CN113899103B

CN113899103B - Engine-driven air source heat pump unit

Info

Publication number: CN113899103B
Application number: CN202111386620.XA
Authority: CN
Inventors: 张小力
Original assignee: Shanghai Airute Air Conditioning System Co ltd
Current assignee: Shanghai Airute Air Conditioning System Co ltd
Priority date: 2021-11-22
Filing date: 2021-11-22
Publication date: 2023-03-31
Anticipated expiration: 2041-11-22
Also published as: CN113899103A

Abstract

The invention provides an engine-driven air source heat pump unit, which is used for producing hot water or hot air and comprises an engine, a transmission device, a compressor, a first heat exchanger and a second heat exchanger, wherein the compressor is provided with an exhaust port and an air suction port, the first heat exchanger is provided with a first refrigerant inlet and a first refrigerant outlet, the second heat exchanger is provided with a first circulation port and a second circulation port, and the engine-driven air source heat pump unit is characterized by also comprising: the smoke-gas refrigerant heat exchanger, the cooling water refrigerant heat exchanger and the refrigerant three-way valve are arranged in the smoke-gas refrigerant heat exchanger, refrigerant in the smoke-gas refrigerant heat exchanger absorbs heat from smoke gas in a smoke exhaust pipeline of the engine and evaporates, refrigerant in the cooling water refrigerant heat exchanger absorbs heat from cooling water and evaporates, the refrigerant side of the cooling water refrigerant heat exchanger is connected with the refrigerant side of the smoke-gas refrigerant heat exchanger in series or in parallel, and the second circulation port is connected with the exhaust port and the air suction port through the refrigerant three-way valve respectively. In the unit, air flows through the second heat exchanger without frosting, and frostless operation is realized.

Description

Engine-driven air source heat pump unit

Technical Field

The invention belongs to the technical field of heat pumps, and particularly relates to an engine-driven air source heat pump unit.

Background

The boiler widely adopted at present consumes much primary energy, has high operating cost and generates a large amount of carbon emission. The air source heat pump driven by the engine has the characteristics of high efficiency, low operating cost and low carbon emission level, and with the implementation of a sustainable development strategy and the continuous enhancement of energy-saving and environment-friendly consciousness, the biomass or solar energy synthetic fuel is adopted, and the development of the high-efficiency engine-driven air source heat pump to replace a boiler or cogeneration is a necessary choice. The air source heat pump driven by the engine has obvious economic benefit and environmental protection benefit, but the air source heat pump also has certain defects, when the air source heat pump operates in an outdoor low-temperature high-humidity section, moisture in air with the temperature lower than a dew point temperature can be condensed on the outer surface of an evaporator, and if the temperature of the outer surface of the evaporator is lower than zero, the air source heat pump can frost. At the moment, the efficiency of the air source heat pump is quickly attenuated, and if the air source heat pump can run without frost, the heat can be stably supplied, and the efficiency of the air source heat pump can be reduced in a limited way. When frosting, the frosting on the surface of the evaporator influences the heat supply capacity of the air source heat pump and even influences the normal operation of the air source heat pump, and a frost layer on the evaporator needs to be removed in time.

The air source heat pump mostly adopts the traditional defrosting mode of four-way reversing valve switching, the pipeline of the method is complex, heat can not be produced or the heat production quantity is greatly reduced during defrosting, and abnormal sound can be caused during four-way valve switching. At present, the improvement of the traditional defrosting mode by adopting a bypass throttling mode or a reverse defrosting mode with refrigerant compensation and the like obtains better effect, but still has the problem that heating cannot be carried out during defrosting, and even refrigeration is carried out instead. Although several defrosting modes, namely heat storage defrosting, hot gas bypass defrosting and air return heating defrosting, can solve the problem that heat cannot be generated during defrosting operation, some problems still exist, for example, a phase change material used for heat storage defrosting needs to be well matched with heat required by defrosting, and a gas-liquid separator with large capacity needs to be arranged in a system for hot gas bypass defrosting and air return heating defrosting, so that the defrosting cost is increased in multiples. And these several modes can not guarantee the heating effect of unit when the defrosting, have still brought the too high problem of energy consumption when the defrosting.

The patent publication No. CN112728810 previously applied by the applicant discloses an air source heat pump unit, which is provided with a gas engine, a transmission device, a compressor, a first throttle valve, a second throttle valve, a first heat exchanger, a second heat exchanger and a flue gas heat exchanger, wherein a first switching valve is arranged between the second heat exchanger and an air suction port, a second switching valve is arranged between the second heat exchanger and an air exhaust port, a third switching valve is arranged between the second heat exchanger and the flue gas heat exchanger, the first switching valve is opened, the second switching valve and the third switching valve are closed, and the unit is in a heating mode; the first switching valve is closed, the second switching valve and the third switching valve are opened, the unit is in a defrosting mode, the first switching valve and the second switching valve are used for controlling the mode switching, and defrosting can be carried out while heat supply is carried out.

However, the subsequent research of the applicant finds that the air source heat pump unit in the patent has the problems of insufficient heat exchange amount, overlong defrosting time and poor defrosting effect.

Disclosure of Invention

The present invention has been made to solve the above problems, and an object of the present invention is to provide an engine-driven air source heat pump unit.

The invention provides an engine-driven air source heat pump unit, which is used for producing hot water or hot air and comprises an engine, a transmission device, a compressor, a first heat exchanger and a second heat exchanger, wherein the compressor is provided with an exhaust port and an air suction port, the first heat exchanger is provided with a first refrigerant inlet and a first refrigerant outlet, the second heat exchanger is provided with a first circulation port and a second circulation port, and the engine-driven air source heat pump unit is characterized by further comprising: the smoke-gas refrigerant heat exchanger, the cooling water refrigerant heat exchanger and the refrigerant three-way valve are arranged in the smoke-gas refrigerant heat exchanger, refrigerant in the smoke-gas refrigerant heat exchanger absorbs heat from smoke gas in a smoke exhaust pipeline of the engine and evaporates, refrigerant in the cooling water refrigerant heat exchanger absorbs heat from cooling water and evaporates, the refrigerant side of the cooling water refrigerant heat exchanger is connected with the refrigerant side of the smoke-gas refrigerant heat exchanger in series or in parallel, and the second circulation port is connected with the exhaust port and the air suction port through the refrigerant three-way valve respectively.

The engine-driven air source heat pump unit provided by the invention can also have the following characteristics: wherein, engine drive air source heat pump set's operational mode includes heating mode and defrosting mode: in the heating mode, after the refrigerant from the exhaust port releases heat and condenses in the first heat exchanger, the refrigerant enters the second heat exchanger to absorb heat and evaporate, then flows through the refrigerant three-way valve, and returns to the compressor from the air suction port after the smoke refrigerant heat exchanger absorbs heat and evaporates; in the defrosting mode, the refrigerant from the exhaust port flows into the second heat exchanger through the refrigerant three-way valve, releases heat and condenses, then enters the smoke refrigerant heat exchanger and the cooling water refrigerant heat exchanger to absorb heat and evaporate, and finally returns to the compressor through the air suction port.

The engine driving air source heat pump unit provided by the invention can also have the following characteristics: in the heating mode, after the refrigerant from the exhaust port releases heat and condenses in the first heat exchanger, the refrigerant enters the second heat exchanger to absorb heat and evaporate, then flows through the refrigerant three-way valve, absorbs heat and evaporates in the smoke refrigerant heat exchanger and the cooling water refrigerant heat exchanger, and then returns to the compressor from the air suction port.

The engine driving air source heat pump unit provided by the invention can also have the following characteristics: and a first throttling valve is arranged between the first refrigerant outlet and the flue gas refrigerant heat exchanger.

The engine driving air source heat pump unit provided by the invention also has the following characteristics that: the system comprises a flue gas cooling water heat exchanger, a cooling water pump, a thermostat, a cooling water three-way valve and a radiator, wherein flue gas of an engine sequentially enters the flue gas cooling water heat exchanger and a flue gas refrigerant heat exchanger so as to release heat to cooling water and a refrigerant respectively, the first heat exchanger and the radiator are connected in series or in parallel, hot water or hot air sequentially or respectively enters the first heat exchanger and the radiator for heating, and the cooling water is antifreeze or water.

The engine-driven air source heat pump unit provided by the invention can also have the following characteristics: the cooling water is pressurized by the cooling water pump, flows through the flue gas cooling water heat exchanger and the engine, is heated and heated, enters the thermostat, and directly flows back to the cooling water pump when the temperature of the cooling water entering the thermostat is low; when the temperature of the cooling water entering the thermostat is high, the cooling water flows back to the cooling water pump after flowing through the cooling water three-way valve and the radiator.

The engine-driven air source heat pump unit provided by the invention can also have the following characteristics: in the defrosting mode, cooling water is pressurized by the cooling water pump, flows through the flue gas cooling water heat exchanger and the engine for heating, enters the thermostat, flows through the cooling water three-way valve and the cooling water refrigerant heat exchanger, and then flows back to the cooling water pump.

The engine driving air source heat pump unit provided by the invention can also have the following characteristics: during the heating mode or the defrosting mode, cooling water is pressurized by the cooling water pump, flows through the flue gas cooling water heat exchanger and the engine for heating, enters the thermostat, flows through the cooling water three-way valve, the cooling water refrigerant heat exchanger and the radiator, and then flows back to the cooling water pump.

The engine driving air source heat pump unit provided by the invention can also have the following characteristics: the cooling water refrigerant heat exchanger is any one of a finned coil heat exchanger, a plate-fin heat exchanger, a plate-shell heat exchanger and a sleeve heat exchanger.

The engine-driven air source heat pump unit provided by the invention can also have the following characteristics: wherein, the material of the flue gas refrigerant heat exchanger is stainless steel.

Action and Effect of the invention

According to the engine-driven air source heat pump unit (hereinafter referred to as unit) related to the invention, when the unit is in a heating mode, after heat of refrigerant gas discharged from the compressor is released to the first heat exchanger, the refrigerant enters the second heat exchanger, and after heat of the refrigerant is absorbed by the flue gas refrigerant heat exchanger, the refrigerant returns to the compressor.

In the area with high air humidity and easy frosting, the flue gas refrigerant heat exchanger and the cooling water refrigerant heat exchanger are used as evaporators, so that the burden of the second heat exchanger is shared, the frosting problem of the unit is avoided, air flows through the second heat exchanger without frosting, and frostless operation is realized.

When the unit is in a defrosting mode, refrigerant gas discharged from the compressor is divided into two paths, one path of the refrigerant gas flows to the first heat exchanger to release heat, the other path of the refrigerant gas flows to the second heat exchanger through the refrigerant three-way valve to release heat, and the two paths of the refrigerant gas are converged to enter the flue gas refrigerant heat exchanger and the cooling water refrigerant heat exchanger to absorb heat and evaporate and then return to the compressor. The first heat exchanger is always used as a condenser in the defrosting mode, and can supply heat to the environment temperature in a sufficient amount, so that the problem that the heat supply of a unit is unstable or the heat supply cannot be realized in the defrosting mode is solved. Meanwhile, the system of the unit is not stopped when the heating mode and the defrosting mode are switched, and defrosting is synchronously realized only by accelerating the speed of the engine, so that the heat supply stability of the unit is further ensured.

In addition, the unit mainly controls mode switching through the refrigerant three-way valve respectively, and equipment pipelines are simpler, so that the refrigerant gas resistance is reduced, the unit cost is reduced, and the working efficiency of the unit is improved.

In conclusion, the engine-driven air source heat pump unit has the advantages of simple equipment pipeline, high working efficiency and stable heat supply, can defrost the air source heat pump unit or realize frost-free heating operation while supplying heat, saves energy consumption, reduces cost and prolongs the service life of the equipment.

Drawings

FIG. 1 is a schematic view illustrating the connection and flow of the main body of an engine-driven air source heat pump unit according to a first embodiment of the present invention;

FIG. 2 is a schematic view illustrating the connection and flow of the peripheral parts of an engine-driven air source heat pump unit according to a first embodiment of the present invention;

FIG. 3 is a schematic view of the connection and flow of the main body of an engine-driven air source heat pump unit according to a second embodiment of the present invention;

FIG. 4 is a schematic view showing the connection and flow of the main body of an engine-driven air source heat pump unit according to a third embodiment of the present invention;

FIG. 5 is a schematic view showing the connection and flow of the main body of an engine-driven air source heat pump unit according to a fourth embodiment of the present invention;

FIG. 6 is a schematic view showing the connection and flow of the main body of an engine-driven air source heat pump unit according to a fifth embodiment of the present invention;

FIG. 7 is a schematic view showing the connection and flow of the main body of an engine-driven air source heat pump unit according to a sixth embodiment of the present invention;

FIG. 8 is a schematic view illustrating the connection and flow of the peripheral parts of an engine-driven air source heat pump unit according to a seventh embodiment of the present invention; and

fig. 9 is a schematic connection and flow diagram of the peripheral parts of an engine-driven air source heat pump unit according to a seventh embodiment of the present invention.

Description of the figure numbering: the system comprises a flue gas cooling water heat exchanger 8, an engine 10, a transmission device 11, a compressor 12, an air inlet 13, an air outlet 14, a first heat exchanger 15, a first throttle valve 16, a flue gas refrigerant heat exchanger 17, a first pipeline 18, a first connection point 19, a second connection point 20, a second throttle valve 21, a second heat exchanger 22, a first circulation port 23, a second circulation port 24, a first switching valve 25, a second switching valve 26, a third switching valve 27, a smoke exhaust pipeline 28, an oil separator 30, a lubricating oil circuit 31, a drying filter 32, a first branch 34, a second branch 35, a refrigerant three-way valve 36, a fourth switching valve 38, a third heat exchanger 39, a fifth switching valve 40, a smoke exhaust port 130, a cooling water pump 138, an expansion water tank 139, a thermostat 140, a three-way catalyst 141, a drain valve 142, a cooling water three-way valve 143, a condensate port 144, a neutralization tank 145, a neutralization ball 146, a radiator 147, a cooling water refrigerant heat exchanger 149, a cooling water inlet a and a cooling water outlet b.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the effects of the present invention easy to understand, the following embodiments are specifically described with reference to the accompanying drawings.

< first embodiment >

The embodiment provides an engine driving air source heat pump unit. FIG. 1 is a schematic view illustrating the connection and flow of the main body of an engine-driven air source heat pump unit according to a first embodiment of the present invention; fig. 2 is a schematic connection and flow diagram of the peripheral parts of an engine-driven air source heat pump unit according to a first embodiment of the present invention.

As shown in fig. 1 and 2, the engine-driven air source heat pump unit includes a main body portion and a peripheral portion. The main body part comprises an engine 10, a transmission device 11, a compressor 12, a first heat exchanger 15, a first throttle valve 16, a flue gas refrigerant heat exchanger 17, a first pipeline 18, a second throttle valve 21, a second heat exchanger 22, a refrigerant three-way valve 36 and a cooling water refrigerant heat exchanger 149. The peripheral part comprises a flue gas cooling water heat exchanger 8, a cooling water pump 138, a thermostat 140, a three-way catalyst 141, a cooling water three-way valve 143 and a radiator 147.

As shown in fig. 1, an output end of an engine 10 is connected to a compressor 12 through a transmission 11, and the compressor 12 is driven to compress refrigerant gas therein. The rotation speed of the engine 10 is continuously adjustable, and the rotation speed of the compressor 12 is adjusted according to the requirements under different operation conditions by adjusting the rotation speed of the engine 10. The engine 10 also has a smoke exhaust duct 28 capable of exhausting smoke generated during operation of the engine 10.

The engine 10 is one of naturally aspirated or turbocharged form, and the transmission 11 is any one of a coupling, an electromagnetic clutch, a change speed gearbox or a belt with pulleys.

The compressor 12 has a suction port 13 and a discharge port 14, and refrigerant gas enters through the suction port 13, is compressed, and is discharged through the discharge port 14. The compressor 12 is any one of an open screw compressor, an open magnetic suspension centrifugal compressor or an open scroll compressor, and the refrigerant in the compressor 12 is any one of propane, NH3, R718, HFC32, HFC134a, HFC407C, HFC410a, HFC245fa, HFC507A, HFO1234ze, HFO1234yf or HFO1234 zf.

The first heat exchanger 15 is for supplying heat, and has a first refrigerant inlet and a first refrigerant outlet, the first refrigerant inlet communicating with the discharge port 14. The heat supply mode of the first heat exchanger 15 is hot water heat supply or hot air heat supply.

The flue gas refrigerant heat exchanger 17 is disposed within the exhaust flue 28 and the refrigerant absorbs heat from the flue gas within the exhaust flue 28 of the engine 10 for evaporation. The refrigerant in the cooling water refrigerant heat exchanger 149 absorbs heat from the cooling water to evaporate. The cooling water is water or antifreeze. The cooling water refrigerant heat exchanger 149 is in series or parallel with the refrigerant side of the flue gas refrigerant heat exchanger 17. In the present embodiment, the cooling water refrigerant heat exchanger 149 is connected in series with the refrigerant side of the flue gas refrigerant heat exchanger 17, and the cooling water is antifreeze. The cooling water refrigerant heat exchanger 149 has a cooling water inlet a and a cooling water outlet b.

The flue gas refrigerant heat exchanger 17 has a second refrigerant inlet and a second refrigerant outlet, the second refrigerant inlet is connected to the first refrigerant outlet through the first throttle valve 16, and the second refrigerant outlet is connected in series with the refrigerant side of the cooling water refrigerant heat exchanger 149 and then communicated with the suction port 13. The first throttle valve 16 is an electronic expansion valve.

The first refrigerant outlet is connected to the second refrigerant inlet by a first line 18. The first conduit 18 has a first connection point 19 and a second connection point 20, the second connection point 20 being closer to the flue gas refrigerant heat exchanger 17 than the first connection point 19.

The second heat exchanger 22 has a first circulation port 23 and a second circulation port 24. The first communication port 23 is connected to the second connection point 20 via the second throttle valve 21, and is also connected to the first connection point 19 via the third switching valve 27. The second port 24 is connected to the E1 port of the refrigerant three-way valve 36, the S1 port of the refrigerant three-way valve 36 is connected to the suction port 13, and the discharge port 14 is connected to the D1 port of the refrigerant three-way valve 36. The second throttle 21 is an electronic expansion valve.

The refrigerant three-way valve 36 is any one of a solenoid valve, an electric butterfly valve, an electric ball valve, and an electric stop valve, and the refrigerant three-way valve 36 may be a single valve or a valve block. The refrigerant three-way valve 36 may also be configured to have the same function by 2 two-way valves. The third switching valve 27 is any one of a check valve, an electromagnetic valve, an electric ball valve, or an electric cut-off valve.

As shown in fig. 2, the flue gas discharged from the engine 10 sequentially enters the flue gas cooling water heat exchanger 8 and the flue gas refrigerant heat exchanger 17 in the smoke exhaust duct 28 through the three-way catalyst 141 to release heat to the cooling water and the refrigerant, the flue gas after heat release is discharged through the smoke exhaust port 130, and the water condensed from the flue gas enters the neutralization tank 145 through the water condensing port 144. The neutralizing tank 145 is filled with a neutralizing ball 146, the neutralizing ball 146 is a zeolite substance, the nitrogen-containing acidic substance in the condensed water is neutralized, and the neutralized condensed water is discharged through an overflow port of the neutralizing tank 145 or is discharged through a drain valve 142 during maintenance.

The first heat exchanger 15 and the radiator 147 are connected in series or in parallel. In this embodiment, the first heat exchanger 15 and the radiator 147 are connected in series, and the hot water or hot air enters the first heat exchanger 15 and the radiator 147 in sequence for heating.

The coolant three-way valve 143 has M, N, and P ports. The M port is connected to the thermostat 140, the N port is connected to the cooling water inlet a, and the P port is connected to the cooling water inlet of the radiator 147. The cooling water outlet b is connected between the P port and the cooling water inlet port of the radiator 147.

The cooling water is pressurized by the cooling water pump 138, flows through the flue gas cooling water heat exchanger 8, absorbs heat in the flue gas, flows through the cylinder liner of the engine 10, is heated, and enters the thermostat 140. When the temperature of the cooling water entering the thermostat 140 is low, the cooling water directly flows back to the cooling water pump 138; when the temperature of the cooling water entering the thermostat 140 is high, the cooling water flows entirely or partially through the cooling water three-way valve 143. The cooling water leaving the cooling water three-way valve 143 flows through the radiator 147 in the heating mode or the cooling and heating mode and then flows back to the cooling water pump 138; if the heat exchange amount of the flue gas refrigerant heat exchanger 17 is not enough to share the frost-free requirement of the second heat exchanger 22 during the heating mode, the ports P and N are simultaneously circulated, the cooling water refrigerant heat exchanger 149 exchanges heat to ensure the frost-free operation of the second heat exchanger 22, the cooling water flows through the radiator 147 and then flows back to the cooling water pump 138, and flows through the cooling water refrigerant heat exchanger 149 and the radiator 147 and then flows back to the cooling water pump during the defrosting mode. An expansion water tank 139 is arranged on an inlet pipeline of the cooling water pump 138, and the expansion water tank 139 is used for adding cooling water and keeping the pressure of an inlet of the cooling water pump 138 constant.

The engine-driven air source heat pump unit provided by the embodiment has a heating mode and a defrosting mode, and the specific working process is as follows:

as shown in fig. 1, in the heating mode, the port E1 and the port S1 of the refrigerant three-way valve 36 are communicated, the third switching valve 27 is closed, and the first throttle 16 and the second throttle 21 are normally adjusted. The engine 10 drives the compressor 12 through the transmission 11 to compress the refrigerant gas, the compressed refrigerant gas is discharged to the first refrigerant inlet and enters the first heat exchanger 15, and the refrigerant gas releases heat and condenses in the first heat exchanger 15 to become refrigerant liquid. The refrigerant liquid discharged from the first refrigerant outlet of the first heat exchanger 15 passes through the first line 18, the first connection point 19, is split into two paths at the second connection point 20, and enters the first branch path 34 and the second branch path 35. The refrigerant in the second branch 35 is converted into a gas-liquid two-phase refrigerant by the first throttle valve 16, then enters the flue gas refrigerant heat exchanger 17 to absorb heat and evaporate, and then flows through the cooling water refrigerant heat exchanger 149. If the cooling water in the cooling water refrigerant heat exchanger 149 flows, the refrigerant absorbs the heat of the cooling water and continues to evaporate, so that the heat exchange amount of the second heat exchanger 22 is reduced, and the air blown through the second heat exchanger 22 operates above the dew point temperature, thereby realizing heating frost-free operation; if the cooling water in the cooling water refrigerant heat exchanger 149 does not flow, the refrigerant gas does not exchange heat when flowing through the cooling water refrigerant heat exchanger 149. After the refrigerant liquid in the first branch 34 is converted into a gas-liquid two-phase refrigerant through the second throttle valve 21, the refrigerant liquid enters the second heat exchanger 22 through the first circulation port 23 to absorb heat and evaporate to be converted into refrigerant gas, and then the refrigerant gas passes through the three-way valve E1 port and the three-way valve S1 port, and the two paths are converged and then return to the compressor 12 through the suction port 13.

In the defrosting mode, the ports D1 and E1 of the refrigerant three-way valve 36 are communicated, the third switching valve 27 is opened, the first throttle valve 16 is normally adjusted, and the second throttle valve 21 is closed. The engine 10 drives the compressor 12 through the transmission device 11 to compress the refrigerant gas and then divides the refrigerant gas into two paths, one path enters the first heat exchanger 15 through the first refrigerant inlet, the refrigerant gas releases heat in the first heat exchanger 15 and is condensed into refrigerant liquid, and the refrigerant liquid is discharged from the first refrigerant outlet; after the other path of refrigerant gas flows into the second heat exchanger 22 through the ports D1 and E1 of the refrigerant three-way valve 36 and the second circulation port 24, the refrigerant gas is condensed into refrigerant liquid, so that heat is released to frost on the surface of the second heat exchanger 22 to defrost, then the refrigerant liquid flows out from the first circulation port 23, passes through the third switching valve 27, is converged in two paths of refrigerant liquid at the first connection point 19, flows into the second branch 35, is converted into gas-liquid two-phase refrigerant through the first throttle valve 16, then enters the flue gas refrigerant heat exchanger 17 to absorb heat and evaporate, and is converted into refrigerant gas after absorbing heat and evaporating in the cooling water refrigerant heat exchanger 149, and then returns to the compressor 12 through the air suction port 13.

Effects and effects of embodiment one

According to the engine-driven air source heat pump unit (hereinafter referred to as unit) of the embodiment, the engine, the compressor, the first heat exchanger, the second heat exchanger, the flue gas refrigerant heat exchanger, the cooling water refrigerant heat exchanger are provided, and the three-way valve enables the air suction port of the second heat exchanger and the air suction port of the compressor to be communicated in the heating mode and enables the air exhaust port of the second heat exchanger and the air exhaust port of the compressor to be communicated in the defrosting mode. In the heating mode, after refrigerant gas discharged from the compressor releases heat and is condensed in the first heat exchanger, the refrigerant enters the second heat exchanger and the flue gas refrigerant heat exchanger (and the cooling water refrigerant heat exchanger) to absorb heat and evaporate. In the defrosting mode, refrigerant gas discharged from the compressor is divided into two paths, one path of the refrigerant gas flows to the first heat exchanger for heat release and condensation, the other path of the refrigerant gas flows to the second heat exchanger for heat release and condensation, and the two paths of the refrigerant gas are converged to enter the flue gas refrigerant heat exchanger and the cooling water refrigerant heat exchanger for heat absorption and then return to the compressor. The first heat exchanger is used as a condenser to stably supply heat in a sufficient amount all the time in the heating and defrosting modes, and the problem that the heat supply of a unit is unstable or the heat supply cannot be carried out in the defrosting mode is solved. Meanwhile, the system of the unit is not stopped when the heating mode and the defrosting mode are switched, and defrosting is synchronously realized only by accelerating the speed of the engine, so that the heat supply stability of the unit is further ensured.

The refrigerant three-way valve is arranged between the suction ports of the second heat exchanger and the compressor and between the exhaust ports of the second heat exchanger and the compressor, the third switching valve is arranged between the second heat exchanger and the flue gas refrigerant heat exchanger, and the unit mainly switches control modes through the three-way valve, so that equipment pipelines are simpler, the refrigerant gas resistance is reduced, the unit cost is reduced, and the working efficiency of the unit is improved.

In the heating mode, the flue gas refrigerant heat exchanger can fully recover low-grade waste heat in the flue gas, and the cooling water refrigerant heat exchanger is used as an evaporator if necessary, so that the load of the second heat exchanger is shared, and the problem of unit frosting is alleviated and even avoided.

In conclusion, the engine-driven air source heat pump unit has the advantages of simple equipment pipeline, high working efficiency and stable heat supply, can realize frost-free operation or defrosting of the equipment while supplying heat, saves energy consumption, reduces cost and prolongs the service life of the equipment.

< example two >

Fig. 3 is a schematic connection and flow diagram of a main body of an engine-driven air source heat pump unit according to a second embodiment of the present invention.

As shown in fig. 3, the second embodiment provides an engine-driven air source heat pump unit, which is different from the first embodiment in that the main body of the engine-driven air source heat pump unit in the present embodiment further includes an oil separator 30, a lubricating oil circuit 31, and a dry filter 32. The first heat exchanger 15 of the present embodiment does not include the oil separator 30.

Other structures in this embodiment are the same as those in the first embodiment, and the same structures are given the same reference numerals.

In fig. 3, the oil separator 30 has an oil refrigerant inlet, an oil refrigerant outlet, and a lubricating oil discharge port, the oil refrigerant inlet communicates with the exhaust port 14, the oil refrigerant outlet communicates with the first refrigerant inlet, and the lubricating oil circuit 31 communicates the lubricating oil discharge port with the compressor 12.

The refrigerant gas containing the lubricating oil enters the oil separator 30 through the oil-separated refrigerant inlet, the refrigerant gas from which the lubricating oil has been separated is discharged from the oil-separated refrigerant outlet, and the separated lubricating oil returns to the compressor 12 through the lubricating oil circuit 31.

The dry filter 32 is disposed between the first connection point 19 and the second connection point 20, and dry filters the refrigerant flowing therethrough.

The working process of the second embodiment is basically the same as that of the first embodiment, except that:

as shown in fig. 3, in both the heating mode and the defrosting mode, the refrigerant gas discharged from the exhaust port 14 of the compressor 12 needs to enter the oil separator 30 through the oil-separated refrigerant inlet, the oil separator 30 separates the lubricating oil in the refrigerant gas, and the separated lubricating oil returns to the compressor 12 through the lubricating oil circuit 31.

In both the heating mode and the defrosting mode, the refrigerant liquid must be dried by the dry filter 32. The heating mode enters the flue gas refrigerant heat exchanger 17 and the cooling water refrigerant heat exchanger 149 through the first throttling valve 16 and enters the second heat exchanger 22 through the second throttling valve 21; the defrost mode is passed through the first throttle valve 16 into the flue gas refrigerant heat exchanger 17 and the cooling water refrigerant heat exchanger 149.

Effects and effects of example two

The engine-driven air source heat pump unit (hereinafter referred to as unit) provided in this embodiment has the same functions and effects as the unit provided in the first embodiment, and is not described herein again.

The unit provided by the embodiment is provided with the oil separator and the lubricating oil loop, can separate the lubricating oil in the refrigerant gas, and can feed the lubricating oil back to the compressor for recycling, so that the cost is reduced, and the service life of the compressor is prolonged; the unit provided by the embodiment also comprises a drying filter, so that redundant moisture and impurities in the refrigerant can be removed, and the overall working efficiency and reliability of the unit are improved.

< example III >

Fig. 4 is a schematic connection and flow diagram of a main body of an engine-driven air source heat pump unit according to a third embodiment of the present invention.

As shown in fig. 4, the third embodiment provides an engine-driven air source heat pump unit, which is different from the first embodiment in that the main body of the engine-driven air source heat pump unit in the present embodiment further includes a fourth switching valve 38, a third heat exchanger 39, and a fifth switching valve 40.

Other structures in this embodiment are the same as those in the first embodiment, and the same reference numerals are given to the same structures.

In fig. 4, the first communication port 23 is connected to the second connection point 20 via the fourth switching valve 38 and the second throttle 21, and the fourth switching valve 38 is located closer to the first communication port 23 than the second throttle 21. The first circulation port 23 is also connected to the first connection point 19 via a fourth switching valve 38 and a third switching valve 27 connected in series.

The third heat exchanger 39 has a third refrigerant inlet and a third refrigerant outlet. The third refrigerant inlet is connected to the fifth switching valve 40, and then connected in parallel to the second heat exchanger 22 and the fourth switching valve 38, one end of the parallel connection is connected to the third switching valve 27 and the second throttle valve 21, respectively, and the other end of the parallel connection is connected to the E1 port of the refrigerant three-way valve 36, respectively. The fourth switching valve 38 and the fifth switching valve 40 are each any one of an electromagnetic valve, an electric ball valve, and an electric shutoff valve.

The working process of the third embodiment is basically the same as that of the first embodiment, except that:

the working process of the third embodiment further comprises a cooling and heating mode. In the heating mode and the defrosting mode, the fourth switching valve 38 is opened, the fifth switching valve 40 is closed, and the third heat exchanger 39 is not operated.

In the cooling and heating mode, the heat supply amount of the first heat exchanger 15 is Qc, the input work of the compressor is W, and the cooling amount of the third heat exchanger is Qe. The refrigeration and heating modes are as follows:

if Qc-Qe-W >0, the first throttle valve 16 is opened, the fourth switching valve 38 is closed, and the heat of Qc-Qe-W is rejected to the flue gas refrigerant heat exchanger 17. At this time, the E1 port and the S1 port of the refrigerant three-way valve 36 are communicated, the fifth switching valve 40 is opened, the third switching valve 27 is closed, and both the first throttle 16 and the second throttle 21 are normally adjusted. The gas engine 10 drives the compressor 12 through the transmission device 11 to compress refrigerant gas and then enters the first heat exchanger 15, the first heat exchanger 15 condenses the built-in refrigerant gas into refrigerant liquid to release heat, the refrigerant liquid is discharged from a first refrigerant outlet and then is divided into two paths, one path of the refrigerant liquid is converted into gas-liquid two-phase refrigerant through the first throttle valve 16 and then enters the flue gas heat exchanger to absorb heat and is converted into refrigerant gas, the other path of the refrigerant liquid is converted into gas-liquid two-phase refrigerant through the second throttle valve 21 and then enters the third heat exchanger 39 through the fifth switching valve 40 to absorb heat and refrigerate and is converted into refrigerant gas, the two paths are converged through the refrigerant three-way valve 36, and the refrigerant gas is conveyed back to the compressor 12 from the air suction port 13. The maximum heat exchange capacity of the flue gas refrigerant heat exchanger 17 in this operating state is Qy.

If Qc-Qe-W-Qy >0, the fourth switching valve 38 is opened and the opening of the fourth switching valve 38 is adjusted to ensure that excess heat is vented to atmosphere through the second heat exchanger 22.

Action and Effect of example III

The engine-driven air source heat pump unit (hereinafter referred to as unit) provided in this embodiment has the same functions and effects as the unit provided in the first embodiment, and will not be described herein again.

The unit that this embodiment provided does not shut down when switching heating, defrosting mode or refrigeration mode of heating, through synchronous refrigeration when the engine acceleration rate heats, has further guaranteed the stability of unit heat supply, is applicable to the occasion that has cold and hot demand simultaneously, makes the function of unit more extensive.

< example four >

Fig. 5 is a schematic connection and flow diagram of a main body of an engine-driven air source heat pump unit according to a fourth embodiment of the present invention.

As shown in fig. 5, the fourth embodiment provides an engine-driven air source heat pump unit, which is different from the third embodiment in that the main body of the engine-driven air source heat pump unit in the present embodiment further includes an oil separator 30, a lubricating oil circuit 31, and a dry filter 32. The first heat exchanger 15 of the present embodiment does not include the oil separator 30.

The other structures in this embodiment are the same as those in the embodiment, and the same reference numerals are given to the same structures.

In fig. 5, the oil separator 30 has an oil refrigerant inlet, an oil refrigerant outlet, and a lubricating oil discharge port, the oil refrigerant inlet communicates with the exhaust port 14, the oil refrigerant outlet communicates with the first refrigerant inlet, and the lubricating oil circuit 31 communicates the lubricating oil discharge port with the compressor 12.

The working process of the fourth embodiment is basically the same as that of the third embodiment, except that:

as shown in fig. 5, in both the heating mode and the defrosting mode, the refrigerant gas discharged from the exhaust port 14 of the compressor 12 needs to enter the oil separator 30 through the oil-separated refrigerant inlet, the oil separator 30 separates the lubricating oil in the refrigerant gas, and the separated lubricating oil returns to the compressor 12 through the lubricating oil circuit 31.

In the heating mode, the cooling and heating mode, or the defrosting mode, the refrigerant liquid is dried by the drying filter 32.

Effects and effects of example four

The engine-driven air source heat pump unit (hereinafter referred to as unit) provided in this embodiment has the same functions and effects as the unit provided in the third embodiment, and is not described herein again.

< example five >

Fig. 6 is a schematic connection and flow diagram of a main body of an engine-driven air source heat pump unit according to a fifth embodiment of the present invention.

As shown in fig. 6, the present embodiment provides an engine-driven air source heat pump unit, which includes a main body portion and a peripheral portion. The main body part comprises an engine 10, a transmission device 11, a compressor 12, a first heat exchanger 15, a first throttle valve 16, a flue gas refrigerant heat exchanger 17, a first pipeline 18, a second heat exchanger 22, a first switching valve 25, a second switching valve 26, a drying filter 32, a refrigerant three-way valve 36 and a cooling water refrigerant heat exchanger 149. The structure of the peripheral portion is completely the same as that in embodiment 1, and is not described again.

The output end of the engine 10 is connected to a compressor 12 through a transmission 11, and drives the compressor 12 to compress refrigerant gas therein. The rotation speed of the engine 10 is continuously adjustable, and the rotation speed of the compressor 12 is adjusted according to the requirements under different operation conditions by adjusting the rotation speed of the engine 10. The engine 10 also has a smoke exhaust duct 28 capable of exhausting smoke generated during operation of the engine 10.

The engine 10 is one of a naturally aspirated or turbocharged form, and the transmission 11 is any one of a coupling, an electromagnetic clutch, a change-speed gear box, or a belt with pulleys.

The compressor 12 has a suction port 13 and a discharge port 14, and refrigerant gas enters from the suction port 13, is compressed, and is discharged from the discharge port 14. The compressor 12 is any one of an open-type screw compressor, an open-type magnetic suspension centrifugal compressor or an open-type scroll compressor, and the refrigerant in the compressor 12 is any one of propane, NH3, R718, HFC32, HFC134a, HFC407C, HFC410a, HFC245fa, HFC507A, HFO1234ze, HFO1234yf or HFO1234 zf.

The flue gas refrigerant heat exchanger 17 is disposed within the exhaust flue 28 and the refrigerant absorbs heat from the flue gas within the exhaust flue 28 of the engine 10 for evaporation. The refrigerant in the cooling water refrigerant heat exchanger 149 absorbs heat from the cooling water to evaporate. The cooling water is water or antifreeze. The cooling water refrigerant heat exchanger 149 is in series or parallel with the refrigerant side of the flue gas refrigerant heat exchanger 17. In the present embodiment, the cooling water refrigerant heat exchanger 149 is connected in series with the refrigerant side of the flue gas refrigerant heat exchanger 17, and the cooling water is an antifreeze.

The flue gas refrigerant heat exchanger 17 has a second refrigerant inlet and a second refrigerant outlet, and the second refrigerant inlet is connected to the S1 port of the refrigerant three-way valve 36 and the second switching valve 26, respectively. The second refrigerant outlet is connected in series with the refrigerant side of the cooling water refrigerant heat exchanger 149 and then communicates with the suction port 13. The first throttle valve 16 is an electronic expansion valve.

The first refrigerant outlet is connected to the second refrigerant inlet by a first line 18. The first conduit 18 has a first connection point 19 and a second connection point 20, the second connection point 20 being closer to the flue gas refrigerant heat exchanger 17 than the first connection point 19. A dry filter 32 and a first throttle 16 are also connected between the first connection point 19 and the second connection point 20, and the dry filter 32 is closer to the first connection point 19 than the first throttle 16. The dry filter 32 is used to dry-filter the refrigerant flowing therethrough.

The second heat exchanger 22 has a first circulation port 23 and a second circulation port 24. The first flow port 23 is connected to the second connection point 20 via a first switching valve 25, and is also connected to the first connection point 19 via a third switching valve 27. The second flow port 24 is connected to the suction port 13 via the flue gas refrigerant heat exchanger 17 and the cooling water refrigerant heat exchanger 149 via the S1 port of the refrigerant three-way valve 36, and is also connected to the discharge port 14 via the D1 port of the refrigerant three-way valve 36.

The refrigerant three-way valve 36 is any one of a solenoid valve, an electric butterfly valve, an electric ball valve, and an electric stop valve, and the refrigerant three-way valve 36 may be a single valve or a valve block. The refrigerant three-way valve 36 may also be configured to have the same function by 2 two-way valves. The first switching valve 25 and the third switching valve 27 are any one of a check valve, an electromagnetic valve, an electric ball valve, and an electric shutoff valve. The second switching valve 26 is any one of a solenoid valve, an electric ball valve, or an electric shutoff valve.

as shown in fig. 6, in the heating mode, the E1 port and the S1 port of the refrigerant three-way valve 36 communicate with each other, the first switching valve 25 is opened, the second switching valve 26 and the third switching valve 27 are closed, and the first throttle 16 is normally adjusted. The engine 10 drives the compressor 12 through the transmission device 11 to compress the refrigerant gas, the compressed refrigerant gas is discharged to the first refrigerant inlet and enters the first heat exchanger 15, and the refrigerant gas releases heat and condenses in the first heat exchanger 15 to become refrigerant liquid. The refrigerant liquid discharged from the first refrigerant outlet of the first heat exchanger 15 is converted into a gas-liquid two-phase refrigerant by the first pipeline 18, the first connection point 19, the drying filter 32, and the first throttle valve 16, and then enters the second heat exchanger 22 through the second connection point 20, the first switching valve 25, and the first circulation port 23 to absorb heat in the air and evaporate, and then flows through the E1 port of the three-way valve 36, enters the flue gas refrigerant heat exchanger 17 through the S1 port and the second refrigerant inlet to absorb heat and evaporate, and then flows through the cooling water refrigerant heat exchanger 149. If the cooling water in the cooling water refrigerant heat exchanger 149 flows, the refrigerant absorbs the heat of the cooling water and continues to evaporate, so that the heat exchange amount of the second heat exchanger 22 is reduced, and the air blown through the second heat exchanger 22 operates above the dew point temperature, thereby realizing heating frost-free operation; if the cooling water in the cooling water refrigerant heat exchanger 149 does not flow, the refrigerant gas does not exchange heat when flowing through the cooling water refrigerant heat exchanger 149. The refrigerant gas flows through the second refrigerant outlet and returns to the compressor 12 through the suction port 13.

In the defrosting mode, the ports D1 and E1 of the refrigerant three-way valve 36 communicate with each other, the second switching valve 26 and the third switching valve 27 are opened, the first switching valve 25 is closed, and the first throttle valve 16 is normally adjusted. The engine 10 drives the compressor 12 through the transmission device 11 to compress the refrigerant gas and then divides the refrigerant gas into two paths, one path enters the first heat exchanger 15 through the first refrigerant inlet, the refrigerant gas releases heat in the first heat exchanger 15 and is condensed into refrigerant liquid, and the refrigerant liquid is discharged from the first refrigerant outlet; the other path of refrigerant gas flows into the second heat exchanger 22 through the ports D1 and E1 of the refrigerant three-way valve 36 and the second circulation port 24, the refrigerant gas is condensed into refrigerant liquid, heat is released to frost on the surface of the second heat exchanger 22 to defrost, then the refrigerant liquid flows out from the first circulation port 23, passes through the third switching valve 27, is converged in two paths of refrigerant liquid at the first connection point 19, the converged refrigerant liquid is converted into gas-liquid two-phase refrigerant through the first throttle valve 16, then enters the flue gas refrigerant heat exchanger 17 and the cooling water refrigerant heat exchanger 149 through the second switching valve 26 and the second refrigerant inlet to absorb heat and evaporate, is converted into refrigerant gas, and returns to the compressor 12 through the air suction port 13.

Effects and effects of example five

The engine-driven air source heat pump unit (hereinafter referred to as unit) according to the present embodiment is the same as the first embodiment, and will not be described herein again.

< example six >

Fig. 7 is a schematic connection and flow diagram of a main body of an engine-driven air source heat pump unit according to a sixth embodiment of the present invention.

As shown in fig. 7, the sixth embodiment provides an engine-driven air source heat pump unit, which is different from the fifth embodiment in that: in the present embodiment, the second switching valve 26 is not provided and the S1 port of the refrigerant three-way valve 36 is directly connected to the suction port 13.

The operation is only different from that of the fifth embodiment in that:

in the heating mode, the refrigerant gas-liquid two-phase flow passing through the first throttle valve 16 is divided into two paths. One path passes through the first switching valve 25 and the first circulation port 23, and after heat in the air is absorbed and evaporated by the second heat exchanger 22, the other path passes through the second circulation port 24 and ports E1 and S1 of the refrigerant three-way valve 36; the other path passes through a second refrigerant inlet and is evaporated in the flue gas refrigerant heat exchanger 17 and flows through the cooling water refrigerant heat exchanger 149. The two paths of refrigerant gas are converged and then flow back to the suction port 13.

The workflow, action and effect not mentioned in this embodiment are the same as those in the fifth embodiment.

< example seven >

Fig. 8 is a schematic connection and flow diagram of the peripheral parts of an engine-driven air source heat pump unit according to a seventh embodiment of the present invention.

As shown in fig. 8, the seventh embodiment provides an engine-driven air source heat pump unit, which is different from the first embodiment only in that: in the structure of the peripheral portion, the first heat exchanger 15 and the radiator 147 are connected in parallel. Other structures are completely the same as those of the first embodiment, and are not described herein again.

As shown in fig. 8, in this embodiment, hot water or hot air enters the first heat exchanger 15 and the radiator 147 for heating, and then converges and flows out. In the defrost mode, the cooling water exiting the cooling water refrigerant heat exchanger 149 is again passed through the radiator 147 to keep the temperature of the cooling water flowing back to the flue gas cooling water heat exchanger 8 stable so that a low temperature cooling water flowing to the thermostat 140 does not occur.

< example eight >

Fig. 9 is a schematic connection and flow diagram of the peripheral parts of an engine-driven air source heat pump unit according to an eighth embodiment of the present invention.

As shown in fig. 9, an eighth embodiment provides an engine-driven air source heat pump unit, which is different from the first embodiment only in that: the cooling water side of the cooling water refrigerant heat exchanger 149 is connected in a different manner, and the rest of the structure is identical to that of the first embodiment.

In the present embodiment, the cooling water inlet a on the cooling water side of the cooling water refrigerant heat exchanger 149 is connected to the N port of the cooling water three-way valve 143, and the cooling water outlet b is connected between the cooling water outlet of the radiator 147 and the cooling water pump 138.

The operation process is different from that of the first embodiment in that: the cooling water leaving the cooling water three-way valve 143 flows through the cooling water refrigerant heat exchanger 149 during the defrost mode and then directly back to the cooling water pump.

The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications are within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. An engine-driven air source heat pump unit is used for producing hot water or hot air and comprises an engine, a transmission device, a compressor, a first heat exchanger and a second heat exchanger, wherein the compressor is provided with an air exhaust port and an air suction port, the first heat exchanger is provided with a first refrigerant inlet and a first refrigerant outlet, the second heat exchanger is provided with a first circulation port and a second circulation port, and the engine-driven air source heat pump unit is characterized by further comprising:

a flue gas refrigerant heat exchanger, a cooling water refrigerant heat exchanger and a refrigerant three-way valve,

the refrigerant in the flue gas refrigerant heat exchanger absorbs heat from the flue gas in the exhaust duct of the engine and evaporates,

the refrigerant in the cooling water refrigerant heat exchanger absorbs heat from the cooling water to evaporate,

the refrigerant side of the cooling water refrigerant heat exchanger is in series or parallel with the refrigerant side of the flue gas refrigerant heat exchanger,

the second flow port is connected to the discharge port and the suction port through the three-way valve,

the first heat exchanger is used for supplying heat, and the first refrigerant inlet is communicated with the exhaust port; the flue gas refrigerant heat exchanger has a second refrigerant inlet and a second refrigerant outlet; the first refrigerant outlet is connected to the second refrigerant inlet by a first line having a first connection point and a second connection point thereon, the second connection point being closer to the flue gas refrigerant heat exchanger than the first connection point; the first flow port is connected to the second connection point via a second throttle valve and to the first connection point via a third switching valve, the second flow port is connected to the El port of the refrigerant three-way valve, the Sl port of the refrigerant three-way valve is connected to the suction port, and the Dl port of the refrigerant three-way valve is connected to the discharge port,

the second connection point is divided into two paths, which are called as a first branch path and a second branch path, the refrigerant in the second branch path is converted into gas-liquid two-phase refrigerant through a first throttling valve, then enters the flue gas refrigerant heat exchanger to absorb heat and evaporate, and the refrigerant liquid in the first branch path is connected to a pipeline between the first circulation port and the third switching valve through the second throttling valve.

2. The engine-driven air source heat pump unit of claim 1, wherein:

the operation mode of the engine-driven air source heat pump unit comprises a heating mode and a defrosting mode:

in the heating mode, after the refrigerant from the exhaust port releases heat and is condensed in the first heat exchanger, the refrigerant enters the second heat exchanger to absorb heat and evaporate, flows through the refrigerant three-way valve, and returns to the compressor from the suction port after the smoke refrigerant heat exchanger absorbs heat and evaporates;

in the defrosting mode, the refrigerant from the air outlet flows into the second heat exchanger through the refrigerant three-way valve to release heat and condense in the first heat exchanger, then enters the smoke refrigerant heat exchanger and the cooling water refrigerant heat exchanger to absorb heat and evaporate, and finally returns to the compressor through the air suction port.

3. The engine-driven air source heat pump unit according to claim 1 or 2, characterized in that:

in the heating mode, after the refrigerant from the exhaust port releases heat and condenses in the first heat exchanger, the refrigerant enters the second heat exchanger to absorb heat and evaporate, then flows through the refrigerant three-way valve, absorbs heat and evaporates in the flue gas refrigerant heat exchanger and the cooling water refrigerant heat exchanger, and then returns to the compressor from the suction port.

4. The engine-driven air source heat pump unit of claim 1, wherein:

and a first throttling valve is arranged between the first refrigerant outlet and the flue gas refrigerant heat exchanger.

5. The engine-driven air source heat pump unit of claim 1, further comprising:

a flue gas cooling water heat exchanger, a cooling water pump, a thermostat, a cooling water three-way valve and a radiator,

wherein the smoke of the engine sequentially enters the smoke cooling water heat exchanger and the smoke refrigerant heat exchanger so as to respectively release heat to the cooling water and the refrigerant,

the first heat exchanger and the radiator are connected in series or in parallel, the hot water or hot air enters the first heat exchanger and the radiator in sequence or respectively for heating,

the cooling water is antifreeze or water.

6. The engine-driven air source heat pump unit of claim 5, wherein:

wherein the cooling water is pressurized by the cooling water pump, flows through the flue gas cooling water heat exchanger and the engine, is heated and heated, and then enters the thermostat,

when the temperature of the cooling water entering the thermostat is low, the cooling water directly flows back to the cooling water pump;

when the temperature of the cooling water entering the thermostat is high, the cooling water flows back to the cooling water pump after flowing through the cooling water three-way valve and the radiator.

7. The engine-driven air source heat pump unit according to claim 5 or 6, wherein:

in the defrosting mode, the cooling water is pressurized by the cooling water pump, flows through the flue gas cooling water heat exchanger and the engine for heating, enters the thermostat, flows through the cooling water three-way valve and the cooling water refrigerant heat exchanger, and then flows back to the cooling water pump.

8. The engine-driven air source heat pump unit according to claim 5 or 6, characterized in that:

in the heating mode or the defrosting mode, the cooling water is pressurized by the cooling water pump, flows through the flue gas cooling water heat exchanger and the engine for heating, enters the thermostat, flows through the cooling water three-way valve, the cooling water refrigerant heat exchanger and the radiator, and then flows back to the cooling water pump.

9. The engine-driven air source heat pump unit of claim 1, wherein:

the flue gas refrigerant heat exchanger is any one of a fin coil type heat exchanger, a plate-fin type heat exchanger, a plate-shell type heat exchanger and a sleeve type heat exchanger,

the cooling water refrigerant heat exchanger is any one of a fin coil type heat exchanger, a plate-fin type heat exchanger, a plate-shell type heat exchanger and a sleeve type heat exchanger.

10. The engine-driven air source heat pump unit of claim 1, wherein:

wherein, the material of flue gas refrigerant heat exchanger is stainless steel.