CN117232101A - Refrigerant circulation abnormality detection method and air conditioner - Google Patents
Refrigerant circulation abnormality detection method and air conditioner Download PDFInfo
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- CN117232101A CN117232101A CN202311325139.9A CN202311325139A CN117232101A CN 117232101 A CN117232101 A CN 117232101A CN 202311325139 A CN202311325139 A CN 202311325139A CN 117232101 A CN117232101 A CN 117232101A
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- 239000003507 refrigerant Substances 0.000 title claims abstract description 144
- 230000005856 abnormality Effects 0.000 title claims abstract description 58
- 238000001514 detection method Methods 0.000 title claims abstract description 22
- 230000002159 abnormal effect Effects 0.000 claims abstract description 60
- 238000005070 sampling Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims description 32
- 230000008859 change Effects 0.000 claims description 6
- 238000004378 air conditioning Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
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- 238000012423 maintenance Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
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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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The application provides a refrigerant circulation abnormality detection method and an air conditioner, and relates to the technical field of air conditioners. The detection method is applied to the air conditioner and comprises the following steps: applied to an air conditioner, comprising: sampling the outdoor environment temperature at the starting time, the indoor environment temperature at the starting time, the inner tube temperature of the indoor heat exchange tube at the starting time, the current indoor inner ring environment temperature at the starting time, the operating frequency of the compressor, the indoor heat exchange tube temperature, the outdoor heat exchange tube temperature and the indoor current value, and transmitting sampling signals; detecting the running time of the air conditioner and outputting a judgment strategy signal; receiving a judged strategy signal, selecting a sampling signal according to the judging strategy signal, judging according to the sampling signal, and making an instruction of abnormal fault of refrigerant circulation; and receiving the instruction and controlling the air conditioner to stop protecting when the refrigerant circulation abnormality is met. The detection method can improve the reliability of detecting the refrigerant circulation abnormality.
Description
Technical Field
The application relates to the field of air conditioners, in particular to a refrigerant circulation abnormality detection method and an air conditioner.
Background
The air conditioner stop valve is an important component in an air conditioning system and has the main function of controlling the circulation of refrigerant in the air conditioning system so as to achieve the purposes of temperature adjustment and energy conservation. When the air conditioning system needs to refrigerate, the stop valve can be opened to enable the refrigerant to flow through the refrigerator and the evaporator, so that the indoor temperature is reduced. When the air conditioning system does not need to refrigerate, the stop valve can be closed to prevent the refrigerant from flowing out and air from flowing in.
However, at the time of after-sales installation, there often occurs a case where the closing valve is forgotten to be opened after the completion of the installation or the closing valve is forgotten to be opened after the operation. In the running process of the air conditioner, if the stop valve is closed, abnormal refrigerant circulation conditions can occur, and the normal running of the air conditioner is affected. The existing closing protection detection of the stop valve is to judge whether the stop valve is opened or not by using the same method in a fixed period of time, so that the reliability of judgment cannot be ensured.
Therefore, the reliability of the method for detecting the refrigerant circulation abnormality needs to be further improved.
Disclosure of Invention
In view of the above, an object of the present application is to provide a method for detecting a refrigerant circulation abnormality and an air conditioner, which are used for improving the problem of low reliability of the method for detecting a refrigerant circulation abnormality in the prior art.
The technical scheme adopted by the application for solving the technical problems is as follows:
in a first aspect, the present application provides a method for detecting abnormal refrigerant circulation, which is applied to an air conditioner, and includes:
sampling the outdoor environment temperature at the starting time, the indoor heat exchange tube temperature at the starting time, the current indoor environment temperature, the operating frequency of the compressor, the indoor heat exchange tube temperature, the outdoor heat exchange tube temperature and the indoor current value, and transmitting sampling signals;
detecting the running time of the air conditioner and outputting a judgment strategy signal;
receiving a judgment strategy signal, selecting a sampling signal according to the judgment strategy signal, judging according to the sampling signal, and making an instruction of abnormal fault of refrigerant circulation;
and receiving the instruction and controlling the air conditioner to stop protecting when the refrigerant circulation abnormality is met.
In some embodiments of the present application, detecting an air conditioner operation time, outputting a judgment policy signal includes: if the running time of the air conditioner is longer than a first preset time length, outputting a first judgment strategy signal; the first judgment policy signal includes:
judging whether the outdoor environment temperature at the starting time falls into a preset outdoor temperature range or not;
judging whether the indoor environment temperature at the starting time falls into a preset indoor temperature range or not;
judging whether the operation frequency of the compressor is larger than or equal to the preset operation frequency of the compressor;
if the outdoor environment temperature at the starting time, the indoor environment temperature at the starting time and the compressor running frequency all meet the conditions,
then judge at preset time t 1 Whether the temperature drop value delta T of the heat exchange tube at the outer side of the inner side is larger than or equal to a preset change temperature value and whether the operation frequency drop value of the compressor is smaller than or equal to 0;
the temperature drop value of the outdoor heat exchange tube and the running frequency drop value of the compressor meet the conditions,
then judge at preset time t 2 In the heat exchange device, whether the difference value between the temperature of the outdoor side heat exchange tube and the outdoor environment temperature is smaller than or equal to a first preset temperature difference value and lasts for a first preset time, and whether the indoor current value is smaller than or equal to a current preset value,
if the difference value between the temperature of the outdoor side heat exchange tube and the outdoor environment temperature, the duration time and the indoor current value meet the conditions, an instruction that the refrigerant circulation has abnormal faults is made.
In some embodiments of the application, the first decision strategy signal comprises:
if the outdoor environment temperature is less than or equal to 45 ℃ at the moment of starting up at 15 ℃, the indoor environment temperature is less than or equal to 45 ℃ at the moment of starting up at 15 ℃, and the running frequency of the compressor is more than or equal to 40Hz;
the temperature drop value DeltaT of the heat exchange tube at the outer side of the inner chamber within 1min is more than or equal to 3, and the running frequency drop value of the compressor is less than or equal to 0;
and (3) making a command that the refrigerant circulation has abnormal faults if the difference value between the temperature of the outdoor heat exchange tube and the outdoor environment temperature is less than or equal to 1.5 and lasts for 3min and the indoor current value is less than or equal to 1.5A.
In some embodiments of the present application, in the case of the first judgment policy signal, the air conditioner enters the refrigerant circulation cut-off protection when the refrigerant circulation is abnormal, including: and (3) shutting down the compressor, outputting refrigerant circulation abnormality information, starting the compressor after shutting down for a preset period of time, removing the refrigerant circulation abnormality information, recovering operation, and re-entering detection of refrigerant circulation abnormality.
In some embodiments of the present application, after detecting the abnormal re-entry refrigerant circulation, determining that the refrigerant circulation is abnormal at the preset time t 2 And if the difference value between the temperature of the outdoor side heat exchange tube and the outdoor environment temperature is smaller than or equal to the first preset temperature difference value, the continuous first preset time is not judged.
In some embodiments of the present application, detecting an air conditioner operation time, outputting a judgment policy signal includes: if the running time of the air conditioner is smaller than the first preset time length, outputting a second judgment strategy signal; the second judgment policy signal includes:
judging whether the outdoor environment temperature at the starting time falls into a preset outdoor temperature range or not;
judging whether the indoor environment temperature at the starting time falls into a preset indoor temperature range or not;
judging whether the operation frequency of the compressor is larger than or equal to the preset operation frequency of the compressor;
judging whether the absolute value of the difference between the indoor environment temperature at the starting time and the indoor heat exchange tube temperature at the starting time is smaller than or equal to a second preset temperature difference;
judging whether the difference value between the indoor environment temperature and the indoor side heat exchange tube temperature is smaller than or equal to a third preset temperature difference value;
if the outdoor environment temperature at the starting time, the indoor environment temperature at the starting time, the operating frequency of the compressor, the absolute value of the difference value of the indoor environment temperature at the starting time and the indoor heat exchange tube temperature at the starting time, and the difference value of the indoor environment temperature and the indoor heat exchange tube temperature all meet the conditions, an instruction that the refrigerant circulation has abnormal faults is given.
In some embodiments of the present application, if the air conditioner operation time is greater than the second preset time period and less than or equal to the first preset time period, the second judgment policy signal further includes: judging whether the difference value between the temperature of the indoor heat exchange tube and the minimum value of the temperature of the indoor heat exchange tube at the starting time is smaller than or equal to a fourth preset temperature difference value;
if the running time of the air conditioner is less than or equal to the second preset time length, the second judgment strategy signal further comprises: judging whether the difference value between the temperature of the indoor heat exchange tube at the starting time and the minimum value of the temperature of the indoor heat exchange tube at the inner side of the running time is smaller than or equal to a fifth preset temperature difference value.
In some embodiments of the present application, if the air conditioner operation time is greater than a second preset time period and less than or equal to the first preset time period, the second judgment policy signal includes: if the outdoor environment temperature is less than or equal to 45 ℃ at the moment of starting up at 15 ℃, the indoor environment temperature is less than or equal to 45 ℃ at the moment of starting up at 15 ℃, and the running frequency of the compressor is more than or equal to 40Hz; the absolute value of the difference between the indoor environment temperature at the starting time and the indoor heat exchange tube temperature at the starting time is less than or equal to 1.5 ℃, the difference between the indoor heat exchange tube temperature at the starting time and the minimum value of the indoor heat exchange tube temperature is less than or equal to 1.5 ℃, and then an instruction that the refrigerant circulation has abnormal faults is made;
if the running time of the air conditioner is greater than the second preset time length and less than or equal to the first preset time length, the second judgment strategy signal comprises: if the outdoor environment temperature is less than or equal to 45 ℃ at the moment of starting up at 15 ℃, the indoor environment temperature is less than or equal to 45 ℃ at the moment of starting up at 15 ℃, and the running frequency of the compressor is more than or equal to 40Hz; and when the absolute value of the difference between the indoor environment temperature at the starting time and the indoor heat exchange tube temperature at the starting time is less than or equal to 1.5 ℃, the difference between the indoor heat exchange tube temperature at the starting time and the minimum value of the indoor heat exchange tube temperature at the inner side of the operating time is less than or equal to 1.5 ℃, an instruction that the refrigerant circulation has abnormal faults is given.
In some embodiments of the present application, in the case of the second judgment policy signal, the air conditioner enters the refrigerant circulation cut-off protection when the refrigerant circulation is abnormal, including: shutting down the compressor, outputting refrigerant circulation abnormality information, starting the compressor after shutting down for a preset period of time, removing the refrigerant circulation abnormality information, recovering operation, and re-entering detection of refrigerant circulation abnormality; after the refrigerant circulation abnormality is detected again, whether the absolute value of the difference between the indoor environment temperature at the starting time and the indoor heat exchange tube temperature at the starting time is smaller than or equal to a second preset temperature difference is not judged.
In a second aspect, an embodiment of the present application further provides an air conditioner, where the air conditioner is configured to execute the method for detecting a refrigerant circulation abnormality.
In summary, due to the adoption of the technical scheme, the application at least comprises the following beneficial effects:
according to the method for detecting the refrigerant circulation abnormality, which is provided by the application, the state of the air conditioner indoor unit is different due to the fact that the compressor is powered on for a single time, different strategies are selected to detect the refrigerant circulation abnormality according to the operation time of the compressor, so that the refrigerant circulation abnormality can be detected at all scene moments, the detection reliability is improved, and the refrigerant circulation abnormality can be detected in time so as to take corresponding protection measures to protect the compressor and the air conditioner.
Drawings
For a clearer description of an embodiment of the application, reference will be made to the accompanying drawings of embodiments, which are given for clarity, wherein:
FIG. 1 is a schematic diagram of a refrigeration principle of an air conditioner in the prior art;
FIG. 2 is a flow chart of a method for detecting abnormal refrigerant circulation according to an embodiment of the present application;
FIG. 3 is a flowchart of a first determination strategy signal according to an embodiment of the present application;
FIG. 4 is a flowchart of a second judgment policy signal provided by an embodiment of the present application, where the second judgment policy signal is greater than a second preset duration and less than a first preset duration;
FIG. 5 is a flowchart of a third determination policy signal provided by an embodiment of the present application that is less than a second predetermined duration;
fig. 6 is a block diagram of a refrigerant circulation abnormality detection device according to an embodiment of the present application.
Reference numerals:
a first shutoff valve 101; a second shut-off valve 102; a compressor 20; a condenser 30; an outdoor fan 40; a throttle mechanism 50; an evaporator 60; an indoor fan 70;
a detecting device 100 for detecting abnormal refrigerant circulation; an acquisition module 110; a determination module 120; a control module 130.
Detailed Description
The technical solutions of the embodiments of the present application will be clearly and fully described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.
In the description of the present application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the application and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a unique orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or the inclusion of a number of indicated features. Thus, a feature defining "a first" or "a second" may include one or more features, either explicitly or implicitly. In the description of the present application, the meaning of "a plurality" is two or more unless explicitly defined otherwise.
In the present application, the term "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described as "exemplary" in this disclosure is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, details are set forth for purposes of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes have not been described in detail so as not to obscure the description of the application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles disclosed herein.
To facilitate an understanding of the solution of the application, spline curves and arrows used for reference numerals in the drawings are described herein: the parts indicated for the spline without arrow are solid parts, i.e. parts with solid structure; the parts indicated for the spline with arrow are virtual parts, i.e. parts without solid structure.
In order to facilitate understanding of the technical solution of the present application, the related art related to the technical solution of the present application will be described. Referring to fig. 1, the air conditioner performs cooling by a compressor 20, which includes: the low-temperature low-pressure gaseous refrigerant enters the compressor 20 through the first stop valve 101 of the compressor 20, is compressed by the compressor 20 and becomes high-temperature high-pressure gaseous refrigerant, the high-temperature high-pressure gaseous refrigerant flows to the condenser 30 through the second stop valve 102 to be cooled, the low-temperature high-pressure liquid refrigerant is liquefied in the condenser 30, heat generated by the liquefaction is discharged to the outside along with the outdoor fan 40, the low-temperature high-pressure liquid refrigerant is depressurized through the throttling mechanism 50 and becomes low-temperature low-pressure liquid refrigerant easy to evaporate, the low-temperature low-pressure liquid refrigerant flows to the evaporator in the room, the evaporator absorbs the heat in the air to evaporate and evaporate, the ambient temperature is reduced, the air is blown into the room along with the indoor fan 70, the effect of reducing the room temperature is achieved, and meanwhile, the gaseous refrigerant evaporated by the evaporator 60 enters the compressor 20 through the first stop valve 101 of the compressor 20 again to be reciprocally circulated. That is, when the air conditioner normally performs the cooling mode, both the first shut-off valve 101 and the second shut-off valve 102 are in an open state. When either the first stop valve 101 or the second stop valve 102 is closed, abnormal refrigerant circulation is caused, so that not only effective cooling cannot be realized, but also the temperature of the compressor 20 is too high, and the compressor 20 is damaged.
Referring to fig. 2, an embodiment of the present application provides a method for detecting abnormal refrigerant circulation, which is applied to an air conditioner. The method for detecting the refrigerant circulation abnormality comprises the following steps:
s11, sampling the outdoor environment temperature at the starting time, the indoor heat exchange tube temperature at the starting time, the current indoor environment temperature, the compressor operating frequency, the indoor heat exchange tube temperature, the outdoor heat exchange tube temperature and the indoor current value, and transmitting a sampling signal.
S12, detecting the running time of the air conditioner and outputting a judgment strategy signal.
S13, receiving a judgment strategy signal, selecting a sampling signal according to the judgment strategy signal, judging according to the sampling signal, and making an instruction that the refrigerant circulation has abnormal faults.
S14, receiving the instruction and controlling the air conditioner to stop protecting when the refrigerant circulation abnormality is met.
It can be understood that by timely protecting after determining that the refrigerant circulation has abnormal faults, the reliability and stability of the operation of the air conditioner can be improved, and the user experience is better.
In some embodiments, referring to fig. 3, detecting the air conditioner operation time, outputting the judgment policy signal includes: if the running time of the air conditioner is longer than a first preset time length, outputting a first judgment strategy signal; the first judgment policy signal includes:
s111a, judging whether the outdoor environment temperature at the starting moment falls into a preset outdoor temperature range;
s111b, judging whether the indoor environment temperature at the starting moment falls into a preset indoor temperature range;
s111c, judging whether the operation frequency of the compressor is larger than or equal to the preset operation frequency of the compressor;
if the outdoor environment temperature at the starting time, the indoor environment temperature at the starting time and the compressor running frequency all meet the conditions,
s112a, judging that the preset time t is reached 1 Whether the temperature drop value delta T of the heat exchange tube at the inner side and the outer side is larger than or equal to a preset change temperature value or not;
s112b, judging whether the operation frequency reduction value of the compressor is smaller than or equal to 0;
the temperature drop value of the outdoor heat exchange tube and the running frequency drop value of the compressor meet the conditions,
s113a, judging that the preset time t is reached 2 Whether the difference value between the temperature of the heat exchange tube at the outer side and the temperature of the outdoor environment is smaller than or equal to a first preset temperature difference value or not and lasts for a first preset time;
s113b, whether the indoor current value is less than or equal to a current preset value,
s114, if the difference value between the temperature of the outdoor side heat exchange tube and the outdoor environment temperature, the duration time and the indoor current value meet the conditions, an instruction that the refrigerant circulation has abnormal faults is made.
It will be understood that the judgment in S112a and S112b is based on the normal circulation of the refrigerant during the normal operation of the air conditioner, the compressor normally compresses, the temperature of the outdoor heat exchange tube does not change significantly, and when the operating frequency of the compressor does not change significantly and the temperature of the outdoor heat exchange tube drops sharply, the abnormality of the outdoor heat exchange tube is illustrated. It is necessary to further determine whether or not the refrigerant circulation abnormality is confirmed.
The judgment of S113a and S113b is performed within 360S after the conditions of S112a and S112b are satisfied, that is, after the conditions of S112a and S112b are satisfied, if the conditions of S113a and S113b are not satisfied within 360S, the judgment of S112a and S112b is repeated, and if the conditions of S113a and S113b are satisfied within 360S, an instruction is given that the refrigerant cycle has an abnormal failure.
In some embodiments, the first preset duration is 300s, where s is a unit of time: second. I.e. the above-mentioned judging method is applicable to 300s, ++ infinity ]. It is understood that various indexes of the air conditioner, such as indoor temperature, outdoor temperature, compressor frequency, etc., gradually become stable after the compressor starts to operate for 300 s. The first judgment strategy signal is a detection strategy for the circulation condition of the refrigerant which is applied after 300S from the moment when the compressor starts to operate.
Specifically, in some embodiments, the first decision strategy signal comprises:
if the outdoor environment temperature is less than or equal to 45 ℃ at the starting time and is less than or equal to 15 ℃, the indoor environment temperature is less than or equal to 45 ℃ at the starting time and is less than or equal to 15 ℃, and the running frequency of the compressor is more than or equal to 40Hz;
the temperature drop value DeltaT of the outdoor side heat exchange tube within 1min is more than or equal to 3, and the operating frequency drop value of the compressor is less than or equal to 0;
and if the difference value between the temperature of the outdoor side heat exchange tube and the outdoor environment temperature is less than or equal to 1.5 and the indoor current value is less than or equal to 1.5A, making a command that the refrigerant circulation has abnormal faults.
The judgment of S111a and S111b indicates that the air conditioner is in a harsher environment when running in the environment with the temperature above 45 ℃ or below 15 ℃ and is easy to influence the normal running of the air conditioner, so that the outdoor environment temperature at the starting time of 15 ℃ is less than or equal to 45 ℃ and the indoor environment temperature at the starting time of 15 ℃ is less than or equal to 45 ℃ are required to be met, the air conditioner is determined to be in the normal environment, and then whether the stop valve is closed or not is detected, namely, the refrigerant circulation condition is detected.
Accordingly, if the above condition is not satisfied, the air conditioner maintains the current state operation.
In some embodiments, under the condition of the first judgment policy signal, the air conditioner enters the refrigerant circulation cut-off protection when the refrigerant circulation is abnormal, including: and (5) shutting down the compressor and outputting abnormal information of refrigerant circulation.
It will be appreciated that shutting down the compressor may restore the indoor unit to a normal state, avoiding damage caused by excessive compressor temperatures.
The abnormal refrigerant circulation information can be output by adopting the conventional technical means in the field, such as voice control alarm, fault code display or sending to a preset client, so that a user can know the abnormal refrigerant circulation state in time and take maintenance measures in time, the humanization is better, and the reliability is better.
In some embodiments, after the shutdown is performed for a preset period of time, the method further includes starting the compressor, clearing abnormal refrigerant circulation information, resuming operation, and re-entering detection of abnormal refrigerant circulation. When the operation is resumed again, the time length is counted after the compressor is started.
In some embodiments, the preset time period may be 3min to 5min, for example, may be 3min, 3.5min, 4min, 4.5min, etc.
In some embodiments, after detecting the abnormal refrigerant circulation, the judging strategy signal may mostly refer to the first judging strategy signal, and only different judging conditions are described in detail below:
at a preset time t 2 And judging whether the difference value between the temperature of the outdoor side heat exchange tube and the outdoor environment temperature is smaller than or equal to a first preset temperature difference value or not, and judging whether the first preset time is continued or not. More specifically, the difference between the outdoor side heat exchange tube temperature and the outdoor ambient temperature was judged to be 1.5 or less, but it was not judged to last for 3 minutes any more.
If the refrigerant circulation is determined to be normal again, the current state is maintained to continue operation, and if the refrigerant circulation is determined to have abnormal faults again, namely, after the abnormal faults of the refrigerant circulation are determined continuously twice, the air conditioner is protected from the abnormal refrigerant circulation and is not restored to operation.
In some embodiments, referring to fig. 4 and 5, detecting the operation time of the air conditioner, outputting the judgment policy signal includes: if the running time of the air conditioner is smaller than the first preset time length, outputting a second judgment strategy signal; the second judgment policy signal includes:
s121 a, judging whether the outdoor environment temperature at the starting moment falls into a preset outdoor temperature range;
s121 b, judging whether the indoor environment temperature at the starting moment falls into a preset indoor temperature range;
s121 c, judging whether the operation frequency of the compressor is larger than or equal to the preset operation frequency of the compressor;
s121 d, judging whether the absolute value of the difference between the indoor environment temperature at the starting time and the indoor heat exchange tube temperature at the starting time is smaller than or equal to a second preset temperature difference;
s121 e, judging whether the difference value between the indoor environment temperature and the indoor side heat exchange tube temperature is smaller than or equal to a third preset temperature difference value;
s122, if the outdoor environment temperature at the starting time, the indoor environment temperature at the starting time, the operating frequency of the compressor, the absolute value of the difference value of the indoor environment temperature at the starting time and the indoor heat exchange tube temperature at the starting time, and the difference value of the indoor environment temperature and the indoor heat exchange tube temperature all meet the conditions, an instruction that the refrigerant circulation has abnormal faults is given.
In some embodiments, if the air conditioner operation time is greater than the second preset time period and less than or equal to the first preset time period, the second judgment policy signal further includes:
s121 f, judging whether the difference value between the temperature of the indoor heat exchange tube at the starting time and the minimum value of the temperature of the indoor heat exchange tube is smaller than or equal to a fourth preset temperature difference value.
Further, in some embodiments, if the air conditioner operation time is greater than a second preset time period and less than or equal to the first preset time period, the second judgment policy signal includes: if the outdoor environment temperature is less than or equal to 45 ℃ at the moment of starting up at 15 ℃, the indoor environment temperature is less than or equal to 45 ℃ at the moment of starting up at 15 ℃, and the running frequency of the compressor is more than or equal to 40Hz; and when the absolute value of the difference between the indoor environment temperature at the starting time and the indoor heat exchange tube temperature at the starting time is less than or equal to 1.5 ℃, the difference between the indoor heat exchange tube temperature at the starting time and the minimum value of the indoor heat exchange tube temperature is less than or equal to 1.5 ℃, an instruction that the refrigerant circulation has abnormal faults is made.
In some embodiments, the second predetermined time period is 90s, i.e., the above-mentioned judging method is applicable to (90 s,300 s).
In other embodiments, if the air conditioner operation time is less than or equal to a second preset duration, the second judgment policy signal further includes:
s121g, judging whether the difference value between the temperature of the indoor heat exchange tube at the starting time and the minimum value of the temperature of the indoor heat exchange tube at the running time is smaller than or equal to a fifth preset temperature difference value.
Further, in some embodiments, if the air conditioner operation time is greater than a second preset time period and less than or equal to the first preset time period, the second judgment policy signal includes: if the outdoor environment temperature is less than or equal to 45 ℃ at the moment of starting up at 15 ℃, the indoor environment temperature is less than or equal to 45 ℃ at the moment of starting up at 15 ℃, and the running frequency of the compressor is more than or equal to 40Hz; and when the absolute value of the difference between the indoor environment temperature at the starting time and the indoor heat exchange tube temperature at the starting time is less than or equal to 1.5 ℃, the difference between the indoor heat exchange tube temperature at the starting time and the minimum value of the indoor heat exchange tube temperature at the inner side of the operating time is less than or equal to 1.5 ℃, an instruction that the refrigerant circulation has abnormal faults is given.
In some embodiments, the second preset duration is 90s, that is, the above-mentioned judging method is applicable to (0 s,90 s).
The difference between the second preset time length and the time length from the second preset time length to the first preset time length is that the difference between the indoor heat exchange tube temperature at the starting time and the minimum value of the indoor heat exchange tube temperature at the inner side of the operating time length is less than or equal to 1.5 ℃ and the difference between the indoor heat exchange tube temperature at the starting time and the minimum value of the indoor heat exchange tube temperature at the starting time is less than or equal to 1.5 ℃. Because the temperature of the indoor heat exchange tube of the air conditioner changes rapidly within 90s, the difference between the temperature of the indoor heat exchange tube and the minimum value of the temperature of the indoor heat exchange tube at the starting time is required to be judged to be less than or equal to 1.5 ℃, and when the compressor operates for 90-300 s, the change rate of the temperature of the indoor heat exchange tube is reduced, and the real-time temperature of the indoor heat exchange tube can be adopted for judging.
In some embodiments, under the condition of the second judgment policy signal, the air conditioner enters the refrigerant circulation cut-off protection when the refrigerant circulation is abnormal, including: and (5) shutting down the compressor and outputting abnormal information of refrigerant circulation.
In some embodiments, after the shutdown is performed for a preset period of time, the method further includes starting the compressor, clearing abnormal refrigerant circulation information, resuming operation, and re-entering detection of abnormal refrigerant circulation.
In some embodiments, after detecting the abnormal refrigerant circulation, the judging strategy signal may mostly refer to the second judging strategy signal, and only different judging conditions are described in detail below:
and whether the absolute value of the difference between the indoor environment temperature at the starting time and the indoor heat exchange tube temperature at the starting time is smaller than or equal to a second preset temperature difference is not judged. More specifically, the absolute value of the difference between the indoor environment temperature at the starting time and the indoor heat exchange tube temperature at the starting time is not more than 1.5 ℃.
If the refrigerant circulation is determined to be normal again, the current state is maintained to continue operation, and if the refrigerant circulation is determined to have abnormal faults again, namely, after the abnormal faults of the refrigerant circulation are determined continuously twice, the air conditioner is protected from the abnormal refrigerant circulation and is not restored to operation.
It should be further noted that, the number of abnormal refrigerant circulation times determined in the second preset time period and the second preset time period to the first preset time period may be superimposed, for example, if the abnormal refrigerant circulation is determined in the second preset time period for the first time, and after the operation is resumed again, the abnormal refrigerant circulation is determined in the second preset time period to the third preset time period, that is, the abnormal refrigerant circulation is determined twice continuously. The number of refrigerant circulation anomalies determined outside the first preset time period is not overlapped with the number of refrigerant circulation anomalies determined in the first preset time period, for example, the refrigerant circulation anomalies are determined in the second preset time period for the first time, and the refrigerant circulation anomalies are determined outside the first preset time period after the operation is resumed again, so that the refrigerant circulation anomalies are not determined as two continuous determinations; for another example, the refrigerant circulation abnormality is determined for the first time outside the first preset time period, and the refrigerant circulation abnormality is determined for the second time period after the operation is resumed again, and the refrigerant circulation abnormality can be determined for two consecutive times.
It can be understood that the abnormal refrigerant circulation is continuously determined twice, which means that the air conditioner is difficult to restore to the normal operation state by itself, if the compressor is forced to restore to the operation by itself, the air conditioner may be damaged, and the air conditioner is required to restore to the normal operation by human intervention maintenance, thereby protecting the air conditioner and prolonging the service life of the air conditioner.
According to the method for detecting the refrigerant circulation abnormality, which is provided by the application, the state of the air conditioner indoor unit is different due to the fact that the compressor is powered on for a single time, different strategies are selected to detect the refrigerant circulation abnormality according to the operation time of the compressor, so that the refrigerant circulation abnormality can be detected at all scene moments, the detection reliability is improved, and the refrigerant circulation abnormality can be detected in time so as to take corresponding protection measures to protect the compressor and the air conditioner.
Accordingly, referring to fig. 6, an embodiment of the present application further provides a device 100 for detecting abnormal refrigerant circulation, including:
an obtaining module 110, configured to obtain an operation duration of the compressor after the indoor unit is powered on this time;
a determining module 120, configured to output a judgment policy signal according to the operation duration;
the control module 130 is configured to select a sampling signal according to the judgment policy signal, judge according to the sampling signal, and make an instruction that the refrigerant circulation has an abnormal fault; the control module 130 is further configured to control the air conditioner to perform shutdown protection when the refrigerant circulation is abnormal according to the instruction that the refrigerant circulation has an abnormal fault.
In some embodiments, the control module 130 controls the air conditioner to perform shutdown protection when the refrigerant circulation abnormality is satisfied, including: and the control module is used for shutting down the compressor and outputting the refrigerant circulation abnormality information when the refrigerant circulation abnormality is determined for the first time based on the determination module.
Further, the control module 130 is further configured to turn on the compressor after the first compressor is turned off for a preset period of time, clear abnormal information of refrigerant circulation, and resume operation.
In some embodiments, the acquisition module 110 is further configured to acquire a number of times the compressor is continuously shut down, and the control module 130 is configured to shut down the compressor and not resume operation based on the number of times the compressor is continuously shut down being greater than or equal to 2.
It can be understood that the refrigerant circulation abnormality detection device 100 provided by the present application corresponds to the refrigerant circulation abnormality detection method provided by the present application, and for brevity of description, the same or similar parts may refer to the content of the refrigerant circulation abnormality detection method part, and will not be described herein.
All or part of the modules in the refrigerant circulation abnormality detection device can be realized by software, hardware and a combination thereof. The above modules may be embedded in hardware or independent of a processor in a server, or may be stored in software in a memory in the server, so that the processor may call and execute operations corresponding to the above modules. The processor may be a Central Processing Unit (CPU), microprocessor, single-chip microcomputer, etc.
The method for detecting a refrigerant circulation abnormality and/or the apparatus 100 for detecting a refrigerant circulation abnormality may be implemented in the form of a computer readable instruction.
Correspondingly, the embodiment of the application also provides a system for detecting the refrigerant circulation abnormality, which comprises the following steps:
the first temperature sensor is used for acquiring outdoor environment temperature;
the second temperature sensor is used for acquiring indoor environment temperature;
the third temperature sensor is used for acquiring the temperature of the indoor heat exchange tube;
a fourth temperature sensor for acquiring the temperature of the outdoor heat exchange tube;
the compressor frequency detector is used for acquiring the operation frequency of the compressor;
the current tester is used for acquiring the current value of the indoor unit;
a memory storing computer readable instructions;
the controller comprises a storage unit and a processing unit, wherein the storage unit stores computer readable instructions; the processing unit is in signal connection with the first temperature sensor, the second temperature sensor, the third temperature sensor, the fourth temperature sensor, the compressor frequency detector, the current tester and the storage unit, and the processing unit is used for calling computer readable instructions to execute the method for detecting the refrigerant circulation abnormality.
The embodiment of the application also provides an air conditioner, which is used for executing the method for detecting the refrigerant circulation abnormality.
While the basic concepts have been described above, it will be apparent to those skilled in the art that the foregoing detailed disclosure is by way of example only and is not intended to be limiting. Although not explicitly described herein, various modifications, improvements and adaptations of the application may occur to one skilled in the art. Such modifications, improvements, and modifications are intended to be suggested within the present disclosure, and therefore, such modifications, improvements, and adaptations are intended to be within the spirit and scope of the exemplary embodiments of the present disclosure.
Claims (10)
1. The method for detecting the refrigerant circulation abnormality is characterized by being applied to an air conditioner and comprising the following steps of:
sampling the outdoor environment temperature at the starting time, the indoor heat exchange tube temperature at the starting time, the current indoor environment temperature, the operating frequency of the compressor, the indoor heat exchange tube temperature, the outdoor heat exchange tube temperature and the indoor current value, and transmitting sampling signals;
detecting the running time of the air conditioner and outputting a judgment strategy signal;
receiving a judgment strategy signal, selecting a sampling signal according to the judgment strategy signal, judging according to the sampling signal, and making an instruction of abnormal fault of refrigerant circulation;
and receiving an instruction and controlling the air conditioner to stop protecting when the refrigerant circulation abnormality is met.
2. The method according to claim 1, wherein detecting the operation time of the air conditioner and outputting a judgment policy signal includes: if the running time of the air conditioner is longer than a first preset time length, outputting a first judgment strategy signal; the first judgment policy signal includes:
judging whether the outdoor environment temperature at the starting time falls into a preset outdoor temperature range or not;
judging whether the indoor environment temperature at the starting time falls into a preset indoor temperature range or not;
judging whether the operation frequency of the compressor is larger than or equal to a preset operation frequency of the compressor;
if the outdoor ambient temperature at the starting time, the indoor ambient temperature at the starting time and the compressor operating frequency all meet the conditions,
then judge at preset time t 1 In the method, whether the temperature drop value delta T of the outdoor side heat exchange tube is larger than or equal to a preset change temperature value and whether the operating frequency drop value of the compressor is smaller than or equal to 0;
the temperature decrease value of the outdoor heat exchange tube and the compressor operation frequency decrease value meet the conditions,
then judge at preset time t 2 In the indoor unit, whether the difference value between the temperature of the outdoor side heat exchange tube and the temperature of the outdoor environment is smaller than or equal to a first preset temperature difference value and lasts for a first preset time, and whether the indoor current value is smaller than or equal to a current preset value,
and if the difference value and the duration time between the temperature of the outdoor side heat exchange tube and the outdoor environment temperature and the indoor current value meet the conditions, making a command that the refrigerant circulation has abnormal faults.
3. The method of detecting according to claim 2, wherein the first judgment policy signal includes:
if the outdoor environment temperature is less than or equal to 45 ℃ at the starting time and is less than or equal to 15 ℃, the indoor environment temperature is less than or equal to 45 ℃ at the starting time and is less than or equal to 15 ℃, and the running frequency of the compressor is more than or equal to 40Hz;
the temperature drop value DeltaT of the outdoor side heat exchange tube within 1min is more than or equal to 3, and the operating frequency drop value of the compressor is less than or equal to 0;
and if the difference value between the temperature of the outdoor side heat exchange tube and the outdoor environment temperature is less than or equal to 1.5 and lasts for 3min, and the indoor current value is less than or equal to 1.5A, an instruction that the refrigerant circulation has abnormal faults is given.
4. The method according to claim 2, wherein, in the case of the first determination policy signal, the air conditioner enters a refrigerant circulation cut-off protection when a refrigerant circulation abnormality is satisfied, comprising: and (3) shutting down the compressor, outputting refrigerant circulation abnormality information, starting the compressor after shutting down for a preset period of time, removing the refrigerant circulation abnormality information, recovering operation, and re-entering detection of refrigerant circulation abnormality.
5. The method according to claim 4, wherein after detecting the abnormality of the re-entering refrigerant circulation, it is determined that the predetermined time t is set 2 And if the difference value between the temperature of the outdoor side heat exchange tube and the temperature of the outdoor environment is smaller than or equal to a first preset temperature difference value, the continuous first preset time is not judged.
6. The method according to claim 1, wherein detecting the operation time of the air conditioner and outputting a judgment policy signal includes: if the running time of the air conditioner is smaller than the first preset time length, outputting a second judgment strategy signal; the second judgment policy signal includes:
judging whether the outdoor environment temperature at the starting time falls into a preset outdoor temperature range or not;
judging whether the indoor environment temperature at the starting time falls into a preset indoor temperature range or not;
judging whether the operation frequency of the compressor is larger than or equal to a preset operation frequency of the compressor;
judging whether the absolute value of the difference between the indoor environment temperature at the starting time and the indoor heat exchange tube temperature at the starting time is smaller than or equal to a second preset temperature difference;
judging whether the difference value between the indoor environment temperature and the indoor side heat exchange tube temperature is smaller than or equal to a third preset temperature difference value;
and if the outdoor environment temperature at the starting time, the indoor environment temperature at the starting time, the operating frequency of the compressor, the absolute value of the difference value between the indoor environment temperature at the starting time and the indoor heat exchange tube temperature at the starting time and the difference value between the indoor environment temperature and the indoor heat exchange tube temperature all meet the conditions, an instruction that the refrigerant circulation has abnormal faults is made.
7. The method according to claim 6, wherein,
if the running time of the air conditioner is greater than a second preset time length and less than or equal to the first preset time length, the second judgment strategy signal further comprises: judging whether the difference value between the temperature of the indoor heat exchange tube at the starting time and the minimum value of the temperature of the indoor heat exchange tube is smaller than or equal to a fourth preset temperature difference value;
if the running time of the air conditioner is less than or equal to a second preset duration, the second judgment strategy signal further comprises: and judging whether the difference value between the temperature of the indoor heat exchange tube at the starting time and the minimum value of the temperature of the indoor heat exchange tube at the inner side of the running time is smaller than or equal to a fifth preset temperature difference value.
8. The method according to claim 7, wherein,
if the running time of the air conditioner is greater than a second preset time length and less than or equal to the first preset time length, the second judgment strategy signal comprises: if the outdoor environment temperature is less than or equal to 45 ℃ at the starting time and is less than or equal to 15 ℃, the indoor environment temperature is less than or equal to 45 ℃ at the starting time and is less than or equal to 15 ℃, and the running frequency of the compressor is more than or equal to 40Hz; the absolute value of the difference between the indoor environment temperature at the starting time and the indoor heat exchange tube temperature at the starting time is less than or equal to 1.5 ℃, the difference between the indoor heat exchange tube temperature at the starting time and the indoor heat exchange tube temperature minimum value is less than or equal to 1.5 ℃, and then an instruction that the refrigerant circulation has abnormal faults is given;
if the running time of the air conditioner is greater than a second preset time length and less than or equal to the first preset time length, the second judgment strategy signal comprises: if the outdoor environment temperature is less than or equal to 45 ℃ at the starting time and is less than or equal to 15 ℃, the indoor environment temperature is less than or equal to 45 ℃ at the starting time and is less than or equal to 15 ℃, and the running frequency of the compressor is more than or equal to 40Hz; and the absolute value of the difference between the indoor environment temperature at the starting time and the indoor heat exchange tube temperature at the starting time is less than or equal to 1.5 ℃, the difference between the indoor heat exchange tube temperature at the starting time and the minimum value of the indoor heat exchange tube temperature at the inner side of the running time is less than or equal to 1.5 ℃, and then an instruction that the refrigerant circulation has abnormal faults is given.
9. The method according to claim 8, wherein in the case of the second determination policy signal, the air conditioner enters a refrigerant circulation cut-off protection when a refrigerant circulation abnormality is satisfied, comprising: shutting down the compressor, outputting refrigerant circulation abnormality information, starting the compressor after shutting down for a preset period of time, removing the refrigerant circulation abnormality information, recovering operation, and re-entering detection of refrigerant circulation abnormality; and after the detection of the abnormal circulation of the refrigerant is re-entered, whether the absolute value of the difference between the indoor environment temperature at the starting time and the indoor heat exchange tube temperature at the starting time is smaller than or equal to a second preset temperature difference is not judged.
10. An air conditioner for executing the method for detecting abnormality of refrigerant circulation according to any one of claims 1 to 9.
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| CN202311325139.9A CN117232101A (en) | 2023-10-12 | 2023-10-12 | Refrigerant circulation abnormality detection method and air conditioner |
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| CN202311325139.9A CN117232101A (en) | 2023-10-12 | 2023-10-12 | Refrigerant circulation abnormality detection method and air conditioner |
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