EP3221879A1 - Disjoncteur comportant un élément bimétallique chauffé de manière passive et agissant sur une cheville à percussion d'un déclencheur électromagnétique - Google Patents

Disjoncteur comportant un élément bimétallique chauffé de manière passive et agissant sur une cheville à percussion d'un déclencheur électromagnétique

Info

Publication number
EP3221879A1
EP3221879A1 EP15797318.1A EP15797318A EP3221879A1 EP 3221879 A1 EP3221879 A1 EP 3221879A1 EP 15797318 A EP15797318 A EP 15797318A EP 3221879 A1 EP3221879 A1 EP 3221879A1
Authority
EP
European Patent Office
Prior art keywords
bimetallic element
circuit breaker
plunger
electromagnetic release
leaf spring
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
EP15797318.1A
Other languages
German (de)
English (en)
Other versions
EP3221879B1 (fr
Inventor
Matthias KATZENSTEINER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eaton Intelligent Power Ltd
Original Assignee
Eaton Industries Austria GmbH
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 Eaton Industries Austria GmbH filed Critical Eaton Industries Austria GmbH
Publication of EP3221879A1 publication Critical patent/EP3221879A1/fr
Application granted granted Critical
Publication of EP3221879B1 publication Critical patent/EP3221879B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2463—Electromagnetic mechanisms with plunger type armatures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/40—Combined electrothermal and electromagnetic mechanisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/40—Combined electrothermal and electromagnetic mechanisms
    • H01H71/402—Combined electrothermal and electromagnetic mechanisms in which the thermal mechanism influences the magnetic circuit of the electromagnetic mechanism
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/40—Combined electrothermal and electromagnetic mechanisms
    • H01H2071/407—Combined electrothermal and electromagnetic mechanisms the thermal element being heated by the coil of the electromagnetic mechanism

Definitions

  • the invention relates to a circuit breaker comprising at least two terminal contacts, which within the circuit breaker via a
  • Switching contact are electrically connected, acting on the switching contact electromagnetic release whose coil between the at least two
  • Connection contacts is connected, and acting on the switching contact bimetallic actuator respectively acting on the switching contact bimetallic element.
  • Circuit breakers are used to protect a line against excessive current load. Becomes a
  • the tripping in conventional circuit breakers can usually be done electromagnetically, by means of a bimetallic element, manually and in many cases also via an external connection.
  • the electromagnetic release is aimed primarily at the disconnection of the circuit at high overcurrent. Because the coil of the electromagnetic release of the circuit breaker is flowed through by the current, which also on the
  • the force generated by the electromagnetic release is dependent on the current. Above a certain threshold, the switching contact is opened by this force.
  • the electromagnetic release responds very quickly, whereby the delay time between the occurrence of an overcurrent and the opening of the switch contact is only very short.
  • the triggering via the bimetallic element takes place much slower and is intended above all to prevent excessively long-lasting current, which is only slightly above a set limit.
  • the bimetallic element is for this purpose in the electrical connection between the
  • the bimetallic element Connected terminal contacts of the circuit breaker and is therefore flowed through by the current flowing through the terminal contacts current.
  • the bimetallic element is gradually heated according to its electrical resistance and switches off after a delay time, which depends on the magnitude of the current. A higher overcurrent leads to an earlier shutdown, a lower current to a later shutdown.
  • the electromagnetic release or the bimetallic element can act directly or indirectly on the switching contact.
  • the electromagnetic release / the bimetallic element may in particular act on a lever system connected to the switching contact.
  • Ohmic resistance acts, a considerable power loss and thus leads to a poor efficiency of the circuit breaker.
  • An object of the invention is therefore to provide an improved circuit breaker.
  • a current load of the bimetallic element should be reduced or avoided and / or falling on the circuit breaker
  • Power loss can be reduced and / or the structure of a circuit breaker can be simplified.
  • the electromagnetic release comprises a movably mounted impact anchor respectively plunger and the bimetallic element acts directly or indirectly on this impact anchor / plunger.
  • the bimetallic element is passively heated, that is, heated only by the waste heat of the electromagnetic release.
  • the power loss at the circuit breaker can also be reduced.
  • the thermal and electromagnetic short-circuit release are combined spatially and functionally, ie they can form an assembly. This simplifies the construction of a circuit breaker.
  • the disclosed arrangement is particularly suitable for use in existing systems.
  • the switching contact or the lever system do not need to be changed, since the bimetallic element acts indirectly via the plunger on the switching contact / the lever system. From the perspective of
  • the thermal trip unit of a circuit breaker i.e., the bimetallic element
  • the thermal trip unit of a circuit breaker tends to be largely independent of the prior art
  • the "working temperature” ie the temperature at which the curvature of the bimetallic element is so large that the switching contact is opened, comparatively high (eg above 100 ° C) .
  • the bimetallic element should have a sufficient working capacity for the This means that the product of travel and force at the free end of the bimetallic element should be sufficiently large, for which there is sufficient distance between the working temperature and the circuit breaker
  • Reference temperature e.g., 20 ° C
  • Overload range is usually given a temperature that is sufficient as the working temperature for the bimetal. Furthermore, the heating power of said electromagnetic release is sufficient in most cases to the bimetallic To heat element and ensure safe triggering of the circuit breaker by the bimetallic element.
  • Coils for large rated currents have a low number of turns at large
  • electromagnetic release in particular spaced from the coil, is arranged.
  • a good electrical insulation between the electromagnetic release, in particular its coil, and the bimetallic element can be achieved.
  • a short circuit of the coil by the bimetallic element is thus avoided even if the insulation of the coil should be defective for some reason.
  • the bimetallic element and the electromagnetic release, in particular its coil are arranged directly adjacent in the circuit breaker. In this way, the bimetallic element can be well heated by thermal radiation.
  • the electromagnetic trigger in particular its coil
  • the bimetallic element in the relevant for the heat transfer by radiation zone no significant shielding by other components.
  • at least 90% of the radiation emitted by the electromagnetic release, in particular its coil, in this zone rays should impinge unhindered on the bimetallic element. This is 90% of the rays emitted by the electromagnetic release and due to the spatial position of the electromagnetic release and the bimetal element can meet each other in principle to the bimetallic element.
  • the bimetallic element is / are provided with a coating at least in the region of the thermal coupling with the electromagnetic release and / or the electromagnetic release at least in the region of the thermal coupling with the bimetal element, which is at least 90%.
  • the infrared radiation absorbs.
  • the bimetallic element and / or the electromagnetic release may be coated accordingly for this purpose.
  • the absorption capacity in the infrared range is relevant, in the visible wavelength range, the elements mentioned may well have a different color than black.
  • bimetallic element is arranged above the electromagnetic release, in particular above the coil, or one
  • Guiding device for directing hot air from the electromagnetic release is provided on the bimetallic element.
  • the bimetallic element can be well heated by convection. Warm air rising from the electromagnetic release sweeps around the bimetallic element and heats it. It is particularly advantageous in this case if a turbulent flow is generated, in particular by the shape of the electromagnetic release, its coil or the guide device.
  • the bimetallic element forms at least part of a yoke of the electromagnetic release.
  • the bimetallic element can in turn be heated by eddy currents, on the other hand, it forms part of the magnetic yoke of the electromagnetic release, resulting in a particularly strong synergistic effect.
  • This variant of the invention works particularly well when the bimetallic element has a comparatively high iron content.
  • eddy currents at a frequency of 50 Hz contribute only a comparatively small proportion to heating of the bimetallic element.
  • the coils are made of different thickness wire and have substantially the same diameter, in particular outer diameter. As a result, a series of circuit breakers with relatively few different types of its components can be constructed, since all coils have the same diameter (preferably the same outer diameter) and the components of the circuit breaker without larger
  • the differently thick coil wires are also wound on bobbin tubes with different diameters, so that within the series of circuit breakers result in coils with substantially the same outer diameter.
  • Heat transfer from the electromagnetic actuator to the bimetallic element within a series of circuit breakers having different thicknesses of coil wire is substantially the same.
  • Impact armature / plunger-acting leaf spring comprises, which is fixedly mounted at one end to the electromagnetic release and connected at the other end to the bimetallic element, in particular articulated and / or
  • the leaf spring acts on that end of the impact armature / plunger that faces away from the switching contact or the lever system.
  • the interface between the impact armature / plunger and the switching contact or the lever system can be kept simple.
  • such an arrangement can also be used for existing systems, since the said interface does not need to be changed.
  • the leaf spring rests on the impact armature / plunger only. This results in a simple construction of the circuit breaker.
  • the leaf spring / bimetallic element has forked ends into which a notch in the bimetallic element / in the leaf spring engages. As a result, a rotary joint between the leaf spring and the bimetallic element can be realized in a simple manner. It is also advantageous if the leaf spring / the plunger has a recess into which engages a notch in the plunger / in the leaf spring. As a result, a rotary joint between the leaf spring and the plunger can be realized in a simple manner.
  • the bimetallic element bends when heated to the electromagnetic release. This allows the bimetal element to press directly on the plunger of the electromagnetic release. In combination with a leaf spring also results in a progressive course of the force acting on the plunger force. Likewise, this results in a degressive course of the distance traveled by the plunger path relative to the path, which is covered by the free end of the bimetal element.
  • a compression spring acts on the impact armature / plunger whose force is directed away from the switching contact or the lever system. As a result, the impact armature / plunger is pulled away from the switching contact or the lever system, regardless of the leaf spring.
  • This variant is in particular advantageous if the leaf spring rests only on the impact armature / plunger but not connected / hooked with this.
  • the bimetal element acts indirectly on the iron contact or iron yoke of the electromagnetic release on the switching contact.
  • repercussions on the bimetallic element where they can occur when the bimetallic element acts on the plunger of the electromagnetic release, can be reduced, since influence on the electromagnetic release is also taken via the iron circuit or iron yoke.
  • the at least one bimetallic element is inserted into an iron or iron yoke of the electromagnetic release such that a magnetic flux through the iron / iron yoke in a first position of the at least one bimetallic element at a first temperature smaller is the magnetic flux through the iron circle / iron yoke in a second position of the at least one bimetallic element at a second temperature.
  • Trigger be influenced.
  • the bimetallic influence indirectly influences the switching contact via the electromagnetic release.
  • the force that must apply the bimetal element very low, since this acts essentially as a switch.
  • the bimetallic element can therefore be kept very small.
  • the circuit breaker comprises a variable in function of the temperature of the at least one bimetallic element air gap in the iron / iron yoke.
  • the magnetic flux in the iron circle / iron yoke of the electromagnetic release can be relatively strongly influenced, since the magnetic resistance formed by the air gap depends linearly on the size of the air gap.
  • Bimetallic element is changeable. This results in a comparatively simple construction of the electromagnetic release, since one end of the bimetal element can be fixedly connected to the iron circle / iron yoke.
  • Bimetallic elements are changeable. In this way, the influence of the bimetallic element can be enhanced.
  • Iron circle / iron yoke are inserted. With appropriate design, an emergency function of the electromagnetic release can be maintained even if a bimetallic element should fail for any reason.
  • the at least one bimetal element is arranged parallel to a direction of movement of a plunger of the electromagnetic release. This results in a particularly compact design of the
  • plastic tube having electromagnetic release arranged plastic tube.
  • the friction between the plastic tube and the inner leg, in the plastic pipe in particular also
  • Fig. 1 shows a first example of a triggering mechanism of a
  • Fig. 2 shows a second example of a triggering mechanism of a
  • Fig. 3 shows an example of a trigger mechanism in which a bimetallic element acts indirectly via a leaf spring on a plunger of an electromagnetic release
  • FIG. 4 shows the arrangement shown in FIG. 3 in a triggering state
  • Fig. 5 shows another example of a trigger mechanism in which a
  • Bimetallic element acts indirectly via a leaf spring on a plunger of an electromagnetic release
  • Fig. 6 is an exemplary leaf spring in plan view
  • Fig. 7 shows an exemplary bimetallic element in plan view
  • Fig. 8 shows an example of a trigger mechanism in which a bimetallic element, the iron or iron yoke of a
  • Electromagnetic trigger influenced.
  • Fig. 1 shows a first example of a triggering mechanism of a
  • a circuit breaker comprises at least two terminal contacts, which are electrically connected within the circuit breaker via a switching contact 1. Furthermore, the
  • Switching contact 1 acting electromagnetic release 2 the coil 3 is connected between the at least two terminal contacts and acting on the switching contact 1 bimetallic element. 4
  • the electromagnetic release 2 comprises not only the coil 3, a yoke 5 and a not visible in FIG. 1 because retracted impact anchor respectively plunger.
  • the bimetallic element 4 is fixed to a bimetallic support 6 and can be adjusted in its position (in FIG. 1 vertically) by means of a screw 7 which is guided by a nut 8 fixed to the housing.
  • the bimetallic support 6 is supported on the (in Fig. 1 only partially shown) housing 10 of the
  • Line circuit breaker 1 off, and is thus secured against rotation. In this way, the switching point or the triggering point of the bimetallic element 4 can be adjusted. Furthermore, the distance of the bimetallic element 4 to the electromagnetic release 2 can be adapted to coils 3 of different sizes. Although for different currents different sized wire cross sections of the coils 3 are required and the coils 3 may also have otherwise different dimensions, thereby
  • the switching contact 1 comprises a fixed fixed contact 1 1 and a movable contact piece 12, which is also part of a lever system 13.
  • the switching piece 12 is marked for reasons of clarity with small rings to better explain the function of the lever system 13 below to be able to.
  • the lever system 13 further comprises a contact piece carrier 14, which is rotatably mounted about a housing-fixed axis 15 and with points
  • the switching piece 12 is rotatably mounted about the arranged on the contact piece carrier 14 axis 16.
  • the lever system 13 comprises a pawl 17 which is rotatably mounted about an arranged on the contact piece carrier 14 axis 18 and is also marked with dots.
  • the lever system 13 comprises a latch support 19, which is rotatably mounted about the axis 15 and is characterized by small crosses.
  • the lever system 13 comprises a torsion spring 20, which presses the pawl 17 and the pawl support 19 against each other, and a tension spring 21, whose force acts on the contact piece 12.
  • Fig. 1 shows a bracket 24, which the pawl 17 with a lever of
  • Circuit breaker connects.
  • the function of the trigger mechanism shown in FIG. 1 is now as follows: In an ON position, the bimetallic element 4 is straight, so that the torsion spring 20 presses the pawl rest 19 on the pawl 17 and the pawl 17 with its extension in the Latch support 19 hooked. As a result, the contact piece carrier 14, the pawl 17 and the pawl support 19 can only be moved together, that is, rotated about the housing-fixed axis 15. The spring 21 pulls the switching piece 12 in a clockwise direction about the axis 16, whereby the switching contact 1 remains closed in the ON position.
  • the bracket 24 pulls the contact piece carrier 14, the pawl 17 and the pawl rest 19, which are hooked into one another, counterclockwise and thus causes the axis 16 to be moved to the right which is opened as a result of the switching contact 1.
  • the tripping of the circuit breaker can be effected by the electromagnetic release 2. If the current is too high, the impact armature presses on the latch support 19, so that the locking between the pawl 17 and the latch support 19 is released. The latch support 19 and the pawl 17 are then in the position shown in Fig. 1.
  • the bimetallic element 4 is heated by the waste heat of the electromagnetic release 2.
  • the electromagnetic release 2 whose main function is the detection of short-circuit currents and the opening of the switching contact 1 in the event of overcurrent, thus simultaneously acts as a heating coil. This results in a double use of the electromagnetic release 2.
  • the tripping mechanism of the circuit breaker illustrated in FIG. 1 has the following further features:
  • the bimetallic element 4 is spaced from the
  • electromagnetic release 2, in particular its coil 3, and the bimetallic element 4 can be achieved.
  • a short circuit of the coil 3 by the bimetallic element 4 is thus avoided even if the insulation of the coil 4 should be defective for some reason.
  • the bimetal element 4 and the electromagnetic release 2, in particular its coil 3, are arranged directly adjacent in the circuit breaker.
  • the bimetallic element 4 can be well heated by thermal radiation, because between the electromagnetic actuator 2, in particular its coil 3, and the bimetallic element 4 takes place in the relevant for the heat transfer by radiation zone no significant
  • the bimetal element 4 is oriented such that the heat transfer takes place on the largest possible area.
  • the bimetallic element 4 is provided with a coating at least in the region of the thermal coupling with the electromagnetic release 2 and / or the electromagnetic release 2, at least in the region of thermal coupling with the bimetallic element 4 / are, which absorbs at least 90% of the infrared radiation. In this way, the heat transfer by radiation from the electromagnetic release 2 to the bimetallic element 4 succeeds particularly well.
  • the bimetallic element 4 as shown in FIG. 1, is arranged above the electromagnetic release 2, in particular above the coil 3. In this way, the bimetallic element 4 is not only by
  • intermediate layer e.g., teflon, glass silk.
  • the bimetallic element 4 the electromagnetic release 2, in particular the coil 3, also touch, whereby the bimetallic element 4 is well heated by heat conduction.
  • the bimetal element 4 forms at least part of the yoke 5 of the electromagnetic release 2.
  • the yoke 5 can be moved past the top of the coil 3. This will make the bimetallic element
  • a layer of a bimetal element 4 is often made of magnetic steel anyway and can then simultaneously serve as part of the iron yoke or yoke 5 of the electromagnetic release 2.
  • Short-circuit currents are taken into account, and also that eddy currents at a frequency of 50 Hz, a comparatively small proportion to heat the
  • Bimetallic element 4 contribute.
  • FIG. 2 now shows a variant of a triggering mechanism of a
  • Circuit breaker which is very similar to the variant shown in FIG. In contrast, however, the coil 3 of the electromagnetic release 2 has a substantially larger cross-section than the coil 3 shown in FIG. 1 and is therefore suitable for a higher rated current. Moreover, that is
  • Bimetal element 4 in the front region bent down. In essence, that is Operation of the trigger mechanism shown in FIG. 2 but the same as for the trigger mechanism shown in FIG. 1.
  • Circuit breaker of a series of circuit breakers as shown in Figures 1 and 2 substantially the same diameter (here
  • Circuit breakers are constructed with relatively few different types of its components. Ideally, no need at all
  • Circuit breakers is substantially the same size, as shown in Figures 1 and 2. As a result, the heat transfer from the electromagnetic release 2 to the bimetallic element 4 within a series of
  • Circuit breakers with different thickness coil wire substantially the same.
  • the different thickness coil wires can be wound on bobbin tubes with different diameters, so that arise within the series of circuit breakers coil 3 with substantially the same outer diameter.
  • Another way to adapt the trigger mechanism to different sized coils 3, is also given by the fact that an exchangeable transmission piece can be provided, via which the bimetallic element 4 on the
  • the bimetallic element 4 curves towards the coil 3 when heated.
  • the trigger mechanism can also be constructed so that the bimetallic element 4 bends away when heated from the coil 3.
  • the bimetallic element 4 could be arranged in Figures 1 and 2 under the coil 3 and attack, for example, on a projection of the latch support 19.
  • the bimetal element 4 is in its (unheated) initial position very close to the coil 3. Bends the bimetallic element 4 when heated then down, the latch support 19 against the
  • the bimetallic element 4 can, as shown in Figures 1 and 2, actively apply a thermoelastic force for unlatching a trigger mechanism. Alternatively, it would also be possible that the bimetal element 4 is biased and holds the trigger mechanism in the ON state. If this force returns when the bimetallic element 4 is heated, the triggering mechanism is triggered, that is, the switching contact 1 is disconnected.
  • FIGS 3 and 4 now show an embodiment of a trigger mechanism of a circuit breaker, in which the bimetallic element 4 acts indirectly via the electromagnetic release 2 on the switching contact 1 respectively on a lever system connected to the switching contact.
  • the electromagnetic release 2 including the bimetallic element 4 acting thereon and the fixed contact 1 1 is shown.
  • the lever system with the switching piece which may be configured as that shown in Figures 1 and 2, is not shown.
  • the electromagnetic release 2 comprises a movably mounted
  • Impact anchor 25 respectively plunger on the bimetallic element 4 indirectly via a transverse to the direction of movement of the impact armature / plunger 25 arranged leaf spring 26 acts.
  • the leaf spring 26 is fixedly mounted at one end to the electromagnetic release 2 and at the other end with the bimetallic element 4th
  • the leaf spring 26 is at one end via a fixed
  • the electromagnetic release 2 comprises a first and second sleeve 27 and 28 of the magnetic circuit, which are made in particular of ferromagnetic material.
  • the preferably made of plastic impact armature / plunger 25 is slidably mounted in the first sleeve 27 and is by means of a compression spring 29 in the direction of the leaf spring 26 and thus independent of the leaf spring 26 of
  • the impact anchor / plunger 25 is further mounted in the second sleeve 28, which in turn is slidably mounted in the sleeve 30, which is preferably made of plastic. Furthermore, the electromagnetic release 2 comprises a fastening screw 31 for fastening the bimetallic element 4.
  • Figs. 3 and 4 The operation of the triggering mechanism shown in Figs. 3 and 4 is now as follows, with Fig. 3 showing the triggering mechanism in an idle state, Fig. 4 in the tripped state:
  • Impact armature / plunger 25 triggers the lever system, not shown, and thus the switching contact is disconnected. Supporting acts thereby, that the air gap between the two sleeves 27 and 28 thereby becoming ever narrower and thus the magnetic flux or the electromagnetic force are getting bigger. But the current through the coil 3 also leads to a heating of the bimetallic element 4, which bends against the force of the leaf spring 26 and against the force of the compression spring 29 to the outside. Characterized the leaf spring 26 is pulled into a more or less elongated shape and thus presses the impact armature / plunger 25 against the lever system, not shown. Also in this case, the ever narrowing air gap between the two sleeves 27 and 28 leads to an increase in the electromagnetic force.
  • the triggering of the circuit breaker thus depends both on the temperature of the bimetallic element 4 and the current through the coil 3.
  • the temperature of the bimetallic element 4 represents a temporal integral of the current through the coil 3, so that the influence of the bimetallic element 4 predominates in currents which are indeed long-lasting but only slightly above a permissible value. However, if the current rises very rapidly and very far above a permissible value, then the influence of the electromagnetic force on the impact armature / plunger 25 prevails.
  • Lever system 13 is turned away. This allows the interface between the
  • Impact armature / plunger 25 and the switch contact 1 and the lever system 13 are kept simple. In addition, such an arrangement can also be used for existing systems, since the said interface does not need to be changed.
  • the leaf spring 16 is only on the impact armature / plunger 25, resulting in a simple construction of the circuit breaker.
  • the leaf spring 26 may also have fork-shaped ends, in which a notch in the bimetallic element 4 engages (see also Fig. 6 and 7). This can easily pivot between the leaf spring 26 and the
  • Bimetallic element 4 can be realized. Of course, it is also conceivable for the same purpose that the bimetallic element 4 has fork-shaped ends, in which a notch in the leaf spring 26 engages. In this example, the bimetal element 4 bends when heated to the electromagnetic release 2 out. The combination with the leaf spring 26 results in a progressive course of the force acting on the plunger 25 force. Likewise, this results in a degressive course of the distance traveled by the plunger 25 path relative to the path, which is covered by the free end (or by the force acting on the leaf spring 26 end) of the bimetal element 4.
  • FIG. 5 now shows an embodiment which is similar to the embodiment shown in FIGS. 3 and 4. However, now the bimetallic element 4 is bent upwards in the initial state (shown in solid lines) and bends downwards when heated (drawn in broken lines). Accordingly, the leaf spring 26 is curved upon heating of the bimetallic element 4 forward and pushes the
  • the impact armature / plunger 25 is pulled away from the lever system 13 at low current solely by the leaf spring 26 until the impact armature / plunger 25 rests on a housing wall 10. Another spring is not provided, the use of which is not excluded.
  • the impact anchor / plunger 25 is mounted in the front region in the yoke 5, in the rear part in the plastic sleeve 30.
  • the illustrated arrangement further comprises an insulation 32.
  • the function of the triggering mechanism shown in FIG. 5 is similar to that of FIG.
  • the triggering of the circuit breaker depends both on the temperature of the bimetallic element 4 and the current through the coil 3.
  • the temperature of the bimetallic element 4 again represents a time integral of the current through the coil 3, which is why the influence of the bimetallic element 4 predominates in currents which, although long-lasting but only slightly above a permissible value.
  • the influence of the electromagnetic force on the impact armature / plunger 25 prevails, which pulls it in the direction of the yoke 5 or in the direction of the lever system 13.
  • Fig. 6 shows the leaf spring 26, Fig. 7, the bimetallic element 4 now in detail in plan view. Good to see are the recesses with which the two parts be hooked into each other. In this case, the fork-like extensions of the leaf spring 26 engage in the notches of the bimetallic element 4, whereby a kind of articulated connection is formed. Similarly, the leaf spring 26 is mounted in the lower region in the yoke 5. Of course, it is also conceivable for the same purpose that the bimetal element 4 has fork-shaped ends, in which a notch in the leaf spring 26 engages. Of course, the arrangement shown is not only applicable to the triggering mechanism shown in Fig. 5, but can also be applied to the triggering mechanism shown in Figs. 3 and 4.
  • the arrangement shown in FIG. 5 still has the following features:
  • the leaf spring 26 again acts on that end of the
  • Lever system 13 is turned away. This allows the interface between the
  • Impact armature / plunger 24 and the switch contact 1 and the lever system 13 in turn kept simple or even used for existing systems.
  • the leaf spring 26 is also connected / hooked to the impact armature / plunger 25. As a result, both tensile and compressive forces between the leaf spring 26 and the impact armature / plunger 25 can be transmitted.
  • the bimetallic element 4 moreover bends towards the electromagnetic release 2 upon heating.
  • this results in a progressive course of the force acting on the plunger 25 force.
  • this results in a degressive course of the distance traveled by the plunger 25 way relative to the path of the free end (or of the force acting on the leaf spring 26 end) of the
  • Bimetallic element 4 is covered.
  • FIG. 8 shows a further example of a triggering mechanism in which the bimetallic element 4 acts indirectly via the electromagnetic release 2 on a switching contact or on a lever system connected to the switching contact (shown here only symbolically) of the circuit breaker.
  • the bimetallic element 4 acts indirectly via the electromagnetic release 2 on a switching contact or on a lever system connected to the switching contact (shown here only symbolically) of the circuit breaker.
  • two bimetallic elements 4 are in such an iron or iron yoke 5 of the electromagnetic Trigger 2 inserted that a magnetic flux through the
  • Iron circle / iron yoke in a first position (shown in solid line) of the at least one bimetallic element 4 at a first temperature is less than the magnetic flux through the iron circle / iron yoke in a second position (dashed line) of the at least one bimetallic element 4 at a second temperature.
  • the electromagnetic release 2 comprises, in addition to a coil 3 and a centrally arranged and preferably made of plastic sleeve 30 two sleeves 27 and 28, a front disc 33 and a rear disc 24 which form parts of the iron / iron yoke.
  • the bimetal elements form 4 parts of the iron circle / iron yoke.
  • Iron circle / iron back is inserted / are.
  • the bimetallic elements 4 are in this example parallel to a direction of movement of the plunger 15 of the
  • the illustrated electromagnetic release 2 thus has air gaps in the iron circle / iron yoke, which are variable as a function of the temperature of the bimetallic element 4. From a certain temperature, the bimetallic elements 4 are so strongly curved that the air gaps are closed.
  • Iron circuit / iron yoke provided, which are variable depending on the temperature of said bimetallic element 4. It would also be conceivable that exactly one air gap per bimetallic element 4 in the iron circle / iron yoke is variable as a function of the temperature of said bimetallic element 4. For example, one end each of a bimetal element 4 could be fixedly connected to the disk 33 or the disk 34.
  • the temperature of the bimetallic elements 4 also influences the force acting on the impact armature / plunger 25.
  • the triggering of the circuit breaker thus depends both on the temperature of the bimetallic element 4 and the current through the coil 3.
  • the temperature of the bimetallic element 4 represents a time integral of the current through the coil 3, which is why the influence of the bimetallic element 4 predominates in currents which are indeed long-lasting but only slightly above a permissible value.
  • the influence of the electromagnetic force on the impact armature / plunger 25 prevails, which pulls it in the direction of the yoke 5 or in the direction of the lever system 13.
  • the first temperature which is associated with a larger air gap
  • the second temperature which is a smaller air gap
  • triggering mechanisms are suitable in which the bimetallic element 4 acts indirectly via the electromagnetic release 2 on a switching contact or on a lever system 13 of the circuit breaker connected to the switching contact (see in particular FIGS. 3 to 8), especially for use in existing systems ,
  • the lever system 13 does not need to be changed, since the bimetallic element 4, as shown above, acts indirectly on the lever system 13 via the plunger 4. From the perspective of the lever system 13, nothing changes with the use of such a triggering mechanism.
  • the triggering mechanisms shown in FIGS. 1 and 2 are mutatis mutandis applicable to the triggering mechanisms shown in FIGS. 3 to 8.
  • the bimetallic element 4 may be arranged at a distance from the electromagnetic release 2.
  • the bimetallic element 4 and the electromagnetic release 2 can also be arranged directly adjacent in the circuit breaker.
  • the bimetal element 4 is at least in the thermal coupling with the electromagnetic release 2 and / or the electromagnetic release 2 at least in the thermal coupling with the bimetallic element 4 is provided with a coating / which at least 90% of the infrared radiation absorbed. It is also possible that the bimetallic element 4 above the
  • electromagnetic initiator 2 is arranged or a guide device for conducting hot air from the electromagnetic release 2 is provided on the bimetallic element 4.
  • the bimetallic element 4 forms part of the yoke 5 of the electromagnetic release 2.
  • a series of multiple circuit breakers to form in which the coils 3 are made of different thickness wire and substantially the same diameter, in particular outer diameter, have (compare Figures 1 and 2).
  • the distance between the bimetallic element 4 and the electromagnetic release 2 in the case of several circuit breakers may be substantially the same.
  • the triggering device is not necessarily shown to scale and therefore may have other proportions. Furthermore, the triggering device may also comprise more or fewer components than shown. Location information (for example, “top”, “bottom”, “left”, “right”, etc.) are based on the respective figure described in each case and are to be adapted in a position change in accordance with the new situation. For example, the

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermally Actuated Switches (AREA)

Abstract

L'invention concerne un disjoncteur comportant au moins deux contacts de connexion connectés électriquement au moyen d'un contact de commutation (1) à l'intérieur du disjoncteur. Le disjoncteur comporte également un déclencheur électromagnétique (2) agissant sur le contact de commutation (1), dont la bobine (3) est montée entre les au moins deux contacts de connexion, ainsi qu'un élément bimétallique (4) agissant sur le contact de commutation (1). Sur le disjoncteur selon l'invention, la connexion électrique entre les au moins deux contacts de connexion s'étend à côté de l'élément bimétallique (4) et l'élément bimétallique est couplé thermiquement audit déclencheur électromagnétique (2). Le déclencheur électromagnétique (2) comporte par ailleurs une cheville à percussion ou un poussoir (25) logé mobile sur lequel l'élément bimétallique (4) agit directement ou indirectement.
EP15797318.1A 2014-11-20 2015-11-18 Disjoncteur comportant un élément bimétallique chauffé de manière passive et agissant sur une cheville à percussion d'un déclencheur électromagnétique Not-in-force EP3221879B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014117034.2A DE102014117034A1 (de) 2014-11-20 2014-11-20 Leitungsschutzschalter mit passiv beheiztem und auf einen Schlaganker eines elektromagnetischen Auslösers wirkendem Bimetall-Element
PCT/EP2015/077020 WO2016079206A1 (fr) 2014-11-20 2015-11-18 Disjoncteur comportant un élément bimétallique chauffé de manière passive et agissant sur une cheville à percussion d'un déclencheur électromagnétique

Publications (2)

Publication Number Publication Date
EP3221879A1 true EP3221879A1 (fr) 2017-09-27
EP3221879B1 EP3221879B1 (fr) 2019-05-01

Family

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EP15797318.1A Not-in-force EP3221879B1 (fr) 2014-11-20 2015-11-18 Disjoncteur comportant un élément bimétallique chauffé de manière passive et agissant sur une cheville à percussion d'un déclencheur électromagnétique

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Country Link
EP (1) EP3221879B1 (fr)
CN (1) CN107004546B (fr)
DE (1) DE102014117034A1 (fr)
WO (1) WO2016079206A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108054066B (zh) * 2017-12-15 2023-09-12 浙江正泰电器股份有限公司 断路器电磁脱扣器的冷弯转轴结构

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3013016A1 (de) * 1980-04-03 1981-10-08 Brown, Boveri & Cie Ag, 6800 Mannheim Ausloesesystem eines selbstschalters zur unterbrechung eines stromkreises
US4472696A (en) * 1982-12-27 1984-09-18 Gte Laboratories Incorporated Circuit breaker
DE3637275C1 (en) * 1986-11-03 1988-05-05 Flohr Peter Overcurrent trip device for protection switching apparatuses
NL8900007A (nl) * 1989-01-03 1990-08-01 Holec Syst & Componenten Stuurinrichting voor een elektrische schakelaar, alsmede een met deze stuurinrichting uitgeruste elektrische schakelaar.
DE19653295A1 (de) * 1996-12-20 1998-06-25 Abb Patent Gmbh Überstrom- und Kurzschlußauslöser für einen elektrischen Installationsschalter
DE19942694C2 (de) * 1999-09-07 2002-06-27 Eti Elektroelement Dd Auslöser für elektrische Schutzschalter
CA2579485A1 (fr) * 2004-11-22 2006-01-06 Abb Patent Gmbh Dispositif de commutation pourvu d'un declencheur electromagnetique
DE102012111618A1 (de) * 2012-11-29 2014-06-18 Eaton Industries (Austria) Gmbh Leitungsschutzschalter mit passiv beheiztem Bimetall-Element

Also Published As

Publication number Publication date
DE102014117034A1 (de) 2016-05-25
EP3221879B1 (fr) 2019-05-01
CN107004546B (zh) 2019-01-15
CN107004546A (zh) 2017-08-01
WO2016079206A1 (fr) 2016-05-26

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