CN219283480U

CN219283480U - Air conditioning system

Info

Publication number: CN219283480U
Application number: CN202223457407.6U
Authority: CN
Inventors: 崔天伟; 王潇君; 熊硕; 龚雪武; 韦华明; 杜宗雄
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2022-12-22
Filing date: 2022-12-22
Publication date: 2023-06-30
Anticipated expiration: 2032-12-22

Abstract

The utility model provides an air conditioning system, which comprises a water tank, wherein the water tank is provided with a heat exchange structure, a control valve is provided with four ports, an exhaust port of a compressor is communicated with a first port, an air suction port is communicated with a second port, an indoor heat exchanger, an outdoor heat exchanger and a first throttling element are all arranged on a first flow path, the first end of the first flow path is communicated with a third port, the second end of the first flow path is communicated with a fourth port, the heat exchange structure and the second throttling element are all arranged on a second flow path, and two ends of the second flow path are all communicated with the first flow path. According to the utility model, the water tank is connected with the outdoor heat exchanger in parallel, so that the high-temperature and high-pressure refrigerant discharged by the compressor can be divided into two parts, wherein one part sequentially flows through related parts of the air conditioning system, and the normal refrigeration of the air conditioner is ensured. The other part of high-temperature high-pressure refrigerant flows through the heat exchange structure of the water tank, and water in the water tank is heated in a heat exchange mode, so that the air conditioning system has the functions of refrigerating and heating water.

Description

Air conditioning system

Technical Field

The utility model belongs to the technical field of air conditioners, and particularly relates to an air conditioning system.

Background

In summer, at night, a user needs to use an air conditioner for refrigeration and use hot water for bathing, so that the air conditioner is required to refrigerate and heat water simultaneously, and the current air conditioner has no function of refrigerating and heating water simultaneously.

Disclosure of Invention

Therefore, the utility model provides an air conditioning system which can overcome the defect that the existing air conditioner does not have the functions of simultaneously refrigerating and heating water.

In order to solve the above problems, the present utility model provides an air conditioning system comprising: the heat exchange device comprises a compressor, a control valve, an indoor heat exchanger, an outdoor heat exchanger, a first throttling element, a second throttling element and a water tank, wherein the water tank is provided with a heat exchange structure, the control valve is provided with a first port, a second port, a third port and a fourth port, an exhaust port of the compressor is communicated with the first port, an air suction port of the compressor is communicated with the second port, the indoor heat exchanger, the outdoor heat exchanger and the first throttling element are all arranged on a first flow path, a first end of the first flow path is communicated with the third port, a second end of the first flow path is communicated with the fourth port, the heat exchange structure and the second throttling element are all arranged on a second flow path, two ends of the second flow path are communicated with the first flow path, the first end of the second flow path is positioned between the first end of the first flow path and the outdoor heat exchanger, and the second end of the second flow path is positioned between the first throttling element and the indoor heat exchanger.

In some embodiments, the control valve is a four-way valve having a first state, the first port and the third port communicating within the four-way valve and the second port and the fourth port communicating within the four-way valve when the four-way valve is in the first state.

In some embodiments, the second flow path is further provided with a first three-way valve and a second three-way valve, the first three-way valve being between the heat exchange structure and the first end of the second flow path, the first three-way valve having a fifth port, a sixth port, and a seventh port, the fifth port, the sixth port each being in communication with the second flow path, and a third flow path, the first end of the third flow path being in communication with the seventh port, the second end of the third flow path being in communication with the first flow path, and the second end of the third flow path being between the indoor heat exchanger and the second end of the first flow path; the second three-way valve is positioned between the second throttling element and the second end of the second flow path, the second three-way valve is provided with an eighth port, a ninth port and a tenth port, the eighth port and the ninth port are communicated with the second flow path, the second three-way valve further comprises a fourth flow path, the first end of the fourth flow path is communicated with the tenth port, the second end of the fourth flow path is communicated with the first flow path, and the second end of the fourth flow path is positioned between the outdoor heat exchanger and the first throttling element.

In some embodiments, the sixth port is proximate to the first end of the second flow path relative to the fifth port, the first three-way valve having a second state, the fifth port and seventh port communicating within the first three-way valve when the first three-way valve is in the second state; the ninth port is adjacent to the second end of the second flow path relative to the eighth port, the second three-way valve having a third state, the eighth port and the tenth port communicating within the second three-way valve when the second three-way valve is in the third state.

In some embodiments, the first three-way valve further has a fifth state, the fifth port and sixth port being in communication within the first three-way valve when the first three-way valve is in the fifth state; the second three-way valve also has a sixth state, the eighth port and the ninth port communicating within the second three-way valve when the second three-way valve is in the sixth state.

In some embodiments, the four-way valve further has a fourth state, the first port and fourth port communicating within the four-way valve and the second port and third port communicating within the four-way valve when the four-way valve is in the fourth state.

In some embodiments, a gas-liquid separator is further disposed between the suction port and the second port of the compressor, the gas-liquid separator having an inlet in communication with the second port and an outlet in communication with the suction port of the compressor.

In some embodiments, the heat exchange structure is a heat exchange coil.

The utility model provides an air conditioning system, wherein a water tank is connected with an outdoor heat exchanger in parallel, so that a high-temperature and high-pressure refrigerant discharged by a compressor can be divided into two parts, wherein one part flows through the outdoor heat exchanger, a first throttling element and an indoor heat exchanger in sequence and finally returns to the compressor, and the normal refrigeration of the air conditioning system is ensured. The other part of high-temperature high-pressure refrigerant flows through the heat exchange structure of the water tank, and water in the water tank is heated in a heat exchange mode, so that the air conditioning system has the functions of refrigerating and heating water, and the requirements of refrigerating and bathing of an air conditioner in summer can be met.

Drawings

Fig. 1 is a schematic diagram of an air conditioning system according to an embodiment of the present utility model when operating in a heat storage+refrigeration mode;

FIG. 2 is a schematic diagram of an air conditioning system according to an embodiment of the present utility model when operating in a cold storage + cooling mode;

FIG. 3 is a schematic diagram of an air conditioning system according to an embodiment of the present utility model when operating in a heat absorption+heating mode;

fig. 4 is a schematic diagram of an air conditioning system according to an embodiment of the present utility model when the air conditioning system is operated in an exothermic + heating mode.

The reference numerals are expressed as:

1. a compressor; 2. a four-way valve; 3. an indoor heat exchanger; 4. an outdoor heat exchanger; 5. a first throttling element; 6. a second throttling element; 7. a water tank; 8. a first flow path; 9. a second flow path; 10. a first three-way valve; 11. a second three-way valve; 12. a third flow path; 13. a fourth flow path; 14. a gas-liquid separator.

Detailed Description

Referring to fig. 1 to 4 in combination, according to an embodiment of the present utility model, there is provided an air conditioning system including: the heat exchange device comprises a compressor 1, a control valve, an indoor heat exchanger 3, an outdoor heat exchanger 4, a first throttling element 5, a second throttling element 6 and a water tank 7, wherein the water tank 7 is provided with a heat exchange structure, the control valve is provided with a first port, a second port, a third port and a fourth port, an exhaust port of the compressor 1 is communicated with the first port, an air suction port of the compressor 1 is communicated with the second port, the indoor heat exchanger 3, the outdoor heat exchanger 4 and the first throttling element 5 are all arranged on a first flow path 8, a first end of the first flow path 8 is communicated with the third port, a second end of the first flow path 8 is communicated with the fourth port, the heat exchange structure and the second throttling element 6 are all arranged on a second flow path 9, two ends of the second flow path 9 are all communicated with the first flow path 8, the first end of the second flow path 9 is arranged between the first end of the first flow path 8 and the outdoor heat exchanger 4, and the second end of the second flow path 9 is arranged between the second throttling element 5 and the indoor heat exchanger 3. In the technical scheme, the water tank 7 is connected with the outdoor heat exchanger 4 in parallel, so that the high-temperature and high-pressure refrigerant discharged by the compressor 1 can be divided into two parts, one part of the refrigerant flows through the outdoor heat exchanger 4, the first throttling element 5 and the indoor heat exchanger 3 in sequence, and finally returns to the compressor 1, so that the normal refrigeration of an air conditioning system is ensured. The other part of high-temperature high-pressure refrigerant flows through the heat exchange structure of the water tank 7, and the water in the water tank 7 is heated in a heat exchange mode, so that the air conditioning system has the functions of refrigerating and heating water, and the requirements of refrigerating and bathing of the air conditioner in summer can be met.

As shown in fig. 1, the control valve is a four-way valve 2, the four-way valve 2 is provided with a valve core, and the four-way valve 2 controls the communication condition of each port through the valve core. The four-way valve 2 has a first state in which the first port communicates with the third port in the four-way valve 2 and the second port communicates with the fourth port in the four-way valve 2 when the four-way valve 2 is in the first state. At this time, the high-temperature and high-pressure refrigerant discharged from the discharge port of the compressor 1 enters the first port of the four-way valve 2, and then flows out of the third port of the four-way valve 2 and enters the first flow path 8. When the refrigerant reaches the first junction of the first flow path 8 and the second flow path 9, it is divided into two paths in parallel. The first path of refrigerant flows through the outdoor heat exchanger 4, then enters the first throttling element 5 to throttle, the second path of refrigerant flows through the heat exchange structure of the water tank 7 to heat water in the water tank 7, the heat exchanged refrigerant flows into the second throttling element 6 to throttle, and then the two paths of refrigerant are converged at the second junction of the first flow path 8 and the second flow path 9. The collected refrigerant flows through the indoor heat exchanger 3 to realize the refrigeration of the air conditioning system, then flows into the fourth port of the four-way valve 2, flows out of the second port of the four-way valve 2, and finally returns to the compressor 1 to complete the refrigerant circulation.

Specifically, when the air conditioning system is refrigerating, if the outdoor temperature is higher, the outdoor heat exchange temperature difference becomes smaller, and the outdoor heat exchange capacity is reduced, so that the heat exchange effect is deteriorated. To improve this, a first three-way valve 10 and a second three-way valve 11 are further provided on the second flow path 9, the first three-way valve 10 being between the heat exchange structure and the first end of the second flow path 9, the first three-way valve 10 having a fifth port, a sixth port, and a seventh port, the fifth port, the sixth port each being in communication with the second flow path 9, the air conditioning system further comprising a third flow path 12, the first end of the third flow path 12 being in communication with the seventh port, the second end of the third flow path 12 being in communication with the first flow path 8, and the second end of the third flow path 12 being between the indoor heat exchanger 3 and the second end of the first flow path 8; the second three-way valve 11 is located between the second throttling element 6 and the second end of the second flow passage 9, the second three-way valve 11 has an eighth port, a ninth port and a tenth port, both of which communicate with the second flow passage 9, the air conditioning system further includes a fourth flow passage 13, a first end of the fourth flow passage 13 communicates with the tenth port, a second end of the fourth flow passage 13 communicates with the first flow passage 8, and a second end of the fourth flow passage 13 is located between the outdoor heat exchanger 4 and the first throttling element 5. The addition of the first three-way valve 10, the second three-way valve 11, the third flow path 12 and the fourth flow path 13 can guide the flow direction of the refrigerant, thereby improving the situation. The method comprises the following steps: when the outdoor temperature is lower at night, the heat exchange structure of the water tank 7 and the indoor heat exchanger 3 are in parallel connection, the indoor heat exchanger 3 is used for refrigerating, and meanwhile, a part of low-temperature refrigerant flows into the heat exchange structure of the water tank 7, and the water in the water tank 7 is cooled in a heat exchange mode; when the outdoor temperature is higher in daytime, the heat exchange structure of the water tank 7 and the outdoor heat exchanger 4 are in parallel connection to work while the air conditioning system is refrigerated, one part of high-temperature and high-pressure refrigerant discharged from the exhaust port of the compressor 1 flows through the outdoor heat exchanger 4, and the other part flows through the heat exchange structure of the water tank 7, and because the water temperature in the water tank 7 is lower at the moment, the heat exchange temperature difference is larger, the heat exchange effect is good, and the high-temperature refrigerating capacity can be improved.

Referring to fig. 2 in combination, the sixth port is adjacent to the first end of the second flow path 9, the first three-way valve 10 has a second state, and when the first three-way valve 10 is in the second state, the fifth port communicates with the seventh port within the first three-way valve 10; the ninth port is close to the second end of the second flow path 9 with respect to the eighth port, and the second three-way valve 11 has a third state, and when the second three-way valve 11 is in the third state, the eighth port communicates with the tenth port in the second three-way valve 11. When the four-way valve 2 is in the first state, the first three-way valve 10 is in the second state, and the second three-way valve 11 is in the third state, the high-temperature and high-pressure refrigerant discharged from the exhaust port of the compressor 1 enters from the first port of the four-way valve 2, flows out from the third port of the four-way valve 2 and enters the first flow path 8, and then flows through the outdoor heat exchanger 4. When the refrigerant reaches the junction of the first flow path 8 and the fourth flow path 13, it is split into two paths in parallel. The first path of refrigerant enters the first throttling element 5 to be throttled, and then flows through the outdoor heat exchanger 4 to realize the refrigeration of the air conditioning system. The second path of refrigerant enters the fourth flow path 13, then flows into the tenth port of the second three-way valve 11, flows out of the eighth port of the second three-way valve 11 and enters the second throttling element 6 to throttle, when the throttled low-temperature refrigerant flows through the heat exchange structure of the water tank 7, the water in the water tank 7 is cooled in a heat exchange mode, the heat exchanged refrigerant flows into the fifth port of the first three-way valve 10, and then flows out of the seventh port of the first three-way valve 10 and enters the third flow path 12. Then the two paths of refrigerants are collected at the junction of the first flow path 8 and the third flow path 12, the collected refrigerants flow into the fourth port of the four-way valve 2, flow out of the second port of the four-way valve 2 and finally return to the compressor 1, so that the water in the water tank is cooled while the air conditioning system is refrigerating at night.

In the present embodiment, the first three-way valve 10 also has a fifth state, and when the first three-way valve 10 is in the fifth state, the fifth port and the sixth port communicate within the first three-way valve 10; the second three-way valve 11 also has a sixth state, and the eighth port and the ninth port communicate within the second three-way valve 11 when the second three-way valve 11 is in the sixth state. When the outdoor temperature is higher in daytime after cooling the water in the water tank 7 at night, the water tank 7 is utilized as a condenser to absorb heat through the water with lower temperature, so that the condensation temperature is greatly reduced, the heat exchange capacity is improved, and the aim of improving the high-temperature refrigerating capacity is fulfilled. The method comprises the following steps: when the four-way valve 2 is in the first state, the first three-way valve 10 is in the fifth state, and the second three-way valve 11 is in the sixth state, the high-temperature and high-pressure refrigerant discharged from the exhaust port of the compressor 1 enters the first port of the four-way valve 2, and then flows out of the third port of the four-way valve 2 and enters the first flow path 8. When the refrigerant reaches the first junction of the first flow path 8 and the second flow path 9, it is divided into two paths in parallel. The first path of refrigerant flows through the outdoor heat exchanger 4, then enters the first throttling element 5 to be throttled, the second path of refrigerant flows through the heat exchange structure of the water tank 7, low-temperature water in the water tank 7 condenses the high-temperature and high-pressure refrigerant, high-temperature refrigerating capacity is improved, the heat-exchanged refrigerant flows into the second throttling element 6 to be throttled, the throttled refrigerant flows into the eighth port of the second three-way valve 11, and then flows out of the ninth port of the second three-way valve 11. The two coolant paths then converge at the second junction of the first flow path 8 and the second flow path 9. The collected refrigerant flows through the indoor heat exchanger 3 to realize the refrigeration of the air conditioning system, then flows into the fourth port of the four-way valve 2, flows out of the second port of the four-way valve 2, and finally returns into the compressor 1 to complete the refrigerant circulation, thereby realizing the purposes of absorbing heat by using low-temperature water in the water tank and improving the high-temperature refrigeration capacity while the air conditioning system is refrigerating in the daytime when the outdoor temperature is higher. The flow direction of the refrigerant in the process is the same as that of the refrigerant when the air conditioning system refrigerates and heats water in the water tank, and reference is made to fig. 1.

As a specific embodiment, the four-way valve 2 further has a fourth state, and when the four-way valve 2 is in the fourth state, the first port and the fourth port communicate in the four-way valve 2, and the second port and the third port communicate in the four-way valve 2. When the air conditioning system heats, the outdoor heat exchanger 4 evaporates and absorbs heat, and when the outdoor temperature is low, the heat transfer temperature difference is small, and the heating effect is poor. Therefore, when the outdoor temperature is higher in daytime, the water tank is heated and stored, and when the night temperature is reduced, the water tank absorbs heat, so that the low-temperature heating quantity is improved. The method comprises the following steps: when the four-way valve 2 is in the fourth state, the first three-way valve 10 is in the second state, and the second three-way valve 11 is in the third state, the high-temperature and high-pressure refrigerant discharged from the exhaust port of the compressor 1 enters from the first port of the four-way valve 2, flows out from the fourth port of the four-way valve 2 and enters the first flow path 8, and when the refrigerant reaches the junction of the first flow path 8 and the third flow path 12, the refrigerant is divided into two paths in parallel. The first path of refrigerant flows through the indoor heat exchanger 3 to realize air conditioning heat, and then enters the first throttling element 5 to be throttled. The second refrigerant enters the third flow path 12, flows into the seventh port of the first three-way valve 10, flows out of the fifth port of the first three-way valve 10 and enters the second flow path 9, flows through the heat exchange structure of the water tank 7, heats water in the water tank 7 in a heat exchange mode, enters the second throttling element 6 to throttle, and the throttled low-temperature refrigerant flows into the eighth port of the second three-way valve 11, flows out of the tenth port of the second three-way valve 11 and enters the fourth flow path 13. Next, the two paths of refrigerants are collected at the junction of the first flow path 8 and the fourth flow path 13, the collected refrigerants flow through the outdoor heat exchanger 4, then enter the third port of the four-way valve 2, flow out of the second port of the four-way valve 2, and finally return to the compressor 1, so that when the outdoor temperature is high in daytime, the air conditioning system heats and stores energy while the water tank is heated, as shown in fig. 3. When the four-way valve 2 is in the fourth state, the first three-way valve 10 is in the fifth state, and the second three-way valve 11 is in the sixth state, the high-temperature and high-pressure refrigerant discharged from the exhaust port of the compressor 1 enters from the first port of the four-way valve 2, flows out from the fourth port of the four-way valve 2 and enters the first flow path 8, and then flows through the indoor heat exchanger 3, so that air conditioning and heating are realized. When the refrigerant reaches the second junction of the first flow path 8 and the second flow path 9, it is divided into two paths in parallel. The first path of refrigerant enters the first throttling element 5 to be throttled, and then flows through the outdoor heat exchanger 4. The second path enters the second flow path 9, then flows into a ninth port of the second three-way valve 11, flows out of an eighth port of the second three-way valve 11 and enters the second throttling element 6 to be throttled, and the throttled low-temperature refrigerant flows through a heat exchange structure of the water tank 7, absorbs heat from hot water in the water tank 7 in a heat exchange mode, so that the low-temperature heating capacity is improved. The refrigerant after heat exchange flows into the fifth port of the first three-way valve 10 and flows out of the sixth port of the first three-way valve 10. Then, the two paths of refrigerants are collected at the first junction of the first flow path 8 and the second flow path 9, the collected refrigerants enter the third port of the four-way valve 2, flow out of the second port of the four-way valve 2, and finally return to the compressor 1 to complete refrigerant circulation, so that when outdoor temperature at night is reduced, the air conditioning system heats and absorbs heat from the water tank at the same time, and the low-temperature heating quantity is improved.

Further, a gas-liquid separator 14 is further provided between the suction port of the compressor 1 and the second port of the four-way valve 2, the gas-liquid separator 14 having an inlet and an outlet, the inlet of the gas-liquid separator 14 being in communication with the second port of the four-way valve 2, the outlet of the gas-liquid separator 14 being in communication with the suction port of the compressor 1. The gas-liquid separator 14 can perform gas-liquid separation to prevent the compressor 1 from sucking the liquid.

Preferably, the heat exchange structure on the water tank 7 is a heat exchange coil, and the heat exchange coil has a longer flow path, so that the heat exchange effect of the refrigerant at the water tank 7 can be improved.

The application also provides a control method of the air conditioning system, which is used for controlling the operation of the air conditioning system, and comprises the following steps: acquiring an operation mode of the air conditioning system and acquiring the water temperature T1 in the water tank 7; according to the operation mode and the size of T1, the four-way valve 2 is controlled to be switched between a first state and a fourth state, the first three-way valve 10 is controlled to be switched between a second state and a fifth state, the second three-way valve 11 is controlled to be switched between a third state and a sixth state, the first throttling element 5 is controlled to be opened or closed, and the second throttling element 6 is controlled to be opened or closed. When the air conditioning system is operating in different modes and the water temperature in the water tank 7 is in different temperature ranges. The air conditioning system can be controlled to heat the water in the water tank 7 or cool the water in the water tank 7 or absorb heat from the water in the water tank 7 when the air conditioning system is controlled to refrigerate according to specific conditions; when the air conditioning system is controlled to heat, water in the water tank 7 can absorb heat and store energy, or the water in the water tank 7 can emit heat. To achieve these functions, the four-way valve 2, the first three-way valve 10 and the second three-way valve 11 are controlled to be in corresponding states, and the first throttling element 5 and the second throttling element 6 are controlled to be opened or closed under corresponding conditions, so that the refrigerant can be properly circulated in corresponding modes.

When the air conditioning system operates in a heat storage and refrigeration mode, ta-T1 is more than or equal to Tb and T1 is less than or equal to Tc, the four-way valve 2 is controlled to be in a first state, the first three-way valve 10 is controlled to be in a fifth state, the second three-way valve 11 is controlled to be in a sixth state, the first throttling element 5 is controlled to be closed, and the second throttling element 6 is controlled to be opened. Wherein, ta is the preset water temperature of the air conditioning system, ta is 35 to 55 ℃, tb is 3 ℃, tc is 45 to 55 ℃, the heat storage and refrigeration mode is the air conditioning system refrigeration mode, and the water in the water tank 7 is heated at the same time, and the refrigerant flow direction in the mode can refer to the discussion above regarding the air conditioning system refrigeration and the water tank heating. In this mode, when Ta-T1 is greater than or equal to Tb and T1 is less than or equal to Tc, it is indicated that the water temperature in the water tank 7 is low, the first throttling element 5 needs to be closed, the refrigerant of the outdoor heat exchanger 4 is reduced, the compressor 1 directly discharges the refrigerant with high temperature and high pressure to the heat exchange structure of the water tank 7, and the water in the water tank 7 is quickly heated to meet the requirement. At this time, the water tank 7 functions as a condenser.

When Ta-T1 is smaller than Tb or T1 is larger than Tc, the water temperature in the water tank 7 is indicated to be close to the preset water temperature, and the condensation effect is poor along with the rising of the water temperature, so that the first throttling element 5 is required to be started to ensure the refrigeration effect, the outdoor heat exchanger 4 is required to reduce the condensation temperature, and the refrigeration capacity is improved.

Specifically, td is-1 ℃, when Ta-T1 is less than or equal to Td, the water temperature in the water tank 7 is indicated to reach the set water temperature, the second throttling element 6 is controlled to be closed, the water tank 7 does not participate in system condensation, and the water tank 7 does not need to be heated.

In this embodiment, the outdoor temperature T2 is obtained, and when the air conditioning system operates in the cold accumulation+refrigeration mode, T2 is less than Te, and T1 is greater than Tf, the four-way valve 2 is controlled to be in the first state, the first three-way valve 10 is controlled to be in the second state, the second three-way valve 11 is controlled to be in the third state, the first throttling element 5 is controlled to be opened, and the second throttling element 6 is controlled to be opened. Wherein Te is 20-30 ℃, tf is 5 ℃, the cold accumulation and refrigeration mode is that the air conditioning system cools water in the water tank 7, and the flow direction of the refrigerant in the mode can be referred to the discussion above about the cooling of the air conditioning system and the cooling of the water tank. In this mode, when T2 < Te and T1 > Tf, it indicates that the outdoor temperature is reduced at night, but the water in the water tank 7 can be further cooled, the heat exchange structure of the water tank 7 is required to work in parallel with the indoor heat exchanger 3, the air conditioner cools the air conditioner, and the water in the water tank 7 is cooled.

When T1 is less than or equal to Tf, the water temperature in the water tank 7 is indicated to be reduced to the target temperature, the second throttling element 6 is controlled to be closed, the water tank 7 does not participate in heat exchange, and the water tank 7 is not required to be cooled.

In this embodiment, when the air conditioning system operates in the heat absorption+cooling mode and T2 > Tg > T1, the four-way valve 2 is controlled to be in the first state, the first three-way valve 10 is controlled to be in the fifth state, the second three-way valve 11 is controlled to be in the sixth state, the first throttling element 5 is controlled to be opened, and the second throttling element 6 is controlled to be opened. Wherein Tg is 35 to 45 ℃, the heat absorption+refrigeration mode is that the air conditioning system is refrigerating, the low temperature water in the water tank 7 condenses the high temperature and high pressure refrigerant, and the refrigerant flow direction in this mode can refer to the discussion above regarding the refrigerating of the air conditioning system and the condensing of the high temperature and high pressure refrigerant by the water tank 7. In this mode, when T2 > Tg > T1, it indicates that the outdoor temperature is higher during daytime, but the water temperature in the water tank 7 is lower, and when the water tank 7 is used as a condenser, the heat exchange structure of the water tank 7 and the outdoor heat exchanger 4 are required to work in parallel, and part of the high-temperature and high-pressure gas discharged by the compressor 1 enters the heat exchange structure of the water tank 7, at this time, the water temperature of the water tank is lower, the heat exchange temperature difference is larger, the heat exchange effect is good, and the high-temperature refrigerating capacity is facilitated to be improved.

When T1 is more than or equal to Tg, the water temperature in the water tank 7 is too high, the condensing effect is poor, the second throttling element 6 is controlled to be closed, and the water tank 7 does not participate in heat exchange.

In this embodiment, when the air conditioning system operates in the heat absorption and heating mode, T2 is greater than or equal to Th, and T1 is less than Ti, the four-way valve 2 is controlled to be in the fourth state, the first three-way valve 10 is controlled to be in the second state, the second three-way valve 11 is controlled to be in the third state, the first throttling element 5 is controlled to be opened, and the second throttling element 6 is controlled to be opened. Wherein Th is 10-20deg.C, ti is 45-55deg.C, and the heat absorption and heating mode is for heating air conditioning system and heating water in the water tank 7, and the flow direction of refrigerant in this mode can be referred to above for heating air conditioning system and heating water tank 7. In this mode, when T2 is greater than or equal to Th and T1 is less than Ti, it shows that the outdoor temperature is higher in daytime, the heat exchange effect of the outdoor heat exchanger 4 is good, the capacity is sufficient, but the temperature of water in the water tank 7 is lower, the heat exchange structure of the water tank 7 and the outdoor heat exchanger 4 are required to work in parallel, the water tank is heated, and surplus heat is stored.

When T1 is more than or equal to Ti, the water temperature in the water tank 7 reaches the target temperature, the second throttling element 6 is controlled to be closed, the water tank 7 does not participate in heat exchange, and the water tank 7 is not required to be heated.

In this embodiment, when the air conditioning system operates in the heat release and heating mode, T2 is less than or equal to Tj, and T2 is less than T1, the four-way valve 2 is controlled to be in the fourth state, the first three-way valve 10 is controlled to be in the fifth state, the second three-way valve 11 is controlled to be in the sixth state, the first throttling element 5 is controlled to be opened, and the second throttling element 6 is controlled to be opened. Wherein Tj is 2 ℃, the heat release and heating mode is that the air conditioning system heats and absorbs heat from the water in the water tank 7, and the flow direction of the refrigerant in this mode can be referred to the discussion above regarding the heating of the air conditioning system and the heat absorption from the water tank 7. In the mode, when T2 is less than or equal to Tj and T2 is less than T1, the outdoor temperature is lower at night, the heat transfer temperature difference is small, the heating effect is poor, the heat exchange structure of the outdoor heat exchanger 4 and the water tank 7 is required to work in parallel, the heat of the water tank 7 is absorbed, and the low-temperature heating capacity is improved.

When T2 is more than or equal to T1, the water temperature in the water tank 7 is lower than the external temperature, heat cannot be absorbed from the water tank 7, the second throttling element 6 is controlled to be closed, and the water tank 7 does not participate in heat exchange.

It will be readily appreciated by those skilled in the art that the above advantageous ways can be freely combined and superimposed without conflict.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model. The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present utility model, and these modifications and variations should also be regarded as the scope of the utility model.

Claims

1. An air conditioning system is characterized by comprising a compressor (1), a control valve, an indoor heat exchanger (3), an outdoor heat exchanger (4), a first throttling element (5), a second throttling element (6) and a water tank (7), wherein the water tank (7) is provided with a heat exchange structure, the control valve is provided with a first port, a second port, a third port and a fourth port, an exhaust port of the compressor (1) is communicated with the first port, an air suction port of the compressor (1) is communicated with the second port, the indoor heat exchanger (3), the outdoor heat exchanger (4) and the first throttling element (5) are all arranged on a first flow path (8), a first end of the first flow path (8) is communicated with the third port, a second end of the first flow path (8) is communicated with the fourth port, the heat exchange structure and the second throttling element (6) are all arranged on a second flow path (9), two ends of the second flow path (9) are all communicated with the first flow path (8), and the first flow path (9) is located between the first end of the first flow path (4) and the first throttling element (5).

2. The air conditioning system according to claim 1, characterized in that the control valve is a four-way valve (2), the four-way valve (2) having a first state, the first port and a third port being in communication within the four-way valve (2) when the four-way valve (2) is in the first state, the second port and a fourth port being in communication within the four-way valve (2).

3. An air conditioning system according to claim 2, characterized in that the second flow path (9) is further provided with a first three-way valve (10) and a second three-way valve (11), the first three-way valve (10) being located between the heat exchange structure and the first end of the second flow path (9), the first three-way valve (10) having a fifth port, a sixth port and a seventh port, each of which communicates with the second flow path (9), and a third flow path (12), the first end of the third flow path (12) communicating with the seventh port, the second end of the third flow path (12) communicating with the first flow path (8), and the second end of the third flow path (12) being located between the indoor heat exchanger (3) and the second end of the first flow path (8); the second three-way valve (11) is located between the second throttling element (6) and the second end of the second flow path (9), the second three-way valve (11) is provided with an eighth port, a ninth port and a tenth port, the eighth port and the ninth port are communicated with the second flow path (9), the second three-way valve further comprises a fourth flow path (13), the first end of the fourth flow path (13) is communicated with the tenth port, the second end of the fourth flow path (13) is communicated with the first flow path (8), and the second end of the fourth flow path (13) is located between the outdoor heat exchanger (4) and the first throttling element (5).

4. An air conditioning system according to claim 3, characterized in that the sixth port is close to the first end of the second flow path (9) with respect to the fifth port, the first three-way valve (10) having a second state, the fifth port being in communication with a seventh port within the first three-way valve (10) when the first three-way valve (10) is in the second state; the ninth port is adjacent to the second end of the second flow path (9) with respect to the eighth port, the second three-way valve (11) having a third state, the eighth port being in communication with the tenth port within the second three-way valve (11) when the second three-way valve (11) is in the third state.

5. The air conditioning system according to claim 4, characterized in that the first three-way valve (10) also has a fifth state, the fifth and sixth ports being in communication within the first three-way valve (10) when the first three-way valve (10) is in the fifth state; the second three-way valve (11) also has a sixth state, the eighth port and the ninth port being in communication within the second three-way valve (11) when the second three-way valve (11) is in the sixth state.

6. The air conditioning system according to claim 2, characterized in that the four-way valve (2) further has a fourth state, the first and fourth ports being in communication within the four-way valve (2) and the second and third ports being in communication within the four-way valve (2) when the four-way valve (2) is in the fourth state.

7. An air conditioning system according to any of claims 1 to 6, characterized in that a gas-liquid separator (14) is further provided between the suction port of the compressor (1) and the second port, the gas-liquid separator (14) having an inlet communicating with the second port and an outlet communicating with the suction port of the compressor (1).

8. An air conditioning system according to any of claims 1 to 6, wherein the heat exchange structure is a heat exchange coil.