High-protection intelligent safe MNS type low-voltage draw-out switch cabinet

Abstract

The invention belongs to the technical field of low-voltage switch cabinets, and particularly relates to a high-protection intelligent safety MNS type low-voltage draw-out switch cabinet which comprises a switch cabinet body, a plurality of drawer units and a plurality of supporting net plates used for supporting the drawer units, and the supporting net plates are fixedly connected with the inner wall of the switch cabinet body. And a constant-speed plugging mechanism is arranged at the top end of the drawer unit. The MNS type low-voltage draw-out type switch cabinet has intelligent moisture-proof and efficient cooling functions, the protection performance of the switch cabinet is improved, the universality of the switch cabinet is improved, the convenience of purchasing the MNS type low-voltage draw-out type switch cabinet by customers can be improved, the switch cabinet further has the function of inserting and pulling out the drawer units at a constant speed, and the service life of the MNS type low-voltage draw-out type switch cabinet is prolonged. Therefore, the convenience of pull-out inspection and maintenance of the drawer unit is improved, the condition of damage between the conductive plug component and the conductive female seat structure caused by impact type insertion of the drawer unit can be avoided, and the problem of increase of contact resistance at the position is further avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of low-voltage switch cabinets, and in particular relates to a high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet. Background Art

[0002] MNS type low-voltage withdrawable switchgear is a common low-voltage power distribution equipment. Its internal structure is reasonably designed, each functional unit is independent of each other, and the drawer unit has good interchangeability. It can be flexibly combined according to different power requirements. It is widely used in power plants, substations, industrial enterprises and other places for centralized control, distribution and protection of low-voltage electric energy, which can effectively improve the stability and reliability of the power supply system. For example, the patent with authorization announcement number CN208062641U discloses an MNS type low-voltage withdrawable switchgear.

[0003] At present, when customers need to install MNS low-voltage withdrawable switchgear in a humid environment or at a workstation with an altitude of more than 2,000 meters, they need to customize products with a higher protection level from the manufacturer. In high-altitude areas, due to the thin air, the heat dissipation efficiency of the switchgear is significantly reduced, resulting in a large amount of internal heat accumulation, which is very likely to cause frequent failures. In a humid environment, under low temperature conditions, condensation is easy to form on the surface of metal parts, which in turn causes short circuits in electrical components, seriously affecting the service life and reliability of the switchgear. This not only reflects the problem of insufficient product protection capability of MNS low-voltage withdrawable switchgear on the existing market, but also makes MNS low-voltage withdrawable switchgear have the defect of limited versatility, and also increases the inconvenience of customers purchasing MNS low-voltage withdrawable switchgear. In addition, in terms of operation, when the drawer unit of the MNS type low-voltage withdrawable switch cabinet is pulled out, because its conductive connection parts are tightly plugged in, the staff needs to rely on inertia to operate it laboriously, which greatly affects the convenience of operation. During the insertion process of the drawer unit, due to the lack of corresponding damping structure, the conductive plug component of the drawer unit will hit the conductive female seat structure inserted into the switch cabinet at a relatively fast speed. This impact not only easily causes surface damage to the conductive plug component and the conductive female seat structure, but also increases the contact resistance between the conductive plug component and the conductive female seat structure, making this position prone to heating failures, which has an adverse effect on the reliability of the drawer unit.

[0004] To this end, we propose a high-protection intelligent safety MNS type low-voltage withdrawable switchgear to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet in view of the above problems.

[0006] To achieve the above object, the present invention adopts the following technical solutions: A high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet, comprising a switch cabinet body, a plurality of drawer units and a plurality of support mesh plates for supporting the drawer units, wherein the plurality of support mesh plates are fixedly connected to the inner wall of the switch cabinet body, the top of the drawer unit is provided with a uniform speed plug-in mechanism, and the top of the plurality of uniform speed plug-in mechanisms is fixedly connected to the lower surface of the support mesh plate and the top of the switch cabinet body by bolts; The bottom end of the switch cabinet body is fixedly connected with a hollow base, the rear side wall of the hollow base is provided with a rectangular through hole, and the hole wall of the rectangular through hole is fixedly connected with a support plate, the front side wall of the hollow base is provided with a mounting through hole matched with the support plate, the upper surface of the support plate and the inner wall of the hollow base are fixedly connected with a partition, and the partition separates the top of the hollow base into an air guide area and a mechanical area; The upper surface of the support plate located in the mechanical area is fixedly connected with a PLC controller, an air pump and a cooling auxiliary mechanism; The air inlet end of the air pump is fixedly connected with a filter assembly.

[0007] In the above-mentioned high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet, the uniform speed plug-in and pull-out mechanism includes a cylinder, the two air holes of the cylinder are respectively fixedly connected with a control solenoid valve and an exhaust nozzle, the inner diameters of the control solenoid valve and the exhaust nozzle are consistent, the outer wall of the cylinder is fixedly connected with two fixing rings, the movable end of the cylinder is fixedly connected with a connecting block, the outer wall of the connecting block is provided with a first connecting hole, the air inlet end of the control solenoid valve is fixedly connected with a hose, the bottom end of the hose is fixedly connected with the upper surface of the hollow base located in the air guide area, and the rear side wall of the drawer unit is provided with a second connecting hole matching the first connecting hole.

[0008] In the above-mentioned high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet, the filter assembly includes an air intake hood fixedly connected to the upper surface of the support plate, the inner wall of the air intake hood is obliquely fixedly connected with a filter mesh, the outer wall of the filter mesh is fixedly connected with an activated carbon filter plate, and the side wall of the air intake hood is fixedly connected to the air intake end of the vacuum pump.

[0009] In the above-mentioned high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet, the cooling auxiliary mechanism includes a small compressor fixedly connected to the upper surface of the support plate, the upper surface of the support plate located in the mechanical area is provided with a circular hole, and the hole wall of the circular hole is fixedly connected to an insulating tube, the air outlet end of the vacuum pump is fixedly connected to a first air pipe, the air outlet end of the first air pipe is fixedly connected to the top of the insulating tube, the bottom end side wall of the insulating tube is fixedly connected to a three-way pipe, one of the air outlet ends of the three-way pipe is fixedly connected to a second air pipe, the air outlet end of the second air pipe passes through the partition and is connected to the air guide area, the other air outlet end of the three-way pipe is fixedly connected to a thick air guide pipe, the top of the thick air guide pipe is sealed and connected to a conductive connector, the wire of the conductive connector passes through the bottom end of the thick air guide pipe and is connected to the input of the PLC controller. The ends are electrically connected, the electrical connecting end of the conductive connector is electrically connected with a temperature and humidity sensor, the temperature and humidity sensor is fixedly embedded and connected with the top of the switch cabinet body, the top of the switch cabinet body is provided with a fixed through hole matched with the temperature and humidity sensor, the wall of the thick air pipe is fixedly connected with an air supply component whose number is consistent with the drawer unit, the interior of the insulation cylinder is provided with an evaporator coil, the top of the evaporator coil passes through the outer wall of the insulation cylinder, and is fixedly connected with the inlet pipeline of the small compressor, the delivery pipeline of the small compressor passes through the lower surface of the support plate, and is fixedly connected with a condenser assembly, the bottom end of the condenser assembly is fixedly connected with a throttle valve pipeline, the top of the throttle valve pipeline passes through the bottom end of the insulation cylinder, and is fixedly connected with the bottom end of the evaporator coil, and the bottom end of the insulation cylinder is fixedly connected with a drainage one-way valve.

[0010] In the above-mentioned high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet, the condenser assembly includes an L-shaped hollow tube, the tube wall of the L-shaped hollow tube is fixedly connected with a plurality of L-shaped capillaries, the entrance end of the throttle valve pipeline is fixedly connected with the bottom tube wall of the L-shaped hollow tube, the bottom end of the output pipeline of the small compressor is fixedly connected with the top of the L-shaped hollow tube, the bottom inner wall of the hollow base is fixedly connected with a support bar, the upper surface of the support bar is fixedly connected with a cooling fan, the air intake side of the cooling fan is fixedly connected with an air guide cover, the air intake end of the air guide cover passes through the rear side wall of the hollow base, and the lower surface of the support bar is fixedly connected with a liquid level sensor.

[0011] In the above-mentioned high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet, a normally closed solenoid valve and an exhaust duct are fixedly embedded in the rear side wall of the hollow base, and the normally closed solenoid valve is located at the bottom end of the hollow base.

[0012] In the above-mentioned high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet, the air supply component includes a third air pipe fixedly connected to the outer wall of the air guide thick pipe, the pipe wall of the air guide thick pipe is fixedly sleeved with an L-shaped fixing block, and the outer wall of the L-shaped fixing block is provided with two threaded holes, and the air outlet end of the third air pipe is fixedly connected to an externally threaded pipe matching the first connecting hole and the second connecting hole, and the pipe wall of the externally threaded pipe is threadedly connected with two fixing nuts.

[0013] In the above-mentioned high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet, the outer wall of the switch cabinet body is provided with a plurality of through holes, and the hole walls of the through holes are fixedly connected with push switches, and the plurality of push switches are respectively arranged in sequence corresponding to the plurality of control solenoid valves.

[0014] Compared with the existing technology, the advantages of a high-protection intelligent safety MNS type low-voltage withdrawable switchgear are: 1. Through the vacuum pump, cooling auxiliary mechanism, air supply assembly and condenser assembly, if the MNS low-voltage withdrawable switch cabinet works in a humid environment, the PLC controller first controls the vacuum pump and the cooling auxiliary mechanism to work, and the vacuum pump sucks air to the insulation cylinder, and the cooling auxiliary mechanism can cool the inside of the insulation cylinder through a small compressor, a condenser assembly, a throttle valve pipeline and an evaporator coil. At this time, the moisture carried in the air will be liquefied into water by the low-temperature environment and drip onto the bottom of the insulation cylinder. Finally, the water is discharged into the bottom of the hollow base through the drainage check valve. The dryness of the air injected into the switch cabinet body is increased by low-temperature dehumidification, thereby ensuring the dryness of the internal components of the switch cabinet body, thereby avoiding short-circuit failures of the conductive components inside the switch cabinet body due to condensation, and the water generated by dehumidification can further assist in cooling the condenser assembly. This mechanism enables the MNS low-voltage withdrawable switch cabinet to have an intelligent moisture-proof function, thereby improving the protection performance of the MNS low-voltage withdrawable switch cabinet.

[0015] 2. Through the vacuum pump, temperature and humidity sensor, cooling auxiliary mechanism and PLC controller, if the MNS low-voltage withdrawable switch cabinet is located at an altitude of more than 2,000 meters, and the heat inside the switch cabinet body accumulates due to the thin air to form a high-temperature environment, the temperature and humidity sensor cooperates with the PLC controller to improve the vacuum pump's vacuum efficiency, so that more air is injected into the switch cabinet body for cooling operations, avoiding the interference of the thin air environment on the heat dissipation of the switch cabinet body. If the vacuum pump works for 3 minutes after the vacuum speed is increased, the temperature and humidity sensor detects that the temperature inside the switch cabinet body is still higher than PL After the high temperature threshold preset by the C controller is reached, the PLC controller controls the small and medium compressors of the cooling auxiliary mechanism to start, so that the temperature of the air injected into the switch cabinet body is reduced, and the low-temperature air is used to accelerate the cooling effect inside the switch cabinet body to avoid the switch cabinet body being damaged by continuous high temperature. This mechanism enables the MNS type low-voltage withdrawable switch cabinet to have the function of intelligent and efficient cooling, improves the protection performance of the switch cabinet, and can adapt to the use requirements of workstations with an altitude of more than 2000 meters, ensuring the safety of continuous use of the switch cabinet, and improving the versatility of the switch cabinet, and can improve the convenience of customers purchasing the MNS type low-voltage withdrawable switch cabinet.

[0016] 3. Through the uniform plug-in and pull-out mechanism, external threaded pipe and fixing nut, when the MNS type low-voltage withdrawable switch cabinet needs to be pulled out for inspection or maintenance during use, the staff presses the push switch corresponding to the drawer unit to be pulled out, and the push switch cooperates with the PLC controller to control the cylinder of the corresponding uniform plug-in and pull-out mechanism to extend uniformly, and then the uniform plug-in and pull-out mechanism drives the conductive plug component of the drawer unit to be uniformly separated from the conductive female seat structure in the switch cabinet body, without manual labor to pull out the drawer unit. On the contrary, when the drawer unit needs to be installed, the uniform plug-in and pull-out mechanism can drive the conductive plug component of the drawer unit to be uniformly and stably inserted into the conductive female seat structure inside the switch cabinet body, thereby reducing the damage between the conductive plug component and the conductive female seat structure, and avoiding the heating failure of the connection position due to the increase of contact resistance. This mechanism enables the MNS type low-voltage withdrawable switch cabinet to have the function of uniform plug-in and pull-out of the drawer unit, which not only improves the convenience of the inspection and maintenance of the drawer unit, but also avoids the damage between the conductive plug component and the conductive female seat structure caused by the impact insertion of the drawer unit, thereby improving the reliability of the switch cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet provided by the present invention; Figure 2 It is a structural schematic diagram of the right side section of the hollow base of a high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet provided by the present invention; Figure 3 yes Figure 2 A schematic diagram of a partially enlarged structure; Figure 4 It is a schematic diagram of the structure inside the heat insulation cylinder in a high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet provided by the present invention; Figure 5 It is a structural schematic diagram of a drawer unit in a high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet provided by the present invention; Figure 6 yes Figure 1 A schematic diagram of the partially enlarged structure; Figure 7 It is a structural schematic diagram of a uniform speed plugging and unplugging mechanism in a high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet provided by the present invention; Figure 8 It is a structural schematic diagram of an L-shaped fixing block part in a high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet provided by the present invention; Fig. 9 It is a structural schematic diagram of an L-shaped hollow pipe part in a high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet provided by the present invention; Fig.10 It is a structural schematic diagram of a filter component in a high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet provided by the present invention.

[0018] In the figure: 1 switch cabinet body, 2 drawer unit, 3 support mesh plate, 4 uniform speed plug-in mechanism, 41 cylinder, 42 control solenoid valve, 43 exhaust nozzle, 44 fixing ring, 45 connection block, 46 first connection hole, 47 hose, 48 second connection hole, 5 hollow base, 6 cooling auxiliary mechanism, 61 small compressor, 62 insulation cylinder, 63 first air pipe, 64 three-way pipe, 65 second air pipe, 66 air guide thick pipe, 67 conductive connector, 68 temperature and humidity sensor, 69 evaporator coil, 610 throttle valve pipeline, 611 drainage check valve , 7 filter assembly, 71 air intake hood, 72 filter mesh, 73 activated carbon filter plate, 8 air supply assembly, 81 third air pipe, 82 L-shaped fixing block, 83 threaded hole, 84 external threaded pipe, 85 fixing nut, 9 condenser assembly, 91 L-shaped hollow tube, 92 L-shaped capillary, 93 support bar, 94 cooling fan, 95 air guide hood, 96 liquid level sensor, 10 support plate, 11 partition, 12 air guide area, 13 mechanical area, 14 PLC controller, 15 vacuum pump, 16 normally closed solenoid valve, 17 exhaust duct, 18 push switch. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1-Figure 10 As shown, a high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet includes a switch cabinet body 1, multiple drawer units 2 and multiple supporting mesh plates 3 for supporting the drawer units 2. The multiple supporting mesh plates 3 are fixedly connected to the inner wall of the switch cabinet body 1. The top of the drawer unit 2 is provided with a uniform speed plug-in mechanism 4, and the tops of the multiple uniform speed plug-in mechanisms 4 are fixedly connected to the lower surface of the supporting mesh plate 3 and the top of the switch cabinet body 1 through bolts. The uniform speed plug-in mechanism 4 includes a cylinder 41. The two vents of the cylinder 41 are respectively fixedly connected to a control solenoid valve 42 and an exhaust nozzle 43. The inner diameters of the control solenoid valve 42 and the exhaust nozzle 43 are consistent. The outer wall of the cylinder 41 is fixedly connected to two A fixing ring 44 is provided, and a connecting block 45 is fixedly connected to the movable end of the cylinder 41. A first connecting hole 46 is provided on the outer wall of the connecting block 45. A hose 47 is fixedly connected to the air inlet end of the control solenoid valve 42. The bottom end of the hose 47 is fixedly connected to the upper surface of the hollow base 5 located at the air guide area 12. A second connecting hole 48 matching the first connecting hole 46 is provided on the rear side wall of the drawer unit 2. This mechanism enables the MNS type low-voltage withdrawable switch cabinet to have the function of uniformly plugging and unplugging the drawer unit 2, which not only improves the convenience of unplugging, checking and maintaining the drawer unit 2, but also avoids the damage between the conductive plug component and the conductive female seat structure caused by the impact insertion of the drawer unit 2.

[0021] A plurality of through holes are provided on the outer wall of the switch cabinet body 1, and a push switch 18 is fixedly connected to the hole wall of the through hole. The plurality of push switches 18 are arranged in sequence corresponding to the plurality of control solenoid valves 42 respectively. One push switch 18 can specifically control the opening and closing of a control solenoid valve 42 in a uniform speed plug-in mechanism 4, thereby ensuring the convenience of using the plurality of uniform speed plug-in mechanisms 4.

[0022] A hollow base 5 is fixedly connected to the bottom end of the switch cabinet body 1, and a normally closed solenoid valve 16 and an exhaust duct 17 are fixedly embedded in the rear side wall of the hollow base 5. The normally closed solenoid valve 16 is located at the bottom end of the hollow base 5. When the normally closed solenoid valve 16 is opened, the excess water accumulated inside the hollow base 5 can be discharged. A rectangular through hole is provided in the rear side wall of the hollow base 5, and a support plate 10 is fixedly connected to the hole wall of the rectangular through hole. A mounting through hole matching the support plate 10 is provided in the front side wall of the hollow base 5. A partition 11 is fixedly connected to the upper surface of the support plate 10 and the inner wall of the hollow base 5. The partition 11 separates the top of the hollow base 5 into an air guide area 12 and a mechanical area 13.

[0023] The upper surface of the support plate 10 located in the mechanical area 13 is fixedly connected with a PLC controller 14, an air pump 15 and a cooling auxiliary mechanism 6. The cooling auxiliary mechanism 6 includes a small compressor 61 fixedly connected to the upper surface of the support plate 10. The upper surface of the support plate 10 located in the mechanical area 13 is provided with a circular hole, and the hole wall of the circular hole is fixedly connected with an insulating tube 62. The air outlet end of the air pump 15 is fixedly connected with a first air pipe 63, and the air outlet end of the first air pipe 63 is fixedly connected with the top end of the insulating tube 62. The bottom side wall of the heat-insulating tube 62 is fixedly connected with a three-way tube 64, one of the gas outlet ends of the three-way tube 64 is fixedly connected with a second gas pipe 65, the gas outlet end of the second gas pipe 65 passes through the partition 11 and is connected with the gas guide area 12, the other gas outlet end of the three-way tube 64 is fixedly connected with a gas guide thick tube 66, the top of the gas guide thick tube 66 is sealed and connected with a conductive connector 67, the wire of the conductive connector 67 passes through the bottom end of the gas guide thick tube 66, and is electrically connected to the input end of the PLC controller 14, The power connection end of the conductive connector 67 is electrically connected to a temperature and humidity sensor 68, and the temperature and humidity sensor 68 is fixedly embedded and connected to the top of the switch cabinet body 1. A fixed through hole matching the temperature and humidity sensor 68 is opened at the top of the switch cabinet body 1. The wall of the air guide tube 66 is fixedly connected to an air supply component 8 whose number is the same as that of the drawer unit 2. An evaporator coil 69 is provided inside the insulation tube 62. The top of the evaporator coil 69 passes through the outer wall of the insulation tube 62 and is fixedly connected to the inlet pipeline of the small compressor 61. The delivery pipeline of the small compressor 61 passes through the lower surface of the support plate 10 and is fixedly connected to the condenser assembly 9. The bottom end of the condenser assembly 9 is fixedly connected to a throttle valve pipeline 610. The top of the throttle valve pipeline 610 passes through the bottom end of the insulation tube 62 and is fixedly connected to the bottom end of the evaporator coil 69. The bottom end of the insulation tube 62 is fixedly connected to a drainage check valve 611. This mechanism can not only achieve the effect of dehumidification, but also assist in the heat dissipation inside the switch cabinet body 1.

[0024] The air supply component 8 includes a third air pipe 81 fixedly connected to the outer wall of the air guide tube 66, the tube wall of the air guide tube 66 is fixedly sleeved with an L-shaped fixing block 82, the outer wall of the L-shaped fixing block 82 is provided with two threaded holes 83, the air outlet end of the third air pipe 81 is fixedly connected with an externally threaded tube 84 matching the first connecting hole 46 and the second connecting hole 48, the tube wall of the externally threaded tube 84 is threadedly connected with two fixing nuts 85, this mechanism can not only transport air to quickly cool down the drawer unit 2, but also connect the connecting block 45 and the drawer unit 2 into a whole, so as to facilitate the uniform speed plugging and unplugging mechanism 4 to drive the drawer unit 2 to plug and unplug at a uniform speed.

[0025] The condenser assembly 9 includes an L-shaped hollow tube 91, the tube wall of the L-shaped hollow tube 91 is fixedly connected with a plurality of L-shaped capillaries 92, the entrance end of the throttle valve pipeline 610 is fixedly connected with the bottom tube wall of the L-shaped hollow tube 91, the bottom end of the output pipeline of the small compressor 61 is fixedly connected with the top of the L-shaped hollow tube 91, the bottom inner wall of the hollow base 5 is fixedly connected with a support bar 93, the upper surface of the support bar 93 is fixedly connected with a cooling fan 94, the air inlet side of the cooling fan 94 is fixedly connected with an air guide cover 95, the air inlet end of the air guide cover 95 passes through the rear side wall of the hollow base 5, the lower surface of the support bar 93 is fixedly connected with a liquid level sensor 96, this mechanism can not only expand the heat dissipation area of ​​the L-shaped hollow tube 91, but also make full use of the water generated by dehumidification to assist in rapid cooling.

[0026] The air inlet end of the vacuum pump 15 is fixedly connected to the filter assembly 7, and the filter assembly 7 includes an air inlet hood 71 fixedly connected to the upper surface of the support plate 10, the inner wall of the air inlet hood 71 is obliquely fixedly connected to a filter mesh 72, the outer wall of the filter mesh 72 is fixedly connected to an activated carbon filter plate 73, and the side wall of the air inlet hood 71 is fixedly connected to the air inlet end of the vacuum pump 15. This mechanism can filter and remove impurities from the air sucked in by the vacuum pump 15.

[0027] The control solenoid valve 42, the small compressor 61, the normally closed solenoid valve 16 and the cooling fan 94 are all electrically connected to the output end of the PLC controller 14 through wires, and the output circuits of the liquid level sensor 96 and the multiple push switches 18 are all electrically connected to the input end of the PLC controller 14 through wires. The above-mentioned power-on devices and electrical connections are all existing technologies and will not be repeated here.

[0028] The operating principle of the present invention is described as follows: before the MNS type low-pressure withdrawable switch cabinet is used, not only is refrigerant added to the circuit composed of the small compressor 61, the evaporator coil 69, the throttle valve pipeline 610 and the condenser assembly 9, but also the air supply assembly 8 is installed inside the switch cabinet body 1, and the air outlet end of the air supply assembly 8 is placed inside the drawer unit 2, and at the same time, a plurality of uniform speed plug-in mechanisms 4 are sequentially installed at the top of the switch cabinet body 1 or the lower surface of the support mesh plate 3 at the top of the plurality of drawer units 2, and at the same time, the external threaded tube 84 of the air supply assembly 8 passes through the first connecting hole 46 and the second connecting hole 48, and then the external threaded tube 84, the connecting block 45 and the drawer unit 2 are fixed together by the fixing nut 85, and the air supply and exhaust duct 17 and the normally closed solenoid valve 16 are connected to the corresponding delivery pipes; If the MNS low-voltage withdrawable switch cabinet works in a humid environment, the PLC controller 14 first controls the vacuum pump 15 to work, and the vacuum pump 15 filters and removes impurities from the sucked air through the filter assembly 7, and detects the temperature and humidity inside the switch cabinet body 1 at the heat dissipation exhaust position on the top of the switch cabinet body 1 through the temperature and humidity sensor 68, and the detected temperature and humidity values ​​are sent to the PLC controller 14 in the form of electrical signals. If the temperature and humidity sensor 68 detects that the exhaust air humidity value inside the switch cabinet body 1 exceeds the high humidity threshold value preset by the PLC controller 14, the PLC controller 14 controls the small compressor 61 and the cooling fan 94 to work, and the small compressor 61 compresses the gaseous refrigerant into the air. The air is compressed into a high-temperature and high-pressure gas, which is liquefied into a high-pressure liquid through the condenser assembly 9. The L-shaped capillary 92 can expand the heat dissipation area of ​​the L-shaped hollow tube 91. The heat dissipation fan 94 draws outside air through the wind guide cover 95 and blows it to the condenser assembly 9 to achieve cooling of the condenser assembly 9. After heat dissipation, the air is discharged through the exhaust duct 17. The high-pressure liquid discharged from the condenser assembly 9 is reduced in pressure to a low-temperature and low-pressure liquid through the throttle valve pipeline 610, and finally absorbs heat and vaporizes in the evaporator coil 69, and takes away the heat of the air in the insulation tube 62, thereby reducing the air temperature. At this time, the moisture carried in the air will be liquefied into water by the low-temperature environment and drip onto the bottom of the insulation tube 62. Finally, the water is discharged into the bottom of the hollow base 5 through the drainage check valve 611. The dryness of the air injected into the switch cabinet body 1 is increased by low-temperature dehumidification, thereby ensuring the dryness of the internal components of the switch cabinet body 1, thereby avoiding short-circuit failure of the conductive components inside the switch cabinet body 1 due to condensation. Moreover, the greater the humidity value, the PLC controller 14 increases the blowing speed of the cooling fan 94 according to the input humidity value signal, and improves the heat dissipation efficiency of the cooling fan 94 to the L-shaped hollow tube 91 and the L-shaped capillary tube 92. Then the heat absorption and cooling effect of the evaporator coil 69 is also improved, ensuring that the inside of the switch cabinet body 1 can work dryly and reliably in a humid environment. Moreover, the water discharged into the hollow base 5 can also assist the heat dissipation of the condenser component 9. When the water evaporates, it can quickly absorb a large amount of heat. To ensure that the refrigerant inside the condenser assembly 9 quickly dissipates heat, the evaporated water will be discharged from the exhaust duct 17 along with the air. If there is too much water at the bottom of the hollow base 5 and the liquid level of the water touches the liquid level sensor 96, the liquid level sensor 96 sends an electrical signal to the PLC controller 14, and the PLC controller 14 controls the normally closed solenoid valve 16 to be energized and opened for 1 minute. After the normally closed solenoid valve 16 is opened, the excess water at the bottom of the hollow base 5 can be discharged to prevent the excessive water from flooding the cooling fan 94 and affecting the normal operation of the cooling auxiliary mechanism 6. The cooling effect of the cooling auxiliary mechanism 6 is improved by improving the heat dissipation of the condenser assembly 9, and the power consumption of the cooling auxiliary mechanism 6 can be reduced when working, thereby achieving the purpose of energy saving and environmental protection. If the MNS low-voltage withdrawable switch cabinet is located at an altitude of more than 2000 meters, and the heat inside the switch cabinet body 1 accumulates to form a high-temperature environment due to the thin air, the temperature and humidity sensor 68 detects that the temperature value inside the switch cabinet body 1 exceeds the high-temperature threshold preset by the PLC controller 14, and the PLC controller 14 will control the inverter of the vacuum pump 15 to change the power supply frequency supplied to the vacuum pump 15 motor. The PLC controller 14 and the inverter transmit data through the communication protocol. The PLC controller 14 sends a frequency increase instruction to the inverter. The inverter adjusts the output frequency according to the received instruction, thereby controlling the speed of the vacuum pump 15 motor to increase, thereby achieving vacuum extraction. The speed is increased, and then the vacuum pump 15 injects air into the insulation tube 62 through the first air pipe 63, and then the air enters the air guide area 12 and the interior of multiple air supply components 8 through the three-way pipe 64, the second air pipe 65 and the air guide thick pipe 66. The air supply component 8 allows more air to enter the switch cabinet body 1 for heat dissipation, avoiding the interference of the thin air environment on the heat dissipation of the switch cabinet body 1 in the plateau. The air of the air supply component 8 is transported to the interior of the drawer unit 2 through the third air pipe 81 and the external threaded pipe 84, and the conductive components inside the drawer unit 2 are quickly cooled. The cooled air is sucked out by the heat dissipation fan on the top of the switch cabinet body 1 to ensure that the switch cabinet body 1 can work normally and reliably; If the vacuum pump 15 works for 3 minutes after the vacuum speed is increased, when the temperature and humidity sensor 68 detects that the temperature inside the switch cabinet body 1 still exceeds the high temperature threshold preset by the PLC controller 14, the PLC controller 14 will control the small compressor 61 of the cooling auxiliary mechanism 6 to work, and reduce the temperature inside the insulation tube 62 through the evaporator coil 69, so that the temperature of the air injected into the switch cabinet body 1 is reduced, and the low-temperature air is used to accelerate the cooling effect inside the switch cabinet body 1, so as to avoid the switch cabinet body 1 being damaged by continuous high temperature. This mechanism enables the MNS type low-voltage withdrawable switch cabinet to have the functions of intelligent moisture prevention and efficient cooling, improves the protection performance of the MNS type low-voltage withdrawable switch cabinet, and can adapt to the use requirements of humid environments and workstations with an altitude of more than 2000 meters, ensures the safety of the continuous use of the MNS type low-voltage withdrawable switch cabinet, and improves the versatility of the MNS type low-voltage withdrawable switch cabinet, and can improve the convenience of customers purchasing the MNS type low-voltage withdrawable switch cabinet; When the MNS low-voltage withdrawable switch cabinet needs to be used to pull out the drawer unit 2 for inspection or maintenance, the staff presses the push switch 18 corresponding to the drawer unit 2 to be pulled out, and the push switch 18 sends an electrical signal to the PLC controller 14 to pull out the drawer unit 2. The PLC controller 14 controls the control solenoid valve 42 corresponding to the drawer unit 2 to be pulled out according to the electrical signal, and makes the control solenoid valve 42 powered on and open for 30 seconds. During the 30 seconds, the PLC controller 14 also controls the vacuum pump 15 to work, and the vacuum pump 15 supplies air to the air guide area 12. At this time, the air inside the air guide area 12 is input into the cylinder 41 through the hose 47 and the opened control solenoid valve 42, and the cylinder 41 is extended. When the cylinder 41 is extended, Since the inner diameter of the exhaust nozzle 43 is consistent with that of the control solenoid valve 42, the amount of air injected into and discharged from the cylinder 41 is equal, and the extension of the cylinder 41 will have a damping effect, ensuring that the cylinder 41 can extend at a uniform speed. During the uniform extension of the cylinder 41, the cylinder 41 drives the drawer unit 2 to be automatically pulled out at a uniform speed through the external threaded tube 84, the fixing nut 85 and the connecting block 45, so that the staff does not need to laboriously move the drawer unit 2, ensuring that the conductive plug component of the drawer unit 2 can be separated from the conductive female seat structure inside the switch cabinet body 1 at a uniform speed. Finally, after the drawer unit 2 is pulled out, the fixing nut 85 is separated to separate the external threaded tube 84 from the first connecting hole 46 in the connecting block 45, so that the drawer unit 2 is taken out without constraint, thereby facilitating the inspection and maintenance of the drawer unit 2. If the drawer unit 2 needs to be installed in the switch cabinet body 1, first install the drawer unit 2 to the corresponding drawer hole position of the switch cabinet body 1, and insert the external threaded tube 84 into the second connecting hole 48 and the first connecting hole 46 in turn, and then limit it through the fixing nut 85. Then the staff pushes the drawer unit 2 to insert it. While pushing the drawer unit 2, the staff also needs to press the push switch 18 corresponding to the drawer unit 2. Pressing the switch 18 makes the corresponding control solenoid valve 42 energized and open for 30 seconds. At this time, since the inner diameters of the exhaust nozzle 43 and the control solenoid valve 42 are consistent, the amount of air inhaled from the exhaust nozzle 43 when the cylinder 41 contracts is consistent with the amount of air discharged from the control solenoid valve 42. Due to the limitation of the inner diameter of the control solenoid valve 42, the resistance to rapid exhaust during the contraction process of the cylinder 41 is relatively large, and it has a self-damping effect, thereby ensuring that the cylinder 41 contracts at a uniform speed The uniformly contracted cylinder 41 can drive the conductive plug component of the drawer unit 2 to stably insert into the conductive female seat structure inside the switch cabinet body 1, thereby avoiding the conductive plug component of the drawer unit 2 to be quickly and impact-type inserted into the conductive female seat structure inside the switch cabinet body 1, thereby reducing the damage between the conductive plug component and the conductive female seat structure, and avoiding the heating failure at the connection position due to the increase in contact resistance, thereby ensuring that the switch cabinet body 1 and the drawer unit 2 can operate continuously and stably. This mechanism enables the MNS type low-voltage withdrawable switch cabinet to have the function of uniformly plugging and unplugging the drawer unit 2, which not only improves the convenience of the drawer unit 2 to be pulled out, inspected and maintained, but also avoids the damage between the conductive plug component and the conductive female seat structure caused by the impact-type insertion of the drawer unit 2, thereby avoiding the increase in contact resistance at this position and heating, thereby improving the reliability of the use of the MNS type low-voltage withdrawable switch cabinet.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet, comprising a switch cabinet body (1), a plurality of drawer units (2) and a plurality of support mesh plates (3) for supporting the drawer units (2), wherein the plurality of support mesh plates (3) are all fixedly connected to the inner wall of the switch cabinet body (1), characterized in that: The top of the drawer unit (2) is provided with a uniform speed plugging and unplugging mechanism (4), and the tops of a plurality of the uniform speed plugging and unplugging mechanisms (4) are fixedly connected to the lower surface of the supporting mesh plate (3) and the top of the switch cabinet body (1) by means of bolts; The bottom end of the switch cabinet body (1) is fixedly connected to a hollow base (5), a rear side wall of the hollow base (5) is provided with a rectangular through hole, and a support plate (10) is fixedly connected to the hole wall of the rectangular through hole, a front side wall of the hollow base (5) is provided with a mounting through hole matched with the support plate (10), the upper surface of the support plate (10) and the inner wall of the hollow base (5) are fixedly connected to a partition plate (11), and the partition plate (11) separates the top of the hollow base (5) into an air guide area (12) and a mechanical area (13); The upper surface of the support plate (10) located in the mechanical area (13) is fixedly connected with a PLC controller (14), an air extraction pump (15) and a cooling auxiliary mechanism (6); The air inlet end of the air pump (15) is fixedly connected to a filter assembly (7).

2. According to claim 1, a high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet is characterized in that: The uniform speed plugging and unplugging mechanism (4) comprises a cylinder (41), wherein two air vents of the cylinder (41) are fixedly connected to a control solenoid valve (42) and an exhaust nozzle (43), respectively, wherein the inner diameters of the control solenoid valve (42) and the exhaust nozzle (43) are consistent, wherein the outer wall of the cylinder (41) is fixedly connected to two fixing rings (44), wherein the movable end of the cylinder (41) is fixedly connected to a connecting block (45), wherein the outer wall of the connecting block (45) is provided with a first connecting hole (46), wherein the air inlet end of the control solenoid valve (42) is fixedly connected to a hose (47), wherein the bottom end of the hose (47) is fixedly connected to the upper surface of the hollow base (5) located at the air guide area (12), and wherein the rear side wall of the drawer unit (2) is provided with a second connecting hole (48) matching the first connecting hole (46).

3. According to claim 1, a high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet is characterized in that: The filter assembly (7) comprises an air intake hood (71) fixedly connected to the upper surface of the support plate (10); a filter mesh (72) is fixedly connected to the inner wall of the air intake hood (71) at an angle; an activated carbon filter plate (73) is fixedly connected to the outer wall of the filter mesh (72); and a side wall of the air intake hood (71) is fixedly connected to the air intake end of the air pump (15).

4. According to claim 1, a high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet is characterized in that: The cooling auxiliary mechanism (6) comprises a small compressor (61) fixedly connected to the upper surface of the support plate (10); a circular hole is opened on the upper surface of the support plate (10) located in the mechanical area (13); a heat insulating tube (62) is fixedly connected to the hole wall of the circular hole; an air outlet end of the air pump (15) is fixedly connected to a first air pipe (63); an air outlet end of the first air pipe (63) is fixedly connected to the top end of the heat insulating tube (62); a three-way pipe (64) is fixedly connected to the side wall of the bottom end of the heat insulating tube (62); and the three-way pipe (64) is fixedly connected to the bottom end of the heat insulating tube (62). One of the gas outlet ends of the tube (64) is fixedly connected to a second gas pipe (65), the gas outlet end of the second gas pipe (65) passes through the partition (11) and is connected to the gas guide area (12), the other gas outlet end of the three-way tube (64) is fixedly connected to a thick gas guide tube (66), the top end of the thick gas guide tube (66) is sealed and connected to a conductive connector (67), the wire of the conductive connector (67) passes through the bottom end of the thick gas guide tube (66) and is electrically connected to the input end of the PLC controller (14), the conductive connector The power connection end of the switch cabinet (67) is electrically connected to a temperature and humidity sensor (68), the temperature and humidity sensor (68) is fixedly embedded and connected to the top of the switch cabinet body (1), the top of the switch cabinet body (1) is provided with a fixed through hole matched with the temperature and humidity sensor (68), the wall of the air guide tube (66) is fixedly connected to an air supply assembly (8) whose number is the same as that of the drawer units (2), the interior of the heat insulation tube (62) is provided with an evaporator coil (69), the top of the evaporator coil (69) passes through the heat insulation tube (6 2) and is fixedly connected to the inlet pipeline of the small compressor (61); the delivery pipeline of the small compressor (61) passes through the lower surface of the support plate (10) and is fixedly connected to the condenser assembly (9); the bottom end of the condenser assembly (9) is fixedly connected to a throttle valve pipeline (610); the top end of the throttle valve pipeline (610) passes through the bottom end of the insulation tube (62) and is fixedly connected to the bottom end of the evaporator coil (69); the bottom end of the insulation tube (62) is fixedly connected to a drain check valve (611).

5. According to claim 4, a high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet is characterized in that: The condenser assembly (9) comprises an L-shaped hollow tube (91), the tube wall of the L-shaped hollow tube (91) is fixedly connected to a plurality of L-shaped capillaries (92), the inlet end of the throttle valve pipeline (610) is fixedly connected to the bottom tube wall of the L-shaped hollow tube (91), the bottom end of the output pipeline of the small compressor (61) is fixedly connected to the top of the L-shaped hollow tube (91), the bottom inner wall of the hollow base (5) is fixedly connected to a support bar (93), the upper surface of the support bar (93) is fixedly connected to a cooling fan (94), the air inlet side of the cooling fan (94) is fixedly connected to an air guide cover (95), the air inlet end of the air guide cover (95) passes through the rear side wall of the hollow base (5), and the lower surface of the support bar (93) is fixedly connected to a liquid level sensor (96).

6. A high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet according to claim 5, characterized in that: A normally closed solenoid valve (16) and an exhaust duct (17) are fixedly embedded in the rear side wall of the hollow base (5); the normally closed solenoid valve (16) is located at the bottom end of the hollow base (5).

7. According to claim 4, a high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet is characterized in that: The air delivery assembly (8) comprises a third air pipe (81) fixedly connected to the outer wall of the air guide thick pipe (66); an L-shaped fixing block (82) is fixedly sleeved on the pipe wall of the air guide thick pipe (66); the outer wall of the L-shaped fixing block (82) is provided with two threaded holes (83); an air outlet end of the third air pipe (81) is fixedly connected to an externally threaded pipe (84) matching the first connecting hole (46) and the second connecting hole (48); the pipe wall of the externally threaded pipe (84) is threadedly connected to two fixing nuts (85).

8. According to claim 2, a high-protection intelligent safety MNS type low-voltage withdrawable switch cabinet is characterized in that: The outer wall of the switch cabinet body (1) is provided with a plurality of through holes, and the hole walls of the through holes are fixedly connected with push switches (18), and the plurality of push switches (18) are arranged in sequence corresponding to the plurality of control solenoid valves (42).

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