Frequency conversion digital compressor

Abstract

The invention relates to a gas compressor and can be applied to the field of air-conditioning refrigeration, chemical industry and places in which gas compression is required. The invention provides a frequency conversion digital compressor which comprises a pulse width modulation (PWM) valve and a motor, and is characterized in that the motor is a frequency conversion motor. Under a low load, the PWM valve is triggered to regulate the output capacity; under a high load, the frequency conversion of the motor is triggered to regulate the output capacity, and a closing valve load is fixed by the PWM valve. The motor is replaced by the frequency conversion motor on the basis that the PWM valve of the digital compressor is adopted, and the PWM valve or the frequency conversion motor can be selected to control the output capacity according to load change, so that following operations can be realized in the compressor: during outputting with low capacity, the loss is lower than that of the traditional digital compressor; the output capacity is lower than that of the traditional frequency conversion compressor even lower than that of the traditional digital compressor, and the digital compressor disclosed by the invention is simple in structure and reliable in performance; during outputting with high capacity, the loss is lower than that of the traditional digital compressor, and the frequency conversion digital compressor has the output capacity higher than that of the traditional digital compressor.

Description

technical field [0001] The invention relates to a gas compressor, which can be applied to fields requiring gas compression, such as air-conditioning and refrigeration, chemical industry and the like. Background technique [0002] In the field of air conditioning and refrigeration, in order to realize the adjustment of compressor capacity output, the original frequency conversion compressor adjusts the output capacity through the frequency conversion of the internal motor. The general output capacity adjustment range of the frequency conversion compressor is 30% to 130%. Later, a digital compressor was invented, which does not use motor frequency conversion, but uses a PWM valve to unload when the valve is opened, and load when the valve is closed. The higher the time ratio is, the larger the output capacity will be, and the output capacity will be 100% if the valve is kept closed. [0003] The advantage of the digital compressor is that due to the use of PWM valve pulse mod...

AI Technical Summary

Problems solved by technology

[0003] The advantage of the digital compressor is that due to the use of PWM valve pulse modulation, the control is simple, and it can achieve a capacity output as low as 10%. 4% to 15% of the rotation speed, but under low load, the idling time takes up a relatively high proportion, resulting in obvious loss

[0004] There is no idling loss in the inverter compressor, but it is difficult to achieve a capacity output of less than 30%. It is necessary to change the pipeline design of the refrigeration and air conditioning pipeline system and release energy through hot gas bypass, which will lead to complex system design and poor reliability. reduce, and cause a waste of energy

[0005] For the realization of output capacity adjustment, either a variable frequency compressor or a digital compressor is used, and the choice of one is sufficient to realize capacity adjustment. Therefore, those skilled in the art have no motivation to use both frequency conversion motors and PWM valves, because this will Suspected of duplication of construction, leading to waste of resources

[0006] Because the inverter compressor and the digital compressor have their own advantages and disadvantages, users generally choose one of them according to their actual situation, and it is difficult to enjoy the advantages of both on one compressor at the same time.

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