CN101571330B - A frost-free multifunctional solar-assisted heat pump system - Google Patents

Abstract

The invention discloses a frost-free multifunctional solar auxiliary heat pump system. The invention includes four parts: a refrigerant circuit, a first refrigerant circuit, a second refrigerant circuit and a domestic hot water branch. The refrigerant circulation system has a compressor, a refrigerant shut-off valve, a four-way valve, a first one-way shut-off valve, a second one-way shut-off valve, a first throttling element, a second throttling element, and a high-pressure liquid storage tank connected in sequence , Vapor-liquid separator. The first brine circuit has a first brine tank, a first brine pump, and an indoor heat exchanger connected in sequence. The second brine circuit includes the second brine tank, the second brine pump, the cooling tower and the solar collector, the first brine shut-off valve, the second brine shut-off valve, the third brine Stop valve, the fourth brine stop valve. The invention thoroughly solves the winter frosting problem of the traditional hot and cold water heat pumps and air-cooled heat pumps. It is especially suitable for occasions where solar energy resources are abundant and a large amount of heating and cooling air conditioners and hot water supply are required at the same time.

Description

A frost-free multifunctional solar-assisted heat pump system

technical field

The invention belongs to the fields of heat pump air conditioners, heat pump water heaters and solar energy utilization, and in particular relates to a frost-free multifunctional solar auxiliary heat pump system.

Background technique

At present, fossil fuels account for a huge proportion of the energy used by human beings. As a non-renewable energy source, fossil fuels are facing the plight of depletion, and the environmental problems caused by burning fossil energy have seriously threatened the environment on which human beings live. As a renewable clean energy, solar energy is considered to be the energy source with the most development potential in the 21st century, but its low energy density and instability are the biggest problems when using solar energy at present. Solar-assisted heat pump is a good solar energy utilization technology . With the improvement of people's living standards, indoor heating, indoor cooling and hot water heating have become more and more necessary living conditions for a modern comfortable life, but the realization of these living conditions currently requires the consumption of a large amount of precious fossil fuels. Therefore, using solar-assisted heat pumps to reduce fossil fuel consumption is of increasing social significance.

Most of the existing multifunctional solar-assisted heat pumps are of the indirect expansion type (referred to as indirect expansion type). Whether it is a small air-cooled system or a medium-to-large water-cooled system, there is a problem of frost in winter, which affects the performance of the system. Especially for medium and large systems, the structure is usually more complicated. In recent years, the rapid development of solar water heater technology has provided a broad development space for the expansion solar heat pump. The heat exchange temperature difference between the refrigerant and the air and the regeneration of the refrigerant by using solar energy, using a very simple refrigerant system, completely solve the winter frosting problem of the traditional hot and cold water heat pump and air-cooled heat pump. It is especially suitable for occasions where solar energy resources are abundant and a large amount of heating and cooling air conditioners and hot water supply are required at the same time.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art and provide a frost-free multifunctional solar auxiliary heat pump system.

The frost-free multifunctional solar auxiliary heat pump system includes four parts: a refrigerant circuit, a first refrigerant circuit, a second refrigerant circuit and a domestic hot water branch circuit. The refrigerant circuit is as follows: the high-pressure outlet of the compressor is respectively connected with the first interface of the refrigerant shut-off valve and the first interface of the heat exchanger of the water tank. The second port of the refrigerant cut-off valve is respectively connected with the second port of the water tank heat exchanger and the first port of the four-way valve. The fourth interface of the four-way valve is connected to the first interface of the heat exchanger of the first brine tank, and the second interface of the heat exchanger of the first brine tank is respectively connected to the first interface and the second interface of the first one-way stop valve. The second interfaces of the two throttling elements are connected. The second port of the first one-way stop valve is respectively connected with the first port of the high-pressure liquid storage tank and the second port of the second one-way stop valve, and the second port of the high-pressure liquid storage tank is respectively connected with the first port of the second throttling element. An interface is connected with the first interface of the first throttling element. The second port of the first throttling element is respectively connected with the first port of the second one-way stop valve and the first port of the heat exchanger of the second brine tank. The second interface of the heat exchanger of the second brine tank is connected to the third interface of the four-way valve, and the second interface of the four-way valve is connected to the low-pressure inlet of the compressor through the gas-liquid separator. The first brine circuit: the fourth interface of the first brine tank is connected to the first interface of the indoor heat exchanger, the second interface of the indoor heat exchanger is connected to the first interface of the first brine pump, and the second The second interface of a brine pump is connected with the third interface of the first brine tank. The second brine circuit: the fourth port of the second brine tank is connected to the first port of the second brine pump, and the second port of the second brine pump is respectively connected to the second brine shut-off valve. The first interface is connected to the first interface of the solar collector, the second interface of the second brine shut-off valve is connected to the first interface of the cooling tower, and the second interface of the cooling tower is connected to the first interface of the first brine shut-off valve. An interface is connected. The second interface of the solar collector is respectively connected with the second interface of the third brine shut-off valve and the second interface of the fourth brine shut-off valve, and the first interface of the third brine shut-off valve is connected with the second brine shut-off valve respectively. The second port of the brine stop valve is connected to the third port of the second brine tank. The first port of the fourth brine shut-off valve is connected to the first port of the brine-water heat exchanger, and the second port of the brine-water heat exchanger is connected to the fifth port of the second brine tank . Domestic hot water branch: the cold water inlet is connected to the third interface of the refrigerant-water heat exchanger, the fourth interface of the refrigerant-water heat exchanger is connected to the third interface of the water tank, and the fourth interface of the water tank is connected to the indoor The water outlet is connected.

The first throttling element or the third throttling element is a manual throttling valve, an automatic throttling valve or a capillary tube. The first one-way stop valve or the second one-way stop valve is a manual stop valve or an automatic stop valve. The first one-way stop valve or the second one-way stop valve can be replaced by a two-way stop valve. The refrigerant stop valve, the first brine stop valve, the second brine stop valve, the third brine stop valve, the fourth brine stop valve, and the fifth brine stop valve are two-way stop valves.

The brine-water heat exchanger is a casing heat exchanger or a plate heat exchanger. The water tank, the first brine tank and the second brine tank are airtight pressure-bearing insulation containers with heat exchangers inside, and the heat exchangers in the water tank, the first brine tank and the second brine tank are light Tube immersion heat exchanger or sleeved tube immersion heat exchanger. The indoor heat exchanger is an air-cooled heat exchanger connected with the first brine tank through the first brine pump. The solar heat collecting device and the cooling tower are connected in parallel with the second brine tank through the second brine pump.

The present invention has the beneficial effect compared with prior art:

1) Energy saving. The invention can effectively utilize solar energy as refrigerant evaporation energy, greatly improve the efficiency of the system in winter operation, and make up for the shortcoming of low efficiency of ordinary air conditioners and ordinary heat pump water heaters in winter operation. The general indoor refrigeration efficiency of the present invention is equivalent to that of a common water chiller, and is much higher than that of a common air-cooled unit. The general heating efficiency of the present invention is equivalent to that of a common water source heat pump, much higher than that of an air-cooled heat pump, but the solar assisted heating efficiency of the present invention is greater than that of a common water source heat pump. The hot water heating efficiency of the ordinary heat pump of the present invention is equivalent to that of the ordinary heat pump water heater, but the efficiency of the solar auxiliary heat pump and solar water heating of the present invention is greater than that of the ordinary heat pump water heater.

2) Practicality. The invention combines the cold and hot water heat pump unit and the solar water heater in a very simple way, and can realize multiple functions with only a small amount of electric valves, reduces the difficulty of control, and improves the reliability of operation.

3) Economy. The invention solves the problem of the cold water unit being idle in winter, improves the utilization rate of the equipment, has obvious economic advantages, and is very favorable for popularization.

4) Security. When the present invention is used to prepare hot water, there will be no leakage phenomenon of the electric water heater, and there will be no gas poisoning danger of the gas water heater.

5) Stability. In cold winter conditions, the invention can effectively utilize solar energy and reduce various failures of ordinary air conditioners caused by too low evaporation temperature. In particular, the present invention adopts a very simple refrigerant system, which completely solves the winter frosting problem of traditional hot and cold water heat pumps and air-cooled heat pumps, and improves the reliability of system operation.

Description of drawings

Accompanying drawing is the system flowchart of device of the present invention;

In the figure: compressor 1, refrigerant stop valve 2, four-way valve 3, first brine tank 4, first one-way stop valve 5, second one-way stop valve 6, first throttling element 7, second Second throttling element 8, high-pressure liquid storage tank 9, second brine tank 10, water tank 11, indoor heat exchanger 12, first brine pump 13, brine-water heat exchanger 14, vapor-liquid separation Device 15, first brine shut-off valve 16, second brine shut-off valve 17, third brine shut-off valve 18, fourth brine shut-off valve 19, second brine pump 20, cooling tower 21 , Solar heat collector 22.

Detailed ways

As shown in the attached figure, the frost-free multifunctional solar-assisted heat pump system includes four parts: the refrigerant circuit, the first brine circuit, the second brine circuit and the domestic hot water branch.

The refrigerant circuit is as follows: the high-pressure outlet 1b of the compressor 1 is connected to the first port 2a of the refrigerant shut-off valve 2 and the first port 11a of the heat exchanger of the water tank 11, and the second port 2b of the refrigerant shut-off valve 2 is connected to the water tank 11 respectively. The second port 11b of the heat exchanger is connected to the first port 3a of the four-way valve 3, the fourth port 3d of the four-way valve 3 is connected to the first port 4a of the heat exchanger of the first brine tank 4, and the first port The second port 4b of the heat exchanger of the refrigerant tank 4 is connected to the first port 5a of the first one-way stop valve 5 and the second port 8b of the second throttling element 8 respectively, and the second port of the first one-way stop valve 5 The interface 5b is respectively connected with the first interface 9a of the high-pressure liquid storage tank 9 and the second interface 6b of the second one-way stop valve 6, and the second interface 9b of the high-pressure liquid storage tank 9 is respectively connected with the first port 9b of the second throttling element 8. The interface 8a is connected to the first interface 7a of the first throttling element 7 . The second port 7b of the first throttling element 7 is respectively connected with the first port 6a of the second one-way stop valve 6 and the first port 10a of the heat exchanger of the second brine tank 10 . The second interface 10b of the heat exchanger of the second brine tank 10 is connected to the third interface 3c of the four-way valve 3, and the second interface 3b of the four-way valve 3 is connected to the low-pressure inlet 1a of the compressor 1 through the gas-liquid separator 15 .

The first brine circuit: the fourth interface 4d of the first brine tank 4 is connected to the first interface 12a of the indoor heat exchanger 12, and the second interface 12b of the indoor heat exchanger 12 is connected to the first brine pump 13 The first port 13a of the first brine pump 13 is connected to the second port 13b of the first brine pump 13 and the third port 4c of the first brine tank 4 is connected.

Second brine circuit: the fourth interface 10d of the second brine tank 10 is connected to the first interface 20a of the second brine pump 20, and the second interface 20b of the second brine pump 20 is connected to the second brine pump 20 respectively. The first port 17a of the brine stop valve 17 is connected to the first port 22a of the solar collector 22, and the second port 17b of the second brine stop valve 17 is connected to the first port 21a of the cooling tower 21, and the cooling tower The second port 21b of 21 is connected with the first port 16a of the first brine stop valve 16 . The second interface 22b of the solar heat collector 22 is connected with the second interface 18b of the third brine shut-off valve 18 and the second interface 19b of the fourth brine shut-off valve 19 respectively, and the second interface 19b of the third brine shut-off valve 18 The first port 18a is respectively connected to the second port 16b of the second brine stop valve 16 and the third port 10c of the second brine tank 10 . The first port 19a of the fourth brine shut-off valve 19 is connected to the first port 14a of the brine-water heat exchanger 14, and the second port 14b of the brine-water heat exchanger 14 is connected to the second brine The fifth interface 10e of the box 10 is connected.

Domestic hot water branch: the cold water inlet is connected to the third interface 14c of the brine-water heat exchanger 14, the fourth interface 14d of the brine-water heat exchanger 14 is connected to the third interface 11c of the water tank 11, and the water tank The fourth interface 11d of 11 is connected with the indoor water outlet.

The first throttling element 7 or the third throttling element 8 is a manual throttling valve, an automatic throttling valve or a capillary tube. The first one-way stop valve 5 or the second one-way stop valve 6 is a manual stop valve or an automatic stop valve. The first one-way stop valve 5 or the second one-way stop valve 6 can be replaced by a two-way stop valve. Refrigerant stop valve 2, first brine stop valve 15, second brine stop valve 16, third brine stop valve 17, fourth brine stop valve 18, fifth brine stop valve 19 It is a two-way stop valve.

The brine-water heat exchanger 14 is a casing heat exchanger or a plate heat exchanger. The water tank 11, the first brine tank 4 and the second brine tank 10 are airtight pressure-bearing insulation containers with a heat exchanger inside, and the water tank 11, the first brine tank 4 and the second brine tank 10 The inner heat exchanger is a bare tube immersion heat exchanger or a sleeved tube immersion heat exchanger. The indoor heat exchanger 12 is an air-cooled heat exchanger, and is connected to the first brine tank 4 through a first brine pump 13 . The solar thermal collector 22 and the cooling tower 21 are connected in parallel with the second brine tank 10 through the second brine pump 20 .

The present invention adopts a split structure, the indoor heat exchanger 12 needs to be installed indoors, the brine-water heat exchanger 14, the cooling tower 21 and the compressor can be installed outside the first brine pump 13, the second brine pump A place not far from the agent pump 20, the water tank 11, the first brine tank 4 and the second brine tank 10, the cooling tower 21, the water tank 11, the first brine tank 4, the second brine tank 10, The first brine pump 13, the second brine pump 20, the brine-water heat exchanger and the compressor can also be installed on the roof as an integral part, and the heat collector 22 is installed in the place where the outdoor solar radiation is the strongest and the most For long periods of time such as roofs. The indoor unit and the outdoor unit are connected by a brine pipeline. The water inlet pipe of the water tank 11 is connected with the building water supply system, and the domestic hot water in the water tank 11 is released for use through the water outlet.

The main functional modes that can be realized by the present invention are: ordinary indoor heating, solar-assisted indoor heating, ordinary indoor cooling, indoor cooling and heat pump hot water, indoor cooling and solar-assisted heat pump hot water, ordinary heat pump hot water, solar energy Auxiliary heat pump water heating, ordinary solar water heating and refrigerant regeneration. The following is the detailed workflow of these nine functional modes:

1) Ordinary indoor heating

In rainy weather or at night in winter, there is no need for domestic hot water or the water temperature of the domestic hot water tank has reached the set temperature, but the room still needs to be heated.

Refrigerant circuit: High-temperature and high-pressure refrigerant comes out of the compressor port 1b, passes through the refrigerant stop valve 2, enters the four-way valve 3 (the water tank 11 is short-circuited), and then flows out from the four-way valve port 3d into the first brine tank 4 for condensation heat exchange. The refrigerant flows out from the interface 4b and enters the first one-way stop valve 5, and then flows to the high-pressure liquid storage tank 9, and the high-pressure liquid refrigerant coming out of the interface 9b at the bottom of the high-pressure liquid storage tank 9 enters the first throttling element 7 to throttle, Then it enters the second brine tank 10 for boiling heat exchange, and the low-pressure gaseous refrigerant flows out from the interface 10a, and returns to the compressor 1 after passing through the four-way valve 3 and the gas-liquid separator 15 .

The first brine circuit: the brine is heated by the refrigerant in the first brine tank 4 and flows out from the interface 4d, enters the indoor heat exchanger 12 and supplies heat to the room, and the cooled brine flows through the second brine A brine pump 13 is then sent back to the first brine tank 4 .

The second brine circuit: the brine in the second brine tank 10 flows out from the port 10d after being cooled by the refrigerant, and enters the cooling tower after passing through the second brine pump 20 and the second brine shut-off valve 17 21 and air heat exchange (at this moment, the third brine shut-off valve 18 and the fourth brine shut-off valve 19 are closed), and the brine returns to the second brine tank 10 after passing through the first brine shut-off valve 16 .

The domestic hot water circuit is not working.

2) Solar energy assisted indoor heating

During the day when the weather is fine in winter, and there is no need for domestic hot water or the water temperature of the domestic hot water tank has reached the set temperature, but the room still needs to be heated.

The refrigerant circuit and the first refrigerant circuit are the same as scheme 1.

The second brine circuit: the brine flows out from the interface 10d after being cooled by the refrigerant in the second brine tank 10, and is pumped through the second brine pump 20 (at this time, the second brine shut-off valve 17 is closed ) into the solar heat collector 22. The brine is heated here, then flows out from the interface 22b, and returns to the second brine tank 10 through the third brine shut-off valve 18 (at this moment, the first brine shut-off valve 16 and the fourth brine shut-off valve valve 19 closed).

The domestic hot water circuit is not working.

3) Ordinary indoor refrigeration

During the high temperature period in summer, only indoor cooling is required, and it is activated when domestic hot water is not required.

Refrigerant circuit: The high-temperature and high-pressure refrigerant coming out of the compressor outlet 1b flows through the refrigerant stop valve 2 and then flows to the four-way valve 3 (the water tank 11 is short-circuited), and then flows from the interface 3c of the four-way valve 3 to the second brine box of 10. The refrigerant in the heat exchanger condenses and releases heat, then flows through the second one-way stop valve 6 and enters the high-pressure liquid storage tank 9 . The liquid refrigerant flows from the interface 9b at the bottom of the high-pressure liquid storage tank 9 to the second throttling element 8, and the throttled low-temperature and low-pressure refrigerant flows into the first brine tank 4 to boil and exchange heat, absorb the heat of the brine, and vaporize The final refrigerant flows back to the compressor 1 through the four-way valve 3 and the vapor-liquid separator 15 .

The first brine circuit: the brine flows out from the outlet 13b of the first brine pump 13, enters the first brine tank 4 and is cooled by the refrigerant, then flows to the indoor heat exchanger to supply cooling to the room, and finally It flows back to the first brine pump 13 again.

The second brine circuit: the high-temperature brine flows out of the second brine tank 10, and after being pressurized by the second brine pump 20, it flows to the second brine shut-off valve 17 (at this time, the third brine shut-off valve 18), and then enter the cooling tower 21. The cooled brine flows out from the outlet 21 b of the cooling tower, and returns to the second brine tank 10 through the first brine stop valve 16 .

4) Indoor cooling and heat pump heating

During the high temperature period in summer, indoor cooling is required, and domestic hot water is also required, but it is used when the amount of hot water required is small.

Refrigerant circuit: High-temperature and high-pressure refrigerant flows out from the outlet 1b of the compressor 1, passes through the heat exchanger of the water tank 11 (at this time, the refrigerant shut-off valve 2 is closed), and uses part of the condensation heat to heat domestic water. Then the refrigerant flows out from the heat exchanger interface 11b of the water tank 11, enters the four-way valve 3, then flows out from its interface 3c, enters the second brine tank 10, and completely condenses and releases heat. Then the refrigerant enters the high-pressure liquid storage tank 9 after passing through the second one-way stop valve 6, and the liquid refrigerant flowing out from the bottom interface 9b flows through the second throttling element 8, then depressurizes, and then enters the first brine tank 4 Boiling heat exchange, absorbing the heat of the brine, and the vaporized refrigerant flows back to the compressor 1 through the four-way valve 3 and the vapor-liquid separator 15 .

The first brine circuit: the low-temperature brine cooled by the refrigerant flows out of the first brine tank 4 and enters the indoor heat exchanger 12 to supply cooling to the room. Then the brine flows from the outlet 12 b of the indoor heat exchanger 12 to the first brine pump 13 , and flows back to the first brine tank 4 after being pressurized by the first brine pump 13 .

The second brine circuit: the high-temperature brine flows out from the second brine tank 10, to the second brine pump 20, and passes through the second brine shut-off valve 17 (at this time, the third brine shut-off valve 18 Closed) into the cooling tower 21 for cooling, the heat is transferred to the air. The cooled brine flows out from the cooling tower 21 and returns to the second brine tank 10 through the first brine stop valve 16 .

Domestic hot water branch: cold water enters from the interface 14c of the brine-water heat exchanger 14 without heating, then flows into the water tank 11, where it is heated to the required temperature and flows out from the interface 11d for use.

5) Indoor cooling and solar-assisted heat pump heating water

When the temperature is slightly lower in summer, solar energy is sufficient, and it needs to be activated when a large amount of hot water is needed while cooling the room.

Refrigerant circuit, the flow of the first refrigerant circuit is the same as that in operation mode 4).

The second brine circuit: the heated brine flows out from the second brine tank 10 to the second brine pump 20 , passes through the third brine stop valve 18 , and enters the solar heat collector 22 . The brine is further heated therein. Then the brine flows through the fourth brine shut-off valve 19 and then enters the brine-water heat exchanger to exchange heat with cold water. The cooled brine flows out from the interface 14 b and returns to the second brine tank 10 .

Domestic hot water branch: cold water enters from the interface 14c of the brine-water heat exchanger 14, is preheated by the brine from the solar collector 22, and then flows into the water tank 11, where it is heated to the required temperature Then for use.

6) Ordinary heat pump for hot water

In the case of extremely low temperature or rainy days, when the solar collector cannot provide heat at all, the cooling tower provides the heat required by the evaporator.

Refrigerant circuit: The high-temperature and high-pressure refrigerant flows out of the compressor 3 and enters the water tank 11 through the interface 11a (at this time, the refrigerant shut-off valve 2 is closed), where it condenses and releases heat to heat domestic hot water. Then the refrigerant enters the four-way valve 3, flows out from the four-way valve interface 3d, enters the first one-way stop valve 5 after passing through the first refrigerant tank 4, and then flows to the high-pressure liquid storage tank 9, from the high-pressure liquid storage tank 9 The high-pressure liquid refrigerant coming out of the bottom interface 9b enters the first throttling element 7 to throttle, and then enters the second brine tank 10 for boiling heat exchange. The low-pressure gas refrigerant flows out from the interface 10a, passes through the four-way valve 3 and steam The liquid separator 15 flows back to the compressor 1 again.

The first refrigerant circuit does not work.

The second brine circuit: the brine in the second brine tank 10 flows out from the port 10d after being cooled by the refrigerant, and enters the cooling tower after passing through the second brine pump 20 and the second brine shut-off valve 17 21 and air heat exchange (at this moment, the third brine shut-off valve 18 is closed), and the brine returns to the second brine tank 10 through the first brine shut-off valve 16 (at this time, the fourth brine shut-off valve 19 off).

Domestic hot water branch: cold water enters from the interface 14c of the brine-water heat exchanger 14 without heating, then flows into the water tank 11, where it is heated to the required temperature and flows out from the interface 11d for use.

7) Solar assisted heat pump heating water

When the temperature is low or cloudy, the solar energy cannot directly heat the domestic hot water to the required temperature, but plays an auxiliary role.

The refrigerant circuit and the first refrigerant circuit are the same as the operation mode 6).

The second brine circuit: the brine in the second brine tank 10 flows out from the port 10d after being cooled by the refrigerant, and enters the solar heat collector 22 after passing through the second brine pump 20 (at this time, the second brine Refrigerant shut-off valve 17 is closed), and the brine is heated here, and after heating, the brine returns to the second brine tank 10 after passing through the third brine shut-off valve 18 (at this time, the first brine shut-off valve 16 and the fourth brine shut-off valve 19 are closed).

Domestic hot water branch: cold water enters the interface 14c of the brine-water heat exchanger 14 to be heated by the brine, flows out from the interface 14d, and then enters the domestic hot water tank 11 to be heated. The heated water flows out from the interface 11d for use.

8) Ordinary solar hot water heating

During the clear days of the transitional season, the sun is abundant.

The refrigeration circuit and the first refrigerant circuit do not work.

The second brine circuit: brine flows from the second brine tank 10 to the second brine pump 20, and then sent to the solar collector 22 (at this time, the first brine shut-off valve 16, the third brine The brine stop valve 18 and the second brine stop valve 17 are closed). The brine is heated here and flows out from the interface 22b, enters the brine-water heat exchanger 14 to exchange heat with cold water through the fourth brine shut-off valve 19, then flows out from the interface 14b, and returns to the second brine Agent box 10.

Domestic hot water branch: cold water enters from the interface 14c of the brine-water heat exchanger 14, is heated by the brine, and then flows into the water tank 11 for storage and use.

9) Brine regeneration

In winter, if the brine absorbs too much moisture from the air during use, start this mode to remove the moisture in the brine. The refrigeration circuit does not work and the first refrigerant circuit does not work. Domestic hot water branch is the same as function mode 8).

The brine flows from the second brine tank 10 to the second brine pump 20, and then part of it is sent to the solar collector 22, and part of it is sent to the cooling tower 21 to exchange heat with air through the second brine shut-off valve 17 And remove the moisture in the brine (at this time the fourth brine stop valve 19 is closed). After the solar heat collector 22 is heated, the brine flows out from the interface 22b, passes through the third brine shut-off valve 18, joins the concentrated brine flowing out of the first brine shut-off valve 16, and passes through the interface together. 14b returns to the second brine tank 10 .

Claims (6)

1. A frost-free multifunctional solar-assisted heat pump system is characterized in that it includes four parts: a refrigerant circuit, a first refrigerant circuit, a second refrigerant circuit and domestic hot water branch; the refrigerant circuit is: The high-pressure outlet (1b) of the compressor (1) is respectively connected with the first interface (2a) of the refrigerant shut-off valve (2) and the first interface (11a) of the heat exchanger of the water tank (11), and the refrigerant shut-off valve (2) The second interface (2b) of the water tank (11) is connected to the second interface (11b) of the heat exchanger and the first interface (3a) of the four-way valve (3) respectively, and the fourth interface ( 3d) It is connected to the first interface (4a) of the heat exchanger of the first brine tank (4), and the second interface (4b) of the heat exchanger of the first brine tank (4) is respectively connected to the first one-way cut-off The first port (5a) of the valve (5) and the second port (8b) of the second throttling element (8) are connected, and the second port (5b) of the first one-way stop valve (5) is respectively connected to the high-pressure liquid storage The first interface (9a) of the tank (9) and the second interface (6b) of the second one-way stop valve (6) are connected, and the second interface (9b) of the high-pressure liquid storage tank (9) is respectively connected to the second throttling The first interface (8a) of the element (8) and the first interface (7a) of the first throttling element (7) are connected, and the second interface (7b) of the first throttling element (7) is respectively connected to the second one-way The first interface (6a) of the stop valve (6) is connected to the first interface (10a) of the heat exchanger of the second brine tank (10), and the second interface of the heat exchanger of the second brine tank (10) (10b) is connected to the third port (3c) of the four-way valve (3), and the second port (3b) of the four-way valve (3) is connected to the low-pressure inlet (1a) of the compressor (1) through the gas-liquid separator (15) ), the first brine circuit: the fourth interface (4d) of the first brine tank (4) is connected to the first interface (12a) of the indoor heat exchanger (12), and the indoor heat exchanger (12) The second interface (12b) of the first brine pump (13) is connected to the first interface (13a), and the second interface (13b) of the first brine pump (13) is connected to the first brine tank ( 4) connected to the third interface (4c), the second brine circuit: the fourth interface (10d) of the second brine tank (10) and the first interface (20a) of the second brine pump (20) ), the second interface (20b) of the second brine pump (20) is connected with the first interface (17a) of the second brine shut-off valve (17) and the first interface of the solar heat collector (22) respectively. (22a) is connected, the second interface (17b) of the second brine stop valve (17) is connected with the first interface (21a) of the cooling tower (21), and the second interface (21b) of the cooling tower (21) is connected with The first interface (16a) of the first brine shut-off valve (16) is connected, and the second interface (22b) of the solar heat collector (22) is respectively connected with the second interface (18) of the third brine shut-off valve (18). 18b), the second interface (19b) of the fourth brine shut-off valve (19), and the first interface (18a) of the third brine shut-off valve (18) is connected with The second interface (16b) of the second brine shut-off valve (16) is connected to the third interface (10c) of the second brine tank (10), and the first interface of the fourth brine shut-off valve (19) (19a) is connected with the first interface (14a) of the brine-water heat exchanger (14), and the second interface (14b) of the brine-water heat exchanger (14) is connected with the second brine tank ( 10) connected to the fifth interface (10e), domestic hot water branch: the cold water inlet is connected to the third interface (14c) of the brine-water heat exchanger (14), and the brine-water heat exchanger (14 ) is connected to the third interface (11c) of the water tank (11), and the fourth interface (11d) of the water tank (11) is connected to the indoor water outlet. 2. A frost-free multifunctional solar auxiliary heat pump system according to claim 1, characterized in that said first throttling element (7) or third throttling element (8) is a manual throttling valve, Automatic throttle or capillary. 3. A frost-free multifunctional solar-assisted heat pump system according to claim 1, characterized in that the first one-way shut-off valve (5) or the second one-way shut-off valve (6) is a manual shut-off valve or automatic shut-off valve. 4. A frost-free multifunctional solar-assisted heat pump system according to claim 1, characterized in that the first one-way shut-off valve (5) or the second one-way shut-off valve (6) can be formed by a two-way shut-off valve replace. 5. A frost-free multifunctional solar-assisted heat pump system according to claim 1, characterized in that the brine-water heat exchanger (14) is a casing heat exchanger or a plate heat exchanger , the inner heat exchanger of the water tank (11), the first brine tank (4) or the second brine tank (10) is a shrouded fin heat exchanger or a bare tube immersion heat exchanger. 6. A frost-free multifunctional solar-assisted heat pump system according to claim 1, characterized in that said indoor heat exchanger (12) is an air-cooled heat exchanger.

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