An air compression heat pump system

Abstract

This disclosure relates to an air compression heat pump system, which forms a first air passage, a second air passage, and a third air passage. The first air passage inputs air from a target temperature-controlled space into a recovery heat exchanger for heat exchange, and then inputs the heat-exchanged air back into the first air passage or discharges it into the external environment. The second air passage sequentially inputs air from the first air passage or from the external environment into a first heat exchanger, a second heat exchanger, and a recovery heat exchanger for heat exchange, and then inputs the heat-exchanged air into the target temperature-controlled space or discharges it into the external environment. The third air passage inputs air from the external environment into the first and second heat exchangers for heat exchange, and then inputs the heat-exchanged air into the target temperature-controlled space or discharges it into the external environment. This disclosure utilizes air from the target temperature-controlled space or the external environment to regulate the temperature of the target temperature-controlled space, resulting in high temperature regulation efficiency, no environmental impact, low operating pressure, and no safety hazards.

Description

Technical Field

[0001] This disclosure relates to the field of heat pump technology, and more particularly to an air compression heat pump system. Background Technology

[0002] Traditional refrigerants used in heat pump systems, such as Freon, are facing obsolescence due to their failure to meet current environmental protection and carbon neutrality requirements. Related technologies utilize emerging HFCs (hydrofluorocarbons), hydrocarbons, or CO2 as alternative refrigerants. However, using HFCs can contribute to the greenhouse effect, using hydrocarbons poses safety hazards such as combustion and even explosion, and using CO2 results in high operating pressure and large system size. Summary of the Invention

[0003] To overcome the problems existing in the related technologies, this disclosure provides an air compression heat pump system.

[0004] This disclosure proposes an air compression heat pump system, which includes a recovery heat exchanger, a first heat exchanger, and a second heat exchanger; the air compression heat pump system also forms a first air passage, a second air passage, and a third air passage;

[0005] The heat recovery exchanger is used to realize heat exchange between the first air passage and the second air passage; the first heat exchanger and the second heat exchanger are used to realize heat exchange between the second air passage and the third air passage;

[0006] The first air passage is used to input air from the target temperature control space into the heat recovery exchanger for heat exchange, and to input the heat-exchanged air into the second air passage or discharge it into the external environment;

[0007] The second air passage is used to input air from the first air passage or from the external environment into the first heat exchanger, the second heat exchanger and the recovery heat exchanger for heat exchange, and to input the heat-exchanged air into the target temperature control space or discharge it into the external environment;

[0008] The third air passage is used to sequentially input air from the external environment into the first heat exchanger and the second heat exchanger for heat exchange, and to input the heat-exchanged air into the target temperature-controlled space or discharge it into the external environment.

[0009] In one exemplary embodiment, the second air passage is provided with a first compressor, a second compressor, and an expander;

[0010] The first compressor is located upstream of the first heat exchanger. Air from the first air passage or from the external environment enters the first compressor, is compressed by the first compressor, and then enters the first heat exchanger.

[0011] The second compressor is located between the first heat exchanger and the second heat exchanger. Air from the first heat exchanger enters the second compressor, is compressed by the second compressor, and then enters the second heat exchanger.

[0012] The expander is located downstream of the heat recovery exchanger. Air from the heat recovery exchanger enters the expander, and the air after expansion and depressurization by the expander enters the target temperature control space or is discharged into the external environment.

[0013] In one exemplary embodiment, the air compression heat pump system includes:

[0014] A first switching device is used to switch the outlet of the second air passage between the target temperature-controlled space and the external environment.

[0015] The second switching device is used to switch the outlet of the third air passage between the target temperature control space and the external environment.

[0016] A control device is configured to: when the air compression heat pump system is in cooling mode, control the first switching device to connect the outlet of the second air passage to the target temperature-controlled space, and control the second switching device to connect the outlet of the third air passage to the external environment; when the air compression heat pump system is in heating mode, control the first switching device to connect the outlet of the second air passage to the external environment, and control the second switching device to connect the outlet of the third air passage to the target temperature-controlled space.

[0017] In an exemplary embodiment, a first connection passage is provided between the first air passage and the second air passage, and the air compression heat pump system includes:

[0018] The third switching device is used to switch the outlet of the first air passage between the first connecting passage and the external environment, and to switch the inlet of the second air passage between the first connecting passage and the external environment.

[0019] The control device is configured to: when the air compression heat pump system is in cooling mode, control the third switching device to connect the outlet of the first air passage and the inlet of the second air passage to the first connecting passage, or control the third switching device to connect the outlet of the first air passage and the inlet of the second air passage to the external environment, respectively, according to the different cooling modes of the air compression heat pump system; when the air compression heat pump system is in heating mode, control the third switching device to connect the outlet of the first air passage and the inlet of the second air passage to the first connecting passage.

[0020] In an exemplary embodiment, the third air passage includes a first flow path and a second flow path; the first flow path flows through the first heat exchanger, and the second flow path flows through the second heat exchanger; a second connection passage is provided between the first flow path and the second flow path; the air compression heat pump system includes:

[0021] The fourth switching device is used to switch the outlet of the first flow path between the second connection path and the external environment, and to switch the inlet of the second flow path between the second connection path and the external environment.

[0022] The control device is configured to: when the air compression heat pump system is in cooling mode, control the fourth switching device to connect the outlet of the first flow path and the inlet of the second flow path to the second connecting passage, or control the fourth switching device to connect the outlet of the first flow path and the inlet of the second flow path to the external environment, depending on the different cooling modes of the air compression heat pump system; when the air compression heat pump system is in heating mode, control the fourth switching device to connect the outlet of the first flow path and the inlet of the second flow path to the second connecting passage.

[0023] In an exemplary embodiment, the second air passage includes a third flow path and a fourth flow path, the third flow path flowing through the first heat exchanger, and the first compressor being disposed on the third flow path; the fourth flow path flowing through the second heat exchanger, and the second compressor being disposed on the fourth flow path; the air compression heat pump system further includes a fourth air passage, the air in the third flow path flowing to the second compressor or the fourth air passage, and the outlet of the fourth air passage communicating with the outlet of the second air passage; the air compression heat pump system further includes:

[0024] The fifth switching device is used to switch the outlet of the third flow path between the intake port of the second compressor and the inlet of the fourth air passage.

[0025] The control device is configured such that, when the air compression heat pump system is in cooling mode, the control device controls the fifth switching device to connect the outlet of the third flow path to the intake port of the second compressor; when the air compression heat pump system is in heating mode, the control device controls the third air passage and the fourth flow path to disconnect, controls the first switching device to connect the outlet of the second air passage to the target temperature control space, controls the third switching device to connect both the outlet of the first air passage and the inlet of the second air passage to the first connecting passage, and controls the fifth switching device to connect the outlet of the third flow path to the inlet of the fourth air passage.

[0026] In an exemplary embodiment, when the air compression heat pump system is in the third heating mode, the control device is configured to: control the first air passage, the third air passage and the fourth flow path to disconnect; control the first switching device to connect the outlet of the second air passage to the target temperature control space; control the third switching device to connect the inlet of the second air passage to the external environment; and control the fifth switching device to connect the outlet of the third flow path to the inlet of the fourth air passage.

[0027] In an exemplary embodiment, the second air passage includes a fifth flow path that flows through the recovery heat exchanger, and the outlet of the fifth flow path flows to the expander or the target temperature-controlled space; the air compression heat pump system includes:

[0028] The sixth switching device is used to switch the outlet of the fifth flow path between the expander and the target temperature control space.

[0029] The control device is configured such that: when the air compression heat pump system is in cooling mode, the control device controls the sixth switching device to connect the outlet of the fifth flow path to the expander; when the air compression heat pump system is in heating mode, the control device controls the third air passage to disconnect, controls the third switching device to connect the outlet of the first air passage and the inlet of the second air passage to the first connecting passage, controls the fifth switching device to connect the outlet of the third flow path to the suction port of the second compressor, and controls the sixth switching device to connect the outlet of the fifth flow path to the target temperature control space.

[0030] In one exemplary embodiment, the second compressor and the expander are coaxially connected.

[0031] In one exemplary embodiment, the second compressor and the expander are independently configured, and the air compression heat pump system further includes an energy storage device;

[0032] When the air compression heat pump system is running during off-peak electricity hours, the energy storage device converts the kinetic energy generated by the expander into electrical energy for storage.

[0033] When the air compression heat pump system is operating during peak electricity consumption periods, the energy storage device supplies power to the first compressor and / or the second compressor.

[0034] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0035] This disclosure regulates the temperature of the target temperature-controlled space by recycling air from the target temperature-controlled space or the external environment. It boasts high temperature regulation efficiency, no environmental impact, low operating pressure, and no safety hazards. Furthermore, by switching different heat exchange paths under different cooling or heating modes of the air compression heat pump system, it can meet the cooling and heating needs at different temperatures, resulting in better energy efficiency.

[0036] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0037] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0038] Figure 1 This is a schematic diagram of an air compression heat pump system according to an exemplary embodiment.

[0039] Figure 2 This is a schematic diagram of an air compression heat pump system according to an exemplary embodiment.

[0040] in:

[0041] 1-Target temperature control space; 2-Recovery heat exchanger; 3-First compressor; 4-First heat exchanger; 5-Second compressor; 6-Second heat exchanger; 7-Expander; 8-Energy storage device; 10-First air passage; 11-Fifth branch; 20-Second air passage; 21-Third flow path; 22-Fourth flow path; 23-Fifth flow path; 24-First branch; 25-Second branch; 26-Sixth branch; 27-Ninth branch; 28-Tenth branch; 30-Third air passage; 31-First flow path; 32-Second flow path; 33-Third branch; 34-Fourth branch; 35-Seventh branch; 36-Eighth branch; 37-Fourteenth control valve; 40- Fourth air passage; 50-First connection passage; 60-Second connection passage; 100-First switching device; 101-First control valve; 102-Second control valve; 200-Second switching device; 201-Third control valve; 202-Fourth control valve; 300-Third switching device; 301-Fifth control valve; 302-Sixth control valve; 303-Seventh control valve; 400-Fourth switching device; 401-Eighth control valve; 402-Ninth control valve; 403-Tenth control valve; 500-Fifth switching device; 501-Eleventh control valve; 600-Sixth switching device; 601-Twelfth control valve; 602-Thirteenth control valve. Detailed Implementation

[0042] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0043] To meet both environmental protection and carbon neutrality requirements, heat pump systems utilize emerging HFCs (hydrofluorocarbons) refrigerants. While these refrigerants do not contain chlorine atoms and therefore do not damage the ozone layer, they still contribute to the greenhouse effect and global warming. Alternatively, heat pump systems can use hydrocarbons as refrigerants. These refrigerants are generally harmless to the environment, but the high carbon and hydrogen content poses safety hazards such as combustion and even explosion. Another option is CO2, a natural working fluid with excellent environmental performance. However, due to CO2's very low critical temperature, heat pump systems using CO2 cross the critical temperature cycle during cooling and heating, resulting in high operating pressures and large system size.

[0044] To address the aforementioned technical problems, this disclosure proposes an air compression heat pump system, comprising a first air passage, a second air passage, and a third air passage. The first air passage is used to input air from the target temperature-controlled space into a recovery heat exchanger for heat exchange, and then input the heat-exchanged air into the first air passage or discharge it into the external environment. The second air passage is used to sequentially input air from the first air passage or from the external environment into the first heat exchanger, the second heat exchanger, and the recovery heat exchanger for heat exchange, and then input the heat-exchanged air into the target temperature-controlled space or discharge it into the external environment. The third air passage is used to sequentially input air from the external environment into the first heat exchanger and the second heat exchanger for heat exchange, and then input the heat-exchanged air into the target temperature-controlled space or discharge it into the external environment. This disclosure regulates the temperature of the target temperature-controlled space by recovering and utilizing air from the target temperature-controlled space or the external environment, resulting in high temperature regulation efficiency, no environmental impact, low operating pressure, and no safety hazards.

[0045] According to an exemplary embodiment of this disclosure, an air compression heat pump system is proposed. This heat pump system can be applied to static spaces, such as homes or shopping malls, and also to dynamic spaces, such as transport vehicles or ocean-going vessels. The air compression heat pump system of this embodiment can be a single-mode cooling heat pump system, a single-mode heating heat pump system, or a heat pump system that simultaneously includes both cooling and heating modes.

[0046] like Figure 1 and Figure 2 As shown, the air compression heat pump system includes a recovery heat exchanger 2, a first heat exchanger 4, and a second heat exchanger 6. The air compression heat pump system also forms a first air passage 10, a second air passage 20, and a third air passage 30. The recovery heat exchanger 2 is used to achieve heat exchange between the first air passage 10 and the second air passage 20. The first heat exchanger 4 and the second heat exchanger 6 are used to achieve heat exchange between the second air passage 20 and the third air passage 30. The first air passage 10 is used to input air from the target temperature-controlled space 1 into the recovery heat exchanger 2 for heat exchange, and to input the heat-exchanged air into the second air passage 20 or discharge it to the external environment. The airflow direction within the first air passage 10 is as follows: Figure 1 and Figure 2 As shown by the solid arrow in the middle. The second air passage 20 is used to sequentially input air from the first air passage 10 or from the external environment into the first heat exchanger 4, the second heat exchanger 6, and the recovery heat exchanger 2 for heat exchange, and to input the heat-exchanged air into the target temperature-controlled space 1 or discharge it into the external environment. The air flow direction in the second air passage 20 is as follows: Figure 1 and Figure 2As indicated by the solid arrow in the center. The third air passage 30 is used to input air from the external environment into the first heat exchanger 4 and the second heat exchanger 6 for heat exchange, and to input the heat-exchanged air into the target temperature-controlled space 1 or discharge it into the external environment. The airflow direction within the third air passage 30 is as follows: Figure 1 and Figure 2 As indicated by the hollow arrow.

[0047] This embodiment achieves multiple heat exchanges between the first air passage 10, the second air passage 20, and the third air passage 30 by recovering heat exchanger 2, the first heat exchanger 4, and the second heat exchanger 6, thereby improving heat exchange efficiency. Furthermore, when the air compression heat pump system is in cooling or heating mode, the air used to regulate the temperature of the target temperature-regulating space 1 can come from the target temperature-regulating space 1 or from the external environment, further improving temperature regulation efficiency.

[0048] According to an exemplary embodiment of this disclosure, such as Figure 1 and Figure 2 As shown, the second air passage 20 is equipped with a first compressor 3, a second compressor 5, and an expander 7. The first compressor 3 is located upstream of the first heat exchanger 4. Air from the first air passage 10 or from the external environment enters the first compressor 3, is compressed by the first compressor 3, and then enters the first heat exchanger 4. The second compressor 5 is located between the first heat exchanger 4 and the second heat exchanger 6. Air from the first heat exchanger 4 enters the second compressor 5, is compressed by the second compressor 5, and then enters the second heat exchanger 6. Placing the second compressor between the first and second heat exchangers can reduce the energy consumption of the second compressor. This is because, after the air in the second air passage 20 is compressed and heated by the first compressor, it exchanges heat with the air from the external environment in the third air passage 30 in the first heat exchanger 4. The air in the second air passage 20 is cooled down after passing through the first heat exchanger 4, and the cooled air enters the second compressor 5, reducing the energy consumption of the second compressor 5.

[0049] The expander 7 is located downstream of the recovery heat exchanger 2. Air from the recovery heat exchanger 2 enters the expander 7, and after expansion and depressurization, the resulting atmospheric pressure low-temperature air enters the target temperature-regulating space 1 or is discharged into the external environment. When the air compression heat pump system is in cooling mode, the atmospheric pressure low-temperature air after expansion and depressurization by the expander 7 enters the target temperature-regulating space 1. When the heat pump system is in the first heating mode, the atmospheric pressure low-temperature air after expansion and depressurization by the expander 7 is directly discharged into the external environment. The second compressor 5 and the expander 7 can be installed separately or integrated together. In one example, refer to... Figure 1 The second compressor 5 and expander 7 are coaxially connected. The air compression heat pump system also includes a magnetic levitation motor, with both the second compressor 5 and expander 7 coaxially connected to the magnetic levitation motor. In another example, refer to... Figure 2The second compressor 5 and the expander 7 are set up independently. The air compression heat pump system also includes an energy storage device 8. When the air compression heat pump system is running during the off-peak period of electricity consumption, the energy storage device 8 converts the kinetic energy generated by the expander 7 into electrical energy for storage. When the air compression heat pump system is running during the peak period of electricity consumption, the energy storage device 8 supplies power to the first compressor 3 or the second compressor 5 separately, or supplies power to the first compressor 3 and the second compressor 5 simultaneously, so as to save energy.

[0050] In this embodiment, the air in the second air passage 20 is compressed twice by the first compressor 3 and the second compressor 5 to obtain high-temperature and high-pressure air, thereby achieving higher heat exchange efficiency between the second air passage 20 and the third air passage 30. By setting up an expander 7 to cool and depressurize the air in the second air passage 20 after heat exchange with the recovery heat exchanger 2, the air in the second air passage 20 is safely discharged.

[0051] According to an exemplary embodiment of this disclosure, such as Figure 1 and Figure 2 As shown, the air compression heat pump system includes: a first switching device 100, a second switching device 200, and a control device (not shown in the figure). The first switching device 100 is used to switch the outlet of the second air passage 20 between the target temperature-controlled space 1 and the external environment, and the second switching device 200 is used to switch the outlet of the third air passage 30 between the target temperature-controlled space 1 and the external environment. The control device is configured such that: when the air compression heat pump system is in cooling mode, the control device controls the first switching device 100 to connect the outlet of the second air passage 20 to the target temperature-controlled space 1, and controls the second switching device 200 to connect the outlet of the third air passage 30 to the external environment. When the air compression heat pump system is in heating mode, the control device controls the first switching device 100 to connect the outlet of the second air passage 20 to the external environment, and controls the second switching device 200 to connect the outlet of the third air passage 30 to the target temperature-controlled space 1.

[0052] Reference Figure 1 and Figure 2The outlet of the second air passage 20 is provided with a first branch 24 and a second branch 25. The first branch 24 connects the outlet of the second air passage 20 to the external environment, and the second branch 25 connects the outlet of the second air passage 20 to the target temperature-controlled space 1. A first control valve 101 is provided on the first branch 24, and a second control valve 102 is provided on the second branch 25. The first switching device 100 includes the first control valve 101 and the second control valve 102. The outlet of the third air passage 30 is provided with a third branch 33 and a fourth branch 34. The third branch 33 connects the outlet of the third air passage 30 to the external environment, and the fourth branch 34 connects the outlet of the third air passage 30 to the target temperature-controlled space 1. A third control valve 201 is provided on the third branch 33, and a fourth control valve 202 is provided on the fourth branch 34. The second switching device 200 includes the third control valve 201 and the fourth control valve 202. The control device controls the opening and closing of the first control valve 101, the second control valve 102, the third control valve 201, and the fourth control valve 202.

[0053] When the air compression heat pump system is in cooling mode, the control device controls the second control valve 102 of the first switching device 100 to open and the first control valve 101 to close, connecting the second air passage 20 to the target temperature control space 1. Simultaneously, the control device also controls the third control valve 201 of the second switching device 200 to open and the fourth control valve 202 to close, connecting the third air passage 30 to the external environment. At this time, the air in the second air passage 20 is compressed by the first compressor 3, and its temperature and pressure rise to a medium-temperature, medium-pressure state. Then, it passes through the first heat exchanger 4, which transfers heat to the ambient air entering through the third air passage 30, causing its temperature to drop. The cooled air then enters the second compressor 5, where it is compressed again, raising its temperature and pressure to a high-temperature, high-pressure state. After being compressed by the second compressor 5, the air passes through the second heat exchanger 6, which transfers heat to the ambient air coming from the first heat exchanger 4 (at which point the ambient air temperature further rises), causing its temperature to drop to a high-pressure, medium-temperature state. The air after heat exchange in the second heat exchanger 6 enters the recovery heat exchanger 2, where it transfers heat to the cold air flowing out of the target temperature-regulating space 1, becoming a high-pressure, low-temperature state. Finally, it enters the expander 7, expands to a normal-pressure, low-temperature state, and is then sent into the target space, achieving the purpose of cooling the target space. The ambient air is heated twice in the third air passage 30 by the primary and secondary heat exchangers before being discharged into the external environment.

[0054] When the air compression heat pump system is in the first heating mode, the control device controls the first control valve 101 of the first switching device 100 to open and the second control valve 102 to close, connecting the second air passage 20 to the external environment. At the same time, the control device also controls the fourth control valve 202 of the second switching device 200 to open and the third control valve 201 to close, connecting the third air passage 30 to the target temperature control space 1. At this time, the air in the second air passage 20 is compressed by the first compressor 3, and its temperature and pressure rise to a medium temperature and medium pressure state. Then, it passes through the first heat exchanger 4 to transfer heat to the ambient air entering through the third air passage 30, and its temperature decreases. The cooled air enters the second compressor 5, and after being compressed by the second compressor 5, its temperature and pressure rise to a high temperature and high pressure state. After being compressed by the second compressor 5, the air passes through the second heat exchanger 6 to transfer heat to the ambient air coming from the first heat exchanger 4 (at this time, the ambient air temperature further increases), and its temperature decreases to a high pressure and medium temperature state. After heat exchange by the second heat exchanger 6, the air enters the recovery heat exchanger 2 and transfers heat to the lower temperature air flowing out of the target temperature control space 1, and becomes a high pressure and low temperature state. Finally, it enters the expander 7 to expand to a normal pressure and low temperature state and is then discharged to the outside environment. The ambient air enters the target temperature control space 1 after being heated twice by the first heat exchanger 4 and the second heat exchanger 6 in the third air passage 30, thereby increasing the temperature of the target temperature control space 1, achieving the purpose of heating and improving the air quality in the target temperature control space 1.

[0055] In this embodiment, the heat exchanger path is switched by the first switching device 100 and the second switching device 200, thereby realizing both cooling mode and heating mode functions.

[0056] According to an exemplary embodiment of this disclosure, such as Figure 1 and Figure 2 As shown, a first connecting passage 50 is provided between the first air passage 10 and the second air passage 20. The air compression heat pump system includes a third switching device 300, which is used to switch the connection between the outlet of the first air passage 10 and the external environment via the first connecting passage 50, and to switch the connection between the inlet of the second air passage 20 and the external environment via the first connecting passage 50. The control device is configured such that: when the air compression heat pump system is in cooling mode, the control device controls the third switching device 300 to connect both the outlet of the first air passage 10 and the inlet of the second air passage 20 to the first connecting passage 50, or controls the third switching device 300 to connect the outlet of the first air passage 10 and the inlet of the second air passage 20 to the external environment, respectively, depending on the different cooling modes of the air compression heat pump system. When the air compression heat pump system is in heating mode, the control device controls the third switching device 300 to connect both the outlet of the first air passage 10 and the inlet of the second air passage 20 to the first connecting passage 50.

[0057] Reference Figure 1 and Figure 2 The outlet of the first air passage 10 and the inlet of the second air passage 20 are connected to the first connecting passage 50. The outlet of the first air passage 10 is further provided with a fifth branch 11, and the inlet of the second air passage 20 is further provided with a sixth branch 26. The fifth branch 11 connects the outlet of the first air passage 10 to the external environment, and the sixth branch 26 connects the inlet of the second air passage 20 to the external environment. A fifth control valve 301 is provided on the first connecting passage 50, a sixth control valve 302 is provided on the fifth branch 11, and a seventh control valve 303 is provided on the sixth branch 26. The third switching device 300 includes the fifth control valve 301, the sixth control valve 302, and the seventh control valve 303. The control device also controls the opening and closing of the fifth control valve 301, the sixth control valve 302, and the seventh control valve 303.

[0058] When the air compression heat pump system is in the first cooling mode and the first heating mode, the control device controls the sixth control valve 302 and the seventh control valve 303 of the third switching device 300 to close, and controls the fifth control valve 301 to open. At this time, the second air passage 20 is connected to the first air passage 10. Air from the target temperature control space 1 enters the recovery heat exchanger 2 through the first air passage 10. In the recovery heat exchanger 2, it exchanges heat with the air coming out of the second heat exchanger 6 in the second air passage 20, further reducing the air temperature in the second air passage 20. By connecting the second air passage 20 with the first air passage 10, the heat in the target temperature control space 1 is recovered and reused, improving the heat exchange efficiency.

[0059] When the air compression heat pump system is in the second cooling mode, the control device controls the sixth control valve 302 and the seventh control valve 303 of the third switching device 300 to open, and controls the fifth control valve 301 to close. At this time, the inlet of the second air passage 20 and the outlet of the first air passage 10 are connected to the external environment. Fresh air from the external environment can directly enter the first compressor 3 through the second air passage 20, and the subsequent circulation is the same as in the first cooling mode, achieving the purpose of cooling the target temperature-controlled space 1 while improving the air quality of the target temperature-controlled space 1.

[0060] According to an exemplary embodiment of this disclosure, such as Figure 1 and Figure 2As shown, the third air passage 30 includes a first flow path 31 and a second flow path 32. The first flow path 31 flows through a first heat exchanger 4, and the second flow path 32 flows through a second heat exchanger 6. A second connecting passage 60 is provided between the first flow path 31 and the second flow path 32. The air compression heat pump system includes a fourth switching device 400, which is used to switch the outlet of the first flow path 31 between the second connecting passage 60 and the external environment, and to switch the inlet of the second flow path 32 between the second connecting passage 60 and the external environment. The control device is configured such that when the air compression heat pump system is in cooling mode, the control device controls the fourth switching device 400 to connect both the outlet of the first flow path 31 and the inlet of the second flow path 32 to the second connecting passage 60, or controls the fourth switching device 400 to connect the outlet of the first flow path 31 and the inlet of the second flow path 32 to the external environment, respectively, depending on the different cooling modes of the air compression heat pump system. When the air compression heat pump system is in the first heating mode, the control device controls the fourth switching device 400 to connect the outlet of the first flow path 31 and the inlet of the second flow path 32 to the second connection passage 60.

[0061] refer to Figure 1 and Figure 2 A second connecting passage 60 connects the outlet of the first flow path 31 to the inlet of the second flow path 32. A seventh branch 35 is also provided at the outlet of the first flow path 31, and an eighth branch 36 is also provided at the inlet of the second flow path 32. The seventh branch 35 connects the outlet of the first flow path 31 to the external environment, and the eighth branch 36 connects the inlet of the second flow path 32 to the external environment. An eighth control valve 401 is provided on the seventh branch 35, a ninth control valve 402 is provided on the second connecting passage 60, and a tenth control valve 403 is provided on the eighth branch 36. The control device also controls the opening and closing of the eighth control valve 401, the ninth control valve 402, and the tenth control valve 403.

[0062] When the air compression heat pump system is in the third cooling mode or the first heating mode, the control device controls the eighth control valve 401 and the tenth control valve 403 to close and controls the ninth control valve 402 to open. At this time, the outlet of the first flow path 31 and the inlet of the second flow path 32 are both connected to the second connecting passage 60. The air from the outside environment is heated twice by passing through the first heat exchanger 4 and the second heat exchanger 6 in sequence, thereby obtaining a better heat exchange effect.

[0063] When the air compression heat pump system is in the fourth cooling mode, the control device controls the eighth control valve 401 and the tenth control valve 403 to open and the ninth control valve 402 to close. At this time, the outlet of the first flow path 31 and the inlet of the second flow path 32 are connected to the external environment. The ambient air enters the first heat exchanger 4 and the second heat exchanger 6 respectively and is then directly discharged to the external environment. This can reduce the motor power of the compressor and improve the cooling effect while maintaining the same cooling capacity.

[0064] It should be noted that the third cooling mode in this embodiment may belong to the same cooling mode as the first cooling mode or the second cooling mode, or they may belong to different cooling modes. Similarly, the fourth cooling mode may belong to the same cooling mode as the first cooling mode or the second cooling mode, or they may belong to different cooling modes.

[0065] According to an exemplary embodiment of this disclosure, such as Figure 1 and Figure 2 As shown, the second air passage 20 includes a third flow path 21 and a fourth flow path 22. The third flow path 21 flows through the first heat exchanger 4, and the first compressor 3 is disposed on the third flow path 21. The fourth flow path 22 flows through the second heat exchanger 6, and the second compressor 5 is disposed on the fourth flow path 22. The air compression heat pump system also includes a fourth air passage 40, through which air in the third flow path 21 flows to either the second compressor 5 or the fourth air passage 40. The outlet of the fourth air passage 40 is connected to the outlet of the second air passage 20. The air compression heat pump system also includes a fifth switching device 500, which is used to switch the connection between the outlet of the third flow path 21 and the intake port of the second compressor 5 and the inlet of the fourth air passage 40. The control device is configured such that when the air compression heat pump system is in cooling mode, the control device controls the fifth switching device 500 to connect the outlet of the third flow path 21 to the intake port of the second compressor 5. When the air compression heat pump system is in the second heating mode, the control device disconnects the third air passage 30 and the fourth flow path 22, and controls the first switching device 100 to connect the outlet of the second air passage 20 to the target temperature control space 1, thereby connecting the outlet of the fourth air passage 40 to the target temperature control space 1. The device also controls the third switching device 300 to connect the outlet of the first air passage 10 and the inlet of the second air passage 20 to the first connecting passage 50, and controls the fifth switching device 500 to connect the third flow path 21 to the fourth air passage 40.

[0066] refer to Figure 1 and Figure 2The fourth air passage 40 is located between the outlet of the third flow path 21 and the outlet of the second air passage 20. The inlet of the fourth air passage 40 and the suction port of the second compressor 5 are both connected to the outlet of the third flow path 21, and the outlet of the fourth air passage 40 and the outlet of the expander 7 are both connected to the outlet of the second air passage 20. The fifth switching device 500 is an eleventh control valve 501 installed on the fourth air passage 40. The control device controls the opening and closing of the eleventh control valve 501. When the air compression heat pump system is in cooling mode, the control device controls the eleventh control valve 501 of the fifth switching device 500 to close, and the outlet of the third flow path 21 connects to the suction port of the second compressor 5. At this time, the air in the second air passage 20 sequentially enters the first compressor 3 and the first heat exchanger 4 on the third flow path 21, and then sequentially enters the second compressor 5 and the second heat exchanger 6 in the fourth flow path 22.

[0067] When the air compression heat pump system is in the second heating mode, the control device controls the third air passage 30 and the fourth flow path 22 to disconnect. At this time, the first heat exchanger 4, the second heat exchanger 6 and the recovery heat exchanger 2 no longer perform heat exchange functions. The control device also controls the first control valve 101 of the first switching device 100 to close, controls the second control valve 102 to open, controls the sixth control valve 302 and the seventh control valve 303 of the third switching device 300 to close, controls the fifth control valve 301 to open, and controls the eleventh control valve 501 of the fifth switching device 500 to open. At this time, the outlet of the first air passage 10 and the inlet of the second air passage 20 are both connected to the first connecting passage 50, the outlet of the third flow path 21 is connected to the inlet of the fourth air passage 40, and the outlet of the fourth air passage 40 is connected to the target temperature control space 1. The air from the target temperature control space 1 enters the first compressor 3 located on the third flow path 21 through the first air passage 10, and after being compressed and heated by the first compressor 3, it returns to the target temperature control space 1 through the fourth air passage 40, thus recovering and utilizing the heat in the target temperature control space 1 and improving the heating efficiency.

[0068] According to an exemplary embodiment of this disclosure, such as Figure 1 and Figure 2 As shown, when the air compression heat pump system is in the third heating mode, the control device controls the first air passage 10, the third air passage 30 and the fourth flow path 22 to disconnect, controls the first switching device 100 to connect the outlet of the second air passage 20 to the target temperature control space 1, controls the third switching device 300 to connect the inlet of the second air passage 20 to the external environment, and controls the fifth switching device 500 to connect the third flow path 21 and the fourth air passage 40.

[0069] refer to Figure 1 and Figure 2When the air compression heat pump system is in the third heating mode, the control device controls the first air passage 10, the third air passage 30 and the fourth flow path 22 to disconnect. At this time, the recovery heat exchanger 2, the first heat exchanger 4 and the second heat exchanger 6 no longer perform heat exchange function. The control device also controls the first control valve 101 of the first switching device 100 to close, controls the second control valve 102 to open, controls the seventh control valve 303 of the third switching device 300 to open, controls the fifth control valve 301 and the sixth control valve 302 to close, and controls the eleventh control valve 501 of the fifth switching device 500 to open. At this time, the inlet of the second air passage 20 is connected to the external environment, the outlet of the third flow path 21 is connected to the inlet of the fourth air passage 40, and the outlet of the fourth air passage 40 is connected to the target temperature control space 1. Air from the external environment enters the first compressor 3 located on the third flow path 21 through the second air passage 20. After being compressed and heated by the first compressor 3, it enters the target temperature control space 1 through the fourth air passage, which not only achieves the purpose of raising the temperature of the target temperature control space 1, but also improves the air quality of the target temperature control space 1.

[0070] In this embodiment, the control device can control the disconnection of the third air passage 30 in several ways. In one example, the third air passage 30 is disconnected by controlling both the third control valve 201 and the fourth control valve 202 to disconnect. In another example, the third air passage 30 is disconnected by controlling the eighth control valve 401, the ninth control valve 402, and the tenth control valve 403 to disconnect. In yet another example, a fourteenth control valve 37 is provided at the inlet of the third air passage 30, and the third air passage 30 is disconnected by controlling the fourteenth control valve 37 to disconnect. After the third air passage 30 is disconnected, the first heat exchanger and the second heat exchanger no longer perform heat exchange functions.

[0071] In this embodiment, the control device can control the fourth flow path 22 to disconnect in several ways. For example, it can disconnect the fourth flow path 22 by setting a fifteenth control valve (not shown in the figure) at the suction port of the second compressor 5, or between the second compressor 5 and the second heat exchanger 6, or between the second heat exchanger 6 and the recovery heat exchanger 2, and by controlling the fifteenth control valve to close it. After the fourth flow path 22 is disconnected, the second compressor 5 and the expander 7 stop operating, and the second heat exchanger 6 and the recovery heat exchanger 2 no longer perform heat exchange functions.

[0072] In this embodiment, the control device can control the first air passage 10 to disconnect in several ways. In one example, the first air passage 10 is disconnected by controlling the fifth control valve 301 and the sixth control valve 302 to disconnect. In another example, a sixteenth control valve (not shown in the figure) is provided at the inlet of the first air passage 10, and the first air passage 10 is disconnected by controlling the sixteenth control valve to close.

[0073] According to an exemplary embodiment of this disclosure, such as Figure 1and Figure 2 As shown, the second air passage 20 includes a fifth flow path 23, which flows through the recovery heat exchanger 2, and its outlet flows to the expander 7 or the target temperature-controlled space 1. The air compression heat pump system includes a sixth switching device 600, which switches the connection of the outlet of the fifth flow path 23 between the expander 7 and the target temperature-controlled space 1. The control device is configured such that when the air compression heat pump system is in cooling mode, the control device controls the sixth switching device 600 to connect the outlet of the fifth flow path 23 to the expander 7. When the air compression heat pump system is in heating mode, the control device controls the third air passage 30 to disconnect, controls the third switching device 300 to connect the outlet of the first air passage 10 and the inlet of the second air passage 20 to the first connecting passage 50, controls the fifth switching device 500 to connect the third flow path 21 to the second compressor 5, and controls the sixth switching device 600 to connect the outlet of the fifth flow path 23 to the target temperature-controlled space 1.

[0074] refer to Figure 1 and Figure 2 The outlet of the fifth flow path 23 is provided with a ninth branch 27 and a tenth branch 28. The ninth branch 27 connects the outlet of the fifth flow path 23 to the target temperature control space 1, and the tenth branch 28 connects the outlet of the fifth flow path 23 to the expander 7. Among them, the ninth branch 27 is provided with a twelfth control valve 601, and the tenth branch 28 is provided with a thirteenth control valve 602. The sixth switching device 600 includes the twelfth control valve 601 and the thirteenth control valve 602.

[0075] When the air compression heat pump system is in cooling mode, the control device controls the twelfth control valve 601 of the sixth switching device 600 to close and the thirteenth control valve 602 to open. At this time, the outlet of the fifth flow path 23 is connected to the expander 7. The air flowing through the recovery heat exchanger 2 in the second air passage 20 enters the expander 7, expands and depressurizes, and then enters the target temperature regulation space 1.

[0076] When the air compression heat pump system is in the fourth heating mode, the control device controls the third air passage 30 to be disconnected. At this time, the first heat exchanger 4 and the second heat exchanger 6 do not perform heat exchange. The control device controls the sixth control valve 302 and the seventh control valve 303 of the third switching device 300 to be closed, controls the fifth control valve 301 to be opened, controls the eleventh control valve 501 of the fifth switching device 500 to be closed, controls the twelfth control valve 601 of the sixth switching device 600 to be opened, and controls the thirteenth control valve 602 to be closed. At this time, the outlet of the first air passage 10 and the inlet of the second air passage 20 are both connected to the first connecting passage 50. The outlet of the third flow path 21 is connected to the suction port of the second compressor 5 located on the fourth flow path 22. The fourth flow path 22 is connected to the fifth flow path 23. The outlet of the fifth flow path 23 is connected to the target temperature control space 1. Air from the target temperature-controlled space 1 is heated by the first heat recovery exchanger 2 in the first air passage 10, then compressed by the first compressor 3 in the third flow path 21, and further compressed by the second compressor 5 in the fourth flow path 22. Finally, it is heated by the heat recovery unit in the fifth flow path 23 and returned to the target temperature-controlled space 1. In this embodiment, by recovering heat from the target temperature-controlled space 1 and then heating it twice through the first compressor 3 and the second compressor before returning it to the target space, the temperature of the target space is increased, thus improving the heating efficiency.

[0077] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0078] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. An air compression heat pump system, characterized in that, The air compression heat pump system includes a recovery heat exchanger (2), a first heat exchanger (4), and a second heat exchanger (6); the air compression heat pump system also forms a first air passage (10), a second air passage (20), and a third air passage (30). The heat recovery heat exchanger (2) is used to realize heat exchange between the first air passage (10) and the second air passage (20); the first heat exchanger (4) and the second heat exchanger (6) are used to realize heat exchange between the second air passage (20) and the third air passage (30); The first air passage (10) is used to input air from the target temperature control space (1) into the recovery heat exchanger (2) for heat exchange, and input the heat-exchanged air into the second air passage (20) or discharge it to the outside environment; The second air passage (20) is used to sequentially input air from the first air passage (10) or from the external environment into the first heat exchanger (4), the second heat exchanger (6) and the recovery heat exchanger (2) for heat exchange, and input the heat-exchanged air into the target temperature control space (1) or discharge it into the external environment; The third air passage (30) is used to input air from the external environment into the first heat exchanger (4) and the second heat exchanger (6) for heat exchange, and to input the heat-exchanged air into the target temperature control space (1) or discharge it into the external environment; The second air passage (20) is equipped with a first compressor (3), a second compressor (5) and an expander (7); The first compressor (3) is located upstream of the first heat exchanger (4). Air from the first air passage (10) or from the external environment enters the first compressor (3), and after being compressed by the first compressor (3), it enters the first heat exchanger (4). The second compressor (5) is located between the first heat exchanger (4) and the second heat exchanger (6). Air from the first heat exchanger (4) enters the second compressor (5), and after being compressed by the second compressor (5), it enters the second heat exchanger (6). The expander (7) is located downstream of the recovery heat exchanger (2). Air from the recovery heat exchanger (2) enters the expander (7), expands and depressurizes after being expanded by the expander (7), and then enters the target temperature control space (1) or is discharged to the outside environment. The air compression heat pump system includes: The first switching device (100) is used to switch the outlet of the second air passage (20) between the target temperature control space (1) and the external environment; The second switching device (200) is used to switch the outlet of the third air passage (30) between the target temperature control space (1) and the external environment; The control device is configured such that: when the air compression heat pump system is in cooling mode, the control device controls the first switching device (100) to connect the outlet of the second air passage (20) to the target temperature control space (1), and controls the second switching device (200) to connect the outlet of the third air passage (30) to the external environment; when the air compression heat pump system is in heating mode, the control device controls the first switching device (100) to connect the outlet of the second air passage (20) to the external environment, and controls the second switching device (200) to connect the outlet of the third air passage (30) to the target temperature control space (1).

2. The air compression heat pump system according to claim 1, characterized in that, A first connection passage (50) is provided between the first air passage (10) and the second air passage (20), and the air compression heat pump system includes: The third switching device (300) is used to switch the outlet of the first air passage (10) between the first connection passage (50) and the external environment, and to switch the inlet of the second air passage (20) between the first connection passage (50) and the external environment. The control device is configured to: when the air compression heat pump system is in cooling mode, the control device controls the third switching device (300) to connect the outlet of the first air passage (10) and the inlet of the second air passage (20) to the first connecting passage (50) according to the different cooling modes of the air compression heat pump system; or, control the third switching device (300) to connect the outlet of the first air passage (10) and the inlet of the second air passage (20) to the external environment respectively; when the air compression heat pump system is in heating mode, the control device controls the third switching device (300) to connect the outlet of the first air passage (10) and the inlet of the second air passage (20) to the first connecting passage (50).

3. The air compression heat pump system according to claim 1, characterized in that, The third air passage (30) includes a first flow path (31) and a second flow path (32); the first flow path (31) flows through the first heat exchanger (4), and the second flow path (32) flows through the second heat exchanger (6); a second connecting passage (60) is provided between the first flow path (31) and the second flow path (32); the air compression heat pump system includes: The fourth switching device (400) is used to switch the outlet of the first flow path (31) between the second connection path (60) and the external environment, and to switch the inlet of the second flow path (32) between the second connection path (60) and the external environment. The control device is configured to: when the air compression heat pump system is in cooling mode, the control device controls the fourth switching device (400) to connect the outlet of the first flow path (31) and the inlet of the second flow path (32) to the second connecting passage (60) according to the different cooling modes of the air compression heat pump system; or, control the fourth switching device (400) to connect the outlet of the first flow path (31) and the inlet of the second flow path (32) to the external environment respectively; when the air compression heat pump system is in heating mode, the control device controls the fourth switching device (400) to connect the outlet of the first flow path (31) and the inlet of the second flow path (32) to the second connecting passage (60).

4. An air compression heat pump system according to claim 2, characterized in that, The second air passage (20) includes a third flow path (21) and a fourth flow path (22). The third flow path (21) flows through the first heat exchanger (4), and the first compressor (3) is disposed on the third flow path (21). The fourth flow path (22) flows through the second heat exchanger (6), and the second compressor (5) is disposed on the fourth flow path (22). The air compression heat pump system also includes a fourth air passage (40). Air in the third flow path (21) flows to the second compressor (5) or the fourth air passage (40). The outlet of the fourth air passage (40) is connected to the outlet of the second air passage (20). The air compression heat pump system also includes: The fifth switching device (500) is used to switch the outlet of the third flow path (21) between the intake port of the second compressor (5) and the inlet of the fourth air passage (40); The control device is configured such that when the air compression heat pump system is in cooling mode, the control device controls the fifth switching device (500) to connect the outlet of the third flow path (21) to the intake port of the second compressor (5); when the air compression heat pump system is in the second heating mode, the control device controls the third air passage (30) and the fourth flow path (22) to disconnect, controls the first switching device (100) to connect the outlet of the second air passage (20) to the target temperature control space (1), controls the third switching device (300) to connect the outlet of the first air passage (10) and the inlet of the second air passage (20) to the first connecting passage (50), and controls the fifth switching device (500) to connect the outlet of the third flow path (21) to the inlet of the fourth air passage (40).

5. An air compression heat pump system according to claim 4, characterized in that, When the air compression heat pump system is in the third heating mode, the control device is configured to: disconnect the first air passage (10), the third air passage (30) and the fourth flow path (22), control the first switching device (100) to connect the outlet of the second air passage (20) to the target temperature control space (1), control the third switching device (300) to connect the inlet of the second air passage (20) to the external environment, and control the fifth switching device (500) to connect the outlet of the third flow path (21) to the inlet of the fourth air passage (40).

6. An air compression heat pump system according to claim 4, characterized in that, The second air passage (20) includes a fifth flow path (23) that flows through the recovery heat exchanger (2) and whose outlet flows to the expander (7) or the target temperature control space (1); the air compression heat pump system includes: The sixth switching device (600) is used to switch the outlet of the fifth flow path (23) between the expander (7) and the target temperature control space (1); The control device is configured such that: when the air compression heat pump system is in cooling mode, the control device controls the sixth switching device (600) to connect the outlet of the fifth flow path (23) to the expander (7); when the air compression heat pump system is in the fourth heating mode, the control device controls the third air passage (30) to disconnect, controls the third switching device (300) to connect the outlet of the first air passage (10) and the inlet of the second air passage (20) to the first connecting passage (50), controls the fifth switching device (500) to connect the outlet of the third flow path (21) to the suction port of the second compressor (5), and controls the sixth switching device (600) to connect the outlet of the fifth flow path (23) to the target temperature control space (1).

7. An air compression heat pump system according to any one of claims 2-6, characterized in that, The second compressor (5) and the expander (7) are coaxially connected.

8. An air compression heat pump system according to any one of claims 2-6, characterized in that, The second compressor (5) and the expander (7) are set up independently, and the air compression heat pump system also includes an energy storage device (8). When the air compression heat pump system is running during off-peak electricity hours, the energy storage device (8) converts the kinetic energy generated by the expander (7) into electrical energy for storage. When the air compression heat pump system is operating during peak electricity consumption periods, the energy storage device (8) supplies power to the first compressor and / or the second compressor (5).

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