EP0727798B1 - Thermal contactor with trip delay - Google Patents
Thermal contactor with trip delay Download PDFInfo
- Publication number
- EP0727798B1 EP0727798B1 EP19960400314 EP96400314A EP0727798B1 EP 0727798 B1 EP0727798 B1 EP 0727798B1 EP 19960400314 EP19960400314 EP 19960400314 EP 96400314 A EP96400314 A EP 96400314A EP 0727798 B1 EP0727798 B1 EP 0727798B1
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- EP
- European Patent Office
- Prior art keywords
- temperature
- liquid
- contact pad
- moving contact
- sensitive 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
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H43/00—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed
- H01H43/30—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to thermal action
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- 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
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H7/00—Devices for introducing a predetermined time delay between the initiation of the switching operation and the opening or closing of the contacts
- H01H7/08—Devices for introducing a predetermined time delay between the initiation of the switching operation and the opening or closing of the contacts with timing by mechanical speed-control devices
Definitions
- the present invention relates to a thermal contactor with delayed release, fitted with an electric element heating.
- the heat energy provided, said heat sensitive element, by the electric element heating causes the progressive variation of the element sensitive to heat which, at a determined temperature, acts on said mobile contact pad to do so move from one of its positions, constituting the position of rest, to the other of its positions, constituting the position of work.
- the delay in tripping of said contactors therefore corresponds to the time required for said element sensitive to the temperature to go from its rest state to that corresponding to said determined temperature.
- thermal contactors Thanks to such thermal contactors, it is possible, in current technology, to get delays at trigger between 5 and 120 seconds.
- the object of the present invention is to allow the realization of a contactor of the type of that of document US-A-3 845 440, having a simple structure, a low cost and precise trigger delay and great duration.
- the temperature of said liquid and its environment is limited to the evaporation temperature of this liquid, insufficient for said element sensitive to temperature acts on said contact pad mobile to make it change position.
- the duration of the delay in tripping of said contactor is determined by the nature of the liquid (its specific heat), the volume of said liquid initially found in the reserve and the amount of heat provided by said heating element. These three parameters are easy to adjust, so that the trigger delay time can be set to a high value, with tight tolerances. In addition, as a same volume of the same liquid always requires the same amount of energy, the duration of said delay is always the same, if the amount of heat provided by said heating element remains constant from one trigger to another.
- said contact pads fixed and mobile and said temperature sensitive element are enclosed in a case, said liquid reserve evaporable, united or attached to said housing, is in close thermal contact with the interior volume of said housing.
- said temperature sensitive element is an element deformable bimetallic, for example in the form of a disc, and it at least partially ensures good thermal contact between said liquid reserve and the interior volume of said housing.
- the heating element can be either in said reserve, for example in direct contact with the evaporable liquid and / or said bimetallic element, either in said housing, preferably in direct contact with said bimetallic element.
- said movable contact pad is mounted at the free end of an elastic metal blade and that said temperature sensitive element acts on said elastic blade for changing said contact pad position mobile, via a sliding rod whose ends are respectively in support against said temperature sensitive element and against said elastic blade, it is advantageous that said rod sliding either electrically conductive or formed by an electrical resistance constituting said electric heating element.
- said sliding rod ensures the electrical connection between said element sensitive to the temperature and said elastic blade, while in the second case, while ensuring said electrical connection, said electrical resistance is not an element reported requiring additional bulk, but getting accommodates in place of the usual sliding rod and fills, at at the same time, the mechanical connection function between said blade elastic and said temperature sensitive element and the heating function of the latter (as well as of the liquid).
- said resistance electric comes in the known form of a body electrically insulating, provided with two electrically connected ends conductors at the ends of said body.
- the electrical supply of said resistor can on one side, from the terminal intended for supply said mobile contact pad and, on the other side, from an additional electrically connected terminal said bimetallic element.
- said cover is further arranged to allow the sliding of said rod.
- the contactor according to the present invention can be used in many applications as a timer or liquid detector.
- it can be implemented in coffee makers, humidifiers, irons steam, air conditioners, etc ...
- the contactor according to the present invention allows the detection of a liquid circulating in a tube. For this do, it suffices that said reservation is in communication with the interior of said tube so that it is filled with liquid as long as it circulates in the tube. At the end of the circulation of the liquid in the tube, the contactor according to the invention will be triggered, as soon as the liquid contained in said reserve will be evaporated.
- Figure 1 is an axial sectional view of an embodiment of the thermal contactor in accordance with this invention, this section corresponding to line I-I of the figure 2.
- Figure 2 is a cross-sectional view, along the line II-II of figure 1.
- Figure 3 is an axial sectional view of a variant of realization of the contactor in accordance with the present invention, this section corresponding to line III-III of FIG. 4.
- Figure 4 is an elevational view of the contactor of the figure 3.
- contactor according to the invention could be of the delayed closing type : it would be enough to modify the relative position fixed and mobile studs.
- the contactor according to the invention comprises a housing consisting of a receptacle 1 closable by a cover 2 fixed on said receptacle 1 by a crimping capsule 3.
- a receptacle 1 closable by a cover 2 fixed on said receptacle 1 by a crimping capsule 3.
- three lugs 4.1, 4.2 and 4.3 are provided, for example arranged at 120 ° from each other around the X-X axis of said housing.
- Each of the terminals 4.1, 4.2 and 4.3 is fixed to the bottom of the said receptacle via a respective rivet 5.1, 5.2, 5.3.
- Rivets 5.1 and 5.3 keep prisoners respectively an elastic metal blade 6 and a metal plate rigid 7.
- the blade 6 carries a stud movable contact 8, while the rigid plate 7 carries a fixed contact pad 9.
- the mobile contact pad 8 is applied elastically against the fixed contact pad 9 by action of elasticity blade 6.
- a sliding hub 10 is arranged. in which a metal rod 11 is slidably housed, electrically conductive.
- the end 13 of the sliding rod 11 is in contact mechanical with elastic metal blade 6.
- the other end 14 of the sliding rod 11 is in mechanical contact with a bimetallic disc 15, arranged in a recess 16 made in the part of the cover 2 opposite receptacle 1.
- said capsule crimping 3 is shaped into a capacity 18, of volume calibrated, likely to contain a reserve of liquid, by example of water.
- an electrical resistance 19 is provided in said capacity 18.
- One end of the resistor electric 19 is electrically connected to the terminal 4.2 via a tab 17.
- the other end of the electrical resistance 19 is connected to the terminal 4.1, by through the bimetallic disc 15, the rod 11, blade 6 and rivet 4.1.
- the rest position of the contactor is that shown in Figure 1, in which the movable contact pad 8 is in elastic support against the fixed contact pad 9.
- the contactor is intended to control the passage of current between said fixed contact pads and mobile, i.e. between terminals 4.1 and 4.3.
- the progressive contribution of heat by the resistance 19 leads gradual evaporation of the liquid contained in the capacity 18 with maintaining the temperature of the bimetallic disc 15 to a value lower than that of the trigger. Then, when all of the liquid in cavity 18 is evaporated, resistor 19 directly heats the disc bimetallic 15 which then undergoes a temperature increase and a deformation such that it pushes the rod 11 to against the elastic action of the blade 6, so that the movable contact pad 8 is moved away from the contact pad fixed 9, which interrupts the electrical connection between the terminal 4.1 and terminal 4.3.
- the capacity 18 (which acts as a simple fitting end piece) can be fitted to a reservoir 23, integral with a tube 24 and open towards the inside thereof.
- the tube 24 can be part of a circulation circuit of a liquid, for example water.
- the reservoir 23 is supplied with liquid and filled with it, for example under the action of gravity. At the end of the circulation of said liquid, said reservoir 23 remains full. If a potential difference is applied between the terminals 4.1 and 4.2, a current is generated which follows a path passing through the terminal 4.1, the rivet 5.1, the blade 6, the resistance 20, the bimetallic disc 15, the tongue 17 and the terminal 4.2. The heat generated by the Joule effect by the resistance 20 is transmitted to the liquid in reservoir 23, at through the bimetallic disc 15 and the bottom 25.
- the electrical contact between pads 8 and 9 is opened after a delay corresponding to the duration for evaporating the liquid from the reservoir 23, increased of that necessary for said bimetallic disc 15 repels resistance 20 enough (which therefore fills the office of the rod 11), so that this resistor 20 opens the contact.
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- Thermally Actuated Switches (AREA)
Description
La présente invention concerne un contacteur thermique à déclenchement retardé, pourvu d'un élément électrique chauffant.The present invention relates to a thermal contactor with delayed release, fitted with an electric element heating.
Dans la technique antérieure, on connaít déjà un contacteur thermique à déclenchement retardé, comportant :
- un plot de contact fixe ;
- un plot de contact mobile pouvant occuper l'une ou l'autre de deux positions, pour l'une desquelles ledit plot de contact mobile est en appui contre ledit plot de contact fixe en établissant un contact électrique entre lesdits plots de contact fixe et mobile, tandis que, pour l'autre desdites positions, ledit plot de contact mobile est écarté dudit plot de contact fixe en ouvrant le contact électrique entre lesdits plots de contact fixe et mobile ;
- un élément sensible à la température et susceptible d'agir sur ledit plot de contact mobile pour le faire changer de position, lorsque la température dudit élément sensible à la température atteint une valeur de déclenchement ; et
- un élément électrique chauffant pour chauffer ledit élément sensible à la température.
- a fixed contact pad;
- a movable contact pad which can occupy one or the other of two positions, for one of which said movable contact pad is in abutment against said fixed contact pad by establishing an electrical contact between said fixed and movable contact pads , while, for the other of said positions, said movable contact pad is moved away from said fixed contact pad by opening the electrical contact between said fixed and movable contact pads;
- a temperature sensitive element capable of acting on said movable contact pad to make it change position, when the temperature of said temperature sensitive element reaches a trigger value; and
- an electric heating element for heating said temperature sensitive element.
Dans ces contacteurs connus, l'énergie calorifique apportée, audit élément sensible à la chaleur, par l'élément électrique chauffant, entraíne la variation progressive de l'élément sensible à la chaleur qui, à une température déterminée, agit sur ledit plot de contact mobile pour le faire passer de l'une de ses positions, constituant la position de repos, à l'autre de ses positions, constituant la position de travail. Le retard de déclenchement desdits contacteurs correspond donc au temps nécessaire audit élément sensible à la température pour passer de son état de repos à celui correspondant à ladite température déterminée.In these known contactors, the heat energy provided, said heat sensitive element, by the electric element heating, causes the progressive variation of the element sensitive to heat which, at a determined temperature, acts on said mobile contact pad to do so move from one of its positions, constituting the position of rest, to the other of its positions, constituting the position of work. The delay in tripping of said contactors therefore corresponds to the time required for said element sensitive to the temperature to go from its rest state to that corresponding to said determined temperature.
Grâce à de tels contacteurs thermiques, il est possible, dans la technologie actuelle, d'obtenir des retards au déclenchement compris entre 5 et 120 secondes.Thanks to such thermal contactors, it is possible, in current technology, to get delays at trigger between 5 and 120 seconds.
Pour de nombreuses applications, de tels retards de déclenchement sont insuffisants.For many applications, such trigger delays are insufficient.
Par ailleurs, le brevet américain US-A-3 845 440 concerne un contacteur thermique du type connu rappelé ci-dessus, dans lequel on met en oeuvre le changement d'état d'une matière pour obtenir ledit retard de déclenchement. Dans ce contacteur retardé, l'élément électrique chauffant est séparé dudit élément sensible par une réserve calibrée close contenant ladite matière à changement d'état, par exemple un liquide évaporable. Il résulte de cette disposition une faible précision de déclenchement et des perturbations dans le cycle liquide-vapeur-liquide d'un tel liquide évaporable.Furthermore, American patent US-A-3 845 440 relates to a thermal contactor of the known type mentioned above, in which one implements the change of state of a matter to obtain said trigger delay. In this contactor delayed, the electric heating element is separated of said sensitive element by a closed calibrated reserve containing said change of state material, for example a evaporable liquid. It follows from this provision a low trigger accuracy and disturbances in the liquid-vapor-liquid cycle of such an evaporable liquid.
Par conséquent, l'objet de la présente invention est de permettre la réalisation d'un contacteur du type de celui du document US-A-3 845 440, ayant une structure simple, un faible coût et un retard de déclenchement précis et de grande durée.Therefore, the object of the present invention is to allow the realization of a contactor of the type of that of document US-A-3 845 440, having a simple structure, a low cost and precise trigger delay and great duration.
A cette fin, selon l'invention, le contacteur thermique à déclenchement retardé, comportant :
- un plot de contact fixe ;
- un plot de contact mobile pouvant occuper l'une ou l'autre de deux positions, pour l'une desquelles ledit plot de contact mobile est en appui contre ledit plot de contact fixe en établissant un contact électrique entre lesdits plots de contact fixe et mobile, tandis que, pour l'autre desdites positions, ledit plot de contact mobile est écarté dudit plot de contact fixe en ouvrant le contact électrique entre lesdits plots de contact fixe et mobile ;
- un élément sensible à la température et susceptible d'agir sur ledit plot de contact mobile pour le faire changer de position, lorsque la température dudit élément sensible à la température atteint une valeur de déclenchement ;
- un élément électrique chauffant pour chauffer ledit élément sensible à la température ; et
- une réserve calibrée d'un liquide également chauffé par ledit élément électrique chauffant et évaporable sous l'action de la chaleur qui lui est adressée par ledit élément chauffant,
- a fixed contact pad;
- a movable contact pad which can occupy one or the other of two positions, for one of which said movable contact pad is in abutment against said fixed contact pad by establishing an electrical contact between said fixed and movable contact pads , while, for the other of said positions, said movable contact pad is moved away from said fixed contact pad by opening the electrical contact between said fixed and movable contact pads;
- a temperature sensitive element capable of acting on said movable contact pad to make it change position, when the temperature of said temperature sensitive element reaches a trigger value ;
- an electric heating element for heating said temperature sensitive element; and
- a calibrated reserve of a liquid also heated by said electric heating element and evaporable under the action of the heat which is sent to it by said heating element,
Ainsi, tant que du liquide se trouve dans ladite réserve, la température dudit liquide et de son environnement (le contacteur thermique) est limitée à la température d'évaporation de ce liquide, insuffisante pour que ledit élément sensible à la température agisse sur ledit plot de contact mobile pour le faire changer de position.Thus, as long as liquid is in said reserve, the temperature of said liquid and its environment (the thermal contactor) is limited to the evaporation temperature of this liquid, insufficient for said element sensitive to temperature acts on said contact pad mobile to make it change position.
En revanche, dès que la totalité du liquide de la réserve est évaporé, la température du contacteur thermique augmente rapidement et ledit élément sensible à la température agit sur ledit plot de contact mobile. However, as soon as all the cash in the reserve is evaporated, the temperature of the thermal contactor increases quickly and said temperature sensitive element acts on said mobile contact pad.
On conçoit aisément que, dans ces conditions, la durée du retard au déclenchement dudit contacteur est déterminée par la nature dudit liquide (sa chaleur spécifique), le volume dudit liquide se trouvant initialement dans la réserve et la quantité de chaleur apportée par ledit élément chauffant. Ces trois paramètres sont faciles à régler, de sorte que la durée du retard au déclenchement peut être réglée à une valeur élevée, avec d'étroites tolérances. De plus, comme un même volume d'un même liquide exige toujours la même quantité d'énergie, la durée dudit retard est toujours la même, si la quantité de chaleur apportée par ledit élément chauffant reste constante d'un déclenchement à un autre.It is easy to see that, under these conditions, the duration of the delay in tripping of said contactor is determined by the nature of the liquid (its specific heat), the volume of said liquid initially found in the reserve and the amount of heat provided by said heating element. These three parameters are easy to adjust, so that the trigger delay time can be set to a high value, with tight tolerances. In addition, as a same volume of the same liquid always requires the same amount of energy, the duration of said delay is always the same, if the amount of heat provided by said heating element remains constant from one trigger to another.
Bien entendu, pour un bon fonctionnement dudit contacteur conforme à la présente invention, il est indispensable d'établir un bon couplage thermique entre le liquide évaporable, l'élément électrique chauffant et l'élément sensible à la température.Of course, for proper operation of said contactor in accordance with the present invention, it is essential establish a good thermal coupling between the evaporable liquid, the electric heating element and the sensitive element at temperature.
A cet effet, si, de façon connue, lesdits plots de contact fixe et mobile et ledit élément sensible à la température sont enfermés dans un boítier, ladite réserve de liquide évaporable, solidaire ou rapportée audit boítier, est en contact thermique étroit avec le volume intérieur dudit boítier.To this end, if, in known manner, said contact pads fixed and mobile and said temperature sensitive element are enclosed in a case, said liquid reserve evaporable, united or attached to said housing, is in close thermal contact with the interior volume of said housing.
Dans un mode de réalisation particulièrement avantageux, ledit élément sensible à la température est un élément déformable bimétallique, par exemple en forme de disque, et il assure au moins partiellement le bon contact thermique entre ladite réserve de liquide et le volume intérieur dudit boítier.In a particularly advantageous embodiment, said temperature sensitive element is an element deformable bimetallic, for example in the form of a disc, and it at least partially ensures good thermal contact between said liquid reserve and the interior volume of said housing.
L'élément chauffant peut se trouver soit dans ladite réserve, par exemple au contact direct du liquide évaporable et/ou dudit élément bimétallique, soit dans ledit boítier, de préférence au contact direct dudit élément bimétallique.The heating element can be either in said reserve, for example in direct contact with the evaporable liquid and / or said bimetallic element, either in said housing, preferably in direct contact with said bimetallic element.
Lorsque, de façon connue, ledit plot de contact mobile est monté à l'extrémité libre d'une lame métallique élastique et que ledit élément sensible à la température agit sur ladite lame élastique pour faire changer ledit plot de contact mobile de position, par l'intermédiaire d'une tige coulissante dont les extrémités sont respectivement en appui contre ledit élément sensible à la température et contre ladite lame élastique, il est avantageux que ladite tige coulissante soit ou bien électriquement conductrice, ou bien formée par une résistance électrique constituant ledit élément électrique chauffant.When, in known manner, said movable contact pad is mounted at the free end of an elastic metal blade and that said temperature sensitive element acts on said elastic blade for changing said contact pad position mobile, via a sliding rod whose ends are respectively in support against said temperature sensitive element and against said elastic blade, it is advantageous that said rod sliding either electrically conductive or formed by an electrical resistance constituting said electric heating element.
Ainsi, dans le premier cas, ladite tige coulissante assure la liaison électrique entre ledit élément sensible à la température et ladite lame élastique, tandis que, dans le second cas, tout en assurant ladite liaison électrique, ladite résistance électrique ne constitue pas un élément rapporté nécessitant un encombrement supplémentaire, mais se loge à la place de la tige coulissante usuelle et remplit, à la fois, la fonction de liaison mécanique entre ladite lame élastique et ledit élément sensible à la température et la fonction de chauffage de ce dernier (ainsi que du liquide).Thus, in the first case, said sliding rod ensures the electrical connection between said element sensitive to the temperature and said elastic blade, while in the second case, while ensuring said electrical connection, said electrical resistance is not an element reported requiring additional bulk, but getting accommodates in place of the usual sliding rod and fills, at at the same time, the mechanical connection function between said blade elastic and said temperature sensitive element and the heating function of the latter (as well as of the liquid).
Il est avantageux, dans ces conditions, que ladite résistance électrique se présente sous la forme connue d'un corps électriquement isolant, pourvu de deux embouts électriquement conducteurs aux extrémités dudit corps.It is advantageous, under these conditions, that said resistance electric comes in the known form of a body electrically insulating, provided with two electrically connected ends conductors at the ends of said body.
Ainsi, l'alimentation électrique de ladite résistance peut s'effectuer, d'un côté, à partir de la cosse destinée à alimenter ledit plot de contact mobile et, de l'autre côté, à partir d'une cosse supplémentaire reliée électriquement audit élément bimétallique. Thus, the electrical supply of said resistor can on one side, from the terminal intended for supply said mobile contact pad and, on the other side, from an additional electrically connected terminal said bimetallic element.
Dans un mode de réalisation particulièrement avantageux, le boítier du contacteur thermique conforme à la présente invention comporte :
- un réceptacle auquel sont liés les plots de contact fixe et mobile ainsi que trois cosses, respectivement destinées à l'alimentation du plot de contact fixe, à l'alimentation commune du plot de contact mobile et d'une extrémité dudit élément électrique chauffant et à l'alimentation de l'autre extrémité dudit élément électrique chauffant ; et
- un couvercle susceptible d'obturer ledit réceptacle et aménagé pour y loger l'élément déformable bimétallique et pour être relié à ladite réserve de liquide.
- a receptacle to which the fixed and movable contact pads are linked as well as three lugs, respectively intended for supplying the fixed contact pad, for common supply of the movable contact pad and of one end of said electric heating element and to supplying the other end of said electric heating element; and
- a cover capable of closing off said receptacle and arranged to accommodate therein the deformable bimetallic element and to be connected to said reserve of liquid.
Dans le mode de réalisation à tige coulissante mentionné ci-dessus, ledit couvercle est de plus aménagé pour permettre le coulissement de ladite tige.In the mentioned sliding rod embodiment above, said cover is further arranged to allow the sliding of said rod.
Le contacteur conforme à la présente invention peut être utilisé dans de nombreuses applications comme temporisateur ou détecteur de liquide. Notamment, dans le domaine des appareils électroménagers, il peut être mis en oeuvre dans les cafetières, les humidificateurs, les fers à repasser à vapeur, les climatiseurs, etc ...The contactor according to the present invention can be used in many applications as a timer or liquid detector. In particular, in the field of household appliances, it can be implemented in coffee makers, humidifiers, irons steam, air conditioners, etc ...
Dans une utilisation particulièrement intéressante, le contacteur conforme à la présente invention permet la détection d'un liquide circulant dans un tube. Pour ce faire, il suffit que ladite réserve soit en communication avec l'intérieur dudit tube de façon qu'elle soit remplie de liquide tant que celui-ci circule dans le tube. A la fin de la circulation du liquide dans le tube, le contacteur selon l'invention se déclenchera, dès que le liquide contenu dans ladite réserve sera évaporé. In a particularly interesting use, the contactor according to the present invention allows the detection of a liquid circulating in a tube. For this do, it suffices that said reservation is in communication with the interior of said tube so that it is filled with liquid as long as it circulates in the tube. At the end of the circulation of the liquid in the tube, the contactor according to the invention will be triggered, as soon as the liquid contained in said reserve will be evaporated.
Les figures du dessin annexé feront bien comprendre comment l'invention peut être réalisée. Sur ces figures, des références identiques désignent des éléments semblables.The figures in the accompanying drawing will make it clear how the invention can be realized. In these figures, references identical denote similar elements.
La figure 1 est une vue en coupe axiale d'un mode de réalisation du contacteur thermique conforme à la présente invention, cette coupe correspondant à la ligne I-I de la figure 2.Figure 1 is an axial sectional view of an embodiment of the thermal contactor in accordance with this invention, this section corresponding to line I-I of the figure 2.
La figure 2 est une vue en coupe transversale, selon la ligne II-II de la figure 1.Figure 2 is a cross-sectional view, along the line II-II of figure 1.
La figure 3 est une vue en coupe axiale d'une variante de réalisation du contacteur conforme à la présente invention, cette coupe correspondant à la ligne III-III de la figure 4.Figure 3 is an axial sectional view of a variant of realization of the contactor in accordance with the present invention, this section corresponding to line III-III of FIG. 4.
La figure 4 est une vue en élévation du contacteur de la figure 3.Figure 4 is an elevational view of the contactor of the figure 3.
Les exemples de réalisation de contacteurs thermiques conformes à l'invention et illustrés par les figures 1 à 4 ont été choisis du type à ouverture retardée.Examples of realization of thermal contactors according to the invention and illustrated by Figures 1 to 4 were chosen of the delayed opening type.
On comprendra aisément de ce qui va suivre que le contacteur selon l'invention pourrait être du type à fermeture retardée : il suffirait pour cela de modifier la position relative des plots fixe et mobile.It will be readily understood from what follows that the contactor according to the invention could be of the delayed closing type : it would be enough to modify the relative position fixed and mobile studs.
Sur les figures 1 et 2, on peut voir que le contacteur
conforme à l'invention comporte un boítier constitué d'un
réceptacle 1 obturable par un couvercle 2 fixé sur ledit
réceptacle 1 par une capsule de sertissage 3. Dans le fond
du réceptacle 1, sont prévues trois cosses 4.1, 4.2 et 4.3,
par exemple disposées à 120° l'une de l'autre autour de
l'axe X-X dudit boítier. In Figures 1 and 2, we can see that the contactor
according to the invention comprises a housing consisting of a
Chacune des cosses 4.1, 4.2 et 4.3 est fixée au fond dudit réceptacle par l'intermédiaire d'un rivet respectif 5.1, 5.2, 5.3.Each of the terminals 4.1, 4.2 and 4.3 is fixed to the bottom of the said receptacle via a respective rivet 5.1, 5.2, 5.3.
Les rivets 5.1 et 5.3 maintiennent prisonniers respectivement
une lame métallique élastique 6 et une plaque métallique
rigide 7.Rivets 5.1 and 5.3 keep prisoners respectively
an
A leurs extrémités en regard, la lame 6 porte un plot de
contact mobile 8, tandis que la plaque rigide 7 porte un
plot de contact fixe 9.At their opposite ends, the
En position de repos du contacteur conforme à l'invention,
le plot de contact mobile 8 est appliqué élastiquement
contre le plot de contact fixe 9 par action de l'élasticité
de la lame 6.In the rest position of the contactor according to the invention,
the
Dans le couvercle 2, est aménagé un moyeu de coulissement 10
dans lequel est logée à coulissement une tige métallique 11,
électriquement conductrice.In the
L'extrémité 13 de la tige coulissante 11 est en contact
mécanique avec la lame métallique élastique 6.The
De même, l'autre extrémité 14 de la tige coulissante 11 est
en contact mécanique avec un disque bimétallique 15, disposé
dans un évidement 16 pratiqué dans la partie du couvercle 2
opposée au réceptacle 1.Similarly, the
Par ailleurs, du côté opposé au réceptacle 1, ladite capsule
de sertissage 3 est conformée en une capacité 18, de volume
calibré, susceptible de contenir une réserve de liquide, par
exemple de l'eau. En contact mécanique direct avec ledit
disque bimétallique 15, une résistance électrique 19 est
prévue dans ladite capacité 18. Une extrémité de la résistance
électrique 19 est électriquement reliée à la cosse 4.2
par l'intermédiaire d'une languette 17. L'autre extrémité de
la résistance électrique 19 est reliée à la cosse 4.1, par
l'intermédiaire du disque bimétallique 15, de la tige 11, de
la lame 6 et du rivet 4.1.Furthermore, on the side opposite to
Comme on l'a mentionné ci-dessus, la position de repos du
contacteur est celle représentée sur la figure 1, dans
laquelle le plot de contact mobile 8 est en appui élastique
contre le plot de contact fixe 9.As mentioned above, the rest position of the
contactor is that shown in Figure 1, in
which the
Bien entendu, le contacteur est destiné à commander le passage du courant entre lesdits plots de contact fixe et mobile, c'est-à-dire entre les cosses 4.1 et 4.3.Of course, the contactor is intended to control the passage of current between said fixed contact pads and mobile, i.e. between terminals 4.1 and 4.3.
Si, après avoir rempli la cavité 18 d'un liquide tel que
l'eau, on applique une différence de potentiel entre les
cosses 4.1 et 4.2, on engendre un courant dont le trajet
passe par la cosse 4.1, le rivet conducteur 5.1, la lame 6,
la tige 11, le disque bimétallique 15, la résistance 19, la
languette 17 et la cosse 4.2. Ce courant, par effet Joule,
engendre de la chaleur dans la résistance 19, cette chaleur
chauffant le disque bimétallique 15 et le liquide contenu
dans la capacité 18.If, after filling the
L'apport progressif de chaleur par la résistance 19 entraíne
l'évaporation progressive du liquide contenu dans la capacité
18 avec maintien de la température du disque bimétallique
15 à une valeur inférieure à celle du déclenchement. Ensuite,
lorsque la totalité du liquide de la cavité 18 est
évaporée, la résistance 19 chauffe directement le disque
bimétallique 15 qui subit alors une augmentation de température
et une déformation telles qu'il repousse la tige 11 à
l'encontre de l'action élastique de la lame 6, de sorte que
le plot de contact mobile 8 est écarté du plot de contact
fixe 9, ce qui interrompt la liaison électrique entre la
cosse 4.1 et la cosse 4.3. The progressive contribution of heat by the
Inversement, lorsque le courant traversant la résistance 19
cesse, le disque bimétallique 15 se refroidit progressivement,
de sorte qu'il reprend sa position initiale de la
figure 1, la lame élastique 6 ramenant le plot de contact
mobile 8 contre le plot de contact fixe 9 et repoussant la
tige 11 contre le disque bimétallique 15.Conversely, when the current passing through the
Dans le mode de réalisation des figures 1 et 2, on voit que
le disque bimétallique 15, le liquide contenu dans la
capacité 18 et la résistance 19 sont en contact physique
étroit entre eux, de sorte que le contact thermique est
excellent.In the embodiment of Figures 1 and 2, we see that
the
Dans le mode de réalisation des figures 3 et 4, on retrouve les éléments 1 à 3, 4.1, 4.2, 4.3, 5.1, 5.2, 5.3, 6 à 10 et 15 à 18 des figures 1 et 2. Cependant, par rapport au mode de réalisation des figures 1 et 2 :
- la tige 11 est remplacée par une résistance pourvu d'un
corps 20 portant des embouts ou capuchons conducteurs 21
et 22 à ses extrémités, l'embout 21 étant en contact
mécanique et électrique avec la
lame élastique 6 et l'embout 22 étant en contact mécanique et électrique avec le disque bimétallique 15 ; la résistance 19 est supprimée ; et- la languette 17 établit le contact électrique entre la cosse 4.2 et le disque bimétallique 15.
- the
rod 11 is replaced by a resistor provided with abody 20 carrying ferrules or 21 and 22 at its ends, theconductive caps ferrule 21 being in mechanical and electrical contact with theelastic blade 6 and theferrule 22 being in contact mechanical and electrical with thebimetallic disc 15; -
resistance 19 is eliminated; and - the
tongue 17 establishes the electrical contact between the terminal 4.2 and thebimetallic disc 15.
Par ailleurs, la capacité 18 (qui fait office de simple
embout de raccord) est emboítable sur un réservoir 23,
solidaire d'un tube 24 et ouvert vers l'intérieur de celui-ci.
Le tube 24 peut faire partie d'un circuit de circulation
d'un liquide, par exemple de l'eau. Lorsque la capacité 18
est emboítée correctement sur le réservoir 23, le fond 25 de
celui-ci est en contact thermique étroit avec le disque
bimétallique 15. In addition, the capacity 18 (which acts as a simple
fitting end piece) can be fitted to a
Ainsi, tant qu'un liquide circule dans le tube 24, le
réservoir 23 est alimenté en liquide et rempli de celui-ci,
par exemple sous l'action de la gravité. A la fin de la
circulation dudit liquide, ledit réservoir 23 reste plein.
Si une différence de potentiel est appliquée entre les
cosses 4.1 et 4.2, on engendre un courant qui suit un trajet
passant, par la cosse 4.1, le rivet 5.1, la lame 6, la
résistance 20, le disque bimétallique 15, la languette 17 et
la cosse 4.2. La chaleur engendrée par effet Joule par la
résistance 20 est transmise au liquide du réservoir 23, à
travers le disque bimétallique 15 et le fond 25.Thus, as long as a liquid circulates in the
Comme cela a été décrit ci-dessus à propos du mode de
réalisation des figures 1 et 2, le contact électrique entre
les plots 8 et 9 est ouvert après un retard correspondant à
la durée pour évaporer le liquide du réservoir 23, augmentée
de celle nécessaire pour que ledit disque bimétallique 15
repousse suffisamment la résistance 20 (qui remplit donc
l'office de la tige 11), pour que cette résistance 20 ouvre
le contact.As described above regarding the mode of
embodiment of Figures 1 and 2, the electrical contact between
Claims (12)
- Thermal contactor with trip delay, comprising:a fixed contact pad (9);a moving contact pad (8) able to occupy one or other of two positions, for one of the said positions the said moving contact pad (8) bears against the said fixed contact pad (9), establishing electrical contact between the said fixed and moving contact pads, whereas, for the other of the said positions, the said moving contact pad (8) is moved away from the said fixed contact pad (9), opening the electrical contact between the said fixed and moving contact pads;a temperature-sensitive element (15) capable of acting on the said moving contact pad (8) in order to make it change position when the temperature of the said temperature-sensitive element (15) reaches a trip value;an electrical heating element (19, 20) for heating the said temperature-sensitive element (15); anda calibrated reservoir (18, 23) of a liquid, this liquid also being heated by the said electrical heating element (19, 20) and able to evaporate under the action of the heat which is supplied to it by the said heating element (19, 20),
- Thermal contactor according to Claim 1,
characterized in that the said reservoir (18) of evaporable liquid forms an integral part of the said contactor. - Thermal contactor according to Claim 1,
characterized in that the said reservoir (23) of evaporable liquid is attached to the said thermal contactor. - Thermal contactor according to any one of Claims 1 to 4, in which the said fixed and moving contact pads (8, 9) and the said temperature-sensitive element (15) are housed in a casing,
characterized in that the said reservoir (18, 23) of evaporable liquid is in intimate thermal contact with the internal volume of the said casing (1, 2). - Thermal contactor according to Claim 4, in which the said temperature-sensitive element (15) is a bimetallic deformable element,
characterized in that the said bimetallic deformable element (15) at least partially provides the intimate thermal contact between the said liquid reservoir (18, 23) and the internal volume of the said casing (1, 2). - Thermal contactor according to either of Claims 4 and 5,
characterized in that the said electrical heating element (19) is in the said reservoir (18). - Thermal contactor according to either of Claims 4 and 5,
characterized in that the said electrical heating element (20) is in the said casing (1, 2). - Thermal contactor according to one of Claims 1 to 7, in which the said moving contact pad (8) is mounted on the free end of a resilient metal blade (6) and the said temperature-sensitive element (15) acts on the said resilient blade (6) via a sliding rod (11) in order to make the said moving contact pad (8) change position, the ends of the sliding rod (11) bear respectively against the said temperature-sensitive element and against the said resilient blade,
characterized in that the said sliding rod (11) is electrically conducting. - Thermal contactor according to one of Claims 1 to 5 and 7, in which the said moving contact pad (8) is mounted on the free end of a resilient metal blade (6) and the said temperature-sensitive element (15) acts on the said resilient blade (6) via a sliding rod (11) in order to make the said moving contact pad (8) change position, the ends of which sliding rod (11) bear respectively against the said temperature-sensitive element and against the said resilient blade,
characterized in that the said sliding rod is formed by an electrical resistor (20) constituting the said electrical heating element. - Thermal contactor according to any one of Claims 5 to 9,
characterized in that the said casing comprises:a receptacle (1) to which are linked the fixed and moving contact pads (8, 9) as well as three lugs (4.1, 4.2 and 4.3), the said lugs being respectively intended for the supply of power to the fixed contact pad (9), for the common supply of power to the moving contact pad (8) and to one end (21) of the said electrical heating element (20) and for the supply of power to other end (22) of the said electrical heating element; anda cover (2) capable of closing off the said receptacle (1) and designed to house the bimetallic deformable element (15) therein and to be connected to the said liquid reservoir (18, 23). - Thermal contactor according to Claim 10, in combination with either of Claims 8 and 9,
characterized in that the said cover (2) is designed to allow the said sliding rod (11, 20) to slide. - Thermal contactor according to any one of Claims 1 to 11, intended to detect a liquid flowing in a pipe,
characterized in that the said liquid reservoir (23) is in communication of the inside of the said pipe (24) so as to be filled with liquid as long as the latter is flowing in the said pipe.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9501822 | 1995-02-17 | ||
FR9501821A FR2730856B3 (en) | 1995-02-17 | 1995-02-17 | HOLD CONTACTOR THERMAL CONTACTOR |
FR9501822A FR2730857B1 (en) | 1995-02-17 | 1995-02-17 | DELAYED TRIP THERMAL CONTACTOR |
FR9501821 | 1995-02-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0727798A1 EP0727798A1 (en) | 1996-08-21 |
EP0727798B1 true EP0727798B1 (en) | 2000-10-25 |
Family
ID=26231766
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19960400314 Expired - Lifetime EP0727798B1 (en) | 1995-02-17 | 1996-02-15 | Thermal contactor with trip delay |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0727798B1 (en) |
DE (1) | DE69610724T2 (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1159575B (en) * | 1962-05-03 | 1963-12-19 | Siemens Elektrogeraete Gmbh | Cook clock |
GB1330102A (en) * | 1970-01-12 | 1973-09-12 | Toyo Kogyo Co | Thermally operated actuator devices |
US3845440A (en) * | 1973-12-04 | 1974-10-29 | Texas Instruments Inc | Time delay relay |
-
1996
- 1996-02-15 EP EP19960400314 patent/EP0727798B1/en not_active Expired - Lifetime
- 1996-02-15 DE DE1996610724 patent/DE69610724T2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE69610724D1 (en) | 2000-11-30 |
DE69610724T2 (en) | 2001-08-16 |
EP0727798A1 (en) | 1996-08-21 |
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