EP3796360A1 - Commutateur dépendant de la température - Google Patents

Commutateur dépendant de la température Download PDF

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Publication number
EP3796360A1
EP3796360A1 EP20196508.4A EP20196508A EP3796360A1 EP 3796360 A1 EP3796360 A1 EP 3796360A1 EP 20196508 A EP20196508 A EP 20196508A EP 3796360 A1 EP3796360 A1 EP 3796360A1
Authority
EP
European Patent Office
Prior art keywords
cover part
sealing ring
switch
temperature
switch according
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.)
Granted
Application number
EP20196508.4A
Other languages
German (de)
English (en)
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EP3796360B1 (fr
Inventor
Marcel P. Hofsaess
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Individual
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Individual
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Publication of EP3796360A1 publication Critical patent/EP3796360A1/fr
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Publication of EP3796360B1 publication Critical patent/EP3796360B1/fr
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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
    • 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
    • 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
    • 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-dependent switch with a housing which has a cover part with an underside and an upper side and an electrically conductive lower part, with a first outer contact surface arranged on the upper side of the cover part and a second outer contact surface provided on the outside of the housing, and with a temperature-dependent switching mechanism arranged in the housing, which, depending on its temperature, establishes or opens an electrically conductive connection between the first and second outer contact surfaces, with a circumferential cutting burr acting as a sealing means being provided on the lower part, which is either inserted into an between the underside of the cover part and the lower part arranged insulating film or penetrates directly into the cover part.
  • the cover part essentially depends on the design of the temperature-dependent switch. This is because it can either be provided that the cover part is made of an electrically conductive material or of an electrically insulating material. If the cover part is made of an electrically conductive material, an insulating film, into which the cutting burr penetrates, is arranged between the cover part and the lower part. If, on the other hand, the cover part is made of an electrically insulating material, this preferably rests directly on the lower part (without the interposition of an insulating film) and the cutting burr penetrates directly into the cover part.
  • the known temperature-dependent switch is used in a manner known per se to monitor the temperature of a device. For this purpose, it is brought into thermal contact with the device to be protected, for example via one of its outer surfaces, so that the temperature of the device to be protected influences the temperature of the switching mechanism.
  • the switch is typically connected electrically in series to the supply circuit of the protective device switched so that below the response temperature of the switch, the supply current of the device to be protected flows through the switch.
  • the known switch has a lower part in which an internally encircling shoulder is provided, on which the cover part rests either directly or with the interposition of an insulating film.
  • the cover part is held firmly on this circumferential shoulder by a raised circumferential wall of the lower part that is bent radially inward at its upper section.
  • the temperature-dependent switching mechanism of the DE 10 2015 114 248 B4 known switch has a spring snap disk which carries a movable contact part, as well as a bimetal snap disk slipped over the movable contact part.
  • the spring snap disk presses the movable contact part against a stationary mating contact on the inside of the cover part. With its edge, the spring snap disk is supported in the lower part of the housing, so that the electrical current flows from the lower part through the spring snap disk and the movable contact part into the stationary mating contact and from there into the cover part.
  • the attachment of the two external connections differs depending on the design of the temperature-dependent switch. If the cover part is made of an electrically conductive material, a first external contact surface which is arranged centrally on the cover part typically serves as the first external connection. A second external contact surface provided on the bent wall of the lower part then serves as the second external connection. However, it is also possible, in this design of the switch, not to arrange the second external connection on the bent edge, but instead on the side of the lower part or on the underside of the lower part.
  • a current transfer element in the form of a contact bridge is preferably attached to the spring snap-action disk, which is pressed by the spring snap-action disk against two stationary counter-contacts provided on the underside of the cover part.
  • the cover part is made of an electrically insulating material
  • a current transfer element in the form of a contact bridge is preferably attached to the spring snap-action disk, which is pressed by the spring snap-action disk against two stationary counter-contacts provided on the underside of the cover part.
  • not only the first but also the second outer contact surface is on top of the Cover part arranged.
  • the two mating contacts are connected to the two outer contact surfaces through the cover part.
  • the current then flows from an outer contact surface via the associated mating contact through the contact bridge into the other stationary mating contact and from there to the other outer contact surface, so that the operating current does not flow through the spring snap-action disk itself.
  • This construction is chosen in particular when very high currents have to be switched that can no longer be passed through the spring snap-action disc itself without any problems.
  • a bimetal disc is provided for the temperature-dependent switching function, which rests in the switching mechanism without force below its switching temperature.
  • a bimetal part is understood to mean a multilayer, active, sheet-metal component made up of two, three or four interconnected components with different coefficients of thermal expansion.
  • the connection of the individual layers made of metals or metal alloys are cohesive or form-fitting and are achieved, for example, by rolling.
  • Such a bimetal part has a first stable geometrical configuration in its low-temperature position and a second stable geometrical configuration in its high-temperature position, between which it changes depending on the temperature in the manner of a hysteresis. If the temperature changes above its response temperature or below its return temperature, the bimetal part snaps into the other geometric configuration.
  • the bimetallic part is therefore often referred to as a snap disk, with it typically having an elongated, oval or circular shape in plan view.
  • the bimetal part which is typically designed as a bimetal disk
  • the bimetal disk snaps from its low-temperature configuration to its high-temperature configuration.
  • the bimetal disc works here against the spring snap-action disk so that it lifts the movable contact part from the stationary mating contact or the current transmission element from the two stationary mating contacts, so that the switch opens and the device to be protected is switched off and cannot heat up any further.
  • the bimetallic disk is preferably mounted mechanically free of forces below its critical temperature, the bimetallic disk also not being used to guide the current. This has the advantage that the bimetal disc has a longer mechanical service life and that the switching point, that is to say the transition temperature of the bimetal disc, does not change even after many switching cycles.
  • the bimetal disc can also take over the function of the spring snap-action disc and possibly even the current transmission element, so that the switching mechanism comprises only one bimetal disc, which then carries the movable contact part or has two contact surfaces instead of the current transmission member.
  • the bimetal disc not only ensures the closing pressure of the switch, but also carries the current when the switch is closed.
  • the housing is usually protected from the entry of contaminants by a seal that is applied before or after connecting lugs or connecting cables to the external connections.
  • the DE 196 23 570 A1 known switch that Cover part is provided with a sealing means in the form of a circumferential bead which runs radially on the outside on the underside of the cover part.
  • a sealing means in the form of a circumferential bead which runs radially on the outside on the underside of the cover part.
  • the stiff insulating film becomes wavy as a result of being folded over and forms rosettes which cannot be securely sealed by the upper section of the circumferential wall of the lower part pressing flat on it. There is a risk that coating varnish will penetrate the inside of the switch through the rosettes.
  • the DE 196 23 570 A1 tries to reduce this problem with the already mentioned bead.
  • the DE 10 2013 102 089 B4 describes a switch as it is basically from the DE 196 23 570 A1 is known.
  • This switch has a spacer ring between the shoulder in the lower part and the cover part, which allows a greater switching distance between the movable contact part and the stationary mating contact.
  • the edge region of the insulating film is cut in a V-shape from the outside, as a result of which the waviness is greatly reduced, so that the seal is improved.
  • the DE 10 2013 102 006 B4 also describes a switch of similar design.
  • This switch has a cover part made of PTC material. Because of the lack of pressure stability of this PTC cover, the radially inwardly bent upper section of the circumferential wall of the lower part cannot adequately seal the known switch against the entry of contaminants, which is why the bent upper section of the circumferential wall opposite the top of the cover part must be sealed with silicone, which often causes problems.
  • the DE 10 2013 102 006 B4 solves this problem in that a cover film is provided which rests only on the top of the PTC cover and into which the bent upper section of the circumferential wall of the lower part, lying flat on the cover film, penetrates. The face of the upper section of the circumferential Wall faces away from the cover sheet. However, the flat, upper section of the circumferential wall of the lower part often does not provide the desired seal.
  • a cover film and an insulating film can also be provided on a switch, such as, for example DE 10 2013 102 089 B4 shows.
  • a switch such as, for example DE 10 2013 102 089 B4 shows.
  • an insulating cover foil for example made of Nomex®, which extends with its edge radially outward as far as the insulating foil, which for example consists of Kapton®.
  • Nomex® and Kapton® are made of aramid paper or aromatic polyimides.
  • the cutting burr is created when the lower part is manufactured. It is formed in one piece with the shoulder in the lower part. In this case, the lower part is mostly produced as a turned part, so that the cutting burr is a turning groove that is also produced when the lower part is turned.
  • the present invention is based on the object of eliminating or at least reducing the sealing problems mentioned above in the known switch in a structurally simple and inexpensive manner.
  • this object is achieved according to the invention in that the cutting burr is arranged on a sealing ring which is connected to the lower part with a force fit, form fit and / or material fit.
  • the cutting burr penetrates from below either into the insulating film, if there is one between the lower part and the cover part, or it penetrates directly into the cover part, which is then made of insulating material.
  • the cutting burr serves as a mechanical barrier that creates a type of seal that works by penetrating the cutting burr into the insulating film or the cover part lying above it.
  • the sealing effect is thus achieved by a construction element that represents a mechanical obstacle to the ingress of contamination, that is to say reliably retains both particles and fluids. Creeping paths for liquids, which could otherwise arise between the cover part and the lower part, are almost entirely avoided, so that when the switch is soaked with protective varnish, this protective varnish or other impurities cannot crawl into the interior of the switch.
  • the cutting burr also ensures that no liquid can get into the interior of the switch when it becomes resinous. Even when soldering connection lines to the switch, the penetration of the cutting burr into the insulating film or the cover part prevents solder or corresponding liquids from getting into the interior of the switch.
  • the main advantage of the embodiment according to the invention over that from the DE 10 2015 144 248 B4 known switch consists in that the cutting burr is arranged according to the invention on a sealing ring which is connected to the lower part in a non-positive, positive and / or cohesive manner. According to the invention, the cutting burr is therefore not integrally connected to the lower part of the switch, as shown in the DE 10 2015 114 248 B4 is known, but arranged on an extra sealing ring.
  • This sealing ring together with the cutting burr formed thereon can be easily inserted into the lower part during manufacture of the switch and connected to it, for example, by clamping, welding, soldering or crimping.
  • the cutting burr itself can be formed much more easily on the sealing ring in terms of manufacturing than on the lower part of the switch, since the sealing ring itself already has a very simple geometric shape on which a cutting burr can be attached without any problems.
  • the lower part can also be produced in a much simpler and more cost-effective manner.
  • the lower part can be produced, for example, as a stamped part.
  • the sealing ring together with the cutting burr arranged on it can also be produced as a stamped part.
  • the cutting burr is preferably designed to be closed on the circumference. This results in an even better sealing effect, because a self-contained seal in the form of an annular barrier is created when the new switch is installed.
  • the cover part can be made of electrically conductive material.
  • the insulating film then runs inside the switch between the lower part and the cover part and laterally between the circumferential wall of the lower part and the cover part and is with its edge area turned over on the top of the lid part. In this way, the cover part and the lower part are electrically isolated from one another.
  • the cover part consists of an electrically insulating material
  • the insulating film per se is not required, but it can nevertheless be provided in order to ensure a reliable sealing of the switch in the manner described above.
  • the insulating film then only has to be provided between the underside of the cover part and the lower part and does not have to extend onto the upper side of the cover part. It can therefore be designed like an insulating ring that rests on the lower part. In principle, however, the insulating film can then also be dispensed with entirely.
  • the cover part made of electrically insulating material can also rest with its underside directly on the lower part, so that in this case the cutting burr protrudes directly into the cover part from the underside.
  • the cutting burr provided on the sealing ring protrudes from an upper side of the sealing ring with a height which is between 10 ⁇ m and 50 ⁇ m, preferably 20 ⁇ m to 30 ⁇ m.
  • This height has proven itself because the insulating film usually used has a thickness in the range of less than 100 ⁇ m, so that the cutting burr penetrates into the insulating film up to a maximum of half this thickness, whereby the electrical insulating effect of the insulating film is maintained.
  • the cutting burr preferably has a width which is between 70% and 120% of the height of the cutting burr.
  • the cutting burr essentially has the shape of a triangle, particularly preferably the shape of an isosceles triangle, in cross section.
  • the sealing ring on which the cutting burr is formed is glued, soldered or welded to the lower part of the switch.
  • the sealing ring is inserted into the lower part together with the cutting burr arranged thereon and subsequently connected to it in a materially bonded manner by gluing, soldering or welding. This ensures a stable and tight connection between the sealing ring and the lower part of the housing. The production is therefore very easy.
  • the lower part has a circumferential wall, the upper section of which overlaps the cover part, and that a circumferential shoulder is provided in the lower part on which the cover part rests directly or indirectly, the upper section of the lower part on the cover part the circumferential shoulder presses.
  • This design variant is already from the DE 10 2015 144 248 B4 known. It has the advantage that no further components are required for fastening the cover part to the lower part.
  • the cover part is simply attached to the lower part by the upper part of the lower part which is bent over onto the cover part. The bent, upper edge of the lower part presses the cover part onto the circumferential shoulder provided in the lower part, on which the cover part rests either directly or indirectly (for example with the interposition of the insulating film).
  • the sealing ring with the cutting burr arranged thereon is preferably arranged in the area of the circumferential shoulder provided in the lower part. It can for example be arranged on, next to or in this shoulder.
  • a circumferential recess is provided in the circumferential shoulder, into which the sealing ring is crimped or pressed.
  • This depression is preferably designed as a groove-shaped depression in the circumferential shoulder.
  • the sealing ring together with the cutting burr arranged on it is inserted into this recess and fastened in it by flanging. It is also possible to provide a press fit so that the sealing ring is pressed into the recess. It arises a form-fitting and / or force-fitting connection by means of which the sealing ring including the cutting burr is held captive on the lower part of the switch housing.
  • sealing ring it is also possible not only to connect the sealing ring to the circumferential shoulder in a form-fitting or non-positive manner, but also to provide an integral connection between the two components, for example by means of gluing, soldering or welding.
  • the sealing ring is preferably designed as an inlay or insert that is inserted into the lower part and connected to it in a form-fitting, force-fitting and / or material fit.
  • the lower part in particular the circumferential shoulder of the lower part, is made of a material that has a higher hardness than a material from which the sealing ring is made.
  • a circumferential notch is provided in the lower part, and that the sealing ring has an annular bead or feather key on its underside facing the circumferential notch, which is fitted, pressed or crimped into the circumferential notch.
  • Such a form-fitting connection is similar to a tongue and groove connection. This guarantees stable mounting of the sealing ring on the lower part.
  • the sealing ring can be connected to the lower part in a materially bonded manner in order to further increase the mechanical stability of the connection.
  • the circumferential notch is preferably made in the circumferential shoulder in the lower part.
  • the insulating film is made of polyimide, preferably of an aromatic polyimide.
  • polyimide preferably of an aromatic polyimide.
  • Such protective films are known from the prior art. They are sold, for example, under the trade name Kapton®.
  • Kapton® Kapton®.
  • An insulating film made of this material is characterized by the fact that it is "pullable", that is to say that it stretches a little when the cover part is inserted into the lower part, and that it can still be easily folded around the face of the cover part on its upper side required dielectric strength is achieved.
  • the second outer contact surface is arranged on the upper section of the circumferential wall, with the switching mechanism then preferably carrying a movable contact part which cooperates with a stationary counter-contact which is arranged on the underside of the cover part and with one on the top arranged first outer contact surface cooperates.
  • the switching mechanism then preferably carrying a current transmission element which interacts with two stationary counter-contacts that are arranged on the underside of the cover part and with the two arranged on the top cooperate outer contact surfaces.
  • the switch can also be designed to switch and conduct very high currents, for which the two stationary mating contacts interact with a current transmission element in the form of a contact bridge or a contact plate, so that the operating current of the device to be protected does not flow through the spring Snap disk or even the bimetal snap disk, but only flows through the current transmission element.
  • the switching mechanism has a bimetal part.
  • the bimetal part can be a round, preferably circular bimetal snap disk, it also being possible to use an elongated bimetal spring clamped on one side as the bimetal part. With simple switches, the bimetal part can also be used to conduct electricity.
  • the switching mechanism additionally has a spring snap-action disk.
  • This spring snap disk can, for example, carry the movable contact part and lead the current through the closed switch and the closed state ensure the contact pressure. In this way, the bimetal part is relieved of both current conduction and mechanical stress when it is closed.
  • the switching mechanism has a current transmission element that interacts with two stationary mating contacts, either only one bimetal part can also be provided, which then provides the closing pressure and takes over the opening function, or a spring part can also be provided that applies the closing force so that the bimetal part is only mechanically loaded when it opens the switch.
  • the present invention is particularly suitable for at least approximately round temperature-dependent switches, which are round, circular or oval in plan view of the lower part or cover part, with other housing shapes also being able to use the invention if a self-contained cutting burr on the shoulder in the Lower part can be realized on which the cover part rests.
  • the sealing ring is preferably adapted to the shape of the switch. It is therefore preferably round, circular or oval when viewed from above.
  • Fig. 1 is shown in a schematic, sectional side view of a switch 10, which is rotationally symmetrical in plan view and preferably has a circular shape.
  • the switch 10 has a housing 12 in which a temperature-dependent switching mechanism 14 is arranged.
  • the housing 12 comprises a pot-like lower part 16 and a cover part 18 which is held on the lower part 16 by a bent or flanged edge 20.
  • the first embodiment shown is both the lower part 16 and the cover part 18 made of an electrically conductive material, preferably made of metal.
  • the cover part 18 rests on a shoulder 24 encircling the interior of the lower part 16 with an insulating film 22 in between.
  • the upper edge 20 of the lower part 16 is bent radially inward in such a way that it has the insulating film 22 lying between the cover part 18 presses on the circumferential shoulder 24 when it is opposite the in Fig. 1
  • the situation shown schematically is bent even further towards the top of the cover part 18.
  • the insulating film 22 ensures electrical insulation of the cover part 18 from the lower part 16.
  • the insulating film 22 also provides a mechanical seal that prevents liquids or contaminants from entering the interior of the housing from the outside.
  • the insulating film 22 runs inside the housing 12 parallel to the cover part 18 along the underside 25 thereof. From there, it is led laterally between the cover part 18 and the circumferential shoulder 24 up to over the top 23 of the cover part 18 out of the housing 12 .
  • the bent or beaded upper edge 20 of the lower part 16 lies flat on the upper edge region of the insulating film 22 and presses it in the direction of the upper side 23 of the cover part 18.
  • a further insulating cover 26 is provided on the upper side 23 of the cover part 18 and extends radially outward as far as the insulating film 22.
  • the switching mechanism 14 has a temperature-independent spring part 28 designed as a spring washer and a temperature-dependent snap part 30 designed as a bimetal snap disk.
  • the spring part 28 is preferably designed as a bistable spring washer.
  • the spring washer 28 accordingly has two temperature-independent stable geometric configurations. In Fig. 1 its first geometric configuration is shown.
  • the temperature-dependent bimetal snap disk 30 is preferably designed as a bistable snap disk.
  • the snap disk 30 has two temperature-dependent configurations, a high-temperature geometric configuration and a low-temperature geometric configuration.
  • the first switching position of the switching mechanism 14 shown is the snap-action disk 30 in its low-temperature configuration.
  • the spring washer 28 rests with its edge 32 on an inner bottom surface 34 of the lower part 16.
  • the inner bottom surface 34 is essentially concave and at the point where the edge 32 of the spring washer 28 in the FIG Fig. 1 first switching position shown rests, slightly increased compared to the central area of the inner bottom surface 34.
  • the snap disk 30 lies with its edge 36 in its in Fig. 1 shown low-temperature configuration on the spring washer 28.
  • the spring washer 28 With its center 38, the spring washer 28 is fixed on a movable contact member 40 of the switching mechanism 14.
  • the center 42 of the bimetallic snap disk 30 is also fixed on this contact member 40.
  • the temperature-dependent switching mechanism 14 is a captive unit of contact element 40, spring washer 28 and bimetallic snap disk 30.
  • the movable contact member 40 has a movable contact part 44 on its upper side.
  • the movable contact part 44 works together with a stationary mating contact 46, which is arranged on the underside 25 of the cover part 18.
  • the top 23 of the cover part 18, which is electrically conductively connected to the stationary mating contact 46, serves in this embodiment as a first outer contact surface 48.
  • the outside of the lower part 16 serves as a second outer contact surface 50 16 serve as a second outer contact surface 50.
  • the switch 10 Since the switch 10 is thus now open and the power supply to the device to be protected is interrupted, the device to be protected and thus also the switch 10 can cool down again.
  • the temperature inside the switch 10 then cools down again to a temperature below the switch-back temperature of the bimetal snap-action disk 30, it snaps out of its position again Fig. 2 high temperature configuration shown back in its in Fig. 1 Low temperature configuration shown.
  • the spring washer 28 also snaps back into its first geometrically stable configuration and brings the movable contact part 44 back into contact with the stationary mating contact 46. The switch 10 or the circuit is then closed again.
  • a sealing ring 52 is arranged in the area of the circumferential shoulder 24, on the upper side of which a cutting burr 54 is formed.
  • the cutting burr 54 is preferably designed as a circumferentially closed cutting burr which is integrally connected to the sealing ring 52.
  • Sealing ring 52 together with the cutting ridge 54 arranged thereon form a type of inlay which is inserted into the lower part 16 in the area of the circumferential shoulder 24.
  • the sealing ring 52 together with the cutting burr arranged thereon is preferably produced as a stamped part.
  • This stamped part is non-positive, positive and / or cohesive in the area the circumferential shoulder 24 (for example on, next to, below or in the circumferential shoulder 24) is connected to the lower part 16.
  • the lower part 16 and the sealing ring 52 can thus be produced as two separate components which are subsequently connected to one another. This enables a very simple production of both components, since both the lower part 16 and the sealing ring 52 with the cutting burr 54 arranged thereon can be produced as inexpensive stamped parts.
  • FIG. 3-5 three different exemplary embodiments are shown how the sealing ring 52 with the cutting burr 54 arranged thereon attaches to the lower part. 16 can be attached.
  • the sealing ring 52 is firmly bonded to the lower part 16.
  • the sealing ring 52 is glued, soldered or welded to the lower part 16 in the area of the shoulder 24.
  • the sealing ring 52 can be fitted into the lower part 16 in a type of press fit.
  • the connection between the sealing ring 52 and the lower part 16 is additionally stabilized.
  • the circumferential shoulder 24 or the lower part 16 is made of a material that has a higher hardness than the material from which the sealing ring 52 is made.
  • Fig. 4 shows a further embodiment in which the sealing ring 52 is arranged in a circumferential recess 56 which is introduced into the shoulder 24 of the lower part 16.
  • the circumferential recess 56 can be a groove-shaped recess which is introduced into the shoulder 24 from above and into which the sealing ring 52 can be pressed or crimped.
  • a circumferential notch 58 is provided in the lower part 16, into which a bead 62 arranged on the underside 60 of the sealing ring is fitted, pressed or crimped.
  • the notch 58 has in the Fig. 5 embodiment shown has a substantially V-shaped cross section.
  • the bead 62 has a substantially semicircular or U-shaped Cross-section. It goes without saying, however, that other cross-sectional shapes can also be provided for the notch 58 and the bead 62.
  • the cross-sectional shapes of the notch 58 and the bead 62 can also be configured to be equivalent to one another. In this case, however, it is preferred that the bead 62 is oversized with respect to the notch 58.
  • the cutting burr 54 is preferably at a height h (see Fig. 3 ) above the shoulder 24, which is between 10 ⁇ m and 50 ⁇ m.
  • the insulating film 22 typically has a thickness in the region of 100 ⁇ m. The cutting burr 54 thus cuts into the insulating film 22 to a maximum of 50% of its thickness. The electrically insulating properties of the insulating film 22 are therefore retained.
  • Fig. 6 and 7th show a second exemplary embodiment of the switch 10 according to the invention.
  • Fig. 6 shows the closed switch position of switch 10.
  • Fig. 7 shows the open switch position of switch 10.
  • the switch 10 according to the in Fig. 6 and 7th differs from that in FIG Fig. 1 and 2
  • the lower part 16 ' is again made of electrically conductive material.
  • the flat cover part 18 ′ is made here of electrically insulating material. Accordingly, no insulating film 22 is necessary here, which has to be inserted between the lower part 16 'and the cover part 18'.
  • the in Fig. 6 and 7th an insulating film 22 may be provided as shown in FIG Fig. 1 and 2 is shown. However, this would then only serve to mechanically seal the interior of the housing and not to electrically isolate the cover part 18 'from the lower part 16'.
  • a sealing ring 52 ' is arranged between the cover part 18' and the lower part 16 ', on the upper side of which a cutting burr 54' is arranged.
  • the cutting burr 54 ′ penetrates directly into the underside 25 of the cover part 18 ′. As before, it serves as a mechanical barrier that is intended to prevent contaminants from penetrating into the interior of the switch 10.
  • the cutting burr 54 ' is accordingly preferably designed here as a circumferential, closed cutting burr.
  • the sealing ring 52 ' is inserted into the lower part 16'. It rests with its underside on a shoulder 64 encircling the interior of the lower part 16 ′.
  • the sealing ring 52 'thus also acts at the same time as a spacer ring which keeps the upper part 18' at a distance from the lower part 16 '.
  • the sealing ring 52 ' is similar to that in FIG Fig. 1 and 2 shown first embodiment of the switch 10 according to the invention, non-positively, positively and / or cohesively connected to the lower part 16 '.
  • the sealing ring 52 ' can be glued, welded or soldered to the lower part 16', for example.
  • the fastening variants shown also apply equivalently to the fastening of the sealing ring 52 'to the lower part 16'.
  • the two outer contact surfaces 48 ', 50' are arranged on the top 23 of the cover part 18 '. These two outer contact surfaces 48 ', 50' are formed on the upper side of two rivets which are arranged at a distance from one another and which extend through the cover part 18 '.
  • a stationary contact 66, 68 is arranged on the underside of each rivet and projects downward from the underside 25 of the cover part 18 '.
  • the switching mechanism 14 ' is also designed somewhat differently here than before.
  • the movable contact member 40 ' comprises a current transmission member 70, which is designed as a contact plate, the upper side of which is coated in an electrically conductive manner, so that in the case of FIG Fig. 6 system shown on the stationary contacts 66, 68 ensures an electrically conductive connection between the two contacts 66, 68.
  • the current transmission element 70 is connected to the spring washer 28 and the bimetallic snap disk 30 via a rivet 72, which is also to be regarded as part of the contact element 40 ′.
  • the bimetal snap disk 30 snaps out of the in Fig. 6 low temperature configuration shown in their in Fig. 7
  • the current transmission member 70 is lifted from the two stationary contacts 66, 68 so that the circuit is interrupted.
  • the switch structure shown in the figure can be seen in the fact that, in contrast to the in Fig. 1-2 shown first embodiment of the switch 10 neither through the spring washer 28 nor through the bimetal snap disk 30 in the closed state of the switch 10, a current flows. This only flows from the first outer contact surface 48 'via the first stationary contact 66, the current transmission member 70 and the second stationary contact 68 to the second outer contact surface 50'.

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Thermally Actuated Switches (AREA)
EP20196508.4A 2019-09-20 2020-09-16 Commutateur dépendant de la température Active EP3796360B1 (fr)

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CN113561609B (zh) * 2021-07-21 2023-10-31 祐樘(南京)软件科技有限公司 生物医疗储藏箱保温绒布层贴覆系统及其贴覆方法

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EP3796360B1 (fr) 2021-11-17
DE102019125450A1 (de) 2021-03-25
US11282662B2 (en) 2022-03-22
DE102019125450B4 (de) 2021-04-08
CN112542349B (zh) 2024-02-13
DK3796360T3 (da) 2022-02-14
US20210090832A1 (en) 2021-03-25
CN112542349A (zh) 2021-03-23

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