EP0386724A1 - Washing machine - Google Patents
Washing machine Download PDFInfo
- Publication number
- EP0386724A1 EP0386724A1 EP90104340A EP90104340A EP0386724A1 EP 0386724 A1 EP0386724 A1 EP 0386724A1 EP 90104340 A EP90104340 A EP 90104340A EP 90104340 A EP90104340 A EP 90104340A EP 0386724 A1 EP0386724 A1 EP 0386724A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hole
- washing
- drum
- pipe
- washing chamber
- 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.)
- Granted
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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
- D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00
- D06F39/08—Liquid supply or discharge arrangements
- D06F39/083—Liquid discharge or recirculation arrangements
- D06F39/086—Arrangements for avoiding detergent wastage in the discharge conduit
Definitions
- the present invention relates to a washing machine comprising a washing chamber with a first hole on its lower side connected to a drain pump through a pipe, and with a second hole connected to said drain pump through a pipe, and inside said washing chamber a drum revolving around a horizontal axis.
- soap-powder concentration is very high.
- Said soap-powder with is not yet dissolved, deposits mixed with water on the lowest part of the washing chamber where there is the pipe connecting to the discharge pump, which for hydraulic reasons should be the lowest spot of the system.
- German Patent Application nr. 26 55 556 describes a washing machine where the washing chamber has a further hole connected to the discharge pump in addition to the standard outlet hole.
- Such an additional hole is located above the water level normally reached by the water in the washing chamber; during washing cycle the alternate drum rotation causes a water motion and a small part of water falls into such an additional hole acquiring enough speed by gravity so as to flow back up to the washing chamber through the standard outlet hole.
- Italian Patent nr. 1 082 306 describes a washing machine with a soap-powder recovery system similar to the one described in the German application; however, it is provided with a second hole at a lower level than normally reached by the water in the washing chamber; according to the patent application circulation is obtained anyway, since due to the drum motion some differences of hydraulic pressure occur.
- Said system are not very efficient though ensuring a partial recovery of the soap-powder being wasted.
- Purpose of the present invention is to indicate a washing machine with a system as simple as the ones already known but performing to a more efficient extent for the recovery of the greatest part of soap-powder accumulated inside the discharge pipe system during intake.
- a washing machine comprising a washing chamber with a first hole on its lower side connected to a drain pump through a pipe, and with a second hole connected to said drain pump through a pipe, and inside said washing chamber a drum revolving around a horizontal axis, characterized in that during washing the configuration of said revolving drum produces an effect that is similar to that of a pump propeller; that such second hole is located preferably at a level not over the one where is located said first hole, and that the washing chamber is configurated in such a way to have the pipe connecting said second hole to the drain pump arranged tangentially to the drum rotation sense, so that when the drum rotates it causes the washing fluid to enter said second hole and said tangential pipe with enough force to cause an efficient circulation of said fluid, which flows back into the washing chamber through said first hole.
- washing chamber 1 refers to the washing chamber, which may be of enamelled sheet, stainless steel or plastic material; washing chamber 1 shows number 2 a first hole connected to the drain pump 3 by a pipe, namely to an upright pipe-socket of said pump.
- Washing chamber 1 also shows a second hole referred under number 4, tangential to the washing chamber but slightly lower than the first hole 2.
- the second hole 4 is connected to the same pump 3 through a pipe 8.
- Pump 3 shows a third outlet pipe-socket 6.
- Washing chamber 1 contains the revolving drum 7, where the laundry to be washed is introduced; said drum 7 has three V-shaped recesses 5, whose vertexes are directed to the drum centre.
- the special drum configuration as well as that of the washing chamber cooperate to let the drum acting as a real and true pump propeller whose screw, in the specific instance, is represented by the washing chamber.
- the drum rotates both clockwise and anti-clockwise alternatively at a speed rate of about 60 rev/min.
- the pipe connecting the washing chamber to the pump arranged perfectly tangential to a washing chamber wall the condition is obtained where the drum exerts a pressure inside the pipe itself by rotating tangentially to the piping.
- both the synergy obtained through the special drum configuration and arrangement of the second hole as well as the tangential location of the relevant piping allow an efficient circulation, without any cost increase, for the recovery of most part of the soap-powder accumulated at the bottom of the machine during intake stage.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Detail Structures Of Washing Machines And Dryers (AREA)
Abstract
Description
- The present invention relates to a washing machine comprising a washing chamber with a first hole on its lower side connected to a drain pump through a pipe, and with a second hole connected to said drain pump through a pipe, and inside said washing chamber a drum revolving around a horizontal axis.
- As known, one problem washing machine manufacturers have to solve is to reduce the waste of soap-powder, as it used to occur in the machines till a few years ago due to the intake method of said powder. Soap-powder is taken in from the so-called "dispenser" by means of a water jet conveying the powder into the washing chamber within a time ranging from 90 to 120 secs.
- Obviously, the major part of the soap-powder is flushed in during the initial seconds of intake, so that initially soap-powder concentration is very high.
- Said soap-powder, with is not yet dissolved, deposits mixed with water on the lowest part of the washing chamber where there is the pipe connecting to the discharge pump, which for hydraulic reasons should be the lowest spot of the system.
- It is obvious that the pump screw and connected pipes fill up with said water soap-powder mix, which will remain inactive during both pre-wash and wash cycles, as it is not in contact with the laundry inside the drum.
- During the last few years several systems have been suggested to obviate to such an inconvenience causing a waste of soap-powder whereby both the washing costs and environmental pollution increase. As an example, German Patent Application nr. 26 55 556 describes a washing machine where the washing chamber has a further hole connected to the discharge pump in addition to the standard outlet hole.
- Such an additional hole is located above the water level normally reached by the water in the washing chamber; during washing cycle the alternate drum rotation causes a water motion and a small part of water falls into such an additional hole acquiring enough speed by gravity so as to flow back up to the washing chamber through the standard outlet hole.
- Through such a circulation it is possible to reduce the waste of soap-powder, as a part of the powder initially accumulated in the discharge system is recirculated.
- Italian Patent nr. 1 082 306 describes a washing machine with a soap-powder recovery system similar to the one described in the German application; however, it is provided with a second hole at a lower level than normally reached by the water in the washing chamber; according to the patent application circulation is obtained anyway, since due to the drum motion some differences of hydraulic pressure occur.
- Said system are not very efficient though ensuring a partial recovery of the soap-powder being wasted.
- Purpose of the present invention is to indicate a washing machine with a system as simple as the ones already known but performing to a more efficient extent for the recovery of the greatest part of soap-powder accumulated inside the discharge pipe system during intake.
- To achieve said purpose it is the aim of the present invention to realize a washing machine comprising a washing chamber with a first hole on its lower side connected to a drain pump through a pipe, and with a second hole connected to said drain pump through a pipe, and inside said washing chamber a drum revolving around a horizontal axis, characterized in that during washing the configuration of said revolving drum produces an effect that is similar to that of a pump propeller; that such second hole is located preferably at a level not over the one where is located said first hole, and that the washing chamber is configurated in such a way to have the pipe connecting said second hole to the drain pump arranged tangentially to the drum rotation sense, so that when the drum rotates it causes the washing fluid to enter said second hole and said tangential pipe with enough force to cause an efficient circulation of said fluid, which flows back into the washing chamber through said first hole.
- Other purposes and advantages of the present invention are clearly detailed in the following description and annexed drawings supplied by way of explanatory but not limiting example, where:
- the figure is a sectional view of the washing chamber and discharge piping of a washing machine according to the present invention. - In said figure describing the washing chamber and outlet hoses of a washing machine according to the present invention, ref. nr. 1 refers to the washing chamber, which may be of enamelled sheet, stainless steel or plastic material; washing chamber 1 shows number 2 a first hole connected to the
drain pump 3 by a pipe, namely to an upright pipe-socket of said pump. - Washing chamber 1 also shows a second hole referred under number 4, tangential to the washing chamber but slightly lower than the
first hole 2. - The second hole 4 is connected to the
same pump 3 through apipe 8.Pump 3 shows a third outlet pipe-socket 6. - Washing chamber 1 contains the revolving
drum 7, where the laundry to be washed is introduced; saiddrum 7 has three V-shaped recesses 5, whose vertexes are directed to the drum centre. - The special drum configuration as well as that of the washing chamber cooperate to let the drum acting as a real and true pump propeller whose screw, in the specific instance, is represented by the washing chamber.
- During pre-wash and/or washing the drum rotates both clockwise and anti-clockwise alternatively at a speed rate of about 60 rev/min. With the pipe connecting the washing chamber to the pump arranged perfectly tangential to a washing chamber wall the condition is obtained where the drum exerts a pressure inside the pipe itself by rotating tangentially to the piping.
- Thus, an efficient circulation from the washing chamber to the pump and back again to the washing chamber is ensured, so that the soap-powder that otherwise would remain unused is returned to the washing chamber.
- Due to the washing and pre-wash times lasting long enough, it is possible for the soap-powder to dissolve and be recovered. The characteristics of the above washing machine are clearly shown in the above description and annexed drawings.
- Likewise the above description is also clearly showing the advantages of the washing machine according to the present invention; as a matter of fact, both the synergy obtained through the special drum configuration and arrangement of the second hole as well as the tangential location of the relevant piping allow an efficient circulation, without any cost increase, for the recovery of most part of the soap-powder accumulated at the bottom of the machine during intake stage.
- It is obvious that for the man skilled in the art many other changes are possible to the washing machine described by way of example but without departing from the scope of the innovating criteria inherent of the present invention.
Claims (4)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT6715589 | 1989-03-07 | ||
IT8967155A IT1234975B (en) | 1989-03-07 | 1989-03-07 | WASHING MACHINE INCLUDING REVOLVING DRUM WITH THE EFFECT SIMILAR TO THAT OF THE IMPELLER OF A PUMP |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0386724A1 true EP0386724A1 (en) | 1990-09-12 |
EP0386724B1 EP0386724B1 (en) | 1994-07-27 |
Family
ID=11300049
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90104340A Expired - Lifetime EP0386724B1 (en) | 1989-03-07 | 1990-03-07 | Washing machine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0386724B1 (en) |
DE (1) | DE69010936T2 (en) |
ES (1) | ES2057220T3 (en) |
IT (1) | IT1234975B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2703546A1 (en) * | 2012-08-29 | 2014-03-05 | Electrolux Home Products Corporation N.V. | Laundry washing machine |
EP2703537A1 (en) * | 2012-08-29 | 2014-03-05 | Electrolux Home Products Corporation N.V. | Method for washing laundry in a laundry washing machine and laundry washing machine |
US9903065B2 (en) | 2012-08-29 | 2018-02-27 | Electrolux Home Products Corporation N.V. | Laundry washing machine |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1339811A (en) * | 1961-11-15 | 1963-10-11 | Bauknecht Gmbh G | Washing machine |
DE2655556A1 (en) * | 1976-12-08 | 1978-06-15 | Miele & Cie | WASHING MACHINE |
DE7813880U1 (en) * | 1977-05-13 | 1978-08-24 | Industrie A. Zanussi S.P.A., Pordenone, Udine (Italien) | Washing machine, in particular a household washing machine, with a device for returning detergent to the washing container |
-
1989
- 1989-03-07 IT IT8967155A patent/IT1234975B/en active
-
1990
- 1990-03-07 DE DE69010936T patent/DE69010936T2/en not_active Expired - Fee Related
- 1990-03-07 ES ES90104340T patent/ES2057220T3/en not_active Expired - Lifetime
- 1990-03-07 EP EP90104340A patent/EP0386724B1/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1339811A (en) * | 1961-11-15 | 1963-10-11 | Bauknecht Gmbh G | Washing machine |
DE2655556A1 (en) * | 1976-12-08 | 1978-06-15 | Miele & Cie | WASHING MACHINE |
DE7813880U1 (en) * | 1977-05-13 | 1978-08-24 | Industrie A. Zanussi S.P.A., Pordenone, Udine (Italien) | Washing machine, in particular a household washing machine, with a device for returning detergent to the washing container |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2703546A1 (en) * | 2012-08-29 | 2014-03-05 | Electrolux Home Products Corporation N.V. | Laundry washing machine |
EP2703537A1 (en) * | 2012-08-29 | 2014-03-05 | Electrolux Home Products Corporation N.V. | Method for washing laundry in a laundry washing machine and laundry washing machine |
WO2014032926A1 (en) * | 2012-08-29 | 2014-03-06 | Electrolux Home Products Corporation N.V. | Method for washing laundry in a laundry washing machine and laundry washing machine |
WO2014032942A1 (en) * | 2012-08-29 | 2014-03-06 | Electrolux Home Products Corporation N.V. | Laundry washing machine |
CN104619903A (en) * | 2012-08-29 | 2015-05-13 | 伊莱克斯家用产品股份有限公司 | Laundry washing machine |
US9777426B2 (en) | 2012-08-29 | 2017-10-03 | Electrolux Home Products Corporation N.V. | Laundry washing machine |
US9903065B2 (en) | 2012-08-29 | 2018-02-27 | Electrolux Home Products Corporation N.V. | Laundry washing machine |
Also Published As
Publication number | Publication date |
---|---|
IT8967155A0 (en) | 1989-03-07 |
ES2057220T3 (en) | 1994-10-16 |
DE69010936D1 (en) | 1994-09-01 |
EP0386724B1 (en) | 1994-07-27 |
IT1234975B (en) | 1992-06-09 |
DE69010936T2 (en) | 1994-11-17 |
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