An overload alarm non-tripping circuit breaker

Abstract

The utility model relates to overload alarm undetaching circuit breaker, including shell seat and alarm undetaching unit, alarm undetaching unit contains alarm traction lever, bimetallic strip and micro -switch, alarm traction lever has rotary lever body, drive paddle and trigger paddle, micro -switch is in the trigger paddle action path and is connected alarm circuit, when the line overload, bimetallic strip is bent by heat, its deformation active end pushes drive paddle and makes rotary lever body rotate, drives trigger paddle and press micro -switch, shell seat has assembly notch, its both sides have vertical slot, support has base plate body, and the upper end is equipped with the lever support position, and the both sides of base plate body are connected through easy fold connection edge and can remove the removable widening piece, and the outer edge of widening piece and base plate body can be inserted into the vertical slot, and the assembly width of support is adjusted by removing or keeping the widening piece, and the outer edge of the both sides of support can be inserted into the slot, and the different assembly notches are adapted. Through the removable widening piece of support, the different assembly notches of multi -specification circuit breaker are adapted, and the universality is improved.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to an overload alarm non-tripping circuit breaker. Background Technology

[0002] Circuit breakers are crucial protective electrical devices in low-voltage power distribution systems. They automatically disconnect circuits when faults such as overload, short circuit, or undervoltage occur, ensuring the safety of lines and equipment. In special applications such as fire protection, emergency power supply, and critical load circuits, circuit breakers need to have an overload alarm without tripping function: when an overload current occurs in the line, the circuit breaker only issues an alarm signal without tripping, ensuring continuous power supply and preventing critical equipment from unexpectedly shutting down due to short-term overload. Existing circuit breakers with overload alarm but non-tripping function generally adopt a bimetallic strip thermal triggering structure. Its core components include a housing, an alarm traction rod, a bimetallic strip, a micro switch, and an alarm circuit. The alarm traction rod is rotatably installed inside the housing. One end of the bimetallic strip is fixed, and the other end is free, located next to the alarm traction rod. The micro switch is installed on the operating path of the alarm traction rod and connected to the alarm circuit. When the line is overloaded, the bimetallic strip is heated and bent. The free end pushes the alarm traction rod to rotate, and the alarm traction rod presses the micro switch, causing its contacts to close and output an alarm. It does not act on the circuit breaker's tripping mechanism, so it only alarms and does not trip.

[0003] The shortcomings of existing structures are concentrated in the installation and positioning of the alarm pull rod. Conventional designs have a half-hole on the housing and a corresponding half-hole on the top cover. When the housing and top cover are closed, they form a complete pivot hole for installing the alarm pull rod. However, this assembled hole structure, once formed, has fixed hole diameters and positions, only suitable for circuit breakers of a single size. Different sizes of circuit breakers will inevitably have incompatible housings and top covers. Another solution uses a separate bracket to support the alarm pull rod, with the bracket positioned and installed through an assembly slot on the housing. However, because the bracket's width is fixed, it can only match assembly slots of a specific width. Since different sizes of circuit breakers have different assembly slot sizes on their housings, the fixed-width bracket cannot fit the assembly slots of different circuit breaker sizes. Different sizes of circuit breakers still require custom-made brackets, resulting in poor compatibility. Utility Model Content

[0004] The purpose of this utility model is to overcome the defects of the prior art and provide an overload alarm non-tripping circuit breaker. The bracket can be widened by disassembling and assembling a piece to adapt to the assembly slots of different widths on various specifications of circuit breakers, thereby improving the versatility of the bracket.

[0005] The technical solution of this utility model is as follows: An overload alarm non-tripping circuit breaker includes a housing and an alarm non-tripping unit. The alarm non-tripping unit includes an alarm traction rod, a bimetallic strip, and a micro switch. The alarm traction rod includes a rotating rod body, a driving lever and a trigger lever disposed on the rotating rod body. One end of the bimetallic strip is fixed to the housing body, and the other end is provided with a deformable movable end. The deformable movable end is aligned with the driving lever. The micro switch is located on the action path of the trigger lever and is connected to the alarm circuit. When the circuit is overloaded, the bimetallic strip is heated and bent. Its deformable movable end pushes against the driving lever, causing the rotating rod body to rotate, thereby driving the trigger lever to press the micro switch. The housing has an assembly slot inside, and vertical slots are respectively opened on both sides of the assembly slot. A bracket is vertically inserted into the assembly slot. The bracket includes a base plate, and a rod support position is provided at the upper end of the base plate. The rotating rod is rotatably assembled at the rod support position. The two sides of the base plate along the width direction are respectively connected to removable widening plates via easily foldable connecting edges. The widening plates and the outer edges of the base plate can be vertically inserted into the corresponding side slots. The effective assembly width of the bracket can be adjusted by removing or retaining the widening plates. The two sides of the bracket can respectively select the widening plates or the outer edges of the base plate to be inserted into the corresponding side slots, so that the bracket can adapt to assembly slots of various slot width specifications.

[0006] The above technical solution features an assembly slot inside the housing with vertical slots on both sides. These slots allow for vertical insertion and positioning of the bracket, eliminating the need for screws, clips, or other locking components. The bracket is vertically inserted into the slot, allowing for easy removal of the bracket during maintenance of the bimetallic strip, microswitch, and traction rod assembly without disassembling the entire housing. A rod support is located at the top of the bracket's base plate, allowing the rotating rod to hinge to the support, eliminating the need for a pivot hole formed by assembling the housing and top cover, thus simplifying machining and positioning. Furthermore, removable widening plates are connected to both sides of the base plate via easily foldable connecting edges. When the mounting width of the assembly slot needs to be increased, the widening plates are retained, allowing them to be inserted into the slots for positioning. When the slot width is smaller, the widening plates are removed along the easily foldable connecting edges, allowing the outer edge of the base plate to be directly inserted into the slots for positioning. Therefore, a single bracket can adapt to assembly slots of different widths by removing or retaining the widening plates, eliminating the need for custom-made brackets for different circuit breaker specifications, effectively reducing mold costs and improving the bracket's versatility.

[0007] A further feature of this invention is that the easily foldable connecting edge has a thin-walled structure or is provided with intermittent cuts.

[0008] With the above-mentioned further design, the easy-break connecting edge is divided into two structural forms: thin-walled structure and intermittent cut. The wall thickness at the thin-walled position is lower than that of the substrate and the widening piece. When disassembling, it breaks neatly along the thin-walled position without tearing the effective insertion part of the substrate and the widening piece. After disassembly, the side of the bracket still meets the insertion requirements. The intermittent cut creates multiple stress concentration points, and the widening piece can be broken by hand, which is convenient to operate.

[0009] A further feature of this invention is as follows: a pivot protrusion is provided at the rod support position, the rotating rod body is provided with a pivot sleeve, the side wall of the pivot sleeve is provided with a circumferential notch, the pivot protrusion is inserted into the pivot sleeve through the notch and forms a rotational fit, and the two end walls of the notch can form a limiting abutment with the side wall of the pivot protrusion to limit the rotation angle of the rotating rod body, and the rotating rod body is connected to the pivot protrusion by a pivot.

[0010] With the above-mentioned further configuration, the rod support position is equipped with a pivot protrusion, and the rotating rod body is matched with a pivot sleeve with a circumferential notch. During the assembly stage, the pivot protrusion is pre-limited by being inserted into the sleeve through the notch. The pivot shaft, in series with the pivot protrusion and the pivot sleeve, forms a reliable rotational fit, and the pivot sleeve is not easy to fall out of the protrusion, ensuring the stability of the rotational fit of the alarm traction rod. The two end walls of the notch form a limiting abutment with the side wall of the pivot protrusion, limiting the maximum rotational stroke of the rotating rod body, avoiding excessive flipping of the paddle and damage to the micro switch due to overtravel under overload conditions, controlling the pressure amplitude of the micro switch, and extending the service life of the switch.

[0011] A further feature of this invention is that at least two brackets are spaced apart along the axial direction of the alarm traction rod, and each bracket has a rod support position at its upper end. The rotating rod is supported by the support positions of each bracket, and the housing is provided with multiple mounting slots. The micro switch is mounted on one of the brackets.

[0012] With the above-mentioned further configuration, multiple brackets are arranged at intervals along the direction of the alarm traction rod, and each bracket has an independent rod support position to jointly support the rotating rod body, which has a good effect; the housing has multiple assembly slots, so that a single bracket can be disassembled and replaced individually when it fails, without removing the rest of the support structure; the micro switch is fixed on one of the brackets, and the positioning and fixation are completed by relying on the bracket, eliminating the need for a separate mounting base for the switch, simplifying the internal wiring layout and reducing scattered fixing parts.

[0013] A further improvement of this invention is that the width of the base plate of each bracket is set along the axial direction of the vertical alarm traction rod.

[0014] With the above further configuration, the width direction of the base plate of the bracket is arranged perpendicular to the axial direction of the traction rod, the lateral span of the base plate is sufficient, the space for widening the plate is ample, the adjustable range of the bracket width is larger, the stress structure of the base plate is more reasonable, and the bending deformation resistance of the base plate is improved.

[0015] A further feature of this invention is that the bracket is provided, and at least two rod support positions are provided on the upper end of the bracket along the axial direction of the alarm traction rod. The rotating rod body is supported by multiple rod support positions, and the micro switch is mounted on the bracket.

[0016] With the above-mentioned further configuration, a single bracket is provided with two or more rod support positions to support the rotating rod body. The overall structure is more compact, which can reduce the space occupied by the assembly slot on the housing, simplify the processing of the housing, reduce assembly steps, and improve the overall assembly efficiency. The micro switch is directly mounted on the same bracket, and the support structure and switch are integrated into one unit, which is suitable for compact circuit breaker products with narrow internal cavities.

[0017] A further feature of this invention is that the width of the base plate of the bracket is arranged along the axial direction of the alarm traction rod.

[0018] With the above-mentioned further configuration, the base plate of the bracket is arranged along the axial direction of the traction rod, which can reserve sufficient lateral space to arrange multiple rod support positions, ensuring that the support spacing of each support position on the rotating rod is reasonable, the rotating rod is subjected to more uniform force along the axial direction, the rotation process is more stable, and there will be no radial shaking or jamming.

[0019] A further feature of this invention is that the bracket is located below the middle section of the alarm traction rod, and the upper end of the base plate of the bracket is also provided with a support plate. The support plate extends along the axial direction of the alarm traction rod, and each side of the support plate is provided with an upwardly protruding support arm. Each support arm has a rod support position at its top, and the support arms on both sides are respectively limited and abut against the positioning step of the housing.

[0020] With the above-mentioned further configuration, the bracket is arranged below the middle section of the traction rod, supporting the rod from the middle, which can make the rotating rod body evenly stressed and avoid cantilever swaying at one end of the rod; the support plate extends axially, and two support arms can be set simultaneously on a base plate to provide rod support positions respectively, with high structural integration. The support arms on both sides abut against the positioning steps of the housing, which can further limit the lateral displacement of the bracket in the housing and improve the overall installation stability of the bracket. Attached Figure Description

[0021] Figure 1 This is a structural diagram of the first type of circuit breaker of this utility model; Figure 2 for Figure 1 A structural diagram of the shell base; Figure 3 for Figure 1 Diagram of the alarm non-disengagement unit structure; Figure 4 for Figure 1 The support structure diagram, where h1 is the effective assembly width of the support; Figure 5 for Figure 1 Assembly diagram of the alarm traction rod; Figure 6 This is a structural diagram of the second type of circuit breaker of this utility model; Figure 7 for Figure 6 A structural diagram of the shell base; Figure 8 for Figure 6 Diagram of the alarm non-disengagement unit structure; Figure 9 for Figure 6 The support structure diagram shows that h2 is the effective assembly width of the support. Figure 10 for Figure 6 Diagram of the alarm traction rod structure.

[0022] In the diagram: 1. Housing base, 11. Assembly slot, 111. Positioning step, 12. Alarm non-disengagement unit, 2. Alarm traction rod, 21. Rotating rod body, 211. Pivot sleeve, 2111. Circumferential notch, 2112. Drive lever, 212. Trigger lever, 213. Bimetallic strip, 22. Deformable movable end, 221. Micro switch, 23. Bracket, 3. Base plate, 31. Rod support position, 32. Pivot protrusion, 321. Easy-break connecting edge, 33. Widening piece, 34. Support plate, 35. Support arm, 36. Pivot, 4. Detailed Implementation

[0023] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] like Figure 1-10As shown, this utility model discloses an overload alarm non-tripping circuit breaker, including a housing 1 and an alarm non-tripping unit 2. The alarm non-tripping unit 2 includes an alarm traction rod 21, a bimetallic strip 22, and a micro switch 23. The alarm traction rod 21 includes a rotating rod body 211, a drive lever 212 integrally mounted on the rotating rod body 211, and a trigger lever 213. One end of the bimetallic strip 22 is fixed to the housing 1 by screws, etc., and the other end is provided with a deformable movable end 221. The deformable movable end 221 is aligned with the drive lever 212. An adjusting screw is also installed on the moving end; the micro switch 23 is located on the action path of the trigger lever 213 and is connected to the alarm circuit. When the line is overloaded, the bimetallic strip 22 is heated and bent. Its deformed moving end 221 drives the adjusting screw to push the driving lever 212, causing the rotating rod 211 to rotate, thereby driving the trigger lever 213 to press the micro switch 23. The micro switch is a conventional design. After being triggered, it can send an overload alarm signal, so that the circuit breaker only completes the alarm prompt and does not trigger the trip, thus maintaining the continuous power supply of the line. The specific principle will not be described in detail. An assembly slot 11 is integrally formed inside the housing 1. The assembly slot is vertically formed, and vertical slots 111 are formed on opposite sides of the assembly slot 11. A bracket 3 is vertically inserted into the assembly slot 11. The bracket 3 includes a base plate 31, and a rod support position 32 is provided at the upper end of the base plate 31. The rotating rod 211 is rotatably assembled at the rod support position 32. The base plate 31 is connected to removable widening pieces 34 on both sides along the width direction via easily foldable connecting edges 33. The easily foldable connecting edges are thin-walled structures or have intermittent cuts. The widening pieces 34 and the outer edges of the base plate 31 can be vertically inserted into the corresponding side slots 111. The effective assembly width of the bracket 3 can be adjusted by removing or retaining the widening pieces 34. The effective assembly width is the width between the base plate and the widening pieces on both sides after the bracket is inserted into the slot. If the overall lateral dimension perpendicular to the slot direction is retained, the two sides of the bracket 3 can be selected to be widened 34 or the outer edge of the base plate 31 and inserted into the corresponding side slot 111, so that the bracket 3 can be adapted to the assembly slot 11 of various slot width specifications, without the need to customize the bracket separately for different specifications of circuit breakers; Specifically, the rod support position 32 is integrally provided with a pivot protrusion 321, the rotating rod body 211 is integrally provided with a pivot sleeve 2111, the side wall of the pivot sleeve 2111 is provided with a circumferential notch 2112, the pivot protrusion 321 is inserted into the pivot sleeve 2111 through the notch 2112 and forms a rotational fit, and the two end walls of the notch 2112 can form a limiting abutment with the side wall of the pivot protrusion 321 to limit the rotation angle of the rotating rod body 211, and the rotating rod body 211 is connected to the pivot protrusion 321 through a pivot 4.

[0025] The aforementioned bimetallic strips are provided in multiple ways, and the drive levers on the rotating rod are also provided in multiple ways. Each drive lever is aligned and engaged with the deformable movable end of the corresponding bimetallic strip, which can realize the requirement of detecting and alarming multiple circuit overloads separately. When one circuit is overloaded, the corresponding bimetallic strip bends, which can push the corresponding drive lever to drive the rotating rod to complete the alarm trigger.

[0026] The aforementioned alarm pull rod can achieve its rotational reset function by means of the automatic rebound mechanism of a microswitch, or by the deformation recovery force generated by an additional elastic element (such as a spring) after being subjected to force. This conventional design is simple in structure and reliable in operation, enabling the pull rod to quickly and accurately return to its initial position.

[0027] In the first type of bracket structure, at least two brackets 3 are spaced apart along the axial direction of the alarm traction rod 21. Each bracket 3 has a rod support position 32 at its upper end. The rotating rod body 211 is supported by the rod support positions 32 of each bracket 3. The housing 1 is provided with multiple assembly slots 11. The micro switch 23 is mounted on one of the brackets 3. The width direction of the base plate 31 of each bracket 3 is set along the axial direction perpendicular to the alarm traction rod 21. After the bracket is vertically inserted into the assembly slot, the structural stability is better. The easily foldable connecting edges on both sides are arranged laterally with the widening plate, making the disassembly and assembly of the widening plate more intuitive and convenient. Adjusting the effective assembly width can also ensure that the bracket is subjected to uniform force.

[0028] The second type of bracket structure includes a bracket 3 with at least two rod support positions 32 along the axial direction of the alarm traction rod 21 at its upper end. The rotating rod 211 is supported by multiple rod support positions 32, and the micro switch 23 is mounted on the bracket 3. In this structure, the base plate extends along the axial direction of the traction rod, and the bracket 3 is located below the middle section of the alarm traction rod 21. The upper end of the base plate 31 of the bracket is also integrally provided with a support plate 35, which extends along the axial direction of the alarm traction rod 21. Each support plate 35 has an upwardly protruding support arm 36 on both sides, and a rod support position 32 is provided at the top of each support arm 36. The support arms 36 on both sides are respectively limited and abut against the positioning step 12 of the housing 1, supporting the rotating rod from the middle. Combined with the lateral limitation of the positioning step, the stability of the bracket after installation is further improved, ensuring smooth rotation of the rotating rod.

[0029] During bracket assembly, the widening plates can be removed or retained along the easily foldable connection edge according to the slot width requirements of different housing sizes: retaining the widening plates on both sides results in the widest overall bracket width, suitable for large-sized housing slots; removing one side of the widening plate results in a bracket with one side for insertion into the base plate and the other side for insertion into the widening plate, resulting in a medium overall width, suitable for medium-sized housing slots; removing both sides of the widening plates results in the smallest overall bracket width, suitable for small-sized housing slots. The adjustment operation is simple and quick, with a wide range of adaptability; multiple circuit breaker sizes can be adapted by adjusting the structure of a single bracket. The bracket is prevented from detaching upwards by closing the top cover on the housing; it can be pulled out after the top cover is opened.

[0030] The specific working principle is as follows: Under normal energized conditions, the circuit current is within the rated range, the bimetallic strip is heated to a low temperature and has no obvious deformation. The end of the adjusting screw on its deformable movable end and the drive lever maintain a reserved gap and do not contact each other. The trigger lever is far away from the micro switch, the micro switch remains open, and there is no alarm output. When an overload fault occurs in the line, the excessive circuit current causes the bimetallic strip to continuously heat up. Due to its own thermal expansion characteristics, it bends towards the drive lever. The adjusting screw on the deformed movable end pushes against the drive lever, causing the rotating rod to rotate around the pivot. This causes the trigger lever on the rotating rod to swing and press the micro switch. The circuit breaker sends an overload alarm signal to the outside. At the same time, the circuit breaker maintains its original closed and conducting state, realizing the overload alarm without tripping function.

[0031] It should be noted that in the description of this utility model, all directional indicators such as up, down, front, back, etc. are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicator will also change accordingly.

[0032] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a number" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. An overload alarm non-tripping circuit breaker, comprising a housing (1) and an alarm non-tripping unit (2), wherein the alarm non-tripping unit (2) comprises an alarm traction rod (21), a bimetallic strip (22), and a micro switch (23), wherein the alarm traction rod (21) comprises a rotating rod body (211), a drive lever (212) and a trigger lever (213) disposed on the rotating rod body (211), wherein one end of the bimetallic strip (22) is fixed to the housing (1), and the other end is provided with a shaped A variable movable end (221) is positioned opposite to the drive lever (212). The micro switch (23) is located on the action path of the trigger lever (213) and connected to the alarm circuit. When the circuit is overloaded, the bimetallic strip (22) is heated and bent, and its variable movable end (221) pushes against the drive lever (212), causing the rotating rod (211) to rotate, thereby driving the trigger lever (213) to press the micro switch (23). Its characteristics are: The housing (1) has an assembly slot (11) inside, and vertical slots (111) are respectively provided on opposite sides of the assembly slot (11). A bracket (3) is vertically inserted into the assembly slot (11). The bracket (3) includes a base plate (31). A rod support position (32) is provided at the upper end of the base plate (31). The rotating rod (211) is rotatably assembled at the rod support position (32). The base plate (31) has flexible connecting edges (3) on both sides along the width direction. 3) Connect the removable widening plates (34) respectively. The outer edges of the widening plates (34) and the base plate (31) can be vertically inserted into the corresponding side slots (111). The effective assembly width of the bracket (3) can be adjusted by removing or retaining the widening plates (34). The outer edges of the widening plates (34) or the base plate (31) on both sides of the bracket (3) can be inserted into the corresponding side slots (111) respectively, so that the bracket (3) can be adapted to the assembly slots (11) of various slot width specifications.

2. The overload alarm non-tripping circuit breaker according to claim 1, characterized in that: The easily foldable connecting edge (33) is a thin-walled structure or has intermittent cuts.

3. The overload alarm non-tripping circuit breaker according to claim 1, characterized in that: A pivot protrusion (321) is provided at the rod support position (32). The rotating rod body (211) is provided with a pivot sleeve (2111). A circumferential notch (2112) is opened on the side wall of the pivot sleeve (2111). The pivot protrusion (321) is inserted into the pivot sleeve (2111) through the notch (2112) and forms a rotational fit. The two end walls of the notch (2112) can form a limiting abutment with the side wall of the pivot protrusion (321) to limit the rotation angle of the rotating rod body (211). The rotating rod body (211) is connected to the pivot protrusion (321) through a pivot (4).

4. The overload alarm non-tripping circuit breaker according to claim 1, 2, or 3, characterized in that: At least two brackets (3) are spaced apart along the axial direction of the alarm traction rod (21). Each bracket (3) has a rod support position (32) at its upper end. The rotating rod (211) is supported by the rod support positions (32) of each bracket (3). The housing (1) is provided with multiple assembly slots (11). The micro switch (23) is mounted on one of the brackets (3).

5. The overload alarm non-tripping circuit breaker according to claim 4, characterized in that: The width direction of the base plate (31) of each bracket (3) is set along the axial direction of the vertical alarm traction rod (21).

6. The overload alarm non-tripping circuit breaker according to claim 1, 2, or 3, characterized in that: The bracket (3) is provided, and at least two rod support positions (32) are provided on the upper end of the bracket (3) along the axial direction of the alarm traction rod (21). The rotating rod body (211) is supported by multiple rod support positions (32). The micro switch (23) is installed on the bracket (3).

7. The overload alarm non-tripping circuit breaker according to claim 6, characterized in that: The base plate (31) of the bracket (3) is arranged along the axial direction of the alarm traction rod (21) in the width direction.

8. The overload alarm non-tripping circuit breaker according to claim 6, characterized in that: The bracket (3) is located below the middle section of the alarm traction rod (21). The upper end of the base plate (31) of the bracket (3) is also provided with a support plate (35). The support plate (35) extends axially along the alarm traction rod (21), and the support plate (35) is provided with upward protruding support arms (36) on both sides. The top of each support arm (36) is provided with a rod support position (32). The support arms (36) on both sides are respectively limited and abut against the positioning step (12) of the housing (1).

Images