EP1212769B1 - Druckschalter mit thermischem ausschalter - Google Patents

Druckschalter mit thermischem ausschalter Download PDF

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Publication number
EP1212769B1
EP1212769B1 EP01957864A EP01957864A EP1212769B1 EP 1212769 B1 EP1212769 B1 EP 1212769B1 EP 01957864 A EP01957864 A EP 01957864A EP 01957864 A EP01957864 A EP 01957864A EP 1212769 B1 EP1212769 B1 EP 1212769B1
Authority
EP
European Patent Office
Prior art keywords
electrical
closure
cut
electrical contacts
movement
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
EP01957864A
Other languages
English (en)
French (fr)
Other versions
EP1212769A2 (de
Inventor
Lorenzo Arrabito
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.)
Ne-Ma SpA
Original Assignee
Ne-Ma SpA
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 Ne-Ma SpA filed Critical Ne-Ma SpA
Publication of EP1212769A2 publication Critical patent/EP1212769A2/de
Application granted granted Critical
Publication of EP1212769B1 publication Critical patent/EP1212769B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/62—Manual reset mechanisms which may be also used for manual release with means for preventing resetting while abnormal condition persists, e.g. loose handle arrangement
    • 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
    • H01H35/34—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by diaphragm
    • 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
    • H01H37/5409—Bistable switches; Resetting means

Definitions

  • the present invention relates to a pressure switch or pressure-controlled automatic electric cut-out, to be fitted, in particular, in machines such as compressors, autoclaves or pumps which can supply fluid under pressure and are driven by electric motors.
  • Document FR 1 355 293 discloses a pressure switch according to the preamble of claim 1.
  • the invention relates to a pressure switch provided for breaking the electrical-supply circuit to the motor and discharging the pressurized fluid when the pressure exceeds a predetermined value, of the type comprising a support structure, a diaphragm which is fixed to the support structure and is intended to be exposed to the pressurized fluid, electrical contacts mounted on the support structure and arranged for movement towards and away from one another between a position of closure and a position of opening of an electrical-supply circuit of the motor, a manually-operable control member movable manually between two positions in which it brings about movement of the electrical contacts to their positions of opening and of closure of the electrical circuit, arid a lever mechanism operatively associated with the diaphragm and with the electrical contacts in a manner such that, when a pressure above a predetermined threshold value is applied to the diaphragm, the lever mechanism brings about movement of the electrical contacts to the open position, stopping the motor.
  • the pressure switch also comprises a discharge valve, mounted on the support, for connection to the source of fluid under pressure; when the electrical contacts are in the open position, with consequent stoppage of the electric motor, the valve is brought to its open position in order to discharge the pressurized fluid to the exteriorly
  • the electrical-supply circuit of the motor can be reset to its closure condition to enable the motor to be started only when the pressure has returned below the predetermined threshold value as a result of the opening of the discharge valve.
  • a thermal cut-out is usually associated with the motor and is arranged to break the electrical-supply circuit of the motor as a result of overheating due, for example, to excessive current absorption.
  • the main disadvantage connected with the above-mentioned solution is that, after a stoppage of the motor due to the opening of the thermal cut-out, the operator may instinctively reset the cut-out to its closure position without previously having isolated the supply circuit; this operation is liable to give rise to sparks which often cause the contacts of the thermal switch to "stick", rendering it inoperative.
  • the subject of the invention is a pressure switch of the above-mentioned type, characterized in that it incorporates a temperature-sensitive thermal cut-out which is mounted on the support structure of the pressure switch, in series with the electrical-supply circuit of the motor, and is arranged to open the electrical-supply circuit automatically when the temperature exceeds a predetermined value, the cut-out being operable manually in order to be reset to a position of closure of the electrical circuit, which position is stable when the temperature is below the predetermined value, and the cut-out being operatively associated with the control member in a manner such that the thermal cut-out is reset to its closure position as a result of the manual movement of the control member to its position which brings about opening of the electrical contacts.
  • the pressure switch to which the invention relates is of a known type and is widely available commercially; for example, the pressure switches concerned are the single-phase pressure switches produced and marketed by the Applicant under the trademark NE-MA, which are used widely in association with small compressors of low power driven by single-phase electric motors.
  • NE-MA the pressure switch concerned
  • the structural principle upon which the invention is based may be used in pressure switches of any type having functions similar to those of the above-mentioned pressure switch.
  • the pressure switch comprises a support structure 1 with a cover 2, associated with which is a push-button 3 which is operable manually and can snap between an extended, ON position and a retracted OFF position in which, as will be described in greater detail below, the electrical-supply circuit to a motor M of the compressor is closed and is open, respectively.
  • a diaphragm 4 associated with the support structure 1 is exposed to the fluid pressure when the pressure switch is connected to the pressure source by means of a threaded connector 5.
  • the pressure switch connects the electrical-supply line to the motor by means of a terminal block 7 which comprises a first pair 9, 9a and a second pair 10, 10a of fixed contacts, and a slider member 13 with which a first pair 11, 11a, and a second pair 12, 12a of movable contacts are associated.
  • the slider 13 arid the movable contacts associated therewith are movable between a position of opening and a position of closure of the electrical-supply circuit of the motor.
  • the slider 13 can be brought to its position in which the electrical contacts are open by the manual operation of the manual reset button 3.
  • pressure exerted on the push-button 3 brings about axial movement of the slider and opening of the electrical circuit; when the push-button 3 is returned to its extended position, the slider 13 re-establishes the closure of the electrical circuit under the action of resilient means.
  • the invention is not intended to be limited to the specific configuration described above and includes all functionally equivalent solutions.
  • the slider 13 is operatively associated, by resilient means 15, with a snap-lever mechanism 14 which in turn is operatively associated with the diaphragm 4.
  • a snap-lever mechanism 14 which in turn is operatively associated with the diaphragm 4.
  • the pressure switch incorporates a thermal cut-out 17 mounted in series with the electrical-supply circuit.
  • This cut-out is typically constituted by a temperature-sensitive, bistable, bimetal-strip cut-out which is arranged to open the electrical-supply circuit when the heating effect produced by the current flowing through the bimetal strip heats the strip to a predetermined threshold value.
  • Bimetal-strip thermal cut-outs are known per se and do not require detailed description.
  • the cut-out comprises an axially-movable rod-like operating member 18 which acts on the strip to reset its closure position, which is stable when the temperature of the strip is below the predetermined threshold value.
  • the rod 18 is operatively associated with the push-button 3 by means of a pressure element 19 in a manner such that, in order to reset the thermal cut-out to its closure position, it is necessary to move the push-button 3 to-its OFF position which brings about preliminary opening of the electrical contacts and opening of the air-valve 16.
  • the movement of the push-button 3 to its retracted, OFF position brings about axial movement of the rod which pushes the strip to its closure position.
  • Figure 2 shows the pressure switch schematically in its normal-operation configuration in which the movable contacts and the thermal cut-out are in the configuration in which the electrical circuit is closed.
  • Figure 3 shows the configuration in which, as a result of overheating produced, for example, by an excessive absorption of electrical energy, the thermal cut-out has snapped to its open configuration, interrupting the electrical supply to the motor.
  • Figure 4 shows the configuration in which, by acting on the push-button 3, the operator has reset the closure position of- the thermal cut-out and the movable contacts are correspondingly in their position in which the electrical circuit is open.
  • the pressure switch according to the invention achieves the important advantage of ensuring that the thermal cut-out cannot be reset when the circuit is live; moreover, since the movement of the push-button 3 to its OFF position provides for the discharge of the compressed air in the head of the compressor as well as disconnecting the motor, starting of the motor under load (with the head under pressure) is prevented; finally, for the above-mentioned reasons, the motor is prevented from working without protection; this characteristic is particularly important since the operator cannot generally check visually for damage or sticking of the thermal cut-out.
  • the incorporation of the thermal cut-out in the pressure switch also eliminates the manual operations connected with the installation of commercial thermal cut-outs in the connection line to the motor.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Thermally Actuated Switches (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Push-Button Switches (AREA)

Claims (4)

  1. Druckschalter für einen Kompressor oder ein ähnliches Gerät, das ein unter Druck stehendes Fluid zuführen kann und von einem Elektromotor angetrieben wird, wobei der Druckschalter enthält:
    einen Tragaufbau (1),
    eine Membran (4), die am Tragaufbau (1) befestigt ist und dem unter Druck stehenden Fluid ausgesetzt wird,
    elektrische Kontakte (9, 10, 11, 12), die am Tragaufbau (1) befestigt und so angeordnet sind, dass sie sich zueinander und voneinander zwischen einer Stellung, in der sie eine Stromanspeisung des Motors schließen, und einer Stellung bewegen können, in der sie die Stromanspeisung öffnen,
    ein von Hand zu betätigendes Steuerelement (3), das händisch zwischen zwei Stellungen bewegbar ist, in denen die elektrischen Kontakte in jenen Stellungen liegen, in denen der Stromkreis geöffnet bzw. geschlossen ist, sowie
    eine Hebeleinrichtung (14), die betriebsmäßig der Membran (4) und den elektrischen Kontakten so zugeordnet ist, dass dann, wenn ein Druck oberhalb eines vorgegebenen Schwellenwerts an die Membran gelegt wird, die Hebeleinrichtung eine Bewegung der elektrischen Kontakte in die offene Stellung verursacht, wobei der Druckschalter weiters einen temperaturempfindlichen thermischen Trennschalter (17) enthält, der auf dem Tragaufbau (1) des Druckschalters angebracht ist und mit der Stromversorgungsstufe des Motors in Serie geschaltet ist, wobei er dazu dient, um die Stromversorgungsstufe automatisch zu öffnen, wenn die Temperatur einen vorgegebenen Wert überschreitet, wobei der Trennschalter händisch betätigt werden kann, um ihn in eine geschlossene Stellung zurück zu setzen, in der er stabil ist, wenn die Temperatur unterhalb des vorgegebenen Werts liegt, dadurch gekennzeichnet, dass der Trennschalter betriebsmäßig dem Steuerelement (3) so zugeordnet ist, dass der Trennschalter dadurch in seine geschlossenen Stellung zurückgesetzt wird, dass das Steuerelement in jene Stellung bewegt wird, die zu einer Öffnung der elektrischen Kontakte führt.
  2. Druckschalter gemäß Anspruch 1, dadurch gekennzeichnet, dass der thermische Trennschalter ein bistabiler Bimetallstreifen-Trennschalter (17) ist.
  3. Druckschalter gemäß Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, dass das händisch betätigte Steuerelement (3) zwischen einer Ausgangsstellung und einer Endstellung schnappen kann und mit einem Schlitten (13), dem die bewegbaren Kontakte (11, 12) zugeordnet sind, sowie mit einem Stellglied (18) des thermischen Trennschalters (17) so zusammen wirkt, dass eine händische Bewegung des Steuerelements (3) aus der Ausgangsstellung in die Endstellung eine Bewegung des Schlittens (13) und der elektrischen Kontakte (11, 11a, 12, 12a) in die geschlossene Stellung der Kontakte sowie eine Bewegung des Stellglieds (18) in die Schließstellung des thermischen Trennschalters (17) verursacht.
  4. Druckschalter gemäß Anspruch 3, wobei das Stellglied (18) des thermischen Trennschalters nicht mit dem Steuerelement (3) verbunden ist, so dass der thermische Trennschalter in seiner geschlossenen Stellung gehalten wird, nachdem sich das Steuerelement aus der Stellung einer Öffnung in die Stellung einer Schließung der elektrischen Kontakte bewegt hat.
EP01957864A 2000-06-20 2001-06-19 Druckschalter mit thermischem ausschalter Expired - Lifetime EP1212769B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITTO000590 2000-06-20
IT2000TO000590A IT1320508B1 (it) 2000-06-20 2000-06-20 Pressostato dotato di un interruttore di protezione termica.
PCT/EP2001/006908 WO2001099134A2 (en) 2000-06-20 2001-06-19 A pressure switch provided with a thermal cut-out

Publications (2)

Publication Number Publication Date
EP1212769A2 EP1212769A2 (de) 2002-06-12
EP1212769B1 true EP1212769B1 (de) 2003-05-14

Family

ID=11457832

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01957864A Expired - Lifetime EP1212769B1 (de) 2000-06-20 2001-06-19 Druckschalter mit thermischem ausschalter

Country Status (6)

Country Link
EP (1) EP1212769B1 (de)
AT (1) ATE240583T1 (de)
AU (1) AU2001279671A1 (de)
DE (1) DE60100273T2 (de)
IT (1) IT1320508B1 (de)
WO (1) WO2001099134A2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202010016555U1 (de) 2009-12-14 2011-02-17 Ne-Ma S.R.L. Druckschalter mit Stundenzähler
CN104323707B (zh) * 2014-11-10 2016-09-14 佛山市高明欧一电子制造有限公司 电压力锅非自动复位的压力断路器安全装置

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102420075B (zh) * 2010-09-27 2013-08-28 中国北车集团大同电力机车有限责任公司 一种压力开关
US8845301B2 (en) 2011-06-29 2014-09-30 Ford Global Technologies, Llc Compressor control method
EP3199888A1 (de) * 2016-01-29 2017-08-02 Daikin Industries, Limited Klimaanlage
CN107611926B (zh) * 2017-09-15 2020-11-06 珠海格力电器股份有限公司 一种过载保护装置、方法、存储介质、压缩机及电器

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB434064A (en) * 1934-01-29 1935-08-26 Igranic Electric Co Ltd Improvements in or relating to circuit controlling devices, particularly applicable to electric refrigerators
US2257477A (en) * 1938-10-07 1941-09-30 Honeywell Regulator Co Combined pressure and safety switch
FR1355293A (fr) * 1963-04-30 1964-03-13 Perfectionnements à l'appareillage de régulation et de protection des groupes motopompes ou moto-compresseurs
DE2605378C3 (de) * 1976-02-11 1978-10-19 Helmut 8120 Weilheim Stoeger Regel- oder Steuergerät mit Überstromschutzeinrichtung
US5552646A (en) * 1994-11-01 1996-09-03 Condor Werke-Gebruder Frede Gmbh & Co Kg Compact control and monitoring switch

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202010016555U1 (de) 2009-12-14 2011-02-17 Ne-Ma S.R.L. Druckschalter mit Stundenzähler
CN104323707B (zh) * 2014-11-10 2016-09-14 佛山市高明欧一电子制造有限公司 电压力锅非自动复位的压力断路器安全装置

Also Published As

Publication number Publication date
WO2001099134A3 (en) 2002-03-14
ITTO20000590A1 (it) 2001-12-20
IT1320508B1 (it) 2003-12-10
DE60100273T2 (de) 2004-04-08
ITTO20000590A0 (it) 2000-06-20
ATE240583T1 (de) 2003-05-15
EP1212769A2 (de) 2002-06-12
WO2001099134A2 (en) 2001-12-27
DE60100273D1 (de) 2003-06-18
AU2001279671A1 (en) 2002-01-02

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