阅读说明：本技术 一种节能型变频器老化测试系统 (energy-saving frequency converter aging test system ) 是由 程辉 黄太祥 李新明 马文广 于 2019-12-16 设计创作，主要内容包括：本发明是一种节能型变频器老化测试系统,包括交流母线,交流母线上并联有若干个相互独立的测试系统,所述测试系统包括变频器、负载/发电机构、整流器,所述测试系统还包括直流母线和逆变器,所有整流器的输出端与直流母线并联,所述逆变器的输入端与直流母线连接,逆变器的输出端与交流母线连接,所述负载/发电机构包括一个轴承座,轴承座内装有一根连接轴,连接轴两端对称地装有两个变频电机,其中变频电机A连接变频器,变频电机B连接整流器；本发明回收约50%的电能,实现节能,提高了生产效率,降低了生产成本。(The invention relates to an energy-saving frequency converter aging test system, which comprises an alternating current bus, wherein a plurality of mutually independent test systems are connected in parallel on the alternating current bus, each test system comprises a frequency converter, a load/power generation mechanism and a rectifier, the test system also comprises a direct current bus and an inverter, the output ends of all the rectifiers are connected in parallel with the direct current bus, the input end of the inverter is connected with the direct current bus, the output end of the inverter is connected with the alternating current bus, the load/power generation mechanism comprises bearing seats, connecting shafts are arranged in the bearing seats, two variable frequency motors are symmetrically arranged at two ends of each connecting shaft, a variable frequency motor A is connected with the frequency converter, and a variable frequency motor B is connected with the rectifiers.)

The energy-saving frequency converter aging test system is characterized by comprising a frequency converter, a load/power generation mechanism and a rectifier, wherein the test system further comprises a direct current bus and an inverter, the output ends of all the rectifiers are connected in parallel with the direct current bus, the input end of the inverter is connected with the direct current bus, the output end of the inverter is connected with the alternating current bus, the load/power generation mechanism comprises bearing seats, connecting shafts are arranged in the bearing seats, two variable frequency motors are symmetrically arranged at two ends of each connecting shaft, the variable frequency motor A is connected with the frequency converter, and the variable frequency motor B is connected with the rectifier.

2. The kind of energy-saving frequency converter aging test system of claim 1, further comprising at least data control units, the data control units include a single chip embedded system, the input end of the single chip embedded system is connected to the AC bus, the single chip embedded system has at least output ports, each output port is connected to frequency converters, the single chip embedded system has current, voltage, power real-time monitoring function, frequency converter output overcurrent alarm protection function, aging time timing control of each frequency converter, aging mode selection function.

3. The kind of energy-saving frequency converter aging testing system of claim 2, wherein the testing system further includes an upper computer, the upper computer is connected with each data control unit through a communication cable, and each data control unit collects parameters of the corresponding testing system and transmits the parameters to the upper computer for storage.

4. The kind of energy-saving converter aging testing system of claim 1, wherein the inverter motor includes a stator and a rotor, the rotor is fixedly connected with the connecting shaft, the stator is fixedly installed on both sides of the bearing seat.

5. The kind of energy-saving converter aging testing system of claim 1, wherein the connecting shaft is arranged along the horizontal direction, the inverter motor A is the same as the inverter motor B, and the connecting shaft is installed in the bearing seat through double-row deep groove ball bearings.

6. The kind of energy-saving converter aging testing system of claim 1, wherein the bottom of the bearing seat is provided with a vibration damping foot pad.

7. The kind of energy-saving converter aging testing system of claim 1, wherein the inverter is a photovoltaic inverter, has the function of automatically tracking the frequency and phase of the power grid, and has the function of island protection.

Technical Field

The invention relates to the technical field of frequency converter production, in particular to an energy-saving frequency converter aging test system.

Background

At present, the frequency conversion compressor is mostly adopted for energy conservation of household appliances such as refrigerators and air conditioners and is driven by a matched frequency converter, so the service life and the reliability of the frequency converter directly influence the service life of the refrigerators and the air conditioners, the use stability of the frequency converter is detected by an on-load aging test in the production process of the frequency converter, the responsiveness of the frequency converter can be improved, and the quality of the frequency converter is ensured.

The existing aging load is a simple system composed of a variable frequency compressor, a filter, a refrigerant, a pipeline and a capillary tube, the simple system has short pipeline, fast temperature rise and large condensation and evaporation pressure difference of the system, so that the compressor has overhigh long-term back pressure, unstable operation power and frequent overcurrent protection.

Disclosure of Invention

The invention aims to solve the problems that the existing simple aging system of the compressor frequency converter cannot work for a long time, the energy consumption is high, the service life of the compressor is short, the maintenance is frequent and the like, and provides energy-saving aging test systems of the frequency converter, so that the energy is saved, the production efficiency is improved, and the production cost is reduced.

The specific scheme of the invention is that energy-saving frequency converter aging test systems comprise an alternating current bus, a plurality of mutually independent test systems are connected in parallel on the alternating current bus, each test system comprises a frequency converter, a load/power generation mechanism and a rectifier, the test system further comprises a direct current bus and an inverter, the output ends of all the rectifiers are connected in parallel with the direct current bus, the input end of the inverter is connected with the direct current bus, the output end of the inverter is connected with the alternating current bus, the load/power generation mechanism comprises bearing seats, connecting shafts are arranged in the bearing seats, two variable frequency motors are symmetrically arranged at two ends of each connecting shaft, wherein the variable frequency motor A is connected with the frequency converter, and the variable frequency motor B is connected with the rectifiers.

Preferably, the test system further comprises at least data control units, each data control unit comprises a single-chip embedded system, the input end of the single-chip embedded system is connected with the alternating current bus, the single-chip embedded system is provided with at least output ports, each output port is connected with frequency converters, and the single-chip embedded system has a current, voltage and power real-time monitoring function, a frequency converter output overcurrent alarm protection function, aging time timing control of each frequency converter and an aging mode selection function.

Preferably, the test system further comprises an upper computer, the upper computer is connected with each data control unit through a communication cable, and each data control unit acquires parameters of the corresponding test system and transmits the parameters to the upper computer for storage.

Preferably, the variable frequency motor comprises a stator and a rotor, the rotor is fixedly connected with the connecting shaft, and the stator is fixedly installed on two sides of the bearing seat.

Preferably, the connecting shaft is arranged along the horizontal direction, the variable frequency motor A is the same as the variable frequency motor B, and the connecting shaft is installed in the bearing block through double-row deep groove ball bearings.

Preferably, the bottom of the bearing seat is provided with a vibration reduction foot pad.

Preferably, the inverter is a photovoltaic inverter, has the functions of automatically tracking the frequency and the phase of a power grid, and has an island protection function.

The working principle of the invention is as follows: setting and selecting a continuous start-stop mode, a total aging time and a start-stop interval time through an upper computer or a data control unit, setting fixed value ranges of voltage, current and power of each path, monitoring the voltage, current and power of each path of load in real time, displaying aging operation parameters of each station, and uploading the aging operation parameters to a background data unit of the upper computer through a communication cable; the frequency converter drives a variable frequency motor A as a load, the variable frequency motor A drives a variable frequency motor B as a generator through a connecting shaft, alternating currents generated by all the generators are rectified by a rectifier and then collected to a direct current bus, the direct current collected by the direct current bus is inverted into alternating currents with the same frequency and phase as a power grid through an inverter and transmitted to an alternating current bus (a mains supply end), and automatic recycling of part of electric energy is achieved; the host computer sets up each data control unit parameter in long-range batch, monitors the relevant data and generates the record of each ageing station, and whole ageing process is digital, realizes that the data can be traceed back.

Compared with the prior art, the invention has the advantages that 1, two symmetrical variable frequency motors are arranged to form a load/power generation mechanism through connection of connecting shafts, the traditional simple refrigeration system is replaced, the structure is simpler, the maintenance cost is low, 2, the purpose of energy saving is achieved through self-use of recycled partial electric energy merged into commercial power, the recovery rate can reach about 50%, 3, a data control unit is arranged to monitor all parameters of each paths of aging test systems, the ultralimit alarm shutdown function is realized, the frequency converter and the load/power generation mechanism are protected, 4, the test systems can be expanded infinitely, each paths of test systems are mutually independent, the test scale and the capacity are increased, the test efficiency is improved, 5, an upper computer remotely sets parameters of each data control unit in batches, monitors relevant data of each aging station and generates records, the whole aging process is digitalized, and the data traceability is realized.

Drawings

FIG. 1 is a schematic of the present invention;

FIG. 2 is an exploded view of the load/power generation mechanism of the present invention;

FIG. 3 is a front view of the load/power generation mechanism of the present invention;

in the figure: 1-an upper computer, 2-an alternating current bus, 3-a communication cable, 4-a data control unit, 41-a key control board, 42-a single chip microcomputer embedded system, 43-an output port, 44-an input end, 5-a frequency converter, 6-a load/power generation mechanism, 61-a base, 62-a bearing seat, 63-a double-row deep groove ball bearing, 64-a connecting shaft, 65-a variable frequency motor A, 66-a rotor, 67-a variable frequency motor B, 68-a vibration reduction foot pad, 7-a rectifier, 8-a direct current bus and 9-an inverter.

Detailed Description

Referring to fig. 1-3, this embodiment includes an ac bus 2, two data control units 4 are connected in parallel to the ac bus 2, the data control units 4 include an embedded system 42 and a key control board 41 that employ an STM8S005C6-48P single chip microcomputer, an input end of the single chip microcomputer embedded system 42 is connected to the ac bus, the single chip microcomputer embedded system 42 is provided with 6 output ports 43, each output port 43 is connected to test systems, each test system includes a frequency converter 5 connected to the output port 43, a load/power generation mechanism 6, and a rectifier 7, the single chip microcomputer embedded system 42 has a current, voltage, power real-time monitoring function, an output overcurrent alarm protection function of the frequency converter 5, aging time of each frequency converter 5 is set through the key control board 41, the test system further includes a dc bus 8 and an inverter 9, output ends of all rectifiers 7 are connected in parallel to the dc bus 8, an input end of the inverter 9 is connected to the dc bus 8, an output end of the inverter 9 is connected to the ac bus 2, the load/power generation mechanism 6 includes bases 61, a foot pad 68 is provided at a top of the base 61, a connecting shaft 62 is provided with a connecting shaft 3963, two inverter bearings are symmetrically arranged in a double-row motors connected in the same direction, and two inverter motors 4664 are symmetrically arranged along the same direction.

The test system further comprises an upper computer 1, the upper computer 1 is connected with each data control unit 4 through a communication cable 3, and each data control unit 4 collects parameters of the corresponding test system and transmits the parameters to the upper computer 1 for storage.

In this embodiment, the variable frequency motor includes a stator and a rotor 66, the rotor 66 is fixedly connected to the connecting shaft 64, and the stator is fixedly mounted on two sides of the bearing seat 62.

The inverter 9 is a photovoltaic inverter, has a function of automatically tracking the frequency and the phase of a power grid, and has an island protection function.

The efficiency of 2 series-connected variable frequency motors is lower than 80 percent due to the limitation of the efficiency of the motors, and the loss of other units of the system is added, so that the actual measurement total generating efficiency of the system is between 48 and 57 percent, and the average efficiency is 50 percent.