Enhanced vapor injection air conditioning system

Abstract

The utility model belongs to the technical field of air conditioners, and discloses an enhanced vapor injection air conditioning system which comprises a compressor, an oil separator, a four-way valve, a heat exchange assembly, a first economizer, a second economizer and a gas-liquid separator. The four-way valve is connected with the oil separator; a pipe C of the four-way valve is connected with the outdoor heat exchange unit, and a pipe E of the four-way valve is connected with the indoor heat exchange unit; the outdoor expansion valve and the indoor expansion valve are both connected with the first economizer; the second economizer is connected with the first economizer, an oil return opening of the oil separator is connected with the second economizer, and the second economizer is connected with an air suction opening and an air jet opening of the compressor. Therefore, the oil separator can convey high-temperature lubricating oil to the second economizer, so that the lubricating oil exchanges heat with the second economizer, a preheated refrigerant is sprayed into the compressor through the air nozzle of the compressor, the enhanced vapor injection efficiency is improved, the liquid return risk is avoided, and the service life of the compressor is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, in particular to an ejector enthalpy-increasing air conditioning system. Background Technique

[0002] An air conditioner is a device used to adjust the indoor environmental temperature, humidity, and air quality. With the development of technology, the ejector enthalpy-increasing technology has emerged. The ejector enthalpy-increasing air conditioning system can have a better heating effect in a low-temperature environment and improve the COP (Coefficient of Performance, the cooling or heating capacity obtained per unit energy consumption).

[0003] The ejector enthalpy-increasing air conditioning system includes an ejector enthalpy-increasing compressor, an indoor heat exchanger, an outdoor heat exchanger, and a four-way reversing valve that are connected through pipes to form a loop. By controlling the flow direction of the refrigerant through the four-way reversing valve, the indoor heat exchanger can be switched between refrigeration and heating; compared with a traditional compressor, the ejector enthalpy-increasing compressor is provided with an ejector port, so that a part of the refrigerant vapor introduced into the air conditioning system is sprayed into the interior of the ejector enthalpy-increasing compressor from the ejector port, improving the displacement of the compressor, thereby improving the heating effect.

[0004] Generally, the ejector enthalpy-increasing air conditioning system is configured with an economizer that also serves as a subcooler to subcool the refrigerant. However, whether the economizer is too large or too small will affect the ejector enthalpy-increasing effect. If the economizer is too large, the equipment cost will be relatively high, and when a certain heat exchange amount is reached, there will also be a wasteful design without an additional heat source; if the economizer is too small, the ejector enthalpy-increasing or subcooling cannot meet the corresponding refrigeration system design parameters, resulting in a problem of low ejector enthalpy-increasing efficiency and a risk of liquid return, that is, part of the liquid-phase refrigerant is sprayed into the interior of the compressor through the ejector port, which may cause the compressor to fail. Content of the Utility Model

[0005] The purpose of the utility model is to provide an ejector enthalpy-increasing air conditioning system to solve the problems of low ejector enthalpy-increasing efficiency and a risk of liquid return.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A jet enthalpy-increasing air conditioning system, comprising: a compressor, which is provided with an exhaust port, a suction port and a jet port; an oil separator, the gas inlet of which is connected to the exhaust port of the compressor for separating lubricating oil in the refrigerant; a four-way valve, the inlet of which is connected to the gas outlet of the oil separator; a heat exchange assembly, which includes an indoor heat exchange unit and an outdoor heat exchange unit, the indoor heat exchange unit is connected to the outdoor heat exchange unit, the C pipe of the four-way valve is connected to the outdoor heat exchange unit, the outdoor heat exchange unit is connected with an outdoor expansion valve, the E pipe of the four-way valve is connected to the indoor heat exchange unit, and the indoor heat exchange unit is connected with an indoor expansion valve; a first economizer, both the outdoor expansion valve and the indoor expansion valve are connected to the first economizer for subcooling the refrigerant delivered from the outdoor expansion valve or the indoor expansion valve into the first economizer; a second economizer, which is connected to the first economizer for subcooling the refrigerant output by the first economizer, the oil return port of the oil separator is connected to the second economizer for delivering the lubricating oil to the second economizer, and the second economizer is connected to both the suction port and the jet port of the compressor for delivering the refrigerant to the jet port and the lubricating oil to the suction port; a gas-liquid separator, the gas inlet of which is connected to the S pipe of the four-way valve, and the gas outlet of which is connected to the suction port of the compressor; the compressor, the oil separator, the four-way valve, the indoor heat exchange unit, the outdoor heat exchange unit, the first economizer, the second economizer, and the gas-liquid separator are connected in sequence to form a loop.

[0008] Preferably, the oil separator is connected with an oil return capillary tube, and the oil return capillary tube is arranged between the oil return port of the oil separator and the second economizer.

[0009] Preferably, the outdoor heat exchange unit is connected with a check valve, the check valve is arranged in parallel with the outdoor expansion valve, and the flow direction of the refrigerant in the check valve is from the outdoor heat exchange unit to the first economizer.

[0010] Preferably, the first economizer is provided with a first main flow path and a first auxiliary flow path. The first main flow path has a first main inlet and a first main outlet, and the first auxiliary flow path has a first auxiliary inlet and a first auxiliary outlet. The first main flow path is in communication with both the outdoor heat exchange unit and the indoor heat exchange unit. The second economizer is provided with a second main flow path and a second auxiliary flow path. The second main flow path has a second main inlet and a second main outlet, and the second auxiliary flow path has a second auxiliary inlet and a second auxiliary outlet. The first auxiliary outlet is connected to the second auxiliary inlet, the second main inlet is connected to the oil return port of the oil separator, the second main outlet is connected to the suction port of the compressor, and the second auxiliary outlet is connected to the jet port of the compressor.

[0011] Preferably, the first economizer is connected to a first control member, and the first control member is connected to both the outdoor heat exchange unit and the indoor heat exchange unit for controlling the flow rate of the refrigerant delivered from the first economizer to the second economizer.

[0012] Preferably, the second economizer is further connected to a second control member. The second control member is disposed between the second economizer and the gas-liquid separator for controllably delivering the refrigerant from the second economizer to the gas-liquid separator.

[0013] Preferably, the first control member is an expansion valve, and the outlet of the expansion valve is connected to the first auxiliary inlet of the first economizer; and / or, the second control member is a solenoid valve, the inlet of the solenoid valve is connected to the second auxiliary outlet of the second economizer, and the outlet of the solenoid valve is connected to the gas inlet of the gas-liquid separator.

[0014] Preferably, the gas inlet of the gas-liquid separator is divided into two paths, one path is connected to the S pipe of the four-way valve, and the other path is connected to the second auxiliary outlet of the second economizer; and / or, the gas outlet of the gas-liquid separator is divided into two paths, one path is connected to the second main outlet of the second economizer, and the other path is connected to the suction port of the compressor.

[0015] Preferably, the jet enhanced enthalpy air conditioning system further includes a silencer, and the silencer is disposed between the second economizer and the jet port of the compressor.

[0016] Preferably, the second economizer is a double-pipe heat exchanger.

[0017] Advantages of the present utility model:

[0018] A jet-increased enthalpy air-conditioning system includes a compressor, an oil separator, a four-way valve, a heat exchange assembly, a first economizer, a second economizer and a gas-liquid separator. The compressor is provided with an exhaust port, a suction port and a jet port. The gas inlet of the oil separator is connected to the exhaust port of the compressor for separating the lubricating oil in the refrigerant. The inlet of the four-way valve is connected to the gas outlet of the oil separator. The heat exchange assembly includes an indoor heat exchange unit and an outdoor heat exchange unit. The indoor heat exchange unit is connected to the outdoor heat exchange unit. The C pipe of the four-way valve is connected to the outdoor heat exchange unit. The outdoor heat exchange unit is connected with an outdoor expansion valve. The E pipe of the four-way valve is connected to the indoor heat exchange unit. The indoor heat exchange unit is connected with an indoor expansion valve. Both the outdoor expansion valve and the indoor expansion valve are connected to the first economizer for subcooling the refrigerant transported from the outdoor expansion valve or the indoor expansion valve into the first economizer. The second economizer is connected to the first economizer for subcooling the refrigerant output from the first economizer. The oil return port of the oil separator is connected to the second economizer for transporting the lubricating oil to the second economizer. The second economizer is connected to both the suction port and the jet port of the compressor for transporting the refrigerant to the jet port and the lubricating oil to the suction port. The gas inlet of the gas-liquid separator is connected to the S pipe of the four-way valve, and the gas outlet of the gas-liquid separator is connected to the suction port of the compressor. The compressor, the oil separator, the four-way valve, the indoor heat exchange unit, the outdoor heat exchange unit, the first economizer, the second economizer and the gas-liquid separator are connected in sequence to form a loop.

[0019] In this way, the lubricating oil mixed in the refrigerant discharged from the exhaust port of the compressor can be separated in the oil separator. The separated refrigerant passes through the four-way valve and enters the outdoor heat exchange unit or the indoor heat exchange unit to realize the refrigeration or heating of the indoor environment. The high-temperature lubricating oil carrying more heat enters the second economizer and exchanges heat with the second economizer, so that the second economizer preheats the refrigerant transported to the jet port of the compressor, improves the jet-increased enthalpy effect and effectively utilizes the heat of the lubricating oil, and avoids the liquid-phase refrigerant and the gas-phase refrigerant from mixing into the compressor and causing the compressor to fail, thereby prolonging the service life of the compressor. The lubricating oil and the refrigerant are separated in the second economizer, which can enable the lubricating oil and the refrigerant to exchange heat fully without interference. After the high-temperature lubricating oil exchanges heat in the second economizer, its temperature drops. The lower-temperature lubricating oil returns to the inside of the compressor through the suction port of the compressor, which can continue to lubricate the internal parts of the compressor and reduce the damage of the high-temperature lubricating oil to the compressor. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of a jet-increased enthalpy air-conditioning system in an embodiment of the present invention.

[0021] In the figure:

[0022] 1. Compressor; 2. Oil separator; 21. Oil return capillary; 3. Four-way valve; 4. Heat exchange component; 41. Indoor heat exchange unit; 411. Indoor expansion valve; 42. Outdoor heat exchange unit; 421. Outdoor expansion valve; 422. Check valve; 5. First economizer; 51. First main flow path; 52. First auxiliary flow path; 53. First control component; 6. Second economizer; 61. Second main flow path; 62. Second auxiliary flow path; 63. Second control component; 7. Gas-liquid separator; 8. Silencer. Detailed implementation manners

[0023] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model are shown in the drawings, rather than all the structures.

[0024] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0025] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0026] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0027] Refer to Figure 1, the present utility model provides a jet enthalpy-increasing air conditioning system, which includes a compressor 1, an oil separator 2, a four-way valve 3, a heat exchange assembly 4, a first economizer 5, a second economizer 6 and a gas-liquid separator 7. The compressor 1 is provided with an exhaust port, a suction port and a jet port; the gas inlet of the oil separator 2 is connected to the exhaust port of the compressor 1 for separating the lubricating oil in the refrigerant; the inlet of the four-way valve 3 is connected to the gas outlet of the oil separator 2; the heat exchange assembly 4 includes an indoor heat exchange unit 41 and an outdoor heat exchange unit 42, the indoor heat exchange unit 41 is connected to the outdoor heat exchange unit 42, the C pipe of the four-way valve 3 is connected to the outdoor heat exchange unit 42, the outdoor heat exchange unit 42 is connected with an outdoor expansion valve 421, the E pipe of the four-way valve 3 is connected to the indoor heat exchange unit 41, and the indoor heat exchange unit 41 is connected with an indoor expansion valve 411.

[0028] In this embodiment, both the indoor heat exchange unit 41 and the outdoor heat exchange unit 42 are heat exchangers.

[0029] It should be noted that the high-temperature and high-pressure gaseous refrigerant transported by the compressor 1 to the oil separator 2 contains part of the lubricating oil. After the high-temperature lubricating oil flows through the oil separator 2, it is transported to the outside through the oil return port of the oil separator 2. During refrigeration, the refrigerant sequentially passes through the four-way valve 3, the outdoor heat exchange unit 42, the outdoor expansion valve 421, the first economizer 5, the indoor expansion valve 411, and the indoor heat exchange unit 41, so that the refrigerant inside the indoor heat exchange unit 41 absorbs the indoor heat and realizes the refrigeration of the indoor environment. The refrigerant in the indoor heat exchange unit 41 can flow into the four-way valve 3 and then circulate into the first economizer 5 to continue participating in refrigeration. When heating is required, the four-way valve 3 is controlled to change the flow direction of the refrigerant inside the indoor heat exchange unit 41 and the outdoor heat exchange unit 42, so that the high-temperature and high-pressure refrigerant flows from the four-way valve 3 to the indoor heat exchange unit 41, realizing the heat release and temperature increase of the indoor environment.

[0030] Furthermore, both the outdoor expansion valve 421 and the indoor expansion valve 411 are connected to the first economizer 5 for subcooling the refrigerant transported from the outdoor expansion valve 421 or the indoor expansion valve 411 into the first economizer 5; the second economizer 6 is connected to the first economizer 5 for subcooling the refrigerant output by the first economizer 5. The oil return port of the oil separator 2 is connected to the second economizer 6 for transporting the lubricating oil to the second economizer 6. The second economizer 6 is connected to both the suction port and the jet port of the compressor 1 for transporting the refrigerant to the jet port and the lubricating oil to the suction port; the gas inlet of the gas-liquid separator 7 is connected to the S pipe of the four-way valve 3, and the gas outlet of the gas-liquid separator 7 is connected to the suction port of the compressor 1; the compressor 1, the oil separator 2, the four-way valve 3, the indoor heat exchange unit 41, the outdoor heat exchange unit 42, the first economizer 5, the second economizer 6, and the gas-liquid separator 7 are sequentially connected to form a loop. Among them, the second economizer 6 is connected to the suction port of the compressor 1 through the gas-liquid separator 7; the C pipe, E pipe, and S pipe in the four-way valve 3 are all connected to the inlet.

[0031] It should be noted that the low-temperature and low-pressure refrigerant output by the outdoor heat exchange unit 42 or the indoor heat exchange unit 41 can be transported to the gas-liquid separator 7 through the S pipe of the four-way valve 3 and enter the suction port of the compressor 1 for compression. The high-temperature lubricating oil output from the oil return port of the oil separator 2 is cooled by the second economizer 6 and then returns to the inside of the compressor 1 through the suction port of the compressor 1.

[0032] In this way, the oil separator 2 can separate the lubricating oil mixed in the high-temperature and high-pressure gaseous refrigerant. The second economizer 6 can exchange heat between the lubricating oil and the refrigerant respectively, and enable the lower-temperature lubricating oil to enter the compressor 1 through the suction port to continue lubricating the inside of the compressor 1. The preheated refrigerant enters the compressor 1 through the jet port for jet enthalpy increase. The high-temperature lubricating oil conducts heat exchange in the second economizer 6, which can achieve the maximum efficiency of jet enthalpy increase, avoid the risk of liquid return caused by the gaseous refrigerant with partial liquid-phase refrigerant entering the compressor 1 through the jet port, improve the capacity and energy efficiency of the compressor 1, and prevent the compressor 1 from failing due to contact with the liquid-phase refrigerant.

[0033] It can be understood that the specific structures and installation positions of the indoor heat exchange unit 41 and the outdoor heat exchange unit 42 can be flexibly adjusted according to actual needs, as long as it can achieve heat exchange between the refrigerant and the indoor and outdoor environments to adjust the indoor temperature, and no more examples will be listed here.

[0034] Refer to Figure 1 , in some embodiments, the oil separator 2 is connected with an oil return capillary 21. The oil return capillary 21 is arranged between the oil return port of the oil separator 2 and the second economizer 6. That is to say, one end of the oil return capillary 21 is connected to the oil return port of the oil separator 2 through a pipeline, and the other end is connected to the second economizer 6 through a pipeline.

[0035] In this way, the oil return capillary 21 can control the flow rate of the lubricating oil, avoid excessive lubricating oil entering the second economizer 6 at one time and returning to the compressor 1 through the suction port, which helps the lubricating oil to flow stably. At the same time, the lubricating oil can fully exchange heat in the second economizer 6, effectively utilize the heat of the lubricating oil, improve the jet enthalpy increase efficiency, and reduce energy consumption.

[0036] Refer to Figure 1 , in some embodiments, the outdoor heat exchange unit 42 is connected with a check valve 422. The check valve 422 is arranged in parallel with the outdoor expansion valve 421, and the flow direction of the refrigerant in the check valve 422 is from the outdoor heat exchange unit 42 to the first economizer 5.

[0037] Thus, in the refrigeration mode, when the refrigerant flows from the outdoor heat exchange unit 42 to the indoor heat exchange unit 41 through the one-way valve 422 or the outdoor expansion valve 421, the pressure loss of the refrigerant is reduced, and the refrigeration efficiency of the system is improved. In the heating mode, the refrigerant enters the outdoor heat exchange unit 42 through the indoor heat exchange unit 41, the indoor expansion valve 411, and the outdoor expansion valve 421. The one-way valve 422 can prevent the reverse flow of the refrigerant, so that the refrigerant must pass through the outdoor expansion valve 421 and fully exchange heat in the outdoor heat exchange unit 42.

[0038] Referring to Figure 1 , in some embodiments, the first economizer 5 is provided with a first main flow path 51 and a first auxiliary flow path 52. The first main flow path 51 has a first main inlet and a first main outlet. The first auxiliary flow path 52 has a first auxiliary inlet and a first auxiliary outlet. The first main flow path 51 is connected to both the outdoor heat exchange unit 42 and the indoor heat exchange unit 41. The second economizer 6 is provided with a second main flow path 61 and a second auxiliary flow path 62. The second main flow path 61 has a second main inlet and a second main outlet. The second auxiliary flow path 62 has a second auxiliary inlet and a second auxiliary outlet. The first auxiliary outlet is connected to the second auxiliary inlet. The second main inlet is connected to the oil return port of the oil separator 2. The second main outlet is connected to the suction port of the compressor 1. The second auxiliary outlet is connected to the jet port of the compressor 1. Among them, the output end of the oil return capillary 21 is connected to the second main inlet.

[0039] It should be noted that the connection of the first main flow path 51 to the outdoor heat exchange unit 42 and the indoor heat exchange unit 41 can subcool the refrigerant in the first main flow path 51 during refrigeration or heating, thereby reducing the temperature of the refrigerant and enabling the indoor heat exchange unit 41 and the outdoor heat exchange unit 42 to operate stably. The connection of the first auxiliary flow path 52 to the second economizer 6 can enable the refrigerant circulated through the indoor heat exchange unit 41 and the outdoor heat exchange unit 42 to exchange heat again in the first auxiliary flow path 52 and be transported to the second economizer 6; the lubricating oil flows in the second main flow path 61 and is transported to the suction port of the compressor 1. The refrigerant transported from the first auxiliary flow path 52 to the second auxiliary flow path 62 enters the jet port of the compressor 1 for jet enthalpy increase after passing through the gas-liquid separator 7, so as to realize the separation of the lubricating oil and the refrigerant in the second economizer 6 and make full use of the heat of the lubricating oil.

[0040] In this way, the refrigerant can fully exchange heat in the first main flow path 51 and the first auxiliary flow path 52 and be delivered into the second auxiliary flow path 62. At the same time, the high-temperature lubricating oil output from the oil return port of the oil separator 2 provides the heat required for heat exchange in the second main flow path 61, enabling the refrigerant that has fully exchanged heat in the second economizer 6 to be delivered to the jet port of the compressor 1 through the second auxiliary flow path 62, avoiding the failure of the compressor 1 due to contact with the liquid-phase refrigerant. This not only utilizes the heat of the high-temperature lubricating oil to improve the jet enthalpy increase efficiency but also can reduce the damage of the high-temperature lubricating oil to the compressor 1 and extend the service life of the compressor 1.

[0041] Refer to Figure 1 , in some embodiments, the first economizer 5 is connected with a first control member 53. The first control member 53 is connected to both the outdoor heat exchange unit 42 and the indoor heat exchange unit 41 and is used to control the flow rate of the refrigerant delivered from the first economizer 5 to the second economizer 6. Further, the first control member 53 is an expansion valve, and the outlet of the expansion valve is connected to the first auxiliary inlet of the first economizer 5.

[0042] In this embodiment, the first control member 53 is connected to both the outdoor expansion valve 421 and the indoor expansion valve 411 to control the flow rate of the refrigerant entering the first auxiliary flow path 52.

[0043] In this way, under the action of the indoor expansion valve 411, the outdoor expansion valve 421, and the first control member 53, the flow rate of the refrigerant flowing to the outdoor heat exchange unit 42, the indoor heat exchange unit 41, and the first economizer 5 can be controlled, so that the refrigerant can fully exchange heat and the heat exchange efficiency can be improved. The refrigerant delivered to the second auxiliary flow path 62 through the first auxiliary flow path 52 can be preheated by the heat of the lubricating oil in the second economizer 6, enabling the gaseous refrigerant at the intermediate pressure point (i.e., greater than the gas pressure at the suction port of the compressor 1 and less than the gas pressure at the discharge port of the compressor 1) to enter the compressor 1 from the jet port of the compressor 1, improving the jet enthalpy increase effect; the refrigerant can also directly enter the gas-liquid separator 7 through the S pipe of the four-way valve 3, and after gas-liquid separation, it returns to the inside of the compressor 1 through the suction port of the compressor 1 for compression.

[0044] Refer to Figure 1 , in some embodiments, the second economizer 6 is further connected with a second control member 63. The second control member 63 is arranged between the second economizer 6 and the gas-liquid separator 7 and is used to control the second economizer 6 to selectively deliver the refrigerant to the gas-liquid separator 7. Further, the second control member 63 is a solenoid valve, the inlet of the solenoid valve is connected to the second auxiliary outlet of the second economizer 6, and the outlet of the solenoid valve is connected to the gas inlet of the gas-liquid separator 7.

[0045] In this embodiment, the inlet of the solenoid valve and the jet port of the compressor 1 are both connected to the second auxiliary outlet of the second economizer 6.

[0046] It should be noted that when jet enthalpy increase work needs to be carried out, the solenoid valve is closed so that the gaseous refrigerant output from the second auxiliary outlet is sprayed into the interior of the compressor 1 through the jet port of the compressor 1, thereby improving the working efficiency of the compressor 1; when jet enthalpy increase work does not need to be carried out, the solenoid valve is opened so that the gaseous refrigerant output from the second auxiliary outlet enters the gas-liquid separator 7 through the solenoid valve, and the refrigerant enters the interior of the compressor 1 through the gas-liquid separator 7 and the suction port of the compressor 1.

[0047] In this way, by controlling the opening and closing of the solenoid valve, the refrigerant can flow to the jet port or into the gas-liquid separator 7 according to the working needs, improving the jet enthalpy increase effect; under the action of high-temperature lubricating oil, the refrigerant exchanges heat fully in the second economizer 6, avoiding the liquid-phase refrigerant entering the interior of the compressor 1 through the jet port and causing the compressor 1 to fail, and prolonging the service life of the compressor 1.

[0048] It can be understood that the specific structures of the first control member 53 and the second control member 63 can be adjusted according to actual needs, and are not limited to expansion valves and solenoid valves, as long as they can control whether the refrigerant flows and the flow rate during flow, and will not be listed in detail here.

[0049] Refer to Figure 1 , in some embodiments, the gas inlet of the gas-liquid separator 7 is divided into two paths, one of which is connected to the S pipe of the four-way valve 3, and the other is connected to the second auxiliary outlet of the second economizer 6; the gas outlet of the gas-liquid separator 7 is divided into two paths, one of which is connected to the second main outlet of the second economizer 6, and the other is connected to the suction port of the compressor 1. That is to say, the pipeline connected to the S pipe of the four-way valve 3 and the pipeline connected to the output end of the second control member 63 converge and then are connected to the gas inlet of the gas-liquid separator 7, and the pipeline connected to the second main outlet of the second economizer 6 and the pipeline connected to the gas outlet of the gas-liquid separator 7 converge and then are connected to the suction port of the compressor 1.

[0050] In this way, both the refrigerant output from the S pipe of the four-way valve 3 and the refrigerant output from the solenoid valve can enter the gas-liquid separator 7. After the low-temperature lubricating oil output from the second main outlet of the second economizer 6 is mixed with the low-temperature and low-pressure gaseous refrigerant output from the gas outlet of the gas-liquid separator 7, it enters the interior of the compressor 1 through the suction port of the compressor 1, which can avoid the lubricating oil temperature being too high and affecting the normal use of the compressor 1, and enable the lubricating oil to exchange heat fully with the second economizer 6, avoiding the liquid-phase refrigerant being transported to the interior of the compressor 1 through the jet port.

[0051] Refer to Figure 1, in some embodiments, the jet enthalpy-increasing air-conditioning system further includes a silencer 8, and the silencer 8 is disposed between the second economizer 6 and the jet port of the compressor 1. In this embodiment, the inlet of the silencer 8 is connected to the second auxiliary outlet of the second economizer 6 through a pipeline, and the outlet of the silencer 8 is connected to the jet port of the compressor 1 through a pipeline.

[0052] Thus, in the jet enthalpy-increasing cycle, since the flow rate of the gaseous refrigerant entering the compressor 1 through the jet port is relatively high, airflow noise and vibration will be generated. The silencer 8 can help smooth the airflow, reduce the turbulence effect in the airflow, enable the gaseous refrigerant to enter the compressor 1 more smoothly, improve the jet enthalpy-increasing efficiency and stability of the compressor 1; and the silencer 8 can remove the liquid droplets in the gaseous refrigerant, further reduce the risk of liquid return, and extend the service life of the compressor 1.

[0053] Refer to Figure 1 , in some embodiments, the second economizer 6 is a shell-and-tube heat exchanger.

[0054] Thus, the flow channel of the shell-and-tube heat exchanger is relatively large, which is beneficial to the smooth flow of the lubricating oil with relatively high viscosity in the flow channel, reduces the flow resistance, improves the heat exchange efficiency, and facilitates the full heat exchange of the lubricating oil with the second economizer 6, thereby preheating the refrigerant in the second auxiliary flow path 62 of the second economizer 6, avoiding the risk of liquid return, and improving the jet enthalpy-increasing efficiency.

[0055] It can be understood that the first economizer 5 can adopt a shell-and-tube heat exchanger or a plate heat exchanger. The specific structures of the first economizer 5 and the second economizer 6 can be adjusted according to actual needs and will not be elaborated here.

[0056] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A jet enthalpy air conditioning system, characterized in that: include: A compressor (1), wherein the compressor (1) is provided with an exhaust port, an intake port and an exhaust port; an oil separator (2), the gas inlet of the oil separator (2) being connected to the exhaust port of the compressor (1) and being used for separating lubricating oil from the refrigerant; A four-way valve (3), the inlet of the four-way valve (3) being connected to the gas outlet of the oil separator (2); A heat exchange component (4), the heat exchange component (4) comprising an indoor heat exchange unit (41) and an outdoor heat exchange unit (42), the indoor heat exchange unit (41) being connected to the outdoor heat exchange unit (42), the C tube of the four-way valve (3) being connected to the outdoor heat exchange unit (42), the outdoor heat exchange unit (42) being connected to an outdoor expansion valve (421), the E tube of the four-way valve (3) being connected to the indoor heat exchange unit (41), and the indoor heat exchange unit (41) being connected to an indoor expansion valve (411); A first economizer (5), wherein the outdoor expansion valve (421) and the indoor expansion valve (411) are both connected to the first economizer (5) and are used to supercool the refrigerant transported from the outdoor expansion valve (421) or the indoor expansion valve (411) to the first economizer (5); a second economizer (6), the second economizer (6) being connected to the first economizer (5) and being used for supercooling the refrigerant outputted from the first economizer (5); the oil return port of the oil separator (2) being connected to the second economizer (6) and being used for conveying the lubricating oil to the second economizer (6); the second economizer (6) being connected to both the air intake port and the air discharge port of the compressor (1) and being used for conveying the refrigerant to the air discharge port and the lubricating oil to the air intake port; A gas-liquid separator (7), wherein the gas inlet of the gas-liquid separator (7) is connected to the S pipe of the four-way valve (3), and the gas outlet of the gas-liquid separator (7) is connected to the air intake port of the compressor (1); The compressor (1), the oil separator (2), the four-way valve (3), the indoor heat exchange unit (41), the outdoor heat exchange unit (42), the first economizer (5), the second economizer (6), and the gas-liquid separator (7) are connected in sequence to form a loop.

2. The jet enthalpy air conditioning system according to claim 1, characterized in that: The oil separator (2) is connected to an oil return capillary (21), and the oil return capillary (21) is arranged between the oil return port of the oil separator (2) and the second economizer (6).

3. The jet enthalpy air conditioning system according to claim 1, characterized in that: The outdoor heat exchange unit (42) is connected to a one-way valve (422), the one-way valve (422) is arranged in parallel with the outdoor expansion valve (421), and the flow direction of the refrigerant in the one-way valve (422) is from the outdoor heat exchange unit (42) to the first economizer (5).

4. The jet enthalpy air conditioning system according to claim 1, characterized in that: The first economizer (5) is provided with a first main flow path (51) and a first auxiliary flow path (52), the first main flow path (51) having a first main inlet and a first main outlet, the first auxiliary flow path (52) having a first auxiliary inlet and a first auxiliary outlet, the first main flow path (51) being connected to both the outdoor heat exchange unit (42) and the indoor heat exchange unit (41); the second economizer (6) is provided with a second main flow path (61) and a second auxiliary flow path (62), the second main flow path (61) having a second main inlet and a second main outlet, the second auxiliary flow path (62) having a second auxiliary inlet and a second auxiliary outlet, the first auxiliary outlet being connected to the second auxiliary inlet, the second main inlet being connected to the oil return port of the oil separator (2), the second main outlet being connected to the air intake port of the compressor (1), and the second auxiliary outlet being connected to the air injection port of the compressor (1).

5. The jet enthalpy air conditioning system according to claim 4, characterized in that: The first economizer (5) is connected to a first control element (53), and the first control element (53) is connected to both the outdoor heat exchange unit (42) and the indoor heat exchange unit (41), and is used to control the flow rate of the refrigerant delivered from the first economizer (5) to the second economizer (6).

6. The jet enthalpy air conditioning system according to claim 5, characterized in that: The second economizer (6) is also connected to a second control element (63), which is arranged between the second economizer (6) and the gas-liquid separator (7) and is used to control the second economizer (6) to selectively deliver the refrigerant to the gas-liquid separator (7).

7. The jet enthalpy air conditioning system according to claim 6, characterized in that: The first control component (53) is an expansion valve, the outlet of which is connected to the first auxiliary inlet of the first economizer (5); and / or the second control component (63) is a solenoid valve, the inlet of which is connected to the second auxiliary outlet of the second economizer (6), and the outlet of which is connected to the gas inlet of the gas-liquid separator (7).

8. The jet enthalpy air conditioning system according to claim 4, characterized in that: The gas inlet of the gas-liquid separator (7) is divided into two paths, one of which is connected to the S pipe of the four-way valve (3), and the other is connected to the second auxiliary outlet of the second economizer (6); and / or, the gas outlet of the gas-liquid separator (7) is divided into two paths, one of which is connected to the second main outlet of the second economizer (6), and the other is connected to the suction port of the compressor (1).

9. The jet enthalpy air conditioning system according to any one of claims 1 to 8, characterized in that: The jet enthalpy air conditioning system further comprises a muffler (8), wherein the muffler (8) is arranged between the second economizer (6) and the jet port of the compressor (1).

10. The jet enthalpy air conditioning system according to any one of claims 1 to 8, characterized in that: The second economizer (6) is a shell-and-tube heat exchanger.

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