WO2011048165A1 - Air heating passage and fabric drying machine including the passage - Google Patents

Air heating passage and fabric drying machine including the passage Download PDF

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Publication number
WO2011048165A1
WO2011048165A1 PCT/EP2010/065838 EP2010065838W WO2011048165A1 WO 2011048165 A1 WO2011048165 A1 WO 2011048165A1 EP 2010065838 W EP2010065838 W EP 2010065838W WO 2011048165 A1 WO2011048165 A1 WO 2011048165A1
Authority
WO
WIPO (PCT)
Prior art keywords
duct
air
passage
reflecting surface
heating
Prior art date
Application number
PCT/EP2010/065838
Other languages
French (fr)
Inventor
Jihao Li
Yanglei Zhu
Original Assignee
BSH Bosch und Siemens Hausgeräte GmbH
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 BSH Bosch und Siemens Hausgeräte GmbH filed Critical BSH Bosch und Siemens Hausgeräte GmbH
Publication of WO2011048165A1 publication Critical patent/WO2011048165A1/en

Links

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 
    • D06F58/26—Heating arrangements, e.g. gas heating equipment

Definitions

  • the present invention relates to an air heating passage capable of reducing outward diffusion of heat sources, and further to a fabric drying machine having the air heating passage.
  • a common one among various fabric drying machines includes an air heating passage, which heats air and then delivers the heated air into a drum for containing fabric connected thereto.
  • the heated air contacts wet fabric in the drum and takes away a part of moisture from the fabric, and enters a condensation device connected to the drum also.
  • the moisture in the air is separated from the air in the condensation device by condensing the moisture to liquid and stripping the liquid from the air.
  • the air without the moisture reenters the air heating passage driven by a fan, so the fabric in the drum is gradually dried through the repeated circulation.
  • the air heating passage generally includes a duct which allows the air to pass therethrough and a heating device mounted within the duct for heating the air passing through the duct.
  • the heating device generates a large quantity of heat during work, one portion of which heats the air and the other portion of which diffuses outward through the duct wall, resulting in heat loss, so that work efficiency of the heating device is limited.
  • An important way to effect the heat loss is that heat on the heating device is emitted onto the duct wall through heat radiation, a portion of which is absorbed by the duct wall and thereafter diffuses to surroundings through the duct wall.
  • a known approach is to mount a reflecting plate on the inner wall of the duct additionally, so as to reflect the radiated heat back into the duct and heat the air therein.
  • a volume of the duct needs to be increased, so influence compactness of the entire fabric drying machine is affected.
  • the material cost and mounting cost are increased.
  • An objective of the present invention is to provide an improved air heating passage, so as to solve the problems in the prior art.
  • the duct in the air heating passage including a duct which allows air to pass therethrough and a heating device mounted within the duct for heating the air passing through the duct, the duct includes a wall on which an inner surface is formed, and at least a portion of the inner surface is a smooth reflecting surface.
  • the smooth reflecting surface can reflect radiated heat to a great extent, so as to reduce heat loss. Meanwhile, because the reflecting surface is directly formed on the duct wall without mounting additional components, space and component costs are saved, and the production process is also improved.
  • the smooth reflecting surface is mirror finished. Such reflecting surface has a very good reflecting effect.
  • the smooth reflecting surface covers an area at which the heating device is located. Then, a great portion of the radiated heat generated by the heating device can be reflected by the reflecting surface.
  • the smooth reflecting surface encloses the heating device. Then, the radiated heat is repetitively reflected between the reflecting surfaces, so as to heat the air therein, and reduce a ratio that the heat is absorbed and diffused through the duct.
  • the smooth reflecting surfaces are symmetrically disposed relative to the heating device.
  • Another purpose of the present invention is to provide a fabric drying machine having an improved air heating passage.
  • the fabric drying machine includes a rotatable drum used for containing fabric, and an air heating passage which is operable to heat air and deliver the heated air into the drum.
  • the air heating passage includes a duct which allows air to pass therethrough and a heating device mounted within the duct for heating the air passing through the duct.
  • the duct includes a wall on which an inner surface is formed, and at least a portion of the inner surface is a smooth reflecting surface.
  • the smooth reflecting surface can reflect radiated heat to a great extent, so as to reduce heat loss and increase drying efficiency. Meanwhile, because the reflecting surface is directly formed on the duct wall without mounting additional components, space and costs for additional components are saved, the machine becomes more compact, and the production process is also improved.
  • FIG. 1 a schematic partial view of a fabric drying machine
  • FIG. 2 an exploded view of an air heating passage; and FIG. 3, a cross-sectional view of the air heating passage.
  • the fabric drying machine 10 includes a drum 2 for accommodating fabric to be dried and capable of rotation movement, and an outer barrel 4 containing a drum 2 and is in spatial communication with the drum 2.
  • the outer barrel 4 is connected to a condensation device 6, a blast device 8, and an air heating passage 12 in sequence, and an exit end 14 of the air heating passage 12 is subsequently connected to the outer barrel 4, so as to form a circulation duct 16, which enables circulation of air therein.
  • the air heating passage 12 heats the air and delivers the heated air into the outer barrel 4.
  • the heated air subsequently enters the drum 2 through the outer barrel 4, contacts the wet fabric in the drum 2 to take away partial moisture, and enters the condensation device 6 through the outer barrel 4.
  • the condensation device 6 the moisture in the air is separated from the air, while the air with the moisture separated re-enters the air heating passage 12 driven by the blast device 8, so as to begin next circulation and gradually dry the fabric in the drum 2 thereby.
  • the air heating passage 12 includes a duct 18 which allows air to pass therethrough and a heating device 20 mounted within the duct 18 for heating the air passing through the duct 18.
  • the duct 18 is formed by connecting a base 22 and an upper lid 24, and encloses the heating device 20 therein.
  • the base 22 and the upper lid 24 have walls 26 and 28 respectively, which are connected to a wall 30 forming the duct 18.
  • the wall 26 of the base 22 and the wall 28 of the upper lid 24 respectively have inner surfaces 23 and 25 facing the heating device 20.
  • the base 22 and the upper lid 24 are made of certain suitable and more universal material, for example, aluminium.
  • the inner surfaces 23 and 25 are mirror finished to form smooth reflecting surfaces 27 and 29 completely or partially.
  • the mirror finishing mentioned here can be polishing, and can also be other suitable manners such as electroplating.
  • the smooth reflecting surfaces 27 and 29 can reflect radiated heat to a great extent, and reduce heat absorption of the wall 30, so as to reduce heat loss. Meanwhile, because the reflecting surfaces 27 and 29 are directly formed on the wall 30 of the duct 18 without mounting additional components, the space is saved, and the production process and cost are also saved.
  • the smooth reflecting surfaces 27 and 29 cover an area at which the heating device 20 is located, so that a great portion of the heat radiated by the heating device 20 can be reflected.
  • the smooth reflecting surfaces 27 and 29 are symmetrically disposed relative to the heating device 20. Then, the heat is repetitively reflected between the reflecting surfaces 27 and 29, so as to heat the air therein and reduce a ratio that the heat is absorbed and diffused through the duct 30. Further, the smooth reflecting surfaces 27 and 29 are optimally disposed around the heating device 20.
  • the reflecting surfaces 27 and 29 disposed around the heating device 20 can enable circulation and reflection of the radiated heat within the duct 18, and reduce a ratio that the heat is absorbed by the duct wall 30, thus reducing the heat loss.

Abstract

The invention relates to an air heating passage 12 which includes a duct 18 that allows air to pass therethrough and a heating device 20 mounted within the duct 18 for heating the air passing through the duct 18. The duct 18 includes a wall 30 on which an inner surface 23, 25 is formed, wherein at least a portion of the inner surface 23, 25 is a smooth reflecting surface 27, 29. The smooth reflecting surface 27, 29 can reflect radiated heat to a great extent, so as to reduce heat loss. According to the invention, a fabric drying machine includes a rotatable drum 2 used for containing fabric, and further includes the air heating passage 12 as detailed above which is operable to heat air and deliver the heated air into the drum 2.

Description

AIR HEATING PASSAGE AND FABRIC DRYING MACHINE
INCLUDING THE PASSAGE
The present invention relates to an air heating passage capable of reducing outward diffusion of heat sources, and further to a fabric drying machine having the air heating passage.
A common one among various fabric drying machines includes an air heating passage, which heats air and then delivers the heated air into a drum for containing fabric connected thereto. The heated air contacts wet fabric in the drum and takes away a part of moisture from the fabric, and enters a condensation device connected to the drum also. The moisture in the air is separated from the air in the condensation device by condensing the moisture to liquid and stripping the liquid from the air. The air without the moisture reenters the air heating passage driven by a fan, so the fabric in the drum is gradually dried through the repeated circulation.
The air heating passage generally includes a duct which allows the air to pass therethrough and a heating device mounted within the duct for heating the air passing through the duct. The heating device generates a large quantity of heat during work, one portion of which heats the air and the other portion of which diffuses outward through the duct wall, resulting in heat loss, so that work efficiency of the heating device is limited. An important way to effect the heat loss is that heat on the heating device is emitted onto the duct wall through heat radiation, a portion of which is absorbed by the duct wall and thereafter diffuses to surroundings through the duct wall.
In order to reduce the heat loss from the heat radiation of the heating device, a known approach is to mount a reflecting plate on the inner wall of the duct additionally, so as to reflect the radiated heat back into the duct and heat the air therein. However, in order to mount the reflecting plate in the duct, inevitably a volume of the duct needs to be increased, so influence compactness of the entire fabric drying machine is affected. Further, for this structure, as components are added, the material cost and mounting cost are increased.
An objective of the present invention is to provide an improved air heating passage, so as to solve the problems in the prior art.
For this and other purposes, in accordance with the invention, in the air heating passage including a duct which allows air to pass therethrough and a heating device mounted within the duct for heating the air passing through the duct, the duct includes a wall on which an inner surface is formed, and at least a portion of the inner surface is a smooth reflecting surface. The smooth reflecting surface can reflect radiated heat to a great extent, so as to reduce heat loss. Meanwhile, because the reflecting surface is directly formed on the duct wall without mounting additional components, space and component costs are saved, and the production process is also improved.
As a preferred embodiment of an aspect of the present invention, the smooth reflecting surface is mirror finished. Such reflecting surface has a very good reflecting effect.
As a preferred embodiment of another aspect of the present invention, the smooth reflecting surface covers an area at which the heating device is located. Then, a great portion of the radiated heat generated by the heating device can be reflected by the reflecting surface. As a preferred embodiment of another aspect of the present invention, the smooth reflecting surface encloses the heating device. Then, the radiated heat is repetitively reflected between the reflecting surfaces, so as to heat the air therein, and reduce a ratio that the heat is absorbed and diffused through the duct.
As a preferred embodiment of another aspect of the present invention, the smooth reflecting surfaces are symmetrically disposed relative to the heating device.
Another purpose of the present invention is to provide a fabric drying machine having an improved air heating passage.
The fabric drying machine according to the present invention includes a rotatable drum used for containing fabric, and an air heating passage which is operable to heat air and deliver the heated air into the drum. The air heating passage includes a duct which allows air to pass therethrough and a heating device mounted within the duct for heating the air passing through the duct. The duct includes a wall on which an inner surface is formed, and at least a portion of the inner surface is a smooth reflecting surface. The smooth reflecting surface can reflect radiated heat to a great extent, so as to reduce heat loss and increase drying efficiency. Meanwhile, because the reflecting surface is directly formed on the duct wall without mounting additional components, space and costs for additional components are saved, the machine becomes more compact, and the production process is also improved. The present invention will become more fully understood from the detailed description of the attached drawing given hereinbelow. This description is provided for illustration only, and thus not limitative of the present invention. The drawing comprises:
FIG. 1 , a schematic partial view of a fabric drying machine;
FIG. 2, an exploded view of an air heating passage; and FIG. 3, a cross-sectional view of the air heating passage.
As shown in FIG. 1 , the fabric drying machine 10 includes a drum 2 for accommodating fabric to be dried and capable of rotation movement, and an outer barrel 4 containing a drum 2 and is in spatial communication with the drum 2. The outer barrel 4 is connected to a condensation device 6, a blast device 8, and an air heating passage 12 in sequence, and an exit end 14 of the air heating passage 12 is subsequently connected to the outer barrel 4, so as to form a circulation duct 16, which enables circulation of air therein.
In a procedure that the fabric drying machine 10 dries the fabric, the air heating passage 12 heats the air and delivers the heated air into the outer barrel 4. The heated air subsequently enters the drum 2 through the outer barrel 4, contacts the wet fabric in the drum 2 to take away partial moisture, and enters the condensation device 6 through the outer barrel 4. In the condensation device 6, the moisture in the air is separated from the air, while the air with the moisture separated re-enters the air heating passage 12 driven by the blast device 8, so as to begin next circulation and gradually dry the fabric in the drum 2 thereby. As shown in FIGs. 1 and 2, the air heating passage 12 includes a duct 18 which allows air to pass therethrough and a heating device 20 mounted within the duct 18 for heating the air passing through the duct 18. The duct 18 is formed by connecting a base 22 and an upper lid 24, and encloses the heating device 20 therein. As shown in FIG. 3, the base 22 and the upper lid 24 have walls 26 and 28 respectively, which are connected to a wall 30 forming the duct 18. The wall 26 of the base 22 and the wall 28 of the upper lid 24 respectively have inner surfaces 23 and 25 facing the heating device 20. The base 22 and the upper lid 24 are made of certain suitable and more universal material, for example, aluminium. The inner surfaces 23 and 25 are mirror finished to form smooth reflecting surfaces 27 and 29 completely or partially. The mirror finishing mentioned here can be polishing, and can also be other suitable manners such as electroplating. Then, the smooth reflecting surfaces 27 and 29 can reflect radiated heat to a great extent, and reduce heat absorption of the wall 30, so as to reduce heat loss. Meanwhile, because the reflecting surfaces 27 and 29 are directly formed on the wall 30 of the duct 18 without mounting additional components, the space is saved, and the production process and cost are also saved.
Preferably, the smooth reflecting surfaces 27 and 29 cover an area at which the heating device 20 is located, so that a great portion of the heat radiated by the heating device 20 can be reflected. Preferably, the smooth reflecting surfaces 27 and 29 are symmetrically disposed relative to the heating device 20. Then, the heat is repetitively reflected between the reflecting surfaces 27 and 29, so as to heat the air therein and reduce a ratio that the heat is absorbed and diffused through the duct 30. Further, the smooth reflecting surfaces 27 and 29 are optimally disposed around the heating device 20. Particularly, in other embodiments, when the duct 18 has other sectional shapes or construction characters, the reflecting surfaces 27 and 29 disposed around the heating device 20 can enable circulation and reflection of the radiated heat within the duct 18, and reduce a ratio that the heat is absorbed by the duct wall 30, thus reducing the heat loss.
Various specific embodiments described in the foregoing and shown in accompanying drawings are only used for illustrating the present invention, and are not regarded as the entirety of the present invention. Within the scope of the basic technical thoughts of the present invention, any types of modifications for the present invention made by persons of ordinary skills in the art fall within the protection scope of the present invention.

Claims

1. An air heating passage (12), comprising a duct (18) which allows air passing therethrough and a heating device (20) mounted within the duct (18) for heating the air passes through the duct (18), wherein the duct (18) comprises a wall (30) which has an inner surface (23, 25), characterized in that a smooth reflecting surface (27, 29) is formed on at least a portion of the inner surface (23, 25).
2. The air heating passage (12 according to claim 1 , characterized in that the smooth reflecting surface (27, 29) is mirror finished.
3. The air heating passage (12 according to one of claims 1 and 2, characterized in that the smooth reflecting surface (27, 29) covers the heating device (20).
4. The air heating passage (12) according to claim 3, characterized in that the smooth reflecting surface (27, 29) encloses the heating device (20).
5. An air heating passage (12) according to claim 3, characterized in that, the smooth reflecting surface (27, 29) is symmetrical about the heating device (20).
6. A fabric drying machine, comprising a rotatable drum (2) used for containing fabric, and an air heating passage (12) which is operable to heat air and deliver the heated air into the drum (2), wherein the air heating passage (12) comprises a duct (18) which allows air passing therethrough and a heating device (20) mounted within the duct (18) for heating the air passes through the duct (18), wherein the duct (18) comprises a wall (30) which having an inner surface (23, 25), characterized in that a smooth reflecting surface (27, 29) is formed on at least a portion of the inner surface (23, 25).
7. The fabric drying machine according to claim 6, characterized in that the smooth reflecting surface (27, 29) is mirror finished.
8. The fabric drying machine according to one of claims 6 and 7, characterized in that the smooth reflecting surface (27, 29) covers the heating device (20).
9. The fabric drying machine according to claim 8, characterized in that the smooth reflecting surface (27, 29) encloses the heating device (20).
10. The fabric drying machine according to claim 6 or 7, characterized in that the duct (18) comprises a first duct element (22) and a second duct element (24) which connected together and enclose the heating device (20) therebetween, wherein the first duct element (22) and the second duct element (24) respectively comprises a smooth reflecting surface (27, 29).
PCT/EP2010/065838 2009-10-22 2010-10-21 Air heating passage and fabric drying machine including the passage WO2011048165A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2009102089150A CN102042677A (en) 2009-10-22 2009-10-22 Air heating channel and fabric drying equipment with same
CN200910208915.0 2009-10-22

Publications (1)

Publication Number Publication Date
WO2011048165A1 true WO2011048165A1 (en) 2011-04-28

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Application Number Title Priority Date Filing Date
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WO (1) WO2011048165A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105088715A (en) * 2014-04-15 2015-11-25 无锡小天鹅股份有限公司 Clothes dryer and heater used for same
DE102019204424A1 (en) * 2019-03-29 2020-10-01 Polytec Plastics Germany Gmbh & Co. Kg Tumble dryer heater

Citations (2)

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US6223452B1 (en) * 1999-11-11 2001-05-01 Maytag Corporation Clothes dryer with emissive coating
WO2007021134A2 (en) * 2005-08-19 2007-02-22 Lg Electronics, Inc. Drying duct assembly and washing machine having the same

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Publication number Priority date Publication date Assignee Title
CN2616569Y (en) * 2003-05-13 2004-05-19 吴祖禹 Multifunctional rapid clothing drying cabinet
EP1616990B1 (en) * 2004-07-13 2017-08-30 LG Electronics, Inc. Washing machine with steam generation apparatus
KR100597742B1 (en) * 2004-07-20 2006-07-07 삼성전자주식회사 Washing machine
CN201125334Y (en) * 2007-10-16 2008-10-01 苏州三星电子有限公司 Improved drum washing machine drying tunnel structure

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6223452B1 (en) * 1999-11-11 2001-05-01 Maytag Corporation Clothes dryer with emissive coating
WO2007021134A2 (en) * 2005-08-19 2007-02-22 Lg Electronics, Inc. Drying duct assembly and washing machine having the same

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