CN216774598U - Compact-structure mining high-voltage explosion-proof frequency converter device - Google Patents
Compact-structure mining high-voltage explosion-proof frequency converter device Download PDFInfo
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- CN216774598U CN216774598U CN202220140000.1U CN202220140000U CN216774598U CN 216774598 U CN216774598 U CN 216774598U CN 202220140000 U CN202220140000 U CN 202220140000U CN 216774598 U CN216774598 U CN 216774598U
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Abstract
The utility model relates to a mining high-voltage explosion-proof frequency converter device with a compact structure, which comprises an explosion-proof shell, and a phase-shifting transformer, a power unit, an isolation transformer, a transformer cooling device, a unit water cooler, an insulating frame and a control system which are arranged in the explosion-proof shell, wherein the input end of the phase-shifting transformer is connected with a power supply, the power unit is connected with the output end of the phase-shifting transformer, the power unit is fixed on the insulating frame, and the output end of the power unit outputs an alternating current power supply after frequency conversion through the isolation transformer; the transformer cooling device is used for dissipating heat of the phase-shifting transformer, and the unit water cooler is used for dissipating heat of the power unit in a water cooling mode. According to the explosion frequency converter device, the phase-shifting transformer, the power unit, the control system and the cooling system are integrated into one explosion-proof shell, so that the problems that connecting cables between cavities are too long and the structural design is complex when the high-voltage explosion-proof frequency converter is designed in a cavity-dividing mode are solved, and the underground transportation and installation of equipment are facilitated.
Description
Technical Field
The utility model relates to a frequency converter device, in particular to a mining high-voltage explosion-proof frequency converter device with a compact structure.
Background
The underground power supply voltage grades of the coal mine are 10kV, 6kV, 3.3kV, 1140V, 660V and 127V. The majority of the current underground variable frequency speed regulating devices are 660V, 1140V and 3300V voltage levels. In China, high-voltage explosion-proof frequency converters of 6KV and above are rarely applied underground. The ground high-voltage frequency converter is widely applied, the technology is mature, but the technology has no explosion-proof capability and cannot be applied to underground coal mines. The ground high-voltage frequency converter has large installation space and sufficient layout space, and can meet the heat dissipation requirement by adopting an air cooling structure. The high-voltage explosion-proof frequency converter can not meet the heat dissipation requirement due to special requirements of air cooling. Along with the rapid development of industry, the intelligent mine has more and more requirements on 6KV and 10KV of entering well voltage, the occasions adopting high-voltage high-power motors are gradually increased, and the high-voltage explosion-proof frequency converter is adopted to start and regulate the speed of a high-power load, so that the impact of the starting of high-power equipment on a power grid can be reduced, the equipment can also run in the best state, and the requirement of energy conservation is met.
At present, two common structural forms of the high-voltage explosion-proof frequency converter are adopted, one is a split structural design, namely an explosion-proof shell is independently designed for the phase-shifting transformer, and a natural heat dissipation cooling mode is adopted. The volume of the high-voltage explosion-proof frequency converter is increased, the cost is increased, and the popularization is not facilitated. One is an integrated structure, and adopts a water-cooled transformer. The water-cooled transformer has high cost, serious consequences can be brought after water leakage occurs, the volume of the water-cooled transformer is large, the size of a product monomer is large, and the transportation and installation in a well are inconvenient.
Disclosure of Invention
In order to overcome the defects of the technical problems, the utility model provides a mining high-voltage explosion-proof frequency converter device with a compact structure.
The utility model discloses a mining high-voltage explosion-proof frequency converter device with a compact structure, which is characterized in that: the control contactor, the phase-shifting transformer, the power unit, the isolation transformer, the transformer cooling device, the unit water cooling machine, the insulating frame and the control system are arranged in the explosion-proof shell, the input end of the phase-shifting transformer is connected with a power supply, the power unit is connected with the output end of the phase-shifting transformer, the power unit is fixed on the insulating frame, the power unit carries out frequency conversion, and the output end of the power unit outputs an alternating current power supply after frequency conversion through the isolation transformer; the transformer cooling device dissipates heat to the phase-shifting transformer in a mode of combining air cooling and water cooling, the unit water cooler dissipates heat to the power unit in a water cooling mode, and the control system is used for controlling the operation of the whole frequency converter device.
The high-voltage explosion-proof frequency converter device for the mine, which is compact in structure, is characterized in that the insulating frame, the power unit, the unit water cooler and the control system are arranged at the front half part of the inner cavity of the explosion-proof shell, and the phase-shifting transformer, the transformer cooling device, the isolation transformer and the control contactor are arranged at the rear half part of the inner cavity of the explosion-proof shell.
The mining high-voltage explosion-proof frequency converter device with the compact structure comprises a transformer cooling device, a water-air heat exchanger, a heat dissipation fan and an air supply channel, wherein an air outlet of the water-air heat exchanger is communicated with an air inlet of a phase-shifting transformer through the air supply channel, and an air outlet of the phase-shifting transformer is connected with the air inlet of the water-air heat exchanger.
The mining high-voltage explosion-proof frequency converter device with the compact structure is characterized in that a power unit consists of a rectifying bus bar, a finishing part, an inverting bus bar, an inverting part, a filter circuit and a unit control board, wherein the finishing part and the filter circuit are connected to the rectifying bus bar, the inverting part is connected to the inverting bus bar, and the unit control board is used for controlling the operation of the inverting part; when the frequency converter device is connected with a 10kV or 6kV power supply, each phase adopts a mode that 4 power units are connected in series; when the frequency converter device is connected with a 3.3kV power supply, each phase adopts a mode of connecting 2 power units in parallel; each power unit adopts a double H-bridge circuit.
The mining high-pressure explosion-proof frequency converter device with the compact structure is characterized in that the unit cooling water machine is composed of a main circulating system, a cooling plate, a valve group outlet pipeline, a valve group inlet pipeline and a unit connecting pipeline, a cooling water outlet of the main circulating system is communicated with a cooling water inlet of the power unit through the valve group outlet pipeline, a cooling water outlet of the power unit is communicated with a cooling water inlet of the main circulating system through the valve group inlet pipeline, and the cooling plate cools and dissipates cooling water of the unit cooling water machine.
The utility model has the beneficial effects that: the mining high-voltage explosion-proof frequency converter device with the compact structure has the following beneficial effects:
(1) the phase-shifting transformer, the power unit, the control system and the cooling system are integrated into one explosion-proof shell, so that the problems that connecting cables between cavities are too long and the structural design is complex when the high-voltage explosion-proof frequency converter is designed in a cavity-dividing mode are solved, and the electromagnetic interference caused by too many cables is reduced; and the equipment is convenient to transport and install underground.
(2) The water-cooling phase-shifting transformer and the power unit are cooled by water, so that the heat dissipation performance of the high-voltage explosion-proof frequency converter is improved.
(3) The phase-shifting transformer adopts a mode of combining air and water cooling by adopting a transformer cooling device, so that the phase-shifting transformation volume is reduced, the heat dissipation efficiency of the transformer is improved, and the size of the whole frequency converter device is reduced.
(4) The explosion-proof shell can be compatible with products with different voltage levels of 3.3kV, 6kV and 10kV on the premise of not changing the explosion-proof shell.
Drawings
FIG. 1 is a front view of a compact mining high-voltage explosion-proof frequency converter device according to the utility model;
FIG. 2 is a top view of the compact mining high-voltage explosion-proof frequency converter device of the utility model;
FIG. 3 is a cross-sectional view of section A-A of FIG. 1;
FIG. 4 is a schematic diagram of the heat dissipation of the transformer cooling device according to the present invention;
FIG. 5 is a front view of a power cell of the present invention;
FIG. 6 is a bottom view of the power unit of the present invention;
FIG. 7 is a left side view of the power unit of the present invention;
FIG. 8 is a schematic view of a unit water chiller according to the present invention.
In the figure: 1 explosion-proof shell, 2 power units, 3 phase-shifting transformers, 4 control systems, 5 units of cooling water machines, 6 transformer cooling devices, 7 insulating frames, 8 isolation transformers, 9 control contactors and 10 air supply channels; 2.1 inversion part, 2.2 rectification part, 2.3 inversion bus bar, 2.4 rectification bus bar, 2.5 unit control board and 2.6 filter capacitor; 5.1 main circulating system, 5.2 cooling plates, 5.3 play valves pipeline, 5.4 income valves pipeline, 5.5 unit connecting line.
Detailed Description
The utility model is further described with reference to the following figures and examples.
As shown in fig. 1 and fig. 2, a front view and a top view of a compact mining high-voltage explosion-proof frequency converter device of the utility model are provided, fig. 3 is a sectional view of a section a-a in fig. 1, the high-voltage explosion-proof frequency converter comprises an explosion-proof shell 1, an insulating frame 7 arranged in the explosion-proof shell 1, a control contactor 9, a phase-shifting transformer 3, a power unit 2, an isolation transformer 8, a unit water cooler 5, a transformer cooling device 6 and a control system 4, and the explosion-proof shell 1 plays a role in fixing and supporting and has an explosion-proof isolation function so as to meet application requirements of underground coal mines. The input end (primary side) of the phase-shifting transformer 3 is connected with a power supply (such as 3.3kV, 6kV or 10 kV) through a control contactor 9, and the control contactor 9 is used for controlling the on-off of the power supply; the power unit 2 is connected to the output end (secondary side) of the phase-shifting transformer 3, and the power unit 2 rectifies and inverts the input alternating current to form alternating current with required frequency and outputs the alternating current to the load through the isolation transformer 8.
The power unit 2 is arranged on the insulating frame 7, so that the power unit 2 achieves the effect of isolated installation, and the insulation of the device and the explosion-proof shell 1 in a high-voltage environment is ensured. The phase-shifting transformer 3, the transformer cooling device 6, the isolation transformer 8 and the control contactor 9 are arranged at the rear half part of the explosion-proof shell 1; the power unit 2, the control system 4, the unit cooling water machine 5 and the insulating frame 7 are assembled at the front half part of the explosion-proof shell 1. And a rear door is arranged on the explosion-proof shell 1 at the positions of the isolation transformer 7 and the main loop control contactor 8 so as to facilitate placement and later maintenance.
Therefore, the phase-shifting transformer 3, the power unit 2, the control system 4 and the cooling system (the unit cooling water machine 5 and the transformer cooling device) are integrated into one explosion-proof shell, so that the problems of overlong connecting cables between cavities and complex structural design during cavity-dividing design of the high-voltage explosion-proof frequency converter are solved, and the electromagnetic interference caused by excessive cables is reduced.
As shown in fig. 4, a heat dissipation schematic diagram of the transformer cooling device of the present invention is shown, the transformer cooling device 5 is disposed on the top of the phase-shifting transformer 3, and heat generated by the phase-shifting transformer 3 during operation is pumped into the cooling device by a heat dissipation fan in the top transformer cooling device 5 in an air draft manner. The water-air heat exchanger in the cooling device is internally communicated with cooling water, and the cooling water cools the pumped hot air. The cooled air is sent into the cavity by the fan, and due to the negative pressure effect, the cooling air enters the air inlet of the phase-shifting transformer 3, so that the heat dissipation of the phase-shifting transformer 3 is realized through the reciprocating circulation.
As shown in fig. 5, fig. 6 and fig. 7, a front view, a bottom view and a left view of the power unit of the present invention are respectively provided, the power unit 2 is designed by adopting a modular double H-bridge structure, and the unit is composed of an inverter portion 2.1, a rectifier portion 2.2, an inverter bus bar 2.3, a rectifier bus bar 2.4, a unit control board 2.5 and a filter capacitor 2.6. When the device is used for 10kV and 6kV, 4 power units 2 are used for each phase, each power unit 2 adopts a double H bridge, the units are connected in series, and one unit is equivalent to two units. When 3.3kV is used in the same power grade, 3 power units 2 are adopted in each phase, the power modules are used in parallel, and the inversion busbars 2.3 on the units are connected in parallel by copper bars. The current carrying capacity of the unit is increased, and the required power requirement is met. Therefore, the structure of the power unit 2 is uniform and the explosion-proof shell 1 is uniform in the whole device. The modular design of the power unit 2 facilitates maintenance of the unit.
As shown in fig. 8, a schematic diagram of a unit water chiller 5 according to the present invention is shown, and the unit water chiller 5 is composed of a main circulation system 5.1, a cooling plate exchanger 5.2, a valve group inlet pipeline 5.4, a valve group outlet pipeline 5.3, and a unit connecting pipeline 5.5. The main circulation system provides deionized water for the power unit 2, the deionized water enters the water cooling plate of the single power unit 2 through the valve group inlet pipeline 5.4 and the unit connecting pipeline 5.5, and the deionized water enters the cooling plate through the valve group outlet pipeline 5.3 after absorbing heat to exchange energy by 5.2. The cooling plate 5.2 is assembled on the explosion-proof shell 1, and cooling water is introduced from the outside to exchange heat to the outside.
Claims (5)
1. The utility model provides a compact structure type mining high-pressure explosion-proof frequency converter device which characterized in that: the explosion-proof power supply comprises an explosion-proof shell (1), and a control contactor (9), a phase-shifting transformer (3), a power unit (2), an isolation transformer (8), a transformer cooling device (6), a unit cooling water machine (5), an insulating frame (7) and a control system (4) which are arranged in the explosion-proof shell, wherein the input end of the phase-shifting transformer is connected with a power supply, the power unit is connected with the output end of the phase-shifting transformer, the power unit is fixed on the insulating frame and carries out frequency conversion, and the output end of the power unit outputs an alternating current power supply after frequency conversion through the isolation transformer; the transformer cooling device dissipates heat to the phase-shifting transformer in a mode of combining air cooling and water cooling, the unit water cooler dissipates heat to the power unit in a water cooling mode, and the control system is used for controlling the operation of the whole frequency converter device.
2. The mining high-voltage explosion-proof frequency converter device with the compact structure according to claim 1, characterized in that: the insulation frame (7), the power unit (2), the unit water cooling machine (5) and the control system (4) are arranged in the front half part of the inner cavity of the explosion-proof shell (1), and the phase-shifting transformer (3), the transformer cooling device (6), the isolation transformer (8) and the control contactor (9) are arranged in the rear half part of the inner cavity of the explosion-proof shell.
3. The mining high-voltage explosion-proof frequency converter device with the compact structure according to claim 1 or 2, characterized in that: the transformer cooling device (6) is composed of a water-air heat exchanger, a cooling fan and an air supply channel (10), an air outlet of the water-air heat exchanger is communicated with an air inlet of the phase-shifting transformer (3) through the air supply channel (10), and an air outlet of the phase-shifting transformer is connected with the air inlet of the water-air heat exchanger.
4. The mining high-voltage explosion-proof frequency converter device with the compact structure according to claim 1 or 2, characterized in that: the power unit (2) consists of a rectifying bus bar (2.4), a sorting part (2.2), an inversion bus bar (2.3), an inversion part (2.1), a filter circuit (2.6) and a unit control board (2.5), wherein the sorting part and the filter circuit are connected to the rectifying bus bar, the inversion part is connected to the inversion bus bar, and the unit control board is used for controlling the operation of the inversion part; when the frequency converter device is connected with a 10kV or 6kV power supply, each phase adopts a mode that 4 power units (2) are connected in series; when the frequency converter device is connected with a 3.3kV power supply, each phase adopts a mode that 2 power units (2) are connected in parallel; each power unit adopts a double H-bridge circuit.
5. The mining high-voltage explosion-proof frequency converter device with the compact structure according to claim 1 or 2, characterized in that: unit cooling water machine (5) comprises main circulation system (5.1), cooling plate (5.2), play valves pipeline (5.3), advance valves pipeline (5.4) and unit connection pipeline (5.5), and main circulation system's cooling water export is linked together through the cooling water inlet of play valves pipeline and power unit (2), and power unit's cooling water export is linked together through the cooling water inlet of advancing valves pipeline and main circulation system, and the cooling plate cools down the heat dissipation to unit cooling water machine's cooling water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220140000.1U CN216774598U (en) | 2022-01-19 | 2022-01-19 | Compact-structure mining high-voltage explosion-proof frequency converter device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220140000.1U CN216774598U (en) | 2022-01-19 | 2022-01-19 | Compact-structure mining high-voltage explosion-proof frequency converter device |
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| Publication Number | Publication Date |
|---|---|
| CN216774598U true CN216774598U (en) | 2022-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220140000.1U Active CN216774598U (en) | 2022-01-19 | 2022-01-19 | Compact-structure mining high-voltage explosion-proof frequency converter device |
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| Country | Link |
|---|---|
| CN (1) | CN216774598U (en) |
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- 2022-01-19 CN CN202220140000.1U patent/CN216774598U/en active Active
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