A water source heat pump combined cooling and heating unit

Abstract

The present invention relates to a water source heat pump combined cooling and heating unit, including a continuous cooling part in winter and summer, including a continuous cooling compressor in winter and summer, a third water-refrigerant heat exchanger, a first circulating water pump, a second circulating water pump and a cooling tower; a winter heating and summer cooling part, including a winter heating and summer cooling compressor, a four-way valve, a first water-refrigerant heat exchanger, a second water-refrigerant heat exchanger, a first circulating water pump and a second circulating water pump; the continuous cooling part in winter and summer and the winter heating and summer cooling part are connected for heat exchange through a water-water heat exchanger. The present invention utilizes renewable energy sources such as geothermal energy, soil, and natural water bodies as energy sources for multi-split units. The multi-split outdoor unit adopts water cooling, which effectively improves the thermal efficiency in winter and avoids the problem of shutdown due to excessively low temperatures.

Description

Technical Field

[0001] The invention relates to the technical field of heating, and in particular to a water source heat pump combined cooling and heating unit. Background Art

[0002] In the prior art, with the development of economy and the improvement of living standards, people have higher and higher requirements for living environment, and the energy consumption of air conditioning, heating and domestic hot water is rising. At present, multi-split air conditioning systems are more and more widely used in public buildings.

[0003] However, the traditional multi-split outdoor unit adopts air cooling, which has a large attenuation during winter heating. Moreover, many public buildings have year-round cooling requirements for rooms without external windows due to functional needs. At this time, the waste heat of the multi-split outdoor unit for winter cooling is lost in vain. If the waste heat generated by the multi-split during winter cooling can be utilized, it can not only save energy, but also improve the heating capacity of the multi-split.

[0004] Therefore, there is an urgent need for a water source heat pump combined cooling and heating unit to improve the thermal efficiency in winter and save energy. Summary of the invention

[0005] In order to solve the problems of low thermal efficiency and energy waste in the above solution, the present invention provides a water source heat pump combined cooling and heating unit.

[0006] The present invention provides a water source heat pump combined cooling and heating unit, which adopts the following technical solution:

[0007] A water source heat pump combined cooling and heating unit, comprising:

[0008] Winter heating and summer cooling parts, including winter heating and summer cooling compressors, a four-way valve, a first water-refrigerant heat exchanger, a second water-refrigerant heat exchanger, a first circulating water pump and a second circulating water pump;

[0009] The continuous cooling part in winter and summer includes the continuous cooling compressor in winter and summer, the third water-refrigerant heat exchanger, the third circulating water pump and the cooling tower;

[0010] The continuous cooling part in winter and summer and the heating part in winter and the cooling part in summer are connected for heat exchange via a water-to-water heat exchanger.

[0011] Preferably, in the winter heating and summer cooling parts, the winter heating and summer cooling compressors are respectively connected to the first water-refrigerant heat exchanger 3a, the second water-refrigerant heat exchanger 3c and the first indoor unit through a four-way valve.

[0012] Preferably, the A end of the four-way valve is connected to the outlet of the winter heating and summer cooling compressor; the C end of the four-way valve is connected to the suction pipe of the winter heating and summer cooling compressor.

[0013] Preferably, the B end of the four-way valve is divided into two paths, the first path is connected to the first indoor unit through the first solenoid valve 7, and the second path is connected to the first three-way valve 8b; the D end of the four-way valve is divided into two paths, the first path is connected to the second water-refrigerant heat exchanger 3c through the second solenoid valve 6, and the second path is connected to the first three-way valve 8b.

[0014] Preferably, the T end of the second water-refrigerant heat exchanger 3c is connected to one end of the first electronic expansion valve 5a, and the other end of the first electronic expansion valve 5a is divided into two paths, the first path is connected to the Q end of the second three-way valve 8a, and the second path is connected to the first indoor unit 11b.

[0015] Preferably, the P end of the second three-way valve 8a is connected to the I end of the first water-refrigerant heat exchanger 3a; the H end of the first water-refrigerant heat exchanger 3a is connected to the G end of the first three-way valve 8b.

[0016] Preferably, the J end of the first water-refrigerant heat exchanger 3a is connected to the inlet of the first circulating water pump 9a, the K end of the first water-refrigerant heat exchanger 3a is connected to the M end of the domestic hot water tank, and the V end of the second water-refrigerant heat exchanger 3c is connected to the inlet of the second circulating water pump 9b.

[0017] Preferably, in the continuous cooling part in winter and summer, the two ends of the cooling tower are respectively connected to the third water-refrigerant heat exchanger 3b and the water-water heat exchanger 12.

[0018] Preferably, the E′ end of the third water-refrigerant heat exchanger 3b is connected to the outlet of the third circulating water pump 9c, and the inlet of the third circulating water pump 9c is connected to the Z end of the water-water heat exchanger 12.

[0019] Preferably, the G' end of the third water-refrigerant heat exchanger 3b is connected to the outlet of the winter-summer continuous cooling compressor 1a, and the F' end of the third water-refrigerant heat exchanger 3b is connected to one end of the second electronic expansion valve 5b.

[0020] In summary, the present invention has the following beneficial technical effects:

[0021] 1. The novel water source heat pump combined cooling and heating unit of the present invention utilizes renewable energy sources such as geothermal, soil, and natural water as the energy source of the multi-split unit. The multi-split unit outdoor unit adopts water cooling, which effectively improves the thermal efficiency in winter and avoids the problem of shutdown caused by low temperature.

[0022] 2. A novel water source heat pump combined cooling and heating unit of the present invention utilizes the cooling demand of some rooms in winter, effectively collects the waste heat generated by cooling and uses it as a heating source, thereby saving energy and the length of the underground heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a water source heat pump combined cooling and heating unit according to an embodiment of the present invention.

[0024] Among them, 1a, winter and summer continuous cooling compressor; 1b, winter heating and summer cooling compressor; 2, four-way valve; 3a, first water-refrigerant heat exchanger; 3b, third water-refrigerant heat exchanger; 3c, second water-refrigerant heat exchanger; 4, buried heat exchange pipe; 5a, first electronic expansion valve; 5c, second electronic expansion valve; 6, second solenoid valve; 7, first solenoid valve; 8a, second three-way valve; 8b, first three-way valve; 9a, first circulating water pump; 9b, second circulating water pump; 10, cooling tower; 11a, second indoor unit; 11b, first indoor unit; 12 water-water heat exchanger; 13, third electronic valve; 14, fourth electronic valve. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0026] Example 1

[0027] Reference Figure 1 A water source heat pump combined cooling and heating unit of this embodiment includes:

[0028] Winter heating and summer cooling parts, including winter heating and summer cooling compressors, a four-way valve, a first water-refrigerant heat exchanger, a second water-refrigerant heat exchanger, a first circulating water pump and a second circulating water pump;

[0029] The continuous cooling part in winter and summer includes the continuous cooling compressor in winter and summer, the third water-refrigerant heat exchanger, the third circulating water pump and the cooling tower;

[0030] The continuous cooling part in winter and summer and the heating part in winter and the cooling part in summer are connected for heat exchange through a water-to-water heat exchanger.

[0031] Specific:

[0032] In the winter heating and summer cooling parts of this embodiment, the winter heating and summer cooling compressors are respectively connected to the first water-refrigerant heat exchanger 3a, the second water-refrigerant heat exchanger 3c and the first indoor unit through a four-way valve.

[0033] The A end of the four-way valve is connected to the outlet of the winter heating and summer cooling compressor; the C end of the four-way valve is connected to the suction pipe of the winter heating and summer cooling compressor. The B end of the four-way valve is divided into two paths, the first path is connected to the first indoor unit through the first solenoid valve 7, and the second path is connected to the first three-way valve 8b; the D end of the four-way valve is divided into two paths, the first path is connected to the second water-refrigerant heat exchanger 3c through the second solenoid valve 6, and the second path is connected to the first three-way valve 8b; the other end of the second solenoid valve 6 is also divided into two paths, the first path is connected to the S end of the second water-refrigerant heat exchanger 3c, and the second path is connected to the R end of the second three-way valve 8a.

[0034] The T end of the second water-refrigerant heat exchanger 3c is connected to one end of the first electronic expansion valve 5a, and the other end of the first electronic expansion valve 5a is divided into two paths, the first path is connected to the Q end of the second three-way valve 8a, and the second path is connected to the first indoor unit (11b). The P end of the second three-way valve 8a is connected to the I end of the first water-refrigerant heat exchanger 3a; the H end of the first water-refrigerant heat exchanger 3a is connected to the G end of the first three-way valve 8b. The J end of the first water-refrigerant heat exchanger 3a is connected to the inlet of the first circulating water pump 9a, the K end of the first water-refrigerant heat exchanger 3a is connected to the M end of the domestic hot water tank, and the V end of the second water-refrigerant heat exchanger 3c is connected to the inlet of the second circulating water pump 9b.

[0035] The L end of the domestic hot water tank is connected to the inlet of the first circulating water pump 9a, and the O end and the N end of the domestic hot water tank are the domestic hot water inlet and outlet. The U end of the second water-refrigerant heat exchanger 3c is connected to the outlet of the buried heat exchange pipe 4, and the V end of the second water-refrigerant heat exchanger 3c is connected to the inlet of the second circulating water pump 9b. The outlet of the second circulating water pump 9b is connected to the X end of the water-water heat exchanger 12, and the Y end of the water-water heat exchanger 12 is connected to the inlet of the buried heat exchange pipe 4.

[0036] In the continuous cooling part in winter and summer, the cooling tower 10 has two ends C` and B`. The C` end of the cooling tower is connected to the D` end of the third water-refrigerant heat exchanger 3b, and the B` end of the cooling tower is connected to the A` end of the water-water heat exchanger 12.

[0037] The E' end of the third water-refrigerant heat exchanger 3b is connected to the outlet of the third circulating water pump 9c, and the inlet of the third circulating water pump 9c is connected to the Z end of the water-water heat exchanger 12. The G' end of the third water-refrigerant heat exchanger 3b is connected to the outlet of the continuous cooling compressor 1a in winter and summer, and the F' end of the third water-refrigerant heat exchanger 3b is connected to one end of the second electronic expansion valve 5b. The other end of the second electronic expansion valve 5b is connected to the inlet of the second indoor unit 11a, and the outlet of the second indoor unit 11a is connected to the inlet of the continuous cooling compressor 1a in winter and summer.

[0038] Working principle:

[0039] 1. In the winter heating and summer cooling section:

[0040] In summer, the winter heating and summer cooling compressor 1b is running, and the A end of the four-way valve 2 is connected to the D end, and the B end is connected to the C end. The first solenoid valve 6 is closed. The E end of the electric first three-way valve 8b is connected to the G end, and the F end is disconnected from the G end. The R end of the electric second three-way valve 8a is connected to the Q end, and the R end is disconnected from the P end. The first electronic expansion valve 5a is fully opened, and the indoor unit is running. The first solenoid valve 7 is opened, and the first circulating water pump 9a is running. The winter heating and summer cooling compressor 1b works on the refrigerant, and the refrigerant changes from liquid to high-temperature and high-pressure gas, passes through the exhaust port of the winter heating and summer cooling compressor 1b, enters the A end of the four-way valve 2, flows out of the D end of the four-way valve 2, enters the E end of the second three-way valve 8b, flows out of the G end of the second three-way valve 8b, and enters the first water-refrigerant heat exchanger 3a through the H end of the first water-refrigerant heat exchanger 3a. In the first water-refrigerant heat exchanger 3a, the temperature of the refrigerant gas is higher than the temperature of the domestic hot water. After the temperature of the domestic hot water rises, it flows out through the J end of the first water-refrigerant heat exchanger 3a, and the high-temperature and high-pressure gaseous refrigerant flows out from the I end of the first water-refrigerant heat exchanger 3a, flows into the P end of the second three-way valve 8a, and then flows out through the R end of the second three-way valve 8a, and enters the S end of the second water-refrigerant heat exchanger 3c. In the second water-refrigerant heat exchanger 3c, the refrigerant releases heat to the low-temperature water and then flows out from the T end and enters one end of the first electronic expansion valve 5a, and then flows out from the other end of the first electronic expansion valve 5a and enters one end of the first indoor unit 11b. After exchanging heat with the indoor air in the first indoor unit 11b, it flows out from the other end of the first indoor unit 11b and enters one end of the first solenoid valve 7. Then, it flows out from the other end of the first solenoid valve 7, and the refrigerant flows into the C end of the four-way valve 2. After flowing out from the B end of the four-way valve 2, it enters the inlet of the winter heating and summer cooling compressor 1b and enters the winter heating and summer cooling compressor 1b, thereby forming a refrigerant cycle.

[0041] 2. In the winter heating and summer cooling part:

[0042] In winter, the winter heating and summer cooling compressor 1b is running, and the A end of the four-way valve 2 is connected to the B end, and the D end is connected to the C end. The first solenoid valve 6 is opened. The F end of the electric first three-way valve 8b is connected to the G end, and the F end is disconnected from the E end. The P end of the electric second three-way valve 8a is connected to the Q end, and the R end is disconnected from the P end. The third electronic expansion valve 5c is fully opened, and the indoor unit is running. The first solenoid valve 7 is opened, and the first circulating water pump 9a is running. The winter heating and summer cooling compressor 1b works on the refrigerant, and the refrigerant changes from liquid to high-temperature and high-pressure gas, passes through the exhaust port of the winter heating and summer cooling compressor 1b, enters the A end of the four-way valve 2, and flows out of the B end of the four-way valve 2. The refrigerant is divided into two paths, one path enters the F end of the first three-way valve 8b, flows out of the G end of the first three-way valve 8b, and enters the first water-refrigerant heat exchanger 3a through the H end of the first water-refrigerant heat exchanger 3a. In the first water-refrigerant heat exchanger 3a, the temperature of the refrigerant gas is higher than the temperature of the domestic hot water. After the temperature of the domestic hot water rises, it flows out through the J end of the first water-refrigerant heat exchanger 3a, and the high-temperature and high-pressure gaseous refrigerant flows out from the I end of the first water-refrigerant heat exchanger 3a, flows in from the P end of the second three-way valve 8a, and then flows out through the R end of the second three-way valve 8a. At the same time, the refrigerant flowing into the indoor unit enters the S end of the second water-refrigerant heat exchanger 3c after dissipating heat to the indoor air, and then flows out from the T end. Then the refrigerant merges with the refrigerant flowing out of the Q end, enters the third electronic expansion valve 5c, flows out from the other end after throttling expansion, enters one end of the second electronic valve 6, flows out from the second electronic valve 6, enters the D end of the four-way valve 2, and then flows out from the C end into the inlet of the compressor, completing the refrigerant cycle. When the refrigerant completes the cycle, the second circulating water pump 9b starts to run, and the water circulates into the U end of the second water-refrigerant heat exchanger 3c, releases heat to the refrigerant in the heat exchanger, then flows out from the V end and enters one end of the second circulating water pump 9b, flows out from the other end and enters the X end of the water-water heat exchanger, absorbs heat from the circulating water on the other side and flows out from the Y end, enters one end of the underground heat exchange tube, absorbs heat in the underground heat exchange tube and flows out from the other end, and then enters the U end of the second water-refrigerant heat exchanger 3c to complete the cycle.

[0043] 3. In the continuous cooling part in winter and summer,

[0044] In summer, the winter-summer continuous cooling compressor 1a runs, the second electronic expansion valve 5b is fully opened, the indoor unit runs, the H' end of the third three-way valve 8c is connected to the I' end, the third electronic valve 13 is closed, the third electronic valve 13 is opened, and the third circulating water pump 9c runs. The winter-summer continuous cooling compressor 1a works on the refrigerant, and the refrigerant changes from liquid to high-temperature and high-pressure gas, passes through the exhaust port of the winter heating and summer cooling compressor 1b, enters the H' end of the third three-way valve 8c, and then flows out from the J' end. The refrigerant enters the G' end of the third water-refrigerant heat exchanger 3b, releases heat to the circulating water in the third water-refrigerant heat exchanger 3b, flows out from the F' end, enters one end of the electronic expansion valve 5b, undergoes throttling expansion, flows out from the other end and enters one end of the indoor unit, and after the indoor unit absorbs heat from the indoor air in the indoor unit, flows out from the other end to the inlet of the winter-summer continuous cooling compressor 1a to complete the cycle. The circulating water flows out from the outlet of the third circulating water pump 9c and enters the E' end of the first water-refrigerant heat exchanger 3a, absorbs heat from the refrigerant, flows out from the D' end and enters the C' end of the cooling tower 10, and dissipates heat to the air and flows out from the B' end and enters the inlet of the third circulating water pump 9c to complete the cycle.

[0045] 4. In the continuous cooling part in winter and summer,

[0046] In winter, the winter-summer continuous cooling compressor 1a is running, the second electronic expansion valve 5b is fully open, the indoor unit is running, the H' end of the third three-way valve 8c is connected to the J' end, the third electronic valve 13 is opened, the fourth electronic valve 14 is closed, and the third circulating water pump 9c is running. The winter-summer continuous cooling compressor 1a works on the refrigerant, and the refrigerant changes from liquid to high-temperature and high-pressure gas, passes through the exhaust port of the winter heating and summer cooling compressor 1b, enters the H' end of the third three-way valve 8c, and then flows out from the J' end. The refrigerant enters one end of the indoor unit, releases heat to the indoor air in the indoor unit, flows out from the other end of the indoor unit, enters one end of the electronic expansion valve 5b, undergoes throttling expansion, flows out from the other end, enters the F' end of the third water-refrigerant heat exchanger 3b, absorbs heat from the circulating water in the third water-refrigerant heat exchanger 3b, flows out from the G' end and enters one end of the solenoid valve 13, flows out from the other end and enters the inlet of the winter-summer continuous cooling compressor 1a to complete the cycle. The circulating water flows out from the outlet of the third circulating water pump 9c and enters the E' end of the first water-refrigerant heat exchanger 3a, absorbs heat from the refrigerant, flows out from the D' end and enters the A' end of the third water-refrigerant heat exchanger 3b, and releases heat to the circulating water on the other side and flows out from the Z end and enters the inlet of the third circulating water pump 9c to complete the cycle.

[0047] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A water source heat pump combined cooling and heating unit, characterized in that: include: Winter heating and summer cooling parts, including winter heating and summer cooling compressors, a four-way valve, a first water-refrigerant heat exchanger, a second water-refrigerant heat exchanger, a first circulating water pump and a second circulating water pump; The continuous cooling part in winter and summer includes the continuous cooling compressor in winter and summer, the third water-refrigerant heat exchanger, the third circulating water pump and the cooling tower; The continuous cooling part in winter and summer and the heating part in winter and the cooling part in summer are connected for heat exchange via a water-to-water heat exchanger; In the winter heating and summer cooling parts, the winter heating and summer cooling compressors are respectively connected to the first water-refrigerant heat exchanger, the second water-refrigerant heat exchanger and the first indoor unit through a four-way valve; The A end of the four-way valve is connected to the outlet of the winter heating and summer cooling compressors; the C end of the four-way valve is connected to the suction pipes of the winter heating and summer cooling compressors; The B end of the four-way valve is divided into two paths, the first path is connected to the first indoor unit through the first solenoid valve, and the second path is connected to the first three-way valve; the D end of the four-way valve is divided into two paths, the first path is connected to the second water-refrigerant heat exchanger through the second solenoid valve, and the second path is connected to the first three-way valve; In the continuous cooling part in winter and summer, two ends of the cooling tower are respectively connected to the third water-refrigerant heat exchanger and the water-water heat exchanger.

2. A water source heat pump combined cooling and heating unit according to claim 1, characterized in that: The T end of the second water-refrigerant heat exchanger is connected to one end of the first electronic expansion valve, and the other end of the first electronic expansion valve is divided into two paths, the first path is connected to the Q end of the second three-way valve, and the second path is connected to the first indoor unit.

3. A water source heat pump combined cooling and heating unit according to claim 2, characterized in that: The P end of the second three-way valve is connected to the I end of the first water-refrigerant heat exchanger; the H end of the first water-refrigerant heat exchanger is connected to the G end of the first three-way valve.

4. A water source heat pump combined cooling and heating unit according to claim 3, characterized in that: The J end of the first water-refrigerant heat exchanger is connected to the inlet of the first circulating water pump, the K end of the first water-refrigerant heat exchanger is connected to the M end of the domestic hot water tank, and the V end of the second water-refrigerant heat exchanger is connected to the inlet of the second circulating water pump.

5. A water source heat pump combined cooling and heating unit according to claim 4, characterized in that: The E' end of the third water-refrigerant heat exchanger is connected to the outlet of the third circulating water pump, and the inlet of the third circulating water pump is connected to the Z end of the water-water heat exchanger.

6. A water source heat pump combined cooling and heating unit according to claim 5, characterized in that: The G' end of the third water-refrigerant heat exchanger is connected to the outlet of the compressor for continuous cooling in winter and summer, and the F' end of the third water-refrigerant heat exchanger is connected to one end of the second electronic expansion valve.

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