WO2020220451A1

WO2020220451A1 - Refrigerant leakage detection method and system for air conditioner, and air conditioner

Info

Publication number: WO2020220451A1
Application number: PCT/CN2019/092899
Authority: WO
Inventors: 齐虹杰; 李廷勋
Original assignee: 广东美的制冷设备有限公司; 美的集团股份有限公司
Priority date: 2019-04-29
Filing date: 2019-06-26
Publication date: 2020-11-05
Also published as: CN110044007A

Abstract

Provided in the present application are a refrigerant leakage detection method and system for an air conditioner, and an air conditioner. The refrigerant leakage detection method for an air conditioner comprises: acquiring a refrigerant concentration at a first moment and a refrigerant concentration at a second moment at a predetermined sampling point, the second moment being later than the first moment; obtaining the concentration change rate of a refrigerant according to the refrigerant concentration at the first moment, the refrigerant concentration at the second moment, the first moment, and the second moment; and determining whether the refrigerant is leaking according to the concentration change rate of the refrigerant. The refrigerant leakage detection method for an air conditioner according to the present application can accurately determine whether a refrigerant is leaking, and has the advantage of the detection result being reliable. In addition, detection speed is fast, and the detection efficiency of refrigerant leakage is effectively improved.

Description

Air conditioner refrigerant leakage detection method, system and air conditioner

Cross references to related applications

This application requires Guangdong Midea Refrigeration Equipment Co., Ltd. and Midea Group Co., Ltd. to submit on April 29, 2019, the invention title is "air-conditioning refrigerant leak detection method, system and air-conditioning", and the Chinese patent application number is "201910356443.7 "Priority.

Technical field

This application relates to the technical field of household appliances, and in particular to a refrigerant leakage detection method and system of an air conditioner, and an air conditioner.

Background technique

Leakage of air conditioner refrigerant not only affects the cooling and heating level of the air conditioner, but also has potential safety hazards. For example, for flammable refrigerants, if there are too many leaks, they may catch fire and pose safety hazards. Therefore, it is necessary to detect whether the refrigerant occurs leakage. In the related art, it is possible to determine whether a leak has occurred by detecting the concentration of the leaked refrigerant. For example, when the detected concentration reaches a certain threshold, it is determined that the leak has occurred. It is also possible to determine whether the refrigerant has leaked by detecting whether the concentration of the refrigerant has increased.

The following technical problems exist:

The method of determining whether a leak occurs by detecting the concentration of the leaked refrigerant is usually detected by a sensor or the like, which is affected by the detection accuracy of the sensor, thereby affecting the detection accuracy.

Summary of the invention

This application aims to solve one of the technical problems in the related technology at least to a certain extent.

The inventor found that the low accuracy of the method of determining whether a leak occurs by detecting the leaked refrigerant concentration is due to the fact that by detecting the leaked refrigerant concentration, when the specific threshold is set larger, the leak is determined When the response speed of the sensor is slow and the specific threshold setting is small, when the sensor is running for a long time, its characteristics may change, resulting in a certain deviation in the measured value, which is likely to cause missed judgments, misjudgments, etc., and the judgment results are inaccurate. Similarly, by detecting whether the refrigerant concentration has risen, that is, as long as the subsequent detection concentration is greater than the previous detection concentration, that is, the difference between the subsequent detection concentration and the previous detection concentration is greater than zero, it is determined that there is a leak. At this time, When the collection fluctuates, it may also affect the accuracy of judgment.

For this reason, an objective of the present application is to provide a refrigerant leakage detection method for air conditioners. The method can accurately determine whether the refrigerant leaks, and has the advantage of reliable detection results. In addition, the detection speed is fast, which effectively improves the detection efficiency of refrigerant leakage.

The second purpose of this application is to provide a refrigerant leakage detection system for air conditioners.

The third purpose of this application is to propose an air conditioner.

The fourth purpose of this application is to provide a non-transitory computer-readable storage medium.

The fifth purpose of this application is to propose an air conditioning device.

In order to achieve the above objective, the first aspect of the present application discloses a refrigerant leakage detection method for an air conditioner, which includes the following steps: acquiring a refrigerant concentration at a first time and a refrigerant concentration at a second time at a predetermined sampling point, wherein , The second time is delayed from the first time; according to the refrigerant concentration at the first time, the refrigerant concentration at the second time, the first time and the second time, the refrigeration is obtained The rate of change in the concentration of the refrigerant; determining whether the refrigerant leaks according to the rate of change in the concentration of the refrigerant.

The refrigerant leakage detection method of the air conditioner of the present application can accurately determine whether the refrigerant leaks, and has the advantage of reliable detection results. In addition, the detection speed is fast, which effectively improves the detection efficiency of refrigerant leakage.

In some examples, the obtaining the concentration change rate of the refrigerant according to the refrigerant concentration at the first time, the refrigerant concentration at the second time, the first time and the second time includes: Obtain the concentration difference between the refrigerant concentration at the second time and the refrigerant concentration at the first time; obtain the time interval between the second time and the first time; according to the concentration difference and the time interval , The concentration change rate of the refrigerant is obtained.

In some examples, the time interval is one or more refrigerant concentration sampling periods.

In some examples, the determining whether the refrigerant leaks according to the concentration change rate of the refrigerant includes: judging whether the concentration change rate of the refrigerant is greater than a preset value, wherein the preset value is positive ; If the concentration change rate is greater than the preset value, it is determined that the refrigerant leaks.

In some examples, when the refrigerant leakage is determined according to the concentration change rate of the refrigerant, the method further includes: adjusting the air flow rate at the predetermined sampling point to reduce the refrigerant concentration at the predetermined sampling point.

In some examples, the adjusting the air flow rate at the predetermined sampling point includes at least one of adjusting the speed of the indoor fan, controlling the swing of the air guide blade, and adjusting the fresh air from the fresh air system.

In some examples, when the refrigerant leakage is determined according to the concentration change rate of the refrigerant, the method further includes: controlling the air conditioner to stop; or, controlling the air conditioner to stop and close the refrigerant circulation pipeline of the refrigerant.

In some examples, when the refrigerant leakage is determined according to the concentration change rate of the refrigerant, the method further includes: performing a refrigerant leakage reminder; and/or, reporting the refrigerant leakage reminder to the server and/or the smart terminal of the user .

A second aspect of the present application discloses a refrigerant leakage detection system for an air conditioner, including: a detection module for acquiring the refrigerant concentration at the first time and the refrigerant concentration at the second time at a predetermined sampling point, wherein The second time is delayed after the first time; a concentration change rate calculation module is used to calculate the refrigerant concentration at the first time, the refrigerant concentration at the second time, the first time and the At the second moment, the concentration change rate of the refrigerant is obtained; the leakage determination module is configured to determine whether the refrigerant leaks according to the concentration change rate of the refrigerant.

The refrigerant leakage detection system of the air conditioner of the present application can accurately determine whether the refrigerant leaks, and has the advantage of reliable detection results. In addition, the detection speed is fast, which effectively improves the detection efficiency of refrigerant leakage.

In some examples, the concentration change rate calculation module is configured to obtain the concentration difference between the refrigerant concentration at the second time and the refrigerant concentration at the first time, and obtain the difference between the second time and the first time. The time interval of time, and the concentration change rate of the refrigerant is obtained according to the concentration difference and the time interval.

In some examples, the leakage determination module is configured to determine the refrigerant leakage when determining that the rate of change of the concentration of the refrigerant is greater than a preset value, wherein the preset value is positive.

In some examples, it further includes: an adjustment unit, configured to adjust the air flow rate at the predetermined sampling point when the refrigerant leaks, so as to reduce the refrigerant concentration at the predetermined sampling point.

In some examples, the adjusting unit is used for at least one of adjusting the speed of the indoor fan, controlling the swing of the wind guide blade, and adjusting the fresh air of the fresh air system.

In some examples, it further includes a control unit for controlling the shutdown of the air conditioner when the refrigerant leaks, or controlling the shutdown of the air conditioner and closing the refrigerant circulation pipeline of the refrigerant.

In some examples, it further includes: an early warning unit, configured to perform a refrigerant leakage reminder when the refrigerant leaks, and/or report the refrigerant leakage reminder to the server and/or the user's smart terminal.

A third aspect of the present application discloses an air conditioner, including: the refrigerant leakage detection system of the air conditioner according to the above-mentioned second aspect. The air conditioner can accurately determine whether the refrigerant has leaked, and has the advantage of reliable detection results. In addition, the detection speed is fast, which effectively improves the detection efficiency of refrigerant leakage.

The fourth aspect of the present application discloses a non-transitory computer-readable storage medium on which a refrigerant leakage detection program of an air conditioner is stored. When the refrigerant leakage detection program of the air conditioner is executed by a processor, the above-mentioned first aspect is realized. The air conditioner refrigerant leakage detection method described above.

The fifth aspect of the present application discloses an air conditioning device, including a memory, a processor, and a refrigerant leakage detection program of an air conditioner stored in the memory and operable on the processor, and the processor executes the cooling of the air conditioner. The refrigerant leakage detection program implements the refrigerant leakage detection method of the air conditioner described in the first aspect. The air conditioning equipment can accurately determine whether the refrigerant leaks, and has the advantage of reliable detection results. In addition, the detection speed is fast, which effectively improves the detection efficiency of refrigerant leakage.

The additional aspects and advantages of the present application will be partially given in the following description, and some will become obvious from the following description, or be understood through the practice of the present application.

Description of the drawings

The above and/or additional aspects and advantages of the present application will become obvious and easy to understand in the description of the embodiments in conjunction with the following drawings, in which:

Fig. 1 is a flowchart of a refrigerant leakage detection method for an air conditioner according to an embodiment of the present application;

2 is a schematic diagram of the concentration of leaked refrigerant in a method for detecting refrigerant leakage of an air conditioner according to an embodiment of the present application;

Fig. 3 is a structural block diagram of a refrigerant leakage detection system for an air conditioner according to an embodiment of the present application.

Detailed ways

The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the application, but should not be understood as a limitation to the application.

In the description of this application, it should be understood that the terms "center", "vertical", "horizontal", "upper", "lower", "front", "rear", "left", "right", " The orientation or positional relationship indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer" etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and The description is simplified, rather than indicating or implying that the pointed device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

The following describes the refrigerant leakage detection method, system, and air conditioner of an air conditioner according to embodiments of the present application with reference to the accompanying drawings.

Fig. 1 is a flowchart of a refrigerant leakage detection method for an air conditioner according to an embodiment of the present application. As shown in Fig. 1, a refrigerant leakage detection method for an air conditioner according to an embodiment of the present application includes the following steps:

S101: Obtain the refrigerant concentration at the first time and the refrigerant concentration at the second time on a predetermined sampling point, where the second time is delayed from the first time.

Among them, the refrigerant concentration can be detected by corresponding sensors.

The predetermined sampling point refers to a certain number of locations outside the refrigerant circulation pipeline of the refrigerant. For example, the sensor is arranged on the refrigerant circulation pipeline of the refrigerant at a pipeline connection that is relatively prone to refrigerant leakage. When a leak occurs, the leaked refrigerant concentration can be effectively detected.

Taking the refrigerant concentration sampled by the sensor as an example, due to the requirements of the sensor design specifications and other requirements, with a certain sampling period, such as 1 second, the sensor can sample the refrigerant concentration every 1 second.

For example: the current time can be used as the first time, and the sensor performs a sampling. The second time can be the time at the first time, and the time after a specific time interval. It should be noted that the time interval is one or more The refrigerant concentration sampling period, if the sampling period is 1 second, the time interval is an integer multiple of 1 second.

As shown in Figure 2, the sampling period is 1 second as an example. At the five sampling moments t0, t1, t2, t3, and t4, the sampled refrigerant concentrations are w0, w1, w2, w3, and w4, respectively. Among them, t0, t1, t2, t3, and t4 can be sampled every time a sampling period (such as 1 second), of course, can also be sampled after multiple sampling periods (such as 3 sampling periods, ie, 3 seconds) .

In the example of the present application, assuming that the time t0 is the first time and the time t1 is the second time, the refrigerant concentration at the first time t0 is w0, and the refrigerant concentration at the second time t1 is w1.

S102: Obtain the concentration change rate of the refrigerant according to the refrigerant concentration at the first time, the refrigerant concentration at the second time, the first time and the second time.

Among them, the concentration change rate of the refrigerant refers to the slope of the change in the concentration of the refrigerant over time. Then, according to the refrigerant concentration at the first time, the refrigerant concentration at the second time, the first time and the second time, the concentration change rate of the refrigerant is obtained, which can be obtained as follows:

Obtain the concentration difference between the refrigerant concentration at the second time and the refrigerant concentration at the first time, obtain the time interval between the second time and the first time, and obtain the concentration change rate of the refrigerant according to the concentration difference and the time interval .

As shown in Figure 2, also take t0 as the first time and t1 as the second time as an example, and set the sampling period as 1 second. After a sampling period from t0 to t1, the time between the second time t1 and the first time t0 The interval is 1 second, then at the second time t1, the rate of change of the refrigerant concentration can be realized by the following formula, which is:

dw _t1 = (w1-w0)/(t1-t0),

Among them, dw _t1 refers to the rate of change of the refrigerant concentration at the second time t1, so that the rate of change of the refrigerant concentration at the second time t1 is obtained.

It should be noted that the rate of change of the refrigerant concentration at other moments can also be obtained in the same manner, and no examples are given here.

S103: Determine whether the refrigerant leaks according to the concentration change rate of the refrigerant.

For example: judge whether the rate of change of the concentration of the refrigerant is greater than the preset value, if the rate of change of the concentration is greater than the preset value, determine the refrigerant leakage, where the preset value is positive, the preset value can be determined based on experience, of course, The value can also be determined according to actual requirements or actual conditions.

For example: when the preset value is set to a small value, such as 0.03, it means that the concentration change rate of the refrigerant concentration of the refrigerant collected twice has a small change, that is, the slope of the refrigerant concentration change rate is small, and it is also determined However, if the preset value is set too small, that is, the detection is too sensitive, it may not be suitable for the use of air conditioners in some homes. Therefore, the preset value can also be determined according to actual needs or actual conditions. Avoid detection that is too sensitive. Of course, you should avoid setting too large, which may result in too insensitive detection.

In other words, if the rate of change of the refrigerant concentration is a value greater than zero, it means that the refrigerant concentration sampled at the second moment is greater than the refrigerant concentration sampled at the first moment, that is, the refrigerant concentration sampled at the later moment It is greater than the refrigerant concentration sampled at the previous moment, and at the same time, when the rate of change of the refrigerant concentration is greater than a positive value, it is determined that the refrigerant has leaked continuously over time, thereby avoiding sampling errors The effect on the judgment result is that it is determined without error that the refrigerant has leaked.

Determine whether the refrigerant is leaking according to the concentration change rate of the refrigerant, which can eliminate the influence of the refrigerant concentration sampling error on the judgment result of whether the refrigerant has leaked. This is because regardless of whether there is an error in the sampling, even if there is an error in the sampling, such as the error (-0.2, +0.2), through the determination of the concentration change rate of the refrigerant by the preset value, the influence of the error on the detection result can be effectively eliminated, thus, the refrigeration can be accurately determined according to the concentration change rate of the refrigerant Whether the agent leaks.

In addition, because the sampling period is very short (such as milliseconds), the time difference between the first time and the second time can also be controlled in a short time. Therefore, whether the refrigerant is leaking is determined according to the rate of change in the concentration of the refrigerant. The refrigerant leakage judgment can be completed in a short time (such as 0.3 seconds), which has the advantage of fast detection speed.

As shown in Figure 2, when the standards for determining whether the refrigerant has leaked using concentration 1 and concentration 2 in the related technology, it can be seen that although the response speed corresponding to point A is faster, because the value of concentration 1 is small, When there is a certain deviation in sampling, it is easy to cause misjudgment, missed judgment, etc., which affects the accuracy of refrigerant leakage judgment. Although the concentration value corresponding to point C is greater than concentration 2, that is, the concentration is larger, the sampling error can be eliminated to a certain extent However, the response speed is slow, such as the time t3 has passed, or even longer, that is, the detection time is long.

When determining whether the refrigerant is leaking according to the concentration change rate of the refrigerant in this application, it can be accurately determined whether the refrigerant has leaked at the time t1, and the response speed is relatively fast.

The refrigerant leakage detection method of the air conditioner according to the embodiment of the present application can accurately determine whether the refrigerant has leaked, and has the advantage of reliable detection results. In addition, the detection speed is fast, which effectively improves the detection efficiency of refrigerant leakage.

In an embodiment of the present application, when the refrigerant leakage is determined according to the concentration change rate of the refrigerant, the method further includes: adjusting the air flow rate at the predetermined sampling point to reduce the refrigerant concentration at the predetermined sampling point.

For example: control the operation of the indoor fan of the air conditioner to increase the air flow rate, so that the concentration of the refrigerant in the leaking part is quickly reduced, to avoid the harm caused by the excessive concentration, for example: when the refrigerant is a flammable refrigerant, the concentration can be avoided Cause combustion and improve the safety of air conditioners.

Of course, in other examples of this application, adjusting the air flow rate at the predetermined sampling point may also include: controlling the swing of the wind guide blade and/or adjusting the fresh air from the fresh air system, that is, the swing of the wind guide blade can also increase The air flow rate, of course, can also send a signal to the fresh air system, control the operation of the fresh air system, and extract fresh air, which also serves the purpose of increasing the indoor air flow rate, thereby accelerating the diffusion of leaked refrigerant into the air.

Further, when the refrigerant leakage is determined according to the concentration change rate of the refrigerant, the method further includes: controlling the air conditioner to stop, or controlling the air conditioner to stop and close the refrigerant circulation pipeline of the refrigerant. In this way, more refrigerant leakage can be avoided, safety is improved, and the cost of air conditioning maintenance is reduced.

When a refrigerant leaks, in order for the user to find out in time and take timely countermeasures, in the method of the embodiment of the present application, when the refrigerant leak is determined according to the concentration change rate of the refrigerant, it also includes: performing refrigerant leakage Prompt, and/or, report refrigerant leakage prompt to the server and/or the user's smart terminal. Therefore, the user or the after-sales service of the air conditioner can immediately know that the user's air conditioner has a refrigerant leakage failure, and can perform repairs in a timely manner, thereby improving the quality of after-sales service and improving the user experience of the air conditioner.

3 is a structural block diagram of a refrigerant leakage detection system for an air conditioner according to an embodiment of the present application. As shown in FIG. 3, a refrigerant leakage detection system 300 for an air conditioner according to an embodiment of the present application includes: a detection module 310, concentration The rate of change calculation module 320 and the leakage determination module 330.

The detection module 310 is configured to obtain the refrigerant concentration at the first time and the refrigerant concentration at the second time at a predetermined sampling point, wherein the second time is delayed from the first time. The concentration change rate calculation module 320 is configured to obtain the concentration change rate of the refrigerant according to the refrigerant concentration at the first time, the refrigerant concentration at the second time, the first time and the second time. The leakage determination module 330 is configured to determine whether the refrigerant leaks according to the concentration change rate of the refrigerant.

In an embodiment of the present application, the concentration change rate calculation module 320 is configured to obtain the concentration difference between the refrigerant concentration at the second moment and the refrigerant concentration at the first moment, and to obtain the second moment The time interval from the first moment, and the concentration change rate of the refrigerant is obtained based on the concentration difference and the time interval.

Further, the time interval is one or more refrigerant concentration sampling periods.

In an embodiment of the present application, the leakage determination module 330 is configured to determine that the refrigerant is leaking when the concentration change rate of the refrigerant is determined to be greater than a preset value, wherein the preset value is positive.

In an embodiment of the present application, it further includes: an adjusting unit (not shown in FIG. 3) for adjusting the air flow rate at the predetermined sampling point when the refrigerant leaks, so as to reduce the predetermined sampling point Concentration of refrigerant on

In an embodiment of the present application, the adjustment unit is used for at least one of adjusting the speed of the indoor fan, controlling the swing of the wind guide blade, and adjusting the fresh air of the fresh air system.

In an embodiment of the present application, it further includes: a control unit (not shown in FIG. 3), configured to control the shutdown of the air conditioner when the refrigerant leaks, or control the shutdown of the air conditioner and turn off the refrigerant The refrigerant circulation pipeline.

In an embodiment of the present application, it further includes: an early warning unit (not shown in FIG. 3), configured to perform a refrigerant leakage reminder when the refrigerant leaks, and/or report a refrigerant leakage reminder to the server And/or the user’s smart terminal.

The refrigerant leakage detection system of the air conditioner of the embodiment of the present application can accurately determine whether the refrigerant has leaked, and has the advantage of reliable detection results. In addition, the detection speed is fast, which effectively improves the detection efficiency of refrigerant leakage.

It should be noted that the specific implementation of the refrigerant leakage detection system of the air conditioner in the embodiment of the application is similar to the specific implementation of the refrigerant leakage detection method of the air conditioner in the embodiment of the application. For details, please refer to the description of the method section. Do not repeat it.

Further, an embodiment of the present application discloses an air conditioner, including the refrigerant leakage detection system of the air conditioner according to any one of the above embodiments. The air conditioner can accurately determine whether the refrigerant has leaked, and has the advantage of reliable detection results. In addition, the detection speed is fast, which effectively improves the detection efficiency of refrigerant leakage.

Further, an embodiment of the present application discloses a non-transitory computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the cooling of the air conditioner according to any one of the above embodiments is realized. Agent leak detection method.

Further, an embodiment of the present application discloses an air conditioning device on which a computer program is stored, and when the computer program is executed by a processor, the method for detecting refrigerant leakage of an air conditioner according to any one of the above embodiments is realized.

According to the air conditioning equipment of the embodiment of the present application, it can accurately determine whether the refrigerant has leaked, and has the advantage of reliable detection results. In addition, the detection speed is fast, which effectively improves the detection efficiency of refrigerant leakage.

In an embodiment of the present application, the air conditioning device is, for example, an air conditioner.

In addition, other configurations and functions of the air conditioning equipment according to the embodiments of the present application are known to those of ordinary skill in the art, and in order to reduce redundancy, details are not described herein.

The aforementioned non-transitory computer-readable storage medium may adopt any combination of one or more computer-readable media. The computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium may be, for example, but not limited to, an electric, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples of computer-readable storage media (non-exhaustive list) include: electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (Read Only Memory) ; Hereinafter referred to as: ROM), Erasable Programmable Read Only Memory; hereinafter referred to as EPROM) or flash memory, optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic memory Pieces, or any suitable combination of the above. In this document, the computer-readable storage medium can be any tangible medium that contains or stores a program, and the program can be used by or in combination with an instruction execution system, apparatus, or device.

The computer-readable signal medium may include a data signal propagated in baseband or as a part of a carrier wave, and computer-readable program code is carried therein. This propagated data signal can take many forms, including, but not limited to, electromagnetic signals, optical signals, or any suitable combination of the foregoing. The computer-readable signal medium may also be any computer-readable medium other than the computer-readable storage medium. The computer-readable medium may send, propagate, or transmit the program for use by or in combination with the instruction execution system, apparatus, or device .

The program code contained on the computer-readable medium can be transmitted by any suitable medium, including, but not limited to, wireless, wire, optical cable, RF, etc., or any suitable combination of the above.

The computer program code used to perform the operations of the present application can be written in one or more programming languages or a combination thereof. The programming languages include object-oriented programming languages-such as Java, Smalltalk, C++, and also conventional Procedural programming language-such as "C" language or similar programming language. The program code can be executed entirely on the user's computer, partly on the user's computer, executed as an independent software package, partly on the user's computer and partly executed on a remote computer, or entirely executed on the remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any kind of network-including local area network (Local Area Network; hereinafter referred to as LAN) or Wide Area Network (hereinafter referred to as WAN), or Connect to an external computer (for example, use an Internet service provider to connect via the Internet).

Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and modifications can be made to these embodiments without departing from the principle and purpose of the present application. The scope of the application is defined by the claims and their equivalents.

Claims

A method for detecting refrigerant leakage of an air conditioner is characterized in that it comprises the following steps:

Acquiring the refrigerant concentration at the first time and the refrigerant concentration at the second time on a predetermined sampling point, wherein the second time is delayed after the first time;

Obtaining the concentration change rate of the refrigerant according to the refrigerant concentration at the first time, the refrigerant concentration at the second time, the first time and the second time;

It is determined whether the refrigerant leaks according to the concentration change rate of the refrigerant.
The air conditioner refrigerant leakage detection method according to claim 1, wherein the refrigerant concentration based on the first time, the refrigerant concentration at the second time, the first time and the At the second moment, the concentration change rate of the refrigerant is obtained, including:

Acquiring a concentration difference between the refrigerant concentration at the second time and the refrigerant concentration at the first time;

Acquiring the time interval between the second moment and the first moment;

According to the concentration difference and the time interval, the concentration change rate of the refrigerant is obtained.
The air conditioner refrigerant leakage detection method according to claim 2, wherein the time interval is one or more refrigerant concentration sampling periods.
The method for detecting refrigerant leakage of an air conditioner according to claim 1, wherein the determining whether the refrigerant has leaked according to the concentration change rate of the refrigerant comprises:

Judging whether the concentration change rate of the refrigerant is greater than a preset value, wherein the preset value is positive;

If the concentration change rate is greater than the preset value, it is determined that the refrigerant leaks.
The method for detecting refrigerant leakage of an air conditioner according to any one of claims 1 to 4, wherein when the refrigerant leakage is determined according to the concentration change rate of the refrigerant, the method further comprises:

The air flow rate at the predetermined sampling point is adjusted to reduce the refrigerant concentration at the predetermined sampling point.
The method for detecting refrigerant leakage of an air conditioner according to claim 5, wherein the adjusting the air flow rate at the predetermined sampling point includes: adjusting the speed of the indoor fan, controlling the swing of the air guide blade, and adjusting the fresh air in the fresh air system At least one of them.
The method for detecting refrigerant leakage of an air conditioner according to any one of claims 1 to 5, wherein when the refrigerant leakage is determined according to the concentration change rate of the refrigerant, the method further comprises:

Control the air conditioner to stop; or,

Control the air conditioner to stop and close the refrigerant circulation pipeline of the refrigerant.
The method for detecting refrigerant leakage of an air conditioner according to any one of claims 1 to 5, wherein when the refrigerant leakage is determined according to the concentration change rate of the refrigerant, the method further comprises:

Carry out refrigerant leakage reminder; and/or,

Report the refrigerant leakage reminder to the server and/or the user's smart terminal.
A refrigerant leakage detection system for an air conditioner is characterized in that it comprises:

The detection module is configured to obtain the refrigerant concentration at the first time and the refrigerant concentration at the second time at a predetermined sampling point, wherein the second time is delayed after the first time;

A concentration change rate calculation module, configured to obtain the concentration change rate of the refrigerant according to the refrigerant concentration at the first time, the refrigerant concentration at the second time, the first time and the second time;

The leakage determination module is used to determine whether the refrigerant leaks according to the concentration change rate of the refrigerant.
The air conditioner refrigerant leakage detection system according to claim 9, wherein the concentration change rate calculation module is used to obtain the refrigerant concentration at the second time and the concentration of the refrigerant at the first time And obtain the time interval between the second time and the first time, and obtain the concentration change rate of the refrigerant according to the concentration difference and the time interval.
The refrigerant leakage detection system for an air conditioner according to claim 10, wherein the time interval is one or more refrigerant concentration sampling periods.
The refrigerant leakage detection system for an air conditioner according to claim 9, wherein the leakage determination module is configured to determine the refrigerant leakage when the concentration change rate of the refrigerant is determined to be greater than a preset value, wherein , The preset value is positive.
The refrigerant leakage detection system for an air conditioner according to any one of claims 9-12, further comprising:

The adjusting unit is used to adjust the air flow rate at the predetermined sampling point when the refrigerant leaks, so as to reduce the refrigerant concentration at the predetermined sampling point.
The refrigerant leakage detection system of an air conditioner according to claim 13, wherein the adjustment unit is used for at least one of adjusting the speed of the indoor fan, controlling the swing of the wind guide blade, and adjusting the fresh air of the fresh air system.
The refrigerant leakage detection system for an air conditioner according to any one of claims 9-12, further comprising:

The control unit is used for controlling the shutdown of the air conditioner when the refrigerant leaks, or controlling the shutdown of the air conditioner and closing the refrigerant circulation pipeline of the refrigerant.
The refrigerant leakage detection system for an air conditioner according to any one of claims 9-12, further comprising:

The early warning unit is used to perform a refrigerant leakage reminder when the refrigerant leaks, and/or report the refrigerant leakage reminder to the server and/or the user's smart terminal.
An air conditioner, characterized by comprising: the air conditioner refrigerant leakage detection system according to any one of claims 9-16.
A non-temporary computer readable storage medium, on which is stored a refrigerant leakage detection program of an air conditioner, and the refrigerant leakage detection program of the air conditioner is executed by a processor to realize the refrigeration of the air conditioner according to any one of claims 1-8 Agent leak detection method.
An air conditioning device, characterized by comprising a memory, a processor, and a refrigerant leakage detection program of an air conditioner stored in the memory and operable on the processor, and the processor executes the refrigerant leakage detection program of the air conditioner When realizing the refrigerant leakage detection method of the air conditioner according to any one of claims 1-8.