Jet enthalpy-increasing heat pump system and control method thereof

Abstract

The present invention proposes a jet reheat heat pump system and a control method thereof, wherein the jet reheat heat pump system includes a first intermediate heat exchanger, a second intermediate heat exchanger and a vortex tube; the refrigerant main circuit includes a first heat exchange main section and a second heat exchange main section; the inlet of the vortex tube is connected to the economizer, the cold end outlet of the vortex tube is connected to the jet reheat port of the compressor through the first cold fluid branch or the second cold fluid branch, and the hot end outlet of the vortex tube is connected to the jet reheat port of the compressor through the hot fluid branch; wherein the first cold fluid branch includes a first heat exchange auxiliary section that flows through the first intermediate heat exchanger and performs heat exchange with the first heat exchange main section, and the second cold fluid branch includes a second heat exchange auxiliary section that flows through the second intermediate heat exchanger and performs heat exchange with the second heat exchange main section; the present invention can fully utilize the energy of the jet reheat circuit and enhance the cooling and heating capabilities of the system.

Description

Technical Field

[0001] The present invention belongs to the technical field of heat pump systems, and more particularly, relates to an air jet enthalpy-increasing heat pump system and a control method thereof. Background Art

[0002] Currently, air conditioning units experience varying degrees of cooling or heating capacity degradation when exposed to large temperature differences between indoor and outdoor environments. To alleviate this problem, the industry generally employs technologies such as hot gas bypass, refrigerant heat storage, and jet reheating to improve cooling or heating performance. For example, a jet reheating heat pump system primarily consists of a jet reheating compressor, an indoor heat exchanger, an outdoor heat exchanger, a four-way valve, an economizer, and the piping connecting these components. However, existing jet reheating heat pump systems still have limitations in improving cooling and heating capacity and struggle to adapt to a wider range of indoor and outdoor temperature differences. Summary of the Invention

[0003] The present invention aims to provide an air jet enthalpy increase heat pump system and a control method thereof, aiming to improve the cooling and heating performance under conditions of a large indoor and outdoor temperature difference.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] The present invention provides an air jet enthalpy increase heat pump system, comprising a compressor, a four-way valve, an indoor heat exchanger, an economizer, and an outdoor heat exchanger connected to form a refrigerant main circuit, and further comprising a first intermediate heat exchanger, a second intermediate heat exchanger, and a vortex tube;

[0006] The refrigerant main circuit includes a first heat exchange main section located between the indoor heat exchanger and the economizer and flowing through the first intermediate heat exchanger, and a second heat exchange main section located between the economizer and the outdoor heat exchanger and flowing through the second intermediate heat exchanger;

[0007] The inlet of the vortex tube is connected to the economizer, the cold end outlet of the vortex tube is connected to the jet enthalpy increase port of the compressor through the first cold fluid branch or the second cold fluid branch, and the hot end outlet of the vortex tube is connected to the jet enthalpy increase port of the compressor through the hot fluid branch;

[0008] The first cold fluid branch includes a first heat exchange auxiliary section flowing through the first intermediate heat exchanger and performing heat exchange with the first heat exchange main section, and the second cold fluid branch includes a second heat exchange auxiliary section flowing through the second intermediate heat exchanger and performing heat exchange with the second heat exchange main section.

[0009] Furthermore, it also includes a gas-liquid separator and a third intermediate heat exchanger. The refrigerant main circuit also includes a third heat exchange main section located between the gas-liquid separator and the air intake of the compressor and flowing through the third intermediate heat exchanger. The hot fluid branch includes a third heat exchange auxiliary section flowing through the third intermediate heat exchanger and performing heat exchange with the third heat exchange main section.

[0010] Furthermore, the first cold fluid branch or the second cold fluid branch merges with the hot fluid branch to form a merged branch, which is then connected to the injection enthalpy increase port of the compressor.

[0011] Furthermore, a one-way valve is provided on the merging branch.

[0012] Furthermore, the first cold fluid branch, the second cold fluid branch and the hot fluid branch are each provided with a control valve for controlling their own on-off states.

[0013] Furthermore, the cold end outlet and the hot end outlet of the vortex tube are respectively provided with a flow regulating valve.

[0014] Furthermore, the first intermediate heat exchanger, the second intermediate heat exchanger and the third intermediate heat exchanger are all plate heat exchangers or shell and tube heat exchangers.

[0015] Furthermore, the first inlet of the economizer is connected between the first intermediate heat exchanger and the second intermediate heat exchanger through a main branch, the first outlet of the economizer is connected between the first intermediate heat exchanger and the second intermediate heat exchanger through a first branch branch, the first outlet of the economizer is connected to the second inlet of the economizer through a second branch branch, and the second outlet of the economizer is connected to the inlet of the vortex tube through an auxiliary branch.

[0016] Furthermore, a main throttle valve is provided on the first shunt branch, and an auxiliary throttle valve is provided on the second shunt branch.

[0017] The present invention further provides a control method for a jet enthalpy-increasing heat pump system. The jet enthalpy-increasing heat pump system adopts the jet enthalpy-increasing heat pump system as described above. The control method for the jet enthalpy-increasing heat pump system includes:

[0018] Obtaining an operating mode of the jet enthalpy heat pump system, wherein the operating mode includes a cooling mode and a heating mode;

[0019] controlling the on / off states of the first cold fluid branch, the second cold fluid branch, and the hot fluid branch according to the working mode;

[0020] The flow rate of the hot end outlet of the vortex tube is adjusted according to the comparison result between the measured suction temperature of the compressor and the target suction temperature.

[0021] Compared to existing technologies, the proposed jet-increase heat pump system and its control method offer the following advantages: By leveraging the vortex effect of the vortex tube, the proposed system fully utilizes the energy of the jet-increase circuit, effectively increasing the condenser outlet subcooling. This not only enhances the system's cooling and heating capabilities but also improves its energy efficiency, enabling it to better adapt to a wider range of indoor and outdoor temperature differences. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 The principle of the jet enthalpy increase heat pump system proposed in the preferred embodiment of the present invention Figure 1 ;

[0024] Figure 2 The principle of the jet enthalpy increase heat pump system proposed in the preferred embodiment of the present invention Figure 2 ;

[0025] Figure 3 The principle of the jet enthalpy increase heat pump system proposed in the preferred embodiment of the present invention Figure 3 ;

[0026] Figure 4 The principle of the jet enthalpy increase heat pump system proposed in the preferred embodiment of the present invention Figure 4 ;

[0027] Figure 5 A schematic diagram of an economizer proposed in a preferred embodiment of the present invention;

[0028] Figure 6 A schematic diagram of a vortex tube proposed in a preferred embodiment of the present invention;

[0029] Figure 7 A schematic diagram of a four-way valve proposed in a preferred embodiment of the present invention;

[0030] Figure 8 Schematic diagram of the control method of the jet enthalpy increase heat pump system proposed in the preferred embodiment of the present invention Figure 1 ;

[0031] Figure 9 Schematic diagram of the control method of the jet enthalpy increase heat pump system proposed in the preferred embodiment of the present invention Figure 2 ;

[0032] Among them, the main marks of the drawings in the figure are:

[0033] 1. Compressor; 3. Indoor heat exchanger; 4. First intermediate heat exchanger; 9. Second intermediate heat exchanger; 12. Third intermediate heat exchanger; 7. Main throttle valve; 8. Auxiliary throttle valve; 10. Outdoor heat exchanger; 11. Gas-liquid separator;

[0034] 13. First control valve; 14. Second control valve; 15. Third control valve;

[0035] 16. First one-way valve; 17. Second one-way valve; 18. Third one-way valve; 19. Fourth one-way valve; 20. Fifth one-way valve;

[0036] 2. Four-way valve; 21. First interface; 22. Second interface; 23. Third interface; 24. Fourth interface;

[0037] 5. Economizer; 51. First inlet; 52. First outlet; 53. Second inlet; 54. Second outlet;

[0038] 6. Vortex tube; 61. Inlet; 62. Cold end outlet; 63. Hot end outlet;

[0039] 101. First cold fluid branch; 102. Second cold fluid branch; 103. Hot fluid branch; 104. Main branch; 105. First shunt branch; 106. Second shunt branch; 107. Auxiliary branch. DETAILED DESCRIPTION

[0040] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0041] At present, when the temperature difference between indoor and outdoor is large, the cooling or heating capacity of air-conditioning products will decrease to varying degrees. To solve this problem, the industry usually adopts technical means such as hot gas bypass, refrigerant heat storage, and jet reheat to enhance the cooling or heating performance. Taking the jet reheat heat pump system as an example, the system is mainly composed of a jet reheat compressor, an indoor heat exchanger, an outdoor heat exchanger, a four-way valve, an economizer, and pipes connecting the various components. However, the existing jet reheat heat pump system still has certain limitations in improving the cooling and heating performance, and it is difficult to fully adapt to a wider range of indoor and outdoor temperature difference environments. Based on this, the present invention proposes a new jet reheat heat pump system and its control method, which aims to further improve the cooling and heating performance under conditions of large indoor and outdoor temperature differences.

[0042] Please also refer to Figures 1 to 4 、 Figure 6The jet-increased heat pump system proposed in a preferred embodiment of the present invention primarily comprises the following components connected to form a refrigerant main circuit: a compressor 1, a four-way valve 2, an indoor heat exchanger 3, an economizer 5, and an outdoor heat exchanger 10. Furthermore, the jet-increased heat pump system also includes a first intermediate heat exchanger 4, a second intermediate heat exchanger 9, and a vortex tube 6.

[0043] The refrigerant main circuit includes a first heat exchange main section located between the indoor heat exchanger 3 and the economizer 5 and flowing through the first intermediate heat exchanger 4, and a second heat exchange main section located between the economizer 5 and the outdoor heat exchanger 10 and flowing through the second intermediate heat exchanger 9;

[0044] The inlet 61 of the vortex tube 6 is connected to the economizer 5, the cold end outlet 62 of the vortex tube 6 is connected to the jet enthalpy increase port of the compressor 1 through the first cold fluid branch 101 or the second cold fluid branch 102, and the hot end outlet 63 of the vortex tube 6 is connected to the jet enthalpy increase port of the compressor 1 through the hot fluid branch 103;

[0045] Among them, the first cold fluid branch 101 includes a first heat exchange auxiliary section that flows through the first intermediate heat exchanger 4 and performs heat exchange with the first heat exchange main section, and the second cold fluid branch 102 includes a second heat exchange auxiliary section that flows through the second intermediate heat exchanger 9 and performs heat exchange with the second heat exchange main section.

[0046] In this jet enthalpy heat pump system, the vortex effect of the vortex tube 6 is used to separate the fluid from the economizer 5 into cold and hot fluids. The cold fluid is discharged from the cold end outlet 62 of the vortex tube 6, while the hot fluid is discharged from the hot end outlet 63.

[0047] When the jet-increased enthalpy heat pump system is in heating mode, the cold fluid discharged from the cold end of vortex tube 6 flows through first cold fluid branch 101, passes through first intermediate heat exchanger 4, and then enters compressor 1. During this process, the first heat exchange auxiliary section of first cold fluid branch 101 and the first heat exchange main section of the refrigerant main circuit exchange heat within first intermediate heat exchanger 4. This process increases the subcooling of the fluid at the outlet of indoor heat exchanger 3, thereby improving the heating energy efficiency of the entire system.

[0048] When the jet-increased enthalpy heat pump system is in cooling mode, the cold fluid discharged from the cold end of vortex tube 6 flows through second cold fluid branch 102, passes through second intermediate heat exchanger 9, and then enters compressor 1. During this process, the second heat exchange auxiliary section of second cold fluid branch 102 and the second heat exchange main section of the refrigerant main circuit exchange heat within second intermediate heat exchanger 9. This process increases the subcooling degree of the fluid at the outlet of outdoor heat exchanger 10, thereby improving the cooling energy efficiency of the entire system.

[0049] It should be noted that when the jet enthalpy heat pump system is in heating mode, the indoor heat exchanger 3 operates as a condenser, while the outdoor heat exchanger 10 operates as an evaporator. Conversely, when the jet enthalpy heat pump system is in cooling mode, the indoor heat exchanger 3 operates as an evaporator, while the outdoor heat exchanger 10 operates as a condenser.

[0050] Furthermore, regardless of whether the jet-injection heat pump system is in heating mode or cooling mode, the hot fluid discharged from the hot end of the vortex tube 6 enters the compressor 1 through the hot fluid branch 103. In the heating mode, the hot fluid branch 103 forms a jet-injection circuit with the first cold fluid branch 101; in the cooling mode, the hot fluid branch 103 forms a jet-injection circuit with the second cold fluid branch 102.

[0051] Therefore, the proposed jet-injection heat pump system fully utilizes the energy of the jet-injection circuit, effectively increasing the condenser outlet subcooling. This not only enhances the system's cooling and heating capabilities but also improves its energy efficiency, enabling it to better adapt to a wider range of indoor and outdoor temperature differences. The system's performance is significantly improved under high-temperature cooling and low-temperature heating conditions.

[0052] In a preferred embodiment of the present invention, Figure 2 As shown, the jet-increased heat pump system also includes a gas-liquid separator 11 and a third intermediate heat exchanger 12. The refrigerant main circuit also includes a third main heat exchange section located between the gas-liquid separator 11 and the intake port of the compressor 1 and flowing through the third intermediate heat exchanger 12. The hot fluid branch 103 includes a third auxiliary heat exchange section that flows through the third intermediate heat exchanger 12 and exchanges heat with the third main heat exchange section. In addition, the intake port of the compressor 1 is equipped with an intake temperature sensor to detect the intake port temperature.

[0053] In this jet-increased enthalpy heat pump system, the hot fluid discharged from the hot end of vortex tube 6 flows through hot fluid branch 103, passes through third intermediate heat exchanger 12, and then enters compressor 1. During this process, the third heat exchange auxiliary section of hot fluid branch 103 and the third heat exchange main section of the refrigerant main circuit exchange heat within third intermediate heat exchanger 12. This process effectively increases the superheat of the fluid at the outlet of gas-liquid separator 11, thereby reducing the risk of liquid carryover in compressor 1.

[0054] In a preferred embodiment of the present invention, Figure 2 As shown, the first cold fluid branch 101 or the second cold fluid branch 102 merges with the hot fluid branch 103 to form a merged branch, which is then connected to the injection enthalpy increase port of the compressor 1.

[0055] In this jet enthalpy heat pump system, when the system is in heating mode, the first cold fluid branch 101 flows through the first intermediate heat exchanger 4, while the hot fluid branch 103 flows through the third intermediate heat exchanger 12. At this time, the fluids of the first cold fluid branch 101 and the hot fluid branch 103 mix and then enter the compressor 1. This process can effectively reduce the risk of liquid carryover in the jet enthalpy heat pump circuit of the compressor 1. When the system switches to cooling mode, the second cold fluid branch 102 flows through the second intermediate heat exchanger 9, while the hot fluid branch 103 flows through the third intermediate heat exchanger 12. At this time, the fluids of the second cold fluid branch 102 and the hot fluid branch 103 mix and then enter the compressor 1, which can also effectively reduce the risk of liquid carryover in the jet enthalpy heat pump circuit of the compressor 1.

[0056] In a preferred embodiment of the present invention, Figure 2 As shown, a one-way valve, namely, a first one-way valve 16, is provided on the merging branch.

[0057] The check valve ensures that fluid can flow in only one direction, preventing backflow and system instability or damage. When the jet-increased heat pump system is operating in heating or cooling mode, the check valve ensures that fluid in the confluence branch flows smoothly into compressor 1, preventing backflow that could disrupt normal system operation. This design further enhances the stability and reliability of the jet-increased heat pump system and optimizes its overall performance.

[0058] In a preferred embodiment of the present invention, Figure 2 As shown, the first cold fluid branch 101, the second cold fluid branch 102, and the hot fluid branch 103 are each equipped with a control valve for controlling their respective on / off states. Specifically, the first cold fluid branch 101 is equipped with a first control valve 13, the second cold fluid branch 102 is equipped with a second control valve 14, and the hot fluid branch 103 is equipped with a third control valve 15. The first control valve 13, the second control valve 14, and the third control valve 15 can all be solenoid valves.

[0059] The setting of these control valves enables the system to flexibly adjust the on-off status of each branch according to actual needs, thereby achieving more precise control of the jet enthalpy increase heat pump system. In the heating mode, the first control valve 13 and the third control valve 15 are opened, allowing the fluid of the first cold fluid branch 101 and the hot fluid branch 103 to enter the compressor 1, forming a jet enthalpy increase loop. During this process, the second control valve 14 remains closed to prevent the fluid of the second cold fluid branch 102 from interfering with the heating effect. In the cooling mode, the second control valve 14 and the third control valve 15 are opened, allowing the fluid of the second cold fluid branch 102 and the hot fluid branch 103 to enter the compressor 1, forming a jet enthalpy increase loop. During this process, the first control valve 13 remains closed to prevent the fluid of the first cold fluid branch 101 from interfering with the cooling effect.

[0060] In a preferred embodiment of the present invention, the cold end outlet 62 and the hot end outlet 63 of the vortex tube 6 are respectively provided with a flow regulating valve, which can be a stepless proportional regulating valve to achieve precise control of the fluid flow at each outlet.

[0061] The presence of these flow control valves further enhances the system's flexibility and control precision. By adjusting the flow rates of the fluid discharged from the cold and hot ends of vortex tube 6, the system can more accurately control the ratio of cold to hot fluid flowing to the jet reheating port of compressor 1, effectively reducing the risk of liquid carryover in compressor 1's suction and in the jet reheating circuit.

[0062] In a preferred embodiment of the present invention, the first intermediate heat exchanger 4, the second intermediate heat exchanger 9 and the third intermediate heat exchanger 12 are all plate heat exchangers or shell-and-tube heat exchangers.

[0063] Both plate and tube heat exchangers offer excellent heat exchange performance, enabling efficient and rapid heat transfer between two fluids. While both offer similar performance in terms of efficient heat exchange and compact design, plate heat exchangers excel in heat transfer efficiency, structural flexibility, and lightweight design, while tube heat exchangers offer significant advantages in pressure resistance, seismic resistance, and media compatibility. In practical applications, the choice of heat exchanger requires a comprehensive consideration of specific operating conditions, such as fluid properties, space constraints, and maintenance requirements.

[0064] In addition, the indoor heat exchanger 3 can be a fin-tube heat exchanger, a plate heat exchanger, a shell-and-tube heat exchanger, etc., the outdoor heat exchanger 10 can be a fin-tube heat exchanger, etc., and the economizer 5 can be a plate heat exchanger or a shell-and-tube heat exchanger, etc.

[0065] In a preferred embodiment of the present invention, Figure 2 、 Figure 5 、 Figure 6 As shown, the first inlet 51 of the economizer 5 is connected between the first intermediate heat exchanger 4 and the second intermediate heat exchanger 9 through the main branch 104, the first outlet 52 of the economizer 5 is connected between the first intermediate heat exchanger 4 and the second intermediate heat exchanger 9 through the first branch branch 105, the first outlet 52 of the economizer 5 is connected to the second inlet 53 of the economizer 5 through the second branch branch 106, and the second outlet 54 of the economizer 5 is connected to the inlet 61 of the vortex tube 6 through the auxiliary branch 107.

[0066] In this jet-increment heat pump system, when the system is in heating mode, the refrigerant (also called refrigerant) flowing out of the indoor heat exchanger 3 first flows through the first intermediate heat exchanger 4 before entering the first inlet 51 of the economizer 5. The refrigerant flowing out of the first outlet 52 of the economizer 5 is split into two paths: one path flows through the first branch 105 to the second intermediate heat exchanger 9, and the other path flows through the second branch 106 to the second inlet 53 of the economizer 5, then flows out through the second outlet 54 and enters the vortex tube 6 through the auxiliary branch 107. When the system is in cooling mode, the refrigerant flowing out of the outdoor heat exchanger 10 first flows through the second intermediate heat exchanger 9 before entering the first inlet 51 of the economizer 5. The refrigerant flowing out of the first outlet 52 of the economizer 5 is similarly divided into two paths: one path flows to the first intermediate heat exchanger 4 through the first diversion branch 105, and the other path flows into the second inlet 53 of the economizer 5 through the second diversion branch 106. The other path then flows out through the second outlet 54 and into the vortex tube 6 through the auxiliary branch 107. The design of the economizer 5 ensures an efficient and stable connection between the main refrigerant circuit and the vortex tube 6, thereby ensuring the operating efficiency and reliability of the entire system. The vortex effect of the vortex tube 6 effectively utilizes the energy of the injection enthalpy increase circuit, avoiding energy waste and significantly improving the energy efficiency of the entire unit.

[0067] In a preferred embodiment of the present invention, Figure 2 As shown, a main throttle valve 7 is provided on the first branch 105, and an auxiliary throttle valve 8 is provided on the second branch 106. Both the main throttle valve 7 and the auxiliary throttle valve 8 can be electronic expansion valves.

[0068] The coordinated configuration of the main throttle valve 7 and the auxiliary throttle valve 8 enables the system to flexibly adjust the refrigerant flow rate according to operating conditions, thereby further optimizing overall performance. The main throttle valve 7 is responsible for regulating and controlling the refrigerant flow from the economizer 5 to the first intermediate heat exchanger 4 or the second intermediate heat exchanger 9, ensuring efficient heat exchange in the intermediate heat exchangers. Simultaneously, the auxiliary throttle valve 8 is responsible for regulating and controlling the refrigerant flow returning to the economizer 5 to maintain stable pressure within the economizer 5. The coordinated operation of the main throttle valve 7 and the auxiliary throttle valve 8 enhances the system's reliability and adaptability, enabling it to maintain optimal operation under a variety of operating conditions.

[0069] Based on the detailed introduction of the jet enthalpy heat pump system above, its control method will be briefly described below.

[0070] Please also refer to Figure 8 The control method of the jet enthalpy increase heat pump system includes the following steps:

[0071] Obtaining an operating mode of the jet enthalpy heat pump system, wherein the operating mode includes a cooling mode and a heating mode;

[0072] Controlling the on / off states of the first cold fluid branch, the second cold fluid branch, and the hot fluid branch according to the working mode;

[0073] The flow rate at the hot end outlet of the vortex tube is adjusted according to the comparison result between the measured suction temperature of the compressor and the target suction temperature.

[0074] like Figure 9 As shown in the figure, in actual application, after the jet enthalpy heat pump system is started, it first identifies the operating mode selected by the user. If heating mode is selected, the first and third control valves open, while the second control valve closes. If cooling mode is selected, the second and third control valves open, while the first control valve closes. The system monitors the compressor's suction temperature in real time and compares it with a preset target value. Based on the comparison result, it adjusts the opening of the flow control valve at the vortex tube hot-end outlet, thereby achieving precise control of the vortex tube hot-end outlet flow rate. The specific adjustment strategy is as follows: when the measured suction temperature exceeds the target suction temperature + the deviation value, the flow rate at the vortex tube hot-end outlet is reduced; when the measured suction temperature is less than the target suction temperature - the deviation value, the flow rate at the vortex tube hot-end outlet is increased; when the target suction temperature - the deviation value is less than the measured suction temperature, and the measured suction temperature is less than the target suction temperature + the deviation value, the flow rate at the vortex tube hot-end outlet remains unchanged.

[0075] This invention significantly improves both cooling and heating performance by incorporating a vortex tube into a jet-increased heat pump system. The system dynamically adjusts the flow rate at the hot-end outlet of the vortex tube based on the difference between the compressor's measured intake temperature and the target intake temperature, effectively reducing the risk of liquid carryover in the compressor intake air. This improvement not only effectively protects the compressor but also significantly enhances system reliability.

[0076] In order to more fully understand the present invention, the structure of the jet enthalpy increase heat pump system will be described in detail below with reference to the accompanying drawings.

[0077] like Figure 2 、 Figures 5 to 7 As shown, the jet enthalpy heat pump system mainly consists of the following components: a compressor 1, a four-way valve 2, an indoor heat exchanger 3, an intermediate heat exchanger, an economizer 5, a vortex tube 6, a main throttle valve 7, an auxiliary throttle valve 8, an outdoor heat exchanger 10, a gas-liquid separator 11, a first control valve 13, a second control valve 14, a third control valve 15, a first check valve 16, a second check valve 17, a third check valve 18, a fourth check valve 19, and a fifth check valve 20. The economizer 5 has a first inlet 51, a first outlet 52, a second inlet 53, and a second outlet 54; the vortex tube 6 has an inlet 61, a cold-end outlet 62, and a hot-end outlet 63; and the four-way valve 2 has a first port 21, a second port 22, a third port 23, and a fourth port 24.

[0078] like Figure 2 、 Figure 3 As shown in the figure, when the jet enthalpy heat pump system is in heating mode:

[0079] First, the high-temperature and high-pressure gaseous refrigerant passes through the compressor 1 and enters the first port 21 of the four-way valve 2. It then flows out from the second port 22 and enters the indoor heat exchanger 3.

[0080] Then, the refrigerant flows out of the indoor heat exchanger 3, passes through the first intermediate heat exchanger 4, passes through the second one-way valve 17, enters the first inlet 51 of the economizer 5, and flows out of the first outlet 52, and is divided into two.

[0081] One refrigerant path passes through the main throttle valve 7, flows through the fifth one-way valve 20 and the second intermediate heat exchanger 9, and then enters the outdoor heat exchanger 10. After flowing out of the outdoor heat exchanger 10, it enters the fourth port 24 of the four-way valve 2, flows out from the third port 23, passes through the gas-liquid separator 11 and the third intermediate heat exchanger 12, and then enters the suction port of the compressor 1.

[0082] The other refrigerant flows through the auxiliary throttle valve 8 into the second inlet 53 of the economizer 5, flows out of the second outlet 54 and enters the inlet 61 of the vortex tube 6. The fluid entering the vortex tube 6 is divided into two; the cold fluid flows out of the cold end outlet 62 through the first control valve 13 and enters the first intermediate heat exchanger 4; the hot fluid flows out of the hot end outlet 63 through the third control valve 15 and enters the third intermediate heat exchanger 12.

[0083] Finally, the refrigerants after heat exchange in the first intermediate heat exchanger 4 and the third intermediate heat exchanger 12 are mixed and then pass through the first one-way valve 16 to enter the injection enthalpy increase port of the compressor 1, completing the auxiliary circuit compression cycle.

[0084] like Figure 2 、 Figure 4 As shown in the figure, when the jet enthalpy heat pump system is in cooling mode:

[0085] First, the high-temperature and high-pressure gaseous refrigerant passes through the compressor 1 and enters the first port 21 of the four-way valve 2, then flows out from the fourth port 24 and enters the outdoor heat exchanger 10;

[0086] Secondly, the refrigerant flows out of the indoor heat exchanger 3, passes through the second intermediate heat exchanger 9, passes through the fourth one-way valve 19, enters the first inlet 51 of the economizer 5, and flows out of the first outlet 52 and is divided into two;

[0087] One path of refrigerant passes through the main throttle valve 7, flows through the third one-way valve 18 and the first intermediate heat exchanger 4, and then enters the indoor heat exchanger 3. After flowing out of the indoor heat exchanger 3, it enters the second interface 22 of the four-way valve 2, flows out from the third interface 23, passes through the gas-liquid separator 11 and the third intermediate heat exchanger 12, and enters the intake port of the compressor 1, completing the main compression cycle.

[0088] The other refrigerant flows through the auxiliary throttle valve 8 into the fourth port 24 of the economizer 5, flows out of the third port 23, and enters the inlet 61 of the vortex tube 6. The fluid entering the vortex tube 6 is split into two; the cold fluid flows out of the cold end outlet 62 through the second control valve 14 and enters the second intermediate heat exchanger 9; the hot fluid flows out of the hot end outlet 63 through the third control valve 15 and enters the third intermediate heat exchanger 12.

[0089] Finally, the refrigerants after heat exchange in the second intermediate heat exchanger 9 and the third intermediate heat exchanger 12 are mixed and then pass through the first one-way valve 16 to enter the injection enthalpy increase port of the compressor 1, completing the auxiliary circuit compression cycle.

[0090] The present invention proposes a jet reheat heat pump system with a vortex tube, which is a quasi-two-stage compression system with an intermediate air supply compressor. The vortex effect generated by the vortex tube enables the system to maximize the energy utilization efficiency of the jet reheat circuit. By efficiently utilizing the energy of the jet reheat circuit, the system not only improves the subcooling degree at the condenser outlet and the superheat degree at the compressor intake, but also effectively reduces the risk of liquid carryover in the compressor intake and liquid carryover in the reheat circuit, thereby significantly enhancing the system's cooling and heating performance, improving the operating energy efficiency ratio, and ensuring that the system can still operate stably under conditions with large indoor and outdoor temperature differences.

[0091] In the description of the present invention, it should be understood that, unless otherwise expressly specified or limited, when an element is referred to as being “fixed to” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0092] In addition, the orientations or positional relationships indicated by terms such as “center”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0093] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0094] Furthermore, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0095] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A jet enthalpy increase heat pump system, comprising a compressor, a four-way valve, an indoor heat exchanger, an economizer, and an outdoor heat exchanger connected to form a refrigerant main circuit, characterized in that: It also includes a first intermediate heat exchanger, a second intermediate heat exchanger and a vortex tube; The refrigerant main circuit includes a first heat exchange main section located between the indoor heat exchanger and the economizer and flowing through the first intermediate heat exchanger, and a second heat exchange main section located between the economizer and the outdoor heat exchanger and flowing through the second intermediate heat exchanger; The inlet of the vortex tube is connected to the outlet of the economizer, the cold end outlet of the vortex tube is connected to the jet enthalpy increase port of the compressor through the first cold fluid branch or the second cold fluid branch, and the hot end outlet of the vortex tube is connected to the jet enthalpy increase port of the compressor through the hot fluid branch; The first cold fluid branch includes a first heat exchange auxiliary section that flows through the first intermediate heat exchanger and performs heat exchange with the first heat exchange main section, and the second cold fluid branch includes a second heat exchange auxiliary section that flows through the second intermediate heat exchanger and performs heat exchange with the second heat exchange main section. It also includes a gas-liquid separator and a third intermediate heat exchanger. The refrigerant main circuit also includes a third heat exchange main section located between the gas-liquid separator and the air intake of the compressor and flowing through the third intermediate heat exchanger. The hot fluid branch includes a third heat exchange auxiliary section flowing through the third intermediate heat exchanger and performing heat exchange with the third heat exchange main section.

2. The jet enthalpy increase heat pump system according to claim 1, characterized in that: The first cold fluid branch or the second cold fluid branch merges with the hot fluid branch to form a merged branch, which is then communicated with the injection enthalpy increase port of the compressor.

3. The jet enthalpy increase heat pump system according to claim 2, characterized in that: A one-way valve is provided on the merging branch.

4. The jet enthalpy increase heat pump system according to claim 1, characterized in that: The first cold fluid branch, the second cold fluid branch and the hot fluid branch are all provided with control valves for controlling their own on-off states.

5. The jet enthalpy increase heat pump system according to claim 1, characterized in that: The cold end outlet and the hot end outlet of the vortex tube are respectively provided with a flow regulating valve.

6. The jet enthalpy increase heat pump system according to claim 1, characterized in that: The first intermediate heat exchanger, the second intermediate heat exchanger and the third intermediate heat exchanger are all plate heat exchangers or shell and tube heat exchangers.

7. The jet enthalpy increase heat pump system according to claim 1, characterized in that: The first inlet of the economizer is connected between the first intermediate heat exchanger and the second intermediate heat exchanger through a main branch, the first outlet of the economizer is connected between the first intermediate heat exchanger and the second intermediate heat exchanger through a first branch branch, the first outlet of the economizer is connected to the second inlet of the economizer through a second branch branch, and the second outlet of the economizer is connected to the inlet of the vortex tube through an auxiliary branch.

8. The jet enthalpy increase heat pump system according to claim 7, characterized in that: The first branch flow path is provided with a main throttle valve, and the second branch flow path is provided with an auxiliary throttle valve.

9. A control method for an air jet enthalpy increase heat pump system, characterized in that: The jet enthalpy-increasing heat pump system adopts the jet enthalpy-increasing heat pump system according to any one of claims 1 to 8, and the control method of the jet enthalpy-increasing heat pump system includes: Obtaining an operating mode of the jet enthalpy heat pump system, wherein the operating mode includes a cooling mode and a heating mode; controlling the on / off states of the first cold fluid branch, the second cold fluid branch, and the hot fluid branch according to the working mode; The flow rate of the hot end outlet of the vortex tube is adjusted according to the comparison result between the measured suction temperature of the compressor and the target suction temperature.

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