CN115164458A - Air conditioner and oil blockage prevention control method thereof - Google Patents
Air conditioner and oil blockage prevention control method thereof Download PDFInfo
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- CN115164458A CN115164458A CN202210885025.9A CN202210885025A CN115164458A CN 115164458 A CN115164458 A CN 115164458A CN 202210885025 A CN202210885025 A CN 202210885025A CN 115164458 A CN115164458 A CN 115164458A
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- 238000000034 method Methods 0.000 title claims abstract description 61
- 230000002265 prevention Effects 0.000 title claims abstract description 31
- 239000003507 refrigerant Substances 0.000 claims abstract description 124
- 238000010438 heat treatment Methods 0.000 claims abstract description 113
- 238000010257 thawing Methods 0.000 claims abstract description 112
- 238000005338 heat storage Methods 0.000 claims abstract description 66
- 238000004321 preservation Methods 0.000 claims abstract description 51
- 238000005057 refrigeration Methods 0.000 claims abstract description 39
- 238000009413 insulation Methods 0.000 claims abstract description 18
- 230000009471 action Effects 0.000 claims description 32
- 238000009825 accumulation Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 239000003921 oil Substances 0.000 abstract description 121
- 230000008569 process Effects 0.000 abstract description 24
- 239000010726 refrigerant oil Substances 0.000 abstract 1
- 239000010687 lubricating oil Substances 0.000 description 36
- 239000002699 waste material Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 6
- 239000010721 machine oil Substances 0.000 description 6
- 230000002411 adverse Effects 0.000 description 5
- 238000004378 air conditioning Methods 0.000 description 5
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 4
- 230000005494 condensation Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000001294 propane Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
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- 239000000155 melt Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
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- 239000011232 storage material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Images
Classifications
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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
- F25B41/40—Fluid line arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
-
- 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
- F25B43/003—Filters
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
- F25D21/12—Removing frost by hot-fluid circulating system separate from the refrigerant system
- F25D21/125—Removing frost by hot-fluid circulating system separate from the refrigerant system the hot fluid being ambient air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
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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
Abstract
The invention discloses an air conditioner and an oil blockage prevention control method thereof, wherein the air conditioner comprises: the refrigeration system comprises a refrigeration system and a refrigeration cycle loop, wherein a branch exhaust pipe is arranged in the refrigeration cycle loop, and a branch electronic expansion valve is arranged at one end of the branch exhaust pipe close to a compressor; the heat storage and insulation module is arranged on the branch exhaust pipe and wraps the main electronic expansion valve; the controller is used for: according to the running state of the air conditioner, the opening or closing of the branch electronic expansion is controlled by combining the outdoor environment temperature, the post-valve temperature and the outdoor coil pipe temperature, so that when the branch electronic expansion valve is in the opening state, the heat storage and heat preservation module stores the heat of the refrigerant flowing through the branch exhaust pipe and transfers the heat to the main electronic expansion valve, and the main electronic expansion valve and the two filters connected to the two ends of the main electronic expansion valve are heated. The invention can effectively prevent the refrigerant oil blockage phenomenon in the low-temperature heating starting and defrosting processes of the air conditioner, thereby improving the safety and the reliability of the operation of the air conditioner.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner and an oil blockage prevention control method thereof.
Background
Currently, refrigerants of R290 (Propane), R32 (Propane), and other low GWPs (Global Warming Potential) have attracted attention as novel environmentally friendly refrigerants, and have begun to be widely used in small refrigeration devices such as home air conditioners. Because refrigerants such as R290 and R32 belong to flammable refrigerants, the danger level is high, and on the basis of safety consideration, strict limitation is imposed on the charging amount of the refrigerants when products are applied, so that the operation pressure of a refrigeration system adopting the R290 refrigerants is low, particularly the operation pressure is lower when the air conditioner is heated at low temperature, so that in order to increase the refrigerating and heating capacity of the air conditioner, the limitation of the charging amount of the refrigerants is mainly counteracted by increasing the discharge capacity of a compressor or increasing the circulating amount of the refrigerants, and the phenomenon of oil blockage is caused in a low-temperature starting stage or a defrosting switching stage.
The refrigerating machine oil in the compressor used by the air conditioner plays an important role in the operation of a refrigerating system, and the refrigerating machine oil lubricates, seals and cools the cylinder and the rotor of the compressor, so how to ensure the efficient and safe operation of the compressor is more important for the R290 refrigerant. Most of refrigerating machine oil used by the existing compressor is common mineral refrigerating machine oil, and the viscosity of the refrigerating machine oil can be increased sharply under the low-temperature condition.
In an air conditioner product using the R290 refrigerant, when the air conditioner is started at low temperature for heating, low-temperature refrigerator oil in a pipeline and the R290 refrigerant are easy to form floccules, and the floccules are easy to accumulate in a valve when passing through an electronic expansion valve and a filter behind the valve at low temperature, so that the blockage (commonly called as oil blockage) of a refrigeration system is caused, the balance of the system is damaged, the safety and the reliability of the system are threatened, the starting difficulty of the air conditioner is caused, and the complete machine fault of the air conditioner is caused in serious cases. Therefore, how to effectively prevent the blockage of the throttling device and ensure that the refrigerating machine oil in the compressor is at the optimal temperature when the compressor is started and operated under the low-temperature condition, and the good lubricating performance is one of the problems of ensuring the normal operation of the air conditioner.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention aims to provide an air conditioner and an oil blockage prevention control method thereof.
The invention provides an air conditioner, comprising: the refrigeration system is used for exchanging the positions of the air suction and exhaust pipes in the refrigeration circulation loop so as to heat indoor air by using the evaporator to realize the heating operation of the air conditioner, and comprises a compressor, wherein the compressor is used for compressing low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharging the high-temperature and high-pressure refrigerant gas to a condenser; the refrigeration cycle loop is used for circulating a refrigerant in a loop consisting of the compressor, the indoor heat exchanger, the four-way valve, the outdoor heat exchanger and the main electronic expansion valve, wherein two ends of the main electronic expansion valve are respectively connected with a filter; the exhaust end of the compressor is connected with one end of the four-way valve through an exhaust pipeline, the exhaust pipeline comprises a main exhaust pipe and a branch exhaust pipe which are connected in parallel, the branch exhaust pipe is arranged close to the main electronic expansion valve, one end of the branch exhaust pipe close to the compressor is provided with a branch electronic expansion valve, and two ends of the branch electronic expansion valve are respectively connected with a filter; the heat storage and insulation module is arranged on the branch exhaust pipe and wraps the main electronic expansion valve and the two filters connected to the two ends of the main electronic expansion valve; an outdoor environment temperature sensor for detecting an outdoor environment temperature; the temperature sensor behind the valve is arranged at one end of the main electronic expansion valve close to the compressor and used for detecting the temperature behind the valve of the main electronic expansion valve; the outdoor coil temperature sensor is arranged on the outdoor heat exchanger and used for detecting the temperature of the outdoor coil; a controller configured to: the method comprises the steps of obtaining the running state of the air conditioner, controlling the opening or closing of branch electronic expansion by combining the outdoor environment temperature, the post-valve temperature and the outdoor coil pipe temperature according to the running state of the air conditioner, enabling the heat storage and heat preservation module to store the heat of a refrigerant flowing through the branch exhaust pipe when the branch electronic expansion valve is in the opening state, and transferring the heat to the main electronic expansion valve and the two filters connected to the two ends of the main electronic expansion valve so as to heat the main electronic expansion valve and the two filters connected to the two ends of the main electronic expansion valve.
According to the air conditioner provided by the embodiment of the invention, a branch exhaust pipe of a compressor exhaust pipeline and a heat storage and heat preservation module positioned on the branch exhaust pipe are designed, and a heat source is led out separately to heat the heat storage and heat preservation module. The air conditioner utilizes the exhaust temperature to balance the problem of oil blockage behind a main electronic expansion valve in the low-temperature heating starting and defrosting processes, utilizes the principle that the exhaust temperature is higher when the oil blockage is more serious to correct the oil blockage degree, and pre-prevents adverse effects caused by the oil blockage; meanwhile, the air conditioner has the advantages of simple structure, fewer design parts, low cost and high reliability.
In addition, the air conditioner according to the embodiment of the invention may further have the following additional technical features:
in an embodiment of the invention, the control appliance is configured to: determining whether the outdoor environment temperature reaches a preset environment temperature threshold value when the air conditioner is started and performs heating operation; if the outdoor environment temperature does not reach the environment temperature threshold value, controlling the branch electronic expansion valve to be in an opening state at a preset opening degree; and if the outdoor environment temperature reaches the environment temperature threshold value, controlling the branch electronic expansion valve to close.
In an embodiment of the invention, after determining that the outdoor ambient temperature does not meet the ambient temperature threshold, the controller is further configured to: judging whether the post-valve temperature of the main electronic expansion valve reaches a preset first pour point temperature threshold value or not; if the post-valve temperature of the main electronic expansion valve reaches the first pour point temperature threshold value, controlling the branch electronic expansion to be in an open state by the preset opening degree; if the post-valve temperature of the main electronic expansion valve does not reach the first pour point temperature threshold value, controlling the branch electronic expansion valve to execute a first preset action, wherein the first preset action comprises the following steps: and the branch electronic expansion valve is opened at the preset opening degree, the opening degree is gradually increased according to the increment of the preset opening degree, and the branch electronic expansion valve is controlled to be closed until the post-valve temperature of the main electronic expansion valve reaches a preset second pour point temperature threshold value, wherein the second pour point temperature threshold value is larger than the first pour point temperature threshold value.
In an embodiment of the invention, after determining that the outdoor ambient temperature does not reach the ambient temperature threshold, the controller is further configured to: judging whether the temperature of the outdoor coil reaches a preset defrosting temperature threshold value or not; if the temperature of the defrosting temperature outdoor coil does not reach the defrosting temperature threshold, controlling the branch electronic expansion valve to be in an open state by a preset opening degree, and further judging whether the post-valve temperature of the main electronic expansion valve reaches a preset third pour point temperature threshold; if the post-valve temperature of the main electronic expansion valve reaches the third pour point temperature threshold value, controlling the branch electronic expansion to be in an open state by the preset opening degree; if the post-valve temperature of the main electronic expansion valve does not reach the third pour point temperature threshold value, controlling the branch electronic expansion valve to execute a second preset action, wherein the second preset action comprises the following steps: and the branch electronic expansion valve is opened at the preset opening degree, the opening degree is gradually increased according to the increment of the preset opening degree, and the branch electronic expansion valve is controlled to be closed until the post-valve temperature of the main electronic expansion valve reaches a preset fourth pour point temperature, wherein the fourth pour point temperature is higher than the third pour point temperature.
In an embodiment of the invention, the controller is further configured to: and when the temperature of the outdoor coil reaches the defrosting temperature threshold value, controlling the branch electronic expansion valve to be in an opening state at a preset opening degree.
In an embodiment of the invention, the controller is further configured to: and controlling the branch electronic expansion valve to be in a closed state when the air conditioner is determined to be not in heating operation.
In an embodiment of the present invention, the heat storage and preservation module is disposed at a return bend of the branch exhaust pipe.
Aiming at the existing problems, the invention also provides an oil blockage prevention control method of the air conditioner, which comprises the following steps: acquiring the running state of the air conditioner, the outdoor environment temperature, the temperature behind a valve at the rear end of a main electronic expansion valve in a refrigeration cycle loop and the temperature of an outdoor coil of an outdoor heat exchanger; according to the running state of the air conditioner, the opening or closing of branch electronic expansion in the refrigeration cycle loop is controlled by combining the outdoor environment temperature, the post-valve temperature and the outdoor coil pipe temperature, so that when the branch electronic expansion valve is in an opening state, a heat storage and heat preservation module stores heat of a refrigerant flowing through a branch exhaust pipe and transfers the heat to a main electronic expansion valve and two filters connected to two ends of the main electronic expansion valve so as to heat the main electronic expansion valve and the two filters connected to two ends of the main electronic expansion valve, wherein the branch exhaust pipe is arranged close to the main electronic expansion valve, and the heat storage and heat preservation module is arranged on the branch exhaust pipe and wraps the main electronic expansion valve and the two filters connected to two ends of the main electronic expansion valve.
According to the oil blockage prevention control method of the air conditioner, a branch exhaust pipe of an exhaust pipeline of the compressor and a heat storage and heat preservation module positioned on the branch exhaust pipe are designed, and a heat source is led out to heat the heat storage and heat preservation module. The method comprises the steps of balancing the problem of oil blockage behind a main electronic expansion valve in the low-temperature heating starting and defrosting processes by utilizing the exhaust temperature, correcting the oil blockage degree by utilizing the principle that the exhaust temperature is higher when the oil blockage is serious, preventing adverse effects caused by the oil blockage, opening branch electronic expansion valves on branch exhaust pipes in the low-temperature heating starting and defrosting switching processes, enabling part of high-temperature refrigerants in the exhaust pipes to enter the branch exhaust pipes, enabling the branch exhaust pipes to be close to the main electronic expansion valve on a total flow path, wrapping the branch exhaust pipes with heat storage and heat preservation modules to prevent heat loss, heating the heat storage and heat preservation modules by utilizing the high-temperature refrigerants in the branch exhaust pipes, and transmitting the heat to the main electronic expansion valve to heat the branch exhaust pipes, so that the oil blockage phenomenon in the refrigerant low-temperature heating or defrosting switching heating processes is effectively prevented and improved, and the reliability and the safety of the air conditioner are improved.
In addition, the oil blockage prevention control method of the air conditioner according to the embodiment of the invention can also have the following additional technical characteristics:
in an embodiment of the present invention, controlling the opening or closing of the branch electronic expansion in the refrigeration cycle in combination with the outdoor ambient temperature, the post-valve temperature, and the outdoor coil temperature according to the operation state of the air conditioner includes: determining whether the outdoor environment temperature reaches a preset environment temperature threshold value when the air conditioner is started and performs heating operation; if the outdoor environment temperature does not reach the environment temperature threshold value, controlling the branch electronic expansion valve to be in an opening state at a preset opening degree; and if the outdoor environment temperature reaches the environment temperature threshold value, controlling the branch electronic expansion valve to close.
In an embodiment of the present invention, after determining that the outdoor ambient temperature does not reach the ambient temperature threshold, the method further includes: judging whether the post-valve temperature of the main electronic expansion valve reaches a preset first pour point temperature threshold value or not; if the post-valve temperature of the main electronic expansion valve reaches the first pour point temperature threshold value, controlling the branch electronic expansion to be in an open state by the preset opening degree; if the post-valve temperature of the main electronic expansion valve does not reach the first pour point temperature threshold value, controlling the branch electronic expansion valve to execute a first preset action, wherein the first preset action comprises the following steps: and the branch electronic expansion valve is opened at the preset opening degree, the opening degree is gradually increased according to the increment of the preset opening degree, and the branch electronic expansion valve is controlled to be closed until the post-valve temperature of the main electronic expansion valve reaches a preset second pour point temperature threshold value, wherein the second pour point temperature threshold value is larger than the first pour point temperature threshold value.
In an embodiment of the present invention, after determining that the outdoor ambient temperature does not reach the ambient temperature threshold, the method further includes: judging whether the temperature of the outdoor coil reaches a preset defrosting temperature threshold value or not; if the temperature of the defrosting temperature outdoor coil does not reach the defrosting temperature threshold, controlling the branch electronic expansion valve to be in an open state by a preset opening degree, and further judging whether the post-valve temperature of the main electronic expansion valve reaches a preset third pour point temperature threshold; if the post-valve temperature of the main electronic expansion valve reaches the third pour point temperature threshold value, controlling the branch electronic expansion to be in an open state by the preset opening degree; if the post-valve temperature of the main electronic expansion valve does not reach the third pour point temperature threshold value, controlling the branch electronic expansion valve to execute a second preset action, wherein the second preset action comprises the following steps: and the branch electronic expansion valve is opened at the preset opening degree, the opening degree is gradually increased according to the increment of the preset opening degree, and the branch electronic expansion valve is controlled to be closed until the post-valve temperature of the main electronic expansion valve reaches a preset fourth pour point temperature, wherein the fourth pour point temperature is higher than the third pour point temperature.
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 is a schematic structural view of an air conditioner according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a refrigerant circulation circuit according to an embodiment of the invention;
fig. 3 is a flowchart illustrating an overall execution of a controller of an air conditioner according to an embodiment of the present invention;
fig. 4 is a flowchart of an oil blockage prevention control method of an air conditioner according to an embodiment of the present invention;
fig. 5 is a flowchart of an oil blockage prevention control method of an air conditioner according to another embodiment of the present invention;
fig. 6 is a flowchart of an oil blockage prevention control method of an air conditioner according to still another embodiment of the present invention;
fig. 7 is a flowchart of an oil blockage prevention control method of an air conditioner according to still another embodiment of the present invention.
Reference numerals are as follows:
1000-air conditioner;
100-a refrigeration system; 110-a refrigeration cycle loop;
1-a compressor; 2-indoor heat exchanger; 3-outdoor ambient temperature sensor; 4-a four-way valve; 5-outdoor heat exchanger; 6-outdoor coil temperature sensor; 7-main electronic expansion valve; 8-a filter; 9-branch electronic expansion valve; 10-heat storage and insulation module; 11-post-valve temperature sensor;
200-a controller.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
The air conditioner of the present invention performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged. The condenser and the evaporator both belong to heat exchangers, and when the heat exchangers realize a condensation function, the condenser is used as the condenser, and when the heat exchangers realize an evaporation function, the evaporator is used as the evaporator.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.
In the air conditioner of the present invention, during heating operation, high-temperature and high-pressure refrigerant discharged from a compressor flows into a condenser. In this case, the condenser functions as a radiator. Therefore, the refrigerant heats the indoor air by heat exchange with the indoor air as it flows through the condenser, and is cooled by radiating heat. The low-temperature high-pressure refrigerant deprived of the temperature by the condenser is decompressed by the expansion valve and changes into a low-temperature low-pressure refrigerant. The refrigerant flowing into the evaporator through the expansion valve is heated by heat exchange with outdoor air. Then, the gas refrigerant, which is mainly low in temperature, is drawn from the evaporator into the compressor via the accumulator.
An air conditioner and an oil blockage prevention control method thereof according to an embodiment of the present invention will be described below with reference to fig. 1 to 7.
First, an air conditioner according to an embodiment of the present invention will be described with reference to fig. 1 to 3.
Fig. 1 is a schematic structural view of an air conditioner according to an embodiment of the present invention. As shown in fig. 1, an air conditioner 1000 according to an embodiment of the present invention includes: a refrigeration system 100, a heat storage and preservation module 10, an outdoor ambient temperature sensor 3, a post-valve temperature sensor 11, an outdoor coil temperature sensor 6, and a controller 200. The refrigeration system 100 includes, among other things, a refrigeration cycle circuit 110.
As shown in fig. 2, the refrigeration cycle 110 includes a compressor 1, an indoor heat exchanger 2, a four-way valve 4, an outdoor heat exchanger 5, and a main electronic expansion valve 7; two filters 8 arranged at both ends of the main electronic expansion valve 7, a branch electronic expansion valve 9, and two filters 8 arranged at both ends of the branch electronic expansion valve 9.
Wherein, the outdoor environment temperature sensor 3 is arranged on the indoor heat exchanger 2 and used for detecting the outdoor environment temperature.
A post-valve temperature sensor 11 is provided at an end of the main electronic expansion valve 7 near the compressor 1 for detecting a post-valve temperature of the main electronic expansion valve 7, i.e., a temperature at a rear end of the main electronic expansion valve 7.
The outdoor coil temperature sensor 6 is arranged on the outdoor heat exchanger 5 and used for detecting the outdoor coil temperature of the outdoor heat exchanger 5.
Specifically, the refrigeration system 100 is configured to swap the positions of the intake and exhaust pipes in the refrigeration cycle 110 to heat the indoor air by using the evaporator, so as to implement the heating operation of the air conditioner 1000, and the refrigeration system 100 includes a compressor 1, where the compressor 1 is configured to perform an operation of compressing a low-temperature and low-pressure refrigerant gas into a high-temperature and high-pressure refrigerant gas and discharging the refrigerant gas to the condenser.
As shown in fig. 2, the refrigeration cycle circuit 110 is configured to circulate a refrigerant through a circuit including a compressor 1, an indoor heat exchanger 2, a four-way valve 4, an outdoor heat exchanger 5, and a main electronic expansion valve 7, wherein two ends of the main electronic expansion valve 7 are connected to a filter 8, respectively.
Referring to fig. 2, an exhaust end of the compressor 1 is connected to one end of the four-way valve 4 through an exhaust pipe, the exhaust pipe includes a main exhaust pipe and a branch exhaust pipe connected in parallel, the branch exhaust pipe is disposed adjacent to the main electronic expansion valve 7, that is, the branch exhaust pipe is disposed adjacent to the main electronic expansion valve 7, one end of the branch exhaust pipe adjacent to the compressor 1 is provided with a branch electronic expansion valve 9, and two ends of the branch electronic expansion valve 9 are respectively connected to a filter 8.
The heat storage and preservation module 10 is arranged on the branch exhaust pipe and wraps the main electronic expansion valve 7 and the two filters 8 connected to the two ends of the main electronic expansion valve 7, furthermore, when the branch electronic expansion valve 9 is in an open state, the branch exhaust pipe is communicated, the refrigerant flows into the branch exhaust pipe, the heat storage and preservation module 10 can store the heat of the refrigerant flowing through the branch exhaust pipe and transfer the heat to the main electronic expansion valve 7 and the two filters 8 connected to the two ends of the main electronic expansion valve 7, so as to heat the main electronic expansion valve 7 and the two filters 8 connected to the two ends of the main electronic expansion valve 7. In an embodiment, the heat storage and preservation module 10 includes a heat storage material and a heat preservation material, which can effectively prevent heat loss, thereby achieving heat storage and preservation and heat transfer.
Based on the above structure, the controller 200 is configured to: the method comprises the steps of obtaining the running state of the air conditioner 1000, controlling the opening or closing of branch electronic expansion by combining outdoor environment temperature, post-valve temperature and outdoor coil temperature according to the running state of the air conditioner 1000, enabling a refrigerant to flow into a branch exhaust pipe when a branch electronic expansion valve 9 is in the opening state, enabling a heat storage and insulation module 10 to store heat of the refrigerant flowing through the branch exhaust pipe, transmitting the heat to a main electronic expansion valve 7 and two filters 8 connected to two ends of the main electronic expansion valve 7, heating the main electronic expansion valve 7 and the two filters 8 connected to two ends of the main electronic expansion valve 7, effectively preventing and improving oil blockage phenomena in the low-temperature heating or defrosting switching heating process of the refrigerant, and improving the running reliability and safety of the air conditioner.
In summary, in the air conditioner 1000 of the present invention, by designing the branch exhaust pipe of the compressor 1 and the heat storage and insulation module 10 located on the branch exhaust pipe, a heat source is separately led out to heat the heat storage and insulation module 10, when the main electronic expansion valve 7 and the filters 8 in front of and behind the main electronic expansion valve generate oil blockage during low-temperature heating start and defrosting switching of the air conditioner 1000, the exhaust temperature of the compressor 1 will become higher and higher, the heat caused by the exhaust temperature is stored in the heat storage and insulation module 10 by controlling the branch electronic expansion valve 9 on the branch exhaust pipe, and then the heat is transferred to the main electronic expansion valve 7 and the filters 8 in front of and behind the main electronic expansion valve 7, which are wrapped in the branch exhaust pipe, so as to melt and prevent the oil blockage of the main electronic expansion valve 7 and the filters 8 in front of and behind the main electronic expansion valve 7. That is, the air conditioner 1000 balances the problem of oil blockage behind the main electronic expansion valve 7 in the low-temperature heating starting and defrosting processes by using the exhaust temperature, corrects the oil blockage degree by using the principle that the exhaust temperature is higher when the oil blockage is more serious, pre-prevents adverse effects caused by the oil blockage, opens the branch electronic expansion valve 9 on the branch exhaust pipe in the low-temperature heating starting and defrosting switching processes, allows part of the high-temperature refrigerant in the exhaust pipe to enter the branch exhaust pipe, the branch exhaust pipe is close to the main electronic expansion valve 7 on the total flow path, and is externally coated with the heat storage and insulation module 10 to prevent heat loss, and transfers heat to the main electronic expansion valve 7 to heat the heat storage and insulation module 10 after the high-temperature refrigerant in the branch exhaust pipe is used to heat the heat storage and insulation module, so as to effectively prevent and improve the oil blockage phenomenon in the low-temperature heating or defrosting switching heating process, thereby improving the reliability and safety of the air conditioner operation; meanwhile, the air conditioner 1000 has a simple structure, fewer design parts, low cost and high reliability.
In one embodiment of the present invention, the controller 200 is specifically configured to: determining whether the outdoor environment temperature reaches a preset environment temperature threshold value when the air conditioner 1000 is started and performs heating operation; if the outdoor environment temperature does not reach the environment temperature threshold value, controlling the branch electronic expansion valve 9 to be in an open state at a preset opening degree; and if the outdoor environment temperature reaches the environment temperature threshold value, controlling the branch electronic expansion valve 9 to close.
Specifically, the preset ambient temperature threshold is a preset temperature value, which is set according to, for example, whether the outdoor ambient temperature is low or not, when the outdoor ambient temperature reaches the preset ambient temperature threshold, it is determined that the outdoor ambient is not the low-temperature operating condition, and when the outdoor ambient temperature does not reach the preset ambient temperature threshold, it is determined that the outdoor ambient is the low-temperature operating condition. In a specific embodiment, the preset threshold value of the environmental temperature is, for example, 7 ℃, that is, when the outdoor environmental temperature reaches 7 ℃, the outdoor environment is considered not to be the low-temperature working condition, and when the outdoor environmental temperature does not reach 7 ℃, the outdoor environment is considered to be the low-temperature working condition.
Specifically, when it is determined that the air conditioner 1000 is turned on and performs heating operation, and the outdoor ambient temperature does not reach the preset ambient temperature threshold, if 7 ℃, it is determined that the ambient temperature is high, that is, the air conditioner is in a low-temperature heating starting condition, and oil blockage is likely to occur, the branch electronic expansion valve 9 is controlled to be in an open state at a preset opening degree, so that the refrigerant flows into the branch exhaust pipe, and the heat storage and insulation module 10 stores heat of the refrigerant flowing through the branch exhaust pipe, and transfers the heat to the main electronic expansion valve 7 and the two filters 8 connected to the two ends of the main electronic expansion valve 7, so as to heat the main electronic expansion valve 7 and the two filters 8 connected to the two ends of the main electronic expansion valve 7, thereby effectively preventing and improving oil blockage during the heating process of the refrigerant heating at a low temperature or during switching of defrosting, and thus improving reliability and safety of the air conditioner operation. If it is determined that the air conditioner 1000 is turned on and is in heating operation and the outdoor ambient temperature reaches the preset ambient temperature threshold, if 7 ℃, it is determined that the ambient temperature is high at this time, that is, the air conditioner is not in a low-temperature heating start condition and is not prone to oil blockage, the branch electronic expansion valve 9 is controlled to be in a closed state, so that the refrigerant does not flow into the branch exhaust pipe, the air conditioner is in normal operation, and the refrigerant only passes through the main exhaust pipe, thereby avoiding waste of refrigerant flow.
In an embodiment of the invention, after determining that the outdoor ambient temperature does not reach the ambient temperature threshold, the controller 200 is further configured to: judging whether the post-valve temperature of the main electronic expansion valve 7 reaches a preset first pour point temperature threshold value; if the post-valve temperature of the main electronic expansion valve 7 reaches the first pour point temperature threshold, controlling the branch electronic expansion to be in an open state by a preset opening degree; if the post-valve temperature of the main electronic expansion valve 7 does not reach the first pour point temperature threshold, the branch electronic expansion valve 9 is controlled to execute a first preset action, wherein the first preset action comprises: the branch electronic expansion valve 9 is opened at a preset opening degree, and the opening degree is gradually increased according to a preset opening degree increase amount until the post-valve temperature of the main electronic expansion valve 7 reaches a preset second pour point temperature threshold value, and the branch electronic expansion valve 9 is controlled to be closed, wherein the second pour point temperature threshold value is larger than the first pour point temperature threshold value. Therefore, the oil blockage prevention protection of the low-temperature heating start of the air conditioner is completed.
Specifically, the first pour point temperature threshold value is a preset temperature value set, for example, in order to evaluate whether the engine lubricating oil reaches the lowest temperature at which the engine lubricating oil is about to be condensed, and when it is judged that the post-valve temperature of the main electronic expansion valve 7 reaches the preset first pour point temperature threshold value, it is considered that the engine lubricating oil is about to be condensed, and that oil clogging is about to occur; when the post-valve temperature of the main electronic expansion valve 7 is judged not to reach the preset first pour point temperature threshold value, the engine lubricating oil is considered to be condensed, namely, oil blockage occurs.
The second pour point temperature is a preset temperature value, and when the post-valve temperature of the main electronic expansion valve 7 is judged to reach the preset second pour point temperature threshold value, the temperature of the engine lubricating oil is considered to be high, and oil blockage cannot occur. The second pour point temperature is greater than the first pour point temperature. In one embodiment, to ensure the accuracy and reliability of the anti-oil blockage control, the second pour point temperature may be set to be the sum of the first pour point temperature and a first predetermined temperature margin, where the first predetermined temperature margin is denoted as λ, and λ is, for example, in a range of 0-20 ℃.
Specifically, after determining that the outdoor ambient temperature does not reach the ambient temperature threshold value, it is further determined whether the post-valve temperature of the main electronic expansion valve 7 reaches a preset first pour point temperature threshold value; if the post-valve temperature of the main electronic expansion valve 7 reaches the first pour point temperature threshold value, it is considered that the engine lubricating oil is about to condense, and oil blockage is about to occur, the branch electronic expansion is controlled to be in an open state at a preset opening degree, so that the refrigerant flows into the branch exhaust pipe, the heat storage and heat preservation module 10 stores the heat of the refrigerant flowing through the branch exhaust pipe, and transfers the heat to the main electronic expansion valve 7 and the two filters 8 connected to the two ends of the main electronic expansion valve 7, so as to heat the main electronic expansion valve 7 and the two filters 8 connected to the two ends of the main electronic expansion valve 7, thereby effectively preventing and improving the oil blockage phenomenon occurring in the low-temperature heating or defrosting switching heating process of the refrigerant, and improving the reliability and safety of the air conditioner operation. If the post-valve temperature of the main electronic expansion valve 7 does not reach the first pour point temperature threshold value, and it is determined that the engine lubricating oil has condensed, that is, oil blockage has occurred, the branch electronic expansion valve 9 is controlled to perform a first preset action, where the first preset action includes: the branch electronic expansion valve 9 is opened at a preset opening degree, the opening degree is gradually increased according to the preset opening degree increasing amount, and when the temperature behind the main electronic expansion valve 7 reaches a preset second pour point temperature threshold value with higher temperature, the temperature of the engine lubricating oil is considered to be higher, and oil blockage cannot occur, the branch electronic expansion valve 9 is controlled to be closed, so that the refrigerant does not flow into the branch exhaust pipe, the air conditioner normally operates, and the refrigerant only passes through the main exhaust pipe, and therefore the waste of the refrigerant flow is avoided. Therefore, oil blockage prevention protection of low-temperature heating starting of the air conditioner is completed. In a specific embodiment, the preset opening degree increase is, for example, a frequency of M steps per minute, that is, the branch electronic expansion valve 9 is controlled to open at the preset opening degree, and the valve opening degree is continuously increased according to the frequency of M steps per minute until the post-valve temperature of the main electronic expansion valve 7 reaches the second pour point temperature threshold value with a higher preset temperature, and the branch electronic expansion valve 9 is controlled to close.
Specifically, referring to fig. 1 and 2, when the air conditioner 1000 performs heating, a gaseous refrigerant flows out of the compressor 1, passes through the main discharge pipe and the four-way valve 4, flows into the indoor heat exchanger 2, is condensed into a liquid state, flows out of the indoor heat exchanger 2, is throttled by the main electronic expansion valve 7, flows into the outdoor heat exchanger 5, and is evaporated into a gaseous state, thereby completing one cycle. In a non-low-temperature heating working condition (that is, the air conditioner 1000 is in heating operation, and the outdoor environment temperature reaches the environment temperature threshold), the branch electronic expansion valve 911 is in a normally closed state, the refrigerant flows out of the compressor 1 and only passes through the main exhaust pipe, when the post-valve temperature of the main electronic expansion valve 7 is less than or equal to the first pour point temperature threshold, the branch electronic expansion valve 9 is controlled to be opened to a preset opening degree, and part of the refrigerant flows into the branch exhaust pipe, so that the heat storage and preservation module 10 starts to store heat; when the air conditioner is started to heat at a low temperature (namely the air conditioner 1000 is started and operates to heat, and the outdoor environment temperature does not reach the environment temperature threshold value) or when the air conditioner is switched to heat after defrosting, the heat storage and insulation module 10 provides heat for the main electronic expansion valve 7 and the filters 8 at the two ends of the main electronic expansion valve to heat the main electronic expansion valve 7, so that oil blockage of the main electronic expansion valve 7 and the filters 8 at the two ends of the main electronic expansion valve can be effectively prevented when the air conditioner is switched to heat after defrosting, and the reliability and the safety of the operation of the air conditioner are improved. And when the post-valve temperature of the main electronic expansion valve 7 is greater than or equal to the second pour point temperature threshold value, the branch electronic expansion valve 9 is controlled to be closed, and the refrigerant only passes through the main exhaust pipe and does not pass through the branch exhaust pipe, so that the energy waste of the refrigerant is avoided.
In an embodiment of the present invention, after determining that the outdoor ambient temperature has not reached the ambient temperature threshold, the controller 200 is further configured to: judging whether the temperature of the outdoor coil reaches a preset defrosting temperature threshold value or not; if the temperature of the outdoor defrosting temperature coil does not reach the defrosting temperature threshold, the branch electronic expansion valve 9 is controlled to be in an open state at a preset opening degree, and whether the post-valve temperature of the main electronic expansion valve 7 reaches a preset third pour point temperature threshold is further judged; if the post-valve temperature of the main electronic expansion valve 7 reaches the third pour point temperature threshold, controlling the branch electronic expansion to be in an open state at a preset opening degree; if the post-valve temperature of the main electronic expansion valve 7 does not reach the third pour point temperature threshold, controlling the branch electronic expansion valve 9 to execute a second preset action, where the second preset action includes: the by-pass electronic expansion valve 9 is opened at a preset opening degree and gradually increased in opening degree according to a preset opening degree increase amount until the post-valve temperature of the main electronic expansion valve 7 reaches a preset fourth pour point temperature, which is greater than the third pour point temperature, and the by-pass electronic expansion valve 9 is controlled to close.
Specifically, the preset defrosting temperature threshold is a preset temperature value, which is set according to, for example, whether the air conditioner 1000 needs to perform a defrosting operation, when the outdoor coil temperature of the outdoor heat exchanger 5 is determined to be less than or equal to the preset defrosting temperature threshold, the air conditioning system performs a defrosting operation, that is, the air conditioner 1000 performs defrosting, otherwise, the air conditioning system does not perform defrosting. In an embodiment, to ensure the accuracy and reliability of the defrosting judgment of the air conditioner, the defrosting temperature threshold may be set as the sum of the defrosting temperature set by the air conditioner and a second preset temperature margin, where the second preset temperature margin is denoted as η, and the η is in a range of, for example, 0 to 5 ℃.
The third pour point temperature threshold value is a preset temperature value which is set according to, for example, whether the engine lubricating oil reaches the lowest temperature to be condensed or not, and when the post-valve temperature of the main electronic expansion valve 7 is judged to reach the preset third pour point temperature threshold value, the engine lubricating oil is considered to be about to be condensed, and oil blockage is about to occur; when the post-valve temperature of the main electronic expansion valve 7 is judged not to reach the preset third pour point temperature threshold value, the engine lubricating oil is considered to be condensed, namely, oil blockage occurs. In a particular embodiment, the third pre-point temperature threshold value may be equal to the first pour point temperature threshold value.
The fourth pour point temperature is a preset temperature value, and when the post-valve temperature of the main electronic expansion valve 7 is judged to reach the preset fourth pour point temperature threshold value, the temperature of the engine lubricating oil is considered to be high, and oil blockage cannot occur. The fourth pour point temperature is greater than the third pour point temperature. In one embodiment, to ensure the accuracy and reliability of the anti-oil blockage control, the fourth pour point temperature may be the sum of the third pour point temperature and a first predetermined temperature margin, which is designated as λ, where λ ranges from, for example, 0 to 20 ℃. In particular embodiments, the fourth pre-point temperature threshold may be equal to the second pour point temperature threshold.
In a specific embodiment, after determining that the outdoor environment temperature does not reach the environment temperature threshold, further determining whether the outdoor coil temperature reaches a preset defrosting temperature threshold; if the temperature of the outdoor coil of the defrosting temperature does not reach the defrosting temperature threshold, the air conditioner is in a defrosting mode at the moment, namely, the air conditioner is defrosting, the branch electronic expansion valve 9 is controlled to be in an open state at a preset opening degree, so that the refrigerant flows into the branch exhaust pipe, the heat storage and heat preservation module 10 stores the heat of the refrigerant flowing through the branch exhaust pipe, the heat storage and heat preservation module 10 stores the heat in advance, and the main electronic expansion valve 7 and the front and rear filters 8 thereof are heated when the defrosting and defrosting switching heating is performed, so that oil blockage is prevented from occurring, the oil blockage phenomenon occurring in the low-temperature heating or defrosting and switching heating process of the refrigerant is effectively prevented and improved, and the reliability and the safety of the operation of the air conditioner are improved. Further, in the defrosting switching heating process, whether the post-valve temperature of the main electronic expansion valve 7 reaches a preset third pour point temperature threshold value is judged; if the post-valve temperature of the main electronic expansion valve 7 reaches the third pour point temperature threshold, it is determined that the engine lubricating oil is about to condense, i.e., oil blockage is about to occur, the branch electronic expansion is controlled to be in an open state at a preset opening degree, so that the refrigerant flows into the branch exhaust pipe, the heat storage and heat preservation module 10 stores the heat of the refrigerant flowing through the branch exhaust pipe, and transfers the heat to the main electronic expansion valve 7 and the two filters 8 connected to the two ends of the main electronic expansion valve 7, so as to heat the main electronic expansion valve 7 and the two filters 8 connected to the two ends of the main electronic expansion valve 7, thereby effectively preventing and improving the oil blockage phenomenon occurring in the low-temperature heating or defrosting switching heating process of the refrigerant, and improving the reliability and safety of the air conditioner operation. If the post-valve temperature of the main electronic expansion valve 7 does not reach the third pour point temperature threshold value, it is determined that the engine lubricating oil has condensed, i.e. oil blockage has occurred, the control branch electronic expansion valve 9 executes a second preset action, where the second preset action includes: the branch electronic expansion valve 9 is opened at a preset opening degree, the opening degree is gradually increased according to a preset opening degree increase amount, the branch electronic expansion valve 9 is controlled to be closed until the temperature behind the main electronic expansion valve 7 reaches a preset fourth pour point temperature with higher temperature, and if the temperature of engine lubricating oil is higher and oil blockage cannot occur, the branch electronic expansion valve 9 is controlled to be closed, so that the refrigerant does not flow into the branch exhaust pipe, the air conditioner normally operates, and the refrigerant only passes through the main exhaust pipe, so that the waste of the refrigerant flow is avoided. Thereby, accomplish the air conditioner defrosting and the grease proofing stifled protection of defrosting switching heating in-process. In a specific embodiment, the preset opening degree increase is, for example, M steps per minute, that is, the branch electronic expansion valve 9 is controlled to open at the preset opening degree, and the valve opening degree is continuously increased at the frequency of M steps per minute until the post-valve temperature of the main electronic expansion valve 7 reaches the fourth pour point temperature threshold value with a higher preset temperature, and the branch electronic expansion valve 9 is controlled to close. Wherein M is a preset step length.
As a specific embodiment, referring to fig. 1 and fig. 2, specifically, when the air conditioner 1000 is in the defrosting mode, the high-temperature gaseous refrigerant discharged from the compressor 1 enters the outdoor heat exchanger 5 through the four-way valve 4 to be condensed, released, defrosted, enters the indoor heat exchanger 2 through the main electronic expansion valve 7 to be evaporated and absorbed, and finally enters the compressor 1 through the four-way valve 4 to complete the whole cycle. Because the areas near the indoor heat exchanger 2 and the main electronic expansion valve 7 are in a low temperature state due to defrosting, when the air conditioner 1000 is switched from defrosting to heating operation mode again, an oil blocking phenomenon is easily generated near the main electronic expansion valve 7 and the filters 8 at the front and rear ends thereof, so that before defrosting is switched to heating mode, the branch electronic expansion valve 9 is controlled to be opened to a preset opening degree, so as to utilize the branch exhaust pipe to store heat for the heat storage and heat preservation module 10, so that the heat storage and heat preservation module 10 heats the areas near the main electronic expansion valve 7 and the filters 810 at the front and rear ends thereof through heat transfer, and the temperature of the areas is raised to a normal level, such as a fourth preset pour point temperature, thereby effectively preventing and improving the oil blocking phenomenon generated in the refrigerant low-temperature heating or defrosting switching heating process, and improving the reliability and safety of air conditioner operation.
In an embodiment of the invention, the controller 200 is further configured to: when the temperature of the outdoor coil reaches the defrosting temperature threshold value, the branch electronic expansion valve 9 is controlled to be in an open state at a preset opening degree.
Specifically, under a low-temperature working condition, when the temperature of the outdoor coil reaches a defrosting temperature threshold, the air conditioner is not in a defrosting mode, the air conditioner is not defrosted, and at the time, the air conditioner is in a heating operation, the branch electronic expansion valve 9 is controlled to be in an open state at a preset opening degree, so that the refrigerant flows into the branch exhaust pipe, the heat storage and heat preservation module 10 stores the heat of the refrigerant flowing through the branch exhaust pipe, and the heat is transferred to the main electronic expansion valve 7 and the two filters 8 connected to the two ends of the main electronic expansion valve 7, so as to heat the main electronic expansion valve 7 and the two filters 8 connected to the two ends of the main electronic expansion valve 7, thereby effectively preventing and improving the oil blockage phenomenon in the refrigerant low-temperature heating or defrosting switching heating process, and improving the reliability and safety of the air conditioner operation.
In an embodiment of the invention, the controller 200 is further configured to: when the air conditioner 1000 is determined not to be operated for heating, the branch electronic expansion valve 9 is controlled to be in a closed state.
Specifically, under a low-temperature working condition, when the air conditioner is not in heating operation and is not in a defrosting mode at the moment, the lubricating oil of the compressor 1 is considered not to be blocked by oil, the branch electronic expansion valve 9 is controlled to be in a closed state, so that the refrigerant does not flow into the branch exhaust pipe, the air conditioner normally operates, and the refrigerant only passes through the main exhaust pipe, so that the waste of the refrigerant flow is avoided.
Therefore, in the embodiment, when the air conditioner 1000 is started at low temperature for heating and the defrosting operation is switched to the heating operation, and oil blockage occurs in the main electronic expansion valve 7 and the filters 8 at the front and rear ends of the main electronic expansion valve, the exhaust temperature of the compressor 1 is increased, heat caused by the exhaust temperature is stored in the heat storage and heat preservation module 10 by controlling the opening and closing states of the branch electronic expansion valve 9, and the heat storage and heat preservation module 10 melts and prevents the oil blockage occurring in the main electronic expansion valve 7 and the filters 8 at the front and rear ends of the main electronic expansion valve by the heat. In the embodiment of the invention, a path of heat source is separately led out through the design of the branch exhaust pipe, the heat source flows through the heat storage and heat preservation module 10 to store heat, and the main electronic expansion valve 7 wrapped in the period and the filters 8 at the front end and the rear end of the main electronic expansion valve are heated, so that the oil blockage of the main electronic expansion valve 7 and the filters 8 at the front end and the rear end of the main electronic expansion valve are effectively prevented, the problem of the oil blockage of the main electronic expansion valve 7 and the filters 8 at the front end and the rear end of the main electronic expansion valve in the process of low-temperature heating starting and defrosting switching to heating operation of the air conditioner 1000 is thoroughly solved on the premise of not influencing the refrigerating working condition and normal-temperature heating of the air conditioner 1000, and the operation reliability and safety of the air conditioner 1000 are improved.
In one embodiment of the present invention, the heat accumulation and preservation module 10 is disposed at a return bend of the branch exhaust pipe, thereby preventing a liquid return phenomenon from occurring and improving reliability and safety of operation of the air conditioner. Further, the heat accumulating and preserving module 10 may be specifically disposed at the second return bend of the branch exhaust pipe.
In order to better understand the present invention, as a specific embodiment, a specific execution flow of the controller 200 of the air conditioner 1000 according to the embodiment of the present invention during the oil blockage prevention control is described below with reference to fig. 3.
The embodiment of the invention mainly deals with the risk of oil blockage in the low-temperature heating starting and defrosting processes of the air conditioner 1000, when the air conditioner 1000 is started in low-temperature heating, because the main electronic expansion valve 7 and the areas near the filters 8 at the front end and the rear end of the main electronic expansion valve are in a low-temperature state, pressure imbalance is easily generated at the starting moment, the temperature is rapidly reduced, the pressure is unbalanced, the temperature is reduced more rapidly, the oil blockage is serious, and the air conditioning system is in a vicious circle; when the defrosting mode is switched to the heating mode, the influence caused by the vicious circle is more obvious, the oil blockage can enable the exhaust of the compressor 1 to be rapidly increased, finally, the compressor 1 is triggered to exhaust and protect and stop, and irreversible influence is often caused to the compressor 1. Based on this, in the specific embodiment, the working principle of the air conditioner 1000 according to the embodiment of the present invention for realizing the oil blockage prevention control is summarized as follows: the branch electronic expansion valve 9 is controlled to be opened and closed, the branch exhaust pipe is used for heating the heat accumulation and heat preservation module 10 to accumulate heat, and the heat accumulation and heat preservation module 10 is used for heating the main electronic expansion valve 7 and the filters 8 at the front end and the rear end of the main electronic expansion valve, so that the risk of oil blockage of the air conditioner 1000 in the low-temperature heating starting and defrosting process is avoided.
In an embodiment, a specific execution flow of the controller 200 of the air conditioner 1000 during the oil blockage prevention control will be described with reference to fig. 3. First, the relevant parameters are introduced, and the preset pour point temperature after the lubricating oil valve is T Pour point It can be determined experimentally; post-valve temperature T of main electronic expansion valve 7 After the valve (ii) a The outdoor ambient temperature detected by the outdoor ambient temperature sensor 3 is T Outer ring ，T Outer ring For example, 7 ℃; lambda is the temperature allowance and the value range is 0-20 ℃; eta is the temperature allowance and the value range is 0-5 ℃; the outdoor coil temperature detected by the outdoor coil temperature sensor 6 is T External coiled pipe (ii) a The air conditioner 1000 sets the defrosting setting temperature T Defrost setting When T is External coiled pipe ≤T Defrost setting At this time, the air conditioner 1000 performs a defrosting operation.
Referring to fig. 3, in the embodiment, during the oil blockage prevention control of the air conditioner 1000, the controller 200 mainly performs the following steps S101 to S117. The steps S101 to S108 are corresponding processes when the air conditioner starts to perform low-temperature heating, and the steps S109 to S117 are corresponding processes when the air conditioner performs defrosting operation and switches to heating operation.
Step S101: the air conditioner 1000 is turned on to determine whether the mode is the heating mode, and if the mode is the heating mode, the process goes to step S103, and if the mode is not the heating mode, the process goes to step S102.
Step S102: if the air conditioner 1000 is in the heating mode, the outdoor ambient temperature T is further determined Outer ring If not, the step S104 is executed, otherwise, the step S103 is executed.
Step S103: the air conditioner 1000 operates in a non-heating mode or at an external ambient temperature T Outer ring And if the temperature is higher than 7 ℃, controlling the branch electronic expansion valve 9 to be in a closed state.
Step S104: the air conditioner 1000 operates in a heating mode and determines an outdoor ambient temperature T Outer ring If the temperature is less than or equal to 7 ℃, the branch electronic expansion valve 9 is controlled to be in an initial opening state, namely, the branch electronic expansion valve is opened at a preset opening, and the valve of the main electronic expansion valve 7 is further judgedRear temperature T Post-valve temperature Whether or not less than the pour point temperature T of the lubricating oil Pour point If yes, go to step S106, otherwise go to step S105..
Step S105: if post-valve temperature T Post-valve temperature Above the pour point temperature T Pour point Then the branch electronic expansion valve 9 is controlled to be in the initial opening state.
Step S106: if post-valve temperature T Post-valve temperature Below the pour point temperature T Pour point Then, the branch electronic expansion valve 9 is controlled to be in the initial opening state, and the branch electronic expansion valve is opened at a frequency of M steps per minute, and the process goes to step S107.
Step S107: judging the post-valve temperature T of the main electronic expansion valve 7 Post-valve temperature Whether or not T is greater than or equal to Pour point + λ (λ is temperature margin and its value range is 0-20 ℃), if yes, execute step S108, otherwise, return to step S106.
Step S108: when the post-valve temperature T of the main electronic expansion valve 7 Post-valve temperature Greater than or equal to T Pour point And + lambda, the branch electronic expansion valve 9 is closed at this time, and oil blockage prevention protection is completed when the air conditioner 1000 is started for low-temperature heating.
Step S109: whether the air conditioner 1000 is in heating operation is determined, if so, the process goes to step S110, otherwise, the process goes to step S111.
Step S110: judging outdoor environment temperature T Outer ring And if the temperature is lower than 7 ℃, executing the step S112, otherwise, jumping to the step S111.
Step S111: if the air conditioner 1000 is not in heating operation or the outdoor ambient temperature T Outer ring And if the temperature is higher than 7 ℃, the branch electronic expansion valve 9 is controlled to be in a closed state.
Step S112: if the outdoor ambient temperature T Outer ring If the temperature is lower than 7 ℃, the temperature T of the outdoor coil pipe is continuously detected External coil pipe Judgment of T External coil pipe Whether or not it is lower than the defrosting set temperature T Defrost setting + η (η is the temperature margin and the value range is 0-5 ℃), if yes, executing step S114, otherwise, going to step S113.
Step S113: if T External coiled pipe Whether or not it is higher than the defrosting set temperatureT Defrost setting + η, the branch electronic expansion valve 9 is controlled to be in the initial opening state, i.e. opened by the preset opening.
Step S114: if T External coiled pipe Whether or not less than or equal to the defrosting set temperature T Defrost setting + η, the branch electronic expansion valve 9 is controlled to be opened to the initial opening degree to perform advanced heat storage on the heat storage and heat preservation module 10, and the branch electronic expansion valve 7 and the front and rear filters 8 are heated when defrosting and defrosting switching heating is performed, so that oil blockage is prevented. Detecting the post-valve temperature T of the main electronic expansion valve 7 during defrosting switching heating Post-valve temperature Whether or not it is less than or equal to the pour point temperature T of the lubricating oil Pour point If yes, step S115 is executed, that is, the branch electronic expansion valve 9 is controlled to be in the initial opening state, otherwise, step S113 is returned to.
Step S115: if post-valve temperature T Post-valve temperature Below the pour point temperature T Pour point Then, the branch electronic expansion valve 9 is controlled to be in the initial opening state, and the branch electronic expansion valve is opened continuously at a frequency of M steps per minute, and the process goes to step S116.
Step S116: judging the post-valve temperature T of the main electronic expansion valve 7 Post-valve temperature Whether or not T is greater than or equal to Pour point + λ (λ is temperature margin, and its value range is 0-20 ℃), if yes, execute step S117, otherwise, return to step S115.
Step S117: when the post-valve temperature T of the main electronic expansion valve 7 Post-valve temperature Greater than or equal to T Pour point And + lambda, the branch electronic expansion valve 9 is closed at this time, and oil blockage prevention protection is completed when the air conditioner 1000 is started for low-temperature heating.
According to the air conditioner 1000 of the embodiment of the invention, a branch exhaust pipe of an exhaust pipe of the compressor 1 and the heat storage and heat preservation module 10 positioned on the branch exhaust pipe are designed, and a heat source is led out separately to heat the heat storage and heat preservation module 10, when the main electronic expansion valve 7 and the filters 8 in front of and behind the main electronic expansion valve 7 are blocked by oil in the processes of low-temperature heating starting and defrosting switching of the air conditioner 1000, the exhaust temperature of the compressor 1 is increased, the heat brought by the exhaust temperature is stored in the heat storage and heat preservation module 10 through controlling the branch electronic expansion valve 9 on the branch exhaust pipe, and then the heat is transferred to the main electronic expansion valve 7 and the filters 8 in front of and behind the main electronic expansion valve 7, so that the oil blockage of the main electronic expansion valve 7 and the filters 8 in front of and behind the main electronic expansion valve is melted and prevented. That is, the air conditioner 1000 balances the problem of oil blockage behind the main electronic expansion valve 7 in the low-temperature heating starting and defrosting processes by using the exhaust temperature, corrects the oil blockage degree by using the principle that the exhaust temperature is higher when the oil blockage is more serious, and pre-prevents adverse effects caused by the oil blockage, opens the branch electronic expansion valve 9 on the branch exhaust pipe in the low-temperature heating starting and defrosting switching processes, and allows part of high-temperature refrigerant in the exhaust pipe to enter the branch exhaust pipe, which is close to the main electronic expansion valve 7 on the main flow path and is externally coated with the heat storage and insulation module 10 to prevent heat loss, and transfers heat to the main electronic expansion valve 7 to heat the heat storage and insulation module 10 after heating the heat storage and insulation module 10 by using the high-temperature refrigerant in the branch exhaust pipe, so as to effectively prevent and improve the oil blockage phenomenon in the low-temperature heating or defrosting switching heating processes, thereby improving the reliability and safety of the air conditioner operation; meanwhile, the air conditioner 1000 has a simple structure, fewer design parts, low cost and high reliability.
The embodiment of the invention also provides an oil blockage prevention control method of the air conditioner. Hereinafter, an oil blockage prevention control method for an air conditioner according to an embodiment of the present invention will be described with reference to fig. 4 to 7, for example, the air conditioner described in any of the above embodiments of the present invention, and thus, with respect to a specific composition structure, a connection relationship, and the like of the air conditioner, reference may be made to the air conditioner described in any of the above embodiments, that is, the air conditioner includes: the system comprises a refrigeration system, a heat storage and insulation module, an outdoor environment temperature sensor, a temperature sensor behind a valve, an outdoor coil pipe temperature sensor and a controller, wherein the refrigeration system comprises a refrigeration cycle loop.
The refrigerating system is used for exchanging the positions of the air suction and exhaust pipes in the refrigerating circulation loop so as to heat indoor air by utilizing the evaporator to realize the heating operation of the air conditioner, and comprises a compressor which is used for compressing low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharging the high-temperature and high-pressure refrigerant gas to the condenser.
The refrigeration cycle loop is used for enabling a refrigerant to circulate in a loop consisting of the compressor, the indoor heat exchanger, the four-way valve, the outdoor heat exchanger and the main electronic expansion valve, wherein two ends of the main electronic expansion valve are respectively connected with a filter.
The exhaust end of the compressor is connected with one end of the four-way valve through an exhaust pipeline, the exhaust pipeline comprises a main exhaust pipe and a branch exhaust pipe which are connected in parallel, the branch exhaust pipe is arranged close to the main electronic expansion valve, one end of the branch exhaust pipe close to the compressor is provided with a branch electronic expansion valve, and two ends of the branch electronic expansion valve are respectively connected with a filter.
The heat storage and preservation module is arranged on the branch exhaust pipe and wraps the main electronic expansion valve and the two filters connected to the two ends of the main electronic expansion valve.
The outdoor environment temperature sensor is used for detecting the outdoor environment temperature.
The post-valve temperature sensor is arranged at one end of the main electronic expansion valve close to the compressor and used for detecting the post-valve temperature of the main electronic expansion valve.
The outdoor coil temperature sensor is arranged on the outdoor heat exchanger and used for detecting the temperature of the outdoor coil.
Fig. 4 is a method for controlling oil clogging of an air conditioner according to an embodiment of the present invention. As shown in fig. 4, the method for controlling oil blockage prevention of an air conditioner includes the following steps:
step S1: the operation state of the air conditioner, the outdoor ambient temperature, the post-valve temperature at the rear end of a main electronic expansion valve in a refrigeration cycle loop and the outdoor coil temperature of an outdoor heat exchanger are obtained.
Step S2: according to the running state of the air conditioner, the opening or closing of branch electronic expansion in a refrigeration cycle loop is controlled by combining the outdoor environment temperature, the post-valve temperature and the outdoor coil pipe temperature, so that when the branch electronic expansion valve is in the opening state, the heat storage and heat preservation module stores the heat of the refrigerant flowing through the branch exhaust pipe and transmits the heat to the main electronic expansion valve and the two filters connected to the two ends of the main electronic expansion valve, the main electronic expansion valve and the two filters connected to the two ends of the main electronic expansion valve are heated, and therefore the oil blockage phenomenon in the low-temperature heating or defrosting switching heating process of the refrigerant is effectively prevented and improved, and the running reliability and safety of the air conditioner are improved. The branch exhaust pipe is arranged close to the main electronic expansion valve, and the heat storage and insulation module is arranged on the branch exhaust pipe and wraps the main electronic expansion valve and the two filters connected to the two ends of the main electronic expansion valve.
In an embodiment of the present invention, as shown in fig. 5, the step S2 of controlling the opening or closing of the branch electronic expansion in the refrigeration cycle circuit according to the operation state of the air conditioner by combining the outdoor ambient temperature, the post-valve temperature and the outdoor coil temperature includes:
step S21: and when the air conditioner is determined to be started and is operated for heating, judging whether the outdoor environment temperature reaches a preset environment temperature threshold value.
Step S22: and if the outdoor environment temperature does not reach the environment temperature threshold value, controlling the branch electronic expansion valve to be in an opening state at a preset opening degree.
Step S23: and if the outdoor environment temperature reaches the environment temperature threshold value, controlling the branch electronic expansion valve to close.
Specifically, the preset ambient temperature threshold is a preset temperature value, which is set according to, for example, whether the outdoor ambient temperature is low or not, when the outdoor ambient temperature reaches the preset ambient temperature threshold, it is determined that the outdoor ambient is not the low-temperature operating condition, and when the outdoor ambient temperature does not reach the preset ambient temperature threshold, it is determined that the outdoor ambient is the low-temperature operating condition. In a specific embodiment, the preset threshold value of the environmental temperature is, for example, 7 ℃, that is, when the outdoor environmental temperature reaches 7 ℃, the outdoor environment is considered not to be the low-temperature working condition, and when the outdoor environmental temperature does not reach 7 ℃, the outdoor environment is considered to be the low-temperature working condition.
Specifically, when the air conditioner is determined to be started and heated, and the outdoor environment temperature does not reach a preset environment temperature threshold value, if the temperature is 7 ℃, the environment temperature is considered to be higher, namely the air conditioner is in a low-temperature heating starting working condition, and oil blockage is easy to occur, the branch electronic expansion valve is controlled to be in an open state at a preset opening degree, so that the refrigerant flows into the branch exhaust pipe, the heat storage and heat preservation module stores the heat of the refrigerant flowing through the branch exhaust pipe, the heat is transferred to the main electronic expansion valve and the two filters connected to the two ends of the main electronic expansion valve, the main electronic expansion valve and the two filters connected to the two ends of the main electronic expansion valve are heated, and therefore the oil blockage phenomenon occurring in the low-temperature heating or defrosting switching heating process of the refrigerant is effectively prevented and improved, and the reliability and the safety of the air conditioner are improved. If the air conditioner is determined to be started and heated, and the outdoor environment temperature reaches the preset environment temperature threshold value, if the temperature is 7 ℃, the environment temperature is considered to be higher, namely the air conditioner is not in the low-temperature heating starting working condition, and oil blockage is not easy to occur, the branch electronic expansion valve is controlled to be in the closed state, so that the refrigerant does not flow into the branch exhaust pipe, the air conditioner normally operates, and the refrigerant only passes through the main exhaust pipe, so that the waste of the refrigerant flow is avoided.
In an embodiment of the present invention, as shown in fig. 6, after determining that the outdoor ambient temperature does not reach the ambient temperature threshold in step S2, the method further includes:
step S24: and judging whether the post-valve temperature of the main electronic expansion valve reaches a preset first pour point temperature threshold value.
Step S25: and if the post-valve temperature of the main electronic expansion valve reaches a first pour point temperature threshold value, controlling the branch electronic expansion to be in an open state by a preset opening degree.
Step S26: if the post-valve temperature of the main electronic expansion valve does not reach the first pour point temperature threshold, controlling the branch electronic expansion valve to execute a first preset action, wherein the first preset action comprises the following steps: and the branch electronic expansion valve is opened at a preset opening degree, the opening degree is gradually increased according to the increment of the preset opening degree, and the branch electronic expansion valve is controlled to be closed until the post-valve temperature of the main electronic expansion valve reaches a preset second pour point temperature threshold value, wherein the second pour point temperature threshold value is larger than the first pour point temperature threshold value.
Specifically, the first pour point temperature threshold value is a preset temperature value which is set according to, for example, whether the engine lubricating oil reaches the lowest temperature at which the engine lubricating oil is about to be condensed or not, and when the post-valve temperature of the main electronic expansion valve is judged to reach the preset first pour point temperature threshold value, the engine lubricating oil is considered to be about to be condensed, and oil blockage is about to occur; and when the post-valve temperature of the main electronic expansion valve is judged not to reach the preset first pour point temperature threshold value, the engine lubricating oil is considered to be condensed, namely, oil blockage occurs.
The second pour point temperature is a preset temperature value, and when the temperature after the valve of the main electronic expansion valve reaches the preset second pour point temperature threshold value, the temperature of the engine lubricating oil is considered to be higher, and oil blockage cannot occur. The second pour point temperature is greater than the first pour point temperature. In one embodiment, to ensure the accuracy and reliability of the anti-oil blockage control, the second pour point temperature may be set to be the sum of the first pour point temperature and a first predetermined temperature margin, where the first predetermined temperature margin is denoted as λ, and λ is, for example, in a range of 0-20 ℃.
Specifically, after determining that the outdoor ambient temperature does not reach the ambient temperature threshold value, further determining whether the post-valve temperature of the main electronic expansion valve reaches a preset first pour point temperature threshold value; if the post-valve temperature of the main electronic expansion valve reaches a first pour point temperature threshold value, engine lubricating oil is considered to be condensed, and oil blockage is about to occur, the branch electronic expansion is controlled to be in an open state at a preset opening degree, so that the refrigerant flows into the branch exhaust pipe, the heat storage and heat preservation module stores the heat of the refrigerant flowing through the branch exhaust pipe and transfers the heat to the main electronic expansion valve and the two filters connected to the two ends of the main electronic expansion valve, the main electronic expansion valve and the two filters connected to the two ends of the main electronic expansion valve are heated, and therefore the oil blockage phenomenon occurring in the low-temperature heating or defrosting switching heating process of the refrigerant is effectively prevented and improved, and the reliability and safety of the operation of the air conditioner are improved. If the post-valve temperature of the main electronic expansion valve does not reach the first pour point temperature threshold value, the engine lubricating oil is considered to be condensed, namely oil blockage occurs, the branch electronic expansion valve is controlled to execute a first preset action, and the first preset action comprises the following steps: the branch electronic expansion valve is opened at a preset opening degree, the opening degree is gradually increased according to a preset opening degree increasing amount, and the branch electronic expansion valve is controlled to be closed until the temperature behind the main electronic expansion valve reaches a second pour point temperature threshold value with higher preset temperature, the temperature of engine lubricating oil is considered to be higher, oil blockage cannot occur, so that the refrigerant does not flow into the branch exhaust pipe, the air conditioner normally operates, and the refrigerant only passes through the main exhaust pipe, and therefore the waste of the refrigerant flow is avoided. Therefore, oil blockage prevention protection of low-temperature heating starting of the air conditioner is completed. In a specific embodiment, the preset opening degree increase is, for example, a frequency of M steps per minute, that is, the branch electronic expansion valve is controlled to open at the preset opening degree, and the valve opening degree is continuously increased according to the frequency of M steps per minute until the post-valve temperature of the main electronic expansion valve reaches the preset higher-temperature second pour point temperature threshold, the branch electronic expansion valve is controlled to close.
In an embodiment of the present invention, as shown in fig. 7, after determining that the outdoor ambient temperature does not reach the ambient temperature threshold in step S2, the method further includes:
step S27: and judging whether the temperature of the outdoor coil reaches a preset defrosting temperature threshold value or not.
Step S28: if the temperature of the outdoor coil does not reach the defrosting temperature threshold value, the branch electronic expansion valve is controlled to be in an opening state by a preset opening degree, and whether the post-valve temperature of the main electronic expansion valve reaches a preset third pour point temperature threshold value is further judged.
Step S29: and if the post-valve temperature of the main electronic expansion valve reaches a third pour point temperature threshold value, controlling the branch electronic expansion to be in an opening state by a preset opening degree.
Step S30: if the post-valve temperature of the main electronic expansion valve does not reach the third pour point temperature threshold value, controlling the branch electronic expansion valve to execute a second preset action, wherein the second preset action comprises the following steps: and the branch electronic expansion valve is opened at a preset opening degree, the opening degree is gradually increased according to the increment of the preset opening degree, and the branch electronic expansion valve is controlled to be closed until the post-valve temperature of the main electronic expansion valve reaches a preset fourth pour point temperature, wherein the fourth pour point temperature is higher than the third pour point temperature.
Specifically, the preset defrosting temperature threshold is a preset temperature value, which is set according to, for example, whether the air conditioner needs to perform a defrosting operation or not, when the temperature of the outdoor coil of the outdoor heat exchanger is judged to be less than or equal to the preset defrosting temperature threshold, the air conditioning system performs a defrosting operation, that is, the air conditioner performs defrosting, otherwise, the air conditioning system does not perform defrosting. In an embodiment, to ensure the accuracy and reliability of the defrosting judgment of the air conditioner, the defrosting temperature threshold may be set as the sum of the defrosting temperature set by the air conditioner and a second preset temperature margin, where the second preset temperature margin is denoted as η, and the η is in a range of, for example, 0 to 5 ℃.
The third pour point temperature threshold is a preset temperature value, which is set according to, for example, whether the engine lubricating oil reaches the lowest temperature at which the engine lubricating oil is about to be condensed or not, and when the post-valve temperature of the main electronic expansion valve is judged to reach the preset third pour point temperature threshold, the engine lubricating oil is considered to be about to be condensed, that is, oil blockage is about to occur; and when the post-valve temperature of the main electronic expansion valve is judged not to reach the preset third pour point temperature threshold value, the engine lubricating oil is considered to be condensed, namely, the oil blockage occurs. In particular embodiments, the third pre-point temperature threshold may be equal to the first pour point temperature threshold.
The fourth pour point temperature is a preset temperature value, and when the post-valve temperature of the main electronic expansion valve is judged to reach the preset fourth pour point temperature threshold value, the temperature of the engine lubricating oil is considered to be high, and oil blockage cannot occur. The fourth pour point temperature is greater than the third pour point temperature. In one embodiment, to ensure the accuracy and reliability of the oil blockage control, the fourth pour point temperature may be the sum of the third pour point temperature and a first predetermined temperature margin, which may be referred to as λ, where λ is, for example, in the range of 0-20 ℃. In particular embodiments, the fourth pre-point temperature threshold may be equal to the second pour point temperature threshold.
In a specific embodiment, after determining that the outdoor environment temperature does not reach the environment temperature threshold, further determining whether the outdoor coil temperature reaches a preset defrosting temperature threshold; if the temperature of the outdoor coil pipe of the defrosting temperature does not reach the defrosting temperature threshold value, the air conditioner is in a defrosting mode at the moment, namely, the air conditioner is defrosting, the branch electronic expansion valve is controlled to be in an opening state at a preset opening degree, so that the refrigerant flows into the branch exhaust pipe, the heat storage and heat preservation module stores the heat of the refrigerant flowing through the branch exhaust pipe, the heat storage and heat preservation module stores heat in advance, and the main electronic expansion valve and the front and rear filters of the main electronic expansion valve are heated when the defrosting and defrosting switching heating is performed, so that oil blockage is prevented from occurring, the oil blockage phenomenon occurring in the low-temperature heating or defrosting switching heating process of the refrigerant is effectively prevented and improved, and the reliability and the safety of the operation of the air conditioner are improved. Further, in the defrosting, switching and heating process, judging whether the post-valve temperature of the main electronic expansion valve reaches a preset third pour point temperature threshold value; if the post-valve temperature of the main electronic expansion valve reaches a third pour point temperature threshold value, engine lubricating oil is considered to be condensed, and oil blockage is about to occur, the branch electronic expansion is controlled to be in an open state at a preset opening degree, so that the refrigerant flows into the branch exhaust pipe, the heat storage and heat preservation module stores the heat of the refrigerant flowing through the branch exhaust pipe and transfers the heat to the main electronic expansion valve and the two filters connected to the two ends of the main electronic expansion valve, the main electronic expansion valve and the two filters connected to the two ends of the main electronic expansion valve are heated, and therefore the oil blockage phenomenon occurring in the low-temperature heating or defrosting switching heating process of the refrigerant is effectively prevented and improved, and the reliability and safety of the operation of the air conditioner are improved. If the post-valve temperature of the main electronic expansion valve does not reach the third pour point temperature threshold value, the engine lubricating oil is considered to be condensed, namely oil blockage occurs, the branch electronic expansion valve is controlled to execute a second preset action, and the second preset action comprises the following steps: the branch electronic expansion valve is opened at a preset opening degree, the opening degree is gradually increased according to a preset opening degree increasing amount, the branch electronic expansion valve is controlled to be closed until the temperature behind the main electronic expansion valve reaches a fourth pour point temperature with a higher preset temperature, and if the temperature of engine lubricating oil is higher and oil blockage cannot occur, the branch electronic expansion valve is controlled to be closed, so that the refrigerant does not flow into the branch exhaust pipe, the air conditioner normally operates, and the refrigerant only passes through the main exhaust pipe, so that the waste of the refrigerant flow is avoided. Therefore, the oil blockage prevention protection in the air conditioner defrosting and defrosting switching heating process is completed. In a specific embodiment, the preset opening degree increase is, for example, a frequency of M steps per minute, that is, the branch electronic expansion valve is controlled to be opened at the preset opening degree, and the valve opening degree is continuously increased according to the frequency of M steps per minute until the post-valve temperature of the main electronic expansion valve reaches a preset fourth pour point temperature threshold value with a higher temperature, and the branch electronic expansion valve is controlled to be closed. Wherein M is a preset step length.
In an embodiment of the present invention, the method for controlling oil blockage of an air conditioner further includes: when the temperature of the outdoor coil reaches the defrosting temperature threshold value, the branch electronic expansion valve is controlled to be in an opening state at a preset opening degree.
Specifically, under a low-temperature working condition, when the temperature of the outdoor coil reaches a defrosting temperature threshold value, the air conditioner is not in a defrosting mode, the air conditioner is not defrosted, and at the moment, the air conditioner is in heating operation, the branch electronic expansion valve is controlled to be in an open state at a preset opening degree, so that the refrigerant flows into the branch exhaust pipe, the heat storage and heat preservation module stores the heat of the refrigerant flowing through the branch exhaust pipe and transfers the heat to the main electronic expansion valve and the two filters connected to the two ends of the main electronic expansion valve, the main electronic expansion valve and the two filters connected to the two ends of the main electronic expansion valve are heated, and therefore the oil blockage phenomenon generated in the low-temperature heating or defrosting switching heating process of the refrigerant is effectively prevented and improved, and the reliability and the safety of the operation of the air conditioner are improved.
In an embodiment of the present invention, the method for controlling oil blockage of an air conditioner further includes: and when the condition that the air conditioner does not operate in a heating mode is determined, controlling the branch electronic expansion valve to be in a closed state.
Specifically, under a low-temperature working condition, when the air conditioner is not in heating operation and is not in a defrosting mode at the moment, the lubricating oil of the compressor is not blocked, the branch electronic expansion valve is controlled to be in a closed state, so that the refrigerant does not flow into the branch exhaust pipe, the air conditioner normally operates, and the refrigerant only passes through the main exhaust pipe, so that the waste of the refrigerant flow is avoided.
In one embodiment of the invention, the heat storage and preservation module is arranged at the return bend of the branch exhaust pipe, thereby preventing the liquid return phenomenon and improving the reliability and the safety of the operation of the air conditioner. Further, the heat storage and preservation module may be specifically disposed at the second return bend of the branch exhaust pipe.
It should be noted that, when the method for controlling oil blockage of an air conditioner according to the above embodiment of the present invention performs oil blockage prevention control, a specific implementation manner of the method is similar to that of the air conditioner according to any of the above embodiments of the present invention, and therefore, for a specific implementation process of the method for controlling oil blockage prevention of an air conditioner, reference may be made to the foregoing description about the air conditioner, and details are not repeated herein to reduce redundancy.
According to the oil blockage prevention control method of the air conditioner, a branch exhaust pipe of an exhaust pipeline of the compressor and a heat storage and heat preservation module positioned on the branch exhaust pipe are designed, and a heat source is led out to heat the heat storage and heat preservation module. The method comprises the steps of utilizing exhaust temperature to balance the problem of oil blockage behind a main electronic expansion valve in the low-temperature heating starting and defrosting processes, utilizing the principle that the exhaust temperature is higher when the oil blockage is serious, correcting the oil blockage degree, and preventing adverse effects caused by the oil blockage.
In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (11)
1. An air conditioner, comprising:
the refrigeration system is used for exchanging the positions of the air suction and exhaust pipes in the refrigeration circulation loop so as to heat indoor air by using the evaporator to realize the heating operation of the air conditioner, and comprises a compressor, wherein the compressor is used for compressing low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharging the high-temperature and high-pressure refrigerant gas to a condenser;
the refrigeration cycle loop is used for enabling a refrigerant to circulate in a loop consisting of the compressor, the indoor heat exchanger, the four-way valve, the outdoor heat exchanger and the main electronic expansion valve, wherein two ends of the main electronic expansion valve are respectively connected with a filter;
the exhaust end of the compressor is connected with one end of the four-way valve through an exhaust pipeline, the exhaust pipeline comprises a main exhaust pipe and a branch exhaust pipe which are connected in parallel, the branch exhaust pipe is arranged close to the main electronic expansion valve, one end of the branch exhaust pipe close to the compressor is provided with a branch electronic expansion valve, and two ends of the branch electronic expansion valve are respectively connected with a filter;
the heat storage and insulation module is arranged on the branch exhaust pipe and wraps the main electronic expansion valve and the two filters connected to the two ends of the main electronic expansion valve;
an outdoor ambient temperature sensor for detecting an outdoor ambient temperature;
the temperature sensor behind the valve is arranged at one end of the main electronic expansion valve close to the compressor and used for detecting the temperature behind the valve of the main electronic expansion valve;
the outdoor coil temperature sensor is arranged on the outdoor heat exchanger and used for detecting the temperature of the outdoor coil;
a controller configured to:
the method comprises the steps of obtaining the running state of the air conditioner, controlling the opening or closing of branch electronic expansion by combining the outdoor environment temperature, the post-valve temperature and the outdoor coil pipe temperature according to the running state of the air conditioner, enabling the heat storage and heat preservation module to store the heat of a refrigerant flowing through the branch exhaust pipe when the branch electronic expansion valve is in the opening state, and transferring the heat to the main electronic expansion valve and the two filters connected to the two ends of the main electronic expansion valve so as to heat the main electronic expansion valve and the two filters connected to the two ends of the main electronic expansion valve.
2. The air conditioner according to claim 1, wherein the control device is configured to:
determining whether the outdoor environment temperature reaches a preset environment temperature threshold value when the air conditioner is started and performs heating operation;
if the outdoor environment temperature does not reach the environment temperature threshold value, controlling the branch electronic expansion valve to be in an opening state at a preset opening degree;
and if the outdoor environment temperature reaches the environment temperature threshold value, controlling the branch electronic expansion valve to be closed.
3. The air conditioner of claim 2, wherein after determining that the outdoor ambient temperature has not reached the ambient temperature threshold, the controller is further configured to:
judging whether the post-valve temperature of the main electronic expansion valve reaches a preset first pour point temperature threshold value or not;
if the post-valve temperature of the main electronic expansion valve reaches the first pour point temperature threshold value, controlling the branch electronic expansion to be in an open state by the preset opening degree;
if the post-valve temperature of the main electronic expansion valve does not reach the first pour point temperature threshold value, controlling the branch electronic expansion valve to execute a first preset action, wherein the first preset action comprises the following steps: and the branch electronic expansion valve is opened at the preset opening degree, the opening degree is gradually increased according to the increment of the preset opening degree, and the branch electronic expansion valve is controlled to be closed until the post-valve temperature of the main electronic expansion valve reaches a preset second pour point temperature threshold value, wherein the second pour point temperature threshold value is larger than the first pour point temperature threshold value.
4. The air conditioner of claim 2, wherein after determining that the outdoor ambient temperature has not reached the ambient temperature threshold, the controller is further configured to:
judging whether the temperature of the outdoor coil reaches a preset defrosting temperature threshold value or not;
if the temperature of the outdoor coil of the defrosting temperature does not reach the defrosting temperature threshold, controlling the branch electronic expansion valve to be in an opening state by a preset opening degree, and further judging whether the post-valve temperature of the main electronic expansion valve reaches a preset third pour point temperature threshold;
if the post-valve temperature of the main electronic expansion valve reaches the third pour point temperature threshold, controlling the branch electronic expansion valve to be in an open state at the preset opening degree;
if the post-valve temperature of the main electronic expansion valve does not reach the third pour point temperature threshold value, controlling the branch electronic expansion valve to execute a second preset action, wherein the second preset action comprises the following steps: and the branch electronic expansion valve is opened at the preset opening degree, the opening degree is gradually increased according to the increment of the preset opening degree, and the branch electronic expansion valve is controlled to be closed until the post-valve temperature of the main electronic expansion valve reaches a preset fourth pour point temperature, wherein the fourth pour point temperature is higher than the third pour point temperature.
5. The air conditioner of claim 4, wherein the controller is further configured to:
and when the temperature of the outdoor coil reaches the defrosting temperature threshold value, controlling the branch electronic expansion valve to be in an opening state at a preset opening degree.
6. The air conditioner of claim 2, wherein the controller is further configured to:
and controlling the branch electronic expansion valve to be in a closed state when the air conditioner is determined to be not in heating operation.
7. The air conditioner according to claim 1, wherein the heat accumulation and preservation module is provided at a return of the branch exhaust pipe.
8. An oil blockage prevention control method of an air conditioner is characterized by comprising the following steps:
acquiring the running state of the air conditioner, the outdoor environment temperature, the temperature behind a valve at the rear end of a main electronic expansion valve in a refrigeration cycle loop and the temperature of an outdoor coil of an outdoor heat exchanger;
according to the running state of the air conditioner, the opening or closing of branch electronic expansion in the refrigeration cycle loop is controlled by combining the outdoor environment temperature, the post-valve temperature and the outdoor coil pipe temperature, so that when the branch electronic expansion valve is in an opening state, a heat storage and heat preservation module stores heat of a refrigerant flowing through a branch exhaust pipe and transmits the heat to the main electronic expansion valve and two filters connected to two ends of the main electronic expansion valve so as to heat the main electronic expansion valve and the two filters connected to two ends of the main electronic expansion valve, wherein the branch exhaust pipe is arranged close to the main electronic expansion valve, and the heat storage and heat preservation module is arranged on the branch exhaust pipe and wraps the main electronic expansion valve and the two filters connected to two ends of the main electronic expansion valve.
9. The method for controlling oil blockage prevention of an air conditioner according to claim 8, wherein the step of controlling the opening or closing of the electronic expansion of the branch in the refrigeration cycle circuit according to the operating state of the air conditioner by combining the outdoor environment temperature, the post-valve temperature and the outdoor coil temperature comprises:
determining whether the outdoor environment temperature reaches a preset environment temperature threshold value when the air conditioner is started and performs heating operation;
if the outdoor environment temperature does not reach the environment temperature threshold value, controlling the branch electronic expansion valve to be in an opening state at a preset opening degree;
and if the outdoor environment temperature reaches the environment temperature threshold value, controlling the branch electronic expansion valve to close.
10. The method of claim 9, further comprising, after determining that the outdoor ambient temperature does not reach the ambient temperature threshold value:
judging whether the post-valve temperature of the main electronic expansion valve reaches a preset first pour point temperature threshold value or not;
if the post-valve temperature of the main electronic expansion valve reaches the first pour point temperature threshold value, controlling the branch electronic expansion to be in an open state by the preset opening degree;
if the post-valve temperature of the main electronic expansion valve does not reach the first pour point temperature threshold, controlling the branch electronic expansion valve to execute a first preset action, wherein the first preset action comprises the following steps: and the branch electronic expansion valve is opened at the preset opening degree, the opening degree is gradually increased according to the increment of the preset opening degree, and the branch electronic expansion valve is controlled to be closed until the post-valve temperature of the main electronic expansion valve reaches a preset second pour point temperature threshold value, wherein the second pour point temperature threshold value is larger than the first pour point temperature threshold value.
11. The method of claim 9, further comprising, after determining that the outdoor ambient temperature does not reach the ambient temperature threshold:
judging whether the temperature of the outdoor coil reaches a preset defrosting temperature threshold value or not;
if the temperature of the outdoor coil pipe does not reach the defrosting temperature threshold value, controlling the branch electronic expansion valve to be in an opening state by a preset opening degree, and further judging whether the post-valve temperature of the main electronic expansion valve reaches a preset third pour point temperature threshold value;
if the post-valve temperature of the main electronic expansion valve reaches the third pour point temperature threshold value, controlling the branch electronic expansion to be in an open state by the preset opening degree;
if the post-valve temperature of the main electronic expansion valve does not reach the third pour point temperature threshold, controlling the branch electronic expansion valve to execute a second preset action, wherein the second preset action comprises: and the branch electronic expansion valve is opened at the preset opening degree, the opening degree is gradually increased according to the increment of the preset opening degree, and the branch electronic expansion valve is controlled to be closed until the post-valve temperature of the main electronic expansion valve reaches a preset fourth pour point temperature, wherein the fourth pour point temperature is higher than the third pour point temperature.
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