CN109539649B - Unit oil return control method and system and multi-split air conditioner - Google Patents
Unit oil return control method and system and multi-split air conditioner Download PDFInfo
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- CN109539649B CN109539649B CN201811470428.7A CN201811470428A CN109539649B CN 109539649 B CN109539649 B CN 109539649B CN 201811470428 A CN201811470428 A CN 201811470428A CN 109539649 B CN109539649 B CN 109539649B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/07—Details of compressors or related parts
- F25B2400/077—Compressor control units, e.g. terminal boxes, mounted on the compressor casing wall containing for example starter, protection switches or connector contacts
Abstract
The invention relates to a unit oil return control method, a system and a multi-split air conditioner, wherein the control method comprises the following steps: acquiring an outdoor temperature parameter in a unit working time period preset in a future period of time; obtaining the total oil return time required by the unit in the time period according to the obtained outdoor air temperature parameters; and before the preset unit working time period begins, starting an oil return mode in advance for not less than the total oil return time. The control method quantificationally calculates the total oil return time required in the preset unit working time period according to the weather parameters in a period of time in the future so as to accurately determine the timing of oil return in advance, thereby starting the oil return mode in advance, ensuring that the unit does not lack oil in the preset oil return prohibition time period, avoiding oil return or reducing the number of times of oil return in the preset unit working time period, and avoiding the frequent disturbance of users by oil return noise or uncomfortable feeling caused by excessive oil return frequency.
Description
Technical Field
The invention relates to the technical field of unit control, in particular to a unit oil return control method, a system and a multi-split air conditioner.
Background
The oil return of the unit is to ensure the normal work and heat dissipation of the compressor, and the unit (compressor) is worn or even burnt out due to poor oil return. When the unit is in an oil return mode, the compressor runs at or close to the highest frequency, and the noise caused by high-speed flow of the refrigerant is relatively high. Moreover, when most of multi-connected units return oil, no matter whether the internal units are in a starting state or not, the electronic expansion valves of all the internal units are opened, and the aim is to flush the refrigerant accumulated in the internal units back to the external machine side, so that the internal units which are shut down also generate noise to influence the rest or work of users, and the fluctuation of the unit capacity during oil return also brings uncomfortable feeling to the users.
At present, most of multi-split air conditioning units adopt timing oil return control, such as forced oil return for 1 time in 2 hours, the oil return procedure is simple and reliable, but the oil return in the mode is not accurate enough due to different working environments of units and variable outdoor working conditions, the working requirements of compressors cannot be met well, and the requirements of users on higher comfort are difficult to adapt.
Disclosure of Invention
The invention aims to provide a unit oil return control method, a system and a multi-split air conditioner, which can improve the comfort experience of users.
According to an aspect of the invention, a method for regulating and controlling oil return of a compressor is provided, which comprises the following steps:
acquiring an outdoor temperature parameter in a unit working time period preset in a future period of time;
obtaining the total oil return time required by the unit in the time period according to the obtained outdoor air temperature parameters;
before the preset unit working time period begins, the oil return mode is started in advance for not less than the total oil return time.
Further, the step of obtaining the outdoor air temperature parameter within the unit working time period preset for a future period of time specifically includes:
and acquiring the outdoor temperature parameter in the unit working time period preset in the future period from the weather forecast information.
Further, the step of obtaining the total oil return time required by the unit in the time period according to the obtained outdoor air temperature parameter specifically includes:
calculating the average air temperature in each unit time in the time period according to the acquired outdoor air temperature parameters;
calculating the temperature difference between the average air temperature in each unit time and a preset standard working condition;
obtaining the oil return time required by the unit in each unit time according to the temperature difference corresponding to each unit time;
and accumulating the oil return time required by each unit time to obtain the total oil return time required by the unit in the time period.
Further, the step of obtaining the oil return time required by the unit in each unit time according to the temperature difference in each unit time specifically includes:
acquiring oil return time required by unit time of a unit under a standard working condition;
and obtaining the oil return time required by the unit in each unit time according to the oil return time required by the unit in the standard working condition and the temperature difference in each unit time.
Further, in the cooling mode, before calculating the oil return time required by the unit in each unit time according to the temperature difference in each unit time, the method further includes:
and judging whether the temperature difference in each unit time is greater than or equal to a preset temperature threshold, if so, multiplying the temperature difference by a preset oil return correction coefficient when calculating the oil return time required by the corresponding unit time, wherein the preset oil return correction coefficient is greater than 1, otherwise, directly calculating through the temperature difference.
Furthermore, unit time is preset, after the preset unit working time period is divided according to the unit time, if the residual time period is less than the unit time, the oil return time required by the residual time period is calculated according to the unit time; or
The unit time is determined according to the preset unit working time period, so that the required oil return time is calculated by just dividing the preset unit working time period according to the unit time.
Further, the preset unit working time period includes at least two and is set at intervals, and before the oil return mode is started, the control method further includes:
calculating the time interval between two adjacent preset unit working time periods;
and judging whether the total oil return time required by the next preset unit working time period is greater than the time interval between the next preset unit working time period and the adjacent previous preset unit working time period, and if so, starting oil return before the adjacent previous preset unit working time period.
According to another aspect of the present invention, a unit oil return control system is provided, including:
the air temperature parameter acquisition module is used for acquiring outdoor air temperature parameters in a unit working time period preset in a future period of time;
the oil return time calculation module is used for obtaining the total oil return time required by the unit in the time period according to the obtained outdoor air temperature parameters; and
and the oil return starting control module is used for starting an oil return mode in advance for not less than the total oil return time before the preset unit working time period begins.
Furthermore, the temperature parameter acquisition module is a GPS communication module and is used for acquiring the outdoor temperature parameter within the unit working time period preset in a future period of time from the weather forecast information.
Further, the oil return time calculation module includes:
the average air temperature calculating module is used for calculating the average air temperature in each unit time in the time period according to the acquired outdoor air temperature parameters;
the temperature difference calculation module is used for calculating the temperature difference between the average air temperature in each unit time and a preset standard working condition;
the unit time oil return calculation module is used for obtaining the oil return time required by the unit in each unit time according to the temperature difference corresponding to each unit time; and
and the oil return time accumulation module is used for accumulating the oil return time required by each unit time to obtain the total oil return time required by the unit in the time period.
Further, the oil return time calculation module further comprises:
the standard working condition oil return acquisition module is used for acquiring oil return time required by the unit under the standard working condition;
the unit time oil return calculation module is used for obtaining the oil return time required by the unit in each unit time according to the oil return time required by the unit in the standard working condition and the temperature difference in each unit time.
Further, the oil return time calculation module further comprises:
the temperature difference judging module is used for judging whether the temperature difference in each unit time is greater than or equal to a preset temperature threshold value or not in the refrigeration mode; and
and the oil return correction module is used for multiplying the temperature difference by a preset oil return correction coefficient which is larger than 1 when the temperature difference in each unit time exceeds a preset temperature threshold value so as to calculate the oil return time required by the corresponding unit time.
Furthermore, unit time is preset, after the preset unit working time period is divided according to the unit time, if the residual time period is less than the unit time, the unit time oil return calculation module calculates the oil return time required by the residual time period according to the unit time; or
The unit time is determined according to the preset unit working time period, so that the required oil return time is calculated by just dividing the preset unit working time period according to the unit time.
Further, the preset unit working time period includes at least two and interval settings, and the control system further includes:
the time interval calculation module is used for calculating the time interval between two adjacent preset unit working time periods; and
and the oil return opportunity judgment module is used for judging whether the total oil return time required by the next preset unit working time period is greater than the time interval between the next preset unit working time period and the adjacent previous preset unit working time period or not, and enabling the oil return starting control module to start an oil return mode before the adjacent previous preset unit working time period under the condition of the total oil return time greater than the time interval.
According to another aspect of the invention, a multi-split air conditioner is provided, which comprises the unit oil return control system of the above embodiment.
Based on the technical scheme, the compressor oil return regulation control method disclosed by the embodiment of the invention quantificationally calculates the total oil return time required in the preset unit working time period according to the weather parameters in a period of time in the future so as to accurately determine the timing of oil return in advance, so that the oil return mode is started in advance, enough lubricating oil is stored in the unit compressor and in the oil storage facility in advance, and the unit cannot lack oil in the preset oil return prohibition time period, so that oil return can not be carried out or the number of times of oil return can be reduced in the preset unit working time period, and the phenomenon that a user is frequently disturbed by oil return noise or discomfort is caused by excessive oil return frequency when the user uses the compressor oil return regulation control method is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic flow chart diagram illustrating an embodiment of a compressor oil return regulation control method according to the present invention;
FIG. 2 is a schematic flow chart illustrating another embodiment of a compressor oil return regulation control method according to the present invention;
FIG. 3 is a schematic flow chart illustrating a method for controlling oil return regulation of a compressor according to an embodiment of the present invention;
fig. 4 is a functional composition schematic diagram of an embodiment of the oil return regulation control system of the compressor of the present invention.
Detailed Description
The present invention is described in detail below. In the following paragraphs, different aspects of the embodiments are defined in more detail. Aspects so defined may be combined with any other aspect or aspects unless clearly indicated to the contrary. In particular, any feature considered to be preferred or advantageous may be combined with one or more other features considered to be preferred or advantageous.
The terms "first", "second", and the like in the present invention are merely for convenience of description to distinguish different constituent elements having the same name, and do not denote a sequential or primary-secondary relationship.
The invention provides a compressor oil return regulation control method, which comprises the following steps in an exemplary embodiment, as shown in a flow chart shown in fig. 1:
102, obtaining the total oil return time required by the unit in the time period according to the obtained outdoor air temperature parameters;
and 103, before the preset unit working time period begins, starting an oil return mode in advance for not less than the total oil return time.
Wherein, the steps 101 to 103 are executed in sequence. The working time period of the unit preset in the step 101 can be set by a user, and can be set according to the working or resting habits of the user, for example, 9: 00-11: 30, 14: 00-17: 00 working; or setting 22: the 7:00 of the 00-next day is the sound sleep rest time, and the like, and the noise is not expected to be generated due to too much oil return frequency in the working or rest time periods, so that the comfort of the environment is improved. Outdoor air temperature parameters may be obtained for hours, days, or days in the future. The oil return of the unit can be pre-controlled by pre-obtaining the outdoor temperature parameter in the working time period of the unit.
In step 103, before the preset unit working time period starts, an oil return mode can be started in advance of the total oil return time, so that when the preset unit working time period is entered, oil return is just finished, and the whole working time span of the unit can be reduced; or the oil return mode can be started in advance for a time longer than the total oil return time, so that sufficient oil return can be ensured when the preset unit working time period is entered, and the oil return quantity requirement in the preset unit working time period can be met.
The control method of the embodiment of the invention quantificationally calculates the total oil return time required in the preset unit working time period according to the weather parameters in the next several hours so as to accurately determine the timing of oil return in advance, thereby starting the oil return mode in advance, leading enough lubricating oil to be stored in the unit compressor and the oil storage facility in advance, ensuring that the unit does not lack oil in the preset oil return prohibition time period, avoiding oil return or reducing the oil return times in the preset unit working time period, and avoiding the discomfort caused by the frequent disturbance of oil return noise or excessive oil return frequency when a user uses the oil-return-free air compressor. The control mode solves the problem of inaccurate oil return control and solves the problem of too many oil return frequencies of the unit in working or rest time.
In some embodiments, the step 101 of obtaining the outdoor air temperature parameter in the unit operating time period preset for a future period of time specifically includes:
and acquiring the outdoor temperature parameter in the unit working time period preset in the future period from the weather forecast information.
In this embodiment, a GPS communication module may be built in the unit to directionally receive the transmitted weather forecast information and transmit the temperature parameters to the control unit. The weather forecast can accurately forecast the time-sharing weather condition in a future period of time, the outdoor temperature parameter obtained from the weather forecast information can simply, quickly and accurately obtain the outdoor temperature parameter corresponding to the preset unit working time period, and the outdoor temperature parameter can be accurately obtained at lower cost.
In some embodiments, as shown in the flowchart of fig. 2, the step 102 of obtaining, according to the obtained outdoor air temperature parameter, a total oil return time required by the unit in the time period specifically includes:
and 204, accumulating the oil return time required by each unit time to obtain the total oil return time required by the unit in the time period.
Wherein, the steps 201 to 204 are executed in sequence.
In step 201, the unit time may be set according to the requirement, for example, half an hour, an hour or two hours, and the average air temperature Tour in each unit time in the following preset unit operation time period is calculated, for example, the average air temperature Tour1 of time from 9 today to 10 today is 36 ℃, and the average air temperature Tour2 of time from 10 today to 11 is 37 ℃ …
In step 202, the temperature difference between the average air temperature and the preset standard working condition in each unit time is calculated △ TC., and the temperature difference between the average air temperature and the preset standard working condition in each hour is calculated, wherein in the case of 9, △ TC1 is 36-35, and the temperature is 1 ℃, and in the case of 10, △ TC2 is 37-35, and the temperature is 2 ℃ ….
In step 203, calculating oil return time tourri required by the unit to operate in each unit time, wherein the unit min is calculated, the step uses the temperature difference between the predicted outdoor air temperature and the preset standard working condition of the unit as a basis for controlling the oil return time of the unit, and the larger the temperature difference is, the longer the oil return time required by the unit is. The standard working condition is a set test reference parameter listed in a specification, and different regions are slightly different. Here for reference parameter comparison. This value is a factory setting. For example, 35 ℃ may be selected for cooling and 7 ℃ may be selected for heating.
In step 204, the oil return time required by each unit time is accumulated to obtain the total oil return time required by the unit in the time period. Σ your 1+ ∑ your 2+ … Σ youri + ….
According to the embodiment, the preset unit working time period is divided into the plurality of unit times, the influence of outdoor air temperature change on the oil return time required by the compressor can be reflected, the total oil return time required in the preset unit working time period is accurately calculated according to the predicted outdoor air temperature, the timing of oil return in advance is accurately judged, and the phenomenon that a user is frequently disturbed by oil return noise or uncomfortable feeling is caused by excessive oil return frequency when the user uses the oil-return-type air compressor is avoided.
In some embodiments, as shown in the flowchart of fig. 3, the step 203 of obtaining the oil return time required by the unit in each unit time according to the temperature difference in each unit time specifically includes:
and step 203B, obtaining the oil return time required by the unit in each unit time according to the oil return time required by the unit in the standard working condition and the temperature difference in each unit time.
The corresponding relation between the operation time and the required oil return time of the unit under the preset standard working condition is a unit development parameter, the parameter is a parameter required by a developer to attach the unit and is measured based on an experiment, the parameter is a factory fixed value, the parameters can be the same or different under the conditions of cooling and heating, and no mandatory requirement is required in the step 203A.
In the above embodiment, for example, if the unit oil return required time Σ Tour1 is 10+1 is 11min in the period from 9 hours to 10 minutes; in the time period from 10 hours to 11 hours, the oil return time sigma Tour2 of the unit is 10+2 × 1 which is 12 min; Σ your 1+ ∑ your 2 ═ 11+12 ═ 23 min. If the unit is to ensure that 9: if the unit does not return oil within the working time of 00-11: 00, the oil return needs to be completed for 23min before 9:00, namely the unit starts an oil return mode at least before 8: 37.
In some embodiments, as shown in the flowchart of fig. 3, in the cooling mode, before calculating the oil return time required by the unit in each unit time according to the temperature difference in each unit time in step 203, the control method of the present invention further includes:
In the embodiment, the problem that the frequency reduction phenomenon exists when the unit returns oil if the outdoor environment temperature is too high in the refrigeration mode is considered, so that the oil return time corresponding to unit time is corrected. The total oil return time required in the preset unit working time period can be more accurately calculated by taking the influence of the outdoor environment temperature on the oil return frequency of the compressor into consideration.
Taking the multi-split air conditioner as an example, when the multi-split air conditioner system is used for high-temperature refrigeration (generally, the ambient temperature is more than 43 degrees, such as high-temperature areas in the middle east), because the system pressure is high, the exhaust temperature of the compressor is also increased, most units can run at low frequency for a long time due to the protection function, and at the moment, the more the lubricating oil in the pipeline and the inner machine side is accumulated.
In the oil return mode of the air conditioner, the refrigerant in the pipe is often brought back to the compressor side by the high-speed flow of the refrigerant in the cooling mode or when the compressor is operated at the highest frequency. However, the high pressure and high temperature in the pipe accompanied with high-temperature refrigeration mostly force the unit to reduce the frequency to realize self protection, if the frequency reduction amplitude is too large, the oil carrying capacity of the compressor under low frequency is weak, effective oil return cannot be realized, and the compressor is in an oil return mode for a long time to influence the indoor refrigeration effect; if the amplitude of the frequency reduction is too small, the high pressure and the high temperature in the system can not be effectively reduced, and the unit can be forced to stop or reduce the frequency again, so that the unit is stopped or reduced in the frequency for a long time, and efficient oil return can not be realized. Therefore, the oil return time required for high-temperature refrigeration is increased.
In the heating mode, this problem does not exist, and the oil return time required by the corresponding unit time can be calculated directly by the temperature difference when the step 203B is executed, without considering the size of the temperature difference.
In the above embodiments, the unit time can be set at least in two ways:
firstly, unit time is preset, after a preset unit working time period is divided according to the unit time, if the remaining time period is less than the unit time, oil return time required by the remaining time period is calculated according to the unit time. The control method is simple, and under the condition that the residual time period after separation is less than the unit time, the allowance is reserved during the calculation of the total oil return time, so that the oil of the unit is prevented from being deficient in the preset oil return forbidding time period, oil return can be prevented in the preset unit working time period, and the comfort feeling of a user is improved in the more important time period.
And secondly, the unit time is determined according to the preset unit working time period, so that the required oil return time is calculated by just dividing the preset unit working time period according to the unit time. The control mode can flexibly adjust the unit time according to the preset working time period of the unit so as to more accurately calculate the total oil return time and further adapt to the condition of less time available for oil return.
In some embodiments, the preset unit operation time period includes at least two and is set at intervals, and before the oil return mode is started, the control method further includes:
calculating a time interval T between two adjacent preset unit working time periods;
judging whether the total oil return time T2 required by the next preset unit working time period is greater than the time interval T between the next preset unit working time period and the previous preset unit working time period, if so, starting an oil return mode before the previous preset unit working time period; otherwise, the oil return mode can be started between two adjacent preset unit working time periods, and the oil return mode can also be started before the adjacent previous preset unit working time period.
Preferably, if T2> T, the oil return mode may be enabled at a time T1+ T2, or earlier, before the next previous preset crew operating period.
This embodiment can be when presetting a plurality of operating time quantum, judge in advance if the oil return again after a predetermined unit operating time quantum is accomplished, whether can satisfy the oil return demand of next predetermined unit operating time quantum, plan each predetermined unit operating time quantum overall, can not return the oil in predetermined unit operating time quantum, avoid the user to be disturbed by oil return noise or bring uncomfortable sensation because of oil return frequency is too much when using.
Further, as shown in the flowchart of fig. 3, the control method of the present invention further includes:
and step 100, setting the working time period of the unit. The user can change the time quantum of setting at any time, to the user that work or rest time are comparatively fixed, can set for every day, also can carry out once and set for and pre-exist in the unit.
Next, the present invention further provides a unit oil return control system, and in some embodiments, as shown in fig. 4, the control system includes:
the air temperature parameter acquisition module 10 is used for acquiring outdoor air temperature parameters in a unit working time period preset in a future period of time;
the oil return time calculation module 20 is used for obtaining the total oil return time required by the unit in the time period according to the obtained outdoor air temperature parameters; and
and the oil return starting control module 30 is used for starting an oil return mode in advance of the total oil return time before the preset unit working time period begins.
The control system can quantitatively calculate the total oil return time required in the preset unit working time period according to the weather parameters in a period of time in the future so as to accurately determine the timing of oil return in advance, thereby starting the oil return mode in advance, ensuring that the unit does not lack oil in the preset oil return prohibition time period, avoiding oil return or reducing the number of times of oil return in the preset unit working time period, and avoiding the frequent disturbance of users by oil return noise or uncomfortable feeling caused by excessive oil return frequency.
In some embodiments, the air temperature parameter obtaining module 10 is a GPS communication module, and is configured to obtain, from the weather forecast information, the outdoor air temperature parameter within a unit working time period preset in a future period. The GPS communication module can directionally receive the transmitted weather forecast information and transmit the temperature parameters to the oil return time calculation module.
The weather forecast can accurately forecast the time-sharing weather condition in a future period of time, the outdoor temperature parameter obtained from the weather forecast information can simply, quickly and accurately obtain the outdoor temperature parameter corresponding to the preset unit working time period, and the outdoor temperature parameter can be accurately obtained at lower cost.
In some embodiments, the oil return time calculation module 20 includes:
the average air temperature calculating module is used for calculating the average air temperature in each unit time in the time period according to the acquired outdoor air temperature parameters;
the temperature difference calculation module is used for calculating the temperature difference between the average air temperature in each unit time and a preset standard working condition;
the unit time oil return calculation module is used for obtaining the oil return time required by the unit in each unit time according to the temperature difference corresponding to each unit time; and
and the oil return time accumulation module is used for accumulating the oil return time required by each unit time to obtain the total oil return time required by the unit in the time period.
According to the embodiment, the preset unit working time period is divided into the plurality of unit times, the influence of outdoor air temperature change on the oil return time required by the compressor can be reflected, the total oil return time required in the preset unit working time period is accurately calculated according to the predicted outdoor air temperature, the timing of oil return in advance is accurately judged, and the phenomenon that a user is frequently disturbed by oil return noise or uncomfortable feeling is caused by excessive oil return frequency when the user uses the oil-return-type air compressor is avoided.
Further, the oil return time calculation module 20 may further include:
the standard working condition oil return acquisition module is used for acquiring oil return time required by the unit under a preset standard working condition;
the unit time oil return calculation module is used for obtaining the oil return time required by the unit in each unit time according to the oil return time required by the unit in the standard working condition and the temperature difference in each unit time.
In some embodiments, the oil return time calculation module 20 may further include:
the temperature difference judging module is used for judging whether the temperature difference in each unit time is greater than or equal to a preset temperature threshold value or not in the refrigeration mode; and
and the oil return correction module is used for multiplying the temperature difference by a preset oil return correction coefficient which is larger than 1 when the temperature difference in each unit time exceeds a preset temperature threshold value so as to calculate the oil return time required by the corresponding unit time.
In the embodiment, the problem that the frequency reduction phenomenon exists when the unit returns oil if the outdoor environment temperature is too high in the refrigeration mode is considered, so that the oil return time corresponding to unit time is corrected. The total oil return time required in the preset unit working time period can be more accurately calculated by taking the influence of the outdoor environment temperature on the oil return frequency of the compressor into consideration.
For the above embodiment, two determination methods can be adopted for the unit time:
firstly, unit time is preset, after a preset unit working time period is divided according to the unit time, if the remaining time period is less than the unit time, the unit time oil return calculation module calculates the oil return time required by the remaining time period according to the unit time.
And secondly, the unit time is determined according to the preset unit working time period, so that the required oil return time is calculated by just dividing the preset unit working time period according to the unit time.
In some embodiments, the preset unit operation time period includes at least two and is set at intervals, and the control system further includes:
the time interval calculation module is used for calculating the time interval between two adjacent preset unit working time periods; and
and the oil return opportunity judgment module is used for judging whether the total oil return time required by the next preset unit working time period is greater than the time interval between the next preset unit working time period and the adjacent previous preset unit working time period or not, and enabling the oil return starting control module to start an oil return mode before the adjacent previous preset unit working time period under the condition of the total oil return time greater than the time interval.
Finally, the invention also provides a multi-split air conditioner, which comprises the unit oil return control system of the embodiment. When the multi-split air conditioner is in oil return, the electronic expansion valves of all the internal machines are opened no matter whether the internal machines are in a starting state or not so as to flush the stored refrigerants inside the internal machines back to the external machine side, and therefore after the multi-split air conditioner is shut down, each internal machine can generate large noise, besides normal control, the multi-split air conditioner also adopts an oil return control mode based on weather prediction, oil return time can be accurately staggered with the working time of the multi-split air conditioner, and comfort level experience of users is improved.
The method, the system and the multi-split air conditioner for controlling the oil return of the unit provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to aid in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (13)
1. A compressor oil return regulation control method is characterized by comprising the following steps:
acquiring an outdoor temperature parameter in a unit working time period preset in a future period of time;
obtaining the total oil return time required by the unit in the time period according to the obtained outdoor air temperature parameters;
before a preset unit working time period begins, starting an oil return mode in advance for not less than the total oil return time;
the step of obtaining the total oil return time required by the unit in the time period according to the obtained outdoor air temperature parameters specifically comprises the following steps:
calculating the average air temperature in each unit time in the time period according to the acquired outdoor air temperature parameters;
calculating the temperature difference between the average air temperature in each unit time and a preset standard working condition;
obtaining the oil return time required by the unit in each unit time according to the temperature difference corresponding to each unit time;
and accumulating the oil return time required by each unit time to obtain the total oil return time required by the unit in the time period.
2. The compressor oil return regulation and control method according to claim 1, wherein the step of obtaining the outdoor air temperature parameter within the unit working time period preset for a future period of time specifically comprises:
and acquiring the outdoor temperature parameter in the unit working time period preset in the future period from the weather forecast information.
3. The compressor oil return regulation control method according to claim 1, wherein the step of obtaining the oil return time required by the unit in each unit time according to the temperature difference in each unit time specifically comprises:
acquiring oil return time required by the unit time under the preset standard working condition;
and obtaining the oil return time required by the unit in each unit time according to the oil return time required by the unit in the unit time under the preset standard working condition and the temperature difference in each unit time.
4. The oil return regulation and control method for the compressor as claimed in claim 1, further comprising, in the cooling mode, before calculating the oil return time required by the unit in each unit time according to the temperature difference in each unit time, the following steps:
and judging whether the temperature difference in each unit time is greater than or equal to a preset temperature threshold, if so, multiplying the temperature difference by a preset oil return correction coefficient when calculating the oil return time required by the corresponding unit time, wherein the preset oil return correction coefficient is greater than 1, otherwise, directly calculating through the temperature difference.
5. The compressor oil return regulation and control method according to claim 1, wherein the unit time is preset, and after the preset unit operation time period is divided according to the unit time, if the remaining time period is less than the unit time, the oil return time required by the remaining time period is calculated according to the unit time; or
And the unit time is determined according to the preset unit working time period, so that the required oil return time is calculated by dividing the preset unit working time period just according to the unit time.
6. The compressor oil return regulation control method according to claim 1, wherein the preset unit operation time period includes at least two and is set at intervals, and before the oil return mode is started, the control method further includes:
calculating the time interval between two adjacent preset unit working time periods;
and judging whether the total oil return time required by the next preset unit working time period is greater than the time interval between the next preset unit working time period and the adjacent previous preset unit working time period, and if so, starting an oil return mode before the adjacent previous preset unit working time period.
7. A unit oil return control system is characterized by comprising:
the air temperature parameter acquisition module (10) is used for acquiring outdoor air temperature parameters in a unit working time period preset in a future period of time;
the oil return time calculation module (20) is used for obtaining the total oil return time required by the unit in the time period according to the obtained outdoor air temperature parameters; and
the oil return starting control module (30) is used for starting an oil return mode in advance of the total oil return time before the preset unit working time period begins;
wherein the oil return time calculation module (20) comprises:
the average air temperature calculating module is used for calculating the average air temperature in each unit time in the time period according to the acquired outdoor air temperature parameters;
the temperature difference calculation module is used for calculating the temperature difference between the average air temperature in each unit time and a preset standard working condition;
the unit time oil return calculation module is used for obtaining the oil return time required by the unit in each unit time according to the temperature difference corresponding to each unit time; and
and the oil return time accumulation module is used for accumulating the oil return time required by each unit time to obtain the total oil return time required by the unit in the time period.
8. The unit oil return control system according to claim 7, wherein the air temperature parameter obtaining module (10) is a GPS communication module, and is configured to obtain, from weather forecast information, an outdoor air temperature parameter within a unit working time period preset for a future period of time.
9. The unit oil return control system according to claim 7, wherein the oil return time calculation module (20) further comprises:
the standard working condition oil return acquisition module is used for acquiring oil return time required by the unit under the preset standard working condition;
the unit time oil return calculation module is used for obtaining the oil return time required by the unit in each unit time according to the oil return time required by the unit in the unit time under the preset standard working condition and the temperature difference in each unit time.
10. The unit oil return control system according to claim 7, wherein the oil return time calculation module (20) further comprises:
the temperature difference judging module is used for judging whether the temperature difference in each unit time is greater than or equal to a preset temperature threshold value or not in the refrigeration mode; and
and the oil return correction module is used for multiplying the temperature difference by a preset oil return correction coefficient which is more than 1 when the temperature difference in each unit time exceeds a preset temperature threshold value so as to calculate the oil return time required by the corresponding unit time.
11. The unit oil return control system according to claim 7, wherein the unit time is preset, and after the preset unit working time period is divided according to the unit time, if the remaining time period is less than the unit time, the unit time oil return calculation module calculates the oil return time required by the remaining time period according to the unit time; or
And the unit time is determined according to the preset unit working time period, so that the required oil return time is calculated by dividing the preset unit working time period just according to the unit time.
12. The unit oil return control system according to claim 7, wherein the preset unit operation time period includes at least two and is set at intervals, the control system further includes:
the time interval calculation module is used for calculating the time interval between two adjacent preset unit working time periods; and
and the oil return opportunity judgment module is used for judging whether the total oil return time required by the next preset unit working time period is greater than the time interval between the next preset unit working time period and the adjacent previous preset unit working time period or not, and enabling the oil return starting control module (30) to start an oil return mode before the adjacent previous preset unit working time period under the condition of the total oil return time greater than the time interval.
13. A multi-split air conditioner characterized by comprising the unit oil return control system as claimed in any one of claims 7 to 12.
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| CN201811470428.7A CN109539649B (en) | 2018-12-04 | 2018-12-04 | Unit oil return control method and system and multi-split air conditioner |
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| CN110285544B (en) * | 2019-07-05 | 2020-07-28 | 珠海格力电器股份有限公司 | Oil return control method, device and system of temperature adjusting equipment and air conditioner |
| CN111023416B (en) * | 2019-12-24 | 2021-08-24 | 宁波奥克斯电气股份有限公司 | Oil return control method and device and multi-split air conditioner |
| CN110986430B (en) * | 2019-12-31 | 2020-11-10 | 珠海格力电器股份有限公司 | Effective oil return control method and device and air conditioning unit |
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| JPH0972622A (en) * | 1995-09-06 | 1997-03-18 | Denso Corp | Freezing device |
| JP5484930B2 (en) * | 2010-01-25 | 2014-05-07 | 三菱重工業株式会社 | Air conditioner |
| CN103162469B (en) * | 2011-12-19 | 2015-01-07 | 珠海格力电器股份有限公司 | Method and device of oil return control of air conditioner and air conditioner |
| CN105588384B (en) * | 2014-12-10 | 2018-03-16 | 海信（山东）空调有限公司 | The method for controlling oil return and device of a kind of frequency converting air-conditioner compressor |
| CN106369879B (en) * | 2015-07-23 | 2019-10-22 | 青岛海尔空调电子有限公司 | A kind of multi-line system method for controlling oil return and device |
| CN105371531B (en) * | 2015-11-30 | 2018-02-09 | 珠海格力电器股份有限公司 | The low frequency method for controlling oil return and system of air conditioner |
| CN106091479B (en) * | 2016-06-16 | 2018-06-01 | 珠海格力电器股份有限公司 | Air conditioner and its method for controlling oil return and device |
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