CN117650396B - Fault protection device for frequency converter - Google Patents

Fault protection device for frequency converter Download PDF

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Publication number
CN117650396B
CN117650396B CN202410122252.5A CN202410122252A CN117650396B CN 117650396 B CN117650396 B CN 117650396B CN 202410122252 A CN202410122252 A CN 202410122252A CN 117650396 B CN117650396 B CN 117650396B
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CN
China
Prior art keywords
electrically connected
frequency converter
relay
main body
alternating current
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Application number
CN202410122252.5A
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Chinese (zh)
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CN117650396A (en
Inventor
殷向阳
甘魁东
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Shenzhen Lensail Technology Co ltd
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Shenzhen Lensail Technology Co ltd
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Priority to CN202410122252.5A priority Critical patent/CN117650396B/en
Publication of CN117650396A publication Critical patent/CN117650396A/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/62—Means for facilitating engagement or disengagement of coupling parts or for holding them in engagement
    • H01R13/639—Additional means for holding or locking coupling parts together, after engagement, e.g. separate keylock, retainer strap
    • 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
    • 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
    • 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
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Rectifiers (AREA)

Abstract

The invention relates to the related technical field of frequency converters, and particularly provides a fault protection device for a frequency converter, which comprises a frequency converter main body, wherein a plurality of groups of wiring seats are arranged on the upper surface of the frequency converter main body, fixing pieces are arranged on the outer walls of two sides of the frequency converter main body and near the upper position, an outer casing is fixedly arranged above the outer side of the frequency converter main body, a connecting seat is fixedly arranged at the rear end of one side of the outer casing, and a wire clamping ventilation piece corresponding to the wiring seat is arranged on the outer side of the connecting seat.

Description

Fault protection device for frequency converter
Technical Field
The invention relates to the technical field of frequency converters, and particularly provides a fault protection device for a frequency converter.
Background
The frequency converter mainly comprises a rectifying unit (alternating current to direct current), a filtering unit, an inverting unit (direct current to alternating current), a braking unit, a driving unit, a detecting unit micro-processing unit and the like. The frequency converter is used for adjusting the voltage and frequency of the output power supply by switching on and off the internal IGBT, and providing the required power supply voltage according to the actual requirement of the motor, so as to achieve the purposes of energy saving and speed regulation. Along with the continuous improvement of the industrial automation degree, the frequency converter is also widely applied.
The existing frequency converter is relatively unstable in connection at the connection point, the connection point is generally installed by directly clamping the connector, but in the repeated maintenance process, the clamping is gradually loose and unstable, the phenomenon such as line short circuit is relatively easy to occur in the situation, the frequency converter is used and is trapped, the temperature of the connection point is increased due to the fact that the connection of the connection point is subjected to the operation of the inside of the frequency converter, and the connection point is heated and scalded, so that the frequency converter is relatively more in faults. For this reason, an improvement to the above problems is desired.
Disclosure of Invention
The invention aims to solve the problems in the background art and provides a fault protection device for a frequency converter.
In order to achieve the above purpose, the invention provides a fault protection device for a frequency converter, which comprises a frequency converter main body, wherein a plurality of groups of wiring seats are arranged on the upper surface of the frequency converter main body, fixing pieces are arranged on the outer walls of two sides of the frequency converter main body and near the upper position, an outer casing is fixedly arranged above the outer side of the frequency converter main body, a connecting seat is fixedly arranged at the rear end of one side of the outer casing, and a wire clamping ventilation piece corresponding to the wiring seats is arranged outside the connecting seat.
Preferably, the fixing piece comprises mounting pieces which are fixedly mounted on the outer wall of one side of the frequency converter main body and close to the upper position, and bolts are connected with the inner sides of the mounting pieces in a threaded mode.
Preferably, the card line ventilation piece is including the cover shell of respectively fixed mounting in converter main part upper surface and mount pad both sides, the interior top of cover shell rotates and installs the movable shell, the inboard slidable mounting of cover shell has the guide arm, the guide arm outside is provided with elastic component, two sets of the rubber pad is installed jointly to the cover shell upper end, surface fixed mounting has the circle shell on the rubber pad, the round hole has been seted up to the rubber pad inboard, the circle shell outside is provided with the piece of admitting air, the equal fixed mounting in circle shell outside front end has temperature-sensing ware.
Preferably, the elastic component comprises springs which are sleeved on the outer sides of the guide rods, clamping blocks are fixedly arranged at the bottom ends of the guide rods, and clamping grooves which are matched with the clamping blocks are formed in the outer sides of the casing and the movable shell.
Preferably, the air inlet piece comprises triangular frames which are fixedly sleeved at the rear end of the outer side of the circular shell, the inner sides of the triangular frames are communicated with the inner sides of the circular shell through air inlet pipes which are clamped, and connecting pipes are arranged at the inner sides of one ends of the air inlet pipes in a communicating mode.
Preferably, the U-shaped pipes are installed on the outer sides of the connecting pipes in a common communication mode, and conveying pieces are arranged inside the two ends of each U-shaped pipe.
Preferably, the conveying part comprises air pumps which are all communicated with one end of a U-shaped pipe, the outer wall of one side of the air pump is arranged outside one end of the outer casing through a fixed seat which is fixedly arranged, and a cooler is sleeved outside the U-shaped pipe and is close to the outer part of the joint of the air pump.
Preferably, the U-shaped groove has been seted up to the outer shell inboard, U-shaped inslot slidable mounting has the slide bar, slide bar one side outer wall fixed mounting has the pull rod, slide bar one end outside and be close to outer shell inboard below position department fixed mounting has the doctor-bar, surface sliding mounting on doctor-bar and converter main part one side, the storage groove has all been seted up to the inside below position department that just is close to in outer shell both sides, two sets of the equal slidable mounting in storage inslot has the ash removal box, and two the equal fixed mounting in ash removal box one end outside has the handle.
Preferably, the wiring end of the frequency converter main body is electrically connected with a frequency converter detection module for collecting the running state of the frequency converter main body;
The information acquired by the frequency converter detection module is fed back to the frequency conversion power frequency operation control module to control the operation state of the frequency conversion power frequency operation control module;
the variable-frequency power frequency operation control module is electrically connected with the frequency converter main body to control the operation of the frequency converter main body or the overload damage switching to the power frequency operation;
The output end of the frequency converter main body U\V\W is coupled with the overheat protection module through an AC contactor KM main normally open connector;
The input end of the frequency converter detection module is electrically connected with the voltage reduction module, and the input end of the voltage reduction module is coupled with the voltage reduction module.
Preferably, the step-down module comprises a rectifier bridge U1, wherein the input end of the rectifier bridge U1 is electrically connected with one end of a capacitor C1, the other end of the capacitor C1 is electrically connected with one end of a normally-closed switch S1 of the heat sensor, the other end of the normally-closed switch S1 of the heat sensor is electrically connected with one end of a transformer T1, and the input end of the transformer T1 is coupled with 380V alternating current;
a thermistor FR1 is connected in series on the 380V alternating current circuit to collect the temperature of the 380V alternating current circuit;
The other output end of the transformer T1 is electrically connected with the other input end of the rectifier bridge U1;
The input end of the rectifier bridge U1 is electrically connected with the voltage reduction module;
The voltage reduction module comprises a polar capacitor C2, wherein the anode of the polar capacitor C2 is electrically connected with the output end of the rectifier bridge U1, the anode of the polar capacitor C2 is electrically connected with one end of a resistor R3 and one end of the resistor R2, and the other end of the resistor R2 is electrically connected with the other end of the resistor R3;
The other end of the resistor R3 is electrically connected with the other end of the resistor R4 and one end of the capacitor C6, the other end of the capacitor C6 is electrically connected with the other end of the resistor R4, and the other end of the resistor R4 is electrically connected with the cathode of the diode D1 and the anode of the diode D2;
The anode of the diode D1 is electrically connected with one end of the resistor R5 and the cathode of the polar capacitor C5, the anode of the polar capacitor C5 is electrically connected with the cathode of the diode D2, the cathode of the polar capacitor C2 and the other output end of the rectifier bridge U1, and the other end of the resistor R5 is electrically connected with the anode of the diode D3, the anode of the polar capacitor C4, one end of the capacitor C3 and one end of the resistor R6;
the anode of the polar capacitor C5 is electrically connected with the cathode of the diode D3, the cathode of the polar capacitor C4, the other end of the capacitor C3 and the other end of the resistor R6 and is grounded;
The other end of the resistor R5 is electrically connected with a frequency converter detection module, the frequency converter detection module comprises a relay KA1 coil, an IPF terminal of a frequency converter main body is electrically connected with one end of the relay KA1 coil, and the other end of the relay KA1 coil is electrically connected with a cathode of the diode D4, one end of the relay KA2 coil, a cathode of the diode D5, one end of the relay KA3 coil and a cathode of the diode D6;
One end of a coil of the relay KA1 is electrically connected with an anode of the diode D4, an OL terminal of the frequency converter main body (1) is electrically connected with one end of a normally closed point of the relay KA3, and the other end of the normally closed point of the relay KA3 is electrically connected with one end of the relay KA2 and the anode of the diode D5;
The FU wiring end of the frequency converter main body is electrically connected with one end of a normally closed point of the relay KA2, and the other end of the normally closed point of the relay KA2 is electrically connected with one end of the relay KA3 and the anode of the diode D6;
The R\S\T terminal of the frequency converter main body is electrically connected with an L1\L2\L3 power supply through a main normally open point of the alternating current contactor KM1, the L1\L2\L3 power supply is connected with a main normally open point of the alternating current contactor KM2 in parallel, and the other end of the main normally open point of the alternating current contactor KM2 is electrically connected with the input end of the overheat protection module;
The overheat protection module comprises a heat sensor FR2, wherein the input end of the heat sensor FR2 is electrically connected with the other end of the main normally open point of the alternating current contactor KM2 and the other end of the main normally open point of the alternating current contactor KM3, and the output end of the heat sensor FR2 is electrically connected with a motor M;
The A/C wiring end of the frequency converter main body is electrically connected with a frequency conversion power frequency operation control module (34), the frequency conversion power frequency operation control module comprises a relay KA0, one end of a coil of the relay KA0 is electrically connected with one end of a normally closed button SB3, and the other end of the normally closed button SB3 is electrically connected with one end of a normally open point of the relay KA0 and the A wiring end of the frequency converter main body;
The C terminal of the frequency converter main body is electrically connected with the other end of the normally open point of the relay KA0 and is electrically connected with one end of the normally closed button SB2, one end of the normally open point of the relay KA2 and one end of the normally open point of the relay KA 3;
The other end of the normally closed button SB2 is electrically connected with one end of the normally open button SB1 and one end of the auxiliary normally open point of the alternating current contactor KM1, the other end of the normally open button SB1 is electrically connected with one end of the normally open point of the relay KA1 and the other end of the auxiliary normally open point of the alternating current contactor KM1, and the other end of the normally open point of the relay KA1 is electrically connected with one end of the coil of the alternating current contactor KM 1;
The other end electric connection alternating current contactor KM3 of relay KA2 normally open point assists the one end of normally closed point, alternating current contactor KM3 assists the other end electric connection alternating current contactor KM2 coil one end of normally closed point, the other end electric connection alternating current contactor KM2 of normally closed point assists the one end of normally closed point, the other end electric connection alternating current contactor KM3 coil of normally closed point of alternating current contactor KM2, the other end electric connection alternating current contactor KM2 coil the other end of alternating current contactor KM1 coil and the other end of relay KA0 coil, the one end of relay KA0 coil the other end electric connection resistance R7, the one end of pilot lamp HL and the one end of honey ware HA, the one end of electric connection electric capacity C6 of electric capacity R7, the other end electric connection pilot lamp HL's the other end and the other end of honey ware HA of electric capacity C6.
Compared with the prior art, the invention has the following beneficial effects:
The round shell is arranged above the corresponding wire holder, the rubber pad on the inner side of the round shell can be used for inserting the assembled wire, then the wire at the wire connection position is clamped under the fixed arrangement of the round shell, the phenomenon that the wire connection position is not smooth and the connecting wire is loose to cause short circuit is avoided when the frequency converter main body is used, and when the wire is fixed, the air pumps on the two sides of the outer shell can be used for converting the air flow conveyed to the inner side of the round shell into cooling air flow under the assistance of the cooler, so that the heat quantity connected to the wire holder is reduced, the safety performance of the frequency converter main body is reduced at the source, the self protection capability of the frequency converter main body is improved, and the frequency converter main body is more stable when the connecting wire provides guarantee;
The low-voltage current input from the voltage reduction module is rectified through the rectifying module electrically connected with the frequency converter main body, and then is transmitted to the frequency converter detection module to supply power, wherein the voltage reduction module for voltage reduction adopts a heat sensor FR1 to collect the temperature of a 380V alternating current line and controls the power supply condition through a normally closed switch S1 of the heat sensor, once the short circuit and the high temperature occur, the frequency converter main body is immediately powered off, the frequency converter main body is stopped to protect the frequency converter main body, in addition, the frequency converter detection module is arranged to feed back the detection circuit inside the frequency converter main body to the frequency converter detection module after detecting that the detection circuit is normal before the frequency converter main body operates, the frequency conversion power frequency operation control module controls whether the frequency conversion power frequency operation control module operates, and the frequency conversion power frequency operation control module controls the frequency converter main body to operate and adopts a power frequency state or a frequency conversion state;
in addition, an overheat protection module is adopted to overheat-protect the main body and the main circuit of the frequency converter.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic view of another angle structure of the present invention;
FIG. 3 is a schematic view of the connection and installation between the outer housing and the conveying member of the present invention;
FIG. 4 is a schematic diagram illustrating the connection and installation between a round shell and a wire holder according to the present invention;
FIG. 5 is a schematic diagram showing the connection and installation between the outer shell and the slide bar;
FIG. 6 is a schematic view of another angle of attachment between the outer housing and the slide bar of the present invention;
FIG. 7 is a schematic view showing the structure of the fixture block, the guide rod and the casing of the present invention;
FIG. 8 is a circuit diagram of the control circuit of the present invention;
FIG. 9 is a diagram of a buck and voltage regulator circuit of the present invention;
FIG. 10 is a circuit diagram of a main body of the frequency converter, a frequency conversion power frequency operation control module of the invention;
FIG. 11 is a circuit diagram of a variable frequency power frequency operation control module of the present invention;
Fig. 12 is a circuit diagram of an external connection line of a main body of the frequency converter according to the present invention.
In the figure: 1. a frequency converter main body; 2. an outer shell; 3. a handle; 4. a fixing seat; 5. a U-shaped tube; 6. a tripod; 7. a connecting seat; 8. a mounting member; 9. a storage tank; 10. a round shell; 11. an air pump; 12. an air inlet pipe; 13. a wire holder; 14. a bolt; 15. a pull rod; 16. a slide bar; 17. a U-shaped groove; 18. a casing; 19. a spring; 20. a connecting pipe; 21. a temperature sensor; 22. a rubber pad; 23. an ash removal box; 24. a wiper blade; 25. a guide rod; 26. a movable case; 27. a clamping block; 28. a clamping groove; 29. a cooler 30 and a depressurization module; 31. a rectifying module; 32. a frequency converter detection module; 33. an overheat protection module; 34. and the variable-frequency power frequency operation control module.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than as described herein, and therefore the present invention is not limited to the specific embodiments disclosed below.
The fault protection device for the frequency converter comprises a frequency converter main body 1, a plurality of groups of wiring seats 13 are arranged on the upper surface of the frequency converter main body 1, fixing pieces are arranged on the outer walls of two sides of the frequency converter main body 1 and close to the upper position, an outer mounting shell 2 is fixedly arranged above the outer side of the frequency converter main body 1, a connecting seat 7 is fixedly arranged at the rear end of one side of the outer mounting shell 2, and wire clamping ventilation pieces corresponding to the wiring seats 13 are arranged outside the connecting seat 7.
The mounting part comprises mounting parts 8 which are fixedly mounted on the outer wall of one side of the frequency converter main body 1 and close to the upper position, and bolts 14 are connected with the inner side of the mounting parts 8 in a threaded manner.
As can be seen from fig. 1 and 2 of the description, the frequency converter body 1 can be mounted by means of the mounting elements 8 and bolts 14 provided.
The wire clamping ventilation piece comprises a casing 18 which is respectively and fixedly arranged on the upper surface of the frequency converter main body 1 and on two sides of the wire holder 13, a movable shell 26 is rotatably arranged above the inner side of the casing 18, a guide rod 25 is slidably arranged on the inner side of the casing 18, an elastic component is arranged on the outer side of the guide rod 25, rubber pads 22 are jointly arranged at the upper ends of the two sets of casings 18, round shells 10 are fixedly arranged on the upper surface of the rubber pads 22, round holes are formed in the inner sides of the rubber pads 22, an air inlet piece is arranged on the outer side of the round shells 10, and temperature sensors 21 are fixedly arranged at the front ends of the outer sides of the round shells 10.
As can be seen from fig. 4 of the specification, when the guide rod 25 is extruded, the round shell 10 and the rubber pad 22 are extruded to form an elastic component below, so that the wire clamping is more flexible, the temperature sensor 21 can be communicated with the air inlet piece, and when the temperature of the round shell 10 is too high, the air inlet piece is caused to automatically cool the inside of the round shell 10, so that the heat is reduced.
The elastic component includes the spring 19 that all suit is in the guide arm 25 outside, and guide arm 25 bottom fixed mounting has fixture block 27, and the draw-in groove 28 of adaptation fixture block 27 has all been seted up to the cover shell 18 and the movable shell 26 outside.
As shown in fig. 4 and 7 of the specification, the rubber pad 22 and the round shell 10 can reduce damage to the cable during pulling, flexibly swing the cable above, and facilitate the cable to be inserted, so that the whole structure can be pressed below, and then the connector of the cable is inserted into the inside of the wire holder 13;
Under the connection of the guide rod 25, the whole structure of the round shell 10 can be disassembled, when the clamping groove 28 of the movable shell 26 rotates to the state that the clamping groove 28 on the inner side of the shell 18 is vertical, the clamping block 27 is integrally inserted into the lower part on the inner side of the shell 18 in a sliding manner, when the position of the clamping block 27 is determined, the movable shell 26 can rotate above the clamping block 27, the clamping groove 28 is misplaced, the clamping block 27 is fixed, and otherwise, the guide rod 25 can be removed.
The air inlet piece is including all fixed the tripod 6 of cup jointing in circle shell 10 outside rear end, the inboard intake pipe 12 that passes through the cartridge of tripod 6 is linked together with circle shell 10 inboard, connecting pipe 20 is installed in inboard intercommunication of intake pipe 12 one end, U-shaped pipe 5 is installed in the common intercommunication in many connecting pipes 20 outsides, U-shaped pipe 5 both ends are inside all to be provided with the transport piece, the transport piece is including all the intercommunication and install the air pump 11 in U-shaped pipe 5 one end, the fixing base 4 through fixed setting is installed in outer shell 2 one end outsides on one side outer wall of air pump 11, the outside cover of junction that just is close to air pump 11 in U-shaped pipe 5 is equipped with cooler 29.
As can be seen from fig. 1, 2 and 3 of the specification, after the air pump 11 is started, the air flow can be conveyed to the inner sides of the connecting pipes 20 and the air inlet pipe 12 through the U-shaped pipe 5, so that the interior of the round shell 10 is blown, the conveyed air flow can be converted into low temperature with the aid of the cooler 29, and therefore, the heat of the inner side of the round shell 10 can be absorbed, and the purpose of cooling is achieved.
It should be noted that the cooler 29, the temperature sensor 21 and the air pump 11 are connected linearly, and the above is the prior art, and will not be repeated.
The U-shaped groove 17 has been seted up to outer shell 2 inboard, U-shaped groove 17 inboard slidable mounting has slide bar 16, slide bar 16 one side outer wall fixed mounting has pull rod 15, slide bar 16 one end outside and be close to outer shell 2 inboard below position department fixed mounting has doctor-bar 24, surface sliding mounting on doctor-bar 24 and converter main part 1 one side, storage groove 9 has all been seted up to outer shell 2 both sides inside and be close to below position department, two sets of storage groove 9 inboard all slidable mounting has ash removal box 23, and two ash removal box 23 one end outsides all fixed mounting have handle 3.
As shown in fig. 5 and 6 of the specification, the sliding rod 16 slides inside the U-shaped groove 17, so that the wiper blade 24 can be promoted to process the floating ash on the upper surface of one side of the frequency converter main body 1, so that the frequency converter main body 1 can be conveniently maintained in actual use, the floating ash can fall to the inside of the lower ash removal box 23 along with scraping of the wiper blade 24, then the floating ash is collected, and the ash removal box 23 can be pulled out to pour ash by pulling out the handle 3 later.
Working principle: when the novel frequency converter is used, a clamped cable is inserted into the circular hole on the inner side of the rubber pad 22, then the spliced connector of the cable is inserted into the inner side of the wire holder 13, the rubber pad 22 is wrapped on the surface of the cable, the surface of the cable is clamped, the problem that the cable cannot be spliced loose is guaranteed to the whole structure of the circular shell 10 at the wire holder 13, the air pumps 11 on the two sides of the outer shell 2 can convert the air flow conveyed to the inner side of the circular shell 10 into cooling air flow under the assistance of the cooler 29, so that the heat quantity connected to the wire holder 13 is reduced, the safety performance of the frequency converter main body 1 is reduced at the source, and the self-protection capability of the frequency converter main body 1 is improved, so that the frequency converter main body 1 is more stable when a connecting circuit provides guarantee.
In this embodiment, the terminal of the frequency converter main body 1 is electrically connected with the frequency converter detection module 32 that collects the running state of the frequency converter main body 1, and feeds back the information obtained by the frequency converter detection module 32 to the frequency conversion power frequency running control module 34 to control the running state of the frequency conversion power frequency running control module 34, the frequency conversion power frequency running control module 34 is electrically connected with the frequency converter main body 1 to control the running or overload damage switching of the frequency converter main body 1 to power frequency running, the output end of the frequency converter main body 1 u/v/w is coupled with the overheat protection module 33 through the main normally open connector of the ac contactor KM3, the input end of the frequency converter detection module 32 is electrically connected with the rectifying module 31, and the input end of the rectifying module 31 is coupled with the voltage reducing module 30.
According to the invention, the rectifier module 31 is electrically connected with the frequency converter main body 1 to rectify the low-voltage power input from the voltage reduction module 30, and the low-voltage power is transmitted to the frequency converter detection module 32 to supply power after the rectification, wherein the voltage reduction module 30 for voltage reduction adopts the heat sensor FR1 to collect the temperature of a 380V alternating current line and controls the power supply condition through the normally closed switch S1 of the heat sensor, once the short circuit condition occurs, the power supply is immediately interrupted, the frequency converter main body 1 stops operating to protect the frequency converter main body 1, the frequency converter detection module 32 is arranged to feed back to the frequency converter detection module 32 after detecting the normal state of a detection circuit in the frequency converter main body 1 before the frequency converter main body 1 operates, the frequency conversion power frequency operation control module 34 controls the frequency conversion power frequency operation control module 34 to operate and adopts the power frequency state or the frequency conversion state;
the main circuit of the inverter main body 1 is also overheat-protected by an overheat protection module 33.
In this embodiment, the step-down module 30 includes a rectifier bridge U1, an input end of the rectifier bridge U1 is electrically connected to one end of a capacitor C1, the other end of the capacitor C1 is electrically connected to one end of a normally closed switch S1 of the heat sensor, the other end of the normally closed switch S1 of the heat sensor is electrically connected to one end of a transformer T1, and an input end of the transformer T1 is coupled with 380V ac;
a thermistor FR1 is connected in series on the 380V alternating current circuit to collect the temperature of the 380V alternating current circuit;
The other output end of the transformer T1 is electrically connected with the other input end of the rectifier bridge U1;
The input end of the rectifier bridge U1 is electrically connected with the rectifier module 31;
380V voltage is input through the input end of the transformer T1, then 380V alternating current line temperature is acquired through the heat sensor FR1, the normally closed switch S1 of the heat sensor belongs to a closed state within a reasonable temperature range, and current is primarily rectified through the normally closed switch S1 of the heat sensor, the capacitor C1 and the resistor R1 and then further rectified through the rectifier bridge U1 and transmitted to the rectifier module 31.
The rectifying module 31 includes a polar capacitor C2, an anode of the polar capacitor C2 is electrically connected to the output end of the rectifying bridge U1, the anode of the polar capacitor C2 is electrically connected to one end of the resistor R3 and one end of the resistor R2, and the other end of the resistor R2 is electrically connected to the other end of the resistor R3;
The other end of the resistor R3 is electrically connected with the other end of the resistor R4 and one end of the capacitor C6, the other end of the capacitor C6 is electrically connected with the other end of the resistor R4, and the other end of the resistor R4 is electrically connected with the cathode of the diode D1 and the anode of the diode D2;
The anode of the diode D1 is electrically connected with one end of the resistor R5 and the cathode of the polar capacitor C5, the anode of the polar capacitor C5 is electrically connected with the cathode of the diode D2, the cathode of the polar capacitor C2 and the other output end of the rectifier bridge U1, and the other end of the resistor R5 is electrically connected with the anode of the diode D3, the anode of the polar capacitor C4, one end of the capacitor C3 and one end of the resistor R6;
the anode of the polar capacitor C5 is electrically connected with the cathode of the diode D3, the cathode of the polar capacitor C4, the other end of the capacitor C3 and the other end of the resistor R6 and is grounded;
The current is input to the polar capacitor C2 through the rectifier bridge U1 for rectification, and then the voltage is further reduced and rectified by the plurality of groups of capacitors and resistors, and finally the 24V voltage is output to the frequency converter detection module 32 for providing stable voltage and current.
The other end of the resistor R5 is electrically connected with the frequency converter detection module 32, the frequency converter detection module 32 comprises a relay KA1 coil, the IPF terminal of the frequency converter main body 1 is electrically connected with one end of the relay KA1 coil, and the other end of the relay KA1 coil is electrically connected with the cathode of the diode D4, one end of the relay KA2 coil, the cathode of the diode D5, one end of the relay KA3 coil and the cathode of the diode D6;
One end of a coil of the relay KA1 is electrically connected with an anode of the diode D4, an OL terminal of the frequency converter main body 1 is electrically connected with one end of a normally closed point of the relay KA3, and the other end of the normally closed point of the relay KA3 is electrically connected with one end of the relay KA2 and the anode of the diode D5;
The FU wiring terminal of the frequency converter main body 1 is electrically connected with one end of a normally closed point of the relay KA2, and the other end of the normally closed point of the relay KA2 is electrically connected with one end of the relay KA3 and the anode of the diode D6;
The R\S\T terminal of the frequency converter main body 1 is electrically connected with an L1\L2\L3 power supply through a main normally open point of the alternating current contactor KM1, the L1\L2\L3 power supply is connected with a main normally open point of the alternating current contactor KM2 in parallel, and the other end of the main normally open point of the alternating current contactor KM2 is electrically connected with the input end of the overheat protection module 33;
The overheat protection module 33 comprises a heat sensor FR2, wherein the input end of the heat sensor FR2 is electrically connected with the other end of the main normally open point of the ac contactor KM2 and the other end of the main normally open point of the ac contactor KM3, and the output end of the heat sensor FR2 is electrically connected with the motor M;
The A/C wiring end of the frequency converter main body 1 is electrically connected with the frequency conversion power frequency operation control module 34, the frequency conversion power frequency operation control module 34 comprises a relay KA0, one end of a coil of the relay KA0 is electrically connected with one end of a normally closed button SB3, and the other end of the normally closed button SB3 is electrically connected with one end of a normally open point of the relay KA0 and the A wiring end of the frequency converter main body 1;
the C terminal of the frequency converter main body 1 is electrically connected with the other end of the normally open point of the relay KA0 and is electrically connected with one end of the normally closed button SB2, one end of the normally open point of the relay KA2 and one end of the normally open point of the relay KA 3;
The other end of the normally closed button SB2 is electrically connected with one end of the normally open button SB1 and one end of the auxiliary normally open point of the alternating current contactor KM1, the other end of the normally open button SB1 is electrically connected with one end of the normally open point of the relay KA1 and the other end of the auxiliary normally open point of the alternating current contactor KM1, and the other end of the normally open point of the relay KA1 is electrically connected with one end of the coil of the alternating current contactor KM 1;
The other end electric connection alternating current contactor KM3 of relay KA2 normally open point assists the one end of normally closed point, alternating current contactor KM3 assists the other end electric connection alternating current contactor KM2 coil one end of normally closed point, the other end electric connection alternating current contactor KM2 of normally closed point assists the one end of normally closed point, the other end electric connection alternating current contactor KM3 coil of normally closed point of alternating current contactor KM2, the other end electric connection alternating current contactor KM2 coil the other end of alternating current contactor KM1 coil and the other end of relay KA0 coil, the one end of relay KA0 coil the other end electric connection resistance R7, the one end of pilot lamp HL and the one end of honey ware HA, the one end of electric connection electric capacity C6 of electric capacity R7, the other end electric connection pilot lamp HL's the other end and the other end of honey ware HA of electric capacity C6.
The method comprises the steps that after the frequency converter main body 1is started, an internal self-monitoring circuit feeds back whether the frequency converter main body 1is in a normal running state to a coil of the relay KA1 and performs light indication through a diode D4, meanwhile, the running state is fed back to an OL contact of the frequency converter main body 1, when the frequency converter main body 1 runs, the OL contact is not electrified, an FU contact of the frequency converter main body 1is electrified, then the coil of the relay KA3 is electrified, and then a normally open point of the relay KA3 is closed, so that the coil of the alternating current contactor KM3 is electrified, then a main normally open point of the alternating current contactor KM3 is controlled to be closed, after the running state is normal, a normally open point A in the frequency converter main body 1is closed, meanwhile, the normally open point of the relay KA 1is closed, a normally open point of the relay KA 1is synchronously closed, and meanwhile, because the coil of the relay KA 1is in a power supply, a complete current loop is formed through the normally open point of the normally closed button SB2, and then the main normally open point of the alternating current enters the frequency converter main body 1 through L1/L2/L3, and then the normally open point of the alternating current passes through the main point of the alternating current contactor 3 and then passes through the normally open point FR2 of the heat-sensitive motor M;
When the frequency operation needs to be switched to the power frequency operation, the OL point of the frequency converter main body 1 is connected, the FU point is disconnected, the problem of simultaneous operation is avoided in an interlocking mode of normally closed points of the relay KA3\KA2, in addition, the power supply of the coil of the relay KA1 is disconnected, the normally open point of the relay KA2 is closed, and thus the coil of the alternating current contactor KM2 is supplied with power, and the main normally open point of the alternating current contactor KM2 is closed, so that the function of the power frequency operation is realized.
Meanwhile, the invention also adds one end of the normally open button SA1 electrically connected with the STF joint of the frequency converter main body 1, and the other end of the normally open button SA1 is electrically connected with one end of the relay KA0 and one end of the normally open button SA 2;
The other end electric connection of normally open button SA 2's SD connects, the one end of normally open button SB4 and the one end of the normally closed point of thermosensitive ware FR2, and the other end electric connection of thermosensitive ware FR2 normally closed point is the OH end of transducer main part 1, and the other end electric connection of normally open button SB 4's RES end of transducer main part 1, relay KA0 normally closed point other end electric connection transducer main part 1's CS wiring end.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention, which is defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (5)

1. A fault protection device for a frequency converter, characterized in that: the frequency converter comprises a frequency converter main body (1), wherein a plurality of groups of wire holders (13) are arranged on the upper surface of the frequency converter main body (1), fixing pieces are arranged on the outer walls of two sides of the frequency converter main body (1) and close to the upper positions, an outer mounting shell (2) is fixedly arranged above the outer side of the frequency converter main body (1), a connecting seat (7) is fixedly arranged at the rear end of one side of the outer mounting shell (2), and wire clamping ventilation pieces corresponding to the wire holders (13) are arranged on the outer side of the connecting seat (7);
The wire clamping ventilation piece comprises a casing (18) which is respectively and fixedly arranged on the upper surface of a frequency converter main body (1) and on two sides of a wire holder (13), a movable shell (26) is rotatably arranged above the inner side of the casing (18), a guide rod (25) is slidably arranged in the casing (18), an elastic component is arranged on the outer side of the guide rod (25), rubber pads (22) are jointly arranged at the upper ends of the two groups of casings (18), a round shell (10) is fixedly arranged on the upper surface of the rubber pad (22), a round hole is formed in the inner side of the rubber pad (22), an air inlet piece is arranged on the outer side of the round shell (10), and a temperature sensor (21) is fixedly arranged at the front end of the outer side of the round shell (10);
The elastic component comprises a spring (19) sleeved on the outer side of the guide rod (25), a clamping block (27) is fixedly arranged at the bottom end of the guide rod (25), and clamping grooves (28) for adapting to the clamping block (27) are formed in the outer sides of the casing (18) and the movable shell (26);
the air inlet piece comprises a tripod (6) fixedly sleeved at the rear end of the outer side of the round shell (10), the inner side of the tripod (6) is communicated with the inner side of the round shell (10) through a clamped air inlet pipe (12), and a connecting pipe (20) is arranged at the inner side of one end of the air inlet pipe (12) in a communicating manner;
The outer sides of the plurality of connecting pipes (20) are jointly communicated and provided with U-shaped pipes (5), and conveying parts are arranged inside two ends of each U-shaped pipe (5);
the conveying part comprises air pumps (11) which are all communicated with one end of a U-shaped pipe (5), the outer wall of one side of each air pump (11) is arranged outside one end of the outer casing (2) through a fixed seat (4) which is fixedly arranged, and a cooler (29) is sleeved outside the U-shaped pipe (5) and is close to the outer part of the joint of each air pump (11).
2. The fault protection device for a frequency converter according to claim 1, wherein: the fixing piece comprises mounting pieces (8) which are fixedly mounted on the outer wall of one side of the frequency converter main body (1) and are close to the upper position, and bolts (14) are connected with the inner sides of the mounting pieces (8) in a threaded mode.
3. The fault protection device for a frequency converter according to claim 1, wherein: u-shaped groove (17) have been seted up to outer dress shell (2) inboard, U-shaped groove (17) inside sliding mounting has slide bar (16), slide bar (16) one side outer wall fixed mounting has pull rod (15), slide bar (16) one end outside and be close to outer dress shell (2) inboard below position department fixed mounting have doctor-bar (24), surface sliding mounting on doctor-bar (24) and converter main part (1) one side, storage groove (9) have all been seted up to the inside below position department that is close to in outer dress shell (2) both sides, two sets of storage groove (9) inboard all slidable mounting has ash removal box (23), and two all fixed mounting has handle (3) in ash removal box (23) one end outside.
4. The fault protection device for a frequency converter according to claim 1, wherein: the wiring end of the frequency converter main body (1) is electrically connected with a frequency converter detection module (32) for collecting the running state of the frequency converter main body (1);
The information acquired by the frequency converter detection module (32) is fed back to the frequency conversion power frequency operation control module (34) to control the operation state of the frequency conversion power frequency operation control module (34);
the variable-frequency power frequency operation control module (34) is electrically connected with the frequency converter main body (1) to control the variable-frequency operation or overload damage switching of the frequency converter main body (1) to the power frequency operation;
The output end of the frequency converter main body (1) U\V\W is coupled with an overheat protection module (33) through a main normally open connector of an alternating current contactor KM 3;
The input end of the frequency converter detection module (32) is electrically connected with the rectification module (31), and the input end of the rectification module (31) is coupled with the voltage reduction module (30).
5. The fault protection device for a frequency converter according to claim 4, wherein: the step-down module (30) comprises a rectifier bridge U1, wherein the input end of the rectifier bridge U1 is electrically connected with one end of a capacitor C1, the other end of the capacitor C1 is electrically connected with one end of a normally-closed switch S1 of the heat sensor, the other end of the normally-closed switch S1 of the heat sensor is electrically connected with one end of a transformer T1, and the input end of the transformer T1 is coupled with 380V alternating current;
a thermistor FR1 is connected in series on the 380V alternating current circuit to collect the temperature of the 380V alternating current circuit;
The other output end of the transformer T1 is electrically connected with the other input end of the rectifier bridge U1;
the output end of the rectifier bridge U1 is electrically connected with the rectifier module (31);
The rectifying module (31) comprises a polar capacitor C2, wherein the anode of the polar capacitor C2 is electrically connected with the output end of the rectifying bridge U1, the anode of the polar capacitor C2 is electrically connected with one end of a resistor R3 and one end of the resistor R2, and the other end of the resistor R2 is electrically connected with the other end of the resistor R3;
the other end of the resistor R3 is electrically connected with one end of the resistor R4 and one end of the capacitor C6, the other end of the capacitor C6 is electrically connected with the other end of the resistor R4, and the other end of the resistor R4 is electrically connected with the cathode of the diode D1 and the anode of the diode D2;
The anode of the diode D1 is electrically connected with one end of the resistor R5 and the cathode of the polar capacitor C5, the anode of the polar capacitor C5 is electrically connected with the cathode of the diode D2, the cathode of the polar capacitor C2 and the other output end of the rectifier bridge U1, and the other end of the resistor R5 is electrically connected with the anode of the diode D3, the anode of the polar capacitor C4, one end of the capacitor C3 and one end of the resistor R6;
the anode of the polar capacitor C5 is electrically connected with the cathode of the diode D3, the cathode of the polar capacitor C4, the other end of the capacitor C3 and the other end of the resistor R6 and is grounded;
The other end of the resistor R5 is electrically connected with the frequency converter detection module (32), the frequency converter detection module (32) comprises a relay KA1 coil, an IPF terminal of the frequency converter main body (1) is electrically connected with one end of the relay KA1 coil, and the other end of the relay KA1 coil is electrically connected with a cathode of the diode D4, one end of the relay KA2 coil, a cathode of the diode D5, one end of the relay KA3 coil and a cathode of the diode D6;
One end of a coil of the relay KA1 is electrically connected with an anode of the diode D4, an OL terminal of the frequency converter main body (1) is electrically connected with one end of a normally closed point of the relay KA3, and the other end of the normally closed point of the relay KA3 is electrically connected with one end of the relay KA2 and the anode of the diode D5;
the FU wiring terminal of the frequency converter main body (1) is electrically connected with one end of a normally closed point of the relay KA2, and the other end of the normally closed point of the relay KA2 is electrically connected with one end of the relay KA3 and the anode of the diode D6;
The R\S\T terminal of the frequency converter main body (1) is electrically connected with an L1\L2\L3 power supply through a main normally open point of the alternating current contactor KM1, the L1\L2\L3 power supply is connected with a main normally open point of the alternating current contactor KM2 in parallel, and the other end of the main normally open point of the alternating current contactor KM2 is electrically connected with the input end of the overheat protection module (33);
the overheat protection module (33) comprises a heat sensor FR2, wherein the input end of the heat sensor FR2 is electrically connected with the other end of the main normally open point of the alternating current contactor KM2 and the other end of the main normally open point of the alternating current contactor KM3, and the output end of the heat sensor FR2 is electrically connected with a motor M;
the A/C wiring end of the frequency converter main body (1) is electrically connected with the frequency conversion power frequency operation control module (34), the frequency conversion power frequency operation control module (34) comprises a relay KA0, one end of a coil of the relay KA0 is electrically connected with one end of a normally closed button SB3, and the other end of the normally closed button SB3 is electrically connected with one end of a normally open point of the relay KA0 and the A wiring end of the frequency converter main body (1);
The C terminal of the frequency converter main body (1) is electrically connected with the other end of the normally open point of the relay KA0 and is electrically connected with one end of the normally closed button SB2, one end of the normally open point of the relay KA2 and one end of the normally open point of the relay KA 3;
The other end of the normally closed button SB2 is electrically connected with one end of the normally open button SB1 and one end of the auxiliary normally open point of the alternating current contactor KM1, the other end of the normally open button SB1 is electrically connected with one end of the normally open point of the relay KA1 and the other end of the auxiliary normally open point of the alternating current contactor KM1, and the other end of the normally open point of the relay KA1 is electrically connected with one end of the coil of the alternating current contactor KM 1;
The other end electric connection alternating current contactor KM3 of relay KA2 normally open point assists the one end of normally closed point, alternating current contactor KM3 assists the other end electric connection alternating current contactor KM2 coil one end of normally closed point, the other end electric connection alternating current contactor KM2 of normally closed point assists the one end of normally closed point, the other end electric connection alternating current contactor KM3 coil of normally closed point of alternating current contactor KM2, the other end electric connection alternating current contactor KM2 coil the other end of alternating current contactor KM1 coil and the other end of relay KA0 coil, the one end of relay KA0 coil the other end electric connection resistance R7, the one end of pilot lamp HL and the one end of honey ware HA, the one end of electric connection electric capacity C6 of electric capacity R7, the other end electric connection pilot lamp HL's the other end and the other end of honey ware HA of electric capacity C6.
CN202410122252.5A 2024-01-30 2024-01-30 Fault protection device for frequency converter Active CN117650396B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009110888A (en) * 2007-10-31 2009-05-21 Sumitomo Electric Ind Ltd Ultrasonic probe cable and its manufacturing method
CN206805318U (en) * 2017-05-03 2017-12-26 盘锦辽河油田博洋工控技术有限公司 Temperature control system in frequency conversion tank
CN217694169U (en) * 2022-07-06 2022-10-28 金鑫宇电源（深圳）有限责任公司 External protection cover shell of charger
CN117116630A (en) * 2023-10-25 2023-11-24 新乡市胜源电气有限公司 Binding post fixing device and binding post fixing method for low-voltage series reactor
CN117219420A (en) * 2023-10-11 2023-12-12 河北任硕电力金具有限公司 Wiring device for transformer
CN220272810U (en) * 2023-07-18 2023-12-29 周婧 External power connector protection device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009110888A (en) * 2007-10-31 2009-05-21 Sumitomo Electric Ind Ltd Ultrasonic probe cable and its manufacturing method
CN206805318U (en) * 2017-05-03 2017-12-26 盘锦辽河油田博洋工控技术有限公司 Temperature control system in frequency conversion tank
CN217694169U (en) * 2022-07-06 2022-10-28 金鑫宇电源（深圳）有限责任公司 External protection cover shell of charger
CN220272810U (en) * 2023-07-18 2023-12-29 周婧 External power connector protection device
CN117219420A (en) * 2023-10-11 2023-12-12 河北任硕电力金具有限公司 Wiring device for transformer
CN117116630A (en) * 2023-10-25 2023-11-24 新乡市胜源电气有限公司 Binding post fixing device and binding post fixing method for low-voltage series reactor

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