Magnetic release for circuit breaker and circuit breaker equipment

Abstract

The utility model discloses a magnetic release for a circuit breaker and circuit breaker equipment. The magnetic release includes: a frame mounted to a housing of a circuit breaker; a static iron core; a movable iron core slidably mounted to the frame and configured to be movable between a first position and a second position relative to the static iron core; and a tripping rod rotatably mounted to the frame and operably coupled to the movable iron core, the movable iron core begins to abut against the tripping rod and pushes the tripping rod with movement toward the second position at a first position of the movable iron core, the movable iron core does not abut against the tripping rod, and the movable iron core is at an abutting position between the first position and the second position, rotating the tripping rod to abut against a part of a breaking mechanism of the circuit breaker, so that the breaking mechanism of the circuit breaker is broken; and the adjusting part is operably connected between the main body of the movable iron core and the tripping rod, and the adjusting part is configured to be capable of switching between a first state and a second state, so that the distance between the first position and the abutting position is different in the first state and the second state.

Description

TECHNICAL FIELD

[0001] The present application relates to a magnetic trip unit for a circuit breaker and a circuit breaker device. BACKGROUND

[0002] The trip unit is the brain of the circuit breaker, which is the component that issues the trip command, and is crucial to the circuit breaker. The magnetic trip needs to accurately identify the current value, and judge whether to trip according to the set target. In order to achieve accurate tripping, the threshold of the magnetic trip often needs to be adjusted in the factory, so the design scheme of the magnetic trip becomes the basis for ensuring the accurate tripping of the trip unit and the rapid preparation of the magnetic adjustment in the factory.

[0003] The existing products often adjust the magnetic trip threshold by adjusting the force value of the magnetic spring and the air gap between the magnetic yoke and the armature, and often have the problems of large product size, complex parts, tedious adjustment, and low first-pass rate. CONTENT OF THE INVENTION

[0004] The present application provides a magnetic trip unit for a circuit breaker, which is mounted to a housing of the circuit breaker and configured to perform a trip action in response to a current in the circuit breaker exceeding a predetermined threshold, the magnetic trip unit comprising:

[0005] a frame mounted to the housing of the circuit breaker;

[0006] a static core fixedly mounted to the frame;

[0007] a dynamic core slidably mounted to the frame and configured to move relative to the static core between a first position, in which the dynamic core is away from the static core, and a second position, in which the dynamic core is close to the static core,

[0008] a trip lever rotatably mounted to the frame and operably coupled to the dynamic core, in the first position of the dynamic core, the dynamic core does not abut against the trip lever, in an abutting position between the first position and the second position of the dynamic core, the dynamic core starts to abut against the trip lever, and with the movement towards the second position, the trip lever is pushed to rotate to abut against a part of a breaking mechanism of the circuit breaker, so that the breaking mechanism of the circuit breaker performs breaking,

[0009] the dynamic core comprises an adjusting member operably connected between a main body of the dynamic core and the trip lever, the adjusting member is configured to be switchable between a first state and a second state, so that in the first state and the second state, the distance between the first position and the abutting position is different.

[0010] Advantageously, the dynamic core has a fitting portion and a slide rod, the slide rod is slidably mounted to the frame, and the fitting portion is used to cooperate with the trip lever to drive the trip lever to rotate when the dynamic core moves from the first position towards the second position.

[0011] Advantageously, the trip bar has a rotation axis rotatably mounted to the frame and a first bar extending from the rotation axis, the first bar extending into the opening of the mating portion.

[0012] Advantageously, the adjustment member has a U shape comprising:

[0013] a body;

[0014] a first plate extending from a first side of the body;

[0015] a second plate extending from a second side of the body opposite the first side, such that a space is formed between the first plate and the second plate, the space being configured to receive a top wall of a mating portion of a moving iron core.

[0016] Advantageously, the first plate has a first thickness and the second plate has a second thickness greater than the first thickness, in the first state, the first plate is positioned between the top wall of the mating portion and the first bar of the trip bar and is spaced apart from the first bar by a first distance, in the second state, the second plate is positioned between the top wall of the mating portion and the first bar of the trip bar and is spaced apart from the first bar by a second distance, the first distance being greater than the second distance.

[0017] Advantageously, the first plate has a first clasp portion and the second plate has a second clasp portion, the first clasp portion and the second clasp portion being used to clasp the adjustment member on the top wall of the mating portion.

[0018] Advantageously, the first clasp portion and the second clasp portion do not overlap each other.

[0019] The present application also provides a circuit breaker device comprising the magnetic trip according to the above and the circuit breaker. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and other features and advantages of the exemplary embodiments of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which:

[0021] Figure 1 shows a perspective view of a magnetic trip for a circuit breaker according to the present application.

[0022] Figure 2 shows a plan view of a magnetic trip according to the present application.

[0023] Figure 3 shows a perspective view of another view of a magnetic trip for a circuit breaker according to the present application.

[0024] Figure 4 shows a perspective view of an adjustment member according to the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the technical solutions of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be described clearly and completely below in conjunction with the drawings of the embodiments of the present disclosure. The same reference signs in the drawings represent the same components. It should be noted that the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present disclosure.

[0026] Compared with the embodiments shown in the drawings, the feasible implementation solutions within the protection scope of the present disclosure can have fewer components, have other components not shown in the drawings, have different components, have differently arranged components or differently connected components, etc. In addition, two or more components in the drawings can be implemented in a single component, or a single component shown in the drawings can be implemented as a plurality of separate components.

[0027] Unless otherwise defined, technical terms or scientific terms used herein should be understood as having the common meaning in the field of the present disclosure to those of ordinary skill. The use of "first", "second" and similar words in the specification and claims of the present disclosure does not indicate any order, number or importance, but is only used to distinguish different components. When the number of components is not specified, the number of components can be one or more; similarly, the words "one", "the", "said" and the like do not necessarily indicate a quantity limitation. The words "include" or "contain" and the like mean that the elements or objects before the words cover the elements or objects listed after the words and their equivalents, without excluding other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate the relative positional relationship of the device in use or the positional relationship shown in the drawings, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] Figure 1 A magnetic trip unit for a circuit breaker is shown according to the present application, which is mounted to a housing of the circuit breaker and configured to trip in response to a current in the circuit breaker exceeding a predetermined threshold. The magnetic trip unit comprises: a frame 1 mounted to the housing of the circuit breaker; a static core (not shown) fixedly mounted to the frame 1; a moving core 3 slidably mounted to the frame and configured to move relative to the static core between a first position, in which the moving core is away from the static core, and a second position, in which the moving core is close to the static core. The second position can also be referred to as an attracted position, in which the moving core is attracted to the static core.

[0029] The trip lever 2 is rotatably mounted to the frame 1 and operably coupled to the moving core 3, in the first position of the moving core, the moving core does not abut against the trip lever (as shown in Figure 2The moving iron core moves to an abutment position between the first position and the second position during the movement of the moving iron core from the first position towards the second position, at which the moving iron core starts to abut the trip bar, and pushes the trip bar 2 to rotate against a part of the breaking mechanism of the circuit breaker as the moving iron core continues to move towards the second position, so that the breaking mechanism of the circuit breaker breaks.

[0030] The moving iron core comprises an adjusting member 31 operatively connected between the main body of the moving iron core and the trip bar 2. The adjusting member 31 is configured to be switchable between a first state and a second state, so that the distance between the first position and the abutment position is different in the first state and the second state.

[0031] The moving iron core 3 has an attraction portion 34, a cooperating portion 32, and a slide bar 33 connected between the attraction portion 34 and the cooperating portion 32, the slide bar 33 being slidably mounted to the frame, the cooperating portion 32 being configured to cooperate with the trip bar to drive the trip bar to rotate when the moving iron core moves from the first position towards the second position. The attraction portion 34 is configured to be attracted to the stationary iron core.

[0032] The trip bar 2 has a rotating shaft 21 rotatably mounted to the frame and a first bar 22 extending from the rotating shaft, the first bar 22 extending into the opening of the cooperating portion. The cooperating portion is formed as a frame having a top wall.

[0033] In an example, as Figure 4 The adjusting member 31 has a U-shaped shape comprising a body 311, a first plate 312 extending from a first side of the body, and a second plate 313 extending from a second side of the body opposite to the first side, so that a space is formed between the first plate and the second plate, the space being configured to accommodate the top wall of the cooperating portion of the moving iron core.

[0034] The first plate 312 has a first thickness, and the second plate 313 has a second thickness greater than the first thickness. In the first state, the first plate 312 is located between the top wall of the cooperating portion and the first bar of the trip bar, and is spaced apart from the first bar by a first distance; in the second state, the second plate 313 is located between the top wall of the cooperating portion and the first bar of the trip bar, and is spaced apart from the first bar by a second distance, the first distance being greater than the second distance. That is, in the first state, the first distance between the first position and the abutment position is relatively large due to the smaller first thickness of the first plate, while in the second state, the second distance between the first position and the abutment position is relatively small due to the larger second thickness of the second plate. Thus, the magnetic tripping threshold can be adjusted by simply adjusting when the moving and stationary cores abut the trip bar.

[0035] The first plate 312 has a first clamping portion 3121, and the second plate 313 has a second clamping portion 3131, the first clamping portion and the second clamping portion being used to clamp the adjusting member on the top wall of the cooperating portion. AsFigure 4 As shown, the first and second snap portions do not overlap each other, for example, the first snap portion is arranged at both sides of the first plate, and the second snap portion is arranged at a central position of the second plate.

[0036] The application also provides a circuit breaker device comprising a magnetic trip unit and a circuit breaker.

[0037] Although the present application has been described in the specification and illustrated in the drawings on the basis of various embodiments, it is to be understood that the above-described embodiments are only preferred implementation, and some technical features in the embodiments may not be essential to solve the specific technical problems, so that these technical features can be omitted without affecting the solution of the technical problems or the formation of the technical scheme; moreover, the features, elements and / or functions of one embodiment can be appropriately combined, combined or matched with those of one or more other embodiments, unless the combination, combination or matching is obviously not implementable.

Claims

1. A magnetic trip unit for a circuit breaker, the magnetic trip unit being mounted to a housing of the circuit breaker and configured to perform a tripping action in response to a current in the circuit breaker exceeding a predetermined threshold, the magnetic trip unit comprising: a frame mounted to the housing of the circuit breaker; a static core fixedly mounted to the frame; a moving core slidably mounted to the frame and configured to move relative to the static core between a first position in which the moving core is distanced from the static core and a second position in which the moving core is proximate to the static core, a trip lever rotatably mounted to the frame and operably coupled to the moving core, in the first position of the moving core, the moving core does not abut the trip lever, in an abutment position between the first position and the second position of the moving core, the moving core starts to abut the trip lever and pushes the trip lever to rotate as moving towards the second position, causing a part of a breaking mechanism of the circuit breaker to be abutted by the trip lever, so that the breaking mechanism of the circuit breaker performs breaking, characterized in that the moving core comprises an adjustment member operably connected between a main body of the moving core and the trip lever, the adjustment member being configured to be switchable between a first state and a second state, so that in the first state and the second state, a distance between the first position and the abutment position is different.

2. The magnetic trip unit of claim 1, wherein the magnetic trip unit is configured to be mounted to a surface of the electrical device. the moving core has a mating portion for mating with the trip lever to drive the trip lever to rotate when the moving core moves from the first position towards the second position, a pull-in portion, and a slide rod connected between the mating portion and the pull-in portion, the slide rod being slidably mounted to the frame.

3. The magnetic trip unit of claim 2, wherein the magnetic trip unit is configured to be mounted to a surface of the electrical device. the trip lever has a rotation shaft rotatably mounted to the frame and a first lever extending from the rotation shaft, the first lever extending into an opening of the mating portion.

4. The magnetic trip unit of claim 3, wherein the magnetic trip unit is configured to be mounted to a surface of the electrical device. the adjustment member has a U shape and comprises: a main body, a first plate extending from a first side of the main body, a second plate extending from a second side of the main body opposite to the first side, so that a space is formed between the first plate and the second plate, the space being configured to accommodate a top wall of the mating portion of the moving core.

5. The magnetic trip unit of claim 4, wherein the magnetic trip unit is configured to be mounted to a surface of the electrical device. the first plate has a first thickness and the second plate has a second thickness greater than the first thickness, in the first state, the first plate is located between the top wall of the mating portion and the first lever of the trip lever and is spaced apart from the first lever by a first distance, in the second state, the second plate is located between the top wall of the mating portion and the first lever of the trip lever and is spaced apart from the first lever by a second distance, the first distance being greater than the second distance.

6. The magnetic trip unit of claim 5, wherein the magnetic trip unit is configured to be mounted to a surface of the electrical device. the first plate has a first clamping portion and the second plate has a second clamping portion, the first clamping portion and the second clamping portion being used to clamp the adjustment member on the top wall of the mating portion.

7. The magnetic trip unit of claim 6, wherein the magnetic trip unit is configured to be mounted to a surface of the magnetic trip unit. the first clamping portion and the second clamping portion do not overlap each other.

8. A circuit breaker apparatus comprising the magnetic trip unit of any one of claims 1 to 7 and a circuit breaker.

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