CN1101711A - Method for detecting freeze of a cooling/heating air conditioner - Google Patents
Method for detecting freeze of a cooling/heating air conditioner Download PDFInfo
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- CN1101711A CN1101711A CN 94107732 CN94107732A CN1101711A CN 1101711 A CN1101711 A CN 1101711A CN 94107732 CN94107732 CN 94107732 CN 94107732 A CN94107732 A CN 94107732A CN 1101711 A CN1101711 A CN 1101711A
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- temperature
- frosting
- specified time
- heat exchanger
- guan wen
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Abstract
The method for detecting freezing of a cooling/heating air conditioner comprises a freezing determination initializing step of sensing piping temperature every predetermined minute if a compression unit is continuously operating for a predetermined time at a heating operation mode; a freezing predetermining step of comparing a predetermined temperature with a temperature difference between the piping temperatures before and after every predetermined minute if the sensed piping temperature is below a reference temperature and thus determining the starting of the freezing; and a freezing determining step of comparing a predetermined temperature with a temperature difference between the piping temperatures before and after every predetermined minute, determining the freezing state according to the result thereof and performing a defrosting operation.
Description
The present invention relates to a kind of cooling air-conditioner, particularly relate to a kind of method that detects frosting on the cooling air-conditioner, because air-conditioner can correctly detect the frosting of outdoor unit of air-conditioner, so this method can improve the efficiency of heating surface of air-conditioner.
Usually, the built-up air conditioner of cooling is divided into indoor unit and outdoor unit, selection according to user's cooling pattern, finish the cooling operation by the heat-exchanger rig of operation outdoor unit and the heat-exchanger rig of conversion compression set and indoor unit, refrigerant flows through therein, makes the air in refrigerant itself and the room carry out heat exchange.
The heat that is sent to the refrigerant of the high temperature and high pressure of changing compression set is released in the condensing unit, and this condensing unit converts refrigerant gas to the liquid cryogen of normal temperature and high pressure.
Make it be transformed into the liquid refrigerant of low-temp low-pressure by capillary the refrigerant liquid of this normal temperature and high pressure.
The air that the liquid refrigerant of low-temp low-pressure and hair-dryer device infeeded and entered the room or the outside, room carries out heat exchange.
This liquid refrigerant is sucked by compression set after converting gas to, and produces effective cooling or heating through overcompression, condensation, expansion and evaporation process repeatedly continuously.
Fig. 1 is the block diagram of a conventional cooling air-conditioner, and this air-conditioner has an indoor unit 100 and an outdoor unit 200.Indoor unit 100 comprises that is accepted a parts 100a, and the pattern that it is selected according to remote controller 101 receives key signals as cooling or heating mode; An indoor temperature sensing element 100b, it is used for the detection indoor temperature, and one first microcomputer 100c, it is according to being used for controlling transfer of data with outdoor unit and operation indoor unit by accepting room temperature that mode signal that parts 100a obtains and room temperature sensing element 100b obtain respectively.
When having selected refrigerating mode by remote controller 101, indoor unit 100 accept the key signals that parts 100a accepts the refrigerating mode of remote controller 101, this key signals is carried out electric treatment, then this signal is transferred to the first microcomputer 100c.
The first microcomputer 100c is reading after accept refrigerating mode signal that parts 100a receives, by connection with this transfer of data of reading in the second microcomputer 200a of outdoor unit 200.
The data manipulation conversion compression member 200b and the partly 200c that dries that the second microcomputer 200a of outdoor unit 200 receives according to the first microcomputer 100c from indoor unit 100.
This conversion compression member 200b is compressed into the refrigerant of low temperature, low pressure the gas refrigerant of high temperature, high pressure, gas refrigerant carries out heat exchange with the extraneous air that is sucked by blowing parts 200c in the heat exchanger (promptly as condenser) of outdoor unit 200, thus the high-pressure liquid refrigerant that refrigerant is transformed into normal temperature with heating by outside inhaled air.
And the refrigerant liquid that becomes normal temperature, high pressure in the heat exchanger of outdoor unit 200 is transformed into the liquid refrigerant of low temperature, low pressure after by capillary and is sent in the heat exchanger (being evaporimeter) of indoor unit 100.
The liquid refrigerant of this low temperature, low pressure is delivered in the heat exchanger of indoor unit 100 and is carried out heat exchange with the cooling room air with the room air that is sucked by blowing parts 200c, be transformed into gas refrigerant then and be sent back to once more among the conversion compression member 200b, just can heat outdoor indoor cooling by carrying out above-mentioned circulation repeatedly continuously.
On the other hand, if the user has selected heating mode, the low temperature that conversion compression member 200b will come in, the refrigerant of low pressure are compressed into the gas refrigerant of high temperature, high pressure, and still, at this moment the loop direction of refrigerant is opposite with aforesaid refrigerating mode.
That is to say that by the high temperature of conversion compression member 200b conversion, gases at high pressure refrigerant is transformed into normal temperature, high pressure in the heat exchanger (being condenser) of indoor unit 100 liquid refrigerant, indoor temperature has raise.
After this, the refrigerant that becomes normal temperature, high pressure in the heat exchanger of indoor unit flows through capillary, becomes the liquid refrigerant of low temperature, low pressure and is sent in the heat exchanger (being evaporimeter) of outdoor unit 200.
Liquid refrigerant and the extraneous air that is blown into by hair-dryer 200c of sending into low temperature in the heat exchanger of outdoor unit 200, low pressure carries out heat exchange and extraneous air cooled off.Then, the refrigerant that is transformed into gas is sent back to conversion compression member 200b once more, and carrying out above-mentioned circulation repeatedly continuously just can be to indoor heating to outdoor cooling.
As previously mentioned, carry out in the cooling operation at air-conditioner, from beginning heating operation after a period of time of the heat exchanger beginning frosting of outdoor unit 200, the heat exchange of the heat exchanger by outdoor unit 200, the temperature of pipeline reaches to the equilibrium condition that keeps uniform temperature, when beginning frosting on the heat exchanger of outdoor unit 200, the temperature of pipeline will descend significantly.
In this case, the second microcomputer 200a of outdoor unit 200 started a timer (not shown) when temperature that measures as line temperature sensor 200e was lower than 3 ℃, the heat exchanger 200b that such second microcomputer 200a must determine outdoor unit 200 reaches frosting when being lower than-6 ℃ after being lower than-8 ℃, 150 minutes after being lower than-10 ℃, 120 minutes after being lower than-12 ℃, 90 minutes in line temperature after 60 minutes, and carries out defrost operation.
By stopping to change the operation of compression member 200b or after operation mode is become refrigerating mode, the heat exchanger of outdoor unit 200 being carried out defrost operation as a condenser.
In case after defrost operation was finished, timer cut out and begins heating operation once more after just line temperature had reached 3 ℃.
But, the problem that aforesaid cooling air-conditioner exists the efficiency of heating surface to descend, this is owing to after the definite time of changing after compression member begins to operate, the heat exchanger of outdoor unit just was confirmed as frosting when measured Guan Wen was lower than a certain temperature, so it can think frosting on the outdoor unit heat exchanger mistakenly the second microcomputer 200a, even in fact not frosting.
And, aforesaid heating/cooling air conditioner also has another problem, promptly is lower than 0 ℃ of when operation when the externally quite cold temperature of air-conditioner, promptly as when the temperature of the heat exchanger of outdoor unit is very low, temperature on the heat exchanger of outdoor unit will descend very fast, and makes defrost operation frequent.(in fact, it is difficult to frosting, so the speed owing to the very low frosting of saturated vapour pressure is very slow when temperature is lower than 0 ℃).
As mentioned above, aforesaid mensuration frosting method exists because the decline of the efficiency of heating surface descends the practicality of product and accelerates the problem of product deterioration owing to frequent changes circulates.
The object of the present invention is to provide a kind of method of measuring the frosting of cooling type air-conditioner, this measures frosting on the heat exchanger according to variation of temperature rate on the pipeline.
Another object of the present invention provides a kind of method of measuring the frosting of cooling type air-conditioner, wherein begin to change from heating operation compression partly continued operation the regular hour measured frosting on the heat exchanger afterwards.
Another purpose of the present invention provides a method of measuring the frosting of cooling type air-conditioner, wherein is just to measure frosting on the heat exchanger when being lower than a certain value when having only Guan Wen when heat exchanger at heating operation.
A further object of the present invention provides a kind of cooling type air-conditioner, in each preset time after the conversion compression set begins to turn round continuously a period of time, when the temperature difference of the Guan Wen of heat exchanger in the front and back in a predetermined time limit is higher than a certain value, be measured to frosting and begin, and carry out defrost operation.After end sometime after this, air-conditioner is finished defrosting when the temperature difference is higher than setting value before and after another pre-specified time.
A present invention also purpose provides a kind of cooling type air-conditioner, and it only just is measured to frosting during a certain temperature when the Guan Wen of heat exchanger apparatus is lower than cooling down operation, thereby carries out defrost operation.
Above purpose of the present invention and feature can be by providing a kind of method of measuring frosting to finish for a cooling air-conditioner, this method comprises the step of measuring initial frosting, so that in heating process, when changing compression set after the continuous operation period, by each pre-specified time detector tube temperature; Prediction frosting step, with convenient detection to Guan Wen when being lower than reference temperature(TR), by the beginning that the temperature difference between Guan Wen and predetermined temperature before and after each pre-specified time are recently surveyed frosting mutually; And measure the frosting step, finish frosting and defrost so that survey according to the comparative result of the temperature difference between Guan Wen before and after the scheduled time and reference temperature(TR).
Fig. 1 is a conventional cooling air-conditioner block diagram.
Fig. 2 is an outdoor unit Tube Sheet of Heat Exchanger temperature variation diagram when heating operation.
Fig. 3 is the flow chart illustration of the detection frosting method of cooling air-conditioner of the present invention.
Fig. 2 is the pipe temperature variation diagram of outdoor unit heat exchanger when heating operation, and Fig. 3 is the flow chart illustration of the detection frosting method of cooling air-conditioner of the present invention.
The detection frosting method of cooling air-conditioner of the present invention comprises: measure the step of initial frosting, so that in heating process, as conversion compression set 200b continuous operation section time t
1After, by each pre-specified time detection Guan Wen; Prediction frosting step, the Guan Wen that detects with box lunch is lower than reference temperature(TR) T
mThe time, by each is definited time-lag m pipe temperature T before in advance
1With the warm T of pipe after this time limit
2Between temperature difference △ T
1With predetermined temperature T
11Recently judge the beginning of frosting mutually; And measure the frosting step, so that according to the pipe temperature T before the pre-specified time m
2With the warm T of pipe after this time limit
3Between temperature difference △ T
2With reference temperature(TR) T
22Comparative result survey complete frosting and defrost.
The step of measuring initial frosting is to detect whether to change compressor in work (ST1 and ST2) when heating operation,, removes by discovery conversion compressor the time limit (ST3) of continuous operation if not working, if the conversion compressor is in work (ST4), from beginning during continued operation to time limit T through the continuous operation of back detection after a while
1If, and after having passed through a definite time limit, in each predetermined time limit, detect the temperature (ST5) of pipeline.
Prediction frosting step comprises following each step: will measure the line temperature and the reference temperature Tm that detect in the initial frosting step and compare (ST6), if be higher than reference temperature Tm(ST7 at the Guan Wen that detects pre-specified time m detection) time, and definiting time-lag m in advance turns back in the step (ST5) of detector tube temperature later, if the Guan Wen that detects is lower than reference temperature Tm, then proofread and correct the pipe temperature T1(ST8 that is surveyed), in front the effluxion of detector tube temperature T1 predetermined time limit m post-equalization the pipe temperature T2(ST9 and the ST10 that are surveyed), will be at the pipe temperature T1 before and after the pre-specified time and the temperature difference △ T1 between T2 and a predetermined temperature T11 make comparisons (ST11), if the temperature difference is bigger than predetermined temperature T11, the starting point that then detects the correction frosting is to determine the beginning (ST12) of frosting.
Measuring the frosting step comprises: be not corrected if find the frosting starting point, the frosting starting point that then begins frosting is proofreaied and correct (ST13), after this point calibration is intact during to pre-specified time m detection, when pre-specified time in view of sound-pipe temperature T
2And the pipe temperature T that is measured proofreaied and correct in past tense
3(ST14 and ST15), the temperature difference △ T2 of pipe temperature T2 before and after the m and T3 and a predetermined temperature T22 make comparisons (ST16) will be definited time-lag in advance, if find that temperature difference △ T2 is littler then remove set frosting starting point (ST17) than predetermined value T22, if temperature difference △ T2 is bigger than predetermined value T22, the frosting starting point is set up, and defrost operation (ST18 and ST19) is measured and carried out in the frosting that then stops heat exchanger.
Below with reference to Fig. 1 to the detailed description of the invention.
At first, when the user selectes refrigerating mode with remote controller 101, the conversion of outdoor unit 200 of the present invention compression is the signal that receives from the second microcomputer 200a of outdoor unit 200, the first microcomputer 100c by indoor unit 100 of 200b response partly, and low temperature, the low-pressure refrigerant of coming in compressed and become the gas refrigerant of high temperature, high pressure.
The high temperature of being confessed by conversion compression member 200b, gases at high pressure refrigerant carry out heat exchange with extraneous air that blowing parts 200e sucks in the heat exchanger (being condenser) of outdoor unit 200, the air outside that sucks with heating, and refrigerant is become the liquid refrigerant of normal temperature, high pressure.
After the liquid refrigerant that becomes normal temperature, high pressure in the heat exchanger of outdoor unit flows through capillary, become low temperature, low pressure liquid refrigerant and be sent in the heat exchanger (evaporimeter) of indoor unit 100.
From the heat exchanger of indoor unit 100,, the low temperature that comes, low pressure liquid refrigerant reduces the temperature of room air for carrying out heat exchange with the room air that is sucked by hair-dryer parts 200e.
The refrigerant that becomes gas is sent back among the conversion compression member 200b subsequently, and carrying out above-mentioned circulation repeatedly continuously just can cool room and heat the outside.
On the other hand, after heating mode is selected, as previously mentioned, as prior art with the heat exchanger of indoor unit 100 as an evaporimeter, heat rooms and cooling are outside.
Because conversion compression part 200b moves continuously during heating operation, so at this moment the Guan Wen of outdoor unit heat exchanger descends with the continuous operation of conversion compression part 200b, till the heat cycle stabilizing when the Tube Sheet of Heat Exchanger temperature of outdoor unit 200c keeps poised state.When beginning frosting on the heat exchanger of outdoor unit, the Guan Wenhui picture promptly descends as shown in Figure 2.
Therefore, carry out defrost operation after the objective of the invention is to detect frosting according to flow chart shown in Figure 3, Fig. 3 makes after the pipe temperature according to frosting descends rapidly.
Check the heating mode (ST1) that whether exists from remote controller,, check the operation (ST2) of conversion compression member 200b when finding sometimes.
When the conversion compression member is found to off working state, when finding that promptly operation stops, use an internal timer to remove the continued operation time limit (ST3) of conversion compressor 200b, and when its work of discovery, the continued operation time limit that begins to change compressor 200b.
Then, whether the continued operation time limit of inspection conversion compressor 200b has passed through a definite time limit t1(ST4), if passed through, by the temperature (ST5) of the pipe temperature sensing element detector tube of outdoor unit, and with the temperature and a reference value Tm comparison (ST6) that detect.
As the comparative result in the step (ST6), when higher, just ignore the temperature of pipe as the Guan Wen that find to detect, the temperature of detector tube (ST7) once more after having crossed a pre-specified time m again than reference value Tm.
As the comparative result in the step (ST6), as when finding that the Guan Wen that detects is lower than reference value Tm, just the temperature of Jian Ceing is set to T1(ST8), detecting to check whether to have crossed a predetermined time limit m(ST9 after managing warm T1), if passed through a pre-specified time m, with regard to detector tube temperature T2 and reset (ST10).
Thereafter, pipe temperature T1 that is provided with before and after a pre-specified time m and the temperature difference △ T1 of T2 calculate in step (ST8 and ST9), and with temperature difference △ T1 and a predetermined temperature value T11 make comparisons (ST11).
As the comparative result in the step (ST11), if find the temperature difference greater than predetermined temperature T11, the adjusting of exploring the frosting starting point is to begin frosting (ST12) on the heat exchanger of determining outdoor unit 200.
As the result who explores, if find to have set the starting point of frosting, just determine to have begun frosting (ST18), beginning defrost operation (ST19), if and the frosting starting point is not set in discovery, even begun frosting, also determine frost and do not produce a lot, set frosting starting point (ST13) and manage warm T
2Pre-specified time m(ST14 is checked in the back).
As the check result in the step (ST14), if definite time-lag m mistake in advance, warm T3 detects and the Guan Wen that detects is set (ST15) to managing again.
Thereafter, calculate in step (ST10 and ST15) temperature T 2 of pipe before and after the pre-specified time m and T3 temperature difference △ T2 and with predetermined temperature value T22 make comparisons (ST16).
Because result relatively, if temperature difference △ T2 is littler than predetermined value T22, the starting point of frosting is eliminated (ST17), if and temperature difference △ T2 is when bigger than predetermined value T22, the heat exchanger of outdoor unit 200 begins frosting (ST18), so beginning defrost operation (ST19) becomes heat cycles into the frost of cool cycles to tie on the heat exchanger that removes outdoor unit 200.
In contrast, in cooling down operation with top described the same terms under on the heat exchanger of indoor unit also during frosting, can use the method identical to measure frosting and carry out defrost operation with prior figures 3.
As previously mentioned, owing to the frosting condition on the heat exchanger of having grasped outdoor unit, the present invention stipulates to have only just to carry out defrost operation when frosting acquires a certain degree, so, even when outdoor temperature is lower than zero degree, the present invention also can improve the efficient of heating operation.
Because the raising of the above-mentioned efficiency of heating surface, can provide preferred heating operation to guarantee that the user's is comfortable.
Though the present invention is only described by several embodiment, for those skilled in the art, just can make various modifications and changes from the above mentioned.Therefore all can fall in the scope of the appended claim in back various modifications and changes of the present invention.
Claims (6)
1, a kind of method of mensuration frosting of cooling air-conditioner, comprising step:
In heating process, after the conversion compressor has been worked certain period continuously, by the initial frosting step of mensuration of pre-specified time sound-pipe temperature;
When being lower than a reference temperature, the Guan Wen that detects surveys the prediction frosting step that frosting begins by the temperature difference of the Guan Wen before and after the pre-specified time and first predetermined temperature are compared; And
According to the temperature difference of the Guan Wen before and after pre-specified time after this and the mensuration frosting step that the second predetermined temperature comparison detects frosting and defrosts.
2, method according to claim 1, wherein measure in the initial frosting step and may further comprise the steps:
Whether detection changes compressor in work when heating operation;
If the time limit of finding to change compressor operating then removing continuous operation;
If the conversion compressor is worked, begin to survey the continuous operation time limit through a certain time limit from the continuous operation time limit; And
If find to fix a time frame over and done with then in temperature with pre-specified time sound-pipe.
3, method is according to claim 1 wherein predicted in the frosting step may further comprise the steps: will measure Guan Wenyu one reference temperature that measures in the initial frosting step relatively;
If the Guan Wen that is surveyed is higher than reference temperature, then after when detecting pre-specified time, finding to have passed through pre-specified time, return the step of detector tube temperature;
If when the Guan Wen that surveys is lower than reference temperature, then adjust the Guan Wen that is surveyed;
At the effluxion of pre-detection Guan Wen pre-specified time back set the temperature of being surveyed;
To compare in the temperature difference before and after the pre-specified time and one first predetermined temperature;
If the temperature difference is higher than predetermined temperature, detects the starting point of adjusting frosting and begin with definite frosting; And
If testing result is the adjustment of having made the frosting starting point, then makes the conclusion of frosting and carry out defrost operation.
4, method according to claim 1, measure in the frosting step and may further comprise the steps:
If in prediction frosting step, do not set the frosting starting point, then set the frosting starting point of determining the beginning frosting;
When having set this some back pre-specified time having been detected, when pre-specified time in view of the sound-pipe temperature and tested Guan Wen set in past tense;
The pipe temperature temperature difference and one second predetermined temperature of specified time front and back setting are in advance made comparisons;
When if the temperature difference is lower than predetermined temperature, remove the frosting starting point of setting; And
When if the temperature difference is higher than predetermined temperature, the frosting that finishes on the heat exchanger is measured and the beginning defrost operation.
5, method has according to claim 1 been tied under the white situation on the heat exchanger when wherein only the Guan Wen of heat exchanger is lower than a reference temperature behind the beginning heating operation, just carries out defrost operation.
6, method has according to claim 1 wherein only been tied white situation on the heat exchanger and has just been carried out defrost operation when the Guan Wen that begins to cool down operation back heat exchanger is lower than a reference temperature.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019930009416A KR950014040B1 (en) | 1993-05-29 | 1993-05-29 | Method sensing frost of airconditioner |
| KR9416/93 | 1993-05-29 | ||
| KR9416/1993 | 1993-05-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1101711A true CN1101711A (en) | 1995-04-19 |
| CN1138104C CN1138104C (en) | 2004-02-11 |
Family
ID=19356266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB941077322A Expired - Fee Related CN1138104C (en) | 1993-05-29 | 1994-05-27 | Method for detecting freeze of a cooling/heating air conditioner |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR950014040B1 (en) |
| CN (1) | CN1138104C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101115960B (en) * | 2005-03-03 | 2010-04-14 | 大金工业株式会社 | Air conditioner |
| CN1975276B (en) * | 2003-10-20 | 2010-10-13 | Lg电子株式会社 | Method for controlling air conditioner |
| CN104344502A (en) * | 2013-07-29 | 2015-02-11 | 三星电子株式会社 | Air conditioner and control method thereof |
| CN105571245B (en) * | 2016-01-28 | 2017-12-08 | 珠海格力电器股份有限公司 | Determination methods, judgment means and the air-conditioning system of air-conditioning frosting |
| CN108592299A (en) * | 2018-05-03 | 2018-09-28 | 广东美的暖通设备有限公司 | Defrosting control method and system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104019531B (en) * | 2014-05-30 | 2016-06-22 | 广东美的制冷设备有限公司 | The Defrost method of air-conditioner and air-conditioner |
-
1993
- 1993-05-29 KR KR1019930009416A patent/KR950014040B1/en not_active IP Right Cessation
-
1994
- 1994-05-27 CN CNB941077322A patent/CN1138104C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1975276B (en) * | 2003-10-20 | 2010-10-13 | Lg电子株式会社 | Method for controlling air conditioner |
| CN101115960B (en) * | 2005-03-03 | 2010-04-14 | 大金工业株式会社 | Air conditioner |
| CN104344502A (en) * | 2013-07-29 | 2015-02-11 | 三星电子株式会社 | Air conditioner and control method thereof |
| CN104344502B (en) * | 2013-07-29 | 2019-01-11 | 三星电子株式会社 | Air-conditioning and its control method |
| CN105571245B (en) * | 2016-01-28 | 2017-12-08 | 珠海格力电器股份有限公司 | Determination methods, judgment means and the air-conditioning system of air-conditioning frosting |
| CN108592299A (en) * | 2018-05-03 | 2018-09-28 | 广东美的暖通设备有限公司 | Defrosting control method and system |
| CN108592299B (en) * | 2018-05-03 | 2020-09-29 | 广东美的暖通设备有限公司 | Defrosting control method and system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1138104C (en) | 2004-02-11 |
| KR950014040B1 (en) | 1995-11-20 |
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Granted publication date: 20040211 |