CN215771041U - Overload protection mechanism of circuit breaker - Google Patents
Overload protection mechanism of circuit breaker Download PDFInfo
- Publication number
- CN215771041U CN215771041U CN202122316459.0U CN202122316459U CN215771041U CN 215771041 U CN215771041 U CN 215771041U CN 202122316459 U CN202122316459 U CN 202122316459U CN 215771041 U CN215771041 U CN 215771041U
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- circuit breaker
- bimetallic strip
- magnet
- electromagnet
- overload protection
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Abstract
The utility model discloses an overload protection mechanism of a circuit breaker, which comprises a bimetallic strip, wherein the front end of the bimetallic strip is integrally connected with a lapping plate, the rear end of the bimetallic strip is integrally provided with a connecting fixing plate, the bimetallic strip is provided with an on-off auxiliary mechanism, the on-off auxiliary mechanism comprises a lower magnet and an upper magnet, the upper magnet is arranged in the circuit breaker and corresponds to the lower magnet, the upper magnet is a permanent magnet, and a first electromagnet is fixed in a shell. The utility model provides an overload protection mechanism of a circuit breaker, which is ingenious in structural arrangement and reasonable in arrangement, when instantaneous overload occurs after a bimetallic strip is used as a moving contact to be in contact with a fixed contact of the circuit breaker to conduct a circuit, a first electromagnet is electrified to generate magnetism, an upper magnet is a permanent magnet, and the first electromagnet is instantly pushed to be away from the upper magnet by utilizing the principle that like poles repel each other, so that the bimetallic strip is rapidly disconnected from the fixed contact, the gradual conduction limitation of heat is avoided, the disconnection operation can be rapidly carried out, and the protection effect is obvious.
Description
Technical Field
The utility model relates to the technical field of circuit breaker equipment, in particular to an overload protection mechanism of a circuit breaker.
Background
The circuit breaker is a switching device capable of closing, carrying, and opening/closing a current under a normal circuit condition and a current under an abnormal circuit condition within a prescribed time.
Breaker overload protection device among low-voltage circuit breaker generally includes heating element and bimetallic strip, leads to heating element's heat conduction to the bimetallic strip when overcurrent, leads to different expansion coefficient's bimetallic strip crooked, realizes jumping of circuit breaker disconnected, and this kind of structure can't provide effectual protection to transshipping in the twinkling of an eye, because instantaneous overload heat needs time to the conduction of bimetallic strip, leads to the bimetallic strip to jump disconnected in time, and the protection is timely inadequately. Therefore, the inventor provides the overload protection mechanism of the circuit breaker by combining various factors.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to an overload protection mechanism for a circuit breaker, which solves the above problems.
In order to achieve the purpose, the utility model provides the following technical scheme:
the utility model provides a circuit breaker overload protection mechanism, including the bimetallic strip, bimetallic strip front end integrated into one piece is connected with the overlap strap, bimetallic strip rear end integrated into one piece installs the connection stationary blade, install break-make complementary unit on the bimetallic strip, break-make complementary unit includes magnet and last magnet down, lower magnet is installed and is leaned on the front position in the bimetallic strip top, it just is corresponding with lower magnet to go up magnet installation in the circuit breaker, it is the permanent magnet to go up magnet, lower magnet includes the shell, the shell internal fixation has the first electro-magnet that the shell was spilt at the top, be equipped with insulating cushion block between bottom and the first electro-magnet in the shell, both ends are fixed with the resistance post respectively about the first electro-magnet, the resistance post passes the shell simultaneously and hugs closely with the bimetallic strip mutually.
After the bimetallic strip is used as a moving contact to be in contact with a fixed contact of a circuit breaker to conduct a circuit, when instantaneous overload occurs, the circuit is greatly increased by current, the current passes through the resistance column to be communicated with the first electromagnet, so that the first electromagnet is electrified to generate magnetism, the upper magnet is a permanent magnet, and the first electromagnet is instantly pushed to be away from the upper magnet by utilizing the principle that like poles repel each other, so that the bimetallic strip is rapidly disconnected from the fixed contact, the gradual conduction limitation of heat is avoided, the disconnection operation can be rapidly performed, and the protection effect is obvious.
As a further scheme of the utility model: the shell is made of insulating plastics, and the shell is glued and is fixed in on the bimetallic strip, and the shell is used for semi-enclosed fixed.
As a further scheme of the utility model: the circuit breaker is internally provided with arc extinguishing mechanisms corresponding to the side edge positions of the lap joint pieces, and each arc extinguishing mechanism comprises an arc extinguishing grating plate and is used for extinguishing electric arcs generated in the moment when the movable contact and the fixed contact are switched on and off, so that the harm of the electric arcs is reduced.
As a further scheme of the utility model: arc extinguishing mechanism still includes the fixed plate, integrated into one piece is connected with the dead lever on the fixed plate, arc extinguishing grating board side trompil cover forms the support on the dead lever, the fixed rod tip is fixed with the permanent magnet through gluing, arc extinguishing grating board tip is fixed with the second electro-magnet through the fixed block, the second electro-magnet is corresponding with the permanent magnet, after electric arc was introduced on the arc extinguishing grating board, the electric current of electric arc is big more, the circular telegram electric current of second electro-magnet is just big more, thereby its magnetism is just stronger, the second electro-magnet repels mutually with permanent magnet like nature and is pulled open, thereby impel the arc extinguishing grating board more to bimetallic strip is close to, thereby be more convenient for pull in the arc extinguishing grating board with electric arc and carry out the arc extinction operation, the arc extinguishing effect is better.
As a further scheme of the utility model: the fixed plate is an insulating plate and is fixed in the circuit breaker through screws.
Compared with the prior art, the utility model has the following beneficial effects:
1. the utility model provides an overload protection mechanism of a circuit breaker, which is ingenious in structural arrangement and reasonable in arrangement, wherein a first electromagnet is electrified to generate magnetism, an upper magnet is a permanent magnet, and the first electromagnet is instantly pushed to be away from the upper magnet by utilizing the principle that like poles repel each other, so that a bimetallic strip is rapidly disconnected from a stationary contact, the gradual conduction limitation of heat is avoided, the disconnection operation can be rapidly carried out, and the protection effect is obvious;
2. after the electric arc is introduced into the arc extinguishing grating plate, the larger the current of the electric arc is, the larger the electrified current of the second electromagnet is, so that the magnetism of the second electromagnet is stronger, the like poles of the second electromagnet and the permanent magnet repel each other and are pulled away, so that the arc extinguishing grating plate is more close to the bimetallic strip, the electric arc is more conveniently pulled into the arc extinguishing grating plate to perform arc extinguishing operation, and the arc extinguishing effect is better;
3. the overload protection mechanism of the circuit breaker has the advantages of simple structure, instant response speed of overload protection and obvious protection effect.
Drawings
Fig. 1 is a schematic structural diagram of an overload protection mechanism of a circuit breaker.
Fig. 2 is a schematic structural diagram of an overload protection mechanism of the circuit breaker.
Fig. 3 is a schematic structural diagram of an overload protection mechanism of the circuit breaker.
In the figure: 1. a bimetal; 11. connecting a fixing sheet; 12. a lap joint sheet; 2. an on-off assist mechanism; 21. a lower magnet; 211. a housing; 212. a first electromagnet; 213. insulating cushion blocks; 214. a resistance post; 22. an upper magnet; 3. an arc extinction mechanism; 31. a fixing plate; 32. an arc extinguishing grid plate; 33. a permanent magnet; 34. a second electromagnet; 35. a fixed block; 36. and (5) fixing the rod.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Referring to fig. 1 to 3, an overload protection mechanism for a circuit breaker includes a bimetal 1, an on-off auxiliary mechanism 2 and an arc extinguishing mechanism 3;
the front end of the bimetallic strip 1 is integrally connected with a lapping plate 12 for contacting with a static contact so as to conduct a circuit, and the rear end of the bimetallic strip 1 is integrally provided with a connecting fixing plate 11 for fixing the bimetallic strip 1;
the on-off auxiliary mechanism 2 comprises a lower magnet 21 and an upper magnet 22, the lower magnet 21 is arranged at the position, close to the front, of the top of the bimetallic strip 1, the upper magnet 22 is arranged in the circuit breaker and corresponds to the lower magnet 21, the upper magnet 22 is a permanent magnet, the lower magnet 21 comprises a shell 211, a first electromagnet 212, an insulating cushion block 213 and two resistance columns 214, the shell 211 is made of insulating plastics, the shell 211 is fixed on the bimetallic strip 1 in an adhesive mode, the first electromagnet 212 is arranged in the shell 211 while the top of the first electromagnet leaks out of the shell 211, the insulating cushion block 213 is supported between the shell 211 and the first electromagnet 212, the two resistance columns 214 are respectively fixed with the left end and the right end of the first electromagnet 212, and the two resistance columns 214 simultaneously penetrate through the shell 211 and are attached to the bimetallic strip 1;
The working principle of the utility model is as follows: after the bimetallic strip 1 is used as a moving contact to be in contact with a fixed contact of a circuit breaker to conduct a circuit, when instantaneous overload occurs, the circuit greatly increases through current, the current passes through the resistance column 214 to be communicated with the first electromagnet 212, so that the first electromagnet 212 is electrified to generate magnetism, the upper magnet 22 is a permanent magnet, and by utilizing the principle that like poles repel each other, the first electromagnet 212 is instantly pushed to be away from the upper magnet 22, so that the bimetallic strip 1 is quickly disconnected from the fixed contact, the gradual conduction limitation of heat is avoided, the disconnection operation can be quickly carried out, and the protection effect is obvious;
meanwhile, after the arc is introduced into the arc extinguishing grid plate 32, the larger the current of the arc is, the larger the electrifying current of the second electromagnet 34 is, so that the magnetism of the second electromagnet is stronger, the like poles of the second electromagnet 34 and the permanent magnet 33 repel each other and are pulled away, so that the arc extinguishing grid plate 32 is close to the bimetallic strip 1, the arc extinguishing operation is performed by pulling the arc into the arc extinguishing grid plate 32 more conveniently, and the arc extinguishing effect is better.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.
Claims (5)
1. The overload protection mechanism of the circuit breaker comprises a bimetallic strip (1) and is characterized in that the front end of the bimetallic strip (1) is integrally connected with a connecting plate (12), the rear end of the bimetallic strip (1) is integrally provided with a connecting fixing plate (11), the bimetallic strip (1) is provided with an on-off auxiliary mechanism (2), the on-off auxiliary mechanism (2) comprises a lower magnet (21) and an upper magnet (22), the lower magnet (21) is arranged at the position, close to the front end, of the top of the bimetallic strip (1), the upper magnet (22) is arranged in the circuit breaker and corresponds to the lower magnet (21), and the upper magnet (22) is a permanent magnet;
the lower magnet (21) comprises a shell (211), a first electromagnet (212) with the top leaking out of the shell (211) is fixed in the shell (211), an insulating cushion block (213) is arranged between the bottom in the shell (211) and the first electromagnet (212), the left end and the right end of the first electromagnet (212) are respectively fixed with a resistance column (214), and the resistance columns (214) simultaneously penetrate through the shell (211) and are tightly attached to the bimetallic strip (1).
2. The overload protection mechanism for a circuit breaker according to claim 1, wherein the housing (211) is made of insulating plastic, and the housing (211) is adhesively fixed to the bimetal (1).
3. A circuit breaker overload protection mechanism according to claim 1 or 2, characterized in that an arc extinction mechanism (3) is installed at the same time in the circuit breaker corresponding to the side position of the bridging plate (12), and the arc extinction mechanism (3) comprises an arc extinction grating plate (32).
4. The overload protection mechanism for the circuit breaker according to claim 3, wherein the arc extinguishing mechanism (3) further comprises a fixing plate (31), a fixing rod (36) is integrally connected to the fixing plate (31), openings are formed in the side edges of the arc extinguishing grid plate (32) and sleeved on the fixing rod (36) to form a support, a permanent magnet (33) is fixed to the end portion of the fixing rod (36) through glue, a second electromagnet (34) is fixed to the end portion of the arc extinguishing grid plate (32) through a fixing block (35), and the second electromagnet (34) corresponds to the permanent magnet (33).
5. The overload protection mechanism for a circuit breaker according to claim 4, wherein the fixing plate (31) is an insulating plate fixed in the circuit breaker by screws.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122316459.0U CN215771041U (en) | 2021-09-24 | 2021-09-24 | Overload protection mechanism of circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122316459.0U CN215771041U (en) | 2021-09-24 | 2021-09-24 | Overload protection mechanism of circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215771041U true CN215771041U (en) | 2022-02-08 |
Family
ID=80090561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122316459.0U Active CN215771041U (en) | 2021-09-24 | 2021-09-24 | Overload protection mechanism of circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215771041U (en) |
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2021
- 2021-09-24 CN CN202122316459.0U patent/CN215771041U/en active Active
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