An intelligent protection device and protection method for a ring main unit switchgear

Abstract

The present invention discloses an intelligent protection device for a ring main unit switchgear, which includes a switchgear body. Inside the switchgear body, there is a placement cavity. One side of the placement cavity is provided with a warning cavity, and the other side is provided with an exchange cavity. The lower side of the placement cavity is provided with a driving cavity. The top of the placement cavity is fixedly connected with a controller. The bottom of the placement cavity is rotatably connected with a placement board. A slider is slidably connected inside the warning cavity, and a warning sign is fixedly connected to the top of the slider. An air exchange pipe is provided inside the exchange cavity. A driving shaft and a rotating shaft are rotatably connected inside the driving cavity. A worm and two cams are provided on the outer side of the driving shaft. A worm gear and a number of fan blades are fixedly connected to the outer side of the rotating shaft. By setting the placement cavity, the warning cavity, the driving cavity, and the exchange cavity, the present invention can adopt different working modes according to different situations and play a protective role for the electrical appliances inside.

Description

Technical Field

[0001] The present invention relates to the field of intelligent protection devices for switch cabinets, and particularly to an intelligent protection device and protection method for ring main unit switch cabinets. Background Art

[0002] A ring main unit switch cabinet is a set of high-voltage switchgear installed in a steel plate metal cabinet or made into a prefabricated sectionalized ring main unit power supply unit. Its core part uses a load switch and a fuse, and has the advantages of simple structure, small volume, low price, improved power supply parameters and performance, and power supply safety. It is widely used in distribution substations and box-type substations in load centers such as urban residential areas, high-rise buildings, large public buildings, and industrial enterprises. Under the existing technology, the protection effect of the ring main unit switch cabinet is not good enough. When the heat generated by the electrical equipment in the cabinet is too high, there is no warning device, which is prone to fire. When the cabinet is flooded, the water cannot be discharged, which is prone to cause short circuits of electrical equipment and the safety is not strong. Summary of the Invention

[0003] The purpose of the present invention is to solve the deficiencies in the existing technology, and to propose an intelligent protection device and protection method for ring main unit switch cabinets, so as to solve the problems existing in the existing technology.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] An intelligent protection device for a ring main unit switch cabinet includes a switch cabinet body. A placement cavity is provided inside the switch cabinet body. A warning cavity is provided on one side of the placement cavity, and an exchange cavity is provided on the other side of the placement cavity. A drive cavity is provided below the placement cavity;

[0006] A controller is fixedly connected to the top of the placement cavity. A placement plate is rotatably connected to the bottom of the placement cavity. A drainage groove is provided on one side of the placement plate, and a drain pipe is fixedly connected to the bottom of the drainage groove;

[0007] A slider is slidably connected in the warning cavity. A warning sign is fixedly connected to the top of the slider. A plurality of clamping blocks are provided on one side of the slider;

[0008] An air exchange pipe is provided in the exchange cavity. The drain pipe passes through both sides of the exchange cavity and is fixedly connected to the switch cabinet body;

[0009] A drive shaft and a rotating shaft are rotatably connected in the drive cavity. A worm and two cams are provided on the outer side of the drive shaft. A worm gear and a plurality of fan blades are fixedly connected to the outer side of the rotating shaft. The worm gear meshes with the worm.

[0010] Preferably, a clamping groove is provided on one side of the placement cavity, the clamping groove is correspondingly arranged with the clamping block, sliding grooves are provided on both sides of the inner wall of the placement cavity, a pressing plate is slidably connected to the two sliding grooves together, one end of the pressing plate is fixedly connected with an extension rod, the extension rod passes through the placement cavity and is slidably connected with the switch cabinet body, and a pressing spring is fixedly connected between the upper side of the pressing plate and the top of the placement cavity.

[0011] Preferably, a first sinking groove is provided on the lower side of the placement plate, a permanent magnet is fixedly connected in the first sinking groove, two first avoiding grooves are provided on the bottom surface of the placement cavity, and the first avoiding grooves are correspondingly arranged with the cams one by one.

[0012] Preferably, a plurality of counterbores are provided on one side of the slider, the clamping block is correspondingly arranged with the counterbores and is slidably connected therewith, a fixing spring is fixedly connected between the bottom of the counterbore of the clamping block and the bottom of the hole, and a second avoiding groove is provided on one side of the placement cavity, and the second avoiding groove is correspondingly arranged with the clamping block.

[0013] Preferably, a through groove is provided on the top of the warning cavity, a baffle is rotatably connected in the through groove, a limiting plate is provided on the lower side of the baffle, and the limiting plate is fixedly connected with the inner wall of the through groove.

[0014] Preferably, the driving shaft includes an inner shaft, a motor is fixedly connected to one side of the inner wall of the driving cavity, the spindle end of the motor is fixedly connected with one end of the inner shaft, the other end of the inner shaft is rotatably connected with the other side of the inner wall of the driving cavity, a first outer shaft and a second outer shaft are rotatably connected to the outside of the inner shaft, the two cams are coaxially fixedly connected with the first outer shaft and the second outer shaft respectively, a through hole is provided in the middle of the worm, the first outer shaft and the second outer shaft are both rotatably connected with the through hole, and a plurality of connecting blocks are fixedly connected between the outer wall of the inner shaft and the inner wall of the through hole.

[0015] Preferably, a first annular groove is provided on one side of the first outer shaft, a sleeve is slidably connected in the first annular groove, a plurality of fixing rods are fixedly connected to one side of the sleeve, the fixing rods pass through the bottom of the first annular groove and are fixedly connected with a fixing ring, and a plurality of limiting springs are fixedly connected between one side of the sleeve and the bottom of the first annular groove. An annular electromagnet is fixedly connected to one side of the inner wall of the driving cavity, and the electromagnet is correspondingly arranged with the fixing ring.

[0016] Preferably, a second annular groove is provided on one side of the second outer shaft, the second annular groove is correspondingly arranged with the sleeve, a plurality of splines are fixedly connected to the outside of the sleeve, a plurality of first key grooves are provided on the inner wall of the first annular groove, a plurality of second key grooves are provided on the inner wall of the second annular groove, and the first key grooves and the second key grooves are correspondingly arranged with the splines and are slidably connected therewith. A plurality of fixing grooves are provided on one side of the sleeve, and the fixing grooves are correspondingly arranged with the connecting blocks one by one.

[0017] A protection method for an intelligent protection device of a ring network switchgear, the protection method is as follows:

[0018] a. During normal use, the cam matches the permanent magnet, the electromagnet attracts the fixed ring, and the first outer shaft and the second outer shaft do not rotate together with the inner shaft. At this time, the motor is started, the motor drives the inner shaft and the worm to rotate together, the worm drives the worm wheel and the rotating shaft to rotate together, and the rotating shaft drives the fan blade to rotate to generate air flow, which enters the placement cavity through the air exchange pipe for heat dissipation;

[0019] b. When there is water accumulation in the placement cavity, the electromagnet releases the fixed ring, and the sleeve enters from the first annular groove into the second annular groove. At this time, the first outer shaft and the second outer shaft rotate together with the inner shaft, the first outer shaft and the second outer shaft drive the cam to rotate together, and the cam lifts one side of the placement plate, so that the accumulated water is discharged from the drain pipe;

[0020] c. When the temperature in the placement cavity is too high, the electromagnet releases the fixed ring, and at the same time the motor rotates in the reverse direction, the cam rotates in the reverse direction to lift the slider, and the slider then ejects the warning sign out of the warning cavity for warning the user.

[0021] The advantages of the present invention are as follows: An intelligent protection device and a protection method for a ring network switchgear provided by the present invention can adopt different working modes according to different situations. During normal operation, it can dissipate heat from the placement cavity. When there is water accumulation in the placement cavity, it can drain the water. When the temperature in the placement cavity is too high, it can warn the user. It can not only protect the internal electrical appliances, but also avoid affecting the external environment, improving the safety of the ring network switchgear. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the basic structural schematic diagram of the present invention;

[0023] Figure 2 is Figure 1 the partial enlarged view at A in

[0024] Figure 3 is Figure 1 the partial enlarged view at B in

[0025] Figure 4 is Figure 3 the C-C cross-sectional view in

[0026] Figure 5 is Figure 4 the partial enlarged view at D in

[0027] Figure 6 is the basic structural schematic diagram of the sleeve. DETAILED DESCRIPTION OF THE INVENTION

[0028] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Embodiment 1

[0029] As Figures 1-6 shown, an intelligent protection device for a ring main unit switchgear provided by the present invention includes a switchgear body 1. A placement cavity 11 is provided inside the switchgear body 1. A warning cavity 12 is provided on one side of the placement cavity 11. An exchange cavity 13 is provided on the other side of the placement cavity 11. A drive cavity 14 is provided below the placement cavity 11. A controller 111 is fixedly connected to the top of the placement cavity 11. The controller 111 integrates electronic components such as a temperature sensor, a humidity sensor, and a PLC control module, and can control the electronic devices inside the switchgear body 1. A placement plate 2 is rotatably connected to the bottom of the placement cavity 11. The upper side of the placement plate 2 is used to place various electronic devices. A drainage groove 21 is provided on one side of the placement plate 2. The drainage groove 21 is arranged in an arc shape and can gather the accumulated water at the bottom of the drainage groove 21. A drain pipe 22 is fixedly connected to the bottom of the drainage groove 21. The drain pipe 22 is used to discharge the accumulated water at the bottom of the drainage groove 21 to prevent the accumulated water inside the switchgear body 1 from affecting the normal use of the electronic devices. A slider 3 is slidably connected inside the warning cavity 12. A warning sign 31 is fixedly connected to the top of the slider 3. The warning sign 31 can extend out of the warning cavity 12 when the temperature is too high, so as to give a warning to the user. A plurality of clamping blocks 32 are provided on one side of the slider 3. The clamping blocks 32 can fix the warning sign 31. An air exchange pipe 131 is provided inside the exchange cavity 13. The drain pipe 22 passes through both sides of the exchange cavity 13 and is fixedly connected to the switchgear body 1. A drive shaft 4 and a rotating shaft 5 are rotatably connected inside the drive cavity 14. A worm 6 and two cams 7 are provided on the outer side of the drive shaft 4. A worm gear 51 and a plurality of fan blades 52 are fixedly connected to the outer side of the rotating shaft 5. The worm gear 51 meshes with the worm 6, and the worm gear 51 can drive the worm 6 and the rotating shaft 5 to rotate together. The rotation of the rotating shaft 5 drives the fan blades 52 to rotate together. When the fan blades 52 rotate, an air flow is generated. The air flow enters the placement cavity 11 from the drive cavity 14 through the air exchange pipe 131, so as to achieve the effect of dissipating heat from the electronic devices inside the placement cavity 11.

[0030] On one side of the slider 3, there are several counterbores 33. The clamping blocks 32 are arranged corresponding to the counterbores 33 and are slidably connected. A fixing spring 34 is fixedly connected between the bottom of the clamping block 32 and the bottom of the counterbore 33. On one side of the placement cavity 11, there is a second avoidance groove 117, which is arranged corresponding to the clamping block 32. When the cam 7 contacts the arc surface of the clamping block 32, the cam 7 exerts extrusion on the arc surface of the clamping block 32, thereby pressing the clamping block 32 back into the counterbore 33 and compressing the fixing spring 34. When the cam 7 contacts the right-angle surface at the bottom of the clamping block 32, the cam 7 will lift the clamping block 32, so that the slider 3 slides upward along the warning cavity 12. At the top of the warning cavity 12, there is a through groove 121. A baffle 122 is rotatably connected in the through groove 121. A torsion spring is sleeved on the rotating shaft of the baffle 122. A limiting plate 123 is arranged on the lower side of the baffle 122, and the limiting plate 123 is fixedly connected to the inner wall of the through groove 121. The upward movement of the slider 3 drives the warning sign 31 to move upward together and push open the baffle 122, so that the warning sign 31 moves to the outside of the warning cavity 12 to warn the user. When the slider 3 moves upward, the arc surface of the clamping block 32 is squeezed by the inner wall of the warning cavity 12 and is pressed back into the counterbore 33 again. On one side of the placement cavity 11, there is a clamping groove, which is arranged corresponding to the clamping block 32. When the clamping block 32 matches the clamping groove, it can be pushed into the clamping groove under the action of the fixing spring 34, so that the slider 3 cannot move downward. When the slider 3 moves upward under the action of the cam 7, the arc surface of the uppermost clamping block 32 is squeezed by the inner wall of the clamping groove and is pressed back into the corresponding counterbore 33. At the same time, the lower clamping block 32 moves upward until it matches the clamping groove, so as to realize the continuous upward movement of the slider 3 until the lowermost clamping block 32 enters the clamping groove.

[0031] On both sides of the inner wall of the placement cavity 11, there are sliding grooves 112. The two sliding grooves 112 jointly slidably connect a pressing plate 113. One end of the pressing plate 113 is fixedly connected with an extension rod 114. The extension rod 114 passes through the placement cavity 11 and is slidably connected with the switch cabinet body 1. A pressing spring 115 is fixedly connected between the upper side of the pressing plate 113 and the top of the placement cavity 11. In the initial state, the pressing spring 115 will pull the pressing plate 113, so that the pressing plate 113 will not block the clamping groove. By pressing the extension rod 114, the extension rod 114 drives the pressing plate 13 to slide in the sliding groove 112 and stretches the pressing spring 115. When the pressing plate 13 moves downward, it abuts against the clamping block 32 in the clamping groove and exerts extrusion on the arc surface of the clamping block 32, thereby squeezing the clamping block 32 back into the counterbore 33. At this time, the slider 3 is no longer fixed, and thus slides back into the warning cavity 12 under its own gravity. The baffle 122 covers the through groove 121 again under the action of the torsion spring for folding.

[0032] A first sunken groove is provided on the lower side of the placement plate 2. A permanent magnet 23 is fixedly connected in the first sunken groove. The permanent magnet 23 can attract the cam 7 to prevent the first outer shaft 42 and the second outer shaft 43 from rotating when the inner shaft 41 rotates under normal circumstances. Two first avoidance grooves 116 are provided on the bottom surface of the placement cavity 11. The first avoidance grooves 116 are arranged in one-to-one correspondence with the cams 7. The drive shaft 4 includes an inner shaft 41. One side of the inner wall of the drive cavity 14 is fixedly connected with a motor 141. The end of the main shaft of the motor 141 is fixedly connected with one end of the inner shaft 41. The other end of the inner shaft 41 is rotatably connected with the other side of the inner wall of the drive cavity 14. The first outer shaft 42 and the second outer shaft 43 are rotatably connected to the outside of the inner shaft 41. Two cams 7 are respectively coaxially fixedly connected with the first outer shaft 42 and the second outer shaft 43. A through hole is provided in the middle of the worm 6. The first outer shaft 42 and the second outer shaft 43 are both rotatably connected to the through hole. A plurality of connecting blocks 411 are fixedly connected between the outer wall of the inner shaft 41 and the inner wall of the through hole. In the initial state, the first outer shaft 42 and the second outer shaft 43 do not rotate together with the inner shaft 41. When the motor 141 is started, the motor 141 drives the inner shaft 41 to rotate. The inner shaft 41 drives the worm 6 to rotate through the connecting blocks 411. The worm 6 then drives the worm wheel 51 and the rotating shaft 5 to rotate together. The rotation of the rotating shaft 5 drives the fan blade 52 to rotate to generate air flow. When there is water accumulation inside the placement cavity 11, the first outer shaft 42 and the second outer shaft 43 rotate together with the inner shaft 41. The inner shaft 41 drives the first outer shaft 42 and the second outer shaft 43 to rotate together, thereby driving the two cams 7 to rotate. At this time, the rotation direction of the cam 7 contacts the arc surface of the latch 32. The slider 3 does not move, only lifting the placement plate 2 to drain the accumulated water from the drain pipe 22 at the bottom of the placement groove 21. When the temperature inside the placement cavity 11 is too high, the first outer shaft 42 and the second outer shaft 43 rotate together with the inner shaft 41. The motor 141 is started to reverse. The inner shaft 41 drives the first outer shaft 42 and the second outer shaft 43 to rotate together, thereby driving the two cams 7 to rotate. At this time, the rotation direction of the cam 7 contacts the right-angle surface of the latch 32, thereby lifting the slider 3.

[0033] On one side of the first outer shaft 42, there is a first annular groove 421. A sleeve 422 is slidably connected in the first annular groove 421. On one side of the sleeve 422, a plurality of fixing rods 423 are fixedly connected. The fixing rods 423 pass through the bottom of the first annular groove 421 and are fixedly connected with a fixing ring 424. Between one side of the sleeve 422 and the bottom of the first annular groove 421, a plurality of limiting springs 425 are fixedly connected. On one side of the inner wall of the driving cavity 14, an annular electromagnet 142 is fixedly connected. The electromagnet 142 is arranged corresponding to the fixing ring 424. On one side of the second outer shaft 43, there is a second annular groove 431. The second annular groove 431 is arranged corresponding to the sleeve 422. On the outer side of the sleeve 422, a plurality of splines 426 are fixedly connected. On the inner wall of the first annular groove 421, there are a plurality of first key grooves. On the inner wall of the second annular groove 431, there are a plurality of second key grooves. The first key grooves and the second key grooves are both arranged corresponding to the splines 426 and are slidably connected. On one side of the sleeve 426, there are a plurality of fixing grooves 427. The fixing grooves 427 are arranged corresponding to the connecting blocks 411 one by one. When the electromagnet 142 attracts the fixing ring 424, the sleeve 422 is located in the first annular groove 421 and will not affect the connecting blocks 411. At this time, neither the first outer shaft 42 nor the second outer shaft 43 rotates following the inner shaft 41. When the electromagnet 142 releases the fixing ring 424, the sleeve 422 is pushed into the second annular groove 431 under the action of the limiting spring 425, and the fixing grooves 427 match with the connecting blocks 411, so that the connecting blocks 411 abut against the inner walls of the fixing grooves 427. At the same time, the first key grooves and the second key grooves both match with the splines 426. At this time, when the inner shaft 41 rotates, it can drive the sleeve 422 to rotate together through the connecting blocks 411. The sleeve 422 then drives the first outer shaft 42 and the second outer shaft 43 to rotate together through the splines 426, the first key grooves and the second key grooves, so that the inner shaft 41 can drive the first outer shaft 42 and the second outer shaft 43 to rotate together. Embodiment 2

[0034] As Figures 1-6 shown, the present invention also provides a protection method for an intelligent protection device of a ring network switchgear. The protection method is as follows:

[0035] a. During normal use, the cam 7 matches with the permanent magnet 23, the electromagnet 142 attracts the fixing ring 424, and the first outer shaft 42 and the second outer shaft 43 do not rotate together following the inner shaft 41. At this time, the motor 141 is started, the motor 141 drives the inner shaft 41 and the worm 6 to rotate together, the worm 6 drives the worm wheel 51 and the rotating shaft 5 to rotate together, and the rotating shaft 5 drives the fan blade 52 to rotate to generate air flow, which enters the placement cavity 11 through the air exchange pipe 131 for heat dissipation;

[0036] b. When there is accumulated water in the placement cavity 11, the electromagnet 142 releases the fixing ring 424, and the sleeve 422 enters from the first annular groove 421 into the second annular groove 431. At this time, the first outer shaft 42 and the second outer shaft 43 rotate together with the inner shaft 41. The first outer shaft 42 and the second outer shaft 43 drive the cam 7 to rotate together. The cam 7 jacks up one side of the placement plate 2, so that the accumulated water is discharged from the drain pipe 22.

[0037] c. When the temperature in the placement cavity 11 is too high, the electromagnet 142 releases the fixing ring 424. At the same time, the motor 141 rotates in the reverse direction, and the cam 7 rotates in the reverse direction to jack up the slider 3. The slider 3 then ejects the warning sign 31 out of the warning cavity 12 for warning the user.

[0038] During use, under normal conditions, the cam 7 matches the permanent magnet 23, the electromagnet 142 attracts the fixing ring 424, and the first outer shaft 42 and the second outer shaft 43 do not rotate together with the inner shaft 41. At this time, the motor 141 is started. The motor 141 drives the inner shaft 41 and the worm 6 to rotate together. The worm 6 drives the worm gear 51 and the rotating shaft 5 to rotate together. The rotating shaft 5 drives the fan blade 52 to rotate to generate air flow, which enters the placement cavity 11 through the air exchange pipe 131 for heat dissipation. When there is accumulated water in the placement cavity 11, the electromagnet 142 releases the fixing ring 424, and the sleeve 422 enters from the first annular groove 421 into the second annular groove 431. At this time, the first outer shaft 42 and the second outer shaft 43 rotate together with the inner shaft 41. The first outer shaft 42 and the second outer shaft 43 drive the cam 7 to rotate together. The cam 7 jacks up one side of the placement plate 2, so that the accumulated water is discharged from the drain pipe 22. When the temperature in the placement cavity 11 is too high, the electromagnet 142 releases the fixing ring 424. At the same time, the motor 141 rotates in the reverse direction, and the cam 7 rotates in the reverse direction to jack up the slider 3. The slider 3 then ejects the warning sign 31 out of the warning cavity 12 for warning the user.

[0039] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An intelligent protection device for a ring main unit switchgear, comprising a switchgear body (1), characterized in that: Inside the switch cabinet body (1), there is a placement cavity (11). On one side of the placement cavity (11), there is a warning cavity (12). On the other side of the placement cavity (11), there is an exchange cavity (13). Below the placement cavity (11), there is a drive cavity (14). At the top of the placement cavity (11), a controller (111) is fixedly connected. At the bottom of the placement cavity (11), a placement plate (2) is rotatably connected. On one side of the placement plate (2), there is a drainage groove (21). At the bottom of the drainage groove (21), a drain pipe (22) is fixedly connected. Inside the warning cavity (12), a slider (3) is slidably connected. At the top of the slider (3), a warning sign (31) is fixedly connected. On one side of the slider (3), there are several clamping blocks (32). Inside the exchange cavity (13), there is an air exchange pipe (131). The drain pipe (22) passes through both sides of the exchange cavity (13) and is fixedly connected to the switch cabinet body (1). Inside the drive cavity (14), a drive shaft (4) and a rotating shaft (5) are rotatably connected. On the outer side of the drive shaft (4), there is a worm (6) and two cams (7). On the outer side of the rotating shaft (5), a worm gear (51) and several fan blades (52) are fixedly connected. The worm gear (51) meshes with the worm (6).

2. The intelligent protection device for a ring main unit switchgear according to claim 1, characterized in that: On one side of the placement cavity (11), there is a clamping groove, which is arranged corresponding to the clamping block (32). On both sides of the inner wall of the placement cavity (11), there are sliding grooves (112). The two sliding grooves (112) jointly slidably connect a pressing plate (113). One end of the pressing plate (113) is fixedly connected to an extension rod (114). The extension rod (114) passes through the placement cavity (11) and is slidably connected to the switch cabinet body (1). Between the upper side of the pressing plate (113) and the top of the placement cavity (11), a pressing spring (115) is fixedly connected.

3. An intelligent protection device for a ring main unit switchgear according to claim 1, characterized in that: Below the placement plate (2), there is a first sunk groove, and a permanent magnet (23) is fixedly connected inside the first sunk groove. On the bottom surface of the placement cavity (11), there are two first avoidance grooves (116), which are arranged corresponding to the cams (7) one by one.

4. An intelligent protection device for a ring main unit switchgear according to claim 1, characterized in that: On one side of the slider (3), there are several sunk holes (33), which are arranged corresponding to the clamping blocks (32) and slidably connected. Between the bottom of the clamping block (32) and the bottom of the sunk hole (33), a fixing spring (34) is fixedly connected. On one side of the placement cavity (11), there is a second avoidance groove (117), which is arranged corresponding to the clamping block (32).

5. An intelligent protection device for a ring main unit switchgear according to claim 1, characterized in that: At the top of the warning cavity (12), there is a through groove (121). Inside the through groove (121), a baffle (122) is rotatably connected. Below the baffle (122), there is a limiting plate (123), and the limiting plate (123) is fixedly connected to the inner wall of the through groove (121).

6. An intelligent protection device for a ring main unit switchgear according to claim 1, characterized in that: The drive shaft (4) includes an inner shaft (41). One side of the inner wall of the drive cavity (14) is fixedly connected with a motor (141). The end of the main shaft of the motor (141) is fixedly connected with one end of the inner shaft (41). The other end of the inner shaft (41) is rotatably connected with the other side of the inner wall of the drive cavity (14). A first outer shaft (42) and a second outer shaft (43) are rotatably connected to the outside of the inner shaft (41). The two cams (7) are respectively coaxially fixedly connected with the first outer shaft (42) and the second outer shaft (43). A through hole is provided in the middle of the worm (6). The first outer shaft (42) and the second outer shaft (43) are both rotatably connected with the through hole. A plurality of connecting blocks (411) are fixedly connected between the outer wall of the inner shaft (41) and the inner wall of the through hole.

7. An intelligent protection device for a ring main unit switchgear according to claim 6, characterized in that: A first annular groove (421) is provided on one side of the first outer shaft (42). A sleeve (422) is slidably connected in the first annular groove (421). A plurality of fixing rods (423) are fixedly connected to one side of the sleeve (422). The fixing rods (423) pass through the bottom of the first annular groove (421) and are fixedly connected with a fixing ring (424). A plurality of limiting springs (425) are fixedly connected between one side of the sleeve (422) and the bottom of the first annular groove (421). An annular electromagnet (142) is fixedly connected to one side of the inner wall of the drive cavity (14). The electromagnet (142) is arranged corresponding to the fixing ring (424).

8. An intelligent protection device for a ring main unit switchgear according to claim 7, characterized in that: A second annular groove (431) is provided on one side of the second outer shaft (43). The second annular groove (431) is arranged corresponding to the sleeve (422). A plurality of splines (426) are fixedly connected to the outside of the sleeve (422). A plurality of first key grooves are provided on the inner wall of the first annular groove (421). A plurality of second key grooves are provided on the inner wall of the second annular groove (431). The first key grooves and the second key grooves are both arranged corresponding to the splines (426) and are slidably connected. A plurality of fixing grooves (427) are provided on one side of the sleeve (422). The fixing grooves (427) are arranged corresponding to the connecting blocks (411) one by one.

9. A protection method for an intelligent protection device of a ring main unit switchgear, characterized in that, The protection method is as follows: a. During normal use, the cam (7) is matched with the permanent magnet (23). The electromagnet (142) attracts the fixing ring (424). The first outer shaft (42) and the second outer shaft (43) do not rotate together with the inner shaft (41). At this time, the motor (141) is started. The motor (141) drives the inner shaft (41) and the worm (6) to rotate together. The worm (6) drives the worm wheel (51) and the rotating shaft (5) to rotate together. The rotating shaft (5) drives the fan blade (52) to rotate to generate air flow, which enters the placement cavity (11) through the air exchange pipe (131) for heat dissipation; b. When there is accumulated water in the placement cavity (11), the electromagnet (142) releases the fixing ring (424), and the sleeve (426) enters from the first annular groove (421) into the second annular groove (431). At this time, the first outer shaft (42) and the second outer shaft (43) rotate together with the inner shaft (41). The first outer shaft (42) and the second outer shaft (43) drive the cam (7) to rotate together, and the cam (7) lifts one side of the placement plate (2), so that the accumulated water is discharged from the drain pipe (22). c. When the temperature in the placement cavity (11) is too high, the electromagnet (142) releases the fixing ring (424), and at the same time the motor (141) rotates in the reverse direction. The cam (7) rotates in the reverse direction to lift the slider (3), and the slider (3) then pushes out the warning sign (31) from the warning cavity (12) to warn the user.

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