Overload alarm non-tripping device and circuit breaker

Abstract

The device comprises a support, a plurality of bimetallic assemblies, a plurality of transmission structures corresponding to the bimetallic assemblies and a plurality of alarm switches, the alarm switches are fixedly assembled on the support, and pins of the alarm switches are connected in parallel and then connected with an automatic reset alarm circuit. One end of the transmission structure is fixedly connected with the movable end of the bimetallic assembly, and when the bimetallic assembly deforms or resets, the other end of the transmission structure pushes or loosens the switch structure on the top of the alarm switch to open or close the automatic reset alarm circuit. The problems that in the prior art, an alarm non-tripping structure is complex, and product performance is unstable are solved, and the beneficial effects that the alarm non-tripping stability is improved, and product universality is improved are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of low-voltage circuit breakers, and in particular to an overload alarm non-tripping device of a molded case circuit breaker and a circuit breaker. Background Art

[0002] Low-voltage circuit breakers, also known as low-voltage automatic switches, are mainly used for infrequently connecting or disconnecting circuits. Low-voltage circuit breakers have overload, short-circuit and undervoltage protection. When the circuit is overloaded, short-circuited or undervoltage occurs, the circuit breaker can automatically disconnect the circuit within a specified time to protect the power line and power supply equipment. However, in important distribution lines, if the circuit breaker automatically disconnects the circuit due to overload in the circuit, it will cause significant economic losses. Therefore, it is necessary for the circuit breaker to issue an alarm when an overload occurs in the circuit instead of automatically cutting off the circuit, so that users can troubleshoot the fault as soon as possible to avoid economic losses and other safety hazards caused by circuit disconnection. The alarm non-tripping product of the prior art acts on the alarm non-tripping traction rod through the deformation delay screw of the bimetallic component, and the alarm function is realized by rotating the traction rod and pressing a separate micro switch, but the bending accuracy of the bimetallic component due to heat is difficult to control, and the deformation of the three-phase bimetallic component of the circuit breaker acts on the different positions of the traction rod. If the three phases cannot act simultaneously, the rotation of the alarm non-tripping traction rod is prone to line jamming, and the alarm function triggering needs to be transmitted through multiple stages, and the product performance is unstable. Summary of the invention

[0003] In view of the deficiencies of the prior art, the present application provides an overload alarm non-tripping device to solve the problems of complex structure and unstable product performance of the above-mentioned prior art.

[0004] To achieve the above objectives, this application is implemented through the following technical solutions:

[0005] An overload alarm non-tripping device comprises a bracket and a plurality of bimetallic components, a plurality of transmission structures corresponding to the bimetallic components and a plurality of alarm switches, wherein the plurality of alarm switches are fixedly assembled on the bracket and their pins are connected in parallel with an automatic reset alarm circuit, one end of the transmission structure is fixedly connected to the movable end of the bimetallic component, and when the bimetallic component is deformed or reset, the other end of the transmission structure pushes or releases the switch structure on the top of the alarm switch to open or close the automatic reset alarm circuit.

[0006] Preferably, the alarm switch uses a micro switch.

[0007] Preferably, the transmission structure includes a push rod, a slide plate, and a delay screw assembly, one end of the push rod is fixedly connected to the movable end of the bimetallic assembly, the other end of the push rod is perpendicular to the movable end of the bimetallic assembly and is mounted with a slide plate, the delay screw assembly is fixed on the slide plate, the slide plate drives the delay screw assembly to slide along the tangential direction of the other end of the push rod at the movable end of the bimetallic assembly, and the bottom of the delay screw assembly pushes or releases the switch structure at the top of the alarm switch.

[0008] Preferably, screw fixing holes are provided on the other end of the push rod and the slide plate, and the delay screw assembly fixes the slide plate to the push rod through the screw fixing holes.

[0009] Preferably, the screw fixing hole at the other end of the push rod is a waist-shaped hole along the tangent direction of the movable end of the bimetallic component.

[0010] Preferably, the delay screw assembly includes a screw and a nut, and the screw passes through the other end of the push rod and the screw fixing hole on the slide plate, and the slide plate is fixed below the push rod using the nut above the push rod.

[0011] Preferably, the slide plate is provided with upward wings on both sides of the push rod, and the wings wrap around both sides of the push rod.

[0012] Preferably, one end of the push rod is provided with a bend along the direction of the bimetallic component body, and is fixedly connected to the movable end of the bimetallic component through the bend.

[0013] Preferably, the bending and the movable end of the bimetallic component are provided with screw fixing holes, and the two are fixedly connected by screws.

[0014] Based on the same inventive concept, the present application also discloses a circuit breaker, comprising the above-mentioned overload alarm non-tripping device.

[0015] Compared with the prior art, the present invention has the following beneficial effects: the circuit breaker of the present invention is bent backward by the heating and deformation of the bimetallic element, and the push rod is driven to contact the micro switch and press the button to switch the state of the micro switch. When an overload occurs in the circuit, an alarm is issued instead of automatically cutting off the circuit, so that the user can troubleshoot the fault as soon as possible, avoiding economic losses and other safety hazards caused by circuit disconnection, and the structure is simple and reliable. The overload non-tripping device structure of the present application sets micro switches in three phases, and the micro switches are welded in parallel on the circuit board. The three micro switches only need to retain two leads to connect to the external alarm device. When the circuit breaker is overloaded, the push rod fixed on the bimetal directly acts on the micro switch to realize the alarm through the deformation of the bimetal. The micro switch can be triggered by any phase of the three-phase bimetal to realize the alarm function, and the alarm signal responds quickly. The slider push rod screw structure on the bimetal can realize the effect of sharing parts of different shell frame products, and realize product versatility. Different volumes of molded case circuit breakers only need to add a bracket and PCB board for fixing the micro switch, and the rest of the parts can be universal. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of a three-dimensional structure of an embodiment of the present application;

[0017] Figure 2 This is a partial enlarged view of an embodiment of the present application;

[0018] Among them, 1-bimetal component, 2-push rod, 3-slide plate, 4-delay screw assembly, 5-micro switch, 6-bracket. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0020] The present embodiment provides a technical solution: the present solution discloses an overload alarm non-tripping device, which sets an alarm switch through three phases, including a bracket 6 and three bimetallic components 1, three transmission structures corresponding to the bimetallic components 1 and three alarm switches. The three-phase alarm switch 5 is fixedly assembled on the bracket 6 and its pins are connected in parallel with an automatic reset alarm circuit. In the present embodiment, the three alarm switches are welded in parallel on the circuit board. The three micro switches only need to retain two leads to connect the automatic reset alarm circuit and finally connect to the alarm device. The alarm function can be realized by triggering the micro switch of any phase of the three-phase bimetal. One end of the transmission structure is fixedly connected to the active end of the bimetallic component 1. When the bimetallic component 1 is deformed or reset, the other end of the transmission structure pushes or releases the switch structure on the top of the alarm switch to open or close the automatic reset alarm circuit.

[0021] The alarm switch in this embodiment uses a micro switch 5, and the top of the micro switch 5 has a contact and a straight handle, which constitute the switch structure at the top of the alarm switch. The straight handle presses the contact downward or releases the contact to open or close the automatic reset alarm circuit. In addition to using a micro switch, the alarm switch can also use other types of switches such as a touch switch.

[0022] The transmission structure described in this embodiment includes a push rod 2, a slide plate 3, and a delay screw assembly 4. One end of the push rod 2 is fixedly connected to the movable end of the bimetallic assembly 1, and the other end of the push rod 2 is perpendicular to the movable end of the bimetallic assembly 1 and is mounted with a slide plate 3. The delay screw assembly 4 is fixed on the slide plate 3. The slide plate 3 drives the delay screw assembly 4 to slide along the tangent direction of the other end of the push rod 2 at the movable end of the bimetallic assembly 1. The bottom of the delay screw assembly 4 pushes or releases the switch structure at the top of the alarm switch.

[0023] The other end of the push rod 2 and the slide plate 3 are both provided with screw fixing holes, and the delay screw assembly 4 fixes the slide plate 3 to the push rod 2 through the screw fixing holes. The screw fixing hole at the other end of the push rod 2 is a waist-shaped hole along the tangent direction of the active end of the bimetal assembly 1.

[0024] The time-delay screw assembly 4 includes a screw and a nut. The screw passes through the screw fixing hole on the other end of the push rod 2 and the slide plate 3, and the slide plate 3 is fixed to the bottom of the push rod 2 using the nut above the push rod 2. The slide plate 3 is provided with upward wings on both sides of the push rod 2, and the wings wrap around both sides of the other end of the push rod 2. The screw in the screw assembly 4 can slide in the waist-shaped hole at the other end of the push rod 2 along the tangent direction of the active end of the bimetallic assembly 1 to adjust the position, and can also use the working end at the top of the screw to adjust the position along the screw direction, so that the position can be adjusted in both directions, achieving the effect of sharing parts for different frame products.

[0025] In addition to the above-mentioned sliding structure, the slide plate 3 can also use a fully enclosed structure to cover both sides of the other end of the push rod 2. If the other end of the push rod 2 does not have a waist-shaped hole, the delay screw assembly 4 can be directly fixed to the lower side of the slide plate 3 without extending from the top.

[0026] The end of the push rod 2 fixed to the bimetal component 1 is provided with a bend along the direction of the bimetal component 1 body, and is fixedly connected to the movable end of the bimetal component 1 through the bend. The bend and the movable end of the bimetal component 1 are provided with screw fixing holes, and the two are fixedly connected by screws. In this embodiment, the end of the push rod 2 fixed to the bimetal component 1 is an L-shaped plug-in structure, one end of the root of the L is inserted into the top of the movable end of the bimetal component 1, and one end of the L-shaped side is inserted into another strip plate as the other end of the push rod 2. Of course, other structures such as T-shaped structures can also be used.

[0027] Based on the same inventive concept, the present application also discloses a circuit breaker, including the above-mentioned overload alarm non-tripping device. When the circuit breaker has an overload fault, the bimetal component 1 bends backward and deforms, and the bimetal component 1 drives the delay screw component 4 on the push rod 2 to press the button of the micro switch 5 to switch the state of the micro switch 5 to realize the alarm function. When the circuit breaker is relieved of the overload fault, the bimetal component 1 returns to the initial state, drives the delay screw component 4 at the second end of the push rod 2 to cancel pressing the micro switch 5 button, and the alarm is released. The structure composed of the slider 3, the push rod 2 and the screw component 4 on the bimetal component 1 can achieve the effect of sharing parts for different frame products and realize product versatility. Molded case circuit breakers of different volumes only need to add a bracket 6 and a PCB board for fixing the micro switch 5, and the rest of the parts can be used universally.

[0028] In the description of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, if the terms "first", "second", etc. appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] The above is only a preferred specific implementation method of the present scheme, but the protection scope required by the present scheme is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes according to the technical scheme and inventive concept of the present application within the technical scope disclosed in the present application, which should be covered by the protection scope of the present application.

Claims

1. An overload alarm non-tripping device, characterized in that: The invention comprises a bracket (6) and a plurality of bimetallic components (1), a plurality of transmission structures corresponding to the bimetallic components (1), and a plurality of alarm switches; the plurality of alarm switches (5) are fixedly mounted on the bracket (6) and their pins are connected in parallel to an automatic reset alarm circuit; one end of the transmission structure is fixedly connected to the movable end of the bimetallic component (1); when the bimetallic component (1) is deformed or reset, the other end of the transmission structure pushes or releases the switch structure at the top of the alarm switch to open or close the automatic reset alarm circuit.

2. The overload alarm non-tripping device according to claim 1, characterized in that: The alarm switch (5) uses a micro switch.

3. The overload alarm non-tripping device according to claim 2 is characterized in that: The transmission structure comprises a push rod (2), a slide plate (3), and a delay screw assembly (4); one end of the push rod (2) is fixedly connected to the movable end of the bimetallic assembly (1); the other end of the push rod (2) is perpendicular to the movable end of the bimetallic assembly (1) and is fitted with a slide plate (3); the delay screw assembly (4) is fixed on the slide plate (3); the slide plate (3) drives the delay screw assembly (4) to slide along the tangent direction of the other end of the push rod (2) at the movable end of the bimetallic assembly (1); the bottom of the delay screw assembly (4) pushes or releases the switch structure at the top of the alarm switch.

4. The overload alarm non-tripping device according to claim 3 is characterized in that: The other end of the push rod (2) and the slide plate (3) are both provided with screw fixing holes, and the delay screw assembly (4) fixes the slide plate (3) on the push rod (2) through the screw fixing holes.

5. The overload alarm non-tripping device according to claim 4 is characterized in that: The screw fixing hole at the other end of the push rod (2) is a waist-shaped hole along the tangent direction of the movable end of the bimetallic component (1).

6. The overload alarm non-tripping device according to claim 4, characterized in that: The time-delay screw assembly (4) comprises a screw and a nut. The screw passes through the other end of the push rod (2) and the screw fixing hole on the slide plate (3), and the slide plate (3) is fixed below the push rod (2) using the nut above the push rod (2).

7. The overload alarm non-tripping device according to claim 6, characterized in that: The slide plate (3) is provided with upward wing portions on both sides of the push rod (2), and the wing portions wrap around both sides of the push rod (2).

8. The overload alarm non-tripping device according to claim 3 is characterized in that: One end of the push rod (2) is provided with a bend along the direction of the bimetallic component (1) body, and is fixedly connected to the movable end of the bimetallic component (1) via the bend.

9. The overload alarm non-tripping device according to claim 8, characterized in that: The bending and the movable end of the bimetallic component (1) are provided with screw fixing holes, and the two are fixedly connected by screws.

10. A circuit breaker, characterized in that: It comprises the overload alarm non-tripping device as described in any one of claims 1-9.

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