Alternating current and direct current dual power supply switching device

Abstract

The invention relates to the field of alternating-current and direct-current switching, and discloses an alternating-current and direct-current dual-power switching device which comprises an alternating-current power source and a direct-current power source, the alternating-current power source comprises a motor and a generator which are connected through a connecting module, an energy storage flywheel is arranged on an output shaft of the generator, and a brake is arranged on a mounting frame. The motor drives the generator to operate through the connecting module, alternating current generated by the generator supplies power to subway equipment, when the alternating current power supply normally interrupts power supply, the brake brakes the energy storage flywheel at the same time, the direct current power supply comprises a storage battery, and the alternating current power supply and the direct current power supply are connected in parallel. The switch module comprises a first switch and a second switch which are connected in series on the two parallel branches respectively, when the alternating current power supply is abnormally powered off, the brake is not started, and the connecting module is driven by the rotating speed difference between the motor and the generator and is matched with the switch module, so that automatic electrified switching between the alternating current power supply and the direct current power supply is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of AC / DC power switching, and in particular to an AC / DC dual power switching device. Background Art

[0002] In the subway power supply system, the AC / DC power supply device is an important device to ensure the normal operation of the substation equipment, which is of great significance to the normal operation of the subway system. The subway AC / DC power supply device includes an AC distribution power supply and a DC operating power supply. The former directly provides AC power to the equipment, and the latter uses a battery as a backup power supply. The DC power is converted into AC power through existing technologies such as inverters to power the equipment. When the AC power fails, it can supply power and ensure the work after the power failure. In the prior art, the switching between the AC power supply and the DC power supply is generally a power-off switching, that is, after the AC power fails, the staff manually or the control system automatically drives the switch to switch, so that the DC power supply is powered. During this period, the equipment will have a short pause, and the stopping and starting of the equipment will have an obvious feature, which is easy to be perceived by passengers on the subway and easily cause panic among passengers. Therefore, as a public transportation equipment, it is necessary to improve the AC / DC power supply device to realize automatic triggering and live switching. The switching process is smooth and not easy to be perceived by passengers. Based on this, the present invention proposes an AC / DC dual power switching device. Summary of the invention

[0003] In order to solve the problems mentioned in the above background, the present invention provides an AC / DC dual power switching device.

[0004] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows.

[0005] An AC / DC dual power switching device comprises an AC power supply, a DC power supply and a mounting frame, on which a connection module and a switch module are mounted;

[0006] The AC power supply includes an electric motor and a generator, and the two are connected through a connection module. An energy storage flywheel is arranged on the output shaft of the generator, and a brake is arranged on the mounting frame. In normal use, the electric motor drives the generator to operate through the connection module, and the AC power generated by the generator supplies power to the subway equipment. When the AC power supply is normally interrupted, the brake stops the energy storage flywheel at the same time;

[0007] The DC power supply includes a battery, the AC power supply and the DC power supply are connected in parallel, and the switch module includes a switch 1 and a switch 2 which are respectively arranged in series on two parallel branches. When the AC power supply is abnormally cut off, the brake is not activated, and the connection module is driven by the speed difference between the motor and the generator, and cooperates with the switch module to realize automatic energized switching between the AC power supply and the DC power supply.

[0008] As a further improvement and optimization of the present invention, the switch module includes a side touch rod slidably mounted on the mounting frame, an external step is arranged on the outside of the side touch rod, two side touch rods are arranged and are respectively side touch rod 1 and side touch rod 2, the outer sleeve of the side touch rod 1 is provided with a spring 1 located between the external step and the mounting frame, the outer sleeve of the side touch rod 2 is provided with a spring 2 located between the external step and the mounting frame, the spring 1 is insulated from the spring 2 and the elastic force of both is used to drive the corresponding side touch rod to approach the other side touch rod;

[0009] A middle bracket is arranged between the two side touch rods, and a left touch rod and a right touch rod are arranged on both sides of the middle bracket respectively. The left touch rod can contact with the side touch rod 1 and the two constitute the switch 1 corresponding to the AC power supply, and the right touch rod can contact with the side touch rod 2 and the two constitute the switch 2 corresponding to the DC power supply.

[0010] As a further improvement and optimization of the present invention, when the middle bracket is located at the middle position between the two side contact rods, both switch 1 and switch 2 are closed.

[0011] As a further improvement and optimization of the present invention, the connection module includes a first connecting shaft and a second connecting shaft which are mounted on the mounting frame through a bearing and are parallel to the sliding direction of the side touch rod, and the two connecting shafts are coaxial;

[0012] The input end of the first connecting shaft is connected with the motor, and the output end is coaxially installed with a cover shell. The input end of the second connecting shaft coaxially extends into the cover shell and is installed with a rotating disk, and the output end is connected with the generator.

[0013] As a further improvement and optimization of the present invention, the cover shell is in the shape of a cylindrical shell with one end open and provided with a shell cover and the other end closed, and the shell cover is connected to the connecting shaft.

[0014] As a further improvement and optimization of the present invention, a sliding hole is radially opened on the outer circumferential surface of the cover shell, a sliding rod is slidably installed in the sliding hole, the outer circumferential surface of the rotating disk is provided with a protrusion and a groove and an arc surface located therebetween, the rotation direction when the motor drives the cover shell to rotate is rotation direction one, the protrusion is located in front of the groove along rotation direction one, and initially, the sliding rod is located between the protrusion and the groove, and the sliding rod is in contact with the protrusion.

[0015] As a further improvement and optimization of the present invention, a roller is installed at the end of the slide rod facing the axis of the cover shell, and the roller is in contact with the arc surface.

[0016] As a further improvement and optimization of the present invention, a guide rod extends from the closed end of the cover shell, a push frame is slidably connected to the guide rod, a limit ring is arranged at the end of the guide rod, and a spring 3 is arranged between the limit ring and the push frame on the outer sleeve of the guide rod;

[0017] The push frame is provided with inclined plane 1, and the end of the slide rod away from the axis line of the cover shell is provided with inclined plane 2, and inclined plane 1 is in contact with inclined plane 2. When the slide rod moves away from the axis line of the cover shell, the push frame can be pushed to move away from the connecting shaft 1 through the cooperation of inclined plane 1 and inclined plane 2. The push frame is connected to the middle bracket, and switch 1 is located on the side of the middle bracket facing the connecting shaft 1.

[0018] As a further improvement and optimization of the present invention, the connection between the groove and the arc surface is rounded.

[0019] Working process of the present invention:

[0020] In normal use, the switch corresponding to the AC power supply is closed, and the switch corresponding to the DC current is opened. Therefore, the AC power provided by the AC power supply can be delivered to the subway equipment. The power supply process of the AC power supply is as follows: At the beginning, Figure 7 Taking the perspective in as an example, the operation of the motor drives the first connecting shaft to rotate, and the first connecting shaft rotates with the cover, and the rotation of the cover is clockwise. Therefore, when the cover rotates, the sliding rod pushes the protrusion to rotate with the rotating disk, and the rotating disk rotates with the second connecting shaft, thereby driving the generator to operate and generate electricity, and the generated electricity is sent to the subway equipment;

[0021] When the subway equipment is normally suspended and the power supply needs to be temporarily interrupted, the motor is paused. At the same time, the brake is used to stop the energy storage flywheel from rotating, that is, the motor and generator are paused at the same time, and the power supply is suspended.

[0022] When there is a problem with the AC power, the motor stops rotating, and the output shaft of the generator continues to rotate driven by the energy storage flywheel. Therefore, there will be a speed difference between the first and second coupling shafts. Figure 7 For example, the rotating disk rotates clockwise while the cover does not move. At this time, the arc surface of the rotating disk can drive the slide bar to move away from the axis of the cover. When the slide bar moves, the push frame is driven to move through the inclined planes 1 and 2. The push frame moves with the middle bracket, so that the switch module goes through stages 1, 2, and 3 in sequence:

[0023] In the first stage, switch 1 is closed and switch 2 is open. Due to the existence of the energy storage flywheel, the generator can still generate electricity to provide power to the subway equipment.

[0024] In the second stage, the movement of the middle bracket closes switches 1 and 2. At this time, the generator and the DC current battery supply power to the subway equipment;

[0025] In the third stage, the movement of the middle bracket causes switch one to be disconnected and switch two to be closed. At this time, the generator stops rotating and stops supplying power, and is switched to battery power. At this point, the AC power supply and DC power supply are switched, and the switching is automatic with power on. When the switching is completed, the roller on the slide bar is located in the groove, forming a plug-in, which will limit the rotation of the rotating disk, that is, limit the operation of the generator. At the same time, since the elastic force of spring three will eventually give the slide bar a movement trend radially close to the axis of the cover, spring three remains compressed at this time and cannot release the elastic force;

[0026] When the AC power problem is solved, the motor starts, and the cover first rotates with the slide bar. The rounded corners between the groove and the arc surface can make the slide bar leave the groove and re-contact the protrusion. During this process, spring three will release the elastic force, causing the switch module to perform the reverse action of stages one, two, and three mentioned above, thereby realizing the switching from linear power to AC power, and the generator runs to provide power to the subway equipment.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] This solution can realize the smooth and smooth live switching between AC power supply and DC power supply. On this basis: on the one hand, during normal use, the power supply and power failure of the AC power supply corresponding to the start and stop of the subway equipment are not affected, that is, the normal use of the AC power is not affected; on the other hand, when there is a problem with the AC power, the AC power can be automatically switched to the backup DC power supply. During the switching transition, the subway equipment can still operate normally. Therefore, the subway equipment has no obvious corresponding characteristics and is not easily perceived by passengers. As a public transportation equipment, it is not easy to cause panic among passengers;

[0029] When the AC power problem is repaired and solved, AC power is directly supplied, and the DC power supply can be automatically switched to AC power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the present invention;

[0031] Figure 2 It is a schematic diagram of the mounting frame, the connection module and the switch module;

[0032] Figure 3 This is a top view of the connection module and the switch module in stage 1;

[0033] Figure 4 In stage 2, a top view of the connection module and the switch module;

[0034] Figure 5 The top view of the connection module and the switch module in stage three;

[0035] Figure 6A schematic diagram of connecting the module and the switch module;

[0036] Figure 7 A partial diagram of the connection module Figure 1 ;

[0037] Figure 8 A partial diagram of the connection module Figure 2 ;

[0038] Fig. 9 A partial diagram of the connection module Figure 3 ;

[0039] Fig.10 It is a side view of the rotating disk, sliding rod and push rack.

[0040] The reference numerals in the accompanying drawings are:

[0041] 100, motor; 101, generator; 102, energy storage flywheel; 103, brake; 104, battery; 105, voltage stabilizer; 106, inverter; 107, control system; 200, connection module; 201, coupling shaft one; 202, coupling shaft two; 203, cover; 204, shell cover; 205, rotating disk; 2051, protrusion; 2052, groove; 206, slide bar; 207, push frame; 208, spring three; 300, switch module; 301, middle bracket; 302, left touch bar; 303, right touch bar; 304, side touch bar one; 305, spring one; 306, side touch bar two; 307, spring two. DETAILED DESCRIPTION

[0042] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0043] Reference Figure 1-Figure 10 , an AC / DC dual power switching device, including an AC power supply and a DC power supply.

[0044] The AC power supply includes an electric motor 100 and a generator 101, which are connected via a connecting module 200. In addition, an energy storage flywheel 102 is provided on the output shaft of the generator 101. During normal use, the electric motor 100 drives the generator 101 to operate via the connecting module 200. The electricity generated by the generator 101 is used as an AC power supply to supply power to the subway equipment. Furthermore, the electricity output by the generator 101 is stabilized by a voltage stabilizer 105 and then sent to the subway equipment via a control system 107. Both the voltage stabilizer 105 and the control system 107 can be realized by existing technologies and will not be described in detail.

[0045] The DC power supply includes a battery 104 . The DC power provided by the battery 104 can be converted by an inverter 106 and can also be sent to the subway equipment via a control system 107 .

[0046] The AC power supply and the DC power supply are in parallel, and the switch module 300 for switching between the two includes a switch 1 and a switch 2 which are respectively arranged in series on two parallel branches. In addition, the inverter 106 is arranged on the parallel branch where the DC power supply is located, the voltage stabilizer 105 is arranged on the parallel branch where the AC power supply is located, and the control system 107 is arranged on the parallel main line.

[0047] Switch module 300:

[0048] Reference Figure 2-Figure 5 The present solution also includes a mounting frame for mounting the connection module 200 and the switch module 300 .

[0049] The switch module 300 includes a side touch rod slidably mounted on a mounting frame, an external step is arranged on the outside of the side touch rod, and a spring is sleeved on the outside of the side touch rod and is located between the external step and the mounting frame. Two side touch rods are arranged and are respectively side touch rod 1 304 and side touch rod 2 306. Spring 1 305 is arranged on side touch rod 1 304, and spring 2 307 is arranged on side touch rod 2 306. The elastic force of the spring is used to drive the two side touch rods to move closer to each other. In addition, the spring is made of insulating material or is provided with an insulating layer on the outside.

[0050] A middle bracket 301 is arranged between the two side touch rods, and a left touch rod 302 and a right touch rod 303 are arranged on both sides of the middle bracket 301 respectively. The left touch rod 302 can contact with the side touch rod 1 304, and the two constitute switch 1, corresponding to the AC power supply. The right touch rod 303 can contact with the side touch rod 2 306, and the two constitute switch 2, corresponding to the DC power supply.

[0051] In addition, it should be noted that when the middle bracket 301 is in the middle position between the two side touch rods, switch one and switch two are both closed, that is, the left touch rod 302 is in contact with the side touch rod one 304, and the right touch rod 303 is in contact with the side touch rod two 306. After that, whichever side the middle bracket 301 continues to move to, the switch on that side remains closed, the corresponding spring is compressed, and the switch on the other side is disconnected.

[0052] Reference Figure 1 A brake 103 is provided on the mounting frame for braking the energy storage flywheel 102 to stop it from rotating. This is an existing braking technology, and automobile braking technology can be used, which will not be described in detail.

[0053] During normal use, the middle bracket 301 is closer to the side contact rod 1 304, the switch 1 corresponding to the AC power source is closed, and the switch 2 corresponding to the DC current is disconnected, so that the AC power provided by the AC power source can be delivered to the subway equipment. When the subway equipment is normally suspended and needs to be temporarily interrupted, the motor 100 is suspended. At the same time, the energy storage flywheel 102 is stopped by the brake 103, that is, the motor 100 and the generator 101 are suspended at the same time, and the power supply is suspended;

[0054] When there is a problem with the AC power, the motor 100 stops rotating, and the output shaft of the generator 101 continues to rotate driven by the energy storage flywheel 102, that is, there is a speed difference between the motor 100 and the generator 101, and the speed difference drives the connection module 200 to switch states, and the connection module 200 drives the middle bracket 301 to move, and the movement is divided into three stages:

[0055] In the first stage, the switch 1 is closed and the switch 2 is opened. Due to the existence of the energy storage flywheel 102, the generator 101 can still generate electricity to provide power to the subway equipment.

[0056] In the second stage, the movement of the middle bracket 301 closes the switches 1 and 2. At this time, the generator 101 and the DC battery 104 supply power to the subway equipment.

[0057] In stage three, the movement of the middle bracket 301 causes switch one to open and switch two to close. At this time, the generator 101 stops rotating and stops supplying power, and the battery 104 supplies power instead. At this point, the AC power supply and DC power supply are switched, and the switching is live, smooth and stable.

[0058] Connecting module 200:

[0059] Reference Figure 6-Figure 10 The connection module 200 includes a connecting shaft 1 201 and a connecting shaft 202 which are mounted on the mounting frame through bearings and are parallel to the sliding direction of the side touch rod, and the two connecting shafts are coaxial.

[0060] The input end of the coupling 201 is connected to the motor 100 , and a cover 203 is coaxially installed on the output end. Furthermore, the cover 203 is in the shape of a cylindrical shell with one end open and the other end closed. A shell cover 204 is provided at the open end, and the shell cover 204 is connected to the coupling 201 .

[0061] The input end of the second coupling shaft 202 coaxially extends into the housing 203 and is provided with a rotating disk 205 , and the output end is connected to the generator 101 .

[0062] The outer circumferential surface of the cover 203 is provided with a sliding hole in the radial direction, and a sliding rod 206 is slidably installed in the sliding hole. The outer circumferential surface of the rotating disk 205 is provided with a protrusion 2051 and a groove 2052 and an arc surface located therebetween. When the motor 100 is running to drive the cover 203 to rotate, the rotation direction is rotation direction 1. The protrusion 2051 is located in front of the groove 2052 along the rotation direction 1. Initially, the sliding rod 206 is located between the protrusion 2051 and the groove 2052, and the sliding rod 206 is in contact with the protrusion 2051. Figure 7 Taking the perspective in as an example, the operation of the motor 100 drives the coupling shaft 201 to rotate, and the coupling shaft 201 rotates with the cover 203. The rotation direction of the cover 203 is clockwise, that is, the rotation direction 1 is clockwise. Therefore, when the cover 203 rotates, the protrusion 2051 is pushed by the sliding rod 206 to rotate with the rotating disk 205, and the rotating disk 205 rotates with the coupling shaft 202, thereby driving the generator 101 to operate and generate electricity.

[0063] A guide rod extends from the closed end of the cover shell 203, and a push frame 207 is slidably connected to the guide rod. The push frame 207 is provided with a slope 1, and a slope 2 is provided at the end of the slide bar 206 away from the axis of the cover shell 203. The slope 1 and the slope 2 are in contact with each other. When the slide bar 206 moves away from the axis of the cover shell 203, the push frame 207 can be pushed to move away from the connecting shaft 1 201 through the cooperation of the slope 1 and the slope 2. The push frame 207 is connected to the middle bracket 301 and can move with the middle bracket 301. In addition, the switch 1 is located on the side of the middle bracket 301 facing the connecting shaft 1 201. In addition, a limit ring is provided at the end of the guide rod, and a spring 3 208 located between the limit ring and the push frame 207 is provided on the outer sleeve of the guide rod.

[0064] When the motor 100 stops running due to a problem with the AC power, the generator 101 can still rotate for a period of time under the influence of the energy storage flywheel 102, so there will be a speed difference between the connecting shaft 1 201 and the connecting shaft 2 202. Figure 7Taking the perspective of as an example, it is equivalent to the rotating disk 205 rotating clockwise, and the cover shell 203 is stationary. At this time, the arc surface of the rotating disk 205 can drive the slide bar 206 to move away from the axis of the cover shell 203. Preferably, in order to reduce the friction between the two, a roller is installed at the end of the slide bar 206 facing the axis of the cover shell 203. The roller contacts the arc surface to reduce the friction. When the slide bar 206 moves, the push frame 207 is driven to move through the inclined plane 1 and the inclined plane 2. The push frame 207 moves with the middle bracket 301, so that the switch module 300 sequentially undergoes the upper The stages one, two and three mentioned in the text realize the smooth and smooth switching from AC power supply to DC power supply. It should be noted that when the roller on the slide bar 206 is located in the groove 2052, since a plug is formed between the groove 2052 and the slide bar 206, and the switching is completed at this time, the rotation of the rotating disk 205 is restricted, that is, the operation of the generator 101 is restricted. At the same time, since the elastic force of the spring three 208 will eventually give the slide bar 206 a movement trend in the radial direction close to the axis of the cover shell 203, the spring three 208 remains compressed at this time and cannot release the elastic force;

[0065] When the AC power problem is solved, the motor 100 starts, and the cover 203 first rotates with the slide bar 206. The transition chamfer between the groove 2052 and the arc surface can make the slide bar 206 leave the groove 2052 and re-contact the protrusion 2051. During this process, the spring three 208 will release the elastic force, so that the switch module 300 will perform the reverse action of the above-mentioned stages one, two, and three, thereby realizing the switching of the linear power supply to the AC power supply, and the generator 101 runs to provide power to the subway equipment.

[0066] From the above, we can know that:

[0067] This solution can realize the smooth and smooth live switching between AC power supply and DC power supply. On this basis: on the one hand, during normal use, the power supply and power failure of the AC power supply corresponding to the start and stop of the subway equipment are not affected, that is, the normal use of the AC power is not affected; on the other hand, when there is a problem with the AC power, the AC power can be automatically switched to the backup DC power supply. During the switching transition, the subway equipment can still operate normally. Therefore, the subway equipment has no obvious corresponding characteristics and is not easily perceived by passengers. As a public transportation equipment, it is not easy to cause panic among passengers;

[0068] When the AC power problem is repaired and solved, AC power is directly supplied, and the DC power supply can be automatically switched to AC power supply.

[0069] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An AC / DC dual power switching device, comprising an AC power supply and a DC power supply, characterized in that: It also includes a mounting frame, on which a connection module (200) and a switch module (300) are mounted; The AC power supply comprises an electric motor (100) and a generator (101), and the two are connected via a connection module (200). An energy storage flywheel (102) is arranged on the output shaft of the generator (101), and a brake (103) is arranged on the mounting frame. In normal use, the electric motor (100) drives the generator (101) to operate via the connection module (200), and the AC power generated by the generator (101) supplies power to subway equipment. When the AC power supply is normally interrupted, the brake (103) simultaneously stops the energy storage flywheel (102); The DC power supply includes a storage battery (104), the AC power supply and the DC power supply are connected in parallel, and the switch module (300) includes a switch 1 and a switch 2 respectively arranged in series on two parallel branches. When the AC power supply is abnormally powered off, the brake (103) is not activated, and the connection module (200) is driven by the speed difference between the motor (100) and the generator (101) to cooperate with the switch module (300) to realize automatic live switching between the AC power supply and the DC power supply.

2. The AC / DC dual power switching device according to claim 1, characterized in that: The switch module (300) comprises a side touch rod slidably mounted on a mounting frame, an external step is arranged on the outside of the side touch rod, two side touch rods are arranged and are respectively a side touch rod 1 (304) and a side touch rod 2 (306), the outer sleeve of the side touch rod 1 (304) is provided with a spring 1 (305) located between the external step and the mounting frame, the outer sleeve of the side touch rod 2 (306) is provided with a spring 2 (307) located between the external step and the mounting frame, the spring 1 (305) and the spring 2 (307) are insulated and the elastic force of both is used to drive the corresponding side touch rod to approach the other side touch rod; A middle bracket (301) is arranged between the two side touch rods, and a left touch rod (302) and a right touch rod (303) are arranged on both sides of the middle bracket (301), respectively; the left touch rod (302) can come into contact with the first side touch rod (304), and the two together form a switch one corresponding to the AC power supply; the right touch rod (303) can come into contact with the second side touch rod (306), and the two together form a switch two corresponding to the DC power supply.

3. The AC / DC dual power switching device according to claim 2, characterized in that: When the middle bracket (301) is at the middle position between the two side contact rods, both switch 1 and switch 2 are closed.

4. The AC / DC dual power switching device according to claim 3, characterized in that: The connection module (200) comprises a first connecting shaft (201) and a second connecting shaft (202) which are mounted on the mounting frame via bearings and are parallel to the sliding direction of the side touch rod, and the two connecting shafts are coaxial; The input end of the first connecting shaft (201) is connected to the motor (100), and the output end is coaxially mounted with a housing (203); the input end of the second connecting shaft (202) coaxially extends into the housing (203) and is mounted with a rotating disk (205), and the output end is connected to the generator (101).

5. The AC / DC dual power switching device according to claim 4, characterized in that: The cover shell (203) is in the shape of a cylindrical shell with one end open and provided with a shell cover (204) and one end closed, and the shell cover (204) is connected to the first connecting shaft (201).

6. The AC / DC dual power switching device according to claim 4, characterized in that: The outer circumferential surface of the cover shell (203) is provided with a sliding hole in the radial direction, and a sliding rod (206) is slidably installed in the sliding hole. The outer circumferential surface of the rotating disk (205) is provided with a protrusion (2051) and a groove (2052) and an arc surface located therebetween. When the motor (100) is running to drive the cover shell (203) to rotate, the rotation direction is rotation direction one. The protrusion (2051) is located in front of the groove (2052) along rotation direction one. Initially, the sliding rod (206) is located between the protrusion (2051) and the groove (2052), and the sliding rod (206) is in contact with the protrusion (2051).

7. The AC / DC dual power switching device according to claim 6, characterized in that: A roller is installed at the end of the slide bar (206) facing the axis of the cover shell (203), and the roller is in contact with the arc surface.

8. The AC / DC dual power switching device according to claim 6, characterized in that: A guide rod extends from the closed end of the cover shell (203), a push frame (207) is slidably connected to the guide rod, a limit ring is arranged at the end of the guide rod, and a spring (208) is sleeved outside the guide rod and located between the limit ring and the push frame (207); The push frame (207) is provided with a first inclined plane, and one end of the slide bar (206) away from the axis of the cover shell (203) is provided with a second inclined plane, and the first inclined plane is in contact with the second inclined plane. When the slide bar (206) moves away from the axis of the cover shell (203), the push frame (207) can be pushed to move away from the connecting shaft (201) through the cooperation of the first inclined plane and the second inclined plane. The push frame (207) is connected to the middle bracket (301), and the switch (1) is located on the side of the middle bracket (301) facing the connecting shaft (201).

9. The AC / DC dual power switching device according to claim 8, characterized in that: The connection between the groove (2052) and the arc surface is rounded.

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