Summary of the invention
Main purpose of the present invention is to provide a kind of compressor operating controlling method, control system and cooling cycle system, the problem large to the stability influence of air-conditioning system when solving compressor oil return of the prior art.
To achieve these goals, according to an aspect of the present invention, a kind of compressor operating controlling method is provided, after compressor start, the current operation frequency F0 of Real-time Collection compressor, the size of more current operation frequency F0 and the first default operation frequency F1, the current operation frequency F0 that calculates compressor is greater than the lasting overclocking running time T 0 of the first default operation frequency F1, to continue overclocking running time T 0 and the first default running time T 1 compares, be more than or equal to the first default running time T 1 if continue overclocking running time T 0, regulate the current operation frequency F0 of described compressor to drop to and be less than or equal to the first default operation frequency F1, and keep described compressor under the first default operation frequency F1, to move the second default running time T 2 being less than or equal to, be less than the first default running time T 1 if continue overclocking running time T 0, continue current operation frequency F0 and the lasting overclocking running time T 0 of the described compressor of monitoring.
Further, be less than or equal under the first default operation frequency F1 and moving after the second default running time T 2 at the described compressor of maintenance, controlling current operation frequency F0 and lasting overclocking running time T 0 that described compressor returns to normal operating condition and continues to monitor described compressor.
According to another aspect of the present invention, provide a kind of compressor operating control system, this control system comprises: the first collecting unit, for gathering the current operation frequency F0 of compressor; The first comparison judgment unit, presets the magnitude relationship of operation frequency F1 for the current operation frequency F0 and first of compressor relatively; The first computing unit, is greater than the lasting overclocking running time T 0 of the first default operation frequency F1 for calculate the current operation frequency F0 of described compressor according to the judged result of the first comparison judgment unit; The second comparison judgment unit, for judging the magnitude relationship of described lasting overclocking running time T 0 and the described first default running time T 1 according to the comparison of computational results of the first computing unit; The first control unit, for regulating the current operation frequency F0 of described compressor according to the judged result comparison judged result of the second comparison judgment unit; When the lasting overclocking running time T 0 of the second comparison judgment unit judgement is more than or equal to the first default running time T 1, the first control unit regulates the current operation frequency F0 of compressor to drop to be less than or equal to the first default operation frequency F1, controls compressor and under the first default operation frequency F1, moves the second default running time T 2 being less than or equal to.
Further, when the lasting overclocking running time T 0 of the second comparison judgment unit judgement is less than the described first default running time T 1, the first control unit does not regulate the operation frequency of compressor.
Further, the first control unit control control compressor moves after the second default running time T 2 being less than or equal under the first default operation frequency F1, and the first control unit does not regulate the operation frequency of compressor.
According to another aspect of the present invention, provide a kind of cooling cycle system, this cooling cycle system comprises at least one compressor, and this cooling cycle system adopts aforesaid compressor control method control compressor.
Further, this cooling cycle system is multi-connected machine system.
According to another aspect of the present invention, provide a kind of cooling cycle system, this cooling cycle system comprises at least one compressor, and this cooling cycle system comprises aforesaid compressor operating control system.
Further, this cooling cycle system is multi-connected machine system.
According to technological scheme of the present invention, the problem large to air-conditioning system stability influence while the invention solves compressor oil return in prior art, the present invention is by controlling the operation frequency of each compressor and working time of exceeding desirable operation frequency, regulate the oil drain quantity of lubricant oil to reach the object that ensures compressor lubrication, reduce system fluctuation simultaneously, reduce the impact on air-conditioning system stability, reduce oil return number of times, improve lubricating efficiency.
Embodiment
It should be noted that, in the situation that not conflicting, the feature in embodiment and embodiment in the application can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
Fig. 1 is the control flow schematic diagram of the compressor operating controlling method of first embodiment of the invention, in refrigeration system after compressor start, the current operation frequency F0 of Real-time Collection compressor, the size of more current operation frequency F0 and the first default operation frequency F1, and the current operation frequency F0 that calculates compressor is greater than the lasting overclocking running time T 0 of the first default operation frequency F1, to continue overclocking running time T 0 and the first default running time T 1 compares, adjust the operation frequency of compressor according to comparative result.Wherein, the first default operation frequency F1 can ensure that compressor has the desirable operation frequency of enough lubricant oil, and the first default running time T 1 is the limit overclocking working time of the current operation frequency of compressor higher than the first default operation frequency F1.
Be more than or equal to the first default running time T 1 if continue overclocking running time T 0, regulate the current operation frequency F0 of compressor to drop to and be less than or equal to the first default operation frequency F1, and keep compressor under the first default operation frequency F1, to move the second default running time T 2 being less than or equal to; Be less than the first default running time T 1 if continue overclocking running time T 0, continue current operation frequency F0 and the overclocking running time T 0 of monitoring compressor.
Keeping compressor to move after the second default running time T 2 under the first default operation frequency F1, control compressor and return to normal operating condition, and continue current operation frequency F0 and the overclocking running time T 0 of monitoring compressor.The second preset time T 2 is relevant with structure, the model of compressor, the compressor of different structure, model, and this time can be different, but all can determine by limited normal experiment.
Compressor is in the time of operation, and its operation frequency is higher, and the fluid mass flow that compressor is discharged is larger, and oil extraction rate is also just higher, if compressor continues to move under upper frequency, is prone to petrol starvation.So after compressor is with upper frequency operation certain hour, is adjusted under lower frequency and is moved certain hour, to reduce oil extraction rate, increased the lubricant oil reserves in compressor, the oil level of rising compressor inside.
If the oil extraction rate under the current operation frequency of compressor for the oil extraction rate under the desirable operation frequency of L0, compressor for the compressor interior reservoir oil mass under L1, the current operation frequency of compressor under V0, the desirable operation frequency of compressor the compressor interior reservoir oil mass mass flow rate that is institute's discharge fluid under V1, the current operation frequency of continuous operating time T, compressor under the desirable operation frequency F1 of compressor by under Q0, compressor ideal operation frequency the mass flow rate of discharge fluid be Q1.
Compressor is down to after the desirable operation frequency operation t time by current operation frequency, the increasing amount △ V of lubricant in compressor:
△V=（Q0*L0–Q1*L1）t
Now, the oil reserve of compressor is V1:
V1=V0+△V=V0+（Q0*L0–Q1*L1）t
By this controlling method, only need system to control the compressor that needs oil return, adjust its operation frequency, do not need whole system interlock, little to systematic influence, reduce oil return number of times in the operational reliability that ensures compressor simultaneously, reduce the frequently impact on complete machine fluctuation of oil return, improve the travelling comfort of operation of air conditioner.This controlling method is particularly useful for having the cooling cycle system of multiple compressors, multiple indoor sets, as multi-connected machine system etc.
More specifically, one has the multi-connected machine system of 2 5P compressors, the desirable operation frequency of compressor is 75Hz, the continuous working period that is greater than 75HZ when current operation frequency is greater than 120min, the frequency that reduces compressor is moved 300S to 50HZ, after 300S, remove the operation frequency locking to compressor, return to normal operating condition.
The second embodiment of the present invention is a kind of compressor operating control system, and this control system comprises: collecting unit, the first comparison judgment unit, computing unit, the second comparison judgment unit and control unit.Collecting unit is for gathering the current operation frequency of compressor; The first comparison judgment unit is for relatively judging the magnitude relationship of the current operation frequency of compressor and desirable operation frequency; Computing unit is greater than the lasting overclocking working time of desirable operation frequency for the current operation frequency of calculating compressor; The second comparison judgment unit is for magnitude relationship that relatively judgement continues overclocking working time and overclocking limit working time; Control unit is for regulating the current operation frequency of compressor according to the comparison judged result of comparison judgment unit, in the time that lasting overclocking is more than or equal to the overclocking limit working time working time, current operation frequency is down to desirable operation frequency operation by control unit control compressor, and keep certain hour, to increase the oil reserve in compressor, keep after certain hour, remove the locking to compressor operating frequency, compressor returns to normal operating condition, be less than the overclocking limit working time working time if continue overclocking, keep the current running state of compressor constant.
The third embodiment of the present invention is a kind of cooling cycle system, and this cooling cycle system comprises at least one compressor, and this cooling cycle system adopts the operation of aforesaid its compressor of compressor operating controlling method control.This cold circulatory system is multi-connected machine system.
The fourth embodiment of the present invention is a kind of cooling cycle system, and this cooling cycle system comprises at least one compressor, and this cooling cycle system comprises aforesaid compressor operating controlling method.This cold circulatory system is multi-connected machine system.
According to technological scheme of the present invention, the problem large to air-conditioning system stability influence while the invention solves compressor oil return in prior art, the present invention is by controlling the operation frequency of each compressor and working time of exceeding desirable operation frequency, regulate the oil drain quantity of lubricant oil to reach the object that ensures compressor lubrication, due to all indoor sets and the compressor that do not need in open system, can reduce system fluctuation, reduce the impact on air-conditioning system stability, reduce oil return number of times, improve lubricating efficiency, reduce the impact on travelling comfort, reduced energy consumption.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.