EP1004832B1 - Réchauffeur de fluides, en particulier pour peintures - Google Patents

Réchauffeur de fluides, en particulier pour peintures Download PDF

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Publication number
EP1004832B1
EP1004832B1 EP99122745A EP99122745A EP1004832B1 EP 1004832 B1 EP1004832 B1 EP 1004832B1 EP 99122745 A EP99122745 A EP 99122745A EP 99122745 A EP99122745 A EP 99122745A EP 1004832 B1 EP1004832 B1 EP 1004832B1
Authority
EP
European Patent Office
Prior art keywords
heater
heating body
heating
heat exchanger
duct
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.)
Expired - Lifetime
Application number
EP99122745A
Other languages
German (de)
English (en)
Other versions
EP1004832A2 (fr
EP1004832A3 (fr
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/fr
Publication of EP1004832A3 publication Critical patent/EP1004832A3/fr
Application granted granted Critical
Publication of EP1004832B1 publication Critical patent/EP1004832B1/fr
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 paints, of the type defined in the preamble of Claim 1. Heating of the paint takes place while the paint is running through the circulation duct between a duct inlet and a duct 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 paint temperature, which means is adapted to automatically keep the desired paint temperature by acting on the heating member power supply.
  • the circulation duct extends close to the heating member 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 members in the form of electric resistors are longitudinally disposed, the circulation 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 member and the circulation duct disposed in a flattened parallelepiped body, at which the duct 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 paint 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 paints 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 inlet connection houses means for controlling the power supply of the heating member.
  • the heating body has a hollow cylindrical shape in the interior of which there is arranged a heat exchanger body in the form of a tube of small diameter that can be extracted for disinfecting operations.
  • the technical task underlying the present invention is to obviate the above drawbacks and limitations, by providing an electric heater for paints, operation of which, in case of clogging caused by the paint, 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 for paints 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 circulation ducts is at all events maintained.
  • an electric heater for paints in accordance with the invention, is generally identified by reference numeral 1. It comprises a heating body 2, internally housing an electric heating member 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 supply cord 5 of heater 1 is connected with the head portion 4 as well as a cable 6 terminating at a thermostat 7 externally supported by the heating body 2.
  • Thermostat 7, of known type embodies means 8 for temperature control and regulation, acting on the powersuppty of the heating member 3 in known manner for automatically controlling operation of the heating member to keep the paint to be heated to the wished temperature.
  • the heating body 2 has a flattened substantially parallelepiped shape. It is preferably made of a metal alloy casting having a high heat-transmission coefficient, into which the heating member 3 with the respective power connections and connections to the control and regulation means 8 is inserted.
  • the heating body 2 externally supports in a removable manner two interchangeable heat exchanger bodies 9 and 16, in which at least one circulation duct 10 for the paint to be heated is provided.
  • Each exchanger body 9, 16 has a flattened substantially parallelepiped shape as well, the sizes of which make the two bodies 9 and 16 matchable by surface contact at one of their respective major faces with opposite faces of the heating body 2 to cause the heat exchanger bodies 9 and 16 to receive heat from the heating body 2.
  • the exchanger bodies 9 and 16 can be removably and interchangeably fastened to the heating body 2 by threaded means consisting of four threaded tie rods 11 for example, adapted to pass through the bodies 2 and 9, 16 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 bodies 2 and 9, 16 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 bodies 2 and 9, 16 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 bodies 2 and 9, 16 against each other tightly and steadily so as to ensure an excellent contact for heat transmission.
  • duct 10 As shown for heat exchanger body 9, duct 10, only diagrammatically and partly shown, extends in the form of a coil for example, within the exchanger body, between a paint inlet fitting 14 and a paint outlet fitting 15, formed in body 9 and adapted for connection, in known manner, with paint-conveying pipes, in particular flexible paint-conveying hoses.
  • the exchanger bodies 9, 16 are 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.
  • each heat exchanger body 9, 16 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.
  • each exchanger body can be removed and replaced by another one which is identical with or equivalent to the former, so as to restore operation of the heater.
  • a further advantageous feature of the heater 1 shown consists in that versatility of heater 1 is greatly increased.
  • arrangement of a second exchanger body 16 enables the exchange surface to be doubled, by completely utilising the thermal potential of the heating body 2.
  • the two exchanger bodies 9 and 16 can be connected with each other in series or in parallel as regards the respective paint-circulation ducts 10.
  • the dual heat exchange surface enables the flow rate of the heated paint to be doubled (the temperature being the same) or the paint temperature to be doubled (the flow rate being the same), but also enables the same heater to be used for paints having a very low heat-transmission coefficient, because the length of the heat-exchange path of travel is doubled.
  • the two heat exchanger bodies 9 and 16 may be maintained hydraulically separated from each other and in this case the second exchanger body 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 exchanger bodies 9 and 16 can also be applied when two-component systems are for example concerned.
  • thermometer 17 for detecting temperature of the outcoming paint is advantageously provided to be applied to the outlet fitting 15. Reading of thermometer 17 can be used for adjustment of thermostat 7.
  • Heater 1 provided with two heat 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.
  • Bodies 2, 9 and 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 heat exchanger bodies 9 and 16, on the understanding that arrangement of the exchanger bodies is interchangeable.
  • the exchanger bodies 9 and 16 may internally house more than one circulation duct 10, two ducts for example for two different paints.

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)
  • Lubricants (AREA)
  • Pipe Accessories (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Claims (3)

  1. Un réchauffeur électrique pour peintures, comprenant un corps chauffant (2) logeant à son intérieur un élément chauffant électrique (3), des dispositifs de commande (7, 8) intervenant sur une alimentation de courant dudit élément chauffant (3) pour commander le fonctionnement dudit élément chauffant (3) et un corps échangeur de chaleur (9) équipé d'un conduit de circulation (10) et prédisposé pour recevoir la chaleur dudit corps chauffant (2) caractérisé par le fait que cesdits dispositifs de commande (7, 8) sont supportés à l'extérieur par ledit corps chauffant (2) et par le fait que ledit corps chauffant (2) supporte extérieurement deux corps échangeurs de chaleur (9, 16) construits comme des unités jetables fixées de manière amovible et interchangeable audit corps chauffant (2) sur ses faces externes opposées.
  2. Un réchauffeur conformément à la revendication 1, caractérisé par le fait que lesdits corps échangeurs de chaleur (9, 16) ont des conduits de circulation (10) hydrauliquement séparés l'un de l'autre.
  3. Un réchauffeur conformément aux revendications 1 ou 2, caractérisé par le fait que lesdits corps échangeurs de chaleur (9, 16) sont réalisés en une coulée d'alliage métallique dans laquelle au moins un conduit de circulation (10) est inséré.
EP99122745A 1998-11-27 1999-11-16 Réchauffeur de fluides, en particulier pour peintures Expired - Lifetime EP1004832B1 (fr)

Applications Claiming Priority (2)

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

Publications (3)

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

Family

ID=11379737

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99122745A Expired - Lifetime EP1004832B1 (fr) 1998-11-27 1999-11-16 Réchauffeur de fluides, en particulier pour peintures

Country Status (4)

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

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2852674B1 (fr) * 2003-03-19 2008-09-05 Dispositif de production d'eau chaude pour machines de fabrication de boissons chaudes
CN103411448B (zh) * 2013-08-26 2015-05-13 常熟市高压容器制造有限公司 一种管壳式换热器系统

Family Cites Families (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

Also Published As

Publication number Publication date
ITMI980770U1 (it) 2000-05-27
IT244403Y1 (it) 2002-03-11
EP1004832A2 (fr) 2000-05-31
DE69920631D1 (de) 2004-11-04
ATE278162T1 (de) 2004-10-15
EP1004832A3 (fr) 2002-07-17

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