EP2092105B1 - Heating device - Google Patents
Heating device Download PDFInfo
- Publication number
- EP2092105B1 EP2092105B1 EP06824493A EP06824493A EP2092105B1 EP 2092105 B1 EP2092105 B1 EP 2092105B1 EP 06824493 A EP06824493 A EP 06824493A EP 06824493 A EP06824493 A EP 06824493A EP 2092105 B1 EP2092105 B1 EP 2092105B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cover plate
- loop portion
- heating device
- heating body
- washing machine
- 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.)
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 115
- 238000010412 laundry washing Methods 0.000 claims abstract description 15
- 238000005406 washing Methods 0.000 claims description 54
- 239000007788 liquid Substances 0.000 claims description 20
- 239000010935 stainless steel Substances 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000000463 material Substances 0.000 description 13
- 238000007789 sealing Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00
- D06F39/04—Heating arrangements
Definitions
- the present invention relates to a heating device for a laundry washing machine and to a laundry washing machine including such a heating device.
- the washing liquid is heated for obtaining the desired washing temperature.
- electric resistor heating elements which are flooded by the washing liquid when the washing machine is running.
- a conventional resistor heater normally has a tubular heating body, which is laid out in one or several loops at the bottom of the washing machine.
- filamentary material such as threads, lint, fluff and the like
- the outlet for discharging the washing liquid is located at the bottom of the machine, the accumulated filamentary material may eventually block the outlet. This problem is especially experienced with professional washing machines for washing cleaning mops.
- ⁇ Document US 2005/0279141 A1 discloses a heater assembly for a washing machine.
- the heater assembly includes a cavity formed at a bottom surface of a tub storing washing water, a heater disposed in the cavity and heating the washing water, and a cover provided to the bottom surface of the tub and configured to cover the cavity
- Document DE 87 03 289 U1 discloses A clothes washing machine with a device for heating the washing solution.
- the heating device comprises an electrical resistance fixed to the outside surface of a metal plate whose inside surface forms a part of a wall of the washing solution collecting tank.
- Document DE 43 26 792 A1 discloses a water-boiling pot with a tubular heating element. To improve the arrangement the tubular heating element is fixed to the bottom of a plate which is located above the bottom of the pot and covers the tubular heating element.>
- a heating device for laundry washing machines comprises a tubular heating body and a cover plate.
- the tubular heating body comprises a loop portion that has a breadth, a length and a height.
- the cover plate comprises a main surface that has a longitudinal and transverse delimitation, and two side surfaces located at and along one longitudinal delimitation of the main surface respectively.
- the cover plate is attached to the tubular heating body, the main surface of the cover plate extends over the breadth of the loop portion and at least along a major length of the loop portion, and the side surfaces extend over the height of the loop portion, whereby the cover plate partially embraces the loop portion of the tubular heating body along the at least major length thereof.
- the heating device according to the invention When the heating device according to the invention is properly positioned in a washing machine, loose filamentary material in the washing liquid flowing passed the heating device will, due to the configuration of the cover plate according to the invention, slip over the cover plate and not entangle with the tubular heating body. At the same time, the tubular heating body will be in direct contact with the washing liquid below the cover plate such that the heat of the tubular heating body is directly transferred to the washing liquid.
- the choice of material for the cover plate is not limited to materials having good heat conductivity, whereby a material suitable with regard to the conditions in the washing liquid and to the manufacturing process can be used for the cover plate.
- the heating device according to the invention is suitable for being used in a washing machine for washing textiles that are likely to lose filamentary material such as threads, lint, fluff and the like, and especially in professional machines for washing cleaning mops.
- the washing machine can be of any conventional type, for example a front-loaded washing machine having an inner tub that is rotatably supported in a stationary outer tub.
- the heating device is of a kind including a tubular heating body, for example an electric resistor heater.
- the tubular heating body can have a circular, rectangular or any other suitable cross section.
- the tubular heating body is configured in one or several loop at a loop portion.
- loop is meant that the tubular heating body forms a closed or partly open curve within itself.
- the respective end portion of the tubular heating body that enters respectively exits the loop portion are substantially pointing in the same direction such that the end portions can be connected to a suitable power source at one side of the loop portion.
- the cover plate can be attached to the tubular heating body in any suitable manner, for example by using a fastener such as a clip, a nail or a screw, by welding or by using interlocking shapes of or friction between the cover plate and the tubular heating body.
- a fastener such as a clip, a nail or a screw
- the tubular heating body forms a package having a breadth, a length and a height.
- the cover plate has a main surface and two side surfaces and is arranged on the tubular heating body such that the cover plate partly embraces the loop portion while leaving an opening for the washing liquid between the edges of the side surfaces.
- the cover plate partially embraces the loop portion along a major length of the loop portion.
- the main surface and the two side surfaces can be one integral curved surface. It is also possible that the side surfaces protrude in an angle from the main surface.
- the main surface has a longitudinal and a transversal extension in order to cover at least one side of the loop portion along at least a major portion of the length thereof.
- the side surfaces are located along a longitudinal delimitation of the main surface and extend in the longitudinal direction of the main surface and cover the height of the loop portion.
- the side surfaces are provided with one flange respectively, which flanges prolongs the side surfaces to reach in under the loop portion on the side thereof that is opposite to the main surface.
- the cover plate with the main surface, the side surfaces and the flanges do not completely surround the loop portion, such that washing liquid is able to flow in between the flanges and contact the tubular heating body.
- the cover plate covers the loop portion along the entire length thereof, it is sufficient if the loop portion is covered to an extent that a gathering of filamentary material large enough to block the outlet or damage the washing machine in other ways is prevented.
- the cover plate is made of stainless steel, which is a material suitable for withstanding the corrosive conditions in the washing liquid. It has not been possible to use stainless steel for the moulded covers of the prior art, since the high temperatures needed for moulding stainless steel would damage the tubular heater.
- the tubular heating body is arranged in at least one U-shaped loop at the loop portion.
- Several loops can be arranged helically on top of each other or in a curve side by side.
- the heating device is included in a washing machine.
- the heating device is inserted through an opening at the bottom of the washing machine and subsequently the proximal end of the loop portion is fastened at the opening.
- a watertight seal is provided at the opening such that electrical connection terminals of the tubular heating body are separated from the washing liquid.
- the loop portion and the cover plate are configured to fit the geometrical restrictions of the opening and at the bottom of the washing machine such that the heating device can be removed and replaced in case of repairs or failure.
- the washing machine is provided with a securing plate under which a distal, not covered end of the loop portion is inserted.
- the cover plate according to this embodiment extends from the proximal end of the loop portion to the edge of the securing plate when the heating device in mounted in the washing machine. Consequently, substantially the entire length and height of the loop portion are covered.
- the heating device includes an electric resistor heater element comprising a tubular heating body 1.
- the tubular heating body 1 has a circular cross section and is arranged in one U-shaped loop forming a loop portion. Thus, the tubular heating body 1 forms a partly open curve within itself.
- the heating device further comprises a cover plate 2, which is attached to the tubular heating body 1.
- the cover plate 2 comprises a main surface 3, which has a breadth corresponding to the breadth of the loop portion and a length leaving the interconnecting curve of the U-shaped loop uncovered.
- Two side surfaces 4 extend substantially perpendicular from the main surface at one longitudinal side thereof respectively and cover the height of the loop portion, i.e. in this embodiment, the thickness of the tubular heating body 1.
- the transitional area 17, where the side surfaces 4 meet the main surface 3 has a curved shape.
- Each of the two side surfaces 4 is provided with one flange 5 extending a small distance on the side of the loop portion that is opposite to the main surface 3.
- the cover plate 2 including the main surface 3, the side surfaces 4 and the flanges 5 partially embrace the two legs of the U-shaped tubular heating body 1 of the loop portion along a major length thereof.
- the cover plate is attached to the tubular heating body 1 by a fastener in the form of a clip 14, which is welded to the cover plate 2.
- the clip 14 includes two semicircular end portions for engagement with the tubular heating body 1.
- the cover plate can be manufactured by bending and cutting a metal sheet of for example stainless steel. Thereafter, a fastener can be welded to the cover plate for enabling attachment to the tubular heating body.
- a sealing 6 is arranged at the ends of the legs of the U-shaped portion of the tubular heating body.
- the leg ends are provided with electrical connection terminals 7 for connection to a power source via electric wires 11.
- the heating device according to the first embodiment of the invention is shown in connection with a laundry washing machine, wherein only an interior part of the washing machine is shown.
- the laundry machine according to the described embodiment comprises an outer tub 8 and an inner tub 9, which is rotatably mounted in the outer tub 8.
- the outer tub 8 is provided with a bottom trough 10, which has an outlet opening 12 for discharging the washing liquid.
- the bottom trough 10 of the outer tub 8 is equipped with a securing device in the form of a corrugated plate 13.
- the corrugated plate 13 is provided with guide flanges 16.
- the first embodiment of the heating device according to the invention functions in the following way.
- the cover plate 2 is attached to the tubular heating body 1 by snapping the clips around the leg portions of the U-shaped loop, wherein the interconnecting curved portion of the U-shaped loop protrudes out of the cover plate 2.
- the heating device is inserted between the inner tub 9 and the outer tub 8 of the washing machine through one of the holes 15.
- the heating device reaches the corrugated plate 13, it is guided by the guide flanges 16 into a casing formed by the corrugated plate 13 and the bottom of the through 10.
- the heating device is positioned with the sealing 6 in the hole 15 and locked in this position by for example a locking screw (not shown).
- the electric terminals 7 are connected to a power source (not shown) via the electric wires 11.
- the heating device is prevented from contacting the rotating inner tub when the washing machine is running. Furthermore, the corrugate plate covers the uncovered, protruding portion of the loop portion, such that substantially the entire length of the loop portion is covered when the heating device is positioned in the washing machine.
- the heating device When the washing machine is running, the heating device is flooded under the washing liquid such the tubular heating body 1 is able to directly transfer heat to the washing liquid. If any filamentary material is present in the washing liquid, it will flow against the cover plate, which will force the filamentary material to slip pass the heating device either above or under the loop portion. This property of the cover plate is enhanced by the curved transitional area 17 and by the flanges 5.
- the heating device can easily be removed by disconnecting the heating device from the power source, unlocking the locking screw an pulling the heating device out of the hole 15.
- FIG. 4 and 5 alternative embodiments of the heating device according to invention are shown.
- the embodiment according to Fig. 4 differs from the first embodiment described above substantially only in that the loop portion of the tubular heating body 1 comprises two loops arranged side by side.
- the embodiment according to Fig. 5 differs from the first embodiment described above substantially only in that the loop portion of the tubular heating body 1 comprises two loops, which are arranged helically on top of each other. Both these alternative embodiments can be included in a washing machine in the same manner as the first embodiment described above.
- Fig. 6 a sectional view of the heating device according to Fig. 5 is shown.
- the cover plate 2 partially embraces the tubular heating body 1 at the loop portion by means of the main surface 3, the side surfaces 4, the curved transitional areas 17 and the flanges 5.
- the cross section of the clip 14 can be seen in Fig. 6 .
- the clip 14 is welded to the main surfaces 3 and reaches around two opposed leg portions of the U-shaped loop from within the U-shaped loop to hold the tubular heating body 1.
- FIG. 7 and 8 further alternative embodiments of the heating device according to invention are shown.
- Figs.7 and 8 a cross section of the respective heating device is shown, wherein the fastener is not visible although present in these embodiments too.
- the embodiment according to Fig. 7 has a loop portion with the same configuration as the embodiment according to Fig. 5 and 6 .
- the embodiment according to Fig. 7 differs from the embodiment described above with reference to Figs. 5 and 6 substantially only in that the cover plate 2 has a curved cross section.
- the embodiment according to Fig. 8 differs from the first embodiment described above substantially only in that the loop portion of the tubular heating body 1 comprises two loops, which are arranged in two levels, and in that the cover plate 2 has a different cross section.
- the main surface according to this embodiment includes two angled parts 3a, 3b. Also these alternative embodiments can be included in a washing machine in the same manner as the first embodiment described above.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Detail Structures Of Washing Machines And Dryers (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
- Control And Other Processes For Unpacking Of Materials (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
- Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
- Accessory Of Washing/Drying Machine, Commercial Washing/Drying Machine, Other Washing/Drying Machine (AREA)
Abstract
Description
- The present invention relates to a heating device for a laundry washing machine and to a laundry washing machine including such a heating device.
- In most laundry washing machines, the washing liquid is heated for obtaining the desired washing temperature. For this purpose, it is known to use electric resistor heating elements, which are flooded by the washing liquid when the washing machine is running. A conventional resistor heater normally has a tubular heating body, which is laid out in one or several loops at the bottom of the washing machine. A problem associated with such electric heaters is that filamentary material, such as threads, lint, fluff and the like, that come loose from the laundry can get caught on the tubular body of the heaters. This will cause even more filamentary material to entangle and gather around the resistor heaters at the bottom of the washing machine. Since the outlet for discharging the washing liquid is located at the bottom of the machine, the accumulated filamentary material may eventually block the outlet. This problem is especially experienced with professional washing machines for washing cleaning mops.
- <Document
US 2005/0279141 A1 discloses a heater assembly for a washing machine. The heater assembly includes a cavity formed at a bottom surface of a tub storing washing water, a heater disposed in the cavity and heating the washing water, and a cover provided to the bottom surface of the tub and configured to cover the cavity - Document
DE 87 03 289 U1 discloses A clothes washing machine with a device for heating the washing solution. The heating device comprises an electrical resistance fixed to the outside surface of a metal plate whose inside surface forms a part of a wall of the washing solution collecting tank. - Document
DE 43 26 792 A1 discloses a water-boiling pot with a tubular heating element. To improve the arrangement the tubular heating element is fixed to the bottom of a plate which is located above the bottom of the pot and covers the tubular heating element.> -
DE 197 49 958 B4 discloses a washing machine heater comprising a tubular resistor heater that is embedded in a block of an aluminium alloy. A problem with this known heater is that aluminium cannot satisfactory withstand the tough conditions in the washing liquid. - It is therefore an object of the present invention to provide a heating device for laundry washing machines that alleviates the above-mentioned problems.
- According to the invention this object is achieved by a heating device according to
claim 1. - A heating device for laundry washing machines according to the invention comprises a tubular heating body and a cover plate. The tubular heating body comprises a loop portion that has a breadth, a length and a height. The cover plate comprises a main surface that has a longitudinal and transverse delimitation, and two side surfaces located at and along one longitudinal delimitation of the main surface respectively. The cover plate is attached to the tubular heating body, the main surface of the cover plate extends over the breadth of the loop portion and at least along a major length of the loop portion, and the side surfaces extend over the height of the loop portion, whereby the cover plate partially embraces the loop portion of the tubular heating body along the at least major length thereof.
- When the heating device according to the invention is properly positioned in a washing machine, loose filamentary material in the washing liquid flowing passed the heating device will, due to the configuration of the cover plate according to the invention, slip over the cover plate and not entangle with the tubular heating body. At the same time, the tubular heating body will be in direct contact with the washing liquid below the cover plate such that the heat of the tubular heating body is directly transferred to the washing liquid. Thus the choice of material for the cover plate is not limited to materials having good heat conductivity, whereby a material suitable with regard to the conditions in the washing liquid and to the manufacturing process can be used for the cover plate.
- The heating device according to the invention is suitable for being used in a washing machine for washing textiles that are likely to lose filamentary material such as threads, lint, fluff and the like, and especially in professional machines for washing cleaning mops. The washing machine can be of any conventional type, for example a front-loaded washing machine having an inner tub that is rotatably supported in a stationary outer tub.
- According to the invention, the heating device is of a kind including a tubular heating body, for example an electric resistor heater.
- According to the invention, the tubular heating body can have a circular, rectangular or any other suitable cross section.
- According to the invention, the tubular heating body is configured in one or several loop at a loop portion. By loop is meant that the tubular heating body forms a closed or partly open curve within itself. Normally, the respective end portion of the tubular heating body that enters respectively exits the loop portion are substantially pointing in the same direction such that the end portions can be connected to a suitable power source at one side of the loop portion.
- According to the invention, the cover plate can be attached to the tubular heating body in any suitable manner, for example by using a fastener such as a clip, a nail or a screw, by welding or by using interlocking shapes of or friction between the cover plate and the tubular heating body.
- At the loop portion, the tubular heating body forms a package having a breadth, a length and a height.
- According to the invention, the cover plate has a main surface and two side surfaces and is arranged on the tubular heating body such that the cover plate partly embraces the loop portion while leaving an opening for the washing liquid between the edges of the side surfaces. The cover plate partially embraces the loop portion along a major length of the loop portion.
- According to the invention, the main surface and the two side surfaces can be one integral curved surface. It is also possible that the side surfaces protrude in an angle from the main surface. The main surface has a longitudinal and a transversal extension in order to cover at least one side of the loop portion along at least a major portion of the length thereof. The side surfaces are located along a longitudinal delimitation of the main surface and extend in the longitudinal direction of the main surface and cover the height of the loop portion. Thereby it is ensured that any filamentary material in the washing liquid will slip over the cover plate of the heating device when it is immersed in the washing liquid.
- According to one embodiment of the invention the side surfaces are provided with one flange respectively, which flanges prolongs the side surfaces to reach in under the loop portion on the side thereof that is opposite to the main surface. However, the cover plate with the main surface, the side surfaces and the flanges do not completely surround the loop portion, such that washing liquid is able to flow in between the flanges and contact the tubular heating body.
- According to the invention, it is not necessary that the cover plate covers the loop portion along the entire length thereof, it is sufficient if the loop portion is covered to an extent that a gathering of filamentary material large enough to block the outlet or damage the washing machine in other ways is prevented.
- According to one embodiment of the invention, the cover plate is made of stainless steel, which is a material suitable for withstanding the corrosive conditions in the washing liquid. It has not been possible to use stainless steel for the moulded covers of the prior art, since the high temperatures needed for moulding stainless steel would damage the tubular heater.
- According to one embodiment of the invention, the tubular heating body is arranged in at least one U-shaped loop at the loop portion. Several loops can be arranged helically on top of each other or in a curve side by side.
- According to one embodiment of the invention, the heating device is included in a washing machine. The heating device is inserted through an opening at the bottom of the washing machine and subsequently the proximal end of the loop portion is fastened at the opening. A watertight seal is provided at the opening such that electrical connection terminals of the tubular heating body are separated from the washing liquid.
- According to one embodiment, the loop portion and the cover plate are configured to fit the geometrical restrictions of the opening and at the bottom of the washing machine such that the heating device can be removed and replaced in case of repairs or failure.
- According to one embodiment, the washing machine is provided with a securing plate under which a distal, not covered end of the loop portion is inserted. The cover plate according to this embodiment extends from the proximal end of the loop portion to the edge of the securing plate when the heating device in mounted in the washing machine. Consequently, substantially the entire length and height of the loop portion are covered.
- The invention may be performed in many different ways, and by way of example only, embodiments thereof will now be described in detail with reference being made to the accompanying drawings, in which:
-
Fig. 1 is an exploded view of interior parts of a washing machine including a heating device according to a first embodiment of the invention; -
Fig. 2 is a perspective view from above of the heating device according to the first embodiment of the invention; -
Fig. 3 is a perspective view from below of the heating device according to the first embodiment of the invention; -
Fig. 4 is a perspective view from below of a heating device according to a second embodiment of the invention; -
Fig. 5 is a perspective view from below of a heating device according to a third embodiment of the invention; -
Fig. 6 is a sectional view of the heating device according to the third embodiment of the invention; -
Fig. 7 is a sectional view of a heating device according to a fourth embodiment of the invention; -
Fig. 8 is a sectional view of a heating device according to a fifth embodiment of the invention; -
Fig. 9 is a perspective view of a bottom of a washing machine including three heating devices according to the first embodiment of the invention. - With reference to
Figs. 2 and 3 , a first embodiment of the heating device according to the invention is shown. The heating device includes an electric resistor heater element comprising atubular heating body 1. Thetubular heating body 1 has a circular cross section and is arranged in one U-shaped loop forming a loop portion. Thus, thetubular heating body 1 forms a partly open curve within itself. - The heating device further comprises a
cover plate 2, which is attached to thetubular heating body 1. Thecover plate 2 comprises amain surface 3, which has a breadth corresponding to the breadth of the loop portion and a length leaving the interconnecting curve of the U-shaped loop uncovered. Twoside surfaces 4 extend substantially perpendicular from the main surface at one longitudinal side thereof respectively and cover the height of the loop portion, i.e. in this embodiment, the thickness of thetubular heating body 1. Thetransitional area 17, where the side surfaces 4 meet themain surface 3, has a curved shape. Each of the twoside surfaces 4 is provided with oneflange 5 extending a small distance on the side of the loop portion that is opposite to themain surface 3. Thus, thecover plate 2 including themain surface 3, the side surfaces 4 and theflanges 5 partially embrace the two legs of the U-shapedtubular heating body 1 of the loop portion along a major length thereof. - The cover plate is attached to the
tubular heating body 1 by a fastener in the form of aclip 14, which is welded to thecover plate 2. Theclip 14 includes two semicircular end portions for engagement with thetubular heating body 1. - Consequently, the cover plate can be manufactured by bending and cutting a metal sheet of for example stainless steel. Thereafter, a fastener can be welded to the cover plate for enabling attachment to the tubular heating body.
- At the ends of the legs of the U-shaped portion of the tubular heating body, a sealing 6 is arranged. On the side of the sealing 6 that is opposite to the loop portion, the leg ends are provided with
electrical connection terminals 7 for connection to a power source viaelectric wires 11. - With reference to
Figs 1 and9 , the heating device according to the first embodiment of the invention is shown in connection with a laundry washing machine, wherein only an interior part of the washing machine is shown. The laundry machine according to the described embodiment comprises anouter tub 8 and aninner tub 9, which is rotatably mounted in theouter tub 8. Theouter tub 8 is provided with abottom trough 10, which has anoutlet opening 12 for discharging the washing liquid. At a rear portion, thebottom trough 10 of theouter tub 8 is equipped with a securing device in the form of acorrugated plate 13. Thecorrugated plate 13 is provided withguide flanges 16. At the front wall of the bottom through 10, there are threeholes 15 for three heating devices respectively. - The first embodiment of the heating device according to the invention functions in the following way.
- The
cover plate 2 is attached to thetubular heating body 1 by snapping the clips around the leg portions of the U-shaped loop, wherein the interconnecting curved portion of the U-shaped loop protrudes out of thecover plate 2. Thereafter, the heating device is inserted between theinner tub 9 and theouter tub 8 of the washing machine through one of theholes 15. When the heating device reaches thecorrugated plate 13, it is guided by theguide flanges 16 into a casing formed by thecorrugated plate 13 and the bottom of the through 10. Then the heating device is positioned with the sealing 6 in thehole 15 and locked in this position by for example a locking screw (not shown). Finally, theelectric terminals 7 are connected to a power source (not shown) via theelectric wires 11. - Due to the corrugated plate, the heating device is prevented from contacting the rotating inner tub when the washing machine is running. Furthermore, the corrugate plate covers the uncovered, protruding portion of the loop portion, such that substantially the entire length of the loop portion is covered when the heating device is positioned in the washing machine.
- When the washing machine is running, the heating device is flooded under the washing liquid such the
tubular heating body 1 is able to directly transfer heat to the washing liquid. If any filamentary material is present in the washing liquid, it will flow against the cover plate, which will force the filamentary material to slip pass the heating device either above or under the loop portion. This property of the cover plate is enhanced by the curvedtransitional area 17 and by theflanges 5. - If necessary, for example for repairs, the heating device can easily be removed by disconnecting the heating device from the power source, unlocking the locking screw an pulling the heating device out of the
hole 15. - In
Fig. 4 and 5 alternative embodiments of the heating device according to invention are shown. The embodiment according toFig. 4 differs from the first embodiment described above substantially only in that the loop portion of thetubular heating body 1 comprises two loops arranged side by side. The embodiment according toFig. 5 differs from the first embodiment described above substantially only in that the loop portion of thetubular heating body 1 comprises two loops, which are arranged helically on top of each other. Both these alternative embodiments can be included in a washing machine in the same manner as the first embodiment described above. - In
Fig. 6 a sectional view of the heating device according toFig. 5 is shown. Thecover plate 2 partially embraces thetubular heating body 1 at the loop portion by means of themain surface 3, the side surfaces 4, the curvedtransitional areas 17 and theflanges 5. In addition, the cross section of theclip 14 can be seen inFig. 6 . Theclip 14 is welded to themain surfaces 3 and reaches around two opposed leg portions of the U-shaped loop from within the U-shaped loop to hold thetubular heating body 1. - In
figs. 7 and 8 further alternative embodiments of the heating device according to invention are shown. InFigs.7 and 8 , a cross section of the respective heating device is shown, wherein the fastener is not visible although present in these embodiments too. The embodiment according toFig. 7 has a loop portion with the same configuration as the embodiment according toFig. 5 and6 . The embodiment according toFig. 7 differs from the embodiment described above with reference toFigs. 5 and6 substantially only in that thecover plate 2 has a curved cross section. The embodiment according toFig. 8 differs from the first embodiment described above substantially only in that the loop portion of thetubular heating body 1 comprises two loops, which are arranged in two levels, and in that thecover plate 2 has a different cross section. The main surface according to this embodiment includes twoangled parts 3a, 3b. Also these alternative embodiments can be included in a washing machine in the same manner as the first embodiment described above.
Claims (15)
- A heating device for laundry washing machines, comprising
a tubular heating body (1) which comprises a loop portion having a breadth, a length and a height, and
a cover plater (2) which comprises a main surface (3) having a longitudinal and transverse delimitation, and two side surfaces (4) located at and along one longitudinal delimitation of the main surface (3) respectively, characterised by that
the cover plate (2) is attached to the tubular heating body (1),
the main surface (3) of the cover plate (2) extends over the breadth of the loop portion and at least along a major length of the loop portion, and wherein
the side surfaces (4) of the cover plate (2) extend over the height of the loop portion,
whereby the cover plate (2) partially embraces the loop portion of the tubular heating body (1) along the at least major length thereof. - The heating device according to claim 1, wherein the side surfaces (4) include one longitudinal flange (5) respectively, which flanges (5) are angled towards each other such that the cover plate (2) embraces the loop portion of the tubular heating body (1) more than 180° while leaving a gap between the flanges. (5).
- The heating device according to claim 1 or 2,
wherein side surfaces (4) of the cover plate (2) are substantially perpendicular to the main surface (3) of the cover plate (2). - The heating device according to any of the claims 1 - 3, wherein the cover plate (2) closely fits over the loop portion and follows the geometry of the loop portion.
- The heating device according to claim 4, wherein, in suitable positions, the main surface (3) has bent portions and the side surfaces have cuts.
- The heating device according to any of the claims 1 - 5, wherein the loop portion has the form of at least one U-shaped loop.
- The heating device according to claims 6, wherein a fastener is affixed to the cover plate, wherein the fastener comprises a clip (14) having two end portions, which end portions are arranged to hold two opposed leg portions of the at least one U-shaped loop.
- The heating device according to any of the claims 1 - 7, wherein the cover plate (2) is made of stainless steel.
- The heating device according to any of the claims 1 - 7, wherein the tubular heating body comprises an electric resistor heater element and wherein the tubular heating body, at the two ends thereof, is provided with one electrical connection terminal (7) respectively for power supply of the electric resistor heater element
- A laundry washing machine, characterised by comprising at least one heating device according to any of the claims 1 - 9.
- The laundry washing machine according to claim 10, further comprising an inner tub (9) for receiving laundry and an outer tub (8) for holding a washing liquid, wherein the inner tub (9) is rotatably supported in the outer tub (8), and wherein the heating device is removably arranged between the inner tub (9) and the outer tub (8) at the bottom of the outer tub (8).
- The laundry washing machine according to claim 11, wherein the outer tub (8) is provided with a securing device for preventing the heating device to contact the outer tub.
- The laundry washing machine according to claim 12, wherein the securing device includes a casing for receiving a distal, not covered end of the loop portion, such that the cover plate and the casing together covers the entire length of the loop portion.
- The laundry washing machine according to claim 13, wherein the securing device includes a corrugated plate (13), which in cooperation with the bottom of the outer tub (8), forms several casings for receiving the distal end of several heating devices respectively.
- The laundry washing machine according to any of the claims 11 - 14, wherein the heating device is arranged at the bottom of the outer tub (8) such that washing liquid, when circulating pass the loop portion, is able to directly contact the tubular heating body.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/SE2006/001360 WO2008066418A1 (en) | 2006-11-29 | 2006-11-29 | Heating device |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2092105A1 EP2092105A1 (en) | 2009-08-26 |
EP2092105A4 EP2092105A4 (en) | 2011-04-06 |
EP2092105B1 true EP2092105B1 (en) | 2011-11-09 |
Family
ID=39468122
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06824493A Active EP2092105B1 (en) | 2006-11-29 | 2006-11-29 | Heating device |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2092105B1 (en) |
AT (1) | ATE532896T1 (en) |
DK (1) | DK2092105T3 (en) |
WO (1) | WO2008066418A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017036172A1 (en) * | 2015-09-06 | 2017-03-09 | 无锡小天鹅股份有限公司 | Washing machine |
CN105155227B (en) * | 2015-09-06 | 2018-08-28 | 无锡小天鹅股份有限公司 | Washing machine |
CN107190455B (en) * | 2017-04-27 | 2020-08-11 | 无锡小天鹅通用电器有限公司 | Clothes treating apparatus |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2739744A1 (en) * | 1977-09-03 | 1979-03-15 | Licentia Gmbh | Clothing or dish washing machine heated rod mounting - has sprung plates and counter beds to hold the rod between them |
IT8034028V0 (en) * | 1980-07-11 | 1980-07-11 | Zanussi A Spa Industrie | WASHING MACHINE EQUIPPED WITH ELECTRIC HEATING ELEMENTS. |
FR2538821B1 (en) * | 1982-12-30 | 1986-09-19 | Amiens Const Elect Mec | PLASTIC TANK WASHING MACHINE |
IT8434049V0 (en) * | 1984-09-13 | 1984-09-13 | Zanussi Elettrodomestici | WASHING MACHINE WITH PERFECT FIXING OF THE ELECTRIC HEATING ELEMENTS. |
IT211129Z2 (en) | 1986-03-17 | 1989-02-13 | Zanussi Elettrodomestici | WASHING MACHINE WITH DEVICE FOR HEATING THE LASCIVA. |
DE4112230C2 (en) * | 1991-04-15 | 1995-05-24 | Miele & Cie | Fastening device for the radiator of a washing machine |
DE4326792A1 (en) | 1993-08-10 | 1995-02-16 | Stiebel Eltron Gmbh & Co Kg | Water-boiling pot (kettle, jug) |
DE19749958B4 (en) * | 1997-11-03 | 2004-04-15 | Miele & Cie. Kg | Washing machine with a tubular heater |
DE19844568C1 (en) * | 1998-09-29 | 1999-10-21 | Miele & Cie | Fastening device for electrical tubular heating bodies of drum washing machines |
JP2004337406A (en) * | 2003-05-16 | 2004-12-02 | Toshiba Corp | Washing machine |
US20050279141A1 (en) * | 2004-06-21 | 2005-12-22 | Lg Electronics Inc. | Heater assembly for washing machine |
JP2006051324A (en) * | 2004-07-15 | 2006-02-23 | Sanyo Electric Co Ltd | Washing machine |
ITVE20050008U1 (en) * | 2005-03-14 | 2006-09-15 | I R C A S P A Ind Resistenze | HEATING ELEMENT. |
-
2006
- 2006-11-29 DK DK06824493.8T patent/DK2092105T3/en active
- 2006-11-29 AT AT06824493T patent/ATE532896T1/en active
- 2006-11-29 WO PCT/SE2006/001360 patent/WO2008066418A1/en active Application Filing
- 2006-11-29 EP EP06824493A patent/EP2092105B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP2092105A4 (en) | 2011-04-06 |
WO2008066418A1 (en) | 2008-06-05 |
DK2092105T3 (en) | 2012-02-27 |
ATE532896T1 (en) | 2011-11-15 |
EP2092105A1 (en) | 2009-08-26 |
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