Antifreeze control method, device, household unit and storage medium

Abstract

The present application relates to an antifreeze control method, device, household unit, and storage medium. The method includes: obtaining a second ambient temperature and a second water inlet temperature and a second water outlet temperature of a heat pump unit; entering an antifreeze mode when the second ambient temperature, the second water inlet temperature, and the second water outlet temperature meet preset antifreeze conditions; in the antifreeze mode, adjusting the opening of the water inlet valve according to the second water inlet temperature and the second water outlet temperature so that water on the water storage side flows into the heat pump unit for antifreeze. In this way, in the antifreeze mode, adjusting the opening of the water inlet valve according to the second water inlet temperature and the second water outlet temperature of the heat pump unit so that water on the water storage side flows into the heat pump unit for antifreeze can not only ensure the stable operation of the heat pump unit and extend the service life of the equipment, but also improve the user experience and reduce maintenance costs. This is of great significance for promoting the widespread application of heat pump technology in cold areas.

Description

Technical Field

[0001] The present application relates to the technical field of smart home appliances, and in particular to an antifreeze control method, device, household machine and storage medium. Background Art

[0002] Heat pumps face significant operational challenges in cold climates, particularly casing damage. The casing in a heat pump unit performs the critical function of the evaporator or condenser. When ambient temperatures drop below freezing, the water inside the casing easily freezes and expands. The continued low temperatures increase the pressure on the casing, ultimately leading to cracking and damage.

[0003] Frozen casings can have devastating consequences for heat pump units. As the core component that enables heat exchange, damaged casings disrupt the unit's cooling and heating cycles, leading to refrigerant leakage and loss of heat exchange functionality. Repairs are difficult and costly, often resulting in the unit being completely scrapped, resulting in significant financial losses for users.

[0004] Therefore, antifreeze technology for heat pump units has become a top research priority in the industry. Heat pump units used in household units with integrated heating and cooling water systems are particularly demanding in terms of their antifreeze performance, as they are directly connected to the home environment and daily use. Effective antifreeze measures not only ensure stable operation of heat pump units and extend their service life, but also enhance the user experience and reduce maintenance costs, playing a significant role in promoting the widespread application of heat pump technology in cold regions. Summary of the Invention

[0005] To address the technical problem of heat pump units used in household cooling and heating integrated water systems, which are directly related to the family living environment and daily use, and have more stringent antifreeze performance requirements, an antifreeze control solution for heat pump units is urgently needed. This application provides an antifreeze control method, device, household unit, and storage medium. The specific technical solution is as follows:

[0006] In a first aspect, the present application provides an antifreeze control method, which is applied to a household unit, wherein the household unit includes a heat pump unit, a water inlet valve, a water outlet valve, and a water tank, wherein the water tank includes a water storage side and a water supply side, wherein the water outlet of the water storage side is connected to the first end of the water inlet valve, the water outlet of the water supply side is connected to the second end of the water inlet valve, the third end of the water inlet valve is connected to the water inlet of the heat pump unit, the water inlet of the water storage side is connected to the first end of the water outlet valve, the water inlet of the water supply side is connected to the second end of the water outlet valve, and the third end of the water outlet valve is connected to the water outlet of the heat pump unit. The method includes:

[0007] Obtaining a second ambient temperature and a second water inlet temperature and a second water outlet temperature of the heat pump unit;

[0008] Entering the antifreeze mode when the second ambient temperature, the second water inlet temperature, and the second water outlet temperature meet the preset antifreeze conditions;

[0009] In the antifreeze mode, the opening of the water inlet valve is adjusted according to the second water inlet temperature and the second water outlet temperature, so that water on the water storage side flows into the heat pump unit for antifreeze.

[0010] In an optional embodiment, the household unit further includes an inlet water temperature sensing package and an outlet water temperature sensing package, wherein the inlet water temperature sensing package is used to measure the inlet water temperature of the heat pump unit, and the outlet water temperature sensing package is used to measure the outlet water temperature of the heat pump unit;

[0011] The water outlet on the water supply side is connected to one end of the water inlet temperature sensing package, and the other end of the water inlet temperature sensing package is connected to the second end of the water inlet valve;

[0012] The water inlet on the water supply side is connected to one end of the outlet water temperature sensing package, and the other end of the outlet water temperature sensing package is connected to the second end of the outlet valve.

[0013] In an optional embodiment, the household unit further includes a first three-way valve and a second three-way valve;

[0014] The water outlet on the water supply side is connected to the first end of the first three-way valve, and the second end of the first three-way valve is connected to one end of the water inlet temperature sensing package;

[0015] The water inlet on the water supply side is connected to the first end of the second three-way valve, and the second end of the second three-way valve is connected to one end of the outlet water temperature sensing package;

[0016] The third end of the first three-way valve is connected to the third end of the second three-way valve.

[0017] In an optional embodiment, before executing the method, the method further includes:

[0018] Obtaining a first water inlet temperature and a first water outlet temperature of the heat pump unit, and determining a target temperature according to the first water inlet temperature and the first water outlet temperature;

[0019] When the target temperature is lower than the preset antifreeze warning temperature, the antifreeze warning mode is entered;

[0020] In the antifreeze warning mode, detecting whether the first ambient temperature within a preset first time period is less than a preset ambient temperature threshold;

[0021] When the first ambient temperature within the preset first time period is lower than the preset ambient temperature threshold, the opening of the water outlet valve is adjusted to allow part of the water at the water outlet of the heat pump unit to flow into the water storage side.

[0022] In an optional embodiment, determining the target temperature according to the first water inlet temperature and the first water outlet temperature includes:

[0023] The first water inlet temperature and the first water outlet temperature are compared, and the minimum value thereof is determined as the target temperature.

[0024] In an optional embodiment, adjusting the opening of the water outlet valve includes:

[0025] The opening of the water outlet valve is adjusted according to the first water outlet temperature and the first ambient temperature.

[0026] In an optional embodiment, adjusting the opening of the water outlet valve according to the first outlet water temperature and the first ambient temperature includes:

[0027] When the first outlet water temperature is within a preset antifreeze warning outlet water temperature range, determining a first opening value according to the first outlet water temperature;

[0028] When the first ambient temperature is within a preset antifreeze warning ambient temperature range, determining a second opening value according to the first ambient temperature;

[0029] The first opening value and the second opening value are superimposed to obtain a first superimposed opening value, and the opening of the water outlet valve is adjusted to the first superimposed opening value.

[0030] In an optional embodiment, determining the first opening value according to the first outlet water temperature includes:

[0031] Obtaining a first minimum temperature in a preset antifreeze warning water outlet temperature range, and obtaining a first temperature difference between the first water outlet temperature and the first minimum temperature;

[0032] An opening value corresponding to the first temperature difference is searched, and the opening value corresponding to the first temperature difference is determined as a first opening value.

[0033] In an optional embodiment, determining the second opening value according to the first ambient temperature includes:

[0034] Obtaining a second minimum temperature in a preset antifreeze warning ambient temperature range, and obtaining a second temperature difference between the first ambient temperature and the second minimum temperature;

[0035] The opening value corresponding to the second temperature difference is searched, and the opening value corresponding to the second temperature difference is determined as the second opening value.

[0036] In an optional embodiment, when the second ambient temperature, the second water inlet temperature, and the second water outlet temperature meet preset antifreeze conditions, entering the antifreeze mode includes:

[0037] When the second ambient temperature is lower than the preset ambient temperature threshold, and either the second water inlet temperature or the second water outlet temperature is lower than the preset antifreeze temperature, the antifreeze mode is entered.

[0038] In an optional embodiment, adjusting the opening of the water inlet valve according to the second water inlet temperature and the second water outlet temperature includes:

[0039] When the second water inlet temperature is within a preset antifreeze temperature range, determining a third opening value according to the second water inlet temperature;

[0040] When the second outlet water temperature is within a preset antifreeze temperature range, determining a fourth opening value according to the second outlet water temperature;

[0041] The third opening value and the fourth opening value are superimposed to obtain a second superimposed opening value, and the opening of the water inlet valve is adjusted to the second superimposed opening value.

[0042] In an optional embodiment, determining the third opening value according to the second water inlet temperature includes:

[0043] Obtaining a maximum temperature in a preset antifreeze temperature range, and obtaining a third temperature difference between the second water inlet temperature and the maximum temperature;

[0044] The opening value corresponding to the third temperature difference is searched, and the opening value corresponding to the third temperature difference is determined as the third opening value.

[0045] In an optional embodiment, determining the fourth opening value according to the second outlet water temperature includes:

[0046] Obtaining a maximum temperature in a preset antifreeze temperature range, and obtaining a fourth temperature difference between the second outlet water temperature and the maximum temperature;

[0047] The opening value corresponding to the fourth temperature difference is searched, and the opening value corresponding to the fourth temperature difference is determined as the fourth opening value.

[0048] In an optional embodiment, after adjusting the opening of the water inlet valve, the method further includes:

[0049] Detecting whether the third outlet water temperature within the preset second time period is within the preset antifreeze critical temperature range;

[0050] When the third outlet water temperature in the preset second time period is within the preset antifreeze critical temperature range, controlling the heat pump unit to operate in a heating mode;

[0051] When the fourth outlet water temperature in the preset third time period is greater than or equal to the preset antifreeze warning temperature, the heat pump unit is controlled to stop operating.

[0052] In an optional embodiment, the method further comprises:

[0053] When the fifth outlet water temperature and the fifth inlet water temperature within the preset fourth time period are both greater than the preset antifreeze warning temperature, the system enters the normal standby state;

[0054] When the fifth outlet water temperature and the fifth inlet water temperature in the preset fourth time period are both greater than the preset antifreeze temperature but both less than the preset antifreeze warning temperature, the antifreeze mode is exited and the antifreeze warning mode is entered;

[0055] If the fifth outlet water temperature and the fifth inlet water temperature within the preset fourth time period are lower than the preset antifreeze temperature but higher than or equal to the preset emergency antifreeze temperature, the process jumps to the step of controlling the heat pump unit to operate in the heating mode;

[0056] When the fifth outlet water temperature and the fifth inlet water temperature within the preset fourth time period are lower than the preset emergency antifreeze temperature, the emergency antifreeze mode is entered;

[0057] In the emergency antifreeze mode, close the first three-way valve and the water inlet valve, open the second three-way valve and the water outlet valve, and drain the water in the heat pump unit into the water tank until it is empty and exits the emergency antifreeze mode.

[0058] In a second aspect, the present application provides an antifreeze control device, which is applied to a household unit, the household unit including a heat pump unit, a water inlet valve, a water outlet valve, and a water tank, the water tank including a water storage side and a water supply side, the water outlet of the water storage side being connected to the first end of the water inlet valve, the water outlet of the water supply side being connected to the second end of the water inlet valve, the third end of the water inlet valve being connected to the water inlet of the heat pump unit, the water inlet of the water storage side being connected to the first end of the water outlet valve, the water inlet of the water supply side being connected to the second end of the water outlet valve, and the third end of the water outlet valve being connected to the water outlet of the heat pump unit, the device including:

[0059] A temperature acquisition module is used to acquire a second ambient temperature and a second water inlet temperature and a second water outlet temperature of the heat pump unit;

[0060] a mode entry module, configured to enter an antifreeze mode when the second ambient temperature, the second water inlet temperature, and the second water outlet temperature meet a preset antifreeze condition;

[0061] The antifreeze control module is used to adjust the opening of the water inlet valve according to the second water inlet temperature and the second water outlet temperature in the antifreeze mode, so that the water on the water storage side flows into the heat pump unit for antifreeze.

[0062] In a third aspect, a household machine is provided, comprising a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other via the communication bus;

[0063] Memory for storing computer programs;

[0064] The processor is used to implement any antifreeze control method described in the first aspect when executing the program stored in the memory.

[0065] In a fourth aspect, a storage medium is further provided, wherein instructions are stored in the storage medium, and when the storage medium is run on a computer, the computer executes any of the antifreeze control methods described in the first aspect.

[0066] In a fifth aspect, a computer program product comprising instructions is also provided, which, when run on a computer, enables the computer to execute any of the above-mentioned antifreeze control methods.

[0067] The above technical solution provided by the embodiment of the present application has the following advantages over the prior art: the antifreeze control method provided by the embodiment of the present application is applied to a household unit, which includes a heat pump unit, a water inlet valve, a water outlet valve, and a water tank. The water tank includes a water storage side and a water supply side. The water outlet of the water storage side is connected to the first end of the water inlet valve, the water outlet of the water supply side is connected to the second end of the water inlet valve, the third end of the water inlet valve is connected to the water inlet of the heat pump unit, and the water inlet of the water storage side is connected to the first end of the water outlet valve. The water inlet on the water supply side is connected to the second end of the water outlet valve, and the third end of the water outlet valve is connected to the water outlet of the heat pump unit, specifically including: obtaining the second ambient temperature and the second water inlet temperature and the second water outlet temperature of the heat pump unit, and entering the antifreeze mode when the second ambient temperature, the second water inlet temperature and the second water outlet temperature meet the preset antifreeze conditions. In the antifreeze mode, the opening of the water inlet valve is adjusted according to the second water inlet temperature and the second water outlet temperature to allow the water on the water storage side to flow into the heat pump unit for antifreeze.

[0068] In this way, in the antifreeze mode, the opening of the water inlet valve is adjusted according to the second water inlet temperature and the second water outlet temperature of the heat pump unit, so that the water on the water storage side flows into the heat pump unit for antifreeze. This can not only ensure the stable operation of the heat pump unit and extend the service life of the equipment, but also improve the user experience and reduce maintenance costs. It is of great significance to promote the widespread application of heat pump technology in cold areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0070] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0071] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0072] Figure 1 A schematic structural diagram of a household unit with a cooling and heating integrated water system provided in an embodiment of the present application;

[0073] Figure 2 A schematic diagram of an implementation flow of an antifreeze control method provided in an embodiment of the present application;

[0074] Figure 3 A schematic diagram of an implementation flow of another antifreeze control method provided in an embodiment of the present application;

[0075] Figure 4 A schematic diagram of an implementation flow of another antifreeze control method provided in an embodiment of the present application;

[0076] Figure 5 A schematic diagram of an implementation flow of another antifreeze control method provided in an embodiment of the present application;

[0077] Figure 6 A schematic structural diagram of an antifreeze control device provided in an embodiment of the present application;

[0078] Figure 7 A schematic structural diagram of a household machine provided in an embodiment of the present application. DETAILED DESCRIPTION

[0079] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0080] The disclosure below provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, these are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0081] like Figure 1 As shown, it is a structural schematic diagram of a household unit of a cooling and heating integrated water system provided in an embodiment of the present application. The household unit of the cooling and heating integrated water system includes a compressor 1, an exhaust temperature sensing package 2, a four-way valve 3, a fin-type heat exchanger 4, a first throttle valve 5, a second throttle valve 6, a shell and tube heat exchanger 7, a gas-liquid separator 8, a water flow switch 9, a water inlet valve 10 (or a hot water valve at the water inlet), a water inlet temperature sensing package 11, a first three-way valve 12 (or a water inlet three-way valve), a second three-way valve 13 (or a water outlet three-way valve), a water outlet temperature sensing package 14, a water outlet valve 15 (or a hot water valve at the water outlet), and a water tank.

[0082] Among them, the compressor 1, the exhaust temperature sensor 2, the four-way valve 3, the finned heat exchanger 4, the first throttle valve 5, the second throttle valve 6, the shell and tube heat exchanger 7, and the gas-liquid separator 8 form a loop. This loop is the heat pump unit. Specifically, the connection relationship between the compressor 1, the exhaust temperature sensor 2, the four-way valve 3, the finned heat exchanger 4, the first throttle valve 5, the second throttle valve 6, the shell and tube heat exchanger 7, and the gas-liquid separator 8 is as follows: Figure 1 shown.

[0083] The water tank is divided into a water storage side and a water supply side. The water outlet of the water storage side is connected to the first end of the water inlet valve 10, the water outlet of the water supply side is connected to the first end of the first three-way valve 12, the second end of the first three-way valve 12 is connected to one end of the water inlet temperature sensing package 11, the other end of the water inlet temperature sensing package 11 is connected to the second end of the water inlet valve 10, the third end of the water inlet valve 10 is connected to one end of the water flow switch 9, and the other end of the water flow switch 9 is connected to the water inlet of the shell and tube heat exchanger 7 in the heat pump unit, as shown in FIG. Figure 1 shown.

[0084] The water inlet on the water storage side is connected to the first end of the water outlet valve 15, the water inlet on the water supply side is connected to the first end of the second three-way valve 13, the second end of the second three-way valve 13 is connected to one end of the outlet water temperature sensing package 14, the other end of the outlet water temperature sensing package 14 is connected to the second end of the outlet valve 15, the third end of the outlet valve 15 is connected to the water outlet of the shell and tube heat exchanger 7 in the heat pump unit, and the third end of the first three-way valve 12 is connected to the third end of the second three-way valve 13. Figure 1 shown.

[0085] For the above-mentioned household unit with integrated heating and cooling water system, during normal use, the normal flow direction of water is water supply side → first three-way valve 12 → water inlet temperature sensor 11 → water inlet valve 10 → water flow switch 9 → shell and tube heat exchanger 7 → water outlet valve 15 → water outlet temperature sensor 14 → second three-way valve 13 → water supply side. In the case of antifreeze warning, the water outlet valve 15 will open, and part of the hot water will be stored in the water storage side. In the case of antifreeze, the water inlet valve 10 will open, and the hot water on the water storage side will flow into the shell and tube heat exchanger 7, which is used to solve the antifreeze problem of the shell and tube heat exchanger 7 in the heat pump unit.

[0086] Based on this, Figure 2 FIG. 1 is a schematic diagram of an implementation flow of an antifreeze control method provided in an embodiment of the present application. The method is applied to the above-mentioned household unit and may specifically include the following steps:

[0087] S201, obtaining a second ambient temperature and a second water inlet temperature and a second water outlet temperature of a heat pump unit.

[0088] In the embodiment of the present application, the second ambient temperature, as well as the second water inlet temperature and the second water outlet temperature of the heat pump unit are obtained, specifically the second water inlet temperature and the second water outlet temperature of the shell and tube heat exchanger 7 in the heat pump unit.

[0089] The second inlet water temperature is measured by the inlet water temperature sensing package 11, the second outlet water temperature is measured by the outlet water temperature sensing package 14, and the second ambient temperature is measured by the ambient temperature sensing package. The second ambient temperature here refers to the temperature of the environment where the heat pump unit is located.

[0090] S202 , entering an antifreeze mode when the second ambient temperature, the second water inlet temperature, and the second water outlet temperature meet a preset antifreeze condition.

[0091] In an embodiment of the present application, for the second ambient temperature, the second water inlet temperature, and the second water outlet temperature of the heat pump unit obtained above, it is determined whether the second ambient temperature, the second water inlet temperature, and the second water outlet temperature meet the preset antifreeze conditions.

[0092] When the second ambient temperature, the second water inlet temperature and the second water outlet temperature meet the preset antifreeze conditions, it means that the heat pump unit needs to be controlled for antifreeze. At this time, the antifreeze mode is entered. In the antifreeze mode, a series of operations will be performed to control the antifreeze of the heat pump unit.

[0093] S203, in the antifreeze mode, adjusting the opening of the water inlet valve according to the second water inlet temperature and the second water outlet temperature, so that the water on the water storage side flows into the heat pump unit for antifreeze.

[0094] In an embodiment of the present application, in the antifreeze mode, the opening of the water inlet valve 10 can be adjusted according to the second water inlet temperature and the second water outlet temperature of the heat pump unit, so that the hot water stored on the water storage side will flow into the heat pump unit for antifreeze, specifically into the shell and tube heat exchanger 7 in the heat pump unit. In this way, the hot water flowing into the shell and tube heat exchanger 7 in the heat pump unit will heat the water in the shell and tube heat exchanger 7 to prevent the shell and tube heat exchanger 7 from freezing.

[0095] It should be noted that, for the second water inlet temperature and the second water outlet temperature, the adjustment of the opening of the water inlet valve 10 by the two does not interfere with each other, and the two each control, for example, 0~25%, that is, the adjustment range of the opening of the water inlet valve 10 by each is 0~25%, and the embodiment of the present application does not limit this.

[0096] Through the above description of the technical solution provided in the embodiment of the present application, the second ambient temperature and the second water inlet temperature and the second water outlet temperature of the heat pump unit are obtained. When the second ambient temperature, the second water inlet temperature and the second water outlet temperature meet the preset antifreeze conditions, the antifreeze mode is entered. In the antifreeze mode, the opening of the water inlet valve is adjusted according to the second water inlet temperature and the second water outlet temperature to allow water on the water storage side to flow into the heat pump unit for antifreeze.

[0097] In this way, in the antifreeze mode, the opening of the water inlet valve is adjusted according to the second water inlet temperature and the second water outlet temperature of the heat pump unit, so that the water on the water storage side flows into the heat pump unit for antifreeze. This can not only ensure the stable operation of the heat pump unit and extend the service life of the equipment, but also improve the user experience and reduce maintenance costs. It is of great significance to promote the widespread application of heat pump technology in cold areas.

[0098] In addition, in the embodiment of the present application, the water storage side is part of the heated hot water stored in the heat pump unit through the outlet valve 15 when it is in the antifreeze warning state, which is used to heat the water temperature of the return water inlet pipe when it enters the antifreeze state. Therefore, it is necessary to open the outlet valve 15 in the antifreeze warning state, and part of the hot water is stored in the water storage side. In the antifreeze state, the water inlet valve 10 will be opened, and the hot water on the water storage side will flow into the shell and tube heat exchanger 7, which is used to solve the antifreeze problem of the shell and tube heat exchanger 7 in the heat pump unit.

[0099] Based on this, Figure 3 FIG. 1 is a schematic diagram of an implementation flow of another antifreeze control method provided in an embodiment of the present application. The method is applied to the above-mentioned household unit and may specifically include the following steps:

[0100] S301, obtaining a first water inlet temperature and a first water outlet temperature of a heat pump unit, and determining a target temperature according to the first water inlet temperature and the first water outlet temperature.

[0101] In the embodiment of the present application, a first water inlet temperature and a first water outlet temperature of the heat pump unit are obtained, wherein the first water inlet temperature is measured by the water inlet temperature sensing package 11 and the first water outlet temperature is measured by the water outlet temperature sensing package 14 .

[0102] The target temperature is determined based on the first inlet water temperature and the first outlet water temperature of the heat pump unit. The target temperature can be determined by comparing the first inlet water temperature and the first outlet water temperature.

[0103] Specifically, the first water inlet temperature and the first water outlet temperature of the heat pump unit are compared, and the minimum value thereof is determined as the target temperature, which means that the target temperature is the minimum value T between the first water inlet temperature and the first water outlet temperature.

[0104] S302: When the target temperature is lower than the preset antifreeze warning temperature, enter the antifreeze warning mode.

[0105] In an embodiment of the present application, for the target temperature, it is determined whether the target temperature is lower than the preset antifreeze warning temperature. If the target temperature is lower than the preset antifreeze warning temperature, the antifreeze warning mode is entered.

[0106] It should be noted that the preset antifreeze warning temperature refers to the lowest settable water temperature in each operating mode, such as Tcmin (7°C), which means judging whether the target temperature is less than 7°C. If so, the antifreeze warning mode is entered.

[0107] S303, in the antifreeze warning mode, detecting whether the first ambient temperature in a preset first time period is lower than a preset ambient temperature threshold.

[0108] In an embodiment of the present application, in the antifreeze warning mode, it is detected whether the first ambient temperature in a preset first time period is less than a preset ambient temperature threshold, where the preset ambient temperature threshold is, for example, 0°C.

[0109] For example, in the antifreeze warning mode, it is determined whether the inner ring temperature of ΔT1 is in a low temperature environment, that is, whether it is below 0°C.

[0110] S304: When the first ambient temperature in the preset first time period is lower than the preset ambient temperature threshold, adjust the opening of the water outlet valve to allow part of the water at the water outlet of the heat pump unit to flow into the water storage side.

[0111] In an embodiment of the present application, when the first ambient temperature within the preset first time period is lower than the preset ambient temperature threshold, for example, the ambient temperature within ΔT1 is below 0°C, it is necessary to adjust the opening of the water outlet valve to allow part of the hot water at the water outlet of the heat pump unit to flow into the water storage side of the water tank.

[0112] The adjustment of the outlet valve opening is affected by the outlet water temperature sensor and the ambient temperature sensor. When the outlet water temperature sensor detects a temperature T that satisfies, for example, 7°C > Toutwater ≥ 5°C, the outlet valve opening adjustment range is 0-30%. The lower the detection temperature T, the lower the outlet valve opening. When the ambient temperature sensor detects a temperature Tenvironment that satisfies, for example, 0°C > Tenvironment ≥ -25°C, the outlet valve opening adjustment range is 0-20%. The lower the detection temperature Tring, the greater the outlet valve opening. The two do not interfere with each other's adjustment of the opening value, that is, the maximum outlet valve opening in the antifreeze warning mode is 50%.

[0113] Based on this, the opening of the water outlet valve can be adjusted according to the first outlet water temperature and the first ambient temperature, and the two do not interfere with each other in adjusting the opening of the water outlet valve.

[0114] To this end, when the first outlet water temperature is within the preset antifreeze warning outlet water temperature range, the first opening value is determined according to the first outlet water temperature; when the first ambient temperature is within the preset antifreeze warning ambient temperature range, the second opening value is determined according to the first ambient temperature; the first opening value and the second opening value are superimposed to obtain a first superimposed opening value, and the opening of the outlet valve is adjusted to the first superimposed opening value.

[0115] For example, the preset antifreeze warning water outlet temperature range is 7℃>Toutwater≥5℃. When the first water outlet temperature is within the preset antifreeze warning water outlet temperature range, the first opening value is determined according to the first water outlet temperature. The preset antifreeze warning ambient temperature range is 0℃>Tring≥-25℃. When the first ambient temperature is within the preset antifreeze warning ambient temperature range, the second opening value is determined according to the first ambient temperature. The first opening value and the second opening value are superimposed to obtain a first superimposed opening value, and the opening of the outlet valve is adjusted to the first superimposed opening value.

[0116] Among them, to determine the first opening value, the first minimum temperature in the preset antifreeze warning water outlet temperature range can be obtained, the first temperature difference between the first water outlet temperature and the first minimum temperature can be obtained, the opening value corresponding to the first temperature difference can be found, and the opening value corresponding to the first temperature difference can be determined as the first opening value.

[0117] For example, the preset antifreeze warning water outlet temperature range is 7°C>Toutwater≥5°C, then obtain the first minimum temperature 5°C in the preset antifreeze warning water outlet temperature range, obtain the first temperature difference X1=Toutwater-5 between the first water outlet temperature and the first minimum temperature, find the opening value corresponding to the first temperature difference, and determine the opening value corresponding to the first temperature difference as the first opening value.

[0118] In addition, to determine the second opening value, the second minimum temperature in the preset antifreeze warning ambient temperature range can be obtained, the second temperature difference between the first ambient temperature and the second minimum temperature can be obtained, the opening value corresponding to the second temperature difference can be found, and the opening value corresponding to the second temperature difference can be determined as the second opening value.

[0119] For example, the preset antifreeze warning ambient temperature range is 0°C>Tring≥-25°C, the second minimum temperature -25°C in the preset antifreeze warning ambient temperature range is obtained, the second temperature difference Y1=Tring-(-25) between the first ambient temperature and the second minimum temperature is obtained, the opening value corresponding to the second temperature difference is found, and the opening value corresponding to the second temperature difference is determined as the second opening value.

[0120] S305: Acquire a second ambient temperature and a second water inlet temperature and a second water outlet temperature of the heat pump unit.

[0121] In the embodiment of the present application, after a series of operations in the above-mentioned antifreeze warning mode, the second ambient temperature and the second water inlet temperature and the second water outlet temperature of the heat pump unit are then obtained.

[0122] The second inlet water temperature is measured by the inlet water temperature sensing package 11, the second outlet water temperature is measured by the outlet water temperature sensing package 14, and the second ambient temperature is measured by the ambient temperature sensing package. The second ambient temperature here refers to the temperature of the environment where the heat pump unit is located.

[0123] S306 , entering an antifreeze mode when the second ambient temperature, the second water inlet temperature, and the second water outlet temperature meet a preset antifreeze condition.

[0124] In an embodiment of the present application, for the second ambient temperature and the second water inlet temperature and second water outlet temperature of the heat pump unit obtained in the above steps, the antifreeze mode is entered when the second ambient temperature, the second water inlet temperature and the second water outlet temperature meet the preset antifreeze conditions.

[0125] Specifically, when the second ambient temperature is lower than the preset ambient temperature threshold, and either the second water inlet temperature or the second water outlet temperature is lower than the preset antifreeze temperature, the antifreeze mode is entered.

[0126] For example, when the second ambient temperature is less than 0° C. and either the second water inlet temperature or the second water outlet temperature is less than 5° C., the antifreeze mode is entered.

[0127] S307, in the antifreeze mode, adjusting the opening of the water inlet valve according to the second water inlet temperature and the second water outlet temperature, so that the water on the water storage side flows into the heat pump unit for antifreeze.

[0128] In an embodiment of the present application, in the antifreeze mode, the heat pump unit needs to be antifreeze. To this end, the opening of the water inlet valve is adjusted according to the second water inlet temperature and the second water outlet temperature so that hot water on the water storage side flows into the heat pump unit for antifreeze.

[0129] When the inlet water temperature sensor detects a temperature, Twaterin, that satisfies, for example, 5°C > Twaterin > 3°C, the inlet valve opens to a certain degree. This degree of opening is influenced by Twaterin and Twaterout, each controlled between 0 and 25%. A lower Twaterin requires more hot water to be added, leading to a larger opening. A lower Twaterout results in too much water entering the water storage side of the tank, causing the water temperature to drop further, leading to a smaller opening.

[0130] Based on this, when the second water inlet temperature is within the preset antifreeze temperature range, the third opening value is determined according to the second water inlet temperature, and when the second water outlet temperature is within the preset antifreeze temperature range, the fourth opening value is determined according to the second water outlet temperature. The third opening value and the fourth opening value are superimposed to obtain a second superimposed opening value, and the opening of the water inlet valve is adjusted to the second superimposed opening value.

[0131] For example, the preset antifreeze temperature range is 5°C > Twater inlet / Twater outlet > 3°C. When the second water inlet temperature is within the preset antifreeze temperature range, the third opening value is determined based on the second water inlet temperature. When the second water outlet temperature is within the preset antifreeze temperature range, the fourth opening value is determined based on the second water outlet temperature. The third opening value and the fourth opening value are superimposed to obtain a second superimposed opening value, and the opening of the water inlet valve is adjusted to the second superimposed opening value.

[0132] Among them, for determining the third opening value, the maximum temperature in the preset antifreeze temperature range is obtained, the third temperature difference between the second water inlet temperature and the maximum temperature is obtained, the opening value corresponding to the third temperature difference is found, and the opening value corresponding to the third temperature difference is determined as the third opening value.

[0133] For example, the preset antifreeze temperature range is 5°C > Twater inlet / Twater outlet > 3°C, the maximum temperature 5°C in the preset antifreeze temperature range is obtained, the third temperature difference X2 = Twater inlet - 5 between the second water inlet temperature and the maximum temperature is obtained, the opening value corresponding to the third temperature difference is found, and the opening value corresponding to the third temperature difference is determined as the third opening value.

[0134] To determine the fourth opening value, you can obtain the maximum temperature in the preset antifreeze temperature range, obtain the fourth temperature difference between the second water outlet temperature and the maximum temperature, find the opening value corresponding to the fourth temperature difference, and determine the opening value corresponding to the fourth temperature difference as the fourth opening value.

[0135] For example, the preset antifreeze temperature range is 5°C > Twater inlet / Twater outlet > 3°C, the maximum temperature 5°C in the preset antifreeze temperature range is obtained, the fourth temperature difference Y2 = Twater outlet - 5 between the second water outlet temperature and the maximum temperature is obtained, the opening value corresponding to the fourth temperature difference is found, and the opening value corresponding to the fourth temperature difference is determined as the fourth opening value.

[0136] In addition, in an embodiment of the present application, after the above-mentioned adjustment of the opening of the water inlet valve, it is detected whether the third water outlet temperature within the preset second time period is within the preset antifreeze critical temperature range. When the third water outlet temperature within the preset second time period is within the preset antifreeze critical temperature range, the heat pump unit is controlled to operate in heating mode. When the fourth water outlet temperature within the preset third time period is greater than or equal to the preset antifreeze warning temperature, the heat pump unit is controlled to stop operating.

[0137] For example, if Toutwater is less than 4°C and not less than 3°C within ΔT2, it indicates that neither the water circulation nor the return water can meet the water temperature increase requirements, and antifreeze is terminated. At this time, the heat pump unit is controlled to operate in heating mode with specific parameters until Toutwater ≥ 7°C. If Toutwater remains greater than 7°C within ΔT3, the heat pump unit stops operating.

[0138] In addition, when the heat pump unit stops running, if the fifth outlet water temperature and the fifth inlet water temperature in the preset fourth time period are both greater than the preset antifreeze warning temperature, the unit enters the normal standby state; if the fifth outlet water temperature and the fifth inlet water temperature in the preset fourth time period are both greater than the preset antifreeze temperature, but both are less than the preset antifreeze warning temperature, the unit exits the antifreeze mode and enters the antifreeze warning mode; if the fifth outlet water temperature and the fifth inlet water temperature in the preset fourth time period are less than the preset antifreeze temperature, but greater than or equal to the preset emergency antifreeze temperature, the unit jumps to the step of controlling the heat pump unit to operate in the heating mode; if the fifth outlet water temperature and the fifth inlet water temperature in the preset fourth time period are less than the preset emergency antifreeze temperature, the unit enters the emergency antifreeze mode. In the emergency antifreeze mode, the first three-way valve and the water inlet valve are closed, and the second three-way valve and the water outlet valve are opened to drain the water in the heat pump unit into the water tank until it is emptied and exits the emergency antifreeze mode.

[0139] For example, if both T inlet and T outlet temperatures remain above 5°C and below 7°C within ΔT4, antifreeze mode exits and returns to antifreeze warning mode. If both T inlet and T outlet temperatures remain above 7°C within ΔT4, the system returns to normal standby mode. If both T inlet and T outlet temperatures remain below 5°C and above 3°C within ΔT4, the system jumps to the step of controlling the heat pump unit to operate in heating mode. If both T inlet and T outlet temperatures quickly drop below 3°C within ΔT4, emergency antifreeze mode is entered. In emergency antifreeze mode, the first three-way valve closes, and the water inlet valve closes. The second three-way valve opens, and the water outlet valve opens. Water in the casing is drained to the water tank. Emergency antifreeze mode exits when the water flow switch detects no water flow.

[0140] The antifreeze control method provided by the embodiment of the present application is described below with reference to specific embodiments. Figure 4 As shown, the specific steps include:

[0141] Install appropriate temperature sensors at the inlet and outlet of the heat pump unit's double-tube heat exchanger to monitor real-time water temperature. Install a three-way valve at the connection between the water inlet and the user-side water tank to connect the two. Install a three-way valve at the connection between the water outlet and the user-side water tank to connect the two. Pipelines connect the two three-way valves. Install a hot water valve after the inlet temperature sensor and connect it to the water storage outlet of the water tank. Install a hot water valve after the outlet temperature sensor and connect it to the water storage inlet of the water tank. The user-side water tank is divided into a supply side and a storage side. The supply side supplies hot water generated by the heat pump unit during normal operation to the user. The storage side stores some of the heated hot water stored by the unit through the hot water valve during antifreeze warnings. This hot water is then used to heat the return water inlet pipe when antifreeze warnings are in effect.

[0142] The heat pump unit detects the temperature of the inlet and outlet water temperature sensors. When the minimum value T of the two water temperatures is less than the lowest settable water temperature Tcmin (7°C) in each operating mode, it enters the anti-freeze warning mode.

[0143] In antifreeze warning mode, the internal temperature of ΔT1 is checked to see if it is low, that is, below 0°C. If so, the outlet hot water valve on the heat pump unit's casing is adjusted to allow some hot water from the outlet pipe to flow into the water storage side of the tank. The outlet hot water valve's adjustment is affected by the temperature detected by the outlet water temperature sensor and the ambient temperature sensor. When the outlet water temperature sensor measures 7°C > T≥5°C, the valve adjustment range is 0-30%, with the valve opening decreasing as the water temperature drops. When the ambient temperature sensor measures 0°C > T≥-25°C, the valve adjustment range is 0-20%, with the valve opening increasing as the temperature drops. The two valve adjustments do not interfere with each other; that is, the maximum valve opening of the outlet hot water valve in antifreeze warning mode is 50%.

[0144] When the ambient temperature is below 0℃ and the inlet and outlet water temperature sensors detect that the water temperature T is less than 5℃, the system enters the antifreeze mode.

[0145] In antifreeze mode: when the inlet water temperature sensor detects 5℃>Tinwater>3℃, the hot water valve at the water inlet opens to a certain degree. The valve degree is affected by Tinwater and Toutwater, and both are controlled at 0~25%. The lower the Tinwater, the more hot water needs to be added, and the larger the valve value is; the lower the Toutwater, the more water enters the water storage side of the water tank, which will only cause the water temperature to become lower and lower, and the valve value is closed. When Toutwater is less than 4℃ and not lower than 3℃ within ΔT2, it means that the water circulation and return water cannot meet the requirements of the water temperature increase and the antifreeze function is exited. At this time, if Figure 5 As shown, the unit enters heating mode, operating within specified parameters until Toutwater ≥ 7°C. If Toutwater remains above 7°C for ΔT3, the unit stops. Meanwhile, if both Tinwater and Toutwater remain above 5°C for ΔT4, the unit exits antifreeze mode and returns to antifreeze warning mode. If both Tinwater and Toutwater remain above 7°C for ΔT4, the unit returns to normal standby mode. If both Tinwater and Toutwater quickly drop below 3°C within ΔT4, the unit enters emergency antifreeze mode.

[0146] In emergency antifreeze mode: Close the water inlet three-way valve and the hot water valve on the inlet side. Open the water outlet three-way valve and the hot water valve on the outlet side. Drain the water in the casing into the water tank. Exit emergency antifreeze mode when the water flow switch detects no water flow.

[0147] Adjustment is facilitated by installing devices in the heat pump unit and water tank. The user-side water tank is divided into two sections: a water storage side for storing and supplying hot water, and a water supply side for supplying water to users during normal operation of the unit. Temperature detection adjusts the opening of the hot water valve to ensure automatic anti-freeze protection when the water temperature in the unit is sufficient. If the unit encounters extreme weather and the heating system cannot meet the hot water supply, the various water valves can be adjusted to quickly drain the water from the unit's casing to prevent freezing.

[0148] Corresponding to the above method embodiment, the embodiment of the present application also provides an antifreeze control device, such as Figure 6 As shown, it is applied to a household machine, which includes a heat pump unit, a water inlet valve, a water outlet valve, and a water tank. The water tank includes a water storage side and a water supply side. The water outlet of the water storage side is connected to the first end of the water inlet valve, the water outlet of the water supply side is connected to the second end of the water inlet valve, the third end of the water inlet valve is connected to the water inlet of the heat pump unit, the water inlet of the water storage side is connected to the first end of the water outlet valve, the water inlet of the water supply side is connected to the second end of the water outlet valve, and the third end of the water outlet valve is connected to the water outlet of the heat pump unit. The device may include: a temperature acquisition module 610, a mode entry module 620, and an antifreeze control module 630.

[0149] The temperature acquisition module 610 is used to acquire the second ambient temperature and the second water inlet temperature and the second water outlet temperature of the heat pump unit;

[0150] A mode entry module 620 is configured to enter an antifreeze mode when the second ambient temperature, the second water inlet temperature, and the second water outlet temperature meet a preset antifreeze condition;

[0151] The antifreeze control module 630 is used to adjust the opening of the water inlet valve according to the second water inlet temperature and the second water outlet temperature in the antifreeze mode, so that water on the water storage side flows into the heat pump unit for antifreeze.

[0152] The present application also provides a household machine, such as Figure 7 As shown, it includes a processor 71, a communication interface 72, a memory 73 and a communication bus 74, wherein the processor 71, the communication interface 72, and the memory 73 communicate with each other through the communication bus 74.

[0153] Memory 73, for storing computer programs;

[0154] The processor 71 is configured to execute the program stored in the memory 73 to implement the following steps:

[0155] Obtain a second ambient temperature and a second water inlet temperature and a second water outlet temperature of the heat pump unit; enter an antifreeze mode when the second ambient temperature, the second water inlet temperature and the second water outlet temperature meet preset antifreeze conditions; in the antifreeze mode, adjust the opening of the water inlet valve according to the second water inlet temperature and the second water outlet temperature so that water on the water storage side flows into the heat pump unit for antifreeze.

[0156] The communication bus mentioned in the above-mentioned household computer can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. This communication bus can be divided into address buses, data buses, control buses, etc. For ease of illustration, only one thick line is used in the figure, but this does not mean that there is only one bus or only one type of bus.

[0157] The communication interface is used for communication between the above household machine and other devices.

[0158] The memory may include random access memory (RAM) or non-volatile memory, such as at least one disk storage. Alternatively, the memory may be at least one storage device located away from the processor.

[0159] The above-mentioned processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, and discrete hardware components.

[0160] In another embodiment provided in the present application, a storage medium is further provided, in which instructions are stored. When the storage medium is run on a computer, the computer is enabled to execute the antifreeze control method described in any one of the above embodiments.

[0161] In another embodiment provided in the present application, a computer program product including instructions is also provided, which, when executed on a computer, enables the computer to execute the antifreeze control method described in any one of the above embodiments.

[0162] In the above embodiments, all or part of the embodiments can be implemented using software, hardware, firmware, or any combination thereof. When implemented using software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a storage medium or transmitted from one storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more available media. The available medium can be a magnetic medium (e.g., a floppy disk, hard disk, tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)).

[0163] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0164] Each embodiment in this specification is described in a related manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the system embodiment is generally similar to the method embodiment, so the description is relatively simple. For related parts, refer to the description of the method embodiment.

[0165] The above description is only a preferred embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the scope of protection of the present application.

Claims

1. An antifreeze control method, characterized in that: Applicable to a household unit, the household unit includes a heat pump unit, a water inlet valve, a water outlet valve, and a water tank, the water tank includes a water storage side and a water supply side, the water outlet of the water storage side is connected to the first end of the water inlet valve, the water outlet of the water supply side is connected to the second end of the water inlet valve, the third end of the water inlet valve is connected to the water inlet of the heat pump unit, the water inlet of the water storage side is connected to the first end of the water outlet valve, the water inlet of the water supply side is connected to the second end of the water outlet valve, and the third end of the water outlet valve is connected to the water outlet of the heat pump unit, the method includes: Obtaining a first water inlet temperature and a first water outlet temperature of the heat pump unit, and determining a target temperature based on the first water inlet temperature and the first water outlet temperature; entering an antifreeze warning mode when the target temperature is lower than a preset antifreeze warning temperature; in the antifreeze warning mode, detecting whether a first ambient temperature within a preset first time period is lower than a preset ambient temperature threshold; and adjusting an opening of a water outlet valve when the first ambient temperature within the preset first time period is lower than the preset ambient temperature threshold, so that part of the water at the water outlet of the heat pump unit flows into the water storage side; Obtaining a second ambient temperature and a second water inlet temperature and a second water outlet temperature of the heat pump unit; Entering the antifreeze mode when the second ambient temperature, the second water inlet temperature, and the second water outlet temperature meet the preset antifreeze conditions; In the antifreeze mode, the opening of the water inlet valve is adjusted according to the second water inlet temperature and the second water outlet temperature, so that water on the water storage side flows into the heat pump unit for antifreeze.

2. The method according to claim 1, characterized in that The household unit also includes an inlet water temperature sensing package and an outlet water temperature sensing package. The inlet water temperature sensing package is used to measure the inlet water temperature of the heat pump unit, and the outlet water temperature sensing package is used to measure the outlet water temperature of the heat pump unit. The water outlet on the water supply side is connected to one end of the water inlet temperature sensing package, and the other end of the water inlet temperature sensing package is connected to the second end of the water inlet valve; The water inlet on the water supply side is connected to one end of the outlet water temperature sensing package, and the other end of the outlet water temperature sensing package is connected to the second end of the outlet valve.

3. The method according to claim 2, characterized in that The household machine also includes a first three-way valve and a second three-way valve; The water outlet on the water supply side is connected to the first end of the first three-way valve, and the second end of the first three-way valve is connected to one end of the water inlet temperature sensing package; The water inlet on the water supply side is connected to the first end of the second three-way valve, and the second end of the second three-way valve is connected to one end of the outlet water temperature sensing package; The third end of the first three-way valve is connected to the third end of the second three-way valve.

4. The method according to claim 1, wherein The determining the target temperature according to the first water inlet temperature and the first water outlet temperature includes: The first water inlet temperature and the first water outlet temperature are compared, and the minimum value thereof is determined as the target temperature.

5. The method according to claim 1, wherein The adjusting the opening of the water outlet valve comprises: The opening of the water outlet valve is adjusted according to the first water outlet temperature and the first ambient temperature.

6. The method according to claim 5, characterized in that The adjusting the opening of the water outlet valve according to the first water outlet temperature and the first ambient temperature includes: When the first outlet water temperature is within a preset antifreeze warning outlet water temperature range, determining a first opening value according to the first outlet water temperature; When the first ambient temperature is within a preset antifreeze warning ambient temperature range, determining a second opening value according to the first ambient temperature; The first opening value and the second opening value are superimposed to obtain a first superimposed opening value, and the opening of the water outlet valve is adjusted to the first superimposed opening value.

7. The method according to claim 6, characterized in that Determining a first opening value according to the first outlet water temperature includes: Obtaining a first minimum temperature in a preset antifreeze warning water outlet temperature range, and obtaining a first temperature difference between the first water outlet temperature and the first minimum temperature; An opening value corresponding to the first temperature difference is searched, and the opening value corresponding to the first temperature difference is determined as a first opening value.

8. The method according to claim 6, characterized in that The determining of the second opening value according to the first ambient temperature includes: Obtaining a second minimum temperature in a preset antifreeze warning ambient temperature range, and obtaining a second temperature difference between the first ambient temperature and the second minimum temperature; The opening value corresponding to the second temperature difference is searched, and the opening value corresponding to the second temperature difference is determined as the second opening value.

9. The method according to claim 1, characterized in that The step of entering the antifreeze mode when the second ambient temperature, the second water inlet temperature, and the second water outlet temperature meet a preset antifreeze condition includes: When the second ambient temperature is lower than the preset ambient temperature threshold, and either the second water inlet temperature or the second water outlet temperature is lower than the preset antifreeze temperature, the antifreeze mode is entered.

10. The method according to claim 1, characterized in that The adjusting the opening of the water inlet valve according to the second water inlet temperature and the second water outlet temperature includes: When the second water inlet temperature is within a preset antifreeze temperature range, determining a third opening value according to the second water inlet temperature; When the second outlet water temperature is within a preset antifreeze temperature range, determining a fourth opening value according to the second outlet water temperature; The third opening value and the fourth opening value are superimposed to obtain a second superimposed opening value, and the opening of the water inlet valve is adjusted to the second superimposed opening value.

11. The method according to claim 10, characterized in that Determining the third opening value according to the second water inlet temperature includes: Obtaining a maximum temperature in a preset antifreeze temperature range, and obtaining a third temperature difference between the second water inlet temperature and the maximum temperature; The opening value corresponding to the third temperature difference is searched, and the opening value corresponding to the third temperature difference is determined as the third opening value.

12. The method according to claim 10, characterized in that Determining the fourth opening value according to the second outlet water temperature includes: Obtaining a maximum temperature in a preset antifreeze temperature range, and obtaining a fourth temperature difference between the second outlet water temperature and the maximum temperature; The opening value corresponding to the fourth temperature difference is searched, and the opening value corresponding to the fourth temperature difference is determined as the fourth opening value.

13. The method according to claim 1, wherein After adjusting the opening of the water inlet valve, the method further includes: Detecting whether the third outlet water temperature within the preset second time period is within the preset antifreeze critical temperature range; When the third outlet water temperature in the preset second time period is within the preset antifreeze critical temperature range, controlling the heat pump unit to operate in a heating mode; When the fourth outlet water temperature in the preset third time period is greater than or equal to the preset antifreeze warning temperature, the heat pump unit is controlled to stop operating.

14. The method according to claim 13, characterized in that The method further comprises: When the fifth outlet water temperature and the fifth inlet water temperature within the preset fourth time period are both greater than the preset antifreeze warning temperature, the system enters the normal standby state; When the fifth outlet water temperature and the fifth inlet water temperature in the preset fourth time period are both greater than the preset antifreeze temperature but both less than the preset antifreeze warning temperature, the antifreeze mode is exited and the antifreeze warning mode is entered; If the fifth outlet water temperature and the fifth inlet water temperature within the preset fourth time period are lower than the preset antifreeze temperature but higher than or equal to the preset emergency antifreeze temperature, the process jumps to the step of controlling the heat pump unit to operate in the heating mode; When the fifth outlet water temperature and the fifth inlet water temperature within the preset fourth time period are lower than the preset emergency antifreeze temperature, the emergency antifreeze mode is entered; In the emergency antifreeze mode, close the first three-way valve and the water inlet valve, open the second three-way valve and the water outlet valve, and drain the water in the heat pump unit into the water tank until it is empty and exits the emergency antifreeze mode.

15. An antifreeze control device, characterized in that: Applicable to household units, the household unit includes a heat pump unit, a water inlet valve, a water outlet valve, and a water tank. The water tank includes a water storage side and a water supply side. The water outlet of the water storage side is connected to the first end of the water inlet valve, the water outlet of the water supply side is connected to the second end of the water inlet valve, the third end of the water inlet valve is connected to the water inlet of the heat pump unit, the water inlet of the water storage side is connected to the first end of the water outlet valve, the water inlet of the water supply side is connected to the second end of the water outlet valve, and the third end of the water outlet valve is connected to the water outlet of the heat pump unit. The device includes: Obtaining a first water inlet temperature and a first water outlet temperature of the heat pump unit, and determining a target temperature based on the first water inlet temperature and the first water outlet temperature; entering an antifreeze warning mode when the target temperature is lower than a preset antifreeze warning temperature; in the antifreeze warning mode, detecting whether a first ambient temperature within a preset first time period is lower than a preset ambient temperature threshold; and adjusting an opening of a water outlet valve when the first ambient temperature within the preset first time period is lower than the preset ambient temperature threshold, so that part of the water at the water outlet of the heat pump unit flows into the water storage side; A temperature acquisition module is used to acquire a second ambient temperature and a second water inlet temperature and a second water outlet temperature of the heat pump unit; a mode entry module, configured to enter an antifreeze mode when the second ambient temperature, the second water inlet temperature, and the second water outlet temperature meet a preset antifreeze condition; The antifreeze control module is used to adjust the opening of the water inlet valve according to the second water inlet temperature and the second water outlet temperature in the antifreeze mode, so that the water on the water storage side flows into the heat pump unit for antifreeze.

16. A household machine, characterized in that: It includes a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus; Memory for storing computer programs; A processor, configured to implement the method according to any one of claims 1 to 14 when executing a program stored in a memory.

17. A storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 14 is implemented.

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