CN113531841B - Variable-frequency air conditioner oil return control method and device, electronic equipment and medium - Google Patents
Variable-frequency air conditioner oil return control method and device, electronic equipment and medium Download PDFInfo
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- CN113531841B CN113531841B CN202110721968.3A CN202110721968A CN113531841B CN 113531841 B CN113531841 B CN 113531841B CN 202110721968 A CN202110721968 A CN 202110721968A CN 113531841 B CN113531841 B CN 113531841B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The application discloses a variable frequency air conditioner oil return control method, a variable frequency air conditioner oil return control device, electronic equipment and a medium. The method comprises the following steps: under the condition that the variable-frequency air conditioner enters an oil return mode, the current frequency of the compressor is adjusted to a preset oil return frequency to work; acquiring a room temperature and humidity requirement, namely acquiring an air outlet temperature and humidity requirement of the variable frequency air conditioner, wherein the room temperature and humidity requirement is used for representing a first regulation force required by deviation of the current temperature and humidity of a room corresponding to the variable frequency air conditioner and the expected temperature and humidity, and the air outlet temperature and humidity requirement is used for representing a second regulation force required by deviation of the current air outlet temperature and humidity of the variable frequency air conditioner and the air outlet temperature and humidity of the variable frequency air conditioner before oil return; and during the period that the variable-frequency air conditioner is in the oil return mode, performing temperature and humidity compensation operation according to the room temperature and humidity requirement and the air outlet temperature and humidity requirement control of the variable-frequency air conditioner.
Description
Technical Field
The invention relates to the technical field of variable frequency air conditioners, in particular to a variable frequency air conditioner oil return control method, a variable frequency air conditioner oil return control device, electronic equipment and a medium.
Background
The air conditioning system used in some occasions has very high requirements on the precision, stability and the like of temperature and humidity. Variable frequency air conditioners such as ultra-high precision laboratories strictly require a range of allowable fluctuations in temperature and relative humidity.
At present, the air conditioner in the laboratory generally adopts a variable frequency compressor so as to achieve the purposes of energy conservation, environmental protection and linear control. When the variable frequency compressor runs in a low frequency band for a long time, the risk of unsmooth oil return and poor lubrication exists, and then the abrasion failure of a moving part of the compressor is caused. Therefore, most variable frequency compressors are provided with oil return control logic to alleviate and avoid the problems. For example, after the compressor is continuously operated for 3 hours, the operation is carried out for 5 minutes at 60 revolutions per second, and then the compressor is restored to be adjusted according to the requirements.
However, the precision and stability of temperature and humidity control are seriously affected in the oil return process of the compressor, the refrigerating capacity and the dehumidifying capacity of the system are sharply enhanced when the oil is returned, and the treated air is sent into a room through an air duct and is mixed and circulated and returned into a variable-frequency air conditioner unit, so that feedback is delayed, and load balance and the temperature and humidity stability of the current room are damaged.
Disclosure of Invention
The application provides a variable frequency air conditioner oil return control method, device, electronic equipment and medium, which can solve the problem of temperature and humidity fluctuation caused by oil return operation of a compressor in a variable frequency air conditioner.
In a first aspect, a method for controlling oil return of a variable frequency air conditioner is provided, including:
under the condition that the variable-frequency air conditioner enters an oil return mode, the current frequency of the compressor is adjusted to a preset oil return frequency to work;
acquiring a room temperature and humidity requirement, namely acquiring an air outlet temperature and humidity requirement of the variable frequency air conditioner, wherein the room temperature and humidity requirement is used for representing a first regulation force required by deviation of the current temperature and humidity of a room corresponding to the variable frequency air conditioner and the expected temperature and humidity, and the air outlet temperature and humidity requirement is used for representing a second regulation force required by deviation of the current air outlet temperature and humidity of the variable frequency air conditioner and the air outlet temperature and humidity of the variable frequency air conditioner before oil return;
and during the period that the variable-frequency air conditioner is in the oil return mode, performing temperature and humidity compensation operation according to the room temperature and humidity requirement and the air outlet temperature and humidity requirement control of the variable-frequency air conditioner.
In a second aspect, a variable frequency air conditioner oil return control device is provided, including:
the calculation module is used for acquiring room temperature and humidity requirements under the condition that the variable frequency air conditioner enters an oil return mode, acquiring air outlet temperature and humidity requirements of the variable frequency air conditioner, wherein the room temperature and humidity requirements are used for representing first adjustment force required by deviation of current temperature and humidity and expected temperature and humidity of a room corresponding to the variable frequency air conditioner, and the air outlet temperature and humidity requirements are used for representing second adjustment force required by deviation of current air outlet temperature and humidity of the variable frequency air conditioner and air outlet temperature and humidity of the variable frequency air conditioner before oil return;
The control module is used for adjusting the current frequency of the compressor to a preset oil return frequency;
and the control module is also used for controlling the temperature and humidity compensation operation according to the room temperature and humidity requirement and the air outlet temperature and humidity requirement of the variable-frequency air conditioner during the oil return mode of the variable-frequency air conditioner.
In a third aspect, there is provided an electronic device comprising a memory and a processor, the memory storing a computer program that, when executed by the processor, causes the processor to perform the steps as in the first aspect and any one of its possible implementations.
In a fourth aspect, there is provided a computer storage medium storing one or more instructions adapted to be loaded by a processor and to perform the steps of the first aspect and any one of its possible implementations described above.
According to the method, under the condition that the variable frequency air conditioner enters an oil return mode, a room temperature and humidity requirement is obtained, an air outlet temperature and humidity requirement of the variable frequency air conditioner is obtained, the room temperature and humidity requirement is used for representing first adjusting force required by deviation of the current temperature and humidity of a room corresponding to the variable frequency air conditioner and the expected temperature and humidity, and the air outlet temperature and humidity requirement is used for representing second adjusting force required by deviation of the current air outlet temperature and humidity of the variable frequency air conditioner and the air outlet temperature and humidity of the variable frequency air conditioner before oil return; the current frequency of the compressor is adjusted to a preset oil return frequency; and during the oil return mode of the variable frequency air conditioner, performing temperature and humidity compensation operation according to the room temperature and humidity requirement and the air outlet temperature and humidity requirement control of the variable frequency air conditioner, and adaptively increasing an auxiliary heat source to adjust the ambient temperature according to the room temperature and humidity requirement and the air outlet temperature and humidity requirement so as to offset temperature and humidity fluctuation brought by oil return operation of the compressor, set temperature and humidity are achieved, and more precise temperature and humidity control of the variable frequency air conditioner is realized.
Drawings
In order to more clearly describe the technical solutions in the embodiments or the background of the present application, the following description will describe the drawings that are required to be used in the embodiments or the background of the present application.
Fig. 1 is a schematic flow chart of a method for controlling oil return of a variable frequency air conditioner according to an embodiment of the present application;
fig. 2 is a schematic flow chart of another method for controlling oil return of a variable frequency air conditioner according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an oil return control device of a variable frequency air conditioner according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
In order to make the present application solution better understood by those skilled in the art, the following description will clearly and completely describe the technical solution in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The terms first, second and the like in the description and in the claims of the present application and in the above-described figures, are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Embodiments of the present application are described below with reference to the accompanying drawings in the embodiments of the present application.
Referring to fig. 1, fig. 1 is a schematic flow chart of an oil return control method of a variable frequency air conditioner according to an embodiment of the present application. The method may include:
101. and under the condition that the variable-frequency air conditioner enters an oil return mode, the current frequency of the compressor is adjusted to a preset oil return frequency to work.
The variable frequency air conditioner oil return control method can be applied to a variable frequency air conditioner oil return control device, and the variable frequency air conditioner oil return control device can be electronic equipment such as a variable frequency air conditioner, for example, a variable frequency air conditioner applied to a laboratory scene or a high-precision air conditioner. The variable-frequency air conditioner comprises a variable-frequency compressor, and can further comprise a condenser, a liquid storage device, an expansion valve, an evaporator and other constituent elements, and a main control system of the system for regulating and controlling all the elements.
In the running process of the variable frequency air conditioner (air conditioner), part of lubricating oil in the compressor circularly flows along with the refrigerant in the variable frequency air conditioner system. When the compressor runs at low frequency, the internal circulation flow of the system is small, the flow rate of the refrigerant is reduced, lubricating oil in the refrigerant is deposited in parts such as a heat exchanger, a gas-liquid separator, a pipeline and the like under the influence of gravity, so that the compressor works in an oil-deficient state, and the compressor is worn, a motor is burnt and other consequences are caused. Therefore, it is necessary to forcibly raise the frequency of the compressor to return the oil to the inside of the compressor, which is called an oil return operation of the inverter air conditioner.
However, the accuracy and stability of temperature and humidity control are affected in the oil return process of the compressor, the refrigerating capacity and the dehumidifying capacity of the system are rapidly enhanced during oil return in general, and the treated air is sent into a room through an air duct and is mixed and circulated to return to a variable frequency air conditioner unit, so that feedback is delayed, and load balance and temperature and humidity stability are damaged. In this embodiment of the present application, specific compensation control logic may be executed when the variable frequency air conditioner enters the oil return mode, as shown in step 102 and step 103, so as to compensate for the temperature and the humidity, which may solve the above problem.
In one embodiment, before the step 101, the method may further include:
Acquiring continuous accumulated time length when the running frequency of the compressor of the variable-frequency air conditioner is smaller than a first preset frequency;
judging whether the continuous accumulated time length is smaller than a preset time length threshold value or not;
and if the temperature is not less than the preset temperature, controlling the variable-frequency air conditioner to enter the oil return mode.
Specifically, the operating frequency of the compressor may be monitored, and a continuous cumulative duration of time when the operating frequency of the compressor is less than a first preset frequency may be recorded. It can be understood that when the operation frequency of the compressor is smaller than a certain preset frequency and the continuous operation time in the state reaches a preset time threshold, the variable-frequency air conditioner is judged to need to return oil, and the current frequency of the compressor can be adjusted to the preset oil return frequency to work after the variable-frequency air conditioner enters the oil return mode. The first preset frequency, the preset duration threshold value and the preset oil return frequency can be set according to needs, which is not limited in the embodiment of the present application.
102. The method comprises the steps of obtaining room temperature and humidity requirements, obtaining air outlet temperature and humidity requirements of the variable-frequency air conditioner, wherein the room temperature and humidity requirements are used for representing first adjustment force required by deviation of current temperature and humidity and expected temperature and humidity of a room corresponding to the variable-frequency air conditioner, and the air outlet temperature and humidity requirements are used for representing second adjustment force required by deviation conditions of current air outlet temperature and humidity of the variable-frequency air conditioner and air outlet temperature and humidity of the variable-frequency air conditioner before oil return.
After entering the oil return mode, the deviation of the current temperature and the expected temperature and humidity can be considered to correspondingly compensate the temperature and humidity so that the current temperature and the current humidity reach the expected values. In the oil return mode in the embodiment of the present application, step 102 and step 103 may be performed periodically. The current temperature is the real-time temperature of the current room regulated by the variable-frequency air conditioner, and the expected temperature is the set temperature, namely the temperature to which the current room needs to be regulated. The adjusting force refers to the working strength of an element for heating and humidifying compensation.
In this embodiment of the present application, greenhouse degree deviation in two aspects may be considered, including the above-mentioned room temperature and humidity requirement and the air-out temperature and humidity requirement, measure the deviation of current humiture and anticipated humiture of room and the deviation of current air-out temperature and humidity of variable frequency air conditioner and the air-out temperature and humidity of above-mentioned variable frequency air conditioner before the oil return respectively. The room temperature and humidity requirement is used for guaranteeing that the temperature and humidity gradually reaches an expected value and the accuracy is guaranteed, but is influenced by the position of a sampling point, an engineering air duct and the like, certain hysteresis exists in the requirement, and the air outlet temperature and humidity requirement can avoid large oscillation in the oil return process, or the output capacity of the variable-frequency air conditioner is seriously mismatched with the room load, the requirement can be rapidly responded to change, the output of related devices is adjusted, and the stability is guaranteed.
When the variable frequency air conditioner enters the oil return mode, the variable frequency air conditioner is controlled according to the temperature and humidity requirements of a room and the temperature and humidity requirements of air outlet. The demand calculation and control in the embodiment of the application can adopt a closed-loop control algorithm, and the closed-loop control is a control mode of correcting according to the output feedback of the control object, and corrects according to the quota or standard when the deviation between the actual and the planned is measured. For example, by controlling the rotational speed of a motor, a sensor for measuring the rotational speed is obtained and the result is fed back to the control line. In an alternative embodiment, PID control algorithms may be employed, with PIDs being abbreviations for proportional (project), integral (integrate), derivative (Differential coefficient), representing three control algorithms, respectively. The deviation of the controlled object can be effectively corrected through the combination of the three algorithms, so that the controlled object can reach a stable state.
PID calculation is carried out on the room temperature and humidity requirements according to the collected current temperature and humidity of the room and the expected temperature and humidity, so that deviation situations of the current temperature and the expected temperature and humidity are represented, namely, the smaller the room temperature and humidity requirements are, the better the temperature and humidity control situation is; the PID calculation is carried out on the current air-out temperature and humidity of the collected variable-frequency air conditioner and the air-out temperature and humidity before oil return, so that the stability of the output capacity of the variable-frequency air conditioner during oil return operation is controlled.
In one embodiment, the room temperature and humidity requirement includes a room temperature requirement and a room humidity requirement, and the acquiring the room temperature and humidity requirement includes:
acquiring the current temperature and the current humidity of a room corresponding to the variable-frequency air conditioner, acquiring the preset expected temperature and the preset expected humidity of the room, calculating according to the current temperature and the preset temperature of the room corresponding to the variable-frequency air conditioner to acquire the room temperature requirement, and calculating according to the current humidity and the preset humidity of the room corresponding to the variable-frequency air conditioner to acquire the room humidity requirement. The specific calculation method can comprise the following steps:
calculating a first difference or a first ratio of the current temperature to the expected temperature, adjusting the first difference or the first ratio by using a first ratio coefficient, and calculating to obtain the room temperature requirement; and calculating a second difference or a second ratio of the current humidity to the expected humidity, adjusting the second difference or the second ratio by adopting a second proportionality coefficient, and calculating to obtain the room humidity requirement.
The current temperature of the room can be acquired through an indoor temperature sensor, the current humidity can be acquired through an indoor humidity sensor, and optionally, an integrated room temperature and humidity probe can be adopted for acquiring temperature and humidity values. The arrangement position of the room temperature and humidity probe is related to the type of the variable frequency air conditioner, engineering installation standards and the like, and the embodiment of the application does not limit the arrangement position.
Specifically, the room temperature demand is calculated by calculating the difference or ratio between the current temperature and the expected temperature, the greater the difference, the greater the demand, the greater the required adjustment force, and the greater the difference between the ratio and "1", the greater the demand, the greater the required adjustment force. Optionally, a scaling factor may be set as needed, and the obtained difference or ratio may be adjusted. The smaller the proportionality coefficient, the smaller the control effect and the slower the system response; conversely, the greater the scaling factor, the greater the control, and the faster the system response. However, the excessive scaling factor generally causes the system to generate larger overshoot and oscillation, resulting in poor stability performance of the system. Therefore, the proportion coefficient cannot be selected too much, and can be selected in a compromise mode according to the characteristics of the controlled object, so that the static difference of the system is controlled within an allowable range, and the response speed is high.
In an embodiment, the air outlet temperature and humidity requirement includes an air outlet temperature requirement and an air outlet humidity requirement, and the obtaining the air outlet temperature and humidity requirement of the variable frequency air conditioner includes:
the method comprises the steps of obtaining the air outlet temperature and the air outlet humidity of the variable frequency air conditioner before oil return, obtaining the current air outlet temperature and the current air outlet humidity of the variable frequency air conditioner, obtaining the air outlet temperature requirement according to the air outlet temperature and the current air outlet temperature of the variable frequency air conditioner before oil return, and obtaining the air outlet rheumatism requirement according to the air outlet humidity and the current air outlet rheumatism of the variable frequency air conditioner before oil return. The specific calculation method can comprise the following steps:
Calculating a third difference or a third ratio of the air outlet temperature before oil return and the current air outlet temperature, adjusting the third difference or the third ratio by adopting a third proportionality coefficient, and calculating to obtain the air outlet temperature requirement; and calculating a fourth difference value or a fourth ratio of the air-out humidity before oil return and the current air-out humidity, adjusting the fourth difference value or the fourth ratio by adopting a fourth proportionality coefficient, and calculating to obtain the air-out humidity requirement.
In the embodiment of the application, the air outlet temperature and the air outlet rheumatism degree can be acquired through the sensor at the air outlet position, for example, an air outlet temperature and humidity probe can be arranged at the air outlet of the variable-frequency air conditioner.
Similarly, for a specific calculation manner of the temperature and humidity requirement of the air outlet, reference may be made to the foregoing description of the calculation manner of the temperature and humidity requirement of the room, which is not repeated herein.
Alternatively, the same or different scaling factors may be set for different types of parameter control, e.g. calculations for temperature demand and humidity demand may be adjusted using different scaling factors.
The degree of adjustment of the compensation can be further determined by the calculated demand and a compensation control operation for the temperature and/or humidity can be performed accordingly.
103. And during the period that the variable-frequency air conditioner is in the oil return mode, performing temperature and humidity compensation operation according to the room temperature and humidity requirement and the air outlet temperature and humidity requirement control of the variable-frequency air conditioner.
In the oil return process, the refrigerating capacity and the dehumidifying capacity of the system are rapidly enhanced, and the auxiliary compensation of the heating element and the humidifying element is realized, so that the output capacity of the system and the load balance of a room are achieved, and further more precise temperature and humidity control is realized. The heating element may include a mechanical device for converting electric energy into heat energy, such as PTC, an electric heating tube, etc., and the humidifying element may include a humidifying device such as electrode humidification, infrared humidification, wet film humidification, ultrasonic humidification, etc., which is not limited in this embodiment of the present application.
Conventionally, the variable frequency air conditioner can calculate the requirement according to the collected room temperature and humidity and set temperature and humidity so as to perform temperature and humidity compensation, and specifically can control the opening of the heating element, the humidifying element and other devices to perform temperature and humidity compensation. The compressor is increased or decreased to the oil return frequency at a certain speed when entering the oil return mode, and the compressor runs constantly and continuously, and the heating element and the humidifying element are synchronously started and compensated according to the temperature and humidity requirements of a room and the temperature and humidity requirements of the air outlet.
In one embodiment, the step 103 may include:
if the room temperature requirement indicates that the first adjusting force is zero, determining a target temperature adjusting force of the heating element corresponding to the air outlet temperature requirement according to a mapping relation between the preset air outlet temperature requirement and the temperature adjusting force of the heating element;
if the room temperature requirement indicates that the first adjusting force is not zero, determining a target temperature adjusting force of the heating element under the room temperature requirement and the air outlet temperature requirement according to a mapping relation of the preset room temperature requirement, the air outlet temperature requirement and the temperature adjusting force of the heating element;
controlling the heating element to work with the target temperature adjusting force.
Specifically, the adjusting compensation control method for the heating element according to the temperature requirement in the embodiment of the application comprises two aspects.
On the one hand, if the room temperature requirement indicates that the first adjustment force is zero, that is, the calculated difference between the current temperature and the expected temperature of the room is 0 (or the ratio is 1), the corresponding adjustment force is 0, which indicates that the current temperature of the room has reached the expected temperature, and is in a steady state equilibrium state, and after entering the oil return mode, the room temperature requirement maintains the state before oil return, in this aspect, compensation adjustment may not be required; and after entering the oil return mode, the air outlet temperature requirement is increased in the process of increasing or decreasing the oil return frequency of the compressor, so that the target temperature regulation force of the heating element corresponding to the air outlet temperature requirement can be determined according to the mapping relation between the preset air outlet temperature requirement and the temperature regulation force of the heating element, the opening of the heating element is regulated by the target temperature regulation force to perform temperature compensation, the regulating force of the heating element is increased to reach the target temperature regulation force, the difference value between the current air outlet temperature and the air outlet temperature at the moment before oil return is reduced, and the constant temperature in the oil return process is realized.
In yet another aspect, if the room temperature requirement indicates that the first adjustment force is not zero, that is, the calculated difference between the current temperature and the expected temperature of the room is not 0 (or the ratio is not 1), the corresponding adjustment force is not 0, which indicates that the room temperature has not reached the expected temperature, or the heat load of the room changes during the oil return process, at this time, the room temperature requirement changes, and the air outlet temperature requirement increases during the process of increasing the compressor to the oil return frequency. The room temperature requirement and the air outlet temperature requirement act together, and the constant temperature and humidity in the oil return process are realized by pulling. The mapping relation between the room temperature requirement, the air outlet temperature requirement and the temperature regulation force of the heating element can be set and regulated according to the requirement.
Likewise, the adjustment compensation operation of the method described above is performed for the room humidity requirement, and will not be described here again.
The mapping relation between the air outlet temperature requirement and the temperature adjustment force of the heating element can be set and adjusted according to the requirement. For the condition of a plurality of heating elements, different mapping relations between different air outlet temperature demands and temperature adjustment forces of the heating elements can be set for different heating elements, so that the adjustment forces of the heating elements can be determined.
Optionally, the step 103 further includes:
if the room humidity demand indicates that the second adjusting force is zero, determining a target humidity adjusting force of the humidifying element corresponding to the out-of-rheumatism demand according to a preset mapping relation between the out-of-rheumatism demand and the humidity adjusting force of the humidifying element;
if the room humidity requirement indicates that the first adjusting force is not zero, determining a target humidity adjusting force of the humidifying element under the room humidity requirement and the out-of-rheumatism requirement according to a preset mapping relation between the room humidity requirement, the out-of-rheumatism requirement and the humidity adjusting force of the humidifying element;
and controlling the humidifying element to work with the target humidity adjusting force.
The adjusting and compensating control of the humidifying element according to the humidity requirement can refer to the specific description of the adjusting and compensating control method of the heating element according to the temperature requirement, and will not be repeated here.
The mapping relation between the out-rheumatism demand and the humidity adjustment force of the humidifying element can be set and adjusted according to the demand. For the condition of a plurality of humidification elements, different mapping relations between different out-of-wind-damp requirements and humidity adjustment forces of the humidification elements can be set for different humidification elements to determine the adjustment forces of the humidification elements.
Alternatively, in another embodiment, after entering the oil return mode, before step 102, it may be determined whether the temperature compensation control of the first aspect is needed according to the current temperature situation of the room. Specifically, the current temperature of the room and the expected temperature can be compared to determine, wherein the current temperature is the real-time temperature of the current room regulated by the variable-frequency air conditioner, the expected temperature is the set temperature, namely the temperature to be regulated in the current room, if the current temperature is not equal to the expected temperature, the room temperature requirement can be further triggered and calculated and the corresponding compensation control operation can be executed, and if the current temperature is equal to the expected temperature, the room temperature requirement can be not executed, and the calculation of the room temperature requirement can be understood to be unnecessary, and the calculation of the air outlet temperature requirement and the corresponding temperature compensation control operation can be directly executed. Similarly, the current humidity and the expected humidity may be compared to determine whether to calculate the room humidity requirement, which will not be described in detail herein.
In one embodiment, the method further comprises:
and under the condition that the time length of the variable-frequency air conditioner in the oil return mode reaches the preset oil return time length, exiting the oil return mode, and controlling the variable-frequency air conditioner to operate in a state before entering the oil return mode.
The preset oil return time length can be adjusted and set according to needs, and the embodiment of the application does not limit the oil return time length. In the preset oil return time length in the oil return mode, the room temperature and humidity requirement and the air outlet temperature and humidity requirement of the variable frequency air conditioner can be periodically calculated, and the opening degrees of devices such as a heating element, a humidifying element and the like are controlled to compensate the temperature and the humidity in real time, so that ultra-high precision temperature and humidity control in the oil return process is realized.
The variable frequency air conditioner oil return control method can be used for various scenes with high requirements on temperature and humidity, such as variable frequency air conditioner control scenes of archival collection, fiber inspection spinning, key laboratories and the like.
It will be appreciated that, for achieving the purpose of the present invention, the temperature and humidity compensation operation in step 103 according to the room temperature and humidity requirement and the outlet temperature and humidity requirement control of the inverter air conditioner may be performed according to the required compensation object, and some steps may be omitted. For example, in one embodiment, compensation is performed for temperature only, and then the steps associated with obtaining room humidity demand and deriving the humidity demand may not be included.
Specifically, referring to fig. 2, fig. 2 is a schematic flow chart of another method for controlling oil return of a variable frequency air conditioner provided in the present application. As shown in fig. 2, the flow is a cyclic flow, which is different from the embodiment shown in fig. 1: the variable-frequency air conditioner can periodically collect room temperature and humidity in a normal working mode; after entering the oil return mode, the temperature and humidity of the room and the temperature and humidity of the air outlet can be collected; specific:
(1) If the oil return is judged not to be entered, the variable-frequency air conditioner can periodically collect the room temperature and humidity in a normal working mode;
(2) After entering the oil return mode, the temperature and humidity of the room and the temperature and humidity of the air outlet can be collected; if the oil return is performed, the temperature and humidity compensation control can be performed by adopting the temperature and humidity of the room and the temperature and humidity of the air outlet as described in the embodiment shown in fig. 1, the compressor is controlled to run at the preset oil return frequency in the oil return mode, and the adjustment forces of the heating element and the humidifying element are regulated and controlled by the calculated temperature and humidity requirement of the room and the temperature and humidity requirement of the air outlet so as to perform the heat and humidity compensation;
(3) If the oil return is judged to be exited, the execution of the step (1) is resumed;
(4) If the oil return is not judged to be exited, the step (2) can be repeatedly executed.
In the embodiment of the application, the requirement on the system hardware structure is not high, and the oil return control logic can be completed in a matched mode only by arranging the temperature and humidity sensor at the air outlet of the variable-frequency air conditioner. The oil return control logic provided by the embodiment of the application is strong in adaptability and wide in application range, and is not limited by load scenes such as high temperature, high humidity, low temperature and low humidity.
In one currently common oil return scheme, the variable frequency air conditioner can increase the matched auxiliary heat source to raise the ambient temperature according to the difference between the oil return frequency and the current frequency so as to offset the output capacity of increasing the frequency when the compressor runs in oil return. There are 3 problems:
(1) the change condition of the room load is unknown in the oil return process, the system keeps constant output (the oil return frequency of the compressor operates, the difference value of auxiliary heat sources is output), and when the change of the room load can damage the balance and stability of the temperature and the humidity, the temperature and humidity control exceeds the standard;
(2) the auxiliary heat source is controlled in a grading manner, the first stage … … and the second stage … … cannot be coupled with the output of the refrigerating capacity of the compressor in a linear manner, if the calculated difference delta f=f2-f 1 is between the first stage and the second stage of the auxiliary heat source, the temperature control is unbalanced when the first stage or the second stage is started, and ultra-high precision temperature and humidity control cannot be realized.
The variable frequency air conditioner oil return control method can be suitable for ultra-high precision type temperature and humidity control, in the oil return process of the variable frequency air conditioner, the variable frequency air conditioner can dynamically detect and adapt to room load change, devices such as a compressor and an auxiliary heat source can be subjected to stepless linear adjustment, and the variable frequency air conditioner system and the room load are in real time balanced coupling, so that ultra-high precision type temperature and humidity control is realized.
Based on the description of the embodiment of the variable frequency air conditioner oil return control method, the embodiment of the application also discloses a variable frequency air conditioner oil return control device. As shown in fig. 3, the variable frequency air conditioner oil return control device 300 includes:
the calculating module 310 is configured to obtain a room temperature and humidity requirement when the variable frequency air conditioner enters an oil return mode, and obtain an air outlet temperature and humidity requirement of the variable frequency air conditioner, where the room temperature and humidity requirement is used to represent a first adjustment force required by a deviation between a current temperature and humidity of a room corresponding to the variable frequency air conditioner and an expected temperature and humidity, and the air outlet temperature and humidity requirement is used to represent a second adjustment force required by a deviation between the current air outlet temperature and humidity of the variable frequency air conditioner and the air outlet temperature and humidity of the variable frequency air conditioner before oil return;
the control module 320 is configured to adjust a current frequency of the compressor to a preset oil return frequency;
the control module 330 is further configured to perform temperature and humidity compensation operation according to the room temperature and humidity requirement and the air-conditioning outlet temperature and humidity requirement control during the period when the variable frequency air conditioner is in the oil return mode.
Optionally, the room temperature and humidity requirements include a room temperature requirement and a room humidity requirement; the variable frequency air conditioner oil return control device 300 further comprises an acquisition module 340, configured to acquire a current temperature and a current humidity of a room corresponding to the variable frequency air conditioner, and acquire an expected temperature and an expected humidity of the room preset by the variable frequency air conditioner;
The calculating module 310 is specifically configured to calculate a first difference or a first ratio of the current temperature to the expected temperature, adjust the first difference or the first ratio by using a first scaling factor, and calculate to obtain the room temperature requirement; and calculating a second difference value or a second ratio of the current humidity to the expected humidity, adjusting the second difference value or the second ratio by adopting a second proportionality coefficient, and calculating to obtain the room humidity requirement.
Optionally, the air outlet temperature and humidity requirement includes an air outlet temperature requirement and an air outlet rheumatism requirement, and the obtaining module 340 is further configured to:
acquiring the air outlet temperature and the air outlet humidity of the air conditioner before oil return, and acquiring the current air outlet temperature and the current air outlet humidity of the air conditioner;
the calculating module 310 is specifically configured to calculate a third difference or a third ratio between the air-out temperature before the oil return and the current air-out temperature, adjust the third difference or the third ratio by using a third scaling factor, and calculate to obtain the air-out temperature requirement; and calculating a fourth difference value or a fourth ratio of the air-out humidity before oil return and the current air-out humidity, adjusting the fourth difference value or the fourth ratio by adopting a fourth proportional coefficient, and calculating to obtain the air-out humidity demand.
Optionally, the control module 330 is specifically configured to:
if the room temperature requirement indicates that the first adjusting force is zero, determining a target temperature adjusting force of the heating element corresponding to the air outlet temperature requirement according to a mapping relation between the preset air outlet temperature requirement and the temperature adjusting force of the heating element;
if the room temperature requirement indicates that the first adjusting force is not zero, determining a target temperature adjusting force of the heating element under the room temperature requirement and the air outlet temperature requirement according to a mapping relation of the preset room temperature requirement, the air outlet temperature requirement and the temperature adjusting force of the heating element;
controlling the heating element to work with the target temperature adjustment force.
Optionally, the control module 330 is specifically configured to:
if the room humidity requirement indicates that the second adjusting force is zero, determining a target humidity adjusting force of the humidifying element corresponding to the out-of-rheumatism requirement according to a preset mapping relation between the out-of-rheumatism requirement and the humidity adjusting force of the humidifying element;
if the room humidity requirement indicates that the first adjusting force is not zero, determining target humidity adjusting force of the humidifying element under the room humidity requirement and the out-of-rheumatism requirement according to a preset mapping relation between the room humidity requirement, the out-of-rheumatism requirement and the humidity adjusting force of the humidifying element;
And controlling the humidifying element to work with the target humidity adjusting force.
Optionally, the obtaining module 340 is further configured to obtain a continuous accumulated duration when an operation frequency of the compressor of the variable frequency air conditioner is less than a first preset frequency;
the calculating module 310 is further configured to determine whether the continuous accumulated duration is less than a preset duration threshold;
the control module 330 is further configured to control the variable frequency air conditioner to enter the oil return mode if the continuous accumulated duration is not less than the preset duration threshold.
Optionally, the control module 330 is further configured to, after performing the temperature and humidity compensation operation according to the room temperature and humidity requirement and the outlet air temperature and humidity requirement control of the variable frequency air conditioner, exit the oil return mode and control the state operation before the variable frequency air conditioner enters the oil return mode when the duration of the variable frequency air conditioner in the oil return mode reaches the preset oil return duration.
According to an embodiment of the present application, the above apparatus may perform the steps in the method embodiment shown in fig. 1 or fig. 2, which are not described herein.
Based on the description of the method embodiment and the apparatus embodiment, the embodiment of the application also provides an electronic device, which may be a variable frequency air conditioner. As shown in fig. 4, which is a schematic structural diagram of an electronic device provided in the present application, the electronic device 400 may include a processor 401, an input/output device 402, a memory 403, and a computer storage medium. Wherein the various component units within the electronic device may be connected by a bus 404 or other means.
A computer storage medium may be stored in the memory 403 of the electronic device 400, where the computer storage medium is used to store a computer program, where the computer program includes program instructions, and where the processor 401 is used to execute the program instructions stored in the computer storage medium. A processor (or CPU (Central Processing Unit, central processing unit)) is a computing core and a control core of an electronic device, which is adapted to implement one or more instructions, in particular to load and execute one or more instructions to implement a corresponding method flow or a corresponding function; in one embodiment, the processor 401 described above in the embodiments of the present application may be used to perform a series of processes, including various steps involved in the method as shown in fig. 1 or fig. 2, and so on.
The embodiment of the application also provides a computer storage medium (Memory), which is a Memory device in the electronic device and is used for storing programs and data. It is understood that the computer storage media herein may include both built-in storage media in the electronic device and extended storage media supported by the electronic device. The computer storage medium provides a storage space that stores an operating system of the electronic device. Also stored in the memory space are one or more instructions, which may be one or more computer programs (including program code), adapted to be loaded and executed by the processor. The computer storage medium herein may be a high-speed RAM memory or a non-volatile memory (non-volatile memory), such as at least one magnetic disk memory; optionally, at least one computer storage medium remote from the processor may be present.
In one embodiment, one or more instructions stored in a computer storage medium may be loaded and executed by a processor to implement the corresponding steps in the above embodiments; in specific implementations, one or more instructions in the computer storage medium may be loaded by the processor and perform the steps involved in the method as shown in fig. 1 or fig. 2, which are not described herein.
It will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the apparatus and modules described above may refer to the corresponding process in the foregoing method embodiment, which is not repeated herein.
In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the division of the module is merely a logical function division, and there may be another division manner when actually implemented, for example, a plurality of modules or components may be combined or may be integrated into another system, or some features may be omitted or not performed. The coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, device or module indirect coupling or communication connection, which may be in electrical, mechanical, or other form.
The modules illustrated as separate components may or may not be physically separate, and components shown as modules may or may not be physical modules, i.e., may be located in one place, or may be distributed over a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted across a computer-readable storage medium. The computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a read-only memory (ROM), or a random-access memory (random access memory, RAM), or a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape, a magnetic disk, or an optical medium, such as a digital versatile disk (digital versatile disc, DVD), or a semiconductor medium, such as a Solid State Disk (SSD), or the like.
Claims (9)
1. The method for controlling the oil return of the variable-frequency air conditioner is characterized by comprising the following steps of:
under the condition that the variable-frequency air conditioner enters an oil return mode, the current frequency of the compressor is adjusted to a preset oil return frequency to work;
acquiring a room temperature and humidity requirement, namely acquiring an air outlet temperature and humidity requirement of the variable frequency air conditioner, wherein the room temperature and humidity requirement is used for representing a first regulation force required by deviation of the current temperature and humidity of a room corresponding to the variable frequency air conditioner and the expected temperature and humidity, and the air outlet temperature and humidity requirement is used for representing a second regulation force required by deviation of the current air outlet temperature and humidity of the variable frequency air conditioner and the air outlet temperature and humidity of the variable frequency air conditioner before oil return;
during the period that the variable-frequency air conditioner is in the oil return mode, performing temperature and humidity compensation operation according to the room temperature and humidity requirement and the air outlet temperature and humidity requirement control of the variable-frequency air conditioner;
the room temperature and humidity requirement comprises a room temperature requirement and a room humidity requirement, and then the temperature and humidity compensation operation is carried out according to the room temperature and humidity requirement and the air outlet temperature and humidity requirement control of the variable-frequency air conditioner, and the method comprises the following steps:
if the room temperature requirement indicates that the first adjusting force is zero, determining a target temperature adjusting force of the heating element corresponding to the air outlet temperature requirement according to a mapping relation between the preset air outlet temperature requirement and the temperature adjusting force of the heating element;
If the room temperature requirement indicates that the first adjusting force is not zero, determining a target temperature adjusting force of the heating element under the room temperature requirement and the air outlet temperature requirement according to a mapping relation of the preset room temperature requirement, the air outlet temperature requirement and the temperature adjusting force of the heating element;
controlling the heating element to work with the target temperature adjustment force.
2. The method for controlling oil return of a variable frequency air conditioner according to claim 1, wherein the step of obtaining the room temperature and humidity requirement comprises the steps of:
acquiring the current temperature and the current humidity of a room corresponding to the variable-frequency air conditioner, and acquiring the expected temperature and the expected humidity of the room preset by the variable-frequency air conditioner;
calculating a first difference or a first ratio of the current temperature to the expected temperature, adjusting the first difference or the first ratio by adopting a first ratio coefficient, and calculating to obtain the room temperature requirement; and calculating a second difference value or a second ratio of the current humidity to the expected humidity, adjusting the second difference value or the second ratio by adopting a second proportionality coefficient, and calculating to obtain the room humidity requirement.
3. The method for controlling oil return of a variable frequency air conditioner according to claim 2, wherein the air outlet temperature and humidity requirements include an air outlet temperature requirement and an air outlet humidity requirement, and the obtaining the air outlet temperature and humidity requirement of the variable frequency air conditioner includes:
acquiring the air outlet temperature and the air outlet humidity of the air conditioner before oil return, and acquiring the current air outlet temperature and the current air outlet humidity of the air conditioner;
calculating a third difference value or a third ratio of the air outlet temperature before oil return and the current air outlet temperature, adjusting the third difference value or the third ratio by adopting a third proportionality coefficient, and calculating to obtain the air outlet temperature requirement; and calculating a fourth difference value or a fourth ratio of the air-out humidity before oil return and the current air-out humidity, adjusting the fourth difference value or the fourth ratio by adopting a fourth proportional coefficient, and calculating to obtain the air-out humidity demand.
4. The method for controlling oil return of a variable frequency air conditioner according to claim 1, wherein the temperature and humidity compensation operation is performed according to the room temperature and humidity requirement and the outlet air temperature and humidity requirement control of the variable frequency air conditioner, further comprising:
if the room humidity requirement indicates that the first adjusting force is zero, determining a target humidity adjusting force of the humidifying element corresponding to the out-of-rheumatism requirement according to a preset mapping relation between the out-of-rheumatism requirement and the humidity adjusting force of the humidifying element;
If the room humidity requirement indicates that the first adjusting force is not zero, determining target humidity adjusting force of the humidifying element under the room humidity requirement and the out-of-rheumatism requirement according to a preset mapping relation between the room humidity requirement, the out-of-rheumatism requirement and the humidity adjusting force of the humidifying element;
and controlling the humidifying element to work with the target humidity adjusting force.
5. The variable frequency air conditioner oil return control method according to claim 1, characterized in that the method further comprises:
acquiring continuous accumulated time length when the running frequency of the compressor of the variable-frequency air conditioner is smaller than a first preset frequency;
judging whether the continuous accumulated time length is smaller than a preset time length threshold value or not;
and if the temperature is not less than the preset temperature, controlling the variable-frequency air conditioner to enter the oil return mode.
6. The variable frequency air conditioner oil return control method according to any one of claims 1 to 5, wherein after the temperature and humidity compensation operation is performed according to the room temperature and humidity requirement and the outlet air temperature and humidity requirement control of the variable frequency air conditioner, the method further comprises:
and under the condition that the time length of the variable-frequency air conditioner in the oil return mode reaches the preset oil return time length, exiting the oil return mode, and controlling the variable-frequency air conditioner to operate in a state before entering the oil return mode.
7. The utility model provides a variable frequency air conditioner oil return controlling means which characterized in that includes:
the calculation module is used for acquiring room temperature and humidity requirements under the condition that the variable frequency air conditioner enters an oil return mode, acquiring air outlet temperature and humidity requirements of the variable frequency air conditioner, wherein the room temperature and humidity requirements are used for representing first adjustment force required by deviation of current temperature and humidity and expected temperature and humidity of a room corresponding to the variable frequency air conditioner, and the air outlet temperature and humidity requirements are used for representing second adjustment force required by deviation of current air outlet temperature and humidity of the variable frequency air conditioner and air outlet temperature and humidity of the variable frequency air conditioner before oil return;
the control module is used for adjusting the current frequency of the compressor to a preset oil return frequency;
the control module is also used for performing temperature and humidity compensation operation according to the room temperature and humidity requirement and the air outlet temperature and humidity requirement control of the variable-frequency air conditioner during the period that the variable-frequency air conditioner is in the oil return mode;
the room temperature and humidity requirement comprises a room temperature requirement and a room humidity requirement, and then the temperature and humidity compensation operation is carried out according to the room temperature and humidity requirement and the air outlet temperature and humidity requirement control of the variable-frequency air conditioner, and the method comprises the following steps: if the room temperature requirement indicates that the first adjusting force is zero, determining a target temperature adjusting force of the heating element corresponding to the air outlet temperature requirement according to a mapping relation between the preset air outlet temperature requirement and the temperature adjusting force of the heating element; if the room temperature requirement indicates that the first adjusting force is not zero, determining a target temperature adjusting force of the heating element under the room temperature requirement and the air outlet temperature requirement according to a mapping relation of the preset room temperature requirement, the air outlet temperature requirement and the temperature adjusting force of the heating element; controlling the heating element to work with the target temperature adjustment force.
8. An electronic device comprising a memory and a processor, the memory storing a computer program that, when executed by the processor, causes the processor to perform the steps of the variable frequency air conditioner oil return control method according to any one of claims 1 to 6.
9. A computer-readable storage medium, characterized in that a computer program is stored, which when executed by a processor causes the processor to perform the steps of the variable frequency air conditioner oil return control method according to any one of claims 1 to 6.
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| CN104764167B (en) * | 2015-04-21 | 2018-05-01 | 珠海格力电器股份有限公司 | Oil return control method of variable frequency air conditioner compressor |
| JP6827540B2 (en) * | 2017-06-27 | 2021-02-10 | 三菱電機株式会社 | Air conditioner |
| CN107560094B (en) * | 2017-10-09 | 2023-06-02 | 珠海格力电器股份有限公司 | Control method and device of air conditioning system and air conditioning system |
| CN108489150B (en) * | 2018-02-02 | 2020-06-16 | 青岛海尔空调电子有限公司 | A method and system for multi-line oil return control |
| CN108679780B (en) * | 2018-04-11 | 2019-08-09 | 浙江国祥股份有限公司 | A kind of high-precision constant-temperature constant-moisture air-conditioning system and control method |
| CN108954706B (en) * | 2018-06-19 | 2021-04-09 | 广东美的制冷设备有限公司 | Control method of air conditioner, air conditioner and storage medium |
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