Refrigerant leakage detection method of refrigerant circulation system, controller and system thereof

Abstract

The invention discloses a refrigerant leakage detection method of a refrigerant circulation system, a controller and a system thereof.The refrigerant circulation system comprises a first detection module and a second detection module which are adjacently arranged, and the method comprises the steps that in response to starting of the refrigerant circulation system, the first detection module is started, and a first refrigerant concentration value is obtained through the first detection module; and when the first refrigerant concentration value is larger than a first preset threshold value, a second detection module is started, and the measuring range upper limit of the concentration measurement interval of the first detection module is smaller than the measuring range upper limit of the concentration measurement interval of the second detection module. According to the embodiment of the invention, the sensitivity of gas concentration detection can be improved, and the accuracy of gas concentration detection can be improved.

Description

Technical Field

[0001] The present application relates to the field of gas detection, and in particular to a refrigerant leakage detection method, a controller and a system thereof for a refrigerant circulation system. Background Art

[0002] Refrigerants play an important role in energy conservation and emission reduction, but due to the characteristics of refrigerants, some refrigerants are flammable or even explosive. If the refrigerant concentration reaches a certain value, it may burn or even explode when it encounters a fire source, which poses a certain risk to people's lives and property. Therefore, refrigerant leakage can be detected to reduce the occurrence of hazards.

[0003] The refrigerant gas leak detection system based on the thermal conductivity principle has a long life and stable performance. However, the gas detection technology based on this principle is not sensitive to low-concentration gases. In practical applications, in order to avoid fire accidents caused by the refrigerant concentration reaching the minimum combustion limit concentration in a limited space, it is necessary to set an alarm threshold for the refrigerant alarm system. However, since the actual refrigerant leakage point is often a certain distance away from the installation location of the detection system sensor, the refrigerant concentration diffused to its location is low, the detected refrigerant concentration is lower than the set alarm threshold, or a longer diffusion time is required to trigger the alarm, and since the sensor is not sensitive to low-concentration refrigerant gas, the accuracy of refrigerant concentration detection is reduced, further leading to the risk of late or even missed reports of refrigerant leaks. Summary of the invention

[0004] The embodiments of the present application provide a refrigerant leakage detection method, a controller, a refrigerant leakage detection system and a storage medium for a refrigerant circulation system, which can improve the sensitivity of gas concentration detection and improve the accuracy of gas concentration detection.

[0005] In a first aspect, an embodiment of the present application provides a refrigerant leakage detection method for a refrigerant circulation system, wherein the refrigerant circulation system includes a first detection module and a second detection module disposed adjacent to each other, and the method includes:

[0006] Acquiring a first refrigerant concentration value through the first detection module;

[0007] When the first refrigerant concentration value is greater than a first preset threshold, the second detection module is turned on, wherein the upper limit of the concentration measurement interval of the first detection module is smaller than the upper limit of the concentration measurement interval of the second detection module.

[0008] According to the refrigerant leakage detection method of the refrigerant circulation system of the first aspect embodiment of the present application, there are at least the following beneficial effects: real-time detection of the gas concentration in the refrigerant circulation system, and obtaining the first refrigerant concentration value through the first detection module. Due to the characteristic that the first detection module is sensitive to low concentrations, in the process of detecting the gas concentration through the first detection module, the refrigerant leakage can be determined as early as possible, thereby enabling sensitive detection of low-concentration gases and reducing the risk of late reporting or missed reporting of refrigerant leakage. When the first refrigerant concentration value is greater than the first preset threshold value, it means that the gas concentration of the current refrigerant circulation system is too high, and the second detection module needs to be turned on, so as to accurately judge the degree of refrigerant leakage through the characteristic that the second detection module is sensitive to high concentrations, thereby accurately measuring the concentration value of the current leaking gas and achieving sensitive detection of the gas environment.

[0009] In some embodiments of the present application, the method further comprises:

[0010] When the first refrigerant concentration value is greater than or equal to the second preset threshold value and less than the first preset threshold value, matching the first refrigerant concentration value with a plurality of first preset alarm intervals to determine a first target concentration interval in which the first refrigerant concentration value is located;

[0011] A first alarm signal is generated according to the first target concentration interval.

[0012] In some embodiments of the present application, generating a second alarm signal according to the second refrigerant concentration value includes:

[0013] Matching the second refrigerant concentration value with a plurality of second preset alarm intervals to determine a second target concentration interval in which the second refrigerant concentration value is located;

[0014] A corresponding second alarm signal is generated according to the second target concentration interval.

[0015] In some embodiments of the present application, the first detection module includes a semiconductor detection probe, and the opening of the second detection module includes:

[0016] The second detection module is turned on, and the semiconductor detection probe is turned off.

[0017] In some embodiments of the present application, the second detection module includes a thermal conductivity detection probe.

[0018] In some embodiments of the present application, the refrigerant circulation system includes n groups of detection modules, each group of the detection modules includes 1 first detection module and 1 second detection module, wherein n is greater than or equal to 3; the method further includes:

[0019] Periodically obtaining a first refrigerant concentration value of each of the first detection modules, and recording a first moment when the first refrigerant concentration value exceeds a preset leakage threshold;

[0020] When the first refrigerant concentration values ​​of at least three of the first detection modules exceed the preset leakage threshold, the leakage area is determined according to the position information of the at least three first detection modules and the first moments corresponding to the at least three first detection modules.

[0021] In some embodiments of the present application, the leakage threshold is the first preset threshold; after determining the leakage area, the method further includes:

[0022] The second detection modules in all the detection modules are turned on, or the second detection modules corresponding to the at least three first detection modules are turned on.

[0023] In some embodiments of the present application, the step of activating the second detection module in all the detection modules includes:

[0024] Turning off the first detection modules in all the detection modules or turning off the at least three first detection modules;

[0025] The second detection module in all the detection modules is turned on.

[0026] In some embodiments of the present application, the step of starting at least three second detection modules corresponding to the at least three first detection modules includes:

[0027] Turning off the first detection modules in all the detection modules or turning off the at least three first detection modules;

[0028] At least three second detection modules corresponding to the at least three first detection modules are turned on.

[0029] In a second aspect, an embodiment of the present application further provides a controller comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the refrigerant leakage detection method for the refrigerant circulation system as described in the first aspect is implemented.

[0030] In a third aspect, an embodiment of the present application also provides a refrigerant circulation system, including the controller as described in the second aspect.

[0031] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the refrigerant leakage detection method for a refrigerant circulation system as described in the first aspect.

[0032] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained through the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a flow chart of a refrigerant leakage detection method for a refrigerant circulation system provided by an embodiment of the present application;

[0034] Figure 2 It is a flow chart of supplementary steps of a refrigerant leakage detection method for a refrigerant circulation system provided by an embodiment of the present application;

[0035] Figure 3 is a flow chart of supplementary steps of a refrigerant leakage detection method for a refrigerant circulation system provided by another embodiment of the present application;

[0036] Figure 4 yes Figure 3 A flowchart of the specific method of step S500;

[0037] Figure 5 yes Figure 1 A flowchart of the specific method of step S200;

[0038] Figure 6 is a flow chart of supplementary steps of a refrigerant leakage detection method for a refrigerant circulation system provided by another embodiment of the present application;

[0039] Figure 7 is a flow chart of supplementary steps of a refrigerant leakage detection method for a refrigerant circulation system provided by another embodiment of the present application;

[0040] Figure 8 is a flow chart of supplementary steps of a refrigerant leakage detection method for a refrigerant circulation system provided by another embodiment of the present application;

[0041] Fig. 9 yes Figure 7 A flowchart of the specific method of step S800;

[0042] Fig.10 yes Figure 8 A flowchart of the specific method of step S900;

[0043] Fig.11 is a flow chart of a refrigerant leakage detection method for a refrigerant circulation system provided by a specific example of the present application;

[0044] Fig.12 It is a schematic diagram of a controller provided in one embodiment of the present application. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. In addition, the characteristics, operations or features described in the specification can be combined in any appropriate manner to form various implementation methods. At the same time, the steps or actions in the method description can also be replaced or adjusted in order in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the accompanying drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a necessary sequence, unless otherwise specified that a certain sequence must be followed.

[0046] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0047] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0048] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0049] Refrigerants play an important role in energy conservation and emission reduction, but due to the characteristics of refrigerants, some refrigerants are flammable or even explosive. If the refrigerant concentration reaches a certain value, it may burn or even explode when it encounters a fire source, which poses a certain risk to people's lives and property. Therefore, refrigerant leakage can be detected to reduce the occurrence of hazards.

[0050] The refrigerant gas leak detection system based on the thermal conductivity principle has a long life and stable performance. However, the gas detection technology based on this principle itself is not sensitive to low-concentration gases. In practical applications, in order to avoid fire accidents caused by the refrigerant concentration reaching the minimum combustion limit concentration in a limited space, it is necessary to set an alarm threshold for the refrigerant alarm system. However, since the actual refrigerant leakage point is often a certain distance away from the installation location of the detection system sensor, the refrigerant concentration diffused to its location is low, the detected refrigerant concentration is lower than the set alarm threshold, or a longer diffusion time is required to trigger the alarm, and there is a situation where the refrigerant gas leak is late reported or even missed. In addition, since the sensor is not sensitive to low-concentration refrigerant gas, the accuracy of the refrigerant concentration detection is reduced, further leading to the risk of late reporting or even missed reporting of refrigerant leaks.

[0051] Based on the above situation, the embodiment of the present application provides a refrigerant leakage detection method, controller, refrigerant leakage detection system and storage medium for a refrigerant circulation system, which performs real-time detection of the gas concentration in the refrigerant circulation system, and obtains a first refrigerant concentration value through a first detection module. Due to the characteristic that the first detection module is sensitive to low concentrations, in the process of detecting the gas concentration through the first detection module, the refrigerant leakage can be determined as early as possible, thereby enabling sensitive detection of low-concentration gases and reducing the risk of late reporting or missed reporting of refrigerant leakage. When the first refrigerant concentration value is greater than the first preset threshold value, it means that the gas concentration of the current refrigerant circulation system is too high, and the second detection module needs to be turned on, so as to accurately judge the degree of refrigerant leakage through the characteristic that the second detection module is sensitive to high concentrations, thereby accurately measuring the concentration value of the current leaking gas and realizing sensitive detection of the gas environment.

[0052] The embodiments of the present application are further described below in conjunction with the accompanying drawings.

[0053] like Figure 1 As shown, Figure 1 1 is a flow chart of a refrigerant leakage detection method for a refrigerant circulation system provided in an embodiment of the present application. The refrigerant leakage detection method for a refrigerant circulation system in an embodiment of the present application includes but is not limited to steps S100 to S200.

[0054] It should be noted that the refrigerant circulation system can be an electrical equipment that utilizes refrigerant circulation to work, such as refrigeration equipment, heating equipment, etc., and multiple detection points are arranged near the electrical equipment. The refrigerant circulation system includes a first detection module and a second detection module that are adjacent to each other, and the first detection module and the second detection module are both arranged at the detection points of the electrical equipment in the refrigerant circulation system, so as to facilitate the detection of refrigerant leakage in the refrigerant circulation system.

[0055] It is understandable that the refrigerant circulation system can be applied to but not limited to various scenarios filled with flammable refrigerants, such as household air-conditioning scenarios, commercial air-conditioning scenarios, vehicle air-conditioning scenarios, cold chain transportation equipment, etc., wherein flammable refrigerants include but are not limited to R32, R454B, R290, etc.

[0056] Step S100: obtaining a first refrigerant concentration value through a first detection module;

[0057] In some embodiments, when the electrical equipment is powered on, the first refrigerant concentration value is obtained through the first detection module to fully utilize the first detection module's sensitivity to low-concentration gas, improve the sensitivity of low-concentration gas detection, and facilitate subsequent alarms and continuous detection of concentration values.

[0058] It should be noted that the first detection module in this embodiment includes one or more of a semiconductor detection probe, a non-dispersive infrared gas sensor, an ultrasonic sensor, and a sound velocity sensor; the second detection module includes one or more of a thermal conductivity detection module, a non-dispersive infrared gas sensor, an ultrasonic sensor, and a sound velocity sensor, and this embodiment does not make any specific restrictions.

[0059] It is understandable that the first refrigerant concentration value can be obtained by the first detection module detecting gases such as Freon, ammonia, carbon dioxide, and hydrofluorocarbons.

[0060] Step S200: When the first refrigerant concentration value is greater than the first preset threshold, the second detection module is turned on.

[0061] It should be noted that the upper limit of the range of the concentration measurement interval of the first detection module is smaller than the upper limit of the range of the concentration measurement interval of the second detection module.

[0062] In some embodiments, when the first refrigerant concentration value is greater than the first preset threshold value, it means that the current leaked refrigerant concentration is too high. Simply turning on the first detection module cannot achieve accurate detection of the current gas concentration. The second detection module needs to be turned on to achieve accurate detection of the current gas concentration and improve the sensitivity of detection of the current gas environment.

[0063] It should be noted that the concentration measurement interval of the second detection module may include all of the concentration measurement interval of the first detection module, partially include the concentration measurement interval of the first detection module, or not include the concentration measurement interval of the first detection module. For example, the concentration measurement interval of the first detection module is 0-10000ppm, and the concentration measurement interval of the second detection module is greater than 10000ppm; the concentration measurement interval of the first detection module is 0-10000ppm, and the concentration measurement interval of the second detection module is 0-20000ppm; the concentration measurement interval of the first detection module is 0-10000ppm, and the concentration measurement interval of the second detection module is 5000-35000ppm, etc. This embodiment does not make specific restrictions.

[0064] And the first preset threshold is 15% LFL (Lower Flammable Limit), where the lower flammable limit refers to the lowest concentration of combustible components in a gas or steam mixture, that is, below which the mixture cannot burn. And LFL is used to determine the fire and explosion hazard of a gas or steam mixture.

[0065] It is understood that the range of LFL values ​​depends on the specific combustible components and environmental conditions. Different gases have different LFL values. Generally, LFL values ​​are expressed as volume percentages. When the gas concentration is higher than LFL, the mixture is in a flammable state and is prone to fire or explosion.

[0066] Reference Figure 2 , Figure 2 It is a flowchart of the supplementary steps of the refrigerant leakage detection method of the refrigerant circulation system provided in the embodiment of the present application. The supplementary steps may include but are not limited to steps S300 to S310.

[0067] Step S300: When the first refrigerant concentration value is greater than or equal to the second preset threshold value and less than the first preset threshold value, the first refrigerant concentration value is matched with a plurality of first preset alarm intervals to determine the first target concentration interval in which the first refrigerant concentration value is located;

[0068] Step S310: generating a first alarm signal according to the first target concentration interval.

[0069] In some embodiments, when the first refrigerant concentration value is greater than or equal to the second preset threshold value and less than the first preset threshold value, it indicates that the current first refrigerant concentration value remains at a low concentration value, and the first refrigerant concentration value is matched with multiple first preset alarm intervals to determine the first target concentration interval in which the first refrigerant concentration value is currently located, wherein the first preset alarm interval is greater than the second preset threshold value. Finally, a first alarm message is generated based on the first target concentration interval, and a low-level system response is initiated, thereby realizing sensitive detection of low-concentration gas concentrations, and sending a first alarm signal in a low-concentration gas environment to avoid the risk of late reporting or missed reporting, thereby improving the safety of the refrigerant circulation system.

[0070] It should be noted that the second preset threshold in this embodiment is 5% LFL (5000ppm). When the first refrigerant concentration value is less than the second preset threshold, it means that the current gas environment is normal, and the first detection module is continuously turned on to detect the gas concentration.

[0071] Specifically, the first preset threshold is set to 15% LFL (10000ppm), the second preset threshold is set to 5% LFL (5000ppm), the concentration measurement interval of the first detection module is 0-10000ppm, and the first preset alarm interval can be between 5000ppm and 10000ppm. For example, the first preset alarm intervals are 5000ppm to 6000ppm, 6000ppm to 7000ppm, 7000ppm to 8000ppm, 8000ppm to 9000ppm, and 9000ppm to 10000ppm. When it is determined that the first refrigerant concentration value is greater than or equal to 5000ppm and less than 10000ppm, the first refrigerant concentration value is matched with multiple first preset alarm intervals, and it is determined that the first refrigerant concentration value is in the interval of 5000ppm to 6000ppm. The first detection module is controlled to generate a first alarm signal according to the interval to initiate a low-level system response, for example, the air conditioner turns on the fan to accelerate the diffusion of the refrigerant, flashes the alarm light, etc.

[0072] Reference Figure 3 , Figure 3 It is a flowchart of the supplementary steps of the refrigerant leakage detection method of the refrigerant circulation system provided in the embodiment of the present application. The supplementary steps may include but are not limited to steps S400 to S500.

[0073] It should be noted that step S400 to step S500 occur after the second detection module is turned on.

[0074] Step S400: obtaining a second refrigerant concentration value measured by a second detection module;

[0075] Step S500: generating a second alarm signal according to the second refrigerant concentration value.

[0076] In some embodiments, after turning on the second detection module, the second refrigerant concentration value measured by the second detection module is obtained to determine the gas concentration value of the current refrigerant circulation system, and then a second alarm signal is generated based on the second refrigerant concentration value to remind the user of the current alarm level, so that the user can adopt different response strategies according to different alarm levels and implement different alarm measures for different refrigerant leakage situations.

[0077] It should be noted that the first alarm signal and the second alarm signal are alarm signals for different gas concentrations, wherein the present embodiment can achieve different degrees of alarms through voice broadcast, indicator light display, etc.

[0078] Reference Figure 4 , Figure 4 yes Figure 3 In the flowchart of the specific method of step S500, step S500 may include but is not limited to step S510 and step S520.

[0079] Step S510: matching the second refrigerant concentration value with a plurality of second preset alarm intervals to determine a second target concentration interval in which the second refrigerant concentration value is located;

[0080] Step S520: Generate a corresponding second alarm signal according to the second target concentration interval.

[0081] In some embodiments, in the process of generating a second alarm signal, first, the second refrigerant concentration value is matched with a plurality of second preset alarm intervals to determine the second target concentration interval in which the second refrigerant concentration value is located, and then a corresponding second alarm signal is generated according to the second target concentration interval, thereby achieving the determination of alarm signals of different levels, and being able to generate alarm signals of different levels according to different gas concentration values ​​to improve the sensitivity of gas concentration detection.

[0082] It should be noted that the concentration ranges of multiple first preset alarm intervals and second preset alarm intervals are different. For example, the range of the first preset alarm interval is 5000ppm to 10000ppm, and the range of the second preset alarm interval is 10000ppm to 15000ppm or 10000ppm to 17000ppm, etc. This embodiment does not make specific limitations.

[0083] Specifically, the concentration measurement interval of the first detection module is set to 0-10000ppm, the concentration measurement interval of the second detection module is greater than 10000ppm, the first preset threshold is 15%LFL (10000ppm), the second preset threshold is 5%LFL (5000ppm), the first preset alarm interval is 5000ppm to 10000ppm, and the second preset alarm interval ranges from 10000ppm to 15000ppm. First, the first refrigerant concentration value is obtained through the first detection module. When the first refrigerant concentration value is greater than 10000ppm, the second detection module is turned on to obtain the second refrigerant concentration value measured by the second detection module, and the second refrigerant concentration value is matched with the second preset alarm interval to determine the interval where the second refrigerant concentration value is located. Then, a second alarm signal is generated according to the second target concentration interval to initiate a high-level system response. For example, the air conditioner will draw all the refrigerant to the outdoor unit, the fan will be fully turned on, and the buzzer will continue to alarm.

[0084] It is worth noting that the first alarm signal can be generated by the first detection module, or generated by the controller according to the first refrigerant concentration value sent by the first detection module; the second alarm signal can be generated by the second detection module, or generated by the controller according to the second refrigerant concentration value sent by the second detection module, and this embodiment does not make specific restrictions.

[0085] Reference Figure 5 , Figure 5 yes Figure 1 In the flowchart of the specific method of step S200, step S200 may include but is not limited to step S210.

[0086] It should be noted that the first detection module includes a semiconductor detection probe.

[0087] Step S210: Turn on the second detection module and turn off the semiconductor detection probe.

[0088] In some embodiments, since the first detection module includes a semiconductor detection probe, it is necessary to turn on the second detection module and turn off the semiconductor detection probe when the first refrigerant concentration value is greater than the first preset threshold value, so as to protect the semiconductor detection probe from being poisoned and inactivated by the impact of high-concentration gas, thereby extending the life of the semiconductor detection probe and reducing product development costs.

[0089] It should be noted that since the semiconductor detection probe is exposed to a high concentration of harmful gas environment, the probe surface will be adsorbed by gas or chemically reacted. If the target gas concentration is too high or lasts too long, the reactants on the probe may be exhausted. Once the reactants are exhausted, the probe will not be able to detect the target gas normally, resulting in deactivation, which affects the sensitivity and accuracy of the probe. Therefore, when the first detection module includes a semiconductor detection probe, and the first refrigerant concentration value is greater than the first preset threshold, it means that the current gas concentration is high, and it is necessary to turn off the first detection module while turning on the second detection module to avoid inactivation of the semiconductor detection probe.

[0090] It is understandable that when the first detection module does not include a semiconductor detection probe, the first detection module may continue to be turned on or off during the process of turning on the second detection module.

[0091] Reference Figure 6 , Figure 6 It is a flowchart of the supplementary steps of the refrigerant leakage detection method of the refrigerant circulation system provided in the embodiment of the present application. The supplementary steps may include but are not limited to steps S600 to S700.

[0092] It should be noted that the refrigerant circulation system includes n groups of detection modules, each group of detection modules includes one first detection module and one second detection module, wherein n is greater than or equal to 3.

[0093] The first detection module and the second detection module in each group of detection modules are arranged adjacent to each other.

[0094] Step S600: periodically obtaining the first refrigerant concentration value of each first detection module, and recording the first moment when the first refrigerant concentration value exceeds a preset leakage threshold;

[0095] In some embodiments, the first refrigerant concentration value of each first detection module is periodically obtained to detect the gas concentration in the refrigerant circulation system. The concentration change of the refrigerant system can be sensitively detected, and the first moment when the first refrigerant concentration value exceeds the preset leakage threshold is recorded, so that the concentration change in the refrigerant system can be obtained, which is convenient for the subsequent determination of the leakage area of ​​the refrigerant system.

[0096] It can be understood that the periodic acquisition in this embodiment can be to obtain the first refrigerant concentration value at preset time intervals, for example, five minutes, one minute, three minutes, etc.; the first refrigerant concentration value can also be obtained according to a set time period, for example, three times of detection in one hour, five times of detection in one hour, etc., and this embodiment does not make specific restrictions.

[0097] It should be noted that the preset leakage threshold can be a first preset threshold or a second preset threshold, that is, this embodiment can record the moment when the first refrigerant concentration value exceeds the first preset threshold or record the moment when the first refrigerant concentration value exceeds the second preset threshold. The two are described in detail below and this embodiment will not be repeated here.

[0098] Step S700: When the first refrigerant concentration values ​​of at least three first detection modules exceed a preset leakage threshold, the leakage area is determined according to the position information of the at least three first detection modules and the first moments corresponding to the at least three first detection modules.

[0099] In some embodiments, when the first refrigerant concentration value of at least three first detection modules exceeds a preset leakage threshold, the position information of at least three first detection modules is determined, and the leakage area is determined based on the position information of at least three first detection modules and the first moments of at least three first detection modules, thereby achieving accurate determination of the leakage area and facilitating subsequent repair of the leakage area.

[0100] It should be noted that, in the process of determining the leakage area, first, the time difference of each first detection module is determined through the first moments corresponding to at least three first detection modules. For example, assuming that the time of the leakage area is t0, the first moments of the first detection modules are t1, t2 and t3 respectively, and the calculated time differences are t1-t0, t2-t0 and t3-t0 respectively. Then, the velocity vector is determined according to the position information and the time difference of any two first detection modules. Finally, the leakage area is determined according to the velocity vector, the time difference and the position information of each first detection module, so as to realize the estimation of the leakage area.

[0101] Reference Figure 7 , Figure 7 It is a flow chart of the supplementary steps of the refrigerant leakage detection method of the refrigerant circulation system provided in the embodiment of the present application. The supplementary steps may include but are not limited to step S800.

[0102] It should be noted that the leakage threshold is the first preset threshold.

[0103] Step S800: start the second detection module in all detection modules.

[0104] In some embodiments, when the leakage threshold is the first preset threshold, indicating that the gas concentration in the current refrigerant system is high, it is necessary to turn on the second detection module in all detection modules to accurately detect the current gas concentration of the refrigerant system to avoid missed or misjudgment of concentration.

[0105] In some embodiments, when the leakage threshold is the second preset threshold, indicating that the gas concentration in the current refrigerant system is low, all the first detection modules can be kept turned on or at least three first detection modules that detect the first refrigerant concentration value can be kept turned on. At this time, all the second detection modules can be turned on or off.

[0106] For example, when the leakage threshold is the second preset threshold, all first detection modules are turned on and all second detection modules are turned off; or, at least three first detection modules that detect the first refrigerant concentration value are turned on and all second detection modules are turned off, and so on.

[0107] Reference Figure 8 , Figure 8 It is a flowchart of the supplementary steps of the refrigerant leakage detection method of the refrigerant circulation system provided in the embodiment of the present application. The supplementary steps may include but are not limited to step S900.

[0108] Step S900: start the second detection modules corresponding to at least three first detection modules.

[0109] In some embodiments, when the leakage threshold is the first preset threshold, only the second detection modules corresponding to at least three first detection modules may be turned on, thereby achieving accurate detection of the current gas concentration of the refrigerant system while reducing costs.

[0110] Reference Fig. 9 , Fig. 9 yes Figure 7 In the flowchart of the specific method of step S800, step S800 may include but is not limited to steps S810 to S820.

[0111] Step S810: shut down the first detection modules in all detection modules or shut down at least three first detection modules;

[0112] Step S820: start the second detection module in all detection modules.

[0113] In some embodiments, after determining the leakage area, the first detection module in all detection modules is turned off or at least three first detection modules are turned off, and then the second detection module in all detection modules is turned on to accurately detect the current gas concentration of the refrigerant system to avoid missed or misjudgment of the concentration.

[0114] Reference Fig.10 , Fig.10 yes Figure 8 The flowchart of the specific method of step S900 is shown in FIG. 1 , and the step S900 may include but is not limited to steps S910 to S920.

[0115] Step S910: shut down the first detection modules in all detection modules or shut down at least three first detection modules;

[0116] Step S920: start at least three second detection modules corresponding to the at least three first detection modules.

[0117] In some embodiments, after determining the leakage area, the first detection module in all detection modules can be turned off, or at least three first detection modules whose first refrigerant concentration values ​​exceed a preset leakage threshold can be turned off, and then at least three second detection modules corresponding to the at least three first detection modules can be turned on, thereby achieving accurate detection of the current gas concentration of the refrigerant system while reducing costs.

[0118] In order to explain the refrigerant leakage detection method of the refrigerant circulation system more clearly and clearly, a specific example is given below for illustration.

[0119] Example 1:

[0120] The first detection module in Example 1 is a semiconductor detection probe, and the second detection module is a thermal conductivity detection probe. Therefore, the two detection modules are not turned on at the same time during operation, thereby improving the sensitivity of gas environment detection in the refrigerant circulation system and avoiding the first detection module from being poisoned and inactivated in a high-concentration gas environment. The following are the specific steps:

[0121] refer to Fig.11 , Fig.11 is a flow chart of a refrigerant leakage detection method for a refrigerant circulation system provided by a specific example of the present application;

[0122] Step S1: Detecting the refrigerant gas concentration in the refrigerant circulation system through the first detection module, keeping the second detection module in a closed state, and obtaining a first refrigerant concentration value;

[0123] Step S2: determining whether the first refrigerant concentration value is higher than a second preset threshold value;

[0124] Step S3: If yes, generate a first alarm signal and determine whether the first refrigerant concentration value is higher than a first preset threshold;

[0125] Step S4: if the first refrigerant concentration value is lower than the first preset threshold value, keep the working state of the first detection module;

[0126] Step S5: If the first refrigerant concentration value is higher than the first preset threshold value, the first detection module is turned off, the second detection module is turned on, the second refrigerant concentration value is obtained, and a second alarm signal is generated.

[0127] In some embodiments, the detection sensitivity of the refrigerant circulation system is improved by the first detection module and the second detection module, which greatly reduces the requirements for the sensor installation location and reduces the product development cost. In low-concentration conditions, the first detection module's sensitivity to low-concentration gases is fully utilized. In high-concentration conditions, the second detection module's sensitivity to high concentrations is used to accurately judge the degree of refrigerant leakage, effectively reduce the risk of late reporting and missed reporting, and improve product safety.

[0128] like Fig.12 As shown, Fig.12 It is a schematic diagram of a controller provided in one embodiment of the present application.

[0129] The controller 1000 of the embodiment of the present application includes one or more processors 1001 and a memory 1002. Fig.12 In the figure, a processor 1001 and a memory 1002 are taken as an example.

[0130] The processor 1001 and the memory 1002 may be connected via a bus or other means. Fig.12 The example of connecting through bus is taken in the following.

[0131] The memory 1002, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer executable programs. In addition, the memory 1002 may include a high-speed random access memory, and may also include a non-transitory memory, such as at least one disk storage device, a flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 1002 may optionally include a memory 1002 remotely arranged relative to the processor 1001, and these remote memories may be connected to the controller 1000 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0132] Those skilled in the art will understand that Fig.12 The device structure shown in the figure does not constitute a limitation on the controller 1000, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0133] The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed on multiple network nodes. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0134] The memory, as a non-transient computer-readable storage medium, can be used to store non-transient software programs and non-transient computer executable programs. In addition, the memory may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some embodiments, the memory may optionally include a memory remotely disposed relative to the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0135] The non-transient software program and instructions required to implement the refrigerant leakage detection method for the refrigerant circulation system of the above embodiment are stored in the memory, and when executed by the processor, the above embodiment is executed.

[0136] In some embodiments, this embodiment further provides a refrigerant circulation system, including: Fig.12 Controller in .

[0137] It is worth noting that since the refrigerant circulation system of the embodiment of the present application has the controller of the above-mentioned embodiment, and the controller of the above-mentioned embodiment can execute the refrigerant leakage detection method of the refrigerant circulation system of the above-mentioned embodiment, the specific implementation manner and technical effects of the refrigerant circulation system of the embodiment of the present application can refer to the specific implementation manner and technical effects of the refrigerant leakage detection method of the refrigerant circulation system of any of the above-mentioned embodiments.

[0138] The device embodiments or system embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0139] In addition, an embodiment of the present application further provides a computer-readable storage medium, which stores computer-executable instructions, and the computer-executable instructions are executed by a processor or a controller.

[0140] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed method above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer-readable storage medium (or a non-transitory medium) and a communication medium (or a temporary medium). As known to those skilled in the art, the term computer-readable storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer-readable storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0141] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above-mentioned implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the present application. These equivalent deformations or substitutions are all included in the scope defined by the present application.

Claims

1. A refrigerant leakage detection method for a refrigerant circulation system, characterized in that: The refrigerant circulation system comprises a first detection module and a second detection module arranged adjacent to each other, and the method comprises: Acquiring a first refrigerant concentration value through the first detection module; When the first refrigerant concentration value is greater than a first preset threshold, the second detection module is turned on, wherein the upper limit of the concentration measurement interval of the first detection module is smaller than the upper limit of the concentration measurement interval of the second detection module.

2. The refrigerant leakage detection method for a refrigerant circulation system according to claim 1, characterized in that: The method further comprises: When the first refrigerant concentration value is greater than or equal to the second preset threshold value and less than the first preset threshold value, matching the first refrigerant concentration value with a plurality of first preset alarm intervals to determine a first target concentration interval in which the first refrigerant concentration value is located; A first alarm signal is generated according to the first target concentration interval.

3. The refrigerant leakage detection method for a refrigerant circulation system according to claim 1, characterized in that: After the second detection module is turned on, the method further includes: Obtaining a second refrigerant concentration value measured by the second detection module; A second alarm signal is generated according to the second refrigerant concentration value.

4. The refrigerant leakage detection method for a refrigerant circulation system according to claim 3, characterized in that: The generating a second alarm signal according to the second refrigerant concentration value comprises: Matching the second refrigerant concentration value with a plurality of second preset alarm intervals to determine a second target concentration interval in which the second refrigerant concentration value is located; A corresponding second alarm signal is generated according to the second target concentration interval.

5. The refrigerant leakage detection method for a refrigerant circulation system according to claim 1, characterized in that: The first detection module includes a semiconductor detection probe, and the second detection module is turned on, including: The second detection module is turned on, and the semiconductor detection probe is turned off.

6. The refrigerant leakage detection method for a refrigerant circulation system according to claim 1 or 5, characterized in that: The second detection module includes a thermal conductivity detection probe.

7. The refrigerant leakage detection method for a refrigerant circulation system according to claim 1, characterized in that: The refrigerant circulation system includes n groups of detection modules, each group of the detection modules includes one first detection module and one second detection module, wherein n is greater than or equal to 3; the method further includes: Periodically acquiring a first refrigerant concentration value of each of the first detection modules, and recording a first moment when the first refrigerant concentration value exceeds a preset leakage threshold; When the first refrigerant concentration values ​​of at least three of the first detection modules exceed the preset leakage threshold, the leakage area is determined according to the position information of the at least three first detection modules and the first moments corresponding to the at least three first detection modules.

8. The refrigerant leakage detection method for a refrigerant circulation system according to claim 7, characterized in that: The leakage threshold is the first preset threshold; after determining the leakage area, the method further includes: The second detection modules in all the detection modules are turned on, or the second detection modules corresponding to the at least three first detection modules are turned on.

9. The refrigerant leakage detection method for a refrigerant circulation system according to claim 8, characterized in that: The step of starting the second detection module in all the detection modules includes: Turning off the first detection modules in all the detection modules or turning off the at least three first detection modules; The second detection module in all the detection modules is turned on.

10. The refrigerant leakage detection method for a refrigerant circulation system according to claim 8, characterized in that: The step of starting at least three second detection modules corresponding to the at least three first detection modules includes: Turning off the first detection modules in all the detection modules or turning off the at least three first detection modules; At least three second detection modules corresponding to the at least three first detection modules are turned on.

11. A controller comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the refrigerant leakage detection method for a refrigerant circulation system as described in any one of claims 1 to 10 when executing the computer program.

12. A refrigerant circulation system, characterized in that: Comprising a controller as claimed in claim 11.

13. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the refrigerant leakage detection method for a refrigerant circulation system according to any one of claims 1 to 10.

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