Arc extinguishing chamber, arc extinguishing system and circuit breaker
By separating the arc extinguishing chamber into multiple channels in the arc extinguishing chamber and setting a contraction zone structure, the problems of slow arc transfer speed and poor arc extinguishing effect are solved, and more efficient arc transfer and arc extinguishing effects are achieved.
Patent Information
- Application Number
- CN202421095672.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-17
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-05-17
AI Technical Summary
The existing arc extinguishing chambers have problems such as slow arc transfer speed and poor arc extinguishing effect.
An arc extinguishing chamber is designed, and its arc extinguishing chamber is divided into at least two arc extinguishing channels, and a first contraction zone is provided at the mouth of the cavity, so as to improve the transfer speed of the arc and the arc extinguishing effect through a plurality of air channels and contraction zone structures. .
By separating the arc extinguishing cavity and setting the shrinkage zone structure, the transfer speed and arc extinguishing effect of the arc are significantly improved, and the overall performance of the arc extinguishing chamber is improved.
Smart Images
Figure CN222507517U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to an arc extinguishing chamber, an arc extinguishing system and a circuit breaker. Background Art
[0002] The arc extinguishing system is one of the key structures of an electrical switch. Usually, the arc extinguishing system includes structures such as a moving contact, a stationary contact and an arc extinguishing chamber. The arc extinguishing chamber is one of the basic methods to extinguish the arc. The arc extinguishing grids in the arc extinguishing chamber are stacked and arranged in a certain way. When the moving contact and the stationary contact are disconnected, the generated arc is pulled into the gap between the arc extinguishing grids. The long arc is divided into multiple short arcs by the arc extinguishing grids. The fault current is reduced by increasing the arc voltage, thereby achieving the effect of arc extinguishing.
[0003] The existing arc extinguishing chamber usually has only one slot, which has the problems of slow arc transfer and high breaking energy, resulting in poor arc extinguishing effect of the arc extinguishing chamber. Utility Model Content
[0004] The first purpose of the utility model is to provide an arc extinguishing chamber to solve the technical problems of slow arc transfer speed and poor arc extinguishing effect in the existing arc extinguishing chamber.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] An arc extinguishing chamber, comprising two arc extinguishing chamber side walls arranged opposite to each other and a grid plate group arranged between the two arc extinguishing chamber side walls, wherein the two arc extinguishing chamber side walls and the grid plate group enclose an arc extinguishing chamber, wherein the arc extinguishing chamber comprises at least two arc extinguishing channels sequentially distributed along a first direction, wherein the first direction is directed from one of the arc extinguishing chamber side walls to the other arc extinguishing chamber side wall; each of the arc extinguishing channels extends from the grid plate group to a cavity opening of the arc extinguishing chamber;
[0007] A first contraction zone is provided at the cavity opening end of the arc extinguishing cavity, and an opening area of the first contraction zone tends to decrease along a direction approaching the grid plate group.
[0008] Furthermore, the grid plate group includes a plurality of partition structures distributed in sequence along the first direction and extending toward the cavity opening of the arc extinguishing cavity, and two opposite sides of each of the partition structures form an arc extinguishing channel respectively;
[0009] And / or, the arc extinguishing chamber is provided with a plurality of first gas producing parts which are distributed in sequence along the first direction and extend from the grid group to the cavity opening of the arc extinguishing chamber, and an arc extinguishing channel is formed on opposite sides of each of the first gas producing parts.
[0010] Furthermore, the first gas generating member and the partition structure correspond to each other one by one, and the first gas generating member is coated on the corresponding partition structure.
[0011] Furthermore, each of the first gas producing parts is provided with a plurality of slits at one end close to the cavity opening of the arc extinguishing cavity.
[0012] Furthermore, each arc extinguishing chamber side wall includes interconnected supporting members and second gas producing members, wherein: the two supporting members are respectively connected to opposite sides of the grid group; the two second gas producing members are symmetrically arranged, and the arc extinguishing channel is arranged between the two second gas producing members.
[0013] Furthermore, each of the second gas producing members is provided with a first contraction surface, the first contraction surface is inclined from the cavity opening of the arc extinguishing cavity to the grid group along a direction close to the arc extinguishing cavity, and the first contraction area is formed between the first contraction surfaces on the two second gas producing members;
[0014] And / or, each of the second gas producing parts is provided with a first expansion surface at one end close to the grid group, and the first expansion surface is inclined from the cavity mouth of the arc extinguishing cavity to the grid group along the direction away from the arc extinguishing cavity, and a first expansion zone is formed between the first expansion surfaces on the two second gas producing parts.
[0015] Furthermore, two opposite sides of the grid plate group along the first direction are respectively provided with a limiting structure extending toward the cavity opening of the arc extinguishing cavity, and the two limiting structures are respectively inserted into the two second gas producing parts.
[0016] Furthermore, a second contraction zone is provided at the inlet end of each arc extinguishing channel, and an opening area of the second contraction zone decreases in a direction approaching the grid plate group;
[0017] And / or, a second expansion zone is provided at the outlet end of each arc extinguishing channel, and an opening area of the second expansion zone increases in a direction approaching the grid plate group.
[0018] The second object of the utility model is to provide an arc extinguishing system, comprising a contact structure and an arc extinguishing chamber as described in any one of the above items;
[0019] The contact structure comprises a stationary contact and a moving contact, wherein the moving contact comprises a plurality of moving contact pieces sequentially distributed along the first direction; the movable end of the moving contact can contact or separate from the stationary contact;
[0020] The moving contact is arranged outside the arc extinguishing chamber, and the movable end of the moving contact is arranged opposite to the cavity opening of the arc extinguishing chamber.
[0021] The third object of the utility model is to provide a circuit breaker including the above-mentioned arc extinguishing system.
[0022] Beneficial effects of the utility model:
[0023] In the arc extinguishing chamber provided by the utility model, the arc extinguishing chamber is divided into at least two arc extinguishing channels, that is, the original larger arc extinguishing chamber entrance is divided into multiple smaller arc extinguishing chamber entrances, thereby forming multiple air channels in the arc extinguishing chamber, and the arc transfer speed can be increased through the multiple air channels, thereby improving the arc extinguishing effect of the arc extinguishing chamber. The opening area of the first contraction zone tends to decrease along the direction approaching the grid group, that is, the first contraction zone has a contraction structure along the airflow direction; the configuration of the first contraction zone can increase the pressure difference between the front and rear ends of the arc extinguishing chamber, thereby accelerating the airflow from the front end of the arc extinguishing chamber to the rear end of the arc extinguishing chamber. Under the impetus of the airflow, the arc can be further accelerated to be blown into the arc extinguishing chamber, thereby further improving the arc extinguishing effect of the arc extinguishing chamber.
[0024] In the arc extinguishing system and circuit breaker provided by the utility model, the number of moving contacts can be multiple, and the multiple moving contacts can divide the current passing through the contact structure into several currents in the same direction, thereby effectively improving the short-time tolerance. The moving contact is arranged on the outside of the arc extinguishing cavity, which can reduce the volume of the arc extinguishing chamber under the premise that the number of moving contacts remains unchanged. Since multiple arc extinguishing channels are arranged in the arc extinguishing cavity and a first contraction zone is arranged at the cavity mouth of the arc extinguishing cavity, an airflow that flows rapidly from the moving contact to the inside of the arc extinguishing cavity is formed in the arc extinguishing system, and the arcs at the multiple moving contacts enter the arc extinguishing channels under the suction of the airflow, and quickly enter the grid group with the airflow, so as to achieve the purpose of rapid arc extinguishing. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the specific implementation methods of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0026] Figure 1 A schematic diagram of the front view structure of the arc extinguishing chamber provided in Embodiment 1 and Embodiment 2 of the utility model when the number of arc extinguishing channels is two;
[0027] Figure 2 A schematic diagram of the front view structure of the arc extinguishing chamber provided in Embodiment 1 and Embodiment 2 of the utility model when the number of arc extinguishing channels is greater than two;
[0028] Figure 3 A schematic diagram of the three-dimensional structure of the arc extinguishing chamber provided in Embodiment 1 and Embodiment 2 of the present utility model;
[0029] Figure 4A schematic diagram of the three-dimensional structure of the grid sheet provided in Embodiment 1 and Embodiment 2 of the present utility model;
[0030] Figure 5 for Figure 1 A magnified view at point A;
[0031] Figure 6 A schematic diagram of the three-dimensional structure of the arc extinguishing chamber provided in the third embodiment of the utility model;
[0032] Figure 7 A schematic diagram of the three-dimensional structure of the grid sheet provided in the third embodiment of the present utility model;
[0033] Figure 8 A schematic diagram of the three-dimensional structure of the arc extinguishing chamber provided in the fourth embodiment of the utility model;
[0034] Fig. 9 An exploded view of the arc extinguishing chamber provided in the fourth embodiment of the utility model;
[0035] Fig.10 for Fig. 9 Enlarged view at B;
[0036] Fig.11 A schematic diagram of the three-dimensional structure of a grid sheet provided in the fourth embodiment of the utility model;
[0037] Fig.12 This is a schematic diagram of the front view structure of the arc extinguishing chamber provided in the fifth embodiment of the utility model;
[0038] Fig.13 A schematic diagram of the position structure of a first gas producing component and two second gas producing components provided in Embodiment 5 of the present utility model;
[0039] Fig.14 A schematic diagram of the position structure of a plurality of first gas producing components and two second gas producing components provided in Embodiment 5 of the present utility model;
[0040] Fig.15 A schematic diagram of the three-dimensional structure of the moving contact and the arc extinguishing chamber in the arc extinguishing system provided in the sixth embodiment of the present utility model;
[0041] Fig.16 This is a front view structural schematic diagram of the moving contact and the arc extinguishing chamber in the arc extinguishing system provided in Example 6 of the utility model.
[0042] icon:
[0043] 1-arc extinguishing chamber; 11-arc extinguishing chamber side wall; 111-support member; 112-second gas producing member; 1121-first contraction surface; 1122-first expansion surface; 1123-block; 12-grid group; 121-grid; 1211-separation bar; 1212-limiting bar; 1213-protrusion; 122-separation structure; 123-limiting structure; 13-arc extinguishing chamber; 131-arc extinguishing channel; 1311-second contraction area; 1312-second expansion area; 132-first contraction area; 133-first expansion area; 14-first gas producing member; 141-gap; 142-coating groove; 143-second contraction surface; 144-second expansion surface;
[0044] 2-contact structure; 21-moving contact; 211-moving contact piece. DETAILED DESCRIPTION
[0045] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0046] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or position relationship, are based on the orientation or position 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 a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0047] 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 ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0048] Embodiment 1
[0049] The utility model embodiment 1 provides an arc extinguishing chamber 1, referring to Figure 1 and Figure 2The arc extinguishing chamber 1 comprises two arc extinguishing chamber side walls 11 arranged opposite to each other and a grid plate group 12 arranged between the two arc extinguishing chamber side walls 11; the two arc extinguishing chamber side walls 11 and the grid plate group 12 enclose an arc extinguishing cavity 13;
[0050] The arc extinguishing chamber 13 includes at least two arc extinguishing channels 131 distributed in sequence along a first direction, wherein the first direction is from one arc extinguishing chamber side wall 11 to another arc extinguishing chamber side wall 11; each arc extinguishing channel 131 extends from the grid group 12 to the cavity opening of the arc extinguishing chamber 13;
[0051] A first contraction zone 132 is provided at the opening end of the arc extinguishing chamber 13 , and the opening area of the first contraction zone 132 tends to decrease in a direction approaching the grid plate group 12 .
[0052] In the arc extinguishing chamber 1 provided in the present application, the arc extinguishing chamber 13 is divided into at least two arc extinguishing channels 131, that is, the original larger arc extinguishing chamber entrance is divided into multiple smaller arc extinguishing chamber entrances, thereby forming multiple air channels in the arc extinguishing chamber 13, and the arc transfer speed can be increased through multiple air channels, thereby improving the arc extinguishing effect of the arc extinguishing chamber 1. The opening area of the first contraction zone 132 tends to decrease along the direction approaching the grid group 12, that is, the first contraction zone 132 has a contraction structure along the airflow direction; the configuration of the first contraction zone 132 can increase the pressure difference between the front and rear ends of the arc extinguishing chamber 1, thereby generating suction force on the arc into the arc extinguishing chamber 13, and accelerating the airflow from the front end of the arc extinguishing chamber 1 to the rear end of the arc extinguishing chamber 1. Under the impetus of the airflow, the arc can be further accelerated and blown into the arc extinguishing chamber 1, thereby further improving the arc extinguishing effect of the arc extinguishing chamber 1.
[0053] In the above structure, the number of arc extinguishing channels 131 can be adaptively adjusted according to actual needs and product specifications, and is not limited here. Figure 1 and Figure 2 As shown, the more arc extinguishing channels 131 there are, the wider the cavity opening of the arc extinguishing cavity 13 (that is, the entrance of the arc extinguishing chamber 1) is. Accordingly, the number of moving contact pieces 211 of the moving contact 21 can be increased, thereby improving the short-time tolerance of the arc extinguishing system.
[0054] Reference Figure 3 Each arc extinguishing chamber side wall 11 includes a supporting member 111 and a second gas producing member 112 connected to each other, wherein: the two supporting members 111 are respectively connected to the opposite sides of the grid group 12; the two second gas producing members 112 are symmetrically arranged, and the arc extinguishing channel 131 is arranged between the two second gas producing members 112. The gas producing member can generate a large amount of gas after the current is disconnected, and the arc is accelerated into the interior of the arc extinguishing chamber 1 under the blowing force of the gas.
[0055] In the above structure, the support member 111 is used to support and connect the second gas producing member 112 and the grid plate group 12. The support member 111, the second gas producing member 112 and the grid plate group 12 can be fixed to each other by means of a connection method such as a snap connection or a screw connection. The following is a connection method provided by an embodiment of the utility model:
[0056] In each arc extinguishing chamber side wall 11, a plurality of card blocks 1123 are arranged on the second gas producing member 112, a plurality of card slots are arranged on the supporting member 111, and the plurality of card blocks 1123 correspond to the plurality of card slots one by one, and the card blocks 1123 are arranged in the corresponding card slots;
[0057] Two opposite sides of the grid group 12 are respectively provided with a limiting structure 123 extending toward the cavity opening of the arc extinguishing cavity 13, and the two limiting structures 123 are respectively inserted into the two second gas producing parts 112; Specifically, the grid group 12 includes a plurality of grids 121 distributed in sequence along the second direction, and the second direction is perpendicular to the first direction and the extension direction of the arc extinguishing channel 131, referring to Figure 4 A limiting strip 1212 extending toward the cavity opening of the arc extinguishing cavity 13 is respectively provided on two opposite sides of the grid piece 121 along the first direction; a plurality of limiting strips 1212 on one side of the grid piece 121 form a limiting structure 123; a plurality of limiting strips 1212 on the other side of the grid piece 121 form another limiting structure 123; each second gas producing part 112 is provided with a slot for inserting the limiting strip 1212.
[0058] Through the above arrangement, the two second gas generating members 112 and the grid plate group 12 can be fixed between the two supporting members 111 .
[0059] Reference Figure 5 Each second gas producing member 112 is provided with a first contraction surface 1121, the first contraction surface 1121 is inclined from the cavity opening of the arc extinguishing cavity 13 to the grid group 12 along the direction close to the arc extinguishing cavity 13, and a first contraction area 132 is formed between the first contraction surfaces 1121 on the two second gas producing members 112;
[0060] And / or, each second gas producing part 112 is provided with a first expansion surface 1122 at one end close to the grid group 12, and the first expansion surface 1122 is inclined from the cavity mouth of the arc extinguishing cavity 13 to the grid group 12 along the direction away from the arc extinguishing cavity 13, and a first expansion area 133 is formed between the first expansion surfaces 1122 on the two second gas producing parts 112.
[0061] In the above structure, the first contraction zone 132 is a contraction type structure along the airflow direction, and the first expansion zone 133 is an expansion type structure along the airflow direction. The first contraction zone 132 and the first expansion zone 133 form a Laval airway. Referring to the principle of the Laval airway, the airflow is accelerated through the first contraction zone 132 and diffused through the first expansion zone 133, thereby further increasing the speed at which the arc enters the grid group 12.
[0062] In this embodiment, the outer contour of the cross section of each second gas producing part 112 is triangular or trapezoidal, and the two sides of the triangle or the two sides of the trapezoid correspond to the first contraction surface 1121 and the first expansion surface 1122 respectively; the other side of the triangle or the long side of the trapezoid is away from the arc extinguishing chamber 13; there is a smooth transition between the first contraction surface 1121 and the first expansion surface 1122 close to the arc extinguishing chamber 13.
[0063] In summary, the arc extinguishing chamber 1 provided by the present application is provided with a plurality of air passages inside, through which the speed of the arc passing through the arc extinguishing chamber 13 and entering the grid group 12 can be increased; the cavity opening end of the arc extinguishing chamber 13 is provided with a first contraction area 132, and the first contraction area 132 is a contraction-type structure along the airflow direction, thereby increasing the pressure difference between the front and rear ends of the arc extinguishing chamber 1, accelerating the airflow from the cavity opening of the arc extinguishing chamber 13 to the grid group 12, and further increasing the speed of the arc passing through the arc extinguishing chamber 13 and entering the grid group 12. Since the transfer speed of the arc is greatly improved, the arc extinguishing effect of the arc extinguishing chamber 1 is also greatly improved.
[0064] Embodiment 2
[0065] The second embodiment of the present utility model provides an arc extinguishing chamber 1, which is a specific implementation scheme of the first embodiment.
[0066] Reference Figure 4 and Figure 5 In this embodiment, the grid group 12 includes a plurality of partition structures 122 distributed in sequence along the first direction and extending toward the cavity opening of the arc extinguishing cavity 13, and an arc extinguishing channel 131 is formed on opposite sides of each partition structure 122.
[0067] Specifically, a plurality of separation bars 1211 distributed in sequence along the first direction and extending toward the cavity opening of the arc extinguishing chamber 13 are disposed on the grid 121 , and a plurality of separation bars 1211 corresponding to each other in the second direction form a separation structure 122 .
[0068] In this embodiment, the arc extinguishing chamber 13 is divided into at least two arc extinguishing channels 131 by at least one partition structure 122 .
[0069] Embodiment 3
[0070] The third embodiment of the present invention provides an arc extinguishing chamber 1, which is another specific implementation scheme of the first embodiment.
[0071] Reference Figure 6 A plurality of first gas producing parts 14 are arranged in the arc extinguishing chamber 13 and are sequentially distributed along the first direction and extend from the grid group 12 to the cavity opening of the arc extinguishing chamber 13 . An arc extinguishing channel 131 is formed on opposite sides of each first gas producing part 14 .
[0072] Reference Figure 7 In this embodiment, no separation bar 1211 is provided on the grid sheet 121 .
[0073] In this embodiment, the arc extinguishing chamber 13 is divided into at least two arc extinguishing channels 131 by at least one first gas producing member 14 .
[0074] Embodiment 4
[0075] The fourth embodiment of the present invention provides an arc extinguishing chamber 1, which is an expansion solution based on the second and third embodiments.
[0076] Reference Figure 8 and Fig. 9 In this embodiment, the arc extinguishing chamber 1 is provided with a first gas producing member 14 and a partition structure 122. Specifically, the first gas producing member 14 and the partition structure 122 correspond to each other one by one, and the first gas producing member 14 is coated on the corresponding partition structure 122.
[0077] Reference Fig.10 A plurality of covering grooves 142 distributed in sequence along the second direction are provided at one end of each first gas producing member 14 close to the grid plate group 12 , and the covering grooves 142 are used for corresponding separation bars 1211 to be inserted.
[0078] Reference Fig.10 and Fig.11 , a protrusion 1213 is provided at one end of each partition bar 1211 close to the first gas producing member 14; the first gas producing member 14 includes a first part and a second part that are detachably connected, and each partition bar 1211 is clamped between the corresponding first part and the second part through the protrusion 1213. The first part and the second part can be fixed by clamping, screwing, gluing, etc., which is not limited here.
[0079] Continue to refer to Fig.10 Each first gas producing member 14 is provided with a plurality of slits 141 at one end close to the opening of the arc extinguishing chamber 13. The slits 141 can increase the surface area of the first gas producing member 14 and lengthen the arc, thereby improving the arc extinguishing effect of the arc extinguishing chamber 1.
[0080] Embodiment 5
[0081] The fifth embodiment of the present invention provides an arc extinguishing chamber 1, which is an expansion solution based on the fourth embodiment.
[0082] Reference Fig.12 and Fig.13 In this embodiment, a second contraction area 1311 is provided at the inlet end of each arc extinguishing channel 131, and the opening area of the second contraction area 1311 tends to decrease in the direction approaching the grid group 12;
[0083] And / or, a second expansion area 1312 is provided at the outlet end of each arc extinguishing channel 131 , and an opening area of the second expansion area 1312 increases in a direction approaching the grid plate group 12 .
[0084] In this embodiment, a second contraction zone 1311 is provided at the inlet end of each arc extinguishing channel 131, and a second expansion zone 1312 is provided at the outlet end thereof, wherein: the second contraction zone 1311 is a contraction-type structure along the airflow direction, and the second expansion zone 1312 is an expansion-type structure along the airflow direction, so that each arc extinguishing channel 131 is a Laval airway, and the airflow flowing out from the second contraction zone 1311 can be further accelerated and diffused through the second expansion zone 1312, thereby further increasing the speed at which the arc enters the grid group 12.
[0085] Specifically, two second contraction surfaces 143 are symmetrically provided at the end of the first gas producing member 14 close to the cavity opening of the arc extinguishing cavity 13 , and two second expansion surfaces 144 are symmetrically provided at the end of the first gas producing member 14 close to the grid group 12 .
[0086] Reference Fig.13 In the embodiment where the number of the first gas generating member 14 is one, a second contraction area 1311 is formed between one of the second contraction surfaces 143 on the first gas generating member 14 and the first contraction surface 1121 on one of the second gas generating members 112, and another second contraction area 1311 is formed between another second contraction surface 143 on the first gas generating member 14 and the first contraction surface 1121 on another second gas generating member 112. Similarly, a second expansion area 1312 is formed between adjacent first expansion surfaces 1122 and second expansion surfaces 144.
[0087] Reference Fig.14 For the embodiment in which the number of the first gas producing parts 14 is greater than two, a second contraction area 1311 is formed between any two adjacent second contraction surfaces 143 and between adjacent second contraction surfaces 143 and first contraction surfaces 1121, and a second expansion area 1312 is formed between any two adjacent second expansion surfaces 144 and between adjacent first expansion surfaces 1122 and second expansion surfaces 144.
[0088] In this embodiment, the provision of multiple Laval air ducts can further accelerate the flow of air into the interior of the arc extinguishing chamber 1, and generate suction force toward the interior of the arc extinguishing chamber 1 on the arc at the cavity mouth of the arc extinguishing chamber 13, thereby accelerating the transfer speed of the arc into the interior of the arc extinguishing chamber 1, shortening the arc extinguishing time, and improving the arc extinguishing effect of the arc extinguishing chamber 1.
[0089] Embodiment 6
[0090] The utility model provides an arc extinguishing system according to the sixth embodiment. Fig.15 and Fig.16, the arc extinguishing system comprises a contact structure 2 and an arc extinguishing chamber 1 provided in any of the above embodiments;
[0091] The contact structure 2 includes a stationary contact and a moving contact 21. The moving contact 21 includes a plurality of moving contact pieces 211 distributed in sequence along a first direction. The moving end of the moving contact 21 can contact or separate from the stationary contact.
[0092] The moving contact 21 is disposed outside the arc extinguishing chamber 13 , and a movable end of the moving contact 21 is disposed opposite to a cavity opening of the arc extinguishing chamber 13 .
[0093] In the above structure, the number of moving contact pieces 211 can be multiple, and the multiple moving contact pieces 211 can divide the current passing through the contact structure 2 into several currents in the same direction, thereby effectively improving the short-time tolerance capacity; the moving contact 21 is arranged on the outside of the arc extinguishing cavity 13, which can reduce the volume of the arc extinguishing chamber 1 under the premise that the number of moving contact pieces 211 remains unchanged. Since multiple arc extinguishing channels 131 are arranged in the arc extinguishing cavity 13 and a first contraction area 132 is arranged at the cavity mouth of the arc extinguishing cavity 13, an airflow that flows rapidly from the moving contact 21 to the inside of the arc extinguishing cavity 13 is formed in the arc extinguishing system, and the arcs at the multiple moving contact pieces 211 enter the arc extinguishing channel 131 under the suction of the airflow, and quickly enter the grid group 12 with the airflow, so as to achieve the purpose of rapid arc extinguishing. Through the above structure, the arc extinguishing system provided by the present application has the advantages of compact structure, high breaking capacity, and strong short-time tolerance.
[0094] Embodiment 7
[0095] Embodiment 7 of the present utility model provides a circuit breaker, which includes the arc extinguishing system provided in the above embodiment. The circuit breaker provided in this application has at least all the technical effects of the above arc extinguishing system, which will not be described in detail here.
[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.
Claims
1. An arc extinguishing chamber, comprising two arc extinguishing chamber side walls (11) arranged opposite to each other and a grid plate group (12) arranged between the two arc extinguishing chamber side walls (11), wherein the two arc extinguishing chamber side walls (11) and the grid plate group (12) are arranged to form an arc extinguishing cavity (13), characterized in that: The arc extinguishing chamber (13) comprises at least two arc extinguishing channels (131) distributed in sequence along a first direction, wherein the first direction is directed from one of the arc extinguishing chamber side walls (11) to the other of the arc extinguishing chamber side walls (11); each of the arc extinguishing channels (131) extends from the grid group (12) to the cavity opening of the arc extinguishing chamber (13); A first contraction zone (132) is provided at the cavity opening end of the arc extinguishing cavity (13), and the opening area of the first contraction zone (132) tends to decrease in a direction approaching the grid plate group (12).
2. The arc extinguishing chamber according to claim 1, characterized in that: The grid plate group (12) comprises a plurality of partition structures (122) distributed in sequence along the first direction and extending toward the cavity opening of the arc extinguishing cavity (13), and an arc extinguishing channel (131) is formed on opposite sides of each of the partition structures (122); And / or, the arc extinguishing chamber (13) is provided with a plurality of first gas producing parts (14) distributed in sequence along the first direction and extending from the grid group (12) to the cavity opening of the arc extinguishing chamber (13), and an arc extinguishing channel (131) is formed on opposite sides of each of the first gas producing parts (14).
3. The arc extinguishing chamber according to claim 2, characterized in that: The first gas generating component (14) and the partition structure (122) correspond one to one, and the first gas generating component (14) is coated on the corresponding partition structure (122).
4. The arc extinguishing chamber according to claim 2, characterized in that: A plurality of slits (141) are provided at one end of each of the first gas producing parts (14) close to the cavity opening of the arc extinguishing cavity (13).
5. The arc extinguishing chamber according to claim 1, characterized in that: Each arc extinguishing chamber side wall (11) comprises a supporting member (111) and a second gas producing member (112) connected to each other, wherein: the two supporting members (111) are respectively connected to opposite sides of the grid group (12); the two second gas producing members (112) are symmetrically arranged, and the arc extinguishing channel (131) is arranged between the two second gas producing members (112).
6. The arc extinguishing chamber according to claim 5, characterized in that: Each of the second gas producing parts (112) is provided with a first contraction surface (1121), the first contraction surface (1121) is inclined from the cavity opening of the arc extinguishing cavity (13) to the grid group (12) along a direction close to the arc extinguishing cavity (13), and the first contraction area (132) is formed between the first contraction surfaces (1121) on the two second gas producing parts (112); And / or, each of the second gas producing parts (112) is provided with a first expansion surface (1122) at one end close to the grid group (12), and the first expansion surface (1122) is inclined from the cavity mouth of the arc extinguishing cavity (13) to the grid group (12) along a direction away from the arc extinguishing cavity (13), and a first expansion area (133) is formed between the first expansion surfaces (1122) on the two second gas producing parts (112).
7. The arc extinguishing chamber according to claim 5, characterized in that: The grid group (12) is provided with a limiting structure (123) extending toward the cavity opening of the arc extinguishing cavity (13) on two opposite sides along the first direction, respectively, and the two limiting structures (123) are respectively inserted into the two second gas producing parts (112).
8. The arc extinguishing chamber according to claim 1, characterized in that: A second contraction zone (1311) is provided at the inlet end of each arc extinguishing channel (131), and the opening area of the second contraction zone (1311) tends to decrease in a direction approaching the grid plate group (12); And / or, a second expansion zone (1312) is provided at the outlet end of each arc extinguishing channel (131), and an opening area of the second expansion zone (1312) tends to increase in a direction approaching the grid plate group (12).
9. An arc extinguishing system, characterized in that: Comprising a contact structure (2) and an arc extinguishing chamber as claimed in any one of claims 1 to 8; The contact structure (2) comprises a stationary contact and a moving contact (21); the moving contact (21) comprises a plurality of moving contact pieces (211) distributed in sequence along the first direction; the moving end of the moving contact (21) can contact or separate from the stationary contact; The moving contact (21) is arranged outside the arc extinguishing chamber (13), and the movable end of the moving contact (21) is arranged opposite to the cavity opening of the arc extinguishing chamber (13).
10. A circuit breaker, characterized in that: Comprising the arc extinguishing system as claimed in claim 9.