Apparatus for generating steam is disclosed. It comprises a water inlet (19), an evaporation surface (24), and a heater (26) disposed adjacent to the evaporation surface to heat the evaporation surface. The water inlet (19) is positioned relative to the evaporation surface (24) so that water is fed
Apparatus for generating steam is disclosed. It comprises a water inlet (19), an evaporation surface (24), and a heater (26) disposed adjacent to the evaporation surface to heat the evaporation surface. The water inlet (19) is positioned relative to the evaporation surface (24) so that water is fed onto the evaporation surface from the inlet (19) and forms a film on the evaporation surface such that said film is evaporated from the evaporation surface (24). The apparatus also has a scale collection region (23). The evaporation surface (24) and the scale collection region (23) are configured such that the scale collection region (23) is positioned below the evaporation surface (24) during use of the apparatus so that scale dislodged from the evaporation surface (24) and which falls away from the evaporation surface (24), drops into the scale collection region (23).
대표청구항▼
1. An apparatus for generating steam, the apparatus comprising: an evaporation surface;a heater disposed adjacent to the evaporation surface to heat the evaporation surface;a water inlet positioned relative to the evaporation surface so that a supply of water is fed onto the evaporation surface from
1. An apparatus for generating steam, the apparatus comprising: an evaporation surface;a heater disposed adjacent to the evaporation surface to heat the evaporation surface;a water inlet positioned relative to the evaporation surface so that a supply of water is fed onto the evaporation surface from the water inlet and forms a film of water on the evaporation surface such that (i) said film of water is evaporated from said evaporation surface heated via the heater to generate steam and (ii) impurities in the water that forms the film of water are left behind on said evaporation surface as scale;a scale collection region for collecting and retaining the scale left behind on said evaporation surface that becomes dislodged from the evaporation surface, wherein the scale collection region is adjacent to and distinct from the evaporation surface, where no evaporation of said film of water into the generated steam occurs,wherein the evaporation surface and the scale collection region adjacent to the evaporation surface are configured with the scale collection region positioned below the evaporation surface during use of the apparatus in an operational position, and wherein during use of the apparatus in the operational position, the scale that becomes dislodged from the evaporation surface (i) falls away from said evaporation surface, via force of gravity, and is dropped into and retained by the scale collection region or (ii) is pushed from said evaporation surface, via the film of water on the evaporation surface or by the steam being generated, into and retained by the scale collection region; anda scale collection chamber and a channel disposed such that when the apparatus is rotated from the operational position, in which the water is provided to the evaporation surface, into a rest position, in which the water is not provided to the evaporation surface, the scale that becomes dislodged from the evaporation surface will pass along said channel from said scale collection region and into said scale collection chamber which is configured to retain said scale. 2. The apparatus according to claim 1, further comprising a controller to control a flow of the water through the water inlet onto the evaporation surface in dependence on a temperature of the evaporation surface so that all, or substantially all, the water fed onto the evaporation surface is evaporated from said evaporation surface without flowing from the evaporation surface into the scale collection region. 3. The apparatus according to claim 1, wherein the scale collection region is at least partially isolated from the heater or remotely located from the heater so that the scale collection region is not heated or is heated to a lower temperature than said evaporation surface. 4. An apparatus for generating steam, comprising: an evaporation surface;a heater disposed adjacent to the evaporation surface to heat the evaporation surface;a water inlet positioned relative to the evaporation surface so that a supply of water is fed onto the evaporation surface from the water inlet and forms a film of water on the evaporation surface such that (i) said film of water is evaporated from said evaporation surface heated via the heater to generate steam and (ii) impurities in the water that forms the film of water are left behind on said evaporation surface as scale; anda scale collection region for collecting and retaining the scale left behind on said evaporation surface that becomes dislodged from the evaporation surface, wherein the scale collection region is adjacent to and distinct from the evaporation surface, where no evaporation of said film of water into the generated steam occurs,wherein the evaporation surface and the scale collection region adjacent to the evaporation surface are configured with the scale collection region positioned below the evaporation surface during use of the apparatus in an operational position, and wherein during use of the apparatus in the operational position, the scale that becomes dislodged from the evaporation surface (i) falls away from said evaporation surface, via force of gravity, and is dropped into and retained by the scale collection region or (ii) is pushed from said evaporation surface, via the film of water on the evaporation surface or by the steam being generated, into and retained by the scale collection region,wherein the scale collection region is at least partially isolated from the heater or remotely located from the heater so that the scale collection region is not heated or is heated to a lower temperature than said evaporation surface, andwherein the scale collection region is formed from a material which has a lower thermal conductivity than the evaporation surface. 5. The apparatus according to claim 3, wherein the scale collection region is insulated from the heater. 6. The apparatus of claim 1, further comprising a controller, wherein the controller controls a flow rate of the water supplied through the water inlet so that substantially all of the water that forms the film of water is evaporated on the evaporation surface and does not enter the scale collection region. 7. The apparatus of claim 1, further comprising a casing which defines a steam chamber, the evaporation surface being formed on an evaporation element which extends into the steam chamber from one side of the casing and the scale collection region being formed within the steam chamber, adjacent to the evaporation element. 8. The apparatus of claim 1, wherein the water inlet is configured to supply the water so that the water is fed onto two or more parts of the evaporation surface, simultaneously or alternately. 9. The apparatus of claim 1, wherein the evaporation surface comprises a curved or dome shaped profile. 10. The apparatus of claim 1, wherein the evaporation surface comprises one or more regions with recessed features. 11. The apparatus of claim 1, wherein the evaporation surface comprises a wall having varying thickness such that, when the evaporation surface is heated or cooled during use, thermal expansion will cause the size and/or shape of the evaporation surface to change in an irregular manner to dislodge scale from the evaporation surface. 12. The apparatus of claim 4, further comprising a scale collection chamber and a channel disposed such that when the apparatus is rotated from an operational position, in which the water is provided to the evaporation surface, into a rest position, in which the water is not provided to the evaporation surface, the scale that becomes dislodged from the evaporation surface will pass along said channel from said scale collection region and into said scale collection chamber which is configured to retain said scale. 13. A device for applying steam to an article, comprising the apparatus for generating steam according to claim 1. 14. A method of generating steam comprising the steps of: providing an apparatus having a water inlet, an evaporation surface and a heater disposed adjacent to the evaporation surface to heat the evaporation surface, the water inlet being positioned relative to the evaporation surface so that a supply of water is fed onto the evaporation surface from the inlet and forms a film of water on the evaporation surface such that (i) said film of water is evaporated from said evaporation surface heated via the heater to generate steam and (ii) impurities in the water that forms the film of water are left behind on said evaporation surface as scale;providing a scale collection region for collecting the scale left behind on said evaporation surface that becomes dislodged from the evaporation surface, wherein the scale collection region is adjacent to and distinct from the evaporation surface, where no evaporation of said film of water into the generated steam occurs, wherein the scale collection region is positioned below the evaporation surface during use of the apparatus in an operational position so that the scale that becomes dislodged from the evaporation surface (i) falls away from said evaporation surface, via force of gravity, and drops into said scale collection region or (ii) is pushed from said evaporation surface, via the film of water on the evaporation surface or by the steam being generated, into the scale collection region; andproviding a scale collection chamber and a channel disposed such that when the apparatus is rotated from the operational position, in which the water is provided to the evaporation surface, into a rest position, in which the water is not provided to the evaporation surface, the scale that becomes dislodged from the evaporation surface will pass along said channel from said scale collection region and into said scale collection chamber which is configured to retain said scale. 15. The method according to claim 14, further comprising the step of: controlling a flow of the water through the water inlet onto the evaporation surface in dependence on a temperature of the evaporation surface so that substantially all the water fed onto the evaporation surface is evaporated from said evaporation surface without flowing from the evaporation surface into the scale collection region.
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