CN111584316A

CN111584316A - Metal sheet structure of low-current circuit breaker

Info

Publication number: CN111584316A
Application number: CN202010550920.6A
Authority: CN
Inventors: 黄剑锋; 刘文盛
Original assignee: Jiangmen Zhenye Intelligent Control Technology Co ltd
Current assignee: Jiangmen Zhenye Intelligent Control Technology Co ltd
Priority date: 2020-06-16
Filing date: 2020-06-16
Publication date: 2020-08-25

Abstract

The invention relates to a sheet metal structure of a low-current circuit breaker, which is characterized in that: the insulating layer is arranged between the two adjacent conductive blocks; more than two conductive blocks are connected in series or in parallel, and the first conductive block and the last conductive block are respectively connected into a load circuit. The metal sheet structure of the low-current circuit breaker can ensure that enough thermal deformation and enough tripping force are generated under the low-current environment on the basis of not increasing a heating body.

Description

Metal sheet structure of low-current circuit breaker

Technical Field

The invention relates to a thermal trip device, in particular to a metal sheet structure of a low-current circuit breaker.

Background

The thermal tripping device is generally provided with a bimetallic strip structure to realize the thermal tripping effect; the working principle is as follows: when the current on the circuit is increased, the current passing through the bimetallic strip is correspondingly increased, so that the bimetallic strip is thermally deformed to drive the contacts on the tripping mechanism to be separated, the circuit is broken, and the current-limiting protection is realized. The thermal deformation of the bimetallic strip with the same shape and material is determined by the temperature rise, and the temperature rise is determined by the resistance of the bimetallic strip; if the internal resistance of the bimetallic strip is increased, the bimetallic strip needs to be thinned and/or thinned, so that the rigidity of the bimetallic strip is deteriorated, the mechanical force for pushing the tripping mechanism is insufficient, and the inverse relation between the internal resistance and the rigidity is seen; in addition, the current is also one of important factors influencing the thermal deformation of the bimetallic strip, the thermal deformation of the bimetallic strip is larger when the current is larger, and the thermal deformation is smaller when the current is smaller, so that the conventional thermal tripping device is generally only suitable for circuits with large current; in order to solve the problems that the internal resistance and the rigidity of the existing bimetallic strip cannot be balanced and the bimetallic strip is not suitable for a low-current (particularly the current below 1A) circuit, a heating element (such as a heating wire and the like) which assists in heating is generally added to a thermal trip device on the market, so that the bimetallic strip with enough rigidity is additionally heated and deformed to push a trip mechanism to complete the trip action, but the added heating element can cause the problems that the cost of the thermal trip device is increased, the volume is increased and the like; accordingly, further improvements to existing thermal trip units are needed.

Disclosure of Invention

The present invention is directed to overcome the above-mentioned deficiencies in the prior art, and to provide a metal sheet structure for a low current circuit breaker, which can ensure sufficient thermal deformation and sufficient tripping force under a low current environment without increasing a heating element.

The purpose of the invention is realized as follows:

a sheet metal structure of low current circuit breaker, its characterized in that: the insulating layer is arranged between the two adjacent conductive blocks; more than two conductive blocks are connected in series or in parallel, and the first conductive block and the last conductive block are respectively connected into a load circuit.

The input end and the output end of the conductive block are arranged on the conductive block, the input end of the conductive block is electrically connected with the load circuit or the output end of the previous conductive block, and the output end of the conductive block is electrically connected with the load circuit or the input end of the next conductive block.

The conductive block is formed by extending modes such as circuitous extension or spiral extension of a strip-shaped metal piece; the input end is arranged on one extending end of the conductive block, and the output end is arranged on the other extending end of the conductive block.

And the input end and/or the output end are/is provided with conductive pieces used for being connected into a load circuit.

Two adjacent conductive blocks are electrically connected through welding, screw connection, riveting, clamping or conductive adhesive and the like.

The insulating layer is an insulating film or insulating paint and the like.

The conductive block is at least partially attached to the insulating layer.

The invention has the following beneficial effects:

the metal sheet structure ingeniously overlaps and connects more than two conductive blocks, and the adjacent two conductive blocks are separated by the insulating layer, so that the rigidity of the more than two conductive blocks can be overlapped while the integral thermal deformation of the metal sheet structure is ensured to be enough, and the metal sheet structure is ensured to have enough force to push the tripping mechanism; under the structure, the conductive block can be made into a thin and thin shape, and is suitable for a low-current (0.3A) load circuit; because this sheetmetal structure leads to the low current and can produce sufficient heat to satisfy corresponding thermal deformation volume, so this sheetmetal structure can cancel the setting of heat-generating body, and then has saved the space, and the production operation is more convenient, practices thrift manufacturing cost, compares with the mode of plus heat-generating body indirect heating, the performance of generating heat of this sheetmetal structure is more sensitive, is particularly suitable for the miniaturized demand of electrical apparatus switch, is particularly useful for in the relevant electrical product in the aviation field, like control panel on the aircraft.

Drawings

Fig. 1 is a front view of a metal sheet structure in a first embodiment of the present invention.

Fig. 2 and 3 are perspective views of the metal sheet structure in different orientations according to the first embodiment of the present invention.

Fig. 4 and 5 are exploded views of different orientations of the sheet metal structure in the first embodiment of the present invention, respectively.

Fig. 6 is a front view of a metal sheet structure in a second embodiment of the present invention.

Fig. 7 is a perspective view of a metal sheet structure in a second embodiment of the present invention.

Fig. 8 is an exploded view of a metal sheet structure in a second embodiment of the invention.

Fig. 9 is a front view of a metal sheet structure in a third embodiment of the present invention.

Detailed Description

The invention is further described with reference to the following figures and examples.

First embodiment

Referring to fig. 1 to 5, the metal sheet structure of the low current circuit breaker includes more than two conductive blocks deformed by heat and an insulating layer 2 located between two adjacent conductive blocks; more than two conductive blocks are connected in series or in parallel, and the first conductive block and the last conductive block are respectively connected into a load circuit. Specifically, in the metal sheet structure related to this embodiment, the conductive blocks include a first conductive block 1 and a second conductive block 3, the two conductive blocks are arranged in a stacked manner, and are separated from each other by an insulating layer 2, and the overall loop length, resistance, rigidity and other properties of the metal sheet structure are increased under the same projection area; in the stacked metal sheet structure, the influence of heat conduction and heat radiation between the two conductive blocks on temperature rise is higher than that of the traditional structure, and the current required under the same thermal deformation amount is smaller (0.3A), so that the metal sheet structure can generate enough thermal deformation amount and enough force to push the tripping mechanism to act under smaller current, and low-current protection is realized; in addition, because the metal sheet structure can generate enough thermal deformation and enough force to push the tripping mechanism even under a low-current environment, a heating body is omitted, the production operation of the metal sheet structure is more convenient, and the production cost is reduced. In addition, besides the two conductive blocks, three or more than four conductive blocks can be arranged to be overlapped, so that the rigidity is stronger, the temperature rise is larger, and the thermal trip protection with lower current can be realized; the sheet metal structure can be particularly applied to a circuit breaker (thermal tripping micro protection switch) with rated current less than 0.5A.

Furthermore, the conductive block is provided with an input end and an output end, the input end of the conductive block is electrically connected with the load circuit or the output end of the previous conductive block, and the output end of the conductive block is electrically connected with the load circuit or the input end of the next conductive block. Specifically, a first input terminal 101 and a first output terminal 102 are arranged on the first conductive block 1, and a second input terminal 301 and a second output terminal 302 are arranged on the second conductive block 3; the first input terminal 101 is connected to the load circuit, the first output terminal 102 is electrically connected to the second input terminal 301, and the second output terminal 302 is connected to the load circuit.

Furthermore, the two conductive blocks are respectively formed by circuitous extension of a strip-shaped metal piece; the first input end and the second input end are respectively arranged on one extending end of the corresponding conductive block, and the first output end and the second output end are respectively arranged on the other extending end of the corresponding conductive block; the conducting blocks are arranged into a roundabout extending structure, so that the loop length can be effectively increased, and the resistance of the first conducting blocks and the second conducting blocks is increased under the condition of the same cross-sectional area and projection area, so that the heating capacity is enhanced.

Furthermore, the input end and/or the output end are/is provided with a conductive piece for connecting a load circuit. Specifically, the first input terminal 101 is connected to the load circuit through the first conductive member 4, and the second output terminal 302 is connected to the load circuit through the second conductive member 5; the current in the load circuit flows into the first conductive block 1 through the first conductive piece 4, then flows into the second conductive block 3 through the connection point of the first output end 102 and the second input end 301, and finally flows into the load circuit through the second conductive piece 5; in this embodiment, the first conductive member 4, the first conductive block 1, the second conductive block 3, and the second conductive member 5 are made of conductive metal materials, respectively.

Furthermore, two adjacent conductive blocks are electrically connected through welding, screwing, riveting, clamping or conductive adhesive and the like.

Further, the insulating layer is an insulating film, an insulating paint, or the like.

Further, the conductive block is at least partially attached to the insulating layer 2. Specifically, 1 side of first conducting block is laminated with 2 side of insulating layer mutually, and 3 sides of second conducting block are laminated with 2 another side of insulating layer mutually, and two conducting blocks are the insulating laminating mutually, and the heat of production can conduct each other, so under same electric current and environmental condition, the temperature rise effect of the sheetmetal structure of two conducting blocks combination is higher than traditional structure, and under same electric current environment promptly, the whole heat altered shape volume of this sheetmetal structure is bigger than traditional structure, and the driving force that produces is bigger.

Furthermore, the first conductive piece 4 is connected with a switch wiring board on the load circuit, and the second conductive piece 5 is connected with a static contact on the load circuit, so that the metal sheet structure is connected in series in a switch outgoing loop; when the current exceeds a rated value and reaches overload protection current, the metal sheet structure is integrally bent, so that the tripping mechanism is triggered to act to open and break the movable contact, and the load electric appliance is protected.

Second embodiment

Referring to fig. 6 to 8, the low current circuit breaker according to the present embodiment differs from the first embodiment in that: the first and second conductive blocks are formed by spirally extending a strip-shaped metal piece.

Other parts not described above are the same as those of the first embodiment, and are not explained in detail here.

Third embodiment

Referring to fig. 9, the present embodiment relates to a low current circuit breaker having a metal sheet structure different from that of the second embodiment in that: the first and second conductive blocks are respectively formed by extending a strip-shaped metal piece in a further spiral mode.

The foregoing is a preferred embodiment of the present invention, and the basic principles, principal features and advantages of the invention are shown and described. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to illustrate the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and the invention is intended to be protected by the following claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A sheet metal structure of low current circuit breaker, its characterized in that: comprises more than two conductive blocks which are deformed by heating and an insulating layer (2) positioned between two adjacent conductive blocks; more than two conductive blocks are connected in series or in parallel, and the first conductive block and the last conductive block are respectively connected into a load circuit.

2. The sheet metal structure of a low current circuit breaker according to claim 1, wherein: the input end and the output end of the conductive block are arranged on the conductive block, the input end of the conductive block is electrically connected with the load circuit or the output end of the previous conductive block, and the output end of the conductive block is electrically connected with the load circuit or the input end of the next conductive block.

3. The sheet metal structure of a low current circuit breaker according to claim 2, wherein: the conductive block is formed by extending a strip-shaped metal piece in a roundabout way or in a spiral way; the input end is arranged on one extending end of the conductive block, and the output end is arranged on the other extending end of the conductive block.

4. The sheet metal structure of a low current circuit breaker according to claim 2, wherein: and the input end and/or the output end are/is provided with conductive pieces used for being connected into a load circuit.

5. The sheet metal structure of a low current circuit breaker according to claim 1, wherein: two adjacent conductive blocks are electrically connected through welding, screw connection, riveting, clamping or conductive adhesive.

6. The sheet metal structure of a low current circuit breaker according to claim 1, wherein: the insulating layer (2) is an insulating film or insulating paint.

7. The sheet metal structure of a low current circuit breaker according to claim 1, wherein: the conductive block is at least partially attached to the insulating layer (2).