CN113363120A - Small-sized circuit breaker - Google Patents
Small-sized circuit breaker Download PDFInfo
- Publication number
- CN113363120A CN113363120A CN202010152847.7A CN202010152847A CN113363120A CN 113363120 A CN113363120 A CN 113363120A CN 202010152847 A CN202010152847 A CN 202010152847A CN 113363120 A CN113363120 A CN 113363120A
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- China
- Prior art keywords
- temperature control
- circuit breaker
- bimetallic strip
- moving contact
- partition plate
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- 238000005192 partition Methods 0.000 claims abstract description 63
- 239000004020 conductor Substances 0.000 claims abstract description 54
- 230000003068 static effect Effects 0.000 claims abstract description 9
- 230000000670 limiting effect Effects 0.000 claims description 19
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000010891 electric arc Methods 0.000 claims description 2
- 230000020169 heat generation Effects 0.000 abstract description 2
- 238000013459 approach Methods 0.000 description 3
- 238000012795 verification Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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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
- H01H71/14—Electrothermal mechanisms
- H01H71/16—Electrothermal mechanisms with bimetal element
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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
- H01H71/02—Housings; Casings; Bases; Mountings
- H01H71/0207—Mounting or assembling the different parts of the circuit breaker
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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
- H01H71/02—Housings; Casings; Bases; Mountings
- H01H71/0207—Mounting or assembling the different parts of the circuit breaker
- H01H71/0221—Majority of parts mounted on central frame or wall
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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
- H01H71/50—Manual reset mechanisms which may be also used for manual release
- H01H71/505—Latching devices between operating and release mechanism
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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
- H01H71/50—Manual reset mechanisms which may be also used for manual release
- H01H71/52—Manual reset mechanisms which may be also used for manual release actuated by lever
- H01H71/526—Manual reset mechanisms which may be also used for manual release actuated by lever the lever forming a toggle linkage with a second lever, the free end of which is directly and releasably engageable with a contact structure
Abstract
A miniature circuit breaker comprises a shell and a handle, wherein an overload protection device and an operating mechanism connected with a moving contact are arranged in the shell, the overload protection device comprises a temperature control assembly with a bimetallic strip, a wire inlet end connecting terminal connected with the moving contact is arranged on one side, close to the moving contact, in the shell, a static contact matched with the moving contact is arranged on one side of the moving contact, the temperature control assembly is arranged on the other side of the moving contact, and the temperature control assembly drives the temperature control protection device arranged on the shell to trigger the circuit breaker to trip when overload occurs; the temperature control protection device comprises a partition plate and a thermal trip rod, wherein the moving contact and the thermal trip rod are separated in two different planes by the partition plate; the temperature control assembly comprises a bimetallic strip and a current-carrying conductor, and when the circuit breaker is overloaded, the movable end of the bimetallic strip drives the thermal trip rod to rotate to trigger the circuit breaker to trip. The invention shortens the length of the current-carrying conductor of the temperature control component, reduces the internal resistance and the heat generation, and avoids the damage of parts caused by overhigh temperature rise of the temperature control component.
Description
Technical Field
The invention relates to the technical field of low-voltage electric appliances, in particular to a miniature circuit breaker.
Background
The overload protection device in the low-voltage terminal type miniature circuit breaker is not easy to control the delay verification characteristic of rated current of 100A or above, and is mainly embodied in that the delay verification time and the temperature rise cannot be well considered. At present, the most commonly adopted mode of the circuit breaker is to carry out current shunt on the overload protection device, the influence on the temperature rise of the circuit breaker is reduced by reducing the heating of the bimetallic element, but the maximum influence of the current shunt on the overload protection device is that the short delay verification time is longer and more discrete, so that the production efficiency and the qualification rate of products are greatly reduced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a miniature circuit breaker with simple structure and high reliability.
In order to achieve the purpose, the invention adopts the following technical scheme:
a miniature circuit breaker comprises a shell and a handle arranged on the shell, wherein an overload protection device and an operating mechanism connected with a moving contact are arranged in the shell, the overload protection device comprises a temperature control component with a bimetallic strip, one side, close to the moving contact, in the shell is provided with a wire inlet end wiring terminal connected with the moving contact, one side of the moving contact is provided with a static contact matched with the moving contact, the other side of the moving contact is provided with a temperature control component, the overload protection device also comprises a temperature control protection device, and the temperature control component drives the temperature control protection device arranged in the shell to trigger the circuit breaker to trip in overload; the temperature control protection device comprises a partition plate and a thermal trip rod, the thermal trip rod can rotate on the partition plate to trigger the circuit breaker to trip, and the moving contact and the thermal trip rod are separated in two different planes by the partition plate; the temperature control assembly comprises a bimetallic strip and a current-carrying conductor, wherein the fixed end of the bimetallic strip is positioned on the shell close to one side of the moving contact, the bimetallic strip is connected with a wiring terminal of a wire inlet end through the current-carrying conductor, and when the circuit breaker is overloaded, the bimetallic strip is heated and bent, so that the movable end of the bimetallic strip drives the thermal trip rod to rotate to trigger the circuit breaker to trip and break.
Further, temperature control assembly still includes the support that is used for fixed mounting bimetallic strip and current-carrying conductor, the one end of support is connected with the stiff end of bimetallic strip, and the other end of support forms the bifurcation structure with the expansion end of bimetallic strip to the other end of support is used for being connected with the regulating part that sets up in casing one side.
Furthermore, a first critical point, a second critical point and a limiting part are arranged on the partition board, the first critical point and the second critical point are used for being in limiting fit with the thermal trip rod, the middle part of the thermal trip rod is rotatably installed on the partition board, one end of the thermal trip rod is used as an unlocking end to penetrate through a gap between the first critical point and the second critical point to be matched with the operating mechanism, and the other end of the thermal trip rod is used as a driving end to be matched with the movable end of the bimetallic strip; the limiting part is used for limiting and matching with the bimetallic strip.
Furthermore, the whole partition board is in a right-angled triangle shape, a mandrel for rotatably mounting the thermal trip rod is arranged at the upper part of the partition board, two bulges are arranged at one side of the mandrel close to the operating mechanism and respectively used as a first critical point and a second critical point, the first critical point is positioned at one side close to the temperature control assembly, and the second critical point is positioned at one side far away from the temperature control assembly; the partition board is provided with a longitudinal convex rib, the middle part of the convex rib is provided with a groove serving as a limiting part, and the movable end of the bimetallic strip penetrates through the groove to be matched with the driving end of the thermal trip rod.
Furthermore, the current-carrying conductor comprises a current-carrying plate, a first soft conductor and a second soft conductor, one end of the current-carrying plate is connected with the wiring terminal of the incoming line end, the other end of the current-carrying plate is connected with the second soft conductor, the first soft conductor is connected with the moving contact, the first soft conductor is connected with the second soft conductor, one end of the first soft conductor is connected with the bimetallic strip, and the other end of the first soft conductor is connected with the moving contact.
Furthermore, the middle part of the thermal trip rod is circular and is used for being rotationally connected with the partition plate, one end of the thermal trip rod is used as a driving end and is matched with the movable end of the bimetallic strip, and the end part of the driving end is in an obtuse circular shape; the other end of the thermal trip rod is used as an unlocking end, and the end part of the thermal trip rod is bent towards one side and used for triggering the circuit breaker to trip.
Furthermore, the whole partition board is in a right-angled triangle shape, the thermal trip rod is rotatably installed at the upper part of the partition board, one end of the thermal trip rod serving as an unlocking end extends out of the partition board to be matched with the operating mechanism, and the other end of the thermal trip rod serving as a driving end is positioned in the middle of the partition board; the temperature control assembly comprises a bimetallic strip, a current-carrying conductor and a support, the support is used for fixing the current-carrying conductor and the bimetallic strip between a wiring terminal and a moving contact, the moving end of the bimetallic strip extends to the driving end used for driving the thermal trip rod on the partition plate, the support is obliquely arranged along the edge of the oblique edge of the partition plate and is used for being connected with the adjusting piece on one side of the shell, and the adjusting piece is obliquely arranged towards the oblique edge of the partition plate.
Furthermore, the operating mechanism comprises a contact support, a jump buckle and a lock catch which are respectively arranged on the contact support in a pivoting mode, the contact support is connected with the moving contact, one ends of the jump buckle and the lock catch are connected with each other in a buckling mode, the other end of the jump buckle is provided with a connecting rod used for being connected with the handle, and the other end of the lock catch is provided with an unlocking part matched with the thermal tripping rod.
Furthermore, the unlocking part is positioned at the edge of one side of the lock close to the wiring terminal of the wire inlet end, and the unlocking part is of a convex structure which is convexly arranged at the edge of the lock; and the current-carrying conductor is also provided with an arc striking plate for introducing electric arc into the arc extinguishing chamber, and the arc striking plate and the moving contact are positioned on the same plane.
Furthermore, an arc extinguish chamber is arranged in the shell, the arc extinguish chamber is positioned on one side, away from the temperature control assembly, of the moving contact and is positioned below the static contact, and the partition plate is positioned on one side, close to the moving contact, of the arc extinguish chamber.
Compared with the prior art, the miniature circuit breaker does not need to shunt current to the temperature control assembly, only the moving contact and the thermal trip rod are arranged in two different planes by additionally arranging the partition plate in the shell, so that the bimetallic strip which is originally positioned on the same plane with the moving contact is positioned on the two planes with the moving contact under the separation action of the partition plate, and the temperature control assembly is arranged in a space close to the moving contact in a matching way, so that the length of a current-carrying conductor of the temperature control assembly is shortened, the internal resistance is reduced, the heat generation is reduced, and the damage of parts caused by overhigh temperature rise of the temperature control assembly is avoided.
In addition, through set up first critical point, second critical point and spacing portion on the baffle, under the restriction of first critical point, second critical point, make the circuit breaker can not receive the interference of hot trip bar in normal operation process, spacing portion is used for restricting the home range of bimetallic strip, avoids causing the interference to the normal operation of circuit breaker.
Drawings
Fig. 1 to 3 are schematic structural views of a miniature circuit breaker according to the present invention;
FIG. 4 is an exploded schematic view of FIG. 2;
fig. 5 is a schematic structural view of a temperature control assembly in a miniature circuit breaker according to the present invention;
fig. 6 is a schematic view showing a structure of a partition in a miniature circuit breaker according to the present invention;
fig. 7 is a schematic view showing a structure of a current carrying conductor in a small-sized circuit breaker according to the present invention.
Detailed Description
The following describes a detailed embodiment of a miniature circuit breaker according to the present invention with reference to the embodiments shown in fig. 1 to 7. A small-sized circuit breaker of the present invention is not limited to the description of the following embodiments.
A miniature circuit breaker comprises a shell 1 and a handle 2 arranged on the shell 1, wherein an overload protection device and an operating mechanism connected with a moving contact 8 are arranged in the shell 1, the overload protection device comprises a temperature control component with a bimetallic strip 61, a wire inlet terminal connecting terminal connected with the moving contact 8 is arranged at one side, close to the moving contact 8, in the shell 1, a static contact matched with the moving contact 8 is arranged at one side of the moving contact 8, the temperature control component is arranged at the other side of the moving contact 8, the overload protection device also comprises a temperature control protection device, and the temperature control component drives the temperature control protection device arranged in the shell 1 to trigger the circuit breaker to trip in overload; the temperature control protection device comprises a partition plate 41 and a thermal trip rod 42, the thermal trip rod 42 can rotate on the partition plate 41 to trigger the circuit breaker to trip, and the moving contact 8 and the thermal trip rod 42 are separated in two different planes by the partition plate 41; the temperature control assembly comprises a bimetallic strip 61 and a current-carrying conductor, the fixed end of the bimetallic strip 61 is positioned on the shell 1 close to one side of the movable contact 8, the bimetallic strip 61 is connected with a wiring terminal of a wire inlet end through the current-carrying conductor, and when the circuit breaker is overloaded, the bimetallic strip 61 is heated and bent, so that the movable end 611 of the bimetallic strip 61 drives the thermal trip rod 42 to rotate to trigger the circuit breaker to trip and disconnect.
Compared with the prior art, the miniature circuit breaker does not need to shunt current to the temperature control assembly, the operating mechanism, the overload protection device and the moving contact 8 are all positioned in the same cavity of the shell 1, the moving contact 8 and the thermal trip rod 42 are respectively arranged in two different planes by additionally arranging the partition plate 41 in the shell 1, so that the bimetallic strip 61 originally positioned on the same plane with the moving contact 8 is also positioned on the two planes with the moving contact 8 under the separation action of the partition plate 41, and the temperature control assembly is arranged in a space close to the moving contact 8 in a matching manner, so that the length of a current-carrying conductor of the temperature control assembly is shortened, the internal resistance is reduced, the heat is reduced, and the damage of parts caused by overhigh temperature rise of the temperature control assembly is avoided.
An embodiment is provided by combining fig. 1-4, a miniature circuit breaker includes a housing 1 and a handle 2 disposed on the housing 1, an overload protection device and an operating mechanism connected with a movable contact 8 are disposed in the housing 1, the overload protection device includes a temperature control component having a bimetallic strip 61 and a temperature control protection device, the operating mechanism includes a contact support, a trip 31 and a latch 32 pivotally disposed on the contact support respectively, the contact support is connected with the movable contact 8, one ends of the trip 31 and the latch 32 are connected with each other by a snap-fit, the other end of the trip 31 is provided with a connecting rod 33 for connecting with the handle 2, the handle 2 and the operating mechanism are disposed on the upper portion of the housing 1, one side of the movable contact 8 is provided with a static contact matched with the movable contact 8, the static contact is disposed on a static contact plate 9, the other side of the movable contact 8 is provided with the temperature control component, a wire inlet terminal connecting terminal (not shown in the figure) connected with the movable contact 8 is arranged on one side of the shell 1 close to the movable contact 8, a wire outlet terminal connecting terminal (not shown in the figure) is arranged on one side of the shell 1 close to the fixed contact, a temperature control component is arranged on one side of the movable contact 8 close to the wire inlet terminal connecting terminal, the temperature control component drives a temperature control protection device arranged in the shell 1 to trigger an operating mechanism to unlock so as to enable a circuit breaker to be tripped and disconnected, the temperature control protection device comprises a partition plate 41 and a thermal trip rod 42, the thermal trip rod 42 can rotate on the partition plate 41 to trigger the operating mechanism to unlock, the partition plate 41 separates the movable contact 8 and the thermal trip rod 42 into two different planes, preferably, the partition plate 41 is a partition plate 41 which is arranged in the middle of the shell 1 and is in a right-angled triangle shape, the thermal trip rod 42 is rotatably arranged on the upper portion of the partition plate 41, and one end of the thermal trip rod 42 as a tripping end 421 extending out of the partition plate 41 to be matched with the operating mechanism, the other end of the thermal trip bar 42 is located in the middle of the partition plate 41 as a driving end 422; the temperature control assembly comprises a bimetallic strip 61 and a current-carrying conductor, the fixed end of the bimetallic strip 61 is positioned on the shell 1 close to one side of the movable contact 8, the bimetallic strip 61 is connected with a wiring terminal of a wire inlet end through the current-carrying conductor, when the circuit breaker is overloaded, the bimetallic strip 61 is heated and bent, the movable end 611 of the bimetallic strip 61 drives the thermal trip rod 42 to rotate to trigger the operating mechanism to trip and break, and the movable end 611 of the bimetallic strip 61 is positioned above the partition plate 41. In this embodiment, the trip bar 42 is matched with the latch 32 of the operating mechanism, the jump buckle 31 of the operating mechanism is connected with the latch 32 in a snap-in manner, and the thermal trip bar 42 rotates to drive the latch 32 to rotate, so that the snap-in connection between the latch 32 and the jump buckle 31 is released, and the circuit breaker is tripped and disconnected.
It should be noted that the meaning of adding the partition plate 41 in the housing 1 is to fully separate the space near the movable contact 8, increase the space utilization rate thereof, and install the temperature control component in the space near the movable contact 8, and certainly, the space between the movable contact 8 and the wiring terminal of the incoming line terminal is increased by increasing the housing 1, so that the temperature control component can also be installed near the movable contact 8, which is not favorable for the miniaturization design of the circuit breaker.
In addition, the inlet terminal connecting terminal and the outlet terminal connecting terminal can be adjusted to be the outlet terminal connecting terminal and the inlet terminal according to the change of the user wiring mode.
As shown in fig. 5, the temperature control assembly specifically includes a bimetal 61, a current-carrying conductor and a bracket 63, where the bracket 63 is used to fix the current-carrying conductor and the bimetal 61 between a connection terminal at a wire inlet end and the movable contact 8, one end of the bracket 63 is connected to a fixed end of the bimetal 61, the other end of the bracket 63 and the movable end 611 of the bimetal 61 form a branched structure, and the other end of the bracket 63 is used to be connected to the adjusting member 7 disposed on one side of the housing 1, preferably, the bracket 63 is disposed along an oblique edge of the partition plate 41 in an inclined manner and is used to be connected to the adjusting member 7 on one side of the housing 1, and the adjusting member 7 is disposed towards the oblique edge of the partition plate 41, so as to further shorten the length of the bracket 63. A current-carrying conductor structure as shown in fig. 7 is provided, where the current-carrying conductor includes a current-carrying plate 623, a first flexible conductor 621, and a second flexible conductor 622, one end of the current-carrying plate 623 is connected to a connection terminal of a line inlet terminal, the other end of the current-carrying plate 623 is connected to the second flexible conductor 622, the first flexible conductor 621 is connected to a movable contact 8, one end of the first flexible conductor 621 is connected to a bimetal 61, and the other end of the first flexible conductor 621 is connected to the movable contact 8, although the first flexible conductor 621 and the second flexible conductor 622 may be combined into a flexible conductor, and the flexible conductor only needs to connect the current-carrying plate 623, the movable contact 8, and the bimetal 61 together, and the specific form thereof is not limited. The movable end 611 of the bimetal 61 extends to the driving end 422 of the thermal trip bar 42 on the partition plate 41, and further, an arc striking plate 64 for introducing an arc into the arc extinguishing chamber is preferably connected to the current carrying conductor, and the arc striking plate 64 and the movable contact 8 are in the same plane. The adjusting part 7 is a screw.
As shown in fig. 6, the partition plate 41 is provided with a first critical point 411, a second critical point 412 and a limiting portion 413, the first critical point 411 and the second critical point 412 are used for limiting and matching with the thermal trip rod 42, and under the limiting action of the first critical point 411 and the second critical point 412, the thermal trip does not interfere with the operating mechanism under the condition that the circuit breaker normally works; the middle part of the thermal trip rod 42 is rotatably mounted on the partition plate 41, one end of the thermal trip rod 42 serving as an unlocking end 421 passes through a gap between the first critical point 411 and the second critical point 412 to be matched with the operating mechanism, and the other end of the thermal trip rod 42 serving as a driving end 422 is matched with the movable end 611 of the bimetallic strip 61; the limiting portion 413 is used for limiting and matching with the bimetallic strip 61, so that the bimetallic strip 61 is bent in a limited space under the action of the limiting portion 413, and the limiting space of the limiting portion 413 is related to the bending degree of the bimetallic strip 61 during overload.
According to the best scheme provided by fig. 6, the partition plate 41 is in a right-angled triangle shape as a whole, a mandrel for rotatably mounting the thermal trip rod 42 is arranged at the upper part of the partition plate 41, two protrusions are respectively arranged at one side of the mandrel close to the operating mechanism as a first critical point 411 and a second critical point 412, the first critical point 411 is positioned at one side close to the temperature control assembly, and the second critical point 412 is positioned at one side far away from the temperature control assembly; when the circuit breaker is not overloaded, the thermal trip bar 42 is located on the side near the first critical point 411; when the circuit breaker is overloaded, the thermal trip bar 42 is driven by the bimetal 61 to approach the second critical point 412, and the unlocking end 421 of the thermal trip bar 42 trips the operating mechanism, so that the circuit breaker trips and is powered off. A longitudinal convex rib is arranged on the partition plate 41, a groove serving as a limiting part 413 is arranged in the middle of the convex rib, and the movable end 611 of the bimetallic strip 61 penetrates through the groove to be matched with the driving end 422 of the thermal trip rod 42; when the overload of the circuit breaker does not occur, the movable end 611 of the bimetal 61 approaches the lower side wall of the groove, and when the overload of the circuit breaker occurs, the movable end 611 of the bimetal 61 approaches the upper side wall of the groove to drive the thermal trip bar 42 to rotate. The right-angle side of the partition plate 41 close to one side of the arc extinguish chamber is provided with a comb-shaped groove used for being matched with an arc extinguish grating sheet of the arc extinguish chamber to adjust the air pressure of the arc extinguish chamber, a groove used for matching and installing a static contact is arranged above the comb-shaped groove, and the groove is circular.
The arc extinguishing chamber is located on one side, far away from the temperature control component, of the moving contact 8 and located below the fixed contact, the moving contact 8 swings to enable the moving contact at one end to be in contact with or separated from the fixed contact on the fixed contact, the fixed contact extends to the arc entering side of the arc extinguishing chamber, the partition plate 41 is located on one side, close to the moving contact 8, of the arc extinguishing chamber and corresponds to the swing space of the moving contact 8, only the swing space of the moving contact 8 is isolated, the moving contact 8, the thermal trip rod 42 and the movable end 611 of the bimetallic strip 61 are separated on different planes, the space of the arc extinguishing chamber is not occupied, and the arc extinguishing capacity is not affected.
The thermal trip bar 42 mounted on the partition plate 41 is preferably as shown in fig. 2 to 4, the thermal trip bar 42 is a rod body with one thick end and one thin end, the middle part of the thermal trip bar 42 is circular and is used for being rotatably connected with the partition plate 41, the thin end of the thermal trip bar 42 is used as a driving end 422 for being matched with a movable end 611 of the bimetallic strip 61, and the end part of the driving end 422 is in an obtuse circular shape; the thicker end of the thermal trip bar 42 is used as an unlocking end 421, and the end of the thermal trip bar is bent to one side for triggering the operating mechanism to trip.
Preferably, an unlocking portion 321 matched with the unlocking end 421 of the thermal trip bar 42 is arranged at one end of the latch 32 of the operating mechanism, the unlocking portion 321 is located at an edge of one side of the latch 32 close to the wire inlet end connecting terminal, the unlocking portion 321 is a protruding structure convexly arranged on the edge of the latch 32, and the unlocking end 421 of the thermal trip bar 42 is located at the side opposite to the unlocking portion 321.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention relates, several simple deductions or substitutions may be made without departing from the spirit of the invention, which should be construed as falling within the scope of the invention.
Claims (10)
1. The utility model provides a miniature circuit breaker, includes casing (1) and handle (2) of setting on casing (1), is equipped with overload protection device and the operating device who is connected with moving contact (8) in casing (1), overload protection device is equipped with the inlet wire end binding post of being connected with moving contact (8) including the temperature control component who has bimetallic strip (61) near one side of moving contact (8) in casing (1), be equipped with in one side of moving contact (8) with moving contact (8) complex static contact, be equipped with at the opposite side of moving contact (8) temperature control component, its characterized in that:
the overload protection device also comprises a temperature control protection device, and the temperature control component drives the temperature control protection device arranged in the shell (1) to trigger the circuit breaker to trip when the overload occurs;
the temperature control protection device comprises a partition plate (41) and a thermal tripping rod (42), the thermal tripping rod (42) can rotate on the partition plate (41) to trigger the circuit breaker to trip, and the moving contact (8) and the thermal tripping rod (42) are separated in two different planes by the partition plate (41); the temperature control assembly comprises a bimetallic strip (61) and a current-carrying conductor, wherein the fixed end of the bimetallic strip (61) is positioned on the shell (1) close to one side of the movable contact (8), the bimetallic strip (61) is connected with a wiring terminal of a wire inlet end through the current-carrying conductor, and when the circuit breaker is overloaded, the bimetallic strip (61) is heated and bent, so that the movable end (611) of the bimetallic strip (61) drives the thermal trip rod (42) to rotate to trigger the circuit breaker to trip and break.
2. A miniature circuit breaker according to claim 1, wherein: the temperature control assembly further comprises a support (63) for fixedly mounting the bimetallic strip (61) and the current-carrying conductor, one end of the support (63) is connected with the fixed end of the bimetallic strip (61), the other end of the support (63) and the movable end (611) of the bimetallic strip (61) form a branched structure, and the other end of the support (63) is used for being connected with an adjusting piece (7) arranged on one side of the shell (1).
3. A miniature circuit breaker according to claim 1, wherein: the thermal trip device is characterized in that a first critical point (411), a second critical point (412) and a limiting part (413) are arranged on the partition plate (41), the first critical point (411) and the second critical point (412) are used for being in limiting fit with the thermal trip rod (42), the middle part of the thermal trip rod (42) is rotatably installed on the partition plate (41), one end of the thermal trip rod (42) is used as a trip end (421) to penetrate through a gap between the first critical point (411) and the second critical point (412) to be matched with the operating mechanism, and the other end of the thermal trip rod (42) is used as a driving end (422) to be matched with a movable end (611) of the bimetallic strip (61); the limiting part (413) is used for limiting and matching with the bimetallic strip (61).
4. A miniature circuit breaker according to claim 3, wherein: the whole partition plate (41) is in a right-angled triangle shape, a mandrel used for rotatably mounting the thermal trip rod (42) is arranged at the upper part of the partition plate (41), two bulges are respectively arranged at one side of the mandrel close to the operating mechanism to serve as a first critical point (411) and a second critical point (412), the first critical point (411) is positioned at one side close to the temperature control assembly, and the second critical point (412) is positioned at one side far away from the temperature control assembly; a longitudinal convex rib is arranged on the partition plate (41), a groove serving as a limiting part (413) is arranged in the middle of the convex rib, and a movable end (611) of the bimetallic strip (61) penetrates through the groove to be matched with a driving end (422) of the thermal trip rod (42).
5. A miniature circuit breaker according to claim 1, wherein: the current-carrying conductor comprises a current-carrying plate (623), a first soft conductor (621) and a second soft conductor (622), one end of the current-carrying plate (623) is connected with a wiring terminal, the other end of the current-carrying plate (623) is connected with the second soft conductor (622), the first soft conductor (621) is connected with the moving contact (8), the first soft conductor (621) is connected with the second soft conductor (622), one end of the first soft conductor (621) is connected with the bimetallic strip (61), and the other end of the first soft conductor (621) is connected with the moving contact (8).
6. A miniature circuit breaker according to claim 1, wherein: the middle part of the thermal trip rod (42) is circular and is used for being rotationally connected with the partition plate (41), one end of the thermal trip rod (42) serves as a driving end (422) and is used for being matched with a movable end (611) of the bimetallic strip (61), and the end part of the driving end (422) is in an obtuse circular shape; the other end of the thermal trip rod (42) is used as an unlocking end (421), and the end part of the thermal trip rod is bent towards one side and used for triggering the circuit breaker to trip.
7. A miniature circuit breaker according to claim 1, wherein: the whole partition plate (41) is in a right-angled triangle shape, the thermal trip rod (42) is rotatably installed at the upper part of the partition plate (41), one end of the thermal trip rod (42) is used as an unlocking end (421) and extends out of the partition plate (41) to be matched with the operating mechanism, and the other end of the thermal trip rod (42) is used as a driving end (422) and is positioned in the middle of the partition plate (41); temperature control assembly includes bimetallic strip (61), current-carrying conductor and support (63), support (63) are used for being fixed in between inlet wire end binding post and moving contact (8) current-carrying conductor and bimetallic strip (61), the expansion end (611) of bimetallic strip (61) extend to and are used for driving drive end (422) of hot trip rod (42) on baffle (41), support (63) set up along the hypotenuse edge slope of baffle (41) and are used for being connected with regulating part (7) of casing (1) one side, regulating part (7) slope sets up towards the hypotenuse of baffle (41).
8. A miniature circuit breaker according to claim 1, wherein: the operating mechanism comprises a contact support, a jump buckle (31) and a lock catch (32) which are respectively arranged on the contact support in a pivoting mode, the contact support is connected with the moving contact (8), one ends of the jump buckle (31) and the lock catch (32) are connected in a buckling mode, the other end of the jump buckle (31) is provided with a connecting rod (33) used for being connected with the handle (2), and the other end of the lock catch (32) is provided with an unlocking portion (321) matched with the thermal trip rod (42).
9. A miniature circuit breaker according to claim 8, wherein: the unlocking part (321) is positioned at the edge of one side of the lock catch (32) close to the wiring terminal of the wire inlet end, and the unlocking part (321) is of a convex structure which is convexly arranged at the edge of the lock catch (32); and an arc striking plate (64) for introducing electric arc into the arc extinguishing chamber is further arranged on the current-carrying conductor, and the arc striking plate (64) and the movable contact (8) are positioned on the same plane.
10. A miniature circuit breaker according to claim 1, wherein: an arc extinguish chamber is arranged in the shell (1), the arc extinguish chamber is positioned on one side, away from the temperature control component, of the moving contact (8) and below the fixed contact, and the partition plate (41) is positioned on one side, close to the moving contact (8), of the arc extinguish chamber.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010152847.7A CN113363120A (en) | 2020-03-06 | 2020-03-06 | Small-sized circuit breaker |
| AU2021229961A AU2021229961B2 (en) | 2020-03-06 | 2021-02-12 | Miniature circuit breaker |
| EP21765252.8A EP4117010A4 (en) | 2020-03-06 | 2021-02-12 | Miniature circuit breaker |
| PCT/CN2021/076633 WO2021175113A1 (en) | 2020-03-06 | 2021-02-12 | Miniature circuit breaker |
| ZA2022/08519A ZA202208519B (en) | 2020-03-06 | 2022-07-29 | Miniature circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010152847.7A CN113363120A (en) | 2020-03-06 | 2020-03-06 | Small-sized circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113363120A true CN113363120A (en) | 2021-09-07 |
Family
ID=77524130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010152847.7A Pending CN113363120A (en) | 2020-03-06 | 2020-03-06 | Small-sized circuit breaker |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP4117010A4 (en) |
| CN (1) | CN113363120A (en) |
| AU (1) | AU2021229961B2 (en) |
| WO (1) | WO2021175113A1 (en) |
| ZA (1) | ZA202208519B (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5258465U (en) * | 1975-10-24 | 1977-04-27 | ||
| US4419649A (en) * | 1981-11-04 | 1983-12-06 | Westinghouse Electric Corp. | Circuit breaker for use on AC and DC circuits |
| CN201015109Y (en) * | 2007-02-15 | 2008-01-30 | 黄华道 | Small circuit breaker |
| KR20150118460A (en) * | 2014-04-14 | 2015-10-22 | 엘에스산전 주식회사 | Home Circuit Breaker |
| CN107993897A (en) * | 2017-12-12 | 2018-05-04 | 上海电科电器科技有限公司 | Earth leakage circuit breaker |
| CN109727826A (en) * | 2018-12-28 | 2019-05-07 | 浙江正泰电器股份有限公司 | Miniature circuit breaker |
| CN209981142U (en) * | 2019-02-15 | 2020-01-21 | 浙江正泰电器股份有限公司 | Circuit breaker |
| CN211828666U (en) * | 2020-03-06 | 2020-10-30 | 浙江正泰电器股份有限公司 | Small-sized circuit breaker |
-
2020
- 2020-03-06 CN CN202010152847.7A patent/CN113363120A/en active Pending
-
2021
- 2021-02-12 AU AU2021229961A patent/AU2021229961B2/en active Active
- 2021-02-12 WO PCT/CN2021/076633 patent/WO2021175113A1/en active Application Filing
- 2021-02-12 EP EP21765252.8A patent/EP4117010A4/en active Pending
-
2022
- 2022-07-29 ZA ZA2022/08519A patent/ZA202208519B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ZA202208519B (en) | 2023-03-29 |
| EP4117010A1 (en) | 2023-01-11 |
| AU2021229961A1 (en) | 2022-08-25 |
| AU2021229961B2 (en) | 2023-08-17 |
| WO2021175113A1 (en) | 2021-09-10 |
| EP4117010A4 (en) | 2024-04-10 |
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