Variable thermomagnetic release circuit breaker

Abstract

The utility model discloses a circuit breaker with a variable thermomagnetic release. The circuit breaker comprises a movable contact, the thermomagnetic release, a wire outlet plate and a conductive element, the movable contact piece is connected with the thermomagnetic release; the thermomagnetic release comprises a support, a bimetallic strip, a movable iron core, a connecting element, a soft connecting piece and a dismounting part. The dismounting part comprises a pair of outer static iron cores, an inner static iron core and a magnet exciting coil. The thermomagnetic release comprises a support, a bimetallic strip, a movable iron core, a connecting element, a flexible connecting piece and a detachable dismounting part, the dismounting part is composed of an outer static iron core, an inner static iron core and a magnet exciting coil, the dismounting part is detachably connected with the support through a screw and can be dismounted according to the actual situation, and when the thermomagnetic release is applied to the low-current environment, the dismounting part can be installed; when the device is applied to a large-current environment, the connection of the lead can be adjusted by dismounting the dismounting part, so that the device can cope with the large-current environment. The utility model has the advantages of being capable of being applied to a heavy current environment and wide in application range.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a circuit breaker with a variable thermal magnetic release. Background Art

[0002] Thermal magnetic releases are usually used in small current circuit breakers. They use thermal magnetic releases to achieve long-time delay overload protection and instantaneous circuit breaking protection of the circuit breaker. The working principle of the thermal trip system is mainly realized through two methods: direct heating and indirect heating. The direct heating method works by directly carrying current and heating the double metal to bend; the indirect heating method works by transferring the current-carrying heat of the thermal element to the double metal to cause heating and bending.

[0003] The thermal tripping system of existing small circuit breakers usually adopts a direct thermal structure, in which the current passes directly through the bimetallic strip. Once the current flowing through is large, it is very easy to become unstable in the delay characteristics. The main reason for this is the temperature rise, which affects the stability and reliability of the overload protection. Therefore, the existing thermal magnetic release is usually not well applied to high-current circuit breakers.

[0004] Of course, there are some thermal-magnetic releases on the market that can be used in high-current circuit breakers. However, their structure generally directly integrates the release and the circuit breaker body into an integrated structure. The overall structure is relatively complex, with poor interchangeability and a cumbersome assembly process, which is very unfavorable for subsequent actual production, storage and management.

[0005] Therefore, the existing thermal magnetic release has the problem of not being well applied to high current circuit breakers. Utility Model Content

[0006] The purpose of the present invention is to provide a circuit breaker with a variable thermal magnetic release. The present invention has the advantages of being applicable to high current environments and having a wide range of applications.

[0007] The technical solution of the present utility model: a variable thermal-magnetic release circuit breaker, comprising a moving contact, a thermal-magnetic release and an outlet plate, and a conductive element; the moving contact is connected to the thermal-magnetic release; the thermal-magnetic release comprises a bracket, a bimetallic strip vertically arranged in the middle of the bracket, a moving iron core movably arranged on the front side of the bracket, a connecting element arranged below the bracket and connected to the bimetallic strip, a soft connector arranged on the rear side of the bracket, and a disassembly portion detachably arranged on the rear side of the bracket and connected to the soft connector; the disassembly portion comprises a pair of outer static iron cores detachably connected to the bracket by screws, an inner static iron core correspondingly arranged in the outer static iron core, and an excitation coil passing between the outer static iron cores and located on the rear side of the inner static iron core.

[0008] In the aforementioned variable thermal-magnetic release circuit breaker, a detachable mounting post is provided inside the outer static iron core, and the excitation coil is sleeved on the mounting post; the mounting post is a stepped cylindrical structure with thin ends and a thick middle, and the two ends of the mounting post are inserted into corresponding mounting holes opened on the outer static iron core.

[0009] In the aforementioned variable thermal-magnetic release circuit breaker, the excitation coil is spiral-shaped, one end of the excitation coil is connected to the conductive element, and the other end is connected to the flexible connector.

[0010] In the aforementioned variable thermal magnetic release circuit breaker, the inner static iron core is U-shaped, with screw holes for fixing the outer static iron core on both sides of the upper end of the inner static iron core and a connection hole for connecting to the connection element at the lower end.

[0011] In the aforementioned variable thermal-magnetic release circuit breaker, the inner static iron core, the outer static iron core, the mounting column, the moving iron core, and the air gap between the inner static iron core and the moving iron core form a magnetic circuit.

[0012] The aforementioned variable thermal-magnetic release circuit breaker is further provided with a detachable resistance unit; the movable contact piece is connected to the thermal-magnetic release via a wire through the resistance unit; the resistance unit is a resistance block, and the resistance unit is provided with a variety of different specifications and shapes.

[0013] Compared with the prior art, the thermal magnetic release of the present application includes a bracket, a bimetallic strip, a moving iron core, a connecting element, a soft connector and a detachable disassembly part. The disassembly part is composed of an outer static iron core, an inner static iron core and an excitation coil. The entire disassembly part adopts a detachable structure, and the disassembly part is detachably connected to the bracket by screws, so that the entire disassembly part can be disassembled according to actual conditions. When applied to an ordinary low-current environment, the disassembly part can be installed and the circuit breaker function can be realized through the excitation coil; when it needs to be applied to a high-current environment, the entire disassembly part can be directly removed by removing the screws, and then the connection of the wires can be adjusted according to actual conditions, so that it can cope with the use of high current.

[0014] Therefore, the utility model has the advantages of being applicable to large current environments and having a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the utility model Figure 1 ;

[0016] Figure 2 This is a schematic diagram of the structure of the utility model Figure 2 .

[0017] The markings in the accompanying drawings are: 1-bracket, 2-bimetallic strip, 3-moving iron core, 4-soft connector, 5-outer static iron core, 6-inner static iron core, 7-excitation coil, 71-mounting column, 8-connecting element, 91-moving contact piece, 92-conductive element, 93-resistance unit, 94-wire. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0019] Example. Variable thermal magnetic release circuit breaker, such as Figure 1-2 As shown, it includes a moving contact piece 91, a thermal magnetic release and an outlet plate, and a conductive element 92; the moving contact piece 91 is connected to the thermal magnetic release; the thermal magnetic release includes a bracket 1, a bimetallic strip 2 vertically arranged in the middle of the bracket 1, a moving iron core 3 movably arranged on the front side of the bracket 1, a connecting element 8 arranged below the bracket 1 and connected to the bimetallic strip 2, a soft connector 4 arranged on the rear side of the bracket 1 and a disassembly part detachably arranged on the rear side of the bracket 1 and connected to the soft connector 4; the disassembly part includes a pair of outer static iron cores 5 detachably connected to the bracket 1 by screws, an inner static iron core 6 correspondingly arranged in the outer static iron core 5 and an excitation coil 7 passing through the outer static iron cores 5 and located on the rear side of the inner static iron core 6.

[0020] The connecting element 8 is a conductive element or a thermal element.

[0021] The bimetallic strip 2 is riveted to the connecting element 8;

[0022] A detachable mounting post 71 is provided inside the outer static iron core 5, and the excitation coil 7 is sleeved on the mounting post 71; the mounting post 71 is a stepped cylindrical structure with thin ends and a thick middle, and the two ends of the mounting post 71 are inserted into the corresponding mounting holes opened on the outer static iron core 5.

[0023] The excitation coil 7 is spiral-shaped, one end of the excitation coil 7 is connected to the conductive element 92 , and the other end is connected to the flexible connector 4 .

[0024] The inner static iron core 6 is U-shaped, and screw holes for fixing the outer static iron core 5 are provided on both sides of the upper end of the inner static iron core 6, and a connecting hole for connecting with the connecting element 8 is provided at the lower end.

[0025] The inner static iron core 6 , the outer static iron core 5 , the mounting column 71 , the movable iron core 3 , and the air gap between the inner static iron core 6 and the movable iron core 3 form a magnetic circuit.

[0026] A detachable resistance unit 93 is also provided; the movable contact piece 91 is connected to the thermal magnetic release through a wire 94 via the resistance unit 93; the resistance unit 93 is a resistance block, and the resistance unit 93 has a variety of different specifications and shapes;

[0027] By adding the resistance unit 93, the overall resistance is increased, thereby achieving current limiting. The resistance unit 93 of different specifications can be selected according to actual conditions to meet the application of different current scenarios.

[0028] The current path includes a connecting element 8, a bimetallic strip 2, a flexible connector 4, an excitation coil 7, and a conductive element 92;

[0029] Or connecting element 8, soft connecting part 4, excitation coil 7, conductive element 92.

[0030] One end of the flexible connector 4 is connected to the excitation coil 7 , and the other end is connected to the bimetallic strip 2 or the connecting element 8 .

Claims

1. Variable thermal magnetic release circuit breaker, characterized by: The invention comprises a movable contact piece (91), a thermal magnetic release, an outlet plate and a conductive element (92); the movable contact piece (91) is connected to the thermal magnetic release; the thermal magnetic release comprises a bracket (1), a bimetallic strip (2) vertically arranged in the middle of the bracket (1), a movable iron core (3) movably arranged on the front side of the bracket (1), a connecting element (8) arranged below the bracket (1) and connected to the bimetallic strip (2), a soft connector (4) arranged on the rear side of the bracket (1) and a disassembly portion detachably arranged on the rear side of the bracket (1) and connected to the soft connector (4); the disassembly portion comprises a pair of outer static iron cores (5) detachably connected to the bracket (1) by screws, an inner static iron core (6) correspondingly arranged in the outer static iron core (5) and an excitation coil (7) passing between the outer static iron cores (5) and located on the rear side of the inner static iron core (6).

2. The variable thermal magnetic release circuit breaker according to claim 1, characterized in that: A detachable mounting post (71) is provided inside the outer static iron core (5), and the excitation coil (7) is sleeved on the mounting post (71); the mounting post (71) is a stepped cylindrical structure with thin ends and a thick middle, and the two ends of the mounting post (71) are inserted into corresponding mounting holes provided on the outer static iron core (5).

3. The variable thermal magnetic release circuit breaker according to claim 1, characterized in that: The excitation coil (7) is spiral-shaped, one end of the excitation coil (7) is connected to the conductive element (92), and the other end is connected to the flexible connector (4).

4. The variable thermal magnetic release circuit breaker according to claim 1, characterized in that: The inner static iron core (6) is U-shaped, and screw holes for fixing the outer static iron core (5) are provided on both sides of the upper end of the inner static iron core (6), and a connection hole for connecting with the connection element (8) is provided at the lower end.

5. The variable thermal magnetic release circuit breaker according to claim 2, characterized in that: The inner static iron core (6), the outer static iron core (5), the mounting column (71), the moving iron core (3), and the air gap between the inner static iron core (6) and the moving iron core (3) form a magnetic circuit.

6. The variable thermal-magnetic release circuit breaker according to claim 1, characterized in that: A detachable resistance unit (93) is also provided; the movable contact piece (91) is connected to the thermal magnetic release via a wire (94) through the resistance unit (93); the resistance unit (93) is a resistance block, and the resistance unit (93) is provided with a variety of different specifications and shapes.

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