Contact arc extinguishing system and circuit breaker
By designing multiple spaced stacked arc-extinguishing grids and closed areas and flow channels to control gas flow in traditional AC arc-extinguishing chambers and contact arc-extinguishing systems, the problems of difficulty in extinguishing arcs and metal particles in traditional systems are solved, and the effective extinguishing of arcs and efficient arc-blowing capabilities of circuit breakers are achieved.
Patent Information
- Application Number
- CN202420616134.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-27
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-03-27
AI Technical Summary
Traditional AC arc extinguishing chambers and contact arc extinguishing systems have difficulties in extinguishing DC arcs, including problems such as difficulty in extinguishing the arc and ejecting metal particles, which leads to difficulty in increasing the arc voltage.
A contact arc extinguishing system is designed, including an arc extinguishing chamber, an arc extinguishing chamber, a moving contact and a static contact in the shell. A multiple arc extinguishing grid plates are provided in the arc extinguishing chamber with spaced stacks. The gas flow is controlled through the sealed area and the flow channel, and the arc is guided to lengthen and cool in the arc extinguishing chamber, and the ejection of metal particles is reduced through the arc extinguishing chamber.
It realizes effective extinguishing of the arc, improves the arc blowing ability of the circuit breaker, is suitable for AC and DC arc extinguishing, enhances the repulsion between the dynamic and static contacts, and promotes the rapid arc pulling and cooling of the arc.
Smart Images
Figure CN222785248U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of low-voltage electrical appliances, in particular to a contact arc extinguishing system and a circuit breaker. Background Art
[0002] Traditional AC arc extinguishing chambers and contact arc extinguishing systems are used to disconnect DC, and the arc voltage is difficult to increase. One reason is that the traditional AC fluid flow channel design makes it easier for the arc to rush out of the arc extinguishing chamber, causing the arc to be elongated and insufficiently extinguished, and metal particles are easily ejected. The arc voltage is further difficult to increase, resulting in difficulty in extinguishing the DC arc; the second reason is that the number of arc extinguishing grids is small. Summary of the invention
[0003] The utility model aims to overcome at least one defect of the prior art and provide a contact arc extinguishing system and a circuit breaker.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] A contact arc extinguishing system comprises an arc extinguishing chamber, an arc extinguishing chamber, a moving contact and a static contact located below the moving contact, wherein a plurality of arc extinguishing grids are arranged in the arc extinguishing chamber, and the plurality of arc extinguishing grids are arranged in a stacked manner from the bottom to the top of the arc extinguishing chamber, the bottom of the arc extinguishing chamber is close to the static contact, and the top is close to the disconnecting position of the moving contact, the moving contact has a moving contact for cooperating with the static contact, the moving contact is arranged on the arc inlet side of one side of the arc extinguishing chamber, the arc extinguishing chamber is arranged between the gas outlet side of the other side of the arc extinguishing chamber and the gas outlet of the shell, when the moving contact is in the disconnecting position, a closed area communicating with the arc inlet side of the arc extinguishing chamber is formed below the moving contact, the arc extinguishing chamber is opposite to the upper area of the gas outlet side of the arc extinguishing chamber near the top and is spaced to form a flow gap, the gas outlet side of the arc extinguishing chamber is also provided with a guide channel opposite to the lower area of the gas outlet side of the arc extinguishing chamber near the bottom, and the lower area of the gas outlet side of the arc extinguishing chamber near the bottom is communicated with the flow gap through the guide channel.
[0006] Optionally, it also includes a slide plate connected to the moving contact, and there is a movable gap between the bottom surface where the moving contact point of the moving contact is located and the bottom wall of the shell. During the rotation of the slide plate with the moving contact, it is always blocked between the arc extinguishing chamber and the side of the moving contact away from the arc extinguishing chamber, and surrounds the bottom wall of the shell to form the enclosed area.
[0007] Optionally, the U-shaped plate at one end of the slide is wrapped around the moving contact and abuts against the moving contact, and the other end of the slide is bent toward the bottom wall of the shell to form an arc plate for sliding cooperation with the guide arc wall on the bottom wall of the shell.
[0008] Optionally, it also includes a magnetic blowing system, which is fixed on the stationary contact and located on a side of the stationary contact away from the moving contact.
[0009] Optionally, the arc extinguishing chamber comprises two arc extinguishing plates arranged at intervals, the plurality of arc extinguishing grids are vertically arranged between the two arc extinguishing plates, and the plurality of arc extinguishing grids are arranged in parallel and at intervals.
[0010] Optionally, a gas outlet channel is provided in the shell, the gas outlet and the arc extinguishing chamber are arranged on both sides of the gas outlet channel, and a diversion part for diverting the gas discharged from the arc extinguishing chamber is provided in the gas outlet channel.
[0011] Optionally, the diversion portion is a cylindrical structure arranged between the top wall and the bottom wall of the gas outlet channel, spaced apart from the side wall of the gas outlet channel to form a branch, and the cylindrical structure is provided with a diversion protrusion protruding toward the arc extinguishing chamber on the side close to the arc extinguishing chamber.
[0012] Optionally, the arc extinguishing chamber includes a plurality of arc extinguishing grids.
[0013] Optionally, the guide channel widens from narrow to wide from bottom to top.
[0014] Optionally, it also includes a guide plate, one end of which is connected, in contact with or spaced apart from the bottom of the arc extinguishing chamber, and the other end of the guide plate is in contact with or spaced apart from the bottom surface of the arc extinguishing chamber, and is opposite to and spaced apart from the lower area of the gas outlet side of the arc extinguishing chamber near the bottom to form the guide channel.
[0015] Optionally, the guide plate includes a vertical section of the guide plate, an arc section of the guide plate and an inclined section of the guide plate which are connected in sequence, the bottom end of the vertical section of the guide plate is connected to the guide plate mounting portion and is arranged in close contact with or spaced apart from the gas outlet side of the arc extinguishing chamber, the notch of the arc section of the guide plate is arranged away from the arc extinguishing chamber, the top end of the inclined section of the guide plate is in contact with or spaced apart from the bottom surface of the arc extinguishing chamber, and is inclined in a direction away from the arc extinguishing chamber.
[0016] Optionally, the guide plate mounting portion at one end of the guide plate is mounted on the static contact, the arc extinguishing chamber is mounted on the guide plate mounting portion, and the bottom surface of the arc extinguishing chamber is fitted and connected to the guide plate mounting portion.
[0017] A circuit breaker comprises any one of the contact arc extinguishing systems described above.
[0018] The contact arc extinguishing system and circuit breaker of the utility model control the gas flow from bottom to top through the enclosed area at the lower arc inlet side of the arc extinguishing chamber, thereby guiding the arc to be elongated and cooled in the arc extinguishing chamber, thereby effectively extinguishing the arc; guide the gas to flow from bottom to top into the arc extinguishing chamber through the guide channel at the lower gas outlet side of the arc extinguishing chamber to reduce the ejection of metal particles, thereby improving the arc blowing ability of the circuit breaker, thereby achieving the effect of effective arc extinguishing, and can be suitable for AC arc extinguishing and DC arc extinguishing.
[0019] In addition, when the circuit breaker is disconnected, the magnetic blow system enhances the repulsive force between the moving and static contacts, allowing the moving contact to open faster and the arc to be drawn more quickly.
[0020] In addition, by setting a diversion part to adjust the exhaust gas flow channel, the outlet channel is diverted, so that the gas ejection direction and flow rate are limited to prevent the interrupting arc voltage from being reduced due to an external arc short circuit. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a structural schematic diagram of the contact arc extinguishing system of the utility model;
[0022] Figure 2 It is a schematic diagram of the fluid flow of the contact arc extinguishing system of the utility model;
[0023] Figure 3 It is a schematic diagram of the fluid flow of the upper cover of the utility model;
[0024] Figure 4 It is an assembly diagram of the movable contact and the slide plate of the utility model;
[0025] Figure 5 It is a structural schematic diagram of the utility model skateboard;
[0026] Figure 6 It is a cross-sectional view of the arc extinguishing chamber of the utility model;
[0027] Figure 7 It is a three-dimensional diagram of the arc extinguishing chamber of the utility model;
[0028] Figure 8 It is an exploded view of the arc extinguishing chamber of the utility model;
[0029] Fig. 9 It is a structural schematic diagram of the guide plate of the utility model;
[0030] Slide plate 1; enclosed area 10; arc plate 11; U-shaped plate 12; slot 121; extension arm 122; moving contact 2; moving contact 21; magnetic blowing system 3; static contact 4; guide plate 5; guide channel 50; guide plate mounting portion 51; guide plate vertical section 52; guide plate arc section 53; guide plate inclined section 54; guide plate support section 55; mounting hole 551; reinforcing rib 56; arc extinguishing chamber 6; arc extinguishing grid 61; arc isolation plate 62; reflection chamber 63; slot 631; arc extinguishing grid 7; flow gap 70; upper cover 8; air outlet 80; diversion portion 81; diversion protrusion 811; tributary 812; guide arc wall 82. DETAILED DESCRIPTION
[0031] The following embodiments are given in conjunction with the accompanying drawings to further illustrate the specific implementation of the contact arc extinguishing system and circuit breaker of the utility model. The contact arc extinguishing system and circuit breaker of the utility model are not limited to the description of the following embodiments.
[0032] like Figure 1-3As shown, the circuit breaker of this embodiment includes a housing, an operating mechanism (not shown in the figure) and one or more contact arc extinguishing systems. The contact arc extinguishing system of this embodiment includes an arc extinguishing chamber 6 installed in the housing, an arc extinguishing chamber, a moving contact 2 and a static contact 4 located below the moving contact 2. The housing includes an upper cover 8 and a base, and the upper cover 8 is covered on the base to form a chamber. The moving contact 2 has a moving contact 21 for cooperating with the static contact 4. The moving contact 2 is arranged on the arc inlet side of one side of the arc extinguishing chamber 6, and the arc extinguishing chamber is arranged between the gas outlet side of the other side of the arc extinguishing chamber 6 and the gas outlet 80 of the upper cover 8 of the housing. A plurality of arc extinguishing grids 61 are arranged in the arc extinguishing chamber 6, and the plurality of arc extinguishing grids 61 are arranged in a stacked manner from the bottom to the top of the arc extinguishing chamber 6. The bottom of the arc extinguishing chamber 6 is close to the static contact 4, and the top is close to the disconnection position of the moving contact 2. The operating mechanism is connected to the moving contact 2, and the operating mechanism drives the moving contact 2 and the static contact 4 to open and close to realize the circuit breaker being disconnected or connected. The position of the moving contact 2 when the circuit breaker is disconnected is the disconnecting position, and the position of the moving contact 2 when it is in contact with the static contact 4 when the circuit breaker is connected is the closing position. The contact arc extinguishing system is used to extinguish the arc generated during the opening and closing process of the moving contact 2 and the static contact 4.
[0033] In particular, when the moving contact 2 is in the disconnecting position, a closed area 10 is formed below the moving contact 2 and communicates with the arc-entry side of the arc-extinguishing chamber 6. The arc-extinguishing chamber is opposite to the upper area of the gas outlet side of the arc-extinguishing chamber 6 near the top and is separated to form a flow gap 70. The gas outlet side of the arc-extinguishing chamber 6 is also provided with a guide channel 50 opposite to the lower area of the gas outlet side of the arc-extinguishing chamber 6 near the bottom. The lower area of the gas outlet side of the arc-extinguishing chamber 6 near the bottom is communicated with the flow gap 70 through the guide channel 50. When the circuit breaker is disconnected, the arc enters the arc-extinguishing chamber 6 from the arc-entry side and is extinguished to generate high-temperature and high-pressure gas. As the gas pressure in the closed area 10 increases, a high-pressure cavity is formed, so that the gas flow direction can be controlled and utilized. The gas flow direction is in the same direction as the movement direction of the moving contact 2, such as Figure 2 As shown, the arc extinguishing cavity formed by the arc extinguishing chamber 6 communicating with the enclosed area 10 presents a lower pressure on the left side than on the right side, and a lower pressure on the top than on the bottom, so that the arc can be rapidly stretched and cooled with the flow of gas; after the gas is discharged from the arc extinguishing chamber 6 from the gas outlet side, it passes through the guide channel 50 or directly enters the flow gap 70, and then passes through the arc extinguishing chamber and finally exits the housing from the gas outlet 80. The contact arc extinguishing system and circuit breaker of this embodiment control the gas flow from bottom to top through the enclosed area 10 at the lower arc inlet side of the arc extinguishing chamber 6, thereby guiding the arc to stretch and cool in the arc extinguishing chamber 6, so as to effectively extinguish the arc, and guide the gas to flow from bottom to top into the arc extinguishing chamber through the guide channel 50 at the lower gas outlet side of the arc extinguishing chamber 6 to reduce the ejection of metal particles, improve the arc blowing ability of the circuit breaker, and achieve the effect of effective arc extinguishing, which can be applicable to AC arc extinguishing and DC arc extinguishing.
[0034] like Figure 1-2 , Figure 4-5As shown, the contact arc extinguishing system of this embodiment also includes a slide plate 1 linked to the moving contact 2, and there is a movable gap between the bottom surface where the moving contact 21 of the moving contact 2 is located and the bottom wall of the shell. The slide plate 1 is always blocked between the arc extinguishing chamber 6 and the side of the moving contact 2 away from the arc extinguishing chamber 6 during the rotation of the moving contact 2, and is surrounded by the bottom wall of the shell to form the closed area 10, and the closed area 10 is connected to the arc-entry side of the arc extinguishing chamber 6. The moving contact 2 and the slide plate 1 together isolate the arc extinguishing chamber 5 from the side of the moving contact 2 away from the arc extinguishing chamber 6, as shown in FIG. Figure 2 As shown, when the moving contact 2 is in the disconnecting position, the cross section of the enclosed area 10 is approximately V-shaped toward the flow gap 70, and the space of the enclosed area 10 gradually becomes larger toward the flow gap 70.
[0035] The slide plate 1 in this embodiment is an integrally formed structure, including a U-shaped plate 12 and an arc-shaped plate 11. The U-shaped plate 12 has a slot 121 that cooperates with the moving contact 2. The U-shaped plate at one end of the slide plate 1 is wrapped around the moving contact 2 through the slot 121 and abuts against the moving contact 21. The other end of the slide plate 1 is bent toward the bottom wall of the shell to form an arc-shaped plate 11, which is used to slide with the guide arc-shaped wall 82 on the bottom wall of the shell. The two arms of the U-shaped plate 12 extend from the side connected to the arc-shaped plate 11 to form extension arms 122 for clamping the moving contact 2, so that the connection between the slide plate 1 and the moving contact 2 is more secure. Specifically, a blocking protrusion is provided on the bottom wall of the shell, and a guiding arc-shaped wall 82 is provided on the side of the blocking protrusion away from the enclosed area 10. When the slide plate 1 rotates with the moving contact 2, the arc-shaped plate 11 always keeps sliding on the guiding arc-shaped wall 82. The moving contact 2 is mounted on the contact shaft and rotates with the contact shaft. The slide plate 1 is arranged on the moving contact 2 or the contact shaft. The slide plate 1 always seals the side of the moving contact 2 away from the arc extinguishing chamber 6 during the rotation of the moving contact 2, and isolates the arc extinguishing chamber 5 from the side of the moving contact 2 away from the arc extinguishing chamber 6. It is used to form a closed area 10 and can also be used as a protective plate for the moving contact 2 to prevent high-temperature gas from spraying toward the moving contact 2. Of course, as other embodiments, the slide plate 1 may not be arranged on the moving contact 2. For example, it can be arranged on the housing to form a closed area 10 located below the moving contact 21 and connected to the arc extinguishing chamber 6. For example, the slide plate 1 is slidably arranged on the housing. When the moving contact 2 is disconnected, the slide plate 1 is driven by the spring to slide and seal the side of the moving contact 2 away from the arc extinguishing chamber 6. When the moving contact 2 is in contact and closed with the static contact 4, the moving contact 2 pushes the slide plate 1 to slide and compress the spring.
[0036] like Figure 1-2As shown, the contact arc extinguishing system of this embodiment also includes a magnetic blowing system 3, which is fixed to the static contact 4 by fasteners such as screws and is located between the static contact 4 and the housing. The magnetic blowing system 3 is located on the side of the static contact 4 away from the moving contact 21. Of course, the magnetic blowing system 3 can also be fixed to the housing. The magnetic blowing system 3 of this embodiment includes one or more magnets, which can be permanent magnets or electromagnets. When the circuit breaker is disconnected, the magnetic blowing system 3 enhances the repulsive force between the moving and static contacts 4 to make the moving contact 2 open faster, making the arcing faster.
[0037] like Figure 6-8 As shown, the arc extinguishing chamber 6 of this embodiment includes two arc extinguishing plates 62 arranged at intervals, and the plurality of arc extinguishing grids 61 are vertically arranged between the two arc extinguishing plates 62, that is, Figure 7-8 The arc-isolating plate 62 is vertically arranged, the arc-extinguishing grid 61 is horizontally arranged, and the plurality of arc-extinguishing grids 61 are arranged in parallel and spaced apart. The arc-extinguishing grids 61 are fixed to the arc-isolating plate 62 by clamping, and clamping protrusions are provided on both sides of the arc-extinguishing grid 61 for clamping with the clamping holes on the arc-isolating plate 62. The parallel arrangement of the arc-extinguishing grids 61 in the arc-extinguishing chamber 6 can maximize the space utilization, increase the number of arc-extinguishing grids 61, and thus increase the arc voltage. Of course, the arc-extinguishing grids 61 can also be arranged slightly tilted. The arc extinguishing chamber 6 is further provided with a reflection chamber 63 located at the arc-entry side of the arc extinguishing grid 61. The arc-entry notch provided at the arc-entry side of the arc extinguishing grid 61 separates the arc-entry side of the arc extinguishing grid 61 to form two pins. The reflection chamber 63 is provided with an avoidance gap in the middle and two rows of slots 631 located on both sides for corresponding to two pins of a plurality of arc extinguishing grids 61. Each row of slots 631 includes the same number of slots 631 as the arc extinguishing grid 61. The two pins of each arc extinguishing grid 61 are correspondingly inserted into the two slots 631 of the reflection chamber 63. The side of the moving contact 2 provided with the moving contact 21 extends into the avoidance gap of the reflection chamber 63. The reflection chamber 63 plays a role in cooling the high-temperature free gas.
[0038] like Figure 1-3 As shown, the arc extinguishing chamber of this embodiment includes a plurality of arc extinguishing grids 7. The arc extinguishing grids 7 may be one or more, and are used to absorb metal particles in the arc. The arc extinguishing grids 7 are provided with a plurality of arc extinguishing holes. The arc extinguishing grids 7 may be made of metal mesh, high temperature resistant insulating plastic, etc. The arc extinguishing grids of metal mesh and / or metal mesh of insulating plastic may be arranged in the arc extinguishing chamber 7.
[0039] like Figure 1-2 As shown, the shell is provided with an outlet channel, the outlet channel is horizontally arranged, and has a top wall and a bottom wall opposite to each other, and two side walls opposite to each other. The outlet port 80 and the arc extinguishing chamber are arranged on the left and right sides of the outlet channel, and the outlet channel is provided with a diverter 81 for diverting the gas discharged from the arc extinguishing chamber. Preferably, as Figure 3As shown, the diverter 81 is a cylindrical structure arranged between the top wall and the bottom wall of the gas outlet channel, and is spaced apart from the front and rear side walls of the gas outlet channel to form a branch 812. The cylindrical structure is provided with a diverter protrusion 811 protruding toward the arc extinguishing chamber on the side close to the arc extinguishing chamber. By setting the diverter 81 to adjust the exhaust gas flow channel, the gas outlet channel is diverted, and the gas ejection direction and flow rate are limited to prevent the arc voltage from being reduced due to an external arc short circuit. One or more diverters 81 can be provided. Of course, the diverter 81 can also be a structure such as a vertical plate or an arc plate.
[0040] like Figure 1-2 As shown, the contact arc extinguishing system of this embodiment also includes a guide plate 5, one end of the guide plate 5 is connected, in contact with or spaced apart from the bottom of the arc extinguishing chamber 6, and the other end of the guide plate 5 is in contact with or spaced apart from the bottom surface of the arc extinguishing chamber, and is opposite to and spaced apart from the lower area of the outlet side of the arc extinguishing chamber 6 near the bottom to form the guide channel 50. The guide plate mounting portion 51 at one end of the guide plate 5 is mounted on the static contact 4, the arc extinguishing chamber 6 is mounted on the guide plate mounting portion 51, and the bottom surface of the arc extinguishing chamber 6 is fitted and connected to the guide plate mounting portion 51. This structural design enables the guide channel 50 to be completely located on the side of the outlet side of the arc extinguishing chamber 6, which is convenient for better diversion and improves the arc extinguishing effect. The guide channel 50 widens from narrow to wide from bottom to top, and the guide plate mounting portion 51 plays a role in protecting the static contact 4. Specifically, as Fig. 9 As shown, the guide plate 5 is an integrally formed structure, including a guide plate vertical section 52, a guide plate arc section 53 and a guide plate inclined section 54 connected in sequence, the bottom end of the guide plate vertical section 52 is connected to the guide plate mounting portion 51 and is arranged in close contact with or spaced from the gas outlet side of the arc extinguishing chamber 6, the recess of the guide plate arc section 53 is arranged away from the arc extinguishing chamber 6, the top of the guide plate inclined section 54 is in contact with the bottom surface of the arc extinguishing chamber or spaced, and is inclined in the direction away from the arc extinguishing chamber 6, and the guide plate vertical section 52, the guide plate arc section 53 and the guide plate inclined section 54 are provided with reinforcing ribs 56 on the side facing the arc extinguishing chamber 6. The top of the guide plate inclined section 54 extends toward the gas outlet 80 in the horizontal direction to form a guide plate support section 55 as the bottom wall of the gas outlet channel. The guide plate support section 55 is provided with a mounting hole 551 for mounting the diverter 81. The top of the diverter 81 is integrally connected with the top wall of the gas outlet channel, and the bottom is inserted into the mounting hole 551 of the guide plate 5. The arc extinguishing chamber is placed on the guide plate support section 55. The guide plate 5 has a simple structure and is easy to manufacture. The guide plate 5 of this embodiment is separately arranged with the arc extinguishing chamber 6. Of course, as other embodiments, the guide plate 5 can also be integrally connected with the arc extinguishing grid 61 of the arc extinguishing chamber 6. For example, the guide plate mounting portion 51 is not provided, and the guide plate vertical section 52 is integrally connected with the arc extinguishing grid 61 at the bottom of the arc extinguishing chamber.
[0041] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.
[0042] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.
Claims
1. A contact arc extinguishing system, comprising an arc extinguishing chamber (6) installed in a housing, an arc extinguishing chamber, a moving contact (2) and a stationary contact (4) located below the moving contact (2), wherein a plurality of arc extinguishing grids (61) are arranged in the arc extinguishing chamber (6), and the plurality of arc extinguishing grids (61) are arranged in a stacked manner from the bottom to the top of the arc extinguishing chamber (6), the bottom of the arc extinguishing chamber (6) is close to the stationary contact (4), and the top is close to the disconnection position of the moving contact (2), the moving contact (2) has a moving contact point (21) for cooperating with the stationary contact (4), the moving contact (2) is arranged on the arc inlet side of one side of the arc extinguishing chamber (6), and the arc extinguishing chamber is arranged between the gas outlet side of the other side of the arc extinguishing chamber (6) and the gas outlet (80) of the housing, characterized in that: When the moving contact (2) is in the disconnected position, a closed area (10) communicating with the arc inlet side of the arc extinguishing chamber (6) is formed below the moving contact (2); the arc extinguishing chamber and the upper area of the gas outlet side of the arc extinguishing chamber (6) close to the top are opposite to each other and are spaced to form a flow gap (70); the gas outlet side of the arc extinguishing chamber (6) is also provided with a guide channel (50) opposite to the lower area of the gas outlet side of the arc extinguishing chamber (6) close to the bottom; the lower area of the gas outlet side of the arc extinguishing chamber (6) close to the bottom is communicated with the flow gap (70) through the guide channel (50).
2. The contact arc extinguishing system according to claim 1, characterized in that: It also comprises a slide plate (1) linked to the moving contact (2), a movable gap being provided between the bottom surface where the moving contact (21) of the moving contact (2) is located and the bottom wall of the shell, and the slide plate (1) is always blocked between the arc extinguishing chamber (6) and the side of the moving contact (2) away from the arc extinguishing chamber (6) during the process of rotating with the moving contact (2), and is surrounded by the bottom wall of the shell to form the enclosed area (10).
3. The contact arc extinguishing system according to claim 2, characterized in that: The U-shaped plate (12) at one end of the slide plate (1) is wrapped around the moving contact (2) and abuts against the moving contact (21), and the other end of the slide plate (1) is bent toward the bottom wall of the shell to form an arc-shaped plate (11) for slidingly cooperating with the guide arc-shaped wall (82) on the bottom wall of the shell.
4. The contact arc extinguishing system according to claim 1, characterized in that: It also includes a magnetic blowing system (3), which is fixed on the stationary contact (4) and located on a side of the stationary contact (4) away from the moving contact (21).
5. The contact arc extinguishing system according to claim 1, characterized in that: The arc extinguishing chamber (6) comprises two arc extinguishing plates (62) arranged at intervals, the plurality of arc extinguishing grids (61) are vertically arranged between the two arc extinguishing plates (62), and the plurality of arc extinguishing grids (61) are arranged in parallel and at intervals.
6. The contact arc extinguishing system according to claim 1, characterized in that: An air outlet channel is provided in the shell, the air outlet (80) and the arc extinguishing chamber are arranged on both sides of the air outlet channel, and a diversion portion (81) for diverting gas discharged from the arc extinguishing chamber is provided in the air outlet channel.
7. The contact arc extinguishing system according to claim 6, characterized in that: The flow splitter (81) is a cylindrical structure arranged between the top wall and the bottom wall of the gas outlet channel, and is spaced apart from the side wall of the gas outlet channel to form a branch (812). The cylindrical structure is provided with a flow splitter protrusion (811) protruding toward the arc extinguishing chamber on a side close to the arc extinguishing chamber.
8. The contact arc extinguishing system according to claim 1, characterized in that: The arc extinguishing chamber comprises a plurality of arc extinguishing grids (7).
9. The contact arc extinguishing system according to claim 1, characterized in that: The guide channel (50) becomes wider from bottom to top.
10. The contact arc extinguishing system according to claim 1 or 9, characterized in that: It also includes a guide plate (5), one end of which is connected to, in contact with, or spaced from the bottom of the arc extinguishing chamber (6), and the other end of which is in contact with or spaced from the bottom surface of the arc extinguishing chamber, and is opposite to and spaced from the lower area of the gas outlet side of the arc extinguishing chamber (6) close to the bottom to form the guide channel (50).
11. The contact arc extinguishing system according to claim 10, characterized in that: The guide plate (5) comprises a guide plate vertical section (52), a guide plate arc section (53) and a guide plate inclined section (54) which are connected in sequence; the bottom end of the guide plate vertical section (52) is connected to the guide plate mounting portion (51) and is arranged in close contact with or spaced from the gas outlet side of the arc extinguishing chamber (6); the notch of the guide plate arc section (53) is arranged away from the arc extinguishing chamber (6); the top end of the guide plate inclined section (54) is in contact with or spaced from the bottom surface of the arc extinguishing chamber and is inclined in a direction away from the arc extinguishing chamber (6).
12. The contact arc extinguishing system according to claim 10, characterized in that: The guide plate mounting portion (51) at one end of the guide plate (5) is mounted on the static contact (4), the arc extinguishing chamber (6) is mounted on the guide plate mounting portion (51), and the bottom surface of the arc extinguishing chamber (6) is fitted and connected to the guide plate mounting portion (51).
13. A circuit breaker, characterized in that: It comprises the contact arc extinguishing system as described in any one of claims 1-12.