Control method, control device and air conditioner for identifying refrigerant leakage

Abstract

The present application relates to the technical field of air conditioners, and in particular to a control method and device for identifying refrigerant leakage and an air conditioner. The control method for identifying refrigerant leakage comprises: obtaining suction flow of a compressor; if the change amount of the suction flow is less than 0, determining whether the compressor is frequency-reduced; and if the compressor is not frequency-reduced, determining that refrigerant leakage occurs. The control method, device and air conditioner for identifying refrigerant leakage can quickly and accurately identify air conditioner refrigerant leakage failure through the change of the suction flow of the compressor, so that timely countermeasures can be taken, the influence of refrigerant leakage on refrigeration performance is reduced, safe and reliable operation of the air conditioner refrigeration system is ensured, the cold demand of users can be better met, and comfort is improved.

Description

Technical Field

[0001] This invention relates to the field of air conditioner technology, and more specifically, to a control method, control device, and air conditioner for identifying refrigerant leaks. Background Technology

[0002] Currently, most air conditioners suffer from refrigerant leaks. Once a refrigerant leak occurs, the cooling performance of the air conditioner often deteriorates, making it difficult to meet the user's cooling needs and leading to a decrease in comfort. Therefore, quickly and accurately identifying air conditioner refrigerant leaks is of great importance for the safe and reliable operation of the air conditioning system. Summary of the Invention

[0003] The purpose of this invention is to provide a control method, control device and air conditioner for identifying refrigerant leaks, so as to alleviate the technical problem that existing air conditioners cannot identify refrigerant leak faults in a timely manner.

[0004] The control method for identifying refrigerant leaks provided by this invention includes:

[0005] Obtain the compressor's suction flow rate;

[0006] If the change in the intake flow rate is less than 0, then it is determined whether the compressor should reduce its frequency.

[0007] If the compressor does not reduce its frequency, it is determined that a refrigerant leak has occurred.

[0008] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0009] The control method for identifying refrigerant leaks provided by this invention can quickly and accurately identify air conditioning refrigerant leak faults by changing the compressor's suction flow rate, so as to take timely countermeasures, reduce the impact of refrigerant leaks on refrigeration performance, ensure the safe and reliable operation of the air conditioning refrigeration system, better meet users' cooling needs, and improve comfort.

[0010] As one possible implementation, the method further includes: if the compressor frequency is reduced, then determining whether the correspondence between the operating frequency of the compressor and the suction flow rate after the frequency reduction meets the standard conditions;

[0011] If so, then it is determined that no refrigerant leak has occurred;

[0012] If not, then it is determined that a refrigerant leak has occurred.

[0013] The beneficial effect is that it allows for further assessment of refrigerant leakage faults when the compressor frequency is reduced.

[0014] As one possible implementation, after determining that a refrigerant leak has occurred, the method further includes:

[0015] At the same time, obtain the total refrigerant charge, the current suction flow rate of the compressor, and the current operating frequency;

[0016] Based on the current operating frequency and the standard conditions, determine the standard inspiratory flow rate corresponding to the current operating frequency;

[0017] The refrigerant leakage is calculated based on the total charge, the current suction flow rate, the current operating frequency, and the standard suction flow rate.

[0018] The advantage is that it allows for the determination of refrigerant leakage, which facilitates subsequent maintenance.

[0019] As one possible implementation method, the formula for calculating the refrigerant leakage is: Q1 = (1-y)Q; where Q represents the total charge amount, and y represents the ratio of the current refrigerant charge amount to the total charge amount;

[0020] y = ax² + bx + c, where a, b, and c are adjustment coefficients, and x represents the ratio of the current inspiratory flow rate to the standard inspiratory flow rate.

[0021] The beneficial effect is that it allows for the determination of refrigerant leakage.

[0022] As one possible implementation method, the value of a ranges from 1 to 1.1, the value of b ranges from 0.3 to 0.4, and the value of c ranges from 0.2 to 0.3.

[0023] The beneficial effect is that by selecting the values ​​of each adjustment coefficient within the corresponding range, the calculated refrigerant leakage amount is more accurate.

[0024] As one possible implementation, a=1.0612, b=0.3196, c=0.2053.

[0025] The advantage is that it allows for more accurate calculation of refrigerant leakage.

[0026] As one possible implementation, the compressor's air inlet is equipped with a sensor for sensing the air intake flow rate.

[0027] The advantage is that the compressor's intake flow rate can be sensed using sensors.

[0028] The control device for identifying refrigerant leaks provided by the present invention includes:

[0029] The acquisition module is used to acquire the compressor's suction flow rate;

[0030] The judgment module is used to determine whether the compressor should reduce its frequency when the change in the intake flow rate is less than 0.

[0031] The determination module is used to determine that a refrigerant leak has occurred when the compressor is not reduced in frequency.

[0032] The air conditioner provided by the present invention includes a computer-readable storage medium storing a computer program and a processor, wherein the computer program is read and executed by the processor to implement the above-mentioned control method for identifying refrigerant leakage.

[0033] The present invention provides a computer-readable storage medium storing a computer program, which is read and executed by a processor to implement the above-described control method for identifying refrigerant leaks.

[0034] The control device, air conditioner, and computer-readable storage medium for identifying refrigerant leaks provided by this invention can achieve the same technical effects as the aforementioned control method for identifying refrigerant leaks. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0036] Figure 1 A first schematic flowchart of a control method for identifying refrigerant leaks provided in an embodiment of the present invention;

[0037] Figure 2 This is a scatter plot of refrigerant charge and compressor suction flow rate provided in an embodiment of the present invention.

[0038] Figure 3 This is a second schematic flowchart of a control method for identifying refrigerant leaks provided in an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of the control device for identifying refrigerant leaks provided in an embodiment of the present invention. Detailed Implementation

[0040] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0042] Figure 1 This is a schematic flowchart illustrating a control method for identifying refrigerant leaks provided in an embodiment of the present invention. The method includes:

[0043] S102, obtain the compressor's suction flow rate.

[0044] Specifically, a sensor can be installed at the compressor's air inlet to sense the compressor's suction flow rate in real time.

[0045] S104. If the change in intake flow rate is less than 0, determine whether the compressor frequency has been reduced.

[0046] A change in the compressor's suction flow rate of less than 0 indicates a decreasing trend in the compressor's suction flow rate.

[0047] S106 If the compressor does not reduce its frequency, it is determined that a refrigerant leak has occurred.

[0048] Under the condition that the compressor frequency is not reduced (i.e., the compressor frequency is increased or remains unchanged), the compressor's suction flow rate should not decrease in principle. However, if the suction flow rate decreases, it indicates a refrigerant leak. Therefore, the control method for identifying refrigerant leaks provided in this embodiment can quickly and accurately identify air conditioning refrigerant leak faults by observing changes in the compressor's suction flow rate. This allows for timely countermeasures, reducing the impact of refrigerant leaks on cooling performance, ensuring the safe and reliable operation of the air conditioning system, better meeting users' cooling needs, and improving comfort.

[0049] The above method also includes: if the compressor's suction flow rate decreases under the condition of compressor frequency reduction, there is a risk of refrigerant leakage. In this case, it can be determined whether the correspondence between the compressor's operating frequency and suction flow rate after frequency reduction meets the standard conditions to determine whether refrigerant leakage has occurred. The standard conditions can be a one-to-one correspondence between multiple operating frequencies and multiple standard suction flow rates, i.e., one operating frequency corresponds to one standard suction flow rate. If the compressor's suction flow rate after frequency reduction is consistent with the standard suction flow rate corresponding to its operating frequency, it indicates that the correspondence between the operating frequency and suction flow rate after frequency reduction meets the standard conditions, and the decrease in the compressor's suction flow rate is merely a change caused by the compressor's frequency reduction, thus confirming that no refrigerant leakage has occurred. Conversely, if the correspondence between the operating frequency and suction flow rate after frequency reduction does not meet the standard conditions, it indicates that a refrigerant leakage has occurred.

[0050] Once a refrigerant leak is confirmed, the following method can be used to determine the amount of refrigerant leaked to facilitate subsequent maintenance: At the same time, obtain the total refrigerant charge, the compressor's current suction flow rate, and the current operating frequency; based on the compressor's current operating frequency and the aforementioned standard conditions, determine the standard suction flow rate corresponding to the current operating frequency; calculate the refrigerant leak amount based on the total refrigerant charge, the compressor's current suction flow rate, the current operating frequency, and the standard suction flow rate.

[0051] The formula for calculating the refrigerant leakage amount Q is as follows: Q1 = (1-y)Q, where Q represents the total refrigerant charge and y represents the ratio of the current refrigerant charge Q2 to the total refrigerant charge Q, i.e., y = Q2 / Q; which is equivalent to obtaining the refrigerant leakage amount Q1 by subtracting the total refrigerant charge Q from the current refrigerant charge Q2.

[0052] The formula for calculating the ratio y of the current refrigerant charge Q2 to the total charge Q is as follows: y = ax² + bx + c, where a, b, and c are adjustment coefficients, and x represents the ratio of the compressor's current suction flow rate V1 to the standard suction flow rate Vn corresponding to the current operating frequency Fn, i.e., x = V1 / Vn.

[0053] In the above formula, the value of 'a' can be set from 1 to 1.1, preferably 1.0612; the value of 'b' can be set from 0.3 to 0.4, preferably 0.3196; and the value of 'c' can be set from 0.2 to 0.3, preferably 0.2053. By selecting the values ​​of each adjustment coefficient within the corresponding range, the calculated refrigerant leakage amount is more accurate.

[0054] The above formula and the values ​​of the adjustment coefficients a, b, and c can be determined according to... Figure 2 The scatter plot of refrigerant charge versus compressor suction flow rate was obtained by fitting.

[0055] A sensor can be installed at the compressor's air inlet to detect the compressor's suction flow rate.

[0056] Figure 3 This is a schematic flowchart of a control method for identifying refrigerant leaks provided in an embodiment of the present invention. The method includes:

[0057] S201, Begin;

[0058] S202, obtain the compressor's suction flow rate;

[0059] S203, if the change in intake flow rate ΔV < 0, then determine whether the compressor frequency has been reduced:

[0060] S204, if not, then refrigerant is leaking;

[0061] S205, if so, then determine whether the correspondence between the compressor's operating frequency Fn and the suction flow rate Vn after frequency reduction is correct;

[0062] S206: If yes, then there is no refrigerant leak; if no, then there is a refrigerant leak.

[0063] S207. After determining that it is a refrigerant leak, the refrigerant leakage amount Q1 is calculated according to the formulas y=1.0612x²+0.3196x+0.2053 and Q1=(1-y)Q, where x represents the ratio of the current suction flow rate of the compressor to the standard suction flow rate, and Q represents the total charge amount of refrigerant.

[0064] Figure 4 This is a schematic diagram of a control device for identifying refrigerant leaks provided in an embodiment of the present invention. The device includes:

[0065] The acquisition module 301 is used to acquire the suction flow rate of the compressor;

[0066] The judgment module 302 is used to determine whether the compressor frequency is reduced when the change in the intake flow rate is less than 0.

[0067] The determination module 303 is used to determine that a refrigerant leak has occurred when the compressor is not reduced in frequency.

[0068] The control device for identifying refrigerant leaks provided in this embodiment can quickly and accurately identify air conditioning refrigerant leak faults by changing the compressor's suction flow rate, so as to take timely countermeasures, reduce the impact of refrigerant leaks on refrigeration performance, ensure the safe and reliable operation of the air conditioning refrigeration system, better meet users' cooling needs, and improve comfort.

[0069] The aforementioned device also includes an auxiliary judgment module, which is used to determine whether the correspondence between the compressor's operating frequency and the suction flow rate after frequency reduction meets standard conditions when the compressor is determined to have reduced frequency. The determination module 303 is also used to determine that no refrigerant leakage has occurred when the correspondence between the compressor's operating frequency and the suction flow rate meets the standard conditions after frequency reduction; and to determine that refrigerant leakage has occurred when the correspondence between the compressor's operating frequency and the suction flow rate does not meet the standard conditions after frequency reduction.

[0070] The aforementioned device also includes a leakage determination module, which is used to determine the amount of refrigerant leakage after it is determined that a refrigerant leak has occurred.

[0071] The leakage determination module may include an acquisition unit, a determination unit, and a calculation unit. The acquisition unit is used to acquire the total refrigerant charge, the current suction flow rate of the compressor, and the current operating frequency at the same time. The determination unit is used to determine the standard suction flow rate corresponding to the current operating frequency based on the current operating frequency of the compressor and standard conditions. The calculation unit is used to calculate the refrigerant leakage amount based on the total charge, the current suction flow rate, the current operating frequency, and the standard suction flow rate.

[0072] This embodiment also provides an air conditioner, which includes a computer-readable storage medium storing a computer program and a processor. When the computer program is read and executed by the processor, it can implement the above-described control method for identifying refrigerant leaks.

[0073] This embodiment also provides a computer-readable storage medium storing a computer program. When read and executed by a processor, this computer program can implement the various processes of the embodiments of the above-described control method for identifying refrigerant leaks, achieving the same technical effects. To avoid repetition, it will not be described again here. The computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, etc.

[0074] Of course, those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by computer-controlled devices. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the above method embodiments. The storage medium can be a memory, a disk, an optical disk, etc.

[0075] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

[0076] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0077] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A control method of identifying a refrigerant leakage, characterized by, The method comprises: obtaining the suction flow of the compressor; if the change amount of the suction flow is less than 0, determining whether the compressor is frequency-reduced; if the compressor is not frequency-reduced, determining that the refrigerant leaks; at the same time, obtaining the total charge amount of the refrigerant and the current suction flow and the current operating frequency of the compressor; determining the standard suction flow corresponding to the current operating frequency according to the current operating frequency and the standard condition; calculating the refrigerant leakage amount according to the total charge amount, the current suction flow, the current operating frequency and the standard suction flow; the calculation formula of the refrigerant leakage amount is: Q1=(1-y)Q; wherein Q represents the total charge amount, and y represents the ratio of the current refrigerant charge amount to the total charge amount; y=ax2+bx+c, wherein a, b and c are adjustment coefficients, and x represents the ratio of the current suction flow to the standard suction flow. The method further comprises: if the compressor is frequency-reduced, determining whether the corresponding relationship between the operating frequency and the suction flow of the compressor after frequency reduction meets the standard condition; 2. The control method of identifying a refrigerant leakage according to claim 1, characterized by, if yes, determining that the refrigerant does not leak; if no, determining that the refrigerant leaks. The value range of a is 1-1.1, the value range of b is 0.3-0.4, and the value range of c is 0.2-0.

3.

3. The control method of identifying a refrigerant leakage according to claim 1, characterized by, a=1.0612, b=0.3196, and c=0.2053.

4. The control method of identifying a refrigerant leakage according to claim 3, characterized by, The air inlet of the compressor is provided with a sensor for sensing the suction flow.

5. The control method of identifying a refrigerant leak according to any one of claims 1-4, characterized in that, The method comprises:

6. A control device that identifies a refrigerant leakage, characterized by, an obtaining module for obtaining the suction flow of the compressor; a determining module for determining whether the compressor is frequency-reduced when the change amount of the suction flow is less than 0; a determining module for determining that the refrigerant leaks when it is determined that the compressor is not frequency-reduced; a leakage amount determining module comprising an obtaining unit, a determining unit and a calculating unit, the obtaining unit is used for obtaining the total charge amount of the refrigerant and the current suction flow and the current operating frequency of the compressor at the same time; the determining unit is used for determining the standard suction flow corresponding to the current operating frequency according to the current operating frequency and the standard condition; the calculating unit is used for calculating the refrigerant leakage amount according to the total charge amount, the current suction flow, the current operating frequency and the standard suction flow; the calculation formula of the refrigerant leakage amount is: Q1=(1-y)Q; wherein Q represents the total charge amount, and y represents the ratio of the current refrigerant charge amount to the total charge amount; y=ax2+bx+c, wherein a, b and c are adjustment coefficients, and x represents the ratio of the current suction flow to the standard suction flow. The computer readable storage medium stores a computer program, and the computer program is read and run by the processor to realize the method of any one of claims 1-5.

7. An air conditioner characterized by comprising: The computer readable storage medium stores a computer program, and the computer program is read and run by the processor to realize the method of any one of claims 1-5.

8. A computer-readable storage medium, characterized in that, ​

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