CN104006504A - Variable frequency air conditioner low-frequency operating control method and control device - Google Patents
Variable frequency air conditioner low-frequency operating control method and control device Download PDFInfo
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- 230000005494 condensation Effects 0.000 claims description 7
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- 230000001174 ascending effect Effects 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000004378 air conditioning Methods 0.000 abstract description 13
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Abstract
The invention discloses a variable frequency air conditioner low-frequency operating control method. The variable frequency air conditioner low-frequency operating control method comprises the steps that a first frequency value, a second frequency value,..., the Nth frequency value are set between a smallest frequency value and a largest frequency value in low-frequency operating from small to large, N is larger than or equal to two, and the Nth frequency value is larger than the smallest frequency value and is smaller than or equal to the largest frequency value; when a compressor operates below the largest frequency value in low-frequency operating, the compressor operates for more than 2 min under the first frequency value, the second frequency value,..., the Nth frequency and the largest frequency value respectively; the frequency of the compressor in the low-frequency operating period is acquired, and when the compressor operates for 30 min to 35 min continuously with the operating frequency of the compressor below the largest frequency value in low-frequency operating, the compressor operates for 2 min to 3 min for oil return with the frequency rising to the oil return frequency, and then the compressor operates with the frequency reduced to the frequency value before frequency rising. An air conditioner can effectively operate under the low frequency for a long time, the air conditioner can operate in an energy-saving mode, meanwhile, rotating speed control over corresponding inner and outer fans is matched, an air conditioning system can operate stably and safely, and meanwhile a stable temperature field is provided for the interior of a room.
Description
Technical field
The present invention relates to a kind of convertible frequency air-conditioner technical field, relate in particular to a kind of convertible frequency air-conditioner low-frequency operation control method and control device.
Background technology
China domestic variable frequency air-conditioning is developed to the DC frequency-changing of current main flow from AC frequency conversion, its cardinal principle is all by regulating compressor operating frequency to realize fast-refrigerating, heat fast.The main feature of domestic variable frequency air-conditioning is as follows now:
Refrigeration mode lower compression machine running frequency is substantially between 25HZ～100HZ;
Indoor fan rotating speed and outdoor compressor running frequency, without contacting directly, are specified by user;
Outdoor fan is synchronizeed with compressor start-stop, i.e. compressor operating fan operation, and compressor stops, and blower fan stops thereupon.
In view of existing convertible frequency air-conditioner has above three features, will cause convertible frequency air-conditioner to have the following disadvantages:
Because air-conditioning minimum operation frequency under air conditioner refrigerating pattern is near 25HZ, caused air-conditioning running refrigerating amount under low frequency state also larger, cause air-conditioning system frequent start-stop;
Even if air-conditioning is when minimum operation frequency running status, consumed power is also relatively high, and meanwhile outdoor fan in normal operating condition, further increased power dissipation;
When air-conditioning compressor is during in low-frequency operation state, if indoor fan moves under high wind speed state, leaving air temp is relatively high, affects user and experiences; And compressor is when low-frequency operation, so easily burn out, prior art cannot guarantee the stable operation of compressor low frequency.
As can be seen here, how existing technology is improved, made the frequency converting air-conditioner compressor can be in the following stable operation of low frequency, this be the important technological problems that this area need to solve.
Summary of the invention
The object of the invention is to, a kind of convertible frequency air-conditioner low-frequency operation control method is provided, make the frequency converting air-conditioner compressor can be at safe and stable operation under lower frequency.Based on this, the present invention also provides a kind of convertible frequency air-conditioner low-frequency operation control device.
For solving above technical problem, technical scheme of the present invention is:
A convertible frequency air-conditioner low-frequency operation control method, comprising:
Ascending first frequency value, the second frequency value of arranging between the minimum frequency value of low-frequency operation and maximum frequency values ... N frequency values, wherein, N is more than or equal to 2, the N frequency values and is greater than minimum frequency value and is less than or equal to maximum frequency values;
When compressor moves below the maximum frequency values of low-frequency operation, in first frequency value, second frequency value ... .. more than moving 2min respectively under N frequency values, maximum frequency values;
Obtain the frequency during compressor low-frequency operation, operation 30min～35min continuously below the maximum frequency values of compressor operating frequency at low-frequency operation, compressor raising frequency carries out oil return to oil return frequency operation 2-3min, is then down to frequency values operation before raising frequency.
Preferably, when compressor is in raising frequency during the stage, when compressor rises to first frequency value from the minimum frequency value of low-frequency operation, under first frequency value, move 2-4min; Continue raising frequency to second frequency value operation 5-8min; Continue the maximum frequency values operation 5min～8min of raising frequency tremendously low frequency operation.
Preferably, when compressor is in raising frequency during the stage, when compressor rises to first frequency value from the minimum frequency value of low-frequency operation, under first frequency value, move 2-4min; Continue raising frequency to second frequency value operation 5-8min; Continue raising frequency to the three frequency values operation 5-8min; Continue the maximum frequency values operation 5min～8min of raising frequency tremendously low frequency operation.
Preferably, when compressor reaches frequency reducing condition, compressor is downconverted to the maximum frequency values of low-frequency operation, under this maximum frequency values, moves 2-4min, continue to be downconverted to second frequency value operation 5min～8min, then continue to be downconverted to first frequency value operation 2-5min.
Preferably, when compressor reaches frequency reducing condition, compressor is downconverted to the maximum frequency values of low-frequency operation, under this maximum frequency values, move 2-4min, continue to be downconverted to the 3rd frequency values operation 5min～8min, continue to be again downconverted to second frequency value operation 5min～8min, then continue to be downconverted to first frequency value operation 2-4min.
Preferably, also comprise: obtain outdoor condensation temperature and compressor operating frequency, according to the difference of outdoor condensation temperature counting chamber condensed exterior temperature and setting value and according to the difference of compressor operating frequency computation part compressor operating frequency and setting value, as difference is all less than or equal to zero, outdoor fan is switched to low wind speed operation.
Preferably, also comprise: obtain compressor exhaust temperature and compressor operating frequency, according to compressor exhaust temperature, calculating the difference of compressor exhaust temperature and setting value, as difference is less than or equal to zero and compressor operating frequency while being less than or equal to 10HZ, is zero by outdoor fan rotational speed regulation.
Preferably, also comprise: obtain compressor operating frequency, when compressor operating frequency is more than or equal to 25HZ, the rotating speed of indoor fan is adjusted to the rotating speed that user sets.
Preferably, also comprise: obtain compressor operating frequency, when compressor operating frequency is less than 25HZ, indoor fan rotating speed is automatically converted to minimum speed.
A kind of convertible frequency air-conditioner low-frequency operation control device of the present invention, comprising:
Setup unit, for ascending first frequency value, the second frequency value of arranging between the minimum frequency value at low-frequency operation and maximum frequency values ... N frequency values, wherein, N is more than or equal to 2, the N frequency values and is greater than minimum frequency value and is less than or equal to maximum frequency values;
Control module, when move, for controlling compressor in first frequency value, second frequency value below the maximum frequency values of compressor at low-frequency operation ... .. more than moving 2min respectively under N frequency values, maximum frequency values;
Monitoring means, for obtaining the frequency during compressor low-frequency operation, and when compressor operating frequency is moved continuously 30min～35min below the maximum frequency values of low-frequency operation, be used for controlling compressor raising frequency and carry out oil return to oil return frequency operation 2-3min, be then down to frequency values operation before raising frequency.
Compared with prior art, method of the present invention is applicable to domestic variable frequency air-conditioner, by regulating compressor operating frequency, when realizing air-conditioner and can grow effectively in low-frequency operation, realize air conditioner energy-saving operation, coordinate corresponding inside and outside rotation speed of fan to control simultaneously, reach that air-conditioning system is stable, safe operation, for indoor, provide stable temperature field simultaneously.
Accompanying drawing explanation
Fig. 1 is the flow chart of convertible frequency air-conditioner low-frequency operation control method embodiment mono-of the present invention;
Fig. 2 is the raising frequency pattern diagram of control method in Fig. 1;
Fig. 3 is the frequency reducing pattern diagram of control method in Fig. 1;
Fig. 4 is the schematic diagram of convertible frequency air-conditioner low-frequency operation control device embodiment of the present invention.
The specific embodiment
For making technical scheme of the present invention clearer, below in conjunction with accompanying drawing, by specific embodiment, come that the present invention is described in detail.
Basic conception of the present invention is: adopt staged raising frequency, frequency reducing pattern, between the minimum frequency value of low-frequency operation and maximum frequency values, be divided into N order frequency, when raising frequency or frequency reducing, under every order frequency value, move a period of time successively, monitor the continuous duration of low-frequency operation simultaneously, surpass scheduled duration and carry out raising frequency oil return, to guarantee air-conditioning safe operation.
Embodiment mono-
Referring to Fig. 1, the convertible frequency air-conditioner low-frequency operation control method of the present embodiment, comprising:
S101, between the minimum frequency value of low-frequency operation and maximum frequency values ascending first frequency value, the second frequency value of arranging ... N frequency values, wherein, N is more than or equal to 2, the N frequency values and is greater than minimum frequency value and is less than or equal to maximum frequency values;
When S102, compressor move below the maximum frequency values of low-frequency operation, at first frequency value, second frequency point ... .. more than moving 2min respectively under N frequency values, maximum frequency values;
S103, obtain the frequency during compressor low-frequency operation, below the maximum frequency values of compressor operating frequency at low-frequency operation, move continuously 30min～35min, compressor raising frequency to oil return frequency is moved 2-3min and is carried out oil return, is then down to the front frequency values operation of raising frequency.
Wherein, the minimum frequency of low-frequency operation can be 0HZ; The peak frequency of low-frequency operation can be 25HZ or other numerical value.
In the present embodiment, N=2, between 0-25HZ, first frequency value is set is 5HZ, second frequency value is set is 15HZ, the minimum frequency of low-frequency operation is that 0HZ, peak frequency are 25HZ.
Referring to Fig. 2, can be lower than the following stable operation of 25HZ for realizing frequency converting air-conditioner compressor, the present embodiment is pressed off-premises station, indoor set detailed description technology control program, specific as follows:
Off-premises station control program:
When compressor is in raising frequency during the stage, when compressor rises to 5HZ from zero hertz, stable operation 2min under 5HZ state; Continue raising frequency to 15HZ stable operation 5min; Continue raising frequency to 25HZ stable operation 5min; Press afterwards normal operation mode operation, the frequency of compressor raising frequency is 1HZ/S during this time, when air-conditioning continuous acquisition is less than or equal to 25HZ to compressor operating frequency, move continuously 30min, compressor frequency rises to 50HZ operation 2min and carries out oil return, is down to afterwards the front Frequency point of raising frequency.
Referring to Fig. 3, indoor environment temperature is when setting the temperature difference and reach compressor and be downconverted to minimum operation frequency, compressor is downconverted to 25HZ operation 2min, continue to be downconverted to 15HZ operation 5min, continue to be downconverted to 5HZ stable operation, when air-conditioning collects compressor operating frequency, be less than or equal to 25HZ and move continuously 30min, compressor raising frequency carries out oil return to 50HZ operation 2min, be down to afterwards the front Frequency point of raising frequency, the frequency of compressor frequency reducing is carried out with 1HZ/S.
Outdoor fan rotating speed is controlled associated with outdoor condensation temperature and compressor exhaust temperature, in the present embodiment, when condensation temperature is less than or equal to certain setting value and compressor operating frequency and is less than or equal to certain setting value, outdoor fan is switched to low velocity wind operation, when compressor exhaust temperature is less than or equal to scheme setting value and compressor operating frequency and is less than or equal to 10HZ, control outdoor fan out of service.
When compressor operating frequency is more than or equal to 25HZ, control room inner blower rotating speed is set rotating speed operation by user, and when compressor operating frequency is less than 25HZ, indoor fan rotating speed is automatically converted to minimum speed.
The frequency conversion wall-hanging cabinet-type air conditioner that the specified refrigerating capacity of take is 3500W is example, and in specified cooling condition lower compression machine running frequency, during at 25HZ, indoor fan moves high wind rotating speed, actual measurement refrigerating capacity is 1500W, consumed power is about 370W, and room thermic load is during lower than 1500W, and air-conditioner is by frequent start-stop.By control model operation of the present invention; compressor minimum operation frequency is 5HZ; indoor fan rotating speed is low wind rotating speed, and outdoor fan is in halted state, and now under specified cooling condition, the about 350W of refrigerating capacity is surveyed in test; consumed power is 90W; room thermic load is higher than 350W, and air-conditioning system does not need to shut down, and according to indoor environment temperature, automatically judges compressor operating frequency; improve indoor environment comfort level, simultaneously energy-conservation 75% left and right.
The convertible frequency air-conditioner low-frequency operation control method of the present embodiment will expand original compressor operating frequency separation, refrigerating capacity scope is further expanded, can automatically adjust compressor operating frequency according to room thermic load, input appropriate refrigerating capacity, reach the effect of equalization stable room temperature, simultaneously because compressor minimum operation frequency is down to below 5HZ from 25HZ, the complete machine consumed power of two Frequency points on year-on-year basis, 30% when 5HZ operation wasted work is about 25HZ operation.Because of outdoor fan, can be down to low or first gear and even stop further reducing power consumption, when compressor operating frequency is less than 25HZ, indoor fan operation minimum speed can reduce air outlet temperature, strengthens user and experiences.
Outdoor fan is judged running speed or is stopped by compressor operating frequency and condensation temperature, realizes outdoor fan power saving or zero power consumption;
Outdoor compressor minimum operation frequency can be down to stable operation 5HZ or lower state from existing 25HZ, realizes system power dissipation and reduces, and reaches energy-conservation object;
When outdoor compressor running frequency is during lower than 25HZ, indoor fan rotating speed is adjusted automatically, and because compressor operating frequency range is wider, its refrigerating capacity scope expands thereupon, control more accurately indoor environment temperature, reduce the start-stop time of compressor, improve comfortableness.
Embodiment bis-
When different from embodiment mono-, in the present embodiment, N=3, between 0-25HZ, first frequency value is set is 5HZ, second frequency value is set is 10HZ, the 3rd frequency values 15HZ is set.
During raising frequency, from 0HZ raising frequency to 5HZ, then stable operation 3min under 5HZ, continues raising frequency to 10HZ, and stable operation 4min under 10HZ, then continues raising frequency to 15HZ, and stable operation 5min under 15HZ continues raising frequency to 25HZ, stable operation 5min;
During frequency reducing, be down to 25HZ stable operation 5Min, then continue to be down to stable operation 5min under 15HZ, continue to be downconverted to 10HZ stable operation 4Min, continue to be down to 5HZ stable operation 3min.
Embodiment tri-
When different from embodiment mono-, in the present embodiment, N=4, between 0-25HZ, first frequency value is set is 5HZ, second frequency value is set is 10HZ, the 3rd frequency values 15HZ to be set, the 4th frequency values is set be 20HZ.
During raising frequency, from 0HZ raising frequency to 5HZ, then stable operation 3min under 5HZ, continues raising frequency to 10HZ, stable operation 4min under 10HZ, then continue raising frequency to 15HZ, stable operation 5min under 15HZ, continues raising frequency to 20HZ, stable operation 4min under 20HZ, continue raising frequency to 25HZ, stable operation 5min;
During frequency reducing, be down to 25HZ stable operation 5Min, continue to be down to 20HZ stable operation 4min, then continue to be down to stable operation 5min under 15HZ, continue to be downconverted to 10HZ stable operation 4Min, continue to be down to 5HZ stable operation 3min.
On the basis of the above, below convertible frequency air-conditioner low-frequency operation control device of the present invention is described:
Referring to Fig. 4, convertible frequency air-conditioner control device of the present invention comprises:
Setup unit 1, for ascending first frequency value, the second frequency value of arranging between the minimum frequency value at low-frequency operation and maximum frequency values ... N frequency values, wherein, N is more than or equal to 2, the N frequency values and is greater than minimum frequency value and is less than or equal to maximum frequency values;
Control module 2, when move, for controlling compressor in first frequency value, second frequency value below the maximum frequency values of compressor at low-frequency operation ... .. more than moving 2min respectively under N frequency values, maximum frequency values;
Monitoring means 3, for obtaining the frequency during compressor low-frequency operation, and when compressor operating frequency is moved continuously 30min～35min below the maximum frequency values of low-frequency operation, be used for controlling compressor raising frequency and carry out oil return to oil return frequency operation 2-3min, be then down to frequency values operation before raising frequency.
Below be only the preferred embodiment of the present invention, it should be pointed out that above-mentioned preferred embodiment should not be considered as limitation of the present invention, protection scope of the present invention should be as the criterion with claim limited range.For those skilled in the art, without departing from the spirit and scope of the present invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a convertible frequency air-conditioner low-frequency operation control method, is characterized in that, comprising:
Ascending first frequency value, the second frequency value of arranging between the minimum frequency value of low-frequency operation and maximum frequency values ... N frequency values, wherein, N is more than or equal to 2, the N frequency values and is greater than minimum frequency value and is less than or equal to maximum frequency values;
When compressor moves below the maximum frequency values of low-frequency operation, in first frequency value, second frequency value ... .. more than moving 2min respectively under N frequency values, maximum frequency values;
Obtain the frequency during compressor low-frequency operation, operation 30min～35min continuously below the maximum frequency values of compressor operating frequency at low-frequency operation, compressor raising frequency carries out oil return to oil return frequency operation 2-3min, is then down to frequency values operation before raising frequency.
2. convertible frequency air-conditioner low-frequency operation control method as claimed in claim 1, is characterized in that, when compressor is in raising frequency during the stage, when compressor rises to first frequency value from the minimum frequency value of low-frequency operation, under first frequency value, moves 2-4min; Continue raising frequency to second frequency value operation 5-8min; Continue the maximum frequency values operation 5min～8min of raising frequency tremendously low frequency operation.
3. convertible frequency air-conditioner low-frequency operation control method as claimed in claim 1, is characterized in that, when compressor is in raising frequency during the stage, when compressor rises to first frequency value from the minimum frequency value of low-frequency operation, under first frequency value, moves 2-4min; Continue raising frequency to second frequency value operation 5-8min; Continue raising frequency to the three frequency values operation 5-8min; Continue the maximum frequency values operation 5min～8min of raising frequency tremendously low frequency operation.
4. convertible frequency air-conditioner low-frequency operation control method as claimed in claim 1, it is characterized in that, when compressor reaches frequency reducing condition, compressor is downconverted to the maximum frequency values of low-frequency operation, under this maximum frequency values, move 2-4min, continue to be downconverted to second frequency value operation 5min～8min, then continue to be downconverted to first frequency value operation 2-5min.
5. convertible frequency air-conditioner low-frequency operation control method as claimed in claim 1, it is characterized in that, when compressor reaches frequency reducing condition, compressor is downconverted to the maximum frequency values of low-frequency operation, under this maximum frequency values, move 2-4min, continue to be downconverted to the 3rd frequency values operation 5min～8min, then continue to be downconverted to second frequency value operation 5min～8min, then continue to be downconverted to first frequency value operation 2-4min.
6. convertible frequency air-conditioner low-frequency operation control method as claimed in claim 1, it is characterized in that, also comprise: obtain outdoor condensation temperature and compressor operating frequency, according to the difference of outdoor condensation temperature counting chamber condensed exterior temperature and setting value and according to the difference of compressor operating frequency computation part compressor operating frequency and setting value, as difference is all less than or equal to zero, outdoor fan is switched to low wind speed operation.
7. the low-frequency operation control method of convertible frequency air-conditioner as claimed in claim 1, it is characterized in that, also comprise: obtain compressor exhaust temperature and compressor operating frequency, according to compressor exhaust temperature, calculate the difference of compressor exhaust temperature and setting value, as difference is less than or equal to zero and compressor operating frequency while being less than or equal to 10HZ, by outdoor fan rotational speed regulation, be zero.
8. convertible frequency air-conditioner low-frequency operation control method as claimed in claim 1, is characterized in that, also comprises:
Obtain compressor operating frequency, when compressor operating frequency is more than or equal to 25HZ, the rotating speed of indoor fan is adjusted to the rotating speed that user sets.
9. convertible frequency air-conditioner low-frequency operation control method as claimed in claim 1, is characterized in that, also comprises:
Obtain compressor operating frequency, when compressor operating frequency is less than 25HZ, indoor fan rotating speed is automatically converted to minimum speed.
10. a convertible frequency air-conditioner low-frequency operation control device, is characterized in that, comprising:
Setup unit, for ascending first frequency value, the second frequency value of arranging between the minimum frequency value at low-frequency operation and maximum frequency values ... N frequency values, wherein, N is more than or equal to 2, the N frequency values and is greater than minimum frequency value and is less than or equal to maximum frequency values;
Control module, when move, for controlling compressor in first frequency value, second frequency value below the maximum frequency values of compressor at low-frequency operation ... .. more than moving 2min respectively under N frequency values, maximum frequency values;
Monitoring means, for obtaining the frequency during compressor low-frequency operation, and when compressor operating frequency is moved continuously 30min～35min below the maximum frequency values of low-frequency operation, be used for controlling compressor raising frequency and carry out oil return to oil return frequency operation 2-3min, be then down to frequency values operation before raising frequency.
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