CN115164458B - Air conditioner and oil blocking prevention control method thereof - Google Patents
Air conditioner and oil blocking prevention control method thereof Download PDFInfo
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- CN115164458B CN115164458B CN202210885025.9A CN202210885025A CN115164458B CN 115164458 B CN115164458 B CN 115164458B CN 202210885025 A CN202210885025 A CN 202210885025A CN 115164458 B CN115164458 B CN 115164458B
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- 238000000034 method Methods 0.000 title claims abstract description 62
- 230000000903 blocking effect Effects 0.000 title claims abstract description 49
- 230000002265 prevention Effects 0.000 title claims abstract description 33
- 239000003507 refrigerant Substances 0.000 claims abstract description 134
- 238000010438 heat treatment Methods 0.000 claims abstract description 120
- 238000010257 thawing Methods 0.000 claims abstract description 114
- 238000005338 heat storage Methods 0.000 claims abstract description 83
- 238000009413 insulation Methods 0.000 claims abstract description 46
- 230000009471 action Effects 0.000 claims description 29
- 238000005057 refrigeration Methods 0.000 claims description 26
- 230000007613 environmental effect Effects 0.000 claims description 24
- 238000007599 discharging Methods 0.000 claims description 4
- 239000003921 oil Substances 0.000 abstract description 120
- 238000004321 preservation Methods 0.000 abstract description 39
- 230000008569 process Effects 0.000 abstract description 30
- 238000012546 transfer Methods 0.000 abstract description 6
- 239000010726 refrigerant oil Substances 0.000 abstract 1
- 239000010687 lubricating oil Substances 0.000 description 26
- 239000010705 motor oil Substances 0.000 description 9
- 239000002699 waste material Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000002411 adverse Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 5
- 238000001704 evaporation Methods 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000010586 diagram 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
- 239000010721 machine oil Substances 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
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- 238000007906 compression Methods 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 230000003211 malignant effect Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000001294 propane Substances 0.000 description 1
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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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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 blocking prevention control method thereof, the air conditioner comprises: the refrigerating system and the refrigerating circulation loop are provided with a branch exhaust pipe, and one end of the branch exhaust pipe, which is close to the compressor, is provided with a branch electronic expansion valve; 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 outdoor environment temperature, the temperature behind the valve and the temperature of the outdoor coil are combined to control the opening or closing of the branch electronic expansion, so that when the branch electronic expansion valve is in the opening state, the heat storage and heat preservation module stores heat of a refrigerant flowing through the branch exhaust pipe and transfers the heat to the main electronic expansion valve, and the main electronic expansion valve and two filters connected to two ends of the main electronic expansion valve are heated. The invention can effectively prevent the refrigerant oil blocking phenomenon in the low-temperature heating starting and defrosting processes of the air conditioner, thereby improving the operation safety and reliability 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 blocking prevention control method thereof.
Background
At present, R290 (Propane) and R32 and other refrigerants with low GWP (Global Warming Potential ) are attracting attention as novel environment-friendly refrigerants, and are beginning to be widely used in small-sized refrigeration equipment such as home air-conditioning. Because the refrigerants such as R290 and R32 belong to combustible refrigerants, the dangerous grade is higher, and because of safety, the charging amount of the refrigerants is strictly limited when the refrigerants are applied to products, the operating pressure of a refrigerating system adopting the R290 refrigerant is lower, especially the operating pressure is lower when the refrigerants are heated at low temperature, so that in order to increase the refrigerating and heating capacity of an 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 thus, the phenomenon of oil blockage is caused in a low-temperature starting stage or in a defrosting switching stage.
The refrigerating machine oil in the compressor used by the air conditioner plays a vital role in the operation of a refrigerating system, the refrigerating machine oil lubricates, seals and cools the cylinder and the rotor of the compressor, how to ensure the efficient and safe operation of the compressor is more important for R290 refrigerant. The conventional compressor uses a common mineral refrigerator oil, and the viscosity of the refrigerator oil is dramatically increased under low-temperature conditions.
In the air-conditioning product using R290 refrigerant, when the air-conditioner is started at low temperature, the low-temperature refrigerating machine oil in the pipeline and the R290 refrigerant easily form floccules, and the floccules are easily accumulated in the valve when passing through the electronic expansion valve and the filter behind the valve at low temperature, so that the refrigerating system is blocked (commonly called as 'oil blocking'), the balance of the system is damaged, the safety and the reliability of the system are threatened, the air-conditioner is difficult to start, and the complete machine fault of the air-conditioner is caused when the floccules are serious. Therefore, how to effectively prevent the blockage of the throttling device, and ensure that the refrigerator oil in the compressor is at the optimal temperature when the compressor is started to operate under the low-temperature condition, and the good lubricating performance is one of the problems for ensuring the normal operation of the air conditioner.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention aims to provide an air conditioner and an oil blocking prevention control method thereof.
The invention provides an air conditioner, comprising: the refrigerating system is used for exchanging the positions of the air suction pipe and the air discharge pipe in the refrigerating circulation loop so as to heat indoor air by utilizing the evaporator to realize heating operation of the air conditioner, and comprises a compressor which is used for compressing low-temperature low-pressure refrigerant gas into high-temperature high-pressure refrigerant gas and discharging the high-temperature high-pressure refrigerant gas to the condenser; the refrigeration cycle loop is used for enabling a refrigerant to circulate in a loop formed by 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, which is 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 valve back temperature sensor is arranged at one end of the main electronic expansion valve, which is close to the compressor, and is used for detecting the valve back 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; a controller configured to: the method comprises the steps of obtaining the running state of the air conditioner, controlling the opening or closing of the branch electronic expansion according to the running state of the air conditioner, combining the outdoor environment temperature, the temperature after the valve and the temperature of the outdoor coil pipe, so that when the branch electronic expansion valve is in the opening state, the heat storage and insulation module stores heat of a refrigerant flowing through the branch exhaust pipe, and transmitting 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, through designing the branch exhaust pipe of the exhaust pipeline of the compressor and the heat storage and heat preservation module positioned on the branch exhaust pipe, a heat source is independently led out to heat the heat storage and heat preservation module, when the main electronic expansion valve and the filters in front and behind the main electronic expansion valve are subjected to oil blockage in the low-temperature heating starting and defrosting switching process of the air conditioner, the exhaust temperature of the compressor is higher and higher, the heat brought by the exhaust temperature is stored into the heat storage and heat preservation module through controlling the branch electronic expansion valve on the branch exhaust pipe, and then the heat is transferred into the main electronic expansion valve wrapped in the heat storage and heat preservation module and the filters in front and behind the main electronic expansion valve, so that the oil blockage of the main electronic expansion valve and the filters in front and behind the main electronic expansion valve is prevented. The air conditioner utilizes the exhaust temperature to balance the problem of oil blockage behind the main electronic expansion valve in the low-temperature heating start and defrosting process, utilizes the principle that the serious exhaust temperature is higher when the oil blockage is generated to correct the oil blockage degree, prevents the adverse effect caused by the oil blockage, opens the branch electronic expansion valve on the branch exhaust pipe in the low-temperature heating start and defrosting switching process, and allows part of 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 on the main flow path, and the heat storage and heat preservation module is coated outside the branch exhaust pipe to prevent heat loss, and transfers the heat to the main electronic expansion valve to heat the heat storage and heat preservation module after the high-temperature refrigerant in the branch exhaust pipe is used for heating the heat storage and heat preservation module, thereby effectively preventing and improving the oil blockage phenomenon generated in the low-temperature heating or defrosting switching heating process of the refrigerant, and improving the reliability and safety of the operation of the air conditioner; meanwhile, the air conditioner is simple in structure, few in design parts, low in cost and high in reliability.
In addition, the air conditioner according to the embodiment of the invention can also have the following additional technical characteristics:
in an embodiment of the invention, the controller is specifically configured to: determining whether the outdoor environment temperature reaches a preset environment temperature threshold value or not when the air conditioner is started and the heating operation is performed; 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 according to a preset opening degree; and if the outdoor environment temperature reaches the environment temperature threshold, controlling the bypass electronic expansion valve to be closed.
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 after the valve of the main electronic expansion valve reaches a preset first pour point temperature threshold value or not; if the valve post temperature of the main electronic expansion valve reaches the first pour point temperature threshold, controlling the branch electronic expansion to be in an opening state according to 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: and the branch electronic expansion valve is opened according to the preset opening degree, and the opening degree is gradually increased according to the preset opening degree increment until the valve back temperature of the main electronic expansion valve reaches a preset second pour point temperature threshold value, and the branch electronic expansion valve is controlled to be closed, 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 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 defrosting temperature outdoor coil does not reach the defrosting temperature threshold, controlling the branch electronic expansion valve to be in an open state according to a preset opening degree, and further judging whether the temperature after the valve of the main electronic expansion valve reaches a preset third pour point temperature threshold or not; if the valve back temperature of the main electronic expansion valve reaches the third pour point temperature threshold value, controlling the branch electronic expansion to be in an opening state according to 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 according to the preset opening degree, and the opening degree is gradually increased according to the preset opening degree increment until the temperature behind the main electronic expansion valve reaches a preset fourth pour point temperature, and the branch electronic expansion valve is controlled to be closed, wherein the fourth pour point temperature is larger 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, controlling the bypass electronic expansion valve to be in an opening state according to a preset opening degree.
In an embodiment of the invention, the controller is further configured to: and when the air conditioner is determined to be in a non-heating operation, controlling the branch electronic expansion valve to be in a closed state.
In the embodiment of the invention, the heat storage and insulation module is arranged at the return bend of the branch exhaust pipe.
The invention also provides an oil blocking prevention control method of the air conditioner, aiming at the problems, comprising the following steps: acquiring the running state of the air conditioner, the outdoor environment temperature, the valve back temperature of the back end of a main electronic expansion valve in a refrigeration cycle loop and the temperature of an outdoor coil pipe of an outdoor heat exchanger; according to the running state of the air conditioner, the outdoor environment temperature, the temperature after the valve and the temperature of the outdoor coil pipe are combined to control the opening or closing of branch electronic expansion in the refrigeration cycle loop, so that when the branch electronic expansion valve is in the opening state, the heat storage and heat preservation module stores heat of a refrigerant flowing through the branch exhaust pipe, the heat is transferred to the main electronic expansion valve and two filters connected with two ends of the main electronic expansion valve to heat the main electronic expansion valve and the two filters connected with two ends of the main electronic expansion valve, 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 with two ends of the main electronic expansion valve.
According to the oil blockage prevention control method for the air conditioner, through designing the branch exhaust pipe of the exhaust pipeline of the compressor and the heat storage and heat preservation module positioned on the branch exhaust pipe, one heat source is independently led out to heat the heat storage and heat preservation module, when the main electronic expansion valve and the filters in front and behind the main electronic expansion valve are blocked with oil in the low-temperature heating starting and defrosting switching process of the air conditioner, the exhaust temperature of the compressor is higher and higher, heat brought by the exhaust temperature is stored into the heat storage and heat preservation module through controlling the branch electronic expansion valve on the branch exhaust pipe, and then the heat is transferred into the main electronic expansion valve wrapped in the heat storage and heat preservation module and the filters in front and behind the main electronic expansion valve, so that the main electronic expansion valve and the filters in front and behind the main electronic expansion valve are melted and prevented from being blocked with oil. The method comprises the steps of utilizing the exhaust temperature to balance the problem of oil blockage after a main electronic expansion valve is started in a low-temperature heating process and in a defrosting process, utilizing the principle that the serious exhaust temperature is higher when the oil blockage is generated, correcting the degree of the oil blockage, preventing adverse effects caused by the oil blockage, opening a branch electronic expansion valve on a branch exhaust pipe in the low-temperature heating start and defrosting switching process, enabling part of high-temperature refrigerant in the exhaust pipe to enter the branch exhaust pipe, enabling the branch exhaust pipe to be close to the main electronic expansion valve on a main flow path, coating a heat storage and insulation module outside the branch exhaust pipe, preventing heat loss, and transmitting heat to the main electronic expansion valve to heat the heat storage and insulation module after the high-temperature refrigerant in the branch exhaust pipe is used for heating the heat storage and insulation module, so that 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 safety of air conditioner operation are improved.
In addition, the oil blocking 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 bypass 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 or not when the air conditioner is started and the heating operation is performed; 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 according to a preset opening degree; and if the outdoor environment temperature reaches the environment temperature threshold, controlling the bypass electronic expansion valve to be closed.
In an embodiment of the present invention, after determining that the outdoor ambient temperature does not reach the ambient temperature threshold, it further includes: judging whether the temperature after the valve of the main electronic expansion valve reaches a preset first pour point temperature threshold value or not; if the valve post temperature of the main electronic expansion valve reaches the first pour point temperature threshold, controlling the branch electronic expansion to be in an opening state according to 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: and the branch electronic expansion valve is opened according to the preset opening degree, and the opening degree is gradually increased according to the preset opening degree increment until the valve back temperature of the main electronic expansion valve reaches a preset second pour point temperature threshold value, and the branch electronic expansion valve is controlled to be closed, 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, it 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 according to a preset opening degree, and further judging whether the temperature after the valve of the main electronic expansion valve reaches a preset third pour point temperature threshold or not; if the valve back temperature of the main electronic expansion valve reaches the third pour point temperature threshold value, controlling the branch electronic expansion to be in an opening state according to 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 according to the preset opening degree, and the opening degree is gradually increased according to the preset opening degree increment until the temperature behind the main electronic expansion valve reaches a preset fourth pour point temperature, and the branch electronic expansion valve is controlled to be closed, wherein the fourth pour point temperature is larger 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 foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic view of a structure of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a refrigerant circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an overall execution flow of a controller of an air conditioner according to one embodiment of the present invention;
fig. 4 is a flowchart of an anti-blocking control method of an air conditioner according to an embodiment of the present invention;
fig. 5 is a flowchart of an anti-blocking control method of an air conditioner according to another embodiment of the present invention;
fig. 6 is a flowchart of an anti-blocking control method of an air conditioner according to still another embodiment of the present invention;
fig. 7 is a flowchart of an anti-blocking control method of an air conditioner according to still another embodiment of the present invention.
Reference numerals:
1000-an air conditioner;
a 100-refrigeration system; 110-a refrigeration cycle;
1-a compressor; 2-an indoor heat exchanger; 3-an outdoor ambient temperature sensor; 4-four-way valve; 5-an outdoor heat exchanger; 6-an outdoor coil temperature sensor; 7-a main electronic expansion valve; 8-a filter; 9-branch electronic expansion valve; 10-a heat storage and insulation module; 11-a post-valve temperature sensor;
200-controller.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The air conditioner of the present invention performs a refrigerating 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 a refrigerant to the air that has been conditioned and heat exchanged. The condenser and the evaporator both belong to the heat exchanger, and are the condenser when the heat exchanger realizes the condensing function, and are the evaporator when the heat exchanger realizes the evaporating function.
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 may achieve a cooling effect by exchanging heat with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner may adjust the temperature of the indoor space throughout the cycle.
An outdoor unit of an air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, an 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 function as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater of a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler of a cooling mode.
In 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 flows through the condenser to heat the indoor air by heat exchange with the indoor air, and is cooled by self-heat radiation. The low-temperature high-pressure refrigerant whose temperature is removed by the condenser is depressurized by the expansion valve to be changed into a low-temperature low-pressure refrigerant. The refrigerant flowing into the evaporator through the expansion valve is heated by heat exchange with the outdoor air. The primarily low temperature gaseous refrigerant is then drawn from the evaporator into the compressor via the accumulator.
An air conditioner and an oil blocking prevention control method thereof according to an embodiment of the present invention will be described 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 view of a structure 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 thermal storage and insulation module 10, an outdoor ambient temperature sensor 3, a post-valve temperature sensor 11, an outdoor coil temperature sensor 6, and a controller 200. Wherein the refrigeration system 100 includes a refrigeration cycle 110.
As shown in fig. 2, the refrigeration cycle 110 is composed of 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 provided at both ends of the main electronic expansion valve 7, a bypass electronic expansion valve 9, and two filters 8 provided at both ends of the bypass electronic expansion valve 9.
Wherein an outdoor ambient temperature sensor 3 is provided on the indoor heat exchanger 2 for detecting an outdoor ambient temperature.
The 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 of a rear end of the main electronic expansion valve 7.
An outdoor coil temperature sensor 6 is provided on the outdoor heat exchanger 5 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 suction and discharge pipes in the refrigeration cycle 110 to heat the indoor air by using the evaporator to perform a 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 low-pressure refrigerant gas into a high-temperature high-pressure refrigerant gas and discharging the high-pressure refrigerant gas to the condenser.
As shown in fig. 2, the refrigeration cycle 110 circulates a refrigerant in a circuit composed of the compressor 1, the indoor heat exchanger 2, the four-way valve 4, the outdoor heat exchanger 5, and the main electronic expansion valve 7, wherein two ends of the main electronic expansion valve 7 are connected to one filter 8.
As shown in fig. 2, the exhaust end of the compressor 1 is connected with one end of the four-way valve 4 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 7, namely, the branch exhaust pipe is close to the main electronic expansion valve 7, one end of the branch exhaust pipe close 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 with a filter 8.
The heat accumulation and heat 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, when the branch electronic expansion valve 9 is in an open state, the branch exhaust pipe is conducted, the refrigerant flows into the branch exhaust pipe, the heat accumulation and heat preservation module 10 can store 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. In a specific embodiment, the heat storage and insulation module 10 includes a heat storage material and an insulation material, which can effectively prevent heat loss, thereby realizing heat storage, insulation and heat transfer.
Based on the above structure, the controller 200 is configured to: the operation state of the air conditioner 1000 is obtained, and the opening or closing of the branch electronic expansion is controlled according to the operation state of the air conditioner 1000 by combining the outdoor environment temperature, the temperature after the valve and the temperature of the outdoor coil pipe, so that when the branch electronic expansion valve 9 is in the opening state, 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 blocking phenomenon generated in the low-temperature heating or defrosting switching heating process of the refrigerant, and further improving the reliability and safety of the operation of the air conditioner.
In summary, according to the air conditioner 1000 of the present invention, by designing the branch exhaust pipe of the exhaust pipeline of the compressor 1 and the heat storage and insulation module 10 located on the branch exhaust pipe, a heat source is led out separately to heat the heat storage and insulation module 10, when the main electronic expansion valve 7 and the filters 8 in front and behind the main electronic expansion valve 7 are blocked during the low-temperature heating start and defrosting switching process of the air conditioner 1000, the exhaust temperature of the compressor 1 will be higher and higher, the heat brought by the exhaust temperature is stored into 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 wrapped in the heat storage and insulation module 10 and the filters 8 in front and behind the main electronic expansion valve 7, so as to melt and prevent the oil blocking of the main electronic expansion valve 7 and the filters 8 in front and behind. That is, the air conditioner 1000 uses the exhaust temperature to balance the problem of oil blockage after the main electronic expansion valve 7 in the low-temperature heating start and defrosting process, uses the principle that the more serious the oil blockage is, the higher the exhaust temperature is, to correct the oil blockage degree, and prevent the adverse effect caused by the oil blockage, in the low-temperature heating start and defrosting switching process, opens the branch electronic expansion valve 9 on the branch exhaust pipe, part of the high-temperature refrigerant in the exhaust pipe enters the branch exhaust pipe, the branch exhaust pipe is close to the main electronic expansion valve 7 on the total flow path, and the heat storage and insulation module 10 is coated outside to prevent heat loss, and uses the high-temperature refrigerant in the branch exhaust pipe to heat the heat storage and insulation module 10, and then transfer the heat to the main electronic expansion valve 7 to heat the heat storage and insulation module, thereby effectively preventing and improving the oil blockage phenomenon generated in the refrigerant low-temperature heating or defrosting switching heating process, and improving the reliability and safety of the operation of the air conditioner; meanwhile, the air conditioner 1000 has the advantages of simple structure, fewer design parts, low cost and high reliability.
In one embodiment of the invention, the controller 200 is specifically configured to: when the air conditioner 1000 is determined to be started and the heating operation is performed, judging whether the outdoor environment temperature reaches a preset environment temperature threshold value or not; if the outdoor ambient temperature does not reach the ambient temperature threshold value, the branch electronic expansion valve 9 is controlled to be in an open state according to the preset opening; if the outdoor ambient temperature reaches the ambient temperature threshold, the control branch electronic expansion valve 9 is closed.
Specifically, the preset environmental temperature threshold is a preset temperature value, and is set according to, for example, whether the outdoor environmental temperature is low or not, and when the outdoor environmental temperature reaches the preset environmental temperature threshold, the outdoor environmental is considered to be a non-low temperature condition, and when the outdoor environmental temperature does not reach the preset environmental temperature threshold, the outdoor environmental is considered to be a low temperature condition. In a specific embodiment, the preset environmental temperature threshold is, for example, 7 ℃, that is, when the outdoor environmental temperature reaches 7 ℃, the outdoor environment is considered to be not in a low-temperature condition, and when the outdoor environmental temperature does not reach 7 ℃, the outdoor environment is considered to be in a low-temperature condition.
Specifically, when it is determined that the air conditioner 1000 is turned on and is in heating operation, and the outdoor ambient temperature does not reach the preset ambient temperature threshold, for example, when the outdoor ambient temperature is 7 ℃, it is considered that the ambient temperature is higher at this time, that is, the air conditioner is in a low-temperature heating starting working condition, oil blockage easily occurs, then the bypass electronic expansion valve 9 is controlled to be in an open state with a preset opening degree, so that the refrigerant flows into the bypass pipe, thereby the heat storage and insulation module 10 stores the heat of the refrigerant flowing through the bypass pipe, and transmits the heat to the main electronic expansion valve 7 and the two filters 8 connected to 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 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 operation of the air conditioner. 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, for example, when the ambient temperature is 7 ℃, it is considered that the ambient temperature is higher at this time, that is, the air conditioner is not in a low-temperature heating starting working condition, and is not easy to cause oil blockage, the control branch electronic expansion valve 9 is 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, thereby avoiding wasting the refrigerant flow.
In an embodiment of the present 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 valve back temperature of the main electronic expansion valve 7 reaches a first pour point temperature threshold value, controlling the electronic expansion of the branch circuit to be in an opening state according to 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 control branch electronic expansion valve 9 performs a first preset action, where the first preset action includes: the bypass electronic expansion valve 9 is opened at a preset opening degree, and the opening degree is gradually increased according to a preset opening degree increasing amount, until the valve rear temperature of the main electronic expansion valve 7 reaches a preset second pour point temperature threshold value, and the bypass 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 blocking prevention protection for 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 in accordance with, for example, whether the engine oil reaches the minimum temperature at which the engine oil is to be coagulated or not, and when it is determined 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 oil is to be coagulated or that the oil blockage is to occur; when it is judged that the post valve temperature of the main electronic expansion valve 7 does not reach the preset first pour point temperature threshold, it is considered that the engine lubricating oil has coagulated, i.e., oil clogging occurs.
The second pour point temperature is a preset temperature value, and when it is determined that the post-valve temperature of the main electronic expansion valve 7 reaches the preset second pour point temperature threshold, it is considered that the temperature of the engine lubricating oil is high, and no oil blockage occurs. The second pour point temperature is greater than the first pour point temperature. In a specific embodiment, to ensure the accuracy and reliability of the oil blocking control, the second pour point temperature may be set to the sum of the first pour point temperature and a first predetermined temperature margin, denoted as λ, which may take a value in the range of, for example, 0-20 ℃.
Specifically, after determining that the outdoor ambient temperature does not reach the ambient temperature threshold, further determining whether the post-valve temperature of the main electronic expansion valve 7 reaches a preset first pour point temperature threshold; if the temperature of the main electronic expansion valve 7 after the valve reaches the first pour point temperature threshold, the engine lubricating oil is about to be condensed and is about to be blocked, the branch electronic expansion is controlled to be in an open state with a preset opening degree, so that the refrigerant flows into the branch exhaust pipe, the heat storage and insulation 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 blocking phenomenon in the low-temperature heating or defrosting switching heating process of the refrigerant, and further improving the reliability and safety of the operation of the air conditioner. If the post valve temperature of the main electronic expansion valve 7 does not reach the first pour point temperature threshold, the engine oil is considered to have condensed, i.e. has oil blockage has occurred, the control branch electronic expansion valve 9 performs a first preset action, which includes: the bypass 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, when the temperature after the valve of the main electronic expansion valve 7 reaches a preset second pour point temperature threshold value with higher temperature, the temperature of engine lubricating oil is considered to be higher, oil blockage cannot occur, the bypass 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, thereby avoiding the waste of the refrigerant flow. Therefore, the oil blocking prevention protection for the low-temperature heating start of the air conditioner is completed. In a specific embodiment, the preset opening increase is, for example, the frequency of M steps per minute, that is, the bypass electronic expansion valve 9 is controlled to be opened at the preset opening, and the valve opening is continuously increased according to the frequency of M steps per minute, until the temperature after the valve of the main electronic expansion valve 7 reaches the preset second pour point temperature threshold with higher temperature, and the bypass electronic expansion valve 9 is controlled to be closed.
As a specific example, in conjunction with fig. 1 and 2, specifically, when the air conditioner 1000 heats, the gaseous refrigerant flows out from the compressor 1, flows into the indoor heat exchanger 2 through the main exhaust pipe and the four-way valve 4 to be condensed into a liquid state, flows out of the indoor heat exchanger 2, flows into the outdoor heat exchanger 5 to be evaporated into a gas state after being throttled by the main electronic expansion valve 7, and thus completes one cycle. When the temperature after the valve of the main electronic expansion valve 7 is less than or equal to the first pour point temperature threshold value, the branch electronic expansion valve 9 is controlled to be opened to a preset opening degree, and the refrigerant part flows into the branch exhaust pipe so as to enable the heat storage and heat preservation module 10 to start heat storage; when the air conditioner 1000 is started at low temperature and is in heating operation (i.e. the outdoor ambient temperature does not reach the ambient temperature threshold value) or the air conditioner is in defrosting and is switched to heating operation, 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 7 so as to heat the main electronic expansion valve, 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 heating operation after defrosting, and the reliability and safety of the air conditioner operation are improved. And when the valve back temperature of the main electronic expansion valve 7 is greater than or equal to the second pour point temperature threshold value, the control branch electronic expansion valve 9 is closed, and the refrigerant only passes through the main exhaust pipe and no longer passes through the branch exhaust pipe, so that the refrigerant energy waste 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 defrosting temperature outdoor coil does not reach the defrosting temperature threshold, controlling the branch electronic expansion valve 9 to be in an opening state according to a preset opening degree, and further judging whether the post-valve temperature of the main electronic expansion valve 7 reaches a preset third pour point temperature threshold; if the valve back temperature of the main electronic expansion valve 7 reaches a third pour point temperature threshold value, controlling the electronic expansion of the branch circuit to be in an opening state according to 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, the control branch electronic expansion valve 9 performs a second preset action, which includes: the bypass electronic expansion valve 9 is opened at a preset opening degree, and the opening degree is gradually increased according to a preset opening degree increasing amount, until the valve back temperature of the main electronic expansion valve 7 reaches a preset fourth pour point temperature, the bypass electronic expansion valve 9 is controlled to be closed, wherein the fourth pour point temperature is larger 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 1000 needs to perform a defrosting operation, and when it is determined that the outdoor coil temperature of the outdoor heat exchanger 5 is less than or equal to the preset defrosting temperature threshold, the air conditioner system performs a defrosting operation, that is, the air conditioner 1000 performs a defrosting operation, otherwise, the air conditioner system does not perform a defrosting operation. In a specific embodiment, in order to ensure the accuracy and reliability of the defrosting judgment of the air conditioner, the defrosting temperature threshold may be set to be 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 value of η is, for example, in the range of 0-5 ℃.
The third pour point temperature threshold value is a preset temperature value which is set according to, for example, the evaluation of whether the engine lubricating oil reaches the minimum temperature to be coagulated, 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 coagulated and oil blockage is about to occur; when it is judged that the post valve temperature of the main electronic expansion valve 7 does not reach the preset third pour point temperature threshold, it is considered that the engine lubricating oil has coagulated, i.e., oil clogging has occurred. 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 it is determined that the post-valve temperature of the main electronic expansion valve 7 reaches the preset fourth pour point temperature threshold, it is considered that the temperature of the engine lubricating oil is high, and no oil blockage occurs. The fourth pour point temperature is greater than the third pour point temperature. In a specific embodiment, to ensure the accuracy and reliability of the oil blocking control, the fourth pour point temperature may be the sum of the third pour point temperature and a first predetermined temperature margin, denoted as λ, which may take a value in the range of, for example, 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 ambient temperature does not reach the ambient temperature threshold, further determining whether the outdoor coil temperature reaches a preset defrost 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, namely defrosting is performed, the branch electronic expansion valve 9 is controlled to be in an opening state according to 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 heat in advance, and the main electronic expansion valve 7 and the front and rear filters 8 thereof are used for heating when defrosting and defrosting are switched for heating, so that oil blockage is prevented, and the oil blockage phenomenon 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, judging whether the temperature after the valve of the main electronic expansion valve 7 reaches a preset third pour point temperature threshold value; if the temperature of the main electronic expansion valve 7 after the valve reaches the third pour point temperature threshold, the engine lubricating oil is about to be condensed and is about to be blocked, the branch electronic expansion is controlled to be in an open state with a preset opening degree, so that the refrigerant flows into the branch exhaust pipe, the heat storage and insulation 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 blocking phenomenon in the low-temperature heating or defrosting switching heating process of the refrigerant, and further improving the reliability and safety of the operation of the air conditioner. If the post valve temperature of the main electronic expansion valve 7 does not reach the third pour point temperature threshold, the engine oil is considered to have condensed, i.e. has oil blockage has occurred, the control branch electronic expansion valve 9 performs a second preset action, which includes: the bypass 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, when the temperature after the valve of the main electronic expansion valve 7 reaches a preset fourth pour point temperature with higher temperature, the bypass electronic expansion valve 9 is controlled to be closed, the engine lubricating oil temperature is considered to be higher, oil blockage cannot occur, the bypass 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, thereby avoiding the waste of the refrigerant flow. Therefore, oil blocking prevention protection in the defrosting, switching and heating processes of the air conditioner is completed. In a specific embodiment, the preset opening increase is, for example, the frequency of M steps per minute, that is, the bypass electronic expansion valve 9 is controlled to be opened at the preset opening, and the valve opening is continuously increased according to the frequency of M steps per minute, until the temperature after the valve of the main electronic expansion valve 7 reaches the preset fourth pour point temperature threshold with higher temperature, and the bypass electronic expansion valve 9 is controlled to be closed. Wherein M is a preset step length.
As a specific embodiment, referring to fig. 1 and 2, specifically, when the air conditioner 1000 is in the defrosting condition, the high-temperature gaseous refrigerant discharged from the compressor 1 enters the outdoor heat exchanger 5 through the four-way valve 4 to perform condensation, heat release and defrosting, then enters the indoor heat exchanger 2 through the main electronic expansion valve 7 to perform evaporation and heat absorption, and finally enters the four-way valve 4 to return to the compressor 1, thereby completing the whole cycle. Since the defrosting causes the indoor heat exchanger 2 and the area near the main electronic expansion valve 7 to be in a low temperature state, when the air conditioner 1000 is switched from defrosting to a heating operation mode again, the oil blocking phenomenon is very easy to occur near 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 before the defrosting is switched to the heating mode, the branch electronic expansion valve 9 is controlled to be opened to a preset opening degree, the heat storage and heat preservation module 10 is utilized to store heat, so that the heat storage and heat preservation module 10 heats the area near the main electronic expansion valve 7 and the filters 810 at the front end and the rear end of the main electronic expansion valve through heat transfer, and the temperature of the heat storage and heat preservation module is increased to a normal level, for example, the fourth preset pour point temperature is reached, and thus the oil blocking 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.
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, the control branch electronic expansion valve 9 is in an opening state with a preset opening degree.
Specifically, when the temperature of the outdoor coil reaches the defrosting temperature threshold under the low-temperature working condition, the air conditioner is not in the defrosting mode, and the air conditioner is not defrosted at the moment, and is in the heating operation, the control branch electronic expansion valve 9 is in the opening state according to the 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 that the main electronic expansion valve 7 and the two filters 8 connected to the two ends of the main electronic expansion valve 7 are heated, and 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 invention, the controller 200 is further configured to: when it is determined that the air conditioner 1000 is not operating for heating, the control bypass electronic expansion valve 9 is in a closed state.
Specifically, when the air conditioner is not in heating operation and is not in defrosting mode at the moment under the low-temperature working condition, the compressor 1 lubricating oil is considered not to be blocked, the control branch electronic expansion valve 9 is 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, thereby avoiding wasting the refrigerant flow.
Therefore, in the embodiment, when the air conditioner 1000 is started at low temperature and the defrosting is switched to the heating operation, and when the main electronic expansion valve 7 and the filters 8 at the front end and the rear end thereof are blocked, the exhaust temperature of the compressor 1 will be higher and higher, the heat brought by the exhaust temperature is stored into the heat storage and insulation module 10 by controlling the opening and closing states of the branch electronic expansion valve 9, and the heat storage and insulation module 10 melts and prevents the main electronic expansion valve 7 and the filters 8 at the front end and the rear end thereof from being blocked by the heat. According to the embodiment of the invention, a path of heat source is independently led out through the design of the branch exhaust pipe, flows through the heat accumulation and heat preservation module 10 to accumulate heat, and heats the main electronic expansion valve 7 and the filters 8 at the front end and the rear end of the main electronic expansion valve 7 in a period, so that 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 from being blocked by oil, the problem that 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 blocked by oil in the process of starting the air conditioner 1000 in low-temperature heating and switching defrosting into heating operation is thoroughly solved on the premise that the refrigerating working condition and normal-temperature heating of the air conditioner 1000 are not influenced, and the operation reliability and safety of the air conditioner 1000 are improved.
In one embodiment of the present invention, the heat storage and insulation module 10 is disposed at the return bend of the branch exhaust pipe, thereby preventing the occurrence of a liquid return phenomenon and improving the reliability and safety of the operation of the air conditioner. Further, the heat storage and insulation 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 when the oil blocking prevention control is performed is described below with reference to fig. 3.
The embodiment of the invention mainly aims at 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 at low temperature, as 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 unbalance is easy to generate at the moment of starting, the temperature is rapidly reduced, the pressure is more unbalanced, the temperature is rapidly reduced, the oil blockage is more serious, and the air conditioning system is in malignant circulation; when defrosting is switched to a heating mode, the influence caused by the vicious circle is more obvious, the exhaust of the compressor 1 is rapidly increased by the oil blockage, and finally, the compressor 1 is triggered to be stopped by exhaust protection, so that irreversible influence is often caused to the compressor 1. Based on this, in a specific embodiment, the working principle of the air conditioner 1000 according to the embodiment of the present invention for implementing oil blocking 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 storage and heat preservation module 10 to store heat, and then the heat storage 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 7, so that the risk that the air conditioner 1000 is blocked by oil in the low-temperature heating starting and defrosting process is avoided, and the higher the exhaust temperature of the compressor 1 is, the heat of the high-temperature refrigerant of the branch exhaust pipe of the compressor 1 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 occurrence of oil blocking is effectively avoided, the air conditioner 1000 is in a benign cycle, and the air conditioner 1000 has simple structure, fewer design parts, low cost and high reliability in the oil blocking prevention control process.
In a specific embodiment, a specific execution flow of the controller 200 of the air conditioner 1000 in the oil blocking prevention control is described with reference to fig. 3. Firstly, introducing the following related parameters, and presetting pour point temperature after lubricating oil valve to be T Pour point Which can be measured experimentally; post valve temperature T of main electronic expansion valve 7 Behind the valve The method comprises the steps of carrying out a first treatment on the surface of the The outdoor environment temperature detected by the outdoor environment 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 ℃; η 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 Outer coil pipe The method comprises the steps of carrying out a first treatment on the surface of the Defrosting set temperature set by air conditioner 1000 is T DefrostingSetting up When T Outer coil pipe ≤T Defrost settings At this time, the air conditioner 1000 performs a defrosting operation.
In the specific embodiment, as shown in fig. 3, during the anti-blocking control of the air conditioner 1000, the controller 200 mainly performs the following steps S101 to S117. Step S101 to step S108 are corresponding flows when the air conditioner is started at low temperature for heating, and step S109 to step S117 are corresponding flows when the air conditioner is defrosted and switched to heating.
Step S101: the air conditioner 1000 is turned on to determine whether it is in the heating mode, and if so, the process proceeds to step S103, and if not, the process proceeds to step S102.
Step S102: if the air conditioner 1000 is operating in the heating mode, the outdoor ambient temperature T is further determined Outer ring If the temperature is less than or equal to 7 ℃, executing step S104 if yes, otherwise, turning to step S103.
Step S103: the air conditioner 1000 operates at a non-heating mode or an external 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 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, is opened at a preset opening, and the post-valve temperature T of the main electronic expansion valve 7 is further judged Post valve temperature Whether or not it is less than the pour point temperature T of the lubricating oil Pour point If yes, step S106 is executed, otherwise step S105 is executed. .
Step S105: if the valve temperature T Post valve temperature Above pour point temperature T Pour point The bypass electronic expansion valve 9 is controlled to be in an initial opening state.
Step S106: if the valve temperature T Post valve temperature Below pour point temperature T Pour point The bypass electronic expansion valve 9 is controlled to be in an initial opening state, and the frequency of executing the M steps per minute does not open the valve, and the flow proceeds to step S107.
Step S107: judging the post-valve temperature T of the main electronic expansion valve 7 Post valve temperature Whether or not to be greater than or equal toT Pour point +λ (λ is the temperature margin, and the value range is 0-20 ℃), if yes, step S108 is executed, otherwise, step S106 is returned to.
Step S108: when the valve back temperature T of the main electronic expansion valve 7 Post valve temperature Greater than or equal to T Pour point And +lambda, at this time, the branch electronic expansion valve 9 is closed, and the oil blocking prevention protection of the air conditioner 1000 during low-temperature heating start is completed.
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 the outdoor environment temperature T Outer ring If the temperature is lower than 7 ℃, step S112 is executed, otherwise step S111 is skipped.
Step S111: if the air conditioner 1000 is not in heating operation or outdoor ambient temperature T Outer ring Above 7 ℃, the branch electronic expansion valve 9 is controlled to be in a closed state.
Step S112: if the outdoor environment temperature T Outer ring If the temperature is lower than 7 ℃, the temperature T of the outdoor coil pipe is continuously detected Outer coil pipe Judgment of T Outer coil pipe Whether or not to be lower than the defrosting set temperature T Defrost settings +η (η is the temperature margin and the value range is 0-5 ℃), if yes, step S114 is executed, otherwise, step S113 is executed.
Step S113: if T Outer coil pipe Whether or not it is higher than the defrosting set temperature T Defrost settings +eta, the branch electronic expansion valve 9 is controlled to be in an initial opening state, namely, is opened at a preset opening.
Step S114: if T Outer coil pipe Whether or not to be less than or equal to the defrosting set temperature T Defrost settings And if +eta, the branch electronic expansion valve 9 is controlled to be opened to an initial opening degree so as to store heat in advance for the heat storage and heat preservation module 10, and the branch electronic expansion valve is used for heating the main electronic expansion valve 7 and the front and rear filters 8 thereof during defrosting, switching and heating, so that oil blockage is prevented. Detecting the post-valve temperature T of the main electronic expansion valve 7 during defrosting, switching and heating Post valve temperature Whether or not to be less than or equal to the pour point temperature T of the lubricating oil Pour point If yes, step S115 is performed, that is, the bypass electronic expansion valve 9 is controlled to be in the initial opening state,otherwise, the process returns to step S113.
Step S115: if the valve temperature T Post valve temperature Below pour point temperature T Pour point The bypass electronic expansion valve 9 is controlled to be in an initial opening state, and the valve is not opened at the frequency of M steps per minute, and the process proceeds to step S116.
Step S116: judging the post-valve temperature T of the main electronic expansion valve 7 Post valve temperature Whether or not it is greater than or equal to T Pour point +λ (λ is the temperature margin and the range of values is 0 to 20 ℃), if yes, step S117 is executed, otherwise, the process returns to step S115.
Step S117: when the valve back temperature T of the main electronic expansion valve 7 Post valve temperature Greater than or equal to T Pour point And +lambda, at this time, the branch electronic expansion valve 9 is closed, and the oil blocking prevention protection of the air conditioner 1000 during low-temperature heating start is completed.
According to the air conditioner 1000 of the embodiment of the invention, by designing the branch exhaust pipe of the exhaust pipeline of the compressor 1 and the heat storage and insulation module 10 positioned on the branch exhaust pipe, one heat source is independently led out to heat the heat storage and insulation module 10, when the main electronic expansion valve 7 and the filters 8 in front and behind the main electronic expansion valve 7 are blocked with oil in the low-temperature heating starting and defrosting switching process of the air conditioner 1000, the exhaust temperature of the compressor 1 is higher and higher, the heat brought by the exhaust temperature is stored into the heat storage and insulation module 10 through the branch electronic expansion valve 9 on the branch exhaust pipe, and then the heat is transferred into the main electronic expansion valve 7 wrapped in the heat storage and insulation module and the filters 8 in front and behind the main electronic expansion valve 7, so that the oil blocking of the main electronic expansion valve 7 and the filters 8 in front and behind the main electronic expansion valve is prevented. That is, the air conditioner 1000 uses the exhaust temperature to balance the problem of oil blockage after the main electronic expansion valve 7 in the low-temperature heating start and defrosting process, uses the principle that the more serious the oil blockage is, the higher the exhaust temperature is, to correct the oil blockage degree, and prevent the adverse effect caused by the oil blockage, in the low-temperature heating start and defrosting switching process, opens the branch electronic expansion valve 9 on the branch exhaust pipe, part of the high-temperature refrigerant in the exhaust pipe enters the branch exhaust pipe, the branch exhaust pipe is close to the main electronic expansion valve 7 on the total flow path, and the heat storage and insulation module 10 is coated outside to prevent heat loss, and uses the high-temperature refrigerant in the branch exhaust pipe to heat the heat storage and insulation module 10, and then transfer the heat to the main electronic expansion valve 7 to heat the heat storage and insulation module, thereby effectively preventing and improving the oil blockage phenomenon generated in the refrigerant low-temperature heating or defrosting switching heating process, and improving the reliability and safety of the operation of the air conditioner; meanwhile, the air conditioner 1000 has the advantages of simple structure, fewer design parts, low cost and high reliability.
The embodiment of the invention also provides an oil blocking prevention control method of the air conditioner. The following describes, with reference to fig. 4 to 7, an oil blocking prevention control method for an air conditioner according to an embodiment of the present invention, for example, the air conditioner described in any of the foregoing embodiments of the present invention, and thus, regarding a specific composition structure and connection relationship of the air conditioner, the air conditioner described in any of the foregoing embodiments may be considered, that is, the air conditioner includes: the system comprises a refrigeration system, a heat storage and insulation module, an outdoor environment temperature sensor, a valve back temperature sensor, an outdoor coil temperature sensor and a controller, wherein the refrigeration system comprises a refrigeration circulation loop.
The refrigerating system is used for exchanging the positions of the air suction pipe and the air discharge pipe in the refrigerating circulation loop so as to heat indoor air by utilizing the evaporator to realize heating operation of the air conditioner, and comprises a compressor which is used for compressing low-temperature low-pressure refrigerant gas into high-temperature high-pressure refrigerant gas and discharging the high-temperature low-pressure refrigerant gas to the condenser.
The refrigeration cycle loop is used for enabling the refrigerant to circulate in a loop formed by 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, which is 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 two filters connected to two ends of the main electronic expansion valve.
The outdoor environment temperature sensor is used for detecting outdoor environment temperature.
The valve post temperature sensor is arranged at one end of the main electronic expansion valve, which is close to the compressor, and is used for detecting the valve post temperature of the main electronic expansion valve.
The outdoor coil temperature sensor is arranged on the outdoor heat exchanger and is used for detecting the temperature of the outdoor coil.
Fig. 4 is a diagram illustrating an oil blocking prevention control method of an air conditioner according to an embodiment of the present invention. As shown in fig. 4, the oil blocking prevention control method of the air conditioner comprises the following steps:
step S1: and acquiring the running state of the air conditioner, the outdoor environment temperature, the valve back temperature of the back end of the main electronic expansion valve in the refrigeration cycle loop and the outdoor coil temperature of the outdoor heat exchanger.
Step S2: according to the running state of the air conditioner, the outdoor environment temperature, the temperature after the valve and the temperature of the outdoor coil pipe are combined to control the opening or closing of the branch electronic expansion in the refrigeration cycle loop, 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 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, so that the main electronic expansion valve and the two filters connected to the two ends of the main electronic expansion valve are heated, and the oil blocking phenomenon generated 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 heat storage and insulation module is arranged on the branch exhaust pipe and wraps the main electronic expansion valve and two filters connected to two ends of the main electronic expansion valve.
In one embodiment of the present invention, as shown in fig. 5, in step S2, controlling the opening or closing of the bypass electronic expansion in the refrigeration cycle according to the operation state of the air conditioner in combination with the outdoor environment temperature, the post-valve temperature and the outdoor coil temperature includes:
Step S21: when the air conditioner is determined to be started and the heating operation is performed, whether the outdoor environment temperature reaches a preset environment temperature threshold value is judged.
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 according to the preset opening degree.
Step S23: and if the outdoor environment temperature reaches the environment temperature threshold, the control branch electronic expansion valve is closed.
Specifically, the preset environmental temperature threshold is a preset temperature value, and is set according to, for example, whether the outdoor environmental temperature is low or not, and when the outdoor environmental temperature reaches the preset environmental temperature threshold, the outdoor environmental is considered to be a non-low temperature condition, and when the outdoor environmental temperature does not reach the preset environmental temperature threshold, the outdoor environmental is considered to be a low temperature condition. In a specific embodiment, the preset environmental temperature threshold is, for example, 7 ℃, that is, when the outdoor environmental temperature reaches 7 ℃, the outdoor environment is considered to be not in a low-temperature condition, and when the outdoor environmental temperature does not reach 7 ℃, the outdoor environment is considered to be in a low-temperature 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, for example, when the outdoor environment temperature is 7 ℃, the environment temperature is considered to be higher at the moment, namely, the air conditioner is in a low-temperature heating starting working condition and oil blockage is easy to occur, then 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, thereby the heat storage and heat preservation module stores the heat of the refrigerant flowing through the branch exhaust pipe, and 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, so that the main electronic expansion valve and the two filters connected to the two ends of the main electronic expansion valve are heated, and 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. If it is determined that the air conditioner is started and the heating operation is performed, and the outdoor ambient temperature reaches a preset ambient temperature threshold, for example, when the ambient temperature is 7 ℃, the ambient temperature is considered to be higher at the moment, that is, the air conditioner is not in a low-temperature heating starting working condition and is not easy to cause oil blockage, the control branch electronic expansion valve is 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, thereby avoiding the waste of the refrigerant flow.
In one embodiment of the present invention, as shown in fig. 6, in step S2, after determining that the outdoor ambient temperature does not reach the ambient temperature threshold, 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 electronic expansion of the branch circuit to be in an opening state according to the 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: and opening the branch electronic expansion valve with a preset opening degree, and gradually increasing the opening degree according to a preset opening degree increasing amount, and controlling the branch electronic expansion valve to be closed when the valve back 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 is a preset temperature value set in accordance with, for example, whether the engine oil reaches a minimum temperature at which the engine oil is to be coagulated or not, and when it is determined that the post-valve temperature of the main electronic expansion valve reaches the preset first pour point temperature threshold, it is considered that the engine oil is to be coagulated or is to be blocked; 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 coagulated, 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 a preset second pour point temperature threshold value, the temperature of the engine lubricating oil is considered to be higher, so that oil blockage cannot occur. The second pour point temperature is greater than the first pour point temperature. In a specific embodiment, to ensure the accuracy and reliability of the oil blocking control, the second pour point temperature may be set to the sum of the first pour point temperature and a first predetermined temperature margin, denoted as λ, which may take a value in the range of, for example, 0-20 ℃.
Specifically, after the outdoor environment temperature is determined not to reach the environment temperature threshold, further judging whether the post-valve temperature of the main electronic expansion valve reaches a preset first pour point temperature threshold; if the temperature behind the valve of the main electronic expansion valve reaches the first pour point temperature threshold value, the engine lubricating oil is about to be condensed and is about to be blocked, the branch electronic expansion is controlled to be in an opening state with 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 two filters connected to two ends of the main electronic expansion valve, the main electronic expansion valve and the two filters connected to two ends of the main electronic expansion valve are heated, and therefore the oil blocking 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. If the post valve temperature of the main electronic expansion valve does not reach the first pour point temperature threshold, the engine lubricating oil is considered to be condensed, namely oil blockage is generated, the branch electronic expansion valve is controlled to execute a first preset action, and the first preset action comprises: the bypass electronic expansion valve is opened at a preset opening degree, the opening degree is gradually increased according to the preset opening degree increasing amount, when the temperature behind the valve of the main electronic expansion valve reaches a preset second pour point temperature threshold value with higher temperature, the temperature of engine lubricating oil is considered to be higher, oil blockage cannot occur, the bypass electronic expansion valve is controlled to be closed, so that a refrigerant does not flow into the branch exhaust pipe, the air conditioner normally operates, and the refrigerant only passes through the main exhaust pipe, thereby avoiding the waste of refrigerant flow. Therefore, the oil blocking prevention protection for the low-temperature heating start of the air conditioner is completed. In a specific embodiment, the preset opening increment is, for example, the frequency of M steps per minute, that is, the bypass electronic expansion valve is controlled to be opened at the preset opening, and the valve opening is continuously increased according to the frequency of M steps per minute, until the temperature after the valve of the main electronic expansion valve reaches the preset second pour point temperature threshold with higher temperature, and the bypass electronic expansion valve is controlled to be closed.
In one embodiment of the present invention, as shown in fig. 7, in step S2, after determining that the outdoor ambient temperature does not reach the ambient temperature threshold, the method further includes:
step S27: and judging whether the temperature of the outdoor coil reaches a preset defrosting temperature threshold value.
Step S28: if the temperature of the outdoor coil does not reach the defrosting temperature threshold, controlling the branch electronic expansion valve to be in an opening state according to the preset opening degree, and further judging whether the temperature after the valve of the main electronic expansion valve reaches a preset third pour point temperature threshold.
Step S29: and if the valve post temperature of the main electronic expansion valve reaches a third pour point temperature threshold value, controlling the electronic expansion of the branch circuit to be in an opening state according to the 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, 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 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 valve back temperature of the main electronic expansion valve reaches a preset fourth pour point temperature, wherein the fourth pour point temperature is larger than the third pour point temperature.
Specifically, the preset defrosting temperature threshold is a preset temperature value, and is set according to, for example, whether the air conditioner needs to perform defrosting operation or not, when the outdoor coil temperature of the outdoor heat exchanger is judged to be less than or equal to the preset defrosting temperature threshold, the air conditioner system performs defrosting operation, namely, the air conditioner performs defrosting, and otherwise, the air conditioner system does not perform defrosting. In a specific embodiment, in order to ensure the accuracy and reliability of the defrosting judgment of the air conditioner, the defrosting temperature threshold may be set to be 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 value of η is, for example, in the range of 0-5 ℃.
The third pour point temperature threshold is a preset temperature value which is set according to, for example, the evaluation of whether the engine lubricating oil reaches the minimum temperature to be coagulated, and when the valve back 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 coagulated and oil blockage is about to occur; when it is determined that the post valve temperature of the main electronic expansion valve has not reached the preset third pour point temperature threshold, it is considered that the engine oil has coagulated, i.e., oil plugging has occurred. 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 temperature after the valve of the main electronic expansion valve reaches the preset fourth pour point temperature threshold value, the temperature of the engine lubricating oil is considered to be higher, and oil blockage cannot occur. The fourth pour point temperature is greater than the third pour point temperature. In a specific embodiment, to ensure the accuracy and reliability of the oil blocking control, the fourth pour point temperature may be the sum of the third pour point temperature and a first predetermined temperature margin, denoted as λ, which may take a value in the range of, for example, 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 ambient temperature does not reach the ambient temperature threshold, further determining whether the outdoor coil temperature reaches a preset defrost 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, namely defrosting is performed, the branch electronic expansion valve is controlled to be in an opening state according to the 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, the main electronic expansion valve and the front filter and the rear filter thereof are used for heating when defrosting and defrosting are switched and heated, oil blockage is prevented, and therefore the oil blockage phenomenon generated in the low-temperature heating or defrosting and switching and 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, judging whether the temperature after the valve of the main electronic expansion valve reaches a preset third pour point temperature threshold value or not; if the temperature behind the valve of the main electronic expansion valve reaches the third pour point temperature threshold value, the engine lubricating oil is about to be condensed and is about to be blocked, the branch electronic expansion is controlled to be in an opening state with 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 the heat is transferred to the main electronic expansion valve and two filters connected to the two ends of the main electronic expansion valve, so that the main electronic expansion valve and the two filters connected to the two ends of the main electronic expansion valve are heated, and thus the oil blocking 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. If the post valve temperature of the main electronic expansion valve does not reach the third pour point temperature threshold, the engine lubricating oil is considered to be condensed, namely oil blockage is generated, and the branch electronic expansion valve is controlled to execute a second preset action, wherein the second preset action comprises: the bypass electronic expansion valve is opened at a preset opening degree, the opening degree is gradually increased according to the preset opening degree increasing amount, the bypass electronic expansion valve is controlled to be closed until the temperature behind the valve of the main electronic expansion valve reaches the preset fourth pour point temperature with higher temperature, the engine lubricating oil temperature is considered to be higher, oil blockage cannot occur, the bypass 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, thereby avoiding the waste of the refrigerant flow. Therefore, oil blocking prevention protection in the defrosting, switching and heating processes of the air conditioner is completed. In a specific embodiment, the preset opening increment is, for example, the frequency of M steps per minute, that is, the bypass electronic expansion valve is controlled to be opened at the preset opening, and the valve opening is continuously increased according to the frequency of M steps per minute, until the temperature after the valve of the main electronic expansion valve reaches the preset fourth pour point temperature threshold with higher temperature, and the bypass electronic expansion valve is controlled to be closed. Wherein M is a preset step length.
In one embodiment of the present invention, the oil blocking prevention control method of an air conditioner further includes: when the temperature of the outdoor coil reaches the defrosting temperature threshold, the branch electronic expansion valve is controlled to be in an open state according to the preset opening.
Specifically, when the temperature of the outdoor coil reaches the defrosting temperature threshold under the low-temperature working condition, the air conditioner is not in a defrosting mode, and the air conditioner is not defrosted at the moment, and is in heating operation, the control branch electronic expansion valve is in an opening state with a preset opening degree so that the refrigerant flows into the branch exhaust pipe, so that the heat storage and heat preservation module stores the heat of the refrigerant flowing through the branch exhaust pipe, and the heat is transferred to the main electronic expansion valve and 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, thereby effectively preventing and improving the oil blocking phenomenon generated in the low-temperature heating or defrosting switching heating process of the refrigerant, and further improving the reliability and safety of the operation of the air conditioner.
In one embodiment of the present invention, the oil blocking prevention control method of an air conditioner further includes: and when the air conditioner is determined to be in a non-heating operation, the control branch electronic expansion valve is in a closed state.
Specifically, when the air conditioner is not in heating operation and is not in defrosting mode at the moment under the low-temperature working condition, the compressor lubricating oil is considered not to be blocked, the control branch electronic expansion valve is 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, thereby avoiding the waste of refrigerant flow.
In one embodiment of the invention, the heat storage and insulation module is arranged at the back bending position of the branch exhaust pipe, so that the liquid return phenomenon is prevented, and the running reliability and safety of the air conditioner are improved. Further, the heat storage and insulation module can be specifically arranged at the second return bend of the branch exhaust pipe.
It should be noted that, when the oil blocking prevention control method for an air conditioner according to the above embodiment of the present invention is used for oil blocking prevention control, its specific implementation manner is similar to that of the air conditioner described in any one of the above embodiments of the present invention, so that the specific implementation process of the oil blocking prevention control method for an air conditioner can be referred to the above description about the air conditioner part, and for redundancy reduction, the description is omitted here.
According to the oil blockage prevention control method for the air conditioner, through designing the branch exhaust pipe of the exhaust pipeline of the compressor and the heat storage and heat preservation module positioned on the branch exhaust pipe, one heat source is independently led out to heat the heat storage and heat preservation module, when the main electronic expansion valve and the filters in front and behind the main electronic expansion valve are blocked with oil in the low-temperature heating starting and defrosting switching process of the air conditioner, the exhaust temperature of the compressor is higher and higher, heat brought by the exhaust temperature is stored into the heat storage and heat preservation module through controlling the branch electronic expansion valve on the branch exhaust pipe, and then the heat is transferred into the main electronic expansion valve wrapped in the heat storage and heat preservation module and the filters in front and behind the main electronic expansion valve, so that the main electronic expansion valve and the filters in front and behind the main electronic expansion valve are melted and prevented from being blocked with oil. The method comprises the steps of utilizing the exhaust temperature to balance the problem of oil blockage after a main electronic expansion valve is started in a low-temperature heating process and in a defrosting process, utilizing the principle that the serious exhaust temperature is higher when the oil blockage is generated, correcting the degree of the oil blockage, preventing adverse effects caused by the oil blockage, opening a branch electronic expansion valve on a branch exhaust pipe in the low-temperature heating start and defrosting switching process, enabling part of high-temperature refrigerant in the exhaust pipe to enter the branch exhaust pipe, enabling the branch exhaust pipe to be close to the main electronic expansion valve on a main flow path, coating a heat storage and insulation module outside the branch exhaust pipe, preventing heat loss, and transmitting heat to the main electronic expansion valve to heat the heat storage and insulation module after the high-temperature refrigerant in the branch exhaust pipe is used for heating the heat storage and insulation module, so that 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 safety of air conditioner operation are improved.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. An air conditioner, comprising:
the refrigerating system is used for exchanging the positions of the air suction pipe and the air discharge pipe in the refrigerating circulation loop so as to heat indoor air by utilizing the evaporator to realize heating operation of the air conditioner, and comprises a compressor which is used for compressing low-temperature low-pressure refrigerant gas into high-temperature high-pressure refrigerant gas and discharging the high-temperature high-pressure refrigerant gas to the condenser;
The refrigeration cycle loop is used for enabling a refrigerant to circulate in a loop formed by 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, which is 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 valve back temperature sensor is arranged at one end of the main electronic expansion valve, which is close to the compressor, and is used for detecting the valve back 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;
A controller configured to:
when the outdoor environment temperature does not reach the environmental temperature threshold, the branch electronic expansion valve is controlled to be in an open state at a preset opening degree, so that the heat storage and insulation module stores heat of a refrigerant flowing through the branch exhaust pipe, the heat is transferred to the main electronic expansion valve and two filters connected to two ends of the main electronic expansion valve, the main electronic expansion valve and the two filters connected to two ends of the main electronic expansion valve are heated, and when the outdoor environment temperature reaches the environmental temperature threshold, the branch electronic expansion valve is controlled to be closed.
2. The air conditioner of claim 1, 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 after the valve of the main electronic expansion valve reaches a preset first pour point temperature threshold value or not;
if the valve post temperature of the main electronic expansion valve reaches the first pour point temperature threshold, controlling the branch electronic expansion to be in an opening state according to 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: and the branch electronic expansion valve is opened according to the preset opening degree, and the opening degree is gradually increased according to the preset opening degree increment until the valve back temperature of the main electronic expansion valve reaches a preset second pour point temperature threshold value, and the branch electronic expansion valve is controlled to be closed, wherein the second pour point temperature threshold value is larger than the first pour point temperature threshold value.
3. The air conditioner of claim 1, 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 defrosting temperature outdoor coil does not reach the defrosting temperature threshold, controlling the branch electronic expansion valve to be in an open state according to a preset opening degree, and further judging whether the temperature after the valve of the main electronic expansion valve reaches a preset third pour point temperature threshold or not;
if the valve back temperature of the main electronic expansion valve reaches the third pour point temperature threshold value, controlling the branch electronic expansion to be in an opening state according to 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 according to the preset opening degree, and the opening degree is gradually increased according to the preset opening degree increment until the temperature behind the main electronic expansion valve reaches a preset fourth pour point temperature, and the branch electronic expansion valve is controlled to be closed, wherein the fourth pour point temperature is larger than the third pour point temperature.
4. The air conditioner of claim 3, wherein the controller is further configured to:
and when the temperature of the outdoor coil reaches the defrosting temperature threshold, controlling the bypass electronic expansion valve to be in an opening state according to a preset opening degree.
5. The air conditioner of claim 1, wherein the controller is further configured to:
and when the air conditioner is determined to be in a non-heating operation, controlling the branch electronic expansion valve to be in a closed state.
6. The air conditioner of claim 1, wherein the heat storage and insulation module is disposed at a return bend of the branch exhaust duct.
7. The oil blocking prevention control method of an air conditioner as set forth in claim 1, comprising the steps of:
acquiring the running state and the outdoor environment temperature of the air conditioner, and the valve back temperature of the rear end of a main electronic expansion valve in a refrigeration cycle loop and the outdoor coil temperature of an outdoor heat exchanger;
when the air conditioner is determined to be started and the heating operation is performed, judging whether the outdoor environment temperature reaches a preset environment temperature threshold value or not;
when the outdoor ambient temperature does not reach the ambient temperature threshold, controlling the branch electronic expansion valve to be in an opening state according to a preset opening degree, so that a heat storage and insulation module stores heat of a refrigerant flowing through the branch electronic expansion valve and transmits the heat to the main electronic expansion valve and two filters connected to two ends of the main electronic expansion valve to heat the main electronic expansion valve and the two filters connected to two ends of the main electronic expansion valve, wherein the branch electronic expansion valve is a pipeline which is arranged in parallel with the main exhaust pipe, two ends of the main exhaust pipe are respectively communicated with a compressor exhaust end and a four-way valve, the branch exhaust pipe is arranged adjacent 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 two ends of the main electronic expansion valve;
And when the outdoor environment temperature reaches the environment temperature threshold, controlling the bypass electronic expansion valve to be closed.
8. The oil blocking prevention control method of an air conditioner according to claim 7, further comprising, after determining that the outdoor ambient temperature does not reach the ambient temperature threshold:
judging whether the temperature after the valve of the main electronic expansion valve reaches a preset first pour point temperature threshold value or not;
if the valve post temperature of the main electronic expansion valve reaches the first pour point temperature threshold, controlling the branch electronic expansion to be in an opening state according to 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: and the branch electronic expansion valve is opened according to the preset opening degree, and the opening degree is gradually increased according to the preset opening degree increment until the valve back temperature of the main electronic expansion valve reaches a preset second pour point temperature threshold value, and the branch electronic expansion valve is controlled to be closed, wherein the second pour point temperature threshold value is larger than the first pour point temperature threshold value.
9. The oil blocking prevention control method of an air conditioner according to claim 7, 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, controlling the branch electronic expansion valve to be in an opening state according to a preset opening degree, and further judging whether the temperature after the valve of the main electronic expansion valve reaches a preset third pour point temperature threshold or not;
if the valve back temperature of the main electronic expansion valve reaches the third pour point temperature threshold value, controlling the branch electronic expansion to be in an opening state according to 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 according to the preset opening degree, and the opening degree is gradually increased according to the preset opening degree increment until the temperature behind the main electronic expansion valve reaches a preset fourth pour point temperature, and the branch electronic expansion valve is controlled to be closed, wherein the fourth pour point temperature is larger than the third pour point temperature.
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