CN113551389B - Compressor oil return control method of air conditioning system in refrigeration mode - Google Patents
Compressor oil return control method of air conditioning system in refrigeration mode Download PDFInfo
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- CN113551389B CN113551389B CN202010290911.8A CN202010290911A CN113551389B CN 113551389 B CN113551389 B CN 113551389B CN 202010290911 A CN202010290911 A CN 202010290911A CN 113551389 B CN113551389 B CN 113551389B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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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
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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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
- F25B31/00—Compressor arrangements
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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
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention relates to the technical field of air conditioning, in particular to a compressor oil return control method of an air conditioning system in a refrigeration mode. The invention aims to solve the problem of poor effect of the existing compressor oil return control method. To this end, the oil return control method of the compressor of the present invention comprises: when the air conditioning system operates in a refrigeration mode, acquiring the outdoor environment temperature; comparing the outdoor ambient temperature with the outdoor temperature threshold value; when the outdoor environment temperature is greater than or equal to the outdoor temperature threshold value, acquiring the indoor environment temperature, the indoor coil temperature and the rotating speed of the inner fan; calculating an indoor temperature difference based on the indoor ambient temperature and the indoor coil temperature; determining the target opening degree of the second throttling element based on the indoor temperature difference and the rotating speed of the inner fan; and controlling the opening degree of the second throttling element to be adjusted to the target opening degree. The control method can keep the oil return amount of the compressor in a better state, and ensures that the compressor runs efficiently and stably.
Description
Technical Field
The invention relates to the technical field of air conditioning, in particular to a compressor oil return control method of an air conditioning system in a refrigeration mode.
Background
The compressor is the core component of the air conditioning system, and the operation performance of the compressor directly influences the operation effect of the air conditioning system. The compressor is filled with refrigerating machine oil which plays a role in lubricating and cooling a motor and parts when the compressor works; in the refrigerant circulation process of the air conditioning system, the refrigerating machine oil flows into the heat exchangers of the internal machine and the external machine along with the refrigerant, the machine oil can obstruct the heat exchange between the refrigerant and the outside, the thermal resistance is increased, and the capacity and the power of the air conditioning system are reduced and increased. Therefore, the oil quantity of a refrigerating machine of the compressor is important to control, if the oil quantity is too small, the lubricating and cooling effects cannot be achieved, and the oil return of the system is difficult, so that parts are abraded; if too much oil quantity hinders the circulation of the system, the circulation efficiency of the system is reduced, and the energy efficiency level is influenced.
Research shows that the viscosity of the refrigerating machine oil is related to the temperature, the temperature is high, the viscosity of the refrigerating machine oil is low, the fluidity is good, and the oil return speed is high, otherwise, the fluidity is poor, and the oil return speed is low. Therefore, how to perform efficient and stable oil return control based on temperature is an urgent problem to be solved in the field.
Accordingly, there is a need in the art for a new method for controlling oil return to a compressor of an air conditioning system in a cooling mode to solve the above-mentioned problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem of poor effect of the existing oil return control method for the compressor, the present invention provides a method for controlling oil return of a compressor of an air conditioning system in a refrigeration mode, wherein the air conditioning system comprises a compressor, an outdoor heat exchanger, a first throttling element, an indoor heat exchanger and an oil controller, the oil controller comprises a shell, an inlet pipe, an outlet pipe and an oil return pipe, the inlet pipe, the outlet pipe and the oil return pipe are arranged on the shell, the oil return pipe is communicated with an air suction port of the compressor, a second throttling element is arranged between the oil return pipe and the air suction port,
the oil return control method for the compressor comprises the following steps:
when the air conditioning system operates in a refrigeration mode, acquiring the outdoor environment temperature;
comparing the outdoor environment temperature with an outdoor temperature threshold value;
when the outdoor environment temperature is greater than or equal to the outdoor temperature threshold value, acquiring the indoor environment temperature, the indoor coil temperature and the rotating speed of the inner fan;
calculating an indoor temperature difference based on the indoor ambient temperature and the indoor coil temperature;
determining a target opening degree of the second throttling element based on the indoor temperature difference and the rotating speed of the inner fan;
and controlling the opening degree of the second throttling element to be adjusted to the target opening degree.
In a preferred embodiment of the method for controlling oil return to the compressor of the air conditioning system in the cooling mode, "determining the target opening of the second throttling element based on the indoor temperature difference and the rotation speed of the inner fan" further includes:
comparing the indoor temperature difference with an indoor temperature difference threshold value, and comparing the rotating speed of the inner fan with a rotating speed threshold value;
based on the comparison, a target opening of the second throttling element is determined.
In a preferable embodiment of the method for controlling oil return to the compressor of the air conditioning system in the cooling mode, the step of determining the target opening degree of the second throttling element based on the comparison result further includes:
and when the rotating speed of the inner fan is greater than or equal to the rotating speed threshold value, calculating the target opening degree of the second throttling element based on a first fitting formula.
In a preferred embodiment of the method for controlling oil return of the compressor of the air conditioning system in the cooling mode, the first fitting formula is determined based on a correspondence between the indoor temperature difference and the rotational speed of the inner fan and the target opening degree.
In an preferable technical solution of the oil return control method for the compressor of the air conditioning system in the above refrigeration mode, the first fitting formula is:
B＝a 1 ΔT in +b 1 r
wherein B is a target opening degree of the second throttling element; the Delta T in The indoor temperature difference is obtained, and the r is the rotating speed of the inner fan; a is a 1 、b 1 Is a constant.
In a preferred embodiment of the method for controlling oil return to the compressor of the air conditioning system in the cooling mode, the step of determining the target opening degree of the second throttling element based on the comparison result further includes:
and when the indoor temperature difference is smaller than the indoor temperature difference threshold value and the rotating speed of the inner fan is smaller than the rotating speed threshold value, calculating the target opening degree of the second throttling element based on a second fitting formula.
In a preferable embodiment of the oil return control method for the compressor of the air conditioning system in the cooling mode, the second fitting formula is determined by adding a correction opening degree to the first fitting formula.
In a preferable technical solution of the oil return control method for the compressor of the air conditioning system in the refrigeration mode, the oil return control method for the compressor further includes:
when the outdoor environment temperature is smaller than the outdoor temperature threshold value, calculating a target opening degree of the second throttling element based on a third fitting formula;
in a preferable embodiment of the oil return control method for the compressor of the air conditioning system in the cooling mode, the third fitting formula is determined based on a corresponding relationship between the outdoor ambient temperature, the operating frequency of the compressor, and the reference opening degree of the second throttling element and the target opening degree.
In the preferable technical solution of the oil return control method for the compressor of the air conditioning system in the refrigeration mode, the third fitting formula is as follows:
B＝a 2 (35-T out )+(b 2 /f)B 0 +B 0
wherein B is a target opening degree of the second throttling element; said T is out Is the outdoor ambient temperature, said f is the operating frequency of said compressor; b is 0 A reference opening degree of the second throttling element; a is a mentioned 2 、b 2 Is a constant.
As can be understood by those skilled in the art, in a preferred embodiment of the present invention, an air conditioning system includes a compressor, an outdoor heat exchanger, a first throttling element, an indoor heat exchanger, and an oil controller, where the oil controller includes a casing, and an inlet pipe, an outlet pipe, and an oil return pipe that are disposed in the casing, the oil return pipe is communicated with a suction port of the compressor, a second throttling element is disposed between the oil return pipe and the suction port, and a compressor oil return control method of the air conditioning system in a cooling mode includes: when the air conditioning system operates in a refrigeration mode, acquiring the outdoor environment temperature; comparing the outdoor environment temperature with the outdoor temperature threshold value; when the outdoor environment temperature is greater than or equal to the outdoor temperature threshold value, acquiring the indoor environment temperature, the indoor coil temperature and the rotating speed of the inner fan; calculating an indoor temperature difference based on the indoor ambient temperature and the indoor coil temperature; determining the target opening degree of the second throttling element based on the indoor temperature difference and the rotating speed of the inner fan; and controlling the opening degree of the second throttling element to be adjusted to the target opening degree.
Through the control mode, the control method can jointly determine the target opening degree of the second throttling element adaptive to the current indoor and outdoor environments based on the indoor temperature difference and the rotating speed of the inner fan in the refrigeration mode, so that the second throttling element is adjusted based on the target opening degree, the oil return amount of the compressor reaches a better level, and the compressor is guaranteed to run efficiently and stably. Specifically, when the refrigeration mode is operated, if the outdoor environment temperature is high, the viscosity of the refrigerating machine oil in the outdoor heat exchanger is low, and the fluidity is good, so that the opening degree of the second throttling element does not need to be controlled based on the outdoor unit. At the moment, the state of the refrigerating machine oil in the indoor heat exchanger is judged based on the indoor temperature difference and the rotating speed of the inner fan, when the indoor temperature difference is large and the rotating speed of the inner fan is high, the refrigerating machine oil in the indoor heat exchanger is low in viscosity and good in flowability, and otherwise, the flowability is poor. Therefore, the target opening of the second quarter throttling element can be adjusted based on the indoor temperature difference and the rotating speed parameter of the inner fan, so that the oil return amount of the compressor reaches the better value of the current indoor and outdoor environmental conditions, the compressor is guaranteed to run efficiently and stably, and the energy efficiency level of the air conditioning system is improved.
Further, when the outdoor environment temperature is low, it is proved that the air conditioning system may operate in a low-temperature refrigeration or base station temperature control scene, the indoor environment temperature is basically unchanged, the temperature change of the indoor heat exchanger is not large, and the main influence factor of the oil return effect of the air conditioner is the outdoor environment temperature. At the moment, the opening degree of the second throttling element is determined based on the outdoor environment temperature, the running frequency of the compressor and the reference opening degree of the second throttling element, so that the oil return effect of the compressor can be matched with the current outdoor environment, and the efficient and stable running of the compressor is ensured.
Drawings
The compressor oil return control method of the air conditioning system in the cooling mode according to the present invention will be described with reference to the accompanying drawings. In the drawings:
FIG. 1 is a system schematic of an air conditioning system of the present invention;
FIG. 2 is a flow chart of a method for controlling oil return to a compressor of an air conditioning system in a cooling mode according to the present invention;
fig. 3 is a logic diagram of one possible embodiment of a method for controlling oil return of a compressor of an air conditioning system in a cooling mode according to the present invention.
List of reference numerals
1. A compressor; 2. a four-way valve; 3. an outdoor heat exchanger; 4. a first throttling element; 5. a bridge rectifier circuit; 6. an oil controller; 61. an inlet pipe; 62. an outlet pipe; 63. an oil return pipe; 7. an indoor heat exchanger; 8. a second throttling element.
Detailed Description
It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the steps of the method of the present invention are described in detail below, those skilled in the art can combine, disassemble and change the sequence of the above steps without departing from the basic principle of the present invention, and the modified technical solution does not change the basic concept of the present invention and therefore falls into the protection scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
First, referring to fig. 1, the structure of the air conditioning system of the present invention will be described.
As shown in fig. 1, fig. 1 is a system diagram of an air conditioning system, which includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a first throttling element 4, a bridge rectifier circuit 5, an oil controller 6, an indoor heat exchanger 7, and a second throttling element 8. The oil controller 6 comprises a shell, and an inlet pipe 61, an outlet pipe 62 and an oil return pipe 63 which are arranged on the shell, wherein the inlet pipe 61 extends from the top of the shell, the outlet pipe 62 and the oil return pipe 63 both extend from the bottom of the shell, and the extending height of the outlet pipe 62 is greater than that of the oil return pipe 63. The bridge type rectifying pipeline 5 is of a bridge type structure formed by four pipelines, and each pipeline is provided with a one-way valve (5 a-5 d). In this application, the first throttling element 4 is an electronic expansion valve, and the second throttling element 8 may be an electronic expansion valve or an electromagnetic valve with a controllable opening degree.
Referring to fig. 1, in the air conditioning system, in the cooling mode, an exhaust port of a compressor 1 is communicated with an inlet of an outdoor heat exchanger 3 through a four-way valve 2, an outlet of the outdoor heat exchanger 3 is communicated with an inlet pipe 61 of an oil controller 6 through a one-way valve 5a of a bridge rectifier pipeline 5, an outlet pipe 62 of the oil controller 6 is communicated with an inlet of a first throttling element 4, an outlet of the first throttling element 4 is communicated with an inlet of an indoor heat exchanger 7 through a one-way valve 5c, and an outlet of the indoor heat exchanger 7 is communicated with an air suction port of the compressor 1 through the four-way valve 2. An oil return pipe 63 of the oil controller 6 communicates with the suction port of the compressor 1 via the second throttling element 8.
When the air conditioning system is in refrigeration operation, gaseous refrigerant mixed with refrigerating machine oil discharged by the compressor 1 enters the outdoor heat exchanger 3 through the four-way valve 2 and is liquefied into liquid refrigerant, and the liquid refrigerant enters the shell of the oil controller 6 through the one-way valve 5a and the inlet pipe 61. The liquid refrigerant entering the oil controller 6 has a trace amount of flash, most of the liquid refrigerant is still in a liquid state, the refrigerator oil in the oil controller 6 can be layered with the liquid refrigerant, the refrigerator oil is arranged at the lower layer, the middle layer is the liquid refrigerant, and the upper layer is the gaseous refrigerant. The gaseous and liquid refrigerants are throttled by the outlet pipe 62 and the first throttling element 4, then enter the indoor heat exchanger 7 through the check valve 5c and are vaporized into gaseous refrigerants, and the gaseous refrigerants enter the air suction port of the compressor 1 through the four-way valve 2, so that the circulation of the refrigerants is realized. The refrigerating machine oil at the lowest layer of the oil controller 6 passes through the second throttling element 8 and then enters the air suction port of the compressor 1, so that the circulation of the refrigerating machine oil is realized.
With reference to fig. 1, in the heating mode, the exhaust port of the compressor 1 is communicated with the inlet of the indoor heat exchanger 7 through the four-way valve 2, the outlet of the indoor heat exchanger 7 is communicated with the inlet pipe 61 of the oil controller 6 through the check valve 5b of the bridge rectifier pipeline 5, the outlet pipe 62 of the oil controller 6 is communicated with the inlet of the first throttling element 4, the outlet of the first throttling element 4 is communicated with the inlet of the outdoor heat exchanger 3 through the check valve 5d, and the outlet of the outdoor heat exchanger 3 is communicated with the suction port of the compressor 1 through the four-way valve 2. An oil return pipe 63 of the oil controller 6 communicates with the suction port of the compressor 1 via the second throttling element 8.
When the air conditioning system is operated for heating, a gaseous refrigerant mixed with refrigerating machine oil discharged by the compressor 1 enters the indoor heat exchanger 7 through the four-way valve 2 and is liquefied into a liquid refrigerant, and the liquid refrigerant enters the shell of the oil controller 6 through the one-way valve 5b and the inlet pipe 61. The liquid refrigerant entering the oil controller 6 has a trace amount of flash evaporation, most of the liquid refrigerant is still in a liquid state, the refrigerator oil in the oil controller 6 can be layered with the liquid refrigerant, the refrigerator oil is arranged at the lower layer, the middle layer is the liquid refrigerant, and the upper layer is the gaseous refrigerant. The gaseous and liquid refrigerants are throttled by the outlet pipe 62 and the first throttling element 4, then enter the outdoor heat exchanger 3 through the check valve 5d and are vaporized into gaseous refrigerants, and the gaseous refrigerants enter the suction port of the compressor 1 through the four-way valve 2, so that the circulation of the refrigerants is realized. The refrigerating machine oil at the lowest layer of the oil controller 6 passes through the second throttling element 8 and then enters the air suction port of the compressor 1, so that the circulation of the refrigerating machine oil is realized.
It will be understood by those skilled in the art that although the air conditioning system of the present application has been described with reference to the above specific configurations, it is not intended to limit the scope of the present application, and those skilled in the art may add or delete one or more components or adjust the positions of one or more components without departing from the principles of the present application. For example, the oil controller 6 may be replaced by another structure in the prior art, and the position of the oil controller may be between the rotary compressor 1 and the outdoor heat exchanger 3. For another example, the four-way valve 2 may not be provided in the air conditioning system, and accordingly, two pipelines need to be omitted from the bridge rectifier pipeline 5.
The method for controlling oil return of the compressor of the air conditioning system in the cooling mode according to the present invention will be described with reference to fig. 2 and 3.
As described in the background, prior studies have shown that the viscosity of refrigerator oils is primarily temperature dependent. The temperature is high, the viscosity of the refrigerating machine oil is low, the fluidity is good, and the oil return speed is high, otherwise, the fluidity is poor, and the oil return speed is low. Therefore, how to perform efficient and stable oil return control based on temperature is an urgent problem to be solved in the field. In order to solve the above problems, the oil return control method for the compressor of the air conditioning system in the refrigeration mode mainly comprises the following steps:
s100, when the air conditioning system operates in a refrigeration mode, acquiring outdoor environment temperature; for example, when the air conditioning system is turned on and operates in the cooling mode, the outdoor ambient temperature is obtained by a temperature sensor provided in the outdoor unit.
S200, comparing the outdoor environment temperature with the outdoor temperature threshold value; for example, the outdoor temperature threshold is stored in advance in a controller of the air conditioner, and after the outdoor ambient temperature is acquired, the outdoor ambient temperature is compared with the outdoor temperature threshold.
S300, when the outdoor environment temperature is larger than or equal to the outdoor temperature threshold, acquiring the indoor environment temperature, the indoor coil temperature and the rotating speed of an inner fan; for example, when the comparison result shows that the outdoor ambient temperature is equal to or higher than the outdoor temperature threshold, it is proved that the refrigerating machine oil in the outdoor heat exchanger has good fluidity at this time, and the opening degree of the second throttling element does not need to be controlled based on the outdoor ambient temperature; at the moment, the indoor environment temperature is obtained through a temperature sensor arranged on the indoor unit, the indoor coil temperature is obtained through a temperature sensor arranged on the indoor heat exchanger, and the rotating speed of the inner fan is obtained through a speed sensor arranged on the fan or through reading the operating parameters of the air conditioning system.
S400, calculating an indoor temperature difference based on the indoor environment temperature and the indoor coil temperature; for example, after the indoor ambient temperature and the indoor coil temperature are acquired, the difference between the indoor ambient temperature and the indoor coil temperature is calculated as the indoor temperature difference.
S500, determining the target opening degree of the second throttling element based on the indoor temperature difference and the rotating speed of the inner fan; for example, after the indoor temperature difference is calculated, the opening degree of the second throttling element is determined based on a comparison table between the indoor temperature difference and the target opening degree of the inner fan and the second throttling element; or after the indoor temperature difference is calculated, the opening degree of the second throttling element is determined based on a fitting formula between the indoor temperature difference and the rotating speed of the inner fan as well as the target opening degree.
S600, controlling the opening degree of the second throttling element to be adjusted to a target opening degree; for example, after the target opening degree of the second throttling element is determined, the second throttling element is controlled to adjust to the target opening degree.
As can be seen from the above description, the control method of the present application can determine the target opening degree of the second throttling element adapted to the current indoor and outdoor environments based on the indoor temperature difference and the rotation speed of the inner fan in the refrigeration mode, so as to adjust the second throttling element based on the target opening degree, so that the oil return amount of the compressor reaches a better level, and the compressor is ensured to operate efficiently and stably.
Specifically, when the cooling mode is operated, if the outdoor environment temperature is high (for example, higher than 16 ℃), the viscosity of the refrigerating machine oil in the outdoor heat exchanger is low, and the fluidity is good, so that the opening degree of the second throttling element does not need to be controlled based on the outdoor unit. At the moment, the state of the refrigerating machine oil in the indoor heat exchanger is judged based on the indoor temperature difference and the rotating speed of the inner fan, when the indoor temperature difference is large and the rotating speed of the inner fan is high, the viscosity of the refrigerating machine oil in the indoor heat exchanger is small, the flowability is good, and otherwise, the flowability is poor. Therefore, the target opening of the second-season throttling element can be adjusted based on the indoor temperature difference and the rotating speed parameter of the inner fan, so that the oil return amount of the compressor reaches the optimal value of the current indoor and outdoor environmental conditions, the compressor is guaranteed to run efficiently and stably, and the energy efficiency level of an air conditioning system is improved.
A preferred embodiment of the oil return control method for the compressor of the air conditioning system in the cooling mode according to the present application will be described below.
In a preferred embodiment, step S500 further includes: comparing the indoor temperature difference with an indoor temperature difference threshold value, and comparing the rotating speed of the inner fan with a rotating speed threshold value; based on the comparison, a target opening of the second throttling element is determined. Specifically, when the rotating speed of the inner fan is greater than or equal to a rotating speed threshold value, calculating the target opening degree of the second throttling element based on a first fitting formula; the first fitting formula is determined based on the corresponding relation between the indoor temperature difference and the rotating speed and the target opening degree of the inner fan. When the indoor temperature difference is smaller than the indoor temperature difference threshold value and the rotating speed of the inner fan is smaller than the rotating speed threshold value, calculating the target opening degree of the second throttling element based on a second fitting formula; wherein the second fitting formula is determined by adding a correction opening degree on the basis of the first fitting formula.
For example, when the rotating speed of the inner fan is greater than or equal to the rotating speed threshold, the rotating speed of the inner fan is proved to be higher at the moment, the heat exchange quantity of the indoor heat exchanger is also proved to be large at the moment, the viscosity of the refrigerating machine oil in the indoor heat exchanger is smaller, and the flowability is better, so that the target opening degree of the second throttling element can be adjusted in the same control mode no matter what state the indoor temperature difference is, and the oil return quantity of the compressor is ensured. On the contrary, when the rotating speed of the inner fan is smaller than the rotating speed threshold value, the rotating speed of the inner fan is lower, the temperature of the indoor coil is lower, and if the indoor temperature difference is smaller than the indoor temperature difference threshold value, the heat exchange amount of the indoor heat exchanger is small, the viscosity of the refrigerating machine oil is high, and the mobility is poor.
For example, in a preferred embodiment, the first fitting equation and the second fitting equation are:
B＝a 1 ΔT in +b 1 r (1)
B＝a 1 ΔT in +b 1 r+B 1 (2)
in the formula (1) and the formula (2), B is a target opening degree of the second throttling element; delta T in The indoor temperature difference is adopted, and r is the rotating speed of the inner fan; b 1 To correct the opening; a is a 1 、b 1 Is a constant.
The above equation (1) can be determined as follows: the method comprises the steps of controlling the compressor to work under the working conditions of multiple groups of different indoor temperature differences and rotating speeds of the inner fan respectively, recording parameters such as power and energy consumption of the compressor by adjusting the opening degree of the second throttling element under each group of working conditions, and recording the opening degree of the second throttling element in the state as the standard opening degree of the second throttling element under the working conditions when the power and the energy consumption of the compressor reach the better state. And after the test is finished, classifying and fitting the multiple groups of data, and finally fitting to obtain a formula of the target opening degree.
The formula (2) can obtain the standard opening degree of the second throttling element under different working conditions in the same experimental mode on the basis of the formula (1), and finally, the formula (2) is compared with the formula (1) to obtain the corrected opening degree.
It can be seen from the above formula (1) and formula (2) that when the rotation speed of the internal fan is high, the target opening of the second throttling element is determined by the formula (1) fitted based on the indoor temperature difference and the rotation speed of the internal fan, so that the oil return amount of the compressor in the operation process can be matched with the current indoor and outdoor environment, and the efficient and stable operation of the compressor is ensured. When the indoor temperature difference is small and the rotating speed of the inner fan is low, the formula (1) is corrected to obtain the formula (2) to control the target opening degree of the second throttling element, so that the oil return amount of the compressor can be improved by increasing the opening degree of the second throttling element when the mobility of refrigerating machine oil of the indoor heat exchanger is poor, and the running efficiency of the compressor is ensured.
In another preferred embodiment, the oil return control method for a compressor further includes: when the outdoor environment temperature is smaller than the outdoor temperature threshold value, calculating the target opening degree of the second throttling element based on a third fitting formula; wherein the third fitting formula is determined based on the outdoor ambient temperature, the operating frequency of the compressor, and the correspondence between the reference opening degree and the target opening degree of the second throttling element. Specifically, in the present application, the third fitting equation is:
B＝a 2 (35-T out )+(b 2 /f)B 0 +B 0 (3)
in the formula (3), B is the target opening degree of the second throttling element; t is a unit of out Is the outdoor ambient temperature, f is the operating frequency of the compressor; b 0 A reference opening degree of the second throttling element; a is 2 、b 2 Is a constant. The determination of equation (3) is similar to equation (1) above and will not be described again.
For example, when the outdoor environment temperature is low (e.g., lower than 16 ℃), it is proved that the air conditioning system may be operated in a low-temperature refrigeration or base station temperature control scene, the indoor environment temperature is basically unchanged, the temperature change of the indoor heat exchanger is not large, and the main influence factor of the oil return effect of the air conditioner is the outdoor environment temperature. At the moment, the opening degree of the second throttling element is determined based on the outdoor environment temperature, the running frequency of the compressor and the reference opening degree of the second throttling element, so that the oil return effect of the compressor can be matched with the current outdoor environment, and the efficient and stable running of the compressor is ensured.
It should be noted that although specific values are not given for the outdoor temperature threshold, the indoor temperature difference threshold, the rotation speed threshold, etc., this is not a lack of disclosure, and on the contrary, a person skilled in the art may set the above parameters based on a specific application scenario of the air conditioning system, so that the present control method can better exert its effects.
One possible implementation of the control method of the present invention is described below with reference to fig. 3. Fig. 3 is a logic diagram of an oil return control method for a compressor of an air conditioning system in a refrigeration mode according to the present invention.
As shown in fig. 3, in a possible embodiment, after the air conditioner is started, step S10 is first executed: acquiring operation mode → after acquiring operation mode, step S20 is executed: judging whether the operation is currently performed in the cooling mode → if so, executing the step S21: obtaining outdoor ambient temperature T out → acquisition of outdoor ambient temperature T out Then, step S30 is executed: comparing outdoor ambient temperature T out And outdoor temperature threshold T 1 Size of → when T out ≥T 1 If not, step S31 is executed: determining and controlling the target opening degree of the second throttling element according to the formula (3)Make the second throttling element adjust to the target opening → otherwise, if T out ≥T 1 If true, go to step S40: further comparing the indoor temperature difference Delta T in Threshold value T of temperature difference with indoor 2 The rotating speed R of the inner fan and the rotating speed threshold value R → time delta T in ＜T 2 And R < R, then executing step S41: determining a target opening of the second throttling element according to the formula (2) and controlling the second throttling element to adjust to the target opening → otherwise, when Δ T in ＜T 2 And R < R is not satisfied, executing step S50: if R ≧ R is satisfied → R is satisfied, go to step S51: determining the target opening degree of the second throttling element according to the formula (1) and controlling the second throttling element to adjust to the target opening degree → when the judgment result of the step S20 or the step S50 is NO, ending the program and keeping the current operation state of the air conditioning system unchanged.
It should be noted that the controller for executing the control method may be a controller dedicated to execute the method of the present invention, a controller of an existing air conditioning system, or a functional module or functional unit of a general controller.
It will be understood by those skilled in the art that although the specific structure of the controller is not illustrated in the above embodiments, the controller of the air conditioning system may also include other known structures, such as a processor, a memory, and the like, wherein the memory includes, but is not limited to, a random access memory, a flash memory, a read only memory, a programmable read only memory, a volatile memory, a non-volatile memory, a serial memory, a parallel memory, or a register, and the like, and the processor includes, but is not limited to, a CPLD/FPGA, a DSP, an ARM processor, a MIPS processor, and the like. Such well-known structures are not shown in the drawings in order to not unnecessarily obscure embodiments of the present disclosure.
In addition, although the foregoing embodiments describe the steps in the above sequential order, those skilled in the art can understand that, in order to achieve the effect of the present embodiment, different steps need not be executed in such an order, and they may be executed simultaneously (in parallel) or in reverse order, and these simple changes are within the scope of the present invention. For example, the step of obtaining the rotation speed of the inner fan may be performed simultaneously with the indoor ambient temperature and the indoor coil temperature, or may be performed after calculating the indoor temperature difference.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is apparent to those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (4)
1. A compressor oil return control method of an air conditioning system in a refrigeration mode is characterized in that the air conditioning system comprises a compressor, an outdoor heat exchanger, a first throttling element, an indoor heat exchanger and an oil controller, the oil controller comprises a shell, an inlet pipe, an outlet pipe and an oil return pipe, the inlet pipe, the outlet pipe and the oil return pipe are arranged on the shell, the oil return pipe is communicated with an air suction port of the compressor, a second throttling element is arranged between the oil return pipe and the air suction port, wherein in the refrigeration mode of the air conditioning system, the inlet pipe is communicated with an outlet of the outdoor heat exchanger, the outlet pipe is communicated with an inlet of the indoor heat exchanger, the first throttling element is arranged between the outlet pipe and an inlet of the indoor heat exchanger,
the oil return control method for the compressor comprises the following steps:
when the air conditioning system operates in a refrigeration mode, acquiring the outdoor environment temperature;
comparing the outdoor environment temperature with an outdoor temperature threshold value;
when the outdoor environment temperature is greater than or equal to the outdoor temperature threshold value, acquiring the indoor environment temperature, the indoor coil temperature and the rotating speed of the inner fan;
calculating an indoor temperature difference based on the indoor ambient temperature and the indoor coil temperature;
determining a target opening degree of the second throttling element based on the indoor temperature difference and the rotating speed of the inner fan;
controlling the opening degree of the second throttling element to be adjusted to the target opening degree;
the step of determining the target opening degree of the second throttling element based on the indoor temperature difference and the rotation speed of the inner fan further comprises:
comparing the indoor temperature difference with an indoor temperature difference threshold value, and comparing the rotating speed of the inner fan with a rotating speed threshold value;
determining a target opening degree of the second throttling element based on the comparison result;
the step of "determining the target opening degree of the second throttling element based on the comparison result" further includes:
when the rotating speed of the inner fan is larger than or equal to a rotating speed threshold value, calculating the target opening degree of the second throttling element based on a first fitting formula;
the first fitting formula is determined based on the corresponding relation between the indoor temperature difference and the rotating speed of the inner fan and the target opening degree;
the first fitting equation is:
B=a
1
△T
in
+b
1
r
wherein, theBA target opening of the second throttling element; the described△T in For the indoor temperature difference, therThe rotating speed of the inner fan is set; the describeda 1 、b 1 Is a constant.
2. The method as claimed in claim 1, wherein the step of determining the target opening degree of the second throttling element based on the comparison further comprises:
when the indoor temperature difference is smaller than the indoor temperature difference threshold value and the rotating speed of the inner fan is smaller than the rotating speed threshold value, calculating the target opening degree of the second throttling element based on a second fitting formula;
the second fitting formula is determined by adding a correction opening degree on the basis of the first fitting formula.
3. The method as claimed in claim 2, wherein the second fitting formula is:
B=a
1
△T
in
+b
1
r+B
1
wherein, theBA target opening of the second throttling element; the above-mentioned△T in For the indoor temperature difference, therThe rotating speed of the inner fan is set; the above-mentionedB 1 To correct the opening; the describeda 1 、b 1 Is a constant.
4. The compressor oil return control method of an air conditioning system in a cooling mode according to claim 1, further comprising:
when the outdoor environment temperature is smaller than the outdoor temperature threshold value, calculating a target opening degree of the second throttling element based on a third fitting formula;
the third fitting equation is:
B=a 2 (35-T out )+(b 2 / f )B 0 +B 0
wherein, theBA target opening of the second throttling element; the describedT out Is outdoorsAmbient temperature of saidfIs the operating frequency of the compressor; the above-mentionedB 0 A reference opening degree of the second throttling element; the describeda 2 、b 2 Is a constant.
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| CN202010290911.8A CN113551389B (en) | 2020-04-14 | 2020-04-14 | Compressor oil return control method of air conditioning system in refrigeration mode |
| PCT/CN2020/142347 WO2021208523A1 (en) | 2020-04-14 | 2020-12-31 | Oil return control method for compressor of air conditioning system in refrigeration mode |
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| CN202010290911.8A CN113551389B (en) | 2020-04-14 | 2020-04-14 | Compressor oil return control method of air conditioning system in refrigeration mode |
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| CN115264675B (en) * | 2022-04-29 | 2023-11-10 | 佛山市顺德区美的电子科技有限公司 | Air conditioner and control method thereof |
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| CN105299979B (en) * | 2015-10-15 | 2017-09-12 | 海信（山东）空调有限公司 | Compressor method for controlling oil return, oil return apparatus and air conditioner |
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