EP0866482B1 - Thermostat à prix bas et son procédé d'étallonage - Google Patents

Thermostat à prix bas et son procédé d'étallonage Download PDF

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Publication number
EP0866482B1
EP0866482B1 EP19980301923 EP98301923A EP0866482B1 EP 0866482 B1 EP0866482 B1 EP 0866482B1 EP 19980301923 EP19980301923 EP 19980301923 EP 98301923 A EP98301923 A EP 98301923A EP 0866482 B1 EP0866482 B1 EP 0866482B1
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EP
European Patent Office
Prior art keywords
disc
housing
sidewalls
movable contact
movable
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
EP19980301923
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German (de)
English (en)
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EP0866482A1 (fr
Inventor
Jan J. Stiekel
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Texas Instruments Inc
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Texas Instruments Inc
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Publication of EP0866482A1 publication Critical patent/EP0866482A1/fr
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Publication of EP0866482B1 publication Critical patent/EP0866482B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • H01H37/22—Means for adjustment of "on" or "off" operating temperature by adjustment of a member transmitting motion from the thermal element to contacts or latch
    • 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
    • H01H2037/5454—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting with separate spring biasing the bimetal snap element against the heat transfer surface

Definitions

  • This invention relates generally to thermostatic electrical switches and more particularly to such switches which use a snap-acting thermostatic disc to control the state of energization of an electrical circuit.
  • thermostatic switches typically employ an electrically insulating base of plastic, or ceramic for high temperature environments, to mount the components of the switch and provide required electrical isolation therebetween.
  • This base is attached to a heat conductive metallic can for mounting the heat responsive disc in heat conductive relationship with a heat source to be monitored.
  • thermostatic electrical switch which is less expensive to manufacture than prior art thermostats described above.
  • Another object is the provision of a thermostatic electrical switch which is comprised of fewer components than the above noted prior art thermostats and one which is particularly adapted for mass manufacturing techniques.
  • Yet another object of the invention is the provision of a method for calibrating the new low cost thermostatic electrical switch.
  • first and second scoop shaped terminal members are formed from a metal strip and are each provided with opposed sidewalls, one end wall and a bottom wall.
  • the terminal members are provided with flanges which are received on ledges formed on a pair of opposed sidewalls of a thermostatic disc receiving housing with a strip of electrically insulating material disposed between the terminal members and the housing. The distal free ends of the sidewalls are bent over to clamp the flanges through the electrically insulating strip.
  • the terminal members are spaced from one another with the open ends facing one another and a movable contact arm is cantilever mounted on the bottom wall of one terminal member with the free end of the movable contact arm biased into electrical engagement with a stationary contact on the bottom wall of the other terminal member.
  • Tabs are provided on the flange of the terminal members which are bent over to clamp the electrically insulating strip positioning the terminal members a selected distance from one another.
  • a motion transfer member in the form of a ceramic pin is adjustably mounted in an aperture formed in the movable contact arm and extends from the arm down toward a thermostatic snap-acting disc mounted on a disc seat formed on a bottom wall of the disc receiving housing. The disc is movable between opposite dished configurations in dependence upon selected temperature conditions and biases the movable contact arm out of electrical engagement with the stationary electrical contact through the motion transfer member in one of the dished configurations.
  • a spring is mounted in the disc receiving housing and engages the outer marginal portion of the snap-acting disc biasing the disc toward the disc seat to provide consistent thermal response regardless of the orientation of the thermostatic switch.
  • the thermostatic switch made in accordance with the invention is calibrated by first adjusting the position of the motion transfer pin to provide a gap of between 0 and 0.2 mm between the pin and a plane which lies above the disc seat a distance equal to the thickness of the disc.
  • a spring loaded member carried by a punch is moved from a location below the thermostatic switch upwardly in a vertical direction and is brought into engagement with the bottom surface of the housing in alignment with the disc seat and a pin fixedly mounted relative to the spring loaded member is received through an aperture in the bottom wall of the housing lifting the disc off the disc seat.
  • the punch is moved further in the same direction into engagement with an intermediate wall of the housing and with continued movement causes the sidewalls of the housing to deform.
  • the sidewalls are preferably weakened at a selected location by providing one or more slots and further the walls are preferably pre-bent a slight amount, approximately 0.25 mm, to cause the walls to buckle in a predetermined direction, i.e., inwardly. Movement of the punch is terminated as soon as the movable contact arm moves out of electrical engagement with the stationary contact.
  • thermostat 10 comprises a switch portion and a heat sensing portion, the switch portion comprising first and second generally scoop shaped terminal members 12 and 14 respectively, each formed of suitable electrically conductive metal, such as nickel plated steel, and respectively having a bottom wall 12a, 14a, one end wall 12b, 14b, opposed first and second sidewalls 12c, 12d and 14c, 14d extending upwardly from the bottom wall and a flange 12e, 14e extending laterally outwardly from the top portion of the upwardly extending walls.
  • a terminal portion 12f, 14f extends laterally outwardly from the flange at the respective end walls 12b, 14b.
  • the terminals may be conveniently formed from strip by blanking and forming into the scoop shaped configuration and with the terminal portions thickened by bending the strip back onto itself as indicated at 14g in Fig. 6.
  • a strip 16 of suitable electrically insulating material such as NOMEX, a trademark of Dupont de Nemours for aramide paper is wrapped around terminal members 12 and 14.
  • a pair of tabs 12h, 14h extending from respective flanges 12e, 14e adjacent terminal portions 12f, 14f are bent over to clampingly engage strip 16.
  • the width of strip 16, taken in the direction from tabs 12h to tabs 14h, is selected so that terminals 12 and 14 are spaced from one another a predetermined distance 18 shown in Fig. 4.
  • a centrally disposed aperture 16a is formed in strip 16 to allow a motion transfer member, to be discussed below, to pass therethrough.
  • the heat sensing portion includes a thermally conductive disc receiving housing 20, formed of suitable metal such as the nickel plated steel used for terminals 12 and 14, having a bottom wall 20a formed with an annular disc receiving seat 20b and with a cylindrical wall portion 20c extending upwardly therefrom to an intermediate laterally extending wall 20d (see Fig. 6).
  • a thermally conductive disc receiving housing 20 formed of suitable metal such as the nickel plated steel used for terminals 12 and 14, having a bottom wall 20a formed with an annular disc receiving seat 20b and with a cylindrical wall portion 20c extending upwardly therefrom to an intermediate laterally extending wall 20d (see Fig. 6).
  • Opposed first and second sidewalls 20e extend upwardly from intermediate wall 20d to a laterally, outwardly extending ledge 20f.
  • Flanges 12e and 14e of terminals 12 and 14 respectively, along with insulating strip 16 are received on ledges 20f of housing 20 with distal free ends 20g of sidewalls 20e bent over to clampingly engage
  • An aperture 22b is formed through arm 22 at a generally central location intermediate to its fixed and free ends and is formed with a skirt 22c which frictionally engages a ceramic pin 28 which serves as a motion transfer member.
  • Pin 28 is preferably a cylindrical member and can be positioned within skirt 22c and retained there by the frictional engagement of skirt 22c but can be adjusted to a selected longitudinal position by use of a force level greater than that to which the pin will be subjected during operation of the thermostat.
  • Pin 28, mounted in aperture 22b extends downwardly toward bottom wall 20a of disc receiving housing 20 so that it is positioned closely adjacent a disc, to be discussed below, mounted on seat 20b of bottom wall 20a.
  • Opposed sides 22d of arm 22 shown in Fig. 4 or modified 22d' in Fig. 5 are bent out of the plane of the arm in order to stiffen the arm except at a flexible portion adjacent to the cantilever mounted end.
  • Arm 22 is movable toward and away from a stationary electrical contact 26 fixedly mounted on bottom wall 12a of terminal member 12 and is pre-biased toward stationary contact 26.
  • a temperature responsive thermostatic, snap-acting disc 30 is mounted on annular disc seat 20b of the thermally conductive housing 20 and is adapted to move between an upwardly concave dished configuration shown in Figs. 3 and 5 to an oppositely dished, or upwardly convex configuration (not shown) at a selected temperature.
  • thermostat 10 In operation, thermostat 10 is placed in heat transfer relation with a heat source which is to be monitored. At temperatures below a selected level, contacts 24, 26 will be in engagement with one another to thereby complete an electric circuit between terminals 12 and 14. When the temperature of the heat source increases causing the temperature of snap acting disc 30 to increase to the selected level, disc 30 will snap from the configuration shown to its oppositely dished configuration thereby transferring motion through motion transfer member 28 to movable contact arm 22, 22' causing the contacts to move out of engagement and interrupt current flow between the terminals.
  • thermostat 10 is such that it lands itself to mass production techniques.
  • the terminals 12, 14, housing 20, insulating strip 16 and movable contact arm 22, 22' can all be formed automatically from reeled strips and assembled to provide a low cost thermostat.
  • FIG. 7 and 8 A modified embodiment 10' of the thermostatic switch is shown in Figs. 7 and 8 in which a spring member 32 is mounted in disc receiving housing 20 and is adapted to maintain snap-acting disc 30 on disc seat 20b regardless of the orientation of thermostatic switch 10'.
  • Spring member 32 formed of any suitable material having good spring characteristics, has an annular base 32a, generally matching that of disc seat 20b but preferably with a slightly smaller outer diameter, and a pair of upwardly extending spring arms 32b.
  • Spring member 32 is placed over disc 30 with the distal free ends 32c of spring arms 32b engaging the bottom surface of insulating strip 16 to place a force on the outer peripheral portion of disc 30 to urge the disc into engagement with disc seat 20b even when thermostatic switch 10' is in an inverted or skewed orientation. This results in a more constant thermal response.
  • the remainder of the switch except for movable contact arm 22" which is modified so that sides 22d" extend downwardly, are the same as in the Figs. 1-6 embodiment, and need
  • Figs. 5 and 9a-9d With respect to calibration, reference will be had to Figs. 5 and 9a-9d.
  • the position of motion transfer member 28 within aperture 22b and relative to disc seat 20b is such as to provide a gap C d , a calibration distance (see Figs. 5 and 9a) of approximately 0-0.2 mm between member 28 and C c , a calibration level, the equivalent of a flat disc, in another words the distance between member 28 and a plane in which disc seat 20b lies plus the thickness of the disc.
  • a tool in the form of a punch 40 has a first outer member 40a movable back and forth in a linear direction, i.e., vertically up and down as seen in Figs. 9a-9d.
  • Outer member 40a has a first plateau surface 40b having a configuration generally conforming to intermediate wall 20d of housing 20 and formed with a cylindrical cavity 40c.
  • a second, cylindrical, inner member 40d is received in cavity 40c and is movable in the same linear direction.
  • Second member 40d is provided with a radially extending flange 40e which is engageable with a stop surface 40f formed in first member 40a to limit outward movement of second member 40d.
  • Second member 40d is spring biased against stop surface 40f by compression spring 40g which reacts against a base 40h of the punch.
  • a pin 40k is centrally located and fixedly mounted in second member 40d and has a longitudinal axis which extends in a direction parallel with the linear direction of movement of the punch.
  • top portion 40m of pin 40k is precisely located relative to a raised annular surface 40n of the second member for a purpose to be described below.
  • Annular surface 40n is configured to engage an annular portion of the bottom surface of housing 20 aligned with disc seat 20b.
  • punch 40 deforms the sidewalls of housing 20 until disc 30 engages motion transfer pin 28 and causes contacts 24, 26 to separate moving out of electrical engagement to complete the calibration procedure.
  • the distance between a reference level C R , the level at which surface 40b engages can 20 and motion transfer member 28 includes the thickness of the material of housing 20 and disc 30 as well as the calibration distance C d and a certain amount for spring back.
  • sidewalls 20e are preferably weakened, as by forming laterally extending slots 20k, to promote controlled buckling of sidewalls 20e at a selected location of the sidewalls during the calibration procedure. Further, sidewalls can be pre-bent a slight amount, i.e., 0.25 mm as indicated by dashed lines 20m in Fig. 5, to guide the buckling or bending motion in an inward direction.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Thermally Actuated Switches (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Claims (12)

  1. Thermostat comportant
    des premier et second éléments formant bornes électriquement conductrices (12,14) possédant une partie terminale et une partie formant corps, chaque partie formant corps comportant une paroi inférieure (12a,14a), une paroi d'extrémité (12b,14b) et des première et seconde parois latérales opposées (12c,12d et 14c,14d) s'étendant vers le haut à partir de la paroi inférieure jusqu'à une partie supérieure de la paroi d'extrémité et des première et seconde parois latérales et une bride (12e,14e) qui s'étend latéralement vers l'extérieur à partir de la partie supérieure des première et seconde parois latérales de chaque élément formant borne,
    un élément (20) formant boítier de réception d'un disque thermoconducteur, possédant une paroi inférieure (20a) pourvue d'un siège (20b) de réception d'un disque, de forme générale annulaire, des première et seconde parois latérales opposées (20e) s'étendant vers le haut à partir de la paroi inférieure, sur des côtés opposés du siège de réception du disque jusqu'à des première et seconde parties respectives formant rebords (20f), la bride de la première paroi latérale de chaque élément formant borne reçue sur la première partie formant rebord et la bride de la seconde paroi latérale de chaque élément formant borne reçue sur la seconde partie formant rebord étant séparées l'une de l'autre par une bande de matériau électriquement isolant (16) intercalée entre les rebords respectifs et les brides, les première et seconde parois latérales de l'élément formant boítier possédant chacune une partie d'extrémité distale repliée par dessus une bride respective et la bande de matériau électriquement isolant pour fixer à demeure l'élément formant boítier aux éléments formant bornes,
    un disque (30) sensible à la température et déplaçable entre des configurations incurvées opposées l'une à l'autre et disposé sur le siège (20b) de réception du disque;
    un bras de contact mobile (22) possédant des première et seconde parties opposées, une partie d'extrémité du bras de contact mobile étant montée en porte-à-faux sur la paroi inférieure (14a) d'un élément formant borne, l'autre extrémité du contact mobile pouvant être amenée en contact électrique avec la paroi inférieure de l'autre élément formant borne et en être écartée, et étant sollicitée de manière à être en contact avec cet élément, et un élément de transfert de déplacement (28) qui s'étend depuis le bras de contact mobile en direction du disque sensible à la température, le disque sensible à la température transférant le déplacement au bras de contact mobile par l'intermédiaire de l'élément de transfert de déplacement de manière à solliciter le bras mobile en l'écartant de l'autre élément formant borne lorsque le disque sensible à la température se déplace en direction de l'une des configurations incurvées.
  2. Thermostat selon la revendication 1, dans lequel la bride s'étend latéralement vers l'extérieur à partir de la partie supérieure de la paroi d'extrémité, la partie terminale de chaque élément formant borne respectif s'étend latéralement vers l'extérieur à partir de la bride au niveau de la paroi d'extrémité respective, et les éléments formant bornes possèdent des languettes qui s'étendent depuis la bride au niveau de chaque paroi d'extrémité repliée de manière à s'appliquer contre la bande de matériau électriquement isolant.
  3. Thermostat selon la revendication 1 ou la revendication 2, dans lequel le bras de contact mobile est pourvu d'une ouverture (22b), qui le traverse, entre ses première et seconde parties d'extrémité, et l'élément de transfert de déplacement (28) est une broche électriquement isolante reçue à travers l'ouverture de manière à engrener par frottement avec le bras de contact mobile.
  4. Thermostat selon la revendication 3, dans lequel l'ouverture possède une partie en forme de jupe (22c) qui s'étend à partir de cette ouverture de manière à coopérer par frottement avec les broches électriquement isolantes.
  5. Thermostat selon la revendication 3, dans lequel la broche électriquement isolante est constituée d'un matériau céramique.
  6. Thermostat selon la revendication 1 ou la revendication 2, dans lequel la bande de matériau électriquement isolant est formée de NOMEX.
  7. Thermostat selon la revendication 1 ou la revendication 2, dans lequel la paroi inférieure de l'élément de logement recevant le disque thermoconducteur est une paroi d'extrémité d'une section cylindrique qui s'étend vers le haut sur une distance sélectionnée, jusqu'à un emplacement, dans lequel les parois latérales sont formées, chaque paroi latérale étant formée d'une section affaiblie destinée à entraíner une déformation des parois latérales pendant l'étalonnage, en un emplacement sélectionné.
  8. Thermostat selon la revendication 7, dans lequel la section affaiblie est formée d'au moins une fente située dans chaque paroi latérale.
  9. Thermostat selon la revendication 1 ou la revendication 2, dans lequel une ouverture est formée dans la paroi inférieure de l'élément de boítier recevant le disque thermoconducteur, pour faciliter l'étalonnage du thermostat.
  10. Thermostat selon la revendication 1 ou la revendication 2, comprenant en outre un élément de ressort monté dans l'élément de boítier thermoconducteur, l'élément de ressort appliquant une force au disque thermoconducteur en direction du siège de réception du disque.
  11. Procédé d'étalonnage d'un interrupteur électrique thermostatique sensible à la température comportant une partie de commutation et une partie de détection de chaleur, la partie de détection de chaleur possédant un disque (30) à action brusque disposé sur un siège (20b) du disque, que comporte un boítier, et étant déplaçable entre des configurations en forme de coupelles opposées en réponse à des conditions de température sélectionnées, le siège du disque étant couplé à la partie de commutation par l'intermédiaire d'un couple de parois latérales opposées, la partie de commutation possédant un bras de contact mobile (22) normalement sollicité de manière à être en contact électrique avec un contact fixe, et un élément de déplacement (28) qui s'étend depuis le bras de contact mobile en direction de la partie supérieure du disque sensible à la température, comprenant les étapes consistant à
    régler la position de l'élément de transfert de déplacement par rapport au bras de contact mobile de manière à produire un interstice sélectionné entre l'élément de transfert de déplacement et un plan parallèle au et espacé du siège de disque, d'une quantité égale à l'épaisseur du disque,
    prévoir un premier élément mobile en va-et-vient dans une direction linéaire, le premier élément possédant une surface adaptée pour s'appliquer sur le boítier sur les côtés opposés du siège de disque, un second élément chargé par un ressort et monté sur le premier élément et déplaçable avec le premier élément et déplaçable dans la direction linéaire par rapport au premier élément, le second élément possédant une surface adaptée pour s'appliquer contre la surface inférieure du boítier aligné avec le siège du disque, le second élément possédant une broche montée de façon fixe par rapport au second élément, la broche étant disposée d'une manière centrée dans l'élément intérieur et possédant un axe longitudinal qui s'étend parallèlement à la direction linéaire,
    déplacer les premier et second éléments de telle sorte que le second élément fasse coopérer le boítier avec moyen de la broche qui traverse une ouverture formée dans le boítier, soulever le disque au-dessus du siège du disque tout en laissant le premier élément espacé du boítier,
    déplacer le premier élément de telle sorte que la surface de ce premier élément s'applique contre le boítier,
    continuer à déplacer le premier élément à l'encontre de la sollicitation du ressort de manière à amener les parois latérales à se déformer jusqu'à ce que le bras de contact mobile se déplace hors de contact électrique avec le contact fixe.
  12. Procédé selon la revendication 11, selon lequel l'interstice sélectionné est compris entre environ 0 et 0,2 mm.
EP19980301923 1997-03-18 1998-03-13 Thermostat à prix bas et son procédé d'étallonage Expired - Lifetime EP0866482B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US4082197P 1997-03-18 1997-03-18
US40821P 1997-03-18

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Publication Number Publication Date
EP0866482A1 EP0866482A1 (fr) 1998-09-23
EP0866482B1 true EP0866482B1 (fr) 2000-07-26

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EP (1) EP0866482B1 (fr)
JP (1) JPH10294048A (fr)
DE (1) DE69800228T2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6995647B2 (en) 2003-12-03 2006-02-07 Texas Instruments Incorporated Low current electric motor protector
US7102481B2 (en) * 2003-12-03 2006-09-05 Sensata Technologies, Inc. Low current electric motor protector

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4622739A (en) * 1983-12-27 1986-11-18 Texas Instruments Incorporated Method of providing an improved seal for thermostatic switch housings
AT394914B (de) * 1990-10-25 1992-07-27 Electrovac Thermischer schalter
US5402099A (en) * 1993-12-14 1995-03-28 Ballard; Edwin C. High temperature, temperature responsive snap acting control member and electrical switches using such members

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Publication number Publication date
EP0866482A1 (fr) 1998-09-23
DE69800228D1 (de) 2000-08-31
JPH10294048A (ja) 1998-11-04
DE69800228T2 (de) 2001-01-04

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