Protective device of solid-state motor starter

Abstract

The invention relates to the technical field of protection devices, and discloses a protection device of a solid-state motor starter, which comprises a protection cabinet, a starter body fixedly mounted in the protection cabinet, a heat dissipation and dust removal assembly fixedly mounted at the bottom of the inner side of the protection cabinet, and a moisture removal assembly movably connected to the top of the heat dissipation and dust removal assembly, a splayed spoiler is fixedly arranged in an air channel groove, air conveyed by cooling fans in the air channel is guided, cold air conveyed by the cooling fans is effectively guided into the protection cabinet, and meanwhile the situation that convection is formed by the air conveyed by the cooling fans on the two sides is avoided; when the cooling fan works, air flowing at a high speed at the air duct enables the dust removal hole to form a negative pressure state, the dust stirring plate on the dust removal ring is beneficially subjected to wind resistance generated by air inflow, the generated resistance forces the dust removal ring to rotate in the sliding groove in the dust removal hole, dust removal is carried out on the air duct, dust is prevented from being accumulated at the air inlet, and the cooling effect is prevented from being reduced.

Description

Technical Field

[0001] The invention relates to the technical field of protective devices, in particular to a protective device for a solid-state motor starter. Background Art

[0002] Solid-state motor starter is a new type of medium and high voltage motor soft starter, mainly suitable for medium and high voltage AC motors below 10kv. It is a fully digital intelligent starting device designed by combining electronic power technology, optoelectronic control technology and microprocessing technology.

[0003] At present, during the use of solid-state motor starters, when the fan is cooling the starter, dust particles in the air are easily followed by the airflow into the interior of the starter, resulting in a large amount of dust accumulation at the air inlet, which requires regular manual cleaning. At the same time, when the air inlet is blocked by dust, the air intake volume is reduced, making it impossible for the starter to dissipate heat normally, which can easily cause the thyristor to be damaged due to excessively high temperature. In the rainy season or in the early morning of winter, the surrounding environment is too humid or prone to condensation. During use, water vapor is easily caused to enter the interior of the starter, resulting in short circuit and burning due to leakage. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the present invention provides a protective device for a solid-state motor starter, which solves the problems raised in the above-mentioned background technology.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: A protective device for a solid-state motor starter, comprising:

[0008] A protective cabinet, wherein a starter body is fixedly installed inside the protective cabinet;

[0009] The heat dissipation and dust removal component is fixedly installed on the inner bottom of the protective cabinet to cool the starter body inside the protective cabinet and prevent dust from accumulating inside the protective cabinet to affect heat dissipation;

[0010] The dehumidification component is movably connected to the top of the heat dissipation and dust cleaning component and is used to detect the air humidity and perform drying treatment.

[0011] Air inlets are provided at the bottom of both sides of the protective cabinet, and air outlets are provided at the top of both sides of the protective cabinet.

[0012] The heat dissipation and dust cleaning component includes a heat dissipation frame fixedly connected to the bottom inner side of the protective cabinet, the top of the heat dissipation frame is provided with an air duct groove, an eight-shaped spoiler is fixedly placed inside the air duct groove, the top of the air duct groove is provided with engaging holes on both sides of the top near the air inlet, the heat dissipation frame is provided with air ducts on both sides near the air inlet, the inner wall of the air duct is fixedly connected with a heat dissipation fan, and both sides of the heat dissipation frame are fixedly connected with dust cleaning plates, the dust cleaning holes are provided on the dust cleaning plates corresponding to the positions of the air ducts, a slide groove is provided on the inner side of the dust cleaning hole, a dust removal ring is movably connected to the slide groove, a dust removal plate is fixedly connected to the middle part of the dust removal ring, and a dust removal plate is fixedly connected to a side of the dust removal plate close to the air duct with equidistantly arranged dust removal blocks.

[0013] The dehumidification assembly includes a fixing strip fixedly connected to the top of the figure-eight spoiler, a groove is provided on the top of the fixing strip near the back plate of the protective cabinet, a rotating column is fixedly connected to the middle of the groove, an electric telescopic rod is fixedly connected to the inside of the groove, a controller is fixedly connected to one end of the upper surface of the fixing strip away from the groove, embedding holes and embedding recesses are provided on both sides of the fixing strip near the air duct, a dehumidification frame is movably connected to the embedding hole, a humidity sensor is fixedly installed on the bottom of the dehumidification frame, a drying plate is fixedly connected to the middle of the dehumidification frame, a movable column is fixedly connected to the top of the dehumidification frame near the fixing strip, a follow-up rod is movably connected to the movable column, an end of the follow-up rod near the back plate of the protective cabinet is fixedly connected to a follow-up block, an end of the follow-up block away from the follow-up rod is movably connected to a lifting rod, and a rotating hole is provided on the side of the lifting rod near the bottom.

[0014] The dust removing ring is rotatably connected with the dust cleaning plate by being embedded in the sliding groove inside the dust cleaning hole. There are four groups of dust removing plates in total. The dust removing plates are inclined and fixedly connected to the middle of the dust removing ring at equal intervals.

[0015] The lifting rod is sleeved on the rotating column in the middle of the groove through a rotating hole and is rotatably connected to the fixing bar, and the bottom of the lifting rod is movably connected to the top of the electric telescopic rod. The humidity sensor is electrically connected to the controller and the electric telescopic rod through a line.

[0016] The middle of the drying plate is fixedly connected with water absorbing strips at equal intervals, and the drying plate is fixedly connected with the dehumidification frame by embedding.

[0017] A filter screen is fixedly connected in the interlayer between the dust cleaning plate and the air duct, and the shifting block on the side of the dust shifting plate is in contact with the filter screen.

[0018] (III) Beneficial effects

[0019] The protective device for a solid-state motor starter provided by the present invention has the following beneficial effects:

[0020] 1. A protective device for a solid-state motor starter guides the air delivered by the cooling fan in the air duct by fixing an eight-shaped spoiler inside a groove of the air duct, effectively guiding the cold air delivered by the cooling fan to the inside of the protective cabinet, cooling the starter body, and avoiding convection of the air delivered by the cooling fans on both sides. By arranging the dust-flicking plate to be inclined, when the cooling fan is working, the cooling fan accelerates the air flow in the air duct, so that a negative pressure state is formed at the dust cleaning hole, which is beneficial for the dust-flicking plate on the dust-removing ring to be subjected to the wind resistance generated by the air intake. The generated resistance forces the dust-removing ring to rotate in the slide groove on the dust-removing hole, so as to clean the air duct and prevent dust from accumulating at the air inlet, thereby reducing the heat dissipation effect.

[0021] 2. This kind of protective device for solid-state motor starter has equidistantly arranged shifting blocks fixedly connected to one side of the dust-moving plate close to the air duct. The shifting blocks are fitted with the filter screen to facilitate the rotation of the dust-moving ring. When the dust-moving plate is moved to clean the dust accumulated on the filter screen due to filtration, the shifting blocks will be moved on the mesh opening of the filter screen to vibrate the filter screen, which is conducive to the rapid falling of dust on the filter screen, prevents dust from accumulating on the filter screen, and avoids the staff from performing manual cleaning from time to time.

[0022] 3. The protective device of the solid-state motor starter is provided with a dehumidification frame movably connected to both sides of the fixed strip. When the dehumidification frame is erected, it is used in conjunction with an eight-shaped spoiler. The eight-shaped spoiler guides the high-speed air flowing in the air duct groove upward, while the erected dehumidification frame diverts the air, so that the air enters the protective cabinet evenly, so that the air delivered by the cooling fan achieves the best heat dissipation effect. When the dehumidification frame is laid flat on the air duct groove, the water-absorbing strip on the drying plate dries the flowing air, thereby avoiding accidents of leakage and short circuit of the starter body. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the heat dissipation and dust cleaning component of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the dust cleaning plate of the present invention;

[0026] Figure 4 for Figure 3 The structural diagram of A in the figure;

[0027] Figure 5 It is a schematic diagram of the cross-sectional structure of the heat dissipation frame of the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the moisture removal component of the present invention;

[0029] Figure 7 This is a closed schematic diagram of the dehumidification frame structure of the present invention;

[0030] Figure 8 This is a schematic diagram of the dehumidification frame structure of the present invention;

[0031] Fig. 9 for Figure 7 Schematic diagram of the enlarged structure of B.

[0032] In the figure: 1. protective cabinet; 2. starter body; 3. heat dissipation and dust cleaning component; 4. dehumidification component; 5. air inlet; 6. air outlet; 7. heat dissipation frame; 8. air duct groove; 9. figure eight spoiler; 10. air duct; 11. cooling fan; 12. dust cleaning plate; 13. dust cleaning hole; 14. slide; 15. dust removal ring; 16. dust removal plate; 17. fixing bar; 18. electric telescopic rod; 19. embedded recess; 20. dehumidification frame; 21. drying plate; 22. follower rod; 23. follower block; 24. lifting rod; 25. water absorption strip; 26. filter screen; 27. shifting block; 28. humidity sensor. DETAILED DESCRIPTION

[0033] 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.

[0034] Embodiment 1

[0035] refer to Figures 1 to 4 A protective device for a solid-state motor starter according to a preferred embodiment of the present invention will be described in detail below: comprising:

[0036] A protective cabinet 1, wherein a starter body 2 is fixedly installed inside the protective cabinet 1;

[0037] The heat dissipation and dust removal component 3 is fixedly mounted on the inner bottom of the protective cabinet 1 and is used to perform air cooling on the starter body 2 inside the protective cabinet 1 and prevent dust from accumulating inside the protective cabinet 1 to affect heat dissipation;

[0038] The dehumidification component 4 is movably connected to the top of the heat dissipation and dust removal component 3, and is used for detecting the air humidity and performing drying treatment.

[0039] Air inlets 5 are provided at the bottom of both sides of the protection cabinet 1 , and air outlets 6 are provided at the top of both sides of the protection cabinet 1 .

[0040] By utilizing the principle that the density of cold air is greater than that of hot air, air inlets 5 are opened at the bottom of both sides of the protective cabinet 1 and air outlets 6 are opened at the top of both sides of the protective cabinet 1, so that the cold air below can enter the protective cabinet 1 for heat dissipation, and the hot air inside the protective cabinet 1 can be quickly discharged from the air outlet 6 on the top.

[0041] The heat dissipation and dust cleaning component 3 includes a heat dissipation frame 7 fixedly connected to the bottom inner side of the protective cabinet 1, a duct groove 8 is provided on the top of the heat dissipation frame 7, an eight-shaped spoiler 9 is fixedly placed inside the duct groove 8, the duct groove 8 is provided with embedding holes on the top of both sides near the air inlet 5, the heat dissipation frame 7 is provided with air ducts 10 on both sides near the air inlet 5, a heat dissipation fan 11 is fixedly connected to the inner wall of the air duct 10, and cleaning plates 12 are fixedly connected on both sides of the heat dissipation frame 7, cleaning holes 13 are provided on the cleaning plate 12 at positions corresponding to the positions of the air duct 10, a slide groove 14 is provided on the inner side of the cleaning hole 13, a dust removal ring 15 is movably connected to the slide groove 14, a dust removal plate 16 is fixedly connected to the middle of the dust removal ring 15, and a dust removal plate 27 arranged equidistantly is fixedly connected to the dust removal plate 16 on the side close to the air duct 10.

[0042] By fixing the figure-eight spoiler 9 inside the air duct groove 8, the air delivered by the cooling fan 11 in the air duct 10 is guided, and the cold air delivered by the cooling fan 11 is effectively guided to the inside of the protective cabinet 1, and the starter body 2 is cooled by air. At the same time, convection of the air delivered by the cooling fans 11 on both sides is avoided. By providing a slide groove 14 on the inner side of the cleaning hole 13, the dust removal ring 15 is convenient to rotate on the slide groove 14, which is conducive to the dust cleaning process while the dust removal plate 16 rotates.

[0043] The dust removal ring 15 is movably connected to the dust cleaning plate 12 by being embedded in the slide groove 14 inside the dust cleaning hole 13. There are four groups of dust removal plates 16 in total. The dust removal plates 16 are inclined and fixedly connected to the middle of the dust removal ring 15 at equal distances.

[0044] By setting the dust-flicking plate 16 to be inclined, when the cooling fan 11 is working, the cooling fan 11 accelerates the air flow in the air duct 10. When the external airflow passes through the cleaning hole 13 and enters the air duct 10, it is resisted by the dust-flicking plate 16, so that a negative pressure state is formed in the cleaning hole 13. This is beneficial for the dust-flicking plate 16 on the dust-removing ring 15 to be resisted by the wind resistance generated by the intake air, forcing the dust-removing ring 15 to rotate in the slide groove 14 on the dust-removing hole 13, thereby cleaning the air duct 10 and preventing dust from accumulating at the air inlet 5 to reduce the heat dissipation effect.

[0045] A filter screen 26 is fixedly connected in the interlayer between the dust cleaning plate 12 and the air duct 10 , and a shifting block 27 on the side of the dust shifting plate 16 is in contact with the filter screen 26 .

[0046] The air is filtered by fixing and pasting the filter 26 in the interlayer between the dust cleaning plate 12 and the air duct 10 to prevent dust from accumulating on the starter body 2 inside the protective cabinet 1; the paddle block 27 on the side of the dust paddle plate 16 is fitted with the filter 26, so that when the dust removal ring 15 is rotating, the dust paddle plate 16 is moved to clean the dust accumulated on the filter 26 due to filtration, and the paddle block 27 will be moved on the mesh opening of the filter 26, causing the filter 26 to vibrate. During the vibration of the filter 26, the dust on the filter 26 that cannot be cleaned by the dust paddle plate 16 can be quickly dropped off, thereby avoiding the staff from manually cleaning the surface of the filter 26 from time to time.

[0047] The following is the entire working process and working principle of the above embodiment:

[0048] When the starter body 2 is in use, the heat dissipation fan 11 on the heat dissipation and dust cleaning component 3 will automatically start with the use of the starter body 2. As the heat dissipation fan 11 rotates, the air in the air duct 10 is accelerated to flow into the air duct groove 8. The eight-shaped spoiler 9 fixedly placed inside the air duct groove 8 can guide the air delivered by the heat dissipation fan 11 in the air duct 10, effectively guide the cold air delivered by the heat dissipation fan 11 to the inside of the protective cabinet 1, and perform air cooling and heat dissipation on the starter body 2 to prevent the components on the starter body 2 from being damaged by high temperature. At the same time, the air delivered by the heat dissipation fans 11 on both sides is prevented from forming convection. Since the air outlets 6 are opened at the tops of both sides of the protective cabinet 1, when the eight-shaped spoiler 9 guides the cold air delivered by the heat dissipation fan 11 to the inside of the protective cabinet 1, the hot air inside the protective cabinet 1 is quickly discharged from the air outlet 6 on the top;

[0049] While the cooling fan 11 dissipates heat for the starter body 2, the filter 26 in the interlayer between the dust cleaning plate 12 and the air duct 10 filters the dust particles in the air to prevent the dust particles from accumulating on the starter body 2 inside the protective cabinet 1 and causing leakage and short circuit accidents. Since the cooling fan 11 accelerates the air flow in the air duct 10, a negative pressure state is formed at the dust cleaning hole 13 on one side of the air duct 10, and then the dust cleaning plate 16 fixedly connected to the dust cleaning ring 15 at an angle is subject to the wind resistance caused by the intake air. Since the dust cleaning plate 16 is fixedly connected to the dust cleaning ring 15 at an angle, that is, when the air flowing at the air inlet 5 passes through the dust cleaning plate 16, the air on one side of the dust cleaning plate 16 moves in a straight line, while the airflow on the other side moves in an oblique line along the inclined surface of the dust cleaning plate 16. Under the same time conditions The velocity of the airflow passing through the inclined surface of the ash-flicking plate 16 is faster than that of the airflow not passing through the ash-flicking plate 16. According to Bernoulli's theorem, the air pressure at a high velocity will decrease. Therefore, the resistance generated forces the ash-removing ring 15 to rotate in the slide groove 14 on the ash-cleaning hole 13. Since the paddle block 27 on the side of the ash-flicking plate 16 is in contact with the filter screen 26, when the ash-removing ring 15 rotates, the ash-flicking plate 16 moves to clean the dust accumulated on the filter screen 26 due to filtration. At the same time, the paddle block 27 moves on the mesh opening of the filter screen 26, causing the filter screen 26 to vibrate. When the filter screen 26 vibrates, it is beneficial for the dust on the mesh opening of the filter screen 26 that cannot be cleaned by the ash-flicking plate 16 to be quickly shaken off, thereby preventing the accumulation of dust on the filter screen 26 and avoiding the situation where the staff manually cleans the surface of the filter screen 26 from time to time.

[0050] Embodiment 2

[0051] refer to Figures 5 to 9 The dehumidification component 4 includes a fixing bar 17 fixedly connected to the top of the eight-shaped spoiler 9, a groove is provided on the top of the fixing bar 17 near the back plate of the protective cabinet 1, a rotating column is fixedly connected to the middle of the groove, an electric telescopic rod 18 is fixedly connected to the inside of the groove, and a controller is fixedly connected to the end of the upper surface of the fixing bar 17 away from the groove, and both sides of the fixing bar 17 near the air duct 10 are provided with embedding holes and embedding recesses 19, a dehumidification frame 20 is movably connected to the embedding hole, a humidity sensor 28 is fixedly installed at the bottom of the dehumidification frame 20, a drying plate 21 is fixedly connected to the middle of the dehumidification frame 20, a movable column is fixedly connected to the top of the side of the dehumidification frame 20 near the fixing bar 17, a follower rod 22 is movably connected to the movable column, and a follower block 23 is fixedly connected to one end of the follower block 23 near the back plate of the protective cabinet 1, and a lifting rod 24 is movably connected to one end of the follower block 23 away from the follower rod 22, and a rotating hole is provided on the side of the lifting rod 24 near the bottom.

[0052] A dehumidification frame 20 is movably connected to both sides of the fixing strip 17. When the dehumidification frame 20 is erected, it is used in conjunction with the figure-eight spoiler 9. While the figure-eight spoiler 9 guides the high-speed air flowing in the air duct groove 8 upward, the erected dehumidification frame 20 diverts the air, so that the air enters the protective cabinet 1 evenly, so that the air delivered by the cooling fan 11 achieves the best cooling effect.

[0053] The lifting rod 24 is rotatably connected to the fixing bar 17 by being sleeved on the rotating column in the middle of the groove through the rotating hole, and the bottom of the lifting rod 24 is movably connected to the top of the electric telescopic rod 18, and the humidity sensor 28 is electrically connected to the controller and the electric telescopic rod 18 through the line.

[0054] The humidity in the air is detected by the humidity sensor 28. When the air humidity is too high, the controller receives the detection data of the humidity sensor 28 and controls the telescopic tube on the electric telescopic rod 18 to retract, driving the lifting rod 24 to tilt and fall in the groove. At the same time, the follower rod 22 movably connected to the lifting rod 24 is driven by the tilted lifting rod 24 to tilt and fall toward the side of the back plate of the protective cabinet 1, thereby rotating the dehumidification frame 20 to dry the flowing air.

[0055] The middle of the drying plate 21 is fixedly connected with water absorbing strips 25 at equal intervals, and the drying plate 21 is fixedly connected to the dehumidification frame 20 by embedding.

[0056] The equidistant arrangement of the water absorption strips 25 can absorb moisture in the air while avoiding blocking the air duct groove 8. By embedding the drying plate 21 into the dehumidification frame 20, it is convenient to disassemble and replace the water absorption strips 25 when the moisture in the water absorption strips 25 is saturated with dry air.

[0057] The following is the entire working process and working principle of the above embodiment:

[0058] When the dehumidification component 4 is working normally, the dehumidification frame 20 movably connected on both sides of the fixing bar 17 is in an upright state, and is used in conjunction with the eight-shaped spoiler 9. While the eight-shaped spoiler 9 guides the high-speed air flowing in the air duct groove 8 upward, the upright dehumidification frame 20 diverts the air, so that the air enters the protective cabinet 1 evenly, so that the air delivered by the cooling fan 11 achieves the best heat dissipation effect. When the surrounding environment is too humid when the starter body 2 is in use, the humidity sensor 28 at the bottom of the dehumidification frame 20 will detect the humidity in the air. When the air humidity is too high, the telescopic tube on the electric telescopic rod 18 retracts, driving the lifting rod 24 in the groove. It falls down at an angle, and the follower rod 22 movably connected to the lifting rod 24 is driven by the lifting rod 24 to fall down toward the side of the back plate of the protective cabinet 1, so that the follower rod 22 falls into the embedded recesses 19 on both sides of the upper surface of the fixing bar 17, and then the dehumidification frame 20 is rotated and laid flat on the air duct groove 8, so that the drying plate 21 dries the flowing air to avoid leakage and short circuit accidents of the starter body 2. The equidistant arrangement of the water absorption strips 25 can absorb moisture in the air while avoiding blocking the air duct groove 8. By embedding the drying plate 21 in the dehumidification frame 20, the water in the water absorption strip 25 can be disassembled and replaced when it is saturated.

[0059] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A protective device for a solid-state motor starter, characterized in that: include: A protective cabinet (1), wherein a starter body (2) is fixedly installed inside the protective cabinet (1); A heat dissipation and dust removal component (3) is fixedly mounted on the inner bottom of the protective cabinet (1) and is used to perform air cooling on the starter body (2) inside the protective cabinet (1) and prevent dust from accumulating inside the protective cabinet (1) and affecting heat dissipation; The dehumidification component (4) is movably connected to the top of the heat dissipation and dust removal component (3) and is used to detect the air humidity and perform drying treatment.

2. The protective device for a solid-state motor starter according to claim 1, characterized in that: Air inlets (5) are provided at the bottom of both sides of the protection cabinet (1), and air outlets (6) are provided at the top of both sides of the protection cabinet (1).

3. The protective device for a solid-state motor starter according to claim 1, characterized in that: The heat dissipation and dust removal component (3) comprises a heat dissipation frame (7) fixedly connected to the bottom of the inner side of the protection cabinet (1), the top of the heat dissipation frame (7) is provided with an air duct groove (8), an eight-shaped spoiler (9) is fixedly placed inside the air duct groove (8), the top of the two sides of the air duct groove (8) near the air inlet (5) are provided with embedded holes, the heat dissipation frame (7) is provided with air ducts (10) on both sides near the air inlet (5), and the inner wall of the air duct (10) is fixedly connected with a heat dissipation fan (11). 1), both sides of the heat dissipation frame (7) are fixedly connected with dust cleaning plates (12), the dust cleaning plates (12) are provided with dust cleaning holes (13) at positions corresponding to the positions of the air duct (10), the inner sides of the dust cleaning holes (13) are provided with slide grooves (14), the slide grooves (14) are movably connected with dust removal rings (15), the middle part of the dust removal ring (15) is fixedly connected with dust removal plates (16), and the dust removal plates (16) are fixedly connected with equidistantly arranged shifting blocks (27) on one side close to the air duct (10).

4. The protective device for a solid-state motor starter according to claim 3, characterized in that: The dehumidification component (4) comprises a fixing strip (17) fixedly connected to the top of the figure-eight spoiler (9); a groove is provided on the top of the fixing strip (17) near the back plate of the protective cabinet (1); a rotating column is fixedly connected to the middle of the groove; an electric telescopic rod (18) is fixedly connected inside the groove; a controller is fixedly connected to the end of the upper surface of the fixing strip (17) away from the groove; both sides of the fixing strip (17) near the air duct (10) are provided with an embedding hole and an embedding recess (19); a dehumidification frame (20) is movably connected to the embedding hole; and the dehumidification frame (20) A humidity sensor (28) is fixedly installed at the bottom, a drying plate (21) is fixedly connected to the middle of the dehumidification frame (20), a movable column is fixedly connected to the top of the side of the dehumidification frame (20) close to the fixed bar (17), an end of the movable column away from the dehumidification frame (20) is movably connected to a follower rod (22), an end of the follower rod (22) close to the back plate of the protection cabinet (1) is fixedly connected to a follower block (23), an end of the follower block (23) away from the follower rod (22) is movably connected to a lifting rod (24), and a rotating hole is opened on the side of the lifting rod (24) close to the bottom.

5. The protective device for a solid-state motor starter according to claim 3, characterized in that: The dust removal ring (15) is rotatably connected to the dust cleaning plate (12) by being embedded in the slide groove (14) inside the dust cleaning hole (13). There are four groups of dust removal plates (16) in total. The dust removal plates (16) are inclined and fixedly connected to the middle of the dust removal ring (15) at equal distances.

6. The protective device for a solid-state motor starter according to claim 4, characterized in that: The lifting rod (24) is sleeved on the rotating column in the middle of the groove through a rotating hole and is rotatably connected to the fixing bar (17), and the bottom of the lifting rod (24) is movably connected to the top of the electric telescopic rod (18), and the humidity sensor (28) is electrically connected to the controller and the electric telescopic rod (18) through a line.

7. The protective device for a solid-state motor starter according to claim 4, characterized in that: The middle of the drying plate (21) is fixedly connected with water absorbing strips (25) at equal intervals, and the drying plate (21) is fixedly connected to the dehumidification frame (20) by embedding.

8. The protective device for a solid-state motor starter according to claim 3, characterized in that: A filter screen (26) is fixedly connected in the interlayer between the dust cleaning plate (12) and the air duct (10), and a shifting block (27) on the side of the dust shifting plate (16) is in contact with the filter screen (26).

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