Air conditioning system control methods

Abstract

This invention belongs to the field of air conditioning technology, specifically providing a control method for an air conditioning system, aiming to solve the problem that existing air conditioning systems cannot promptly monitor refrigerant system water ingress. To this end, the control method of this invention can determine whether the flow rate of underfloor heating water flowing through the heat exchanger is lower than a preset value. If the flow rate is lower than the preset value, it determines whether the cause is refrigerant system water ingress. If the cause is determined to be refrigerant system water ingress, a refrigerant system water ingress warning is issued. By promptly identifying the cause when the water flow rate is lower than the preset value and issuing a warning when the cause is refrigerant system water ingress, this invention can effectively prevent damage to components such as the expansion valve and compressor liquid slugging caused by refrigerant system water ingress, thereby improving the safety and stability of the air conditioning system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air conditioners, and specifically provides a control method of an air conditioning system. BACKGROUND

[0002] At present, when the air conditioning system of the air conditioner is defrosted through the defrosting mode of the condenser in the outdoor unit, the fluorine passing through the condenser will absorb the cold energy during the melting of the frost, so that the temperature of the fluorine will be reduced to below zero. The fluorine below zero will exchange heat with the water in the plate heat exchanger when flowing through the plate heat exchanger, and the temperature of the fluorine will be raised by the water. However, due to the long-time operation of the air conditioning system, the water path of the air conditioning system may have low flow due to impurities accumulation, thereby causing the water in the heat exchanger to have low flow. In the process of heat exchange between the fluorine below zero and the low-flow water in the plate heat exchanger, the low-flow water in the plate heat exchanger may freeze, and even the plate heat exchanger may be frozen and cracked, thereby causing the water to enter the refrigerant system, which will greatly reduce the heat exchange capacity of the indoor and outdoor units, damage the parts such as the expansion valve, and even cause the problem of liquid strike of the compressor.

[0003] However, the existing related technology cannot timely find that the refrigerant system is waterlogged, and can only analyze whether the refrigerant system is waterlogged when the heat exchange capacity of the air conditioning system is severely affected, the parts are damaged, or even liquid strike occurs. At this time, the air conditioning system has been seriously affected, and needs to be repaired or even replaced parts before it can be used normally, which is poor user experience.

[0004] Correspondingly, there is a need in the field for a new technical solution to solve the above problems. SUMMARY

[0005] In order to solve the above problems in the prior art, that is, to solve the technical problems that the water entering the refrigerant system cannot be detected and the situation causing the water entering the refrigerant system cannot be warned in the prior art, the present application provides a control method of an air conditioning system, the air conditioning system comprising a compressor, a condenser, a four-way valve, a heat exchanger, and a floor heating assembly, refrigerant can circulate between the compressor, the condenser and the heat exchanger, and the floor heating water of the floor heating assembly can exchange heat with the refrigerant flowing through the heat exchanger at the heat exchanger. The control method of the air conditioning system comprises: judging whether the flow of the floor heating water flowing through the heat exchanger is lower than a preset value, if the flow is lower than the preset value, judging whether the reason for the flow being lower than the preset value is that the refrigerant system is waterlogged, and issuing a reminder that the refrigerant system is waterlogged when it is determined that the reason is that the refrigerant system is waterlogged.

[0006] In the technical scheme, the flow of the floor heating water in the heat exchanger is monitored to determine whether the flow is lower than a preset value, and when the flow is lower than the preset value, it is determined whether the cause of the flow being lower than the preset value is water in the refrigerant system, and when it is determined that the cause of the flow being lower than the preset value is water in the refrigerant system, a reminder of water in the refrigerant system is given, so that the user can be reminded in time when water is in the refrigerant system, and the user can turn off the air conditioning system in time and contact the after-sales personnel to take corresponding measures, so that the expansion valve and other parts of the air conditioning system are prevented from being damaged and the compressor is prevented from being subjected to liquid impact, and the safety and stability of the air conditioning system are improved.

[0007] In the preferred technical scheme of the control method of the air conditioning system, the step of determining whether the cause of the flow being lower than the preset value is water in the refrigerant system further includes: obtaining an operating parameter of the air conditioning system, and determining whether the cause is water in the refrigerant system based on the operating parameter of the air conditioning system.

[0008] In the technical scheme, whether the cause of the flow being lower than the preset value is water in the refrigerant system can be determined based on the operating parameter of the air conditioning system, and the detection process only needs to detect the operating parameter of the air conditioning system to determine whether the cause of the flow being lower than the preset value is water in the refrigerant system, without the need to configure an additional detection device to detect the air conditioning system, so that the detection is more convenient, and the user experience is improved.

[0009] In the preferred technical scheme of the control method of the air conditioning system, the operating parameter of the air conditioning system includes suction pressure and discharge pressure of the compressor, and the step of determining whether the cause is water in the refrigerant system based on the operating parameter of the air conditioning system further includes: determining the change trend of the suction pressure and the discharge pressure of the compressor, and if the suction pressure and the discharge pressure are both in a decreasing trend, it is determined that the cause is water in the refrigerant system.

[0010] In the technical scheme, when the heat exchanger is cracked, water will leak into the refrigerant system. After the water leaks into the refrigerant system, the content of the refrigerant in the refrigerant system will decrease, causing the suction pressure and the discharge pressure of the compressor to gradually decrease. Based on this, the change of the suction pressure and the discharge pressure of the compressor is detected to determine whether the cause of the flow being lower than the preset value is water in the refrigerant system, without having to wait until the heat exchange capacity of the air conditioning system is severely affected or the parts are damaged or even liquid impact occurs to determine that water is in the refrigerant system. That is, the change trend of the suction pressure and the discharge pressure of the compressor is determined to determine whether water is in the refrigerant system in time, so that further damage to the air conditioning system caused by water in the refrigerant system can be avoided.

[0011] In the preferred technical scheme of the control method of the air conditioning system, the operation parameter of the air conditioning system is a defrosting cycle of the last time the air conditioning system runs in the defrosting mode, and the step of judging whether the cause is the water entering the refrigerant system based on the operation parameter of the air conditioning system further comprises: judging whether the defrosting cycle of the last time the air conditioning system runs in the defrosting mode is less than a preset defrosting cycle, and if the defrosting cycle is less than the preset defrosting cycle, it is determined that the cause is the water entering the refrigerant system.

[0012] In the case of adopting the technical scheme, the defrosting cycle of the last time the air conditioning system runs in the defrosting mode is compared with the preset defrosting cycle, and whether the water enters the refrigerant system is judged according to the comparison result. Because if the water enters the refrigerant system of the air conditioning system, it will lead to the faster frosting speed on the surface of the condenser, which leads to the increase of the defrosting frequency of the air conditioning system and the decrease of the defrosting cycle, so when the defrosting cycle of the air conditioning system is detected to be less than the preset defrosting cycle, it indicates that the water enters the refrigerant system of the air conditioning system. Based on this, the present application can accurately judge whether the cause of the low flow is the water entering the refrigerant system by detecting the size of the defrosting cycle of the last time the air conditioning system runs in the defrosting mode, without waiting until the heat exchange capacity of the air conditioning system is seriously affected or the parts are damaged or even liquid strike occurs to judge whether the water enters the refrigerant system. That is, the present application can timely judge whether the water enters the refrigerant system by judging the size of the defrosting cycle of the last time the air conditioning system runs in the defrosting mode, so as to avoid the further damage of the air conditioning system caused by the water entering the refrigerant system.

[0013] In the preferred technical scheme of the control method of the air conditioning system, the air conditioning system further comprises a water pump, the water pump is used to make the floor heating water circulate between the floor heating assembly and the heat exchanger, and the operation parameter of the air conditioning system further comprises an operation parameter of the water pump. The step of judging whether the cause is the water entering the refrigerant system based on the operation parameter of the air conditioning system further comprises: determining the operation state of the water pump based on the operation parameter of the water pump, and judging whether the cause is the water entering the refrigerant system based on the operation state.

[0014] In the preferred technical scheme of the control method of the air conditioning system, the step of judging whether the cause is the water entering the refrigerant system based on the operation state further comprises: if the water pump is in an abnormal operation state, it is determined that the cause is not the water entering the refrigerant system, and if the water pump is in a normal operation state, the water inlet pressure P1 and the water outlet pressure P2 of the heat exchanger in a preset time period are obtained, and whether the cause is the water entering the refrigerant system is further judged based on the change trend of the water inlet pressure P1 and the water outlet pressure P2.

[0015] In the case of the above technical solution, if it is detected that the water pump is in an abnormal operating state, it indicates that the reason for the flow being lower than the preset value is that the water pump is malfunctioning, rather than that water has entered the refrigerant system. If the water pump is in a normal operating state, the refrigerant system is further determined to be waterlogged according to the change trend of the water inlet pressure P1 and the water outlet pressure P2 of the heat exchanger. In this way, the present application can determine whether the refrigerant system is waterlogged in a timely manner through the operating state of the water pump and the change trend of the water inlet pressure P1 and the water outlet pressure P2 of the heat exchanger, thereby avoiding further damage to the air conditioning system caused by waterlogging of the refrigerant system and improving the user experience.

[0016] In the preferred technical solution of the control method of the above air conditioning system, a reminder to overhaul the water pump is issued at the same time or after it is determined that the cause is not waterlogging of the refrigerant system.

[0017] In the preferred technical solution of the control method of the above air conditioning system, the water pump is a fixed-frequency water pump, and the floor heating assembly is provided with a water tank for supplementing floor heating water to the floor heating assembly. The step of determining whether the cause is waterlogging of the refrigerant system based on the change trend of the water inlet pressure P1 and the water outlet pressure P2 further includes: if both the water inlet pressure P1 and the water outlet pressure P2 show a decreasing trend or both show an increasing trend, it is determined that the cause is not waterlogging of the refrigerant system, and it is determined that the cause is clogging of the floor heating assembly; if the water inlet pressure P1 shows an increasing trend and the water outlet pressure P2 shows a decreasing trend, it is determined that the cause is not waterlogging of the refrigerant system, and it is determined that the cause is clogging of the heat exchanger; and if the water inlet pressure P1 is unchanged and the water outlet pressure P2 shows a decreasing trend, it is determined that the cause is waterlogging of the refrigerant system.

[0018] In the case of the above technical solution, by arranging a fixed-frequency water pump between the heat exchanger and the floor heating assembly, and further arranging a water tank for supplementing floor heating water to the floor heating assembly in the floor heating assembly, and arranging the water tank upstream of the fixed-frequency water pump, the water tank supplements floor heating water to the floor heating assembly, so that the water level in the floor heating assembly remains unchanged within a preset time period starting from the cracking of the heat exchanger. Therefore, based on the fixed-speed feature of the fixed-frequency water pump, the present application can ensure that the water pressure at the water inlet of the fixed-frequency water pump remains unchanged even if the heat exchanger cracks. In this way, the present application can determine whether the cause of the flow being lower than the preset value is clogging of the floor heating assembly, clogging of the heat exchanger, or waterlogging of the refrigerant system by detecting the water inlet pressure P1 and the water outlet pressure P2 of the heat exchanger, thereby enabling accurate determination of the cause of the flow being lower than the preset value, and enabling rapid overhaul of the air conditioning system according to the determination result, thereby improving the user experience.

[0019] In the preferred technical scheme of the control method of the air conditioning system, the control method further comprises: issuing a warning of the blockage of the floor heating assembly when or after determining that the floor heating assembly is blocked, and issuing a warning of the maintenance of the heat exchanger when or after determining that the heat exchanger is blocked.

[0020] In the preferred technical scheme of the control method of the air conditioning system, the four-way valve has four interfaces of e, d, c and s, the compressor has a first interface and a second interface, the condenser has a third interface and a fourth interface, the heat exchanger has a fifth interface, a sixth interface, a seventh interface and an eighth interface, the first interface is connected with the d interface, the third interface is connected with the eighth interface, the fourth interface is connected with the c interface, the seventh interface is connected with the e interface, the second interface is connected with the s interface, a water outlet of the floor heating assembly is connected with the fifth interface, and a water inlet of the floor heating assembly is connected with the sixth interface, and the step of determining whether the flow rate of the floor heating water flowing through the heat exchanger is lower than a preset value further comprises: obtaining an inlet water temperature Tw1 of the floor heating water entering the heat exchanger through the fifth interface, obtaining an outlet water temperature Tw2 of the floor heating water flowing out of the heat exchanger through the sixth interface, obtaining a condensing temperature Pdt of the refrigerant on the downstream side of the compressor, and determining that the flow rate is lower than the preset value if Tw2-Tw1≥△T1, Pdt-Tw2≤△T2, and the duration of this state is greater than or equal to a first preset time t1, wherein △T1 is a first threshold value, △T2 is a first threshold value, and / or obtaining the inlet water temperature Tw1 of the floor heating water entering the heat exchanger through the fifth interface, the outlet water temperature Tw2 of the floor heating water flowing out of the heat exchanger through the sixth interface, obtaining the ambient temperature T 环 , obtaining a refrigerant temperature Tf1 at the eighth interface, and obtaining a refrigerant temperature Tf2 at the seventh interface, and determining that the flow rate is lower than the preset value if Tw2-Tw1≤△T3, |Tw1-T 环 |≤△T4, |Tw2-T 环 |≤△T5, and Tf1-Tf2≤△T6, and the duration of this state is greater than or equal to a second preset time t2, wherein △T3 is a third threshold value, △T4 is a fourth threshold value, △T5 is a fifth threshold value, and △T6 is a sixth threshold value.

[0021] In the case of adopting the above technical scheme, the inlet water temperature Tw1 and the outlet water temperature Tw2 of the heat exchanger and the condensing temperature of the compressor are detected, and / or the inlet water temperature Tw1, the outlet water temperature Tw2 and the ambient temperature T 环, the refrigerant temperature Tf1 and the refrigerant temperature Tf2 to determine whether the flow rate of the water flowing through the heat exchanger is less than the preset value. The above detection scheme only needs to detect the operating parameters of the air conditioning system to determine whether the flow rate of the water flowing through the heat exchanger is greater than or less than the preset value, without separately configuring a flow rate detection device, and the flow rate of the water flowing through the heat exchanger can be monitored by detecting the operating parameters of the air conditioning system, thereby saving the number of parts of the air conditioning system and reducing the measurement process. BRIEF DESCRIPTION OF DRAWINGS

[0022] The control method of the air conditioning system of the present application will be described below with reference to the air conditioning system of the present application and the accompanying drawings. In the drawings:

[0023] Figure 1 is a structural schematic diagram of the air conditioning system of the present application in one embodiment;

[0024] Figure 2 is a detailed structural diagram of the outdoor side of the air conditioning system of the present application in one embodiment;

[0025] Figure 3 is a general flowchart of the control method of the air conditioning system of the present application in one embodiment;

[0026] Figure 4 is a control flowchart for determining whether the flow rate of the water flowing through the heat exchanger is less than the preset value based on the inlet water temperature Tw1, the outlet water temperature Tw2 of the water flowing through the heat exchanger and the condensing temperature Pdt of the refrigerant downstream of the compressor when the air conditioning system of the present application in one embodiment is operated in the heating mode;

[0027] Figure 5 is a control flowchart for determining whether the flow rate of the water flowing through the heat exchanger is less than the preset value based on the inlet water temperature Tw1, the outlet water temperature Tw2 of the water flowing through the heat exchanger, the ambient temperature T 环 , the refrigerant temperature Tf1 and the refrigerant temperature Tf2 when the air conditioning system of the present application in one embodiment is operated in the heating mode;

[0028] Figure 6 is a control flowchart for determining whether the reason is the water inlet of the fluorine system based on the operating parameters of the air conditioning system of the present application in one embodiment;

[0029] Figure 7 is a control flowchart for determining whether the reason is the water inlet of the fluorine system based on the suction pressure Ps and the discharge pressure Pd of the compressor of the air conditioning system of the present application in one embodiment;

[0030] Figure 8 is a control flowchart for determining whether the reason is the water inlet of the fluorine system based on the defrosting cycle when the air conditioning system of the present application in one embodiment is operated in the defrosting mode last time.

[0031] Figure 9 Figure 1 is a control flow chart of a fluorine system water-inlet judging method based on water pump running parameters in a fluorine system of the present application;

[0032] Figure 10 Figure 2 is a control flow chart of a fluorine system water-inlet judging method based on water pump running parameters, heat exchanger water-inlet pressure P1 and heat exchanger water-outlet pressure P2 in a fluorine system of the present application.

[0033] List of reference signs:

[0034] 1, air conditioning system; 11, outdoor unit; 111, compressor; 1111, first interface; 1112, second interface; 1113, suction pressure sensor; 1114, discharge pressure sensor; 1115, throttling device; 112, plate heat exchanger; 1121, fifth interface; 1122, sixth interface; 1123, seventh interface; 1124, eighth interface; 1125, water-inlet temperature sensor; 1126, water-inlet pressure sensor; 1127, water-outlet temperature sensor; 1128, water-outlet pressure sensor; 1129, first fluorine-inlet temperature sensor; 11210, fluorine-outlet temperature sensor; 113, condenser; 1131, third interface; 1132, fourth interface; 1133, defrosting period sensor; 1134, outdoor temperature sensor; 114, four-way reversing valve; 12, floor heating assembly; 121, floor heating pipeline; 122, water pump; 123, water tank; 13, indoor unit; 131, indoor heat exchanger. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application. Those skilled in the art can make adjustments to them as needed in order to adapt to specific application occasions.

[0036] It should be noted that in the description of the present application, the terms indicating the direction or positional relationship of "inner", "outer" and the like are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" to "eighth" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0037] In addition, it needs to be explained that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] The prior art has the problem that the refrigerant system water ingress cannot be monitored in time. Therefore, the air conditioning system of the present application determines whether the cause of the flow of the floor heating water flowing through the heat exchanger being lower than the preset value is refrigerant system water ingress when the flow is lower than the preset value, and issues a reminder of refrigerant system water ingress when it is determined that the cause is refrigerant system water ingress, so that the user can be reminded in time when the refrigerant system water ingress, and the user can take appropriate measures to avoid damage to the expansion valve and other components of the air conditioning system, and problems such as compressor liquid knock, so that the safety and stability of the air conditioning system can be effectively improved.

[0039] First refer to Figure 1 and Figure 2, the air conditioning system 1 comprises an indoor unit 13, an outdoor unit 11 and a floor heating assembly 12, the outdoor unit 11 mainly comprises a compressor 111, an outdoor fan (not shown), a condenser 113 and a plate heat exchanger 112, the indoor unit 13 mainly comprises an indoor heat exchanger 131, the floor heating assembly 12 comprises a floor heating pipeline 121 and a water pump 122. The compressor 111 has a first interface 1111 and a second interface 1112, the condenser 113 has a third interface 1131 and a fourth interface 1132, the plate heat exchanger 112 has a fifth interface 1121, a sixth interface 1122, a seventh interface 1123 and an eighth interface 1124, in the actual application process of the present application, a four-way reversing valve 114 is arranged in the freon circulation loop, the four-way reversing valve 114 has an e interface, a c interface, a d interface and an s interface, so that the air conditioning system 1 can switch between heating mode and defrosting mode in winter. Among them, the first interface 1111 is connected with the d interface, the third interface 1131 is connected with the eighth interface 1124, the fourth interface 1132 is connected with the c interface, the seventh interface 1123 is connected with the e interface, and the second interface 1112 is connected with the s interface, so that the freon circulates between the compressor 111, the condenser 113 and the plate heat exchanger 112. The water outlet of the floor heating assembly 12 is connected with the fifth interface 1121, and the water inlet of the floor heating assembly 12 is connected with the sixth interface 1122, so as to form a water circulation loop between the floor heating assembly 12 and the plate heat exchanger 112. Specifically, when the air conditioning system 1 is in heating mode, the high-temperature and high-pressure gaseous freon from the compressor 111 enters the four-way reversing valve 114 through the d interface, is discharged through the e interface and enters the plate heat exchanger 112 through the seventh interface 1123, the freon flowing through the plate heat exchanger 112 releases heat at the plate heat exchanger 112 and exchanges heat with the floor heating water flowing through the plate heat exchanger 112, thereby heating the floor heating water in the water circulation loop. When the liquid freon enters the condenser 113, the freon is subjected to the action of a throttling device 1115, so that the pressure of the freon in the condenser 113 is suddenly reduced, so that the liquid freon becomes gaseous freon, wherein the throttling device 1115 can be a capillary tube or an expansion valve or other components with throttling pressure regulating function. Then the freon absorbs heat from the external environment through the condenser 113, so as to provide heating for the floor heating assembly 12, and thereafter, the freon flowing out of the condenser 113 enters the four-way reversing valve 114 through the c port, and then flows back to the compressor 111 through the s port.In the defrosting mode, the freon discharged from the compressor 111 enters the four-way reversing valve 114 through the d port, and then flows out from the c port and enters the condenser 113. The high-temperature gaseous freon flowing through the condenser 113 is cooled to become liquid freon and releases heat, so that the frost represented by the condenser 113 can be melted. After the freon passes through the condenser 113, it absorbs cold and becomes low-temperature liquid freon, and then flows into the plate heat exchanger 112 through the pressure regulating device 1115, so that the freon absorbs heat from the plate heat exchanger 112, thereby providing heating for defrosting. Finally, the freon discharged from the plate heat exchanger 112 enters the four-way reversing valve 114 through the e port, and then flows out from the s port and flows back to the compressor 111.

[0040] It should be noted that when the air conditioning system 1 of the present application is running in the heating mode, the air conditioning system 1 can also heat the indoor space by the indoor unit 13 through the indoor heat exchanger 131, or can heat the indoor space by the indoor unit 13 and the floor heating assembly 12 at the same time. When the air conditioning system 1 of the present application is running in the defrosting mode, the indoor unit 13 does not work.

[0041] In addition, although the heat exchanger described above for exchanging heat with the floor heating water is the plate heat exchanger 112, this is not limiting, and those skilled in the art can also set the heat exchanger to be a double-pipe heat exchanger or other types of heat exchangers according to needs. Without deviating from the basic principles of the present application, those skilled in the art can flexibly select the setting form of the heat exchanger according to specific application scenarios, as long as the heat exchanger can achieve heat exchange between the floor heating water and the refrigerant.

[0042] Furthermore, although the air conditioning system 1 described above uses freon as the refrigerant for heat exchange with water, this is not limiting, and those skilled in the art can also use propane or other substances with similar physical properties as the refrigerant of the air conditioning system 1 according to needs.

[0043] Furthermore, although the plate heat exchanger 112 described above is installed on the outdoor side, this is not limiting, and those skilled in the art can obviously install the plate heat exchanger 112 on the indoor side according to needs, as long as the plate heat exchanger 112 can achieve heat exchange between the floor heating water and the refrigerant.

[0044] Continuing to refer to Figure 1 and Figure 2, the air conditioning system 1 is provided with an indoor temperature sensor (not shown), an outdoor temperature sensor 1134, an inlet water temperature sensor 1125, an outlet water temperature sensor 1127, a first inlet fluorine temperature sensor 1129, an outlet fluorine temperature sensor 11210, an inlet water pressure sensor, an outlet water pressure sensor 1128, a suction pressure sensor 1113 and a discharge pressure sensor 1114, and a defrosting cycle sensor 1133. The outdoor temperature sensor 1134 can detect the outdoor ambient temperature on the outdoor side, the indoor temperature sensor (not shown) can detect the indoor temperature, the inlet water temperature sensor 1125 can detect the inlet water temperature Tw1 of the floor heating water of the plate heat exchanger 112, the outlet water temperature sensor 1127 can detect the outlet water temperature Tw2 of the floor heating water of the plate heat exchanger 112, the first inlet fluorine temperature sensor 1129 can detect the inlet fluorine temperature Tf1 of the plate heat exchanger 112, the outlet fluorine temperature sensor 11210 can detect the outlet fluorine temperature Tf2 of the plate heat exchanger 112, the inlet water pressure sensor 1126 can detect the inlet water pressure P1 of the floor heating water of the plate heat exchanger 112, the outlet water pressure sensor 1128 can detect the outlet water pressure P2 of the floor heating water of the plate heat exchanger 112, the suction pressure sensor 1113 can detect the suction pressure Ps of the suction port of the compressor 111, the discharge pressure sensor 1114 can detect the discharge pressure Pd of the discharge port of the compressor 111, and the defrosting cycle sensor 1133 can obtain the defrosting cycle of the air conditioning system 1.

[0045] It should be noted that although the above-described air conditioning system 1 is provided with an outdoor temperature sensor 1134 and an indoor temperature sensor, the outdoor temperature sensor 1134 can detect the outdoor ambient temperature, and the indoor temperature sensor can detect the indoor temperature, but this is not limiting, obviously, the air conditioning system 1 can also not be provided with the outdoor temperature sensor 1134 and / or the indoor temperature sensor, for example, a positioning module can be provided on the air conditioning system 1 to obtain the location of the air conditioning system 1, and the air conditioning system 1 is connected with the Internet platform through WiFi, Bluetooth, ZigBee, NFC, LiFi and other communication modes, when the outdoor temperature needs to be obtained, the outdoor temperature of the location of the air conditioning system 1 can be obtained through the Internet platform. The indoor temperature can be determined by a thermometer arranged in the indoor space, the thermometer is in communication connection with the air conditioning system 1, the thermometer can upload the detected indoor temperature to the air conditioning system 1, or the user can upload the outdoor temperature or the indoor temperature to the air conditioning system 1 through a remote controller, a mobile terminal such as an APP connected with the air conditioning system 1, or a PC connected with the air conditioning system 1, without departing from the basic principles of the present application, the person skilled in the art can flexibly select the specific way of obtaining the outdoor temperature or the indoor temperature according to the specific application scene, as long as the outdoor temperature and the indoor temperature can be obtained.

[0046] In the present application, the air conditioning system 1 is further provided with a monitoring device (not shown) connected with the water pump 122, through which the water pump 122 can drive the heating water to flow in the water circulation loop, and through the monitoring device, the operating parameters of the water pump 122 can be obtained so as to determine the operating state of the water pump 122 according to the obtained operating parameters of the water pump 122. Specifically, the monitoring device can be a power sensor or a current sensor, through which the power and current of the water pump 122 are monitored to determine the operating state of the water pump 122. For example, when the water pump 122 is stuck, the power or current of the water pump 122 will suddenly become larger and exceed the safety threshold, so when the current or power suddenly becomes larger and exceeds the safety threshold, it is determined that the water pump 122 is stuck. When the water pump 122 fails due to internal circuit failure, the power or current of the water pump 122 will suddenly become zero, so when the current or power suddenly becomes zero, the water pump 122 stops running due to internal circuit damage.

[0047] It should be noted that when the water pump 122 is a variable frequency water pump, the operating state of the variable frequency water pump can also be monitored by monitoring the PWM signal of the variable frequency water pump, and when the water pump 122 is a fixed frequency water pump, the operating state of the fixed frequency water pump and the blockage of the circulating water circuit can also be determined by monitoring the change of the pressure values at the water inlet and outlet of the fixed frequency water pump.

[0048] In the present application, the air conditioning system 1 further comprises a control module (not shown), which can determine whether the flow of heating water flowing through the heat exchanger is lower than a preset value, and if the flow is lower than the preset value, determine whether the reason for the flow being lower than the preset value is fluorine system (freon system) water inlet. When it is determined that the reason is fluorine system water inlet, a reminder of fluorine system water inlet is issued.

[0049] It should be noted that the control module can be a control chip possessed by the air conditioning system 1 itself, or a controller specially used for executing the control method of the present application, or also a functional module or functional unit of the controller.

[0050] In the following, the possible implementation modes of the control method of the air conditioning system of the present application are described with reference to Figures 3 to 10 .

[0051] As shown in Figure 3 , in one possible implementation mode, the control method of the present application comprises:

[0052] S100: determining whether the flow of heating water flowing through the plate heat exchanger is lower than a preset value;

[0053] S101: if the flow is lower than the preset value, determining whether the reason for the flow being lower than the preset value is fluorine system water inlet;

[0054] S102: when it is determined that the reason is fluorine system water ingress, a reminder of fluorine system water ingress is issued.

[0055] In S100, the preset value is a flow value at which the floor heating water in the plate heat exchanger will not freeze due to cooling by low-temperature freon when the air conditioning system is in the defrosting mode. The size of the preset value can be adjusted according to actual conditions, for example, the size of the preset value can be determined according to the outdoor ambient temperature, the power of the compressor when in the defrosting mode, the freon inlet temperature Tfi of the plate heat exchanger, and other parameters. It should be noted that the specific process of determining whether the flow of the floor heating water flowing through the plate heat exchanger is lower than the preset value is described below, and is not repeated here to avoid redundancy.

[0056] In S101, if the flow of the floor heating water flowing through the plate heat exchanger is lower than the preset value, it indicates that the plate heat exchanger of the air conditioning system has a risk of freeze cracking, and the air conditioning system needs to be repaired. The cause of the flow being lower than the preset value is determined to be whether the fluorine system is waterlogged, so that the fluorine system water ingress can be determined in time, and further damage to the air conditioning system caused by the refrigerant system water ingress can be reduced.

[0057] If the flow of the floor heating water flowing through the plate heat exchanger is higher than the preset value, it indicates that the flow of the floor heating water in the plate heat exchanger is in a normal state, and the risk of freeze cracking of the plate heat exchanger of the air conditioning system is low. At present, the air conditioning system does not need to be repaired, and the current operation mode of the air conditioning system is controlled to run normally.

[0058] In the implementation of the present application, the flow of the floor heating water in the plate heat exchanger of the air conditioning system is usually determined when the air conditioning system is running in the heating mode. In the present application, when the air conditioning system is running in the heating mode, the high-temperature and high-pressure gaseous refrigerant from the compressor enters the plate heat exchanger, exchanges heat with the floor heating water flowing through the plate heat exchanger, and heats the floor heating water. When the flow of the floor heating water in the plate heat exchanger is lower than the preset value, the air conditioning system can be repaired in time, thereby avoiding the problem of damage or further damage to the air conditioning system caused by the low flow of the floor heating water in the plate heat exchanger.

[0059] In S102, when it is determined that the reason for the flow of the floor heating water in the plate heat exchanger being lower than the preset value is fluorine system water ingress, a reminder of fluorine system water ingress can be issued in time, so that the maintenance personnel can quickly repair the plate heat exchanger, and the risk of damage to the air conditioning system caused by fluorine system water ingress can be further reduced.

[0060] It should be noted that the alert for water ingress into the refrigerant system can be issued through the display panel of the air conditioning system, through the voice alarm device installed in the air conditioning system, or simultaneously through both the display panel and the voice alarm device installed in the air conditioning system. Obviously, it can also be issued to the user's mobile terminal via communication methods such as WiFi, Bluetooth, ZigBee, NFC, and LiFi.

[0061] like Figure 4 As shown, in one possible implementation, S100 specifically includes:

[0062] S200: Obtain the inlet temperature Tw1 of the underfloor heating water entering the plate heat exchanger via the fifth interface;

[0063] S201: Obtain the outlet temperature Tw2 of the floor heating water flowing out of the plate heat exchanger via the sixth interface;

[0064] S202: Obtain the condensation temperature Pdt of the refrigerant flowing through the plate heat exchanger;

[0065] S203: Calculate the difference between the outlet water temperature Tw2 and the inlet water temperature Tw1, Tw2-Tw1, and the difference between the condensation temperature Pdt and the outlet water temperature Tw2, Pdt-Tw2.

[0066] S204: Determine whether Tw2-Tw1 is greater than or equal to △T1, and |Tw1-T 环 If |≤△T4、Pdt-Tw2 is less than or equal to △T2, then execute S205; otherwise, execute S208.

[0067] S205: Obtain the first duration t1 of this state;

[0068] S206: Determine whether the first duration t1 is greater than or equal to the first preset time. If yes, execute S207; otherwise, execute S208.

[0069] S207: The flow rate is determined to be lower than the preset value;

[0070] S208: Ensure that the flow rate is not lower than the preset value.

[0071] In S200, the inlet water temperature Tw1 of the plate heat exchanger is obtained based on the aforementioned inlet water temperature sensor.

[0072] In S201, the outlet water temperature Tw2 of the plate heat exchanger is obtained based on the aforementioned outlet water temperature sensor.

[0073] In S202, the condensing temperature Pdt is determined based on the discharge pressure Pd of the compressor obtained by the discharge pressure sensor. For example, a condensing temperature database can be constructed in advance, in which discharge pressures and corresponding condensing temperatures are stored. The obtained discharge pressure Pd is compared with the discharge pressures in the condensing temperature database, and the condensing temperature corresponding to the matched discharge pressure is determined as the condensing temperature Pdt.

[0074] In S203, the difference Tw2-Tw1 between the outlet water temperature Tw2 and the inlet water temperature Tw1, and the difference Pdt-Tw2 between the condensing temperature Pdt and the outlet water temperature Tw2 are calculated based on the inlet water temperature Tw1 obtained in S200, the outlet water temperature Tw2 obtained in S201, and the condensing temperature Pdt obtained in S202.

[0075] In S204, it is determined whether Tw2-Tw1 is greater than or equal to △T1, and whether Pdt-Tw2 is less than or equal to △T2, where △T1 is a first threshold value, which is the temperature difference between the outlet water temperature Tw2 and the inlet water temperature Tw1 when the flow rate of the floor heating water in the plate heat exchanger is equal to a preset value. △T2 is a second threshold value, which is the temperature difference between the condensing temperature Pdt of the freon in the plate heat exchanger and the outlet water temperature Tw2 of the plate heat exchanger when the flow rate of the floor heating water in the plate heat exchanger is equal to the preset value.

[0076] Obviously, the size of the first threshold value can also be determined based on the operating parameters of the air conditioning system, such as the inlet water temperature Tw1 of the plate heat exchanger, the operating power of the compressor, the outdoor ambient temperature, the indoor ambient temperature, and the set temperature of the air conditioning system. In specific implementation, the control module can pre-store a mapping relationship between the first threshold value and the operating parameters of the air conditioning system 1, such as the inlet water temperature Tw1 of the plate heat exchanger, the operating power of the compressor, the outdoor ambient temperature, the indoor ambient temperature, and the set temperature of the air conditioning system, where the mapping relationship can be obtained according to historical training data. The size of the second threshold value is determined based on the operating parameters of the air conditioning system 1, such as the discharge pressure Pd of the compressor, the inlet water temperature Tw1 of the plate heat exchanger, the operating power of the compressor, the outdoor ambient temperature, and the indoor ambient temperature. In specific implementation, the control module can pre-store a mapping relationship between the second threshold value and the operating parameters of the air conditioning system 1, such as the discharge pressure Pd of the compressor, the inlet water temperature Tw1 of the plate heat exchanger, the operating power of the compressor, the outdoor ambient temperature T 环 , the indoor ambient temperature, where the mapping relationship can be obtained according to historical training data.

[0077] In S205, the first duration t1 is obtained, which is the duration of Tw2-Tw1≥△T1 and Pdt-Tw2≤△T2.

[0078] In S206, the first duration t1 in S205 is compared with the first preset time to realize real-time detection of the flow in the plate heat exchanger, so that it can be judged in real time whether the flow of the floor heating water in the plate heat exchanger is higher than the preset value. Moreover, the above detection process only needs to obtain the inlet and outlet water temperatures Tw1, Tw2 of the plate heat exchanger and the discharge pressure Pd of the compressor when the air conditioning system is in the heating mode, without the need to install a flow meter for detecting the flow in the plate heat exchanger, which can reduce the risk of blockage of the plate heat exchanger caused by the accumulation of impurities at the flow meter, and ensure the stability of the operation of the air conditioning system.

[0079] It should be noted that the first preset time can be determined according to specific requirements, as long as the flow in the plate heat exchanger can be judged through the first preset time, and even if the air conditioning system has an abnormal condition, further damage will not occur within the first preset time, for example, the range of the first preset time is 30s-2min, and in the embodiment of the present application, the duration of the first preset time is 30s.

[0080] As shown in FIG. 1, in another possible embodiment, S100 specifically includes: Figure 4

[0081] S300: obtaining the inlet water temperature Tw1 of the floor heating water entering the plate heat exchanger via the fifth interface;

[0082] S301: obtaining the outlet water temperature Tw2 of the floor heating water flowing out of the plate heat exchanger via the sixth interface;

[0083] S302: obtaining the ambient temperature T 环 ;

[0084] S303: obtaining the refrigerant temperature Tf1 at the eighth interface;

[0085] S304: obtaining the refrigerant temperature Tf2 at the seventh interface;

[0086] S305: calculating the difference Tw2-Tw1 between the outlet water temperature Tw2 and the inlet water temperature Tw1, calculating the absolute value |Tw1-T 环 | of the difference between the inlet water temperature Tw1 and the ambient temperature T 环 , calculating the absolute value |Tw2-T 环 | of the difference between the outlet water temperature Tw2 and the ambient temperature T 环 , and calculating the difference Tf1-Tf2 between the refrigerant temperature Tf1 at the eighth interface and the refrigerant temperature Tf2 at the seventh interface;

[0087] S306: judging whether Tw2-Tw1 is less than or equal to △T3, |Tw1-T​环 |Tw2-Tw1 is less than or equal to △T3, and |Tw1-T 环 |Tw2-Tw1 is less than or equal to △T3, and |Tw1-T

[0088] S307: obtaining a second duration t2 in the state;

[0089] S308: determining whether the second duration t2 is greater than or equal to a second preset time, if yes, performing S309, if no, performing S310;

[0090] S309: determining that the flow is lower than a preset value;

[0091] S310: determining that the flow is not lower than the preset value.

[0092] In S300, the water inlet temperature Tw1 of the plate heat exchanger is obtained based on the water inlet temperature sensor.

[0093] In S301, the water outlet temperature Tw2 of the plate heat exchanger is obtained based on the water outlet temperature sensor.

[0094] In S302, the outdoor environment temperature T 环 is obtained based on the outdoor temperature sensor.

[0095] In S303, the fluorine inlet temperature Tf1 of the plate heat exchanger is obtained based on the fluorine inlet temperature sensor.

[0096] In S304, the fluorine outlet temperature Tf2 of the plate heat exchanger is obtained based on the fluorine outlet temperature sensor.

[0097] In S305, based on the water inlet temperature Tw1 obtained in S300, the water outlet temperature Tw2 obtained in S301, the outdoor environment temperature obtained in S302, the fluorine inlet temperature Tf1 obtained in S303, and the fluorine outlet temperature Tf2 obtained in S304, the difference Tw2-Tw1 between the water outlet temperature Tw2 and the water inlet temperature Tw1 is calculated, the absolute value |Tw1-T 环 | of the difference between the water inlet temperature Tw1 and the environment temperature T 环 | is calculated, the absolute value |Tw2-T 环 | of the difference between the water outlet temperature Tw2 and the environment temperature T 环 | is calculated, and the difference Tf1-Tf2 between the refrigerant temperature Tf1 at the eighth interface and the refrigerant temperature Tf2 at the seventh interface is calculated.

[0098] In S306, it is determined whether Tw2-Tw1 is less than or equal to △T3, and |Tw1-T 环 | is less than or equal to △T4, |Tw2-T环 |Tw1-Tw2|≤△T3, |Tw1-T

[0099] wherein, △T3 is a third threshold value, which is a temperature difference between the outlet water temperature Tw2 and the inlet water temperature Tw2 of the plate heat exchanger when the water in the plate heat exchanger is not flowing, almost dead water, since the water in the plate heat exchanger almost does not flow at this time, the outlet water temperature Tw2 of the plate heat exchanger and the inlet water temperature Tw1 and the ambient temperature T 环 are almost the same, that is, the value of △T3 is very small. In a possible implementation, the value of △T3 is set in the range of 0℃ to 2℃. Preferably, △T3 is 1℃.

[0100] Since the outlet water temperature Tw2 of the plate heat exchanger and the inlet water temperature Tw1 and the ambient temperature T 环 are almost the same when the water in the plate heat exchanger is almost dead water, the values of △T4 and △T5 of |Tw1-T 环 | and |Tw2-T 环 | are also very small. In a possible implementation, the value of △T4 is set in the range of 0℃ to 5℃, and the value of △T5 is set in the range of 0℃ to 5℃. Preferably, △T4 is 3℃ and △T5 is 3℃.

[0101] Since the temperature of the floor heating water in the plate heat exchanger almost does not change, at this time, the freon in the plate heat exchanger will also not exchange heat with the floor heating water, so the inlet freon temperature Tf1 and the outlet freon temperature Tf2 of the plate heat exchanger are also almost the same, but since the air conditioning system is still running, the freon will continue to flow in the plate heat exchanger, which will cause part of the heat of the freon to be transferred to the shell of the plate heat exchanger, thereby causing the outlet freon temperature Tf2 and the inlet freon temperature Tf1 of the plate heat exchanger to have a certain difference. In a possible implementation, the value of △T6 is set in the range of 0℃ to 5℃. Preferably, △T6 is 5℃.

[0102] In S307, a first duration t1 and a second duration t2 are obtained, which are durations of Tw2-Tw1≤△T3, |Tw1-T 环 |≤△T4, |Tw2-T 环 |≤△T5, and Tf1-Tf2≤△T6.

[0103] In S308, the second duration t2 in S307 above is compared with a second preset time to realize real-time detection of the flow in the plate heat exchanger, so that it can be judged in real time whether the flow of the floor heating water in the plate heat exchanger is higher than a preset value. Moreover, the above detection process only needs to obtain the inlet water temperature Tw1, the outlet water temperature Tw2, the ambient temperature T 环The plate heat exchanger only needs to be supplied with refrigerant at inlet temperature Tf1 and outlet temperature Tf2. There is no need to install a flow meter in the plate heat exchanger to detect the flow rate. This reduces the risk of impurities accumulating at the flow meter and causing blockage of the plate heat exchanger, thus ensuring the stability of the air conditioning system.

[0104] It should be noted that the second preset time can be determined according to specific needs, as long as the flow rate inside the plate heat exchanger can be judged through the second preset time, and no further damage will occur even if the air conditioning system malfunctions within the second preset time. For example, the range of the second preset time is 30s-2min. In the embodiment of the present invention, the duration of the second preset time is 30s.

[0105] In this application, if the flow rate is lower than the preset value, it is determined whether the cause of the lower flow rate is fluoride system inlet water, as shown below. Figures 6 to 10 This paper describes a possible implementation method for determining whether the cause of the flow rate being lower than the preset value is due to water entering the fluoride system.

[0106] like Figure 6 As shown, in one possible implementation, S101 further includes:

[0107] S400: Obtain operating parameters of the air conditioning system;

[0108] S401: Determine whether the cause is water ingress into the refrigerant system based on the operating parameters of the air conditioning system.

[0109] In S400, the operating parameters of the air conditioning system include those when the system is in heating mode. Alternatively, the operating parameters can also be those when the system is in defrost mode. It should be noted that these operating parameters are stored within the air conditioning system and can be directly accessed when needed.

[0110] In S401, it is possible to determine whether the cause is water ingress in the refrigerant system based on the operating parameters of the air conditioning system itself, without the need for an additional detection device to detect whether water has entered the refrigerant system. Furthermore, this invention can also determine the cause of water ingress in the refrigerant system, thereby improving the repair speed of the air conditioning system by after-sales personnel.

[0111] See below. Figure 7 When describing the operating parameters of the air conditioning system of the present invention as the compressor's suction pressure and discharge pressure, a possible implementation method is used to determine whether the cause is water ingress into the refrigerant system.

[0112] like Figure 7 As shown in one possible implementation, S401 further includes:

[0113] S500: judging the change trend of suction pressure and discharge pressure of the compressor;

[0114] S501: if the suction pressure and the discharge pressure are both in a decreasing trend, determining that the cause is water entering the fluorine system.

[0115] In S500, the suction pressure Ps and the discharge pressure Pd of the compressor are obtained based on the suction pressure sensor and the discharge pressure sensor, and the change trend of the suction pressure Ps and the discharge pressure Pd is judged according to the data of the suction pressure Ps and the discharge pressure Pd of the compressor within a preset time.

[0116] In S501, if the suction pressure Ps and the discharge pressure Pd are both in a decreasing trend, it indicates that the freon enters the floor heating water through the plate heat exchanger, i.e. the water enters the fluorine system.

[0117] It should be noted that when the refrigerant in the refrigerant circulation loop of the air conditioning system does not leak and is in the working process, the suction pressure of the compressor is approximately between 0.7 and 1.2 MPa, and the discharge pressure of the compressor is approximately between 2.0 and 2.8 MPa. Based on this, when the power of the compressor decreases in the working process of the air conditioning system, the operating speed of the compressor will decrease, thereby causing the flow rate of the gas in the compressor to decrease, the flow rate of the gas in the suction pipe to slow down, and thus the static pressure in the suction pipe to increase. Therefore, the suction pressure Ps of the compressor will increase accordingly. At the discharge port of the compressor, due to the decrease of the operating speed of the compressor, the compression ratio of the compressor decreases, and the discharge volume also decreases accordingly, thereby causing the discharge pressure Pd to decrease. Therefore, when the power of the compressor decreases, the suction pressure Ps of the compressor will increase, and the discharge pressure Pd will decrease. Conversely, if the power of the compressor increases, the suction pressure Ps of the compressor will decrease, and the discharge pressure Pd will increase. Therefore, based on the above analysis, if it is detected that the flow rate of the floor heating water is lower than the preset value, and the suction pressure and the discharge pressure of the compressor are both in a decreasing trend, it indicates that the freon enters the floor heating water through the plate heat exchanger, and the floor heating water enters the fluorine system through the plate heat exchanger.

[0118] The following will be described with reference to Figure 8 to explain a possible implementation of the air conditioning system of the present application, in which the historical operating parameter of the air conditioning system is the defrosting cycle when the air conditioning system last ran the defrosting mode, and whether the cause is the water entering the fluorine system is judged.

[0119] As Figure 8 In a possible implementation, S401 further comprises:

[0120] S600: judging whether the defrosting cycle is less than a preset defrosting cycle when the air conditioning system last ran the defrosting mode.

[0121] S601: If the defrosting cycle is less than the preset defrosting cycle, the cause is determined to be water ingress into the fluoride system.

[0122] In S600, the defrost cycle during the last defrost mode operation of the air conditioning system is obtained by the aforementioned defrost cycle sensor.

[0123] It should be noted that the defrost cycle sensor can be a second refrigerant inlet temperature sensor installed on the condenser. This second refrigerant inlet temperature sensor is connected to the control module. The control module can then record the temperature change of the refrigerant at the condenser inlet based on the temperature measured by the second refrigerant inlet temperature sensor. When the temperature at the condenser inlet is higher than a first preset temperature, it indicates that the air conditioning system is in defrost mode. When the temperature at the condenser inlet drops below the second preset temperature, it indicates that the air conditioning system switches from defrost mode to heating mode. The control module records the sum of the defrost mode and heating mode times, which constitutes the defrost cycle of the air conditioning system. The preset defrost cycle is the defrost cycle of the air conditioning system when no water enters the refrigerant system.

[0124] In S601, if the defrost cycle of the last time the air conditioning system operated in defrost mode is less than the preset defrost cycle, it indicates that water has entered the refrigerant system. This causes the water entering the refrigerant circulation loop to absorb heat as it evaporates, resulting in a lower condenser temperature and accelerating the frosting speed of the condenser. Consequently, the defrost cycle of the air conditioning system becomes shorter. Therefore, if the defrost cycle of the last time the air conditioning system operated in defrost mode is detected to be less than the preset defrost cycle, it is determined that water has entered the refrigerant system.

[0125] It should be noted that when the air conditioning system defrosts the outdoor unit's condenser, the control module controls the four-way reversing valve to allow high-temperature Freon gas to enter the condenser. As the high-temperature Freon gas flows through the condenser, it condenses into a liquid upon contact with the cold air, releasing a large amount of heat to melt the frost on the outside of the condenser. Meanwhile, the low-temperature liquid Freon flowing out of the condenser enters through the seventh port of the plate heat exchanger and absorbs heat from the underfloor heating water in the plate heat exchanger, causing the Freon to condense into a high-temperature gas. From the above defrosting process of the air conditioning system, it can be seen that during defrosting, the temperature of the Freon inlet of the condenser is that of high-temperature gaseous Freon, with a temperature range of approximately 50°C to 90°C. For example, in one possible implementation, the first preset temperature is 50°C. Thus, when the temperature at the Freon inlet of the condenser is detected to be higher than the first preset temperature, the air conditioning system can be considered to have started operating the defrosting mode. When the air conditioning system heats the room, the control module controls the four-way reversing valve to reverse its direction, allowing liquid Freon to enter from the third port of the condenser. As the Freon flows through the condenser, the pressure decreases, causing the liquid Freon to turn into gaseous Freon, thus allowing the condenser to absorb heat from the external environment, providing heating for the underfloor heating components. Similarly, when the Freon flows through the plate heat exchanger, the high-temperature, high-pressure gaseous Freon cools and turns into liquid Freon, heating the underfloor heating water in the plate heat exchanger. During the heating process of the air conditioning system described above, the temperature of the Freon entering the condenser via the plate heat exchanger is approximately between 10°C and 30°C. For example, in a possible embodiment of the invention, the second preset temperature is 30°C. Thus, when the temperature at the condenser's refrigerant inlet is detected to be lower than the second preset temperature, the air conditioning system can be considered to have started operating in defrost mode.

[0126] See below. Figure 9 When describing the operating parameters of the air conditioning system of the present invention as the operating parameters of the water pump, it is possible to determine whether the cause is water ingress into the refrigerant system.

[0127] like Figure 9 As shown, in one possible implementation, S401 further includes:

[0128] S700: Determines the operating status of the water pump based on its operating parameters;

[0129] S701: Determine whether the cause is fluoride ingress based on the pump's operating status.

[0130] In S700, the operating status of the water pump includes both an abnormal operating state and a normal operating state. In embodiments of the present invention, an abnormal operating state includes the impeller being stopped due to a foreign object jamming it, or the pump stopping due to its own damage. In this case, the pump's operating current can be used to determine whether the stoppage is due to a foreign object jamming or damage. Specifically, if the current through the pump suddenly increases and exceeds the pump's safe current, it indicates that the pump is jammed by a foreign object; if the current suddenly drops to zero, it indicates that the pump has stopped due to damage. Obviously, the operating status of the pump can also be determined by measuring its power, or by detecting its input or output PWM signal. Without departing from the basic principles of the present invention, those skilled in the art can flexibly choose to measure the pump's operating parameters according to the specific application scenario, as long as the pump's operating status can be determined based on the measured operating parameters.

[0131] In S701, the operating status of the water pump can quickly determine whether the cause of the underfloor heating water flow rate in the plate heat exchanger being lower than the preset value is due to the ingress of refrigerant system water. This improves the speed of determining whether the cause of the flow rate being lower than the preset value is due to the ingress of refrigerant system water, thereby reducing the risk of further damage to the air conditioning system due to cracking of the plate heat exchanger.

[0132] like Figure 1 As shown, the water pump in the air conditioning system is a fixed-frequency water pump, and an expansion tank is installed upstream of the fixed-frequency water pump. This expansion tank allows for water replenishment to the underfloor heating components when the plate heat exchanger cracks and leaks. This ensures that the flow rate at the inlet of the fixed-frequency water pump remains constant, or that the flow rate variation is within a preset range. This is so that when the plate heat exchanger leaks, the pressure at the inlet of the fixed-frequency water pump remains constant or the pressure change is less than a preset difference, which can be determined according to specific needs, as long as it does not affect the stable operation of the air conditioning system. It should be noted that although the fixed-frequency water pump described above is located upstream of the plate heat exchanger, this is not limiting. Those skilled in the art can install the fixed-frequency water pump downstream of the plate heat exchanger as needed.

[0133] The following is combined Figure 10 This will illustrate a possible way to determine whether the cause is fluoride system ingress based on the operating status of the water pump.

[0134] like Figure 10 As shown, in one possible implementation, S401 further includes:

[0135] S800: Obtain the operating status of the water pump;

[0136] S801: Determine whether the water pump is in normal operating condition. If yes, execute S802; otherwise, execute S808.

[0137] S802: Obtain the inlet water pressure P1 and outlet water pressure P2 of the plate heat exchanger within a preset time period;

[0138] S803: If both the inlet water pressure P1 and the outlet water pressure P2 show a decreasing trend or both show an increasing trend, then the cause is determined not to be water entering the refrigerant system, and the cause is determined to be blockage of the underfloor heating components. Execute S806.

[0139] S804: If the inlet water pressure P1 shows an upward trend and the outlet water pressure P2 shows a downward trend, then the cause is determined not to be water entering the fluoride system, and the cause is determined to be blockage of the plate heat exchanger. Then execute S807.

[0140] S805: If the inlet water pressure P1 remains unchanged and the outlet water pressure P2 shows a decreasing trend, then the cause is determined to be water entering the fluoride system;

[0141] S806: Issues a warning about blockage in the underfloor heating components;

[0142] S807: Issues a warning about plate heat exchanger blockage;

[0143] S808: The cause has been determined not to be fluoride ingress.

[0144] S809: Issues a reminder to inspect the water pump.

[0145] In the S800, when the flow rate of the underfloor heating water in the plate heat exchanger is lower than a preset value, the operating status of the water pump is obtained. This eliminates the need for the monitoring device to constantly monitor the water pump's operating status, thereby extending the service life of the monitoring device and reducing the power consumption of the air conditioning system.

[0146] In S801, it is determined whether the water pump is in normal operating condition.

[0147] If the water pump is in normal operating condition, then S802 is executed. In S802, the inlet water pressure P1 of the plate heat exchanger is measured based on the aforementioned inlet water pressure sensor, and the outlet water pressure P2 of the plate heat exchanger is measured based on the aforementioned outlet water pressure sensor. The measured inlet water pressure P1 and outlet water pressure P2 are recorded in the control module's database, allowing the control module to obtain historical operating data of the air conditioning system's water pump at any time. The preset time period refers to the time within 1 minute or 2 minutes starting from the moment when the flow rate of the underfloor heating water in the plate heat exchanger is detected to be lower than the preset value.

[0148] In S803, when the underfloor heating components become clogged, the pressure at the inlet of the fixed-frequency water pump decreases, while the pressure at the outlet increases. Since the plate heat exchanger is located between the outlet of the fixed-frequency water pump and the clog point, both the inlet and outlet pressures of the plate heat exchanger will rise. Therefore, when both inlet pressure P1 and outlet pressure P2 show a decreasing trend or both show an increasing trend, the cause can be determined to be a clogged underfloor heating components, rather than water entering the refrigerant system.

[0149] It should be noted that, although the above combination Figure 1 The description states that when a fixed-frequency water pump is installed upstream of the plate heat exchanger and downstream of the underfloor heating system, and both the inlet pressure P1 and the outlet pressure P2 decrease, the underfloor heating system is considered blocked. However, this is not a limiting condition. Obviously, when the fixed-frequency water pump is installed downstream of the plate heat exchanger and upstream of the underfloor heating system, and both the inlet pressure P1 and the outlet pressure P2 increase, the underfloor heating system is considered blocked.

[0150] In S804, when blockage occurs in the plate heat exchanger, the inlet of the plate heat exchanger is located between the outlet of the fixed-frequency water pump and the blockage point, while the outlet of the plate heat exchanger is located between the blockage point and the inlet of the fixed-frequency water pump. Therefore, within a preset time period, the inlet pressure P1 of the plate heat exchanger will increase, and the outlet pressure P2 will decrease. Thus, when the inlet pressure P1 shows an increasing trend and the outlet pressure P2 shows a decreasing trend, the cause is determined to be blockage in the plate heat exchanger, not water entering the refrigerant system.

[0151] In S805, when a crack appears in the plate heat exchanger, the inlet of the plate heat exchanger is located between the outlet of the fixed-frequency water pump and the crack, causing a drop in the pressure at the inlet of the fixed-frequency water pump. At this time, water is added to the underfloor heating system from the water tank, thus keeping the flow rate at the inlet of the fixed-frequency water pump constant, and consequently, keeping the pressure at the inlet of the plate heat exchanger constant. However, when a crack appears in the plate heat exchanger, the outlet is located between the crack and the inlet of the fixed-frequency water pump. Even though water is added to the underfloor heating system from the water tank, some water will enter the refrigerant system, reducing the flow rate at the outlet of the plate heat exchanger and consequently lowering the pressure at the outlet. Therefore, when the inlet pressure P1 remains constant and the outlet pressure P2 shows a decreasing trend, the cause is determined to be water entering the refrigerant system.

[0152] In S806, at the same time as or after determining that the underfloor heating component is blocked in S803, a notification of blockage is issued. This notification can be issued through the display panel of the air conditioning system, through a voice alarm device installed in the air conditioning system, or simultaneously through both the display panel and the voice alarm device installed in the air conditioning system. Obviously, it can also be issued to the user's mobile terminal via communication methods such as WiFi, Bluetooth, ZigBee, NFC, and LiFi.

[0153] In S807, at the same time as or after determining that the plate heat exchanger is blocked in S804, a reminder of plate heat exchanger blockage is issued. The reminder of plate heat exchanger blockage can be issued through the display panel of the air conditioning system, or through the voice alarm device installed in the air conditioning system, or simultaneously through the display panel of the air conditioning system and the voice alarm device installed in the air conditioning system. Obviously, the alarm can also be issued to the user's mobile terminal through communication methods such as WiFi, Bluetooth, ZigBee, NFC, LiFi, etc.

[0154] If the water pump is in an abnormal operating state, then S808 is executed. In S808, if the water pump is in an abnormal operating state as in S801, it is determined that the reason for the flow rate of the underfloor heating water in the plate heat exchanger being lower than the preset value is not refrigerant system water ingress. Therefore, the speed at which the air conditioning system determines the cause of the flow rate being lower than the preset value is improved, the time for determining the cause is shortened, and thus the risk of further damage to the air conditioning system caused by refrigerant system water ingress can be further reduced.

[0155] In S809, when it is determined in S808 that the water pump is in an abnormal operating state, that is, when the water pump malfunctions or is stuck, a reminder to repair the water pump is issued. This reminder can be issued through the display panel of the air conditioning system, or through the voice alarm device installed in the air conditioning system, or simultaneously through the display panel of the air conditioning system and the voice alarm device installed in the air conditioning system. Obviously, it can also be issued to the user's mobile terminal through communication methods such as WiFi, Bluetooth, ZigBee, NFC, LiFi, etc.

[0156] In summary, in the preferred embodiment of the present invention, the flow rate of the underfloor heating water in the plate heat exchanger is determined to be lower than a preset value based on the inlet water temperature, outlet water temperature, refrigerant inlet temperature, refrigerant outlet temperature, compressor suction pressure, compressor discharge pressure, indoor temperature, and outdoor temperature. After determining that the flow rate of the underfloor heating water in the plate heat exchanger is lower than the preset value, the reason for the lower flow rate of the underfloor heating water in the plate heat exchanger is determined by combining the operating parameters of the water pump or the inlet water pressure and outlet water pressure of the plate heat exchanger. This determination is made to determine whether the reason for the lower flow rate of the underfloor heating water in the plate heat exchanger is due to water entering the refrigerant system, blockage of the underfloor heating components, or blockage of the plate heat exchanger. Furthermore, after determining the cause of the underfloor heating water flow rate in the plate heat exchanger being lower than the preset value, the present invention can also issue a corresponding maintenance reminder based on the determined cause. In this way, when the plate heat exchanger just begins to become blocked, it can provide timely warning to prevent the plate heat exchanger from freezing and cracking. Alternatively, when water in the plate heat exchanger just begins to leak into the refrigerant system, the present invention can provide timely alarm to avoid further damage to components such as the expansion valve or liquid slugging in the compressor due to water entering the refrigerant system.

[0157] It should be noted that although the steps in the above embodiments are described in a sequential order, those skilled in the art will understand that in order to achieve the effect of this embodiment, different steps do not necessarily need to be executed in such an order. They can be executed simultaneously (in parallel) or in reverse order. These simple changes are all within the protection scope of this application.

[0158] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A control method of an air conditioning system, characterized by, The air conditioning system comprises a compressor, a condenser, a four-way valve, a heat exchanger, and a floor heating assembly, refrigerant can circulate among the compressor, the condenser, and the heat exchanger, and floor heating water of the floor heating assembly can exchange heat with refrigerant flowing through the heat exchanger at the heat exchanger, The control method comprises: judging whether the flow rate of the floor heating water flowing through the heat exchanger is lower than a preset value; if the flow rate is lower than the preset value, judging whether the reason for the flow rate being lower than the preset value is refrigerant system water ingress; when it is determined that the reason is the refrigerant system water ingress, issuing a reminder of the refrigerant system water ingress; wherein the step of judging whether the reason for the flow rate being lower than the preset value is refrigerant system water ingress further comprises: obtaining operating parameters of the air conditioning system; judging whether the reason is the refrigerant system water ingress based on the operating parameters of the air conditioning system.

2. The control method according to claim 1, characterized by, The operating parameters of the air conditioning system comprise suction pressure and discharge pressure of the compressor of the air conditioning system, and the step of judging whether the reason is the refrigerant system water ingress based on the operating parameters of the air conditioning system further comprises: judging the change trend of the suction pressure and the discharge pressure of the compressor of the air conditioning system; if both the suction pressure and the discharge pressure are in a decreasing trend, it is determined that the reason is the refrigerant system water ingress.

3. The control method according to claim 1, characterized by, The operating parameters of the air conditioning system are the defrosting cycle when the air conditioning system last time runs in a defrosting mode, and the step of judging whether the reason is the refrigerant system water ingress based on the operating parameters of the air conditioning system further comprises: judging whether the defrosting cycle when the air conditioning system last time runs in a defrosting mode is less than a preset defrosting cycle; if the defrosting cycle is less than the preset defrosting cycle, it is determined that the reason is the refrigerant system water ingress.

4. The control method according to claim 1, characterized by, The air conditioning system further comprises a water pump for circulating the flow of the floor heating water between the floor heating assembly and the heat exchanger, and the operating parameters of the air conditioning system further comprise operating parameters of the water pump, and the step of judging whether the reason is the refrigerant system water ingress based on the operating parameters of the air conditioning system further comprises: determining the operating state of the water pump based on the operating parameters of the water pump; judging whether the reason is the refrigerant system water ingress based on the operating state.

5. The control method according to claim 4, characterized by The step of judging whether the reason is the refrigerant system water ingress based on the operating state further comprises: if the water pump is in an abnormal operating state, it is determined that the reason is not the refrigerant system water ingress; if the water pump is in a normal operating state, obtaining the inlet water pressure P1 and the outlet water pressure P2 of the heat exchanger in a preset time period, and further judging whether the reason is the refrigerant system water ingress based on the change trend of the inlet water pressure P1 and the outlet water pressure P2.

6. The control method according to claim 5, characterized by The control method further comprises: issuing a reminder of overhauling the water pump at the same time or after it is determined that the reason is not the refrigerant system water ingress.

7. The control method according to claim 5, wherein The step of "judging whether the cause is the refrigerant system water intrusion based on the change trend of the water inlet pressure P1 and the water outlet pressure P2" further comprises: If both the water inlet pressure P1 and the water outlet pressure P2 show a decreasing trend or both show an increasing trend, it is determined that the cause is not the refrigerant system water intrusion, and the cause is determined to be the floor heating assembly blockage; If the water inlet pressure P1 shows an increasing trend and the water outlet pressure P2 shows a decreasing trend, it is determined that the cause is not the refrigerant system water intrusion, and the cause is determined to be the heat exchanger blockage; If the water inlet pressure P1 is constant and the water outlet pressure P2 shows a decreasing trend, it is determined that the cause is the refrigerant system water intrusion.

8. The control method according to claim 7, characterized by, The control method further comprises: issuing a reminder of the floor heating assembly blockage at the same time or after determining the floor heating assembly blockage; issuing a reminder of the heat exchanger blockage at the same time or after determining the heat exchanger blockage.

9. The control method according to claim 1, characterized by, The four-way valve has four interfaces of e, d, c, and s, the compressor has a first interface and a second interface, the condenser has a third interface and a fourth interface, the heat exchanger has a fifth interface, a sixth interface, a seventh interface, and an eighth interface, the first interface is connected with the d interface, the third interface is connected with the eighth interface, the fourth interface is connected with the c interface, the seventh interface is connected with the e interface, the second interface is connected with the s interface, the water outlet of the floor heating assembly is connected with the fifth interface, and the water inlet of the floor heating assembly is connected with the sixth interface, The step of "judging whether the flow rate of the floor heating water flowing through the heat exchanger is lower than a preset value" further comprises: obtaining the water inlet temperature Tw1 of the floor heating water entering the heat exchanger via the fifth interface; obtaining the water outlet temperature Tw2 of the floor heating water flowing out of the heat exchanger via the sixth interface; obtaining the condensing temperature Pdt of the refrigerant flowing through the heat exchanger; if Tw2-Tw1≥△T1 and Pdt-Tw2≤△T2, and the duration of this state is greater than or equal to a first preset time t1, it is determined that the flow rate is lower than the preset value; wherein △T1 is a first threshold value, △T2 is a second threshold value; and / or obtaining the water inlet temperature Tw1 of the floor heating water entering the heat exchanger via the fifth interface and the water outlet temperature Tw2 of the floor heating water flowing out of the heat exchanger via the sixth interface; Acquiring an ambient temperature T 环 ; obtaining the refrigerant temperature Tf1 at the eighth interface; obtaining the refrigerant temperature Tf2 at the seventh interface; if Tw2-Tw1≤△T3, |Tw1-T 环 |≤△T4, |Tw2-T 环 |≤△T5, and Tf1-Tf2≤△T6, and the duration of the state is greater than or equal to a second preset time t2, then it is determined that the flow is lower than the preset value. wherein △T3 is a third threshold value, △T4 is a fourth threshold value, △T5 is a fifth threshold value, and △T6 is a sixth threshold value.

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