CN115200264B - Oil return control method and device and air conditioner - Google Patents

Oil return control method and device and air conditioner Download PDF

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Publication number
CN115200264B
CN115200264B CN202210795118.2A CN202210795118A CN115200264B CN 115200264 B CN115200264 B CN 115200264B CN 202210795118 A CN202210795118 A CN 202210795118A CN 115200264 B CN115200264 B CN 115200264B
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Prior art keywords
opening
oil
heat exchange
compressor
exchange capacity
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CN115200264A (en
Inventor
张仕强
陈敏
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN202210795118.2A priority Critical patent/CN115200264B/en
Publication of CN115200264A publication Critical patent/CN115200264A/en
Priority to PCT/CN2023/088752 priority patent/WO2024007676A1/en
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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
    • 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
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • 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
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/16—Lubrication
    • 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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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses an oil return control method and device and an air conditioner. Wherein the method comprises the following steps: under the current operating frequency of the compressor, the oil quantity adjusting part on the oil return pipeline is adjusted to a first opening degree, and the first opening degree is maintained to operate for a first time, so that the internal oil level of the compressor reaches the maximum safe oil level; reducing the oil quantity regulating part to a second opening degree so as to enable the oil discharge quantity of the compressor to be equal to the oil return quantity of the compressor; and determining the optimal opening according to the air conditioner heat exchange capacity, and controlling the oil quantity regulating component to continuously operate according to the optimal opening. The invention ensures reliable oil return through the first opening degree and the first time, and ensures the reliability of the compressor; on the basis of balancing the oil discharge amount of the compressor and the oil return amount of the compressor, the oil quantity adjusting part is subjected to optimizing control of less oil return, so that the optimal opening degree with higher capacity and energy efficiency is searched, the capacity and energy efficiency under the reliable oil return condition are further improved, the capacity and energy efficiency are optimal, and the reliable operation of the compressor is ensured.

Description

Oil return control method and device and air conditioner
Technical Field
The invention relates to the technical field of compressors, in particular to an oil return control method and device and an air conditioner.
Background
When the compressor of the air conditioner discharges high-temperature high-pressure gaseous refrigerant, part of lubricating oil is carried, and after the refrigerant and the oil are separated by the oil separator, the separated oil is returned to the compressor through an oil return pipeline so as to avoid oil shortage of the compressor.
In the existing oil return control method, an oil level detection module can be arranged in the oil separator to detect the change speed of the oil level in the oil separator, and the adjustment opening degree of the oil return expansion valve in the next period is judged by comparing the oil level change speed in one period with a preset value. However, providing the oil level detection module results in an increase in cost; part of the refrigerant can directly return to the air suction side of the compressor along with oil return, but does not flow to the heat exchanger, the part of refrigerant does not participate in heat exchange, and the air conditioner heat exchange capacity is affected.
There are other oil return control methods, for example, using experimental data to preset the relationship between each working frequency of the compressor and the oil flow, and by obtaining the actual working frequency of the compressor, adjusting the opening of the control valve in the oil return pipeline, so that the oil flow at the current working frequency is consistent with the preset oil flow. However, this method also has the above-described problems.
Aiming at the problem that the air conditioner oil return control method in the prior art cannot improve the heat exchange capacity of the air conditioner, no effective solution is proposed at present.
Disclosure of Invention
The embodiment of the invention provides an oil return control method and device and an air conditioner, which at least solve the problem that the air conditioner oil return control method in the prior art cannot improve the heat exchange capacity of the air conditioner.
In order to solve the above technical problems, an embodiment of the present invention provides an oil return control method, including:
under the current operating frequency of the compressor, an oil quantity adjusting part on an oil return pipeline is adjusted to a first opening degree, and the first opening degree is maintained to operate for a first time, so that the internal oil level of the compressor reaches the maximum safe oil level;
reducing the oil quantity regulating part to a second opening degree so as to ensure that the oil discharge quantity of the compressor is equal to the oil return quantity of the compressor;
and determining the optimal opening according to the heat exchange capacity of the air conditioner, and controlling the oil quantity regulating component to continuously operate according to the optimal opening.
Optionally, before the oil quantity adjusting component on the oil return pipeline is adjusted to the first opening degree, the method further includes:
obtaining current preset parameters, wherein the preset parameters comprise: compressor operating frequency, suction temperature, suction pressure, discharge temperature, and discharge pressure;
And determining a first opening degree and a first time corresponding to the current preset parameters according to first pre-stored information, wherein when the opening degree of the oil quantity adjusting component is the first opening degree, the oil discharge quantity of the compressor is smaller than the oil return quantity of the compressor.
Optionally, before the oil amount adjusting part is reduced to the second opening degree, the method further includes:
obtaining current preset parameters, wherein the preset parameters comprise: compressor operating frequency, suction temperature, suction pressure, discharge temperature, and discharge pressure;
calculating according to the current preset parameters to obtain the current oil discharge amount of the compressor;
and calculating to obtain the second opening according to the current compressor oil discharge amount, the current compressor operating frequency and the current lubricating oil temperature, wherein when the opening of the oil quantity regulating part is the second opening, the compressor oil discharge amount is equal to the compressor oil return amount, and the second opening is smaller than the first opening.
Optionally, determining the optimal opening according to the heat exchange capability of the air conditioner includes:
judging whether to execute the running stage of the optimal opening degree of the round according to the heat exchange capability of the air conditioner;
if not, determining the optimal opening according to whether an optimal opening operation stage is executed at the current compressor operation frequency;
If the oil quantity adjusting component is executed, controlling the oil quantity adjusting component to be in the optimal opening degree of the wheel for continuously operating for a second time so as to reduce the internal oil level of the compressor to the minimum safe oil level and finish the capacity optimal operating state; then, the oil quantity adjusting part is adjusted to the first opening degree and continuously operates for the first time so as to complete a reliable optimal operation state; then, judging whether to execute the next round of optimal opening operation stage according to the heat exchange capacity of the air conditioner;
and when the opening of the oil quantity adjusting part is an optimized opening, the oil discharge quantity of the compressor is larger than the oil return quantity of the compressor, and the optimized opening is smaller than the second opening.
Optionally, according to the heat exchange capability of the air conditioner, judging whether to execute the running stage of the optimal opening of the present wheel, including:
determining the optimal opening degree of the round and the corresponding second time;
estimating an accumulated heat exchange capacity value corresponding to the second time when the oil quantity adjusting component is in the optimal opening degree of the current wheel and continuously running, and recording the accumulated heat exchange capacity value as a first heat exchange capacity parameter value of the current wheel;
comparing a first heat exchange capacity parameter value of the current wheel with a first threshold, wherein the first threshold is an accumulated heat exchange capacity value corresponding to the fact that the oil quantity adjusting component is at the first opening for the first time;
If the first heat exchange capacity parameter value of the current round is smaller than the first threshold value, the current round of optimization opening operation stage is not executed;
and if the first heat exchange capacity parameter value of the current round is larger than or equal to the first threshold value, judging whether to execute the optimized opening operation phase of the current round according to the second heat exchange capacity parameter value and whether to execute the optimized opening operation phase at the current compressor operation frequency.
Optionally, determining the optimal opening degree of the present round includes:
if the optimized opening operation stage is not executed under the current compressor operation frequency, determining the optimized opening of the present wheel according to the second opening, wherein the optimized opening of the present wheel is smaller than the second opening;
if the optimized opening operation stage is executed under the current compressor operation frequency, the preset opening is reduced on the basis of the optimized opening of the previous round, and the optimized opening of the current round is obtained.
Optionally, determining the second time corresponding to the optimal opening of the present round includes: and determining a second time corresponding to the current compressor oil discharge amount and the optimal opening of the present wheel according to the second pre-stored information.
Optionally, estimating the accumulated heat exchange capacity value corresponding to the second time when the oil quantity adjusting component is in the optimized opening of the present wheel and continuously operates, and recording the accumulated heat exchange capacity value as the first heat exchange capacity parameter value of the present wheel, including:
Adjusting the oil quantity adjusting part to the optimal opening degree of the main wheel;
acquiring the heat exchange capacity of the oil quantity adjusting part when the oil quantity adjusting part is positioned at the optimal opening degree of the main wheel;
and calculating the integral sum of the heat exchange capacity and the second time to obtain a first heat exchange capacity parameter value of the round.
Optionally, determining whether to execute the current round of optimized opening operation stage according to the second heat exchange capacity parameter value and whether to execute the optimized opening operation stage at the current compressor operation frequency includes:
estimating the average heat exchange capacity value of the optimized opening operation stage of the round, and taking the average heat exchange capacity value as a second heat exchange capacity parameter value of the round;
if the optimal opening operation stage is not executed under the current compressor operation frequency, judging whether to execute the optimal opening operation stage of the present round according to a second heat exchange capacity parameter value of the present round and a second threshold value, wherein the second threshold value is the heat exchange capacity of the oil quantity regulating component when the oil quantity regulating component is positioned at the second opening;
if the optimized opening operation stage is executed under the current compressor operation frequency, judging whether to execute the optimized opening operation stage of the current round according to the second heat exchange capacity parameter value of the current round and the second heat exchange capacity parameter value of the previous round.
Optionally, estimating the average heat exchange capacity value of the current round of optimization opening operation stage as the second heat exchange capacity parameter value of the current round includes:
calculating the sum of the first heat exchange capacity parameter value of the current round and the first threshold value, and recording the sum as a first value;
calculating the sum of the first time and the second time to be recorded as a second value;
and calculating the ratio of the first value to the second value to obtain a second heat exchange capacity parameter value of the current wheel.
Optionally, determining whether to execute the optimized opening operation stage of the present round according to the second heat exchange capacity parameter value and the second threshold value of the present round includes:
comparing a second heat exchange capacity parameter value of the present round with the second threshold;
if the second heat exchange capacity parameter value of the current round is smaller than the second threshold value, the current round of optimization opening operation stage is not executed;
and if the second heat exchange capacity parameter value of the current round is greater than or equal to the second threshold value, executing the current round of optimal opening operation stage.
Optionally, determining whether to execute the optimized opening operation stage of the present round according to the second heat exchange capacity parameter value of the present round and the second heat exchange capacity parameter value of the previous round includes:
comparing the second heat exchange capacity parameter value of the current round with the second heat exchange capacity parameter value of the previous round;
If the second heat exchange capacity parameter value of the current round is smaller than the second heat exchange capacity parameter value of the previous round, the optimal opening operation stage of the current round is not executed;
and if the second heat exchange capacity parameter value of the current round is larger than or equal to the second heat exchange capacity parameter value of the previous round, executing the optimized opening operation stage of the current round.
Optionally, determining the optimal opening according to whether an optimized opening operation phase is performed at the current compressor operation frequency includes:
if the optimized opening degree operation stage is not executed under the current compressor operation frequency, determining the second opening degree as the optimal opening degree;
if the optimized opening degree operation stage is executed under the current compressor operation frequency, determining the opening degree in the previous round of optimized opening degree operation stage as the optimal opening degree;
correspondingly, controlling the oil quantity adjusting part to continuously operate according to the optimal opening degree comprises the following steps: and regulating the oil quantity regulating part to the second opening degree to continuously run, or controlling the oil quantity regulating part to circularly execute the last round of optimal opening degree running stage.
The embodiment of the invention also provides an oil return control device, which comprises:
The first control module is used for adjusting the oil quantity adjusting part on the oil return pipeline to a first opening degree under the current operating frequency of the compressor, and maintaining the first opening degree to operate for a first time so as to enable the internal oil level of the compressor to reach the maximum safe oil level;
the second control module is used for reducing the oil quantity adjusting part to a second opening degree so as to enable the oil discharge quantity of the compressor to be equal to the oil return quantity of the compressor;
and the third control module is used for determining the optimal opening according to the heat exchange capacity of the air conditioner and controlling the oil quantity regulating component to continuously run according to the optimal opening.
The embodiment of the invention also provides an air conditioner, which comprises: the embodiment of the invention provides an oil return control device.
The embodiment of the invention also provides computer equipment, which comprises: memory, a processor and a computer program stored on the memory and executable on the processor, which processor implements the steps of the method according to the embodiments of the invention when the computer program is executed.
The embodiments of the present invention also provide a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method of the embodiments of the present invention.
By applying the technical scheme of the invention, the oil quantity adjusting part is adjusted to the first opening degree under the current operating frequency of the compressor to continuously operate for the first time, so that the internal oil level of the compressor reaches the maximum safe oil level, reliable oil return is ensured, the compressor is fully lubricated, the oil shortage of the compressor is avoided, and the reliability of the compressor is ensured. And then the oil quantity adjusting part is reduced to a second opening degree so as to ensure that the oil discharge quantity of the compressor is equal to the oil return quantity of the compressor, then the optimal opening degree is determined according to the heat exchange capacity of the air conditioner, the oil quantity adjusting part is controlled to continuously operate according to the optimal opening degree, the oil quantity adjusting part is subjected to less oil return optimizing control on the basis that the oil discharge quantity of the compressor is balanced with the oil return quantity of the compressor, the optimal opening degree with higher capacity and energy efficiency is continuously searched, the capacity and energy efficiency under the reliable oil return condition are further improved, the optimal capacity and energy efficiency can be achieved, and the reliable operation of the compressor can be ensured. After the maximum safe oil level is reached, the oil return amount is reduced through less oil return control, the refrigerant is ensured to fully participate in heat exchange, the air conditioning capacity and energy efficiency are improved, the capacity improving effect in the less oil return stage is fully utilized, and the influence factors of the heat exchange capacity and the reliability are considered.
Drawings
Fig. 1 is a flowchart of an oil return control method according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an air conditioner according to a second embodiment of the present invention;
fig. 3 is a flow chart of oil return control provided in the second embodiment of the present invention;
fig. 4 is a control schematic diagram of a fuel quantity adjusting component according to a second embodiment of the present invention;
fig. 5 is a second control schematic diagram of the oil quantity adjusting component according to the second embodiment of the present invention;
fig. 6 is a control schematic diagram III of the oil quantity adjusting component provided in the second embodiment of the present invention;
fig. 7 is a control schematic diagram of a fuel quantity adjusting component according to a second embodiment of the present invention;
fig. 8 is a block diagram of an oil return control device according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, 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.
It should be noted that the terms "first," "second," and the like in the description and the claims and drawings of the present invention are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.
Example 1
The embodiment provides an oil return control method, and fig. 1 is a flowchart of the oil return control method provided in the first embodiment of the invention, as shown in fig. 1, and the method includes the following steps:
s101, under the current operating frequency of the compressor, adjusting the oil quantity adjusting part on the oil return pipeline to a first opening degree, and maintaining the first opening degree to operate for a first time so as to enable the internal oil level of the compressor to reach the maximum safe oil level.
S102, the oil quantity adjusting component is reduced to a second opening degree, so that the oil discharge quantity of the compressor is equal to the oil return quantity of the compressor.
And S103, determining the optimal opening according to the heat exchange capacity of the air conditioner, and controlling the oil quantity regulating part to continuously operate according to the optimal opening.
The opening degree of the oil quantity adjusting part is changed, so that the oil return quantity of the compressor can be controlled. The first opening is an oil passing opening at a current compressor operating frequency, and when the oil quantity adjusting part is the first opening, the oil discharge quantity of the compressor is smaller than the oil return quantity of the compressor. The first time is a continuous operation time of the oil quantity adjusting part at the first opening degree, and can be called an oil passing time. After the oil quantity adjusting part is adjusted to the first opening degree and continuously operates for a first time, the internal oil level of the compressor reaches the maximum safe oil level, so that reliable oil return is ensured, the compressor is fully lubricated, oil shortage of the compressor is avoided, and the reliability of the compressor is ensured.
The second opening is the oil return stable opening at the current compressor frequency, and when the oil quantity adjusting part is the second opening, the oil discharge quantity of the compressor is equal to the oil return quantity of the compressor. The second opening is smaller than the first opening.
The heat exchange capability of the air conditioner can be embodied by the operation capability, the operation energy efficiency or the air outlet temperature of the indoor unit. The optimal opening is smaller than the first opening. The optimal opening degree can further improve the capacity and energy efficiency of the air conditioner on the premise of reliable oil return, and the maximization of the heat exchange capacity of the air conditioner is ensured.
If the compressor operating frequency is changed, the corresponding first opening, first time, second opening and optimal opening are changed, so if the change of the compressor operating frequency is detected, the method described in the embodiment is re-executed to determine the optimal opening under the new compressor operating frequency.
According to the embodiment, under the current operating frequency of the compressor, the oil quantity adjusting part is adjusted to the first opening degree to continuously operate for the first time, so that the internal oil level of the compressor reaches the maximum safe oil level, reliable oil return is ensured, the compressor is fully lubricated, oil shortage of the compressor is avoided, and the reliability of the compressor is ensured. And then the oil quantity adjusting part is reduced to a second opening degree so as to ensure that the oil discharge quantity of the compressor is equal to the oil return quantity of the compressor, then the optimal opening degree is determined according to the heat exchange capacity of the air conditioner, the oil quantity adjusting part is controlled to continuously operate according to the optimal opening degree, the oil quantity adjusting part is subjected to less oil return optimizing control on the basis that the oil discharge quantity of the compressor is balanced with the oil return quantity of the compressor, the optimal opening degree with higher capacity and energy efficiency is continuously searched, the capacity and energy efficiency under the reliable oil return condition are further improved, the optimal capacity and energy efficiency can be achieved, and the reliable operation of the compressor can be ensured. After the maximum safe oil level is reached, the oil return amount is reduced through less oil return control, the refrigerant is ensured to fully participate in heat exchange, the air conditioning capacity and energy efficiency are improved, the capacity improving effect in the less oil return stage is fully utilized, and the influence factors of the heat exchange capacity and the reliability are considered. And the oil level detection module is not required to be arranged in the compressor, so that the cost is saved.
In one embodiment, before the oil amount adjusting part on the oil return line is adjusted to the first opening degree, the oil control device further includes: obtaining current preset parameters, wherein the preset parameters comprise: compressor operating frequency, suction temperature, suction pressure, discharge temperature, and discharge pressure; and determining a first opening degree and a first time corresponding to the current preset parameters according to the first pre-stored information, wherein when the opening degree of the oil quantity adjusting component is the first opening degree, the oil discharge quantity of the compressor is smaller than the oil return quantity of the compressor.
The corresponding relation between different preset parameters and the first opening degree and the corresponding relation between the different preset parameters and the first time can be preset through experiments, and the corresponding relation is stored to be used as first pre-stored information. Aiming at different preset parameters, the corresponding first opening degree and first time can ensure that the internal oil level of the compressor reaches the maximum safe oil level after the oil quantity adjusting part is in the first opening degree and operates for the first time under the current operating frequency of the compressor.
According to the method, the corresponding first opening degree and first time are determined according to the current running condition of the air conditioner, the oil quantity adjusting part is adjusted to the first opening degree, the oil discharge quantity of the compressor is smaller than the oil return quantity of the compressor, after the first time is continuously operated, the oil level in the compressor reaches the maximum safe oil level, and the oil return control can ensure the running reliability of the compressor.
In one embodiment, before the oil amount adjusting means is reduced to the second opening degree, further comprising: obtaining current preset parameters, wherein the preset parameters comprise: compressor operating frequency, suction temperature, suction pressure, discharge temperature, and discharge pressure; calculating according to the current preset parameters to obtain the current oil discharge amount of the compressor; and calculating to obtain a second opening according to the current compressor oil discharge amount, the current compressor operating frequency and the current lubricating oil temperature, wherein when the opening of the oil quantity regulating part is the second opening, the compressor oil discharge amount is equal to the compressor oil return amount, and the second opening is smaller than the first opening.
The first calculation model and the second calculation model can be obtained through fitting according to experimental test data. The first calculation model is used for obtaining the oil discharge amount of the compressor in the current running state of the air conditioner. The inputs of the first calculation model are the compressor operating frequency, suction temperature, suction pressure, discharge temperature and discharge pressure, and the output is the compressor discharge amount under this condition. The second calculation model is used for acquiring a second opening degree. The input of the second calculation model is the compressor operating frequency, the lubricating oil temperature and the compressor oil discharge amount obtained by the first calculation model, and the output is the second opening under the condition.
According to the embodiment, the corresponding second opening degree is determined according to the current running condition of the air conditioner, the oil quantity adjusting part is adjusted to the second opening degree, the oil discharge quantity of the compressor is equal to the oil return quantity of the compressor, and therefore oil return is stable.
In one embodiment, determining an optimal opening according to a heat exchange capability of an air conditioner includes: judging whether to execute the operation stage of the optimal opening degree of the round according to the heat exchange capability of the air conditioner; if not, determining an optimal opening according to whether an optimal opening operation stage is executed at the current compressor operation frequency; if the oil quantity control part is executed, controlling the oil quantity control part to be in the optimal opening degree of the wheel for continuously operating for a second time so as to reduce the internal oil level of the compressor to the minimum safe oil level and finish the capacity optimal operating state; then the oil quantity adjusting part is adjusted to a first opening degree and continuously operates for a first time so as to complete a reliable optimal operation state; and then, judging whether to execute the next round of optimal opening operation stage according to the heat exchange capacity of the air conditioner.
The optimal opening operation stage is used for determining the optimal opening. The optimized opening degree operation stage comprises the following steps: the capacity optimal running state and the reliable optimal running state. The capacity optimal operation state refers to that the oil quantity adjusting component is adjusted to the optimal opening degree of the wheel and continuously operates for a second time. The reliable and optimal running state means that the oil quantity adjusting component is adjusted to the first opening degree and continuously runs for a first time.
When the opening degree of the oil quantity adjusting part is the optimized opening degree, the oil discharge quantity of the compressor is larger than the oil return quantity of the compressor. The optimized opening is smaller than the second opening. The second time is a continuous operation time of the oil quantity adjusting part at the optimal opening degree, and can be called a reliable oil return time.
Executing the optimized opening degree operation phase indicates that the optimized opening degree adjustment is performed. When the optimized opening operation stage is executed, the optimized opening is lower than the second opening, and the oil discharge amount of the compressor is larger than the oil return amount of the compressor at the moment, if the oil discharge amount is longer than the optimized opening, the oil shortage of the compressor can be caused, so that the reliable optimal operation state is required to be executed for oil return, and the oil shortage of the compressor is avoided.
According to the method and the device, the optimal opening can be reliably determined by judging and executing the optimal opening operation stage and adjusting the optimal opening. In the optimal opening operation stage, the optimal operation state of the capacity is firstly experienced, so that the operation capacity and the energy efficiency of the air conditioner are optimal, but the internal oil level of the compressor is reduced to the minimum safe oil level, and the oil discharge amount of the compressor is smaller than the oil return amount of the compressor through the reliable optimal operation state, so that the operation reliability of the compressor is ensured, and the heat exchange capacity and the reliability are considered.
In one embodiment, determining whether to execute the current round of optimized opening operation stage according to the heat exchange capability of the air conditioner includes: determining the optimal opening degree of the round and the corresponding second time; estimating an accumulated heat exchange capacity value corresponding to the second time when the oil quantity adjusting component is in the optimized opening of the current wheel and continuously running, and recording the accumulated heat exchange capacity value as a first heat exchange capacity parameter value of the current wheel; comparing the first heat exchange capacity parameter value of the current round with a first threshold value; if the first heat exchange capacity parameter value of the round is smaller than a first threshold value, the running stage of the round of optimizing the opening degree is not executed; if the first heat exchange capacity parameter value of the current round is greater than or equal to the first threshold value, judging whether to execute the optimized opening operation phase of the current round according to the second heat exchange capacity parameter value and whether to execute the optimized opening operation phase under the current compressor operation frequency.
The first heat exchange capacity parameter value can embody accumulated heat exchange capacity corresponding to the capacity optimal operation state in the optimal opening operation stage.
The first threshold is an accumulated heat exchange capacity value corresponding to the fact that the oil quantity adjusting component is at the first opening for a first time. Specifically, the heat exchange capacity of the oil quantity adjusting component when the oil quantity adjusting component is at the first opening degree can be obtained, and the integral sum of the heat exchange capacity and the first time is calculated to obtain a first threshold value. The first threshold value can embody accumulated heat exchange capacity corresponding to a reliable optimal operation state in an optimal opening operation stage.
By comparing the first heat exchange capacity parameter value with the first threshold value, the accumulated heat exchange capacity of the capacity optimal operation state and the accumulated heat exchange capacity of the reliable optimal operation state in the same optimal opening operation stage can be judged.
In the embodiment, under the condition that the accumulated heat exchange capacity of the capacity optimal operation state is lower than that of the reliable optimal operation state in the current round of optimal opening operation stage, the current round of optimal opening operation stage is not executed, and the reduction of the air conditioning capacity is avoided; and under the condition that the accumulated heat exchange capacity of the capacity optimal operation state in the current round of optimal opening operation stage is higher than that of the reliable optimal operation state, further judging whether to execute the current round of optimal opening operation stage so as to ensure the capacity to be optimal.
Specifically, determining the optimal opening degree of the present wheel includes: if the optimized opening operation stage is not executed under the current compressor operation frequency, determining the optimized opening of the round according to the second opening, wherein the optimized opening of the round is smaller than the second opening; if the optimized opening operation stage is executed under the current compressor operation frequency, the preset opening is reduced on the basis of the optimized opening of the previous round, and the optimized opening of the current round is obtained.
The optimal opening of the round is determined according to the second opening, and an optimal opening value can be given according to a certain rule on the premise that the optimal opening is smaller than the second opening. The preset opening degree may be preset according to actual situations, for example, the preset opening degree is 3PLS.
According to the method and the device, whether the optimal opening degree adjustment is carried out for the first time or not is judged according to the current operating frequency of the compressor, and the optimal opening degree of the round can be rapidly and reliably determined.
Specifically, determining the second time corresponding to the optimal opening of the present round includes: and determining a second time corresponding to the current compressor oil discharge amount and the optimal opening of the wheel according to the second pre-stored information. The corresponding relation between different compressor oil discharge amounts and the optimized opening and the second time can be preset through experiments, and the corresponding relation is stored to be used as second pre-stored information. Aiming at different oil discharge amounts and optimal opening degrees of the compressors, the corresponding second time can ensure that the internal oil level of the compressor is reduced to the minimum safe oil level and is not lower than the minimum safe oil level after the oil quantity adjusting part is in the optimal opening degree operation for the second time under the current operating frequency of the compressor. The magnitude of the second time is positively correlated with the optimal opening, i.e., the smaller the optimal opening, the smaller the second time. The second time corresponding to the current running condition of the air conditioner can be determined quickly and reliably.
Specifically, the accumulated heat exchange capacity value corresponding to the second time when the estimated oil quantity adjusting component is in the optimized opening of the present wheel and continuously operates is recorded as the first heat exchange capacity parameter value of the present wheel, and the method comprises the following steps: the oil quantity adjusting part is adjusted to the optimal opening degree of the wheel; acquiring the heat exchange capacity of the oil quantity regulating part when the oil quantity regulating part is positioned at the optimal opening degree of the main wheel; and calculating the integral sum of the heat exchange capacity and the second time to obtain a first heat exchange capacity parameter value of the round. Therefore, the accumulated heat exchange capacity corresponding to the capacity optimal running state can be rapidly estimated.
In one embodiment, determining whether to perform the current round of optimized opening degree operation phase based on the second heat exchange capacity parameter value and whether to perform the optimized opening degree operation phase at the current compressor operation frequency includes: estimating the average heat exchange capacity value of the optimized opening operation stage of the round, and taking the average heat exchange capacity value as a second heat exchange capacity parameter value of the round; if the optimal opening operation stage is not executed under the current compressor operation frequency, judging whether to execute the optimal opening operation stage of the round according to the second heat exchange capacity parameter value and the second threshold value of the round; if the optimized opening operation stage is executed under the current compressor operation frequency, judging whether to execute the optimized opening operation stage of the current round according to the second heat exchange capacity parameter value of the current round and the second heat exchange capacity parameter value of the previous round.
The second heat exchange capacity parameter value can represent the average heat exchange capacity of the optimized opening operation stage. The second threshold is the heat exchange capacity when the oil quantity adjusting part is at the second opening degree.
And by comparing the second heat exchange capacity parameter value with a second threshold value, the average heat exchange capacity of the optimized opening operation stage and the heat exchange capacity of the oil quantity adjusting part when the oil quantity adjusting part is at the second opening can be judged.
The average heat exchange capacity of the optimal opening operation stage of the round and the average heat exchange capacity of the optimal opening operation stage of the previous round can be judged by comparing the second heat exchange capacity parameter value of the round with the second heat exchange capacity parameter value of the previous round.
The embodiment can ensure that the heat exchange capacity of the air conditioner is higher if the operation stage of the optimal opening degree of the round is executed.
Specifically, the estimating the average heat exchange capacity value of the current round of optimized opening operation stage as the second heat exchange capacity parameter value of the current round includes: calculating the sum of the first heat exchange capacity parameter value and a first threshold value of the current round, and recording the sum as a first value; calculating the sum of the first time and the second time, and recording the sum as a second value; and calculating the ratio of the first value to the second value to obtain a second heat exchange capacity parameter value of the round.
In one embodiment, determining whether to execute the optimized opening operation phase of the present round according to the second heat exchange capacity parameter value and the second threshold value of the present round includes: comparing the second heat exchange capacity parameter value of the present round with a second threshold value; if the second heat exchange capacity parameter value of the round is smaller than the second threshold value, the round of optimization opening operation stage is not executed; and if the second heat exchange capacity parameter value of the round is greater than or equal to a second threshold value, executing the round of optimal opening operation stage. The embodiment can ensure that the average heat exchange capacity of the operation stage of the optimal opening degree to be executed is higher than the heat exchange capacity of the oil quantity adjusting part when the oil quantity adjusting part is at the second opening degree.
In one embodiment, determining whether to execute the optimal opening operation phase of the present round according to the second heat exchange capacity parameter value of the present round and the second heat exchange capacity parameter value of the previous round includes: comparing the second heat exchange capacity parameter value of the current round with the second heat exchange capacity parameter value of the previous round; if the second heat exchange capacity parameter value of the current round is smaller than the second heat exchange capacity parameter value of the previous round, the optimal opening operation stage of the current round is not executed; and if the second heat exchange capacity parameter value of the round is greater than or equal to the second heat exchange capacity parameter value of the previous round, executing the optimized opening operation stage of the round. The embodiment can ensure that the average heat exchange capacity of the optimal opening operation stage to be executed is higher than that of the previous optimal opening operation stage.
In one embodiment, determining the optimal opening according to whether the optimal opening operation phase is performed at the current compressor operation frequency includes: if the optimized opening degree operation stage is not executed under the current compressor operation frequency, determining the second opening degree as the optimal opening degree; if the optimized opening degree operation stage is executed under the current compressor operation frequency, determining the opening degree in the previous round of optimized opening degree operation stage as the optimal opening degree. Correspondingly, the oil quantity control part is controlled to continuously operate according to the optimal opening degree, and comprises the following steps: and (3) regulating the oil quantity regulating part to the second opening degree to continuously run, or controlling the oil quantity regulating part to circularly execute the last round of optimal opening degree running stage. According to the method and the device, the optimal opening for guaranteeing the heat exchange capacity and the energy efficiency of the air conditioner can be determined according to the current running condition of the air conditioner.
As described above, the heat exchanging capability of the air conditioner may be embodied by the operation capability, the operation energy efficiency, or the indoor unit outlet air temperature. When heating is performed, the higher the air outlet temperature of the indoor unit is, the higher the heat exchange capacity is; when in refrigeration, the lower the air outlet temperature of the indoor unit is, the higher the heat exchange capacity is. The corresponding relation between the air outlet temperature of the indoor unit and the heat exchange capacity in the refrigeration mode can be preset, when the judgment of the optimal opening operation stage is carried out, the current air outlet temperature of the indoor unit is converted into the corresponding heat exchange capacity according to the corresponding relation, so that relevant parameters, such as a first heat exchange capacity parameter value, a second heat exchange capacity parameter value, a first threshold value and a second threshold value, are obtained through calculation, the judgment process is applicable to the operation capacity, the operation energy efficiency and the air outlet temperature of the indoor unit, and the universality of the judgment process is ensured.
Of course, the corresponding judging flow can be set independently for the air outlet temperature of the indoor unit in the refrigeration mode, specifically, if the accumulated air outlet temperature of the present wheel is greater than the first threshold value of the air outlet temperature in the refrigeration mode, the present wheel is not executed to optimize the opening operation stage; if the accumulated air outlet temperature of the present wheel is smaller than or equal to the first threshold value of the air outlet temperature, judging whether to execute the present wheel optimizing opening operation stage according to the average air outlet temperature of the present wheel and whether to execute the optimizing opening operation stage under the current compressor operation frequency. If the average air outlet temperature of the round is greater than a second threshold value of the air outlet temperature, the running stage of the round of optimal opening degree is not executed; and if the average air outlet temperature of the round is smaller than or equal to the second threshold value of the air outlet temperature, executing the running stage of the round of optimal opening. If the average air outlet temperature of the round is larger than the average air outlet temperature of the previous round, the running stage of the optimal opening of the round is not executed; and if the average air outlet temperature of the round is smaller than or equal to the average air outlet temperature of the previous round, executing the running stage of the optimized opening of the round.
In the running process of the air conditioner, the oil return amount is too large, and although the reliable running of the compressor can be ensured, the running capacity and energy efficiency of the air conditioner are reduced. Too little oil return increases the risk of oil starvation of the compressor. If the air conditioning capacity and energy efficiency are improved compared with the control of excessive oil return from the viewpoint of balancing the compressor oil discharge amount and the compressor oil return amount, there is still room for continued improvement. Under different compressor operating frequency, suction and exhaust pressure and suction and exhaust temperature conditions, the oil discharge rate of the compressors is also different, and when the compressors are just started, the opening degree of the oil quantity regulating part is very large, and after the oil return quantity reaches the maximum value, namely the oil level. After the reliable oil level is reached, the oil return quantity is reduced through less oil return control, so that the refrigerant is ensured to fully participate in heat exchange, and the air conditioning capacity and energy efficiency are improved. That is, there is a section from the current reliable oil level to the minimum safe oil level, in which the amount of oil return needs to be reduced in order to optimize the air conditioning operation capability, energy efficiency. According to the embodiment, the opening degree of the oil quantity control part is optimized and controlled through the air conditioner heat exchange capacity and the compressor operation reliability bidirectional control, so that the air conditioner capacity and the energy efficiency are optimal, and the reliable operation of the compressor is ensured.
Example two
The oil return control method described above is described below in connection with a specific embodiment, however, it should be noted that this specific embodiment is only for better illustrating the present application, and is not meant to be a undue limitation on the present application. The same or corresponding terms as those of the above embodiments are explained, and the present embodiment will not be repeated.
As shown in fig. 2, which is a schematic diagram of an air conditioner, the air conditioner includes: a compressor 1, an oil separator 2, an outdoor heat exchanger 3, a throttle member 4, an indoor heat exchanger 5, and an oil amount adjusting member 6. The compressor 1 will carry partial lubricating oil when discharging high temperature high pressure gaseous refrigerant, and oil separator 2 separates refrigerant and oil back, returns the oil that separates to compressor 1 through the oil return pipeline, and the oil separator 2 is called the oil return pipeline with the pipeline that compressor 1 suction side is connected, sets up oil mass adjusting part 6 on the oil return pipeline, through the aperture that changes oil mass adjusting part 6, can control compressor return oil volume. The oil amount adjusting member 6 may be a valve element such as a solenoid valve or an electronic expansion valve.
The oil return control is to adjust the opening of the oil quantity adjusting part 6. In this embodiment, the adjustment of the oil amount adjustment means is performed in three stages: the method comprises an oil return opening operation stage, an oil return stable opening operation stage and an optimized opening operation stage.
In the over-oil return opening operation stage, determining a corresponding over-oil return opening delta according to the current operation condition of the air conditioner 0 (i.e., first opening degree) and oil-return time Δt x (i.e., the first time) and adjusts the oil amount adjusting means 6 to the oil return opening delta 0 Continuous operation Δt x Time to bring the internal oil level of the compressor to a maximum safe oil level. Wherein, when the opening degree of the oil quantity adjusting part 6 is delta 0 When the oil discharge amount of the compressor is smaller than the oil return amount of the compressor.
Specifically, the corresponding oil return opening delta is obtained according to preset parameters 0 Oil return time Δt x . Wherein the preset parameter is used for obtaining the oil passing opening delta of the oil quantity regulating component 6 0 And the corresponding oil return time delta t x . The preset parameters comprise: compressor operating frequency, suction temperature, discharge temperature, suction pressure, and discharge pressure. Different preset parameters and the oil return opening delta can be preset through experiments 0 The duration Δt of the opening degree x And stores the correspondence, for example, in a relationship table. For different preset parameters, corresponding delta 0 Δt (delta t) x It is possible to ensure that the oil quantity adjusting member 6 is at the opening delta 0 Run Δt x After a certain time the internal oil level of the compressor reaches a maximum safe oil level. In practical application, the current preset parameters can be obtained, and then the current preset parameters are read from the pre-stored corresponding relation (namely the first pre-stored information) Delta corresponding to the preset parameter of (2) 0 Δt (delta t) x 。
In the oil return stable opening operation stage, determining a corresponding oil return stable opening delta according to the current operation condition of the air conditioner x (i.e., the second opening degree) and adjusts the oil quantity adjusting means 6 to the oil return stable opening degree delta x . Wherein delta x ＜δ 0 When the opening of the oil quantity adjusting part 6 is delta x And when the oil discharge amount of the compressor is equal to the oil return amount of the compressor.
Specifically, the oil return stable opening delta is obtained through a first calculation model and a second calculation model x . Wherein the first computational model and the second computational model are both computational models that are fitted according to experimental test data. The first calculation model is used for obtaining the oil discharge amount of the compressor in the current running state of the air conditioner. The inputs of the first calculation model are the compressor operating frequency, suction temperature, suction pressure, discharge temperature and discharge pressure, and the output is the compressor discharge amount under this condition. The second calculation model is used for obtaining the oil return stable opening delta of the oil quantity regulating component 6 x At this opening, the compressor oil return amount is equal to the compressor oil discharge amount in the current operation state. The input of the second calculation model is the compressor running frequency, the lubricating oil temperature and the compressor oil discharge amount obtained by the first calculation model, and the oil return stable opening delta under the condition is output x . In practical application, the current compressor operating frequency, suction temperature, suction pressure, exhaust temperature and exhaust pressure are obtained and input into a first calculation model to obtain a corresponding compressor oil discharge amount, and then the compressor operating frequency, the lubricating oil temperature and the compressor oil discharge amount are input into a second calculation model to obtain a corresponding oil return stable opening delta x 。
The optimized opening degree operation stage comprises the following steps: the capacity optimal running state and the reliable optimal running state. The capacity optimal operation state means that the oil quantity adjusting part 6 is adjusted to the optimal opening delta y And continuously run for a reliable oil return time delta t y . The reliable and optimal running state means that the oil quantity regulating part 6 is regulated to the oil passing opening delta 0 And continuously run for an oil return time delta t x . Wherein delta y ＜δ x When the opening of the oil quantity adjusting part 6 is delta y When the oil discharge amount of the compressor is larger than the oil return amount of the compressor.
When executing the optimized opening degree operation phase, determining the corresponding optimized opening degree delta according to whether the optimized opening degree adjustment is performed at the current compressor operation frequency y And determining corresponding reliable oil return time delta t according to the current running condition of the air conditioner y (i.e., the second time). Then the oil quantity adjusting part 6 is adjusted to the optimized opening delta y Continuous operation Δt y And the time is the capacity optimal operation state of the optimal opening operation stage. After completion of the capacity optimal operation state (i.e., Δt y Time arrives), the internal oil level of the compressor has been lowered to the minimum safe oil level, and therefore, a reliable optimum operation state in which the oil amount adjusting member 6 is at the excessive oil return opening delta is required to be completed before the judgment of the next round of optimum opening operation stage is performed 0 Continuous operation Δt x Time.
Specifically, the corresponding optimal opening delta is determined according to whether the optimal opening adjustment is performed at the current compressor operating frequency y Comprising: when the optimal opening degree adjustment is not performed at the current compressor operating frequency, delta can be adjusted y Giving an initial value, required to satisfy delta y ＜δ x . When the optimal opening degree adjustment is performed at the current compressor operation frequency, the optimal opening degree delta of the previous round can be obtained y-1 Continuously reducing to obtain delta on the basis of the (A) y ，δ y ＜δ y-1 ＜δ x . For example, 5PLS may be reduced if the opening delta is optimized for the previous round y-1 For 45PLS, decreasing 5PLS, the optimal opening delta for the round y 40PLS.
Specifically, corresponding reliable oil return time delta t is determined according to the current running condition of the air conditioner y Comprising: obtaining the optimized opening delta according to the specified parameters y Corresponding reliable oil return time delta t y 。Δt y For the fuel quantity adjusting part 6 to be at delta y The duration of opening is such that the internal compressor oil level is continually reduced to a minimum safe level. Δt (delta t) y Size and delta of (d) y Positive correlation, i.e. delta y The smaller Δt y The smaller.
Wherein the specified parameters are used for obtaining different optimized opening delta y Corresponding reliable oil return time delta t y . The specified parameters include: the current opening degree of the compressor discharge amount and oil amount adjusting means 6 (i.e., the optimized opening degree δ determined in this step) y ). Different specified parameters and reliable oil return time delta t can be preset through experiments y And stores the correspondence, for example, in a relationship table. For different specified parameters, corresponding Δt y It is possible to ensure that the oil quantity adjusting member 6 is at the opening delta y Run Δt y After a time, the internal oil level of the compressor is reduced to the minimum safe oil level and is not lower than the minimum safe oil level. In practical application, the current specified parameter can be obtained, and then Δt corresponding to the current specified parameter is read from the pre-stored corresponding relation (i.e. the second pre-stored information) y 。
In addition, whether to execute the present round of optimization opening operation stage requires a first judgment and a second judgment, and the operation capability of the air conditioner will be described below as an example.
The first judgment is as follows: acquiring the oil quantity regulating part 6 at the oil passing opening delta 0 Run ability at time Q 0 Acquiring the oil return time delta t corresponding to the opening x Calculate Q 0 And delta t x Is recorded as the integral sum of the first threshold value sigma Q 0 . Acquiring the oil quantity adjusting part 6 at the optimal opening delta y Run ability at time Q y Obtaining the reliable oil return time delta t corresponding to the opening y Calculate Q y And delta t y Is recorded as the integral sum of the first heat exchange capacity parameter value Σq of the present round y . When ΣQ y Less than ΣQ 0 When the method is used, the operation stage of the optimal opening degree of the round is not executed; otherwise, the second judgment is carried out.
The secondary judgment is divided into two cases:
in the first case, the optimized opening degree operation stage is not executed under the current compressor operation frequency, specifically: the oil quantity acquisition adjusting part 6 is in returnOil stability opening delta x Run ability at time Q x Recorded as a second threshold value Q x . Calculating the average capacity of the optimized opening degree operation phase, i.e. Σq y 、ΣQ 0 The ratio of the sum to the sum of Deltat and Deltat is recorded as the second heat exchange capacity parameter value of the roundWhen->Less than Q x When the method is used, the operation stage of the optimal opening degree of the round is not executed; otherwise, executing the running stage of the optimal opening degree of the round.
And secondly, executing an optimized opening degree operation stage under the current compressor operation frequency, wherein the optimized opening degree operation stage specifically comprises the following steps: calculating and memorizing a second heat exchange capacity parameter value in the operation stage of the last round of optimized opening degree If->Less than->When the method is used, the operation stage of the optimal opening degree of the round is not executed; otherwise, executing the running stage of the optimal opening degree of the round.
As shown in fig. 3, taking the operation capability of the air conditioner as an example, the oil return control includes the following steps:
s301, acquiring the current operation frequency of the compressor.
S302, acquiring a corresponding oil return opening delta according to preset parameters 0 Oil return time Δt x And the oil quantity adjusting part 6 is adjusted to the oil passing opening delta 0 Continuous operation Δt x Time.
S303, acquiring the oil return stable opening delta through the first calculation model and the second calculation model x And the oil quantity regulating part 6 is adjusted to be smaller to the oil return stable opening delta x . Wherein delta x ＜δ 0 。
S304, determining the optimal opening delta of the round y And adjusts the oil quantity adjusting part 6 to an optimal opening delta y 。
When the optimal opening degree adjustment is not performed at the current compressor operating frequency, delta can be adjusted y Giving an initial value, required to satisfy delta y ＜δ x 。
When the optimal opening degree adjustment is performed at the current compressor operation frequency, the optimal opening degree delta of the previous round can be obtained y-1 Continuously reducing to obtain delta on the basis of the (A) y ，δ y ＜δ y-1 ＜δ x . For example, 5PLS may be reduced if the opening delta is optimized for the previous round y-1 For 45PLS, decreasing 5PLS, the optimal opening delta for the round y 40PLS.
Obtaining the optimized opening delta according to the specified parameters y Corresponding reliable oil return time delta t y 。
S305, judging whether the first heat exchange capacity parameter value of the current round is smaller than a first threshold value, if yes, proceeding to S306, otherwise proceeding to S309.
S306, the present round of optimization opening degree operation phase is not executed, and the process proceeds to S307.
S307, judging whether the optimal opening degree adjustment is performed for the first time under the current compressor operation frequency, if so, entering S308, otherwise, entering S316.
S308, adjusting the oil quantity adjusting part 6 to the oil return stable opening delta x And continuously operates at this opening degree.
S309, judging whether to perform the optimal opening degree adjustment for the first time under the current compressor operation frequency, if yes, proceeding to S310, otherwise proceeding to S312.
S310, judging whether the second heat exchange capacity parameter value of the current round is smaller than a second threshold value, if yes, proceeding to S311, otherwise proceeding to S313.
S311, the present round of optimization opening degree operation phase is not executed, and the process proceeds to S308.
S312, judging whether the second heat exchange capacity parameter value of the current round is smaller than the second heat exchange capacity parameter value of the previous round, if so, entering S315, otherwise, entering S313.
S313, executing the running stage of the optimal opening of the round, and then entering S314.
Specifically, the optimizing opening operation phase includes: the capacity optimal running state and the reliable optimal running state. The oil quantity adjusting part 6 is positioned at the optimal opening delta y Continuous operation Δt y And the time is the capacity optimal operation state of the optimal opening operation stage. After completion of the capacity optimal operation state (i.e., Δt y Time arrives), the internal oil level of the compressor has been lowered to the minimum safe oil level, and therefore, a reliable optimum operation state in which the oil amount adjusting member 6 is at the excessive oil return opening delta is required to be completed before the judgment of the next round of optimum opening operation stage is performed 0 Continuous operation Δt x Time.
And S314, entering the judgment of the operation stage of the next round of optimal opening, namely returning to S305 to determine the optimal opening of the next round and continuing the judgment.
S315, the present round of optimization opening degree operation phase is not executed, and the process proceeds to S316.
S316, the oil quantity adjusting part 6 is adjusted to the optimal opening degree of the previous round, and the previous round of optimal opening degree operation stage is continuously operated according to the optimal opening degree.
S3021, obtaining that the oil amount adjusting member 6 is at the oil return exceeding opening delta 0 Run ability at time Q 0 Calculate Q 0 And delta t x Is recorded as the integral sum of the first threshold value sigma Q 0 。
S3031, the oil quantity regulating component 6 is acquired to be at the oil return stable opening delta x Run ability at time Q x Recorded as a second threshold value Q x 。
S3041, acquiring that the oil quantity adjusting part 6 is at the optimal opening delta y Run ability at time Q y Obtaining the reliable oil return time delta t corresponding to the opening y Calculate Q y And delta t y Is recorded as the integral sum of the first heat exchange capacity parameter value Σq of the present round y . Calculating the average capacity of the optimized opening degree operation phase, i.e. Σq y 、ΣQ 0 Sum and delta t y 、Δt x Ratio of sumsThe second heat exchange capacity parameter value is recorded as the value of the second heat exchange capacity parameter of the main wheel
In step S303, the oil amount adjusting means 6 is adjusted to be small to the oil return stable opening δ x And then, judging whether to execute the optimized opening degree operation stage or not. Specifically, the oil amount adjusting member 6 is adjusted to the oil return stable opening delta in a small manner x After that, at the oil return stable opening delta x The oil quantity adjusting part 6 can be adjusted to be smaller to the optimal opening delta after the preset time y Through a preset time, the oil quantity regulating part 6 can be ensured to be at the oil return stable opening delta x The stable operation capability is convenient for subsequent calculation and participates in the judgment of the optimal opening operation stage. For example, the predetermined time may be 3 minutes.
As shown in fig. 4, when the determination of the first optimum opening degree operation phase is not performed, the oil amount adjusting means 6 is returned to the oil return stable opening degree δ x And is continuously operated.
As shown in fig. 5, when the judgment of the first optimum opening degree operation phase is performed, the oil amount adjusting means 6 adjusts the opening degree δ by the optimum opening degree δ y Last Δt y Time, after the capacity optimal running state is completed, the opening degree is increased to delta 0 Continuous operation Δt x After the reliable and optimal operation state is completed, the opening degree of the oil quantity regulating component 6 is reduced to delta y+1 And (5) entering the judgment of the optimal opening operation stage of the next round.
As shown in fig. 6, in the judgment of the optimum opening degree operation phase of the next round, when it is judged that the optimum opening degree operation phase is not performed, the oil amount adjusting means 6 returns to the optimum opening degree δ of the previous round y And according to the optimized opening delta of the previous round y And circularly executing the operation stage of optimizing the opening degree of the previous round.
As shown in fig. 7, in the judgment of the optimum opening degree operation phase of the next round, when it is judged that the optimum opening degree operation phase is executed, the oil amount adjustment means 6 adjusts the optimum opening degree δ by the optimum opening degree δ y+1 Last Δt y+1 Time, after the capacity optimal running state is completed, the opening degree is increased to delta 0 Continuous operation Δt x After the reliable and optimal operation state is completed, the opening degree of the oil quantity regulating component 6 is reduced to delta y+2 And (5) entering the judgment of the optimal opening operation stage of the next round. And (5) circularly judging in this way.
The oil passing opening operation stage can ensure the reliability of the compressor when the air conditioner is started, and after the stage is completed, the internal oil level of the compressor reaches the maximum safe oil level, and meanwhile, the heat exchange capacity under the state is acquired, so that the judgment of the opening operation stage is conveniently participated in. And then entering an oil return stable opening operation stage, mainly acquiring heat exchange capacity under the oil return stable opening, and participating in judgment of an optimized opening operation stage. In the optimal opening operation stage, the capacity optimal operation state is firstly experienced, namely the oil discharge amount of the compressor is larger than the oil return amount of the compressor through the optimal opening, at the moment, the operation capacity and the energy efficiency of the air conditioner reach the optimal state, but at the same time, the internal oil level of the compressor can be reduced to the minimum safe oil level, so that the reliable optimal operation state is required, at the moment, the oil discharge amount of the compressor is smaller than the oil return amount of the compressor, and the accumulated heat exchange capacity in the continuous process of the reliable optimal operation state is smaller than the accumulated heat exchange capacity in the continuous process of the energy efficiency optimal operation state. The average heat exchange capacity of the optimized opening operation stage is higher than that of the previous optimized opening operation stage and is also higher than that of the oil return stable opening.
According to the embodiment, the opening of the oil quantity adjusting part is adjusted through the bidirectional control of the heat exchange capacity of the air conditioner and the operation reliability of the compressor, the oil quantity adjusting part is subjected to less oil return optimizing control on the basis that the oil quantity of the compressor is balanced with the oil return quantity of the compressor, the optimal opening with higher capacity and energy efficiency is continuously searched, the capacity and energy efficiency under the reliable oil return condition are further improved, the optimal capacity and energy efficiency can be achieved, and the reliable operation of the compressor can be ensured. After the maximum safe oil level is reached, the oil return amount is reduced through less oil return control, the refrigerant is ensured to fully participate in heat exchange, the air conditioning capacity and energy efficiency are improved, the capacity improving effect in the less oil return stage is fully utilized, and the influence factors of the heat exchange capacity and the reliability are considered.
Example III
Based on the same inventive concept, the present embodiment provides an oil return control device, which may be used to implement the oil return control method described in the foregoing embodiments. The oil return control device can be implemented by software and/or hardware, and can be generally integrated into a controller of the air conditioner.
Fig. 8 is a block diagram of an oil return control device according to a third embodiment of the present invention, as shown in fig. 8, where the oil return control device includes:
The first control module 81 is configured to adjust the oil amount adjusting part on the oil return line to a first opening degree at a current operating frequency of the compressor, and maintain the first opening degree to operate for a first time, so that the internal oil level of the compressor reaches a maximum safe oil level;
a second control module 82, configured to reduce the oil amount adjusting component to a second opening degree, so that the oil amount of the compressor is equal to the oil return amount of the compressor;
and the third control module 83 is used for determining an optimal opening according to the heat exchange capability of the air conditioner and controlling the oil quantity regulating component to continuously operate according to the optimal opening.
Optionally, the oil return control device further includes:
the first obtaining module is configured to obtain a current preset parameter before the first control module 81 adjusts the oil amount adjusting component on the oil return pipeline to the first opening, where the preset parameter includes: compressor operating frequency, suction temperature, suction pressure, discharge temperature, and discharge pressure;
the determining module is used for determining a first opening degree and a first time corresponding to the current preset parameters according to first pre-stored information, wherein when the opening degree of the oil quantity adjusting component is the first opening degree, the oil discharge quantity of the compressor is smaller than the oil return quantity of the compressor.
Optionally, the oil return control device further includes:
the second obtaining module is configured to obtain current preset parameters before the second control module 82 reduces the oil amount adjusting part to the second opening, where the preset parameters include: compressor operating frequency, suction temperature, suction pressure, discharge temperature, and discharge pressure;
the first calculation module is used for calculating and obtaining the current compressor oil discharge amount according to the current preset parameters;
and the second calculation module is used for calculating and obtaining the second opening according to the current compressor oil discharge amount, the current compressor operating frequency and the current lubricating oil temperature, wherein when the opening of the oil quantity adjusting part is the second opening, the compressor oil discharge amount is equal to the compressor oil return amount, and the second opening is smaller than the first opening.
Optionally, the third control module 83 includes:
the judging unit is used for judging whether to execute the running stage of the optimal opening degree of the round according to the heat exchange capacity of the air conditioner;
a determining unit for determining the optimal opening according to whether an optimal opening operation phase is performed at a current compressor operation frequency if not;
The control unit is used for controlling the oil quantity adjusting part to be in the optimal opening degree of the wheel for continuously running for a second time if the oil quantity adjusting part is executed, so that the internal oil level of the compressor is reduced to the minimum safe oil level, and the capacity optimal running state is completed; then, the oil quantity adjusting part is adjusted to the first opening degree and continuously operates for the first time so as to complete a reliable optimal operation state; then, judging whether to execute the next round of optimal opening operation stage according to the heat exchange capacity of the air conditioner;
and when the opening of the oil quantity adjusting part is an optimized opening, the oil discharge quantity of the compressor is larger than the oil return quantity of the compressor, and the optimized opening is smaller than the second opening.
Optionally, the judging unit includes:
a determining subunit, configured to determine an optimal opening degree of the present wheel and the second time corresponding to the optimal opening degree;
the estimating subunit is used for estimating an accumulated heat exchange capacity value corresponding to the second time when the oil quantity adjusting component is in the optimal opening degree of the current wheel and continuously operating, and recording the accumulated heat exchange capacity value as a first heat exchange capacity parameter value of the current wheel;
a comparing subunit, configured to compare a first heat exchange capacity parameter value of the present wheel with a first threshold, where the first threshold is an accumulated heat exchange capacity value corresponding to the oil quantity adjusting component being at the first opening for the first time;
The control subunit is used for not executing the optimal opening operation stage of the present wheel if the first heat exchange capacity parameter value of the present wheel is smaller than the first threshold value;
and the judging subunit is used for judging whether to execute the optimal opening operation stage of the round according to the second heat exchange capacity parameter value and whether to execute the optimal opening operation stage under the current compressor operation frequency if the first heat exchange capacity parameter value of the round is larger than or equal to the first threshold value.
Optionally, the determining subunit is specifically configured to: if the optimized opening operation stage is not executed under the current compressor operation frequency, determining the optimized opening of the present wheel according to the second opening, wherein the optimized opening of the present wheel is smaller than the second opening; if the optimized opening operation stage is executed under the current compressor operation frequency, the preset opening is reduced on the basis of the optimized opening of the previous round, and the optimized opening of the current round is obtained.
Optionally, the determining subunit is specifically configured to: and determining a second time corresponding to the current compressor oil discharge amount and the optimal opening of the present wheel according to the second pre-stored information.
Optionally, the estimating subunit is specifically configured to: adjusting the oil quantity adjusting part to the optimal opening degree of the main wheel; acquiring the heat exchange capacity of the oil quantity adjusting part when the oil quantity adjusting part is positioned at the optimal opening degree of the main wheel; and calculating the integral sum of the heat exchange capacity and the second time to obtain a first heat exchange capacity parameter value of the round.
Optionally, the judging subunit is specifically configured to:
estimating the average heat exchange capacity value of the optimized opening operation stage of the round, and taking the average heat exchange capacity value as a second heat exchange capacity parameter value of the round;
if the optimal opening operation stage is not executed under the current compressor operation frequency, judging whether to execute the optimal opening operation stage of the present round according to a second heat exchange capacity parameter value of the present round and a second threshold value, wherein the second threshold value is the heat exchange capacity of the oil quantity regulating component when the oil quantity regulating component is positioned at the second opening;
if the optimized opening operation stage is executed under the current compressor operation frequency, judging whether to execute the optimized opening operation stage of the current round according to the second heat exchange capacity parameter value of the current round and the second heat exchange capacity parameter value of the previous round.
Optionally, the judging subunit is specifically configured to: calculating the sum of the first heat exchange capacity parameter value of the current round and the first threshold value, and recording the sum as a first value; calculating the sum of the first time and the second time to be recorded as a second value; and calculating the ratio of the first value to the second value to obtain a second heat exchange capacity parameter value of the current wheel.
Optionally, the judging subunit is specifically configured to: comparing a second heat exchange capacity parameter value of the present round with the second threshold; if the second heat exchange capacity parameter value of the current round is smaller than the second threshold value, the current round of optimization opening operation stage is not executed; and if the second heat exchange capacity parameter value of the current round is greater than or equal to the second threshold value, executing the current round of optimal opening operation stage.
Optionally, the judging subunit is specifically configured to: comparing the second heat exchange capacity parameter value of the current round with the second heat exchange capacity parameter value of the previous round; if the second heat exchange capacity parameter value of the current round is smaller than the second heat exchange capacity parameter value of the previous round, the optimal opening operation stage of the current round is not executed; and if the second heat exchange capacity parameter value of the current round is larger than or equal to the second heat exchange capacity parameter value of the previous round, executing the optimized opening operation stage of the current round.
Optionally, the determining unit is specifically configured to: if the optimized opening degree operation stage is not executed under the current compressor operation frequency, determining the second opening degree as the optimal opening degree; and if the optimal opening degree operation stage is executed under the current compressor operation frequency, determining the opening degree in the previous round of optimal opening degree operation stage as the optimal opening degree.
Accordingly, the third control module 83 is specifically configured to: and regulating the oil quantity regulating part to the second opening degree to continuously run, or controlling the oil quantity regulating part to circularly execute the last round of optimal opening degree running stage.
The oil return control device can execute the oil return control method provided by the embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. Technical details which are not described in detail in the present embodiment can be referred to the oil return control method provided in the embodiment of the present invention.
Example IV
The present embodiment provides an air conditioner, including: the oil return control device according to the above embodiment.
Example five
The present embodiment provides a computer device including: a memory, a processor and a computer program stored on the memory and executable on the processor, which processor implements the steps of the method described in the above embodiments when it executes the computer program.
Example six
The present embodiment provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method described in the above embodiments.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (16)

1. An oil return control method, characterized by comprising:
under the current operating frequency of the compressor, an oil quantity adjusting part on an oil return pipeline is adjusted to a first opening degree, and the first opening degree is maintained to operate for a first time, so that the internal oil level of the compressor reaches the maximum safe oil level;
reducing the oil quantity regulating part to a second opening degree so as to ensure that the oil discharge quantity of the compressor is equal to the oil return quantity of the compressor;
determining an optimal opening according to the heat exchange capacity of the air conditioner, and controlling the oil quantity regulating component to continuously operate according to the optimal opening;
wherein, confirm the optimal aperture according to the heat transfer ability of air conditioner, include:
judging whether to execute the running stage of the optimal opening degree of the round according to the heat exchange capability of the air conditioner;
If not, determining the optimal opening according to whether an optimal opening operation stage is executed at the current compressor operation frequency;
if the oil quantity adjusting component is executed, controlling the oil quantity adjusting component to be in the optimal opening degree of the wheel for continuously operating for a second time so as to reduce the internal oil level of the compressor to the minimum safe oil level and finish the capacity optimal operating state; then, the oil quantity adjusting part is adjusted to the first opening degree and continuously operates for the first time so as to complete a reliable optimal operation state; then, judging whether to execute the next round of optimal opening operation stage according to the heat exchange capacity of the air conditioner;
and when the opening of the oil quantity adjusting part is an optimized opening, the oil discharge quantity of the compressor is larger than the oil return quantity of the compressor, and the optimized opening is smaller than the second opening.
2. The method of claim 1, further comprising, prior to adjusting the oil amount adjustment member on the oil return line to the first opening degree:
obtaining current preset parameters, wherein the preset parameters comprise: compressor operating frequency, suction temperature, suction pressure, discharge temperature, and discharge pressure;
and determining a first opening degree and a first time corresponding to the current preset parameters according to first pre-stored information, wherein when the opening degree of the oil quantity adjusting component is the first opening degree, the oil discharge quantity of the compressor is smaller than the oil return quantity of the compressor.
3. The method according to claim 1, characterized by further comprising, before lowering the oil amount adjusting means to the second opening degree:
obtaining current preset parameters, wherein the preset parameters comprise: compressor operating frequency, suction temperature, suction pressure, discharge temperature, and discharge pressure;
calculating according to the current preset parameters to obtain the current oil discharge amount of the compressor;
and calculating to obtain the second opening according to the current compressor oil discharge amount, the current compressor operating frequency and the current lubricating oil temperature, wherein when the opening of the oil quantity regulating part is the second opening, the compressor oil discharge amount is equal to the compressor oil return amount, and the second opening is smaller than the first opening.
4. The method according to claim 1, wherein determining whether to execute the present round of optimized opening degree operation phase according to the heat exchange capability of the air conditioner comprises:
determining the optimal opening degree of the round and the corresponding second time;
estimating an accumulated heat exchange capacity value corresponding to the second time when the oil quantity adjusting component is in the optimal opening degree of the current wheel and continuously running, and recording the accumulated heat exchange capacity value as a first heat exchange capacity parameter value of the current wheel;
Comparing a first heat exchange capacity parameter value of the current wheel with a first threshold, wherein the first threshold is an accumulated heat exchange capacity value corresponding to the fact that the oil quantity adjusting component is at the first opening for the first time;
if the first heat exchange capacity parameter value of the current round is smaller than the first threshold value, the current round of optimization opening operation stage is not executed;
and if the first heat exchange capacity parameter value of the current round is larger than or equal to the first threshold value, judging whether to execute the optimized opening operation phase of the current round according to the second heat exchange capacity parameter value and whether to execute the optimized opening operation phase at the current compressor operation frequency.
5. The method of claim 4, wherein determining the optimal opening of the present wheel comprises:
if the optimized opening operation stage is not executed under the current compressor operation frequency, determining the optimized opening of the present wheel according to the second opening, wherein the optimized opening of the present wheel is smaller than the second opening;
if the optimized opening operation stage is executed under the current compressor operation frequency, the preset opening is reduced on the basis of the optimized opening of the previous round, and the optimized opening of the current round is obtained.
6. The method of claim 4, wherein determining the second time corresponding to the optimal opening of the present wheel comprises:
and determining a second time corresponding to the current compressor oil discharge amount and the optimal opening of the present wheel according to the second pre-stored information.
7. The method of claim 4, wherein estimating the cumulative heat exchange capacity value corresponding to the oil amount adjustment component being in the optimal opening of the present wheel for the second time of continuous operation, as the first heat exchange capacity parameter value of the present wheel, comprises:
adjusting the oil quantity adjusting part to the optimal opening degree of the main wheel;
acquiring the heat exchange capacity of the oil quantity adjusting part when the oil quantity adjusting part is positioned at the optimal opening degree of the main wheel;
and calculating the integral sum of the heat exchange capacity and the second time to obtain a first heat exchange capacity parameter value of the round.
8. The method of claim 4, wherein determining whether to perform the present run-on-optimum phase based on the second heat exchange capacity parameter value and whether the run-on-optimum phase was performed at the current compressor operating frequency comprises:
estimating the average heat exchange capacity value of the optimized opening operation stage of the round, and taking the average heat exchange capacity value as a second heat exchange capacity parameter value of the round;
If the optimal opening operation stage is not executed under the current compressor operation frequency, judging whether to execute the optimal opening operation stage of the present round according to a second heat exchange capacity parameter value of the present round and a second threshold value, wherein the second threshold value is the heat exchange capacity of the oil quantity regulating component when the oil quantity regulating component is positioned at the second opening;
if the optimized opening operation stage is executed under the current compressor operation frequency, judging whether to execute the optimized opening operation stage of the current round according to the second heat exchange capacity parameter value of the current round and the second heat exchange capacity parameter value of the previous round.
9. The method of claim 8, wherein estimating the average heat exchange capacity value of the current round of optimized opening operation phase as the second heat exchange capacity parameter value of the current round comprises:
calculating the sum of the first heat exchange capacity parameter value of the current round and the first threshold value, and recording the sum as a first value;
calculating the sum of the first time and the second time to be recorded as a second value;
and calculating the ratio of the first value to the second value to obtain a second heat exchange capacity parameter value of the current wheel.
10. The method of claim 8, wherein determining whether to perform the run phase of the present round of optimal opening based on the second heat exchange capacity parameter value of the present round and a second threshold value comprises:
Comparing a second heat exchange capacity parameter value of the present round with the second threshold;
if the second heat exchange capacity parameter value of the current round is smaller than the second threshold value, the current round of optimization opening operation stage is not executed;
and if the second heat exchange capacity parameter value of the current round is greater than or equal to the second threshold value, executing the current round of optimal opening operation stage.
11. The method of claim 8, wherein determining whether to perform the run phase of the present round of optimized opening degree based on the second heat exchange capacity parameter value of the present round and the second heat exchange capacity parameter value of the previous round comprises:
comparing the second heat exchange capacity parameter value of the current round with the second heat exchange capacity parameter value of the previous round;
if the second heat exchange capacity parameter value of the current round is smaller than the second heat exchange capacity parameter value of the previous round, the optimal opening operation stage of the current round is not executed;
and if the second heat exchange capacity parameter value of the current round is larger than or equal to the second heat exchange capacity parameter value of the previous round, executing the optimized opening operation stage of the current round.
12. The method of claim 1, wherein determining the optimal opening based on whether an optimized opening run phase is performed at a current compressor operating frequency comprises:
If the optimized opening degree operation stage is not executed under the current compressor operation frequency, determining the second opening degree as the optimal opening degree;
if the optimized opening degree operation stage is executed under the current compressor operation frequency, determining the opening degree in the previous round of optimized opening degree operation stage as the optimal opening degree;
correspondingly, controlling the oil quantity adjusting part to continuously operate according to the optimal opening degree comprises the following steps: and regulating the oil quantity regulating part to the second opening degree to continuously run, or controlling the oil quantity regulating part to circularly execute the last round of optimal opening degree running stage.
13. An oil return control device, characterized by comprising:
the first control module is used for adjusting the oil quantity adjusting part on the oil return pipeline to a first opening degree under the current operating frequency of the compressor, and maintaining the first opening degree to operate for a first time so as to enable the internal oil level of the compressor to reach the maximum safe oil level;
the second control module is used for reducing the oil quantity adjusting part to a second opening degree so as to enable the oil discharge quantity of the compressor to be equal to the oil return quantity of the compressor;
the third control module is used for determining the optimal opening according to the heat exchange capacity of the air conditioner and controlling the oil quantity regulating component to continuously operate according to the optimal opening;
The third control module includes:
the judging unit is used for judging whether to execute the running stage of the optimal opening degree of the round according to the heat exchange capacity of the air conditioner;
a determining unit for determining the optimal opening according to whether an optimal opening operation phase is performed at a current compressor operation frequency if not;
the control unit is used for controlling the oil quantity adjusting part to be in the optimal opening degree of the wheel for continuously running for a second time if the oil quantity adjusting part is executed, so that the internal oil level of the compressor is reduced to the minimum safe oil level, and the capacity optimal running state is completed; then, the oil quantity adjusting part is adjusted to the first opening degree and continuously operates for the first time so as to complete a reliable optimal operation state; then, judging whether to execute the next round of optimal opening operation stage according to the heat exchange capacity of the air conditioner;
and when the opening of the oil quantity adjusting part is an optimized opening, the oil discharge quantity of the compressor is larger than the oil return quantity of the compressor, and the optimized opening is smaller than the second opening.
14. An air conditioner, comprising: the oil return control device according to claim 13.
15. A computer device, comprising: memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any one of claims 1 to 12 when the computer program is executed by the processor.
16. A non-transitory computer readable storage medium having stored thereon a computer program, characterized in that the computer program when executed by a processor implements the steps of the method of any of claims 1 to 12.
CN202210795118.2A 2022-07-07 2022-07-07 Oil return control method and device and air conditioner Active CN115200264B (en)

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