EP3736845B1 - Temperaturabhängiger schalter - Google Patents

Temperaturabhängiger schalter Download PDF

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Publication number
EP3736845B1
EP3736845B1 EP20170813.8A EP20170813A EP3736845B1 EP 3736845 B1 EP3736845 B1 EP 3736845B1 EP 20170813 A EP20170813 A EP 20170813A EP 3736845 B1 EP3736845 B1 EP 3736845B1
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EP
European Patent Office
Prior art keywords
switch
temperature
transfer member
configuration
current transfer
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.)
Active
Application number
EP20170813.8A
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German (de)
English (en)
French (fr)
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EP3736845A1 (de
Inventor
Marcel P. Hofsaess
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Individual
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Individual
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Publication of EP3736845A1 publication Critical patent/EP3736845A1/de
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    • 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
    • H01H37/32—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
    • 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
    • H01H37/5409—Bistable switches; Resetting means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/60—Means for producing snap action
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/64—Contacts
    • 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
    • H01H9/20—Interlocking, locking, or latching mechanisms
    • 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
    • H01H2037/549—Details of movement transmission between bimetallic snap element and contact
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/64—Contacts
    • H01H37/70—Resetting means
    • H01H2037/705—Resetting means wherein the switch cannot be closed when the temperature is above a certain value
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/002—Thermally-actuated switches combined with protective means
    • 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

Definitions

  • the present invention relates to a temperature-dependent switch which has a first and a second stationary counter-contact and a temperature-dependent switching mechanism with a current transmission element, the switching mechanism either closing the switch depending on its temperature by pressing the current transmission element against the first and second counter-contact and an electrically conductive connection is established between the two mating contacts via the current transfer element, or it is opened by holding the current transfer element at a distance from the first and second mating contacts and thus interrupting the electrically conductive connection, with a locking device being provided which opens the switch holds when first opened.
  • Such a switch is from the DE 10 2013 101 392 A1 famous.
  • the known switch has a temperature-dependent switching mechanism with a temperature-dependent bimetal snap-action disk and a bistable spring disk which carries a movable counter-contact or a current transmission element in the form of a contact plate. If the bimetallic snap disk is heated to a temperature above its response temperature, it lifts the mating contact or the current transmission element against the force of the spring washer from the mating contact or contacts and thereby pushes the spring washer into its second stable configuration in which the switching mechanism is in its high-temperature position.
  • the known switch remains in its open position after it has been opened once, even if it cools down again.
  • tests in the applicant's company have shown that the known switch closes again in the event of strong mechanical vibrations, so that it may not be optimally usable from a safety point of view in some applications.
  • One from the DE 10 2007 042 188 B3 known switch has three switch positions. In its low temperature position, the switch is closed so that the two mating contacts are electrically connected to one another.
  • the switch In its high temperature position, the switch is open so that no current can flow through the switch. In its cooling position, the switch remains open, although the snap disk has cooled down again and has thus resumed its low-temperature configuration.
  • the temperature-dependent switch is a one-time switch that, after opening it once, remains open even when the temperature of the snap disk has decreased again.
  • Comparable one-time switches are from the DE 86 25 999 U1 as well as the DE 25 44 201 A famous.
  • Such temperature-dependent switches are used in a known manner to protect electrical devices from overheating.
  • the switch is electrically connected in series with the device to be protected and its supply voltage and mechanically arranged on the device in such a way that it is in thermal connection with it.
  • the two mating contacts are electrically connected to one another so that the circuit is closed and the load current of the device to be protected flows through the switch. If the temperature rises above a permissible value, the snap disk lifts the contact element against the actuating force of the spring washer from the mating contact, whereby the switch is opened and the load current of the device to be protected is interrupted.
  • the now de-energized device can then cool down again.
  • the switch that is thermally coupled to the device also cools down again and would then actually close again automatically.
  • the snap-action disk is a bistable snap-action disk which, depending on the temperature, assumes either a high-temperature configuration or a low-temperature configuration.
  • the spring washer is a circular spring washer to which a contact member is attached in the center.
  • the contact member is, for example, a movable contact part which is pressed by the spring washer against the first stationary mating contact which is arranged on the inside on a cover of the housing of the known switch.
  • the spring washer With its edge, the spring washer is pressed against an inner base of a lower part of the housing, which acts as a second mating contact.
  • the self-electrically conductive spring washer creates an electrically conductive connection between the two mating contacts.
  • the external connection of the known switch is made on the one hand via the outside of the electrically conductive lower part and on the other hand via a plated through-hole of the first stationary mating contact through the upper part on its outside, where, for example, a solder connection can be provided.
  • the bistable snap-action disk is a bimetallic snap-action disk that changes from its convex to concave configuration when its response temperature is exceeded.
  • the bimetal snap disk of the DE 10 2007 042 188 B3 known switch has centrally a through opening with which it is slipped over the movable contact part which is attached to the spring washer.
  • the bimetal snap disk In its low-temperature position, the bimetal snap disk lies loosely on the contact part. If the temperature of the bimetal snap disk increases, it jumps to its high temperature position, in which it presses itself with its edge on the inside of the upper part of the housing and thereby presses with its center on the spring washer so that it moves from its first to its second stable configuration jumps, whereby the movable contact part is lifted from the stationary mating contact and the switch is opened.
  • the bimetal snap-action disk jumps back to its low-temperature position. It comes with its edge in contact with the edge of the spring washer and with its center in contact with the upper part of the housing. However, the actuating force of the bimetal snap disk is not sufficient to allow the spring washer to jump back into its first configuration.
  • the one from the DE 10 2007 042 188 B3 Known switch remains open after a single opening until it has cooled to a temperature below room temperature, for which purpose a cold spray can be used, for example.
  • the known switch carries the load current of the device to be protected through the spring washer, which is only possible up to a certain current strength.
  • the spring washer heats up to such an extent that this self-heating leads to the switching temperature of the bimetal snap-action disk being reached before the device to be protected has actually reached its impermissible temperature.
  • the spring washer is fixed with its edge on the lower part of the housing, while the bimetal snap disk is provided between the spring washer and the inner bottom of the lower part.
  • the spring washer presses the contact plate against the two mating contacts. If the bimetal snap disk jumps to its high temperature position, its edge presses against the spring washer and its center pulls the spring washer away from the upper part, so that the contact plate is out of contact with the two mating contacts. So that this is geometrically possible, the contact plate, spring washer and bimetallic snap-action washer are captively connected to one another by a centrally running rivet.
  • this switch Due to its design, this switch therefore has a self-holding function. In the case of strong mechanical vibrations, however, in rare cases, the spring washer can also spring back unintentionally.
  • the contact bridge is in contact with a temperature-dependent switching mechanism via an actuating bolt, which consists of a bimetallic snap disk and a spring washer, both of which are clamped at their edge.
  • the spring washer and the bimetal snap disk are both bistable, the bimetal snap disk in a temperature-dependent manner and the spring washer in a temperature-independent manner.
  • the bimetal snap disk presses the spring washer into its second configuration, in which it presses the actuating bolt against the contact bridge and lifts it against the force of the closing spring from the stationary mating contacts.
  • this switch has the disadvantage that, in the open state, the spring washer counteracts the force of the contact bridge
  • the closing spring lifts off the mating contacts, so that the spring washer in its second configuration must reliably overcome the force of the closing spring.
  • the closing spring ensures that the contact bridge rests securely on the mating contacts in the closed state, a spring washer with very high stability is required in the second configuration.
  • a dome is formed on this spring tongue, which is pressed into its second configuration by a bimetal plate also fastened to the spring tongue, in which it spaces the movable contact part from the stationary mating contact.
  • the dome must hold the movable contact part at a distance from the fixed mating contact against the closing force of the spring tongue clamped in on one side, so that the dome in its second configuration has to apply a high actuating force.
  • the known switch thus has the disadvantages already discussed above, namely that high actuating forces have to be overcome, which leads to high production costs and an unsafe state in the cooling position.
  • a switch which, in an embodiment like that from the aforementioned DE 10 2013 101 392 A1 known switch has a contact plate which, however, is permanently mechanically locked here by the locking device when the switch has been opened for the first time.
  • the locking device comprises a first latching member on the edge of the contact plate and a second latching member which interacts therewith and which is arranged on an inside of a spacer ring. The assembly of this switch has proven to be problematic in some cases.
  • the pamphlet DE 10 2012 103279 B3 discloses a further temperature-dependent switch which corresponds to the preamble of claim 1.
  • the present invention is based on the object of developing the switch mentioned at the beginning in such a way that, with a structurally simple structure, it ensures a safe, permanent interruption of the circuit even in the event of strong vibrations.
  • the locking device mechanically permanently locks the current transmission element, the new switch cannot close again after it has been opened once, even if strong vibrations or temperature fluctuations occur.
  • the switch is consequently also mechanically locked, which is used synonymously in the context of the present application.
  • the locking lock is realized by the spring ring, which can be inserted without major problems during the assembly of the new switch and, if necessary, connected to the current transmission element.
  • the temperature-dependent switching mechanism contains a temperature-dependent snap element, preferably a bimetallic snap-action disk, which in the usual way causes the switching mechanism to open by lifting the current transmission element from the stationary counter-contact. According to the invention, the switch, once opened, is then locked in the open state.
  • the temperature-dependent switching mechanism can additionally have a bistable spring washer which, when the switch is closed, controls the closing force and thus the contact pressure between the movable current transmission element and the mating contacts causes. This relieves the mechanical load on the bimetal snap-action disk, which has a positive effect on its service life and the long-term stability of the response temperature.
  • the temperature-dependent switching mechanism comprises a temperature-dependent snap-action disk with a geometrical high-temperature configuration and a geometrical low-temperature configuration, as well as a bistable spring washer on which the current transmission element is arranged, the spring washer having two geometrical configurations that are stable regardless of temperature and in its first configuration that Current transmission member presses against the first and the second mating contact and, in its second configuration, pushes the current transmission member away from the first and the second mating contact.
  • the snap disk is supported with its edge on the inside of the switch during the transition from its low-temperature configuration to its high-temperature configuration and acts on the spring disk in such a way that it jumps around from its first to its second stable configuration, the snap disk being further preferred and the spring washers are fixed to the current transmission member via their respective centers.
  • the advantage here is that largely customary temperature-dependent switching mechanisms can be used for the new switch, so that the design effort for starting the series production of the new switch is low.
  • the snap disk is fixed to the current transmission member and a free space is provided for the edge of the snap disk, into which the edge protrudes at least partially when the snap disk resumes its low-temperature configuration with the spring disk in its second configuration.
  • the free space for the edge of the bimetal snap disk is provided in addition to the mechanical locking by the locking lock, there is initially no closing pressure that the locking lock has to absorb.
  • the switch remains open permanently.
  • the locking device only has to absorb the locking pressure in rare cases, which further increases the reliability of the new switch.
  • the switch comprises a housing on which the two mating contacts are provided and in which the switching mechanism is arranged.
  • the housing can be an individual housing of the switch or a pocket on the device to be protected from overheating.
  • the fixing of the spring washer with its edge on the housing ensures that the current transmission member remains securely positioned with respect to the mating contacts.
  • the housing has a lower part closed by an upper part, the two mating contacts being arranged on an inner side of the upper part.
  • the lower part has an inner base, over the edge area of which a free space is provided for the edge of the snap disk.
  • This measure is particularly advantageous from a constructional point of view, because it enables a known temperature-dependent switch to be provided with the three switching positions mentioned at the outset in the simplest possible manner, if a bistable spring part with two temperature-independent stable configurations is used there in each case.
  • the new switch is not only easy to manufacture, it also remains securely open in its cooling position.
  • the lower part can be made of electrically conductive material and preferably the upper part of electrically insulating material, wherein the bistable snap disk can be a bi- or tri-metal snap disk.
  • the spring ring cooperates with the current transmission member and a spacer ring arranged between the upper part and the lower part, the spring ring preferably being arranged on the one hand between the spacer ring and the upper part and having at least one locking member which cooperates with the current transmission member.
  • Such spacer rings are often inserted between the lower part and the upper part in temperature-dependent switches in order to achieve the required overall height, which enables a sufficiently large switching path between the mating contact and the contact member to ensure the necessary electrical insulation in the open switch.
  • the simple assembly is an advantage, because after the insertion of the spacer ring, which is required anyway when assembling the switch, the spring ring is placed next, which is then fixed by the upper part placed afterwards together with the spacer ring and the switching mechanism. In order not to change the switching path and the overall height of the switch, it may be necessary to shorten the spacer ring a little.
  • the locking member has a radially inwardly resilient tongue which rests under tension on an edge of the current transmission member when the switch is closed and is supported on the current transmission member when the switch is open.
  • an assembly aid for example a spreader tool, so that the or each tongue can thread between the radially outwardly facing edge of the current transmission element and the spacer ring during assembly of the switching mechanism located in the low temperature position.
  • the or each radially inwardly resilient tongue is thus located between the spacer ring and the current transmission member when the switch is closed.
  • the switch opens, the current transmission member moves downwards and the or each resilient tongue comes free from its edge and moves further radially inward over the current transmission member, which is thus permanently mechanically locked by the or each tongue and consequently prevented from moving again to move upwards in contact with the two mating contacts, even when the switching mechanism cools down again and the spring washer is snapped back into its first configuration.
  • the spring washer is arranged on the current transmission member and has at least one locking member that interacts with the spacer ring, the locking member preferably having a radially outwardly resilient tongue that rests under tension on an inner surface of the spacer ring when the switch is closed, and is supported on a recess in the spacer ring when the switch is open.
  • the spacer ring is inserted next.
  • the spring ring is then placed on the current transmission member, the outwardly resilient tongues being moved radially inward by contact with the inner surface of the spacer ring.
  • the or each radially outwardly resilient tongue thus rests against an inner surface of the spacer ring when the switch is closed.
  • the current transmission member moves downwards and the or each resilient tongue comes free from the inner surface and radially further outwards into the recess in the spacer ring, whereby the current transmission member is permanently mechanically locked.
  • the current transmission member connected to the spring washer is thus mechanically prevented by the or each tongue from moving upwards again into contact with the two mating contacts, even if the switching mechanism cools down again and the spring washer is snapped back into its first configuration.
  • Fig. 1 is shown in a schematic, sectional side view of a switch 10, which is formed rotationally symmetrical in plan view, preferably has a circular shape.
  • the switch 10 has a housing 11 in which a temperature-dependent switching mechanism 12 is provided.
  • the housing 11 comprises a pot-like lower part 14 made of electrically conductive material and a flat, insulating upper part 15, which is held on the lower part 14 by a bent edge 16.
  • a bent edge 16 For the sake of clarity, the one is bent over Edge 16 is not shown drawn across the upper part 15 and bent down completely onto the upper part 15.
  • a spacer ring 17 is provided between the upper part 15 and the lower part 14 and keeps the upper part 15 at a distance from the lower part 14.
  • the upper part 15 has an inner side 18 on which a first stationary mating contact 19 and a second stationary mating contact 21 are provided.
  • the mating contacts 19 and 21 are designed as rivets which extend through the upper part 15 and end on the outside in heads 22 and 23, respectively, which are used for the external connection of the switch.
  • the switching mechanism 12 further comprises a current transmission element 24 which, in the exemplary embodiment shown, is a contact plate, the upper side 25 of which is partially coated in an electrically conductive manner, so that it can be used in the case of FIG Fig. 1 System shown on the mating contacts 19 and 21 ensures an electrically conductive connection between the two mating contacts 19 and 21.
  • a current transmission element 24 which, in the exemplary embodiment shown, is a contact plate, the upper side 25 of which is partially coated in an electrically conductive manner, so that it can be used in the case of FIG Fig. 1 System shown on the mating contacts 19 and 21 ensures an electrically conductive connection between the two mating contacts 19 and 21.
  • the components made of solid material here the spacer ring 17 and the contact plate 24, are not hatched, although they are also shown in section.
  • the current transmission member 24 is connected to a bistable spring washer 27 and a bistable snap disk 28 via a rivet 26, which is also to be regarded as part of the contact plate.
  • the spring washer 27 has two temperature-independent configurations, of which the first configuration in FIG Fig. 1 (closed switch 10) and the second configuration in Fig. 2 (open switch 10) is shown.
  • the snap disk 28 has two temperature-dependent configurations, namely its cryogenic configuration, which is shown in FIG Fig. 1 (closed switch 10), as well as its high temperature configuration shown in FIG Fig. 2 (open switch 10) is shown.
  • a circumferential shoulder 29 on which the spacer ring 17 rests is provided inside the lower part 14.
  • the edge 31 of the spring washer 27 is clamped between the shoulder 29 and the spacer ring 17, while its center 32 rests on a shoulder 33 on the rivet 26.
  • the spring washer 27 is thus clamped between the current transmission member 24 and the shoulder 33 at its center 32.
  • a shoulder 34 can be seen on the rivet 26, on which the snap disk 28 rests with its center 35.
  • the center 35 rests freely on the shoulder 34. With its edge 36, the snap disk 28 is also exposed, that is to say without mechanical stress, on an inner base 37 of the lower part 14.
  • the inner bottom 37 is designed as a wedge-shaped, radially outwardly rising support shoulder 38 which, as in the case of the DE 10 2011 016 142 A1 known switch as a support surface for the edge 36 is used.
  • the snap disk 28 snaps again from its high-temperature configuration Fig. 2 back to their low-temperature configuration that they were already in Fig. 1 had taken.
  • the snap disk 28 is again in its low-temperature configuration to which it has cooled as a result of the cooling of the device to be protected.
  • the edge 36 of the snap disk 28 will move downwards so that it comes to rest on the support shoulder 38, which is shown in FIG Fig. 1 is provided.
  • the snap disk 28 will therefore push the spring disk 27 back into its first configuration, as is the case with the switch according to FIG DE 10 2011 016 142 A1 the case is.
  • a circumferential free space 40 is provided below the edge 36 of the snap disk 28 and is provided in an edge region 41 of the inner bottom 37.
  • the switch 10 off Fig. 2 thus remains open even when the snap disk 28 has moved back into its low-temperature configuration. However, vibrations can cause the switch 10 to turn off Fig. 2 but closes again, which is undesirable with single-use switches.
  • a locking device 39 is provided, which in the area of the Fig. 1 and 2 indicated circles I and II is arranged.
  • exemplary embodiments of the locking devices 39 are not shown in FIG Fig. 1 and 2 but in the Figures 3 to 8 shown.
  • the task of the locking barriers 39 is to permanently and mechanically lock the temperature-dependent switching mechanism 12 in a switch 10 that has been opened, so that the switch 10 cannot close again even when the snap disk 28 has cooled down.
  • the locks 39 each include a spring ring 43, 51, as shown in FIG Fig. 3 in a first and in Fig. 4 is shown schematically and not to scale in a second embodiment.
  • the spring ring 43 is in Fig. 3 shown above in plan view. It has an annular surface 44, with the inside 45 of which three resilient tongues 46 are formed in one piece.
  • the spring ring 43 is punched out of spring steel and is initially as shown in FIG Fig. 3 shown above, namely with tongues 46 lying in the plane of the ring.
  • the tongues 46 are then bent upwards by approx. 85 °, as shown in the sectional side view in FIG Fig. 3 can be seen below. If the tongues 46 are now bent further outward during assembly, they spring radially inward in the direction of arrow 47.
  • the spring ring 51 is in Fig. 4 shown above in plan view. It has an annular surface 52, with the outside 53 of which three resilient tongues 54 are formed in one piece.
  • the spring ring 51 is punched out of spring steel and is initially as shown in FIG Fig. 4 shown above, namely with tongues 54 lying in the plane of the ring.
  • the tongues 54 are then bent upwards by approx. 85 °, as shown in the sectional side view in FIG Fig. 4 can be seen below. If the tongues 54 are now bent further inward during assembly, they spring radially outward in the direction of arrow 55.
  • Fig. 5 shows an enlarged representation of the in Fig. 1 with I designated section of the closed switch 10.
  • the spring ring 43 from Fig. 3 rests with its annular surface 44 on top of the spacer ring 17 and is clamped between this and the upper part 15 and thus fixed.
  • the tongues 46 lie in a gap 57 between the spacer ring 17 and a radially outwardly facing edge 58 of the current transmission member 24.
  • the tongues 46 were bent radially outward during assembly and extend at almost 90 ° to the annular surface 44, so that they are resiliently biased radially inward and rest against the edge 58, which is indicated by the arrow 47.
  • Fig. 6 shows an enlarged Representation of the in Fig. 2 with I designated section of the closed switch 10.
  • the tongues 46 come free from its edge 58, move radially inward and thus pass over the current transmission member 24, which they permanently mechanically lock by contacting its upper side 59. In the area in which the tongues 46 rest on the upper side 59, this is preferably not electrically conductive.
  • the current transmission member 24 is consequently prevented from moving upwards again into contact with the two counter-contacts 19, 21, even if the switching mechanism 12 cools down again and the spring washer 27 is snapped back into its first configuration.
  • Fig. 7 shows an enlarged representation of the in Fig. 1 with I designated section of the closed switch 10.
  • the spring ring 51 from Fig. 4 rests with its annular surface 52 on the upper side 59 of the current transmission member 24 and is suitably fixed there, for example by gluing or soldering. In the area in which the spring ring 51 rests on the upper side 59, this is preferably not electrically conductive.
  • the tongues 54 rest on a radially inwardly facing inner surface 61 of the spacer ring 17.
  • the tongues 54 were bent radially inward during assembly through contact with the spacer ring 24 and extend at almost 90 ° to the ring surface 52, so that they rest against the inner surface 61 in a radially outwardly resilient manner. which is indicated by the arrow 51.
  • the assembly is carried out in such a way that first the switching mechanism 12 is inserted into the lower part 14 and then the spacer ring 17. The spring ring is then pushed into the spacer ring 17 until it rests on the upper side 59 of the current transmission member 24. The spring ring 51 is then fixed on the upper side 59.
  • Fig. 8 shows an enlarged representation of the in Fig. 2 with I designated section of the closed switch 10.
  • the tongues 54 come free from the inner surface 61, move radially outward and enter the radially outwardly recessed recess 62 in the spacer ring 17 located below the inner surface 61.
  • the current transmission member 24 is permanently mechanically locked by the contact of the tongues 54 in the recess 62.
  • the current transmission member 24 is consequently prevented from moving upwards again into contact with the two counter-contacts 19, 21, even if the switching mechanism 12 cools down again and the spring washer 27 is snapped back into its first configuration.
  • the spring ring 51 can also be fastened to the current transmission member 24 by means of clips 63 which are arranged on the spring ring 51 and which encompass the current transmission member 24. This type of fixation takes place when the spring ring 51 is pushed in and saves the subsequent fixing by gluing or soldering.

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Thermally Actuated Switches (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
EP20170813.8A 2019-05-09 2020-04-22 Temperaturabhängiger schalter Active EP3736845B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019112074.8A DE102019112074B4 (de) 2019-05-09 2019-05-09 Temperaturabhängiger Schalter

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ES (1) ES2895702T3 (zh)

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DE102019128367B4 (de) 2019-10-21 2021-06-10 Marcel P. HOFSAESS Temperaturabhängiger schalter
DE102023104807B3 (de) 2023-02-28 2024-05-16 Marcel P. HOFSAESS Temperaturabhängiger Schalter

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US11217409B2 (en) 2022-01-04
DE102019112074B4 (de) 2020-12-17
EP3736845A1 (de) 2020-11-11
CN111916307B (zh) 2023-03-28
CN111916307A (zh) 2020-11-10
ES2895702T3 (es) 2022-02-22
DK3736845T3 (da) 2021-11-08
US20200357589A1 (en) 2020-11-12
DE102019112074A1 (de) 2020-11-12

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