CN102074425A - Miniature circuit breaker - Google Patents
Miniature circuit breaker Download PDFInfo
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- CN102074425A CN102074425A CN 201110036201 CN201110036201A CN102074425A CN 102074425 A CN102074425 A CN 102074425A CN 201110036201 CN201110036201 CN 201110036201 CN 201110036201 A CN201110036201 A CN 201110036201A CN 102074425 A CN102074425 A CN 102074425A
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- guide rod
- contact
- circuit breaker
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Abstract
The invention discloses a miniature circuit breaker and belongs to the technical field of electrical equipment. The miniature circuit breaker comprises a stationary contact element, a movable contact element, an electromagnetic trip, and an operation mechanism, wherein the stationary contact element comprises a static guide rod and a stationary contact; the movable contact element comprises a movable guide rod and a movable contact; the electromagnetic trip comprises a coil and a striking rod with a striking end face; one end of the static guide rod is connected with the coil through a first connection surface; the stationary contact is fixed with the other end of the static guide rod through a second connection surface; one end of the movable guide rod is connected with the operation mechanism; and the movable contact is connected with the other end of the movable guide rod, and corresponds to the stationary contact; and the striking end face is matched with the operation mechanism. The miniature circuit breaker has the characteristics that: the first connection surface is positioned on one side of the striking rod and corresponds to the upper part of the striking rod; the second connection surface is positioned on the other side of the striking rod and corresponds to the lower part of the striking rod; and a passage is formed on the static guide rod corresponding to the striking end face of the striking rod. The miniature circuit breaker has the advantages that a self-excitation magnetic field in a contact area of the breaker is enhanced and current-limiting capacity of the breaker is improved.
Description
Technical field
The invention belongs to technical field of electric appliances, be specifically related to a kind of miniature circuit breaker, this kind miniature circuit breaker has current limiting capacity
Background technology
The effect of circuit breaker is that industry is known, under normal condition, guarantees that electric loop is the unimpeded of circuit; Break down when producing short circuit current or causing overcurrent when the loop, make electrical transmission circuit and supply network realize separating by overload.Circuit breaker generally includes dynamic and static contact group for this reason.Miniature circuit breaker utilizes magnetictrip to realize short-circuit protection; when the short circuit current that passes through in the coil during greater than the current value set, the moving iron core action of magnetictrip promotes to hit bar bump operating mechanism; make the operating mechanism release, drive moving contact and separate with quiet contact.
Existing miniature circuit breaker comprises quiet contact 1, moving contact 2, magnetictrip 3 and operating mechanism 4 as shown in Figure 1, and quiet contact 1 is made up of quiet guide rod 11 and fixed contact 12; Moving contact 2 is made up of moving guide rod 21 and moving contact 22; Magnetictrip 3 is by shown in Figure 2, comprises coil 31, guide cylinder 32, hits bar 33, yoke 34 and the moving iron core 35, static iron core 36 and the reaction spring 37 that are contained in the guide cylinder 32 are formed.One end of quiet guide rod 11 is electrically connected with coil 31 by first joint face 111, and fixed contact 12 is connected with the other end of quiet guide rod 11 by second joint face 121.
Under "on" position, electric current flows to moving contact 2 through quiet contact 1, because current opposite in direction through dynamic and static contact 2,1, therefore can produce electrodynamic repulsion force between the dynamic and static contact 2,1, because loop current is little, electrodynamic repulsion force makes contact 2 and quiet contact 1 keep on-state less than closing retention force, and the disjunction action of circuit breaker needs to wait for the triggering of magnetictrip 3.When short circuit current surpassed certain value, the electrodynamic repulsion force that moving contact 2 is subjected to was greater than closing retention force, and before magnetictrip 3 actions, moving contact 2 can carry out the disjunction campaign in advance.Increase the electrodynamic repulsion force that moving contact 2 is subjected to, can add the responsiveness of snap-action contact 2, shorten total break-time of circuit breaker, make circuit breaker actual short electric current have little time to increase, thereby improve the current limiting capacity of circuit breaker.
Aforesaid quiet guide rod 11 and moving guide rod 21 are referred to as parallel conductor, the computing formula of electrodynamic repulsion force between known two parallel conductors of foundation: 
, wherein, be illustrated among Fig. 1
For parallel conductor over against length; Be illustrated in d among Fig. 1 and be the distance between the parallel conductor.Increase parallel contact over against length
, can strengthen the self-excitation magnetic field in contact of breaker district, increase the electrodynamic repulsion force that moving contact 2 is subjected to, accelerate the breaking speed of circuit breaker.In addition, the enhancing in contact regions self-excitation magnetic field can also increase the magnetic blow-out power that electric arc is subjected to, and accelerates the transfer velocity of electric arc to arc control device.So, increase parallel contact over against length
Can improve the time limit stream ability of circuit breaker.
But, can see by structure shown in Figure 1, because two joint faces of quiet guide rod 11 are aforesaid first, second joint face 111,121 all is in the same side of hitting bar 33, this just make between the quiet guide rod 11 that is set parallel to each other (is example with dynamic and static guide rod 21,11 attracting states) and the moving guide rod 21 over against length
Be significantly less than the length of moving guide rod 21, can be used for producing the part that electrodynamic effective length only accounts for whole moving guide rod 21 on the promptly whole moving guide rod 21, thereby limited the raising of circuit breaker breaking capacity.
Certainly, increase between quiet guide rod 11 and the moving guide rod 21 over against length
Undoubtedly can strengthen the self-excitation magnetic field in contact of breaker district, increase the suffered electrodynamic repulsion force of moving contact 2, improve the breaking speed of circuit breaker, but, iff considering this factor, the space that will certainly cause dynamic and static guide rod 21,11 to account in the miniature circuit breaker location so increases, and runs counter to the trend toward miniaturization requirement of present pursuit.Therefore, how under the prerequisite of the existing installing space that guarantees miniature circuit breaker, to increase the technical problem that the electrodynamic repulsion force that moves contact 2 has become industry to pay close attention to and wish to solve always.To this, the applicant has carried out repeatedly and good try finds a way to resolve the problem, and technical scheme described below produces under this background
Summary of the invention
Task of the present invention is to provide a kind of installing space of both can having avoided increasing, and can increase the electrodynamic repulsion force that moving contact is subjected to again effectively and uses and guarantee miniaturization and accelerate breaking speed, improve the miniature circuit breaker of current limiting capacity.
Task of the present invention is finished like this, a kind of miniature circuit breaker, comprise quiet contact, moving contact, magnetictrip and operating mechanism, quiet contact comprises quiet guide rod and fixed contact, moving contact comprises moving guide rod and moving contact, magnetictrip comprises coil and has the strike bar that hits end face, wherein: an end of quiet guide rod is connected with described coil by first joint face, fixed contact is fixed by the other end of second joint face and quiet guide rod, one end of moving guide rod is connected with operating mechanism, the other end of moving contact and moving guide rod is fixed, and it is corresponding with fixed contact, described strike end face matches with operating mechanism, it is characterized in that: the position of described first joint face is in a side of described strike bar and corresponding to the top of hitting bar, and the position of described second joint face is in the opposite side that hits bar and corresponding to the bottom of hitting bar, offers one and be used for for hitting that bar passes and passage that described operating mechanism is hit on described quiet guide rod and at the position corresponding to the strike end face of described strike bar.
In a specific embodiment of the present invention, described passage is hole or groove.
In another specific embodiment of the present invention, described magnetictrip also comprises guide cylinder, yoke, is contained in dynamic and static iron core and reaction spring in the guide cylinder successively, described yoke constitutes U-shaped by first bent plate of an end and second bent plate of the other end, wherein, insulation is isolated between first bent plate and the described quiet guide rod.
In another specific embodiment of the present invention, described strike end face hits moving guide rod, causes the operating mechanism dropout after making guide rod turn over certain angle.
In of the present invention and then specific embodiment, described strike end face hits operating mechanism, and operating mechanism is threaded off.
Technical scheme provided by the invention, because with first, second contact-making surface lays respectively at the upper and lower of the strike bar of magnetictrip, thereby the length of quiet guide rod is significantly increased, because effectively prolonging between quiet guide rod and the moving guide rod over against length, the self-excitation magnetic field in contact of breaker district is strengthened, again because moving as parallel conductor, quiet guide rod electrodynamic repulsion force each other is with proportional over against length, the suffered electrodynamic repulsion force of contact is moved in can increase over against length after therefore increasing, improve the speed of scolding out of moving contact, shorten the break-time of circuit breaker, thereby improved the current limiting capacity of circuit breaker.
Description of drawings
Figure 1 shows that the schematic diagram of the miniature circuit breaker in the prior art.
Fig. 2 is the cutaway view of the magnetictrip of Fig. 1 configuration.
Fig. 3 is the example structure figure of miniature circuit breaker of the present invention.
Fig. 4 changes the schematic diagram that state is opened in the phase mutual exclusion for dynamic and static contact of the present invention into by closure state each other shown in Figure 3.
Fig. 5 is the front view of first embodiment of quiet contact of the present invention.
Fig. 6 is the front view of second embodiment of quiet contact of the present invention.
Fig. 7 is the armature of magnetictrip of the present invention and the schematic diagram that cooperates of quiet contact.
Embodiment
For the auditor that the makes Patent Office especially public can be expressly understood technical spirit of the present invention and beneficial effect more, the applicant general elaborates in the mode of embodiment below, but to the description of embodiment all is not restriction to the present invention program, any according to the present invention's design done only for pro forma but not substantial equivalent transformation all should be considered as technical scheme category of the present invention.
See also Fig. 3, a kind of miniature circuit breaker provided by the invention comprises: quiet contact 1(industry also is accustomed to being called fixed contact), moving contact 2(industry also is accustomed to being referred to as moving contact), magnetictrip 3 and operating mechanism 4, and comprise arc control device 6, quiet contact 1 comprises quiet guide rod 11 and fixed contact 12, moving contact 2 comprises moving guide rod 21 and moving contact 22, and magnetictrip 3 comprises coil 31, guide cylinder 32(also can claim fairlead), has the strike bar 33 that hits end face 331, yoke 34, be contained in the interior moving iron core 35 of cavity volume of guide cylinder 32 successively, reaction spring 37 and static iron core 36.One end of aforesaid quiet guide rod 11 is electrically connected with coil 31 by first joint face 111, fixed contact 12 is fixed by second joint face 121 and the other end of quiet guide rod 11, one end and the operating mechanism 4 of moving guide rod 21 are pivotally connected, moving contact 22 is fixed with the other end of moving guide rod 21, and it is corresponding with fixed contact 12, can or separate with the fixed contact contact, the strike end face 331 that hits bar 33 is corresponding with operating mechanism 4, so that by its strike or title bump operating mechanism 4, make operating mechanism 4 releases, drive moving contact 2 and separate with quiet contact 1.
Because magnetictrip 3 belongs to prior art, so the applicant does not remake more and gives unnecessary details.Operation principle roughly is: when switching device is in normal operating state, running current flows through coil 31, owing to have working gas gap between the dynamic and static iron core 35,36, moving iron core 35 is subjected to the electromagnetic attraction by the operating current generation, be subjected to the active force of reaction spring 37 simultaneously to it, the active force of reaction spring 37 is greater than electromagnetic attraction, and moving iron core 35 keeps static at maximum functional air gap place, the working gas gap relative fixed between the dynamic and static iron core 35,36.Yet, when producing short circuit current in the loop, short circuit current flows through coil 31, because moving iron core 35 is subjected to being far longer than by the electromagnetic attraction that short circuit current produces the reaction force of reaction spring 37, therefore under the active force that overcomes reaction spring 37, moving iron core 35 promotes to hit bar 33 to static iron core 36 adhesives (reaction spring 37 compressions this moment), by hitting bar 33 bump operating mechanisms 4.Operating mechanism 4 releases make contact 2 separate with quiet contact 1.
Continue to see Fig. 2, the quiet guide rod 11 of aforesaid quiet contact 1 is connected with circuit breaker end of incoming cables 5 by coil 31, and moving contact 2 is connected with circuit breaker leading-out terminal 8 by bimetal leaf 7.Aforesaid moving contact 22 contacts with fixed contact 12 and separates, and then realizes connection and the disjunction of miniature circuit breaker to the loop, and when moving contact 22 contacted with fixed contact 12, quiet guide rod 11 was parastate (Fig. 3 shows) with moving guide rod 21.(Fig. 7 shows) extended to the arc control device direction in the end of the driven guide rod 21 of last run-on tab 9a, last run-on tab 9a and following run-on tab 9b acting in conjunction, the electric Arc Motion direction that produces when being used to limit moving contact 22 and separating with fixed contact 12, electric arc is introduced arc control device 6, cut apart, cool off by the arc extinguishing grid pieces 61 in the arc control device 6, until extinguishing.
Key points in design as technical scheme provided by the invention: with location status shown in Figure 1 is example, the position of first joint face 111 of aforesaid quiet guide rod 11 is extended to a side of aforesaid strike bar 33, promptly corresponding to the top of hitting bar 33 is electrically connected with aforesaid coil 31, and with the position of second joint face 121 of aforesaid fixed contact 12 be in hit bar 33 opposite side promptly corresponding to the bottom of hitting bar 33, and on quiet guide rod 11 and at position, offer one and be used for for the passage 13 that hits that bar 33 passes and operating mechanism 4 is hit or directly moving guide rod 21 hit corresponding to the strike end face 331 that hits bar 33, this passage 13 also can be described as the bit port that allows that hits bar 33, promptly in order to avoid hitting stopping of bar 33.
Key points in design of the present invention is by being arranged at first joint face 111 and second joint face 121 respectively the both sides of the end of hitting bar 33, and offer the passage 13 that cooperates with the end of hitting bar 33 on the quiet guide rod 11, passage 13 be used to make the end of hitting bar 33 hit promptly that end face passes quiet guide rod 11 and with operating mechanism 4 interoperations, make effectively being extended between quiet contact 1 and the moving contact 2, thereby increase the self-excitation magnetic field in contact of breaker district over against length.Because it is proportional over against length as the electrodynamic repulsion force between the dynamic and static guide rod 21,11 of parallel guide rod and its, so can increase the electrodynamic repulsion force that moving contact 2 is subjected to after being lengthened out between quiet contact 1 and the moving contact 2 over against length, the speed of scolding out that adds snap-action contact 2, shorten total break-time of circuit breaker, thereby improve the current limiting capacity of circuit breaker.After the self-excitation magnetic field in contact of breaker district was increased, the magnetic blow-out power that electric arc is subjected to also was increased, and can accelerate the transfer velocity of electric arc to arc control device.
Ask for an interview Fig. 4 and Fig. 5, in the present embodiment, with aforesaid passage 13 design pore-formings, when hitting bar 33 actions, from the hole, stretch out, clash into operating mechanism 4 or directly clash into moving guide rod 21, make guide rod 21 towards the direction motion (Fig. 4 shows) that deviates from quiet guide rod 11, promptly dynamic and static contact 2,1 is changed into by closure state shown in Figure 3 and is scolded out state.
Ask for an interview Fig. 6, with aforesaid passage 13 design grooving, the function of groove is with the description in the hole that Fig. 5 is illustrated.
Ask for an interview Fig. 7, the yoke 34 of magnetictrip 3 constitutes U-shaped by first bent plate 341 of an end and second bent plate 342 of the other end, first bent plate 341 is parallel over against installation with quiet guide rod 11, and between first bent plate 341 and aforesaid quiet guide rod 11, adopt the insulant insulation to isolate insulant such as plastic insulation liner or insulating paper or other similar insulating part.Because first bent plate 341 be ferromagnetic material, can further strengthen the self-excitation magnetic field in breaker contact point district, the current limiting capacity of raising circuit breaker to its behind that is installed in quiet guide rod 11.
The applicant sketches operation principle of the present invention, when short circuit current flows through coil 31, moving, static iron core 35, produce electromagnetic attraction between 36, moving iron core 35 promotes to hit bar 33, strike end face 331 by the end of hitting bar 33 impacts (bump) operating mechanism 4, more particularly hit moving guide rod 21, cause operating mechanism 4 to be threaded off after making guide rod 21 turn over certain angle, certainly, the fit system of the magnetictrip of miniature circuit breaker and operating mechanism 4 is not limited to aforesaid way, also can impact operating mechanism 4, operating mechanism 4 is threaded off by the strike end face 331 that hits bar 33.
When fixed contact 12 contacts with moving contact 22, quiet guide rod 11 and moving guide rod 21 be set in parallel (Fig. 1 state), through the sense of current of quiet guide rod 11 and the current opposite in direction of moving guide rod 21, the magnetic field that quiet guide rod 11 produces makes guide rod 21 be subjected to electrodynamic repulsion force, when short circuit current surpasses certain value, the electrodynamic repulsion force that moving guide rod 21 is subjected to is greater than the closing retention force that is applied on the moving contact 2, and moving contact 2 just began to carry out the separating brake motion before the magnetictrip bump.
The both sides that first joint face 111 and second joint face 112 lay respectively at the strike end face 331 that hits bar 33 are, lay respectively at the upper and lower side of hitting bar 33, and offer the passage 13 that cooperates with the strike end face 331 that hits bar 33 on the quiet guide rod 11, passage 13 be used to make the strike end face 331 that hits bar 33 to pass quiet guide rod 11 and with operating mechanism 4 interoperations, make effectively being extended between quiet contact 1 and the moving contact 2, thereby increase the self-excitation magnetic field in contact of breaker district over against length.Because the electrodynamic repulsion force between the parallel guide rod and its are proportional over against length, so can increase the electrodynamic repulsion force that moving contact 2 is subjected to after being lengthened out between quiet contact 1 and the moving contact 2 over against length, the speed of scolding out that adds snap-action contact 2, total break-time of shortening circuit breaker.In addition, after the self-excitation magnetic field in contact of breaker district was increased, the magnetic blow-out power that electric arc is subjected to also was increased, and can accelerate the transfer velocity of electric arc to arc control device.Above factor all helps to improve the current limiting capacity of circuit breaker.
In sum, the present invention program extends to quiet guide rod 11 top of hitting bar 33 dexterously, and first joint face 111 is electrically connected with coil 31, the position of second contact-making surface 121 of fixed contact 12 is in the below of hitting bar 33, since prolonged between quiet guide rod 11 and the moving guide rod 21 over against length, thereby obtained beyond thought technique effect, therefore can yet be regarded as is a ultimate attainment technical scheme
Claims (5)
1. miniature circuit breaker, comprise quiet contact (1), moving contact (2), magnetictrip (3) and operating mechanism (4), quiet contact (1) comprises quiet guide rod (11) and fixed contact (12), moving contact (2) comprises moving guide rod (21) and moving contact (22), magnetictrip (3) comprises coil (31) and has the strike bar (33) of strike end face (331), wherein: an end of quiet guide rod (11) is connected with described coil (31) by first joint face (111), fixed contact (12) is fixed by second joint face (121) and the other end of quiet guide rod (11), one end of moving guide rod (21) is connected with operating mechanism (4), moving contact (22) is fixed with the other end of moving guide rod (21), and it is corresponding with fixed contact (12), described strike end face (331) matches with operating mechanism (4), it is characterized in that: the position of described first joint face (111) is in a side of described strike bar (33) and corresponding to the top of hitting bar (33), and the position of described second joint face (121) is in the opposite side that hits bar (33) and corresponding to the bottom of hitting bar (33), goes up and offers at the position corresponding to the strike end face (331) of described strike bar (33) one at described quiet guide rod (11) and be used for the passage (13) that described operating mechanism (4) hit for hitting bar (33) to pass.
2. a kind of miniature circuit breaker according to claim 1 is characterized in that described passage (13) is hole or groove.
3. a kind of miniature circuit breaker according to claim 1, it is characterized in that described magnetictrip (3) also comprises guide cylinder (32), yoke (34), is contained in dynamic and static iron core (35,36) and reaction spring (37) in the guide cylinder (32) successively, described yoke (34) constitutes U-shaped by first bent plate (341) of an end and second bent plate (342) of the other end, wherein, insulation is isolated between first bent plate (341) and the described quiet guide rod (11).
4. a kind of miniature circuit breaker according to claim 1 is characterized in that described strike end face (331) hits moving guide rod (21), causes operating mechanism (4) to be threaded off after making guide rod (21) turn over certain angle.
5. a kind of miniature circuit breaker according to claim 1 is characterized in that described strike end face (331) hits operating mechanism (4), and operating mechanism (4) is threaded off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110036201 CN102074425A (en) | 2011-02-11 | 2011-02-11 | Miniature circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110036201 CN102074425A (en) | 2011-02-11 | 2011-02-11 | Miniature circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102074425A true CN102074425A (en) | 2011-05-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110036201 Pending CN102074425A (en) | 2011-02-11 | 2011-02-11 | Miniature circuit breaker |
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| CN (1) | CN102074425A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102368451A (en) * | 2011-10-28 | 2012-03-07 | 法泰电器（江苏）股份有限公司 | Arc extinguish chamber device for circuit breaker |
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|---|---|---|---|---|
| CN2407450Y (en) * | 2000-01-29 | 2000-11-22 | 浙江德力西电器股份有限公司 | Actuating mechanism of small size circuit breaker |
| CN2550896Y (en) * | 2002-06-01 | 2003-05-14 | 常熟开关厂 | Electromagnetic actuating mechanism for breaker |
| CN101231926A (en) * | 2008-02-21 | 2008-07-30 | 江苏西蒙智控设备有限公司 | Actuating mechanism of small size circuit breaker |
| CN201689846U (en) * | 2010-06-02 | 2010-12-29 | 浙江天正电气股份有限公司 | Electromagnetic system for small sized breaker |
| CN202013859U (en) * | 2011-02-11 | 2011-10-19 | 常熟开关制造有限公司(原常熟开关厂） | Micro circuit breaker |
-
2011
- 2011-02-11 CN CN 201110036201 patent/CN102074425A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2407450Y (en) * | 2000-01-29 | 2000-11-22 | 浙江德力西电器股份有限公司 | Actuating mechanism of small size circuit breaker |
| CN2550896Y (en) * | 2002-06-01 | 2003-05-14 | 常熟开关厂 | Electromagnetic actuating mechanism for breaker |
| CN101231926A (en) * | 2008-02-21 | 2008-07-30 | 江苏西蒙智控设备有限公司 | Actuating mechanism of small size circuit breaker |
| CN201689846U (en) * | 2010-06-02 | 2010-12-29 | 浙江天正电气股份有限公司 | Electromagnetic system for small sized breaker |
| CN202013859U (en) * | 2011-02-11 | 2011-10-19 | 常熟开关制造有限公司(原常熟开关厂） | Micro circuit breaker |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102368451A (en) * | 2011-10-28 | 2012-03-07 | 法泰电器（江苏）股份有限公司 | Arc extinguish chamber device for circuit breaker |
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Application publication date: 20110525 |