CN114234360A - Air conditioner and refrigerant leakage detection method thereof - Google Patents
Air conditioner and refrigerant leakage detection method thereof Download PDFInfo
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- CN114234360A CN114234360A CN202111322410.4A CN202111322410A CN114234360A CN 114234360 A CN114234360 A CN 114234360A CN 202111322410 A CN202111322410 A CN 202111322410A CN 114234360 A CN114234360 A CN 114234360A
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- 239000003507 refrigerant Substances 0.000 title claims abstract description 132
- 238000001514 detection method Methods 0.000 title claims abstract description 32
- 238000005057 refrigeration Methods 0.000 claims abstract description 33
- 238000005259 measurement Methods 0.000 claims abstract description 14
- 230000006835 compression Effects 0.000 claims abstract description 5
- 238000007906 compression Methods 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims description 17
- 238000004364 calculation method Methods 0.000 claims description 16
- 238000004088 simulation Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 14
- 238000004140 cleaning Methods 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 238000012360 testing method Methods 0.000 description 28
- 230000008859 change Effects 0.000 description 7
- 239000000428 dust Substances 0.000 description 6
- 230000008021 deposition Effects 0.000 description 5
- 230000006872 improvement Effects 0.000 description 5
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- 238000009833 condensation Methods 0.000 description 2
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- 238000012546 transfer Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/36—Responding to malfunctions or emergencies to leakage of heat-exchange fluid
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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
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention discloses an air conditioner, comprising: a refrigeration system that performs heat exchange between a refrigerant and indoor air in a compression refrigeration cycle; the current detection device is used for detecting the actual measurement current of the air conditioner during operation; and the control section is configured to: acquiring an actual measurement current value detected by the current detection device and a pre-stored reference current value corresponding to the current operation parameter of the air conditioner; the measured current value is an exhaust current value or a return current value of a compressor in the refrigeration system, and the first reference current value is a current value measured when the refrigerant meets a first proportion; and when the actually measured current value is smaller than or equal to the first reference current value, controlling the compressor to stop and sending prompt information of refrigerant leakage. The invention also discloses a refrigerant leakage detection method of the air conditioner. By adopting the embodiment of the invention, whether the refrigerant in the air conditioner leaks can be effectively detected, and the accuracy is high.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner and a refrigerant leakage detection method thereof.
Background
With the improvement of living standard of people, the popularization rate of air conditioners is higher and higher, and in the face of large-area popularization of air conditioners, the maintenance of the air conditioners is correspondingly frequent, various air conditioners are in the market, and a reasonable solution cannot be found for the problem of refrigerant leakage of the air conditioners all the time. For the situation of refrigerant leakage, most of the prior art adopts a leakage-proof pipeline valve interface and other modes to prevent the refrigerant leakage, but in the long-term use process of the air conditioner, due to environmental complexity, the welding or connecting part of the leakage-proof pipeline valve is still easy to damage the pipeline due to factors such as corrosion and the like, so that the phenomenon of refrigerant leakage of the air conditioner is caused. After the refrigerant leaks, the refrigerating and heating performances of the air conditioner are poor due to insufficient amount of the refrigerant, the comfort of a client is affected, the damage of key parts of the air conditioner is easy to occur, and for the air conditioner using the flammable and explosive refrigerant, if the refrigerant leaks, the refrigerant cannot be timely processed, so that the potential safety hazard is larger. In addition, when the refrigerant leakage occurs in the air conditioner, the amount of refrigerant in the refrigerating system is necessarily reduced, and because the amount of refrigerant is insufficient and the volume suction amount of the compressor is not changed, the power consumption of the compressor is reduced, the running current is reduced, and the changes are gradually obvious along with the increase of the refrigerant leakage amount.
Disclosure of Invention
The embodiment of the invention aims to provide an air conditioner and a refrigerant leakage detection method thereof, which can effectively detect whether the refrigerant in the air conditioner leaks or not and have high accuracy.
To achieve the above object, an embodiment of the present invention provides an air conditioner, including:
a refrigeration system that performs heat exchange between a refrigerant and indoor air in a compression refrigeration cycle;
the current detection device is used for detecting the actual measurement current of the air conditioner during operation; and the number of the first and second groups,
the control section is configured to:
acquiring an actual measurement current value detected by the current detection device and a pre-stored reference current value corresponding to the current operation parameter of the air conditioner; the measured current value is an exhaust current value or a return current value of a compressor in the refrigeration system, and the first reference current value is a current value measured when the refrigerant meets a first proportion;
and when the actually measured current value is smaller than or equal to the first reference current value, controlling the compressor to stop and sending prompt information of refrigerant leakage.
As a refinement of the above, the control section is further configured to:
acquiring a second reference current value corresponding to the current operating parameter of the air conditioner in advance; wherein the second reference current value is a current value measured when the refrigerant satisfies a second ratio, the second ratio being greater than the first ratio;
when the actually measured current value is greater than or equal to the second reference current value and smaller than the first reference current value, continuously calculating the ratio of the difference value of the second reference current value and the actually measured current value to the second reference current value at least twice at intervals of a preset time period;
and when at least two ratios obtained by continuous calculation meet the preset refrigerant leakage condition, sending out prompting information of refrigerant leakage.
As a modification of the above, the refrigerant leakage condition is that at least two ratios calculated successively decrease in sequence. .
As a refinement of the above, the control section is further configured to:
and when at least two ratios obtained by continuous calculation do not meet the preset refrigerant leakage condition, sending out prompt information for cleaning an evaporator or a condenser in the refrigeration system.
As an improvement of the above scheme, the first reference current value and the second reference current value are obtained by measuring in a pre-established air conditioner simulation model; the air conditioner simulation model is used for carrying out actual measurement in the refrigerating operation and the heating operation respectively and simulating the operation conditions of the air conditioner under different indoor working conditions, outdoor working conditions, fan speed and voltage.
As an improvement of the scheme, the interference current value is obtained by measuring in a pre-established air conditioner interference model; the shielding area of an evaporator or a condenser in the air conditioner interference model meets a plurality of preset shielding proportions, and the air conditioner interference model is actually measured in the refrigerating operation and the heating operation respectively and used for simulating the operation conditions of the air conditioner under different indoor working conditions, outdoor working conditions, fan speed and voltage.
In order to achieve the above object, an embodiment of the present invention further provides a refrigerant leakage detection method for an air conditioner, including:
acquiring a detected actual measurement current value of the air conditioner and a prestored reference current value corresponding to the current operating parameter of the air conditioner; the measured current value is an exhaust current value or an air return current value of a compressor in the air conditioner, and the first reference current value is a current value measured when the refrigerant meets a first proportion;
and when the actually measured current value is smaller than or equal to the first reference current value, controlling the compressor to stop and sending prompt information of refrigerant leakage.
As an improvement of the above, the method further comprises:
acquiring a second reference current value corresponding to the current operating parameter of the air conditioner in advance; wherein the second reference current value is a current value measured when the refrigerant satisfies a second ratio, the second ratio being greater than the first ratio;
when the actually measured current value is greater than or equal to the second reference current value and smaller than the first reference current value, continuously calculating the ratio of the difference value of the second reference current value and the actually measured current value to the second reference current value at least twice at intervals of a preset time period;
and when at least two ratios obtained by continuous calculation meet the preset refrigerant leakage condition, sending out prompting information of refrigerant leakage.
As a modification of the above, the refrigerant leakage condition is that at least two ratios calculated successively decrease in sequence.
As an improvement of the above, the method further comprises:
and when at least two ratios obtained by continuous calculation do not meet the preset refrigerant leakage condition, sending out prompt information for cleaning an evaporator in the air conditioner.
Compared with the prior art, according to the air conditioner and the refrigerant leakage detection method thereof, the current detection device is arranged at the air outlet or the air return port of the compressor in the refrigeration system of the air conditioner, so that the flow rate of the refrigerant flowing into the compressor is changed when the refrigerant leaks, and the deviation between the measured current value detected by the current detection device and the reference current value when the refrigerant does not leak is caused. Therefore, by comparing the reference current value and the measured current value under the same operation parameter of the air conditioner, whether the deviation is caused by the refrigerant leakage can be accurately judged, whether the refrigerant in the air conditioner leaks can be effectively detected, and the detection coverage is complete and high in accuracy.
Drawings
Fig. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention;
fig. 2 is a flowchart of a refrigerant leakage detecting method of an air conditioner according to an embodiment of the present invention;
fig. 3 is a flowchart of another refrigerant leakage detecting method for an air conditioner according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The air conditioner performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged. The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process. The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit. The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention, where the air conditioner includes:
a refrigeration system 10 that performs heat exchange between a refrigerant and indoor air in a compression refrigeration cycle;
the current detection device 20 is used for detecting the measured current of the air conditioner during operation; and the number of the first and second groups,
the control section 30 is configured to:
acquiring an actually measured current value detected by the current detection device 20 and a pre-stored reference current value corresponding to the current operating parameter of the air conditioner; wherein the measured current value is an exhaust current value or a return current value of a compressor in the refrigeration system 10, and the first reference current value is a current value measured when the refrigerant meets a first proportion;
and when the actually measured current value is smaller than or equal to the first reference current value, controlling the compressor to stop and sending prompt information of refrigerant leakage.
For example, after the air conditioner is stably operated, for example, 20 minutes after the air conditioner is started, and the refrigeration system 10 is stabilized, the control portion 30 obtains the measured current value. When the actually measured current value is the exhaust current value, the reference current value is also the exhaust current value; when the measured current value is the air return current value, the reference current value is also the air return current value. The first ratio is 90%, that is, the content of the refrigerant is 100%, but the first reference current value is a current value measured when the content of the refrigerant is 90%. After the actually measured current value of the air conditioner is obtained, the first reference current value corresponding to the current operation parameters of the air conditioner is obtained from a database in advance, if the actually measured current value is smaller than the first reference current value, the fact that the content of the refrigerant is reduced at the moment is shown, the situation of refrigerant leakage occurs, the situation is urgent, the compressor needs to be controlled to stop immediately, prompt information of the refrigerant leakage is sent, and the maintenance is needed immediately.
In addition, because the air conditioner is in different operation parameters (such as outdoor operating conditions, indoor operating conditions, set temperature, fan speed, voltage and the like under the refrigeration operating conditions), the values of the real-time current values are different, so that in the laboratory test, the different parameters need to be respectively sampled and tested to obtain a first reference current value under the corresponding operation parameter, and the first reference current value is compared with the actual current value.
Optionally, the prompt information includes at least one of a voice prompt, a text prompt and a display prompt, the voice prompt is sent by a voice device in the air conditioner, the text prompt is sent to the user client by a communication module in the air conditioner, and the display prompt is sent by a display screen in the air conditioner.
Optionally, the first reference current value and the second reference current value are obtained by measuring in a pre-established air conditioner simulation model; the air conditioner simulation model is used for carrying out actual measurement in the refrigerating operation and the heating operation respectively and simulating the operation conditions of the air conditioner under different indoor working conditions, outdoor working conditions, fan speed and voltage.
Illustratively, the leakage of refrigerant affects the variation of a number of operating parameters, with the operating current parameter being one of the most directly indicative of the variation. The refrigerant of the air conditioner leaks, the running power and the current of the refrigerating system can directly react, and the running power and the current of the refrigerating system can be reduced as long as the refrigerant leaks no matter under the refrigerating or heating working conditions. By testing the operating current parameters of the air conditioner at different leakage positions and different average leakage rates and comparing the operating parameter data of the normal working condition and the leakage working condition of the system, the rule of the change of the current value of the refrigeration system after the leakage of the refrigerant occurs can be easily identified.
In a laboratory, an air conditioner simulation model is built by combining the use environment of an air conditioner under the working conditions of refrigerating operation and heating operation respectively. Meanwhile, 4 leakage points are selected and are respectively called X1, X2, X3 and X4. Wherein the X1 leak is between the compressor to the condenser inlet, the X2 leak is between the condenser outlet to the throttle, the X3 leak is between the throttle outlet to the evaporator inlet, and the X4 leak is between the evaporator outlet to the compressor.
The outdoor temperature is 22-54 ℃, each interval is 8 ℃ to form a test point, and 5 test points are taken in total; in a similar way, the indoor temperature is from 20 ℃ to 35 ℃, each test point is separated by 5 ℃, and 4 test points are taken; in addition, the set temperature is 16 ℃, the set wind speed is 50%, 75% and 100% of the maximum wind volume of the actual operation condition of the air conditioner, and 3 test points are taken. Sampling every 25% from 187V to 253V, and taking 5 test points in total; respectively testing the selected 4 leakage points, wherein each leakage point is subjected to sampling testing by 100%, 95%, 90%, 85% and 80% of the actual refrigerant quantity, and the total number of the leakage points is 20; therefore, the indoor working condition, the outdoor working condition, the air volume, the voltage and the like form the actual operating working condition of the air conditioner, and the total number of the operating working condition points is 5 × 4 × 3 × 5 × 20 — 6000. The operating current values of the working condition points are respectively tested, and the total number of the collected data points is 6000. The operating current values of these operating points were measured separately for a total of 6000 collected data points. Through data research and analysis, the operating current is found to be one of the parameters which can most directly reflect the change of the system after the refrigerant of the system leaks. In addition, after the refrigerant leakage exceeds 10%, the operation current value of the whole system has a large difference value change. Similarly, under the heating condition, the corresponding test also has the identical rule.
Further, in the embodiment of the present invention, the influence of the interference factor of the air conditioner on the current detection is also considered, in this case, the control unit 30 is further configured to:
acquiring a second reference current value corresponding to the current operating parameter of the air conditioner in advance; wherein the second reference current value is a current value measured when the refrigerant satisfies a second ratio, the second ratio being greater than the first ratio;
when the actually measured current value is greater than or equal to the second reference current value and smaller than the first reference current value, continuously calculating the ratio of the difference value of the second reference current value and the actually measured current value to the second reference current value at least twice at intervals of a preset time period;
and when at least two ratios obtained by continuous calculation meet the preset refrigerant leakage condition, sending out prompting information of refrigerant leakage.
Specifically, the air conditioner is in the middle of user's in-service use, because the restriction of mounted position, can have some product amount of wind to receive the influence, in addition, because do not clean for a long time, can have the dirty, the deposition's of evaporimeter and condenser condition to the live time is too long, can have evaporimeter and condenser heat transfer ability decay. These factors affect the use effect of the air conditioner on one hand, and can affect the relevant operating parameters of the air conditioner on the other hand, and affect the accurate judgment of the leakage of the refrigerant of the air conditioner. No matter the refrigeration or heating working condition, as long as the refrigerant leaks, the operation power of the refrigeration system can be reduced, and the operation current can be reduced. Under the working condition of refrigeration, the indoor evaporator is dirty and deposited with dust, and the operation current is reduced similarly to the reduction of indoor air volume, and is consistent with the operation current change trend after the refrigerant leaks. Under the condition of heating, the outdoor condenser is dirty and deposited with dust, and the operation electricity is reduced similarly to the reduction of outdoor air volume, and the operation electricity is consistent with the operation current change trend after the refrigerant leaks. Although the influence value of the interference factor on the operating current does not directly participate in the judging step, the influence is fully considered when the current data simulation model is established, and the current operating trend change is adopted in the judging step, so that the method is more accurate in implementation.
In order to avoid the influence of the reduction of the operating current of the evaporator and the condenser caused by dirt and dust deposition on the detection result, the interference current value when the evaporator or the condenser meets the specific condition needs to be evaluated, wherein the specific condition is that the shielding area of the evaporator or the condenser meets a preset shielding proportion, such as 30%. It can be understood that, during the test, in order to better simulate the actual operation of the air conditioner, the evaporator or the condenser is shielded to different degrees, such as 20%, 30%, 50% and 80%, so as to simulate the situation that the air volume of the evaporator is reduced due to different degrees of dirt and dust deposition in the actual situation.
Optionally, the second proportion is 95%. The refrigerant leakage condition is that at least two ratios obtained by continuous calculation are sequentially decreased.
For example, when the measured current value is greater than or equal to the second reference current value and less than the first reference current value, the ratio of the difference between the second reference current value and the measured current value to the second reference current value is calculated at least twice every 30 minutes, for example, the calculated ratio is calculated three times in total, the ratio calculated for the first time is F1, the ratio calculated after 30 minutes is F2, the ratio calculated after 30 minutes is F3, if F1> F2> F3, when refrigerant leaks, the value obtained after each calculation is small, and the value is continuously detected three times for evaluation, so as to send out prompting information of refrigerant leakage. When at least two ratios obtained by continuous calculation do not meet the preset refrigerant leakage condition, possibly because the current detection result of the evaporator or the condenser is wrong due to dust deposition, a prompt message for cleaning the evaporator or the condenser in the refrigeration system is sent.
Optionally, the first reference current value and the second reference current value are obtained by measuring in a pre-established air conditioner simulation model; the air conditioner simulation model is used for carrying out actual measurement in the refrigerating operation and the heating operation respectively and simulating the operation conditions of the air conditioner under different indoor working conditions, outdoor working conditions, fan speed and voltage.
Illustratively, in a laboratory, an air conditioner interference model is built by combining the use environment of an air conditioner under the working conditions of refrigerating operation and heating operation respectively. Meanwhile, the operability of the test is considered, and in the process of carrying out different test tests, the test is carried out by shielding the evaporator or the condenser and is used as an interference test of the leakage fault of the refrigerant.
In a laboratory, under the refrigeration working condition, in combination with the use environment of an air conditioner, the outdoor temperature is 22-54 ℃, each interval is 8 ℃ to form a test point, and 5 test points are taken in total; in a similar way, the indoor temperature is from 20 ℃ to 35 ℃, each test point is separated by 5 ℃, and 4 test points are taken; in addition, the set temperature is 16 ℃, the set wind speed is 50%, 75% and 100% of the maximum wind volume of the actual operation condition of the air conditioner, and 3 test points are taken. Sampling every 25% from 187V to 253V, and taking 5 test points in total; and respectively selecting 20%, 50% and 80% of the shielded evaporators for testing, and taking 3 test points in total. Therefore, the indoor working condition, the outdoor working condition and the air volume form an actual operating working condition of the air conditioner, 5 × 4 × 3 × 5 × 3 × 900 test working condition points are counted, the operating current values of the working condition points are respectively tested, and through data research and analysis, the operating current value is one of parameters which can directly reflect the change of the refrigeration system relatively after the evaporator is shielded. In addition, the shielded evaporator has little influence on the running current initially, and the influence is increased as the shielded area is increased. Similarly, under the heating condition, the shielding condenser has a matched rule through corresponding tests. (Note that the refrigeration system will cause the relevant protection function action if the shielding area is too large.)
Based on the two groups of test conclusions, from the perspective of reverse recognition, a current data simulation model is established, the test work below is carried out according to 100%, 95% and 90% of the reference refrigerant amount respectively, then data are collated, and the current data simulation model is formed through fitting by an intelligent fuzzy algorithm.
Compared with the prior art, in the air conditioner provided by the embodiment of the invention, the current detection device is arranged at the air outlet or the air return port of the compressor in the refrigeration system of the air conditioner, so that the flow rate of the refrigerant flowing into the compressor is changed under the condition that the refrigerant leaks, and the deviation between the measured current value detected by the current detection device and the reference current value when the refrigerant does not leak is caused. Therefore, by comparing the reference current value and the measured current value under the same operation parameter of the air conditioner, whether the deviation is caused by the refrigerant leakage can be accurately judged, whether the refrigerant in the air conditioner leaks can be effectively detected, and the detection coverage is complete and high in accuracy.
Referring to fig. 2, fig. 2 is a flowchart of a refrigerant leakage detection method of an air conditioner according to an embodiment of the present invention, the refrigerant leakage detection method of the air conditioner including:
s1, acquiring a detected actually measured current value of the air conditioner and a prestored reference current value corresponding to the current operating parameter of the air conditioner; the measured current value is an exhaust current value or an air return current value of a compressor in the air conditioner, and the first reference current value is a current value measured when the refrigerant meets a first proportion;
when the measured current value is less than or equal to the first reference current value, the compressor is controlled to stop, and prompt information of refrigerant leakage is sent
For example, the measured current value is obtained after the air conditioner is stably operated, for example, 20 minutes after the air conditioner is started and the refrigeration system is stabilized. When the actually measured current value is the exhaust current value, the reference current value is also the exhaust current value; when the measured current value is the air return current value, the reference current value is also the air return current value. The first ratio is 90%, that is, the content of the refrigerant is 100%, but the first reference current value is a current value measured when the content of the refrigerant is 90%. After the actually measured current value of the air conditioner is obtained, the first reference current value corresponding to the current operation parameters of the air conditioner is obtained from a database in advance, if the actually measured current value is smaller than the first reference current value, the fact that the content of the refrigerant is reduced at the moment is shown, the situation of refrigerant leakage occurs, the situation is urgent, the compressor needs to be controlled to stop immediately, prompt information of the refrigerant leakage is sent, and the maintenance is needed immediately.
In addition, because the air conditioner is in different operation parameters (such as outdoor operating conditions, indoor operating conditions, set temperature, fan speed, voltage and the like under the refrigeration operating conditions), the values of the real-time current values are different, so that in the laboratory test, the different parameters need to be respectively sampled and tested to obtain a first reference current value under the corresponding operation parameter, and the first reference current value is compared with the actual current value.
Optionally, the prompt information includes at least one of a voice prompt, a text prompt and a display prompt, the voice prompt is sent by a voice device in the air conditioner, the text prompt is sent to the user client by a communication module in the air conditioner, and the display prompt is sent by a display screen in the air conditioner.
Optionally, the first reference current value and the second reference current value are obtained by measuring in a pre-established air conditioner simulation model; the air conditioner simulation model is used for carrying out actual measurement in the refrigerating operation and the heating operation respectively and simulating the operation conditions of the air conditioner under different indoor working conditions, outdoor working conditions, fan speed and voltage.
Further, in the embodiment of the present invention, an influence of an interference factor of the air conditioner on current detection is also considered, and referring to fig. 3, the method for detecting refrigerant leakage of an air conditioner further includes:
s3, acquiring a second reference current value corresponding to the current operation parameter of the air conditioner in advance; wherein the second reference current value is a current value measured when the refrigerant satisfies a second ratio, the second ratio being greater than the first ratio;
s4, when the measured current value is larger than or equal to the second reference current value and smaller than the first reference current value, continuously calculating the ratio of the difference value of the second reference current value and the measured current value to the second reference current value at least twice at intervals of a preset time period;
and S5, when at least two ratios obtained by continuous calculation meet the preset refrigerant leakage condition, sending out prompting information of refrigerant leakage.
Optionally, the second proportion is 95%. The refrigerant leakage condition is that at least two ratios obtained by continuous calculation are sequentially decreased.
For example, when the measured current value is greater than or equal to the second reference current value and less than the first reference current value, the ratio of the difference between the second reference current value and the measured current value to the second reference current value is calculated at least twice every 30 minutes, for example, the calculated ratio is calculated three times in total, the ratio calculated for the first time is F1, the ratio calculated after 30 minutes is F2, the ratio calculated after 30 minutes is F3, if F1> F2> F3, when refrigerant leaks, the value obtained after each calculation is small, and the value is continuously detected three times for evaluation, so as to send out prompting information of refrigerant leakage. When at least two ratios obtained by continuous calculation do not meet the preset refrigerant leakage condition, possibly because the current detection result of the evaporator or the condenser is wrong due to dust deposition, a prompt message for cleaning the evaporator or the condenser in the refrigeration system is sent.
Optionally, the first reference current value and the second reference current value are obtained by measuring in a pre-established air conditioner simulation model; the air conditioner simulation model is used for carrying out actual measurement in the refrigerating operation and the heating operation respectively and simulating the operation conditions of the air conditioner under different indoor working conditions, outdoor working conditions, fan speed and voltage.
Compared with the prior art, in the refrigerant leakage detection method of the air conditioner, according to the embodiment of the invention, the current detection device is arranged at the air outlet or the air return port of the compressor in the refrigeration system of the air conditioner, so that the flow rate of the refrigerant flowing into the compressor is changed when the refrigerant leaks, and the deviation between the measured current value detected by the current detection device and the reference current value when the refrigerant does not leak is caused. Therefore, the reference current value and the measured current value of the air conditioner under the same operation parameter are compared, whether the deviation caused by the refrigerant leakage exists can be accurately judged, whether the refrigerant in the air conditioner leaks can be effectively detected, the detection coverage is complete, and the accuracy is high.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. An air conditioner, comprising:
a refrigeration system that performs heat exchange between a refrigerant and indoor air in a compression refrigeration cycle;
the current detection device is used for detecting the actual measurement current of the air conditioner during operation; and the number of the first and second groups,
the control section is configured to:
acquiring an actual measurement current value detected by the current detection device and a pre-stored reference current value corresponding to the current operation parameter of the air conditioner; the measured current value is an exhaust current value or a return current value of a compressor in the refrigeration system, and the first reference current value is a current value measured when the refrigerant meets a first proportion;
and when the actually measured current value is smaller than or equal to the first reference current value, controlling the compressor to stop and sending prompt information of refrigerant leakage.
2. The air conditioner according to claim 1, wherein the control section is further configured to:
acquiring a second reference current value corresponding to the current operating parameter of the air conditioner in advance; wherein the second reference current value is a current value measured when the refrigerant satisfies a second ratio, the second ratio being greater than the first ratio;
when the actually measured current value is greater than or equal to the second reference current value and smaller than the first reference current value, continuously calculating the ratio of the difference value of the second reference current value and the actually measured current value to the second reference current value at least twice at intervals of a preset time period;
and when at least two ratios obtained by continuous calculation meet the preset refrigerant leakage condition, sending out prompting information of refrigerant leakage.
3. The air conditioner according to claim 2, wherein the refrigerant leakage condition is that at least two ratios calculated consecutively are sequentially decreased.
4. The air conditioner according to claim 2, wherein the control section is further configured to:
and when at least two ratios obtained by continuous calculation do not meet the preset refrigerant leakage condition, sending out prompt information for cleaning an evaporator or a condenser in the refrigeration system.
5. The air conditioner according to any one of claims 1 to 4, wherein the first reference current value and the second reference current value are measured in a pre-built air conditioner simulation model; the air conditioner simulation model is used for carrying out actual measurement in the refrigerating operation and the heating operation respectively and simulating the operation conditions of the air conditioner under different indoor working conditions, outdoor working conditions, fan speed and voltage.
6. The air conditioner according to claim 2, wherein the interference current value is measured in a pre-established air conditioner interference model; the shielding area of an evaporator or a condenser in the air conditioner interference model meets a plurality of preset shielding proportions, and the air conditioner interference model is actually measured in the refrigerating operation and the heating operation respectively and used for simulating the operation conditions of the air conditioner under different indoor working conditions, outdoor working conditions, fan speed and voltage.
7. A refrigerant leakage detecting method of an air conditioner, comprising:
acquiring a detected actual measurement current value of the air conditioner and a prestored reference current value corresponding to the current operating parameter of the air conditioner; the measured current value is an exhaust current value or an air return current value of a compressor in the air conditioner, and the first reference current value is a current value measured when the refrigerant meets a first proportion;
and when the actually measured current value is smaller than or equal to the first reference current value, controlling the compressor to stop and sending prompt information of refrigerant leakage.
8. The refrigerant leakage detecting method of an air conditioner according to claim 7, further comprising:
acquiring a second reference current value corresponding to the current operating parameter of the air conditioner in advance; wherein the second reference current value is a current value measured when the refrigerant satisfies a second ratio, the second ratio being greater than the first ratio;
when the actually measured current value is greater than or equal to the second reference current value and smaller than the first reference current value, continuously calculating the ratio of the difference value of the second reference current value and the actually measured current value to the second reference current value at least twice at intervals of a preset time period;
and when at least two ratios obtained by continuous calculation meet the preset refrigerant leakage condition, sending out prompting information of refrigerant leakage.
9. A refrigerant leakage detecting method of an air conditioner according to claim 8, wherein said refrigerant leakage condition is that at least two ratios calculated consecutively are sequentially decreased.
10. The refrigerant leakage detecting method of an air conditioner according to claim 8, further comprising:
and when at least two ratios obtained by continuous calculation do not meet the preset refrigerant leakage condition, sending out prompt information for cleaning an evaporator in the air conditioner.
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