CN105627496A - Low-temperature refrigerating control method of air conditioner and air conditioner - Google Patents
Low-temperature refrigerating control method of air conditioner and air conditioner Download PDFInfo
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- CN105627496A CN105627496A CN201410590648.9A CN201410590648A CN105627496A CN 105627496 A CN105627496 A CN 105627496A CN 201410590648 A CN201410590648 A CN 201410590648A CN 105627496 A CN105627496 A CN 105627496A
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Abstract
The invention provides a low-temperature refrigerating control method of an air conditioner and the air conditioner. By the adoption of the low-temperature refrigerating control method of the air conditioner and the air conditioner, the technical problem that an air conditioner cannot conduct refrigeration continuously under a low-temperature condition is solved. The control method comprises the following steps that when the air conditioner conducts refrigeration, the outdoor environment temperature is detected; whether the detected outdoor environment temperature is lower than a set temperature threshold value or not is judged; and if so, the operation frequency of a compressor of the air conditioner is lowered to be within a preset frequency range, and the superheat degree of the air conditioner is increased by preset degrees. According to the air conditioner adopting the control method, the effect that an indoor heat exchanger cannot enter a freeze protection mode at the low temperature is guaranteed, the indoor heat exchange capacity is improved, and then the refrigerating capacity is improved; in addition, continuous operation of the compressor is achieved, and the technical effect of continuous refrigeration is achieved at the low temperature.
Description
Technical field
The present invention relates to air-conditioning technical field, be specifically related to a kind of air-conditioner cryogenic refrigeration control method and air-conditioner.
Background technology
In the control method that air-conditioner is traditional, good refrigerating capacity can be played when outdoor temperature is higher than predetermined temperature, but when outdoor temperature is lower than predetermined temperature, if air-conditioner conventionally continues to freeze, compressor can flow into liquid refrigerant and cause compressor impaired, and make indoor heat converter freeze.
In order to reach the effect can freezed at low ambient temperatures; in existing air-conditioner; generally adopting the means reducing outdoor fan rotating speed to reduce the heat exchange of outdoor, what make air-conditioner does not have the phenomenon occurring freeze protection because providing cold to cause indoor heat converter to evaporate completely too much.
But above-mentioned means can only realize air-conditioning to existAbove low temperature environment continues to freeze, when temperature reduces further, in order to prevent indoor heat converter frozen, it is desired nonetheless to stop compressor. Visible, above-mentioned means still cannot realize the uninterrupted operation of compressor, it is impossible to realizes air-conditioner continuous cooling under low temperature state.
Summary of the invention
The present invention provides a kind of air-conditioner cryogenic refrigeration control method and air-conditioner, with solve air-conditioner in prior art cannot the technical problem of continuous cooling under low temperature state.
For reaching above-mentioned technical purpose, the present invention realizes by the following technical solutions:
Propose a kind of air-conditioner cryogenic refrigeration control method, said method comprising the steps of: during air-conditioner refrigerating operaton, detect outdoor environment temperature; Judge that whether the outdoor environment temperature of detection is lower than design temperature threshold value; If so, reduce the compressor operating frequency of air-conditioner within the scope of predeterminated frequency, and the degree of superheat of air-conditioner is improved preset degree; Wherein, described design temperature threshold value is room environmental temperature during air-conditioner entrance cryogenic refrigeration.
Further, when judging the outdoor environment temperature detected lower than design temperature threshold value, along with the reduction of described outdoor environment temperature, improve indoor fan rotating speed and/or gradually reduce outdoor fan rotating speed, so that described compressor forms normally compressed ratio.
Further, when the outdoor environment temperature of detection is lower than design temperature threshold value, the compressor operating frequency of described reduction air-conditioner is within the scope of predeterminated frequency, and the degree of superheat of air-conditioner is improved preset degree, particularly as follows: judge that whether described outdoor environment temperature is lower than the first temperature threshold and higher than the second temperature threshold; If so, entered for the first cryogenic refrigeration stage: reduce cooler compressor running frequency to first frequency section, and the degree of superheat of described air-conditioner is improved the first setting degree; If it is not, continue to judge that whether described outdoor environment temperature is lower than the second temperature threshold; If so, entered for the second cryogenic refrigeration stage: reduce cooler compressor frequency to second frequency section, and the air-conditioner degree of superheat is improved the second setting degree.
Further, cooler compressor running frequency is reduced according to the inner coil pipe temperature of described air-conditioner and outer coil temperature.
Further, cooler compressor frequency is reduced according to the inner coil pipe temperature of described air-conditioner and outer coil temperature, particularly as follows: when described inner coil pipe temperature is less than the first temperature, described compressor is with first frequency frequency reducing at a slow speed; When described inner coil pipe temperature is less than the second temperature, described compressor is with the quick frequency reducing of second frequency; When described outer coil temperature is less than three temperature, described compressor is with the 3rd frequency frequency reducing at a slow speed; When described outer coil temperature is less than four temperature, described compressor is with the 4th quick frequency reducing of frequency.
Further, described first frequency section is 30-45HZ, described first set degree as; Described second frequency section is 25-40HZ, described second set degree as��
Further, described first temperature is, described second temperature is, described 3rd temperature is, described 4th temperature is; Described first frequency and described 3rd frequency are 1HZ/10S, and described second frequency and described 4th frequency are 2HZ/10S.
Propose a kind of air-conditioner, including compressor, also include: for detecting the outdoor temperature sensor of outdoor environment temperature; Controller, for receiving and judge the outdoor environment temperature that described outdoor temperature sensor detects, if the outdoor environment temperature of detection is lower than design temperature threshold value, reduces the compressor operating frequency of air-conditioner within the scope of predeterminated frequency, and the degree of superheat of air-conditioner is improved preset degree; Wherein, described design temperature threshold value is room environmental temperature during air-conditioner entrance cryogenic refrigeration.
Further, described air-conditioner also comprises memorizer, is used for storing the first temperature threshold, the second temperature threshold, first frequency section and the first setting degree, and second frequency section and the second setting degree; Described controller specifically for: judge that described outdoor environment temperature is whether lower than described first temperature threshold and higher than described second temperature threshold; If so, control air-conditioner and entered for the first cryogenic refrigeration stage: reduce cooler compressor running frequency to first frequency section, and the degree of superheat of described air-conditioner is improved the first setting degree; If it is not, continue to judge that whether described outdoor environment temperature is lower than described second temperature threshold; If so, entered for the second cryogenic refrigeration stage: reduce cooler compressor frequency to second frequency section, and the air-conditioner degree of superheat is improved the second setting degree.
Further, described air-conditioner also includes off-premises extension and indoor fan, described controller is additionally operable to: when judging the outdoor environment temperature detected lower than design temperature threshold value, reduction along with described outdoor environment temperature, step up indoor fan rotating speed and/or gradually reduce outdoor fan rotating speed, so that described compressor forms normally compressed ratio.
Air-conditioner cryogenic refrigeration control method provided by the invention and air-conditioner; after outdoor environment temperature reduces further; the means reducing cooler compressor frequency reduce the heat exchange of outdoor; reduce the coolant quantity entering vaporizer; indoor evaporator can fully be evaporated; from interrupting refrigeration without entering anti-freeze guard mode, and then improve refrigerating capacity, can realizeRefrigeration, simultaneously, adopt the means increasing the air-conditioner degree of superheat, it is ensured that air-conditioner condensation and the pressure differential of evaporation, make the coolant returning to compressor be in gaseous state, liquid hit phenomenon will not be produced, be damaged from compressor, from without stop compressor operating, and then improve air-conditioner refrigeration performance, realize cooler compressor to run without interruption, realize continuous cooling at low temperatures.
After reading in conjunction with the accompanying the specific embodiment of the present invention, the other features and advantages of the invention will become clearer from.
Accompanying drawing explanation
Fig. 1 is the flow chart of the air-conditioner cryogenic refrigeration control method that the present invention proposes;
Fig. 2 is the flow chart of a specific embodiment of the air-conditioner cryogenic refrigeration control method that the present invention proposes;
The air-conditioner another flow chart of cryogenic refrigeration control method that Fig. 3 present invention proposes;
Fig. 4 is the structural representation of the air-conditioner that the present invention proposes.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described.
In describing the invention, it should be noted that, orientation or the position relationship of the instruction such as term "front", "rear" are based on position relationship shown in the drawings, it is for only for ease of the description present invention and simplifies description, rather than instruction or hint indication device or element must have specific orientation, with specific azimuth configuration and operation, be therefore not considered as limiting the invention.
As it is shown in figure 1, the flow chart of the air-conditioner cryogenic refrigeration control method proposed for the present invention, said method comprising the steps of:
Step S01: during air-conditioner refrigerating operaton, detects outdoor environment temperature;
Step S02: judge that whether the outdoor environment temperature of detection is lower than design temperature threshold value; If so,
Step S03: reduce the compressor operating frequency of air-conditioner within the scope of predeterminated frequency, and by air-conditioning
The degree of superheat of device improves preset degree; Wherein, design temperature threshold value is room environmental temperature during air-conditioner entrance cryogenic refrigeration.
In the air-conditioner cryogenic refrigeration control method that the present invention proposes, outdoor mounted temperature sensor at air-conditioner running space, for detecting outdoor environment temperature, when outdoor environment temperature is not less than design temperature threshold value, such as 12 DEG C time, the properly functioning refrigeration of air-conditioner, after temperature sensor detects that outdoor environment temperature is reduced below design temperature threshold value further, the controller of air-conditioner receives the outdoor environment temperature value that temperature sensor sends back, through judging that it is lower than the temperature range of normal refrigeration, then start cryogenic refrigeration program, the means adopting the compressor frequency reducing air-conditioner reduce the heat exchange of outdoor, reduce the coolant quantity entering indoor evaporator, make coolant evaporation in indoor evaporator abundant, make air-conditioner vaporizer in process of refrigerastion will not enter anti-freeze guard mode and interrupt refrigeration, thus keeping the seriality of process of refrigerastion, and then improve refrigerating capacity, can realizeRefrigeration; Simultaneously, adopt the means increasing the air-conditioner degree of superheat, ensure that the pressure differential of air-conditioner condensation and evaporation, make the coolant returning to compressor be in gaseous state, liquid hit phenomenon will not be produced, be damaged from compressor, from without stopping compressor operating, and then improving the refrigeration performance of air-conditioner, it is achieved cooler compressor runs without interruption, and realizes continuous cooling at low temperatures.
The running refrigerating when low-temp. low-voltage contracting unit frequency is told somebody what one's real intentions are, the circulating load of coolant is less, for setting up the height pressure reduction meeting air-conditioner normal operation, improve the degree of superheat of air-conditioner, its technique effect also resides in: the suitable raising air-conditioner degree of superheat can improve the refrigeration performance of air-conditioner, enables air-conditioner continuous cooling; And make the coolant returning to compressor be in gaseous state, do not produce liquid hit phenomenon, it is to avoid liquid hit phenomenon damages compressor; The height pressure reduction of air-conditioner can also be improved, make pressure at expulsion increase, back pressure rises and compressor bottom temp raises, meet the requirement of compressor bottom temp and condenser middle portion temperature difference, coolant will not be made to gather bottom compressor, compressor lubricant oil will not be made to reduce, thus without influence on the normal lubrication of compressor, and, certain pressure reduction can make the lubricating oil that compressor is discharged return to compressor, further ensures the lubrication of compressor. Above-mentioned visible, the degree of superheat properly increasing air-conditioner both can meet the performance requirement of air-conditioner, it is also ensured that compressor properly functioning, thus improving the service life of compressor.
Preferably, when judging the outdoor environment temperature detected lower than design temperature threshold value, along with outdoor environment
The reduction of temperature, it is possible to improve indoor fan rotating speed and/or gradually reduce outdoor fan rotating speed, so that compressor forms normally compressed ratio. Further, improve the rotating speed of indoor fan, the evaporation of liquid refrigerants can be accelerated, improve indoor heat transfer effect on the one hand, on the other hand, can guarantee that indoor evaporator will not exclusively cause frosting freezeout due to refrigerant evaporation; And reduce outdoor fan rotating speed and can reduce outdoor heat exchange effect, reduce the liquid refrigerants entering vaporizer, be further ensured that coolant evaporation in vaporizer is complete, frosting freezeout will not be produced.
Concrete, the air-conditioner cryogenic refrigeration control method that the present invention proposes is the step shown in Fig. 2:
Step S21: judge that whether outdoor environment temperature is lower than the first temperature threshold and higher than the second temperature threshold; If so,
Step S22: entered for the first cryogenic refrigeration stage: reduce cooler compressor running frequency to first frequency section, and the degree of superheat of air-conditioner is improved the first setting degree; If it is not,
Step S23: continue to judge that whether outdoor environment temperature is lower than the second temperature threshold; If so,
Step S24: entered for the second cryogenic refrigeration stage: reduce cooler compressor frequency to second frequency section, and the air-conditioner degree of superheat is improved the second setting degree.
Above-mentioned, the first temperature threshold, the second temperature threshold, first frequency section and the first setting degree, and the second indoor fan rotating speed, second frequency section and the second setting degree, it is stored in air-conditioner in the memorizer of setting. And first temperature threshold higher than the second temperature threshold.
Certainly, preferred means described above, can take to increase air conditioner chamber's inner blower rotating speed to the first indoor fan rotating speed in the first cryogenic refrigeration stage simultaneously, and/or reduce the outdoor fan rotating speed hands section to the first outdoor fan rotating speed; In the second cryogenic refrigeration stage, it is possible to take to increase air conditioner chamber's inner blower rotating speed to the second indoor fan rotating speed, and/or reduce the outdoor fan rotating speed hands section to the second outdoor fan rotating speed simultaneously; Second indoor fan rotating speed is higher than the first indoor fan rotating speed, and the second outdoor fan rotating speed is lower than the first outdoor fan rotating speed. Then the first indoor fan tachometer value, the first outdoor fan tachometer value, the second indoor fan tachometer value and the second outdoor fan tachometer value are also stored in memorizer.
Wherein, in a preferred embodiment, the first temperature threshold is, the second temperature threshold is, the first indoor fan rotating speed is 100r/min, and the first outdoor fan rotating speed is 200r/min, and first frequency section is 30-45HZ, first set degree as; Second indoor fan rotating speed is 200r/min, and the second outdoor fan rotating speed is 150r/min, and second frequency section is 25-40HZ, second set degree as��
After air-conditioner entered for the second cryogenic refrigeration stage, as it is shown on figure 3, the air-conditioner cryogenic refrigeration control method that the present invention proposes can also comprise the following steps:
Step S31: whether detection outdoor environment temperature is higher than the second temperature threshold and lower than the first temperature threshold; If so,
Step S32: control air-conditioner and run to the first cryogenic refrigeration stage; If it is not,
Step S33: whether detection outdoor environment temperature is higher than the first temperature threshold; If;
Step S34: control air-conditioner and run to normal refrigerating state.
Pass through above-mentioned steps, it is achieved air-conditioner regulates the effect of refrigerating state in real time according to outdoor environment temperature.
In said method, reducing the compressor frequency of air-conditioner, be based on the inner coil pipe temperature of air-conditioner and outer coil temperature comes fixed, when inner coil pipe temperature is less than the first temperature, compressor is with first frequency frequency reducing at a slow speed; When inner coil pipe temperature is less than the second temperature, compressor is with the quick frequency reducing of second frequency; When outer coil temperature is less than three temperature, compressor is with the 3rd frequency frequency reducing at a slow speed; When outer coil temperature is less than four temperature, compressor is with the 4th quick frequency reducing of frequency.
Concrete, the embodiment that the present invention proposes is: when inner coil pipe temperature lower thanTime, carry out frequency reducing at a slow speed with the speed of 1H/10S, when inner coil pipe temperature lower thanTime, carry out quick frequency reducing with the speed of 2HZ/10S, until being down to the low-limit frequency of frequency band; On the contrary, after outdoor environment temperature raises, when inner coil pipe temperature is higher thanTime, carry out quick raising frequency with the speed of 2HZ/10S, when inner coil pipe temperature is higher thanTime, carry out raising frequency at a slow speed with the speed of 1HZ/10S, until rising to the highest frequency of frequency band. When outer coil temperature lower thanTime, carry out frequency reducing at a slow speed with the speed of 1HZ/10S, when outer coil pipe temperature lower thanTime, carry out quick frequency reducing with the speed of 2HZ/10S, until being down to the low-limit frequency of frequency band; On the contrary, after outdoor environment temperature raises, when outer coil temperature is higher thanTime, carry out quick raising frequency with the speed of 2HZ/10S, when outer coil temperature is higher thanTime, carry out raising frequency at a slow speed with the speed of 1HZ/10S, until rising to the highest frequency of frequency band.
As shown in Figure 4, the present invention also proposes a kind of air-conditioner using above-mentioned cryogenic refrigeration control method, including compressor 3, outdoor temperature sensor 4 and controller 5; Outdoor temperature sensor is used for detecting outdoor environment temperature; Controller is for receiving and judge the outdoor environment temperature that described outdoor temperature sensor detects, if the outdoor environment temperature of detection is lower than design temperature threshold value, reduce the compressor operating frequency of air-conditioner within the scope of predeterminated frequency, and the degree of superheat of air-conditioner is improved preset degree; Wherein, design temperature threshold value is room environmental temperature during air-conditioner entrance cryogenic refrigeration.
Air-conditioner also comprises memorizer 6, is used for storing the first temperature threshold, the second temperature threshold, first frequency section and the first setting degree, and second frequency section and the second setting degree; Then controller specifically for: judge that outdoor environment temperature is whether lower than the first temperature threshold and higher than the second temperature threshold; If so, control air-conditioner and entered for the first cryogenic refrigeration stage: reduce cooler compressor running frequency to first frequency section, and the degree of superheat of air-conditioner is improved the first setting degree; If it is not, continue to judge that whether outdoor environment temperature is lower than the second temperature threshold; If so, entered for the second cryogenic refrigeration stage: reduce cooler compressor frequency to second frequency section, and the air-conditioner degree of superheat is improved the second setting degree.
Air-conditioner also includes outdoor fan 1 and indoor fan 2, then controller is additionally operable to: when judging the outdoor environment temperature detected lower than design temperature threshold value, reduction along with described outdoor environment temperature, improve indoor fan rotating speed and/or gradually reduce outdoor fan rotating speed, so that described compressor forms normally compressed ratio.
Accordingly, memorizer 6 is additionally operable to improve in the first cryogenic refrigeration stage of storage the first indoor fan tachometer value of indoor fan, and reduces the first outdoor fan tachometer value of outdoor fan; And the second indoor fan tachometer value improving indoor fan in the second cryogenic refrigeration stage of storage, and reduce the second outdoor fan tachometer value of outdoor fan.
Air-conditioner proposed by the invention is the air-conditioner using above-mentioned cryogenic refrigeration control method, and the control method being embodied as cryogenic refrigeration describes in detail, and it will not go into details herein.
The air-conditioner cryogenic refrigeration control method proposed by the present invention and air-conditioner, after outdoor environment temperature reduces further, adopted the means reducing cooler compressor frequency to reduce the heat exchange of outdoor, improve refrigerating capacity, can realizeRefrigeration, simultaneously, adopt the means increasing the air-conditioner degree of superheat, it is ensured that air-conditioner condensation and the pressure differential of evaporation, make the coolant returning to compressor be in gaseous state, liquid hit phenomenon will not be produced, be damaged from compressor, from without stop compressor operating, and then improve air-conditioner refrigeration performance, realize cooler compressor to run without interruption, realize continuous cooling at low temperatures.
The above, be only presently preferred embodiments of the present invention, is not the restriction that the present invention makees other form, and any those skilled in the art are changed or be modified as the Equivalent embodiments of equivalent variations possibly also with the technology contents of the disclosure above. But every without departing from technical solution of the present invention content, according to any simple modification, equivalent variations and remodeling that above example is made by the technical spirit of the present invention, still fall within the protection domain of technical solution of the present invention.
Claims (10)
1. air-conditioner cryogenic refrigeration control method, it is characterised in that said method comprising the steps of:
During air-conditioner refrigerating operaton, detect outdoor environment temperature;
Judge that whether the outdoor environment temperature of detection is lower than design temperature threshold value;
If so, reduce the compressor operating frequency of air-conditioner within the scope of predeterminated frequency, and the degree of superheat of air-conditioner is improved preset degree; Wherein, described design temperature threshold value is room environmental temperature during air-conditioner entrance cryogenic refrigeration.
2. air-conditioner cryogenic refrigeration control method according to claim 1, it is characterized in that, when judging the outdoor environment temperature detected lower than design temperature threshold value, reduction along with described outdoor environment temperature, improve indoor fan rotating speed and/or gradually reduce outdoor fan rotating speed, so that described compressor forms normally compressed ratio.
3. air-conditioner cryogenic refrigeration control method according to claim 1, it is characterized in that, when the outdoor environment temperature of detection is lower than design temperature threshold value, the compressor operating frequency of described reduction air-conditioner is within the scope of predeterminated frequency, and the degree of superheat of air-conditioner is improved preset degree, particularly as follows:
Judge that whether described outdoor environment temperature is lower than the first temperature threshold and higher than the second temperature threshold;
If so, entered for the first cryogenic refrigeration stage: reduce cooler compressor running frequency to first frequency section, and the degree of superheat of described air-conditioner is improved the first setting degree;
If it is not, continue to judge that whether described outdoor environment temperature is lower than the second temperature threshold;
If so, entered for the second cryogenic refrigeration stage: reduce cooler compressor frequency to second frequency section, and the air-conditioner degree of superheat is improved the second setting degree.
4. air-conditioner cryogenic refrigeration control method according to claim 1, it is characterised in that reduce cooler compressor running frequency according to the inner coil pipe temperature of described air-conditioner and outer coil temperature.
5. air-conditioner cryogenic refrigeration control method according to claim 4, it is characterised in that reduce cooler compressor frequency according to the inner coil pipe temperature of described air-conditioner and outer coil temperature, particularly as follows:
When described inner coil pipe temperature is less than the first temperature, described compressor is with first frequency frequency reducing at a slow speed;
When described inner coil pipe temperature is less than the second temperature, described compressor is with the quick frequency reducing of second frequency;
When described outer coil temperature is less than three temperature, described compressor is with the 3rd frequency frequency reducing at a slow speed;
When described outer coil temperature is less than four temperature, described compressor is with the 4th quick frequency reducing of frequency.
6. air-conditioner cryogenic refrigeration control method according to claim 3, it is characterised in that described first frequency section is 30-45HZ, described first sets degree as 1 DEG C; Described second frequency section is 25-40HZ, described second set degree as��
7. air-conditioner cryogenic refrigeration control method according to claim 5, it is characterised in that described first temperature is, described second temperature is, described 3rd temperature is, described 4th temperature is; Described first frequency and described 3rd frequency are 1HZ/10S, and described second frequency and described 4th frequency are 2HZ/10S.
8. an air-conditioner, including compressor, it is characterised in that also include:
For detecting the outdoor temperature sensor of outdoor environment temperature;
Controller, for receiving and judge the outdoor environment temperature that described outdoor temperature sensor detects, if the outdoor environment temperature of detection is lower than design temperature threshold value, reduces the compressor operating frequency of air-conditioner within the scope of predeterminated frequency, and the degree of superheat of air-conditioner is improved preset degree; Wherein, described design temperature threshold value is room environmental temperature during air-conditioner entrance cryogenic refrigeration.
9. air-conditioner according to claim 8, it is characterised in that described air-conditioner also comprises memorizer, is used for storing the first temperature threshold, the second temperature threshold, first frequency section and the first setting degree, and second frequency section and the second setting degree; Described controller specifically for:
Judge that whether described outdoor environment temperature is lower than described first temperature threshold and higher than described second temperature threshold;
If so, control air-conditioner and entered for the first cryogenic refrigeration stage: reduce cooler compressor running frequency to first frequency section, and the degree of superheat of described air-conditioner is improved the first setting degree;
If it is not, continue to judge that whether described outdoor environment temperature is lower than described second temperature threshold;
If so, entered for the second cryogenic refrigeration stage: reduce cooler compressor frequency to second frequency section, and the air-conditioner degree of superheat is improved the second setting degree.
10. air-conditioner according to claim 8, it is characterized in that, described air-conditioner also includes off-premises extension and indoor fan, described controller is additionally operable to: when judging the outdoor environment temperature detected lower than design temperature threshold value, reduction along with described outdoor environment temperature, improve indoor fan rotating speed and/or gradually reduce outdoor fan rotating speed, so that described compressor forms normally compressed ratio.
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