Miniature residual-current circuit breaker

Abstract

The utility model relates to a miniature electric leakage circuit breaker, which comprises a shell, an operating mechanism, a moving contact, a static contact, an arc extinguish chamber and an electric leakage tripper, the operating mechanism comprises a handle, a jump pin, a U-shaped connecting rod arranged between the handle and the jump pin, a lock catch which is rotatably arranged in the shell and is matched with the jump pin, a contact frame which is rotatably arranged in the shell and is used for driving the moving contact to act, and a torsional spring arranged between the lock catch and the contact frame; the tripping pull rod is arranged in the shell corresponding to the position between the electric leakage tripper and the lock catch in a sliding mode, one end of the tripping pull rod is connected to the lock catch, the tripping pull rod is provided with a U-shaped bending part matched with an ejector rod of the electric leakage tripper, the ejector rod is provided with a boss matched with the U-shaped bending part, and the boss is connected with the electric leakage tripper. And the U-shaped bending part is clamped on the boss, so that the tripping pull rod is in linkage fit with an ejector rod of the electric leakage tripper. The electric leakage tripping device has the advantages of simple structure, stable and reliable performance, sensitive electric leakage tripping action 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. The existing small leakage circuit breakers include a housing, an operating mechanism, a moving contact, a static contact, an arc extinguishing chamber, a leakage release, and a release rod. The structure design of the release rod of the existing small leakage circuit breaker is unreasonable, and the release rod and the leakage release are prone to loosening and falling off, resulting in unreliable leakage release action of the small circuit breaker, and even failure of the release function. In addition, the small leakage circuit breaker also has the defects of complex structure, unreliable performance, and inconvenient assembly. 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, sensitive leakage tripping action 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 releaser. 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 matched with the trip button, a contact frame rotatably arranged in the shell and used to drive the moving contact to move, a torsion spring arranged between the lock button and the contact frame, and a trip rod slidably arranged in the shell at a position corresponding to the leakage releaser and the lock button. One end of the trip rod is connected to the lock button, and a U-shaped bending portion is arranged on the trip rod to match with the top rod of the leakage releaser. A boss matching with the U-shaped bending portion is arranged on the top rod, and the U-shaped bending portion is engaged on the boss to form a linkage match between the trip rod and the top rod of the leakage releaser.

[0005] The beneficial effects of the above structure are: the tripping rod is slidably arranged in the housing, so that the tripping rod can be reliably moved in the housing, and the tripping rod is engaged with the top rod of the leakage release through the U-shaped bending part, so that the assembly of the tripping rod and the leakage release is convenient, the assembly efficiency is higher, and the transmission between the tripping rod and the top rod of the leakage release is more reliable, and the tripping action is more sensitive and reliable. Therefore, the small leakage circuit breaker has the advantages of simple structure, stable and reliable performance, sensitive leakage tripping action, and convenient assembly.

[0006] In particular, the other end of the tripping rod has a guide rod portion matched with the housing, a guide groove matched with the guide rod portion is provided in the housing, the guide rod portion is inserted in the guide groove, and the guide rod portion moves with the tripping rod and reciprocates in the guide groove. The guide groove of the housing guides the tripping rod, thereby ensuring that the tripping rod can reliably move in the housing, so that the leakage release can reliably drive the locking action through the tripping rod, which is beneficial to improving the working reliability of the small circuit breaker.

[0007] In particular, the lock is provided with a positioning groove matched with the release rod, one end of the release rod is engaged in the positioning groove, and the lock and the release rod are linked. The release rod and the lock are connected by a snap-fit ​​mode, so that the assembly of the lock and the release rod is convenient, the assembly efficiency is higher, and the transmission of the lock and the release rod can be ensured to be more reliable.

[0008] In particular, one end of the jumper has a locking piece part that matches the lock buckle, and the lock buckle is provided with a locking groove that matches the locking piece part. The locking piece part moves with the jumper and is engaged in the locking groove, and forms a limit fit between the locking piece part and the lock buckle. The jumper is engaged with the lock buckle through the locking piece part, so that the lock buckle and the jumper can be reliably locked, which is beneficial to improving the working reliability of the small leakage circuit breaker.

[0009] In particular, the lock is provided with a positioning boss matched with the torsion spring, the torsion spring is sleeved on the positioning boss, one end of the torsion spring is engaged with the limit plate of the contact frame, and the other end of the torsion spring is engaged with the limit block of the lock. The torsion spring is engaged between the contact frame and the lock, so that the assembly of the torsion spring, the contact frame and the lock is convenient, and the lock can be ensured to operate reliably, which is conducive to improving the working reliability of the small leakage circuit breaker. 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 a release rod according to an embodiment of the utility model. DETAILED DESCRIPTION

[0013] like Figures 1 to 3 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 release 14. 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 21 and the trip button 22, a lock button 24 rotatably arranged in the housing 10 and matched 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, and a contact frame 25 arranged in the lock button 24. A torsion spring 26 between the contact frame 25 and a tripping rod 27 slidably arranged in the housing 10 at a position corresponding to the leakage release 14 and the lock 24, one end of the tripping rod 27 is connected to the lock 24, and a U-shaped bending portion 271 matching with the top rod 141 of the leakage release 14 is provided on the tripping rod 27, and a boss 142 matching with the U-shaped bending portion 271 is provided on the top rod 141, and the U-shaped bending portion 271 is engaged on the boss 142, and the tripping rod 27 and the top rod 141 of the leakage release 14 are linked to each other. The other end of the release rod 27 has a guide rod portion 272 that matches the housing 10. The housing 10 is provided with a guide groove 101 that matches the guide rod portion 272. The guide rod portion 272 is inserted into the guide groove 101. The guide rod portion 272 moves with the release rod 27 and reciprocates in the guide groove 101. The guide groove of the housing guides the release rod, thereby ensuring that the release rod can reliably move in the housing, so that the leakage release can reliably drive the lock action through the release rod, which is beneficial to improving the working reliability of the small circuit breaker. The lock 24 is provided with a positioning groove 241 that matches the release rod 27. One end of the release rod 27 is engaged in the positioning groove 241, and the lock 24 and the release rod 27 are linked. The release rod and the lock are connected by a snap-fitting manner, so that the assembly of the lock and the release rod is convenient, the assembly efficiency is higher, and the transmission of the lock and the release rod can be ensured to be more reliable.

[0014] like Figure 1As shown, one end of the jumper 22 has a locking piece 221 that matches the lock 24, and the lock 24 is provided with a locking groove 242 that matches the locking piece 221. The locking piece 221 moves with the jumper 22 and is engaged in the locking groove 242, and constitutes a limiting match between the locking piece 221 and the lock 24. The jumper is engaged with the lock through the locking piece, so that the lock and the jumper can be reliably locked, which is beneficial to improving the working reliability of the small leakage circuit breaker. The lock 24 is provided with a positioning boss 243 that matches the torsion spring 26, and the torsion spring 26 is sleeved on the positioning boss 243. One end of the torsion spring 26 is engaged with the limiting piece 251 of the contact frame 25, and the other end of the torsion spring 26 is engaged with the limiting block 244 of the lock 24. The torsion spring is clamped between the contact frame and the lock, so that the assembly of the torsion spring, the contact frame and the lock is convenient, and the lock can be ensured to operate reliably, which is beneficial to improving the working reliability of the small leakage circuit breaker.

[0015] The tripping rod is slidably arranged in the housing, so that the tripping rod can be reliably moved in the housing, and the tripping rod is engaged with the top rod of the leakage release through the U-shaped bending part, so that the assembly of the tripping rod and the leakage release is convenient, the assembly efficiency is higher, and the transmission of the tripping rod and the top rod of the leakage release is more reliable, and the tripping action is more sensitive and reliable. Therefore, the small leakage circuit breaker has the advantages of simple structure, stable and reliable performance, sensitive leakage tripping action, 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: 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 matched 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 trip rod slidably arranged in the shell at a position corresponding to the leakage releaser and the lock button. One end of the trip rod is connected to the lock button, and a U-shaped bending portion matching with the top rod of the leakage releaser is arranged on the trip rod. A boss matching with the U-shaped bending portion is arranged on the top rod. The U-shaped bending portion is clamped on the boss, and constitutes a linkage cooperation between the trip rod and the top rod of the leakage releaser.

2. The miniature leakage circuit breaker according to claim 1, characterized in that: The other end of the release rod has a guide rod part matched with the shell, and the shell is provided with a guide groove matched with the guide rod part. The guide rod part is inserted in the guide groove, and the guide rod part moves with the release rod and slides back and forth in the guide groove.

3. The miniature leakage circuit breaker according to claim 1 or 2, characterized in that: The lock buckle is provided with a positioning groove matched with the release pull rod, and one end of the release pull rod is engaged in the positioning groove, and the lock buckle and the release pull rod are linked.

4. The miniature leakage circuit breaker according to claim 1 or 2, characterized in that: One end of the jump buckle has a locking piece part that matches the lock buckle, and the lock buckle is provided with a locking groove that matches the locking piece part. The locking piece part moves with the jump buckle and is engaged in the locking groove, and constitutes a limiting match between the locking piece part and the lock buckle.

5. The miniature leakage circuit breaker according to claim 1 or 2, characterized in that: The lock buckle is provided with a positioning boss matched with the torsion spring, the torsion spring is sleeved on the positioning boss, one end of the torsion spring is engaged with the limiting piece of the contact frame, and the other end of the torsion spring is engaged with the limiting block of the lock buckle.

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