Miniature residual-current circuit breaker

Abstract

The utility model relates to a miniature residual-current circuit breaker, which comprises a shell, an operating mechanism, a moving contact, a static contact, an arc extinguish chamber and a residual-current release, a residual-current indicating mechanism is arranged on the shell corresponding to a pull rod of the residual-current release, and the residual-current indicating mechanism comprises a residual-current indicating piece and a pressure spring arranged between the residual-current indicating piece and the shell. One end of the electric leakage indicating piece is provided with a positioning hole matched with a pull rod of the electric leakage tripping device, the pull rod is provided with a positioning boss matched with the positioning hole, the positioning boss is clamped in the positioning hole to form clamping matching of the pull rod and the electric leakage indicating piece, the other end of the electric leakage indicating piece is provided with an indicating part, and the indicating part is provided with an elastic part. And an indicating hole is arranged on the shell corresponding to the indicating part. The electric leakage indicator has the advantages of simple structure, stable and reliable performance, reliable electric leakage indication and convenience in assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a small leakage circuit breaker. Background Art

[0002] At present, small circuit breakers, also known as miniature circuit breakers, are suitable for overload and short-circuit protection of AC 50 / 60Hz rated voltage 230 / 400V and rated current not exceeding 125A lines. They can also be used for infrequent operation conversion of lines under normal circumstances. Small circuit breakers are mainly used in various places such as industry, commerce, high-rise and residential buildings. Small leakage circuit breakers are switches that can automatically operate when the leakage current in the circuit exceeds a predetermined value, which can protect the safety of people and electrical appliances. Existing small leakage circuit breakers only have a leakage indication function. When leakage occurs in the main circuit, the leakage indicator changes color following the action of the actuator, thereby achieving the purpose of protecting the circuit. However, the structural design of the leakage indication mechanism of the existing small leakage circuit breaker is relatively complex, the assembly is relatively cumbersome, and the leakage indication performance is unreliable. Summary of the invention

[0003] The utility model aims to overcome the defects of the prior art and provide a small leakage circuit breaker with simple structure, stable and reliable performance, reliable leakage indication and convenient assembly.

[0004] To achieve the above-mentioned purpose, the utility model adopts a small leakage circuit breaker, including a shell, an operating mechanism, a moving contact, a static contact, an arc extinguishing chamber, and a leakage release. A leakage indication mechanism is arranged on the shell at a pull rod corresponding to the leakage release. The leakage indication mechanism includes a leakage indicator and a compression spring arranged between the leakage indicator and the shell. A positioning hole matching the pull rod of the leakage release is arranged at one end of the leakage indicator. A positioning boss matching the positioning hole is arranged on the pull rod. The positioning boss is engaged in the positioning hole and constitutes a snap-fit ​​fit between the pull rod and the leakage indicator. The other end of the leakage indicator has an indication part, and an indication hole is arranged on the shell at a position corresponding to the indication part.

[0005] The beneficial effect of the above structure is that: a leakage indication mechanism is arranged on the housing, the structural design of the leakage indication mechanism is simple, and the leakage indication is more reliable. When leakage occurs in the line, the pull rod of the leakage release drives the positioning boss to move, the positioning boss is separated from the positioning hole of the leakage indicator, the leakage indicator loses the restriction of the positioning boss, the compression spring drives the leakage indicator to move, and the indication part of the leakage indicator extends out of the indication hole of the housing, thereby realizing the leakage indication of the small leakage circuit breaker. Therefore, the small leakage circuit breaker has the advantages of simple structure, stable and reliable performance, reliable leakage indication, and convenient assembly.

[0006] In particular, a guide slide groove matched with the leakage indicator is provided in the housing, and the leakage indicator is slidably arranged in the guide slide groove, and a sliding connection is formed between the leakage indicator and the housing. The leakage indicator is slidably arranged in the guide slide groove, so that the leakage indicator can be reliably operated in the housing, which is conducive to improving the reliability of the leakage indication action of the leakage indicator.

[0007] In particular, a positioning block is provided in the housing at a position corresponding to the compression spring, one end of the compression spring contacts the positioning block, a boss matched with the compression spring is provided on the leakage indicator, and the other end of the compression spring is engaged with the boss. The compression spring is engaged between the positioning block of the housing and the boss of the leakage indicator, thereby facilitating the assembly of the compression spring, the leakage indicator and the housing, achieving higher assembly efficiency and more reliable and sensitive leakage indication of the leakage indicator.

[0008] In particular, the operating mechanism includes a handle rotatably arranged on the shell, a trip button rotatably arranged in the shell, a U-shaped connecting rod arranged between the handle and the trip button, a lock button rotatably arranged in the shell and cooperating with the trip button, a contact frame rotatably arranged in the shell and used to drive the moving contact, a torsion spring arranged between the lock button and the contact frame, and a tripping pull rod arranged between the pull rod of the leakage releaser and the lock button. A switch-on and switch-off indicator is rotatably arranged at the corresponding position of the trip button in the shell, one end of the switch-on and switch-off indicator has an indicator plate, a switch-on and switch-off indicator hole is arranged at the corresponding position of the indicator plate on the shell, and the other end of the switch-on and switch-off indicator is arranged with an arc guide hole. A shift rod is linked to the trip button, one end of the shift rod is inserted into the arc guide hole, the shift rod moves with the trip button and reciprocates in the arc guide hole, and constitutes a linkage cooperation between the switch-on and switch-off indicator and the shift rod. The trip button toggles the opening and closing indicator through the lever, thereby realizing the opening and closing indication of the opening and closing indicator. The structure is simple in design, and the opening and closing indication action is more reliable and sensitive.

[0009] In particular, a positioning shaft is provided in the housing corresponding to the opening and closing indicator, a positioning hole matching the positioning shaft is provided on the opening and closing indicator, the positioning shaft is inserted into the positioning hole, and forms a rotational connection and matching between the opening and closing indicator and the positioning shaft. The opening and closing indicator is engaged with the positioning shaft of the housing, so as to facilitate the assembly of the opening and closing indicator and the housing, make the assembly more convenient, and ensure that the opening and closing indicator can reliably operate on the positioning shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a three-dimensional diagram of the internal structure of an embodiment of the utility model.

[0011] Figure 2 It is the front view of the internal structure of the embodiment of the utility model.

[0012] Figure 3It is a three-dimensional diagram of the leakage indication mechanism of the embodiment of the utility model.

[0013] Figure 4 It is a three-dimensional diagram of the opening and closing indicator of an embodiment of the utility model. DETAILED DESCRIPTION

[0014] like Figures 1 to 4 As shown, the embodiment of the utility model is a small leakage circuit breaker, including a housing 10, an operating mechanism 20, a moving contact 11, a static contact 12, an arc extinguishing chamber 13, and a leakage releaser 14. A leakage indication mechanism 30 is arranged on the housing corresponding to the pull rod 141 of the leakage releaser 14. The leakage indication mechanism 30 includes a leakage indicator 31 and a compression spring 32 arranged between the leakage indicator 31 and the housing 10. One end of the leakage indicator 31 is provided with a positioning hole 311 that matches the pull rod 141 of the leakage releaser 14. The pull rod 141 is provided with a positioning boss 142 that matches the positioning hole 311. The positioning boss 142 is engaged in the positioning hole 311 and constitutes a snap-fitting fit between the pull rod 141 and the leakage indicator 31. The other end of the leakage indicator 31 has an indication portion 312, and an indication hole 101 is arranged on the housing 10 corresponding to the indication portion 312. The housing 10 is provided with a guide slide groove 102 matched with the leakage indicator 31, and the leakage indicator 31 is slidably arranged in the guide slide groove 102, and constitutes a sliding connection and cooperation between the leakage indicator 31 and the housing 10. The leakage indicator is slidably arranged in the guide slide groove, so that the leakage indicator can be reliably operated in the housing, which is conducive to improving the reliability of the leakage indication action of the leakage indicator. A positioning block 103 is arranged in the housing 10 corresponding to the compression spring 32, one end of the compression spring 32 abuts on the positioning block 103, and a boss 313 matched with the compression spring 32 is arranged on the leakage indicator 31, and the other end of the compression spring 32 is engaged with the boss 313. The compression spring is engaged between the positioning block of the housing and the boss of the leakage indicator, so as to facilitate the assembly of the compression spring, the leakage indicator and the housing, the assembly efficiency is higher, and the leakage indication action of the leakage indicator is more reliable and sensitive.

[0015] like Figure 1 , 24, the operating mechanism 20 includes a handle 21 rotatably arranged on the housing 10, a trip button 22 rotatably arranged in the housing 10, a U-shaped connecting rod 23 arranged between the handle 10 and the trip button 22, a lock button 24 rotatably arranged in the housing 10 and cooperating with the trip button 22, a contact frame 25 rotatably arranged in the housing 10 and used to drive the moving contact 11 to move, a torsion spring 26 arranged between the lock button 24 and the contact frame 25, and a tripping rod 27 arranged between the pull rod 141 of the leakage release 14 and the lock button 24. The housing 10 corresponds to the trip button 22. A switch-on / off indicator 28 is rotatably arranged at 2 positions, one end of the switch-on / off indicator 28 has an indicator plate 281, a switch-on / off indicator hole 104 is arranged on the housing 10 corresponding to the indicator plate 281, an arc-shaped guide hole 282 is arranged on the other end of the switch-on / off indicator 28, a lever 221 is arranged on the jumper 22 in linkage, one end of the lever 221 is inserted into the arc-shaped guide hole 282, the lever 221 moves with the jumper 22 and reciprocates in the arc-shaped guide hole 282, and forms a linkage cooperation between the switch-on / off indicator 28 and the lever 221. The jumper toggles the switch-on / off indicator through the lever, thereby realizing the switch-on / off indication of the switch-on / off indicator, the structural design is simple, and the switch-on / off indication action is more reliable and sensitive. A positioning shaft 105 is provided in the housing 10 corresponding to the opening and closing indicator 28, and a positioning hole 283 matching the positioning shaft 105 is provided on the opening and closing indicator 28. The positioning shaft 105 is inserted into the positioning hole 283, and forms a rotational connection and cooperation between the opening and closing indicator 28 and the positioning shaft 105. The opening and closing indicator is engaged with the positioning shaft of the housing, so as to facilitate the assembly of the opening and closing indicator and the housing, and the assembly is more convenient, and it can ensure that the opening and closing indicator can reliably operate on the positioning shaft.

[0016] A leakage indication mechanism is arranged on the housing, and the structural design of the leakage indication mechanism is simple, and the leakage indication is more reliable. When leakage occurs in the line, the pull rod of the leakage releaser drives the positioning boss to move, and the positioning boss is separated from the positioning hole of the leakage indicator. The leakage indicator loses the restriction of the positioning boss, and the compression spring drives the leakage indicator to move, and the indication part of the leakage indicator extends out of the indication hole of the housing, thereby realizing the leakage indication of the small leakage circuit breaker. Therefore, the small leakage circuit breaker has the advantages of simple structure, stable and reliable performance, reliable leakage indication, and convenient assembly.

Claims

1. A small leakage circuit breaker, comprising a housing, an operating mechanism, a moving contact, a static contact, an arc extinguishing chamber, and a leakage release, characterized in that: A leakage indication mechanism is arranged on the shell at the pull rod corresponding to the leakage releaser, and the leakage indication mechanism includes a leakage indicator and a compression spring arranged between the leakage indicator and the shell. A positioning hole matching the pull rod of the leakage releaser is arranged at one end of the leakage indicator, and a positioning boss matching the positioning hole is arranged on the pull rod. The positioning boss is engaged in the positioning hole and constitutes a snap-fit ​​fit between the pull rod and the leakage indicator. The other end of the leakage indicator has an indication part, and an indication hole is arranged on the shell at the corresponding indication part.

2. The miniature leakage circuit breaker according to claim 1, characterized in that: A guide sliding groove matched with the leakage indicator is arranged in the shell, and the leakage indicator is slidably arranged in the guide sliding groove, and a sliding connection is formed between the leakage indicator and the shell.

3. The miniature leakage circuit breaker according to claim 1 or 2, characterized in that: A positioning block is arranged in the shell at a position corresponding to the compression spring, one end of the compression spring abuts against the positioning block, a boss matched with the compression spring is arranged on the leakage indicator, and the other end of the compression spring is clamped on the boss.

4. The miniature leakage circuit breaker according to claim 1 or 2, characterized in that: The operating mechanism includes a handle rotatably arranged on the shell, a trip button rotatably arranged in the shell, a U-shaped connecting rod arranged between the handle and the trip button, a lock button rotatably arranged in the shell and cooperating with the trip button, a contact frame rotatably arranged in the shell and used to drive the moving contact, a torsion spring arranged between the lock button and the contact frame, and a tripping pull rod arranged between the pull rod of the leakage releaser and the lock button. A switch-on and switch-off indicator is rotatably arranged at the corresponding position of the trip button in the shell, one end of the switch-on and switch-off indicator has an indicator plate, a switch-on and switch-off indicator hole is arranged at the corresponding position of the indicator plate on the shell, and the other end of the switch-on and switch-off indicator is arranged with an arc guide hole. A shifting rod is linked to the trip button, one end of the shifting rod is inserted into the arc guide hole, the shifting rod moves with the trip button and reciprocates in the arc guide hole, and constitutes a linkage cooperation between the switch-on and switch-off indicator and the shifting rod.

5. The miniature residual current circuit breaker according to claim 4, characterized in that: A positioning shaft is arranged in the shell corresponding to the opening and closing indicator, a positioning hole matching with the positioning shaft is arranged on the opening and closing indicator, the positioning shaft is inserted in the positioning hole, and a rotational connection is formed between the opening and closing indicator and the positioning shaft.

Images