EP1488864A1 - Method to produce a steam boiler for a domestic appliance - Google Patents

Method to produce a steam boiler for a domestic appliance Download PDF

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Publication number
EP1488864A1
EP1488864A1 EP04102780A EP04102780A EP1488864A1 EP 1488864 A1 EP1488864 A1 EP 1488864A1 EP 04102780 A EP04102780 A EP 04102780A EP 04102780 A EP04102780 A EP 04102780A EP 1488864 A1 EP1488864 A1 EP 1488864A1
Authority
EP
European Patent Office
Prior art keywords
component
boiler
pellet
steam
domestic appliance
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.)
Withdrawn
Application number
EP04102780A
Other languages
German (de)
English (en)
French (fr)
Inventor
Antonio Lorenzon
Massimo Baldo
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.)
De Longhi SpA
Original Assignee
De Longhi SpA
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 De Longhi SpA filed Critical De Longhi SpA
Publication of EP1488864A1 publication Critical patent/EP1488864A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/20—Making uncoated products by backward extrusion
    • B21C23/205—Making products of generally elongated shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/24—Making hollow objects characterised by the use of the objects high-pressure containers, e.g. boilers, bottles

Definitions

  • the present invention concerns a method to produce a steam boiler for a domestic appliance, such as for example an iron, a steam cleaning device or suchlike.
  • the method according to the present invention comprises at least a cold extrusion step, by means of which, starting from pellets of substantially pure aluminum, the different parts that make up the boiler are made.
  • Boilers for the production of steam are known, which are associated with a domestic appliance such as for example an iron, a steam cleaning device or suchlike, substantially consisting of two hollow components coupled together, in airtight manner, so as to define a closed compartment into which the water to be evaporated is introduced.
  • Such known components can be, simply to give an example, either of the type with two half-shells, bolted or welded together, or of the type with a container hermetically closed by a mating cover.
  • a first type of boiler wherein the two components are made of stainless steel, made in a mold and welded together. Although such boilers are robust, they do have some disadvantages however, including low heat inertia, high energy consumption and high costs both of the raw material and also of the welding steps.
  • steel boilers of a known type have considerable difficulties due to their association with heating and control members. In fact, they need a further welding step, after molding, in order to attach elements able to allow the arrangement of control components and components to load the water.
  • boilers have been constructed consisting mainly or completely of aluminum components, made by means of pressure die-casting, with consequent high costs since, although the cost of the raw material used is lower, they need relatively long construction times.
  • One purpose of the present invention is to perfect a method to produce a steam boiler for a domestic appliance wherein the components of which it consists are made at least mostly of aluminum, but with production techniques that neither require a long time for working them nor consequent high costs.
  • the Applicant has devised, tested and embodied the present invention to overcome the shortcomings of the state of the art and to obtain this and other purposes and advantages.
  • the production method according to the present invention is applied to make a boiler of the type able to generate steam in a domestic appliance, comprising a first component and a second component, associated together so as to define a closed or airtight compartment, into which water to be made to evaporate is able to be introduced.
  • the method according to the present invention there is at least a first manufacturing step, wherein at least one of either the aforesaid first or second component is made by means of cold extrusion, advantageously starting from a pellet of substantially pure aluminum, that is, where the percentage of aluminum is at least equal to 99%.
  • Such cold extrusion provides at least a backward extrusion pass.
  • such extrusion is done by pressing the pellet, by means of a shaped punch, against a mating matrix. This pressure determines the deformation of the pellet itself and subsequent shaping thereof until the desired shape is achieved, defined by the punch and matrix.
  • the extrusion of the material also guarantees a good surface finishing of the parts and considerably reduces the times and costs of production, since it does not require any pre-heating or pre-forming of the aluminum pellet used to make each component.
  • Another advantage of the present invention is that, during extrusion, seatings can be made for further pressing of the resistance, seatings for possible connections, seatings for thermostats or otherwise, without having to perform any further working steps.
  • a method according to the present invention in this case is applied to make a boiler 10 able to generate steam in a small domestic appliance (not shown in the drawings), such as for example an iron, a cleaning apparatus or suchlike.
  • a small domestic appliance such as for example an iron, a cleaning apparatus or suchlike.
  • the boiler 10 comprises a container 11 shaped like a glass, substantially cylindrical and closed at the bottom, and a cover 12, able to close the open side of the container 11 in air-tight manner, so as to define a closed compartment 13 to contain the water.
  • the container 11 (fig. 2) comprises a lateral wall and a bottom wall 15 on which there are a central protuberance 16, able to cooperate with possible gripping means, of a known type and not shown in the drawings, and a radial abutment shaping 17 which allows to position the boiler 10 angularly with respect to the domestic appliance in which it is installed.
  • the cover 12 (fig. 3) comprises an axial pipe 19 to feed the water which extends towards the inside of the compartment 13 and, off-set, a second pipe 20 through which steam is discharged, parallel to the pipe 19, and extending instead towards the outside of the compartment 13.
  • the pipes 19 and 20 are able to be connected, in this case, respectively to water pumping means and steam delivery means, of a known type and not shown in the drawings, provided inside the domestic appliance.
  • the pipes 19 and 20 can be used irrespectively according to the design needs, to feed the water or to discharge the steam.
  • Both the container 11 and the cover 12 are made of substantially pure aluminum, that is, with a percentage of aluminum at least equal to 99%, advantageously between about 99.5% and 99.7%.
  • the method to produce the boiler 10 as described heretofore is as follows.
  • the container 11 is achieved by means of a process of backward cold extrusion using a punch 22 and a matrix 23, between which a pellet 21 of substantially pure aluminum, easily found on the market, is able to be placed.
  • the punch 22 has a lower surface 25 shaped so as to define a part of the profile of the container 11, whereas the matrix 23 has an upper surface 26 shaped so as to define a complementary part of the profile of the container 11.
  • the cover 12 is made in the same way, as shown in figs. 6a, 6b and 6c.
  • a pellet 121 is used, also made of substantially pure aluminum, provided with a through hole 30.
  • a punch 122 is provided on its lower surface 125 with a pin 27, able to be inserted into the mating through hole 30.
  • the steam outlet pipe 20 is made, instead, in a subsequent shaving removal step.
  • Both the container 11 and the cover 12 are then removed from the respective matrixes 23, 123 and coupled together, for example by means of welding, so as to form the boiler 10 shown in fig. 1.
  • the boiler indicated in its entirety by the reference number 110, comprises two half-shells, respectively lower 111 and upper 112, also made in the same way as the container 11 and the cover 12, by means of a backward cold extrusion pass starting from a pellet of substantially pure aluminum.
  • the lower half-shell 111 and the upper half-shell 112 are substantially cylindrical in shape and are substantially of the same size, so as to constitute the two halves of the boiler 110.
  • the upper half-shell 112 has a pipe 119 through which water is introduced and, as in the previous case, the pellet from which it is made has a hole into which a relative pin provided on the punch is inserted (not shown here).
  • the shaped surfaces 25, 125 and 26, 126 can be made on suitably shaped elements able to be selectively associated with the punch 22, 122 or the matrix 23, 123, so that such surfaces 25, 125 and 26, 126 can be deliberately interchanged according to the component 11, 111, 12 or 112 to be made.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
EP04102780A 2003-06-19 2004-06-17 Method to produce a steam boiler for a domestic appliance Withdrawn EP1488864A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUD20030134 2003-06-19
ITUD20030134 ITUD20030134A1 (it) 2003-06-19 2003-06-19 Procedimento per produrre una caldaia a vapore per un elettrodomestico.

Publications (1)

Publication Number Publication Date
EP1488864A1 true EP1488864A1 (en) 2004-12-22

Family

ID=33398095

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04102780A Withdrawn EP1488864A1 (en) 2003-06-19 2004-06-17 Method to produce a steam boiler for a domestic appliance

Country Status (2)

Country Link
EP (1) EP1488864A1 (it)
IT (1) ITUD20030134A1 (it)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH341465A (fr) * 1955-09-23 1959-10-15 Crittall Luxfer Limited Procédé d'extrusion à froid de sections métalliques
US3174321A (en) * 1958-09-15 1965-03-23 Olin Mathieson Connecting device
US3604586A (en) * 1967-04-14 1971-09-14 Orszagos Koolaj Gazipari Cartridges containing carbon-dioxide for household purposes
DE2719948A1 (de) * 1977-05-04 1978-11-09 Maschf Augsburg Nuernberg Ag Verfahren zur herstellung von zylindrischen druckbehaeltern
WO1996011759A1 (en) * 1994-10-13 1996-04-25 British Aluminium Holdings Limited Treating pressure vessels
WO1997048947A1 (en) * 1996-06-18 1997-12-24 Tsp Medical Ab Steam generator

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH341465A (fr) * 1955-09-23 1959-10-15 Crittall Luxfer Limited Procédé d'extrusion à froid de sections métalliques
US3174321A (en) * 1958-09-15 1965-03-23 Olin Mathieson Connecting device
US3604586A (en) * 1967-04-14 1971-09-14 Orszagos Koolaj Gazipari Cartridges containing carbon-dioxide for household purposes
DE2719948A1 (de) * 1977-05-04 1978-11-09 Maschf Augsburg Nuernberg Ag Verfahren zur herstellung von zylindrischen druckbehaeltern
WO1996011759A1 (en) * 1994-10-13 1996-04-25 British Aluminium Holdings Limited Treating pressure vessels
WO1997048947A1 (en) * 1996-06-18 1997-12-24 Tsp Medical Ab Steam generator

Also Published As

Publication number Publication date
ITUD20030134A1 (it) 2004-12-20

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