Air conditioner anti-freezing control method, device, equipment and storage medium

Abstract

The present application relates to the technical field of air conditioners, and in particular to an air conditioner anti-freezing control method, device, equipment and storage medium, the present application adjusts the communication state of the reversing device connecting the first water circuit and the second water circuit in the water module, so as to unfreeze each water circuit in the water module in batches, reduce the heat required for unfreezing, and according to the water temperature extreme value of the heat exchange device in the water module, determine which way to unfreeze the first water circuit or the second water circuit, improve the efficiency of unfreezing, avoid the technical problem that the multi-split air conditioner water module unfreezing affects the heating operation of the air conditioner indoor unit, reduce the inflow of refrigerant into the water module during unfreezing, improve the effect of the air conditioner indoor unit during heating, and improve the user experience.

Description

Technical Field

[0001] This invention relates to the field of air conditioner technology, and in particular to an air conditioner antifreeze control method, device, equipment and storage medium. Background Technology

[0002] Multi-split air conditioners typically consist of several indoor air conditioning units and one or more hydraulic modules. The indoor units regulate room temperature, while the hydraulic modules produce hot water. If the multi-split air conditioner operates in a low-temperature environment and the hydraulic modules are not activated, the water flow is stagnant, and the low temperature can cause freezing, affecting the normal operation of the multi-split unit. Defreezing is usually achieved by activating the outdoor unit for heating. However, the large amount of refrigerant flowing through the hydraulic modules severely impacts the heating capacity of the indoor units, affecting the user experience.

[0003] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The main objective of this invention is to provide an air conditioner antifreeze control method, device, equipment, and storage medium, aiming to solve the technical problem in the prior art where the defrosting of the hydraulic module of a multi-split air conditioner affects the heating operation of the indoor unit.

[0005] To achieve the above objectives, the present invention provides an air conditioner antifreeze control method, which is applied to a multi-split air conditioner. The multi-split air conditioner includes an outdoor unit, an indoor unit, and a hydraulic module. The outdoor unit is connected to each indoor unit and the hydraulic module. The hydraulic module includes a heat exchange module, a reversing device, a first water path, and a second water path. The normally open end of the reversing device is connected to the heat exchange module, the first selective end of the reversing device is connected to the first water path, and the second selective end of the reversing device is connected to the second water path. The heat exchange module is equipped with a first electric auxiliary heating device.

[0006] The method includes the following steps:

[0007] When the air conditioner meets the preset freezing conditions, the connection state of the reversing device is adjusted so that the heat exchange module is connected to the first water circuit or the second water circuit through the reversing device;

[0008] After the commutation device is adjusted, the current extreme water temperature of the heat exchange module is obtained;

[0009] Adjust the water inlet flow of the heat exchange module, the operating status of the first electric auxiliary heating device, and / or the operating mode of the heat exchange module according to the current extreme water temperature, so as to increase the water temperature of the first water circuit or the second water circuit.

[0010] Optionally, the heat exchange module is equipped with a water pump for controlling the water flow rate;

[0011] The step of adjusting the water inlet flow rate of the heat exchange module, the operating status of the first electric auxiliary heating device, and / or the operating mode of the heat exchange module according to the current extreme water temperature includes:

[0012] Adjust the speed of the water pump to the rated speed to adjust the water inlet flow rate of the heat exchange module to the rated value;

[0013] After a first time interval, obtain the first extreme value of the current water temperature;

[0014] Determine whether the first current water temperature extreme value is greater than or equal to the first temperature threshold;

[0015] If so, then control the air conditioner to exit antifreeze control.

[0016] Optionally, after determining whether the first current water temperature extreme value is greater than or equal to the first temperature threshold, the method further includes:

[0017] If the first current water temperature extreme value is less than the first temperature threshold, then the first electric auxiliary heating device is turned on.

[0018] Obtain the second extreme value of the current water temperature;

[0019] Determine whether the second current water temperature extreme value is greater than or equal to the second temperature threshold, wherein the second temperature threshold is greater than the first temperature threshold;

[0020] If so, then control the air conditioner to exit antifreeze control.

[0021] Optionally, the first water path includes a water tank, and a second electric auxiliary heating device is provided at the water tank;

[0022] After determining whether the first current water temperature extreme value is greater than or equal to the first temperature threshold, the method further includes:

[0023] If the first current water temperature extreme value is less than the first temperature threshold, and the heat exchange module is connected to the first water circuit, then the first electric auxiliary heating device and / or the second electric auxiliary heating device are turned on.

[0024] Obtain the second extreme value of the current water temperature;

[0025] Determine whether the second current water temperature extreme value is greater than or equal to the second temperature threshold, wherein the second temperature threshold is greater than the first temperature threshold;

[0026] If so, then control the air conditioner to exit antifreeze control.

[0027] Optionally, after determining whether the second current water temperature extreme value is greater than or equal to the second temperature threshold, the method further includes:

[0028] After a first time interval, obtain the third current water temperature extreme value, or after a second time interval, obtain the fourth current water temperature extreme value, wherein the second time interval is longer than the first time interval;

[0029] When the third current water temperature extreme value is less than the third temperature threshold or the fourth current water temperature threshold is less than the first temperature threshold, the heat exchange module heat pump is controlled to operate, where the third temperature threshold is less than the first temperature threshold.

[0030] Optionally, after controlling the heat exchange module heat pump to operate, the method further includes:

[0031] Obtain the fifth current extreme water temperature;

[0032] If the fifth current water temperature extreme value is greater than or equal to the fourth temperature threshold, then the air conditioner is controlled to exit antifreeze control.

[0033] Optionally, adjusting the connectivity state of the commutation device includes:

[0034] The heat exchange module is controlled to connect to the first water path through the reversing device;

[0035] After the first water circuit is deactivated from antifreeze control, the heat exchange module is controlled to connect to the second water circuit through the reversing device.

[0036] Furthermore, to achieve the above objectives, the present invention also proposes an air conditioner antifreeze control device, the air conditioner antifreeze control device comprising:

[0037] An adjustment module is used to adjust the connection state of the reversing device when the air conditioner meets the freezing conditions, so that the heat exchange module is connected to the first water circuit or the second water circuit through the reversing device.

[0038] The acquisition module is used to acquire the current extreme water temperature of the heat exchange module after the commutation device is adjusted;

[0039] The control module is also used to adjust the water inlet flow of the heat exchange module, the operating status of the first electric auxiliary heating device, and / or the operating mode of the heat exchange module according to the current extreme water temperature, so as to increase the water temperature of the first water circuit or the second water circuit.

[0040] In addition, to achieve the above objectives, the present invention also proposes an air conditioner antifreeze control device, the air conditioner antifreeze control device comprising: a memory, a processor, and an air conditioner antifreeze control program stored in the memory and executable on the processor, the air conditioner antifreeze control program being configured to implement the steps of the air conditioner antifreeze control method as described above.

[0041] In addition, to achieve the above objectives, the present invention also proposes a storage medium storing an air conditioner antifreeze control program, wherein when the air conditioner antifreeze control program is executed by a processor, it implements the steps of the air conditioner antifreeze control method described above.

[0042] This invention adjusts the connection state of the reversing device connecting the first and second water channels in the hydraulic module to facilitate batch defrosting of each water channel in the module, reducing the heat required for defrosting. Simultaneously, based on the extreme water temperature of the heat exchange device in the hydraulic module, it determines which method to use for defrosting the first or second water channel, improving defrosting efficiency. This avoids the technical problem in existing multi-split air conditioners where defrosting the hydraulic module affects the heating operation of the indoor unit, reduces refrigerant inflow into the hydraulic module during defrosting, improves the heating effect of the indoor unit, and enhances the user experience. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the structure of the air conditioner antifreeze control device in the hardware operating environment involved in the embodiments of the present invention;

[0044] Figure 2 This is a flowchart illustrating the first embodiment of the air conditioner antifreeze control method of the present invention;

[0045] Figure 3 This is a schematic diagram of a multi-split air conditioner structure according to an embodiment of the air conditioner antifreeze control method of the present invention;

[0046] Figure 4 This is a flowchart illustrating the second embodiment of the air conditioner antifreeze control method of the present invention;

[0047] Figure 5 This is a flowchart illustrating the third embodiment of the air conditioner antifreeze control method of the present invention;

[0048] Figure 6 This is a structural block diagram of the first embodiment of the air conditioner antifreeze control device of the present invention.

[0049] Explanation of icon numbers:

[0050] label name label name 1 outdoor unit 16 pressure valve 2 air conditioner indoor unit 31 water-side heat exchanger 3 Hydraulic module 32 water pump 11 compressor 33 Manual valve 12 Vapor-liquid separator 34 Electric auxiliary heating device 13 Four-way valve 35 Commutation device 14 Outdoor heat exchanger 36 water tank 15 Throttling element 37 Heating coils

[0051] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0052] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0053] Reference Figure 1 , Figure 1 This is a schematic diagram of the structure of an air conditioner antifreeze control device in the hardware operating environment involved in the embodiments of the present invention.

[0054] like Figure 1 As shown, the air conditioner's anti-freeze control device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to enable communication between these components. The user interface 1003 may include a display screen and an input unit such as a keyboard; optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wireless-Fidelity (Wi-Fi) interface). The memory 1005 may be high-speed random access memory (RAM) or stable non-volatile memory (NVM), such as a disk storage device. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0055] Those skilled in the art will understand that Figure 1 The structure shown does not constitute a limitation on the antifreeze control device for air conditioners and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0056] like Figure 1 As shown, the memory 1005, which serves as a storage medium, may include an operating system, a network communication module, a user interface module, and an air conditioner antifreeze control program.

[0057] exist Figure 1In the air conditioner anti-freeze control device shown, the network interface 1004 is mainly used for data communication with the network server; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the air conditioner anti-freeze control device of the present invention can be set in the air conditioner anti-freeze control device, and the air conditioner anti-freeze control device calls the air conditioner anti-freeze control program stored in the memory 1005 through the processor 1001 and executes the air conditioner anti-freeze control method provided in the embodiment of the present invention.

[0058] This invention provides an air conditioner antifreeze control method, referring to... Figure 2 , Figure 2 This is a flowchart illustrating the first embodiment of an air conditioner antifreeze control method according to the present invention.

[0059] In this embodiment, the air conditioner antifreeze control method includes the following steps:

[0060] Step S10: When the air conditioner meets the preset freezing conditions, adjust the connection state of the reversing device so that the heat exchange module is connected to the first water circuit or the second water circuit through the reversing device.

[0061] It should be noted that the executing entity in this embodiment can be the air conditioner device, which has functions such as data processing, data communication, and program execution. The air conditioner device can be the controller of a multi-split air conditioner. Of course, other devices with similar functions can also be used, and this embodiment does not limit this. For ease of explanation, this embodiment uses the controller of a multi-split air conditioner as an example.

[0062] It is worth noting that the air conditioner in this embodiment refers to a multi-split air conditioner. A multi-split air conditioner is an air conditioner with an outdoor unit connected to multiple indoor units, which can simultaneously adjust parameters such as air temperature, humidity, cleanliness, and air flow rate in multiple rooms, including but not limited to cooling, heating, and fresh air circulation modes.

[0063] It should be noted that the reference Figure 3The multi-split air conditioner in this embodiment includes an outdoor unit, indoor units, and a hydraulic module. The outdoor unit is connected to each indoor unit and the hydraulic module. The outdoor unit 1 includes a compressor 11, a vapor-liquid separator 12, a four-way valve 13, an outdoor heat exchanger 14, a throttling element 15, and a pressure valve 16. The throttling element 15 includes a main capillary tube and multiple electronic expansion valves. The number of throttling elements 15 corresponds to the sum of the number of indoor units 2 connected to the outdoor unit and the number of hydraulic modules 3 plus one, i.e., the sum of the number of main capillary tubes and the number of each branch. An electronic expansion valve is provided on each branch corresponding to each indoor unit 2 and each branch corresponding to the hydraulic module 3. In this embodiment, the adjusted opening degree of the throttling element refers to the opening degree of the electronic expansion valve. In this application, expansion tubes or throttling valves with the same or similar functions can also be used instead of electronic expansion valves. This embodiment does not impose specific limitations on this.

[0064] It is understood that in the multi-split air conditioner of this embodiment, the output end of the compressor 11 is connected to the first port of the four-way valve 13, and is connected to the pressure valve 16 (low-pressure valve) through the second port of the four-way valve 13, so as to deliver heat to the indoor unit 2 or the hydraulic module 3 for heat exchange. After heat exchange, the heat flows back to the electronic expansion valve through the pressure valve 16 (high-pressure valve), and then is delivered to the outdoor heat exchanger 14 through the main capillary tube for evaporation and heat absorption. At this time, the outdoor heat exchanger 14 is used as an evaporator. Finally, the heat flows through the third and fourth ports of the four-way valve 13 through the vapor-liquid separator 12 and back to the compressor 11 for the next heating cycle. The number of high-pressure valves is twice the number of electronic expansion valves.

[0065] Furthermore, the hydraulic module in this embodiment includes: a heat exchange module, a reversing device, a first water path, and a second water path. The reversing device can be a three-way valve. The heat exchange module includes: a water-side heat exchanger 31, a water pump 32, a manual valve 33, and an electric auxiliary heating device 34. The manual valve 33 can be a manual ball valve or other equipment with the same or similar on / off valve function. The water-side input terminal of the water-side heat exchanger 31 is connected to the output terminal of the water pump 32, and the water-side output terminal of the water-side heat exchanger 31 is connected to the electric auxiliary heating device 34. The refrigerant-side input terminal of the water-side heat exchanger 31 is connected to the... The pressure valve 16 in the outdoor unit 1 is connected, the refrigerant output end of the water-side heat exchanger 31 is connected to the electronic expansion valve of the outdoor unit 1, the input end of the water pump 32 is connected to the first end of the first manual valve, the second end of the first manual valve can be connected to the water tank 36 or the heating coil 37 depending on the water circuit, the output end of the electric auxiliary heating device 34 is connected to the first end of the second manual valve, the second end of the second manual valve is connected to the first end of the reversing device 35, and the reversing device 35 is connected to the water tank 36 or the heating coil 37 of the first water circuit depending on the water circuit.

[0066] In this embodiment, the water circuit in the hydraulic module is divided into a first water circuit and a second water circuit according to different needs. The first water circuit and the second water circuit are connected to the heat exchange module through a reversing device. When hot water is needed, the normally open end of the three-way valve is connected to the first selective end, so that the water-side heat exchanger, water pump, electric auxiliary heating device, manual valve, three-way valve and water tank constitute the first water circuit to meet the hot water demand. When heating is needed, the normally open end of the three-way valve is connected to the second selective end, so that the water-side heat exchanger, water pump, electric auxiliary heating device, manual valve, three-way valve and heating coil constitute the second water circuit to meet the underfloor heating demand.

[0067] In practice, when the indoor unit of a multi-split air conditioner is in heating mode, the refrigerant is compressed by the compressor to obtain high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant is then transported to the indoor heat exchanger through a four-way valve for condensation and heat dissipation. After exchanging heat with the indoor environment through the indoor heat exchanger, the refrigerant becomes medium-temperature and high-pressure. Then, it passes through the electronic expansion valve and the main capillary tube mentioned above to obtain low-pressure and medium-temperature refrigerant, which is then transported to the outdoor heat exchanger for evaporation to obtain low-temperature and low-pressure refrigerant. Finally, it flows back to the compressor through the four-way valve to complete a single heating process.

[0068] Meanwhile, when the multi-split air conditioner is in underfloor heating operation, the refrigerant is compressed by the compressor to obtain high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant is then transported to the water-side heat exchanger in the heat exchange module through a four-way valve for condensation and heat dissipation. The water-side heat exchanger acts as a condenser, and after exchanging heat with the water in the water circuit, the outlet water temperature is higher than the inlet water temperature, thus heating the water flowing through the water-side heat exchanger to obtain medium-temperature and high-pressure refrigerant. Then, through the electronic expansion valve and main capillary tube mentioned above, it becomes low-pressure and medium-temperature refrigerant, which is then transported to the outdoor heat exchanger for evaporation to obtain low-temperature and low-pressure refrigerant. Finally, it flows back to the compressor through the four-way valve to complete a single heating process. At the same time, the heated water flows back to the heating coil through the electric auxiliary heating device and three-way valve to facilitate underfloor heating.

[0069] Meanwhile, when the multi-split air conditioner is producing hot water, the refrigerant is compressed by the compressor to obtain high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant is then transported through a four-way valve to the water-side heat exchanger in the heat exchange module for condensation and heat dissipation. The water-side heat exchanger acts as a condenser, and after exchanging heat with the water in the water circuit, the outlet water temperature is higher than the inlet water temperature, thus heating the water flowing through the water-side heat exchanger to obtain medium-temperature and high-pressure refrigerant. Then, through the electronic expansion valve and main capillary tube mentioned above, it becomes low-pressure and medium-temperature refrigerant, which is then transported to the outdoor heat exchanger for evaporation to obtain low-temperature and low-pressure refrigerant. Finally, it flows back to the compressor through the four-way valve to complete a single heating process. At the same time, the heated water flows back to the water tank through the electric auxiliary heating device and three-way valve to produce hot water. If there is any excess hot water, it can be stored in the water tank for future use.

[0070] It should be noted that the preset freezing conditions include, but are not limited to, the hydraulic module being in standby or off state, the outdoor ambient temperature of the area where the air conditioner's outdoor unit is located being a second temperature, or the lowest water temperature of the air conditioner's hydraulic module being lower than a first temperature for a certain period of time. In this embodiment, the first temperature is lower than the second temperature. For example, the first temperature is set to 2°C, and the second temperature can be set to 3°C. The range of the above-mentioned duration is (0, 30 min). The air conditioner meets the preset freezing conditions specifically when the air conditioner simultaneously meets the conditions that the hydraulic module is in standby or off state, the outdoor ambient temperature is less than 3°C, and the lowest water temperature of the hydraulic module is lower than 2°C within 1 minute. This indicates that there is a possibility of water circuit freezing, and antifreeze treatment is required.

[0071] It is understood that in this embodiment, the reversing device has two connection states. One is that the normally open end is connected to the first selective end, so that the heat exchange module can connect to the first water circuit through the reversing device to produce hot water. The other is that the normally open end is connected to the second selective end, so that the heat exchange module can connect to the second water circuit through the reversing device to produce underfloor heating. During the antifreeze process of the hydraulic module, it is necessary to control both water circuits to perform antifreeze control.

[0072] Step S20: After the commutation device is adjusted, obtain the current extreme water temperature of the heat exchange module.

[0073] It should be noted that the current extreme water temperature refers to the minimum value among the inlet water temperature, outlet water temperature of the water-side heat exchanger in the heat exchange module, and the total outlet water temperature of the hydraulic module. The total outlet water temperature of the hydraulic module is different from the outlet water temperature of the water-side heat exchanger. This is because if the electric auxiliary heating device in the hydraulic module is activated, it will reheat the outlet water of the water-side heat exchanger, or heat loss in the water circuit will affect the temperature difference between the two. Therefore, this embodiment considers the minimum value among the inlet water temperature, outlet water temperature of the water-side heat exchanger, and total outlet water temperature of the hydraulic module to achieve more accurate heating control, reduce unnecessary refrigerant distribution, and improve heat distribution efficiency.

[0074] Step S30: Adjust the water inlet flow of the heat exchange module, the operating status of the first electric auxiliary heating device, and / or the operating mode of the heat exchange module according to the current extreme water temperature, so as to increase the water temperature of the first water circuit or the second water circuit.

[0075] It is worth noting that, in order to prevent the water circuit in the hydraulic module from freezing, this embodiment increases the water temperature in the water circuit by adjusting one or more of the following methods: the water inlet flow rate of the heat exchange module, the operating status of the first electric auxiliary heating device, and / or the operating mode of the heat exchange module, so as to achieve antifreeze control.

[0076] In practice, even if the hydraulic module is in standby or off state, the water tank may contain hot water at a certain temperature or the water temperature in some parts of the water circuit may be too high to freeze. By adjusting the water inlet of the heat exchange module, the temperature of the overall water circuit can be improved to a certain extent, thus preventing the water circuit from freezing.

[0077] In addition, since the hydraulic module is equipped with an electric auxiliary heating device, the water temperature can also be increased by heating the water circuit through the electric auxiliary heating device. At this time, when working with the water pump, it is not necessary to start the heat pump operation function of the hydraulic module, and therefore there is no need to distribute the refrigerant to the hydraulic module, so it will not affect the normal heating of the air conditioner's indoor unit.

[0078] Finally, if neither of the above two methods can make the air conditioner exit anti-freeze control, you can consider turning on the heat pump mode of the hydraulic module. That is, the refrigerant is distributed to the hydraulic module through the compressor to achieve water heating. As long as the air conditioner exits anti-freeze control, the heat pump mode can be turned off until the air conditioner is detected to meet the preset freezing conditions again, and then the water inlet of the heat exchange module or the operating status of the first electric auxiliary heating device is readjusted.

[0079] This embodiment adjusts the connection state of the reversing device connecting the first and second water channels in the hydraulic module to facilitate batch defrosting of each water channel in the module, reducing the heat required for defrosting. Simultaneously, based on the extreme water temperature of the heat exchange device in the hydraulic module, it determines which method to use for defrosting the first or second water channel, improving defrosting efficiency. This avoids the technical problem in existing multi-split air conditioners where defrosting the hydraulic module affects the heating operation of the indoor unit, reduces refrigerant inflow into the hydraulic module during defrosting, improves the heating performance of the indoor unit, and enhances the user experience.

[0080] refer to Figure 4 , Figure 4 This is a flowchart illustrating a second embodiment of an air conditioner antifreeze control method according to the present invention.

[0081] Based on the first embodiment described above, in this embodiment, step S30 includes:

[0082] Step S301: Adjust the speed of the water pump to the rated speed to adjust the water inlet flow of the heat exchange module to the rated value.

[0083] It should be noted that adjusting the water pump speed to the rated speed can quickly exchange heat between the hot water stored in the water tank or the warm or hot water in other water circuits that is not hot enough to freeze when the heat exchange device is connected to the first water circuit, thereby increasing the overall water temperature and achieving antifreeze control.

[0084] In practice, the water inlet flow rate of the heat exchange module is positively correlated with the rated speed of the water pump.

[0085] Step S302: After a first time interval, obtain the first current extreme value of water temperature.

[0086] It is understandable that the water temperature in the water system needs a certain amount of time to reach a uniform level and avoid the risk of freezing. Otherwise, local freezing of the water system will still cause blockages, making it difficult to thaw and affecting the user experience.

[0087] In this embodiment, the first duration is in the range of (0, 30 min) and can be set to 10 min, which is longer than the duration in the preset freeze conditions.

[0088] Step S303: Determine whether the first current water temperature extreme value is greater than or equal to the first temperature threshold.

[0089] It is worth noting that since the outdoor ambient temperature of the area where the air conditioner outdoor unit is located is uncontrolled, this embodiment determines whether there is a risk of water freezing and whether it is necessary to exit the antifreeze control by using the real-time minimum water temperature of the hydraulic module. The range of the first temperature threshold is (0, 30℃), and in this embodiment it can be set to 10℃. Here, the first temperature threshold is greater than the first temperature and the second temperature of the preset freezing condition mentioned above.

[0090] Step S304: If yes, then control the air conditioner to exit antifreeze control.

[0091] Understandably, if the first current water temperature extreme value of the hydraulic module is greater than or equal to the first temperature threshold, it means that there is no risk of freezing in the water circuit of the hydraulic module in the short term, and the anti-freeze mode can be exited. At the same time, if the first current water temperature extreme value of the hydraulic module is less than the first temperature threshold, it means that there is still a risk of freezing in the short term.

[0092] Furthermore, after step S303, the method further includes:

[0093] If the first current water temperature extreme value is less than the first temperature threshold, then the first electric auxiliary heating device is turned on.

[0094] Obtain the second extreme value of the current water temperature;

[0095] Determine whether the second current water temperature extreme value is greater than or equal to the second temperature threshold, wherein the second temperature threshold is greater than the first temperature threshold;

[0096] If so, then control the air conditioner to exit antifreeze control.

[0097] Understandably, the first electric auxiliary heating device is located between the water-side heat exchanger and the manual valve in the heat exchange module, and is used to heat the water flowing through the water-side heat exchanger.

[0098] It is easy to understand that the range of the second temperature threshold is (0, 30℃), which can be set to 20℃. Just make sure that the second temperature threshold is greater than the first temperature threshold. This is because the water temperature after being heated by electric auxiliary heating will inevitably be higher than the water temperature without electric auxiliary heating. The relatively higher judgment threshold can reduce the risk of water freezing.

[0099] In practice, if adjusting the water inlet of the hydraulic module is insufficient to exit the antifreeze control, and the hydraulic module is still in standby or off state, the electric auxiliary heating device in the hydraulic module can be activated to avoid affecting the refrigerant distribution and reducing the heating effect of the indoor unit of the air conditioner.

[0100] Furthermore, after determining whether the first current water temperature extreme value is greater than or equal to the first temperature threshold, the method further includes:

[0101] If the first current water temperature extreme value is less than the first temperature threshold, and the heat exchange module is connected to the first water circuit, then the first electric auxiliary heating device and / or the second electric auxiliary heating device are turned on.

[0102] Obtain the second extreme value of the current water temperature;

[0103] Determine whether the second current water temperature extreme value is greater than or equal to the second temperature threshold, wherein the second temperature threshold is greater than the first temperature threshold;

[0104] If so, then control the air conditioner to exit antifreeze control.

[0105] It should be noted that, in this embodiment, in addition to the electric auxiliary heating device between the water-side heat exchanger and the manual valve in the heat exchange module, an electric auxiliary heating device is also provided at the water tank to maintain the water temperature. Therefore, if adjusting the water inlet of the hydraulic module is insufficient to exit the antifreeze control, and the hydraulic module is still in standby or off state, the first electric auxiliary heating device in the heat exchange module and the second electric auxiliary heating device at the water tank can be activated to avoid affecting the refrigerant distribution and reducing the heating effect of the air conditioner indoor unit.

[0106] In practice, if adjusting the water inlet of the hydraulic module and starting the electric auxiliary heating device are not enough to exit the antifreeze control, in order to protect the air conditioner, the hydraulic module can be turned on so that the multi-split air conditioner can distribute refrigerant to the water-side heat exchanger for water circuit heating.

[0107] Furthermore, after determining whether the second current water temperature extreme value is greater than or equal to the second temperature threshold, the method further includes:

[0108] After a first time interval, obtain the third current water temperature extreme value, or after a second time interval, obtain the fourth current water temperature extreme value, wherein the second time interval is longer than the first time interval;

[0109] When the third current water temperature extreme value is less than the third temperature threshold or the fourth current water temperature threshold is less than the first temperature threshold, the heat exchange module heat pump is controlled to operate, where the third temperature threshold is less than the first temperature threshold.

[0110] It is understood that the first duration ranges from (0 to 30 min) and can be set to 10 min; the second duration ranges from (0 to 30 min) and can be set to 20 min; the second duration should be longer than the first duration; the third temperature threshold ranges from (0 to 30°C) and can be set to 2°C; the first temperature threshold ranges from (0 to 30°C), and in this embodiment it can be set to 10°C. This embodiment does not impose specific restrictions on this.

[0111] The reason for this setting is that the electric auxiliary heating has been turned on in this embodiment. In a short period of time, the minimum temperature of the hydraulic module meets the preset freezing condition and is very likely to freeze. This indicates that there may be a fault in the electric auxiliary heating, and it is necessary to turn on the heat pump to heat the water circuit with high temperature and high pressure refrigerant. Alternatively, after a period of time, the water circuit heated by the electric auxiliary heating will cool down due to the influence of the low temperature environment, and there is a risk of freezing.

[0112] Furthermore, after controlling the operation of the heat exchange module heat pump, the method further includes:

[0113] Obtain the fifth current extreme water temperature;

[0114] If the fifth current water temperature extreme value is greater than or equal to the fourth temperature threshold, then the air conditioner is controlled to exit antifreeze control.

[0115] In practice, after adjusting the water inlet of the hydraulic module and starting the electric auxiliary heating device, if there is still a risk of freezing, the heat pump can be turned on to distribute refrigerant to the water-side heat exchanger and increase the water temperature until the current water temperature extreme value is greater than the fourth temperature threshold. Then, the air conditioner is controlled to exit the antifreeze control. The range of the fourth temperature threshold is (0, 30℃), which can be set to 30℃.

[0116] In this embodiment, by sequentially adjusting the water inlet flow rate of the heat exchange module, the operating status of the first electric auxiliary heating device, and the operating mode of the heat exchange module, when adjusting the water inlet flow rate of the heat exchange module cannot meet the antifreeze control requirements, the electric auxiliary heating device is activated to heat the water circuit. If adjusting the water inlet flow rate of the heat exchange module and activating the electric auxiliary heating device still cannot meet the antifreeze requirements, the heat exchange module is finally activated to operate in heat pump mode, distributing refrigerant to raise the water circuit temperature, reducing the possibility that the heating capacity of the indoor unit of the multi-split air conditioner will be affected, and improving the heating effect of the indoor unit of the air conditioner.

[0117] refer to Figure 5 , Figure 5 This is a flowchart illustrating a third embodiment of an air conditioner antifreeze control method according to the present invention.

[0118] Based on the second embodiment described above, in this embodiment, step S10 includes:

[0119] Step S101: Control the heat exchange module to connect to the first water path through the reversing device.

[0120] It should be noted that in this embodiment, the connection state of the reversing device is adjusted so that when the first water circuit and the second water circuit are subjected to antifreeze control, the first water circuit where the water tank is located can be prioritized for antifreeze control. This is because the insulation effect of the water tank is much better than that of the pipe, and it is more likely to store hot water. The possibility of achieving the antifreeze function simply by increasing the water inlet of the hydraulic module is also higher. Therefore, in this embodiment, the normally open end of the reversing device can be connected to the first selected end corresponding to the first water circuit to perform antifreeze control on the first water circuit where the water tank is located. The hot water in the water tank can be used to raise the overall water temperature of the water circuit. If there is still a risk of freezing, the water temperature of the first water circuit can be raised by the electric auxiliary heating device. If there is still a risk of freezing, the water temperature of the first water circuit can be raised by the heat pump until the first water circuit is connected, at which point the air conditioner exits the antifreeze control.

[0121] Step S102: After the first water circuit exits the antifreeze control, control the heat exchange module to connect to the second water circuit through the reversing device.

[0122] It is worth noting that if the first water circuit can achieve antifreeze control by adjusting the inlet water flow, then the normally open terminal of the switching device can be connected to the second selector terminal corresponding to the second water circuit. Antifreeze control of the second water circuit can be implemented according to the sequence of adjusting the inlet water flow of the heat exchange module, the operating status of the first electric auxiliary heating device, and / or the operating mode of the heat exchange module. Since the temperature in the water circuit increases after antifreeze control of the first water circuit, and due to the participation of hot water from the tank, the overall water circuit temperature may rise significantly. In this case, it may be possible to increase the inlet water flow to accelerate the flow rate of the second water circuit. Similarly, for antifreeze control, if the water inlet flow of the hydraulic module in the second water circuit is insufficient to exit antifreeze control, and the hydraulic module is still in standby or off state, the first electric auxiliary heating device in the hydraulic module can be activated. Since the first water circuit is shielded, the second electric auxiliary heating device located in the water tank is off and does not need to work, thus increasing the temperature of the second water circuit. If there is still a risk of freezing after adjusting the water inlet flow of the hydraulic module and activating the electric auxiliary heating device, the heat pump can be turned on to distribute refrigerant to the water-side heat exchanger to increase the water circuit temperature until antifreeze control is exited.

[0123] Furthermore, if the first water circuit can achieve antifreeze control by adjusting the inlet flow rate and then activating the first and second electric auxiliary heating devices, then the normally open terminal of the switching device is connected to the corresponding second selector terminal of the second water circuit, and the second water circuit is controlled to perform antifreeze control in the order described above. If the first water circuit can achieve antifreeze control by adjusting the inlet flow rate and then activating the first and second electric auxiliary heating devices and then turning on the heat pump model, then the normally open terminal of the switching device is connected to the corresponding second selector terminal of the second water circuit, and the second water circuit is controlled to perform antifreeze control in the order described above. In other words, the second water circuit only begins antifreeze control after the first water circuit exits antifreeze control.

[0124] This embodiment limits the antifreeze control sequence of the first and second water circuits to maximize the use of existing heat to heat the water circuits, avoiding premature activation of the heat pump, which would occupy the refrigerant distribution of the multi-split air conditioner and affect the heating capacity of the indoor unit.

[0125] Furthermore, this embodiment of the invention also proposes a storage medium storing an air conditioner antifreeze control program, which, when executed by a processor, implements the steps of the air conditioner antifreeze control method described above.

[0126] Since this storage medium adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0127] Reference Figure 6 , Figure 6 This is a structural block diagram of the first embodiment of the air conditioner antifreeze control device of the present invention.

[0128] like Figure 6 As shown, the air conditioner antifreeze control device proposed in this embodiment of the invention includes:

[0129] The adjustment module 10 is used to adjust the connection state of the reversing device when the air conditioner meets the freezing conditions, so that the heat exchange module is connected to the first water circuit or the second water circuit through the reversing device.

[0130] The acquisition module 20 is used to acquire the current extreme water temperature of the heat exchange module after the commutation device is adjusted.

[0131] The control module 30 is also used to adjust the water inlet flow of the heat exchange module, the operating status of the first electric auxiliary heating device, and / or the operating mode of the heat exchange module according to the current extreme water temperature, so as to increase the water temperature of the first water circuit or the second water circuit.

[0132] In one embodiment, the control module 30 is further configured to adjust the speed of the water pump to the rated speed, so as to adjust the water inlet of the heat exchange module to the rated value; after a first time interval, obtain a first current water temperature extreme value; determine whether the first current water temperature extreme value is greater than or equal to a first temperature threshold; if so, control the air conditioner to exit the antifreeze control.

[0133] In one embodiment, the control module 30 is further configured to: activate the first electric auxiliary heating device if the first current water temperature extreme value is less than the first temperature threshold; obtain the second current water temperature extreme value; determine whether the second current water temperature extreme value is greater than or equal to the second temperature threshold, wherein the second temperature threshold is greater than the first temperature threshold; and if so, control the air conditioner to exit antifreeze control.

[0134] In one embodiment, the control module 30 is further configured to: activate the first electric auxiliary heating device and / or the second electric auxiliary heating device if the first current water temperature extreme value is less than the first temperature threshold and the heat exchange module is connected to the first water circuit; obtain the second current water temperature extreme value; determine whether the second current water temperature extreme value is greater than or equal to the second temperature threshold, wherein the second temperature threshold is greater than the first temperature threshold; if so, control the air conditioner to exit antifreeze control.

[0135] In one embodiment, the control module 30 is further configured to obtain a third current water temperature extreme value after a first time interval, or obtain a fourth current water temperature extreme value after a second time interval, wherein the second time interval is longer than the first time interval; and to control the heat exchange module heat pump to operate when the third current water temperature extreme value is less than the third temperature threshold or the fourth current water temperature threshold is less than the first temperature threshold, wherein the third temperature threshold is less than the first temperature threshold.

[0136] In one embodiment, the control module 30 is further configured to obtain a fifth current water temperature extreme value; if the fifth current water temperature extreme value is greater than or equal to a fourth temperature threshold, then control the air conditioner to exit antifreeze control.

[0137] In one embodiment, the adjustment module 10 is further configured to control the heat exchange module to connect to the first water path through the reversing device; and after the first water path exits the antifreeze control, control the heat exchange module to connect to the second water path through the reversing device.

[0138] This embodiment adjusts the connection state of the reversing device connecting the first and second water channels in the hydraulic module to facilitate batch defrosting of each water channel in the module, reducing the heat required for defrosting. Simultaneously, based on the extreme water temperature of the heat exchange device in the hydraulic module, it determines which method to use for defrosting the first or second water channel, improving defrosting efficiency. This avoids the technical problem in existing multi-split air conditioners where defrosting the hydraulic module affects the heating operation of the indoor unit, reduces refrigerant inflow into the hydraulic module during defrosting, improves the heating performance of the indoor unit, and enhances the user experience.

[0139] It should be understood that the above are merely illustrative examples and do not constitute any limitation on the technical solutions of the present invention. In specific applications, those skilled in the art can make settings as needed, and the present invention does not impose any restrictions on this.

[0140] It should be noted that the workflow described above is merely illustrative and does not limit the scope of protection of this invention. In practical applications, those skilled in the art can select some or all of the workflow to achieve the purpose of this embodiment according to actual needs, and no restrictions are imposed here.

[0141] In addition, for technical details not described in detail in this embodiment, please refer to the air conditioner antifreeze control method provided in any embodiment of the present invention, which will not be repeated here.

[0142] Furthermore, it should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0143] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0144] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, 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 (such as read-only memory (ROM) / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0145] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A method for controlling the antifreeze function of an air conditioner, characterized in that, The air conditioner antifreeze control method is applied to a multi-split air conditioner, which includes an outdoor unit, an indoor unit, and a hydraulic module. The outdoor unit is connected to each indoor unit and the hydraulic module. The hydraulic module includes a heat exchange module, a reversing device, a first water path, and a second water path. The normally open end of the reversing device is connected to the heat exchange module, the first selective end of the reversing device is connected to the first water path, and the second selective end of the reversing device is connected to the second water path. The heat exchange module is equipped with a first electric auxiliary heating device and a water pump for controlling the water flow rate. The air conditioner antifreeze control method includes: When the air conditioner meets the preset freezing conditions, the connection state of the reversing device is adjusted so that the heat exchange module is connected to the first water circuit or the second water circuit through the reversing device; After the commutation device is adjusted, the current extreme water temperature of the heat exchange module is obtained; and Adjusting the water inlet flow rate of the heat exchange module, the operating status of the first electric auxiliary heating device, and / or the operating mode of the heat exchange module according to the current extreme water temperature value to increase the water temperature of the first water circuit or the second water circuit, specifically includes: adjusting the speed of the water pump to the rated speed to adjust the water inlet flow rate of the heat exchange module to the rated value; after an interval of a first time period, obtaining the first current extreme water temperature value; determining whether the first current extreme water temperature value is greater than or equal to a first temperature threshold; if so, controlling the air conditioner to exit antifreeze control; If the first current water temperature extreme value is less than the first temperature threshold, then the first electric auxiliary heating device is activated; the second current water temperature extreme value is obtained; it is determined whether the second current water temperature extreme value is greater than or equal to the second temperature threshold, and the second temperature threshold is greater than the first temperature threshold; if so, then the air conditioner is controlled to exit the antifreeze control. After determining whether the second current water temperature extreme value is greater than or equal to the second temperature threshold, the method further includes: after an interval of a first time period, obtaining a third current water temperature extreme value, or after an interval of a second time period, obtaining a fourth current water temperature extreme value, wherein the second time period is greater than the first time period; when the third current water temperature extreme value is less than the third temperature threshold or the fourth current water temperature extreme value is less than the first temperature threshold, controlling the heat exchange module heat pump to operate, wherein the third temperature threshold is less than the first temperature threshold.

2. The air conditioner antifreeze control method as described in claim 1, characterized in that, The first water path includes a water tank, and a second electric auxiliary heating device is provided at the water tank; After determining whether the first current water temperature extreme value is greater than or equal to the first temperature threshold, the method further includes: If the first current water temperature extreme value is less than the first temperature threshold, and the heat exchange module is connected to the first water circuit, then the first electric auxiliary heating device and / or the second electric auxiliary heating device are turned on. Obtain the second extreme value of the current water temperature; Determine whether the second current water temperature extreme value is greater than or equal to the second temperature threshold, wherein the second temperature threshold is greater than the first temperature threshold; and If so, then control the air conditioner to exit antifreeze control.

3. The air conditioner antifreeze control method as described in claim 1, characterized in that, After controlling the operation of the heat exchange module heat pump, the method further includes: Obtain the fifth current extreme water temperature; and If the fifth current water temperature extreme value is greater than or equal to the fourth temperature threshold, then the air conditioner is controlled to exit antifreeze control.

4. The air conditioner antifreeze control method according to any one of claims 1-3, characterized in that, Adjusting the connectivity state of the commutation device includes: Controlling the heat exchange module to connect to the first water path via the reversing device; and After the first water circuit is deactivated from antifreeze control, the heat exchange module is controlled to connect to the second water circuit through the reversing device.

5. An anti-freeze control device for an air conditioner, characterized in that, This invention relates to a multi-split air conditioner, comprising an outdoor unit, indoor units, and a hydraulic module. The outdoor unit is connected to each indoor unit and the hydraulic module. The hydraulic module includes a heat exchange module, a reversing device, a first water path, and a second water path. The normally open end of the reversing device is connected to the heat exchange module, the first selective end of the reversing device is connected to the first water path, and the second selective end of the reversing device is connected to the second water path. The heat exchange module is equipped with a first electric auxiliary heating device and a water pump for controlling the water flow rate. The air conditioner antifreeze control device includes: An adjustment module is used to adjust the connection state of the reversing device when the air conditioner meets the freezing conditions, so that the heat exchange module is connected to the first water circuit or the second water circuit through the reversing device. The acquisition module is used to acquire the current extreme water temperature of the heat exchange module after the commutation device adjustment is completed; and The control module is also used to adjust the water inlet flow of the heat exchange module, the operating status of the first electric auxiliary heating device and / or the operating mode of the heat exchange module according to the current extreme water temperature, so as to increase the water temperature of the first water circuit or the second water circuit. The control module is also used to adjust the speed of the water pump to the rated speed, so as to adjust the water inlet of the heat exchange module to the rated value; After a first time interval, obtain the first extreme value of the current water temperature; Determine whether the first current water temperature extreme value is greater than or equal to the first temperature threshold; If so, then control the air conditioner to exit antifreeze control; The control module is also used to activate the first electric auxiliary heating device if the first current water temperature extreme value is less than the first temperature threshold. Obtain the second extreme value of the current water temperature; Determine whether the second current water temperature extreme value is greater than or equal to the second temperature threshold, wherein the second temperature threshold is greater than the first temperature threshold; If so, then control the air conditioner to exit antifreeze control; The control module is also used to obtain a third current water temperature extreme value after a first time interval, or to obtain a fourth current water temperature extreme value after a second time interval, wherein the second time interval is longer than the first time interval; When the third current water temperature extreme value is less than the third temperature threshold or the fourth current water temperature extreme value is less than the first temperature threshold, the heat exchange module heat pump is controlled to operate, wherein the third temperature threshold is less than the first temperature threshold.

6. An anti-freeze control device for an air conditioner, characterized in that, The air conditioner antifreeze control device includes: a memory, a processor, and an air conditioner antifreeze control program stored in the memory and executable on the processor, wherein the air conditioner antifreeze control program is configured to implement the air conditioner antifreeze control method as described in any one of claims 1 to 4.

7. A storage medium, characterized in that, The storage medium stores an air conditioner antifreeze control program, which, when executed by a processor, implements the air conditioner antifreeze control method as described in any one of claims 1 to 4.

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