CN110857803B - Refrigerant leakage detection method and air conditioner with same - Google Patents

Abstract

The invention provides a refrigerant leakage detection method and an air conditioner with the same, wherein the detection method comprises the following steps: ST 1: starting the air conditioner, performing initial detection on refrigerant leakage, and judging whether the compressor can be started normally; ST 2: judging whether the compressor can normally operate or not; ST 3: judging whether a preset triggering condition for detecting refrigerant leakage is met; ST 4: judging whether the refrigerant leaks or not according to the triggering condition of the refrigerant leakage; ST 5: and executing the refrigerant leakage protection operation. The refrigerant leakage detection method avoids resource waste and program complexity through detection judgment of whether the compressor can be started and detection judgment of whether the compressor is normal, ensures that detection data in the process of detecting refrigerant leakage is real and reliable in the follow-up process, and can greatly reduce the probability of misjudgment through adopting multi-factor triggering and then the refrigerant leakage detection program based on the triggering condition.

Description

Refrigerant leakage detection method and air conditioner with same

Technical Field

The invention relates to the technical field of air conditioners, in particular to a refrigerant leakage detection method and an air conditioner with the same.

Background

With the progress of the current society and the development of economy, the air conditioner is taken as an important electrical appliance in daily life of people and has gone into thousands of households.

The existing air-conditioning refrigeration system comprises a compressor, an outdoor heat exchanger, a throttling device, an indoor heat exchanger, a certain amount of refrigerant which is filled in advance and the like. And under the condition that the refrigerant is not leaked, the air conditioning system can normally perform refrigeration operation. However, in the installation process and the long-term use process of the air conditioner, the pipeline may be damaged due to poor sealing performance, bending, long-term corrosion or other external insurability, and the air conditioner refrigerant may leak. Fundamentally, the refrigerant leakage is reflected in the reduction of refrigerant flow, the performance of the air conditioner is reduced due to the insufficient refrigerant flow, the compressor is enabled to run under the poor condition, and the compressor is even damaged in the severe condition.

Most of the existing technologies adopt a temperature sensor or a pressure sensor to detect whether a refrigerant leaks or not, when the refrigerant leakage is detected, an air conditioner sends a protection instruction to stop the whole machine from running, but the air conditioning system is easy to misjudge in the process of starting running to running stability or under the working condition of high temperature and high humidity, and the accuracy of the air conditioner in judging the refrigerant leakage is influenced.

The applicant has started a technical study on the prevention of leakage of refrigerant of an air conditioner in the early stage and filed a related patent including the steps of: a. recording the temperature T of the indoor coil before the compressor is started; b. judging whether the compressor is started, if so, carrying out the next step, otherwise, returning to the step a; c. judging whether the compressor continuously runs for x minutes, if so, performing the next step, otherwise, returning to the step b; d. recording the indoor coil temperature T' and the simultaneous indoor temperature T when the compressor is running for x minutes_r(ii) a e. Calculating the temperature difference between the indoor coil temperature T 'when the compressor continuously operates for x minutes and the indoor coil temperature T before the compressor starts, and calculating the indoor coil temperature T' when the compressor continuously operates for x minutes and the indoor temperature T at the same time_rJudging whether the two temperature differences are smaller than y or not, if so, entering the step f, otherwise, resetting the running time of the compressor and returning to the step b; f. and (5) stopping the machine and reporting faults. With further research on refrigerant leakage prevention of the air conditioner by the applicant, the technical scheme in the application is found that the error judgment phenomenon is easy to occur in the specific implementation process, especially in certain specific use environments, and the accuracy of the judgment of refrigerant leakage by the air conditioner is influenced.

Therefore, a reliable, safe, fast and accurate refrigerant leakage detection method is a technical problem to be solved urgently by those skilled in the art.

Disclosure of Invention

In view of this, the present invention is directed to a method for detecting refrigerant leakage and an air conditioner having the same, so as to solve the problem that an air conditioning system in the prior art is prone to misjudge refrigerant leakage, and improve the accuracy of the air conditioner in judging refrigerant leakage.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a refrigerant leakage detection method comprises a refrigerant loop, detectable additives are added into the refrigerant loop, the additives are relatively inert gas mixtures, a detection device is arranged outside the refrigerant loop and used for detecting the concentration of the additives outside the refrigerant loop and feeding back the concentration to a controller, and the controller runs a corresponding control program according to a detection result and a pre-stored relation, wherein the detection method comprises the following steps:

ST 1: starting the air conditioner, performing initial detection on refrigerant leakage, and judging whether the compressor can be started normally;

ST 2: judging whether the compressor can normally operate or not;

ST 3: judging whether a preset triggering condition for detecting refrigerant leakage is met;

ST 4: judging whether the refrigerant leaks or not according to the triggering condition of the refrigerant leakage;

ST 5: and executing the refrigerant leakage protection operation.

Further, the step ST3 of determining whether the preset triggering condition for detecting refrigerant leakage is satisfied includes determining four layers of triggering conditions as follows:

ST31, compressor running time t₁Triggering the compressor operating power F_rReliable frequency value F preset with compressor_RComparing the judgment conditions to obtain a preliminary judgment result, judging the judgment result to be normal, entering ST32, and otherwise entering STR;

ST32, compressor Pre-run frequency f₀Pre-run t₂Time, detect the current indoor unit coil temperature T_P2And indoor temperature T_N2According to the pre-stored relation, obtaining a secondary judgment result, if the judgment is normal, entering ST33, otherwise entering STR;

ST33, compressor at high frequency f₁Operation t₃Detecting the pressure of the compressor suction pipe, obtaining a third judgment result according to a pre-stored relation, if the judgment result is normal, entering ST34, otherwise entering STR;

ST34, compressor at low frequency f₂Operation t₅Time, again detecting the current indoor unit coil temperature T_P3And indoor temperature T_N3Obtaining four judgment results according to a pre-stored relation, if the judgment result is normal, entering ST35, otherwise entering STR;

ST35, the refrigerant is not leaked, and the air conditioner normally operates;

and if entering the STR, adding 1 to the counter, operating the STR1, executing ST4, executing a pre-stored relation based on the reading of the counter, and judging whether the refrigerant leaks.

Further, in ST1, the method includes the following steps:

ST11, starting the air conditioner;

ST12, detecting the concentrations of M additive components outside a refrigerant loop, wherein M is more than or equal to 2 and is an integer;

ST13, judging whether the concentrations of the M additive components all satisfy the corresponding C_i＞C_{Preparation of}Otherwise, go to ST14, if not, go to ST 15;

ST14, compressor start, ST 2;

ST15, refrigerant leaks, the air conditioner does not work, and the tertiary leakage fault prompt message is sent out.

Further, in ST2, the method includes the following steps:

ST21, compressor running time t₁；

ST22, obtaining the detection information including the actual operation frequency F of the compressor at the time_rMeasuring and obtaining actual specific suction volume U of compressor_{Real suction}Actual specific volume of exhaust gas U_{Solid row}Obtaining the operation mode Q of the air conditioner and the current outdoor temperature T_W1Current indoor temperature T_N1Indoor unit coil temperature T_P1And the concentration C of at least one additive_i1；

ST23, obtaining the operation mode Q and the current outdoor temperature T by table lookup_W1Standard suction specific volume U of compressor_{Label suction}Standard specific volume of exhaust gas U_{Standard row}；

ST24, judgment | U_{Label suction}–U_{Real suction}I and I U_{Standard row}–U_{Solid row}If the ratio of | is smaller than m, m is a preset value, if yes, the ST26 is entered, and if not, the ST25 is entered;

ST25, the compressor is normal, ST3 is entered;

ST26, exit the refrigerant detection program, and prompt the compressor fault information.

Further, in ST31, the method includes the following steps:

ST31a, setting counter to 0, looking up table to obtain current T_W1Reliable frequency value F preset by compressor under temperature_R；

ST31b, determine whether F_R-A＜F_r＜F_RMAXIf yes, entering ST31c, if no, entering STR;

ST31c, the refrigerant does not leak, enter ST 32;

STR, the counter reading is incremented by 1, and STR1 is run.

Further, in ST32, the method includes the following steps:

ST32a, search Q, T_W1、T_N1Corresponding compressor pre-operating frequency f₀Controlling the compressor according to f₀Carrying out air conditioner pre-operation;

ST32b, run t₂Time, obtaining the current indoor unit coil temperature T_P2And indoor temperature T_N2；

ST32c, determine whether | T_P2–T_P1|＜d₁And | T_P2–T_N2|＜d₂If yes, entering STR, otherwise, entering ST32 d;

ST32d, the refrigerant does not leak, enter ST 33;

STR, the counter reading is incremented by 1, and STR1 is run.

Further, in ST33, the method includes the following steps:

ST33a, controlling the compressor to frequency f₁Operation f₁＝nf₀And f is₁Not more than the maximum operating frequency f of the compressor_maxN is a preset value, and n is more than 1;

ST33b, air Conditioning operation t₃Time, obtaining compressor suction pipe pressure P₁；

ST33c, air Conditioning operation t₄Time, obtaining compressor suction pipe pressure P₂；

ST33d, calculate whether | P₁–P₂If | < Δ P, enter ST33e, if not, enter STR;

ST33e, the refrigerant does not leak, enter ST 34;

STR, the counter reading is incremented by 1, and STR1 is run.

Further, in ST34, the method includes the following steps:

ST34a, controlling the compressor to frequency f₂Operation f₂＝mf₀And the lowest operating frequency f of the compressor_min≤f₂M is a preset value, and 1 > m > 0;

ST34b, air Conditioning operation t₅Time, obtaining the temperature T of the coil pipe of the indoor unit_P3And indoor temperature T_N3；

ST34c, determine whether | T_P3–T_P1|＜d₁And | T_P3–T_N3|＜d₂If yes, entering STR, otherwise, entering ST34 d;

ST34d, the refrigerant is not leaked, and the air conditioner normally operates;

STR, the counter reading is incremented by 1, and STR1 is run.

Further, in ST4, the method includes the following steps:

ST41, STR, obtain the counter value;

ST42, judging whether the reading number of the counter is larger than k, wherein k is a preset positive integer and is larger than 1, if so, entering ST45, and if not, entering ST 43;

ST43, measuring the concentration C of the additive at that time_i2；

ST44, determine whether or not C is present_i2–C_i1＞ΔC_{Preparation of}If yes, go to ST45, if no, go to ST 46;

ST45, refrigerant leakage;

ST46, return to ST 32.

Compared with the prior art, the refrigerant leakage detection method has the following advantages:

(1) the refrigerant leakage detection method avoids resource waste and program complexity through detection judgment of whether the compressor can be started and detection judgment of whether the compressor is normal, ensures that detection data in the process of detecting refrigerant leakage is real and reliable in the follow-up process, and can greatly reduce the probability of misjudgment through adopting multi-factor triggering and then the refrigerant leakage detection program based on the triggering condition.

(2) The refrigerant leakage detection method provided by the invention judges whether the refrigerant is leaked or not by adopting a mode of comprehensive judgment conditions such as multi-level and multi-factor detection, and at least two detection factors are adopted as judgment bases whether the air conditioner can normally run or not whether the refrigerant is leaked or not is judged, so that the judgment accuracy is greatly improved.

Another objective of the present invention is to provide an air conditioner, which adopts the above method for detecting refrigerant leakage.

Compared with the prior art, the air conditioner and the refrigerant leakage detection method have the same advantages, and are not described again.

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 an overall flowchart of a refrigerant leakage detection method according to an embodiment of the present invention;

fig. 2 is a flowchart of ST1 in the refrigerant leakage detection method according to the embodiment of the present invention;

fig. 3 is a flowchart of ST2 in the refrigerant leakage detection method according to the embodiment of the present invention;

fig. 4 is a schematic flow chart of ST3 in the refrigerant leakage detection method according to the embodiment of the present invention;

fig. 5 is a flowchart of ST31 in the refrigerant leakage detection method according to the embodiment of the present invention;

fig. 6 is a flowchart of ST32 in the refrigerant leakage detection method according to the embodiment of the present invention;

fig. 7 is a flowchart of another ST32 in the refrigerant leakage detection method according to the embodiment of the present invention;

fig. 8 is a flowchart of ST33 in the refrigerant leakage detection method according to the embodiment of the present invention;

fig. 9 is a flowchart of ST34 in the refrigerant leakage detection method according to the embodiment of the present invention;

fig. 10 is a flowchart of ST4 in the refrigerant leakage detection method according to the embodiment of the present invention;

fig. 11 is a flowchart of ST5 in the refrigerant leakage detection method according to the embodiment of the present invention;

fig. 12 is a flowchart illustrating a method for detecting refrigerant leakage 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 technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus, as would be understood by one of ordinary skill in the art based upon the realization that such combination is not mutually inconsistent or practical to achieve and should not be considered as lacking in the scope of the claims.

Embodiment 1, as shown in fig. 1, the present invention discloses a method for detecting refrigerant leakage, including the steps of:

ST 1: starting the air conditioner, performing initial detection on refrigerant leakage, and judging whether the compressor can be started normally;

ST 2: judging whether the compressor can normally operate or not;

ST 3: judging whether a preset triggering condition for detecting refrigerant leakage is met;

ST 4: judging whether the refrigerant leaks or not according to the triggering condition of the refrigerant leakage;

ST 5: and executing the refrigerant leakage protection operation.

In the method, in order to ensure whether the compressor can be safely started, the refrigerant leakage initial detection is carried out, and the step S2 is carried out to confirm whether the compressor is normal or not so as to ensure the effectiveness of the refrigerant leakage detection; only when the compressor works normally, the data for detecting the refrigerant is real and reliable, but not caused by the fault of the compressor, and meanwhile, accidents caused by refrigerant leakage are avoided; when the compressor is abnormally operated, the abnormal state of the air conditioner is indicated, and the abnormal state needs to be solved, but the refrigerant leakage detection is not carried out.

As an example of the present invention, in ST1, a working fluid flowing through a refrigerant circuit is provided in the refrigerant circuit, a detectable additive is added in the refrigerant circuit, the additive is a fluid in the refrigerant circuit, a detection device is provided outside the refrigerant circuit, the detection device is used for detecting the concentration of the additive outside the refrigerant circuit and feeding the concentration back to a controller, and the controller runs a corresponding control program according to the detection result and a pre-stored relationship.

As an example of the present invention, in the refrigerant circuit, the additive is a relatively inert gas mixture, and may be a mixture of at least two of carbon monoxide, carbon dioxide, nitrogen, helium, argon, krypton, carbonyl sulfide, sulfur dioxide, and nitrogen oxide, and a ratio of the weight of the additive to the weight of the working fluid mixture in the refrigerant circuit ranges from 0.05% to 2%, preferably from 0.3% to 1.2%.

Further, the detection device is one or more detectors integrated into the HVACR system, and when the detectors detect a specific concentration of harmful gas or additive component, the HVACR can ventilate the area (e.g., introduce air from the outside, etc.) under the action of the controller to dilute any harmful gas and ensure the indoor air quality.

After the judgment of ST1, the compressor can be started normally after being qualified, then ST2 is entered to judge whether the compressor is normal, and if the real-time refrigerant program detection is set, the air conditioner will perform refrigerant detection under unnecessary conditions (if no refrigerant leakage occurs, or the detection accuracy is significantly deviated greatly). The unnecessary refrigerant detection not only wastes resources, but also increases the complexity of the program. In order to avoid the problems of refrigerant detection under the above unnecessary conditions, in this specification, only under the normal working condition of the compressor, whether a preset triggering condition for detecting refrigerant leakage is met is determined according to a preset pre-stored relationship, and then whether the refrigerant leakage occurs is determined, and finally, a refrigerant leakage protection operation is executed according to the refrigerant leakage condition.

Preferably, as shown in fig. 4, as an example of the present invention, the determining whether the preset triggering condition for detecting refrigerant leakage is satisfied in ST3 includes determining the following four-layer triggering condition:

ST31, compressor running time t₁Triggering the compressor operating power F_rReliable frequency value F preset with compressor_RComparing the judgment conditions to obtain a preliminary judgment result, judging the judgment result to be normal, entering ST32, otherwise entering STR, and adding 1 to the counter;

ST32, after the preliminary judgment is normal, the compressor runs at the pre-running frequency f₀Pre-run t₂Time, detect the current indoor unit coil temperature T_P2And indoor temperature T_N2According to the pre-stored relation, obtaining a secondary judgment result, if the judgment is normal, entering ST33, otherwise entering STR, and adding 1 to the counter;

ST33, judging the second time to be normal, the compressor is set to high frequency f₁Operation t₃Detecting the pressure of the compressor suction pipe, obtaining a judgment result of three times according to a pre-stored relation, entering ST34 if the judgment is normal, and entering STR if the judgment is not normal, and adding 1 to a counter;

ST34, after the third judgment, the compressor is at low frequency f₂Operation t₄Time, again detecting the current indoor unit coil temperature T_P3And indoor temperature T_N3Obtaining four judgment results according to the pre-stored relation, if the judgment result is normal, entering ST35, otherwise entering STR, and adding 1 to the counter;

ST35, judging the condition is normal four times, wherein the refrigerant is not leaked, and the air conditioner operates normally;

and if the refrigerant enters the STR, the STR1 is operated, ST4 is executed, a prestored relation is executed based on the reading of the counter, and whether the refrigerant leaks or not is judged.

This setting makes, to the air conditioner that the compressor can normally work, when carrying out the refrigerant and reveal the detection, no matter judge that the refrigerant does not reveal, the air conditioner normal operating, still judge that the refrigerant takes place to reveal, all judge through multi-level, multifactor's detection condition, guarantee to reveal the accurate nature that detects. Meanwhile, when the refrigerant leaks, the damage to the compressor is large, so that when the refrigerant leakage detection judgment is carried out, the operation state of the compressor is mainly used as a reference quantity to carry out judgment and analysis, and the operation t is carried out₁Whether or not to reach the reliable frequency value F_RMaking initial judgment and pre-running frequency f₀Two judgments are carried out under the running state, and the frequency f is high₁Three judgments are carried out under the running state, and the frequency f is low₂Judging four times in the running state, judging that the refrigerant is not leaked and the air conditioner can run normally only after all the detection is qualified, otherwise, executing ST4 to doFor the example of the present invention, after the signal of refrigerant leakage detection is triggered, the counter value is incremented by 1, then a pre-stored relationship is executed based on the reading of the counter, whether the refrigerant leaks or not is determined, and if the refrigerant leaks, at least two determinations are performed, so that the probability of erroneous determination can be reduced.

Example 2:

as shown in fig. 2, ST1 includes the following detection steps:

ST11, starting the air conditioner;

ST12, detecting the concentrations of M additive components outside a refrigerant loop, wherein M is more than or equal to 2 and is an integer;

ST13, judging whether the concentrations of the M additive components all satisfy the corresponding C_i＞C_{Preparation of}Otherwise, go to ST14, if not, go to ST 15;

ST14, compressor start, ST 2;

ST15, refrigerant leaks, the air conditioner does not work, and the tertiary leakage fault prompt message is sent out.

In other detection methods, as in example 1, by detecting the concentrations of at least two additive components, interference caused by the components in the room is avoided, and only at least two of the additive components satisfy corresponding preset information, C_{Preparation of}The judgment of ST13 is completed only when the maximum threshold value which can be detected when the refrigerant circuit external additive is not leaked is preset in the storage unit, so that the wrong information prompt caused by the wrong judgment is avoided, and the accuracy of judging whether the compressor can be started or not is improved.

Example 3:

as shown in fig. 3, ST2 includes the following detection steps:

ST21, compressor running time t₁；

ST22, obtaining the detection information including the actual operation frequency F of the compressor at the time_rMeasuring and obtaining actual specific suction volume U of compressor_{Real suction}And actual specific volume of exhaust gas U_{Solid row}Obtaining the operation mode Q of the air conditioner and the current outdoor temperature T_W1Current indoor temperature T_N1Indoor unit coil temperature T_P1And the concentration C of at least one additive_i1；

ST23, obtaining the operation mode Q and the current outdoor temperature T by table lookup_W1Standard suction specific volume U of compressor_{Label suction}And standard specific exhaust gas volume U_{Standard row}；

ST24, judgment | U_{Label suction}–U_{Real suction}I and I U_{Standard row}–U_{Solid row}If the ratio of | is less than m, entering ST26 if the ratio of | is less than m, and entering ST25 if the ratio of | is not less than m;

ST25, the compressor is normal, ST3 is entered;

ST26, exit the refrigerant detection program, and prompt the compressor fault information.

M is less than 3, and m is preferably 0.5-1.5.

Other detection methods as with other embodiments, in ST22 of this embodiment, the acquired detection information can be obtained by the information acquisition module, and the actual operating frequency F of the compressor_rMeasuring and obtaining actual specific suction volume U of compressor_{Real suction}And actual specific volume of exhaust gas U_{Solid row}Obtaining the operation mode Q of the air conditioner and the current outdoor temperature T_W1Current indoor temperature T_N1Indoor unit coil temperature T_P1And the concentration C of at least one additive_i1The information can be obtained by directly judging or calculating the information of the sensor in the field, and is not described in more detail herein, and the standard suction specific volume U of the compressor_{Label suction}Standard specific volume of exhaust gas U_{Standard row}With operating mode Q, current outdoor temperature T_W1The relationship between the compressor and the compressor is set in the storage unit as a pre-stored relationship, the controller can directly call the pre-stored relationship to perform corresponding calculation or judgment according to the detection information, and researches of researchers find that the higher the frequency of the compressor is, the lower the | U_{Label suction}–U_{Real suction}I and I U_{Standard row}–U_{Solid row}The larger the deviation of the specific value of | is, the specific value of m and the actual operating frequency F_rThe pre-stored relation can also be arranged in the storage unit, so that the accuracy of judging whether the compressor has a fault or not is improved, and the secondary damage or the misjudgment of refrigerant leakage caused by the fault of the compressor is avoided.

As the inventionBy operating the compressor t₁After time, t₁The value of 1-3 min is taken, and the setting ensures that the operation mode of the air conditioner and other detection information are more accurate and stable, so that the reliability of information sources is ensured.

Example 4:

as shown in fig. 5, ST31 includes the following detection steps:

ST31a, setting counter to 0, looking up table to obtain current T_W1Reliable frequency value F preset by compressor under temperature_R；

ST31b, determine whether F_R-A＜F_r＜F_RMAXIf yes, entering ST31c, if no, entering STR;

ST31c, the refrigerant does not leak, enter ST 32;

STR, the counter reading is incremented by 1, and STR1 is run.

Other detection as well as other embodiments, as an example of the present invention, the preset relation is stored in the storage unit, and the outdoor environment temperature T of the outdoor unit of the air conditioning system can be detected by a temperature sensor or an environment temperature sensing bulb arranged in the outdoor unit of the air conditioning system_WAfter obtaining the outdoor ambient temperature T_WThen, the reliable frequency value F of the compressor corresponding to the temperature value is found by looking up the table_R. It can be seen that the outdoor ambient temperature T_WReliable frequency value F of compressor_RThe one-to-one correspondence relationship is preset before leaving the factory, and as an optimization, considering the feasibility of frequency adjustment of the compressor, generally, a reliable frequency value F of one compressor is corresponding to an outdoor environment temperature value interval_R，F_RMAXWhen the refrigerant is not leaked, the maximum value of the reliable frequency value preset by the compressor can cause the reliable frequency value F of the compressor along with the increase of the total operation time of the air conditioner, the natural loss of the refrigerant, the self loss of various devices of the air conditioner and other factors_RIs gradually reduced, and therefore a natural constant A is set, which varies with the total operating time, for the value of the reliable frequency F of the compressor_RThe adjustment is carried out, and the one-to-one corresponding relation between A and the total running time is preset before leaving factoryThe total operation time length of the air conditioner and the time length of each operation are recorded by a timer.

In the present embodiment, the compressor operation time is made to reach t₁The running frequency of the compressor and the reliable frequency value F of the preset compressor at the current outdoor temperature_RAnd comparing the detection result with the preset detection result to obtain a comparison result, wherein the comparison result is used as an initial judgment for detecting a refrigerant leakage triggering condition, the initial judgment for judging whether the refrigerant leaks is carried out when the air conditioner starts the compressor for normal detection, and the refrigerant leakage detection is started only when the pre-stored relation is not met, so that the detection redundancy is avoided on one hand, the misjudgment caused by single detection or the same detection factor is also avoided on the other hand, and the accuracy of the detection method is further improved.

Example 5:

as shown in fig. 6, ST32 includes the following detection steps:

ST32a, search Q, T_W1、T_N1Corresponding compressor pre-operating frequency f₀Controlling the compressor according to f₀Carrying out air conditioner pre-operation;

ST32b, run t₂Time, detecting to obtain current indoor machine coil temperature T_P2And indoor temperature T_N2；

ST32c, determine whether | T_P2–T_P1|＜d₁And | T_P2–T_N2|＜d₂If yes, entering STR, otherwise, entering ST32 d;

ST32d, the refrigerant does not leak, enter ST 33;

STR, the counter reading is incremented by 1, and STR1 is run.

As an example of the present invention, the current operation mode Q may be a preset mode or an operation mode selected by a user, where the preset mode includes an operation mode before the air conditioner is turned off last time and a preset operation mode set by the user; specifically, if the user actively sets an operation mode or a pre-operation mode when the air conditioner is started, the current operation mode Q is the operation mode or the pre-operation mode set by the user; if the user does not set the operation mode, the current operation mode Q is the operation mode of the air conditioner before the last shutdown.

In addition, before the air conditioner leaves the factory, the air conditioner manufacturer presets a plurality of pre-operation frequencies and each pre-operation frequency and different air conditioner related parameters (such as the current operation mode Q and the outdoor operation temperature T) in the air conditioner storage unit_W1Indoor temperature T before operation_N1Etc.) of the data.

The air conditioner calls the pre-operation frequency f of the compressor according to the pre-stored information₀Wherein f is₀≤F_RMAX。

Passing through t₂Running of time, current indoor unit coil temperature T detected_P2And indoor temperature T_N2More accurate and stable, utilizes the relative difference of same indoor coil pipe sensor to judge, avoids the erroneous judgement because of different sensor resistance drift causes, through | T_P2–T_P1|＜d₁And | T_P2–T_N2|＜d₂Is determined, triggering the pre-running frequency f₀The judgment condition for refrigerant leakage detection in the running state changes the trigger condition for refrigerant leakage detection, thereby further avoiding misjudgment caused by the same detection factor and further improving the accuracy of the detection method.

As an example of the invention, t₂The time is set to be between 2 and 10min, and the corresponding d is set under different operation modes of the air conditioner₁、d₂The numerical values of the temperature difference are different, and the temperature is more than or equal to 7 ℃ in a refrigeration or dehumidification mode₁≥3℃；7℃≥d₂Not less than 3 ℃; in the heating mode, d is more than or equal to 14 DEG C₁≥10℃；14℃≥d₂≥10℃。

Example 6:

as shown in fig. 7, in ST32, the following detection steps may be further included:

ST32a, search Q, T_W1、T_N1Corresponding compressor pre-operating frequency f₀Controlling the compressor according to f₀Carrying out air conditioner pre-operation;

ST32b, run t₂Time, detecting to obtain current indoor machine coil temperature T_P2And indoor temperature T_N2；

ST32c, determine whether | T_P2–T_P1|＜d₁And | T_P2–T_N2|＜d₂If yes, entering STR, otherwise, entering ST32 e;

ST32e, obtaining the compressor operation parameter, calculating the compressor operation power P_WAnd look-up the table to obtain the preset compressor power P at the same rotating speed_{Preparation of}；

ST32f, determine whether P is present_W/P_{Preparation of}If lambda is less than lambda, entering STR, if not, entering ST32 d;

ST32d, the refrigerant does not leak, enter ST 33;

STR, the counter reading is incremented by 1, and STR1 is run.

In this embodiment, the determination of the compressor power is performed once more after the step ST32c, compared to embodiment 5, and when the temperature T of the coil of the indoor unit is detected_P2And indoor temperature T_N2And after judging the relationship with the pre-stored relationship, if the relationship is qualified, further obtaining the operation parameters of the compressor, wherein the operation parameters comprise the rotating speed of the compressor, the voltage of the compressor and the current of the compressor, and calculating the operation power P of the compressor by a compressor power calculation module in the controller_WAnd look-up the table to obtain the preset compressor power P at the same rotating speed_{Preparation of}When P is_WAnd P_{Preparation of}When the ratio is smaller than the preset ratio threshold, the refrigerant leakage triggering condition is started to be detected, and the most visual influence of the refrigerant leakage is on the compressor, so that when the compressor can run and runs stably, the running power of the compressor is judged to start the refrigerant leakage triggering condition detection, and the precision of the detection method and the running reliability of the air conditioner are improved. As an example of the invention, the value range of the lambda is 0.6-0.9.

Example 7:

as shown in fig. 8, ST33 includes the following detection steps:

ST33a, controlling the compressor to frequency f₁Operation f₁＝nf₀And f is₁Not more than the maximum operating frequency f of the compressor_max(ii) a n is a predetermined value, and n >1；

ST33b, air Conditioning operation t₃Time, obtaining compressor suction pipe pressure P₁；

ST33c, air Conditioning operation t₄Time, obtaining compressor suction pipe pressure P₂；

ST33d, calculate whether | P₁–P₂If | < Δ P, enter ST33e, if not, enter STR;

ST33e, the refrigerant does not leak, enter ST 34;

STR, the counter reading is incremented by 1, and STR1 is run.

Other tests As with other embodiments, as an example of the present invention, the test of ST1 is used to determine whether the compressor can be operated, the compressor can be started only when the refrigerant is not seriously leaked, the compressor can be operated at high frequency only after the tests of ST2, ST31 and ST32, and the operation is performed at t₃、t₄After the air conditioner runs for a certain time, the difference value delta P of the pressure of the air suction pipe of the corresponding compressor tends to be stable, specifically, the pressure change amount in unit time is provided, the delta P is preset air conditioner data before the air conditioner leaves a factory, and if refrigerant leaks, the pressure of the air suction pipe of the compressor is rapidly reduced along with the delta P; therefore, when the detected difference value Δ P is greater than the preset value Δ P, it indicates that the air conditioner has refrigerant leakage. As an example of the invention, t₃、t₄The value range of (A) is 5-15 min.

Example 8:

as shown in fig. 9, ST34 includes the following detection steps:

ST34a, controlling the compressor to frequency f₂Operation f₂＝mf₀And the lowest operating frequency f of the compressor_min≤f₂(ii) a m is a preset value, and 1 > m > 0;

ST34b, air Conditioning operation t₅Time, obtaining the temperature T of the coil pipe of the indoor unit_P3And indoor temperature T_N3；

ST34c, determine whether | T_P3–T_P1|＜d₁And | T_P3–T_N3|＜d₂If yes, entering STR, otherwise, entering ST34 d;

ST34d, the refrigerant is not leaked, and the air conditioner normally operates;

STR, the counter reading is incremented by 1, and STR1 is run.

Other tests As with other embodiments, as an example of the present invention, the low frequency operation of the compressor is used as the fourth layer trigger condition judgment, and the indoor unit coil temperature T is again tested_P3And indoor temperature T_N3On one hand, in the judging method, the same detection element is adopted as the judgment of the trigger condition under different running states of the compressor to serve as a deviation rectifying measure, so that the accuracy and the reliability of the detecting method are ensured, and on the other hand, under the action of low frequency, the deviation generated by the influence of high humidity factors on the temperature value of the coil pipe is minimum, so that the measurement can more truly reflect the refrigerant leakage condition of the air conditioner, and the method has the advantage of small refrigerant leakage misjudgment. As an example of the invention, t₅The value range of (2-10 min), after the four layers of triggering conditions are all qualified, the refrigerant can be judged not to be leaked, and the air conditioner can normally operate.

Example 9:

as shown in fig. 10, ST4 includes the following detection steps:

ST41, STR, obtain the counter value;

ST42, judging whether the reading number of the counter is larger than k, if so, entering ST45, and if not, entering ST 43;

ST43, measuring the concentration C of the additive at that time_i2；

ST44, determine whether or not C is present_i2–C_i1＞ΔC_{Preparation of}If yes, go to ST45, if no, go to ST 46;

ST45, refrigerant leakage;

ST46, return to ST 32.

Other embodiments are the same as the other embodiments, and this embodiment discloses a method for triggering detection of refrigerant leakage conditions, wherein the refrigerant leakage conditions are multi-level and multi-factor based on a determination method of a counter, when STR occurs, a counter value is obtained, at least ST31 is determined to determine whether the counter is greater than k, k is a preset positive integer,k is more than 1, preferably k is more than or equal to 3, if the reading of the counter is more than k, the air conditioner starts to detect the refrigerant leakage condition for multiple times, namely the detection is judged to be abnormal under different detection factors, at the moment, the probability of refrigerant leakage of the air conditioner is extremely high, even if the reading of the counter is not more than k, the increment difference of the concentration of the additive passing through the outside of the refrigerant pipeline is used as a judgment basis, C is more than k, and_i1and C_i2Is Δ C, whether Δ C is greater than Δ C is determined_{Preparation of}，ΔC_{Preparation of}In order to preset a maximum difference threshold value C which can be detected when the external additive of the refrigerant loop is not leaked in the refrigerant in the storage unit_i1And C_i2For the concentration of same kind of additive, judge that the refrigerant reveals, perhaps trigger the detection that detects the refrigerant condition of revealing again, greatly improved and revealed authenticity and reliability of judging to the refrigerant.

Example 10:

as shown in fig. 11, ST5 includes the following control steps:

ST51, in ST45, refrigerant leakage is determined;

ST52, determine whether Δ C is present_{Preparation of}≤ΔC≤C₁If yes, go to ST53, if no, go to ST 54;

ST53, the air conditioner controls the air conditioning system to continue to operate under the action of the sectional control module, and primary leakage fault prompt information is sent out;

ST54, the compressor stops running, and the second-level leakage fault prompt message is sent.

In the embodiment, when the refrigerant leaks, the leakage grade of the refrigerant leakage state can be classified according to the calculated difference value delta C of the additive components, different control programs are adopted for different leakage grades under the action of the sectional control module, and when the leakage grade is serious, the operation of the compressor is stopped, so that further damage is avoided.

In this specification, the leakage grade of the first-level leakage fault is less than the leakage grade of the second-level leakage fault, the leakage grade of the second-level leakage fault is less than the leakage grade of the third-level leakage fault, when the first-level leakage fault is present, the compressor can also run at low frequency under the action of the segmented control module, on the premise of guaranteeing the safety of the air conditioner, the experience of a user is improved, when the second-level leakage fault is present, the compressor needs to stop running, the second-level leakage fault prompt message is sent out, and when the third-level leakage fault is present, the compressor cannot be started.

Example 11:

as shown in fig. 12, the present invention also discloses another refrigerant leakage detection method, which includes the following detection steps:

s1: starting an air conditioner;

s2: detecting the concentration C of M additive components outside the refrigerant loop_i2 is not more than M, and M is an integer;

s3: judging whether the concentrations of the M additive components meet the corresponding C_i>C_{Preparation of}If yes, judging that the refrigerant leaks, not operating the air conditioner, and sending three-level fault prompt information, otherwise, entering S4;

s4: compressor running time t₁；

S5: acquiring detection information including actual operation frequency F of compressor at the moment_rMeasuring and obtaining actual specific suction volume U of compressor_{Real suction}And actual specific volume of exhaust gas U_{Solid row}Obtaining the operation mode Q of the air conditioner and the current outdoor temperature T_W1Current indoor temperature T_N1Indoor unit coil temperature T_P1And the concentration C of at least one additive_i1；

S6: looking up a table to obtain the operation mode Q and the current outdoor temperature T_W1Standard suction specific volume U of compressor_{Label suction}And standard specific exhaust gas volume U_{Standard row}；

S7: determine | U_{Label suction}–U_{Real suction}I and I U_{Standard row}–U_{Solid row}If the ratio of l is smaller than m, judging that the refrigerant detection program exits and prompting the fault information of the compressor, and if not, entering S8;

s8: setting counter to 0, looking up table to obtain current T_W1Compressor preset reliable frequency at temperatureValue F_R；

S9: judging whether F is present_R-A＜F_r＜F_RMAXIf yes, the process proceeds to S10, otherwise, the process proceeds to S23;

s10: lookup Q, T_W1、T_N1Corresponding compressor pre-operating frequency f₀Controlling the compressor according to f₀Carrying out air conditioner pre-operation;

s11: operation t₂Time, detecting to obtain current indoor machine coil temperature T_P2And indoor temperature T_N2；

S12: judging whether | T_P2–T_P1|＜d₁And | T_P2–T_N2|＜d₂If yes, the process proceeds to S23, otherwise, the process proceeds to S13;

s13: obtaining the operating parameters of the compressor, and calculating the operating power P of the compressor_WAnd look-up the table to obtain the preset compressor power P at the same rotating speed_{Preparation of}；

S14: judging whether P is present_W/P_{Preparation of}If lambda is less than lambda, the process goes to S23, if not, the process goes to S15;

s15: controlling the compressor at a frequency f₁Operation f₁＝nf₀And f is₁Not more than the maximum operating frequency f of the compressor_max(ii) a n is a preset value and is more than 1;

s16: air-conditioning operation t₃Time, obtaining compressor suction pipe pressure P₁；

S17: air-conditioning operation t₄Time, obtaining compressor suction pipe pressure P₂；

S18: calculate whether | P₁–P₂If | < Δ P, enter S19, if not, enter S23;

s19: controlling the compressor at a frequency f₂Operation f₂＝mf₀And the lowest operating frequency f of the compressor_min≤f₂(ii) a m is a preset value, and 1 > m > 0;

s20: air-conditioning operation t₅Time, obtaining the temperature T of the coil pipe of the indoor unit_P3And indoor temperature T_N3；

S21: judgment ofWhether or not | T_P3–T_P1|＜d₁And | T_P3–T_N3|＜d₂If yes, the process proceeds to S23, otherwise, the process proceeds to S22;

s22: the refrigerant is not leaked, and the air conditioner normally operates;

s23: adding 1 to the reading of the counter;

s24: acquiring a counter value;

s25: judging whether the reading of the counter is greater than k, if so, entering S28, and if not, entering S26;

s26: the concentration C of the additive at this time was measured_i2；

S27: judging whether C is present_i2–C_i1＞ΔC_{Preparation of}If yes, the process proceeds to S28, otherwise, the process proceeds to S10;

s28: refrigerant leakage;

the invention also discloses an air conditioner which adopts the detection method for any refrigerant leakage.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

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 (9)

1. A refrigerant leakage detection method is characterized by comprising a refrigerant loop, detectable additives are added into the refrigerant loop, the additives are relatively inert gas mixtures, a detection device is arranged outside the refrigerant loop and used for detecting the concentration of the additives outside the refrigerant loop and feeding back the concentration to a controller, and the controller runs a corresponding control program according to a detection result and a pre-stored relation, wherein the detection method comprises the following steps:

ST 1: starting the air conditioner, performing initial detection on refrigerant leakage, and judging whether the compressor can be started normally;

ST 2: judging whether the compressor can normally operate or not;

ST 3: judging whether a preset triggering condition for detecting refrigerant leakage is met;

ST 4: judging whether the refrigerant leaks or not according to the triggering condition of the refrigerant leakage;

ST 5: executing a refrigerant leakage protection operation;

in ST3, the judgment of whether the preset triggering condition for detecting refrigerant leakage is satisfied includes the following four-layer triggering condition judgment:

ST31, compressor running time t₁Triggering the compressor operating power F_rReliable frequency value F preset with compressor_RComparing the judgment conditions to obtain a preliminary judgment result, judging the judgment result to be normal, entering ST32, and otherwise entering STR;

ST32, compressor Pre-run frequency f₀Pre-run t₂Time, detect the current indoor unit coil temperature T_P2And indoor temperature T_N2According to the pre-stored relation, obtaining a secondary judgment result, if the judgment is normal, entering ST33, otherwise entering STR;

ST33, compressor at high frequency f₁Operation t₃Detecting the pressure of the compressor suction pipe, obtaining a third judgment result according to a pre-stored relation, if the judgment result is normal, entering ST34, otherwise entering STR;

ST34, compressor at low frequency f₂Operation t₅Time, again detecting the current indoor unit coil temperature T_P3And indoor temperature T_N3Obtaining four judgment results according to a pre-stored relation, if the judgment result is normal, entering ST35, otherwise entering STR;

ST35, the refrigerant is not leaked, and the air conditioner normally operates;

and if entering the STR, adding 1 to the counter, operating the STR1, executing ST4, executing a pre-stored relation based on the reading of the counter, and judging whether the refrigerant leaks.

2. The refrigerant leakage detection method according to claim 1, wherein in ST1, the method includes the following steps:

ST11, starting the air conditioner;

ST12, detecting the concentrations of M additive components outside a refrigerant loop, wherein M is more than or equal to 2 and is an integer;

ST13, judging whether the concentrations of the M additive components all satisfy the corresponding C_i＞C_{Preparation of}Otherwise, go to ST14, if not, go to ST 15;

ST14, compressor start, ST 2;

ST15, refrigerant leaks, the air conditioner does not work, and the tertiary leakage fault prompt message is sent out.

3. The method for detecting refrigerant leakage according to claim 1 or 2, wherein ST2 includes the following steps:

ST21, compressor running time t₁；

ST22, obtaining the detection information including the actual operation frequency F of the compressor at the time_rMeasuring and obtaining actual specific suction volume U of compressor_{Real suction}Actual specific volume of exhaust gas U_{Solid row}Obtaining the operation mode Q of the air conditioner and the current outdoor temperature T_W1Current indoor temperature T_N1Indoor unit coil temperature T_P1And the concentration C of at least one additive_i1；

ST23, obtaining the operation mode Q and the current outdoor temperature T by table lookup_W1Standard suction specific volume U of compressor_{Label suction}Standard specific volume of exhaust gas U_{Standard row}；

ST24, judgment | U_{Label suction}–U_{Real suction}I and I U_{Standard row}–U_{Solid row}If the ratio of | is less than m, m is a preset value, if yes, the process goes to ST26, if no,go to ST 25;

ST25, the compressor is normal, ST3 is entered;

ST26, exit the refrigerant detection program, and prompt the compressor fault information.

4. The refrigerant leakage detection method according to claim 3, wherein in ST31, the method includes the following steps:

ST31a, setting counter to 0, looking up table to obtain current T_W1Reliable frequency value F preset by compressor under temperature_R；

ST31b, determine whether F_R-A＜F_r＜F_RMAXIf yes, entering ST31c, if no, entering STR;

ST31c, the refrigerant does not leak, enter ST 32;

STR, the counter reading is incremented by 1, and STR1 is run.

5. The refrigerant leakage detection method according to claim 4, wherein in ST32, the method includes the following steps:

ST32a, search Q, T_W1、T_N1Corresponding compressor pre-operating frequency f₀Controlling the compressor according to f₀Carrying out air conditioner pre-operation;

ST32b, run t₂Time, obtaining the current indoor unit coil temperature T_P2And indoor temperature T_N2；

ST32c, determine whether | T_P2–T_P1|＜d₁And | T_P2–T_N2|＜d₂If yes, entering STR, otherwise, entering ST32 d;

ST32d, the refrigerant does not leak, enter ST 33;

STR, the counter reading is incremented by 1, and STR1 is run.

6. The refrigerant leakage detection method according to claim 5, comprising, in ST33, the following detection steps:

ST33a, controlling the compressor to frequency f₁Operation f₁＝nf₀And f is₁Not more than the maximum operating frequency f of the compressor_maxN is a preset value, and n is more than 1;

ST33b, air Conditioning operation t₃Time, obtaining compressor suction pipe pressure P₁；

ST33c, air Conditioning operation t₄Time, obtaining compressor suction pipe pressure P₂；

ST33d, calculate whether | P₁–P₂If | < Δ P, enter ST33e, if not, enter STR;

ST33e, the refrigerant does not leak, enter ST 34;

STR, the counter reading is incremented by 1, and STR1 is run.

7. The refrigerant leakage detection method according to claim 6, comprising, in ST34, the following detection steps:

ST34a, controlling the compressor to frequency f₂Operation f₂＝mf₀And the lowest operating frequency f of the compressor_min≤f₂M is a preset value, and 1 > m > 0;

ST34b, air Conditioning operation t₅Time, obtaining the temperature T of the coil pipe of the indoor unit_P3And indoor temperature T_N3；

ST34c, determine whether | T_P3–T_P1|＜d₁And | T_P3–T_N3|＜d₂If yes, entering STR, otherwise, entering ST34 d;

ST34d, the refrigerant is not leaked, and the air conditioner normally operates;

STR, the counter reading is incremented by 1, and STR1 is run.

8. The refrigerant leakage detection method according to claim 7, comprising, in ST4, the following detection steps:

ST41, STR, obtain the counter value;

ST42, judging whether the reading number of the counter is larger than k, wherein k is a preset positive integer and is larger than 1, if so, entering ST45, and if not, entering ST 43;

ST43, measuring the concentration C of the additive at that time_i2；

ST44, determine whether or not C is present_i2–C_i1＞ΔC_{Preparation of}If yes, go to ST45, if no, go to ST 46;

ST45, refrigerant leakage;

ST46, return to ST 32.

9. An air conditioner characterized by adopting the method for detecting refrigerant leakage according to any one of claims 1 to 8.

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