Air conditioning system with water heating function and control method thereof

Abstract

The invention relates to an air conditioning system with a water heating function and a control method of the air conditioning system. The air conditioning system comprises a compressor, a four-way valve, an indoor unit evaporator, an outdoor unit condenser, two expansion valves, a water tank and a one-way valve; the air conditioning system can execute various working modes such as refrigeration and water heating and single water heating, and the problem that in the prior art, direct emission of waste heat of an air conditioner causes large resource waste is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioning system with a water heating function and a control method thereof. Background Art

[0002] In today's society, with rapid economic development and significantly improved quality of life, families are increasingly pursuing a comfortable and convenient living environment. Air conditioners and water heaters are two indispensable appliances in modern homes, responsible for regulating indoor climate and supplying hot water. However, traditional household air source water heaters and air conditioning systems often follow their own independent design and operation modes. Although this separate deployment method can meet basic needs, it also brings unnecessary installation complexity and space occupation problems, posing a challenge to household resource management.

[0003] It is particularly noteworthy that when the air conditioning system performs cooling operations in summer or transitional seasons, a large amount of byproducts - waste heat - will be generated. If this heat can be effectively recycled, it will greatly alleviate the dependence of water heaters on additional energy and achieve efficient energy circulation. At present, the emission of waste heat from air conditioning is astonishing, about 130% of the cooling capacity, which not only constitutes a huge loss of resources, but also becomes a direct source of environmental thermal pollution when it is released into the atmosphere without restraint, exacerbating the urban "heat island effect" and posing a potential threat to the ecological balance and residents' health. Summary of the invention

[0004] The main purpose of the present invention is to provide an air conditioning system with a water heating function and a control method thereof, so as to solve the problem in the prior art that direct discharge of air conditioning waste heat causes a large waste of resources.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided an air-conditioning system with a water heating function, comprising: a compressor, a four-way valve, an indoor evaporator, an outdoor condenser, a first expansion valve, a second expansion valve, a water tank and a one-way valve, wherein the outlet end of the compressor is connected to the first end of the four-way valve and the first end of the water tank, the inlet end of the compressor is connected to the second end of the four-way valve, the first end of the indoor evaporator is connected to the third end of the four-way valve, the first end of the outdoor condenser is connected to the fourth end of the four-way valve, any two of the second end of the indoor evaporator, the second end of the outdoor condenser and the second end of the water tank are connected, the first expansion valve is arranged at the second end of the water tank, the second expansion valve is arranged at the second end of the indoor evaporator, and the one-way valve is arranged at the second end of the water tank; wherein the first end of the four-way valve, the first end of the water tank and the second end of the outdoor condenser can be set to be on and off to control the air-conditioning system to execute multiple working modes, and the multiple working modes at least include a cooling and water heating mode and a water heating mode only.

[0006] Furthermore, the air-conditioning system includes: a first control valve, which is arranged at the first end of the four-way valve to control the on-off of the first end of the four-way valve; a second control valve, which is arranged at the first end of the water tank to control the on-off of the first end of the water tank; and a third control valve, which is arranged at the second end of the outdoor unit condenser to control the on-off of the second end of the outdoor unit condenser.

[0007] Furthermore, when the air-conditioning system is in the cooling and water heating mode, the first control valve is opened, the second control valve is opened, the third control valve is opened, the first end and the fourth end of the four-way valve are connected, and the second end and the third end of the four-way valve are connected; when the air-conditioning system is in the water heating mode only, the first control valve is closed, the second control valve is opened, the third control valve is opened, the second end and the fourth end of the four-way valve are connected, and the indoor evaporator and the second expansion valve do not work.

[0008] Furthermore, the air-conditioning system includes a cooling only mode. When the air-conditioning system is in the cooling only mode, the first control valve is opened, the second control valve is closed, the third control valve is opened, the first end and the fourth end of the four-way valve are connected, and the second end and the third end of the four-way valve are connected.

[0009] Furthermore, the air-conditioning system includes a heating only mode. When the air-conditioning system is in the heating only mode, the first control valve is opened, the second control valve is closed, the third control valve is opened, the first end and the third end of the four-way valve are connected, and the second end and the fourth end of the four-way valve are connected.

[0010] Furthermore, the air-conditioning system includes heating and water heating modes. When the air-conditioning system is in the heating and water heating mode, the first control valve is opened, the second control valve is opened, the third control valve is opened, the first end and the third end of the four-way valve are connected, and the second end and the fourth end of the four-way valve are connected.

[0011] According to another aspect of the present invention, an air conditioning system control method is provided, which is applicable to the above-mentioned air conditioning system. The air conditioning system control method includes: controlling the air conditioning system to start up, when the hot water preparation economic mode is turned on, obtaining the usage time of multiple working modes within a predetermined number of days before the current date, calculating the actual ratio X1 of the usage time of the cooling and heating water modes and the usage time of the heating water mode alone, and comparing the actual ratio X1 with the set ratio X; if X1<X, then obtaining the temperature of the outdoor environment for each day within the predetermined number of days before the current date, finding the temperature data of the highest temperature range of each day in the outdoor environment, and calculating the indoor temperature within the predetermined number of days before the current date. The average temperature A1℃ of the highest temperature range of each day in the outdoor environment is compared with the first preset temperature A℃; if A1℃≥A℃, the first real-time temperature A2℃ of the outdoor environment is detected at the time corresponding to the start time of the highest temperature range on the next day, and the first real-time temperature A2℃ is compared with the first preset temperature A℃; if A2℃≥A℃, the actual water temperature Tw in the water tank during the current period is detected, and the actual water temperature Tw is compared with the target water temperature T1; if Tw<T1, the air-conditioning system is controlled to enter the single heating water mode, and after the actual water temperature Tw reaches the target water temperature T1, the air-conditioning system is controlled to turn on the water tank insulation mode.

[0012] Furthermore, the air-conditioning system control method includes: if X1≥X, controlling the air-conditioning system to standby, and then operating according to the working mode selected by the user; and / or if A1℃<A℃, controlling the air-conditioning system to standby, and then operating according to the working mode selected by the user; and / or if Tw≥T1, controlling the air-conditioning system to standby, and then operating according to the working mode selected by the user.

[0013] Furthermore, the air-conditioning system control method includes: if A1℃<A℃ or A2℃<A℃, then obtaining the low-power consumption period in the area where the water tank is located, and detecting whether the current period is the low-power consumption period; if the current period is not the low-power consumption period, controlling the water tank to standby, and then operating with the air-conditioning system according to the working mode selected by the user, and returning to judge again after the current period reaches the low-power consumption period.

[0014] Furthermore, the air-conditioning system control method includes: if the current time period is a period of low electricity consumption, detecting the second real-time temperature A3°C of the outdoor environment in the current time period, and comparing the second real-time temperature A3°C with the second preset temperature B°C; if A3°C<B°C, controlling the air-conditioning system to standby, and then operating according to the working mode selected by the user.

[0015] Furthermore, the air-conditioning system control method includes: if A3℃≥B℃, detecting the actual water temperature Tw in the water tank in the current period, and comparing the actual water temperature Tw with the target water temperature T1; if Tw≥T1, controlling the air-conditioning system to standby, and then operating according to the working mode selected by the user.

[0016] Furthermore, the air conditioning system control method includes: if Tw<T1, the air conditioning system is controlled to enter the water heating mode only, and after the actual water temperature Tw reaches the target water temperature T1, the air conditioning system is controlled to start the water tank insulation mode.

[0017] Applying the technical solution of the present invention, the air-conditioning system with water heating function of the present invention comprises: a compressor, a four-way valve, an indoor evaporator, an outdoor condenser, a first expansion valve, a second expansion valve, a water tank and a one-way valve, the outlet end of the compressor is connected to the first end of the four-way valve and the first end of the water tank, the inlet end of the compressor is connected to the second end of the four-way valve, the first end of the indoor evaporator is connected to the third end of the four-way valve, the first end of the outdoor condenser is connected to the fourth end of the four-way valve, any two of the second end of the indoor evaporator, the second end of the outdoor condenser and the second end of the water tank are connected, the first expansion valve is arranged at the second end of the water tank, the second expansion valve is arranged at the second end of the indoor evaporator, and the one-way valve is arranged at the second end of the water tank; wherein the first end of the four-way valve, the first end of the water tank and the second end of the outdoor condenser can be set to be on and off to control the air-conditioning system to execute multiple working modes, and the multiple working modes at least include a cooling and water heating mode and a water heating mode only. In this way, the air-conditioning system of the present invention can flexibly switch the working mode according to different needs and environmental conditions, which not only meets the cooling or heating needs of the air-conditioning system, but also can efficiently prepare hot water, solving the problem of direct discharge of air-conditioning waste heat in the prior art causing a large waste of resources. It is especially suitable for use in homes and small commercial places. For example, in summer, the air-conditioning system can give priority to indoor cooling while using waste heat to prepare hot water. In winter, the air-conditioning system can give priority to heating while providing a stable supply of hot water, which greatly improves energy utilization efficiency, realizes comprehensive utilization of energy, and reduces operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 A schematic diagram showing a refrigerant flow state of an embodiment of the air conditioning system of the present invention when in a cooling-only mode;

[0020] Figure 2 Shows Figure 1 The schematic diagram of the refrigerant flow state of the air conditioning system shown in FIG. 1 when the air conditioning system is in cooling and water heating modes;

[0021] Figure 3 Shows Figure 1 The schematic diagram of the refrigerant flow state of the air-conditioning system shown is in heating-only mode;

[0022] Figure 4 Shows Figure 1 The schematic diagram of the refrigerant flow state of the air-conditioning system shown in FIG. 1 is in the heating and water heating modes;

[0023] Figure 5 Shows Figure 1 The schematic diagram of the refrigerant flow state of the air-conditioning system shown is in the water heating mode only;

[0024] Figure 6 Shows Figure 1 A control step diagram of an embodiment of a control method for an air conditioning system shown;

[0025] Figure 7 Shows Figure 6 A flow chart of an embodiment of a control method for an air-conditioning system is shown.

[0026] The above drawings include the following reference numerals:

[0027] 1. Compressor; 2. Four-way valve; 3. Indoor evaporator; 4. Outdoor condenser; 5. First expansion valve; 6. Second expansion valve; 7. Water tank; 8. Check valve; 9. First control valve; 10. Second control valve; 11. Third control valve. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] like Figures 1 to 5As shown, the present invention provides an air conditioning system with a water heating function, comprising: a compressor 1, a four-way valve 2, an indoor evaporator 3, an outdoor condenser 4, a first expansion valve 5, a second expansion valve 6, a water tank 7 and a one-way valve 8, wherein the outlet end of the compressor 1 is connected to the first end of the four-way valve 2 and the first end of the water tank 7, the inlet end of the compressor 1 is connected to the second end of the four-way valve 2, the first end of the indoor evaporator 3 is connected to the third end of the four-way valve 2, the first end of the outdoor condenser 4 is connected to the fourth end of the four-way valve 2, any two of the second end of the indoor evaporator 3, the second end of the outdoor condenser 4 and the second end of the water tank 7 are connected, the first expansion valve 5 is arranged at the second end of the water tank 7, the second expansion valve 6 is arranged at the second end of the indoor evaporator 3, and the one-way valve 8 is arranged at the second end of the water tank 7; wherein the first end of the four-way valve 2, the first end of the water tank 7 and the second end of the outdoor condenser 4 can be set to be on and off to control the air conditioning system to perform multiple working modes, and the multiple working modes at least include a cooling and water heating mode and a water heating mode only. In this way, the air-conditioning system of the present invention can flexibly switch the working mode according to different needs and environmental conditions, which not only meets the cooling or heating needs of the air-conditioning system, but also can efficiently prepare hot water, solving the problem of direct discharge of air-conditioning waste heat in the prior art causing a large waste of resources. It is especially suitable for use in homes and small commercial places. For example, in summer, the air-conditioning system can give priority to indoor cooling while using waste heat to prepare hot water. In winter, the air-conditioning system can give priority to heating while providing a stable supply of hot water, which greatly improves energy utilization efficiency, realizes comprehensive utilization of energy, and reduces operating costs.

[0030] like Figures 1 to 5 As shown, the air conditioning system includes: a first control valve 9, which is arranged at the first end of the four-way valve 2 to control the on-off of the first end of the four-way valve 2; a second control valve 10, which is arranged at the first end of the water tank 7 to control the on-off of the first end of the water tank 7; and a third control valve 11, which is arranged at the second end of the outdoor condenser 4 to control the on-off of the second end of the outdoor condenser 4. Through the coordinated work of the first control valve 9, the second control valve 10 and the third control valve 11, the air conditioning system can accurately control the flow direction of the refrigerant, which not only improves the flexibility of the operation of the air conditioning system, but also can intelligently match the most suitable working mode under different seasons and weather conditions, thereby achieving the best energy utilization efficiency under different working modes, providing users with a more comfortable and energy-saving use experience.

[0031] like Figure 2 and Figure 5As shown, when the air conditioning system is in the cooling and water heating mode, the first control valve 9 is opened, the second control valve 10 is opened, the third control valve 11 is opened, the first end and the fourth end of the four-way valve 2 are connected, and the second end and the third end of the four-way valve 2 are connected; when the air conditioning system is in the water heating mode only, the first control valve 9 is closed, the second control valve 10 is opened, the third control valve 11 is opened, the second end and the fourth end of the four-way valve 2 are connected, and the indoor evaporator 3 and the second expansion valve 6 do not work. In this way, the cooling and water heating mode can ensure that the energy efficiency ratio of the air conditioning system will not be greatly reduced when preparing hot water while cooling, and in the water heating mode only, unnecessary air conditioning cooling or heating can be avoided, energy is saved, and the efficiency of hot water preparation is improved. It is especially suitable for those occasions where there is an immediate demand for hot water. It can quickly provide hot water while ensuring the comfort of the air conditioning system and improve the service quality.

[0032] like Figure 1 As shown, the air conditioning system includes a cooling-only mode. When the air conditioning system is in the cooling-only mode, the first control valve 9 is opened, the second control valve 10 is closed, the third control valve 11 is opened, the first end and the fourth end of the four-way valve 2 are connected, and the second end and the third end of the four-way valve 2 are connected. This cooling-only mode is suitable for hot summer weather when users only need the air conditioning system to cool and do not need to prepare hot water. It can quickly reduce the indoor temperature and ensure that users get a cool experience in the shortest time, maximize the cooling efficiency of the air conditioner, reduce energy consumption, and avoid energy loss in the hot water preparation process, thereby improving the overall system efficiency.

[0033] like Figure 3 As shown, the air conditioning system includes a heating-only mode. When the air conditioning system is in the heating-only mode, the first control valve 9 is opened, the second control valve 10 is closed, the third control valve 11 is opened, the first end and the third end of the four-way valve 2 are connected, and the second end and the fourth end of the four-way valve 2 are connected. This heating-only mode is suitable for cold weather in winter, when the user only needs the air conditioning system to heat, and does not need to prepare hot water, and can quickly increase the indoor temperature.

[0034] like Figure 4 As shown, the air conditioning system includes heating and water heating modes. When the air conditioning system is in the heating and water heating mode, the first control valve 9 is opened, the second control valve 10 is opened, the third control valve 11 is opened, the first end and the third end of the four-way valve 2 are connected, and the second end and the fourth end of the four-way valve 2 are connected. This heating and water heating mode enables the air conditioning system to provide indoor heating and hot water preparation at the same time in cold winter weather, meeting the user's demand for hot water while heating. While ensuring indoor warmth, it can provide instant hot water service, whether it is bathing, washing dishes or drinking hot water, it can be satisfied, greatly improving the user's living comfort, and improving the practicality of the air conditioning system and user satisfaction.

[0035] like Figure 6 and Figure 7 As shown, the present invention also provides an air-conditioning system control method, which is applicable to the above-mentioned air-conditioning system. The air-conditioning system control method includes: controlling the air-conditioning system to start up, when the hot water preparation economic mode is turned on, obtaining the usage time of multiple working modes within a predetermined number of days before the current date, calculating the actual ratio X1 of the usage time of the cooling and heating water modes and the usage time of the heating water mode alone, and comparing the actual ratio X1 with the set ratio X; if X1<X, then obtaining the temperature of the outdoor environment every day within the predetermined number of days before the current date, finding the temperature data of the highest temperature range of the outdoor environment every day, and calculating the outdoor environment within the predetermined number of days before the current date. The average temperature A1℃ of the highest temperature interval of each day is compared with the first preset temperature A℃; if A1℃≥A℃, the first real-time temperature A2℃ of the outdoor environment is detected at the time corresponding to the start time of the highest temperature interval of the next day, and the first real-time temperature A2℃ is compared with the first preset temperature A℃; if A2℃≥A℃, the actual water temperature Tw in the water tank 7 of the current period is detected, and the actual water temperature Tw is compared with the target water temperature T1; if Tw<T1, the air conditioning system is controlled to enter the single water heating mode, and after the actual water temperature Tw reaches the target water temperature T1, the air conditioning system is controlled to turn on the water tank insulation mode. In this way, the air conditioning system control method of the present invention can intelligently analyze the needs and environmental conditions of users, automatically adjust the working mode of the air conditioning system, select the most economical hot water preparation method, avoid energy waste, reduce the operating cost of the air conditioning system, and achieve sustainable energy utilization.

[0036] Specifically, the predetermined number of days may be one week.

[0037] like Figure 6 As shown, the air conditioning system control method includes: if X1≥X, the air conditioning system is controlled to standby, and then operates according to the working mode selected by the user; and / or if A1℃<A℃, the air conditioning system is controlled to standby, and then operates according to the working mode selected by the user; and / or if Tw≥T1, the air conditioning system is controlled to standby, and then operates according to the working mode selected by the user. This control strategy ensures that the air conditioning system can avoid unnecessary operation while meeting user needs, save energy, and improve the economy and environmental protection of the air conditioning system.

[0038] The air conditioning system control method of the present invention adopts the cooling and heating water mode to produce domestic hot water by recovering the condensation waste heat stably discharged by the air conditioning system during operation, which almost achieves zero additional power consumption. When the user has cooling needs in the near future, it will be more energy-saving to give priority to using the cooling and heating water mode to prepare hot water.

[0039] like Figure 6As shown, the air conditioning system control method includes: if A1℃<A℃ or A2℃<A℃, then obtain the electricity consumption valley period data of the area where the water tank 7 is located, and detect whether the current period is the electricity consumption valley period; if the current period is not the electricity consumption valley period, then control the water tank 7 to standby, and then operate with the air conditioning system according to the working mode selected by the user, and return to the judgment again after the current period reaches the electricity consumption valley period. In this way, the peak and valley differences of electricity prices are fully utilized, so that the air conditioning system can prepare hot water in the period with the lowest cost, avoiding the preparation of hot water in the period of high electricity prices, thereby reducing the user's electricity bill expenditure, especially in areas with large differences in electricity prices, the effect is particularly significant, and it also avoids the additional pressure on the power grid in the period of high electricity prices, which is conducive to the stable operation of the power grid and improves the economy of the air conditioning system.

[0040] like Figure 6 As shown, the air conditioning system control method includes: if the current period is a low electricity consumption period, detecting the second real-time temperature A3℃ of the outdoor environment in the current period, comparing the second real-time temperature A3℃ with the second preset temperature B℃; if A3℃<B℃, controlling the air conditioning system to standby, and then operating according to the working mode selected by the user. In this way, the dual factors of electricity price and outdoor temperature are taken into consideration, and the operating efficiency and economy of the system are further improved.

[0041] like Figure 6 As shown, the air conditioning system control method includes: if A3℃≥B℃, then detect the actual water temperature Tw in the water tank 7 in the current period, and compare the actual water temperature Tw with the target water temperature T1; if Tw≥T1, then control the air conditioning system to standby, and then operate according to the working mode selected by the user. This avoids overheating, ensures the comfort and safety of hot water, can quickly provide hot water when needed, and avoids the safety hazards caused by overheating, thereby improving the safety of use.

[0042] like Figure 6 As shown, the air conditioning system control method includes: if Tw<T1, the air conditioning system is controlled to enter the water heating mode only, and after the actual water temperature Tw reaches the target water temperature T1, the air conditioning system is controlled to start the water tank insulation mode. This not only ensures the timely supply of hot water, but also automatically enters the insulation mode after the hot water preparation is completed, avoiding the rapid drop of hot water temperature and improving the use experience of hot water. Especially in commercial places that require hot water supply, it ensures sufficient hot water supply during busy hours, and automatically enters the insulation mode during non-busy hours, reducing the heat loss of the air conditioning system and providing more efficient work efficiency.

[0043] The air-conditioning system and control method thereof of the present invention can flexibly respond to different seasons and environmental changes by intelligently analyzing user usage habits and environmental conditions, thereby ensuring the stability and reliability of air-conditioning and hot water supply, and realizing an efficient combination of hot water preparation and air-conditioning operation. While meeting the user's hot water needs, it reduces energy consumption, improves the overall energy efficiency of the system, effectively avoids energy waste during peak electricity consumption hours, reduces operating costs, and provides users with a more economical and environmentally friendly usage experience.

[0044] like Figure 7 As shown, the specific process of the air conditioning system control method of the present invention is as follows:

[0045] When the user has a need to prepare hot water, the optimal working mode is selected to prepare hot water according to the ambient temperature and the user's usage habits. When the proportion of the cooling and heating water modes used in the predetermined number of days before the current date is high, it is preferred to use the cooling and heating water modes to prepare hot water after the user has a cooling demand. When the proportion of the heating water mode used is high, it is necessary to determine whether the average temperature of the highest ambient temperature range of each day in the predetermined number of days before the current date meets the high-efficiency heating range of the water tank 7. If both of the above conditions are not met, the water tank 7 is used as a heat storage device to make full use of the peak-valley electricity price mechanism. When the ambient temperature exceeds the second preset temperature B°C, valley electricity heat storage is used to prepare hot water to reduce the operating cost of the air-conditioning system and improve the operating efficiency and economy of the air-conditioning system.

[0046] Whether to enter the hot water preparation economic mode is determined by the user as the basis for entering the next process:

[0047] When the user does not choose to start the hot water preparation economic mode, the air conditioning system is controlled to standby, and then operates according to the working mode selected by the user;

[0048] When the user chooses to turn on the hot water preparation economic mode, the air conditioning system obtains the usage time of the five working modes in the past week, calculates the actual ratio X1 of the usage time of the cooling and heating water modes and the usage time of the heating water mode alone, and compares the actual ratio X1 with the set ratio X. The comparison result is used as the basis for entering the next process:

[0049] (1) If X1 ≥ X, it is judged that the temperature in the past week is high, the user has a strong cooling demand, and the proportion of cooling and heating water mode is high. Since using cooling and heating water mode to prepare hot water is more economical, environmentally friendly and almost zero electricity consumption, the cooling and heating water mode should be used to prepare hot water according to the user's usage habits. At this time, the air conditioning system is controlled to standby, and then it runs according to the working mode selected by the user, and by default, the condensation waste heat of the air conditioning system is recovered to prepare hot water when the user has cooling demand.

[0050] If X1<X, it is judged that the temperature in the past week is suitable or low, resulting in a small cooling demand for users, and the single heating water mode is usually used to prepare hot water. At this time, the air conditioning system obtains the temperature data of the outdoor temperature sensing package automatically recorded every day in the past week, finds the highest temperature range of each day, calculates the average temperature A1℃ of the highest temperature range, and compares the average temperature A1℃ with the first preset temperature A℃. The comparison result is used as the basis for entering the next process:

[0051] (2) If A1°C ≥ A°C, it is judged that the temperature of the next day's highest temperature interval is likely to be in the high-efficiency heating interval of the water tank 7. The higher the temperature, the easier it is for the water tank 7 to absorb heat from the environment, and heating is more energy-saving and power-saving than when the temperature is low. Therefore, the air-conditioning system detects the first real-time temperature A2°C of the outdoor environment and the actual water temperature Tw in the water tank 7 at the start time of the next day corresponding to the start time of the highest temperature interval, compares the first real-time temperature A2°C with the first preset temperature A°C, and compares the actual water temperature Tw with the target water temperature T1. The comparison result is used as the basis for entering the next process:

[0052] (3) If A2℃≥A℃, and Tw<T1, the air conditioning system enters the water heating mode only. At this time, the first control valve 9 is closed, the second control valve 10 is opened, the third control valve 11 is opened, the second end and the fourth end of the four-way valve 2 are connected, the indoor evaporator 3 and the second expansion valve 6 are not working, and the outdoor condenser 4 is started. The working efficiency of the air conditioning system is equivalent to that of an air-to-water heater. All the heat is used to heat the water in the water tank 7. After the actual water temperature Tw reaches the target water temperature T1, the air conditioning system is controlled to start the water tank insulation mode.

[0053] If A2℃≥A℃, and Tw≥T1, the air conditioning system is controlled to standby, and then operates according to the working mode selected by the user.

[0054] If A1℃<A℃ or A2℃<A℃, the air-conditioning system obtains the data of the low-power consumption period in the area where the water heater is located, and detects whether the current period reaches the low-power consumption period. If the current period is not the low-power consumption period, the air-conditioning system is controlled to standby, and then operates according to the working mode selected by the user, and returns to judge again after the current period reaches the low-power consumption period.

[0055] If the current period is a low-power period, obtain the second real-time temperature A3°C detected by the outdoor environment temperature sensing package and the actual water temperature Tw in the water tank 7 during the current period, compare the second real-time temperature A3°C with the second preset temperature B°C, and compare the actual water temperature Tw with the target water temperature T1, and use the comparison result as the basis for entering the next process:

[0056] (4) If A3℃≥B℃ and Tw<T1, the air conditioning system is controlled to enter the water heating mode only.

[0057] If A3℃<B℃ or Tw≥T1, the air conditioning system is controlled to standby, and then operates according to the working mode selected by the user.

[0058] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0059] The air conditioning system with water heating function of the present invention comprises: a compressor 1, a four-way valve 2, an indoor evaporator 3, an outdoor condenser 4, a first expansion valve 5, a second expansion valve 6, a water tank 7 and a one-way valve 8, the outlet end of the compressor 1 is connected to the first end of the four-way valve 2 and the first end of the water tank 7, the inlet end of the compressor 1 is connected to the second end of the four-way valve 2, the first end of the indoor evaporator 3 is connected to the third end of the four-way valve 2, the first end of the outdoor condenser 4 is connected to the fourth end of the four-way valve 2, any two of the second end of the indoor evaporator 3, the second end of the outdoor condenser 4 and the second end of the water tank 7 are connected, the first expansion valve 5 is arranged at the second end of the water tank 7, the second expansion valve 6 is arranged at the second end of the indoor evaporator 3, and the one-way valve 8 is arranged at the second end of the water tank 7; wherein the first end of the four-way valve 2, the first end of the water tank 7 and the second end of the outdoor condenser 4 can be set to be on and off to control the air conditioning system to perform multiple working modes, and the multiple working modes at least include a cooling and water heating mode and a water heating mode only. In this way, the air-conditioning system of the present invention can flexibly switch the working mode according to different needs and environmental conditions, which not only meets the cooling or heating needs of the air-conditioning system, but also can efficiently prepare hot water, solving the problem of direct discharge of air-conditioning waste heat in the prior art causing a large waste of resources. It is especially suitable for use in homes and small commercial places. For example, in summer, the air-conditioning system can give priority to indoor cooling while using waste heat to prepare hot water. In winter, the air-conditioning system can give priority to heating while providing a stable supply of hot water, which greatly improves energy utilization efficiency, realizes comprehensive utilization of energy, and reduces operating costs.

[0060] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0061] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0062] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0063] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0064] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air conditioning system with water heating function, characterized in that: include: A compressor (1), a four-way valve (2), an indoor evaporator (3), an outdoor condenser (4), a first expansion valve (5), a second expansion valve (6), a water tank (7) and a one-way valve (8), wherein the outlet end of the compressor (1) is connected to the first end of the four-way valve (2) and the first end of the water tank (7), the inlet end of the compressor (1) is connected to the second end of the four-way valve (2), the first end of the indoor evaporator (3) is connected to the third end of the four-way valve (2), the first end of the outdoor condenser (4) is connected to the fourth end of the four-way valve (2), the second end of the indoor evaporator (3), Any two of the second ends of the outdoor unit condenser (4) and the second ends of the water tank (7) are connected, the first expansion valve (5) is arranged at the second end of the water tank (7), the second expansion valve (6) is arranged at the second end of the indoor unit evaporator (3), and the one-way valve (8) is arranged at the second end of the water tank (7); wherein the first end of the four-way valve (2), the first end of the water tank (7) and the second end of the outdoor unit condenser (4) can be set to be on and off to control the air-conditioning system to execute multiple working modes, and the multiple working modes at least include a cooling and heating water mode and a heating water mode only.

2. The air conditioning system with water heating function according to claim 1, characterized in that: The air conditioning system comprises: a first control valve (9), the first control valve (9) being arranged at a first end of the four-way valve (2) to control the on-off of the first end of the four-way valve (2); A second control valve (10), the second control valve (10) being arranged at the first end of the water tank (7) to control the on-off of the first end of the water tank (7); A third control valve (11), the third control valve (11) being arranged at the second end of the external unit condenser (4) to control the on-off of the second end of the external unit condenser (4).

3. The air conditioning system with water heating function according to claim 2, characterized in that: When the air conditioning system is in the cooling and water heating mode, the first control valve (9) is opened, the second control valve (10) is opened, the third control valve (11) is opened, the first end and the fourth end of the four-way valve (2) are connected, and the second end and the third end of the four-way valve (2) are connected; When the air-conditioning system is in the water heating mode only, the first control valve (9) is closed, the second control valve (10) is opened, the third control valve (11) is opened, the second end and the fourth end of the four-way valve (2) are connected, and the indoor evaporator (3) and the second expansion valve (6) are not working.

4. The air conditioning system with water heating function according to claim 2, characterized in that: The air conditioning system includes a cooling-only mode. When the air conditioning system is in the cooling-only mode, the first control valve (9) is opened, the second control valve (10) is closed, the third control valve (11) is opened, the first end and the fourth end of the four-way valve (2) are connected, and the second end and the third end of the four-way valve (2) are connected.

5. The air conditioning system with water heating function according to claim 2, characterized in that: The air conditioning system includes a heating-only mode. When the air conditioning system is in the heating-only mode, the first control valve (9) is opened, the second control valve (10) is closed, the third control valve (11) is opened, the first end and the third end of the four-way valve (2) are connected, and the second end and the fourth end of the four-way valve (2) are connected.

6. The air conditioning system with water heating function according to claim 2, characterized in that: The air conditioning system includes a heating and water heating mode. When the air conditioning system is in the heating and water heating mode, the first control valve (9) is opened, the second control valve (10) is opened, the third control valve (11) is opened, the first end and the third end of the four-way valve (2) are connected, and the second end and the fourth end of the four-way valve (2) are connected.

7. A method for controlling an air conditioning system, characterized in that: Applicable to the air conditioning system according to any one of claims 1 to 6, the air conditioning system control method comprising: Controlling the air conditioning system to start up, when the hot water preparation economic mode is turned on, obtaining the usage time of the multiple working modes within a predetermined number of days before the current date, calculating the actual ratio X1 of the usage time of the cooling and heating water mode and the usage time of the heating water mode alone, and comparing the actual ratio X1 with the set ratio X; If X1<X, then obtain the daily temperature of the outdoor environment within the predetermined number of days before the current date, find the temperature data of the maximum temperature range of each day in the outdoor environment, calculate the average temperature A1℃ of the maximum temperature range of each day in the outdoor environment within the predetermined number of days before the current date, and compare the average temperature A1℃ with the first preset temperature A℃; If A1°C ≥ A°C, then at the time corresponding to the start time of the highest temperature interval on the next day, detect the first real-time temperature A2°C of the outdoor environment, and compare the first real-time temperature A2°C with the first preset temperature A°C; If A2°C ≥ A°C, then detect the actual water temperature Tw in the water tank (7) during the current period, and compare the actual water temperature Tw with the target water temperature T1; If Tw<T1, the air conditioning system is controlled to enter the water heating mode only, and after the actual water temperature Tw reaches the target water temperature T1, the air conditioning system is controlled to start the water tank insulation mode.

8. The air conditioning system control method according to claim 7, characterized in that: The air conditioning system control method comprises: If X1≥X, the air conditioning system is controlled to standby, and then operates according to the working mode selected by the user; and / or If A1℃<A℃, control the air conditioning system to standby, and then operate according to the working mode selected by the user; and / or If Tw≥T1, the air conditioning system is controlled to standby, and then operates according to the working mode selected by the user.

9. The air conditioning system control method according to claim 7, characterized in that: The air conditioning system control method comprises: If A1℃<A℃ or A2℃<A℃, then obtain the electricity consumption valley period data of the area where the water tank (7) is located, and detect whether the current period is a electricity consumption valley period; If the current period is not the low electricity consumption period, the water tank (7) is controlled to be in standby mode, and then the air conditioning system operates according to the working mode selected by the user, and returns to the judgment again after the current period reaches the low electricity consumption period.

10. The air conditioning system control method according to claim 9, characterized in that: The air conditioning system control method comprises: If the current time period is the low power consumption time period, detecting the second real-time temperature A3°C of the outdoor environment in the current time period, and comparing the second real-time temperature A3°C with the second preset temperature B°C; If A3°C<B°C, the air conditioning system is controlled to standby, and then operates according to the working mode selected by the user.

11. The air conditioning system control method according to claim 10, characterized in that: The air conditioning system control method comprises: If A3°C ≥ B°C, then detect the actual water temperature Tw in the water tank (7) during the current period, and compare the actual water temperature Tw with the target water temperature T1; If Tw≥T1, the air conditioning system is controlled to standby, and then operates according to the working mode selected by the user.

12. The air conditioning system control method according to claim 11, characterized in that: The air conditioning system control method comprises: If Tw<T1, the air conditioning system is controlled to enter the water heating mode only, and after the actual water temperature Tw reaches the target water temperature T1, the air conditioning system is controlled to start the water tank insulation mode.

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