CN217061975U - Air-blowing tripping mechanism and molded case circuit breaker - Google Patents

Abstract

The utility model provides a gas blow tripping device and circuit breaker, gas blow tripping device triggers operating device by arc extinguishing system's gas drive and trips, gas blow tripping device includes the casing and rotates the push rod of being connected with the casing, the casing is equipped with the sealed chamber of taking the gas blow passageway, the gas blow passageway is by the insulating barrier closing cap, and gas can blow insulating barrier and get into sealed intracavity, the push rod includes integrative swinging boom and the arm that resets that sets up, and the swinging boom rotates to be connected in one side of sealed chamber, and the one end of swinging boom is equipped with the operating portion relative with the operating device of circuit breaker, and the other end of swinging boom is equipped with the gas blow end, the gas blow end stretches into sealed intracavity and lies in one side of insulating barrier, can drive the swinging boom rotation under the gas action, and is elastic the arm that resets sets up in one side of swinging boom for the drive push rod resets. The utility model discloses a push rod is triggering operating device and accomplishing the back of threading off, resets by the arm that resets and casing cooperation, possesses simple structure, and the cooperation degree is high and advantage with low costs.

Description

Air-blowing tripping mechanism and molded case circuit breaker

Technical Field

The utility model relates to a low-voltage apparatus, concretely relates to air-blowing tripping device and moulded case circuit breaker.

Background

In a low-voltage distribution system, a circuit breaker is an important device for protecting power supply safety, and a gas blowing tripping structure of a molded case circuit breaker drives a push rod to move through a gas blowing channel of a shell so as to trip a product when the circuit breaker is in a short circuit. In current moulded case circuit breaker, the push rod among its air-blast tripping device adopts canceling release mechanical system cooperation installation such as pressure spring or torsional spring, realizes reseing after the dropout, and this kind of structure production efficiency is low and need increase the spring, easily exists the risk that became invalid or drop.

Disclosure of Invention

An object of the utility model is to overcome prior art's defect, provide a simple structure, high gas blow tripping device and moulded case circuit breaker of reliability.

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

the utility model provides a blowing tripping device, includes the casing and rotates the push rod of being connected with the casing, the casing is equipped with sealed chamber, sealed chamber is equipped with the blowing passageway, the blowing passageway is by the insulating barrier closing cap, and gas can blow insulating barrier and get into sealed intracavity, the push rod includes integrative swinging boom and the arm that resets that sets up, and the swinging boom rotates to be connected in one side of sealed chamber, and the one end of swinging boom is equipped with the operating portion relative with the operating device of circuit breaker, and the other end of swinging boom is equipped with the blowing end, the blowing end stretches into sealed intracavity and lies in one side of insulating barrier, can drive the swinging boom rotation under the gaseous effect, and is elastic the arm that resets sets up in one side of swinging boom for the drive push rod resets.

Further, the one end and the swinging boom of arm that resets are connected, leave the clearance between arm and the swinging boom that resets, and the other end of arm that resets is equipped with block portion, block portion and the draw-in groove butt that sets up at the casing.

Furthermore, a plurality of bent arc-shaped parts are arranged on the reset arm.

Further, offer the uncovered that supplies the air-blowing end to stretch into in one side of sealed chamber, the air-blowing end stretches into sealed intracavity through uncovered, is equipped with the rotation center of being connected with the casing rotation at the middle part of swinging boom, is equipped with the sealing between rotation center and air-blowing end, and at the push rod swing in-process, the uncovered messenger sealed chamber of sealing shutoff keeps encapsulated situation.

Further, uncovered department is provided with sealed bulge, corresponds on the lateral wall between sealed portion and the air-blowing end and is provided with the cooperation groove, at the push rod swing in-process, the sliding fit of cooperation groove and sealed bulge.

Further, the length of the open arcwall face of sealing part shutoff is greater than open opening length, and at the push rod swing in-process, the sealing part shutoff is uncovered all the time, perhaps the uncovered one side that is close to the air-blast passageway of shutoff all the time.

Furthermore, air-blowing channels are arranged on two sides of the sealing cavity, one end of each air-blowing channel is respectively communicated with an arc extinguishing system of an adjacent circuit breaker pole, and the other end of each air-blowing channel is used as a second air-blowing opening and is covered by an insulating partition plate; the sealing cavity is internally provided with a U-shaped insulating partition plate, the insulating partition plate comprises a connecting wall and a pair of elastic walls, the connecting wall is fixed in the sealing cavity, one end of each elastic wall is connected with one side of the connecting wall, and the pair of elastic walls respectively cover the second air blowing openings of the two air blowing channels.

Furthermore, the push rod comprises a rotating arm and a reset arm which are integrally formed, a rotating center which is rotationally connected with the shell is arranged in the middle of the rotating arm, one end part of the rotating arm protrudes to one side to form an operating part, the other end part of the rotating arm bends to extend to the other side to form an air blowing end, an arc-shaped sealing part is arranged between the rotation center and the air blowing end, a matching groove is arranged between the sealing part and the air blowing end, the matching groove is in sliding fit with a sealing bulge arranged on the shell, the rod body connected between the sealing bulge and the rotating center is of a fan-shaped structure, the circle centers of the sector structure and the arc sealing part are positioned on the central axis of the rotating center, the reset arm is connected on the rod body between the operating part and the rotating center, the middle part of the reset arm is bent to form at least two arc-shaped parts, and the clamping part of the reset arm is matched with the clamping groove formed in the shell to enable the reset arm to deform.

Further, the casing includes two lids, is equipped with first recess and second recess in every lid towards one side of push rod, and the first recess of two lids surrounds and forms the mounting groove the middle part of mounting groove is equipped with the rotation mounting hole that is used for rotating the assembly push rod, and the mounting groove is worn out to the operating portion and is used for cooperating with operating device, and the second recess of two lids surrounds and forms sealed chamber, is equipped with the air-blowing passageway with sealed chamber intercommunication on every lid, is equipped with the uncovered of mutual intercommunication between mounting groove and the sealed chamber, and the air-blowing end passes uncovered sealed intracavity of stretching into, is equipped with the draw-in groove with the arm complex that resets in the mounting groove close to open one side.

Furthermore, the middle side wall of the sealing cavity protrudes in opposite directions, so that the sealing cavity is divided into a swing space and an expansion space, the swing space provides a movement space for the air blowing end, and the insulating partition plate is assembled in the expansion space and is arranged on the air blowing channel sealing cover of the expansion space.

The molded case circuit breaker comprises a shell, and a gas-blowing tripping mechanism, an operating mechanism and an arc extinguishing system which are arranged in the shell, wherein an operating part of the gas-blowing tripping mechanism is arranged corresponding to the operating mechanism, and a gas-blowing channel of the gas-blowing tripping mechanism is communicated with the arc extinguishing system.

Preferably, be provided with two at least circuit breaker utmost point and at least one operating device in the shell, the circuit breaker utmost point includes looks utmost point shell and sets up contact mechanism and the arc extinguishing system in looks utmost point shell, is provided with between two adjacent circuit breaker utmost point the air-blast tripping device, form the casing of being connected with the push rod rotation by two adjacent looks utmost point shells are mutually supported.

Preferably, be provided with two at least circuit breaker poles and at least one operating device in the shell, the circuit breaker pole includes contact mechanism and arc extinguishing system, is provided with between two adjacent circuit breaker poles the air-blast tripping device, the arc extinguishing system of two circuit breaker poles is separated by air-blast tripping device's casing.

Preferably, the push rod of the air-blowing tripping mechanism is positioned between two circuit breaker poles, two operation parts are arranged at one end of the push rod in parallel, an avoidance groove is arranged between the two operation parts, and the two operation parts are respectively matched with the same operation mechanism.

Preferably, the air-blowing passageway of air-blowing tripping device and the arc extinguishing system intercommunication of adjacent circuit breaker utmost point, the arc extinguishing system includes the explosion chamber, offers the inside first air-blowing mouth of intercommunication explosion chamber in one side or both sides at explosion chamber middle part, first air-blowing mouth with set up in the one end intercommunication of the air-blowing passageway of casing, the other end of air-blowing passageway is as second air-blowing mouth and by insulating barrier closing cap.

Preferably, the operating mechanism comprises a pair of supports, and a rocker arm, a jump buckle, a lock catch and a re-buckle which are respectively assembled on the pair of supports in a rotating mode, the rocker arm is provided with a handle and a rocker arm spring, the re-buckle is in limit fit with the lock catch, an operating part of the push rod and the re-buckle are opposite to each other and used for triggering the operating mechanism to be tripped, the connecting rod assembly comprises a first connecting rod and a second connecting rod, a rocker arm shaft is arranged at one end of the second connecting rod, the rocker arm is connected with the rocker arm shaft through the rocker arm spring, one end of the first connecting rod is hinged to one end of the second connecting rod through the rocker arm shaft, the other end of the first connecting rod is connected with the jump buckle, and the other end of the second connecting rod is connected with the linkage piece.

Compare current push rod and need set up canceling release mechanical system alone, the utility model discloses an air-blowing tripping device and moulded case circuit breaker, its push rod triggers operating device to thread off when taking place short-circuit fault, after accomplishing the dropout, resets by the arm that resets of push rod and casing cooperation, possesses simple structure, and the high and with low costs advantage of cooperation degree does benefit to and improves air-blowing tripping device reliability.

In addition, the sealing part arranged on the push rod can ensure the sealing state of the sealing cavity, and particularly, the sealing bulge part is arranged at the opening of the sealing cavity to be matched with the matching groove of the push rod, so that the sealing performance of the sealing cavity is ensured, and meanwhile, a guiding effect is provided for the swinging of the push rod.

In addition, the air-blowing tripping mechanism is arranged between the two circuit breaker poles, and the insulating partition plate arranged in the expansion space can simultaneously cover the second air-blowing ports of the two air-blowing channels, so that the internal space is saved, and the functional stability of the insulating partition plate is guaranteed.

In addition, through the casing that sets up the assembly push rod alone or form the casing by the cooperation of the looks utmost point shell of two circuit breaker poles jointly, make the air-blast tripping device can be applicable to double-break point or single-break point circuit breaker, have the advantage that application scope is wide.

Drawings

Fig. 1 is a schematic structural diagram of a molded case circuit breaker according to the present invention (a first embodiment);

fig. 2 is a schematic structural view (not tripped) of a circuit breaker pole of a first embodiment of the present invention;

FIG. 3 is a schematic view of the construction of the putter of FIG. 2;

fig. 4 is a schematic structural diagram (tripping) of a first embodiment circuit breaker pole of the present invention;

FIG. 5 is a schematic view of the construction of the putter of FIG. 4;

fig. 6 is a schematic structural view of a phase pole housing according to a first embodiment of the present invention;

fig. 7 is a schematic structural diagram of the arc-extinguishing chamber in the present invention;

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

fig. 9 is a schematic structural diagram (three arc extinguishing systems) of an arc extinguishing chamber and a gas blow tripping mechanism according to a second embodiment of the present invention;

fig. 10 is a schematic structural view (an arc extinguishing system) of an arc extinguishing chamber and a gas blow tripping mechanism according to a second embodiment of the present invention;

fig. 11 is a schematic structural view of an air-blowing trip mechanism according to a second embodiment of the present invention;

fig. 12 is a schematic structural view of a push rod and a housing according to a second embodiment of the present invention;

fig. 13 is a schematic structural view (side facing the push rod) of a housing according to a second embodiment of the present invention;

fig. 14 is a schematic structural view (side facing the arc extinguishing chamber) of a housing according to a second embodiment of the present invention.

Detailed Description

The following describes a specific embodiment of the molded case circuit breaker according to the present invention with reference to the embodiments shown in fig. 1 to 14. The present invention is not limited to the description of the following embodiments.

The utility model provides a moulded case circuit breaker includes the shell be provided with at least one circuit breaker utmost point 1 and at least one operating device 2 in the shell, operating device 2 is used for driving circuit breaker utmost point 1 and carries out the divide-shut brake action, operating device 2 includes hasp complex jump buckle and hasp, detains 21 again with the spacing complex of hasp to and link assembly and linkage, every circuit breaker utmost point 1 includes contact mechanism and arc extinguishing system, contact mechanism passes through linkage and operating device 2 linkage, and the contact mechanism of two adjacent circuit breaker utmost points 1 passes through the linkage, makes operating device 2 can synchronous divide-shut brake action of all contact mechanisms in the synchronous drive circuit breaker utmost point 1, and arc extinguishing system sets up with contact mechanism relatively for extinguish the electric arc that produces when contact mechanism divides-shut brake.

Specifically, the contact mechanism includes a moving contact and a fixed contact which are matched with each other to connect or disconnect a circuit, and when the contact mechanism is a double-breakpoint contact mechanism, the arc extinguishing system is arranged in pair and is respectively matched with a group of moving contacts and a group of fixed contacts, as shown in fig. 7, the arc extinguishing system includes an arc extinguishing chamber 31, a plurality of arc extinguishing bars arranged in a stacked manner are assembled in the arc extinguishing chamber 31, and a first air blowing port 32 communicated with the interior of the arc extinguishing chamber 31 is formed in one side or two sides of the arc extinguishing chamber 31. In addition, in a multipole circuit breaker, each breaker pole 1 may comprise a phase pole housing 11 enclosing the breaker pole 1, but it is equally possible to do without a phase pole housing 11.

The improvement point of this application lies in, still is provided with at least one air-blast tripping device 4 in the shell, air-blast tripping device 4 sets up in one side of circuit breaker utmost point 1, preferably as shown in fig. 1, 9, in multi-pole circuit breaker, air-blast tripping device 4 sets up between two adjacent circuit breaker utmost points 1, and wherein air-blast tripping device 4 includes casing 41 and the push rod 42 of being connected with casing 41 rotation, casing 41 is equipped with the seal chamber, the seal chamber communicates through an air-blast passageway 411 with the arc extinguishing system of adjacent circuit breaker utmost point 1, and that is also air-blast passageway 411 communicates with the first air-blast mouth 32 of explosion chamber 31, and air-blast passageway 411 is covered by insulating barrier 43.

Preferably, as shown in figures 2, 4 and 12, an insulating spacer 43 is disposed within the sealed cavity; push rod 42 includes swinging boom and the arm 423 that resets, and swinging boom and the integrative setting of arm 423 that resets rotate, and the swinging boom rotates to be connected in one side of sealed chamber, and the one end of swinging boom is equipped with the operation portion 421 relative with operating device 2, and the other end of swinging boom is equipped with air-blowing end 422, air-blowing end 422 stretches into sealed intracavity and lies in one side of insulating barrier 43, can drive the swinging boom rotation under the gas action, and is elastic the arm 423 that resets sets up in one side of swinging boom for drive push rod 42 resets. When short-circuit fault occurs, gas generated by the arc extinguishing system flows through the air blowing channel 411 and blows the insulating partition plate 43 to enter the sealed cavity, so that the air blowing end 422 drives the rotating arm to rotate under the action of air pressure, the operating part 421 triggers the operating mechanism 2 to trip, the reset arm 423 is matched with the shell 41 to deform (see fig. 4 and 5), and after the tripping is completed, the reset arm 423 is matched with the adjustable device to restore to the original state so as to drive the push rod 42 to reset (see fig. 2 and 3).

Compare current push rod 42 and need set up canceling release mechanical system alone, air-blowing tripping mechanism 4 and be equipped with this air-blowing tripping mechanism 4's moulded case circuit breaker, its push rod 42 triggers operating device 2 and trips when taking place short-circuit fault, and after accomplishing the dropout, by push rod 42's the arm 423 that resets and 41 cooperation of casing resets, possesses simple structure, and the cooperation degree is high, and is with low costs, does benefit to the reliability that improves air-blowing tripping mechanism 4 simultaneously.

A first embodiment is provided in conjunction with fig. 1-8, in this embodiment, the molded case circuit breaker is a multi-pole circuit breaker, the circuit breaker comprises three circuit breaker poles 1 arranged in parallel, an operating mechanism 2 and two air-blowing tripping mechanisms 4, wherein each circuit breaker pole 1 comprises a phase pole shell 11, the three circuit breaker poles 1 are spliced together through the respective phase pole shells 11, all the phase pole shells 11 jointly form the shell of the molded case circuit breaker, a pair of arc extinguishing systems and a contact mechanism (not shown) are arranged in each phase pole shell 11, the pair of arc extinguishing systems are correspondingly assembled at two ends of each phase pole shell 11 respectively, the contact mechanism is arranged between the two arc extinguishing systems in a matching mode, the contact mechanism comprises a pair of fixed contacts and a moving contact, the pair of fixed contacts are arranged in a matching mode with the pair of arc extinguishing systems in a one-to-one correspondence mode respectively, the moving contact comprises a rotating shaft and two contact arms, and the two contact arms rotate along with the rotating shaft and are matched with the two fixed contacts respectively to form the double-breakpoint contact mechanism.

The operating mechanism 2 comprises a pair of supports, a rocker arm, a jump buckle, a lock catch, a re-buckle 21, a connecting rod assembly and a linkage piece, the pair of supports are oppositely arranged at two sides of the middle breaker pole 1, the rocker arm is rotatably supported on the pair of supports and is provided with a handle, the rocker arm and the handle are positioned above the middle part of the middle breaker pole 1 and are used for driving the breaker to perform opening and closing actions, the rocker arm is connected with a rocker arm shaft arranged on the connecting rod assembly through a rocker arm spring, the jump buckle, the lock catch, the re-buckle 21 and a traction rod are respectively and rotatably assembled at the upper parts of the inner sides of the pair of supports, wherein the jump buckle is in hasp fit with the lock catch, the re-buckle 21 corresponds to one end of the middle breaker pole 1, namely corresponds to the upper part of an arc extinguishing system of the middle breaker pole 1, the re-buckle 21 is in limit fit with the lock catch, a contact mechanism of the breaker is correspondingly assembled at the lower parts of the pair of supports and is driven by the linkage piece to perform opening and closing actions, the lower part of the support is provided with an avoiding hole for penetrating and connecting a linkage piece, the linkage piece penetrates through the avoiding hole to extend out of the support and can be in linkage connection with contact mechanisms of other circuit breaker poles 1, the linkage piece is connected with the jump buckle through a linkage assembly, preferably, the linkage assembly comprises a first connecting rod and a second connecting rod, a rocker arm shaft is arranged at one end of the second connecting rod, one ends of the first connecting rod and the second connecting rod are hinged through the rocker arm shaft, the other end of the first connecting rod is connected with the jump buckle, and the other end of the second connecting rod is connected with the linkage piece to drive the contact mechanisms to perform opening and closing actions.

As shown in fig. 1, two air-blowing tripping mechanisms 4 are disposed between two adjacent circuit breaker poles 1, and each air-blowing tripping mechanism 4 is respectively matched with a re-buckle 21 of the operating mechanism 2, so as to trigger the operating mechanism 2 to trip when a short-circuit fault occurs. When the operating mechanism 2 is buckled, namely the jump buckle is matched with the buckle, and the buckle is in limit matching with the relock 21, the handle can drive the contact mechanism to perform switching-on and switching-off actions through the rocker arm, when a circuit fails, the air-blowing tripping mechanism 4 drives the relock 21 to be released from limit matching with the buckle, so that the buckle is released from the buckle matching with the jump buckle, the rocker arm is reset, the operating mechanism 2 is tripped, and when the operating mechanism 2 is tripped, the rocker arm spring drives the contact mechanism to act.

In the present embodiment, each air-blowing tripping mechanism 4 comprises a housing 41 and a push rod 42 rotatably mounted on the housing 41, and the push rod 42 is engaged with the rebuckling 21 of the operating mechanism 2. As shown in fig. 2, 4 and 6, the housing 41 includes two oppositely disposed covers, and the two covers are disposed between the arc extinguishing systems of two adjacent breaker poles 1 in parallel, in this embodiment, the housing of the air-blast tripping mechanism 4 is formed by the phase pole housings 11 of two adjacent breaker poles 1 in cooperation, that is, the right side of the phase pole housing 11 in the left breaker pole 1 and the left side of the phase pole housing 11 in the middle breaker pole 1 are respectively used as two covers to form the housing 41 of the left air-blast tripping mechanism 4, the right side of the phase pole housing 11 in the middle breaker pole 1 and the left side of the phase pole housing 11 in the right breaker pole 1 are respectively used as a pair of covers to form the housing 41 of the right air-blast tripping mechanism 4 in cooperation, of course, the air-blast tripping mechanism 4 may also be provided with the housing 41 alone, and the housing 41 is spliced with each phase pole housing 11, but such a structure may increase the overall volume of the molded case circuit breaker, the length of the air blowing passage 411 is extended and the requirement for the sealing property of the air blowing passage 411 is high, resulting in an increase in cost thereof.

As shown in fig. 6, a first groove 412 and a second groove are provided on one side of each cover facing the push rod 42, the first grooves 412 of the two covers surround to form a mounting groove, a rotary mounting hole 4121 for rotatably mounting the push rod 42 is provided in the middle of the mounting groove, the operating portion 421 penetrates the mounting groove to be fitted with the relocking 21 of the operating mechanism 2, the second grooves of the two covers surround to form a sealing cavity, an air blowing channel 411 is provided on each cover to communicate with the sealing cavity, an opening 415 is provided between the mounting groove and the sealing cavity, preferably, a sealing protrusion 416 is provided on the side wall of the housing 41 at the opening 415 to reduce the size of the opening 415, the sealing protrusion 416 is an arc-shaped strip structure, the circular arc center is located on the central axis of the rotary mounting hole 4121, the air blowing end 422 penetrates the opening 415 to extend into the sealing cavity, a slot 417 fitted with the reset arm 423 is provided on one side of the mounting groove adjacent to the opening 415, the blocking portion 418 is provided at one end of the sealing protrusion 416 in the drawing, the blocking portion 417 is formed by a gap between the blocking portion 418 and a side wall of the mounting groove, and the blocking portion 418 is connected to a left end of the sealing protrusion 416 in an inclined manner in fig. 6, so as to separate the opening 415 from the blocking portion 417.

An air blowing channel 411 penetrating through the cover body is arranged on one side of the sealed cavity far away from the opening 415, one end of the air blowing channel 411 is communicated with an arc extinguishing system, namely one end of the air blowing channel 411 is communicated with a first air blowing opening 32 of an arc extinguishing chamber 31, the other end of the air blowing channel 411 is used as a second air blowing opening 414 covered by an insulating partition plate 43, specifically, as shown in fig. 6, the side wall of the middle part of the sealed cavity protrudes towards each other to form a narrow connecting area, the sealed cavity is integrally formed into a thin cavity body with two thick ends and a middle part, so that the sealed cavity is divided into a swinging space 4131 and an expansion space 4132 by the protruding side wall, wherein the opening 415 is arranged at one end of the swinging space 4131, the air blowing end 422 extends into the swinging space 4131, the swinging space 4131 provides a movement space required by the air blowing end 422, the insulating partition plate 43 is arranged in the expansion space 4132 to cover the second air blowing opening 414, when a short-circuit fault does not occur, the insulating partition 43 covers the second air blowing opening 414 disposed in the middle of the expansion space 4132, and in the event of a short circuit fault, the expansion space 4132 provides a moving space for the insulating partition 43, in this embodiment, the air-blowing tripping mechanism 4 is correspondingly disposed between the arc extinguishing systems of the two circuit breaker poles 1, so that two air-blowing channels 411 are disposed on the housing 41 and respectively communicate with the two adjacent arc extinguishing systems, that is, one second air blowing opening 414 is disposed on both side walls of the expansion space 4132, and preferably, the insulating partition 43 disposed in the sealing space can simultaneously cover the two second air blowing openings 414.

A specific structure of the insulating spacer 43 is provided in conjunction with fig. 2, 4 and 8, the insulating spacer 43 is a U-shaped insulating spacer 43, the insulating partition 43 includes a connecting wall 431 and a pair of elastic walls 432, the connecting wall 431 is fixed in the sealing chamber on the side far from the opening 415 in the direction perpendicular to the two covers, that is, on the side far from the swinging space 4131 of the expansion space 4132, one end of each elastic wall 432 is connected to one side of the connecting wall 431, the other end of each elastic wall 432 is adjacent to the blowing end 422, the middle part of each elastic wall 432 is attached to the bottom wall of the sealing chamber of each cover to cover the second blowing opening 414, the two elastic walls 432 are respectively covered on the two second blowing openings 414, due to the vertically arranged connecting wall 431, one end of the elastic wall 432 moves away from or close to the second air blowing opening 414 along the direction perpendicular to the bottom wall of the sealed cavity, so that the structure can save the inner space and is beneficial to ensuring the functional stability of the insulating partition 43.

As shown in fig. 3-5, the push rod 42 includes an integrally formed rotating arm and a reset arm 423, a rotating center 425 rotatably connected to the housing 41 is disposed in the middle of the rotating arm, and an end of the rotating arm protrudes to one side to form an operating portion 421, in this embodiment, the push rod 42 is matched with the rebuckling 21 of the same operating mechanism 2, and only one operating portion 421 is disposed; the other end of the rotating arm is bent and extended to the other side to form an air blowing end 422, and in the figure, the air blowing end 422 forms a rod-shaped structure which is bent to the direction back to the operating part 421; an arc-shaped sealing part 424 is arranged between the rotating center 425 and the air blowing end 422, two ends of the sealing part 424 protrude out of two sides of the rotating arm respectively, the whole length of an arc-shaped surface of the sealing part 424 for blocking the opening 415 is larger than the opening length of the opening 415, the sealing part 424 always blocks the opening 415 or one side of the opening 415 close to the air blowing channel 411 in the swinging process of the push rod 42, the sealing part 424 always blocks one side of the opening 415 close to the air blowing channel 411 in the embodiment, and the sealing effect is achieved through the sealing part 424 and the air blowing end 422; a matching groove 4241 is formed in the side wall between the sealing portion 424 and the air blowing end 422 and corresponds to the sealing protrusion 416, the matching groove 4241 is in sliding fit with the sealing protrusion 416 arranged on the shell 41, the matching groove 4241 and the sealing protrusion 416 are both of arc-shaped strip structures, the circle centers of the matching groove 4241 and the sealing protrusion 416 are located on the central axis of the rotating center 425, when the push rod 42 rotates around the rotating center 425, the matching groove 4241 and the sealing protrusion 416 are matched with each other to slide, so that the sealing portion 424 can block the opening 415, the sealing performance of a sealing cavity of the push rod 42 in the swinging process can be reliably guaranteed, in addition, the sliding fit of the matching groove 4241 and the sealing protrusion 416 also provides a guiding effect for the rotation of the push rod 42, and the push rod 42 is prevented from swinging in other directions; the rod body connected between the sealing part 424 and the rotating center 425 is in a fan-shaped structure 426, the circle centers of the fan-shaped structure 426 and the arc-shaped sealing part 424 are positioned on the central axis of the rotating center 425, and the sealing part 424 is an arc-shaped fan-shaped surface of the fan-shaped structure 426; one end of the reset arm 423 is connected with the rotating arm, specifically connected to the rod body between the operation portion 421 and the rotating center 425, a gap is left between the reset arm 423 and the rotating arm, the other end of the reset arm 423 is provided with a clamping portion 427, and in the rotating process of the push rod 42, the clamping portion 427 is abutted against a clamping groove 417 arranged in the housing 41 to make the reset arm 423 generate elastic deformation; furthermore, the reset arm 423 is provided with a plurality of curved arc portions 4231, the middle of the reset arm 423 is curved to form two arc portions 4231, the arc portions 4231 are beneficial to enhancing the structural strength of the reset arm 423, not only increasing elasticity, but also preventing the reset arm 423 from breaking due to elastic deformation, in the figure, an obtuse circular clamping portion 427 is formed at the end of the reset arm 423, the clamping portion 427 extends into the clamping groove 417, when short-circuit failure does not occur, the operating portion 421 is opposite to but not in contact with the relocking 21, at this time, a gap is left between the reset arm 423 and the rotating arm, the clamping portion 427 is matched with the clamping groove 417, after short-circuit failure occurs, the air blowing end 422 is blown to trigger the relocking 21 by the operating portion 421, at this time, the air blowing end 422 swings towards the direction of the clamping portion, the clamping portion 427 is abutted against the clamping groove 417 to enable the reset arm 423 to be elastically pressed in the process, so that the gap between the reset arm 423 and the rotating arm 427 is reduced, after the tripping is completed, the air pressure of the blowing air blowing end 422 disappears, the clamping portion 427 and the clamping groove 417 abut against each other to restore the reset arm 423 so as to drive the rotating arm to swing back, the gap between the rotating arm and the reset arm 423 is gradually increased to the original state, and the push rod 42 is restored to the original state. It should be noted that the engaging portion 427 may also be disposed at other positions of the reset arm 423, and correspondingly, the position of the engaging slot 417 engaged with the engaging portion 427 is also changed correspondingly, and in addition, an avoiding structure may be disposed on the reset arm 423 to ensure smooth rotation of the push rod 42.

With reference to fig. 9 to 14, a second embodiment of the molded case circuit breaker is provided, in this embodiment, the molded case circuit breaker is a multi-pole circuit breaker, and takes three circuit breaker poles 1, one operating mechanism 2 and two gas blow-off tripping mechanisms 4, which are arranged in parallel as an example, each circuit breaker pole 1 includes an arc extinguishing system and a contact mechanism, the operating mechanism 2 includes a rocker arm, a trip, a latch, a relocking 21 and a linkage assembly, the connection mode and the operation principle of the operating mechanism are the same as those of the first embodiment, the operating mechanism 2 is in linkage connection with the contact mechanism, in this embodiment, the contact mechanism is a single-breakpoint contact mechanism, the contact mechanism includes a moving contact and a fixed contact which are matched with each other, the arc extinguishing system is arranged at one side of the fixed contact and located at one end of the circuit breaker pole 1, the arc extinguishing system includes an arc extinguishing chamber 31, a plurality of arc extinguishing grids are stacked in the arc extinguishing chamber 31, a first air blowing port 32 communicating with the inside is provided at one side or both sides of the arc extinguishing chamber 31.

As shown in fig. 9 and 10, two gas-blowing tripping mechanisms 4 are respectively disposed between two adjacent circuit breaker poles 1, each gas-blowing tripping mechanism 4 is located at one end where an arc extinguishing system is disposed, in this embodiment, each circuit breaker pole 1 is not provided with a phase pole housing 11, the arc extinguishing systems connected to two circuit breaker poles 1 are separated by a housing 41 of the gas-blowing tripping mechanism 4, the housing 41 includes two oppositely disposed covers, a push rod 42 is rotatably assembled between the two covers, and an operating portion 421 of the push rod 42 extends out from one end of the housing 41 to be matched with the operating mechanism 2.

As shown in fig. 11 to 14, a first groove 412 and a second groove, which are the same as those in the first embodiment, are provided on one side of each cover, the first groove 412 and the second groove of the two covers surround to form an installation groove and a sealed cavity, respectively, wherein the installation groove and the sealed cavity are kept communicated through an opening 415, a sealed protrusion 416 is formed on the inner wall of the housing 41 of the opening 415, the sealed protrusion 416 is the same as that in the first embodiment and has an arc-shaped strip structure, and different from the first embodiment, a blocking portion 418 is not provided at one end of the sealed protrusion 416, and a gap between one end of the sealed protrusion 416 and a side wall of the installation groove is directly used as a clamping groove 417 to abut against a clamping portion 427 of the reset portion.

In this embodiment, the sealed chamber is divided into the same swing space 4131 and expansion space 4132 as the first embodiment by the side wall also protruded, an air blowing passage 411 penetrating the cover is provided in the middle of the expansion space 4132, and the second air blowing port 414 of the air blowing passage 411 is located in the expansion space 4132 and covered by the insulating partition 43, wherein the insulating partition 43 has the same U-shaped structure as the first embodiment, so that the two second air blowing ports 414 can be covered at the same time.

As shown in fig. 11 and 12, the push rod 42 of the present embodiment includes a reset arm 423 and a rotating arm, wherein the reset arm 423 is identical to the first embodiment, except that two parallel operating portions 421 are provided in the rotating arm, the rest of the rotating arm is identical to the first embodiment, in addition, the two operating portions 421 have the same shape as the operating portions 421 in the first embodiment, the two parallel operating portions 421 are respectively matched with the same operating mechanism 2, and an avoiding groove is provided between the two parallel operating portions 421, and the avoiding groove avoids interference between the operating portions 421 and the operating mechanism 2.

In the multi-pole circuit breaker, not only one operating mechanism 2 is provided, but also the air-blowing tripping mechanism 4 may be provided on both sides of each operating mechanism 2 or on one side of each operating mechanism 2, or the air-blowing tripping mechanism 4 may be provided only on both sides or one side of one of the operating mechanisms 2, and the remaining operating mechanisms 2 operate by interlocking, but the tripping protection effect is not as good as that of the air-blowing tripping mechanism 4 provided on both sides of the operating mechanism 2.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model discloses to the ordinary skilled person in technical field's the prerequisite that does not deviate from the utility model discloses under the 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 (16)

1. The utility model provides a blowing tripping device, includes casing (41) and with casing (41) the push rod (42) of being connected of rotating, casing (41) are equipped with sealed chamber, sealed chamber is equipped with blowing passageway (411), blowing passageway (411) are by insulating barrier (43) closing cap, and gas can blow insulating barrier (43) and get into sealed intracavity, its characterized in that: push rod (42) are including integrative swing arm that sets up and reset arm (423), and the swing arm rotates to be connected in one side of sealed chamber, and the one end of swing arm is equipped with operation portion (421) relative with operating device (2) of circuit breaker, and the other end of swing arm is equipped with air-blowing end (422), air-blowing end (422) stretch into sealed intracavity and lie in one side of insulating barrier (43), can drive the swing arm rotation under the gas action, and is elastic reset arm (423) set up in one side of swing arm for drive push rod (42) reset.

2. The air blast trip unit of claim 1, further comprising: one end of the reset arm (423) is connected with the rotating arm, a gap is reserved between the reset arm (423) and the rotating arm, the other end of the reset arm (423) is provided with a clamping part (427), and the clamping part (427) is abutted to a clamping groove (417) arranged on the shell (41).

3. An air blast trip unit according to claim 1 or 2, wherein: the reset arm (423) is provided with a plurality of bent arc parts (4231).

4. The air blast trip unit of claim 1, wherein: offer the uncovered (415) that supply air-blowing end (422) to stretch into in one side of seal chamber, air-blowing end (422) stretches into the seal chamber through uncovered (415), be equipped with in the middle part of swinging boom and rotate rotation center (425) of being connected with casing (41), be equipped with between rotation center (425) and air-blowing end (422) sealing (424), at push rod (42) swing in-process, sealing (424) shutoff uncovered (415) make the seal chamber keep encapsulated situation.

5. The air blast trip unit of claim 4, wherein: a sealing protruding part (416) is arranged at the opening (415), a matching groove (4241) is correspondingly arranged on the side wall between the sealing part (424) and the air blowing end (422), and the matching groove (4241) is in sliding fit with the sealing protruding part (416) in the swinging process of the push rod (42).

6. The air blast trip unit of claim 4, wherein: the length of the arc-shaped surface of the sealing part (424) blocking the opening (415) is larger than the opening length of the opening (415), and in the swing process of the push rod (42), the sealing part (424) always blocks the opening (415), or the sealing part (424) always blocks one side of the opening (415) close to the air blowing channel (411).

7. The air blast trip unit of claim 1, wherein: both sides of the sealed cavity are provided with air blowing channels (411), one ends of the two air blowing channels (411) are respectively used for being communicated with an arc extinguishing system of an adjacent circuit breaker pole (1), and the other ends of the air blowing channels (411) are used as second air blowing openings (414) and are covered by insulating partition plates (43); a U-shaped insulating partition plate (43) is arranged in the sealed cavity, the insulating partition plate (43) comprises a connecting wall (431) and a pair of elastic walls (432), the connecting wall (431) is fixed in the sealed cavity, one end of each elastic wall (432) is connected with one side of the connecting wall (431), and the pair of elastic walls (432) respectively cover the second air blowing openings (414) of the two air blowing channels (411).

8. The air blast trip unit of claim 1, further comprising: the push rod (42) comprises a rotating arm and a reset arm (423) which are integrally formed, a rotating center (425) which is connected with the shell (41) in a rotating mode is arranged in the middle of the rotating arm, one end of the rotating arm protrudes to one side to form an operating part (421), the other end of the rotating arm bends and extends to the other side to form an air blowing end (422), an arc-shaped sealing part (424) is arranged between the rotating center (425) and the air blowing end (422), a matching groove (4241) is arranged between the sealing part (424) and the air blowing end (422), the matching groove (4241) is in sliding fit with a sealing protruding part (416) arranged on the shell (41), a rod body connected between the sealing part (424) and the rotating center (425) is of a fan-shaped structure (426), the circle centers of the fan-shaped structure (426) and the arc-shaped sealing part (424) are located on the central axis of the rotating center (425), the reset arm (423) is connected to a rod body between the operation portion (421) and the rotation center (425), the middle of the reset arm (423) is bent to form at least two arc-shaped portions (4231), and the clamping portion (427) of the reset arm (423) is matched with the clamping groove (417) formed in the shell (41) to enable the reset arm (423) to deform.

9. The air blast trip unit of claim 1, further comprising: the casing (41) comprises two covers, wherein a first groove (412) and a second groove are formed in one side, facing the push rod (42), of each cover, the first grooves (412) of the two covers surround to form an installation groove, a rotating installation hole (4121) used for rotatably assembling the push rod (42) is formed in the middle of the installation groove, an operation portion (421) penetrates out of the installation groove and is used for being matched with the operation mechanism (2), a sealing cavity is formed in the second grooves of the two covers, an air blowing channel (411) communicated with the sealing cavity is formed in each cover, an opening (415) communicated with each other is formed between the installation groove and the sealing cavity, an air blowing end (422) penetrates through the opening (415) and extends into the sealing cavity, and a clamping groove (417) matched with a reset arm (423) is formed in one side, close to the opening (415), of the installation groove.

10. The air blast trip unit of claim 1, further comprising: the side wall of the middle part of the sealing cavity protrudes oppositely, so that the sealing cavity is divided into a swinging space (4131) and an expansion space (4132), the swinging space (4131) provides a movement space for the blowing end (422), and the insulating partition plate (43) is assembled in the expansion space (4132) and covers the blowing channel (411) arranged in the expansion space (4132).

11. A molded case circuit breaker, characterized in that: the air-blowing tripping mechanism (4), the operating mechanism (2) and the arc extinguishing system are arranged in the shell, the air-blowing tripping mechanism (4) is arranged in the shell according to any one of claims 1 to 10, the operating part (421) of the air-blowing tripping mechanism (4) is arranged corresponding to the operating mechanism (2), and the air-blowing channel (411) of the air-blowing tripping mechanism (4) is communicated with the arc extinguishing system.

12. A molded case circuit breaker according to claim 11, wherein: be provided with two at least circuit breaker utmost point (1) and at least one operating device (2) in the shell, circuit breaker utmost point (1) is provided with between two adjacent circuit breaker utmost point (1) including looks utmost point shell (11) and contact mechanism and the arc extinguishing system of setting in looks utmost point shell (11) gas blow tripping device (4), form casing (41) of being connected with push rod (42) rotation by two adjacent looks utmost point shells (11) mutually supporting.

13. A molded case circuit breaker according to claim 11, wherein: be provided with two at least circuit breaker utmost point (1) and at least one operating device (2) in the shell, circuit breaker utmost point (1) is provided with between two adjacent circuit breaker utmost point (1) gas blowing tripping device (4) including contact mechanism and arc extinguishing system, is separated the arc extinguishing system of two circuit breaker utmost point (1) by casing (41) of gas blowing tripping device (4).

14. A molded case circuit breaker according to claim 13, wherein: push rod (42) of air-blowing tripping mechanism (4) are located between two circuit breaker poles (1) the one end of push rod (42) is provided with two operating portion (421) in parallel, is equipped with between two operating portion (421) and dodges the groove, and two operating portion (421) cooperate with same operating mechanism (2) respectively.

15. A molded case circuit breaker according to claim 12 or 13, characterized in that: the air-blowing passage (411) of air-blowing tripping mechanism (4) communicates with the arc extinguishing system of adjacent circuit breaker pole (1), the arc extinguishing system includes explosion chamber (31), offers intercommunication explosion chamber (31) inside first air-blowing mouth (32) in one side or both sides at explosion chamber (31) middle part, first air-blowing mouth (32) with set up in the one end intercommunication of the air-blowing passage (411) of casing (41), the other end of air-blowing passage (411) is as second air-blowing mouth (414) and by insulating barrier (43) closing cap.

16. A molded case circuit breaker according to claim 11, wherein: the operating mechanism (2) comprises a pair of supports, and a rocker arm, a jump buckle, a lock catch and a re-buckle (21) which are respectively assembled on the pair of supports in a rotating mode, wherein the rocker arm is provided with a handle and a rocker arm spring, the re-buckle (21) is in limit fit with the lock catch, an operating part (421) of the push rod (42) and the re-buckle (21) are used for triggering the operating mechanism (2) to trip oppositely, the connecting rod assembly comprises a first connecting rod and a second connecting rod, a rocker arm shaft is arranged at one end of the second connecting rod, the rocker arm is connected with the rocker arm shaft through the rocker arm spring, the first connecting rod is hinged to one end of the second connecting rod through the rocker arm shaft, the other end of the first connecting rod is connected with the jump buckle, and the other end of the second connecting rod is connected with the linkage member.

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