CN105066362A - Air-conditioner refrigerant missing detection method and device - Google Patents
Air-conditioner refrigerant missing detection method and device Download PDFInfo
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- CN105066362A CN105066362A CN201510524587.0A CN201510524587A CN105066362A CN 105066362 A CN105066362 A CN 105066362A CN 201510524587 A CN201510524587 A CN 201510524587A CN 105066362 A CN105066362 A CN 105066362A
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- 239000003507 refrigerant Substances 0.000 title claims abstract description 60
- 238000001514 detection method Methods 0.000 title claims abstract description 50
- 238000005057 refrigeration Methods 0.000 claims abstract description 10
- 230000008034 disappearance Effects 0.000 claims description 84
- 239000002826 coolant Substances 0.000 claims description 82
- 238000004378 air conditioning Methods 0.000 claims description 19
- 230000003750 conditioning effect Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 4
- 230000007423 decrease Effects 0.000 description 11
- 238000001816 cooling Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
Abstract
The invention discloses an air-conditioner refrigerant missing detection method. The process of the air-conditioner refrigerant missing detection method comprises that when an air-conditioner is started and operated in a refrigeration mode, the initial temperature of an indoor heat exchanger is obtained; after the air-conditioner is operated for a first preset period, a first temperature difference between the current temperature and the initial temperature of the indoor heat exchanger is obtained; when the first temperature difference is smaller than a first preset temperature difference, the air-conditioner is controlled to be operated for a second preset period according to a preset refrigeration operation parameter, and a second temperature difference between the current indoor environment temperature and the current temperature of the indoor heat exchanger of the air-conditioner is obtained; and when the obtained second temperature difference is smaller than a second preset temperature difference, it is judged that air-conditioner refrigerant is missing. An air-conditioner refrigerant missing detection device is further provided. According to the air-conditioner refrigerant missing detection method and device, accuracy of air-conditioner refrigerant missing detection is improved.
Description
Technical field
The present invention relates to air-conditioner technical field, particularly relate to a kind of air-conditioner coolant disappearance detection method and device.
Background technology
At present for the detection of air-conditioner coolant disappearance, indoor heat exchanger for air-conditioner arranges a preset temperature as the benchmark judged, when detecting that indoor heat exchanger Current Temperatures is greater than preset temperature, just thinking and there occurs because the refrigerant that the reasons such as coolant leakage cause lacks and reports.Such as, but when reality judges, because the practical service environment of air-conditioner is different, the differences such as indoor and outdoor surroundings temperature, conditioners running conditions, adopt fixing preset temperature as single detection reference, cause detecting the probability of makeing mistakes very high.
Summary of the invention
The invention provides a kind of air-conditioner coolant disappearance detection method and device, its main purpose is the accuracy strengthening the judgement of air-conditioner coolant disappearance.
For achieving the above object, the invention provides a kind of air-conditioner coolant disappearance detection method, this air-conditioner coolant disappearance detection method comprises:
When opening air-conditioner and run in a chiller mode, obtain the initial temperature of indoor heat exchanger;
After described air-conditioner runs the first preset duration, obtain the first temperature difference of described indoor heat exchanger Current Temperatures and described initial temperature;
When described first temperature difference is less than the first preset temperature difference, control after described air-conditioner runs the second preset duration according to the refrigerating operaton parameter preset, to obtain the second temperature difference of the indoor heat exchanger Current Temperatures of current indoor environment temperature and described air-conditioner;
When described second temperature difference got is less than the second preset temperature difference, judge that described air-conditioner coolant lacks.
Preferably, described after described air-conditioner runs the first preset duration, after obtaining the step of the first temperature difference of described indoor heat exchanger Current Temperatures and described initial temperature, described air-conditioner coolant disappearance detection method also comprises:
When described second temperature difference is more than or equal to the second preset temperature difference, judges that described air-conditioner coolant is sufficient, continue to run described air-conditioner with described refrigeration mode.
Preferably, when the described air-conditioner of described unlatching also runs in a chiller mode, the step obtaining the initial temperature of described indoor heat exchanger comprises:
When opening described air-conditioner and run in a chiller mode, obtain the time interval between the time point of described air-conditioner unlatching and last unused time point;
When described interval greater than prefixed time interval time, obtain the Current Temperatures of described indoor heat exchanger, and using the described Current Temperatures that the gets initial temperature as described indoor heat exchanger.
Preferably, described when described first temperature difference is less than the first preset temperature difference, control described air-conditioner and comprise according to the step of the refrigerating operaton parameter operation preset:
When described first temperature difference is less than the first preset temperature difference, closes the compressor of described air-conditioner, after the 3rd preset duration, restart described compressor;
Continue the step performing the first temperature difference obtaining described indoor heat exchanger Current Temperatures and described initial temperature, until be consecutively detected the number of times that described first temperature difference is less than the first preset temperature difference to be more than or equal to preset times, control described air-conditioner and run the second preset duration according to the refrigerating operaton parameter preset.
Preferably, the step that the described air-conditioner of described control runs the second preset duration according to the refrigerating operaton parameter preset comprises:
Obtain outdoor environment temperature, when the described outdoor environment temperature got is less than the first preset temperature, controls described air-conditioner and run the second preset duration according to the first refrigerating operaton parameter preset;
When the described outdoor environment temperature got is more than or equal to the first preset temperature, control described air-conditioner and run the second preset duration according to the second refrigerating operaton parameter preset, wherein, described first refrigerating operaton parameter is greater than described second refrigerating operaton parameter.
In addition, for achieving the above object, the present invention also provides a kind of air-conditioner coolant to lack checkout gear, and this air-conditioner coolant disappearance checkout gear comprises:
Temperature detecting module, during for opening described air-conditioner and running in a chiller mode, obtains the initial temperature of described indoor heat exchanger;
Described temperature detecting module, also for after described air-conditioner runs the first preset duration, obtains the first temperature difference of described indoor heat exchanger Current Temperatures and described initial temperature;
Airconditioning control module, during for being less than the first preset temperature difference when described first temperature difference, controlling described air-conditioner and runs the second preset duration according to the refrigerating operaton parameter preset;
Described temperature detecting module, also for after described air-conditioner runs the second preset duration according to the refrigerating operaton parameter preset, obtains the second temperature difference of the indoor heat exchanger Current Temperatures of current indoor environment temperature and described air-conditioner;
Refrigerant judge module, during for being less than the second preset temperature difference when described second temperature difference got, judges that described air-conditioner coolant lacks.
Preferably, described refrigerant judge module, time also for being more than or equal to the second preset temperature difference when described second temperature difference, judges that described air-conditioner coolant is sufficient, continues to run described air-conditioner with described refrigeration mode.
Preferably, described temperature detecting module comprises:
Time acquisition unit, during for opening described air-conditioner and running in a chiller mode, obtains the time interval between the time point of described air-conditioner unlatching and last unused time point;
Temperature detecting unit, for when described interval greater than prefixed time interval time, obtain the Current Temperatures of described indoor heat exchanger, and using the described Current Temperatures that the gets initial temperature as described indoor heat exchanger.
Preferably, described airconditioning control module, time also for being less than the first preset temperature difference when described first temperature difference, closes the compressor of described air-conditioner, restarts described compressor after the 3rd preset duration;
Described second temperature difference module, time also for being less than the first preset temperature difference when described first temperature difference, obtains the first temperature difference of described indoor heat exchanger Current Temperatures and described initial temperature;
Described airconditioning control module, time also for being more than or equal to preset times at the number of times being consecutively detected described first temperature difference and being less than the first preset temperature difference, controlling described air-conditioner and running the second preset duration according to the refrigerating operaton parameter preset.
Preferably, described airconditioning control module comprises:
Temperature acquiring unit, for obtaining outdoor environment temperature;
Conditioning control unit, during for being less than the first preset temperature when the described outdoor environment temperature got, controlling described air-conditioner and running the second preset duration according to the first refrigerating operaton parameter preset;
Described conditioning control unit, time also for being more than or equal to the first preset temperature when the described outdoor environment temperature got, control described air-conditioner and run the second preset duration according to the second refrigerating operaton parameter preset, wherein, described first refrigerating operaton parameter is greater than described second refrigerating operaton parameter.
The air-conditioner coolant disappearance detection method that the present invention proposes and device, when judging whether air-conditioner lacks refrigerant, line by indoor heat exchanger from start to air-conditioner and run the first temperature difference after a period of time and tentatively judge air-conditioner whether refrigerant disappearance, when the first temperature difference is less than the first preset temperature difference, control air-conditioner and run certain time length according to default operational factor, after its state reaches and stablizes, the second temperature difference between current indoor environment temperature and indoor heat exchanger Current Temperatures is utilized again to judge, if the temperature difference is too small, judge refrigerant disappearance, through twice judgement, improve the accuracy that refrigerant disappearance detects.
Accompanying drawing explanation
Fig. 1 is the flow chart of air-conditioner coolant of the present invention disappearance detection method first embodiment;
Fig. 2 is the refinement schematic flow sheet of the initial temperature obtaining step of indoor heat exchanger in air-conditioner coolant of the present invention disappearance detection method the 3rd embodiment;
Fig. 3 controls the refinement schematic flow sheet of air-conditioner according to the refrigerating operaton parameter operating procedure preset in air-conditioner coolant of the present invention disappearance detection method the 4th embodiment;
Fig. 4 is the high-level schematic functional block diagram of air-conditioner coolant of the present invention disappearance checkout gear first embodiment;
Fig. 5 is the refinement high-level schematic functional block diagram of the temperature detecting module of air-conditioner coolant of the present invention disappearance checkout gear the 3rd embodiment.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Detailed description of the invention
Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The invention provides a kind of air-conditioner coolant disappearance detection method.
With reference to shown in Fig. 1, it is the flow chart of air-conditioner coolant disappearance detection method first embodiment of the present invention.
In a first embodiment, this air-conditioner coolant disappearance detection method comprises:
Step S10, when opening air-conditioner and run in a chiller mode, obtains the initial temperature of indoor heat exchanger;
Step S20, after described air-conditioner runs the first preset duration, obtains the first temperature difference of described indoor heat exchanger Current Temperatures and described initial temperature;
Existing air-conditioner is provided with ring temperature sensor and pipe temperature sensor on indoor set, ring temperature sensor is for detecting indoor environment temperature, pipe temperature sensor is for detecting indoor heat exchanger as evaporator temperature, and the temperature detection in the present embodiment is realized by said temperature sensor.
In order to improve the accuracy of testing result, when air-conditioner is opened, first carried out the preliminary judgement of refrigerant disappearance by the change of indoor heat exchanger own temperature.Wherein, the initial temperature of indoor heat exchanger is temperature when being also in closed condition before air-conditioner starts, owing to being engraved in work when pipe temperature sensor is, can after air-conditioner starts, obtain the indoor heat exchanger Current Temperatures started before Preset Time, such as start the temperature of last minute, herein can by pipe temperature sensor obtain temperature go forward side by side line item realize.After air-conditioner runs the first preset duration, obtain the first temperature difference of indoor heat exchanger Current Temperatures and initial temperature, the first preset duration is preferably 5-10 minute.
Step S30, when described first temperature difference is less than the first preset temperature difference, control after described air-conditioner runs the second preset duration according to the refrigerating operaton parameter preset, to obtain the second temperature difference of the indoor heat exchanger Current Temperatures of current indoor environment temperature and described air-conditioner.
After air-conditioner runs the first preset duration, reach stable state.Obtain the first temperature difference of described indoor heat exchanger Current Temperatures and initial temperature, to judge whether the temperature of indoor heat exchanger declines larger, when refrigerant abundance, indoor heat exchanger normally works, refrigerant evaporation heat absorption in it, the temperature recorded in real time can decline fast, produces the larger temperature difference relative to initial temperature.When the temperature difference obtained is less than the first preset temperature difference, the first preset temperature is poor is preferably 2-5 DEG C, and preliminary judgement may be because refrigerant disappearance causes the decline of the temperature of indoor heat exchanger very little even substantially constant.
The present embodiment is in order to avoid air conditioner operation parameters and the different impact judged air-conditioner coolant disappearance of indoor environment temperature, certain time length is run at air-conditioner, after state reaches and stablizes, the detection of refrigerant disappearance is carried out according to the indoor environment temperature of Real-time Obtaining, it should be noted that, the present embodiment is only effective in cooling mode.
About the setting of the refrigerating operaton parameter preset, this parameter can be arranged by user.In the present embodiment, preferably using the specified cooling parameters of air-conditioner as the refrigerating operaton parameter preset, as according to optimum configurations such as specified compressor operating frequency, electronic expansion valve opening, off-premises station motor speeds, these parameters, according to the difference of air-conditioner model, nameplate all have sign.In other embodiments, also close to the specified cooling parameters of air-conditioner as the refrigerating operaton parameter preset, or can be arranged according to indoor and outdoor surroundings temperature by user.
Second preset duration is preferably 5-10 minute in the present embodiment, is to judge after air-conditioner runs a period of time again, reduces because indoor environment temperature does not also reach the stable impact caused testing result.
About the acquisition of the second temperature difference of the indoor heat exchanger Current Temperatures of indoor environment temperature and described air-conditioner, it can be real-time continual detection, also can be that separated in time obtains a temperature difference, such as, after control air-conditioner runs ten minutes according to specified refrigerating operaton parameter, at interval of the second temperature difference obtaining an indoor environment temperature and indoor heat exchanger Current Temperatures 5 seconds.
Step S40, when described second temperature difference got is less than the second preset temperature difference, judges that described air-conditioner coolant lacks.
The refrigerant of air-conditioner is when abundance, the refrigeration of air-conditioner is good, indoor environment temperature can decline to some extent, and in the process of refrigerastion of air-conditioner, the indoor heat exchanger recorded, namely the temperature of evaporimeter can decline rapidly, and far below indoor environment temperature, makes to have larger temperature difference between indoor environment temperature and evaporator temperature.
And between the indoor environment temperature got and evaporator temperature temperature difference be less than second preset temperature difference time, preferably, the second preset temperature difference is 3-6 DEG C.Now, judge air-conditioner coolant disappearance, cause indoor environment temperature to decline very little, evaporator temperature declines very little equally simultaneously, causes the temperature difference between them very little.When described second temperature difference got is more than or equal to the second preset temperature difference, judge that refrigerant is sufficient.
The air-conditioner coolant disappearance detection method that the present embodiment proposes, when judging whether air-conditioner lacks refrigerant, line by indoor heat exchanger from start to air-conditioner and run the first temperature difference after a period of time and tentatively judge air-conditioner whether refrigerant disappearance, when the first temperature difference is less than the first preset temperature difference, control air-conditioner and run certain time length according to default operational factor, after its state reaches and stablizes, the second temperature difference between current indoor environment temperature and indoor heat exchanger Current Temperatures is utilized again to judge, if the temperature difference is too small, judge refrigerant disappearance, through twice judgement, improve the accuracy that refrigerant disappearance detects.
The first embodiment based on air-conditioner coolant disappearance detection method of the present invention proposes the second embodiment of air-conditioner coolant of the present invention disappearance detection method.In the present embodiment, after step S20, this air-conditioner coolant disappearance detection method also comprises step:
When described second temperature difference is more than or equal to the second preset temperature difference, judges that described air-conditioner coolant is sufficient, continue to run described air-conditioner with described refrigeration mode.
When tentatively judging, if detect that indoor heat exchanger has the larger temperature difference to fall, judge that air-conditioner coolant is sufficient, the parameter that can arrange according to user continues operating air conditioner, no longer enters S30 step and judges.
Further, step S40 comprises:
When described second temperature difference got is less than the second preset temperature difference, the step of the second temperature difference of the indoor heat exchanger Current Temperatures obtaining indoor environment temperature and described air-conditioner is performed after Preset Time, until be consecutively detected the number of times that described second temperature difference is less than the second preset temperature difference to be greater than preset times, judge that described air-conditioner coolant lacks.By repeatedly obtaining temperature difference at interval of Preset Time, to improve the accuracy of detection.
Further, after the step s 40, this air-conditioner coolant disappearance detection method also comprises:
Close described air-conditioner, and report the state that described air-conditioner coolant lacks.Such as, can display reminding information on the display floater on air conditioner room unit, know for user, carry out fault detect or add refrigerant; Or, be connected if air-conditioner establishes with the terminal of user, information can be sent to terminal, to point out user.
Further, when described second temperature difference is more than or equal to the second preset temperature difference, judge that described air-conditioner coolant is sufficient, the described air-conditioner of normal operation.
With reference to shown in Fig. 2, the first embodiment based on air-conditioner coolant disappearance detection method of the present invention proposes the 3rd embodiment of air-conditioner coolant of the present invention disappearance detection method.In the present embodiment, step S10 comprises following refinement step:
Step S11, when opening described air-conditioner and run in a chiller mode, obtains the time interval between the time point of described air-conditioner unlatching and last unused time point;
Step S12, when described interval greater than prefixed time interval time, obtain the Current Temperatures of described indoor heat exchanger, and using the described Current Temperatures that the gets initial temperature as described indoor heat exchanger.
Due to air-conditioner after shutdown, the temperature of indoor heat exchanger can't lower immediately and reach normal temperature, and user may start air-conditioner in the short time after closedown air-conditioner once more, if at this time the temperature of indoor heat exchanger is still lower, even if now there is not the refrigerant disappearance that coolant leakage etc. causes, the indoor heat exchanger Current Temperatures recorded and the temperature difference of initial temperature also can be less, therefore, in order to improve the accuracy of judged result, the initial temperature interval greater than acquisition indoor heat exchanger during prefixed time interval between the time point and last unused time point of air-conditioner unlatching, prefixed time interval is preferably 1 hour, in other embodiments, in order to make judged result more accurate, can this prefixed time interval of proper extension.
The present embodiment after system stability, again starts to carry out refrigerant disappearance and judges, reduce because carry out detecting the erroneous judgement caused when air-conditioning system does not reach stable, improve the accuracy that refrigerant disappearance detects further after air-conditioner shutdown being detected.
With reference to shown in Fig. 3, the first embodiment based on air-conditioner coolant disappearance detection method of the present invention proposes the 4th embodiment of air-conditioner coolant of the present invention disappearance detection method.In the present embodiment, step S30 comprises following refinement step:
Step S31, when described first temperature difference is less than the first preset temperature difference, closes the compressor of described air-conditioner, restarts described compressor after the 3rd preset duration;
Step S32, continue the step performing the first temperature difference obtaining described indoor heat exchanger Current Temperatures and described initial temperature, until be consecutively detected the number of times that described first temperature difference is less than the first preset temperature difference to be more than or equal to preset times, control described air-conditioner and run according to the refrigerating operaton parameter preset.
In order to avoid the judged result because of cause influence refrigerant disappearances such as compressor fault or compressor behavior instability, when the first temperature difference is less than the first preset temperature difference, close compressor, restart after Preset Time, such as close after 3 minutes and restart again, again obtain the first temperature difference of indoor heat exchanger Current Temperatures and initial temperature, until the first temperature difference that continuously preset times time gets to be less than the first preset temperature poor, preset times is preferably 2-5 time, pre-judgement air-conditioner coolant disappearance, control air-conditioner and run the second preset duration according to the refrigerating operaton parameter preset, to detect further.
Further, step S32 comprises following refinement step:
Obtain outdoor environment temperature, when the described outdoor environment temperature got is less than the first preset temperature, controls described air-conditioner and run the second preset duration according to the first refrigerating operaton parameter preset;
When the described outdoor environment temperature got is more than or equal to the first preset temperature, control described air-conditioner and run the second preset duration according to the second refrigerating operaton parameter preset, wherein, described first refrigerating operaton parameter is greater than described second refrigerating operaton parameter.
Due to when outdoor environment temperature is too high, what compressor operating frequency, the isoparametric value of off-premises station motor speed are arranged is too high, the situation occurring overload of compressor can be caused, and then affect the stability of whole air-conditioning system, cause each temperature spot detected may be abnormal temperature, and the nominal parameter that air-conditioner nameplate indicates is when working under air-conditioner normal operative condition, the parameter value allowed.Therefore, according to outdoor temperature environment temperature, different operational factors is set, when outdoor environment temperature is less than the first preset temperature, wherein, first preset temperature is preferably 33-37 DEG C, using specified refrigerating operaton parameter as the first refrigerating operaton parameter, control air-conditioner to run according to specified refrigerating operaton parameter, by compressor operating frequency, electronic expansion valve opening, the parameters such as off-premises station motor speed are all set to nominal parameter, when outdoor environment temperature is relatively high, when being more than or equal to the first preset temperature, operational factor that can be relatively little runs to avoid compressor behavior unstable, less compressor operating frequency is such as set, preferably, using the half value of specified refrigerating operaton parameter as the second refrigerating operaton parameter.
The present embodiment is by repeat switch compressor, the temperature difference of the relative initial temperature of repeated detection indoor heat exchanger Current Temperatures, judge whether refrigerant lacks according to the result of repeated detection, reduce the situation of the judged result waiting cause influence refrigerant disappearance because of compressor behavior instability, improve the accuracy that refrigerant disappearance detects; And the present embodiment controls air-conditioner according to outdoor environment difference further and runs according to different parameters, causes the impact on testing result with less outdoor environment temperature to the impact of compressor state, improves the accuracy that refrigerant disappearance detects further.
The present invention also proposes a kind of air-conditioner coolant disappearance checkout gear.
With reference to shown in Fig. 4, it is the high-level schematic functional block diagram of air-conditioner coolant disappearance checkout gear first embodiment of the present invention.
In this embodiment, this air-conditioner coolant disappearance checkout gear comprises:
Temperature detecting module 10, during for opening air-conditioner and running in a chiller mode, obtains the initial temperature of indoor heat exchanger;
Temperature detecting module 10, also for after described air-conditioner runs the first preset duration, obtains the first temperature difference of described indoor heat exchanger Current Temperatures and described initial temperature;
Existing air-conditioner is provided with ring temperature sensor and pipe temperature sensor on indoor set, ring temperature sensor is for detecting indoor environment temperature, pipe temperature sensor is for detecting indoor heat exchanger as evaporator temperature, and the temperature detection in the present embodiment is realized by said temperature sensor.
In order to improve the accuracy of testing result, when air-conditioner is opened, first carried out the preliminary judgement of refrigerant disappearance by the change of indoor heat exchanger own temperature.Wherein, the initial temperature of indoor heat exchanger is temperature when being also in closed condition before air-conditioner starts, owing to being engraved in work when pipe temperature sensor is, can after air-conditioner starts, temperature detecting module 10 obtains the indoor heat exchanger Current Temperatures started before Preset Time, such as start the temperature of last minute, herein can by pipe temperature sensor obtain temperature go forward side by side line item realize.After air-conditioner runs the first preset duration, temperature detecting module 10 obtains the first temperature difference of indoor heat exchanger Current Temperatures and initial temperature, and the first preset duration is preferably 5-10 minute.
Airconditioning control module 20, during for being less than the first preset temperature difference when described first temperature difference, control after described air-conditioner runs the second preset duration according to the refrigerating operaton parameter preset, to obtain the second temperature difference of the indoor heat exchanger Current Temperatures of current indoor environment temperature and described air-conditioner.
After air-conditioner runs the first preset duration, reach stable state.Temperature detecting module 10 obtains the first temperature difference of described indoor heat exchanger Current Temperatures and initial temperature, to judge whether the temperature of indoor heat exchanger declines larger, when refrigerant abundance, indoor heat exchanger normally works, refrigerant evaporation heat absorption in it, the temperature recorded in real time can decline fast, produces the larger temperature difference relative to initial temperature.When the temperature difference obtained is less than the first preset temperature difference, the first preset temperature is poor is preferably 2-5 DEG C, and preliminary judgement may be because refrigerant disappearance causes the decline of the temperature of indoor heat exchanger very little even substantially constant.
The present embodiment is in order to avoid air conditioner operation parameters and the different impact judged air-conditioner coolant disappearance of indoor environment temperature, certain time length is run at air-conditioner, after state reaches and stablizes, the detection of refrigerant disappearance is carried out according to the indoor environment temperature of Real-time Obtaining, it should be noted that, the present embodiment is only effective in cooling mode.
About the setting of the refrigerating operaton parameter preset, this parameter can be arranged by user.In the present embodiment, preferably using the specified cooling parameters of air-conditioner as the refrigerating operaton parameter preset, as according to optimum configurations such as specified compressor operating frequency, electronic expansion valve opening, off-premises station motor speeds, these parameters, according to the difference of air-conditioner model, nameplate all have sign.In other embodiments, also close to the specified cooling parameters of air-conditioner as the refrigerating operaton parameter preset, or can be arranged according to indoor and outdoor surroundings temperature by user.
Second preset duration is preferably 5-10 minute in the present embodiment, is to judge after air-conditioner runs a period of time again, reduces because indoor environment temperature does not also reach the stable impact caused testing result.
About the acquisition of the second temperature difference of the indoor heat exchanger Current Temperatures of indoor environment temperature and described air-conditioner, it can be real-time continual detection, also can be that separated in time obtains a temperature difference, such as, control after air-conditioner runs ten minutes according to specified refrigerating operaton parameter, at interval of the second temperature difference obtaining an indoor environment temperature and indoor heat exchanger Current Temperatures 5 seconds in airconditioning control module 20.
Refrigerant judge module 30, during for being less than the second preset temperature difference when described second temperature difference got, judges that described air-conditioner coolant lacks.
The refrigerant of air-conditioner is when abundance, the refrigeration of air-conditioner is good, indoor environment temperature can decline to some extent, and in the process of refrigerastion of air-conditioner, the indoor heat exchanger recorded, namely the temperature of evaporimeter can decline rapidly, and far below indoor environment temperature, makes to have larger temperature difference between indoor environment temperature and evaporator temperature.
And between the indoor environment temperature got and evaporator temperature temperature difference be less than second preset temperature difference time, preferably, the second preset temperature difference is 3-6 DEG C.Now, refrigerant judge module 20 judges that air-conditioner coolant lacks, and causes indoor environment temperature to decline very little, and evaporator temperature declines very little equally simultaneously, causes the temperature difference between them very little.When described second temperature difference got is more than or equal to the second preset temperature difference, refrigerant judge module 30 judges that air-conditioner coolant is sufficient.
The air-conditioner coolant disappearance checkout gear that the present embodiment proposes, when judging whether air-conditioner lacks refrigerant, certain time length is run at air-conditioner, after its state reaches and stablizes, utilize the temperature difference between current indoor environment temperature and indoor heat exchanger Current Temperatures to judge, if the temperature difference is too small, judge refrigerant disappearance, decrease the impact that indoor environment temperature difference causes, improve the accuracy that refrigerant disappearance detects.
The first embodiment based on air-conditioner coolant disappearance checkout gear of the present invention proposes the second embodiment of air-conditioner coolant of the present invention disappearance checkout gear.In the present embodiment, refrigerant judge module 30, time also for being more than or equal to the second preset temperature difference when described second temperature difference, judges that described air-conditioner coolant is sufficient, continues to run described air-conditioner with described refrigeration mode.
When tentatively judging, if detect that indoor heat exchanger has the larger temperature difference to fall, refrigerant judge module 30 judges that air-conditioner coolant is sufficient, and the parameter that can arrange according to user continues operating air conditioner, judges no longer again.
Further, refrigerant judge module 30 also for:
When described second temperature difference got is less than the second preset temperature difference, the step of the second temperature difference of the indoor heat exchanger Current Temperatures obtaining indoor environment temperature and described air-conditioner is performed after Preset Time, until be consecutively detected the number of times that described second temperature difference is less than the second preset temperature difference to be greater than preset times, judge that described air-conditioner coolant lacks.By repeatedly obtaining temperature difference at interval of Preset Time, to improve the accuracy of detection.
Further, also comprise described in the detection of this air-conditioner coolant disappearance:
Information reporting module, for closing described air-conditioner, and reports the state that described air-conditioner coolant lacks.Such as, information reporting module can display reminding information on the display floater on air conditioner room unit, knows, carry out fault detect or add refrigerant for user; Or be connected if air-conditioner establishes with the terminal of user, information can be sent to terminal by information reporting module, to point out user.
Further, when described second temperature difference is more than or equal to the second preset temperature difference, judge that described air-conditioner coolant is sufficient, the described air-conditioner of normal operation.
With reference to shown in Fig. 5, the first embodiment based on air-conditioner coolant disappearance checkout gear of the present invention proposes the 3rd embodiment of air-conditioner coolant of the present invention disappearance checkout gear.In the present embodiment, temperature detecting module 10 comprises with lower unit:
Time acquisition unit 11, during for opening described air-conditioner and running in a chiller mode, obtains the time interval between the time point of described air-conditioner unlatching and last unused time point;
Temperature acquiring unit 12, for when described interval greater than prefixed time interval time, obtain the Current Temperatures of described indoor heat exchanger, and using the described Current Temperatures that the gets initial temperature as described indoor heat exchanger.
Due to air-conditioner after shutdown, the temperature of indoor heat exchanger can't lower immediately and reach normal temperature, and user may start air-conditioner in the short time after closedown air-conditioner once more, if at this time the temperature of indoor heat exchanger is still lower, even if now there is not the refrigerant disappearance that coolant leakage etc. causes, the indoor heat exchanger Current Temperatures recorded and the temperature difference of initial temperature also can be less, therefore, in order to improve the accuracy of judged result, when the stop and start of the air-conditioner that time acquisition unit 11 gets are interval greater than prefixed time interval, temperature acquiring unit 12 obtains the initial temperature of indoor heat exchanger, be preferably 1 hour, in other embodiments, in order to make judged result more accurate, can this prefixed time interval of proper extension.
The present embodiment after system stability, again starts and carries out the judgement of refrigerant disappearance, improve the accuracy that refrigerant disappearance detects further after air-conditioner shutdown being detected.
The first embodiment based on air-conditioner coolant disappearance checkout gear of the present invention proposes the 4th embodiment of air-conditioner coolant of the present invention disappearance checkout gear, in the present embodiment, airconditioning control module 30, time also for being less than the first preset temperature difference when described first temperature difference, close the compressor of described air-conditioner, after the 3rd preset duration, restart described compressor;
Temperature detecting module 10, time also for being less than the first preset temperature difference when described first temperature difference, obtain the first temperature difference of described indoor heat exchanger Current Temperatures and described initial temperature, until be consecutively detected the number of times that described first temperature difference is less than the first preset temperature difference to be more than or equal to preset times;
Airconditioning control module 30, when the number of times being also less than the first preset temperature difference for being consecutively detected described first temperature difference being more than or equal to preset times, controlling described air-conditioner and running according to the refrigerating operaton parameter preset.
In order to avoid the judged result because of cause influence refrigerant disappearances such as compressor fault or compressor behavior instability, when the first temperature difference is less than the first preset temperature difference, airconditioning control module 30 close compressor, restart after Preset Time, such as close after 3 minutes and restart again, temperature detecting module 10 obtains the first temperature difference of indoor heat exchanger Current Temperatures and initial temperature again, until the first temperature difference that continuously preset times time gets to be less than the first preset temperature poor, preset times is preferably 2-5 time, pre-judgement air-conditioner coolant disappearance, airconditioning control module 30 controls air-conditioner and runs the second preset duration according to the refrigerating operaton parameter preset, to detect further.
Further, airconditioning control module 30 comprises with lower unit:
Temperature acquiring unit, for obtaining outdoor environment temperature;
Conditioning control unit, during for being less than the first preset temperature when the described outdoor environment temperature got, controlling described air-conditioner and running the second preset duration according to the first refrigerating operaton parameter preset;
Described conditioning control unit, time also for being more than or equal to the first preset temperature when the described outdoor environment temperature got, control described air-conditioner and run the second preset duration according to the second refrigerating operaton parameter preset, wherein, described first refrigerating operaton parameter is greater than described second refrigerating operaton parameter.
Due to when outdoor environment temperature is too high, what compressor operating frequency, the isoparametric value of off-premises station motor speed are arranged is too high, the situation occurring overload of compressor can be caused, and then affect the stability of whole air-conditioning system, cause each temperature spot detected may be abnormal temperature, and the nominal parameter that air-conditioner nameplate indicates is when working under air-conditioner normal operative condition, the parameter value allowed.Therefore, the difference of the outdoor temperature environment temperature got according to outdoor temperature subelement arranges different operational factors, when outdoor environment temperature is less than the first preset temperature, wherein, first preset temperature is preferably 33-37 DEG C, airconditioning control subelement is using specified refrigerating operaton parameter as the first refrigerating operaton parameter, control air-conditioner to run according to specified refrigerating operaton parameter, by compressor operating frequency, electronic expansion valve opening, the parameters such as off-premises station motor speed are all set to nominal parameter, when outdoor environment temperature is relatively high, when being more than or equal to the first preset temperature, operational factor that can be relatively little runs to avoid compressor behavior unstable, less compressor operating frequency is such as set, preferably, using the half value of specified refrigerating operaton parameter as the second refrigerating operaton parameter.
The present embodiment is by repeat switch compressor, the temperature difference of the relative initial temperature of repeated detection indoor heat exchanger Current Temperatures, judge whether refrigerant lacks according to the result of repeated detection, reduce the situation of the judged result waiting cause influence refrigerant disappearance because of compressor behavior instability, improve the accuracy that refrigerant disappearance detects further; And the present embodiment controls air-conditioner according to outdoor environment difference further and runs according to different parameters, causes the impact on testing result with less outdoor environment temperature to the impact of compressor state, improves the accuracy that refrigerant disappearance detects further.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize description of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. an air-conditioner coolant disappearance detection method, is characterized in that, described air-conditioner coolant disappearance detection method comprises:
When opening air-conditioner and run in a chiller mode, obtain the initial temperature of indoor heat exchanger;
After described air-conditioner runs the first preset duration, obtain the first temperature difference of described indoor heat exchanger Current Temperatures and described initial temperature;
When described first temperature difference is less than the first preset temperature difference, control after described air-conditioner runs the second preset duration according to the refrigerating operaton parameter preset, to obtain the second temperature difference of the indoor heat exchanger Current Temperatures of current indoor environment temperature and described air-conditioner;
When described second temperature difference got is less than the second preset temperature difference, judge that described air-conditioner coolant lacks.
2. air-conditioner coolant disappearance detection method according to claim 1, it is characterized in that, it is described after described air-conditioner runs the first preset duration, after obtaining the step of the first temperature difference of described indoor heat exchanger Current Temperatures and described initial temperature, described air-conditioner coolant disappearance detection method also comprises:
When described second temperature difference is more than or equal to the second preset temperature difference, judges that described air-conditioner coolant is sufficient, continue to run described air-conditioner with described refrigeration mode.
3. air-conditioner coolant disappearance detection method according to claim 1, it is characterized in that, when the described air-conditioner of described unlatching also runs in a chiller mode, the step obtaining the initial temperature of described indoor heat exchanger comprises:
When opening described air-conditioner and run in a chiller mode, obtain the time interval between the time point of described air-conditioner unlatching and last unused time point;
When described interval greater than prefixed time interval time, obtain the Current Temperatures of described indoor heat exchanger, and using the described Current Temperatures that the gets initial temperature as described indoor heat exchanger.
4. air-conditioner coolant disappearance detection method according to claim 1, it is characterized in that, described when described first temperature difference is less than the first preset temperature difference, control the step that described air-conditioner runs the second preset duration according to the refrigerating operaton parameter preset and comprise:
When described first temperature difference is less than the first preset temperature difference, closes the compressor of described air-conditioner, after the 3rd preset duration, restart described compressor;
Continue the step performing the first temperature difference obtaining described indoor heat exchanger Current Temperatures and described initial temperature, until be consecutively detected the number of times that described first temperature difference is less than the first preset temperature difference to be more than or equal to preset times, control described air-conditioner and run the second preset duration according to the refrigerating operaton parameter preset.
5. air-conditioner coolant disappearance detection method according to claim 4, it is characterized in that, the step that the described air-conditioner of described control runs the second preset duration according to the refrigerating operaton parameter preset comprises:
Obtain outdoor environment temperature, when the described outdoor environment temperature got is less than the first preset temperature, controls described air-conditioner and run the second preset duration according to the first refrigerating operaton parameter preset;
When the described outdoor environment temperature got is more than or equal to the first preset temperature, control described air-conditioner and run the second preset duration according to the second refrigerating operaton parameter preset, wherein, described first refrigerating operaton parameter is greater than described second refrigerating operaton parameter.
6. an air-conditioner coolant disappearance checkout gear, is characterized in that, described air-conditioner coolant disappearance checkout gear comprises:
Temperature detecting module, during for opening described air-conditioner and running in a chiller mode, obtains the initial temperature of described indoor heat exchanger;
Described temperature detecting module, also for after described air-conditioner runs the first preset duration, obtains the first temperature difference of described indoor heat exchanger Current Temperatures and described initial temperature;
Airconditioning control module, during for being less than the first preset temperature difference when described first temperature difference, controlling described air-conditioner and runs the second preset duration according to the refrigerating operaton parameter preset;
Described temperature detecting module, also for after described air-conditioner runs the second preset duration according to the refrigerating operaton parameter preset, obtains the second temperature difference of the indoor heat exchanger Current Temperatures of current indoor environment temperature and described air-conditioner;
Refrigerant judge module, during for being less than the second preset temperature difference when described second temperature difference got, judges that described air-conditioner coolant lacks.
7. air-conditioner coolant disappearance checkout gear according to claim 6, it is characterized in that, described refrigerant judge module, time also for being more than or equal to the second preset temperature difference when described second temperature difference, judge that described air-conditioner coolant is sufficient, continue to run described air-conditioner with described refrigeration mode.
8. air-conditioner coolant disappearance checkout gear according to claim 6, it is characterized in that, described temperature detecting module comprises:
Time acquisition unit, during for opening described air-conditioner and running in a chiller mode, obtains the time interval between the time point of described air-conditioner unlatching and last unused time point;
Temperature detecting unit, for when described interval greater than prefixed time interval time, obtain the Current Temperatures of described indoor heat exchanger, and using the described Current Temperatures that the gets initial temperature as described indoor heat exchanger.
9. air-conditioner coolant disappearance checkout gear according to claim 6, it is characterized in that, described airconditioning control module, time also for being less than the first preset temperature difference when described first temperature difference, close the compressor of described air-conditioner, after the 3rd preset duration, restart described compressor;
Described second temperature difference module, time also for being less than the first preset temperature difference when described first temperature difference, obtains the first temperature difference of described indoor heat exchanger Current Temperatures and described initial temperature;
Described airconditioning control module, time also for being more than or equal to preset times at the number of times being consecutively detected described first temperature difference and being less than the first preset temperature difference, controlling described air-conditioner and running the second preset duration according to the refrigerating operaton parameter preset.
10. air-conditioner coolant disappearance checkout gear according to claim 9, it is characterized in that, described airconditioning control module comprises:
Temperature acquiring unit, for obtaining outdoor environment temperature;
Conditioning control unit, during for being less than the first preset temperature when the described outdoor environment temperature got, controlling described air-conditioner and running the second preset duration according to the first refrigerating operaton parameter preset;
Described conditioning control unit, time also for being more than or equal to the first preset temperature when the described outdoor environment temperature got, control described air-conditioner and run the second preset duration according to the second refrigerating operaton parameter preset, wherein, described first refrigerating operaton parameter is greater than described second refrigerating operaton parameter.
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