A high current high breaking plug-in circuit breaker

Abstract

The invention discloses a large-current high-breaking plug-in circuit breaker, comprising a moving contact, a stationary contact, an arc extinguishing chamber, an arc-strike assembly and an arc-guiding acceleration structure arranged on a shell structure. The arc-strike assembly is arranged on both sides of an arc-entry opening in the length direction of the arc-extinguishing chamber. The arc-guiding acceleration structure comprises a magnetizing assembly arranged on both sides of the arc-entry opening in the width direction, and an arc-guiding channel surrounding the moving and stationary contacts, which is formed by connecting the magnetizing assembly, the arc-strike assembly and the shell structure. The cross-sectional width of the arc-guiding channel gradually decreases from the arc-entry opening to the moving contact side. The arc is further accelerated to move in the direction of the arc-entry opening by forming an air pressure difference in the arc-guiding channel and by the magnetic blowing effect of the magnetizing assembly on the arc. The arc-strike efficiency is high and the cooling of the arc can be accelerated by the combined effect of the arc-guiding channel and the magnetizing assembly, thereby avoiding the burning of other parts such as the contacts by the arc, and improving the electrical life and breaking capacity of the circuit breaker.

Description

Technical Field

[0001] The invention relates to the technical field of circuit breakers, and in particular to a large-current high-breaking plug-in circuit breaker. Background Art

[0002] With the rapid development of 5G communication technology, plug-in 5G circuit breakers for 5G base stations have developed rapidly. This plug-in circuit breaker that meets the requirements of the communications industry has a long shape. Its internal structure and layout are very different from traditional small circuit breakers used in power distribution systems. It needs to be designed with targeted new features and made more compact.

[0003] The existing plug-in circuit breaker mainly includes an operating mechanism, a contact system, a tripping structure and an arc extinguishing system. Especially for a plug-in circuit breaker with high breaking capacity and large frame (large current), the short-circuit current energy to be broken is very high, and the design of the arc extinguishing system becomes the key to the success of the development. The arc extinguishing system of the plug-in circuit breaker is usually composed of an arc extinguishing chamber, a contact system, an arc striking structure, etc. The contact system relatively includes a moving contact and a static contact arranged at the opening of the arc extinguishing chamber. The arc striking structure includes two arc striking plates arranged on both sides of the arc extinguishing chamber, one of which extends to connect the static contact, and the other extends close to the moving contact. When the circuit breaker is disconnected, the instantaneous gap between the moving and static contacts is very small, and the electric field strength is large. The strong electric field generated causes the gas between the moving and static contacts to be broken down to form an arc. Through the two arc striking plates, the arc of the moving and static contacts can be quickly introduced into the arc extinguishing chamber to achieve arc extinguishing. The rapid and reliable extinguishing of arcs during disconnection of this plug-in circuit breaker is also the key to reducing switch burnout, especially the burnout of the moving and static contacts.

[0004] Although the existing arc extinguishing chamber can extinguish the arc, it only relies on the arc-starting plates on both sides for arc starting. The speed of introducing the arc into the arc extinguishing chamber is slow. Due to the uncontrollable arc, part of the energy will be released to the open space around the arc extinguishing chamber, that is, the arc will spray around the arc extinguishing chamber. In particular, the uncontrollable arc spraying towards the mechanism is harmful, which will cause metal particles to get stuck in key parts and cause the operating mechanism to slip. In addition, the arc in the contact area encounters the obstruction of the side wall or parts of the circuit breaker, which will not only cause burn damage to related parts, but will also be reflected back to the contact area to cause the arc to reignite, which will prolong the burning time of the arc, aggravate the burning of the contact, and reduce the breaking capacity of the circuit breaker. It can be seen that the existing arc extinguishing chamber cannot meet the arc extinguishing requirements of high-current plug-in circuit breakers at high breaking. Therefore, it is very important to find new breakthroughs to improve the breaking capacity of high-current plug-in circuit breakers. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem in the prior art that the arc extinguishing chamber only relies on the arc striking plates on both sides to strike the arc, the arc is introduced into the arc extinguishing chamber at a slow speed, and will also spray around the arc extinguishing chamber and in the direction of the operating mechanism, which will prolong the burning time of the arc, aggravate the burning of contacts and other parts, and reduce the breaking capacity of the circuit breaker.

[0006] In order to solve the above problems, the present invention provides a large current high breaking plug-in circuit breaker, comprising a moving contact, a stationary contact and an arc extinguishing system arranged in a housing structure, wherein the arc extinguishing system comprises:

[0007] The arc extinguishing chamber comprises an arc inlet arranged toward the moving and static contacts, and arc striking assemblies arranged on both sides of the arc inlet in the length direction;

[0008] The arc guiding acceleration structure comprises a magnetizing component arranged on both sides of the width direction of the arc entry port, and an arc guiding channel surrounding the moving and static contacts formed by connecting the magnetizing component, the arc striking component and the shell structure. The arc guiding channel is connected to the arc entry port, and the cross-sectional width of the arc guiding channel gradually decreases from the arc entry port to the moving contact side. The arc in the arc guiding channel moves rapidly toward the arc entry port driven by the arc blowing magnetic field generated by the magnetizing component.

[0009] In the above-mentioned plug-in circuit breaker, the cross-section of the arc guide channel is a V-shaped structure.

[0010] In the above-mentioned plug-in circuit breaker, the end of the arc guide channel with a larger width is connected to the arc inlet port, and the other end with a smaller width is provided with a connecting port. The moving contact has a moving contact plate extending through the connecting port for connecting to the operating mechanism, and a gap is left between the two sides of the moving contact plate and the connecting port.

[0011] In the above-mentioned plug-in circuit breaker, the magnetizing component includes two arc-guiding baffles arranged on both sides of the width direction of the arc inlet, and two magnetizing plates respectively arranged on the opposite sides of the two arc-guiding baffles. The two arc-guiding baffles are made of gas-producing materials and are respectively arranged in an inclined state on the upper and lower sides of the arc-guiding channel.

[0012] In the above-mentioned plug-in circuit breaker, mounting grooves are respectively arranged on the opposite sides of the two arc-guiding partitions, and the magnetizing sheet is installed in the mounting groove and is fixedly connected with the arc-guiding partition.

[0013] In the above-mentioned plug-in circuit breaker, the shell structure is composed of an upper cover and a base, and the upper cover and the base are respectively provided with a first groove and a second groove for installing the arc extinguishing chamber and the magnetizing component, and a plurality of reinforcing ribs are arranged at intervals at the bottom of the first groove, and at least one limit block is arranged between the first groove and the second groove, and the arc extinguishing chamber and the magnetizing component are respectively limited to abut against the front and rear sides of the limit block.

[0014] In the above-mentioned plug-in circuit breaker, the arc-guiding baffle matches the shape of the second groove, a limiting groove is formed between the limiting block and the second groove, the arc-guiding baffle includes a flat plate portion limitedly installed between the second groove and the limiting groove, an inclined plate portion connected to the flat plate portion, and a clamping block arranged between the flat plate portion and the inclined plate portion, and the magnetizing sheet is inclinedly attached to the inclined plate portion.

[0015] In the above-mentioned plug-in circuit breaker, the arc-striking assembly includes an upper arc-striking plate and a lower arc-striking plate arranged on both sides of the length direction of the arc inlet, and the upper arc-striking plate and the lower arc-striking plate extend on the left and right sides of the arc guide channel respectively. The upper arc-striking plate extends close to the moving contact, and the lower arc-striking plate extends to connect the static contact.

[0016] In the above-mentioned plug-in circuit breaker, two sets of opposite rib structures are formed around the second groove in the upper cover and the base respectively. The two sets of rib structures are abutted and connected when the upper cover and the base are installed and extend to the rear side of the moving and static contacts. The connecting port is formed between the two sets of rib structures corresponding to the moving contact plate.

[0017] In the above-mentioned plug-in circuit breaker, a positioning slot is provided on one side of the retaining rib structure, the static contact is arranged in the positioning slot, and the lower arc-starting plate is extended and arranged in the positioning slot and contacts the static contact.

[0018] In the above-mentioned plug-in circuit breaker, the arc extinguishing chamber includes an arc hood and a plurality of arc extinguishing plates spaced apart in the arc hood, and a plurality of V-shaped cutouts arranged on one end of the plurality of arc extinguishing plates deviating from the center line of the extinguishing plates, two arc striking plates are respectively extended between the two sides of the arc hood and the two side walls of the first groove, and the plurality of V-shaped cutouts are arranged alternately in sequence at the arc inlet along the arrangement direction of the plurality of extinguishing plates.

[0019] In the above-mentioned plug-in circuit breaker, the arc inlet is arranged on the front of the arc isolation cover, and a plurality of exhaust ports are arranged on the back thereof. The plurality of exhaust ports are arranged in at least two rows in an up-and-down staggered manner on the back of the arc isolation cover.

[0020] The technical solution of the present invention has the following advantages compared with the prior art:

[0021] 1. In the plug-in circuit breaker provided by the present invention, the arc extinguishing system includes an arc extinguishing chamber and an arc guide acceleration structure. An arc striking assembly and a magnetizing assembly are arranged around the arc inlet of the arc extinguishing chamber, and the magnetizing assembly, the arc striking assembly and the housing structure are connected to form an arc guide channel surrounding the moving and static contacts. The arc guide channel and the magnetizing assembly form an arc guide acceleration structure connected to the arc extinguishing chamber. The problem of the slow speed of the arc entering the arc extinguishing chamber is effectively solved by designing the arc guide acceleration structure. The moving and static contacts are disconnected in the arc guide channel to generate an arc. According to the closed design of the arc guide channel and the cross-sectional width gradually decreasing from the arc inlet to the moving contact side, the space at the end of the arc guide channel connecting the arc striking port is large to form a low-voltage side. The smaller space at the other end forms a high-voltage side, which is conducive to promoting the arc to move from the contact area on the high-voltage side to the arc extinguishing chamber area on the low-voltage side. The magnetic blowing effect of the magnetizing component on the arc further accelerates the arc to move toward the arc entrance. Through the combined action of the arc guide channel and the magnetizing component, the speed of the arc entering the arc extinguishing chamber is accelerated, the arc striking efficiency is high, and the cooling of the arc is accelerated, thereby greatly improving the arc extinguishing ability of the arc extinguishing chamber. This structural design can control and block the arc from spreading around the arc extinguishing chamber, and can also effectively limit the arc from spraying to the side of the operating mechanism, thereby avoiding the arc burning other parts such as the contacts, and improving the electrical life and breaking capacity of the circuit breaker products.

[0022] 2. In the plug-in circuit breaker provided by the present invention, the cross-sectional shape of the arc guide channel is a V-shaped structure, that is, the space of the arc guide channel toward the arc extinguishing chamber is larger, while the space toward the moving and static contacts is smaller. The arc guide channel designed in this way can compress the space in the area where the moving and static contacts are located, and utilize the pressure difference formed in the arc guide channel to promote the arc to be quickly introduced from the contact area into the arc extinguishing chamber, so as to avoid the arc from being ejected from the connecting port at the other end of the arc guide channel. The arc striking speed is fast and there is no arc reignition phenomenon.

[0023] 3. In the plug-in circuit breaker provided by the present invention, the magnetizing component is composed of two arc guide baffles and two magnetizing sheets, and the magnetizing sheets can preferably be magnet sheets. The two arc guide baffles are respectively arranged in an inclined state on the upper and lower sides of the arc guide channel. The two arc guide baffles designed with an inclined structure can relatively compress the space in the contact area, and have an obvious driving effect on leading the arc to the arc extinguishing chamber. The arc guide baffles made of gas-producing material will produce gas under the erosion of the arc, and the arc is further pushed into the arc extinguishing chamber under the action of the gas pressure difference. At the same time, the arc is also magnetically blown and elongated under the action of the electromagnetic force of the magnetizing sheets, which accelerates the cooling of the arc. Therefore, under the dual effects of the magnetic blowing effect and the pressure difference inside the arc guide channel, the arc is quickly introduced into the arc extinguishing chamber, and the arc striking speed is fast and efficient, which solves the problem of the arc being difficult to enter the arc extinguishing chamber.

[0024] 4. In the plug-in circuit breaker provided by the present invention, the arc extinguishing chamber and the magnetizing component are respectively installed in the first groove and the second groove of the shell structure. A first limiting protrusion is provided between the first groove and the second groove, and a limiting groove is formed between the first limiting protrusion and the second groove. According to the arc-guiding baffle consisting of a flat plate portion, an inclined plate portion and a clamping block, the magnetizing component of this structural design is suitable for automated assembly. After the arc-guiding baffle and the magnetizing sheet are assembled into one, the arc-guiding baffle can be loaded into the second groove by clamping the clamping block by the manipulator of the automatic assembly machine. The arc-guiding baffle is limitedly installed in the second groove by the cooperation of the first limiting protrusion and the limiting groove, and the installation position is accurate, which helps to promote the automated assembly production of the product and improve the installation efficiency.

[0025] In the plug-in circuit breaker provided by the present invention, the upper and lower arc-starting plates are arranged on both sides of the arc-entry opening in the length direction, and the two arc-guiding baffles are arranged on both sides of the arc-entry opening in the length direction, that is, the opening of the arc-extinguishing chamber is surrounded by the two arc-starting plates and the two arc-guiding baffles. When the moving and static contacts are disconnected to generate an arc, according to the equipotential theory, the moving contact will contact the arc-starting piece at a nearby position when it is fully opened, so that the equipotential connection between the upper and lower arc-starting pieces and the moving and static contacts is established, and the arc on the moving contact will be transferred to the moving contact. The arc on the moving and static contacts will also be transferred to the upper arc-striking plate, and the arc on the static contact will also be transferred to the lower arc-striking plate, which will make the arc root run faster, thereby quickly introducing the arc of the moving and static contacts into the arc extinguishing chamber through the upper and lower arc-striking plates, allowing the arc-striking plate to play a more full role, and the remaining arcs will quickly enter the arc extinguishing chamber along the arc guide channel under the action of magnetic blowing, which can reduce the burning of the moving and static contacts by the arc, and prevent the arc from reigniting in the arc guide channel. The arc-striking speed is fast, the arc burning time is shortened, and the breaking capacity of the circuit breaker is greatly improved.

[0026] 6. In the plug-in circuit breaker provided by the present invention, the base and the upper cover are correspondingly formed with a retaining rib structure extending and surrounding the rear of the moving and static contacts. The retaining rib structure can block the arc from being uncontrollably ejected toward the operating mechanism, leaving no space for the arc to move, and cooperate with the special shape of the arc guide acceleration structure to block the arc. The two arc starting plates and two arc guide partitions cooperate to surround the arc inlet position of the arc extinguishing chamber to play an arc starting role, so as to prevent the arc from uncontrollably spreading around the opening of the arc extinguishing chamber, thereby effectively blocking the arc between the arc guide channel and the arc extinguishing chamber, ensuring that the arc is fully and quickly introduced into the arc extinguishing chamber to achieve arc extinguishing, and the arc extinguishing effect is obvious.

[0027] 7. In the plug-in circuit breaker provided by the present invention, a plurality of V-shaped cutouts are arranged on one end of a plurality of arc extinguishing sheets, and the plurality of V-shaped cutouts are arranged alternately in sequence at the arc entrance along the arrangement direction of the plurality of arc extinguishing sheets. This structural design can not only maintain the attraction to the arc, but also utilize the V-shaped cutouts to achieve a better effect of lengthening and cutting the arc entering between the plurality of arc extinguishing sheets, thereby dividing the arc into a plurality of short arcs during movement, so that the short arc after cutting and lengthening has greater contact with the air, lengthening the arc to the maximum extent, cooling the arc, and making it easier to extinguish.

[0028] 8. In the plug-in circuit breaker provided by the present invention, a plurality of exhaust ports are arranged in an up-and-down staggered manner on the back of the arc hood, and a plurality of baffles are formed between the exhaust ports and located on the back of the arc hood. Such a design can enlarge the distance between the exhaust ports to design the baffles behind the arc extinguishing chamber. These baffles are also arranged in an up-and-down staggered manner behind the arc extinguishing chamber to avoid the arc reigniting behind the arc extinguishing chamber. At the same time, they can block the arc from passing through the arc extinguishing chamber, increase the pressure in the interval of the arc extinguishing plates, and improve the arc extinguishing and cooling effect of the arc extinguishing plates on the arc. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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.

[0030] Figure 1 A schematic diagram of the planar structure of the plug-in circuit breaker provided by the present invention;

[0031] Figure 2 for Figure 1 The schematic diagram of the cross-sectional structure of the plug-in circuit breaker shown along line AA;

[0032] Figure 3 for Figure 1 The schematic diagram of the cross-sectional structure of the plug-in circuit breaker on the other side along the AA line is shown;

[0033] Figure 4 for Figure 1 The schematic cross-sectional structure diagram of the plug-in circuit breaker along line BB is shown;

[0034] Figure 5 It is a schematic diagram of the internal structure of the plug-in circuit breaker of the present invention;

[0035] Figure 6 It is a schematic diagram of the installation structure of the arc extinguishing chamber and the magnetizing component in the housing structure of the present invention;

[0036] Figure 7 It is a structural schematic diagram of the housing structure of the present invention;

[0037] Figure 8 This is a schematic diagram of the structure of the arc extinguishing chamber and the magnetizing component of the present invention;

[0038] Fig. 9 It is a structural schematic diagram of the arc extinguishing chamber of the present invention;

[0039] Fig.10 It is a structural schematic diagram of the magnetizing component of the present invention;

[0040] Explanation of the reference numerals in the accompanying drawings: 1. Shell structure; 11. Base; 12. Upper cover; 13. First groove; 14. Second groove; 15. Limiting groove; 16. Reinforcing rib; 2. Arc extinguishing chamber; 21. Arc isolating cover; 22. Arc extinguishing sheet; 23. V-shaped incision; 24. Exhaust port; 3. Arc striking assembly; 31. Upper arc striking plate; 32. Lower arc striking plate; 4. Magnetizing assembly; 41. Arc guiding baffle; 411. Flat plate portion; 412. Inclined plate portion; 413. Clamping block; 42. Magnetizing sheet; 5. Arc guiding channel; 51. Connecting port; 6. Rib structure; 7. Moving contact; 8. Static contact; 91. First limiting protrusion; 92. Second limiting protrusion. DETAILED DESCRIPTION

[0041] 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.

[0042] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0043] 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.

[0044] 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.

[0045] Example 1

[0046] The plug-in circuit breaker in this embodiment is described in detail below with reference to the accompanying drawings:

[0047] The present invention provides Figure 1-10 A high-current high-breaking plug-in circuit breaker shown includes a moving contact 7, a stationary contact 8 and an arc extinguishing system arranged on a housing structure 1, wherein the arc extinguishing system includes:

[0048] The arc extinguishing chamber 2 comprises an arc inlet arranged toward the moving and stationary contacts 8, and arc striking assemblies 3 arranged on both sides of the arc inlet in the length direction;

[0049] The arc guiding acceleration structure includes a magnetizing component 4 arranged on both sides of the width direction of the arc entry port, and an arc guiding channel 5 surrounding the moving and static contacts 8 formed by connecting the magnetizing component 4, the arc striking component 3 and the shell structure 1. The arc guiding channel 5 is connected to the arc entry port, and the cross-sectional width of the arc guiding channel 5 gradually decreases from the arc entry port to the moving contact 7 side. The arc in the arc guiding channel 5 moves rapidly toward the arc entry port driven by the arc blowing magnetic field generated by the magnetizing component 4.

[0050] In the above-mentioned embodiment, an arc-striking assembly 3 and a magnetizing assembly 4 are arranged around the arc-entry opening of the arc-extinguishing chamber 2, and the magnetizing assembly, the arc-striking assembly and the shell structure are connected to form an arc-guiding channel 5 surrounding the moving and static contacts. The arc-guiding channel 5 and the magnetizing assembly 4 constitute an arc-guiding acceleration structure connected to the arc-extinguishing chamber. The problem of the slow speed of the arc entering the arc-extinguishing chamber is effectively solved by designing the arc-guiding acceleration structure. The moving and static contacts are disconnected in the arc-guiding channel 5 to generate an arc. According to the closed design of the arc-guiding channel 5 and the cross-sectional width thereof gradually decreasing from the arc-entry opening to the moving contact side, the space at the end of the arc-guiding channel 5 connected to the arc-striking opening is larger to form a low-voltage side, while the space at the other end is smaller to form a The arc is formed on the high-voltage side, which is conducive to promoting the arc to move from the contact area on the high-voltage side to the arc extinguishing chamber area 2 on the low-voltage side. In addition, the magnetic blowing effect of the magnetizing component 4 on the arc further accelerates the arc to move toward the arc entrance. Through the combined effect of the arc guide channel and the magnetizing component, the movement speed of the arc entering the arc extinguishing chamber is accelerated, the arc striking efficiency is high, and the cooling of the arc can be accelerated, thereby greatly improving the arc extinguishing ability of the arc extinguishing chamber. This structural design can control and block the arc from spreading around the arc extinguishing chamber, and can also effectively limit the arc from spraying to the side of the operating mechanism, thereby avoiding the arc from burning other parts such as contacts, and improving the electrical life and breaking capacity of the circuit breaker product.

[0051] As a preferred embodiment, Figure 2-3 As shown, the cross-sectional shape of the arc guide channel 5 is a V-shaped structure, wherein the end of the arc guide channel 5 with a larger width is connected to the arc inlet, and the other end with a smaller width is provided with a connection port 51, and the moving contact 7 has a moving contact plate extending through the connection port for connecting to the operating mechanism, and a gap is left between the two sides of the moving contact plate and the connection port 51, and the spacing of the gap is 0.5-1mm, so that the moving contact plate reciprocates at the connection port 51 under the drive of the operating mechanism, thereby realizing the contact or separation of the moving contact 7 and the static contact 8 in the arc guide channel 5. According to the above structural arrangement, it can be known that the space of the arc guide channel 5 facing the arc extinguishing chamber 2 is larger, while the space facing the moving and static contacts 8 is smaller. The arc guide channel designed in this way can compress the space in the area where the moving and static contacts 8 are located, and the pressure difference formed in the arc guide channel can promote the arc to be quickly introduced from the contact area into the arc extinguishing chamber, with a fast arc ignition speed and no arc reignition phenomenon.

[0052] In this embodiment, combined with Figure 5-7As shown, the shell structure 1 is composed of an upper cover 12 and a base 11, and the upper cover 12 and the base 11 respectively include a first groove 13 and a second groove 14 for installing the arc extinguishing chamber 2 and the magnetizing component 4, and a plurality of first limiting protrusions 91 and a plurality of second limiting protrusions 92 are respectively provided at both ends of the first groove 13 to limit the front and rear sides of the arc extinguishing chamber 2, and a plurality of reinforcing ribs 16 are arranged at intervals at the bottom of the first groove 13, and the rigidity of the side wall of the shell structure can be enhanced by the reinforcing ribs 16. This structural arrangement plays a role in limiting the installation of the arc extinguishing chamber 2 installed in the first groove 13 through the first limiting protrusion 91 and the second limiting protrusion 92, and at the same time, the magnetizing component 4 is installed in the second groove 14 and cooperates with the first limiting protrusion 91, that is, the first limiting protrusion 91 also plays a role in limiting and resisting the magnetizing component 4 installed in the second groove 14, so that the arc extinguishing chamber 2 and the magnetizing component 4 can be limited in the first groove and the second groove respectively to prevent the installation position from being offset, and the installation stability is good.

[0053] Combine the following Figure 1-3 and Figure 8-10 The specific setting method of the magnetizing component is described in detail:

[0054] The magnetizing component 4 comprises two arc guide baffles 41 arranged on both sides of the width direction of the arc inlet, and two magnetizing sheets 42 respectively arranged on the opposite sides of the two arc guide baffles 41. The two arc guide baffles 41 are made of gas-producing materials and are respectively arranged in an inclined shape on the upper and lower sides of the arc guide channel 5. Mounting grooves are respectively arranged on the opposite sides of the two arc guide baffles 41. The magnetizing sheets 42 are installed in the mounting grooves and are fixedly connected to the arc guide baffles 41. The advantage of this structural arrangement is that the magnetizing sheets 42 can be preferably magnet sheets, which can be tilted to The two arc guide baffles 41 with an oblique structure design can relatively compress the space in the contact area, and have a significant driving effect on leading the arc to the arc extinguishing chamber 2. The arc guide baffles 41 made of gas-producing material will produce gas under arc erosion, and the arc is further pushed into the arc extinguishing chamber 2 under the action of the gas pressure difference. At the same time, the arc is also magnetically blown and elongated under the action of the electromagnetic force of the magnetizing sheet 42, thereby accelerating the cooling of the arc. Therefore, under the dual effects of the magnetic blowing effect and the pressure difference inside the arc guide channel, the arc is quickly introduced into the arc extinguishing chamber, and the arc striking speed is fast and efficient, thereby solving the problem of the arc having difficulty entering the arc extinguishing chamber.

[0055] like Figure 6As shown, the arc guide baffle 41 matches the shape of the second groove 14, the first limiting protrusion 91 is a block structure formed between the first groove 13 and the second groove 14, and a limiting groove 15 is formed between the block structure and the second groove 14. The arc guide baffle 41 includes a flat plate portion 411 limitedly installed between the second groove 14 and the limiting groove 15, and an inclined plate portion 412 connected to the flat plate portion 411, and a clamping block 413 arranged between the flat plate portion 411 and the inclined plate portion 412. The magnetic sheet 42 is inclined and affixed to the inclined plate portion 412. The magnetizing component 4 with this structural design is suitable for automated assembly. After the arc guide baffle 41 and the magnetizing sheet 42 are assembled into one, the arc guide baffle 41 can be installed into the second groove 14 by clamping the clamping block 413 through the manipulator of the automatic assembly machine. The arc guide baffle 41 is limitedly installed in the second groove 14 through the cooperation of the first limiting protrusion 91 and the limiting groove 15. The installation position is accurate, which is conducive to promoting the automated assembly production of the product and improving the installation efficiency.

[0056] Combine the following Figure 3-5 , Figure 8 The specific setting method of the arc striking assembly is described in detail:

[0057] The arc-striking assembly 3 includes an upper arc-striking plate 31 and a lower arc-striking plate 32 arranged on both sides of the length direction of the arc-entry port, and the upper arc-striking plate 31 and the lower arc-striking plate 32 extend to the left and right sides of the arc-guiding channel 5 respectively, and the upper arc-striking plate 31 extends close to the moving contact 7, and the lower arc-striking plate 32 extends to connect the static contact 8. In summary, according to the upper and lower arc-striking plates being arranged on both sides of the length direction of the arc-entry port, and the two arc-guiding baffles 41 being arranged on both sides of the length direction of the arc-entry port, that is, the arc-entry port of the arc-extinguishing chamber is surrounded by the two arc-striking plates and the two arc-guiding baffles 41, when the moving and static contacts are disconnected to generate an arc, according to the equipotential theory, the moving contact 7 is completely When opened, it will contact the upper arc-striking plate in a similar position, so that the equipotential connection between the upper and lower arc-striking plates and the moving and static contacts is established. The arc on the moving contact 7 will be transferred to the upper arc-striking plate, and the arc on the static contact 8 will also be transferred to the lower arc-striking plate, which will make the arc root run faster, thereby quickly introducing the arc of the moving and static contacts into the arc extinguishing chamber 2 through the upper and lower arc-striking plates, allowing the arc-striking plates to play a more full role. The remaining arcs quickly enter the arc extinguishing chamber 2 along the arc guide channel 5 under the action of magnetic blowing. This can reduce the burning of the moving and static contacts by the arc, and prevent the arc from reigniting in the arc guide channel 5. The arc-striking speed is fast, the arc burning time is shortened, and the breaking capacity of the circuit breaker is greatly improved.

[0058] As a preferred embodiment, two opposite groups of baffle structures 6 are formed around the second groove 14 in the upper cover 12 and the base 11 respectively. The two groups of baffle structures 6 are abutted against each other and extend to the rear side of the moving and static contacts 8 when the upper cover 12 and the base 11 are installed, and the connecting port 51 is formed between the two groups of baffle structures 6 corresponding to the position of the moving contact plate. A positioning slot is provided on one side of the baffle structure 6, and the static contact 8 is provided in the positioning slot. The lower arc-starting plate 32 is extended and provided in the positioning slot and abuts against the static contact 8, so that the lower arc-starting plate 32 and the static contact 8 maintain a fixed relative position. The baffle structure 6, the arc-guiding baffle 41 and the upper and lower arc-starting plates designed in this way are connected to form an arc-guiding channel 5 that surrounds the moving and static contacts and the arc-starting port. The advantage of adopting the technical solution is that the arc moves in the direction away from the connecting port 51 under the dual effects of the arc blowing magnetic field and the air pressure difference in the arc guide channel, and the arc can be blocked by the retaining rib structure 6 to eject uncontrollably in the direction of the operating mechanism, leaving no space for the arc to move. At the same time, the special shape of the arc guide acceleration structure is used to block the arc. According to the guide, the two arc starting plates and the two arc guide partitions 41 are coordinated to surround the arc inlet position of the arc extinguishing chamber 2 to play an arc starting role, so as to prevent the arc from uncontrollably spreading around the opening of the arc extinguishing chamber 2, thereby effectively blocking the arc between the arc guide channel 5 and the arc extinguishing chamber 2, ensuring that the arc is fully and quickly introduced into the arc extinguishing chamber to achieve arc extinguishing, and the arc extinguishing effect is obvious.

[0059] The following combination Figure 7-9 The specific setting method of the arc extinguishing chamber is described in detail:

[0060] The arc extinguishing chamber 2 includes an arc shield 21 and a plurality of arc extinguishing plates 22 spaced apart in the arc shield 21, and a plurality of V-shaped cutouts 23 disposed on one end of the plurality of arc extinguishing plates offset from the center line of the arc extinguishing plates. Two arc-starting plates are respectively extended between the two sides of the arc shield 21 and the two side walls of the first groove 13. The plurality of V-shaped cutouts 23 are arranged alternately in sequence at the arc entrance along the arrangement direction of the plurality of arc extinguishing plates. This structural design can not only maintain the attraction to the arc, but also utilize the V-shaped cutouts to achieve a better elongation and cutting effect on the arc entering between the plurality of arc extinguishing plates, thereby dividing the arc into a plurality of short arcs during movement, so that the short arc after cutting and elongation has greater contact with the air, thereby elongating the arc to the maximum extent, cooling the arc, and making it easier to extinguish.

[0061] like Figure 8-9As shown, the arc inlet is provided in front of the arc isolation cover, and a plurality of exhaust ports 24 are provided on the back thereof. The plurality of exhaust ports 24 are arranged in at least two rows in an up-and-down staggered manner on the back of the arc isolation cover, and a plurality of baffles located behind the arc isolation cover are formed between the plurality of exhaust ports 24. Such a design can enlarge the distance between the exhaust ports 24 to design the baffles behind the arc extinguishing chamber 2. These baffles are also arranged in an up-and-down staggered manner behind the arc extinguishing chamber 2 to prevent the arc from reigniting behind the arc extinguishing chamber 2, and at the same time can block the arc from passing through the arc extinguishing chamber 2, increase the pressure in the interval of the arc extinguishing plate 22, and improve the arc extinguishing and cooling effect of the arc extinguishing plate 22 on the arc. The plurality of second limiting protrusions 92 in this embodiment are a plurality of retaining wall structures correspondingly formed on the upper cover 12 and the base 11, and a plurality of exhaust channels connected to the exhaust ports are formed between the plurality of retaining wall structures. These exhaust channels extend to one end of the circuit breaker, thereby discharging the arc extinguishing gas generated by the arc extinguishing chamber to the outside through the exhaust channels, and the exhaust is unobstructed.

[0062] 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 high breaking plug-in circuit breaker, comprising a moving contact (7), a stationary contact (8) and an arc extinguishing system arranged on a housing structure (1), characterized in that: The arc extinguishing system comprises: The arc extinguishing chamber (2) comprises an arc inlet arranged towards the moving and stationary contacts (8), and an arc striking assembly (3) arranged on both sides of the arc inlet in the length direction; An arc guiding acceleration structure, comprising a magnetizing component (4) arranged on both sides of the arc inlet in the width direction, and an arc guiding channel (5) surrounding the moving and stationary contacts (8) formed by connecting the magnetizing component (4), the arc striking component (3) and the housing structure (1), wherein the arc guiding channel (5) is connected to the arc inlet, and the cross-sectional width of the arc guiding channel (5) gradually decreases from the arc inlet to the moving contact (7), and the arc in the arc guiding channel (5) moves rapidly toward the arc inlet under the driving of the arc blowing magnetic field generated by the magnetizing component (4); The cross-sectional shape of the arc guide channel (5) is a V-shaped structure; The arc guide channel (5) has a larger end connected to the arc inlet, and the other end thereof has a smaller width and is provided with a connection port (51); the moving contact (7) has a moving contact plate extending through the connection port for connecting to an operating mechanism, and gaps are left between the two sides of the moving contact plate and the connection port (51); The housing structure (1) is composed of an upper cover (12) and a base (11), wherein the upper cover (12) and the base (11) respectively include a first groove (13) and a second groove (14) for installing the arc extinguishing chamber (2) and the magnetizing component (4); Two sets of opposing retaining rib structures (6) are formed in the upper cover (12) and the base (11) around the second groove (14), respectively. When the upper cover and the base are installed, the two sets of retaining rib structures (6) are abutted against each other and extend to the rear side of the moving and stationary contacts (8).

2. The high current high breaking plug-in circuit breaker according to claim 1, characterized in that: The magnetizing component (4) comprises two arc guide baffles (41) arranged on both sides of the arc inlet in a width direction, and two magnetizing sheets (42) arranged on opposite sides of the two arc guide baffles (41). The two arc guide baffles (41) are both made of gas-generating materials and are arranged in an inclined manner on the upper and lower sides of the arc guide channel (5).

3. The high current high breaking plug-in circuit breaker according to claim 2, characterized in that: Mounting grooves are respectively arranged on the opposite sides of the two arc-guiding baffles (41), and the magnetizing plates (42) are mounted in the mounting grooves to remain fixedly connected to the arc-guiding baffles (41).

4. The high current high breaking plug-in circuit breaker according to any one of claims 1 to 3, characterized in that: A plurality of first limiting protrusions (91) and a plurality of second limiting protrusions (92) are provided at both ends of the first groove (13) for limiting the positions at the front and rear sides of the arc extinguishing chamber (2) respectively; the magnetizing component (4) is installed in the second groove (14) and cooperates with the first limiting protrusions (91) to abut against each other.

5. The high current high breaking plug-in circuit breaker according to claim 4, characterized in that: The arc-guiding baffle (41) matches the shape of the second groove (14); the first limiting protrusion (91) is a stopper structure formed between the first groove (13) and the second groove (14); a limiting groove (15) is formed between the stopper structure and the second groove (14); the arc-guiding baffle (41) comprises a flat plate portion (411) limitedly installed between the second groove (14) and the limiting groove (15); an inclined plate portion (412) connected to the flat plate portion (411); and a clamping block (413) arranged between the flat plate portion (411) and the inclined plate portion (412); the magnetizing sheet (42) is attached to the inclined plate portion in an inclined state.

6. The large current high breaking plug-in circuit breaker according to claim 5, characterized in that: The arc-striking assembly (3) comprises an upper arc-striking plate (31) and a lower arc-striking plate (32) arranged on both sides of the arc inlet in the longitudinal direction, the upper arc-striking plate (31) and the lower arc-striking plate (32) respectively extending to the left and right sides of the arc-guiding channel (5), the upper arc-striking plate (31) extending close to the moving contact (7), and the lower arc-striking plate (32) extending to connect to the stationary contact (8).

7. The large current high breaking plug-in circuit breaker according to claim 6, characterized in that: A positioning slot is provided on one side of the retaining rib structure (6), the stationary contact (8) is arranged in the positioning slot, and the lower arc-starting plate (32) is extended and arranged in the positioning slot and is in contact with the stationary contact (8).

8. The large current high breaking plug-in circuit breaker according to claim 7, characterized in that: The arc extinguishing chamber (2) comprises an arc hood (21) and a plurality of arc extinguishing plates (22) arranged at intervals in the arc hood (21), and a plurality of V-shaped cutouts (23) arranged at one end of the plurality of arc extinguishing plates offset from the center line of the extinguishing plates, two arc striking plates extending between two sides of the arc hood (21) and two side walls of the first groove (13), and the plurality of V-shaped cutouts (23) are arranged alternately in sequence at the arc inlet along the arrangement direction of the plurality of extinguishing plates.

9. The high current high breaking plug-in circuit breaker according to claim 8, characterized in that: The arc inlet is arranged in front of the arc isolation cover, and a plurality of exhaust ports (24) are arranged on the back of the arc isolation cover. The plurality of exhaust ports (24) are arranged in at least two rows in an up-and-down staggered manner on the back of the arc isolation cover.

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