An air conditioning system

Abstract

The embodiment of the utility model provides an air conditioning system, which relates to the field of air conditioning technology. The air conditioning system is equipped with an ejector as a liquid supply power, which is low in cost and stable and reliable, so that the refrigeration system can operate safely and stably. The air conditioning system includes: a refrigeration system, and the refrigeration system includes: a compressor, a condenser, an evaporator, an ejector and a gas-liquid separator; the suction end of the condenser is connected to the exhaust end of the compressor; the exhaust end of the evaporator is connected to the suction end of the compressor, and the return end of the evaporator is connected to the return end of the compressor; the first input end of the ejector is connected to the first liquid discharge end of the condenser, and the second input end of the ejector is connected to the exhaust end of the compressor; the input end of the gas-liquid separator is connected to the output end of the ejector, and the output end of the gas-liquid separator is connected to the liquid inlet end of the compressor; the exhaust end of the gas-liquid separator is connected to the first air inlet end of the evaporator.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to an air conditioning system. Background Art

[0002] With the development of science and technology, the application of electrical appliances has become more and more common, and the daily lives of more and more people are closely related to air-conditioning systems.

[0003] The air conditioning system includes: a compressor. In the development process of compressors, especially centrifugal compressors, compressors have gradually developed into lubricating oil-free systems. Oil-free centrifugal compressor units eliminate oil lubrication system components and avoid the degradation of heat exchanger performance due to oil contamination. In addition, they also simplify the structure of the system and have received much attention in the HVAC industry.

[0004] One development direction of oil-free lubrication is to use oil-free centrifugal compressor units with magnetic bearings, but the cost is high, the bearing control is complex, and it belongs to the area of ​​high-end energy-saving market competition, which is not conducive to further promotion. Another development direction of oil-free lubrication is to use oil-free centrifugal units with refrigerant liquid lubrication or gas lubrication, but in general, the existing oil-free lubrication system still has some safety issues. Utility Model Content

[0005] An embodiment of the utility model provides an air conditioning system, which is additionally provided with an ejector as a liquid supply power, has low cost and is stable and reliable, so that the refrigeration system can operate safely and stably.

[0006] The air-conditioning system comprises: a refrigeration system, which comprises: a compressor, a condenser, an evaporator, an ejector and a gas-liquid separator; the air intake end of the condenser is connected to the air exhaust end of the compressor; the first input end of the ejector is connected to the first liquid discharge end of the condenser, and the second input end of the ejector is connected to the air exhaust end of the compressor; the air exhaust end of the evaporator is connected to the air intake end of the compressor, the air return end of the evaporator is connected to the air return end of the compressor, and the input end of the evaporator is connected to the output end of the condenser; the input end of the gas-liquid separator is connected to the output end of the ejector, the output end of the gas-liquid separator is connected to the compressor, and the air exhaust end of the gas-liquid separator is connected to the first air intake end of the evaporator.

[0007] Based on the above scheme, some embodiments of the present application provide an air-conditioning system, which is additionally provided with an ejector, and provides power for the refrigerant liquid by introducing high-pressure gas discharged from the compressor into the ejector, thereby omitting relatively expensive electric components such as the refrigerant pump used in conventional schemes. The system has low cost and is stable and reliable, and ensures that at all stages of the operation of the refrigeration system, the bearings can obtain sufficient refrigerant liquid supply, and their lubrication state can be effectively guaranteed, thereby ensuring the normal operation of the refrigeration system.

[0008] In some embodiments, the refrigeration system further includes: an economizer; the air supply end of the economizer is connected to the air inlet end of the compressor; the liquid inlet end of the economizer is connected to the second liquid discharge end of the condenser; the liquid discharge end of the economizer is connected to the liquid inlet end of the evaporator.

[0009] In some embodiments, the refrigeration system also includes: a refrigeration cycle loop; the refrigeration cycle loop includes: an air intake pipeline from the exhaust end of the evaporator to the suction end of the compressor; an air supply pipeline from the air supply end of the economizer to the air intake end of the compressor; a first exhaust pipeline from the exhaust end of the compressor to the suction end of the condenser; a first liquid supply pipeline from the second discharge end of the condenser to the liquid inlet end of the economizer; a liquid return pipeline from the discharge end of the economizer to the liquid inlet end of the evaporator; and a connecting pipeline from the output end of the condenser to the input end of the evaporator.

[0010] In some embodiments, the refrigeration system also includes: a bearing lubrication circuit; the bearing lubrication circuit includes: a second liquid supply pipeline from the first discharge end of the condenser to the first input end of the ejector; a second exhaust pipeline from the exhaust end of the compressor to the second input end of the ejector; a third liquid supply pipeline from the output end of the ejector to the gas-liquid separator; a fourth liquid supply pipeline from the output end of the gas-liquid separator to the liquid inlet end of the compressor; and a low-pressure return air pipeline from the return air end of the compressor to the return air end of the evaporator.

[0011] In some embodiments, the refrigeration system also includes: a heat exchanger; a first input end of the heat exchanger is connected to the output end of the gas-liquid separator, a second input end of the heat exchanger is connected to the first discharge end of the condenser, a first output end of the heat exchanger is connected to the liquid inlet end of the compressor, and a second output end of the heat exchanger is connected to the air inlet end of the evaporator.

[0012] In some embodiments, when the refrigeration system includes the heat exchanger: the bearing lubrication circuit includes: a second liquid supply pipeline from the first discharge end of the condenser to the first input end of the ejector; a second exhaust pipeline from the exhaust end of the compressor to the second input end of the ejector; a third liquid supply pipeline from the output end of the ejector to the gas-liquid separator; a fourth liquid supply pipeline from the output end of the gas-liquid separator to the first input end of the heat exchanger; a fifth liquid supply pipeline from the first output end of the heat exchanger to the liquid inlet end of the compressor; a sixth liquid supply pipeline from the first discharge end of the condenser to the second input end of the heat exchanger; a return air pipeline from the second output end of the heat exchanger to the air inlet end of the evaporator; and a low-pressure return air pipeline from the return air end of the compressor to the return air end of the evaporator.

[0013] In some embodiments, the fourth liquid supply pipeline from the output end of the gas-liquid separator to the first input end of the heat exchanger includes: a first branch pipeline and a second branch pipeline; wherein the first branch pipeline is arranged at the bottom of the gas-liquid separator, and the second branch pipeline is arranged in the middle of the gas-liquid separator; the first branch pipeline and the second branch pipeline are connected in parallel; a first valve is arranged on the first branch pipeline, and a second valve is arranged on the second branch pipeline.

[0014] The refrigeration system further includes: a fourth exhaust pipeline from the exhaust end of the gas-liquid separator to the air inlet end of the evaporator; and a third valve is arranged on the fourth exhaust pipeline.

[0015] In some embodiments, the fifth liquid supply pipeline from the first output end of the heat exchanger to the liquid inlet end of the compressor includes: a third branch pipeline, a fourth branch pipeline and a fifth branch pipeline; the third branch pipeline is provided with a first sensor, and the fourth branch pipeline is provided with a second filter; the fifth branch pipeline is provided with a second sensor, a third sensor and a fourth sensor; wherein the third branch pipeline is connected in parallel with the fourth branch pipeline.

[0016] In some embodiments, the fifth branch pipeline includes: a sixth branch pipeline and a seventh branch pipeline; the sixth branch pipeline is connected to the front bearing of the compressor, and the seventh branch pipeline is connected to the rear bearing of the compressor.

[0017] In some embodiments, the refrigeration system also includes: a first pump; the first pump is arranged on the sixth liquid supply pipeline from the first liquid discharge end of the condenser to the second input end of the heat exchanger; the sixth liquid supply pipeline from the first liquid discharge end of the condenser to the second input end of the heat exchanger is also provided with an electronic expansion valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the technical solution of the utility model and constitute a part of the specification. Together with the embodiments of the utility model, they are used to explain the technical solution of the utility model and do not constitute a limitation on the technical solution of the utility model.

[0019] Figure 1 A schematic diagram of an existing magnetic levitation centrifugal compressor provided in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of a hybrid bearing provided in an embodiment of the present application;

[0021] Figure 3 A schematic diagram of an air conditioning system provided in an embodiment of the present application;

[0022] Figure 4 A structural block diagram of a refrigeration system provided in an embodiment of the present application;

[0023] Figure 5 A structural block diagram of another refrigeration system provided in an embodiment of the present application;

[0024] Figure 6 A schematic diagram of a refrigeration system provided in an embodiment of the present application;

[0025] Figure 7 A schematic diagram of another refrigeration system provided in an embodiment of the present application;

[0026] Figure 8 A schematic diagram of another refrigeration system provided in an embodiment of the present application;

[0027] Fig. 9 A schematic diagram of another refrigeration system provided in an embodiment of the present application;

[0028] Fig.10 A schematic diagram of another refrigeration system provided in an embodiment of the present application;

[0029] Fig.11 An overall schematic diagram of a refrigeration system provided in an embodiment of the present application;

[0030] Fig.12 A structural block diagram of another refrigeration system provided in an embodiment of the present application;

[0031] Fig.13 A specific schematic diagram of a compressor provided in an embodiment of the present application;

[0032] Fig.14 An overall schematic diagram of a second solution of a refrigeration system provided in an embodiment of the present application;

[0033] Fig.15An overall schematic diagram of a third scheme of a refrigeration system provided in an embodiment of the present application.

[0034] Reference numerals:

[0035] 1- compressor; 2- condenser; 3- ejector; 4- gas-liquid separator; 5- evaporator; 6- economizer; 7- heat exchanger; 8- suction guide vane; 9- shaft; 10- first-stage impeller; 11- second-stage impeller; 12- motor; 13- diffuser; 14- return fluid; 21- first valve; 22- second valve; 23- third valve; 31- liquid level sensor; 32- ball valve; 33- first orifice plate; 34- second orifice plate; 35- electronic expansion valve; 41- refrigerant charging valve; 42- liquid level switch; 43- one-way valve; 51- first filter; 52- first sensor; 53- second filter; 54- second sensor; 55- third sensor; 56- fourth sensor; 57- first sight glass.

[0036] 100-refrigeration system; 101-refrigeration cycle; 102-intake pipeline; 103-air supply pipeline; 104-first exhaust pipeline; 105-first liquid supply pipeline; 106-return liquid pipeline; 110-bearing lubrication circuit; 111-second liquid supply pipeline; 112-second exhaust pipeline; 113-third liquid supply pipeline; 114-fourth liquid supply pipeline; 115-fifth liquid supply pipeline; 116-sixth liquid supply pipeline; 117-return air pipeline; 118-connecting pipeline; 121-first branch pipeline; 122-second branch pipeline; 123-third branch pipeline; 124-fourth branch pipeline; 125-fifth branch pipeline; 126-sixth branch pipeline; 127-seventh branch pipeline; 131-fourth exhaust pipeline; 135-low-pressure return air pipeline; 1000-air conditioning system; HV-hot gas bypass valve; GV-air supply valve; EV1-first electric valve; EV2-second electric valve. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0040] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, when describing the pipeline, the "connected" and "connection" used in the present utility model have the meaning of conduction. The specific meaning needs to be understood in conjunction with the context.

[0041] In the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0042] As described in the background art, with the development of science and technology, the application of electrical appliances is becoming more and more common, and the daily lives of more and more people are closely related to air-conditioning systems.

[0043] The air conditioning system includes: a compressor; and in the development process of compressors, especially the development process of centrifugal compressors, compressors have gradually developed into lubricating oil-free systems. Oil-free centrifugal compressor units eliminate oil lubrication system components and avoid the degradation of heat exchanger performance due to oil contamination. In addition, it also simplifies the structure of the system and has received much attention in the HVAC industry.

[0044] Reference Figure 1 , Figure 1 This is a schematic diagram of a magnetic centrifugal compressor. One development direction of oil-free lubrication is to use an oil-free centrifugal compressor unit with magnetic bearings, which started with a small turbocharger compressor (70RT) driven by a permanent magnet motor and equipped with magnetic bearings, and then 500RT, and then expanded to 700RT, and later to 1500RT (dual compressor); however, the cost is high, the bearing control is complex, and it belongs to the area of ​​high-end energy-saving market competition, which is not conducive to further promotion.

[0045] Another development direction of oil-free lubrication is to use oil-free centrifugal units with refrigerant liquid lubrication or gas lubrication. For oil-free centrifugal units with refrigerant liquid lubrication, oil-free two-stage centrifugal units (180-390RT) have been released, which use permanent magnet motors with refrigerant-lubricated bearings; the 19DV model has also been released and has been put into mass production, but the refrigerant it uses is negative pressure refrigerant R1233zd, which is expensive and has a small market promotion volume. Figure 2 As shown in the figure, since traditional steel bearings cannot be lubricated by refrigerants, the new product's "hybrid bearing" uses a new ceramic material and a low-viscosity refrigerant to reduce mechanical losses. But in general, the existing oil-free lubrication system still has some safety issues. The stability and continuity of the refrigerant liquid bearing supply require special attention.

[0046] Based on this, the embodiment of the present utility model provides an air conditioning system. Figure 3 As shown, the air conditioning system 1000 includes: a refrigeration system 100 .

[0047] In some embodiments, the refrigeration system 100 is located in a central air-conditioning system. In some embodiments, the central air-conditioning system may be a water system.

[0048] like Figure 4 As shown, the refrigeration system 100 includes: a compressor 1, a condenser 2, an ejector 3 and a gas-liquid separator 4.

[0049] The compressor 1 comprises an exhaust end 1A, a liquid inlet end 1B, a gas return end 1C and a gas suction end 1D.

[0050] The condenser 2 comprises an air suction end 2A and a first liquid discharge end 2B.

[0051] The ejector 3 comprises a first input terminal 3A, a second input terminal 3B and an output terminal 3C.

[0052] The gas-liquid separator 4 includes an input end 4A, an output end 4B and an exhaust end 4C.

[0053] The evaporator 5 includes an exhaust port 5A, a return port 5B and a first intake port 5C.

[0054] The suction end 2A of the condenser 2 is connected to the exhaust end 1A of the compressor 1; the first input end 3A of the ejector 3 is connected to the first discharge end 2B of the condenser 2, and the second input end 3B of the ejector 3 is connected to the exhaust end 1A of the compressor 1.

[0055] The exhaust end 5A of the evaporator 5 is connected to the suction end 1D of the compressor 1 , and the return end 5B of the evaporator 5 is connected to the return end 1C of the compressor 1 .

[0056] The input end 4A of the gas-liquid separator 4 is connected to the output end 3C of the ejector 3 , the output end 4B of the gas-liquid separator 4 is connected to the liquid inlet end 1B of the compressor 1 , and the exhaust end 4C of the gas-liquid separator 4 is connected to the first air inlet end 5C of the evaporator 5 .

[0057] It should be noted that the main function of the ejector 3 is to utilize a high-speed high-energy flow (which can be a liquid, gas or other material flow) to eject another low-speed low-energy flow, thereby realizing the transfer of energy and mass. Specifically, the ejector ejects the high-speed fluid through its core component nozzle and enters the mixing chamber, where it mixes with the surrounding low-speed fluid, and through the mixing effect of the boundary, the high-speed fluid transfers its energy to the low-speed fluid. In the course of work, the ejector first accelerates the fluid through the nozzle, and then these accelerated fluids enter the mixing chamber, mix with the surrounding fluids, and finally form a uniform mixed fluid output. This process not only involves the speed change of the fluid, but also includes the conversion and transfer of energy.

[0058] Gas-liquid separator is a device used to separate gas and liquid, and is widely used in chemical, petroleum, natural gas and other industries. Its working principle is mainly based on the density difference between gas and liquid. By designing a specific flow pipeline, the gas and liquid are separated and discharged separately during the flow process.

[0059] That is to say, the gas discharged from the exhaust end 1A of the compressor 1 is high-speed gas, which enters the second input end 3B of the ejector 3, and the first liquid discharge end 2B of the condenser 2 transfers the refrigerant liquid to the first input end 3A of the ejector 3.

[0060] The high-speed gas discharged from the exhaust end 1A of the compressor 1 is used to eject the refrigerant liquid transmitted by the first liquid discharge end 2B of the condenser 2. The ejector 3 ejects the high-speed gas through its core component nozzle and enters the mixing chamber, where it mixes with the surrounding low-speed refrigerant liquid. Through the mixing effect of the boundary, the high-speed gas transfers its energy to the low-speed refrigerant liquid, and finally forms a uniform mixture that is transmitted to the input end 4A of the gas-liquid separator 4. The gas-liquid separator 4 then separates the refrigerant liquid and the gas.

[0061] Based on the above scheme, some embodiments of the present application provide an air-conditioning system, which is additionally provided with an ejector, and provides power for the refrigerant liquid by introducing high-pressure gas discharged from the compressor into the ejector, thereby omitting relatively expensive electric components such as the refrigerant pump used in conventional schemes. The system has low cost and is stable and reliable, and ensures that at all stages of the operation of the refrigeration system, the bearings can obtain sufficient refrigerant liquid supply, and their lubrication state can be effectively guaranteed, thereby ensuring the normal operation of the refrigeration system.

[0062] In some embodiments, Figure 5As shown, the refrigeration system 100 further includes an economizer 6 .

[0063] The compressor 1 further includes an air intake end 1E.

[0064] The condenser 2 further includes: a second liquid discharge port 2C and an output port 2D.

[0065] The evaporator 5 comprises an input end 5D and a liquid inlet end 5E.

[0066] The economizer 6 includes an air supply end 6A, a liquid inlet end 6B, and a liquid discharge end 6C.

[0067] The air supply end 6A of the economizer 6 is connected to the air inlet end 1E of the compressor 1; the liquid inlet end 6B of the economizer 6 is connected to the second liquid discharge end 2C of the condenser 2; the liquid discharge end of the economizer is connected to the liquid inlet end of the evaporator; the input end 5D of the evaporator 5 is connected to the output end 2D of the condenser 2.

[0068] Solution 1: In some embodiments, Figure 6 As shown, the refrigeration system 100 further includes: a refrigeration cycle circuit 101 .

[0069] The refrigeration cycle 101 includes: an air intake pipeline 102 from the exhaust end 5A of the evaporator 5 to the air intake end 1D of the compressor 1; an air supply pipeline 103 from the air supply end 6A of the economizer 6 to the air intake end 1E of the compressor 1; a first exhaust pipeline 104 from the exhaust end 1A of the compressor 1 to the air intake end 2A of the condenser 2; a first liquid supply pipeline 105 from the second liquid discharge end 2C of the condenser 2 to the liquid inlet end 6B of the economizer 6; a liquid return pipeline 106 from the liquid discharge end 6C of the economizer 6 to the liquid inlet end 5E of the evaporator 5; and a connecting pipeline 118 from the output end 2D of the condenser 2 to the input end 5D of the evaporator 5.

[0070] Among them, the above-mentioned refrigeration cycle loop 101 refers to: low-temperature and low-pressure gaseous refrigerant is evaporated from the evaporator 5, and the low-temperature and low-pressure gaseous refrigerant is transmitted to the compressor 1 through the suction pipeline 102 from the exhaust end 5A of the evaporator 5 to the suction end 1D of the compressor 1, and the first-stage impeller 10 in the compressor 1 compresses the low-temperature and low-pressure gaseous refrigerant.

[0071] The medium-temperature and medium-pressure saturated gas obtained from the economizer 6 is transmitted to the compressor 1 through the air supply pipeline 103 from the air supply end 6A of the economizer 6 to the air inlet end 1E of the compressor 1. The compressor 1 mixes the medium-temperature and medium-pressure gaseous refrigerant compressed by the first-stage impeller 10 with the medium-temperature and medium-pressure saturated gas, and compresses it through the second-stage impeller 11 to finally obtain a high-temperature and high-pressure gaseous refrigerant.

[0072] Compressor 1 transmits high-temperature and high-pressure gaseous refrigerant to condenser 2 through the first exhaust pipe 104 from the exhaust end 1A of compressor 1 to the intake end 2A of condenser 2; the high-temperature and high-pressure gaseous refrigerant will be cooled by the cooling water in condenser 2 and phase-changed into high-temperature and high-pressure liquid refrigerant.

[0073] High-temperature and high-pressure liquid refrigerant is transmitted to the economizer 6 through the first liquid supply pipeline 105 from the second liquid discharge end 2C of the condenser 2 to the liquid inlet end 6B of the economizer 6; the high-temperature and high-pressure liquid refrigerant is separated into liquid refrigerant and flashed gaseous refrigerant in the economizer 6; the gaseous refrigerant is transmitted to the compressor 1 through the air supply pipeline 103 from the air supply end 6A of the economizer 6 to the air inlet end 1E of the compressor 1, and the liquid refrigerant is transmitted to the evaporator 5 through the liquid return pipeline 106 from the liquid discharge end 6C of the economizer 6 to the liquid inlet end 5B of the evaporator 5; the liquid refrigerant is evaporated through the evaporator 5 to obtain a low-temperature and low-pressure gaseous refrigerant, and then the low-temperature and low-pressure gaseous refrigerant is transmitted to the compressor 1 through the air intake pipeline 102 from the exhaust end 5A of the evaporator 5 to the air intake end 1D of the compressor 1, and finally a refrigeration cycle 101 is formed.

[0074] In some embodiments, Figure 6 As shown, the refrigeration system further includes a bearing lubrication circuit 110 .

[0075] The bearing lubrication circuit 110 includes: a second liquid supply pipeline 111 from the first discharge end 2B of the condenser 2 to the first input end 3A of the ejector 3; a second exhaust pipeline 112 from the exhaust end 1A of the compressor 1 to the second input end 3B of the ejector 3; a third liquid supply pipeline 113 from the output end 3C of the ejector 3 to the input end 4A of the gas-liquid separator 4; a fourth liquid supply pipeline 114 from the output end 4B of the gas-liquid separator 4 to the liquid inlet end 1B of the compressor 1; and a low-pressure return air pipeline 135 from the return air end 1C of the compressor 1 to the return air end 5B of the evaporator 5.

[0076] The bearing lubrication circuit 110 refers to: a pipeline is drawn out from the first exhaust pipeline 104 from the exhaust end 1A of the compressor 1 to the suction end 2A of the condenser 2, that is, the second exhaust pipeline 112 is connected to the second input end 3B of the ejector 3, and the first input end 3A of the ejector 3 is connected to the bottom of the condenser 2, that is, the first liquid discharge end 2B of the condenser 2. The high-speed gas discharged from the exhaust end 1A of the compressor 1 is used to eject the refrigerant liquid transmitted by the first liquid discharge end 2B of the condenser 2. The ejector 3 ejects the high-speed gas through its core component nozzle and enters the mixing chamber, where it mixes with the surrounding low-speed refrigerant liquid. Through the mixing effect of the boundary, the high-speed gas transfers its energy to the low-speed refrigerant liquid, and finally forms a uniform mixture and transmits it to the input end 4A of the gas-liquid separator 4.

[0077] In some embodiments, Figure 7As shown, the refrigeration system 100 further includes: a fourth exhaust pipeline 131 from the exhaust end 4C of the gas-liquid separator 4 to the first air inlet end 5C of the evaporator 5. The fourth exhaust pipeline 131 is provided with a third valve 23.

[0078] The fourth exhaust pipe 131 belongs to the bearing lubrication circuit 110 .

[0079] In some embodiments, the third valve 23 is an electric valve.

[0080] The refrigerant gas-liquid mixture is separated in the gas-liquid separator 4, the refrigerant gas returns to the evaporator 5 from the exhaust end 4C of the gas-liquid separator to the fourth exhaust pipeline 131 of the first air inlet end 5C of the evaporator 5, and the refrigerant liquid enters the motor bearing through the fourth liquid supply pipeline 114 from the output end 4B of the gas-liquid separator 4 to the liquid inlet end 1B of the compressor 1 to lubricate the bearing.

[0081] In some embodiments, Figure 8 As shown, the fourth liquid supply pipeline 114 from the output end 4B of the gas-liquid separator 4 to the liquid inlet end 1B of the compressor 1 includes: a first branch pipeline 121 and a second branch pipeline 122 .

[0082] The first branch pipeline 121 is arranged at the bottom of the gas-liquid separator 4, and the second branch pipeline 122 is arranged in the middle of the gas-liquid separator 4; the first branch pipeline 121 and the second branch pipeline 122 are connected in parallel. The first branch pipeline 121 mainly relies on gravity to supply liquid.

[0083] The first branch pipeline 121 is provided with a first valve 21 , and the second branch pipeline 122 is provided with a second valve 22 .

[0084] In some embodiments, the first valve 21 and the second valve 22 are both electric valves.

[0085] like Figure 8 As shown, the gas-liquid separator 4 is also provided with a refrigerant filling valve 41, and the user can inject the refrigerant into the gas-liquid separator via the refrigerant filling valve to supply liquid to the bearing.

[0086] A liquid level switch 42 is also provided on the gas-liquid separator 4 ; a one-way valve 43 is also provided before the input end of the gas-liquid separator 4 . The liquid level switch 42 is located above the first branch pipeline 121 .

[0087] The specific operation logic is as follows:

[0088] S1. When the refrigeration system is charged with refrigerant for the first time, the first valve 21 and the second valve 22 need to be closed. The refrigerant charging valve 41 on the gas-liquid separator 4 is used to fill the gas-liquid separator with refrigerant.

[0089] S2. During the startup phase, first open the first valve 21 below the gas-liquid separator and the third valve 23 above the gas-liquid separator.

[0090] The refrigerant liquid in the gas-liquid separator flows into the compressor bearings under the action of gravity to lubricate the bearings.

[0091] S3. After a certain period of time after the machine is turned on, the liquid level in the gas-liquid separator is detected according to the liquid level switch on the gas-liquid separator.

[0092] If the liquid level can be detected, that is, the liquid level meets the safety liquid level requirement, the second valve 22 is opened and the first valve 21 is closed, and the refrigerant liquid is provided to the bearing through the second branch pipeline 122 .

[0093] S4. After the unit is shut down, the first valve 21, the second valve 22 and the third valve 23 are closed.

[0094] The liquid level from the outlet point of the second branch pipeline 122 to the bottom height will be stored in the gas-liquid separator, and will be used as the source of bearing lubrication liquid before startup next time. The startup valve action steps are S1-S3.

[0095] like Fig. 9 As shown, in some embodiments, a ball valve 32 is provided on the second exhaust line 112 from the exhaust end 1A of the compressor 1 to the second input end 3B of the ejector 3 .

[0096] The main functions of a ball valve include cutting off flow, distributing flow rate, and changing flow direction. It is switched on and off by rotating the ball, usually 90 degrees, but also 180 degrees or 360 degrees, to control the flow of media (such as water, air, or gas). The design of the ball valve makes it simple in structure, small in size, and light in weight. It also has good sealing, is easy to operate, and can be opened and closed quickly. In addition, the ball valve also has the advantage of low fluid resistance. A full-diameter ball valve has basically no flow resistance, which is suitable for occasions that require precise flow regulation and control.

[0097] like Fig. 9 As shown, in some embodiments, a liquid level sensor 31 is provided in the condenser 2. During the startup phase, the liquid level of the condenser is determined in real time by the liquid level sensor.

[0098] In some embodiments, Fig.10 As shown, a hot gas bypass valve HV is provided on the connecting pipe 118 from the output end 2D of the condenser 2 to the input end 5D of the evaporator 5. The hot gas bypass valve HV is used to balance the pressure and can also be used to balance the refrigerant.

[0099] An air supply valve GV is provided on the air supply pipeline 103 from the air supply end 6A of the economizer 6 to the air intake end 1E of the compressor 1; a first electric valve EV1 is provided on the first liquid supply pipeline 105 from the second liquid discharge end 2C of the condenser 2 to the liquid inlet end 6B of the economizer 6, and a second electric valve EV2 is provided on the liquid return pipeline 106 from the liquid discharge end 6C of the economizer 6 to the liquid inlet end 5E of the evaporator 5.

[0100] In some embodiments, Fig.11 As shown, the first liquid supply pipeline 105 from the second liquid discharge end 2C of the condenser 2 to the liquid inlet end 6B of the economizer 6 is also provided with a first orifice plate 33, and the return liquid pipeline 106 from the liquid discharge end 6C of the economizer 6 to the liquid inlet end 5E of the evaporator 5 is also provided with a second orifice plate 34.

[0101] In some embodiments, Fig.12 As shown, the refrigeration system 100 further includes a heat exchanger 7 .

[0102] The evaporator 5 further includes a second air inlet end 5F.

[0103] The heat exchanger 7 includes a first input end 7A, a second input end 7B, a first output end 7C and a second output end 7D.

[0104] The first input end 7A of the heat exchanger 7 is connected to the output end 4B of the gas-liquid separator 4, the second input end 7B of the heat exchanger 7 is connected to the first liquid discharge end 2B of the condenser 2, the first output end 7C of the heat exchanger 7 is connected to the liquid inlet end 1B of the compressor 1, and the second output end 7D of the heat exchanger 7 is connected to the second gas inlet end 5F of the evaporator 5.

[0105] It should be noted that the refrigeration system 100 mainly applies energy to the refrigerant vapor through the compressor 1 to increase its pressure and temperature. After condensation and throttling, it becomes a low-pressure medium. The low-temperature refrigerant liquid evaporates in the evaporator 5 and absorbs heat from the surrounding environment (refrigerant) to reduce the refrigerant temperature, thereby achieving the purpose of refrigeration.

[0106] In some embodiments, the heat exchanger is a plate heat exchanger. The working principle of the plate heat exchanger is mainly based on the principle of heat transfer. During operation, the high-temperature fluid and the low-temperature fluid pass through the two sides of the plate heat exchanger respectively, and use the space between the plates to exchange heat. This heat exchange can be achieved through wall heat conduction and convection formed by the fluid on the wall surface, thereby promoting effective heat exchange between two fluids of different temperatures. Specifically, the working fluid will flow through the channel between the two plates, and the intermediate plate separates the hot and cold fluids, and heat exchange is carried out on this plate. The material of the plate has good thermal conductivity, so that heat can be quickly conducted through the plate. The plate heat exchanger realizes an efficient and compact heat exchange process by using the space between the plates for heat exchange, combined with good thermal conductivity and an effective fluid distribution system.

[0107] like Fig.13 As shown, Fig.13 The compressor 1 is a basic structure of a compressor, and includes: a suction guide vane 8, a shaft 9, a first-stage impeller 10, a second-stage impeller 11, a motor 12, a diffuser 13 and a return fluid 14.

[0108] The function of the suction guide vane 8 is to change the absolute velocity direction of the airflow entering the impeller, thereby changing the gas flow entering the impeller.

[0109] The first-stage impeller 10 and the second-stage impeller 11 include a wheel disc, a wheel cover and blades. Under the action of the impeller blades, the gas rotates at high speed with the impeller. The gas is affected by the centrifugal force of the rotation and the expansion pressure flow in the impeller, so that the pressure after passing through the impeller is increased. For example, the first-stage impeller 10 and the second-stage impeller 11 are successively placed and installed on the main shaft of the motor 12, and rotate with the rotation of the main shaft of the motor 12.

[0110] The main function of the diffuser 13 is to convert the kinetic energy of the airflow at the impeller outlet into pressure energy.

[0111] The function of the shaft 9 is to support the components (impeller) mounted thereon and to transmit torque.

[0112] Solution 2: In some embodiments, Fig.14 As shown, when the refrigeration system 100 includes the heat exchanger 7 , the refrigeration system 100 also includes: a refrigeration cycle circuit 101 .

[0113] The refrigeration cycle 101 includes: an air intake pipeline 102 from the exhaust end 5A of the evaporator 5 to the air intake end 1D of the compressor 1; an air supply pipeline 103 from the air supply end 6A of the economizer 6 to the air intake end 1E of the compressor 1; a first exhaust pipeline 104 from the exhaust end 1A of the compressor 1 to the air intake end 2A of the condenser 2; a first liquid supply pipeline 105 from the second liquid discharge end 2C of the condenser 2 to the liquid inlet end 6B of the economizer 6; a liquid return pipeline 106 from the liquid discharge end 6C of the economizer 6 to the liquid inlet end 5E of the evaporator 5; and a connecting pipeline 118 from the output end 2D of the condenser 2 to the input end 5D of the evaporator 5.

[0114] Among them, the above-mentioned refrigeration cycle loop 101 refers to: low-temperature and low-pressure gaseous refrigerant is evaporated from the evaporator 5, and the low-temperature and low-pressure gaseous refrigerant is transmitted to the compressor 1 through the suction pipeline 102 from the exhaust end 5A of the evaporator 5 to the suction end 1D of the compressor 1, and the first-stage impeller 10 in the compressor 1 compresses the low-temperature and low-pressure gaseous refrigerant.

[0115] The medium-temperature and medium-pressure saturated gas obtained from the economizer 6 is transmitted to the compressor 1 through the air supply pipeline 103 from the air supply end 6A of the economizer 6 to the air inlet end 1E of the compressor 1. The compressor 1 mixes the low-temperature and low-pressure gaseous refrigerant compressed by the first-stage impeller 10 with the medium-temperature and medium-pressure saturated gas, and compresses it through the second-stage impeller 11 to finally obtain a high-temperature and high-pressure gaseous refrigerant.

[0116] Compressor 1 transmits high-temperature and high-pressure gaseous refrigerant to condenser 2 through the first exhaust pipe 104 from the exhaust end 1A of compressor 1 to the intake end 2A of condenser 2; the high-temperature and high-pressure gaseous refrigerant will be cooled by the cooling water in condenser 2 and phase-changed into high-temperature and high-pressure liquid refrigerant.

[0117] High-temperature and high-pressure liquid refrigerant is transmitted to the economizer 6 through the first liquid supply pipeline 105 from the second liquid discharge end 2C of the condenser 2 to the liquid inlet end 6B of the economizer 6; the high-temperature and high-pressure liquid refrigerant is separated into liquid refrigerant and flashed gaseous refrigerant in the economizer 6; the gaseous refrigerant is transmitted to the compressor 1 through the air supply pipeline 103 from the air supply end 6A of the economizer 6 to the air inlet end 1E of the compressor 1, and the liquid refrigerant is transmitted to the evaporator 5 through the liquid return pipeline 106 from the liquid discharge end 6C of the economizer 6 to the liquid inlet end 5E of the evaporator 5; the liquid refrigerant is evaporated through the evaporator 5 to obtain a low-temperature and low-pressure gaseous refrigerant, and then the low-temperature and low-pressure gaseous refrigerant is transmitted to the compressor 1 through the air intake pipeline 102 from the exhaust end 5A of the evaporator 5 to the air intake end 1D of the compressor 1, and finally a refrigeration cycle 101 is formed.

[0118] In some embodiments, Fig.14 As shown, the refrigeration system further includes a bearing lubrication circuit 110 .

[0119] The bearing lubrication circuit 110 includes: a second liquid supply line 111 from the first liquid discharge end 2B of the condenser 2 to the first input end 3A of the ejector 3; a second exhaust line 112 from the exhaust end 1A of the compressor 1 to the second input end 3B of the ejector 3; a third liquid supply line 113 from the output end 3C of the ejector 3 to the input end 4A of the gas-liquid separator 4; a fourth liquid supply line 114 from the output end 4B of the gas-liquid separator 4 to the first input end 7A of the heat exchanger 7; and a fourth liquid supply line 115 from the first output end 4C of the heat exchanger 7 to the first input end 7A of the heat exchanger 7. A fifth liquid supply pipeline 115 from the first liquid discharge end 2B of the condenser 2 to the second input end 7B of the heat exchanger 7; a return air pipeline 117 from the second output end 7D of the heat exchanger 7 to the second air inlet end 5F of the evaporator 5; a fourth exhaust pipeline 131 from the exhaust end 4C of the gas-liquid separator 4 to the first air inlet end 5C of the evaporator 5; and a low-pressure return air pipeline 135 from the return air end 1C of the compressor 1 to the return air end 5B of the evaporator 5.

[0120] An electronic expansion valve 35 is provided on the sixth liquid supply pipeline 116 from the first liquid discharge end 2B of the condenser 2 to the second input end 7B of the heat exchanger 7 .

[0121] The bearing lubrication circuit 110 is as follows: a pipeline is drawn from the first exhaust pipeline 104 from the exhaust end 1A of the compressor 1 to the suction end 2A of the condenser 2, that is, the second exhaust pipeline 112 is connected to the second input end 3B of the ejector 3, and the liquid end of the ejector 3 is connected to the bottom of the condenser. The high-speed gas on the exhaust side is ejected through the pipeline 106 to draw the refrigerant liquid at the bottom of the condenser through the filter and then merge with the refrigerant gas drawn from the exhaust side in the ejector, and then enter the gas-liquid separator 4 through the third liquid supply pipeline 113. The refrigerant gas-liquid mixture is separated in the gas-liquid separator 4, and the refrigerant gas returns to the evaporator 5 from the fourth exhaust pipeline 131 at the upper part of the gas-liquid separator, and the refrigerant liquid enters the heat exchanger 7 from the first branch pipeline 121 and the second branch pipeline 122 at the lower part of the gas-liquid separator.

[0122] The auxiliary circuit of the heat exchanger 7 is a sixth liquid supply line 116 from the first liquid discharge end 2B of the condenser 2 to the second input end 7B of the heat exchanger 7 and a return air line 117 from the second output end 7D of the heat exchanger 7 to the second air inlet end 5F of the evaporator 5. This auxiliary circuit is supplied with liquid by the condenser 2 by means of a pressure difference. An electronic expansion valve 35 is arranged in the sixth liquid supply line 116 from the first liquid discharge end 2B of the condenser 2 to the second input end 7B of the heat exchanger 7 to throttle the refrigerant liquid. The phase change of the refrigerant after throttling is utilized to exchange heat with the refrigerant in the fourth liquid supply line 114 from the output end 4B of the gas-liquid separator 4 to the first input end 7A of the heat exchanger 7 in the heat exchanger to supercool the refrigerant. The refrigerant in the sixth liquid supply line 116 returns to the evaporator 5 after heat exchange, and the refrigerant in the fourth liquid supply line 114 enters the compressor bearing to lubricate the bearing.

[0123] In some embodiments, Fig.14 As shown, a first filter 51 is provided on the second liquid supply pipeline from the first liquid discharge end 2B of the condenser 2 to the first input end of the ejector 3 .

[0124] In some embodiments, Fig.14 As shown, the fifth liquid supply pipeline 115 from the first output end 7C of the heat exchanger 7 to the liquid inlet end 1B of the compressor 1 includes: a third branch pipeline 123 , a fourth branch pipeline 124 and a fifth branch pipeline 125 .

[0125] The third branch pipeline 123 is provided with a first sensor 52 , the fourth branch pipeline 124 is provided with a second filter 53 ; the fifth branch pipeline 125 is provided with a second sensor 54 , a third sensor 55 and a fourth sensor 56 .

[0126] The third branch pipeline 123 is connected in parallel with the fourth branch pipeline 124. The second filter 53 is a precision filter, the first sensor is a differential pressure sensor, the second sensor 54 is a pressure sensor, the third sensor 55 is a temperature sensor, and the fourth sensor 56 is a flow sensor.

[0127] The fourth sensor 56 is configured to monitor lubrication flow.

[0128] The fifth branch pipeline 125 includes a sixth branch pipeline 126 and a seventh branch pipeline 127 .

[0129] The sixth branch pipe 126 is connected to the front bearing of the compressor 1 , and the seventh branch pipe 127 is connected to the rear bearing of the compressor 1 .

[0130] In some embodiments, Fig.14 As shown, the fifth branch pipeline 125 is further provided with a first sight mirror 57 .

[0131] The parameters collected by the second sensor 54 and the third sensor 55 are used to calculate the subcooling degree in the PLC and then adjust the opening of the electronic expansion valve 35 to ensure that the refrigerant entering the bearing is pure liquid and prevent cavitation from having a negative impact on the bearing life.

[0132] In some embodiments, Fig.15 As shown, the refrigeration system further includes: a first pump 61 ; the first pump 61 is arranged on a sixth liquid supply pipeline 116 from the first liquid discharge end 2B of the condenser 2 to the second input end 7B of the heat exchanger 7 .

[0133] A first pump 61 is arranged on the sixth liquid supply pipeline 116 from the first liquid discharge end 2B of the condenser 2 to the second input end 7B of the heat exchanger 7. The first pump 61 can provide refrigerant liquid supply power for the sixth liquid supply pipeline 116 for supplying liquid to the bearing during the startup phase. While the refrigerant in the gas-liquid separator 4 enters the bearing by gravity, the liquid entering the bearing is heat exchanged in advance to make it supercooled, thereby preventing the refrigerant entering the bearing from being partially vaporized at this time, causing cavitation to the bearing when the compressor just starts to run.

[0134] At the same time, during the operation stage, the use of a variable frequency pump can adjust the liquid supply volume of the sixth liquid supply pipeline 116 and thus adjust the liquid supply subcooling. When the auxiliary line liquid supply flow is insufficient under low pressure ratio conditions, the flow rate can be adjusted to increase the refrigerant flow rate of the sixth liquid supply pipeline 116, so that the lubrication liquid supply to the bearing is pure liquid from startup to operation, avoiding the possibility of cavitation throughout the entire cycle and extending the service life of the bearing.

[0135] The above are only specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An air conditioning system, characterized in that: The air conditioning system comprises: A refrigeration system, the refrigeration system comprising: compressor; A condenser, wherein the suction end of the condenser is connected to the exhaust end of the compressor; An evaporator, wherein the exhaust end of the evaporator is connected to the suction end of the compressor, and the return end of the evaporator is connected to the return end of the compressor; An ejector, wherein a first input end of the ejector is connected to a first liquid discharge end of the condenser, and a second input end of the ejector is connected to an exhaust end of the compressor; A gas-liquid separator, wherein the input end of the gas-liquid separator is connected to the output end of the ejector, the output end of the gas-liquid separator is connected to the liquid inlet end of the compressor, and the exhaust end of the gas-liquid separator is connected to the first air inlet end of the evaporator.

2. The air conditioning system according to claim 1, characterized in that: The refrigeration system further comprises: An economizer, wherein the air supply end of the economizer is connected to the air inlet end of the compressor; the liquid inlet end of the economizer is connected to the second liquid discharge end of the condenser; and the liquid discharge end of the economizer is connected to the liquid inlet end of the evaporator; Wherein, the input end of the evaporator is connected to the output end of the condenser.

3. The air conditioning system according to claim 2, characterized in that: The refrigeration system further comprises: a refrigeration cycle circuit; The refrigeration cycle loop includes: an air intake pipeline from the exhaust end of the evaporator to the air intake end of the compressor; an air supply pipeline from the air supply end of the economizer to the air intake end of the compressor; a first exhaust pipeline from the exhaust end of the compressor to the air intake end of the condenser; a first liquid supply pipeline from the second liquid discharge end of the condenser to the liquid inlet end of the economizer; a liquid return pipeline from the liquid discharge end of the economizer to the liquid inlet end of the evaporator; and a connecting pipeline from the output end of the condenser to the input end of the evaporator.

4. The air conditioning system according to claim 3, characterized in that: The refrigeration system further comprises: a bearing lubrication circuit; The bearing lubrication circuit includes: a second liquid supply pipeline from the first discharge end of the condenser to the first input end of the ejector; a second exhaust pipeline from the exhaust end of the compressor to the second input end of the ejector; a third liquid supply pipeline from the output end of the ejector to the gas-liquid separator; a fourth liquid supply pipeline from the output end of the gas-liquid separator to the liquid inlet end of the compressor; and a low-pressure return air pipeline from the return air end of the compressor to the return air end of the evaporator.

5. The air conditioning system according to claim 2, characterized in that: The refrigeration system further comprises: a heat exchanger; The first input end of the heat exchanger is connected to the output end of the gas-liquid separator, the second input end of the heat exchanger is connected to the first liquid discharge end of the condenser, the first output end of the heat exchanger is connected to the liquid inlet end of the compressor, and the second output end of the heat exchanger is connected to the air inlet end of the evaporator.

6. The air conditioning system according to claim 5, characterized in that: In the case where the refrigeration system includes the heat exchanger, the refrigeration system further includes: a bearing lubrication circuit; The bearing lubrication circuit includes: a second liquid supply pipeline from the first discharge end of the condenser to the first input end of the ejector; a second exhaust pipeline from the exhaust end of the compressor to the second input end of the ejector; a third liquid supply pipeline from the output end of the ejector to the gas-liquid separator; a fourth liquid supply pipeline from the output end of the gas-liquid separator to the first input end of the heat exchanger; a fifth liquid supply pipeline from the first output end of the heat exchanger to the liquid inlet end of the compressor; a sixth liquid supply pipeline from the first discharge end of the condenser to the second input end of the heat exchanger; a return air pipeline from the second output end of the heat exchanger to the air inlet end of the evaporator; and a low-pressure return air pipeline from the return air end of the compressor to the return air end of the evaporator.

7. The air conditioning system according to claim 5, characterized in that: A fourth liquid supply pipeline from the output end of the gas-liquid separator to the first input end of the heat exchanger includes: a first branch pipeline and a second branch pipeline; Wherein, the first branch pipeline is arranged at the bottom of the gas-liquid separator, and the second branch pipeline is arranged in the middle of the gas-liquid separator; the first branch pipeline and the second branch pipeline are connected in parallel; The first branch pipeline is provided with a first valve, and the second branch pipeline is provided with a second valve; The refrigeration system further includes: a fourth exhaust pipeline from the exhaust end of the gas-liquid separator to the air inlet end of the evaporator; and a third valve is arranged on the fourth exhaust pipeline.

8. The air conditioning system according to claim 5, characterized in that: A fifth liquid supply pipeline from the first output end of the heat exchanger to the liquid inlet end of the compressor comprises: a third branch pipeline, a fourth branch pipeline and a fifth branch pipeline; The third branch pipeline is provided with a first sensor, the fourth branch pipeline is provided with a second filter; the fifth branch pipeline is provided with a second sensor, a third sensor and a fourth sensor; Wherein, the third branch pipeline is connected in parallel with the fourth branch pipeline.

9. The air conditioning system according to claim 8, characterized in that: The fifth branch pipeline includes: a sixth branch pipeline and a seventh branch pipeline; the sixth branch pipeline is connected to the front bearing of the compressor, and the seventh branch pipeline is connected to the rear bearing of the compressor.

10. The air conditioning system according to claim 5, characterized in that: The refrigeration system further comprises: a first pump; The first pump is arranged on a sixth liquid supply pipeline from the first liquid discharge end of the condenser to the second input end of the heat exchanger; The sixth liquid supply pipeline from the first liquid discharge end of the condenser to the second input end of the heat exchanger is also provided with an electronic expansion valve.

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