Arc extinguishing chamber exhaust structure and switchgear

Abstract

The application relates to an arc-extinguishing chamber exhaust structure and a switch electric appliance. The arc-extinguishing chamber exhaust structure comprises an arc-extinguishing grid assembly and a base plate. The base plate is provided with a window for accommodating the arc-extinguishing grid assembly. An exhaust passage is arranged at the window edge on the outlet side of the arc-extinguishing grid assembly. The exhaust passage comprises a first exhaust passage and a second exhaust passage. The first exhaust passage further comprises a first air inlet and a first extension air duct. The second exhaust passage further comprises a second air inlet and a second extension air duct. The first air inlet and the second air inlet are respectively arranged on the outlet side of the lower half arc-extinguishing grid and the upper half arc-extinguishing grid of the arc-extinguishing grid assembly. The first extension air duct starts from the first air inlet and extends obliquely upwards. The second extension air duct starts from the second air inlet and extends obliquely downwards. The arc-extinguishing chamber has a faster exhaust speed and a more uniform exhaust effect, and the length of the exhaust passage is relatively long while the size of the circuit breaker is miniaturized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of switch electric appliances, in particular to the improvement of arc extinguishing chamber exhaust structure. BACKGROUND

[0002] In switch electric appliances such as circuit breaker, arc extinguishing chamber is an important unit for arc extinguishing when the moving and static contacts are disconnected. Generally speaking, when arc is generated between the moving and static contacts, the arc is guided by arc guide plate and pushed by air blowing to enter the arc extinguishing chamber, and arc extinguishing grid is arranged in the arc extinguishing chamber to extinguish the arc. After arc extinguishing, the ionized gas and residual arc that are ejected from the outlet side of the arc extinguishing grid need to be discharged to the outside of the circuit breaker through the exhaust channel. The design of the exhaust channel directly affects the discharge efficiency of the ionized gas and arc in the arc extinguishing chamber, the temperature of the arc extinguishing chamber, and the important safety parameters such as the arc flying distance of the product. The exhaust channel in the prior art is mostly designed as a straight single exhaust channel, which makes it necessary to design the outer size of the circuit breaker to be larger in order to ensure that the length of the exhaust channel is sufficient to meet the gas cooling condition. Or, due to the limitation of the outer size of the circuit breaker, the length of the exhaust channel is shortened, which leads to the defect that the gas cooling is not conducive due to the short exhaust channel. In addition, the single exhaust channel in the prior art is also difficult to uniformly discharge all the gas in the arc extinguishing chamber space, which affects the exhaust efficiency and increases the risk of arc reignition. SUMMARY

[0003] Therefore, in view of the above problems, the present application proposes an arc extinguishing chamber exhaust structure with optimized structure, and based on the arc extinguishing chamber exhaust structure, a switch electric appliance with the arc extinguishing chamber exhaust structure is also proposed.

[0004] The present application adopts the following technical solutions to achieve the above purposes:

[0005] The present application proposes an arc extinguishing chamber exhaust structure, which comprises an arc extinguishing grid assembly and a base plate. The arc extinguishing grid assembly is composed of a plurality of arc extinguishing grids arranged in opposite directions. The relative arrangement direction of the arc extinguishing grids is defined as the up-down direction. The base plate is provided with a window for accommodating the arc extinguishing grid assembly. An exhaust channel is arranged at the edge of the window on the outlet side of the arc extinguishing grid assembly. The exhaust channel comprises a first exhaust channel and a second exhaust channel. The first exhaust channel further comprises a first gas inlet and a first extension gas duct. The second exhaust channel further comprises a second gas inlet and a second extension gas duct. The first gas inlet is arranged on the outlet side of the lower half of the arc extinguishing grid assembly. The first extension gas duct starts from the first gas inlet and extends obliquely upward. The second gas inlet is arranged on the outlet side of the upper half of the arc extinguishing grid assembly. The second extension gas duct starts from the second gas inlet and extends obliquely downward.

[0006] Preferably, the substrate comprises a first side panel and a second side panel, the first air inlet and the first air duct are arranged on the first side panel, and the second air inlet and the second air duct are arranged on the second side panel.

[0007] Preferably, the window is formed by a plurality of window walls connected end to end, and two diagonal notches are arranged on one of the window walls corresponding to the outlet side of the arc extinguishing grid assembly, serving as the first air inlet and the second air inlet respectively.

[0008] Preferably, the first side panel is located on the right side of the substrate, and the second side panel is located on the left side of the substrate, the right half of the arc extinguishing grid assembly corresponds to the first air inlet, and the left half of the arc extinguishing grid assembly corresponds to the second air inlet.

[0009] Preferably, the first air duct and / or the second air duct is a zigzag channel or an arc-shaped channel.

[0010] Preferably, the first air duct and the second air duct are two-section zigzag channels, the first air duct extends obliquely upward first and then vertically upward, and the second air duct extends obliquely downward first and then vertically downward.

[0011] Preferably, the first air duct and / or the second air duct is provided with at least two parallel air ducts.

[0012] Preferably, the first air duct and / or the second air duct is provided with a guide plate inclined to the inner wall of the air duct, and the guide plate gradually moves away from the inner wall of the air duct from the upstream to the downstream of the first air duct or the second air duct.

[0013] The embodiment also provides a switch electric appliance, which comprises a movable contact and a stationary contact for controlling the on or off of a circuit, and an arc extinguishing chamber for extinguishing an arc generated when the movable contact and the stationary contact are disconnected, wherein the arc extinguishing chamber comprises the arc extinguishing chamber exhaust structure described above.

[0014] Preferably, the switch electric appliance is a circuit breaker.

[0015] Preferably, the circuit breaker is a double-pole circuit breaker, which comprises an L-pole conduction system, an N-pole conduction system, a base, and a first side cover, the base and the first side cover are connected to form an internal space for mounting the L-pole conduction system and the N-pole conduction system, the substrate is arranged between the base and the first side cover to separate the L-pole conduction system and the N-pole conduction system, the L-pole conduction system comprises the arc extinguishing chamber, and the N-pole conduction system is provided with a third exhaust channel.

[0016] Preferably, the relative joint direction of the base and the first side cover is defined as the left-right direction, wherein the first side cover is located on the left side of the base, and the base is located on the right side of the first side cover; the first extension air channel downstream is also connected with a first air outlet channel, the first air outlet channel extends to the left to discharge air from the left end surface of the first side cover; the second extension air channel downstream is also connected with a second air outlet channel, the second air outlet channel extends to the left to discharge air from the left end surface of the first side cover.

[0017] Preferably, the third air outlet channel also discharges air from the left end surface of the first side cover.

[0018] Preferably, the outer angle of the joint of the first extension air channel and the first air outlet channel is an arc chamfer or an inclined chamfer, and the outer angle of the joint of the second extension air channel and the second air outlet channel is an arc chamfer or an inclined chamfer.

[0019] Preferably, the channel cavity wall of the air outlet channel is partially formed on the base plate, the base and the first side cover, and the air outlet channel is formed by the joint of the base plate and the base and the first side cover on both sides of the base plate.

[0020] The application has the following beneficial effects: the first air inlet is arranged at the lower half of the arc extinguishing grid assembly, and the second air inlet is arranged at the upper half of the arc extinguishing grid assembly, so that the lower half arc extinguishing grid and the upper half arc extinguishing grid of the arc extinguishing grid assembly can be exhausted respectively, so that the exhaust of the arc extinguishing chamber is not only faster, but also more uniform. The first extension air channel extends obliquely upward, and the second extension air channel extends obliquely downward. The obliquely extending air channel helps to lengthen the length of the exhaust channel and enhance the gas cooling effect. The first extension air channel and the second extension air channel are arranged in a cross layout, which compactly utilizes the internal space of the circuit breaker. Compared with the conventional exhaust channel structure extending in the length direction of the circuit breaker, the application can also occupy the length space of the circuit breaker as little as possible, and the miniaturization of the appearance size of the circuit breaker and the longer length of the exhaust channel are considered. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a perspective view of the circuit breaker in the embodiment;

[0022] Figure 2 is an exploded view of the structure of the circuit breaker in the embodiment;

[0023] Figure 3 is a top view of the circuit breaker in the embodiment;

[0024] Figure 4 is Figure 3 is a sectional view at A-A in the embodiment, showing the first air inlet and the first extension air channel on the right side of the base plate;

[0025] Figure 5 is a left view of the circuit breaker after the first side cover is removed in the embodiment, showing the second air inlet and the second extended air duct on the left side of the base plate;

[0026] Figure 6 is a left view of the circuit breaker in the embodiment;

[0027] Figure 7 is Figure 6 is a sectional view at B-B;

[0028] Figure 8 is a perspective view of the base plate in the embodiment (angle 1);

[0029] Figure 9 is a perspective view of the base plate in the embodiment (angle 2). DETAILED DESCRIPTION

[0030] To further explain the embodiments, the present application provides accompanying drawings. These accompanying drawings are part of the disclosure of the present application, which mainly serve to illustrate the embodiments, and can be used to explain the operating principles of the embodiments in conjunction with the relevant description of the specification. Those of ordinary skill in the art should be able to understand other possible implementations and advantages of the present application in conjunction with these contents. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0031] The present application will be further described in conjunction with the accompanying drawings and specific embodiments.

[0032] Referring to Figure 1 , 2 , as a preferred embodiment of the present application, a circuit breaker is provided, which is a double-pole circuit breaker, comprising a housing, an L-pole conduction system 10 and an N-pole conduction system 20, wherein the housing further comprises a base 2 and a first side cover 1 and a second side cover 3 respectively joined on both sides of the base 2, the first side cover 1 and the base 2 are oppositely joined to form an internal space for mounting the L-pole conduction system 10 and the N-pole conduction system 20, and the second side cover 3 and the base 2 are oppositely joined to form an internal space for mounting a control unit 30, which in this embodiment comprises an electromagnetic release and a release mechanism. A base plate 4 is fixedly mounted between the first side cover 1 and the base 2, and separates the L-pole conduction system 10 and the N-pole conduction system 20 by the base plate 4. Among them, the L-pole conduction system 10 comprises an arc extinguishing chamber 6 (see Figure 5 ), which comprises an arc extinguishing grid assembly 5 composed of a plurality of arc extinguishing grids oppositely arranged at intervals. For ease of description, in this embodiment, it is defined that:

[0033] the relative arrangement direction of the arc extinguishing grids is the up-down direction, which is also the height direction of the circuit breaker, that is Figure 2The "Y1-Y2" direction is the up-down direction, wherein the Y1 direction is upward and the Y2 direction is downward.

[0034] The relative engagement direction of the base 2 and the first side cover 1 is the left-right direction, which is also the width direction of the circuit breaker, wherein the first side cover 1 is on the left side of the base 2, and the base 2 is on the right side of the first side cover 1, that is Figure 2 The X1 direction is leftward and the X2 direction is rightward.

[0035] Referring to Figure 2 , 4 -9, the base plate 4 is provided with a window 41 for accommodating the arc extinguishing grid assembly 5, and at the edge of the window 41 on the gas outlet side of the arc extinguishing grid assembly 5 (i.e., the downstream side of the arc extinguishing grid assembly 5 on the gas travel path in the arc extinguishing chamber), an exhaust passage for discharging arc and ionized gas is provided, which includes a first exhaust passage 71 and a second exhaust passage 72. The first exhaust passage 71 further includes a first gas inlet 710 and a first extended gas channel 711, and the second exhaust passage 72 further includes a second gas inlet 720 and a second extended gas channel 721. The first gas inlet 710 is correspondingly arranged at the outlet side of the lower half of the arc extinguishing grid assembly 5, the first extended gas channel 711 starts from the first gas inlet 710 and extends obliquely upward, the second gas inlet 720 is correspondingly arranged at the outlet side of the upper half of the arc extinguishing grid assembly 5, and the second extended gas channel 721 starts from the second gas inlet 720 and extends obliquely downward. In this embodiment, the first gas inlet 710 is correspondingly arranged at the lower half of the arc extinguishing grid assembly 5, and the second gas inlet 720 is correspondingly arranged at the upper half of the arc extinguishing grid assembly 5, so that the lower half of the arc extinguishing grid assembly 5 and the upper half of the arc extinguishing grid assembly 5 can be exhausted respectively, so that the exhaust of the arc extinguishing chamber is not only faster, but also more uniform. The first extended gas channel 711 extends obliquely upward, and the second extended gas channel 721 extends obliquely downward. The obliquely extending gas channel helps to lengthen the length of the exhaust passage and enhance the gas cooling effect. The first extended gas channel 711 and the second extended gas channel 721 are arranged in a cross layout, which compactly utilizes the internal space of the circuit breaker. Compared with the conventional exhaust passage structure extending in the length direction of the circuit breaker (the direction perpendicular to the up-down direction and the left-right direction is the length direction of the circuit breaker), this embodiment can also occupy the length space of the circuit breaker as little as possible, and can also consider the miniaturization of the external dimensions of the circuit breaker and the longer length of the exhaust passage.

[0036] The substrate 4 comprises a first side plate surface 401 and a second side plate surface 402 opposite to each other, the first side plate surface 401 is located at the right side of the substrate 4, and the second side plate surface 402 is located at the left side of the substrate 4. The first air inlet 710 and the first extension air duct 711 are arranged on the first side plate surface 401, and the second air inlet 720 and the second extension air duct 721 are arranged on the second side plate surface 402. The window 41 is formed by a plurality of window walls connected in sequence, and two diagonal notches are arranged on one of the window walls 411 corresponding to the outlet side of the arc extinguishing grid assembly 5, which are respectively used as the first air inlet 710 and the second air inlet 720. In this way, the left-right direction window thickness space of the window 41 of the substrate 4 is used to arrange the two air exhaust channels, and the left-right direction installation space is not additionally occupied, which is beneficial to the miniaturization of the circuit breaker. Moreover, the first air inlet 710 and the second air inlet 720 are arranged on the right and left sides, respectively, and correspond to the right half arc extinguishing grid and the left half arc extinguishing grid of the arc extinguishing grid assembly 5, respectively, which further makes the exhaust more uniform.

[0037] In the embodiment, the first extension air duct 711 and the second extension air duct 721 are two-segment folded line channels, the first extension air duct 711 extends obliquely upward first and then vertically upward, and the second extension air duct 721 extends obliquely downward first and then vertically downward. Of course, in other embodiments, the first extension air duct 711 or the second extension air duct 721 can also be a three-segment or four-segment folded line channel, or an arc line channel, as long as the overall extension trend is obliquely upward or obliquely downward. In the embodiment, the first extension air duct 711 and the second extension air duct 721 are arranged as two-segment folded line channels to facilitate their manufacture and also to ensure that the first extension air duct 711 and the second extension air duct 721 have a relatively long extension length.

[0038] In the embodiment, the first extension air duct 711 and the second extension air duct 721 are both arranged with two parallel air ducts. In other embodiments, the first extension air duct 711 and / or the second extension air duct 721 can also be arranged with only one air duct, or three parallel air ducts, four parallel air ducts, etc. The more air ducts the first extension air duct 711 and the second extension air duct 721 have, the more air duct cavity walls they have, which is more conducive to the cooling of the gas, but the more difficult the manufacture is. In the embodiment, the two first extension air ducts 711 and the two second extension air ducts 721 can balance the gas cooling effect and the manufacturing difficulty.

[0039] In the embodiment, the first extension air duct 711 and the second extension air duct 721 are both arranged with two parallel air ducts. In other embodiments, the first extension air duct 711 and / or the second extension air duct 721 can also be arranged with only one air duct, or three parallel air ducts, four parallel air ducts, etc. The more air ducts the first extension air duct 711 and the second extension air duct 721 have, the more air duct cavity walls they have, which is more conducive to the cooling of the gas, but the more difficult the manufacture is. In the embodiment, the two first extension air ducts 711 and the two second extension air ducts 721 can balance the gas cooling effect and the manufacturing difficulty. Figure 5 In the embodiment, the first extension air duct 711 and the second extension air duct 721 are both arranged with two parallel air ducts. In other embodiments, the first extension air duct 711 and / or the second extension air duct 721 can also be arranged with only one air duct, or three parallel air ducts, four parallel air ducts, etc. The more air ducts the first extension air duct 711 and the second extension air duct 721 have, the more air duct cavity walls they have, which is more conducive to the cooling of the gas, but the more difficult the manufacture is. In the embodiment, the two first extension air ducts 711 and the two second extension air ducts 721 can balance the gas cooling effect and the manufacturing difficulty.

[0040] Referring to Figure 1 , 7, the first extension air passage 711 downstream is further communicated with a first air outlet passage 712, the first air outlet passage 712 extends leftwards to air outlet from the left end face of the first side cover 1, and the corresponding air outlet is a first air outlet 11 arranged on the left end face of the first side cover 1. The second extension air passage 721 downstream is further communicated with a second air outlet passage 722, the second air outlet passage extends leftwards to air outlet from the left end face of the first side cover 1, and the corresponding air outlet is a second air outlet 12 arranged on the left end face of the first side cover 1. For the N pole conduction system 20, a third air outlet passage 8 (see Figure 4 ) is arranged, which finally air outlets leftwards from the left end face of the first side cover 1, and the corresponding air outlet is a third air outlet 13 arranged on the left end face of the first side cover 1. Thus, in the embodiment, the L pole conduction system 10 and the N pole conduction system 20 finally air outlet leftwards, i.e. from the circuit breaker width direction, avoiding the air outlet passage occupying the space in the length direction of the circuit breaker, which is beneficial to the miniaturization design of the circuit breaker in the length direction.

[0041] In the embodiment, the outer angle of the connection between the first extension air passage 711 and the first air outlet passage 712 is an arc chamfer 9 (or also can be a bevel chamfer), and the outer angle of the connection between the second extension air passage 721 and the second air outlet passage 722 is also the same chamfer structure, so as to guide the bending trend of the gas through the chamfer structure and improve the air outlet speed. Of course, the same chamfer structure can also be adopted for the passage turning part of the third air outlet passage 8.

[0042] As Figure 2 , 7 In the embodiment, the passage cavities of the air outlet passages are partly formed on the base plate 4, the base 2 and the first side cover 1, and the air outlet passages are formed by the base plate 4 and the base 2 and the first side cover 1 on the left and right sides of the base plate 4 being connected, which is beneficial to reducing the manufacturing difficulty and facilitating the assembly of the product.

[0043] The arc extinguishing chamber and the arc extinguishing chamber air outlet structure adopted in the embodiment can be applied not only in circuit breakers but also in other switch electric appliances, such as disconnectors.

[0044] Although the present application is specifically shown and introduced in combination with the preferred embodiments, those skilled in the art should understand that various changes can be made to the present application in form and details without departing from the spirit and scope of the present application defined in the appended claims, which all fall within the protection scope of the present application.

Claims

1. An arc-extinguishing chamber exhaust structure, comprising an arc-extinguishing grid assembly and a substrate, wherein the arc-extinguishing grid assembly is composed of a plurality of arc-extinguishing grids arranged at relative intervals, and the relative arrangement direction of the arc-extinguishing grids is defined as the up-down direction, characterized in that: The substrate has a window for housing the arc-extinguishing grid assembly. An exhaust channel is provided along the edge of the window located on the outlet side of the arc-extinguishing grid assembly. The exhaust channel includes a first exhaust channel and a second exhaust channel. The first exhaust channel further includes a first air inlet and a first extended air passage. The second exhaust channel further includes a second air inlet and a second extended air passage. The first air inlet is correspondingly located on the outlet side of the lower half of the arc-extinguishing grid plate assembly, and the first extended air passage starts from the first air inlet and extends obliquely upward. The second air inlet is correspondingly located on the outlet side of the upper half of the arc-extinguishing grid plate of the arc-extinguishing grid plate assembly, and the second extended air passage starts from the second air inlet and extends obliquely downward.

2. The arc-extinguishing chamber exhaust structure according to claim 1, characterized in that: The substrate includes a first side panel and a second side panel with different shapes. The first air inlet and the first extended air passage are disposed on the first side panel, and the second air inlet and the second extended air passage are disposed on the second side panel.

3. The arc-extinguishing chamber exhaust structure according to claim 2, characterized in that: The window is formed by connecting several window walls end to end. On one of the window walls corresponding to the outlet side of the arc-extinguishing grid assembly, there are two diagonally arranged notches, which serve as the first air inlet and the second air inlet, respectively.

4. The arc-extinguishing chamber exhaust structure according to claim 2, characterized in that: With the first side plate facing each other on the right side of the substrate and the second side plate facing each other on the left side of the substrate, the right half of the arc-extinguishing grid plate of the arc-extinguishing grid plate assembly corresponds to the first air inlet, and the left half of the arc-extinguishing grid plate of the arc-extinguishing grid plate assembly corresponds to the second air inlet.

5. The arc-extinguishing chamber exhaust structure according to claim 1, characterized in that: The first extended airway and / or the second extended airway are zigzag or arc-shaped channels.

6. The arc-extinguishing chamber exhaust structure according to claim 5, characterized in that: The first and second extended airways are two-segment zigzag channels. The first extended airway extends obliquely upward first and then vertically upward, while the second extended airway extends obliquely downward first and then vertically downward.

7. The arc-extinguishing chamber exhaust structure according to claim 1, characterized in that: The first exhaust passage and / or the second exhaust passage are each provided with at least two parallel exhaust passages.

8. The arc-extinguishing chamber exhaust structure according to claim 1, characterized in that: The inner wall of the first extended airway and / or the second extended airway is provided with a guide plate inclined to the inner wall of the channel; from upstream to downstream of the first extended airway and / or the second extended airway, the guide plate gradually moves away from the inner wall of the channel.

9. A switching device, comprising a moving contact and a stationary contact for controlling the connection or disconnection of a circuit, and further comprising an arc-extinguishing chamber for extinguishing the arc generated when the moving contact and the stationary contact are disconnected, characterized in that: The arc-extinguishing chamber includes the arc-extinguishing chamber exhaust structure as described in any one of claims 1-8.

10. The switching device according to claim 9, characterized in that: The switching device is a double-pole circuit breaker, including an L-pole conductive system, an N-pole conductive system, a base, and a first side cover. The base and the first side cover are joined to form an internal space for mounting the L-pole conductive system and the N-pole conductive system. The base plate is disposed between the base and the first side cover to separate the L-pole conductive system and the N-pole conductive system. The L-pole conductive system includes the arc-extinguishing chamber, and the N-pole conductive system is provided with a third exhaust channel.

11. The switching device according to claim 10, characterized in that: The relative engagement direction of the base and the first side cover is defined as the left-right direction, wherein the first side cover is disposed on the left side of the base and the base is disposed on the right side of the first side cover; the downstream of the first extended air passage is also connected to a first air outlet channel, which extends to the left to exit air from the left end face of the first side cover; the downstream of the second extended air passage is also connected to a second air outlet channel, which extends to the left to exit air from the left end face of the first side cover.

12. The switching device according to claim 11, characterized in that: The third exhaust channel also exits from the left end face of the first side cover; and / or The outer corner at the connection between the first extended airway and the first air outlet channel is a rounded chamfer or a beveled chamfer; and / or the outer corner at the connection between the second extended airway and the second air outlet channel is a rounded chamfer or a beveled chamfer; The first exhaust channel and the second exhaust channel each have a portion of their channel cavity wall formed on the substrate, the base and the first side cover. The first exhaust channel and the second exhaust channel are formed by the substrate and the base and the first side cover on both sides of it being joined together.

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