CN110887168B - Air conditioner refrigerant shortage detection method and air conditioner - Google Patents
Air conditioner refrigerant shortage detection method and air conditioner Download PDFInfo
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- CN110887168B CN110887168B CN201811053915.3A CN201811053915A CN110887168B CN 110887168 B CN110887168 B CN 110887168B CN 201811053915 A CN201811053915 A CN 201811053915A CN 110887168 B CN110887168 B CN 110887168B
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Abstract
The invention provides a method for detecting insufficient refrigerant of an air conditioner and the air conditioner. The method for detecting the insufficient refrigerant of the air conditioner comprises the following steps: s1, judging whether a refrigerant filled in the air conditioner is sufficient, and if the judgment result is insufficient, executing a step S2; s2, judging the type of the refrigerant originally filled in the air conditioner; s3, filling a refrigerant into a refrigerant circulating pipeline of the air conditioner; step S1 is periodically executed at every other detection cycle. The invention can compare and judge more accurately and quickly. Through the query of the pre-stored matrix table, the process of comparing a plurality of data is simplified, and the accuracy of detection is also improved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method for detecting insufficient refrigerant 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. After the air conditioner is used for a long time, the problem of refrigerant failure caused by insufficient refrigerant allowance or pipeline breakage can occur. The refrigerant failure 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 of refrigerant failure. At this time, since the refrigerant failure is likely to cause 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 method for detecting insufficient refrigerant of an air conditioner comprises the following steps:
s1, judging whether a refrigerant filled in the air conditioner is sufficient, and if the judgment result is insufficient, executing a step S2;
s2, judging the type of the refrigerant originally filled in the air conditioner;
s3, filling a refrigerant into a refrigerant circulating pipeline of the air conditioner;
step S1 is periodically executed at every other detection cycle.
Further, in step S1, it is determined whether the refrigerant filled in the air conditioner is sufficient according to a first pressure parameter P1, a second pressure parameter P2, a first temperature parameter T1, a second temperature parameter T2, and a third temperature parameter T3; wherein the first pressure parameter P1 and the second pressure parameter P2 are the pressure at the outlet of the compressor of the air conditioner when the air conditioner is in a high-low pressure balance state and the pressure at the outlet of the compressor of the air conditioner when the air conditioner is in a steady operation state, respectively; the first temperature parameter T1 is a temperature at an outlet of a heat exchanger of an indoor unit of the air conditioner, and the second temperature parameter T2 and the third temperature parameter T3 are an inner ring temperature and an outer ring temperature, respectively.
Further, in step S2, determining a type of refrigerant originally filled in the air conditioner according to the first pressure parameter P1, the second temperature parameter T2, the third temperature parameter T3, and the refrigerant density ρ; the refrigerant density ρ is a density of a refrigerant at an outlet of a compressor of an outdoor unit of the air conditioner.
Further, step S1 includes the following sub-steps:
s1-1, after the time for the air conditioner to continuously keep the shutdown state reaches a first preset time, acquiring the first pressure parameter P1;
s1-2, determine whether the first pressure parameter P1 is greater than or equal to a first pressure parameter threshold P1Threshold(s)If the judgment result is negative, executing the step S1-3;
s1-3, starting the air conditioner, adjusting the set temperature of the air conditioner to the set temperature of the refrigeration standard, and operating in the refrigeration mode for a second preset time to obtain the first temperature parameter T1;
s1-4, acquiring the second temperature parameter T2 and the third temperature parameter T3;
s1-5, acquiring a first temperature parameter threshold T1Threshold(s)Judging the first temperatureWhether a degree parameter T1 is greater than the first temperature parameter threshold T1Threshold(s)(ii) a When the first temperature parameter T1 is greater than the first temperature parameter threshold T1Threshold(s)Executing the step S1-6;
s1-6, acquiring a second pressure parameter threshold P2Threshold(s)Determining whether the second pressure parameter P2 is greater than the second pressure parameter threshold P2Threshold(s)(ii) a When the second pressure parameter P2 is greater than the second pressure parameter threshold P2Threshold(s)Step S2 is executed;
further, step S2 includes the following sub-steps:
s2-1, 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;
s2-2, respectively calculating temperature difference values of | Ts1-T3|, | Ts2-T3| … … | Tsn-T3| of the saturation temperatures Tsl and Ts2 … … Tsn and the third temperature parameter T3;
s2-3, respectively judging whether the temperature difference value | Ts1-T3|, | Ts2-T3| … … | Tsn-T3| is lower than a set temperature difference threshold value, wherein the value range of the set temperature difference threshold value is 1-3 ℃;
s2-4, obtaining a target temperature difference value | Tsx-T3| with the numerical value lower than the set temperature difference threshold, searching a target refrigerant Rx corresponding to the target temperature difference value | Tsx-T3| and judging that the target refrigerant Rx is the refrigerant originally filled in the air conditioner.
Further, in step S1-5, the first temperature parameter threshold T1Threshold(s)Obtained by the following formula:
is a first proportional constant
The value range of (A) is 0.5-0.8; t1Sign boardThe temperature of the inner ring and the like under the conditions of sufficient refrigerant, no fault and no leakageAnd when the second temperature parameter T2 and the outer ring temperature are equal to the third temperature parameter T3, the air conditioner is at the standard temperature at the outlet of the heat exchanger of the indoor unit in the stable operation state.
Further, in step S1-6, the second pressure parameter threshold P2Threshold(s)Obtained by the following formula:
is a second proportionality constant, the second proportionality constant
Has a value range of 1.0-1.2, P2Sign boardIn order to ensure that the standard pressure at the outlet of the compressor of the air conditioner is in a stable operation state when the temperature of the outer ring is equal to the third temperature parameter T3 under the conditions of sufficient refrigerant, no fault and no leakage.
Further, in step S2-1, the corrected pressure PCompared withObtained by the following formula: pCompared withB is a refrigerant density correction coefficient, P1 is the first pressure parameter, and ρ is the refrigerant density.
Further, the refrigerant density correction coefficient B is obtained by calculating according to the following formula:
is a third proportionality constant, said third proportionality constant
The value range of (1) is 0.8-1.2, rhoSign boardIn order to ensure that the temperature of the inner ring is equal to the second temperature parameter T2 and the temperature of the outer ring is equal to the third temperature parameter T3 under the conditions of sufficient refrigerants, no faults and no leakage, the air conditioner is in a stable operation stateThe standard refrigerant density of (c).
The air conditioner adopts the detection method for detecting the insufficient refrigerant of the air conditioner.
Compared with the prior art, the method for detecting the refrigerant fault of the air conditioner has the following advantages:
firstly, compared with the prior art that the refrigerant state of the air conditioner is fitted through a curve or a formula, the corresponding relation between the refrigerant state of the air conditioner and the relation between a plurality of temperature, pressure and power parameters is established, and therefore whether the refrigerant is insufficient or not is evaluated. The invention can compare and judge more accurately and quickly. The method has the advantages that errors caused by curve or formula fitting are avoided, multiple times of calculation comparison are avoided, a scheme that in the prior art, multiple variables are firstly obtained, fitting parameters are determined according to the multiple variables, and finally calculation or comparison is carried out is converted into a method for judging insufficient refrigerant, wherein the method only adopts a single temperature parameter to be compared with a standard temperature parameter threshold value, detection errors caused by environment changes are corrected through the first temperature parameter threshold value matrix table, the process of comparing multiple data is simplified, and the accuracy of detection is also improved. Secondly, the invention can accurately judge the type of the originally filled refrigerant in advance before the refrigerant is supplemented and filled, thereby saving the time cost and the economic cost of maintenance.
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 a refrigerant shortage of an air conditioner according to an embodiment of the present invention;
fig. 2 is a second flowchart of a method for detecting a refrigerant shortage 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 insufficient refrigerant of an air conditioner, which specifically includes the following steps:
s1, judging whether a refrigerant filled in the air conditioner is sufficient, if so, keeping the air conditioner to normally operate, and if not, executing a step S2;
s2, judging the type of the refrigerant originally filled in the air conditioner;
and S3, filling a refrigerant into the refrigerant circulating pipeline of the air conditioner according to the judgment result of the step S2.
Step S1 is periodically executed at every other detection cycle. Whether the refrigerant is sufficient or not is periodically detected, the fault of insufficient refrigerant is timely found, and the serious damage of the air conditioner, such as capacitor damage, compressor fault and the like caused by long-term operation under the working condition of insufficient refrigerant is avoided.
The manner and principle of the test and judgment of each step S1 to S3 will be described in detail with reference to fig. 2.
In step S1, it is determined whether the refrigerant filled in the air conditioner is sufficient by: and judging whether the refrigerant filled in the air conditioner is sufficient or not according to the first pressure parameter P1, the second pressure parameter P2, the first temperature parameter T1, the second temperature parameter T2 and the third temperature parameter T3.
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 the temperature at the outlet of the heat exchanger of the indoor unit of the air conditioner. The second temperature parameter T2 and the third temperature parameter T3 are inner ring temperature and outer ring temperature, respectively. The inner ring temperature refers to the temperature at the air outlet of the indoor unit of the air conditioner. The outer ring temperature refers to an outdoor ambient temperature of the air conditioner when operating.
Specifically, step S1 includes the following substeps:
s1-1, when the air conditioner is in a high-low pressure balance state, acquiring the first pressure parameter P1. And after the time for continuously keeping the air conditioner in the shutdown state reaches or exceeds a first preset time, the air conditioner is determined to reach a high-low pressure balance state. The first predetermined time may be selected and adjusted by one skilled in the art.
S1-2 judges whether or not the first pressure parameter P1 is greater than or equal to a first pressure parameter threshold P1Threshold(s). And if so, indicating that the refrigerant in the refrigerant circulating pipeline of the air conditioner is insufficient in allowance and needs to be maintained or filled. If the result of the determination is negative, it indicates that the current test result and the obtained data are not sufficient to determine whether the refrigerant is insufficient, and further determination is required through step S1-3 and subsequent steps. Wherein the first pressure parameter threshold P1Threshold(s)Is a fixed value preset before the air conditioner leaves the factory, and the first pressure parameter threshold value P1Threshold(s)Can be designed and adjusted by those skilled in the art, such as the first pressure parameter threshold value P1Threshold(s)Is set to be the standard pressure P1 at the outlet of the compressor of the air conditioner in the high-low pressure balance state under the conditions of sufficient refrigerant, no leakage and no fault of the air conditionerSign board80% or 90%. That is, upon detection that the first pressure parameter P1 is lower than the standard pressure P1Sign boardThe pressure parameter is abnormal at the time of 80% or 90%, and the refrigerant can be insufficient.
S1-3, starting the air conditioner, adjusting the set temperature of the air conditioner to the set temperature of the refrigeration standard, and operating in the refrigeration mode for a second preset time to obtain the first temperature parameter T1. After the air conditioner is started to operate, when the air conditioner operates for the second preset time, the operation of the air conditioner reaches a stable state, and at the moment, the test is started, so that the test error caused by unstable operation state when the air conditioner is started initially is avoided. The second predetermined time is greater than 3 minutes, preferably, the second predetermined time is greater than 6 minutes, and further preferably, the second predetermined time is 6 to 8 minutes.
S1-4 obtains the second temperature parameter T2 and the third temperature parameter T3.
S1-5, obtaining a first temperature parameter threshold T1 according to the second temperature parameter T2 and the third temperature parameter T3Threshold(s)Judging whether the first temperature parameter T1 is larger than a first temperature parameter threshold value T1Threshold(s). When the first temperature parameter T1 is less than or equal to the first temperature parameter threshold T1Threshold(s)And judging the sufficiency of the refrigerant. When the first temperature parameter T1 is greater than the first temperature parameter threshold T1Threshold(s)If the refrigerant may be insufficient, step S1-6 is executed to perform further determination.
It should be noted that, under different conditions of the outer ring temperature, the inner ring temperature, and the set temperature, the operating state of the air conditioner and various parameters in the operating process are different. Therefore, the first temperature parameter threshold T1Threshold(s)The magnitude of the value of (a) is influenced by the outer ring temperature, the inner ring temperature and the set temperature when the air conditioner is operated. The purpose of step S1-5 is to determine whether the first temperature parameter T1 is greater than the first temperature parameter threshold T1Threshold(s)To further determine whether the refrigerant is sufficient. Therefore, the embodiment of the invention provides the first temperature parameter threshold value T1 of the air conditioner under different environments by establishing the first temperature parameter threshold value matrix tableThreshold(s)The influence of environmental factors on the judgment result is reduced or eliminated, and the accuracy of the judgment result is further improved.
The first temperature parameter threshold value matrix table is established and used in the following way in consideration of environmental factors. Before the air conditioner leaves a factory, a first temperature parameter threshold value matrix table is established in advance, and the first temperature parameter threshold value matrix table is stored in a calculation unit of the air conditioner. The first temperatureParameter threshold T1Threshold(s)The magnitude of the value of (a) is influenced by the outer ring temperature, the inner ring temperature and the set temperature when the air conditioner is operated. Since the set temperature of the air conditioner is adjusted to the cooling standard set temperature through the step S1-3, at this time, the second temperature parameter T2 and the third temperature parameter T3 are tested, that is, the current inner ring temperature and the current outer ring temperature are known, and then the corresponding first temperature parameter threshold T1 in the first temperature parameter threshold matrix table under the conditions of the current inner ring temperature and the current outer ring temperature is searchedThreshold(s)So as to adopt said first temperature parameter threshold T1Threshold(s)The comparison is made in step S1-5.
For example, the set temperature of the air conditioner is set to be 18 ℃ as the standard set temperature of refrigeration, the outer ring temperature and the inner ring temperature are adjusted by manual control under the condition that the refrigerant is not leaked or insufficient, and the outer ring temperatures are respectively set at T under the condition that the set temperature of the air conditioner is always 18 ℃ as shown in table 1Outer a，TOuter b，TOuter c……TOuter mAnd inner ring temperature at TInner partx，TInner party，TInner partz……TInner partn conditions of the first temperature parameter threshold matrix table. According to the second temperature parameter T2 and the third temperature parameter T3, the first temperature parameter threshold T1 is obtained by inquiring a first temperature parameter threshold matrix table pre-stored in the air conditionerThreshold(s)The numerical value of (c). The specific value of the refrigeration standard set temperature can be selected by those skilled in the art according to actual conditions, such as 16 ℃, or 20 ℃, or 26 ℃, so as to obtain other first temperature parameter threshold value matrix tables.
TABLE 1
Wherein the first temperature parameter threshold value matrix table is obtained by: under the premise of sufficient refrigerant, no fault and no leakage, the temperature of the outer ring is controlledRespectively at TOuter a，TOuter b，TOuter c……TOuter mAnd inner ring temperature at TInner x，TInner y，TInner z……TInner nUnder each condition of (a), the standard temperature T1 at the outlet of the heat exchanger of the indoor unit of the air conditioner is tested in sequenceSign boardCalculating the first temperature parameter threshold value T1 according to the following formulaThreshold(s): the first temperature parameter threshold
Is a first proportional constant
Adjustment and selection can be made by one skilled in the art. Preferably, the first and second liquid crystal materials are,
in the range of 0.5-0.8, T1Sign boardThe standard temperature is the standard temperature at the outlet of the heat exchanger of the indoor unit of the air conditioner when the refrigerant is sufficient, has no fault and has no leakage, and the temperature of a certain specific inner ring and the temperature of a certain specific outer ring are equal.
By the method, the first temperature parameter threshold value matrix table is established and completed. In step S1-5, obtaining the corresponding first temperature parameter threshold T1 in the first temperature parameter threshold matrix table according to the second temperature parameter T2 and the third temperature parameter T3Threshold(s). For example, when the set temperature of the air conditioner is the cooling standard set temperature of 18 ℃, when the second temperature parameter T2 is equal to TInner xSaid third temperature parameter T3 being equal to TOuter aThe first temperature parameter threshold T1 can be found by looking up the first temperature parameter threshold matrix tableThreshold(s)Equal to T1Threshold ax. Subsequently, it is determined whether the first temperature parameter T1 is greater than the first temperature parameter threshold T1Threshold(s)。
Compared to by curves or formulasFitting, and establishing the corresponding relation between the air conditioner refrigerant state and a plurality of temperature, pressure and power parameter relations. The embodiment of the invention can more accurately and quickly compare and judge. Firstly, errors caused by curve or formula fitting are avoided, multiple times of calculation comparison is avoided, and the first temperature parameter threshold value T1 can be accurately obtained only by inquiring a pre-stored matrix tableThreshold(s)Therefore, the scheme that firstly a plurality of variables are obtained in the prior art, then the fitting parameters are determined according to the variables, and finally the calculation or comparison is carried out is converted into the scheme that only a single temperature parameter is adopted to be compared with the standard temperature parameter threshold value, so that the detection error caused by the environmental change is corrected through the first temperature parameter threshold value matrix table, the comparison process is simplified, and the accuracy of detection is also improved.
S1_6, according to the third temperature parameter T3, obtaining a first temperature parameter threshold T1Threshold(s)Judging whether the second pressure parameter P2 is greater than a second pressure parameter threshold P2Threshold(s). When the second pressure parameter P2 is less than or equal to the second pressure parameter threshold P2Threshold(s)And judging the sufficiency of the refrigerant. When the second pressure parameter P2 is greater than the second pressure parameter threshold P2Threshold(s)If the refrigerant is insufficient, step S2 is executed to determine the type of refrigerant originally filled in the air conditioner.
It should be noted that, in the embodiment of the present invention, the second pressure parameter threshold P2Threshold(s)The change is made according to different outer ring temperatures and set temperatures. According to the embodiment of the invention, the influence of environmental factors on the judgment result is reduced or eliminated by establishing the second pressure parameter threshold value matrix table, and the accuracy of the judgment result is further improved.
The second pressure parameter threshold matrix table is constructed and used in the following manner in consideration of environmental factors. And pre-establishing a second pressure parameter threshold value matrix table before the air conditioner leaves a factory, and storing the second pressure parameter threshold value matrix table in a calculation unit of the air conditioner. Since the set temperature of the air conditioner is adjusted to the cooling reference set temperature by the step S1-3, this isThen, the third temperature parameter T3 is tested, i.e. the current outer ring temperature is known, and then the corresponding second pressure parameter threshold P2 in the second pressure parameter threshold matrix table under the current condition is searchedThreshold(s)For comparison in step S1-6.
For example, the set temperature of the air conditioner is fixedly set to 18 ℃ as the refrigeration standard set temperature, the outer ring temperature is adjusted through manual control on the premise that the refrigerant is sufficient, has no fault and no leakage, and the outer ring temperature is respectively at T under the condition that the set temperature of the air conditioner is always 18 DEG COuter a，TOuter b，TOuter c……TOuter mSaid second pressure parameter threshold value P2 under conditionsThreshold(s)Value of P2Threshold a，P2Threshold b，P2Threshold c……P2Threshold m. Wherein the second pressure parameter threshold P2Threshold(s)The numerical value of (a) is obtained by: on the premise of sufficient refrigerant, no fault and no leakage, the temperature of the outer ring is respectively TOuter a，TOuter b，TOuter c……TOuter mUnder each condition, sequentially testing a second pressure parameter standard value P2 of the air conditionerSign boardSaid second standard value of pressure parameter P2Sign boardThe standard pressure is the standard pressure at the outlet of the compressor of the air conditioner when the air conditioner is in a stable operation state under the conditions of sufficient refrigerant, no fault and no leakage under the conditions of a refrigeration standard set temperature and a certain fixed outer ring temperature. Calculating the second pressure parameter threshold P2 according to the following equationThreshold(s): the second pressure parameter threshold
Is a second proportionality constant, the second proportionality constant
Adjustment and selection can be made by one skilled in the art. Preferably, the first and second liquid crystal materials are,
the numerical range of (A) is 1.0 to 1.2. And establishing and finishing the second pressure parameter threshold value matrix table by the method. When the set temperature of the air conditioner is 18 ℃ in use, for example, when the third temperature parameter T3 is equal to TOuter aThe second pressure parameter threshold value P2 can be found by inquiryThreshold(s)Is equal to P2Threshold aWherein, in the step (A),
therefore, when the outer ring temperature is the third temperature parameter T3, the corresponding second pressure parameter threshold P2 is obtainedThreshold(s)The numerical value of (c).
In the embodiment of the present invention, the reason why the determination of whether the refrigerant filled in the air conditioner is sufficient through the steps S1-1 to S1-6 is that: step S1 is periodically executed, so steps S1-1 to S1-6 are required to verify the check result multiple times, and the subsequent steps are executed only if the results of the multiple times are insufficient. This is because if refrigerant failure is not found in time, the potential safety hazard may be caused, but it also takes time and economic cost for the user to arrange to contact maintenance personnel for maintenance, so it is necessary to ensure that the determination result of step S1 is very accurate. Compared with the step of repeatedly testing and checking through multiple types of parameters in the prior art, the steps S1-1 to S1-6 of the embodiment of the invention can obtain an accurate judgment conclusion by only carrying out value taking twice on the pressure at the same position and then carrying out measurement on the inner ring temperature, the outer ring temperature and the temperature of the heat exchanger of the indoor unit once, thereby avoiding the complex testing process and the cost increase caused by installing multiple testing components. In summary, the verification performed in different manners can be realized for several times through the testing and detection of a small number of parameters in the steps S1-1 to S1-6, so as to output a more accurate judgment result.
In step S2, the type of refrigerant originally filled in the air conditioner is determined by the following method: and judging the type of the refrigerant filled in the air conditioner according to the first pressure parameter P1, the second temperature parameter T2, the third temperature parameter T3 and the density rho of the refrigerant. And the refrigerant density rho is the density of the refrigerant at the outlet of the compressor of the outdoor unit of the air conditioner, which is obtained by a density sensor.
Step S2 includes the following substeps:
s2-1, 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;
s2-2, 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;
s2-3, respectively judging whether the temperature difference value | Ts1-T3|, | Ts2-T3| … … | Tsn-T3| is lower than a set temperature difference threshold value, wherein the value range of the set temperature difference threshold value is 1-3 ℃;
s2-4, obtaining a target temperature difference value | Tsx-T3| with the numerical value lower than the set temperature difference threshold, searching a target refrigerant Rx corresponding to the target temperature difference value | Tsx-T3| and judging that the target refrigerant Rx is the refrigerant originally filled in the air conditioner.
Step S2 utilizes the principle that: when the air conditioner reaches the high-low pressure balance state, the saturation temperature Ts of the refrigerant is close to the outer ring temperature TOuter coverI.e. said 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, in step S2, a refrigerant density parameter that can be directly measured is combined with a temperature parameter to calibrate the relationship between the temperature and the pressure of the refrigerant under different air conditioner operating parameters and different refrigerant allowance conditions. The specific embodiment is as follows.
TABLE 2
There are several types of refrigerants of air conditioners that are currently common in the market, and the embodiment of the present invention will be described in detail by taking four types of common refrigerants, i.e., R134a, R22, R407c, and R410a, as examples. Table 2 shows the four refrigerants of R134a, R22, R407c and R410a at different corrected pressures PCompared withThe lower corresponding saturation temperature Ts. Wherein the correction pressure PCompared withThe correction is performed according to the first pressure parameter P1, the second temperature parameter T2, the third temperature parameter T3 and the refrigerant density ρ obtained through testing, and a specific correction method will be described below. It should be noted that table 2 only shows the saturation temperatures at some pressure values, and it is within the ability of one skilled in the art to obtain the corresponding saturation temperatures at other pressure values according to table 2.
For example, when tested and calculated corrected pressure PCompared withThe value of (a) is 600kpa, the third temperature parameter T3 obtained by the test is 22 ℃, and since the third temperature parameter T3, namely the outer ring temperature is equal to or close to the refrigerant saturation temperature, the correction pressure P is inquired at the momentCompared withWhen the value of (A) is 600kpa, the saturation temperature Ts corresponding to the four refrigerants R134a, R22, R407c and R410aR134a、TsR22、TsR407c、TsR410aRespectively at 21.6 deg.C, 5.9 deg.C, 1.8 deg.C and-8.7 deg.C. Obviously, the saturation temperature Ts corresponding to the refrigerant R134aR134aThe temperature of 21.6 ℃ is closest to the temperature of 22 ℃ of the third temperature parameter T3, so that the refrigerant originally filled in the air conditioner can be judged to be R134 a.
As described above, the correction pressure PCompared withIs based on the first pressure parameter P1, the second temperature parameter T2, the third temperature obtained by testingThe degree parameter T3 and the refrigerant density rho are obtained after correction. In particular, the correction pressure PCompared withB × P1 × ρ, where P1 is the first pressure parameter, ρ is the refrigerant density, and B is a refrigerant density correction coefficient. The refrigerant density correction coefficient B is obtained by combining the standard refrigerant density ρ' of the air conditioner with the second temperature parameter T2 and the third temperature parameter T3. The standard refrigerant density rho' is a known quantity and can be obtained by dividing the total quantity of the refrigerant filled before the air conditioner leaves the factory by the total volume of the refrigerant circulating pipeline.
Under the condition that the quality of the refrigerant is fixed, the density of the refrigerant at the outlet of a compressor of an outdoor unit of the air conditioner is different under the conditions of different outer ring temperatures, inner ring temperatures and set temperatures. Therefore, before the air conditioner is shipped from a factory, a refrigerant density correction coefficient matrix table is established in advance.
For example, the refrigeration standard set temperature of the air conditioner is set to 18 ℃, the outer ring temperature and the inner ring temperature are adjusted by manual control on the premise of sufficient refrigerant, no fault and no leakage, and the outer ring temperature is respectively set to be at T under the condition that the set temperature of the air conditioner is always 18 ℃ as shown in table 3Outer a，TOuter b，TOuter c……TOuter mAnd inner ring temperature at TInner x，TInner y，TInner z……TInner nAnd (5) a matrix table of refrigerant density correction coefficients B under the conditions. The specific value of the refrigeration standard set temperature can be selected by those skilled in the art according to actual conditions, such as 16 ℃, or 20 ℃, or 26 ℃.
TABLE 3
The refrigerant density correction coefficient matrix table is obtained by the following method: at an outer ring temperature of TOuter a，TOuter b，TOuter c……TOuter mAnd inner ring temperature at TInner x，TInner y，TInner z……TInner nUnder each condition of (a), sequentially testing the standard refrigerant density rho at the outlet of the compressor of the outdoor unit of the air conditionerSign board. The refrigerant density correction coefficient B is obtained by the following formula: the refrigerant density correction coefficient
Is a third proportionality constant, said third proportionality constant
Adjustment and selection can be made by one skilled in the art. Preferably, the first and second liquid crystal materials are,
the value of (A) is in the range of 0.8 to 1.2, preferably 1.0.
For example, selecting
Is 0.9, said second temperature parameter T2 obtained by testing is equal to TInner xSaid third temperature parameter T3 being equal to TOuter aThe temperature of the inner ring is T and is obtained by testing before the air conditioner leaves a factoryInner xThe outer ring temperature is TOuter aStandard refrigerant density rho under the conditions ofMark axAt this time, the refrigerant density correction coefficient Bax＝0.9/ρMark ax。
Because the refrigerant density correction coefficient BaxIs pre-stored in the air conditioner, and can be queried according to the second temperature parameter T2 (i.e. inner ring temperature) and the third temperature parameter T3 (i.e. outer ring temperature) to obtain the refrigerant density correction coefficient B under the conditions of the inner and outer ambient temperaturesaxThen, can pass through formula PGreater than＝BaxX P1 x P obtaining the corrected pressure PCompared withThe corrected pressure P can then be learned by looking up a pressure-temperature relationship table such as Table 2Compared withAt the third temperatureNumber T3 is the closest saturation temperature.
In addition, due to the existence of the test error, a slight error exists between the third temperature parameter T3 obtained by the test and the saturation temperature of the original perfusion refrigerant, and the embodiment of the invention can reduce the influence of the test error by the following method.
Respectively inquired at the corrected pressure PCompared withUnder the condition, saturation temperatures Ts1 and Ts2 … … Tsn corresponding to different refrigerants R1 and R2 … … Rn; 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; respectively judging whether the temperature difference value | Ts1-T3|, | Ts2-T3| … … | Tsn-T3| is lower than a set temperature difference threshold, wherein the set temperature difference threshold can be 1 ℃ or 2 ℃ or 3 ℃; when the comparison shows that any one of the temperature difference values | Ts1-T3|, | Ts2-T3| … … | Tsn-T3|, for example, the value of | Tsx-T3| is lower than the set temperature difference threshold value, the refrigerant Rx corresponding to the saturation temperature Tsx is judged to be the refrigerant originally filled in the air conditioner.
After the type of the refrigerant originally filled in the air conditioner is determined in step S2, the maintenance worker may fill the refrigerant into the refrigerant circulation line of the air conditioner according to the determination result of step S2 in step S3. The method for filling the refrigerant can be performed by a refrigerant filling method in the prior art, and the invention is not described herein again.
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 method for detecting insufficient refrigerant of an air conditioner is characterized by comprising the following steps:
s1, judging whether a refrigerant filled in the air conditioner is sufficient, and if the judgment result is insufficient, executing a step S2;
s2, judging the type of the refrigerant originally filled in the air conditioner;
s3, filling a refrigerant into a refrigerant circulating pipeline of the air conditioner;
wherein, every other detection period, step S1 is executed periodically;
in step S1, determining whether the refrigerant filled in the air conditioner is sufficient according to a first pressure parameter P1, a second pressure parameter P2, a first temperature parameter T1, a second temperature parameter T2 and a third temperature parameter T3; wherein the first pressure parameter P1 and the second pressure parameter P2 are the pressure at the outlet of the compressor of the air conditioner when the air conditioner is in a high-low pressure balance state and the pressure at the outlet of the compressor of the air conditioner when the air conditioner is in a steady operation state, respectively; the first temperature parameter T1 is a temperature at an outlet of a heat exchanger of an indoor unit of the air conditioner, and the second temperature parameter T2 and the third temperature parameter T3 are an inner ring temperature and an outer ring temperature, respectively;
in step S2, determining a type of refrigerant originally filled in the air conditioner according to the first pressure parameter P1, the second temperature parameter T2, the third temperature parameter T3, and the refrigerant density ρ; the refrigerant density ρ is a density of a refrigerant at an outlet of a compressor of an outdoor unit of the air conditioner;
step S2 includes the following substeps:
s2-1, 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;
s2-2, 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;
s2-3, respectively judging whether the temperature difference value | Ts1-T3|, | Ts2-T3| … … | Tsn-T3| is lower than a set temperature difference threshold value, wherein the value range of the set temperature difference threshold value is 1-3 ℃;
s2-4, obtaining a target temperature difference value | Tsx-T3| with the numerical value lower than the set temperature difference threshold value, searching a target refrigerant Rx corresponding to the target temperature difference value | Tsx-T3| and judging that the target refrigerant Rx is the refrigerant originally filled in the air conditioner;
in step S2-1, the correction pressure PCompared withObtained by the following formula: pCompared withB is a refrigerant density correction coefficient, P1 is the first pressure parameter, and ρ is the refrigerant density.
2. The method for detecting a refrigerant shortage of an air conditioner as claimed in claim 1, wherein the step S1 includes the following substeps:
s1-1, after the time for the air conditioner to continuously keep the shutdown state reaches a first preset time, acquiring the first pressure parameter P1;
s1-2, determine whether the first pressure parameter P1 is greater than or equal to a first pressure parameter threshold P1Threshold(s)If the judgment result is negative, executing the step S1-3;
s1-3, starting the air conditioner, adjusting the set temperature of the air conditioner to the set temperature of the refrigeration standard, and operating in the refrigeration mode for a second preset time to obtain the first temperature parameter T1;
s1-4, acquiring the second temperature parameter T2 and the third temperature parameter T3;
s1-5, acquiring a first temperature parameter threshold T1Threshold(s)Determining whether the first temperature parameter T1 is greater than the first temperature parameter threshold T1Threshold(s)(ii) a When the first temperature parameter T1 is greater than the first temperature parameter threshold T1Threshold(s)Executing the step S1-6;
s1-6, acquiring a second pressure parameter threshold P2Threshold(s)Determining whether the second pressure parameter P2 is greater than the second pressure parameter threshold P2Threshold(s)(ii) a When the second pressure parameter P2 is greater than the second pressure parameter threshold P2Threshold(s)Step S2 is executed.
3. The method as claimed in claim 2, wherein the first temperature parameter threshold value T1 is set at step S1-5Threshold(s)Obtained by the following formula:
is a first proportional constant
The value range of (A) is 0.5-0.8; t1Sign boardWhen the temperature of the inner ring is equal to the second temperature parameter T2 and the temperature of the outer ring is equal to the third temperature parameter T3 under the conditions of sufficient refrigerant, no fault and no leakage, the air conditioner is stableStandard temperature at the heat exchanger outlet of the indoor unit in the operating state.
4. The method as claimed in claim 2, wherein the second pressure parameter threshold P2 is set as the threshold in step S1-6Threshold(s)Obtained by the following formula:
is a second proportionality constant, the second proportionality constant
Has a value range of 1.0-1.2, P2Sign boardIn order to ensure that the standard pressure at the outlet of the compressor of the air conditioner is in a stable operation state when the temperature of the outer ring is equal to the third temperature parameter T3 under the conditions of sufficient refrigerant, no fault and no leakage.
5. The method for detecting refrigerant shortage of an air conditioner as claimed in claim 1, wherein the refrigerant density correction factor B is obtained by calculating according to the following formula:
is a third proportionality constant, said third proportionality constant
The value range of (1) is 0.8-1.2, rhoSign boardWhen the refrigerant is sufficient, has no fault and has no leakage, the temperature of the inner ring is equal to the second temperature parameter T2, and the temperature of the outer ring is equal to the third temperature parameter T3, the standard refrigerant density at the outlet of the compressor of the outdoor unit is the air conditioner in the stable operation state.
6. An air conditioner, characterized in that the air conditioner adopts the method for detecting the refrigerant shortage of the air conditioner as claimed in any one of claims 1 to 5.
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