CN220672497U - Circuit breaker - Google Patents

Abstract

The application discloses a circuit breaker, which comprises an operating mechanism, a magnetic release, a controller and a main loop conductor; the main loop conductor comprises a moving contact and a fixed contact, and the operating mechanism is used for driving the moving contact and the fixed contact to contact and separate so as to realize the connection and disconnection of the circuit breaker; the magnetic release is driven by the controller and then triggers a traction rod of the operating mechanism, so that the operating mechanism is switched from the closing state to the opening state; the device also comprises a trigger switch assembly and a temperature sensing element; the trigger switch assembly is electrically connected with the controller, the controller is electrically connected with the magnetic release, and the controller drives the magnetic release to work after the trigger switch assembly is triggered; the temperature sensing element is used for sensing heat of the main loop conductor, and the trigger switch assembly is triggered by deformation of the temperature sensing element after overload of the main loop occurs; the application has the characteristics of heat memory like function and the like.

Description

Circuit breaker

Technical Field

The application relates to the field of low-voltage electrical switches, in particular to a circuit breaker.

Background

The plastic shell type circuit breaker is used as a common low-voltage power distribution switch and is commonly applied to various occasions.

The existing molded case circuit breakers are divided into thermomagnetic molded case circuit breakers and electronic molded case circuit breakers according to different tripping modes.

For an electronic molded case circuit breaker, the overload protection is realized through the following components, a mutual inductor, a controller, a release and an operating mechanism, wherein the mutual inductor is used for detecting current information of a main loop, the controller is used for judging whether the current information accords with an overload condition, and the release is triggered to drive the operating mechanism to execute a brake opening operation if the current information accords with the overload condition.

For example, CN209544275U is just applied to this kind of structure, this kind of electronic molded case circuit breaker is based on mutual inductor sampling current information, and the chip of controller judges again (therefore whether the period of overload exists is basically invariable for each time discernment), so this kind of electronic molded case circuit breaker does not have the thermal memory function, though the thermal memory function uses comparatively more in the frame circuit breaker, but conventional thermal memory function uses a large amount of electronic components, for the frame circuit breaker its controller possesses enough space setting corresponding components, but for the molded case circuit breaker this kind of customer has very much difficulty to the product that the product volume requirement is comparatively high.

Therefore, how to design a novel overload protection structure to achieve the above functions is a research direction.

Disclosure of Invention

In view of this, the purpose of this application is to overcome the shortcoming in prior art, aims at providing a circuit breaker, has characteristics such as thermal memory's function.

The application provides a circuit breaker, which comprises an operating mechanism, a magnetic release, a controller and a main loop conductor; the main loop conductor comprises a moving contact and a fixed contact, and the operating mechanism is used for driving the moving contact and the fixed contact to contact and separate so as to realize the connection and disconnection of the circuit breaker; the magnetic release is driven by the controller and then triggers a traction rod of the operating mechanism, so that the operating mechanism is switched from the closing state to the opening state; the device also comprises a trigger switch assembly and a temperature sensing element; the trigger switch assembly is electrically connected with the controller, the controller is electrically connected with the magnetic release, and the controller drives the magnetic release to work after the trigger switch assembly is triggered; the temperature sensing element is used for sensing heat of the main loop conductor, and the trigger switch assembly is triggered by deformation of the temperature sensing element after overload of the main loop occurs.

Compared with the traditional electronic circuit breaker, the structure changes the identification structure of overload situation which is detected by using a transformer and identified and judged by using a controller in the prior art into the identification structure which is used for triggering a trigger switch assembly to realize the identification of the overload situation by using the heated bending of a temperature sensing element, so that after the last overload is cleared, a certain time is required for the temperature sensing element to recover to the original state (the temperature sensing element also has waste heat), if overload occurs again, the temperature sensing element can recover to a deformation state more quickly, the process of identifying the overload is more quick, and the structure has a thermal memory function which is equivalent to a function of having thermal memory.

In some embodiments of the present application, the temperature sensing element is a double or triple gold or shape memory alloy.

The temperature sensing element adopts double-gold, triple-gold and shape memory alloy, so that when the main loop is overloaded, the temperature sensing element is heated to deform, and the trigger switch assembly is triggered.

In some embodiments of the present application, the shape of the temperature sensing element is straight in an initial state, and is curved after deformation; or the shape of the temperature sensing element is curved in an initial state and is flat after deformation; or the shape of the temperature sensing element is in a first bending shape in an initial state, and is in a second bending shape after deformation, wherein the bending degree of the first bending shape is larger than that of the second bending shape; or the shape of the temperature sensing element is in a first bending shape in an initial state, and is in a second bending shape after deformation, and the bending degree of the second bending shape is larger than that of the first bending shape.

With this structure, the temperature sensing element is ensured to be in the first shape (the first shape can be straight or bent) when not heated, and the temperature sensing element is deformed into the second shape after being heated so as to trigger the trigger switch assembly.

In some embodiments of the present application, the temperature sensing element is at least partially affixed to the main loop conductor.

With this structure, the temperature sensing element is in contact with the main loop conductor, and the heating of the temperature sensing element is realized by heat conduction, and this structure is also called as a bypass type structure.

In some embodiments of the present application, the temperature sensing element is secured at one end to the circuit breaker housing or at one end to the main loop conductor.

By adopting the structure, one end of the temperature sensing element is fixed, which is beneficial for the deformation of the temperature sensing element in a preset range.

In some embodiments of the present application, the main loop conductor includes a first conductor and a second conductor, the temperature sensing element is electrically connected between the first conductor and the second conductor, and at least one of two ends of the temperature sensing element is electrically connected through a soft connection or a soft conductive braid or a soft wire.

With this structure, the temperature sensing element is a part of the main loop conductor, and the temperature sensing element can be heated directly due to the abnormal current in the main loop, and this structure is also called a direct heating type structure. At least one end of the temperature sensing element is connected through soft connection or soft conductive braid or soft wire, and the connection is favorable for deformation of the temperature sensing element.

In some embodiments of the present application, the trigger switch assembly is a micro switch, the micro switch is located in a deformation direction of the temperature sensing element, and the temperature sensing element triggers a button or a lever of the micro switch in a pushing manner; or the trigger switch component is a micro switch, the micro switch is positioned in the opposite direction of the deformation direction of the temperature sensing element, and the temperature sensing element triggers the micro switch in a pulling mode.

By adopting the structure, the trigger switch component is a micro switch, and the micro switch can be triggered in a pushing or pulling mode as long as the micro switch can be arranged beside the temperature sensing element. Meanwhile, the micro switch can be provided with or without a lever, when the micro switch is provided with the lever, the temperature sensing element directly acts on a button of the micro switch, and when the micro switch is provided with the lever, the temperature sensing element indirectly presses the button through acting on the lever.

In some embodiments of the present application, the trigger switch assembly is a hall switch assembly, and the temperature sensing element triggers the hall switch assembly to generate a signal to the controller after deformation; or the trigger switch component is a photoelectric detection switch, and the temperature sensing element triggers the photoelectric detection switch after being deformed due to overload of the main loop.

By adopting the structure, the trigger switch component can use the Hall switch component, the photoelectric detection switch and other position induction switches, and can also realize the identification of the deformation of the temperature sensing element and feed the deformation back to the controller.

In some embodiments of the present application, the temperature sensing element further comprises a linkage component, wherein the linkage component and the temperature sensing element are integrally formed, and the component is used for triggering the switch assembly after the temperature sensing element is deformed; or, the temperature sensing element also comprises a linkage part, wherein the linkage part is fixed on the temperature sensing element and is used for triggering the switch assembly after the temperature sensing element is deformed; or, the circuit breaker also comprises a linkage part, the linkage part is arranged on the bracket in a sliding or rotating mode, the temperature sensing element is deformed to trigger the linkage part to slide or rotate, so that the movement of the temperature sensing element triggers the trigger switch assembly, and the bracket is a part of the circuit breaker shell or a part fixed on the circuit breaker shell.

By adopting the structure, the temperature sensing element can directly drive the trigger switch assembly, and also can drive the trigger switch assembly in an indirect mode, the product structure of the direct driving mode is more simplified, and the indirect driving mode enables the position design space of the temperature sensing element and the trigger switch assembly to be more diversified.

In some embodiments of the present application, at least two pole main loop conductors are included, each pole main loop conductor having a trigger switch assembly and a temperature sensing element disposed thereon.

By adopting the structure, the identification component for overload protection is arranged on each pole of the main loop conductor, so that the overload protection can be quickly tripped to protect the load when any pole is overloaded.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 shows a perspective view of a circuit breaker of embodiment 1 of the present application;

fig. 2 is a schematic diagram showing an internal structure of a circuit breaker according to embodiment 1 of the present application;

FIG. 3 is a diagram showing the relationship between the temperature sensing element and the trigger switch assembly of the bypass type embodiment of example 1 of the present application;

FIG. 4 is a diagram showing the relationship between the temperature sensing element and the trigger switch assembly of the direct heating embodiment of example 1 of the present application;

FIG. 5 is a schematic diagram showing the structure of a trigger switch assembly of the embodiment of the Hall switch assembly in embodiment 1 of the present application;

FIG. 6 is a schematic diagram showing the structure of a trigger switch assembly of the embodiment of the photoelectric detection switch in embodiment 1 of the present application;

fig. 7 is a schematic structural diagram showing another positional relationship between the temperature sensing element and the trigger switch assembly in embodiment 1 of the present application;

fig. 8 to fig. 9 are structural diagrams showing a triggering manner of the temperature sensing element and the trigger switch assembly in embodiment 1 of the present application;

FIGS. 10-11 are structural diagrams showing another triggering mode of the temperature sensing element and the trigger switch assembly in embodiment 1 of the present application;

fig. 12-15 illustrate various embodiments of the initial state shape and the deformed state shape of the temperature sensing element in example 1 of the present application.

Description of the embodiments

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In order to solve the problem that the electronic molded case circuit breaker in the prior art does not have a thermal memory function, the circuit breaker is adopted and comprises an operating mechanism, a magnetic release, a controller and a main loop conductor; the magnetic release is driven by the controller and then triggers the operating mechanism to execute the opening operation; the device also comprises a trigger switch assembly and a temperature sensing element; the trigger switch assembly is electrically connected with the controller, the controller is electrically connected with the magnetic release, and the controller drives the magnetic release to work after the trigger switch assembly is triggered; the temperature sensing element is used for sensing heat of the main loop conductor, and the trigger switch assembly is triggered by deformation of the temperature sensing element after overload of the main loop occurs.

By adopting the structure, the induction element which can induce the main loop conductor to generate heat and deform can be applied to the thermal tripping structure, and the trigger switch component which can be triggered by the deformation of the induction element and can give a signal to the controller can also be applied to the thermal tripping structure. Compared with the traditional electronic circuit breaker, the structure is realized by utilizing the temperature sensing element to be heated and bent to trigger the trigger switch assembly, so that a certain time is needed for the temperature sensing element to restore to the original state after the previous overload is cleared (waste heat is also on the temperature sensing element), and the overload can be restored to the deformation state more quickly if the overload occurs again, so that the process of identifying the overload is quicker, and the structure has a thermal memory function which is equivalent to a thermal memory function. Meanwhile, compared with a tripping structure of the thermo-magnetic molded case circuit breaker, the structure also has the following functions: the magnetic release is utilized to push the traction rod of the operating mechanism to realize release, the magnetic release does not obstruct the closing operation of the traction rod after releasing, and meanwhile, the temperature sensing element does not directly act on the traction rod, so that the condition that the circuit breaker cannot be closed due to the fact that the temperature sensing element is not reset in time to interfere with the traction rod does not occur, and the problem that the circuit breaker cannot be closed in a short time due to the fact that the temperature sensing element is not reset in time in the molded case circuit breaker is solved.

The temperature sensing element is selected from double-gold, triple-gold or shape memory alloy.

The double gold is used as a common temperature sensing element in low-voltage electricity and can be applied to the thermal tripping for sensing the heat change on a main loop conductor. The shape memory alloy SME is currently capable of having a soak temperature (at which deformation occurs) set at 50 ° -150 ° (the soak temperature may be any value within a range, not meaning deformation occurs within this temperature range), which already substantially covers the highest value of the temperature of the main loop conductor at overload, so that the shape memory alloy SME may also be applied in such a thermal trip structure.

The design of the shape of temperature sensing element is various, as long as can guarantee the shape of temperature sensing element deformation when the main loop is transshipping and the shape when initial state are different, just can make things convenient for the arrangement of trigger switch subassembly for trigger switch subassembly, for example: 1. the shape of the temperature sensing element is straight in the initial state, and is curved after deformation; 2. the shape of the temperature sensing element is curved in the initial state, and is flat after deformation; 3. the shape of the temperature sensing element is a first bending shape in an initial state, and is a second bending shape after deformation, and the bending degree of the first bending shape is larger than that of the second bending shape; 4. the shape of the temperature sensing element is a first bending shape in an initial state, and is a second bending shape after deformation, and the bending degree of the second bending shape is larger than that of the first bending shape.

The temperature sensing element senses the occurrence of heat of the main circuit conductor, such as direct heating or side heating.

Taking the side heating type as an example, the temperature sensing element is at least partially attached to the main loop conductor. The temperature sensing element is attached to the main loop conductor, and the other end of the temperature sensing element is fixed on the circuit breaker shell or one end of the temperature sensing element is fixed on the main loop conductor, and the temperature sensing element is contacted with the main loop conductor to heat the temperature sensing element by adopting heat conduction, so the temperature sensing element is called as a bypass type structure.

Taking direct heating as an example, the main loop conductor comprises a first conductor and a second conductor, the temperature sensing element is electrically connected between the first conductor and the second conductor, and at least one of the two ends of the temperature sensing element is electrically connected through soft connection or soft conductive braided fabric or soft wire. The temperature sensing element is equivalent to a part of a main loop conductor, and can be heated directly due to abnormal current of the main loop, and the structure is also called a direct heating type structure. At least one end of the temperature sensing element is connected through soft connection or soft conductive braid or soft wire, and the connection is favorable for deformation of the temperature sensing element.

As trigger switch assemblies, the options are also diverse, such as microswitches, hall switch assemblies, photo detection switches.

Taking the micro-switch as an example, the micro-switch can be arranged in the deformation direction of the temperature sensing element or in the opposite direction of the deformation direction of the temperature sensing element. When the temperature sensing element is arranged in the deformation direction of the temperature sensing element, the micro switch is pushed after the deformation of the temperature sensing element. Otherwise, the micro switch is pulled after the deformation of the temperature sensing element. The micro switch can be provided with or without a lever, and the temperature sensing element acts on the micro switch in a mode of directly acting on the button when the lever is not provided, and acts on the micro switch in a mode of indirectly acting on the button after acting on the lever when the lever is provided.

Taking a hall switch assembly as an example, the hall switch assembly comprises a permanent magnet and a hall element, wherein one of the permanent magnet and the hall element can be arranged on the temperature sensing element, the other one of the permanent magnet and the hall element is arranged near the temperature sensing element, and the hall element is electrically connected with the controller. When overload occurs, the temperature sensing element deforms to trigger the permanent magnet and the Hall element (approaching to each other to the trigger position), and the controller obtains a trigger signal at the moment, so that the work of driving the release can be performed.

Taking a photoelectric detection switch as an example, the photoelectric detection switch comprises a detection circuit, an emitter and a receiving electrode, the detection circuit is electrically connected with a controller, the emitter generates a light beam for the receiving electrode to receive, the emitter and the receiving electrode are arranged near a temperature sensing element, when overload occurs, the temperature sensing element deforms to enable light information received by the receiving electrode to change, the controller receives a trigger signal through the detection circuit, and at the moment, the controller drives a release to work. The change of the light information received by the receiving electrode can be received in the non-overload state, and the change of the light information from light to no light on the light beam path is shielded by the deformation of the temperature sensing element in the overload state, and the change of the light information from no light to light is not received in the non-overload state (the temperature sensing element is blocked on the light beam path), and the light information from no light to light is exposed by the deformation of the temperature sensing element (the temperature sensing element leaves the light beam path) in the overload state.

The driving relationship between the trigger switch assembly and the temperature sensing element can be either direct or indirect, whichever form of trigger switch assembly is employed.

Taking a direct driving mode as an example, the device comprises a linkage component, wherein the linkage component and the temperature sensing element are integrally formed (made of the same material as the temperature sensing element) and used for triggering the switch assembly after the temperature sensing element is deformed. Of course, the direct driving mode also comprises a split forming mode, for example, the linkage component is an independent component and is fixed on the temperature sensing element in a riveting, sleeving, clamping, screw fastening, interference fit and other modes, and the linkage component is used for triggering the switch assembly after the temperature sensing element is deformed. The direct driving mode has the advantages of simpler structure, fewer parts and stable performance.

Taking an indirect driving mode as an example, the linkage component is arranged on the bracket in a sliding or rotating mode, and the bracket can be a part of the circuit breaker shell or a component fixed on the circuit breaker shell; the temperature sensing element triggers the linkage part after deformation, and the linkage part acts on the trigger switch assembly after sliding or rotating, and the temperature sensing element indirectly acts on the trigger switch assembly. The indirect triggering mode can enable the position designs of the temperature sensing element and the trigger switch component to be more diversified, and the position relation between the deformation quantity of the temperature sensing element and the trigger switch component does not need to be fully considered like direct triggering.

The embodiments can be applied to not only two-pole circuit breakers but also three-pole and four-pole circuit breakers, as long as the trigger switch component and the temperature sensing element are arranged on each pole of main loop conductor.

The contents of the above embodiment will be described below with reference to a preferred embodiment.

Examples

As shown in fig. 1-15, an embodiment of the present application is a circuit breaker, which includes a base 1b, a cover 1a, an operating mechanism, two arc extinguishing chambers, two sets of main loop conductors d, an operating mechanism, a magnetic release t, a controller 4, two temperature sensing elements 2, and two trigger switch assemblies k.

The base 1b and the cover 1a form a circuit breaker housing for accommodating the operating mechanism, the arc extinguishing chamber, the two sets of main loop conductors d and other components. The base 1b is separated by the inter-phase isolation ribs to form a tripolar cavity, wherein a main loop conductor d and an arc extinguishing chamber are arranged in the tripolar cavity.

The operating mechanism comprises a frame, a handle, a lever, a jump buckle, a lock catch, a rebuckling, a traction rod 3, an upper connecting rod, a lower connecting rod and a main tension spring. When the operating mechanism is in a closing position, the moving contact and the fixed contact (the moving contact and the fixed contact are part of the main loop conductor) are attached, and at the moment, if the traction rod 3 is driven to rotate, the balance of the force in the operating mechanism is broken, so that the operating mechanism is converted into a brake-separating state, the operating mechanism drives the moving contact to separate from the fixed contact to realize brake separation of the circuit breaker, and the brake-separating operation is performed by the operating mechanism. The operating mechanism with such a structure belongs to the prior art in the field of molded case circuit breakers, and will not be described in detail here.

The magnetic release t is a magnetic release, and is arranged in a cavity formed by the cover body 1a and the base 1b, and the ejector rod is positioned near the traction rod 3. The magnetic flux release is electrically connected with the controller 4 and can be driven by the controller 4 to operate, namely, the ejector rod of the magnetic flux release moves to impact the traction rod 3 to rotate, so that the operating mechanism is converted into a brake-separating state from a brake-closing state. Of course, the magnetic release t may be a shunt release other than the magnetic release. In addition to the embodiment described in the present embodiment, the magnetic release t is directly mounted inside the cover 1a, and may be mounted in an accessory manner in an accessory groove of the cover 1 a.

The two groups of main loop conductors d are provided with a temperature sensing element 2 and a trigger switch component k, and the two groups of main loop conductors d have similar structures, and taking one group as an example:

the temperature sensing element 2 is a bimetallic strip, as shown in fig. 3, one end of the temperature sensing element 2 is riveted on the main loop conductor d (also called a thermal element), so that when overload occurs, the bimetallic strip experiences thermal deformation and bending due to heat conduction at the position (riveting position) which is in contact with the main loop conductor d. Of course, instead of the bimetal, a metal or an alloy which can significantly change shape with a temperature change, such as a trimetal plate or a shape memory alloy, may be used. In addition to this, the temperature sensing element 2 is fixed to the main circuit conductor d by a variety of fixing methods other than caulking, for example, by a snap-fit, interference fit, insertion, screw fastening, or the like. Of course, the fixing position of the temperature sensing element 2 may be fixed to the base 1b, so long as the temperature sensing element 2 can be ensured to be in contact with the main circuit conductor d for heat conduction.

As a modified embodiment, the temperature sensing element 2 adopts a direct heating type structure, as shown in fig. 4, the main loop conductor d includes a first conductor d1 and a second conductor d2, one end of the temperature sensing element 2 is connected to the first conductor d1 through a flexible connection d3 or a flexible conductive braid or flexible wire, and the other end of the temperature sensing element 2 is electrically connected to the second conductor d 2. Of course, the connection relation between the first conductor d1 and the second conductor d2 and the temperature sensing element 2 may be reversed.

And the trigger switch component k is electrically connected with the controller 4, and after being triggered, the controller 4 triggers a signal to drive the magnetic release t to work. There are many kinds of trigger switch assemblies k, in which the trigger switch assembly k of one embodiment employs a micro switch k1, where the micro switch k1 is disposed near the temperature sensing element 2 (for example, fixed on a fixed plate in the base 1b, or directly fixed on the base 1 b), and when overload occurs, the temperature sensing element 2 deforms to trigger the micro switch k1 to change its state.

As a modified embodiment, as shown in fig. 5, the trigger switch assembly k is an example of a hall switch assembly including a permanent magnet k21 and a hall element k22, the permanent magnet k21 being provided on the temperature sensing element 2, the hall element k22 being disposed in the vicinity of the temperature sensing element 2 (deformed at a position in a trajectory of the temperature sensing element 2 from an initial state to a deformed state and extremely close to the deformed state), the hall element k22 being electrically connected to the controller 4. When overload occurs, the temperature sensing element 2 deforms to enable the permanent magnet k21 and the Hall element k22 to approach each other to be triggered, and at the moment, the controller 4 obtains a trigger signal, so that the magnetic release t can be driven to work. In this embodiment, it is also possible to exchange the position of the permanent magnet k21 with that of the hall element k 22.

As a further modified embodiment, as shown in fig. 6, the trigger switch assembly k is a photoelectric detection switch including a detection circuit k31, an emitter k32, and a receiving electrode k33, the detection circuit k31 being electrically connected to the controller 4, the emitter k32 generating a light beam for receiving the receiving electrode k33, the emitter k32 and the receiving electrode k33 being disposed in the vicinity of the temperature sensing element 2 (in a trajectory of the temperature sensing element 2 from an initial state to a deformed state, and being deformed at a position extremely close to the deformed state). When overload does not occur, the receiving electrode k33 can receive the light beam, when overload occurs, the receiving electrode k33 cannot receive the light beam due to the deformation shielding of the temperature sensing element 2 between the two electrodes, the controller 4 senses the change of the light information from light to no light (actually, a trigger signal) through the detection circuit k31, and at the moment, the controller 4 drives the release to work. Of course, the photoelectric detection switch can also adopt a setting form of changing the light information from no light to light, namely, the photoelectric detection switch can not receive the light beam (blocked by the temperature sensing element 2) in a non-overload state, and can receive the light beam from no light to light when the temperature sensing element 2 is deformed to leave the blocking position in overload, and the receiving electrode k33 receives the light beam.

In any of the trigger switch assemblies k, the trigger switch assembly k may be disposed in a deformation direction of the temperature sensing element 2 or in a direction opposite to the deformation direction, and the micro switch k1 is taken as an example (the micro switch k1 may be disposed in another manner of the trigger switch assembly k), as shown in fig. 3, the micro switch k1 is disposed in a direction opposite to the deformation direction of the temperature sensing element 2, and one end of the temperature sensing element 2 has a linkage member 5, where the linkage member 5 and the temperature sensing element 2 are an integral member, and the linkage member 5 extends to the vicinity of the micro switch k1, and when overload occurs, the temperature sensing element 2 deforms to cause the linkage member 5 to pull the micro switch k1 to change state. As shown in fig. 7, the micro switch k1 is arranged in the deformation direction of the temperature sensing element 2, and when overload occurs, the temperature sensing element 2 deforms to push the micro switch k1 to change the state. Of course, the above-mentioned micro switch k1 may be selected as the micro switch k1 with a lever or the micro switch k1 without a lever, and both micro switches k1 themselves are of a conventional structure. Of course, as a variant embodiment, the above-mentioned linkage member 5 and the temperature sensing element 2 may be separate, and the linkage member 5 may be fixed to the temperature sensing element 2 by means of socket joint, interference fit, screw fastening, clamping, or the like at a later stage.

Instead of such a temperature-sensitive element 2 being essentially in the form of a direct action on the trigger switch assembly k, it is also possible to use an indirect drive: also taking the micro switch k1 as an example (the other mode of setting the trigger switch assembly k can refer to the micro switch k 1), as an embodiment in which the linkage member 5 is slidably set, as shown in fig. 8-9, the linkage member 5 is slidably set between the temperature sensing element 2 and the micro switch k1 (slidably set on the base 1b or on a fixed plate on the base 1 b), and when overload occurs, the deformation and bending of the temperature sensing element 2 pushes the linkage member 5 to slide, and the linkage member 5 slides to drive the micro switch k1. As an embodiment in which the linking member 5 is provided in a rotatable manner (rotatably provided on the base 1b or on one of the fixing plates provided on the base 1 b), as shown in fig. 10 to 11, the linking member 5 is rotatably provided between the temperature sensing element 2 and the microswitch k1 (rotatably provided on the base 1b or on one of the fixing plates provided on the base 1 b), and when overload occurs, deformation and bending of the temperature sensing element 2 causes the linking member 5 to rotate, and the microswitch k1 is driven after the linking member 5 rotates.

In addition to the above-described arrangement form and arrangement position of the temperature sensing element 2 and the trigger switch assembly k, the shape of the temperature sensing element 2 may be arranged in various ways, and in this embodiment, as shown in fig. 12, the temperature sensing element 2 is flat in an initial state (unheated state), and when overload occurs, the temperature sensing element 2 is deformed to be curved. Of course, as some modified embodiments, as shown in fig. 13, the temperature sensing element 2 may be curved in the initial state and flat after being deformed. As shown in fig. 14, the temperature sensing element 2 has a first curved shape when in an initial state, and a second curved shape after being deformed, and the degree of curvature of the first curved shape is smaller than that of the second curved shape. As shown in fig. 15, the temperature sensing element 2 has a first curved shape when in an initial state, and a second curved shape after being deformed, and the degree of curvature of the first curved shape is larger than that of the second curved shape. Whichever shape is set, it is sufficient to ensure that the temperature-sensitive element 2 forms a significantly different shape in the initial state and in the deformed state (when overload occurs) so as to trigger the switch assembly k.

The above-described structure may be provided in a 3P or 4P molded case circuit breaker, in addition to the 2P molded case circuit breaker. Besides being arranged in a common molded case circuit breaker, the structure can be adopted in some intelligent molded case circuit breakers as long as overload protection needs to be arranged in the molded case circuit breaker.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Although embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims (10)

1. A circuit breaker includes an operating mechanism, a magnetic trip, a controller, and a main loop conductor; the main loop conductor comprises a moving contact and a fixed contact, and the operating mechanism is used for driving the moving contact and the fixed contact to contact and separate so as to realize the connection and disconnection of the circuit breaker; the magnetic release is driven by the controller and then triggers a traction rod of the operating mechanism, so that the operating mechanism is switched from the closing state to the opening state; the method is characterized in that: the device also comprises a trigger switch assembly and a temperature sensing element; the trigger switch assembly is electrically connected with the controller, the controller is electrically connected with the magnetic release, and the controller drives the magnetic release to work after the trigger switch assembly is triggered; the temperature sensing element is used for sensing heat of the main loop conductor, and the trigger switch assembly is triggered by deformation of the temperature sensing element after overload of the main loop occurs.

2. A circuit breaker according to claim 1, characterized in that: the temperature sensing element is made of double-gold or triple-gold or shape memory alloy.

3. A circuit breaker according to claim 2, characterized in that: the shape of the temperature sensing element is straight in the initial state, and is curved after deformation; or the shape of the temperature sensing element is curved in an initial state and is flat after deformation; or the shape of the temperature sensing element is in a first bending shape in an initial state, and is in a second bending shape after deformation, wherein the bending degree of the first bending shape is larger than that of the second bending shape; or the shape of the temperature sensing element is in a first bending shape in an initial state, and is in a second bending shape after deformation, and the bending degree of the second bending shape is larger than that of the first bending shape.

4. A circuit breaker according to claim 1, characterized in that: the temperature sensing element is at least partially attached to the main loop conductor.

5. A circuit breaker according to claim 4, wherein: one end of the temperature sensing element is fixed on the circuit breaker shell or one end of the temperature sensing element is fixed on the main loop conductor.

6. A circuit breaker according to claim 1, characterized in that: the main loop conductor comprises a first conductor and a second conductor, the temperature sensing element is electrically connected between the first conductor and the second conductor, and at least one of the two ends of the temperature sensing element is electrically connected through soft connection or soft conductive braided fabric or soft wire.

7. A circuit breaker according to claim 1, characterized in that: the trigger switch component is a micro switch, the micro switch is positioned in the deformation direction of the temperature sensing element, and the temperature sensing element triggers a button or a lever of the micro switch in a pushing mode; or the trigger switch component is a micro switch, the micro switch is positioned in the opposite direction of the deformation direction of the temperature sensing element, and the temperature sensing element triggers the micro switch in a pulling mode.

8. A circuit breaker according to claim 1, characterized in that: the trigger switch component is a Hall switch component, and the temperature sensing element triggers the Hall switch component to generate a signal to the controller after deformation; or the trigger switch component is a photoelectric detection switch, and the temperature sensing element triggers the photoelectric detection switch after being deformed due to overload of the main loop.

9. A circuit breaker according to claim 1 or 7 or 8, characterized in that: the temperature sensing element is characterized by further comprising a linkage part, wherein the linkage part and the temperature sensing element are integrally formed, and the linkage part is used for triggering the switch assembly after the temperature sensing element is deformed; or, the temperature sensing element also comprises a linkage part, wherein the linkage part is fixed on the temperature sensing element and is used for triggering the switch assembly after the temperature sensing element is deformed; or, the circuit breaker also comprises a linkage part, the linkage part is arranged on the bracket in a sliding or rotating mode, the temperature sensing element is deformed to trigger the linkage part to slide or rotate, so that the movement of the temperature sensing element triggers the trigger switch assembly, and the bracket is a part of the circuit breaker shell or a part fixed on the circuit breaker shell.

10. A circuit breaker according to claim 1, characterized in that: the circuit comprises at least two poles of main loop conductors, and each pole of main loop conductor is provided with a trigger switch component and a temperature sensing element.