EP0485310A1 - Druckschalter für die thermische Sicherheit einer Waschmaschine oder ähnlichem Gerät - Google Patents

Druckschalter für die thermische Sicherheit einer Waschmaschine oder ähnlichem Gerät 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
Authority
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Withdrawn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
Other languages
English (en)
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/de
Withdrawn legal-status Critical Current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)
EP91420390A 1990-11-06 1991-11-04 Druckschalter für die thermische Sicherheit einer Waschmaschine oder ähnlichem Gerät Withdrawn EP0485310A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9014093 1990-11-06
FR9014093A FR2668852B1 (fr) 1990-11-06 1990-11-06 Pressostat pour la securite thermique d'une machine a laver ou appareil analogue.

Publications (1)

Publication Number Publication Date
EP0485310A1 true EP0485310A1 (de) 1992-05-13

Family

ID=9402140

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91420390A Withdrawn EP0485310A1 (de) 1990-11-06 1991-11-04 Druckschalter für die thermische Sicherheit einer Waschmaschine oder ähnlichem Gerät

Country Status (2)

Country Link
EP (1) EP0485310A1 (de)
FR (1) FR2668852B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0512937A1 (de) * 1991-05-07 1992-11-11 Fagor, S.Coop. Ltda. Verbesserungen an Druckschaltern
DE4337778C1 (de) * 1993-11-05 1995-01-26 Honeywell Bv Vorrichtung zum Anschließen eines Gasdruckschalters

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1214302B (de) * 1963-07-25 1966-04-14 Bosch Gmbh Robert Elektrischer Membrandruckschalter
FR2241133A1 (de) * 1973-08-13 1975-03-14 Copreci Ind Sci
FR2394167A1 (fr) * 1977-06-10 1979-01-05 Bosch Siemens Hausgeraete Manostat pour appareils menagers fonctionnant a l'eau, en particulier pour lave-vaisselle ou machines a laver

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1214302B (de) * 1963-07-25 1966-04-14 Bosch Gmbh Robert Elektrischer Membrandruckschalter
FR2241133A1 (de) * 1973-08-13 1975-03-14 Copreci Ind Sci
FR2394167A1 (fr) * 1977-06-10 1979-01-05 Bosch Siemens Hausgeraete Manostat pour appareils menagers fonctionnant a l'eau, en particulier pour lave-vaisselle ou machines a laver

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0512937A1 (de) * 1991-05-07 1992-11-11 Fagor, S.Coop. Ltda. Verbesserungen an Druckschaltern
DE4337778C1 (de) * 1993-11-05 1995-01-26 Honeywell Bv Vorrichtung zum Anschließen eines Gasdruckschalters

Also Published As

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

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