CN113241931B - Frequency converter with multiple overload protection - Google Patents
Frequency converter with multiple overload protection Download PDFInfo
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- CN113241931B CN113241931B CN202110544374.XA CN202110544374A CN113241931B CN 113241931 B CN113241931 B CN 113241931B CN 202110544374 A CN202110544374 A CN 202110544374A CN 113241931 B CN113241931 B CN 113241931B
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- Prior art keywords
- circuit breaker
- breaker
- mounting table
- protective housing
- electrifying
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/041—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature additionally responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/047—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using a temperature responsive switch
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1203—Circuits independent of the type of conversion
- H02H7/1206—Circuits independent of the type of conversion specially adapted to conversion cells composed of a plurality of parallel or serial connected elements
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20909—Forced ventilation, e.g. on heat dissipaters coupled to components
- H05K7/20918—Forced ventilation, e.g. on heat dissipaters coupled to components the components being isolated from air flow, e.g. hollow heat sinks, wind tunnels or funnels
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention relates to the technical field of frequency converters and discloses a frequency converter with multiple overload protection, which comprises a protective shell, an ammeter, an air switch, a frequency conversion circuit board and a controller, wherein a support is fixedly arranged in the protective shell and is divided into an upper mounting table and a lower mounting table, a circuit breaker mounting table is fixedly arranged at the top end of the upper mounting table, and a temperature circuit breaker, an electromagnetic circuit breaker and a current circuit breaker are sequentially arranged at the top end of the circuit breaker mounting table. Through temperature circuit breaker, the break-make of the external output of converter can be controlled to one of them effect of electromagnetic circuit breaker and current breaker for whole converter receives multiple overload protection, and through temperature circuit breaker, electromagnetic circuit breaker and current breaker's combined action, output line need be in just can export outside under the connected state at above-mentioned three circuit breaker simultaneously, effectively prevent output line's overload, protect output circuit and with the normal work of electrical apparatus, and then effectively reduce secondary disaster's formation.
Description
Technical Field
The invention relates to the technical field of frequency converters, in particular to a frequency converter with multiple overload protection.
Background
The frequency converter is an electric control device which applies a frequency conversion technology and a microelectronic technology and controls an alternating current motor by changing the frequency mode of a working power supply of the motor. The frequency converter mainly comprises a rectifying unit, a filtering unit, an inverting unit, a braking unit, a driving unit, a detecting unit micro-processing unit and the like. The frequency converter adjusts the voltage and frequency of an output power supply by switching on and off an internal IGBT, provides the required power supply voltage according to the actual requirement of the motor, and further achieves the purposes of energy saving and speed regulation. With the continuous improvement of the industrial automation degree, the frequency converter is also widely applied.
The overload protection mechanism is usually arranged in the existing frequency converter, the protection of the existing electric appliance is very important, the power of the electric appliance can be effectively reduced through overload protection to overflow, under the condition of energy-saving effect, the electric appliance is effectively protected, the overload heating damage is prevented, the overload protection mechanism of the existing frequency converter has the problem of single structure, the overload protection judgment mode is single, the overload condition judgment is inaccurate due to the influence of the rated power of the electric appliance, and the overload protection failure is easily caused.
An effective solution to the problems in the related art has not been proposed yet.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the frequency converter with multiple overload protection, which has the advantages of multiple overload protection, effective protection of electrical appliances and the frequency converter, comprehensive judgment of overload conditions in multiple modes and the like, and solves the problems that the judgment mode of the overload conditions is single, the overload conditions are easily influenced by the electrical appliances, and the overload protection is easily failed.
(II) technical scheme
In order to solve the technical problems that the overload condition judgment mode is single, the overload condition judgment mode is easily influenced by electric appliances and overload protection failure is easily generated, the invention provides the following technical scheme: the utility model provides a converter with multiple overload protection, includes protecting sheathing, ampere meter, air switch, variable frequency circuit board and controller, the inside fixed support that is provided with of protecting sheathing, the support divide into upper mount table and lower floor's mount table, the fixed circuit breaker mount table that is provided with in upper mount table top, circuit breaker mount table top has set gradually temperature circuit breaker, electromagnetic circuit breaker and current breaker.
Preferably, temperature circuit breaker includes first shielding shell, two first rigid connection wires, two circular telegram brushes and central authorities and connects the electric pipe, two first rigid connection wires run through the entering respectively inside the first shielding shell, and first rigid connection wire symmetry sets up, the circular telegram brush sets up respectively first rigid connection wire is located the one end of the inside central authorities of first shielding shell, central authorities connect the electric pipe fixed the setting to be in the inside central authorities of first shielding shell, central authorities connect the electric pipe to be insulating material, the electric connection groove has been seted up to central authorities' electric pipe surface symmetry, the circular telegram brush with agree with between the electric connection groove, the circular telegram brush is inlayed respectively inside the electric connection groove, the inside activity of central authorities connect the electric pipe to be provided with the cavity metal ball, central authorities connect the positive central authorities of electric pipe to be provided with the glass observation window.
Preferably, alcohol is filled in the central power connection pipe and below the hollow metal ball, sealant is coated at each joint of the central power connection pipe, the hollow metal ball is arranged above the alcohol liquid level, the hollow metal ball is lifted through heated volatilization expansion of the alcohol, and the hollow metal ball is communicated with the first rigid connection leads at the two ends when being contacted with the power-on brushes at the two sides.
Preferably, electromagnetic circuit breaker includes second shielding shell, two second rigid connection wires, electro-magnet and movable binding post, two second rigid connection wire runs through the entering respectively inside the second shielding shell, and second rigid connection wire symmetry sets up, the electro-magnet comprises the iron core of central authorities and the coil in the outside, movable binding post one side is provided with the connecting rod, the one end that movable binding post was kept away from to the connecting rod is provided with the pivot, movable binding post with pass through between the second shielding shell the pivot is rotated and is connected, pivot central authorities are provided with guide spring, guide spring keeps away from the one end of pivot with communicate between the second shielding shell, movable binding post divide into iron outer lane and copper terminal.
Preferably, the coil is connected in series with a total output circuit of the frequency converter, the current passed by the coil is related to the total output power of the frequency converter, the size of the magnetism generated by the iron core is controlled by the size of the current passed by the coil, the iron outer ring is attracted by the size of the magnetism, so that the movable binding post generates displacement under the combined action of the rotating shaft and the guide spring, and the copper binding post is connected with the second rigid connecting wires at two ends when contacting with the second rigid connecting wires at two sides.
Preferably, the current circuit breaker comprises a third shielding shell, a third rigid connection lead, an ammeter and an air switch, wherein the third rigid connection lead completely penetrates through the third shielding shell, the ammeter and the air switch are sequentially arranged inside the third shielding shell and connected in series with the third rigid connection lead, the ammeter detects passing total current, and the air switch controls the on-off of the circuit according to the passing total current.
Preferably, upper mount table lower surface central authorities are provided with the rubber fixed slot, installation spout has been seted up to lower floor's mount table top central authorities, upper mount table with lower floor's mount table central authorities installation is provided with variable frequency circuit board, variable frequency circuit board activity sets up the installation spout with inside the rubber fixed slot, the rubber fixed slot will variable frequency circuit board is closely fixed.
Preferably, the protective housing is divided into a first protective housing and a second protective housing, the first protective housing and the second protective housing can be detached from each other, the first protective housing is provided with a plurality of power output interfaces, the top end of the first protective housing is provided with a controller, and four corners of the bottom of the second protective housing are provided with fixing bolts.
Preferably, the lower half protective housing openly is provided with the radiator mounting panel, the installation is provided with a plurality of radiator fan on the radiator mounting panel, the side of lower half protective housing is provided with ventilative board, ventilative hole has been seted up on the ventilative board.
Preferably, the controller respectively controls the on-off of the cooling fan, the controller is respectively electrically connected with the ammeter and the air switch, the controller can display the reading of the ammeter, and the controller can control the on-off of the air switch.
Preferably, the temperature circuit breaker, the electromagnetic circuit breaker and the current circuit breaker are all arranged in series, and the temperature circuit breaker, the electromagnetic circuit breaker and the current circuit breaker can control the on-off of the output line of the frequency converter.
(III) advantageous effects
Compared with the prior art, the invention provides a frequency converter with multiple overload protection, which has the following beneficial effects:
1. this kind of converter with multiple overload protection, through temperature circuit breaker, the break-make of the external output of converter can be controlled to one of them effect of electromagnetic circuit breaker and current breaker, make whole converter receive multiple overload protection, and through temperature circuit breaker, electromagnetic circuit breaker and current breaker's combined action, output line need be in just can outwards export under the connected state at above-mentioned three circuit breaker simultaneously, effectively prevent output line's overload, protect output circuit and with the normal work of electrical apparatus, and then effectively reduce secondary disaster's generation.
2. The frequency converter with multiple overload protection comprises a hollow metal ball, wherein the hollow metal ball is heated, volatilized and expanded to be converted into a hollow metal ball, the position of the hollow metal ball rises and falls through alcohol which is heated, volatilized and expanded and arranged in a central power connection pipe, when the whole frequency converter works, the temperature in the frequency converter is changed according to the power change of a circuit output by the frequency converter, in the process of slowly increasing the temperature, because the alcohol is heated, volatilized and expanded, the air pressure at the lower part of the hollow metal ball rises, the height of the hollow metal ball rises under the action of the air pressure, when the temperature is lower, the height of the top end of the alcohol is located in the height position range of power-on brushes at two sides, the hollow metal ball is in contact with the power-on brushes at two sides to connect the first rigid connecting wires at two ends, the circuit is communicated through a temperature circuit breaker, when the temperature reaches a certain higher temperature, the hollow metal ball rises and exceeds the height position range of the power-on brushes at two sides, make hollow metal ball no longer switch on the circular telegram brush of both sides for circuit disconnection through temperature circuit breaker, reach along with the inside temperature accumulation of converter and reach immediate disconnection output circuit, prevent that output overload from leading to the problem of electrical apparatus and converter damage easily, and prevent under temperature circuit breaker's effect that the heat that the inside continuous operation of converter was built up from leads to the problem of converter damage easily.
3. The frequency converter with multiple overload protection is characterized in that a movable binding post capable of generating displacement under stress is arranged, when the output power of the frequency converter is gradually increased, the current passing through a coil is also gradually increased, the magnetic property is generated under the combined action of an electrified coil and an iron core, the magnetic property attracts an iron outer ring to be acted by downward force, a connecting rod is downwards rotated and a guide spring is shortened, the whole movable binding post generates displacement downwards, when the output power of the frequency converter reaches a certain value, the current passing through the coil is also increased to a certain value, so that the copper binding post is separated from second rigid connecting wires at two sides, a circuit passing through an electromagnetic circuit breaker is disconnected, the circuit is immediately disconnected along with the increase of the outward output power of the frequency converter when the output power exceeds a certain output power, the overload protection is carried out, and the normal work of external electrical appliances is effectively protected, and secondary damage caused by overload of the whole circuit system is prevented.
4. This kind of converter with multiple overload protection, can detect the ampere meter that the circuit passes through the electric current and the air switch that can remote control through the setting, the controller is connected with electricity between ampere meter and the air switch respectively, the ampere meter detects the total current that passes through, the controller receives and shows and judge the back through the controller after coming from the electric current that the ampere meter measured, control air switch, make can be convenient for carry out output's adjustment through the control of controller again after the detection to the electric current, make the output power scope that can freely control the converter through the controller, and then reach the purpose of preventing overloading.
5. This kind of converter with multiple overload protection, inside sliding frequency conversion circuit board into the installation spout when the installation, rubber fixed slot through the rubber material carries out fixed to frequency conversion circuit board in, certain vibrations of self-resuming ability buffering through the rubber material itself, prevent colliding with of frequency conversion circuit board and lead to the damage of the electrical component above that, frequency conversion circuit board and controller after the installation is accomplished, temperature circuit breaker, be connected between electromagnetic circuit breaker and the current breaker, carry out frequency conversion control to the electric energy of exporting from the power output interface, reach frequency conversion output's effect.
6. This kind of converter with multiple overload protection carries out the loss of certain degree with the heat of the normal work output of converter through radiator fan and ventilative hole's effect to reduce the whole operating temperature of whole converter, and can carry out sensitive detection to the temperature through temperature circuit breaker 3, prevent effectively that the converter from overheating to destroy, prolong the life of converter.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic cross-sectional view of the present invention;
FIG. 3 is a schematic diagram of the overall explosion of the present invention;
FIG. 4 is a schematic perspective view of a stent according to the present invention;
fig. 5 is a schematic perspective view of the temperature circuit breaker according to the present invention;
fig. 6 is a schematic cross-sectional view of a temperature circuit breaker of the present invention;
fig. 7 is a schematic perspective view of an electromagnetic circuit breaker according to the present invention;
fig. 8 is a schematic perspective view of another operating state of the electromagnetic circuit breaker of the present invention;
fig. 9 is a schematic cross-sectional view of an electromagnetic circuit breaker of the present invention;
fig. 10 is a schematic perspective view of a current interrupter according to the present invention.
In the figure: 1. a protective housing; 11. an upper protective shell; 12. a lower protective shell; 13. a power output interface; 14. a fixing bolt; 15. a heat sink mounting plate; 16. a heat radiation fan; 17. a ventilation plate; 18. a ventilation hole; 2. a support; 21. an upper layer mounting table; 22. a lower layer mounting table; 23. a circuit breaker mounting table; 24. a rubber fixing groove; 25. installing a chute; 3. a temperature circuit breaker; 31. a first shield shell; 32. a first rigid connection lead; 33. electrifying the brush; 34. a central power connection pipe; 35. an electric connection groove; 36. a hollow metal ball; 37. a glass viewing window; 4. an electromagnetic circuit breaker; 41. a second shield shell; 42. a second rigid connection lead; 43. an electromagnet; 431. an iron core; 432. a coil; 44. a movable binding post; 441. a connecting rod; 442. a rotating shaft; 443. a guide spring; 444. an iron outer ring; 445. a copper binding post; 5. a current breaker; 51. a third shield shell; 52. a third rigid connection lead; 53. an ammeter; 54. an air switch; 6. a variable frequency circuit board; 7. and a controller.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As described in the background, the prior art is not sufficient, and in order to solve the above technical problems, the present application proposes a frequency converter with multiple overload protection.
Referring to fig. 1-10, a frequency converter with multiple overload protection includes a protective housing 1, an ammeter 53, an air switch 54, a frequency conversion circuit board 6 and a controller 7, wherein a support 2 is fixedly disposed inside the protective housing 1, the support 2 is divided into an upper mounting table 21 and a lower mounting table 22, a circuit breaker mounting table 23 is fixedly disposed at the top end of the upper mounting table 21, a temperature circuit breaker 3, an electromagnetic circuit breaker 4 and a current circuit breaker 5 are sequentially disposed at the top end of the circuit breaker mounting table 23, the temperature circuit breaker 3 includes a first shielding shell 31, two first rigid connecting wires 32, two conducting brushes 33 and a central power receiving tube 34, the two first rigid connecting wires 32 respectively penetrate into the first shielding shell 31, the first rigid connecting wires 32 are symmetrically disposed, the conducting brushes 33 are respectively disposed at one end of the first rigid connecting wires 32 located at the center inside the first shielding shell 31, the central electricity receiving pipe 34 is fixedly arranged in the center inside the first shielding shell 31, the central electricity receiving pipe 34 is made of an insulating material, the electricity receiving grooves 35 are symmetrically formed in the outer surface of the central electricity receiving pipe 34, the electricity conducting brushes 33 and the electricity receiving grooves 35 are matched, the electricity conducting brushes 33 are respectively embedded inside the electricity receiving grooves 35, hollow metal balls 36 are movably arranged inside the central electricity receiving pipe 34, and a glass observation window 37 is arranged in the center of the front surface of the central electricity receiving pipe 34, so that in the working process of the temperature circuit breaker 3, the temperature circuit breaker 3 is protected to a certain extent through the effect of the first shielding shell 31, the glass observation window 37 is maintained to judge the alcohol storage amount inside the central electricity receiving pipe 34, whether the central electricity receiving pipe can be switched on or off according to temperature control current is judged, and whether the temperature circuit breaker 3 needs to be replaced or not can be judged by a worker according to the judgment.
Furthermore, alcohol is filled in the central electricity-connecting tube 34 and below the hollow metal ball 36, sealing glue is coated on each joint of the central electricity-connecting tube 34, the hollow metal ball 36 is arranged above the liquid level of the alcohol, the hollow metal ball 36 is lifted through different heating of the alcohol, the hollow metal ball 36 is communicated with the first rigid connecting wires 32 at two ends when contacting with the electrifying brushes 33 at two sides, the arrangement of the sealing glue prevents the alcohol in the central electricity-connecting tube 34 from volatilizing to reduce the total amount, so as to prolong the service life of the temperature breaker 3, when the whole frequency converter works, the temperature in the frequency converter is changed according to the power change of a circuit output by the frequency converter, and in the process of slowly lifting the temperature, because the alcohol is heated, volatilized and expands, the air pressure at the lower part of the hollow metal ball 36 is lifted, the height of the hollow metal ball 36 is also lifted under the action of the air pressure, when the temperature is lower, the height of the top end of the alcohol is located in the height position range of the electrifying brushes 33 on the two sides, so that the hollow metal ball 36 is in contact with the electrifying brushes 33 on the two sides to connect the first rigid connecting wires 32 on the two ends, the circuit passing through the temperature circuit breaker 3 is communicated, when the temperature reaches a certain higher temperature, the hollow metal ball 36 rises to exceed the height position range of the electrifying brushes 33 on the two sides, the hollow metal ball 36 is not in conduction with the electrifying brushes 33 on the two sides, the circuit passing through the temperature circuit breaker 3 is disconnected, an output circuit can be immediately disconnected along with the temperature accumulation inside the frequency converter, the problem that the electrical appliance and the frequency converter are easily damaged due to output overload is prevented, and the problem that the frequency converter is easily damaged due to the fact that the inside of the frequency converter is continuously operated and overheated is prevented under the effect of the temperature circuit breaker 3. When the temperature returns to normal, the alcohol vapor is liquefied again, and the hollow metal ball 36 falls down again to conduct the energizing brushes 33 on both sides, thereby reconnecting the circuit.
Further, the electromagnetic circuit breaker 4 includes a second shielding case 41, two second rigid connecting wires 42, an electromagnet 43 and a movable terminal 44, wherein the two second rigid connecting wires 42 respectively penetrate into the second shielding case 41, the second rigid connecting wires 42 are symmetrically arranged, the electromagnet 43 is composed of a central iron core 431 and an outer coil 432, a connecting rod 441 is arranged at one side of the movable terminal 44, a rotating shaft 442 is arranged at one end of the connecting rod 441 far away from the movable terminal 44, the movable terminal 44 is rotatably connected with the second shielding case 41 through the rotating shaft 442, a guide spring 443 is arranged at the center of the rotating shaft 442, one end of the guide spring 443 far away from the rotating shaft 442 is communicated with the second shielding case 41, the movable terminal 44 is divided into an iron outer ring 444 and a copper terminal 445, the movable terminal 44 is in a stress balance state under the action of its own gravity and the elastic force of the guide spring 443, two second rigid connecting wires 42 symmetrically arranged are conducted through the copper post 445 of the movable post 44, so that the circuit through the electromagnetic circuit breaker 4 is communicated.
Further, the coil 432 is connected in series with the total output circuit of the frequency converter, the current passed by the coil 432 is related to the total output power of the frequency converter, the magnitude of the magnetic force generated by the iron core 431 is controlled by the magnitude of the current passed by the coil 432, the iron outer ring 444 is attracted by the magnitude of the magnetic force, so that the movable terminal 44 is displaced under the combined action of the rotating shaft 442 and the guide spring 443, the copper terminal 445 is contacted with the second rigid connecting wires 42 at two sides to connect the second rigid connecting wires 42 at two ends, when the output power of the frequency converter is gradually increased, the current passed by the coil 432 is gradually increased, the magnetic force is generated by the combined action of the energized coil 432 and the iron core 431, the iron outer ring 444 is attracted by the downward force, so that the connecting rod 441 rotates downward and the guide spring 443 is shortened, so that the whole movable terminal 44 is displaced downward until the output power of the frequency converter reaches a certain value, the current passing through the coil 432 is also increased to a certain value, so that the copper wiring terminal 445 is separated from the second rigid connecting wires 42 on two sides, the circuit passing through the electromagnetic circuit breaker 4 is disconnected, the purpose of preventing overload is achieved by exceeding a certain output power and immediately disconnecting the circuit along with the improvement of the outward output power of the frequency converter, the normal work of an external electric appliance is effectively protected, and secondary damage caused by overload of the whole circuit system is prevented.
Further, the current breaker 5 includes a third shielding case 51, a third rigid connection lead 52, an ammeter 53 and an air switch 54, the third rigid connection lead 52 completely penetrates through the third shielding case 51, the ammeter 53 and the air switch 54 are sequentially disposed inside the third shielding case 51 and are connected in series with the third rigid connection lead 52, the ammeter 53 detects a passing total current, and the air switch 54 controls the on/off of the circuit according to the passing total current, in practical use, the controller 7 is electrically connected with the ammeter 53 and the air switch 54 respectively, the controller 7 receives the current measured by the ammeter 53, displays and judges the current by the controller 7, controls the air switch 54, so that the output power can be conveniently adjusted by detecting the current and controlling the controller 7, the output power range of the frequency converter can be freely controlled by the controller 7, thereby achieving the purpose of overload prevention.
Furthermore, a rubber fixing groove 24 is arranged in the center of the lower surface of the upper layer installation platform 21, an installation sliding groove 25 is arranged in the center of the top end of the lower layer installation platform 22, a variable frequency circuit board 6 is arranged in the centers of the upper layer installation platform 21 and the lower layer installation platform 22, the variable frequency circuit board 6 is movably arranged in the installation sliding groove 25 and the rubber fixing groove 24, the rubber fixing groove 24 tightly fixes the variable frequency circuit board 6, thereby the variable frequency circuit board 6 slides into the installation sliding groove 25 when being installed through the protection of the rubber fixing groove 24, the variable frequency circuit board 6 is fixed through the rubber fixing groove 24, meanwhile, certain vibration is buffered through the self-recovery capability of the rubber material, the damage of the electrical elements on the variable frequency circuit board 6 caused by collision is prevented, and the variable frequency circuit board 6 is electrically connected with the controller 7, the temperature circuit breaker 3, the electromagnetic circuit breaker 4 and the current breaker 5 after the installation is completed, so as to carry out frequency conversion control on the electric energy output from the power output interface 13 and achieve the effect of frequency conversion output.
Further, the protective housing 1 is divided into an upper protective housing 11 and a lower protective housing 12, the upper protective housing 11 and the lower protective housing 12 can be detached and installed, the upper protective housing 11 is provided with a plurality of power output interfaces 13, the top end of the upper protective housing 11 is provided with the controller 7, four corners of the bottom end of the lower protective housing 12 are provided with fixing bolts 14, the whole frequency converter can be stably fixed at a certain position through the fixing bolts 14, and elements inside the frequency converter can be conveniently overhauled and replaced through the detachable upper protective housing 11 and the detachable lower protective housing 12, so that the operation of workers is facilitated.
Further, lower half protective housing 12 openly is provided with radiator mounting panel 15, the installation is provided with a plurality of radiator fan 16 on radiator mounting panel 15, the side of lower half protective housing 12 is provided with ventilative board 17, a plurality of ventilative holes 18 have been seted up on ventilative board 17, thereby make the effect through radiator fan 16 and ventilative hole 18 carry out the loss of certain degree with the heat of converter normal work output, in order to reduce the whole operating temperature of whole converter, and can carry out sensitive detection to the temperature through temperature circuit breaker 3, effectively prevent the overheated damage of converter, the life of extension converter.
Further, the controller 7 controls the start and stop of the cooling fan 16, the controller 7 is electrically connected with the ammeter 53 and the air switch 54, the reading of the ammeter 53 can be displayed through the controller 7, and the on-off of the air switch 54 can be controlled through the controller 7, in the actual use process, the electric elements on the frequency conversion circuit board 6 are controlled by the controller 7, the normal operation and the frequency conversion effect of the whole frequency converter can be controlled through the controller 7, and the applicability of the frequency converter is improved.
Further, temperature circuit breaker 3, electromagnetic circuit breaker 4 and current breaker 5 all establish ties and set up, and through temperature circuit breaker 3, electromagnetic circuit breaker 4 and current breaker 5 can control the break-make of converter output line, make through temperature circuit breaker 3, the break-make of the external output of converter can be controlled to electromagnetic circuit breaker 4 and current breaker 5 one of them effect, make whole converter receive multiple overload protection, and through temperature circuit breaker 3, electromagnetic circuit breaker 4 and current breaker 5's combined action, output line need be in just can export outside under the connected state at above-mentioned three circuit breaker simultaneously, effectively prevent the overload of output line, protect output circuit and with the normal work of electrical apparatus, and then effectively reduce secondary disaster's formation.
The working principle is as follows: when using, at first with external with connect respectively between a plurality of power output interface 13 that openly set up with first protective housing 11, frequency conversion effect and overload power are set for through controller 7, then control radiator fan 16 through controller 7 and start, the heat of output carries out certain degree loss with the normal work of converter through radiator fan 16 and ventilative hole 18 effect, with the whole operating temperature who reduces whole converter, protect the normal frequency conversion operation of the electric elements on frequency conversion circuit board 6, the electric elements on frequency conversion circuit board 6 is controlled by controller 7 equally, and then can control the normal operation and the frequency conversion effect of whole converter through controller 7, increase the suitability of converter.
When the whole frequency converter works, according to the power change of the circuit output by the frequency converter, the temperature in the frequency converter changes, in the process of slowly increasing the temperature, because the alcohol is heated, volatilized and expanded, the air pressure at the lower part of the hollow metal ball 36 rises, the height of the hollow metal ball 36 also rises under the action of the air pressure, when the temperature is lower, the height of the top end of the alcohol is positioned in the height position range of the electrifying brushes 33 at the two sides, so that the hollow metal ball 36 is in contact with the electrifying brushes 33 at the two sides to connect the first rigid connecting wires 32 at the two ends, the circuit passing through the temperature circuit breaker 3 is communicated, when the temperature reaches a certain higher temperature, the hollow metal ball 36 rises to exceed the height position range of the electrifying brushes 33 at the two sides, so that the hollow metal ball 36 is not in conduction with the electrifying brushes 33 at the two sides, and the circuit passing through the temperature breaker 3 is disconnected, so as to reach along with the inside temperature accumulation of converter reaches instantaneous disconnection output circuit, prevent that output overload from leading to the problem of electrical apparatus and converter damage easily to prevent the easy problem of damaging of converter that the overheated lead to of the inside continuous operation of converter under temperature circuit breaker 3's effect.
When the whole frequency converter works, the movable binding post 44 is in a stress balance state under the action of the gravity of the movable binding post 44, the magnetic force of the electromagnet 43 and the elastic force of the guide spring 443, two second rigid connecting leads 42 which are symmetrically arranged are conducted through a copper binding post 445 of the movable binding post 44, so that the circuit passing through the electromagnetic circuit breaker 4 is communicated, when the output power of the frequency converter is gradually increased, the current passing through the coil 432 is also gradually increased, the magnetism is generated under the combined action of the energized coil 432 and the iron core 431, the magnetic attraction iron outer ring 444 is acted by the downward force, the connecting rod 441 rotates downwards and the guide spring 443 is shortened, so that the whole movable binding post 44 generates displacement downwards, until the output power of the frequency converter reaches a certain value, the current passing through the coil 432 is also increased to a certain value, so that the copper binding post 445 is separated from the second rigid connecting leads 42 at two sides, make the circuit through electromagnetic circuit breaker 4 break off to reach along with the improvement of the outside output power of converter, surpass certain output power and break off the circuit at once, carry out the purpose of anti-overload, effectively protect the external normal work with electrical apparatus, prevent the secondary hazard that whole circuit system transships and produce.
When the whole frequency converter works, the ammeter 53 and the air switch 54 are sequentially arranged in the third shielding shell 51 and are connected with the third rigid connecting lead 52 in series, the ammeter 53 detects the passing total current, the air switch 54 controls the on-off of a circuit according to the passing total current, the controller 7 is electrically connected with the ammeter 53 and the air switch 54 respectively in actual use, the controller 7 receives the current measured by the ammeter 53 and controls the air switch 54 after the current is displayed and judged by the controller 7, so that the output power can be conveniently adjusted by controlling the controller 7 after the current is detected, the output power range of the frequency converter can be freely controlled by the controller 7, and the purpose of overload prevention is further achieved.
Because temperature circuit breaker 3, electromagnetic circuit breaker 4 and current breaker 5 all establish ties and set up, and through temperature circuit breaker 3, electromagnetic circuit breaker 4 and current breaker 5 can control the break-make of converter output line, make through temperature circuit breaker 3, the break-make of the external output of converter can be controlled to electromagnetic circuit breaker 4 and current breaker 5 one of them effect, make whole converter receive multiple overload protection, and through temperature circuit breaker 3, electromagnetic circuit breaker 4 and current breaker 5's combined action, output line need be in just can export outside under the connected state at above-mentioned three circuit breaker simultaneously, effectively prevent the overload of output line, protect output circuit and with the normal work of electrical apparatus, and then effectively reduce the generation of secondary disaster.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A converter with multiple overload protection, includes protecting sheathing (1), ampere meter (53), air switch (54), frequency conversion circuit board (6) and controller (7), its characterized in that: a support (2) is fixedly arranged in the protective shell (1), the support (2) is divided into an upper mounting table (21) and a lower mounting table (22), a breaker mounting table (23) is fixedly arranged at the top end of the upper mounting table (21), and a temperature breaker (3), an electromagnetic breaker (4) and a current breaker (5) are sequentially arranged at the top end of the breaker mounting table (23); the temperature circuit breaker (3), the electromagnetic circuit breaker (4) and the current circuit breaker (5) are all arranged in series, and the on-off of an output line of the frequency converter can be controlled through the temperature circuit breaker (3), the electromagnetic circuit breaker (4) and the current circuit breaker (5);
the temperature circuit breaker (3) comprises a first shielding shell (31), two first rigid connecting wires (32), two electrifying brushes (33) and a central electrifying pipe (34), wherein the two first rigid connecting wires (32) penetrate into the interior of the first shielding shell (31) respectively, the first rigid connecting wires (32) are symmetrically arranged, the electrifying brushes (33) are arranged at one ends of the first rigid connecting wires (32) which are positioned at the center of the interior of the first shielding shell (31), the central electrifying pipe (34) is fixedly arranged at the center of the interior of the first shielding shell (31), the central electrifying pipe (34) is made of an insulating material, electrifying grooves (35) are symmetrically formed in the outer surface of the central electrifying pipe (34), the electrifying brushes (33) are combined with the electrifying grooves (35), and the electrifying brushes (33) are inlaid in the electrifying grooves (35) respectively, a hollow metal ball (36) is movably arranged in the central power receiving tube (34), and a glass observation window (37) is arranged in the center of the front surface of the central power receiving tube (34);
alcohol is filled in the central power connection pipe (34) and below the hollow metal ball (36), and sealing glue is coated at each joint of the central power connection pipe (34);
the electromagnetic circuit breaker (4) comprises a second shielding shell (41), two second rigid connecting wires (42), an electromagnet (43) and a movable binding post (44), wherein the two second rigid connecting wires (42) respectively penetrate into the second shielding shell (41), the second rigid connecting wires (42) are symmetrically arranged, the electromagnet (43) consists of a central iron core (431) and an outer coil (432), one side of the movable binding post (44) is provided with a connecting rod (441), one end, far away from the movable binding post (44), of the connecting rod (441 is provided with a rotating shaft (442), the movable binding post (44) is rotatably connected with the second shielding shell (41) through the rotating shaft (442), the center of the rotating shaft (442) is provided with a guide spring (443), one end, far away from the rotating shaft (442), of the guide spring (443) is communicated with the second shielding shell (41), the movable binding post (44) comprises an iron outer ring (444) and a copper binding post (445);
the coil (432) is connected with the total output circuit of the frequency converter in series, and the copper binding post (445) is in contact with the second rigid connecting lead (42) on two sides;
the current breaker (5) comprises a third shielding shell (51), a third rigid connecting lead (52), an ammeter (53) and an air switch (54), wherein the third rigid connecting lead (52) completely penetrates through the third shielding shell (51), the ammeter (53) and the air switch (54) are sequentially arranged inside the third shielding shell (51) and are connected in series with the third rigid connecting lead (52), the ammeter (53) detects the passing total current, and the air switch (54) controls the on-off of a circuit according to the passing total current.
2. A frequency converter with multiple overload protection according to claim 1, characterized in that: upper mounting table (21) lower surface central authorities are provided with rubber fixed slot (24), installation spout (25) have been seted up to lower floor's mounting table (22) top central authorities, upper mounting table (21) with lower floor's mounting table (22) central authorities installation is provided with frequency conversion circuit board (6), frequency conversion circuit board (6) activity sets up installation spout (25) with inside rubber fixed slot (24), rubber fixed slot (24) will frequency conversion circuit board (6) are closely fixed.
3. A frequency converter with multiple overload protection according to claim 2, characterized in that: protective housing (1) divide into first protective housing (11) and lower half protective housing (12), first protective housing (11) with can carry out the dismouting separation between lower half protective housing (12), first protective housing (11) openly are provided with a plurality of power output interfaces (13), first protective housing (11) top is provided with controller (7), the bottom four corners of lower half protective housing (12) all is provided with gim peg (14).
4. A frequency converter with multiple overload protection according to claim 3, characterized in that: the lower half protective housing (12) openly is provided with radiator mounting panel (15), the installation is provided with a plurality of radiator fan (16) on radiator mounting panel (15), the side of lower half protective housing (12) is provided with ventilative board (17), ventilative board (17) are last to have seted up a plurality of ventilative holes (18), controller (7) control respectively the start-stop of radiator fan (16), controller (7) respectively with ampere meter (53) with electricity is connected between air switch (54), through controller (7) can show the reading of ampere meter (53), and pass through controller (7) can control the break-make of air switch (54).
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| CN202110544374.XA CN113241931B (en) | 2021-05-19 | 2021-05-19 | Frequency converter with multiple overload protection |
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| CN202110544374.XA CN113241931B (en) | 2021-05-19 | 2021-05-19 | Frequency converter with multiple overload protection |
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| CN113241931B true CN113241931B (en) | 2022-06-14 |
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| US8786991B1 (en) * | 2012-09-26 | 2014-07-22 | The United States Of America As Represented By The Secretary Of The Navy | Automated three phase power monitoring system |
| CN209217930U (en) * | 2018-12-03 | 2019-08-06 | 石狮市瑞力机械科技有限公司 | A kind of frequency converter having circuit protection function |
| CN111785564B (en) * | 2020-07-09 | 2022-07-12 | 河南智开智能科技有限公司 | Novel protection type permanent magnetism vacuum circuit breaker |
| CN213185493U (en) * | 2020-09-01 | 2021-05-11 | 新优(宁波)智能科技有限公司 | Overload alarm system of circuit breaker |
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Effective date of registration: 20220509 Address after: 210000 room 47-102, No. 1001, Fuying Road, Jiangning District, Nanjing City, Jiangsu Province Applicant after: Nanjing ruituo Electric Co.,Ltd. Address before: 510000 No. 68, Fengguang Road, Zhongxin Town, Zengcheng, Guangzhou, Guangdong Applicant before: Qi Zheng |
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