Molded case circuit breaker

Abstract

A molded case circuit breaker comprises a housing, an operating mechanism, a rotating shaft system and at least one phase pole unit, the operating mechanism, the rotating shaft system and the at least one phase pole unit are arranged in the housing, and the phase pole unit at least comprises a moving contact, a static contact, a release, an arc extinguishing system and two wiring terminals respectively connected with the moving contact and the static contact; the shell comprises a lower shell and an upper shell, an operating mechanism and a rotating shaft system are arranged in the upper shell, and the two wiring terminals, the moving contact, the static contact and the release are all arranged in the upper shell; the arc extinguishing system is arranged in the lower shell, the arc extinguishing system comprises an arc extinguishing chamber, and the arc extinguishing chamber comprises a plurality of arc extinguishing grid sheets arranged in the lower shell; the length of the lower shell is larger than that of the upper shell, aiming at the requirements of different arc extinguishing capabilities, only the arc extinguishing chamber and the lower shell need to be replaced, other parts are universal, the integrated arc extinguishing chamber is arranged in the lower shell, the space of the lower shell is fully utilized, and the capacity of the arc extinguishing chamber is maximized.

Description

TECHNICAL FIELD

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

[0002] With the rapid development of new energy industry, direct current technology is also applied more and more widely, and the performance requirement and breaking index of molded case circuit breaker for photovoltaic system are gradually improved, such as AC1150V, DC1500V and the like. According to the index requirement design, the conventional molded case circuit breaker is generally one model molded case circuit breaker corresponding to one index. When the molded case circuit breaker of multiple index parameters is needed, a plurality of specifications of molded case circuit breakers will appear. More than eighty percent of the parts in these multiple specifications of molded case circuit breakers are common, but the arc extinguishing capacity requirements of molded case circuit breakers of different specifications are different, so the sizes of arc extinguishing chambers are also different, which causes that the arc extinguishing chambers of multiple specifications of molded case circuit breakers cannot be generally used. If the mode of externally connecting a second arc extinguishing chamber is adopted, the arc extinguishing grids between the two arc extinguishing chambers are difficult to effectively cooperate, and are not fully utilized. SUMMARY

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

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

[0005] A molded case circuit breaker, comprising a shell and an operating mechanism, a rotating shaft system and at least one phase pole unit in the shell, the phase pole unit at least comprising a moving contact, a stationary contact, a release, an arc extinguishing system and two wiring terminals connected with the moving contact and the stationary contact respectively; the shell comprises a lower shell and an upper shell, the operating mechanism and the rotating shaft system are arranged in the upper shell, and the two wiring 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, the arc extinguishing system comprises an arc extinguishing chamber, and the arc extinguishing chamber comprises a plurality of arc extinguishing grids arranged in the lower shell; the length of the lower shell is greater than the length of the upper shell.

[0006] Preferably, the lower shell is integrally formed and comprises a base section with the same length as the upper shell and an extension section connected with the base section, and the arc extinguishing chamber is arranged in the base section and the extension section, and a plurality of arc extinguishing grids are arranged at positions corresponding to the base section and the extension section;

[0007] The arc extinguishing chamber comprises a first arc extinguishing part arranged corresponding to the base section and at least one second arc extinguishing part arranged corresponding to the extension section, a plurality of arc extinguishing grids are arranged between the first arc extinguishing part and the second arc extinguishing part respectively, the base section accommodates the first arc extinguishing part, and the extension section accommodates the corresponding second arc extinguishing part.

[0008] Preferably, the lower shell includes a base and at least one extension seat detachably connected to the base, the arc extinguishing chamber includes a first arc extinguishing portion arranged corresponding to the base and at least one second arc extinguishing portion arranged corresponding to the extension seat, the base accommodates the first arc extinguishing portion, and the extension seat accommodates the corresponding second arc extinguishing portion.

[0009] Preferably, the first arc extinguishing portion is provided with a protruding structure extending into the upper shell, the protruding structure is located between the side of the static contact and the bottom of the rotating shaft system, and a contact slot for passing the moving contact is provided in the middle of the protruding structure, and the rotating shaft system is used to drive the moving contact to swing in the contact slot to contact and separate from the static contact.

[0010] Preferably, the two connecting terminals of the phase pole unit are relatively arranged at the two ends of the upper shell, the moving contact, static contact and release of the phase pole unit are arranged between the two connecting terminals, the moving contact and static contact are arranged in the middle of the phase pole unit, the release is arranged on the side of the static contact away from the moving contact, the rotating shaft system spans multiple phase pole units and is correspondingly arranged above the moving contact, and the operating mechanism is arranged above one of the phase pole units for driving the rotating shaft system to rotate.

[0011] Preferably, the arc extinguishing chamber includes two arc extinguishing side plates arranged opposite to each other, the middle parts of the two arc extinguishing side plates constitute a first arc extinguishing portion, and the ends of the two arc extinguishing side plates arranged opposite to each other at both ends of their respective first arc extinguishing portions constitute two second arc extinguishing portions, and the multiple arc extinguishing grids include a plurality of first grids arranged obliquely between the two arc extinguishing side plates in parallel with a first direction, and a plurality of second grids arranged obliquely between the two arc extinguishing side plates in parallel with a second direction, and the first direction and the second direction are arranged at an acute angle.

[0012] Preferably, an intermediate grid is provided between the first grid and the second grid, and the intermediate grid is V-shaped, comprising a first side and a second side connected to each other, the first side and the second side being respectively arranged parallel to the first direction and the second direction, the first grid is provided in one second arc-extinguishing portion, and the second grid is provided in the other second arc-extinguishing portion.

[0013] Preferably, the lower shell is provided with a middle boss protruding toward the middle grid plate, and the middle boss is used to be inserted into and limitedly engaged between the first side edge and the second side edge.

[0014] Preferably, two gas generating members are arranged between the two arc extinguishing side plates, and the two gas generating members are respectively arranged corresponding to the two arc extinguishing side plates, the gas generating member comprises a gas generating side plate and a gas generating top plate connected to each other, the gas generating side plate is arranged opposite to the corresponding arc extinguishing side plate, and the gas generating top plate is arranged between the gas generating side plate and the arc extinguishing side plate, the gas generating top plate, the gas generating side plate and the arc extinguishing side plate form an arc extinguishing groove which is inverted above the arc extinguishing grid, and the arc extinguishing grid is provided with two insertion parts extending upward to the gas generating top plate, and the two insertion parts are respectively inserted into the arc extinguishing groove formed between the two gas generating members and the corresponding side plate.

[0015] Preferably, the gas generating top plate is protruded upward in the shell to form a protruding structure, the gas generating side plate and the arc extinguishing side plate are respectively provided with a gas generating protrusion and an arc extinguishing protrusion extending upward in the shell, the gas generating protrusion and the arc extinguishing protrusion are arranged opposite to each other on two sides of the protruding structure, and the insertion part of the arc extinguishing grid arranged below the protruding structure extends upward and is inserted into the protruding structure.

[0016] Preferably, the two gas generating members are provided with a first arc generating sheet and a second arc generating sheet, one end of the first arc generating sheet is connected to the static contact in an equipotential manner, and the other end extends along the upper side of the arc extinguishing chamber to one side of the arc extinguishing chamber, one end of the second arc generating sheet is connected to the movable contact in an equipotential manner, or one end of the second arc generating sheet is arranged adjacent to the breaking position of the movable contact, and the other end of the second arc generating sheet extends along the upper side of the arc extinguishing chamber to the other side of the arc extinguishing chamber.

[0017] Preferably, the upper shell comprises a middle cover and an upper cover arranged on the middle cover, the rotating shaft system is arranged on the inner side of the middle cover, and the middle cover is provided with a contact hole for passing through the movable contact.

[0018] Preferably, the base is provided with an exhaust hole and a mounting structure at opposite ends in the length direction of the shell, one end of the extension base is provided with a connecting structure which is detachably connected to the mounting structure, and an arc extinguishing channel which is used to communicate with the exhaust hole, the other end of the extension base away from the connecting structure is provided with the exhaust hole, and the arc extinguishing chamber can pass through the arc extinguishing channel, so that the first arc extinguishing part is located in the base, and the second arc extinguishing part can be located in the corresponding extension base.

[0019] Preferably, the other end of the extension base away from the base is provided with a mounting structure, the mounting structure of the extension base and the mounting structure on the base are the same structure, and the other end of the extension base away from the base can be connected to the connecting structure of the other extension base through the mounting structure.

[0020] Preferably, the base comprises a base bottom and two partition plates respectively arranged corresponding to each phase electrode unit, and two adjacent phase electrode units share one partition plate, the mounting structure comprises a mounting groove arranged on the partition plate, the connecting structure comprises a mounting column, the mounting column comprises a limiting column and a limiting plate connected to the limiting column, and the mounting column can be inserted into the limiting fitting of the mounting groove.

[0021] Preferably, the mounting structure further comprises a first screw hole arranged on the base bottom for connecting the first screw, and the connecting structure further comprises a connecting plate arranged on the bottom side of the extension seat, the first screw passing through the connecting plate and being connected with the first screw hole.

[0022] Preferably, the extension seat is provided with a detachable extension cover, the extension cover is provided with a second mounting column corresponding to the mounting column on the extension seat, the second mounting column has the same cross-sectional shape as the mounting column, the upper shell is provided with a second mounting groove for inserting the second mounting column, and the second mounting column is limitedly fitted into the second mounting groove.

[0023] Preferably, the extension seat comprises an extension part and two extension partitions respectively arranged corresponding to each phase electrode unit, two adjacent phase electrode units share one extension partition, the inner side of the extension partition is provided with a second connecting hole for passing through a second screw, the opening of the second connecting hole away from the extension cover is located on the bottom side of the extension part, the extension cover is provided with a second screw hole for connecting the second screw, and the second screw is connected with the extension cover after passing through the extension seat from the second connecting hole.

[0024] Preferably, the number of the extension seat and the extension cover corresponds to the number of the phase electrode unit, the plurality of extension seats are integrally formed, and the plurality of extension covers are integrally formed.

[0025] Preferably, the exhaust hole of the extension seat and the exhaust hole structure of the base are the same, and the exhaust hole is provided with a detachable arc separation net plate.

[0026] Preferably, the extension seat and the base are respectively provided with at least two oppositely arranged insertion grooves corresponding to the position of the exhaust hole, each insertion groove is formed by two first mounting convex ribs, and the two side edges of the arc separation net plate can be respectively inserted into the two insertion grooves for limiting.

[0027] Preferably, two extension seats are included, the two extension seats are oppositely arranged at the two ends of the base along the length direction of the outer shell, the arc extinguishing chamber comprises two second arc extinguishing parts corresponding to the two extension seats respectively, the two second arc extinguishing parts are oppositely arranged at the two ends of the first arc extinguishing part along the length direction of the outer shell, and the two second arc extinguishing parts are respectively inserted into the corresponding extension seats.

[0028] Preferably, the movable contact is provided with an arc-shaped baffle, and when the movable contact moves away from the static contact, the baffle is used to shield one end of the contact hole close to the static contact.

[0029] Preferably, the length of the arc extinguishing grid piece at the convex structure is greater than the length of the arc extinguishing grid piece in the first arc extinguishing part and the length of the arc extinguishing grid piece in the second arc extinguishing part.

[0030] The plastic shell circuit breaker of the utility model, set up the lower shell of placing the arc extinguishing chamber alone, wiring terminal, moving contact, static contact and release are set up in the upper shell, aiming at the requirement of different arc extinguishing capacity, only need to replace the arc extinguishing chamber and lower shell, can adopt bigger arc extinguishing chamber and lower shell, the rest parts are general, not only can satisfy multiple technical indexes, but also can save the cost, and set up the integral arc extinguishing chamber in the lower shell, make full use of the space of the lower shell, make the arc extinguishing chamber capacity maximization, reach higher breaking index.

[0031] In addition, by the size of the lower shell is adjusted through the detachable extension base, if high voltage or high breaking index is required, the number of extension bases can be increased or larger size extension bases are replaced in the base, more arc extinguishing fin arrangement schemes are obtained, the arc extinguishing chamber capacity is maximized, and higher breaking index is reached, if low voltage or low breaking index is required, the number of extension bases can be reduced or smaller size extension bases are replaced, the size of the lower shell is matched with the size of the arc extinguishing chamber, except that the base and the arc extinguishing chamber are different, the rest parts are general, multiple technical indexes can be satisfied, and cost can be saved.

[0032] In addition, by setting the protruding structure extending into the upper shell in the first arc extinguishing part, the first arc extinguishing part can be closer to the moving contact and the static contact. In particular, the length of the arc extinguishing fin in the protruding structure is greater than the length of the arc extinguishing fin at other positions, and the arc extinguishing performance can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is the structure schematic view of the plastic shell circuit breaker of the utility model;

[0034] Figure 2 It is the assembly schematic view of the extension base and the extension cover of the utility model;

[0035] Figure 3 It is the sectional view of the plastic shell circuit breaker of the utility model;

[0036] Figure 4 It is the assembly schematic view of the extension base and the base of the utility model;

[0037] Figure 5 It is the structure schematic view of the base of the utility model;

[0038] Figure 6 It is the structure schematic view of the extension base of the utility model;

[0039] Figure 7 It is the structure schematic view of the extension cover of the utility model;

[0040] Figure 8 It is the structure schematic view of the middle cover of the utility model;

[0041] Figure 9 It is the structure schematic view of the arc extinguishing chamber of the utility model;

[0042] Figure 10 is the exploded view of the arc-extinguishing chamber of the utility model;

[0043] Figure 11 is the structural schematic view of the integrally formed lower shell in the utility model.

[0044] In the figure:

[0045] 1 lower shell 121 extension

[0046] 2 upper shell 122 extension partition

[0047] 3 operating mechanism 123 second connecting hole

[0048] 4 rotating shaft mechanism system 511 baffle

[0049] 6 arc-extinguishing chamber 631 first grid

[0050] 11 base 632 second grid

[0051] 12 extension base 633 intermediate grid

[0052] 13 extension cover 634 intermediate boss

[0053] 21 middle cover 635 insertion part

[0054] 22 contact hole 651 gas production side plate

[0055] 51 moving contact 652 gas production top plate

[0056] 52 release 711 arc separation net plate

[0057] 53 stationary contact 712 insertion slot

[0058] 61 first arc-extinguishing part 713 first installation convex rib

[0059] 62 second arc-extinguishing part 714 second installation convex rib

[0060] 63 arc-extinguishing grid 715 second insertion slot

[0061] 64 arc-extinguishing side plate 716 avoidance groove

[0062] 65 gas production part 721 installation groove

[0063] 66 protruding structure 722 first screw

[0064] 67 first arc guide piece 723 first screw hole

[0065] 68 second arc guide piece 730 installation column

[0066] 71 exhaust hole 731 limiting column

[0067] 72 mounting structure 732 limit plate

[0068] 73 connection structure 733 connection plate

[0069] 74 arc extinguishing channel 734 second mounting column

[0070] 75 limiting rib 735 second installation slot

[0071] 111 base bottom 7230 first connection hole

[0072] 112 partition DETAILED DESCRIPTION

[0073] The following embodiments are given in conjunction with the accompanying drawings to further illustrate the specific implementation of the molded case circuit breaker of the present invention. The molded case circuit breaker of the present invention is not limited to the description of the following embodiments.

[0074] like Figure 1-2 As shown, the molded case circuit breaker of this embodiment includes a housing and two phase pole units arranged side by side in the housing. In other embodiments, the circuit breaker may also be single-pole, three-pole or four-pole, correspondingly provided with a single, three or four phase pole units. The phase pole units include at least a moving contact 51, a static contact 53, a trip unit 52 and an arc extinguishing system, and two wiring terminals respectively connected to the moving contact 51 and the static contact 53. The housing includes a lower housing 1 and an upper housing 2. The upper housing 2 is provided with an operating mechanism 3 and a rotating shaft system 4, and the two wiring terminals, the moving contact 51, the static contact 53 and the trip unit 52 are all provided in the upper housing 2.

[0075] The arc extinguishing system is arranged in the lower shell 1, and the arc extinguishing system includes an arc extinguishing chamber 6, and the arc extinguishing chamber 6 includes a plurality of arc extinguishing grids 63 arranged in the lower shell 1;

[0076] The length of the lower shell 1 is greater than that of the upper shell 2 .

[0077] The molded case circuit breaker of the present invention is provided with a lower shell 1 in which an arc extinguishing chamber 6 is separately placed, and the wiring terminals, moving contact 51, static contact 53 and trip unit 52 are arranged in the upper shell 2. To meet the requirements of different arc extinguishing capabilities, it is only necessary to replace the arc extinguishing chamber 6 and the lower shell 1. A larger arc extinguishing chamber 6 and lower shell 1 can be used, and the remaining parts are universal, which not only meets multiple technical indicators but also saves costs. In addition, an integrated arc extinguishing chamber 6 is provided in the lower shell 1, which fully utilizes the space of the lower shell 1, maximizes the capacity of the arc extinguishing chamber, and achieves a higher breaking index.

[0078] like Figure 1-2The first embodiment is shown, the lower shell 1 includes a base 11 and at least one extension seat 12 detachably connected with the base 11, the arc extinguishing chamber 6 includes a first arc extinguishing part 61 arranged corresponding to the base 11 and at least one second arc extinguishing part 62 arranged corresponding to the extension seat 12, a plurality of arc extinguishing vanes 63 are respectively arranged in the first arc extinguishing part 61 and the second arc extinguishing part 62, the base 11 is used for accommodating the first arc extinguishing part 61, the extension seat 12 is used for accommodating the corresponding second arc extinguishing part 62, the base 11 is provided with an exhaust hole 71 and a mounting structure 72 at opposite ends along the length direction of the shell, one end of the extension seat 12 is provided with a connecting structure 73 detachably connected with the mounting structure 72, and an arc extinguishing channel 74 used for communicating with the exhaust hole 71, the other end of the extension seat 12 away from the connecting structure 73 is provided with the exhaust hole 71, and the arc extinguishing chamber 6 can pass through the arc extinguishing channel 74, so that the first arc extinguishing part 61 is located in the base 11, and the second arc extinguishing part 62 can be located in the corresponding extension seat 12.

[0079] The molded case circuit breaker of the embodiment can adjust the size of the lower shell 1 through the detachable extension seat 12, if high voltage or high breaking index is required, the number of the extension seat 12 can be increased or the extension seat 12 with larger size can be replaced in the base 11, so that more arrangement schemes of the arc extinguishing vanes 63 are obtained, the capacity of the arc extinguishing chamber is maximized, and higher breaking index is achieved; if low voltage or low breaking index is required, the number of the extension seat 12 can be reduced or the extension seat 12 with smaller size can be replaced, so that the size of the lower shell 1 matches the size of the arc extinguishing chamber 6, and the rest of the components are common except the base 11 and the arc extinguishing chamber, which not only can meet various technical indexes, but also can save cost.

[0080] As shown in Figure 2 , 6 , one end of the extension seat 12 away from the base 11 is provided with the mounting structure 72, the mounting structure 72 of the extension seat 12 and the mounting structure 72 on the base 11 are the same structure, and the one end of the extension seat 12 away from the base 11 can be connected with the connecting structure 73 of another extension seat 12 through the mounting structure 72.

[0081] The base 11 includes a base bottom 111 and two partition plates 112 respectively arranged corresponding to each phase pole unit, and one partition plate 112 is shared by two adjacent phase pole units, the mounting structure 72 includes a mounting groove 721 arranged on the partition plate 112, the connecting structure 73 includes a mounting column 730, the mounting column 730 includes a limiting column 731 and a limiting plate 732 connected with the limiting column 731, and the mounting column 730 can be inserted into the mounting groove 721 for limiting cooperation.

[0082] As shown in Figure 4As shown, the mounting structure 72 further comprises a first screw hole 723 provided on the base bottom 111 for connecting the first screw 722, and the connecting structure 73 further comprises a connecting plate 733 provided on the bottom side of the extension seat 12, the connecting plate 733 is provided with a first connecting hole 7230 corresponding to the first screw hole 723, the first screw 722 passes through the first connecting hole 7230 and is connected with the first screw hole 723, so that the connecting plate 733 is limited with the base bottom 111. The limiting column 731 in the embodiment is in a cylindrical shape, the limiting plate 732 is in a flat shape, the diameter of the limiting column 731 is greater than the thickness of the limiting plate 732, after the limiting column 731 is inserted into the mounting slot 721 along the height direction of the shell, the limiting column 731 can be limited and matched with the mounting slot 721 along the length direction of the shell. Of course, the limiting column 731 can also adopt other shapes, such as triangular, trapezoidal or other shapes. In addition, a buckle or the like can be used instead of the first screw 722, which belongs to the protection scope of the utility model.

[0083] As shown in Figure 2 , 7 As shown, the extension seat 12 is provided with a detachable extension cover 13, the extension cover 13 is provided with a second mounting column 734 corresponding to the mounting column 730 on the extension seat 12, the cross-sectional shape of the second mounting column 734 is the same as that of the mounting column 730, and the upper shell 2 is provided with a second mounting slot 735 for inserting the second mounting column 734, and the second mounting column 734 is inserted into the second mounting slot 735 for limiting cooperation.

[0084] Preferably, the extension seat 12 comprises an extension part 121 and two extension partitions 122 respectively arranged corresponding to each phase electrode unit, and adjacent two phase electrode units share one extension partition 122, and the inner side of the extension partition 122 is provided with a second connecting hole 123 for passing through a second screw (not shown in the figure), and the opening of the second connecting hole 123 away from the end of the extension cover 13 is located on the bottom side of the extension part 121, the extension cover 13 is provided with a second screw hole (not shown in the figure) for connecting the second screw, and the second screw passes through the extension seat 12 from the second connecting hole 123 and is connected with the extension cover 13, so that the extension cover 13 and the extension seat 12 are connected together.

[0085] Preferably, the number of the extension seat 12 and the extension cover 13 corresponds to the number of the phase electrode unit, a plurality of extension seats 12 are integrally formed, and a plurality of extension covers 13 are integrally formed. Of course, a plurality of extension seats 12 can be separately arranged, a plurality of extension seats 12 are respectively arranged on the base 11, and a plurality of extension covers 13 can be separately arranged and respectively arranged on the extension seat 12.

[0086] As shown in Figure 5-6As shown, the exhaust holes 71 of the extension seat 12 and the exhaust holes 71 of the base 11 are of the same structure, and the exhaust holes 71 are provided with detachable arc isolation screens 711. The arc isolation screens 711 are installed in the exhaust holes 71 to prevent the arc and particles in the arc extinguishing chamber 6 from directly leaving from the exhaust holes 71. After the number of the extension seats 12 is increased, the arc isolation screens 711 of the middle exhaust holes 71 can be detached, the arc extinguishing chamber 6 passes through the exhaust holes 71, and the arc isolation screens 711 are installed only in the outermost exhaust holes 71. Therefore, the device is very flexible to use and has the characteristics of convenient operation.

[0087] As shown, the extension seat 12 and the base 11 are respectively provided with at least two opposite insertion grooves 712 at the positions of the exhaust holes 71. Each insertion groove 712 is formed by two first mounting convex ribs 713. The two sides of the arc isolation screen 711 can be respectively inserted into the two insertion grooves 712 for limiting. In the embodiment, four insertion grooves 712 are provided. Two of the insertion grooves 712 are opposite to the other two insertion grooves 712, and are used for installing two arc isolation screens 711. Three first mounting convex ribs 713 are provided on each arc isolation screen 112 and extension arc isolation screen 122. An insertion groove 712 is formed between every two adjacent first mounting convex ribs 713.

[0088] Further, the bottom of the extension seat 12 and the base 11 is further provided with a second mounting convex rib 714 corresponding to the first mounting convex rib 713. The second mounting convex rib 714 is connected between the bottoms of the corresponding two first mounting convex ribs 713. A second insertion groove 715 for limiting the bottom of the arc isolation screen 711 is formed between the adjacent two second mounting convex ribs 714. The bottom side of the arc extinguishing chamber 6 is provided with an avoiding groove 716 for avoiding the second mounting convex rib 714. The avoiding groove 716 can facilitate the installation of the arc extinguishing chamber 6 and the extension seat 12, and effectively reduce the difficulty of operation.

[0089] Preferably, the first mounting convex rib 713 limits the arc extinguishing chamber 6 along the length direction of the shell. When a plurality of first mounting convex ribs 713 are provided, the first mounting convex rib 713 close to the arc extinguishing chamber 6 limits the arc extinguishing chamber 6 along the length direction of the shell. Of course, the arc extinguishing chamber 6 can also be limited by other structures, such as other bosses or screws.

[0090] As shown, Figure 5 The bottom of the base 11 and the extension seat 12 is respectively provided with a raised limiting convex rib 75 for limiting the arc extinguishing chamber 6 along the height direction of the shell. The upper shell 2 and the extension cover 13 limit the arc extinguishing chamber 6 along the other side of the height direction of the shell.

[0091] As shown, Figure 3As shown, the first arc-extinguishing portion 61 is provided with a protruding structure 66 extending into the upper shell 2. The protruding structure 66 is located between the side of the static contact 53 and the bottom of the rotating shaft system 4. The protruding structure 66 is provided with a contact slot for the movable contact 51 to pass through. One end of the movable contact 51 is disposed on the rotating shaft system 4, and the end of the movable contact 51 away from the rotating shaft system 4 is inserted into the contact slot. The operating mechanism 3 is provided with a handle, which drives the rotating shaft system 4 to rotate through the operating mechanism 3. When the rotating shaft system 4 rotates, it drives the movable contacts 51 of all phase pole units to contact and separate from the static contacts 53. The arc-extinguishing chamber 6 is used to cut the arc generated between the movable contact 51 and the static contact 53. By providing the protruding structure 66 extending into the upper shell 2 on the first arc-extinguishing portion 61, the first arc-extinguishing portion 61 can be brought closer to the movable contact and the static contact.

[0092] Preferably, the length of the arc-extinguishing grid 63 at the protruding structure 66 is greater than the length of the other arc-extinguishing grids 63 in the first arc-extinguishing portion 61 and also greater than the length of the arc-extinguishing grids 63 in the second arc-extinguishing portion 62, thereby improving arc extinguishing performance. Of course, as another inferior embodiment, the protruding structure 66 may not be provided, and the arc-extinguishing grids 63 at the protruding structure 66 may not be lengthened.

[0093] Furthermore, the two wiring terminals of the phase pole unit are relatively arranged at the two ends of the upper shell 2, the moving contact 51, the static contact 53 and the release 52 of the phase pole unit are arranged between the two wiring terminals, the moving contact 51 and the static contact 53 are arranged in the middle of the phase pole unit, and the release 52 is arranged on the side of the static contact 53 away from the moving contact 51. The shaft system 4 spans multiple phase pole units and is correspondingly arranged above the moving contact 51. The operating mechanism 3 is arranged above one of the phase pole units and is used to drive the shaft system 4 to rotate. When a fault occurs in the line where the release 52 is located, the release 52 is used to trigger the operating mechanism 3 to trip, so that the operating mechanism 3 drives the shaft system 4 to rotate, and the shaft system 4 drives the moving contacts 51 and the static contacts 53 of all phase pole units to separate.

[0094] like Figure 2 As shown, this embodiment is provided with two said extension seats 12, and the two extension seats 12 are arranged at the two ends of the base 11 relatively along the length direction of the shell, and the arc extinguishing chamber 6 includes two second arc extinguishing parts 62 corresponding to the two extension seats 12 respectively, and the two second arc extinguishing parts 62 are arranged at the two ends of the first arc extinguishing part 61 relatively along the length direction of the shell, and the two second arc extinguishing parts 62 are respectively used to be inserted into the corresponding extension seats 12.

[0095] like Figure 9-10As shown, the arc-extinguishing chamber 6 comprises two oppositely arranged arc-extinguishing side plates 64, the middle part of the two arc-extinguishing side plates 64 constitutes a first arc-extinguishing part 61, the end part of the two arc-extinguishing side plates 64 oppositely arranged at both ends of the respective first arc-extinguishing part 61 constitutes two second arc-extinguishing parts 62, a plurality of arc-extinguishing vanes 63 comprises a plurality of first vanes 631 obliquely arranged between the two arc-extinguishing side plates 64 parallel to the first direction, and a plurality of second vanes 632 obliquely arranged between the two arc-extinguishing side plates 64 parallel to the second direction, the first direction and the second direction are arranged at an acute angle. It can be understood that the arc-extinguishing side plates 64 can also not be arranged, and the arc-extinguishing vanes 63 can also be directly mounted with the lower shell 1, all of which belong to the protection scope of the present application.

[0096] Further, the first vanes 631 and the second vanes 632 are provided with intermediate vanes 633, the intermediate vanes 633 are V-shaped, comprising a first side and a second side connected, the first side and the second side are arranged parallel to the first direction and the second direction respectively, one second arc-extinguishing part 62 is provided with the first vanes 631, and the other second arc-extinguishing part 62 is provided with the second vanes 632, the lower shell 1 is provided with an intermediate boss 634 protruding towards the intermediate vanes 633, and the intermediate boss 634 is used for limiting and fitting between the first side and the second side. By arranging the upwardly protruding intermediate vanes 633 in the middle of the arc-extinguishing chamber 6, the arc can be cut into two sections by the intermediate vanes 633 first, and then the two sections of arc are cut by the first vanes 631 and the second vanes 632 on both sides, which can improve the cutting speed of the arc and further improve the arc-extinguishing ability. In addition, the intermediate vanes 633 can cooperate with the intermediate boss 634 on the base to limit the arc-extinguishing chamber 6. Preferably, the arc-extinguishing side plates 64 are provided with intermediate notches 640 corresponding to the intermediate vanes 633.

[0097] Further, two gas generating members 65 are arranged between the two arc-extinguishing side plates 64, the two gas generating members 65 are arranged corresponding to the two arc-extinguishing side plates 64 respectively, the gas generating member 65 can generate gas during arc-extinguishing, which can accelerate the gas exhaust during arc-extinguishing, the gas generating member 65 comprises a gas generating side plate 651 and a gas generating top plate 652 connected, the gas generating side plate 651 is arranged opposite to the corresponding arc-extinguishing side plate 64, and the gas generating top plate 652 is arranged between the gas generating side plate 651 and the arc-extinguishing side plate 64, the gas generating top plate 652, the gas generating side plate 651 and the arc-extinguishing side plate 64 surround an arc-extinguishing groove which is invertedly buckled above the arc-extinguishing vane 63, the arc-extinguishing vane 63 is provided with two insertion parts 635 extending upwards to the gas generating top plate 652, and the two insertion parts 635 are respectively inserted into the arc-extinguishing groove surrounded between the two gas generating members 65 and the corresponding side plates.

[0098] Further, the gas production top plate 652 protrudes into the upper shell 2 to form a protruding structure 66, the gas production side plate 651 and the arc extinguishing side plate 64 are respectively provided with a gas production protrusion and an arc extinguishing protrusion extending into the upper shell 2, the gas production protrusion and the arc extinguishing protrusion are oppositely arranged on both sides of the protruding structure 66, the insertion part 635 of the arc extinguishing fin 63 arranged below the protruding structure 66 has a length greater than that of the insertion part 635 of other arc extinguishing fins 63, and the insertion part 635 of the arc extinguishing fin 63 below the protruding structure 66 extends upward and is inserted into the protruding structure 66.

[0099] Further, the two gas production members 65 are provided with a first arc striking piece 67 and a second arc striking piece 68, the first arc striking piece 67 and the second arc striking piece 68 are oppositely arranged at both ends of the moving contact 51, one end of the first arc striking piece 67 is connected to the static contact 53 at the same potential, and the other end extends along the upper side of the arc extinguishing chamber 6 to one side of the arc extinguishing chamber 6, one end of the second arc striking piece 68 is connected to the moving contact 51 at the same potential, or one end of the second arc striking piece 68 is arranged adjacent to the breaking position of the moving contact 51, and the other end extends along the upper side of the arc extinguishing chamber 6 to the other side of the arc extinguishing chamber 6, the first arc striking piece 67 and the second arc striking piece 68 can attract the arc to move along the length direction of the outer shell, and can improve the arc extinguishing effect.

[0100] As shown in Figure 8-9 The upper shell 2 includes a middle cover 21 and an upper cover arranged on the middle cover 21, the rotating shaft system 4 is arranged inside the middle cover 21, the middle cover 21 is provided with a contact hole 22 for passing through the moving contact 51, the moving contact 51 is provided with a baffle 511 in the shape of an arc surface, and when the moving contact 51 moves away from the static contact 53, the baffle 511 is used to shield one end of the contact hole 22 close to the static contact 53 to prevent the arc from moving into the upper shell 2 through the contact hole 22.

[0101] As shown in Figure 11 The lower shell 1 in the second embodiment is integrally formed, including a base section with the same length as the upper shell 2 and an extension section connected to the base section, the arc extinguishing chamber 6 is arranged in the base section and the extension section, and the two arc extinguishing side plates 64 extend into the base section and the extension section and are respectively provided with a plurality of arc extinguishing fins 63 at positions corresponding to the base section and the extension section;

[0102] The arc extinguishing side plate 64 of the arc extinguishing chamber 6 includes a first arc extinguishing part 61 arranged corresponding to the base section and at least one second arc extinguishing part 62 arranged corresponding to the extension section, and a plurality of arc extinguishing fins 63 are respectively arranged between the first arc extinguishing part 61 and the second arc extinguishing part 62 of the two arc extinguishing side plates 64, the base section accommodates the first arc extinguishing part 61, and the extension section accommodates the corresponding second arc extinguishing part 62. The structure of the arc extinguishing chamber 6 is basically the same as that of the first embodiment, and can be appropriately adjusted, for example, the arrangement of the arc extinguishing fins 63 can be adjusted.

[0103] The lower shell of the embodiment can be directly replaced by the lower shell 2 corresponding to the size of the arc-extinguishing chamber 6 after selecting the arc-extinguishing chamber 6 of different sizes, without affecting other parts of the circuit breaker, and the operation is very convenient.

[0104] It should be noted that in the description of the utility model, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship in use, and are only for the convenience of description, and do not indicate that the device or element referred to must have a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating relative importance.

[0105] The above content is a further detailed description of the utility model in combination with specific preferred embodiments, and the specific implementation of the utility model cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the utility model belongs, without departing from the concept of the utility model, a number of simple deductions or substitutions can be made, and all of them should be regarded as falling within the protection scope of the utility model.

Claims

1. A molded case circuit breaker, characterized in that: The invention comprises a housing, an operating mechanism (3) in the housing, a rotating shaft system (4), and at least one phase pole unit, wherein the phase pole unit at least comprises a moving contact (51), a stationary contact (53), a tripper (52), an arc extinguishing system, and two connection terminals respectively connected to the moving contact (51) and the stationary contact (53); The housing comprises a lower housing (1) and an upper housing (2); an operating mechanism (3) and a rotating shaft system (4) are provided in the upper housing (2); and the two connecting terminals, the moving contact (51), the static contact (53) and the release (52) are all provided in the upper housing (2); The arc extinguishing system is arranged in the lower shell (1), the arc extinguishing system comprises an arc extinguishing chamber (6), and the arc extinguishing chamber (6) comprises a plurality of arc extinguishing grids (63) arranged in the lower shell (1); The length of the lower shell (1) is greater than the length of the upper shell (2).

2. The molded case circuit breaker according to claim 1, characterized in that: The lower shell (1) is integrally formed and comprises a base section having the same length as the upper shell (2), and an extension section connected to the base section; the arc extinguishing chamber (6) is arranged in the base section and the extension section, and a plurality of arc extinguishing grids (63) are provided at positions corresponding to the base section and the extension section; The arc extinguishing chamber (6) comprises a first arc extinguishing portion (61) provided in correspondence with the base section and at least one second arc extinguishing portion (62) provided in correspondence with the extension section, a plurality of arc extinguishing grids (63) are provided between the first arc extinguishing portion (61) and the second arc extinguishing portion (62), the base section accommodates the first arc extinguishing portion (61), and the extension section accommodates the corresponding second arc extinguishing portion (62).

3. The molded case circuit breaker according to claim 1, characterized in that: The lower shell (1) comprises a base (11) and at least one extension seat (12) detachably connected to the base (11). The arc extinguishing chamber (6) comprises a first arc extinguishing portion (61) provided in correspondence with the base (11) and at least one second arc extinguishing portion (62) provided in correspondence with the extension seat (12); the base (11) accommodates the first arc extinguishing portion (61), and the extension seat (12) accommodates the corresponding second arc extinguishing portion (62).

4. The molded case circuit breaker according to claim 2 or 3, characterized in that: The first arc extinguishing portion (61) is provided with a protruding structure (66) extending into the upper shell (2), the protruding structure (66) is located between the side of the static contact (53) and the bottom of the rotating shaft system (4), and the middle of the protruding structure (66) is provided with a contact slot for passing the moving contact (51), and the rotating shaft system (4) is used to drive the moving contact (51) to swing in the contact slot to contact and separate with the static contact (53).

5. The molded case circuit breaker according to claim 1, characterized in that: The two connecting terminals of the phase pole unit are arranged at two ends of the upper shell (2) relative to each other; the moving contact (51), the static contact (53) and the release (52) of the phase pole unit are arranged between the two connecting terminals; the moving contact (51) and the static contact (53) are arranged in the middle of the phase pole unit; the release (52) is arranged on the side of the static contact (53) away from the moving contact (51); the rotating shaft system (4) spans across multiple phase pole units and is correspondingly arranged above the moving contact (51); the operating mechanism (3) is arranged above one of the phase pole units and is used to drive the rotating shaft system (4) to rotate.

6. The molded case circuit breaker according to claim 2 or 3, characterized in that: The arc extinguishing chamber (6) comprises two arc extinguishing side plates (64) arranged opposite to each other, wherein the middle portions of the two arc extinguishing side plates (64) constitute a first arc extinguishing portion (61), and the ends of the two arc extinguishing side plates (64) arranged opposite to each other at both ends of the first arc extinguishing portion (61) constitute two second arc extinguishing portions (62), and the plurality of arc extinguishing grids (63) comprise a plurality of first grids (631) arranged between the two arc extinguishing side plates (64) and inclined in parallel with a first direction, and a plurality of second grids (632) arranged between the two arc extinguishing side plates (64) and inclined in parallel with a second direction, wherein the first direction and the second direction are arranged at an acute angle.

7. The molded case circuit breaker according to claim 6, characterized in that: An intermediate grid piece (633) is provided between the first grid piece (631) and the second grid piece (632); the intermediate grid piece (633) is V-shaped and comprises a first side and a second side connected to each other, the first side and the second side being respectively arranged parallel to the first direction and the second direction; the first grid piece (631) is provided in one second arc extinguishing portion (62), and the second grid piece (632) is provided in the other second arc extinguishing portion (62).

8. The molded case circuit breaker according to claim 7, characterized in that: The lower shell (1) is provided with a middle boss (634) protruding toward the middle grid plate (633), and the middle boss (634) is used to be inserted between the first side edge and the second side edge for position-limiting engagement.

9. The molded case circuit breaker according to claim 6, characterized in that: Two gas-producing parts (65) are provided between the two arc-extinguishing side plates (64), and the two gas-producing parts (65) are respectively provided corresponding to the two arc-extinguishing side plates (64). The gas-producing parts (65) include connected gas-producing side plates (651) and gas-producing top plates (652). The gas-producing side plates (651) are arranged opposite to the corresponding arc-extinguishing side plates (64). The gas-producing top plates (652) are arranged between the gas-producing side plates (651) and the arc-extinguishing side plates (64). An arc-extinguishing groove that is inverted above the arc-extinguishing grid (63) is formed between the gas-producing top plates (652), the gas-producing side plates (651) and the arc-extinguishing side plates (64). The arc-extinguishing grid (63) is provided with two insertion parts (635) extending toward the gas-producing top plates (652) above. The two insertion parts (635) are respectively inserted into the arc-extinguishing grooves formed between the two gas-producing parts (65) and the corresponding side plates.

10. The molded case circuit breaker according to claim 9, characterized in that: The gas-producing top plate (652) protrudes toward the upper shell (2) to form a protruding structure (66); the gas-producing side plate (651) and the arc-extinguishing side plate (64) are respectively provided with a gas-producing protrusion and an arc-extinguishing protrusion extending toward the upper shell (2); the gas-producing protrusion and the arc-extinguishing protrusion are relatively arranged on both sides of the protruding structure (66); the insertion portion (635) of the arc-extinguishing grid (63) arranged below the protruding structure (66) extends upward and is inserted into the protruding structure (66).

11. The molded case circuit breaker according to claim 9, characterized in that: A first arc-striking piece (67) and a second arc-striking piece (68) are provided between the two gas-generating parts (65), one end of the first arc-striking piece (67) is connected to the static contact (53) at the same potential, and the other end extends along the top of the arc-extinguishing chamber (6) toward one side of the arc-extinguishing chamber (6), one end of the second arc-striking piece (68) is connected to the moving contact (51) at the same potential, or one end of the second arc-striking piece (68) is arranged near the disconnecting position of the moving contact (51), and the other end of the second arc-striking piece (68) extends along the top of the arc-extinguishing chamber (6) toward the other side of the arc-extinguishing chamber (6).

12. The molded case circuit breaker according to claim 1, characterized in that: The upper shell (2) comprises a middle cover (21) and an upper cover arranged on the middle cover (21); the rotating shaft system (4) is arranged on the inner side of the middle cover (21); and the middle cover (21) is provided with a contact hole (22) for passing a moving contact (51).

13. The molded case circuit breaker according to claim 3, characterized in that: The base (11) is provided with an exhaust hole (71) and a mounting structure (72) at both opposite ends along the length direction of the shell; one end of the extension seat (12) is provided with a connecting structure (73) detachably connected to the mounting structure (72), and an arc extinguishing channel (74) for communicating with the exhaust hole (71); the exhaust hole (71) is provided at one end of the extension seat (12) away from the connecting structure (73); the arc extinguishing chamber (6) can pass through the arc extinguishing channel (74), so that the first arc extinguishing portion (61) is located in the base (11), and the second arc extinguishing portion (62) can be located in the corresponding extension seat (12).

14. The molded case circuit breaker according to claim 13, characterized in that: The end of the extension seat (12) away from the base (11) is provided with a mounting structure (72), the mounting structure (72) of the extension seat (12) and the mounting structure (72) on the base (11) are identical in structure, and the end of the extension seat (12) away from the base (11) can be connected to the connecting structure (73) of another extension seat (12) through the mounting structure (72).

15. The molded case circuit breaker according to claim 14, characterized in that: The base (11) includes a base bottom (111) and two partitions (112) respectively provided for each phase pole unit, and two adjacent phase pole units share one partition (112); the mounting structure (72) includes a mounting groove (721) provided on the partition (112); the connecting structure (73) includes a mounting column (730); the mounting column (730) includes a limiting column (731) and a limiting plate (732) connected to the limiting column (731); the mounting column (730) can be inserted into the mounting groove (721) for limiting engagement.

16. The molded case circuit breaker according to claim 15, characterized in that: The mounting structure (72) further includes a first screw hole (723) provided on the bottom (111) of the base for connecting a first screw (722); the connecting structure (73) further includes a connecting plate (733) provided on the bottom side of the extension seat (12); the first screw (722) passes through the connecting plate (733) and is connected to the first screw hole (723).

17. The molded case circuit breaker according to claim 15, characterized in that: The extension seat (12) is provided with a detachable extension cover (13), and the extension cover (13) is provided with a second mounting post (734) corresponding to the mounting post (730) on the extension seat (12), and the cross-sectional shape of the second mounting post (734) is the same as that of the mounting post (730), and the upper shell (2) is provided with a second mounting groove (735) for inserting the second mounting post (734), and the second mounting post (734) is inserted into the second mounting groove (735) for limited engagement.

18. The molded case circuit breaker according to claim 17, characterized in that: The extension seat (12) includes an extension portion (121) and two extension partitions (122) respectively provided for each phase pole unit. Two adjacent phase pole units share one extension partition (122). A second connection hole (123) for passing a second screw is provided on the inner side of the extension partition (122). The second connection hole (123) is located at the bottom side of the extension portion (121) away from the opening of one end of the extension cover (13). The extension cover (13) is provided with a second screw hole for connecting the second screw. The second screw passes through the extension seat (12) from the second connection hole (123) and is connected to the extension cover (13).

19. The molded case circuit breaker according to claim 17, wherein: The number of the extension seats (12) and the extension covers (13) corresponds to the number of the phase pole units; a plurality of extension seats (12) are integrally formed, and a plurality of extension covers (13) are integrally formed.

20. The molded case circuit breaker according to claim 13, wherein: The exhaust hole (71) of the extension seat (12) and the exhaust hole (71) on the base (11) have the same structure, and a detachable arc isolation screen (711) is provided in the exhaust hole (71).

21. The molded case circuit breaker according to claim 20, characterized in that: The extension seat (12) and the base (11) are respectively provided with at least two slots (712) arranged opposite to each other at the position of the exhaust hole (71), each slot (712) is formed by two first mounting ribs (713), and the two side edges of the arc isolation mesh plate (711) can be respectively inserted into the two slots (712) for positioning.

22. The molded case circuit breaker according to claim 3, characterized in that: The arc extinguishing chamber (6) comprises two extension seats (12), the two extension seats (12) being arranged at two ends of the base (11) in a direction of the length of the housing relative to each other, the arc extinguishing chamber (6) comprising two second arc extinguishing portions (62) corresponding to the two extension seats (12), the two second arc extinguishing portions (62) being arranged at two ends of the first arc extinguishing portion (61) in a direction of the length of the housing relative to each other, and the two second arc extinguishing portions (62) being respectively used for being inserted into the corresponding extension seats (12).

23. The molded case circuit breaker according to claim 12, wherein: The movable contact (51) is provided with a baffle (511) in an arcuate shape. When the movable contact (51) moves in a direction away from the static contact (53), the baffle (511) is used to block one end of the contact hole (22) close to the static contact (53).

24. The molded case circuit breaker according to claim 4, characterized in that: The length of the arc-extinguishing grid (63) at the protruding structure (66) is greater than the length of the other arc-extinguishing grids (63) in the first arc-extinguishing portion (61), and is also greater than the length of the arc-extinguishing grid (63) in the second arc-extinguishing portion (62).

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