A control method and device of an air conditioner, the air conditioner, a storage medium and a program product

Abstract

The application discloses a kind of air conditioner control method, device, air conditioner, storage medium and computer program product, air conditioner includes at least one end device, including target anti-freezing end device, target anti-freezing end device is connected with water valve, water pump by pipeline;The method comprises: in the case where air conditioner heating operation, target anti-freezing end device is closed, whether need to prevent water valve freezing is determined according to outdoor environment temperature and the length of time that target anti-freezing end device is closed;If it is determined that water valve needs to be prevented from freezing, then open water valve and water pump, and then close water valve and water pump after the length of time that water valve and water pump are opened reaches preset operation duration.The scheme, whether need to prevent water valve freezing is determined according to outdoor environment temperature and the length of time that end device is closed, improve the accuracy of anti-freezing control, avoid water valve freeze, improve air conditioner stability.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air conditioners, and particularly relates to an air conditioner control method and device, an air conditioner, a storage medium, and a computer program product, in particular to an air conditioner control method and device for preventing water valve freezing, an air conditioner, a storage medium, and a computer program product. BACKGROUND

[0002] Air source heat pump air conditioners are multifunctional integrated units that have the functions of refrigeration, heating, floor heating, and radiator heating, and are composed of an outdoor main unit and indoor terminal devices. The unit provides air conditioning cold / hot water through the outdoor main unit, which is delivered to the indoor terminal devices by a water pipe system. The terminal devices are divided into floor radiation and fan coil air supply. When users install air source heat pumps, most users will choose to install the water valve of the fan coil terminal outside due to the noise problem of the fan coil terminal. However, the outdoor water pipe may freeze when the outdoor environment temperature is lower than 0℃ in winter, and the volume of the frozen water may increase, which may cause the water pipe to freeze and the water valve to freeze.

[0003] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0004] The present application aims to provide an air conditioner control method, device, air conditioner, storage medium, and computer program product to solve the problem of water pipe freeze and water valve freeze at the outdoor side of the air conditioner terminal device when the outdoor temperature is too low in related solutions, and to achieve the effect of determining whether water valve freezing prevention is needed according to the outdoor environment temperature and the length of time the terminal device is closed, improving the accuracy of the anti-freezing control, avoiding water valve freeze, and improving the stability of the air conditioner.

[0005] The present application provides an air conditioner control method, which includes at least one terminal device; the at least one terminal device includes a target anti-freezing terminal device; the target anti-freezing terminal device is connected to a water valve and a water pump through a pipeline; the water valve is used to control the on-off of water flow, and the water pump is used to control water flow; the valve is set on the outdoor side; the method includes: acquiring the outdoor environment temperature and the length of time the target anti-freezing terminal device is closed when the air conditioner is running and the target anti-freezing terminal device is closed; determining whether water valve freezing prevention is needed according to the outdoor environment temperature and the length of time the target anti-freezing terminal device is closed; if it is determined that water valve freezing prevention is needed, then the water valve and the water pump are opened, and after the length of time the water valve and the water pump are opened reaches a preset running length of time, the water valve and the water pump are closed.

[0006] In some embodiments, determining whether the water valve needs to be prevented from freezing according to the outdoor ambient temperature and the length of time the target anti-freezing end device is closed includes: determining the relationship between the outdoor ambient temperature and a preset anti-freezing temperature; if the outdoor ambient temperature is greater than or equal to the preset anti-freezing temperature, determining that the water valve does not need to be prevented from freezing; if the outdoor ambient temperature is less than the preset anti-freezing temperature, determining a set anti-freezing length according to the range of the outdoor ambient temperature, and then determining whether the water valve needs to be prevented from freezing according to the length of time the target anti-freezing end device is closed and the set anti-freezing length.

[0007] In some embodiments, determining the set anti-freezing length according to the range of the outdoor ambient temperature includes: determining the range of the outdoor ambient temperature, including a first temperature range, a second temperature range, and a third temperature range; if the outdoor ambient temperature is in the first temperature range, determining a preset first length as the set anti-freezing length; if the outdoor ambient temperature is in the second temperature range, determining a preset second length as the set anti-freezing length; if the outdoor ambient temperature is in the third temperature range, determining a preset third length as the set anti-freezing length; wherein the first temperature range > the second temperature range > the third temperature range, and the preset first length > the preset second length > the preset third length.

[0008] In some embodiments, determining whether the water valve needs to be prevented from freezing according to the length of time the target anti-freezing end device is closed and the set anti-freezing length includes: determining the relationship between the length of time the target anti-freezing end device is closed and the set anti-freezing length; if the length of time the target anti-freezing end device is closed is greater than or equal to the set anti-freezing length, determining that the water valve needs to be prevented from freezing; if the length of time the target anti-freezing end device is closed is less than the set anti-freezing length, determining that the water valve does not need to be prevented from freezing.

[0009] In some embodiments, further including: when the water valve and the water pump are turned on, first turning on the water valve, and then turning on the water pump after a preset first time; when the water valve and the water pump are turned off, first turning off the water pump, and then turning off the water valve after a preset second time, wherein the preset first time < the preset second time.

[0010] According to the method, the application provides a control device of an air conditioner. The air conditioner comprises at least one terminal device, and a target anti-freezing terminal device is included in the at least one terminal device. The target anti-freezing terminal device is connected with a water valve and a water pump through a pipeline. The water valve is used to control the opening and closing of water flow, and the water pump is used to control the water flow. The valve is arranged on the outdoor side. The control device comprises: an acquisition unit configured to acquire an outdoor environment temperature and a time length of the target anti-freezing terminal device being closed when the air conditioner is in a heating operation and the target anti-freezing terminal device is closed; and a control unit configured to determine whether the water valve needs to be prevented from freezing according to the outdoor environment temperature and the time length of the target anti-freezing terminal device being closed. The control unit is further configured to open the water valve and the water pump if it is determined that the water valve needs to be prevented from freezing, and then close the water valve and the water pump after the time length of the water valve and the water pump being opened reaches a preset operation time length.

[0011] In some embodiments, the control unit determines whether the water valve needs to be prevented from freezing according to the outdoor environment temperature and the time length of the target anti-freezing terminal device being closed, which comprises: judging the size relationship between the outdoor environment temperature and a preset anti-freezing temperature; determining that the water valve does not need to be prevented from freezing if the outdoor environment temperature is greater than or equal to the preset anti-freezing temperature; and determining a set anti-freezing time length according to the range of the outdoor environment temperature, and then determining whether the water valve needs to be prevented from freezing according to the time length of the target anti-freezing terminal device being closed and the set anti-freezing time length if the outdoor environment temperature is less than the preset anti-freezing temperature.

[0012] In some embodiments, the control unit determines the set anti-freezing time length according to the range of the outdoor environment temperature, which comprises: judging the range of the outdoor environment temperature, which comprises a first temperature range, a second temperature range and a third temperature range; determining a preset first time length as the set anti-freezing time length if the outdoor environment temperature is in the first temperature range; determining a preset second time length as the set anti-freezing time length if the outdoor environment temperature is in the second temperature range; and determining a preset third time length as the set anti-freezing time length if the outdoor environment temperature is in the third temperature range. The first temperature range is greater than the second temperature range, the second temperature range is greater than the third temperature range, the preset first time length is greater than the preset second time length, and the preset second time length is greater than the preset third time length.

[0013] In some embodiments, the control unit determines whether the water valve needs to be prevented from freezing according to the length of time that the target anti-freezing end device is closed and the set anti-freezing length of time, including: determining the size relationship between the length of time that the target anti-freezing end device is closed and the set anti-freezing length of time; if the length of time that the target anti-freezing end device is closed is greater than or equal to the set anti-freezing length of time, it is determined that the water valve needs to be prevented from freezing; if the length of time that the target anti-freezing end device is closed is less than the set anti-freezing length of time, it is determined that the water valve does not need to be prevented from freezing.

[0014] In some embodiments, the control unit is further configured to, when the water valve and the water pump are turned on, first turn on the water valve, and then turn on the water pump after a preset first time; when the water valve and the water pump are turned off, first turn off the water pump, and then turn off the water valve after a preset second time, the preset first time < the preset second time.

[0015] In another aspect, the present application provides an air conditioner, which is matched with the above-mentioned device, and includes the control device of the air conditioner.

[0016] In another aspect, the present application provides a storage medium, which is matched with the above-mentioned method and includes a stored program, wherein the device where the storage medium is located executes the control method of the air conditioner when the program runs.

[0017] In another aspect, the present application provides a computer program product, which includes a computer program and realizes the steps of the control method of the air conditioner when the computer program product is processed and executed.

[0018] According to the scheme of the present application, when the air conditioner is in heating operation and the end device is closed, whether the water valve at the end device needs to be prevented from freezing is determined according to the outdoor environment temperature and the length of time that the end device is closed; if it is determined that the water valve needs to be prevented from freezing, the water valve and the water pump at the end device are turned on, and then the water valve and the water pump are turned off after the length of time that the water valve and the water pump are turned on reaches a preset operation length of time. Thus, by determining whether the water valve needs to be prevented from freezing according to the outdoor environment temperature and the length of time that the end device is closed, the accuracy of the anti-freezing control is improved, the water valve is prevented from freezing, and the stability of the air conditioner is improved.

[0019] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application.

[0020] The technical scheme of the present application will be further described in detail below with the aid of drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1Flowchart of an embodiment of the control method of the air conditioner of the present application;

[0022] Figure 2 Structure diagram of an embodiment of the control device of the air conditioner of the present application;

[0023] Figure 3 System structure diagram of the air conditioner of the present application;

[0024] Figure 4 Flowchart of the control method for preventing the water valve from freezing of the present application.

[0025] In combination with the drawings, the reference signs in the embodiments of the present application are as follows:

[0026] 1 - water outlet temperature sensing bag; 2 - gas-liquid separator; 3 - double-pipe heat exchanger; 4 - water pump; 5 - fin heat exchanger; 6 - flash evaporator; 7 - compressor; 8 - electronic expansion valve; 9 - communication line; 10 - four-way reversing valve; 11 - water inlet temperature sensing bag; 12 - temperature controller; 13 - unit control unit; 14 - low-pressure pressure sensor; 15 - water valve; 16 - total terminal; 102 - acquisition unit; 104 - control unit. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described clearly and completely below in combination with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] In the northern low-temperature region, the units containing water systems such as air source heat pumps will face the problem of freezing. The anti-freezing measures of most units are triggered only in the unit shutdown or standby state. For air source heat pumps, there are multiple terminals, including: floor heating terminal, radiator terminal, fan coil terminal, etc. If the user only uses one terminal when the unit is running, there is a risk of freezing of other terminals. Among them, the fan coil terminal needs to exchange heat between air and water, and the noise is relatively large compared to other terminals. The water valve of the fan coil terminal is usually installed outdoors, and needs to be taken anti-freezing measures in winter.

[0029] Therefore, the present application provides a control method of an air conditioner, which can take anti-freezing measures for the terminal without stopping the air conditioner and emptying the water in the water system, avoid the water pipes and valves of the terminal from being frozen and damaged, and ensure the stable operation of the air conditioner.

[0030] According to an embodiment of the present application, a control method of an air conditioner is provided, the air conditioner comprising at least one terminal device, such asFigure 3 The at least one terminal device includes a target anti-freeze terminal device, such as a fan coil unit terminal; the target anti-freeze terminal device is connected to a water valve and a water pump via pipelines; the water valve is used to control the on / off flow of water, and the water pump is used to control the water flow; the target anti-freeze terminal device is located on the indoor side, and the valve is located on the outdoor side, such as... Figure 3 Water valve 15 in the middle.

[0031] The target terminal devices are not limited to fan coil unit terminals, but can also be other terminals where water valves and pipes may freeze. Since water valves at fan coil unit terminals are typically located outdoors, they are more susceptible to freezing damage due to water freezing inside the pipes. The system structure of this air conditioning system is as follows: Figure 3 As shown, the air conditioner includes a heat pump system and a water-side system. The refrigerant in the heat pump system exchanges heat with the water in the water-side system in the shell-and-tube heat exchanger 3, thereby providing hot or cold water to the user.

[0032] The heat pump system is located on the outdoor side. When the air conditioner is in heating mode, the high-temperature, high-pressure refrigerant discharged from the compressor 7 enters the shell-and-tube heat exchanger 3 after passing through the four-way reversing valve 10, where it exchanges heat with water. The refrigerant then sequentially passes through the electronic expansion valve 8, flash evaporator 6, finned heat exchanger 5, four-way reversing valve 10, and gas-liquid separator 2 before returning to the compressor 7. When the air conditioner is in cooling mode, the high-temperature, high-pressure refrigerant discharged from the compressor 7 sequentially passes through the four-way reversing valve 10, finned heat exchanger 5, flash evaporator 6, electronic expansion valve 8, shell-and-tube heat exchanger 3, four-way reversing valve 10, and gas-liquid separator 2 before returning to the compressor 7. The outlet water temperature sensor 1 detects the outlet water temperature of the shell-and-tube heat exchanger 3, the inlet water temperature sensor 11 detects the inlet water temperature of the shell-and-tube heat exchanger, the low-pressure sensor detects the pressure on the compressor intake side, the thermostat 12 and the unit control unit 13 control the air conditioner's operating status and parameters, and the communication line 9 transmits signals.

[0033] The water-side system includes underfloor heating terminals and fan coil unit terminals, both located on the indoor side. Corresponding water valves and pumps are installed on the water pipes of both the underfloor heating terminals and the fan coil unit terminals. When the valves and pumps are open, water flows through the underfloor heating terminals and fan coil unit terminals respectively, providing heat or cooling to the room. Because the fan coil unit terminals generate noise, the water valve 15 and water pump 4 of the fan coil unit terminals are located on the outdoor side. When the fan coil unit terminals are working, hot water continuously circulates in the pipes, preventing the water valves from freezing. When the fan coil unit terminals are not working, the water flow in the pipes containing water valve 15 and water pump 4 is stagnant, and the water temperature continuously drops to the outdoor temperature. If the outdoor temperature is too low, the water in the pipes will freeze, potentially causing the pipes to crack and the water valve 15 to freeze and break. Therefore, anti-freezing measures are required for water valve 15.

[0034] As Figure 1 shown in the flowchart of an embodiment of the method of the present application. The control method of the air conditioner can include steps S110 to S130.

[0035] At step S110, in the case where the air conditioner is in heating operation and the target anti-freezing end device is closed, the outdoor environment temperature and the length of time for which the target anti-freezing end device is closed are obtained.

[0036] When the air conditioner is in heating operation and the fan coil end is closed, the outdoor temperature is low, and water does not flow in the pipeline of the fan coil end, so the pipeline is more likely to freeze and cause the water valve to freeze. Therefore, at this time, the control logic for preventing the water valve from freezing is triggered, and it is determined whether the water valve needs to be prevented from freezing.

[0037] At step S120, it is determined whether the water valve needs to be prevented from freezing according to the outdoor environment temperature and the length of time for which the target anti-freezing end device is closed.

[0038] In some embodiments, the specific process of determining whether the water valve needs to be prevented from freezing according to the outdoor environment temperature and the length of time for which the target anti-freezing end device is closed in step S120 includes steps S210 to S230.

[0039] Step S210 determines the size relationship between the outdoor environment temperature and the preset anti-freezing temperature.

[0040] Step S220 determines that the water valve does not need to be prevented from freezing if the outdoor environment temperature is greater than or equal to the preset anti-freezing temperature.

[0041] Since the water valve is arranged on the outdoor side, the outdoor environment temperature has a direct impact on whether the water valve freezes. The preset anti-freezing temperature is used to determine whether the pipeline will freeze when the fan coil end is not working, and can be set to 2°C. When the outdoor environment temperature is ≥ 2°C, it is considered that the pipeline will not freeze, and the water valve will not freeze.

[0042] Step S230 determines the set anti-freezing time according to the range of the outdoor environment temperature if the outdoor environment temperature is less than the preset anti-freezing temperature, and then determines whether the water valve needs to be prevented from freezing according to the length of time for which the target anti-freezing end device is closed and the set anti-freezing time.

[0043] When the outdoor environment temperature < 2℃, it is considered that the pipeline may freeze, at this time, it is necessary to combine the length of time that the fan coil terminal is closed to determine whether the water valve will freeze. Specifically, the longer the length of time that the fan coil terminal is closed, the more obvious the water temperature in the pipeline where the water valve is located is reduced, the closer the water temperature is to the outdoor temperature, and the more likely the water is to freeze, causing the water valve to freeze. The lower the outdoor environment temperature, the greater the rate at which the water in the pipeline where the water valve is located is reduced, and the more likely the water is to freeze, causing the water valve to freeze. Therefore, first, the set anti-freezing time corresponding to the current outdoor environment temperature is determined, and then whether the water valve needs to be prevented from freezing is determined according to the size relationship between the length of time that the fan coil terminal is closed and the set anti-freezing time.

[0044] In some embodiments, in step S230, the specific process of determining the set anti-freezing time according to the range in which the outdoor environment temperature is located includes: judging the range in which the outdoor environment temperature is located, including a first temperature range, a second temperature range, and a third temperature range; if the outdoor environment temperature is in the first temperature range, a preset first time is determined as the set anti-freezing time; if the outdoor environment temperature is in the second temperature range, a preset second time is determined as the set anti-freezing time; if the outdoor environment temperature is in the third temperature range, a preset third time is determined as the set anti-freezing time; wherein the first temperature range > the second temperature range > the third temperature range, and the preset first time > the preset second time > the preset third time.

[0045] The lower the outdoor environment temperature, the faster the water in the water pipe freezes, so when setting the anti-freezing time, the set anti-freezing time decreases as the outdoor environment temperature decreases. For example, the first temperature range can be set to -10℃-1℃, the second temperature range can be set to -19℃- -11℃, and the third temperature range can be set to a range less than -20℃. Correspondingly, the preset first time can be set to 3min, the preset second time can be set to 2.5min, and the preset first time can be set to 2min.

[0046] In some embodiments, in step S230, the specific process of determining whether the water valve needs to be prevented from freezing according to the length of time that the target anti-freezing terminal device is closed and the set anti-freezing time includes: judging the size relationship between the length of time that the target anti-freezing terminal device is closed and the set anti-freezing time; if the length of time that the target anti-freezing terminal device is closed is greater than or equal to the set anti-freezing time, it is determined that the water valve needs to be prevented from freezing; if the length of time that the target anti-freezing terminal device is closed is less than the set anti-freezing time, it is determined that the water valve does not need to be prevented from freezing.

[0047] After determining the set anti-freezing time according to the outdoor environment temperature, if the time of closing the fan coil end is greater than or equal to the set anti-freezing time, the time of closing the fan coil end is long enough to make the water in the pipeline cool down and freeze, and the water valve needs to be anti-frozen at this time. If the time of closing the fan coil end is less than the set anti-freezing time, it is considered that the water in the pipeline has not frozen, and there is no need to anti-freeze.

[0048] By judging whether the water valve needs to be prevented from freezing according to the outdoor environment temperature and the time of closing the fan coil end, the accuracy of the anti-freezing control is improved, and the water valve and the pipeline are prevented from freezing.

[0049] At step S130, if it is determined that the water valve needs to be prevented from freezing, the water valve and the water pump are opened, and then after the opening time of the water valve and the water pump reaches a preset running time, the water valve and the water pump are closed, and the time of closing the end device is reset.

[0050] After it is determined that the water valve needs to be prevented from freezing, the water valve and the water pump are opened, the water in the pipeline where the water valve is located starts to circulate, the water with a lower temperature in the pipeline exchanges heat with the water with a higher temperature in the system to increase the water temperature, and the water is prevented from freezing. At the same time, the water with a higher temperature can increase the temperature of the pipeline and the water valve when circulating in the pipeline, and slow down the freezing speed of the water in the pipeline.

[0051] After the water valve and the water pump are opened, the fan coil end is still in a closed state, and the air in the fan coil end does not flow, which cannot provide heat for the user. The preset running time can be set to 1 min. Optionally, the size of the preset running time can also be determined according to the size of the outdoor environment temperature. For example, the lower the outdoor environment temperature, the longer the preset running time, and the higher the outdoor environment temperature, the shorter the preset running time.

[0052] In some embodiments, when the water valve and the water pump are opened, the water valve is opened first, and the water pump is opened after a preset first time; when the water valve and the water pump are closed, the water pump is closed first, and the water valve is closed after a preset second time, and the preset first time is less than the preset second time.

[0053] In order to reduce the resistance when the water pump starts and protect the water pump and the pipeline system, when the water valve and the water pump are opened, the water valve needs to be opened first, and the water pump is opened after a period of time. The preset first time can be set to 15 s. If the water valve is not opened, the water pump needs to overcome a large inlet resistance to start to suck water, which can cause the water pump to be overloaded and even damaged. After the water valve is opened first, the water can start to flow and flush the pipeline, which helps the water pump to start more smoothly and reduces the impact caused by sudden start.

[0054] When the water valve and the water pump are to be closed, if the water valve is directly closed without closing the water pump first, a reverse shock wave can be formed on the impeller of the water pump by the water flow, which can cause great pressure on the impeller and damage the water pump, so the water pump needs to be closed first and then the water valve. The preset second time can be set to 1 min.

[0055] Figure 4 A flowchart of the control method for preventing the water valve from freezing of the present application is shown in FIG. 1, which includes the following steps. Figure 4

[0056] Step 1: After the air conditioning unit is started, the heating mode is set and the fan coil end is not used. At this time, the outdoor environment temperature T is detected. If T > 2℃, no anti-freezing measure is needed; if T≤2℃, step 2 is executed.

[0057] Step 2: The range of T is determined. If -10℃≤T≤1℃, the time t for the fan coil end signal to be disconnected is calculated. If t≥t1, step 3 is executed, otherwise the time t for the fan coil end signal to be disconnected is recalculated. If -19℃≤T≤-11℃, the time t for the fan coil end signal to be disconnected is calculated. If t≥t2, step 3 is executed, otherwise the time t for the fan coil end signal to be disconnected is recalculated. If T≤-20℃, the time t for the fan coil end signal to be disconnected is calculated. If t≥t3, step 3 is executed, otherwise the time t for the fan coil end signal to be disconnected is recalculated. Wherein, t1>t2>t3.

[0058] Step 3: The water valve of the fan coil end is opened, the water pump of the fan coil end is opened after 15s, the water pump is closed after running for Tw time, and the water valve is closed after 1 min.

[0059] The technical scheme of the embodiment is adopted. When the air conditioner is in heating operation and the end device is closed, whether the water valve at the end device needs to be prevented from freezing is determined according to the outdoor environment temperature and the length of time for which the end device is closed. If it is determined that the water valve needs to be prevented from freezing, the water valve and the water pump at the end device are opened, and then the water valve and the water pump are closed after the opening time of the water valve and the water pump reaches the preset operation time. Thus, whether the water valve needs to be prevented from freezing is determined according to the outdoor environment temperature and the length of time for which the end device is closed, the accuracy of the anti-freezing control is improved, the water valve is prevented from being damaged, and the stability of the air conditioner is improved.

[0060] According to the embodiment of the present application, a control device of an air conditioner corresponding to the control method of the air conditioner is also provided. The air conditioner includes at least one end device, as shown in FIG. 2. Figure 3 ​fan-coil terminal and the floor heating terminal; the at least one terminal device includes a target anti-freezing terminal device such as the fan-coil terminal; the target anti-freezing terminal device is connected with a water valve and a water pump through a pipeline; the water valve is used to control the on-off of water flow, and the water pump is used to control water flow; the target anti-freezing terminal device is arranged on the indoor side, and the valve is arranged on the outdoor side, such as Figure 3 the water valve 15 in FIG. 1.

[0061] The target terminal device is not limited to the fan-coil terminal, but can also be other terminal devices in which water valves and water pipes can freeze. Since the water valve of the fan-coil terminal is usually arranged on the outdoor side, the water valve is more likely to freeze due to water freezing in the water pipe. The system structure of the air conditioner is shown in FIG. 1, which includes a heat pump system and a water side system. The refrigerant in the heat pump system exchanges heat with the water in the water side system in the pipe-in-pipe heat exchanger 3, thereby providing hot water or cold water for users. Figure 3

[0062] The heat pump system is located on the outdoor side. When the air conditioner operates in the heating mode, in the heat pump system, the high-temperature and high-pressure refrigerant discharged from the compressor 7 enters the pipe-in-pipe heat exchanger 3 after passing through the four-way valve 10, exchanges heat with the water, and then passes through the electronic expansion valve 8, the flash evaporator 6, the fin heat exchanger 5, the four-way valve 10, and the gas-liquid separator 2 in sequence before returning to the compressor 7. When the air conditioner operates in the cooling mode, the high-temperature and high-pressure refrigerant discharged from the compressor 7 passes through the four-way valve 10, the fin heat exchanger 5, the flash evaporator 6, the electronic expansion valve 8, the pipe-in-pipe heat exchanger 3, the four-way valve 10, and the gas-liquid separator 2 in sequence before returning to the compressor 7. The outlet water temperature sensing bulb 1 is used to detect the outlet water temperature of the pipe-in-pipe heat exchanger 3, the inlet water temperature sensing bulb 11 is used to detect the inlet water temperature of the pipe-in-pipe heat exchanger, the low-pressure pressure sensor is used to detect the pressure on the suction side of the compressor, the temperature controller 12 and the unit control unit 13 are used to control the operating state and operating parameters of the air conditioner, and the communication line 9 is used to transmit signals.

[0063] The water side system includes the floor heating terminal and the fan-coil terminal, and the floor heating terminal and the fan-coil terminal are located on the indoor side. The water pipes in which the floor heating terminal and the fan-coil terminal are located are provided with corresponding water valves and water pumps. When the water valves and the water pumps are turned on, water flows through the floor heating terminal and the fan-coil terminal, respectively, to provide heat or cold to the indoor side. Since the fan-coil terminal produces noise, the water valve 15 and the water pump 4 of the fan-coil terminal are arranged on the outdoor side. When the fan-coil terminal is working, hot water continuously circulates in the pipeline, and the water valve does not freeze. When the fan-coil terminal is not working, the water flow in the pipeline in which the water valve 15 and the water pump 4 are located is in a static state, and the water temperature continuously decreases to the outdoor temperature. If the outdoor temperature is too low, the water in the pipeline will freeze, which will cause the pipeline to crack and the water valve 15 to freeze, so the water valve 15 needs to be anti-freezing.

[0064] ​Referring to Figure 2 Fig. 1 is a structural schematic diagram of an embodiment of the device of the present application. The control device of the air conditioner can include an acquisition unit 102 and a control unit 104.

[0065] The acquisition unit 102 is configured to acquire an outdoor environment temperature and a length of time for which the target anti-freezing end device is closed when the air conditioner is in a heating operation and the target anti-freezing end device is closed.

[0066] When the air conditioner is in a heating operation and the fan coil end is closed, the outdoor temperature is low, and water does not flow in the pipeline of the fan coil end, so the pipeline is more likely to freeze and cause the water valve to freeze. Therefore, at this time, the control logic for preventing the water valve from freezing is triggered to determine whether the water valve needs to be prevented from freezing.

[0067] The control unit 104 is configured to determine whether the water valve needs to be prevented from freezing according to the outdoor environment temperature and the length of time for which the target anti-freezing end device is closed.

[0068] In some embodiments, the specific process by which the control unit 104 determines whether the water valve needs to be prevented from freezing according to the outdoor environment temperature and the length of time for which the target anti-freezing end device is closed includes:

[0069] The control unit 104 is specifically further configured to determine the size relationship between the outdoor environment temperature and a preset anti-freezing temperature.

[0070] The control unit 104 is specifically further configured to determine that the water valve does not need to be prevented from freezing if the outdoor environment temperature is greater than or equal to the preset anti-freezing temperature.

[0071] Since the water valve is arranged on the outdoor side, the outdoor environment temperature has a direct impact on whether the water valve freezes. The preset anti-freezing temperature is used to determine whether the pipeline will freeze when the fan coil end is not working, and can be set to 2°C. When the outdoor environment temperature is ≥ 2°C, it is considered that the pipeline will not freeze, and the water valve will not freeze.

[0072] The control unit 104 is specifically further configured to determine the set anti-freezing length of time according to the range in which the outdoor environment temperature falls if the outdoor environment temperature is less than the preset anti-freezing temperature, and then determine whether the water valve needs to be prevented from freezing according to the length of time for which the target anti-freezing end device is closed and the set anti-freezing length of time.

[0073] When the outdoor environment temperature < 2℃, it is considered that the pipeline may freeze, at this time it is necessary to combine the length of time that the fan coil terminal is closed to determine whether the water valve will freeze. Specifically, the longer the length of time that the fan coil terminal is closed, the more obvious the water temperature in the pipeline where the water valve is located will be reduced, the water temperature is closer to the outdoor temperature, and the water is more likely to freeze, causing the water valve to freeze. The lower the outdoor environment temperature, the greater the rate of water temperature reduction in the pipeline where the water valve is located, and the more likely the water is to freeze, causing the water valve to freeze. Therefore, first determine the set anti-freezing time corresponding to the current outdoor environment temperature, and then determine whether the water valve needs to be prevented from freezing according to the size relationship between the length of time that the fan coil terminal is closed and the set anti-freezing time.

[0074] In some embodiments, the control unit 104 determines the specific process of determining the set anti-freezing time according to the range of the outdoor environment temperature, including: determining the range of the outdoor environment temperature, including a first temperature range, a second temperature range, and a third temperature range; if the outdoor environment temperature is in the first temperature range, determining a preset first time as the set anti-freezing time; if the outdoor environment temperature is in the second temperature range, determining a preset second time as the set anti-freezing time; if the outdoor environment temperature is in the third temperature range, determining a preset third time as the set anti-freezing time; wherein the first temperature range > the second temperature range > the third temperature range, and the preset first time > the preset second time > the preset third time.

[0075] The lower the outdoor environment temperature, the faster the water in the water pipe freezes, so when setting the anti-freezing time, the set anti-freezing time decreases as the outdoor environment temperature decreases. For example, the first temperature range can be set to -10℃-1℃, the second temperature range can be set to -19℃- -11℃, and the third temperature range can be set to a range less than -20℃. Correspondingly, the preset first time can be set to 3min, the preset second time can be set to 2.5min, and the preset first time can be set to 2min.

[0076] In some embodiments, the control unit 104 determines the specific process of determining whether the water valve needs to be prevented from freezing according to the length of time that the target anti-freezing terminal device is closed and the set anti-freezing time, including: determining the size relationship between the length of time that the target anti-freezing terminal device is closed and the set anti-freezing time; if the length of time that the target anti-freezing terminal device is closed is greater than or equal to the set anti-freezing time, it is determined that the water valve needs to be prevented from freezing; if the length of time that the target anti-freezing terminal device is closed is less than the set anti-freezing time, it is determined that the water valve does not need to be prevented from freezing.

[0077] After determining the set anti-freezing duration according to the outdoor environment temperature, if the duration of the fan coil end being closed is greater than or equal to the set anti-freezing duration, the duration of the fan coil end being closed is long enough to make the water in the pipeline cool down and freeze, and thus the water valve needs to be subjected to the anti-freezing treatment. If the duration of the fan coil end being closed is less than the set anti-freezing duration, it is considered that the water in the pipeline has not frozen, and thus the anti-freezing treatment is not needed.

[0078] By judging whether the water valve needs to be prevented from freezing according to the outdoor environment temperature and the duration of the fan coil end being closed, the accuracy of the anti-freezing control is improved, and the water valve and the pipeline are prevented from freezing.

[0079] The control unit 104 is further configured to, if it is determined that the water valve needs to be prevented from freezing, turn on the water valve and the water pump, and then turn off the water valve and the water pump after a preset operation duration of the water valve and the water pump being turned on.

[0080] After it is determined that the water valve needs to be prevented from freezing, the water valve and the water pump are turned on, so that the water in the pipeline where the water valve is located starts to circulate. The water with a lower temperature in the pipeline exchanges heat with the water with a higher temperature in the system to increase the temperature of the water, so as to prevent the water from freezing. Meanwhile, the water with a higher temperature can increase the temperature of the pipeline and the water valve when circulating in the pipeline, so as to slow down the freezing speed of the water in the pipeline.

[0081] After the water valve and the water pump are turned on, the fan coil end is still in a closed state, and the air in the fan coil end does not flow, so that the fan coil end cannot provide heat for the user. The preset operation duration can be set to 1 minute. Alternatively, the size of the preset operation duration can be determined according to the size of the outdoor environment temperature. For example, the lower the outdoor environment temperature, the longer the preset operation duration, and the higher the outdoor environment temperature, the shorter the preset operation duration.

[0082] In some embodiments, the control unit 104 turns on the water valve first and then turns on the water pump after a preset first time when the water valve and the water pump are turned on, and turns off the water pump first and then turns off the water valve after a preset second time when the water valve and the water pump are turned off, the preset first time being less than the preset second time.

[0083] In order to reduce the resistance when the water pump is started and protect the water pump and the pipeline system, the water valve needs to be turned on first and then the water pump is turned on after a period of time when the water valve and the water pump are turned on. The preset first time can be set to 15 seconds. If the water valve is not opened, the water pump needs to overcome a large inlet resistance to start to suck water, which can cause the water pump to be overloaded and even damaged. After the water valve is opened, the water can start to flow and flush the pipeline, which helps the water pump to start more smoothly and reduces the impact caused by sudden start.

[0084] When the water valve and the water pump are to be closed, if the water valve is directly closed without closing the water pump first, a reverse shock wave can be formed on the impeller of the water pump by the water flow, the reverse shock wave can cause great pressure on the impeller, and thus damage the water pump, so the water pump needs to be closed first, and then the water valve. The preset second time can be set to 1 min.

[0085] Figure 4 A flowchart of the control method for preventing the water valve from freezing of the present application is shown in FIG. 1, which comprises the following steps. Figure 4

[0086] Step 1: After the air conditioning unit is started, the heating mode is set, and the fan coil end is not used. At this time, the outdoor environment temperature T is detected. If T > 2℃, no anti-freezing measure is needed; if T≤2℃, step 2 is executed.

[0087] Step 2: The range of T is determined. If -10℃≤T≤1℃, the time t for the fan coil end signal to be disconnected is calculated. If t≥t1, step 3 is executed, otherwise the time t for the fan coil end signal to be disconnected is recalculated; if -19℃≤T≤-11℃, the time t for the fan coil end signal to be disconnected is calculated. If t≥t2, step 3 is executed, otherwise the time t for the fan coil end signal to be disconnected is recalculated; if T≤-20℃, the time t for the fan coil end signal to be disconnected is calculated. If t≥t3, step 3 is executed, otherwise the time t for the fan coil end signal to be disconnected is recalculated. Wherein, t1>t2>t3.

[0088] Step 3: The water valve of the fan coil end is opened, the water pump of the fan coil end is opened after 15s, the water pump is closed after running for Tw time after the water pump is opened, and the water valve is closed after 1 min.

[0089] Since the processing and functions realized by the device of the present embodiment are basically corresponding to the embodiments, principles and examples of the foregoing method, the description of the present embodiment will not be elaborated in detail, and the relevant description in the foregoing embodiments can be referred to, which will not be repeated here.

[0090] By adopting the technical solution of the present application, when the air conditioner is in heating operation and the end device is closed, whether the water valve at the end device needs to be prevented from freezing is determined according to the outdoor environment temperature and the length of time for which the end device is closed; if it is determined that the water valve needs to be prevented from freezing, the water valve and the water pump at the end device are opened, and then the water valve and the water pump are closed after the length of time for which the water valve and the water pump are opened reaches a preset operation length of time. Thus, by determining whether the water valve needs to be prevented from freezing according to the outdoor environment temperature and the length of time for which the end device is closed, the accuracy of the anti-freezing control is improved, the water valve is prevented from being damaged, and the stability of the air conditioner is improved.

[0091] According to the embodiments of the present application, an air conditioner corresponding to the control device of the air conditioner is also provided. The air conditioner can comprise the control device of the air conditioner described above.​

[0092] Since the processing and functions realized by the air conditioner of the embodiment basically correspond to the embodiments, principles and examples of the foregoing device, the description of the embodiment does not describe the details thereof, which can be seen in the relevant description in the foregoing embodiments, and will not be described herein.

[0093] According to the technical solution of the present application, when the air conditioner is in heating operation and the terminal device is closed, it is determined whether the water valve at the terminal device needs to be prevented from freezing according to the outdoor environment temperature and the length of time for which the terminal device is closed; if it is determined that the water valve needs to be prevented from freezing, the water valve and the water pump at the terminal device are opened, and then the water valve and the water pump are closed after the length of time for which the water valve and the water pump are opened reaches a preset operation length of time. Thus, by determining whether the water valve needs to be prevented from freezing according to the outdoor environment temperature and the length of time for which the terminal device is closed, the accuracy of the anti-freezing control is improved, the water valve is prevented from being frozen, and the stability of the air conditioner is improved.

[0094] According to the embodiment of the present application, a storage medium corresponding to the control method of the air conditioner is also provided, and the storage medium comprises a stored program, wherein when the program is executed, the device in which the storage medium is located performs the control method of the air conditioner described above.

[0095] Since the processing and functions realized by the storage medium of the embodiment basically correspond to the embodiments, principles and examples of the foregoing method, the description of the embodiment does not describe the details thereof, which can be seen in the relevant description in the foregoing embodiments, and will not be described herein.

[0096] According to the technical solution of the present application, when the air conditioner is in heating operation and the terminal device is closed, it is determined whether the water valve at the terminal device needs to be prevented from freezing according to the outdoor environment temperature and the length of time for which the terminal device is closed; if it is determined that the water valve needs to be prevented from freezing, the water valve and the water pump at the terminal device are opened, and then the water valve and the water pump are closed after the length of time for which the water valve and the water pump are opened reaches a preset operation length of time. Thus, by determining whether the water valve needs to be prevented from freezing according to the outdoor environment temperature and the length of time for which the terminal device is closed, the accuracy of the anti-freezing control is improved, the water valve is prevented from being frozen, and the stability of the air conditioner is improved.

[0097] According to the embodiment of the present application, a computer program product corresponding to the control method of the air conditioner is also provided, and the computer program product comprises a computer program, and the computer program product is processed to perform the steps of the control method of the air conditioner described above.

[0098] Since the processing and functions realized by the computer program product of the embodiment basically correspond to the embodiments, principles and examples of the foregoing method, the description of the embodiment does not describe the details thereof, which can be seen in the relevant description in the foregoing embodiments, and will not be described herein.

[0099] According to the technical scheme, when the air conditioner is in heating operation and the terminal device is closed, whether the water valve at the terminal device needs to be prevented from freezing is determined according to the outdoor environment temperature and the length of time for which the terminal device is closed; if it is determined that the water valve needs to be prevented from freezing, the water valve and the water pump at the terminal device are turned on, and then the water valve and the water pump are turned off after the length of time for which the water valve and the water pump are turned on reaches a preset operation length of time. Thus, whether the water valve needs to be prevented from freezing is determined according to the outdoor environment temperature and the length of time for which the terminal device is closed, the accuracy of the anti-freezing control is improved, the water valve is prevented from being frozen, and the stability of the air conditioner is improved.

[0100] In conclusion, those skilled in the art can easily understand that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0101] The above merely illustrates the embodiments of the present application, but is not intended to limit the present application. The present application can be variously changed and modified by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. A control method of an air conditioner, characterized by, The air conditioner comprises at least one terminal device; the at least one terminal device comprises a target anti-freezing terminal device; the target anti-freezing terminal device is connected with a water valve and a water pump through pipelines; the water valve is used for controlling the on-off of water flow, and the water pump is used for controlling the flow of water; The water valve is arranged on the outdoor side; The method comprises: In the case that the air conditioner is in heating operation and the target anti-freezing terminal device is closed, the outdoor environment temperature and the time length for which the target anti-freezing terminal device is closed are acquired; Whether the water valve needs to be prevented from freezing is determined according to the outdoor environment temperature and the time length for which the target anti-freezing terminal device is closed; If it is determined that the water valve needs to be prevented from freezing, the water valve and the water pump are opened, and then the water valve and the water pump are closed after the opening time length of the water valve and the water pump reaches a preset operation time length; The determination of whether the water valve needs to be prevented from freezing according to the outdoor environment temperature and the time length for which the target anti-freezing terminal device is closed comprises: The size relationship between the outdoor environment temperature and a preset anti-freezing temperature is determined; If the outdoor environment temperature is greater than or equal to the preset anti-freezing temperature, it is determined that the water valve does not need to be prevented from freezing; If the outdoor environment temperature is less than the preset anti-freezing temperature, a set anti-freezing time length is determined according to the range of the outdoor environment temperature, and then whether the water valve needs to be prevented from freezing is determined according to the time length for which the target anti-freezing terminal device is closed and the set anti-freezing time length.

2. The control method of the air conditioner according to claim 1, characterized by, The determination of the set anti-freezing time length according to the range of the outdoor environment temperature comprises: The range of the outdoor environment temperature is determined, which comprises a first temperature range, a second temperature range and a third temperature range; If the outdoor environment temperature is in the first temperature range, a preset first time length is determined as the set anti-freezing time length; If the outdoor environment temperature is in the second temperature range, a preset second time length is determined as the set anti-freezing time length; If the outdoor environment temperature is in the third temperature range, a preset third time length is determined as the set anti-freezing time length; The first temperature range > the second temperature range > the third temperature range, and the preset first time length > the preset second time length > the preset third time length.

3. The control method of the air conditioner according to claim 1 or 2, characterized by, The determination of whether the water valve needs to be prevented from freezing according to the time length for which the target anti-freezing terminal device is closed and the set anti-freezing time length comprises: The size relationship between the time length for which the target anti-freezing terminal device is closed and the set anti-freezing time length is determined; If the time length for which the target anti-freezing terminal device is closed is greater than or equal to the set anti-freezing time length, it is determined that the water valve needs to be prevented from freezing; If the time length for which the target anti-freezing terminal device is closed is less than the set anti-freezing time length, it is determined that the water valve does not need to be prevented from freezing.

4. The control method of the air conditioner according to claim 1 or 2, characterized by, Further comprising: When the water valve and the water pump are opened, the water valve is opened first, and the water pump is opened after a preset first time; When the water valve and the water pump are closed, the water pump is closed first, and the water valve is closed after a preset second time, and the preset first time < the preset second time.

5. A control device of an air conditioner, characterized by comprising: The air conditioner comprises at least one terminal device; the at least one terminal device comprises a target anti-freezing terminal device; the target anti-freezing terminal device is connected with a water valve and a water pump through a pipeline; the water valve is used for controlling the on-off of water flow, and the water pump is used for controlling the flow of water; The water valve is arranged on the outdoor side; The control device comprises: An acquisition unit configured to acquire an outdoor environment temperature and a length of time during which the target anti-freezing terminal device is closed when the air conditioner is in a heating operation and the target anti-freezing terminal device is closed; A control unit configured to determine whether the water valve needs to be prevented from freezing according to the outdoor environment temperature and the length of time during which the target anti-freezing terminal device is closed; The control unit is further configured to open the water valve and the water pump if it is determined that the water valve needs to be prevented from freezing, and then close the water valve and the water pump after a preset operation length of time is reached during which the water valve and the water pump are opened; The control unit determines whether the water valve needs to be prevented from freezing according to the outdoor environment temperature and the length of time during which the target anti-freezing terminal device is closed, comprising: Judging a size relationship between the outdoor environment temperature and a preset anti-freezing temperature; If the outdoor environment temperature is greater than or equal to the preset anti-freezing temperature, it is determined that the water valve does not need to be prevented from freezing; If the outdoor environment temperature is less than the preset anti-freezing temperature, a set anti-freezing length of time is determined according to a range in which the outdoor environment temperature is located, and then it is determined whether the water valve needs to be prevented from freezing according to the length of time during which the target anti-freezing terminal device is closed and the set anti-freezing length of time.

6. An air conditioner characterized by comprising: Comprise: The control device of the air conditioner according to claim 5.

7. A storage medium, characterized by The storage medium comprises a stored program, wherein when the program is executed, the device in which the storage medium is located performs the control method of the air conditioner according to any one of claims 1 to 4.

8. A computer program product comprising a computer program, characterized in that, The computer program is executed by a processor to implement the steps of the method according to any one of claims 1 to 4.

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