EP0559517B1 - Thermostat mit automatischer Rückstellung - Google Patents

Thermostat mit automatischer Rückstellung Download PDF

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Publication number
EP0559517B1
EP0559517B1 EP19930400439 EP93400439A EP0559517B1 EP 0559517 B1 EP0559517 B1 EP 0559517B1 EP 19930400439 EP19930400439 EP 19930400439 EP 93400439 A EP93400439 A EP 93400439A EP 0559517 B1 EP0559517 B1 EP 0559517B1
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EP
European Patent Office
Prior art keywords
casing
thermostat
cover
skirt
bimetallic element
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
EP19930400439
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English (en)
French (fr)
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EP0559517A1 (de
Inventor
Maurice Frisquet
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.)
FRISQUET SA
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FRISQUET SA
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Publication date
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Classifications

    • 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
    • H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
    • H01H37/54—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting
    • H01H37/5427—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting encapsulated in sealed miniaturised housing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/12—Means for adjustment of "on" or "off" operating temperature
    • H01H37/16—Means for adjustment of "on" or "off" operating temperature by varying the proportion of input heat received by the thermal element, e.g. by displacement of a shield
    • 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
    • H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
    • H01H37/54—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting

Definitions

  • the present invention relates to an automatic reset thermostat, of the type comprising a housing, at least one fixed contact and one movable contact mounted in the housing to establish or break an electrical circuit according to the position of the movable contact, at least two connected connection conductors respectively to the fixed and movable contacts for electrically connecting them to an external circuit, a bimetallic element deformable by heat, which is mounted on an end face of the housing and which suddenly changes from a rest position to a deformed position when its temperature reaches a first predetermined value and returns to its rest position when its temperature drops to a second predetermined value lower than the first value, and a transmission element interposed between the bimetallic element and the movable contact for actuating the latter when the bimetallic element moves from its rest position to its posi distorted tion and vice versa.
  • Thermostats of this type are well known and are used in particular as temperature detectors in safety devices, for example in a safety device intended to detect a draft anomaly in a gas boiler operating on a natural draft flue.
  • a safety device is designed to cut off the gas supply to the burner of the boiler, when the temperature is detected at an ambient air inlet of a draft stop device mounted above the boiler's heating body. , exceeds a predetermined limit which corresponds to a draft anomaly for the boiler in question. Beyond this limit, a release of combustion gases, containing carbon dioxide, may occur through the draft stop device in the room where the boiler is installed.
  • Such a safety device is also designed to restore the gas supply to the boiler burner with a certain delay, when the temperature has dropped to a value below the predetermined limit mentioned above, and corresponding to normal operation of the boiler. .
  • This delay must be such that the combustion gases which may have escaped into the ambient environment have had time to be reabsorbed in the flue to be evacuated, in order to avoid any risk of asphyxiation by the combustion gases in the room where the boiler is installed.
  • a draft European standard and a draft French standard concerning this type of safety device require, on the one hand, that the detector device react quickly to cut off the gas supply to the boiler burner in the event of a draft anomaly and, on the other hand, that it does not restore this gas supply until after a relatively long delay time to be certain that the combustion gases which have possibly escaped have had sufficient time to be reabsorbed in the smoke and evacuated outside the room where the boiler is located. More specifically, the draft standards are such that the gas supply must be cut off within a maximum of 3 min and the gas supply must not be restored before a minimum of 10 min after the cut .
  • the thermostat of the type described in the preamble which is a commercially available element, with a metal flange which is brought into thermal contact with the bimetallic element.
  • This collar extends well beyond the thermostat housing so as to favor heat exchanges between the bimetallic element of the thermostat and the environment. Tests carried out with such a thermostat showed that it had an excellent response time (around 5 s) to cause the gas supply to be cut off. On the other hand, it turned out that such a known thermostat, with or without the aforementioned collar, did not correspond to the above-mentioned standards for restoring the gas supply.
  • US-A-4,754,252 describes a thermostat of the kind in question, the housing of which has a cover provided with several orifices.
  • the cover is not made of an insulating material and it is not combined with the other elements of the thermostat in the same way as the cover of the thermostat of the present invention.
  • no chamber is formed in front of the bimetallic disc and the orifices in the cover are intended to provide an effect (reduction of the reaction time of the thermostat) which is the reverse of the effect sought by the present invention (increased reaction time for rearming).
  • the present invention therefore aims to provide a thermostat with automatic reset of the above-mentioned type, having a reset time substantially longer than those of known thermostats of the same type, while retaining a response time satisfying the above-mentioned standards. .
  • the thermostat according to the present invention is characterized in that it further comprises a cover made of insulating material, which is fixed to the housing so as to form with it a chamber in which the bimetallic element is located, in that that at least one orifice of small dimension relative to the dimension of the bimetallic element is formed in a wall of the cover and places said chamber in communication with the surrounding atmosphere, and in that the number, dimensions and arrangement orifice (s) and the dimensions of the chamber are chosen according to the desired response time for the cut-off and according to the desired delay for resetting after the cut-off.
  • the cover and its opening are designed and dimensioned so that the time necessary for the temperature of the bimetallic element to reach the first predetermined value in the event of an increase in the ambient temperature outside the cover is at most 3 min. , and that the time required for the temperature of the bimetallic element drops from the first predetermined value to the second predetermined value, ie at least 10 min in the case of the above-mentioned standards.
  • Figure 1 is a side elevational view of the thermostat and its cover in the disassembled state.
  • FIGS. 2 and 3 are end views of the cover respectively according to the arrows F and G of FIG. 1.
  • Figure 4 is a sectional view along the line IV-IV of Figure 1, showing, on a larger scale, the thermostat and the cover in the assembled state.
  • Figure 5 is a graph for comparing the operation of the thermostat of the present invention and the known thermostat.
  • the thermostat 1 shown in Figures 1 and 4 comprises, in known manner, a housing 2, for example of a synthetic resin, a fixed contact 3 and a movable contact 4 disposed in the housing 2, an end flange 5 closing the housing 2, a bimetallic element 6 having the shape of a disc convex towards the outside and mounted on the external face of the end flange 5, which has a recess 7, and a transmission axis 8 interposed between the bimetallic element 6 and the movable contact 4.
  • the transmission axis 8 is fixed, for example glued in the middle of the bimetallic element 6 and it can slide in a bore 9 formed in the middle of the end flange 5.
  • the housing 2, the end flange 5 and the bimetallic element 6 are held together by a metal ring or capsule 11 crimped around the housing 2.
  • the fixed contact 3 is formed in one piece with a conductor 12 which is partially embedded in the bottom of box 2 e t of which a part 12a projects outside of it to serve as a connection terminal.
  • the movable contact 4 is carried by a flexible switching arm 13a, which is an integral part of another suitably bent conductor 13, which is partly embedded in the bottom of the housing 2 and a portion 13b of which projects outside the housing 2 to serve as a connection terminal.
  • the thermostat 1 can be electrically connected by its connection terminals 12a and 13b to an external circuit intended to be controlled by the thermostat (for example the current supply circuit for the solenoid of a solenoid valve).
  • thermostat described so far with reference to Figures 1 and 4 is well known and is manufactured for example by the company ELWOOD SENSOR LTD and marketed under the serial number 2455 RBV.
  • a cover 14 which can be fixed to the thermostat 1 as will be described later.
  • an orifice 15 is formed substantially in the middle of the bottom wall 14a opposite the bimetallic element 6.
  • the peripheral wall 14b is of cylindrical shape when the housing 2 is itself cylindrical as in the example described here.
  • the wall 14b can be extended by a skirt 14c forming a sheath in which the housing 2 is slidably mounted.
  • a shoulder 16 is formed inside the cover 14 at the junction between its peripheral wall 14b and the skirt 14c extending it. As shown in FIG. 4, the shoulder 16 limits the penetration depth of the housing 2 in the sleeve skirt 14c and it defines the axial depth of the chamber 17 formed at the front of the housing 2 between the latter and the cover. 14.
  • the sleeve skirt 14c has a length corresponding to that of the housing 2 and it comprises, in the region of its free edge, at least one protuberance, preferably two protrusions 18, which radially project inwards.
  • the protuberance (s) 18 are designed to be able to yield elastically in order to allow the insertion of the housing 2 in the sleeve skirt 14c and they serve as retaining means for holding the housing 2 in the sleeve skirt after it has been inserted.
  • Each protrusion 18 can be bevelled as shown in FIG. 4 and is preferably formed integrally at one end of a flexible tongue 14d cut longitudinally in the sleeve skirt 14c as shown in FIG. 1.
  • the cover 14 may advantageously comprise, on its peripheral wall 14b, a foot 19 intended to allow the fixing of the cover 14 and of the thermostat 1 which it contains to an apparatus or other installation where the thermostat must be mounted.
  • thermostat 1 sold by the company ELWOOD SENSOR LTD under the serial number 2455 RBV 0864002 1/2 was used.
  • This thermostat 1 had the structure described above and represented in FIGS. 1 and 4.
  • the housing 2 of this thermostat has an outside diameter of approximately 18 mm, and the thermostat has a cut-off temperature threshold ⁇ 1 of approximately 46 ° C and a reset temperature threshold ⁇ 2 of around 38 ° C (the temperature threshold ⁇ 1 is the temperature at which the moving contact 4, which is normally closed at rest, opens under the action of a sudden reversal of curvature of the bimetallic element 6, while the temperature threshold ⁇ 2 is the temperature at which the movable contact 4 closes).
  • a cover 14 was used having the structure shown in Figures 1 to 4.
  • the cover was made of polysulfone and its walls 14a and 14b were 2 mm thick.
  • the chamber 17 had an internal diameter of 17 mm and an axial length of 8 mm, this length being measured between the wall 14a and the shoulder 16.
  • the orifice 15 had a diameter of approximately 4 mm.
  • the operation of this thermostat is illustrated by the graph in FIG. 5.
  • the characteristic A in dotted lines corresponds to the case where the thermostat 1 is used without the cover 14 in accordance with the prior art
  • the characteristic B in solid lines, corresponds to the case where the thermostat 1 is used with the cover 14 in accordance with the present invention.
  • the cut-out temperature threshold ⁇ 1 is reached after a few seconds in the case of the thermostat without cover (characteristic A) and after about 2 mn in the case of the thermostat with cover (characteristic B), which satisfies the above-mentioned standards in both cases.
  • the cut-out temperature threshold ⁇ 1 is reached after a few seconds in the case of the thermostat without cover (characteristic A) and after about 2 mn in the case of the thermostat with cover (characteristic B), which satisfies the above-mentioned standards in both cases.
  • each hole having a diameter smaller than that of the single hole 15.
  • they could be formed in the peripheral wall 14b of the cover.
  • the number, dimensions and arrangement of the holes, the material of the cover 14, its wall thickness, the internal diameter and the axial length of the chamber 17 may vary depending on the model of the thermostat 1 used and / or according to the desired response time for the cut-off and / or according to the desired delay for resetting after the cut-off, in other words according to the standards in force or the envisaged application.
  • the invention is applicable in all cases where the reset delay after cut-off must be significantly extended compared to the case where the thermostat is used without a cover.
  • the thermostat only has a fixed contact and a movable contact which is normally closed at rest, it could include, for other applications, a movable contact normally open at rest . According to another variant, it could include two fixed contacts and a movable contact, the latter being normally closed on one of the two fixed contacts when the thermostat is at rest, and being closed on the other fixed contact when the temperature threshold ⁇ 1 is reached.
  • the same thermostat can be used both to cut the gas supply to the boiler burner (in cutting the current supply to the solenoid of a solenoid valve placed in the gas supply line) and to produce an audible and / or light alarm signal in the event of a draft anomaly.

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Thermally Actuated Switches (AREA)

Claims (8)

  1. Thermostat mit automatischer Rückstellung, mit einem Gehäuse (2), wenigstens einem feststehenden Kontakt (3) und einem beweglichen Kontakt (13a, 4), die in dem Gehäuse angeordnet sind, um je nach der Position des beweglichen Kontaktes einen elektrischen Stromkreis zu schließen oder zu unterbrechen, wenigstens zwei Leiteranschlüssen (12, 13), die jeweils mit dem feststehenden und dem mobilen Kontakt verbunden sind, um diese an einen äußeren Stromkreis anzuschließen, einem wärmeverformbaren Bimetallelement (6), das auf einer Endfläche (5) des Gehäuses (2) angebracht ist und das sich schlagartig von einer Ruheposition in eine verformte Position bewegt, wenn seine Temperatur einen ersten vorbestimmten Wert P1 erreicht, und sich in seine Ruheposition zurückbewegt, wenn seine Temperatur auf einen zweiten vorbestimmten Wert P2, unterhalb des ersten Wertes, abfällt, und einem Übertragungselement (8), das zwischen dem Bimetallelement (6) und dem beweglichen Kontakt (13a, 4) angeordnet ist, um diesen zu betätigen, wenn sich das Bimetallelement aus seiner Ruheposition in die verformte Position und umgekehrt bewegt, dadurch gekennzeichnet, daß er ferner eine Abdeckung (14) aus Isoliermaterial aufweist, die am Gehäuse (2) derart befestigt ist, daß sie mit diesem eine Kammer (17) bildet, in welcher das Bimetallelement (6) angeordnet ist, und daß mindestens eine Öffnung (15) von geringer Größe im Vergleich zur Abmessung des Bimetallelementes in einer Wandung (14a) der Abdeckung (14) ausgebildet ist und die Kammer (17) mit der Umgebungsluft in Verbindung bringt, und daß die Zahl, die Abmessungen und die Anordnung der Öffnung oder Öffnungen (15) und die Abmessung der Kammer (17) entsprechend der gewünschten Ansprechzeit für das Unterbrechen und der gewünschten Verzögerungszeit für das Rückstellen nach dem Unterbrechen gewählt sind.
  2. Thermostat nach Anspruch 1, dadurch gekennzeichnet, daß die Abdeckung (14) eine Bodenwand (14a), die sich in einem Abstand parallel zu der das Bimetallelement (6) tragenden Endfläche (5) des Gehäuses (2) erstreckt, und eine Umfangswand (14b), die sich an das Gehäuse (2) anschließt, umfaßt, und daß die Öffnung (15) im wesentlichen in der Mitte der Bodenwand (14a) gegenüber dem Bimetallelement (6) ausgebildet ist.
  3. Thermostat nach Anspruch 2, dadurch gekennzeichnet, daß die Umfangswand (14b) der Abdeckung (14) durch eine Schürze (14c) verlängert ist, die eine Hülse bildet, in welcher das Gehäuse (2) gleitend eingesetzt ist.
  4. Thermostat nach Anspruch 3, dadurch gekennzeichnet, daß eine Schulter (16) an der Verbindung zwischen der Umfangswand (14b) der Abdeckung (14) und der Hülsenschürze (14c) ausgebildet ist, wobei die Schulter die Eindringtiefe des Gehäuses (2) in die Hülsenschürze begrenzt und die axiale Ausdehnung der Kammer (17) festlegt.
  5. Thermostat nach Anspruch 4, dadurch gekennzeichnet, daß die Hülsenschürze (14c) eine dem Gehäuse (2) entsprechende Länge hat, und daß sie in dem Bereich ihrer freien Kante wenigstens eine Wulst (18) umfaßt, die radial zum Inneren des Gehäuses hin vorsteht, elastisch nachgeben kann, um das Einführen des Gehäuses in die Hülsenschürze zuzulassen, und als Rückhaltemittel dient, um das Gehäuse in der Hülsenschürze festzuhalten, nachdem es dort eingeführt worden ist.
  6. Thermostat nach Anspruch 5, dadurch gekennzeichnet, daß die Wulst (18) an einem Ende einer flexiblen Zunge (14d) ausgebildet ist, die in Längsrichtung in der Hülsenschürze (14c) ausgeschnitten ist.
  7. Thermostat nach einem der Ansprüche 1-6, dadurch gekennzeichnet, daß die Abdeckung (14) auf ihrer Umfangswand (14b) einen Befestigungsfuß (19) umfaßt.
  8. Thermostat nach einem der Ansprüche 1-7, dadurch gekennzeichnet, daß für ein Gehäuse (2) mit einem Durchmesser von etwa 18 mm die Kammer (17) einen Innendurchmesser von etwa 17 mm, eine axiale Länge von etwa 8 mm, eine Wandungsstärke von etwa 2 mm hat, und daß die Öffnung (15) einen Durchmesser von etwa 4 mm hat.
EP19930400439 1992-03-04 1993-02-19 Thermostat mit automatischer Rückstellung Expired - Lifetime EP0559517B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9202602 1992-03-04
FR9202602A FR2688340A1 (fr) 1992-03-04 1992-03-04 Thermostat a rearmement automatique.

Publications (2)

Publication Number Publication Date
EP0559517A1 EP0559517A1 (de) 1993-09-08
EP0559517B1 true EP0559517B1 (de) 1996-07-17

Family

ID=9427356

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930400439 Expired - Lifetime EP0559517B1 (de) 1992-03-04 1993-02-19 Thermostat mit automatischer Rückstellung

Country Status (4)

Country Link
EP (1) EP0559517B1 (de)
DE (2) DE559517T1 (de)
ES (1) ES2046161T3 (de)
FR (1) FR2688340A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2290415B (en) * 1994-06-15 1998-05-06 Creda Ltd Thermostatic switches for electric storage heaters

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2316718A1 (fr) * 1975-06-30 1977-01-28 Ferodo Sa Perfectionnements au montage d'un thermo-contact dans une paroi
DE3304126C2 (de) * 1983-02-08 1985-07-25 Inter Control Hermann Köhler Elektrik GmbH & Co KG, 8500 Nürnberg Bimetallgesteuerter Sprungscheiben-Thermoschalter
EP0187480A1 (de) * 1984-12-05 1986-07-16 Elmwood Sensors Limited Temperaturempfindlicher Schalter
US4754252A (en) * 1987-06-02 1988-06-28 Elmwood Sensors, Inc. Thermostatic switch with improved cap disc assembly
US4952901A (en) * 1989-12-22 1990-08-28 Elmwood Sensors, Inc. Bimetallic disc assembly for thermostatic switch and disc retainer therefor

Also Published As

Publication number Publication date
DE559517T1 (de) 1994-02-03
DE69303639T2 (de) 1997-02-06
ES2046161T1 (es) 1994-02-01
ES2046161T3 (es) 1996-10-16
DE69303639D1 (de) 1996-08-22
EP0559517A1 (de) 1993-09-08
FR2688340A1 (fr) 1993-09-10
FR2688340B1 (de) 1997-02-14

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