CN220083361U

CN220083361U - Air conditioning system

Info

Publication number: CN220083361U
Application number: CN202320330384.8U
Authority: CN
Inventors: 孟庆良; 何建奇; 顾超; 刘江彬
Original assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Priority date: 2023-02-27
Filing date: 2023-02-27
Publication date: 2023-11-24
Anticipated expiration: 2033-02-27

Abstract

The utility model provides an air conditioning system which comprises a first branch, a second branch, a third branch, a first bypass pipeline and a flow path control device, wherein the first branch, the second branch, the third branch, the first bypass pipeline and the flow path control device are arranged in parallel. The first branch includes an ejector and a condenser disposed downstream of the ejector. The second branch includes a compressor, a gas-liquid separator disposed upstream of the compressor, and an oil separator downstream of the compressor. The third branch is configured to absorb external heat to heat the working medium in the third branch. An inlet of the first bypass pipeline is communicated with an outlet of the second branch pipeline, and an outlet of the first bypass pipeline is communicated with an inlet of the condenser. The flow path control device is configured to open or close at least the first bypass passage. The air conditioning system of the utility model realizes refrigeration by utilizing energy sources such as building waste heat, industrial waste heat or solar energy in the refrigeration air conditioning system, thereby saving energy sources and realizing energy conservation and carbon reduction.

Description

Air conditioning system

Technical Field

The utility model relates to the technical field of air conditioning, in particular to an air conditioning system.

Background

In general, an air conditioning system provides energy for movement of working media in the air conditioning system by acting through a compressor, and the energy efficiency of the air conditioning system is difficult to improve. The energy consumption of the air conditioning system can be obviously reduced if the energy efficiency of the air conditioning system can be improved, and further, the carbon emission is reduced. At present, the utilization of building waste heat or industrial waste heat is concentrated on the utilization of waste heat for heating, and waste heat resources are often more in summer, so that the energy efficiency of the air conditioning system can be improved if the air conditioning system can fully utilize the waste heat in summer, thereby reducing the energy consumption of the air conditioning system and saving energy sources to a greater extent.

Disclosure of Invention

The present utility model has been made in view of the above problems, and an object of the present utility model is to provide an air conditioning system that overcomes or at least partially solves the above problems, and is capable of performing cooling using building waste heat or industrial waste heat to reduce work of a compressor, thereby saving energy.

Specifically, the present utility model provides an air conditioning system comprising:

a first branch comprising an ejector and a condenser disposed downstream of the ejector;

a second branch for refrigeration, the second branch comprising a compressor, and a gas-liquid separator arranged upstream of the compressor and/or an oil separator arranged downstream of the compressor;

the third branch is configured to heat working media in the third branch by using external heat;

the outlet of the second branch is communicated with the first inlet of the ejector, and the inlet of the second branch is communicated with the outlet of the first branch;

the outlet of the third branch is communicated with the second inlet of the ejector, and the inlet of the third branch is communicated with the outlet of the first branch;

the working medium pressure at the second inlet is greater than the working medium pressure at the first inlet;

the air conditioning system further includes:

a first bypass line, an inlet of the first bypass line being in communication with an outlet of the second branch, an outlet of the first bypass line being in communication with an inlet of the condenser;

and a flow path control device configured to open or close at least the first bypass passage.

Optionally, the second branch further comprises an evaporator;

the evaporator is disposed upstream of the compressor, and is configured to absorb heat from a user space for cooling.

Optionally, the air conditioning system further comprises a second bypass line;

an inlet of the second bypass pipeline is communicated with an outlet of the evaporator, and an outlet of the second bypass pipeline is communicated with the first inlet;

the second bypass pipeline is provided with a first stop valve, and the first stop valve is used for opening or closing the second bypass pipeline.

Optionally, the flow path control device includes a second shut-off valve provided on the first bypass line, the second shut-off valve opening or closing the first bypass line;

the flow path control device further comprises a third stop valve, and the third stop valve is arranged between the outlet of the second branch and the first inlet so as to enable the outlet of the second branch to be communicated with or disconnected from the first inlet.

Optionally, the third branch comprises a heat collecting device;

the heat collecting device is used for absorbing external heat to heat working media in the third branch.

Optionally, the second branch further comprises a throttling device arranged upstream of the evaporator.

Optionally, the third branch further comprises a working medium pump connected upstream or downstream of the heat collecting device.

Optionally, the heat collecting device is an evaporative heat exchanger.

Optionally, the throttling device is an electronic expansion valve.

Optionally, the outlet of the condenser is the outlet of the first branch;

the outlet of the oil separator is the outlet of the second branch;

the outlet of the heat collecting device is the outlet of the third branch.

In the air conditioning system, external energy sources such as building waste heat, industrial waste heat or solar energy are utilized to apply work to the outside in the air conditioning system, and the energy sources which are rarely utilized before are utilized, so that the energy sources are saved, and the energy conservation and the carbon reduction are realized. Meanwhile, under the condition of insufficient external energy, the normal refrigeration of the air conditioning system can be guaranteed, so that the adaptability of the air conditioning system is improved.

Further, the gas-liquid separator arranged at the upstream of the compressor can avoid the damage of parts of the compressor caused by the liquid working medium entering from the air inlet of the compressor. The oil separator arranged at the downstream of the compressor can prevent lubricating oil from entering the pipeline of the whole air conditioning system and the parts forming the air conditioning system, so that the refrigerating effect of the air conditioning system is improved.

Further, through the arrangement of the working medium pump, the flow speed of the liquid working medium of the third branch circuit can be improved, the flow time is shortened, and the heat exchange efficiency is improved.

The above, as well as additional objectives, advantages, and features of the present utility model will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present utility model when read in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the utility model will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:

FIG. 1 is a schematic diagram of an air conditioning system according to one embodiment of the present utility model;

fig. 2 is a schematic view of an air conditioning system according to an embodiment of the present utility model.

Detailed Description

An air conditioning system according to an embodiment of the present utility model will be described with reference to fig. 1 and 2. Where the terms "front", "rear", "upper", "lower", "top", "bottom", "inner", "outer", "transverse", etc., refer to an orientation or positional relationship based on that shown in the drawings, this is merely for convenience in describing the utility model and to simplify the description, and does not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the utility model.

The terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may include at least one, i.e. one or more, of the feature, either explicitly or implicitly. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. When a feature "comprises or includes" a feature or some of its coverage, this indicates that other features are not excluded and may further include other features, unless expressly stated otherwise.

Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured," "coupled," and the like should be construed broadly, as they are, for example, fixedly connected, detachably connected, or as a unit. Either mechanically or electrically. Either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. Those of ordinary skill in the art will understand the specific meaning of the terms described above in the present utility model as the case may be.

In the description of the present embodiment, a description referring to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The utility model provides an air conditioning system. An air conditioning system is a system that artificially treats the temperature, humidity, cleanliness, and air flow rate of indoor air. Can make certain places obtain air with certain temperature, humidity or air quality so as to meet the requirements of users and production processes and improve the labor sanitation and indoor air condition.

Under the large background of reducing carbon emission, the energy efficiency of the air conditioning system can be improved, so that the energy consumption of the air conditioning system can be obviously reduced, and the carbon emission is further reduced. At present, the utilization of building waste heat or industrial waste heat is concentrated on the utilization of waste heat for heating, and waste heat resources are often more in summer, so that the energy efficiency of the air conditioning system can be improved if the air conditioning system can fully utilize the waste heat in summer, thereby reducing the energy consumption of the air conditioning system and saving energy sources to a greater extent.

The air conditioning system of the present specification is mainly used for adjusting the temperature of a user space. Fig. 1 is a schematic view of an air conditioning system according to an embodiment of the present utility model, and referring to fig. 2, the air conditioning system according to an embodiment of the present utility model includes a first branch line 10, a second branch line 20, and a third branch line 30, a first bypass line 40, and a flow path control device. The first branch 10 comprises an ejector 11 and a condenser 12 arranged downstream of the ejector 11. The second branch 20 for refrigeration comprises a compressor 24, as well as a gas-liquid separator 23 arranged upstream of the compressor 24 and an oil separator 25 arranged downstream of the compressor 24. The third branch 30 is configured to absorb external heat to heat the working medium in the third branch 30. The outlet of the second branch 20 communicates with the first inlet of the ejector 11, and the inlet of the second branch 20 communicates with the outlet of the first branch 10. The outlet of the third branch 30 communicates with the second inlet of the ejector 11, and the inlet of the third branch 30 communicates with the outlet of the first branch 10. The working medium pressure at the second inlet is greater than the working medium pressure at the first inlet. The inlet of the first bypass line 40 communicates with the outlet of the second branch, and the outlet of the first bypass line 40 communicates with the inlet of the condenser 12. The flow path control device is configured to open or close at least the first bypass passage.

The ejector 11 is also called a jet pump or an evacuator, and the ejector 11 is a pump that delivers a fluid by using the jet action of a high-pressure working fluid. The ejector mixes two fluids with different pressures with each other to exchange energy and form a mixed fluid without directly consuming mechanical energy. The ejector 11 has two inlets, one of which is connected to a high-pressure fluid, which is an injection fluid, and the other of which is connected to a low-pressure fluid, which is an injected fluid. In an air conditioning system, the condenser 12 is one of the primary heat exchange devices capable of transferring heat from a hot fluid at a higher temperature to another cold fluid at a lower temperature. After the working medium from the ejector 11 enters the condenser 12, heat is transferred to the surrounding medium, and the gaseous working medium is condensed into saturated liquid or further cooled into supercooled liquid. The condenser may be classified into an air-cooled condenser, a water-cooled condenser, and a hybrid condenser according to a cooling medium and a cooling manner. The condenser in this specification may be any one of an air-cooled condenser, a water-cooled condenser, and a hybrid condenser according to a specific use scenario. The compressor 24 is a fluid machine that lifts low-pressure gas into high-pressure gas, and is the heart of an air conditioning system, and the compressor is used to realize continuous circulation flow of working medium in the air conditioning system. The compressor 24 sucks low-temperature and low-pressure gas working medium from the air inlet, compresses the gas working medium through motor operation, and then discharges high-temperature and high-pressure gas working medium from the air outlet of the compressor 24 to provide power for working medium circulation. The gas-liquid separator mainly separates the mixed gas and liquid working medium, collects the liquid working medium and prevents the liquid accumulation of the compressor 24. When the high temperature and high pressure gas working fluid passes through the compressor 24, part of the lubricating oil in the compressor 24 is heated to be oil vapor, and excessive oil enters the evaporator 22 to raise the evaporating temperature, so that the evaporating amount and the refrigerant are reduced. The oil separation device is used for separating out the lubricating oil mixed in the gas working medium, thereby reducing the amount of the lubricating oil entering the air conditioning system.

The first branch 10, the second branch 20 and the third branch 30 in the present air conditioning system have different functions. The primary function of the first branch 10 is to drain the working medium of the second branch 20 through the ejector 11, the first branch 10 further comprising a condenser 12 arranged downstream of the ejector 11. The main function of the second branch 20 is to absorb heat from the user space for cooling the user space. The third branch 30 mainly functions to absorb external heat, which may be the roof of a building, solar energy, non-user space in the building or non-user space in a factory, etc., and waste heat of the building or factory. The heat absorbed by the third branch 30 causes the working medium in the third branch 30 to become a high-temperature and high-pressure gas. The working fluid in the second branch 20 is compressed by the compressor 24 and is also a high-temperature and high-pressure gas, but the pressure of the working fluid passing through the third branch 30 is greater than the pressure of the working fluid at the exhaust port of the compressor 24, that is, the pressure of the working fluid at the second inlet is greater than the pressure of the working fluid at the first inlet. When the air conditioning system is in operation, the working fluid after passing through the third branch 30 enters the second inlet of the ejector 11 as high pressure fluid to eject the opposite low pressure fluid working fluid at the exhaust port of the compressor 24 in communication with the first inlet of the ejector 11, thereby driving the working fluid through the ejector 11. The outlet of the condenser 12 through which the working fluid flowing out of the outlet of the ejector is the outlet of the first branch 10. That is, a part of the working fluid flowing out from the outlet of the condenser 12 enters the second branch 20 communicating with the outlet of the first branch 10, and the remaining part enters the third branch 30 communicating with the outlet of the first branch 10, thereby achieving circulation of the working fluid in the entire air conditioning system. In the air conditioning system, the ejector 11 and the compressor 24 cooperate to drive the working medium to run in the air conditioning system, and compared with the traditional method that the working medium is driven to run in the air conditioning system by only relying on the compressor, the ejector and the compressor cooperate to drive the working medium to run in the air conditioning system can reduce the compression ratio of the compressor 24, reduce the power consumption of the compressor 24, and consume less energy under the same refrigeration capacity. On the premise that the air conditioning system ensures the normal temperature regulation function, external energy sources such as building waste heat, industrial waste heat or solar energy and the like are utilized to apply work to the outside in the air conditioning system, the energy sources which are rarely utilized before are utilized, the energy sources are saved, and the energy conservation and the carbon reduction are realized. The above-mentioned operation is performed under the condition of sufficient waste heat, and when the preheating is insufficient or even no waste heat is present, the ejector 11 cannot operate, and in order to ensure that the air conditioning system can still complete the cooling of the user space, the air conditioning system in this embodiment is further provided with a first bypass line 40. When the preheating is insufficient and even no residual heat is present, the heat collecting device cannot absorb enough heat to raise the pressure of the working medium in the third branch 30 sufficiently to eject the working medium in the second branch, at this time, the ejector 11 does not work, the flow path control device controls the first bypass line 40 to open, the compressor 24 discharges the working medium, and then the working medium enters the condenser 12 through the first bypass line 40 and then passes through the second branch, thereby completing the whole refrigeration cycle.

The device realizes the external work application by utilizing external energy sources such as building waste heat, industrial waste heat or solar energy in the air conditioning system, utilizes the energy which is rarely utilized before, saves the energy and realizes energy conservation and carbon reduction. Meanwhile, under the condition of insufficient external energy, the normal refrigeration of the air conditioning system can be guaranteed, so that the adaptability of the air conditioning system is improved.

Further, by the gas-liquid separator 23 provided upstream of the compressor 24, it is possible to avoid damage to parts of the compressor 24 caused by the working medium entering the liquid state from the intake port of the compressor 24. By the oil separator 25 disposed downstream of the compressor 24, it is possible to prevent lubricating oil from entering the whole air conditioning system and the components constituting the air conditioning system, thereby improving the refrigerating effect of the air conditioning system.

In some embodiments of the utility model, the second branch 20 further comprises a gas-liquid separator 23 arranged upstream of the compressor 24. That is, the gas-liquid separator 23 is located in front of the compressor in the direction in which the working fluid flows.

In some embodiments of the present utility model, the second leg 20 further includes an oil separator 25 disposed downstream of the compressor 24. That is, the oil separator 25 is located at the rear of the compressor in the direction in which the working fluid flows.

In some embodiments of the present utility model, the second leg 20 further includes an evaporator 22. An evaporator 22 is provided upstream of the compressor 24, the evaporator 22 being for absorbing heat from the user space for cooling. The evaporator 22 is a heat exchange device that generates and outputs cold in the air conditioning system and absorbs heat from the user space. The evaporator 22 is one of the dividing wall type heat exchangers, the working medium is in a liquid state or a gas-liquid mixed state when entering the evaporator 22, the heat of the user space is absorbed through the heat transfer dividing wall, so that the temperature of the working medium is reduced, and the working medium liquid is boiled under lower pressure and temperature and becomes a gas state. The evaporator 22 is classified into a cooling liquid, a cooling air, a contact type, and the like according to the medium to be cooled. Preferably, the evaporator 22 is of the cooling air type in the embodiment of the present utility model. When the second branch 20 further includes a gas-liquid separator 23 disposed upstream of the compressor 24, the evaporator 22 is located upstream of the gas-liquid separator 23, and the working medium passing through the evaporator 22 enters the gas-liquid separator 23, so that the working medium which is not completely gasified can be prevented from entering the compressor.

In some embodiments of the present utility model, as shown in FIG. 2, the air conditioning system further includes a second bypass line 50. The inlet of the second bypass line 50 communicates with the outlet of the evaporator 22 and the outlet of the second bypass line 50 communicates with the first inlet. The second bypass line 50 is provided with a first shut-off valve 51, and the first shut-off valve 51 is used for opening or closing the second bypass line. When the waste heat is particularly sufficient and the pressure difference between the second inlet and the first inlet can meet the optimal injection ratio, only the ejector 11 is required to work at the moment, the working medium passing through the evaporator 22 is directly communicated with the first inlet through the second bypass pipeline 50, and enters the ejector 11 under the injection of the high-pressure working medium of the second inlet, and then flows out of the outlet of the ejector. In these embodiments, the flow of working fluid in the air conditioning system is completely free of compressor intervention, thereby maximizing energy savings.

In some embodiments of the present utility model, as shown in fig. 2, the flow path control device includes a second shut-off valve provided on the first bypass line, the second shut-off valve opening or closing the first bypass line. When the heat absorbed by the heat collecting device is less than enough to enable the ejector to work, the second stop valve 41 is opened, the first stop valve 51 is closed, the compressor 24 does work, high-temperature and high-pressure gas working medium is discharged, the gas working medium enters the condenser 12 through the first bypass pipeline 40, and then the gas working medium passes through the electronic expansion valve and the evaporator to absorb heat of a user space to refrigerate. Of course, the high-temperature and high-pressure gas working medium discharged from the compressor 24 may also enter the condenser 12 after passing through the ejector 11.

Further, in some embodiments of the present utility model, as shown in fig. 2, the flow path control device further includes a third stop valve 26, and the third stop valve 26 is disposed between the outlet of the second branch and the first inlet, so that the outlet of the second branch is in communication with or is closed off from the first inlet. When the heat absorbed by the heat collecting device is great, so that the pressure difference between the second inlet and the first inlet of the ejector reaches the optimal injection ratio, the second stop valve 41 is closed, the first stop valve 51 and the third stop valve 26 are opened, and the working medium passing through the evaporator 22 directly enters the ejector 11 through the second bypass pipeline 50 and is injected by the high-pressure working medium of the third branch.

In some embodiments of the utility model, the third branch 30 comprises a heat collecting device. The heat collecting device is used for absorbing external heat to heat working medium in the third branch. The heat collecting device is a device for collecting heat. The heat collection device is an evaporative heat exchanger 32. According to different objects for collecting heat, the heat collecting device can be a solar heat collector, and also can be an evaporation type heat exchanger, and according to the needs, the heat collecting device which is suitable can be selected. In this embodiment, the waste heat utilized is mainly from the building, where the heat collector is suitably an evaporative heat exchanger 32. In other embodiments, where the waste heat utilized is primarily from solar energy, the heat collector herein may be a solar collector accordingly.

The evaporative heat exchanger 32 absorbs external heat to convert the working medium flowing through the evaporative heat exchanger 32 from a liquid state to a high-temperature high-pressure gaseous state, so that the working medium flowing through the evaporative heat exchanger and entering the ejector can be used as ejection fluid to eject ejected fluid.

In some embodiments of the utility model, the outlet of the evaporative heat exchanger 32 is the outlet of the third leg 30. That is, the outlet of the evaporative heat exchanger 32 is in communication with the outlet of the third leg 30, either through a conduit or directly without a conduit, such that the working fluid passing through the outlet of the evaporative heat exchanger 32 directly enters the second inlet of the injector 11.

In some embodiments of the present utility model, the working fluid pressure in second branch 20 is lower than the working fluid pressure in third branch 30 to enable proper operation of injector 11.

In some embodiments of the utility model, the second branch 20 further comprises a throttling device arranged upstream of the evaporator 22. The inlet of the throttling means communicates with the inlet of the second branch 20, that is to say the throttling means communicates with the outlet of the condenser 12. The throttle device is the main component of the air conditioning system, and the throttle device in the second branch 20 and the compressor 24 together maintain the pressure difference at the high and low pressure sides, so as to achieve the purpose of refrigeration. The function of the throttling device is to throttle a portion of the saturated liquid (or subcooled liquid) at condensing pressure exiting the condenser 12 to evaporating pressure and evaporating temperature, while regulating the flow of working medium into the evaporator 22 in response to load changes.

Further, in some embodiments of the present utility model, the throttle device of the air conditioning system may be any one of a manual expansion valve, a thermal expansion valve, an electronic expansion valve, a capillary tube, and a float ball regulating valve. Preferably, the throttling means is an electronic expansion valve 21. The electronic expansion valve 21 controls the voltage or current applied to the electronic expansion valve by using the electric signal generated by the adjusted parameter, thereby controlling the action of the electronic expansion valve to achieve the aim of adjustment. The electronic expansion valve 21 has many advantages over the other expansion valves described above: with flow regulation not affected by changes in condensing pressure. The compensation function is provided for the change of the supercooling degree of the working medium liquid before the electronic expansion valve. The electric signal is faster than other signal transmission, so that the actuating element acts rapidly and accurately. The superheat degree of the outlet of the evaporator can be controlled to be minimum, and the utilization rate of the heat transfer area of the evaporator is improved to the greatest extent. The same superheat setting may be present throughout the operating temperature range of the air conditioning system. Advanced control algorithm can be determined according to the actual operation characteristics of the air conditioning system.

In some embodiments of the present utility model, the outlet of the oil separator 25 is the outlet of the second leg 20. When the second branch is provided with an oil separator 25, the exhaust port of the oil separator communicates with the outlet of the second branch 20. When the second branch is not provided with the oil separator 25, the outlet of the compressor is directly connected with the outlet of the second branch through a pipe or not.

In some embodiments of the present utility model, third branch 30 further includes a working fluid pump 31 disposed upstream of the heat collection device. By the arrangement of the working medium pump 31, the flow speed of the liquid working medium of the third branch 30 can be improved, the flow time is shortened, and the heat exchange efficiency is improved. An inlet of the working fluid pump 31 communicates with an inlet of the third branch 30. Of course, the working substance pump 31 may be disposed downstream of the heat collecting device.

In some embodiments of the utility model, the outlet of the condenser 12 is the outlet of the first branch 10.

In some embodiments of the present utility model, the outlet of the oil separator 25 is the outlet of the second leg 20.

In some embodiments of the utility model, the outlet of the heat collecting device is the outlet of the third branch.

In some embodiments of the utility model, the first branch 10 in the air conditioning system comprises an ejector 11 and a condenser 12 arranged in series in sequence along the direction of flow of the working medium. The high-temperature gaseous working medium discharged from the ejector 11 is cooled to the surrounding medium by the condenser 12, and then the gaseous working medium is changed into liquid common medium. The second branch 20 includes an electronic expansion valve 21, an evaporator 22, a gas-liquid separator 23, a compressor 24, and an oil separator 25, which are sequentially arranged in series along the flow direction of the working medium. The inlet of the electronic expansion valve 21 is communicated with the outlet of the condenser 12 through a pipeline, and the exhaust port of the compressor 24 is connected with the first inlet of the ejector 11 through a pipeline, so that working medium passing through the exhaust port of the compressor 24 enters the first inlet of the ejector 11. The third branch 30 includes a working fluid pump 31 and an evaporative heat exchanger 32 sequentially connected in series along the flow direction of the working fluid, and an inlet of the working fluid pump 31 is connected with an outlet of the condenser 12 through a pipeline. A first bypass line 40 is connected between the oil separator 25 and the outlet of the condenser 12, and a second shut-off valve 41 is provided in the first bypass line 40. A second bypass line 50 is connected between the outlet of the evaporator and the first inlet, the second bypass line being provided with a first shut-off valve 51. A third shut-off valve 26 is arranged between the outlet of the second branch and said first inlet. The evaporative heat exchanger absorbs external heat differently, so that the pressure ratio at the second inlet and the first inlet is different, and finally, the whole working medium circulation is completed under the mutual cooperation of the compressor and the ejector. The air conditioning system has a plurality of different operation modes according to the difference of the compression ratio of the second inlet and the first inlet. The working process of the air conditioning system is as follows: part of the liquid working medium passing through the condenser 12 passes through the electronic expansion valve 21 and then passes through the evaporator 22 to absorb heat of a user space, refrigeration of the user space is completed, the part of the liquid working medium is changed into Cheng Qitai public substance, after the liquid working medium which is not gasified completely is collected through the gas-liquid separator 23, the compressor 24 sucks the gaseous working medium and discharges the gaseous working medium after working by the compressor 24, the gaseous working medium passes through the oil separator 25 again, and after lubricating oil in the high-temperature gaseous working medium is collected, the gaseous working medium enters the first inlet of the ejector 11. The rest part of the liquid working medium passing through the condenser 12 enters the evaporative heat exchanger 32 under the action of the working medium pump 31 to absorb external heat, the liquid working medium absorbing the external heat is changed into high-temperature high-pressure gaseous working medium, the pressure of the working medium passing through the evaporative heat exchanger 32 is larger than the pressure of the working medium flowing out of the exhaust port of the compressor 24, and the working medium passing through the evaporative heat exchanger 32 enters the second inlet of the ejector 11. The working medium of the second inlet is injection fluid, negative pressure is formed in the ejector, the working medium of the first inlet is injected, the two working media are mixed to form intermediate pressure, the intermediate pressure working medium enters the condenser, the working medium circularly flows in the whole air conditioning system, and the working mode is a compressor coupling ejector working mode. Or when the heat absorbed by the heat collecting device is less than the heat absorbed by the heat collecting device, the second stop valve 41 is opened, the first stop valve 51 is closed, the compressor 24 does work, high-temperature and high-pressure gas working medium is discharged, the gas working medium enters the condenser 12 through the first bypass pipeline 40 and then passes through the electronic expansion valve and the evaporator to absorb the heat of the user space to refrigerate, and the working mode is a compressor working mode. Or when the heat absorbed by the heat collecting device is great, so that the pressure difference between the second inlet and the first inlet of the ejector reaches the optimal injection ratio, the second stop valve 41 is closed, the first stop valve 51 and the third stop valve 26 are opened, the working medium passing through the evaporator 22 directly enters the ejector 11 through the second bypass pipeline 50 and is injected by the high-pressure working medium of the third branch, and the working mode is the ejector working mode.

By now it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the utility model have been shown and described herein in detail, many other variations or modifications of the utility model consistent with the principles of the utility model may be directly ascertained or inferred from the present disclosure without departing from the spirit and scope of the utility model. Accordingly, the scope of the present utility model should be understood and deemed to cover all such other variations or modifications.

Claims

1. An air conditioning system, comprising:

the air conditioning system further includes:

2. The air conditioning system of claim 1, wherein the second leg further comprises an evaporator;

3. The air conditioning system of claim 2, further comprising a second bypass line;

4. An air conditioning system according to claim 1, wherein,

the flow path control device comprises a second stop valve, the second stop valve is arranged on the first bypass pipeline, and the second stop valve enables the first bypass pipeline to be opened or closed;

5. An air conditioning system according to claim 1, wherein,

the third branch comprises a heat collecting device;

6. An air conditioning system according to claim 2, wherein,

the second branch further comprises a throttling device arranged upstream of the evaporator.

7. An air conditioning system according to claim 5, wherein,

the third branch also comprises a working medium pump connected to the upstream or downstream of the heat collecting device.

8. An air conditioning system according to claim 7, wherein,

the heat collecting device is an evaporative heat exchanger.

9. An air conditioning system according to claim 6, wherein,

the throttling device is an electronic expansion valve.

10. An air conditioning system according to claim 5, wherein,

the outlet of the condenser is the outlet of the first branch;

the outlet of the oil separator is the outlet of the second branch;

the outlet of the heat collecting device is the outlet of the third branch.