Refrigerant leakage detection method, device and equipment, air conditioner and storage medium

Abstract

The invention relates to a refrigerant leakage detection method, device and equipment, an air conditioner and a storage medium. The method comprises the steps that after a refrigerant sensor warning signal is received for the first time, airtight control is executed on the air pipe machine; the refrigerant leakage state corresponding to the duct type air conditioner is determined by executing false alarm detection on the refrigerant sensor; if it is determined that the refrigerant leakage state is non-leakage, air supply control is executed on the duct type air conditioner; and if it is determined that the refrigerant leakage state is leaked, the outdoor unit is controlled to execute a refrigerant recovery task. After the alarm signal is received for the first time, the air pipe is changed into a closed space, the detection accuracy of the refrigerant sensor is improved, the refrigerant is prevented from leaking to the external environment, whether the refrigerant sensor has a false alarm or not is recognized, and according to the situation whether the refrigerant sensor has the false alarm or not, the alarm is given out. Whether the refrigerant leaks or not can be determined, corresponding countermeasures can be taken, and the problem that the refrigerant needs to be recycled blindly every time the alarm message is received is solved.

Description

Technical Field

[0001] The present application relates to the field of air conditioning technology, and in particular to a refrigerant leakage detection method, device, equipment, air conditioning and storage medium. Background Art

[0002] Environmentally friendly refrigerants have received more and more attention, so more environmentally friendly flammable refrigerants have entered the refrigeration industry. Although the environmental friendliness of flammable refrigerants meets the environmental protection requirements of the global market, the flammability of refrigerants leads to safety hazards in refrigeration equipment using flammable refrigerants. In order to avoid safety hazards, how to quickly detect flammable refrigerant leaks has become a concern of the refrigeration industry.

[0003] To address this problem, technicians install refrigerant sensors in the duct units of air conditioners and use them to detect the concentration of flammable refrigerants in the air. When the refrigerant sensor detects that the concentration of flammable refrigerants is greater than the preset concentration threshold, a refrigerant leakage alarm message will be issued. After receiving the refrigerant leakage alarm message, the flammable refrigerant in the duct unit is recovered and the leakage point is manually detected and repaired.

[0004] However, when the refrigerant sensor is detecting the concentration of flammable refrigerant, it may give false alarms due to malfunction or failure. However, there is currently no refrigerant leak detection method that can deal with the problem of false alarms from refrigerant sensors, so the refrigerant can only be recycled once a refrigerant leak alarm message is received. If the refrigerant sensor frequently gives false alarms, the refrigerant will have to be recycled frequently, which will lead to poor stability of the duct unit. In order to avoid the problem of frequent refrigerant recycling, it is possible to manually detect whether a refrigerant leak has occurred before the refrigerant is recycled. However, since manual detection takes a long time, when a refrigerant leak actually occurs, a large amount of flammable refrigerant will accumulate in the duct unit due to untimely refrigerant recycling. When the leakage is large, the leaked flammable refrigerant may even flow into the external environment, causing a major safety hazard. Summary of the invention

[0005] The present application provides a refrigerant leakage detection method, device, equipment, air conditioner and storage medium to solve the problem that there is currently no refrigerant leakage detection method that can deal with the problem of false alarms of refrigerant sensors. Every time a refrigerant leakage alarm message is received, the flammable refrigerant must be recovered.

[0006] In view of the above technical problems, the technical solution of this application is solved by the following embodiments:

[0007] An embodiment of the present application provides a refrigerant leakage detection method, comprising: after receiving an alarm signal from a refrigerant sensor for the first time, performing closed control on the duct unit; determining the refrigerant leakage state corresponding to the duct unit by performing false alarm detection on the refrigerant sensor; if the refrigerant leakage state is no leakage, performing air supply control on the duct unit; if the refrigerant leakage state is leakage, controlling the outdoor unit to recover the refrigerant.

[0008] Among them, the refrigerant leakage state corresponding to the duct unit is determined by performing false alarm detection on the refrigerant sensor, including: detecting the alarm reset state of the refrigerant sensor; determining the false alarm detection result corresponding to the refrigerant sensor according to the alarm reset state of the refrigerant sensor; if the false alarm detection result is a wrong alarm, determining that the refrigerant leakage state corresponding to the duct unit is not leaked; if the false alarm detection result is a normal alarm, determining that the refrigerant leakage state corresponding to the duct unit is leaked.

[0009] Among them, determining the false alarm detection result corresponding to the refrigerant sensor according to the alarm reset state of the refrigerant sensor includes: if it is detected that the refrigerant sensor is reset normally, determining that the false alarm detection result is a wrong alarm; if it is detected that the refrigerant sensor cannot be reset, determining that the false alarm detection result is a normal alarm.

[0010] Among them, the false alarm detection result corresponding to the refrigerant sensor is determined according to the alarm reset state of the refrigerant sensor, including: if it is detected that the refrigerant sensor is abnormally reset within a preset first time period, then the alarm reset state of the refrigerant sensor is detected within a preset second time period; wherein, the second time period is the time period immediately after the first time period; if it is detected that the refrigerant sensor is normally reset within the second time period, then the false alarm detection result is determined to be a wrong alarm; otherwise, the false alarm detection result is determined to be a normal alarm.

[0011] Among them, the detecting that the refrigerant sensor is abnormally reset within a preset first time period includes: if it is detected that the number of times the alarm signal of the refrigerant sensor is received within the first time period reaches a preset number threshold, it is determined that the refrigerant sensor is abnormally reset within the first time period.

[0012] The method further includes: if it is detected that the refrigerant sensor is normally reset within the second time period, determining that the refrigerant sensor fails and sending a preset sensor fault troubleshooting message.

[0013] Wherein, the controlling the outdoor unit to recover the refrigerant further includes: sending a preset refrigerant leakage investigation message; and / or opening the exhaust device in the duct unit.

[0014] The embodiment of the present application also provides a refrigerant leakage detection device, including: a closing module, used to perform closed control on the duct unit after receiving the alarm signal of the refrigerant sensor for the first time; a detection module, used to determine the refrigerant leakage status by performing false alarm detection on the refrigerant sensor; a starting module, used to perform air supply control on the duct unit when the determination module determines that the refrigerant leakage status is not leaking; and a control module, used to control the outdoor unit to recover the refrigerant when the determination module determines that the refrigerant leakage status is leaking.

[0015] An embodiment of the present application also provides a refrigerant leakage detection device, comprising: at least one communication interface; at least one bus connected to the at least one communication interface; at least one processor connected to the at least one bus; at least one memory connected to the at least one bus, wherein the processor is configured to: execute a refrigerant leakage detection program stored in the memory to implement any of the above-mentioned refrigerant leakage detection methods.

[0016] An embodiment of the present application further provides an air-conditioning device, which includes the refrigerant leakage detection device described above.

[0017] 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 executed to implement any of the above-mentioned refrigerant leakage detection methods.

[0018] The above technical solution provided by the embodiment of the present application has the following advantages over the prior art: the method provided by the embodiment of the present application can perform closed control on the duct machine after receiving the alarm signal of the refrigerant sensor for the first time; determine the refrigerant leakage state corresponding to the duct machine by performing false alarm detection on the refrigerant sensor; if it is determined that the refrigerant leakage state is not leaking, then perform air supply control on the duct machine; if it is determined that the refrigerant leakage state is leaking, then control the outdoor unit to perform the refrigerant recovery task. After receiving the alarm signal for the first time, the embodiment of the present application makes the duct into a closed space, increases the detection accuracy of the refrigerant sensor and avoids the leakage of refrigerant to the external environment, and then identifies whether the refrigerant sensor has a false alarm. According to whether the refrigerant sensor has a false alarm, it can be determined whether the refrigerant has leaked and the corresponding countermeasures can be implemented. The embodiment of the present application can more accurately determine whether the refrigerant has leaked by detecting whether the refrigerant sensor has a false alarm behavior, avoiding the problem of blindly recovering the refrigerant every time an alarm message is received. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0022] Figure 1 This is a schematic diagram of the structure of a duct machine according to an embodiment of the present application;

[0023] Figure 2 is a flow chart of a refrigerant leakage detection method according to an embodiment of the present application;

[0024] Figure 3 A flowchart of the steps of determining the refrigerant leakage state according to an embodiment of the present application;

[0025] Figure 4 is a schematic diagram of a refrigerant leakage detection method according to an embodiment of the present application;

[0026] Figure 5 is a structural diagram of a refrigerant leakage detection device according to an embodiment of the present application;

[0027] Figure 6 4 is a structural diagram of a refrigerant leakage detection device according to an embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0029] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0030] The embodiment of the present application provides a duct unit that facilitates refrigerant leakage detection. The duct unit can be used as an indoor unit of a refrigeration system (such as an air conditioner), that is, the duct unit is connected to an outdoor unit.

[0031] like Figure 1 , which is a schematic structural diagram of a duct machine according to an embodiment of the present application.

[0032] The ducted air conditioner includes: a control device, an air duct, a condensing pipe, an exhaust pipe, an air supply device, an exhaust device, and a refrigerant sensor. The air duct, the refrigerant pipe, and the refrigerant sensor are arranged inside the ducted air conditioner body. Figure 1 Not shown in the figure.

[0033] The air supply device includes: a fan arranged at one end of the air duct and an air inlet valve and an air supply valve arranged at both ends of the air duct. The fan is used to generate airflow and enter the air duct. The air inlet valve and the air supply valve are used to disconnect or open the airflow flowing in the air duct.

[0034] The exhaust device includes: an exhaust air valve and an exhaust fan arranged in the exhaust duct. One end of the exhaust duct is connected to the pipe body of the air duct, and the other end is connected to the outdoor environment. The exhaust air valve is used to disconnect or open the passage between the air duct and the exhaust duct. The exhaust fan is used to guide the airflow in the air duct to the exhaust duct. In order to facilitate the viewing of the position of the exhaust air valve, Figure 1 In the figure, the exhaust duct and the exhaust fan are not shown.

[0035] In the embodiment of the present application, the structures of the air inlet valve, the air supply valve and the air exhaust valve are not limited. For example, the structures of the air inlet valve, the air supply valve and the air exhaust valve are shutter structures.

[0036] The control device is used to control the fan, the air inlet valve, the air supply valve, the air exhaust valve, the exhaust fan and the refrigerant sensor. Further, the control device can control the fan, the air inlet valve, the air supply valve, the air exhaust valve, the exhaust fan and the refrigerant sensor wirelessly.

[0037] The refrigerant pipe is used to carry the refrigerant and circulate the refrigerant in the duct unit. The refrigerant pipe is set in the duct, so when the refrigerant leaks, the leaked refrigerant will increase the refrigerant concentration in the duct.

[0038] The refrigerant sensor is arranged in the air duct to detect the refrigerant concentration in the air duct.

[0039] Specifically, the control device starts the refrigerant sensor, controls the air inlet valve and the air supply valve to open, and controls the fan to start. The airflow generated by the fan enters the air duct from the air inlet valve, and the airflow in the air duct is discharged from the air supply valve. At this time, the exhaust fan is turned off, and the airflow cannot enter the exhaust duct. The refrigerant sensor detects the refrigerant concentration inside the air duct, and sends an alarm signal when it detects that the refrigerant concentration is greater than a preset concentration threshold. When it detects that the refrigerant concentration is less than or equal to the concentration threshold, it resets and continues to detect the refrigerant concentration inside the air duct. Among them, detecting that the refrigerant concentration is greater than the preset concentration threshold indicates that there is a suspicion of refrigerant leakage.

[0040] Generally speaking, after receiving the alarm signal from the refrigerant sensor, the control device can control the outdoor unit connected to the duct unit to recover the refrigerant, so as to recover the refrigerant in the duct unit to the outdoor unit, and prevent the refrigerant leaking from the duct unit from flowing into the place where the duct unit is located, thereby causing safety problems. However, since the refrigerant sensor has the problem of false alarms, the embodiment of the present application provides a refrigerant leakage detection method that can identify the problem of false alarms of the refrigerant sensor. After receiving the alarm signal from the refrigerant sensor, the control device controls the fan, air inlet valve, air supply valve, exhaust valve, exhaust fan and other components.

[0041] The following describes a refrigerant leakage detection method provided in accordance with an embodiment of the present application. The execution subject of the embodiment of the present application is the above-mentioned control device. Figure 2 , which is a flow chart of a refrigerant leakage detection method according to an embodiment of the present application.

[0042] Step S210, after receiving the alarm signal from the refrigerant sensor for the first time, performing closed control on the duct unit.

[0043] The refrigerant sensor is arranged in the air duct and is used for detecting the refrigerant concentration in the gas in the air duct.

[0044] The alarm signal of the refrigerant sensor refers to the alarm signal issued by the refrigerant sensor when it detects that the refrigerant concentration in the gas is greater than the preset concentration threshold. When the refrigerant concentration of the gas in the air duct is greater than the concentration threshold, it can be determined that a refrigerant leak is suspected.

[0045] Receiving the alarm signal of the refrigerant sensor for the first time means receiving the alarm signal of the refrigerant sensor for the first time after determining that there is no refrigerant leakage in the duct unit.

[0046] For example: after the air conditioner leaves the factory, an alarm signal from a refrigerant sensor is received for the first time.

[0047] For another example, after a refrigerant leak, the leak point is manually located and repairs are completed. The system continues to wait for receiving the alarm signal from the refrigerant sensor. After receiving the alarm signal from the refrigerant sensor again, the alarm signal is determined to be the first alarm signal from the refrigerant sensor received.

[0048] The airtight control of the duct machine refers to adjusting the interior of the duct machine to a closed space by controlling the components of the duct machine. Furthermore, the air supply device of the duct machine can be turned off. Of course, other components can also be set in the duct machine, and the interior of the duct machine can be adjusted to a closed space by controlling the components.

[0049] Specifically, after the duct unit is started, the air inlet valve and air supply valve are opened, the fan is started, and the exhaust valve and exhaust fan are closed. After receiving the alarm signal from the refrigerant sensor for the first time, the air supply device of the duct unit is closed, that is, the fan, air inlet valve and air supply valve are closed. Moreover, since the exhaust fan and the exhaust fan are not turned on, a closed space can be formed inside the duct. There will be no air flow in the closed space, and the leaked refrigerant can be prevented from spreading to the external space, which not only increases safety, but also makes the detection results of the refrigerant sensor more accurate.

[0050] Step S220: determining the refrigerant leakage state corresponding to the duct unit by performing false alarm detection on the refrigerant sensor.

[0051] False alarm detection is used to determine whether the refrigerant sensor has a false alarm behavior.

[0052] The types of refrigerant leakage states include but are not limited to: no leakage and leaked. Among them, no leakage means that the refrigerant has not leaked. Leaked means that the refrigerant has leaked.

[0053] In the embodiment of the present application, it is possible to determine whether a false alarm occurs in the refrigerant sensor based on the alarm reset state of the refrigerant sensor, and further determine the refrigerant leakage state.

[0054] The alarm reset state refers to whether the refrigerant sensor can be reset after sending an alarm signal. Further, in the case where the alarm signal is a false alarm, the refrigerant sensor can be reset when it normally detects that the refrigerant concentration is less than or equal to the concentration threshold and continue to detect the refrigerant concentration inside the air duct.

[0055] Step S230, determining whether the refrigerant leakage state is no leakage; if yes, executing step S240; if no, executing step S250.

[0056] Step S240: If the refrigerant leakage state is no leakage, air supply control is performed on the duct air conditioner.

[0057] The air supply control for the duct machine refers to releasing the airtight space of the duct machine by controlling the part of the duct machine so that the duct machine can work normally. Furthermore, the air supply device can be restarted.

[0058] If it is determined that the refrigerant leakage state is no leakage, it means that the refrigerant has not leaked. At this time, the air supply device can be restarted to allow the duct unit to continue to work normally.

[0059] Step S250: If the refrigerant leakage state is leaked, the outdoor unit is controlled to recover the refrigerant.

[0060] Refrigerant recovery means that the outdoor unit recovers the refrigerant in the duct unit back to the outdoor unit.

[0061] If it is determined that the refrigerant leakage state is leaked, it means that the refrigerant has leaked. At this time, it is necessary to control the outdoor unit to perform the refrigerant recovery task to recover the refrigerant in the duct unit to avoid the safety hazard caused by the refrigerant continuing to leak into the duct. Further, the control device can send a refrigerant recovery instruction to the outdoor unit. After receiving the refrigerant recovery instruction, the outdoor unit performs the refrigerant recovery task to recover the refrigerant in the duct unit to the outdoor unit.

[0062] If it is determined that the refrigerant leakage state is leaked, in addition to controlling the outdoor unit to perform the refrigerant recovery task, it also includes: sending a preset refrigerant leakage investigation message; and / or opening the exhaust device in the duct unit.

[0063] Furthermore, the refrigerant leakage troubleshooting message is used to prompt that there is a refrigerant leakage problem in the duct unit. The refrigerant leakage troubleshooting message can be sent to a preset client. The client can be installed in the user's personal terminal, or installed in the terminal device of the operation and maintenance center. For example, the client is installed in the operation and maintenance management terminal of the building. In this way, after viewing the refrigerant leakage troubleshooting message, the user can check and repair the leakage point in the duct unit as soon as possible.

[0064] Furthermore, by opening the exhaust device in the duct unit without opening the air supply device, the gas containing flammable refrigerant in the duct can be discharged from the exhaust duct to the outdoor environment, reducing the refrigerant concentration in the duct and improving the safety of the duct unit and the place where the duct unit is located.

[0065] In an embodiment of the present application, after receiving the alarm signal from the refrigerant sensor for the first time, a closed control is performed on the duct unit; by performing false alarm detection on the refrigerant sensor, the refrigerant leakage state corresponding to the duct unit is determined; if it is determined that the refrigerant leakage state is not leaking, air supply control is performed on the duct unit; if it is determined that the refrigerant leakage state is leaking, the outdoor unit is controlled to perform the refrigerant recovery task. After receiving the alarm signal for the first time, the embodiment of the present application makes the air duct into a closed space, increases the detection accuracy of the refrigerant sensor and prevents the refrigerant from leaking to the external environment, and then identifies whether the refrigerant sensor has a false alarm. According to whether the refrigerant sensor has a false alarm, it can be determined whether the refrigerant has leaked and corresponding countermeasures can be implemented. The embodiment of the present application can more accurately determine whether the refrigerant has leaked by detecting whether the refrigerant sensor has a false alarm behavior, avoiding the problem of blindly recovering the refrigerant every time an alarm message is received.

[0066] The following describes how to determine the refrigerant leakage status.

[0067] like Figure 3 , which is a flowchart of the steps of determining the refrigerant leakage status according to an embodiment of the present application.

[0068] Step S310, detecting the alarm reset state of the refrigerant sensor.

[0069] The alarm reset status refers to whether the refrigerant sensor is reset normally after sending an alarm signal.

[0070] The types of alarm reset states include: normal reset, abnormal reset, and cannot be reset.

[0071] Normal reset means that after the refrigerant sensor sends out an alarm signal, it resets and no longer sends out an alarm signal within a preset time length.

[0072] Abnormal reset means that after the refrigerant sensor sends out an alarm signal, it will intermittently alarm and reset.

[0073] Unable to reset means that after the refrigerant sensor sends out an alarm signal, it continues to send out alarm signals again and again, and cannot be reset.

[0074] Step S320: determining a false alarm detection result corresponding to the refrigerant sensor according to the alarm reset state of the refrigerant sensor.

[0075] The types of false alarm detection results include: false alarm and normal alarm.

[0076] An error alarm (i.e., a false alarm) is an alarm issued when the refrigerant sensor detects that the refrigerant concentration in the gas is greater than the concentration threshold under abnormal conditions. For example, an alarm is issued when the refrigerant sensor fails.

[0077] A normal alarm is an alarm issued when the refrigerant sensor detects that the refrigerant concentration in the gas is greater than the concentration threshold under normal circumstances.

[0078] Step S330, determining whether the false alarm detection result is a false alarm; if yes, executing step S340; if no, executing step S350.

[0079] Step S340: If the false alarm detection result is a false alarm, it is determined that the refrigerant leakage state corresponding to the duct unit is not leaking.

[0080] Step S350: If the false alarm detection result is a normal alarm, it is determined that the refrigerant leakage state corresponding to the duct unit is leaked.

[0081] The following describes in detail the process of determining the false alarm detection result corresponding to the refrigerant sensor according to the alarm reset state of the refrigerant sensor.

[0082] During the normal operation of the duct unit, after receiving the alarm signal from the refrigerant sensor for the first time, the fan, air inlet valve and air supply valve of the duct unit are immediately shut down through linkage control. At this time, the duct unit is a closed space, which can effectively rule out false alarms from the refrigerant sensor. Moreover, if a leak of flammable refrigerant is confirmed, the sealed environment can not only effectively detect the refrigerant concentration, but also effectively cut off the flammable refrigerant from entering the application site (such as indoor environment) through the air duct, thereby improving the safety of the application site.

[0083] In one case, if it is detected that the refrigerant sensor is reset normally, the false alarm detection result is determined to be a false alarm; if it is detected that the refrigerant sensor cannot be reset, the false alarm detection result is determined to be a normal alarm.

[0084] Normal resetting of the refrigerant sensor means that after the refrigerant sensor sends out the first alarm signal, it can be reset within a preset time length and does not send out an alarm signal again. Further, after receiving the alarm signal of the refrigerant sensor, if the next alarm signal is not received within a preset time length, it can be determined that the refrigerant sensor has been reset.

[0085] If the refrigerant sensor can be reset in a confined space, it can be determined that the first alarm signal received is a false alarm signal. At this time, the outdoor unit does not need to perform the refrigerant recovery task. Open the air inlet valve and the air supply valve and start the fan to restore to the operating mode before the first alarm.

[0086] If the refrigerant sensor continues to alarm in a confined space, it can be determined that there is a refrigerant leakage problem in the duct unit, and the outdoor unit needs to implement refrigerant recovery measures. In order to reduce the refrigerant concentration in the duct unit, the embodiment of the present application can simultaneously open the exhaust valve and the exhaust fan, so that the air with flammable refrigerant can be discharged to the outdoor environment. The embodiment of the present application can also send a refrigerant leakage investigation message so that the operation and maintenance personnel can check the leakage point of the duct unit and perform repairs.

[0087] In another case, after the alarm signal of the refrigerant sensor is received for the first time, if it is detected that the refrigerant sensor is abnormally reset within a preset first time period, the alarm reset state of the refrigerant sensor within a preset second time period is detected; wherein, the second time period is the time period immediately after the first time period; if it is detected that the refrigerant sensor is normally reset within the second time period, it is determined that the false alarm detection result is a false alarm; otherwise, it is determined that the false alarm detection result is a normal alarm.

[0088] The duration of the first time period and the duration of the second time period are both empirical values ​​or values ​​obtained through experiments. The starting point of the first time period is the time when the alarm signal of the refrigerant sensor is first received. The starting point of the second time period is the end point of the first time period.

[0089] Abnormal reset of the refrigerant sensor means that if it is detected that the number of times the alarm signal of the refrigerant sensor is received in the first time period reaches a preset number threshold, it is determined that the refrigerant sensor is abnormally reset in the first time period. In other words, abnormal reset means that the number of times the refrigerant sensor is judged as a false alarm in the first time period reaches the number threshold.

[0090] In an embodiment of the present application, if the refrigerant sensor has an alarm in the first time period and is normal in the second time period, it can be said that the refrigerant sensor has failed and maintenance personnel need to repair or replace the refrigerant sensor as soon as possible. Therefore, if it is detected that the refrigerant sensor is reset normally in the second time period, it is determined that the refrigerant sensor has failed and a preset sensor troubleshooting message is issued. The sensor troubleshooting message is used to prompt that the refrigerant sensor has failed and needs to be modified. The sensor troubleshooting message can be sent to the above-mentioned client. So that the user can view the sensor troubleshooting message.

[0091] In an embodiment of the present application, in order to check whether the refrigerant sensor has a fault, after detecting that the refrigerant sensor is abnormally reset within a preset first time period, the outdoor unit can be controlled to recover the refrigerant, and at the same time, the alarm reset status of the refrigerant sensor within a preset second time period is detected; if it is detected that the refrigerant sensor is normally reset within the second time period, the false alarm detection result is determined to be a false alarm; otherwise, the false alarm detection result is determined to be a normal alarm.

[0092] For example: within 1 hour after the first receipt of the alarm signal from the refrigerant sensor (the first time period), the number of intermittent alarms of the refrigerant sensor reaches 3 times (number threshold), and the refrigerant sensor is determined to be abnormally reset. At this time, the outdoor unit is controlled to recycle the refrigerant, and the alarm reset status of the refrigerant sensor continues to be detected. For example, the detection time can last for 5 minutes (the second time period). If the refrigerant sensor is reset normally, the false alarm detection result is determined to be a false alarm and the sensor is determined to be faulty; if the refrigerant sensor continues to alarm and still has not reset, it means that there is a refrigerant leak in the duct unit, and the false alarm detection result can be determined to be a normal alarm.

[0093] Before recycling the refrigerant, the embodiment of the present application identifies whether the refrigerant sensor has a false alarm problem based on the reset status of the refrigerant sensor. If the refrigerant sensor does not have a false alarm problem, the outdoor unit executes refrigerant recycling. If the refrigerant sensor has a false alarm problem, it can also identify whether the refrigerant sensor has a fault so as to troubleshoot the fault as soon as possible. The embodiment of the present application enhances the safety and accuracy of the refrigerant sensor in detecting refrigerant leakage, and can ensure that the application site is always in a safe space, achieving a state of simultaneous safety and energy saving. Even if a leak occurs, it can timely self-diagnose whether it needs to be shut down or alarm for maintenance, and ensure the operating stability of the duct machine and the entire refrigeration system as much as possible. Through linkage control, under the premise of safe use, the downtime is reduced as much as possible, thereby achieving the effect of safety and energy saving, and improving the customer's use experience and economy.

[0094] A more specific example is provided below to illustrate the refrigerant leakage detection method of the present application embodiment. Figure 4 , which is a schematic diagram of a refrigerant leakage detection method according to an embodiment of the present application.

[0095] When the refrigeration system is operating normally, the fan in the air supply device is in the started state, the air inlet valve and the air supply valve are both in the open state, and the exhaust valve and the exhaust fan are both in the closed state.

[0096] When the control device receives the alarm signal from the refrigerant sensor for the first time, it immediately shuts down the fan, air inlet valve and air outlet valve of the duct unit through linkage control. At this time, the inside of the duct unit is a closed space. If there is a refrigerant leakage problem, the refrigerant concentration in the closed space will become larger and larger. Therefore, the closed space can effectively rule out false alarms from the refrigerant sensor. Moreover, when there is a refrigerant leakage problem, the sealed environment can effectively cut off the flammable refrigerant from entering the application site through the air duct, thereby improving the safety of the application site.

[0097] After receiving the alarm signal of the refrigerant sensor for the first time, the control device monitors the alarm reset state of the refrigerant sensor.

[0098] If the refrigerant sensor resets normally in a closed space after the alarm, it is determined that the refrigerant sensor has issued an erroneous alarm. At this time, there is no need to perform refrigerant recovery measures on the outdoor unit. Open the air inlet valve and the air outlet valve, start the fan, and restore the duct unit to the operating mode before the refrigerant sensor alarm.

[0099] If the refrigerant sensor continues to alarm in a confined space (cannot be reset), it is determined that the refrigerant sensor alarms normally. At this time, there is a refrigerant leakage problem in the duct unit. The outdoor unit needs to implement refrigerant recovery measures. At the same time, the exhaust valve and exhaust fan need to be opened to exhaust the air containing flammable refrigerant to the outdoor environment and send a refrigerant leakage investigation message to the client to alert the operation and maintenance personnel to check the leakage point of the duct unit.

[0100] If the refrigerant sensor alarms and then alarms intermittently in a confined space (abnormal reset), for example, it is judged as a false alarm for multiple times in a first time period and the number of times has reached the number threshold, then the outdoor unit is controlled to recycle the refrigerant in the duct unit first, and at the same time, the alarm reset device of the refrigerant sensor can be detected for a longer time to determine whether the refrigerant sensor continues to alarm in the second time period. If the refrigerant sensor continues to alarm in the second time period and fails to reset normally, it is determined that there is a leak in the duct unit, and a refrigerant leak troubleshooting message is sent to the client to warn the operation and maintenance personnel to check the indoor unit leak point; if the refrigerant sensor stops alarming in the second time period and resets normally, it is determined that the refrigerant sensor is faulty, and a sensor fault troubleshooting message is sent to the client to warn the operation and maintenance personnel to check the refrigerant sensor. Since the refrigerant needs to be recovered regardless of checking the leak point or checking whether the refrigerant sensor is faulty, the embodiment of the present application can control the outdoor unit to recycle the refrigerant in the duct unit first when it is detected that the refrigerant sensor is abnormally reset in the first time period, so as to shorten the waiting time for the inspection.

[0101] The embodiment of the present application can control the refrigerant sensor and the air inlet and outlet valves of the duct machine in a linkage manner. After detecting the alarm of the refrigerant sensor, the fan of the duct machine is stopped, and the air inlet and outlet valves of the duct machine are closed at the same time. A secondary detection is performed inside the duct machine to rule out whether the refrigerant sensor is a false alarm. If the refrigerant sensor still alarms during the secondary detection, it can be determined that the refrigerant sensor is a normal alarm behavior, and the outdoor unit can perform refrigerant recovery measures. At this time, the exhaust valve can also be opened and the exhaust fan of the exhaust duct can be turned on to discharge the gas containing the refrigerant from the duct machine to ensure the safety and reliability of the duct machine application site.

[0102] The present application also provides a refrigerant leakage detection device. Figure 5 , which is a structural diagram of a refrigerant leakage detection device according to an embodiment of the present application.

[0103] The refrigerant leakage detection device comprises:

[0104] The closing module 510 is used to perform sealing control on the duct unit after receiving the alarm signal from the refrigerant sensor for the first time.

[0105] The detection module 520 is used to determine the refrigerant leakage state by performing false alarm detection on the refrigerant sensor.

[0106] The starting module 530 is used to perform air supply control on the duct air conditioner when the determining module determines that the refrigerant leakage state is no leakage.

[0107] The control module 540 is used to control the outdoor unit to recover the refrigerant when the determination module determines that the refrigerant leakage state is leakage.

[0108] The functions of the device described in the embodiment of the present application have been described in the above method embodiment. Therefore, for any details not provided in the description of this embodiment, please refer to the relevant descriptions in the above embodiment and will not be repeated here.

[0109] The present application also provides a refrigerant leakage detection device, such as Figure 6 , which is a structural diagram of a refrigerant leakage detection device according to an embodiment of the present application.

[0110] The refrigerant leakage detection device includes: a processor 610, a communication interface 620, a memory 630 and a communication bus 640. The processor 610, the communication interface 620 and the memory 630 communicate with each other through the communication bus 640.

[0111] The memory 630 is used to store computer programs.

[0112] In one embodiment of the present application, the processor 610, when executing the program stored in the memory 630, implements the refrigerant leakage detection method provided by any of the aforementioned method embodiments, including: after receiving the alarm signal of the refrigerant sensor for the first time, performing closed control on the duct unit; determining the refrigerant leakage status corresponding to the duct unit by performing false alarm detection on the refrigerant sensor; if the refrigerant leakage status is no leakage, performing air supply control on the duct unit; if the refrigerant leakage status is leakage, controlling the outdoor unit to recover the refrigerant.

[0113] Among them, the refrigerant leakage state corresponding to the duct unit is determined by performing false alarm detection on the refrigerant sensor, including: detecting the alarm reset state of the refrigerant sensor; determining the false alarm detection result corresponding to the refrigerant sensor according to the alarm reset state of the refrigerant sensor; if the false alarm detection result is a wrong alarm, determining that the refrigerant leakage state corresponding to the duct unit is not leaked; if the false alarm detection result is a normal alarm, determining that the refrigerant leakage state corresponding to the duct unit is leaked.

[0114] Among them, determining the false alarm detection result corresponding to the refrigerant sensor according to the alarm reset state of the refrigerant sensor includes: if it is detected that the refrigerant sensor is reset normally, determining that the false alarm detection result is a wrong alarm; if it is detected that the refrigerant sensor cannot be reset, determining that the false alarm detection result is a normal alarm.

[0115] Among them, the false alarm detection result corresponding to the refrigerant sensor is determined according to the alarm reset state of the refrigerant sensor, including: if it is detected that the refrigerant sensor is abnormally reset within a preset first time period, then the alarm reset state of the refrigerant sensor is detected within a preset second time period; wherein, the second time period is the time period immediately after the first time period; if it is detected that the refrigerant sensor is normally reset within the second time period, then the false alarm detection result is determined to be a wrong alarm; otherwise, the false alarm detection result is determined to be a normal alarm.

[0116] Among them, the detecting that the refrigerant sensor is abnormally reset within a preset first time period includes: if it is detected that the number of times the alarm signal of the refrigerant sensor is received within the first time period reaches a preset number threshold, it is determined that the refrigerant sensor is abnormally reset within the first time period.

[0117] The method further includes: if it is detected that the refrigerant sensor is normally reset within the second time period, determining that the refrigerant sensor fails and sending a preset sensor fault troubleshooting message.

[0118] Wherein, the controlling the outdoor unit to recover the refrigerant further includes: sending a preset refrigerant leakage investigation message; and / or opening the exhaust device in the duct unit.

[0119] The embodiment of the present application also provides an air conditioning device, which includes the refrigerant leakage detection device described above. In this way, after receiving the alarm signal for the first time, the air conditioning device can make the air duct into a closed space, increase the detection accuracy of the refrigerant sensor and prevent the refrigerant from leaking to the external environment, and then identify whether the refrigerant sensor has a false alarm. According to whether the refrigerant sensor has a false alarm, it can be determined whether the refrigerant has leaked and corresponding countermeasures can be implemented. The embodiment of the present application can more accurately determine whether the refrigerant has leaked by detecting whether the refrigerant sensor has a false alarm behavior, avoiding the problem of blindly recovering the refrigerant every time an alarm message is received.

[0120] The present application also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the refrigerant leakage detection method provided in any of the above method embodiments are implemented. Since the refrigerant leakage detection method has been described in detail above, for any details not fully described in the description of this embodiment, please refer to the relevant descriptions in the above embodiments, and no further description will be given here.

[0121] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, 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.

[0122] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a general hardware platform, and of course, by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the relevant technology can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0123] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0124] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A refrigerant leakage detection method, characterized in that: include: After receiving the alarm signal from the refrigerant sensor for the first time, the duct unit is closed controlled; Determine the refrigerant leakage state corresponding to the duct unit by performing false alarm detection on the refrigerant sensor; If the refrigerant leakage state is no leakage, air supply control is performed on the duct air conditioner; If the refrigerant leakage state is leaked, the outdoor unit is controlled to recover the refrigerant.

2. The method according to claim 1, characterized in that The determining the refrigerant leakage state corresponding to the duct unit by performing false alarm detection on the refrigerant sensor includes: Detecting the alarm reset state of the refrigerant sensor; Determining a false alarm detection result corresponding to the refrigerant sensor according to the alarm reset state of the refrigerant sensor; If the false alarm detection result is a false alarm, determining that the refrigerant leakage state corresponding to the duct unit is no leakage; If the false alarm detection result is a normal alarm, it is determined that the refrigerant leakage state corresponding to the duct unit is leaked.

3. The method according to claim 1, characterized in that The determining, according to the alarm reset state of the refrigerant sensor, a false alarm detection result corresponding to the refrigerant sensor includes: If it is detected that the refrigerant sensor is reset normally, determining that the false alarm detection result is a false alarm; If it is detected that the refrigerant sensor cannot be reset, the false alarm detection result is determined to be a normal alarm.

4. The method according to claim 1, characterized in that The determining, according to the alarm reset state of the refrigerant sensor, a false alarm detection result corresponding to the refrigerant sensor includes: If it is detected that the refrigerant sensor is abnormally reset within a preset first time period, then the alarm reset state of the refrigerant sensor is detected within a preset second time period; wherein the second time period is a time period immediately after the first time period; If it is detected that the refrigerant sensor is normally reset within the second time period, the false alarm detection result is determined to be a false alarm; otherwise, the false alarm detection result is determined to be a normal alarm.

5. The method according to claim 4, characterized in that The method further comprises: If it is detected that the refrigerant sensor is normally reset within the second time period, it is determined that the refrigerant sensor fails and a preset sensor failure troubleshooting message is issued.

6. The method according to claim 1, characterized in that The controlling the outdoor unit to recover the refrigerant also includes: Sending a pre-set refrigerant leak troubleshooting message; and / or, Open the exhaust device in the duct machine.

7. The method according to claim 1, characterized in that The airtight control of the duct machine includes: closing the air supply device and the exhaust device of the duct machine; The performing air supply control on the air duct machine includes: restarting the air supply device.

8. A refrigerant leakage detection device, characterized in that: include: A closing module is used to perform closed control on the duct unit after receiving an alarm signal from the refrigerant sensor for the first time; A detection module, configured to determine a refrigerant leakage state by performing false alarm detection on the refrigerant sensor; A starting module, configured to execute air supply control on the duct air conditioner when the determining module determines that the refrigerant leakage state is no leakage; The control module is used to control the outdoor unit to recover the refrigerant when the determination module determines that the refrigerant leakage state is leakage.

9. A refrigerant leakage detection device, characterized in that: include: at least one communication interface; at least one bus connected to the at least one communication interface; at least one processor connected to the at least one bus; At least one memory connected to the at least one bus, wherein the processor is configured to: execute a refrigerant leakage detection program stored in the memory to implement the refrigerant leakage detection method according to any one of claims 1-7.

10. An air conditioning device, characterized in that: The air conditioning equipment includes the refrigerant leakage detection equipment according to claim 9.

11. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are executed to implement the refrigerant leakage detection method according to any one of claims 1 to 7.

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