CN210807085U - Mining explosion-proof type high-voltage frequency converter - Google Patents

Mining explosion-proof type high-voltage frequency converter Download PDF

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Publication number
CN210807085U
CN210807085U CN201921741314.1U CN201921741314U CN210807085U CN 210807085 U CN210807085 U CN 210807085U CN 201921741314 U CN201921741314 U CN 201921741314U CN 210807085 U CN210807085 U CN 210807085U
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China
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water
cooling
frequency converter
transformer
phase
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CN201921741314.1U
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Chinese (zh)
Inventor
徐占军
李瑞常
罗自永
白俊
董以恒
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SHENZHEN CUMARK NEW TECHNOLOGY CO LTD
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SHENZHEN CUMARK NEW TECHNOLOGY CO LTD
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Abstract

The utility model discloses a mining flame-proof type high-voltage inverter, including explosion-proof casing, shift the phase transformer, the transform circuit, the control unit and cooling system, the transform circuit includes the power unit of multiunit series connection, the AC input end of power unit connects the three-phase output end of the low pressure side of shift the phase transformer through the cable, explosion-proof casing vertically includes transformer chamber, power unit chamber and control and cooling chamber in proper order, shift the phase transformer, transform circuit and control unit and arrange respectively in corresponding transformer chamber, power unit chamber and control chamber; the partition plate between the transformer cavity and the power unit cavity comprises a cable through hole, and the cable penetrates through the cable through hole to connect the phase-shifting transformer and the power unit; the control unit and parts of the cooling system are arranged in the control and cooling chamber. The utility model discloses a mining flame-proof type high-voltage inverter is small, and power density is high.

Description

Mining explosion-proof type high-voltage frequency converter
[ technical field ]
The utility model relates to a high-voltage inverter especially relates to a mining flame-proof type high-voltage inverter.
[ background art ]
Along with the technical progress, the capacity of a modern mine is continuously expanded, the voltage of an underground main conveying belt adaptive motor is increased to 10kV, the power of the motor is continuously increased, the original mode of directly starting the motor cannot meet the production requirement, and the mine explosion-proof and intrinsically safe high-voltage frequency converter with 10kV input/0-10 kV output is adopted for driving, so that a good solution is provided. The traditional mining explosion-proof and intrinsically safe high-voltage frequency converter with 10kV input/0-10 kV output generally has low integration level and poor reliability.
The invention with the application number of CN201110271028.5 discloses a mining explosion-proof high-voltage frequency converter, which comprises a phase-shifting transformer unit explosion-proof box and a power unit explosion-proof box, wherein a phase-shifting isolation transformer and a heat dissipation system are arranged in the phase-shifting transformer unit explosion-proof box, and a plurality of groups of power units, a control unit and a heat dissipation system which are connected in series are arranged in the power unit explosion-proof box. The high-voltage side of the phase-shifting isolation transformer is connected in series in a three-phase high-voltage power grid, a plurality of groups of power units which are connected in series are respectively connected with the low-voltage side of the phase-shifting isolation transformer, and the power units are connected with the control unit through optical fibers.
The phase-shifting transformer and the frequency converter are both independent explosion-proof units, and are connected through a plurality of mining explosion-proof cables. The mine explosion-proof cable is long, large in size, low in power density and poor in reliability.
[ summary of the invention ]
The to-be-solved technical problem of the utility model is to provide a mining flame-proof type high-voltage inverter that is small, and power density is high.
In order to solve the technical problem, the utility model discloses a technical scheme is, a mining flame-proof type high-voltage inverter, including explosion-proof casing, the phase-shifting transformer, the converting circuit, control unit and cooling system, the converting circuit includes the power unit that the multiunit is established ties, the ac input end of power unit connects the three-phase output end of the low pressure side of phase-shifting transformer through the cable, explosion-proof casing vertically includes transformer chamber, power unit chamber and control and cooling chamber in proper order, phase-shifting transformer, converting circuit and control unit with arrange respectively in corresponding transformer chamber, power unit chamber and control chamber; the partition plate between the transformer cavity and the power unit cavity comprises a cable through hole, and the cable penetrates through the cable through hole to connect the phase-shifting transformer and the power unit; the control unit and parts of the cooling system are arranged in the control and cooling chamber.
The cooling system of the mining explosion-proof high-voltage frequency converter comprises an inner water circulation system, an outer water circulation system and a transformer cooling device, wherein the transformer cooling device is installed in a transformer cavity, and a water path of the transformer cooling device is connected in series with a water path of the outer water circulation system.
The transformer cooling device of the mining explosion-proof high-voltage frequency converter comprises the fan and the hot air water-cooling radiator, the phase-shifting transformer, the fan and the hot air water-cooling radiator are arranged in the air duct in the transformer cavity, and the water duct of the hot air water-cooling radiator is connected in series in the water path of the external water circulation system.
According to the mining explosion-proof high-voltage frequency converter, an internal water circulation system and an external water circulation system exchange heat through a water-water plate type heat exchanger, and the external water circulation system comprises a water inlet flange interface and a water outlet flange interface; the water inlet flange interface and the water outlet flange interface are arranged on the side wall of the explosion-proof shell; the water inlet flange interface is connected with an external circulation water inlet of the water-water plate type heat exchanger, an external circulation water outlet of the water-water plate type heat exchanger is connected with a water inlet of the hot air water-cooling radiator, and a water outlet of the hot air water-cooling radiator is connected with the water outlet flange interface; the internal water circulation system comprises an internal circulation water pump and a frequency converter water-cooling radiator, an internal circulation water outlet of the water-water plate type heat exchanger is connected with an inlet of the internal circulation water pump, and an outlet of the internal circulation water pump is connected with an internal circulation water inlet of the water-water plate type heat exchanger through a water channel of the frequency converter water-cooling radiator; the cooling water circulated by the internal water circulation system is deionized water.
The power unit comprises a radiator for cooling power components, and the radiators of the power unit are connected in parallel to form the water-cooled radiator of the frequency converter; the water-water plate heat exchanger and the internal circulation water pump are arranged in the control and cooling chamber.
The output ends of the power units connected in series are connected with two groups of output terminals of the high-voltage frequency converter through two groups of contactor contacts, and the two groups of contactor contacts are connected in parallel.
The mining explosion-proof high-voltage frequency converter has the advantages that the alternating current input end of the power unit is six-phase input, and the output is single-phase.
The cable is a three-core non-explosion-proof cable, and each cable comprises 3 core wires.
The utility model discloses a mining flame-proof type high-voltage inverter is small, and power density is high.
[ description of the drawings ]
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is the utility model discloses mining flame-proof type high-voltage inverter major loop's circuit diagram.
FIG. 2 is the utility model discloses mining flame-proof type high-voltage inverter's inner structure arrangement diagram.
FIG. 3 is the utility model discloses mining flame-proof type high-voltage inverter's cooling water route system chart.
Fig. 4 is an electrical schematic diagram of a main circuit of a power unit according to an embodiment of the present invention.
Fig. 5 is a schematic block diagram of a power unit control circuit according to an embodiment of the present invention.
[ detailed description of the invention ]
The embodiment of the utility model provides a built-in high power density mining flame proof of moving rectifier transformer and safe type high-voltage inverter's of essence structure is shown as figure 1 to figure 3, and the rated output voltage of this type of converter can reach 10kV the most. The rated input voltage of the frequency converter is 10kV, and the frequency converter integrates 1 rectifying phase-shifting transformer, 12 power units, 1 control unit, 1 water-cooling unit and 24 three-core non-explosion-proof cables in a cavity of an explosion-proof shell. The cable between the rectification phase-shifting transformer and the power unit is directly a non-explosion-proof cable, so that the connection is more convenient, quick, safe and reliable, and meanwhile, the volume of the whole frequency converter is reduced, and the cost is reduced.
As shown in fig. 1, XP1 is a frequency converter input cable connector, a mining explosion-proof high-voltage connector plug is adopted, XS1 is a frequency converter input cable socket, a mining explosion-proof high-voltage connector socket is adopted, T is a rectifying phase-shifting transformer, a1-a4, B1-B4 and C1-C4 are three groups of power units connected in series, KM1 and KM2 are contacts of a high-voltage vacuum contactor, XS2 and XS3 are frequency converter output sockets, a mining explosion-proof high-voltage connector socket is adopted, XP2 and XP3 are frequency converter output cable plugs, and a mining explosion-proof high-voltage connector plug is adopted. The frequency converter adopts the mining explosion-proof high-voltage connector, so that the cable and the frequency converter can be quickly connected and separated, and the frequency converter is simple, quick and efficient to install and maintain. The output ends of the power units A1 to A4 are connected in series to form a U-phase voltage, the output ends of the power units B1 to B4 are connected in series to form a V-phase voltage, the output ends of the power units C1 to C4 are connected in series to form a W-phase voltage, and the output ends L1 of the power units A1, B1 and C1 are connected together to form the middle point of the frequency converter. The output terminals L2 of the power units a4, B4 and C4 are connected to KM1 and KM2, respectively. 2 operation modes of the frequency converter are realized by controlling the on and off of the KM1 and the KM 2: in the mode 1, the KM1 is controlled to be switched on and off by the KM2, and the frequency converter drives a motor; in the mode 2, the KM1 is controlled to be switched on by the KM2, the frequency converter realizes two-way output and drives 2 motors simultaneously; the power unit is six-phase input, the line voltage is 690V, the output is single phase, and the line voltage is 1380V. The output voltage of 1380V is adopted, so that the number of the frequency converter power units is reduced to 12 from the conventional 27 or 24. Through adopting this type power unit for the volume of this type converter cabinet body design is littleer, and power density is higher.
A11-C83 are connecting cables for connecting the power unit and the secondary winding of the rectification phase-shifting transformer, each cable comprises 3 core wires, the rated working voltage between the core wires is 690V, and the rated working voltage of the core wires to the ground is 10 kV.
As shown in fig. 2, 1 is a control and cooling cavity of the frequency converter, 3 is a power unit cavity, 4 is a rectification phase-shift transformer cavity, 5 is a control unit of the frequency converter, 8 is an internal cooling unit of the frequency converter, 9 is a power unit, 10 is a rectification phase-shift transformer, and 11 is a high-voltage vacuum contactor and a current detection component.
A cable through hole is designed on a partition plate between the power unit cavity 3 and the rectification phase-shifting transformer cavity 4, and a connecting cable for connecting the power unit and the secondary winding of the rectification phase-shifting transformer can penetrate through the through hole to be connected. Because the power unit and the rectifying phase-shifting transformer are simultaneously arranged in one explosion-proof cavity, the requirement can be met by selecting a common non-explosion-proof cable.
The power units in the power unit cavities are arranged in three rows, the left side column is provided with U-phase power units which are connected in series, A1, A2, A3 and A4 are sequentially arranged from bottom to top, the middle column is provided with V-phase power units which are connected in series, B1, B2, B3 and B4 are sequentially arranged from bottom to top, the right side column is provided with W-phase power units which are connected in series, C1, C2, C3 and C4 are sequentially arranged from bottom to top, the left side of the U phase is provided with an insulating part, the U phase and the V phase are provided with an insulating part, the V phase and the W phase are provided with an insulating part, and the right side of the W phase is provided with an.
The embodiment of the utility model provides a mining flame-proof type high-voltage inverter' S cooling water route system is as shown in figure 3, including interior water circulating system, outer water circulating system, interior water circulating system and outer water circulating system pass through water-water plate heat exchanger S and exchange the heat.
The external water circulation system comprises a water inlet flange interface F1 and a water outlet flange interface F2; the water inlet flange interface F1 and the water outlet flange interface F2 are arranged on the side wall of the explosion-proof shell and are respectively connected with a water source of external cooling water.
The transformer cooling device is arranged in a transformer cavity and comprises a fan F and a hot air water-cooling radiator R, the phase-shifting transformer T, the fan F and the hot air water-cooling radiator R are arranged in an air channel in the transformer cavity, and a water channel of the hot air water-cooling radiator R is connected in series in a water channel of an external water circulation system.
The water inlet flange interface F1 is connected with an external circulation water inlet of the water-water plate type heat exchanger S, an external circulation water outlet of the water-water plate type heat exchanger S is connected with a water inlet of the hot air water-cooling radiator R, a water outlet of the hot air water-cooling radiator R is connected with the water outlet flange interface F2, and the external circulation of cooling water is formed together with an external cooling water source.
The internal water circulation system comprises an internal water circulation pump P and a frequency converter water-cooling radiator, and an internal circulation water outlet of the water-water plate type heat exchanger S is connected with an inlet of the internal water circulation pump P.
Each power unit comprises a radiator B for cooling power components, the radiators B of the 12 power units are connected in parallel to form a water-cooled radiator of the frequency converter, and an outlet of the internal circulation water pump P is connected with an internal circulation water inlet of the water-plate type heat exchanger S through a water channel of the 12 power unit radiators B connected in parallel. The heat of the radiators of the 12 power units is brought into a water-water plate type heat exchanger S in the inner water circulation system through circulating deionized water in the inner water circulation system, is transferred to an outer water circulation system through the water-water plate type heat exchanger S, and is then radiated to common external cooling water by the outer water circulation system. A water-water plate heat exchanger S and an internal circulating water pump P are arranged in the control and cooling chamber 1 of the frequency converter.
The heat of the phase-shifting transformer is brought to the wind-water heat exchanger by circulating wind through the circulating air duct, and is transferred by the wind-water heat exchanger, and the heat is brought away by external common cooling water flowing through the hot air-water cooling radiator.
The utility model discloses above embodiment adopts water-cooling power unit for water-cooling power unit's radiator volume is littleer, thereby makes power unit volume reduce, has increased power density. The phase-shifting transformer adopts a wind-water heat exchange cooling mode, solves the contradiction between the volume and the cost, and ensures that the volume of a cavity of the phase-shifting transformer is smaller and the cost is not obviously improved.
The utility model discloses power unit, including two the same unit circuit, every unit circuit includes three-phase full-bridge rectifier circuit, direct current bus, full-bridge inverter circuit, switching power supply and control panel respectively.
The output end of the three-phase full-bridge rectification circuit is connected with the input end of the full-bridge inverter circuit through a direct current bus, and the output end of the full-bridge inverter circuit is the alternating current output end of the unit circuit.
The input end of the switch power supply is connected with the direct current bus, and the power supply input end of the control panel is connected with the output end of the switch power supply.
The control signal input end of the unit circuit control panel is externally connected with the control signal output end of the main control panel of the cascaded high-voltage frequency converter, and the 4 driving signal input ends of the full-bridge inverter circuit are respectively connected with the driving signal output end of the control panel. The alternating current output ends of the two unit circuits are connected in series and then serve as the alternating current output ends of the power unit.
The alternating current input end of the first unit circuit three-phase full-bridge rectification circuit is connected with a first three-phase alternating current power supply, and the alternating current input end of the second unit circuit three-phase full-bridge rectification circuit is connected with a second three-phase alternating current power supply.
The midpoint of the first half bridge of the full-bridge inverter circuit of the first unit circuit is connected with a first terminal of the alternating current output end of the power unit, and the midpoint of the first half bridge of the full-bridge inverter circuit of the second unit circuit is connected with a second terminal of the alternating current output end of the power unit. The midpoint of the second half bridge of the full-bridge inverter circuit of the first unit circuit is connected with the midpoint of the second half bridge of the full-bridge inverter circuit of the second unit circuit.
The midpoint connecting line of the second half bridge of the full-bridge inverter circuit of the two unit circuits is connected with the radiator through a grounding resistor. The radiator is shared by the two unit circuits and is used for radiating and cooling the main circuit power components of the two unit circuits.
The structure of the main circuit of the 1400V power unit of the embodiment of the present invention is shown in fig. 4, and includes two ac 700V three-phase power sources R1, S1, T1, R2, S2, and T2; two three-phase full-bridge rectifier modules BR1 and BR 2; 4 input fuses F11, F12, F13, F14; two thin film capacitors E1 and E2; two full bridge inverter circuits IGBT1 and IGBT 2.
The full-bridge inverter circuit IGBT1 includes two half-bridges IGBTL1 and IGBTL 2; the full-bridge inverter circuit IGBT2 includes two half-bridges IGBTR1, IGBTR 2.
The input of the power unit is two-way alternating current 700V three-phase power supply, wherein one way of 700V alternating current power supply R1, S1 and T1 is connected with a three-phase full-bridge rectification module BR1 through fuses F11 and F12, and is connected with an energy storage film capacitor E1 through a direct current bus after being rectified by BR1, the rear stage of the film capacitor E1 is connected with IGBT half-bridge IGBTL1 and IGBTR1, wherein the output of the half-bridge IGBTL1 is an alternating current output terminal L1 of the power unit, and the output end of the half-bridge IGBTR1 is connected with the output end of the other half-bridge IGBTL 2. The midpoint of the connection line between the half-bridge IGBTR1 and IGBTL2 is connected to the heat sink of the power cell via a ground resistor R1. And the other path of 700V alternating current power supplies R2, S2 and T2 are connected with a three-phase full-bridge rectifier module BR2 through fuses F13 and F14, are connected with an energy storage thin-film capacitor E2 through a direct current bus after being rectified by BR2, and are connected with an IGBT half-bridge IGBTL2 and an IGBTR2 through the thin-film capacitor E2, wherein the output of the half-bridge IGBTR2 is the other alternating current output terminal L2 of the power unit, and the output end of the half-bridge IGBTL2 is connected with the output end of the other half-bridge IGBTR 1. The utility model discloses power unit's output terminal L1, L2 output two way alternating current power supply sum is 1400V.
In the embodiment, the input of the main loop of the power unit is two-way alternating current 700V three-phase power supply, and the output is 1400V. The bus voltage of the main loop is 989V, but less than 1000V, and a power device with a low voltage level can be directly adopted. Three-phase full-bridge rectifier modules BR1 and BR2 of the power unit, 4 IGBT half-bridges IGBTL1, IGBTL2, IGBTR1 and IGBTR2 are uniformly installed on an integral radiator of the power unit, and a switch tube of the power unit is cooled by the radiator. The connection point of the two half-bridges IGBTR1 and IGBTL2 of the power unit is connected to a radiator through a grounding resistor R1, the maximum voltage difference of the two power supplies to the radiator is 989V, so that the power device of the main loop can use a power device with a low voltage grade, and the electrical insulation is only required to be carried out according to the low voltage grade.
The electrical principle of the 1400V power cell control circuit of the present embodiment is shown in fig. 5, which includes; two switching power supply boards (a switching power supply 1 and a switching power supply 2); two control panels (control panel 1 and control panel 2).
The input of the switching power supply 1 is connected with the direct-current bus voltage DC1+ and DC 1-of the first unit circuit, the output of the switching power supply 1 supplies power to the control board 1, and the control chip of the control board 1 drives 4 switching tubes of the full-bridge inverter circuit IGBT1 (two half-bridges IGBTL1 and IGBTR 1). The input of the switching power supply 2 is connected with the direct-current bus voltage DC2+ and DC 2-of the first unit circuit, the output of the switching power supply 2 supplies power to the control board 2, and the control chip of the control board 2 drives 4 switching tubes of the full-bridge inverter circuit IGBT2 (two half-bridges IGBTL2 and IGBTR 2). The main control board of the cascade high-voltage frequency converter is communicated with the two control boards of the power unit, the two control boards of the power unit output PWM waveforms, the PWM waveforms output by the two control boards control the on and off of the switching tubes of the two full-bridge inverter circuits IGBT1 and IGBT2(4 IGBT half-bridges IGBTL1, IGBTL2, IGBTR1 and IGBTR2), the output waveform of the first full-bridge inverter circuit IGBT1 and the output waveform of the second full-bridge inverter circuit IGBT2 have a certain phase difference, the power unit output terminals L1 and L2 realize single-phase multi-level voltage waveform with adjustable output voltage, and the output voltage of the power unit L1 and L2 reaches 1400V by adjusting the phase difference between the output waveform of the first full-bridge inverter circuit IGBT1 and the output waveform of the second full-bridge inverter circuit IGBT 2.
The utility model discloses the 1400V power unit of above embodiment, the structure of major loop not only can provide high-quality solution for power unit's miniaturization, and the power unit quantity that is the complete machine simultaneously reduces. And an effective solution is provided for the integration and miniaturization of the whole high-voltage variable-frequency speed regulator.

Claims (8)

1. A mining explosion-proof high-voltage frequency converter comprises an explosion-proof shell, a phase-shifting transformer, a conversion circuit, a control unit and a cooling system, wherein the conversion circuit comprises a plurality of groups of power units which are connected in series, and the alternating current input end of each power unit is connected with the three-phase output end of the low-voltage side of the phase-shifting transformer through a cable; the partition plate between the transformer cavity and the power unit cavity comprises a cable through hole, and the cable penetrates through the cable through hole to connect the phase-shifting transformer and the power unit; the control unit and parts of the cooling system are arranged in the control and cooling chamber.
2. The mining flameproof high-voltage frequency converter according to claim 1, wherein the cooling system comprises an inner water circulation system, an outer water circulation system and a transformer cooling device, the transformer cooling device is installed in the transformer cavity, and a water path of the transformer cooling device is connected in series with a water path of the outer water circulation system.
3. The mining flameproof high-voltage frequency converter according to claim 2, wherein the transformer cooling device comprises a fan and a hot air water-cooled radiator, the phase-shifting transformer, the fan and the hot air water-cooled radiator are arranged in an air duct inside a transformer cavity, and a water channel of the hot air water-cooled radiator is connected in series in a water channel of an external water circulation system.
4. The mining flameproof high-voltage frequency converter according to claim 3, wherein an internal water circulation system and an external water circulation system exchange heat through a water-water plate heat exchanger, and the external water circulation system comprises a water inlet flange interface and a water outlet flange interface; the water inlet flange interface and the water outlet flange interface are arranged on the side wall of the explosion-proof shell; the water inlet flange interface is connected with an external circulation water inlet of the water-water plate type heat exchanger, an external circulation water outlet of the water-water plate type heat exchanger is connected with a water inlet of the hot air water-cooling radiator, and a water outlet of the hot air water-cooling radiator is connected with the water outlet flange interface; the internal water circulation system comprises an internal circulation water pump and a frequency converter water-cooling radiator, an internal circulation water outlet of the water-water plate type heat exchanger is connected with an inlet of the internal circulation water pump, and an outlet of the internal circulation water pump is connected with an internal circulation water inlet of the water-water plate type heat exchanger through a water channel of the frequency converter water-cooling radiator; the cooling water circulated by the internal water circulation system is deionized water.
5. The mining explosion-proof high-voltage frequency converter according to claim 4, wherein the power unit comprises a radiator for cooling power components, and the radiator of the power unit is connected in parallel to form the water-cooled radiator of the frequency converter; the water-water plate heat exchanger and the internal circulation water pump are arranged in the control and cooling chamber.
6. The mining explosion-proof high-voltage frequency converter according to claim 1, wherein the output ends of the plurality of groups of series-connected power units are connected with two groups of output terminals of the high-voltage frequency converter through two groups of contactor contacts, and the two groups of contactor contacts are connected in parallel.
7. The mining flameproof high-voltage frequency converter according to claim 1, wherein the alternating current input end of the power unit is six-phase input, and the output is single phase.
8. The mining flameproof high-voltage frequency converter according to claim 1, wherein the cables are three-core non-flameproof cables, each cable comprising 3 core wires.
CN201921741314.1U 2019-10-16 2019-10-16 Mining explosion-proof type high-voltage frequency converter Active CN210807085U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921741314.1U CN210807085U (en) 2019-10-16 2019-10-16 Mining explosion-proof type high-voltage frequency converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921741314.1U CN210807085U (en) 2019-10-16 2019-10-16 Mining explosion-proof type high-voltage frequency converter

Publications (1)

Publication Number Publication Date
CN210807085U true CN210807085U (en) 2020-06-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201921741314.1U Active CN210807085U (en) 2019-10-16 2019-10-16 Mining explosion-proof type high-voltage frequency converter

Country Status (1)

Country Link
CN (1) CN210807085U (en)

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