CN201819476U - DC inverter air conditioner with waste heat recovery device - Google Patents

Abstract

The utility model discloses a direct current variable frequency air conditioner with waste heat recovery device, including direct current variable frequency compressor (1), oil and gas separator (2), cross valve (3), condenser (4), external vapour and liquid separator (7) and multiunit indoor expansion valve (9) and indoor set (10) that connect in parallel, direct current variable frequency air conditioner still include heat reclamation device and heat pump water heater, heat reclamation device include first water-refrigerant heat exchanger (13), hot-water tank (14) and water pump (15); the heat pump water heater comprises a fixed-frequency compressor (22), a second water-refrigerant heat exchanger (23), a throttling device (24), an evaporator (25) and a gas-liquid separator II (26). The utility model discloses do not receive operating condition's influence, can both carry out heat recovery (heat pump water heater plays the additional action) with the water heating in the hot-water tank to demand temperature when refrigerating in summer, utilize heat pump water heater to heat recovery unit's hot-water tank heating winter.

Description

DC inverter air conditioner with waste heat recovery device

Technical field:

The utility model relates to the technical field of air conditioners, in particular to a DC frequency conversion air conditioner with a waste heat recovery device.

Background technique:

DC inverter multi-split air conditioner, including DC inverter compressor, oil-gas separator, four-way valve, condenser, liquid receiver, external gas-liquid separator, and multiple sets of parallel indoor expansion valves and indoor units. Using the above-mentioned existing technology, when the conventional DC inverter multi-connected air conditioner is running in summer cooling conditions, the compressor discharges high-temperature and high-pressure refrigerant, and the refrigerant is condensed in the condenser to convert the high-temperature and high-pressure refrigerant into low-temperature and low-pressure refrigerant. , the released heat is directly discharged outdoors without utilization, resulting in waste of this part of waste heat, which is not conducive to energy saving.

Utility model content:

The technical problem to be solved by the utility model is to provide a DC variable frequency air conditioner with a waste heat recovery device which performs heat recovery during cooling in summer and uses a heat pump water heater to heat the hot water tank of the heat recovery device in winter.

The technical solution of the utility model is to provide a DC frequency conversion air conditioner with a waste heat recovery device with the following structure, including a DC frequency conversion compressor, an oil-gas separator, a four-way valve, a condenser, a liquid storage device, and an external gas-liquid separator And multiple sets of parallel indoor expansion valves and indoor units.

The DC inverter air conditioner also includes a heat recovery device and a heat pump water heater; the heat recovery device includes a first water-refrigerant heat exchanger, a hot water tank and a water pump, and the first water-refrigerant heat exchanger The two ends of the condenser are connected in parallel, the water inlet and outlet of the first water-refrigerant heat exchanger are connected with the hot water tank, and the water pump is arranged between the first water-refrigerant heat exchanger and the hot water tank On the connecting pipe between; the connecting pipe of the first water-refrigerant heat exchanger near the four-way valve end is provided with a refrigerant flow regulating valve; the heat pump water heater includes a fixed-frequency compressor, a second water-refrigerating agent heat exchanger, throttling device, evaporator and gas-liquid separator, the exhaust end of the fixed-frequency compressor communicates with the second water-refrigerant heat exchanger, and the second water-refrigerant heat exchange The device is communicated with the evaporator through a throttling device, and the evaporator is connected with the gas return end of the compressor through a gas-liquid separator; one end of the second water-refrigerant heat exchanger is connected with the first water-refrigerant The heat exchangers are connected in series, and the other end communicates with the hot water tank.

After adopting the above structure, compared with the prior art, the utility model has the following advantages: adopting the structure of the utility model, a heat pump water heater is added, and the heat recovery device can make the water in the hot water tank reach the required temperature during the cooling operation in summer , there is no need to turn on the heat pump water heater; when the heat recovery device cannot make the water in the hot water tank reach the required temperature, turn on the heat pump water heater and heat the water in the hot water tank at the same time; when heating in winter, the heat recovery device cannot be used , it is also necessary to turn on the heat pump water heater to heat the hot water tank, so that the water in the hot water tank meets the requirements of use. The utility model is not affected by the operating conditions, and can heat the water in the hot water tank to the required water temperature. It plays a very good supplementary role to the heat recovery device.

As an improvement, the refrigerant flow regulating valve is an electric three-way valve, and the electric three-way valve is respectively connected with the four-way valve, the first water-refrigerant heat exchanger and the condenser; The flow rate of the refrigerant entering the first water-refrigerant heat exchanger is more convenient to use.

As an improvement, both the first water-refrigerant heat exchanger and the second water-refrigerant heat exchanger are casing heat exchangers.

As an improvement, the throttling device is an expansion valve, so that the throttling effect is better.

Description of drawings:

The accompanying drawing is a structural schematic diagram of a DC inverter air conditioner with a waste heat recovery device of the present invention.

As shown in the figure: 1. DC inverter compressor, 2. Oil-gas separator, 3. Four-way valve, 4. Condenser, 5. Liquid receiver, 6. Stop valve I, 7. External gas-liquid separator, 8. Oil return capillary, 9. Indoor expansion valve, 10. Indoor unit, 11. Gas-liquid separator I, 12. Heating expansion valve, 13. First water-refrigerant heat exchanger, 14. Hot water tank, 15 , water pump, 16, electric three-way valve, 17, one-way valve, 18, shower nozzle, 19, stop valve II, 20, unloading solenoid valve, 21, liquid bypass solenoid valve, 22, fixed frequency compressor, 23, The second water-refrigerant heat exchanger, 24, throttling device, 25, evaporator, 26, gas-liquid separator II.

Detailed ways:

Below in conjunction with accompanying drawing and specific embodiment the utility model is further described:

The DC frequency conversion air conditioner with waste heat recovery device of the present utility model is composed of a DC frequency conversion compressor 1 with a gas-liquid separator 111, an oil-gas separator 2, a four-way valve 3, a condenser 4, a liquid storage device 5, a cut-off valve I 6, an external gas-liquid separator 7, an oil return capillary 8, an indoor expansion valve 9, a plurality of indoor units 10 and connecting pipelines; The inlet end is connected, and the oil return end of the oil-gas separator 2 is communicated with the gas-liquid separator 111 carried by the compressor 1 through the oil return capillary 8, and the gas outlet end of the oil-gas separator 2 is connected with the four-way valve 3; The other three ends of four-way valve 3 are respectively connected with external gas-liquid separator 7, condenser 4, indoor unit 10, and described external gas-liquid separator 7 is connected with gas-liquid separator 111, and described condensing The device 4 is connected to the indoor unit 10 through the liquid storage device 5 and the indoor expansion valve 9 in turn, and the liquid storage device 5 is connected to the external gas-liquid separator 7 through a capillary tube; A heating expansion valve 12 is connected between them.

The DC inverter air conditioner also includes a heat recovery device, the heat recovery device includes a first water-refrigerant heat exchanger 13, a hot water tank 14 and a water pump 15, and the first water-refrigerant heat exchanger 13 is connected in parallel at both ends of the condenser 4, the water inlet and outlet of the first water-refrigerant heat exchanger 13 are connected with the hot water tank 14, and the water pump 15 is set on the first water-refrigerant heat exchanger 13 and the hot water tank 14 on the connecting pipe; the first water-refrigerant heat exchanger 13 is provided with a refrigerant flow regulating valve on the connecting pipe near the end of the four-way valve 3 .

The DC inverter air conditioner also includes a heat pump water heater, and the heat pump water heater includes a fixed frequency compressor 22, a second water-refrigerant heat exchanger 23, a throttling device 24, an evaporator 25, and a gas-liquid separator II 26. The exhaust end of the fixed-frequency compressor 22 communicates with the second water-refrigerant heat exchanger 23, and the second water-refrigerant heat exchanger 23 communicates with the evaporator 25 through the throttling device 24. The evaporator 25 is connected to the gas return end of the fixed frequency compressor 22 through the gas-liquid separator II 26; one end of the second water-refrigerant heat exchanger 23 is connected with the first water-refrigerant heat exchanger 13 in series Connect, and the other end communicates with the hot water tank 14.

The refrigerant flow regulating valve is an electric three-way valve 16, and the electric three-way valve 16 communicates with the four-way valve 3, the first water-refrigerant heat exchanger 13 and the condenser 4 respectively.

Both the first water-refrigerant heat exchanger 13 and the second water-refrigerant heat exchanger 23 are casing heat exchangers.

The throttling device 24 is an expansion valve.

The water outlet of described hot water tank 14 is connected with shower nozzle 18, like this, can utilize the hot water in the hot water tank 14 to take a bath.

A one-way valve 17 connected in parallel with the heating expansion valve 12 is provided between the condenser 4 and the liquid receiver 5, so that when the air conditioner is cooling, the heating expansion valve does not need to play a throttling role, and the refrigerant flows from the condenser And through the one-way valve to the liquid storage, the conduction direction of the one-way valve is from the condenser to the liquid storage; when the air conditioner is heating, the heating expansion valve acts as a throttle, and the refrigerant enters the heating expansion valve from the liquid storage (At this time, the direction of the refrigerant is the direction in which the one-way valve cuts off). Adding a one-way valve is more conducive to throttling control.

The working principle of the utility model: when the utility model is operated under cooling conditions in summer, the heat recovery device can make the water in the hot water tank reach the required temperature, and there is no need to turn on the heat pump water heater. The capacity required by the machine 10 is used to adjust the operating frequency. The compressor exhaust and the oil mixture enter the oil-air separator 2 for oil-gas separation. The separated lubricating oil enters the return air end of the DC inverter compressor 1 through the oil return capillary 8, and the residual lubricating oil The flow rate of the refrigerant entering the condenser 4 and the first water-refrigerant heat exchanger 13 is adjusted through the electric three-way valve 16 along with the exhaust gas, and the high-pressure and high-temperature refrigerant entering the first water-refrigerant heat exchanger 13 releases heat and To heat the water in the hot water tank 14, the water pump drives the water in the hot water tank 14 to circulate in the first water-refrigerant heat exchanger 13; the refrigeration after heat exchange in the first water-refrigerant heat exchanger 13 The refrigerant merges with the refrigerant that enters the condenser 4 and is condensed and discharged, passes through the one-way valve 17 and the heating expansion valve (at this time, the expansion valve is fully open and does not have a throttling effect), and then enters the high-pressure liquid receiver 5, and the condensate passes through Distributed into the indoor unit 10 that needs to be operated, the low-temperature and low-pressure refrigerant is generated by the indoor expansion valve 9 and exchanges heat with the indoor air, and then the refrigerant enters the external gas-liquid separator 7 through the four-way valve 3, and then returns to the compression The machine has its own gas-liquid separator I 11 and compressor 1 back to the gas end, so the reciprocating cycle.

During cooling operation in summer, when the heat recovery device cannot make the water in the hot water tank 14 reach the required temperature, the heat pump water heater is turned on to heat the water in the hot water tank 14 at the same time. The working principle of the heat recovery device has been described above. , I won’t go into details here. At this time, the fixed-frequency compressor 22 of the heat pump water heater is turned on, and the high-temperature and high-pressure refrigerant enters the second water-refrigerant heat exchanger 23, and the water in the hot water tank passes through the water pump in the first water-cooling The refrigerant heat exchanger 13 and the second water-refrigerant heat exchanger 23 circulate in circulation. After the refrigerant is heat-exchanged, it is throttled by the throttling device 24, and becomes a low-temperature and low-pressure refrigerant, enters the evaporator 25, and then passes through the gas-liquid separator II Return to the air return end of the fixed frequency compressor.

When heating in winter, the heat recovery device cannot be used, and it is necessary to turn on the heat pump water heater to heat the hot water tank, so that the water in the hot water tank meets the requirements of use. The utility model is not affected by the operating conditions and can The water in the hot water tank is heated to the required water temperature, which is a good supplement to the heat recovery device.

Claims (4)

1. DC frequency converting air-conditioner that has waste-heat recovery device, comprise DC frequency-changeable compressor (1), gs-oil separator (2), cross valve (3), condenser (4), external gas-liquid separator (7) and many groups indoor expansion valve (9) and indoor set (10) in parallel, it is characterized in that: described DC frequency converting air-conditioner also comprises heat reclamation device and Teat pump boiler, described heat reclamation device comprises first water-refrigerant heat exchanger (13), boiler (14) and water pump (15), described first water-refrigerant heat exchanger (13) two ends that are communicated with in condenser (4) in parallel, the water inlet of first water-refrigerant heat exchanger (13) and delivery port are communicated with boiler (14), and described water pump (15) is arranged on the connecting pipe between water-refrigerant heat exchanger (13) and the boiler (14); Described water-refrigerant heat exchanger (13) is provided with the refrigerant flow control valve near the connecting pipe of cross valve (3) end; Described Teat pump boiler comprises invariable frequency compressor (22), second water-refrigerant heat exchanger (23), throttling arrangement (24), evaporimeter (25) and gas-liquid separator II (26), the exhaust end of described invariable frequency compressor (22) is communicated with second water-refrigerant heat exchanger (23), described second water-refrigerant heat exchanger (23) is communicated with evaporimeter (25) through throttling arrangement (24), and described evaporimeter (25) is connected with the air return end of invariable frequency compressor (22) through gas-liquid separator II (26); One end of described second water-refrigerant heat exchanger (23) is connected in series with first water-refrigerant heat exchanger (13), and the other end is communicated with boiler (14).

2. the DC frequency converting air-conditioner that has waste-heat recovery device according to claim 1, it is characterized in that: described refrigerant flow control valve is electric T-shaped valve (16), and described electric T-shaped valve (16) is communicated with cross valve (3), first water-refrigerant heat exchanger (13) and condenser (4) respectively.

3. the DC frequency converting air-conditioner that has waste-heat recovery device according to claim 1 is characterized in that: described first water-refrigerant heat exchanger (13) and second water-refrigerant heat exchanger (23) are double-tube heat exchanger.

4. the DC frequency converting air-conditioner that has waste-heat recovery device according to claim 1 is characterized in that: described throttling arrangement (24) is an expansion valve.

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