CN203277105U - Plastic casing type circuit breaker - Google Patents
Plastic casing type circuit breaker Download PDFInfo
- Publication number
- CN203277105U CN203277105U CN 201320274242 CN201320274242U CN203277105U CN 203277105 U CN203277105 U CN 203277105U CN 201320274242 CN201320274242 CN 201320274242 CN 201320274242 U CN201320274242 U CN 201320274242U CN 203277105 U CN203277105 U CN 203277105U
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- CN
- China
- Prior art keywords
- contact head
- circuit breaker
- switch mechanism
- described movable
- contact
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model discloses a plastic casing type circuit breaker which comprises a casing, a fixed contact, a movable switch mechanism and a releasing mechanism. The movable switch mechanism comprises a movable contact which is matched with the fixed contact. Silver contact points are arranged on the fixed contact and the movable contact. The silver contact points can prevent the contacts from oxidation due to arc high temperature after repeated contact and disconnection of the fixed contact and the movable contact are carried out. Long-term stable work of the circuit breaker is ensured. During a long-term work process, close contact of the movable contact and the fixed contact is ensured when closing is carried out. The plastic casing type circuit breaker has the advantages of compact structure and reliable work.
Description
Technical field
The utility model relates to a kind of electrical switchgear, relates in particular to a kind of moulded case circuit breaker.
Background technology
Circuit breaker refers to close and closes, carries and cut-off electric current under normal loop condition, and can close close, in the in setting time carrying with cut-off the switching device of the electric current under abnormal loop condition (comprising short circuit condition).Circuit breaker can be used to distribute electric energy; do not start continually asynchronous motor; power circuit and motor etc. are carried out protection, can automatic shutdown circuit when serious overload or short circuit and the fault such as under-voltage occur for their, its function is equivalent to Fuse switch and the combination of crossing underheat relay etc.And generally do not need to change parts after the disjunction fault current.
Existing circuit breaker mainly by shell, be located at contact assembly in shell, drive the transmission component of contact assembly, driven unit and the arc-extinguish chamber of controlling transmission component forms.Its contact is mainly made by copper or copper alloy, can be because the high arc temperature oxidation when break-make repeatedly, and the finally loose contact or cause contact to burn because conducting medium reduces greatly reduces the useful life of circuit breaker.On the other hand, its transmission component can wear and tear in make and break process repeatedly, the thrust minimizing of movable contact and fixed contact, and movable contact and fixed contact can't close contacts, cause its contact-making surface sharply to generate heat, and affect the working stability of circuit breaker.
Summary of the invention
Technical problem to be solved in the utility model is, a kind of moulded case circuit breaker is provided, can prevents contact because high arc temperature and oxidation, and guarantee in the long-term work process movable contact head and fixedly contact head still can close contact when closing a floodgate, compact conformation, reliable operation.
In order to solve the problems of the technologies described above, the utility model provides a kind of moulded case circuit breaker, comprises
Shell;
Fixing contact head, it is fixedly arranged in described shell and part is stretched out described shell;
Movable switch mechanism, it contacts with described fixedly contact head and separates, thus the break-make of control load electric current;
Tripping mechanism, it is located in described shell, when described load current during more than or equal to rated value, discharges the locking to described movable switch mechanism, and described movable switch mechanism is separated with described fixedly contact head;
Described movable switch mechanism comprises the movable contact head that coordinates with described fixedly contact head, described movable contact head can overturn and be switched on or switched off with this and described fixedly contact head around the rotating shaft of described switching mechanism, is equipped with silver contact on described fixedly contact head and described movable contact head.
Improvement as such scheme, described movable contact head is provided with for when described movable switch mechanism and the described fixedly holddown spring that described movable contact head and described fixedly contact head is close to when contact head contacts, and it is located in the rotating shaft of described movable switch mechanism.
As the improvement of such scheme, the thrust of described holddown spring is 7-10N.
As the improvement of such scheme, the specification of described movable contact head is 6.5mm * 4mm * 2mm.
As the improvement of such scheme, described circuit breaker also comprise be located in described shell, the arc-extinguish chamber of described movable switch mechanism top.
As the improvement of such scheme, described tripping mechanism is the Thermomagnetic type tripping mechanism.
As the improvement of such scheme, described Thermomagnetic type tripping mechanism comprises thrermostatic bimetal-plate and is located at the adjusting bolt of described thrermostatic bimetal-plate end.
As the improvement of such scheme, described movable switch mechanism also comprises hand switch, and described hand switch is provided with the handle that part is stretched out described shell; Described handle can be by driving that described hand switch is stirred up and down and the contact of manually controlling described movable switch mechanism and described fixedly contact head with separate.
Implement the utility model, have following beneficial effect:
Movable switch described in the utility model mechanism comprises the movable contact head that coordinates with described fixedly contact head, is equipped with silver contact on described fixedly contact head and described movable contact head.Described silver contact prevents the contact oxidation after and disconnecting at described fixedly contact head and described movable contact head multiple-contact, guarantees the long-term stable operation of circuit breaker.
Described movable contact head is provided with for when described movable switch mechanism and the described fixedly holddown spring that described movable contact head and described fixedly contact head is close to when contact head contacts.Described circuit breaker is in long-term use procedure, described movable contact head can produce diastema with described fixedly contact head because of wearing and tearing, finally cause loose contact, the described movable contact head of described holddown spring assurance is close to described fixedly contact head when "on" position all the time, has improved the reliability of described circuit breaker.
Description of drawings
Fig. 1 is the cutaway view of a kind of moulded case circuit breaker of the utility model;
Fig. 2 is the phantom of a kind of moulded case circuit breaker of the utility model.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in the phantom of the cutaway view of a kind of moulded case circuit breaker of Fig. 1 the utility model and a kind of moulded case circuit breaker of Fig. 2 the utility model, a kind of moulded case circuit breaker comprises
Fixedly contact head 2, and it is fixedly arranged in described shell 1 and part is stretched out described shell 1;
Described movable switch mechanism 3 comprises the movable contact head 31 that coordinates with described fixedly contact head 2, described movable contact head 31 can overturn and be switched on or switched off with this and described fixedly contact head 2 around the rotating shaft of described switching mechanism 3, is equipped with silver contact 32 on described fixedly contact head 2 and described movable contact head 31.
Need to prove, described silver contact 32 prevents contact oxidation because of high arc temperature after and disconnecting at described fixedly contact head 2 and described movable contact head 31 multiple-contacts, guarantees the long-term stable operation of circuit breaker.
Wherein, described movable contact head 31 is provided with the holddown spring 33 that described movable contact head 31 and described fixedly contact head 2 is close to for when described movable switch mechanism 3 contacts with described fixedly contact head 2, and it is located in the rotating shaft of described movable switch mechanism 3.
Need to prove, described circuit breaker is in long-term use procedure, described movable contact head 31 can produce diastema with described fixedly contact head 2 because of wearing and tearing, finally cause loose contact, the described holddown spring 33 described movable contact heads 31 of assurance are close to described fixedly contact head 2 when "on" position all the time, have improved the reliability of described circuit breaker.
Preferably, the thrust of described holddown spring 33 is 7-10N.
Need to prove, the selected pressing force of the spring of the utility model embodiment is for the following current design of specified 200A.Described holddown spring 33 provides thrust with described fixedly contact head 2 for described movable contact head 31, when described thrust is too small, described movable contact head 31 and described fixedly contact head 2 can't be close to fully, cause area of passage not enough, and contact-making surface heating rapidly also may burn; When described thrust is excessive, the circuit breaker disjunction with break-time, the especially short circuit that reduces described circuit breaker causes will cause the circuit or the electrical damage that cause because disjunction is untimely.
Preferably, the specification of described movable contact head 31 is 6.5mm * 4mm * 2mm(length * wide * thickness).
Preferably, described circuit breaker also comprise be located in described shell 1, the arc-extinguish chamber 5 of described movable switch mechanism 3 tops.
Need to prove, described arc-extinguish chamber 5 can be accelerated the arc extinction that contact produces, and ensures that described circuit breaker inner member is not burnt by electric arc.
Preferably, described tripping mechanism 4 is Thermomagnetic type tripping mechanism 41.
Preferably, described Thermomagnetic type tripping mechanism 41 comprises thrermostatic bimetal-plate 42 and the adjusting bolt 43 of being located at described thrermostatic bimetal-plate 42 ends.
Need to prove, described adjusting bolt 43 is used for regulating the drop-away current of described Thermomagnetic type tripping mechanism 41, when described load current during more than or equal to rated value, described Thermomagnetic type tripping mechanism 41 will discharge it to the locking of described movable switch mechanism 3, and described movable switch mechanism 3 is separated with described fixedly contact head 2.
Preferably, described movable switch mechanism 3 also comprises hand switch 6, and described hand switch 6 is provided with the handle 7 that part is stretched out described shell 1; Described handle 7 can be by driving that described hand switch 6 is stirred up and down and the contact of manually controlling described movable switch mechanism 3 and described fixedly contact head 2 with separate.
Need to prove, described hand switch 6 make the operator can be by stirring described hand switch 6 disjunction or the load of connecting described circuit breaker, when needs close described circuit breaker, can manually will be allocated to closing position on described handle 7; When needs cut off described circuit breaker, can be manually that the hand switch 6 that is in closing position is drop-down, it is in opens a sluice gate the position.
Above disclosed is only a kind of preferred embodiment of the utility model, certainly can not limit with this interest field of the utility model, and the equivalent variations of therefore doing according to the utility model claim still belongs to the scope that the utility model is contained.
Claims (8)
1. a moulded case circuit breaker, is characterized in that, comprises
Shell;
Fixing contact head, it is fixedly arranged in described shell and part is stretched out described shell;
Movable switch mechanism, it contacts with described fixedly contact head and separates, thus the break-make of control load electric current;
Tripping mechanism, it is located in described shell, when described load current during more than or equal to rated value, discharges the locking to described movable switch mechanism, and described movable switch mechanism is separated with described fixedly contact head;
Described movable switch mechanism comprises the movable contact head that coordinates with described fixedly contact head, described movable contact head can overturn and be switched on or switched off with this and described fixedly contact head around the rotating shaft of described switching mechanism, is equipped with silver contact on described fixedly contact head and described movable contact head.
2. circuit breaker as claimed in claim 1, it is characterized in that, described movable contact head is provided with for when described movable switch mechanism and the described fixedly holddown spring that described movable contact head and described fixedly contact head is close to when contact head contacts, and it is located in the rotating shaft of described movable switch mechanism.
3. circuit breaker as claimed in claim 2, is characterized in that, the thrust of described holddown spring is 7-10N.
4. circuit breaker as claimed in claim 2, is characterized in that, the specification of described movable contact head is 6.5mm * 4mm * 2mm.
5. circuit breaker as claimed in claim 1, is characterized in that, described circuit breaker also comprise be located in described shell, the arc-extinguish chamber of described movable switch mechanism top.
6. circuit breaker as claimed in claim 1, is characterized in that, described tripping mechanism is the Thermomagnetic type tripping mechanism.
7. circuit breaker as claimed in claim 6, is characterized in that, described Thermomagnetic type tripping mechanism comprises thrermostatic bimetal-plate and is located at the adjusting bolt of described thrermostatic bimetal-plate end.
8. circuit breaker as claimed in claim 1, is characterized in that, described movable switch mechanism also comprises hand switch, and described hand switch is provided with the handle that part is stretched out described shell; Described handle can be by driving that described hand switch is stirred up and down and the contact of manually controlling described movable switch mechanism and described fixedly contact head with separate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320274242 CN203277105U (en) | 2013-05-20 | 2013-05-20 | Plastic casing type circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320274242 CN203277105U (en) | 2013-05-20 | 2013-05-20 | Plastic casing type circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203277105U true CN203277105U (en) | 2013-11-06 |
Family
ID=49507462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320274242 Expired - Fee Related CN203277105U (en) | 2013-05-20 | 2013-05-20 | Plastic casing type circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203277105U (en) |
-
2013
- 2013-05-20 CN CN 201320274242 patent/CN203277105U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131106 Termination date: 20170520 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |