CN113531841A - Oil return control method and device for variable frequency air conditioner, electronic equipment and medium - Google Patents
Oil return control method and device for variable frequency air conditioner, electronic equipment and medium Download PDFInfo
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- CN113531841A CN113531841A CN202110721968.3A CN202110721968A CN113531841A CN 113531841 A CN113531841 A CN 113531841A CN 202110721968 A CN202110721968 A CN 202110721968A CN 113531841 A CN113531841 A CN 113531841A
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The application discloses a method and a device for controlling oil return of a variable frequency air conditioner, 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, adjusting the current frequency of the compressor to a preset oil return frequency to work; acquiring room temperature and humidity requirements and acquiring air outlet temperature and humidity requirements of the variable frequency air conditioner, wherein the room temperature and humidity requirements are used for expressing first adjusting 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 expressing second adjusting 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; and when the variable frequency air conditioner is in the oil return mode, controlling to perform temperature and humidity compensation operation according to the room temperature and humidity requirements and the air outlet temperature and humidity requirements 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 method and a device for controlling oil return of a variable frequency air conditioner, electronic equipment and a medium.
Background
Air conditioning systems used in some occasions have very high requirements on the precision, stability and the like of temperature and humidity. For example, the variable frequency air conditioner of an ultra-high precision laboratory strictly requires the allowable fluctuation range of temperature and relative humidity.
At present, an air conditioner in a 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 at a low frequency section for a long time, the risks of unsmooth oil return and poor lubrication can be caused, and further, the abrasion failure of a moving part of the compressor can be caused. Therefore, most inverter compressors are provided with oil return control logic to alleviate and avoid the above problems. For example, after 3 hours of continuous compressor operation, the compressor is run for 5 minutes per second at 60 revolutions, and then returned to regulation as required.
However, the precision and stability of temperature and humidity control are seriously affected by the oil return process of the compressor, the refrigeration capacity and the dehumidification capacity of the system are sharply enhanced when the compressor enters oil return, and the processed air is sent into a room through an air duct, mixed and circulated and then returned to the variable frequency air conditioning unit, so that the feedback is delayed, and the load balance and the temperature and humidity stability of the current room are damaged.
Disclosure of Invention
The application provides an oil return control method and device for a variable frequency air conditioner, electronic equipment and a medium, and can solve the problem of temperature and humidity fluctuation caused by oil return operation of a compressor in the variable frequency air conditioner.
In a first aspect, a method for controlling oil return of a variable frequency air conditioner is provided, which includes:
under the condition that the variable frequency air conditioner enters an oil return mode, adjusting the current frequency of the compressor to a preset oil return frequency to work;
acquiring room temperature and humidity requirements and acquiring air outlet temperature and humidity requirements of the variable frequency air conditioner, wherein the room temperature and humidity requirements are used for expressing first adjusting 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 expressing second adjusting 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;
and when the variable frequency air conditioner is in the oil return mode, controlling to perform temperature and humidity compensation operation according to the room temperature and humidity requirements and the air outlet temperature and humidity requirements of the variable frequency air conditioner.
In a second aspect, a variable frequency air conditioner oil return control device is provided, which includes:
the air conditioner comprises a calculation module, a control module and a control module, wherein the calculation module is used for acquiring room temperature and humidity requirements and acquiring air outlet temperature and humidity requirements of the variable frequency air conditioner under the condition that the variable frequency air conditioner enters an oil return mode, the room temperature and humidity requirements are used for expressing first adjusting force required by deviation of current temperature and humidity of a room corresponding to the variable frequency air conditioner and expected temperature and humidity, and the air outlet temperature and humidity requirements are used for expressing second adjusting 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 temperature and humidity compensation operation according to the room temperature and humidity requirements and the air outlet temperature and humidity requirements of the inverter air conditioner when the inverter air conditioner is in the oil return mode.
In a third aspect, an electronic device is provided, 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 possible implementation thereof.
According to the method, under the condition that an inverter air conditioner enters an oil return mode, room temperature and humidity requirements are obtained, and air outlet temperature and humidity requirements of the inverter air conditioner are obtained, wherein the room temperature and humidity requirements are used for expressing first adjusting force required by deviation of current temperature and humidity and expected temperature and humidity of a room corresponding to the inverter air conditioner, and the air outlet temperature and humidity requirements are used for expressing second adjusting force required by deviation conditions of current air outlet temperature and humidity of the inverter air conditioner and air outlet temperature and humidity of the inverter air conditioner before oil return; adjusting the current frequency of the compressor to a preset oil return frequency; when the variable frequency air conditioner is in the oil return mode, temperature and humidity compensation operation is carried out according to room temperature and humidity requirements and air outlet temperature and humidity requirements of the variable frequency air conditioner, an auxiliary heat source can be adaptively added according to the room temperature and humidity requirements and the air outlet temperature and humidity requirements to adjust the ambient temperature so as to offset temperature and humidity fluctuation caused 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 achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings required to be used in the embodiments or the background art of the present application will be described below.
Fig. 1 is a schematic flow chart of an oil return control method of an inverter 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 an inverter air conditioner according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an oil return control device of an inverter 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 technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively 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 can be included in at least one embodiment of the application. The appearances of the phrase 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. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The embodiments of the present application will be described below with reference to the drawings.
Referring to fig. 1, fig. 1 is a schematic flow chart of an oil return control method of an inverter air conditioner according to an embodiment of the present application. The method can comprise the following steps:
101. and under the condition that the variable frequency air conditioner enters an oil return mode, adjusting the current frequency of the compressor to a preset oil return frequency to work.
The oil return control method of the variable frequency air conditioner in the embodiment of the application can be applied to an oil return control device of the variable frequency air conditioner, and the oil return control device of the variable frequency air conditioner can be electronic equipment such as the variable frequency air conditioner, for example, the variable frequency air conditioner applied to a laboratory scene or a high-precision air conditioner. The inverter air conditioner comprises an inverter compressor, and can further comprise constituent elements such as a condenser, a liquid storage device, an expansion valve and an evaporator, and also comprises a main control system of the system, and the main control system is used for regulating and controlling each element.
During the operation process of an inverter air conditioner (air conditioner), a part of lubricating oil in a compressor circularly flows in the inverter air conditioner system along with a refrigerant. When the compressor runs at a low frequency, the circulation flow in the system is small, the flow rate of the refrigerant is reduced, and lubricating oil in the refrigerant is deposited in parts such as a heat exchanger, a gas-liquid separator and a pipeline under the influence of gravity, so that the compressor works in an oil-deficient state, and the consequences such as abrasion of the compressor, burnout of a motor and the like can be caused. Therefore, it is necessary to forcibly increase 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 precision and stability of temperature and humidity control are affected by the oil return process of the compressor, the refrigeration capacity and the dehumidification capacity of the system are enhanced rapidly during oil return, and the processed air is sent into a room through an air duct, mixed and circulated and then returned to the variable frequency air conditioning unit, so that feedback is delayed, and load balance and temperature and humidity stability are damaged. In the embodiment of the application, when the inverter air conditioner enters the oil return mode, a specific compensation control logic may be executed, as shown in step 102 and step 103, to compensate for the temperature and the humidity, so that the above problem may be solved.
In one embodiment, before the step 101, the method may further include:
acquiring continuous accumulated time when the running frequency of a compressor of the inverter air conditioner is less 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 not, controlling the variable frequency air conditioner to enter the oil return mode.
Specifically, the operating frequency of the compressor may be monitored, and the continuous accumulated duration when the operating frequency of the compressor is less than the first preset frequency may be recorded. It can be understood that, when the operating frequency of the compressor is less than a certain preset frequency and the continuous operating time in the state reaches a preset time threshold, it is determined that the variable frequency air conditioner needs oil return, and the variable frequency air conditioner enters the oil return mode, that is, the current frequency of the compressor can be adjusted to the preset oil return frequency to operate. The first preset frequency, the preset time threshold and the preset oil return frequency can be set as required, and the embodiment of the application does not limit the setting.
102. Acquiring room temperature and humidity requirements and acquiring air outlet temperature and humidity requirements of the variable frequency air conditioner, wherein the room temperature and humidity requirements are used for expressing first adjusting 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 expressing second adjusting 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 between the current temperature and humidity 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 embodiment of the present application, in the oil return mode, step 102 and step 103 may be periodically executed. 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 elements for heating and humidifying compensation.
In the embodiment of the application, the greenhouse temperature deviation in two aspects can be considered, including the room temperature and humidity requirements and the air outlet temperature and humidity requirements, and the current temperature and humidity of the room and the deviation of the expected temperature and humidity, the current air outlet temperature and humidity of the variable frequency air conditioner and the deviation of the air outlet temperature and humidity of the variable frequency air conditioner before oil return are respectively measured. The room humiture demand is used for guaranteeing that the humiture gradually reaches the expected value, ensures the degree of accuracy, but receives influence such as sampling point position, engineering wind channel, and there is certain lag in this demand, and big shock appears in the oil return process can be avoided to the air-out humiture demand, perhaps frequency conversion air conditioner output capacity and room load mismatch seriously, and this demand can the quick response change, and adjustment correlator spare is exported, ensures stability.
And when the air conditioner enters the oil return mode, the variable frequency air conditioner is controlled according to room temperature and humidity requirements and air outlet temperature and humidity requirements. The demand calculation and control in the embodiment of the application can adopt a closed-loop control algorithm, the closed-loop control is a control mode of correcting according to the output feedback of a control object, and the correction is carried out according to a quota or standard when the deviation between the actual value and the planned value is measured. For example, to control the speed of a motor, a sensor is provided to measure the speed and feed the result back to the control circuit. In an alternative embodiment, PID control algorithms can be used, PID being the abbreviations of proportional (contribution), Integral (Integral), and Differential (Differential coefficient), representing three control algorithms respectively. The deviation of the controlled object can be effectively corrected by the combination of the three algorithms, so that the controlled object reaches a stable state.
Performing PID (proportion integration differentiation) calculation on the room temperature and humidity requirements according to the collected current temperature and humidity and the expected temperature and humidity of the room, and representing the deviation condition of the current temperature and humidity and the expected temperature and humidity, wherein the smaller the room temperature and humidity requirements are, the better the temperature and humidity control condition is; and performing PID calculation on the air outlet temperature and humidity requirements by the collected current air outlet temperature and humidity of the variable frequency air conditioner and the air outlet temperature and humidity before oil return so as to control the stability of the output capacity of the variable frequency air conditioner during oil return operation.
In an embodiment, the acquiring of the room temperature and humidity requirement includes:
the method comprises the steps of obtaining the current temperature and the current humidity of a room corresponding to the variable frequency air conditioner, obtaining the expected temperature and the expected humidity of the room preset by the variable frequency air conditioner, calculating according to the current temperature and the expected temperature of the room corresponding to the variable frequency air conditioner to obtain a room temperature requirement, and calculating according to the current humidity and the expected humidity of the room corresponding to the variable frequency air conditioner to obtain the room humidity requirement. The specific calculation method may include:
calculating a first difference or a first ratio between the current temperature and 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 and 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 used 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, the engineering installation standard and the like, and the method is not limited in the embodiment of the application.
Specifically, the room temperature requirement can be calculated by calculating the difference or ratio between the current temperature and the expected temperature, wherein the larger the difference is, the larger the requirement is, the larger the adjustment force is required, and the larger the difference between the ratio and "1" is, the larger the requirement is, the larger the adjustment force is required. Optionally, a scaling factor may be set as required, and the obtained difference or ratio may be adjusted. The smaller the proportionality coefficient is, the smaller the control action is, and the slower the system response is; conversely, the larger the scaling factor, the stronger the control action, and the faster the system response. However, the scale factor is too large, which causes the system to generate large overshoot and oscillation, resulting in poor stability of the system. Therefore, the scale factor cannot be selected too much, and the scale factor can be selected in a compromise mode according to the characteristics of the controlled object, so that the static error of the system is controlled within an allowable range, and the system has a higher response speed.
In an embodiment, above-mentioned air-out humiture demand includes air-out temperature demand and air-out humidity demand, and the above-mentioned air-out humiture demand that acquires above-mentioned frequency conversion air conditioner includes:
the air outlet temperature and the air outlet humidity of the variable frequency air conditioner before oil return are obtained, the current air outlet temperature and the current air outlet humidity of the variable frequency air conditioner are obtained, the air outlet temperature demand is obtained through calculation according to the air outlet temperature of the variable frequency air conditioner before oil return and the current air outlet temperature, and the air outlet humidity demand is obtained through calculation according to the air outlet humidity of the variable frequency air conditioner before oil return and the current air outlet humidity. The specific calculation method may include:
calculating a third difference or a third ratio between the air-out temperature before oil return and the current air-out temperature, adjusting the third difference or the third ratio by adopting a third proportionality coefficient, and calculating to obtain the air-out temperature requirement; and calculating a fourth difference or a fourth ratio of the air-out humidity before oil return and the current air-out humidity, adjusting the fourth difference or the fourth ratio by adopting a fourth proportionality coefficient, and calculating to obtain the air-out humidity requirement.
In this application embodiment, can gather air-out temperature and air-out humidity through the sensor of air-out position, for example can arrange air-out humiture probe at variable frequency air conditioner air outlet.
Similarly, for the specific calculation mode of the air outlet temperature and humidity requirement, reference may be made to the foregoing description of the calculation mode of the room temperature and humidity requirement, and details are not described here again.
Alternatively, the same or different scaling factors may be set for different types of parameter control, e.g. different scaling factors may be used for the calculation of the temperature and humidity requirements.
The adjustment strength of compensation can be further determined through the calculated demand, and the compensation control operation of temperature and/or humidity is correspondingly executed.
103. And when the variable-frequency air conditioner is in the oil return mode, controlling to perform 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.
The refrigerating capacity and the dehumidifying capacity of the system are enhanced sharply in the oil return process, and the auxiliary compensation can be realized through the heating element and the humidifying element, 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 PTC, an electrical heating tube, and other mechanical devices that convert electrical energy into thermal energy, and the humidifying element may include electrode humidifying, infrared humidifying, wet film humidifying, ultrasonic humidifying, and other humidifying devices, which are not limited in this application.
Conventionally, the inverter air conditioner can calculate the demand according to the room humiture of gathering and setting for humiture to carry out temperature and humidity compensation, specifically can be the aperture of controlling above-mentioned devices such as heating element, humidification element carries out temperature and humidity compensation. Namely, when the air conditioner enters an oil return mode, the compressor is increased to or decreased to oil return frequency at a certain speed, the air conditioner runs constantly and continuously, and the heating element and the humidifying element are synchronously started and compensated according to room temperature and humidity requirements and air outlet temperature and humidity requirements during the period.
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 a 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 preset mapping relation between the room temperature requirement, the air outlet temperature requirement and the temperature adjusting force of the heating element;
and controlling the heating element to work at the target temperature adjusting force.
Specifically, the method for controlling the adjustment compensation of the heating element according to the temperature requirement in the embodiment of the present application includes two aspects.
On one hand, if the room temperature requirement indicates that the first adjustment strength is zero, that is, the difference between the calculated current room temperature and the expected room temperature is 0 (or the ratio is 1), the corresponding adjustment strength is 0, which indicates that the current room temperature has reached the expected room temperature, and is in a steady state equilibrium state, and after entering the oil return mode, the room temperature requirement is maintained in a state before oil return, in this respect, compensation adjustment may not be required; and after entering the oil return mode simultaneously, the compressor rises to or falls to the oil return frequency in-process, the air-out temperature demand increases, consequently can be according to the mapping relation of the air-out temperature demand of predetermineeing and heating element's temperature regulation dynamics, confirm the target temperature regulation dynamics of the heating element that above-mentioned air-out temperature demand corresponds, adjust the aperture of heating element with this target temperature regulation dynamics in order to carry out temperature compensation, heating element regulation dynamics increases progressively and reaches target temperature regulation dynamics, in order to reduce the difference of the air-out temperature at present air-out temperature and the air-out temperature before the oil return moment, realize the constant temperature in the oil return process.
On the other hand, if the room temperature requirement indicates that the first adjustment strength is not zero, that is, the difference between the calculated current room temperature and the expected room temperature is not 0 (or the ratio is not 1), the corresponding adjustment strength is not 0, which indicates that the room temperature has not reached the expected temperature, or the room heat load changes during the oil return process, at this time, the room temperature requirement changes, and the outlet air temperature requirement increases during the process that the compressor is raised to the oil return frequency. The room temperature requirement and the air outlet temperature requirement act together to realize constant temperature and humidity in the oil return process by pulling. The mapping relation between the room temperature requirement, the air outlet temperature requirement and the temperature adjusting force of the heating element can be set and adjusted according to needs.
Likewise, the adjustment compensation operation as described above is performed for the room humidity requirement, and will not be described herein.
Wherein, the mapping relation of above-mentioned air-out temperature demand and heating element's temperature regulation dynamics can set up and adjust as required. For the condition of a plurality of heating elements, the mapping relation between different air outlet temperature requirements and the temperature regulation force of the heating elements can be set for different heating elements, so that the regulation force of each heating element is determined.
Optionally, the step 103 further includes:
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 outlet air humidity requirement according to a mapping relation between a preset outlet air humidity 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 a target humidity adjusting force of the humidifying element under the room humidity requirement and the outlet humidity requirement according to a preset mapping relation between the room humidity requirement, the outlet humidity requirement and the humidity adjusting force of the humidifying element;
and controlling the humidifying element to work at the target humidity adjusting force.
For the adjustment compensation control of the humidification element according to the humidity requirement, reference may be made to the foregoing detailed description of the adjustment compensation control method of the heating element according to the temperature requirement, and details are not described here again.
Wherein, the mapping relation of above-mentioned air-out humidity demand and humidification element's humidity control dynamics can set up and adjust as required. To the condition of a plurality of humidification elements, can set up the mapping relation of different air-out humidity demands and its humidity control dynamics to different humidification elements, confirm the regulation dynamics of each humidification element.
Optionally, 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 required according to the current temperature condition of the room. Specifically, the current temperature of the room may be compared with an expected temperature for judgment, where the current temperature is a real-time temperature of the current room adjusted by the inverter air conditioner, and the expected temperature is a set temperature, that is, a temperature to which the current room needs to be adjusted, and if the current temperature is not equal to the expected temperature, the room temperature calculation may be further triggered and a corresponding compensation control operation may be executed. Similarly, the current humidity may be compared with the expected humidity to determine whether to calculate the room humidity requirement, which is not described 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 can be adjusted and set according to needs, and the embodiment of the application does not limit the preset oil return time. Within the preset oil return time length in the oil return mode, room temperature and humidity requirements and air outlet temperature and humidity requirements of the variable frequency air conditioner can be periodically calculated, and the opening degrees of devices such as a heating element and a humidifying element are controlled to compensate the temperature and the humidity in real time, so that ultrahigh precision temperature and humidity control in the oil return process is realized.
The oil return control method of the variable frequency air conditioner in the embodiment of the application can be used in various scenes with higher requirements on temperature and humidity, such as variable frequency air conditioner control scenes of archives, fiber detection textiles, key laboratories and the like.
It can be understood that, in order to achieve the purpose of the present invention, within the spirit of the present invention, the temperature and humidity compensation operation performed according to the room temperature and humidity requirement and the output air temperature and humidity requirement of the inverter air conditioner in step 103 may be performed according to the required compensation object, and some steps may be omitted. For example, in an embodiment, compensation is performed only for temperature, and the steps associated with acquiring room humidity and outlet humidity requirements may not be included.
Specifically, referring to fig. 2, fig. 2 is a schematic flow chart of another variable frequency air conditioner oil return control method provided by the present application. As shown in fig. 2, the process is a cyclic process, which is different from the embodiment shown in fig. 1: the variable frequency air conditioner can periodically collect the temperature and the humidity of a room in a normal working mode; after entering the oil return mode, the temperature and humidity of a room and the temperature and humidity of air outlet can be collected; specifically, the method comprises the following steps:
(1) if the oil return is judged not to enter, the variable frequency air conditioner can periodically collect the temperature and the humidity of a room in a normal working mode;
(2) after entering the oil return mode, the temperature and humidity of a room and the temperature and humidity of air outlet can be collected; if oil return is carried out, room temperature and humidity and air outlet temperature and humidity described in the embodiment shown in fig. 1 can be adopted for temperature and humidity compensation control, the compressor is controlled to operate at a preset oil return frequency in an oil return mode, and the adjusting force of the heating element and the humidifying element is regulated and controlled according to the calculated room temperature and humidity requirements and the air outlet temperature and humidity requirements so as to carry out heat and humidity compensation;
(3) if the oil return is judged to be quitted, the step (1) is resumed;
(4) if the oil return is judged not to be quitted, 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 matching manner only by arranging the temperature and humidity sensor at the air outlet of the variable frequency air conditioner. The oil return control logic of the embodiment of the application has strong adaptability and wide application range, and is not limited by load scenes such as high temperature, high humidity, low temperature and low humidity.
In a currently common oil return scheme, the variable frequency air conditioner may increase the ambient temperature by adding a matched auxiliary heat source according to a difference between the oil return frequency and the current frequency, so as to offset the output capability of the compressor increasing the frequency during oil return operation. There are 3 problems:
firstly, the change condition of room load is unknown in the oil return process, the system keeps constant output (the oil return frequency of a compressor is operated, and the difference value of an auxiliary heat source is output), and when the room load changes, the temperature and humidity balance stability is damaged, and the temperature and humidity control exceeds the standard;
secondly, the auxiliary heat source is controlled in a grading mode, the first-stage … … and the second-stage … … cannot be linearly coupled with the output of the refrigerating capacity of the compressor, if the calculated difference delta f is f2-f1 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 ultrahigh precision temperature and humidity control cannot be achieved.
The oil return control method of the variable frequency air conditioner can be suitable for ultrahigh precision temperature and humidity control, dynamic detection adapts to room load change in the oil return process of the variable frequency air conditioner, devices such as a compressor and an auxiliary heat source can be adjusted in a stepless linear mode, a variable frequency air conditioner system and the room load are in balanced coupling in real time, and ultrahigh precision temperature and humidity control is achieved.
Based on the description of the variable frequency air conditioner oil return control method embodiment, the embodiment of the application also discloses a variable frequency air conditioner oil return control device. As shown in fig. 3, the oil return control device 300 of the inverter air conditioner includes:
the calculation module 310 is configured to obtain room temperature and humidity requirements and obtain air outlet temperature and humidity requirements of the inverter air conditioner when the inverter air conditioner enters an oil return mode, where the room temperature and humidity requirements are used to indicate a first adjustment force required for a deviation between a current temperature and a desired temperature and humidity of a room corresponding to the inverter air conditioner, and the air outlet temperature and humidity requirements are used to indicate a second adjustment force required for a deviation between a current air outlet temperature and humidity of the inverter air conditioner and an air outlet temperature and humidity of the inverter air conditioner before oil return;
the control module 320 is used for adjusting the current frequency of the compressor to a preset oil return frequency;
the control module 330 is further configured to control temperature and humidity compensation operation according to the room temperature and humidity requirement and the air outlet temperature and humidity requirement of the air conditioner when the inverter 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 oil return control device 300 of the variable frequency air conditioner further comprises an obtaining module 340, configured to obtain a current temperature and a current humidity of a room corresponding to the variable frequency air conditioner, and obtain 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 between the current temperature and the expected temperature, adjust the first difference or the first ratio by using a first ratio coefficient, and calculate to obtain the room temperature requirement; and calculating a second difference or a second ratio of the current humidity and 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.
Optionally, the air-out humiture demand includes air-out temperature demand and air-out humidity demand, the acquisition 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 oil return and the current air-out temperature, adjust the third difference or the third ratio by using a third proportionality coefficient, and calculate to obtain the air-out temperature requirement; and calculating a fourth difference or a fourth ratio of the air-out humidity before oil return and the current air-out humidity, adjusting the fourth difference or the fourth ratio by adopting a fourth proportionality coefficient, and calculating to obtain the air-out humidity requirement.
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 a 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 preset mapping relation between the room temperature requirement, the air outlet temperature requirement and the temperature adjusting force of the heating element;
and controlling the heating element to work at the target temperature regulation 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 outlet air humidity requirement according to a mapping relation between a preset outlet air humidity 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 a target humidity adjusting force of the humidifying element under the room humidity requirement and the outlet humidity requirement according to a preset mapping relation between the room humidity requirement, the outlet humidity requirement and the humidity adjusting force of the humidifying element;
and controlling the humidifying element to work at the target humidity adjusting force.
Optionally, the obtaining module 340 is further configured to obtain a continuous accumulated time length when the operating frequency of the compressor of the inverter air conditioner is less than a first preset frequency;
the calculating module 310 is further configured to determine whether the continuous accumulated time length is smaller than a preset time length threshold;
the control module 330 is further configured to control the inverter air conditioner to enter the oil return mode if the continuous accumulated time is not less than the preset time threshold.
Optionally, the control module 330 is further configured to, after 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 inverter air conditioner, exit from the oil return mode and control the inverter air conditioner to operate in a state before entering the oil return mode when a duration that the inverter air conditioner is in the oil return mode reaches a preset oil return duration.
According to an embodiment of the present application, the apparatus may perform the steps in the method embodiments shown in fig. 1 or fig. 2, which are not described herein again.
Based on the description of the method embodiment and the device embodiment, the embodiment of the application further provides an electronic device, and the electronic device can 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 otherwise.
A computer storage medium may be stored in the memory 403 of the electronic device 400, the computer storage medium being configured to store a computer program comprising program instructions, the processor 401 being configured to execute the program instructions stored by the computer storage medium. A processor (or CPU) is a computing core and a control core of an electronic device, and is adapted to implement one or more instructions, and in particular, is adapted to load and execute the one or more instructions so as to implement a corresponding method flow or a corresponding function; in one embodiment, the processor 401 described above in this embodiment of the present application may be configured to perform a series of processes, including various steps involved in the method shown in fig. 1 or fig. 2.
An embodiment of the present application further provides a computer storage medium (Memory), which is a Memory device in an electronic device and is used to store programs and data. It is understood that the computer storage medium herein may include both a built-in storage medium in the electronic device and, of course, an extended storage medium supported by the electronic device. Computer storage media provide storage space that stores an operating system for an electronic device. Also stored in the memory space are one or more instructions, which may be one or more computer programs (including program code), suitable for loading and execution by the processor. The computer storage medium may be a high-speed RAM memory, or may be a non-volatile memory (non-volatile memory), such as at least one disk memory; and optionally at least one computer storage medium located remotely from the processor.
In one embodiment, one or more instructions stored in a computer storage medium may be loaded and executed by a processor to perform the corresponding steps in the above embodiments; in a specific implementation, one or more instructions in the computer storage medium may be loaded by the processor and perform the steps involved in the method shown in fig. 1 or fig. 2, which are not described herein again.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses and modules may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the division of the module is only one logical division, and other divisions may be possible in actual implementation, for example, a plurality of modules or components may be combined or integrated into another system, or some features may be omitted, or not performed. The shown or discussed mutual coupling, direct coupling or communication connection may be an indirect coupling or communication connection of devices or modules through some interfaces, and may be in an electrical, mechanical or other form.
Modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on 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 the present embodiment.
In the above embodiments, the implementation may be wholly or partially realized 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. The procedures or functions according to the embodiments of the present application are wholly or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on or transmitted over 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 wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)), or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that includes one or more of the available media. The usable medium may be a read-only memory (ROM), or a 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 (DVD), or a semiconductor medium, such as a Solid State Disk (SSD).
Claims (10)
1. An oil return control method of a variable frequency air conditioner is characterized by comprising the following steps:
under the condition that the variable frequency air conditioner enters an oil return mode, adjusting the current frequency of the compressor to a preset oil return frequency to work;
acquiring room temperature and humidity requirements and acquiring air outlet temperature and humidity requirements of the variable frequency air conditioner, wherein the room temperature and humidity requirements are used for expressing first adjusting 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 expressing second adjusting 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;
and when the variable frequency air conditioner is in the oil return mode, controlling to perform temperature and humidity compensation operation according to the room temperature and humidity requirements and the air outlet temperature and humidity requirements of the variable frequency air conditioner.
2. The oil return control method for the variable-frequency air conditioner according to claim 1, wherein the room temperature and humidity requirements include a room temperature requirement and a room humidity requirement, and the acquiring the room temperature and humidity requirements includes:
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 between the current temperature and 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 or a second ratio of the current humidity and 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.
3. The oil return control method for the variable frequency air conditioner according to claim 2, wherein the outlet air temperature and humidity requirement comprises an outlet air temperature requirement and an outlet air humidity requirement, and the acquiring the outlet air temperature and humidity requirement of the variable frequency air conditioner comprises:
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 or a third ratio between the air-out temperature before oil return and the current air-out temperature, adjusting the third difference or the third ratio by adopting a third proportional coefficient, and calculating to obtain the air-out temperature requirement; and calculating a fourth difference or a fourth ratio of the air-out humidity before oil return and the current air-out humidity, adjusting the fourth difference or the fourth ratio by adopting a fourth proportionality coefficient, and calculating to obtain the air-out humidity requirement.
4. The oil return control method for the inverter air conditioner according to claim 3, wherein the controlling of the temperature and humidity compensation according to the room temperature and humidity requirement and the outlet air temperature and humidity requirement of the inverter air conditioner comprises:
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 a 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 preset mapping relation between the room temperature requirement, the air outlet temperature requirement and the temperature adjusting force of the heating element;
and controlling the heating element to work at the target temperature regulation force.
5. The oil return control method for the inverter air conditioner according to claim 4, wherein the temperature and humidity compensation operation is controlled according to the room temperature and humidity requirement and the outlet air temperature and humidity requirement of the inverter air conditioner, and further comprising:
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 outlet air humidity requirement according to a mapping relation between a preset outlet air humidity 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 a target humidity adjusting force of the humidifying element under the room humidity requirement and the outlet humidity requirement according to a preset mapping relation between the room humidity requirement, the outlet humidity requirement and the humidity adjusting force of the humidifying element;
and controlling the humidifying element to work at the target humidity adjusting force.
6. The oil return control method of the inverter air conditioner as claimed in claim 1, further comprising:
acquiring continuous accumulated time when the running frequency of a compressor of the variable frequency air conditioner is less 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 not, controlling the variable frequency air conditioner to enter the oil return mode.
7. The oil return control method for the inverter air conditioner according to any one of claims 1 to 6, 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 of the inverter air conditioner, the method further comprises:
and when the time length of the variable frequency air conditioner in the oil return mode reaches the preset oil return time length, the variable frequency air conditioner exits the oil return mode, and the variable frequency air conditioner is controlled to run in a state before entering the oil return mode.
8. The utility model provides a frequency conversion air conditioner oil return controlling means which characterized in that includes:
the air conditioner comprises a calculation module, a control module and a control module, wherein the calculation module is used for acquiring room temperature and humidity requirements and acquiring air outlet temperature and humidity requirements of the variable frequency air conditioner under the condition that the variable frequency air conditioner enters an oil return mode, the room temperature and humidity requirements are used for expressing first adjusting force required by deviation of current temperature and humidity of a room corresponding to the variable frequency air conditioner and expected temperature and humidity, and the air outlet temperature and humidity requirements are used for expressing second adjusting 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 temperature and humidity compensation operation according to the room temperature and humidity requirements and the air outlet temperature and humidity requirements of the inverter air conditioner when the inverter air conditioner is in the oil return mode.
9. An electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and the computer program, when executed by the processor, causes the processor to execute the steps of the oil return control method for inverter air conditioners according to any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that a computer program is stored, and when the computer program is executed by a processor, the processor is caused to execute the steps of the oil return control method for the inverter air conditioner according to any one of claims 1 to 7.
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