CN117213032A - Air conditioning system return air short circuit detection method and detection device and air conditioning system - Google Patents
Air conditioning system return air short circuit detection method and detection device and air conditioning system Download PDFInfo
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Abstract
The invention discloses an air conditioning system return air short circuit detection method, a detection device and an air conditioning system, wherein the air conditioning system return air short circuit detection method comprises the following steps: detecting the return air temperature, the pipeline temperature and the environment temperature of the air conditioning system when the air conditioning system is started and runs to be stable; calculating a first difference value between the return air temperature and the ambient temperature, and judging whether the return air of the air conditioning system is abnormal according to the first difference value; and when the return air of the air conditioning system is judged to be abnormal, calculating a second difference value between the return air temperature and the pipeline temperature, and judging whether the return air of the air conditioning system is short-circuited or not according to the second difference value. Compared with the prior art, the invention can verify whether the installation position of the unit is reasonable by detecting whether the return air is short-circuited or not when the air conditioning system is in trial operation, is convenient for an installer to adjust the installation position, and meanwhile, avoids the return air short-circuited, and improves the reliability of the unit.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to a return air short circuit detection method and device for an air conditioning system and the air conditioning system.
Background
At present, the phenomena of return air short circuit often occur in the actual use process of air conditioners for light commercial industries such as air pipe machines, courtyard machines and the like.
Return air short circuit: the air blown out from the air outlet is sucked back and forth again, so that the air outlet-back air short circuit is caused, the slight short circuit can cause the deterioration of refrigerating and heating effects, when the air outlet-back air short circuit becomes serious, the inner machine can not be operated in icing protection, the high pressure of heating is too high, the abnormal protection of the system such as high pressure protection is caused, and the long-term back air short circuit operation can also cause the abrasion and overload of the liquid back of the compressor.
Most of the occurrence of the return air short circuit is caused by poor installation position, irregular installation and the like, namely, the return air short circuit is generated in the installation and debugging stage, so that a series of installation problems of air outlet blockage or short distance, close direction and the like of the air outlet and the return air are caused, and the air outlet is sucked into the return air position.
At present, the detection and the treatment of the air return short circuit of the internal machine are concentrated on the courtyard machine, and the air opening action after the air return short circuit occurs solves the problem of the air return short circuit, and the problem can not be timely found out when the air return short circuit is reported to an installer in the test operation at the installation and debugging stage.
Disclosure of Invention
Aiming at the problem that whether an air-conditioning system has an air-return short circuit or not can not be reported to an installer in the test operation at the installation and debugging stage in the prior art, the invention provides an air-conditioning system air-return short circuit detection method and device and an air-conditioning system.
The technical scheme of the invention is that the method for detecting the return air short circuit of the air conditioning system is provided, and the return air temperature, the pipeline temperature and the environmental temperature of the air conditioning system are detected when the air conditioning system is started and runs to be stable;
calculating a first difference value between the return air temperature and the ambient temperature, and judging whether the return air of the air conditioning system is abnormal according to the first difference value;
and when the return air of the air conditioning system is judged to be abnormal, calculating a second difference value between the return air temperature and the pipeline temperature, and judging whether the return air of the air conditioning system is short-circuited or not according to the second difference value.
Further, the air conditioning system includes a cooling mode and a heating mode, and when the air conditioning system is in the cooling mode, whether the air conditioning system returns air abnormally is judged according to the first difference value, including:
judging whether the first difference value is smaller than a first threshold temperature difference or not;
if yes, judging that the return air of the air conditioning system is abnormal.
Further, when the air conditioning system is in the heating mode, judging whether the air conditioning system returns abnormally according to the first difference value, including:
judging whether the first difference value is larger than a third threshold temperature difference or not;
and if so, judging that the return air of the air conditioning system is abnormal.
Further, when the air conditioning system is in the refrigeration mode, judging whether the air conditioning system has a short circuit in return air according to the second difference value, including:
judging whether the second difference value is smaller than a second threshold temperature difference or not;
if yes, judging that the return air of the air conditioning system is short-circuited.
Further, when the air conditioning system is in the heating mode, judging whether the air conditioning system has a short circuit in return air according to the second difference value, including:
judging whether the second difference value is larger than a fourth threshold temperature difference or not;
if yes, judging that the return air of the air conditioning system is short-circuited.
Further, the value range of the first threshold temperature difference is-5-0 ℃;
the value range of the second threshold temperature difference is-4 ℃.
Further, the value range of the third threshold temperature difference is 0-10 ℃;
the value range of the fourth threshold temperature difference is-2-0 ℃.
Further, when the air conditioning system is in the refrigeration mode, judging whether the air conditioning system has a short circuit in return air according to the second difference value, and further comprising:
detecting a working gear of an air conditioner indoor unit of the air conditioning system;
and compensating the second threshold temperature difference according to the working gear, and judging whether the air conditioning system is in return air short circuit or not according to the compensated second threshold temperature difference.
Further, when the air conditioning system is in the heating mode, judging whether the air conditioning system has a short circuit in return air according to the second difference value, and further comprising:
detecting a working gear of an air conditioner indoor unit of the air conditioning system;
and compensating the fourth threshold temperature difference according to the working gear, and judging whether the air conditioning system is in return air short circuit or not according to the compensated fourth threshold temperature difference.
Further, the air conditioner indoor unit of the air conditioning system is provided with four working gears, and when the air conditioner indoor unit works in the first gear, the compensation value for compensating the second threshold temperature difference is a first compensation value;
when the air conditioner indoor unit works in a second gear, the compensation value for compensating the second threshold temperature difference is a second compensation value;
when the air conditioner internal unit works in a third gear, the compensation value for compensating the second threshold temperature difference is a third compensation value;
when the air conditioner internal unit works in the fourth gear, the compensation value for compensating the second threshold temperature difference is a fourth compensation value.
Further, the air conditioner indoor unit of the air conditioning system is provided with four working gears, and when the air conditioner indoor unit works in the first gear, the compensation value for compensating the fourth threshold temperature difference is a fifth compensation value;
when the air conditioner indoor unit works in the second gear, the compensation value for compensating the fourth threshold temperature difference is a sixth compensation value;
when the air conditioner internal unit works in the third gear, the compensation value for compensating the fourth threshold temperature difference is a seventh compensation value;
when the air conditioner internal unit works in the fourth gear, the compensation value for compensating the fourth threshold temperature difference is an eighth compensation value.
Further, the first compensation value is 0, the value ranges of the second compensation value, the third compensation value and the fourth compensation value are 0-5 ℃, the second compensation value is smaller than the third compensation value, and the third compensation value is smaller than the fourth compensation value.
Further, the fifth compensation value is 0, the sixth compensation value, the seventh compensation value and the eighth compensation value are in a value range of-5 ℃ to 0 ℃, the sixth compensation value is larger than the seventh compensation value, and the seventh compensation value is larger than the eighth compensation value.
Further, when the air conditioning system is provided with an air outlet temperature sensing bulb, and when the air conditioning system is judged to return air abnormally, the air conditioning system return air short circuit detection method further comprises the following steps:
detecting the air outlet temperature of the air conditioning system;
calculating a return air short-circuit ratio of the air conditioning system according to the air outlet temperature, the return air temperature and the ambient temperature;
and judging the return air state of the air conditioning system according to the return air short circuit ratio.
Further, the calculation model of the return air short-circuit ratio is as follows:
phi = (T return air-T environment)/(T outlet air-T environment)
Wherein phi is the return air short-circuit ratio, treturn air is the return air temperature, toutlet air is the outlet air temperature,
and Tenvironment is the ambient temperature.
Further, when the air conditioning system is in the refrigeration mode, determining the return air state of the air conditioning system according to the return air short-circuit ratio includes:
comparing the return air short-circuit ratio with a first preset ratio and a second preset ratio which are preset, and judging a preset interval in which the return air short-circuit ratio is located;
when the return air short-circuit ratio is in a first preset interval, judging that the return air of the air conditioning system is normal;
when the return air short-circuit ratio is in a second preset interval, judging that the air conditioning system is in return air short-circuit;
and when the return air short-circuit ratio is in a third preset interval, judging that the air conditioning system is in fault.
Further, when the air conditioning system is in the heating mode, determining the return air state of the air conditioning system according to the return air short-circuit ratio includes:
comparing the return air short-circuit ratio with a third preset ratio and a fourth preset ratio which are preset, and judging a preset interval in which the return air short-circuit ratio is located;
when the return air short-circuit ratio is in a fourth preset interval, judging that the return air of the air conditioning system is normal;
when the return air short-circuit ratio is in a fifth preset interval, judging that the air conditioning system is in return air short-circuit;
and when the return air short-circuit ratio is in a sixth preset interval, judging that the air conditioning system is in fault.
Further, the value range of the first preset ratio is 10% -40%, and the value range of the second preset ratio is 40% -70%;
the first preset interval is 0-phi 1, the second preset interval is phi 1-phi 2, and the third preset interval is phi 2-1;
wherein, phi 1 is a first preset ratio, and phi 2 is a second preset ratio.
Further, the value range of the third preset ratio is 10% -40%, and the value range of the fourth preset ratio is 40% -70%;
the fourth preset interval is 0-phi 3, the fifth preset interval is phi 3-phi 4, and the sixth preset interval is phi 3-1;
wherein, Φ3 is a third preset ratio, Φ4 is a fourth preset ratio.
The invention also provides an air-conditioning system return air short circuit detection device adopting the air-conditioning system return air short circuit detection method, which comprises the following steps: the device comprises a return air temperature sensing bulb for detecting return air temperature, a wire controller temperature sensing bulb for detecting ambient temperature, a pipe temperature sensing bulb for detecting pipeline temperature and an air outlet temperature sensing bulb for detecting air outlet temperature;
the air conditioning system return air short circuit detection device judges whether the air conditioning system returns air abnormally or not by calculating the difference between the temperature of the return air temperature sensing bulb and the temperature of the wire controller temperature sensing bulb;
and judging whether the air conditioning system is in return short circuit or not by calculating the difference between the temperature of the return air temperature sensing bulb and the temperature of the pipe temperature sensing bulb.
The invention also provides an air conditioning system which is provided with the air conditioning system return air short circuit detection device.
Compared with the prior art, the invention has at least the following beneficial effects:
1. according to the invention, when the air conditioning system is in trial operation, whether the air conditioning system is in return air short circuit or not can be judged through the first difference value and the second difference value, so that whether the installation position of the unit is reasonable or not is verified, the problem can be identified in the installation stage, and the installation position can be conveniently adjusted by an installer;
2. the invention can detect whether the air conditioning system has the return air short circuit and report the return air short circuit, can avoid the problems that the return air short circuit occurs when the air conditioner is used, the heat exchange efficiency is low, and the actual use effect is affected, and improves the reliability of the unit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of detecting an air-out short circuit of an air conditioning system in a cooling mode;
FIG. 2 is a flow chart of detecting an air-out short circuit in a heating mode of the air conditioning system according to the present invention;
FIG. 3 is a compensation flow chart of the air conditioning system of the present invention for compensating for a second threshold temperature difference in a cooling mode;
FIG. 4 is a compensation flow chart of the air conditioning system according to the present invention for compensating the fourth threshold temperature difference in the heating mode;
FIG. 5 is a flow chart of detecting an air-out short circuit in a cooling mode when an air conditioning system is provided with an air-out temperature sensing bulb;
fig. 6 is a flow chart of detecting an air-out short circuit in a heating mode when the air conditioning system is provided with an air-out temperature sensing bulb.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Thus, reference throughout this specification to one feature will be used in order to describe one embodiment of the invention, not to imply that each embodiment of the invention must be in the proper motion. Furthermore, it should be noted that the present specification describes a number of features. Although certain features may be combined together to illustrate a possible system design, such features may be used in other combinations not explicitly described. Thus, unless otherwise indicated, the illustrated combinations are not intended to be limiting.
The principles and structures of the present invention are described in detail below with reference to the drawings and the examples.
At present, air conditioners for light commercial use such as an air pipe machine, a courtyard machine and the like often have the phenomenon of air return short circuit in the actual use process, but at present, the problem of whether the air conditioner system has the air return short circuit or not can not be detected when the air conditioner system is in trial operation. The invention has the idea that whether the air conditioning system has the return air short circuit problem is judged by detecting the first difference value between the return air temperature and the ambient temperature and the second difference value between the return air temperature and the pipeline temperature, so that the detection in the test operation is realized, and the installation position is convenient for an installer to adjust.
The technical scheme of the invention is that the method for detecting the return air short circuit of the air conditioning system comprises the following steps:
detecting the return air temperature, the pipeline temperature and the environment temperature of the air conditioning system when the air conditioning system is started and runs to be stable;
calculating a first difference value between the return air temperature and the ambient temperature, and judging whether the return air of the air conditioning system is abnormal or not according to the first difference value;
and when the return air of the air conditioning system is judged to be abnormal, calculating a second difference value between the return air temperature and the pipeline temperature, and judging whether the return air of the air conditioning system is short-circuited or not according to the second difference value.
According to the invention, whether the air conditioning system has the return air short circuit or not can be judged through the first difference value and the second difference value, and the problem of whether the air conditioning system has the return air short circuit or not can be found when the air conditioning system is in test operation, so that the installation position can be conveniently adjusted by an installer.
Wherein, air conditioning system includes refrigeration mode and heating mode, and when air conditioning system is in refrigeration mode, judge whether air conditioning system return air is unusual according to first difference, include:
judging whether the first difference value is smaller than a first threshold temperature difference or not;
if yes, judging that the return air of the air conditioning system is abnormal.
In the refrigeration mode, when the air conditioning system normally operates, the return air temperature of the air conditioning system is equal to the ambient temperature, but when the air conditioning system has a return air short circuit, cold air blown out by refrigeration is sucked back to the return air position, so that the return air temperature is reduced, and when the return air temperature is lower than the ambient temperature, the air conditioning system is abnormal in return air, and further detection is needed.
The first threshold temperature difference is set according to the actual working condition, and whether the air conditioning system returns air abnormally can be rapidly identified by comparing the first difference with the first threshold temperature difference.
Further, when the air conditioning system is in the cooling mode, judging whether the air conditioning system is in a return air short circuit according to the second difference value, including:
judging whether the second difference value is smaller than a second threshold temperature difference or not;
if yes, judging that the return air of the air conditioning system is short-circuited.
The detection process is only executed when the return air of the air conditioning system is abnormal, so that judgment steps are saved, the second threshold temperature difference is set according to actual working conditions, if the second threshold temperature difference is smaller than the second threshold temperature difference, the fact that larger cold air is sucked back (the return air temperature is higher than the pipeline temperature under normal conditions, and the temperature difference between the return air temperature and the pipeline temperature is smaller only when the return air short circuit occurs), so that the return air short circuit can be considered to occur.
Referring to fig. 1, a flow chart of detecting a return air short circuit of an air conditioning system in a cooling mode according to the present invention is shown, wherein T Return air For return air temperature, T Ring temperature At ambient temperature, T Pipe temperature For the pipeline temperature, n1 is a first threshold temperature difference, n2 is a second threshold temperature difference, Δt is a first difference, Δt is a second difference;
and in the refrigeration mode, the compressor is operated for S1 minute firstly, so that the air conditioning system is started and is operated to be stable, then a first difference value is calculated through the return air temperature and the ambient temperature, whether the first difference value is smaller than a first threshold temperature difference or not is judged, when the first difference value is smaller than the first threshold temperature difference, the air conditioning system is judged to be abnormal in return air, a second difference value is calculated through the return air temperature and the pipeline temperature, whether the second difference value is smaller than a second threshold temperature difference or not is judged, and when the second difference value is smaller than the second threshold temperature difference, the air conditioning system is judged to be in return air short circuit.
Wherein S1 is the time for the air conditioning system to reach relative stability, and is generally set to 10-30 minutes, and the value range of n1 is-5-0 ℃, namely, the judgment is carried out when the return air temperature is lower than the ambient temperature;
the value range of n2 is-4 ℃.
Through the steps, the invention can realize detection in test operation, and is convenient for installers to adjust the installation position.
When the air conditioning system is in a heating mode, judging whether the air conditioning system returns air abnormally according to the first difference value, including:
judging whether the first difference value is larger than a third threshold temperature difference or not;
and if so, judging that the return air of the air conditioning system is abnormal.
Under heating mode, when air conditioning system normally operates, its return air temperature equals ambient temperature, but when air conditioning system appears the return air short circuit, the hot-blast that heats and blows out can be sucked back to return air department again, and then leads to return air temperature to rise, so when the return air temperature is higher than ambient temperature appearing, indicate that air conditioning system return air is unusual this moment, need further detect.
The third threshold temperature difference is set according to the actual working condition, and whether the air conditioning system returns air abnormally can be rapidly identified by comparing the first difference value with the third threshold temperature difference.
Further, when the air conditioning system is in the heating mode, judging whether the air conditioning system has a short circuit in return air according to the second difference value, including:
judging whether the second difference value is larger than a fourth threshold temperature difference;
if yes, judging that the return air of the air conditioning system is short-circuited.
The detection process is only executed when the return air of the air conditioning system is abnormal, so that judgment steps are saved, the fourth threshold temperature difference is set according to actual working conditions, if the second difference value is larger than the fourth threshold temperature difference, the fact that larger hot air is sucked back (the return air temperature is lower than the pipeline temperature under normal conditions, and the temperature difference between the return air temperature and the pipeline temperature is smaller only when the return air short circuit occurs), so that the return air short circuit can be considered to occur.
Referring to fig. 2, a flow chart of detecting a return air short circuit of an air conditioning system in a heating mode according to the present invention is shown, wherein T Return air For return air temperature, T Ring temperature At ambient temperature, T Pipe temperature The pipeline temperature is the third threshold temperature difference, n3 is the fourth threshold temperature difference, deltaT is the first difference and Δt is the second difference;
in the heating mode, the compressor is operated for S2 minutes to ensure that the air conditioning system is started and operated to be stable, then a first difference value is calculated through the return air temperature and the ambient temperature, whether the first difference value is larger than a third threshold temperature difference or not is judged, when the first difference value is larger than the third threshold temperature difference, the air conditioning system is judged to be abnormal in return air, a second difference value is calculated through the return air temperature and the pipeline temperature, whether the second difference value is larger than a fourth threshold temperature difference or not is judged, and when the second difference value is larger than the fourth threshold temperature difference, the air conditioning system is judged to be in return air short circuit.
Wherein S2 is the time for the air conditioning system to reach relative stability, and is generally set to 10-30 minutes, and the value range of n3 is-5-0 ℃, namely, the judgment is carried out when the return air temperature is lower than the ambient temperature;
the value range of n4 is-4 ℃.
Through the steps, the invention can realize detection in test operation, and is convenient for installers to adjust the installation position.
Further, when the air conditioning system is in the refrigeration mode, judging whether the air conditioning system is in a return air short circuit or not according to the second difference value, and further comprising:
detecting a working gear of an air conditioner indoor unit of an air conditioning system;
and compensating the second threshold temperature difference according to the working gear, and judging whether the air conditioning system is in return air short circuit or not according to the compensated second threshold temperature difference.
Here, since the air conditioning system has a plurality of working gears, the power of the return air in each working gear is different, the second threshold temperature difference needs to be compensated according to the actual working gears, specifically, when the air conditioning system is in the cooling mode, the air conditioning indoor unit of the air conditioning system has four working gears, and when the air conditioning indoor unit works in the first gear, the compensation value for compensating the second threshold temperature difference is the first compensation value;
when the air conditioner internal unit works in the second gear, the compensation value for compensating the second threshold temperature difference is a second compensation value;
when the air conditioner internal unit works in the third gear, the compensation value for compensating the second threshold temperature difference is a third compensation value;
when the air conditioner internal unit works in the fourth gear, the compensation value for compensating the second threshold temperature difference is a fourth compensation value.
By the method, the second threshold temperature difference can be compensated according to the working gear of the air conditioner indoor unit of the air conditioning system, and the reliability of the air conditioning system for detecting the return air short circuit is further improved.
Wherein the first compensation value is 0, the second compensation value, the third compensation value and the fourth compensation value are in the range of 0-5 ℃, the second compensation value is smaller than the third compensation value, and the third compensation value is smaller than the fourth compensation value.
Referring to fig. 3, a compensation flow chart of the air conditioning system of the present invention for compensating the second threshold temperature difference in the cooling mode is shown, wherein T Return air For return air temperature, T Ring temperature The temperature sensor is characterized in that the temperature sensor is an ambient temperature, n1 is a first threshold temperature difference, n2 is a second threshold temperature difference, deltaT is a first difference, a first gear is an ultra-high gear, a second gear is a high gear, a third gear is a middle gear, a fourth gear is a resisting gear, a second compensation value is a, a third compensation value is b, and a fourth compensation value is c;
in the refrigeration mode, firstly enabling the compressor to operate for 1 minute, ensuring that the air conditioning system is started and operates to be stable, then calculating a first difference value through the return air temperature and the ambient temperature, judging whether the first difference value is smaller than a first threshold temperature difference, and judging that the return air is abnormal when judging that the first difference value is smaller than the first threshold temperature difference;
then compensating the second threshold temperature difference according to the gear of the air conditioner internal unit of the air conditioning system, wherein the difference is made, and the first compensation value is 0, so that the second threshold temperature difference is still used for judging in the first gear, and the second threshold temperature difference and the corresponding compensation value are used for judging in the second gear, the third gear and the fourth gear;
when the second difference value at the moment, namely the difference value between the return air temperature and the pipeline temperature is smaller than the compensated second threshold temperature difference, the occurrence of the return air short circuit can be determined.
By the method, the second threshold temperature difference can be compensated according to the working gear of the air conditioner indoor unit of the air conditioning system, and the reliability of the air conditioning system for detecting the return air short circuit is further improved.
Further, when the air conditioning system is in the heating mode, judging whether the air conditioning system has a short circuit in return air according to the second difference value, and further comprising:
detecting a working gear of an air conditioner indoor unit of an air conditioning system;
and compensating the fourth threshold temperature difference according to the working gear, and judging whether the air conditioning system is in return air short circuit or not according to the compensated fourth threshold temperature difference.
Here, since the air conditioning system has a plurality of working gears, the power of the return air in each working gear is different, the fourth threshold temperature difference needs to be compensated according to the actual working gears, specifically, when the air conditioning system is in the heating mode, the air conditioning indoor unit of the air conditioning system has four working gears, and when the air conditioning indoor unit works in the first gear, the compensation value for compensating the fourth threshold temperature difference is the fifth compensation value;
when the air conditioner internal unit works in the second gear, the compensation value for compensating the fourth threshold temperature difference is a sixth compensation value;
when the air conditioner internal unit works in the third gear, the compensation value for compensating the fourth threshold temperature difference is a seventh compensation value;
when the air conditioner internal unit works in the fourth gear, the compensation value for compensating the fourth threshold temperature difference is an eighth compensation value.
By the method, the fourth threshold temperature difference can be compensated according to the working gear of the air conditioner indoor unit of the air conditioning system, and the reliability of the air conditioning system for detecting the return air short circuit is further improved.
Wherein the fifth compensation value is 0, the sixth compensation value, the seventh compensation value and the eighth compensation value are in a range of-5-0 ℃, the sixth compensation value is larger than the seventh compensation value, and the seventh compensation value is larger than the eighth compensation value.
Please refer to the figure4, it is a compensation flow chart for compensating the fourth threshold temperature difference in the heating mode of the air conditioning system, wherein T Return air For return air temperature, T Ring temperature The temperature difference is the ambient temperature, n3 is the third threshold temperature difference, n4 is the fourth threshold temperature difference, deltaT is the first difference, the first gear is the super high gear, the second gear is the high gear, the third gear is the middle gear, the fourth gear is the resisting gear, the sixth compensation value is d, the seventh compensation value is e, and the eighth compensation value is f;
in a heating mode, firstly enabling the compressor to operate for S2 minutes, ensuring that an air conditioning system is started and operates to be stable, then calculating a first difference value through return air temperature and ambient temperature, judging whether the first difference value is larger than a third threshold temperature difference, and judging that return air is abnormal when judging that the first difference value is larger than the third threshold temperature difference;
then compensating the fourth threshold temperature difference according to the gear of the air conditioner internal unit of the air conditioning system, wherein the difference is made, and the fifth compensation value is 0, so that the fourth threshold temperature difference is still used for judging in the first gear, and the difference between the fourth threshold temperature difference and the corresponding compensation value is used for judging in the second gear, the third gear and the fourth gear;
when the second difference value at the moment, namely the difference value between the return air temperature and the pipeline temperature is smaller than the compensated fourth threshold temperature difference, the occurrence of the return air short circuit can be determined.
By the method, the second threshold temperature difference can be compensated according to the working gear of the air conditioner indoor unit of the air conditioning system, and the reliability of the air conditioning system for detecting the return air short circuit is further improved.
Further, when the air conditioning system is provided with the air outlet temperature sensing bulb, and when the air conditioning system is judged to return air abnormality, the air conditioning system return air short circuit detection method further comprises the following steps:
detecting the air outlet temperature of an air conditioning system;
calculating the return air short-circuit ratio of the air conditioning system according to the air outlet temperature, the return air temperature and the ambient temperature;
and judging the return air state of the air conditioning system according to the return air short circuit ratio.
Here, when air conditioning system is provided with air-out temperature sensing bulb, can be accurate detect air-out temperature, through air-out temperature, return air temperature, ambient temperature and amount of wind just can calculate the proportion that the air-out was inhaled back to the return air, has appeared the return air short circuit when being inhaled the proportion of returning greatly, influences the result of use, and when the proportion is big to a certain extent, it has all been inhaled by the return air to indicate that the wind of blowing out mostly has gone back, influences the reliability of unit, need shut down investigation.
Therefore, through the scheme, the return air short-circuit ratio can be accurately detected, and the return air state of the air conditioning system can be accurately judged.
The calculation model of the return air short circuit ratio is as follows:
Ф＝(T return air -T Environment (environment) )/(T Air outlet -T Environment (environment) )
Wherein, phi is the ratio of return air short circuit, T Return air Is the return air temperature T Air outlet T is the temperature of the air outlet Environment (environment) Is ambient temperature.
The calculation principle is as follows:
total air volume g=short-circuit air volume g1+environmental return air volume G2;
because the short-circuit wind temperature T1 can be assumed to be equal to the air outlet temperature T Air outlet Equal, the ambient temperature is the temperature T of the wire controller Environment (environment) The return air temperature is T Return air Thus there is G1 Cp T Air outlet +G2*Cp*T Environment (environment) ＝G*Cp*T Return air
To obtain phi = (T) Return air -T Environment (environment) )/(T Air outlet -T Environment (environment) )。
When the air conditioning system is in the refrigeration mode, the judging the return air state of the air conditioning system according to the return air short-circuit ratio comprises the following steps:
comparing the return air short-circuit ratio with a first preset ratio and a second preset ratio which are preset, and judging a preset interval in which the return air short-circuit ratio is located;
when the return air short-circuit ratio is in a first preset interval, judging that the return air of the air conditioning system is normal;
when the return air short-circuit ratio is in a second preset interval, judging that the return air of the air conditioning system is short-circuited;
and when the return air short-circuit ratio is in a third preset interval, judging that the air conditioning system is in fault.
According to the method, after the return air short-circuit ratio is calculated, the return air state of the air conditioning system can be accurately judged.
Wherein, the value range of the first preset ratio is 10% -40%, and the value range of the second preset ratio is 40% -70%;
the first preset interval is 0-phi 1, the second preset interval is phi 1-phi 2, and the third preset interval is phi 2-1;
wherein, phi 1 is a first preset ratio, and phi 2 is a second preset ratio.
Please refer to fig. 5, which is a flow chart for detecting an air-out short circuit in a cooling mode when the air conditioning system of the present invention is provided with an air-out temperature sensing bulb, wherein T Return air For return air temperature, T Ring temperature For the ambient temperature, n1 is a first threshold temperature difference, phi is a return air short-circuit ratio, phi 1 is a first preset ratio, phi 2 is a second preset ratio, and DeltaT is a first difference;
in the refrigeration mode, firstly enabling the compressor to operate for 1 minute, ensuring that the air conditioning system is started and operates to be stable, then calculating a first difference value through the return air temperature and the ambient temperature, judging whether the first difference value is smaller than a first threshold temperature difference, and judging that the return air is abnormal when judging that the first difference value is smaller than the first threshold temperature difference;
then calculating a return air short-circuit ratio, further judging a return air state according to the return air short-circuit ratio, and judging that the return air of the air conditioning system is normal when the return air short-circuit ratio is in a first preset interval;
when the return air short-circuit ratio is in a second preset interval, judging that the return air of the air conditioning system is short-circuited;
and when the return air short-circuit ratio is in a third preset interval, judging that the air conditioning system is in fault and the return air short-circuit is serious.
In conclusion, through the scheme, the return air short-circuit ratio can be accurately detected, and the return air state of the air conditioning system can be accurately judged.
When the air conditioning system is in the heating mode, the judging the return air state of the air conditioning system according to the return air short-circuit ratio comprises the following steps:
comparing the return air short-circuit ratio with a third preset ratio and a fourth preset ratio which are preset, and judging a preset interval in which the return air short-circuit ratio is located;
when the return air short-circuit ratio is in a fourth preset interval, judging that the return air of the air conditioning system is normal;
when the return air short circuit ratio is in a fifth preset interval, judging that the return air of the air conditioning system is short-circuited;
and when the return air short-circuit ratio is in a sixth preset interval, judging that the air conditioning system is in fault.
According to the method, after the return air short-circuit ratio is calculated, the return air state of the air conditioning system can be accurately judged.
Wherein the value range of the third preset ratio is 10% -40%, and the value range of the fourth preset ratio is 40% -70%;
the fourth preset interval is 0-phi 3, the fifth preset interval is phi 3-phi 4, and the sixth preset interval is phi 4-1;
wherein, Φ3 is a third preset ratio, Φ4 is a fourth preset ratio.
Fig. 6 is a flow chart for detecting an air-out short circuit in a heating mode when the air conditioning system of the present invention is provided with an air-out temperature sensing bulb, wherein T is as follows Return air For return air temperature, T Ring temperature For the ambient temperature, n3 is a third threshold temperature difference, Φ is a return air short-circuit ratio, Φ3 is a third preset ratio, Φ4 is a fourth preset ratio, and Δt is a first difference;
in a heating mode, firstly enabling the compressor to operate for S2 minutes, ensuring that an air conditioning system is started and operates to be stable, then calculating a first difference value through return air temperature and ambient temperature, judging whether the first difference value is larger than a third threshold temperature difference, and judging that return air is abnormal when judging that the first difference value is larger than the third threshold temperature difference;
then calculating a return air short-circuit ratio, further judging a return air state according to the return air short-circuit ratio, and judging that the return air of the air conditioning system is normal when the return air short-circuit ratio is in a fourth preset interval;
when the return air short circuit ratio is in a fifth preset interval, judging that the return air of the air conditioning system is short-circuited;
and when the return air short-circuit ratio is in a sixth preset interval, judging that the air conditioning system is in fault and the return air short-circuit is serious.
In conclusion, through the scheme, the return air short-circuit ratio can be accurately detected, and the return air state of the air conditioning system can be accurately judged.
In summary, compared with the prior art, the invention has at least the following beneficial effects:
1. according to the invention, when the air conditioning system is in trial operation, whether the air conditioning system is in return air short circuit or not can be judged through the first difference value and the second difference value, so that whether the installation position of the unit is reasonable or not is verified, the problem can be identified in the installation stage, and the installation position can be conveniently adjusted by an installer;
2. the invention can detect whether the air conditioning system has the return air short circuit and report the return air short circuit, can avoid the problems that the return air short circuit occurs when the air conditioner is used, the heat exchange efficiency is low, and the actual use effect is affected, and improves the reliability of the unit.
The invention also provides an air-conditioning system return air short circuit detection device adopting the air-conditioning system return air short circuit detection method, which comprises the following steps: the device comprises a return air temperature sensing bulb for detecting return air temperature, a wire controller temperature sensing bulb for detecting ambient temperature, a pipe temperature sensing bulb for detecting pipeline temperature and an air outlet temperature sensing bulb for detecting air outlet temperature;
the air conditioning system return air short circuit detection device judges whether the air conditioning system returns air abnormally or not by calculating the difference between the temperature of the return air temperature sensing bag and the temperature of the wire controller temperature sensing bag;
and judging whether the air conditioning system is in return short circuit or not by calculating the difference between the temperature of the return air temperature sensing bulb and the temperature of the pipe temperature sensing bulb.
The invention also provides an air conditioning system which is provided with the air conditioning system return air short circuit detection device.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (21)
1. The method for detecting the return air short circuit of the air conditioning system is characterized by comprising the following steps of:
detecting the return air temperature, the pipeline temperature and the environment temperature of the air conditioning system when the air conditioning system is started and runs to be stable;
calculating a first difference value between the return air temperature and the ambient temperature, and judging whether the return air of the air conditioning system is abnormal according to the first difference value;
and when the return air of the air conditioning system is judged to be abnormal, calculating a second difference value between the return air temperature and the pipeline temperature, and judging whether the return air of the air conditioning system is short-circuited or not according to the second difference value.
2. The method for detecting a return air short circuit of an air conditioning system according to claim 1, wherein the air conditioning system includes a cooling mode and a heating mode, and when the air conditioning system is in the cooling mode, determining whether the return air of the air conditioning system is abnormal according to the first difference value includes:
judging whether the first difference value is smaller than a first threshold temperature difference or not;
if yes, judging that the return air of the air conditioning system is abnormal.
3. The method for detecting a return air short circuit of an air conditioning system according to claim 2, wherein determining whether the return air of the air conditioning system is abnormal according to the first difference value when the air conditioning system is in a heating mode, comprises:
judging whether the first difference value is larger than a third threshold temperature difference or not;
and if so, judging that the return air of the air conditioning system is abnormal.
4. The method for detecting a return air short circuit of an air conditioning system according to claim 2, wherein determining whether the air conditioning system is in a return air short circuit according to the second difference value when the air conditioning system is in a cooling mode comprises:
judging whether the second difference value is smaller than a second threshold temperature difference or not;
if yes, judging that the return air of the air conditioning system is short-circuited.
5. A method for detecting a return air short circuit of an air conditioning system according to claim 3, wherein determining whether the air conditioning system is in a return air short circuit according to the second difference value when the air conditioning system is in a heating mode comprises:
judging whether the second difference value is larger than a fourth threshold temperature difference or not;
if yes, judging that the return air of the air conditioning system is short-circuited.
6. The method for detecting a return air short circuit of an air conditioning system according to claim 4, wherein the value range of the first threshold temperature difference is-5 ℃ to 0 ℃;
the value range of the second threshold temperature difference is-4 ℃.
7. The method for detecting a return air short circuit of an air conditioning system according to claim 5, wherein the third threshold temperature difference has a value ranging from 0 ℃ to 10 ℃;
the value range of the fourth threshold temperature difference is-2-0 ℃.
8. The method for detecting a return air short circuit of an air conditioning system according to claim 4, wherein when the air conditioning system is in a cooling mode, determining whether the air conditioning system is in a return air short circuit according to the second difference value, further comprises:
detecting a working gear of an air conditioner indoor unit of the air conditioning system;
and compensating the second threshold temperature difference according to the working gear, and judging whether the air conditioning system is in return air short circuit or not according to the compensated second threshold temperature difference.
9. The method for detecting a return air short circuit of an air conditioning system according to claim 5, wherein when the air conditioning system is in a heating mode, determining whether the air conditioning system is in a return air short circuit according to the second difference value, further comprises:
detecting a working gear of an air conditioner indoor unit of the air conditioning system;
and compensating the fourth threshold temperature difference according to the working gear, and judging whether the air conditioning system is in return air short circuit or not according to the compensated fourth threshold temperature difference.
10. The method for detecting a return air short circuit of an air conditioning system according to claim 8, wherein an air conditioner indoor unit of the air conditioning system has four working gears, and when the air conditioner indoor unit works in a first gear, a compensation value for compensating the second threshold temperature difference is a first compensation value;
when the air conditioner indoor unit works in a second gear, the compensation value for compensating the second threshold temperature difference is a second compensation value;
when the air conditioner internal unit works in a third gear, the compensation value for compensating the second threshold temperature difference is a third compensation value;
when the air conditioner internal unit works in the fourth gear, the compensation value for compensating the second threshold temperature difference is a fourth compensation value.
11. The method for detecting a return air short circuit of an air conditioning system according to claim 9, wherein an air conditioner indoor unit of the air conditioning system has four working gears, and when the air conditioner indoor unit works in a first gear, a compensation value for compensating the fourth threshold temperature difference is a fifth compensation value;
when the air conditioner indoor unit works in the second gear, the compensation value for compensating the fourth threshold temperature difference is a sixth compensation value;
when the air conditioner internal unit works in the third gear, the compensation value for compensating the fourth threshold temperature difference is a seventh compensation value;
when the air conditioner internal unit works in the fourth gear, the compensation value for compensating the fourth threshold temperature difference is an eighth compensation value.
12. The method for detecting a short circuit in return air of an air conditioning system according to claim 10, wherein the first compensation value is 0, the second compensation value, the third compensation value, and the fourth compensation value are in a range of 0-5 ℃, and the second compensation value is smaller than the third compensation value, and the third compensation value is smaller than the fourth compensation value.
13. The method for detecting a return air short circuit of an air conditioning system according to claim 11, wherein the fifth compensation value is 0, the sixth compensation value, the seventh compensation value, and the eighth compensation value are in a range of-5 to 0 ℃, the sixth compensation value is greater than the seventh compensation value, and the seventh compensation value is greater than the eighth compensation value.
14. The air conditioning system return air short circuit detection method according to claim 2, wherein when the air conditioning system is provided with an air outlet bulb, the air conditioning system return air short circuit detection method further comprises:
detecting the air outlet temperature of the air conditioning system;
calculating a return air short-circuit ratio of the air conditioning system according to the air outlet temperature, the return air temperature and the ambient temperature;
and judging the return air state of the air conditioning system according to the return air short circuit ratio.
15. The method for detecting a return air short circuit of an air conditioning system according to claim 14, wherein the calculation model of the return air short circuit ratio is:
Ф＝(T return air -T Environment (environment) )/(T Air outlet -T Environment (environment) )
Wherein phi is the return air short-circuit ratio, T Return air For the return air temperature, T Air outlet T is the temperature of the air outlet Environment (environment) Is the ambient temperature.
16. The method for detecting a return air short circuit of an air conditioning system according to claim 14, wherein determining a return air state of the air conditioning system according to the return air short circuit ratio when the air conditioning system is in a cooling mode comprises:
comparing the return air short-circuit ratio with a first preset ratio and a second preset ratio which are preset, and judging a preset interval in which the return air short-circuit ratio is located;
when the return air short-circuit ratio is in a first preset interval, judging that the return air of the air conditioning system is normal;
when the return air short-circuit ratio is in a second preset interval, judging that the air conditioning system is in return air short-circuit;
and when the return air short-circuit ratio is in a third preset interval, judging that the air conditioning system is in fault.
17. The method for detecting a return air short circuit of an air conditioning system according to claim 14, wherein determining a return air state of the air conditioning system according to the return air short circuit ratio when the air conditioning system is in a heating mode comprises:
comparing the return air short-circuit ratio with a third preset ratio and a fourth preset ratio which are preset, and judging a preset interval in which the return air short-circuit ratio is located;
when the return air short-circuit ratio is in a fourth preset interval, judging that the return air of the air conditioning system is normal;
when the return air short-circuit ratio is in a fifth preset interval, judging that the air conditioning system is in return air short-circuit;
and when the return air short-circuit ratio is in a sixth preset interval, judging that the air conditioning system is in fault.
18. The method for detecting a short circuit in return air of an air conditioning system according to claim 16, wherein the value range of the first preset ratio is 10% -40%, and the value range of the second preset ratio is 40% -70%;
the first preset interval is 0-phi 1, the second preset interval is phi 1-phi 2, and the third preset interval is phi 2-1;
wherein, phi 1 is a first preset ratio, and phi 2 is a second preset ratio.
19. The method for detecting a short circuit of return air of an air conditioning system according to claim 17, wherein the value range of the third preset ratio is 10% -40%, and the value range of the fourth preset ratio is 40% -70%;
the fourth preset interval is 0-phi 3, the fifth preset interval is phi 3-phi 4, and the sixth preset interval is phi 3-1;
wherein, Φ3 is a third preset ratio, Φ4 is a fourth preset ratio.
20. An air conditioning system return air short circuit detection apparatus employing an air conditioning system return air short circuit detection method as claimed in any one of claims 1 to 19, comprising: the device comprises a return air temperature sensing bulb for detecting return air temperature, a wire controller temperature sensing bulb for detecting ambient temperature, a pipe temperature sensing bulb for detecting pipeline temperature and an air outlet temperature sensing bulb for detecting air outlet temperature;
the air conditioning system return air short circuit detection device judges whether the air conditioning system returns air abnormally or not by calculating the difference between the temperature of the return air temperature sensing bulb and the temperature of the wire controller temperature sensing bulb;
and judging whether the air conditioning system is in return short circuit or not by calculating the difference between the temperature of the return air temperature sensing bulb and the temperature of the pipe temperature sensing bulb.
21. An air conditioning system having an air conditioning system return air short circuit detection apparatus as set forth in claim 20.
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