A double-stage energy-efficient low-ambient-temperature variable-frequency air-source heat pump unit

Abstract

The utility model discloses a double-stage energy-efficient low-ambient-temperature variable-frequency air source heat pump unit, which comprises: a first compressor, a second compressor is arranged on the intermediate heat exchanger, a high-temperature circulation loop is arranged on the first compressor, a three-way dispersed reversing valve and a three-way collective reversing valve are arranged on the high-temperature circulation loop, a first condenser and a second condenser are arranged between the three-way dispersed reversing valve and the three-way collective reversing valve, a turbulent fin tube is arranged on the first condenser, a serrated fin tube is arranged on the second condenser, a low-temperature circulation loop is arranged at the other end of the three-way collective reversing valve, and a second control valve and an evaporator are arranged on the low-temperature circulation loop. Through the above device, through the cooperation of the first condenser, the second condenser, the turbulent fin tube, and the serrated fin tube, the condensation efficiency can be improved, so that the refrigerant can be fully condensed, thereby improving the overall performance of the system.

Description

Technical Field

[0001] The utility model relates to the technical field of air source heat pumps, in particular to a double-primary energy-efficient low ambient temperature variable frequency air source heat pump unit. Background Art

[0002] Existing air source heat pump technology has poor performance at low ambient temperatures, reduced energy efficiency, and is difficult to meet energy-saving requirements. For example, a Chinese patent discloses a "low-temperature variable-frequency air source heat pump unit" with an application number of "CN201921762072.4". It uses two sets of slider-type one-way valves to achieve heating mode through the economizer, while cooling mode does not pass through the economizer, reducing unnecessary pressure drop in the refrigerant circulation process during the refrigeration cycle and improving the unit's refrigeration capacity. However, its limitations in low-temperature environments, system complexity, maintenance requirements, and increased initial costs may limit its application. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art, and provides a double-stage energy-efficient low-ambient-temperature variable-frequency air source heat pump unit, through the cooperation of the first condenser, the second condenser, the turbulent fin tube, and the serrated fin tube. Since the turbulent fin tube is a micro-turbulent structure, the fin increases the turbulence of the air by increasing the surface area, thereby improving the heat exchange efficiency with the air. The serrated fin tube adopts a serrated shape, which increases the heat transfer area on the air side, while enhancing the turbulence effect and promoting heat exchange on the air side. The fin spacing is finely designed to ensure the heat exchange efficiency while reducing wind resistance. With the assistance of the cooling fan, the air is forced to The air flows through the finned tubes, taking away the heat released by the refrigerant. Through the cooperation of the first compressor, the intermediate heat exchanger and the second compressor, since the two compressors are connected in series, the first compressor is responsible for primary compression, compressing the low-pressure gaseous refrigerant to the intermediate pressure, and the second compressor further compresses it. Compressing the refrigerant to high pressure can effectively increase the compression ratio of the refrigerant, thereby maintaining a high heating capacity and energy efficiency in a low-temperature environment. The intermediate heat exchanger cools down the refrigerant after primary compression through heat exchange, and then enters the second compressor, reducing the load of the secondary compression, improving the efficiency of the entire system, and also reducing the wear and energy consumption of the compressor.

[0004] The utility model also provides a double-stage energy-efficient low-ambient-temperature variable-frequency air source heat pump unit, comprising: a first compressor, an intermediate heat exchanger is arranged on the first compressor, an outer layer of the intermediate heat exchanger is arranged with a heat-insulating layer, a second compressor is arranged on the intermediate heat exchanger, a high-temperature circulation loop is arranged on the first compressor, a three-way dispersed reversing valve and a three-way collective reversing valve are arranged on the high-temperature circulation loop; a first condenser and a second condenser are arranged between the three-way dispersed reversing valve and the three-way collective reversing valve, a turbulent fin tube is arranged on the first condenser, a serrated fin tube is arranged on the second condenser, a low-temperature circulation loop is arranged at the other end of the three-way collective reversing valve, and a second control valve and an evaporator are arranged on the low-temperature circulation loop. Through the above device, through the cooperation of the first condenser, the second condenser, the turbulent fin tube, and the serrated fin tube, the condensation efficiency can be improved, so that the refrigerant can be fully condensed, thereby improving the overall performance of the system.

[0005] According to the double-stage energy-efficient low-ambient-temperature variable-frequency air source heat pump unit described in the utility model, the intermediate heat exchanger is located between the second compressor and the first compressor, and the insulation layer is made of insulation cotton material. Through the above device, the heat loss is reduced through the insulation layer.

[0006] According to the double-stage energy-efficient low ambient temperature variable frequency air source heat pump unit described in the utility model, an oil separator is arranged on the second compressor, and the oil separator is connected to the first compressor and the second compressor through an oil pipe. Through the above device, through the oil separator, the safe and efficient operation of the device is guaranteed.

[0007] According to the double-stage energy-efficient low-temperature variable-frequency air source heat pump unit described in the utility model, the high-temperature circulation loop is detachably connected to the first compressor, the intermediate heat exchanger, the second compressor, the oil separator, the first condenser and the second condenser, and the outer layer of the high-temperature circulation loop is provided with a protective layer. Through the above device, through the position of the high-temperature circulation loop, it is convenient to adapt to the gas and liquid discharged by the device to adapt to the pipeline.

[0008] According to the double-stage energy-efficient low-temperature variable-frequency air source heat pump unit described in the utility model, a first control valve is provided on the high-temperature circulation loop, and the first control valve is located between the first condenser, the second compressor and the three-way dispersed reversing valve. Through the above device, the flow rate of the gas can be conveniently controlled through the first control valve.

[0009] According to the double-stage energy-efficient low-ambient-temperature variable-frequency air source heat pump unit described in the utility model, the first condenser and the second condenser are connected in parallel, and a heat dissipation fan is provided on both the first condenser and the second condenser. Through the above device, the heat released by the refrigerant can be conveniently taken away by the heat dissipation fan.

[0010] According to the double-stage energy-efficient low ambient temperature variable frequency air source heat pump unit described in the utility model, the spoiler fin tube is a micro spoiler structure, and the serrated fin tube is a serrated shape. Through the above device, the turbulence of the air is increased through the structure of the spoiler fin tube and the serrated fin tube, thereby improving the heat exchange efficiency.

[0011] According to the double-stage energy-efficient low ambient temperature variable frequency air source heat pump unit described in the utility model, a liquid reservoir is provided between the three-way collective reversing valve and the second control valve, the low-temperature circulation loop runs through the evaporator, and the evaporator is located between the second control valve and the first compressor. Through the above device, the stored refrigerant is released through the liquid reservoir.

[0012] Beneficial Effects

[0013] 1. Compared with the prior art, the dual-stage energy-efficient low ambient temperature variable frequency air source heat pump unit is used, through the cooperation of the first condenser, the second condenser, the turbulent fin tube and the serrated fin tube. Since the turbulent fin tube is a micro-turbulent structure, the fin increases the surface area, causing the turbulence of the air to increase, thereby improving the heat exchange efficiency with the air. The serrated fin tube adopts a serrated shape, which increases the heat transfer area on the air side, while enhancing the turbulence effect and promoting the heat exchange on the air side. The fin spacing is finely designed to ensure the heat exchange efficiency while reducing wind resistance. With the assistance of the cooling fan, the air is forced to flow through the fin tube to take away the heat released by the refrigerant.

[0014] 2. Compared with the prior art, the dual-stage energy-efficient low-ambient-temperature variable-frequency air source heat pump unit is used, through the cooperation of the first compressor, the intermediate heat exchanger and the second compressor. Since the two compressors are connected in series, the first compressor is responsible for primary compression, compressing the low-pressure gaseous refrigerant to the intermediate pressure, and the second compressor further compresses, compressing the refrigerant to high pressure, which can effectively improve the compression ratio of the refrigerant, thereby maintaining a high heating capacity and energy efficiency in a low-temperature environment. The intermediate heat exchanger cools down the refrigerant after primary compression through heat exchange, and then enters the second compressor, reducing the load of the secondary compression, improving the efficiency of the entire system, and also reducing the wear and energy consumption of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0016] Figure 1 This is the main view of the utility model double-first-stage energy-efficient low ambient temperature variable frequency air source heat pump unit;

[0017] Figure 2 This utility model double first-stage energy-efficient low ambient temperature variable frequency air source heat pump unit Figure 1 Enlarged view of point A in the middle;

[0018] Figure 3This utility model double first-stage energy-efficient low ambient temperature variable frequency air source heat pump unit Figure 1 Enlarged view of point B in the middle.

[0019] Legend:

[0020] 1. First compressor; 2. Second compressor; 3. Evaporator; 4. Intermediate heat exchanger; 5. Insulation layer; 6. Oil separator; 7. Oil pipe; 8. High-temperature circulation loop; 9. Three-way dispersed reversing valve; 10. First control valve; 11. First condenser; 12. Cooling fan; 13. Turbine fin tube; 14. Second condenser; 15. Serrated fin tube; 16. Three-way collective reversing valve; 17. Liquid storage tank; 18. Second control valve; 19. Low-temperature circulation loop. DETAILED DESCRIPTION

[0021] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0022] Reference Figure 1-3 The utility model embodiment is a double-stage energy-efficient low-temperature variable-frequency air source heat pump unit, which includes: a first compressor 1, the first compressor 1 performs primary compression to compress the low-pressure gaseous refrigerant to an intermediate pressure, an intermediate heat exchanger 4 is arranged on the first compressor 1, the intermediate heat exchanger 4 cools down the refrigerant after primary compression, an outer layer of the intermediate heat exchanger 4 is provided with a thermal insulation layer 5, the thermal insulation layer 5 insulates the intermediate heat exchanger 4, the intermediate heat exchanger 4 is located between the second compressor 2 and the first compressor 1, the thermal insulation layer 5 is a thermal insulation cotton material, a second compressor 2 is arranged on the intermediate heat exchanger 4, the second compressor 2 further compresses the refrigerant to a high pressure, an oil separator 6 is arranged on the second compressor 2, the oil separator 6 ensures the safe and efficient operation of the device, and the oil separator 6 and the first compressor The first compressor 1 and the second compressor 2 are connected by an oil pipe 7. A high-temperature circulation loop 8 is arranged on the first compressor 1. The high-temperature circulation loop 8 is detachably connected to the first compressor 1, the intermediate heat exchanger 4, the second compressor 2, the oil separator 6, the first condenser 11 and the second condenser 14. A protective layer is arranged on the outer layer of the high-temperature circulation loop 8. The protective layer protects the high-temperature circulation loop 8 to prevent scalding. A three-way dispersion reversing valve 9 and a three-way collecting reversing valve 16 are arranged on the high-temperature circulation loop 8. The three-way dispersion reversing valve 9 and the three-way collecting reversing valve 16 are convenient for dispersing and concentrating the refrigerant. A first control valve 10 is arranged on the high-temperature circulation loop 8. The first control valve 10 controls the flow rate of the refrigerant. The first control valve 10 is located between the first condenser 11, the second compressor 2 and the three-way dispersion reversing valve 9.

[0023] A first condenser 11 and a second condenser 14 are arranged between the three-way dispersed reversing valve 9 and the three-way collective reversing valve 16. The first condenser 11 and the second condenser 14 process the refrigerant. The first condenser 11 and the second condenser 14 are connected in parallel. A heat dissipation fan 12 is arranged on the first condenser 11 and the second condenser 14. The heat dissipation fan 12 dissipates heat for the first condenser 11 and the second condenser 14. A spoiler fin tube 13 is arranged on the first condenser 11. The spoiler fin tube 13 increases the turbulence of the air. The spoiler fin tube 13 is a micro spoiler structure. A serrated fin tube 15 is provided, which increases the heat exchange area. The serrated fin tube 15 is in a serrated shape. A low-temperature circulation loop 19 is provided at the other end of the three-way collecting reversing valve 16. A second control valve 18 and an evaporator 3 are provided on the low-temperature circulation loop 19. The second control valve 18 controls the flow rate of the refrigerant. The evaporator 3 processes the refrigerant. A liquid accumulator 17 is provided between the three-way collecting reversing valve 16 and the second control valve 18. The liquid accumulator 17 releases the stored refrigerant. The low-temperature circulation loop 19 runs through the evaporator 3. The evaporator 3 is located between the second control valve 18 and the first compressor 1.

[0024] Working principle: When in use, the first compressor 1 first compresses the low-pressure gaseous refrigerant to an intermediate pressure, and cools the refrigerant after primary compression through the intermediate heat exchanger 4. The second compressor 2 further compresses the refrigerant to a high pressure, and the high-temperature and high-pressure gas is dispersed to the first condenser 11 and the second condenser 14 through the three-way dispersion reversing valve 9. The first control valve 10 controls the flow rate. The turbulent fin tube 13 on the first condenser 11 increases the turbulence of the air, thereby improving the heat exchange efficiency. The serrated fin tube 15 on the second condenser 14 further enhances the air turbulence and improves the heat exchange efficiency. Finally, it becomes a high-temperature and high-pressure liquid and passes through the three-way collecting reversing valve 16, enters the liquid storage tank 17, and enters the second control valve 18 after coming out, becomes a low-temperature and low-pressure liquid and enters the evaporator 3. The low-temperature and low-pressure gas coming out of the evaporator 3 enters the first compressor 1 to complete the cycle.

[0025] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A double-stage energy-efficient low ambient temperature variable frequency air source heat pump unit, characterized in that: include: A first compressor (1), an intermediate heat exchanger (4) is arranged on the first compressor (1), an outer layer of the intermediate heat exchanger (4) is provided with a heat-insulating layer (5), a second compressor (2) is arranged on the intermediate heat exchanger (4), a high-temperature circulation loop (8) is arranged on the first compressor (1), and a three-way dispersing reversing valve (9) and a three-way collecting reversing valve (16) are arranged on the high-temperature circulation loop (8); A first condenser (11) and a second condenser (14) are arranged between the three-way dispersing reversing valve (9) and the three-way collecting reversing valve (16); a turbulent fin tube (13) is arranged on the first condenser (11); a serrated fin tube (15) is arranged on the second condenser (14); a low-temperature circulation loop (19) is arranged at the other end of the three-way collecting reversing valve (16); and a second control valve (18) and an evaporator (3) are arranged on the low-temperature circulation loop (19).

2. A double-stage energy-efficient low ambient temperature variable frequency air source heat pump unit according to claim 1, characterized in that: The intermediate heat exchanger (4) is located between the second compressor (2) and the first compressor (1), and the thermal insulation layer (5) is made of thermal insulation cotton material.

3. According to claim 1, a double-stage energy-efficient low ambient temperature variable frequency air source heat pump unit is characterized in that: An oil separator (6) is provided on the second compressor (2), and the oil separator (6) is connected to the first compressor (1) and the second compressor (2) via an oil pipe (7).

4. A double-stage energy-efficient low ambient temperature variable frequency air source heat pump unit according to claim 3, characterized in that: The high-temperature circulation loop (8) is detachably connected to the first compressor (1), the intermediate heat exchanger (4), the second compressor (2), the oil separator (6), the first condenser (11) and the second condenser (14), and the outer layer of the high-temperature circulation loop (8) is provided with a protective layer.

5. A double-stage energy-efficient low ambient temperature variable frequency air source heat pump unit according to claim 1, characterized in that: The high-temperature circulation loop (8) is provided with a first control valve (10), and the first control valve (10) is located between the first condenser (11), the second compressor (2) and the three-way dispersed reversing valve (9).

6. A double-stage energy-efficient low ambient temperature variable frequency air source heat pump unit according to claim 1, characterized in that: The first condenser (11) and the second condenser (14) are connected in parallel, and a heat dissipation fan (12) is provided on each of the first condenser (11) and the second condenser (14).

7. A double-stage energy-efficient low ambient temperature variable frequency air source heat pump unit according to claim 1, characterized in that: The spoiler fin tube (13) is a micro spoiler structure, and the serrated fin tube (15) is in a serrated shape.

8. The double-stage energy-efficient low ambient temperature variable frequency air source heat pump unit according to claim 1, characterized in that: A liquid reservoir (17) is provided between the three-way collecting reversing valve (16) and the second control valve (18), the low-temperature circulation loop (19) runs through the evaporator (3), and the evaporator (3) is located between the second control valve (18) and the first compressor (1).

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