Arc extinguishing device of high-voltage power circuit breaker

Abstract

The invention discloses an arc extinguishing device of a high-voltage power circuit breaker, relates to the field of arc extinguishing devices of high-voltage power circuit breakers, and solves the problems that when an arc extinguishing device of an existing high-voltage power circuit breaker is used, the position of an arc extinguishing grid piece is fixed, an arc input end is eroded, and the use efficiency and the service life are seriously influenced. Comprising a shell, an arc extinguishing mechanism, a switching mechanism and an alarm mechanism, the arc extinguishing mechanism comprises a device box, a first arc extinguishing grid piece and a second arc extinguishing grid piece, arc extinguishing operation is carried out on electric arcs through the first arc extinguishing grid piece and the second arc extinguishing grid piece in the arc extinguishing mechanism, the positions of the first arc extinguishing grid piece and the second arc extinguishing grid piece are switched through the switching mechanism, and the alarm mechanism is arranged in the shell. The upper sides and the lower sides of the first arc-extinguishing grid plate and the second arc-extinguishing grid plate can be uniformly switched for use, the service life of equipment is prolonged while the arc-extinguishing efficiency is improved, and the operation states of the first arc-extinguishing grid plate and the second arc-extinguishing grid plate are monitored and alarmed through the alarm mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of arc extinguishing devices for high-voltage power circuit breakers, and in particular to an arc extinguishing device for high-voltage power circuit breakers. Background Art

[0002] In the power system, the circuit breaker is an important switching device used to connect and disconnect the circuit under normal and fault conditions. When the circuit breaker breaks the current, an arc will be generated between the contacts. The high temperature and energy of the arc will cause serious damage to the contacts and surrounding equipment, reduce the service life and reliability of the circuit breaker, and even cause safety accidents.

[0003] The most common arc extinguishing device in circuit breakers is the arc extinguishing grid, but the existing arc extinguishing grid has a fixed structure and is prone to damage after long-term use, which affects the arc extinguishing efficiency. For example, when the circuit is disconnected, the arc will generate high temperature and strong electric field in the arc extinguishing grid, causing the metal material of the arc extinguishing grid to gradually melt, evaporate and sputter, resulting in structural damage and performance degradation of the arc extinguishing grid; frequent operation of the circuit breaker may cause the arc extinguishing grid to be subjected to mechanical impact force, and long-term accumulation may cause the components of the arc extinguishing grid to loosen, deform or break; when an overload or short circuit fault occurs in the circuit, the arc energy increases, which will have a stronger erosion and destructive effect on the arc extinguishing grid, making it more susceptible to damage.

[0004] Since the existing arc extinguishing grid has a fixed structure, during the arc extinguishing operation, the arc will be input from one end of the arc extinguishing grid and gradually transferred to the other end to complete the arc extinguishing. During the transfer process, the arc intensity gradually weakens, and the energy and heat generated also gradually decrease. As a result, during the long-term use of the arc extinguishing grid, it is found that the side of the arc extinguishing grid close to the arc input end is more susceptible to erosion and melting, while the other end of the arc extinguishing grid is in the output area where the arc is weaker, and is relatively less damaged. At this time, if the arc extinguishing grid is directly replaced, the overall service life of the arc extinguishing grid will be relatively short, and the cost of use will also be increased. Summary of the invention

[0005] The object of the present invention is to provide an arc extinguishing device for a high-voltage power circuit breaker which is convenient for extending the overall service life of the arc extinguishing device and improving the operating efficiency, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an arc extinguishing device for a high-voltage power circuit breaker, comprising a shell, an arc extinguishing mechanism, a switching mechanism and an alarm mechanism, wherein the shell is provided with a control switch, the arc extinguishing mechanism comprises a device box installed inside the shell, a plurality of groups of first arc extinguishing grids and second arc extinguishing grids are arranged in the device box, the first arc extinguishing grids and the second arc extinguishing grids are alternately distributed at equal intervals, the arc extinguishing mechanism can perform arc extinguishing operation on the electric arc through the first arc extinguishing grids and the second arc extinguishing grids, the switching mechanism is installed on the device box, and is used to switch the positions of the first arc extinguishing grids and the second arc extinguishing grids, so that the upper and lower sides of the first arc extinguishing grids and the second arc extinguishing grids can be evenly switched for use, thereby improving the arc extinguishing efficiency and extending the service life of the equipment, and the alarm mechanism is installed on the shell, and is used to monitor and alarm the operating status of the first arc extinguishing grids and the second arc extinguishing grids, so as to extend the overall service life of the arc extinguishing device and improve the operating efficiency.

[0007] Preferably, the switching mechanism includes a first top rod and a second top rod slidably connected to the inner wall of the device box, the first top rod is fixedly connected to the upper ends of the sides of multiple groups of the first arc-extinguishing grids, and the second top rod is fixedly connected to the upper ends of the sides of multiple groups of the second arc-extinguishing grids. A first bottom rod and a second bottom rod are slidably connected in the device box along the vertical direction, the first bottom rod is fixedly connected to the lower ends of the sides of multiple groups of the first arc-extinguishing grids, and the second bottom rod is fixedly connected to the lower ends of the sides of multiple groups of the second arc-extinguishing grids. The first top rod and the second bottom rod are located on the same inner side edge of the device box, the second top rod and the first bottom rod are located on the same inner side edge of the device box, the first top rod is located above the second bottom rod, and the second top rod is located above the first bottom rod. A switching member for switching the position of the first arc-extinguishing grid and the second arc-extinguishing grid is provided on the device box, which is convenient for switching the positions of the first arc-extinguishing grid and the second arc-extinguishing grid, so that the upper and lower sides of the first arc-extinguishing grid and the second arc-extinguishing grid can be evenly switched for use, thereby improving arc extinguishing efficiency and extending the service life of the equipment.

[0008] Preferably, the switching member includes two groups of first gears rotatably connected to the inner wall of the device box, two groups of sliding frames are slidably connected in the device box, two ends of one group of sliding frames are respectively fixedly connected to the first top rod and the first bottom rod, and two ends of the other group of sliding frames are respectively fixedly connected to the second top rod and the second bottom rod, two groups of first racks and second racks are provided in the device box, any group of the first gears can be meshed with a group of the first rack and the second rack, two groups of the second racks are respectively fixedly connected to the sliding frames on both sides, two groups of the first racks are respectively fixedly connected to the outermost group of the first arc-extinguishing grid and the second arc-extinguishing grid, and a rotating member for driving the first gear and the device box to rotate is provided in the shell to facilitate switching the positions of the first arc-extinguishing grid and the second arc-extinguishing grid.

[0009] Preferably, the arc extinguishing mechanism also includes an arc extinguishing hood fixedly installed inside the shell, and a moving contact and a static contact are provided inside the shell, and the moving contact and the static contact are respectively located below the arc extinguishing hood, and side plates are respectively fixedly connected on both sides of the arc extinguishing hood to facilitate arc extinguishing operation of the arc through the first arc extinguishing grid and the second arc extinguishing grid.

[0010] Preferably, the rotating member includes a first rotating shaft coaxially fixedly installed on the first gear on one side, the second gear is coaxially fixedly connected to the first rotating shaft, side holes are respectively opened on both sides of the arc extinguishing cover, two groups of fixing frames are fixedly connected in the shell, the first bevel gear is rotatably connected to the fixing frame, and the third gear and the fourth gear are respectively coaxially fixedly connected to the two groups of the first bevel gears, the third gear and the fourth gear can both engage with the second gear, and a driving member for driving the first bevel gear to rotate is provided in the shell to facilitate driving the first gear to rotate.

[0011] Preferably, the driving member includes a first driving shaft rotatably connected to the inner wall of the shell, two groups of first worm gears are coaxially fixedly connected to the first driving shaft, a second rotating shaft is rotatably connected to the fixed frame, the top end of the second rotating shaft is coaxially fixedly connected to a first worm wheel meshing with the first worm gear, and the bottom of the second rotating shaft is coaxially fixedly connected to a second bevel gear meshing with the first bevel gear, so as to drive the first bevel gear to rotate.

[0012] Preferably, the rotating member also includes rotating blocks fixedly installed on both sides of the device box, the rotating blocks are rotatably connected to the side plates, a group of the rotating blocks are coaxially fixedly connected with a second worm gear, the shell is rotatably connected with a second drive shaft, the second drive shaft is coaxially fixedly connected with a second worm, the second worm is meshed with the second worm gear, so as to facilitate the adjustment of the overall direction of the device box, thereby switching the position orientation of the upper and lower sides of the first arc extinguishing grid and the second arc extinguishing grid themselves.

[0013] Preferably, the alarm mechanism includes a temperature sensor fixedly mounted on the second gear, and an alarm is fixedly connected to the outer wall of the shell for sensing the temperature value of the temperature sensor and issuing an alarm, so as to facilitate monitoring and alarming of the operating status of the first arc-extinguishing grid and the second arc-extinguishing grid.

[0014] Preferably, one end of the first driving shaft and the second driving shaft are respectively fixedly connected with an insulating knob to facilitate rotation adjustment operation.

[0015] Preferably, the first arc-extinguishing grid and the second arc-extinguishing grid are both made of copper-plated steel sheets, so as to improve the overall corrosion resistance of the arc-extinguishing grid and extend the service life.

[0016] Compared with the prior art, the present invention has the following beneficial effects: An arc extinguishing device for a high-voltage power circuit breaker provided by the present invention solves the problem that the position of the arc extinguishing grid is fixed when the existing high-voltage power circuit breaker is used, and erosion at the arc input end seriously affects the use efficiency and service life. The arc is extinguished by the first arc extinguishing grid and the second arc extinguishing grid in the arc extinguishing mechanism, and the positions of the first arc extinguishing grid and the second arc extinguishing grid are switched by a switching mechanism, so that the upper and lower sides of the first arc extinguishing grid and the second arc extinguishing grid can be switched and used evenly, thereby improving the arc extinguishing efficiency and extending the service life of the equipment. The operating status of the first arc extinguishing grid and the second arc extinguishing grid are monitored and alarmed by an alarm mechanism. The device has a compact overall structure and is easy to operate. It can make full use of the different positions of the arc extinguishing grids for switching and use, thereby extending the overall service life of the equipment, reducing the frequency of replacement, and being more convenient and efficient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the housing of the present invention; Figure 3 It is a schematic diagram of the local structure of the rotating part of the present invention; Figure 4 for Figure 3 A magnified image of area A; Figure 5It is a schematic diagram of the partial structure of the arc extinguishing mechanism of the present invention; Figure 6 It is a partial structural cross-sectional view of the switching mechanism of the present invention; Figure 7 It is a schematic diagram of the structure when the first arc-extinguishing grid of the present invention is located at the upper side; Figure 8 It is a schematic diagram of the structure of the first arc-extinguishing grid in the process of switching downwards according to the present invention; Fig. 9 It is an exploded view of the local structure of the switching mechanism of the present invention.

[0018] In the figure: 1-housing; 2-control switch; 3-arc extinguishing mechanism; 4-device box; 5-first arc extinguishing grid; 6-second arc extinguishing grid; 7-switching mechanism; 9-first top rod; 10-second top rod; 11-first bottom rod; 12-second bottom rod; 13-switching member; 14-first gear; 15-sliding frame; 16-first rack; 17-second rack; 18-rotating member; 19-arc extinguishing cover; 20-moving contact; 21-static contact; 22-side plate; 2 3-first rotating shaft; 24-second gear; 25-side hole; 26-fixed frame; 27-first bevel gear; 28-third gear; 29-fourth gear; 30-driving member; 31-first driving shaft; 32-first worm; 33-second rotating shaft; 34-first worm wheel; 35-second bevel gear; 36-rotating block; 37-second worm wheel; 38-second driving shaft; 39-second worm; 40-temperature sensor; 41-alarm; 42-insulating knob. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0020] See also Figure 1-Figure 9The present invention provides a technical solution: an arc extinguishing device for a high-voltage power circuit breaker, comprising a housing 1, an arc extinguishing mechanism 3, a switching mechanism 7 and an alarm mechanism, wherein the housing 1 is provided with a control switch 2, the arc extinguishing mechanism 3 comprises a device box 4 installed inside the housing 1, wherein a plurality of first arc extinguishing grids 5 and second arc extinguishing grids 6 are arranged in the device box 4, wherein the first arc extinguishing grids 5 and the second arc extinguishing grids 6 are both made of copper-plated steel sheets, wherein the first arc extinguishing grids 5 and the second arc extinguishing grids 6 are alternately distributed at equal intervals, wherein the arc extinguishing mechanism 3 can extinguish an arc through the first arc extinguishing grids 5 and the second arc extinguishing grids 6, wherein the switching mechanism 7 is installed on the device box 4, and is used to switch the positions of the first arc extinguishing grids 5 and the second arc extinguishing grids 6, so that the upper and lower sides of the first arc extinguishing grids 5 and the second arc extinguishing grids 6 can be evenly switched for use, thereby improving the arc extinguishing efficiency and prolonging the service life of the equipment, and wherein the alarm mechanism is installed on the housing 1, and is used to monitor and alarm the operating status of the first arc extinguishing grids 5 and the second arc extinguishing grids 6.

[0021] The switching mechanism 7 includes a first top rod 9 and a second top rod 10 which are slidably connected to the inner wall of the device box 4, the first top rod 9 is fixedly connected to the upper ends of the sides of multiple groups of first arc-extinguishing grids 5, the second top rod 10 is fixedly connected to the upper ends of the sides of multiple groups of second arc-extinguishing grids 6, a first bottom rod 11 and a second bottom rod 12 are slidably connected in the device box 4 along the vertical direction, the first bottom rod 11 is fixedly connected to the lower ends of the sides of multiple groups of first arc-extinguishing grids 5, the second bottom rod 12 is fixedly connected to the lower ends of the sides of multiple groups of second arc-extinguishing grids 6, the first top rod 9 and the second bottom rod 12 are located on the same inner side edge of the device box 4, the second top rod 10 and the first bottom rod 11 are located on the same inner side edge of the device box 4, the first top rod 9 is located above the second bottom rod 12, the second top rod 10 is located above the first bottom rod 11, and a switching member 13 for switching the positions of the first arc-extinguishing grid 5 and the second arc-extinguishing grid 6 is provided on the device box 4.

[0022] The switching member 13 includes two groups of first gears 14 rotatably connected to the inner wall of the device box 4, two groups of sliding frames 15 are slidably connected in the device box 4, two ends of one group of sliding frames 15 are respectively fixedly connected to the first top rod 9 and the first bottom rod 11, and two ends of the other group of sliding frames 15 are respectively fixedly connected to the second top rod 10 and the second bottom rod 12, two groups of first racks 16 and second racks 17 are provided in the device box 4, any group of first gears 14 can be respectively engaged with a group of first racks 16 and second racks 17, the two groups of second racks 17 are respectively fixedly connected to the sliding frames 15 on both sides, the two groups of first racks 16 are respectively fixedly connected to the outermost group of first arc-extinguishing grids 5 and second arc-extinguishing grids 6, and a rotating member 18 for driving the first gear 14 and the device box 4 to rotate is provided in the housing 1.

[0023] The arc extinguishing mechanism 3 also includes an arc extinguishing hood 19 fixedly installed inside the shell 1. A moving contact 20 and a static contact 21 are provided inside the shell 1. The moving contact 20 and the static contact 21 are respectively located below the arc extinguishing hood 19. Side plates 22 are fixedly connected to both sides of the arc extinguishing hood 19.

[0024] The rotating member 18 includes a first rotating shaft 23 coaxially fixedly installed on the first gear 14 on one side, a second gear 24 is coaxially fixedly connected to the first rotating shaft 23, side holes 25 are respectively opened on both sides of the arc extinguishing cover 19, two groups of fixing frames 26 are fixedly connected in the shell 1, a first bevel gear 27 is rotatably connected to the fixing frame 26, a third gear 28 and a fourth gear 29 are coaxially fixedly connected to the two groups of first bevel gears 27, the third gear 28 and the fourth gear 29 can both mesh with the second gear 24, and a driving member 30 for driving the first bevel gear 27 to rotate is provided in the shell 1.

[0025] The driving member 30 includes a first driving shaft 31 rotatably connected to the inner wall of the shell 1, two sets of first worm gears 32 are coaxially fixedly connected to the first driving shaft 31, a second rotating shaft 33 is rotatably connected to the fixed frame 26, the top end of the second rotating shaft 33 is coaxially fixedly connected to a first worm wheel 34 meshing with the first worm gear 32, and the bottom of the second rotating shaft 33 is coaxially fixedly connected to a second bevel gear 35 meshing with the first bevel gear 27.

[0026] The rotating member 18 also includes a rotating block 36 fixedly installed on both sides of the device box 4, the rotating block 36 is rotatably connected to the side plate 22, a group of rotating blocks 36 are coaxially fixedly connected to a second worm gear 37, a second drive shaft 38 is rotatably connected to the shell 1, one end of the first drive shaft 31 and the second drive shaft 38 are respectively fixedly connected to an insulating knob 42, a second worm 39 is coaxially fixedly connected to the second drive shaft 38, and the second worm 39 is meshed with the second worm gear 37.

[0027] The alarm mechanism includes a temperature sensor 40 fixedly mounted on the second gear 24 , and an alarm 41 for sensing the temperature value of the temperature sensor 40 and issuing an alarm is fixedly connected to the outer wall of the housing 1 .

[0028] In this embodiment, in the initial state, the first arc extinguishing grid 5 is located above the second arc extinguishing grid 6, and the arc generated between the moving contact 20 and the static contact 21 will be dispersed and input into the device box 4 through the area between the relatively close second arc extinguishing grids 6. As the transmission of the arc gradually weakens, when it reaches the junction of the first arc extinguishing grid 5 and the second arc extinguishing grid 6, the number of arc extinguishing grids increases to further cut off the arc. At this time, the amount of arc has been greatly weakened, and the arc continues to be transported upward to the upper first arc extinguishing grids 5 and then gradually disappears, and is completely extinguished when it reaches the top arc extinguishing cover 19.

[0029] When the arc intensity is large, the temperature of the second arc-extinguishing grid 6 below continues to increase or the arc-extinguishing effect of the second arc-extinguishing grid 6 below weakens, the temperature in the device box 4 increases sharply and the heat dissipation speed slows down. At this time, the temperature can be transmitted to the temperature sensor 40. The temperature change trend is sensed by the temperature sensor 40. When the maximum temperature is greater than the set value for a long time or the temperature is continuously greater than the set value and cannot be cooled down, it means that the arc-extinguishing efficiency is weakened and the second arc-extinguishing grid 6 below may be damaged. The alarm 41 sounds an alarm to remind people to switch operations.

[0030] When switching, the first driving shaft 31 can be rotated, so that the first worm 32 drives the first worm wheel 34 to rotate, so that the second rotating shaft 33 drives the second bevel gear 35 to rotate the first bevel gear 27, and the first bevel gear 27 drives the third gear 28 and the fourth gear 29 to rotate. At this time, the meshing second gear 24 can be rotated, and the second gear 24 drives the first rotating shaft 23 to rotate the first gear 14, and the first gear 14 drives the adjacent first rack 16 and the second rack 17 to slide, thereby driving The second arc-extinguishing grid 6 below is moved vertically upward, and the first arc-extinguishing grid 5 is moved vertically downward until the first bottom rod 11 moves up to conflict with the bottom surface of the second top rod 10. At this time, the position switching is completed, and the first arc-extinguishing grid 5 can be switched to the bottom of the second arc-extinguishing grid 6. When it is necessary to switch again, the first driving shaft 31 is rotated in the opposite direction to switch in the opposite direction until the bottom surface of the first top rod 9 slides down to conflict with the top surface of the second bottom rod 12, so that the first arc-extinguishing grid 5 moves above the second arc-extinguishing grid 6 again.

[0031] Since in the above switching process, only the relative position between the first arc-extinguishing grid 5 and the second arc-extinguishing grid 6 is switched, and the lengths of the first arc-extinguishing grid 5 and the second arc-extinguishing grid 6 are relatively long, the erosion degree of the bottom of the first arc-extinguishing grid 5 is much greater than the erosion degree of the upper end. The upper side position with a relatively small erosion degree cannot be fully utilized only by the above adjustment. Therefore, the second drive shaft 38 is required. When the second drive shaft 38 rotates, it can drive the second worm 39 so that the second worm gear 37 drives the rotating block 36 and the device box 4 to rotate as a whole, thereby switching the upper and lower sides of the first arc-extinguishing grid 5 and the second arc-extinguishing grid 6. The switching process The middle device box 4 will drive the first rotating shaft 23 and the second gear 24 to shuttle as a whole inside the side hole 25, and the second gear 24 swings 180°, so that the second gear 24 can switch and mesh with the third gear 28 and the fourth gear 29. Since the rotation of the third gear 28 and the fourth gear 29 is synchronously driven by the first driving shaft 31, the number of teeth of the second gear 24 is set to a symmetrical value, so that during the adjustment process, the second gear 24 originally meshed with the third gear 28 can be rotated 180° and just meshed with the fourth gear 29 on the opposite side, and vice versa. This swing switching meshing method will not cause the teeth to get stuck, and the meshing is more stable and efficient.

[0032] It is worth noting that: the first drive shaft 31 and the second drive shaft 38 are driven and switched by the worm driving the worm wheel to rotate, so that automatic limiting can be achieved during the switching process to avoid the shaking of the device box 4 and the unstable position. The overall structure of the equipment is compact and easy to operate. It can make full use of the different positions of the arc extinguishing grid for switching, thereby extending the overall service life of the equipment, reducing the frequency of replacement, and making it more convenient and efficient to use.

[0033] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An arc extinguishing device for a high voltage power circuit breaker, characterized in that: include: A housing (1), wherein a control switch (2) is provided on the housing (1); Also includes: An arc extinguishing mechanism (3), the arc extinguishing mechanism (3) comprising a device box (4) installed inside the housing (1), a plurality of groups of first arc extinguishing grids (5) and second arc extinguishing grids (6) being arranged inside the device box (4), the first arc extinguishing grids (5) and the second arc extinguishing grids (6) being alternately distributed at equal intervals, and the arc extinguishing mechanism (3) can perform an arc extinguishing operation on an electric arc through the first arc extinguishing grids (5) and the second arc extinguishing grids (6); A switching mechanism (7), the switching mechanism (7) being mounted on the device box (4) and used for switching the positions of the first arc-extinguishing grid (5) and the second arc-extinguishing grid (6), so that the upper and lower sides of the first arc-extinguishing grid (5) and the second arc-extinguishing grid (6) can be switched evenly for use, thereby improving arc extinguishing efficiency and extending the service life of the equipment; An alarm mechanism is installed on the housing (1) and is used to monitor and alarm the operating status of the first arc-extinguishing grid (5) and the second arc-extinguishing grid (6).

2. The arc extinguishing device of a high voltage power circuit breaker according to claim 1, characterized in that: The switching mechanism (7) comprises a first top rod (9) and a second top rod (10) which are slidably connected to the inner wall of the device box (4); the first top rod (9) is fixedly connected to the upper ends of the side surfaces of the plurality of groups of the first arc-extinguishing grids (5); the second top rod (10) is fixedly connected to the upper ends of the side surfaces of the plurality of groups of the second arc-extinguishing grids (6); a first bottom rod (11) and a second bottom rod (12) are slidably connected in the device box (4) along a vertical direction; the first bottom rod (11) is fixedly connected to the lower ends of the side surfaces of the plurality of groups of the first arc-extinguishing grids (5); the second bottom rod (12) is fixedly connected to the lower ends of the side surfaces of the plurality of groups of the second arc-extinguishing grids (6); and a switching member (13) for switching the positions of the first arc-extinguishing grids (5) and the second arc-extinguishing grids (6) is provided on the device box (4).

3. The arc extinguishing device of a high voltage power circuit breaker according to claim 2, characterized in that: The switching member (13) comprises two groups of first gears (14) rotatably connected to the inner wall of the device box (4); two groups of sliding frames (15) are slidably connected inside the device box (4); two ends of one group of sliding frames (15) are respectively fixedly connected to the first top rod (9) and the first bottom rod (11); two ends of the other group of sliding frames (15) are respectively fixedly connected to the second top rod (10) and the second bottom rod (12); and two groups of first racks (16) and second racks (17) are provided inside the device box (4). 17), any group of the first gears (14) can mesh with a group of the first racks (16) and the second racks (17), two groups of the second racks (17) are respectively fixedly connected to the sliding frames (15) on both sides, two groups of the first racks (16) are respectively fixedly connected to the outermost group of the first arc-extinguishing grid (5) and the second arc-extinguishing grid (6), and a rotating member (18) for driving the first gears (14) and the device box (4) to rotate is provided in the housing (1).

4. The arc extinguishing device of a high-voltage power circuit breaker according to claim 3, characterized in that: The arc extinguishing mechanism (3) further comprises an arc extinguishing hood (19) fixedly mounted inside the housing (1); a moving contact (20) and a stationary contact (21) are provided inside the housing (1); the moving contact (20) and the stationary contact (21) are respectively located below the arc extinguishing hood (19); and side plates (22) are respectively fixedly connected to both sides of the arc extinguishing hood (19).

5. The arc extinguishing device of a high voltage power circuit breaker according to claim 4, characterized in that: The rotating member (18) comprises a first rotating shaft (23) coaxially fixedly mounted on one side of the first gear (14); a second gear (24) is coaxially fixedly connected to the first rotating shaft (23); side holes (25) are respectively provided on both sides of the arc extinguishing cover (19); two groups of fixing frames (26) are fixedly connected in the housing (1); a first bevel gear (27) is rotatably connected to the fixing frames (26); a third gear (28) and a fourth gear (29) are respectively coaxially fixedly connected to the two groups of the first bevel gears (27); the third gear (28) and the fourth gear (29) are both capable of meshing with the second gear (24); and a driving member (30) for driving the first bevel gear (27) to rotate is provided in the housing (1).

6. The arc extinguishing device of a high voltage power circuit breaker according to claim 5, characterized in that: The driving member (30) comprises a first driving shaft (31) rotatably connected to the inner wall of the housing (1); two sets of first worm gears (32) are coaxially fixedly connected to the first driving shaft (31); a second rotating shaft (33) is rotatably connected to the fixing frame (26); a first worm gear (34) meshing with the first worm gear (32) is coaxially fixedly connected to the top end of the second rotating shaft (33); and a second bevel gear (35) meshing with the first bevel gear (27) is coaxially fixedly connected to the bottom end of the second rotating shaft (33).

7. The arc extinguishing device of a high voltage power circuit breaker according to claim 6, characterized in that: The rotating member (18) further comprises rotating blocks (36) fixedly mounted on both sides of the device box (4), the rotating blocks (36) being rotatably connected to the side plates (22), a group of the rotating blocks (36) being coaxially fixedly connected to a second worm gear (37), the housing (1) being rotatably connected to a second drive shaft (38), the second drive shaft (38) being coaxially fixedly connected to a second worm gear (39), the second worm gear (39) being meshed with the second worm gear (37).

8. The arc extinguishing device of a high voltage power circuit breaker according to claim 5, characterized in that: The alarm mechanism comprises a temperature sensor (40) fixedly mounted on the second gear (24), and an alarm (41) for sensing a temperature value of the temperature sensor (40) and issuing an alarm is fixedly connected to the outer wall of the housing (1).

9. The arc extinguishing device of a high voltage power circuit breaker according to claim 7, characterized in that: One end of the first drive shaft (31) and one end of the second drive shaft (38) are respectively fixedly connected to an insulating knob (42).

10. The arc extinguishing device of a high voltage power circuit breaker according to claim 1, characterized in that: The first arc-extinguishing grid (5) and the second arc-extinguishing grid (6) are both made of copper-plated steel sheets.

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