CN107275163B - Circuit breaker and power distribution system - Google Patents
Circuit breaker and power distribution system Download PDFInfo
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- CN107275163B CN107275163B CN201710516851.5A CN201710516851A CN107275163B CN 107275163 B CN107275163 B CN 107275163B CN 201710516851 A CN201710516851 A CN 201710516851A CN 107275163 B CN107275163 B CN 107275163B
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- circuit breaker
- arc extinguishing
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- 238000009826 distribution Methods 0.000 title claims abstract description 17
- 230000007246 mechanism Effects 0.000 claims abstract description 204
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 65
- 230000003068 static effect Effects 0.000 claims abstract description 23
- 238000010891 electric arc Methods 0.000 claims abstract description 6
- 230000005672 electromagnetic field Effects 0.000 claims abstract description 4
- 238000005520 cutting process Methods 0.000 claims abstract description 3
- 230000001737 promoting effect Effects 0.000 claims abstract description 3
- 230000033001 locomotion Effects 0.000 claims description 5
- 238000009434 installation Methods 0.000 abstract description 17
- 230000009471 action Effects 0.000 description 8
- 230000000670 limiting effect Effects 0.000 description 6
- 238000000926 separation method Methods 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/24—Electromagnetic mechanisms
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/18—Means for extinguishing or suppressing arc
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
- H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Breakers (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention provides a circuit breaker and a power distribution system. The utility model provides a circuit breaker, includes contact mechanism, electromagnetism tripping device and arc extinguishing mechanism, wherein: the contact mechanism can break fault current in the circuit; the electromagnetic tripping mechanism comprises a static iron core, a movable iron core and a coil, wherein the coil is arranged to generate an electromagnetic field when receiving fault current, so that the static iron core drives the movable iron core to move along the axial direction to generate thrust for promoting the contact mechanism to release; the arc extinguishing mechanism is used for cutting off an electric arc generated when the contact mechanism breaks fault current; the electromagnetic tripping mechanism and the arc extinguishing mechanism are arranged on the same side of the contact mechanism, and the electromagnetic tripping mechanism is obliquely arranged relative to the arc extinguishing mechanism, so that the distance between the end part of the electromagnetic tripping mechanism, which is far away from the contact mechanism, and the arc extinguishing mechanism is greater than the distance between the end part of the electromagnetic tripping mechanism, which is close to the contact mechanism, and the arc extinguishing mechanism. The installation space of the arc extinguishing mechanism of the circuit breaker is increased, and the breaking capacity of the circuit breaker is improved.
Description
Technical Field
The invention belongs to the technical field of electrical switches, and particularly relates to a circuit breaker and a power distribution system.
Background
The circuit breaker is used as a protection element of the power transmission and distribution system, and can timely disconnect the circuit when abnormal current occurs in the circuit, so that the safety of the whole circuit and loads of other electrical appliances is guaranteed. Due to the rapid development of the power grid, the capacity of the power transmission and distribution system is continuously increased, the integration level of the system is continuously improved, the manufacturing cost is reduced in order to improve the flexibility of electric products, the management is convenient, the maximization of the number of control loops in a unit space is realized, and the size of the circuit breaker needs to be reduced to adapt to the installation space of the power transmission and distribution system.
Currently, a conventional circuit breaker is known to have a width of 18mm, a relatively large volume, and occupy a large space in the distribution box. In order to reduce the space occupied by the circuit breaker in the distribution box, the prior art provides a circuit breaker with a width of 9 mm. Although the 9mm width circuit breaker is small in size, the production and assembly difficulty of the product is increased, and the current specification of the circuit breaker can only reach 32A at most. In addition, due to the width limitation, the electromagnetic tripping mechanism cannot wind more coils; with the reduced width, the diameter of the core also needs to be reduced accordingly. Thus, for example, it is difficult to realize short-circuit transient protection for a circuit of a small current specification of only 1A or 2A, and the performance index of a 9 mm-wide circuit breaker is less than that of a 18 mm-wide circuit breaker.
Therefore, it is desirable to provide a new circuit breaker and power distribution system.
Disclosure of Invention
In order to effectively solve one or more defects in the prior art, the invention provides a circuit breaker and a power distribution system, which can achieve the purpose of reducing the space occupied by the circuit breaker and ensuring the breaking capacity of the circuit breaker.
In order to achieve the purpose, the invention adopts the following technical scheme:
according to an aspect of an embodiment of the present invention, there is provided a circuit breaker including a contact mechanism, an electromagnetic trip mechanism, and an arc extinguishing mechanism, wherein: the contact mechanism can break fault current in the circuit; the electromagnetic tripping mechanism comprises a static iron core, a movable iron core and a coil, wherein the coil is arranged to generate an electromagnetic field when receiving fault current, so that the static iron core drives the movable iron core to move along the axial direction to generate thrust for promoting the contact mechanism to release; the arc extinguishing mechanism is used for cutting off an electric arc generated when the contact mechanism breaks fault current; the electromagnetic tripping mechanism and the arc extinguishing mechanism are arranged on the same side of the contact mechanism, and the electromagnetic tripping mechanism is obliquely arranged relative to the arc extinguishing mechanism, so that the distance between the end part of the electromagnetic tripping mechanism, which is far away from the contact mechanism, and the arc extinguishing mechanism is greater than the distance between the end part of the electromagnetic tripping mechanism, which is close to the contact mechanism, and the arc extinguishing mechanism.
According to an aspect of the embodiment of the invention, the arc extinguishing mechanism comprises a plurality of arc extinguishing grid plates which are arranged at intervals and are parallel to each other, and the axial direction of the movable iron core of the electromagnetic tripping mechanism is not perpendicular to the arrangement direction of the arc extinguishing grid plates.
According to an aspect of the embodiment of the present invention, an angle formed between an axial direction of the movable iron core of the electromagnetic trip mechanism and a direction perpendicular to an arrangement direction of the arc chute pieces is 10 °.
According to one aspect of an embodiment of the present invention, the width of the circuit breaker is 9mm to 18 mm.
According to one aspect of an embodiment of the present invention, the width of the circuit breaker is 13.5 millimeters.
According to an aspect of the embodiment of the present invention, the electromagnetic trip mechanism further includes a rotatable trip lever, and the trip lever performs a rotational movement after the receiving portion thereof receives the pushing force of the plunger, thereby causing the output portion thereof to release the contact mechanism.
According to an aspect of the embodiment of the present invention, the axial direction of the movable iron core is tangential to the rotation locus of the receiving portion.
According to an aspect of the embodiment of the present invention, the electromagnetic trip mechanism further includes an arc striking plate for guiding an arc to enter the arc extinguishing mechanism, and the arc striking plate and the fixed contact of the contact mechanism are of an integrated structure or a split structure.
According to an aspect of an embodiment of the present invention, the electromagnetic trip mechanism further includes a core resetting unit for maintaining the movable core and the stationary core in a separated state in the absence of a fault current in the circuit.
According to another aspect of the embodiment of the invention, a power distribution system is also provided, which comprises the circuit breaker.
In summary, the circuit breaker and the power distribution system of the embodiment of the invention are provided with a contact mechanism, an electromagnetic tripping mechanism and an arc extinguishing mechanism. The electromagnetic tripping mechanism and the arc extinguishing mechanism are arranged on the same side of the contact mechanism, and the electromagnetic tripping mechanism is obliquely arranged relative to the arc extinguishing mechanism, so that the distance between the end part of the electromagnetic tripping mechanism, which is far away from the contact mechanism, and the arc extinguishing mechanism is greater than the distance between the end part of the electromagnetic tripping mechanism, which is close to the contact mechanism, and the arc extinguishing mechanism. Therefore, the electromagnetic tripping mechanism is installed in the circuit breaker in a mode that one end is close to the other end of the arc extinguishing mechanism and is far away from the arc extinguishing mechanism, and compared with the circuit breaker in the prior art, the installation space of the arc extinguishing mechanism can be increased on the premise that the whole volume of the circuit breaker is not increased, so that the installation quantity of arc extinguishing grid pieces is increased. The purpose of improving the arc extinguishing efficiency of the arc extinguishing mechanism is achieved, and the breaking capacity of the circuit breaker when abnormal current occurs in the circuit can be improved finally.
Drawings
The following drawings of the present application are included to provide an understanding of the present application. The embodiments illustrated in the drawings and described in the specification serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic view showing an overall structure of a circuit breaker according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a top view structure of the circuit breaker shown in fig. 1;
fig. 3 is a schematic perspective view illustrating a connection between an electromagnetic trip mechanism and a fixed contact according to an embodiment of the present invention;
fig. 4 is a schematic cross-sectional view showing a partial structure of an electromagnetic trip mechanism according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating an open state of the circuit breaker shown in fig. 1.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by describing examples thereof. The present invention is not limited to any particular configuration set forth below, but covers any modifications, substitutions, and improvements made to the structures and components of the present invention without departing from the spirit thereof. In the drawings and the following description, well-known structures and techniques are not shown to avoid unnecessarily obscuring the understanding of the technical solutions of the present invention.
For a better understanding of the present invention, a circuit breaker provided according to an embodiment of the present invention is described in detail below with reference to fig. 1 to 5. The following embodiments are described with reference to the directions in the drawings, and the structure of the circuit breaker of the present invention is not limited thereto.
Fig. 1 shows a schematic diagram of the overall structure of a circuit breaker 1 according to an embodiment of the present invention. As shown in fig. 1, according to an embodiment of the present invention, a circuit breaker 1 is connected to a power transmission and distribution system as a protection apparatus in a circuit, and includes: the electromagnetic trip device comprises a shell 10, a contact mechanism 40 arranged in the shell 10, an electromagnetic trip mechanism 20 and an arc extinguishing mechanism 30, wherein the arc extinguishing mechanism 30 and the electromagnetic trip mechanism 20 are arranged on the left side of the contact mechanism 40. The electromagnetic trip mechanism 20 has a first end 21 and a second end 22, the contact mechanism 40 includes a movable contact 42 and a stationary contact 41 that can be contacted with or separated from each other, and when a fault current, such as a short-circuit current, is generated in the circuit, the electromagnetic trip mechanism 20 triggers the contact mechanism 40 by generating an electromagnetic field, so as to separate the movable contact 42 from the stationary contact 41. Compared with the first end 21, the second end 22 of the electromagnetic trip mechanism is installed far away from the arc extinguishing mechanism 30, so that a larger installation space is reserved for the arc extinguishing mechanism 30 in the limited installation space of the electromagnetic trip mechanism 20 in the circuit breaker, the arc extinguishing mechanism 30 can more quickly extinguish the arc generated in the moment when the movable contact 42 and the fixed contact 41 are separated, and the arc extinguishing capability of the arc extinguishing mechanism is improved.
The arc extinguishing mechanism is an important influencing component of the circuit breaker which can quickly and reliably break the fault circuit. However, the internal structure of the miniature circuit breaker is compact, and the width of the miniature circuit breaker is limited, so that the installation space of the arc extinguishing mechanism is limited, and the current breaking performance of the circuit breaker is influenced. In the embodiment of the invention, the electromagnetic tripping mechanism is obliquely arranged relative to the arc extinguishing mechanism, so that the installation space of the arc extinguishing mechanism is increased. Therefore, on the premise of not increasing the whole volume of the circuit breaker, the arc extinguishing speed of the arc extinguishing mechanism can be increased by increasing the installation number of the arc extinguishing grid pieces, and the breaking capacity of the circuit breaker when the limit short-circuit current occurs in the circuit is further improved.
The housing 10 is made of an insulator material, and referring to fig. 2, fig. 2 is a schematic top view of the circuit breaker 1 according to the embodiment of the present invention. As shown in the drawings, the case 10 has two large sides 18 and 18 ', and a plurality of narrow sides 19 formed between the two large sides 18 and 18', and has an accommodating space therein to accommodate the constituent elements of the circuit breaker 1. The width of the housing 10 (i.e. the length B between the two larger sides 18 and 18') may be a standard width of 9mm or 18mm, but may also be any custom width between 9mm and 18mm, for example 14mm or 15mm, and is preferably 13.5 mm. The circuit breaker 1 of the embodiment of the invention adopts the scheme that the electromagnetic tripping mechanism 20 is obliquely arranged relative to the arc extinguishing mechanism 30, so that the circuit breaker is superior to the existing circuit breaker with the same size in arc extinguishing performance.
According to an embodiment of the present invention, as shown in fig. 1, the movable contact 42 in the contact mechanism 40 is movably disposed in the housing 10 through a connecting portion disposed corresponding to the movable contact, although the connecting portion and the movable contact 42 may be a separate structure or an integral structure, by movably disposing the connecting portion in the housing 10, the movable contact 42 can be driven to move between a contact position and a separation position with respect to the stationary contact 41 by rotating around a fixed rotating shaft, and one end of the contact holding member 14 is fixed in the housing 10, and the other end is fixedly connected to the connecting portion. Illustratively, in the present embodiment, the contact holding member 14 is an illustrated tension spring. The connecting portion is provided with a waist-shaped limiting hole, a limiting pin is disposed in the housing 10 corresponding to the limiting hole, and the connecting portion can drive the movable contact 42 to rotate around the limiting pin, so that the movable contact and the fixed contact of the contact mechanism can be kept at a disconnection position or a connection position by the cooperation of the contact holding member 14, the linkage mechanism 50, the limiting pin and other members.
Of course, the structure and the installation manner of the connection portion of the movable contact in the above embodiments are not limited thereto, as long as the impact force of the electromagnetic trip mechanism can be transmitted to the contact mechanism for triggering and separating the fixed contact, and the connection portion may also adopt other connection structures in other embodiments.
The movable contact 42 can also be driven by a linkage mechanism 50 mounted on the upper end thereof to contact or separate from the fixed contact 41, specifically, the linkage mechanism 50 includes: the handle 51, a bracket 53 arranged on the handle 51 and a locking part 52 connected between the bracket 53 and the connecting part concave slot in a matching way, the handle 51 forms two working positions under the matching action of the locking part 52, the concave slot, the tension of the reset part 15, the tension of the contact holding part 14 and the limit pin: an open position and a closed position.
When the circuit breaker needs to be disconnected, that is, the handle 51 is moved to the disconnection position (as shown in fig. 5), the linking mechanism 50 loses a clamping supporting force on the connecting portion under the combined action of the reset member 15, the handle 51, the bracket 53, and the locking member 52, the contact holding member 14 pulls the connecting portion to rotate around the limit pin, so that the movable contact 42 at the lower end of the connecting portion is separated from the fixed contact 41, and thus the contact mechanism 40 is opened (the movable contact and the fixed contact are separated), and at this time, the contact holding member 14 can cooperate with the linking mechanism 50 and the rotating shaft of the movable contact 42 to keep the contact mechanism 40 in.
When the circuit breaker needs to be closed, the handle 51 is moved to a closed position (as shown in fig. 1), the locking member 52 is engaged with the concave groove of the connecting portion under the combined action of the handle 51, the reset member 15, the contact holding member 14 and the limit pin, and the engaging force generated by the engagement is engaged with the contact holding member 14 and the limit pin to urge the movable contact 42 to be in contact with and conducted with the fixed contact 41, so that the contact mechanism 40 is closed again, and at this time, the contact holding member 14 can cooperate with the interlocking mechanism 50 and the rotating shaft of the movable contact 42 to keep the contact mechanism 40 in an engaged state.
The thermal trip mechanism 60 is connected between the movable contact 42 and the second connection terminal 13. The thermal trip mechanism 60 includes a bimetal 61, a hard connecting member 62 and a soft connecting wire 63, and an adjusting screw. One end of the bimetal 61 is connected to the movable contact 42 through a soft connection line 63, and the other end is connected to the second connection terminal 13 through a hard connection member 62.
One end of a fixed contact 41 in the contact mechanism 40 can be in contact conduction with a movable contact 42, and the other end is fixedly connected with the electromagnetic trip mechanism 20. Specifically, please refer to fig. 3 for a schematic perspective structure of the connection between the electromagnetic trip mechanism 20 and the stationary contact 41 according to the embodiment of the present invention, and fig. 4 for a schematic partial structural cross-sectional view of the electromagnetic trip mechanism 20 according to the embodiment of the present invention. As shown, the electromagnetic trip mechanism 20 has a first end 21 and a second end 22, and generally includes: the iron core is arranged in the iron core sleeve 23 and consists of a movable iron core 27 and a static iron core 27 ', the static iron core 27 ' is fixed on one side, close to the first end 21, of the iron core sleeve 23, the movable iron core 27 is movably arranged on the other side of the iron core sleeve 23 relative to the static iron core 27 ', a pushing component 28 is arranged on one side, facing the static iron core 27 ', of the movable iron core 27 in an extending mode, the pushing component 28 penetrates through the static iron core 27 ' and can extend out of the first end 21 of the electromagnetic tripping mechanism 20 to form an extending end to push the tripping rod 16, the tripping rod 16 rotates to enable the linkage mechanism 50 to trip, and then the movable contact 42 and the static contact 41 are separated. Illustratively, the pushing member 28 is a push rod, which may be an integral structure or a separate structure from the plunger 27. The moving iron core 27 and the static iron core 27' are provided with a pushing force for keeping a distance between them by an iron core reset component 29 sleeved on the pushing component 28, the iron core reset component 29 is a helical spring, although the iron core reset component 29 can be other structures capable of providing the pushing force.
The coil 24 is wound outside the iron core sleeve 23 corresponding to the position of the stationary iron core 27', two free ends formed by winding the coil 24 respectively correspond to the first end 21 and the second end 22 of the electromagnetic trip mechanism 20, the free end of the coil 24 corresponding to the first end 21 is connected with the stationary contact 41, and the stationary contact on the stationary contact 41 is arranged toward the movable contact 42 (as shown in fig. 1), and the free end of the coil 24 corresponding to the second end 22 is connected with the first connection terminal 12 through the conductor 25 (as shown in fig. 1), so that in the process of contacting and conducting the stationary contact 41 and the movable contact 42, the current flowing through the interior of the circuit breaker 1 passes through the coil 24 of the electromagnetic trip mechanism 20.
According to an embodiment of the present invention, an arc striking plate 26 is electrically connected between the coil 24 and the fixed contact 41, the arc striking plate 26 is located between the electromagnetic trip mechanism 20 and the arc extinguishing mechanism 30, one end of the arc striking plate 26 is electrically connected to the contact mechanism 40, and the other end of the arc striking plate is close to the arc extinguishing mechanism 30, so that the arc striking plate can serve as a resistor to provide a certain current limiting effect for a large current flowing through the interior of the circuit breaker when an abnormal large current occurs in a circuit, and further improve the overall breaking performance of the circuit breaker. In this embodiment, the arc ignition plate 26 and the fixed contact 41 are in a split structure, but the invention is not limited thereto, and in other embodiments, the arc ignition plate 26 and the fixed contact 41 may also be in an integrated structure, that is, separate welding and installation processes are not required, thereby simplifying the structure of the circuit breaker.
The trip lever 16 is hinged in the circuit breaker by a rotating shaft and is mounted close to the first end 21 of the electromagnetic trip mechanism 20, rotating under the pushing action of the protruding end of the pushing member 28. Specifically, the trip bar 16 includes a receiving portion and an output portion, the receiving portion can swing around the rotating shaft in a manner similar to a pendulum after receiving the impact of the movable iron core 27, so as to form an arc-shaped swing track, and the output portion can disengage the locking member 52 from the concave snap-fit groove of the connecting portion through the swing motion of the trip bar 16, i.e., complete the trip motion, so as to urge the movable contact 42 to move away from the stationary contact 41 under the cooperation effect of the contact holding member 14 and the limit pin, and maintain the disconnected state between the movable contact and the stationary contact 41.
Of course, the structure and the arrangement of the trip bar 16 in the above embodiments are not limited to this, as long as the locking member 52 can be disengaged from the concave slot of the connecting portion under the impact of the electromagnetic trip mechanism, so as to facilitate the separation of the moving contact and the stationary contact, and the trip bar may also adopt a structure that performs a reciprocating motion by means of an elastic restoring force in other embodiments.
The arc extinguishing mechanism 30 includes an isolation support member and arc chute plates 31 arranged in a plurality of gaps formed by the isolation support member, and the arc chute plates 31 are arranged in a stacked manner in the same direction. The arc extinguishing mechanism 30 is mounted in the housing 10 relative to the electromagnetic trip mechanism 20 at a position close to the rear side wall 11 of the housing 10 and adjacent to the side of the second end 22 of the electromagnetic trip mechanism 20. The electromagnetic trip mechanism 20 is disposed in such a way that the second end 22 is farther away from the arc extinguishing system 30 than the first end 21, so that the moving axis (shown as the axis) of the movable iron core 27 of the electromagnetic trip mechanism 20 is not perpendicular to the arrangement direction of the arc extinguishing bars of the arc extinguishing mechanism 30. That is, the electromagnetic trip mechanism 20 is installed in the housing 10 to be rotated by a predetermined angle with respect to a direction perpendicular to the arrangement direction of the arc chute pieces 31, centering on the first end 21 thereof (i.e., the striking position against the trip bar 16). For example, the angle of the included angle between the moving axis of the movable iron core 27 of the electromagnetic trip mechanism 20 and the perpendicular direction of the arrangement direction of the arc-extinguishing grid pieces 31 can be set to 10 °, and when the included angle is set to 10 °, the installation number of the arc-extinguishing grid pieces 31 in the arc-extinguishing mechanism 30 can be increased without increasing the volume of the circuit breaker 1, and the breaking performance of the circuit breaker 1 is effectively improved. The preset angle is also determined by the overall height of the housing 10 (i.e., the distance from bottom to top as shown in the figure), and the overall height of the housing 10 is determined by rotating the moving axis of the movable iron core 27 of the electromagnetic trip mechanism 20 by the preset angle relative to the direction perpendicular to the arrangement direction of the arc extinguishing bars, so that the electromagnetic trip mechanism 20 can drive the pushing component 28 to move to the impact position on the trip bar 16 through the movable iron core 27 to complete the trip operation, thereby facilitating the separation between the movable contact 42 and the stationary contact 41.
Since the arc extinguishing mechanism 30 is disposed below the electromagnetic trip mechanism 20 and close to the second end 22, so that the arc extinguishing mechanism 30 can be away from the striking position in the transverse direction, more installation space can be reserved for the arc extinguishing mechanism 30 installed below the electromagnetic trip mechanism 20 by disposing the second end 22 of the electromagnetic trip mechanism 20 away from the arc extinguishing mechanism 30. Since the moving axis of the movable iron core 27 of the electromagnetic trip mechanism 20 is set to rotate a predetermined angle around the position of the first end 21, the impact position on the trip lever 16 is still on the swing track (i.e. the circular track shown in the figure) of the receiving portion of the trip lever 16, and the impact force on the trip lever 16 is not affected. Because the internal structure of the miniature circuit breaker is installed compactly and the width is limited, the installation space of the arc extinguishing mechanism is limited. Compared with the circuit breaker in the prior art in which the electromagnetic tripping mechanism is arranged in parallel with the rear side surface of the shell and the arc extinguishing mechanism, the circuit breaker 1 of the embodiment of the invention can increase the installation space of the arc extinguishing mechanism 30 on the premise of not increasing the overall volume of the circuit breaker, thereby increasing the installation number of arc extinguishing grids, further achieving the purpose of improving the arc extinguishing efficiency of the arc extinguishing mechanism 30, and finally improving the breaking capacity of the circuit breaker 1 when abnormal current occurs in the circuit.
Through the accommodation space of reasonable utilization circuit breaker shell, optimize circuit breaker 1 structure, change electromagnetic tripping mechanism 20's installation axis, compare the mode of electromagnetic tripping mechanism and arc extinguishing mechanism parallel mount, can also increase the air gap between the partial structure in the circuit breaker 1 to can increase the inside circulation of air of circuit breaker 1, avoid inside heat to pile up, further improve the stability and the reliability of circuit breaker 1 work. Compared with the circuit breaker with the same width (thickness) in the prior art, the circuit breaker 1 of the embodiment of the invention has stronger breaking capacity.
Of course, the mutual position relationship, shape and structure between the moving and static iron cores in the electromagnetic trip mechanism in the above embodiment are not limited to this, as long as the electromagnetic trip mechanism 20 can trigger the contact mechanism to break under the driving action of the magnetic field generated by the coil. In addition, in other embodiments, in the electromagnetic trip mechanism 20, the movable iron core may also be disposed inside the stationary iron core, and the movable iron core may also indirectly trigger the contact mechanism through other pushing components capable of transmitting the pushing force, and the cross-sectional shapes of the movable iron core and the stationary iron core are not limited to a circular structure, and the cross-sectional shapes may also be square or other shapes. For example, the cross section of the movable iron core and the static iron core can also be square. Correspondingly, the structure of the coil is not limited to a wire form, and the coil can also be other conductors which can be used for current circulation and can be wound on the outer side of the static iron core, so that the second end of the electromagnetic tripping mechanism can be arranged far away from the arc extinguishing mechanism, and the purpose of reserving a larger installation space for the arc extinguishing mechanism can be realized.
The arc striking member 70 has an arc striking end corresponding to the contact mechanism 40, and the other end thereof is a discharge end corresponding to the arc extinguishing mechanism 30, the arc striking end having a linear structure, and the discharge end having an arc structure. When the moving contact and the static contact are separated to generate an electric arc instantly, under the action of a self-excitation magnetic field generated by the moving contact and the static contact of the contact mechanism 40, the electric arc moves towards the arc extinguishing mechanism 30 along the arc striking component 70 and enters the arc extinguishing mechanism 30. Since the arc extinguishing mechanism 30 in the embodiment of the present invention has more arc chute pieces 31, the arc can be cut into more series-connected arcs, so that the arc voltage rises rapidly, the current rise is limited, and the arc voltage is higher than the line system voltage, thereby facilitating the arc to be extinguished more rapidly.
The operation principle of the electromagnetic trip mechanism 20 and the thermal trip mechanism 60 will be described with reference to fig. 1 to 5:
the magnetic field generated by the coil 24 of the electromagnetic trip mechanism 20 under the normal current action is smaller than the thrust force of the iron core resetting component 29 to the moving iron core and the static iron core, so that the moving iron core and the static iron core keep distance and are relatively static in the iron core sleeve 23. When a short-circuit current in the circuit flows through the coil 24, the coil 24 generates a strong magnetic field to attract the movable iron core 27 and the stationary iron core 27 ', the iron core 27 moves toward the stationary iron core 27', and the pushing member 28 is pushed out from the first end 21. After the pushing member 28 reaches the striking position of the first end 21 on the trip bar 16, the trip bar 16 is struck, the trip bar 16 swings counterclockwise around the rotating shaft, the tripping operation is completed, and finally the movable contact 42 is urged to move away from the fixed contact 41. Therefore, the separation between the movable contact 42 and the fixed contact 41 is interrupted, i.e. the internal circuit of the circuit breaker 1 is broken, and the handle 51 is moved to the open position (as shown in fig. 5).
The moving axis of the movable iron core 27 of the electromagnetic trip mechanism 20 is set to rotate a preset angle around the position of the first end 21, and the impact position of the moving axis on the trip bar 16 is still on the swing arc of the receiving part of the trip bar 16, so the electromagnetic trip mechanism 20 after the position of the moving axis is changed does not affect the impact force on the trip bar 16.
When an overcurrent occurs in the circuit during the process of making the contact mechanism 40 conduct, the bimetal 61 is heated to generate bending deformation, and the tripping member 17 arranged above is pushed to remove the locking member 52 from the concave slot of the connecting portion. Meanwhile, the pulling force of the contact holding component 14 is matched to break the contact mechanism 40 and keep the contact mechanism 40 in the off state, and the handle 51 is indirectly driven and kept in the off position.
After the fault in the circuit is cleared, the toggle handle 51 rotates counterclockwise, and the movable contact 42 and the fixed contact 41 recover the contact conduction state (as shown in fig. 1) under the combined action of the locking component 52, the contact holding component 14, the positioning pin and the like. At the same time, the strong induced magnetic field generated by the coil 24 disappears, and the movable iron core 27 and the static iron core 27' return to the initial state separated by a predetermined distance under the thrust of the iron core resetting component 29, so as to prepare for the next trip (i.e. separation of the movable and static heads).
According to an embodiment of the present invention, there is also provided a power distribution system including the circuit breaker, and therefore, the advantages of the power distribution system are the same as those of the circuit breaker, and thus, the description thereof is omitted.
The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Also, different features that are present in different embodiments may be combined to advantage. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art upon studying the drawings, the specification, and the claims.
Claims (8)
1. The utility model provides a circuit breaker, includes contact mechanism, electromagnetism tripping device and arc extinguishing mechanism, wherein:
the contact mechanism can break fault current in the circuit;
the electromagnetic tripping mechanism comprises a static iron core, a movable iron core and a coil, wherein the coil is arranged to generate an electromagnetic field when receiving the fault current, so that the static iron core drives the movable iron core to move along the axial direction to generate thrust for promoting the contact mechanism to release;
the arc extinguishing mechanism is used for cutting off an electric arc generated when the contact mechanism breaks the fault current;
the electromagnetic tripping mechanism and the arc extinguishing mechanism are arranged on the same side of the contact mechanism, and the electromagnetic tripping mechanism is obliquely arranged relative to the arc extinguishing mechanism, so that the distance between the end part of the electromagnetic tripping mechanism, which is far away from the contact mechanism, and the arc extinguishing mechanism is larger than the distance between the end part of the electromagnetic tripping mechanism, which is close to the contact mechanism, and the arc extinguishing mechanism;
the electromagnetic tripping mechanism further comprises an arc striking plate for guiding the electric arc to enter the arc extinguishing mechanism, the arc striking plate is electrically connected between the coil and the fixed contact of the contact mechanism, the arc striking plate is positioned between the electromagnetic tripping mechanism and the arc extinguishing mechanism, and the arc striking plate and the fixed contact of the contact mechanism are of an integrated structure or a split structure;
the arc extinguishing mechanism comprises a plurality of arc extinguishing bars, the arc extinguishing bars are arranged at intervals along the height direction of the circuit breaker and are parallel to each other, and the axial direction of a movable iron core of the electromagnetic tripping mechanism is not perpendicular to the arrangement direction of the arc extinguishing bars.
2. The circuit breaker of claim 1, wherein an angle formed between an axial direction of the movable iron core of the electromagnetic trip mechanism and a direction perpendicular to an arrangement direction of the arc chute pieces is 10 °.
3. The circuit breaker of claim 1, wherein the width of the circuit breaker is 9 millimeters to 18 millimeters.
4. The circuit breaker of claim 3, wherein the width of the circuit breaker is 13.5 millimeters.
5. The circuit breaker of claim 1, said electromagnetic trip mechanism further comprising a rotatable trip bar that undergoes rotational movement after its receiving portion receives the urging force of said plunger, thereby causing its output portion to release said contact mechanism.
6. The circuit breaker of claim 5, wherein an axial direction of the plunger is tangential to a rotational trajectory of the receiving portion.
7. The circuit breaker of claim 1, said electromagnetic trip mechanism further comprising a plunger reset assembly for maintaining said moving plunger and said stationary plunger in a disengaged state in the absence of a fault current in the circuit.
8. An electrical distribution system comprising a circuit breaker as claimed in any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710516851.5A CN107275163B (en) | 2017-06-29 | 2017-06-29 | Circuit breaker and power distribution system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710516851.5A CN107275163B (en) | 2017-06-29 | 2017-06-29 | Circuit breaker and power distribution system |
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| Publication Number | Publication Date |
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| CN107275163A CN107275163A (en) | 2017-10-20 |
| CN107275163B true CN107275163B (en) | 2020-09-04 |
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| CN201710516851.5A Active CN107275163B (en) | 2017-06-29 | 2017-06-29 | Circuit breaker and power distribution system |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109036990B (en) * | 2018-08-20 | 2024-03-19 | 厦门大恒科技有限公司 | Hydraulic electromagnetic trip switch and circuit breaker |
| CN108777244B (en) * | 2018-08-20 | 2023-11-03 | 厦门大恒科技有限公司 | Energy storage hydraulic circuit breaker and overcurrent protection equipment |
| CN112614758B (en) * | 2020-12-07 | 2024-08-09 | 国网福建省电力有限公司检修分公司 | A quick operating mechanism for circuit breaker |
| CN113161211B (en) * | 2021-04-30 | 2024-09-24 | 科都电气股份有限公司 | Circuit breaker device |
| CN115705980B (en) * | 2021-08-05 | 2025-10-21 | 上海良信电器股份有限公司 | Operating mechanism and circuit breaker |
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|---|---|---|---|---|
| GB1407067A (en) * | 1971-12-02 | 1975-09-24 | Legrand Sa | Circuit breakers |
| CN202443927U (en) * | 2012-01-20 | 2012-09-19 | 乐清市国隆电气有限公司 | Small circuit breaker |
| CN106531580A (en) * | 2016-11-09 | 2017-03-22 | 首瑞（天津）电气设备有限公司 | Micro breaker and distribution system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201160057Y (en) * | 2008-01-14 | 2008-12-03 | 上海电器科学研究所（集团）有限公司 | Selective protection switch |
| CN205122518U (en) * | 2015-11-20 | 2016-03-30 | 浙江信基电气股份有限公司 | Breaker tripping device |
| CN206947279U (en) * | 2017-06-29 | 2018-01-30 | 首瑞（天津）电气设备有限公司 | Breaker and distribution system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1407067A (en) * | 1971-12-02 | 1975-09-24 | Legrand Sa | Circuit breakers |
| CN202443927U (en) * | 2012-01-20 | 2012-09-19 | 乐清市国隆电气有限公司 | Small circuit breaker |
| CN106531580A (en) * | 2016-11-09 | 2017-03-22 | 首瑞（天津）电气设备有限公司 | Micro breaker and distribution system |
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| CN107275163A (en) | 2017-10-20 |
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