Liquid leakage detection method of liquid circulation system, liquid leakage detection equipment and storage medium

Abstract

The invention discloses a liquid leakage detection method of a liquid circulation system, liquid leakage detection equipment and a storage medium. The liquid circulation system comprises end equipment, a circulating pump and a control valve, and the method comprises the steps that pressure state parameters and temperature state parameters of circulating liquid in the liquid circulation system in a target time period are obtained; determining a liquid leakage characteristic value in the target time period according to the pressure state parameter and the temperature state parameter; and when the liquid leakage characteristic value meets a preset liquid leakage condition of the liquid circulation system, determining that the liquid circulation system has a liquid leakage risk. The invention aims to improve the timeliness of liquid leakage risk identification of the liquid circulation system.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical appliances, and particularly to a method for detecting liquid leakage in a liquid circulation system, a liquid leakage detection device, and a storage medium. Background Art

[0002] Many electrical appliances are provided with a liquid circulation system (such as the water circuit system of an environmental conditioning device), which transfers energy through liquid circulation to meet user needs.

[0003] During the use of the liquid circulation system, when situations such as pipeline aging, abnormal corrosion, or external force damage occur, liquid leakage will occur. Currently, the liquid leakage situation of the system is generally detected manually, which is prone to untimely discovery of liquid leakage and resulting in system damage. Summary of the Invention

[0004] The main purpose of the present invention is to provide a method for detecting liquid leakage in a liquid circulation system, a liquid leakage detection device, and a storage medium, aiming to improve the timeliness of identifying the liquid leakage risk of the liquid circulation system.

[0005] To achieve the above object, the present invention provides a method for detecting liquid leakage in a liquid circulation system, and the method for detecting liquid leakage in the liquid circulation system includes the following steps:

[0006] Obtain the pressure state parameter and temperature state parameter of the circulating liquid in the liquid circulation system within a target time period;

[0007] Determine the liquid leakage characteristic value within the target time period according to the pressure state parameter and temperature state parameter;

[0008] When the liquid leakage characteristic value meets the preset condition of liquid leakage in the liquid circulation system, determine that the liquid circulation system has a liquid leakage risk.

[0009] Optionally, the liquid leakage characteristic value includes the pressure drop value of the circulating liquid within the target time period, and the preset condition includes that the pressure drop value is greater than or equal to a preset value.

[0010] Optionally, the liquid leakage characteristic value includes the pressure drop value of the circulating liquid within the target time period, and the step of determining the liquid leakage characteristic value within the target time period according to the pressure state parameter and temperature state parameter includes:

[0011] Determine the reference value of the pressure drop of the circulating liquid within the target time period according to the pressure state parameter;

[0012] Determine the target pressure correction value according to the pressure state parameter and the temperature state parameter;

[0013] Correct the reference value according to the target pressure correction value to obtain the pressure drop value.

[0014] Optionally, the pressure state parameter includes a first pressure at the start time of the target time period, a second pressure at the end time of the target time period, and a pressure change value when the operating state of the liquid circulation system changes within the target time period. The step of determining a reference value for the pressure drop of the circulating liquid within the target time period according to the pressure state parameter includes:

[0015] Determining the difference between the first pressure and the second pressure as the reference value;

[0016] The step of determining a target pressure correction value according to the pressure state parameter and the temperature state parameter includes:

[0017] Determining the target pressure correction value according to the pressure change value and the temperature state parameter.

[0018] Optionally, the temperature state parameter includes a first temperature at the start time of the target time period and a second temperature at the end time of the target time period. The step of determining the target pressure correction value according to the pressure change value and the temperature state parameter includes:

[0019] Determining a first pressure correction value according to the pressure change value;

[0020] Determining a second pressure correction value according to the first temperature and the second temperature;

[0021] Determining the target pressure correction value according to the first pressure correction value and the second pressure correction value.

[0022] Optionally, the step of determining the second pressure correction value according to the first temperature and the second temperature includes:

[0023] Determining a volume change value of the circulating liquid in the liquid circulation system within the target time period according to the first temperature and the second temperature;

[0024] Determining the second pressure correction value according to the volume change value.

[0025] Optionally, the liquid circulation system further includes an expansion tank. Before the step of determining the second pressure correction value according to the volume change value, it further includes:

[0026] Obtaining the volume of the expansion tank and the gas pre-charge pressure of the expansion tank;

[0027] Establishing a target correspondence relationship between the volume change value and the second pressure correction value according to the volume and the gas pre-charge pressure;

[0028] The step of determining the second pressure correction value according to the volume change value includes:

[0029] Based on the target correspondence, determine the second pressure correction value corresponding to the volume change value.

[0030] Optionally, the step of determining the volume change value of the circulating liquid in the liquid circulation system during the target time period according to the first temperature and the second temperature includes:

[0031] Determine the first density of the circulating liquid in the liquid circulation system at the starting moment according to the first temperature, and determine the second density of the circulating liquid in the liquid circulation system at the ending moment according to the second temperature;

[0032] Determine the density difference between the first density and the second density;

[0033] Determine the volume change value according to the density difference and the mass of the filling liquid in the liquid circulation system.

[0034] Optionally, the liquid circulation system includes an end device, a circulation pump, and a control valve. The control valve is used to control the fluid flow rate in the end device. The step of obtaining the pressure change value includes:

[0035] Determine that the device with a switching action in the circulation pump and the control valve during the target time period is the target load, obtain the change value of the fluid pressure detected by the liquid circulation system before and after the switching action of the target load, and determine the pressure change value according to the change value of the fluid pressure.

[0036] Optionally, the liquid circulation system includes at least two end devices and at least two control valves. The end devices and the control valves are arranged in one-to-one correspondence. The step of determining the pressure change value according to the change value includes:

[0037] Obtain the change value of the target ratio before and after the switching action of the target load. The target ratio is the ratio of the number of opened control valves to the number of closed control valves;

[0038] Correct the change value of the fluid pressure according to the change value of the ratio to obtain the pressure change value.

[0039] In addition, to achieve the above object, the present application also proposes a liquid leakage detection device. The liquid leakage detection device includes: a memory, a processor, and a liquid circulation system leakage detection program stored on the memory and executable on the processor. When the liquid circulation system leakage detection program is executed by the processor, it implements the steps of the liquid circulation system leakage detection method described in any one of the above.

[0040] In addition, to achieve the above object, the present application further provides a storage medium, on which a liquid leakage detection program for a liquid circulation system is stored. When the liquid leakage detection program for the liquid circulation system is executed by a processor, the steps of the liquid leakage detection method for the liquid circulation system described in any one of the above are implemented.

[0041] A liquid leakage detection method for a liquid circulation system proposed by the present invention determines a liquid leakage characteristic value within a target time period by combining the pressure state parameter and the temperature state parameter of the circulating liquid in the liquid circulation system. When the liquid leakage characteristic value meets the liquid leakage condition, it is determined that there is a liquid leakage risk in the liquid circulation system, so that the monitoring of the liquid leakage situation of the system can be realized during the operation of the system without manual participation, effectively improving the timeliness of identifying the liquid leakage risk of the liquid circulation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic structural diagram of an embodiment of the liquid circulation system of the present invention and its heat exchange connection with a heat pump system;

[0043] Figure 2 It is a schematic hardware structure diagram involved in the operation of an embodiment of the liquid circulation system of the present invention;

[0044] Figure 3 It is a schematic flowchart of an embodiment of the liquid leakage detection method for the liquid circulation system of the present invention;

[0045] Figure 4 It is a schematic flowchart of another embodiment of the liquid leakage detection method for the liquid circulation system of the present invention;

[0046] Figure 5 It is a schematic flowchart of still another embodiment of the liquid leakage detection method for the liquid circulation system of the present invention.

[0047] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0048] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0049] An embodiment of the present invention provides a liquid leakage detection device 100. In this embodiment, the liquid leakage detection device 100 is an environmental conditioning device with a liquid leakage detection function. The environmental conditioning device includes a liquid circulation system 1 and the liquid leakage detection device 100, and the liquid circulation system 1 is connected to the liquid leakage detection device 100. The environmental conditioning system includes a heat pump system 2 and the liquid circulation system 1, and the heat pump system 2 is heat-exchange connected to the liquid circulation system 1. In other embodiments, the liquid leakage detection device 100 can also be other detection devices independently provided from the liquid circulation system 1, and the liquid leakage detection device 100 is connected to the liquid circulation system 1.

[0050] In this embodiment, referring to Figure 1 , the liquid circulation system 1 detected by the liquid leakage detection device 100 includes a circulation pump 11, a control valve 12, and a terminal device 13.

[0051] The circulation pump 11 is used to drive the liquid to circulate in the liquid circulation system 1.

[0052] The control valve 12 is used to control the fluid flow rate in the terminal device 13.

[0053] The terminal device 13 is arranged in the indoor environment and uses the energy output by the flowing coolant to adjust the indoor environment. Among them, the terminal device 13 includes a convective heat exchange device or a radiative heat exchange device. For example, the terminal device 13 can include a fan coil unit, a radiator, a floor heating system, etc.

[0054] The number of the terminal devices 13 can be one or more than one. More than one terminal device 13 can be respectively arranged in different indoor spaces, and the types of the terminal devices 13 in different indoor spaces can be the same or different.

[0055] In this embodiment, the liquid circulation system 1 includes at least two terminal devices 13 and at least two control valves 12, and the terminal devices 13 and the control valves 12 are connected in series one by one.

[0056] The liquid circulation system 1 further includes a temperature sensor 01, which is arranged in the pipeline of the liquid circulation system 1 to detect the temperature of the circulating liquid.

[0057] The liquid circulation system 1 further includes a pressure sensor 02, which is arranged in the pipeline of the liquid circulation system 1 to detect the pressure of the circulating liquid.

[0058] Furthermore, the liquid circulation system 1 further includes an expansion tank 14.

[0059] Furthermore, the liquid circulation system 1 further includes a heat exchange part, and the heat exchange part is heat-exchange connected to the heat exchanger in the heat pump system 2. The above-mentioned temperature sensor 01 and pressure sensor 02 can be arranged on the liquid inlet side of the heat exchange part.

[0060] In an embodiment of the present invention, referring toFigure 2 The liquid leakage detection device 100 includes: a processor 1001, such as a CPU, a memory 1002, and a timer 1003. Among them, these components are connected and communicate with each other through a communication bus. The memory 1002 can be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. Optionally, the memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0061] The liquid leakage detection device 100 is connected to the above-mentioned temperature sensor 01 to obtain the temperature detection data of the temperature sensor 01.

[0062] The liquid leakage detection device 100 is connected to the above-mentioned pressure sensor 02 to obtain the pressure detection data of the pressure sensor 02.

[0063] The liquid leakage detection device 100 is connected to the above-mentioned circulation pump 11 to obtain the operation status data of the circulation pump 11.

[0064] The liquid leakage detection device 100 is connected to the above-mentioned control valve 12 to obtain the operation status data of the control valve 12.

[0065] Those skilled in the art can understand that Figure 2 the device structure shown in

[0066] does not constitute a limitation to the device, and may include more or fewer components than shown in the figure, or combine some components, or have different component arrangements. Figure 2 As shown in

[0067] In Figure 2 the device shown, the processor 1001 can be used to call the liquid leakage detection program stored in the memory 1002 and execute the relevant step operations of the liquid leakage detection method of the liquid circulation system in the following embodiments.

[0068] An embodiment of the present invention also provides a liquid leakage detection method for a liquid circulation system, which is applied to the above-mentioned liquid leakage detection device.

[0069] Referring to Figure 3 a liquid leakage detection method for the liquid circulation system of the present application is proposed in one embodiment. In this embodiment, the liquid leakage detection method for the liquid circulation system includes:

[0070] Step S10, obtaining the pressure state parameter and temperature state parameter of the circulating liquid in the liquid circulation system within a target time period;

[0071] The pressure state parameter can reflect the pressure conditions at different times within the target time period, and can include the instantaneous pressure value and / or the pressure change value. The pressure state parameter includes but is not limited to any one or more of the following: the pressure value at the start time, the pressure value at the end time, the pressure value at the intermediate time, the pressure change value within different sub-time periods, the pressure value or pressure change value when the components of the liquid circulation system operate to reach a preset condition. The pressure state parameter can be determined according to the pressure data detected by the pressure sensor.

[0072] The temperature state parameter can reflect the temperature conditions at different times within the target time period, and can include the instantaneous temperature value and / or the temperature change value. The temperature state parameter includes but is not limited to the following: the temperature value at the start time, the temperature value at the end time, the temperature value at the intermediate time, the temperature change value within different sub-time periods, the temperature value or temperature change value when the components of the liquid circulation system operate to reach a preset condition. The temperature state parameter can be determined according to the temperature data detected by the temperature sensor.

[0073] In this embodiment, the liquid circulation system is heat exchange connected to the heat pump system, and step S10 is executed when the heat pump system is in the on state.

[0074] Step S20, determining the liquid leakage characteristic value within the target time period according to the pressure state parameter and the temperature state parameter;

[0075] The liquid leakage characteristic value is a characteristic value characterizing the liquid leakage situation during the entire process of the target time period. The liquid leakage characteristic value can include the temperature value and / or the pressure value, etc. In this embodiment, the liquid leakage characteristic value includes the pressure drop value, and the pressure drop value specifically characterizes the pressure drop situation caused by liquid leakage during the entire process of the target time period.

[0076] Different pressure state parameters and different temperature state parameters correspond to different liquid leakage characteristic values. Specifically, the corresponding relationship between the pressure state parameter, the temperature state parameter and the liquid leakage characteristic value can be established in advance. The corresponding relationship can include forms such as calculation formulas and mapping relationships. Based on this corresponding relationship, the liquid leakage characteristic value corresponding to the pressure state parameter and the temperature state parameter can be determined.

[0077] In addition, to improve the detection accuracy, the correspondence between the pressure state parameter and the temperature state parameter and the liquid leakage characteristic value is obtained according to the actual operation of the liquid circulation system. Specifically, the heat exchange part of the liquid circulation system is heat-exchange connected to the heat pump system, and the liquid circulation system is heat-exchange connected to the gas system through a heat exchange device. When both the gas system and the heat pump system are turned on, the first temperature of the heat exchange part, the second temperature of the heat exchange device, and the ambient temperature of the environment where the liquid circulation system is located can be obtained. Based on the first temperature, the second temperature, and the ambient temperature, the target correspondence between the pressure state parameter, the temperature state parameter, and the liquid leakage characteristic value is obtained, and the liquid leakage characteristic value corresponding to the pressure state parameter and the temperature state parameter is determined based on the target correspondence.

[0078] Step S30, when the liquid leakage characteristic value meets the preset condition of liquid leakage in the liquid circulation system, it is determined that the liquid circulation system has a liquid leakage risk.

[0079] The preset condition is the target numerical range that the liquid leakage characteristic value needs to reach, or the target magnitude relationship or target quantity relationship with the target threshold value when the liquid circulation system leaks.

[0080] In this embodiment, the liquid leakage characteristic value includes the pressure drop value of the circulating liquid within the target time period, and the preset condition includes that the pressure drop value is greater than or equal to a preset value.

[0081] The preset value is specifically a value greater than 0. When the pressure drop value is greater than the preset value, it can be considered that the pressure in the liquid circulation system drops significantly due to liquid leakage. When it is determined that the liquid circulation system has a liquid leakage risk, a corresponding prompt message can be output. The prompt message includes one or more of forms such as text, image, sound, vibration, etc. The user can timely discover the liquid leakage situation of the liquid circulation system through the prompt message and perform maintenance; and / or, when it is determined that the liquid circulation system has a liquid leakage risk, the heat pump system heat-exchange connected to the liquid circulation system can be controlled to stop, and the circulation pump can be controlled to close. Alternatively, when it is determined that the liquid circulation system has a liquid leakage risk, the compressor in the heat pump system heat-exchange connected to the liquid circulation system is controlled to adjust the operating frequency. When the operating frequency adjustment duration reaches the preset duration, the pressure state parameter and the temperature state parameter of the circulating liquid in the liquid circulation system within the target time period are obtained. Based on the pressure state parameter and the temperature state parameter, the pressure drop value of the circulating liquid within the target time period is determined. When the pressure drop value is greater than the preset value, it is determined that the liquid circulation system has a liquid leakage fault, and the heat pump system is controlled to stop and a prompt message is output.

[0082] The preset value can be a pre-set fixed value or a value determined according to the actual operating state of the liquid circulation system. For example, the heat pump system is heat-exchange connected to the liquid circulation system. When the heat pump system operates in the cooling mode, the first value is determined as the preset value; when the heat pump system operates in the heating mode, the second value is determined as the preset value. Further, the number of opened control valves and the indoor ambient temperature of the space where the corresponding terminal device is located are obtained, and a correction value is determined according to the number and the corresponding indoor ambient temperature. When the heat pump system operates in the cooling mode, the first value is corrected according to the correction value to obtain the preset value; when the heat pump system operates in the heating mode, the second value is corrected according to the correction value to obtain the preset value. Based on this, it can be ensured that the situation where the circulating liquid in the system leaks and cannot meet the indoor heat exchange demand can be detected in time, which is beneficial to improving the comfort of the environment where the terminal device is located.

[0083] Further, after step S30, it is possible to return to execute step S10 at preset time intervals.

[0084] In addition, when the liquid leakage characteristic value does not meet the preset conditions for liquid leakage of the liquid circulation system, it can be determined that there is no liquid leakage risk in the liquid circulation system.

[0085] A liquid leakage detection method for a liquid circulation system proposed in an embodiment of the present invention determines the liquid leakage characteristic value within a target time period by combining the pressure state parameter and the temperature state parameter of the circulating liquid in the liquid circulation system. When the liquid leakage characteristic value meets the liquid leakage condition, it is determined that there is a liquid leakage risk in the liquid circulation system, so that the monitoring of the liquid leakage situation of the system can be realized during the operation of the system without manual participation, effectively improving the timeliness of identifying the liquid leakage risk of the liquid circulation system.

[0086] Further, based on the above embodiment, another embodiment of the liquid leakage detection method for the liquid circulation system of the present application is proposed. In this embodiment, the liquid leakage characteristic value includes the pressure drop value. Refer to Figure 4 , step S20 includes:

[0087] Step S21, determining a reference value for the pressure drop of the circulating liquid within the target time period according to the pressure state parameter;

[0088] In this embodiment, the pressure state parameter includes the first pressure at the start time of the target time period and the second pressure at the end time of the target time period. The first pressure and the second pressure can be detected by the above pressure sensor. The difference between the first pressure and the second pressure is determined as the reference value;

[0089] In other implementation manners, the pressure state parameter may also include the maximum pressure and the minimum pressure detected within the target time period, and the difference between the maximum pressure and the minimum pressure is determined as the reference value here.

[0090] In other implementation manners, the pressure state parameter may also include a second pressure at the end moment of the target time period, and the reference value here is calculated by looking up a table with the second pressure or substituting it into a formula.

[0091] Step S22: Determine a target pressure correction value according to the pressure state parameter and the temperature state parameter;

[0092] The target pressure correction value may be a correction amplitude value or a correction ratio.

[0093] Different pressure state parameters and different temperature state parameters correspond to different target pressure correction values. In one implementation manner, a first pressure correction value may be determined according to the pressure state parameter, a second pressure correction value may be determined according to the temperature state parameter, and the target pressure correction value may be determined according to the first pressure correction value and the second pressure correction value. In another implementation manner, a corresponding relationship between the pressure state parameter and the target pressure correction value may be obtained according to the temperature state parameter, different temperature state parameters correspond to different corresponding relationships, and the target pressure correction value corresponding to the pressure state parameter is determined based on this corresponding relationship. In yet another implementation manner, a corresponding relationship between the temperature state parameter and the target pressure correction value may be obtained according to the pressure state parameter, different pressure state parameters correspond to different corresponding relationships, and the target pressure correction value corresponding to the temperature state parameter may be determined based on this corresponding relationship.

[0094] In this embodiment, in addition to the above-mentioned first pressure and second pressure, the pressure state parameter further includes a pressure change value when the operating state of the liquid circulation system changes within the target time period, and the target pressure correction value is determined according to the pressure change value and the temperature state parameter.

[0095] In other implementation manners, the pressure value may be detected at intervals of a set time duration within the target time period to obtain a plurality of pressure values, and the pressure state parameter may further include these plurality of pressure values, and the target pressure correction value is determined according to the plurality of pressure values and the temperature state parameter. Alternatively, the pressure change value may be detected at intervals of a set time duration within the target time period to obtain a plurality of pressure change values, and the pressure state may further include the plurality of pressure change values, and the target pressure correction value is determined according to the plurality of pressure change values and the temperature state parameter.

[0096] Step S23: Correct the reference value according to the target pressure correction value to obtain the pressure drop value.

[0097] In one implementation manner, the calculation result obtained by subtracting the target pressure correction value from the reference value is used as the pressure drop value. For example, the pressure drop value = P1 - P2 - ΔP, where P1 is the first pressure, P2 is the second pressure, P1 - P2 is the reference value, and ΔP is the target pressure correction value.

[0098] In another implementation, the product of the reference value and the target pressure correction value is used as the pressure drop value.

[0099] In this embodiment, on the basis of determining the reference value of the pressure drop through the pressure state parameter, the reference value is corrected by combining the pressure state parameter and the temperature state parameter to obtain the pressure drop value, which helps to avoid the leakage identification error caused by temperature change and pressure change within the target time period, and ensures that the determined pressure drop value can accurately reflect the pressure change caused by liquid leakage rather than other factors, further improving the accuracy of liquid leakage detection in the liquid circulation system. Among them, on the basis of determining the reference value through the first pressure and the second pressure, the reference value is corrected by combining the pressure change value and the temperature state parameter to obtain the pressure drop value, which helps to further avoid the identification error caused by the pressure change due to the change of the system operation state, thereby further improving the accuracy of the pressure drop value and further improving the accuracy of liquid leakage detection in the liquid circulation system.

[0100] In other embodiments, the reference value can also be determined according to the pressure state parameter, and the reference value is corrected only according to the temperature state parameter to obtain the pressure drop value here.

[0101] Further, in this embodiment, the liquid circulation system includes an end device, a circulation pump, and a control valve. The control valve is used to control the fluid flow rate in the end device. The step of obtaining the pressure change value includes: determining the device that undergoes a switching action in the circulation pump and the control valve within the target time period as the target load, obtaining the change value of the fluid pressure detected by the liquid circulation system before and after the switching action of the target load occurs, and determining the pressure change value according to the change value of the fluid pressure.

[0102] The occurrence of a switching action includes switching from open to closed or from closed to open.

[0103] Among them, when switching from open to closed, the pressure change value can be the pressure increase amplitude, and when switching from closed to open, the pressure change value can be the pressure drop amplitude.

[0104] Obtain the pressure value detected by the pressure sensor at the starting moment when the target load undergoes a switching action as the first fluid pressure, and obtain the pressure value detected by the pressure sensor at the ending moment when the target load undergoes a switching action as the second fluid pressure. The difference between the first fluid pressure and the second fluid pressure is the change value here.

[0105] When the number of target loads is one and the number of switching actions occurring within the target time period is one, determine the change value of the fluid pressure as the pressure change value.

[0106] When the number of target loads is more than one, and / or, when a single target load undergoes a change value that can determine the fluid pressure detected before and after each switch action within a target time period, based on the sum of all change values corresponding to the target load, determine the total change value of the liquid for each load, and use the sum of the total change values of all target loads as the pressure change value here.

[0107] In this embodiment, the process of determining the pressure drop value applies the pressure change value caused by the switch action of the circulation pump and / or control valve in the liquid circulation system to correct the reference value, which helps to avoid incorrect leakage determination results caused by system pressure changes during the switchover of the circulation pump and control valve, so as to effectively improve the accuracy of leakage determination based on the pressure drop value.

[0108] Furthermore, in this embodiment, the liquid circulation system includes at least two of the terminal devices and at least two of the control valves, and the terminal devices and the control valves are arranged in one-to-one correspondence. The step of determining the pressure change value according to the change value includes: obtaining the ratio change value of a target ratio before and after the switch action of the target load, where the target ratio is the ratio of the number of opened control valves to the number of closed control valves; correcting the change value of the fluid pressure according to the ratio change value to obtain the pressure change value.

[0109] Obtain the first ratio of the number of opened control valves to the number of closed control valves before the switch action of the target load, obtain the second ratio of the number of opened control valves to the number of closed control valves after the switch action of the target load, and determine the difference or ratio between the first ratio and the second ratio as the ratio change value here.

[0110] Calculate the third pressure correction value according to the ratio change value, and the third pressure correction value is positively correlated with the ratio change value. Use the difference or product between the change value of the fluid pressure and the ratio change value as the pressure change value.

[0111] In this embodiment, due to different target ratios in the system, the resistance of fluid flow is different, and thus the influence on the pressure change is different. Therefore, correcting the change value of the fluid pressure in combination with the ratio change value to obtain the pressure change value helps to further improve the accuracy of leakage detection and identification.

[0112] Furthermore, based on any of the above embodiments, another embodiment of the leakage detection method for the liquid circulation system of the present application is proposed. In this embodiment, the temperature state parameter includes the first temperature at the start time of the target time period and the second temperature at the end time of the target time period. Refer to Figure 5 , the step of determining the target pressure correction value according to the pressure change value and the temperature state parameter includes:

[0113] Step S221, determine a first pressure correction value according to the pressure change value;

[0114] The pressure change value is positively correlated with the first pressure correction value.

[0115] Step S222, determine a second pressure correction value according to the first temperature and the second temperature;

[0116] A corresponding relationship between the first temperature, the second temperature and the second pressure correction value is established in advance. The corresponding relationship may include calculation formulas, mapping tables, etc. Based on this corresponding relationship, the second pressure correction value is determined by substituting the first temperature and the second temperature into a preset formula or looking up a table, etc.

[0117] In this embodiment, determine the volume change value of the circulating liquid in the liquid circulation system during the target time period according to the first temperature and the second temperature; determine the second pressure correction value according to the volume change value. The volume change value is positively correlated with the second pressure correction value. The corresponding relationship between the volume change value and the second pressure correction value can be set in advance and may include forms such as calculation formulas and mapping tables.

[0118] Specifically, in this embodiment, determine the first density of the circulating liquid in the liquid circulation system at the starting moment according to the first temperature, and determine the second density of the circulating liquid in the liquid circulation system at the ending moment according to the second temperature; determine the density difference between the first density and the second density; determine the volume change value according to the density difference and the mass of the liquid filled in the liquid circulation system. In this embodiment, the density is negatively correlated with the temperature, and a mapping table representing the relationship between the temperature and the density is set in advance. The matching result obtained by querying the mapping table with the first temperature is used as the first density, and the matching result obtained by querying the mapping table with the second temperature is used as the second density. In other embodiments, the first density calculated by substituting the first temperature into a preset relational expression and the second density calculated by substituting the second temperature into a preset relational expression can also be used. The calculation result obtained by subtracting the second density from the first density is used as the density difference. The ratio of the mass to the density difference is used as the volume change value. That is, the volume change value ΔV = M / (ρ0 - ρ1), where M is the mass, ρ0 is the first density, and ρ1 is the second density.

[0119] In other implementation manners, the second pressure correction value can be determined according to the temperature difference value between the first temperature and the second temperature. Or, determine the third pressure corresponding to the first temperature, determine the fourth pressure corresponding to the second temperature, and determine the second pressure correction value according to the third pressure and the fourth pressure.

[0120] Step S223, determine the target pressure correction value according to the first pressure correction value and the second pressure correction value.

[0121] In this embodiment, both the first pressure correction value and the second pressure correction value are pressure correction amplitudes, and the sum of the first pressure correction value and the second pressure correction value is determined as the target pressure correction value. In other embodiments, the first pressure correction value and the second pressure correction value can both be pressure correction coefficients, and the product of the first pressure correction value and the second pressure correction value can be determined as the target pressure correction value.

[0122] In this embodiment, determining the target pressure correction value in the above manner is beneficial to ensuring that the determined pressure drop value can exclude the influence of pressure changes caused by temperature changes, thereby further improving the accuracy of the pressure drop value and the characterization of the liquid leakage risk, and further improving the accuracy of liquid leakage detection.

[0123] In other embodiments, the third pressure corresponding to the first temperature and the fourth pressure corresponding to the second temperature can also be determined, the pressure difference between the third pressure and the fourth pressure is determined as the reference pressure change value, and the mean or maximum value of the reference value and the reference pressure change value is used as the above-mentioned pressure drop value.

[0124] Further, in this embodiment, the liquid circulation system further includes an expansion tank. Before the step of determining the second pressure correction value according to the volume change value, the method further includes: obtaining the volume of the expansion tank and the gas pre-charge pressure of the expansion tank; establishing a target correspondence relationship between the volume change value and the second pressure correction value according to the volume and the gas pre-charge pressure; the step of determining the second pressure correction value according to the volume change value includes: based on the target correspondence relationship, determining the second pressure correction value corresponding to the volume change value.

[0125] In this embodiment, the established target correspondence relationship is as follows: △P1 = Pg - Pg * Vg / (Vg - △V), where Pg is the gas pre-charge pressure, Vg is the volume of the expansion tank, △V is the volume change value, and △P1 is the second pressure correction value. Based on this formula, the volume change value can be substituted into this calculation formula to calculate the second pressure correction value.

[0126] In other embodiments, the target correspondence relationship can also include forms such as a mapping table.

[0127] In this embodiment, combining the state parameters of the expansion tank to establish the correspondence relationship between the volume change value and the second pressure correction value is beneficial to further improving the accuracy of the pressure drop value determined based on the second pressure correction value, so as to further improve the accuracy of liquid leakage detection.

[0128] In addition, an embodiment of the present invention further provides a storage medium, on which a liquid leakage detection program of the liquid circulation system is stored. When the liquid leakage detection program of the liquid circulation system is executed by a processor, the relevant steps of any embodiment of the above liquid leakage detection method of the liquid circulation system are implemented.

[0129] It should be noted that in this text, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or system. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or system including such element.

[0130] The serial numbers of the embodiments of the present invention above are only for description and do not represent the superiority or inferiority of the embodiments.

[0131] Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. This computer software product is stored in a storage medium as described above (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to enable a terminal device (which can be a mobile phone, computer, server, liquid circulation system, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0132] The above are only the preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A method for detecting leakage of a liquid circulation system, characterized in that: The liquid leakage detection method of the liquid circulation system comprises the following steps: Acquiring pressure state parameters and temperature state parameters of circulating liquid in the liquid circulation system within a target time period; Determining a liquid leakage characteristic value within the target time period according to the pressure state parameter and the temperature state parameter; When the liquid leakage characteristic value meets the preset condition of liquid leakage in the liquid circulation system, it is determined that there is a risk of liquid leakage in the liquid circulation system.

2. The method for detecting leakage of a liquid circulation system according to claim 1, characterized in that: The leakage characteristic value includes a pressure drop value of the circulating liquid within the target time period, and the preset condition includes that the pressure drop value is greater than or equal to a preset value.

3. The method for detecting leakage of a liquid circulation system according to claim 1, characterized in that: The leakage characteristic value includes a pressure drop value, and the step of determining the leakage characteristic value within the target time period according to the pressure state parameter and the temperature state parameter includes: Determine a reference value of the circulating liquid pressure drop within the target time period according to the pressure state parameter; Determine a target pressure correction value according to the pressure state parameter and the temperature state parameter; The reference value is corrected according to the target pressure correction value to obtain the pressure drop value.

4. The method for detecting leakage of a liquid circulation system according to claim 3, characterized in that: The pressure state parameters include a first pressure at the start time of the target time period, a second pressure at the end time of the target time period, and a pressure change value when the operating state of the liquid circulation system changes within the target time period. The step of determining a reference value of the circulating liquid pressure drop within the target time period according to the pressure state parameters includes: Determine the difference between the first pressure and the second pressure as the reference value; The step of determining the target pressure correction value according to the pressure state parameter and the temperature state parameter comprises: The target pressure correction value is determined according to the pressure change value and the temperature state parameter.

5. The method for detecting leakage of a liquid circulation system according to claim 4, characterized in that: The temperature state parameter includes a first temperature at the start time of the target time period and a second temperature at the end time of the target time period, and the step of determining the target pressure correction value according to the pressure change value and the temperature state parameter includes: determining a first pressure correction value according to the pressure change value; determining a second pressure correction value according to the first temperature and the second temperature; The target pressure correction value is determined according to the first pressure correction value and the second pressure correction value.

6. The method for detecting leakage of a liquid circulation system according to claim 5, characterized in that: The step of determining the second pressure correction value according to the first temperature and the second temperature comprises: determining a volume change value of the liquid circulated by the liquid circulation system within the target time period according to the first temperature and the second temperature; The second pressure correction value is determined according to the volume change value.

7. The method for detecting leakage of a liquid circulation system according to claim 6, characterized in that: The liquid circulation system further includes an expansion tank, and before the step of determining the second pressure correction value according to the volume change value, the step further includes: Obtaining the volume of the expansion tank and the gas pre-charge pressure of the expansion tank; Establishing a target corresponding relationship between the volume change value and the second pressure correction value according to the volume and the gas pre-charge pressure; The step of determining the second pressure correction value according to the volume change value comprises: Based on the target corresponding relationship, the second pressure correction value corresponding to the volume change value is determined.

8. The method for detecting leakage of a liquid circulation system according to claim 6, characterized in that: The step of determining the volume change value of the liquid circulated by the liquid circulation system within the target time period according to the first temperature and the second temperature comprises: Determine a first density of the circulating liquid in the liquid circulation system at the starting time according to the first temperature, and determine a second density of the circulating liquid in the liquid circulation system at the ending time according to the second temperature; determining a density difference between the first density and the second density; The volume change value is determined according to the density difference and the mass of the liquid filled in the liquid circulation system.

9. The method for detecting liquid leakage in a liquid circulation system according to any one of claims 4 to 8, characterized in that: The liquid circulation system includes a terminal device, a circulation pump and a control valve, wherein the control valve is used to control the fluid flow in the terminal device, and the step of obtaining the pressure change value includes: Determine the devices that undergo switching actions in the circulation pump and the control valve within the target time period as target loads, obtain the change value of the fluid pressure detected by the liquid circulation system before and after the switching action of the target load, and determine the pressure change value based on the change value of the fluid pressure.

10. The method for detecting liquid leakage in a liquid circulation system according to claim 9, characterized in that: The liquid circulation system comprises at least two terminal devices and at least two control valves, wherein the terminal devices and the control valves are arranged in a one-to-one correspondence, and the step of determining the pressure change value according to the change value comprises: Obtaining a proportional change value of a target ratio before and after the target load is switched, wherein the target ratio is a ratio of the number of the control valves that are opened to the number of the control valves that are closed; The change value of the fluid pressure is corrected according to the proportional change value to obtain the pressure change value.

11. A liquid leakage detection device, characterized in that: The liquid leakage detection device includes: a memory, a processor, and a liquid leakage detection program for a liquid circulation system stored in the memory and executable on the processor. When the liquid leakage detection program for the liquid circulation system is executed by the processor, the steps of the liquid leakage detection method for a liquid circulation system as described in any one of claims 1 to 10 are implemented.

12. A storage medium, characterized in that: The storage medium stores a liquid leakage detection program for a liquid circulation system, and when the liquid leakage detection program for a liquid circulation system is executed by a processor, the steps of the liquid leakage detection method for a liquid circulation system according to any one of claims 1 to 10 are implemented.

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