EP1296538A2 - Elektrische Heizung, insbesondere zur Innenraumbeheizung eines Instrumenten-Schutzschranks - Google Patents
Elektrische Heizung, insbesondere zur Innenraumbeheizung eines Instrumenten-Schutzschranks Download PDFInfo
- Publication number
- EP1296538A2 EP1296538A2 EP02017292A EP02017292A EP1296538A2 EP 1296538 A2 EP1296538 A2 EP 1296538A2 EP 02017292 A EP02017292 A EP 02017292A EP 02017292 A EP02017292 A EP 02017292A EP 1296538 A2 EP1296538 A2 EP 1296538A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- thermostat
- electric heater
- radiator
- cable
- heater according
- 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
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0202—Switches
- H05B1/0213—Switches using bimetallic elements
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/42—Heating elements having the shape of rods or tubes non-flexible
- H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material
- H05B3/50—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material heating conductor arranged in metal tubes, the radiating surface having heat-conducting fins
Definitions
- the invention relates to an electrical heater, in particular for interior heating an instrument protection cabinet, according to the preamble of the claim 1.
- a well-known, generic, electrical heater for heating the interior of an instrument protection cabinet consists of a radiator in the manner of a metallic Lamella blocks with a central receiving opening into which a heating element used and shed there.
- the heating element becomes electrical Energy supplied via electrical connection lines, at least of which one via a thermostat in the manner of a bi-metal button thermostat is led.
- the phase line wire is single-pole via the bi-metal button thermostat out and the zero wire is directly with the heating element connected. This requires a terminal box, from which each separate lines to the thermostat and to the heating element.
- the bi-metal button thermostat is arranged in an encapsulated housing, which is attached to a mounting bracket, which in turn Silicone spacer is connected to the radiator. With this arrangement the thermostat detects the ambient temperature and above the thermally conductive Mounting bracket also a defined proportion of the radiator surface temperature. This measure is a control engineering D component generated, which causes the switching hysteresis and thus an undesirable or inadmissible overshoot of the temperature control above the setpoint be reduced. The characteristic values of the thermostat are only for one Arrangement with thermal coupling to the radiator observed.
- the object of the invention is a generic electrical To create heating that works well and requires less installation is less expensive to manufacture with fewer components.
- the electrical connection lines are in a single Connection cable included.
- the thermostat is in this one connection cable as a bi-metal button thermostat, integrated and electrically connected.
- the Thermostat is at a certain cable length distance from the radiator integrated in the connection cable. This cable length gap is called thermal Measure the coupling distance so that the connection cables pass through Heat conduction a defined proportion of the radiator heat to the thermostat to be led.
- the thermostat thus records the ambient temperature and additionally the defined proportion of the radiator temperature as control technology D component.
- the measures according to the invention are advantageous for this effect much easier and cheaper than the corresponding measures from the state of the art.
- a terminal box and a mounting bracket, the associated terminals and connection means and the assembly effort required for this are eliminated. moreover the space requirement is reduced, the protection of the components against environmental influences and touch protection can be improved.
- the thermal coupling distance that is, the distance of the installation location of the thermostat from the radiator essentially depends on the type of components used, in particular their thermal conductivity and the installation and operating conditions, and can be determined for specific implementation simply by appropriate tests.
- a suitable cable length distance for the thermostat from the radiator of approx. 10 cm. It has been shown that this cable length spacing is not an exact critical variable and that the desired effect for reducing the switching hysteresis and for reducing overshoot around the setpoint value is achieved with good function with a relatively large tolerance range in the spacing.
- a Multi-core connection cable is used, its external insulation at the installation site the thermostat is removed. There is the live phase line wire severed and the thermostat connected in between. The others Cores as neutral conductors and protective conductors are not separated and close to Thermostat housing around this, preferably in a system connection. On the one hand, this makes space-saving integration of the thermostat achieved in the course of the connection cable and, on the other hand, a good target Heat transfer through heat conduction from the line wires to the thermostats causes.
- the electric heater according to the invention can be simplified in accordance with claim 6 Be carried out in an explosion-proof manner.
- a fuse as an excess temperature fuse used with the heating element in the receiving opening of the radiator and shed.
- the fuse is for intensive heat coupling directly in the heating element of the type a heating cartridge that can be inserted into the opening in the radiator integrated.
- the thermostat should be under / or in the fully installed state lie next to the radiator. Just as in the version according to the state the technology, it is not appropriate to place the thermostat over the radiator to arrange, since then the specified thermal coupling for the desired Purpose of reducing hysteresis from too strong, direct Heat transfer between the radiator and thermostat can be superimposed and the thermostat detects excessive ambient temperature values from the outset.
- Fig. 1 is an electrical heater 1 with a multi-core schematically Connection channel 2 shown.
- a heating element 4 In a receiving opening 3 of a radiator 17 are a heating element 4 and a fuse 5 with the associated Potted connection lines 6.
- the connecting cables 6 are guided outside the radiator 17 in a connecting cable 2.
- a bi-metal button thermostat 7 In a thickening of the connection cable 2 is a bi-metal button thermostat 7 integrated. With the dimension arrow, the cable length distance 8 is defined, which is dimensioned as a thermal coupling distance.
- FIG. 2 A longitudinal section through the connection cable 2 in the area of the bi-metal button thermostat 7 is shown in FIG. 2.
- the location of the thermostat is External insulation of the three-wire connection cable 2 removed and the live Phase wire 9 is cut. In between is the bi-metal button thermostat 7 connected.
- the zero wire 10 and the protective wire 11 are guided around the thermostat housing.
- a protective tube is located over the installation location of the bi-metal button thermostat 7 12 inserted and poured with a potting compound 13.
- strain reliefs 14 On both sides of the bi-metal button thermostat 7 are strain reliefs 14 for the subsequent ones Connection cable parts cast in. Additional protection is via bi-metal button thermostat 7 and the associated connection cable parts an outer Shrink tube 15 attached positively.
- FIG. 4 shows a longitudinal section to FIG. 2 rotated by 90 °.
- the view shows the routing of the zero line wire 10 and the protective line wire 11 around the bi-metal button thermostat 7 can be seen.
- the phase line core 9 two flat contacts 16 are formed, via which the switching process of the bi-metal button thermostat 7 to the phase line wire is transmitted.
- protective tube 12, casting compound 13, strain relief 14 and Shrink tube 15 also shown.
- FIG. 5 is a perspective view of the connecting cable 2 with the integrated bi-metal button thermostat 7 shown.
- the heating power of the electric heater 1 shown depends on the ambient temperature.
- the heating power is regulated that via the bi-metal button thermostat 7, which is integrated in the connection cable 2 is.
- the cable length spacing 8 i.e. the distance of the position of the bi-metal button thermostat 7 defined in the connecting cable 2 is the thermal coupling distance to see.
- the installation location of the bi-metal button thermostat 7 opposite the radiator 17 essentially depends on the type of components used, in particular of their thermal conductivity as well as the installation and operating conditions from. By simple experiments, the one for a concrete Execution corresponding cable length distance 8 can be determined.
Landscapes
- Control Of Resistance Heating (AREA)
Abstract
Description
- Fig. 1
- eine schematische Darstellung einer elektrischen Heizung mit einem Anschlusskabel,
- Fig. 2
- einen Längsschnitt durch das Anschlusskabel mit integriertem Thermostat,
- Fig. 3
- einen Schnitt A-A aus Fig. 2,
- Fig. 4
- einen Schnitt B-B aus Fig. 2,
- Fig. 5
- eine perspektivische Ansicht des Anschlusskabels mit integriertem Thermostat.
Claims (8)
- Elektrische Heizung, insbesondere zur Innenraumbeheizung eines Instrumenten-Schutzschranks,
mit einem Heizkörper (17) mit einer Aufnahmeöffnung (3),
mit einem Heizelement (4), das in die Aufnahmeöffnung (3) eingesetzt und dort vergossen ist,
mit elektrischen Anschlussleitungen (6), von denen wenigstens eine über einen Thermostaten als Bi-Metall-Knopfthermostat (7) geführt ist,
dadurch gekennzeichnet, dass die elektrischen Anschlussleitungen (6) in einem Anschlusskabel (2) enthalten sind,
dass der Bi-Metall-Knopfthermostat (7) im Anschlusskabel (2) integriert und dort elektrisch angeschlossen ist, und
dass der Thermostat in einem bestimmten Kabellängenabstand (8) vom Heizkörper entfernt im Anschlusskabel (2) integriert ist, wobei dieser Kabellängenabstand (8) als thermischer Koppelabstand so bemessen ist, dass über die Anschlussleitungen (6) durch Wärmeleitung ein definierter Anteil der Heizkörperwärme zum Thermostaten zurückgeführt wird, so dass der Thermostat die Umgebungstemperatur und den definiert zurückgeführten Anteil der Heizkörpertemperatur erfasst, wodurch die Schalthysterese und damit ein Überschwingen um den Sollwert reduzierbar sind. - Elektrische Heizung nach Anspruch 1, dadurch gekennzeichnet, dass ein mehradriges Anschlusskabel (2) verwendet ist, dessen Außenisolierung am Einbauort des Thermostaten entfernt ist,
dass dort die stromführende Phasen-Leitungsader (9) durchtrennt ist und dazwischen der Thermostat angeschlossen ist, und
dass die anderen Adern (10 und 11) nahe am Thermostatgehäuse um dieses herumgeführt sind. - Elektrische Heizung nach Anspruch 2, dadurch gekennzeichnet, dass über den Einbauort ein Schutzrohr (12) gesteckt ist, welches mit Vergussmasse (13) zu einem Vergusskörper ausgegossen ist, so dass der Thermostat mit seinen Anschlüssen im Schutzrohr (12) eingegossen und gehalten ist.
- Elektrische Heizung nach Anspruch 3, dadurch gekennzeichnet, dass zu beiden Seiten des Vergusskörpers Zugentlastungen (14) für die anschließenden Anschlusskabelteile mit eingegossen sind.
- Elektrische Heizung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der integrierte Thermostat und die Anschlusskabelteile von einem äußeren Schrumpfschlauch (15) umgeben sind.
- Elektrische Heizung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die elektrische Heizung (1) explosionsgeschützt ausgeführt ist und in der Aufnahmeöffnung (3) zusammen mit dem Heizelement (4) eine Schmelzsicherung (5) als Übertemperatursicherung eingesetzt und vergossen ist.
- Elektrische Heizung nach Anspruch 6, dadurch gekennzeichnet, dass die Schmelzsicherung (5) im Heizelement (4) integriert ist.
- Elektrische Heizung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass im fertig eingebauten Zustand der Thermostat unter oder neben dem Heizkörper (17) liegt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2001146239 DE10146239A1 (de) | 2001-09-20 | 2001-09-20 | Elektrische Heizung, insbesondere zur Innenraumbeheizung eines Instrumenten-Schutzschranks |
DE10146239 | 2001-09-20 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1296538A2 true EP1296538A2 (de) | 2003-03-26 |
EP1296538A3 EP1296538A3 (de) | 2006-11-02 |
EP1296538B1 EP1296538B1 (de) | 2012-12-26 |
Family
ID=7699591
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20020017292 Expired - Lifetime EP1296538B1 (de) | 2001-09-20 | 2002-08-01 | Elektrische Heizung, insbesondere zur Innenraumbeheizung eines Instrumenten-Schutzschranks |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1296538B1 (de) |
DE (1) | DE10146239A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2339261A3 (de) * | 2009-12-23 | 2014-08-27 | Gruppo Ragaini S.p.A. | Elektrischer Heizkörper mit Rohrwiderstand |
US20160370813A1 (en) * | 2015-06-19 | 2016-12-22 | Phillips & Temro Industries Inc. | Thermostat Assembly and Method of Manufacturing |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009020457B4 (de) | 2009-05-08 | 2011-05-19 | Martin Hess | Verfahren und Anordnung zur Regulierung der Temperatur in einem Innenraum eines Gehäuses, insbesondere einem Instrumentenschutzkasten, für elektrische Komponenten sowie Gehäuse |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3497677A (en) * | 1968-03-04 | 1970-02-24 | Elevator Equip | Electric heater unit for liquid reservoirs |
US4641121A (en) * | 1985-11-04 | 1987-02-03 | Texas Instruments Incorporated | Sealed electrical switch and mounting therefor |
DE3633682A1 (de) * | 1986-10-03 | 1988-04-14 | Hess Joachim | Heizblock zur beheizung von ventilbloecken und messgeraeten |
US5081339A (en) * | 1990-06-01 | 1992-01-14 | Sunbeam Corporation | Water bed heater |
DE29501186U1 (de) * | 1995-01-26 | 1996-05-30 | Paechter, Barbara, 70565 Stuttgart | Unterlage für Tiere |
DE19754158A1 (de) * | 1997-10-28 | 1999-05-12 | Marcel Hofsaes | Verfahren zum Isolieren eines elektrischen Bauteiles |
-
2001
- 2001-09-20 DE DE2001146239 patent/DE10146239A1/de not_active Ceased
-
2002
- 2002-08-01 EP EP20020017292 patent/EP1296538B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
None |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2339261A3 (de) * | 2009-12-23 | 2014-08-27 | Gruppo Ragaini S.p.A. | Elektrischer Heizkörper mit Rohrwiderstand |
US20160370813A1 (en) * | 2015-06-19 | 2016-12-22 | Phillips & Temro Industries Inc. | Thermostat Assembly and Method of Manufacturing |
Also Published As
Publication number | Publication date |
---|---|
EP1296538A3 (de) | 2006-11-02 |
DE10146239A1 (de) | 2003-04-24 |
EP1296538B1 (de) | 2012-12-26 |
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