CN110887166B - Air conditioner refrigerant leakage detection method and air conditioner - Google Patents
Air conditioner refrigerant leakage detection method and air conditioner Download PDFInfo
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- CN110887166B CN110887166B CN201811054001.9A CN201811054001A CN110887166B CN 110887166 B CN110887166 B CN 110887166B CN 201811054001 A CN201811054001 A CN 201811054001A CN 110887166 B CN110887166 B CN 110887166B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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Abstract
The invention provides a method for detecting refrigerant leakage of an air conditioner and the air conditioner. The detection method for the refrigerant leakage of the air conditioner comprises the following steps of: s1, periodically detecting the operation condition of the refrigerant, and executing step S2 when the detection result shows that the operation parameter of the refrigerant is abnormal; s2, judging the refrigerant leakage risk level, and executing the step S3 when the judgment result shows that the refrigerant leakage risk level is A level or B level; and S3, judging the type of the original refrigerant filled in the air conditioner. By the method and the device, the refrigerant leakage risk can be found in time, the refrigerant leakage risk grade is judged, and the type of the originally filled refrigerant is judged before the refrigerant is replenished and poured.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method for detecting refrigerant leakage of an air conditioner and the air conditioner.
Background
With the improvement of living standard of people, the popularization rate of the air conditioner is higher and higher, and the maintenance of the air conditioner is correspondingly frequent in the face of the large-area popularization of the air conditioner. In which, after the air conditioner is used for a long time, the refrigerant leakage problem may occur. The refrigerant leakage of the air conditioner causes problems in that firstly, the temperature adjusting capability of the air conditioner is deteriorated, and a user finds a problem and seeks maintenance after the air conditioner is operated for a long time in a state where the refrigerant is broken down. At this time, since the refrigerant leakage failure is likely to have caused serious risks and problems such as damage to the compressor, damage to the piping, etc., the maintenance cost of the air conditioner may be increased and the lifespan of the air conditioner may be shortened.
In addition, air conditioners are available in various types, and the type of refrigerant to be filled is also different. Although those skilled in the art have recognized that if an error occurs in the type of refrigerant filled into the air conditioner, the air conditioner may have poor cooling effect and broken or damaged pipelines, in the prior art, it is generally required to determine whether the type of the filled refrigerant matches the type of the originally filled refrigerant according to the relevant operating parameters of the air conditioner during operation after the refrigerant filling is completed. That is to say, in the method for determining the type of refrigerant in the prior art, the refrigerant is generally filled into a refrigerant circulation pipeline of the air conditioner, then the air conditioner is operated, and after the air conditioner is operated for a certain time, whether the type of the filled refrigerant is consistent with the type of the refrigerant originally filled before the air conditioner leaves a factory is determined by detecting a temperature or pressure parameter. This has a problem that refilling is required when the type of the refrigerant to be filled is determined to be wrong, thereby increasing the time cost and the economic cost for maintenance. Therefore, it is important to provide a method capable of determining the type of the refrigerant in advance before refilling the refrigerant.
However, although seemingly simple, the two steps of refrigerant replenishment and refrigerant type determination in the prior art cannot be simply and arbitrarily adjusted in sequence. This is because, the fluctuation and shortage of the refrigerant residual amount affect the operation parameters such as the temperature and the pressure of the air conditioner, so that the prior art cannot provide an effective and accurate method for determining the refrigerant type when the refrigerant residual amount is insufficient, but must determine the refrigerant type and perform an error alarm by operating the air conditioner after performing the replenishment, that is, the prior art can only perform the alarm after the replenishment error, and cannot perform the preliminary determination of the original refrigerant filling type before the replenishment.
Disclosure of Invention
In view of the above, the present invention is directed to a method for detecting a refrigerant fault of an air conditioner and an air conditioner thereof, so as to solve the technical problems in the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a detection method for air conditioner refrigerant leakage comprises the following steps:
s1, periodically detecting the operation condition of the refrigerant, and executing step S2 when the detection result shows that the operation parameter of the refrigerant is abnormal;
s2, judging the refrigerant leakage risk level, and executing the step S3 when the judgment result shows that the refrigerant leakage risk level is A level or B level;
and S3, judging the type of the original refrigerant filled in the air conditioner.
Further, in step S1, the refrigerant operation status is periodically detected according to the first pressure parameter P1, the second pressure parameter P2 and the first temperature parameter T1; the first pressure parameter P1 is the pressure at the outlet of the compressor of the air conditioner when the air conditioner is in a high-low pressure balance state; the second pressure parameter P2 is the pressure at the outlet of the compressor of the air conditioner when the air conditioner is in a steady operation state; the first temperature parameter T1 is a temperature at an outlet of a heat exchanger of an indoor unit of the air conditioner when the air conditioner is in a steady operation state.
Further, in step S2, calculating a refrigerant allowance percentage η according to a refrigerant density ρ at an outlet of a compressor of an outdoor unit of the air conditioner, a second temperature parameter T2, and a third temperature parameter T3 when the air conditioner is in a stable operation state, and determining a refrigerant leakage risk level according to the refrigerant allowance percentage η; the second temperature parameter T2 and the third temperature parameter T3 are the temperature at the air outlet of the indoor unit of the air conditioner and the outdoor ambient temperature when the air conditioner is in a stable operation state, respectively.
Further, in step S3, a type of the refrigerant to be originally filled in the air conditioner is determined based on the first pressure parameter P1 and the refrigerant density ρ.
Further, step S1 includes the following sub-steps:
s1-1, before the air conditioner is started to operate, acquiring the first pressure parameter P1;
s1-2, starting the air conditioner to operate in a refrigeration mode, and acquiring the second pressure parameter P2 and the first temperature parameter T1 after the operation state of the air conditioner is stable;
s1-3, judging whether the first pressure parameter P1 is smaller than a first pressure parameter threshold P1Threshold(s)If yes, go to step S1-4;
s1-4, judging whether the second pressure parameter P2 is larger than a second pressure parameter threshold P2Threshold(s)(ii) a When the judgment result is positiveIf yes, go to step S1-5;
s1-5, judging whether the first temperature parameter T1 is larger than a first temperature parameter threshold value T1Threshold(s)(ii) a And judging that the refrigerant operation parameters are abnormal when the judgment result is yes.
Further, step S2 includes the following sub-steps:
s2-1, starting the air conditioner, adjusting the set temperature of the air conditioner to a refrigeration standard set temperature, and testing the density rho of the refrigerant;
s2-2, testing the second temperature parameter T2 and the third temperature parameter T3;
s2-3, calculating the refrigerant allowance percentage eta according to the refrigerant density rho, the second temperature parameter T2 and the third temperature parameter T3, and judging the refrigerant leakage risk level according to the refrigerant allowance percentage eta;
the refrigerant allowance percentage eta is calculated by the following formula:
rho is the refrigerant density rhoSign boardThe initial standard refrigerant density is obtained by inquiring an initial standard refrigerant density matrix table according to the second temperature parameter T2 and the third temperature parameter T3.
Further, step S3 includes the following sub-steps:
s3-1, calculating a corrected pressure P according to the first pressure parameter P1 and the refrigerant allowance percentage etaCompared with；
S3-2, searching for a pressure at saturation equal to the corrected pressure PCompared withUnder the condition of (1), saturation temperatures Ts1 and Ts2 … … Tsn respectively corresponding to various refrigerants R1 and R2 … … Rn;
s3-3, respectively calculating temperature difference values of | Ts1-T3|, | Ts2-T3| … … | Tsn-T3| between the saturation temperatures Ts1 and Ts2 … … Tsn and the third temperature parameter T3;
s3-4, respectively judging whether the temperature difference value | Ts1-T3|, | Ts2-T3| … … | Tsn-T3| is lower than a set temperature difference threshold value delta TThreshold(s)；
S3-5, obtaining a value delta T lower than the set temperature difference threshold valueThreshold(s)Searching for a target refrigerant Rx corresponding to the target temperature difference value | Tsx-T3| and judging that the target refrigerant Rx is a refrigerant originally filled in the air conditioner.
Further, the initial standard refrigerant density matrix table is established by the following steps before the air conditioner leaves a factory, and is stored in a calculation unit of the air conditioner in advance:
A. starting the air conditioner, and adjusting the set temperature of the air conditioner to the refrigeration standard set temperature;
B. the outer ring temperature and the inner ring temperature are respectively regulated and controlled manually;
C. sequentially testing and recording the temperature of the outer ring as TOuter a，TOuter b，TOuter c……TOuter mAnd inner ring temperature TInner x，TInner y，TInner z……TInner nUnder the condition, the air conditioner has the initial standard refrigerant density rho at the outlet of the compressor of the outdoor unit under the conditions of sufficient refrigerant, no leakage and no faultSign boardAnd obtaining the initial standard refrigerant density matrix table.
Further, in step S2-3, when the refrigerant residual percentage η is 0% to 30%, it is determined that the refrigerant leakage risk level is level a; when the refrigerant allowance percentage eta is 31-80%, judging that the refrigerant leakage risk grade is grade B; and when the refrigerant allowance percentage eta is 81-100%, judging that the refrigerant leakage risk grade is grade C.
The air conditioner adopts the detection method for detecting the insufficient refrigerant of the air conditioner.
By the method and the device, the refrigerant leakage risk can be found in time, the refrigerant leakage risk grade is judged, and the type of the originally filled refrigerant is judged before the refrigerant is replenished and poured. Specifically, compared with the prior art, the method for detecting the refrigerant fault of the air conditioner has the following advantages:
firstly, the invention can realize the detection of the operation condition of the refrigerant only by arranging a pressure sensor at the outlet of the compressor of the air conditioner and arranging a temperature sensor at the outlet of the heat exchanger of the indoor unit of the air conditioner, has less parameters to be detected, and ensures the accuracy of the detection result by repeatedly checking the pressure or temperature parameters at the same position. And secondly, the air conditioner performs different processing modes according to different refrigerant risk grades by detecting the operating parameters of the air conditioner and judging the refrigerant leakage risk grade according to the calculated refrigerant allowance percentage, so that the air conditioner is effectively protected. Finally, the invention provides a method for comprehensively judging the original refrigerant filling types by combining the running condition of the air conditioner, the environmental influence and related parameters, which improves the accuracy of judgment, can judge the original refrigerant filling types when the refrigerant is leaked or the allowance is insufficient, and avoids the problems of environmental pollution and economic and time cost waste caused by the fact that the refrigerant types need to be detected after the refrigerant is filled and the wrong refrigerant needs to be released for refilling after the refrigerant is filled incorrectly in the prior art.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a first flowchart of a method for detecting refrigerant leakage of an air conditioner according to an embodiment of the present invention;
fig. 2 is a second flowchart of a method for detecting refrigerant leakage of an air conditioner according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, an embodiment of the present invention provides a method for detecting refrigerant leakage of an air conditioner, which specifically includes the following steps:
s1, the operation condition of the refrigerant is periodically detected, when the judgment result of the step S1 shows that the operation parameter of the refrigerant is not abnormal, the normal operation of the air conditioner is kept, and when the judgment result of the step S1 shows that the operation parameter of the refrigerant is abnormal, the step S2 is executed to further judge the leakage risk level.
And S2, judging the refrigerant leakage risk level. The method comprises the steps of detecting relevant operation parameters of the air conditioner, and accurately calculating the refrigerant allowance according to the operation parameters, so that the refrigerant leakage risk level is judged, and a basis is provided for maintenance personnel during fault repair and refrigerant refilling. And executing step S3 when the refrigerant leakage risk level is class a or class B.
And S3, judging the type of the original filling refrigerant, and detecting the type of the original filling refrigerant in advance before supplementing the filling refrigerant so as to avoid the degradation of refrigeration effect and other potential safety hazards caused by the inconsistency of the types of the front and back filling refrigerants.
The reason why the refrigerant leakage detection is performed in steps S1 to S3 is that: in step S1, the parameter abnormality during the operation of the air conditioner can be timely found by periodically detecting the operation status of the refrigerant. Except that the refrigerant leakage is checked and judged in time. The refrigerant surplus is calculated in step S2, so that the refrigerant leakage risk level is determined, and different alarm prompts or protective measures are performed for different risk levels. Through step S2, on the basis of timely finding out the refrigerant leakage fault, the air conditioner can be prevented from being seriously damaged by capacitance damage, compressor fault and the like caused by long-term operation under the working conditions of serious shortage and leakage of the refrigerant, and insufficient filling or waste is avoided for providing a numerical basis of refrigerant demand before the refrigerant is refilled. In addition, the type of the original filling refrigerant is determined in step S3, so that the type of the refrigerant replenished by the maintenance staff and the type of the original filling refrigerant are consistent. Compared with the prior art that the judgment is carried out according to the running parameters of the air conditioner under the condition of sufficient refrigerant after the refrigerant is fully filled, the embodiment of the invention can combine the running condition of the air conditioner, the environmental influence and the related parameters through the step S3, and carry out the pre-judgment on the filling type of the original refrigerant before the supplement and the filling, thereby improving the judgment accuracy, and avoiding the problems of environmental pollution and economic and time cost waste caused by the fact that the refrigerant type needs to be detected after the refrigerant is fully filled and the wrong refrigerant needs to be released for re-filling after the refrigerant is wrongly filled in the prior art.
The detection and determination manner and principle of each step S1 to S3 will be described in detail with reference to fig. 2.
The step S1 is to periodically perform a check for the risk of refrigerant leakage, and the step S1 may be periodically performed every three to six months according to the selection of a person skilled in the art. If refrigerant faults cannot be found in time, huge potential safety hazards and high maintenance cost are caused, but the time and economic cost of users are also consumed for arranging contact of maintenance personnel to carry out on-site maintenance. Therefore, the step S1 of the embodiment of the present invention is not only to perform periodic detection on the operation condition of the refrigerant, but also to provide a fast and accurate periodic detection implemented by repeated verification of a small number of parameters.
In step S1, it is determined whether the refrigerant operation condition is abnormal or not according to the first pressure parameter P1, the second pressure parameter P2, and the first temperature parameter T1. Wherein the first pressure parameter P1 is the pressure at the outlet of the compressor of the air conditioner when the air conditioner is in the high-low pressure balance state, which is measured by a pressure sensor. The second pressure parameter P2 is the pressure at the outlet of the compressor of the air conditioner when the air conditioner is in a steady operation state, measured by a pressure sensor. The first temperature parameter T1 is a temperature at an outlet of a heat exchanger of an indoor unit of the air conditioner when the air conditioner is in a steady operation state.
Specifically, step S1 includes the following substeps:
s1-1, before the air conditioner is started to operate, acquiring the first pressure parameter P1.
S1-2, starting the air conditioner to operate in a cooling mode, and acquiring the second pressure parameter P2 and the first temperature parameter T1 after the operating state of the air conditioner is stable.
S1-3, judging whether the first pressure parameter P1 is smaller than a first pressure parameter threshold P1Threshold(s)When the judgment result is yes, step S1-4 is performed.
S1-4, judge instituteWhether the second pressure parameter P2 is greater than a second pressure parameter threshold P2Threshold(s)(ii) a When the judgment result is yes, step S1-5 is performed.
S1-5, judging whether the first temperature parameter T1 is larger than a first temperature parameter threshold value T1Threshold(s)(ii) a And if so, judging that the operation condition of the refrigerant is abnormal. And when the judgment conclusion is that the refrigerant operation condition is abnormal, performing further refrigerant leakage risk judgment through step S2.
If the test results of step S1-3 and step S1-4 indicate that the first pressure parameter P1 is less than the first pressure parameter threshold P1Threshold(s)And the second pressure parameter P2 is greater than the second pressure parameter threshold P2Threshold(s)It indicates that the refrigerant charge may be decreasing. However, since different operating environments, different operating parameters, and different operating modes may cause differences in refrigerant distribution conditions in the refrigerant circulation pipeline each time the air conditioner is shut down, after the preliminary comparison according to the pressure parameters is performed through steps S1-3 and S1-4, further comparison and judgment according to the temperature parameters through step S1-5 are required, so as to determine whether an abnormality actually exists.
Wherein the first pressure parameter threshold P1Threshold(s)The second pressure parameter threshold value P2Threshold(s)And the first temperature parameter threshold T1Threshold(s)The air conditioner is a fixed value preset before the air conditioner leaves the factory, and the numerical value can be designed and adjusted by a person skilled in the art. Such as the first pressure parameter threshold P1Threshold(s)Is set to be the first standard pressure P1 at the outlet of the compressor of the air conditioner in a high-low pressure balance state under the conditions of sufficient refrigerant, no leakage and no fault of the air conditionerSign board80% or 90%. Setting the second pressure parameter threshold P2Threshold(s)Is set as the second standard pressure P2 at the outlet of the compressor of the air conditioner when the running state of the air conditioner is stable under the conditions of sufficient refrigerant, no leakage and no faultSign board110% or 120%. Setting the first temperature parameter threshold T1Threshold(s)The value of (A) is set to be that the running state of the air conditioner is stable under the conditions of sufficient refrigerant, no leakage and no fault of the air conditionerTiming, standard temperature T1 at the outlet of the heat exchanger of the indoor unit of the air conditionerSign board110% or 120%. The first standard pressure P1Sign boardSecond standard pressure P2Sign boardAnd a standard temperature T1Sign boardAll can be obtained by testing.
Through the steps S1-1 to S1-5, the detection of the operation state of the refrigerant can be realized only by arranging a pressure sensor at the outlet of the compressor of the air conditioner and arranging a temperature sensor at the outlet of the heat exchanger of the indoor unit of the air conditioner, the number of parameters to be detected is small, and the accuracy of the detection result is ensured through multiple times of verification.
The purpose of step S2 is to determine the refrigerant leakage risk level. In step S2, a refrigerant leakage risk level is determined according to the refrigerant density ρ at the outlet of the compressor of the outdoor unit of the air conditioner, the second temperature parameter T2, and the third temperature parameter T3. The second temperature parameter T2 and the third temperature parameter T3 are a temperature at an air outlet of an indoor unit of the air conditioner and an outdoor ambient temperature, respectively.
The reason why step S2 is executed is that different processing methods are required for different degrees of refrigerant leakage. For example, when the refrigerant leakage amount is very small, the air conditioner can be selected to operate normally temporarily without alarming, when the refrigerant leakage amount is further increased, the refrigerant allowance is displayed to a user, when the refrigerant leakage amount is further increased to influence the refrigeration effect, the user is prompted by means of sound and light and the like periodically, when the refrigerant leakage amount reaches the level that other components are possibly damaged, the air conditioner stops operating automatically, and the air conditioner cannot be started to operate before the refrigerant allowance reaches the minimum standard.
Specifically, the method for determining the refrigerant leakage risk in step S2 includes:
s2-1, starting the air conditioner, adjusting the set temperature of the air conditioner to the refrigeration standard set temperature, and testing the density rho of a refrigerant at the outlet of a compressor of an outdoor unit of the air conditioner after the running state of the air conditioner is stable.
S2-2, testing a second temperature parameter T2 and a third temperature parameter T3, wherein the second temperature parameter T2 and the third temperature parameter T3 are the temperature at the air outlet of the indoor unit of the air conditioner and the outdoor environment temperature respectively.
And S2-3, calculating the refrigerant allowance percentage eta according to the refrigerant density rho, the second temperature parameter T2 and the third temperature parameter T3, and judging the refrigerant leakage risk level according to the refrigerant allowance percentage eta.
In step S2-3, the refrigerant residual amount percentage η is calculated by the following formula:
rho is the density of the refrigerant obtained by the test, rhoSign boardThe initial standard refrigerant density is obtained by inquiring an initial standard refrigerant density matrix table according to the second temperature parameter T2 and the third temperature parameter T3.
It should be noted that, under the condition that the refrigerant quality is fixed, the refrigerant density at the outlet of the compressor of the outdoor unit of the air conditioner is different under different conditions of the outer ring temperature, the inner ring temperature and the set temperature. Therefore, before the air conditioner leaves factory, an initial standard refrigerant density matrix table is pre-established, and initial standard refrigerant densities rho corresponding to different outer ring temperatures and inner ring temperatures at the same set temperature are obtainedSign boardTherefore, calculation errors caused by environmental factors are avoided, and the accuracy and the calculation efficiency of calculation are improved.
The initial standard refrigerant density matrix table is established through the following steps before the air conditioner leaves a factory, and is stored in a calculation unit of the air conditioner in advance.
A. And starting the air conditioner, and adjusting the set temperature of the air conditioner to the refrigeration standard set temperature, wherein the specific value of the refrigeration standard set temperature can be selected by a person skilled in the art according to actual conditions, such as 16 ℃, or 20 ℃, or 26 ℃.
B. The outer ring temperature and the inner ring temperature are adjusted and controlled through manual control;
C. sequentially testing and recording the temperature of the outer ring as TOuter a，TOuter b，TOuter c……TOuter mAnd inner ring temperature TInner x，TInner y，TInner z……TInner nUnder the condition, the air conditioner has the initial standard refrigerant density rho at the outlet of the compressor of the outdoor unit under the conditions of sufficient refrigerant, no leakage and no faultSign boardThe initial standard refrigerant density matrix table, for example, table 1, is obtained.
Establishing the initial standard refrigerant density matrix table through the steps a to C, and querying the initial standard refrigerant density ρ corresponding to the second temperature parameter T2 and the third temperature parameter T3 by using the initial standard refrigerant density matrix table in step S2-3Sign boardAnd the method is used for calculating the refrigerant allowance percentage eta. For example, when the second temperature parameter T2 is equal to TInner xSaid third temperature parameter T3 being equal to TOuter aAnd inquiring the initial standard refrigerant density matrix table to obtain the initial standard refrigerant density rhoSign boardIs equal to rhoMark ax。
TABLE 1
In step S2-3:
when the refrigerant allowance percentage eta is 0-30%, judging that the refrigerant leakage risk level is A level;
when the refrigerant allowance percentage eta is 31-80%, judging that the refrigerant leakage risk grade is grade B;
and when the refrigerant allowance percentage eta is 81-100%, judging that the refrigerant leakage risk grade is grade C.
In step S2-3:
when the refrigerant leakage risk level is level A, the air conditioner executes the step S3, and the air conditioner stops running after the execution is finished;
when the refrigerant leakage risk level is B level, the air conditioner executes the step S3, and after the execution is finished, the air conditioner displays and outputs the refrigerant allowance percentage eta;
and when the refrigerant leakage risk grade is grade C, the air conditioner keeps normal operation.
The purpose of step S3 is to detect the type of refrigerant originally filled in advance before the refrigerant is replenished. The reason why step S3 is implemented is that: when the air conditioner reaches a high-low pressure balance state after shutdown and stop running for a certain time, at this time, the saturation temperature Ts of the refrigerant approaches to the outer ring temperature, that is, the third temperature parameter T3. Under the same saturation temperature Ts, the saturation pressure values corresponding to different types of refrigerants are different, and the relationship between the saturation pressure values and the saturation temperatures is in one-to-one correspondence. Therefore, the type of the refrigerant can be determined by the above principle. The problem that the refrigerant type is judged in advance before the refrigerant is replenished and filled is that the refrigerant pressure parameter changes due to the fact that the refrigerant is insufficient, and the refrigerant pressure parameter continuously changes along with the continuous reduction of the refrigerant allowance, and therefore the technical problem that the refrigerant type is difficult to detect in advance before the refrigerant is replenished and filled by adopting the corresponding relation between the saturation pressure and the saturation temperature is brought. In order to solve the above problem, step S3 calibrates the pressure parameter using the remaining refrigerant quantity percentage η obtained in step S2, thereby determining the type of the refrigerant in a state where the remaining refrigerant quantity is insufficient.
Specifically, step S3 includes the following substeps:
s3-1, calculating a corrected pressure P according to the first pressure parameter P1 obtained in the step S1 and the refrigerant margin percentage eta obtained in the step S2 according to the following formulaCompared with＝η×P1。
S3-2, searching for a pressure at saturation equal to the corrected pressure PCompared withUnder the condition (1), saturation temperatures Ts1 and Ts2 … … Tsn respectively correspond to the refrigerants R1 and R2 … … Rn.
S3-3, respectively calculating temperature difference values | Ts1-T3|, | Ts2-T3| … … | Tsn-T3| of the saturation temperatures Ts1 and Ts2 … … Tsn and the third temperature parameter T3 obtained in the step S2;
s3-4, respectively judging whether the temperature difference value | Ts1-T3|, | Ts2-T3| … … | Tsn-T3| is lower than a set temperature difference threshold value delta TThreshold(s)Said set temperature difference threshold value DeltaTThreshold(s)Has a value range of 1℃-3℃；
S3-5, obtaining a value delta T lower than the set temperature difference threshold valueThreshold(s)Searching for a target refrigerant Rx corresponding to the target temperature difference value | Tsx-T3| and judging that the target refrigerant Rx is a refrigerant originally filled in the air conditioner.
The embodiment of the invention is illustrated by four air conditioner refrigerants, namely R134a, R22, R407c and R410a, which are commonly found in the market at present. The saturation temperatures corresponding to different types of refrigerants under different saturation pressure conditions can be obtained by those skilled in the art by looking up the prior art. Table 2 shows saturation temperatures Ts of four air conditioner refrigerants R134a, R22, R407c and R410a under different saturation pressures.
For example, the set temperature difference threshold Δ TThreshold(s)Set to 3 ℃, in step S3-1, the first pressure parameter P1 obtained in step S1 is 700kpa, and the refrigerant residual amount percentage η obtained in step S2 is 80%, according to the formula PCompared withCalculating to obtain the corrected pressure P ═ eta × P1Compared withIs 560 kpa.
In step S3-2, the saturation temperatures Ts1 and Ts2 … … Tsn corresponding to the respective types of refrigerants R1 and R2 … … Rn under the condition that the saturation pressure is equal to the correction pressure P is searched. Under the condition that the saturation pressure is equal to 560kpa of the corrected pressure P, the saturation temperatures TsR134a, TsR22, TsR407c and TsR410a corresponding to the refrigerants R134a, R22, R407c and R410a are respectively 19.3 ℃, 3.7 ℃, 0.4 ℃ and 10.7 ℃.
In step S3-3, the third temperature parameter T3 acquired through step S2 is 20 ℃. The saturation temperature TsR a, TsR22, TsR407c, TsR410a and the temperature difference value | TsR a-T3|, | TsR22-T3|, | TsR407c-T3|, | TsR410a-T3|, respectively, of the saturation temperature TsR, TsR22, TsR407c, TsR410a and the third temperature parameter T3 are 0.7 ℃, 16.3 ℃, 20.4 ℃ and 30.7 ℃, the temperature difference value | TsR134a-T3| corresponding to the refrigerant R134a is 0.7 ℃, and the value is smaller than the set temperature difference threshold Δ TThreshold(s)And 3 ℃, so that the refrigerant originally filled in the air conditioner can be judged to be R134 a.
TABLE 2
It should be noted that the temperature parameter according to the embodiment of the present invention is obtained by a temperature sensor test. The temperature sensor can be realized by adopting a temperature sensor which is commonly used in the technical field of air conditioners in the prior art and can sense temperature and convert temperature information into a usable output signal, and the embodiment of the invention is not limited. The refrigerant pressure parameter is obtained by testing a pressure sensor, and the pressure sensor is a pressure sensor which is commonly used in the technical field of air conditioners in the prior art and can sense pressure and convert pressure information into a usable output signal. The density of the refrigerant is obtained by testing a density sensor, the density sensor adopts a density sensor which can test the liquid density and convert the liquid density information into a usable output signal in the prior art, such as a resonant liquid density sensor, a vibrating tube type liquid density sensor, an ultrasonic density sensor, a capacitance type liquid density sensor and the like, and the density test purpose in the invention can be realized. The calculation process of the embodiment of the invention can be performed by software and a corresponding general hardware platform, such as a computer software product with calculation and comparison functions stored in a storage medium such as a ROM/RAM, a magnetic disk, an optical disk, and the like. Finally, it should also be noted that, in the embodiments of the present invention, relational terms such as first, second, third, fourth, and the like are used solely to separate one entity or operation or parameter value from another entity or operation region or parameter value without necessarily requiring or implying any actual relationship or order between such entities or operations or parameter values.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A detection method for air conditioner refrigerant leakage is characterized by comprising the following steps:
s1, periodically detecting the operation condition of the refrigerant, and executing step S2 when the detection result shows that the operation parameter of the refrigerant is abnormal;
s2, judging the refrigerant leakage risk level, and executing the step S3 when the judgment result shows that the refrigerant leakage risk level is A level or B level;
s3, judging the type of the original refrigerant filled in the air conditioner;
in step S1, periodically detecting the operation status of the refrigerant according to the first pressure parameter P1, the second pressure parameter P2 and the first temperature parameter T1; the first pressure parameter P1 is the pressure at the outlet of the compressor of the air conditioner when the air conditioner is in a high-low pressure balance state; the second pressure parameter P2 is the pressure at the outlet of the compressor of the air conditioner when the air conditioner is in a steady operation state; the first temperature parameter T1 is the temperature at the outlet of a heat exchanger of an indoor unit of the air conditioner when the air conditioner is in a stable operation state;
in step S2, calculating a refrigerant allowance percentage η according to a refrigerant density ρ at an outlet of a compressor of an outdoor unit of the air conditioner, a second temperature parameter T2, and a third temperature parameter T3 when the air conditioner is in a stable operation state, and determining a refrigerant leakage risk level according to the refrigerant allowance percentage η; the second temperature parameter T2 and the third temperature parameter T3 are the temperature at the air outlet of the indoor unit of the air conditioner and the outdoor ambient temperature when the air conditioner is in a stable operation state, respectively;
in step S3, determining a type of an original refrigerant filled in the air conditioner according to the first pressure parameter P1 and the refrigerant density ρ;
step S3 includes the following substeps:
s3-1, calculating a corrected pressure P according to the first pressure parameter P1 and the refrigerant allowance percentage etaCompared with；
S3-2, searching for a pressure at saturation equal to the corrected pressure PCompared withUnder the condition of (1), the various refrigerants R1 and R2 … … Rn are respectively corresponding to saturationTemperatures Ts1, Ts2 … … Tsn;
s3-3, respectively calculating temperature difference values of | Ts1-T3|, | Ts2-T3| … … | Tsn-T3| between the saturation temperatures Ts1 and Ts2 … … Tsn and the third temperature parameter T3;
s3-4, respectively judging whether the temperature difference value | Ts1-T3|, | Ts2-T3| … … | Tsn-T3| is lower than a set temperature difference threshold value delta TThreshold(s)；
S3-5, obtaining a value delta T lower than the set temperature difference threshold valueThreshold(s)Searching a target refrigerant Rx corresponding to the target temperature difference value | Tsx-T3| and judging that the target refrigerant Rx is a refrigerant originally filled in the air conditioner;
wherein, PCompared with＝η×P1。
2. The method for detecting refrigerant leakage of an air conditioner as claimed in claim 1, wherein: step S1 includes the following substeps:
s1-1, before the air conditioner is started to operate, acquiring the first pressure parameter P1;
s1-2, starting the air conditioner to operate in a refrigeration mode, and acquiring the second pressure parameter P2 and the first temperature parameter T1 after the operation state of the air conditioner is stable;
s1-3, judging whether the first pressure parameter P1 is smaller than a first pressure parameter threshold P1Threshold(s)If yes, go to step S1-4;
s1-4, judging whether the second pressure parameter P2 is larger than a second pressure parameter threshold P2Threshold(s)(ii) a If yes, go to step S1-5;
s1-5, judging whether the first temperature parameter T1 is larger than a first temperature parameter threshold value T1Threshold(s)(ii) a And judging that the refrigerant operation parameters are abnormal when the judgment result is yes.
3. The method for detecting refrigerant leakage of an air conditioner as claimed in claim 1, wherein: step S2 includes the following substeps:
s2-1, starting the air conditioner, adjusting the set temperature of the air conditioner to a refrigeration standard set temperature, and testing the density rho of the refrigerant;
s2-2, testing the second temperature parameter T2 and the third temperature parameter T3;
s2-3, calculating the refrigerant allowance percentage eta according to the refrigerant density rho, the second temperature parameter T2 and the third temperature parameter T3, and judging the refrigerant leakage risk level according to the refrigerant allowance percentage eta;
the refrigerant allowance percentage eta is calculated by the following formula:
rho is the refrigerant density rhoSign boardThe initial standard refrigerant density is obtained by inquiring an initial standard refrigerant density matrix table according to the second temperature parameter T2 and the third temperature parameter T3.
4. The method for detecting refrigerant leakage of an air conditioner according to claim 3, wherein the initial standard refrigerant density matrix table is established by the following steps before the air conditioner leaves a factory, and is pre-stored in a computing unit of the air conditioner:
A. starting the air conditioner, and adjusting the set temperature of the air conditioner to the refrigeration standard set temperature;
B. the outer ring temperature and the inner ring temperature are respectively regulated and controlled manually;
C. sequentially testing and recording the temperature of the outer ring as TOuter a，TOuter b，TOuter c……TOuter mAnd inner ring temperature TInner x，TInner y，TInner z……TInner nUnder the condition, the air conditioner has the initial standard refrigerant density rho at the outlet of the compressor of the outdoor unit under the conditions of sufficient refrigerant, no leakage and no faultSign boardAnd obtaining the initial standard refrigerant density matrix table.
5. The method for detecting refrigerant leakage of an air conditioner as claimed in claim 3, wherein: in step S2-3, when the refrigerant residual percentage η is 0% to 30%, it is determined that the refrigerant leakage risk level is level a; when the refrigerant allowance percentage eta is 31-80%, judging that the refrigerant leakage risk grade is grade B; and when the refrigerant allowance percentage eta is 81-100%, judging that the refrigerant leakage risk grade is grade C.
6. An air conditioner, characterized in that the air conditioner adopts the method for detecting the refrigerant leakage of the air conditioner as claimed in any one of claims 1 to 5.
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| CN112361528A (en) * | 2020-11-09 | 2021-02-12 | 珠海格力电器股份有限公司 | Control method and control device of air conditioner, storage medium and processor |
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