EP4283191A1 - Générateur de vapeur comprenant une surface de vaporisation adaptée - Google Patents

Générateur de vapeur comprenant une surface de vaporisation adaptée Download PDF

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Publication number
EP4283191A1
EP4283191A1 EP22175354.4A EP22175354A EP4283191A1 EP 4283191 A1 EP4283191 A1 EP 4283191A1 EP 22175354 A EP22175354 A EP 22175354A EP 4283191 A1 EP4283191 A1 EP 4283191A1
Authority
EP
European Patent Office
Prior art keywords
protrusions
arrangement
steam generator
sub
steam
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.)
Pending
Application number
EP22175354.4A
Other languages
German (de)
English (en)
Inventor
Prakash SUBRAMANIAN SHANMUGASUNDARAM
Yong Teck Yang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Versuni Holding BV
Original Assignee
Versuni Holding BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Versuni Holding BV filed Critical Versuni Holding BV
Priority to EP22175354.4A priority Critical patent/EP4283191A1/fr
Priority to CN202380012784.7A priority patent/CN117651828A/zh
Priority to PCT/EP2023/063822 priority patent/WO2023227618A1/fr
Priority to EP23729663.7A priority patent/EP4341610A1/fr
Priority to KR1020247002748A priority patent/KR20240017962A/ko
Publication of EP4283191A1 publication Critical patent/EP4283191A1/fr
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
    • F22B1/284—Methods of steam generation characterised by form of heating method in boilers heated electrically with water in reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
    • F22B1/287—Methods of steam generation characterised by form of heating method in boilers heated electrically with water in sprays or in films
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
    • F22B1/288—Instantaneous electrical steam generators built-up from heat-exchange elements arranged within a confined chamber having heat-retaining walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/60—Component parts or details of steam boilers specially adapted for steam boilers of instantaneous or flash 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
    • D06F75/00—Hand irons
    • D06F75/08—Hand irons internally heated by electricity
    • D06F75/10—Hand irons internally heated by electricity with means for supplying steam to the article being ironed
    • D06F75/12—Hand irons internally heated by electricity with means for supplying steam to the article being ironed the steam being produced from water supplied to the iron from an external source

Definitions

  • the invention relates to a steam generator for a garment care device, and a garment care device comprising the steam generator.
  • the invention may be used in the field of garment care.
  • Steam generators vaporise water to generate steam.
  • a water inlet is provided for dosing water into the steam generator, and a steam outlet permits steam to exit the steam generator.
  • Various types of garment care device which include a steam generator, such as so-called stand steamers.
  • stand steamers typically include a base unit, a hand unit having at least one steam vent, and a steam hose cord connecting the steam generator in the base unit to the hand unit.
  • Conventional steam generators have a heated steaming surface to which water is supplied in order to generate steam. It can be desirable to shorten the length of the steaming surface in order to make the steam generator, and thus the base unit in the case of the above-mentioned stand steamer, more compact. However, this can risk undesirable pooling of water at the bottom of the steaming surface.
  • Steam generator temperatures also tend to be relatively high, such as above 150°C. Such high temperatures can result in film boiling of water on the steaming surface, also known as the Leidenfrost effect. This can compromise the capability of the steam generator to generate steam instantaneously.
  • Scale build-up on the steaming surface can also cause steaming performance to decline over the operating lifetime of the steam generator.
  • the more scale remains adhered to the steaming surface the worse the instantaneous steam generation capability of the steam generator becomes, due to the adhered scale making heat transfer from the steaming surface to the water thereon less efficient.
  • the steam generator according to the invention comprises
  • truncated in the context of the truncated pyramidal shape of the protrusions of the first sub-arrangement may refer to a pyramidal shape having its apex (distal to the base of the pyramidal shape at the steaming surface) removed as a result of the truncation.
  • This truncated pyramidal shape can assist to promote regular flaking-off of scale deposited on the first portion of the steaming surface.
  • the truncated pyramidal shape can also, in certain embodiments, assist to minimise flaking off of a coating, in particular a steam promoter coating, from the first portion of the steaming surface.
  • pyramidal shape of the protrusions of the second sub-arrangement may mean that the pyramidal shape comprises its apex distal to the base of the pyramidal shape at the steaming surface.
  • each of the protrusions of the second sub-arrangement has a non-truncated pyramidal shape.
  • This (non-truncated) pyramidal shape can assist with retaining/obstructing relatively large amounts of water and scale on the second portion of the steaming surface, thereby assisting to minimise or avoid water reaching and pooling at a base of the steam generator.
  • each of the protrusions has a base having opposite corners parallel to the first direction.
  • the opposite corners are spaced apart from each other along an axis parallel to the first direction of extension of the steaming surface from the water inlet.
  • Orientation of the protrusions in this manner may assist lateral/transverse water spreading on the steaming surface, and thereby assist to enhance steaming efficiency.
  • the protrusions of the first sub-arrangement are more densely arranged than the protrusions of the second sub-arrangement. This may mean greater water spreading, and slower passage of the water in the first direction, on the first portion of the steaming surface.
  • the lower density of the protrusions in the second sub-arrangement enables more efficient flaking-off of scale from the second portion of the steaming surface which may assist to minimise scale build-up on the second portion of the steaming surface.
  • a coating is provided on and between the protrusions.
  • the protrusions can provide a greater surface area to which the coating can adhere.
  • the risk of delamination, e.g. bulk delamination, of the coating can be reduced, for example in comparison with such a coating being applied to a flat steaming surface without any protrusions.
  • the coating is preferably adapted or selected to suppress film boiling of the water supplied to the steaming surface.
  • the coating which can be termed a "steam promoter coating" in view of its film boiling suppression purpose, can be hydrophilic and/or porous.
  • the second portion has an angular orientation compared to horizontal being larger than an angular orientation compared to horizontal of the first portion.
  • This arrangement has been found to permit more efficient flaking and dropping of scale from the steaming surface to enable scale to accumulate in a scale deposition area at the base of the steam generator. This, in turn, may assist to prolong the instantaneous steam generation capability of the steam generator, since less scale adhered to the steaming surface may mean that heat is more efficiently transferred to the water thereon.
  • the protrusions of the second sub-arrangement preferably project further away from the steaming surface than the protrusions of the first sub-arrangement.
  • the height of each of the protrusions of the second sub-arrangement is greater than the height of each of the protrusions of the first sub-arrangement.
  • This may assist in retention and/or obstruction of water and scale on the second portion, and may assist to minimise the amount of water reaching and pooling in the base of the steam generator.
  • the arrangement of protrusions comprises rows of protrusions, with each row extending transverse to the first direction.
  • the protrusions of a given row are preferably aligned with the spaces between protrusions of a neighbouring row such that the rows are staggered along the first direction.
  • staggered rows can assist to enhance lateral/transverse water spreading on the steaming surface, and thereby assist to enhance steaming efficiency.
  • portions of the protrusions of one row of a pair of neighbouring rows align with portions of the protrusions of the other row of the pair of neighbouring rows such that the neighbouring rows partially overlap with each other along the first direction.
  • the protrusions can be more densely arranged, with the concomitant increase in surface area assisting to enhance steaming efficiency.
  • the steaming surface comprises a rounded transition between the first portion and the second portion.
  • a rounded transition coupled with larger angular orientation of the second portion may assist to ensure smooth transfer of the water on the first portion to the second portion.
  • a radius of curvature of the rounded transition is preferably in the range of [20;40] mm. Such a radius of curvature may be large enough to assist water reaching the end of the first portion to continue to flow down the second portion due to surface tension instead of "falling-off', and descending directly into the base of the steam generator by gravity. This radius of curvature is also not so large so as to overly reduce the available steaming area of the first portion.
  • a height of each of the protrusions is in the range of [0.3;1.3] mm.
  • a height of the protrusions of the first sub-arrangement is preferably in the range of [0.3;0.8] mm. This has been found to balance sufficient slowing/spreading of water on the first portion with scale flaking efficacy and/or coating adhesion.
  • a height H of the protrusions of the second sub-arrangement is preferably in the range of [0.8;1.3] mm. This has been found to balance sufficient slowing/spreading of water on the second portion with scale flaking efficacy and/or coating adhesion.
  • the protrusions may each have a base area on the steaming surface in the range of [2;6] mm 2 .
  • each of the protrusions at its base is preferably in the range of [1.4;2.5] mm.
  • a first distance between corresponding points, for example respective centres, of nearest neighbouring protrusions of the first sub-arrangement when measured in a second direction perpendicular to the first direction is preferably in the range [2.2;3.0] mm.
  • a second distance between corresponding points, for example respective centres, of nearest neighbouring protrusions of the first sub-arrangement when measured in the first direction may be in the range [1.7;2.5] mm.
  • a further first distance between corresponding points, for example respective centres, of nearest neighbouring protrusions of the second sub-arrangement when measured in the second direction perpendicular to the first direction is preferably in the range of [2.2;3.0] mm.
  • a further second distance between corresponding points, for example respective centres, of nearest neighbouring protrusions of the second sub-arrangement when measured in the first direction may be in the range of [1.7;4.0] mm.
  • a garment care device comprising
  • the hand unit further comprises a steam heater arranged to re-heat the steam received from the steam generator, prior to the steam exiting the hand unit via the at least one steam vent.
  • the steam heater may assist to minimise the risk of spitting of water onto garments.
  • Figs. 1A and 1B depict a garment care device 100 according to an example.
  • the garment care device 100 comprises a base unit 102 comprising a steam generator (not visible in Figs.1A and 1B ).
  • the design of the steam generator will be described in more detail herein below.
  • the garment care device 100 also comprises a hand unit 104. At least one steam vent (not visible in the Figures) is provided in the hand unit 104 for releasing steam to a garment to be treated.
  • a steam hose cord 106 connects the steam generator to the hand unit 104.
  • the steam generated by the steam generator exits the device via the at least one steam vent.
  • the garment care device 100 shown in Figs.1A and 1B can be regarded as a stand steamer.
  • the garment care device 100 comprises an ironing board 108 which is tiltable between a vertical orientation, as shown in Fig.1A and represented by the dotted lines 110 in Fig.1B , and a horizontal orientation, as shown in Fig.1B .
  • the hand unit 104 further comprises a steam heater (not visible in the Figures) arranged to re-heat the steam received from the steam generator, prior to the steam exiting the hand unit 104 via the at least one steam vent.
  • the steam heater may assist to minimise the risk of spitting of water onto the garment being treated.
  • the garment care device 100 includes a holder 112 for supporting the hand unit 104 while the hand unit 104 is not being held by the user.
  • a holder 112 can be mounted on the ironing board 108, as shown.
  • Figs.2A and 2B depict a steam generator 120 according to an example.
  • the steam generator 120 can, for example, be included in the above-described base unit 102 of the garment care device 100 shown in Figs.1A and 1B .
  • the steam generator 120 comprises a steam generator body 122 comprising a steaming surface 124.
  • the steam generator body 122 can be formed from any suitable material capable of withstanding steam generation on the steaming surface 124.
  • the steam generator body 122 is formed from a metal material, such as aluminium.
  • the steam generator body 122 is formed, at least in part, via a casting, for example die-casting, process.
  • the steam generator body 122 is formed from die-cast aluminium.
  • the steam generator 120 comprises a steam generator cover 123 which joins to the steam generator body 122 to enclose a steam chamber 125.
  • the steaming surface 124 is provided in the steam chamber 125.
  • the steam generator cover 123 can be formed from any suitable material capable of withstanding steam generation in the steam chamber 125.
  • the steam generator cover 123 is formed from a metal material, such as aluminium.
  • the steam generator cover 123 is formed, at least in part, via a casting, for example die-casting, process.
  • the steam generator cover 123 is formed from die-cast aluminium.
  • Joining of the steam generator cover 123 and the steam generator body 122 can be achieved in any suitable manner, such as using one or more screws SC.
  • Water is supplied towards the steaming surface 124 via a water inlet 128.
  • the water is then vaporised on the steaming surface 124 to generate steam.
  • a heating element arrangement (not visible in the Figures) is preferably arranged in the steam generator body 122 to heat the steaming surface 124 so that the water can be vaporised thereon.
  • the water inlet 128 is provided in the steam generator cover 123. In other examples (not shown), the water inlet 128 is provided in the steam generator body 122.
  • a steam outlet 129 is provided in the steam generator cover 123.
  • the steam outlet 129 is arranged to deliver outside the steam chamber 125 steam generated in the steam chamber 125.
  • the steam outlet 129 is provided in the steam generator body 122.
  • the steam generator 120 comprises an arrangement of spatially separated protrusions 126 projecting away from the steaming surface 124. This arrangement of protrusions 126 can provide various benefits, as explained in more detail herein below.
  • the protrusions 126 form part of the steam generator body 122.
  • the protrusions 126 are necessarily made of the same material, for example the same metal material, e.g. aluminium, as the rest of the steam generator body 122.
  • the protrusions 126 can be formed in any suitable manner, for example by being formed together with the rest of the steam generator body 122 in a casting process, such as a die-casting process.
  • the steam generator body 122, including the protrusions 126 is formed from die-cast aluminium.
  • a coating 130 is provided on and between the protrusions 126.
  • the protrusions 126 can provide a greater surface area to which the coating 130 can adhere.
  • the risk of delamination, e.g. bulk delamination, of the coating 130 from the surface of the steam generator body 122 can be reduced, for example in comparison with such a coating being applied to a flat steaming surface without protrusions.
  • the coating 130 conforms to the arrangement of spatially separated protrusions 126.
  • the coating 130 may be thinner than the height H of projection of the protrusions 126 away from the surface of the steam generator body 122, such that the surface of the coating 130 follows the contours provided by the arrangement of protrusions 126.
  • surface area of the coating 130 may be increased, for example relative to a flat coating surface. This, in turn, can assist to improve efficiency of water vaporisation on the surface of the coating 130.
  • the thickness T of the coating 130 is preferably in the range of [10;60] ⁇ m.
  • the height H of each of the protrusions 126 is in the range of [0.3;1.3] mm.
  • the protrusions 126 may each have a base area on the steaming surface 124 in the range of [2;6] mm 2 .
  • the width W of each of the protrusions 126 at its base is preferably in the range of [1.4;2.5] mm.
  • the coating 130 is preferably adapted or selected to suppress film boiling of the water supplied to the steaming surface 124.
  • the coating 130 which can be termed a "steam promoter coating" in view of its film boiling suppression purpose, is preferably hydrophilic and/or porous.
  • the coating 130 comprises an alkali metal silicate.
  • the coating 130 comprises an alkali metal silicate and a polysaccharide.
  • Xylan is an example of a polysaccharide suitable for inclusion in the coating 130.
  • the coating 130 comprises an alkali metal silicate compound, and boron, preferably a salt of boron with a metallic element.
  • a coating 130 comprising an alkali metal silicate compound and boron is described in, for instance, WO 2009/044320 A2 .
  • the coating 130 comprises a polysaccharide, an alkali metal silicate compound, and a salt of boron with a metallic element.
  • the coating 130 may be applied in any suitable manner, for instance by spraying a precursor layer, e.g. in the form of a sol, onto and between the protrusions 126, and curing the thus applied precursor layer, e.g. to form a sol-gel-type coating 130.
  • the curing may be implemented thermally, for instance using a particular heating profile to cure the precursor layer.
  • the arrangement of protrusions 126 Prior to the coating 130 being applied, e.g. prior to application of the precursor layer, the arrangement of protrusions 126 is preferably cleaned to remove contaminants, and then subjected to abrasive blasting, e.g. sand blasting, to prepare the protrusions 126 and the surface therebetween for the coating 130.
  • abrasive blasting e.g. sand blasting
  • the steaming surface 124 extends away from the water inlet 128 in a first direction D1.
  • the steaming surface 124 is elongated so as to have a lengthways dimension, with this lengthways dimension extending parallel to the first direction D1. An example of this is shown in Fig.2B .
  • the steaming surface 124 comprises a first portion 124A proximal to the water inlet 128, and a second portion 124B extending from the first portion 124A in the first direction D1.
  • This arrangement means that the water supplied via the water inlet 128 flows on the steaming surface 124 from the first portion 124A to the second portion 124B.
  • the first portion 124A may thus be regarded as an upstream portion of the steaming surface 124, with the second portion 124B being a downstream portion of the steaming surface 124.
  • the arrangement of protrusions 126 comprises rows 132 of protrusions 126, with each row 132 extending transverse to the first direction D1.
  • Each row 132 preferably extends in second directions D2 perpendicular to the first direction D1.
  • the protrusions 126 of a given row 132 are preferably aligned with the spaces between protrusions 126 of a neighbouring row 132 such that the rows are staggered along the first direction D1.
  • staggered rows 132 can assist to enhance lateral/transverse water spreading on the steaming surface 124, and thereby assist to enhance steaming efficiency.
  • portions of the protrusions 126 of one row 132A of a pair of neighbouring rows 132A, 132B preferably align with portions of the protrusions 126 of the other row 132B of the pair of neighbouring rows 132A, 132B such that the neighbouring rows 132A, 132B partially overlap with each other along the first direction D1.
  • the protrusions 126 can be more densely arranged, with the concomitant increase in surface area assisting to enhance steaming efficiency.
  • Other benefits which may be provided by more densely arranged protrusions 126 will be described herein below.
  • the arrangement of spatially separated protrusions 126 comprises a first sub-arrangement of protrusions 126A projecting from the first portion 124A, and a second sub-arrangement of protrusions 126B projecting from the second portion 124B.
  • the protrusions 126A of the first sub-arrangement are more densely arranged than the protrusions 126B of the second sub-arrangement. This may mean greater water spreading, and slower passage of the water in the first direction D1, on the first portion 124A of the steaming surface 124.
  • the lower density of the protrusions 126B in the second sub-arrangement may assist to minimise scale build-up on the second portion 124B of the steaming surface 124.
  • the heating element arrangement is preferably arranged relative to the first portion 124A and the second portion 124B such that the first portion 124A is at a higher temperature than the second portion 124B.
  • each of the protrusions 126A of the first sub-arrangement has a truncated pyramidal shape.
  • truncated in the context of the truncated pyramidal shape may refer to a pyramidal shape having its apex (distal to the base of the pyramidal shape at the steaming surface 124) removed as a result of the truncation.
  • This truncated pyramidal shape can assist to promote regular flaking off of scale deposited on the first portion 124A of the steaming surface 124.
  • the truncated pyramidal shape can also, in certain embodiments, assist to minimise flaking off of the coating 130 from the first portion 124A of the steaming surface 124.
  • the truncated pyramidal shape of the protrusions 126A of the first sub-arrangement is a truncated square pyramidal shape
  • this is not intended to be limiting and other truncated pyramidal shapes can be contemplated, for instance a truncated pyramidal shape whose base is a quadrilateral being a rectangle, a trapezium, a rhombus or a kite.
  • a height H of the protrusions 126A of the first sub-arrangement is in the range of [0.3;0.8] mm. This has been found to balance sufficient slowing/spreading of water on the first portion 124A with scale flaking efficacy and/or coating 130 adhesion.
  • each of the protrusions 126B of the second sub-arrangement has a pyramidal shape.
  • pyramidal shape of the protrusions 126B of the second sub-arrangement is intended to mean that the pyramidal shape comprises its apex AP distal to the base of the pyramidal shape at the steaming surface 124.
  • each of the protrusions 126B of the second sub-arrangement has a non-truncated pyramidal shape.
  • This (non-truncated) pyramidal shape can assist with retaining/obstructing relatively large amounts of water and scale on the second portion 124B, thereby assisting to minimise or avoid water reaching and pooling at a base of the steam chamber 125.
  • the pyramidal shape of the protrusions 126B of the second sub-arrangement is a pyramidal shape whose base is kite-shaped, this is not intended to be limiting and other pyramidal shapes can be contemplated, for instance a pyramidal shape whose base is a quadrilateral being a square (see the example shown in Fig.8 ), a rectangle, a trapezium, or a rhombus.
  • a height H of the protrusions 126B of the second sub-arrangement is in the range of [0.8;1.3] mm. This has been found to balance sufficient slowing/spreading of water on the second portion 124B with scale flaking efficacy and/or coating 130 adhesion.
  • the protrusions 126B of the second sub-arrangement preferably project further away from the steaming surface 124 than the protrusions 126A of the first sub-arrangement.
  • the height H of each of the protrusions 126B of the second sub-arrangement is greater than the height H of each of the protrusions 126A of the first sub-arrangement. This may assist in retention and/or obstruction of water and scale on the second portion 124B, and may assist to minimise the amount of water reaching and pooling in the base of the steam chamber 125.
  • each of the protrusions 126 has a base having opposite corners C1, C2 parallel to the first direction D1.
  • the opposite corners C1, C2 are spaced apart from each other along an axis parallel to the first direction D1. Orientation of the protrusions 126 in this manner may assist lateral/transverse water spreading on the steaming surface 124, and thereby assist to enhance steaming efficiency.
  • Fig.6 provides another plan view of the protrusions 126A of the first sub-arrangement.
  • a first distance SP1A between corresponding points, for example respective centres, of nearest neighbouring protrusions 126A of the first sub-arrangement when measured in the second direction D2 perpendicular to the first direction D1 is preferably in the range [2.2;3.0] mm.
  • a second distance SP2A between corresponding points, for example respective centres, of nearest neighbouring protrusions 126A of the first sub-arrangement when measured in the first direction D1 may be in the range [1.7;2.5] mm.
  • Fig.7 provides another plan view of the protrusions 126B of the second sub-arrangement.
  • a further first distance SP1B between corresponding points of nearest neighbouring protrusions 126B of the second sub-arrangement when measured in the second direction D2 perpendicular to the first direction D1 is preferably in the range of [2.2;3.0] mm.
  • a further second distance SP2B between corresponding points of nearest neighbouring protrusions 126B of the second sub-arrangement when measured in the first direction D1 may be in the range of [1.7;4.0] mm, and preferably in the range of [2.8;4] mm for the kite-shaped based pyramidal protrusions 126B shown in Fig.7 .
  • the further second distance SP2B in the case of the square based pyramidal protrusions 126B shown in Fig.8 is preferably in the range of [1.7;2.5] mm.
  • the second portion 124B has an angular orientation A2 compared to the horizontal HP being larger than an angular orientation A1 compared to the horizontal HP of the first portion 124A.
  • Fig.9 shows the steam generator 120 when orientated for use.
  • This in-use orientation of the steam generator 120 may, for example, be adopted when the steam generator 120 is mounted in the base unit 102 of the garment care device 100, and the base unit 102 itself is orientated for use.
  • This arrangement has been found to permit more efficient flaking and dropping of scale from the steaming surface 124 to enable scale to accumulate in a scale deposition area at the base of the steam chamber 125. This, in turn, may assist to prolong the instantaneous steam generation capability of the steam generator 120, since less scale adhered to the steaming surface 124 may mean that heat is more efficiently transferred to the water thereon.
  • the steam generator 120 is preferably oriented such that the first portion 124A is inclined at an incline angle A1, for example at an incline angle in the range of [45;75] degrees, such as about 60 degrees, with respect to the horizontal plane HP in an anti-clockwise direction.
  • the second portion 124B is inclined at an incline angle A2 in the range of [50;80] degrees, such as about 65 degrees, with respect to the horizontal plane HP in a clockwise direction.
  • the incline angle A2 of the second portion 124B is preferably equal to or greater than the incline angle A1 of the first portion 124A.
  • horizontal plane HP may be defined perpendicular to the local gravity direction-defined vertical.
  • a rounded transition R is provided between the first portion 124A and the second portion 124B. Such a rounded transition may assist to ensure smooth transfer of the water on the first portion 124A to the second portion 124B.
  • a radius of curvature of the rounded transition R is preferably in the range of [20;40] mm. Such a radius of curvature may be large enough to assist water reaching the end of the first portion 124A to continue to flow down the second portion 124B due to surface tension instead of "falling-off', and descending directly into the base of the steam chamber 125 by gravity. This radius of curvature is also not so large so as to overly reduce the available steaming area of the first portion 124A.
  • the steaming surface 124 further comprises a third portion 124C extending from the second portion 124B in the first direction D1.
  • the third portion 124C is preferably parallel to, or at least substantially parallel to, the first portion 124A.
  • the third portion 124C may form part of a scale collection area at the base of the steam chamber 125.
  • Part of the heating element arrangement is preferably aligned with the third portion 124C to assist in vaporising, in other words steaming-off, of any water reaching the base of the steam chamber 125 to prevent pooling.
  • the performance of various steam generators 120 was evaluated. Each had the same basic architecture, namely that shown in Figs.2A, 2B and 9 .
  • the steaming surface 124 of each of the steam generators 120 included the first portion 124A, the second portion 124B, and the third portion 124C.
  • the steam generators 120 were each orientated as shown in Fig.9 , with the incline angle A1 of the first portion 124A being 60 degrees, the incline angle A2 of the second portion 124B being 65 degrees, and the third portion 124C being parallel to the first portion 124A.
  • each of the protrusions 126B of the second sub-arrangement had the (non-truncated) pyramidal shape, since this was found to be particularly effective at retaining/obstructing relatively large amounts of water and scale on the second portion 124B, thereby assisting to minimise or avoid water reaching the third portion 124C and pooling at the base of the steam chamber 125.
  • These pyramidal protrusions 126B each has a base area of 2 mm 2 , and a height H of 1 mm.
  • the SP1B is 2.6 mm
  • the SP2B is 2.1 mm.
  • Table 1 provides details of the protrusions 126A of the first sub-arrangements used, together with observations from testing the steam generators 120 using hard water (B160), and using soft water (SG).
  • the hard water was to test scale flaking performance.
  • the soft water was to test steam promoter coating 130 flaking behaviour and water spreading.
  • the more densely arranged protrusions 126A of Ex. 2 resulted in no flaking of the steam promoter coating 130. This is thought to be due to the greater surface area of the first portion 124A due to the more densely arranged protrusions 126A of the first sub-arrangement. Moreover, the more densely arranged protrusions 126A of Ex. 2 were observed to result in wider lateral/transverse water spreading than the less densely arranged protrusions 126A of Ex. 4.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
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EP22175354.4A 2022-05-25 2022-05-25 Générateur de vapeur comprenant une surface de vaporisation adaptée Pending EP4283191A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP22175354.4A EP4283191A1 (fr) 2022-05-25 2022-05-25 Générateur de vapeur comprenant une surface de vaporisation adaptée
CN202380012784.7A CN117651828A (zh) 2022-05-25 2023-05-23 包括调适的蒸汽表面的蒸汽发生器
PCT/EP2023/063822 WO2023227618A1 (fr) 2022-05-25 2023-05-23 Générateur de vapeur comprenant une surface de traitement à la vapeur adaptée
EP23729663.7A EP4341610A1 (fr) 2022-05-25 2023-05-23 Générateur de vapeur comprenant une surface de traitement à la vapeur adaptée
KR1020247002748A KR20240017962A (ko) 2022-05-25 2023-05-23 적응식 스티밍 표면을 포함한 스팀 발생기

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22175354.4A EP4283191A1 (fr) 2022-05-25 2022-05-25 Générateur de vapeur comprenant une surface de vaporisation adaptée

Publications (1)

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EP4283191A1 true EP4283191A1 (fr) 2023-11-29

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EP22175354.4A Pending EP4283191A1 (fr) 2022-05-25 2022-05-25 Générateur de vapeur comprenant une surface de vaporisation adaptée
EP23729663.7A Pending EP4341610A1 (fr) 2022-05-25 2023-05-23 Générateur de vapeur comprenant une surface de traitement à la vapeur adaptée

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP23729663.7A Pending EP4341610A1 (fr) 2022-05-25 2023-05-23 Générateur de vapeur comprenant une surface de traitement à la vapeur adaptée

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EP (2) EP4283191A1 (fr)
KR (1) KR20240017962A (fr)
CN (1) CN117651828A (fr)
WO (1) WO2023227618A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4990745A (en) * 1988-06-15 1991-02-05 Black & Decker Inc. Steam generators
DE20120527U1 (de) * 2000-12-22 2002-03-07 Rowenta Werke Gmbh Sofortdampferzeuger
US6615515B1 (en) * 2002-05-21 2003-09-09 Eupa International Corporation Steam iron with a horizontal partition movable vertically within a steam generating chamber
WO2009044320A2 (fr) 2007-10-05 2009-04-09 Koninklijke Philips Electronics N.V. Dispositif générant de la vapeur pourvu d'un revêtement hydrophile
WO2018007746A1 (fr) * 2016-07-07 2018-01-11 Seb S.A. Fer a vapeur pourvu d'un dispositif de retenue de gouttelettes d'eau
US10604888B2 (en) * 2016-12-13 2020-03-31 Seb S.A. Steam ironing apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4990745A (en) * 1988-06-15 1991-02-05 Black & Decker Inc. Steam generators
DE20120527U1 (de) * 2000-12-22 2002-03-07 Rowenta Werke Gmbh Sofortdampferzeuger
US6615515B1 (en) * 2002-05-21 2003-09-09 Eupa International Corporation Steam iron with a horizontal partition movable vertically within a steam generating chamber
WO2009044320A2 (fr) 2007-10-05 2009-04-09 Koninklijke Philips Electronics N.V. Dispositif générant de la vapeur pourvu d'un revêtement hydrophile
WO2018007746A1 (fr) * 2016-07-07 2018-01-11 Seb S.A. Fer a vapeur pourvu d'un dispositif de retenue de gouttelettes d'eau
US10604888B2 (en) * 2016-12-13 2020-03-31 Seb S.A. Steam ironing apparatus

Also Published As

Publication number Publication date
WO2023227618A1 (fr) 2023-11-30
KR20240017962A (ko) 2024-02-08
CN117651828A (zh) 2024-03-05
EP4341610A1 (fr) 2024-03-27

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