EP2619785A1 - Electronic thermostat with safety activated by resistors - Google Patents
Electronic thermostat with safety activated by resistorsInfo
- Publication number
- EP2619785A1 EP2619785A1 EP11781850.0A EP11781850A EP2619785A1 EP 2619785 A1 EP2619785 A1 EP 2619785A1 EP 11781850 A EP11781850 A EP 11781850A EP 2619785 A1 EP2619785 A1 EP 2619785A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- resistors
- electronic board
- thermal protector
- bimetallic element
- previous
- 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
Links
- 230000028016 temperature homeostasis Effects 0.000 claims abstract description 5
- 230000001012 protector Effects 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000000523 sample Substances 0.000 claims description 8
- 238000003860 storage Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 230000003213 activating effect Effects 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 2
- 230000001960 triggered effect Effects 0.000 claims description 2
- 230000033228 biological regulation Effects 0.000 description 4
- 239000004020 conductor Substances 0.000 description 4
- 229910001374 Invar Inorganic materials 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H61/00—Electrothermal relays
- H01H61/02—Electrothermal relays wherein the thermally-sensitive member is heated indirectly, e.g. resistively, inductively
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/002—Thermally-actuated switches combined with protective means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/32—Thermally-sensitive members
- H01H37/34—Means for transmitting heat thereto, e.g. capsule remote from contact member
Definitions
- the object of the present invention is a safety temperature control device (herein referred to as thermal protector) for heating appliances, in particular for electrically powered storage water heaters.
- thermal protector a safety temperature control device for heating appliances, in particular for electrically powered storage water heaters.
- thermo-regulators temperature adjustment devices
- the thermal protection function has the purpose of preventing the temperature of the controlled heating appliance from exceeding hazardous limits when the thermo-regulation function of the same temperature is faulty.
- Patent application AN2010A000131 filed by the applicant of the current patent, describes a thermostat characterised, among the other things, by the presence of an electronic board having the function of regulation and located in the same box seating the electromechanical actuators of the safety function.
- thermostat electromechanical thermo-regulating and thermal protecting thermostat made according to the technology shown in figure 1.
- FIG 1 shows an exploded view of a device (hereinafter generically referred to as "thermostat"), the containment box 2 whereof comprises a base 2.1 and a cover 2.2.
- Reference numeral 3' indicates a thermo-sensitive element extending outside base 2.1 inwards of the environment to be controlled, in particular the storage tank of the water heater.
- said thermo-sensitive element 3' substantially consists of a heat-expansible and good heat conductor tube, generally made of brass, wherein a rod 5 with a low heat expansion is coaxially arranged, usually made of INVAR.
- a rod 5 with a low heat expansion is coaxially arranged, usually made of INVAR.
- the heat expansible tube 3' is subject to an elongation that also pulls the INVAR rod 5, constrained thereto at the outermost end.
- a stem 5 which in turn acts on a monostable elastic sheet micro-switch 7, said INVAR rod carries out the thermo-regulating role of mechanical actuator on the contacts inside the thermostat, interrupting/restoring the supply to the electrical resistors.
- the thermal protection function is ensured by an actuator consisting of a bistable bimetallic element 4 (commonly called "clickson"), arranged within the thermostat box 2 in a tray 2.4 made in base 2.1 in a position that is sufficiently close to tube 3' so that its temperature is strongly influenced by the same.
- an actuator consisting of a bistable bimetallic element 4 (commonly called "clickson"), arranged within the thermostat box 2 in a tray 2.4 made in base 2.1 in a position that is sufficiently close to tube 3' so that its temperature is strongly influenced by the same.
- the above heat expansible tube 3' passively acts as heat conductor as regards the thermal protection function but is also part of an actual actuator (consisting in the combination "heat expansible tube/low heat expansion rod").
- Said clickson 4 as said, consists of a bistable bimetallic disc, capable of suddenly reversing the concavity of its camber when a predetermined critical temperature is reached, causing the opening of special contacts 2.5 through the aid of a cursor 5.2, thus causing the cut off of the power to the electrical resistors.
- the above described thermostat of fig. 1 carries out its tasks well; in particular, the opening mechanism of contacts 2.5, by the effect of clickson 4, is simple and reliable.
- said thermal protector as a whole exhibits some well-known limitations, due to both the quite rough tolerance at which the bistable clickson may be calibrated, and to the quite inaccurate relation that exists between the excess temperature of the top of the water heater that the thermal protection function must prevent, and the temperature sensed by clickson 4.
- tray 2.4 wherein clickson 4 is seated is intentionally located substantially in contact with the flange of the water heater whereon the thermostat is mounted so that the same clickson 4 is also influenced by the flange temperature.
- the temperature reached by clickson 4 is a function of the flange temperature and of the water temperature along the entire heat expansible tube 3' and not only of the temperature of the high zone of the water heater that has to be monitored.
- thermo-regulator the maximum temperature of the water heater to values quite lower than those actually prohibited by the regulations. This may imply limitations to the thermal energy that may be stored.
- thermal protecting thermostats mentioned so far is that, due to the thermal inertia of the masses that must be crossed, there is an unavoidable delay of a few seconds between the time of reaching the abnormal temperature and that when such temperature has effects on the same thermal protector.
- thermostats mentioned so far are specific for a water storage heater and not usable for other heating appliances.
- the main object of the present invention is to obviate such drawbacks by providing a thermal protector that still comprises a bistable bimetallic element but the operation whereof is substantially influenced only by the temperature existing in the zone to be monitored.
- a second object of the present invention is to provide a thermal protector wherein the fact that the calibration temperature of said bistable bimetallic element may only be obtained roughly is unimportant.
- a third object of the present invention is to provide a thermal protector wherein the position of said bistable bimetallic element is not forced to such positions as to make it receive heat from the water heater through the flange or other heat transmitting means from the zone to be monitored.
- a further object of the present invention is to provide a thermal protector with reduced reaction times upon reaching abnormal temperatures compared to the prior art.
- a further object of the present invention is to provide a single and compact thermostat suitable for acting as thermo-regulator and thermal protector capable of achieving one or more of said objects.
- a further object of the present invention is to provide a thermo-protector or thermal regulator and thermo-protector thermostat usable in a position not in close proximity with the tank of a water heater.
- a further object of the present invention is to provide a thermo-protector or thermal regulator and thermo-protector thermostat that is interchangeable, as regards dimensions and electrical connections, with thermostats according to the prior art.
- a further object of the present invention is to provide a thermo-protector or thermal regulator and thermo-protector thermostat usable in other heating appliances differing from a water storage heater.
- FIG. 2 shows a perspective view of the thermostat according to the invention
- figure 3 shows an exploded substantially side view of the thermostat of the invention
- figure 4 shows an exploded substantially bottom view of the thermostat of the invention.
- reference numeral 1 globally indicates the thermostat comprising, as in the prior art, a containment box 2 that is provided with a base 2.1 and a cover 2.2.
- a probe holder element 3 extends from said base 2.1 of said box 2, suitable for supporting one or more electronic sensors (not shown in the figure), such as NTC or PTC or thermocouple thermistors, or still other per se known types, suitable for transmitting electrical signals correlated to the temperature sensed to the electronic processing means, optionally also through the methods and the means already described in patent application AN2010A000131.
- electronic sensors such as NTC or PTC or thermocouple thermistors, or still other per se known types, suitable for transmitting electrical signals correlated to the temperature sensed to the electronic processing means, optionally also through the methods and the means already described in patent application AN2010A000131.
- said probe holder element 3 may consist of a traditional tubular element or, as shown in the annexed figures, a flat bar.
- any element intended for performing only the support role for one or more electronic sensors is suitable, since there is no need for it to also act as essential element for the thermal protection function: in fact, in the present invention, such safety function is fully performed by other means and therefore it is not required for said probe holder element 3 to be an actuator as in the case of the combination "heat expansible tube/low heat expansion rod", nor a heat conductor.
- an electronic board 8 comprising a microprocessor (see figs.
- said electronic board 8 with the relevant microprocessor are normally intended for managing the thermo-regulation function, giving input for opening/closing the electrical contacts of the circuit powering the connecting fastons 2.6 of the resistors, according to the temperature values sensed by the electronic sensors located on the probe holder element 3.
- the thermal protection function is managed by said electronic means, which also give input for acting on the bistable bimetallic element 4 (clickson) which in turn, in a known manner, opens the contacts of the safety circuit and disables the power to the electrical resistors through kinematic return means.
- Figs. 3 and 4 show details of the means and methods for carrying out the thermal protection function ensured by thermostat 1.
- the electronic board 8 seats at least one resistor 6: it should be noted that hereinafter, the term “resistor” refers with no distinction to a resistor or a thermal resistor, preferably of the PTC type, or in any case to any resistive electrical component subject to heating when crossed by electrical current. In the version shown in the annexed figures, while a single resistor 6 is sufficient for the purpose, the presence of a pair of resistors 6.1 and 6.2 is usefully provided, so that the second one performs the designated task in case of failure of the first one.
- said one or more resistors 6 do not receive electrical power from the electronic board 8.
- the microprocessor enables the electrical power to one or more of said resistors 6 by the electronic board 8.
- Said at least one resistor 6 is located in the proximity of clickson 4, in such position (preferably at the bottom) as to be able to heat said clickson 4 up to make it trip.
- said clickson 4 substantially works in the same manner already seen for the thermostat of the prior art of fig. 1, in short opening the electrical contacts 2.5 for powering fastons 2.6 of the electrical resistors.
- clickson 4 is provided with a stem 7 which, upon the inversion of the camber, pulls an anchor 7.2 associated thereto; the latter in turn opens the sheets constituting the electrical contacts 2.5.
- each resistor 6 must deliver is sufficiently low as not to damage the electronic board 8.
- a single resistor or thermistor 6 is already sufficient for tripping clickson 4, whereas the presence of additional resistors only serves for ensuring the operation also in the case of failure of the first resistor: in fact, it is possible to provide for a version wherein a special electronic circuit associated to board 8 is capable of detecting the proper operation or the possible failure of the first resistor 6.1, in this second case disabling the power thereof and activating the second resistor 6.2 or the further resistors.
- resistors 6 are PTC as they have the known capability of auto-adjusting the maximum temperature they can reach.
- Said one or more resistors 6 are usually activated by the microprocessor through a low voltage circuit; as an alternative it is also possible for them to be directly powered by the mains high voltage, through one or more piloting TRIACs.
- the safety bimetallic and bistable element represented by clickson 4 is subject to the influence of one or more resistors 6 powered by the electronic board 8; thus, unlike the prior art, such clickson is not activated by the probe holder element 3 anymore, neither in the version thereof represented by the "heat expansible tube/low heat expansion rod" or in that of simple heat conductor.
- such configuration of the probe holder element 3 is absolutely unnecessary as it only has to perform the task of supporting the electronic sensors and make the signal recorded thereby reach the underlying electronic board 8, also with the methods and the means already described in patent application AN2010A000131.
- thermostat 1 The advantages in terms of accuracy of the operation of thermostat 1 are clear, thanks to the sensitivity ensured by electronic signals processed by special electronic circuits.
- the thermal protector is triggered subsequent to signals received from electronic sensors that may be arranged in the most appropriate point.
- the position of clickson 4 is not influenced by the need of receiving, more or less directly, heat from the zone the temperature whereof has to be monitored.
- Fig. 4 highlights a possible further feature of the thermostat described above, consisting in the fact that pins 2.7 (suitable for mechanically constraining base 2.1 of box 2 to the underlying electronic board 8), or at least one of them, also perform the role of electrical connectors of the same board 8 to the electrical resistors and to the network.
- the same pins 2.7 also have the role of spacers for the electronic board 8 from base 2.1 of the containment box 2, so as to prevent undesired overheating of the board and create an adequate space for the components thereof, such as said one or more resistors 6, the regulation relay 8.1 and any fuses that protect the contacts of the various relays from overcurrents that would cause the gluing of the same.
- thermostat 1 can allow the manual reset of clickson 4, once the regular operating conditions of the water heater have been restored: through a special hole 7.1 made on cover 2.2 it is possible to act on the end of stem 7 associated to the clickson, pressing it and thus restoring the initial concavity of the camber of said clickson 4.
Landscapes
- Thermally Actuated Switches (AREA)
- Control Of Resistance Heating (AREA)
- Control Of Temperature (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITAN2010A000153A IT1401780B1 (en) | 2010-09-22 | 2010-09-22 | ELECTRONIC THERMOSTAT WITH SAFETY ACTIVATED BY RESISTORS. |
PCT/IB2011/002155 WO2012038795A1 (en) | 2010-09-22 | 2011-09-16 | Electronic thermostat with safety activated by resistors |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2619785A1 true EP2619785A1 (en) | 2013-07-31 |
EP2619785B1 EP2619785B1 (en) | 2014-10-22 |
Family
ID=43738697
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11781850.0A Active EP2619785B1 (en) | 2010-09-22 | 2011-09-16 | Electronic thermostat with safety activated by resistors |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2619785B1 (en) |
CN (1) | CN103119681B (en) |
IT (1) | IT1401780B1 (en) |
RU (1) | RU2545515C2 (en) |
WO (1) | WO2012038795A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011103331B3 (en) | 2011-05-27 | 2012-11-29 | Inor Process Ab | Temperature sensor for a contact thermometer |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU1403142A1 (en) * | 1986-12-15 | 1988-06-15 | Научно-исследовательский и экспериментальный институт автомобильного электрооборудования и автоприборов | Thermal relay |
DE3827254A1 (en) * | 1988-08-11 | 1990-02-15 | Vdo Schindling | Temperature switch |
RU2016535C1 (en) * | 1991-06-28 | 1994-07-30 | Государственное научно-производственное предприятие "Импульс" | Switch-disconnector for water electric heater |
EP0724767A1 (en) * | 1993-10-21 | 1996-08-07 | Otter Controls Limited | Improvements relating to electrical heating elements and controls therefor |
IT1262416B (en) * | 1993-10-29 | 1996-06-19 | Merloni Termosanitari Spa | IMPROVED SAFETY SYSTEM, IN PARTICULAR FOR THERMOSTAT WITH IMMERSION SENSOR. |
US6246831B1 (en) * | 1999-06-16 | 2001-06-12 | David Seitz | Fluid heating control system |
ES2291291T3 (en) * | 2001-01-10 | 2008-03-01 | Electrovac Ag | TEMPERATURE LIMITER. |
ITAN20030039A1 (en) | 2003-08-04 | 2005-02-05 | Merloni Termosanitari Spa | ELECTRONIC THERMOPROTECTOR FOR ELECTRIC WATER HEATERS. |
CN2742555Y (en) * | 2004-09-30 | 2005-11-23 | 宁波金海电子有限公司 | Heat sequencer |
CN101685722B (en) * | 2008-09-26 | 2011-12-07 | 游聪谋 | Double temperature-sensing power-off circuit protection structure |
-
2010
- 2010-09-22 IT ITAN2010A000153A patent/IT1401780B1/en active
-
2011
- 2011-09-16 RU RU2013115625/07A patent/RU2545515C2/en active
- 2011-09-16 EP EP11781850.0A patent/EP2619785B1/en active Active
- 2011-09-16 CN CN201180045454.5A patent/CN103119681B/en not_active Expired - Fee Related
- 2011-09-16 WO PCT/IB2011/002155 patent/WO2012038795A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2012038795A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2012038795A1 (en) | 2012-03-29 |
CN103119681B (en) | 2015-08-12 |
RU2013115625A (en) | 2014-10-27 |
CN103119681A (en) | 2013-05-22 |
RU2545515C2 (en) | 2015-04-10 |
ITAN20100153A1 (en) | 2012-03-23 |
EP2619785B1 (en) | 2014-10-22 |
IT1401780B1 (en) | 2013-08-28 |
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