CN202103583U - Mining explosion-proof and intrinsically safe AC frequency converter - Google Patents
Mining explosion-proof and intrinsically safe AC frequency converter Download PDFInfo
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- CN202103583U CN202103583U CN2011202175341U CN201120217534U CN202103583U CN 202103583 U CN202103583 U CN 202103583U CN 2011202175341 U CN2011202175341 U CN 2011202175341U CN 201120217534 U CN201120217534 U CN 201120217534U CN 202103583 U CN202103583 U CN 202103583U
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Abstract
The present utility model relates to a mining explosion-proof and intrinsically safe AC frequency converter. The AC frequency converter comprises a main wiring chamber and a main chamber, the two sides of the front end face of the main chamber are connected with a left welding door and a right welding door through a left door-opening mechanism and a right door-opening mechanism, and a control circuit, a control transformer, a commutation operating mechanism, an isolation switch connected with a three-phase AC power supply, an AC vacuum contactor for connecting with a frequency converter load, and a bypass AC vacuum contactor for directly connecting with the three-phase AC power supply and the load are arranged inside the main chamber. The frequency converter is suitable for coal mines with explosive gases and coal dusts, and is reasonable in structure, safe and reliable in work, strong in breaking capacity, maintenance-free, and long in service life. The frequency converter can be used to control the frequency modulation soft start, the speed regulation, the commutation, the motor power output adjusting, the inertia parking and the soft parking of an AC induction motor, and protect lines and the motor comprehensively. Control requirements of different load objects, such as air blowers, water pumps, adhesive tape machines, winches and overhead man cars of different load characteristics can be satisfied.
Description
Technical field
The utility model relates to the technical field of AC converter, specifically is a kind of mine flameproof and intrinsic safety type AC converter.
Background technology
Tradition ac-dc-ac inverter device employing diode rectifier bridge is adjusted AC power and is direct current, and this frequency converter can only be operated in motoring condition, so be referred to as two quadrant frequency converters.Because two quadrant frequency converters adopt diode rectifier bridge, can't realize the two-way flow of energy, so can not send the energy of motor feedback system back to electrical network.Want in the application of feedback energy at some motors,, can only on two quadrant frequency converters, increase the resistance braking unit, the energy consumption of motor feedback is fallen, cause waste of electric energy such as monkey car, hoister system.In addition, in some powerful application, diode rectifier bridge produces serious harmonic pollution to electrical network.
Frequency converter is used for transformation of electrical energy, can be adjusted to load to the AC power of fixed frequency, voltage frequency conversion, variable-voltage power supply are provided.Change asynchronous machine stator frequency f and can regulate the motor synchronous rotating speed smoothly, and then regulate the motor rated speed smoothly; If f diminishes, supply voltage U remains unchanged, and then the motor gas-gap magnetic flux will increase, and this can make the motor magnetic circuit saturated, and exciting curent rises (current of electric rising), produces big electric current, and this is unallowed; If it is big that f becomes, U remains unchanged, and then the motor gas-gap magnetic flux will reduce, and this certainly will cause the output torque of motor to descend, and can make motor rotation blockage when serious, and this also is unallowed.Therefore require in frequency modulation, to change the stator power voltage U, constant to keep magnetic flux.
The utility model content
The technical problem that the utility model will solve provide a kind of simple in structure, be suitable for improving the stability of frequency converter under coal mine and the mine flameproof and intrinsic safety type AC converter of energy-saving efficiency.
In order to solve the problems of the technologies described above, the utility model provides a kind of mine flameproof and intrinsic safety type AC converter, comprising: the main electrical scheme chamber and the main chamber that are provided with up and down, and the right ends in main electrical scheme chamber respectively is provided with cable entry; The positive end face both sides in main chamber link to each other with left and right welding door through left and right door-opening mechanism; Control circuit, control transformer, switch operation mechanism, the isolating switch that links to each other with three-phase alternating-current supply, the AC vacuum contactor that is used to be connected inverter load are arranged in the main chamber, be used for directly connecting the bypass AC vacuum contactor of three-phase alternating-current supply and load.
Said control circuit comprises: the rectification circuit that links to each other with isolating switch; The storage capacitor that links to each other with the dc output end of this rectification circuit; The pre-charge circuit parallelly connected with said rectification circuit; The IGBT drive circuit that links to each other with storage capacitor; The CPU element that links to each other with the control input end of IGBT drive circuit; The touch-screen that links to each other with CPU element; The frequency converter output current that links to each other with CPU element detects the loop; Being used to of linking to each other with CPU element detected the direct voltage testing circuit of the voltage of storage capacitor; Be used to control the PLC of said AC vacuum contactor and bypass AC vacuum contactor.
Further, said left side welding door is provided with observation window, and the touch-screen that is used to observe transducer operational parameter and record is located in the observation window; Left side welding door is gone up in the observation window below and is provided with: be used for the button that is provided with of parameter and function setting, be used for the control button that the control of conversion device starts, stops, resetting, be used to select to move two change over switches of working method.
Further, the opposed edges of said left and right welding door is provided with and is used for spacing each other guide vane end stop.Said main electrical scheme top of chamber is provided with protective baffle plate.
The technique scheme of the utility model is compared prior art and had the following advantages: the mine flameproof and intrinsic safety type AC converter of the utility model adopts vector control technology; Reduce supply voltage and frequency during electric motor starting in proportion simultaneously; Frequency during electric motor starting is low more; Motor speed is just low more, and mechanical shock is more little.Frequency is low to moderate 1-2Hz, can thoroughly eliminate mechanical shock.Because supply voltage and frequency reduce simultaneously, motor gas-gap main flux ф keeps constant when quickening; Directly the moment control technology also can make the real component of motor stator, rotor current when quickening, keep constant simultaneously; Motor electromagnetic moment M can export high torque (HT) (that is: electromagnetic torque M did not only descend when motor electromagnetic moment M compared its normal operation during startup, increased to some extent on the contrary) when quickening.The real component that vector control technology can make motor stator, rotor current when quickening, keep constant in; Reduce its idle component value; So just greatly reduce the starting current of motor; Make the starting current of motor be no more than 1.5 times of motor rated current usually, the electrical impact phenomenon when thoroughly having eliminated electric motor starting is very favourable to electric equipment.(2) four-quadrant frequency converter of the utility model can well overcome the shortcoming of prior art, has fully improved stability and the energy-saving efficiency of frequency converter under coal mine.This product is applicable to the colliery of containing damp (methane) and coal dust, has rational in infrastructure, safe and reliable, characteristics such as breaking capacity is strong, non-maintaining, long service life.Exchanging 0 to 50Hz; In the voltage 660V electric power system; Power 250KW and following AC induction motor are carried out controls such as frequency modulation soft start, speed governing, switching-over, the output of adjusting power of motor, inertia parking, soft stop; And circuit and motor carried out integrated protection, also can carry out the chain control of equipment of many same models.Can satisfy the control requirement of different loads characteristics such as blower fan, water pump, sealing-tape machine, winch, impractical person vehicle, different loads object.
Description of drawings
For the content that makes the utility model is more clearly understood, below basis specific embodiment and combine accompanying drawing, the utility model is done further detailed explanation, wherein
Fig. 1 is the Facad structure figure of the mine flameproof and intrinsic safety type AC converter among the embodiment;
Fig. 2 is the AC converter side structure sketch map among Fig. 1;
Fig. 3 is the vertical view of the AC converter among Fig. 1;
Fig. 4 is the circuit block diagram of above-mentioned AC converter.
Embodiment
See Fig. 1-4, the mine flameproof and intrinsic safety type AC converter of present embodiment comprises: the main electrical scheme chamber 1 and the main chamber 2 that are provided with up and down, and the right ends in main electrical scheme chamber 1 respectively is provided with cable entry 1-1; The positive end face both sides in main chamber 2 link to each other with left and right welding door 7,8 through left and right door-opening mechanism 4,6; Control circuit, control transformer, switch operation mechanism 5, the isolating switch that links to each other with three-phase alternating-current supply, the AC vacuum contactor that is used to be connected inverter load (being motor) are arranged in the main chamber 1, be used for directly connecting the bypass AC vacuum contactor of three-phase alternating-current supply and load.
Said control circuit comprises: the rectification circuit that links to each other with isolating switch; The storage capacitor that links to each other with the dc output end of this rectification circuit; The pre-charge circuit parallelly connected with said rectification circuit; The IGBT drive circuit that links to each other with storage capacitor; The CPU element that links to each other with the control input end of IGBT drive circuit; The touch-screen that links to each other with CPU element; The frequency converter output current that links to each other with CPU element detects the loop; Being used to of linking to each other with CPU element detected the direct voltage testing circuit of the voltage of storage capacitor; Be used to control the PLC of said AC vacuum contactor and bypass AC vacuum contactor.PLC is connected with peripheral interface circuit.
Said left side welding door 8 is provided with observation window, and the touch-screen that is used to observe transducer operational parameter and record is located in the observation window; Be provided with in the observation window below on the left side welding door 8: what be used for parameter and function setting is provided with button 19, is used for the control button 20 that the control of conversion device starts, stops, resetting, and is used to select to move two change over switches 22 of working method.
The opposed edges of said left and right welding door 7,8 is provided with and is used for spacing each other guide vane end stop 10.
1 top, said main electrical scheme chamber is provided with protective baffle plate 12.
Three-phase alternating current gets into rectification circuit through isolating switch, the adhesive of the AC vacuum contactor of PLC control simultaneously.The precharging circuit of frequency converter charges to storage capacitor, and CPU element detects the voltage at storage capacitor two ends simultaneously, and when reaching preset value, control rectification circuit bypass pre-charge circuit is to cut off pre-charge circuit.CPU element is controlled IGBT according to the program of CPU inner setting and the parameter of keyboard to set up, exports to the interchange three phase electric machine.The frequency converter output current detects the loop and load is carried out is in real time detected, CPU element according to detect feedback signal in real time IGBT is controlled.When frequency converter generation catastrophe failure,, can temporarily frequency converter be gone to the work of power frequency pattern for not influencing production.Under this pattern, directly export power-frequency voltage to three phase electric machine, so that emergent the use through PLC.
Through observation window, can observe each operational factor of frequency converter, check various records.Two row's buttons are arranged, seven buttons of first row under the observation window: be respectively that fast rise, downward modulation, a left side are transferred, rightly transfer, confirm, withdrawed from, menu, carry out parameter setting and function setting with them.Second row has three buttons: start, stop, resetting, two change over switches are arranged below, be used for selecting the operation working method.
The binding post that 9 GF16 are arranged in the main electrical scheme chamber is respectively 3 major loop inlet wire binding posts, 3 major loop outlet binding posts, 3 660V electric power incoming line binding posts; 9 GF6 binding posts are respectively 3 and use binding post, 3 lock motor power binding posts and 3 explosion-proof fan power supply terminals synchronously.5 nine core control binding posts.2 main loop cabling introducing devices are each side arranged at top, and maximum lead-in cable external diameter is φ 78mm; 10 control cable introducing devices are arranged simultaneously, and maximum lead-in cable external diameter is φ 12.9mm.
There is an observation window in front, main chamber, can observe each operational factor of frequency converter, check various records.Two row's buttons are arranged, seven buttons of first row under the observation window: be respectively that fast rise, downward modulation, a left side are transferred, rightly transfer, confirm, withdrawed from, menu, carry out parameter setting and function setting with them.Second row has three buttons: start, stop, resetting, two change over switches are arranged below, be used for selecting the operation working method.Parts such as frequency converter assembly, control circuit, control transformer, intrinsically safe circuit plate, isolating switch, vacuum contactor are arranged in the main chamber.
Have 6 GF16 binding posts in the main electrical scheme chamber, be respectively 3 660V electric power incoming line binding posts, 3 outlet binding posts; 3 GF6 binding posts be used for frequency converter synchronously; 3 nine core control binding posts.2 main loop cabling introducing devices are each side arranged at top, and maximum lead-in cable external diameter is φ 78mm; 5 control cable introducing devices are arranged in addition, and maximum cable is introduced diameter phi 12.9mm.Parts such as reactor, PIU unit, cooling fan, transformer are arranged in the main chamber.
In the present embodiment, adopt the IGBT module as rectifier bridge, the IGBT module can realize the two-way flow of energy; Adopt IGBT to do rectifier bridge; Can adjust the power factor of input on the one hand, eliminate harmonic pollution, let frequency converter really become " green product " electrical network.Can the anti-electrical network of delivering to of energy of electromotor feedback generation be reached energy-saving effect completely on the other hand.This product adopts vector control technology, can carry out stepless speed control to alternating current machine, and the speed adjusting performance of alternating current machine can be compared favourably with the DC motor speed-regulating performance; Have the advantages that starting torque is big, starting speed is low, can motor operation carrying out complete monitoring be regulated power of motor output, change direction of motor rotation, speed simultaneously.Adopt new and high technologies such as advanced DSP microprocessor and power electronic technology and digital no velocity control, low pressure inductance busbar, the automatic commutation of AFE, electronic filtering, power model heat pipe heat radiation, thoroughly machinery and the electrical impact in the abatement apparatus start-up course.The heat pipe heat radiation technology is adopted in the heat radiation of power component, has solved a heat dissipation technology difficult problem of moving when high-power flame proof frequency converter is grown.It also has defencive functions such as overvoltage, under-voltage, overcurrent, overload, overheated, phase shortage in addition, and various faults all can show and supply through LCD check that at any time the automatic record trouble of computer makes things convenient for fault inquiry and processing.
Obviously, the foregoing description only be for explain clearly that the utility model does for example, and be not to be qualification to the execution mode of the utility model.For the those of ordinary skill in affiliated field, on the basis of above-mentioned explanation, can also make other multi-form variation or change.Here need not also can't give exhaustive to all execution modes.And conspicuous variation that these spirit that belong to the utility model are extended out or change still are among the protection range of the utility model.
Claims (4)
1. mine flameproof and intrinsic safety type AC converter is characterized in that comprising: the main electrical scheme chamber (1) and main chamber (2) that are provided with up and down, and the right ends of main electrical scheme chamber (1) respectively is provided with cable entry (1-1);
The positive end face both sides in main chamber (2) link to each other with left and right welding door (7,8) through left and right door-opening mechanism (4,6);
Control circuit, control transformer, switch operation mechanism (5), the isolating switch that links to each other with three-phase alternating-current supply, the AC vacuum contactor that is used to be connected inverter load are arranged in the main chamber (1), be used for directly connecting the bypass AC vacuum contactor of three-phase alternating-current supply and load;
Said control circuit comprises: the rectification circuit that links to each other with isolating switch; The storage capacitor that links to each other with the dc output end of this rectification circuit; The pre-charge circuit parallelly connected with said rectification circuit; The IGBT drive circuit that links to each other with storage capacitor; The CPU element that links to each other with the control input end of IGBT drive circuit; The touch-screen that links to each other with CPU element; The frequency converter output current that links to each other with CPU element detects the loop; Being used to of linking to each other with CPU element detected the direct voltage testing circuit of the voltage of storage capacitor; Be used to control the PLC of said AC vacuum contactor and bypass AC vacuum contactor.
2. mine flameproof and intrinsic safety type AC converter according to claim 1 is characterized in that: said left side welding door (8) is provided with observation window, and the touch-screen that is used to observe transducer operational parameter and record is located in the observation window; Left side welding door (8) is gone up in the observation window below and is provided with: what be used for parameter and function setting is provided with button (19), is used for the control button (20) that the control of conversion device starts, stops, resetting, and is used to select to move two change over switches (22) of working method.
3. mine flameproof and intrinsic safety type AC converter according to claim 1 is characterized in that: the opposed edges of said left and right welding door (7,8) is provided with and is used for spacing each other guide vane end stop (10).
4. mine flameproof and intrinsic safety type AC converter according to claim 1 is characterized in that: top, said main electrical scheme chamber (1) is provided with protective baffle plate (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202175341U CN202103583U (en) | 2011-06-24 | 2011-06-24 | Mining explosion-proof and intrinsically safe AC frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202175341U CN202103583U (en) | 2011-06-24 | 2011-06-24 | Mining explosion-proof and intrinsically safe AC frequency converter |
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| Publication Number | Publication Date |
|---|---|
| CN202103583U true CN202103583U (en) | 2012-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202175341U Expired - Fee Related CN202103583U (en) | 2011-06-24 | 2011-06-24 | Mining explosion-proof and intrinsically safe AC frequency converter |
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| Country | Link |
|---|---|
| CN (1) | CN202103583U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684289A (en) * | 2012-05-11 | 2012-09-19 | 中煤电气有限公司 | Large-capacity explosion-proof type uninterrupted power system |
| CN103414319A (en) * | 2013-08-30 | 2013-11-27 | 电光防爆科技（上海）有限公司 | Mining explosive-proof and intrinsically-safe alternating-current converter |
| CN106602961A (en) * | 2016-12-23 | 2017-04-26 | 川铁电气（天津）股份有限公司 | Disconnecting switch operating mechanism driver based on single chip microcomputer |
| CN109709853A (en) * | 2018-12-28 | 2019-05-03 | 川铁电气（天津）股份有限公司 | A kind of cassette drive array unit based on network switching control station |
-
2011
- 2011-06-24 CN CN2011202175341U patent/CN202103583U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684289A (en) * | 2012-05-11 | 2012-09-19 | 中煤电气有限公司 | Large-capacity explosion-proof type uninterrupted power system |
| CN103414319A (en) * | 2013-08-30 | 2013-11-27 | 电光防爆科技（上海）有限公司 | Mining explosive-proof and intrinsically-safe alternating-current converter |
| CN106602961A (en) * | 2016-12-23 | 2017-04-26 | 川铁电气（天津）股份有限公司 | Disconnecting switch operating mechanism driver based on single chip microcomputer |
| CN109709853A (en) * | 2018-12-28 | 2019-05-03 | 川铁电气（天津）股份有限公司 | A kind of cassette drive array unit based on network switching control station |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120104 Termination date: 20170624 |