A kind of refrigerator method for controlling frequency conversion and application thereofTechnical field
The present invention relates to a kind of refrigerator method for controlling frequency conversion and application thereof, belong to refrigerator control field.
Technical background
Freezer compressor is divided into invariable frequency compressor and frequency-changeable compressor.Invariable frequency compressor product type is abundant, technology maturation, and be widely used, but its frequency is immutable, under certain operating mode, refrigerating capacity is definite value; Frequency-changeable compressor can realize changing its rotating speed and then changing compressor refrigerating capacity, compressor can high-speed cruising at high load conditions, refrigerator can be lowered the temperature by fast-refrigerating, under underload or stable state, compressor can maintain slow-speed of revolution operation, refrigerant system efficiency is high, effective minimizing compressor start-stop frequency, the temperature inside the box is fluctuated little, noise is low.
At present, the mode that frequency-changeable compressor mainly adopts in rotating speed control " drawing shelves ", i.e. environmentally temperature and the temperature inside the box, compressor revolution divides different gear, compressor operating frequency is determined by current residing environment temperature and the temperature inside the box, when refrigerator compartment temperature is higher than this room certain value of starting point temperature, compressor revolution can rise to certain gear accordingly.In fact suitable compressor refrigerating capacity demand is not only relevant to environment temperature, also comprises the load variations of refrigerator own, such as refrigerator open or put into load etc., and therefore this control method is difficult to accomplish to adjust timely and effectively when being changed by casing state.As from the foregoing, existing frequency-changeable compressor FREQUENCY CONTROL technology fails to give full play to the feature of frequency-changeable compressor.
Summary of the invention
For overcoming existing technological deficiency, the object of the present invention is to provide a kind of refrigerator method for controlling frequency conversion and application thereof, the advantage of frequency-changeable compressor variable speed can be given full play to, make refrigerator reach noise reduction, energy-conservation object.
The present invention is that technical solution problem adopts following technical scheme:
The feature of a kind of refrigerator method for controlling frequency conversion of the present invention is carried out as follows:
Step one: setting target Homes Using TV η0, refrigerator powers on first, and compressor runs with maximum speed;
Step 2: when compressor operating is to (N+1) secondary shutdown, the average Homes Using TV η in a N continuous start-stop cycle before through type (1) acquisition refrigeratori:
ηi=compressor accumulated running time/total time (1)
Step 3: through type (2) obtains regulation coefficient Ki:
Ki＝ηi/η0(2)
Step 4: through type (3) obtains the running speed S of compressor when starting shooting next timei:
Si＝Ki×S(i-1)(3)
When compartment temperature arbitrary in refrigerator is higher than the starting point temperature T of room between described1dEG C time, the temperature difference between described compartment temperature and described starting point temperature is Δ T1, then through type (4) upgrades described running speed Si, and run (N+1) individual all after dates, recalculate average Homes Using TV η by formula (1) and formula (2)iwith regulation coefficient Ki, the running speed S of compressor when starting shooting next time to obtaini;
Si＝S(i-1)+K1×ΔT1(4)
In formula (4), K1for constant, span is 0-1500;
If the difference that the temperature in refrigerator set by arbitrary room is lowered between front and back is Δ T2, then through type (5) upgrades described running speed Si, and run (N+1) individual all after dates, recalculate average Homes Using TV η by formula (1) and formula (2)iwith regulation coefficient Ki, the running speed S of compressor when starting shooting next time to obtaini;
Si＝S(i-1)+K2×ΔT2(5)
In formula (5), K2for constant, span is 0-1500;
If compressor continuous operating time is more than or equal to t1 minute, then through type (6) upgrades described running speed Si, and run (N+1) individual all after dates, recalculate average Homes Using TV η by formula (1) and formula (2)iwith regulation coefficient Ki, the running speed S of compressor when starting shooting next time to obtaini;
Si＝S(i-1)+K3(6)
In formula (6), K3for constant, span is 0-2100.
The feature of refrigerator method for controlling frequency conversion of the present invention is also:
The running speed S of described compressoriupgrade after every N number of start-stop cycle, the span of N is 2-10 time.
Described running speed Siif be more than or equal to the compressor maximum speed of regulation, then compressor runs with maximum speed, if running speed Sibe less than or equal to the compressor minimum speed of regulation, then compressor runs with minimum speed.
Described target Homes Using TV η0for the desirable Homes Using TV of refrigerator, span is 40%-100%.
Described regulation coefficient Kiif meet | Ki-1|≤a, then Kithe span of=1, a is 0-0.2.
The starting point temperature T of described room1span be 1-15 DEG C.
The span of described t1 minute is 20-360 minute.
The feature of a kind of refrigerator of the present invention is: described refrigerator adopts above refrigerator method for controlling frequency conversion described in arbitrary feature.
Compared with existing technology, beneficial effect of the present invention is embodied in:
The present invention is by being updated periodically the running speed of compressor; thus the refrigerating capacity of compressor can be adjusted timely and effectively according to the change of refrigerator actual load; load increases compressor frequency and increases; load reduces compressor frequency and reduces; make refrigerator be in ideal state all the time to run; and can effectively reduce compressor on-off energy loss, reduce the temperature inside the box fluctuation, reach the object that noise is low, energy consumption is little.
Accompanying drawing explanation
Fig. 1 is control flow chart of the present invention;
Fig. 2 is frequency-changeable compressor changed power tendency chart of the present invention.
Detailed description of the invention
In the present embodiment, as shown in Figure 1, a kind of refrigerator method for controlling frequency conversion, carries out as follows:
Step one: setting refrigerator target Homes Using TV η0, target Homes Using TV η0for the desirable Homes Using TV of refrigerator, span is 40%-100%; Refrigerator powers on first, and compressor runs with maximum speed;
Step 2: when compressor operating is to (N+1) secondary shutdown, the average Homes Using TV η in a N continuous start-stop cycle before through type (1) acquisition refrigeratori:
ηi=compressor accumulated running time/total time (1)
Step 3: the average Homes Using TV η in a front N continuous start-stop cycleiwith target Homes Using TV η0compare, through type (2) obtains regulation coefficient Ki:
Ki＝ηi/η0(2)
Step 4: through type (3) obtains the running speed S of compressor when starting shooting next timei:
Si＝Ki×S(i-1)(3)
When compartment temperature arbitrary in refrigerator is higher than the starting point temperature T of this room1dEG C time, the temperature difference between compartment temperature and starting point temperature is Δ T1, then through type (4) upgrades running speed Si, and run (N+1) individual all after dates by this rotating speed, recalculate average Homes Using TV η by formula (1) and formula (2)iwith regulation coefficient Ki, the running speed S of compressor when starting shooting next time to obtaini; Otherwise do not upgrade compressor rotary speed;
Si＝S(i-1)+K1×ΔT1(4)
In formula (4), K1for constant, span is 0-1500; Between the starting point temperature T of room1span be 1-15 DEG C.
If the difference that the temperature in refrigerator set by arbitrary room is lowered between front and back is Δ T2, the temperature namely set by certain room was Ta before downward, was Tb after downward, then Δ T2=Ta-Tb, through type (5) upgrades running speed Si, and run (N+1) individual all after dates by this rotating speed, recalculate average Homes Using TV η by formula (1) and formula (2)iwith regulation coefficient Ki, the running speed S of compressor when starting shooting next time to obtaini; Otherwise do not upgrade compressor rotary speed;
Si＝S(i-1)+K2×ΔT2(5)
In formula (5), K2for constant, span is 0-1500;
If compressor continuous operating time is more than or equal to t1 minute, then through type (6) upgrades running speed Si, and run (N+1) individual all after dates by this rotating speed, recalculate average Homes Using TV η by formula (1) and formula (2)iwith regulation coefficient Ki, the running speed S of compressor when starting shooting next time to obtaini; Otherwise do not upgrade compressor rotary speed;
Si＝S(i-1)+K3(6)
In formula (6), K3for constant, span is 0-2100; The span of t1 minute is 20-360 minute.
The running speed S of compressoriupgrade after every N number of start-stop cycle, the span of N is 2-10 time.Regulation coefficient Kiif meet | Ki-1|≤a, then compressor rotary speed can not upgrade, i.e. Kithe span of=1, a is 0-0.2.
Running speed Siif be more than or equal to the compressor maximum speed of regulation, then compressor runs with maximum speed, if running speed Sibe less than or equal to the compressor minimum speed of regulation, then compressor runs with minimum speed.
Adopt a refrigerator for above refrigerator method for controlling frequency conversion, as shown in Figure 2, can reach the object of energy saving in running: refrigerator powers on first, compressor runs with maximum speed, every N number of start-stop cycle, and compressor upgrades rotating speed.As time goes on, casing load reduces, and now compressor rotary speed reduces, refrigerator power reduction, and when compartment temperature trend is stablized, compressor is with the stable operation of the slow-speed of revolution high operation ratio.