EP0727798B1 - Connecteur thermique à déclenchement retardé - Google Patents
Connecteur thermique à déclenchement retardé 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
- Authority
- 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
Links
Images
Classifications
-
- 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
-
- 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
- H01H37/02—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
-
- 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.
Landscapes
- Thermally Actuated Switches (AREA)
Description
- 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.
- 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,
- 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.
- 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.
Claims (12)
- Contacteur thermique à déclenchement retardé, comportant :un plot de contact fixe (9) ;un plot de contact mobile (8) pouvant occuper l'une ou l'autre de deux positions, pour l'une desquelles ledit plot de contact mobile (8) est en appui contre ledit plot de contact fixe (9) 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 (8) est écarté dudit plot de contact fixe (9) en ouvrant le contact électrique entre lesdits plots de contact fixe et mobile ;un élément (15) sensible à la température et susceptible d'agir sur ledit plot de contact mobile (8) pour le faire changer de position, lorsque la température dudit élément (15) sensible à la température atteint une valeur de déclenchement ;un élément électrique chauffant (19, 20) pour chauffer ledit élément sensible à la température (15) ; etune réserve calibrée (18, 23) d'un liquide également chauffé par ledit élément électrique chauffant (19, 20) et évaporable sous l'action de la chaleur qui lui est adressée par ledit élément chauffant (19, 20),
- Contacteur thermique selon la revendication 1,
caractérisé en ce que ladite réserve (18) de liquide évaporable fait partie intégrante dudit contacteur. - Contacteur thermique selon la revendication 1,
caractérisé en ce que ladite réserve (23) de liquide évaporable est rapportée audit contacteur thermique. - Contacteur thermique selon l'une quelconque des revendications 1 à 4, dans lequel lesdits plots de contact fixe et mobile (8, 9) et ledit élément sensible à la température (15) sont logés dans un boítier,
caractérisé en ce que ladite réserve (18, 23) de liquide évaporable est en contact thermique étroit avec le volume intérieur dudit boítier (1, 2). - Contacteur thermique selon la revendication 4, dans lequel ledit élément sensible à la température (15) est un élément déformable bimétallique,
caractérisé en ce que ledit élément déformable bimétallique (15) assure au moins partiellement le contact thermique étroit entre ladite réserve de liquide (18, 23) et le volume intérieur dudit boítier (1, 2). - Contacteur thermique selon l'une des revendications 4 ou 5,
caractérisé en ce que ledit élément électrique chauffant (19) se trouve dans ladite réserve (18). - Contacteur thermique selon l'une des revendications 4 ou 5,
caractérisé en ce que ledit élément électrique chauffant (20) se trouve dans ledit boítier (1, 2). - Contacteur thermique selon l'une des revendications 1 à 7, dans lequel ledit plot de contact mobile (8) est monté à l'extrémité libre d'une lame métallique élastique (6) et ledit élément sensible à la température (15) agit sur ladite lame élastique (6) pour faire changer ledit plot de contact mobile (8) de position, par l'intermédiaire d'une tige coulissante (11) dont les extrémités sont respectivement en appui contre ledit élément sensible à la température et contre ladite lame élastique,
caractérisé en ce que ladite tige coulissante (11) est électriquement conductrice. - Contacteur thermique selon l'une des revendications 1 à 5 et 7, dans lequel ledit plot de contact mobile (8) est monté à l'extrémité libre d'une lame métallique élastique (6) et ledit élément sensible à la température (15) agit sur ladite lame élastique (6) pour faire changer ledit plot de contact mobile (8) de position, par l'intermédiaire d'une tige coulissante (11) dont les extrémités sont respectivement en appui contre ledit élément sensible à la température et contre ladite lame élastique,
caractérisé en ce que ladite tige coulissante est formée par une résistance électrique (20) constituant ledit élément électrique chauffant. - Contacteur thermique selon l'une quelconque des revendications 5 à 9,
caractérisé en ce que ledit boítier comporte :un réceptacle (1) auquel sont liés les plots de contact fixe et mobile (8, 9) ainsi que trois cosses (4.1, 4.2 et 4.3), respectivement destinées à l'alimentation du plot de contact fixe (9), à l'alimentation commune du plot de contact mobile (8) et d'une extrémité (21) dudit élément électrique chauffant (20) et à l'alimentation de l'autre extrémité (22) dudit élément électrique chauffant ; etun couvercle (2) susceptible d'obturer ledit réceptacle (1) et aménagé pour y loger l'élément déformable bimétallique (15) et pour être relié à ladite réserve de liquide (18, 23). - Contacteur thermique selon la revendication 10, en combinaison avec l'une quelconque des revendications 8 ou 9,
caractérisé en ce que ledit couvercle (2) est aménagé pour permettre le coulissement de ladite tige coulissante (11, 20). - Contacteur thermique selon l'une quelconque des revendications 1 à 11, destiné à détecter un liquide circulant dans un tube,
caractérisé en ce que ladite réserve de liquide (23) est en communication avec l'intérieur dudit tube (24) de façon à être remplie de liquide tant que celui-ci circule dans ledit tube.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9501821A FR2730856B3 (fr) | 1995-02-17 | 1995-02-17 | Contacteur thermique a resistance de maintien |
FR9501822A FR2730857B1 (fr) | 1995-02-17 | 1995-02-17 | Contacteur thermique a declenchement retarde |
FR9501821 | 1995-02-17 | ||
FR9501822 | 1995-02-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0727798A1 EP0727798A1 (fr) | 1996-08-21 |
EP0727798B1 true EP0727798B1 (fr) | 2000-10-25 |
Family
ID=26231766
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19960400314 Expired - Lifetime EP0727798B1 (fr) | 1995-02-17 | 1996-02-15 | Connecteur thermique à déclenchement retardé |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0727798B1 (fr) |
DE (1) | DE69610724T2 (fr) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1159575B (de) * | 1962-05-03 | 1963-12-19 | Siemens Elektrogeraete Gmbh | Kochuhr |
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/fr not_active Expired - Lifetime
- 1996-02-15 DE DE1996610724 patent/DE69610724T2/de not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE69610724T2 (de) | 2001-08-16 |
EP0727798A1 (fr) | 1996-08-21 |
DE69610724D1 (de) | 2000-11-30 |
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