CN213335034U - Pressure protection device for carbon dioxide multi-split central air conditioner and central air conditioner thereof - Google Patents

Abstract

The utility model relates to a carbon dioxide allies oneself with pressure protection device for central air conditioning more and reaches central air conditioning thereof. The utility model discloses a carbon dioxide allies oneself with many online central air conditioning system pressure protection device more, pressure protection device sets up in the carbon dioxide allies oneself with online central air conditioning system more that utilizes carbon dioxide as cycle medium, pressure adjustment device includes the pressure regulating tank, the pressure regulating tank with the liquid storage pot is linked together through the pipeline, the pressure regulating tank with the carbon dioxide compressor end pipe connection of breathing in. The beneficial effects are as follows: through setting up pressure adjustment jar, solve the expanded problem of liquid when shutting down. Through setting up first electronic expansion valve, can accurate control the pressure in the liquid storage tank below the critical point, the jar internal temperature is the saturation temperature that the jar pressure corresponds or has certain subcooling temperature, and the system operation is more high-efficient.

Description

Pressure protection device for carbon dioxide multi-split central air conditioner and central air conditioner thereof

Technical Field

The utility model relates to an air conditioner field, in particular to carbon dioxide multi-split central air conditioning pressure protection device and central air conditioning thereof.

Background

The central air conditioner can be installed in a subarea mode and controlled in a subarea mode, can independently operate in each room, can respectively adjust air in each area, has the advantages of high efficiency, energy conservation, good comfort, attractive appearance, quiet operation and the like, and is more and more widely applied. The multi-split air conditioning unit has the characteristics of energy conservation, low operation cost, reliable operation, good unit adaptability and wide refrigerating and heating temperature range by using a multi-split air conditioning unit, and is suitable for commercial and civil use.

The traditional multi-split central air conditioner mostly uses Freon as a refrigerating working medium, and due to the characteristics of high Freon density, high viscosity and small pressure difference, the number of the tail ends is small, and the number of the tail end wind disks is generally lower than 10; the Freon has high viscosity, so that the installation fall between the indoor unit and the outdoor unit is small, the piping distance is short, and the application range is limited; freon discharge also causes a reduction in ozone content. With the continuous enhancement of the attention of the international society on the aspects of energy conservation, emission reduction and environmental protection, the elimination pace of the Freon refrigerant is accelerated, and carbon dioxide as a safe and environment-friendly refrigerant has wide application prospect and considerable economic value. The carbon dioxide air conditioning system has the characteristic of high pressure, the pressure of the liquid storage tank can be increased along with the operation of the system, if the pressure in the liquid storage tank is higher than a critical value, non-liquid high-density gas is in the liquid storage tank, the refrigerating capacity is greatly reduced, and the safety of the system can be reduced due to the increase of the pressure; on the other hand, it is still necessary to provide more pressure-resistant components and parts, and the manufacturing cost is also increased, so that the pressure protection device for the carbon dioxide multi-split air conditioner and the central air conditioner thereof, which have simple structure and low manufacturing cost, are provided, and the utility model discloses a creative motivation.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's not enough, provide a simple structure, low in manufacturing cost's carbon dioxide multi-connected air conditioner central air conditioning for use pressure protection device and central air conditioning thereof

The utility model provides a pair of carbon dioxide allies oneself with quick-witted central air conditioning pressure protection device more, its technical scheme is:

the utility model provides a carbon dioxide allies oneself with quick-witted central air conditioning system more pressure protection device for, pressure protection device sets up in the carbon dioxide allies oneself with quick-witted central air conditioning system more that utilizes carbon dioxide as cycle medium, and pressure adjustment device includes the pressure regulation jar, the pressure regulation jar passes through the pipeline with the liquid storage pot and is linked together, the pressure regulation jar is connected with the carbon dioxide compressor suction end pipeline.

Preferably, a first electronic expansion valve is arranged between the pressure regulating tank and the suction end pipeline of the carbon dioxide compressor.

Preferably, the bottom of the pressure regulating tank is communicated with the top of the liquid storage tank; the top of the pressure regulating tank is connected with a pipeline at the suction end of the carbon dioxide compressor.

A carbon dioxide multi-split central air conditioner comprises a carbon dioxide compressor, an outdoor heat exchanger, a liquid storage tank and a plurality of tail end heat exchangers which are connected in parallel, wherein the carbon dioxide compressor, the outdoor heat exchanger, the liquid storage tank and the plurality of tail end heat exchangers are communicated with each other; a second electronic expansion valve bank is connected to the pipeline of the tail end heat exchanger in series; the central air conditioner also comprises a pressure protection device, and the pressure protection device is the pressure protection device for the carbon dioxide multi-split central air conditioner.

Preferably, the central air conditioner comprises a first high-pressure four-way valve and a second high-pressure four-way valve, and four interfaces of the first high-pressure four-way valve are respectively communicated with a suction end of a carbon dioxide compressor, a discharge end of the carbon dioxide compressor, an outdoor heat exchanger and a tail end heat exchanger; and four interfaces of the second high-pressure four-way valve are respectively connected with the outdoor heat exchanger, the liquid inlet of the liquid storage tank, the liquid outlet of the liquid storage tank and the tail end heat exchanger.

Preferably, a first one-way overflow valve is arranged on the pipeline between the liquid storage tank and the second high-pressure four-way valve.

Preferably, in the cooling mode, the first high-pressure four-way valve conducts the exhaust end of the carbon dioxide compressor and the suction end of the outdoor heat exchanger, and conducts the outlet end of the tail end heat exchanger and the suction end of the carbon dioxide compressor; the second high-pressure four-way valve conducts the outlet end of the outdoor heat exchanger with the inlet end of the liquid storage tank, conducts the outlet end of the liquid storage tank with the inlet end of the tail end heat exchanger, and the carbon dioxide medium flows in the direction of sequentially passing through the carbon dioxide compressor, the first high-pressure four-way valve, the outdoor heat exchanger, the third electronic expansion valve, the second high-pressure four-way valve, the first one-way overflow valve, the liquid storage tank, the second electronic expansion valve group and the tail end heat.

Preferably, in the heating mode, the first high-pressure four-way valve conducts the exhaust end of the carbon dioxide compressor and the tail end heat exchanger, and conducts the outdoor heat exchanger and the suction end of the carbon dioxide compressor; the outdoor heat exchanger is communicated with the liquid storage tank through the second high-pressure four-way valve; communicating the liquid storage tank with the tail end heat exchanger; the carbon dioxide medium flows in sequence through the carbon dioxide compressor, the first high-pressure four-way valve, the tail end heat exchanger, the liquid storage tank, the second high-pressure four-way valve, the third electronic expansion valve and the outdoor heat exchanger to complete heating.

Preferably, the outdoor heat exchanger comprises an aerosol generating device and a heat exchange tube, the aerosol of the aerosol generating device enters the heat exchange cavity, water micelles in the aerosol are gradually decomposed into small micelles by the large micelles when absorbing the radiation heat of the refrigerant in the heat exchange tube, the aerosol absorbs heat in the process of decomposing into the small micelles by the large micelles, so that the carbon dioxide refrigerant is condensed and liquefied, and the whole process of decomposing into the small micelles by the large micelles is dynamic and continuous.

Preferably, the aerosol generating device comprises a closed shell, air extracting equipment and a water atomizing device, wherein the air extracting equipment is used for forming negative pressure in the closed shell, the water atomizing device is used for atomizing liquid water into water mist with a larger specific surface area, the atomized water and air form aerosol in the closed shell under the action of the negative pressure, the aerosol enters the heat exchange cavity for heat exchange, and the water after heat exchange is directly discharged into the atmosphere.

The utility model discloses an implement including following technological effect:

the utility model discloses a carbon dioxide allies oneself with air conditioner central air conditioning pressure protection device more, when liquid storage pot pressure was too high, liquid storage pot, pressure regulating tank, carbon dioxide compressor, outdoor heat exchanger constitute a little circulation, can be with the pressure reduction in the liquid storage pot to further refrigerate. In addition, the pressure regulating tank can store liquid refrigerant, so that the liquid refrigerant cannot enter the high-speed rotationIn the carbon dioxide compressor, the damage of the carbon dioxide compressor is avoided. The second function of the pressure regulating tank is: when the central air conditioner is stopped for a long time in summer, the liquid in the liquid storage tank changes due to the heat absorption density, for example, the liquid storage tank is 28 ℃ liquid (the density is about 655.28kg/m at the moment)³) The pressure is corresponding saturation pressure, when the machine is stopped for a long time or the environment radiates heat, the density is about 419.09kg/m when the pressure in the pipe reaches 35 ℃ and 80bar³Depending on the conservation of mass, additional space is required to store this portion of the expanded fluid. Through setting up pressure adjustment jar, solve the expanded problem of liquid when shutting down. And a first electronic expansion valve is arranged between the pressure regulating tank and the pipeline at the suction end of the carbon dioxide compressor. Through setting up first electronic expansion valve, can accurate control the pressure in the liquid storage tank below the critical point, the jar internal temperature is the saturation temperature that the jar pressure corresponds or has certain subcooling temperature, and the system operation is more high-efficient. Specifically, the bottom of pressure adjustment jar with the top intercommunication of liquid storage pot is so connected for gas in the liquid storage pot gets into in the pressure adjustment jar more easily. The top of the pressure regulating tank is connected with a pipeline at the suction end of the carbon dioxide compressor.

Drawings

Fig. 1 is the utility model discloses carbon dioxide allies oneself with quick-witted central air conditioning pressure protection device schematic structure view more.

Fig. 2 is a schematic view of a refrigeration mode system of a carbon dioxide multi-split central air conditioner according to an embodiment of the present invention.

Fig. 3 is a schematic view of a heating mode system of a carbon dioxide multi-split central air conditioner according to an embodiment of the present invention.

In the figure: 1. a carbon dioxide compressor; 2. a first high pressure four-way valve; 3. an outdoor heat exchanger; 4. a second high-pressure four-way valve; 5. a liquid storage tank; 6. a terminal heat exchanger; 7. a third electronic expansion valve; 8. a first one-way relief valve; 9. a second electronic expansion valve bank; 10. a pressure regulating tank; 11. a first electronic expansion valve; 12. a heat exchange pipe; 13. an aerosol inlet; 14. an aerosol outlet.

Detailed Description

The present invention will be described in detail with reference to the following embodiments and the accompanying drawings, wherein the described embodiments are only intended to facilitate the understanding of the present invention, and do not limit the present invention in any way.

Referring to fig. 1, the pressure protection device for a carbon dioxide multi-split central air conditioner provided by this embodiment is disposed in a carbon dioxide multi-split central air conditioning system using carbon dioxide as a circulating working medium, and includes a pressure regulation tank 10, the pressure regulation tank 10 is communicated with a liquid storage tank 5 through a pipeline, and the pressure regulation tank 10 is connected with a suction end pipeline of a carbon dioxide compressor 1. The pressure of the liquid storage tank 5 can be increased along with the operation of the system, if the pressure in the liquid storage tank 5 is higher than a critical value, non-liquid high-density gas is in the liquid storage tank 5, the refrigerating capacity is greatly reduced, and the safety of the system can be reduced due to the pressure increase; on the other hand, more pressure-resistant parts are needed to be provided, the manufacturing cost is also increased, and through the structure, when the pressure of the liquid storage tank 5 is too high, the liquid storage tank 5, the pressure adjusting tank 10, the carbon dioxide compressor 1 and the outdoor heat exchanger 3 form a small circulation, so that the pressure in the liquid storage tank 5 can be reduced, and further refrigeration can be realized. In addition, the pressure regulating tank 10 can store liquid refrigerant, so that the liquid refrigerant cannot enter the carbon dioxide compressor 1 rotating at a high speed, and the carbon dioxide compressor 1 is prevented from being damaged. The second function of the pressure regulating tank 10 is: when the central air conditioner is stopped for a long time in summer, the liquid in the liquid storage tank 5 changes due to the density of heat absorption, for example, the liquid storage tank 5 is liquid at 28 ℃ when the central air conditioner is stopped (the density is about 655.28kg/m at the moment)³) The pressure is corresponding saturation pressure, when the machine is stopped for a long time or the environment radiates heat, the density is about 419.09kg/m when the pressure in the pipe reaches 35 ℃ and 80bar³Depending on the conservation of mass, additional space is required to store this portion of the expanded fluid. By providing the pressure regulating tank 10, the problem of liquid expansion during shutdown is solved. A first electronic expansion valve 11 is arranged between the pressure regulating tank 10 and the pipeline at the suction end of the carbon dioxide compressor 1. By arranging the first electronic expansion valve 11, the pressure in the liquid storage tank 5 can be accurately controlled to be criticalBelow the point, the temperature in the tank is the saturation temperature corresponding to the tank pressure or has a certain supercooling temperature, and the system operation is more efficient. Specifically, the bottom of the pressure regulating tank 10 is communicated with the top of the liquid storage tank 5, and is connected in such a way that the gas in the liquid storage tank 5 can enter the pressure regulating tank 10 more easily. The top of the pressure regulating tank 10 is connected with the suction end pipeline of the carbon dioxide compressor 1.

Referring to fig. 2 and 3, the present embodiment further provides a carbon dioxide multi-split central air conditioner, which includes the above-mentioned pressure protection device, and a single-stage carbon dioxide circulation system using carbon dioxide as a circulating working medium, where the single-stage carbon dioxide circulation system includes an outdoor unit and a plurality of end heat exchangers 6 (indoor units) arranged in parallel, and a carbon dioxide medium completes circulating cooling and/or heating in the carbon dioxide compressor 1, the outdoor heat exchanger 3, the liquid storage tank 5, and the end heat exchangers 6 which are communicated with each other. Further, the central air conditioner comprises a first high-pressure four-way valve 2 and a second high-pressure four-way valve 4, wherein four interfaces of the first high-pressure four-way valve 2 are respectively communicated with a suction end of the carbon dioxide compressor 1, a discharge end of the carbon dioxide compressor 1, the outdoor heat exchanger 3 and the tail end heat exchanger 6; and four interfaces of the second high-pressure four-way valve 4 are respectively connected with the outdoor heat exchanger 3, the liquid inlet of the liquid storage tank 5, the liquid outlet of the liquid storage tank 5 and the tail end heat exchanger 6. The refrigeration and heating reversing is realized. And a third electronic expansion valve 7 is arranged on a pipeline between the outdoor heat exchanger 3 and the liquid storage tank 5, and has the functions of throttling and reducing pressure. And a second electronic expansion valve group 9 is connected in series on the pipeline of the tail end heat exchanger 6, and has the functions of throttling and pressure reduction. Single stage means that it is distinguished from a cascade system, where carbon dioxide is recycled only, and no cascade is required.

The carbon dioxide compressor 1, the outdoor heat exchanger 3 and the liquid storage tank 5 can form an outdoor unit for providing a refrigerant or a heating medium, and the tail end heat exchanger 6 is arranged indoors and used for adjusting the temperature of a space. The carbon dioxide medium can complete circulation in a high-rise building with the height of more than 100 meters; the refrigerating efficiency cop of the central air conditioner is more than 4.5. More than 30 indoor units can be dragged by one outdoor unit, and at most more than 100 indoor units can be dragged by the outdoor unit.

The central air-conditioning refrigeration efficiency cop of the embodiment is more than 4.5. The GWP of the carbon dioxide is 1, the ODP is 0, and the refrigerant belongs to an environment-friendly refrigerant; has good safety and chemical stability: non-toxic, non-flammable, and suitable for various lubricating oils; has good thermal physical properties: the refrigerating capacity per unit volume is large, and the kinematic viscosity is low; has excellent flow and heat transfer characteristics. But because the critical temperature of the carbon dioxide is low (31.1 ℃), the carbon dioxide is easier to be kept in a gaseous state at the ambient temperature in summer, the critical pressure is high (7.38MPa), and the pressure in the gaseous state is higher, so that the operation pressure of the system is high, and the throttling loss is large. Based on the characteristic of carbon dioxide, use the technical scheme of the utility model, can guarantee promptly that the pressure in the central air conditioning keeps in a suitable within range to ensure CO₂The outlet of the outdoor heat exchanger is in a liquid state, so that the heat exchange effect in the tail end heat exchanger 6 is better, one main machine can drag more tail end heat exchangers 6 (more than 100), and the safe and normal operation of the system is ensured.

Referring to fig. 2, a first one-way overflow valve 8 is disposed on a pipeline between the liquid storage tank 5 and the second high-pressure four-way valve 4. The first one-way overflow valve 8 can only realize one-way circulation and has the function of pressure regulation, so that the pressure in the central air conditioner can be always kept in a proper range, and the efficient operation of the system is ensured.

Fig. 2 is a schematic diagram of carbon dioxide trend in a refrigeration mode, in which a first high-pressure four-way valve 2 conducts an exhaust end of a carbon dioxide compressor 1 and a suction end of an outdoor heat exchanger 3, and an outlet end of a tail end heat exchanger is conducted with the suction end of the carbon dioxide compressor 1; the outlet end of the outdoor heat exchanger 3 is communicated with the inlet end of the liquid storage tank 5 by the second high-pressure four-way valve 4, the outlet end of the liquid storage tank 5 is communicated with the inlet end of the tail end heat exchanger 6, and the carbon dioxide medium flows in the direction of sequentially passing through the carbon dioxide compressor 1, the first high-pressure four-way valve 2, the outdoor heat exchanger 3, the third electronic expansion valve 7, the second high-pressure four-way valve 4, the first one-way overflow valve 8, the liquid storage tank 5, the second electronic expansion valve group 9 and the tail. In the cooling mode, the third electronic expansion valve 7 is opened to the maximum opening degree; the second electronic expansion valve group 9 automatically adjusts the opening degree according to the set superheat degree; the first electronic expansion valve 11 achieves the purpose of controlling the pressure in the liquid storage tank 5 to be constant by adjusting the opening degree of the first electronic expansion valve, so that the safe and efficient operation of the system is kept.

Fig. 3 is a schematic diagram of the carbon dioxide trend in the heating mode, in which the first high-pressure four-way valve 2 connects the exhaust end of the carbon dioxide compressor 1 with the tail end heat exchanger 6 and connects the outdoor heat exchanger 3 with the suction end of the carbon dioxide compressor 1; the outdoor heat exchanger 3 is communicated with the liquid storage tank 5 through the second high-pressure four-way valve 4; communicating the liquid storage tank 5 with the tail end heat exchanger 6; the carbon dioxide medium flows through a carbon dioxide compressor 1, a first high-pressure four-way valve 2, a tail end heat exchanger 6, a liquid storage tank 5, a second high-pressure four-way valve 4, a third electronic expansion valve 7 and an outdoor heat exchanger 3 in sequence to finish heating. In the heating mode, the second electronic expansion valve group 9 is fully opened to the maximum opening; the third electronic expansion valve 7 automatically adjusts the opening degree according to the set superheat degree; the first electronic expansion valve 11 achieves the purpose of controlling the pressure in the liquid storage tank 5 to be constant by adjusting the opening degree of the first electronic expansion valve, so that the safe and efficient operation of the system is kept.

The utility model discloses a multi-functional central air conditioning of cold and hot many online of single-stage carbon dioxide is different from current multi-online air conditioning, and current multi-online air conditioning generally uses freon refrigerating system and water circulating system to superpose, uses hydrologic cycle temperature regulation, the utility model discloses in, use carbon dioxide single-stage circulation just can reach the requirement of central air conditioning multi-online, come control evaporating temperature through the suction pressure of control carbon dioxide compressor 1, for example can control evaporating temperature between 6-10 degrees centigrade, the body sense effect is better. In view of utilizing carbon dioxide as the cycle fluid, have the pressure differential big, mobility is good, density is little, the advantage of transcritical phase transition, can be used for high-rise building, can accomplish the circulation at the height of more than 100 meters, current freon many online central air conditioning is unable to accomplish, the present coolant all needs to set up the circulating pump again, and the cost is still high when consuming energy. The utility model discloses a central air conditioning, for traditional air conditioner, efficiency can improve more than 2 times, can save energy more than 50%.

Will the utility model discloses a carbon dioxide multi-split central air conditioningIn the actual test, according to the actual engineering test data: office area 2700m²82 end heat exchangers 6 are adopted, the outdoor heat exchanger 3 adopts a flash evaporation type closed heat exchanger, and the area of the outdoor heat exchanger 3 is 2000m²Only need three 15 carbon dioxide compressors 1 that match, condensation load 200KW, under ambient temperature 34 ℃'s environment, when evaporating pressure 45bar, condensing pressure is stable about 80bar, and system refrigeration efficiency cop is between 4.5 ~ 5.5, and system refrigeration efficiency cop can reach 6 evening, is far higher than current freon system refrigeration efficiency, observes according to the experiment, and carbon dioxide multi-split system can take terminal quantity to reach hundreds of platforms.

Referring to fig. 3, the outdoor heat exchanger 3 includes an aerosol generating device (not shown) and a heat exchange tube 12, the aerosol of the aerosol generating device enters a heat exchange cavity, water micelles in the aerosol are gradually decomposed into small micelles from large micelles when absorbing the radiation heat of the refrigerant in the heat exchange tube 12, the process of decomposing the aerosol into small micelles from large micelles absorbs heat, so that the carbon dioxide refrigerant is condensed and liquefied, and the whole process of decomposing the aerosol into small micelles from large micelles is dynamic and continuous.

Aerosol generating device includes closed shell, air exhaust equipment and water atomization device, air exhaust equipment is used for forming the negative pressure in closed shell, water atomization device is used for atomizing liquid water into the water smoke of great specific surface area, and atomizing water and air form aerosol in closed shell under the effect of negative pressure, and aerosol gets into heat exchange tube 12 by aerosol import 13 and carries out the heat transfer, and the water that the heat transfer was accomplished does not circulate, does not retrieve, directly discharges in the atmosphere through aerosol export 14, because the aerosol decomposes the in-process, mainly converts the heat into internal energy, and exhaust vapor temperature is not high, can not produce the heat island effect. Moreover, the water does not pollute the environment, and the cost is reduced while the environment is protected. The heat transfer mode has three kinds of modes of convection, conduction, radiation, the utility model discloses the high temperature carbon dioxide in the heat exchange tube 12 decomposes the little micelle in with the aerosol for the radiant heat and takes away thermal heat transfer mode, and heat exchange efficiency improves greatly.

It is different with current air-cooled heat exchanger and evaporation cold heat exchanger principle that need to explain very much, the utility model discloses an outdoor heat exchanger is for under the negative pressure condition, utilizes aerosol to be decomposed into little micelle by big micelle gradually under the condition of radiant heat and carries out the heat transfer, and the heat transfer is not influenced yet to the high temperature and high humidity condition, can be under different climatic conditions normal use.

In addition, the volume of the atomized water drops is reduced, so that the atomized water drops are easy to fly, the liquidity of the atomized water drops is accelerated, and the atomized water drops can quickly exchange heat with the outdoor heat exchanger 3; and most of the small-volume droplets absorb heat and evaporate into steam in the process of direct contact heat exchange, so that the refrigeration efficiency is greatly improved.

It should be noted that the terms "front/back", "up/down", "left/right", "vertical/horizontal", "inside/outside", etc. indicating the orientation or positional relationship may appear in the description of the present invention based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present invention and simplifying the description, but not for indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. For convenience of description, the terms "left", "right", "up" and "down" used hereinafter are the same as the left, right, up and down directions of the drawings, but do not limit the structure of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "communicating," "connecting," and "connecting" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention, and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims (10)

1. The utility model provides a carbon dioxide allies oneself with pressure protection device for central air conditioning that ally oneself with more which is idle call which characterized in that: the pressure protection device is arranged in a carbon dioxide multi-split central air-conditioning system which utilizes carbon dioxide as a circulating working medium, the pressure adjusting device comprises a pressure adjusting tank, the pressure adjusting tank is communicated with the liquid storage tank through a pipeline, and the pressure adjusting tank is connected with a suction end pipeline of the carbon dioxide compressor.

2. The pressure protection device for the carbon dioxide multi-split central air conditioner as claimed in claim 1, wherein: and a first electronic expansion valve is arranged between the pressure regulating tank and the pipeline at the suction end of the carbon dioxide compressor.

3. The pressure protection device for the carbon dioxide multi-split central air conditioner as claimed in claim 2, wherein: the bottom of the pressure adjusting tank is communicated with the top of the liquid storage tank; the top of the pressure regulating tank is connected with a pipeline at the suction end of the carbon dioxide compressor.

4. The utility model provides a carbon dioxide multi-split central air conditioner which characterized in that: the system comprises a carbon dioxide compressor, an outdoor heat exchanger, a liquid storage tank and a plurality of tail end heat exchangers which are connected in parallel, wherein a third electronic expansion valve is arranged on a pipeline between the outdoor heat exchanger and the liquid storage tank; a second electronic expansion valve bank is connected to the pipeline of the tail end heat exchanger in series; the central air conditioner further comprises a pressure protection device, and the pressure protection device is the pressure protection device for the carbon dioxide multi-split central air conditioner as claimed in any one of claims 1 to 3.

5. The carbon dioxide multi-split central air conditioner as claimed in claim 4, wherein: the central air conditioner comprises a first high-pressure four-way valve and a second high-pressure four-way valve, wherein four interfaces of the first high-pressure four-way valve are respectively communicated with a suction end of a carbon dioxide compressor, an exhaust end of the carbon dioxide compressor, an outdoor heat exchanger and a tail end heat exchanger; and four interfaces of the second high-pressure four-way valve are respectively connected with the outdoor heat exchanger, the liquid inlet of the liquid storage tank, the liquid outlet of the liquid storage tank and the tail end heat exchanger.

6. The carbon dioxide multi-split central air conditioner as claimed in claim 5, wherein: and a first one-way overflow valve is arranged on the pipeline of the liquid storage tank and the second high-pressure four-way valve.

7. The carbon dioxide multi-split central air conditioner as claimed in claim 5, wherein: in a refrigeration mode, the first high-pressure four-way valve conducts the exhaust end of the carbon dioxide compressor and the suction end of the outdoor heat exchanger, and conducts the outlet end of the tail end heat exchanger and the suction end of the carbon dioxide compressor; the second high-pressure four-way valve conducts the outlet end of the outdoor heat exchanger with the inlet end of the liquid storage tank, conducts the outlet end of the liquid storage tank with the inlet end of the tail end heat exchanger, and the carbon dioxide medium flows in the direction of sequentially passing through the carbon dioxide compressor, the first high-pressure four-way valve, the outdoor heat exchanger, the third electronic expansion valve, the second high-pressure four-way valve, the first one-way overflow valve, the liquid storage tank, the second electronic expansion valve group and the tail end heat.

8. The carbon dioxide multi-split central air conditioner as claimed in claim 5, wherein: in the heating mode, the first high-pressure four-way valve conducts the exhaust end of the carbon dioxide compressor and the tail end heat exchanger and conducts the outdoor heat exchanger and the suction end of the carbon dioxide compressor; the outdoor heat exchanger is communicated with the liquid storage tank through the second high-pressure four-way valve; communicating the liquid storage tank with the tail end heat exchanger; the carbon dioxide medium flows in sequence through the carbon dioxide compressor, the first high-pressure four-way valve, the tail end heat exchanger, the liquid storage tank, the second high-pressure four-way valve, the third electronic expansion valve and the outdoor heat exchanger to complete heating.

9. The carbon dioxide multi-split central air conditioner as claimed in claim 4, wherein: the outdoor heat exchanger comprises an aerosol generating device and a heat exchange tube, wherein aerosol of the aerosol generating device enters a heat exchange cavity, water micelles in the aerosol are gradually decomposed into small micelles by large micelles when absorbing the radiant heat of a refrigerant in the heat exchange tube, the aerosol absorbs heat in the process of decomposing into the small micelles by the large micelles, so that the carbon dioxide refrigerant is condensed and liquefied, and the whole process of decomposing into the small micelles by the large micelles is dynamic and continuous.

10. The carbon dioxide multi-split central air conditioner as claimed in claim 9, wherein: the aerosol generating device comprises a closed shell, air extracting equipment and a water atomizing device, wherein the air extracting equipment is used for forming negative pressure in the closed shell, the water atomizing device is used for atomizing liquid water into water mist with larger specific surface area, atomized water and air form aerosol in the closed shell under the action of the negative pressure, the aerosol enters a heat exchange cavity for heat exchange, and water after heat exchange is finished is directly discharged into the atmosphere.

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