Four-season hot water unit capable of refrigerating in summer and heating in winter

Abstract

The four-season hot water unit capable of refrigerating in summer and heating in winter comprises a cold-warm hot water machine and a hot water system, the system is characterized in that hot water is free in summer, more than 70% of electricity is saved for hot water in spring and autumn, double heating is achieved, and hot water energy is used for defrosting; the cold-warm water heater forms a four-circulation loop through a compressor, a four-way valve, an indoor heat exchanger, an outdoor heat exchanger, a first hot water heat exchanger, a second hot water heat exchanger, four throttlers and a gas-liquid separator; an outlet of the compressor is divided into two paths which are respectively connected with the four-way valve and an inlet of the first hot water heat exchanger; a liquid outlet of the first hot water heat exchanger is respectively connected with second interfaces of the outdoor and inner air heat exchangers through a first throttler and a second throttler; a second interface, a third interface and a fourth interface of the four-way valve are respectively connected with second interfaces of the outdoor heat exchanger and the inner heat exchanger and the gas-liquid separator; the second heat exchanger is inserted between the indoor heat exchanger and the inlet of the third throttler; a second interface of the outdoor heat exchanger is connected with a liquid outlet of the second heat exchanger through a bidirectional throttler to form a four-circulation loop; the hot water system has three heat exchange modes of self-circulation, forced circulation and heating circulation, and hot water is discharged through water inlet jacking; the hot water heating loop comprises a hot water circulating pump, a second hot water heat exchanger, a first hot water heat exchanger, a second outlet of the three-way valve, a hot water fan heater and a hot water circulating pump; manual and self-control hot water, refrigeration and double heating modes are adopted for operation.

Description

Technical Field

[0001] The utility model relates to the technical field of air-conditioning heat pump heating and hot water systems. Background Art

[0002] Indoor air conditioning, hot water and heating are the general needs of people, and energy conservation and low-carbon environmental protection are the requirements for human survival and sustainable development. However, the current household air conditioners, while producing cold air for the indoor air in summer, emit a large amount of heat energy to the outdoor air, which cannot be used, which is a waste of energy and causes environmental thermal pollution. In addition, the traditional air conditioners are idle for a long time in spring and autumn, and the equipment utilization rate is too low, which is also a waste of equipment. Furthermore, in winter, the hot air of the air conditioners is used for heating. Generally, several low-power air conditioners are installed in multiple rooms of a family, and the hot air blowing on the ceiling is uncomfortable. The popular air source heat pump provides hot water and the floor heating method of laying hot water pipes under the floor has good comfort, but the disadvantage is that the project is huge, the cost of floor heating exceeds the cost of heat pumps, the heat capacity is large, the start-up is slow, and continuous heating is required. When no one is at home during work during the day, the heat of continuous heating is dissipated to the environment through the walls of the house, and the energy-saving effect is greatly reduced. The biggest obstacle to using air source heat pumps for heating in winter is the defrosting problem. In cold and humid areas, the frost on the outdoor heat exchanger of the heat pump seriously endangers the normal operation of the heat pump, and now The most common reverse cycle defrosting method is that the exhaust gas of the compressor enters the outdoor heat exchanger for defrosting, and then enters the indoor heat exchanger through the throttle, and is not allowed to absorb heat from the indoor room, otherwise it will become indoor cooling. The liquid refrigerant flowing through the indoor heat exchanger has to flow into the gas-liquid separator through the four-way valve. Although the stored liquid in the gas-liquid separator will provide part of the heat, there is still liquid refrigerant sucked into the compressor, which can only be vaporized by the heat generated by the compression work of the compressor. Therefore, the heat for defrosting only uses the electric work consumed by the compressor; using high-quality electric energy for defrosting is a waste of energy use; due to insufficient defrosting energy and long defrosting time, the heating capacity of the heat pump is seriously reduced; in severe weather, frequent defrosting will cause the heat pump to fail to work normally; because the refrigerant liquid cannot obtain heat to evaporate in the indoor heat exchanger, there is a risk of compressor liquid shock; therefore, the lack of suitable energy for heat pump defrosting is a problem that plagues the refrigeration industry; although there are also proposals to adopt the method of absorbing the heat of the compressor exhaust to store heat, it has not been promoted due to the heat transfer performance and volume of the phase change heat storage device or the complexity of the system. Summary of the invention

[0003] In view of the fact that the energy-saving space of existing air conditioners has not been fully explored, the dilemma of existing air source heat pumps in winter heating and defrosting, and the shortcomings of high cost and complex construction of floor heating, the utility model proposes a four-season hot water unit for summer cooling and winter heating, which has the functions of cooling air air conditioning and hot water in summer, and free hot water; domestic hot water in spring and autumn, which saves more than 70% energy than electric water heaters; in winter, it is a heating and defrosting cycle for air source heat pumps, providing the heat of homemade hot water, which saves 50% energy than simply consuming compressor power; sufficient defrosting energy, shortening defrosting time , providing the unit with heating capacity; in addition, a dual-mode heating function of heating air and hot water is designed, which saves 70% of the cost compared with the floor heating method; the summer cooling and winter heating four-season hot water unit described in this invention has only one four-way valve in its fluorine circuit, which can organize four cycles including a compressor, indoor and outdoor heat exchangers, the first and second hot water heat exchangers and four throttles; its water circuit uses a three-way valve, which can organize self-circulation, forced circulation and heating circulation; energy-saving, simple, comfortable, and fully functional, it is the supreme version of a household cooling, heating, air conditioning and hot water three-in-one machine.

[0004] The utility model provides a four-season hot water machine for cooling in summer and heating in winter, comprising a hot and cold water machine and a hot water system of a fluorine circuit system; the hot and cold water machine comprises a compressor, a four-way valve, indoor and outdoor heat exchangers, a hot water heat exchanger, a throttle, and a gas-liquid separator; its characteristics are as follows: the hot water heat exchanger of the hot and cold water machine comprises a first hot water heat exchanger and a second hot water heat exchanger, the first hot water heat exchanger is a hot water heat exchanger integrated with a hot water tank and a hot water heat exchanger, and the second hot water heat exchanger has the functions of making hot water and providing heat for defrosting; the throttle comprises a first, a second, a third, and a fourth throttle; the connection method of the hot and cold water machine is as follows: the air outlet of the compressor is divided into two paths, the first path is connected to the air inlet of the fluorine circuit of the first hot water heat exchanger, and the second path is connected to the first interface of the four-way valve; the fluorine circuit liquid outlet of the first hot water heat exchanger is connected to the outdoor by the first and second throttles respectively. , and the second interface of the indoor heat exchanger; the second, third and fourth interfaces of the four-way valve are respectively connected to the first interfaces of the outdoor and indoor heat exchangers and the air inlet of the gas-liquid separator; the air inlet of the second hot water heat exchanger is connected to the second interface of the indoor heat exchanger; the liquid outlet of the second hot water heat exchanger is connected to the inlet of the third throttle and the outlet of the fourth throttle via the one-way valve D; the outlet of the third throttle and the inlet of the fourth throttle are connected to the second interface of the outdoor heat exchanger; the connected circuit is filled with refrigerant and has three functional cycles: in summer, the indoor heat exchanger cools the air, and the first hot water heat exchanger also makes hot water circulation; in spring and autumn, the outdoor heat exchanger absorbs heat, and the first and second hot water heat exchangers make hot water circulation; in winter, the outdoor heat exchanger absorbs heat, the indoor heat exchanger heats the air, and the first and second hot water heat exchangers make hot water for hot water heating circulation; and a defrost cycle.

[0005] The utility model is characterized in that the hot water system is composed of a hot water circulation pump, water circuits of the first and second hot water heat exchangers, a three-way valve, a hot water heater, a hot water circulation pipe, a hot water heating pipe, a hot water pipe, a return pipe, a water inlet valve, a water inlet safety pressure relief valve, and a hot water tap. There are three types of hot water exchange circuits: a self-circulating hot water exchange circuit, a forced circulation hot water exchange circuit, and a heating circulation water circuit; the hot water is discharged by pressing out tap water;

[0006] The self-circulating hot water exchange circuit is a self-circulating hot water exchange circuit for water in the hot water tank of the first hot water heat exchanger; it does not require the operation of a hot water circulation pump and can be used in a cooling and hot water production mode in summer;

[0007] The forced circulation water exchange circuit is a circulating water circuit connected in sequence by a hot water circulation pump, a second hot water heat exchanger, a first hot water heat exchanger, a first outlet of a three-way valve, a hot water circulation pipe, a return pipe, and a hot water circulation pump; the hot water circulation pump is in operation and is used in a hot water generation mode in spring and autumn;

[0008] The heating circulation water exchange circuit is composed of a hot water circulation pump, a second hot water heat exchanger, a first hot water heat exchanger, a second outlet of a three-way valve, a hot water heating pipe, a plurality of hot water heating fans in parallel, a return pipe, a hot water circulation pump, and a heating circulation water circuit connected in sequence by connecting water pipes; the hot water circulation pump and the heating fan are both running, and are used for hot water heating in winter;

[0009] The method of using tap water to pressurize hot water is composed of a water inlet valve, a water inlet safety pressure relief valve, a first hot water heat exchanger, a hot water pipe and a plurality of hot water faucets connected in parallel; the water inlet valve connected to the tap water pipe is always in an open state, and hot water can be used no matter what the circulating water state is as long as the faucet is turned on.

[0010] The summer cooling and winter heating four-season hot water machine is characterized in that: the four-three function cycles of the cold and warm hot water machine cooperate with the three heat exchange circulation water circuits of the hot water system to perform three functional modes of operation: respectively referred to as: hot water, cooling, and heating modes; the fluorine circuit circulation, water circuit operation mode and heat exchange of the three modes are respectively introduced as follows:

[0011] Hot water mode is an independent hot water production mode in spring and autumn; fluorine circuit circulation: the compressor outlet is divided into two routes, the first fluorine circuit, through the first hot water heat exchanger condenses and releases heat to make hot water, the first throttle, enters the outdoor heat exchanger to evaporate and absorb heat from the outdoor air; the second fluorine circuit passes through the four-way valve, the indoor heat exchanger, and the indoor fan stops without effective heat exchange, the second hot water heat exchanger condenses and releases heat to make hot water, the third throttle, enters the outdoor heat exchanger to evaporate and absorb heat; the two merged refrigerant gases pass through the four-way valve and the gas-liquid separator and return to the compressor to complete the fluorine circuit circulation; the hot water circulation pump is running, the three-way valve is at the first outlet position, and the forced circulation hot water exchange circuit is running;

[0012] The cooling mode is a summer cooling and hot water mode; fluorine circuit circulation: the compressor outlet is divided into two routes, the first fluorine route, through the first hot water heat exchanger condensation heat exchange to make hot water, the second throttle, into the indoor heat exchanger to evaporate and absorb heat to cool the gas; the second fluorine route, through the four-way valve, the outdoor heat exchanger condensation heat release, the fourth throttle, the one-way valve D, the second hot water heat exchanger has no water flow and no heat exchange, the indoor heat exchanger evaporates and absorbs heat to cool the gas; the refrigerant gas merged in the two routes passes through the four-way valve, the gas-liquid separator, and returns to the compressor to complete the fluorine circuit circulation; the water in the hot water tank of the first hot water heat exchanger self-circulates for heat exchange, and the hot water circulation pump stops;

[0013] The heating mode is a mode for heating air and hot water in winter; fluorine circuit circulation: the outlet of the compressor is divided into two routes, the first fluorine circuit, through the first hot water heat exchanger condensation heat release to make hot water, the first throttle, enter the outdoor heat exchanger to absorb heat; the second fluorine circuit, through the four-way valve, the indoor heat exchanger fan starts to dissipate heat and produce heating air; the fan stops and there is no effective heat exchange and no hot air is blown, the second hot water heat exchanger condenses heat release to make hot water, the third throttle, enters the outdoor heat exchanger to absorb heat and evaporate; the refrigerant gas merged in the two routes returns to the compressor through the four-way valve and the gas-liquid separator to complete the fluorine circuit circulation; the water circuit performs heating cycle heat exchange, the hot water circulation pump runs, and the three-way valve is in the second outlet position; heating mode 1 is a hot air heating mode, the indoor fan runs, and the heating fan stops; heating mode 2 is a hot water heater heating mode, the indoor fan stops, and the heating fan runs; heating mode 3 is a hot air and hot water combined heating mode, and both the indoor fan and the heating fan run.

[0014] The summer cooling and winter heating four-season hot water unit is characterized in that: the system is provided with indoor and outdoor air temperatures, the pipe wall temperatures of the indoor and outdoor heat exchangers near the compressor ports, the suction and exhaust pipe port temperatures of the compressor, the outlet water temperature of the first hot water heat exchanger, the hot water temperature at the middle position of the hot water tank, the inlet and outlet water temperatures of the hot water heater, the outlet air temperature of the hot water heater, and the signal detection of the compressor current; the air conditioner overcurrent protection and overheating protection are provided; the three functional modes of the summer cooling and winter heating four-season hot water unit: hot water, cooling, and heating adopt a manual and automatic combination of control methods; the operating states and controls of the three functional modes are respectively:

[0015] Hot water mode: automatic control based on the difference △Tw between the hot water temperature Tw and the set water temperature Tw0; default Tw0=45℃, default maximum water temperature fluctuation allowable deviation △Ta0=5℃, default maximum safe water temperature Tw,max=52℃; user manually presses the button or voice control to specify the "hot water" mode, the user first confirms or modifies the set water temperature Tw0 value, which is limited to 40-45℃; when the "hot water" mode is specified, the four-way valve is in the heating position coil off potential (①③, ②④ are connected), the three-way valve is in the first outlet position agreed to coil off, the unit enters the hot water mode standby state;

[0016] When Tw≤Tw0, the hot water production will start automatically, the compressor, outdoor fan and hot water circulation pump will all run, and the indoor fan will stop. It can be stopped manually or automatically.

[0017] When Tw≥(Tw0+△Tw0), the hot water production will be automatically stopped, the compressor, outdoor fan and hot water circulation pump will stop running, and the unit will resume the standby state of hot water mode; to exit the hot water mode, manual intervention is adopted, that is, the "shutdown" button is touched;

[0018] Cooling mode: Control is performed based on the difference △Ta between the indoor temperature Ta and the set room temperature Ta0, and the hot water temperature is not a control parameter; the default Ta0=26℃, the default maximum room temperature fluctuation allowable deviation △Ta0=2℃; the user manually presses the button or voice control to specify the "cooling" mode; the user first confirms or modifies the set room temperature Ta0 value, which is limited to the range of 22-28℃; when the "cooling mode" is specified, the four-way valve cooling position coil is energized, the three-way valve first outlet position coil is de-energized, the unit enters the cooling mode standby state, and the hot water circulation pump stops;

[0019] When the room temperature Ta≥Ta0, the cooling mode is automatically started, and the compressor, indoor and outdoor fans are immediately running, supplying cooling air as the main function, and the hot water self-circulation heat exchange of the first hot water heat exchanger as the secondary function; when the cooling mode is running, the water temperature of the hot water tank will exceed the maximum water temperature limit due to the heat received from the superheated air, and it is left to nature;

[0020] When the room temperature Ta≤Ta0-△Ta0, the refrigeration stops automatically, the compressor and the indoor and outdoor fans stop, and the machine is in the refrigeration standby state;

[0021] When the compressor and fan used are variable frequency machines, the speed of the compressor and indoor and outdoor fans is the maximum value Vmax at the beginning, and the speed gradually decreases as the room temperature drops, and runs at the minimum maintenance speed close to Ta0;

[0022] Heating mode: controlled by the difference △Ta between the indoor temperature Ta and the set room temperature Ta0; start mode: user manually presses the button, or voice control specifies the "heating" mode; when the heating mode is running, the user first confirms or modifies the set room temperature Ta0 value, and it is recommended to set the room temperature Ta0 = 22℃ not lower than the national heating standard indoor temperature of 18℃; when the "heating mode" is specified, the four-way valve is de-energized in the heating position coil (①③, ②④ are connected); the three-way valve is energized in the second outlet position coil, and the unit automatically enters the standby state;

[0023] When the room temperature Ta≤Ta0, the unit automatically starts the heating mode, starts the compressor, outdoor fan, and hot water circulation pump. When the indoor heat exchanger tube wall temperature is higher than the default setting temperature of 45℃ for starting the indoor fan and the hot water temperature is higher than 45℃, the indoor fan and heating fan are turned on and run at medium speed; manual intervention is adopted for the start and stop and speed of the indoor fan and heating fan, and the recommended output hot air temperature is 8℃ higher than the room temperature as an indicator for adjusting the fan speed; when the indoor fan is running and the heating fan is stopped, it is the hot air heating mode; when the indoor fan is stopped and the heating fan is running, it is the hot water heating mode; when both the indoor fan and the heating fan are running, it is the hot air heating mode;

[0024] When Ta≥(Ta0+△Ta), heating is automatically started, the compressor, indoor and outdoor fans, hot water circulation pump, and heating fan are all stopped, and the system is in heating standby mode. To exit the heating mode, the system can be manually “shut down”.

[0025] When the compressor and fan are variable frequency machines, the compressor runs at a constant speed;

[0026] Automatic mode control: implement the hot water priority principle, that is, in the three modes of hot water, cooling and heating, the hot water mode is implemented first, and then the cooling or heating mode is selected according to the comparison value between the room temperature and the default room temperature setting.

[0027] The summer cooling and winter heating four-season hot water unit is characterized in that the defrosting energy of the summer cooling and winter heating four-season hot water unit is provided by the hot water flowing through the second hot water heat exchanger and the input work of the compressor; the starting conditions: when the outdoor temperature is lower than 5°C in the heating mode, the temperature difference between the outdoor air temperature and the outdoor heat exchanger tube wall temperature suddenly exceeds the set value; or the outdoor heat exchanger tube wall temperature suddenly drops rapidly, and the drop rate exceeds the normal drop rate by 1 times, the control system issues a defrost command and enters the defrost mode operation: the four-way valve is in the cooling position and the coil is energized (①②, ③④ are connected), and the compressor The machine and hot water circulation pump are running; the indoor fan and outdoor fan are stopped; the three-way valve is in the first outlet position; the forced circulation water exchange circuit is operated; the fluorine circuit in defrost mode: the compressor, the four-way valve, the outdoor heat exchanger is equivalent to the condenser hot air condensation defrosting, the fourth throttle, the one-way valve D, the second hot water heat exchanger has hot water to provide heat for refrigerant evaporation, the indoor heat exchanger fan does not turn and there is no heat exchange, the four-way valve, the gas-liquid separator, and the compressor inputs compression work; when the outdoor heat exchanger tube wall temperature recovers to exceed 8°C, it automatically switches to heating mode, the three-way valve returns to the second outlet position, and the hot water heating cycle is restored.

[0028] The summer cooling and winter heating four-season hot water unit described in the utility model is characterized in that: the first hot water heat exchanger is a hot water heat exchanger integrated with a hot water tank and a hot water heat exchanger, and is a heat exchanger with a guide sleeve and a spiral coil built in the hot water tank. The diameter of the guide sleeve is 20-40 mm larger than the outer diameter of the spiral coil, and the top and bottom of the guide sleeve are 5-10 cm away from the top and bottom of the hot water tank; the first hot water heat exchanger is a fluorine water plate heat exchanger, or a sleeve-type heat exchanger.

[0029] The summer cooling and winter heating four-season hot water unit described in the utility model, according to the climate difference between the north and the south, has derived designs of advanced, practical, simple and minimalist types; its characteristics are: the advanced type, its compressor is a variable frequency compressor, its first and third throttles are electronic expansion valves, its control method is equipped with voice control and remote intelligent control system, and it runs automatically and continuously; the practical type, its compressor is a fixed frequency or variable frequency compressor, its first, second, third and fourth throttles are capillaries, its three-way valve is a manual three-way valve, the operating mode is manually selected, and an automatic mode is available; the simple type is not equipped with a hot water heater heating system; the minimalist type cancels the second hot water heat exchanger and the hot water circulation pump, and only relies on the self-convection heat exchange of water in the hot water tank with an integrated hot water heat exchanger, and simply retains the cooling, heating and hot water functions.

[0030] The innovative features of this utility model mainly include:

[0031] 1. The invention discloses a four-season hot water unit for cooling in summer and heating in winter, in which the hot and cold water machine can cleverly realize three functional cycles by using only one four-way valve: cooling air and making hot water in summer, making hot water by absorbing heat from outdoor air in spring and autumn, and heating air and hot water in winter; the three functional cycles include a fluorine-free circuit: two independent hot water-making cycles with the first hot water heat exchanger as the condenser and the indoor and outdoor heat exchangers as the evaporators, and a cooling air and heating cycle with the indoor and outdoor heat exchangers as the evaporators and condensers of each other; the design innovation is that the traditional fluorine circuit of the cold and warm air conditioner is cleverly combined in parallel with the fluorine circuit of the first hot water heat exchanger for making hot water, and the liquid outlet at the bottom of the first hot water heat exchanger is connected to the second interface (liquid inlet) of the outdoor and indoor heat exchangers respectively through the first and second throttles, producing Three unexpected effects: (1) The condensate of the hot water heat exchanger passes through two throttles and automatically selects the throttling path by virtue of the pressure difference between the compressor outlet and the indoor or outdoor heat exchanger when used as an evaporator, cleverly forming a hot water heating cycle with the indoor or outdoor heat exchanger as the evaporator and the hot water heat exchanger as the condenser, without the need for additional valve control; (2) Hot water can be produced regardless of whether the air-conditioning water heater performs a cooling or heating cycle; (3) The compressor outlet remains connected to the first interface of the four-way valve, thus maintaining the cooling and heating functions of the original air-conditioning machine; this is a magical invention. The above three innovations have made the air-conditioning water heater with four cycles of cooling, heating and dual-source hot water heating extremely simple, with obvious novelty and outstanding advancement, and are original inventions.

[0032] 2. The four-season hot water unit for cooling in summer and heating in winter described in the utility model completely solves the defrosting problem of the air conditioner. A second hot water heat exchanger is added between the indoor heat exchanger and the third throttle. It has two functions: (1) It acts as an evaporator during the reverse defrosting cycle during defrosting to provide the heat of the hot water in the hot water tank for defrosting; it overcomes the problem that the traditional air conditioner cannot absorb heat from the room during the defrosting cycle in winter, which is energy-saving and safe. The conventional reverse cycle defrosting method is widely used because the liquid refrigerant entering the indoor heat exchanger cannot obtain heat and can only pass through the compressor. The heat generated by the fast-running compression work is used for defrosting, and the utility model adopts the second hot water heat exchanger to serve as the evaporator during defrosting, using the heat of hot water in the hot water tank to quantify the defrosting. The energy cost is only 1 / 3 of the electrical energy, i.e., the compression work, and the defrosting speed is fast, which is a breakthrough in ensuring the safe and efficient operation of the heat pump in winter; (2) during the heating cycle, the sensible heat of the supercooled liquid before throttling can be recovered from the condensed liquid, saving energy and improving the heating efficiency. The added second hot water heat exchanger is one of the innovative features of the four-season hot water unit for summer cooling and winter heating described in the utility model, ensuring continuous and reliable operation of winter heating.

[0033] 3. The utility model discloses a four-season hot water unit for cooling in summer and heating in winter, with dual heating modes, and adopts a hot water heater with a fan for forced heat dissipation. It has four contributions: (1) It ensures that the heat transfer temperature zone of the hot water heater matches the hot water outlet temperature zone of the air source heat pump, with the hot water at 50°C and the return water at 42°C, thereby realizing a new heating mode of the air source heat pump that replaces the floor heating mode. Compared with floor heating, the hot water heater is much simpler to heat, and the cost and installation fee are less than 1 / 4 of that of floor heating; (2) It changes the heating mode of the fixed area of ​​the single air conditioner blowing hot air to the top, and the dual heating mode is adopted. Heating method: multi-room extended hot water heater heating. The hot water heater is installed like a radiator, with the air outlet less than 1 meter from the ground. It uses a centrifugal fan wheel to dissipate heat, has low noise, and its heat transfer capacity is several times stronger than that of a radiator. It has the advantage of centrally transferring heat to different places where it is needed; (3) Dual heating method: with moderate heat capacity, the heating time can be adjusted according to humanized time, which is more energy-saving than the long-term operation of floor heating; (4) Compared with the one-machine-multiple-drag fluorine-circuit heating method and floor heating method, it is simple, low-cost, easy to control, and comfortable; the dual heating method is an innovation in heating methods.

[0034] 4. The hot water system of the four-season hot water unit for cooling in summer and heating in winter described in the utility model uses a three-way valve to organize four types of hot water circulation water circuits: a self-circulating hot water exchange circuit; a forced circulation hot water exchange circuit; a heating circulation hot water exchange circuit; and a tap water top pressure hot water output method. The self-circulating hot water exchange circuit is used in summer to save the running cost of the hot water circulation pump. The forced circulation hot water exchange circuit is used in spring and autumn, and the first and second hot water heat exchangers both participate in the heat exchange, which strengthens the heat exchange and improves the unit efficiency and hot water output power. The heating circulation hot water exchange circuit is responsible for transmitting the heat obtained by the first and second hot water heat exchangers to the hot water heater to heat the rooms far away from the indoor unit, which is energy-saving and comfortable. It transmits hot water heat for defrosting. It adopts the tap water top pressure water output method, which is automatic and convenient. The user's existing electric water heaters can be connected in series as a hot water storage tank to increase the energy storage function.

[0035] 5. The first hot water heat exchanger described in the utility model adopts the design of a heat exchanger with a guide sleeve and a spiral coil installed in the hot water tank. Since the water in the guide sleeve is heated by the spiral coil heat exchanger and the temperature rises rapidly, the water outside the guide sleeve has not yet been heated. Due to the density difference between the water inside and outside the sleeve, self-reinforced thermal convection of the water inside and outside the guide sleeve is formed; therefore, in the summer cooling and hot water production mode, the hot water in the hot water tank can meet the demand by relying on self-circulation heat exchange, which saves the power consumption of forced circulation of hot water and simplifies the control.

[0036] 6. The most outstanding advantage of the four-season hot water unit for cooling in summer and heating in winter described in the utility model is that it has obvious energy-saving effect. It can perform cooling and hot water production at the same time in summer, and the obtained hot water is completely free. The longer the summer, the more benefits the area will get. In spring and autumn, the mode of absorbing heat from the outdoor to produce hot water saves 70-75% of electricity compared with electric water heaters. It has multi-mode energy-saving operation, and the defrosting mode in winter is effective and energy-saving. The annual average COP of the unit for hot water production is greater than 5.5.

[0037] To sum up, the summer cooling and winter heating four-season hot water unit described in the utility model has a clear and novel structure, a solid theoretical basis for innovative technology, powerful design functions, remarkable energy-saving effects, outstanding advancement, and obvious practicality, which meets the three requirements of invention patents. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is Embodiment 1 of the four-season hot water unit for summer cooling and winter heating of the present invention, which is a practical basic structure and an illustration of the fluorine circuit circulation and water circuit circulation for executing the hot water mode.

[0039] Figure 2 This is a diagram illustrating the operation of the fluorine circuit and the water circuit when the cooling mode and hot water production are combined in the first embodiment.

[0040] Figure 3 This is a diagram illustrating the operation of the fluorine circuit and the water circuit when the hot water heater in the heating 2 mode of the first embodiment is heating.

[0041] Figure 4 This is a diagram illustrating the operation of the fluorine circuit and the water circuit in the defrost mode of the first embodiment.

[0042] Figure 5 This is the second embodiment of the four-season hot water unit for summer cooling and winter heating of the utility model, which is an illustration of the basic structure of the advanced type and the fluorine circuit circulation and water circuit circulation for executing the hot water mode.

[0043] Figure 6 This is the third embodiment of the four-season hot water unit for summer cooling and winter heating of the utility model, which is an illustration of the simplified basic structure and the fluorine circuit circulation and water circuit circulation for executing the hot water mode.

[0044] Figure 7 This is Example 4 of the four-season hot water unit for summer cooling and winter heating of the utility model, which is an illustration of the extremely simplified basic structure and the fluorine circuit circulation and water circuit circulation for executing the hot water mode.

[0045] The present invention will be further described below in conjunction with the embodiments and the accompanying drawings, but the present invention is not limited thereto. DETAILED DESCRIPTION

[0046] Figure 1As shown, the embodiment 1 of the four-season hot water machine for summer cooling and winter heating of the utility model is a practical four-season hot water machine for summer cooling and winter heating, including a fluorine circuit system and a water circuit system, namely, a cold and warm water machine of the fluorine circuit and a hot water system of the water circuit; its characteristics are: the cold and warm water machine includes a compressor 1, a four-way valve 2, indoor and outdoor heat exchangers 3, 4, a first hot water heat exchanger 6, a second hot water heat exchanger 7, a first, second, third and fourth throttles J1, J2, J3, J4 of a four-way throttle, and a gas-liquid separator 5 is also used as a liquid storage device; the connection method of the cold and warm water machine is: the air outlet of the compressor 1 is divided into two paths, the first path is connected to the upper interface of the fluorine circuit air inlet of the first hot water heat exchanger 6 shown in the figure, and the second path is connected to the first interface of the four-way valve 2, namely Figure 1 The connection marked (①) in the middle; the fluorine outlet of the first hot water heat exchanger 6 is connected to the second interface of the outdoor and indoor air heat exchangers 3 and 4 by the first and second throttles J1 and J2 respectively; the second, third and fourth interfaces of the four-way valve 2, Figure 1 The (②, ③, ④ interfaces) marked in the figure are respectively connected to the first interfaces of the outdoor and indoor heat exchangers and the air inlet of the gas-liquid separator; the air inlet of the second hot water heat exchanger 7 is connected to the second interface of the indoor heat exchanger; the liquid outlet of the second hot water heat exchanger 7 is connected to the inlet of the third throttle J3 and the outlet of the fourth throttle J4 via the one-way valve D; the outlet of the third throttle J3 and the inlet of the fourth throttle J4 are connected to the second interface of the outdoor heat exchanger 3; the connected circuit is filled with refrigerant and has three functions and a defrosting cycle: in summer, the indoor heat exchanger cools the air, and the hot water heat exchanger also makes hot water circulation; in spring and autumn, the outdoor heat exchanger absorbs heat, and the hot water heat exchanger makes hot water circulation; in winter, the outdoor heat exchanger absorbs heat, the indoor heat exchanger heats the air, and the hot water heat exchanger makes hot water circulation; and a defrosting cycle;

[0047] The hot and cold water machine is divided into an indoor unit and an outdoor unit. Figure 1 The pipeline is connected by stop valves C1 and C2, and the indoor unit includes an indoor heat exchanger 4, an indoor fan 4a, a control system and a control panel, and the other parts belong to the outdoor unit and are placed outdoors.

[0048] The hot water system of the utility model of the four-season hot water unit for summer cooling and winter heating, see Figure 1 , which is composed of the water passages of the first and second hot water heat exchangers 6 and 7, a hot water circulation pump 8, a three-way valve 9, which is an electric or manual three-way valve with one inlet and two outlets, and a plurality of hot water heaters 11, a water inlet safety pressure relief valve 10, a water inlet and outlet valves 12 and 13 of the hot water heaters, a plurality of hot water taps 14, a tap water inlet valve Z1, a hot water pipe L1, a hot water heating pipe L2, a return pipe L3, and a hot water circulation pipe L4, forming three types of circulating water circuits: a self-circulating hot water exchange circuit; a forced circulation hot water exchange circuit; a heating circulation hot water exchange circuit; and a tap water top pressure hot water outlet method;

[0049] The self-circulating water exchange circuit, see Figure 2 , is a hot water tank with a built-in guide sleeve spiral coil hot water heat exchanger 6. The water inside and outside the guide sleeve in the hot water tank forms a circulating water path for enhanced natural convection heat transfer due to the density difference; it is used in the cooling and hot water making mode in summer; the hot water circulation pump 8 is stopped;

[0050] The forced circulation water exchange circuit is shown in Figure 1 , is a circulating water circuit connected in sequence by a hot water circulation pump 8, a second hot water heat exchanger 7, a first hot water heat exchanger 6, a first outlet of a three-way valve 9, a hot water circulation pipe L4, and a hot water circulation pump 8; when used in the hot water control mode in spring and autumn, the first and second hot water heat exchangers 6 and 7 are both involved in heat exchange, which strengthens heat exchange and improves unit efficiency and hot water output power; the hot water circulation pump 8 is in operation;

[0051] The heating circulation water exchange circuit is shown in Figure 3 , is a heating circulation water exchange circuit which is connected in sequence by a hot water circulation pump 8, a second hot water heat exchanger 7, a first hot water heat exchanger 6, a second outlet of a three-way valve 9, a hot water heating pipe L2, a plurality of hot water heaters 11, a return pipe L3, and a hot water circulation pump 8; it is used for hot water heating in winter, the hot water circulation pump 8 and the heating fan 11a are in operation, and the inlet and outlet valves 12 and 13 of the hot water heater are opened; it is responsible for transferring the heat obtained by the first and second hot water heat exchangers to the hot water heater to heat the room far away from the indoor unit;

[0052] The tap water top pressure hot water method is that the water inlet valve Z1 and the water inlet safety pressure relief valve 10 are installed on the bottom water inlet pipe of the hot water tank 6 of the first hot water heat exchanger; the water inlet valve is connected to the tap water pipe and is always in an open state; a number of hot water taps 14 are connected in parallel to the hot water supply pipe, and hot water can be used in any circulating water circuit as long as the tap is turned on; hot water is supplied by the tap water top pressure replenishment method; it is automatic and convenient; the tap water top pressure water discharge process: the tap water flows out through the water inlet valve Z1, the water inlet safety pressure relief valve 10, the first hot water heat exchanger 6, the hot water heating pipe L1, and the hot water tap 14;

[0053] The user's existing electric water heater can be connected in series between the water outlet of the first hot water heat exchanger and the inlet of the three-way valve to serve as an additional hot water storage tank to increase the energy storage function; the hot water tank is provided with an exhaust valve.

[0054] See also Figure 1 , 2 3. The four-season hot water machine for summer cooling and winter heating is characterized in that the four functional cycles of the cold and warm hot water machine cooperate with the three circulating water circuits of the hot water system to organize three functional operation modes: respectively referred to as hot water, cooling, and heating modes; the fluorine circuit circulation and heat exchange of the three modes are respectively introduced as follows:

[0055] Hot water mode is an independent hot water mode in spring and autumn; see Figure 1 , fluorine circuit circulation: the outlet of compressor 1 is divided into two circuits, the first fluorine circuit, through the first hot water heat exchanger 6 condensation heat release to make hot water, the first throttle J1, enter the outdoor heat exchanger 3 to evaporate and absorb outdoor heat; the second fluorine circuit, through the four-way valve 2 (①③ passages), the indoor heat exchanger 4 fan stops and there is no effective heat exchange, the second hot water heat exchanger 7 has circulating water refrigerant condensation heat release to make hot water, the third throttle J3, enters the outdoor heat exchanger 4 refrigerant evaporates and absorbs heat from the outdoor air; the refrigerant gas that absorbs heat and evaporates in the outdoor heat exchanger passes through the four-way valve 2 (②④ passages), the gas-liquid separator 5, and returns to the compressor 1 to complete the fluorine circuit circulation; the water circuit runs forced circulation heat exchange, the hot water circulation pump 8 runs, and the three-way valve 9 is at the first outlet position; circulating water circuit process: hot water circulation pump 8, the water circuits of the second and first hot water heat exchangers 7 and 6, the first interface position of the three-way valve 9, the hot water circulation pipe L4, returns to the hot water circulation pump 8;

[0056] Cooling mode is a summer cooling and hot water mode; see Figure 2 , fluorine circuit circulation: the outlet of compressor 1 is divided into two paths, the first fluorine circuit, through the first hot water heat exchanger 6, the refrigerant condenses and releases heat to make hot water, the second throttle J2, through the second hot water heat exchanger 7, there is no water flow and no heat exchange, and enters the indoor heat exchanger 4, the refrigerant evaporates and absorbs heat to cool the gas; the second fluorine circuit, through the four-way valve (①② passage), the outdoor heat exchanger 3 condenses and releases heat, the fourth throttle J4, the one-way valve D, the second hot water heat exchanger 7 has no water flow and no heat exchange, the refrigerant in the indoor heat exchanger 4 evaporates and absorbs heat to cool the gas, the four-way valve 2 (④③ passage), the gas-liquid separator 5, returns to the compressor 1, and the fluorine circuit circulation is completed; the water circuit executes: the first hot water heat exchanger is in self-circulation heat exchange mode, and the hot water circulation pump 8 stops;

[0057] The heating mode is a mode for heating and hot water in winter; Figure 3 It is a flow diagram of heating mode 2, fluorine circuit cycle: the outlet of compressor 1 is divided into two paths: the first fluorine path, through the first hot water heat exchanger 6 condensation heat release to make hot water, the first throttle J1, into the outdoor heat exchanger 3 evaporates and absorbs heat from the outdoor air; the second fluorine path, through the four-way valve 2 (①③ path), the indoor heat exchanger 4 indoor fan stops without heat exchange, the second hot water heat exchanger 7 condenses to make hot water, the third throttle J3, into the outdoor heat exchanger 3 refrigerant evaporates and absorbs heat from the outdoor air, The refrigerant gas collected in the outdoor heat exchanger 3 passes through the four-way valve 2 (②④ passages) and the gas-liquid separator 5, and returns to the compressor 1 for circulation; the water circuit performs heating cycle heat exchange, the hot water circulation pump 8 runs, and the three-way valve 9 is in the second outlet position; when the indoor fan 4a is running and the heating fan 11a is stopped, it is the hot air heating mode; when the indoor fan 4a is stopped and the heating fan 11a is running, it is the hot water heating mode; when both the indoor fan 4a and the heating fan 11a are running, it is the dual heating mode.

[0058] The summer cooling and winter heating four-season hot water unit, embodiment 1, see Figure 1 , which is characterized in that: the system is provided with: indoor and outdoor air temperatures T1, T2, indoor and outdoor heat exchanger pipe wall temperatures near the compressor port T3, T4, compressor suction and exhaust pipe port temperatures T5, T6, the outlet water temperature T7 of the first hot water heat exchanger, the upper hot water temperature T8 in the hot water tank, the inlet and outlet water temperatures T9, T10 of the hot water heater, the signal detection of the outlet air temperature T11 of the hot water heater, and the signal detection of the compressor current; air conditioner overcurrent protection and overheating protection are provided; the three functional modes of the summer cooling and winter heating four-season hot water unit: hot water, cooling, and heating adopt a combination of manual and automatic control methods, and the operating states and controls of the three functional modes are:

[0059] Hot water mode: Figure 1 The circuit structure position and fluorine and water flow diagram of the hot water mode; the difference △Tw between the hot water temperature Tw and the set water temperature Tw0 is used for automatic control; the default Tw0=45℃, the default maximum water temperature fluctuation allowable deviation △Ta0=5℃, and the default maximum safe water temperature Tw,max=52℃; the user manually presses the button, or voice control specifies the "hot water" mode. The user first confirms or modifies the set water temperature Tw0 value, which is limited to 40-45℃; when the "hot water" mode is specified, the four-way valve 2 is in the heating position coil off potential (①③, ②④ are connected), the three-way valve 9 is in the first outlet position, and it is agreed to be in the power-off state, and the unit enters the hot water mode standby state;

[0060] When Tw≤Tw0, the hot water production operation is automatically started, the compressor 1, the outdoor fan 3a, and the hot water circulation pump 8 are all running, and the indoor fan 4a is stopped (manually stopped or automatically stopped);

[0061] When Tw≥(Tw0+△Tw0), the hot water production operation is automatically stopped, the compressor 1, the outdoor fan 3a, and the hot water circulation pump 8 stop running, and the unit returns to the standby state of the hot water mode; when the hot water mode is to be exited, human intervention is adopted, that is, the "shutdown" button is touched;

[0062] Cooling mode: Figure 2 The circuit structure position and fluorine and water flow diagram of the cooling mode; the control is based on the difference △Ta between the indoor temperature Ta and the set room temperature Ta0, and the hot water temperature is not a control parameter; the default Ta0=26℃, the default maximum room temperature fluctuation allowable deviation △Ta0=2℃; the user manually presses the button or voice control to specify the "cooling" mode; the user first confirms or modifies the set room temperature Ta0 value, which is limited to the range of 22-28℃; when the "cooling mode" is specified, the four-way valve 2 is energized in the cooling position coil, the three-way valve 9 is de-energized in the first outlet position coil, the unit enters the cooling mode standby state, and the hot water circulation pump stops;

[0063] When the room temperature Ta≥Ta0, the cooling mode is automatically started, the compressor 1, indoor and outdoor fans 4a, 3a are immediately operated, the cooling air is mainly supplied, and the hot water self-circulation heat exchange of the first hot water heat exchanger 6 is used as a secondary hot water; when the cooling mode is running, the hot water temperature T8 of the hot water tank will exceed the maximum water temperature limit due to the heat received from the superheated gas, and it is left to nature;

[0064] When the room temperature Ta≤Ta0-△Ta0, the refrigeration stops automatically, the compressor 1 and the indoor and outdoor fans 4a, 3a all stop, and are in the refrigeration standby state;

[0065] When the compressor and fan used are variable frequency machines, the speed of the compressor and indoor and outdoor fans is the maximum value Vmax at the beginning, and the speed gradually decreases as the room temperature drops, and runs at the minimum maintenance speed close to Ta0;

[0066] Heating mode: Figure 3 The circuit structure position and fluorine and water flow diagram of heating mode 2; the control is based on the difference △Ta between the indoor temperature Ta and the set room temperature Ta0; start mode: the user manually presses the button, or voice control specifies the "heating" mode; when the heating mode is running, the user first confirms or modifies the set room temperature Ta0 value, and it is recommended to set the room temperature Ta0 = 22℃ not lower than the national heating standard indoor temperature of 18℃; when the "heating mode" is specified, the four-way valve 2 is disconnected from the heating position coil as shown (①③, ②④ are connected); the three-way valve 9 is energized at the second outlet position coil, and a manual three-way valve can be used, and the unit automatically enters the standby state;

[0067] When the room temperature Ta≤Ta0, the unit automatically starts the heating mode, starts the compressor 1, the outdoor fan 3a, and the hot water circulation pump 8. When the indoor heat exchanger tube wall temperature T3 is higher than the set temperature for starting the indoor fan, the default temperature is 45°C and the hot water temperature is higher than 45°C, the indoor fan and the heating fan are turned on and run at medium speed; manual intervention is adopted to start and stop the indoor fan and the heating fan and the speed, and the recommended output hot air temperature T11 is higher than the room temperature by 8°C as a reference indicator for adjusting the fan speed; when the indoor fan 3a is running and the heating fan 11a is stopped, it is the hot air heating mode; when the indoor fan is stopped and the heating fan is running, it is the hot water heating mode; when both the indoor fan and the heating fan are running, it is the hot air heating mode;

[0068] When Ta≥(Ta0+△Ta), heating stops automatically, the compressor, indoor and outdoor fans, hot water circulation pump, and heating fan all stop, and the system is in heating standby mode. To exit the heating mode, use manual “shutdown”.

[0069] When the compressor and fan are variable frequency machines, the speed of the compressor and indoor and outdoor fans is the maximum value Vmax at the beginning. As the room temperature rises, the speed gradually decreases and runs at the minimum maintenance speed close to Ta0.

[0070] Automatic mode control: hot water priority principle, that is, in the three modes of hot water, cooling and heating, the hot water mode is executed first, and then the cooling or heating mode is selected according to the comparison value between the room temperature and the default room temperature setting.

[0071] For the defrosting method of the summer cooling and winter heating four-season hot water unit, see Figure 4 The energy for defrosting the unit is provided by the hot water flowing through the second hot water heat exchanger 7 and the input power of the compressor 1; the defrosting operation is the key link to ensure the normal operation of the heating mode; starting conditions: in the heating mode, when the outdoor heat exchanger is severely frosted, that is, the temperature difference between the outdoor temperature and the outdoor heat exchanger tube wall temperature suddenly exceeds the set value, the control system issues a defrost command, and the unit enters the defrost mode: see Example 1 Figure 4 , the four-way valve 2 is in the cooling position, the coil is connected (①②, ③④ are connected), the compressor 1 and the hot water circulation pump 8 are running; the indoor fan 4a and the outdoor fan 3a are stopped; the three-way valve 9 is in the first outlet position; the fluorine circuit in the defrost mode: the compressor 1, the four-way valve 2 (①② passages), the outdoor heat exchanger 3, the condenser hot air condenses and defrosts, the fourth throttle J4, the one-way valve D, the second hot water heat exchanger 7 has hot flowing water to provide defrosting heat for refrigerant evaporation, the indoor heat exchanger 4, the fan 4a stops, there is no heat exchange, the four-way valve 2 (④③ passages), the gas-liquid separator 5, the compressor 1 inputs compression work, and the cycle repeats; when the outdoor heat exchanger tube wall temperature T4 recovers to exceed 8°C, it automatically switches to the heating mode; the three-way valve 9 is restored to the second outlet position.

[0072] Figure 5 This is Example 2 of the four-season hot water unit for summer cooling and winter heating of the utility model. It is an illustration of the basic structure of an advanced four-season hot water unit for summer cooling and winter heating and the fluorine circuit circulation and water circuit circulation for executing the hot water mode. The only difference from the practical type of Example 1 is that the first and third throttle devices use electronic expansion valves and the compressor is a variable frequency compressor.

[0073] Figure 6 This is Example 3 of the four-season hot water unit for summer cooling and winter heating of the utility model. It is a simple four-season hot water unit with basic structure and illustration of fluorine circuit circulation and water circuit circulation for hot water mode. The difference from the practical type of Example 1 is that no hot water heater heating system is configured, and the three-way valve of the water circuit is also cancelled, so there is only warm air heating mode in winter.

[0074] Figure 7This is Example 4 of the four-season hot water unit for summer cooling and winter heating of the utility model, which is an illustration of the basic structure of a minimalist air-conditioning and hot water heating unit and the fluorine circuit circulation and water circuit circulation for executing the hot water mode. The basic structure of the minimalist air-conditioning and hot water heating unit retains the core technology and basic functions of the air-conditioning and hot water heating units of Examples 1, 2, and 3; the core technology is embodied in the composition and connection method of the cold and warm water machine, and the specific constituent elements include: compressor 1, four-way valve 2, indoor and outdoor heat exchangers 3, 4, hot water heat exchange 6, throttle, gas-liquid separator 5; the characteristic lies in the connection method of the fluorine circuit, that is, the air outlet of the compressor 1 is divided into two circuits, the first circuit is connected to the first interface of the four-way valve 2; the second circuit is connected to the fluorine circuit air inlet of the first hot water heat exchanger 6 The fluorine circuit liquid outlet of the first hot water heat exchanger is connected to the second interface of the outdoor and indoor heat exchangers 3 and 4 as the liquid inlet by the first and second throttles J1 and J2 respectively; the second, third and fourth interfaces of the four-way 2 are respectively connected to the first interface of the outdoor heat exchange 3, the first interface of the indoor heat exchanger 4 and the air inlet of the gas-liquid separator 5; the second interfaces of the indoor and outdoor heat exchangers are interconnected by a two-way throttle composed of a third and fourth throttle + a one-way valve, and the connected circuit is filled with refrigerant; its fluorine circuit has: two hot water circulation circuits with the first hot water heat exchanger as the condenser and the indoor and outdoor heat exchangers as the evaporator, and a refrigeration and heating circuit with the indoor and outdoor heat exchangers as the evaporator and condenser; therefore, the unit has the functions of summer cooling, winter heating and four-season water heater.

Claims

1. A four-season hot water unit for cooling in summer and heating in winter, including a hot and cold water machine and a hot water system of a fluorine circuit system; the hot and cold water machine includes a compressor, a four-way valve, indoor and outdoor heat exchangers, a hot water heat exchanger, a throttle, and a gas-liquid separator; its characteristics are: The hot water heat exchanger of the hot and cold water machine comprises a first hot water heat exchanger and a second hot water heat exchanger, the first hot water heat exchanger is a hot water heat exchanger integrated with a hot water tank, and the second hot water heat exchanger has the functions of making hot water and providing heat for defrosting; the throttle comprises a first, a second, a third and a fourth throttle; the connection method of the hot and cold water machine is as follows: the air outlet of the compressor is divided into two paths, the first path is connected to the fluorine path air inlet of the first hot water heat exchanger, and the second path is connected to the first interface of the four-way valve; the fluorine path liquid outlet of the first hot water heat exchanger is connected to the second interfaces of the outdoor and indoor heat exchangers respectively by the first and second throttles; the second, third and fourth interfaces of the four-way valve are connected to the first interfaces of the outdoor and indoor heat exchangers respectively. The air inlet of the second hot water heat exchanger is connected to the second interface of the indoor heat exchanger; the liquid outlet of the second hot water heat exchanger is connected to the inlet of the third throttle and the outlet of the fourth throttle via the one-way valve D; the outlet of the third throttle and the inlet of the fourth throttle are connected to the second interface of the outdoor heat exchanger; the connected loop is filled with refrigerant and has three functional cycles: in summer, the indoor heat exchanger cools the air and the first hot water heat exchanger also makes hot water; in spring and autumn, the outdoor heat exchanger absorbs heat and the first and second hot water heat exchangers make hot water; in winter, the outdoor heat exchanger absorbs heat, the indoor heat exchanger heats the air, and the first and second hot water heat exchangers make hot water for hot water heating; and defrost cycles.

2. The four-season hot water unit for cooling in summer and heating in winter according to claim 1 is characterized by: The hot water system is composed of a hot water circulation pump, water circuits of the first and second hot water heat exchangers, a three-way valve, a hot water heater, a hot water circulation pipe, a hot water heating pipe, a hot water pipe, a return pipe, a water inlet valve, a water inlet safety pressure relief valve, and a hot water faucet. There are three types of hot water exchange circuits: a self-circulating hot water exchange circuit, a forced circulation hot water exchange circuit, and a heating circulation water circuit; the hot water is discharged by pressing out tap water; The self-circulating hot water exchange circuit is a self-circulating hot water exchange circuit for water in the hot water tank of the first hot water heat exchanger; it does not require a hot water circulation pump to operate and can be used in a cooling and hot water production mode in summer; The forced circulation water exchange circuit is a circulation water circuit connected in sequence by a hot water circulation pump, a second hot water heat exchanger, a first hot water heat exchanger, a first outlet of a three-way valve, a hot water circulation pipe, a return pipe, and a hot water circulation pump; The hot water circulation pump is running and is used in hot water mode in spring and autumn; The heating circulation water exchange circuit is composed of a hot water circulation pump, a second hot water heat exchanger, a first hot water heat exchanger, a second outlet of a three-way valve, a hot water heating pipe, a plurality of hot water heating fans in parallel, a return pipe, a hot water circulation pump, and a heating circulation water circuit connected in sequence by connecting water pipes; the hot water circulation pump and the heating fan are both running, and are used for hot water heating in winter; The method of using tap water to pressurize hot water is composed of a water inlet valve, a water inlet safety pressure relief valve, a first hot water heat exchanger, a hot water pipe and a plurality of hot water faucets connected in parallel; the water inlet valve connected to the tap water pipe is always in an open state, and hot water can be used no matter what the circulating water state is as long as the faucet is turned on.

3. The four-season hot water unit for cooling in summer and heating in winter according to claim 1 is characterized by: The three functional cycles of the cold and hot water machine cooperate with the three heat exchange circulation water circuits of the hot water system to perform three functional modes of operation: respectively referred to as: hot water, cooling, and heating modes; the fluorine circuit circulation, water circuit operation mode, and heat exchange of the three modes are respectively introduced as follows: Hot water mode is an independent hot water production mode in spring and autumn; fluorine circuit circulation: the compressor outlet is divided into two circuits, the first fluorine circuit, through the first hot water heat exchanger condenses and releases heat to make hot water, the first throttle, enters the outdoor heat exchanger to evaporate and absorb heat from the outdoor air; the second fluorine circuit, through the four-way valve and the indoor heat exchanger, there is no effective heat exchange due to the indoor fan stopping, the second hot water heat exchanger condenses and releases heat to make hot water, the third throttle, enters the outdoor heat exchanger to evaporate and absorb heat; the refrigerant gas merged in the two circuits passes through the four-way valve and the gas-liquid separator and returns to the compressor to complete the fluorine circuit circulation; The hot water circulation pump is running, and the three-way valve is in the first outlet position, operating as a forced circulation hot water exchange circuit; The cooling mode is a summer cooling and hot water mode; fluorine circuit circulation: the compressor outlet is divided into two circuits, the first fluorine circuit, through the first hot water heat exchanger condensation heat exchange to make hot water, the second throttle, into the indoor heat exchanger evaporation heat absorption cooling gas; the second fluorine circuit, through the four-way valve, the outdoor heat exchanger condensation heat release, the fourth throttle, the one-way valve D, the second hot water heat exchanger because there is no water flow and no heat exchange, the indoor heat exchanger evaporates heat absorption cooling gas, the four-way valve, the gas-liquid separator, back to the compressor, complete the fluorine circuit cycle; the water in the hot water tank of the first hot water heat exchanger self-circulates heat exchange, the hot water circulation pump stops; The heating mode is a mode for heating air and hot water in winter; fluorine circuit circulation: the outlet of the compressor is divided into two routes, the first fluorine circuit, condenses and releases heat to make hot water through the first hot water heat exchanger, and enters the outdoor heat exchanger to absorb heat through the first throttle; the second fluorine circuit, through the four-way valve, the indoor heat exchanger dissipates heat and produces hot air when the fan is turned on, and when the fan is stopped, there is no effective heat exchange and no hot air is blown, the second hot water heat exchanger condenses and releases heat to make hot water, and enters the outdoor heat exchanger to absorb heat and evaporate through the third throttle; the refrigerant gas merged in the two routes passes through the four-way valve and the gas-liquid separator and returns to the compressor to complete the fluorine circuit circulation; the water circuit performs heating cycle heat exchange, the hot water circulation pump runs, and the three-way valve is in the second outlet position; heating mode 1 is a hot air heating mode, the indoor fan runs, and the heating fan stops; heating mode 2 is a hot water heater heating mode, the indoor fan stops, and the heating fan runs; heating mode 3 is a hot air and hot water combined heating mode, and both the indoor fan and the heating fan run.

4. The four-season hot water unit for cooling in summer and heating in winter according to claim 1 is characterized by: The system is equipped with: indoor and outdoor air temperature, pipe wall temperature of indoor and outdoor heat exchangers near the compressor port, suction and exhaust pipe port temperature of the compressor, outlet water temperature of the first hot water heat exchanger, hot water temperature at the middle position of the hot water tank, inlet and outlet water temperature of the hot water heater, outlet air temperature of the hot water heater, and signal detection of compressor current; air conditioner overcurrent protection and overheating protection are provided; the three functional modes of the summer cooling and winter heating four-season hot water unit: hot water, cooling, and heating adopt a combination of manual and automatic control methods, and the operating states and controls of the three functional modes are: Hot water mode: automatic control based on the difference △Tw between the hot water temperature Tw and the set water temperature Tw0; default Tw0=45℃, default maximum water temperature fluctuation allowable deviation △Ta0=5℃, default maximum safe water temperature Tw,max=52℃; user manually presses the button or voice control to specify "hot water" mode. The user first confirms or modifies the set water temperature Tw0 value, which is limited to 40-45℃; when the "hot water" mode is specified, the four-way valve is in the heating position, the three-way valve is in the first outlet position, and the power is off by default, and the unit enters the hot water mode standby state; When Tw≤Tw0, the hot water production will start automatically, the compressor, outdoor fan and hot water circulation pump will all run, and the indoor fan will stop, either manually or automatically. When Tw≥Tw0+△Tw0, the hot water production will stop automatically, the compressor, outdoor fan and hot water circulation pump will stop running, and the unit will return to the standby state of hot water mode; to exit the hot water mode, human intervention is adopted, that is, the "shutdown" button is touched; Cooling mode: Control is performed based on the difference △Ta between the indoor temperature Ta and the set room temperature Ta0, and the hot water temperature is not a control parameter; the default Ta0=26℃, the default maximum room temperature fluctuation allowable deviation △Ta0=2℃; the user manually presses the button or voice control to specify the "cooling" mode; the user first confirms or modifies the set room temperature Ta0 value, which is limited to the range of 22-28℃; when the "cooling mode" is specified, the four-way valve is energized in the cooling position coil, the three-way valve is de-energized in the first outlet position coil, the unit enters the cooling mode standby state, and the hot water circulation pump stops; When the room temperature Ta≥Ta0, the cooling mode is automatically started, and the compressor, indoor and outdoor fans are immediately running, supplying cooling air as the main function, and the hot water self-circulation heat exchange of the first hot water heat exchanger as the secondary function; when the cooling mode is running, the water temperature of the hot water tank will exceed the maximum water temperature limit due to the heat received from the superheated air, and it is left to nature; When the room temperature Ta≤Ta0-△Ta0, the refrigeration stops automatically, the compressor and the indoor and outdoor fans stop, and the machine is in the refrigeration standby state; When the compressor and fan used are variable frequency machines, the speed of the compressor and indoor and outdoor fans is the maximum value Vmax at the beginning, and the speed gradually decreases as the room temperature drops, and runs at the minimum maintenance speed close to Ta0; Heating mode: controlled by the difference △Ta between the indoor temperature Ta and the set room temperature Ta0; start mode: user manually presses the button, or voice control specifies the "heating" mode; when the heating mode is running, the user first confirms or modifies the set room temperature Ta0 value, and it is recommended to set the room temperature Ta0=22℃ not lower than the national heating standard indoor temperature of 18℃; when the "heating mode" is specified, the four-way valve is de-energized in the heating position coil; the three-way valve is energized in the second outlet position coil, and the unit automatically enters the standby state; When the room temperature Ta≤Ta0, the unit automatically starts the heating mode, starts the compressor, outdoor fan, and hot water circulation pump. When the indoor heat exchanger tube wall temperature is higher than the set temperature for starting the indoor fan, which is 45℃ by default, and the hot water temperature is higher than 45℃, the indoor fan and heating fan are turned on and run at medium speed; manual intervention is adopted to start and stop the indoor fan and heating fan and the speed, and the recommended output hot air temperature is 8℃ higher than the room temperature as the indicator for adjusting the fan speed; when the indoor fan is running and the heating fan is stopped, it is the hot air heating mode; when the indoor fan is stopped and the heating fan is running, it is the hot water heating mode; when both the indoor fan and the heating fan are running, it is the hot air heating mode; When Ta≥Ta0+△Ta, heating stops automatically, the compressor, indoor and outdoor fans, hot water circulation pump, and heating fan all stop, and the system is in heating standby mode. To exit the heating mode, use manual "shutdown"; When the compressor and fan are variable frequency machines, the speed of the compressor and indoor and outdoor fans is the maximum value Vmax at the beginning. As the room temperature rises, the speed gradually decreases and runs at the minimum maintenance speed close to Ta0. Automatic mode control: implement the hot water priority principle, that is, in the three modes of hot water, cooling and heating, the hot water mode is implemented first, and then the cooling or heating mode is selected according to the comparison value between the room temperature and the default room temperature setting.

5. The four-season hot water unit for cooling in summer and heating in winter according to claim 1 is characterized by: The defrosting energy of the four-season hot water unit for cooling in summer and heating in winter is provided by the hot water flowing through the second hot water heat exchanger and the input work of the compressor; Start-up conditions: When the outdoor temperature is lower than 5℃ during the heating mode, the temperature difference between the outdoor air temperature and the outdoor heat exchanger tube wall temperature suddenly exceeds the set value; or the outdoor heat exchanger tube wall temperature suddenly drops rapidly, and the drop rate exceeds 1 times the normal drop rate, the control system issues a defrost command and enters the defrost mode: the four-way valve is in the cooling position, that is, the coil is on, the compressor and the hot water circulation pump are running; the indoor fan and the outdoor fan are stopped; the three-way valve is in the first outlet position; the hot water circulation operation is executed; the fluorine circuit in the defrost mode: the compressor, the four-way valve, the outdoor heat exchanger is equivalent to the condenser hot air condensation defrosting, the fourth throttle, the one-way valve, the second hot water heat exchanger has hot water to provide heat for refrigerant evaporation, the indoor heat exchanger fan does not rotate and there is no heat exchange, the four-way valve, the gas-liquid separator, and the compressor input compression work; when the outdoor heat exchanger tube wall temperature recovers to exceed 8℃, it automatically switches to the heating mode, the three-way valve returns to the second outlet position, and the hot water heating cycle is restored.

6. The four-season hot water unit for cooling in summer and heating in winter according to claim 1 is characterized by: The first hot water heat exchanger is an integrated hot water heat exchanger of a hot water tank and a hot water heat exchanger. The hot water tank is equipped with a guide sleeve and a spiral coil. The diameter of the guide sleeve is 20-40 mm larger than the outer diameter of the spiral coil, and the top and bottom of the guide sleeve are 5-10 cm away from the top and bottom of the hot water tank. The first hot water heat exchanger is a fluorine water plate heat exchanger or a sleeve-type heat exchanger.

7. The four-season hot water unit for cooling in summer and heating in winter according to claim 1 is characterized by: The four-season hot water unit for cooling in summer and heating in winter has several designs, including advanced, practical, simple and minimalist, according to the climate differences between the north and the south. For the advanced type, its compressor is a variable frequency compressor, and its first and third throttles are electronic expansion valves. Its control method is equipped with voice control and remote intelligent control system, and it runs automatically and continuously. For the practical type, its compressor is a fixed frequency or variable frequency compressor, and its first, second, third and fourth throttles are capillaries. Its three-way valve is a manual three-way valve, and the operating mode is manually selected, and an automatic mode is available. For the simple type, no hot water heater heating system is configured. For the minimalist type, the second hot water heat exchanger and the hot water circulation pump are cancelled, and only the water in the hot water tank with integrated hot water heat exchanger is relied on for self-convection heat exchange, and the functions of cooling, heating and hot water are simply retained.

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