Multiple antifreeze protection methods for air conditioners

Abstract

The multiple antifreeze protection method for air conditioners provided by the present invention comprises the following steps: S1, first, using heat source for antifreeze; if the air conditioner unit is equipped with an auxiliary heat source, or any one of an auxiliary electric heater, the heat source is operated for antifreeze; S2, using compressor for antifreeze; if no heat source is installed and the compressor is in good condition, the compressor is automatically operated in heating and hot water making modes for antifreeze; S3, when there is no heat source or the compressor cannot be started, basic water pump antifreeze is performed; the water circulation running water of the pipeline is used to avoid the freezing of the pipeline; according to different ambient temperatures, water temperatures and the installation conditions of the air conditioner, different units are selected to enter the antifreeze mode to make the unit "hot" as quickly as possible to avoid the freezing of the pipeline; and according to different unit external source settings and unit operating environments, the antifreeze mode is automatically selected to avoid the freezing of the unit and the pipeline to the greatest extent.

Description

Technical Field

[0001] The invention relates to air conditioning refrigeration protection technology, and in particular to a multiple antifreeze protection method for an air conditioner. Background Art

[0002] At present, when the air conditioner is in cooling operation, when the indoor and outdoor temperatures are low, the evaporation temperature will also decrease, even below 0°C. At this time, the condensed water precipitated from the indoor air will frost on the surface of the evaporator. As time accumulates, the frost layer will become thicker and thicker, which will eventually affect the normal ventilation and heat exchange of the heat exchanger, resulting in poor cooling effect, and even the frost layer will freeze and break the fan blades. To avoid the above problems, air conditioners are designed with anti-freeze protection function.

[0003] Anti-freeze protection is triggered when the system detects that the temperature of the indoor unit pipe is too low to prevent the evaporator from freezing and freezing. The existing anti-freeze cracking technology for air conditioning coils mainly adds antifreeze medium to the external heat source to reduce the freezing point of heating hot water, but in particularly bad weather conditions, the antifreeze medium is not completely effective. Therefore, the indoor heat exchanger coil temperature is generally detected to determine whether the heat exchanger is frosted. If the indoor coil temperature is lower than a certain value, the compressor stops running, allowing the indoor air to melt the frost on the indoor heat exchanger, and then the compressor is turned on for cooling, thereby avoiding the accumulation of frost on the indoor heat exchanger; but when the indoor heat exchanger coil temperature sensor is not designed reasonably, the indoor coil temperature detection will be distorted under certain harsh working conditions, and it will not be able to protect in time, resulting in the freezing of the indoor heat exchanger. At the same time, when the unit fails, it cannot prevent freezing, which may cause the unit to shut down due to a minor fault, but because there is no effective antifreeze measure, the unit may eventually be frozen and unable to operate forever.

[0004] Therefore, there is an urgent need to improve the existing antifreeze protection technology of air-conditioning units to solve the problems of distorted indoor coil temperature detection and failure to timely perform antifreeze protection on indoor heat exchangers in the existing technology. Summary of the invention

[0005] The multiple antifreeze protection method for air conditioners of the present invention selects different units to enter antifreeze modes according to different ambient temperatures, water temperatures and air conditioner installation conditions, so as to "warm up" the units as quickly as possible to avoid freezing of pipelines; and automatically selects the antifreeze mode according to different unit external source settings and unit operating environments, so as to avoid freezing of the units and pipelines to the greatest extent.

[0006] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is:

[0007] A multiple anti-freezing protection method for an air conditioner. After the compressor of the air conditioner stops for 5 to 10 minutes, the temperatures at the water inlet, water outlet, and terminal water outlet are respectively detected by temperature sensors, and the minimum value Min of the temperatures at the water inlet, water outlet, and terminal water outlet is taken. If the minimum value Min ≤ B °C, where the value range of B is 2 to 6 °C, then it enters the anti-freezing operation. This multiple anti-freezing protection method includes the following steps:

[0008] S1. First, adopt heat source anti-freezing;

[0009] If any one of the auxiliary heat source and / or auxiliary electric heater is installed in the air conditioner unit, then operate the heat source anti-freezing;

[0010] This heat source anti-freezing has four stages S1A, S1B, S1C, and S1D, and the specific operation steps are as follows:

[0011] S1A. Judge whether the anti-freezing entry condition is met. After the anti-freezing entry condition is met, the three-way valve is opened, and the standard pump runs according to the setting; among them, the anti-freezing entry condition is: a. The external environmental temperature ≤ 3 - 8 °C, b. It is continuously detected by the temperature sensor for 5 s that the water inlet temperature ≤ 2 - 4 °C, or the water outlet temperature ≤ 2 - 4 °C, or the terminal water outlet temperature ≤ 2 - 4 °C, c. The compressor has stopped for more than 5 to 8 min, and when all the conditions of a, b, and c are met, it enters the anti-freezing state;

[0012] The pump runs for 3 to 10 minutes, and then the temperatures at the water inlet, water outlet, and terminal water outlet are respectively detected by temperature sensors, and the minimum value Min of the temperatures at the water inlet, water outlet, and terminal water outlet is taken. If the minimum value Min < D °C, where the value range of D is 5 to 10 °C, then switch to the hot water mode for anti-freezing, that is, enter stage S1B;

[0013] If the minimum value Min ≥ D °C, then directly enter the heating mode for anti-freezing, that is, enter stage S1C;

[0014] S1B. According to the unit setting, turn on the external heating device. After starting the hot water production operation, it is necessary to meet the condition that the minimum value Min ≥ E °C, where the value range of E is 5 to 15 °C, to exit the automatic anti-freezing and switch to the heating mode for anti-freezing, that is, enter stage S1C. If it does not meet the condition, the heat source continues to operate;

[0015] S1C. The three-way valve is closed, the standard pump runs according to the set gear, and at the same time the engineering pump is turned on and runs;

[0016] After the pump runs for 3 to 10 minutes, the temperatures at the water inlet, water outlet, and terminal water outlet are respectively detected by temperature sensors, and the minimum value Min of the temperatures at the water inlet, water outlet, and terminal water outlet is taken. If the minimum value Min < D °C, where the value range of D is 5 to 10 °C, then switch to the heating mode for anti-freezing, that is, enter stage S1D;

[0017] If the minimum value Min ≥ D °C, directly exit the anti-freezing function.

[0018] S1D. According to the unit settings, turn on the external heating device. After starting the heating operation, it is necessary to meet the condition that the minimum value Min ≥ E °C, where the value range of E is 5 - 15 °C, to exit the automatic anti-freezing function; otherwise, the heat source continues to operate.

[0019] S2. Use the compressor for anti-freezing.

[0020] If no heat source is installed and the compressor is fault-free and can be normally started and operated, then operate the compressor for anti-freezing, and use the compressor to automatically operate in the heating and hot water production modes for anti-freezing.

[0021] This compressor anti-freezing function has four stages: S2A, S2B, S2C, and S2D. The specific operation steps are as follows:

[0022] S2A. Determine whether the anti-freezing entry condition is met. After meeting the anti-freezing entry condition, the three-way valve opens, and the standard pump starts running according to the setting. The anti-freezing entry condition is: a. The external environmental temperature ≤ 3 - 8 °C; b. Continuously for 5 s, it is detected by the temperature sensor that the inlet water temperature ≤ 2 - 4 °C, or the outlet water temperature ≤ 2 - 4 °C, or the terminal outlet water temperature ≤ 2 - 4 °C; c. The compressor has been stopped for 5 - 8 min or more, and when all the conditions of a, b, and c are met, it enters the anti-freezing state.

[0023] The pump runs for 3 - 10 minutes, and the temperature sensor is used to detect the three temperatures at the inlet water, outlet water, and terminal outlet water respectively. Take the minimum value Min of the temperatures at the inlet water, outlet water, and terminal outlet water. If the minimum value Min < D °C, where the value range of D is 5 - 10 °C, then switch to the hot water production mode for anti-freezing, that is, enter stage S2B.

[0024] If the minimum value Min ≥ D °C, then directly enter the heating mode for anti-freezing, that is, enter stage S2C.

[0025] S2B. The compressor starts according to the hot water production mode. It is necessary to meet the condition that the minimum value Min ≥ F °C, where the value range of F is 10 - 20 °C, to exit the automatic anti-freezing function and switch to the heating mode for anti-freezing, that is, enter stage S2C. If not satisfied, the compressor continues to operate.

[0026] S2C. The three-way valve closes, and the standard pump runs at the set speed. At the same time, the engineering pump starts running.

[0027] After the pump runs for 3 - 10 minutes, then the temperature sensor is used to detect the three temperatures at the inlet water, outlet water, and terminal outlet water respectively. Take the minimum value Min of the temperatures at the inlet water, outlet water, and terminal outlet water. If the minimum value Min < D °C, where the value range of D is 5 - 10 °C, then switch to the heating mode for anti-freezing, that is, enter stage S2D.

[0028] If the minimum value Min≥D℃, the antifreeze function will be exited directly;

[0029] S2D, the compressor starts in heating mode and needs to meet the minimum value Min≥F℃, and the value range of F is 10~20℃, before exiting the automatic antifreeze, otherwise the compressor continues to run;

[0030] S3. Perform basic water pump antifreeze when there is no heat source or the compressor cannot be started;

[0031] The water pump antifreeze has two stages S3A and S3B, such as Figure 4 As shown, the specific operation steps are as follows:

[0032] S3A. After the anti-freezing entry conditions are met, the three-way valve opens and the standard water pump starts running according to the set gear; the anti-freezing entry conditions are: a. The external ambient temperature is ≤3-8℃; b. The inlet water temperature is ≤2-4℃ or the outlet water temperature is ≤2-4℃ or the terminal outlet water temperature is ≤2-4℃ for 5s detected by the temperature sensor; c. The compressor is shut down for more than 5~8min. The anti-freezing state is entered only when the conditions a, b and c are met;

[0033] The compressor of the heat pump unit does not run, the external heat source and the auxiliary electric heating do not run, and the unit relies on the water circuit to enter the hot water side for antifreeze. After the water pump runs on the hot water side for 5 to 15 minutes, it switches to the air conditioning side for antifreeze, that is, it enters the S3B stage;

[0034] S3B, the three-way valve is closed, the standard water pump runs at the highest gear, and the engineering water pump is turned on and running;

[0035] The compressor of the heat pump unit does not run, the external heat source and the auxiliary electric heating do not run, and the water pump continues to run for 5 to 15 minutes. If the exit conditions are still not met, the cycle continues to execute stages S3A and S3B.

[0036] Furthermore, in the heat source antifreeze of step S1, in the level selection of the heat source, the auxiliary heat source>the auxiliary electric heater. If the unit is installed with an auxiliary heat source in the project, the auxiliary heat source is turned on first during the antifreeze process, and the auxiliary electric heater is not turned on. If there is no auxiliary heat source, the auxiliary electric heater is turned on.

[0037] Furthermore, the steps S1 and S2 also include: when the temperature is too low in winter or the ambient temperature sensing package fails, if the ambient temperature sensing package fails, the ambient temperature detection result is not used as a judgment condition for entering anti-freeze, and the water pump antifreeze step S3 is directly executed.

[0038] Furthermore, the steps S1, S2 and S3 also include: according to the fact that the water tank installed in the air conditioner is an optional function, whether there is a water tank is selected according to needs, and the user can choose whether there is a water tank according to needs. If it is chosen not to have a water tank, anti-freeze will not be performed on the hot water side, and only anti-freeze processing will be performed on the air conditioning side.

[0039] Furthermore, the step S1 and the step S2 also include: if one or two of the corresponding temperature sensors at the water inlet, water outlet and terminal water outlet are faulty, only the temperature sensors without faults are judged.

[0040] Furthermore, the steps S1, S2 and S3 also include: when the air-conditioning unit is in the anti-freezing operation process and the normal mode operation conditions are met, the unit exits the anti-freezing operation and directly enters the normal mode operation.

[0041] Furthermore, the steps S1, S2 and S3 also include: since the overall anti-freezing is achieved by the flow of hot water, if the water flow is abnormal during the overall anti-freezing operation, the anti-freezing will not be entered.

[0042] Furthermore, step S1 also includes: when the air-conditioning unit is selected, the user can choose to install a water tank electric heating device. If the user installs both the water tank electric heating and the auxiliary electric heater, due to the power load of the user's home, the two cannot be turned on at the same time. In order to ensure that the air-conditioning unit is not frozen, after entering the heat source antifreeze mode, the air-conditioning unit will automatically turn off the water tank electric heating function to facilitate the smooth opening of the auxiliary electric heater for antifreeze.

[0043] Furthermore, the steps S1, S2 and S3 also include: anti-freeze is a protection function to prevent the user's air-conditioning unit from being damaged by freezing, and has the highest overall priority. Even if the user's air-conditioning is turned off, anti-freeze control will be automatically executed if the conditions are met.

[0044] Furthermore, the steps S1 and S2 also include: the terminal water outlet is a temperature sensing package selected and installed according to user needs, which is used to accurately detect the temperature of the user's water outlet side. If the air-conditioning unit is not installed, the temperature sensing package will not be detected.

[0045] Furthermore, the step S1 and step S2 also include: when the outdoor environment temperature is between B and D when entering anti-freeze for the first time, the anti-freeze control is not performed, the value range of B is 2~6℃, and the value range of D is 5~10℃.

[0046] Furthermore, the steps S1, S2 and S3 also include: firstly antifreeze the hot water side or firstly antifreeze the air conditioning side, and the user can choose according to the needs. By default, the hot water antifreeze process is prioritized.

[0047] Furthermore, the steps S1, S2 and S3 also include: the water pump gear is set according to the specific installation water pump selection, and the water pump gear flow rate is selected>maximum flow rate*75%.

[0048] The beneficial effects of the present invention are:

[0049] In the present invention, in order to solve the antifreeze problem to the greatest extent and reduce the impact on the life of the compressor caused by low-temperature operation, heat source antifreeze is preferably used to avoid damage to the compressor and freezing of pipelines; and when there is no heat source or the compressor cannot be started, the water pump is turned on to make the water circuit run, and the running water circuit is used to prevent freezing, which greatly extends the time that the water circuit may freeze. Basic water pump antifreeze plays a certain role in preventing the freezing of pipelines.

[0050] Moreover, when the unit is running to prevent freezing, energy saving and electricity safety are taken into consideration, and the priority of each heat source operation is set. Without adding extra costs, the failure rate of the unit being damaged by freezing due to low temperature is reduced, and the normal operation of the unit in cold areas is guaranteed to the greatest extent. The overall anti-freeze function greatly reduces the probability of unit freezing without increasing costs, and selects different units to enter the anti-freeze mode according to different ambient temperatures, water temperatures and air conditioning installation conditions, so as to "heat up" the unit as quickly as possible to avoid freezing of the pipeline; at the same time, in order not to affect the normal operation of the air conditioner, if the compressor can operate normally during the anti-freeze process, the unit will operate normally after this round of anti-freeze protection is completed, and will no longer enter the anti-freeze mode; and according to different unit external source settings and unit operating environment, the anti-freeze mode is automatically selected to avoid freezing of the unit and pipelines to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a schematic diagram of the principle of the air conditioning unit in the present invention;

[0052] Figure 2 It is a control flow chart of heat source antifreeze in the present invention;

[0053] Figure 3 is a control flow chart of compressor antifreeze in the present invention;

[0054] Figure 4 It is a control flow chart of water pump antifreeze in the present invention. DETAILED DESCRIPTION

[0055] A multiple antifreeze protection method for an air conditioner, after the compressor of the air conditioner stops for 5 to 10 minutes, in this embodiment, the compressor stops for preferably 7 minutes, and the temperature sensors are used to detect the three temperatures of the water inlet, water outlet, and terminal water outlet respectively, and the minimum value Min of the temperature of the water inlet, water outlet, and terminal water outlet is taken. If the minimum value Min≤B℃, the value range of B is 2 to 6℃, and the value of B in this embodiment is preferably 5℃, then the antifreeze operation is entered, such as Figure 1 As shown, the air conditioner system includes a compressor 1, a hot water side 2, an air conditioning side 3 and a water tank 4, the compressor 1 and the water tank 4 are connected through an inlet and outlet water pipeline 5, the air conditioning side 3 is connected to the inlet and outlet water pipeline 5 through a three-way valve 6, the other side of the air conditioning side 3, the hot water side 2 is directly connected to the inlet and outlet water pipeline 5, and the inlet and outlet water pipeline 5 of the inlet and outlet side of the compressor 1 is also connected to an auxiliary heat source 7, or\ and an auxiliary electric heater 8; the multiple antifreeze protection method includes the following steps:

[0056] S1. First, use heat source to prevent freezing;

[0057] If the air conditioner is equipped with an auxiliary heat source or an auxiliary electric heater (built-in or external), the heat source is operated for antifreeze; the auxiliary heat source is a gas furnace, electric boiler, etc., and the auxiliary electric heater is installed in a built-in or external manner; the optional auxiliary heat source or auxiliary electric heater is used for antifreeze to prevent the compressor from running at low temperature and affecting its life in order to solve the antifreeze problem;

[0058] The heat source antifreeze has four stages: S1A, S1B, S1C and S1D. Figure 2 As shown, the specific operation steps are as follows:

[0059] S1A, determine whether the anti-freezing entry conditions are met. After the anti-freezing entry conditions are met, the three-way valve is opened, and the standard water pump is started and operated as set; wherein the anti-freezing entry conditions are: a. The external ambient temperature is ≤3-8°C. In this embodiment, the preferred reference value of the external ambient temperature is 6°C; b. The inlet water temperature is ≤2-4°C, or the outlet water temperature is ≤2-4°C, or the terminal outlet water temperature is ≤2-4°C, detected by the temperature sensor for 5s continuously. In this embodiment, the reference values ​​of the inlet water temperature, the outlet water temperature and the terminal outlet water temperature are preferably 3°C; c. The compressor is shut down for more than 5-8 minutes. In this embodiment, the preferred reference value of the compressor shutdown time is 6 minutes. The anti-freezing state is entered only when all the conditions a, b and c are met;

[0060] The water pump runs for 3 to 10 minutes. In this embodiment, the preferred running time of the water pump is 6 minutes. Then, the temperature sensors are used to detect the temperatures at the inlet, outlet, and terminal outlet respectively, and the minimum value Min of the temperatures at the inlet, outlet, and terminal outlet is taken. If the minimum value Min < D °C, where the value range of D is 5 to 10 °C, and the preferred value of D in this embodiment is 8 °C, then switch to the hot water mode for anti-freezing, that is, enter stage S1B;

[0061] If the minimum value Min ≥ D °C, then directly enter the heating mode for anti-freezing, that is, enter stage S1C;

[0062] S1B. According to the unit settings, turn on the external heating device. After starting the hot water production operation, it is necessary to satisfy that the minimum value Min ≥ E °C, where the value range of E is 5 to 15 °C, and the preferred value of E in this embodiment is 12 °C, then exit the automatic anti-freezing and switch to the heating mode for anti-freezing, that is, enter stage S1C. If not satisfied, the heat source continues to run;

[0063] S1C. The three-way valve is closed, the standard water pump runs according to the set gear, and at the same time the engineering water pump is turned on and runs;

[0064] After the water pump runs for 3 to 10 minutes, the preferred running time of the water pump in this embodiment is 6 minutes. Then, the temperature sensors are used to detect the temperatures at the inlet, outlet, and terminal outlet respectively, and the minimum value Min of the temperatures at the inlet, outlet, and terminal outlet is taken. If the minimum value Min < D °C, where the value range of D is 5 to 10 °C, and the preferred value of D in this embodiment is 8 °C, then switch to the heating mode for anti-freezing, that is, enter stage S1D;

[0065] If the minimum value Min ≥ D °C, then directly exit the anti-freezing;

[0066] S1D. According to the unit settings, turn on the external heating device. After starting the heating operation, it is necessary to satisfy that the minimum value Min ≥ E °C, where the value range of E is 5 to 15 °C, and the preferred value of E in this embodiment is 12 °C, then exit the automatic anti-freezing, otherwise the heat source continues to run;

[0067] S2. Use the compressor for anti-freezing;

[0068] If no heat source is installed and the compressor has no faults and can be normally turned on and run, then run the compressor for anti-freezing, and use the compressor to automatically run in the heating and hot water production modes for anti-freezing;

[0069] This compressor anti-freezing has four stages S2A, S2B, S2C, and S2D, as Figure 3 shown, and the specific operation steps are as follows:

[0070] S2A. Determine whether the anti-freezing entry condition is met. After the anti-freezing entry condition is met, the three-way valve opens, and the standard pump starts running according to the setting; among them, the anti-freezing entry condition is: a. The external environmental temperature ≤ 3 - 8°C. In this embodiment, the preferred reference value of the external environmental temperature is 6°C. b. Continuously for 5 s, the detected inlet water temperature ≤ 2 - 4°C, or the outlet water temperature ≤ 2 - 4°C, or the terminal outlet water temperature ≤ 2 - 4°C. In this embodiment, the reference values of the inlet water temperature, the outlet water temperature, and the terminal outlet water temperature are all preferably 3°C. c. The compressor has been stopped for 5 - 8 min or more. In this embodiment, the preferred reference value of the compressor shutdown time is 6 min. And when all the conditions of a, b, and c are met, it enters the anti-freezing state;

[0071] The pump runs for 3 - 10 minutes. In this embodiment, the preferred running time of the pump is 6 minutes. The three temperatures at the inlet water, the outlet water, and the terminal outlet water are respectively detected by the temperature sensor, and the minimum value Min of the temperatures at the inlet water, the outlet water, and the terminal outlet water is taken. If the minimum value Min < D°C, and the value range of D is 5 - 10°C. In this embodiment, the preferred value of D is 8°C, then it switches to the hot water mode for anti-freezing, that is, enters stage S2B;

[0072] If the minimum value Min ≥ D°C, then it directly enters the heating mode for anti-freezing, that is, enters stage S2C;

[0073] S2B. The compressor starts according to the hot water mode. It is necessary to meet the condition that the minimum value Min ≥ F°C, and the value range of F is 10 - 20°C. In this embodiment, the preferred value of F is 17°C, then it exits the automatic anti-freezing and switches to the heating mode for anti-freezing, that is, enters stage S2C. If it does not meet the condition, the compressor continues to run;

[0074] S2C. The three-way valve closes, and the standard pump runs according to the set gear, and at the same time the engineering pump starts running;

[0075] After the pump runs for 3 - 10 minutes, in this embodiment, the preferred running time of the pump is 6 minutes. Then the three temperatures at the inlet water, the outlet water, and the terminal outlet water are respectively detected by the temperature sensor, and the minimum value Min of the temperatures at the inlet water, the outlet water, and the terminal outlet water is taken. If the minimum value Min < D°C, and the value range of D is 5 - 10°C. In this embodiment, the preferred value of D is 8°C, then it switches to the heating mode for anti-freezing, that is, enters stage S2D;

[0076] If the minimum value Min ≥ D°C, then it directly exits the anti-freezing;

[0077] S2D. The compressor starts according to the heating mode. It is necessary to meet the condition that the minimum value Min ≥ F°C, and the value range of F is 10 - 20°C. In this embodiment, the preferred value of F is 17°C, then it exits the automatic anti-freezing, otherwise the compressor continues to run;

[0078] S3. When there is no heat source or the compressor cannot be started, basic water pump antifreeze is performed; it plays a certain role in preventing the pipes from freezing; start the water pump to make the water line run, and use the water circulation in the pipes to run the water to avoid the pipes from freezing.

[0079] The water pump antifreeze has two stages S3A and S3B, such as Figure 4 As shown, the specific operation steps are as follows:

[0080] S3A. After the anti-freezing entry conditions are met, the three-way valve is opened, and the standard water pump is started and operated according to the set gear; wherein the anti-freezing entry conditions are: a. The external ambient temperature is ≤3-8°C. In this embodiment, the preferred reference value of the external ambient temperature is 6°C; b. The inlet water temperature is ≤2-4°C, or the outlet water temperature is ≤2-4°C, or the terminal outlet water temperature is ≤2-4°C detected by the temperature sensor for 5 seconds. In this embodiment, the reference values ​​of the inlet water temperature, the outlet water temperature and the terminal outlet water temperature are preferably 3°C; c. The compressor is shut down for more than 5-8 minutes. In this embodiment, the preferred reference value of the compressor shutdown time is 6 minutes. The anti-freezing state is entered only when all the conditions a, b and c are met;

[0081] The compressor of the heat pump unit does not run, and the external heat source and auxiliary electric heating do not run. The unit relies on the water circuit to enter the hot water side for antifreeze. After the water pump runs on the hot water side for 5 to 15 minutes, it switches to the air conditioning side for antifreeze. The water pump runs on the hot water side for 10 minutes, which means it enters the S3B stage.

[0082] S3B, the three-way valve is closed, the standard water pump runs at the highest gear, and the engineering water pump is turned on and running;

[0083] The compressor of the heat pump unit does not run, the external heat source and the auxiliary electric heating do not run, and the water pump continues to run for 5 to 15 minutes, wherein the water pump continues to run for preferably 10 minutes. If the exit condition is still not met, the cycle continues to execute stages S3A and S3B.

[0084] Moreover, in the above steps, in the heat source antifreeze of step S1, in the level selection of the heat source, the auxiliary heat source>the auxiliary electric heater. If the unit is installed with an auxiliary heat source in the project, the auxiliary heat source is turned on first during the antifreeze process, and the auxiliary electric heater is not turned on. If there is no auxiliary heat source, the auxiliary electric heater is turned on.

[0085] Step S1 and step S2 also include: when the temperature is too low in winter or the ambient temperature sensor fails, if the ambient temperature sensor fails, the ambient temperature detection result is not used as a judgment condition for entering anti-freeze, and step S3 of water pump antifreeze is directly executed.

[0086] The steps S1, S2 and S3 also include: 1. The water tank installed in the air conditioner is an optional function. Whether there is a water tank is optional according to the needs. The user can choose whether there is a water tank according to the needs. If there is no water tank, the anti-freeze treatment does not perform anti-freeze treatment on the hot water side, and only performs anti-freeze treatment on the air conditioning side; 2. At the water inlet, water outlet and terminal water outlet, if 1 or 2 temperature sensors corresponding to the temperature sensors fail, only the temperature sensors without failure are judged; 3. When the air-conditioning unit is in the anti-freeze operation process and the normal mode operation conditions are met, the unit exits the anti-freeze operation and directly enters the normal mode operation; 4. Since the overall anti-freeze is achieved by the flow of hot water, if the overall anti-freeze is If the water flow is abnormal during the anti-freeze operation, such as blockage, the anti-freeze mode will not be entered; 5. When selecting the air-conditioning unit, the user can also choose to install an electric water tank heating device. If the user installs both the electric water tank heating and the auxiliary electric heater at the same time, due to the power load of the user's home, the two cannot be turned on at the same time. In order to ensure that the air-conditioning unit is not damaged by freezing, after entering the heat source anti-freeze mode, the air-conditioning unit will automatically turn off the electric water tank heating function, so as to facilitate the smooth opening of the auxiliary electric heater for anti-freeze; 6. Anti-freeze is a protection function to prevent the user's air-conditioning unit from being damaged by freezing. It has the highest overall priority. Even if the user's air-conditioning is turned off, it will automatically execute anti-freeze control if the conditions are met. 7. The terminal water outlet is equipped with a temperature sensing package selected according to user needs, which is used to accurately detect the temperature of the user's water outlet side. If the air-conditioning unit is not installed, this temperature sensing package will not be detected; 7. When the outdoor ambient temperature is between B and D when the anti-freeze function is entered for the first time, the anti-freeze control will not be performed. The value range of B is 2~6℃. In this embodiment, the value of B is preferably 5℃. The value range of D is 5~10℃. In this embodiment, the value of D is preferably 8℃; 8. Perform antifreeze on the hot water side or the air-conditioning side first. Users can choose according to their needs. The default is to prioritize hot water antifreeze processing; 9. The water pump setting gear is selected according to the specific installed water pump, and the water pump gear flow rate > maximum flow rate * 75% is selected.

[0087] In this embodiment, different units are selected to enter the antifreeze mode according to different ambient temperatures, water temperatures and air conditioner installation conditions, so as to "heat up" the units as quickly as possible to avoid freezing of the pipelines; and according to different unit external source settings and unit operating environments, the antifreeze mode is automatically selected to avoid freezing of the units and pipelines to the greatest extent. While operating the unit for antifreeze, energy saving and electricity safety are taken into consideration, and the priority of each heat source operation is set. Without increasing additional costs, the failure rate of the unit due to freezing caused by low temperature is reduced, and the normal operation of the unit in cold areas is guaranteed to the greatest extent. The overall antifreeze function greatly reduces the probability of unit freezing without increasing costs; at the same time, in order not to affect the normal operation of the air conditioner, if the compressor can operate normally during the antifreeze process, the unit will operate normally after this round of antifreeze protection is completed, and will no longer enter the antifreeze mode.

[0088] The above-described embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Except for the cases listed in the specific embodiments, all equivalent changes made according to the shape, structure and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A multiple antifreeze protection method for air conditioners, wherein the compressor of the air conditioner stops for 5 to 10 minutes, and the temperature sensors are used to detect the three temperatures of the water inlet, water outlet, and terminal water outlet, respectively, and the minimum value Min of the temperatures of the water inlet, water outlet, and terminal water outlet is taken. If the minimum value Min≤B℃, and the value range of B is 2 to 6℃, then the antifreeze operation is entered, characterized in that: The multiple anti-freezing protection method includes the following steps: S1. First, use a heat source for anti-freezing; If any one of the auxiliary heat source and / or auxiliary electric heater is installed in the air conditioner unit, the heat source anti-freezing is operated; This heat source anti-freezing has four stages S1A, S1B, S1C, and S1D, and the specific operation steps are as follows: S1A. Determine whether the anti-freezing entry condition is met. After the anti-freezing entry condition is met, the three-way valve is opened, and the standard pump is started and operated according to the setting; among them, the anti-freezing entry condition is: a. The external ambient temperature ≤ 3 - 8°C, b. The inlet water temperature ≤ 2 - 4°C, or the outlet water temperature ≤ 2 - 4°C, or the terminal outlet water temperature ≤ 2 - 4°C is detected by the temperature sensor for 5s continuously, c. The compressor has been stopped for more than 5 - 8 minutes, and when all the conditions of a, b, and c are met, it enters the anti-freezing state; The pump runs for 3 - 10 minutes, and then the temperature sensor is used to detect the three temperatures at the inlet, outlet, and terminal outlet respectively. Take the minimum value Min of the temperatures at the inlet, outlet, and terminal outlet. If the minimum value Min < D°C, and the value range of D is 5 - 10°C, then switch to the hot water mode for anti-freezing, that is, enter stage S1B; If the minimum value Min ≥ D°C, then directly enter the heating mode for anti-freezing, that is, enter stage S1C; S1B. According to the unit setting, turn on the external heating device. After starting the hot water production operation, it is necessary to meet the condition that the minimum value Min ≥ E°C, and the value range of E is 5 - 15°C, then exit the automatic anti-freezing and switch to the heating mode for anti-freezing, that is, enter stage S1C. If not satisfied, the heat source continues to run; S1C. The three-way valve is closed, and the standard pump runs according to the set gear. At the same time, the engineering pump is started and operated; After the pump runs for 3 - 10 minutes, then the temperature sensor is used to detect the three temperatures at the inlet, outlet, and terminal outlet respectively. Take the minimum value Min of the temperatures at the inlet, outlet, and terminal outlet. If the minimum value Min < D°C, and the value range of D is 5 - 10°C, then switch to the heating mode for anti-freezing, that is, enter stage S1D; If the minimum value Min ≥ D°C, then directly exit the anti-freezing; S1D. According to the unit setting, turn on the external heating device. After starting the heating operation, it is necessary to meet the condition that the minimum value Min ≥ E°C, and the value range of E is 5 - 15°C, then exit the automatic anti-freezing, otherwise the heat source continues to run; S2. Use the compressor for anti-freezing; If no heat source is installed and the compressor has no fault and can be normally started and operated, then the compressor anti-freezing is operated, and the compressor automatically runs in the heating and hot water production modes for anti-freezing; This compressor anti-freezing has four stages S2A, S2B, S2C, and S2D, and the specific operation steps are as follows: S2A. Determine whether the anti-freezing entry condition is met. After the anti-freezing entry condition is met, the three-way valve is opened, and the standard pump is started and operated according to the setting; the anti-freezing entry condition is: a. The external ambient temperature ≤ 3 - 8°C, b. The inlet water temperature ≤ 2 - 4°C, or the outlet water temperature ≤ 2 - 4°C, or the terminal outlet water temperature ≤ 2 - 4°C is detected by the temperature sensor for 5s continuously, c. The compressor has been stopped for more than 5 - 8 minutes, and when all the conditions of a, b, and c are met, it enters the anti-freezing state; The water pump runs for 3 to 10 minutes. The three temperatures at the water inlet, water outlet, and terminal water outlet are detected respectively through temperature sensors. The minimum value Min of the temperatures at the water inlet, water outlet, and terminal water outlet is taken. If the minimum value Min < D °C, where the value range of D is 5 to 10 °C, then switch to the anti-freezing mode for hot water production, that is, enter stage S2B; If the minimum value Min ≥ D °C, then directly enter the anti-freezing mode for heating, that is, enter stage S2C; In S2B, the compressor starts according to the hot water production mode. It is required to meet the condition that the minimum value Min ≥ F °C, where the value range of F is 10 to 20 °C to exit the automatic anti-freezing and switch to the anti-freezing mode for heating, that is, enter stage S2C. If not satisfied, the compressor continues to run; In S2C, the three-way valve is closed, the standard water pump runs at the set gear, and at the same time the engineering water pump starts to run; After the water pump runs for 3 to 10 minutes, then the three temperatures at the water inlet, water outlet, and terminal water outlet are detected respectively through temperature sensors. The minimum value Min of the temperatures at the water inlet, water outlet, and terminal water outlet is taken. If the minimum value Min < D °C, where the value range of D is 5 to 10 °C, then switch to the anti-freezing mode for heating, that is, enter stage S2D; If the minimum value Min ≥ D °C, then directly exit the anti-freezing; In S2D, the compressor starts according to the heating mode. It is required to meet the condition that the minimum value Min ≥ F °C, where the value range of F is 10 to 20 °C, to exit the automatic anti-freezing, otherwise the compressor continues to run; In S3, when there is no heat source or the compressor cannot start, basic anti-freezing of the water pump is carried out; This water pump anti-freezing has two stages S3A and S3B, and the specific operation steps are as follows: In S3A, after meeting the anti-freezing entry conditions, the three-way valve is opened, and the standard water pump is started and run at the set gear; the anti-freezing entry conditions are: a. The external environmental temperature ≤ 3 - 8 °C, b. It is continuously detected through the temperature sensor for 5 s that the water inlet temperature ≤ 2 - 4 °C, or the water outlet temperature ≤ 2 - 4 °C, or the terminal water outlet temperature ≤ 2 - 4 °C, c. The compressor has been stopped for more than 5 to 8 minutes, and when all the conditions of a, b, and c are met, it enters the anti-freezing state; The compressor of the heat pump unit does not run, the external heat source and auxiliary electric heating do not run, and it relies on the water circuit operation to enter the anti-freezing of the hot water side. After the water pump runs on the hot water side for 5 to 15 minutes, it switches to the anti-freezing of the air-conditioning side, that is, enters stage S3B; In S3B, the three-way valve is closed, the standard water pump runs at the highest gear, and at the same time the engineering water pump starts to run; The compressor of the heat pump unit does not run, the external heat source and auxiliary electric heating do not run. After the water pump continues to run for 5 to 15 minutes, if the exit conditions are still not met, then continue to loop and execute stage S3A and stage S3B.

2. The multiple antifreeze protection method for air conditioner according to claim 1, characterized in that: In the heat source anti-freezing in step S1, in the selection of the heat source level, the auxiliary heat source > the auxiliary electric heater. If the unit is installed with an auxiliary heat source in the project, the auxiliary heat source is preferentially turned on during the anti-freezing process, and the auxiliary electric heater is not turned on. If there is no auxiliary heat source, the auxiliary electric heater is turned on.

3. The multiple antifreeze protection method for air conditioner according to claim 1, characterized in that: Steps S1 and S2 also include: when the winter temperature is too low or the ambient temperature sensor fails, if the ambient temperature sensor fails, the environmental temperature detection result is not used as the judgment condition for entering anti-freezing, and directly execute step S3 of the water pump anti-freezing.

4. The multiple antifreeze protection method for air conditioner according to claim 1, characterized in that: The steps S1, S2 and S3 also include: the water tank installed in the air conditioner is an optional function, and whether there is a water tank is selected according to needs, and the user can choose whether there is a water tank according to needs. If it is chosen not to have a water tank, anti-freeze will not be performed on the hot water side, and only anti-freeze processing will be performed on the air conditioning side.

5. The multiple antifreeze protection method for air conditioner according to claim 1, characterized in that: The step S1 and step S2 also include: if one or two of the corresponding temperature sensors at the water inlet, water outlet and terminal water outlet are faulty, only the temperature sensors without faults are judged.

6. The multiple antifreeze protection method for air conditioner according to claim 1, characterized in that: The steps S1, S2 and S3 also include: when the air-conditioning unit is in the anti-freezing operation process and the normal mode operation conditions are met, the unit exits the anti-freezing operation and directly enters the normal mode operation.

7. The multiple antifreeze protection method for air conditioner according to claim 1, characterized in that: The steps S1, S2 and S3 also include: since the overall anti-freezing is achieved by the flow of hot water, if the water flow is abnormal during the overall anti-freezing operation, the anti-freezing will not be entered.

8. The multiple antifreeze protection method for air conditioner according to claim 1, characterized in that: The step S1 also includes: when the user chooses to install the water tank electric heating device when the air-conditioning unit is selected, if the user installs the water tank electric heating and the auxiliary electric heater at the same time, due to the power load of the user's home, the two cannot be turned on at the same time. In order to ensure that the air-conditioning unit is not frozen, after entering the heat source antifreeze mode, the air-conditioning unit will automatically turn off the water tank electric heating function to facilitate the smooth opening of the auxiliary electric heater for antifreeze.

9. The multiple antifreeze protection method for air conditioner according to claim 1, characterized in that: The steps S1, S2 and S3 also include: anti-freeze as a protection function to prevent the user's air-conditioning unit from being frozen and damaged, with the highest overall priority. Even if the user's air-conditioning is turned off, the anti-freeze control will be automatically executed if the conditions are met.

10. A multiple antifreeze protection method for an air conditioner according to claim 1, characterized in that: The steps S1 and S2 also include: the terminal water outlet is a temperature sensing package selected and installed according to user needs, which is used to accurately detect the temperature of the user's water outlet side. If the air conditioning unit is not installed, the temperature sensing package will not be detected.

11. A multiple antifreeze protection method for an air conditioner according to claim 1, characterized in that: The steps S1 and S2 also include: when the outdoor environment temperature is between B and D when the anti-freeze control is entered for the first time, the anti-freeze control is not performed, the value range of B is 2 to 6°C, and the value range of D is 5 to 10°C.

12. The multiple antifreeze protection method for air conditioner according to claim 1, characterized in that: The steps S1, S2 and S3 also include: firstly antifreeze the hot water side or firstly antifreeze the air conditioning side, and the user can choose according to the needs. By default, the hot water antifreeze process is prioritized.

13. The multiple antifreeze protection method for air conditioner according to claim 1, characterized in that: The steps S1, S2 and S3 also include: the water pump setting gear is selected according to the specific installation water pump, and the water pump gear flow rate is selected>maximum flow rate*75%.

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