CN107546080B - Small-sized circuit breaker - Google Patents
Small-sized circuit breaker Download PDFInfo
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- CN107546080B CN107546080B CN201610464871.8A CN201610464871A CN107546080B CN 107546080 B CN107546080 B CN 107546080B CN 201610464871 A CN201610464871 A CN 201610464871A CN 107546080 B CN107546080 B CN 107546080B
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- sealing element
- circuit breaker
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- rack
- moving contact
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Abstract
A miniature circuit breaker comprises a shell (1), an operating mechanism (2), a contact system (3), an arc extinguish chamber (4), a thermal tripping system (5), a sealing system (6) and an electromagnetic tripping system (7), wherein the contact system (3) comprises a moving contact (301) and a static contact (302).
Description
Technical Field
The invention belongs to the field of low-voltage electric appliances, and particularly relates to a miniature circuit breaker which improves the breaking reliability and stability of the circuit breaker.
Background
The low-voltage circuit breaker is divided into a miniature circuit breaker, a molded case circuit breaker and an air circuit breaker according to the application range, is an electric appliance which can be manually switched on and off and can automatically protect the faults of overload, short circuit and the like of the circuit, is functionally equivalent to the combination of a fuse and a relay, generally does not need to change parts after breaking the fault current, and has been widely applied.
The conventional structure of the small circuit breaker is generally divided into four areas: the magnetic trip device comprises a magnetic trip device area, an operating mechanism area, an arc extinguishing chamber area and an arc runner area, wherein a moving contact and a static contact are positioned in the operating mechanism area and fixed on the operating mechanism, and the arc runner area is arranged between the moving contact and the arc extinguishing chamber area. When short-circuit fault occurs, the moving contact and the static contact are opened under the action of electric repulsion and an operating mechanism to generate electric arc, the electric arc firstly passes through an arc runner and then enters a grid plate of an arc extinguish chamber under the action of arc blowing force, and the electric arc voltage is obviously increased and finally extinguished.
The short-circuit breaking capacity of the miniature circuit breaker is directly related to the arc voltage, and the faster the arc voltage rises, the higher the sustained peak value is, and the higher the short-circuit breaking capacity is. In the traditional structure, due to the existence of the arc runner area, the electric arc can enter the arc extinguish chamber only through the arc runner, so that the rising speed of the electric arc voltage is limited, and the short-circuit breaking capacity is reduced.
Disclosure of Invention
The invention aims to overcome the technical defects that the arc voltage rising speed is limited and the short-circuit breaking capacity is reduced because the arc moves for a long time before entering a grid plate in the arc runner area of the conventional miniature circuit breaker. A miniature circuit breaker is redesigned, and an arc runner area is cancelled, so that the rising speed of the arc voltage is greatly increased, and the short circuit breaking capacity is enhanced.
Technical scheme
In order to achieve the technical purpose, the invention designs a miniature circuit breaker, which comprises a shell, an operating mechanism, a contact system, an arc extinguish chamber, a thermal tripping system, a sealing system and an electromagnetic tripping system, wherein the contact system comprises a moving contact, and the miniature circuit breaker is characterized in that: the sealing system comprises a first shell rib, a second shell rib and a sealing element, the thermal tripping system comprises a bimetallic strip, the electromagnetic tripping system is located above the arc extinguish chamber, the contact system is located on the right side of the arc extinguish chamber, the operating mechanism is located on the right side of the electromagnetic tripping system and the arc extinguish chamber, the arc striking plate is located below the arc extinguish chamber, one end of the arc extinguish chamber stretches into the belly of the arc extinguish chamber, the other end of the arc extinguish chamber is connected with the bimetallic strip, one end of the moving contact penetrates through the sealing element and extends into the arc extinguish chamber, the other end of the moving contact is connected with a lower connecting rod of.
The sealing system comprises a first shell rib, a second shell rib and a sealing element, wherein the moving contact is arranged in the sealing element, and the first shell rib, the second shell rib, the sealing element, the inner wall of the shell, the static contact and the sealing element form a closed space to surround the arc extinguish chamber.
One end of the first shell rib is connected with the fixed contact, and the other end of the first shell rib is connected to the left side wall of the shell.
The sealing element comprises an upper sealing element and a lower sealing element, the moving contact is arranged in a sealing cavity formed by the upper sealing element and the lower sealing element, the head of the moving contact penetrates out of the sealing cavity and extends into the arc extinguish chamber, the tail of the moving contact extends out of the sealing cavity, the lower sealing element extends out of the protruding part, and two sides of the sealing element are connected with the static contact.
The operating mechanism comprises an upper four-bar linkage and a lower four-bar linkage, and the upper four-bar linkage and the lower four-bar linkage are connected in series;
the upper four-connecting rod comprises a handle, the handle is connected with the jump buckle through the handle connecting rod, the jump buckle is hinged to the upper rack, the lock catch is hinged to the upper rack, and the jump buckle stroke can be limited in the lock catch rotating process;
the lower four-bar linkage comprises a lower rack, the lower rack is connected with a moving contact through the lower linkage, the moving contact is arranged in a sealing element, one end of a tension spring is arranged on the lower rack, and the other end of the tension spring is arranged on the moving contact;
the upper frame and the lower frame are assembled together through a torsion spring, and the lock catch can be pushed to unlock the jump buckle in the movement process of the lower frame.
The lower rack is provided with a convex column, a torsion spring is sleeved on the convex column, one end of the torsion spring is clamped in a groove in the lower rack, the other end of the torsion spring is arranged in an installation groove of the upper rack, and the upper rack and the lower rack are arranged together side by side through the torsion spring.
The hook extends out of the lower rack, one end of the tension spring is hung on the hook, and the arc-shaped protruding portion is further arranged on the lower rack and can push the lock catch to release the locking of the jump buckle in the movement process of the lower rack.
The upper frame is provided with a stroke limiting groove, one end of the jump buckle is hinged on the upper frame, the other end of the jump buckle is connected with a handle connecting rod, and one end of the handle connecting rod is arranged on the jump buckle and deeply inserted into the stroke limiting groove.
Advantageous effects
The miniature circuit breaker provided by the invention has the advantages that an arc runner area is eliminated, so that the arc voltage rising speed is greatly increased, the short circuit breaking capacity is enhanced, the opening distance of the whole mechanism is large, the arc-blowing magnetic field is strong, the structure is simple, and the assembly is convenient.
Drawings
Fig. 1 is a diagram showing an internal layout structure of an embodiment of the present invention.
Fig. 2 is a schematic structural view of the first case rib and the second case rib in the embodiment of the present invention.
Fig. 3 is a structural schematic diagram of the movable contact mounting in the embodiment of the invention.
Fig. 4 is a schematic structural diagram of a movable contact in the embodiment of the invention.
Fig. 5 is a schematic structural view of a sealing member in an embodiment of the present invention.
Fig. 6 is a schematic structural view of an upper seal member in an embodiment of the present invention.
Fig. 7 is a schematic view of the structure of the lower seal member in the embodiment of the present invention.
Fig. 8 is a schematic view of the mounting structure of the operating mechanism in the embodiment of the present invention.
FIG. 9 is a schematic view of an upper four-bar linkage in an embodiment of the present invention.
FIG. 10 is a schematic view of a lower four-bar linkage in an embodiment of the present invention.
Fig. 11 is a schematic view of the mounting structure of the upper frame and the lower frame in the embodiment of the invention.
Fig. 12 is a schematic structural diagram of the upper frame in the front view direction in the embodiment of the invention.
Fig. 13 is a rear view structural schematic diagram of an upper frame in the embodiment of the invention.
Fig. 14 is a schematic structural view of the lower frame in the front view direction in the embodiment of the invention.
Fig. 15 is a rear view structural schematic diagram of a lower frame in the embodiment of the invention.
Fig. 16 is a schematic view of a torsion spring according to an embodiment of the present invention.
Detailed Description
The invention is further explained below with reference to the figures and examples.
Examples
As shown in fig. 1, a miniature circuit breaker includes a housing 1, an operating mechanism 2, a contact system 3, an arc extinguish chamber 4, a thermal trip system 5, a sealing system 6 and an electromagnetic trip system 7, wherein the contact system 3 includes a moving contact 301, and is characterized in that: sealing system 6 includes first casing muscle 601, second casing muscle 602 and sealing member 603, thermal tripping system 5 includes bimetallic strip 501, electromagnetic tripping system 7 is located explosion chamber 4 top, contact system 3 is located explosion chamber 4 right side, operating device 2 is located electromagnetic tripping system 7 and explosion chamber 4 right side, striking plate 8 is located explosion chamber 4 below, 4 abdomens of explosion chamber are stretched into to one end, the other end is connected with bimetallic strip 501, moving contact 301 one end is passed sealing member 603 and is extended to inside the explosion chamber 4, the other end is connected with operating device 2's lower connecting rod 2202, sealing member 603 forms sealed chamber with first casing muscle 601 and the joint of second casing muscle 602.
The sealing system 6 comprises a first casing rib 601, a second casing rib 602 and a sealing element 603, the movable contact 301 is arranged in the sealing element 603, the first casing rib 601, the second casing rib 602 and the sealing element 603, the inner wall 102 of the casing 1, the fixed contact 302 and the sealing element 603 form a closed space to enclose the arc extinguish chamber 4.
As shown in fig. 2, one end of the first casing rib 601 is connected to the fixed contact 302, and the other end is connected to the left sidewall of the casing 1.
As shown in fig. 3 to 7, the sealing member 603 includes an upper sealing member 6301 and a lower sealing member 6302, the moving contact 301 is installed in a sealing cavity formed by the upper sealing member 6301 and the lower sealing member 6302, a head portion 3201 of the moving contact 301 penetrates out of the sealing cavity and extends into the arc extinguish chamber 4, a tail portion 3202 extends out of the sealing member 603, the lower sealing member 6302 extends out of a protrusion 6302a, and two sides of the sealing member 603 are connected to the stationary contact 302.
As shown in fig. 8, the operating mechanism 2 includes an upper four-bar link 21 and a lower four-bar link 22, and the upper four-bar link 21 and the lower four-bar link 22 are connected in series;
as shown in fig. 9, the upper four-bar link 21 includes a handle 2101, the handle 2101 is connected with a jump buckle 2103 through the handle link 2102, the jump buckle 2103 is hinged on the upper frame 2104, a lock 2105 is hinged on the upper frame 2104, and the lock 2105 can limit the stroke of the jump buckle 2103 during the rotation process;
as shown in fig. 10, the lower four-bar linkage 22 includes a lower frame 2201, the lower frame 2201 is connected to the movable contact 301 through a lower bar linkage 2202, the movable contact 301 is installed in a sealing member 603, and one end of a tension spring 2205 is installed on the lower frame 2201 and the other end is installed on the sealing member 603; specifically, the lower seal 204b protrudes from the protrusion 204b01, and one end of the tension spring 205 is fitted into the tension spring hole 204b0101 of the protrusion 204b 01.
As shown in fig. 11 and 16, the upper frame 2104 and the lower frame 2201 are assembled together by the torsion spring 23, and the lower frame 2201 can push the lock 2105 to unlock the jump buckle 2103 during the movement.
As shown in fig. 14 and 15, the lower frame 2201 is provided with a convex column 2201a, the torsion spring 23 is sleeved on the convex column 2201a, one end of the torsion spring 23 is clamped in the groove 2201b of the lower frame 2201, the other end is arranged in the mounting groove 2104a of the upper frame 2104, and the upper frame 2104 and the lower frame 2201 are assembled together in parallel through the torsion spring 23.
The lower frame 2201 extends out of the hook 2201c, one end of the tension spring 2205 is hung on the hook 2201c, the lower frame 2201 is further provided with an arc-shaped protruding part 2201d, and the arc-shaped protruding part 2201d can push the lock 2105 to unlock the jump buckle 2103 in the movement process of the lower frame 2201.
As shown in fig. 12 and 13, the upper frame 2104 is provided with a travel limiting groove 2104b, one end of the jump buckle 2103 is hinged to the upper frame 2104, the other end is connected to the handle link 2102, and one end of the handle link 2102 is mounted on the jump buckle 2103 and extends into the travel limiting groove 2104 b.
The structure arrangement of the loop is optimized, and the maximum distance between the movable contact and the fixed contact is increased; the initial opening position of the moving contact is arranged in the grid, so that the arc striking magnetic field is strong, the electric arc reaches the belly of the grid in a short time, and the middle arcing time is greatly shortened; sealing devices are additionally arranged in the areas of the movable contact plate, the static contact plate and the arc extinguish chamber, and air pressure generated by the disjunction of the areas pushes electric arcs to move towards the abdomen of the arc extinguish chamber. The operating mechanism has a quick tripping function, and avoids the repeated arc discharge phenomenon caused by the falling back of the movable contact plate during the breaking. The short-circuit breaking capacity of the whole circuit breaker is enhanced.
The structure, ratio, size and the like shown in the drawings of the present embodiment are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the limit conditions of the present invention, so that the present invention has no technical essence, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the function and the achievable purpose of the present invention. In addition, the terms such as "upper", "lower", "left", "right", "middle", "clockwise" and "counterclockwise" used in the present specification are for clarity of description only, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not limited by the technical contents of the substantial changes, but also considered to be the scope of the present invention.
Claims (8)
1. The utility model provides a miniature circuit breaker, it includes casing (1), operating device (2), contact system (3), explosion chamber (4), thermal trip system (5), sealing system (6) and electromagnetism trip system (7), contact system (3) include moving contact (301), its characterized in that: the moving contact (301) is positioned on the right side of the arc extinguish chamber (4);
sealing system (6) include first casing muscle (601), second casing muscle (602) and sealing member (603), hot tripping system (5) are including bimetallic strip (501), and electromagnetic tripping system (7) are located explosion chamber (4) top, contact system (3) are located explosion chamber (4) right side, and operating device (2) are located electromagnetic tripping system (7) and explosion chamber (4) right side, and striking board (8) are located explosion chamber (4) below, and explosion chamber (4) belly is stretched into to one end, and the other end is connected with bimetallic strip (501), and moving contact (301) one end is passed sealing member (603) and is extended to inside explosion chamber (4), and the other end is connected with lower connecting rod (2202) of operating device (2), and sealing member (603) and first casing muscle (601) and second casing muscle (602) joint formation sealed chamber.
2. A miniature circuit breaker as set forth in claim 1, wherein: the sealing system (6) comprises a first shell rib (601), a second shell rib (602) and a sealing element (603), wherein the moving contact (301) is arranged in the sealing element (603), and the first shell rib (601), the second shell rib (602) and the sealing element (603), the inner wall (102) of the shell (1), the static contact (302) and the sealing element (603) form a closed space to surround the arc extinguish chamber (4).
3. A miniature circuit breaker as set forth in claim 2, wherein: one end of the first shell rib (601) is connected with the static contact (302), and the other end of the first shell rib is connected to the left side wall of the shell (1).
4. A miniature circuit breaker as set forth in claim 2, wherein: the sealing element (603) comprises an upper sealing element (6301) and a lower sealing element (6302), the moving contact (301) is arranged in a sealing cavity formed by the upper sealing element (6301) and the lower sealing element (6302), the head part (3201) of the moving contact (301) penetrates out of the sealing cavity and extends into the arc extinguish chamber (4), the tail part (3202) extends out of the sealing element (603), the lower sealing element (6302) extends out of the protruding part (6302a), and two sides of the sealing element (603) are connected with the static contact (302).
5. A miniature circuit breaker as set forth in claim 1, wherein: the operating mechanism (2) comprises an upper four-bar linkage (21) and a lower four-bar linkage (22), and the upper four-bar linkage (21) and the lower four-bar linkage (22) are connected in series;
the upper four-bar linkage (21) comprises a handle (2101), the handle (2101) is connected with a jump buckle (2103) through a handle connecting rod (2102), the jump buckle (2103) is hinged to the upper frame (2104), a lock catch (2105) is hinged to the upper frame (2104), and the travel of the jump buckle (2103) can be limited in the rotating process of the lock catch (2105);
the lower four-bar linkage (22) comprises a lower rack (2201), the lower rack (2201) is connected with the moving contact (301) through a lower connecting rod (2202), the moving contact (301) is arranged in the sealing element (603), one end of a tension spring (2205) is arranged on the lower rack (2201), and the other end of the tension spring is arranged on the moving contact (301);
the upper frame (2104) and the lower frame (2201) are assembled together through a torsion spring (23), and the lower frame (2201) can push the lock catch (2105) to unlock the jump buckle (2103) in the moving process.
6. A miniature circuit breaker as set forth in claim 5, wherein: the lower rack (2201) is provided with a convex column (2201a), the torsion spring (23) is sleeved on the convex column (2201a), one end of the torsion spring (23) is clamped in a groove (2201b) on the lower rack (2201), the other end of the torsion spring is arranged in an installation groove (2104a) of the upper rack (2104), and the upper rack (2104) and the lower rack (2201) are arranged together in parallel through the torsion spring (23).
7. A miniature circuit breaker as set forth in claim 5, wherein: the lower rack (2201) extends out of a hook (2201c), one end of a tension spring (2205) is hung on the hook (2201c), an arc-shaped protruding part (2201d) is further arranged on the lower rack (2201), and the arc-shaped protruding part (2201d) can push a lock catch (2105) to unlock a jump buckle (2103) in the moving process of the lower rack (2201).
8. A miniature circuit breaker as set forth in claim 5, wherein: the upper rack (2104) is provided with a stroke limiting groove (2104b), one end of the jump buckle (2103) is hinged to the upper rack (2104), the other end of the jump buckle is connected with the handle connecting rod (2102), and one end of the handle connecting rod (2102) is arranged on the jump buckle (2103) and is deeply inserted into the stroke limiting groove (2104 b).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610464871.8A CN107546080B (en) | 2016-06-23 | 2016-06-23 | Small-sized circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610464871.8A CN107546080B (en) | 2016-06-23 | 2016-06-23 | Small-sized circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107546080A CN107546080A (en) | 2018-01-05 |
| CN107546080B true CN107546080B (en) | 2019-12-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610464871.8A Active CN107546080B (en) | 2016-06-23 | 2016-06-23 | Small-sized circuit breaker |
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| Country | Link |
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| CN (1) | CN107546080B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN203038880U (en) * | 2012-12-21 | 2013-07-03 | 西门子公司 | Circuit breaker |
| CN203967003U (en) * | 2014-08-04 | 2014-11-26 | 浙江人民电器有限公司 | Novel small-sized circuit breaker |
| CN205789831U (en) * | 2016-06-23 | 2016-12-07 | 上海良信电器股份有限公司 | A kind of miniature circuit breaker |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9293282B2 (en) * | 2010-06-16 | 2016-03-22 | Eaton Corporation | Moving seal with arc creepage surface for an air circuit breaker |
-
2016
- 2016-06-23 CN CN201610464871.8A patent/CN107546080B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN203038880U (en) * | 2012-12-21 | 2013-07-03 | 西门子公司 | Circuit breaker |
| CN203967003U (en) * | 2014-08-04 | 2014-11-26 | 浙江人民电器有限公司 | Novel small-sized circuit breaker |
| CN205789831U (en) * | 2016-06-23 | 2016-12-07 | 上海良信电器股份有限公司 | A kind of miniature circuit breaker |
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| Publication number | Publication date |
|---|---|
| CN107546080A (en) | 2018-01-05 |
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