CN1215295C - Air conditioner and its defrosting method - Google Patents
Air conditioner and its defrosting method Download PDFInfo
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- CN1215295C CN1215295C CN 01114641 CN01114641A CN1215295C CN 1215295 C CN1215295 C CN 1215295C CN 01114641 CN01114641 CN 01114641 CN 01114641 A CN01114641 A CN 01114641A CN 1215295 C CN1215295 C CN 1215295C
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- temperature difference
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Abstract
The present invention relates to an air conditioner which automatically controls the defrosting process and a defrosting method thereof. The present invention uses outdoor double temperature sensing heads according to the change of the operating condition of the air conditioner during heating operation, i.e. the two sensing heads which are used for detecting outdoor environment temperature and used for detecting the coil pipe temperature of an outdoor heat exchanger, to intelligently judge the conditions for carrying out and canceling defrosting by particular algorithm. A control parameter is automatically corrected by the change of the system running condition and the environmental condition so that the defrosting can be accurately and efficiently finished under various weather conditions.
Description
Technical field
The present invention relates to air-conditioner device, more particularly, relate to a kind of air conditioner Defrost method.
Background technology
The Defrost mode that domestic existing heat pump type air conditioner generally adopts outdoor single temperature-sensitive head to judge.This scheme mainly is two single temperature values according to outdoor coil pipe used temperature-sensitive head, judges the moment that enters and withdraw from defrosting, and is not intelligent.Because this constant temperature Defrost mode, therefore the otherness of refrigeration system operation when not fully taking into account the variation of indoor and outdoor surroundings condition is easy to produce erroneous judgement and breaks, and problems such as defrosting is unclean, frostless defrosting occur; And, being lower than when setting defrosting and entering temperature in environment temperature, the air conditioner of constant temperature Defrost mode can't normally move.
The Defrost method that adopts indoor pair of temperature-sensitive head to judge is also arranged.When surpassing some design conditions, start defrost operation.These conditions comprise for two measures the maximum temperature difference of temperature and the difference limit that is allowed between these current differences of measuring temperature.Two are measured temperature is indoor coil pipe and by indoor coil institute indoor air heated temperature.But this kind scheme is utilized indoor thermometry element, for changing because of outdoor environment temperature or frosting is former thereby the variation of the indoor load that causes can not be made good identification, can produce the disconnected phenomenon of erroneous judgement; In addition, utilize indoor two temperature-sensitive heads to go to judge indirectly that totally whether outdoor heat exchanger defrosting, exists destabilizing factor, it is disconnected also may to produce erroneous judgement.
Summary of the invention
The object of the present invention is to provide a kind of air conditioner and the Defrost method thereof that can control defrost process automatically, overcome the above-mentioned defective of prior art, can make heat pump type air conditioner under different areas and various weather conditions, can both finish defrosting accurately, rapidly, efficiently, improve its low-temperature heating runnability greatly, realize the adaptivity of air-conditioning, satisfy the thermal comfort requirement of different regions user under different weather conditions environment.
To achieve these goals, construct a kind of air conditioner, comprising: central control unit; The timer that can carry out timing to compressor operating time and Defrost operation time; It is characterized in that described air conditioner also comprises: the outdoor heat exchange actuator temperature temperature-sensitive head that detects the pipe temperature of air-conditioning unit room external heat exchanger; Detect the outdoor environment temperature temperature-sensitive head of outside air temperature, described central control unit is by the variation relation between detected outdoor heat exchange actuator temperature and the outdoor environment temperature, and in conjunction with compressor operating time and Defrost operation time, judge long-pending frost and defrosting situation on the off-premises station, and control enters or withdraws from Defrost operation.
A kind of self adaptation Defrost method of air conditioner, it is characterized in that, the central control unit of air conditioner is by the difference between detected outdoor heat exchange actuator temperature and the outdoor environment temperature, and, judge long-pending frost and the defrosting situation on the off-premises station according to the following steps and control to enter or withdraw from Defrost operation in conjunction with compressor operating time and Defrost operation time:
(1) heating operation begins, and timer is to carrying out timing the running time of compressor, and when the time of heating reached Tm1, the temperature of measuring cell external heat exchanger and outdoor environment temperature were calculated temperature approach between the two, and preserved as the standard temperature approach;
When (2) time of heating was equal to or greater than Tm2, the temperature of kinetic measurement outdoor heat exchanger and outdoor environment temperature were calculated dynamic temperature difference value between the two;
(3) when described dynamic temperature difference value is not less than predetermined temperature difference controlling value and described standard temperature approach sum, enters Defrost operation, and the Defrost operation time is carried out timing by timer;
(4) when Defrost operation time during,, then keep Defrost operation and timing if the temperature of outdoor heat exchanger is lower than predetermined defrosting end temp less than predetermined maximum defrosting time; If the temperature of outdoor heat exchanger is equal to or greater than predetermined defrosting end temp, then judge whether to carry out parameter adjustment and finish Defrost operation;
(5) if Defrost operation is equal to or greater than predetermined maximum defrosting time, then judge whether need carry out parameter adjustment and finish Defrost operation,
Wherein, described Tm1 is the moment that measures the normal temperature difference, and promptly air-conditioning enters stable operation and is in moment of best heat pump state; Described Tm2 is the shortest heating operation time of heat pump operating mode.
Self adaptation Defrost method according to air conditioner provided by the invention is characterized in that, in described step (4), if the Defrost operation time is more than or equal to the predetermined too early judgement time of defrosting then finish Defrost operation and enter next cycle heating operation; Otherwise carry out finishing Defrost operation again and entering next cycle heating operation after the parameter adjustment.Wherein, the process of parameter adjustment is as follows: multiply by the first adjustment coefficient with temperature difference controlling value and try to achieve its product, or add that with temperature difference controlling value second adjusts parameter and try to achieve itself and (can select wherein a kind of mode), if its result is not less than the higher limit of temperature difference controlling value, then getting this higher limit is that current temperature difference controlling value finishes Defrost operation then and enters next cycle heating operation; Otherwise with described result is current temperature difference controlling value, finishes Defrost operation then and enters next cycle heating operation.Wherein, described first number range of adjusting coefficient is between 1-3, and second adjusts the number range of parameter between 0-10 ℃.
Self adaptation Defrost method according to air conditioner provided by the invention is characterized in that, in described step (5), does not judge temperature only then finishes Defrost operation and enter next cycle heating operation if the temperature of outdoor heat exchanger is higher than predetermined defrosting; Otherwise carry out finishing Defrost operation again and entering next cycle heating operation after the parameter adjustment.Wherein, the process of parameter adjustment is as follows: multiply by the 3rd adjustment coefficient with temperature difference controlling value and try to achieve its product, or deduct the 4th with temperature difference controlling value and adjust parameter with reference to trying to achieve its difference (can select wherein a kind of mode), if its result is not more than the lower limit of temperature difference controlling value, then getting this lower limit is that current temperature difference controlling value finishes Defrost operation then and enters next cycle heating operation; Otherwise with described result is current temperature difference controlling value, finishes Defrost operation then and enters next cycle heating operation.Wherein, the described the 3rd number range of adjusting coefficient is between 0-1, and the 4th adjusts the number range of parameter between 0-5 ℃.
The present invention is by outdoor two temperature-sensitive head sensing chamber external heat exchangers and outdoor environment temperature, utilize specific algorithm, allow to entering and withdraw from constantly of intelligent decision defrosting, and can carry out the oneself to the control parameter according to the variation of system operation situation and environment temperature and revise, realize defrosting accurately and efficiently.Choose with the closest parameter of frosting situational relationship is judged defrosting and enter and defrost the finish time, specific algorithm has more the parameter zero offset capability, guarantees that defrosting is clean, rapidly.
Description of drawings
The present invention will and be illustrated in conjunction with the accompanying drawings by preferred embodiment, wherein:
Fig. 1 is the circulation route figure during heating operation in the existing air conditioner;
Fig. 2 is the circulation route figure during refrigerating operaton in the existing air conditioner;
Fig. 3 is the flow chart according to air conditioner Defrost operation of the present invention.
The specific embodiment
As the flow chart of Fig. 3 for air conditioner defroster working procedure of the present invention, wherein symbol B1 to B16 represents its each step; T1 represents outdoor environment temperature; The temperature of T2 agent's room external heat exchanger coil pipe; X1 is a temperature difference controlling value, and its size is relevant with temperature and relative humidity, and the initial input value does not have strict demand; A is the higher limit of X1; B is the lower limit of X1; The outdoor heat exchange organ pipe temperature condition that C1 representative defrosting finishes; The unclean judgement temperature of C2 representative defrosting; Tm1 is for measuring normal temperature difference DELTA T target constantly, and promptly air-conditioning enters stable operation and is in moment of best heat pump state; Tm2 is the shortest heating operation time of heat pump operating mode; Tm3 is the maximum defrosting time of heat pump operating mode; Tm4 is the heat pump operating mode too early judgement time that defrosts.
For the long-pending white situation on sensing chamber's external heat exchanger, by definite defrosting condition of the heating operation time of outdoor heat exchanger temperature T 2, outdoor environment temperature T1, temperature difference controlling value X1 and compressor.
Step B1, heating operation begins, and as shown in Figure 1, the circulation route during heating operation is: compressor 1-cross valve 4-indoor heat exchanger 2-capillary 5-capillary 7-outdoor heat exchanger 3-cross valve 4-compressor 1.After heating operation begins, the timer program automatic clear of control module and the running time that begins to calculate compressor.When air conditioner enters stable operation and is in accurate best heat pump state, be and measure normal temperature difference Δ T target Tm1 constantly.Wherein the temperature T 2 of outdoor heat exchanger is measured by outdoor pipe temperature determinator; Outside air temperature T1 is measured by the outdoor environment temperature determinator.Subsequently, calculate the temperature approach Δ T=T1-T2 between outdoor heat exchanger temperature T 2 and the outdoor environment temperature T1, and preserve as standard temperature difference reference value Δ T mark.
Step B2, if the time of heating is equal to or greater than the default the shortest heating operation time T of heat pump operating mode m2, flow process enters step B3; Otherwise getting back to step B2 continues the time of heating is carried out timing.
In step B3, the temperature T 2 of measuring cell external heat exchanger and outdoor environment temperature T1 once more, and calculate its temperature approach, obtain dynamic temperature approach Δ T.
Step B4, with temperature approach Δ T and a predetermined temperature difference controlling value X1 and step B1 deposit standard temperature difference reference value Δ T mark sum (Δ T mark+X1) relatively, if less than this and value, flow process turns back to step B3, i.e. temperature approach Δ T dynamically once more; If more than or equal to this and value, then be defined as frosting condition, promptly at this moment the long-pending frost on off-premises station reaches to a certain degree.In order to carry out the Defrost operation of air conditioner, flow process enters step B5.
In step B5, Defrost operation begins, and control module is with the timer zero clearing and begin to calculate defrosting time.Compressor, blower fan close, and cross valve switches; After a while, compressor start.As shown in Figure 2, cold-producing medium is mobile as follows by refrigeration periodic duty: compressor 1-cross valve 4-outdoor heat exchanger 3-check valve 6-capillary 5-indoor heat exchanger 2-cross valve 4-compressor 1.Outdoor heat exchanger 3 begins to obtain heating, carries out Defrost operation, makes that the long-pending frost on the outdoor heat exchanger 3 is eliminated,
Step B6 is if defrosting time then enters step B7 and carries out condition judgment again less than the maximum defrosting time Tm3 of predetermined heat pump operating mode; Otherwise enter step B8.
In step B7, when the temperature T 2 of outdoor heat exchanger is equal to or greater than predetermined defrosting end temp condition C 1, then flow process enters B13; Otherwise return step B6 and continue timing.
In step B13,, then forward step B12 to if defrosting time is not less than the predetermined heat pump operating mode too early judgement time Tm4 that defrosts; If the Defrost operation time that timer is counted is less than the too early judgement time Tm4 of defrosting, represent that then whole flow process just finished defrosting work within a short period of time, and then deducibility to go out to enter time of step B5 too early, the time that just enters Defrost operation is too early, therefore should adjust it, the time that just will enter Defrost operation transfers a little later, automatically revise step B14 so need enter parameter, revise temperature difference controlling value X1, enter step B15 after making it be multiplied by the first adjustment coefficient E1 (between the 1-3, desirable 2).
In step B15, can restrain for making temperature difference controlling value X1, set the upper limit A of X1, if new temperature difference controlling value X1 then enters step B16 more than or equal to its upper limit A, be its upper limit A no matter why X1 is worth equal value, and then enter step B12; Otherwise as current temperature difference controlling value X1, directly enter step B12 then with step B14 gained result.
Another branch road in step B8, is not judged temperature C2 relatively with outdoor heat exchange organ pipe temperature T2 with defrosting only, if T2, represents that defrosting effect is good greater than C2, then flow process jumps to step B12; Otherwise expression does not reach the purpose of defrosting fully yet by preset time, and then deducibility to go out to enter time of step B5 late excessively, the time that just enters Defrost operation is late excessively, therefore should adjust it, the time that just will enter Defrost operation transfers earlier, so need enter step B9, revises temperature difference controlling value X1, enter step B10 after making it be multiplied by the 3rd adjustment coefficient F1 (between 0～1, desirable 0.3) herein.
Enter step B10,, then enter step B11, enter step B12 again after getting X1=B if revised maximum temperature difference controlling value X1 is not more than its lower limit B; Otherwise as current temperature difference controlling value X1, enter step B12 then with step B9 gained result.
In step B12, withdraw from Defrost operation, compressor cuts out, and cross valve switches to the state of heating after a while, and compressor is opened then, thus the flow direction of cold-producing medium is changed into heating the cycle as shown in Figure 1.Simultaneously, flow process turns back to step B1, and reruns.
As mentioned above, the parameter that judging defrosts enters and withdraw from all can be looked concrete condition and be carried out oneself's correction in each heating operation and defrosting cycle, can correctly judge the frosting situation of off-premises station, accurately enter defrosting, and can control defrosting and only under the situation that long-pending frost is arranged, just carry out, withdraw from Defrost operation rapidly after defrosting is clean, change heating operation over to.Promoted the efficient of heating operation like this, substantially.
In addition, when carrying out parameter adjustment,, can add that second adjustment parameter E2 (between 0 ℃-10 ℃, desirable 6 ℃) the gained sum is come and higher limit A compares with temperature difference controlling value X1, and carry out judgment processing by same subsequent step for step B14; For step B9, can deduct the 4th adjustment parameter F 2 (between 0 ℃-5 ℃, desirable 3 ℃) gained difference with temperature difference controlling value X1 and come to compare, and carry out judgment processing by same subsequent step with lower limit B.
Claims (9)
1, a kind of self adaptation Defrost method of air conditioner, it is characterized in that, the central control unit of air conditioner is by the variation relation between detected outdoor heat exchange actuator temperature (T2) and the outdoor environment temperature (T1), and, judge long-pending frost and the defrosting situation on the off-premises station according to the following steps and control to enter or withdraw from Defrost operation in conjunction with compressor operating time and Defrost operation time:
(1) heating operation begins, and timer is to carrying out timing the running time of compressor, and when the time of heating reached Tm1, temperature of measuring cell external heat exchanger (T2) and outdoor environment temperature (T1) were calculated temperature approach between the two, and as standard temperature approach (Δ T
Mark) preserve;
(2) when the time of heating is equal to or greater than Tm2, temperature of kinetic measurement outdoor heat exchanger (T2) and outdoor environment temperature (T1) are calculated dynamic temperature difference value (Δ T) between the two;
(3) be not less than predetermined temperature difference controlling value (X1) and described standard temperature approach (Δ T when described dynamic temperature difference value (Δ T)
Mark) sum (X1+ Δ T
Mark) time, enter Defrost operation, and the Defrost operation time is carried out timing by timer;
(4) when Defrost operation time during,, then keep Defrost operation and timing if the temperature of outdoor heat exchanger (T2) is lower than predetermined defrosting end temp (C1) less than predetermined maximum defrosting time (Tm3); If the temperature of outdoor heat exchanger (T2) is equal to or greater than predetermined defrosting end temp (C1), then judge whether to carry out parameter adjustment and finish Defrost operation;
(5) if the Defrost operation time is equal to or greater than predetermined maximum defrosting time (Tm3), then judge whether need carry out parameter adjustment and finish Defrost operation,
Wherein, described Tm1 is the moment that measures the normal temperature difference, and promptly air-conditioning enters stable operation and is in moment of best heat pump state; Described Tm2 is the shortest heating operation time of heat pump operating mode.
2, the self adaptation Defrost method of air conditioner according to claim 1, it is characterized in that, in described step (4),, then finish Defrost operation and enter next cycle heating operation if the Defrost operation time is equal to or greater than the too early judgement time of predetermined defrosting (Tm4); Otherwise carry out finishing Defrost operation again and entering next cycle heating operation after the parameter adjustment.
3, the self adaptation Defrost method of air conditioner according to claim 2 is characterized in that, in described parameter adjustment, temperature difference controlling value (X1) be multiply by first adjust coefficient (E1);
If its result is not less than the higher limit (A) of temperature difference controlling value, then getting this higher limit (A) is current temperature difference controlling value (X1), finishes Defrost operation then and enters next cycle heating operation; Otherwise with described result is current temperature difference controlling value (X1), finishes Defrost operation then and enters next cycle heating operation.
4, the self adaptation Defrost method of air conditioner according to claim 2 is characterized in that, in described parameter adjustment, temperature difference controlling value (X1) is added that second adjusts parameter (E2);
If its result is not less than the higher limit (A) of temperature difference controlling value, then getting this higher limit (A) is current temperature difference controlling value (X1), finishes Defrost operation then and enters next cycle heating operation; Otherwise with described result is current temperature difference controlling value (X1), finishes Defrost operation then and enters next cycle heating operation.
According to the self adaptation Defrost method of claim 3 or 4 described air conditioners, it is characterized in that 5, described first number range of adjusting coefficient (E1) is between 1-5, second adjusts the number range of parameter (E2) between 0 ℃-10 ℃.
6, the self adaptation Defrost method of air conditioner according to claim 1, it is characterized in that, in described step (5), if being higher than predetermined defrosting, the temperature of outdoor heat exchanger (T2) do not judge temperature (C2) only, then finish Defrost operation and enter next cycle heating operation; Otherwise carry out finishing Defrost operation again and entering next cycle heating operation after the parameter adjustment.
7, the self adaptation Defrost method of air conditioner according to claim 6 is characterized in that, in described parameter adjustment, temperature difference controlling value (X1) be multiply by the 3rd adjust coefficient (F1);
If its result is not more than the lower limit (B) of temperature difference controlling value, then getting this lower limit is current temperature difference controlling value (B), finishes Defrost operation then and enters next cycle heating operation; Otherwise with described result is current temperature difference controlling value (X1), finishes Defrost operation then and enters next cycle heating operation.
8, the self adaptation Defrost method of air conditioner according to claim 6 is characterized in that, in described parameter adjustment, temperature difference controlling value (X1) is deducted the 4th adjust parameter (F2);
If its result is not more than the lower limit (B) of temperature difference controlling value, then getting this lower limit is current temperature difference controlling value (B), finishes Defrost operation then and enters next cycle heating operation; Otherwise with described result is current temperature difference controlling value (X1), finishes Defrost operation then and enters next cycle heating operation.
According to the self adaptation Defrost method of claim 7 or 8 described air conditioners, it is characterized in that 9, the described the 3rd number range of adjusting coefficient (F1) is between 0-1, the 4th adjusts the number range of parameter (F2) between 0 ℃-5 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 01114641 CN1215295C (en) | 2001-04-18 | 2001-04-18 | Air conditioner and its defrosting method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 01114641 CN1215295C (en) | 2001-04-18 | 2001-04-18 | Air conditioner and its defrosting method |
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| CN1381698A CN1381698A (en) | 2002-11-27 |
| CN1215295C true CN1215295C (en) | 2005-08-17 |
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| CN 01114641 Expired - Fee Related CN1215295C (en) | 2001-04-18 | 2001-04-18 | Air conditioner and its defrosting method |
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-
2001
- 2001-04-18 CN CN 01114641 patent/CN1215295C/en not_active Expired - Fee Related
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| CN107917504A (en) * | 2017-10-11 | 2018-04-17 | 青岛海尔空调器有限总公司 | Air-conditioning and its defrosting control method |
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| Publication number | Publication date |
|---|---|
| CN1381698A (en) | 2002-11-27 |
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