EP1004832A2 - Elektrischer Flüssigkeitserhitzer, insbesondere für Farben - Google Patents

Elektrischer Flüssigkeitserhitzer, insbesondere für Farben Download PDF

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Publication number
EP1004832A2
EP1004832A2 EP99122745A EP99122745A EP1004832A2 EP 1004832 A2 EP1004832 A2 EP 1004832A2 EP 99122745 A EP99122745 A EP 99122745A EP 99122745 A EP99122745 A EP 99122745A EP 1004832 A2 EP1004832 A2 EP 1004832A2
Authority
EP
European Patent Office
Prior art keywords
heater
fluid
exchanger
heating body
heating
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.)
Granted
Application number
EP99122745A
Other languages
English (en)
French (fr)
Other versions
EP1004832B1 (de
EP1004832A3 (de
Inventor
Edo Giardini
Angelo Basso
Ernestino Landi
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.)
Wagner Colora SRL
Original Assignee
Wagner Colora SRL
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 Wagner Colora SRL filed Critical Wagner Colora SRL
Publication of EP1004832A2 publication Critical patent/EP1004832A2/de
Publication of EP1004832A3 publication Critical patent/EP1004832A3/de
Application granted granted Critical
Publication of EP1004832B1 publication Critical patent/EP1004832B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/12—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium
    • F24H1/121—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium using electric energy supply

Definitions

  • the invention relates to an electric heater for fluids, in particular paints, of the type comprising a heating body, provided with electric heating elements, and a duct for circulation of the fluid to be heated, arranged to receive heat from the heating body. Fluid heating takes place while the fluid is running through said duct between a fluid inlet and a fluid outlet, each provided with connection fittings in particular for flexible fluid-conveying hoses.
  • Associated with the heating body is appropriate means for control and regulation of the fluid temperature, which means is adapted to automatically keep the desired fluid temperature by acting on the heating element power supply.
  • the fluid duct extends close to the heating elements as much as possible, in the form of a coil, a helix or a spiral, for example.
  • a typical heater of this kind has a substantially cylindrical heating body in which the heating elements in the form of electric resistors are longitudinally disposed, the fluid duct extending around said resistors in a helical configuration, whereas the electric connections and the control means are received in a head portion of the heating body.
  • Another known heater has, instead, a substantially parallelepiped shape, with the heating elements and the fluid duct disposed in a flattened parallelepiped body, at which the fluid inlet and outlet fittings terminate and on which the means for temperature control and regulation is fastened, said means being connected to a head portion housing the electric connections.
  • Heaters of the above type are particularly employed in spray painting and in this case a sufficiently strong structure is required because the fluid passing therethrough is submitted to high pressures.
  • the same heater which may be utilised with satisfactory results with a substance may be quite inappropriate for another substance, due to a very different coefficient of heat transmission.
  • the same heater used with fluids of high viscosity generates such a high flow resistance (pressure drop) that use of it becomes impossible. Therefore, in the above mentioned cases some results can only be achieved if several heaters, connected in series or in parallel to each other are available, which brings about higher costs.
  • the technical task underlying the present invention is to obviate the above drawbacks and limitations, by providing an electric heater for fluids, in particular paints, operation of which, in case of clogging caused by the fluid, can be easily restored without being obliged to throw the heater away.
  • a still further aim of the invention is to devise a heater of the concerned type, which is substantially more versatile as regards its possibilities of use, in particular a heater which can be used also with paints having greatly differentiated coefficients of heat transmission.
  • a further by no means last aim of the invention is to devise an electric heater to be also used in two-component systems, in which the advantage of restoring operation of the same in case of possible clogging of the fluid ducts is at all events maintained.
  • an electric heater for fluids, in particular paints, in accordance with the invention is generally identified by reference numeral 1. It comprises a heating body 2, internally provided with electric heating elements 3, such as electric resistors, only diagrammatically and partly shown, as their structure and arrangement are known.
  • the heating body 2 has a head portion 4, in which the electric connections are arranged in known manner.
  • the power cord 5 of heater 1 is connected with the head portion 4 as well as a cable 6 terminating at a thermostat 7 fastened to the heating body 2.
  • Thermostat 7, of known type embodies means 8 for temperature control and regulation, acting on the power supply of the heating elements 3 in known manner to automatically keep the fluid to be heated to the wished temperature.
  • the heating body 2 has a flattened substantially parallelepiped shape; obviously it could also have a different shape, a cylindrical or conical shape, for example. It is preferably made of a metal alloy casting having a high heat-transmission coefficient, into which the heating elements 3 with the respective power connections and connections to the control and regulation means 8 are inserted.
  • the heating body 2 can be associated in a removable manner with an interchangeable exchanger body 9, in which at least one circulation duct 10 for the fluid to be heated is provided.
  • the exchanger body 9 has a flattened substantially parallelepiped shape as well, the sizes of which make the two bodies 2 and 9 matchable by surface contact at one of their respective major faces.
  • the exchanger body 9 can be fastened to the heating body 2 by threaded means consisting of four threaded tie rods 11 for example, adapted to pass through the two bodies 2 and 9 at right angles to the major faces thereof, and of respective pairs of nuts and lock nuts 12 and 13, to be screwed down on the tie rods 11 from the outside, to lock the two bodies 2 and 9 against each other tightly and steadily so as to ensure an excellent contact for heat transmission.
  • threaded means consisting of four threaded tie rods 11 for example, adapted to pass through the two bodies 2 and 9 at right angles to the major faces thereof, and of respective pairs of nuts and lock nuts 12 and 13, to be screwed down on the tie rods 11 from the outside, to lock the two bodies 2 and 9 against each other tightly and steadily so as to ensure an excellent contact for heat transmission.
  • Duct 10 extends in the form of a coil for example, within the exchanger body 9, between a fluid inlet fitting 14 and a fluid outlet fitting 15, formed in body 9 and adapted for connection, in known manner, with fluid-conveying pipes, in particular flexible fluid-conveying hoses.
  • the exchanger body 9 is preferably made of a metal alloy casting, having a high coefficient of heat transmission, into which the circulation duct 10 is buried and from which fittings 14 and 15 emerge.
  • body 9 is made in the cheapest way, so that it can be replaced without involving high costs in case of anomalies such as clogging of duct 10.
  • a further advantageous feature of the heat exchanger 1 shown consists in arranging a second exchanger body 16, made in the same way as the exchanger body 9 for example, and susceptible of fastening to the heating body 2 on the opposite side relative to the exchanger body 9.
  • the second exchanger body 16 is shown in chain lines in Figs. 1 and 2.
  • the dual heat exchange surface enables the flow rate of the heated fluid to be doubled (the temperature being the same) or the fluid temperature to be doubled (the flow rate being the same), but also enables the same heater to be used for fluids having a very low heat-transmission coefficient, because the length of the heat-exchange path of travel is doubled.
  • the two exchangers 9 and 16 may be maintained hydraulically separated from each other and in this case the second exchanger 16 can be employed to simultaneously heat a second different fluid, for heating the atomisation air for example, in low- or medium-pressure air-mixed painting systems.
  • This hydraulically-separated arrangement of the two exchangers 9 and 16 can also be applied when two-component systems are for example concerned.
  • thermometer 17 for detecting temperature of the outcoming fluid is advantageously provided to be applied to the fluid outlet fitting 15. Reading of thermometer 17 can be used for adjustment of thermostat 7.
  • Heater 1 provided with one or two exchanger bodies, is then preferably enclosed in a protective casing consisting of two shell halves 18 removably coupled with each other in such a manner that only the connection fittings 14 and 15 and the regulation means for fluid temperature are allowed to emerge therefrom.
  • the heating body 2 and the exchanger body 9 may have a substantially cylindrical or conical shape, instead of having a parallelepiped shape, in this case being removably coupled with each other axially.
  • Bodies 2 and/or 9 and/or 16 can have a hollow cylindrical form and be removably fastened together, one at the inside of the other; for instance, the exchanger body 9 could be disposed internally of the heating body 2 or externally thereof. Where two exchanger bodies 9 and 16 are provided, they can be advantageously respectively arranged one at the inside and the other at the outside of the hollow cylindrical exchanger body 2.
  • bodies 2, 9 and possibly 16 may have a disc-shaped or substantially disc-shaped conformation and be coupled with each other at their flat faces, in particular they can be provided with a central disc-shaped heating body 2 and two side disc-shaped exchanger bodies 9 and 16, on the understanding that arrangement of the exchanger bodies is interchangeable.
  • the exchanger body or bodies 9 and/or 16 may internally house more than one fluid circulation duct 10, two ducts for example for two different fluids.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Paints Or Removers (AREA)
  • Pipe Accessories (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Lubricants (AREA)
EP99122745A 1998-11-27 1999-11-16 Elektrischer Flüssigkeitserhitzer, insbesondere für Farben Expired - Lifetime EP1004832B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1998MI000770U IT244403Y1 (it) 1998-11-27 1998-11-27 Riscaldatore elettrico per fluidi in particolare per vernici
ITMI980770U 1998-11-27

Publications (3)

Publication Number Publication Date
EP1004832A2 true EP1004832A2 (de) 2000-05-31
EP1004832A3 EP1004832A3 (de) 2002-07-17
EP1004832B1 EP1004832B1 (de) 2004-09-29

Family

ID=11379737

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99122745A Expired - Lifetime EP1004832B1 (de) 1998-11-27 1999-11-16 Elektrischer Flüssigkeitserhitzer, insbesondere für Farben

Country Status (4)

Country Link
EP (1) EP1004832B1 (de)
AT (1) ATE278162T1 (de)
DE (1) DE69920631D1 (de)
IT (1) IT244403Y1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2852674A1 (fr) * 2003-03-19 2004-09-24 Cie Mediterraneenne Des Cafes Dispositif de production d'eau chaude pour machines de fabrication de boissons chaudes
CN103411448A (zh) * 2013-08-26 2013-11-27 常熟市高压容器制造有限公司 一种管壳式换热器系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1375357A (en) * 1920-02-07 1921-04-19 Cyrus M Bosworth Electric water-heater
CH97583A (de) * 1921-07-02 1923-01-16 Huerlimann Jakob Apparat zum elektrischen Erhitzen durchfliessender Flüssigkeit.
US2247816A (en) * 1940-06-20 1941-07-01 Roy E Mcilrath Heating unit
DE853781C (de) * 1951-06-28 1952-10-27 Gerd Dr Med Oberhoffer Durchflusserhitzer mit kleiner Durchsatzgeschwindigkeit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1375357A (en) * 1920-02-07 1921-04-19 Cyrus M Bosworth Electric water-heater
CH97583A (de) * 1921-07-02 1923-01-16 Huerlimann Jakob Apparat zum elektrischen Erhitzen durchfliessender Flüssigkeit.
US2247816A (en) * 1940-06-20 1941-07-01 Roy E Mcilrath Heating unit
DE853781C (de) * 1951-06-28 1952-10-27 Gerd Dr Med Oberhoffer Durchflusserhitzer mit kleiner Durchsatzgeschwindigkeit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2852674A1 (fr) * 2003-03-19 2004-09-24 Cie Mediterraneenne Des Cafes Dispositif de production d'eau chaude pour machines de fabrication de boissons chaudes
CN103411448A (zh) * 2013-08-26 2013-11-27 常熟市高压容器制造有限公司 一种管壳式换热器系统

Also Published As

Publication number Publication date
IT244403Y1 (it) 2002-03-11
EP1004832B1 (de) 2004-09-29
ATE278162T1 (de) 2004-10-15
DE69920631D1 (de) 2004-11-04
ITMI980770U1 (it) 2000-05-27
EP1004832A3 (de) 2002-07-17

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