Two-quadrant controllable rectification explosion-proof frequency converter unit and multi-application explosion-proof frequency converter

Abstract

The utility model discloses a two-quadrant controllable rectification explosion-proof frequency converter unit and a multi-application explosion-proof frequency converter. The two-quadrant controllable rectification explosion-proof frequency converter unit comprises a water cooling radiator, a two-quadrant controllable rectification frequency converter, a four-quadrant inversion frequency converter, a frequency converter unit control assembly, a plurality of supporting film capacitors, a direct current laminated vulcanization bus and an overvoltage balance resistor. The multi-application explosion-proof frequency converter comprises a two-quadrant controllable rectification explosion-proof frequency converter unit, an input control loop system, a rectification input filtering system, a man-machine control interface, an expansion support capacitor assembly, a PLC control assembly, a control system power supply assembly and a voltage monitoring system. According to the utility model, a two-quadrant topology principle is adopted, and rectification control can be realized through diode triggering control, so that a four-quadrant function can be realized, the investment of power devices is greatly reduced, and the overall cost can be effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a two quadrant controllable rectification multi-application explosion -proof frequency converter, especially a two quadrant controllable rectification multi-application explosion -proof frequency converter for ACD product series of coal mine downhole explosion -proof environment. BACKGROUND

[0002] Because of the existence of gas, coal dust and other flammable and explosive substances in the coal mine environment, once encountering electric spark, friction spark or high temperature heat source, it may cause an explosion accident. Therefore, in order to ensure the safety of coal mine production and prevent gas and coal dust explosion accidents, strict explosion-proof measures must be taken in coal mine. With the increasing scale of coal mines and the increasing degree of automation, a large number of high-power electrical equipment is needed, and the increase in power has caused great changes in the original control and use of some equipment. Explosion -proof frequency converter is used in high-risk environments such as coal mines, and the application scenarios are very wide. The two-quadrant frequency converter can only realize the operation of the positive and negative rotation of two quadrants, cannot realize the speed reduction and acceleration control, cannot realize the bidirectional flow of energy, and cannot send the energy feedback by the motor back to the power grid. Using four-quadrant frequency converter, the whole machine cost is high, for different application occasions, it is necessary to improve the application efficiency while effectively reducing the production cost of the product. SUMMARY

[0003] According to the deficiencies of the prior art, the utility model provides a two-quadrant controllable rectification explosion -proof frequency converter unit and multi-application explosion -proof frequency converter, adopts two-quadrant topology principle, diode trigger controllable rectification control, that is, four-quadrant function can be realized, and the investment of power devices is greatly reduced, and the overall cost can be effectively reduced.

[0004] The utility model realizes the following technical scheme:

[0005] Firstly, the utility model provides a two-quadrant controllable rectification explosion -proof frequency converter unit, which comprises:

[0006] Water-cooled radiator;

[0007] The two-quadrant controllable rectification frequency converter for realizing controllable rectification function is fixed on the water-cooled radiator;

[0008] The four-quadrant inverter frequency converter for realizing inverter function is fixed on the water-cooled radiator;

[0009] The frequency converter unit control assembly is fixed on the left and right side supports of the main circuit of the frequency converter, and controls the entire two-quadrant controllable rectifier explosion-proof frequency converter unit.

[0010] The plurality of supporting film capacitors are installed on the right side support and used for absorbing and buffering the overvoltage of the bus.

[0011] The DC laminated vulcanization bus realizes the electrical connection of the rectification DC end, the inversion DC end and the supporting film capacitor.

[0012] The overvoltage balancing resistor is fixed on the water-cooled radiator and electrically connected to the DC end of the frequency converter, and absorbs and balances the DC bus voltage.

[0013] In some embodiments, the two-quadrant controllable rectifier frequency converter comprises three sets of diode modules and three sets of control driving board card systems.

[0014] In some embodiments, the four-quadrant inversion frequency converter comprises three sets of nine IGBT power modules and a matching driving board card system.

[0015] In some embodiments, the frequency converter unit control assembly comprises a master control board card, an IO expansion board card, a PT100 temperature measurement board card and an optical fiber distribution board.

[0016] In the second aspect, the utility model provides a kind of multi-application explosion-proof frequency converter, comprising:

[0017] The two-quadrant controllable rectifier explosion-proof frequency converter unit described above;

[0018] The input control circuit system is installed in the internal cavity of the frequency converter and comprises an isolation commutating switch, an AC input contactor and a pre-charge control circuit.

[0019] The rectification input filter system is installed in the internal cavity of the frequency converter and comprises an input filter reactor, a plurality of magnetic rings and a resistance-capacitance filter circuit.

[0020] The man-machine control interface is installed on the front door panel of the frequency converter and comprises a display screen and an input instruction component.

[0021] The expansion supporting capacitor assembly is installed in the internal cavity of the frequency converter and provides capacitor capacity expansion for the frequency converter.

[0022] The PLC control assembly is installed in the internal cavity of the frequency converter.

[0023] The control system power supply assembly is installed in the internal cavity of the frequency converter and provides power input for the control system.

[0024] The voltage monitoring system is composed of a voltage detection module and installed on the front door panel of the frequency converter, for detecting whether there is residual voltage in the internal cavity of the frequency converter.

[0025] In some embodiments, the isolation commutating switch is used as a frequency converter power control device, the frequency converter input control is realized by on-off isolation commutating switch, and the isolation commutating switch is fixed in a cavity designed separately for the frequency converter by bolts; the AC input contactor controls power transmission of a two-quadrant controllable rectifier explosion-proof frequency converter unit main loop, the main loop is rapidly turned on and off through signal control, and the AC input contactor is fixedly installed in the upper rear area of the reactor cavity; the pre-charging control loop realizes the main loop pre-charging function, is connected in parallel in front of and behind the AC input contactor, and is fixedly installed on the side of the AC input contactor.

[0026] In some embodiments, the input filter reactor and the resistance-capacitance filter circuit realize filtering of the input end of the two-quadrant controllable rectifier frequency converter unit; the input filter reactor is fixed in the reactor cavity in the rear lower side of the internal cavity of the frequency converter by bolts; the resistance-capacitance filter circuit is realized in series and parallel with the reactor, the plurality of magnetic rings realize interference shielding of the input end to the frequency converter, and are fixedly installed on the three-phase input cable at the front end of the reactor.

[0027] In some embodiments, the input instruction component includes intrinsic safety UPS keys, buttons and knobs; data information in the display screen is input and controlled through the intrinsic safety UPS keys, and the buttons and knobs are used to realize local control of remote control, start and stop.

[0028] In some embodiments, the expansion support capacitor assembly includes a metal mounting plate, a support thin film capacitor and a direct current laminated bus; the thin film capacitor and the direct current laminated bus are connected to each other by bolts and then fixed on the metal mounting plate.

[0029] In some embodiments, the PLC control assembly includes a PLC module, a relay, an isolation module, a terminal and a relay isolation plate; the control system power supply assembly includes a transformer, a filter, a switching power supply and an energy storage capacitor; the transformer takes power from the input end of the main loop to provide power input for the entire control system; the filter is used for control system interference; the energy storage capacitor provides short-time power failure buffering for the control system; and the switching power supply provides a driving power supply for the two-quadrant controllable rectifier explosion-proof frequency converter unit.

[0030] The utility model has the advantages of:

[0031] The utility model provides a kind of two quadrant controllable rectification explosion-proof frequency converter unit and multiple application explosion-proof frequency converter, using two quadrant topology principle, diode trigger controllable realization rectification control, four quadrant function can be realized, greatly reduce the input of power device, can effectively reduce overall cost, simultaneously by removing two quadrant controllable rectification control drive board card system, further reduce application cost, compatible two quadrant uncontrolled diode topology principle's system application, flexible switching, guarantee system performance, adapt to multiple application environments, simultaneously incorporate LCR integrated filter, PLC control system, remove separate input filter device and PLC device cabinet body, greatly reduce overall product cost, improve space utilization, solve installation, maintenance difficult problem. BRIEF DESCRIPTION OF DRAWINGS

[0032] The accompanying drawings are included to provide a further understanding of the present utility model, and are incorporated in and constitute apart of this present utility model specification. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model, but do not constitute improper limitation on the present utility model. Obviously, the drawings described below are only some embodiments, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0033] In the drawings:

[0034] Figure 1 Structure diagram of the multiple application explosion-proof frequency converter of the utility model Figure 1 ;

[0035] Figure 2 Structure diagram of the multiple application explosion-proof frequency converter of the utility model Figure 2 ;

[0036] Figure 3 Structure diagram of the two quadrant controllable rectification explosion-proof frequency converter unit of the utility model

[0037] Figure 4 Structure diagram of the rectification input filter system of the utility model

[0038] Figure 5 Structure diagram of the PLC control assembly of the utility model.

[0039] It should be noted that these drawings and written description are not intended to limit the scope of the concept of the present utility model in any way, but to illustrate the concept of the present utility model to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments will be clearly and completely described below in combination with the drawings in the embodiments of the utility model, the following embodiments are used to illustrate the utility model, but not to limit the scope of the utility model.

[0041] In the description of the utility model, it needs to be explained that the orientation or position relation indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer" and the like is the orientation or position relation based on the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model.

[0042] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be mechanical connection, or electrical connection, it can be directly connected, or indirectly connected through intermediate medium.

[0043] As shown in Figure 1 、 Figure 2 The utility model provides a kind of two quadrant controllable rectification multi-application explosion-proof frequency converter, including input control loop system 1, rectification input filter system 2, two quadrant controllable rectification explosion-proof frequency converter unit 3, man-machine control interface 4, expansion support capacitor component 5, PLC control component 6, control system power component 7, voltage monitoring system 8.Input control loop system 1 includes isolation commutating switch 101, AC input contactor 102, pre-charge control loop 103 etc., rectification input filter system 2 includes input filter reactor 201, resistance-capacitance filter circuit 202, multiple magnetic rings 203 etc.;Two quadrant controllable rectification explosion-proof frequency converter unit 3 includes water-cooled radiator 201, two quadrant controllable rectification frequency converter 202, four quadrant inverter frequency converter 203, frequency converter unit control component 204, support thin film capacitor 205, AC-DC laminated vulcanization bus 206;Man-machine control interface 4 includes display screen, intrinsic safety UPS button, button, knob etc.;Expansion support capacitor component 5 includes support thin film capacitor, DC laminated bus etc.;PLC control component 6 includes PLC module 601, relay 602, isolation module 603, terminal 604, relay isolation plate 605 etc.;Control system power component 7 includes transformer, filter, switching power supply, energy storage capacitor etc.Voltage monitoring system 8 is composed of voltage detection module.

[0044] The input control loop system is further described as follows.

[0045] As shown in Figure 1 , Figure 4 , the input control loop system 1 comprises an isolation commutating switch 101, an AC input contactor 102, a pre-charge control loop 103, etc. The isolation commutating switch 101 is used as the whole frequency converter power supply control device, and the whole frequency converter input control is realized by turning on and off the isolation commutating switch 101. The isolation commutating switch 101 is fixed in the left single designed cavity by bolts. The AC input contactor 102 controls the power supply of the two-quadrant controllable rectifier explosion-proof frequency converter unit 3 main circuit, and the main circuit fast on-off is realized by signal control. The AC input contactor 102 is fixedly installed in the upper rear area of the reactor cavity. The pre-charge control loop 103 realizes the main circuit pre-charge function, reduces the large capacity impact on the frequency converter system caused by instantaneous power-on, protects the power device, improves the service life, and is connected in parallel in front and rear of the AC input contactor 102, and is fixedly installed on the right side of the AC input contactor 102.

[0046] The rectifier input filter system is further described as follows.

[0047] The rectifier input filter system 2 comprises an input filter reactor 201, a plurality of magnetic rings 202, a resistance-capacitance filter circuit 203, etc. The input filter reactor 201 and the resistance-capacitance filter circuit 203 realize the filtering of the input end of the two-quadrant controllable rectifier frequency converter unit 3. The input filter reactor 201 is fixed by bolts in the lower rear of the reactor cavity. The resistance-capacitance filter circuit 203 is realized by series and parallel with the reactor. The plurality of magnetic rings 203 realize the interference shielding of the input end to the frequency converter system, and are fixedly installed in the front three-phase input cable of the reactor.

[0048] The two-quadrant controllable rectifier explosion-proof frequency converter unit is further described as follows.

[0049] As shown in Figure 3As shown, the two-quadrant controllable rectifier explosion-proof frequency converter unit 3 comprises a water-cooled radiator 301, a two-quadrant controllable rectifier frequency converter 302, a four-quadrant inverter frequency converter 303, a frequency converter unit control assembly 304, a supporting thin film capacitor 305, a direct current laminated vulcanization bus 306, and an overvoltage balancing resistor 307. The water-cooled radiator 301 is made of metal materials consistent with the shell and optimized by processing in accordance with the explosion-proof requirements of underground coal mines, and is used as the back door plate of the frequency converter cavity. The two-quadrant controllable rectifier frequency converter 302 comprises three groups of diode modules and three groups of control drive board card systems, and realizes the two-quadrant controllable rectification function of the system. If the application scene does not need to control the diode, the three groups of control drive board card systems can be removed to further reduce the product cost. The four-quadrant inverter frequency converter 203 comprises three groups of nine IGBT power modules and a matching drive board card system, and uses a standard three-level four-quadrant topology principle frequency converter. The frequency converter unit control assembly 304 comprises a main control board, an IO expansion board, a PT100 temperature measurement board, and an optical fiber distribution board, and realizes the system control of the entire two-quadrant controllable rectifier explosion-proof frequency converter unit 3. The supporting thin film capacitor 305 is electrically connected to the rectification direct current end and the inverter direct current end, and can effectively reduce the system overvoltage. After the two-quadrant controllable rectifier explosion-proof frequency converter unit 3 is assembled, it is fixedly installed at the rear door position of the frequency converter cavity and can be rotated and opened from the rear side.

[0050] The man-machine control interface is further described as follows.

[0051] The man-machine control interface 4 comprises a display screen, an intrinsically safe UPS button, a button, a knob, and the like. The display screen is used to realize the man-machine control of the frequency converter data. The intrinsically safe UPS button is used to input and control the data information in the display screen. The button and the knob are used to realize the on-site control of other remote control, start, stop, and the like. The man-machine control interface 4 is installed on the front door plate of the frequency converter cavity.

[0052] The expansion support capacitor assembly is further described as follows.

[0053] The expansion support capacitor assembly 5 comprises a metal mounting plate, a supporting thin film capacitor, and a direct current laminated bus. The supporting thin film capacitor and the direct current laminated bus are connected to each other by bolts and fixed on the metal mounting plate to provide capacitor capacity expansion for the entire frequency converter system. The expansion support capacitor assembly 5 is fixedly installed at the lower part of the front end of the frequency converter cavity.

[0054] The PLC control assembly is further described as follows.

[0055] As shown in FIG. 6, the PLC control assembly 6 comprises a PLC control board, a power supply board, a temperature measurement board, and the like. The PLC control assembly 6 is installed on the metal support at the front end of the main circuit of the frequency converter. Figure 5As shown, the PLC control assembly 6 comprises a PLC module 601, a relay 602, an isolation module 603, a terminal 604, a relay isolation board 605, etc. The frequency converter is internally provided with a PLC control system, without the need for external explosion-proof PLC devices, greatly reducing the cost investment of the entire system. The PLC control assembly 6 is installed and fixed on the upper front end of the reactor cavity.

[0056] The control system power supply assembly is further described as follows.

[0057] The control system power supply assembly 7 comprises a transformer, a filter, a switching power supply, an energy storage capacitor, etc. The transformer takes power from the input end of the main circuit to provide power input for the entire control system. The filter reduces interference of the control system, and the energy storage capacitor provides short-time power failure buffering for the system. The switching power supply provides driving power for the two-quadrant controllable rectifier explosion-proof frequency converter unit 3.

[0058] The voltage monitoring system is further described as follows.

[0059] The voltage monitoring system 8 is composed of a voltage detection module and is connected to the DC side of the system to detect whether there is residual high voltage in the cavity. It is installed and fixed on the front door plate of the reactor cavity and has a visible window in front.

[0060] In summary, the utility model provides a two-quadrant controllable rectifier explosion-proof frequency converter unit and a multi-application explosion-proof frequency converter, which adopts a two-quadrant topology principle and realizes rectifier control through diode triggering control, can realize four-quadrant function, greatly reduces the investment of power devices, can effectively reduce the overall cost, removes the two-quadrant controllable rectifier control driving board system to further reduce the application cost, is compatible with the system application of the two-quadrant uncontrollable diode topology principle, can be flexibly switched, guarantees the system performance, is suitable for various application environments, integrates an LCR integrated filter and a PLC control system, removes a separate input filter device and a PLC device cabinet, greatly reduces the overall product cost, improves the space utilization rate, and solves the installation and maintenance problems.

[0061] In the specification provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the utility model can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail in order not to obscure the understanding of the specification.

[0062] In addition, those skilled in the art can understand that, although some embodiments described herein include certain features included in other embodiments rather than other features, combinations of features of different embodiments also mean to be within the protection scope of the present application and form different embodiments. For example, in the above embodiments, those skilled in the art can use in a combined manner according to the known technical solutions and the technical problems to be solved by the present application.

[0063] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with the preferred embodiment, it is not intended to limit the present application. Any skilled person in the art can make some changes or modifications within the scope of the technical solutions of the present application by using the above-mentioned technical content, and equivalent embodiments with equivalent changes are equivalent. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present application are still within the scope of the present application.

Claims

1. A two-quadrant controllable rectifier explosion-proof frequency inverter unit, characterized by, It comprises: a water-cooled radiator; a two-quadrant controllable rectifier frequency converter for realizing controllable rectification function, fixed on the water-cooled radiator; a four-quadrant inverter frequency converter for realizing inverter function, fixed on the water-cooled radiator; a frequency converter unit control assembly, fixed on the left and right side supports of the frequency converter main circuit, for realizing control of the entire two-quadrant controllable rectifier explosion-proof frequency converter unit; a plurality of supporting film capacitors, installed on the right side support, for absorbing and buffering bus overvoltage; a DC laminated vulcanization bus, for realizing electrical connection of rectification DC end, inverter DC end and supporting film capacitor; an overvoltage balancing resistor, fixed on the water-cooled radiator and electrically connected to the frequency converter DC end, for absorbing and balancing DC bus voltage.

2. The two-quadrant controllable rectifier explosion-proof frequency converter unit according to claim 1, characterized in that: The two-quadrant controllable rectifier frequency converter comprises three sets of diode modules and three sets of control drive board card systems.

3. The two-quadrant controllable rectifier explosion-proof frequency converter unit according to claim 1, characterized in that: The four-quadrant inverter frequency converter comprises three sets of nine IGBT power modules and supporting drive board card systems.

4. The two-quadrant controllable rectifier explosion-proof frequency converter unit of claim 1, wherein: The frequency converter unit control assembly comprises a master control board, an IO expansion board, a PT100 temperature measurement board and an optical fiber distribution board.

5. A multi-application explosion-proof frequency inverter, characterized by, It comprises: the two-quadrant controllable rectifier explosion-proof frequency converter unit of any one of claims 1 to 4; an input control circuit system, installed in the internal cavity of the frequency converter, comprising an isolation commutating switch, an AC input contactor and a pre-charge control circuit; a rectification input filter system, installed in the internal cavity of the frequency converter, comprising an input filter reactor, a plurality of magnetic rings and a resistance-capacitance filter circuit; a human-machine control interface, installed on the front door panel of the frequency converter, comprising a display screen and an input instruction component; an expanded support capacitor assembly, installed in the internal cavity of the frequency converter, for providing capacitor capacity expansion for the frequency converter; a PLC control assembly, installed in the internal cavity of the frequency converter; a control system power supply assembly, installed in the internal cavity of the frequency converter, for providing power input for the control system; a voltage monitoring system, composed of a voltage detection module, installed on the front door panel of the frequency converter, for detecting whether there is residual voltage in the internal cavity of the frequency converter.

6. The multi-application explosion-proof frequency converter of claim 5, wherein: the isolation commutating switch serves as a power supply control device of the frequency converter, and realizes input control of the frequency converter by turning on and off the isolation commutating switch, and is fixed in a separately designed cavity of the frequency converter by means of bolts; the AC input contactor controls power supply of the main circuit of the two-quadrant controllable rectifier explosion-proof frequency converter unit, realizes fast on-off of the main circuit by signal control, and is fixed and installed in the upper rear area of the reactor cavity; the pre-charge control circuit realizes the pre-charge function of the main circuit, is connected in parallel at the front and rear ends of the AC input contactor, and is fixed and installed on the side of the AC input contactor.

7. The multi-application explosion-proof frequency converter of claim 5, wherein: the input filter reactor and the resistance-capacitance filter circuit realize filtering of the input end of the two-quadrant controllable rectifier frequency converter unit; the input filter reactor is fixed by means of bolts in the rear lower side of the reactor cavity in the internal cavity of the frequency converter; the resistance-capacitance filter circuit is realized in series and parallel with the reactor, the plurality of magnetic rings realize interference shielding of the input end to the frequency converter, and are fixed and installed on the three-phase input cable at the front end of the reactor.

8. The multi-application explosion-proof frequency converter of claim 5, characterized in that: The input instruction component includes intrinsic safety UPS keys, buttons, knobs; the data information in the display screen is inputted and controlled through the intrinsic safety UPS keys, and the remote control, start, stop local control are realized through the buttons and knobs.

9. The multi-application explosion-proof frequency converter of claim 5, characterized in that: The expansion support capacitor component includes a metal mounting plate, a support thin film capacitor, and a DC laminated bus; the thin film capacitor and the DC laminated bus are connected by bolts and fixed on the metal mounting plate.

10. The multi-application explosion-proof frequency converter of claim 5, characterized in that: The PLC control component includes a PLC module, a relay, an isolation module, a terminal, and a relay isolation plate; The control system power supply component includes a transformer, a filter, a switching power supply, and an energy storage capacitor; the transformer takes power from the main loop input end to provide power input for the entire control system; the filter is used for control system interference; the energy storage capacitor provides short-time power failure buffering for the control system; and the switching power supply provides driving power for the two-quadrant controllable rectifier explosion-proof frequency converter unit.

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