Composite enthalpy increasing system of air source heat pump

Abstract

The utility model relates to a composite enthalpy increasing system of an air source heat pump. The composite enthalpy increasing system comprises a compressor, a condenser, a first economizer, a first expansion valve, a second economizer, a second expansion valve and an evaporator. The compressor is provided with an air supply port, an air suction port and an exhaust port; a condensation inlet and a condensation outlet are formed in the condenser, and the condensation inlet is communicated with the exhaust port through an exhaust pipe; a first inlet, a first outlet, a second inlet and a second outlet are formed in the first economizer, the second inlet and the second outlet are communicated through a connecting header pipe and a first connecting branch pipe, and a first expansion valve is arranged on the first connecting branch pipe; a third inlet, a third outlet, a fourth inlet and a fourth outlet are formed in the second economizer, the third outlet is communicated with the fourth inlet through an auxiliary pipeline, and a second expansion valve and an evaporator are sequentially arranged on the auxiliary pipeline. Compared with the prior art, the utility model has the advantages of reducing the suction and exhaust pressure difference of the compressor, prolonging the service life of the compressor, improving the heating energy efficiency, saving energy and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of air source heat pumps, and in particular relates to an air source heat pump composite enthalpy increasing system. Background Art

[0002] Air-injection enthalpy-increasing technology is a very advanced and efficient air-conditioning technology. It can significantly improve the cooling capacity and efficiency of the system and has very broad application prospects and market prospects. It can be applied not only to household air conditioners and commercial air conditioners, but also to other refrigeration equipment, such as refrigerators, refrigerated trucks, etc. At the same time, as people pay more and more attention to energy efficiency, air-injection enthalpy-increasing technology is also being used more and more widely.

[0003] Air replenishment and enthalpy increase technology has also been widely used in low-temperature air source heat pumps, which has improved the heating efficiency of air source heat pumps in low-temperature environments. However, the heating efficiency is greatly reduced in ultra-low temperature environments, affecting the service life of the compressor. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art and solve the technical problems of the existing air supplementation enthalpy increase technology such as large attenuation of heating efficiency and short service life of the compressor in ultra-low temperature environments, the utility model provides an air source heat pump composite enthalpy increase system.

[0005] The utility model is implemented through the following technical solutions.

[0006] The utility model provides an air source heat pump compound enthalpy increasing system, comprising a compressor, a condenser, a first economizer, a first expansion valve, a second economizer, a second expansion valve and an evaporator;

[0007] The compressor is provided with an air supply port, an air intake port and an air exhaust port;

[0008] The condenser is provided with a condensation inlet, a condensation outlet, a water inlet and a water outlet, and the condensation inlet is connected with the exhaust port through an exhaust pipe;

[0009] The first economizer is provided with a first inlet, a first outlet, a second inlet and a second outlet, the first inlet is connected to the condensation outlet, the first outlet is connected to the air supply port, the second inlet and the second outlet are connected to the first connecting branch pipe through a connecting main pipe, and the first connecting branch pipe is provided with a first expansion valve;

[0010] The second economizer is provided with a third inlet, a third outlet, a fourth inlet and a fourth outlet, the third inlet and the second outlet are connected through a connecting main pipe and a second connecting branch pipe, the end of the connecting main pipe is connected with the starting ends of the first connecting branch pipe and the second connecting branch pipe respectively; the third outlet and the fourth inlet are connected through an auxiliary pipeline, and the auxiliary pipeline is sequentially provided with a second expansion valve and an evaporator; the fourth outlet is connected with the air intake port through an air intake pipe;

[0011] The air source heat pump compound enthalpy increase system also includes a control unit, and the control unit is electrically connected to the first expansion valve and the second expansion valve respectively.

[0012] Further, the first economizer and the second economizer are both flash economizers.

[0013] Furthermore, the first expansion valve and the second expansion valve are both electronic expansion valves.

[0014] Furthermore, the air source heat pump compound enthalpy increase system also includes a filter, and the filter is arranged on the intake pipe.

[0015] The beneficial effects achieved by the utility model are as follows: the utility model uses a first economizer and a first expansion valve to convert the high-temperature and high-pressure liquid passing through the compressor and the condenser into a medium-pressure and medium-temperature gas-liquid mixture through the first economizer, further converts it into medium-pressure and medium-temperature gas through the first expansion valve, and further converts it into medium-pressure and low-temperature gas through the first economizer and returns to the air supply port, thereby increasing the suction temperature and pressure in the refrigeration cycle and improving the heating efficiency of the air source heat pump; a second economizer and a second expansion valve are used to convert the medium-pressure and medium-temperature gas into low-pressure and low-temperature gas after passing through the second expansion valve, and further converts it into low-pressure and medium-temperature gas after passing through the second economizer, the suction temperature of the compressor is increased by 5-10°, the suction pressure is increased by 2-3kPa, the suction and exhaust pressure difference of the compressor is reduced, and the heating energy efficiency is increased by 10-15% on the basis of the air supply and enthalpy increase of the first economizer and the first expansion valve, further saving energy, and significantly extending the service life of the compressor, reducing the risk of its wear and failure, and bringing users a more economical, efficient and reliable heating experience.

[0016] Compared with the prior art, the utility model has the advantages of reducing the suction and exhaust pressure difference of the compressor, increasing the service life of the compressor, improving the heating energy efficiency, and saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] In the figure: 1. compressor; 2. condenser; 3. first economizer; 4. first expansion valve; 5. second economizer; 6. second expansion valve; 7. evaporator; 8. air supply port; 9. air intake port; 10. air exhaust port; 11. condensation inlet; 12. condensation outlet; 13. water inlet; 14. water outlet; 15. exhaust pipe; 16. first inlet; 17. first outlet; 18. second inlet; 19. second outlet; 20. connecting main pipe; 21. first connecting branch pipe; 22. third inlet; 23. third outlet; 24. fourth inlet; 25. fourth outlet; 26. second connecting branch pipe; 27. auxiliary pipeline; 28. air intake pipe. DETAILED DESCRIPTION

[0019] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] like Figure 1 As shown, the air source heat pump compound enthalpy increase system includes a compressor 1, a condenser 2, a first economizer 3, a first expansion valve 4, a second economizer 5, a second expansion valve 6 and an evaporator 7.

[0021] The compressor 1 is provided with an air supply port 8, an air intake port 9 and an air exhaust port 10. The compressor 1 increases the pressure and temperature by compressing the gas so that the refrigerant can evaporate and condense at room temperature. The air supply port 8 is mainly used to introduce a certain amount of external gas, which will be compressed together with the refrigerant.

[0022] The condenser 2 is provided with a condensation inlet 11, a condensation outlet 12, a water inlet 13 and a water outlet 14. The condensation inlet 11 is connected to the exhaust port 10 through an exhaust pipe 15. The external gas and the refrigerant are compressed into a high-temperature and high-pressure gas in the compressor 1, enter the condenser 2 through the exhaust pipe 15, and are condensed into a high-temperature and high-pressure liquid.

[0023] The first economizer 3 is provided with a first inlet 16, a first outlet 17, a second inlet 18 and a second outlet 19. The first economizer 3 is a flash economizer. The first inlet 16 is connected to the condensation outlet 12, the first outlet 17 is connected to the air supply port 8, the second inlet 18 and the second outlet 19 are connected to the first connecting branch pipe 21 through the connecting main pipe 20, and the first connecting branch pipe 21 is provided with a first expansion valve 4, which is an electronic expansion valve. The liquid condensed into high-temperature and high-pressure enters the first economizer 3 and has three branches. One is to enter the first economizer 3 and become a medium-pressure and medium-temperature gas-liquid mixture and then return to the gas replenishment port 8 for gas replenishment and enthalpy increase. The second is to enter the first economizer 3 and become a medium-pressure and medium-temperature gas-liquid mixture and then further pass through the first expansion valve 4 to become a medium-pressure and medium-temperature gas and then go back through the first economizer 3 to be transformed into a medium-pressure and low-temperature gas and return to the gas replenishment port 8 for gas replenishment and enthalpy increase. The third is to enter the first economizer 3 and become a medium-pressure and medium-temperature gas-liquid mixture and then enter the second economizer 5 to continue the subsequent compound enthalpy increase, which increases the suction temperature and pressure in the refrigeration cycle, improves the heating efficiency of the air source heat pump and achieves the effect of gas replenishment and enthalpy increase.

[0024] The second economizer 5 is provided with a third inlet 22, a third outlet 23, a fourth inlet 24 and a fourth outlet 25, and the second economizer 5 is a flash economizer. The third inlet 22 and the second outlet 19 are connected through a connecting main pipe 20 and a second connecting branch pipe 26, and the end of the connecting main pipe 20 is respectively connected with the starting ends of the first connecting branch pipe 21 and the second connecting branch pipe 26. The third outlet 23 and the fourth inlet 24 are connected through an auxiliary pipeline 27, and the auxiliary pipeline 27 is provided with a second expansion valve 6 and an evaporator 7 in sequence, and the second expansion valve 6 is an electronic expansion valve. The fourth outlet 25 is connected to the air intake port 9 through the air intake pipe 28. After passing through the first economizer 3 and becoming a medium-pressure and medium-temperature gas-liquid mixture, the mixture enters the second economizer 5 along the connecting main pipe 20 and the second connecting branch pipe 26 and enters the second expansion valve 6 to become a low-pressure and low-temperature gas. After passing through the evaporator 7 and the second economizer 5 and becoming a low-pressure and medium-temperature gas, the mixture returns to the compressor 1. During the whole process, the suction temperature of the compressor 1 is increased by 5-10°, and the suction pressure is increased by 2-3kPa, which reduces the suction and exhaust pressure difference of the compressor 1. Reducing the suction and exhaust pressure difference of the compressor 1 helps to reduce its internal wear and the risk of failure. With the support of the compound enthalpy increase technology, the compressor 1 can operate under more stable and milder conditions, extending its service life. Reducing the suction and exhaust pressure difference can also reduce power consumption and improve the energy efficiency ratio of the system. The heating energy efficiency is improved by 10-15% on the basis of the air supplementation and enthalpy increase of the first economizer 3 and the first expansion valve 4.

[0025] The air source heat pump compound enthalpy increase system also includes a control unit, which is electrically connected to the first expansion valve 4 and the second expansion valve 6 respectively. The control unit can automatically adjust different enthalpy increase strategies according to factors such as ambient temperature and load demand, so that the heat pump system can maintain the best heating effect under various conditions and improve the reliability and comfort of the system. The air source heat pump compound enthalpy increase system also includes a filter, which is arranged on the intake pipe 28 and is mainly used to filter impurities and moisture in the system.

[0026] The working process of the utility model is as follows:

[0027] Turn on the control unit, which is electrically connected to the first expansion valve 4 and the second expansion valve 6 respectively;

[0028] The external gas and the refrigerant in the compressor 1 are compressed into high-temperature and high-pressure gas under the action of the compressor 1, enter the condenser 2 through the exhaust pipe 15, and are condensed into high-temperature and high-pressure liquid. The condensed high-temperature and high-pressure liquid enters the first economizer 3 and has three branches. One is to enter the first economizer 3 to become a medium-pressure and medium-temperature gas-liquid mixture and then return to the gas replenishing port 8 for gas replenishment and enthalpy increase. The second is to enter the first economizer 3 to become a medium-pressure and medium-temperature gas-liquid mixture and then further pass through the first expansion valve 4 to become a medium-pressure and medium-temperature gas and then return to the first economizer 3 to become a medium-pressure and low-temperature gas and return to the gas replenishing port 8 for gas replenishment and enthalpy increase. The third is to enter the first economizer 3 to become a medium-pressure and medium-temperature gas-liquid mixture and then enter the second economizer 5 for compound enthalpy increase. After passing through the first economizer 3 to become a medium-pressure and medium-temperature gas-liquid mixture, it enters the second economizer 5 along the connecting main pipe 20 and the second connecting branch pipe 26 and enters the second economizer 5 and enters the second expansion valve 6 to be converted into a low-pressure and low-temperature gas, and then continues to pass through the evaporator 7 and the second economizer 5 to be converted into a low-pressure and medium-temperature gas and then returns to the compressor 1.

[0029] The implementation modes 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 implementation modes. The implementation modes can still be changed within the knowledge scope of ordinary technicians in the field. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Air source heat pump compound enthalpy increase system, characterized by: It comprises a compressor (1), a condenser (2), a first economizer (3), a first expansion valve (4), a second economizer (5), a second expansion valve (6) and an evaporator (7); The compressor (1) is provided with an air supply port (8), an air intake port (9) and an air discharge port (10); The condenser (2) is provided with a condensation inlet (11), a condensation outlet (12), a water inlet (13) and a water outlet (14); the condensation inlet (11) is connected to the exhaust port (10) via an exhaust pipe (15); The first economizer (3) is provided with a first inlet (16), a first outlet (17), a second inlet (18) and a second outlet (19); the first inlet (16) is connected to the condensation outlet (12); the first outlet (17) is connected to the air supply port (8); the second inlet (18) and the second outlet (19) are connected to a first connecting branch pipe (21) via a connecting main pipe (20); and the first connecting branch pipe (21) is provided with a first expansion valve (4); The second economizer (5) is provided with a third inlet (22), a third outlet (23), a fourth inlet (24) and a fourth outlet (25); the third inlet (22) and the second outlet (19) are connected via a connecting main pipe (20) and a second connecting branch pipe (26); the end of the connecting main pipe (20) is connected to the starting ends of the first connecting branch pipe (21) and the second connecting branch pipe (26) respectively; the third outlet (23) and the fourth inlet (24) are connected via an auxiliary pipeline (27); the auxiliary pipeline (27) is provided with a second expansion valve (6) and an evaporator (7) in sequence; the fourth outlet (25) is connected to the air intake port (9) via an air intake pipe (28); The air source heat pump compound enthalpy increase system also includes a control unit, which is electrically connected to the first expansion valve (4) and the second expansion valve (6) respectively.

2. The air source heat pump compound enthalpy increase system according to claim 1, characterized in that: The first economizer (3) and the second economizer (5) are both flash economizers.

3. The air source heat pump compound enthalpy increase system according to claim 1, characterized in that: The first expansion valve (4) and the second expansion valve (6) are both electronic expansion valves.

4. The air source heat pump compound enthalpy increase system according to claim 1, characterized in that: The air source heat pump compound enthalpy increase system also includes a filter, which is arranged on the air intake pipe (28).

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