A high current modular molded case circuit breaker

Abstract

The invention discloses a large-current modular molded case circuit breaker, comprising a shell, an arc extinguishing assembly, a contact assembly, a rotating shaft and an operating mechanism; the shell comprises a base, an upper cover and a cover, the operating mechanism and the rotating shaft are both detachably mounted on the top of the upper cover, and a plurality of groups of moving contacts and a plurality of groups of static contacts are respectively detachably mounted in a receiving cavity between the base and the upper cover, the rotating shaft is movably connected with the plurality of groups of moving contacts and the operating mechanism through a crank arm structure, and the molded case circuit breaker adopting the technical solution realizes modularization and convenient installation of the operating mechanism, the rotating shaft and the moving contact through reasonable optimization layout and design of components such as the operating mechanism, the rotating shaft and the moving contact, simplifies the installation structure, reduces the installation difficulty, is convenient for product disassembly, assembly and maintenance, saves assembly time, improves assembly efficiency, reduces production costs, and is conducive to mass production and assembly of products.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to a high-current modular molded case circuit breaker. Background Art

[0002] Molded case circuit breakers have long-delay overload and short-circuit instantaneous protection functions. In low-voltage power distribution systems, they are often used as terminal switches or branch switches, replacing the fuses and knife switches commonly used in the past. Molded case circuit breakers can automatically cut off the current after the current exceeds the trip setting. The molded case refers to the use of plastic insulators as the outer shell of the device to isolate the conductors and the grounded metal parts. There are terminals at both ends of the molded case circuit breaker. The static contact is used to connect the terminal and the moving contact, thereby realizing the passage of the entire circuit breaker.

[0003] Common molded case circuit breakers on the market mainly include a contact mechanism, a rotating shaft, an operating mechanism, an arc extinguishing device, etc. arranged in the shell. The shell is assembled by a base, an upper cover and a top cover. For details, please refer to a molded case circuit breaker disclosed in Chinese patent document CN118098895A, including a base, an upper cover, a top cover, an operating mechanism, a rotating shaft, a moving contact, a static contact, an arc isolation cover and an arc extinguishing chamber. Since the molded case circuit breaker adopts a three-phase line structure, three contact grooves for accommodating three moving contacts, three static contacts and three arc extinguishing chambers are arranged inside the base. The rotating shaft is arranged in the base and can be rotatably arranged relative to the base. The rotating shaft has three moving contact mounting sections corresponding to the three contact grooves, so that the three moving contacts are respectively mounted on the same rotating shaft to realize synchronous rotation. The operating mechanism is fixed on the base, and the lower connecting rod of the operating mechanism is connected to the rotating shaft, so as to realize the operation. The operating mechanism controls the rotation of the rotating shaft, and then the rotating shaft drives the three moving contacts to rotate to realize contact with the three static contacts to close or open the switch. Combined with the drawings of the document, it can be seen that the operating mechanism, rotating shaft, moving contact, static contact, arc isolation cover and arc extinguishing chamber are all installed in the internal space formed between the base and the upper cover. In particular, the installation structure of the three parts of the moving contact, rotating shaft and operating mechanism is too complicated and tight. After the three moving contacts are assembled to the rotating shaft, for the replacement and adjustment of any phase moving contact, it is necessary to disassemble the middle cover and remove the entire operating structure and the rotating shaft for replacement operation. The installation and maintenance are extremely inconvenient, the assembly efficiency is low, the installation structure is complicated, and the production cost is increased. It can be seen that the existing molded case circuit breaker is limited by its own structure and is not conducive to the development in the direction of modularization and convenient assembly, which makes it difficult to achieve independent modular assembly of various components and mechanisms of the circuit breaker, affecting product installation and production. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problem that the installation structure of the three parts of the moving contact, rotating shaft and operating mechanism of the molded case circuit breaker in the prior art is too complicated, the installation and maintenance are inconvenient, the assembly efficiency is low, the production cost is increased, and it is not conducive to the development of the circuit breaker towards modular assembly.

[0005] In order to solve the above technical problems, the present invention provides a large current modular molded case circuit breaker, comprising a housing, an arc extinguishing assembly, a contact assembly, a rotating shaft and an operating mechanism; the housing comprises a base, an upper cover and a cover, an accommodating cavity for accommodating the arc extinguishing assembly and the contact assembly is formed between the base and the upper cover, the contact assembly comprises a plurality of groups of stationary contacts and a plurality of groups of moving contacts sequentially arranged in the accommodating cavity along a first direction, and the plurality of groups of moving contacts are respectively rotatably arranged in the accommodating cavity relative to the plurality of groups of stationary contacts;

[0006] The operating mechanism is detachably arranged on the top of the upper cover, and comprises a mechanism bracket fixed to the upper cover, and a mechanism transmission component and a mechanism release component arranged on the mechanism bracket;

[0007] The rotating shaft is rotatably arranged between the mechanism bracket and the top of the upper cover and extends a set distance along the first direction. The top of the upper cover is provided with a plurality of connecting windows connected to the accommodating cavity corresponding to the plurality of groups of moving contacts. The plurality of groups of moving contacts respectively have contact arms extending through the plurality of connecting windows. The rotating shaft includes a crank arm structure that is detachably connected to the mechanism transmission assembly and the contact arm respectively. When the operating mechanism drives the rotating shaft to rotate, it drives the plurality of groups of moving contacts to perform closing or opening actions.

[0008] In the above-mentioned high-current modular molded case circuit breaker, the crank arm structure includes a first crank arm fixedly sleeved on the rotating shaft and hingedly connected to the contact arm, and a second crank arm fixedly sleeved on the rotating shaft and hingedly connected to the mechanism transmission assembly, and the multiple connecting windows include a plurality of give-way grooves correspondingly arranged on the movement path of the first crank arm and / or the second crank arm.

[0009] In the above-mentioned high-current modular molded case circuit breaker, the mechanism transmission assembly includes a lower connecting rod hinged to the second crank arm, the first crank arm and the second crank arm are respectively hinged to the lower connecting rod and the contact arm through a pin shaft structure, and a pin hole structure for penetrating the pin shaft structure is respectively provided between the first crank arm and the contact arm and between the second crank arm and the lower connecting rod.

[0010] In the above-mentioned high-current modular molded case circuit breaker, the mechanism bracket is detachably connected to the upper cover, and two opposite side plates of the mechanism bracket are provided with two opposite shaft support plates, and the two shaft support plates are oppositely provided with two through holes for the shaft to pass through, and the shaft can be rotatably passed through the two shaft support plates, and the first direction is the axial direction of the shaft.

[0011] In the above-mentioned high-current modular molded case circuit breaker, the accommodating cavity includes three interphase slots spaced between the base and the upper cover, and three incoming conductive plates and three outgoing conductive plates are respectively provided in the three interphase slots, three groups of static contacts are formed on the three incoming conductive plates, and three outgoing conductive plates are connected to three groups of moving contacts; the incoming conductive plate together with the static contact is inserted into the corresponding interphase slot from one end of the base, and a first stopper is provided at one end of the interphase slot to limit the pressing of the incoming conductive plate, and a first fastening structure is provided between the incoming conductive plate and the bottom of the base.

[0012] In the above-mentioned large current modular molded case circuit breaker, the arc extinguishing assembly includes three arc extinguishing chambers inserted into three interphase slots from one end of the base; the arc extinguishing chambers are connected to the incoming conductive plate and arranged close to the moving contact and the static contact, and the inner wall of the interphase slot is provided with a limiting boss that forms a limiting match with the front end of the arc extinguishing chamber, and an arc isolation baffle is provided at one end of the interphase slot to resist the rear end of the arc extinguishing chamber, and a plurality of exhaust holes are provided on the arc isolation baffle.

[0013] In the above-mentioned large current modular molded case circuit breaker, each group of moving contacts includes a contact bracket fixedly connected to the outlet conductive plate, a contact cover rotatably connected to the contact bracket, and a plurality of moving contact pieces arranged in the contact cover and a plurality of contact springs arranged between the contact cover and the plurality of moving contact pieces. The top of the contact cover is provided with a contact arm protruding upward and connected to the crank arm structure. The plurality of moving contact pieces are connected to the outlet conductive plate through a soft connection. The other end of the interphase slot is provided with a second stopper that presses against the outlet conductive plate. A second fastening structure is provided between the outlet conductive plate and the bottom of the base.

[0014] The above-mentioned high-current modular molded case circuit breaker also includes three mutual inductor devices sleeved on the three outgoing line conductive plates, and a controller arranged on the top of the upper cover and located on one side of the operating mechanism. The top of the upper cover is correspondingly provided with three mounting grooves connecting the three phase grooves. The controller is located above the left mounting groove, so that the detection lines of the three mutual inductor devices extend to connect the controller.

[0015] In the above-mentioned high-current modular molded case circuit breaker, the mechanism trip assembly includes a trip rod rotatably arranged on a mechanism bracket, the trip rod is located above three mounting slots, and has three trip plates extending through the three mounting slots, and a main trip device electrically connected to the controller is provided in the middle mounting slot, and the main trip device is arranged opposite to one of the trip plates.

[0016] In the above-mentioned high-current modular molded case circuit breaker, an accessory device located on the other side of the operating mechanism is also provided on the top of the upper cover, and the accessory device includes a first accessory body provided with a first accessory slot and a second accessory body provided with a second accessory slot, and an accessory push rod located on the motion path of the crank structure is rotatably provided on the first accessory body, and the accessory push rod includes two rotating arms rotatably provided on the side walls of both sides of the first accessory body and a push rod body connected between the two rotating arms, and the push rod body is located below the first accessory slot, and an auxiliary contact device cooperating with the accessory push rod is provided in the first accessory slot, and a shunt tripping device cooperating with the tripping plate is provided in the second accessory slot.

[0017] The technical solution of the present invention has the following advantages compared with the prior art:

[0018] 1. In the high-current modular molded case circuit breaker provided by the present invention, the operating mechanism and the rotating shaft are both detachably mounted on the top of the upper cover, and the multiple groups of moving contacts are detachably mounted in the accommodating cavity between the base and the upper cover. The rotating shaft is movably connected with the contact arms of the multiple groups of moving contacts through a crank arm structure, and is movably connected with the operating mechanism through the crank arm structure. With this structural arrangement, when installing and replacing the moving contacts, it is only necessary to disassemble and disconnect the connection between the contact arm and the rotating shaft, and then open the upper cover to replace any group of moving contacts separately, so that there is no need to disassemble the operating mechanism and the rotating shaft installed on the upper cover. Similarly, the operating mechanism installed on the upper cover can also be disassembled. The operating mechanism or the rotating shaft can be independently installed and replaced without disassembling the upper cover and will not affect the contact assembly. Such operating mechanism and the rotating shaft do not occupy the space of the accommodating cavity, but are reasonably installed by utilizing the space at the top of the upper cover. The molded case circuit breaker adopting the technical solution realizes the effect of modularization and convenient installation between the operating mechanism, the rotating shaft and the moving contact through reasonable optimization layout and design of components such as the operating mechanism, the rotating shaft and the moving contact, simplifies the installation structure, reduces the installation difficulty, is very convenient for product disassembly, assembly and maintenance, saves assembly time, improves assembly efficiency, reduces production costs, is conducive to mass production and assembly of products, and thus enhances the market competitiveness of products.

[0019] 2. In the high-current modular molded case circuit breaker provided by the present invention, this molded case circuit breaker not only realizes the modular installation between the operating mechanism, the rotating shaft and the moving contact, but also realizes the modular installation of components such as the static contact, the arc extinguishing chamber, the controller and the accessory device, so that the molded case circuit breaker can achieve the effect of modular and standardized assembly, which is convenient and quick to install and improves the installation efficiency.

[0020] 3. In the high-current modular molded case circuit breaker provided by the present invention, the main tripper is installed in the middle installation groove on the top of the upper cover, and the tripping rod has a tripping plate that extends into the middle installation groove and cooperates with the main tripper. This main tripper not only meets its own installation position requirements by rationally utilizing the position space of the installation groove, but also reduces the installation height, and achieves installation and coordination with the tripping rod. The installation structure is more compact and easy to install and disassemble. With this structural setting, when a circuit overload, loss of pressure, undervoltage or short circuit fault is detected, the controller will control the main tripper to operate, and the main tripper pushes the tripping plate to drive the tripping rod to rotate, thereby triggering the operating mechanism to trip, so as to achieve the tripping and opening of the circuit breaker, and avoid endangering the safety of the staff and the normal operation of the equipment due to circuit faults, thereby ensuring the safety of the line and equipment.

[0021] 4. In the high-current modular molded case circuit breaker provided by the present invention, the accessory device is detachably installed on the top of the upper cover and is located on one side of the operating mechanism, which is convenient for installation and replacement. The accessory device can be used to install other accessory modules such as shunt trip devices and auxiliary contact devices, thereby expanding the use function of the circuit breaker to meet user needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the three-dimensional structure of a high-current modular molded case circuit breaker provided by the present invention;

[0024] Figure 2 It is a schematic cross-sectional structure diagram of a high current modular molded case circuit breaker of the present invention;

[0025] Figure 3 for Figure 1 The schematic diagram of the structure of the molded case circuit breaker behind the hidden cover is shown;

[0026] Figure 4 for Figure 3 The schematic diagram of the structure of the molded case circuit breaker with the controller hidden is shown;

[0027] Figure 5 It is a schematic diagram of the structure of the arc extinguishing chamber, the static contact and the moving contact on the base of the present invention;

[0028] Figure 6 It is a schematic diagram of the installation structure of the moving contact on the base of the present invention;

[0029] Figure 7 It is a schematic diagram of the installation structure between the operating mechanism, the rotating shaft and the accessory device of the present invention;

[0030] Figure 8 for Figure 7 A schematic diagram of the structure of the bottom direction of the accessory device shown.

[0031] Description of reference numerals: 1. housing; 11. base; 12. upper cover; 13. cover; 14. connection window; 15. interphase slot; 16. mounting slot; 17. limiting boss; 2. main release; 3. arc extinguishing chamber; 31. arc isolation baffle; 4. moving contact; 40. outlet conductive plate; 401. second stopper; 41. contact arm; 42. contact bracket; 43. contact cover; 44. moving contact piece; 5. static contact; 50. Incoming conductive plate; 501. First stopper; 6. Rotating shaft; 61. First crank arm; 62. Second crank arm; 63. Pin hole structure; 64. Rotating shaft support plate; 7. Operating mechanism; 71. Mechanism bracket; 72. Lower connecting rod; 73. Tripping rod; 74. Tripping plate; 8. Controller; 9. Accessory device; 91. First accessory body; 92. Second accessory body; 93. Accessory push rod; 10. Transformer device. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms “first”, “second” and “third” are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] Example

[0037] The present embodiment is described in detail below with reference to the accompanying drawings:

[0038] This embodiment provides Figure 1-Figure 8 A high-current modular molded case circuit breaker shown in the figure comprises a housing 1, an arc extinguishing assembly, a contact assembly, a rotating shaft 6 and an operating mechanism 7; wherein the housing 1 comprises a base 11, an upper cover 12 and a cover 13, a receiving chamber for receiving the arc extinguishing assembly and the contact assembly is formed between the base 11 and the upper cover 12, the contact assembly comprises a plurality of groups of stationary contacts 5 and a plurality of groups of moving contacts 4 sequentially arranged in the receiving chamber along a first direction, the plurality of groups of moving contacts 4 are respectively rotatably arranged in the receiving chamber relative to the plurality of groups of stationary contacts 5; the operating mechanism 7 is detachably arranged on the top of the upper cover 12, and comprises a mechanism bracket 71 fixed to the upper cover 12 and a mechanism bracket 71 arranged on the upper cover 12. The mechanism transmission component and the mechanism release component of the mechanism bracket 71; the rotating shaft 6 is rotatably arranged between the mechanism bracket 71 and the top of the upper cover 12 and extends a set distance along the first direction, and the top of the upper cover 12 is provided with a plurality of connecting windows 14 connected to the accommodating cavity corresponding to the plurality of groups of moving contacts 4, and the plurality of groups of moving contacts 4 respectively have contact arms 41 extending through the plurality of connecting windows 14, and the rotating shaft 6 includes a crank arm structure that is detachably connected to the mechanism transmission component and the contact arm 41 respectively, and when the operating mechanism 7 drives the rotating shaft 6 to rotate, it drives the plurality of groups of moving contacts 4 to perform closing or opening actions, thereby driving the moving contacts 4 to contact or separate with the static contacts 5.

[0039] The above-mentioned implementation mode is the core technical solution of this embodiment. The operating mechanism 7 and the rotating shaft 6 are both detachably installed on the top of the upper cover, and the multiple groups of moving contacts 4 are each detachably installed in the accommodating cavity between the base and the upper cover. The rotating shaft 6 is movably connected with the contact arms of the multiple groups of moving contacts through a crank arm structure, and is movably connected with the operating mechanism through the crank arm structure. With this structural arrangement, when installing and replacing the moving contacts, it is only necessary to disassemble and disconnect the connection between the contact arm 41 and the rotating shaft 6, and then open the upper cover to replace any group of moving contacts separately, so there is no need to disassemble the operating mechanism 7 and the rotating shaft 6 installed on the upper cover. Similarly, the operating mechanism installed on the upper cover can also be disassembled. 7 or the rotating shaft 6 can be independently installed and replaced without disassembling the upper cover and will not affect the contact assembly. Such operating mechanism 7 and rotating shaft 6 do not occupy the space of the accommodating cavity, but are reasonably installed by utilizing the space at the top of the upper cover. The molded case circuit breaker adopting the technical solution realizes the modularization and convenient installation effect between the operating mechanism 7, the rotating shaft 6 and the moving contact 4 through reasonable optimization layout and design of components such as the operating mechanism 7, the rotating shaft 6 and the moving contact 4, simplifies the installation structure, reduces the installation difficulty, is very convenient for product disassembly, assembly and maintenance, saves assembly time, improves assembly efficiency, reduces production costs, is conducive to mass production and assembly of products, and thus enhances the market competitiveness of products.

[0040] Combine the following Figure 1-Figure 6 The specific setting method between the rotating shaft, operating mechanism and moving contact is described in detail:

[0041] The crank arm structure includes a first crank arm 61 fixedly sleeved on the rotating shaft 6 and hingedly connected to the contact arm 41, and a second crank arm 62 fixedly sleeved on the rotating shaft 6 and hingedly connected to the mechanism transmission component, and the plurality of connection windows 14 include a plurality of give-way grooves correspondingly arranged on the movement path of the first crank arm 61 and / or the second crank arm 62, referring to Figure 4 The clearance groove is in the shape of a strip and is arranged on the top of the upper cover. By arranging the clearance groove on the top of the upper cover, space can be reserved for the movement of the crank arm, so that the crank arm will not collide with the top of the upper cover during the rotation of the rotating shaft, thereby avoiding position interference between the two; wherein, the mechanism transmission assembly includes a lower connecting rod 72 hinged to the second crank arm 62, the first crank arm 61 and the second crank arm 62 are respectively hinged to the lower connecting rod 72 and the contact arm 41 through a pin structure, and a pin hole structure 63 for penetrating the pin structure is respectively provided between the first crank arm 61 and the contact arm 41 and between the second crank arm 62 and the lower connecting rod 72. With this structural arrangement, the first crank arm 61 and the contact arm 41 are connected to each other. The second crank arm 62 and the lower connecting rod 72 are hingedly connected by a pin structure. Therefore, as long as the pin structure is removed from between the first crank arm 61 and the contact arm 41, the connection between the rotating shaft 6 and the moving contact 4 can be disconnected. Similarly, as long as the pin structure between the second crank arm 62 and the lower connecting rod 72 is removed, the connection between the rotating shaft 6 and the operating mechanism 7 can also be disconnected. This type of rotating shaft 6 can meet the needs of relative movement between the two components and on-site installation by hinged connection with a pin, so that the installation and disassembly between the rotating shaft 6 and the moving contact 4 and the operating mechanism 7 can be quickly realized, which is beneficial to improving assembly efficiency.

[0042] It is further preferred that the mechanism bracket 71 is detachably connected to the upper cover 12, specifically, the mechanism bracket 71 is fixed to the top of the upper cover by fasteners, and two opposite side panels of the mechanism bracket 71 are provided with two opposite shaft support plates 64, and the two shaft support plates 64 are oppositely provided with two through holes for the shaft 6 to pass through, and the shaft 6 can be rotatably passed through the two shaft support plates 64, and the first direction is the axial direction of the shaft 6. Such an installation design realizes the rotation setting of the shaft 6 on the mechanism bracket 71.

[0043] In the present embodiment, the molded case circuit breaker preferably adopts a three-phase circuit system, and three sets of moving contacts 4 and three sets of stationary contacts 5 are provided in the accommodating cavity of the housing 1. As a preferred implementation, Figure 1-Figure 4As shown, the accommodating cavity includes three interphase slots 15 arranged between the base 11 and the upper cover 12, and three incoming conductive plates 50 and three outgoing conductive plates 40 are respectively arranged in the three interphase slots 15, three groups of static contacts 5 are formed on the three incoming conductive plates 50, and three groups of moving contacts 4 are connected to the three outgoing conductive plates 40, and the interphase creepage distance can be ensured by the three interphase slots. It is further preferably arranged that the incoming conductive plate 50 together with the static contact 5 is inserted into the corresponding interphase slot 15 from one end of the base 11, and a first stopper 501 is provided at one end of the interphase slot 15 to limit the pressure on the incoming conductive plate 50, and a first fastening structure is arranged between the incoming conductive plate 50 and the bottom of the base 11, and the first fastening structure adopts a screw structure, and the first stopper 501 can prevent the incoming conductive plate from coming out of the interphase slot to play a role in limiting installation, and finally it can be fixed by screws. The static contact 5 of this structural arrangement can be installed and disassembled at one end of the base 11. For example, when disassembly is required, the screw structure fixing the incoming conductive plate 50 is first loosened, and then the first stopper 501 is removed from one end of the base 11. In this way, the incoming conductive plate 50 together with the static contact 5 can be taken out from the interphase slot 15 and installed and replaced. In this way, the installation operation does not need to remove the upper cover, the base and the moving contact and other components inside it, which is beneficial to the maintenance and repair and mass production and assembly of the circuit breaker products, and improves the installation efficiency.

[0044] Combination Figure 5-Figure 6As shown, each group of moving contacts 4 includes a contact bracket 42 fixedly connected to the outlet conductive plate 40, a contact cover 43 rotatably connected to the contact bracket 42, and a plurality of moving contact pieces 44 arranged in the contact cover 43 and a plurality of contact springs arranged between the contact cover 43 and the plurality of moving contact pieces 44, the top of the contact cover 43 is provided with a contact arm 41 protruding upward and connected to the crank arm structure, the plurality of moving contact pieces 44 are connected to the outlet conductive plate 40 through a soft connection, the other end of the interphase slot 15 is provided with a second stopper 401 that presses against the outlet conductive plate 40, and a second fastening is provided between the outlet conductive plate 40 and the bottom of the base 11 Structure, the second fastening structure is preferably a screw structure, the three groups of moving contacts 4 are respectively assembled with the three incoming conductive plates 50 into an integral structure, and are separately installed in the three interphase slots. The moving contacts are multiple moving contact pieces 44 designed in parallel to achieve contact with the static contact 5. This design is beneficial to reduce temperature rise and increase the current-carrying area. When the total electric repulsion force remains unchanged, the current value and the electric repulsion force borne by each moving contact piece 44 are reduced. At the same time, the contact area between the moving and static contacts is increased, and the contact resistance is reduced, thereby reducing the current density of the main circuit, improving the current carrying capacity, meeting the passage of large currents, and improving the electrical service life of the product. It should be noted that the molded case circuit breaker of this embodiment adopts a three-phase line system. Therefore, the three groups of moving contacts 4 are respectively A-phase moving contacts, B-phase moving contacts and C-phase moving contacts. The rotating shaft 6 includes two first crank arms 61 and a second crank arm 62. The contact arms of the A-phase moving contacts and the C-phase moving contacts are respectively hinged to the two first crank arms 61, and the contact arms of the B-phase moving contacts and the lower connecting rod of the operating mechanism 7 are respectively hinged to the second crank arm 62. In this way, the crank arm setting can be reduced, and the structural design The arrangement is reasonable, which is conducive to reducing costs. When the operating mechanism 7 is in the closing or opening action, the lower connecting rod 72 drives the rotating shaft 6 to close or open the switch, and then the rotating shaft 6 drives the three groups of moving contacts 4 to move synchronously through multiple crank arms, so as to realize the contact or separation of the three groups of moving contacts 4 and the three groups of static contacts 5; of course, the molded case circuit breaker of this embodiment can also adopt a three-phase four-wire system, that is, four groups of moving contacts and four groups of static contacts are correspondingly arranged to meet the configuration requirements, and other equivalent implementation methods will not be described one by one here.

[0045] Combination Figure 1-Figure 6As shown, the arc extinguishing assembly includes three arc extinguishing chambers 3 inserted into three interphase slots 15 from one end of the base 11. Specifically, the arc extinguishing chambers 3 are connected to the incoming conductive plate 50 and are arranged close to the moving contact 4 and the static contact 5. The front end of the arc extinguishing chamber 3 is provided with an arc-striking opening facing the moving and static contacts. The inner wall of the interphase slot 15 is provided with a limiting boss 17 that forms a limiting match with the front end of the arc extinguishing chamber 3. An arc isolation baffle 31 is provided at one end of the interphase slot 15 to block the rear end of the arc extinguishing chamber 3. The arc isolation baffle 31 is provided with a plurality of exhaust holes. The arc extinguishing chamber uses metal grids arranged in a stacked manner to cut the arc. When a large current is interrupted between the moving and static contacts to generate an arc, the arc will be pulled between multiple metal grids under the contraction force of the magnetic lines of force, dividing a long arc into multiple short arcs, playing a role in arc cooling, and also cooling and deionizing the arc extinguishing gas, thereby achieving an arc extinguishing effect. Finally, the gas after arc extinguishing is discharged out of the circuit breaker through the exhaust hole. This structural setting, after the arc extinguishing chamber 3 is installed into the interphase slot 15 from one end of the base 11, the arc isolation baffle 31 is fixed at one end of the interphase slot 15, so that the arc extinguishing chamber 3 in the interphase slot 15 can be installed to limit the position, so as to prevent the arc extinguishing chamber 3 from escaping from the interphase slot 15, thereby realizing the independent installation of the arc extinguishing chamber 3 in the interphase slot 15, and also realizing independent disassembly, just need to remove the arc isolation baffle 31 first, and then take out the arc extinguishing chamber 3, the whole installation and disassembly process does not need to remove the upper cover 12 and the base 11, simplifying the installation structure and improving the installation efficiency. The molded case circuit breaker adopting this technical solution not only realizes the modular assembly between the operating mechanism 7, the rotating shaft 6 and the moving contact 4, but also realizes the modular assembly between the static contact 5 and the arc extinguishing chamber 3, so that the molded case circuit breaker can achieve the effect of modular and standardized assembly, and the installation is convenient and fast, and the installation efficiency is improved.

[0046] The molded case circuit breaker provided in this embodiment also includes three mutual inductor devices 10 sleeved on three outgoing conductive plates 40, and a controller 8 arranged on the top of the upper cover 12 and located on one side of the operating mechanism 7. The top of the upper cover 12 is correspondingly provided with three mounting grooves 16 connected to the three interphase grooves 15, and lead grooves are provided between the three mounting grooves 16. The controller 8 is located above the left mounting groove 16, so that the detection circuits of the three mutual inductor devices 10 are extended to connect the controller 8. In this way, installation and wiring are convenient, and the connection distance is shortened. The current information of the three-phase line of the circuit breaker can be detected through the three mutual inductor devices 10.

[0047] As a preferred embodiment, the operating mechanism 7 includes a mechanism transmission assembly consisting of a handle, a lever, an upper connecting rod, a lower connecting rod 72, a main tension spring, a jump catch, a lock catch, and a re-fastener. The lever, the jump catch, and the lock catch are rotatably arranged on the mechanism bracket 71 respectively. The handle is connected to the lever. One end of the upper connecting rod is rotatably arranged with the jump catch. The lower connecting rod and the upper connecting rod are hinged through a hinge shaft. The two ends of the main tension spring are respectively connected to the lever and the hinge shaft. The lock catch and the jump catch remain locked when the operating mechanism 7 is in a closed state. The lower connecting rod 72 is hingedly connected to the rotating shaft 6, thereby realizing that the operating mechanism 7 controls the rotation of the rotating shaft 6. In addition, combined with Figure 2 and Figure 5 As shown, the mechanism tripping assembly includes a tripping rod 73 rotatably arranged on a mechanism bracket 71, and the tripping rod cooperates with the tripping latch. When the operating mechanism is in the closed state, once the tripping rod 73 is triggered to rotate, it will trigger the operating mechanism 7 to perform a tripping and opening operation, so that the operating mechanism 7 is switched from the closed state to the tripping and opening state. As a specific structural setting, the tripping rod 73 is located above the three mounting grooves 16, and has three tripping plates 74 extending through the three mounting grooves 16. A main tripper 2 electrically connected to the controller 8 is provided in the middle mounting groove 16. The main tripper 2 is arranged opposite to one of the tripping plates 74, and specifically, the push rod of the main tripper 2 is opposite to the tripping plate 74. This main tripper 2 meets its own installation position requirements by reasonably utilizing the position space of the mounting groove 16, while reducing the installation height, so as to achieve installation in cooperation with the tripping rod 73, and the installation structure is more compact and convenient for installation and disassembly. With this structural setting, when a circuit fault such as overload, loss of voltage, undervoltage or short circuit is detected, the controller 8 will control the main trip device 2 to operate, and push the trip plate 74 through the main trip device 2 to drive the trip rod 73 to rotate, thereby triggering the operating mechanism 7 to trip and open the circuit breaker, so as to avoid endangering the safety of the staff and the normal operation of the equipment due to circuit faults, thereby ensuring the safety of the lines and equipment.

[0048] In this embodiment, the top of the upper cover 12 is further provided with an accessory device 9 located on the other side of the operating mechanism 7, and the rotating shaft 6 extends and connects between the accessory device 9, the operating mechanism 7 and the controller 8. Figure 7-Figure 8The accessory device 9 includes a first accessory body 91 provided with a first accessory slot and a second accessory body 92 provided with a second accessory slot. The first accessory body 91 is rotatably provided with an accessory push rod 93 located on the movement path of the crank arm structure. The accessory push rod 93 includes two rotating arms rotatably provided on the side walls of both sides of the first accessory and a push rod body connected between the two rotating arms. Specifically, the push rod body is located on the movement path of one of the first crank arms 61, and the push rod body is located below the first accessory slot. An auxiliary contact device or an auxiliary switch device that cooperates with the accessory push rod 93 is provided in the first accessory slot. The bottom of the first accessory body 91 is a bottom opening that is connected to the first accessory slot, so that the auxiliary contact device or the auxiliary switch can cooperate with the accessory push rod 93 through the bottom opening position. When the rotating shaft 6 is opened and closed, the crank structure cooperates with the accessory push rod to drive the auxiliary contact device or the auxiliary switch to perform corresponding actions, so that the auxiliary contact device or the auxiliary switch can detect the opening and closing signals of the circuit breaker or control the on and off functions of the secondary electrical circuit; in addition, the second accessory slot is provided with a shunt tripping device (the auxiliary contact device and the shunt tripping device are not shown in the accompanying drawings) that cooperates with the tripping plate 74. The shunt tripping device cooperates with the tripping rod 73 to achieve the purpose of remote control of the circuit breaker to achieve tripping and opening. The shunt tripping device can be used in conjunction with external devices such as a fire control room. When the fire control room sends an electrical signal to the shunt tripping device, the shunt tripping device drives the tripping rod 73 to rotate, thereby controlling the molded case circuit breaker to trip. The accessory device 9 of this embodiment can be installed with other accessory modules such as shunt tripping device, auxiliary contact device, auxiliary switch, etc. according to the user's use requirements, so as to expand the use functions and requirements of the circuit breaker, and this accessory device is detachably installed on the top of the upper cover, which is convenient for installation and replacement. The molded case circuit breaker using this technical solution realizes modular installation and disassembly of components such as operating mechanism 7, rotating shaft 6, moving contact 4, static contact 5, arc extinguishing chamber 3, controller 8 and accessory device 9, which is convenient for installation and maintenance work, so that the production, sales and maintenance of the product can achieve modular and convenient effects, improve installation efficiency and reduce production costs.

[0049] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A high current modular molded case circuit breaker, comprising a housing (1), an arc extinguishing assembly, a contact assembly, a rotating shaft (6) and an operating mechanism (7); characterized in that: The housing (1) comprises a base (11), an upper cover (12) and a cover (13); a receiving chamber for receiving an arc extinguishing assembly and a contact assembly is formed between the base (11) and the upper cover (12); the contact assembly comprises a plurality of groups of stationary contacts (5) and a plurality of groups of moving contacts (4) which are sequentially arranged in the receiving chamber at intervals along a first direction; the plurality of groups of moving contacts (4) are respectively rotatably arranged in the receiving chamber relative to the plurality of groups of stationary contacts (5); The operating mechanism (7) is detachably arranged on the top of the upper cover (12), and comprises a mechanism bracket (71) fixed to the upper cover (12), and a mechanism transmission component and a mechanism release component arranged on the mechanism bracket (71); The rotating shaft (6) is rotatably arranged between the mechanism bracket (71) and the upper cover (12) and extends a set distance in a first direction; a plurality of connection windows (14) communicating with the accommodating chamber are provided on the top of the upper cover (12) corresponding to the plurality of groups of moving contacts (4); the plurality of groups of moving contacts (4) respectively have contact arms (41) extending through the plurality of connection windows (14); the rotating shaft (6) comprises a crank arm structure detachably connected to the mechanism transmission assembly and the contact arm (41) respectively; when the operating mechanism (7) drives the rotating shaft (6) to rotate, it drives the plurality of groups of moving contacts (4) to perform a closing or opening action; The crank arm structure comprises a first crank arm (61) fixedly sleeved on the rotating shaft (6) and hingedly connected to the contact arm (41), and a second crank arm (62) fixedly sleeved on the rotating shaft (6) and hingedly connected to the mechanism transmission component, and the plurality of connection windows (14) comprise a plurality of clearance grooves correspondingly arranged on the movement path of the first crank arm (61) and / or the second crank arm (62).

2. A high current modular molded case circuit breaker according to claim 1, characterized in that: The mechanism transmission assembly comprises a lower connecting rod (72) hinged to the second crank arm (62); the first crank arm (61) and the second crank arm (62) are respectively hinged to the lower connecting rod (72) and the contact arm (41) via a pin structure; and pin hole structures (63) for penetrating the pin structure are respectively provided between the first crank arm (61) and the contact arm (41) and between the second crank arm (62) and the lower connecting rod (72).

3. A high current modular molded case circuit breaker according to claim 2, characterized in that: The mechanism bracket (71) is detachably connected to the upper cover (12); two side plates of the mechanism bracket (71) are provided with two opposite rotating shaft support plates (64); the two rotating shaft support plates (64) are provided with two opposite through holes for the rotating shaft (6) to pass through; the rotating shaft (6) is rotatably passed through the two rotating shaft support plates (64); and the first direction is the axial direction of the rotating shaft (6).

4. A high current modular molded case circuit breaker according to claim 1, characterized in that: The accommodating cavity comprises three interphase slots (15) arranged at intervals between the base (11) and the upper cover (12), and three incoming conductive plates (50) and three outgoing conductive plates (40) are respectively arranged in the three interphase slots (15), three groups of stationary contacts (5) are formed on the three incoming conductive plates (50), and three groups of moving contacts (4) are connected to the three outgoing conductive plates (40); the incoming conductive plates (50) together with the stationary contacts (5) are inserted from one end of the base (11) into the corresponding interphase slots (15), one end of the interphase slots (15) is provided with a first stopper (501) for limiting the position of the incoming conductive plates (50), and a first fastening structure is arranged between the incoming conductive plates (50) and the bottom of the base (11).

5. A high current modular molded case circuit breaker according to claim 4, characterized in that: The arc extinguishing assembly comprises three arc extinguishing chambers (3) inserted into three interphase slots (15) from one end of a base (11); the arc extinguishing chambers (3) are connected to an incoming line conductive plate (50) and are arranged close to a moving contact (4) and a stationary contact (5); the inner wall of the interphase slot (15) is provided with a limiting boss (17) which forms a limiting match with the front end of the arc extinguishing chamber (3); an arc isolation baffle (31) which abuts against the rear end of the arc extinguishing chamber (3) is provided at one end of the interphase slot (15); and a plurality of exhaust holes are provided on the arc isolation baffle (31).

6. A high current modular molded case circuit breaker according to claim 4, characterized in that: Each group of moving contacts (4) comprises a contact support (42) fixedly connected to an outlet conductive plate (40), a contact cover (43) rotatably connected to the contact support (42), a plurality of moving contact pieces (44) arranged in the contact cover (43), and a plurality of contact springs arranged between the contact cover (43) and the plurality of moving contact pieces (44); a contact arm (41) protruding upward and hingedly connected to a crank structure is provided at the top of the contact cover (43); the plurality of moving contact pieces (44) are connected to the outlet conductive plate (40) through a flexible connection; a second stopper (401) for pressing against the outlet conductive plate (40) is provided at the other end of the interphase slot (15); and a second fastening structure is provided between the outlet conductive plate (40) and the bottom of the base (11).

7. A high current modular molded case circuit breaker according to any one of claims 4 to 6, characterized in that: The invention also comprises three mutual inductor devices (10) sleeved on three outgoing line conductive plates (40), and a controller (8) arranged on the top of the upper cover (12) and located on one side of the operating mechanism (7); the top of the upper cover (12) is provided with three mounting grooves (16) corresponding to the three interphase grooves (15); the controller (8) is located above the left mounting groove (16), so that the detection circuits of the three mutual inductor devices (10) are extended to connect to the controller (8).

8. A high current modular molded case circuit breaker according to claim 7, characterized in that: The mechanism tripping assembly comprises a tripping rod (73) rotatably arranged on a mechanism bracket (71), the tripping rod (73) being located above three mounting slots (16) and having three tripping plates (74) extending through the three mounting slots (16), a main tripping device (2) electrically connected to the controller (8) being arranged in the middle mounting slot (16), the main tripping device (2) being arranged opposite to one of the tripping plates (74).

9. A high current modular molded case circuit breaker according to claim 1, characterized in that: The top of the upper cover (12) is also provided with an accessory device (9) located on the other side of the operating mechanism (7), and the rotating shaft (6) extends and is connected between the accessory device, the operating mechanism and the controller. The accessory device (9) includes a first accessory body (91) provided with a first accessory slot and a second accessory body (92) provided with a second accessory slot. The first accessory body (91) is rotatably provided with an accessory push rod (93) located on the movement path of the crank structure. The accessory push rod (93) includes two rotating arms rotatably provided on the side walls of both sides of the first accessory body and a push rod body connected between the two rotating arms. The push rod body is located below the first accessory slot. The first accessory slot is provided with an auxiliary contact device that cooperates with the accessory push rod (93), and the second accessory slot is provided with a shunt tripping device that cooperates with the tripping plate (74).

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