CN101477925A - Thermal release device for plastic circuit breaker - Google Patents
Thermal release device for plastic circuit breaker Download PDFInfo
- Publication number
- CN101477925A CN101477925A CNA2008103066518A CN200810306651A CN101477925A CN 101477925 A CN101477925 A CN 101477925A CN A2008103066518 A CNA2008103066518 A CN A2008103066518A CN 200810306651 A CN200810306651 A CN 200810306651A CN 101477925 A CN101477925 A CN 101477925A
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- CN
- China
- Prior art keywords
- bimetal leaf
- heater element
- bimetallic strip
- heating element
- circuit breaker
- 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 invention relates to a heat tripping device of a moulded case circuit breaker; wherein, a connector of a heating element extends and forms a side edge forward arranged in parallel with and corresponding to a bimetallic strip; and a connector is extended and formed at the other end of the side edge. Through increasing the length of the heating element, the self resistance of the heating element is caused to be increased, so that the heating element performs the function of current limiting, and protects the bimetallic strip from easy fusion during high current breaking; under the conditions of constant heat quantity (Q), rated current of a switch can be further reduced, or short circuit breaking current can be limited; the current direction of the heating element is the same with the current direction of the bimetallic strip, so that the heating element and the bimetallic strip are caused to be mutually attracted; an insulation sheet is arranged between the heating element and the bimetallic strip, so that the bimetallic strip has low probability of deforming even if great suction exists between the heating element and the bimetallic strip; and a protection sheet is arranged on the bimetallic strip; therefore, when the bimetallic strip shorts, the bimetallic strip is protected from fusion.
Description
Technical field
The present invention relates to a kind of thermal release device for plastic circuit breaker.
Background technology
The existing thermal release device for plastic circuit breaker that is used for is made up of parts such as bimetal leaf, heater element, draw bars, wherein heater element is a sheet component that is " 1 " or " 7 " font, be connected with bimetal leaf, the bimetal leaf upper end all offers screwed hole and adjustment screw, and by adjustment screw adjustment product long delay performance, according to formula Q=I
2Rt in order to reach enough heats, in official hour t, under the certain situation of R, just must increase rated current (I), the also corresponding increase of rated current, so the required rated current (In) of this breaker of plastic casing will be bigger; The operation principle of thermal release device is to flow through thermal element or bimetal leaf when rated current; after after a while; bimetal leaf directly generate heat bending or the bending of induction heater element heat; being arranged on the bimetal leaf adjustment screw by adjustment again promotes draw bar; operating mechanism is threaded off; the circuit breaker disjunction realizes the overload protection to circuit.
When circuit was short-circuited, powerful short circuit current was by bimetal leaf, because the resistance of bimetal leaf is very big, according to formula Q=I
2The Rt instantaneous time, the huge heat greatly of the generation of bimetal leaf blows it.
Summary of the invention
The objective of the invention is to overcome the defective of prior art, a kind of more reasonable structure, thermal release device for plastic circuit breaker that operating efficiency is higher are provided.
For achieving the above object, the present invention adopts a kind of thermal release device for plastic circuit breaker, comprise bimetal leaf, heater element, insulating trip, insulating trip is arranged between bimetal leaf and the heater element, bimetal leaf and heater element close neighbour are provided with, one link of heater element extends to form the side with the parallel corresponding setting of bimetal leaf forward, and the other end of this side extends to form and the moving contact link.
For the sense of current that makes heater element identical with the sense of current of bimetal leaf, inhale mutually thereby make between the two, the present invention further is set to heater element and is divided into upper and lower two sections, and wherein upper semisection is inverted U, one side of inverted U extends to form lower semisection downwards, lower semisection and two gold
Belong to the sheet close neighbour and be provided with, the another side of inverted U extends to form a link to a side.
In order to protect bimetal leaf; the present invention further is set to be provided with screening glass at bimetal leaf topmost near heater element one side; form angle between screening glass lower end and the bimetal leaf; the conductive junction point that is provided with iron plate in the screening glass lower end and tilts inwardly, this connects and a little is arranged on the heater element front
The electric connecting terminal that the present invention further is set to heater element again is provided with 2 through holes, and 2 through holes of corresponding formation on the bimetal leaf make heater element constitute with bimetal leaf by two rivets and are connected.
The present invention is by increasing the length of heater element; make himself resistance increase; play metering function; the protection bimetal leaf makes it be difficult for fusing; and along with the heater element resistance increases; under the certain situation of heat (Q), it is littler the switch rated current can be done ground, also can limit short circuit breaking current.The sense of current of heater element is identical with the sense of current of bimetal leaf, inhales mutually thereby make between the two, owing to be provided with insulating trip between heater element and the bimetal leaf, therefore makes heater element and bimetal leaf be difficult for deforming.Because be provided with insulating trip between heater element and the bimetal leaf, even heater element and bimetal leaf have very big suction, bimetal leaf also is difficult for deforming.Screening glass is set on bimetal leaf, and when big electric current flow through, the electric power that heater element produces attracted screening glass, and the conductive junction point on the screening glass is linked to each other with heater element, makes the bimetal leaf short circuit, and the protection bimetal leaf is not fused.
Description of drawings
Fig. 1 is an embodiment of the invention stereogram.
Fig. 2 is an embodiment of the invention profile.
Fig. 3 is that the embodiment of the invention is removed understructure figure.
Fig. 4 is embodiment of the invention STRUCTURE DECOMPOSITION figure.
Fig. 5 is an embodiment of the invention heater element stereogram.
Fig. 6 is an embodiment of the invention screening glass stereogram.
Embodiment
As Fig. 1; 2; 3; shown in 4; specific embodiments of the invention are thermal release devices of a kind of breaker of plastic casing; comprise bimetal leaf 1; heater element 2 (Fig. 5); insulating trip 3; insulating trip 3 is arranged between bimetal leaf 1 and the heater element 2; the lower end of bimetal leaf 1 and heater element 2 all offers through hole 7; and by rivet 4 both connections of realization; heater element 2 is divided into; following two section (21; 22); wherein upper semisection 21 is inverted U; the right 212 of inverted U extends to form lower semisection 22 downwards; the link 221 of lower semisection 22 is provided with bimetal leaf 1 close neighbour; the left side 211 of inverted U extends to form electric connecting terminal 213 to a side; the wherein left side 212 on the upper semisection 21 and the parallel corresponding setting of bimetal leaf 1 forward; be provided with screening glass 5 (Fig. 6) at bimetal leaf 1 topmost near heater element 2 one sides; screening glass 5 upper ends and bimetal leaf 1 are by being welded to connect; form angle between screening glass 5 lower ends and the bimetal leaf 1; be provided with the contact screw 51 of inclination inwardly in screening glass 5 lower ends, upper semisection 21 close neighbours of these contact screw 51 lower ends and heater element 2 are provided with.
The foregoing description bimetal leaf 1 is realized both fixedlying connected with heater element 2 by rivet 4, also can adopt the mode of welding.
Be arranged on the conductive junction point that contact screw 51 conducts on the screening glass 5 contact with heater element in the foregoing description, also can adopt other similar structures.
The present invention is by the length of lengthening heater element 2; make himself resistance increase; play metering function; protection bimetal leaf 1 makes it be difficult for fusing; and along with heater element 2 resistances increase; under the certain situation of heat (Q), it is littler the switch rated current can be done ground, also can limit short circuit breaking current.The sense of current of heater element 2 is identical with the sense of current of bimetal leaf 1, inhales mutually thereby make between the two, owing to be provided with insulating trip between heater element 2 and the bimetal leaf 1, therefore makes heater element 2 and bimetal leaf 1 be difficult for deforming.Screening glass 5 is set on bimetal leaf 1, and purpose is that when big electric current flows through the electric power that heater element 2 produces attracts screening glass 5, and the conductive junction point on the screening glass 5 is linked to each other with heater element 2, makes bimetal leaf 1 short circuit, and protection bimetal leaf 1 is not fused.
Claims (4)
- [claim 1] a kind of thermal release device for plastic circuit breaker, comprise bimetal leaf, heater element, insulating trip, insulating trip is arranged between bimetal leaf and the heater element, bimetal leaf and heater element close neighbour are provided with, it is characterized in that: a link of heater element extends to form the side with the parallel corresponding setting of bimetal leaf forward, and the other end of this side extends to form link.
- [claim 2] thermal release device for plastic circuit breaker according to claim 1, it is characterized in that: described heater element is divided into upper and lower two sections, wherein upper semisection is inverted U, one side of inverted U extends to form lower semisection downwards, lower semisection and bimetal leaf close neighbour are provided with, and the another side of inverted U extends to form electric connecting terminal to a side.
- [claim 3] thermal release device for plastic circuit breaker according to claim 1 and 2; it is characterized in that: describedly be provided with screening glass topmost near heater element one side at bimetal leaf; the screening glass upper end is connected with bimetal leaf; form angle between screening glass lower end and the bimetal leaf; be provided with the contact of inclination inwardly in the screening glass lower end, the side close neighbour of this contact and heater element is provided with.
- [claim 4] thermal release device for plastic circuit breaker according to claim 1 and 2, it is characterized in that: a link of described heater element is provided with 2 through holes, 2 through holes of corresponding formation on the bimetal leaf make heater element constitute with bimetal leaf by rivet and are connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008103066518A CN101477925A (en) | 2008-12-30 | 2008-12-30 | Thermal release device for plastic circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008103066518A CN101477925A (en) | 2008-12-30 | 2008-12-30 | Thermal release device for plastic circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101477925A true CN101477925A (en) | 2009-07-08 |
Family
ID=40838607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008103066518A Pending CN101477925A (en) | 2008-12-30 | 2008-12-30 | Thermal release device for plastic circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101477925A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103632892A (en) * | 2012-08-22 | 2014-03-12 | 西门子公司 | Miniature circuit breaker and insulation sheet thereof |
-
2008
- 2008-12-30 CN CNA2008103066518A patent/CN101477925A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103632892A (en) * | 2012-08-22 | 2014-03-12 | 西门子公司 | Miniature circuit breaker and insulation sheet thereof |
| CN103632892B (en) * | 2012-08-22 | 2015-11-25 | 西门子公司 | Miniature circuit breaker and insulating trip thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: DELIXI ELECTRICAL ( NINGBO ) CO., LTD. Free format text: FORMER OWNER: DELIXI ELECTRIC APPLICANCE CO., LTD. Effective date: 20091030 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20091030 Address after: Postal code 1958, Jiangnan Road, Ningbo hi tech Zone, Zhejiang, China: 315000 Applicant after: Delixi Electrical (Ningbo) Co., Ltd. Address before: Yueqing City, Zhejiang province Liushi Delixi Industrial Park Post encoding: 325600 Applicant before: Delixi Electric Co., Ltd. |
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| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Open date: 20090708 |