CN211376577U - Direct-current high-breaking magnetic blow-out quick circuit breaker - Google Patents

Abstract

The utility model discloses a high disconnected magnetism of dividing of direct current blows quick circuit breaker, including main body frame, the arc-extinguish chamber, main conductive loop, quick magnetic trip gear, the magnetism system of blowing, operating device and auxiliary control case, a serial communication port, the top at main body frame is established to the arc-extinguish chamber, main conductive loop establishes in main body frame one side, operating device and auxiliary control case establish the opposite side at main body frame, quick magnetic trip gear establishes inside main body frame, wherein, connect the static contact on the main conductive loop, operating device is used for driving the moving contact through traction lever connection moving contact and is close to or keeps away from the static contact, the auxiliary control case is used for showing the divide-shut brake state of moving contact through connecting rod and moving contact hookup, the magnetism system of blowing is for establishing the static contact, moving contact and the excitation structure between the arc-extinguish chamber. The magnetic fields are generated in the conductive loops at the early stage and the later stage of the breaking of the moving contact respectively through the excitation structure, arc-drawing acting force is generated on fault current electric arcs, the electric arcs can enter the arc extinguishing cover more quickly, and the purpose of quick breaking is achieved.

Description

Direct-current high-breaking magnetic blow-out quick circuit breaker

Technical Field

The utility model relates to a circuit breaker equipment field, concretely relates to quick circuit breaker of high branch breaking magnetism of direct current blows.

Background

The direct-current quick circuit breaker is mainly applied to a rail transit power supply system, and can quickly realize opening and closing work when the power supply system breaks down, so that guarantee is provided for safe operation of the rail transit power supply system. One type adopts the excitation of the additional secondary coil, realize the magnetic blow-out effect through electronic control, need to judge the secondary coil current according to the primary current direction, increase the complexity of control, when the short-circuit fault happens, if control fails, will lead to breaking and failing, cause the major accident, the reliability is greatly reduced; (2) one type adopts an excitation iron core to be installed in a primary loop, has no magnetic conduction plate structure, forms a magnetic blow-out magnetic field through an air medium, and has extremely low magnetic field intensity and weak arc discharge effect.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a direct current high branch divides disconnected magnetic blow fast breaker to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a direct-current high-breaking magnetic-blowing quick breaker comprises a main body frame, an arc extinguishing cover, a main conductive loop, a quick magnetic tripping device, a magnetic-blowing system, an operating mechanism and an auxiliary control box, wherein the arc extinguishing cover is arranged at the top of the main body frame, the main conductive loop is arranged on one side of the main body frame, the operating mechanism and the auxiliary control box are arranged on the other side of the main body frame, the quick magnetic tripping device is arranged inside the main body frame, a fixed contact is connected onto the main conductive loop, the operating mechanism is connected with a movable contact through a draw bar and used for driving the movable contact to be close to or far away from the fixed contact, the auxiliary control box is connected with the movable contact through a connecting rod and used for displaying the opening and closing states of the movable contact, and the magnetic-blowing.

Preferably, for the direct-current high-breaking magnetic blow fast circuit breaker, the main body frame is composed of a bottom plate, a left side plate, a right side plate, a mechanism plate, a busbar clamping plate and a magnetic blow system base, wherein the operating mechanism and the auxiliary control box are arranged on the mechanism plate, the main conductive loop is arranged between the left side plate and the right side plate, the arc extinguishing cover is arranged on the magnetic blow system base, a lower busbar transversely arranged in the main body frame is fixed in a clamping groove in the busbar clamping plate, a static contact connected with the main conductive loop is arranged on the left side above the lower busbar, the moving contact is hinged to the lower busbar through a pin shaft, and the upper part of the moving contact is hinged to a draw bar of the operating mechanism.

Preferably, for the direct-current high-breaking magnetic blow fast circuit breaker, the magnetic blow system comprises a first excitation structure arranged in a first conductive loop at the early stage of breaking of the moving contact and a second excitation structure arranged in a second conductive loop at the later stage of breaking of the moving contact.

Preferably, for the direct-current high-breaking magnetic blow fast circuit breaker, the arc extinguishing cover comprises an insulating shell arranged on the magnetic blow system base and an arc extinguishing grid plate assembly arranged inside the insulating shell, the first conductive loop and the second conductive loop are both connected with an arc striking angle, and the upper part of the arc striking angle is introduced into the insulating shell.

Preferably, for the direct-current high-breaking magnetic blow-out quick circuit breaker, the main body frame and the insulating shell are both composed of plate-type structural parts with the thickness not exceeding 30 mm.

Preferably, for the direct-current high-breaking magnetic blow fast circuit breaker, an h-shaped isolation plate is arranged between the lower part of the insulating shell and the magnetic blow system base.

Preferably, for the direct-current high-breaking magnetic blow-out fast circuit breaker, the arc-extinguishing grid plate assembly comprises a first arc-extinguishing grid plate assembly and a second arc-extinguishing grid plate assembly which are alternately arranged in the insulating shell, the first arc-extinguishing grid plate assembly and the second arc-extinguishing grid plate assembly are formed by jointly assembling an upper metal grid plate and a lower insulating grid plate, and the height of the upper end of the metal grid plate on the first arc-extinguishing grid plate assembly is lower than that of the upper end of the metal grid plate on the second arc-extinguishing grid plate assembly.

Preferably, for the direct-current high-breaking magnetic blow-out fast circuit breaker, the first conductive loop is composed of a main conductive loop, a fixed contact, a movable contact and a lower busbar, and the first excitation structure is an excitation iron core arranged above the fixed contact.

Preferably, for the direct-current high-breaking magnetic blow fast circuit breaker, the second conductive circuit is composed of an arc striking bar, an excitation spiral bar, a backflow bar and a lower bus bar, wherein the arc striking bar is arranged on the magnetic blow system base and is electrically connected with the main conductive circuit, the excitation spiral bar is connected to the tail end of the arc striking bar, the backflow bar is connected between the excitation spiral bar and the lower bus bar, and the second excitation structure is an iron core arranged in the excitation spiral bar.

Preferably, for the direct-current high-breaking magnetic blow-out quick circuit breaker, the lower busbar, the arc striking bar, the excitation spiral bar and the backflow bar are all conductive structures made of copper materials.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses a direct current quick circuit breaker compact structure, reasonable in design through arc-extinguish chamber function subregion, sets up the magnetic conduction structure in independent confined space, with excitation coil setting at the moving contact rear, has greatly reduced the volume of circuit breaker, makes circuit breaker occupation space little.

2. The circuit breaker adopts primary loop spiral row excitation, when the current direction in the primary loop is reversed, the excitation field can change the direction along with the current direction, the upward magnetic blowing tension is always kept, and unlimited breaking is realized.

3. The direct-current high-breaking magnetic-blast quick breaker generates an excitation magnetic field in a conductive loop of a moving contact at the early stage of breaking and the later stage of breaking through the first excitation structure and the second excitation structure respectively, and generates an arc-drawing acting force on an electric arc of fault current through the magnetic field, so that the electric arc enters the arc-extinguishing cover to extinguish the arc more quickly, and the purpose of quick breaking is achieved.

4. The crisscross structure of metal grid piece height makes electric arc be the slope route between the arc extinguishing grid piece subassembly in the arc extinguishing chamber and jumps, can effectually lengthen electric arc, makes the faster cooling of electric arc, plays more quick arc extinguishing effect.

Drawings

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

FIG. 2 is a schematic view of the split structure of the main frame of the present invention;

figure 3 is a schematic view of the split structure of the arc-extinguishing chamber of the present invention;

fig. 4 is a schematic structural view of the arc-extinguishing grid assembly of the present invention;

FIG. 5 is a schematic structural view of a middle magnetic blowing system according to the present invention;

fig. 6 is a schematic diagram of the conductive circuit of the middle magnetic blow system in the early stage and the later stage of the breaking of the moving contact according to the present invention;

FIG. 7 is a schematic structural view of the medium-speed magnetic release device of the present invention;

FIG. 8 is a schematic structural view of a trip bar of the middle-speed magnetic trip device of the present invention in an aluminum square tube;

fig. 9 is a schematic structural diagram of an auxiliary control box according to the present invention;

fig. 10 is a schematic diagram of the switching-closing display mechanism of the middle auxiliary control box according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1

The utility model provides a technical scheme: a direct-current high-breaking magnetic-blowing quick circuit breaker comprises a main body frame 4, an arc extinguishing cover 1, a main conductive loop 2, a quick magnetic tripping device 3, a magnetic-blowing system 7, an operating mechanism 6 and an auxiliary control box 5, wherein as shown in figure 1, the arc extinguishing cover 1 is arranged at the top of the main body frame 4, the main conductive loop 2 is arranged on one side of the main body frame 4, the operating mechanism 6 and the auxiliary control box 5 are arranged on the other side of the main body frame 4, the quick magnetic tripping device 3 is arranged inside the main body frame 4, a static contact is connected onto the main conductive loop 2, the operating mechanism 6 is connected with a moving contact through a draw bar and used for driving the moving contact to be close to or far away from the static contact, the auxiliary control box 5 is connected with the moving contact through a connecting rod and used for displaying the opening and closing state of the moving contact, and the magnetic-blowing system 7 is an.

As shown in fig. 2, the main body frame 4 is composed of a bottom plate 44, a left side plate 42, a right side plate 45, a mechanism plate 43, a busbar clamp plate 46 and a magnetic blowing system base 41, wherein the operating mechanism 6 and the auxiliary control box 5 are arranged on the mechanism plate 43, the main conductive circuit 2 is arranged between the left side plate 42 and the right side plate 45, the arc extinguishing cover 1 is arranged on the magnetic blowing system base 41, a lower busbar transversely arranged in the main body frame 4 is fixed in a clamping groove on the busbar clamp plate 46, a static contact connected with the main conductive circuit 2 is arranged on the left side above the lower busbar, a moving contact is hinged on the lower busbar through a pin shaft, and the upper part of the moving contact is hinged with a traction rod of the operating mechanism 6.

The magnetic blowing system 7 comprises a first excitation structure arranged in a first conductive loop at the early stage of the breaking of the moving contact and a second excitation structure arranged in a second conductive loop at the later stage of the breaking of the moving contact.

The arc extinguishing chamber 1 comprises an insulating shell arranged on the magnetic blowing system base 41 and an arc extinguishing grid piece assembly arranged inside the insulating shell, arc striking angles are connected to the first conductive loop and the second conductive loop, and the upper portions of the arc striking angles are led into the insulating shell.

The main body frame 4 and the insulating shell are both composed of plate-type structural parts with the thickness not exceeding 30 mm.

An h-shaped isolation plate is arranged between the lower part of the insulating shell and the magnetic blowing system base 41.

The arc-extinguishing grid plate assembly comprises a first arc-extinguishing grid plate assembly and a second arc-extinguishing grid plate assembly which are alternately arranged in the insulating shell, the first arc-extinguishing grid plate assembly and the second arc-extinguishing grid plate assembly are formed by jointly lapping a metal grid plate at the lower part and an insulating grid plate at the upper part, and the height of the upper end of the metal grid plate on the first arc-extinguishing grid plate assembly is lower than that of the upper end of the metal grid plate on the second arc-extinguishing grid plate assembly.

The first conductive loop is composed of a main conductive loop, a fixed contact, a movable contact and a lower busbar, and the first excitation structure is an excitation iron core arranged above the fixed contact.

The second conductive circuit is composed of an arc striking bar, an excitation spiral bar, a backflow bar and a lower bus bar, wherein the arc striking bar is arranged on a magnetic blowing system base and is electrically connected with the main conductive circuit, the excitation spiral bar is connected to the tail end of the arc striking bar, the backflow bar is connected between the excitation spiral bar and the lower bus bar, and the second excitation structure is an iron core arranged in the excitation spiral bar.

The lower busbar, the arc striking bar, the excitation spiral bar and the reflux bar are all conductive structures made of copper materials.

The direct-current quick circuit breaker is characterized in that an excitation structure is respectively arranged in a conductive loop of a moving contact in the early stage and the later stage of breaking, and an upward arc-drawing acting force is generated on an electric arc of fault current in the conductive loop through a magnetic field generated by the excitation structure, so that the electric arc quickly enters an arc extinguishing cover for arc extinguishing.

Example 2

The utility model provides a technical scheme: a direct-current high-breaking magnetic-blowing quick circuit breaker comprises a main body frame 4, an arc extinguishing cover 1, a main conductive loop 2, a quick magnetic tripping device 3, a magnetic-blowing system 7, an operating mechanism 6 and an auxiliary control box 5, wherein as shown in figure 1, the arc extinguishing cover 1 is arranged at the top of the main body frame 4, the main conductive loop 2 is arranged on one side of the main body frame 4, the operating mechanism 6 and the auxiliary control box 5 are arranged on the other side of the main body frame 4, the quick magnetic tripping device 3 is arranged inside the main body frame 4, a static contact is connected onto the main conductive loop 2, the operating mechanism 6 is connected with a moving contact through a draw bar and used for driving the moving contact to be close to or far away from the static contact, the auxiliary control box 5 is connected with the moving contact through a connecting rod and used for displaying the opening and closing state of the moving contact, and the magnetic-blowing system 7 is an.

As shown in fig. 2, the main body frame 4 is composed of a bottom plate 44, a left side plate 42, a right side plate 45, a mechanism plate 43, a busbar clamp plate 46 and a magnetic blowing system base 41, wherein the operating mechanism 6 and the auxiliary control box 5 are arranged on the mechanism plate 43, the main conductive circuit 2 is arranged between the left side plate 42 and the right side plate 45, the arc extinguishing cover 1 is arranged on the magnetic blowing system base 41, a lower busbar transversely arranged in the main body frame 4 is fixed in a clamping groove on the busbar clamp plate 46, a static contact connected with the main conductive circuit 2 is arranged on the left side above the lower busbar, a moving contact is hinged on the lower busbar through a pin shaft, and the upper part of the moving contact is hinged with a traction rod of the operating mechanism 6.

The arc extinguishing cover comprises an insulating shell and an arc extinguishing grid sheet assembly arranged in the insulating shell, as shown in figure 3, the insulating shell is enclosed into a square frame by a left side plate 11, a right side plate 11, a front end plate 18 and a rear end plate 18, h-shaped isolation plates 12 are respectively arranged at the lower parts of the left side plate 11 and the right side plate 11, L-shaped arc striking angles 17 are respectively clamped in clamping grooves at the bottoms of the front end plate 18 and the rear end plate 18, the arc extinguishing grid sheet assembly comprises a first arc extinguishing grid sheet assembly and a second arc extinguishing grid sheet assembly which are alternately arranged, wherein, first arc extinguishing bars piece subassembly is formed by first metal bars piece 14 and first insulating bars piece 13 overlap joint from top to bottom, and second arc extinguishing bars piece subassembly is formed by second metal bars piece 16 and second insulating bars piece 15 overlap joint from top to bottom, and the type of falling U breach has been seted up to the lower part of first insulating bars piece 13, and the lower part of first metal bars piece 14 and second metal bars piece 16 is opened and is all was equipped with type of falling V opening, and the opposite direction of the type of falling V open-ended apex angle orientation of the two.

The arc extinguishing cover guides electric arcs of fault current in a conductive circuit into the arc extinguishing cover through an arc striking angle 17 when a circuit breaker is switched on and off, the electric arcs are conducted between a first metal grid piece 14 of a first arc extinguishing grid piece assembly and a second metal grid piece 16 of a second arc extinguishing grid piece assembly, and arc extinguishing is carried out after the temperature is reduced. The first insulating grid is provided with an inverted U-shaped notch, the second insulating grid is not provided with a notch, the height difference is generated in the longitudinal direction, and the arc can be elongated in the longitudinal direction; the lower parts of the first metal grid sheet and the second metal grid sheet are provided with inverted V-shaped openings, electric arcs enter the metal grid sheet area and contact 1/2 metal grid sheets firstly, and therefore resistance of the electric arcs entering the metal grid sheets can be reduced; keep apart out magnetic conduction functional area and arc extinguishing area through the division board to form narrower passageway at the middle part, be favorable to electric arc to utilize the atmospheric pressure that below high temperature produced to promote electric arc upward movement, the division board has avoided electric arc and magnetic conduction board insulating layer direct contact simultaneously, destroys the magnetic conduction board and insulates, has promoted the security.

As shown in fig. 4, the lap joint of the first insulated gate sheet 13 and the first metal gate sheet 14 and the lap joint of the second insulated gate sheet 15 and the second metal gate sheet 16 form a step structure in an overlapping manner. Specifically, steps are arranged at the lower parts of the first insulating grid sheet 13 and the second insulating grid sheet 15, the upper ends of the first metal grid sheet 14 and the second metal grid sheet 16 are lapped at the steps of the insulating grid sheet above the first metal grid sheet and the second metal grid sheet, and the lower ends of the insulating grid sheets form steps on the surfaces of the metal grid sheets below the first metal grid sheet and the second metal grid sheet. The overall height of the first arc-extinguishing grid plate assembly is the same as that of the second arc-extinguishing grid plate assembly, wherein the height of the first metal grid plate 14 is smaller than that of the second metal grid plate 16, and the height of the first insulating grid plate 13 is larger than that of the second insulating grid plate 15. The structure with different heights ensures that the arc needs to go through an oblique path instead of being conducted in the straight direction perpendicular to the arc-extinguishing grid plate component when jumping from the first arc-extinguishing grid plate component to the second arc-extinguishing grid plate component, so that the arc can be effectively lengthened and the arc can be extinguished more quickly.

As shown in fig. 5, the magnetic blow-out system 7 includes a fixed contact 74, a movable contact 76, a rear arc striking row 712, a front arc striking row 711, an excitation core 73, an excitation spiral row 79, an iron core, a return row 77, a lower row 75 and arc striking angles, the lower row 75 is located at the lowest position, the fixed contact 74 and the excitation spiral row 79 are respectively located at two sides above the lower row 75, the fixed contact 74 and the rear arc striking row 712 are welded to form a fixed contact assembly, the excitation spiral row 79 and the front arc striking row 711 are welded to form a magnetic blow-out assembly, the excitation core 73 is installed above the fixed contact 74, the iron core is installed in the excitation spiral row 79, the excitation spiral row 79 is further connected to the lower row 75 through the return row 77, the movable contact 76 is hinged to the lower row 75 through a pin shaft and can swing towards the fixed contact 74, and the arc striking angles are two and are respectively connected to the rear arc striking.

The above structure constitutes a conductive loop and a magnetic blow structure of fault current in the switching-on and switching-off process of the circuit breaker, specifically, as shown in fig. 6, when the static contact 74 and the moving contact 76 are not separated in the earlier stage of breaking, the flowing direction of the fault current is as follows: the circuit breaker main conductive loop → the fixed contact 74 → the movable contact 76 → the lower busbar 75, at this time, the fault current flows through the fixed contact 74, the excitation iron core 73 above the fixed contact 74 is magnetized to generate an excitation magnetic field, and the magnetic field generates an upward arc pulling acting force on the electric arc of the fault current, so that the electric arc rapidly enters the arc extinguishing chamber to extinguish the arc; when the static contact 74 and the movable contact 76 are completely separated at the later stage of breaking, the flowing direction of the fault current is as follows: the circuit breaker main conductive circuit → the rear arc striking row 712 → the front arc striking row 711 → the excitation spiral row 79 → the return row 77 → the lower busbar 75, at this time, the fault current jumps from the rear arc striking row 712 to the front arc striking row 711, and after flowing to the excitation spiral row 79, the iron core is magnetized, and the generated magnetic field generates an upward arc-drawing acting force on the electric arc of the fault current, so that the electric arc rapidly enters the arc extinguishing chamber to extinguish the arc.

The magnetic blowing system further comprises two T-shaped magnetic conduction plates 710 and two magnetic conduction connecting plates 713, the two T-shaped magnetic conduction plates 710 are arranged at the front end and the rear side in parallel, the transverse plate part of each T-shaped magnetic conduction plate 710 is horizontally arranged on the surfaces of the rear arc striking row 712 and the front arc striking row 711, the vertical plate part is downwards inserted between the static contact 74 and the excitation spiral row 79, and the front end and the rear end of an iron core in the excitation spiral row 79 are respectively connected to the vertical plate parts of the T-shaped magnetic conduction plates 710 at the front side and the rear side through one magnetic conduction connecting plate 713. By the mechanism, the iron core, the magnetic conduction connecting plates 713 at the two ends and the T-shaped magnetic conduction plates 710 respectively connected with the two magnetic conduction connecting plates 713 form a magnetic loop together, and a magnetic field generated by the iron core can be concentrated in an area between the two T-shaped magnetic conduction plates 710, so that stronger arc-drawing acting force is generated on an electric arc of fault current.

As shown in fig. 7, the fast magnetic trip device 3 includes a square frame-shaped magnetic conduction frame 31, a triangular opening is disposed at the middle position of the top of the magnetic conduction frame 31, an aluminum square tube 35 is fixed at the bottom, a triangular magnetic conduction block 32 is disposed in the triangular opening, the aluminum square tube 35 penetrates through the lower portion of the magnetic conduction frame 31 and extends into the magnetic conduction frame 1, a guide block 34 is sleeved on a tube body of the aluminum square tube 31, a trip rod 39 penetrates through the lower end of the aluminum square tube 35, upwardly penetrates through the aluminum square tube 35 and the magnetic conduction block 32 in sequence and extends out from the upper portion of the magnetic conduction block 32, a first nut 312 is disposed at the upper portion of the magnetic conduction block 32 for fastening and connecting the trip rod 39, a first adjusting nut 313, an annular pressing plate 314, a spring 315 and a locking nut 316 are disposed at the upper end of the trip rod from bottom to top in sequence, a flexible washer 311, a butterfly spring group 310, a, The lower part of the aluminum square tube 35 is provided with a strip-shaped groove along the length direction, the left side surface of the magnetic conduction frame 31 is provided with a round hole, and an iron core 317 is inserted in the round hole.

When the tripping device is used, when the current of the main circuit of the direct current circuit breaker does not exceed the limit value of the tripping device, the tripping device does not act, and when the current of the main circuit of the direct current circuit breaker exceeds the limit value of the tripping device, the magnetic conduction block 32 fixed with the tripping rod 39 overcomes the counter force of the disc spring set 310 under the action of electromagnetic force and vertically moves upwards to force the moving contact clamping mechanism of the circuit breaker to open and break the main circuit of the direct current circuit breaker at high speed. The device can determine whether to insert an iron core or not in a round hole on the left side of the magnetic conduction frame according to the overload current tripping adjustment range, when the iron core is inserted, the magnetic conduction frame, the iron core and the magnetic conduction block form a magnetic circuit, the magnetic resistance is reduced, and the magnetic conduction block acts at the overload current I less than 8 kA; when the iron core is not inserted, the magnetic conduction frame and the magnetic conduction block form a magnetic circuit, the magnetic resistance is increased, the magnetic conduction block acts at an overload current I larger than 8kA, 8kA is critical current of the action of the magnetic conduction block, and the specific size of the magnetic conduction block is limited by the compression stroke range of the belleville spring group and the pressure limit force value of the belleville spring group, so that the magnetic conduction frame and the magnetic conduction block can be adjusted as required.

The magnetic conduction frame 1 is formed by overlapping a plurality of silicon steel sheets with the thickness of 0.5mm and is tightly riveted, and the magnetic conduction frame 31 is provided with a mounting hole which is convenient for mounting the magnetic conduction frame on the circuit breaker.

The magnetic conduction block 32 is formed by overlapping a plurality of silicon steel sheets with the thickness of 0.5mm and is tightly riveted, a vertical downward guide shaft 33 is arranged at the lower part of the magnetic conduction block 32, the guide shaft 33 is inserted into a guide groove arranged at the top of the guide block, and the guide shaft 33 slides in the guide groove of the guide block 34, so that the motion track of the magnetic conduction block 32 is limited, the vertical up-and-down motion of the magnetic conduction block 32 is facilitated, the offset is not generated, and the accuracy of the tripping action is ensured.

The lower part of the aluminum square tube 35 is marked with scale lines and readings along the groove edge of the strip-shaped groove.

The limit value of the main circuit overload current is calculated according to the Lorentz magnetic force required by the magnetic conduction block 32 to overcome the counterforce of the disc spring set 310, so that the elastic force (namely, the compression state) of the disc spring set 310 determines the limit value of the overload current (namely, the threshold value of the device for executing tripping action), in the device, the compression state of the disc spring set 310 can be adjusted by adjusting the up-and-down position of the second adjusting nut 37, so that the limit value of the overload current in the main circuit can be correspondingly adjusted, the indicating ring 36 is pressed together with the second adjusting nut 37, so that the indicating ring 36 synchronously moves up and down along with the adjustment of the second adjusting nut 37, the indicating ring 36 can be seen at the strip-shaped groove on the aluminum square tube 35, the corresponding overload current limit value correspondingly converted according to the pressure of the disc spring set 310 is marked on the groove edge of the strip-shaped groove, therefore, after adjustment, the limit value of the overload current of the adjusted main circuit can be directly read through the scale mark corresponding to the indicating ring 36.

As shown in fig. 9, the auxiliary operating box 5 includes a housing 52, a push rod 51, an observation window 53, an opening and closing display mechanism and an aviation socket 54, the observation window 53 and the aviation socket 54 are vertically arranged on the front surface of the housing 52, the push rod 51 is arranged on the back side of the housing 52, the opening and closing display mechanism is arranged inside the housing 52, two ends of the push rod 51 are respectively connected with the opening and closing display mechanism and a moving contact 55 of the fast breaker, the push rod 51 extends and retracts following the opening and closing actions of the moving contact 55 to drive the opening and closing display mechanism to operate, so as to make an opening and closing position indication, and output an opening and closing feedback signal through the aviation socket 54.

As shown in fig. 10, the switching display mechanism includes a lever 56, an indication board 57, a first spring 510, a second spring 512, an auxiliary switch 511, a switching stop 58 and a switching stop 59, wherein one end of the lever 56 and the middle of the indication board 57 are provided with a rotating shaft capable of rotating around the lever, the rotating shafts of the lever and the indication board 57 are located on the same axis, the rotating shaft of the lever 56 is provided with a connecting rod perpendicular to the lever 56, one end of the connecting rod is connected with the push rod 51, the other end of the connecting rod is pulled by the fixed second spring 512, the other end of the lever 56 away from the rotating shaft is provided with an open slot, the open slot bites the tail end of the indication board 57 to toggle the indication board 57, one end of the first spring 510 is connected with the tail end of the indication board 57, the other end of the first spring is fixed, the fixed point is located on the axis where the rotating shafts of the lever 56 and the indication board 57 are located, the auxiliary switch 511 is provided at the side of the link.

The opening stop 58 and the closing stop 59 are located at upper and lower positions inside the observation window 53.

The indication board 57 has an arrow-shaped structure, and both sides of the front end thereof are respectively provided with a switching-off indication mark and a switching-on indication mark.

The auxiliary switch 511 has two contacts, which are connected to the aviation socket 54 in the same power circuit, and the two contacts respectively correspond to the opening signal feedback circuit and the closing signal feedback circuit of the aviation switch.

The process that the switching-on and switching-off display mechanism sends switching-on and switching-off indication specifically is as follows: when the moving contact 55 is switched on, the ejector rod 51 acts along with the moving contact to push the crank arm 56 to rotate anticlockwise around a rotating shaft, an open slot of the crank arm 56 stirs the tail end of the indicator 57, the indicator 57 rotates clockwise around the rotating shaft of the indicator 57, the front end of the indicator 57 deviates until the indicator is limited by the switching-on stop gear 59 and stops, at the moment, the switching-on indication mark can be seen through the observation window 53, in the process, a connecting rod originally pressed on the rotating shaft of the crank arm on the auxiliary switch is separated from the connecting rod, the contact of the auxiliary switch is released and converted, so that a switching-on signal feedback loop of the aviation socket is switched; when the moving contact 55 is opened, the ejector rod 51 acts therewith to pull the crank arm 56, meanwhile, the second spring 512 provides counter force to enable the crank arm 56 to rotate clockwise around a rotating shaft of the crank arm 56, an open slot of the crank arm 56 pokes the tail end of the indicator 57, the indicator rotates anticlockwise around the rotating shaft of the indicator, the front end of the indicator 57 deviates until being limited by the opening stop gear 58 and stops, at the moment, the opening indication mark can be seen through the observation window 53, in the process, a connecting rod on the rotating shaft of the crank arm 56 can also compress the auxiliary switch 511 beside the crank arm to enable the contact of the auxiliary switch 511 to be switched, so that the opening signal feedback loop of the aviation socket 54 is switched on, and an opening signal is fed back (please supplement the process of feeding back the opening.

In the initial state, the crank arm 56 and the indicator 57 are both positioned on the same axis, and at the moment, the tail end of the indicator 57 is freely suspended in the open slot of the crank arm 56 and is not contacted with the open slot. The device does not need to be precisely adjusted in size during installation, is not affected by abrasion of parts and overlarge fit clearance, and can ensure the accuracy of opening and closing position indication.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. The direct-current high-breaking magnetic-blowing quick circuit breaker is characterized in that the arc extinguishing cover is arranged at the top of the main body frame, the main conductive loop is arranged on one side of the main body frame, the operating mechanism and the auxiliary control box are arranged on the other side of the main body frame, the quick magnetic-releasing device is arranged inside the main body frame, a fixed contact is connected to the main conductive loop, the operating mechanism is connected with a movable contact through a draw bar and used for driving the movable contact to be close to or far away from the fixed contact, the auxiliary control box is connected with the movable contact through a connecting rod and used for displaying the opening and closing state of the movable contact, and the magnetic-blowing system is an excitation structure arranged among the fixed contact, the movable contact and the arc extinguishing cover.

2. The direct-current high-breaking magnetic-blowing quick circuit breaker according to claim 1, wherein the main body frame is composed of a bottom plate, a left side plate, a right side plate, a mechanism plate, a busbar clamping plate and a magnetic-blowing system base, wherein the operating mechanism and the auxiliary control box are arranged on the mechanism plate, the main conductive circuit is arranged between the left side plate and the right side plate, the arc extinguishing cover is arranged on the magnetic-blowing system base, a lower busbar transversely arranged in the main body frame is fixed in a clamping groove on the busbar clamping plate, a static contact connected with the main conductive circuit is arranged on the left side above the lower busbar, the movable contact is hinged on the lower busbar through a pin shaft, and the upper part of the movable contact is hinged with a draw bar of the operating mechanism.

3. The direct-current high-breaking magnetic blow quick circuit breaker according to claim 2, wherein the magnetic blow system comprises a first excitation structure arranged in a first conductive loop at the early stage of breaking of the moving contact and a second excitation structure arranged in a second conductive loop at the later stage of breaking of the moving contact.

4. The direct-current high-breaking magnetic-blast fast circuit breaker according to claim 3, wherein the arc-extinguishing chamber comprises an insulating housing provided on the base of the magnetic-blast system and an arc-extinguishing grid assembly provided inside the insulating housing, the first conductive loop and the second conductive loop are connected with an arc-striking angle, and the upper portion of the arc-striking angle is inserted into the insulating housing.

5. The direct-current high-breaking magnetic blow quick breaker according to claim 4, wherein the main body frame and the insulating housing are each composed of a plate-type structural part having a thickness of not more than 30 mm.

6. The direct-current high-breaking magnetic blow quick breaker according to claim 4, wherein an "h" shaped isolation plate is arranged between the lower part of the insulation shell and the magnetic blow system base.

7. The direct current high breaking magnetic blow fast breaker according to claim 4, wherein the arc chute assembly comprises a first arc chute assembly and a second arc chute assembly arranged alternately inside the insulating housing, both are assembled by a lower metal chute and an upper insulating chute, and the height of the upper end of the metal chute on the first arc chute assembly is lower than that of the upper end of the metal chute on the second arc chute assembly.

8. The direct-current high-breaking magnetic blow quick breaker according to claim 4, wherein the first conductive loop is composed of a main conductive loop, a fixed contact, a movable contact and a lower busbar, and the first excitation structure is an excitation iron core installed above the fixed contact.

9. The direct-current high-breaking magnetic-blowing quick circuit breaker according to claim 4, wherein the second conductive circuit is composed of an arc striking bar, an excitation spiral bar, a return bar and a lower bus bar, wherein the arc striking bar is arranged on the magnetic-blowing system base and is electrically connected with the main conductive circuit, the excitation spiral bar is connected to the tail end of the arc striking bar, the return bar is connected between the excitation spiral bar and the lower bus bar, and the second excitation structure is an iron core installed in the excitation spiral bar.

10. The direct-current high-breaking magnetic blow quick circuit breaker according to claim 8 or 9, wherein the lower busbar, the arc striking bar, the excitation spiral bar and the return bar are all conductive structures made of copper materials.

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