EP0076727B1 - Interrupteur électrique thermostatique et réfrigérateur à dégivrage semi-automatique muni d'un tel interrupteur - Google Patents

Interrupteur électrique thermostatique et réfrigérateur à dégivrage semi-automatique muni d'un tel interrupteur Download PDF

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Publication number
EP0076727B1
EP0076727B1 EP82401731A EP82401731A EP0076727B1 EP 0076727 B1 EP0076727 B1 EP 0076727B1 EP 82401731 A EP82401731 A EP 82401731A EP 82401731 A EP82401731 A EP 82401731A EP 0076727 B1 EP0076727 B1 EP 0076727B1
Authority
EP
European Patent Office
Prior art keywords
lever
interrupter
switch
thermostatic
bellows
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
Application number
EP82401731A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0076727A1 (fr
Inventor
Yves Malbec
Yves Boisot
Daniel Bontemps
Georges Duhamel
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.)
Electromecanique du Nivernais Selni Ste
Original Assignee
Electromecanique du Nivernais Selni Ste
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 Electromecanique du Nivernais Selni Ste filed Critical Electromecanique du Nivernais Selni Ste
Priority to AT82401731T priority Critical patent/ATE18828T1/de
Publication of EP0076727A1 publication Critical patent/EP0076727A1/fr
Application granted granted Critical
Publication of EP0076727B1 publication Critical patent/EP0076727B1/fr
Expired 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
    • 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
    • H01H35/2607—Means for adjustment of "ON" or "OFF" operating pressure

Definitions

  • the present invention relates to a thermostatic electric switch intended to equip a refrigerating enclosure with semi-automatic defrosting.
  • the switch In thermostats of known type, the switch generally makes it possible to regulate the temperature of a refrigeration chamber by limiting, between two values T l and T 2 prefixed, the temperature of the evaporator of the cold producing device. .
  • These two values T i , T 2 can be slightly modified by the user of the refrigeration cabinet by turning, in the desired direction, an adjustment knob, the difference T between the two chosen values remain fixed.
  • defrosting can be obtained if, for a chosen position of the adjustment handle, at least one of these temperatures T i , T 2 is greater than 0 ° C. To do this, you must manually turn the knob to the defrost position. It will then be necessary to return it to its initial position when the defrosting operation is completed.
  • Patent DE-B-1 147245 the depressing of a push button in the thermostat adjustment button lengthens the return spring of the operating lever.
  • the movement of the pusher is regulated by a slide and a ball installed in the thickness of the shaft of the adjustment knob.
  • the switch which is the subject of the invention makes it possible, by a single action on a control button, to bring the starting temperature of the putting into service of the motor-compressor of a refrigeration appliance to a value greater than 0 ° C. (defrost temperature) during a single operating cycle, the length of this cycle being a function of the average temperature chosen for the operation of the refrigeration unit.
  • the device returns to normal operation and the control button is reset automatically.
  • the invention relates to a thermostatic switch comprising a bellows containing an expandable fluid and provided with a tight tube forming a thermal probe, a first lever being able to pivot around a first fixed axis and intended to cooperate with the bellows to control the operation of the switch ; means making it possible to apply a force to the first lever intended to pivot it around said first axis and to temporarily maintain it in a position corresponding to the open position of the switch, returning to its initial position, which corresponds to the closed position of the switch, effected by the effect of the bellows thrust when it reaches a predetermined value; a second lever which can pivot around a second fixed axis, said second lever being intended to come to press temporarily on the first lever so as to pivot this lever around the first axis and thus control the opening of the switch; and means making it possible to apply, to the second lever, a determined value force making it possible to temporarily maintain the second lever in contact with the first lever, is characterized in that the second lever is provided with an element intended to come
  • a switch 1 of known type, used in the supply circuit of compressor refrigerators for example, comprises, as shown in FIG. 1, a fixed contact C, and a movable contact C 2 .
  • This switch 1 further comprises a bellows 2 provided with a leaktight tube 13 constituting a thermal probe, this bellows 2, which contains an expandable fluid, having a volume which varies as a function of the temperature of the refrigeration chamber.
  • a lever 3 movable about an axis 0, fixed and having, at one of its ends, a stirrup comprising a metal tab 7 solid Daire of the lever 3 and fixed to a return spring 4 whose tension is adjustable by means of a screw 5, and a finger 14 of insulating material intended to actuate in a known manner the movable contact C 2 of the switch 1.
  • a handle 90 for adjusting the temperature is fixed to a shaft 9 of a cam 8 associated with a cam follower 6 provided with a follower lug 15.
  • the thermostat shown in Figure 1 is shown in the tripped position (contacts C l , C 2 open).
  • the thermostat in this triggered position prohibits the production of cold in the refrigerating chamber.
  • the temperature then rises in the enclosure, the fluid contained in the bellows 2 expands and increases the volume of this bellows 2 which pushes a boss 50 of the lever 3 which itself gradually moves until it reaches a position such that the contacts C 1 , C 2 of the switch 1 abruptly abut one against the other (position engaged of the thermostat) putting into service the cold generating device (a compressor for example).
  • the temperature then drops in the enclosure, the fluid contained in the bellows 2 decreases in volume as well as this bellows 2, and the lever 3, returned by the spring 4, returns to its initial position.
  • the operating cycle is completed.
  • temperature regulation is essentially ensured by limiting between two prefixed values the variation of the temperature of the evaporator of the cold generating device, as shown by curves a, b, d of FIG. 2, curves b and a respectively showing two examples of operation (normal and cooler) of the cold generator, for which the two set limit values are different.
  • Curve d represents the temperature variations when the lever 90 is in the defrosting position of the refrigeration chamber (T> 0 ° C). With such a thermostatic switch, the defrosting operation is completely manual.
  • the tension of the spring 4 is adjusted by the screw 5, so that the closing moment of the switch 1 is reached for a determined value of the temperature of the enclosure.
  • the thermostatic switch shown diagrammatically in FIG. 3, comprises in known manner, an abrupt contactor provided with a fixed contact C 1 and with a movable contact C 2 , a bellows 2 containing a fluid subjected to temperature variations in the refrigeration chamber with which the thermostat is associated, a first lever 3 provided with a boss 50 and, at one of its ends, a stirrup comprising a tab 7 metal connected to a return spring 4, and a finger 14 of insulating material intended to actuate the movable contact C 2 .
  • This thermostat further comprises a push button 18 fixed on a push rod 10 axially passing through the shaft 9 and having at its free end a curved part, and a second lever 11, called the defrost lever, mobile around a fixed axis O2,
  • This lever 11 is provided, at one of its ends, with a finger 19 and, at a determined distance from the finger 19, on the one hand, a bar 20 provided with an eyelet 21 through which the curved part passes of the push rod 10 and, on the other hand, an element 22 having a rounded shape at its free end so as to form a spout 23, semi-cylindrical for example.
  • a piece 12 having substantially the shape of a U, and made of a material having a certain elasticity, has a branch 121 fixedly fitted on the cam follower 60 and a branch 123 flat, elastic, carrying at its base a pan cut 122 with adjustable tilt by means of a screw 124.
  • the follower 60 associated with the cam 8 is provided with a lug 15 abutting on this cam 8 and with a lug 125 intended to limit the movement of the flat part 123.
  • the thermostat In operation, when the push rod 10 is in the high position, the thermostat normally performs its cyclic operation ensuring the temperature chosen in the refrigerating chamber. In FIG. 3, the contacts Ci and C 2 are glued, and the refrigeration device is in service.
  • the finger 14 then moves and ensures the abrupt opening of the contacts Ci, C 2 of the switch. r.
  • the lever 3 is then subjected, on the one hand, to the return force of the spring 4 which has undergone an elongation due to the displacement of the cam follower 60, as explained above and, on the other hand, to the pressing force of the finger 19 of the lever 11.
  • the system is therefore in a position completely independent of the position of the cam 8, therefore of the operating temperature values initially chosen and corresponding to the position of the assembly formed by the cam 8, its shaft 9 and the temperature control lever 90.
  • FIG. 5 represents the variation curves of the temperature T of the refrigerating enclosure as a function of time t in three cases a, b, c of different settings of the temperature of the enclosure.
  • the defrost temperature T ⁇ is the same, although the switch-on temperatures (y e1 , Y e2 Y e3 ) and the trip temperatures (y d1 , y a2 , Y d3 ) of the thermostat are different.
  • the temperature difference between the switch-on and switch-off temperatures remains the same and results from the adjustment of the thermostat mechanism, but the switch could just as easily have an adjustment allowing operation at variable differential temperature .
  • defrosting operation can be interrupted at any time by pulling the push rod 10.
  • an accelerating defrost resistor can be introduced into the thermostat circuit, its power being applied automatically when the thermostat is put in the defrost position.
  • a second contactor 100 provided with contacts C 3 , C 4 can be introduced into the circuit, this contactor 100, controlled by an additional rotation of the handle 90, allows the general shutdown of the refrigeration device.
  • the cam 8 then comprises a third lug 26 which, when the lever 90 is brought into the "off" position, comes into contact with a lever 101 movable around an axis 0 3 , the lever 101 provided with a finger 102 pushes then a tongue 17 of an elastic blade carrying the movable contact C 4 which then moves away from the fixed contact C 3 .
  • the tongue 17 pivots in a known manner around a pin (not shown).
  • the cold generating device is stopped.
  • the contactors C 1 , C 2 and C 3 , C 4 can be placed in a supply circuit of a compressor C R , as shown in FIG. 7.
  • thermostatic switch according to the invention can be advantageously used in refrigerators with semi-automatic defrost, but also for all cyclic controls depending on variations in temperature or pressure.
  • this switch for controlling an exceptional variation in the temperature or the operating pressure of a device.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Thermally Actuated Switches (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Defrosting Systems (AREA)
EP82401731A 1981-09-29 1982-09-24 Interrupteur électrique thermostatique et réfrigérateur à dégivrage semi-automatique muni d'un tel interrupteur Expired EP0076727B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82401731T ATE18828T1 (de) 1981-09-29 1982-09-24 Thermostatischer schalter und kuehlapparat mit semi-automatischer enteisungsanlage versehen mit einem solchen schalter.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8118348A FR2513808A1 (fr) 1981-09-29 1981-09-29 Interrupteur electrique thermostatique et refrigerateur a degivrage semi-automatique muni d'un tel interrupteur
FR8118348 1981-09-29

Publications (2)

Publication Number Publication Date
EP0076727A1 EP0076727A1 (fr) 1983-04-13
EP0076727B1 true EP0076727B1 (fr) 1986-03-26

Family

ID=9262569

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401731A Expired EP0076727B1 (fr) 1981-09-29 1982-09-24 Interrupteur électrique thermostatique et réfrigérateur à dégivrage semi-automatique muni d'un tel interrupteur

Country Status (9)

Country Link
US (1) US4500760A (enrdf_load_stackoverflow)
EP (1) EP0076727B1 (enrdf_load_stackoverflow)
JP (1) JPS5866222A (enrdf_load_stackoverflow)
KR (1) KR890001256B1 (enrdf_load_stackoverflow)
AT (1) ATE18828T1 (enrdf_load_stackoverflow)
CA (1) CA1197538A (enrdf_load_stackoverflow)
DE (1) DE3270134D1 (enrdf_load_stackoverflow)
DK (1) DK155476C (enrdf_load_stackoverflow)
FR (1) FR2513808A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996013755A1 (en) 1994-10-26 1996-05-09 Eastman Kodak Company Photographic emulsions of enhanced sensitivity

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4709126A (en) * 1986-10-02 1987-11-24 Furnas Electric Company Pressure switch with rolling diaphragm
US6252492B1 (en) 1999-03-18 2001-06-26 James P. Frank Condition-responsive electric switch mechanism
JP3994951B2 (ja) * 2003-09-22 2007-10-24 松下電器産業株式会社 サーモスタット
JP4440077B2 (ja) * 2004-11-09 2010-03-24 パナソニック株式会社 サーモスタット

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1566596A (enrdf_load_stackoverflow) * 1968-02-22 1969-05-09

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1045992A (fr) * 1951-11-29 1953-12-02 Fr Des Thermostats Soc Dispositif de réglage de thermostat et de dégivrage automati?ue pour appareils producteurs de froid
DE1147245B (de) * 1961-06-21 1963-04-18 Licentia Gmbh Kuehlschrankthermostat mit halbautomatischer Abtauvorrichtung
GB1012788A (en) * 1964-05-19 1965-12-08 Ranco Inc Control switch for cycling and defrosting refrigerating apparatus
FR2069915B1 (enrdf_load_stackoverflow) * 1969-12-04 1973-03-16 Sopac Regulation
DE2535874C3 (de) * 1975-08-12 1978-04-13 Danfoss A/S, Nordborg (Daenemark) Druckabhängig betätigter elektrischer Schalter, insbesondere Verdampferthermostat für Kühlschränke
JPS5426562A (en) * 1977-08-01 1979-02-28 Saginomiya Seisakusho Inc Normal defrostinggcombined thermostat
US4274546A (en) * 1977-12-29 1981-06-23 Robertshaw Controls Company Condition responsive electrical switch construction and parts and methods therefor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1566596A (enrdf_load_stackoverflow) * 1968-02-22 1969-05-09

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996013755A1 (en) 1994-10-26 1996-05-09 Eastman Kodak Company Photographic emulsions of enhanced sensitivity

Also Published As

Publication number Publication date
FR2513808B1 (enrdf_load_stackoverflow) 1985-03-08
JPH0429169B2 (enrdf_load_stackoverflow) 1992-05-18
FR2513808A1 (fr) 1983-04-01
EP0076727A1 (fr) 1983-04-13
JPS5866222A (ja) 1983-04-20
ATE18828T1 (de) 1986-04-15
DE3270134D1 (en) 1986-04-30
KR840001768A (ko) 1984-05-16
DK155476B (da) 1989-04-10
KR890001256B1 (ko) 1989-04-28
US4500760A (en) 1985-02-19
DK155476C (da) 1989-08-14
DK427882A (da) 1983-03-30
CA1197538A (en) 1985-12-03

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