CN114688637B - Air conditioning system and control method - Google Patents
Air conditioning system and control method Download PDFInfo
- Publication number
- CN114688637B CN114688637B CN202210303502.6A CN202210303502A CN114688637B CN 114688637 B CN114688637 B CN 114688637B CN 202210303502 A CN202210303502 A CN 202210303502A CN 114688637 B CN114688637 B CN 114688637B
- Authority
- CN
- China
- Prior art keywords
- gas
- main body
- pipe
- body container
- liquid separation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/26—Refrigerant piping
- F24F1/32—Refrigerant piping for connecting the separate outdoor units to indoor units
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/08—Compressors specially adapted for separate outdoor units
- F24F1/10—Arrangement or mounting thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/40—Vibration or noise prevention at outdoor units
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/006—Accumulators
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention provides an air conditioning system, which can reduce the influence of cavitation bubbles in long piping on an indoor heat exchanger or an outdoor unit during refrigeration and heating operation, thereby improving the working efficiency of the air conditioning system, and comprises: the outdoor units are respectively connected with the first throttle valves, and the compressor of at least one outdoor unit is an air injection enthalpy-increasing compressor; the indoor units comprise an indoor heat exchanger and a second throttle valve connected with the indoor heat exchanger; the gas-liquid separation assembly is provided with a main body container, a first outer tube arranged at the top of the main body container, a gas-liquid separation tube connected with the first outer tube and arranged inside the main body container, a steam outlet tube arranged at the top of the main body container, and a second outer tube arranged at the bottom of the main body container, wherein the first outer tube is connected with a plurality of first throttle valves, the second outer tube is connected with a plurality of second throttle valves in a homogeneous phase interconnection manner, and the steam outlet tube is communicated with an enthalpy increasing jet port of the enthalpy increasing jet compressor.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a multi-split air conditioning system with a plurality of outdoor units.
Background
As the application of the multi-split system is wider and wider, the multi-split system comprises more and more outdoor units and more functional modules of the outdoor units. The outdoor units having different functional modules are disposed on a roof or other suitable place, and the outdoor units are required to be disposed on a system pipeline simultaneously with 3-100 indoor units.
Because the outdoor units with different functional modules have asynchronism in operation, the refrigerant is subjected to heat exchange with the environment in the long piping, so that pressure loss is caused, a large number of cavitation bubbles are generated, and the effective working volume of the indoor heat exchanger is occupied in refrigeration operation, so that the refrigeration working efficiency of the indoor units is directly influenced. Meanwhile, when in heating operation, a large amount of cavitation bubbles can influence the heat exchange characteristic and the evaporation temperature of the outdoor unit, so that the air conditioning system needs to repeatedly frost and defrost, and the heating capacity of the indoor heat exchanger and the thermal comfort of the indoor environment are influenced.
Therefore, it is an object of the prior art to provide an air conditioning system capable of reducing the influence of cavitation bubbles in long pipes on an indoor heat exchanger or an outdoor unit during both cooling and heating operations, and thereby improving the operation performance of the air conditioning system.
Disclosure of Invention
In order to solve the above problems, the present invention provides an air conditioning system, which can reduce the influence of cavitation bubbles in long pipes on an indoor heat exchanger or an outdoor unit during both cooling and heating operations, and thereby improve the working efficiency of the air conditioning system, comprising: the outdoor units are respectively connected with the first throttle valves, and the compressor of at least one outdoor unit is an air injection enthalpy-increasing compressor; the indoor units comprise an indoor heat exchanger and a second throttle valve connected with the indoor heat exchanger; the gas-liquid separation assembly is provided with a main body container, a first outer tube arranged at the top of the main body container, a gas-liquid separation tube connected with the first outer tube and arranged inside the main body container, a steam outlet tube arranged at the top of the main body container, and a second outer tube arranged at the bottom of the main body container, wherein the first outer tube is connected with a plurality of first throttle valves, the second outer tube is connected with a plurality of second throttle valves in a homogeneous phase interconnection manner, and the steam outlet tube is communicated with an enthalpy increasing jet port of the enthalpy increasing jet compressor.
According to the technical scheme of the invention, the plurality of outdoor units can be connected in parallel with the same outdoor units, but the plurality of outdoor units with different functional modules are preferable, so that different requirements of users can be met, such as hot water preparation, partition control and the like. The outdoor unit is connected with the first throttle valve, the indoor heat exchanger is connected with the second throttle valve, and when the air conditioning system is in refrigeration operation, liquid refrigerant from the outdoor unit is throttled in the first throttle valve and then becomes gas-liquid mixed state refrigerant and enters the gas-liquid separation assembly; when the air conditioning system is in heating operation, the liquid refrigerant from the indoor heat exchanger is throttled in the second throttle valve and then becomes a gas-liquid mixed state refrigerant, and the gas-liquid mixed state refrigerant enters the gas-liquid separation assembly.
The gas-liquid separation module has: the device comprises a main body container, a first outer tube arranged at the top of the main body container, a gas-liquid separation tube connected with the first outer tube and arranged inside the main body container, a steam outlet tube arranged at the top of the main body container and a second outer tube arranged at the bottom of the main body container. Preferably, the gas-liquid separation tube arranged in the main body container extends to a position close to the bottom of the main body container so as to prevent liquid refrigerant from entering the steam outlet tube, the first outer tube and the second outer tube are respectively positioned at the top and the bottom of the main body container in the longitudinal direction and are respectively positioned at the two ends of the main body container in the transverse direction, so that the gas-liquid separation can be better realized by utilizing the length of the main body container. The first outer tube and the second outer tube can be independent tube bodies or can be integrated with other connecting tubes.
The first outer tube is connected with the first throttle valves, the second outer tube is connected with the second throttle valves, and the steam outlet tube is communicated with an enthalpy-increasing jet port of the enthalpy-increasing jet compressor. When the air conditioning system is in refrigeration operation, the gas-liquid mixed state refrigerant enters the gas-liquid separation tube from the first outer tube, the gaseous refrigerant enters the vapor injection enthalpy-increasing port of the vapor injection enthalpy-increasing compressor from the vapor outlet tube, so that the circulation flow of the compressor is directly increased, the liquid refrigerant enters the indoor heat exchanger for heat exchange, and at the moment, the liquid refrigerant circulating in the indoor heat exchanger cannot occupy the working volume of the indoor heat exchanger due to the reduction of cavitation bubbles, so that the refrigeration working efficiency of the indoor heat exchanger is improved. When the air conditioning system heats and runs, the gas-liquid mixed state refrigerant enters the gas-liquid separation tube from the second outer tube, the gaseous refrigerant enters the vapor injection enthalpy-increasing port of the vapor injection enthalpy-increasing compressor from the vapor outlet tube, the gaseous refrigerant effectively increases the circulation flow of the compressor during heating and running, and further improves the heating capacity and energy efficiency at low temperature, the liquid refrigerant enters the outdoor unit from the first outer tube for heat exchange, at the moment, the liquid refrigerant circulating in the outdoor unit is reduced due to the reduction of cavitation bubbles, the heat exchange characteristic and evaporation temperature of the outdoor unit are improved, the frosting degree and the frosting times of the air conditioning system are reduced, and therefore the heating capacity of the indoor heat exchanger and the thermal comfort of indoor environment are improved.
In a preferred embodiment of the present invention, the gas-liquid separation tube comprises: the first pipe portion, the first end and the first outer tube coupling of first pipe portion, the second end of first pipe portion extends to being close to main part container bottom to and the second pipe portion, and the second pipe portion communicates with first pipe portion, and extends in the altitude range that is close to main part container bottom.
According to the preferred technical scheme, the second end of the first pipe part extends to be close to the bottom of the main body container to help avoid liquid refrigerant from entering the steam outlet pipe, and meanwhile, when the air conditioning system heats and operates, gas-liquid mixed state refrigerant can enter the gas-liquid separation pipe from the second outer pipe positioned at the bottom of the main body container. The second pipe portion is communicated with the first pipe portion and extends in a height range close to the bottom of the main body container, and the second pipe portion plays a role in reducing the flow rate of the gas-liquid mixed state refrigerant so as to improve the efficiency of gas-liquid separation, and is beneficial to avoiding the gaseous refrigerant from entering the steam outlet pipe, so that the gaseous refrigerant enters the jet enthalpy-increasing compressor to generate liquid impact and the like.
The height range near the bottom of the main body container is between the bottom of the main body container and the bottom of the main body container is less than one third of the height of the main body container, and further between the bottom of the main body container and the bottom of the main body container is less than one fifth of the height of the main body container.
In a preferred embodiment of the present invention, the first tube portion is a vertical tube perpendicular to the bottom of the main body container, and the second tube portion is a horizontal tube parallel to the bottom of the main body container.
According to this preferred embodiment, the first pipe portion is a vertical pipe perpendicular to the bottom of the main body container, and the second pipe portion is a horizontal pipe parallel to the bottom of the main body container, and preferably, the gas-liquid separation pipe is an L-shaped pipe. The horizontal pipe can slow down the effect of medium pressure gas-liquid mixed state refrigerant velocity of flow on the one hand to improve gas-liquid separation's efficiency, on the other hand in the air conditioner heating operation in-process, the gas-liquid mixed state refrigerant from the second outer tube will be sent into vertical pipe and first outer tube through the horizontal pipe more easily, and then realize the high-efficient separation to gas-liquid mixed state refrigerant in the heating operation.
In the preferred technical scheme of the invention, a steam outlet pipe is communicated with an enhanced vapor injection port through a steam connecting pipe, and a one-way valve is arranged between the steam outlet pipe and the steam connecting pipe.
According to the preferred technical scheme, the one-way valve is arranged between the steam outlet pipe and the steam connecting pipe, and the flow mode of the one-way valve is that the gas-liquid separation assembly flows from the steam outlet pipe to the steam connecting pipe, so that the gaseous refrigerant separated in the gas-liquid separation assembly can smoothly flow out of the gas-liquid separation assembly, and meanwhile, the gaseous refrigerant in the steam connecting pipe is prevented from flowing back into the gas-liquid separation main body of the gas-liquid separation assembly.
In the preferred technical scheme of the invention, the steam connecting pipe is communicated with the vapor injection enthalpy increasing port through the vapor injection enthalpy increasing connecting pipe, and an electromagnetic valve is arranged between the steam connecting pipe and the vapor injection enthalpy increasing connecting pipe.
According to the preferred technical scheme, the steam connecting pipe is communicated with the enhanced vapor injection port through the external enhanced vapor injection connecting pipe, and the specification of the enhanced vapor injection connecting pipe is easier to adjust compared with the enhanced vapor injection port, so that the specification range of the optional steam connecting pipe is enlarged.
Because the electromagnetic valve is arranged between the steam connecting pipe and the jet enthalpy increasing connecting pipe, the electromagnetic valve can be automatically closed when the compressor is stopped, and the compressor is prevented from being damaged when being restarted.
In an alternative technical scheme of the invention, the gas-liquid separation assembly is arranged at the outdoor side, and a plurality of outdoor units are communicated with one gas-liquid separation assembly.
According to this optional technical scheme, gas-liquid separation subassembly sets up the installation configuration that will be favorable to gas-liquid separation subassembly in the outdoor side, and the steam outlet pipe is comparatively close with the jet enthalpy increase mouth of jet enthalpy increase compressor, need not to increase the quantity of extension piping. The plurality of outdoor units are communicated with one gas-liquid separation assembly, and one gas-liquid separation assembly is corresponding to every 2-3 outdoor units, so that the overall efficiency is better, and the outdoor unit is considered to be preferable. Wherein the connecting pipe connected between the outdoor side and the indoor side is a long pipe.
In an alternative embodiment of the present invention, the gas-liquid separation assembly is disposed at an indoor side, each of the outdoor units is connected to one of the gas-liquid separation assemblies, and the plurality of steam outlet pipes are connected to one of the steam connection pipes.
According to the optional technical scheme, the gas-liquid separation assembly is arranged at the indoor side, and when the air conditioning system is in refrigeration operation, the separated liquid refrigerant directly enters the indoor heat exchanger, so that the refrigerant liquid content at the inlet of the indoor heat exchanger can be improved, and the heat exchange efficiency of the indoor heat exchanger is further improved.
In the preferred technical scheme of the invention, the steam connecting pipe is a medium-pressure steam transmission long piping.
According to the preferred technical scheme, when the gas-liquid separation assembly is arranged on the indoor side, the steam connecting pipe needs to be connected to the outdoor side from the indoor side, preferably, a medium-pressure steam transmission long pipe is adopted as the steam connecting pipe, and the pipe diameter of the medium-pressure steam transmission long pipe is smaller than that of the gas connecting pipe and larger than that of the liquid connecting pipe.
The medium pressure is defined as the medium pressure with respect to the high-pressure gaseous refrigerant discharged from the compressor, and is lower than the pressure of the gaseous refrigerant directly discharged from the compressor.
The long pipe is a connecting pipe connecting the outside and the inside of the room.
The invention also provides a control method of the air conditioning system, when the air conditioning system in any one of the technical schemes carries out refrigeration operation, the gas-liquid mixed state refrigerant is controlled to enter the main body container through the first outer tube and the gas-liquid separation tube in sequence, the gaseous refrigerant is sent into the steam outlet tube, and the liquid refrigerant is sent into the second outer tube; when the air conditioning system in any one of the above technical schemes carries out heating operation, the gas-liquid mixed refrigerant is controlled to enter the main body container through the second outer tube, the gaseous refrigerant is sent to the steam outlet tube, and the liquid refrigerant is sent to the gas-liquid separation tube and the first outer tube in sequence.
According to the technical scheme provided by the invention, when the air conditioning system performs refrigeration operation, the gas-liquid mixed state refrigerant passing through the first throttle valve can be subjected to gas-liquid separation through the gas-liquid separation assembly, and the separated gaseous refrigerant is used for increasing the enthalpy of jet so as to reduce the gas content of the inlet and the outlet of the second throttle valve and reduce the noise of the second throttle valve during operation. When the air conditioning system heats, the gas-liquid mixed state refrigerant passing through the second throttle valve can be subjected to gas-liquid separation through the gas-liquid separation component, when the environment temperature is lower, the more the separated gaseous refrigerant is, the air suction capacity and the integral refrigerant circulation capacity of the compressor can be obviously increased by using the part of gaseous refrigerant for air injection enthalpy increase, meanwhile, the refrigerant circulation capacity in the outdoor unit is reduced, the heat exchange characteristic and the evaporation temperature of the outdoor unit are improved, the frosting degree of the air conditioning system is reduced, the frosting times are reduced, and therefore the heating capacity of the indoor heat exchanger and the thermal comfort of the indoor environment are improved.
In summary, the technical scheme provided by the invention at least has the following advantages:
(1) The gas-liquid separation is carried out on the refrigerant after primary throttling, and the gas-phase refrigerant is used for injecting the enthalpy increase, so that the circulation quantity of the compressor and the heating capacity of the whole system are improved;
(2) By adopting the structure of the gas-liquid separation assembly, the gas-liquid separation of the refrigerant after primary throttling can be realized during both the refrigeration operation and the heating operation of the air conditioning system;
(3) The problem that a large amount of cavitation bubbles are generated in a long piping caused by asynchronous operation of a plurality of outdoor units is solved, so that the energy-saving effect of the technical scheme in the invention is more remarkable in a medium-and-large-sized air conditioning system;
(4) The lower the ambient temperature is, a large amount of gaseous refrigerants are separated out through the gas-liquid separation assembly, so that the energy-saving effect of the technical scheme in the invention is more remarkable when the ambient temperature is lower.
Drawings
Fig. 1 is a schematic structural view of an air conditioning system according to an embodiment of the present invention;
fig. 2 is a schematic structural view of an air conditioning system according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a gas-liquid separation module according to an embodiment of the present invention.
Reference numerals: the air conditioning system 100, the outdoor unit 10, the first throttle valve 11, the third throttle valve 17, the indoor heat exchanger 20, the second throttle valve 21, the gas-liquid separation unit 30, the main body container 31, the first outer tube 32, the gas-liquid separation tube 33, the steam outlet tube 34, the second outer tube 35, the first tube portion 331, the second tube portion 332, the steam connecting tube 12, the check valve 36, the injection enthalpy increasing connecting tube 13, the solenoid valve 14, the first connecting tube 15, and the second connecting tube 16.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The present embodiment provides an air conditioning system 100, which can reduce the influence of cavitation bubbles in long pipes on an indoor heat exchanger 20 or an outdoor unit 10 during cooling and heating operations, and thereby improve the operation efficiency of the air conditioning system 100, the air conditioning system 100 comprising: a plurality of outdoor units 10, wherein the plurality of outdoor units 10 are respectively connected with a plurality of first throttle valves 11, and a compressor of at least one outdoor unit 10 is an enhanced vapor injection compressor (not shown); a plurality of indoor units including an indoor heat exchanger 20 and a second throttle valve 21 connected to the indoor heat exchanger 20; the gas-liquid separation assembly 30 comprises a main body container 31, a first outer tube 32 positioned at the top of the main body container 31, a gas-liquid separation tube 33 connected with the first outer tube 32 and arranged in the main body container 31, a steam outlet tube 34 positioned at the top of the main body container 31 and a second outer tube 35 positioned at the bottom of the main body container 31, wherein the first outer tube 32 is mutually connected with the plurality of first throttle valves 11, the second outer tube 35 is mutually connected with the plurality of second throttle valves 21, and the steam outlet tube 34 is communicated with an enthalpy increasing injection port of the enthalpy increasing injection compressor.
Further, the steam outlet pipe 34 is communicated with the vapor injection enthalpy increasing port through the steam connecting pipe 12, and a one-way valve 36 is arranged between the steam outlet pipe 34 and the steam connecting pipe 12.
Further, the steam connecting pipe 12 is communicated with the vapor injection enthalpy increasing port through the vapor injection enthalpy increasing connecting pipe 13, and an electromagnetic valve 14 is arranged between the steam connecting pipe 12 and the vapor injection enthalpy increasing connecting pipe 13.
The steam connecting pipe 12 is communicated with the enhanced vapor injection port through the external enhanced vapor injection connecting pipe 13, and the specification of the enhanced vapor injection connecting pipe 13 is easier to adjust compared with the enhanced vapor injection port, so that the specification range of the optional steam connecting pipe 12 is enlarged. For example, when the gas-liquid separation assembly 30 is disposed at the outdoor side, the steam connection pipe 12 is a normal connection pipe, and when the gas-liquid separation assembly 30 is disposed at the indoor side, the steam connection pipe 12 is a medium-pressure long steam transmission pipe having a pipe diameter larger than that of a normal liquid connection pipe and smaller than that of a normal gas connection pipe, and the air conditioning system 100 of different configurations can be adapted.
Specifically, when the air conditioning system 100 is in a cooling operation, the high-pressure liquid refrigerant from the outdoor unit 10 is throttled in the first throttle valve 11 and then is changed into a medium-pressure gas-liquid mixed refrigerant, the medium-pressure gas-liquid mixed refrigerant enters the gas-liquid separation tube 33 through the first outer tube 32 positioned at the top of the main body container 31 and enters the main body container 31, after further gas-liquid separation in the main body container 31, the gaseous refrigerant leaves from the vapor outlet tube 34 positioned at the top of the main body container 31 and is sent to the vapor injection enthalpy-increasing port of the vapor injection enthalpy-increasing compressor through the check valve 36 and the vapor connecting tube 12 to enter the next cycle, and the liquid refrigerant leaves from the second outer tube 35 positioned at the bottom of the main body container 31 and enters the second throttle valve 21 to be throttled and then enters the indoor heat exchanger 20 to complete the cooling cycle. The gas-liquid separation assembly 30 plays a role in secondary supercooling (further cooling saturated liquid to avoid phase change), improves the energy efficiency of cooling circulation in the air conditioning system 100, reduces the noise when the gas content entering the second throttle valve 21 reduces the throttle thereof, and brings better user experience for indoor users by the mute air conditioning system 100.
Referring to fig. 1, after the high-pressure gas refrigerant performs one heat exchange in the outdoor unit 10, the high-pressure gas refrigerant is throttled in the first throttle valve 11, and the throttled medium-pressure gas-liquid mixed-state refrigerant is fed into the first outer pipe 32 through the first connection pipe 15 and enters the gas-liquid separation pipe 33. The gaseous refrigerant is sent into the jet enthalpy increasing connecting pipe 13 by the steam connecting pipe 12 after passing through the check valve 36 through the steam outlet pipe 34, and then enters the jet enthalpy increasing port of the jet enthalpy increasing compressor, and an electromagnetic valve 14 is arranged between the steam connecting pipe 12 and the jet enthalpy increasing connecting pipe 13. The liquid refrigerant exits from the second outer tube 35 and is sequentially fed into the second throttle valve 21 and the indoor heat exchanger 20 in the indoor unit. The low-pressure gaseous refrigerant heat-exchanged by the indoor heat exchanger 20 sequentially passes through the second connection pipe 16 and the third throttle valve 17 to return to the outdoor unit 10, to complete the refrigeration cycle. In the refrigeration operation of the air conditioning system 100, the pipeline for sending the gas-liquid mixed state refrigerant into the main body container 31 is the first outer tube 32, and the first outer tube 32 may be an independent tube body or be integrally arranged with other connecting tubes (for example, the first connecting tube 15); the pipe for delivering the liquid refrigerant out of the main container 31 is the second outer pipe 35, and the second outer pipe 35 may be a separate pipe or may be integrally provided with other connecting pipes.
When the air conditioning system 100 is in heating operation, the high-pressure liquid refrigerant from the indoor heat exchanger 20 is throttled in the second throttle valve 21 and then becomes a medium-pressure gas-liquid mixed refrigerant, the medium-pressure gas-liquid mixed refrigerant enters the main body container 31 through the second outer tube 35 positioned at the bottom of the main body container 31, after further gas-liquid separation in the main body container 31, the liquid refrigerant enters the gas-liquid separation tube 33 and leaves from the first outer tube 32 positioned at the top of the main body container 31, and the liquid refrigerant enters the outdoor unit through the first throttle valve 11 to complete heating cycle. The gaseous refrigerant exits from a vapor outlet tube 34 located at the top of the main body vessel 31. The lower the ambient temperature is, the more gaseous refrigerant is sent to the vapor injection enthalpy-increasing port of the vapor injection enthalpy-increasing compressor through the check valve 36 and the vapor connecting pipe 12, so as to enter the next cycle, the suction amount of the compressor and the overall refrigerant circulation amount can be obviously increased, meanwhile, the refrigerant circulation amount in the outdoor unit is reduced, the evaporation temperature of the outdoor unit is favorably improved, the frosting frequency and the frosting times are reduced, and the energy efficiency of the refrigerant circulation in the air conditioning system 100 is favorably improved. A step of
Referring to fig. 1, after the high-pressure gas refrigerant exchanges heat once in the indoor heat exchanger 20, the high-pressure gas refrigerant is throttled in the second throttle valve 21, and the throttled medium-pressure gas-liquid mixed-state refrigerant is sent to the second outer tube 35 and the main body container 31, and enters the gas-liquid separation tube 33. The liquid refrigerant exits from the gas-liquid separation tube 33 and the first outer tube 32 extending to near the bottom of the main body container 31, and returns to the outdoor unit 10 through the first throttle valve 11 to perform secondary heat exchange to complete the heating cycle. The gaseous refrigerant is sent into the jet enthalpy increasing connecting pipe 13 by the steam connecting pipe 12 after passing through the check valve 36 through the steam outlet pipe 34, and then enters the jet enthalpy increasing port of the jet enthalpy increasing compressor, and an electromagnetic valve 14 is arranged between the steam connecting pipe 12 and the jet enthalpy increasing connecting pipe 13.
The air conditioning system 100 in fig. 2 is different from the air conditioning system 100 in fig. 1 in that the compressors of the plurality of outdoor units 10 in fig. 2 are all enhanced vapor injection compressors, and the enhanced vapor injection port of the enhanced vapor injection compressor is communicated with the vapor outlet pipe 34 through the enhanced vapor injection connecting pipe 13.
As a preferred embodiment, referring to fig. 3, the gas-liquid separation tube 33 has: the first tube portion 331, a first end of the first tube portion 331 is connected to the first outer tube 32, a second end of the first tube portion 331 extends to be close to the bottom of the main body container 31, and the second tube portion 332, the second tube portion 332 communicates with the first tube portion 331 and extends in a height range close to the bottom of the main body container 31.
In the preferred embodiment, the second end of the first tube portion 331 extends to near the bottom of the main body container 31 to help prevent the liquid refrigerant from entering the vapor outlet tube 34, and at the same time, the gas-liquid mixture refrigerant can enter the gas-liquid separation tube 33 from the second outer tube 35 located at the bottom of the main body container 31 during the heating operation of the air conditioning system 100. The second pipe portion 332 is communicated with the first pipe portion 331 and extends in a height range close to the bottom of the main body container 31, and the second pipe portion 332 plays a role in reducing the flow rate of the gas-liquid mixed state refrigerant, so as to improve the efficiency of gas-liquid separation, and helps to avoid the problem that the gaseous refrigerant enters the steam outlet pipe 34 and then enters the jet enthalpy-increasing compressor to generate liquid impact.
Wherein, referring to FIG. 3, the height range near the bottom of the main container 31 is between the contact with the bottom of the container and the height H from the bottom of the main container 31 is less than one third of the height H of the main container 31 (0.ltoreq.h.ltoreq.H/3). Further, between abutting against the bottom of the container and a height H from the bottom of the main body container 31 of less than one fifth of the height H of the main body container 31 ((0.ltoreq.h.ltoreq.H/5)).
As a preferred embodiment, the first tube portion 331 is a vertical tube perpendicular to the bottom of the main body container 31, and the second tube portion 332 is a horizontal tube parallel to the bottom of the main body container 31.
In the preferred embodiment, referring to fig. 3, the first tube portion 331 is a vertical tube perpendicular to the bottom of the main body container 31, and the second tube portion 332 is a horizontal tube parallel to the bottom of the main body container 31, and preferably the gas-liquid separation tube 33 is an L-shaped tube. The horizontal pipe can slow down the effect of medium pressure gas-liquid mixture state refrigerant velocity of flow on the one hand to improve gas-liquid separation's efficiency, on the other hand in the air conditioner heating operation in-process, the gas-liquid mixture state refrigerant from second outer tube 35 will be sent into vertical pipe and first outer tube 32 through the horizontal pipe more easily, and then realize the high-efficient separation to gas-liquid mixture state refrigerant in the heating operation.
As an alternative embodiment, the gas-liquid separation module 30 is disposed at the outdoor side, and the plurality of outdoor units 10 communicate with one gas-liquid separation module 30.
In this alternative embodiment, the disposition of the gas-liquid separation assembly 30 outside the chamber would facilitate the installation configuration of the gas-liquid separation assembly 30, with the vapor outlet tube 34 being closer to the enhanced vapor injection port of the enhanced vapor injection compressor, without increasing the number of elongated piping. The plurality of outdoor units 10 are preferably connected to one gas-liquid separation unit 30, and further, one gas-liquid separation unit 30 is provided for every 2 to 3 outdoor units 10, so that the overall efficiency is improved.
As an alternative embodiment, the gas-liquid separation modules 30 are disposed at the indoor sides, each of the outdoor units 10 is in communication with one of the gas-liquid separation modules 30, and a plurality of steam outlet pipes 34 are connected to one of the steam connection pipes 12. The steam connecting pipe 12 is a medium-pressure steam transmission long piping
In this alternative embodiment, the gas-liquid separation assembly 30 is disposed on the indoor side, and when the air conditioning system is in refrigeration operation, the separated liquid refrigerant directly enters the indoor heat exchanger 20, so as to improve the refrigerant liquid content at the inlet of the indoor heat exchanger 20, and further improve the heat exchange efficiency of the indoor heat exchanger 20. When the gas-liquid separation assembly 30 is disposed on the indoor side, the steam connecting pipe 12 needs to be connected from the indoor side to the outdoor side, and preferably, a long medium-pressure steam transmission pipe is used as the steam connecting pipe 12, and the pipe diameter of the long medium-pressure steam transmission pipe is smaller than that of the common gas connecting pipe and larger than that of the common liquid connecting pipe. The medium pressure is defined as the medium pressure with respect to the high-pressure gaseous refrigerant discharged from the compressor, and is lower than the pressure of the gaseous refrigerant directly discharged from the compressor.
The present embodiment also provides a control method of the air conditioning system 100, when the air conditioning system 100 in any one of the above embodiments performs a refrigeration operation, a gas-liquid mixed refrigerant is controlled to sequentially pass through the first outer tube 32 and the gas-liquid separation tube 33 to enter the main container 31, the gaseous refrigerant is sent to the steam outlet tube 34, and the liquid refrigerant is sent to the second outer tube 35; in any of the above embodiments, when the air conditioning system 100 performs a heating operation, the gas-liquid mixed refrigerant is controlled to enter the main container 31 through the second outer tube 35, the gaseous refrigerant is sent to the steam outlet tube 34, and the liquid refrigerant is sent to the gas-liquid separation tube 33 and the first outer tube 32 in sequence.
According to the technical solution provided in this embodiment, when the air conditioning system 100 performs a refrigeration operation, the gas-liquid mixed refrigerant passing through the first throttle valve 11 may be subjected to gas-liquid separation by the gas-liquid separation assembly 30, and the separated gaseous refrigerant is used for increasing the vapor injection enthalpy, so as to reduce the gas content at the inlet of the second throttle valve 21 and reduce the noise generated when the second throttle valve 21 operates. When the air conditioning system 100 performs heating operation, the gas-liquid mixed state refrigerant passing through the second throttle valve 21 can also be subjected to gas-liquid separation through the gas-liquid separation assembly 30, when the environment temperature is lower, the more the separated gaseous refrigerant is, the more the gaseous refrigerant is used for gas injection enthalpy increase, so that the suction capacity of the compressor and the integral refrigerant circulation capacity can be obviously increased, meanwhile, the refrigerant circulation capacity in the outdoor unit is reduced, the heat exchange characteristic and the evaporation temperature of the outdoor unit are improved, the frosting degree of the air conditioning system 100 is reduced, the frosting times are reduced, and therefore, the heating capacity of the indoor heat exchanger 20 and the thermal comfort of the indoor environment are improved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (7)
1. An air conditioning system, comprising:
the outdoor units are respectively connected with the first throttle valves, and at least one compressor of the outdoor units is an enhanced vapor injection compressor;
the indoor units comprise an indoor heat exchanger and a second throttle valve connected with the indoor heat exchanger;
a gas-liquid separation assembly, which is provided with a main body container, a first outer tube positioned at the top of the main body container, a gas-liquid separation tube connected with the first outer tube and arranged in the main body container, a steam outlet tube positioned at the top of the main body container, and a second outer tube positioned at the bottom of the main body container,
the first outer tube is mutually connected with a plurality of first throttle valves, the second outer tube is mutually connected with a plurality of second throttle valves, the steam outlet tube is communicated with an enthalpy increasing jet orifice of the enthalpy increasing jet compressor,
the gas-liquid separation pipe has:
a first tube portion having a first end connected to the first outer tube and a second end extending to near the bottom of the main container, and
a second pipe portion communicating with the first pipe portion and extending in a height range near the bottom of the main body container,
the first pipe part is a vertical pipe perpendicular to the bottom of the main body container, and the second pipe part is a horizontal pipe parallel to the bottom of the main body container.
2. An air conditioning system according to claim 1, wherein the steam outlet pipe communicates with the enhanced vapor injection port via a steam connecting pipe, and a check valve is provided between the steam outlet pipe and the steam connecting pipe.
3. The air conditioning system according to claim 2, wherein the steam connection pipe is communicated with the enhanced vapor injection port through an enhanced vapor injection connection pipe, and a solenoid valve is provided between the steam connection pipe and the enhanced vapor injection connection pipe.
4. The air conditioning system according to claim 1, wherein said gas-liquid separation unit is disposed outside of the room, and a plurality of said outdoor units are in communication with one of said gas-liquid separation units.
5. The air conditioning system according to claim 2, wherein said gas-liquid separation modules are provided on an indoor side, each of said outdoor units is in communication with one of said gas-liquid separation modules, and a plurality of said steam outlet pipes are connected to one of said steam connection pipes.
6. The air conditioning system according to claim 5, wherein the steam connection pipe is a medium pressure steam transmission long pipe.
7. A control method of an air conditioning system is characterized in that,
when the air conditioning system according to any one of claims 1 to 6 performs refrigeration operation, controlling a gas-liquid mixed state refrigerant to sequentially pass through the first outer tube and the gas-liquid separation tube to enter the main body container, wherein the gaseous refrigerant is sent into the steam outlet tube, and the liquid refrigerant is sent into the second outer tube;
when the air conditioning system according to any one of claims 1 to 6 performs heating operation, the gas-liquid mixed refrigerant is controlled to enter the main body container through the second outer tube, the gaseous refrigerant is sent to the steam outlet tube, and the liquid refrigerant is sent to the gas-liquid separation tube and the first outer tube in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210303502.6A CN114688637B (en) | 2022-03-24 | 2022-03-24 | Air conditioning system and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210303502.6A CN114688637B (en) | 2022-03-24 | 2022-03-24 | Air conditioning system and control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114688637A CN114688637A (en) | 2022-07-01 |
| CN114688637B true CN114688637B (en) | 2023-09-22 |
Family
ID=82138681
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210303502.6A Active CN114688637B (en) | 2022-03-24 | 2022-03-24 | Air conditioning system and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114688637B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10160190A (en) * | 1996-12-02 | 1998-06-19 | Daikin Ind Ltd | Air conditioner |
| CN104896785A (en) * | 2015-05-15 | 2015-09-09 | 广东美的暖通设备有限公司 | Enhanced vapor injection multi-online air conditioning system and control method thereof |
| CN106352572A (en) * | 2016-08-19 | 2017-01-25 | 广东美的暖通设备有限公司 | Air conditioning system |
| CN106382701A (en) * | 2016-11-22 | 2017-02-08 | 珠海格力电器股份有限公司 | Multi-split air conditioner and outdoor unit thereof, and control method and device |
| CN208779748U (en) * | 2018-08-07 | 2019-04-23 | 珠海格力电器股份有限公司 | air conditioning system |
-
2022
- 2022-03-24 CN CN202210303502.6A patent/CN114688637B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10160190A (en) * | 1996-12-02 | 1998-06-19 | Daikin Ind Ltd | Air conditioner |
| CN104896785A (en) * | 2015-05-15 | 2015-09-09 | 广东美的暖通设备有限公司 | Enhanced vapor injection multi-online air conditioning system and control method thereof |
| CN106352572A (en) * | 2016-08-19 | 2017-01-25 | 广东美的暖通设备有限公司 | Air conditioning system |
| CN106382701A (en) * | 2016-11-22 | 2017-02-08 | 珠海格力电器股份有限公司 | Multi-split air conditioner and outdoor unit thereof, and control method and device |
| CN208779748U (en) * | 2018-08-07 | 2019-04-23 | 珠海格力电器股份有限公司 | air conditioning system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114688637A (en) | 2022-07-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN217357661U (en) | Heat exchanger and air conditioner | |
| CN213841417U (en) | Multi-split system | |
| CN112361669B (en) | Multi-split system and control method thereof | |
| CN109386985B (en) | Two-pipe jet enthalpy-increasing outdoor unit and multi-split system | |
| CN109386986A (en) | Two pipes system heat-reclamation multi-compressors system and its air-conditioner outdoor unit | |
| CN100535550C (en) | Automobile heat pump air conditioner system | |
| CN109386989B (en) | Two-pipe jet enthalpy-increasing outdoor unit and multi-split system | |
| CN101625176B (en) | Quasi-tertiary compressed air source hot pump system | |
| WO2024098868A1 (en) | Air conditioning system and control method | |
| CN114688637B (en) | Air conditioning system and control method | |
| CN214841173U (en) | Hydraulic module of double-four-way valve multi-connected unit | |
| CN212644776U (en) | Outdoor unit of air conditioner | |
| CN205678933U (en) | Refrigerant circulation system and air conditioner with same | |
| CN111649504B (en) | Refrigerant active injection heat pump based on solar energy and control method thereof | |
| CN114353398A (en) | Air conditioner for controlling flow path to defrost condenser and defrosting method | |
| CN109099620B (en) | Air conditioning system | |
| CN100547274C (en) | Secondary throttling bidirectional thermal expansion valve | |
| CN219454305U (en) | Air-supplementing enthalpy-increasing air conditioning system | |
| CN219415323U (en) | Flash evaporator and air conditioning system | |
| CN218295941U (en) | Multi-split system and multi-split air conditioner | |
| CN219415314U (en) | Three-channel economizer and air conditioner | |
| CN221611636U (en) | Multipurpose electronic expansion valve structure assembly in air conditioner | |
| CN219037156U (en) | Heat pump and dehumidification system based on single compressor | |
| CN219415322U (en) | Flash evaporator and air conditioner | |
| CN209116455U (en) | A kind of multi-split air conditioner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |