CN109000387A - Air-source with second vapor injection-water source combined heat-pump system - Google Patents

Abstract

The present invention provides a kind of air-source with second vapor injection-water source combined heat-pump system, including second vapor injection screw compressor, economizer, gas-liquid separator, domestic hot water side heat exchanger, water source side heat exchanger, finned tube exchanger and device for drying and filtering etc.；This system, which can be realized, independently carries out heating and refrigeration using air-source and water source two ways, and the highest operational mode of efficiency is automatically selected according to air themperature and water source temperature condition, when air-source progress heating operation is used alone, minimum environment temperature can reach -20 DEG C, can effectively solve air source heat pump and limit in the use of north cold area.

Description

Air source-water source composite heat pump system with intermediate air supply

technical field

The invention relates to a heat pump system, in particular to an air source-water source composite heat pump system with intermediate air supply.

Background technique

Heating is common in the cold regions of northern my country in winter, and most of them use coal-fired centralized heating. At the same time, there are a small number of scattered regional boiler rooms, electric heaters for personal use, and small coal-fired, oil-fired, and gas-fired boilers for winter heating, which wastes energy. What has brought about is the continuous aggravation of environmental pollution.

As an energy-saving and environment-friendly technology, the air source heat pump has good safety, and is easy to install and use, and has been widely used in the world. Due to the influence of outdoor ambient temperature, ordinary air source heat pump units cannot operate normally in an environment below minus 5°C, and face problems such as low heating efficiency and high exhaust temperature, which severely limits the use of air source heat pumps as an energy-saving technology in cold northern regions. usage of.

Another patent of the applicant (patent number: ZL 200920203070.1, patent name: low-temperature quasi-two-stage air source heat pump device) adopts an intermediate supplementary air scroll compressor and its improved system, which can operate in a low temperature environment above -20°C It operates stably and efficiently for a long time, and prepares hot water above 50°C, which meets the requirements of heating and sanitary hot water in winter in cold northern regions. The present invention further improves the above-mentioned patented technology, and provides a compound heat pump that can independently use air source and water source for heating and cooling, and automatically select the most efficient operation mode according to the air temperature and water source temperature conditions, further expanding The scope and flexibility of the use of air source heat pumps are improved.

Contents of the invention

In order to overcome the limited use of air source heat pumps in northern cold regions, the present invention provides an air source-water source composite heat pump system with intermediate air supply, which can realize heating and cooling by using air source and water source independently, And according to the air temperature and water source temperature, the most efficient operation mode is automatically selected, which can effectively solve the use restrictions of air source heat pumps in cold northern regions.

The technical solution adopted by the present invention to solve the technical problem is: an air source-water source composite heat pump system with intermediate air supply, including an intermediate air supply scroll compressor, an economizer, a gas-liquid separator, an air conditioner side heat exchanger, and a water source Side heat exchanger, finned tube heat exchanger, and dry filter; the exhaust port z of the middle air-enhancing scroll compressor is connected to the port a of the first four-way reversing valve, and the suction port x of the middle air-enhancing scroll compressor It is connected with the outlet of the gas-liquid separator, and the air supply port y of the intermediate air supply scroll compressor is connected with the i port of the economizer; the b port of the first four-way reversing valve is connected with the a port of the second four-way reversing valve, and the first Port c of the four-way reversing valve is connected to the inlet of the gas-liquid separator, port d of the first four-way reversing valve is connected to port m of the heat exchanger on the water source side; port b of the second four-way reversing valve is connected to the fin tube exchange The p port of the heat heater is connected, the d port of the second four-way reversing valve is connected with the e port of the heat exchanger on the air conditioner side, and the c port of the second four-way reversing valve is connected with the inlet of the gas-liquid separator;

The pipelines at the q port of the finned tube heat exchanger, the f port of the air-conditioning side heat exchanger and the n port of the water source side heat exchanger are two branches in parallel, and one of the two branches of each pipeline is connected to the storage tank in parallel. The inlet of the liquid tank, the branch of the q port of the finned tube heat exchanger is set with the fourth check valve, the branch of the air conditioner side heat exchanger f port is set with the fifth check valve, and the branch of the water source side heat exchanger n port A sixth one-way valve is set in the branch circuit;

The other branch of the two branches of each pipeline is connected to the outlet of the main electronic expansion valve in parallel, and the branch at the q port of the finned tube heat exchanger is provided with the first check valve and the first electromagnetic valve in series, and the air conditioner The branch at port f of side heat exchanger is provided with the second one-way valve and second solenoid valve in series, and the branch at port n of water source side heat exchanger is provided with the third one-way valve and third solenoid valve in series ;

The j port of the economizer is divided into two circuits, one is connected to the inlet of the main electronic expansion valve, and the other is connected to the k port of the economizer through the gas supply electronic expansion valve; the outlet of the liquid reservoir is connected to the inlet of the dry filter, and the dry filter The outlet is connected to the h port of the economizer.

Preferably, the air conditioner side heat exchanger and the water source side heat exchanger are brazed plate heat exchangers.

The beneficial effects of the present invention are:

1. In the present invention, an air conditioner side heat exchanger, a water source side heat exchanger, a finned tube heat exchanger and a four-way reversing valve are provided, and the four-way reversing valve and the electromagnetic valve can be used independently by turning on and off the power Air source and water source are used for heating and cooling.

2. The system adopts an economizer. On the one hand, it can reduce the specific enthalpy of the refrigerant entering the main electronic expansion valve, increase the subcooling degree of the refrigerant, improve the working conditions of the main electronic expansion valve, and increase the heat extracted by the system from low-temperature heat sources. In cooling mode, the cooling capacity can be increased; on the other hand, the refrigerant entering the intermediate air supply port y of the intermediate air supply scroll compressor is preheated to effectively prevent the refrigerant entering the intermediate air supply scroll compressor from containing liquid, preventing The wet compression of the compressor can effectively reduce the exhaust temperature of the scroll compressor with intermediate supplementary air, and increase the exhaust enthalpy, thereby increasing the heating capacity of the system.

3. The system adopts an intermediate air supply scroll compressor and a special refrigerant circuit, which can operate stably and efficiently for a long time in a low temperature environment above -20°C, meeting the winter heating and sanitary hot water requirements in cold northern regions.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

In Fig. 1, 1. Scroll compressor with air supply in the middle, 2. Gas-liquid separator, 3. Liquid receiver, 4. Finned tube heat exchanger, 5. Air-conditioning side heat exchanger, 6. Water source side heat exchange 7. Economizer, 8. The first four-way reversing valve, 9. The second four-way reversing valve, 10. Air supply electronic expansion valve, 11. Main electronic expansion valve, 12. The first solenoid valve, 13 .The second solenoid valve, 14. The third solenoid valve, 15. The first one-way valve, 16. The second one-way valve, 17. The third one-way valve, 18. The fourth one-way valve, 19. The fifth one-way valve Directional valve, 20. The sixth one-way valve, 21. Dry filter, 22. Air conditioning side circulating water pump, 23. Water source side circulating water pump.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

Embodiment one

As shown in Figure 1, the exhaust port z of the intermediate air-supplementing scroll compressor 1 is connected to the port 8a of the first four-way reversing valve, and the port 8b of the first four-way reversing valve is connected to the port 9a of the second four-way reversing valve , the first four-way reversing valve 8d port is connected to the m port of the water source side heat exchanger 6, the second four-way reversing valve 9d port is connected to the e port of the air conditioner side heat exchanger 5, and the second four-way reversing valve Port 9b is connected to port p of finned tube heat exchanger 4; port 8c of the first four-way reversing valve and port 9c of the second four-way reversing valve are connected in parallel to the inlet of gas-liquid separator 2, and gas-liquid separator 2 The outlet is connected to the suction port x of the intermediate air supply scroll compressor 1; the q port of the finned tube heat exchanger 4, the f port of the air conditioner side heat exchanger 5, and the n port side of the water source side heat exchanger 6 They are divided into two paths respectively, and one path is respectively connected to the fourth one-way valve 18, the fifth one-way valve 19, and the sixth one-way valve 20, and then connected in parallel to the inlet of the liquid receiver 3, and the refrigerant can only flow from the finned tube heat exchanger. The q port of 4, the f port of the air conditioner side heat exchanger 5, and the n port side of the water source side heat exchanger 6 flow to the inlet of the liquid reservoir 3; A first check valve 15, a second check valve 16, a third check valve 17, a first solenoid valve 12, a second solenoid valve 13, and a third solenoid valve 14 are respectively arranged on the pipeline at the outlet of the electronic expansion valve 11. The agent can only flow from the outlet of the main electronic expansion valve 11 to the q port of the finned tube heat exchanger 4, the f port of the air conditioner side heat exchanger 5, and the n port of the water source side heat exchanger 6; the j port of the economizer 7 is divided into Two routes, one route is directly connected to the inlet of the main electronic expansion valve 11, and the other route is connected to the port k of the economizer 7 through the gas supply electronic expansion valve 10; the port h of the economizer 7 is connected to the outlet of the dry filter 21, and the economizer The i port of 7 is connected to the air supply port y of the intermediate air supply scroll compressor 1; the outlet of the liquid accumulator 3 is connected to the inlet of the dry filter 21.

The electrical controller of the present invention can compare the current outdoor ambient temperature with the water source side temperature. In the heating mode, when the water source side temperature is greater than the outdoor ambient temperature minus the set deviation value, the water source heat pump heating mode is selected. When When the water source side temperature is lower than the outdoor ambient temperature minus the set deviation value or when the water source side temperature is lower than the set value, select the air source heat pump heating mode; in cooling mode, when the water source side temperature is greater than the outdoor ambient temperature minus the set value When the deviation value is selected, the air source heat pump cooling mode is selected. When the water source side temperature is lower than the outdoor ambient temperature minus the set deviation value, the water source heat pump cooling mode is selected. The set deviation value is different according to the design parameters of the finned tube heat exchanger and the brazed plate heat exchanger on the water source side. Usually, the value range is between 4 and 8 °C.

Embodiment two

As shown in Figure 1, in the heating mode of the air source heat pump, the first solenoid valve 12 is energized to open, the second solenoid valve 13 and the third solenoid valve 14 are not energized and closed, the second four-way reversing valve 9 is energized, and the middle The exhaust gas of the supplementary air scroll compressor 1 enters the a port of the first four-way reversing valve 8, discharges from the b port, enters the a port of the second four-way reversing valve 9, and then discharges from the d port, and enters the air conditioner side The heater 5, after exchanging heat with the circulating water system, enters the liquid reservoir 3 through the fifth one-way valve 19, and enters the h port of the economizer 7 through the dry filter 21 after coming out of the liquid reservoir 3, and flows from j Outflow from the port is divided into two paths, one path enters port k of the economizer 7 through the gas supply electronic expansion valve 10, and enters the gas supply port y of the intermediate gas supply scroll compressor 1 through port i after exchanging heat in the economizer, and the other path After throttling by the main electronic expansion valve 11, it enters the finned tube heat exchanger 4 through the first solenoid valve 12 and the first one-way valve 15. After absorbing the heat in the air in the finned tube heat exchanger 4, it enters the second The b port of the two-way and four-way reversing valve 9 flows out from the c port into the gas-liquid separator 2 for gas-liquid separation, and the gas returns to the suction port x of the middle gas-supplementing scroll compressor 1 .

In the cooling mode of the air source heat pump, the first solenoid valve 12 and the third solenoid valve 14 are not energized and closed, the second solenoid valve 13 is energized and opened, and the exhaust gas of the intermediate air-supplementing scroll compressor 1 enters the first four-way reversing valve Port a of 8, discharged from port b, enters port a of the second four-way reversing valve 9, then discharges from port b, enters finned tube heat exchanger 4, releases heat to the air, and passes through the fourth one-way The valve 18 enters the accumulator 3, comes out from the accumulator 3, passes through the dry filter 21, enters the h port of the economizer 7, and flows out from the j port after heat exchange. The k port of the economizer 7 enters the air supply port y of the intermediate supplementary air scroll compressor 1 through the i port after exchanging heat in the economizer 7, and the other way passes through the second solenoid valve 13 after throttling by the main electronic expansion valve 11 And the second one-way valve 16 enters the heat exchanger 5 on the air-conditioning side, and after exchanging heat with the circulating water system, it enters the d port of the second four-way reversing valve 9, and flows out from the c port into the gas-liquid separator 2 for gas-liquid separation Afterwards, the gas returns to the suction port x of the scroll compressor 1 with intermediate supplementary gas.

Embodiment three

As shown in Figure 1, in the heating mode of the water source heat pump, the first solenoid valve 12 and the second solenoid valve 13 are not powered and closed, the third solenoid valve 14 is opened, the second four-way reversing valve 9 is powered, and the air is supplied in the middle The exhaust gas from the scroll compressor 1 enters the a port of the first four-way reversing valve 8, is discharged from the b port, enters the a port of the second four-way reversing valve 9, and then is discharged from the d port, and enters the air conditioner side heat exchanger 5. After exchanging heat with the water system, it enters the liquid reservoir 3 through the fifth one-way valve 19, comes out of the liquid reservoir 3, passes through the dry filter 21 and enters the h port of the economizer 7, and flows out from the j port after heat exchange. Divided into two routes, one route enters port k of the economizer 7 through the gas supply electronic expansion valve 10, and enters the gas supplement port y of the intermediate supplementary gas scroll compressor 1 through the i port after exchanging heat in the economizer 7, and the other route passes through the main After throttling by the electronic expansion valve 11, it enters the water source side heat exchanger 6 through the third solenoid valve 14 and the third one-way valve 17, absorbs heat, enters the d port of the first four-way reversing valve 8, and flows out from the c port into the After the gas-liquid separator 2 separates the gas and liquid, it returns to the suction port x of the scroll compressor 1 with intermediate supplementary air.

In the cooling mode of water source heat pump operation, the second solenoid valve 13 is energized to open, the first solenoid valve 12 and the third solenoid valve 14 are not energized to close, the first four-way reversing valve 8 is energized, and the middle air supply scroll compressor 1 row The gas enters port a of the first four-way reversing valve 8, then is discharged from port d, enters the heat exchanger 6 on the water source side, and after releasing heat, enters the liquid reservoir 3 through the sixth one-way valve 20, and comes out of the liquid reservoir 3 After passing through the dry filter 21, it enters the h port of the economizer 7, and flows out from the j port after heat exchange, and is divided into two paths. After that, it enters the air supply port y of the intermediate air supply scroll compressor 1 through port i, and the other path passes through the main electronic expansion valve 11 and then enters the air conditioner side heat exchanger 5 through the second solenoid valve 13 and the second check valve 16 , after exchanging heat with the circulating water system, it enters the d port of the second four-way reversing valve 9, flows out from the c port into the gas-liquid separator 2 for gas-liquid separation, and returns to the suction of the intermediate air-supplementing scroll compressor 1 Breath x.

This system adopts the economizer 7, on the one hand, it can reduce the specific enthalpy of the refrigerant entering the main electronic expansion valve 11, increase the subcooling degree of the refrigerant, improve the working conditions of the main electronic expansion valve 11, and increase the heat extracted by the system from low-temperature heat sources , the cooling capacity can be increased in cooling mode; on the other hand, the refrigerant entering the intermediate air supply port y of the intermediate air supply scroll compressor 1 is preheated to effectively prevent the refrigerant from entering the intermediate air supply scroll compressor 1 Contains liquid to prevent wet compression of the compressor, while effectively reducing the exhaust temperature of the intermediate supplementary air scroll compressor 1, and increasing the exhaust enthalpy, thereby increasing the heating capacity of the system.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Any equivalent replacement or change of the inventive concepts thereof shall fall within the protection scope of the present invention.

Claims (2)

1. An air source-water source composite heat pump system with intermediate air supply, characterized in that it includes an intermediate air supply scroll compressor (1), an economizer (7), a gas-liquid separator (2), and an air conditioner side changer Heater (5), water source side heat exchanger (6), finned tube heat exchanger (4) and drier filter (21); described intermediate gas supply scroll compressor (1) exhaust port z and The first four-way reversing valve (8) is connected to the a port, the suction port x of the intermediate air supply scroll compressor (1) is connected to the outlet of the gas-liquid separator (2), and the intermediate air supply scroll compressor (1) The gas supply port y is connected to the i port of the economizer (7); the b port of the first four-way reversing valve (8) is connected to the a port of the second four-way reversing valve (9), and the first four-way reversing valve The c port of the direction valve (8) is connected with the inlet of the gas-liquid separator (2), and the d port of the first four-way reversing valve (8) is connected with the m port of the water source side heat exchanger (6); the second four-way The b port of the reversing valve (9) is connected to the p port of the finned tube heat exchanger (4), the d port of the second four-way reversing valve (9) is connected to the e port of the air conditioner side heat exchanger (5), and the Two or four-way reversing valve (9) c mouth links to each other with gas-liquid separator (2) inlet; The pipelines at the q port of the finned tube heat exchanger (4), the f port of the air conditioner side heat exchanger (5) and the n port of the water source side heat exchanger (6) are parallel as two branches, and the two branches of each pipeline One of the branches is connected to the inlet of the liquid reservoir (3) in parallel, and the branch of the finned tube heat exchanger (4) q port is provided with a fourth one-way valve (18), and the air conditioner side heat exchanger (5) f The fifth check valve (19) is set in the branch of the port, and the sixth check valve (20) is set in the branch of the n port of the water source side heat exchanger (6); The other branch of the two branches of each pipeline is connected to the outlet of the main electronic expansion valve (11) in parallel, and the branch at the q port of the finned tube heat exchanger (4) is provided with a serial first one-way valve ( 15), the first electromagnetic valve (12), the second check valve (16) and the second electromagnetic valve (13) in series are set in this branch of the air-conditioning side heat exchanger (5) f port, and the water source side heat exchange The branch of device (6) n port is provided with the third one-way valve (17) and the third solenoid valve (14) in series; The j port of the economizer (7) is divided into two paths, one path is connected to the inlet of the main electronic expansion valve (11), and the other path is connected to the k port of the economizer (7) through the gas supply electronic expansion valve (10) ; The outlet of the liquid reservoir (3) is connected to the inlet of the drier filter (21), and the outlet of the drier filter (21) is connected to the h port of the economizer (7). 2. The air source-water source composite heat pump system with intermediate air supply according to claim 1, characterized in that: the air conditioner side heat exchanger (5) and water source side heat exchanger (6) are brazed plate heat exchangers heater.