Frosting-free air source heat pump system and working process thereof

Abstract

The invention relates to the field of heat pumps, in particular to a frosting-free air source heat pump system and a working process thereof.The frosting-free air source heat pump system comprises a compressor, an economizer, a throttling valve, a radiator and an evaporator, and the two sides of the compressor are connected with one side of a condenser and one side of a gas-liquid separator correspondingly; the other side of the gas-liquid separator is connected with one side of the economizer, the other three sides of the condenser are connected with one side of the hot water circulating pump, one side of the water tank and one side of the liquid storage tank respectively, and the other three sides of the economizer are connected with the other side of the liquid storage tank, the evaporator and the radiator respectively. Through reasonable arrangement of the radiator and the evaporator, the problem that normal operation cannot be achieved due to the fact that air circulation is affected by frosting on the surface of the evaporator can be solved, the frosting period can be prolonged, even frosting can be avoided, and the heating efficiency in winter is effectively improved; high-temperature and high-pressure media directly enter the condenser for heat exchange, fluctuation of the temperature of a heat exchange medium outlet is reduced, and the efficient, stable and energy-saving using effect is achieved.

Description

Technical Field

[0001] The present invention relates to the field of heat pumps, in particular to a frost-free air source heat pump system and its working process. Background Art

[0002] Air-source heat pump technology is an energy-saving and environmentally friendly heating technology based on the reverse Carnot cycle, utilizing natural energy (such as air thermal storage) to generate a low-temperature heat source. The evaporator absorbs low-temperature heat from the outside air, causing the refrigerant to evaporate and absorb heat, thereby lowering the outside air temperature and turning the refrigerant into a low-temperature, low-pressure gas. The low-temperature, low-pressure refrigerant is then drawn into the compressor and compressed into a high-temperature, high-pressure gas. It then enters the condenser, where it exchanges heat with hot water, releasing high-temperature heat and raising the water temperature. During this process, the refrigerant transforms from a gas to a liquid, releasing a significant amount of heat. Finally, the high-temperature, high-pressure refrigerant is reduced in pressure and expanded by the expansion valve before returning to the evaporator, absorbing heat and evaporating, completing the cycle. This cycle repeats, continuously absorbing heat from the low-temperature source and transferring it to the water to be heated, reaching the desired temperature.

[0003] However, existing air source heat pump technology has the following defects: in winter, when the humidity is high, the evaporator surface of the air source heat pump system is prone to frost. Frost will hinder air circulation and reduce heat exchange efficiency, requiring irregular defrosting operations to restore its heating capacity. The traditional defrosting method generally adopts the reverse cycle defrosting method, that is, the four-way reversing valve performs reversing defrosting. The defrosting principle is to change the flow direction of the heat source medium through the four-way reversing valve. The heat generated by the compressor is all used for evaporator defrosting. It is necessary to reversely extract heat from the heated medium for circulation. The entire defrosting process not only fails to heat the heated medium, but also reversely extracts heat from the heated medium. This not only affects the continuous operation effect of the system, but also leads to low overall operation efficiency in winter. The time of ineffective work is twice the defrosting time. Summary of the Invention

[0004] To achieve the above objectives, the present invention aims to provide a frost-free air source heat pump system that can solve the problems existing in the background technology. The present invention provides the following technical solutions: A frost-free air-source heat pump system includes a compressor, an economizer, a throttle valve, a radiator, and an evaporator. Two sides of the compressor are connected to one side of the condenser and one side of the gas-liquid separator, respectively. The other side of the gas-liquid separator is connected to one side of the economizer. The remaining three sides of the condenser are connected to one side of a hot water circulation pump, a water tank, and one side of a liquid storage tank, respectively. The other side of the hot water circulation pump is connected to the water tank and the cold water inlet, respectively. The water tank is provided with a hot water outlet. The remaining three sides of the economizer are connected to the other side of the liquid storage tank, the evaporator, and the radiator, respectively. The evaporator and radiator are connected via a throttle valve. Compared to existing products, this product has been structurally improved, eliminating the four-way reversing valve and filter in the original system and adding an economizer and radiator.

[0005] As a further solution of the present invention: a fan is also installed next to the radiator to increase the working efficiency of the radiator.

[0006] As a further solution of the present invention, the fan adopts an axial flow fan, which is easily available in the market and has good use effect.

[0007] As a further solution of the present invention: a throttle is installed at the outlet of the compressor to control the flow and pressure of the compressor, thereby achieving pressure buffering of the fluid and reducing impact force.

[0008] As a further solution of the present invention, the throttle valve adopts an expansion valve, which has good throttling effect, low cost and is easy to replace.

[0009] As a further solution of the present invention: the compressor adopts a single-stage screw compressor, which has a simple structure, is easy to maintain, has good running stability and low running noise.

[0010] A working process of a frost-free air source heat pump system includes the following steps: When frost forms on the surface of the evaporator, the high-temperature and high-pressure medium of the compressor directly enters the condenser and heats the heat exchange medium in the condenser. The heat exchange medium flows through the liquid storage tank and enters the economizer, thereby exchanging heat with the return air of the compressor. The heat exchange medium in the economizer flows through the radiator and the throttle valve and then flows through the evaporator, thereby extracting heat energy from the air. After extracting the heat energy of the air, the heat exchange medium flows through the economizer, which can absorb waste heat and increase enthalpy, and finally returns to the compressor through the gas-liquid separator, which can be compressed and circulated to achieve the purpose of heating.

[0011] Compared with the prior art, the present invention has the following beneficial effects: This product solves the problem of frosting on the evaporator surface affecting air circulation and causing abnormal operation through the reasonable arrangement of the radiator and evaporator. It can extend the frosting cycle or even eliminate frosting, effectively improving the heating efficiency in winter. The high-temperature and high-pressure medium directly enters the condenser for heat exchange, reducing the fluctuation of the heat exchange medium outlet temperature, achieving efficient, stable and energy-saving use effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of an existing air source heat pump.

[0013] Figure 2 Schematic diagram of the structure of the frost-free air source heat pump system in an embodiment of the present invention.

[0014] In the figure: 1- compressor; 2- four-way reversing valve; 3- condenser; 4- liquid storage tank; 5- filter; 6- throttle valve; 7- evaporator; 8- fan; 9- gas-liquid separator; 10- hot water circulation pump; 11- cold water inlet; 12- water tank; 13- hot water outlet; 14- economizer; 15- radiator. DETAILED DESCRIPTION

[0015] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0016] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0017] Example 1 See Figure 1-2 A frost-free air source heat pump system includes a compressor 1, an economizer 14, a throttle valve 6, a radiator 15 and an evaporator 7. The two sides of the compressor 1 are respectively connected to one side of the condenser 3 and one side of the gas-liquid separator 9, and the other side of the gas-liquid separator 9 is connected to one side of the economizer 14. The remaining three sides of the condenser 3 are respectively connected to one side of the hot water circulation pump 10, the water tank 12 and one side of the liquid storage tank 4. The other side of the hot water circulation pump 10 is respectively connected to the water tank 12 and the cold water inlet 11. A hot water outlet 13 is provided on the water tank 12. The remaining three sides of the economizer 14 are respectively connected to the other side of the liquid storage tank 4, the evaporator 7 and the radiator 15. The evaporator 7 and the radiator 15 are connected through the throttle valve 6. Figure 1 This is a structural diagram of an existing air source heat pump. Compared with existing products, this product has been improved in structure by eliminating the four-way reversing valve 2 and filter 5 in the original system and adding an economizer 14 and radiator 15.

[0018] In a further solution of this embodiment, a fan 8 is installed next to the radiator 15 to increase the heat dissipation efficiency of the radiator 15 .

[0019] In a further solution of this embodiment, the fan 8 adopts an axial flow fan, which is easily available in the market and has good performance.

[0020] In a further solution of this embodiment, a throttle is installed at the outlet of the compressor 1 to control the flow rate and pressure of the compressor 1, thereby achieving pressure buffering of the fluid and reducing impact force.

[0021] Example 2 See Figure 1-2 A frost-free air source heat pump system includes a compressor 1, an economizer 14, a throttle valve 6, a radiator 15 and an evaporator 7. The two sides of the compressor 1 are respectively connected to one side of the condenser 3 and one side of the gas-liquid separator 9, and the other side of the gas-liquid separator 9 is connected to one side of the economizer 14. The remaining three sides of the condenser 3 are respectively connected to one side of the hot water circulation pump 10, the water tank 12 and one side of the liquid storage tank 4. The other side of the hot water circulation pump 10 is respectively connected to the water tank 12 and the cold water inlet 11. A hot water outlet 13 is provided on the water tank 12. The remaining three sides of the economizer 14 are respectively connected to the other side of the liquid storage tank 4, the evaporator 7 and the radiator 15. The evaporator 7 and the radiator 15 are connected through the throttle valve 6.

[0022] In a further solution of this embodiment, the throttle valve 6 is an expansion valve, which has a good throttling effect, low cost and is easy to replace.

[0023] In a further solution of this embodiment, the compressor 1 adopts a single-stage screw compressor, which has a simple structure, is easy to maintain, has good operating stability and low operating noise.

[0024] A working process of a frost-free air source heat pump system includes the following steps: When frost forms on the surface of the evaporator 7, the high-temperature and high-pressure medium of the compressor 1 directly enters the condenser 3 and heats the heat exchange medium in the condenser 3. The heat exchange medium flows through the liquid storage tank 4 and enters the economizer 14, thereby returning air to the compressor 1 for heat exchange. The heat exchange medium in the economizer 14 flows through the radiator 15 and the throttle valve 6 and then flows through the evaporator 7, thereby extracting heat energy from the air. After extracting the heat energy from the air, the heat exchange medium flows through the economizer 14, which can absorb waste heat and increase enthalpy, and finally returns to the compressor 1 through the gas-liquid separator 9, which can be compressed and circulated to achieve the purpose of heating.

[0025] It should be noted that, in the present invention, unless otherwise expressly specified or limited, the terms "fixed" and "disposed" should be understood in a broad sense. For example, they can refer to welded connections, bolted connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise expressly specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0026] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A frost-free air source heat pump system, comprising a compressor, an economizer, a throttle valve, a radiator and an evaporator, characterized in that: The two sides of the compressor are respectively connected to one side of the condenser and one side of the gas-liquid separator, the other side of the gas-liquid separator is connected to one side of the economizer, the other three sides of the condenser are respectively connected to one side of the hot water circulation pump, the water tank and one side of the liquid storage tank, the other side of the hot water circulation pump is respectively connected to the water tank and the cold water inlet, and a hot water outlet is provided on the water tank. The other three sides of the economizer are respectively connected to the other side of the liquid storage tank, the evaporator and the radiator, and the evaporator and radiator are connected through a throttle valve.

2. The frost-free air source heat pump system according to claim 1, characterized in that: A fan is also installed beside the radiator.

3. The frost-free air source heat pump system according to claim 2, characterized in that: The fan is an axial flow fan.

4. The frost-free air source heat pump system according to claim 1, characterized in that: A throttle is installed at the outlet of the compressor.

5. The frost-free air source heat pump system according to claim 1 or 4, characterized in that: The throttle valve is an expansion valve.

6. The frost-free air source heat pump system according to claim 1 or 4, characterized in that: The compressor adopts a single-stage screw compressor.

7. A working process of a frost-free air source heat pump system, characterized in that: The following steps are involved: When frost forms on the evaporator surface, the high-temperature and high-pressure medium of the compressor directly enters the condenser and heats the heat exchange medium in the condenser. The heat exchange medium flows through the liquid storage tank and enters the economizer. The heat exchange medium in the economizer flows through the radiator and the throttle valve and then flows through the evaporator. The heat exchange medium in the evaporator flows through the economizer and the gas-liquid separator and returns to the compressor.

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