A modular assembled DC frame circuit breaker

Abstract

The present invention is a modular assembled DC frame circuit breaker, comprising a single-pole housing, a moving and static contact system arranged in the single-pole housing, at least one tripping device being arranged on one side of the moving and static contact system, the moving and static contact system comprising a moving contact assembly and a static contact assembly, the moving contact assembly comprising an arc shield and a contact support, a mounting area being formed between the arc shield and the contact support for placing the moving contact, the moving contact comprising an active contact group and an auxiliary contact group, the auxiliary contact group being located between the active contact groups, the active contact group being coaxially arranged with the auxiliary contact group, baffles being arranged on both outer sides of the active contact group, a rotating shaft hole being formed at one end of the baffle away from the moving contact, a rotating shaft being arranged between the rotating shaft holes for driving the moving contact assembly to disconnect or close. The present invention adopts a single-pole housing structure to realize modularization, which is superior to the cost of opening an integral mold and is more conducive to the realization of assembling multiple poles.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of switchgear, and in particular to a modular assembled DC frame circuit breaker. Background Art

[0002] A frame circuit breaker is a mechanical switch that can connect, carry and disconnect current under normal circuit conditions, and can also connect, carry a certain time and disconnect current under specified abnormal circuit conditions. Frame circuit breakers are used to distribute electric energy and protect lines and power equipment from overload, undervoltage, short circuit, etc. Intelligent frame circuit breakers are suitable for distribution networks with AC 50 Hz, rated voltage 380 volts and 660 volts, and rated current of 200 amperes to 6,300 amperes. They are mainly used to distribute electric energy and protect lines and power equipment from overload, undervoltage, short circuit, single-phase grounding and other faults. The circuit breaker has a variety of intelligent protection functions, can achieve selective protection, has precise action, avoids unnecessary power outages, and improves power supply reliability. Under normal conditions, it can be used for infrequent line conversion. Circuit breakers below 1,250 amperes can be used to protect motors from overload and short circuit in networks with AC 50 Hz and rated voltage 380 volts. Under normal conditions, they can also be used for infrequent starting of motors.

[0003] Although the existing DC frame circuit breakers can meet the needs of the power system to a certain extent, there are still some problems and shortcomings. First of all, traditional DC frame circuit breakers are usually manufactured with integral molds. The DC frame circuit breakers on the market are now multi-pole series-connected, which uses multi-pole series connection to achieve arc extinguishing and improve the performance of breaking capacity. This method is indeed feasible, but the cost is high and it is not conducive to large-scale production and use. In addition, the design and structure of the existing DC frame circuit breakers also have certain limitations, and it is impossible to achieve higher breaking capacity and better circuit protection effects. Therefore, how to design a new type of DC frame circuit breaker to solve the problems and shortcomings of the existing technology is an important issue that needs to be urgently solved in the current fields of power engineering, switchgear, and circuit protection devices. Summary of the invention

[0004] The object of the present invention is to provide a modular assembled DC frame circuit breaker, which reduces the manufacturing cost through the modular assembly structure and is conducive to large-scale production and application.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A modular DC frame circuit breaker comprises a single-pole housing and a moving and static contact system arranged in the single-pole housing, at least one tripping device is arranged on one side of the moving and static contact system, the moving and static contact system comprises a moving contact assembly and a static contact assembly, the moving contact assembly is connected to a moving contact busbar through a soft connection, the static contact assembly is arranged on a terminal board, the moving contact assembly comprises an arc shield and a contact support, an installation area is formed between the arc shield and the contact support for placing a moving contact, the moving contact comprises an active contact group and an auxiliary contact group, the active contact groups are distributed on both sides of the installation area and are arranged at a certain distance, the auxiliary contact group is located between the active contact groups, the active contact group and the auxiliary contact group are arranged coaxially, baffles are arranged on both outer sides of the active contact group, a rotating shaft hole is formed at one end of the baffle away from the moving contact, and a rotating shaft is arranged between the rotating shaft holes for driving the moving contact assembly to disconnect or close.

[0007] In the above technical solution, a single-pole housing structure is used to realize modularization, and it can be assembled according to the needs, which is better than the cost of opening an integral mold and is more conducive to the realization of assembling multiple poles. It can be assembled into two poles, three poles, four poles, and multiple poles; the tripping device can choose an electronic tripping device or an electromagnetic tripping device in the single-pole housing, or a combination of the two, and the combination of the two realizes double protection in a single pole; in addition, the above technical solution optimizes the moving and static contact system, and an auxiliary moving contact is set between the active contact groups to realize the rapid arcing of the arc generated on the moving contact into the arc extinguishing chamber, thereby increasing the breaking capacity and improving the electrical life reliability; in addition, the arc shield is set, which can block the arc in the closed state to prevent the arc from entering the soft connection.

[0008] The present invention is further arranged that the active contact group has a plurality of active contacts arranged side by side, the auxiliary contact has a plurality of auxiliary contacts arranged side by side, the length of the active contact is smaller than the length of the auxiliary contact, a moving silver point 1 is arranged on the active contact, a moving silver point 2 and an auxiliary moving silver point are arranged on the auxiliary contact, the auxiliary moving silver point is far away from the rotating shaft, the moving silver point 1 and the moving silver point 2 are close to the rotating shaft, the rotation path of the moving silver point 1, the rotation path of the moving silver point 2 and the circle where the rotation path of the auxiliary moving silver point is located are concentric circles, and the rotation path of the moving silver point 1 is the same as the rotation path of the moving silver point 2.

[0009] In the above technical solution, the active contact and the auxiliary contact are provided with silver dots to cooperate with the silver dots on the static contact to ensure the reliability and stability during contact.

[0010] The present invention further provides that a spring is provided between the auxiliary contact group, the active contact group and the contact support.

[0011] In the above technical solution, all moving contacts include active contacts and auxiliary contacts, and each moving contact uses two compression springs to contact with the contact support to provide pressure during contact and for the moving contact to rebound quickly during disconnection.

[0012] The present invention further provides that the static contact assembly includes a terminal board and a static contact arranged on the terminal board, the static contact is provided with an auxiliary static silver point and a static silver point, the auxiliary static silver point is in contact with or separated from the auxiliary moving silver point, and the static silver point is in contact with or separated from the moving silver point one and the moving silver point two.

[0013] In the above technical solution, the setting of the static silver point corresponds to the setting of the dynamic silver point and the auxiliary silver point, ensuring the reliability and stability during contact.

[0014] The present invention is further provided that the static contact assembly also includes an arc-striking plate arranged on the static contact, the arc-striking plate includes a mounting portion and an arc-striking portion, the mounting portion is used to connect the static contact and is arranged on a side close to the terminal board, and the arc-striking portion is arranged on the side of the static contact and faces away from the static contact.

[0015] In the above technical solution, the arc starting plate is provided to quickly introduce the arc into the arc extinguishing chamber, thereby improving the breaking capacity.

[0016] The present invention further provides that the tripping device comprises an electronic tripping device and an electromagnetic tripping device, wherein the electronic tripping device and / or the electromagnetic tripping device are arranged in the single-pole housing.

[0017] In the above technical solution, the electronic tripping device is an electronic transformer, which is used to sense current and transmit the induced current to the intelligent control circuit board in the circuit breaker. After calculation, the chip on the circuit board sends a signal to the operating mechanism to achieve tripping; in addition, an electromagnetic tripping device can be used for tripping protection; both can be concentrated in a single-pole housing, or set separately; it is worth mentioning that if it is a DC series structure, a separate setting method is adopted; if not, it can be selected according to the use environment and specific requirements. Set separately or set centrally. In addition, when assembled in multiple levels, the tripping devices between each single-pole housing can be consistent or inconsistent.

[0018] The present invention is further arranged that the electromagnetic tripping device is linked with the operating mechanism in the circuit breaker, and comprises a yoke, a bracket, an armature, a tension spring, and a tripping transmission rod. The yoke is installed on the moving contact wiring busbar, a bracket is arranged outside the yoke, an armature is slidably installed on the bracket, a tension spring is arranged between one end of the armature facing the single-pole housing and the single-pole housing, the tripping transmission rod is fixedly connected with the armature, and a rotating shaft connected to the side of the single-pole housing is formed on the tripping transmission rod. When the instantaneous current of the moving contact wiring busbar exceeds a predetermined value, the yoke generates a force greater than the tension spring force, so that the armature moves in the direction of the yoke. At this time, the tripping transmission rod moves with the armature. Due to the existence of the rotating shaft, one end of the tripping transmission rod linked with the operating mechanism drives the tripping pull plate of the operating mechanism to trip in a rotational manner. After tripping, the yoke loses power, and the armature drives the tripping transmission rod to reset under the action of the tension spring.

[0019] In the above technical solution, the electromagnetic tripping device is used for mechanical tripping and can cooperate with the electronic type for bidirectional protection.

[0020] The present invention is further configured to include an operating mechanism, wherein the operating mechanism includes a mechanism connecting rod, and the mechanism connecting rod includes side plates arranged opposite to each other, the side plates are connected to each other, and connecting blocks are formed on the end surfaces of the side plates, and the connecting blocks are fixed by reinforcing plates.

[0021] In the above technical solution, when the circuit breaker is mechanically operated, due to the damage of mechanical life, and the mechanism connecting rod is riveted in multiple places, there is a risk of the mechanism connecting rod being twisted and not firm enough, and there is a risk of deformation when subjected to large force. If deformed, the operating performance of this mechanism cannot be fully guaranteed. Therefore, in the above technical solution, a reinforcement plate is designed, and a connecting block is formed on the side plate. Two square holes are designed on the reinforcement plate to cooperate with it. After assembly, it is riveted. After riveting, the mechanism connecting rod becomes a complete whole, which improves the defects of distortion and instability.

[0022] The present invention is further provided that an arc extinguishing chamber is also provided in the single-pole housing, and the arc extinguishing chamber is located at the end of the single-pole housing. The arc extinguishing chamber includes an arc extinguishing cover, a partition, and an arc extinguishing grid. The partition is provided on both sides of the arc extinguishing cover and is fixedly connected to the arc extinguishing cover. The arc extinguishing grids are distributed in the area formed between the partitions. The arc extinguishing grids include first-class arc extinguishing grids, second-class arc extinguishing grids and third-class arc extinguishing grids. The second-class arc extinguishing grids are located between the first-class arc extinguishing grids and the third-class arc extinguishing grids. The first-class arc extinguishing grids are used to receive the arc generated on the arc striking plate of the static contact. A plurality of the second-class arc extinguishing grids are provided. The lengths of the second-class arc extinguishing grids are not completely the same, and their ends are not completely located in the same plane. The third-class arc extinguishing grids are used to receive the arc generated by the moving contact.

[0023] In the above technical scheme, the arc extinguishing cover mainly plays two roles: one is the assembly and fixing function, and the other is to strengthen the insulation of the arc extinguishing chamber between multiple poles; the first type of arc extinguishing grid in the arc extinguishing grid serves to receive the arc generated on the arc striking plate of the static contact to achieve rapid arc extinguishing; the third type of arc extinguishing grid specifically cooperates with the arc generated by the auxiliary contact.

[0024] The present invention further provides that the arc extinguishing cover and the arc extinguishing grid are provided with exhaust plates on the gas outlet side, exhaust holes are distributed on the exhaust plates, the exhaust plates are provided with multiple layers and when the exhaust plates are arranged, the exhaust holes between the exhaust plates are staggered.

[0025] In the above technical solution, the exhaust plate is provided with multiple layers, and its distribution position is staggered, that is, the upper and lower positions are not aligned, and the exhaust holes are also staggered, which can ensure that the arc ions are not directly ejected when discharged, thereby achieving the effect of zero arcing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0027] Figure 1 Schematic diagram of the internal structure of an embodiment of the present invention

[0028] Figure 2 This is a schematic diagram of the structure of an electronic sensor used in an embodiment of the present invention.

[0029] Figure 3 The figure is a schematic diagram of the structure of an electromagnetic tripping device adopted in an embodiment of the present invention.

[0030] Figure 4 This is a schematic diagram of the structure of the embodiment of the present invention using double protection.

[0031] Figure 5 It is a schematic structural diagram of a moving contact assembly according to an embodiment of the present invention.

[0032] Figure 6 It is a schematic structural diagram of a moving and static contact system according to an embodiment of the present invention.

[0033] Figure 7 It is a schematic structural diagram of a static contact assembly according to an embodiment of the present invention.

[0034] Figure 8 Schematic diagram of the structure of the auxiliary contact according to an embodiment of the present invention.

[0035] Fig. 9 It is a schematic diagram of the structure of the active contact according to an embodiment of the present invention.

[0036] Fig.10It is a schematic structural diagram of an electromagnetic tripping device according to an embodiment of the present invention.

[0037] Fig.11 It is a side view of the electromagnetic tripping device according to an embodiment of the present invention.

[0038] Fig.12 It is a structural schematic diagram of a mechanism connecting rod in the prior art.

[0039] Fig.13 Schematic diagram of the structure of the connecting rod of the mechanism of the embodiment of the present invention.

[0040] Fig.14 Schematic diagram of explosion of the arc extinguishing chamber according to an embodiment of the present invention.

[0041] Fig.15 It is a cross-sectional view of an arc extinguishing chamber according to an embodiment of the present invention.

[0042] Fig.16 It is a schematic structural diagram of an arc-extinguishing grid according to an embodiment of the present invention.

[0043] Fig.17 It is a schematic structural diagram of another arc-extinguishing grid according to an embodiment of the present invention.

[0044] Reference numerals:

[0045] 10, single-pole housing; 20, tripping device; 30, moving contact assembly; 301, arc shield; 302, contact support; 40, static contact assembly; 401, static contact; 4011, auxiliary static silver point; 4012, static silver point; 402, terminal block; 403, arc-starting plate; 4031, mounting part; 4032, arc-starting part; 50, moving contact busbar; 60, operating mechanism; 601, tripping pull plate; 602, mechanism connecting rod; 6021, side plate; 6022, connecting block; 6023, reinforcement plate; 70, active contact; 701, moving silver point 1; 80, auxiliary contact; 801, moving silver point 2; 802, auxiliary moving Silver dot; 90, baffle; 100, rotating shaft; 110, electronic tripping device; 120, electromagnetic tripping device; 130, spring; 150, yoke; 160, bracket; 170, armature; 180, tension spring; 190, tripping transmission rod; 200, rotating shaft; 210, arc extinguishing chamber; 2101, arc extinguishing cover; 21011, screw hole plug; 21012, screw; 2102, partition; 2103, arc extinguishing grid; 21031, first type arc extinguishing grid; 21032, second type arc extinguishing grid; 21033, third type arc extinguishing grid; 2104, exhaust plate; 21041, exhaust hole; 220, rotating column; DETAILED DESCRIPTION

[0046] The following will describe the implementation methods of the present application in detail with the help of accompanying drawings and examples, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0047] like Figure 1-Figure 4 As shown, the present invention is a modular assembled DC frame circuit breaker, including a single-pole housing 10, a moving and static contact system arranged in the single-pole housing 10, and at least one tripping device 20 is arranged on one side of the moving and static contact system, wherein the tripping device 20 can be an electronic tripping device 110 or an electromagnetic tripping device 120. The purpose of first adopting the single-pole housing 10 is that the structure of the single-pole housing 10 is modularized, and can be assembled according to requirements, which is better than the cost of opening an integral mold, and is more conducive to the realization of assembling multiple poles. Specifically, it can be assembled into two poles, three poles, four poles or more poles; wherein the electronic tripping device 110 or the electromagnetic tripping device 120 can be separately arranged in the single-pole housing 10, or the electronic tripping device 110 and the electromagnetic tripping device 120 can be centrally arranged in the single-pole housing 10, and in the case of centralized arrangement, double protection is achieved. The electronic tripping device 110 is an electronic transformer, which is used to sense current and transmit the induced current to the intelligent control circuit board in the circuit breaker. After calculation, the chip on the circuit board sends a signal to the operating mechanism 60 to achieve tripping; in addition, an electromagnetic tripping device 120 can be used for tripping protection.

[0048] When assembled into multiple stages, the tripping devices 20 between each single-pole housing 10 can be consistent or inconsistent, that is, if it is a two-stage structure, the two single-pole housings 10 can be independent electronic tripping devices 110 or independent electromagnetic tripping devices 120, or any combination of electronic tripping devices 110 and electromagnetic tripping devices 120. However, the premise is that if it is a DC series structure, a separate setting method is adopted; if not, it can be selected according to the use environment and specific requirements.

[0049] In addition, the present invention makes the following improvements to the moving and static contact system: Figures 5 to 9The moving and static contact system includes a moving contact assembly 30 and a static contact assembly 40. The moving contact assembly 30 is connected to the moving contact busbar 50 through a soft connection. The static contact assembly 40 is arranged on a terminal board 402. The moving contact assembly 30 includes an arc shield 301 and a contact support 302. An installation area is formed between the arc shield 301 and the contact support 302 for placing the moving contact. The moving contact includes an active contact group and an auxiliary contact group. The active contact groups are distributed on both sides of the installation area and are arranged at a certain distance apart. The auxiliary contact group is located between the active contact groups. The active contact group is coaxially arranged with the auxiliary contact group. Baffles 90 are arranged on both outer sides of the active contact group. A rotating shaft hole is formed at one end of the baffle 90 away from the moving contact. A rotating shaft 100 is arranged between the rotating shaft holes for driving the moving contact assembly 30 to disconnect or close.

[0050] In the above technical solution, the moving and static contact system is optimized, and an auxiliary moving contact is arranged between the active contact groups to achieve rapid arc ignition of the arc generated on the moving contact into the arc extinguishing chamber 210, thereby increasing the breaking capacity and improving the electrical life reliability; in addition, the arc shield 301 is arranged to block the arc in a closed state to prevent the arc from entering the soft connection.

[0051] The active contact group comprises a plurality of active contacts 70 arranged side by side, and the auxiliary contact 80 comprises a plurality of auxiliary contacts 80 arranged side by side. The active contacts 70 and the auxiliary contacts 80 are coaxially installed.

[0052] The length of the active contact 70 is less than that of the auxiliary contact 80. A moving silver point 1 701 is provided on the active contact 70. A moving silver point 2 801 and an auxiliary moving silver point 802 are provided on the auxiliary contact. The auxiliary moving silver point 802 is far away from the rotating shaft 100. The moving silver point 1 701 and the moving silver point 2 801 are close to the rotating shaft 100. The rotation paths of the moving silver point 1 701, the moving silver point 2 801 and the auxiliary moving silver point 802 are concentric circles. The rotation paths of the moving silver point 1 701 and the moving silver point 2 801 are the same. The rotation paths are as follows: Figure 6 Shown by dotted line.

[0053] The static contact assembly 40 includes a terminal board 402 and a static contact 401 arranged on the terminal board 402, and the static contact 401 is provided with an auxiliary static silver point 4011 and a static silver point 4012. The auxiliary static silver point 4011 contacts or separates with the auxiliary moving silver point 802, and the static silver point 4012 contacts or separates with the moving silver point 1 701 and the moving silver point 2 801.

[0054] The silver dots provided on the active contact 70 and the auxiliary contact 80 are used to match the silver dots provided on the stationary contact 401 to ensure the reliability and stability during contact.

[0055] In addition, springs 130 are provided between the auxiliary contacts 80 of the auxiliary contact group and the active contacts 70 of the active contact group and the contact support 302. Specifically, each moving contact uses two compression springs 130 to contact the contact support 302, which provide pressure during contact and quick rebound of the moving contact during disconnection. The number of compression springs 130 is not limited to two.

[0056] In the present invention, the static contact assembly 40 further includes an arc-striking plate 403 disposed on the static contact 401, the arc-striking plate 403 including a mounting portion 4031 and an arc-striking portion 4032, the mounting portion 4031 is used to connect the static contact 401 and is disposed on a side close to the terminal block 402, and the arc-striking portion 4032 is disposed on a side of the static contact 401 and faces away from the static contact 401. The arc-striking plate 403 can quickly introduce the arc into the arc extinguishing chamber 210, thereby improving the breaking capacity.

[0057] refer to Figure 10-11 In the present invention, the electromagnetic tripping device 120 is linked with the operating mechanism 60 in the circuit breaker, and comprises a yoke 150, a bracket 160, an armature 170, a tension spring 180, and a tripping transmission rod 190. The yoke 150 is installed on the moving contact wiring busbar, and a bracket 160 is arranged outside the yoke 150. The armature 170 is slidably mounted on the bracket 160. A tension spring 180 is arranged between one end of the armature 170 facing the single-pole housing and the single-pole housing, and the tripping transmission rod 190 is fixedly connected to the armature 170, and a rotating shaft 200 connected to the side of the single-pole housing 10 is formed on the tripping transmission rod 190. The side of the housing 10 is provided with a corresponding rotating column, which has a hole, and one end of the rotating shaft 200 is located in the hole of the rotating column; when the instantaneous current of the moving contact wiring busbar exceeds a predetermined value, the yoke 150 generates a force greater than the force of the tension spring 180, so that the armature 170 moves toward the yoke 150, and at this time, the tripping transmission rod 190 moves with the armature 170. Due to the existence of the rotating shaft 200, one end of the tripping transmission rod 190 linked with the operating mechanism 60 drives the tripping pull plate 601 of the operating mechanism 60 to trip in a rotating manner. After tripping, the yoke 150 loses power, and the armature 170 drives the tripping transmission rod 190 to reset under the action of the tension spring 180. The electromagnetic tripping device 120 is used for mechanical tripping, and can cooperate with the electronic type for two-way protection.

[0058] Fig.12 is a schematic diagram of a mechanism connecting rod in the prior art, referring to Fig.13The present invention also includes an operating mechanism 60, the operating mechanism 60 includes a mechanism connecting rod 602, the mechanism connecting rod 602 includes side plates 6021 arranged opposite to each other, the side plates 6021 are connected to each other, and a connecting block 6022 is formed on the end surface of the side plate 6021, and the connecting blocks 6022 are fixed by a reinforcing plate 6023. When the circuit breaker is in mechanical operation, due to the damage of the mechanical life, and the mechanism connecting rod 602 is riveted at multiple locations, there is a risk that the mechanism connecting rod 602 is twisted and not firm enough, and there is a risk of deformation when the force is large. If it is deformed, the operating performance of this mechanism cannot be fully guaranteed. Therefore, in the above technical solution, a reinforcing plate 6023 is designed, and the connecting block 6022 is formed on the side plate 6021. The reinforcing plate 6023 is designed with two square holes to cooperate with it, and riveted after assembly. After riveting firmly, the mechanism connecting rod 602 becomes a complete whole, improving the defects of twisting and looseness.

[0059] Reference in this invention Figure 14-15 The single-pole housing 10 is further provided with an arc-extinguishing chamber 210, the arc-extinguishing chamber 210 is located at the end of the single-pole housing 10, the arc-extinguishing chamber 210 includes an arc-extinguishing cover 2101, a partition 2102, and an arc-extinguishing grid 2103, the partition 2102 is arranged on both sides of the arc-extinguishing cover 2101 and is fixedly connected to the arc-extinguishing cover 2101, the arc-extinguishing grid 2103 is distributed in the area formed between the partitions 2102, and the arc-extinguishing grid 2103 includes a first-type arc-extinguishing grid 21031, a second-type arc-extinguishing grid 2103 2 and a third type of arc extinguishing grid 21033, the second type of arc extinguishing grid 21032 is located between the first type of arc extinguishing grid 21031 and the third type of arc extinguishing grid 21033, the first type of arc extinguishing grid 21031 is used to receive the arc generated on the arc striking plate 403 of the static contact 401, and the second type of arc extinguishing grid 21032 is provided with a plurality of second type of arc extinguishing grids 21032, the lengths of the second type of arc extinguishing grids 21032 are not completely the same, and their ends are not completely located in the same plane, and the third type of arc extinguishing grid 21033 is used to receive the arc generated by the moving contact. The number of the first type of arc extinguishing grid 21031 and the third type of arc extinguishing grid 21033 are both one, and they have arc striking ends facing the static contact 401 and the moving contact, respectively.

[0060] The structure of the second type of arc extinguishing grid 21032 can be as follows: Fig.16 , Fig.17 The style or other styles can split the arc after arrangement.

[0061] The partition 2102 is made of a gas-producing material. When the arc temperature is too high, the gas-producing material volatilizes gas, which effectively and quickly helps to cool the arc, improve the arc extinguishing effect and speed up the arc extinguishing time.

[0062] An exhaust plate 2104 is provided at the gas outlet side of the arc extinguishing cover 2101 and the arc extinguishing grid 2103. Exhaust holes 21041 are distributed on the exhaust plate 2104. The exhaust plate 2104 is provided with multiple layers, and when the exhaust plates 2104 are arranged, the exhaust holes 21041 between the exhaust plates 2104 are staggered. The exhaust plate 2104 is an insulating epoxy laminate. In addition, the connection between the arc extinguishing cover 2101 and the partition 2102 is that a screw hole plug 21011 is formed on the side of the arc extinguishing cover 2101 where the partition 2102 is installed, and the partition 2102 is connected by screws 21012, which plays a role in strengthening insulation while connecting.

[0063] The arc extinguishing cover 2101 mainly plays two roles, one is the assembly and fixing role, and the other is to strengthen the insulation of the arc extinguishing chamber 210 between multiple poles; the first type of arc extinguishing grid 21031 in the arc extinguishing grid 2103 plays the role of receiving the arc generated on the arc-starting plate 403 of the static contact 401 to achieve rapid arc extinguishing; the third type of arc extinguishing grid 21033 specifically cooperates with the arc generated by the auxiliary contact 80. The exhaust plate 2104 is provided with multiple layers, and its distribution position is staggered, that is, the upper and lower positions are not aligned, and the exhaust holes 21041 are also staggered, which can ensure that the arc ions are not directly ejected when discharged, thereby achieving the effect of zero arcing.

[0064] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.

[0065] The above description shows and describes several preferred embodiments of the present invention, but as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not depart from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A modular assembled DC frame circuit breaker, characterized in that: The invention comprises a single-pole housing and a moving-static contact system arranged in the single-pole housing, wherein at least one tripping device is arranged on one side of the moving-static contact system, wherein the moving-static contact system comprises a moving contact assembly and a static contact assembly, wherein the moving contact assembly is connected to the moving contact busbar through a soft connection, wherein the static contact assembly is arranged on a terminal board, wherein the moving contact assembly comprises an arc shield and a contact support, wherein an installation area is formed between the arc shield and the contact support for placing the moving contact, wherein the moving contact comprises an active contact group and an auxiliary contact group, wherein the active contact groups are distributed on both sides of the installation area and are arranged at a certain distance apart, wherein the auxiliary contact group is located between the active contact groups, wherein the active contact group and the auxiliary contact group are arranged coaxially, wherein baffles are arranged on both outer sides of the active contact group, wherein a rotating shaft hole is formed on the end of the baffle away from the moving contact, wherein a rotating shaft is arranged between the rotating shaft holes for driving the moving contact assembly to disconnect or close, wherein the tripping device comprises an electronic tripping device and An electromagnetic tripping device, wherein an electronic tripping device or / and an electromagnetic tripping device are arranged in a single-pole housing, the electromagnetic tripping device is linked with an operating mechanism in a circuit breaker, and the device comprises: a yoke, a bracket, an armature, a tension spring, and a tripping transmission rod. The yoke is mounted on the moving contact wiring busbar, a bracket is arranged outside the yoke, an armature is slidably mounted on the bracket, a tension spring is arranged between one end of the armature facing the single-pole housing and the single-pole housing, the tripping transmission rod is fixedly connected to the armature, and a rotating shaft connected to the side of the single-pole housing is formed on the tripping transmission rod. When the instantaneous current of the moving contact wiring busbar exceeds a predetermined value, the yoke generates a force greater than the tension spring force, so that the armature moves in the direction of the yoke. At this time, the tripping transmission rod moves with the armature. Due to the existence of the rotating shaft, one end of the tripping transmission rod linked with the operating mechanism drives the tripping pull plate of the operating mechanism to trip in a rotating manner. After tripping, the yoke loses power, and the armature drives the tripping transmission rod to reset under the action of the tension spring.

2. A modular assembled DC frame circuit breaker according to claim 1, characterized in that: The active contact group has a plurality of active contacts arranged side by side, and the auxiliary contact group has a plurality of auxiliary contacts arranged side by side. The length of the active contact is smaller than that of the auxiliary contact. A moving silver point 1 is arranged on the active contact, and a moving silver point 2 and an auxiliary moving silver point are arranged on the auxiliary contact. The auxiliary moving silver point is far away from the rotating shaft, and the moving silver point 1 and the moving silver point 2 are close to the rotating shaft. The rotation path of the moving silver point 1, the rotation path of the moving silver point 2 and the circle where the rotation path of the auxiliary moving silver point is located are concentric circles, and the rotation path of the moving silver point 1 is the same as the rotation path of the moving silver point 2.

3. A modular assembled DC frame circuit breaker according to claim 1, characterized in that: Springs are arranged between the auxiliary contact group, the active contact group and the contact support.

4. A modular assembled DC frame circuit breaker according to claim 2, characterized in that: The static contact assembly includes a wiring board and a static contact arranged on the wiring board, the static contact is provided with an auxiliary static silver point and a static silver point, the auxiliary static silver point contacts or separates with the auxiliary moving silver point, and the static silver point contacts or separates with the moving silver point one and the moving silver point two.

5. A modular assembled DC frame circuit breaker according to claim 4, characterized in that: The stationary contact assembly also includes an arc-striking plate arranged on the stationary contact, the arc-striking plate includes a mounting portion and an arc-striking portion, the mounting portion is used to connect the stationary contact and is arranged on a side close to the terminal board, and the arc-striking portion is arranged on the side of the stationary contact and faces away from the stationary contact.

6. A modular assembled DC frame circuit breaker according to claim 1, characterized in that: It also includes an operating mechanism, which includes a mechanism connecting rod. The mechanism connecting rod includes side plates that are arranged opposite to each other. The side plates are connected to each other. Connecting blocks are formed on the end surfaces of the side plates. The connecting blocks are fixed by reinforcing plates.

7. A modular assembled DC frame circuit breaker according to claim 1, characterized in that: An arc extinguishing chamber is also provided in the single-pole housing, and the arc extinguishing chamber is located at the end of the single-pole housing. The arc extinguishing chamber includes an arc extinguishing cover, a partition, and an arc extinguishing grid. The partition is provided on both sides of the arc extinguishing cover and is fixedly connected to the arc extinguishing cover. The arc extinguishing grids are distributed in the area formed between the partitions. The arc extinguishing grids include first-type arc extinguishing grids, second-type arc extinguishing grids and third-type arc extinguishing grids. The second-type arc extinguishing grids are located between the first-type arc extinguishing grids and the third-type arc extinguishing grids. The first-type arc extinguishing grids are used to receive the arc generated on the arc striking plate of the static contact. A plurality of the second-type arc extinguishing grids are provided. The lengths of the second-type arc extinguishing grids are not completely the same, and the ends thereof are not completely located in the same plane. The third-type arc extinguishing grids are used to receive the arc generated by the moving contact.

8. A modular assembled DC frame circuit breaker according to claim 7, characterized in that: An exhaust plate is arranged at the gas outlet side of the arc extinguishing cover and the arc extinguishing grid, and exhaust holes are distributed on the exhaust plate. The exhaust plate is provided with multiple layers, and when the exhaust plates are arranged, the exhaust holes between the exhaust plates are staggered.

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