CN100529553C - Multifunctional heat pump device capable of cooling and heating by floor radialization - Google Patents

Abstract

The multifunctional heat pump device for floor radiant cooling and heating relates to a multifunctional heat pump system that utilizes floor radiation to provide cooling and heating indoors and simultaneously realizes domestic hot water production. The device includes a refrigerant circulation circuit, a domestic hot water circuit and a cooling system. The heating circuit can realize five operating conditions: separate cooling, combined cooling and domestic hot water production, separate heating, combined heating and domestic hot water production, and separate domestic hot water production. The invention does not absorb heat from the supplied hot water during defrosting, greatly improves the comfort of the air conditioner, does not need to operate the four-way valve during defrosting, and greatly improves system stability and reliability.

Description

Multifunctional heat pump device for floor radiation cooling and heating

technical field

The invention relates to a multi-functional heat pump system which utilizes floor radiation to supply cooling and heating indoors and simultaneously realizes domestic hot water production, and belongs to the technical field of design and manufacture of refrigeration and air-conditioning systems.

Background technique

The energy problem has become a global problem. With the development of the economy and the continuous improvement of people's living standards, people have higher and higher requirements for the comfort of living and working environments. The intensification of energy consumption not only accelerates the consumption of fossil energy and depletion, while increasing the pollution of the environment. As an important energy-saving technology, heat pumps have been widely used in thousands of households. At present, heat pump air conditioners in most households only realize the functions of cooling in summer and heating in winter. With the improvement of life quality, people's demand for domestic hot water The water consumption also increases greatly, and most families also need to purchase water heaters (as electric water heaters, solar water heaters, gas water heaters, etc.) as the source of domestic hot water, which not only increases investment, but also has low energy utilization efficiency.

The floor radiant cooling and heating method has been proved to be a comfortable and energy-saving cooling and heating method, but the floor radiant cooling needs to add additional devices (such as replacement ventilation devices) due to the problem of floor condensation, which makes the system complicated , The initial investment is large and difficult to apply. At present, floor radiation is mainly used for heating. At the same time, conventional floor radiation cooling and heating devices have deficiencies such as slow startup and long pre-cooling (heating) time.

Therefore, while heat pump air conditioners realize cooling in summer and heating in winter, how to efficiently provide domestic hot water, improve the comfort and energy saving of air conditioners, and solve the problems of floor radiant cooling condensation, slow start-up, and long warm-up time Therefore, it is an urgent technical problem for those skilled in the art to design a multifunctional heat pump device that realizes floor radiant cooling and heating.

Contents of the invention

Technical problem: The purpose of this invention is to provide domestic hot water efficiently, improve the comfort and energy saving of the air conditioner while the heat pump air conditioner has the functions of cooling in summer and heating in winter, and solve the problem of floor radiant cooling condensation and its slow start-up, To solve problems such as long warm-up time, a multi-functional heat pump device is designed to realize floor radiant cooling and heating.

Technical solution: The multifunctional heat pump device for floor radiant cooling and heating of the present invention includes a refrigerant circulation circuit, a domestic hot water circuit and a cooling and heating circuit. Refrigerant circulation circuit includes compressor, first solenoid valve, domestic hot water heat exchanger, defrosting electric control valve, four-way valve, first heat exchanger, second solenoid valve, first one-way valve, second one-way valve One-way valve, third one-way valve, fourth one-way valve, liquid reservoir, filter, electronic expansion valve, second heat exchanger, gas-liquid separator and related connecting pipes. The output end of the compressor is divided into two paths, one path is connected to the first input end 3a of the domestic hot water heat exchanger, and the other path is connected to the first input end 3a of the domestic hot water heat exchanger through the first electromagnetic valve and combined with the first output end 3b of the domestic hot water heat exchanger. The input end 5a is also connected to the input end 15a of the second heat exchanger through the defrosting electric control valve, the first output end 5b of the four-way valve is connected to the first input end 6a of the first heat exchanger, and the first output end of the four-way valve 5b is also connected to the first output end 6b of the first heat exchanger through the second electromagnetic valve, and the first output end 6b of the first heat exchanger is connected to the input end of the liquid reservoir through the first one-way valve. An output port 6b is also connected to the input port 15a of the second heat exchanger through the first one-way valve and the second one-way valve, the output port of the liquid reservoir is connected to the input port of the electronic expansion valve through the filter, and the output port of the electronic expansion valve passes through The fourth one-way valve is connected to the input end 15a of the second heat exchanger, and the output end of the electronic expansion valve is also connected to the first output end 6b of the first heat exchanger through the third one-way valve, and the output end 15b of the second heat exchanger is connected to The second input end 5c of the four-way valve, the second output end 5d of the four-way valve is connected to the input end of the gas-liquid separator, and the output end of the gas-liquid separator is connected to the input end of the compressor; the domestic hot water circuit includes a hot water storage, The first water pump, the domestic hot water heat exchanger, the third solenoid valve, the fourth solenoid valve, the replenishment valve and related connecting pipes. The outlet of the hot water storage is connected to the inlet of the first water pump, and the outlet of the first water pump is divided into two paths, respectively connected to the second input end 3c and the third input end 3d of the domestic hot water heat exchanger, and the second input end 3c of the domestic hot water heat exchanger. The output end 3e and the third output end 3f respectively pass through the third electromagnetic valve and the fourth electromagnetic valve and are connected to the input end of the hot water storage, and the replenishment valve is connected to the bottom of the hot water storage; the cooling and heating circuit includes the first heat exchanger, The second water pump, dehumidification type fan coil unit, electric three-way regulating valve, floor buried pipe radiant heating and cooling system and related connecting pipes. The second output end 6d of the first heat exchanger is connected to the inlet of the electric three-way regulating valve, one outlet of the electric three-way regulating valve is connected to the input end of the dehumidification type fan coil unit, and the other exit port is combined with the output end of the dehumidification type fan coil unit The rear is grounded to the input end of the floor buried pipe radiant cooling and heating system, the output end of the floor buried pipe radiant cooling and heating system is connected to the input end of the second water pump, and the output end of the second water pump is connected to the second input end 6c of the first heat exchanger .

The device of the present invention includes a refrigerant circulation circuit, a domestic hot water circuit and a cooling and heating circuit, and can realize five operating conditions: individual cooling, combined cooling and domestic hot water production, independent heating, combined heating and domestic hot water production, Separate system of domestic hot water.

In the single cooling condition, the first solenoid valve installed in the refrigerant circulation circuit is opened, the second solenoid valve is closed, and the defrosting electric control valve is closed. At this time, the working process is the same as that of a conventional air-cooled chiller. The compressor sucks in and compresses and discharges through the first solenoid valve and four-way valve, condenses in the second heat exchanger, and then passes through the second one-way valve, liquid reservoir, filter, electronic expansion valve, and third one-way valve in sequence Enter the first heat exchanger, where the refrigerant evaporates and absorbs heat to produce cold water, then passes through the four-way valve again, enters the gas-liquid separator, and is sucked by the compressor to circulate again. The domestic hot water circuit stops working because the device does not produce domestic hot water: the first water pump stops running, and the third and fourth solenoid valves are closed. In the cooling and heating circuit, the chilled water comes out of the first heat exchanger and enters the electric three-way regulating valve. The chilled water enters the dehumidification fan coil unit from the outlet of the electric three-way regulating valve, and the low-temperature chilled water passes through the dehumidification fan coil unit. Dehumidify and cool down the indoor air. At this time, the dehumidifying fan coil unit is mainly used for dehumidification, which bears the humidity load of the indoor air, reduces the indoor moisture content, and ensures that there is no condensation on the floor. The chilled water flows from the dehumidifying fan coil unit. After it comes out, it is mixed with the frozen water from the other outlet of the electric three-way regulating valve and then enters the floor buried pipe radiant cooling and heating system. When the temperature rises, it enters the first heat exchanger after being pressurized by the second water pump, where it exchanges heat with the refrigerant, releases heat and lowers its own temperature, and then participates in the cycle again after coming out of the first heat exchanger.

Under the condition of combined refrigeration and domestic hot water system, the operation of the refrigerant circulation circuit is similar to that under the condition of single refrigeration, the difference is that after being compressed by the compressor, the refrigerant first enters the domestic hot water heat exchanger instead of the first electromagnetic valve (the first electromagnetic valve is closed at this time), the refrigerant releases a part of heat in the domestic hot water heat exchanger to produce domestic hot water, and the subsequent refrigerant cycle is similar to that under refrigeration conditions. The domestic hot water circuit works normally, the hot water comes out of the hot water storage tank, is sucked by the first water pump and pressurized, and then enters the domestic hot water heat exchanger (at this time, the fourth electromagnetic valve is closed, and the hot water only flows from the domestic hot water heat exchanger The second input end 3c enters the domestic hot water heat exchanger, and the area of the heat exchanger is partially utilized), and the hot water exchanges heat with the refrigerant in it, and the temperature of the hot water rises. After coming out of the domestic hot water heat exchanger, it passes through the third electromagnetic The valve enters the hot water storage. During the working process, the temperature of the hot water in the hot water storage continues to increase. When the temperature reaches the set value (such as 60°C), the domestic hot water circuit stops working (the first water pump stops running, The first solenoid valve is opened), when the hot water is consumed, the tap water enters from the replenishment valve automatically to ensure that the water volume in the hot water storage remains unchanged. When the temperature in the hot water storage is lower than the set value (such as 35°C), The domestic hot water circuit works again (the first solenoid valve is closed and the first water pump is restarted). The operation of the cooling and heating system is consistent with that under the single cooling condition.

Under the condition of heating alone, the refrigerant circulation circuit is that the first solenoid valve of the device is opened, the second solenoid valve is closed, and the defrosting electric control valve is closed. After being inhaled and compressed by the compressor, the agent passes through the first solenoid valve and four-way valve, condenses and releases heat in the first heat exchanger to produce hot water, and then passes through the first one-way valve, liquid storage, filter, The electronic expansion valve and the fourth one-way valve enter the second heat exchanger, where the refrigerant evaporates and absorbs heat, then passes through the four-way valve again, enters the gas-liquid separator, and is sucked by the compressor for recirculation. The domestic hot water circuit stops working (the first water pump stops running). During normal operation, the hot water in the cooling and heating circuit comes out of the first heat exchanger and enters the electric three-way regulating valve, and the electric three-way regulating valve closes the flow into the dehumidification fan coil unit, and all the hot water directly enters the floor buried pipe Radiant cooling and heating system, in which the hot water radiates heat through the floor to increase the temperature of the air in the room, and at the same time reduce its own temperature. After being pressurized by the second water pump, it enters the first heat exchanger, where it exchanges heat with the refrigerant. It absorbs heat, and at the same time its own temperature rises, and it participates in the cycle again after coming out of the first heat exchanger. At the beginning of indoor heating, because the floor needs to store heat when the floor radiant heating starts, the heat is dissipated slowly. When it starts to run, the electric three Through the regulating valve, all the hot water enters the dehumidification fan coil unit, and the hot water heats the indoor air through the dehumidification fan coil unit, so that the room temperature can quickly rise to the set value, and the floor buried pipe radiant cooling and heating system preheats the floor When the radiant heat to the room increases, gradually turn down the electric three-way regulating valve to enter the hot water of the dehumidification type fan coil until it is completely closed. At this time, only the floor buried pipe radiant heating system is used to supply heat to the room.

Under the combined heating and domestic hot water operating conditions, the operation of the refrigerant circulation circuit of the device is similar to that under the heating operating conditions, the difference is that after the refrigerant is compressed by the compressor, it first enters the domestic hot water heat exchanger instead of the first A solenoid valve (the first solenoid valve is closed), at this time, the refrigerant releases a part of heat in the domestic hot water heat exchanger to produce domestic hot water, and the subsequent refrigerant cycle is similar to that under heating conditions. The domestic hot water circuit works normally, and the working process is similar to that under the combined cooling and hot water heating conditions, and the hot water circulation in the cooling and heating circuit is similar to that under the individual heating conditions.

Under the condition of domestic hot water production alone, the refrigerant circulation circuit is that the first solenoid valve of the device is closed, the second solenoid valve is opened, the defrosting electric control valve is closed, and the refrigerant enters the domestic hot water for heat exchange after being sucked by the compressor and compressed. Refrigerant in which the heat is released and all condensed into liquid to produce domestic hot water, then through the four-way valve, the second solenoid valve, and then through the first one-way valve, liquid receiver, filter, electronic expansion valve, The fourth one-way valve enters the second heat exchanger, where the refrigerant evaporates and absorbs heat, then passes through the four-way valve again, enters the gas-liquid separator, and is sucked by the compressor to circulate again. The domestic hot water circuit works normally. After the hot water comes out of the hot water reservoir, it is sucked and pressurized by the first water pump and then divided into two paths to enter the domestic hot water heat exchanger (at this time, both the third solenoid valve and the fourth solenoid valve are open. The heat exchange area of the heat exchanger is fully utilized), the hot water exchanges heat with the refrigerant in it, the temperature of the hot water rises, and after coming out of the domestic hot water heat exchanger, the hot water passes through the third solenoid valve or the fourth solenoid valve and then merges Then enter the hot water storage, during the working process, the temperature of the hot water in the hot water storage continues to increase, when the temperature reaches the set value (such as 60 ℃), the domestic hot water circuit stops working (the first water pump stops running) , the whole device also stops running. When the hot water is consumed, the tap water enters automatically from the replenishment valve to ensure that the water volume in the hot water storage remains unchanged. When the temperature in the hot water storage is lower than the set value (such as 35°C), The hot water system works again (the first water pump restarts), that is, the whole device restarts.

Under heating conditions, combined heating and domestic hot water conditions, there are problems of frosting and defrosting on the surface of the second heat exchanger. The device of the present invention adopts a sensible heat defrosting method. When the operation is transferred to the defrosting work, the four-way valve of the device does not switch, and still maintains the position under the heating condition. At this time, the electronic expansion valve is completely closed, and the defrosting electric control valve is opened. At this time, the refrigerant circulation circuit is as follows: after the refrigerant is sucked and compressed by the compressor from the gas-liquid separator, because the electronic expansion valve is completely closed, the refrigerant that came out of the compressor during the heating operation passes through the four-way valve, the second As soon as the heat exchanger (or the second electromagnetic valve), the first one-way valve, the liquid reservoir, the flow path from the filter to the electronic expansion valve is blocked, the refrigerant coming out of the compressor will directly pass through the defrosting electric control valve Arriving at the input end 15a of the second heat exchanger, the superheated steam of the high-temperature and high-pressure refrigerant is throttled by the defrosting electric control valve and then becomes a high-temperature and low-pressure steam. The refrigerant exchanges heat in the second heat exchanger, and the heat passes through the The tube wall of the device transmits the frost layer outside the tube, thereby removing the frost layer, and at the same time, the temperature of the refrigerant itself decreases. When the opening of the defrosting electric control valve is adjusted to control the flow of the refrigerant in the second heat exchanger, it can be ensured that the refrigerant in the second heat exchanger only cools down and releases sensible heat without condensing into liquid. The refrigerant comes out from the output end 15b of the second heat exchanger and returns to the gas-liquid separator through the four-way valve, and then is sucked and compressed by the compressor again, and participates in the cycle again for defrosting. When the device is defrosting, the domestic hot water circuit and the cooling and heating circuit all stop working (the first water pump and the second water pump both stop working).

Beneficial effects: the present invention relates to a multi-functional heat pump system that utilizes floor radiation to provide cooling and heating to the room, and at the same time realizes the production of domestic hot water. It has the following characteristics:

1. The floor radiant cooling and heating multifunctional air-conditioning device proposed by the present invention can use the same set of floor buried pipe radiation structure to provide cooling capacity in summer and heat in winter.

2. The present invention adopts a dehumidification type fan coil unit, which can handle the air humidity load in summer, prevent floor condensation, and at the same time accelerate indoor pre-cooling (heating) in the initial stage of cooling or heating, and make up for the shortcomings of slow floor radiation start-up .

3. The present invention can provide domestic hot water while realizing refrigeration and heating throughout the year.

4. The present invention does not absorb heat from the hot water supplied during defrosting, greatly improving the comfort of the air conditioner, the four-way valve does not need to operate during defrosting, and greatly improving system stability and reliability.

Description of drawings

Fig. 1 is a schematic diagram of a multifunctional heat pump device for floor radiant cooling and heating of the present invention.

In Fig. 1 there are: compressor 1; first solenoid valve 2; domestic hot water heat exchanger 3; first input end 3a of domestic hot water heat exchanger; first output end 3b of domestic hot water heat exchanger; The second input end 3c of the heat exchanger; the third input end 3d of the domestic hot water heat exchanger; the second output end 3e of the domestic hot water heat exchanger; the third output end 3f of the domestic hot water heat exchanger; the defrosting electric control valve 4; four-way valve 5; four-way valve first input end 5a; four-way valve first output end 5b; four-way valve second input end 5c; four-way valve second output end 5d; first heat exchanger 6; The first input end 6a of the first heat exchanger; the first output end 6b of the first heat exchanger; the second input end 6c of the first heat exchanger; the second output end 6d of the first heat exchanger; the second solenoid valve 7; The first one-way valve 8; the second one-way valve 9; the liquid reservoir 10; the filter 11; the electronic expansion valve 12; the third one-way valve 13; the fourth one-way valve 14; the second heat exchanger 15; Second heat exchanger input end 15a; second heat exchanger output end 15b; gas-liquid separator 16; hot water storage tank 17; first water pump 18; third solenoid valve 19; fourth solenoid valve 20; Dehumidification type fan coil unit 22; electric three-way regulating valve 23; floor buried pipe radiant cooling and heating system 24; second water pump 25.

Figure 2 is a structural diagram of the domestic hot water heat exchanger.

The heat exchanger in Fig. 2 has 3 fluid channels: a-b, c-e, d-f. Channel a-b goes through the shell layer, and channels c-e and channel d-f go through the tube side respectively. When the fluid only goes through one shell layer and one tube side, it means that only part of the heat exchanger area is used, and the fluid only goes through one shell layer and two ways The entire heat exchanger area of the tube side can be fully utilized, so the area of the heat exchanger can be adjusted by controlling the number of fluids passing through the tube side, thereby realizing the adjustment of the amount of heat exchange.

Detailed ways

The specific embodiment of the present invention is further described in conjunction with accompanying drawing 1: the floor radiant cooling and heating multifunctional heat pump device of the present invention includes a refrigerant circulation circuit, a domestic hot water circuit and a cooling and heating circuit. The specific connection method is: the output end of the compressor 1 is divided into two routes, one is connected to the first input end 3a of the domestic hot water heat exchanger, and the other is connected to the first output end 3b of the domestic hot water heat exchanger through the first solenoid valve 2 After the combination, it is connected to the first input end 5a of the four-way valve, and is also connected to the input end 15a of the second heat exchanger through the defrosting electric control valve 4, and the first output end 5b of the four-way valve is connected to the first input end 6a of the first heat exchanger At the same time, the first output end 5b of the four-way valve is also connected to the first output end 6b of the first heat exchanger through the second solenoid valve 7, and the first output end 6b of the first heat exchanger is connected to the liquid reservoir through the first one-way valve 8 10, while the first output end 6b of the first heat exchanger is also connected to the input end 15a of the second heat exchanger through the first one-way valve 8 and the second one-way valve 9, and the output end of the liquid reservoir 10 is filtered The device 11 is connected to the input end of the electronic expansion valve 12, the output end of the electronic expansion valve 12 is connected to the input end 15a of the second heat exchanger through the fourth one-way valve 14, and the output end of the electronic expansion valve 12 is also passed through the third one-way valve 13 Connect to the first output end 6b of the first heat exchanger, the output end 15b of the second heat exchanger is connected to the second input end 5c of the four-way valve, the second output end 5d of the four-way valve is connected to the input end of the gas-liquid separator 16, and the gas The output end of the liquid separator 16 is connected to the input end of the compressor 1; the outlet of the hot water storage 17 is connected to the inlet of the first water pump 18, and the outlet of the first water pump 18 is divided into two paths, respectively connected to the second The input end 3c and the third input end 3d, the second output end 3e and the third output end 3f of the domestic hot water heat exchanger pass through the third electromagnetic valve 19 and the fourth electromagnetic valve 20 respectively, and are connected to the input end of the hot water storage tank 17 , the replenishment valve 21 is connected to the bottom of the hot water storage 17; the second output end 6d of the first heat exchanger 6 is connected to the inlet of the electric three-way regulating valve 23, and one outlet of the electric three-way regulating valve 23 is connected to the dehumidification type fan coil unit 22 The input end, the other outlet is combined with the output end of the dehumidification type fan coil unit 22 and grounded to the input end of the buried pipe radiant cooling and heating system 24, and the output end of the buried pipe radiant cooling and heating system 24 is connected to the second water pump 25 The input end, the output end of the second water pump 25 is connected with the second input end 6c of the first heat exchanger.

Under the condition of single cooling, the refrigerant circulation circuit is that the first electromagnetic valve 2 of the device is opened, the second electromagnetic valve 7 is closed, and the defrosting electric control valve 4 is closed. The refrigerant is sucked and compressed by the compressor 1 and then discharged through the first electromagnetic valve. Valve 2 enters from the first input end 5a of the four-way valve, and enters the second heat exchanger 15 from the end 5c, where the refrigerant condenses into a liquid and then comes out from the end of the second heat exchanger 15a, and then passes through the second unit in turn. The directional valve 9, the liquid receiver 10, the filter 11, and the electronic expansion valve 12 are throttled into two phases of gas and liquid, and then enter the first heat exchanger 6 from the third one-way valve 13, where the refrigerant evaporates and absorbs heat, making Take cold water, the refrigerant comes out from the first input end 6a of the first heat exchanger, enters the four-way valve 5 through the first output end 5b of the four-way valve, and then enters the gas-liquid separator 16 from the second output end 5d of the four-way valve , after coming out of the gas-liquid separator 16, it is sucked into the compressor 1 and circulated again. The domestic hot water circuit stops working because the device does not produce domestic hot water: the first water pump 18 stops running, and the third solenoid valve 19 and the fourth solenoid valve 20 are closed.

In the cooling and heating circuit, the chilled water comes out of the first heat exchanger 6 and enters the electric three-way regulating valve 23. The chilled water enters the dehumidification type fan coil unit 22 from one outlet of the electric three-way regulating valve 23, and the chilled water flows from the dehumidification type After the fan coil unit 22 comes out, it is mixed with the frozen water from the other outlet of the electric three-way regulating valve 23 and then enters the floor buried pipe radiant cooling and heating system 24. The heat exchanger 6 exchanges heat with the refrigerant, releases heat and lowers its own temperature, and participates in the cycle again after coming out of the first heat exchanger 6 .

Under the condition of combined refrigeration and domestic hot water system, the operation of the refrigerant circulation circuit is similar to that under the condition of single refrigeration, the difference is that after being compressed by the compressor 1, the refrigerant first enters the domestic hot water heat exchanger 3 instead of A solenoid valve 2 (at this moment, the first solenoid valve 2 is closed), and the refrigerant releases a part of heat in the domestic hot water heat exchanger 3 to produce domestic hot water. The subsequent refrigerant cycle is similar to that under refrigeration conditions. The hot water in the domestic hot water circuit comes out of the hot water reservoir 17 and is sucked and pressurized by the first water pump 18 and then enters the domestic hot water heat exchanger 3 (at this time, the fourth electromagnetic valve 20 is closed, and the hot water is only exchanged from the domestic hot water. The second input end 3c of the heater enters the domestic hot water heat exchanger 3), where the hot water exchanges heat with the refrigerant, and the temperature of the hot water rises. After coming out of the domestic hot water heat exchanger 3, it passes through the third solenoid valve 19 Enter the hot water storage 17, in the working process, the temperature of the hot water in the hot water storage 17 is constantly increasing, when the temperature reaches the set value, the domestic hot water circuit stops working (the first water pump 18 stops running, the first electromagnetic Valve 2 is open), when the hot water is consumed, the tap water will automatically enter from the replenishment valve 25 to ensure that the water volume in the hot water storage 17 remains unchanged. When the temperature in the hot water storage 17 is lower than the set value, the domestic hot water circuit Work again (the first electromagnetic valve 2 is closed, and the first water pump 18 runs again). The operation of the cooling and heating circuit is consistent with that under the condition of cooling alone.

Under the condition of heating alone, the refrigerant circulation circuit is that the first electromagnetic valve 2 of the device is opened, the second electromagnetic valve 7 is closed, and the defrosting electric control valve 4 is closed. After being sucked and compressed by the compressor 1, the refrigerant passes through the first electromagnetic Valve 2 enters the first input end 5a of the four-way valve, and then enters the first heat exchanger 6 after exiting the first output end 5b of the four-way valve. The refrigerant condenses in the first heat exchanger 6 to release heat to produce hot water , and then enter the second heat exchanger 15 through the first one-way valve 8, the accumulator 10, the filter 11, the electronic expansion valve 12, and the fourth one-way valve 14, in which the refrigerant evaporates and absorbs heat, and then from the first It comes out of the second heat exchanger 15 and enters again from the second input end 5c of the four-way valve, and enters the gas-liquid separator 16 after exiting the end 5d, and is then sucked by the compressor 1 to circulate again. The domestic hot water circuit stops working (the first water pump 18 stops running). During normal operation, the hot water in the cooling and heating circuit comes out of the first heat exchanger 6 and enters the electric three-way regulating valve 23, and the electric three-way regulating valve 23 closes the flow entering the dehumidification type fan coil unit 22, and all the hot water is directly Enter the floor buried pipe radiant cooling and heating system 24, where the hot water radiates heat through the floor to increase the temperature of the air in the room, and at the same time reduce its own temperature. After being pressurized by the second water pump 25, it enters the first heat exchanger 6, where It exchanges heat with the refrigerant, absorbs heat, and at the same time its own temperature rises, and participates in the cycle again after coming out of the first heat exchanger 6 .

At the initial stage of indoor heating, the electric three-way regulating valve 23 sends all the hot water into the dehumidifying fan coil unit 22, and the hot water passes through the dehumidifying fan coil unit 22 to heat the indoor air, so that the room temperature can quickly rise to the set value, and the floor When the buried pipe radiant cooling and heating system 24 has preheated the floor well and radiated heat into the room, the amount of hot water entering the dehumidification fan coil unit 22 from the electric three-way regulating valve 23 is gradually reduced until it is completely closed. A floor buried pipe radiant heating system is used to supply heat to the room.

Under the combined heating and domestic hot water operating conditions, the operation of the refrigerant circulation loop of the device is similar to that under the heating operating conditions, the difference is that the refrigerant first enters the domestic hot water heat exchanger 3 after being compressed by the compressor 1 Not the first solenoid valve 2 (the first solenoid valve 2 is closed), at this time the refrigerant releases a part of heat in the domestic hot water heat exchanger 3 to produce domestic hot water, and the subsequent refrigerant cycle is similar to that under heating conditions. The domestic hot water circuit works normally, and the working process is similar to that under the combined cooling and hot water heating conditions, and the hot water circulation in the cooling and heating circuit is similar to that under the individual heating conditions.

Under the condition of domestic hot water production alone, the refrigerant circulation circuit is that the first solenoid valve 2 of the device is closed, the second solenoid valve 7 is opened, and the defrosting electric control valve 4 is closed. The refrigerant enters the living room after being sucked and compressed by the compressor 1. Hot water heat exchanger 3, in which all the refrigerant condenses and releases heat to produce domestic hot water, then passes through the four-way valve 5, the second solenoid valve 7, and then sequentially passes through the first one-way valve 8, the liquid reservoir 10, The filter 11, the electronic expansion valve 12, and the fourth one-way valve 14 enter the second heat exchanger 15, where the refrigerant evaporates and absorbs heat, and then passes through the four-way valve 5 again, enters the gas-liquid separator 16, and is compressed by the compressor 1 Inhale and cycle again. The domestic hot water circuit works normally, because the hot water comes out from the hot water reservoir 17 and is inhaled and pressurized by the first water pump 18 and then divided into two paths to enter the domestic hot water heat exchanger 3 (at this time, the third electromagnetic valve 19 and the fourth electromagnetic valve valves 20 are all open), the hot water exchanges heat with the refrigerant in it, the temperature of the hot water rises, and after coming out of the domestic hot water heat exchanger 3, the hot water passes through the third solenoid valve 19 or the fourth solenoid valve 20 and then merges Then enter the hot water storage 17, in the course of work, the hot water temperature in the hot water storage 17 constantly improves, when the temperature reaches the set value, the domestic hot water circuit stops working (the first water pump 18 stops running), and the whole The device also stops running. When the hot water is consumed, tap water enters automatically from the replenishment valve 25 to ensure that the water volume in the hot water storage 17 remains unchanged. When the temperature in the hot water storage 17 is lower than the set value, the domestic hot water circuit Work again (the first water pump 18 runs again), that is, the whole device also restarts and works.

In the heating condition, combined heating and hot water heating condition, when the heating operation is transferred to the defrosting operation, in the refrigerant circulation circuit, the first solenoid valve 2 is opened, the second solenoid valve 7 is closed, and the electronic expansion The valve 12 is closed, and the defrosting electric control valve 4 is opened to work. The refrigerant inhaled from the gas-liquid separator 16 is compressed by the compressor 1 and then discharged. After passing through the first electromagnetic valve 2, it will directly pass through the defrosting electric control valve 4 and reach the input end 15a of the second heat exchanger. Heat exchange is carried out in the heat exchanger 15, and the heat will be transferred to the frost layer outside the tube through the tube wall of the heat exchanger, thereby removing the frost layer, and simultaneously the temperature of the refrigerant itself is reduced. When the valve opening of the defrosting electric control valve 4 is controlled, that is, when the flow rate of the refrigerant entering the second heat exchanger 15 is adjusted, the refrigerant in the second heat exchanger can only be lowered in temperature, releasing sensible heat without condensing into liquid. The refrigerant comes out from the output end 15b of the second heat exchanger and returns to the gas-liquid separator 16 through the four-way valve 5, and then is sucked and compressed by the compressor 1 again, and participates in the cycle again for defrosting. When the device is defrosted, the domestic hot water circuit and the cooling and heating circuit all stop working (the first water pump 18 and the second water pump 25 all stop working).

Claims (3)

1. A multifunctional heat pump device for floor radiant cooling and heating, characterized in that the device includes a refrigerant circulation circuit, a domestic hot water circuit and a cooling and heating circuit; In the refrigerant circulation circuit, the output end of the compressor (1) is divided into two paths, one path is connected to the first input end (3a) of the domestic hot water heat exchanger, and the other path exchanges heat with the domestic hot water through the first electromagnetic valve (2) The first output end (3b) of the four-way valve (5) is connected to the first input end (5a) of the four-way valve (5) after being combined, and the first input end (5a) of the four-way valve is connected to the second defrosting electric control valve (4) The second heat exchanger input end (15a) of the second heat exchanger (15), the first output end (5b) of the four-way valve is connected to the first heat exchanger first input end (6a) of the first heat exchanger (6) ), at the same time, the first output end (5b) of the four-way valve is also connected to the first output end (6b) of the first heat exchanger through the second electromagnetic valve (7), and the first output end (6b) of the first heat exchanger passes through the second A one-way valve (8) is connected to the input end of the liquid reservoir (10), and at the same time, the first output end (6b) of the first heat exchanger also passes through the first one-way valve (8), the second one-way valve (9) Connect to the input end of the second heat exchanger (15a), the output end of the liquid reservoir (10) is connected to the input end of the electronic expansion valve (12) through the filter (11), and the output end of the electronic expansion valve (12) passes through the fourth The one-way valve (14) is connected to the input end (15a) of the second heat exchanger, and the output end of the electronic expansion valve is also connected to the first output end (6b) of the first heat exchanger through the third one-way valve (13). The output end (15b) of the second heat exchanger is connected to the second input end (5c) of the four-way valve, and the second output end (5d) of the four-way valve is connected to the input end of the gas-liquid separator (16), and the gas-liquid separator (16) ) is connected to the input end of the compressor (1); In the domestic hot water circuit, the outlet of the hot water storage (17) is connected to the inlet of the first water pump (18), and the outlet of the first water pump (18) is divided into two paths, respectively connected to the second input end of the domestic hot water heat exchanger ( 3c), the third input end (3d), the second output end (3e) of the domestic hot water heat exchanger, and the third output end (3f) of the domestic hot water heat exchanger pass through the third solenoid valve (19), the fourth The solenoid valve (20) is connected to the input end of the hot water storage device (17), and the replenishment valve (21) is connected to the bottom of the hot water storage device (17); In the cooling and heating circuit, the second output end (6d) of the first heat exchanger is connected to the inlet of the electric three-way regulating valve (23), and one outlet of the electric three-way regulating valve (23) is connected to the dehumidification type fan coil unit (22) The input end of the other outlet is combined with the output end of the dehumidification type fan coil unit (22) and grounded to the input end of the floor buried pipe radiant cooling and heating system (24), and the output of the floor buried pipe radiant cooling and heating system (24) The terminal is connected with the input end of the second water pump (25), and the output end of the second water pump (25) is connected with the second input port (6c) of the first heat exchanger. 2. The multifunctional heat pump device for floor radiant cooling and heating according to claim 1, characterized in that the domestic hot water heat exchanger (3) has three fluid channels: the first input of the domestic hot water heat exchanger Terminal (3a) - first output terminal of domestic hot water heat exchanger (3b), second input terminal of domestic hot water heat exchanger (3c) - second output terminal of domestic hot water heat exchanger (3e), domestic hot water The third input end of the heat exchanger (3d) - the third output end of the domestic hot water heat exchanger (3f), the first input end of the domestic hot water heat exchanger (3a) - the first output end of the domestic hot water heat exchanger ( 3b) This passage goes through the shell side, the second input end of the domestic hot water heat exchanger (3c) - the second output end of the domestic hot water heat exchanger (3e) and the third input end of the domestic hot water heat exchanger (3d) - The two channels of the third output end (3f) of the domestic hot water heat exchanger go through the tube side. By changing the number of channels through the tube side, the requirements of the heat exchanger are different under the joint working condition and the single hot water heating condition. Adjustment of heat exchange area. 3. The multi-functional heat pump device for floor radiant cooling and heating according to claim 1, characterized in that the dehumidification type fan coil unit described in the device has the main function of dehumidification when cooling in summer, and is used for cooling in winter. Heat is dominated by large heat exchange.

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