CN102214537A - Circuit breaker - Google Patents
Circuit breaker Download PDFInfo
- Publication number
- CN102214537A CN102214537A CN2011100901983A CN201110090198A CN102214537A CN 102214537 A CN102214537 A CN 102214537A CN 2011100901983 A CN2011100901983 A CN 2011100901983A CN 201110090198 A CN201110090198 A CN 201110090198A CN 102214537 A CN102214537 A CN 102214537A
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- CN
- China
- Prior art keywords
- connecting plate
- movable contactor
- circuit breaker
- main element
- plate assembly
- 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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- Thermally Actuated Switches (AREA)
- Breakers (AREA)
Abstract
The invention discloses a circuit breaker, especially a molded case circuit breaker, which comprises a fixed contactor connected with a power supply side terminal, a movable contactor configured to be capable of being connected or not connected with the fixed contactor, a connecting plate assembly configured to rotatably support the movable contactor, a heater coupled to the connecting plate assembly and a shaft configured to be fixedly connected with the connecting plate assembly and limit the rotation range of the movable contactor. The connecting plate assembly comprises a main body connected with the heater and a pair of connection plates extending to the shaft from the rear surface of the main body. The movable contactor is rotatably coupled to one end of the pair of connection plates.
Description
Technical field
The present invention relates to a kind of breaker of plastic casing (molded case circuit breaker), relate in particular to a kind of structure that is used for the switching mechanism of breaker of plastic casing.
Background technology
Usually, circuit breaker is a kind of electric device that uses in various wiring units, and it is used under the normal load state opening and closing circuit and with circuit ground and in case protect various circuit and equipment by the blocking-up electric current when accident such as short circuit etc. takes place.As depicted in figs. 1 and 2, the circuit breaker of correlation technique comprises: housing 1, and it defines outward appearance and is made by insulating material; The two ends that are present in housing 1 are used for power supply side terminal 2 and the load side terminal 3 that circuit connects; With fixed contact 4, fixed contact 4 with housing 1 in 2 one-tenth contact conditions of power supply side terminal under make circuit be connected to circuit breaker.
And the housing 1 of circuit breaker comprises therein: tripping mechanism, and it is used for detection of excessive current or short circuit current so that circuit breaker trip (trip); Switching mechanism, it is used for driving movable contactor 5 and carrying out blocking-up and opening and closing operations automatically by the tripping operation action of tripping operation structure and manual operation.Handle 6 is cooperated mutually with switching mechanism and is allowed hand off or closed circuit, and handle 6 is outwards outstanding from the upper surface of housing 1.
Here, the tripping operation structure comprises: heating element 7, and it is used for distribute heat when the overcurrent that surpasses rated current is flowed through circuit breaker; Bimetallic devices 8, its heat in response to heating element 7 are distributed to a lateral bending song; With control screw rod 10, it can be connected to the part in length and breadth (crossbar) 9 of switching mechanism along a direction rotation with driving in response to the bending of bimetallic devices 8.Arc extinguishing unit 11 further is installed in a side at the electric arc that produces between movable contactor 5 and fixed contact 4 with elimination above the fixed contact 4.
Switching mechanism comprises connector unit (link unit) 14, and reverse when mobile in response to the main spring 13 that is driven by the operation of handle 6 when each interconnect (not shown), connector unit 14 makes movable contactor 5 rotate along a direction.
Hereinafter, the process of blocking this overcurrent when overcurrent is flowed through the circuit breaker with these parts will be described in detail.
At first, when the overcurrent that surpasses rated current was flowed through circuit, movable contactor 5 and fixed contact 4 were in contact condition each other, i.e. the electric current circuit breaker of flowing through.Here, when the overcurrent Continuous Flow when the power supply side terminal 2 of circuit breaker surpasses preset time, the heating element 7 beginning distribute heats of tripping mechanism.
Correspondingly, the heat that distributes from heating element 7 is bimetallic devices 8 heating, thereby bimetallic devices 8 is crooked and make 10 rotations of control screw rod towards a direction.Revolving force by control screw rod 10 makes the part in length and breadth 9 that is connected to connector unit 14 rotate to drive connector unit 14 towards a direction then.Therefore, the movable contactor 4 that is used for the circuit connection separates with fixed contact, thus the blocking-up electric current.Here, in the moment in that movable contactor 5 and fixed contact 4 separate, typically can produce hard arc.The electric arc that produces is induced to the grid sheet 12 of arc extinguishing unit 14 and is disappeared therein.
Hereinafter, the tripping operation structure of circuit breaker will be described in more detail with reference to figure 3 and Fig. 4.
The tripping operation structure comprises: movable contactor 5, and it rotatably is inserted into by a plurality of connectors (link) and connects in the axle 15 that is constituted; Restriction (the limit latch) 17 that pull, the end place that it is integrally formed in the insertion axle 15 of movable contactor 5 is used for limiting the rotating range of the movable contactor 5 that moves up and down; Compression spring 18, it is inserted horizontally into axle 15 and restriction is pulled between 17, is used for applying and compresses relevant elastic force; Heating element 7, it is installed in axle 15 opposite opposite side, is used for distribute heat when overcurrent is flowed through; With connecting plate 19, it is fixed to the inner surface of housing 1 by hinge-coupled to the other end of movable contactor 5 and with an end of heating element 7.
Pin with predetermined length is inserted into hinge-coupled portion between movable contactor 5 and the connecting plate 19 playing its effect, and contact spring 21 is inserted in the two ends of pin 20, and two side direction movable contactors 5 at movable contactor 5 apply contact pressure under the state in the connecting plate 19 to be inserted at movable contactor 5.Packing ring 22 is inserted into the both sides of pin 20 to finish hinge-coupled then.
Here, explain the operation of these parts, as indicated above, when overcurrent was flowed through circuit, movable contactor 5 rotated up to cut off circuit.When heating element 7 be driven in response to the connector unit 14 that flows through distribute heat and cooperate with heating element 7 thus of overcurrent so that the axle 15 that constitutes by a plurality of connectors when a direction is reversed, this process can be activated.
That is to say that when axle 15 was rotated in a counter-clockwise direction in the drawings, the axle 15 that touches the lower surface of movable contactor 5 upwards promoted movable contactor 5.Correspondingly, movable contactor 5 separates with fixed contact 4, thereby cuts off circuit.
On the contrary, when closed circuit, by with above opposite order, axle 15 is rotated in the drawings in a clockwise direction, promotes restriction and pulls 17 so be installed in compression spring 18 in the axle 15.The restriction that is promoted by the pressure of spring 18 17 rear sides that upwards promote movable contactor 5 then of pulling.Correspondingly, the front side that makes movable contactor 5 is rotated in a clockwise direction so that the contact point of movable contactor 5 contacts with the contact point of fixed contact 4 under being installed in it, thereby allows electric current to pass through.
Simultaneously, when big fault current produces (for example, because the short circuit generation), fault current flows into circuit breaker and produces extremely strong electromagnetic repulsion force with the contact site place between fixed contact 4 and movable contactor 5.Here, the electromagnetic repulsion force of generation correspondingly, makes movable contactor 5 rotate up based on axle 15 greater than the elastic force that 17 the compression spring 18 of being pulled by restriction applies, thereby cuts off circuit.Therefore, can prevent contingent accident such as fire etc.
Therefore, can stable operation in order to make switching mechanism with this structure, movable contactor 5 should be connected with the frictional force of suitable degree with connecting plate 19.That is, if having big gap between movable contactor 5 and connecting plate 19, contact impedance can increase, correspondingly temperature can increase be higher than temperature required, thereby the tripping operation that can make circuit early takes place.On the other hand, if there is minimum gap between them, the rotation of movable contactor 5 will be interrupted.
In the prior art, as mentioned above, at first make connecting plate 19, it has slightly the gap greater than the required gap of reality, and is crooked by the elastic force institute of contact spring 21 afterwards, thereby keeps the appropriate gap with movable contactor 5.Yet connecting plate 19 also is used for supporting movable contactor 5, so it need have the rigidity that is higher than certain level.Thereby connecting plate 19 is thicker than predetermined thickness, and this makes connecting plate 19 be difficult to bending.Therefore, contact spring 21 should have sizable elastic force.
Therefore, it is difficult that the manufacturing of connecting plate 19 becomes, and cause having reduced its basic reliability owing to connecting plate 19 is not easy bending.
Summary of the invention
In order to overcome the shortcoming of prior art, the scheme of detailed description provides a kind of breaker of plastic casing, and it has, and can be touched spring crooked smoothly and the connecting plate of the rigidity of suitable size arranged.
In order to realize the advantage of these and other, according to this illustrative purposes, as specializing with broadly described here, breaker of plastic casing comprises: fixed contact, and it is connected to power supply side terminal; Movable contactor, it is arranged as and can contacts with movable contactor and not contact; The connecting plate assembly, it is configured to rotatably support movable contactor; Heating element, it is attached to the connecting plate assembly; And axle, it is configured to the rotating range of fixedly connected board component and restraint contactor, and wherein the connecting plate assembly comprises: the main element that is attached to heating element; Extend to a pair of connecting plate of axle with rear surface from main element, movable contactor rotatably is attached to an end of a pair of connecting plate.
In this scheme, the connecting plate assembly can be made of main element independent of each other and connecting plate, thereby is beneficial to assembling movable contactor and connecting plate assembly.That is, connecting plate can at first be attached to movable contactor, and main element could be attached to connecting plate, and this is beneficial to assembling, even also be like this when using the contact spring with big spring coefficient.
Here, a pair of connecting plate all can comprise the main element side connection part that is attached to main element and be attached to the hinge-coupled portion (hinge coupling portion) of movable contactor by hinge (hinge) that wherein main element side connection part and hinge-coupled portion can have the width that differs from one another separately.Correspondingly, the connecting plate with big width can help to improve and connects rigidity, and another connecting plate with narrower width can easily be out of shape.This structure can allow connecting plate by crooked and have enough rigidity smoothly.Here, the width of main element side connection part can be narrower than the width of hinge-coupled portion, and is perhaps opposite.
And a pair of connecting plate is pressed by a plurality of flaggies separately and is constituted.Therefore, when connecting plate was bent, each plate all can be allowed to independent bending and be beneficial to its distortion, and had obtained enough connection rigidity owing to movable contactor is supported by a plurality of plates.
Here, the plate of formation connecting plate can be of similar shape or different shapes.
When each plate had different shapes, in a plurality of plates, the plate that is arranged in the outside can form longlyer, thereby allows stable support and easier bending.
According to the scheme of the detailed description with above-mentioned configuration, connecting plate can smoothed bending and is had sufficient rigidity, and correspondingly, connecting plate and movable contactor can stably be coupled to each other, and the reliability that causes device improves and minimizes misoperation.
And by detailed description hereinafter, it is clearer and more definite that the application's the scope of application will become.Yet, should be understood that, these that are used for representing the preferred embodiments of the present invention describe in detail and specific examples only is to be used for explaining, because all be conspicuous to those skilled in the art according to the variations and modifications that are described in detail in the spirit and scope of the invention.
Description of drawings
The accompanying drawing that comprises provides further understanding of the present invention, incorporates the specification and the part of book as an illustration into, and it illustrates one exemplary embodiment, and is used for explaining principle of the present invention with specification.
In the drawings:
Fig. 1 shows the stereogram according to the typical breaker of plastic casing of prior art;
Fig. 2 shows the cutaway view of internal structure of the breaker of plastic casing of Fig. 1;
Fig. 3 shows the exploded perspective view of a part of switching mechanism of the breaker of plastic casing of Fig. 1;
Fig. 4 shows the stereogram according to the switching mechanism of the breaker of plastic casing of an one exemplary embodiment;
Fig. 5 is the exploded perspective view of the switching mechanism among Fig. 4; With
Fig. 6 shows the plane graph of another one exemplary embodiment of breaker of plastic casing.
Embodiment
Hereinafter, will be described in detail breaker of plastic casing in conjunction with the accompanying drawings.In the following description, those parts of the breaker of plastic casing of describing in Fig. 3 with Fig. 1 identical/similarly parts will use identical reference number, therefore will omit the description of repetition.
Fig. 4 shows the stereogram according to the movable contactor of the breaker of plastic casing of an one exemplary embodiment and connecting plate assembly, and Fig. 5 is its exploded perspective view.
As shown in Figure 4 and Figure 5, being used for rotatably fixedly, the connecting plate assembly of movable contactor 17 can comprise connecting plate 100 and main element 110.The connecting plate assembly can closely be attached on the both side surface of movable contactor 17, to carry out fully with movable contactor 17 that the surface contacts and firmly to support movable contactor 17 simultaneously and rock to stop it.
Connecting plate 100 can have following structure, and promptly two in them are laminated on each side surface place of movable contactor 17, and does not need to use adhesive or analog and only by set bolt 120 connecting plate is attached to main element 110.Therefore, when applying external force, each connecting plate 100 is out of shape to a certain degree independently, thereby applies identical power and also can increase deflection even compare with monolithic molding to the side surface of the connecting plate 100 of lamination.
Here, the thickness with being set at the connecting plate of prior art of the thickness of two connecting plates 100 is identical.
Each connecting plate 100 can comprise: the main element side connection part 102 that is attached to main element 110; With the pin side connection part 104 that is attached to pin 20.The width of pin side connection part 104 can be set at wideer than the width of main element side connection part 102.Therefore, main element side connection part 102 can have than the rigidity a little less than the pin side connection part 104 of broad.This structure can allow main element side connection part 102 distortion when applying external force.Therefore, the rigidity that this structure can increase the hinge-coupled portion that connects with pin 20 to be allowing firm connection, and the rigidity that reduces main element side connection part relatively is to allow more level and smooth distortion.
Simultaneously, main element 110 can comprise: the heating element connection part 112 that is attached to heating element 7; Head 114 with the upside that is present in heating element connection part 112.Connecting plate 100 can be fixed to the both side surface of head 114 by set bolt 120.Use two set bolts 120 to be fixed to each side of connecting plate 100.
At last, the pin-and-hole 104a and the bolt hole 102a that is used for by its insertion set bolt 120 that is used for by its insertion pin 20 can be set at the both ends of each connecting plate 100.
Therefore, because connecting plate 100 has the form that extends to pin 20 from the upside of heating element connection part 112, so compare it and have longer development length with of the prior art, this helps distortion more.Correspondingly, connecting plate 100 can be attached to movable contactor 17 with suitable gap.
In fact, carry out testing current to the connecting plate of prior art with according to the connecting plate of an one exemplary embodiment, and carry out temperature survey at power supply side terminal 2, load side terminal 3 and heating element connection part 112 places.Measurement result is presented in the following table.
Table 1
As shown in table 1, prior art and one exemplary embodiment show to have the difference of about 0.5K at the mean value of power supply side terminal and load side terminal place temperature, and it is considered to basic identical.Yet the temperature maximum that the temperature that should be noted that the heating element connection part of one exemplary embodiment is lower than the heating element connection part of prior art is approximately 16.7k.This is to come from following structure: the connecting plate of one exemplary embodiment is contacted thereby increased with the surface of movable contactor 17 compared with prior art biglyyer by crooked smoothly, has correspondingly reduced contact impedance.
One exemplary embodiment can be varied to various forms.That is, can consider the modified example of the difform connecting plate of lamination.Fig. 6 shows the plane graph of this modified example.As shown in Figure 6, connecting plate 100 and than the short connecting plate 100a of connecting plate 100 lamination each other.Here, connecting plate of only outwards arranging rather than the inside connecting plate 100a that arranges can be attached to movable contactor 17.
By this structure, inwardly the connecting plate 100a that arranges can have the rigidity of increase, and the connecting plate of outwards arranging 100 can allow more level and smooth distortion.
In some cases, can consider such example: only the connecting plate of inwardly arranging is attached to pin, also can consider so other example: three connecting plates are by lamination, and the connecting plate in the middle of only being positioned at is attached to pin.
Aforesaid embodiment and example only are exemplary, can not be used for being interpreted as limitation of the present invention.Instruction of the present invention can be easy to be applied to the device of other type.Such description is illustrative, can not be used for limiting the scope of claim.Many replacements, modification and change it will be apparent to those skilled in the art that.The feature of one exemplary embodiment described herein, structure, method and other characteristic will be combined in every way to obtain one exemplary embodiment other and/or that substitute.
Because the feature that exists can be embodied as the various ways that does not break away from its characteristic, should be understood that, embodiment described above can not imposed any restrictions above retouching in detail by aforesaid, unless extra statement should broadly be explained with accessory claim institute restricted portion.Therefore fall into all changes and the change of the boundary and the scope of claim, perhaps these boundaries or scope is equal to substitute and will be comprised in the claim of submission.
Claims (5)
1. breaker of plastic casing comprises:
Fixed contact, it is connected to power supply side terminal;
Movable contactor, it is arranged as and can contacts and not contact with described fixed contact;
The connecting plate assembly, it is configured to rotatably support described movable contactor;
Heating element, it is attached to described connecting plate assembly; With
Axle, the rotating range that it is configured to fixing described connecting plate assembly and limits described movable contactor,
It is characterized in that described connecting plate assembly comprises:
Main element, it is attached to described heating element; With
A pair of connecting plate, its rear surface from described main element extend to described axle, and described movable contactor rotatably is attached to an end of a pair of connecting plate.
2. circuit breaker as claimed in claim 1, wherein said a pair of connecting plate includes separately:
Main element side connection part, it is attached to described main element; With
Hinge-coupled portion, its by hinge-coupled to described movable contactor,
Wherein said main element side connection part has different width each other with described hinge-coupled portion.
3. circuit breaker as claimed in claim 2, the width of wherein said main element side connection part is narrower than the width of described hinge-coupled portion.
4. circuit breaker as claimed in claim 1, wherein said a pair of connecting plate are pressed by a plurality of flaggies separately and are formed.
5. circuit breaker as claimed in claim 4, wherein in the plate that constitutes described connecting plate, the plate that is arranged in the outside is longer than other plate.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020100032449A KR101344260B1 (en) | 2010-04-08 | 2010-04-08 | Molded circuit breaker |
| KR10-2010-0032449 | 2010-04-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102214537A true CN102214537A (en) | 2011-10-12 |
| CN102214537B CN102214537B (en) | 2014-05-14 |
Family
ID=44745805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110090198.3A Expired - Fee Related CN102214537B (en) | 2010-04-08 | 2011-04-08 | Circuit breaker |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR101344260B1 (en) |
| CN (1) | CN102214537B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102043292B1 (en) | 2019-02-07 | 2019-12-02 | (주)에너담 | Universal Battery Remote Shut-off Device |
| KR102311037B1 (en) | 2021-02-19 | 2021-10-12 | (주)에너담 | Intergrated control device for switch module |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1118928A (en) * | 1994-02-08 | 1996-03-20 | 富士电机株式会社 | Movable contactor device in circuit breaker |
| US5634554A (en) * | 1994-12-15 | 1997-06-03 | Siemens Energy & Automation, Inc. | Interface connection for a circuit breaker plug-in trip unit |
| US20030038695A1 (en) * | 2001-08-21 | 2003-02-27 | Siemens Energy And Automation, Inc | Pivot joint for a movable contact arm in a molded case circuit breaker |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100798340B1 (en) | 2006-12-29 | 2008-01-28 | 엘에스산전 주식회사 | Molded case circuit breaker with limit current function |
-
2010
- 2010-04-08 KR KR1020100032449A patent/KR101344260B1/en active IP Right Grant
-
2011
- 2011-04-08 CN CN201110090198.3A patent/CN102214537B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1118928A (en) * | 1994-02-08 | 1996-03-20 | 富士电机株式会社 | Movable contactor device in circuit breaker |
| US5634554A (en) * | 1994-12-15 | 1997-06-03 | Siemens Energy & Automation, Inc. | Interface connection for a circuit breaker plug-in trip unit |
| US20030038695A1 (en) * | 2001-08-21 | 2003-02-27 | Siemens Energy And Automation, Inc | Pivot joint for a movable contact arm in a molded case circuit breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102214537B (en) | 2014-05-14 |
| KR20110113099A (en) | 2011-10-14 |
| KR101344260B1 (en) | 2013-12-24 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| 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: 20140514 Termination date: 20210408 |
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| CF01 | Termination of patent right due to non-payment of annual fee |