Molded case circuit breaker

Abstract

A molded case circuit breaker comprises a shell and a phase pole unit arranged in the shell, an operating mechanism and a rotating shaft system are arranged in the shell, the phase pole unit at least comprises a moving contact, a static contact, a release, an arc extinguishing system and two wiring terminals connected with the moving contact and the static contact respectively, the arc extinguishing system comprises a plurality of arc extinguishing grid pieces, and the arc extinguishing grid pieces are connected with the operating mechanism and the rotating shaft system respectively. The arc extinguishing system comprises two side arc extinguishing structures and a first arc extinguishing structure arranged between the two side arc extinguishing structures, the first arc extinguishing structure comprises a plurality of first grid pieces serving as arc extinguishing grid pieces, and the plurality of first grid pieces are arranged in parallel with the first direction. The arc extinguishing grid sheets of the two side arc extinguishing structures are arranged in an oblique angle or a right angle with the first direction, a protruding separation structure is arranged between the first arc extinguishing structure and at least one side arc extinguishing structure, the separation structure can play a blocking role firstly, an arc is extinguished through the first arc extinguishing structure firstly, then the arc cutting role is played, and the arc extinguishing effect is achieved. And arc extinguishing of the first arc extinguishing structure and the side arc extinguishing structure is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of low voltage electrical apparatus, concretely relates to a molded case circuit breaker. BACKGROUND

[0002] With the continuous development of power distribution technology, the performance requirements of the molded case circuit breaker of the power distribution system are also higher and higher, under the condition that the voltage grade of the molded case circuit breaker is continuously improved, the molded case circuit breaker product is continuously developed in the direction of small volume and high performance. As the core component in the molded case circuit breaker, the performance of the arc extinguishing chamber plays a decisive role in the breaking capacity and service life of the circuit breaker. The traditional arc extinguishing chamber grid piece arrangement is single, the arc extinguishing capacity is proportional to the number, depth and cross section area of the grid piece, the arc lengthening is limited, the limited arc extinguishing capacity is not conducive to high voltage breaking, therefore, a novel structure arc extinguishing chamber is urgently needed to solve the above technical problems. SUMMARY

[0003] The utility model aims at overcoming at least one defect of prior art, providing a molded case circuit breaker.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A molded case circuit breaker, comprising a shell and a phase pole unit arranged in the shell, wherein the shell is provided with an operating mechanism and a rotating shaft system, the phase pole unit at least comprises a movable contact, a static contact, a release and an arc extinguishing system, and two wire terminals connected with the movable contact and the static contact respectively, the arc extinguishing system comprises a plurality of arc extinguishing grid pieces, the arc extinguishing system comprises two side arc extinguishing structures and a first arc extinguishing structure arranged between the two side arc extinguishing structures, the first arc extinguishing structure comprises a plurality of first grid pieces as arc extinguishing grid pieces, the plurality of first grid pieces are arranged in parallel with a first direction, the arc extinguishing grid pieces of the two side arc extinguishing structures are arranged at an oblique angle or a right angle with the first direction, and a protruding separation structure is arranged between the first arc extinguishing structure and at least one side arc extinguishing structure.

[0006] Preferably, the two side arc extinguishing structures each comprise a plurality of second grid pieces as arc extinguishing grid pieces, the plurality of second grid pieces are arranged in parallel with a second direction, and the included angle between the first direction and the second direction ranges from 70 to 90 degrees.

[0007] Preferably, the first direction is the height direction of the molded case circuit breaker, the second direction is the length direction of the molded case circuit breaker, and the first direction is perpendicular to the second direction.

[0008] Preferably, the two side arc-extinguishing structures are respectively a second arc-extinguishing structure and a third arc-extinguishing structure, the second arc-extinguishing structure is located below the static contact, and the third arc-extinguishing structure is located below the dynamic contact in the open position, the second arc-extinguishing structure comprises a plurality of second fins arranged in parallel with the second direction, the included angle between the first direction and the second direction ranges from 70 to 90 degrees, the third arc-extinguishing structure comprises a plurality of third fins as arc-extinguishing fins, two adjacent third fins are away from one end of the dynamic contact and respectively inclined to one side away from the first arc-extinguishing structure, so that the distance between the two adjacent third fins close to the one end of the dynamic contact is smaller than the distance between the two third fins away from the one end of the dynamic contact, and the included angle between the third fin and the first fin ranges from 1 to 90 degrees.

[0009] Preferably, the included angle between the third fin closest to the first arc-extinguishing structure in the third arc-extinguishing structure and the first fin is less than or equal to 1 degree; and / or, the third fin farthest from the first arc-extinguishing structure in the third arc-extinguishing structure is arranged in parallel with the second fin.

[0010] Preferably, the distances of the plurality of second fins to the first arc-extinguishing structure gradually increase in the direction close to the static contact, so that an arc-extinguishing groove is formed between the plurality of second fins and the first arc-extinguishing structure, and the width of the arc-extinguishing groove close to the static contact is greater than the width of the arc-extinguishing groove away from the static contact.

[0011] Preferably, the separation structure comprises a separation fin, the separation fin comprises a first separation section, a second separation section and a third separation section, the two ends of the second separation section are bent and connected with the first separation section and the third separation section and are arranged in an inclined manner, the first separation section is arranged on the side of the second separation section close to the first arc-extinguishing structure, and the third separation section is located between the corresponding side arc-extinguishing structure and the bottom of the shell.

[0012] Preferably, the separation fin is provided with a separation through hole, and the two ends of the separation through hole are respectively located on the first separation section and the third separation section.

[0013] Preferably, the side edge of one end of the first separation section forms a first separation surface, the side edge of one end of the third separation section forms a second separation surface, the first separation surface is provided with a second notch, the bottom of the second notch is arranged in a staggered manner with the bottom of the notch of the adjacent arc-extinguishing fin, and the second separation surface is provided with a third notch, and the bottom of the third notch is arranged in a staggered manner with the bottom of the notch of the adjacent arc-extinguishing fin.

[0014] Preferably, the first separation section is arranged in parallel with the first direction, and the second separation section is arranged at an oblique angle with the first separation section.

[0015] Preferably, one of the two terminal is arranged above the third arc-extinguishing structure and connected with the moving contact, and a moving arc-inducing sheet is arranged between the terminal and the third arc-extinguishing structure, the moving arc-inducing sheet comprises a connecting portion connected with the terminal and an arc-inducing portion located at the side of the third arc-extinguishing structure away from the first arc-extinguishing structure, and the connecting portion and the arc-inducing portion are connected through a supporting portion which extends through the narrow gap to the side of the third arc-extinguishing structure away from the first arc-extinguishing structure.

[0016] Preferably, the arc-extinguishing system further comprises two oppositely arranged gas-generating plates, and a narrow gap for avoiding the moving contact is arranged between the two gas-generating plates, the gas-generating plate comprises a gas-generating side plate and a gas-generating boss located between the gas-generating side plate and the corresponding fixed plate, the gas-generating boss is connected with the corresponding fixed plate, and the gas-generating side plate is arranged in a spaced manner with the fixed plate, and each arc-extinguishing sheet is provided with two insertion legs, and the two insertion legs of the arc-extinguishing sheet are respectively inserted between the gas-generating side plate and the corresponding fixed plate.

[0017] Preferably, the separation structure comprises a separation sheet, the middle portion of the separation sheet is provided with a separation through hole, the separation structure is respectively provided with a third separation portion at both sides of the separation through hole close to the two side fixed plates, the gas-generating side plate comprises an insertion portion arranged correspondingly with the separation structure, the insertion portion is used for being inserted into the separation through hole, and the two third separation portions are respectively located between the two insertion portions and the corresponding fixed plates.

[0018] Preferably, the length of the insertion leg of the first sheet is greater than the length of the insertion leg of the arc-extinguishing sheet of the side arc-extinguishing structure, and the gas-generating boss is provided with a gas-generating insertion slot for inserting the insertion leg of the first sheet.

[0019] Preferably, the gas-generating plate further comprises a gas-generating top plate and a protruding structure protruding upward, one of the side arc-extinguishing structures is arranged below the stationary contact in a corresponding manner, and a stationary arc-inducing plate is arranged between the side arc-extinguishing structure and the stationary contact, the gas-generating top plate is located between the side arc-extinguishing structure and the stationary arc-inducing plate and is used for limiting the stationary arc-inducing plate.

[0020] Preferably, the arc-extinguishing sheet is provided with a notch recessed to the middle portion of the arc-extinguishing sheet, the recessed directions of the notches of the two adjacent arc-extinguishing sheets are arranged in an oblique angle, and the bottoms of the notches of the two adjacent arc-extinguishing sheets are arranged in a staggered manner.

[0021] Preferably, the shell comprises a lower shell and an upper shell, the upper shell is provided with an operating mechanism and a rotating shaft system in the upper shell, and the two terminals, the moving contact, the stationary contact and the release are arranged in the upper shell, the arc-extinguishing system is arranged in the lower shell, and the lower shell is respectively provided with exhaust ports at both ends of the arc-extinguishing system in a corresponding manner.

[0022] Preferably, the two wiring terminals of the phase pole unit are arranged at two ends of the upper shell, the moving contact, the static contact and the release of the phase pole unit are arranged between the two wiring terminals, the moving contact and the static contact are arranged at the middle part of the phase pole unit, the release is arranged at the side of the static contact away from the moving contact, the rotating shaft system crosses the plurality of phase pole units and is correspondingly arranged above the moving contact, the operating mechanism is arranged above one of the phase pole units and is used to drive the rotating shaft system to rotate, when the release triggers the operating mechanism to trip, the operating mechanism drives the rotating shaft system to rotate, and the rotating shaft system drives the moving contact and the static contact of all the phase pole units to separate.

[0023] Preferably, the third louver farthest from the first arc extinguishing structure in the third arc extinguishing structure is provided with a bending portion, and the bending portion is bent towards the adjacent third louver.

[0024] Preferably, the bending portion comprises a first bending segment, a second bending segment and a third bending segment, the first bending segment is connected between the third louver and the second bending segment, the third bending segment is connected to one end of the second bending segment away from the first bending segment, the third bending segment and the second bending segment are arranged in a V shape, the second bending segment is bent towards the adjacent third louver, and the third bending segment is bent towards the moving contact in the open position, the third bending segment and the second bending segment are respectively provided with louver through holes, and the louver through hole on the third bending segment is in communication with the louver through hole on the second bending segment.

[0025] Preferably, the third louver and the separation structure are of the same structure.

[0026] The molded case circuit breaker has the advantages that the first arc extinguishing structure can not only play an arc extinguishing role, but also play an arc separation role, so that the separated arc enters the two side arc extinguishing structures on the two sides; in addition, the first arc extinguishing structure and the two side arc extinguishing structures form three regions for arc extinguishing, when the moving contact is just opened and the angle of the moving contact does not sweep the separation structure, the separation structure can play a blocking role, so that the arc contacts the first arc extinguishing structure as much as possible and the arc is extinguished by the first arc extinguishing structure; when the moving contact continues to open and sweeps the separation structure, the separation structure can not only play a role in cutting the arc into two parts, so as to facilitate arc extinguishing by the first arc extinguishing structure and the side arc extinguishing structure, but also guide the arc to quickly enter the side arc extinguishing structure at the end.

[0027] In addition, the gas production plate produces a large amount of gas under the high-temperature arc erosion, which helps to cool the arc; meanwhile, the large amount of gas increases the internal pressure of the arc extinguishing chamber, and the pressure difference between the pressure and the atmospheric pressure outside the shell can drive the arc to quickly enter the arc extinguishing chamber louver, so as to achieve the effects of arc cutting and cooling.

[0028] In addition, the first partition section can realize arc isolation effect, the first partition surface and the second partition surface can realize cutting arc effect, and the second gap and the third gap can reduce resistance to the arc. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structural schematic view of the molded case circuit breaker in the second embodiment of the utility model;

[0030] Figure 2 is a sectional view of the arc extinguishing system in the first embodiment of the utility model;

[0031] Figure 3 is a structural schematic view of the arc extinguishing system in the first embodiment of the utility model;

[0032] Figure 4 is a structural schematic view of the gas production plate in the first embodiment of the utility model;

[0033] Figure 5 is a sectional view of the arc extinguishing system in the second embodiment of the utility model;

[0034] Figure 6 is a structural schematic view of the arc extinguishing system in the second embodiment of the utility model;

[0035] Figure 7 is a structural schematic view of the gas production plate in the second embodiment of the utility model;

[0036] Figure 8 is a structural schematic view of the arc extinguishing grid in the utility model;

[0037] Figure 9 is a structural schematic view of the partition grid in the utility model;

[0038] Figure 10 is a cooperation schematic view of the partition grid and the gas production plate in the utility model;

[0039] Figure 11 is a sectional view of the arc extinguishing system in the third embodiment of the utility model;

[0040] Figure 12 is a structural schematic view of the third grid in the third embodiment of the utility model;

[0041] In the drawings:

[0042] 2 arc extinguishing grid 114 support portion

[0043] 3 fixed plate 121 static arc striking plate

[0044] 4 gas production plate 151 exhaust port

[0045] 11 movable contact 152 arc isolation mesh plate

[0046] 12 stationary contact 201 mounting boss

[0047] 13 release 202 notch

[0048] 14 terminal 203 insertion leg

[0049] 15 lower shell 204 bent portion

[0050] 16 upper shell 211 first grid piece

[0051] 17 operating mechanism 221 second grid piece

[0052] 18 rotating shaft system 231 third grid piece

[0053] 20 side arc extinguishing structure 240 separation grid piece

[0054] 21 first arc extinguishing structure 241 first separation section

[0055] 22 second arc extinguishing structure 242 second separation section

[0056] 23 third arc extinguishing structure 243 third separation section

[0057] 24 separation structure 245 second boss

[0058] 40 narrow slit 246 separation through hole

[0059] 41 gas production side plate 247 third separation portion

[0060] 42 gas production boss 281 first separation surface

[0061] 43 connecting hole 282 second notch

[0062] 44 gas production slot 291 second separation surface

[0063] 45 gas production top plate 2041 first bent section

[0064] 46 protruding structure 2042 second bent section

[0065] 47 insertion portion 2043 third bent section

[0066] 111 moving arc drawing piece 2044 grid piece through hole

[0067] 112 connecting portion 292 third notch

[0068] 113 arc drawing portion DETAILED DESCRIPTION

[0069] The following embodiments of the plastic shell circuit breaker of the present application are further illustrated with reference to the accompanying drawings. The plastic shell circuit breaker of the present application is not limited to the following embodiments.

[0070] As shown in Figure 1 the present embodiment, the plastic shell circuit breaker comprises a housing and two phase pole units arranged side by side in the housing. The circuit breaker can also be single-pole, three-pole or four-pole in other embodiments, corresponding to a single, three or four phase pole units. The phase pole unit at least comprises a moving contact 11, a stationary contact 12, a tripping device 13 and an arc extinguishing system, and two terminal blocks 14 connected with the moving contact 11 and the stationary contact 12 respectively. Preferably, the housing comprises a lower shell 15 and an upper shell 16, the upper shell 16 is provided with an operating mechanism 17 and a rotating shaft system 18, and the two terminal blocks 14, the moving contact 11, the stationary contact 12 and the tripping device 13 are all arranged in the upper shell 16, the arc extinguishing system is arranged in the lower shell 15, and the arc extinguishing system comprises a plurality of arc extinguishing vanes 2 for cutting and quickly extinguishing the electric arc. The lower shell 15 is integrally formed for mounting the arc extinguishing system, and the upper shell 16 can be spliced together and comprises a cover plate at the top to facilitate assembly.

[0071] As shown in Figures 2-3 the present embodiment, an improvement point of the present embodiment is that the arc extinguishing system comprises two side arc extinguishing structures 20 and a first arc extinguishing structure 21 arranged between the two side arc extinguishing structures 20, the first arc extinguishing structure 21 comprises a plurality of first vanes 211 as arc extinguishing vanes 2, and the plurality of first vanes 211 are all arranged in parallel with the first direction, the arc extinguishing vanes of the two side arc extinguishing structures 20 are arranged at an oblique angle or a right angle with the first direction, and a raised separation structure 24 is arranged between the first arc extinguishing structure 21 and at least one side arc extinguishing structure 20.

[0072] The plastic shell circuit breaker of the present embodiment performs arc extinguishing in three areas composed of the first arc extinguishing structure 21 and the two side arc extinguishing structures 20, the first arc extinguishing structure 21 not only plays an arc extinguishing role, but also plays a separation arc role, so that the separated arcs enter the two side arc extinguishing structures 20 on the left and right sides. In addition, when the moving contact 11 is just opened and the angle of the moving contact 11 does not sweep the separation structure 24, the separation structure 24 can play a blocking role, so that the arc contacts the first arc extinguishing structure 21 as much as possible and the arc is extinguished by the first arc extinguishing structure 21 first; when the moving contact 11 continues to open and sweeps the separation structure 24, the separation structure 24 not only plays a role of cutting the arc into left and right parts, but also guides the arc to quickly enter the side arc extinguishing structure at the end, facilitating arc extinguishing by the first arc extinguishing structure 21 and the side arc extinguishing structure 20. The arc extinguishing vanes of the side arc extinguishing structure 20 are arranged at an oblique angle with the first direction, so that they are arranged at an acute angle, rather than parallel or perpendicular.

[0073] Further, the arc extinguishing system comprises two fixed plates 3 arranged oppositely, and two gas generating plates 4 arranged between the two fixed plates 3, the arc extinguishing grid 2 is provided with a mounting boss 201 for mounting to the fixed plate 3 Figure 8 , the two gas generating plates 4 correspond to the two fixed plates 3 respectively, a narrow gap 40 for avoiding the moving contact 11 is arranged between the two gas generating plates 4, the side edge of the arc extinguishing grid 2 close to the narrow gap 40 is provided with a notch 202 recessed to the middle part of the arc extinguishing grid 2, the recessed directions of the notches 202 of the two adjacent arc extinguishing grids 2 are arranged at an oblique angle, the bottoms of the notches 202 of the two adjacent arc extinguishing grids 2 are arranged in a staggered manner, which reduces the resistance of the arc entering the arc extinguishing grid 2 after the arc is generated, and reduces the arc extinguishing time, the lower shell 15 is provided with an exhaust port 151 at the two ends of the arc extinguishing system respectively, and an arc blocking net plate 152 for intercepting the arc is arranged in the exhaust port 151. The gas generating plate 4 generates a large amount of gas under the high temperature erosion of the arc, which helps to cool the arc; at the same time, the large amount of gas makes the internal pressure of the arc extinguishing chamber increase, and the pressure difference between the pressure and the atmospheric pressure outside the shell can drive the arc to quickly enter the arc extinguishing chamber grid, so as to achieve the effect of arc cutting and cooling. The distance between the two gas generating plates 4 is smaller, the easier to drive the arc, and the more obvious the effect under the condition of allowing.

[0074] It can be understood that the arc extinguishing system can also not be provided with the fixed plate 3, the arc extinguishing grid 2 can also be directly mounted in the lower shell 15, and the gas generating plate 4 can also be directly mounted with the lower shell 15, all of which belong to the protection scope of the utility model.

[0075] As shown in Figure 1 , the two wiring terminals of the phase electrode unit are arranged oppositely at the two ends of the upper shell 16, the moving contact 11, the static contact 12 and the release 13 of the phase electrode unit are arranged between the two wiring terminals, the moving contact 11 and the static contact 12 are arranged at the middle part of the phase electrode unit, the release 13 is arranged on the side surface of the static contact 12 away from the moving contact 11, the rotating shaft system 18 crosses the plurality of phase electrode units and is arranged above the moving contact 11 correspondingly, the operating mechanism 17 is arranged above one of the phase electrode units and is used to drive the rotating shaft system 18 to rotate, when the circuit in which the release 13 is arranged fails, the release 13 is used to trigger the operating mechanism 17 to trip, so that the operating mechanism 17 drives the rotating shaft system 18 to rotate, and the rotating shaft system 18 drives the moving contact 11 of all the phase electrode units to separate from the static contact 12; one end of the moving contact 11 is arranged on the rotating shaft system 18, and the end of the moving contact 11 away from the rotating shaft system 18 is inserted into the arc extinguishing system, the operating mechanism 17 is provided with a handle, the handle drives the rotating shaft system 18 to rotate through the operating mechanism 17, and the rotating shaft system 18 drives the moving contact 11 and the static contact 12 of all the phase electrode units to contact and separate when rotating, and the protruding structure 46 arranged in the first arc extinguishing part 61 and extending into the upper shell 16 can make the first arc extinguishing part 61 closer to the moving contact and the static contact.

[0076] As Figures 2-4 The first embodiment of the arc extinguishing system is shown, the two side arc extinguishing structures 20 each include a plurality of second grid pieces 221 as arc extinguishing grid pieces 2, the plurality of second grid pieces 221 are each arranged parallel to the second direction, the first direction is arranged at a right angle to the second direction. Of course, the first direction and the second direction can also be arranged at an oblique angle. Preferably, the included angle between the first direction and the second direction ranges from 70 to 90 degrees, both perpendicular or close to perpendicular. For example, the first grid piece 211 of the first arc extinguishing structure 21 can be arranged slightly inclined at an acute angle to the vertical direction, preferably the angle between the first grid piece 211 and the vertical direction is 0 to 20 degrees. For example, the second grid piece 221 of the side arc extinguishing structure 20 is arranged inclined at an acute angle to the horizontal direction, preferably the angle between the second grid piece 221 and the horizontal direction is 0 to 20 degrees. In this embodiment, the first direction is the height direction of the molded case circuit breaker, that is Figure 1 , Figure 2 the vertical direction in the above formula, the second direction is the length direction of the molded case circuit breaker, that is Figure 1 , Figure 2 the horizontal direction in the above formula, the first direction and the second direction are perpendicular.

[0077] Further, the plurality of second grid pieces 221 of the side arc extinguishing structure 20 are arranged in a stepped shape, the distance of the plurality of second grid pieces 221 to the first arc extinguishing structure 21 gradually increases in the direction close to the stationary contact 12, so that the plurality of second grid pieces 221 of the side arc extinguishing structure 20 and the first arc extinguishing structure 21 form an arc extinguishing groove, the width of the arc extinguishing groove close to the stationary contact 12 end is greater than the width of the arc extinguishing groove away from the stationary contact 12 end.

[0078] Further, this embodiment includes two of the partition structures 24, the partition structure 24 includes a partition grid piece 240, the partition grid piece 240 includes a first partition section 241, a second partition section 242 and a third partition section 243, both ends of the second partition section 242 are bent and connected with the first partition section 241 and the third partition section 243 and are arranged inclined, the first partition section 241 is arranged on the side of the second partition section 242 close to the first arc extinguishing structure 21, and the first partition section 241 is arranged parallel to the first direction, the third partition section 243 is located between the corresponding side arc extinguishing structure 20 and the bottom of the housing, and the third partition section 243 is arranged parallel to the second direction first partition section 241 second partition section 242.

[0079] As Figures 3-4As shown, the gas production plate 4 of the embodiment includes a gas production side plate 41, and a gas production boss 42 between the gas production side plate 41 and the corresponding fixed plate 3, the gas production boss 42 is provided with a connecting hole 43 connected with the corresponding fixed plate 3 by a screw, the gas production side plate 41 and the corresponding fixed plate 3 are spaced apart, and each of the arc extinguishing grid plates 2 is provided with two insertion legs 203, and the two insertion legs 203 of each arc extinguishing grid plate 2 are respectively inserted between the gas production side plate 41 and the corresponding fixed plate 3.

[0080] Further, the length of the insertion leg 203 of the first grid plate 211 is greater than the length of the insertion leg 203 of the other arc extinguishing grid plates 2, and the gas production boss 42 is provided with a gas production slot 44 for inserting the insertion leg 203 of the first grid plate 211.

[0081] Further, the gas production plate 4 further includes a gas production top plate 45 and a protruding structure 46 protruding upward into the upper shell 16, the protruding structure 46 is located below the static contact 12 and the rotating shaft system 18, one side arc extinguishing structure 20 is arranged below the static contact 12, and a static arc guiding plate 121 is arranged between the side arc extinguishing structure 20 and the static contact 12, the gas production top plate 45 is located between the side arc extinguishing structure 20 and the static arc guiding plate 121, and is used for limiting the static arc guiding plate 121.

[0082] As shown, Figure 9 The second boss 245 of the partition grid plate 240 is arranged on the two side edges of the two side fixed plates 3, and the two second bosses 245 are inserted into the two fixed plates 3 for limiting cooperation, the middle part of the partition grid plate 240 is provided with a partition through hole 246, the two sides of the partition through hole 246 of the partition grid plate 240 are respectively provided with a third partition part 247, the two ends of the partition through hole 246 are respectively located on the first partition section 241 and the third partition section 243, the side edge of one end of the partition through hole 246 on the first partition section 241 constitutes a first partition surface 281, the side edge of one end of the partition through hole 246 on the third partition section 243 constitutes a second partition surface 291, the first partition surface 281 is provided with a second notch 282, the bottom of the second notch 282 is arranged in a staggered manner with the bottom of the notch 202 of the adjacent arc extinguishing grid plate 2, the second partition surface is provided with a third notch 292, the bottom of the third notch 292 is arranged in a staggered manner with the bottom of the notch 202 of the adjacent arc extinguishing grid plate 2, the first partition section 241 can realize the isolation of the arc effect, the first partition surface 281 and the second partition surface 291 can realize the cutting of the arc effect, and the second notch 282 and the third notch 292 can reduce the resistance to the arc.

[0083] Further, the gas production side plate 41 comprises an insertion part 47 corresponding to the partition structure 24, which is used to be inserted into the partition hole 246 of the partition grid 240, and two third partition parts 247 on the partition grid 240 are respectively located between the two insertion parts 47 and the corresponding fixed plate 3. In this embodiment, two partition structures 24 are provided, and two insertion parts 47 are correspondingly provided. As shown in Figure 7 The gas production plate 4 of the second embodiment is shown, and the second embodiment only provides one partition structure 24, and one insertion part 47 is correspondingly provided.

[0084] As shown in Figures 5-7 The second embodiment of the arc extinguishing system is shown, and the two side arc extinguishing structures 20 are respectively a second arc extinguishing structure 22 and a third arc extinguishing structure 23, wherein the second arc extinguishing structure 22 is located below the static contact 12, and the third arc extinguishing structure 23 is located below the dynamic contact 11 in the open position. In this embodiment, the first grid 211 of the first arc extinguishing structure 21 is slightly inclined, and the angle between the first grid 211 and the vertical direction is preferably 0 to 20 degrees. The second arc extinguishing structure 22 comprises a plurality of second grids 221 arranged in parallel to the second direction, and the second direction is horizontally arranged, that is, the second grid 221 is arranged along the horizontal direction. The third arc extinguishing structure 23 comprises a plurality of third grids 231 as arc extinguishing grids 2, and the ends of the two adjacent third grids 231 away from the dynamic contact 11 are respectively inclined to the side away from the first arc extinguishing structure 21, so that the distance between the two adjacent third grids 231 close to the dynamic contact 11 is less than the distance between the two ends away from the dynamic contact 11, that is, the third grid 231 is arranged at an angle with the first grid 211. In this embodiment, the arrangement of the second grid 221 of the second arc extinguishing structure 22 is the same as that of the second grid 221 of the side arc extinguishing structure 20 in the first embodiment, and the first grid 211 of the first arc extinguishing structure 21 is slightly inclined, and the first direction and the second direction are arranged at an angle. The first grid 211 and the second grid 221 of 21 in this embodiment can also adopt the right angle arrangement of the first embodiment, which will not be described here.

[0085] Preferably, the third grid 231 of the third arc extinguishing structure 23 closest to the first arc extinguishing structure 21 has an included angle with the first grid 211 less than or equal to 2 degrees. And the third grid 231 of the third arc extinguishing structure 23 farthest from the first arc extinguishing structure 21 is parallel to the second direction, that is, the included angle between the third grid 231 of the third arc extinguishing structure 23 farthest from the first arc extinguishing structure 21 and the first grid 211 is 70 to 90 degrees. In this way, the included angle between the third grid 231 in the third arc extinguishing structure 23 and the first grid 211 is 1 to 90 degrees, and the closer the third grid 231 to the first arc extinguishing structure 21, the smaller the included angle between the third grid 231 and the first grid 211.

[0086] Further, the embodiment includes a separation structure 24, which is the same as the first embodiment. The first separation section 241 of the separation structure 24 is located between the first arc extinguishing structure 21 and the second arc extinguishing structure 22, and the second separation section 242 is located between the first arc extinguishing structure 21 and the second arc extinguishing structure 22.

[0087] As shown in Figure 1 One of the two connection terminals 14 is arranged above the third arc extinguishing structure 23, and the connection terminal 14 is connected to the movable contact 11. The movable arc guiding piece 111 is arranged between the connection terminal 14 and the third arc extinguishing structure 23. The movable arc guiding piece 111 includes a connecting portion 112 connected to the connection terminal 14 and an arc guiding portion 113 located on the side of the third arc extinguishing structure 23 away from the first arc extinguishing structure 21. The connecting portion 112 and the arc guiding portion 113 are connected by a supporting portion 114, which extends through the narrow gap 40 to the side of the third arc extinguishing structure 23 away from the first arc extinguishing structure 21. The supporting portion 114 is arranged parallel to the third grid plate 231 of the third arc extinguishing structure 23 farthest from the first arc extinguishing structure 21. When the movable contact 11 moves away from the stationary contact 12, the current flowing between the movable contact 11 and the stationary contact 12 is reversed, and the two ends of the arc move to the movable arc guiding piece 111 and the stationary arc guiding piece, respectively, which can lengthen the circuit and facilitate the extinguishing of the arc.

[0088] As shown in Figures 11-12 The third embodiment of the arc extinguishing system is shown. The overall structure of the third embodiment is similar to that of the second embodiment, except that the third grid plate 231 of the third arc extinguishing structure 23 farthest from the first arc extinguishing structure 21 is provided with a bending portion 204. The bending portion 204 bends towards the adjacent third grid plate 231, which can attract the arc. In this way, the movable arc guiding piece 111 can not be provided. Of course, the movable arc guiding piece 111 can also be provided.

[0089] Specifically, the bending part 204 comprises a first bending section 2041, a second bending section 2042 and a third bending section 2043, the first bending section 2041 is connected between the third grid sheet 231 and the second bending section 2042, the third bending section 2043 is connected with one end of the second bending section 2042 away from the first bending section 2041, the third bending section 2043 and the second bending section 2042 are arranged in a V shape, the second bending section 2042 is bent towards the adjacent third grid sheet 231, and the third bending section 2043 is bent towards the moving contact 11 in the open position, the third bending section 2043 and the second bending section 2042 are respectively provided with a grid sheet through hole 2044, and the grid sheet through hole 2044 on the third bending section 2043 is communicated with the grid sheet through hole 2044 on the second bending section 2042. Preferably, the third grid sheet 231 farthest from the first arc extinguishing structure 21 in the third arc extinguishing structure 23 is arranged in parallel with the second direction, that is, the third grid sheet 231 farthest from the first arc extinguishing structure 21 is parallel with the second grid sheet 221.

[0090] Preferably, the structure of the third grid sheet 231 is the same as that of the separation structure 24, which can reduce the types of parts, reduce the cost and the difficulty of assembly. Of course, the third grid sheet 231 can also be machined separately, which belongs to the protection scope of the present application.

[0091] It should be noted that in the description of the present application, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used in use, and are only for the convenience of description, and cannot be understood as indicating that the device or element must have a specific orientation, therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation, and cannot be understood as indicating relative importance.

[0092] The above is a further detailed description of the present application in combination with specific preferred embodiments, and cannot be considered as limiting the specific implementation of the present application to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, without departing from the concept of the present application, a number of simple deductions or substitutions can be made, which should be considered as falling within the protection scope of the present application.

Claims

1. A molded case circuit breaker comprising a housing and a phase pole unit arranged in the housing, the housing being provided with an operating mechanism (17) and a rotating shaft system (18), the phase pole unit comprising at least a movable contact (11), a stationary contact (12), a release (13) and an arc extinguishing system, and two terminal blocks (14) connected to the movable contact (11) and the stationary contact (12), respectively, the arc extinguishing system comprising a plurality of arc extinguishing vanes (2), characterized in that: The arc extinguishing system comprises two side arc extinguishing structures (20) and a first arc extinguishing structure (21) arranged between the two side arc extinguishing structures (20), the first arc extinguishing structure (21) comprises a plurality of first grid plates (211) as arc extinguishing grid plates (2), the plurality of first grid plates (211) are arranged in parallel with a first direction, the arc extinguishing grid plates of the two side arc extinguishing structures (20) are arranged at an angle or a right angle with the first direction, and a raised separation structure (24) is arranged between the first arc extinguishing structure (21) and at least one side arc extinguishing structure (20).

2. The molded case circuit breaker of claim 1, wherein: The two side arc extinguishing structures (20) each comprise a plurality of second grid plates (221) as arc extinguishing grid plates (2), the plurality of second grid plates (221) are arranged in parallel with a second direction, and the included angle between the first direction and the second direction ranges from 70 to 90 degrees.

3. The molded case circuit breaker of claim 2, wherein: The first direction is the height direction of the molded case circuit breaker, and the second direction is the length direction of the molded case circuit breaker, and the first direction is perpendicular to the second direction.

4. The molded case circuit breaker of claim 1, wherein: The two side arc extinguishing structures (20) are respectively a second arc extinguishing structure (22) and a third arc extinguishing structure (23), the second arc extinguishing structure (22) is arranged below the static contact (12), the third arc extinguishing structure (23) is arranged below the dynamic contact (11) when the dynamic contact (11) is in the open position, the second arc extinguishing structure (22) comprises a plurality of second grid plates (221) arranged in parallel with the second direction, the included angle between the first direction and the second direction ranges from 70 to 90 degrees, and the third arc extinguishing structure (23) comprises a plurality of third grid plates (231) as arc extinguishing grid plates (2), the ends of two adjacent third grid plates (231) away from the dynamic contact (11) are respectively inclined to the side away from the first arc extinguishing structure (21), so that the distance between the ends of the two adjacent third grid plates (231) close to the dynamic contact (11) is less than the distance between the ends away from the dynamic contact (11), and the included angle between the third grid plate (231) and the first grid plate (211) ranges from 1 to 90 degrees.

5. The molded case circuit breaker of claim 4, wherein: The included angle between the third grid plate (231) closest to the first arc extinguishing structure (21) in the third arc extinguishing structure (23) and the first grid plate (211) is less than or equal to 2 degrees, and / or the third grid plate (231) farthest from the first arc extinguishing structure (21) in the third arc extinguishing structure (23) is arranged in parallel with the second grid plate (221).

6. The molded case circuit breaker of claim 3 or 4, wherein: The distances of the plurality of second grid plates (221) to the first arc extinguishing structure (21) gradually increase in the direction close to the static contact (12), so that an arc extinguishing groove is formed between the plurality of second grid plates (221) and the first arc extinguishing structure (21), and the width of the end of the arc extinguishing groove close to the static contact (12) is greater than the width of the end of the arc extinguishing groove away from the static contact (12).

7. The molded case circuit breaker of claim 1, wherein: The separation structure (24) comprises a separation grid sheet (240), the separation grid sheet (240) comprises a first separation section (241), a second separation section (242) and a third separation section (243), the two ends of the second separation section (242) are bently connected with the first separation section (241) and the third separation section (243) and are obliquely arranged, the first separation section (241) is arranged on the side of the second separation section (242) close to the first arc extinguishing structure (21), and the third separation section (243) is located between the corresponding side arc extinguishing structure (20) and the bottom of the shell.

8. The molded case circuit breaker of claim 7, wherein: The separation grid sheet (240) is provided with a separation through hole (246), and the two ends of the separation through hole (246) are located on the first separation section (241) and the third separation section (243) respectively.

9. The molded case circuit breaker of claim 8, wherein: The side edge of one end of the separation through hole (246) on the first separation section (241) forms a first separation surface (281), the side edge of one end of the separation through hole (246) on the third separation section (243) forms a second separation surface (291), the first separation surface (281) is provided with a second notch (282), the bottom of the second notch (282) is arranged in a staggered manner with the bottom of the notch (202) of the adjacent arc extinguishing grid sheet (2), and the second separation surface is provided with a third notch (292), and the bottom of the third notch (292) is arranged in a staggered manner with the bottom of the notch (202) of the adjacent arc extinguishing grid sheet (2).

10. The molded case circuit breaker of claim 8, wherein: The first separation section (241) is arranged in parallel with the first direction, and the second separation section (242) is arranged at an oblique angle with the first separation section (241).

11. The molded case circuit breaker of claim 4, wherein: One of the two connecting terminals (14) is arranged above the third arc extinguishing structure (23) in a corresponding manner, and the connecting terminal (14) is connected with the movable contact (11), and a movable arc guiding sheet (111) is arranged between the connecting terminal (14) and the third arc extinguishing structure (23), the movable arc guiding sheet (111) comprises a connecting portion (112) connected with the connecting terminal (14) and an arc guiding portion (113) located on the side of the third arc extinguishing structure (23) away from the first arc extinguishing structure (21), the connecting portion (112) and the arc guiding portion (113) are connected through a supporting portion (114), and the supporting portion (114) extends to the side of the third arc extinguishing structure (23) away from the first arc extinguishing structure (21) through the narrow gap (40).

12. The molded case circuit breaker of claim 1, wherein: The arc extinguishing system further comprises two gas generating plates (4) arranged oppositely, a narrow gap (40) for avoiding the movable contact (11) is arranged between the two gas generating plates (4), the gas generating plate (4) comprises a gas generating side plate (41) and a gas generating boss (42) located between the gas generating side plate (41) and the corresponding fixed plate (3), the gas generating boss (42) is connected with the corresponding fixed plate (3), the gas generating side plate (41) is arranged in a spaced manner with the fixed plate (3), and the arc extinguishing grid sheet (2) is provided with two insertion legs (203), and the two insertion legs (203) of the arc extinguishing grid sheet (2) are used for being inserted between the gas generating side plate (41) and the corresponding fixed plate (3) respectively.

13. The molded case circuit breaker of claim 12, wherein: The separation structure (24) comprises a separation grid sheet (240), a middle part of the separation grid sheet (240) is provided with a separation through hole (246), the separation structure (24) is provided with a third separation part (247) on both sides of the separation through hole (246) close to the two side fixed plates (3), the gas production side plate (41) comprises an insertion part (47) corresponding to the separation structure (24), the insertion part (47) is used for being inserted into the separation through hole (246), and the two third separation parts (247) are respectively located between the two insertion parts (47) and the corresponding fixed plates (3).

14. The molded case circuit breaker of claim 12, wherein: The length of the insertion leg (203) of the first grid sheet (211) is greater than that of the insertion leg (203) of the arc extinguishing grid sheet (2) of the side arc extinguishing structure (20), and the gas production boss (42) is provided with a gas production slot (44) for inserting the insertion leg (203) of the first grid sheet (211).

15. The molded case circuit breaker of claim 12, wherein: The gas production plate (4) further comprises a gas production top plate (45) and an upwardly protruding protruding structure (46), one side arc extinguishing structure (20) is correspondingly arranged below the static contact (12), a static arc guiding plate (121) is arranged between the side arc extinguishing structure (20) and the static contact (12), the gas production top plate (45) is located between the side arc extinguishing structure (20) and the static arc guiding plate (121) and is used for limiting the static arc guiding plate (121).

16. The molded case circuit breaker of claim 1, wherein: The arc extinguishing grid sheet (2) is provided with a notch (202) recessed to the middle part of the arc extinguishing grid sheet (2), the recessed directions of the notches (202) of the two adjacent arc extinguishing grid sheets (2) are arranged at an oblique angle, and the bottoms of the notches (202) of the two adjacent arc extinguishing grid sheets (2) are arranged in a staggered manner.

17. The molded case circuit breaker of claim 1, wherein: The shell comprises a lower shell (15) and an upper shell (16), the upper shell (16) is provided with an operating mechanism (17) and a rotating shaft system (18), the two wiring terminals (14), the movable contact (11), the static contact (12) and the release (13) are arranged in the upper shell (16), the arc extinguishing system is arranged in the lower shell (15), and the lower shell (15) is provided with exhaust ports (151) at two ends of the arc extinguishing system.

18. The molded case circuit breaker of claim 17, wherein: The two wiring terminals of the phase pole unit are arranged at two ends of the upper shell (16) in a relative manner, the movable contact (11), the static contact (12) and the release (13) of the phase pole unit are arranged between the two wiring terminals, the movable contact (11) and the static contact (12) are arranged in the middle part of the phase pole unit, the release (13) is arranged on the side surface of the static contact (12) away from the movable contact (11), the rotating shaft system (18) spans multiple phase pole units and is correspondingly arranged above the movable contact (11), the operating mechanism (17) is arranged above one of the phase pole units and is used for driving the rotating shaft system (18) to rotate, when a fault occurs in the circuit connected to the release (13), the release (13) is used for triggering the operating mechanism (17) to release, so that the operating mechanism (17) drives the rotating shaft system (18) to rotate, and the rotating shaft system (18) drives the movable contact (11) and the static contact (12) of all the phase pole units to separate.

19. The molded case circuit breaker of claim 4, wherein: The third grid sheet (231) farthest from the first arc extinguishing structure (21) in the third arc extinguishing structure (23) is provided with a bending part (204) which bends towards the adjacent third grid sheet (231).

20. The molded case circuit breaker of claim 19, wherein: The bending part (204) comprises a first bending section (2041), a second bending section (2042) and a third bending section (2043), the first bending section (2041) is connected between the third grid sheet (231) and the second bending section (2042), the third bending section (2043) is connected with one end of the second bending section (2042) away from the first bending section (2041), the third bending section (2043) and the second bending section (2042) are arranged in a V shape, the second bending section (2042) bends towards the adjacent third grid sheet (231), the third bending section (2043) bends towards the moving contact (11) in the open position, the third bending section (2043) and the second bending section (2042) are respectively provided with a grid sheet through hole (2044), the grid sheet through hole (2044) on the third bending section (2043) communicates with the grid sheet through hole (2044) on the second bending section (2042).

21. The molded case circuit breaker of claim 4, wherein: The third grid sheet (231) has the same structure as the separation structure.

Images