CN210323230U - Energy-saving mining frequency converter loading test system - Google Patents

Abstract

The utility model provides an energy-saving mining frequency converter loading test system, which cools the frequency converter through circulating water provided by a heat radiation water tank, and realizes the independent operation of two circulating systems through the arrangement of a left circulating heat radiation system and a right circulating heat radiation system; through control flap, can also just can provide the circulating water for two radiators with only a water pump, guarantee cooling system's normal operating, have that the radiating effect is good, reserve means is many, not fragile advantage, can carry out effectual cooling treatment when converter load test to make the load test result of converter more accurate, increase the life of converter simultaneously. The box body of the operation table is provided with a transparent part corresponding to the explosion-proof display so as to facilitate observation; the box sets up installation guide rail and wiring draw-in groove, and the installation guide rail is the U-shaped to set up electrical components in the U-shaped space, electrical components connecting wire arranges through the wiring hole in the wiring draw-in groove, and the wiring is more neat, avoids the wiring confusion.

Description

Energy-saving mining frequency converter loading test system

Technical Field

The utility model relates to a converter test field, concretely relates to energy-saving mining converter loading test system.

Background

Along with the popularization and application of the mining frequency converter in mine enterprises, the high requirements on the quality of the product are also met, and a loading test before use is developed towards the direction of automatic control, economy and applicability. The prior mine frequency converter loading test has a plurality of defects, such as: when the loading test is carried out, a lot of operators are needed to carry out close-range manual loading debugging, the personal safety of the workers cannot be well guaranteed in the loading process, the damage coefficient of the electrical equipment is high, the error of the experimental data obtained by the loading test is relatively large, the electric energy is consumed a lot and cannot be recovered in the loading test process, and the cost of the loading test is indirectly improved due to the electric energy waste.

Meanwhile, the underground environment of the coal mine is complex and severe, not only is moist and grey, but also contains a lot of dust, the dust and the moisture are easy to cause short circuit of electrical equipment so as to cause failure, the electrical equipment can generate sparks, electric arcs and the like under the failure state, and the sparks and the electric arcs are easy to become ignition sources for igniting mine gas, so that the electrical equipment used under the coal mine must meet the explosion-proof requirement. At present, a mining operation table is used in many underground coal mines, and the mining operation table is matched with a mining control box to realize control and protection of an underground electric control system. However, the existing operation table has a complex structure and a single function, and is very inconvenient to operate.

The utility model discloses a chinese utility model patent that application number is 201220353214.3 discloses a converter load test platform, can solve the extravagant problem of energy to the electric wire netting in the energy repayment of converter output, reduced the testing cost. However, when testing the frequency converter, the temperature of the frequency converter will have a great influence on the precision of the test result, so how to effectively cool the frequency converter in the testing process is an important link.

At present, the heat dissipation mode of domestic mining AC frequency converters is mostly forced air cooling, along with the continuous development of domestic frequency converter technology in recent years, the capacity of frequency converter constantly improves, and forced air cooling heat dissipation is influenced by many aspects of reasons such as radiator area, ambient temperature, frequency converter service environment, fan volume and noise, can not satisfy the heat dissipation requirement of high-power frequency converter completely. In addition, once the heat dissipation device is damaged, heat cannot be dissipated in time, the mining alternating-current frequency converter is easy to damage, and then huge loss is caused.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to prior art's not enough to a provide an energy-saving mining converter loading test system, concrete scheme is as follows:

an energy-saving mining frequency converter loading test system comprises an operation table, a processing unit, a tested frequency converter, a test motor, a loading frequency converter and a first cooling unit for cooling the tested frequency converter; the operation platform is connected with the tested frequency converter and the loading frequency converter through the processing unit

The input end of the frequency converter to be tested is used for connecting a power supply, and the motor end of the frequency converter to be tested is connected with the test motor; the rotating shaft of the test motor is coaxially connected with the rotating shaft of the loading motor; the motor end of the loading frequency converter is connected with the loading motor, and the power end of the loading frequency converter is used for connecting a power grid;

the first cooling unit comprises a heat dissipation water tank, a left circulation heat dissipation system and a right circulation heat dissipation system, wherein a first water outlet, a first water inlet, a second water outlet and a second water inlet are formed in the heat dissipation water tank, the left circulation heat dissipation system comprises the first water outlet, a left water pump, a left radiator, a left condenser and the first water inlet which are sequentially communicated through a pipeline, and the right circulation heat dissipation system comprises the second water outlet, a right water pump, a right radiator, a right condenser and the second water inlet which are sequentially communicated through a pipeline; a first valve is arranged on a pipeline between the first water outlet and the water inlet of the left radiator, a second valve is arranged on a pipeline between the second water outlet and the water inlet of the right radiator, a third valve is arranged on a pipeline between the water outlet of the right radiator and the second water inlet, the water inlet of the left radiator is communicated with the water inlet of the right radiator through a standby pipeline, and a fourth valve is arranged on the standby pipeline;

the operation panel includes the box, the box trailing flank sets up two doors, box and lower box are gone up to inside setting of box, the middle part of going up the box sets up the mounting bracket, install explosion-proof display on the mounting bracket, the leading flank of box corresponds explosion-proof display's display screen sets up the transparency portion, the box sets up a plurality of staggered arrangement's installation guide rail and wiring draw-in groove from top to bottom down, the installation guide rail with the wiring draw-in groove is the U-shaped structure, set up the wiring hole on the both sides wall of wiring draw-in groove respectively, the installation guide rail opening is outside, the wiring draw-in groove opening is inside.

Furthermore, the water outlet of the right radiator is also communicated with a water inlet pipe, and an electric ball valve and a filter are arranged on the water inlet pipe.

Furthermore, a left water meter is arranged on a pipeline between the water outlet of the left radiator and the water inlet of the left condenser, and a right water meter is arranged on a pipeline between the water outlet of the right radiator and the water inlet of the right condenser.

Furthermore, a water outlet is further formed in the heat dissipation water tank, and a drain valve is arranged at the position of the water outlet.

Further, the left radiator and the right radiator are arranged side by side, and radiating copper plates are arranged on the surfaces of the left radiator and the right radiator.

Further, the mounting bracket includes two parallel fixed steel sheets, set up the screw hole on the fixed steel sheet, the explosion-proof display passes through the bolt fastening and is in on the fixed steel sheet.

Furthermore, the lower end of the rear side surface of the box body is provided with a row of wiring terminals; the front side of box outwards forms the boss, the upper surface of boss sets up the fixed frame of control panel, install control panel in the fixed frame of control panel.

Furthermore, display panels are arranged on two sides of the transparent portion, and operation indicating lamps and fault indicating lamps are arranged on the display panels.

Furthermore, two vertical supports are respectively arranged on two sides of the inner portion of the lower box body, the two vertical supports correspond to the installation guide rails and the wiring clamping grooves are provided with transverse supports, the installation guide rails and the wiring clamping grooves are arranged on the transverse supports, and the vertical supports are also provided with the wiring clamping grooves.

Further, a torque sensor is arranged on a rotating shaft between the test motor and the loading motor, and the processing unit is connected with the torque sensor; the structure of the second cooling unit is the same as that of the first cooling unit.

The utility model discloses relative prior art has outstanding substantive characteristics and the progress that is showing, specifically speaking, the utility model has the following advantages:

1. the utility model cools the frequency converter by the circulating water provided by the heat radiation water tank, improves the heat radiation efficiency and capacity, the independent operation of the two circulating systems is realized through the arrangement of the left circulating heat-radiating system and the right circulating heat-radiating system, when one of the left water pump and the right water pump is damaged, a valve on a damaged water pump line is closed, the fourth valve is opened, the water inlet of the left radiator and the water inlet of the right radiator are communicated, thus only one water pump is needed to provide circulating water for the two radiators, the normal operation of the radiating system is ensured, it has the advantages of scientific design, good heat dissipation effect, multiple standby means and difficult damage, can carry out effective cooling treatment during the loading test of the frequency converter, therefore, the loading test result of the frequency converter is more accurate, and the service life of the frequency converter is prolonged;

2. the operating table used in the utility model comprises a box body, the box body is provided with a transparent part corresponding to the explosion-proof display so as to be convenient for observation; the box sets up installation guide rail and wiring draw-in groove, and the installation guide rail is the U-shaped to set up electrical components in the U-shaped space, electrical components connecting wire arranges through the wiring hole in the wiring draw-in groove, and the wiring is more neat, avoids the wiring confusion.

Drawings

FIG. 1 is a schematic structural diagram of a cooling unit of the present invention;

fig. 2 is a schematic structural diagram of a left radiator and a right radiator in the present invention;

FIG. 3 is a schematic structural view of the console of the present invention;

FIG. 4 is a schematic view of the internal structure of the console box of the present invention;

FIG. 5 is a system diagram of the loading test of the intermediate frequency converter of the present invention;

fig. 6 is a loading schematic diagram of the intermediate frequency converter of the present invention;

in the figure: 1. a left heat sink; 2. a right radiator; 3. a left condenser; 4. a right condenser; 5. a left water pump; 6. a right water pump; 7. a water outlet of the left radiator; 8. a water outlet of the right radiator; 9. a left radiator water inlet; 10. a right radiator water inlet; 11. a left water meter; 12. a right water meter; 13. a heat radiation water tank; 14. an electric ball valve; 15. a filter; 16. a first valve; 17. a second valve; 18. a third valve; 19. a fourth valve; 20. a drain valve; 21. a standby pipeline; 22. a box body; 23. a transparent portion; 24. an operation indicator light; 25. a control panel; 26. a boss; 27. a control panel fixing frame; 28. a fault indicator light; 29. an explosion-proof display; 30. installing a guide rail; 31. a wiring card slot; 32. a mining frequency converter loading test system; 33. a power supply and distribution unit; 34. loading a frequency converter unit; 35. a centralized control unit; 36. an upper computer software unit; 37. the frequency converter water-cooling heat dissipation unit; 38. a motor and a bearing workbench unit; 39. a main loop; 40. a control loop; 41.75kw variable frequency loading test bed; 42.75kw variable frequency loading test bed; 43.500kw variable frequency loading test bed; a PLC controller; 45. a switching power supply; 46. a relay; 47. a display; 48. a printer; 49. a heat radiation water tank; 50. a circulation line; 51. a pair-dragging motor; 52. a base; 53. a power grid; 54. a frequency converter to be tested; 55. testing the motor; 56. loading the motor; 57. and loading the frequency converter.

Detailed Description

The technical solution of the present invention will be described in further detail through the following embodiments.

As shown in fig. 1 and 2, the cooling unit in this embodiment includes a heat dissipation water tank 13, a left circulation heat dissipation system and a right circulation heat dissipation system, the heat dissipation water tank 13 is provided with a first water outlet, a first water inlet, a second water outlet and a second water inlet, the left circulation heat dissipation system includes the first water outlet, a left water pump 5, a left radiator 1, a left condenser 3 and the first water inlet which are sequentially communicated through a pipeline, and the right circulation heat dissipation system includes the second water outlet, a right water pump 6, a right radiator 2, a right condenser 4 and the second water inlet which are sequentially communicated through a pipeline; the left circulation heat dissipation system and the right circulation heat dissipation system form two independent circulation heat dissipation systems, wherein the working process of the left circulation heat dissipation system is that the left water pump 5 takes away heat from circulating water in the heat dissipation water tank 13 pumped into the left radiator 1 and then flows back to the heat dissipation water tank 13 after being cooled by the left condenser 3, and the working process of the right circulation heat dissipation system is that the right water pump 6 takes away heat from circulating water in the heat dissipation water tank 13 pumped into the right radiator 2 and then flows back to the heat dissipation water tank 13 after being cooled by the right condenser 4.

In order to avoid delaying the heat dissipation work when a water pump fails, a first valve 16 is arranged on a pipeline between the first water outlet and the left radiator water inlet 9, and the first valve 16 can be arranged between the first water outlet and the left water pump 5 or between the left water pump 5 and the left radiator water inlet 9; a second valve 17 is arranged on a pipeline between the second water outlet and the right radiator water inlet 10, and the second valve 17 can be arranged between the second water outlet and the right water pump 6 or between the right water pump 6 and the right radiator water inlet 10; a third valve 18 is arranged on a pipeline between the right radiator water outlet 8 and the second water inlet, the third valve 18 is used for cutting off or communicating a loop of the right circulation heat dissipation system, the water inlet 9 of the left radiator is communicated with the water inlet 10 of the right radiator through a standby pipeline 21, and a fourth valve 19 is arranged on the standby pipeline 21.

The working principle is as follows: when the left water pump 5 and the right water pump 6 both work normally, the fourth valve 19 is closed, the first valve 16, the second valve 17 and the third valve 18 are opened, and the left circulation heat dissipation system and the right circulation heat dissipation system operate independently; when the left water pump 5 fails, the first valve 16 is closed, the water inlet end of the left circulation cooling system is cut off, the second valve 17, the third valve 18 and the fourth valve 19 are opened, and the right water pump 6 simultaneously provides water circulation power for the left radiator 1 and the right radiator 2; when the right water pump 6 breaks down, the second valve 17 is closed, the water inlet end of the right circulation heat dissipation system is cut off, the first valve 16, the third valve 18 and the fourth valve 19 are opened, and the left water pump 5 simultaneously provides water circulation power for the left radiator 1 and the right radiator 2, so that the normal operation of heat dissipation work under the condition of the failure is realized.

In order to smoothly carry out heat dissipation work when the two water pumps are in failure, the water outlet 8 of the right radiator is also communicated with a water inlet pipe, and the water inlet pipe is provided with an electric ball valve 14 and a filter 15; when the two water pumps are in failure, the first valve 16, the second valve 17 and the third valve 18 are closed, the fourth valve 19 and the electric ball valve 14 are opened, an external water source (mainly a mine water source) enters from the water outlet 8 of the right radiator after being filtered by the filter 15, then flows through the right radiator 2 and the left radiator 1, and flows out from the water outlet 7 of the left radiator, so that the normal operation of heat dissipation is ensured.

In order to facilitate detection, the left circulation heat dissipation system and the water flow direction of the water return end of the right circulation heat dissipation system are arranged, a left water meter 11 is arranged on a pipeline between the water inlet of the left condenser 3 and the water outlet 7 of the left radiator, and a right water meter 12 is arranged on a pipeline between the water inlet of the right condenser 4 and the water outlet 8 of the right radiator.

In order to replace circulating water conveniently, a water outlet is further formed in the heat dissipation water tank 13, and a drain valve 20 is arranged at the water outlet.

In order to further improve the heat dissipation efficiency, the left radiator 1 and the right radiator 2 are arranged side by side, and heat dissipation copper plates are arranged on the surfaces of the left radiator 1 and the right radiator 2; when the heat-radiating copper plate is used, the heat-radiating copper plate is attached to the surface of the frequency converter, the copper material has excellent heat-conducting property, and the heat-absorbing effect is better.

As shown in fig. 3, fig. 4, be the operation panel in this embodiment, including box 22, box 22 trailing flank sets up two divisions of doors, box and lower box are set up to box 22 inside, the middle part of going up the box sets up the mounting bracket, install explosion-proof display 29 on the mounting bracket, box 22's leading flank corresponds explosion-proof display 29's display screen sets up the transparency portion, the box sets up a plurality of staggered arrangement's installation guide rail 30 and wiring draw-in groove 31 from top to bottom down, installation guide rail 30 with wiring draw-in groove 31 is the U-shaped structure, set up the wiring hole on wiring draw-in groove 31's the both sides wall respectively, installation guide rail 30 opening is outside, wiring draw-in groove 31 opening is inside. Preferably, the box body can be integrally formed by stainless steel, so that the operating table is prevented from rusting and corroding due to the fact that the underground production environment of the coal mine is severe and the production conditions are hard.

The mounting bracket comprises two parallel fixed steel plates, threaded holes are formed in the fixed steel plates, and the explosion-proof display 29 is fixed on the fixed steel plates through bolts. The lower extreme of box 22 trailing flank sets up one row of binding post, binding post is for inserting formula binding post, can carry out the pencil connection to the cable of connecting the signal of other equipment, power supply when production operation panel, directly can reduce the technical staff and ensure personal safety at the mine work load at the mine scene to inserting.

The front side of the box body 22 outwards forms a boss 26, the upper surface of the boss is provided with a control panel fixing frame 27, and a control panel 25 is installed in the control panel fixing frame 27. The control panel 25 is provided with a switch and a button.

Display panels are arranged on two sides of the transparent portion, and operation indicating lamps and fault indicating lamps are arranged on the display panels and used for displaying states. The inside both sides of lower box set up vertical support respectively, two vertical supports correspond installation guide rail 30 with wiring draw-in groove 31 sets up horizontal support, the installation guide rail with wiring draw-in groove all set up in on the horizontal support, vertical support also sets up wiring draw-in groove.

In this embodiment, the cooling unit is applied to a mining frequency converter loading test system 32, and as shown in fig. 5 and 6, the system includes six parts, namely a power supply and distribution unit 33, a loading frequency converter unit 34, a centralized control unit 35, an upper computer software unit 36, a frequency converter water-cooling heat dissipation unit 37, and a motor and bearing workbench unit 38. The power supply and distribution unit consists of a power transformer and a power distribution cabinet and comprises a main loop 39 and a control loop 40. The main circuit 39 is mainly a power line layout, provides different levels of voltage for a loading test, and is composed of a circuit breaker, a disconnecting switch, an alternating current contactor, a cable, a copper bar, a sensor and other elements, and the control circuit 40 is connected with a centralized control PLC. The loading frequency converter unit 34 comprises 1 75KW frequency conversion loading test bed 41, 1 75KW frequency conversion loading test bed 42 and 1 500KW frequency conversion loading test bed 43. The centralized control unit 35 is composed of a PLC controller 44, a switching power supply 45, a relay 46, and the like. The upper computer software unit 36, i.e., the console computer, is upper computer control software manufactured by WinCC. The frequency converter water-cooling heat dissipation unit 37 comprises a heat dissipation water tank 49 and a circulation pipeline 50, and cools the frequency converter power elements. The motor and carriage table unit 38 includes a counter-dragging motor 51 and a base 52 for mounting and fixing.

Based on the above, the loading test debugging process is realized by controlling a pair of counter-dragging motors by the loading frequency converter and the tested frequency converter, and is mainly used for realizing the soft start and speed regulation of the motor, and whether the tested frequency converter meets the performance requirement is checked by the loading test. The experiment process is controlled by the PLC centralized control unit 35, and the experimental data and results can be output to the display 47 or the printer 48 through the upper computer software.

Frequency conversion loading test principle: the frequency converter under test 54 and the loading frequency converter 57 respectively drive the test motor 55 and the loading motor 56 which are driven in pairs, the rotors of the test motor 55 and the loading motor 56 are connected through a torque sensor, and the circle between the 55 and the 56 in fig. 6 represents the torque sensor. Firstly, a three-phase alternating current power supply enters a tested frequency converter 54 through a power cable, the tested frequency converter 54 drives a test motor 55 to be smoothly started from a stop state to a rated rotating speed, the test motor 55 runs at full power, and the balance torque is T1; the loading motor 56 reaches the rotation speed operation under the torque T2 by the loading frequency converter 57 giving the loading motor 56 a torque T2(T1 is opposite to T2); since the test motor 55 is in the full power mode of operation and the speed of operation reaches the rated value, the loading motor 56 does not reach the rated speed due to the given torque T2, but since the two asynchronous motors are coaxially connected, the speed of the loading motor 56 continues to increase and the slip becomes negative until the speed opposite to the direction of the test motor 55 and at the same speed is reached, and the loading inverter 57 drives the loading motor 56 to provide an adjustable analog load for the test motor 55, thereby testing the performance of the frequency converter 54 under test. At this point, the loading motor 56 enters four-quadrant operation, and changes to a generating mode, and the generated electric energy is fed back to the grid 53 through the loading frequency converter 57.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.

Claims (10)

1. The utility model provides an energy-saving mining converter loading test system which characterized in that: the device comprises an operation table, a processing unit, a tested frequency converter, a test motor, a loading frequency converter and a first cooling unit for cooling the tested frequency converter; the operation table is connected with the tested frequency converter and the loading frequency converter through the processing unit;

the input end of the frequency converter to be tested is used for connecting a power supply, and the motor end of the frequency converter to be tested is connected with the test motor; the rotating shaft of the test motor is coaxially connected with the rotating shaft of the loading motor; the motor end of the loading frequency converter is connected with the loading motor, and the power end of the loading frequency converter is used for connecting a power grid;

the first cooling unit comprises a heat dissipation water tank, a left circulation heat dissipation system and a right circulation heat dissipation system, wherein a first water outlet, a first water inlet, a second water outlet and a second water inlet are formed in the heat dissipation water tank, the left circulation heat dissipation system comprises the first water outlet, a left water pump, a left radiator, a left condenser and the first water inlet which are sequentially communicated through a pipeline, and the right circulation heat dissipation system comprises the second water outlet, a right water pump, a right radiator, a right condenser and the second water inlet which are sequentially communicated through a pipeline; a first valve is arranged on a pipeline between the first water outlet and the water inlet of the left radiator, a second valve is arranged on a pipeline between the second water outlet and the water inlet of the right radiator, a third valve is arranged on a pipeline between the water outlet of the right radiator and the second water inlet, the water inlet of the left radiator is communicated with the water inlet of the right radiator through a standby pipeline, and a fourth valve is arranged on the standby pipeline;

the operation panel includes the box, the box trailing flank sets up two doors, box and lower box are gone up to inside setting of box, the middle part of going up the box sets up the mounting bracket, install explosion-proof display on the mounting bracket, the leading flank of box corresponds explosion-proof display's display screen sets up the transparency portion, the box sets up a plurality of staggered arrangement's installation guide rail and wiring draw-in groove from top to bottom down, the installation guide rail with the wiring draw-in groove is the U-shaped structure, set up the wiring hole on the both sides wall of wiring draw-in groove respectively, the installation guide rail opening is outside, the wiring draw-in groove opening is inside.

2. The energy-saving mining frequency converter loading test system of claim 1, characterized in that: the delivery port of right side radiator still communicates a inlet tube, be provided with electric ball valve and filter on the inlet tube.

3. The energy-saving mining frequency converter loading test system according to claim 1 or 2, characterized in that: and a left water meter is arranged on a pipeline between the water outlet of the left radiator and the water inlet of the left condenser, and a right water meter is arranged on a pipeline between the water outlet of the right radiator and the water inlet of the right condenser.

4. The energy-saving mining frequency converter loading test system of claim 3, characterized in that: the radiating water tank is also provided with a water outlet, and the water outlet is provided with a drain valve.

5. The energy-saving mining frequency converter loading test system according to any one of claims 1, 2 or 4, characterized in that: the left radiator with the right radiator sets up side by side, the left side radiator with right radiator surface all is provided with the heat dissipation copper.

6. The energy-saving mining frequency converter loading test system of claim 1, characterized in that: the mounting bracket comprises two parallel fixed steel plates, threaded holes are formed in the fixed steel plates, and the explosion-proof display is fixed on the fixed steel plates through bolts.

7. The energy-saving mining frequency converter loading test system of claim 6, characterized in that: the lower end of the rear side surface of the box body is provided with a row of wiring terminals; the front side of box outwards forms the boss, the upper surface of boss sets up the fixed frame of control panel, install control panel in the fixed frame of control panel.

8. The energy-saving mining frequency converter loading test system of claim 7, characterized in that: display panels are arranged on two sides of the transparent portion, and operation indicating lamps and fault indicating lamps are arranged on the display panels.

9. The energy-saving mining frequency converter loading test system of claim 1, characterized in that: the inside both sides of nowel body set up vertical support respectively, two vertical supports correspond the installation guide rail with the wiring draw-in groove sets up horizontal support, the installation guide rail with the wiring draw-in groove all set up in on the horizontal support, vertical support also sets up the wiring draw-in groove.

10. The energy-saving mining frequency converter loading test system of claim 1, characterized in that: a torque sensor is arranged on a rotating shaft between the test motor and the loading motor, and the processing unit is connected with the torque sensor; the structure of the second cooling unit is the same as that of the first cooling unit.

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