CN110686420A - Multi-split air conditioner, defrosting method and computer readable storage medium - Google Patents
Multi-split air conditioner, defrosting method and computer readable storage medium Download PDFInfo
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- CN110686420A CN110686420A CN201911005623.7A CN201911005623A CN110686420A CN 110686420 A CN110686420 A CN 110686420A CN 201911005623 A CN201911005623 A CN 201911005623A CN 110686420 A CN110686420 A CN 110686420A
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- 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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
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- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- 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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
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- 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
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
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- 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2103—Temperatures near a heat exchanger
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a multi-split air conditioner, a defrosting method and a computer readable storage medium, wherein the multi-split air conditioner comprises: the air conditioner comprises an outer shell, wherein an air outlet is formed in the outer shell; the compressor is arranged in the outer machine shell; the outer machine heat exchanger is arranged in the outer machine shell, a plurality of refrigerant pipelines are arranged on the outer machine heat exchanger, and one end of each refrigerant pipeline is connected with an exhaust port of the compressor; one end of each indoor unit heat exchanger is connected with at least one refrigerant pipeline, and the other end of each indoor unit heat exchanger is connected to a return air port of the compressor; and two ends of the defrosting pipeline are respectively connected with an inlet pipe section of the refrigerant pipeline positioned on one side far away from the air outlet and an exhaust port of the compressor. By the technical scheme, the defrosting process of the side, away from the air outlet, of the external machine heat exchanger in the multi-split air conditioner can be effectively accelerated, the defrosting time of the whole machine is shortened, the influence of frosting on ventilation and heat dissipation of the external machine heat exchanger is reduced, and the heat exchange efficiency of the external machine heat exchanger is improved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a multi-split air conditioner, a defrosting method and a computer readable storage medium.
Background
At present, the application of an air heat source type heat pump air conditioner is common, but in the heating operation process in winter, the surface temperature of an outdoor unit heat exchanger is lower than 0 ℃, the frosting phenomenon can be generated, the cross section area of air circulation in the outdoor unit becomes smaller along with the increase of the thickness of a frost layer, the heat exchange effect is influenced, particularly for a top-outlet type multi-split air conditioner, the air quantity of the heat exchanger at the bottom of the outdoor unit is small, the heat exchange effect is poor, frosting is easier, the defrosting time is long, the working time of the whole machine in a defrosting mode is prolonged, and the energy consumption is increased.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, an object of the present invention is to provide a multi-split air conditioner.
Another object of the present invention is to provide a defrosting method.
It is still another object of the present invention to provide a computer-readable storage medium.
In order to achieve the above object, a first aspect of the present invention provides a multi-split air conditioner, including: the air conditioner comprises an outer shell, wherein an air outlet is formed in the outer shell; the compressor is arranged in the outer machine shell; the outer machine heat exchanger is arranged in the outer machine shell, a plurality of refrigerant pipelines are arranged on the outer machine heat exchanger, and one end of each refrigerant pipeline is connected with an exhaust port of the compressor; one end of each indoor unit heat exchanger is connected with at least one refrigerant pipeline, and the other end of each indoor unit heat exchanger is connected to a return air port of the compressor; and two ends of the defrosting pipeline are respectively connected with an inlet pipe section of the refrigerant pipeline positioned on one side far away from the air outlet and an exhaust port of the compressor.
According to the technical scheme of the first aspect of the invention, the multi-split air conditioner comprises an outer machine shell, a compressor, an outer machine heat exchanger, at least one inner machine heat exchanger and a defrosting pipeline. The outer casing is provided with an air outlet for discharging air outwards, so that the inner part of the outer casing is communicated with the outside atmosphere, and heat dissipation is carried out by utilizing the flowing of the air. The compressor and the outer machine heat exchanger are arranged in the outer machine shell, the outer machine heat exchanger is provided with a plurality of refrigerant pipelines, and one end of each refrigerant pipeline is connected with the exhaust port of the compressor, so that high-temperature and high-pressure refrigerants flowing out of the exhaust port of the compressor flow into the outer machine heat exchanger through the refrigerant pipelines, condensation and heat release are carried out in the outer machine heat exchanger, a frost layer on the surface of the outer machine heat exchanger is melted, and conventional defrosting operation is realized. The refrigerant which finishes defrosting operation in the outer machine heat exchanger flows back into the compressor through the inner machine heat exchanger to be recycled. Through being equipped with the defrosting pipeline, and the one end of defrosting pipeline links to each other with the entry pipeline section that is located the refrigerant pipeline of keeping away from air outlet one side, the other end links to each other with the gas vent of compressor, with additionally pour into the defrosting refrigerant into in the refrigerant pipeline of keeping away from air outlet one side of the shell body to the outer heat exchanger through the defrosting pipeline, increase the refrigerant flow, it is exothermic through the condensation of extra defrosting refrigerant, accelerate the defrosting process of the refrigerant pipeline of keeping away from air outlet one side of the shell body to outer heat exchanger, and then reduce outer heat exchanger and be close to the long difference when defrosting of the refrigerant pipeline of keeping away from air outlet one side when defrosting of the refrigerant pipeline of air outlet one side, thereby shorten outer heat exchanger complete machine defrosting operation required length, realize the homogenization defrosting, be favorable to improving the heat exchange efficiency of air.
It can be understood that, to outer quick-witted heat exchanger, the amount of wind of keeping away from air outlet one side is little, and heat exchange efficiency is low, frosts easily, and for being close to air outlet one side, keeps away from the defrosting operation consuming time of air outlet one side longer.
In addition, the multi-split air conditioner in the above technical solution provided by the present invention may further have the following additional technical features:
in the above technical solution, the multi-split air conditioner further includes: the first temperature sensor is arranged in a preset area of the plurality of refrigerant pipelines; and the second temperature sensor is arranged on an outlet pipe section of a refrigerant pipeline connected with the defrosting pipeline, wherein the refrigerant pipeline corresponding to the first temperature sensor is different from the refrigerant pipeline connected with the defrosting pipeline.
In the technical scheme, the first temperature sensors are arranged in the preset areas of the plurality of refrigerant pipelines, the second temperature sensors are arranged on the outlet pipe sections of the refrigerant pipelines connected with the defrosting pipeline, and the first temperature of the preset areas and the second temperature of the outlet pipe sections of the refrigerant pipelines connected with the defrosting pipeline are detected respectively to obtain temperature values of different positions on the outer machine heat exchanger to be used as a basis for judging whether the surface of the outer machine heat exchanger frosts. The refrigerant pipeline corresponding to the first temperature sensor and the refrigerant pipeline connected with the defrosting pipeline are different in a limiting mode, so that the first temperature sensor and the second temperature sensor are ensured to correspond to different refrigerant pipelines respectively, and the detection values of the first temperature sensor and the second temperature sensor are prevented from being repeated. The preset area can be any refrigerant pipeline except the refrigerant pipeline connected with the defrosting pipeline.
In the above technical solution, the multi-split air conditioner further includes: the control valve is arranged on the defrosting pipeline; and the microcontroller is electrically connected with the first temperature sensor, the second temperature sensor and the control valve so as to control the on-off of the control valve according to the first temperature acquired by the first temperature sensor and the second temperature acquired by the second temperature sensor.
In the technical scheme, the control valve is arranged on the defrosting pipeline to control the opening and closing of the defrosting pipeline according to the actual requirement of the outer machine heat exchanger. Through setting up and first temperature sensor, the microcontroller that second temperature sensor and control valve electricity are connected, make microcontroller can receive the first temperature that comes from first temperature sensor and second temperature sensor's second temperature, with whether the numerical value according to first temperature and second temperature judges to switch on or break off the pipeline of changing the frost, and control valve carries out corresponding operation, thereby carry out accurate control to the pipeline of changing the frost, improve the accuracy of the operation of changing the frost, it is long to be favorable to reducing the complete machine defrosting of outer machine heat exchanger, reduce the energy consumption simultaneously.
In the above technical solution, the multi-split air conditioner further includes: and the outer machine fan is arranged corresponding to the outer machine heat exchanger to realize heat dissipation of the outer machine heat exchanger.
In the technical scheme, the air flow on the surface of the outer machine heat exchanger is accelerated by arranging the outer machine fan corresponding to the outer machine heat exchanger, so that the heat dissipation effect of the outer machine heat exchanger is improved, the possibility of frosting the surface of the outer machine heat exchanger is reduced, and the heat exchange efficiency of the outer machine heat exchanger during working is improved.
In the above technical scheme, the top plate of the outer casing is provided with the air outlet, and the two ends of the defrosting pipeline are connected with the inlet pipe section of the refrigerant pipeline arranged at the bottom of the outer casing and the air outlet of the compressor.
In this technical scheme, be equipped with the air outlet on the roof of outer casing body, make outer casing body form top air-out structure, both ends through setting up the defrosting pipeline link to each other with the gas vent of the inlet pipe section of the refrigerant pipeline of locating outer casing body bottom and compressor, with pour into extra defrosting refrigerant into to the refrigerant pipeline of locating outer casing body bottom through the defrosting pipeline, the defrosting process of locating the refrigerant pipeline of outer casing body bottom with higher speed, thereby it is long when reducing outer machine heat exchanger's complete machine defrosting, be favorable to realizing outer machine heat exchanger's even defrosting.
In the above technical scheme, two ends of the defrosting pipeline are respectively connected with the inlet pipe section of the refrigerant pipeline farthest from the air outlet and the air outlet of the compressor.
In this technical scheme, link to each other with the gas vent of the inlet pipeline section of the refrigerant pipeline farthest from the air outlet and compressor respectively through the both ends that set up the defrosting pipeline to inject extra defrosting refrigerant in the refrigerant pipeline farthest from the air outlet through the defrosting pipeline, the defrosting process of locating the refrigerant pipeline of outer casing bottom with higher speed, thereby it is long when the complete machine defrosting of the outer machine heat exchanger of reduction is favorable to realizing the even defrosting of outer machine heat exchanger.
It can be understood that, for outer machine heat exchanger, the amount of wind of keeping away from air outlet one side is little, and heat exchange efficiency is low, frosts easily, and for being close to air outlet one side, keeps away from defrosting operation consuming time of air outlet one side longer
In a second aspect of the present invention, there is provided a defrosting method for a multi-split air conditioner in any one of the first aspect, where the defrosting method includes: acquiring a first temperature and a second temperature of different positions on an external machine heat exchanger in a multi-split air conditioner; determining a temperature difference between the first temperature and the second temperature; and controlling the on-off of a defrosting pipeline in the multi-split air conditioner according to the temperature difference.
According to the defrosting method in the technical scheme of the second aspect of the invention, the first temperature and the second temperature of different positions on the outer unit heat exchanger in the multi-split air conditioner are obtained, so that the first temperature and the second temperature are used as the basis for judging whether the surface of the outer unit heat exchanger is frosted or not. The temperature difference between the first temperature and the second temperature is detected through the first temperature sensor and the second temperature sensor, so that the temperature imbalance degree in the outer machine heat exchanger is determined through the temperature difference. Furthermore, the defrosting pipeline in the multi-connection air conditioner is controlled to be switched on or off according to the temperature difference, the defrosting pipeline can be switched on or off according to the actual operation requirement of the outer machine heat exchanger, the defrosting pipeline can be accurately controlled, the uniform defrosting operation of the outer machine heat exchanger is realized, the defrosting operation duration is shortened, the influence of a frost layer on ventilation and heat dissipation is reduced, and the heat exchange efficiency of the outer machine heat exchanger during working is improved.
In the above technical solution, acquiring the first temperature and the second temperature at different positions on the outdoor heat exchanger in the multi-split air conditioner specifically includes: acquiring first temperatures of preset areas of a plurality of refrigerant pipelines in a multi-split air conditioner; and acquiring a second temperature of an outlet pipe section of a refrigerant pipeline connected with the defrosting pipeline in the multi-split air conditioner, wherein the refrigerant pipeline corresponding to the second temperature is different from the refrigerant pipeline corresponding to the first temperature.
In the technical scheme, the first temperatures of the preset areas of the refrigerant pipelines in the multi-split air conditioner are obtained and used as the reference temperature values of the outer unit heat exchanger. The second temperature of the outlet pipe section of the refrigerant pipeline connected with the defrosting pipeline in the multi-split air conditioner is obtained, so that the second temperature is compared with the first temperature, the refrigerant pipeline connected with the defrosting pipeline in the outer machine heat exchanger is further determined, namely the temperature difference between the refrigerant pipeline on one side, away from the air outlet, of the outer machine heat exchanger and other refrigerant pipelines is used as a basis for controlling the on-off of the defrosting pipeline, and the accuracy of the defrosting method is improved.
In the above technical scheme, controlling the defrosting pipeline in the multi-split air conditioner to be turned on or off according to the temperature difference specifically includes: when the temperature difference is not less than a first temperature difference threshold value, the defrosting pipeline is controlled to be opened; when the temperature difference is not greater than a second temperature difference threshold value, controlling the defrosting pipeline to be closed; when the temperature difference is greater than a second temperature difference threshold value and smaller than a first temperature difference threshold value, controlling the defrosting pipeline to keep a current flowing state; wherein the first temperature difference threshold is greater than the second temperature difference threshold.
In this technical scheme, when the difference in temperature of first temperature and second temperature is not less than first difference in temperature threshold value, can confirm that the difference in temperature has surpassed normal scope this moment, the temperature of one side that the air outlet was kept away from to outer machine heat exchanger is obviously less than the temperature of other positions, outer machine heat exchanger keeps away from air outlet one side and frosts, and it is consuming time longer normally to change the frost, open through control defrosting pipeline, the refrigerant pipeline that keeps away from air outlet one side to outer machine heat exchanger pours into extra defrosting refrigerant, increase the refrigerant flow, in order to accelerate outer machine heat exchanger and keep away from the defrosting operation of air outlet one side, it is long when shortening whole defrosting. When the temperature difference is not greater than the second temperature difference threshold value, the temperature difference is determined to be within a normal range at the moment, the defrosting pipeline is controlled to be turned off, and extra defrosting refrigerants are stopped being injected into the refrigerant association on the side, far away from the air outlet, of the outer machine heat exchanger, so that the outer machine heat exchanger can normally operate. Wherein, through injecing that first difference in temperature threshold value is greater than the second difference in temperature threshold value, when the difference in temperature is greater than the second difference in temperature threshold value and is less than first difference in temperature threshold value, through control defrosting pipeline keep current flow state to provide the transition region that the difference in temperature changes, prevent frequently cutting off the defrosting pipeline at outer machine heat exchanger operation in-process, be favorable to reducing the influence to the normal operating condition of multi-connected air conditioner. Specifically, when the temperature difference is not less than the first temperature difference threshold value and enters a range which is greater than the second temperature difference threshold value and less than the first temperature difference threshold value, the defrosting pipeline is kept in an open state, a defrosting refrigerant is continuously injected into a refrigerant pipeline on one side of the external heat exchanger, which is far away from the air outlet, and defrosting is accelerated until the temperature difference is within a range which is not greater than the second temperature difference threshold value; when the temperature difference is larger than the second temperature difference threshold value and smaller than the first temperature difference threshold value from the second temperature difference threshold value, the defrosting pipeline is controlled to be kept in a closed state until the temperature difference is within the range not smaller than the first temperature difference threshold value.
In a third aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, which, when being executed by a processor, implements the steps of the defrosting method according to any one of the above-mentioned second aspect.
According to the computer-readable storage medium of the third aspect of the present invention, by storing the computer program on the computer-readable storage medium, the steps of the defrosting method in any one of the main aspects of the second aspect are implemented when the computer program is executed by the processor, so that the method has all the beneficial effects of the defrosting method in any one of the main aspects of the second aspect, and the details are not repeated herein.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 illustrates a schematic view of a defrosting system of a multi-split air conditioner according to an embodiment of the present invention;
fig. 2 illustrates a schematic view of a defrosting system of a multi-split air conditioner according to an embodiment of the present invention;
FIG. 3 shows a schematic flow diagram of a defrosting method according to an embodiment of the invention;
FIG. 4 shows a schematic flow diagram of a defrosting method according to an embodiment of the invention;
fig. 5 shows a schematic flow diagram of a defrosting method according to an embodiment of the invention.
Wherein, the corresponding relation between the reference numbers and the components in fig. 1 and fig. 2 is as follows:
the system comprises a compressor 1, an external machine heat exchanger 2, an internal machine heat exchanger 3, a first temperature sensor 41, a second temperature sensor 42, a defrosting pipeline 5, a control valve 51, a first pipeline 6, an oil separator 61, a second pipeline 7, a distributor 71 and an electronic expansion valve 72.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A multi-split air conditioner, a defrosting method, and a computer-readable storage medium according to some embodiments of the present invention are described below with reference to fig. 1 to 5.
Example one
The embodiment provides a multi-split air conditioner which can achieve uniform defrosting of an outer unit heat exchanger. Fig. 1 shows a schematic diagram of a defrosting system of a multi-split air conditioner including an outer casing (not shown), a compressor, an outer machine heat exchanger, and an inner machine heat exchanger. The compressor and the outer machine heat exchanger are arranged in the outer machine shell, and an air outlet is formed in the outer machine shell. Be equipped with a plurality of refrigerant pipelines on the outer machine heat exchanger, and the one end of every refrigerant pipeline all inserts to first pipeline to link to each other through the gas vent of first pipeline with the compressor, the other end of every refrigerant pipeline all inserts to the second pipeline, and links to each other through the one end of second pipeline with interior machine heat exchanger, and the other end of interior machine heat exchanger links to each other through the return-air port of second pipeline with the compressor. In addition, the exhaust port of the compressor is connected with a refrigerant pipeline on one side of the outer machine heat exchanger, which is far away from the air outlet, through a defrosting pipeline. Wherein, an oil separator is arranged in the first pipeline, and a distributor and an electronic expansion valve are arranged in the second pipeline between the outer machine heat exchanger and the inner machine heat exchanger.
In a defrosting mode, high-temperature and high-pressure gaseous refrigerants flowing out of an exhaust port of a compressor flow into a first pipeline, oil in the refrigerants are separated by an oil separator and then flow into a plurality of refrigerant pipelines of an external machine heat exchanger, the high-temperature and high-pressure gaseous refrigerants are condensed in the refrigerant pipelines to release heat and become low-temperature and high-pressure liquid refrigerants, and the released heat is used for defrosting the surface of the external machine heat exchanger; during another part high temperature high pressure refrigerant that the gas vent of compressor flowed out flows into the refrigerant pipeline of one side that the air outlet was kept away from to outer quick-witted heat exchanger through the pipeline of defrosting, increase the refrigerant flow in this refrigerant pipeline to the defrosting operation process that the air outlet one side was kept away from to outer quick-witted heat exchanger, thereby it is used long to reduce complete machine defrosting operation. The low-temperature high-pressure liquid refrigerant after condensation and heat release flows into the second pipeline from the other end of the refrigerant pipeline, sequentially flows into the distributor and the electronic expansion valve, forms low-temperature low-pressure liquid refrigerant through flow distribution of the distributor and throttling and pressure reduction of the electronic expansion valve, flows into the internal machine heat exchanger, is evaporated and absorbs heat in the internal machine heat exchanger to become low-pressure gaseous refrigerant, and flows back to the compressor through a gas return port of the compressor to finish primary defrosting circulation.
Example two
The embodiment provides a multi-split air conditioner which can achieve uniform defrosting of an outer unit heat exchanger. Fig. 2 shows a schematic diagram of a defrosting system of a multi-split air conditioner including an outer casing (not shown), a compressor, an outer machine heat exchanger, an inner machine heat exchanger, a control valve, a microcontroller (not shown), a first temperature sensor, and a second temperature sensor. The compressor and the outer machine heat exchanger are arranged in the outer machine shell, and an air outlet is formed in a top plate of the outer machine shell. Be equipped with a plurality of refrigerant pipelines on the outer machine heat exchanger, and the one end of every refrigerant pipeline all inserts to first pipeline to link to each other through the gas vent of first pipeline with the compressor, the other end of every refrigerant pipeline all inserts to the second pipeline, and links to each other through the one end of second pipeline with interior machine heat exchanger, and the other end of interior machine heat exchanger links to each other through the return-air port of second pipeline with the compressor. In addition, an exhaust port of the compressor is connected with a refrigerant pipeline which is arranged on one side of the outer machine heat exchanger, away from the air outlet, and farthest away from the air outlet through a defrosting pipeline, and a control valve is arranged in the defrosting pipeline; a first temperature sensor is arranged on an outlet pipe section of a middle refrigerant pipeline of the outer machine heat exchanger, and a second temperature sensor is arranged on an outlet pipe section of a refrigerant pipeline, which is far away from one side of the air outlet and is farthest away from the air outlet, of the outer machine heat exchanger; the microcontroller is respectively electrically connected with the control valve, the first temperature sensor and the second temperature sensor. Wherein, an oil separator is arranged in the first pipeline, and a distributor and an electronic expansion valve are arranged in the second pipeline between the outer machine heat exchanger and the inner machine heat exchanger.
In a defrosting mode, high-temperature and high-pressure gaseous refrigerants flowing out of an exhaust port of a compressor flow into a first pipeline, oil in the refrigerants are separated by an oil separator and then flow into a plurality of refrigerant pipelines of an external machine heat exchanger, the high-temperature and high-pressure gaseous refrigerants are condensed in the refrigerant pipelines to release heat and become low-temperature and high-pressure liquid refrigerants, and the released heat is used for defrosting the surface of the external machine heat exchanger; the microcontroller receives a first temperature detected by the first temperature sensor and a second temperature detected by the second temperature sensor, and controls the on-off of a control valve in the defrosting pipeline according to the temperature difference between the first temperature and the second temperature, so that when the temperature difference exceeds a threshold value, the control valve is controlled to conduct the defrosting pipeline, a part of high-temperature and high-pressure gaseous refrigerant additionally flows out of an exhaust port of the compressor, and flows into a refrigerant pipeline farthest from the air outlet in the outer machine heat exchanger through the defrosting pipeline, the refrigerant flow in the refrigerant pipeline is increased, the defrosting process of one side, far away from the air outlet, of the outer machine heat exchanger is accelerated, the time for the whole defrosting operation is shortened, and the defrosting control accuracy is improved. The low-temperature high-pressure liquid refrigerant after condensation and heat release flows into the second pipeline from the other end of the refrigerant pipeline, sequentially flows into the distributor and the electronic expansion valve, forms low-temperature low-pressure liquid refrigerant through flow distribution of the distributor and throttling and pressure reduction of the electronic expansion valve, flows into the internal machine heat exchanger, is evaporated and absorbs heat in the internal machine heat exchanger to become low-pressure gaseous refrigerant, and flows back to the compressor through a gas return port of the compressor to finish primary defrosting circulation.
EXAMPLE III
As shown in fig. 3, the present embodiment provides a defrosting method, including the following steps:
step S102, acquiring a first temperature and a second temperature of different positions on an external machine heat exchanger in the multi-split air conditioner;
step S104, determining the temperature difference between the first temperature and the second temperature;
and S106, controlling the defrosting pipeline in the multi-split air conditioner to be switched on or off according to the temperature difference.
According to the defrosting method in the embodiment, the first temperature and the second temperature of different positions on the outer unit heat exchanger in the multi-split air conditioner are obtained, the temperature difference between the first temperature and the second temperature is determined, the temperature imbalance degree in the outer unit heat exchanger is determined according to the temperature difference, the defrosting pipelines in the multi-split air conditioner are controlled to be turned on and off according to the actual temperature difference, the conventional defrosting operation is supplemented, the uniform defrosting of the outer unit heat exchanger is facilitated, the defrosting time is shortened, the ventilation and heat dissipation of the outer unit are reduced due to the fact that the defrosting affects, and the heat exchange efficiency of the outer unit heat exchanger is improved.
Example four
As shown in fig. 4, the present embodiment provides a defrosting method, including the following steps:
step S202, acquiring first temperatures of preset areas of a plurality of refrigerant pipelines in the multi-split air conditioner;
step S204, acquiring a second temperature of an outlet pipe section of a refrigerant pipeline connected with a defrosting pipeline in the multi-split air conditioner;
step S206, determining the temperature difference between the first temperature and the second temperature;
and S208, controlling the defrosting pipeline in the multi-split air conditioner to be switched on or off according to the temperature difference.
In the defrosting method in the embodiment, the first temperature is defined as a first temperature of a preset area of a plurality of refrigerant pipelines in an outer unit heat exchanger of the multi-split air conditioner, so that the first temperature is used as a reference temperature value; the second temperature is limited to be the temperature of an outlet pipe section of a refrigerant pipeline connected with the defrosting pipeline in the outer machine heat exchanger, namely the temperature of the outlet pipe section of the refrigerant pipeline far away from one side of the air outlet of the outer machine heat exchanger, so that the second temperature is compared with the first temperature, the temperature balance degree of the outer machine heat exchanger is determined, the frosting degree of the side, far away from the air outlet, of the outer machine heat exchanger is further judged, and the frosting degree is used as the basis for follow-up control of the on-off of the defrosting pipeline, and the defrosting method accuracy is improved.
EXAMPLE five
As shown in fig. 5, the present embodiment provides a defrosting method, including the following steps:
step S302, acquiring a first temperature and a second temperature of different positions on an external machine heat exchanger in a multi-split air conditioner;
step S304, determining the temperature difference between the first temperature and the second temperature;
step S306, judging the temperature range of the temperature difference;
if the temperature difference is greater than or equal to the first temperature difference threshold value, executing step S308, and controlling the defrosting pipeline to be opened;
if the temperature difference is less than or equal to the second temperature difference threshold value, executing the step S310 and controlling the defrosting pipeline to be closed;
if the temperature difference is greater than the second temperature difference threshold and smaller than the first temperature difference threshold, executing step S312, and controlling the defrosting pipeline to keep the current flowing state;
wherein the second temperature difference threshold is less than the first temperature difference threshold.
In the defrosting method in this embodiment, the first temperature and the second temperature at different positions on the outer unit heat exchanger are obtained, and the temperature difference between the first temperature and the second temperature is determined to be used as a basis for subsequently controlling the on/off of the defrosting pipeline. Specifically, the defrosting pipeline is controlled to be opened when the temperature difference is greater than or equal to a first temperature difference threshold value, and the defrosting pipeline is controlled to be closed when the temperature difference is less than or equal to a second temperature difference threshold value, so that the defrosting pipeline is controlled to be opened or closed according to different ranges of the temperature difference, and the accuracy of the defrosting method is further improved; and when the temperature difference is between the first temperature difference threshold value and the second temperature difference threshold value, the defrosting pipeline is controlled to keep the current flowing state so as to provide a middle transition range and prevent the defrosting pipeline from being frequently switched on and off to influence the normal work of the multi-split air conditioner. When the temperature difference is reduced to a range between the first temperature difference threshold and the second temperature difference threshold from a value greater than or equal to the first temperature difference threshold, the defrosting pipeline is kept continuously opened, and defrosting is accelerated until the temperature difference is reduced to a value less than or equal to the second temperature difference threshold; when the temperature difference rises from the second temperature difference threshold value to the range between the first temperature difference threshold value and the second temperature difference threshold value, the defrosting pipeline is kept disconnected, and defrosting is carried out conventionally until the temperature difference rises to the range larger than or equal to the first temperature difference threshold value.
EXAMPLE six
The present embodiment provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the steps of the defrosting method according to any one of the third to fifth embodiments may be implemented to improve the accuracy of the control process of the defrosting method.
The technical scheme of the invention is explained in detail by combining the drawings, can effectively accelerate the defrosting process of the side, away from the air outlet, of the external machine heat exchanger in the multi-split air conditioner, shorten the defrosting time of the whole machine, reduce the influence of frosting on the ventilation and heat dissipation of the external machine heat exchanger, and is beneficial to improving the heat exchange efficiency of the external machine heat exchanger.
In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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 above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A multi-split air conditioner, comprising:
the air outlet is arranged on the outer shell;
the compressor is arranged in the outer machine shell;
the outdoor unit heat exchanger is arranged in the outdoor unit shell, a plurality of refrigerant pipelines are arranged on the outdoor unit heat exchanger, and one end of each refrigerant pipeline is connected with an exhaust port of the compressor;
one end of each indoor unit heat exchanger is connected with at least one refrigerant pipeline, and the other end of each indoor unit heat exchanger is connected to a return air port of the compressor;
and the two ends of the defrosting pipeline are respectively connected with an inlet pipe section of the refrigerant pipeline positioned on one side far away from the air outlet and the air outlet of the compressor.
2. A multi-split air conditioner as set forth in claim 1, further comprising:
the first temperature sensor is arranged in a preset area of the refrigerant pipelines;
a second temperature sensor arranged on the outlet pipe section of the refrigerant pipeline connected with the defrosting pipeline,
the refrigerant pipeline corresponding to the first temperature sensor is different from the refrigerant pipeline connected with the defrosting pipeline.
3. A multi-split air conditioner as set forth in claim 2, further comprising:
the control valve is arranged on the defrosting pipeline;
and the microcontroller is electrically connected with the first temperature sensor, the second temperature sensor and the control valve so as to control the on-off of the control valve according to the first temperature acquired by the first temperature sensor and the second temperature acquired by the second temperature sensor.
4. A multi-split air conditioner as set forth in claim 2, further comprising:
and the outer machine fan is arranged corresponding to the outer machine heat exchanger to dissipate heat of the outer machine heat exchanger.
5. A multi-split air conditioner as recited in claim 1,
the top plate of the outer shell is provided with an air outlet, and two ends of the defrosting pipeline are connected with an inlet pipe section of a refrigerant pipeline arranged at the bottom of the outer shell and an air outlet of the compressor.
6. A multi-split air conditioner as recited in claim 1, wherein both ends of the defrosting pipe are connected to an inlet pipe section of the refrigerant pipe farthest from the air outlet and an air outlet of the compressor, respectively.
7. A defrosting method for a multi-split air conditioner as claimed in any one of claims 1 to 6, comprising:
acquiring a first temperature and a second temperature of different positions on the outer unit heat exchanger in the multi-split air conditioner;
determining a temperature difference between the first temperature and the second temperature;
and controlling the defrosting pipeline in the multi-split air conditioner to be switched on or off according to the temperature difference.
8. The defrosting method according to claim 7, wherein the obtaining of the first temperature and the second temperature at different positions on the outer unit heat exchanger in the multi-split air conditioner specifically comprises:
acquiring first temperatures of preset areas of a plurality of refrigerant pipelines in the multi-split air conditioner;
acquiring a second temperature of an outlet pipe section of a refrigerant pipeline connected with the defrosting pipeline in the multi-split air conditioner,
the refrigerant pipeline corresponding to the second temperature is different from the refrigerant pipeline corresponding to the first temperature.
9. The defrosting method according to claim 7, wherein the controlling of the defrosting pipeline in the multi-split air conditioner to be turned on and off according to the temperature difference specifically comprises:
when the temperature difference is not less than a first temperature difference threshold value, controlling the defrosting pipeline to be opened;
when the temperature difference is not greater than a second temperature difference threshold value, controlling the defrosting pipeline to be turned off;
when the temperature difference is greater than the second temperature difference threshold value and smaller than the first temperature difference threshold value, controlling the defrosting pipeline to keep a current flowing state;
wherein the first temperature difference threshold is greater than the second temperature difference threshold.
10. A computer-readable storage medium, having a computer program stored thereon, wherein the computer program, when executed by a processor, performs the steps of defrosting according to any one of claims 7 to 9.
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