Arc extinguishing system and circuit breaker

Abstract

The present invention provides an arc extinguishing system and a circuit breaker, wherein the arc extinguishing system comprises: a contact device, comprising a static contact and a moving contact, the static contact having a contact plate, a conductive frame and a contact connected in sequence, and the moving contact being able to contact or separate from the contact; an arc extinguishing shell, having an arc extinguishing chamber for inserting the moving contact, and an insulating component for separating the conductive frame from the moving contact, the conductive frame being arranged outside the arc extinguishing shell. The arc extinguishing system can overcome the defects in the prior art that the insulation effect of the moving and static contacts is poor, short circuits are easily formed during disconnection, and disconnection test failures are caused.

Description

Technical Field

[0001] The present invention relates to the technical field of power distribution, and in particular to an arc extinguishing system and a circuit breaker. Background Art

[0002] A circuit breaker is a switch device that can close, carry and break the current under normal circuit conditions and can close and carry and break the current under abnormal circuit conditions within a specified time. Its main function is to cut off and connect the load circuit, and cut off the fault circuit to prevent the accident from expanding and ensure safe operation. For the common molded case circuit breaker among circuit breakers, all parts are sealed in a plastic shell, which can automatically cut off the power supply when the current exceeds the rated value.

[0003] The arc extinguishing device of the existing molded case circuit breaker mainly includes an arc extinguishing chamber and a contact system. When a short circuit occurs in the electrical appliance, the circuit breaker performs a disconnecting operation. During the disconnecting process, special attention should be paid to the insulation between the moving and static contacts, otherwise it is easy to cause a short circuit between the moving and static contacts, resulting in failure of the disconnecting test. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art that the insulation effect of the moving and static contacts is poor, short circuits are easily formed during disconnection, and the disconnection test fails, thereby providing an arc extinguishing system with good insulation effect and a circuit breaker with the arc extinguishing system.

[0005] To this end, the present invention provides an arc extinguishing system, including an arc extinguishing device and an arc extinguishing shell, a contact device, including a static contact and a moving contact, the static contact having a contact plate, a conductive frame and a contact connected in sequence, and the moving contact can contact or separate from the contact; the arc extinguishing shell has an arc extinguishing chamber for inserting the moving contact, and an insulating component for separating the conductive frame from the moving contact, and the conductive frame is arranged outside the arc extinguishing shell.

[0006] Further: the conductive frame is an inverted U-shape, comprising a horizontally arranged transverse connecting section, and a first vertical section and a second vertical section respectively arranged on the left and right sides of the transverse connecting section; the insulating component has at least one first insulating rib arranged above the first vertical section, and / or the insulating component has at least one second insulating rib arranged between the second vertical section and the moving contact.

[0007] Further: a gas generating hood is installed on the side of the arc extinguishing shell adjacent to the circuit breaker operating mechanism, a notch is provided on the side of the gas generating hood facing the arc extinguishing shell, and a third insulating rib is provided on the side that can be inserted into the notch to form a labyrinth groove structure.

[0008] Furthermore: at least one half-slot air outlet hole is arranged on the side wall of the arc extinguishing shell away from the moving contact, and a vertically arranged air outlet channel that can guide the arc is arranged, and an air outlet port for discharging the arc is arranged at the end of the air outlet channel, and the half-slot air outlet hole, the air outlet channel and the air outlet are connected.

[0009] Further: one of the half-groove air outlets is arranged at the lower end of the side wall.

[0010] Furthermore: a plurality of first arc-extinguishing grids and a plurality of second arc-extinguishing grids are arranged in the arc-extinguishing housing, a first notch is arranged at the top position of the left side of the first arc-extinguishing grid, a second notch is arranged at the top position of the right side of the second arc-extinguishing grid, and the first arc-extinguishing grids and the second arc-extinguishing grids are arranged at intervals.

[0011] Furthermore: the arc-extinguishing housing comprises a left housing and a right housing which are interlocked and fixed by screws, and slots for inserting the first arc-extinguishing grid and the second arc-extinguishing grid are formed on the inner walls of the left housing and the right housing.

[0012] Furthermore: multiple layers of arc-isolating baffles for arc extinguishing are arranged in the arc-extinguishing housing.

[0013] A guide plate is arranged at the notch of the gas generating hood, and the guide plates at both sides are arranged to form a structure that is narrow in the middle and wide at both sides.

[0014] The present invention also provides a circuit breaker, comprising the arc extinguishing system as described above.

[0015] The technical solution of the present invention has the following advantages:

[0016] 1. The arc extinguishing system provided by the present invention can separate the moving contact and the conductive frame to the maximum extent by arranging an insulating component between the conductive frame of the stationary contact and the moving contact, thereby avoiding interphase short circuit between the moving contact and the stationary contact during disconnection.

[0017] 2. In the arc extinguishing system provided by the present invention, the first insulating ribs and the second insulating ribs can effectively wrap the inverted U-shaped conductive frame to strengthen the insulation between the moving and static contacts. The inverted U-shaped structural setting is conducive to increasing the magnetic field and arc blowing force.

[0018] 3. In the arc extinguishing system provided by the present invention, the third insulating rib can cooperate with the notch of the gas generating hood to form a labyrinth groove structure, thereby strengthening the insulation between the moving and static contacts. The labyrinth groove structure can increase the electrical gap between the moving contact and the second vertical section of the conductive frame, thereby improving the insulation performance between the moving and static contacts.

[0019] 4. The arc extinguishing system provided by the present invention is provided with at least one half-slot air outlet hole on the side wall of the arc extinguishing shell away from the moving contact, and a vertically arranged air outlet channel capable of guiding the arc, and the half-slot air outlet, the air outlet channel and the air outlet are connected. In this way, the gas at the rear end of the arc extinguishing chamber can pass through the half-slot air outlet and the air outlet channel in sequence and be discharged from the air outlet, thereby avoiding the shell bursting due to excessive gas pressure at the rear end of the arc extinguishing chamber, thereby improving reliability.

[0020] 5. In the arc extinguishing system provided by the present invention, since the gas at the bottom of the rear end of the arc extinguishing chamber is far away from the exhaust port, the bottom gas is more difficult to be discharged. By arranging a half-slot air outlet at the lower end of the side wall of the arc extinguishing shell away from the moving contact, the bottom gas can be discharged from the half-slot air outlet through the air outlet channel and then from the air outlet. The above-mentioned half-slot air outlet has the advantage of simple structure.

[0021] 6. The arc extinguishing system provided by the present invention, through the setting of the first notch and the second notch, the first arc extinguishing grid and the second arc extinguishing grid form a left-right staggered gas outlet mode, which can accelerate the movement of the arc to the gas outlet and prevent the arc from transferring toward the moving contact, which is not conducive to the extinguishing of the arc. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 1 A front view of the arc extinguishing system provided by the present invention;

[0024] Figure 2 A three-dimensional diagram of the arc extinguishing system of the present invention without the circuit breaker base;

[0025] Figure 3 for Figure 1 The internal structure diagram of the arc extinguishing chamber shown;

[0026] Figure 4 A schematic diagram of the position distribution between the first arc-extinguishing grid and the second arc-extinguishing grid in the present invention;

[0027] Figure 5 Schematic diagram of the specific structure of the static contact;

[0028] Figure 6 It is a schematic diagram of the cross-sectional structure between the half-slot air outlet, the air outlet channel and the air outlet;

[0029] Figure 7It is a schematic diagram of the connection structure between the arc extinguishing shell and the gas generating hood;

[0030] Figure 8 It is a schematic diagram of the specific structure of the gas generating hood.

[0031] Figure numerals: 1. contact device; 11. static contact; 12. moving contact; 2. contact plate; 21. conductive frame; 22. contact; 3. arc-extinguishing shell; 301. left shell; 302. right shell; 303. slot; 31. arc-extinguishing chamber; 33. horizontal connecting section; 34. first vertical section; 35. second vertical section; 4. insulating assembly; 5. first insulating rib; 51. second insulating rib; 6. gas generating hood; 61. notch; 62. guide plate; 7. third insulating rib; 8. half-slot air outlet; 81. air outlet channel; 82. air outlet; 9. first arc-extinguishing grid; 91. second arc-extinguishing grid; 92. first notch; 93. second notch; 94. arc-isolating baffle. DETAILED DESCRIPTION

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

[0033] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

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

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

[0036] Example

[0037] This embodiment provides a circuit breaker, in which an arc extinguishing system is provided, including:

[0038] The contact device 1 comprises a stationary contact 11 and a moving contact 12, wherein the stationary contact 11 has a contact plate 2, a conductive frame 21 and a contact point 22 connected in sequence, and the moving contact 12 can contact or separate from the contact point 22;

[0039] The arc extinguishing housing 3 has an arc extinguishing chamber 31 for inserting the moving contact 12 , and an insulating component 4 for separating the conductive frame 21 from the moving contact 12 . The conductive frame 21 is arranged outside the arc extinguishing housing 3 .

[0040] The above improvements are as follows: Figure 4 and Figure 5 As shown: the static contact 11 includes a touch plate 2, a conductive frame 21 and a contact 22 connected in sequence, and the contact 22 is used to connect with the moving contact 12. When the operating handle is closed, the moving contact 12 can contact the contact 22 to energize. When the electrical appliance is short-circuited, the moving contact 12 bounces upward to separate the moving contact 12 from the contact 22. At the moment when the circuit breaker disconnects the circuit, an arc will be generated. The arc extinguishing system is an important structure for the disconnection of plastic shell products. During the disconnection process, if the insulation between the moving contact 12 and the conductive frame 21 is not properly handled, it is easy to cause a short circuit between the moving contact 12 and the conductive frame 21, resulting in a disconnection failure. In view of the shortcomings of the prior art, the present invention adopts a new implementation method, in which an insulating component 4 is arranged between the moving contact 12 and the conductive frame 21. Through the arrangement of the insulating component 4, an insulating barrier can be formed at the moving contact 12 and the conductive frame 21, thereby effectively preventing the generated arc from reaching the conductive frame 21, and effectively preventing the phase-to-phase short circuit between the moving contact 12 and the conductive frame 21.

[0041] On the basis of the above embodiment, the conductive frame 21 is an inverted U-shape, and the conductive frame 21 includes a horizontally arranged transverse connecting section 33, and a first vertical section 34 and a second vertical section 35 respectively arranged on the left and right sides of the transverse connecting section 33; the insulating component 4 has a first insulating rib 5 arranged above the first vertical section 34, and / or the insulating component 4 has a second insulating rib 51 arranged between the second vertical section 35 and the moving contact 12.

[0042] As a convertible implementation, the number of the first insulating ribs 5 and the second insulating ribs 51 can be 1, 2, 3 or more.

[0043] The above improvements are as follows: Figure 1 and Figure 5As shown: As one of the preferred implementation modes, the transverse connecting section 33, the first vertical section 34 and the second vertical section 35 form an inverted U-shaped conductive frame 21. The inverted U-shaped structural setting is conducive to increasing the magnetic field and arc blowing force. A first insulating rib 5 is arranged above the transverse connecting section 33, and a second insulating rib 51 is arranged on the right side of the second vertical section. When an arc is generated, the first insulating rib 5 and the second insulating rib 51 form an insulating barrier between the conductive frame 21 and the moving contact 12 to avoid failure of the circuit breaker to disconnect when a short circuit occurs between the moving contact 12 and the static contact 11.

[0044] Based on the above embodiment, a gas generating hood 6 is installed on the side of the arc extinguishing shell 3 adjacent to the circuit breaker operating mechanism, and a notch 61 is provided on the side of the gas generating hood 6 facing the arc extinguishing shell 3, and a third insulating rib 7 is provided on the side that can be inserted into the notch 61 to form a labyrinth groove structure.

[0045] The above improvements are as follows: Figure 1 and Figure 2 and Figure 7 As shown: after a short circuit occurs in the circuit breaker, the gas generating hood 6 generates gas under the erosion of the electric arc, which cools the arc and increases the arc column voltage drop, while increasing the gas pressure in the arc extinguishing chamber 31 to form a strong airflow and produce air blowing. The third insulating rib 7 can cooperate with the notch 61 of the gas generating hood 6 to form a labyrinth groove structure. The labyrinth groove structure can prevent the gas generating hood 6 and the shell from having a small gap during the assembly process, and can still separate the moving contact 12 and the conductive frame 21 to the maximum extent, thereby avoiding phase-to-phase short circuit when the moving contact 12 and the static contact 11 are disconnected.

[0046] On the basis of the above embodiment, a half-slot air outlet 8 is provided at the bottom of the side wall of the arc extinguishing shell 3 away from the moving contact 12, and an air outlet channel 81 is vertically arranged and capable of guiding the arc. An air outlet port 82 for discharging the arc is provided at the end of the air outlet channel 81. The half-slot air outlet 8, the air outlet channel 81 and the air outlet port 82 are connected. The half-slot in this embodiment refers to a slot hole closed at the position of the front end side wall of the shell. After the front end of the slot hole is closed, the arc can be effectively guided to be discharged toward the air outlet channel.

[0047] The above improvements are as follows: Figure 4 and Figure 6As shown: if the air outlet 82 in the arc extinguishing system is not effective, it is not conducive to the movement of the arc, and it is easy to cause the arc to exit the grid, causing back breakdown. When the arc pressure in the arc extinguishing chamber 31 is too large and cannot be discharged smoothly, it is easy to cause the arc extinguishing shell 3 to burst. In view of this problem, this embodiment proposes a new implementation method. Example 1: A half-slot air outlet 8 is set on the side wall of the arc extinguishing shell 3 away from the moving contact 12. The half-slot air outlet 8 is connected to the air outlet channel 81. At the end of the air outlet channel 81 is the air outlet 82. The gas in the arc extinguishing chamber 31 can enter along the half-slot air outlet 8. The gas enters and exits the gas channel 81, and is finally discharged through the gas outlet. By setting the half-slot gas outlet 8, the gas outlet channel 81 and the gas outlet 82, the gas at the bottom of the arc extinguishing chamber 31 can be effectively discharged upward to avoid excessive pressure in the arc extinguishing chamber 31 and cause the shell to burst. Embodiment 2 is basically the same as Embodiment 1, and the only difference is that: a plurality of half-slot gas outlet holes 8 are set on the gas outlet channel 81, and the half-slot gas outlet holes 8 are extended along the length direction of the gas outlet channel 81, so that the arc in the arc extinguishing chamber 31 can be accelerated to enter the gas outlet channel 81 and finally be discharged from the gas outlet 82.

[0048] On the basis of the above embodiment, one of the half-groove air outlet holes 8 is arranged at the lower end of the side wall.

[0049] The above improvement is specifically as follows: the half-slot air outlet 8 is arranged below the side wall, which is conducive to discharging the arc at the bottom of the arc extinguishing chamber 31 shell, avoiding excessive pressure inside the arc extinguishing chamber 31, which may cause the shell to burst.

[0050] On the basis of the above embodiment, a plurality of first arc-extinguishing grids 9 and a plurality of second arc-extinguishing grids 91 are provided in the arc-extinguishing housing 3, a first notch 92 is provided at the top position of the left side of the first arc-extinguishing grid 9, a second notch 93 is provided at the top position of the right side of the second arc-extinguishing grid 91, and the first arc-extinguishing grids 9 and the second arc-extinguishing grids 91 are arranged at intervals.

[0051] The above improvements are as follows: Figure 3 As shown: a plurality of first arc-extinguishing grids 9 and second arc-extinguishing grids 91 are arranged inside the arc-extinguishing housing 3, and the first arc-extinguishing grids 9 and the second arc-extinguishing grids 91 are arranged alternately at intervals, a first notch 92 is arranged on the first arc-extinguishing grid 9, and a second notch 93 is arranged on the second arc-extinguishing grid 91. The first notch 92 and the second notch 93 are a staggered gas outlet mode for the arc to form. This gas outlet track can accelerate the movement of the arc from the grid to the gas outlet 82 of the arc-extinguishing chamber 31, and prevent the arc from transferring toward the contact direction and causing back breakdown.

[0052] Based on the above embodiment, the arc extinguishing housing 3 includes a left housing 301 and a right housing 302 which are interlocked and fixed by screws, and slots 303 for inserting the first arc extinguishing grid 9 and the second arc extinguishing grid 91 are formed on the inner walls of the left housing 301 and the right housing 302.

[0053] The above improvements are specifically as follows: there are slots 303 for inserting the first arc-extinguishing grid 9 and the second arc-extinguishing grid 91 on the inner walls of the left shell 301 and the right shell 302. The setting of the slots 303 can effectively fix the positions of the first arc-extinguishing grid 9 and the second arc-extinguishing grid 91, and there is no need to rivet between the grids. After the first arc-extinguishing grid 9 and the second arc-extinguishing grid 91 are fixed, the left shell 301 and the right shell 302 can be fixed with screws.

[0054] On the basis of the above-mentioned embodiment, multiple layers of arc-isolating baffles 94 for extinguishing arc are arranged in the arc-extinguishing housing 3 .

[0055] The above improvements are as follows: Figure 4 As shown: the first arc extinguishing grid 9 and the second arc extinguishing grid 91 are staggered to form an arc extinguishing track, which can effectively guide the arc direction.

[0056] On the basis of the above-mentioned embodiment, a guide plate 62 is provided at the notch 61 of the gas generating hood 6, and the guide plates 62 on both sides are arranged to form a nozzle structure with a narrow middle portion and wide two sides.

[0057] The above specific improvements are: Figure 8 As shown, the guide plates 62 on both sides are arranged to form a Laval nozzle structure which is narrow in the middle and wide on both sides, which can effectively accelerate the arc to move toward the arc extinguishing chamber 31 while reducing the arc to move backward, that is, toward the moving contact 12.

[0058] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. An arc extinguishing system, characterized in that: include: A contact device (1) comprises a stationary contact (11) and a moving contact (12), wherein the stationary contact (11) has a contact plate (2), a conductive frame (21) and a contact point (22) connected in sequence, the moving contact (12) can contact or separate from the contact point (22), and the conductive frame (21) is arranged outside an arc extinguishing housing (3); An arc extinguishing housing (3) comprises an arc extinguishing chamber (31) for inserting a moving contact (12), and an insulating component (4) for separating the conductive frame (21) from the moving contact (12), wherein the conductive frame (21) is in an inverted U shape, and the inverted U-shaped conductive frame (21) comprises a transverse connecting section (33), and a first vertical section (34) and a second vertical section (35) respectively arranged on the left and right sides of the transverse connecting section (33); the insulating component (4) comprises at least one first insulating rib (5) arranged above the first vertical section (34), and / or the insulating component (4) comprises at least one second insulating rib (51) arranged between the second vertical section (35) and the moving contact (12).

2. The arc extinguishing system according to claim 1, characterized in that: The transverse connecting section (33) is arranged along the horizontal direction.

3. The arc extinguishing system according to claim 2, characterized in that: A gas generating hood (6) is installed on the side of the arc extinguishing housing (3) adjacent to the circuit breaker operating mechanism, a notch (61) is provided on the side of the gas generating hood (6) facing the arc extinguishing housing (3), and a third insulating rib (7) is provided on the side that can be inserted into the notch (61) to form a labyrinth groove structure.

4. The arc extinguishing system according to claim 1, characterized in that: At least one half-slot air outlet (8) and an air outlet channel (81) arranged vertically and capable of guiding an electric arc are arranged on a side wall of the arc extinguishing housing (3) away from the moving contact (12); an air outlet port (82) for discharging the electric arc is arranged at the end of the air outlet channel (81); and the half-slot air outlet (8), the air outlet channel (81) and the air outlet port (82) are connected.

5. The arc extinguishing system according to claim 4, characterized in that: One of the half-groove air outlet holes (8) is arranged at the lower end of the side wall.

6. The arc extinguishing system according to claim 3, characterized in that: A plurality of first arc-extinguishing grids (9) and a plurality of second arc-extinguishing grids (91) are arranged in the arc-extinguishing housing (3); a first notch (92) is arranged at the top of the left side of the first arc-extinguishing grid (9); a second notch (93) is arranged at the top of the right side of the second arc-extinguishing grid (91); and the first arc-extinguishing grids (9) and the second arc-extinguishing grids (91) are arranged at intervals.

7. The arc extinguishing system according to claim 6, characterized in that: The arc-extinguishing housing (3) comprises a left housing (301) and a right housing (302) which are interlocked and fixed by screws, and slots (303) for inserting the first arc-extinguishing grid (9) and the second arc-extinguishing grid (91) are formed on the inner walls of the left housing (301) and the right housing (302).

8. The arc extinguishing system according to claim 7, characterized in that: It also includes multiple layers of arc-isolating baffles (94) arranged on the exhaust port side of the first arc-extinguishing grid (9) and a plurality of second arc-extinguishing grids (91) and used for extinguishing arcs.

9. The arc extinguishing system according to claim 8, characterized in that: A guide plate (62) is provided at the notch (61) of the gas generating hood (6), and the guide plates (62) on both sides are arranged to form a structure with a narrow middle portion and wide two sides.

10. A circuit breaker, characterized in that: The invention comprises an arc extinguishing system as claimed in any one of claims 1 to 9.

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