Control method for refrigerant leakage detection system and refrigerant detection system

Abstract

The invention provides a control method for a refrigerant leakage detection system and the refrigerant detection system.The control method is applied to an air conditioner, the air conditioner comprises an indoor heat exchanger and a refrigerant sensor, and the refrigerant sensor comprises a sensing element used for detecting refrigerant medium leakage in the indoor heat exchanger. The control method includes the steps that indoor parameters in a room are obtained, and refrigerant parameters of a refrigerant medium are obtained; according to the indoor parameters and the refrigerant parameters, the working mode of the air conditioner is judged; controlling the sensing element to enter a first power-on regulation and control mode according to the working mode; wherein the first power-on regulation and control mode comprises the step of controlling the sensing element to intermittently operate in a power-on mode and a non-power-on mode; the refrigerant sensor solves the technical problems that when a refrigerant sensor in the prior art detects refrigerant leakage, a sensing element of the refrigerant sensor is always in a power-on state, the sensing element is gradually degraded after being used for a long time, and therefore the service life of the refrigerant sensor is affected.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerant detection, and in particular to a control method for a refrigerant leakage detection system and a refrigerant detection system. Background Art

[0002] In air conditioners, in order to prevent global warming, refrigerants with a small global warming potential (GWP) have begun to be used. However, most refrigerants with a small GWP are flammable, such as R32. In addition, in a multi-split system that uses one outdoor unit to control multiple indoor units, the risk of fire caused by refrigerant leakage increases due to the large amount of refrigerant filled. Therefore, in order to detect indoor refrigerant leakage as early as possible, a refrigerant sensor is used. The refrigerant sensor is installed as an external device inside the indoor unit of the air conditioner or indoors. In the case of an external refrigerant sensor, since the refrigerant is heavier than air, it is installed near the ground to quickly detect refrigerant leakage.

[0003] However, there is at least one of the following problems in the related art: when the refrigerant sensor in the prior art detects refrigerant leakage, the sensor element of the refrigerant sensor is always powered on. Long-term use causes the sensor element to gradually deteriorate, thereby affecting the service life of the refrigerant sensor. Summary of the invention

[0004] The technical problem solved by the present invention is that when the refrigerant sensor in the prior art detects refrigerant leakage, the sensor element of the refrigerant sensor is always in an energized state. Long-term use causes the sensor element to gradually deteriorate, thereby affecting the service life of the refrigerant sensor.

[0005] To solve the above problems, on the one hand, the present invention provides a control method for a refrigerant leakage detection system, which is applied to an air conditioner, the air conditioner includes an indoor heat exchanger and a refrigerant sensor, the refrigerant sensor includes a sensor element for detecting refrigerant leakage in the indoor heat exchanger, and the control method includes: Obtain indoor parameters of the room, and obtain refrigerant parameters of the refrigerant medium; Determine the working mode of the air conditioner based on indoor parameters and refrigerant parameters; According to the working mode, controlling the sensor element to enter a first power-on control mode; The first power-on control mode includes controlling the sensor element to operate intermittently in a power-on mode and a non-power-on mode.

[0006] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: this solution avoids the sensor element being in the powered state for a long time by controlling the sensor element to operate intermittently in the powered mode and the non-powered mode according to the working mode of the air conditioner, thereby effectively extending the service life of the sensor element.

[0007] In an example of the present invention, the working modes include a refrigeration mode, a heating mode, and a stop operation mode. Define the non - energized time ratio of the sensing element when the working mode includes the stop operation mode as A0. The first energization control mode further includes: When the working mode includes the refrigeration mode, control A1 > A0; When the working mode includes the heating mode, control A2 < A0; Wherein, A1 is the non - energized time ratio when the air conditioner is in the refrigeration mode, and A2 is the non - energized time ratio when the air conditioner is in the heating mode.

[0008] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: By adjusting the non - energized time ratio of the sensing element when the air conditioner is in different working modes, this solution can not only ensure the detection function of refrigerant leakage, but also reduce the power consumption of the sensing element, improving the usage efficiency of the refrigerant sensor.

[0009] Specifically, in the refrigeration mode, increasing the non - energized time ratio (A1 > A0) reduces the power consumption of the sensing element compared with the stop operation mode, thereby reducing the deterioration speed of the sensor element; in the heating mode, reducing the non - energized time ratio (A2 < A0) ensures the detection sensitivity in a high - temperature environment while extending the service life of the sensing element by means of intermittent energization.

[0010] In an example of the present invention, during the intermittent operation of the energized mode and the non - energized mode of the sensing element, define one continuous operation of the energized mode and one non - energized mode of the sensing element as one energization cycle. The first energization control mode includes: Obtain the first operation time when the sensing element is in the energized mode and the second operation time when the sensing element is in the non - energized mode; Calculate the energization cycle according to the first operation time and the second operation time; Calculate the non - energized time ratio of the sensing element according to the second operation time and the energization cycle.

[0011] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: This solution calculates the energization cycle of one continuous operation of the energized mode and one non - energized mode of the sensing element through the first operation time (energized mode) and the second operation time (non - energized mode), and calculates the non - energized time ratio based on the energization cycle and the second operation time (non - energized mode), realizing precise control of the working state of the sensing element. Further, based on the quantitative control method of time parameters, the energized time and non - energized time of the sensing element can be measured and controlled, and the energization cycle of the sensing element can be flexibly adjusted according to the actual operation situation, thereby extending the service life of the sensing element while ensuring the detection effect.

[0012] In an example of the present invention, the first operating time is defined as t1, the second operating time is defined as t2, and the first power-on control mode further includes: According to the first operating time and the second operating time, the calculation formula for the power-on cycle is: T = t1 + t2; According to the second operating time and the power-on cycle, the calculation formula for the non-power-on time ratio of the sensing element is: Formula 1: ; where A is the non-power-on time ratio.

[0013] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: This solution improves the accuracy of the calculation result of the non-power-on time ratio, and further realizes the precise control of the working state of the sensing element.

[0014] In an example of the present invention, the refrigerant parameter includes the first temperature of the refrigerant medium, the indoor parameter includes the indoor temperature, and according to the indoor parameter and the refrigerant parameter, the working mode of the air conditioner is judged, including: According to the magnitude relationship between the first temperature and the indoor temperature, the working mode of the air conditioner is judged.

[0015] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: This solution judges the working mode of the air conditioner based on the temperature parameter, and can quickly and accurately identify the working mode of the air conditioner. Specifically, the temperature sensor responds quickly and can reflect the environmental changes in real time, improving the judgment accuracy of the refrigerant sensor.

[0016] In an example of the present invention, the first temperature is defined as T1, the indoor temperature is defined as T2, and according to the magnitudes of the first temperature and the indoor temperature, the working mode of the air conditioner is judged, including: If T1 < T2, it is determined that the working mode is the cooling mode; If T1 = T2, it is determined that the working mode is the stop operation mode; If T1 > T2, it is determined that the working mode is the heating mode.

[0017] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: This solution can accurately judge the working mode (cooling, heating or stop operation) of the air conditioner by comparing the magnitude relationship between the refrigerant temperature (T1) of the refrigerant medium and the indoor temperature (T2). Specifically, judging based on the temperature parameter can quickly respond to the changes in the environmental temperature and adjust the working state of the air conditioner in real time, thereby improving the operation efficiency of the refrigerant leakage detection system and the user experience.

[0018] In one embodiment of the present invention, the refrigerant parameter further includes a first pressure of the refrigerant when the working mode is a stop mode, the refrigerant parameter further includes a second pressure of the refrigerant when the working mode is a cooling mode, and a third pressure of the refrigerant when the working mode is a heating mode; according to the working mode, controlling the sensor element to enter the first power-on control mode includes: When the refrigerant leaks, obtaining a first leakage amount of the refrigerant when the working mode is a stop operation mode after the sensing element continuously operates for one power-on cycle; Calculating, according to the first pressure and the second pressure, a first non-power-on time of the sensor element when the refrigerant medium reaches a first leakage amount in the refrigeration mode; The second non-power-off time of the sensor element when the refrigerant reaches a first leakage amount in the heating mode is calculated according to the first pressure and the third pressure.

[0019] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: This solution uses the pressure parameters of the refrigerant medium to calculate the non-power-on time of the sensor element in different working modes (stop operation, cooling, heating), thereby realizing precise control of the sensor element. Specifically, the control method based on the pressure parameter calculates the non-power-on time of the sensor element, and the pressure sensor can provide stable and reliable data to ensure the accuracy of the control of the non-power-on time of the sensor element.

[0020] In one embodiment of the present invention, the non-power-on time of the sensor element when the working mode is the stop operation mode is t0; According to the first pressure and the second pressure, the calculation formula for the first non-power-on time of the sensor element when the working mode is the cooling mode and the refrigerant medium reaches the first leakage amount is calculated as follows: Formula 2: ; According to the first pressure and the third pressure, the calculation formula for calculating the second non-power-on time of the sensor element when the refrigerant medium reaches the first leakage amount in the heating mode is: Formula 3: ; Wherein, t3 is the first non-power-on time, t4 is the second non-power-on time, P1 is the first pressure, P2 is the second pressure, and P3 is the third pressure.

[0021] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: this solution calculates the non-power-on time of the sensor element through the pressure parameters of the air conditioner in different working modes, thereby avoiding the error caused by the absolute pressure value; further, the non-power-on time (t0) of the sensor element when the air conditioner is in the stop mode is used as a benchmark, thereby improving the accuracy of controlling the non-power-on time of the sensor element.

[0022] In an example of the present invention, the refrigerant sensor further includes a control unit communicatively connected to the sensing element. The maximum concentration allowing refrigerant medium leakage indoors is defined as the first concentration. The first power-on regulation mode further includes: When the refrigerant medium leaks, the sensing element sends an alarm signal to the control unit and obtains the leakage rate of the refrigerant medium and the indoor volume. According to the leakage rate and the indoor volume, calculate the leakage time required for the refrigerant medium leaking into the room to reach the first concentration. According to the leakage time, control the sensing element to enter the second power-on regulation mode.

[0023] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: When the refrigerant leaks, the sensing element sends an alarm signal to the control unit and calculates the time required for the refrigerant medium leaking into the room to reach the maximum allowable concentration, enabling the sensing element to respond quickly when the refrigerant medium leaks, thereby reducing potential safety hazards and improving the safety of the air conditioner during use.

[0024] In an example of the present invention, the combustion limit concentration of the refrigerant medium is defined as C, and the preset first concentration is C. The first power-on regulation mode further includes: The calculation formula for the leakage time required for the refrigerant medium leaking into the room to reach the combustion limit according to the leakage rate and the indoor volume is: Formula 4: ; where t5 is the leakage time, a is the leakage rate, V is the indoor volume, is a preset value.

[0025] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: By calculating the time required for the refrigerant medium to leak into the room to reach the combustion limit concentration, preventive measures can be taken before potential hazards occur, further improving the safety of the air conditioner during use.

[0026] In an example of the present invention, the second power-on regulation mode includes: During the intermittent operation of the sensing element in the powered-on mode and the non-powered-on mode, when the sensing element detects the leakage of the refrigerant medium and T < t5, control the sensing element to change from the intermittent operation to the continuous power-on operation.

[0027] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: When refrigerant leakage is detected and T < t5, the sensing element is switched from intermittent operation to continuous power-on mode in this solution, so as to increase the detection frequency before the refrigerant medium leaks into the room and reaches the combustion limit concentration, ensure real-time monitoring of the leakage situation, improve the reliability and safety of the refrigerant leakage detection system, and at the same time extend the service life of the sensing element; In addition, by judging the relationship between the leakage time and the power-on cycle, the refrigerant leakage detection system can intelligently adjust the power-on mode to avoid false alarms and missed alarms.

[0028] On the other hand, the present invention also provides a refrigerant detection system. The refrigerant detection system is used to execute the control method in any of the above technical solutions. The refrigerant detection system includes an acquisition module, a judgment module, and a control module; Specifically, the acquisition module is used to acquire the indoor parameters of the room and acquire the refrigerant parameters of the refrigerant medium. The judgment module is used to judge the working mode of the air conditioner according to the indoor parameters and the refrigerant parameters. The control module is used to control the sensing element to enter the first power-on regulation mode according to the working mode.

[0029] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows.

[0030] After adopting the technical solution of the present invention, the following technical effects can be achieved: A control method and a refrigerant detection system for a refrigerant leakage detection system provided by the present invention avoid the sensing element being in a powered-on state for a long time by controlling the intermittent operation of the sensing element in the powered-on mode and the non-powered-on mode according to the working mode of the air conditioner, and effectively extend the service life of the sensing element. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts; Figure 1 It is a flowchart of a control method for a refrigerant leakage detection system provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of the elapsed time of one continuous operation of the sensing element in the powered-on mode and one non-powered-on mode provided by an embodiment of the present invention; Figure 3 It is a schematic diagram of the modules of a refrigerant detection system provided by an embodiment of the present invention.

[0032] Description of the reference numerals: 100, acquisition module; 200, judgment module; 300, control module. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0034] To solve the above problems, on the one hand, Figure 1 As shown, the present invention provides a control method for a refrigerant leakage detection system, which is applied to an air conditioner, the air conditioner includes an indoor heat exchanger and a refrigerant sensor, the refrigerant sensor includes a sensor element for detecting refrigerant leakage in the indoor heat exchanger, and the control method includes: S100: Acquire indoor parameters of the room and obtain refrigerant parameters of the refrigerant medium; S200: judging the working mode of the air conditioner according to indoor parameters and refrigerant parameters; S300: According to the working mode, controlling the sensor element to enter a first power-on control mode; The first power-on control mode includes controlling the sensor element to operate intermittently in a power-on mode and a non-power-on mode.

[0035] This solution controls the sensor element to operate intermittently in a power-on mode and a non-power-on mode according to the working mode of the air conditioner, thereby avoiding the sensor element being in a power-on state for a long time and effectively extending the service life of the sensor element.

[0036] It should be noted that the detection method of the sensor element provided in the embodiment of the present invention includes any one of semiconductor type, infrared type, and thermal conductivity type. Preferably, the detection method of the sensor element is semiconductor type.

[0037] In one embodiment of the present invention, the working mode includes a cooling mode, a heating mode, and a stop mode, and the non-power-on time ratio of the sensor element when the working mode includes the stop mode is defined as A0, and the first power-on control mode also includes: When the working mode includes cooling mode, control A1>A0; When the working mode includes heating mode, control A2 <A0; Wherein, A1 is the non-power-on time ratio when the air conditioner is in cooling mode, and A2 is the non-power-on time ratio when the air conditioner is in heating mode.

[0038] This solution can ensure the refrigerant leakage detection function and reduce the power consumption of the sensor element by adjusting the non-power-on time ratio of the sensor element when the air conditioner is in different working modes, thereby improving the use efficiency of the refrigerant sensor.

[0039] Specifically, in the refrigeration mode, since the pressure of the refrigerant medium in the indoor heat exchanger is lower than that in the stop operation mode, when the refrigerant medium leaks, the leakage speed in the refrigeration mode is slower than that in the stop operation mode. By increasing the non - power - on time ratio (A1 > A0), compared with the stop operation mode, the power consumption of the sensing element is reduced, thereby reducing the deterioration speed of the sensor element and extending the service life of the refrigerant sensor. In the heating mode, the pressure of the refrigerant medium in the indoor heat exchanger is higher than that in the stop operation mode. When the refrigerant medium leaks, the leakage speed in the heating mode is faster than that in the stop operation mode. By reducing the non - power - on time ratio (A2 < A0), while extending the service life of the sensing element through intermittent power - on, the detection sensitivity in a high - temperature environment is ensured.

[0040] In an example of the present invention, during the intermittent operation of the power - on mode and the non - power - on mode of the sensing element, defining one continuous operation of the power - on mode and one non - power - on mode of the sensing element as one power - on cycle (as Figure 2 shown, taking Ton and Toff as one cycle, in the Ton stage, the sensor element is in the power - on mode, and in the Toff stage, the sensor element is in the non - power - on mode), the first power - on control mode includes: Obtaining the first operation time when the sensing element is in the power - on mode and the second operation time when the sensing element is in the non - power - on mode; Calculating the power - on cycle according to the first operation time and the second operation time; Calculating the non - power - on time ratio of the sensing element according to the second operation time and the power - on cycle.

[0041] This solution calculates the power - on cycle of one continuous operation of the power - on mode and one non - power - on mode of the sensing element through the first operation time (power - on mode) and the second operation time (non - power - on mode), and calculates the non - power - on time ratio based on the power - on cycle and the second operation time (non - power - on mode), achieving precise control of the working state of the sensing element. Further, based on the quantitative control method of time parameters, the power - on time and non - power - on time of the sensing element are measurable and controllable, and the power - on cycle of the sensing element can be flexibly adjusted according to the actual operation situation, thereby extending the service life of the sensing element while ensuring the detection effect.

[0042] In an example of the present invention, defining the first operation time as t1 and the second operation time as t2, the first power - on control mode further includes: The calculation formula for calculating the power - on cycle according to the first operation time and the second operation time is: T = t1 + t2; The calculation formula for calculating the non - power - on time ratio of the sensing element according to the second operation time and the power - on cycle is: Formula 1: ; where A is the non - energized time ratio.

[0043] This solution improves the accuracy of the calculation result of the non - energized time ratio and further realizes the precise control of the working state of the sensing element.

[0044] In a specific embodiment, the first operating time when the sensing element is in the energized mode is 1 min, and the second operating time when the sensing element is in the non - energized mode is 1 min. Then the energization cycle of the sensing element is 2 min, and the non - energized time ratio of the sensing element is .

[0045] In an example of the present invention, the refrigerant parameters include the first temperature of the refrigerant medium, the indoor parameters include the indoor temperature. According to the indoor parameters and the refrigerant parameters, the working mode of the air conditioner is judged, including: Judging the working mode of the air conditioner according to the magnitude relationship between the first temperature and the indoor temperature.

[0046] This solution judges the working mode of the air conditioner based on the temperature parameters, and can quickly and accurately identify the working mode of the air conditioner. Specifically, the temperature sensor responds quickly and can reflect the changes in the environment in real time, improving the judgment accuracy of the refrigerant sensor.

[0047] In an example of the present invention, the first temperature is defined as T1, the indoor temperature is defined as T2. According to the magnitudes of the first temperature and the indoor temperature, the working mode of the air conditioner is judged, including: If T1 < T2, it is determined that the working mode is the cooling mode; If T1 = T2, it is determined that the working mode is the stop operation mode; If T1 > T2, it is determined that the working mode is the heating mode.

[0048] This solution can accurately judge the working mode (cooling, heating or stop operation) of the air conditioner by comparing the magnitude relationship between the refrigerant temperature (T1) of the refrigerant medium and the indoor temperature (T2). Specifically, judging based on the temperature parameters can quickly respond to the changes in the ambient temperature and adjust the working state of the air conditioner in real time, thereby improving the operation efficiency and user experience of the refrigerant leakage detection system.

[0049] In an example of the present invention, the refrigerant parameters further include the first pressure when the working mode of the refrigerant medium is the stop operation mode, the second pressure when the working mode of the refrigerant medium is the cooling mode, and the third pressure when the working mode of the refrigerant medium is the heating mode; according to the working mode, controlling the sensing element to enter the first energization regulation mode, including: When the refrigerant leaks, obtaining a first leakage amount of the refrigerant when the working mode is a stop operation mode after the sensing element continuously operates for one power-on cycle; Calculating, according to the first pressure and the second pressure, a first non-power-on time of the sensor element when the refrigerant medium reaches a first leakage amount in the refrigeration mode; The second non-power-off time of the sensor element when the refrigerant reaches a first leakage amount in the heating mode is calculated according to the first pressure and the third pressure.

[0050] This solution achieves precise control of the sensor element by using the pressure parameters of the refrigerant medium to calculate the non-power-on time of the sensor element in different working modes (stop operation, cooling, heating). Specifically, the control method based on the pressure parameters is used to calculate the non-power-on time of the sensor element. The pressure sensor can provide stable and reliable data to ensure the accuracy of the control of the non-power-on time of the control sensor element.

[0051] In one embodiment of the present invention, the non-power-on time of the sensor element when the working mode is the stop operation mode is t0; According to the first pressure and the second pressure, the calculation formula for the first non-power-on time of the sensor element when the working mode is the cooling mode and the refrigerant medium reaches the first leakage amount is calculated as follows: Formula 2: ; According to the first pressure and the third pressure, the calculation formula for calculating the second non-power-on time of the sensor element when the refrigerant medium reaches the first leakage amount in the heating mode is: Formula 3: ; Wherein, t3 is the first non-power-on time, t4 is the second non-power-on time, P1 is the first pressure, P2 is the second pressure, and P3 is the third pressure.

[0052] This solution calculates the non-power-on time of the sensor element through the pressure parameters of the air conditioner in different working modes, thereby avoiding the error caused by the absolute pressure value; further, the non-power-on time (t0) of the sensor element when the air conditioner is in the stop mode is used as a reference, thereby improving the accuracy of the non-power-on time control of the sensor element.

[0053] In a specific embodiment, assuming that the first operating time of the sensor element in the power-on mode when the air conditioner is in the stop mode is 1 minute, and the second operating time in the non-power-on mode is t0=1 minute, T=1min+1min=2min, then the non-power-on time ratio of the sensor element in the stop mode is , assuming that the temperature of the refrigerant in the air conditioner is 20℃ when it is in the stop mode, according to the ph line diagram, it can be found that the first pressure of the refrigerant is P1=1.5MPa, assuming that the temperature of the refrigerant in the air conditioner is 5℃ when it is in the cooling mode, according to the ph line diagram, it can be found that the second pressure of the refrigerant is P2=1MPa, in order to make the leakage of the refrigerant in the cooling mode and the stop mode the same, the non-power-on time of the sensor element when the air conditioner is in the cooling mode is: ; Therefore, the non-power-on time ratio of the sensor element when the air conditioner is in cooling mode is , and then A1>A0; Assume that the temperature of the refrigerant medium is 50℃ when the air conditioner is in heating mode. According to the pH line diagram, it can be found that the third pressure of the refrigerant medium is P3=3.1MPa. In order to make the leakage of the refrigerant medium when the air conditioner is in heating mode and in stop mode the same, the non-power-on time of the sensor element when the air conditioner is in heating mode is: ; Therefore, the non-power-on time ratio of the sensor element when the working mode of the air conditioner is the heating mode is , therefore, A0>A2, achieving the need to extend the service life of the sensor element.

[0054] In one embodiment of the present invention, the refrigerant sensor further includes a control unit in communication with the sensor element, defining a maximum concentration of refrigerant leakage allowed indoors as a first concentration, and the first power-on control mode further includes: When the refrigerant leaks, the sensor element sends an alarm signal to the control unit and obtains the leakage rate of the refrigerant and the indoor volume of the room; According to the leakage rate and the indoor volume, the leakage time required for the refrigerant leaked into the room to reach the first concentration is calculated; According to the leakage time, the sensing element is controlled to enter the second power-on regulation mode.

[0055] In this solution, when the refrigerant leaks, the sensor element sends an alarm signal to the control unit and calculates the time required for the refrigerant leaked into the room to reach the maximum allowable concentration, so that the sensor element can respond quickly when the refrigerant leaks, thereby reducing potential safety hazards and improving the safety of the air conditioner during use.

[0056] In one embodiment of the present invention, the combustion limit concentration of the coolant is defined as C, and the first concentration is preset as C. The first power-on control mode also includes: According to the leakage rate and the indoor volume, the calculation formula for the leakage time required for the refrigerant medium leaked into the room to reach the combustion limit is: Formula 4: ; Wherein, t5 is the leakage time, a is the leakage rate, is the indoor volume, is a preset value.

[0057] By calculating the time required for the refrigerant medium to leak into the room to reach the combustion limit concentration, this solution can take preventive measures before potential hazards occur, further improving the safety of the air conditioner during use.

[0058] In an example of the present invention, the second power-on control mode includes: During the intermittent operation of the sensing element in the powered-on mode and the non-powered-on mode, when the sensing element detects a leakage of the refrigerant medium and T < t5, the sensing element is controlled to switch from the intermittent operation action to the continuous power-on action.

[0059] By switching the sensing element from intermittent operation to continuous power-on mode when refrigerant leakage is detected and T < t5, this solution can increase the detection frequency before the refrigerant medium leaks into the room to reach the combustion limit concentration, ensuring that the refrigerant sensor can reliably detect the threshold concentration, improving the reliability and safety of the refrigerant leakage detection system, and also extending the service life of the sensing element; in addition, by judging the relationship between the leakage time and the power-on cycle, the refrigerant leakage detection system can intelligently adjust the power-on mode to avoid false alarms and missed alarms.

[0060] In a specific embodiment, the refrigerant medium in the indoor heat exchanger provided by the embodiment of the present invention is R32 (whose chemical composition is difluoromethane), and the combustion limit concentration of R32 is C = 0.307 kg / m 3 , assuming that the first operating time of the sensing element in the powered-on mode is 1 min and the second operating time in the non-powered-on mode is 1 min, then T = 1 min + 1 min = 2 min. Assuming a = 10 kg / h and V = 22 m 3 , , then the leakage time required for the refrigerant medium leaked into the room to reach the combustion limit is: ; It can be seen from this that in a room with a volume of 22 m 3 , under the maximum leakage condition, the maximum concentration of the refrigerant medium allowed to leak indoors will be reached 10 minutes after the leakage starts. , so when Ton = 1 minute and toff = 1 minute, it can be repeated 5 times within 10 minutes. At the worst condition where the sensing element enters the non-powered mode at the moment of the 5th cycle of continuous intermittent operation and reaches the first concentration, the sensor element enters the powered mode after 1 minute, and an alarm is sent to the control unit after 1 minute, with a 2-minute delay compared to the case of continuous power-on detection. Therefore, when refrigerant leakage is detected and T < t5 = 10 min, the sensing element is switched from intermittent operation to continuous power-on mode to increase the detection frequency before the refrigerant medium leaks into the room and reaches the combustion limit concentration, avoiding the above-mentioned situation where, at the worst condition where the sensing element enters the non-powered mode at the moment of the last cycle of continuous intermittent operation and reaches the first concentration, there is a 2-minute delay compared to the case of continuous power-on detection.

[0061] On the other hand, as Figure 3 shown, the present invention also provides a refrigerant detection system. The refrigerant detection system is used to execute the control method in any of the above technical solutions. The refrigerant detection system includes an acquisition module 100, a judgment module 200, and a control module 300. Specifically, the acquisition module 100 is used to acquire the indoor parameters of the room and the refrigerant parameters of the refrigerant medium. The judgment module 200 is used to judge the working mode of the air conditioner according to the indoor parameters and the refrigerant parameters. The control module 300 is used to control the sensing element to enter the first power-on regulation mode according to the working mode.

[0062] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.

Claims

1. A control method for a refrigerant leakage detection system, characterized in that: Applied to an air conditioner, the air conditioner includes an indoor heat exchanger and a refrigerant sensor, the refrigerant sensor includes a sensing element for detecting refrigerant medium leakage in the indoor heat exchanger, and the control method includes: Obtain indoor parameters of the room and obtain refrigerant parameters of the refrigerant medium; Judge the operating mode of the air conditioner according to the indoor parameters and the refrigerant parameters; Control the sensing element to enter the first power-on regulation mode according to the operating mode; Wherein, the first power-on regulation mode includes controlling the sensing element to operate intermittently between a powered-on mode and a non-powered-on mode.

2. The control method according to claim 1, characterized in that: The operating mode includes a cooling mode, a heating mode, and a stop operation mode. Define the non-powered-on time ratio of the sensing element when the operating mode includes the stop operation mode as A0, and the first power-on regulation mode further includes: When the operating mode includes the cooling mode, control A1 > A0; When the operating mode includes the heating mode, control A2 < A0; Wherein, A1 is the non-powered-on time ratio when the air conditioner is in the cooling mode, and A2 is the non-powered-on time ratio when the air conditioner is in the heating mode.

3. The control method according to claim 2, characterized in that: During the intermittent operation of the sensing element between the powered-on mode and the non-powered-on mode, define one continuous operation of the sensing element in the powered-on mode and one non-powered-on mode as one power-on cycle, and the first power-on regulation mode includes: Obtain the first operation time of the sensing element in the powered-on mode and the second operation time of the sensing element in the non-powered-on mode; Calculate the power-on cycle according to the first operation time and the second operation time; Calculate the non-powered-on time ratio of the sensing element according to the second operation time and the power-on cycle.

4. The control method according to claim 3, characterized in that: Define the first operation time as t1 and the second operation time as t2, and the first power-on regulation mode further includes: The calculation formula for calculating the power-on cycle according to the first operation time and the second operation time is: T = t1 + t2; The calculation formula for calculating the non-powered-on time ratio of the sensing element according to the second operation time and the power-on cycle is: Formula 1: ; Wherein, A is the non-powered-on time ratio.

5. The control method according to claim 2, characterized in that: The refrigerant parameters include the first temperature of the refrigerant medium, the indoor parameters include the indoor temperature, and judging the operating mode of the air conditioner according to the indoor parameters and the refrigerant parameters includes: Judge the operating mode of the air conditioner according to the magnitude relationship between the first temperature and the indoor temperature.

6. The control method according to claim 5, characterized in that: Define the first temperature as T1 and the indoor temperature as T2, and judging the operating mode of the air conditioner according to the magnitudes of the first temperature and the indoor temperature includes: If T1 < T2, then determine that the operating mode is the cooling mode; If T1 = T2, then determine that the operating mode is the stop operation mode; If T1 > T2, then determine that the operating mode is the heating mode.

7. According to the control method described in claim 2, characterized in that, The refrigerant parameters further include a first pressure of the refrigerant medium when the operating mode is the stopped operation mode, the refrigerant parameters further include a second pressure of the refrigerant medium when the operating mode is the refrigeration mode, and a third pressure of the refrigerant medium when the operating mode is the heating mode; the controlling the sensing element to enter the first power-on regulation mode according to the operating mode includes: When the refrigerant medium leaks, obtaining a first leakage amount of the refrigerant medium when the sensing element operates continuously for one power-on cycle and the operating mode is the stopped operation mode; According to the first pressure and the second pressure, calculating a first non-power-on time of the sensing element when the refrigerant medium reaches the first leakage amount in the refrigeration mode of the operating mode; According to the first pressure and the third pressure, calculating a second non-power-on time of the sensing element when the refrigerant medium reaches the first leakage amount in the heating mode of the operating mode.

8. The control method according to claim 7, characterized in that: Let the non-power-on time of the sensing element when the operating mode is the stopped operation mode be t0; The calculation formula for calculating the first non-power-on time of the sensing element when the refrigerant medium reaches the first leakage amount in the refrigeration mode of the operating mode according to the first pressure and the second pressure is: Formula 2: ; The calculation formula for calculating the second non-power-on time of the sensing element when the refrigerant medium reaches the first leakage amount in the heating mode of the operating mode according to the first pressure and the third pressure is: Formula 3: ; Wherein, t3 is the first non-power-on time, t4 is the second non-power-on time, P1 is the first pressure, P2 is the second pressure, and P3 is the third pressure.

9. The control method according to claim 2, characterized in that: The refrigerant sensor further includes a control unit communicatively connected to the sensing element. Defining the maximum concentration of the refrigerant medium allowed to leak indoors as the first concentration, the first power-on regulation mode further includes: When the refrigerant medium leaks, the sensing element sends an alarm signal to the control unit, and obtains the leakage speed of the refrigerant medium and the indoor volume of the room; According to the leakage speed and the indoor volume, calculating the leakage time required for the refrigerant medium leaking into the room to reach the first concentration; According to the leakage time, controlling the sensing element to enter the second power-on regulation mode.

10. The control method according to claim 9, characterized in that: Define the combustion limit concentration of the coolant as C, and preset the first concentration as C. The first power-on control mode further includes: The calculation formula for calculating the leakage time required for the refrigerant medium leaking into the room to reach the combustion limit according to the leakage speed and the indoor volume is: Formula 4: ; Wherein, t5 is the leakage time, a is the leakage rate, V is the indoor volume, is the default value.

11. The control method according to claim 10, characterized in that: The second power-on regulation mode includes: During the intermittent operation of the sensing element in the power-on mode and the non-power-on mode, when the sensing element detects that the refrigerant medium leaks and T < t5, controlling the sensing element to change from the intermittent operation action to the continuous power-on action.

12. A refrigerant detection system, characterized in that: The refrigerant detection system is used to execute the control method according to any one of claims 1 to 10, and the refrigerant detection system includes: An acquisition module (100), the acquisition module (100) is used to acquire indoor parameters of the room and to acquire refrigerant parameters of the refrigerant medium; A judgment module (200), the judgment module (200) is used to judge the working mode of the air conditioner according to indoor parameters and refrigerant parameters; The control module (300) is used to control the sensor element to enter a first power-on control mode according to the working mode.

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