WO2023286102A1 - Dispositif de limitation de température - Google Patents

Dispositif de limitation de température Download PDF

Info

Publication number
WO2023286102A1
WO2023286102A1 PCT/IT2022/050209 IT2022050209W WO2023286102A1 WO 2023286102 A1 WO2023286102 A1 WO 2023286102A1 IT 2022050209 W IT2022050209 W IT 2022050209W WO 2023286102 A1 WO2023286102 A1 WO 2023286102A1
Authority
WO
WIPO (PCT)
Prior art keywords
lid
resin
disc
protective cover
spring
Prior art date
Application number
PCT/IT2022/050209
Other languages
English (en)
Inventor
Nicola RODEGHIERO
Antonio Rodeghiero
Original Assignee
Miotti S.R.L.
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 Miotti S.R.L. filed Critical Miotti S.R.L.
Priority to EP22757702.0A priority Critical patent/EP4371139A1/fr
Publication of WO2023286102A1 publication Critical patent/WO2023286102A1/fr

Links

Classifications

    • 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
    • H01H37/5427—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting encapsulated in sealed miniaturised housing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/04—Bases; Housings; Mountings
    • 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
    • H01H2037/5463—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting the bimetallic snap element forming part of switched circuit
    • 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
    • H01H2037/5481—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting the bimetallic snap element being mounted on the contact spring
    • 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
    • H01H9/02—Bases, casings, or covers
    • H01H9/04—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings

Definitions

  • the present invention relates to a temperature limiting device for protecting electrical apparatuses and the like, as well as a method for manufacturing said device.
  • the bimetallic disc is capable of moving from a low temperature position to a high temperature position in which it acts on the spring-loaded disc to open the electrical circuit and thereby interrupt heating.
  • a temperature limiting device of this type is shown for example in European patent EP 0 678891.
  • This temperature limiter comprises an external container defining a cup-shaped housing, closed by a lid, inside which a bimetallic disc and a spring-loaded disc are arranged in a stack.
  • the lid carries the fixed contact of the changeover switch, while the spring-loaded disc carries the movable contact.
  • the movable contact In the normal operating condition, i.e. at low temperature, the movable contact is pressed by the spring-loaded disc against the fixed contact and thus closes the electrical circuit, allowing the current to flow.
  • the bimetallic disc reverses its position, consequently moving the spring-loaded disc. In this way the movable contact is detached from the fixed contact and the electrical circuit opens, interrupting the flow of current and heating.
  • the bimetallic thermal switch is usually inserted inside the stator winding of the electric motor, during the motor manufacturing step, so that the thermal switch is in direct thermal coupling with the winding.
  • the used resins require the use of a kiln to complete the polymerization, or long curing times at room temperature. This involves a pause in the production flow, which is necessary for the the heat treatment to be completed, be it at room temperature or at high temperature. The production process is affected by this pause, as a continuous flow of production is not achieved.
  • the aim of the present invention is to solve the aforementioned problems, by devising a temperature limiting device that has an outer container coating that achieves optimal protection from external agents.
  • a further object of the invention is to provide a temperature limiting device of simple construction and functional design, having reliable operation, versatile use, as well as relatively inexpensive cost.
  • the temperature limiting device comprises an external container defining a cup-shaped housing, closed by a lid, inside which a spring-loaded disc and a bimetallic disc are stacked.
  • said outer container is made of conductive material.
  • said lid is made of insulating material.
  • said lid is made of a combination of materials such as to be isolated with respect to said external container.
  • the bimetallic disc is axially associated with said spring-loaded disc.
  • the temperature limiting device comprises at least one fixed contact integral with said lid of the outer container and protruding for a portion thereof above the same lid and at least one movable contact integral with said spring-loaded disc.
  • the temperature limiting device comprises a protective cover of insulating material which extends to cover said lid, said portion of the fixed contact protruding above the lid and a curved edge of said outer container and is made of resin adapted to polymerize by exposure to a source of UV rays.
  • said UV rays have a wavelength in the range 320-450 nm.
  • said UV source consists of UV lamps with an intensity in the range 50-200 mW/cm 2 .
  • said protective cover is made by means of an epoxy-based resin or epoxy polyester with a trigger and hardening mechanism by means of said UV rays.
  • said protective cover is dome-shaped and at least partially embeds the connection cables of the temperature limiting device.
  • said curved edge faces the inside of said outer container so as to retain said lid.
  • said movable contact comprises a movable bridge integral, by axial securing means, to said spring-loaded disc and to said bimetallic disc, tightened in pack.
  • said movable bridge has a circular shape and it can be brought in abutment to a pair of fixed contacts.
  • said bimetallic disc is made up of a foil made by coupling iron and copper.
  • said bimetallic disc is arch-shaped, so as to abut peripherally on the edge of said spring-loaded disc.
  • the present invention also relates to a method for manufacturing a temperature limiting device which provides for coating at least the upper part of the external container of conductive material of the device with a protective cover made of resin suitable for polymerizing through exposure to a source of UV rays.
  • said protective cover of insulating material extends to cover a lid of said external container of conductive material, a portion of a fixed contact integral with said lid of the external container and protruding above said lid and a curved edge of said external container.
  • Figure 1 shows an axial sectional view of the temperature limiting device according to the present invention
  • Figure 2 shows the same axial sectional view of the temperature limiting device in a different operative configuration
  • Figure 3 shows a similar axial sectional view of a different embodiment of the temperature limiting device according to the present invention.
  • the temperature limiting device according to the present invention is indicated as a whole with the reference numeral 1.
  • the temperature limiting device comprises an external container 2 defining a cup-shaped housing 3.
  • the housing 3 of the external container 2 is closed at the top by a lid 4, retained by a peripheral curved edge 5 of the external container 2.
  • the external container 2 is made of conductive material, for example brass.
  • the lid 4 is made of insulating material, such as for example ceramic material and the like, or alternatively of a combination of materials, including metal, but such as to be insulated with respect to the external container 2.
  • a spring-loaded disc 6 and a bimetallic disc 7 are arranged in a stack.
  • the spring-loaded disc 6 is preferably made of stainless steel coated with a precious material, for example silver; the bimetallic disc 7 is preferably constituted by a foil made by coupling iron and copper.
  • the lid 4 is tightened against a spacer member 8 of annular shape, which in turn rests peripherally on an annular shoulder 9 internally shaped by the external container 2.
  • a spacer member 8 of annular shape, which in turn rests peripherally on an annular shoulder 9 internally shaped by the external container 2.
  • the lid 4 and the spacer member 8 are packed against the annular shoulder 9 by the curved edge 5 of the outer container 2, suitably riveted.
  • the spacer member 8 is made, for example, of brass or the like.
  • the cover 4 carries axially inserted, in a way known per se, a fixed contact 10 of the thermal switch; the spring-loaded disc 6 carries in turn axially inserted a movable contact
  • the fixed contact 10 is protruding below the lid 4; the movable contact 11 is protruding above the bimetallic disc 7, through an axial hole made in the same bimetallic disc 7.
  • the contacts 10, 11 are preferably made of precious metal, for example silver, or an alloy thereof, or a composition of a precious metal with a conductive metal, for example copper rod and silver head.
  • the outer container 2 is coated above the lid 4 with a protective dome-shaped cover 12 of insulating material.
  • the protective dome 12 extends to completely cover the lid 4, the portion of the fixed contact 10 protruding above the lid 4 and the curved edge 5 of the outer container 2, or at least the inner part of said curved edge 5.
  • the protective dome 12 also embeds the cables 13, 14 connecting respectively to the outer container 2 and to the fixed contact 10. It should be noted that it is not necessary for the cable 13 for connecting to the outer container 2 to be covered by the protection dome
  • the protective dome 12 is made of a resin adapted to polymerize by exposure to a source of UV rays.
  • said resin adapted to polymerize by exposure to a source of UV rays consists of an epoxy-based resin or epoxy-polyester with triggering and hardening ultraviolet mechanism.
  • the UV source preferably consists of UV lamps with a wavelength 320-450 nm, with intensity in the range 50-200 mW/cm 2 .
  • the spring-loaded disc 6 and the bimetallic disc 7 are centered and secured between the base of the housing 3 defined by the outer container 2 of conductive material and the lid 4 carrying the fixed contact 10 integrated.
  • the spring-loaded disc 6 constitutes the element through which the electric current passes and supports the movable contact 11 which is kept under constant pressure against the fixed contact 10 (Fig. 1 ).
  • the bimetallic disc 7, supported by the movable contact 11 that passes therethrough, is able to react to any changes in the temperature of the apparatus to be protected.
  • the bimetallic disc 7 clicks into the reverse position, with the concavity downwardly facing, and pushes the spring-loaded disc 6 downwards (Fig. 2).
  • FIG. 3 shows a different embodiment of the temperature limiting device in which the lid 4 of the outer container 2 carries a pair of fixed contacts, for clarity indicated with reference numerals 10a and 10b.
  • the fixed contacts 10a and 10b cross the lid 4 in parallel positions with respect to each other and are protruding for a portion thereof from the lid 4 itself.
  • a movable bridge 15 Inside the housing 3 defined by the outer container 2 is arranged a movable bridge 15, of circular shape, adapted to be brought in abutment with the fixed contacts 10a and 10b.
  • the movable bridge 15 is made integral, by means of an axial rivet 16, to the tightly packed spring-loaded disc 6 and bimetallic disc 7. Basically, the movable bridge 15 performs the same function performed, in the previous solution, by the movable contact 11.
  • the movable bridge 15 is preferably made of brass, bronze or the like, coupled with a precious metal or an alloy thereof such as silver or the like, with or without a precious metal coating.
  • the spring-loaded disc 6 is secured against a circular seat obtained inside the housing 3 by a spacer ring 17.
  • the temperature limiting device according to the present invention achieves the purpose of having a coating of the outer container which provides optimal protection against external agents, in particular such as to prevent the entry of chemicals and other liquid

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Thermally Actuated Switches (AREA)
  • Glass Compositions (AREA)
  • Inorganic Insulating Materials (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)

Abstract

L'invention concerne un dispositif de limitation de température comprenant un récipient externe (2) définissant un logement en forme de coupelle (3), fermé par un couvercle (4), à l'intérieur duquel sont empilés un disque à ressort (6) et un disque bimétallique (7). Le couvercle (4) du récipient externe (2) et le disque à ressort (6) comportent, d'un seul tenant avec celui-ci, un contact fixe (10) et au moins un contact mobile (11, 15) respectivement. Un couvercle de protection (12) en matériau isolant en résine approprié pour la polymérisation par exposition à une source de rayons UV est placé au-dessus du couvercle (4).
PCT/IT2022/050209 2021-07-15 2022-07-15 Dispositif de limitation de température WO2023286102A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP22757702.0A EP4371139A1 (fr) 2021-07-15 2022-07-15 Dispositif de limitation de température

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102021000018770A IT202100018770A1 (it) 2021-07-15 2021-07-15 Dispositivo limitatore di temperatura
IT102021000018770 2021-07-15

Publications (1)

Publication Number Publication Date
WO2023286102A1 true WO2023286102A1 (fr) 2023-01-19

Family

ID=78086728

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2022/050209 WO2023286102A1 (fr) 2021-07-15 2022-07-15 Dispositif de limitation de température

Country Status (3)

Country Link
EP (1) EP4371139A1 (fr)
IT (1) IT202100018770A1 (fr)
WO (1) WO2023286102A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04303525A (ja) * 1991-03-29 1992-10-27 Omron Corp スイッチ構造
DE102004014028A1 (de) * 2004-03-19 2005-10-06 Marcel Hofsaess Schutz-Temperatur-Begrenzer mit integriertem Heizelement
DE102013102006A1 (de) * 2013-02-28 2014-08-28 Marcel P. HOFSAESS Temperaturabhängiger Schalter
US20150279596A1 (en) * 2014-03-27 2015-10-01 Tyco Electronics Japan G.K. Insulated Thermal Cut-Off Device
US20170076893A1 (en) * 2014-03-14 2017-03-16 Omron Corporation Electronic-device seal structure and electromagnetic relay using said electronic-device seal structure

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9406806U1 (de) 1994-04-23 1995-06-01 Thermik Gerätebau GmbH, 75181 Pforzheim Bimetallschalter, insbesondere stromabhängiger Schalter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04303525A (ja) * 1991-03-29 1992-10-27 Omron Corp スイッチ構造
DE102004014028A1 (de) * 2004-03-19 2005-10-06 Marcel Hofsaess Schutz-Temperatur-Begrenzer mit integriertem Heizelement
DE102013102006A1 (de) * 2013-02-28 2014-08-28 Marcel P. HOFSAESS Temperaturabhängiger Schalter
US20170076893A1 (en) * 2014-03-14 2017-03-16 Omron Corporation Electronic-device seal structure and electromagnetic relay using said electronic-device seal structure
US20150279596A1 (en) * 2014-03-27 2015-10-01 Tyco Electronics Japan G.K. Insulated Thermal Cut-Off Device

Also Published As

Publication number Publication date
IT202100018770A1 (it) 2023-01-15
EP4371139A1 (fr) 2024-05-22

Similar Documents

Publication Publication Date Title
DK2775495T3 (en) Thermal contact with the insulation washer
AU746905B2 (en) Temperature-dependent switch having a current transfer member
JP4170232B2 (ja) バイメタルを用いた安全装置
CN110047698B (zh) 温控开关
EP4371139A1 (fr) Dispositif de limitation de température
EP2547185B1 (fr) Commutateur avec boîtier de protection et son procédé de production
US10755880B2 (en) Temperature-dependent switch with cutting burr
US20120126930A1 (en) Bimetal part and temperature-dependent switch equipped therewith
CN111952117B (zh) 温控开关
EP1064826A2 (fr) Dispositif de chauffage
CN103377850B (zh) 温控开关
CN112542350A (zh) 温控开关
CN111916307B (zh) 温控开关
US11062869B2 (en) Temperature sensitive pellet type thermal fuse
US6823580B2 (en) Method of producing a temperature-dependent switch with stamped-on adhesive layer
JP7124039B2 (ja) 温度依存スイッチ
CA2431456A1 (fr) Bouton de reglage de la temperature d'un chauffe-eau
CN112542349B (zh) 温控开关
WO1990009672A1 (fr) Dispositif de chauffage destine a etre immerge
EP4371138A1 (fr) Dispositif de limitation de température
JPH0315325B2 (fr)
GB2193563A (en) Liquid heater
CN2450779Y (zh) 可调式温度电流保护器
JP2005135749A (ja) 電気製品用安全部品
WO2004025818A1 (fr) Dispositif de commande electronique pour moteur

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22757702

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2022757702

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2022757702

Country of ref document: EP

Effective date: 20240215