EP1984553B1 - Domestic clothes drier with twin fan - Google Patents
Domestic clothes drier with twin fan Download PDFInfo
- Publication number
- EP1984553B1 EP1984553B1 EP07711398.3A EP07711398A EP1984553B1 EP 1984553 B1 EP1984553 B1 EP 1984553B1 EP 07711398 A EP07711398 A EP 07711398A EP 1984553 B1 EP1984553 B1 EP 1984553B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- vanes
- fan
- machine according
- air
- flow
- 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.)
- Not-in-force
Links
Images
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
- D06F58/24—Condensing 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
- D06F58/02—Domestic laundry dryers having dryer drums rotating about a horizontal axis
- D06F58/04—Details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/16—Centrifugal pumps for displacing without appreciable compression
- F04D17/165—Axial entry and discharge
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
- F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
- F04D29/283—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis rotors of the squirrel-cage type
-
- 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 an improved type of clothes drying machine, preferably of the domestic kind, which operates in a particularly efficient manner.
- Clothes drying machines which operate using different methods are known, in particular those operating by means of condensation of a flow of hot air which is blown into the drum and which removes the moisture contained in the clothes or by discharging externally said flow of moist hot air.
- these machines are made by installing a heating and ventilation system, normally a ventilator consisting of a fan and associated electric motor, which draws the air from the outside and by means of suitable ducts heats it and blows it into the drum containing the clothes to be dried.
- a ventilator consisting of a fan and associated electric motor, which draws the air from the outside and by means of suitable ducts heats it and blows it into the drum containing the clothes to be dried.
- a heating element is installed inside said duct and, suitably activated, heats the air which passes over it and is blown in by said ventilator, so that hot air is introduced into the drum so as to cause evaporation of the moisture contained in the clothes.
- the hot air After being introduced into the drum, the hot air causes evaporation of the moisture contained in the clothes and therefore is practically saturated or completely saturated with it; said air is then propelled by said ventilator, creating a continuous flow which is directed into a suitable condensation device, usually consisting of a heat exchanger which is passed through, along the so-called “hot” path, by said moist hot air flow and, along the so-called “cold” path, by a substantially continuous flow of air drawn from the environment and introduced back into the environment after passing through said exchanger.
- a suitable condensation device usually consisting of a heat exchanger which is passed through, along the so-called “hot” path, by said moist hot air flow and, along the so-called “cold” path, by a substantially continuous flow of air drawn from the environment and introduced back into the environment after passing through said exchanger.
- said air flow along the "cold" path is also activated and maintained by a ventilator operated by a respective electric motor.
- Said clothes drying machines are fairly simple, low-cost and operationally reliable machines, but, as is well-known, they have the common drawback that they are significantly noisy owing to the air flow which is blown in at a considerable rate inside the suction and discharge ducts.
- a drum 1 for containing the clothes to be dried and has, associated with it, a duct 2 for circulation of the drying air; the latter also passes through a condenser 3 which is able to condense the moisture present in the air passing through it, said condenser being passed through by a "cold" air flow, namely one which is drawn from the environment and conveyed to the said condenser 3 via an associated duct 4.
- Both the ducts 2 and 4 contain inside them two respective fans 5, 6 for actuating the respective drying and cooling air flows.
- One of said fans, or both of them, consist of two sets of vanes which are arranged on the outer surface of a respective cylindrical form, said two cylindrical forms being understood in the non-material sense.
- Said cylindrical forms are moreover coaxial and the radius of a first cylindrical form is smaller than the radius of the second cylindrical form.
- vanes 10, 11, 12 ... of the first set, or outer set are rigidly supported by a wall "P" arranged along a geometric base of the respective cylindrical form, and the supporting structure of said fan is thus formed.
- vanes of the set of inner vanes 20, 21, 22 ... of the second set are likewise supported on said wall "P" such that the vanes of both sets are joined together and can rotate in synchronism.
- the latter in order to avoid damaging vortices on the inner vanes, advantageously have a shape which is not flat but curved, i.e. with the associated concavities C1, C2, C3, etc., directed in the sense of rotation.
- the fan according to the invention is thus formed.
- Fig. 7 shows two graphs illustrating the flowrate of a fan with and without the invention, the graph A showing the pressure and the consumption of a fan without the invention and the graph B showing the corresponding parameters of the same fan to which the set of inner vanes according to the invention has been added.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Detail Structures Of Washing Machines And Dryers (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
- The present invention relates to an improved type of clothes drying machine, preferably of the domestic kind, which operates in a particularly efficient manner.
- In the continuation of the present description reference will be made to a simple clothes drying machine, but it is understood that the above explanation may also be applied in an identical manner to - and therefore is also valid for - a combined washing and drying machine.
- Clothes drying machines which operate using different methods are known, in particular those operating by means of condensation of a flow of hot air which is blown into the drum and which removes the moisture contained in the clothes or by discharging externally said flow of moist hot air.
- Said clothes drying machines are described generally in the European Patent
EP-A-1 475 474 in the name of the same applicant. - However, in order to assist the reader, a short descriptive part of said document is included here.
- As is well-known, these machines are made by installing a heating and ventilation system, normally a ventilator consisting of a fan and associated electric motor, which draws the air from the outside and by means of suitable ducts heats it and blows it into the drum containing the clothes to be dried.
- A heating element is installed inside said duct and, suitably activated, heats the air which passes over it and is blown in by said ventilator, so that hot air is introduced into the drum so as to cause evaporation of the moisture contained in the clothes.
- After being introduced into the drum, the hot air causes evaporation of the moisture contained in the clothes and therefore is practically saturated or completely saturated with it; said air is then propelled by said ventilator, creating a continuous flow which is directed into a suitable condensation device, usually consisting of a heat exchanger which is passed through, along the so-called "hot" path, by said moist hot air flow and, along the so-called "cold" path, by a substantially continuous flow of air drawn from the environment and introduced back into the environment after passing through said exchanger.
- Conventionally, said air flow along the "cold" path is also activated and maintained by a ventilator operated by a respective electric motor.
- Said clothes drying machines are fairly simple, low-cost and operationally reliable machines, but, as is well-known, they have the common drawback that they are significantly noisy owing to the air flow which is blown in at a considerable rate inside the suction and discharge ducts.
- Consequently, the use of these machines is normally limited to certain periods, this making their use less attractive for the average user.
- The most immediate technical solution for achieving the circulation of said two separate air flows is that of using respective ventilators inserted inside the corresponding ducts and operated by respective motors which are controlled independently.
- Obviously said two ventilators use a not insignificant amount of power, owing to, not only mechanical friction factors which, however, are of limited importance, but also and in particular the power which must be used in order to impart to the respective air flows the desired speed, or pressure, at the necessary flowrate.
- It would therefore be desirable, and this is the main object of the present invention, to provide a clothes drying machine of the condensation or externally discharging type, which is provided with fans for drying and if necessary cooling the condenser and is able to offer a normal drying performance, but which is significantly more efficient, without increasing the complexity of the machine, while keeping the production costs low.
- These and other objects which will be described further below are achieved by providing a clothes drying machine according to the claims which follow; the invention will be understood more clearly from the following description, provided solely by way of a non-limiting example with reference to the accompanying drawings, in which:
-
Fig. 1 shows a general schematic diagram of a clothes drying machine provided with a condenser and two fans which are rigidly connected together, according to the prior art; -
Figs. 2 and3 show two perspective views, i.e. a front view and side view, respectively, of a fan for circulating air in a machine according to the invention; -
Fig. 4 shows a front view of the said fan; -
Fig. 5 shows a cross-sectional view through the centre of the said fan; -
Fig. 6 shows a front view of a variant of embodiment of the fan according to the invention; -
Fig. 7 shows, in a same diagram, two separate graphs illustrating the progression of the pressure and electric power consumption of the motor in a clothes drying machine with a fan according to the prior art (graph A) and with a fan which is the same, but equipped with the present invention (graph B), respectively. - With reference to
Fig. 1 , in a clothes drying machine according to a preferred embodiment of the invention, adrum 1 is provided for containing the clothes to be dried and has, associated with it, aduct 2 for circulation of the drying air; the latter also passes through a condenser 3 which is able to condense the moisture present in the air passing through it, said condenser being passed through by a "cold" air flow, namely one which is drawn from the environment and conveyed to the said condenser 3 via an associatedduct 4. - Both the
ducts respective fans 5, 6 for actuating the respective drying and cooling air flows. - One of said fans, or both of them, consist of two sets of vanes which are arranged on the outer surface of a respective cylindrical form, said two cylindrical forms being understood in the non-material sense.
- Said cylindrical forms are moreover coaxial and the radius of a first cylindrical form is smaller than the radius of the second cylindrical form.
- Essentially the two cylindrical forms, and therefore also the two sets of vanes, are inserted inside one another, without touching however, as is clearly illustrated in
Figures 2 to 5 . - The
vanes - Advantageously the vanes of the set of
inner vanes - Still with reference to
Figures 2 ,3 and4 , in order to avoid damaging vortices on the inner vanes, advantageously the latter have a shape which is not flat but curved, i.e. with the associated concavities C1, C2, C3, etc., directed in the sense of rotation. - Moreover and preferably the free ends of the vanes of each set are connected by a respective reinforcing
ring - The fan according to the invention is thus formed.
- The mode of operation of this fan will now be clear: in fact the air which is sucked in by the cavity between the two sets of vanes is forced outside by the outer vanes in accordance with known mechanical principles, while the air sucked inside the inner vanes is naturally blown outwards, i.e. into said cavity, with a certain given speed which is added to the speed imparted by the outer vanes through which it passes immediately afterwards.
- Basically operation similar to that of a twin-stage fan occurs, in which at least part of the air sucked in is subject to the series action of the vanes of the two sets.
- Obviously the flow of said air blown from the inner vanes also assists the movement of the air sucked directly from the outside into said cavity, this favouring the general efficiency of the fan.
- It may also be considered that the air blown out from the set of inner vanes is slightly slowed down by the air sucked in directly from the outside into said cavity; however, the overall effect is an improvement in the efficiency of the fan, as demonstrated by
Fig. 7 , which shows two graphs illustrating the flowrate of a fan with and without the invention, the graph A showing the pressure and the consumption of a fan without the invention and the graph B showing the corresponding parameters of the same fan to which the set of inner vanes according to the invention has been added. - With reference to
Fig. 4 , it has also been observed that in certain embodiments and in certain operating conditions, for example when the fan must operate always in the same direction of rotation, or, as more frequently occurs in a clothes drying machine, in a main direction of rotation, the efficiency of the fan is further increased if the inner vanes are provided with an orientation which is not radial, but inclined at a given angle "i" with respect to the radial plane which passes through the latter, and in particular if said inner vanes are inclined such that, taking as a reference the direction of rotation "S" of the fan, theouter edges inner edges - However, more generally it is possible to envisage fans which are operated in an alternating manner and for identical periods in each direction of rotation; in this case it is obviously advantageous if the vanes of the fan also do not have preferential forms, but on the contrary, as shown by way of example in
Fig. 6 , all the inner vanes are flat and arranged radially.
Claims (6)
- Clothes drying machine or combined clothes washing and drying machine comprising a drum (1) containing the clothes to be dried, at least one first fan (5) able to blow a first flow of drying air through said drum, a condenser (3) inside which said drying air flow is made to pass and an associated cooling air duct (4) which conveys a second flow of fresh air through said condenser (3), said second flow being actuated by a second fan (6) associated with said air duct (4), wherein at least one of said fans (5, 6) is formed by means of a first set of outer vanes (10, 11, 12) and a second set of inner vanes (21, 22, 23) rotating with respect to a common axis (X), wherein the vanes of the first set of vanes are distributed on a first cylindrical form, and wherein the vanes of the second set of vanes are arranged along a second cylindrical form which is different from the first cylindrical form and are arranged inside said first cylindrical form, characterized in that a base of the cylinder which is defined by the first set of vanes is at least partly closed by a wall (P).
- Machine according to Claim 1, characterized in that the vanes of the second set of vanes arranged internally are fixed at one of their ends to said wall (P).
- Machine according to any one of the preceding claims, characterized in that said vanes of said first set are radial with respect to said common axis (X).
- Machine according to Claim 3, characterized in that said vanes of the second set of inner vanes (20, 21, 22) are oriented in a non-radial direction with respect to said common axis and have a given inclination (i) with respect to the respective radial planes passing through them.
- Machine according to Claim 4, characterized in that said given inclination is such that the outer edges (45, 46, 47) of respective inner vanes are situated further forwards in the direction of fan rotation than the respective inner edges (45A, 46A, 47A).
- Machine according to any one of the preceding claims, characterized in that said inner vanes have a concave surface (Cl, C2, C3) directed in the sense of rotation of said fan.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000004U ITPN20060004U1 (en) | 2006-02-15 | 2006-02-15 | DOMESTIC TOWEL DRYER WITH DOUBLE FAN. |
PCT/EP2007/000723 WO2007093274A1 (en) | 2006-02-15 | 2007-01-29 | Domestic clothes drier with twin fan |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1984553A1 EP1984553A1 (en) | 2008-10-29 |
EP1984553B1 true EP1984553B1 (en) | 2013-11-20 |
Family
ID=38066433
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07711398.3A Not-in-force EP1984553B1 (en) | 2006-02-15 | 2007-01-29 | Domestic clothes drier with twin fan |
Country Status (7)
Country | Link |
---|---|
US (1) | US20090071029A1 (en) |
EP (1) | EP1984553B1 (en) |
KR (1) | KR20080094707A (en) |
CN (1) | CN101384766B (en) |
BR (1) | BRPI0707934A2 (en) |
IT (1) | ITPN20060004U1 (en) |
WO (1) | WO2007093274A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7627960B2 (en) * | 2003-06-30 | 2009-12-08 | General Electric Company | Clothes dryer drum projections |
DE102008014305A1 (en) * | 2008-03-14 | 2009-09-17 | BSH Bosch und Siemens Hausgeräte GmbH | Exhaust air dryer with recirculated air and process for its operation |
EP2980304B1 (en) * | 2013-03-28 | 2018-06-27 | Wuxi Little Swan Co. Ltd. | Centrifugal fan and clothes dryer having the same |
CN103225625A (en) * | 2013-03-28 | 2013-07-31 | 无锡小天鹅股份有限公司 | Centrifugal fan and clothes dryer with same |
CN105570342A (en) * | 2016-02-18 | 2016-05-11 | 太仓钰丰机械工程有限公司 | Silicone oil fan clutch with double spiral blades |
CN106678967B (en) * | 2016-12-30 | 2022-04-12 | 广东美的制冷设备有限公司 | Centrifugal wind wheel, combined centrifugal wind wheel and air conditioner |
CN106678968B (en) * | 2016-12-30 | 2022-04-19 | 广东美的制冷设备有限公司 | Centrifugal wind wheel, combined centrifugal wind wheel and air conditioner |
CN113430798B (en) * | 2021-06-26 | 2023-06-30 | 嘉兴劲耀光电科技有限公司 | Electric clothes hanger with fresh air purifying air |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57153996A (en) * | 1981-03-20 | 1982-09-22 | Rokugou Seisakusho:Kk | Impeller for single suction centrifugal type fan |
JPH0798000A (en) * | 1993-09-28 | 1995-04-11 | Takao Kobayashi | Stricture of impeller of multiblade centrifugal blower and manufacture thereof |
US6653755B2 (en) * | 2001-05-30 | 2003-11-25 | Intel Corporation | Radial air flow fan assembly having stator fins surrounding rotor blades |
US6877954B2 (en) * | 2003-04-08 | 2005-04-12 | Shueei-Muh Lin | Eccentric heat dispensing fans |
ITPN20030015U1 (en) * | 2003-05-09 | 2004-11-10 | Electrolux Home Products Corporatio N N V | DOMESTIC DRYER WITH PERFECTED FAN. |
US20050186070A1 (en) * | 2004-02-23 | 2005-08-25 | Ling-Zhong Zeng | Fan assembly and method |
DE202004012015U1 (en) * | 2004-07-31 | 2005-12-22 | Ebm-Papst Landshut Gmbh | radial impeller |
US7207779B2 (en) * | 2004-08-18 | 2007-04-24 | Sunonwealth Electric Machine Industry Co., Ltd. | Impeller for radial-flow heat dissipating fan |
US20060051203A1 (en) * | 2004-09-09 | 2006-03-09 | Sen-Yung Lee | High volume fan device for removing heat from heat sources |
EP1741934B1 (en) * | 2005-07-04 | 2015-06-10 | MAHLE Behr GmbH & Co. KG | Rotor |
TWI299074B (en) * | 2005-11-11 | 2008-07-21 | Delta Electronics Inc | Centrifugal fan and impeller thereof |
-
2006
- 2006-02-15 IT IT000004U patent/ITPN20060004U1/en unknown
-
2007
- 2007-01-29 BR BRPI0707934-6A patent/BRPI0707934A2/en not_active IP Right Cessation
- 2007-01-29 CN CN2007800056611A patent/CN101384766B/en not_active Expired - Fee Related
- 2007-01-29 WO PCT/EP2007/000723 patent/WO2007093274A1/en active Application Filing
- 2007-01-29 KR KR1020087021007A patent/KR20080094707A/en not_active Application Discontinuation
- 2007-01-29 EP EP07711398.3A patent/EP1984553B1/en not_active Not-in-force
- 2007-01-29 US US12/279,503 patent/US20090071029A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
ITPN20060004U1 (en) | 2007-08-16 |
WO2007093274A1 (en) | 2007-08-23 |
CN101384766A (en) | 2009-03-11 |
CN101384766B (en) | 2013-02-27 |
EP1984553A1 (en) | 2008-10-29 |
BRPI0707934A2 (en) | 2011-05-17 |
KR20080094707A (en) | 2008-10-23 |
US20090071029A1 (en) | 2009-03-19 |
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