Thermomagnetic release circuit breaker with detachable excitation coil

Abstract

The invention discloses a thermomagnetic release circuit breaker with a detachable excitation coil. The thermomagnetic release circuit breaker comprises a movable contact, a 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 device has the advantages of being capable of being applied to a large-current environment and wide in application range.

Description

Technical Field

[0001] The invention relates to the technical field of circuit breakers, in particular to a thermal magnetic release circuit breaker with a detachable excitation coil. Background Art

[0002] Thermal magnetic releases are usually used in small current circuit breakers. They use thermal magnetic releases to achieve long-delay overload protection and instantaneous circuit breaking protection of circuit breakers. The working principle of the thermal trip system is mainly achieved through direct heating and indirect heating. The direct heating type works through the direct current-carrying heat bending of the bimetal; the indirect heating type works by transferring the current-carrying heat of the thermal element to the bimetal to cause heat bending.

[0003] The thermal release system of the existing small circuit breaker usually adopts a direct heating structure, and the current directly passes through the bimetallic strip. Once the current flowing through is large, it is very easy to have unstable delay characteristics. The main reason for this is the temperature rise, which affects the stability and reliability of the overload protection. It can be seen that 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, but their structure is generally that the release and the circuit breaker body are directly integrated into an integrated structure. The overall structure is relatively complex, the interchangeability is poor, and the assembly process is cumbersome, which is very unfavorable for subsequent actual production, storage and management.

[0005] Therefore, the existing thermal magnetic release has the problem that it cannot be well applied to high current circuit breakers. Summary of the invention

[0006] The object of the present invention is to provide a thermal magnetic release circuit breaker with a detachable excitation coil. The present invention has the advantages of being applicable to a large current environment and having a wide range of applications.

[0007] The technical solution of the present invention is as follows: a thermal-magnetic release circuit breaker with a detachable excitation coil, comprising a moving contact piece, a thermal-magnetic release and an outlet plate, and a conductive element; the moving contact piece 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 and assembly part detachably arranged on the rear side of the bracket and connected to the soft connector; the disassembly and assembly part 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 penetrated between the outer static iron cores and located on the rear side of the inner static iron core.

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

[0009] In the aforementioned thermal-magnetic release circuit breaker with a detachable excitation coil, 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 thermal magnetic release circuit breaker with detachable excitation coil, the inner static iron core is U-shaped, and screw holes for fixing the outer static iron core are provided on both sides of the upper end of the inner static iron core, and a connecting hole for connecting to the connecting element is provided at the lower end.

[0011] In the aforementioned thermal-magnetic release circuit breaker with detachable excitation coil, 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 thermal-magnetic release circuit breaker with detachable excitation coil is also provided with a detachable resistance unit; the movable contact piece is connected to the thermal-magnetic release through a wire via 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 present invention 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 The structure of the present invention is schematically shown in FIG. Figure 1 ;

[0016] Figure 2 The structure of the present invention is schematically shown in FIG. 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 is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0019] Embodiment. A thermal magnetic release circuit breaker with a detachable excitation coil, 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 and assembly part detachably arranged on the rear side of the bracket 1 and connected to the soft connector 4; the disassembly and assembly 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 column 71 is provided inside the outer static iron core 5, and the excitation coil 7 is sleeved on the mounting column 71; the mounting column 71 is a stepped cylindrical structure with thin ends and a thick middle, and the two ends of the mounting column 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 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.

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

[0027] By adding the resistance unit 93, the overall resistance is increased to achieve current limiting. Resistance units 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. A thermal magnetic release circuit breaker with a detachable excitation coil, characterized in that: The invention comprises a moving contact piece (91), a thermal magnetic release, an outlet plate and a conductive element (92); the moving 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 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 flexible connector (4) arranged on the rear side of the bracket (1) and a disassembly and assembly part detachably arranged on the rear side of the bracket (1) and connected to the flexible connector (4); the disassembly and assembly part 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) penetrating between the outer static iron cores (5) and located on the rear side of the inner static iron core (6).

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

3. A thermal magnetic release circuit breaker with a detachable excitation coil 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. A thermal magnetic release circuit breaker with a detachable excitation coil 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 connecting hole for connecting with a connecting element (8) is provided at the lower end.

5. A thermal magnetic release circuit breaker with a detachable excitation coil 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. A thermal magnetic release circuit breaker with a detachable excitation coil 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 releaser 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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