A surge protector, intelligent switch cabinet and rapid current diversion method

Abstract

The invention relates to the technical field of power protection equipment, in particular to a surge protector, an intelligent switch cabinet and a rapid current shunting method, comprising: an outer shell, wherein an incoming terminal, an outgoing terminal and a grounding terminal are arranged in the outer shell; a switching piece is rotatably connected with the incoming terminal to change the current flow direction; an energy storage component is arranged in the outer shell, and the energy storage component has a tendency to make the switching piece move toward the outgoing terminal or the grounding terminal; an electromagnetic attraction device is installed in the outer shell and connected to the incoming terminal, and the electromagnetic attraction device can attract a counterweight iron block connected to the energy storage component when current passes through; a differential structure is connected to the energy storage component and the counterweight iron block, and the differential structure can drive the energy storage component to move after the counterweight iron block moves a certain stroke; a variable resistance mechanism is arranged in the outer shell, and the variable resistance mechanism can reduce the resistance value in the circuit when the counterweight iron block moves upward, thereby improving the safety of the power supply system.

Description

Technical Field

[0001] The invention relates to the technical field of power protection equipment, in particular to a surge protector, an intelligent switch cabinet and a rapid current diversion method. Background Art

[0002] Surge protectors are widely used electrical safety protection devices. Their function is to limit overvoltage and discharge surge current, thereby providing safety protection for various electronic equipment, instruments and meters, and communication lines. Surge protectors are generally connected in parallel with the protected equipment. When overvoltage occurs, they play a role in shunting and limiting voltage. In some applications, such as mobile base stations, surge protectors are also called lightning arresters. This type of surge protector is usually installed in mobile base stations in a track-mounted manner.

[0003] The surge protector mainly relies on the varistor installed inside it to work. When the varistor detects that the voltage in the line is very high, it can reduce its own resistance and guide the overcurrent in the line into the loop and conduct it underground, reducing the damage of the overcurrent to the power supply system. However, the working cycle of the varistor is limited. After experiencing several overcurrents, its own structure will also be affected. For example, aging will cause the loss or reduction of its own variable resistance effect. At this time, the shunt effect of the surge protector decreases, and after reaching a certain level, when the overcurrent occurs again, the surge protector may even explode. Therefore, the surge protector needs to be regularly inspected and replaced during use, and the cost of use and maintenance is high. Summary of the invention

[0004] The object of the present invention is to provide a surge protector, an intelligent switch cabinet and a rapid current diversion method to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A surge protector, comprising:

[0007] An outer shell, wherein an incoming terminal, an outgoing terminal and a grounding terminal are arranged inside the outer shell;

[0008] A switching piece is made of a conductive material and is rotatably connected to the incoming terminal. The switching piece can cooperate with the outgoing terminal or the grounding terminal to change the direction of current flow;

[0009] An energy storage component is arranged in the outer shell, and the energy storage component has a tendency to make the switching piece move toward the output terminal or the grounding terminal;

[0010] An electromagnetic attraction device is installed in the outer shell and connected to the incoming terminal, and the electromagnetic attraction device can attract the counterweight iron block connected to the energy storage assembly when current passes through;

[0011] A differential structure, connecting the energy storage assembly and the counterweight iron block, wherein the differential structure can drive the energy storage assembly to move after the counterweight iron block moves a certain distance;

[0012] The variable resistance mechanism is arranged in the outer shell, and the variable resistance mechanism can reduce the resistance value in the circuit when the counterweight iron block moves upward.

[0013] As a further solution of the present invention: the energy storage assembly includes two sets of guide plates arranged in the outer shell and a lifting member located between the two sets of guide plates, the guide plates are provided with vertical interlocking grooves, and the interlocking blocks formed on the lifting member can slide in the vertical interlocking grooves;

[0014] The lifting member is connected to a connecting shaft, one end of the connecting shaft is connected to the differential structure, and the other end is connected to the switching piece through a pulling structure;

[0015] The energy storage assembly further comprises an elastic structure connected to the lifting member, and the elastic structure is adapted to the through slot provided on the guide plate.

[0016] As a further solution of the present invention: the pulling structure includes a connecting member connected to the switching piece and an interlocking wheel rotatably connected to the end of the connecting shaft, the connecting member is formed with a retardation groove along its length direction, and the interlocking wheel can roll in the retardation groove.

[0017] As a further solution of the present invention: the elastic structure comprises a transverse rod connected to the lifting member, a telescopic shaft is slidably sleeved on the transverse rod, and a cylindrical spring is sleeved on the transverse rod, one end of the cylindrical spring is connected to the telescopic shaft, and the other end is connected to the lifting member;

[0018] A groove wheel is rotatably mounted on the telescopic shaft, and the groove wheel is rollingly matched with the side wall of the through groove.

[0019] As a further solution of the present invention: the side wall of the through groove is formed by two groups of symmetrical inclined surfaces, and a protrusion is formed at the connection of the two groups of inclined surfaces.

[0020] As a further solution of the present invention: the differential structure includes a limit ring coaxially connected to the end of the connecting shaft and a connecting sleeve connected to the counterweight iron block, and the connecting sleeve is slidably fitted with the limit ring.

[0021] As a further solution of the present invention: the variable resistance mechanism comprises a cylindrical resistor installed in the outer shell, a carbon brush is slidably attached to the cylindrical resistor, a sliding connection portion is provided on the carbon brush, and a guide member provided on the outer shell is slidably connected to the sliding connection portion;

[0022] The variable resistance structure also includes a transmission structure connecting the sliding connection part and the counterweight iron block.

[0023] As a further solution of the present invention: the transmission structure includes a guide member installed on the outer shell, a slider is slidably installed on the guide member, a connecting rod No. 1 and a connecting rod No. 2 are rotatably installed on the slider, the connecting rod No. 1 is rotatably connected to the counterweight iron block, and the connecting rod No. 2 is rotatably connected to the sliding connection part.

[0024] An intelligent switch cabinet comprises the surge protector and a switch cabinet body, wherein a circuit breaker, an undervoltage protector and a fuse are arranged in the switch cabinet body, wherein the circuit breaker, the undervoltage protector and the fuse are connected in series, and the surge protector is connected in parallel with the circuit breaker, the undervoltage protector and the fuse.

[0025] A rapid current diversion method for a surge protector as claimed in claim 1, comprising the following steps:

[0026] Step 1: When the line is struck by lightning or other external factors causing overcurrent in the line, the current flowing through the electromagnetic attraction device will also increase. At this time, the suction force of the electromagnetic attraction device is greater than the gravity of the counterweight iron block, and the counterweight iron block can be attracted to make the counterweight iron block move upward;

[0027] Step 2: When the counterweight iron block moves upward, it will drive the variable resistance mechanism to move, so that the resistance value in the circuit decreases. At this time, the current flowing through the electromagnetic attraction device further increases, and the suction force of the electromagnetic attraction device is increased, so that the counterweight iron block further accelerates its upward movement;

[0028] Step 3: When the counterweight iron block rises to a certain height, its speed is also greater. At this time, the differential structure operates, driving the energy storage component to operate, so that the switching piece quickly switches from the outgoing terminal to the grounding terminal to conduct the current into the ground;

[0029] Step 4: When the current in the line returns to normal, the current in the loop will also decrease. The suction force of the electromagnetic attraction device is less than the gravity of the counterweight iron block. At this time, the counterweight iron block moves downward, and the resistance in the loop is increased through the variable resistance mechanism. Then the counterweight iron block will accelerate downward under the action of gravity, and then drive the switching piece to reset under the action of the differential structure, so that the line returns to its initial state.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] By setting the energy storage component, when the switching piece completes the switching, the slot wheel still has a tendency to move, so that when the switching piece is in contact with the ground terminal and the output terminal, it can have stable electrical performance, ensuring the stability of the power supply system, and when the slot wheel moves over the protruding part, it can actively drive the lifting member to move, thereby speeding up the switching speed of the switching piece and reducing the impact of overcurrent caused by lightning strikes on the power system;

[0032] By setting the differential structure, when an overcurrent occurs in the line, the counterweight iron block can drive the connecting sleeve to perform an accelerated movement of a certain distance first, and then instantly drive the lifting member to move upward, thereby increasing the speed of the lifting member during movement, so as to increase the switching speed of the switching piece. In addition, the connecting sleeve and the limit ring can generate an impact when they cooperate, and the impact can increase the force of the lifting member to move upward, thereby avoiding the situation where the lifting member is subjected to too little pulling force, resulting in the switching piece being unable to perform the switching action, thereby improving the switching success rate.

[0033] By setting up a variable resistance mechanism, the resistance value in series in the circuit changes during the lifting and lowering of the counterweight iron block, thereby increasing the acceleration of the counterweight iron block during the lifting and lowering process, so that when the connecting sleeve drives the connecting shaft to move, the lifting member can obtain a greater traction speed, further ensuring the switching speed of the switching piece while improving the accuracy of its switching action execution. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The figure is a schematic diagram of the structure of an embodiment of an intelligent switch cabinet.

[0035] Figure 2 The figure is a schematic structural diagram of an embodiment of a surge protector.

[0036] Figure 3 The figure is a schematic diagram of the internal structure of an outer shell in one embodiment of a surge protector.

[0037] Figure 4 The figure is a partial structural diagram of a variable resistance mechanism in an embodiment of a surge protector.

[0038] Figure 5 The figure is a schematic diagram of the structure of an energy storage component in one embodiment of a surge protector.

[0039] Figure 6 This is a structural explosion diagram of an energy storage component in an embodiment of a surge protector.

[0040] Figure 7 The figure is a schematic diagram of a differential structure in one embodiment of a surge protector.

[0041] Figure 8 The figure is a schematic diagram of the structure of the transmission structure in one embodiment of the surge protector.

[0042] In the figure: 1. outer shell; 2. incoming terminal; 3. grounding terminal; 4. outgoing terminal; 5. cylindrical resistor; 6. carbon brush; 601. sliding connection; 7. guide; 8. electromagnetic attraction device; 9. switching piece; 10. connecting piece; 1001. hysteresis groove; 11. switch cabinet body; 12. interlocking wheel; 13. connecting shaft; 14. lifting piece; 1401. interlocking block; 15. horizontal rod; 16. cylindrical spring; 17. telescopic shaft; 18. groove wheel; 19. guide plate; 1901. inclined surface; 1902. protrusion; 1903. vertical interlocking groove; 20. limiting ring; 21. connecting sleeve; 22. counterweight iron block; 23. No. 1 connecting rod; 24. sliding block; 25. guide; 26. No. 2 connecting rod. DETAILED DESCRIPTION

[0043] 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.

[0044] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0045] See also Figure 2 to Figure 8 In an embodiment of the present invention, a surge protector includes: an outer shell 1, a switching piece 9, an energy storage component, an electromagnetic attraction device 8, a differential structure and a variable resistance mechanism, so that when an overcurrent occurs in the line, the counterweight iron block 22 can drive the connecting sleeve 21 to perform an acceleration movement of a certain distance first, and then instantly drive the lifting member 14 to move upward, thereby increasing the speed of the lifting member 14 during movement, so as to increase the switching speed of the switching piece 9, and the connecting sleeve 21 can generate an impact when cooperating with the limit ring 20, and the impact can increase the force of the lifting member 14 to move upward, thereby avoiding the situation where the pulling force on the lifting member 14 is too small, resulting in the inability of the switching piece 9 to perform the switching action, thereby improving the switching success rate.

[0046] The details are as follows: the outer shell 1 is provided with an incoming terminal 2, an outgoing terminal 4 and a grounding terminal 3;

[0047] The switching piece 9 is made of conductive material and is rotatably connected to the input terminal 2. The switching piece 9 can cooperate with the output terminal 4 or the ground terminal 3 to change the current flow direction;

[0048] The energy storage assembly is arranged in the outer shell 1, and the energy storage assembly has a tendency to make the switching piece 9 move toward the output terminal 4 or the grounding terminal 3. The energy storage assembly includes two groups of guide plates 19 arranged in the outer shell 1 and a lifting member 14 located between the two groups of guide plates 19. The guide plates 19 are provided with vertical interlocking grooves 1903, and the interlocking blocks 1401 formed on the lifting member 14 can slide in the vertical interlocking grooves 1903.

[0049] The lifting member 14 is connected to a connecting shaft 13, one end of the connecting shaft 13 is connected to the differential structure, and the other end is connected to the switching piece 9 through a pulling structure, the pulling structure includes a connecting member 10 connected to the switching piece 9 and an interlocking wheel 12 rotatably connected to the end of the connecting shaft 13, the connecting member 10 is formed with a hysteresis groove 1001 along its length direction, and the interlocking wheel 12 can roll in the hysteresis groove 1001;

[0050] The energy storage assembly further includes an elastic structure connected to the lifting member 14, the elastic structure is adapted to the through slot provided on the guide plate 19, the side wall of the through slot is formed by two groups of symmetrical inclined surfaces 1901, and a protrusion 1902 is formed at the connection of the two groups of inclined surfaces 1901, the elastic structure includes a transverse rod 15 connected to the lifting member 14, a telescopic shaft 17 is slidably sleeved on the transverse rod 15, and a columnar spring 16 is sleeved on the transverse rod 15, one end of the columnar spring 16 is connected to the telescopic shaft 17, and the other end is connected to the lifting member 14;

[0051] A groove wheel 18 is rotatably mounted on the telescopic shaft 17 , and the groove wheel 18 is in rolling cooperation with the side wall of the through groove.

[0052] In the initial state, the groove wheel 18 is at the lower part of the lower inclined surface 1901, and the cylindrical spring 16 is in a compressed state. It is worth noting that at this time, the groove wheel 18 has not moved to the lower end of the inclined surface 1901, but under the drive of the cylindrical spring 16, the groove wheel 18 still has a tendency to move downward, and through the connecting shaft 13, the engaging wheel 12 and the connecting piece 10, the switching piece 9 is driven to deflect downward, thereby ensuring that the switching piece 9 and the output terminal 4 have good abutment performance, so that the two can maintain relatively stable electrical performance.

[0053] When an overcurrent occurs in the circuit, the current in the loop will also increase. At this time, the electromagnetic attraction device 8 will generate attraction and attract the differential structure to move, so that the connecting shaft 13 can move upward and drive the lifting member 14 to move upward. During this process, the lifting member 14 drives the groove wheel 18 to move upward through the transverse rod 15 and the telescopic shaft 17. At the same time, the cylindrical spring 16 is further compressed until the groove wheel 18 moves over the protrusion 1902. The cylindrical spring 16 will release the elastic potential energy and actively drive the groove wheel 18 to move upward along the other inclined surface 1901. When the lifting member 14 moves upward, it will drive the engaging wheel 12 to move upward. While the engaging wheel 12 rolls in the hysteresis groove 1001, it deflects the switching piece 9 until the switching piece 9 abuts against the grounding terminal 3. The groove wheel 18 will stop moving. At this time, the groove wheel 18 has also moved to the end of the upper inclined surface 1901, so that it still has a tendency to move upward, thereby ensuring that the switching piece 9 and the grounding terminal 3 have good electrical performance.

[0054] Through the above-mentioned arrangement, when the switching piece 9 completes the switching, the groove wheel 18 still has a tendency to move, so that the switching piece 9 can have stable electrical performance when it abuts against the grounding terminal 3 and the output terminal 4, thereby ensuring the stability of the power supply system, and when the groove wheel 18 moves over the protrusion 1902, it can actively drive the lifting member 14 to move, thereby accelerating the switching speed of the switching piece 9 and reducing the impact of overcurrent caused by lightning strikes and the like on the power system.

[0055] The above-mentioned “line” refers to the line in the power supply system, and the “loop” refers to the line through which the current enters the outlet terminal 4 through the incoming terminal 2 and flows out.

[0056] See also Figure 6-7 The electromagnetic attraction device 8 is installed in the outer shell 1 and connected to the incoming terminal 2. The electromagnetic attraction device 8 can attract the counterweight iron block 22 connected to the energy storage component when current passes through;

[0057] The differential structure connects the energy storage component and the counterweight iron block 22. The differential structure can drive the connecting shaft 13 to move after the counterweight iron block 22 moves a certain distance. The differential structure includes a limit ring 20 coaxially connected to the end of the connecting shaft 13 and a connecting sleeve 21 connected to the counterweight iron block 22. The connecting sleeve 21 slides with the limit ring 20.

[0058] When an overcurrent occurs in the circuit, the current in the loop will also increase. At this time, the current flowing through the electromagnetic attraction device 8 will also increase, and the electromagnetic attraction device 8 will generate attraction. The attraction acts on the counterweight iron block 22 to make the counterweight iron block 22 move upward. When the counterweight iron block 22 moves upward, it can drive the connecting sleeve 21 to move upward. In the initial state, the counterweight iron block 22 will abut against the lifting member 14 due to its own gravity, so that in the initial stage of the upward movement of the counterweight iron block 22, the connecting sleeve 21 will move upward relative to the limit ring 20, that is, relative sliding occurs between the two, and at this time, the groove wheel 18 is on the column Under the action of the shaped spring 16, it still has a tendency to move downward, so that the switching piece 9 will not be separated from the outlet terminal 4, and when the counterweight iron block 22 moves upward, the attraction of the electromagnetic attraction device 8 must be in a state greater than the gravity of the counterweight iron block 22, so that the counterweight iron block 22 is in an accelerated motion state when it moves upward. At this time, when the counterweight iron block 22 drives the connecting sleeve 21 to move to the position, the connecting sleeve 21 can instantly contact the limit ring 20, generate a certain impact force, and drive the lifting member 14 to move upward quickly, thereby realizing the deflection of the switching piece 9 to abut against the grounding terminal 3, and guiding the overcurrent in the line to the underground.

[0059] Based on the above settings, it can be seen that when the line is overcurrent, the counterweight iron block 22 can accelerate upward relative to the lifting member 14. When the counterweight iron block 22 moves to a certain height, it will have a certain speed. At this time, through the cooperation of the connecting sleeve 21 and the limit ring 20, the lifting member 14 can be driven to move upward, thereby quickly driving the switching piece 9 to deflect and realizing the rapid switching of the switching piece 9.

[0060] At the same time, at the moment when the connecting sleeve 21 cooperates with the limiting ring 20 to drive the lifting member 14 to move upward, a certain impact force will be generated between the connecting sleeve 21 and the limiting ring 20. The impact force can stably drive the lifting member 14 to move. Compared with making the lifting member 14 directly connected to the counterweight iron block 22, it avoids the lifting member 14 being unable to overcome the elastic force of the columnar spring 16 and drive the switching piece 9 to perform the switching action due to insufficient suction of the electromagnetic attraction device 8.

[0061] Through the above-mentioned arrangement, when an overcurrent occurs in the line, the counterweight iron block 22 can drive the connecting sleeve 21 to perform an accelerated movement of a certain distance first, and then instantly drive the lifting member 14 to move upward, thereby increasing the speed of the lifting member 14 during movement, so as to increase the switching speed of the switching piece 9. In addition, the connecting sleeve 21 can generate an impact when cooperating with the limit ring 20. The impact can increase the force of the lifting member 14 to move upward, and avoid the situation where the pulling force on the lifting member 14 is too small, resulting in the switching piece 9 being unable to perform the switching action, thereby improving the switching success rate.

[0062] It is worth noting that the above switching process will be carried out instantly when the line is overcurrent.

[0063] Similarly, when the current value in the line returns to normal, the attraction of the electromagnetic attraction device 8 will decrease. At this time, the counterweight iron block 22 will accelerate downward under the action of gravity. When the connecting sleeve 21 abuts against the lifting member 14, an impact will be generated again, and the lifting member 14 will be driven to reset, so that the switching piece 9 switches to a state connected to the output terminal 4.

[0064] It should be noted that the above-mentioned electromagnetic attraction device 8 is a reference to the prior art, which is a device using the electromagnetic principle. It generates magnetic force by energizing the internal coil, and demagnetizes the coil by de-energizing the coil and causing the magnetic force to disappear.

[0065] See also Figure 3 , Figure 4 , Figure 8 The variable resistance mechanism is arranged in the outer shell 1, and the variable resistance mechanism can reduce the resistance value in the circuit when the counterweight iron block 22 moves upward. The variable resistance mechanism includes a columnar resistor 5 installed in the outer shell 1, and a carbon brush 6 is slidably attached to the columnar resistor 5. The carbon brush 6 is provided with a sliding connection part 601, and a guide 7 arranged on the outer shell 1 is slidably connected to the sliding connection part 601;

[0066] The variable resistance structure also includes a transmission structure connecting the sliding connection part 601 and the counterweight iron block 22, and the transmission structure includes a guide member 25 installed on the outer shell 1, and a slider 24 is slidably installed on the guide member 25, and a connecting rod No. 1 23 and a connecting rod No. 2 26 are rotatably installed on the slider 24, the connecting rod No. 1 23 is rotatably connected to the counterweight iron block 22, and the connecting rod No. 2 26 is rotatably connected to the sliding connection part 601.

[0067] Among them, the incoming terminal 2, the cylindrical resistor 5, the carbon brush 6, the electromagnetic attraction device 8, and the switching piece 9 are electrically connected in sequence, and in the initial state, the carbon brush 6 is at the upper part of the cylindrical resistor 5. At this time, the resistance value connected in series in the loop is the largest, which can minimize the current value flowing through the loop when the line current is normal, thereby reducing power loss.

[0068] When an overcurrent occurs in the circuit, the current value in the circuit will also increase, causing the counterweight iron block 22 to move upward. At this time, the counterweight iron block 22 pushes the slider 24 to slide along the length direction of the guide member 25 through the No. 1 connecting rod 23. At the same time, the slider 24 drives the carbon brush 6 to move downward along the length direction of the guide member 7 through the No. 2 connecting rod 26. At this time, the resistance value in the circuit will decrease, causing the current in the circuit to increase, and the attraction generated by the electromagnetic attraction device 8 will also increase, thereby increasing its attraction with the counterweight iron block 22, making the counterweight iron block 22 move upward with a greater acceleration, so that when the connecting sleeve 21 cooperates with the limit ring 20, the connecting sleeve 21 has a greater speed, further ensuring that the switching piece 9 can perform the switching action.

[0069] Similarly, when the current in the circuit returns to normal, the counterweight iron block 22 will also move downward under the action of its own gravity. At this time, the carbon brush 6 will move upward, increasing the resistance value in the circuit, thereby further reducing the suction force of the electromagnetic attraction device 8. As the counterweight iron block 22 moves downward, the counterweight iron block 22 accelerates as it descends, thereby increasing the speed at which the connecting sleeve 21 abuts against the lifting member 14, ensuring that the switching piece 9 can be reset.

[0070] Through the above-mentioned arrangement, during the lifting and lowering process of the counterweight iron block 22, the resistance value connected in series in the circuit changes accordingly, thereby increasing the acceleration of the counterweight iron block 22 during the lifting and lowering process, so that when the connecting sleeve 21 drives the connecting shaft 13 to move, the lifting member 14 can obtain a greater traction speed, further ensuring the switching speed of the switching piece 9 while improving the accuracy of its switching action execution.

[0071] Furthermore, when the switching piece 9 is switched to the ground terminal 3 , the resistance in the loop is extremely small, thereby preventing heating caused by a large current flowing through the columnar resistor 5 .

[0072] See also Figure 1 As an embodiment of the present invention, an intelligent switch cabinet is also proposed, including a surge protector as described above, and also including a switch cabinet body 11, wherein the switch cabinet body 11 is provided with a circuit breaker, an undervoltage protector and a fuse, wherein the circuit breaker, the undervoltage protector and the fuse are connected in series, and the surge protector is connected in parallel with the circuit breaker, the undervoltage protector and the fuse.

[0073] A rapid current diversion method for a surge protector as described above comprises the following steps:

[0074] Step 1: When the line is struck by lightning or other external factors causing overcurrent in the line, the current flowing through the electromagnetic attraction device 8 will also increase. At this time, the suction force of the electromagnetic attraction device 8 is greater than the gravity of the counterweight iron block 22, and the counterweight iron block 22 can be attracted to make the counterweight iron block 22 move upward;

[0075] Step 2: When the counterweight iron block 22 moves upward, it will drive the variable resistance mechanism to move, so that the resistance value in the circuit decreases. At this time, the current flowing through the electromagnetic attraction device 8 is further increased, and the suction force of the electromagnetic attraction device 8 is increased, so that the counterweight iron block 22 is further accelerated to move upward;

[0076] Step 3: When the counterweight iron block 22 rises to a certain height, its speed is also greater. At this time, the differential structure is activated, driving the energy storage component to operate, so that the switching piece 9 is quickly switched from the outlet terminal 4 to the grounding terminal 3 to conduct the current into the ground;

[0077] Step 4: When the current in the circuit returns to normal value, the current in the loop will also decrease. The suction force of the electromagnetic attraction device 8 is less than the gravity of the counterweight iron block 22. At this time, the counterweight iron block 22 moves downward, and at the same time, the resistance in the loop is increased through the variable resistance mechanism. Then, the counterweight iron block 22 will accelerate downward under the action of gravity, and then drive the switching piece 9 to reset under the action of the differential structure, so that the circuit returns to its initial state.

[0078] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0079] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A surge protector, characterized in that: include: An outer shell (1), wherein an incoming terminal (2), an outgoing terminal (4) and a grounding terminal (3) are arranged inside the outer shell (1); A switching piece (9) is made of a conductive material and is rotatably connected to the incoming terminal (2); the switching piece (9) can cooperate with the outgoing terminal (4) or the grounding terminal (3) to change the direction of current flow; An energy storage component is arranged in the outer shell (1), and the energy storage component has a tendency to make the switching piece (9) move towards the outlet terminal (4) or the grounding terminal (3); An electromagnetic attraction device (8) is installed in the outer shell (1) and connected to the incoming terminal (2), and the electromagnetic attraction device (8) is capable of attracting a counterweight iron block (22) connected to the energy storage component when current passes through; A differential structure, connecting the energy storage component and the counterweight iron block (22), the differential structure being capable of driving the energy storage component to move after the counterweight iron block (22) moves a certain distance; A variable resistance mechanism is arranged in the outer shell (1), and the variable resistance mechanism can reduce the resistance value in the circuit when the counterweight iron block (22) moves upward; The energy storage assembly comprises two groups of guide plates (19) arranged in the outer shell (1) and a lifting member (14) located between the two groups of guide plates (19), the guide plates (19) being provided with vertical interlocking grooves (1903), and an interlocking block (1401) formed on the lifting member (14) being able to slide in the vertical interlocking grooves (1903); The lifting member (14) is connected to a connecting shaft (13), one end of the connecting shaft (13) is connected to the differential structure, and the other end is connected to the switching piece (9) via a pulling structure; The energy storage assembly further comprises an elastic structure connected to the lifting member (14), the elastic structure being adapted to fit a through slot provided on the guide plate (19); The differential structure comprises a limit ring (20) coaxially connected to the end of the connecting shaft (13) and a connecting sleeve (21) connected to the counterweight iron block (22), wherein the connecting sleeve (21) and the limit ring (20) are slidably fitted. The variable resistance mechanism comprises a columnar resistor (5) installed in the outer shell (1), a carbon brush (6) slidably attached to the columnar resistor (5), a sliding connection portion (601) being provided on the carbon brush (6), and a guide (7) provided on the outer shell (1) being slidably connected to the sliding connection portion (601); The variable resistance mechanism also includes a transmission structure connecting the sliding connection part (601) and the counterweight iron block (22).

2. A surge protector according to claim 1, characterized in that: The pulling structure comprises a connecting member (10) connected to the switching piece (9) and an engaging wheel (12) rotatably connected to the end of the connecting shaft (13); the connecting member (10) is formed with a hysteresis groove (1001) along its length direction, and the engaging wheel (12) is capable of rolling in the hysteresis groove (1001).

3. A surge protector according to claim 1, characterized in that: The elastic structure comprises a transverse rod (15) connected to the lifting member (14), a telescopic shaft (17) being slidably sleeved on the transverse rod (15), and a columnar spring (16) being sleeved on the transverse rod (15), one end of the columnar spring (16) being connected to the telescopic shaft (17) and the other end being connected to the lifting member (14); A groove wheel (18) is rotatably mounted on the telescopic shaft (17), and the groove wheel (18) is in rolling engagement with the side wall of the through groove.

4. A surge protector according to claim 1, characterized in that: The side wall of the through groove is formed by two groups of symmetrical inclined surfaces (1901), and a protrusion (1902) is formed at the connection between the two groups of inclined surfaces (1901).

5. A surge protector according to claim 1, characterized in that: The transmission structure comprises a guide member (25) mounted on the outer shell (1), a slider (24) being slidably mounted on the guide member (25), a first connecting rod (23) and a second connecting rod (26) being rotatably mounted on the slider (24), the first connecting rod (23) being rotatably connected to the counterweight iron block (22), and the second connecting rod (26) being rotatably connected to the sliding connection portion (601).

6. An intelligent switch cabinet, characterized in that: The invention comprises a surge protector as claimed in claim 1, and further comprises a switch cabinet body (11), wherein a circuit breaker, an undervoltage protector and a fuse are arranged in the switch cabinet body (11), wherein the circuit breaker, the undervoltage protector and the fuse are connected in series, and the surge protector is connected in parallel with the circuit breaker, the undervoltage protector and the fuse.

7. A rapid current diversion method for a surge protector as claimed in claim 1, characterized in that: The following steps are involved: Step 1: When the line is struck by lightning or other external factors causing overcurrent in the line, the current flowing through the electromagnetic attraction device (8) will also increase. At this time, the suction force of the electromagnetic attraction device (8) is greater than the gravity of the counterweight iron block (22), and the counterweight iron block (22) can be attracted to make the counterweight iron block (22) move upward; Step 2: When the counterweight iron block (22) moves upward, it will drive the variable resistance mechanism to move, so that the resistance value in the circuit decreases. At this time, the current flowing through the electromagnetic attraction device (8) is further increased, and the suction force of the electromagnetic attraction device (8) is increased, so that the counterweight iron block (22) is further accelerated to move upward; Step 3: When the counterweight iron block (22) rises to a certain height, its speed is also greater. At this time, the differential structure is activated, driving the energy storage component to operate, so that the switching piece (9) is quickly switched from the output terminal (4) to the grounding terminal (3) to conduct the current into the ground; Step 4: When the current in the circuit returns to normal value, the current in the loop will also decrease, and the suction force of the electromagnetic attraction device (8) is smaller than the gravity of the counterweight iron block (22). At this time, the counterweight iron block (22) moves downward, and at the same time, the resistance in the loop is increased through the variable resistance mechanism. Then, the counterweight iron block (22) will accelerate downward under the action of gravity, and then drive the switching piece (9) to reset under the action of the differential structure, so that the circuit returns to its initial state.

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