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(11) |
EP 1 066 909 B1 |
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EUROPEAN PATENT SPECIFICATION |
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Mention of the grant of the patent: |
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13.04.2005 Bulletin 2005/15 |
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Date of filing: 03.07.2000 |
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A die-cast aluminium modular radiant element
Druckgegossenes modulares Heizelement für Radiatoren
Elément de chauffage modulaire coulé sous pression pour radiateurs
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Designated Contracting States: |
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AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
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Designated Extension States: |
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AL LT LV MK RO SI |
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Priority: |
06.07.1999 IT AN990035
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Date of publication of application: |
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10.01.2001 Bulletin 2001/02 |
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Proprietor: Gruppo Ragaini -S.P.A. |
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60025 Loreto (AN) (IT) |
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Inventor: |
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- Ragaini, Stefano
Loreto (AN) (IT)
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Representative: Baldi, Claudio |
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Piazza Ghislieri, 3
60035 Jesi (Ancona)
60035 Jesi (Ancona) (IT) |
| (56) |
References cited: :
EP-A- 0 816 791
US-A- 5 713 235
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US-A- 4 761 844
US-A- 5 733 078
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| Note: Within nine months from the publication of the mention of the grant of the European
patent, any person may give notice to the European Patent Office of opposition to
the European patent
granted. Notice of opposition shall be filed in a written reasoned statement. It shall
not be deemed to
have been filed until the opposition fee has been paid. (Art. 99(1) European Patent
Convention).
|
[0001] The present patent application relates to a die-cast aluminium modular radiant element
according to the preamble of claim 1, as for example known from EP-A-0 816 791. Such
an element is used in combination with identical elements to form the modular radiators
that are generally used in thermosiphon heating systems.
[0002] As it is known, modular radiant elements consist in a tubular column externally provided
with fins capable of favouring the thermal exchange between the hot water contained
in the radiator and the air that touches the external surface of the radiator.
[0003] An opposed pair of threaded hubs is provided on the top and the bottom of each column.
Connection nipples are screwed onto the hubs to join the adjacent pairs of radiant
elements, as well as to provide communication between the columns of the radiator.
[0004] The purpose of the present invention is to reduce the production cost of the said
die-cast aluminium modular radiant elements, by reducing the thickness of some parts
of the die-cast piece in order to recover aluminium, melt it and reuse it as die-casting
material.
[0005] Since the four hubs of each element need to be threaded, the same machine tool can
be used to internally mill the hubs in order to remove and recover the largest quantity
of aluminium possible, in compliance with mechanical resistance requirements.
[0006] During milling, the very internal section of the hub is enlarged to obtain a diameter
higher than the external threaded opening. The enlargement of the internal ending
section of the hub makes threading easier, since the tapping machine can penetrate
the hub, ending in the enlarged section. The use of a special tool allows for milling
and threading the hub in a sequence, when the tool moves backwards to exit the hub,
after penetrating inside it.
[0007] Finally, another advantage of the hub enlargement is represented by the reduction
of load losses.
[0008] For major clarity the description of the modular radiant element according to the
present invention continues with reference to the enclosed drawings, which are intended
for purposes of illustration and not in a limiting sense, whereby:
- Fig. 1 shows the ending section of the modular radiant element according to the invention,
sectioned with a plane passing through the axis of the two opposed hubs, in which
one hub is milled and threaded and the other hub is in die-cast state.
[0009] With reference to Fig. 1, the modular radiant element according to the invention
traditionally comprises a tubular column (1) externally provided with fins (2) capable
of favouring the thermal exchange between the hot water contained in the radiator
and the air that touches the external surface of the radiator.
[0010] An opposed pair of threaded hubs (3) is provided on the top and the bottom of the
tubular column (1). Connection nipples are screwed onto the hubs to join the columns
of the radiator, as well as to provide communication between them.
[0011] The modular radiant element according to the invention is characterised in that the
threaded opening (3a) of each hub (3) has an internal ending section (3b) with diameter
higher than the threaded opening (3a).
[0012] The section (3b) with increased diameter is obtained by placing the die-cast piece
in a machine tool to mill the internal section (3b) of the hub (3) and then thread
the opening (3a).
1. A die-cast aluminium modular radiant element for thermosiphon heating systems, of
the type comprising a tubular column (1) externally provided with fins (2) and with
an opposed pair of threaded hubs (3) on the top and the bottom, characterised in that the threaded opening (3a) of each hub (3) has an internal ending section (3b) with
diameter higher than the threaded opening (3a).
1. Modulares Heizelement aus Aluminiumdruckguss, das in Heißwasserheizanlagen verwendet
wird und eine rohrförmige Säule (1) umfasst, die außen mit Rippen (2) versehen ist
und an ihrer Oberseite sowie an ihrer Basis ein Paar gegenüberliegender Gewindenaben
(3) aufweist, dadurch gekennzeichnet, dass im Innern der Gewindeeinmündung (3a) einer jeden Nabe (3) ein Endabschnitt (3b) vorgesehen
ist, dessen Durchmesser größer als der Gewindeeinmündung (3a) ist.
1. Elément modulaire radiant en aluminium moulé sous pression, à utiliser dans les installations
de chauffage par radiateurs, du type comprenant une colonne tubulaire (1), dotée à
l'extérieur d'ailettes (2) et présentant, à son sommet et à sa base, une paire opposée
de moyeux filetés (3), caractérisé en ce qu'à l'intérieur de l'embouchure filetée (3a) de chaque moyeu (3), un segment terminal
(3b) de diamètre majeur de celui de l'embouchure filetée (3a) est prévu.