Modularized moving contact structure, arc extinguishing system and circuit breaker

Abstract

The invention relates to the technical field of low-voltage electric appliances, in particular to a modularized moving contact structure, an arc extinguishing system and a circuit breaker. The modularized moving contact structure comprises at least two splicing units, and the at least two splicing units are sequentially spliced along the rotation axis of the modularized moving contact structure. The at least two splicing units are divided into an arc striking unit and at least one on-off unit; the arc striking unit comprises an arc contact mounting piece and an arc contact of which one end is mounted on the arc contact mounting piece; any one of the on-off units comprises a main contact mounting piece and a main contact, wherein one end of the main contact is mounted on the main contact mounting piece. When the modularized moving contact structure is used, an electric arc generated when a circuit is disconnected is guided to one place by the arc contact, so that the electric arc can be extinguished in a concentrated manner; the current passing through the moving contact structure is divided into at least two paths of current in the same direction, so that the short-time endurance capability of the product is effectively improved; and due to the splicing design, mold opening does not need to be carried out according to different product specifications, and therefore the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage electrical appliances, and particularly to a modular moving contact structure, an arc extinguishing system and a circuit breaker. Background Art

[0002] With the continuous development of the power industry, higher requirements are put forward for the withstand voltage level and carrying capacity of switching components (such as circuit breakers) in the power supply system; especially for the two indicators of short-time overload and short-time withstand current capacity, in a complex traction power supply system, the requirements are more prominent. In order to meet market demands, there appears on the market a contact structure including a plurality of moving contacts arranged side by side. Through several moving contacts arranged side by side, the current passing through the contact structure can be divided into several co-directional currents, thereby effectively improving the short-time withstand capacity. For some occasions with relatively high requirements for short-time withstand capacity, the number of moving contacts may reach more than 6; for some occasions with relatively low requirements for short-time withstand capacity, the number of moving contacts may be between 2 and 6.

[0003] Analyzing from the actual market demand, users do have a demand for circuit breakers with high short-time withstand capacity, but the quantity is not large. If a mold is specially manufactured for a contact structure with high short-time withstand capacity, a lot of cost will be increased. Summary of the Invention

[0004] The first object of the present invention is to provide a modular moving contact structure to solve the technical problem of high production cost caused by mold manufacturing for moving contact structures of different product specifications in the prior art.

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

[0006] A modular moving contact structure includes at least two splicing units, and the at least two splicing units are sequentially spliced along the rotation axis direction of the modular moving contact structure to form an integral body;

[0007] The at least two splicing units are divided into an arcing unit and at least one on-off unit; the arcing unit includes an arc contact mounting member and an arc contact with one end mounted on the arc contact mounting member; any one of the on-off units includes a main contact mounting member and a main contact with one end mounted on the main contact mounting member.

[0008] Further, a first splicing structure is provided between any two adjacent splicing units, and the first splicing structure includes a first slot and a first plug that are in plug-in fit, and any two adjacent splicing units are in plug-in fit through the first slot and the first plug.

[0009] Further, the first splicing structure further includes a second slot and a second plug block that are inserted and fitted together. The second slot is provided in the first plug block, and the second plug block is provided in the first slot. At least one protrusion is provided on the circumferential surface of the second plug block, and at least one groove adapted to the at least one protrusion is provided on the wall surface of the second slot.

[0010] Further, an arc contact mounting cavity is provided on the arc contact mounting member, and one end of the arc contact extends into the arc contact mounting cavity.

[0011] And / or, a main contact mounting cavity is provided on the main contact mounting member, and one end of the main contact extends into the main contact mounting cavity.

[0012] Further, a rotating shaft is correspondingly connected to each of the two splicing units located at the ends.

[0013] Further, the rotating shaft and the splicing unit that are correspondingly connected are detachably connected through the second splicing structure.

[0014] Further, an arc isolation structure is further included. The arc isolation structure includes an arc isolation plate provided on one side of the arc contact, and the main contact adjacent to the arc contact is provided on the side of the arc isolation plate away from the arc contact.

[0015] The arc isolation plate is installed on the arc contact mounting member or the arc contact or the main contact mounting member adjacent to the arc contact or the main contact adjacent to the arc contact.

[0016] Further, the number of the arc isolation plates is two, and the two arc isolation plates are respectively provided on opposite sides of the arc contact.

[0017] Further, the arc isolation structure further includes an isolation rib plate provided between the two arc isolation plates. The isolation rib plate is located on the side of the arc contact having the first moving contact.

[0018] An isolation space is formed by enclosing the outer wall surface of the arc contact mounting member, the two arc isolation plates, and the isolation rib plate.

[0019] Further, the arc contact mounting member, the two arc isolation plates, and the isolation rib plate are integrally formed.

[0020] The second object of the present invention is to provide an arc extinguishing system, including an arc extinguishing chamber, a static contact, and the modular moving contact structure according to any one of the above.

[0021] The arc extinguishing chamber has an arc extinguishing cavity, and one end of the arc contact away from the arc contact mounting member extends into the arc extinguishing cavity to move and can contact or separate from the static contact.

[0022] The arc separating plate corresponds to the position of one side wall of the arc extinguishing cavity. An arc isolation area is formed on the side of the arc separating plate away from the arc extinguishing cavity. One end of any main contact away from the main contact mounting member moves in the arc isolation area and can contact or separate from the static contact.

[0023] Further, the arc separating plate and the corresponding side wall of the arc extinguishing cavity are spaced apart, and the distance therebetween is greater than or equal to 0.1 mm and less than or equal to 2 mm.

[0024] Further, a first avoidance groove for avoiding the arc separating plate is provided on the static contact.

[0025] Further, the arc extinguishing system further includes a static contact support, and the static contact is installed on the static contact support; a second avoidance groove for avoiding the arc separating plate is provided on the static contact support.

[0026] The third object of the present invention is to provide a circuit breaker, including the modular moving contact structure described in any one of the above, or the arc extinguishing system described in any one of the above.

[0027] Advantages of the present invention:

[0028] The present invention provides a modular moving contact structure, an arc extinguishing system and a circuit breaker. The modular moving contact structure includes at least two splicing units, and at least two splicing units are sequentially spliced along the rotation axis of the modular moving contact structure;

[0029] At least two splicing units are divided into an arc leading unit and at least one on-off unit; the arc leading unit includes an arc contact mounting member and an arc contact with one end mounted on the arc contact mounting member; any on-off unit includes a main contact mounting member and a main contact with one end mounted on the main contact mounting member.

[0030] When the above modular moving contact structure is in use, the arc contact is mainly responsible for leading the arc, and the main contact is mainly responsible for conducting the current. The arc generated when the circuit is disconnected is guided to one place by the arc contact, so as to prevent the arc from spreading and facilitate the centralized extinguishing of the arc; at least two splicing units can divide the current passing through the moving contact structure into at least two currents in the same direction, thereby effectively improving the short-time withstand capacity of the product; the splicing design enables the number of on-off units to be adaptively increased or decreased according to the product specifications and actual use requirements, without the need to mold for different product specifications, thereby reducing the production cost and facilitating the batch molding and manufacturing.

[0031] In addition, different from the traditional installation method where multiple moving contacts (including arcing contacts and main contacts) are installed on the same mounting part, the single moving contact in this application adopts an independent installation method, which can avoid the mutual influence between moving contacts during operation. When a single moving contact is damaged, other moving contacts are hardly affected and can still work normally. Moreover, when a single moving contact is damaged, it is only necessary to replace the damaged splicing unit with a spare splicing unit, which is convenient for maintenance and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 FIG. 9 is a three-dimensional structure diagram of an embodiment of the modular moving contact structure provided in Embodiment 1 of the present invention;

[0034] Figure 2 FIG. 13 is a three-dimensional structure diagram of another embodiment of the modular moving contact structure provided in Embodiment 1 of the present invention;

[0035] Figure 3 FIG. 17 is a three-dimensional structure diagram of an arcing unit provided in Embodiment 1 of the present invention from one angle;

[0036] Figure 4 FIG. 21 is a three-dimensional structure diagram of the arcing unit provided in Embodiment 1 of the present invention from another angle;

[0037] Figure 5 FIG. 25 is a three-dimensional structure diagram of a make-break unit provided in Embodiment 1 of the present invention from one angle;

[0038] Figure 6 FIG. 29 is a three-dimensional structure diagram of the make-break unit provided in Embodiment 1 of the present invention from another angle;

[0039] Figure 7 FIG. 33 is a three-dimensional structure diagram of one of the rotating shafts provided in Embodiment 1 of the present invention;

[0040] Figure 8 FIG. 37 is a three-dimensional structure diagram of another rotating shaft provided in Embodiment 1 of the present invention;

[0041] Figure 9 FIG. 41 is a schematic diagram of the connection structure between the arc separating plate and the arcing contact when the arc separating plate is installed on the arcing contact in the modular moving contact structure provided in Embodiment 1 of the present invention;

[0042] Figure 103D structure schematic diagram of the arc extinguishing system provided in the second embodiment of the present invention;

[0043] Figure 11 Structure schematic diagram of the arc extinguishing system provided in the second embodiment of the present invention in the circuit off state;

[0044] Figure 12 Structure schematic diagram of an embodiment of the arc extinguishing system provided in the second embodiment of the present invention in the circuit on state;

[0045] Figure 13 Structure schematic diagram of another embodiment of the arc extinguishing system provided in the second embodiment of the present invention in the circuit on state;

[0046] Figure 14 Structure schematic diagram of the connection of the arc extinguishing chamber, static contact and static contact support in the arc extinguishing system provided in the second embodiment of the present invention.

[0047] Icon:

[0048] 1 - Arc ignition unit; 11 - Arc contact mounting member; 111 - Arc contact mounting cavity; 12 - Arc contact; 121 - First moving contact;

[0049] 2 - On - off unit; 21 - Main contact mounting member; 211 - Main contact mounting cavity; 22 - Main contact; 221 - Second moving contact;

[0050] 31 - First slot; 32 - First plug; 33 - Second slot; 34 - Second plug;

[0051] 4 - Rotating shaft;

[0052] 5 - Arc isolation structure; 51 - Arc isolation plate; 52 - Isolation rib plate; 53 - Isolation space; 54 - Arc isolation area; 55 - Anti - backspray plate;

[0053] 100 - Arc extinguishing chamber; 101 - Arc extinguishing cavity; 102 - Gas - generating component; 103 - Grid plate group;

[0054] 200 - Static contact; 201 - First static contact; 202 - Second static contact;

[0055] 300 - Static contact support; 301 - Second avoidance groove. Detailed implementation manners

[0056] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0057] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is 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. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0058] It should be noted that in the description of the present invention, the terms "connection" and "installation" 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 directly connected, or connected through an intermediate medium; it can be a mechanical connection, or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] Embodiment 1

[0060] The embodiment of the present invention provides a modular moving contact structure. Referring to Figure 1 and Figure 2 , the modular moving contact structure includes at least two splicing units, and at least two splicing units are spliced in sequence along the rotation axis of the modular moving contact structure (the direction shown by the dotted line in the figure);

[0061] The at least two splicing units are divided into an arcing unit 1 and at least one on-off unit 2; the arcing unit 1 includes an arcing contact mounting member 11 and an arcing contact 12 mounted at one end on the arcing contact mounting member 11; any on-off unit 2 includes a main contact mounting member 21 and a main contact 22 mounted at one end on the main contact mounting member 21.

[0062] When the above modular moving contact structure is in use, the arcing contact 12 is mainly responsible for arcing, and the main contact 22 is mainly responsible for conducting current. The arc generated when the circuit is disconnected is guided to one place by the arcing contact 12, thereby preventing the arc from spreading and facilitating the centralized extinguishing of the arc; the at least two splicing units can divide the current passing through the moving contact structure into at least two currents in the same direction, thereby effectively improving the short-time withstand capacity of the product; the splicing design enables the number of on-off units 2 to be adaptively increased or decreased according to the product specifications and actual usage requirements, without the need to mold for different product specifications, thus reducing the production cost and also facilitating batch molding manufacturing.

[0063] In addition, the modular moving contact structure provided by this application represents a breakthrough change in the field of low-voltage electrical appliances, especially in the field of circuit breakers. Different from the traditional installation method where multiple moving contacts (including arcing contacts and main contacts) are installed on the same mounting part, in this application, a single moving contact adopts an independent installation method, which can avoid the mutual influence between moving contacts during operation. When a single moving contact is damaged, other moving contacts are hardly affected and can still operate normally. Moreover, when a single moving contact is damaged, it is only necessary to replace the damaged splicing unit with a spare splicing unit, which is convenient for replacement and maintenance.

[0064] As an optional embodiment, the number of on-off units 2 is one, and the on-off unit 2 is arranged on one side of the arcing unit 1;

[0065] Or, the number of on-off units 2 is multiple, and multiple on-off units 2 are all arranged on one side of the arcing unit 1;

[0066] Or, the number of on-off units 2 is multiple, and the multiple on-off units 2 are divided into two groups of on-off unit groups, and the two groups of on-off unit groups are respectively arranged on both sides of the arcing unit 1.

[0067] Figure 1 In the illustrated embodiment, the multiple on-off units 2 are divided into two groups of on-off unit groups, and the two groups of on-off unit groups are respectively arranged on both sides of the arcing unit 1; the number of on-off units 2 in each group of on-off unit groups can be one or more.

[0068] Figure 2 In the illustrated embodiment, the multiple on-off units 2 are all arranged on one side of the arcing unit 1.

[0069] Referring to Figures 3 to 6 , a first splicing structure is provided between any two adjacent splicing units. The first splicing structure includes a first slot 31 and a first plug 32 that are in plug-in fit. Any two adjacent splicing units are in plug-in fit through the first slot 31 and the first plug 32.

[0070] On the basis of the above structure, the first splicing structure further includes a second slot 33 and a second plug 34 that are in plug-in fit. The second slot 33 is arranged in the first plug 32, and the second plug 34 is arranged in the first slot 31; at least one protrusion is provided on the circumferential surface of the second plug 34, and at least one groove adapted to the at least one protrusion is provided on the groove wall surface of the second slot 33. Exemplarily, three protrusions are provided on the circumferential surface of the second plug 34, and correspondingly, three grooves are provided on the groove wall surface of the second slot 33.

[0071] In the above structure, through the nested first slot 31 and second insert block 34, and the nested first insert block 32 and second slot 33, the rotation axes of multiple splicing units can be ensured to coincide; by providing at least one protrusion on the circumferential surface of the second insert block 34, it can be ensured that two adjacent splicing units can rotate synchronously.

[0072] On the basis of the above structure, the first slot 31 and the first insert block 32 are in interference fit, and the second slot 33 and the second insert block 34 are in interference fit; the above settings enable two adjacent splicing units to be fixed to each other without fasteners, further enhancing the integrity of the modular moving contact structure spliced into one body.

[0073] Continue to refer to Figure 1 and Figure 2 , two splicing units located at the ends are respectively connected with a rotating shaft 4. The axes of the two rotating shafts 4 coincide with the rotation axis of the modular moving contact structure and can cooperate with the product housing so that the modular moving contact structure can rotate around the axis of the rotating shaft 4.

[0074] As an optional embodiment, the number of the on-off units 2 is one, and the on-off unit 2 is arranged on one side of the arcing unit 1; the arc contact mount 11 and the main contact mount 21 are respectively connected with a rotating shaft 4;

[0075] Or, the number of the on-off units 2 is multiple, and multiple on-off units 2 are all arranged on one side of the arcing unit 1; the main contact mounts 21 and the arc contact mounts 11 located at the ends are respectively connected with a rotating shaft 4;

[0076] Or, the number of the on-off units 2 is multiple, and multiple on-off units 2 are divided into two on-off unit groups, and the two on-off unit groups are respectively arranged on both sides of the arcing unit 1; the two main contact mounts 21 located at the ends are respectively connected with a rotating shaft 4.

[0077] Refer to Figure 7 and Figure 8 , the rotating shaft 4 and the splicing unit connected correspondingly are detachably connected through a second splicing structure. In this embodiment, the structure of the second splicing structure is the same as that of the first splicing structure.

[0078] In the above structure, the rotating shaft 4 and the arc contact mounting member 11 or the main contact mounting member 21 connected thereto can be manufactured by die-casting in an integrally formed manner. However, this connection method further increases the types of molds, thereby increasing the manufacturing cost. Based on this, in this embodiment, the existing molds are fully utilized, and the rotating shaft 4 and the arc contact mounting member 11 or the main contact mounting member 21 connected thereto are set in a splicing connection method. On one end face of one rotating shaft 4, an inner and outer nested first slot 31 and second insert block 34 are machined, and on one end face of the other rotating shaft 4, an inner and outer nested first insert block 32 and second slot 33 are machined. Thus, without increasing the types of molds, the two rotating shafts 4 can be spliced with the two splicing units located at the ends according to the actual situation.

[0079] In summary, in the modular moving contact structure provided by the present application, on one end face of the arc contact mounting member 11, an inner and outer nested first slot 31 and second insert block 34 are provided, and on the other end face of the arc contact mounting member 11, an inner and outer nested first insert block 32 and second slot 33 are provided; on one end face of any main contact mounting member 21, an inner and outer nested first slot 31 and second insert block 34 are provided, and on the other end face of any main contact mounting member 21, an inner and outer nested first insert block 32 and second slot 33 are provided; on one end face of one rotating shaft, an inner and outer nested first slot 31 and second insert block 34 are provided, and on one end face of the other rotating shaft, an inner and outer nested first insert block 32 and second slot 33 are provided; thus, in the modular moving contact structure provided by the present application, any two adjacent splicing units along the rotation axis direction of the modular moving contact structure and the adjacent splicing units and the rotating shaft 4 can be plugged and matched.

[0080] Optionally, first disassembly grooves are provided on both opposite end faces of the arc contact mounting member 11, and second disassembly grooves are provided on both opposite end faces of the main contact mounting member 21; when it is necessary to replace one or several splicing units, the adjacent two splicing units are pried open through a tool from the first disassembly groove or the second disassembly groove.

[0081] After the above modular moving contact structure is spliced into a whole, it is placed in the accommodating cavity inside the product housing. The plurality of spliced splicing units are clamped between the two side cavity walls of the accommodating cavity, and the two rotating shafts located at both ends are respectively inserted into the rotating shaft holes on the two side cavity walls of the accommodating cavity; through the above structure, the modular moving contact structure is rotatably arranged inside the product housing.

[0082] Continue to refer to Figure 3 and Figure 5 , an arc contact mounting cavity 111 is provided on the arc contact mounting member 11, and one end of the arc contact 12 extends into the arc contact mounting cavity 111;

[0083] And / or, a main contact mounting cavity 211 is provided on the main contact mount 21, and one end of the main contact 22 extends into the main contact mounting cavity 211.

[0084] In the above structure, one end of the arcing contact 12 and one end of the main contact 22 are located in different mounting cavities, avoiding the phenomenon of electrical connection between the adjacent arcing contact 12 and main contact 22 or between two adjacent main contacts 22, and improving the safety during operation.

[0085] In the prior art, when the circuit is disconnected, the arc will generate high-temperature charged particles, which will quickly diffuse between the contacts. When the concentration of the high-temperature charged particles reaches a certain level, it will cause breakdown between the main contact 22 and the arcing contact 12, resulting in the failure of breaking.

[0086] Based on this, referring to Figure 1 and Figure 2 , the module moving contact structure provided in this application further includes an arc isolation structure 5. The arc isolation structure 5 includes an arc isolation plate 51 provided on one side of the arcing contact 12, and the main contact 22 adjacent to the arcing contact 12 is provided on the side of the arc isolation plate 51 away from the arcing contact 12;

[0087] The arc isolation plate 51 is installed on the arcing contact mount 11 or on the arcing contact 12 or on the main contact mount 21 adjacent to the arcing contact 12 or on the main contact 22 adjacent to the arcing contact 12. In this application, the arc isolation plate 51 can move synchronously with the arcing contact mount 11 or the arcing contact 12 or the main contact mount 21 adjacent to the arcing contact 12 or the main contact 22 adjacent to the arcing contact 12.

[0088] In the above structure, the arc isolation plate 51 can separate the arcing contact 12 and the main contact 22 adjacent to the arcing contact 12; when the circuit is disconnected, the arc isolation plate 51 can block the arc and / or charged particles from transferring to the main contact 22, thus avoiding problems such as untimely current breaking and even breakdown of the main contact 22.

[0089] On the basis of the above structure, the number of the arc isolation plates 51 is two, and the two arc isolation plates 51 are respectively arranged on opposite sides of the arcing contact 12.

[0090] Referring to Figure 4 , a first moving contact 121 for contacting the static contact is provided at one end of the arcing contact 12 away from the arcing contact mount 11; in the state where the circuit is disconnected, the upper end surface of the arc isolation plate 51 is located above the first moving contact 121, and the vertical distance L between the first moving contact 121 and the upper end surface of the arc isolation plate 51 ranges from 4 to 15 mm. It should be noted that the upper end surface of the arc isolation plate 51 is not limited to a plane or a curved surface. When the upper end surface of the arc isolation plate 51 is a curved surface, the vertical distance L between the tangent plane at the highest point of the curved surface and the first moving contact 121 ranges from 4 to 15 mm.

[0091] Referring to Figure 4 Figure 4 , the arc separation structure 5 further includes a partition rib plate 52 disposed between the two arc separation plates 51, and the partition rib plate 52 is located on the side of the arc contact 12 where the first moving contact 121 is located;

[0092] An isolation space 53 is formed by enclosing the outer wall surface of the arc contact mounting member 11, the two arc separation plates 51 and the partition rib plate 52.

[0093] In the above structure, the partition rib plate 52 can insulate the abdomen of the arc contact 12, thereby avoiding the problem of arc voltage drop caused by charged particles breaking through the arc contact 12; the isolation space 53 can accommodate and isolate the arc and / or high-temperature charged particles generated after the current is disconnected, preventing the problem of the arc and / or high-temperature charged particles generated after the current is disconnected from spreading inside the product.

[0094] Figure 4 In the illustrated embodiment, the arc contact mounting member 11, the two arc separation plates 51 and the partition rib plate 52 are integrally formed. This integrally formed connection method can reduce the processing and assembly processes of the product and facilitate the mass production of the product. In addition, the two arc separation plates 51 can also be connected to the outer wall surface of the arc contact mounting member 11 by means of clamping, gluing, screwing, etc.

[0095] Figure 9 In the illustrated embodiment, the two arc separation plates 51 and the partition rib plate 52 are integrally formed, and the upper parts of the two arc separation plates 51 are respectively fixed on the opposite sides of the arc contact 12; optionally, the arc separation plate 51 and the arc contact 12 can be connected by means of clamping, gluing, screwing, etc., which is not limited herein.

[0096] In Figure 9 On the basis of the illustrated embodiment, a backspray prevention plate 55 is connected between the ends of the two arc separation plates 51 away from the first moving contact 121; the backspray prevention plate 55 can play a certain role in blocking charged particles and prevent the problem of reverse breakdown of the gas carrying charged particles.

[0097] In other embodiments, the arc separation plate 51 can also be connected and fixed to the main contact mounting member 21 adjacent to the arc contact 12 or the main contact 22 adjacent to the arc contact 12 by means of clamping, gluing, screwing, etc. Those skilled in the art can reasonably modify the installation position of the arc separation plate 51 according to the above embodiments, which will not be elaborated herein.

[0098] Embodiment 2

[0099] The embodiment of the present invention provides an arc extinguishing system. Referring to Figure 10 Figure 10 , the arc extinguishing system includes an arc extinguishing chamber 100, a static contact 200 and the modular moving contact structure as described in Embodiment 1;

[0100] The arc extinguishing chamber 100 has an arc extinguishing cavity 101. One end of the arc contact 12 away from the arc contact mounting member 11 extends into the arc extinguishing cavity 101 to move and can contact or separate from the static contact 200.

[0101] The arc separating plate 51 corresponds to the position of one side wall of the arc extinguishing cavity 101. An arc isolation area 54 is formed on the side of the arc separating plate 51 away from the arc extinguishing cavity 101. One end of the main contact 22 away from the main contact mounting member 21 moves in the arc isolation area 54 and can contact or separate from the static contact 200.

[0102] In this embodiment, the number of the arc separating plates 51 is two, and the two arc separating plates 51 respectively correspond to the positions of the two side walls of the arc extinguishing cavity 101.

[0103] Specifically, the arc extinguishing chamber 100 includes two spaced gas generating members 102 and a grid plate group 103 arranged between the two gas generating members 102. The two gas generating members 102 and the grid plate group 103 enclose to form the arc extinguishing cavity 101. The two gas generating members 102 are respectively the two side walls of the arc extinguishing cavity 101. The two arc separating plates 51 respectively correspond to the positions of the two gas generating members 102. The arc separating plate 51 and the corresponding side wall of the arc extinguishing cavity 101 (i.e., the gas generating member 102) are spaced apart, and the distance therebetween is greater than or equal to 0.1 mm and less than or equal to 2 mm.

[0104] In the above structure, a narrow gap is formed between the arc separating plate 51 and the corresponding side wall of the arc extinguishing cavity 101, and the minimum width of the gap is set to 0.1 mm. This dimension can accommodate the machining and assembly errors of each workpiece while not hindering the movement of the arc separating plate 51 relative to the arc extinguishing chamber 100. The maximum distance between the arc separating plate 51 and the corresponding side wall of the arc extinguishing cavity 101 is set to 2 mm. This distance can block most of the charged particles on the side of the arc separating plate 51 away from the main contact 22, and the concentration of a very small amount of charged particles overflowing from this gap is not enough to cause the problem of breakdown and arcing between the two side contacts. In addition, the gas in the arc extinguishing cavity 101 can leak out from this gap, so that the pressure in the arc extinguishing cavity 101 can be reduced without increasing the volume of the arc extinguishing chamber 100, and the service life of the arc extinguishing chamber 100 can be prolonged.

[0105] It can be understood that in other embodiments, the arc separating plate 51 can also abut against the corresponding side wall of the arc extinguishing cavity 101; however, this structure has high requirements for machining and assembly accuracy, so it is not preferred.

[0106] Refer to Figure 11, a first static contact point 201 and a second static contact point 202 are provided on the static contact 200; one end of the arcing contact 12 away from the arcing contact mounting member 11 is provided with a first moving contact point 121, and the first moving contact point 121 can contact or separate from the first static contact point 201; one end of the main contact 22 away from the main contact mounting member 21 is provided with a second moving contact point 221, and the second moving contact point 221 can contact or separate from the second static contact point 202.

[0107] In this application, since the arc separating plate 51 is installed on the arcing contact mounting member 11 or on the arcing contact 12 or on the main contact mounting member 21 adjacent to the arcing contact 12 or on the main contact 22 adjacent to the arcing contact 12, the arc separating plate 51 will move with the rotation of the modular moving contact structure, so that the arc separating plate 51 presents two different position states respectively in the circuit-off state and the circuit-on state.

[0108] Specifically, referring to Figure 11 (The dotted line in the figure represents the arc extinguishing chamber 100). In the circuit-off state, the first moving contact point 121 on the arcing contact 12 and the second moving contact point 221 on the main contact 22 are separated from the first static contact point 201 and the second static contact point 202 on the static contact 200 respectively; at this time, the upper end of the arc separating plate 51 extends to pass over the second moving contact point 221, and the lower end of the arc separating plate 51 extends to pass over the second static contact point 202. The arc separating plates 51 on both sides of the arcing contact 12, the arcing contact 12 and the arc extinguishing chamber 100 enclose a relatively closed arc extinguishing space. Most of the arcs and high-temperature charged particles generated after the circuit is disconnected are isolated in the arc extinguishing space and cannot diverge towards both sides of the moving contact structure and the arcing contact 12, and can only be discharged outwards towards the back of the arc extinguishing chamber 100 (that is, from the gap of the grid plate group 103);

[0109] For the embodiment in which the arc separating plate 51 is installed on the arcing contact 12 or on the main contact 22 adjacent to the arcing contact 12, referring to Figure 12 (The dotted line in the figure represents the arc extinguishing chamber 100). In the circuit-on state, the first moving contact point 121 on the arcing contact 12 and the second moving contact point 221 on the main contact 22 contact the first static contact point 201 and the second static contact point 202 on the static contact 200 respectively; since the arc separating plate 51 can move synchronously with the arcing contact 12 or the main contact 22, the vertical distance L between the contact position of the first moving contact point 121 and the first static contact point 201 and the plane where the upper end face of the arc separating plate 51 is located is in the range of 4-15 mm, and this distance hardly hinders the heat at the contact position of the first moving contact point 121 and the first static contact point 201 from dissipating outwards from the orifice of the arc extinguishing cavity 101;

[0110] For the embodiment in which the arc separating plate 51 is installed on the arcing contact mounting member 11 or on the main contact mounting member 21 adjacent to the arcing contact 12, referring to Figure 13(The dashed lines in the figure represent the arc extinguishing chamber 100). Since the arc contact mounting member 11 and the main contact mounting member 21 can still rotate within a small range after both the arc contact 12 and the main contact 22 are in contact with the static contact 200, the arc partition plate 51 can rotate with the arc contact mounting member 11 and the main contact mounting member 21 until the end face of the arc partition plate 51 close to the arc extinguishing chamber 100 is entirely located below the arc extinguishing chamber 100, so that the arc partition plate 51 does not block the heat dissipation from the arc extinguishing cavity 101 to the outside at all.

[0111] If the arc partition plate 51 does not descend when the circuit is on, the heat between the first moving contact 121 and the first static contact 201 is blocked between the two arc partition plates 51 and cannot dissipate from both sides of the arc contact 12, thus posing a safety hazard to the circuit; especially, the arc contact 12 is mainly responsible for arc initiation. The arc contact 12 needs to separate from the static contact 200 after the main contact 22 during the circuit disconnection process. If the temperature at the contact position between the arc contact 12 and the static contact 200 is too high, it may cause welding between the arc contact 12 and the static contact 200, resulting in the inability to disconnect the circuit.

[0112] The working principle of the above arc extinguishing system is as follows:

[0113] Refer to Figure 11 , when the circuit needs to be disconnected, control the arc contact mounting member 11 and the main contact mounting member 21 to rotate counterclockwise around the rotation axis of the modular moving contact structure, and then drive the arc contact 12 and the main contact 22 to rotate counterclockwise around the rotation axis of the modular moving contact structure until both the arc contact 12 and the main contact 22 are stably separated from the static contact 200. At this time, the circuit is in the disconnected state. Since the arc contact 12 separates from the static contact 200 later than the main contact 22, the arc generated after the circuit is disconnected is guided by the arc contact 12 into the arc extinguishing cavity 101 and extinguished by the arc extinguishing chamber 100; the arc partition plate 51 can rise with the rotation of the moving contact structure. Most of the charged particles in the arc extinguishing cavity 101 can be blocked by the arc partition plate 51 on the side away from the main contact 22, thus preventing a large number of charged particles from spilling into the space between the second moving contact 221 and the second static contact 202, ensuring the reliability of the arc extinguishing system for interrupting current and enhancing the ability of the arc extinguishing system to interrupt current;

[0114] Refer to Figure 12, when the circuit needs to be turned on, the control arc contact holder 11 and the main contact holder 21 are moved clockwise around the rotation axis of the modular moving contact structure, driving the arc contact 12 and the main contact 22 to move clockwise around the rotation axis of the modular moving contact structure until both the arc contact 12 and the main contact 22 are in contact with the static contact 200. At this time, the circuit is in the on state; the arc partition plate 51 can descend with the rotation of the moving contact structure. Since there is no obstruction from the arc partition plate 51, the heat in the arc extinguishing cavity 101 can dissipate from the opening of the cavity and radiate outward from both sides of the arc contact 12, preventing the potential circuit safety hazard of excessive temperature at the contact position of the arc contact 12 and the main contact 22 caused by the inability to dissipate heat in time;

[0115] Referring to Figure 13 , in the embodiment where the arc partition plate 51 is installed on the arc contact holder 11 or on the main contact holder 21 adjacent to the arc contact 12, after both the arc contact 12 and the main contact 22 are in contact with the static contact 200, the arc contact holder 11 and the main contact holder 21 continue to rotate clockwise around the rotation axis of the modular moving contact structure until the end face of the arc partition plate 51 close to the arc extinguishing chamber 100 is entirely located below the arc extinguishing chamber 100, so that the arc partition plate 51 completely does not block the dissipation of heat in the arc extinguishing cavity 101.

[0116] Summarizing the above structure, the arc contact 12 and the main contact 22 are arranged side by side along the rotation axis of the moving contact structure, and the static contact 200 is arranged below the arc contact 12 and the main contact 22; one end of the arc contact 12 with the first moving contact 121 and one end of the main contact 22 with the second moving contact 221 can both move in a direction away from or close to the static contact 200, so that the first moving contact 121 and the second moving contact 221 can respectively contact or separate from the first static contact 201 and the second static contact 202; a arc separating plate 51 is arranged on each side of the arc contact 12. In the state where the circuit is disconnected, the upper end surface of each arc separating plate 51 is located above the first moving contact 121, and the vertical distance L between the first moving contact 121 and the upper end surface of the arc separating plate 51 ranges from 4 to 15 mm. In the above structure, in the state where the circuit is disconnected, the arc separating plate 51 can separate the first moving contact 121 and the second moving contact 221; in the state where the circuit is connected, for the embodiment where the arc separating plate 51 is installed on the arc contact 12 or the main contact 22, since the arc separating plate 51 can move synchronously with the arc contact 12 or the main contact 22, therefore, the vertical distance L between the contact position of the first moving contact 121 and the first static contact 201 and the upper end surface of the arc separating plate 51 ranges from 4 to 15 mm, and this distance will not hinder the heat dissipation of the arc extinguishing cavity 101; in addition, in the state where the circuit is connected, for the embodiment where the arc separating plate 51 is installed on the arc contact mounting member 11 or the main contact mounting member 21, since the arc separating plate 51 can continue to move downward after the arc contact 12 contacts the static contact 200, therefore, the end surface of the arc separating plate 51 close to the arc extinguishing chamber 100 can move below the contact position of the first moving contact 121 and the first static contact 201, so that the arc separating plate 51 will not hinder the heat dissipation of the arc extinguishing cavity 101 at all.

[0117] In summary, through the arc separating plate 51, the present application can block the charged particles in the arc extinguishing cavity 101 from spilling to both sides of the arc contact 12 after the circuit is disconnected, but will not block the heat dissipation in the arc extinguishing cavity 101 after the circuit is connected, so that the arc extinguishing system has the advantages of high breaking capacity and high use safety.

[0118] Referring to Figure 14 , a first avoidance groove for avoiding the arc separating plate 51 needs to be provided on the static contact 200.

[0119] In this embodiment, the arc extinguishing system further includes a static contact support 300, and the static contact 200 is installed on the static contact support 300; a second avoidance groove 301 for avoiding the arc separation plate 51 is provided on the static contact support 300. On the basis of the above structure, the number of the second avoidance grooves 301 is two, and the two arc separation plates 51 are respectively inserted into the two second avoidance grooves 301 and can respectively slide in the two second avoidance grooves 301. The setting of the second avoidance groove 301 is used for avoiding the arc separation plate 51 on the one hand, to prevent the static contact support 300 from hindering the movement of the arc separation plate 51; on the other hand, the second avoidance groove 301 can limit the position of the arc separation plate 51 to prevent the arc separation plate 51 from shaking greatly under the impact of the gas.

[0120] Embodiment III

[0121] The embodiment of the present invention provides a circuit breaker, which includes a modular moving contact structure as in Embodiment I, or an arc extinguishing system as in Embodiment II.

[0122] The circuit breaker at least has the technical effects of any one of the above embodiments, which will not be elaborated here.

[0123] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A modular moving contact structure, characterized in that, it includes at least two splicing units, and at least two of the splicing units are sequentially spliced along the rotation axis direction of the modular moving contact structure to form an integral body; the at least two splicing units are divided into an arcing unit (1) and at least one on-off unit (2); the arcing unit (1) includes an arcing contact mounting member (11) and an arcing contact (12) with one end mounted on the arcing contact mounting member (11); any one of the on-off units (2) includes a main contact mounting member (21) and a main contact (22) with one end mounted on the main contact mounting member (21).

2. The modular moving contact structure according to claim 1, characterized in that, a first splicing structure is provided between any two adjacent splicing units, the first splicing structure includes a first slot (31) and a first plug (32) that are in plug-in fit, and any two adjacent splicing units are in plug-in fit through the first slot (31) and the first plug (32).

3. The modular moving contact structure according to claim 2, characterized in that, the first splicing structure further includes a second slot (33) and a second plug (34) that are in plug-in fit, the second slot (33) is arranged in the first plug (32), and the second plug (34) is arranged in the first slot (31); at least one protrusion is provided on the circumferential surface of the second plug (34), and at least one groove adapted to the at least one protrusion is provided on the groove wall surface of the second slot (33).

4. The modular moving contact structure according to claim 1, characterized in that, an arcing contact mounting cavity (111) is provided on the arcing contact mounting member (11), and one end of the arcing contact (12) extends into the arcing contact mounting cavity (111); and / or, a main contact mounting cavity (211) is provided on the main contact mounting member (21), and one end of the main contact (22) extends into the main contact mounting cavity (211).

5. The modular moving contact structure according to claim 1, characterized in that, a rotating shaft (4) is correspondingly connected to each of the two splicing units located at the ends.

6. The modular moving contact structure according to claim 5, characterized in that, the rotating shaft (4) and the splicing unit that are correspondingly connected are detachably connected through a second splicing structure.

7. The modular moving contact structure according to claim 1, characterized in that, it further includes an arc isolation structure (5), the arc isolation structure (5) includes an arc isolation plate (51) arranged on one side of the arcing contact (12), and the main contact (22) adjacent to the arcing contact (12) is arranged on the side of the arc isolation plate (51) away from the arcing contact (12); the arc isolation plate (51) is installed on the arcing contact mounting member (11) or the arcing contact (12) or the main contact mounting member (21) adjacent to the arcing contact (12) or the main contact (22) adjacent to the arcing contact (12).

8. The modular moving contact structure according to claim 7, characterized in that, The number of the arc separating plates (51) is two, and the two arc separating plates (51) are respectively arranged on opposite sides of the arc contact (12).

9. The modular moving contact structure according to claim 8, characterized in that, the arc separating structure (5) further includes a separating rib plate (52) arranged between the two arc separating plates (51), and the separating rib plate (52) is located on the side of the arc contact (12) having the first moving contact point (121); An isolating space (53) is formed by enclosing the outer wall surface of the arc contact mount (11), the two arc separating plates (51) and the separating rib plate (52).

10. The modular moving contact structure according to claim 9, characterized in that, the arc contact mount (11), the two arc separating plates (51) and the separating rib plate (52) are integrally formed.

11. An arc extinguishing system, characterized in that, it includes an arc extinguishing chamber (100), a static contact (200) and the modular moving contact structure according to any one of claims 7 to 10; The arc extinguishing chamber (100) has an arc extinguishing cavity (101), and one end of the arc contact (12) away from the arc contact mount (11) extends into the arc extinguishing cavity (101) to move and can contact or separate from the static contact (200); The position of the arc separating plate (51) corresponds to one side wall of the arc extinguishing cavity (101). An arc isolation area (54) is formed on the side of the arc separating plate (51) away from the arc extinguishing cavity (101). One end of any main contact (22) away from the main contact mount (21) moves in the arc isolation area (54) and can contact or separate from the static contact (200).

12. The arc extinguishing system according to claim 11, characterized in that, the arc separating plate (51) and the corresponding side wall of the arc extinguishing cavity (101) are arranged at intervals, and the distance therebetween is greater than or equal to 0.1 mm and less than or equal to 2 mm.

13. The arc extinguishing system according to claim 11, characterized in that, a first avoidance groove for avoiding the arc separating plate (51) is arranged on the static contact (200).

14. The arc extinguishing system according to claim 11, characterized in that, the arc extinguishing system further includes a static contact support (300), and the static contact (200) is installed on the static contact support (300); a second avoidance groove (301) for avoiding the arc separating plate (51) is arranged on the static contact support (300).

15. A circuit breaker, characterized in that, it includes the modular moving contact structure according to any one of claims 1 to 10, or the arc extinguishing system according to any one of claims 11 - 14.

Images