CN211480532U - Safe and reliable low-voltage power distribution device for electrical network - Google Patents

Abstract

The utility model relates to a safe and reliable low-voltage power distribution device for an electrical network, which comprises a base, an installation block, a cabinet body, a cabinet door, two support mechanisms and two ventilation mechanisms, wherein the support mechanisms comprise a support box, a support frame, a lifting assembly and a support plate, the lifting assembly comprises a driving unit, a fixed block, a translation block, a telescopic frame, a slide block and a sliding frame, the ventilation mechanism comprises a ventilation pipe, a transverse pipe and two ventilation assemblies, an air valve is arranged in the ventilation pipe, the ventilation assemblies comprise a vertical pipe, a sealing unit and a ventilation unit, the safe and reliable low-voltage power distribution device for the electrical network can facilitate the exchange of air inside and outside the cabinet body through the ventilation mechanisms, cool and radiate heat, remove dust and dry the air entering the cabinet body, prevent the humidity in the cabinet body from being too high, not only can support the cabinet body to move upwards through the support mechanisms, and, avoid the internal portion of cabinet to soak and damage to factor of safety and practicality of this low-voltage distribution cabinet have been improved.

Description

Safe and reliable low-voltage power distribution device for electrical network

Technical Field

The utility model relates to an electrical equipment field, in particular to safe and reliable's low pressure distribution device for electric network.

Background

Low-voltage distribution cabinets are the last-stage devices in low-voltage distribution systems. The power distribution cabinet is used in a relatively dispersed load loop; motor control centers are used in load concentration, loop-rich applications, where they distribute power from a circuit of a higher level of power distribution equipment to nearby loads, where the equipment provides protection, control, and monitoring of the loads.

Some current low-voltage distribution cabinets install when the open air is used, most all factor of safety is lower, especially in the humid weather of some rainy days, because air humidity is great under overcast and rainy weather, the switch board is when ventilating and radiating, introduce the internal cabinet with the moisture in the air easily, when the internal humidity of cabinet is great, arouse the short circuit easily and set up equipment fault and damage, moreover, current low-voltage distribution cabinet all adopts fixed emergence when the installation, under the condition that takes place urban waterlogging, the rainwater can not in time be discharged, the high water level can cause ponding to dip the switch board, influence the use of equipment and lead to the switch board fault to damage, and then the practicality of current low-voltage distribution cabinet has been reduced.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: in order to overcome the disadvantages of the prior art, a safe and reliable low-voltage power distribution device for an electrical network is provided.

The utility model provides a technical scheme that its technical problem adopted is: a safe and reliable low-voltage power distribution device for an electrical network comprises a base, an installation block, a cabinet body, a cabinet door, two support mechanisms and two ventilation mechanisms, wherein the installation block is arranged above the base, the cabinet body is fixed above the installation block, the cabinet door is arranged on the cabinet body, a door handle, a display screen, a plurality of keys and a plurality of electric meters are arranged on the cabinet door, a PLC is arranged in the cabinet body, the keys, the display screen and the electric meters are all electrically connected with the PLC, the two support mechanisms are respectively positioned on two sides of the cabinet body, the two ventilation mechanisms are respectively positioned on two sides of the cabinet body, and a cavity is arranged in the installation block;

the supporting mechanism comprises a supporting box, a supporting frame, a lifting component and a supporting plate, the supporting box is arranged downwards, the supporting box is fixed on the cabinet body, one end of the supporting frame is fixed on the supporting box, the other end of the supporting frame is abutted against the base, the lifting component and the supporting plate are both positioned in the supporting box, the lifting component is in transmission connection with the supporting plate, the lifting component comprises a driving unit, a fixed block, a translation block, a telescopic frame, a sliding block and a sliding frame, the driving unit is in transmission connection with the translation block, the fixed block is fixed at the bottom in the supporting box, the two sides of the bottom end of the telescopic frame are respectively hinged with the sliding block and the supporting plate, the two sides of the top end of the telescopic frame are respectively hinged with the fixed block and the translation block, the sliding frame is U-shaped, two ends of the sliding frame are fixed above the supporting plate, and the sliding block is sleeved on the sliding frame;

the ventilating mechanism comprises a ventilating pipe, a transverse pipe and two ventilating assemblies, one end of the ventilating pipe is communicated with the cabinet body, the other end of the ventilating pipe is communicated with the upper part of the center of the transverse pipe, the two ventilating assemblies are respectively positioned below the two ends of the transverse pipe, an air valve is arranged in the ventilating pipe, the ventilating assemblies comprise vertical pipes, sealing units and ventilating units, the top ends of the vertical pipes are communicated with the transverse pipe, the sealing units are arranged at the bottom ends of the vertical pipes, the ventilating units are positioned in the vertical pipes, the ventilating units sequentially comprise heating wires, fans, dredging assemblies and filter cotton from top to bottom, the heating wires, the fans and the filter cotton are all fixed in the vertical pipes, and the air valves, the heating wires and the fans are all electrically;

a temperature measuring module is arranged in the cabinet body and comprises a temperature measuring circuit, the temperature measuring circuit comprises a first operational amplifier U1, a second operational amplifier U2, a third operational amplifier U3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first adjustable resistor Rp1, a second adjustable resistor Rp2 and a third adjustable resistor Rp3, the inverting input end of the first operational amplifier U1 is connected with the first capacitor C1, the non-inverting input end of the first operational amplifier U1 is grounded through the first resistor R1, the non-inverting input end of the first operational amplifier U1 is connected with the output end of the first operational amplifier U1 through the second resistor R2, the output end of the first operational amplifier U1 is grounded through the first adjustable resistor Rp1, an adjustable end of the first adjustable resistor Rp1 is connected with an output end of a first operational amplifier U1, an output end of the first operational amplifier U1 is connected with an inverting input end of a second operational amplifier U2 through a series circuit composed of a third resistor R3 and a fourth resistor R4, an inverting input end of the second operational amplifier U2 is grounded through a third capacitor C3, a non-inverting input end of the second operational amplifier U2 is connected with an inverting input end of a third operational amplifier U3 through a series circuit composed of a second capacitor C2 and a fifth resistor R5 respectively through a third resistor R3 and a fourth resistor R4, an output end of the second operational amplifier U2 is connected with an inverting input end of the third operational amplifier U3 through a sixth resistor R6, an inverting input end of the third operational amplifier U3 is connected with an output end of the third operational amplifier U3 through a third adjustable resistor Rp3, an adjustable end of the third resistor Rp3 is connected with an output end of a third operational amplifier U3, the non-inverting input terminal of the third operational amplifier U3 is grounded through a second adjustable resistor Rp2, and the adjustable terminal of the second adjustable resistor Rp2 is connected to the non-inverting input terminal of the third operational amplifier U3.

Preferably, in order to drive the translation block to translate, the driving unit comprises a first motor and a screw rod, the first motor is fixed at the bottom of the supporting box and electrically connected with the PLC, the first motor is in transmission connection with one end of the screw rod, the other end of the screw rod is arranged in the fixing block, the translation block is sleeved on the screw rod, and a thread matched with the screw rod is arranged at the connection part of the translation block and the screw rod.

Preferably, in order to detect whether the support plate is in contact with the ground, a pressure gauge is arranged in the support plate, and the pressure gauge is electrically connected with the PLC.

Preferably, in order to realize the stable lifting movement of the cabinet body, the supporting mechanism further comprises a vertical rod and a circular ring, the vertical rod is fixed above the base, the circular ring is fixedly connected with the supporting box, and the circular ring is sleeved on the vertical rod.

Preferably, in order to prevent the mounting block from deforming, a supporting rod is arranged in the cavity, and the bottom end and the top end of the supporting rod are fixedly connected with the bottom and the top in the mounting block respectively.

Preferably, in order to detect the humidity and the flow of the air introduced into the cabinet body, a hygrometer and a flowmeter are arranged in the ventilation pipe and are electrically connected with the PLC.

Preferably, in order to control the opening and closing of the vertical pipe and the opening of the vertical pipe, the sealing unit comprises a sealing plate, a second motor, a wire coil, a pull rope and a support, the second motor is fixed below the transverse pipe and electrically connected with the PLC, the second motor is in transmission connection with the wire coil, the wire coil is connected with one end of the sealing plate through the pull rope, the sealing plate is covered at the bottom end of the vertical pipe, one end of the support is hinged to one end, far away from the pull rope, of the sealing plate, and the other end of the support is fixedly connected with the vertical pipe.

Preferably, in order to avoid wear of the pull rope, the sealing unit further comprises a guide wheel arranged on a side of the stand pipe remote from the bracket, the pull rope abutting against the guide wheel.

As preferred, in order to facilitate the mediation to the filter pulp, the mediation subassembly includes third motor, actuating lever, driven lever, flat board and a plurality of mediation unit, the third motor is fixed in the standpipe, the third motor is connected with the PLC electricity, the third motor is connected with the actuating lever transmission, the actuating lever passes through the driven lever and is dull and stereotyped articulated, mediation unit evenly distributed is in dull and stereotyped below, the mediation unit includes spring and reciprocal piece, the reciprocal piece passes through the spring setting in dull and stereotyped below.

Preferably, in order to realize the stable movement of the flat plate, a limiting ring and a limiting rod are arranged above two ends of the flat plate, the limiting rod is fixed above the flat plate, the limiting ring is sleeved on the limiting rod, and the limiting ring is fixed on the inner wall of the vertical pipe.

The beneficial effects of the utility model are that, this a safe and reliable's low voltage distribution device for electric network can make things convenient for the internal and external air of cabinet to exchange through ventilation mechanism, cool down the heat dissipation, and can remove dust the drying to the internal air of entering cabinet, prevent that the internal humidity of cabinet is too big, moreover, can support cabinet body rebound through supporting mechanism, drive the cabinet body and keep away from ponding when taking place the waterlogging, avoid the internal portion of cabinet to soak and damage, thereby the factor of safety and the practicality of this low voltage distribution cabinet have been improved, through first operational amplifier among the temperature measurement circuit, second operational amplifier and third operational amplifier carry out multistage amplification to the signal, thereby guarantee the accuracy nature that detects the signal, rethread adjustable resistance amplifies the regulation to the signal, prevent that the signal from spilling over, the reliability of temperature measurement has been improved.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic structural view of a safe and reliable low-voltage power distribution device for an electrical network according to the present invention;

figure 2 is a cross-sectional view of the support box of the low voltage switchgear of the present invention for electrical networks that is safe and reliable;

fig. 3 is a schematic structural view of the ventilation mechanism of the low voltage switchgear for electrical network of the present invention;

FIG. 4 is an enlarged view of portion A of FIG. 3;

fig. 5 is a schematic circuit diagram of the temperature measurement circuit of the low voltage switchgear of the present invention for electrical network safety and reliability;

in the figure: 1. the refrigerator comprises a base, 2. an installation block, 3. a cabinet body, 4. a cabinet door, 5. a door handle, 6. a display screen, 7. a key, 8. an electric meter, 9. a support box, 10. a support frame, 11. a support plate, 12. a fixed block, 13. a translation block, 14. an expansion bracket, 15. a sliding block, 16. a sliding frame, 17. a ventilation pipe, 18. a transverse pipe, 19. an air valve, 20. a vertical pipe, 21. an electric heating wire, 22. a fan, 23. filter cotton, 24. a first motor, 25. a screw rod, 26. a pressure gauge, 27. a vertical rod, 28. a circular ring, 29. a support rod, 30. a hygrometer, 31. a flowmeter, 32. a sealing plate, 33. a second motor, 34. a wire coil, 35. a pull rope, 36. a support, 37. a guide wheel, 38. a third motor, 39. a driving rod, 40. a driven rod, 41. a flat plate, 42. a spring, 43. a reciprocating block.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.

As shown in fig. 1, a safe and reliable low-voltage power distribution device for an electrical network comprises a base 1, an installation block 2, a cabinet body 3, a cabinet door 4, two support mechanisms and two ventilators 22, wherein the installation block 2 is arranged above the base 1, the cabinet body 3 is fixed above the installation block 2, the cabinet door 4 is arranged on the cabinet body 3, the cabinet door 4 is provided with a door handle 5, a display screen 6, a plurality of keys 7 and a plurality of electric meters 8, the cabinet body 3 is internally provided with a PLC, the keys 7, the display screen 6 and the electric meters 8 are all electrically connected with the PLC, the two support mechanisms are respectively positioned at two sides of the cabinet body 3, the two ventilators 22 are positioned at two sides of the cabinet body 3, and the installation block 2 is internally provided with a;

when the low-voltage power distribution cabinet is used outdoors, the base 1 is fixedly installed on the ground, the cabinet body 3 is supported by the supporting mechanism, the ventilators 22 on two sides of the cabinet body 3 are used for realizing the exchange of air inside and outside the cabinet body 3 to achieve the purpose of heat dissipation and cooling inside the cabinet body 3, each electric power information of an electric system is measured by the ammeter 8 on the cabinet door 4 of the cabinet body 3, the electric information is displayed by the display screen 6, the display content of the display screen 6 can be switched by the buttons 7, so that a worker can conveniently check the power distribution information, when urban inland inundation occurs, under the condition of road surface ponding, because the cavity is arranged inside the mounting block 2, the ponding generates buoyancy on the mounting block 2, the mounting block 2 generates upward supporting force on the cabinet body 3, the supporting force of the supporting mechanism on the cabinet body 3 is reduced, the supporting mechanism is convenient to drive the cabinet body, prevent that the switch board from damaging.

As shown in fig. 1-2, the supporting mechanism includes a supporting box 9, a supporting frame 10, a lifting assembly and a supporting plate 11, the supporting box 9 is disposed downward, the supporting box 9 is fixed on the cabinet body 3, one end of the supporting frame 10 is fixed on the supporting box 9, the other end of the supporting frame 10 abuts against the base 1, the lifting assembly and the supporting plate 11 are both located in the supporting box 9, the lifting assembly is in transmission connection with the supporting plate 11, the lifting assembly includes a driving unit, a fixing block 12, a translation block 13, an expansion bracket 14, a slider 15 and a sliding frame 16, the driving unit is in transmission connection with the translation block 13, the fixing block 12 is fixed at the bottom of the supporting box 9, two sides of the bottom end of the expansion bracket 14 are respectively hinged with the slider 15 and the supporting plate 11, two sides of the top end of the expansion bracket 14 are respectively hinged with the fixing block 12 and the translation block 13, the sliding frame 16 is U-shaped, two ends of the sliding frame 16 are fixed above the supporting plate 11, and the sliding block 15 is sleeved on the sliding frame 16;

in the supporting mechanism, a supporting box 9 is fixed on a cabinet body 3, one end of a supporting frame 10 fixed on the supporting box 9 is propped against a base 1, thereby supporting the cabinet body 3 through the supporting box 9, driving the supporting plate 11 to move downwards through the lifting component in the supporting box 9, leading the supporting plate 11 to be propped against the base 1, when waterlogging occurs, the lifting component continues to operate, the PLC controls the driving unit to operate, so that the translation block 13 translates, the distance between the translation block 13 and the fixed block 12 is reduced, so that the length of the telescopic frame 14 is increased, the bottom end of the telescopic frame 14, the slider 15 slides along the sliding frame 16, due to the length increase of the telescopic frame 14, the telescopic frame 14 jacks up the supporting box 9 to move upwards, and drive 3 rebound of the cabinet body for the cabinet body 3 is kept away from ponding, prevents that the facility in the cabinet body 3 from receiving the destruction of ponding, guarantees the switch board safe operation.

As shown in fig. 3-4, the ventilation unit 22 includes a ventilation pipe 17, a horizontal pipe 18 and two ventilation assemblies, one end of the ventilation pipe 17 is communicated with the cabinet 3, the other end of the ventilation pipe 17 is communicated with the upper side of the center of the horizontal pipe 18, the two ventilation assemblies are respectively located below two ends of the horizontal pipe 18, an air valve 19 is disposed in the ventilation pipe 17, the ventilation assembly includes a vertical pipe 20, a sealing unit and a ventilation unit, the top end of the vertical pipe 20 is communicated with the horizontal pipe 18, the sealing unit is disposed at the bottom end of the vertical pipe 20, the ventilation unit is located in the vertical pipe 20, the ventilation unit sequentially includes an electric heating wire 21, a fan 22, a dredging assembly and a filter cotton 23 from top to bottom, the electric heating wire 21, the fan 22 and the filter cotton 23 are all fixed in the vertical pipe 20, and the air valve 19, the electric.

In the ventilator 22 mechanism, the external air and the air in the cabinet 3 can exchange through the ventilation pipe 17, the horizontal pipe 18 and one of the two vertical pipes 20, which is convenient for heat dissipation and cooling of the inside of the cabinet 3, the vertical pipe 20 can be controlled to open and close by using the sealing unit, the PLC controls one of the two vertical pipes 20 to open in communication with the outside, the other vertical pipe 20 is closed, when ventilation is performed, the blower 22 is started to introduce the external air, when the external air enters the horizontal pipe 18 from the vertical pipe 20, the dust in the air is filtered through the filter cotton 23, and the moisture in the air is absorbed, when the filter cotton 23 is blocked, the PLC controls the dredging component to start, so that the filter cotton 23 shakes to shake off the absorbed dust, when the moisture absorbed by the filter cotton 23 is too much, the humidity of the air entering the cabinet 3 is too high, the PLC controls the air valve 19 to close, and then the vertical pipes 20 are opened when the two sealing, the fan 22 starts, heating wire 21 circular telegram simultaneously for inside outside air passes through one of them standpipe 20, utilize the circular telegram of heating wire 21 to produce the heat and transmit the heat to the air, make the air intensification back, flow to the outside of standpipe 20 from another standpipe 20 inside, the moisture that filter pulp 23 absorbed in this standpipe 20 is too much, make through hot air and dry filter pulp 23, resume water absorption capacity, and then air valve 19 opens, standpipe 20 is blockked up to the sealing unit in one of them standpipe 20 in two standpipe 20, make ventilation blower 22 construct and can continue to let in the lower air of dry temperature to the cabinet body 3.

As shown in fig. 5, a temperature measuring module is disposed in the cabinet 3, the temperature measuring module includes a temperature measuring circuit, the temperature measuring circuit includes a first operational amplifier U1, a second operational amplifier U2, a third operational amplifier U3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first adjustable resistor Rp1, a second adjustable resistor Rp2, and a third adjustable resistor Rp3, an inverting input terminal of the first operational amplifier U1 is connected to the first capacitor C1, a non-inverting input terminal of the first operational amplifier U1 is grounded via the first resistor R1, a non-inverting input terminal of the first operational amplifier U1 is connected to an output terminal of the first operational amplifier U1 via the second resistor R2, an adjustable resistor U1 is grounded to the output terminal 1, an adjustable end of the first adjustable resistor Rp1 is connected with an output end of a first operational amplifier U1, an output end of the first operational amplifier U1 is connected with an inverting input end of a second operational amplifier U2 through a series circuit composed of a third resistor R3 and a fourth resistor R4, an inverting input end of the second operational amplifier U2 is grounded through a third capacitor C3, a non-inverting input end of the second operational amplifier U2 is connected with an inverting input end of a third operational amplifier U3 through a series circuit composed of a second capacitor C2 and a fifth resistor R5 respectively through a third resistor R3 and a fourth resistor R4, an output end of the second operational amplifier U2 is connected with an inverting input end of the third operational amplifier U3 through a sixth resistor R6, an inverting input end of the third operational amplifier U3 is connected with an output end of the third operational amplifier U3 through a third adjustable resistor Rp3, an adjustable end of the third resistor Rp3 is connected with an output end of a third operational amplifier U3, the non-inverting input terminal of the third operational amplifier U3 is grounded through a second adjustable resistor Rp2, and the adjustable terminal of the second adjustable resistor Rp2 is connected to the non-inverting input terminal of the third operational amplifier U3.

The temperature measuring module measures temperature, and in the temperature measuring circuit, signals are amplified in three stages through amplifying circuits formed by a first operational amplifier U1, a second operational amplifier U2 and a third operational amplifier U3 respectively, so that the accuracy of signal detection is guaranteed; the first adjustable resistor Rp1, the second adjustable resistor Rp2 and the third adjustable resistor Rp3 are used for adjusting signal amplification, signal overflow is prevented, and reliability of temperature measurement is improved.

As shown in fig. 2, the driving unit includes a first motor 24 and a screw 25, the first motor 24 is fixed at the bottom of the support box 9, the first motor 24 is electrically connected to the PLC, the first motor 24 is in transmission connection with one end of the screw 25, the other end of the screw 25 is arranged in the fixed block 12, the translation block 13 is sleeved on the screw 25, and a screw thread matching with the screw 25 is arranged at a connection position of the translation block 13 and the screw 25.

The PLC controls the first motor 24 to be started, the screw rod 25 is driven to rotate under the supporting effect of the fixing block 12, and the screw rod 25 acts on the translation block 13 through threads, so that the translation block 13 moves along the axis of the screw rod 25.

Preferably, in order to detect whether the support plate 11 is in contact with the ground, a pressure gauge 26 is provided in the support plate 11, and the pressure gauge 26 is electrically connected to the PLC. Along with lifting unit drives backup pad 11 downstream, backup pad 11 contacts behind the ground, pressure gauge 26 detects pressure data, and give PLC with pressure data transmission, PLC confirms backup pad 11 and ground contact, when having ponding on base 1, because installation piece 2 provides the ascending holding power of the cabinet body 3, make the effort between backup pad 11 and the base 1 reduce, PLC control lifting unit starts, make the cabinet body 3 rise and break away from ponding, backup pad 11 and the 1 diameter of base keep stable pressure simultaneously, avoid the internal portion of cabinet body 3 to soak and damage.

Preferably, in order to realize the stable lifting movement of the cabinet 3, the supporting mechanism further comprises a vertical rod 27 and a circular ring 28, the vertical rod 27 is fixed above the base 1, the circular ring 28 is fixedly connected with the supporting box 9, and the circular ring 28 is sleeved on the vertical rod 27. The moving direction of the circular ring 28 is fixed through the vertical rod 27 fixed on the base 1, and the circular ring 28 is fixedly connected with the cabinet body 3, so that the cabinet body 3 can stably lift and move.

Preferably, in order to prevent the mounting block 2 from deforming, a strut 29 is arranged in the cavity, and the bottom end and the top end of the strut 29 are fixedly connected with the bottom and the top in the mounting block 2 respectively. The top of the mounting block 2 is supported by the support rod 29, so that the mounting block 2 is prevented from being greatly deformed by the pressure of the cabinet 3.

Preferably, in order to detect the humidity and the flow rate of the air introduced into the cabinet 3, a hygrometer 30 and a flow meter 31 are arranged in the ventilation pipe 17, and both the hygrometer 30 and the flow meter 31 are electrically connected with the PLC. Utilize hygrometer 30 and flowmeter 31 to detect the humidity and the flow that let in the air in the cabinet body 3 respectively to give PLC with humidity data and flow data transfer, when PLC detected the flow less, show that filter pulp 23 takes place to block up, PLC control mediation subassembly starts this moment, will filter the dust on the pulp 23 and shake off, when the air humidity is great, PLC control air valve 19 closes, and start heating wire 21, be convenient for dry filter pulp 23, make filter pulp 23 resume drying performance.

As shown in fig. 4, the sealing unit includes a sealing plate 32, a second motor 33, a wire coil 34, a pulling rope 35 and a bracket 36, the second motor 33 is fixed below the transverse tube 18, the second motor 33 is electrically connected to the PLC, the second motor 33 is in transmission connection with the wire coil 34, the wire coil 34 is connected to one end of the sealing plate 32 through the pulling rope 35, the sealing plate 32 covers the bottom end of the vertical tube 20, one end of the bracket 36 is hinged to one end of the sealing plate 32, which is far away from the pulling rope 35, and the other end of the bracket 36 is fixedly connected to the vertical tube 20.

PLC control second motor 33 starts, drives the drum 34 and rotates for stay cord 35 tightens up or relaxs, and when stay cord 35 tightened up, closing plate 32 upwards rotated, blockked up the bottom of standpipe 20, thereby closed standpipe 20, when stay cord 35 loosened, closing plate 32 rotated downwards, thereby made standpipe 20 open, was convenient for ventilate.

Preferably, in order to avoid wear of the pull cord 35, the sealing unit further comprises a guide wheel 37, the guide wheel 37 being arranged on the side of the stand pipe 20 remote from the bracket 36, the pull cord 35 abutting against the guide wheel 37. The guide wheel 37 prevents the pull rope 35 from being worn due to sliding friction between the pull rope 35 and the vertical pipe 20, thereby prolonging the service life of the pull rope 35.

As shown in fig. 4, the dredging assembly comprises a third motor 38, a driving rod 39, a driven rod 40, a plate 41 and a plurality of dredging units, wherein the third motor 38 is fixed in the standpipe 20, the third motor 38 is electrically connected with the PLC, the third motor 38 is in transmission connection with the driving rod 39, the driving rod 39 is hinged with the plate 41 through the driven rod 40, the dredging units are uniformly distributed below the plate 41, the dredging units comprise springs 42 and reciprocating blocks 43, and the reciprocating blocks 43 are arranged below the plate 41 through the springs 42.

The PLC controls the third motor 38 to start, drives the driving rod 39 to do circular motion, simultaneously, the driving rod 39 acts on the flat plate 41 through the driven rod 40, the reciprocating block 43 is driven to move up and down through the spring 42 below the flat plate 41, the filter cotton 23 is knocked, and therefore dust on the filter cotton 23 is knocked off, and the dredging function is achieved.

Preferably, in order to realize the stable movement of the flat plate 41, a limiting ring 44 and a limiting rod 45 are arranged above two ends of the flat plate 41, the limiting rod 45 is fixed above the flat plate 41, the limiting ring 44 is sleeved on the limiting rod 45, and the limiting ring 44 is fixed on the inner wall of the vertical pipe 20. The movement direction of the limiting rod 45 is fixed by the limiting ring 44 fixed in the vertical pipe 20, and the limiting rod 45 is fixed above the flat plate 41, so that when the flat plate 41 moves, the flat plate 41 can stably move up and down along the fixed direction.

This low voltage distribution device moves, 22 the purpose that realizes heat dissipation aeration cooling through the ventilation blower of the 3 both sides of the cabinet body constructs, 22 in the ventilation blower constructs, can carry out drying and dust removal to the air that gets into the cabinet body 3 through the filter pulp 23 in the standpipe 20, utilize the mediation subassembly to shake off the dust on the filter pulp 23, through heating wire 21, fan 22 and air valve 19 can be dried filter pulp 23, guarantee that filter pulp 23 has the dry dust removal function that lasts, moreover, when there is ponding base 1 top, installation piece 2 provides 3 ascending holding power of the cabinet body, lifting unit in the both sides supporting box 9 starts simultaneously, jack-up supporting box 9 rebound, make cabinet body 3 keep away from ponding, avoid the interior soaking of cabinet body 3 to lead to equipment to damage, thereby this low voltage distribution device's factor of safety has been improved.

Compared with the prior art, this a safe and reliable's low voltage distribution device for electric network passes through ventilation blower 22 and constructs can make things convenient for the internal and external air of the cabinet body 3 to exchange, cool down the heat dissipation, and can remove dust the drying to the air that gets into the internal 3 of cabinet, prevent that the internal humidity of cabinet is too big, moreover, can support cabinet body 3 rebound through supporting mechanism, drive cabinet body 3 and keep away from ponding when taking place the waterlogging, avoid the internal portion of cabinet to soak and damage, thereby this low voltage distribution cabinet's factor of safety and practicality have been improved, through first operational amplifier among the temperature measurement circuit, second operational amplifier and third operational amplifier carry out multistage enlargies to the signal, thereby guarantee the accuracy nature to signal detection, rethread adjustable resistance amplifies the regulation to the signal, prevent that the signal from overflowing, temperature measurement's reliability has been improved.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (10)

1. A safe and reliable low-voltage distribution device for an electrical network is characterized by comprising a base (1), a mounting block (2), a cabinet body (3), a cabinet door (4), two supporting mechanisms and two ventilator mechanisms (22), the mounting block (2) is arranged above the base (1), the cabinet body (3) is fixed above the mounting block (2), the cabinet door (4) is arranged on the cabinet body (3), a door handle (5), a display screen (6), a plurality of keys (7) and a plurality of electric meters (8) are arranged on the cabinet door (4), the intelligent cabinet is characterized in that a PLC is arranged in the cabinet body (3), the keys (7), the display screen (6) and the electric meter (8) are electrically connected with the PLC, the two supporting mechanisms are respectively positioned on two sides of the cabinet body (3), the two ventilators (22) are respectively positioned on two sides of the cabinet body (3), and a cavity is arranged in the mounting block (2);

the supporting mechanism comprises a supporting box (9), a supporting frame (10), a lifting assembly and a supporting plate (11), wherein the supporting box (9) is arranged downwards, the supporting box (9) is fixed on the cabinet body (3), one end of the supporting frame (10) is fixed on the supporting box (9), the other end of the supporting frame (10) is abutted against the base (1), the lifting assembly and the supporting plate (11) are both positioned in the supporting box (9), the lifting assembly is in transmission connection with the supporting plate (11), the lifting assembly comprises a driving unit, a fixed block (12), a translation block (13), an expansion bracket (14), a sliding block (15) and a sliding frame (16), the driving unit is in transmission connection with the translation block (13), the fixed block (12) is fixed at the bottom in the supporting box (9), two sides of the bottom end of the expansion bracket (14) are respectively hinged with the sliding block (15) and the supporting plate (11), two sides of the top end of the telescopic frame (14) are respectively hinged with the fixed block (12) and the translation block (13), the sliding frame (16) is U-shaped, two ends of the sliding frame (16) are fixed above the supporting plate (11), and the sliding block (15) is sleeved on the sliding frame (16);

the ventilator (22) comprises a ventilation pipe (17), a transverse pipe (18) and two ventilation assemblies, one end of the ventilation pipe (17) is communicated with the cabinet body (3), the other end of the ventilation pipe (17) is communicated with the upper part of the center of the transverse pipe (18), the two ventilation assemblies are respectively positioned below the two ends of the transverse pipe (18), an air valve (19) is arranged in the ventilation pipe (17), each ventilation assembly comprises a vertical pipe (20), a sealing unit and a ventilation unit, the top end of the vertical pipe (20) is communicated with the transverse pipe (18), the sealing unit is arranged at the bottom end of the vertical pipe (20), the ventilation unit is positioned in the vertical pipe (20), each ventilation unit sequentially comprises an electric heating wire (21), a fan (22), a dredging assembly and filter cotton (23) from top to bottom, the electric heating wire (21), the fan (22) and the filter cotton (23) are all fixed in the vertical pipe (20), the air valve (19), the electric heating wire (21) and the fan (22) are all electrically connected with the PLC;

a temperature measuring module is arranged in the cabinet body (3), the temperature measuring module comprises a temperature measuring circuit, the temperature measuring circuit comprises a first operational amplifier U1, a second operational amplifier U2, a third operational amplifier U3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first adjustable resistor Rp1, a second adjustable resistor Rp2 and a third adjustable resistor Rp3, the inverting input end of the first operational amplifier U1 is connected with the first capacitor C1, the non-inverting input end of the first operational amplifier U1 is grounded through the first resistor R1, the non-inverting input end of the first operational amplifier U1 is connected with the output end of the first operational amplifier U1 through the second resistor Rp2, the output end of the first operational amplifier U1 is grounded through the first adjustable resistor Rp1, an adjustable end of the first adjustable resistor Rp1 is connected with an output end of a first operational amplifier U1, an output end of the first operational amplifier U1 is connected with an inverting input end of a second operational amplifier U2 through a series circuit composed of a third resistor R3 and a fourth resistor R4, an inverting input end of the second operational amplifier U2 is grounded through a third capacitor C3, a non-inverting input end of the second operational amplifier U2 is connected with an inverting input end of a third operational amplifier U3 through a series circuit composed of a second capacitor C2 and a fifth resistor R5 respectively through a third resistor R3 and a fourth resistor R4, an output end of the second operational amplifier U2 is connected with an inverting input end of the third operational amplifier U3 through a sixth resistor R6, an inverting input end of the third operational amplifier U3 is connected with an output end of the third operational amplifier U3 through a third adjustable resistor Rp3, an adjustable end of the third resistor Rp3 is connected with an output end of a third operational amplifier U3, the non-inverting input terminal of the third operational amplifier U3 is grounded through a second adjustable resistor Rp2, and the adjustable terminal of the second adjustable resistor Rp2 is connected to the non-inverting input terminal of the third operational amplifier U3.

2. The safe and reliable low-voltage distribution device for the electrical network according to claim 1, wherein the driving unit comprises a first motor (24) and a screw (25), the first motor (24) is fixed at the bottom inside the supporting box (9), the first motor (24) is electrically connected with the PLC, the first motor (24) is in transmission connection with one end of the screw (25), the other end of the screw (25) is arranged inside the fixing block (12), the translation block (13) is sleeved on the screw (25), and the connection part of the translation block (13) and the screw (25) is provided with a thread matched with the screw (25).

3. A safe and reliable low voltage switchgear for electrical networks according to claim 1 characterized in that a pressure gauge (26) is provided inside the support plate (11), said pressure gauge (26) being electrically connected to the PLC.

4. A safe and reliable low voltage distribution device for electrical networks according to claim 1, characterized in that the support means further comprise a vertical bar (27) and a ring (28), the vertical bar (27) being fixed above the base (1), the ring (28) being fixedly connected to the support box (9), the ring (28) being fitted over the vertical bar (27).

5. A safe and reliable low-voltage distribution device for electrical networks according to claim 1, characterized in that a support bar (29) is arranged in the cavity, and the bottom end and the top end of the support bar (29) are fixedly connected with the bottom and the top in the mounting block (2), respectively.

6. A safe and reliable low voltage power distribution device for electrical networks according to claim 1, characterized in that a hygrometer (30) and a flow meter (31) are provided in the ventilation duct (17), both the hygrometer (30) and the flow meter (31) being electrically connected to the PLC.

7. The safe and reliable low-voltage distribution device for the electrical network according to claim 1, wherein the sealing unit comprises a sealing plate (32), a second motor (33), a wire coil (34), a pulling rope (35) and a bracket (36), the second motor (33) is fixed below the transverse pipe (18), the second motor (33) is electrically connected with the PLC, the second motor (33) is in transmission connection with the wire coil (34), the wire coil (34) is connected with one end of the sealing plate (32) through the pulling rope (35), the sealing plate (32) covers the bottom end of the vertical pipe (20), one end of the bracket (36) is hinged with one end of the sealing plate (32) far away from the pulling rope (35), and the other end of the bracket (36) is fixedly connected with the vertical pipe (20).

8. A safe and reliable low voltage power distribution device for electrical networks according to claim 7, characterized in that the sealing unit further comprises a guide wheel (37), the guide wheel (37) being arranged on the side of the riser pipe (20) remote from the bracket (36), the pulling rope (35) resting on the guide wheel (37).

9. The safe and reliable low-voltage switchgear for electrical networks according to claim 1, characterized in that the dredging assembly comprises a third motor (38), a driving rod (39), a driven rod (40), a plate (41) and several dredging units, the third motor (38) is fixed in the riser (20), the third motor (38) is electrically connected to the PLC, the third motor (38) is in transmission connection with the driving rod (39), the driving rod (39) is hinged to the plate (41) through the driven rod (40), the dredging units are evenly distributed under the plate (41), the dredging units comprise springs (42) and reciprocating blocks (43), and the reciprocating blocks (43) are arranged under the plate (41) through the springs (42).

10. A safe and reliable low-voltage power distribution unit for electrical networks according to claim 9, wherein a limiting ring (44) and a limiting rod (45) are arranged above two ends of the flat plate (41), the limiting rod (45) is fixed above the flat plate (41), the limiting ring (44) is sleeved on the limiting rod (45), and the limiting ring (44) is fixed on the inner wall of the vertical pipe (20).

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