CN217061985U - Operating mechanism of miniature circuit breaker - Google Patents

Abstract

The operating mechanism of the miniature circuit breaker comprises at least one lever and two contact supports which are rotatably assembled on the lever, wherein each contact support is connected with a moving contact, the two moving contacts are electrically connected through a flexible coupling, each contact support is also rotatably assembled with a torsion spring, and two ends of the torsion spring are respectively abutted against the contact supports and the lever to be matched with the contact supports to provide contact pressure for the moving contacts. The utility model discloses a miniature circuit breaker, two adjacent action units's moving contact passes through the flexible coupling electricity and connects, provides contact pressure for the moving contact by torsional spring and contact support, lever cooperation for certain contact pressure and reliable contact still can be guaranteed to two adjacent action units's contact mechanism under the inconsistent circumstances of wearing and tearing.

Description

Operating mechanism of miniature circuit breaker

Technical Field

The utility model relates to a low voltage distribution system, concretely relates to miniature circuit breaker's operating device.

Background

In a low-voltage distribution system, a circuit breaker is widely used as a switching device for protecting power supply safety. The circuit breaker generally comprises a contact system, an arc extinguishing system, an operating mechanism and an overcurrent protection device, wherein under the normal working condition, the operating mechanism enables the contact system to keep closed or open through a transmission mechanism such as a lever and the like so as to switch on and switch off a power line, when an overcurrent fault occurs, the overcurrent protection device acts to enable the operating mechanism to trip and rapidly switch off the overcurrent, wherein the good or bad design of the arc extinguishing system is particularly important for the circuit breaker to break short-circuit current.

In the existing miniature circuit breaker, a pair of rigidly connected parallel moving contact structures is arranged, so that the arc voltage during breaking can be greatly improved, and the arc extinguishing time is shortened, but as the breaking times are increased, two pairs of moving and static contacts are inevitably worn, so that the contact parameters (opening distance, overtravel and contact pressure) of the two pairs of moving and static contacts are inconsistent, the temperature rise of the circuit breaker is extremely high, and the fire hazard is caused.

Disclosure of Invention

An object of the utility model is to overcome prior art's defect, provide a simple structure, high miniature circuit breaker's of reliability operating device.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides an operating device of miniature circuit breaker, includes that at least one lever and two contacts of rotation assembly on the lever support, are connected with a moving contact on every contact support, and two moving contacts are connected through the flexible coupling electricity, still rotate on every contact support and are equipped with a torsional spring, the both ends of torsional spring support with the contact respectively, the lever supports to lean on the cooperation to be used for providing contact pressure for the moving contact.

Furthermore, at least one side of the lever is rotatably provided with a jump buckle and a lock catch, the jump buckle is in hasp fit with one end of the lock catch, and the other end of the lock catch is connected with a tripping hook.

Furthermore, two convex shafts are convexly arranged on the lever, and the jump buckle and the lock catch are respectively and rotatably assembled on the two convex shafts.

Further, two contact supports are respectively installed at both sides of the lever, the latch is rotatably assembled at one side of the lever, and one end of the latch is located between the two contact supports.

Furthermore, one end of the jump buckle is connected with a connecting rod, and the operating mechanism is connected with a handle mechanism of the circuit breaker in a linkage mode through the connecting rod.

Further, still rotate on the hasp and be connected with the piece that resets, the one end and the hasp of the piece that resets are connected, the other end that resets be equipped with shell inside wall complex wave elastic arm.

Further, the center of torsional spring is fixed in the center of rotation that the contact supported, and the one end of torsional spring supports with the boss that sets up on the contact supports to lean on the cooperation, and the other end of torsional spring supports with the boss that sets up on the lever and leans on the cooperation.

Furthermore, a mechanism main spring for providing switching-on resistance or switching-off reset force is arranged in the shell, and two ends of the mechanism main spring are respectively connected with the lever and the shell.

Furthermore, two fixed contacts are arranged on the opposite sides of the two moving contacts, and the two fixed contacts are respectively matched with the two moving contacts.

Furthermore, two convex shafts are convexly arranged on one side of the lever, a jump buckle and a lock catch are respectively and rotatably assembled on the two convex shafts, the jump buckle is in hasp fit with the lock catch, the other end of the lock catch is connected with a tripping hook, the lock catch is in linkage connection with the lever, a reset piece for providing reset force for the lock catch is also connected to the lock catch, and the reset piece and the jump buckle are positioned on two sides of the lock catch; a mechanism main spring is connected between the lever and the shell.

The utility model discloses an operating device of miniature circuit breaker, the moving contact of two adjacent action units passes through the flexible coupling electricity and connects, provides contact pressure for the moving contact by torsional spring and contact support, lever cooperation for certain contact pressure and reliable contact still can be guaranteed to two adjacent action units's contact mechanism under the inconsistent condition of wearing and tearing.

Drawings

FIG. 1 is a schematic view of the present invention;

fig. 2 is a schematic structural diagram of the operating mechanism, the electromagnetic trip mechanism, and the thermal trip mechanism of the present invention;

fig. 3 is a schematic structural view (front side) of the middle arc extinguishing system and the middle cover of the present invention;

fig. 4 is a schematic structural view (reverse side) of the middle arc extinguishing system and the middle cover of the present invention;

fig. 5 is a schematic structural view (front side) of the middle cover of the present invention;

FIG. 6 is a schematic structural view (reverse side) of the middle cover of the present invention;

FIG. 7 is a schematic structural view of the housing and the insulating partition plate according to the present invention;

FIG. 8 is a schematic structural view of an insulating spacer according to the present invention;

fig. 9 is a schematic view of the insulating barrier connection of a plurality of circuit breakers of the present invention;

fig. 10 is a schematic structural diagram of an operating mechanism according to the present invention;

fig. 11 is a schematic structural diagram of the operating mechanism of the present invention (without a jump button);

fig. 12 is a schematic circuit diagram of the contact mechanism of 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 12. The present invention is not limited to the description of the following embodiments.

As shown in fig. 1, a miniature circuit breaker includes a housing 1, which generally includes a base 11 and an upper cover 12 that are covered with each other, a pair of terminals 2 and a pair of connection ports 105 are respectively provided at both ends of the housing 1, and the terminals 2 respectively correspond to the connection ports 105. The miniature circuit breaker is a single-pole circuit breaker suitable for a high-voltage environment, at least two action units are arranged between a pair of wiring terminals 2 in parallel along the width direction of the circuit breaker, the at least two action units share one operating mechanism 4, each action unit comprises a contact mechanism and an arc extinguishing system 6, the contact mechanism comprises a moving contact 51 and a fixed contact 52 which are matched with each other, wherein the fixed contact 52 is fixedly assembled in the middle of a shell 1, the moving contact 51 is connected on the operating mechanism 4 and is opposite to the fixed contact 52, the moving contacts 51 of the two action units are electrically connected, the fixed contact 52 of one action unit is electrically connected with one wiring terminal 2, the fixed contact 52 of the other action unit is electrically connected with the other wiring terminal 2, the moving contact and the fixed contact of the two action units are used for improving the arc voltage during short-circuit breaking, the operating mechanism 4 is in linkage connection with a handle mechanism 3 which is rotatably assembled on the shell 1, the swing handle mechanism 3 drives the operating mechanism 4 to drive the contact mechanisms of the action units to perform opening and closing actions, and the arc extinguishing system 6 is arranged on one side of the contact mechanisms in a matched mode and used for extinguishing electric arcs generated when the contact mechanisms are broken.

A protection mechanism can be further arranged in the housing 1, the protection mechanism is matched with the operating mechanism 4 to realize short circuit and/or overload protection, the protection mechanism comprises an electromagnetic tripping mechanism 7 and/or a thermal tripping mechanism 8, and only one electromagnetic tripping mechanism 7 and/or one thermal tripping mechanism 8 can be respectively arranged.

One improvement point of the present application is that the moving contacts 51 of two adjacent action units are electrically connected in a flexible connection manner, so that the contact mechanisms of two adjacent action units can still ensure a certain contact pressure and reliable contact under the condition of inconsistent wear.

Specifically, as shown in fig. 2, 10 and 11, the actuating unit disposed in the housing 1 includes at least one lever 41 rotatably assembled, the contact mechanisms of two adjacent actuating units are connected to the same lever 41, each contact mechanism includes a contact support 43 and a torsion spring 46, the contact support 43 is rotatably connected to the lever 41, the torsion spring 46 is rotatably assembled on the contact support 43, two ends of the torsion spring 46 are respectively abutted against the lever 41 and the contact support 43 for providing contact pressure for the movable contact 51, that is, the two torsion springs 46 respectively provide torque for the two movable contacts 51, so as to generate final pressure to the stationary contact 52, the movable contact 51 of each actuating unit is respectively connected to one contact support 43, the two adjacent movable contacts 51 are electrically connected through a flexible coupling 511, compared with an integrated structure in which the two movable contacts 51 are rigidly connected in the existing structure, the rotation angles of the two movable contacts 51 during simultaneous actuation are necessarily the same, when the wear degrees of the moving contacts 51 or the fixed contacts 52 are inconsistent, the two adjacent moving contacts 511 are flexibly connected through the torsion spring 46 and the flexible connection 511, even if the two moving contacts 511 are worn inconsistently, a certain contact pressure and reliable contact can still be ensured, namely, after the pair of moving contacts 51 and the fixed contacts 52 in one of the action units are contacted, the pair of moving contacts 51 and the fixed contacts 52 in the other action unit can be contacted again through the torsion spring 46 of the other action unit and provide final pressure.

Further, the operating mechanism 4 further includes a jump buckle 44 and a lock buckle 45 rotatably assembled on the lever 41, the jump buckle 44 is in snap-fit with one end of the lock buckle 45, and the other end of the lock buckle 45 is in fit with the electromagnetic trip mechanism 7 and/or the thermal trip mechanism 8 to achieve protection. Preferably, the lock catch 45 is in linkage connection with the lever 41 through a linkage shaft, so that the action consistency of the adjacent two-pole circuit breaker operating mechanism during tripping is guaranteed, the reset piece 48 is connected to the lock catch 45, and the reset piece 48 is matched with the shell 1 to provide reset force for the lock catch 45.

Another improvement point of the present application is that at least one middle cover 13 is disposed in the housing 1, the middle cover 13 is used for separating the arc extinguishing system 6 and the contact mechanism of each action unit, and the middle cover 13 provides an assembly position for the fixed contact 52 in the arc extinguishing system 6 and the contact mechanism, a blocking portion 132 is further disposed at one end of the middle cover 13, when the thermal trip mechanism 8 is disposed in the housing 1, the moving contact 51 and the thermal trip mechanism 8 are separated by the blocking portion 132, so that the thermal trip mechanism 8 is prevented from being ablated by the arc generated when the contact mechanism is disconnected.

Specifically, as shown in fig. 3 to 6, mounting grooves 131 are formed on the front and back sides of the middle cover 13, preferably, the same position on the front and back sides of the middle cover 13 is recessed to form opposite mounting grooves 131, an arc extinguishing chamber fixing portion and a limiting portion 1312 are respectively disposed in the mounting grooves 131, a static contact 52 of the contact mechanism is fixedly mounted in the middle of the mounting groove 131, wherein the arc extinguishing chamber fixing portion is preferably a plurality of strip-shaped raised fixing ribs 1311 disposed in parallel and at intervals, a plurality of arc extinguishing grid plates are stacked in the arc extinguishing chamber 61 of the arc extinguishing system 6, the arc extinguishing grid plates are fixed on the middle cover 13 by being matched with the fixing ribs 1311, the limiting portion 1312 and the fixing ribs 1311 are respectively disposed on the two sides of the static contact 52, preferably, the limiting portion 1312 and the static contact 52 are inclined and opposite to limit the arc guiding angle 62 in the arc extinguishing system 6, and a blocking portion 132 opposite to the static contact 52 is formed by extending outward from the edge of the mounting groove 131 far from one end of the fixing rib 1311, when the moving contact 51 swings between the stopper 132 and the fixed contact 52 and the thermal trip mechanism 8 is provided on the operating mechanism 4 side of each operating unit, the stopper 132 located between the moving contact 51 and the thermal trip mechanism 8 prevents the thermal trip mechanism 8 from being ablated by an arc generated by the contact mechanism breaking.

The application has a further improvement point that at least one end of the shell 1 is detachably provided with an insulating partition 14 (see fig. 7-9), the insulating partition 14 is fixed with the shell 1 through a clamping structure in a clamping mode, the insulating partition 14 comprises a connecting plate 141 and two partition plates 142, a threading opening 1412 corresponding to the wiring opening 105 is formed in the connecting plate 141 so as to facilitate external threading, the two partition plates 142 are arranged on two sides of the threading opening 1412 at intervals and used for isolating the wiring terminals 2 at the same end of two adjacent circuit breakers, a knocking-off structure is arranged on at least one partition plate 142, and the two adjacent insulating partitions 14 are communicated through breaking the knocking-off structure arranged on the partition plates 142. In this embodiment, the two isolation boards 142 are vertically connected to the connection board 141, and when two or more than two small circuit breakers are connected in series, the isolation boards 142 isolate the connection terminals 2 at the same end of two adjacent circuit breakers, so as to increase the creepage distance between the two adjacent connection terminals 2. When two poles of the earth circuit breakers need to be connected in series, the two insulation partition plates 142 are communicated through the knock-off structure arranged on the partition plates 142 in a breaking manner, so that the length of a wire when two adjacent circuit breakers are connected in series is shortened, the product cost is reduced, and the safety is improved. Of course, the insulating partition 14 is applicable not only to the embodiment having a plurality of action units, but also to the embodiment having only a single action unit, i.e., one movable contact and one fixed contact.

Preferably, two ends of the housing 1 are respectively provided with a connecting bar connecting port corresponding to the connecting terminal 2 for installing the connecting bar to be electrically connected with the connecting terminal, the connecting bar connecting port is located above the connecting port 105, the knock-out structure corresponds to the connecting bar connecting port, and the knock-out structure arranged on the isolation plate 142 is broken to connect the connecting bar connecting ports of the miniature circuit breakers of two adjacent poles. Preferably, the length of the isolation plate 142 is greater than that of the connection plate 141, the connection plate 141 does not shield the connection row connection port, and the knock-out structure on the isolation plate 142 corresponds to the connection row connection port to isolate the connection row connection port of the adjacent circuit breaker. Of course, the connection plate 141 may be provided with a coupling line hole corresponding to the coupling line connection port.

Preferably, the knock-off structure is a breaking groove 1422 formed in the end portion, close to one end, of the isolation plate 142, the breaking groove 1422 is broken to shorten the length of the isolation plate 142, so that the upper portions of the two adjacent insulation partition plates 14 are communicated, and connection between the two circuit breakers by using a connecting bar is facilitated, so that an overlong wire is replaced, the cost is reduced, in addition, the breaking groove 1422 is convenient to process, the length of the isolation plate 142 can be shortened quickly and conveniently, and the two adjacent insulation partition plates 14 are communicated quickly.

Further, the clamping structure disposed between the insulating partition 14 and the housing 1 includes a first clamping portion 1411, a first clamping groove 102, a second clamping portion 1421, and a second clamping groove 103, wherein the first clamping portion 1411 and the first clamping groove 102 are disposed on the connecting plate 141 and the housing 1 in a matching manner, the second clamping portion 1421 and the second clamping groove 103 are disposed on the isolating plate 142 and the housing 1 in a matching manner, preferably, a terminal of the second clamping groove 103 bends to one side to form a clamping area 104, a terminal of the second clamping portion 1421 bends to one side to form a clamping portion 1423 matched with the clamping area 104, and the second clamping portion 1421 and the second clamping groove 103 adopt an asymmetric structure to provide a guiding effect, thereby enhancing the clamping stability.

With reference to fig. 1 to 9, a specific embodiment of a miniature circuit breaker is provided, where the miniature circuit breaker includes a housing 1 formed by covering an upper cover 12 and a base 11, a handle mechanism 3 is rotatably assembled on an upper portion of the housing 1, a pair of connection terminals 2 are disposed at two ends of the housing 1 and correspond to connection ports 105 disposed at two ends of the housing 1, one of the connection terminals 2 is an incoming terminal, in this embodiment, the connection terminal 2 at the right end of the housing 1 is an incoming terminal, and the other connection terminal 2 is an outgoing terminal, in this embodiment, the connection terminal 2 at the left end of the housing 1 is an outgoing terminal; the middle part of the shell 1 between the incoming line terminal and the outgoing line terminal is provided with two action units in parallel, the two action units share one operating mechanism 4, each action unit comprises an arc extinguishing system 6 and a contact mechanism, wherein the operating mechanism 4 is in linkage connection with the handle mechanism 3 through a connecting rod, the contact mechanisms respectively comprise a moving contact 51 and a fixed contact 52 which are matched with each other, the moving contact 51 is correspondingly connected to the operating mechanism 4, the fixed contact 52 and the arc extinguishing system 6 are fixedly assembled on one side opposite to the moving contact 51 of each action unit and are positioned below the handle mechanism 3, the moving contacts 51 of the two action units are in flexible connection, and when the wear degrees of the contact mechanisms of the two action units are inconsistent, certain contact pressure and reliable contact can be still ensured.

As shown in fig. 1-2, in the present embodiment, a thermal trip mechanism 8 and an electromagnetic trip mechanism 7 are disposed in a housing 1, the thermal trip mechanism 8 and the electromagnetic trip mechanism 7 are respectively disposed at two sides of an operating mechanism 4, wherein the thermal trip mechanism 8 is disposed in the housing 1 between a moving contact 51 and a wire inlet terminal, a stationary contact 52 of one of the moving units is electrically connected to the wire inlet terminal through the thermal trip mechanism 8, the electromagnetic trip mechanism 7 is disposed between the stationary contact 52 and a wire outlet terminal, the electromagnetic trip mechanism 7 is disposed between an arc extinguishing system 6 and a handle mechanism 3 of all the moving units, a stationary contact 52 of the other moving unit is electrically connected to the wire outlet terminal through the electromagnetic trip mechanism 7, two adjacent moving contacts 51 are electrically connected through a soft link 511, and a current of the circuit breaker sequentially passes through the wire inlet terminal, the thermal trip mechanism 8, and a contact mechanism of one of the moving units, The contact mechanism of the other action unit, the electromagnetic tripping mechanism 7 and the outlet terminal.

As shown in fig. 2, 10 and 11, the operating mechanism 4 includes a lever 41, a latch 45, a jumper 44, a trip hook 47, and a mechanism main spring 42, and the contact mechanisms each include a contact support 43 and a torsion spring 46; wherein the lever 41 is rotatably assembled in the housing 1, the two contact supports 43 are respectively rotatably assembled on the front side and the back side of the lever 41, the jump buckle 44 and the lock catch 45 are rotatably assembled on the lever 41, specifically, two convex shafts for respectively rotatably assembling the jump buckle 44 and the lock catch 45 are arranged on one side of the lever 41, the jump buckle 44 is in snap fit with one end of the lock catch 45, one end of the jump buckle 44 is connected with a connecting rod connected with the handle mechanism 3, the trip hook 47 is connected with the other end of the lock catch 45, the trip hook 47 is matched with the movable end of the thermal trip mechanism 8, when a short circuit fault occurs, the push rod opposite to the lock catch 45 by the electromagnetic trip mechanism 7 triggers the lock catch 45 to rotate, so that the snap structures of the jump buckle 44 and the lock catch 45 are collapsed, or, when an overload fault occurs, the thermal trip mechanism 8 triggers the trip hook 47, the lock catch 45 rotates, so that the snap structures of the jump buckle 44 and the lock catch 45 are collapsed, the lock catch 45 is in linkage connection with the lever 41 through a linkage shaft, so that the action consistency of the circuit breaker operating mechanisms of the two adjacent poles is guaranteed when tripping is conducted, one end, matched with the electromagnetic tripping mechanism 7 and the thermal tripping mechanism 8, of the lock catch 45 is located between the two contact supports 43, the lock catch 45 is further connected with a resetting piece 48, the resetting piece 48 and the jump buckle 44 are located on the front side and the back side of the lock catch 45 respectively, one end of the resetting piece 48 is connected with the lock catch 45, the other end of the resetting piece 48 is provided with a wavy elastic arm, and the wavy elastic arm is matched with and extruded with the inner side wall of the shell 1 so as to provide elastic resetting force for the lock catch 45; the torsion spring 46 is rotatably assembled on the contact support 43, that is, the center of the torsion spring 46 is fixed to the rotation center of the contact support 43, one end of the torsion spring 46 is in abutting fit with a boss arranged on the contact support 43, and the other end of the torsion spring 46 is in abutting fit with a boss arranged on the lever 41, so that two ends of the torsion spring 46 respectively abut against the contact support 43 and the lever 41 to provide contact pressure for the movable contact 51, and the mechanism main spring 42 is connected between the lever 41 and the housing 1 and used for providing closing resistance or resetting force for the contact mechanism during opening.

As shown in fig. 1-4 and 12, the contact mechanism includes a moving contact 51 and a static contact 52 that are mutually engaged, in this embodiment, the contact mechanism forms two breakpoints in series, that is, the contact mechanism includes two pairs of moving contacts 51 and static contacts 52 that are connected in series, wherein one end of each of the two moving contacts 51 that are arranged in parallel is connected to the contact support 43 in each action unit, the two moving contacts 51 are electrically connected through a flexible connection 511, the two static contacts 52 that are arranged in parallel are respectively engaged with the two moving contacts 51 that are arranged in parallel, one of the static contacts 52 is connected to one of the connection terminals 2 through the thermal trip mechanism 8, the other static contact 52 is connected to the other connection terminal 2 through the electromagnetic trip mechanism 7, preferably, the static contact 52 that is close to one side of the base 11 is connected to the thermal trip mechanism 8, and the connection terminal 2 that is connected to the thermal trip mechanism 8 is used as a line inlet terminal, the static contact 52 near one side of the upper cover 12 is connected with the electromagnetic tripping mechanism 7, the wiring terminal 2 connected with the electromagnetic tripping mechanism 7 is an outlet terminal, the static contact 52 includes a static contact plate, the static contact plate is disposed along a gap between the arc extinguishing system 6 and the electromagnetic tripping mechanism 7, that is, the static contact plate is disposed along an upper side of the arc extinguishing chamber 61 parallel to the arc extinguishing system 6 in fig. 1, 3 and 4, the other end of the static contact plate is bent back along a static contact mounting portion 1313 in the housing 1 to form an arc guiding portion 521, a static contact matched with the moving contact 51 is arranged on one side of the static contact plate facing the moving contact 51, a connecting part 522 is formed by extending outwards from one side edge of the middle part of the static contact plate, in fig. 4, the connecting portion 522 extends outward from the middle edge of the arc striking portion 521 on the side away from the middle cover 13, i.e., on the side close to the side wall of the housing 1, to the side of the movable contact 51, and the connecting portion 522 is electrically connected to the thermal trip mechanism 8.

As shown in fig. 1, 3 and 4, the arc extinguishing system 6 of each action unit includes an arc extinguishing chamber 61, an arc striking angle 62, an arc blocking wall 63 and a permanent magnet 64, wherein the arc extinguishing chamber 61 is fixed in the installation groove 131, a plurality of arc extinguishing grid pieces are arranged in the arc extinguishing chamber 61 in a stacked manner, the fixed contact 52 is located on one side of the arc extinguishing chamber 61, the movable contact 51 is opposite to the fixed contact 52, the arc striking angle 62 is obliquely opposite to the fixed contact 52, one end of the arc striking angle 62 is located below the movable contact 51, and the other end of the arc striking angle 62 extends into the arc extinguishing chamber 61; the permanent magnets 64 are arranged on one side, back to the arc extinguishing chamber 61, of the arc striking angle 62, and the polarities of the permanent magnets 64 of the two arc extinguishing systems 6 are consistent along the width of the shell 1, so that the generated magnetic field can always ensure that electric arcs between contact mechanisms in one action unit enter the arc extinguishing chamber 61 to extinguish the arc; the arc isolating wall 63 made of gas generating material is arranged between the arc extinguishing chamber 61 and the arc striking angle 62, the middle part of the arc isolating wall 63 is provided with a groove structure, the arc striking angle 62 is opposite to the arc striking part 521 of the static contact 52, an arc striking channel is formed on the arc isolating wall 63, after the contact mechanism acts to generate an arc, the arc isolating wall 63 generates gas, so that the local pressure is increased, the arc blowing effect is realized, the arc is elongated, the arc voltage is increased, and the arc extinguishing is facilitated. The permanent magnet 64 may or may not be positioned depending on the performance requirements of the circuit breaker.

The thermal tripping mechanism 8 comprises a bimetallic strip, one end of the bimetallic strip is fixedly connected in the shell 1, the other end of the bimetallic strip is used as a movable end to be matched with the operating mechanism 4, and when an overload fault occurs, the bimetallic strip is heated and bent to trigger the operating mechanism 4 to act. The electromagnetic tripping mechanism 7 comprises a coil and a push rod driven by the coil, the push rod is opposite to the lock catch 45 on the operating mechanism 4, and when a short-circuit fault occurs, the push rod acts to trigger the operating mechanism 4 to act.

As shown in fig. 1 and 3-6, an intermediate cover 13 is further disposed in the housing 1, the intermediate cover 13 is used for separating an arc extinguishing system and a contact mechanism of two adjacent action units, the arc extinguishing system 6 and a static contact 52 of the two action units are respectively fixed on the front side and the back side of the base 1 and/or the intermediate cover 13, one end of the intermediate cover 13 is provided with a blocking portion 132, the movable contact 51 swings between the blocking portion 132 and the static contact 52, the blocking portion 132 separates the movable contact 51 of the two action units from the thermal trip mechanism 8, so that an arc generated by the contact mechanism breaking is blocked by the blocking portion 132.

As shown in fig. 3-6, the middle cap 13 is a rectangular plate-shaped structure, the front and back sides of the middle cap 13 are recessed to form mounting grooves 131, the two mounting grooves 131 are opposite to each other to form a symmetrical structure, the mounting grooves 131 on the front and back sides of the middle cap 13 are respectively matched with the base 11 and the upper cap 12 to form two chambers, a boss serving as a static contact mounting portion 1313 is protruded from the middle upper portion of the bottom of the mounting groove 131, the static contact mounting portion 1313 is respectively matched with the static contact mounting portion 1313 disposed on the inner side walls of the base 11 and the upper cap 12, one side of the static contact mounting portion 3 in fig. 3 is a straight side wall, the lower portion of the static contact mounting portion 1313 is a circular arc, one side of the back-straight side wall is an inclined side wall with an inclined upper end, the other end of the static contact is bent back along the straight side wall, the circular arc side wall and the inclined side wall of the static contact mounting portion 1313 to form an arc guiding portion 521, a groove or protrusion structure is disposed in the middle of the static contact mounting portion 1313 (see fig. 4), thereby the middle cover 13, the base 11 and the upper cover 12 are mutually matched and connected; a plurality of fixing ribs 1311 of a strip-shaped protrusion are arranged in parallel and at intervals at the bottom of one side groove of the fixed contact mounting portion 1313 of the middle cover 13, and arc extinguishing grid pieces in the arc extinguishing chamber 61 can be fixed on the middle cover 13 by matching with the fixing ribs 1311, an arc-shaped plate-shaped structure is convexly arranged at the bottom of the other side groove of the fixed contact mounting part 1313 of the middle cover 13, one end of the arc-shaped plate-shaped structure extends out of the installation groove 131 to form a blocking part 132 opposite to the fixed contact installation part 1313, the other end of the arc-shaped plate-shaped structure is obliquely opposite to the fixed contact installation part 1313 to form a limiting part 1312 and is connected with the side wall of the lower part of the installation groove 131, the run-on angle 62 is matched and fixed on the limiting part 1312, one end of the run-on angle 62 extends into the arc extinguish chamber 61 along the limiting part 1312 and the side wall of the lower part of the installation groove 131, the other end of the movable contact 51 extends into the installation groove 131 of the middle cover 13, and swings between the fixed contact 52 and the stopper 132 along one side of the arc-isolating wall 63 under the driving of the operating mechanism 4; an assembling groove 1314 is arranged at the corner of the mounting groove 131 of the limiting part 1312 opposite to the static contact mounting part 1313, the permanent magnet 64 is assembled in the assembling groove 1314, a boss structure 1315 is convexly arranged at the bottom of the groove between the blocking part 132 and the fixing rib 1311, the boss structure 1315 is positioned below the static contact mounting part 1313, and the arc-isolating wall 63 is provided with a groove structure which is matched with the boss structure 1315 in an installing way; as shown in fig. 3-6, a space is left between the fixing rib 1311 and the side wall of the installation groove 131 at the side far from the blocking portion 132 to serve as an arc runner 1316, two ends of the arc runner 1316 are respectively communicated with the exhaust holes of the housing 1 through a through hole 1318 arranged on the middle cover 13, preferably, a separating portion 1317 is further arranged at one side of the arc runner 1316, the separating portion 1317 is arranged at the side wall of the installation groove 131 far from the blocking portion 132, after the arc extinguishing chamber 61 is assembled, the separating portion 1317 is abutted against and matched with the exhaust end of the arc extinguishing chamber 61 to separate the arc runner 1316 into two parts, in the figure, the arc runner 1316 is divided into an upper part and a lower part by the separating portion 1317, wherein one end of the upper part of the arc runner 1316 is provided with a through hole 1318, and one end of the lower part of the arc runner 1316 extends in the direction far from the blocking portion 132 and is provided with a through hole 1318 communicated with the outside at the end. In addition, in the present embodiment, a blocking structure 133 is disposed on the upper portion of the middle cover 13, the blocking structure 133 is located on a side away from the blocking portion 132, and the electromagnetic trip mechanism 7 may be mounted on the upper portion of the middle cover 13 between the blocking structure 133 and the blocking portion 132, where the blocking structure 133 may provide a limiting function for the electromagnetic trip mechanism 7.

As shown in fig. 7 to 9, an insulating spacer 14 is detachably clamped at both ends of the housing 1, in this embodiment, recessed regions are formed on the surfaces of the base 11 and the upper cover 12 at both sides of the wire connection opening 105, the recessed regions are used as insertion grooves 101, the housing 1 can be kept flat after the insulating spacer 14 is matched with the insertion grooves 101, a second clamping groove 103 is further recessed at the bottom of the insertion groove 101, the end of the second clamping groove 103 is bent towards one side to form a clamping region 104, in the figure, two upper and lower second clamping grooves 103 are arranged in the same insertion groove 101 of the upper cover 12 or the base 11, and the end of the second clamping groove 103 is bent towards the lower side in the figure to form a clamping region 104, so that the second clamping groove 103 and the clamping region 104 are integrally formed into an L-shaped groove structure; a first clamping groove 102 is arranged at one side of the wire connection port 105, and the first clamping groove 102 is arranged at the upper side of the wire connection port 105 in the figure.

The insulating partition 14 comprises a connecting plate 141 and two isolating plates 142, the connecting plate 141 is parallel and opposite to the side wall of the shell 1 on one side provided with the wire connecting port 105, a square hole serving as a wire threading port 1412 is formed in the middle of the connecting plate 141, the wire threading port 1412 corresponds to the wire connecting port 105, a U-shaped through hole is formed in the connecting plate 141 on one side of the wire threading port 1412, a clamping plate 1414 is formed in an area surrounded by the U-shaped through hole, a first clamping portion 1411 is formed at the tail end of one side of the clamping plate 1414 in a protruding mode, and the first clamping portion 1411 can be clamped and matched with the first clamping groove 102; the two isolation plates 142 are respectively connected to two sides of the connecting plate 141 and are perpendicular to the connecting plate 141, at this time, the whole insulating partition 14 is in an H shape, one sides of the two isolation plates 142 are inserted into the insertion grooves 101 at two ends of the shell 1, and the thickness of the isolation plates 142 is equal to the recessed degree of the insertion grooves 101, so that the shell 1 is kept flat; a second clamping portion 1421 is arranged on one side opposite to the two isolation plates 142, the tail end of the second clamping portion 1421 is bent towards one side to form a clamping portion 1423, when the insulation partition plate 14 is clamped, the clamping portion 1423 is firstly abutted against and matched with the second clamping groove 103 and falls into the clamping area 104 along with the connection plate 141 gradually approaching the housing 1, the second clamping portion 1421 is matched with the second clamping groove 103, and the first clamping portion 1411 is clamped with the first clamping groove 102; the isolating plate 142 is provided with a breaking groove 1422 on one side facing the connecting plate 141, the breaking groove 1422 is flush with one end of the connecting plate 141, when the incoming line terminal or the outgoing line terminal of two circuit breakers needs to be connected in series, the breaking groove 1422 is broken to shorten the length of the isolating plate 142, so that two adjacent insulating partition plates 14 are kept communicated, and a connecting row replaces a lead to connect two adjacent circuit breakers together, which is beneficial to shortening the length of the lead and reducing the cost. As shown in fig. 9, the miniature circuit breakers of the four poles embodiment are riveted together, the connection terminals 2 of the adjacent poles of the circuit breakers are separated by the isolation plate 142 to increase the creepage distance of the connection terminals 2 in the two poles circuit breaker, the left two poles circuit breaker is divided into one group in fig. 9, the right two poles circuit breaker is divided into one group, the breaking groove 1422 of the isolation plate 142 between the two left circuit breakers is broken, and the breaking groove 1422 of the isolation plate 142 between the two right circuit breakers is broken. The four-pole circuit breaker can be connected in the factory via a connection board 141 and used as a complete machine in a direct current system, for example, a DC1500V system.

The foregoing is a more detailed description of the present invention, taken in conjunction with specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments thereof. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims (10)

1. An operating mechanism of a miniature circuit breaker, comprising at least one lever (41) rotatably mounted on a housing (1) and two contact supports (43) rotatably mounted on the lever (41), each contact support (43) being connected to a movable contact (51), characterized in that: the two moving contacts (51) are electrically connected through a flexible coupling (511), each contact support (43) is also rotatably assembled with a torsion spring (46), and two ends of each torsion spring (46) are respectively abutted and matched with the contact supports (43) and the lever (41) to provide contact pressure for the moving contacts (51).

2. An operating mechanism of a small size circuit breaker according to claim 1, wherein: at least one side of the lever (41) is rotatably provided with a jump buckle (44) and a lock catch (45), the jump buckle (44) is in snap fit with one end of the lock catch (45), and the other end of the lock catch (45) is connected with a tripping hook (47).

3. An operating mechanism of a small size circuit breaker according to claim 2, wherein: two convex shafts are convexly arranged on the lever (41), and the jump buckle (44) and the lock catch (45) are respectively and rotatably assembled on the two convex shafts.

4. An operating mechanism of a small size circuit breaker according to claim 2, wherein: the two contact supports (43) are respectively arranged on two sides of the lever (41), the lock catch (45) is rotatably assembled on one side of the lever (41), and one end of the lock catch (45) is positioned between the two contact supports (43).

5. An operating mechanism of a small size circuit breaker according to claim 2, wherein: one end of the jump buckle (44) is connected with a connecting rod, and the operating mechanism (4) is connected with the handle mechanism (3) of the circuit breaker in a linkage manner through the connecting rod.

6. An operating mechanism of a small size circuit breaker according to claim 2, wherein: still rotate on hasp (45) and be connected with piece (48) that resets, the one end that resets (48) is connected with hasp (45), the other end that resets (48) be equipped with shell (1) inside wall complex wave elastic arm.

7. An operating mechanism of a small size circuit breaker according to claim 1, wherein: the center of torsional spring (46) is fixed in the rotation center that the contact supported (43), and the one end of torsional spring (46) supports the boss that (43) was supported with setting up and leans on the cooperation, and the other end of torsional spring (46) supports the cooperation with the boss that sets up on lever (41) to lean on.

8. An operating mechanism of a small size circuit breaker according to claim 1, wherein: the shell (1) is also internally provided with a mechanism main spring (42) for providing closing resistance or opening reset force, and two ends of the mechanism main spring (42) are respectively connected with the lever (41) and the shell (1).

9. An operating mechanism of a small-sized circuit breaker according to claim 1, wherein: two fixed contacts (52) are arranged on the opposite sides of the two moving contacts (51), and the two fixed contacts (52) are respectively matched with the two moving contacts (51).

10. An operating mechanism of a small size circuit breaker according to claim 1, wherein: the anti-theft lock is characterized in that two convex shafts are convexly arranged on one side of the lever (41), a jump buckle (44) and a lock catch (45) are respectively rotationally assembled on the two convex shafts, the jump buckle (44) is in snap fit with the lock catch (45), the other end of the lock catch (45) is connected with a tripping hook (47), the lock catch (45) is in linkage connection with the lever (41), a resetting piece (48) for providing resetting force for the lock catch (45) is further connected to the lock catch (45), and the resetting piece (48) and the jump buckle (44) are located on two sides of the lock catch (45); a mechanism main spring (42) is connected between the lever (41) and the shell (1).

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