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EP0743666B1 - Thermostat de régulation comportant dans la sonde un dispositif de sécurité - Google Patents

Thermostat de régulation comportant dans la sonde un dispositif de sécurité Download PDF

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Publication number
EP0743666B1
EP0743666B1 EP96420174A EP96420174A EP0743666B1 EP 0743666 B1 EP0743666 B1 EP 0743666B1 EP 96420174 A EP96420174 A EP 96420174A EP 96420174 A EP96420174 A EP 96420174A EP 0743666 B1 EP0743666 B1 EP 0743666B1
Authority
EP
European Patent Office
Prior art keywords
probe
thermostat
slide
tube
spring
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
EP96420174A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0743666A1 (fr
Inventor
Jean Serigny
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.)
Cotherm SA
Original Assignee
Cotherm SA
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 Cotherm SA filed Critical Cotherm SA
Publication of EP0743666A1 publication Critical patent/EP0743666A1/fr
Application granted granted Critical
Publication of EP0743666B1 publication Critical patent/EP0743666B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01H37/46—Thermally-sensitive members actuated due to expansion or contraction of a solid
    • H01H37/48—Thermally-sensitive members actuated due to expansion or contraction of a solid with extensible rigid rods or tubes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H61/00—Electrothermal relays
    • H01H61/01—Details
    • H01H61/0107—Details making use of shape memory materials
    • H01H2061/0115—Shape memory alloy [SMA] actuator formed by coil spring
    • 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
    • H01H37/323—Thermally-sensitive members making use of shape memory materials

Definitions

  • the present invention relates to a probe thermostat intended for example regulating the temperature of the water inside an electric water heater.
  • Thermostats are thermo-sensitive action control devices cyclic intended to maintain the temperature between two values particular under normal operating conditions and in which user adjustment may be provided.
  • Probe thermostats are electro-mechanical regulation systems temperature comprising on the one hand a strong metal tube coefficient of expansion (copper, brass) inside which is placed a metal rod with a low coefficient of expansion (invar) and other share an electrical contact controlling the current to be sent to the heating resistance and activated by differential expansion of the two metals constituting the probe.
  • Known probe thermostats for electric water heaters operating under pressure generally include a safety device to cut off the power supply for heating of the enclosure in which the probe is placed in the event of elevation untimely temperature inside this enclosure.
  • thermostats of this kind which are described for example in Patent 2,579,013 belonging to the Applicant and which more particularly include a blistering washer which deforms under the action of a determined temperature in order to actuate a slide whose movement causes the heating circuit of the the enclosure in which the thermostat probe is placed.
  • This kind of thermostat transmits the heat of the water contained in the enclosure by conduction to the metal base of the latter's body where the blistering washer is housed.
  • the latter must be planned to deform when the temperature, at the end of the probe, inside a water heater, reaches a critical threshold in order to cut the circuits electric.
  • a washer To obtain perfect functioning, a washer must be provided blistering which deforms at a temperature much lower than that of critical threshold due to the distance between the probe tip and the base of the thermostat fixed against the enclosure.
  • the improvements which are the subject of the present invention aim to allow the realization of a safety device acting at the end of the probe, therefore at the heart of the system to be regulated.
  • the thermostat according to the present invention comprises nearby from the free end of the probe and between the tube and the rod a safety device consisting of a spring made of memory alloy shaped which acts by means of a spacer on a slide whose displacement causes the opening of the electric breakers during an untimely rise in temperature inside the enclosure in which said probe is immersed.
  • Fig. 1 is an exploded perspective view illustrating the device security according to the present invention.
  • Fig. 2 is a section showing a probe thermostat provided with the safety device in operating position.
  • Fig. 3 is a section similar to that of FIG. 2, but illustrating electrical breakers open due to expansion of the device safety during an untimely increase in temperature.
  • a probe thermostat 1 comprising a base 2 made of plastic and which carries on the one hand the mechanism for controlling the supply circuit of a heating system and on the other hand a metal probe 3.
  • the probe 3 comprises a tube 3 a with a high coefficient of expansion which is subject to a metal bowl 3 b comprising two diametrically opposite tabs 3 c and 3 d which are housed respectively in slots 2 a and 2 b formed in the base 2 .
  • the leg 3 c has a vertical extension 3 e , the base of which is adjacent to two wings 3 f and 3 g oriented in the same direction as the extension 3 e .
  • the wings 3 f and 3 g are flattened inside the slot 2 a so as to axially retain the bowl 3 b relative to the base 2.
  • the lug 3 d comprises two parallel pins 3 h and 3 i separated by a central groove 3 i to allow the folding of said lugs inside the slot 2 b to constitute the second fixing of the bowl 3 b relative to at base 2.
  • a metal rod 4 with a low coefficient of expansion one end of which is crimped to the tube 3 a , while the other end cooperates with an adjustment member 5.
  • the extension 3 e of the tab 3 c protrudes above the base 2 to serve as a hinge at one of the ends of an insulating amplifier lever 6 has an electrical contact 6 which is actuated by the rod 4 during temperature variations prevailing inside the enclosure in which the probe 3 is placed.
  • the latter comprises at its free end and between the tube 3 and the rod 4 has a safety device 7.
  • the device consists of a spring 7 is made of a shape memory alloy which is traversed by the rod 4.
  • the spring 7 a comes to bear on a washer 7 b itself crossed by the rod 4 and which is arranged near the crimping of the tube 3 a with the rod 4. It can be provided as a variant that the spring 7 has come to bear directly against the conical part 3 k of the tube 3 a without this intervening in the proper functioning of the safety device 7.
  • a cylindrical spacer 7 c is introduced into the remaining part of the probe 3 between the tube 3 a and the metal rod 4.
  • the spacer 7 c is of a length slightly greater than that of the tube 3 a to come out into the space delimited by the bowl 3 b .
  • the spacer 7 c bears against the spring 7 a and remains free in its vertical movements inside the probe 3.
  • a slide 8 made of insulating material such as plastic, crossed by the rod 4 and which can move back and forth vertically inside a suitable opening 2 c formed in the base 2.
  • the slide 8 has a central part 8 a which is extended by two wings 8 b , 8 c diametrically opposite and integral each with a stop 8 d , 8 e extending vertically and parallel to the movement axis of the slide 8.
  • One of the wings and more particularly that referenced 8 c comprises near the stop 8 e a reset finger 8 f which is directed towards the outside of the housing 9 shown in phantom (fig. 2 and 3).
  • each safety switch 10 and 11 is mounted on the phases of supply of electric current to the resistance of a water heater or the like, not shown.
  • the ends of the elastic blades 10 a and 11 a carry a movable contact 10 b and 11 b suitable for cooperating with a fixed contact 10 c and 11 c secured to the connection terminals 12, only one of which is shown in FIG. 2 and 3.
  • thermostat 1 results from the foregoing explanations, It is understood that the contact 6 is controlled by the amplifier lever 6 a as a function of the relative expansion of the tube 3 a relative to the rod 4. The adjustment of the thermostat 1 is carried out by button 5.
  • the reset finger 8 f can be omitted to avoid using thermostats having undergone an untimely rise in temperature.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Thermally Actuated Switches (AREA)
  • Control Of Temperature (AREA)
EP96420174A 1995-05-19 1996-05-14 Thermostat de régulation comportant dans la sonde un dispositif de sécurité Expired - Lifetime EP0743666B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9506267 1995-05-19
FR9506267A FR2734400B1 (fr) 1995-05-19 1995-05-19 Thermostat de regulation comportant dans la sonde un dispositif de securite

Publications (2)

Publication Number Publication Date
EP0743666A1 EP0743666A1 (fr) 1996-11-20
EP0743666B1 true EP0743666B1 (fr) 1999-01-27

Family

ID=9479396

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96420174A Expired - Lifetime EP0743666B1 (fr) 1995-05-19 1996-05-14 Thermostat de régulation comportant dans la sonde un dispositif de sécurité

Country Status (5)

Country Link
EP (1) EP0743666B1 (he)
DE (1) DE69601442T2 (he)
ES (1) ES2129256T3 (he)
FR (1) FR2734400B1 (he)
IL (1) IL114563A (he)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107024945A (zh) * 2017-06-01 2017-08-08 中山市勤峰电器有限公司秋浦分公司 一种电子式调温棒

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2747459B1 (fr) * 1996-04-11 1998-06-19 Cotherm Sa Dispositif de chauffage et de regulation pourvu d'un systeme de securite a memoire de forme
ITAN20010046A1 (it) * 2001-10-29 2003-04-29 Thermowatt Spa Termoprotettore di sicurezza, in particolare per scalda acqua ad accumulo ad alimentazione elettrica
FR2870985B1 (fr) * 2004-05-26 2007-05-18 Cotherm Sa Thermostat de regulation a dispositif de retenue

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3507037A (en) * 1968-04-16 1970-04-21 Robertshaw Controls Co Method of making a thermostat tube assembly
FR2579013B1 (fr) * 1985-03-18 1987-04-10 Cotherm Sa Perfectionnements aux thermostats a tube plongeur
IT233654Y1 (it) * 1993-04-28 2000-02-01 Lorenzi Vascao S P A Termostato a gambo per scaldabagni a duplice azione di sicurezza e a bassa inerzia termica d'intervento
IT1262416B (it) * 1993-10-29 1996-06-19 Merloni Termosanitari Spa Sistema di sicurezza perfezionato, in particolare per termostato con sensore ad asta ad immersione.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107024945A (zh) * 2017-06-01 2017-08-08 中山市勤峰电器有限公司秋浦分公司 一种电子式调温棒

Also Published As

Publication number Publication date
DE69601442D1 (de) 1999-03-11
EP0743666A1 (fr) 1996-11-20
IL114563A0 (en) 1995-11-27
IL114563A (he) 1998-10-30
ES2129256T3 (es) 1999-06-01
FR2734400B1 (fr) 1997-07-25
DE69601442T2 (de) 1999-09-23
FR2734400A1 (fr) 1996-11-22

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