EP0485310A1 - Pressure switch for the thermal safety of a washing machine or similar apparatus - Google Patents

Pressure switch for the thermal safety of a washing machine or similar apparatus Download PDF

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Publication number
EP0485310A1
EP0485310A1 EP91420390A EP91420390A EP0485310A1 EP 0485310 A1 EP0485310 A1 EP 0485310A1 EP 91420390 A EP91420390 A EP 91420390A EP 91420390 A EP91420390 A EP 91420390A EP 0485310 A1 EP0485310 A1 EP 0485310A1
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EP
European Patent Office
Prior art keywords
pressure
pressure switch
washing machine
chamber
sensitive
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.)
Withdrawn
Application number
EP91420390A
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German (de)
French (fr)
Inventor
Michel Daulhac
John Riley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BorgWarner Transmission Systems Monaco SAM
Original Assignee
Eaton SAM
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eaton SAM filed Critical Eaton SAM
Publication of EP0485310A1 publication Critical patent/EP0485310A1/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/26—Details
    • H01H35/30—Means for transmitting pressure to pressure-responsive operating part, e.g. by capsule and capillary tube
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H2009/0083—Details of switching devices, not covered by groups H01H1/00 - H01H7/00 using redundant components, e.g. two pressure tubes for pressure switch

Definitions

  • the present invention relates to a pressure switch, that is to say a thermal safety device comprising an internal chamber with a member, such as a membrane, sensitive to pressure and acting on at least one electrical contact, the chamber being suitable to be connected to an external volume whose pressure to be controlled is transmitted to said chamber.
  • the sensitive organ such as the membrane deforms or moves under the influence of pressure variations, and it opens or closes electrical contacts, inserted in appropriate protection circuits, as soon as a limit pressure is reached.
  • a pressure switch of this kind can be used as a safety device, for example in a washing machine, in which case the pressure switch is connected to a compression chamber, itself connected to the tank of the washing machine.
  • the contacts of the pressure switch thus complete the thermal protection of the washing machine, and they may be mandatory for compliance with safety regulations.
  • the pressure to be controlled is transmitted to such a pressure switch by a single pipe. If this single pipe is blocked or pinched, the pressure switch can no longer perform its safety function. It is possible to avoid this drawback by doubling the entire safety system, that is to say by providing two pressure switches or a double-body pressure switch, as well as two respective connection pipes, and possibly. Two separate volumes from which these two pipes leave. This solution is heavy, expensive and cumbersome.
  • the present invention aims to eliminate these drawbacks by providing a technical solution which avoids the use of a second pressure switch and a second compression chamber in the washing machine or other device to be controlled, while considerably limiting the risks resulting plugging or pinching a pressure transmission pipe.
  • the invention relates to a pressure switch of the kind specified in the introduction, which comprises at least two connections provided for respective connecting pipes mounted montin parallel ⁇ between the external volume, the pressure of which is to be controlled, and the internal chamber with pressure sensitive organ.
  • the internal chamber considered of the pressure switch can in particular be delimited, in a known manner, by a housing cover and by a membrane constituting the pressure-sensitive member; in this case, according to one embodiment of the invention, the housing cover has two connection end pieces for the respective ends of the two pipes, the other ends of which are connected to the external volume whose pressure is to be checked.
  • the external volume to which the two pipes are connected is a single compression chamber, itself connected to the tank of the machine to wash.
  • FIG. 1 is a sectional view of a pressure switch according to the present invention, applied to a washing machine or other similar household appliance.
  • the pressure switch proper generally designated by the reference 1
  • a compression chamber 2 itself placed in communication via a tubular connection 3 with the tank 4 of the washing machine, for which a control is required.
  • the pressure switch 1 comprises a support housing 5, closed by a cover 6.
  • a membrane 7 has its periphery clamped between the support housing 5 and the cover 6, while its central part rests on a movable disc thrust 8 subjected to the action of a spring 9 for adjusting the engagement pressure.
  • the force of the spring 9 is itself adjusted by means of a screw 10.
  • a bi-stable mobile mechanical assembly 11 Inside the support box 5 is mounted a bi-stable mobile mechanical assembly 11, connected to a fixed terminal 12 and carrying an electrical contact 13 which can be multiple; the movable contact 13 cooperates with at least one fixed electrical contact 14 normally closed and one fixed electrical contact 15 normally open, an adjustment screw 16 making it possible to act on the position of this last contact 15 to adjust the reset pressure.
  • a stop 17 provides security in the event of sticking between the contacts 13 and 15.
  • the pressure switch 1 is connected to the compression chamber 2 by two pipes 18 and 19.
  • the first pipe 18 is connected, at one end, to a first end piece 20 of the cover 6 of the pressure switch 1 and, at its other end, to a first nozzle 21 of the compression chamber 2.
  • the second pipe 19 is connected, at one end, to a second nozzle 22 of the cover 6 of the pressure switch 1 and, by its other end, to a second nozzle 23 of the compression chamber 2.
  • the two pipes 18 and 19 are connected ⁇ in parallel ⁇ and normally transmit one and the other, to the pressure switch 1, the pressure which prevails inside the compression chamber 2.
  • This pressure is brought into the chamber 24 delimited by the cover 6 and by the membrane 7, and it acts beyond a certain threshold, via the thrust disc 8, on the bi-stable mobile assembly 11, to modify the state of contacts 13, 14 and 15.
  • the other pipe If one of the two pipes 18 and 19 is accidentally blocked or pinched, the other pipe always ensures the transmission of the pressure from the chamber 2 to the pressure switch 1, and the latter still performs its safety function, reacting to any dangerous rise in pressure, in particular to provide thermal protection.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)

Abstract

The pressure switch includes an internal chamber (24) with a member such as a membrane (7), sensitive to pressure and acting on electrical contacts (13, 14, 15). The chamber (24) includes two connectors (20, 22), provided for connection thereof to an outer volume (2), the pressure of which is to be monitored, by two respective hoses (18, 19) mounted "in parallel". The safety function is thus improved. Particular application: thermal protection for a washing machine. <IMAGE>

Description

La présente invention concerne un pressostat, c'est-à-dire un dispositif de sécurité thermique comportant une chambre interne avec un organe, tel qu'une membrane, sensible à la pression et agissant sur au moins un contact électrique, la chambre étant apte à être reliée à un volume extérieur dont la pression à contrôler est transmise à ladite chambre. L'organe sensible tel que membrane se déforme ou se déplace sous l'influence des variations de pression, et il ouvre ou ferme des contacts électriques, insérés dans des circuits de protection appropriés, dès qu'une pression limite est atteinte.The present invention relates to a pressure switch, that is to say a thermal safety device comprising an internal chamber with a member, such as a membrane, sensitive to pressure and acting on at least one electrical contact, the chamber being suitable to be connected to an external volume whose pressure to be controlled is transmitted to said chamber. The sensitive organ such as the membrane deforms or moves under the influence of pressure variations, and it opens or closes electrical contacts, inserted in appropriate protection circuits, as soon as a limit pressure is reached.

Un pressostat de ce genre est utilisable comme dispositif de sécurité, par exemple dans une machine à laver le linge, auquel cas le pressostat est relié à une chambre de compression, elle-même raccordée à la cuve de la machine à laver. Les contacts du pressostat complètent ainsi la protection thermique de la machine à laver, et ils peuvent être obligatoires pour le respect des prescriptions de sécurité.A pressure switch of this kind can be used as a safety device, for example in a washing machine, in which case the pressure switch is connected to a compression chamber, itself connected to the tank of the washing machine. The contacts of the pressure switch thus complete the thermal protection of the washing machine, and they may be mandatory for compliance with safety regulations.

Habituellement, la pression à contrôler est transmise vers un tel pressostat par un seul tuyau. Si ce tuyau unique est obturé ou pincé, le pressostat ne peut plus assurer sa fonction de sécurité. Il est possible d'éviter cet inconvénient en doublant tout le système de sécurité, c'est-à-dire en prévoyant deux pressostats ou un pressostat à double corps, ainsi que deux tuyaux de raccordement respectifs, et éventuellement . Deux volumes distincts d'où partent ces deux tuyaux. Cette solution est lourde, coûteuse et encombrante.Usually, the pressure to be controlled is transmitted to such a pressure switch by a single pipe. If this single pipe is blocked or pinched, the pressure switch can no longer perform its safety function. It is possible to avoid this drawback by doubling the entire safety system, that is to say by providing two pressure switches or a double-body pressure switch, as well as two respective connection pipes, and possibly. Two separate volumes from which these two pipes leave. This solution is heavy, expensive and cumbersome.

La présente invention vise à éliminer ces inconvénients, en fournissant une solution technique qui évite l'utilisation d'un deuxième pressostat et d'une deuxième chambre de compression dans la machine à laver ou autre appareil à contrôler, tout en limitant considérablement les risques résultant d'une obturation ou d'un pincement d'un tuyau de transmission de la pression.The present invention aims to eliminate these drawbacks by providing a technical solution which avoids the use of a second pressure switch and a second compression chamber in the washing machine or other device to be controlled, while considerably limiting the risks resulting plugging or pinching a pressure transmission pipe.

A cet effet, l'invention a pour objet un pressostat du genre précisé en introduction, qui comporte au moins deux raccordements prévus pour des tuyaux de liaison respectifs montés ˝en parallèle˝ entre le volume extérieur, dont la pression est à contrôler, et la chambre interne avec organe sensible à la pression.To this end, the invention relates to a pressure switch of the kind specified in the introduction, which comprises at least two connections provided for respective connecting pipes mounted montin parallel˝ between the external volume, the pressure of which is to be controlled, and the internal chamber with pressure sensitive organ.

Ainsi, en cas d'obturation ou de pincement de l'un des tuyaux, il reste encore pratiquement certain que l'autre tuyau puisse transmettre convenablement la pression vers la chambre précitée, de sorte que le pressostat reste en mesure d'assurer sa fonction de sécurité.Thus, in the event of one of the pipes being blocked or pinched, it remains practically certain that the other pipe can properly transmit the pressure to the aforementioned chamber, so that the pressure switch remains able to perform its function. of security.

La chambre interne considérée du pressostat peut notamment être délimitée, de façon connue, par un couvercle de boîtier et par une membrane constituant l'organe sensible à la pression ; dans ce cas, selon une forme de réalisation de l'invention, le couvercle de boîtier comporte deux embouts de raccordement pour les extrémités respectives des deux tuyaux dont les autres extrémités sont raccordées au volume extérieur dont la pression est à contrôler.The internal chamber considered of the pressure switch can in particular be delimited, in a known manner, by a housing cover and by a membrane constituting the pressure-sensitive member; in this case, according to one embodiment of the invention, the housing cover has two connection end pieces for the respective ends of the two pipes, the other ends of which are connected to the external volume whose pressure is to be checked.

Dans le cas de l'application de l'invention à la protection thermique d'une machine à laver le linge, le volume extérieur auquel se raccordent les deux tuyaux est une chambre de compression unique, elle-même raccordée à la cuve de la machine à laver.In the case of the application of the invention to the thermal protection of a washing machine, the external volume to which the two pipes are connected is a single compression chamber, itself connected to the tank of the machine to wash.

De toute façon, l'invention sera mieux comprise à l'aide de la description qui suit, en référence à l'unique figure du dessin schématique annexé représentant, à titre d'exemple non limitatif, une forme d'exécution de ce pressostat.In any case, the invention will be better understood with the aid of the description which follows, with reference to the single figure of the appended diagrammatic drawing representing, by way of nonlimiting example, an embodiment of this pressure switch.

Cette figure est une vue en coupe d'un pressostat conforme à la présente invention, appliqué à une machine à laver le linge ou autre appareil électro-ménager analogue. Le pressostat proprement dit, désigné globalement par le repère 1, est relié à une chambre de compression 2, elle-même mise en communication par l'intermédiaire d'un raccord tubulaire 3 avec la cuve 4 de la machine à laver, pour laquelle un contrôle est nécessaire.This figure is a sectional view of a pressure switch according to the present invention, applied to a washing machine or other similar household appliance. The pressure switch proper, generally designated by the reference 1, is connected to a compression chamber 2, itself placed in communication via a tubular connection 3 with the tank 4 of the washing machine, for which a control is required.

De manière connue, le pressostat 1 comporte un boîtier-support 5, fermé par un couvercle 6. Une membrane 7 a sa périphérie serrée entre le boîtier-support 5 et le couvercle 6, tandis que sa partie centrale s'appuie sur un disque mobile de poussée 8 soumis à l'action d'un ressort 9 de réglage de la pression d'enclenchement. La force du ressort 9 est elle-même réglée au moyen d'une vis 10. A l'intérieur du boîtier-support 5 est monté un ensemble mécanique mobile bi-stable 11, relié à une borne fixe 12 et portant un contact électrique 13 qui peut être multiple ; le contact mobile 13 coopère avec au moins un contact électrique fixe 14 normalement fermé et un contact électrique fixe 15 normalement ouvert, une vis de réglage 16 permettant d'agir sur la position de ce dernier contact 15 pour régler la pression de réenclenchement. Enfin, une butée 17 assure une sécurité en cas de collage entre les contacts 13 et 15.In known manner, the pressure switch 1 comprises a support housing 5, closed by a cover 6. A membrane 7 has its periphery clamped between the support housing 5 and the cover 6, while its central part rests on a movable disc thrust 8 subjected to the action of a spring 9 for adjusting the engagement pressure. The force of the spring 9 is itself adjusted by means of a screw 10. Inside the support box 5 is mounted a bi-stable mobile mechanical assembly 11, connected to a fixed terminal 12 and carrying an electrical contact 13 which can be multiple; the movable contact 13 cooperates with at least one fixed electrical contact 14 normally closed and one fixed electrical contact 15 normally open, an adjustment screw 16 making it possible to act on the position of this last contact 15 to adjust the reset pressure. Finally, a stop 17 provides security in the event of sticking between the contacts 13 and 15.

Le pressostat 1 est relié à la chambre de compression 2 par deux tuyaux 18 et 19. Le premier tuyau 18 est raccordé, par une extrémité, à un premier embout 20 du couvercle 6 du pressostat 1 et, par son autre extrémité, à un premier embout 21 de la chambre de compression 2. Le second tuyau 19 est raccordé, par une extrémité, à un second embout 22 du couvercle 6 du pressostat 1 et, par son autre extrémité, à un second embout 23 de la chambre de compression 2.The pressure switch 1 is connected to the compression chamber 2 by two pipes 18 and 19. The first pipe 18 is connected, at one end, to a first end piece 20 of the cover 6 of the pressure switch 1 and, at its other end, to a first nozzle 21 of the compression chamber 2. The second pipe 19 is connected, at one end, to a second nozzle 22 of the cover 6 of the pressure switch 1 and, by its other end, to a second nozzle 23 of the compression chamber 2.

Ainsi, les deux tuyaux 18 et 19 sont branchés ˝en parallèle˝ et transmettent normalement l'un et l'autre, vers le pressostat 1, la pression qui règne à l'intérieur de la chambre de compression 2. Cette pression est amenée dans la chambre 24 délimitée par le couvercle 6 et par la membrane 7, et elle agit au-delà d'un certain seuil, par l'intermédiaire du disque de poussée 8, sur l'ensemble mobile bi-stable 11, pour modifier l'état des contacts 13, 14 et 15.Thus, the two pipes 18 and 19 are connected ˝in parallel˝ and normally transmit one and the other, to the pressure switch 1, the pressure which prevails inside the compression chamber 2. This pressure is brought into the chamber 24 delimited by the cover 6 and by the membrane 7, and it acts beyond a certain threshold, via the thrust disc 8, on the bi-stable mobile assembly 11, to modify the state of contacts 13, 14 and 15.

Si l'un des deux tuyaux 18 et 19 est accidentellement obturé ou pincé, l'autre tuyau assure toujours la transmission de la pression depuis la chambre 2 vers le pressostat 1, et ce dernier assure encore sa fonction de sécurité, en réagissant à toute élévation dangereuse de la pression, notamment en vue d'assurer une protection thermique.If one of the two pipes 18 and 19 is accidentally blocked or pinched, the other pipe always ensures the transmission of the pressure from the chamber 2 to the pressure switch 1, and the latter still performs its safety function, reacting to any dangerous rise in pressure, in particular to provide thermal protection.

Comme il va de soi, l'invention ne se limite pas à la seule forme d'exécution de ce pressostat qui a été décrite ci-dessus, à titre d'exemple ; elle en embrasse, au contraire, toutes les variantes de réalisation et d'application respectant le même principe. C'est ainsi, notamment, que l'on ne s'éloignerait pas du cadre de la présente invention en modifiant des détails constructifs du pressostat, tels que la disposition ou le nombre des contacts électriques, ou en destinant ce pressostat à une utilisation autre que la sécurité d'une machine à laver.It goes without saying that the invention is not limited to the sole embodiment of this pressure switch which has been described above, by way of example; on the contrary, it embraces all of the variant embodiments and applications respecting the same principle. Thus, in particular, that one would not depart from the scope of the present invention by modifying constructive details of the pressure switch, such as the arrangement or the number of the electrical contacts, or by destining this pressure switch for other use. as the safety of a washing machine.

Claims (3)

Pressostat comportant une chambre interne (24) avec un organe (7) sensible à la pression et agissant sur au moins un contact électrique (13,14,15), la chambre (24) étant apte à être reliée à un volume extérieur (2) dont la pression à contrôler est transmise à ladite chambre, caractérisé en ce qu'il comporte au moins deux raccordements (20,22) prévus pour des tuyaux de liaison respectifs (18,19) montés ˝en parallèle˝ entre le volume extérieur (2) dont la pression est à contrôler et la chambre interne (24) avec organe (7) sensible à la pression.Pressure switch comprising an internal chamber (24) with a member (7) sensitive to pressure and acting on at least one electrical contact (13,14,15), the chamber (24) being able to be connected to an external volume (2 ) whose pressure to be checked is transmitted to said chamber, characterized in that it comprises at least two connections (20,22) provided for respective connecting pipes (18,19) mounted ˝in parallel˝ between the external volume ( 2) whose pressure is to be controlled and the internal chamber (24) with member (7) sensitive to the pressure. Pressostat selon la revendication 1, dans lequel ladite chambre interne (24) est délimitée par un couvercle de boîtier (6) et par une membrane (7) constituant l'organe sensible à la pression, caractérisé en ce que le couvercle de boîtier (6) comporte deux embouts de raccordement (20,22) pour les extrémités respectives de deux tuyaux (18,19) dont les autres extrémités sont raccordées au volume extérieur (2) dont la pression est à contrôler.Pressure switch according to claim 1, in which said internal chamber (24) is delimited by a housing cover (6) and by a membrane (7) constituting the pressure-sensitive member, characterized in that the housing cover (6 ) has two connection ends (20,22) for the respective ends of two pipes (18,19), the other ends of which are connected to the external volume (2) whose pressure is to be checked. Pressostat selon la revendication 1 ou 2, caractérisé par son application à la protection thermique d'une machine à laver le linge, ledit volume extérieur (2) étant une chambre de compression elle-même raccordée (en 3) à la cuve (4) de la machine à laver.Pressure switch according to claim 1 or 2, characterized by its application to the thermal protection of a washing machine, said external volume (2) being a compression chamber itself connected (at 3) to the tank (4) of the washing machine.
EP91420390A 1990-11-06 1991-11-04 Pressure switch for the thermal safety of a washing machine or similar apparatus Withdrawn EP0485310A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9014093A FR2668852B1 (en) 1990-11-06 1990-11-06 PRESSURE SWITCH FOR THE THERMAL SAFETY OF A WASHING MACHINE OR THE LIKE.
FR9014093 1990-11-06

Publications (1)

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EP0485310A1 true EP0485310A1 (en) 1992-05-13

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EP91420390A Withdrawn EP0485310A1 (en) 1990-11-06 1991-11-04 Pressure switch for the thermal safety of a washing machine or similar apparatus

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EP (1) EP0485310A1 (en)
FR (1) FR2668852B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0512937A1 (en) * 1991-05-07 1992-11-11 Fagor, S.Coop. Ltda. Improvements to pressurestats
DE4337778C1 (en) * 1993-11-05 1995-01-26 Honeywell Bv Device for the connection of a gas pressure switch

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1214302B (en) * 1963-07-25 1966-04-14 Bosch Gmbh Robert Electric membrane pressure switch
FR2241133A1 (en) * 1973-08-13 1975-03-14 Copreci Ind Sci
FR2394167A1 (en) * 1977-06-10 1979-01-05 Bosch Siemens Hausgeraete Pushbutton switch with box shaped housing - has latter divided into two chambers and has dish shaped plate attached to diaphragm sealing top of chambers

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1214302B (en) * 1963-07-25 1966-04-14 Bosch Gmbh Robert Electric membrane pressure switch
FR2241133A1 (en) * 1973-08-13 1975-03-14 Copreci Ind Sci
FR2394167A1 (en) * 1977-06-10 1979-01-05 Bosch Siemens Hausgeraete Pushbutton switch with box shaped housing - has latter divided into two chambers and has dish shaped plate attached to diaphragm sealing top of chambers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0512937A1 (en) * 1991-05-07 1992-11-11 Fagor, S.Coop. Ltda. Improvements to pressurestats
DE4337778C1 (en) * 1993-11-05 1995-01-26 Honeywell Bv Device for the connection of a gas pressure switch

Also Published As

Publication number Publication date
FR2668852A1 (en) 1992-05-07
FR2668852B1 (en) 1994-05-13

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