pending EP4116482A1 (fr) 2021-07-08 2022-07-07 Séchoir à pompe à chaleur comportant un module d'appareil chauffant

Country Status (1)

Country Link
EP (1) EP4116482A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3340313A1 (de) * 1983-11-08 1985-05-15 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Haushalt-waeschetrockner
WO2009074455A1 (fr) * 2007-12-11 2009-06-18 BSH Bosch und Siemens Hausgeräte GmbH Appareil ménager comprenant un premier conduit d'air et une pompe à chaleur
WO2011151213A2 (fr) 2010-06-04 2011-12-08 Arcelik Anonim Sirketi Sèche-linge à pompe à chaleur thermoélectrique permettant d'économiser de l'énergie
DE102016110871A1 (de) * 2016-05-19 2017-11-23 Miele & Cie. Kg Wäschetrockner
WO2020100085A1 (fr) 2018-11-16 2020-05-22 I.R.C.A. S.P.A. Industria Resistenze Corazzate E Affini Dispositif de chauffage électrique pour appareil électroménager

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3340313A1 (de) * 1983-11-08 1985-05-15 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Haushalt-waeschetrockner
WO2009074455A1 (fr) * 2007-12-11 2009-06-18 BSH Bosch und Siemens Hausgeräte GmbH Appareil ménager comprenant un premier conduit d'air et une pompe à chaleur
WO2011151213A2 (fr) 2010-06-04 2011-12-08 Arcelik Anonim Sirketi Sèche-linge à pompe à chaleur thermoélectrique permettant d'économiser de l'énergie
DE102016110871A1 (de) * 2016-05-19 2017-11-23 Miele & Cie. Kg Wäschetrockner
WO2020100085A1 (fr) 2018-11-16 2020-05-22 I.R.C.A. S.P.A. Industria Resistenze Corazzate E Affini Dispositif de chauffage électrique pour appareil électroménager

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