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Frequency conversion air compressor indicator of how to test
Author: 志和      Release Date:2014/4/2      View Count:1722
 

The following discussion, is small in the consultation records and air compressor water heater technology master and his gradually find out on the inverter compressortesting indexes in some small way, if inappropriate, please peer critiques.

Refrigeration performance test

Compared with ordinary air compressor single frequency, frequency conversion air compressor working frequency range is very wide, usually 9-28HZ (range, working frequency of compressor by different manufacturers will of course vary).

Frequency conversion air compressor under different frequency, the cooling capacity and the coefficient of performance is different, so in addition to cooling capacity of air compressor rated frequency outside, should also test the air compressor to therefrigeration capacity of each band maximum operating frequency range from theminimum working frequency. And the coefficient of performance of inverter compressor each frequency point can not meet the current national standard,therefore, recommended inverter compressor in addition to the coefficient of performance of the rated frequency to meet the national standard, the coefficient of performance of the rated frequency under a range of frequencies measured also need to meet the current national standard. Of course, the coefficient of performance of the existing national standard requirements can also be modified to improve,especially for the air compressor DC speed regulation system. In addition, the bestshould also establish a minimum performance coefficient, the coefficient of performance of frequency conversion air compressor working frequency measuredmust meet the requirements.

The input power, working current, voltage and frequency

Because the variable frequency air compressor working frequency is different, the working voltage is not the same, so in the measurement of air compressor at different frequency test, should be tested at the same time the input power, working current and voltage (note that this does not include the power input power inverter controller).

Because of the above parameters measurement is to connect related instruments in the inverter to the power line and an air compressor are, but because of its power isoutput by the transducer after chopping, the wide frequency range, and the harmoniccontent, so the test instruments generally are unable to detect the numerical resultscorrect. Therefore, this test instrument in the national standard stipulation, certainly not the more advanced instruments as possible, only effective on it.

Noise and vibration test

Refrigeration performance and test frequency conversion compressor required, in addition to the noise and vibration of rated frequency testing of air compressor of air compressor, also should be tested from the minimum operating frequency to the noise and vibration of the band maximum operating frequency range. And for the noise and vibration frequency conversion compressor each frequency point value should meet the GB standard.

Start performance test

The general inverter compressor startup is a low voltage, low frequency start, air compressor work its operating frequency and rising gradually to the target operating frequency. Because the variable frequency air compressor starting characteristics and common air compressor is not the same. And frequency conversion air compressor must be approved by the variable frequency controller to work.

Therefore, suggest changes in the national standard "9&/ startup performance test" acontent, namely "at the terminal voltage measurement compressor wiring terminal for 8&1; times 61&>9 times rated voltage" this requirement for the "in the end voltage measuring transducer power at the input terminals of 8 &1 times 61&>9 times of the power; when the voltage is" feasible. In addition, with variable frequency controller,inverter compressor working voltage range is generally reached 8; 9? @.91, so thepower supply voltage requirements can be increased to 8&8161&>1 times. At the same time, the manufacturer shall require the rising rate of these two technologiesstart frequency and frequency lists the frequency conversion air compressor.

Starting durability test

Test frequency conversion compressor start the requirements for basic and startingperformance test, is the variable frequency control in low voltage, low frequency ofstart. (the other test conditions and requirements change.) Compressor rotor locked rotor test GB compressor shall be equipped with a suitable motor overcurrent,overheating protection device, such as the ordinary compressor drive single-phase asynchronous motor is equipped with overload protection device. The inverter controller and the control variable frequency compressor work has a built-inovercurrent and overtemperature protection function. So the inverter compressor stalltest should be matched with corresponding frequency controller and the frequency converter, temperature sampling probe on the specified location in the compressor casing. In addition, the manufacturer should provide overcurrent protection action current and overheat protection action temperature.

Accelerated life test

As the working frequency of inverter compressor is changed, cause the compressor to the life in different frequencies are different. Such as low frequency operation mainly consider the problem of compressor lubricant oil, and high frequency operation mainly consider the wear resistance materials for high speed operation. At the same time,frequency conversion air conditioner in the actual operation of the general will run in the low frequency range, high frequency range of working hours are shorter. Inverter air conditioner capable of basic design allows the maximum operating frequency of compressor in the highest frequency of about >1A long running to keep. Therefore,the working frequency of accelerated life test of compressor recommendations were set to test in the minimum allowed the working frequency of the compressor and the maximum allowable working frequency under the condition of >1A, the same test conditions. Two results of accelerated life test of the frequency should also conform to the national standard.

Letter of recommendation:

Chronicles and the electromechanical device limited company to recommend air compressor, water heater, air compressor heat recovery equipment, as long as youhave the air compressor factory, can 0 operation cost of producing hot water andheating. The scope of supply: China (excluding Hong Kong and Macao).

See details > >

(this paper mainly analyzes the inverter compressor indexes, how to test in the actualin the problem solving process is for reference only.)

 
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