CN113007832B - Low-temperature refrigeration control method and device and air conditioner - Google Patents

Low-temperature refrigeration control method and device and air conditioner Download PDF

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Publication number
CN113007832B
CN113007832B CN202110426857.XA CN202110426857A CN113007832B CN 113007832 B CN113007832 B CN 113007832B CN 202110426857 A CN202110426857 A CN 202110426857A CN 113007832 B CN113007832 B CN 113007832B
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Prior art keywords
gear
temperature value
fan
temperature
controlling
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CN202110426857.XA
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CN113007832A (en
Inventor
刘怿宁
甘永健
吕阳
陈冬
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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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
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/001—Compression cycle type
    • 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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • 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
    • 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
    • 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
    • F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
    • F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
    • 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
    • F24F11/88—Electrical aspects, e.g. circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • 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 invention provides a low-temperature refrigeration control method and device and an air conditioner, and relates to the technical field of air conditioners. The low-temperature refrigeration control method comprises the following steps: an outer loop temperature value is received. And acquiring gear data of the external fan according to the outer ring temperature value, and controlling the external fan to operate according to an initial gear corresponding to the gear data of the external fan. And acquiring a target outer disc temperature value according to the outer ring temperature value. And receiving an outer disc temperature value. And controlling the operating gear of the external fan to be reduced until the operating gear is reduced to the lowest gear corresponding to the gear position data of the external fan or controlling the operating gear of the external fan to be increased until the operating gear is increased to the highest gear corresponding to the gear position data of the external fan according to the external disk temperature value and the target external disk temperature value. The invention also provides a low-temperature refrigeration control device and an air conditioner, which can execute the low-temperature refrigeration control method. The low-temperature refrigeration control method and device and the air conditioner provided by the invention can solve the technical problem that the refrigeration function of the air conditioner in the prior art cannot meet the requirements of users in a low-temperature environment.

Description

Low-temperature refrigeration control method and device and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a low-temperature refrigeration control method, a loading notification and an air conditioner.
Background
The air conditioner is generally applied to thousands of households, the use occasions of the air conditioner are more and more diversified, and the requirements on the use working range are wider. E.g., cryogenic refrigeration, usage scenario: the outdoor temperature is usually below zero, but the indoor temperature is higher, and generally, the outdoor temperature is in a closed place such as a room with a fire place, a conference room, a kitchen or a machine room, which is inconvenient to open windows and ventilate. At present, most air conditioners can not meet the function, so that each air conditioner manufacturer independently develops the low-temperature refrigeration function of the air conditioner as one of selling points.
Disclosure of Invention
The invention solves the technical problem that the refrigeration function of the air conditioner in the prior art cannot meet the requirements of users in a low-temperature environment.
In order to solve the above problems, the present invention provides a low temperature refrigeration control method applied to an air conditioner, the low temperature refrigeration control method comprising:
receiving an outer ring temperature value, wherein the outer ring temperature value represents the temperature of the environment where an outer unit of the air conditioner is located;
acquiring gear data of the outer fan according to the outer ring temperature value, and controlling the outer fan to operate according to an initial gear corresponding to the gear data of the outer fan;
acquiring a target outer disc temperature value according to the outer ring temperature value;
receiving an outer disc temperature value, wherein the outer disc temperature value represents a temperature of a coil within the outer machine;
and controlling the operating gear of the outer fan to be reduced until the operating gear of the outer fan is reduced to the lowest gear corresponding to the gear data of the outer fan or controlling the operating gear of the outer fan to be increased until the operating gear of the outer fan is increased to the highest gear corresponding to the gear data of the outer fan according to the outer disk temperature value and the target outer disk temperature value.
Compared with the prior art, the low-temperature refrigeration control method provided by the invention has the beneficial effects that:
under the condition that the air conditioner executes the low-temperature refrigeration control method, the outer fan of the air conditioner can adjust the operation gear according to various factors such as the temperature of the external environment, the temperature of a coil pipe inside the outer unit, the target temperature of the coil pipe of the outer unit and the like, so that the purpose of reducing or increasing the rotating speed of the outer fan is achieved, the exhaust temperature of the compressor and the temperature of the bottom of the compressor can be maintained in a reliable interval in a mode of adjusting the rotating speed of the outer fan, and the reliability of the operation of the compressor is ensured; and under the too high condition of the pressure of condenser, can also promote the mode reinforcing heat transfer effect of gear in order to promote the rotational speed through outer fan to reduce condenser pressure, can also improve the refrigerating capacity simultaneously. In summary, through the execution of the low-temperature refrigeration control method, the operation stability of the compressor can be ensured when the air conditioner is in a low-temperature environment in an external environment, and meanwhile, the over-high pressure of the condenser can be prevented and the refrigeration effect can be improved, so that the technical problem that the refrigeration function of the air conditioner in the prior art cannot meet the user requirement in the low-temperature environment is solved.
Optionally, the step of controlling the operating gear of the outer fan to decrease until the operating gear of the outer fan decreases to the lowest gear corresponding to the gear data of the outer fan according to the outer disc temperature value and the target outer disc temperature value, or controlling the operating gear of the outer fan to increase until the operating gear of the outer fan increases to the highest gear corresponding to the gear data of the outer fan includes:
judging whether the outer disk temperature value is larger than the target outer disk temperature value or not;
if the outer disk temperature value is less than or equal to the target outer disk temperature value, controlling the outer fan to lower the gear;
after controlling the outer fan to lower the gear, controlling the outer fan to continuously operate for a first preset time in the gear after the gear is lowered, and then returning to the step of judging whether the outer disc temperature value is greater than the target outer disc temperature value until the gear operated by the outer fan is increased to the highest gear or reduced to the lowest gear;
if the outer disk temperature value is larger than the target outer disk temperature value, controlling the outer fan to lift gears;
after the outer fan is controlled to lift the gear, the outer fan is controlled to continuously run for a second preset time in the gear after the gear is lifted, and then the step of judging whether the outer disc temperature value is larger than the target outer disc temperature value is executed again until the gear of the outer fan is lifted to the highest gear or reduced to the lowest gear;
the first preset time is greater than or equal to the second preset time.
When the outer disk temperature value is less than or equal to the target outer disk temperature value, the exhaust temperature of the compressor and the temperature at the bottom of the compressor are low, so that the purpose of reducing the rotating speed of the outer fan can be achieved by reducing the gear of the outer fan, the exhaust temperature of the compressor and the temperature at the bottom of the compressor can be increased, and the stability of the compressor can be ensured. In addition, under the condition that the outer disc temperature value is greater than the target outer disc temperature value, the temperature of the outer disc is indicated to reach the preset temperature, under the condition, the purpose of increasing the rotating speed of the outer fan can be achieved in a mode of increasing the gear of the outer fan, therefore, the pressure of the condenser is reduced, and meanwhile, the refrigerating capacity can be improved. In other words, the rotating speed of the outer fan can be kept in a low-speed or stopped state for a long time in this way, so that the exhaust temperature and the temperature at the bottom of the compressor are ensured to be in a higher state, and the running stability of the compressor is improved. And can also promote through the gear of outer fan and lead to outer fan rotational speed increase under the too big condition of pressure of condenser to realize the reinforcing heat transfer, reduce the pressure of condenser and promote the purpose of refrigerating output.
A low-temperature refrigeration control device is applied to an air conditioner and comprises:
a first receiving module configured to receive an outer ring temperature value, wherein the outer ring temperature value represents a temperature of an environment in which an external unit of the air conditioner is located;
the first control module is configured to acquire gear data of the outer fan according to the outer ring temperature value and control the outer fan to operate according to an initial gear corresponding to the gear data of the outer fan;
the acquisition module is configured to acquire a target outer disc temperature value according to the outer ring temperature value;
a second receiving module configured to receive an outer pan temperature value, wherein the outer pan temperature value represents a temperature of a coil within the outer machine;
and the second control module is configured to control the operating gear of the external fan to be lowered until the operating gear of the external fan is lowered to the lowest gear corresponding to the gear data of the external fan or control the operating gear of the external fan to be raised until the operating gear of the external fan is raised to the highest gear corresponding to the gear data of the external fan according to the external disk temperature value and the target external disk temperature value.
An air conditioner includes a controller configured to a low temperature refrigeration control method. The low-temperature refrigeration control method comprises the following steps:
receiving an outer ring temperature value, wherein the outer ring temperature value represents the temperature of the environment where an outer unit of the air conditioner is located;
acquiring gear data of the outer fan according to the outer ring temperature value, and controlling the outer fan to operate according to an initial gear corresponding to the gear data of the outer fan;
acquiring a target outer disc temperature value according to the outer ring temperature value;
receiving an outer disc temperature value, wherein the outer disc temperature value represents a temperature of a coil within the outer machine;
and controlling the operating gear of the outer fan to be lowered until the operating gear of the outer fan is lowered to the lowest gear corresponding to the gear data of the outer fan or controlling the operating gear of the outer fan to be lifted until the operating gear of the outer fan is lifted to the highest gear corresponding to the gear data of the outer fan according to the temperature value of the outer disk and the target temperature value of the outer disk.
The invention also provides a low-temperature refrigeration control device and an air conditioner, wherein the low-temperature refrigeration control device and the air conditioner adopt the low-temperature refrigeration control method, and the beneficial effects of the low-temperature refrigeration control device and the air conditioner relative to the prior art are the same as the beneficial effects of the low-temperature refrigeration control method relative to the prior art, and are not repeated herein.
Drawings
Fig. 1 is a schematic structural diagram of an air conditioner provided in an embodiment of the present application;
fig. 2 is a block diagram of an air conditioner provided in an embodiment of the present application;
fig. 3 is a flowchart of a cryogenic refrigeration control method provided in an embodiment of the present application;
fig. 4 is a flowchart of step S22 in the low-temperature refrigeration control method provided in the embodiment of the present application;
fig. 5 is a flowchart of step S50 in the low-temperature refrigeration control method provided in the embodiment of the present application;
FIG. 6 is a flow chart of another portion of a method of controlling cryogenic refrigeration provided in an embodiment of the present application;
fig. 7 is a flowchart of step S61 in the low-temperature refrigeration control method provided in the embodiment of the present application;
FIG. 8 is a flow chart of another portion of a method of controlling cryogenic refrigeration provided in an embodiment of the present application;
fig. 9 is a flowchart of a portion of a low temperature refrigeration control method provided in an embodiment of the present application;
fig. 10 is a functional block diagram of a low-temperature refrigeration control device according to an embodiment of the present disclosure;
fig. 11 is a graph illustrating a relationship between an outer ring temperature value and a predetermined time value according to the present application.
Description of reference numerals:
1-an air conditioner; 2-a compressor; 3-an external fan; 4-a four-way valve; 5-a condenser; 6-an evaporator; 7-an expansion valve; 8-a controller; 01-first temperature detection means; 02-second temperature detection means; 03-a third temperature detection device; 04-fourth temperature detection means; 05-a fifth temperature detection device; 10-a first receiving module; 20-a second receiving module; 30-a third receiving module; 40-a first control module; 50-a second control module; 60-a third control module; 70-obtaining module.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1, the present application provides an air conditioner 1, wherein the air conditioner 1 is configured to be installed in a designated area and provide air conditioning effect to the designated area to improve air quality of the designated area and improve user comfort. It should be noted that the air conditioning function includes, but is not limited to, a temperature conditioning function, a humidity conditioning function, a fresh air function, and an air flow speed conditioning function.
The air conditioner 1 comprises an inner machine and an outer machine, wherein an evaporator 6 is arranged in the inner machine, and a compressor 2, an expansion valve 7, a four-way valve 4 and a condenser 5 are arranged in the outer machine. The outlet and the inlet of the compressor 2 are respectively connected with two interfaces of the four-way valve 4; one port of the evaporator 6 is connected to the third interface of the four-way valve 4, one port of the condenser 5 is connected to the fourth interface of the four-way valve 4, the expansion valve 7 is arranged between the evaporator 6 and the condenser 5, and two ends of the expansion valve 7 are respectively connected to the other port of the evaporator 6 and the other port of the condenser 5. In the case of the cooling mode, the refrigerant is guided out of the compressor 2, then flows through the four-way valve 4, the condenser 5, the expansion valve 7, the evaporator 6, and the four-way valve 4 in this order, and then is guided into the compressor 2 at the inlet of the compressor 2.
In addition, referring to fig. 2, in the embodiment of the present application, the air conditioner 1 may further include a first temperature detection device 01, a second temperature detection device 02, a third temperature detection device 03, a fourth temperature detection device 04, and a fifth temperature detection device 05. Wherein the first temperature detection device 01 is provided on the internal machine, and in the case where the internal machine is installed inside the designated area, the first temperature detection device 01 is configured to detect the temperature of the designated area, that is, the inner ring temperature value. The second temperature detecting means 02 is provided on the evaporator 6, and the second temperature detecting means 02 is configured to detect the temperature of the coil of the evaporator 6, i.e. the inner disc temperature value. The third temperature detecting device 03 is disposed at the air inlet of the evaporator 6, and the third temperature detecting device 03 is configured to detect the temperature of the refrigerant at the air inlet of the evaporator 6, that is, an inner tube intake temperature value. The fourth temperature detecting means 04 is disposed on the condenser 5, and the fourth temperature detecting means 04 is configured to detect the temperature of the coil of the condenser 5, i.e., an outer-coil temperature value. The fifth temperature detection device 05 is provided on the outdoor unit, and in the case where the outdoor unit is installed in an environment outside a specified area, the fifth temperature detection device 05 is configured to detect the temperature of the external environment, i.e., an external environment temperature value.
Of course, in the embodiment of the present application, the air conditioner 1 may further include a controller 8, and the compressor 2, the outer fan 3 in the outer unit, the four-way valve 4, the first temperature detection device 01, the second temperature detection device 02, the third temperature detection device 03, the fourth temperature detection device 04, and the fifth temperature detection device 05 may be electrically connected to the controller 8. The controller 8 may be configured to control the compressor 2 to adjust the operating frequency; the controller 8 is further configured to control the external fan 3 to adjust the operation gear, in other words, the controller 8 can control the external fan 3 to adjust the operation speed; the controller 8 is also configured to control the four-way valve 4 to switch valve positions, so that the air conditioner 1 can switch between a cooling mode and a heating mode; the controller 8 is further configured to receive an inner ring temperature value sent by the first temperature detection device 01, an inner disc temperature value sent by the second temperature detection device 02, an inner tube intake temperature value sent by the third temperature detection device 03, an outer disc temperature value sent by the fourth temperature detection device 04, and an outer ring temperature value sent by the fifth temperature detection device 05.
Alternatively, the controller 8 may be an integrated circuit chip with signal processing capabilities. The controller 8 may be a general-purpose processor, and may include a Central Processing Unit (CPU), a single chip Microcomputer (MCU), a Micro Controller Unit (MCU), a Complex Programmable Logic Device (CPLD), a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), an embedded ARM, and other chips, where the controller 8 may implement or execute the methods, steps, and Logic blocks disclosed in the embodiments of the present invention.
In a possible embodiment, the air conditioner 1 may further include a memory for storing program instructions executable by the controller 8, for example, a low temperature refrigeration control device provided in the embodiment of the present application, and the low temperature refrigeration control device provided in the embodiment of the present application includes at least one program stored in the memory in the form of software or firmware. The Memory may be a stand-alone external Memory including, but not limited to, Random Access Memory (RAM), Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Read-Only Memory (EPROM), electrically Erasable Read-Only Memory (EEPROM). The memory may also be integrated with the controller 8, for example the memory may be integrated with the controller 8 in the same chip.
Based on the air conditioner 1 provided above, the present application further provides a low temperature refrigeration control method for improving the technical problem that the refrigeration function of the air conditioner 1 in the prior art cannot meet the user requirement in the low temperature environment.
Referring to fig. 3, the low-temperature refrigeration control method includes:
and step S10, receiving the outer ring temperature value.
The outer ring temperature value represents the temperature of the environment where the external unit of the air conditioner 1 is located, and is detected and sent by the fifth temperature detection device 05, and the controller 8 can receive the high outer ring temperature value, in other words, in the case where the internal unit is installed in the designated area and the external unit is installed in the environment outside the designated area, the outer ring temperature value represents the temperature of the environment outside the designated area.
Before entering the control step for the external fan 3, the low-temperature refrigeration control method may further include:
and step S12, judging whether the outer ring temperature value is less than or equal to a fourth preset temperature value.
The fourth preset temperature value represents a threshold value for starting the low-temperature refrigeration mode; in other words, the air conditioner 1 may be controlled to operate in the low temperature cooling mode when the outer loop temperature value reaches the fourth preset temperature value, so as to improve the above technical problem.
And step S14, if the outer ring temperature value is less than or equal to the fourth preset temperature value, controlling the air conditioner 1 to enter a low-temperature refrigeration mode.
In other words, if the determination result in step S12 is yes, the air conditioner 1 may be controlled to enter the low temperature cooling mode.
Of course, if the determination result in step S12 is negative, it indicates that the outer-ring temperature value is greater than the fourth preset temperature value, and in this case, it indicates that the temperature of the outer environment is high, and the normal cooling mode can be executed.
It should be noted that the air conditioner 1 provided in the present application is described by way of example in an area where it is inconvenient to open windows and ventilate, such as a fireplace room, a conference room, a kitchen, or a machine room. Based on the above-mentioned regions, optionally, in some embodiments of the present application, in order to ensure that a stable refrigeration effect is provided for a specific region and improve the problem that the compressor 2 fails due to too low temperature in a low-temperature environment, the fourth preset temperature value may have a value in a range of 0 to 12 ℃, in other words, the value of the fourth preset temperature value may be 1 ℃, 2 ℃, 3 ℃, 4 ℃, 5 ℃, 6 ℃, 7 ℃, 8 ℃, 9 ℃, 10 ℃, 11 ℃, or 12 ℃. In the embodiments of the present application, the fourth preset temperature is greater than 10 ℃.
In the case where the air conditioner 1 enters the low temperature cooling mode, the low temperature cooling control method includes:
and S20, acquiring gear data of the outer fan 3 according to the outer ring temperature value, and controlling the outer fan 3 to operate according to an initial gear corresponding to the gear data of the outer fan 3.
It should be noted that, in order to ensure that the control of the low-temperature refrigeration can be accurately and effectively performed, the gear setting of the outer fan 3 may be different when the outer ring temperature value is different. The gear data of the outer fan 3 correspondingly comprises the lowest gear of the outer fan 3, the highest gear of the outer fan 3, the initial gear of the outer fan 3 and the like.
Alternatively, in the case where the motor of the outer fan 3 is a direct current motor, the rotational speed of each divided portion may be uniformly divided into N equal divisions from zero to the maximum rotational speed at which the motor is operable, and each equal division may correspond to one gear. For example, the maximum speed at which the motor can operate is 1000 r/min; if N is 10, marking off a zero gear to a ten gear; the rotating speed corresponding to the zero gear is zero, and the outer fan 3 can also be considered to be stopped; the first gear to the tenth gear respectively correspond to 100r/min, 200r/min, 300r/min, 400r/min, 500r/min, 600r/min, 700r/min, 800r/min, 900r/min and 1000 r/min. In addition, it should be noted that, in some embodiments of the present application, a value of N is greater than 5, and N is a positive integer.
Of course, the value of N can also be adjusted in the case of different outer ring temperatures. For example, in some embodiments of the present application, in a case where the outer ring temperature value is less than or equal to the fourth preset temperature value and greater than or equal to 10 ℃, the gear of the motor is divided into first gear to N gear1Gear in which N1N, while the initial gear may be fifth gear; under the condition that the temperature value of the outer ring is less than 10 ℃ and more than or equal to 5 ℃, the gears of the motor are divided into zero gear to N gear2Gear in which N2N, while the initial gear may be fourth gear; under the condition that the temperature value of the outer ring is less than 5 ℃ and greater than or equal to 0, dividing the gears of the motor into zero gear to N gear3Gear in which N3Equal to N-1, and the initial gear can be a third gear; under the condition that the temperature value of the outer ring is less than 0 and greater than or equal to minus 5 ℃, the gears of the motor are divided into zero gear to N gear4Gear in which N4Equal to N-2, while the initial gear may be second gear; under the condition that the temperature value of the outer ring is less than-5 ℃ and more than or equal to-10 ℃, the gears of the motor are divided into zero gear to N gear5Gear in which N5Gear is equal to N-3, meanwhile, the initial gear can be a first gear; when the temperature value of the outer ring is less than-10 ℃ and more than or equal to-15 ℃, the gears of the motor are divided into zero gear to N gear6Gear in which N6The gear is equal to N-4, and meanwhile, the initial gear can be a first gear; under the condition that the temperature value of the outer ring is less than-15 ℃, the gears of the motor are divided into zero gear to N gear7Gear in which N7Gear is equal to N-5, while the initial gear may be first gear. Of course, in other embodiments of the present application, other temperature intervals may also be set for dividing the gear of the dc motor, and similarly, other manners may also be adopted for dividing the gear corresponding to each temperature interval.
In addition, in the case where the motor of the external fan 3 is an ac motor, there are only three cases due to the gear setting of the ac motor: a first case, high wind and stop; the second case, high gear, low gear and stop gear; the third case, high gear, medium gear, low gear and stop gear.
Therefore, in some embodiments of the present application, in the case where the motor of the outer fan 3 is an ac motor, the highest gear of the outer fan 3 is a high gear, and the lowest gear is a stop gear. In addition, the control of the initial gear of the outer fan 3 according to the outer ring temperature value is as follows: under the condition that the outer ring temperature value is less than or equal to the fourth preset temperature value and is greater than or equal to 10 ℃, the initial gear can be a high-wind gear, so that any type of alternating current motor can be suitable under the condition; under the condition that the temperature value of the outer ring is less than 10 ℃ and greater than or equal to 5 ℃, the initial gear can be a medium-wind gear, and certainly, under the condition that the alternating current motors under the first condition and the second condition are adopted, the initial gear is a high-wind gear; when the temperature value of the outer ring is less than 5 ℃ and greater than or equal to 0, the initial gear can be a medium-wind gear, and certainly, when the alternating current motors in the first case and the second case are adopted, the initial gear is a high-wind gear; when the outer ring temperature value is less than 0 and greater than or equal to-5 ℃, the initial gear may be a low gear, and of course, when the alternating current motor in the first case is adopted, the initial gear may be a high gear; under the condition that the temperature value of the outer ring is less than-5 ℃ and greater than or equal to-10 ℃, the initial gear can be a low wind gear, and certainly, under the condition that the alternating current motor under the first condition is adopted, the initial gear can be a high wind gear; when the outer ring temperature value is less than-10 ℃ and greater than or equal to-15 ℃, the initial gear can be a low wind gear, and certainly, the initial gear can be a high wind gear under the condition that the alternating current motor under the first condition is adopted; in the case where the outer ring temperature value is less than-15 ℃, the initial gear may be a low gear, and of course, in the case where the ac motor of the first case is used, the initial gear may be a high gear.
Referring to fig. 4, after the gear positions of the external fan 3 are determined in step S20, the method for controlling low temperature cooling includes:
and step S22, acquiring a temperature value of the starting outer disc according to the outer ring temperature value.
Wherein the on outer disk temperature value indicates the temperature of the outer disk when the outer fan 3 is started in the initial gear. It can also be regarded as the temperature of the outer panel when the air conditioner 1 enters the low temperature cooling mode.
It should be noted that, under the condition that the outer ring temperature values are different, the temperature of the start outer disc temperature value is different due to the influence of the outer ring temperature, and under the condition that the outer ring temperature value is lower, the obtained start outer disc temperature value is lower. Optionally, in order to reduce the control cost of the controller 8, the air conditioner 1 is conveniently subjected to low-temperature refrigeration control, different opening outer disc temperature values are set for different temperature intervals, optionally, a plurality of temperature intervals can be divided, the outer ring temperature corresponding to each temperature interval is gradually reduced, and a plurality of opening outer disc temperature values corresponding to the plurality of temperature intervals with gradually reduced temperatures in a one-to-one manner also tend to be gradually reduced.
Referring to fig. 3, in step S30, the target outer disc temperature value is obtained according to the outer ring temperature value.
It should be noted that, corresponding target outer disc temperature values are different under the condition that the outer ring temperature values are different, and in some embodiments of the present application, the obtained target outer disc temperature value is lower under the condition that the outer ring temperature value is lower. Optionally, a plurality of temperature intervals may be divided, the outer ring temperature corresponding to each temperature interval gradually decreases, and a plurality of target outer disc temperature values corresponding to the plurality of temperature intervals with gradually decreasing temperatures in a one-to-one manner also have a gradually decreasing trend.
And step S40, receiving the outer disk temperature value.
Wherein, the outer dish temperature value represents the temperature of the coil pipe in the outer machine, and this outer dish temperature value is detected and is sent by the above-mentioned fourth temperature-detecting device 04 that provides, and this outer dish temperature value can be received to controller 8.
And step S50, controlling the operating gear of the outer fan 3 to be lowered until the operating gear of the outer fan 3 is lowered to the lowest gear corresponding to the gear data of the outer fan 3, or controlling the operating gear of the outer fan 3 to be lifted until the operating gear of the outer fan 3 is lifted to the highest gear corresponding to the gear data of the outer fan 3 according to the outer disk temperature value and the target outer disk temperature value.
Under the condition that the air conditioner 1 executes the low-temperature refrigeration control method, the outer fan 3 of the air conditioner 1 can adjust the operation gear according to various factors such as the temperature of the external environment, the temperature of a coil pipe inside the outer unit, the target temperature of the coil pipe of the outer unit and the like, so that the purpose of reducing or increasing the rotating speed of the outer fan 3 is achieved, the exhaust temperature of the compressor 2 and the temperature of the bottom of the compressor 2 can be maintained in a reliable interval in a mode of adjusting the rotating speed of the outer fan 3, and the operation reliability of the compressor 2 is ensured; and under the too high condition of condenser 5's pressure, can also promote the mode reinforcing heat transfer effect of gear in order to promote the rotational speed through outer fan 3 to reduce condenser 5 pressure, can also improve the refrigerating capacity simultaneously. In summary, through the implementation of the low-temperature refrigeration control method, the operation stability of the compressor 2 can be ensured when the air conditioner 1 is in a low-temperature environment in an external environment, and meanwhile, the over-high pressure of the condenser 5 can be prevented and the refrigeration effect can be improved, so that the technical problem that the refrigeration function of the air conditioner 1 cannot meet the user requirement in the low-temperature environment in the prior art is solved.
Alternatively, referring to fig. 5, step S50 may include:
and step S510, judging whether the outer disk temperature value is larger than the target outer disk temperature value.
And step S520, if the temperature value of the outer disk is less than or equal to the target temperature value of the outer disk, controlling the outer fan 3 to lower the gear.
In other words, in the case where the determination result in step S510 is no, the outside fan 3 is controlled to lower the gear. Optionally, in the embodiment of the present application, when the external fan 3 is controlled to lower the operating gear, the controller 8 controls the gear of the external fan 3 to be gradually decreased. Of course, in other embodiments of the present application, the outer fan 3 may be controlled to lower the gear in other manners, for example, a plurality of gears may be lowered at one time when the temperature difference is large.
After controlling the outer fan 3 to lower the gear at step S520, step S50 includes:
and step S530, controlling the outer fan 3 to continuously operate for a first preset time at a gear position after the gear position is reduced, and then returning to the step of judging whether the outer disc temperature value is greater than the target outer disc temperature value until the gear position of the outer fan 3 is increased to the highest gear position or reduced to the lowest gear position.
After the outer fan 3 is controlled to reduce the operation gear, the outer fan 3 is controlled to continuously operate for a period of time at the reduced gear, and the judgment can be performed after the compressor 2 and the condenser 5 are stably operated, so that the misjudgment of each parameter can be prevented, and the problems that the temperature fluctuation of the compressor 2 is large and the pressure fluctuation of the condenser 5 is large are caused.
In addition, step S530 may also be regarded as returning to continue to perform step S510 after continuously operating in the gear after the gear is lowered for the first preset time until the gear in which the external air blower 3 operates is lowered to the lowest gear or raised to the highest gear.
Of course, after step S510, step S50 further includes:
and S540, if the temperature value of the outer disk is greater than the target temperature value, controlling the outer fan 3 to lift the gear.
In other words, if the determination result in step S510 is yes, the outer fan 3 is controlled to raise the gear. Optionally, in the embodiment of the present application, when the gear of the external air blower 3 is controlled to be lifted, the controller 8 controls the gear of the external air blower 3 to be gradually increased. Of course, in other embodiments of the present application, the external fan 3 may also be controlled to raise the gear in other manners, for example, multiple gears may be raised at one time when the temperature difference is large.
After controlling the outside fan 3 to raise the gear at step S540, step S50 includes:
and S550, controlling the outer fan 3 to continuously operate for a second preset time at a gear position after the gear position is lifted, and then returning to the step of judging whether the outer disc temperature value is greater than the target outer disc temperature value until the gear position of the outer fan 3 is lifted to the highest gear position or reduced to the lowest gear position.
It should be noted that, in order to ensure the operation stability of the compressor 2 and at the same time ensure the pressure stability of the condenser 5, the first preset time is greater than or equal to the second preset time.
After controlling the outer fan 3 to lift the operating gear, controlling the outer fan 3 to continuously operate for a period of time at the lifted gear can ensure that the compressor 2 and the condenser 5 are judged again after stable operation, thereby preventing misjudgment of each parameter and causing the problems of large temperature fluctuation of the compressor 2 and large pressure fluctuation of the condenser 5.
In addition, step S550 may also be regarded as returning to continue to execute step S510 after continuously operating in the gear after the gear is lifted for the second preset time until the gear in which the external air blower 3 operates is lowered to the lowest gear or lifted to the highest gear.
As described above, when the outer tray temperature value is less than or equal to the target outer tray temperature value, it indicates that the discharge temperature of the compressor 2 and the temperature at the bottom of the compressor 2 are low, so that the rotation speed of the outer fan 3 can be reduced by reducing the gear of the outer fan 3, and the discharge temperature of the compressor 2 and the temperature at the bottom of the compressor 2 can be increased to ensure the stability of the compressor 2. In addition, under the condition that the outer disc temperature value is greater than the target outer disc temperature value, the temperature of the outer disc is indicated to reach the preset temperature, and under the condition, the purpose of increasing the rotating speed of the outer fan 3 can be achieved in a mode of increasing the gear of the outer fan 3, so that the pressure of the condenser 5 is reduced, and meanwhile, the refrigerating capacity can be improved. In other words, the rotation speed of the outer fan 3 can be maintained at a low speed or stopped state for a long time in this manner to ensure that the discharge temperature and the temperature of the bottom of the compressor 2 are in a high state, thereby improving the operation stability of the compressor 2. And can also promote through the gear of outer fan 3 and lead to the increase of 3 rotational speeds of outer fan under the too big condition of pressure of condenser 5 to realize the reinforcing heat transfer, reduce the pressure of condenser 5 and promote the purpose of refrigerating output.
In addition, referring to fig. 6, in the low-temperature cooling control method, after the gear of the external fan 3 is lowered to the lowest gear, the low-temperature cooling control method may further include:
and step S60, receiving the air inlet temperature value of the inner pipe.
In the embodiment of the present application, the air intake temperature value of the inner tube is detected and sent by the third temperature detecting device 03, and the controller 8 may receive the air intake temperature value of the inner tube.
And step S61, controlling the outer fan 3 to operate at a preset gear according to the outer disc temperature value, the opening outer disc temperature value and the inner pipe air inlet temperature value.
It should be noted that, in the embodiment of the present application, the motor is taken as a dc motor for example, and the preset gear may be a first gear. Of course, in other embodiments of the present application, the preset gear may also be second gear, third gear, or the like.
Alternatively, referring to fig. 7, step S61 may include:
and step S611, judging whether the temperature value of the outer disk is greater than or equal to the temperature value of the starting outer disk.
Step S612, if the outer plate temperature value is larger than or equal to the opening outer plate temperature value, judging whether the air inlet temperature value of the inner pipe is larger than or equal to a first preset temperature value.
Alternatively, in order to ensure the operation stability of the compressor 2, the first preset temperature value may range from 0 ℃ to 5 ℃, in other words, the first preset temperature value may range from 0 ℃, 1 ℃, 2 ℃, 3 ℃, 4 ℃, 5 ℃, or the like.
Step S613, if the intake temperature value of the inner pipe is greater than or equal to the first preset temperature value, controlling the outer fan 3 to start operation at a preset gear.
In other words, in the case where both the determination results in step S611 and step S612 are yes, the outside air blower 3 may be controlled to start operation at the preset gear.
Wherein, when the outer plate temperature value is greater than or equal to the outer plate temperature value of opening, and the inner tube temperature value of admitting air is greater than or equal to the first condition of predetermineeing the temperature value, it is great consequently to show pressure in the condenser 5, needs to improve the heat transfer effect through the mode of outer fan 3 operation to reduce the pressure of condenser 5, thereby ensure the steady operation of low temperature refrigeration mode.
In addition, in the case where one of the determination results in step S611 and step S612 is negative, the state where the outer fan 3 is operated at the lowest gear is maintained.
In addition, referring to fig. 8, in the low-temperature refrigeration control method, after the gear of the external fan 3 is reduced to the lowest gear, the low-temperature refrigeration control method may further include:
and step S70, acquiring the duration value.
Wherein the duration value represents the time during which the outer fan 3 is in the lowest gear. When the outer ring temperature value is not higher than 10 ℃, the lowest gear of the outer fan 3 is zero gear, in other words, the outer fan 3 is stopped. Therefore, in the case where the outer ring temperature value is not higher than 10 ℃, the duration value can also be regarded as the downtime value of the outer fan 3.
It should be noted that the duration value may be obtained by the controller 8 directly from the outer fan 3, for example, in the case where the controller 8 controls the outer fan 3 to operate at the lowest gear, the duration value is obtained by starting to count the duration value.
And step S71, acquiring a preset time value according to the outer ring temperature value.
Wherein the preset time value represents the maximum time for which the external fan 3 is allowed to stop. In step S71, the preset time value may be obtained by: and acquiring a preset time value corresponding to the temperature interval according to the temperature interval in which the outer ring temperature value is positioned. The temperature intervals are multiple and continuous, the temperatures corresponding to the temperature intervals are sequentially reduced, and the preset time values corresponding to the temperature intervals with sequentially reduced temperatures, one to one, are sequentially reduced, as shown in fig. 11, a relationship between an outer ring temperature value and the preset time value is shown in fig. 11, where an abscissa in fig. 11 represents the outer ring temperature value, an ordinate represents the preset time value, and a curve represents a change condition of a corresponding relationship between the outer ring temperature value and the preset time value.
And step S72, if the duration value reaches the preset time value, controlling the outer fan 3 to start to operate at a preset gear.
It should be noted that, in the case that the external fan 3 operates at the lowest gear or the downtime is too long, the pressure in the condenser 5 is too high, thereby causing a system fault, and therefore, in the case that the external fan 3 operates at the lowest gear or the downtime reaches the preset time value, the external fan 3 needs to be controlled to operate at the preset gear, thereby preventing the fault caused by the too high pressure in the condenser 5, and ensuring the stability and reliability of the system.
Of course, after step S613 and step S72, the flow returns to continue to step S50.
In addition, referring to fig. 9, the low-temperature refrigeration control method may further include:
and step S80, judging whether the air inlet temperature value of the inner pipe is less than or equal to a third preset temperature value.
And step S81, if the air inlet temperature value of the inner pipe is less than or equal to a third preset temperature value, controlling the compressor 2 and the outer fan 3 of the air conditioner 1 to stop.
Alternatively, the third preset temperature value may range from-12 ℃ to-8 ℃, in other words, the third preset temperature value may range from-12 ℃, 11 ℃, 10 ℃, 9 ℃ or-8 ℃, and the like.
It should be noted that, in the case where the inner-tube intake air temperature value is less than or equal to the third preset temperature value, it indicates that the temperature of the inner-tube evaporator 6 is too low, and a phenomenon of frosting may occur, and therefore, in the case where the determination result in step S80 is yes, it is necessary to enter the defrosting mode of the evaporator 6 according to step S81 to prevent a system failure.
In addition, after step S81, the low temperature refrigeration control method may further include:
and step S82, judging whether the inner tube surprise temperature value is greater than or equal to a second preset temperature value.
And the second preset temperature value is greater than the third preset temperature value. Optionally, the value range of the second preset temperature value may be 0 to 5 ℃; in other words, the second predetermined temperature value can be 0 ℃, 1 ℃, 2 ℃, 3 ℃, 4 ℃ or 5 ℃ or the like.
And step S83, if the air inlet temperature value of the inner pipe is greater than or equal to a second preset temperature value, returning to the step of continuously executing the step of controlling the operation of the outer fan 3 according to the initial gear corresponding to the gear data of the outer fan 3.
In other words, in the case where the determination result in step S82 is yes, it indicates that the defrosting operation of the internal unit evaporator 6 is completed, and thus it is possible to continue to enter the low-temperature refrigeration control mode to ensure the operation stability of the compressor 2 and the pressure stability of the condenser 5.
As described above, the low-temperature refrigeration control method provided in the embodiment of the present application may indicate that the discharge temperature of the compressor 2 and the temperature at the bottom of the compressor 2 are low when the outer tray temperature value is less than or equal to the target outer tray temperature value, so that the purpose of reducing the rotation speed of the outer fan 3 may be achieved by reducing the gear of the outer fan 3, and thus the discharge temperature of the compressor 2 and the temperature at the bottom of the compressor 2 may be increased, so as to ensure the stability of the compressor 2. In addition, under the condition that the outer disc temperature value is greater than the target outer disc temperature value, the temperature of the outer disc is indicated to reach the preset temperature, and under the condition, the purpose of increasing the rotating speed of the outer fan 3 can be achieved in a mode of increasing the gear of the outer fan 3, so that the pressure of the condenser 5 is reduced, and meanwhile, the refrigerating capacity can be improved. In other words, the rotation speed of the outer fan 3 can be maintained at a low speed or stopped state for a long time in this manner to ensure that the discharge temperature and the temperature of the bottom of the compressor 2 are in a high state, thereby improving the operation stability of the compressor 2. And can also promote through the gear of outer fan 3 and lead to the increase of 3 rotational speeds of outer fan under the too big condition of pressure of condenser 5 to realize the reinforcing heat transfer, reduce the pressure of condenser 5 and promote the purpose of refrigerating output. Also, the defrost mode can be operated under the condition that the temperature of the interior evaporator 6 is low to prevent a system failure, thereby further ensuring the operation stability of the air conditioner 1.
Referring to fig. 10, in order to execute possible steps of the low-temperature refrigeration control method provided in each of the above embodiments, fig. 10 is a schematic diagram illustrating functional modules of a low-temperature refrigeration control apparatus provided in an embodiment of the present application. The low-temperature refrigeration control device is applied to the air conditioner 1, and the low-temperature refrigeration control device provided by the embodiment of the application is used for executing the low-temperature refrigeration control method. It should be noted that the basic principle and the technical effects of the low-temperature refrigeration control device provided in the present embodiment are substantially the same as those of the embodiments described above, and for the sake of brief description, no part of the present embodiment is mentioned, and reference may be made to the corresponding contents in the embodiments described above.
The low-temperature refrigeration control device comprises a first receiving module 10, a first control module 40, a second receiving module 20, a second control module 50 and an obtaining module 70.
The first receiving module 10 is configured to receive an outer-loop temperature value, wherein the outer-loop temperature value represents a temperature of an environment in which an external unit of the air conditioner 1 is located.
Optionally, the first receiving module 10 is configured to execute step S10 in the above-mentioned respective figures to achieve the corresponding technical effect.
The first control module 40 is configured to obtain the gear data of the outer fan 3 according to the outer ring temperature value, and control the operation of the outer fan 3 according to the initial gear corresponding to the gear data of the outer fan 3.
Optionally, the first control module 40 is configured to perform step S20 in the above-described respective figures to achieve a corresponding technical effect.
The obtaining module 70 is configured to obtain a target outer disc temperature value according to the outer ring temperature value.
Optionally, the obtaining module 70 is configured to perform step S30 in the above-mentioned respective figures to achieve the corresponding technical effect.
In addition, the obtaining module 70 is further configured to obtain the opening outer disc temperature value according to the outer ring temperature value.
Optionally, the obtaining module 70 is further configured to execute step S22 in the above-mentioned respective figures to achieve the corresponding technical effect.
Additionally, the obtaining module 70 is further configured to obtain the duration value.
Optionally, the obtaining module 70 is further configured to execute step S70 in the above-mentioned respective figures to achieve the corresponding technical effect.
The second receiving module 20 is configured to receive an outer disc temperature value, wherein the outer disc temperature value represents a temperature of a coil within the outer machine.
The obtaining module 70 is further configured to obtain a preset time value according to the outer ring temperature value.
Optionally, the obtaining module 70 is further configured to execute step S71 in the above-mentioned respective figures to achieve the corresponding technical effect.
Optionally, the second receiving module 20 is configured to execute step S40 in the above-mentioned respective figures to achieve the corresponding technical effect.
The second control module 50 is configured to control the operating gear of the outer fan 3 to be reduced until the operating gear of the outer fan 3 is reduced to the lowest gear corresponding to the gear data of the outer fan 3 according to the outer disc temperature value and the target outer disc temperature value, or control the operating gear of the outer fan 3 to be increased until the operating gear of the outer fan 3 is increased to the highest gear corresponding to the gear data of the outer fan 3.
Optionally, the second control module 50 is configured to perform step S50 and its sub-steps in the various figures described above to achieve corresponding technical effects.
In addition, the low temperature refrigeration control apparatus may further include a third receiving module 30 and a third control module 60.
The third receiving module 30 is configured to receive an inner tube intake temperature value.
Optionally, the third receiving module 30 is configured to execute step S60 in the above-mentioned respective figures to achieve the corresponding technical effect.
The third control module 60 is configured to control the outer fan 3 to operate at a preset gear according to the outer tray temperature value, the open outer tray temperature value, and the inner pipe intake temperature value.
Optionally, the third control module 60 is configured to perform step S61 and its sub-steps in the above-described figures to achieve the corresponding technical effect.
The third control module 60 is further configured to perform steps S72, S80-S83 in the above-mentioned figures to achieve the corresponding technical effects.
It should be noted that any two or three of the first receiving module 10, the second receiving module 20 and the third receiving module 30 may be the same module; any two or three of the first control module 40, the second control module 50, and the third control module 60 may be the same module.
In summary, the low-temperature refrigeration control method provided in the embodiment of the present application may indicate that the exhaust temperature of the compressor 2 and the temperature at the bottom of the compressor 2 are low when the outer disc temperature value is less than or equal to the target outer disc temperature value, so that the purpose of reducing the rotation speed of the outer fan 3 may be achieved by reducing the gear of the outer fan 3, and thus the exhaust temperature of the compressor 2 and the temperature at the bottom of the compressor 2 may be increased to ensure the stability of the compressor 2. In addition, under the condition that the outer disc temperature value is greater than the target outer disc temperature value, the temperature of the outer disc is indicated to reach the preset temperature, and under the condition, the purpose of increasing the rotating speed of the outer fan 3 can be achieved in a mode of increasing the gear of the outer fan 3, so that the pressure of the condenser 5 is reduced, and meanwhile, the refrigerating capacity can be improved. In other words, the rotation speed of the outer fan 3 can be maintained at a low speed or stopped state for a long time in this manner to ensure that the discharge temperature and the temperature of the bottom of the compressor 2 are in a high state, thereby improving the operation stability of the compressor 2. And can also promote through the gear of outer fan 3 and lead to the increase of 3 rotational speeds of outer fan under the too big condition of pressure of condenser 5 to realize the reinforcing heat transfer, reduce the pressure of condenser 5 and promote the purpose of refrigerating output. Under the condition that the temperature value of the outer disc is less than or equal to the target temperature value of the outer disc, the exhaust temperature of the compressor 2 and the temperature at the bottom of the compressor 2 are low, so that the purpose of reducing the rotating speed of the outer fan 3 can be achieved by reducing the gear of the outer fan 3, the exhaust temperature of the compressor 2 and the temperature at the bottom of the compressor 2 can be increased, and the stability of the compressor 2 is ensured. In addition, under the condition that the outer disc temperature value is greater than the target outer disc temperature value, the temperature of the outer disc is indicated to reach the preset temperature, and under the condition, the purpose of increasing the rotating speed of the outer fan 3 can be achieved in a mode of increasing the gear of the outer fan 3, so that the pressure of the condenser 5 is reduced, and meanwhile, the refrigerating capacity can be improved. In other words, the rotation speed of the outer fan 3 can be maintained at a low speed or stopped state for a long time in this manner to ensure that the discharge temperature and the temperature of the bottom of the compressor 2 are in a high state, thereby improving the operation stability of the compressor 2. And can also promote through the gear of outer fan 3 and lead to the increase of 3 rotational speeds of outer fan under the too big condition of pressure of condenser 5 to realize the reinforcing heat transfer, reduce the pressure of condenser 5 and promote the purpose of refrigerating output. Also, the defrost mode can be operated under the condition that the temperature of the interior evaporator 6 is low to prevent a system failure, thereby further ensuring the operation stability of the air conditioner 1.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative and, for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions may be stored in a computer-readable storage medium if they are implemented in the form of software functional modules and sold or used as separate products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A low-temperature refrigeration control method is applied to an air conditioner and is characterized by comprising the following steps:
receiving an outer ring temperature value, wherein the outer ring temperature value represents the temperature of the environment where an outer unit of the air conditioner is located;
acquiring gear data of the outer fan according to the outer ring temperature value, and controlling the outer fan to operate according to an initial gear corresponding to the gear data of the outer fan;
acquiring a target outer disc temperature value according to the outer ring temperature value;
receiving an outer disc temperature value, wherein the outer disc temperature value represents a temperature of a coil within the outer machine;
controlling the operating gear of the outer fan to be reduced until the operating gear of the outer fan is reduced to the lowest gear corresponding to the gear data of the outer fan or controlling the operating gear of the outer fan to be increased until the operating gear of the outer fan is increased to the highest gear corresponding to the gear data of the outer fan according to the outer disk temperature value and the target outer disk temperature value;
after the step of controlling the operation of the outer fan according to the initial gear corresponding to the gear data of the outer fan, the low-temperature refrigeration control method further comprises the following steps:
acquiring a starting outer disc temperature value according to the outer ring temperature value, wherein the starting outer disc temperature value represents the temperature of the outer disc when the outer fan is started and operated at the initial gear;
after the gear of the external fan is reduced to the lowest gear, the low-temperature refrigeration control method further comprises the following steps:
receiving an inner pipe air inlet temperature value, wherein the inner pipe air inlet temperature value represents the temperature of a refrigerant at an inlet pipe of an evaporator in an inner unit of the air conditioner;
controlling the outer fan to operate at a preset gear according to the outer disc temperature value, the opening outer disc temperature value and the inner pipe air inlet temperature value;
and after controlling the outer fan to operate at the preset gear, returning to continue executing the step of controlling the operating gear of the outer fan to be reduced according to the outer disk temperature value and the target outer disk temperature value until the operating gear of the outer fan is reduced to the lowest gear corresponding to the gear position data of the outer fan, or controlling the operating gear of the outer fan to be lifted until the operating gear of the outer fan is lifted to the highest gear corresponding to the gear position data of the outer fan.
2. The low-temperature refrigeration control method according to claim 1, wherein the step of controlling the operating gear of the external fan to be lowered until the operating gear of the external fan is lowered to a lowest gear corresponding to the gear of the external fan, or controlling the operating gear of the external fan to be raised until the operating gear of the external fan is raised to a highest gear corresponding to the gear of the external fan according to the external fan temperature value and the target external fan temperature value comprises:
judging whether the outer disk temperature value is larger than the target outer disk temperature value or not;
if the outer disk temperature value is less than or equal to the target outer disk temperature value, controlling the outer fan to lower the gear;
after controlling the outer fan to lower the gear, controlling the outer fan to continuously operate for a first preset time in the gear after the gear is lowered, and then returning to the step of judging whether the outer disc temperature value is greater than the target outer disc temperature value until the gear operated by the outer fan is increased to the highest gear or reduced to the lowest gear;
if the outer disk temperature value is larger than the target outer disk temperature value, controlling the outer fan to lift gears; after the outer fan is controlled to lift the gear, the outer fan is controlled to continuously run for a second preset time in the gear after the gear is lifted, and then the step of judging whether the outer disc temperature value is larger than the target outer disc temperature value is executed again until the gear of the outer fan is lifted to the highest gear or reduced to the lowest gear;
the first preset time is greater than or equal to the second preset time.
3. The low-temperature refrigeration control method according to claim 1, wherein the step of controlling the outer fan to operate at a preset gear according to the outer disc temperature value, the opening outer disc temperature value and the inner pipe air inlet temperature value comprises the steps of:
judging whether the outer disk temperature value is greater than or equal to the starting outer disk temperature value;
if the outer plate temperature value is greater than or equal to the opening outer plate temperature value, judging whether the inner pipe air inlet temperature value is greater than or equal to a first preset temperature value;
and if the air inlet temperature value of the inner pipe is greater than or equal to the first preset temperature value, controlling the outer fan to start and operate at the preset gear.
4. The low-temperature refrigeration control method according to claim 1, further comprising, after the gear of the outside fan is lowered to the lowest gear:
obtaining a duration value, wherein the duration value represents a time that the outer fan is in a lowest gear;
acquiring a preset time value according to the outer ring temperature value, wherein the preset time value represents the longest time for allowing the outer fan to stop;
if the duration value reaches the preset time value, controlling the outer fan to start to operate at a preset gear;
and after controlling the outer fan to operate at the preset gear, returning to continue executing the step of controlling the operating gear of the outer fan to be reduced according to the outer disk temperature value and the target outer disk temperature value until the operating gear of the outer fan is reduced to the lowest gear corresponding to the gear position data of the outer fan, or controlling the operating gear of the outer fan to be lifted until the operating gear of the outer fan is lifted to the highest gear corresponding to the gear position data of the outer fan.
5. The method as claimed in claim 4, wherein the step of obtaining the preset time value according to the outer loop temperature value comprises:
and acquiring the preset time values corresponding to the temperature intervals according to the temperature intervals in which the outer ring temperature values are positioned, wherein the temperature intervals are multiple and continuous, the temperatures corresponding to the multiple temperature intervals are sequentially reduced, and the preset time values corresponding to the multiple temperature intervals with sequentially reduced temperatures are sequentially reduced.
6. The low temperature refrigeration control method according to claim 1, further comprising:
judging whether the air inlet temperature value of the inner pipe is less than or equal to a third preset temperature value or not;
and if the air inlet temperature value of the inner pipe is less than or equal to the third preset temperature value, controlling the compressor of the air conditioner and the outer fan to stop.
7. The low temperature refrigeration control method as set forth in claim 6, wherein after the step of controlling both the compressor of the air conditioner and the outside fan to be stopped, the low temperature refrigeration control method further includes: judging whether the air inlet temperature value of the inner pipe is greater than or equal to a second preset temperature value, wherein the second preset temperature value is greater than a third preset temperature value;
and if the air inlet temperature value of the inner pipe is greater than or equal to the second preset temperature value, returning to the step of continuously executing the step of controlling the operation of the outer fan according to the initial gear corresponding to the gear data of the outer fan.
8. The low-temperature refrigeration control method according to claim 1, wherein before the step of obtaining the outer fan gear data according to the outer ring temperature value, the low-temperature refrigeration control method further comprises:
judging whether the outer ring temperature value is less than or equal to a fourth preset temperature value or not;
and if the outer ring temperature value is less than or equal to the fourth preset temperature value, controlling the air conditioner to enter a low-temperature refrigeration mode.
9. A low-temperature refrigeration control device is applied to an air conditioner and is characterized by comprising:
a first receiving module configured to receive an outer ring temperature value, wherein the outer ring temperature value represents a temperature of an environment in which an external unit of the air conditioner is located;
the first control module is configured to acquire outer fan gear data according to the outer ring temperature value and control the outer fan to operate according to an initial gear corresponding to the outer fan gear data;
the acquisition module is configured to acquire a target outer disc temperature value according to the outer ring temperature value; the external fan control device is further configured to obtain a starting external disk temperature value, wherein the starting external disk temperature value represents the temperature of the external disk when the external fan is started to operate at the initial gear;
a second receiving module configured to receive an outer pan temperature value, wherein the outer pan temperature value represents a temperature of a coil within the outer machine;
the second control module is configured to control the operating gear of the external fan to be lowered until the operating gear of the external fan is lowered to the lowest gear corresponding to the gear data of the external fan or control the operating gear of the external fan to be raised until the operating gear of the external fan is raised to the highest gear corresponding to the gear data of the external fan according to the external disk temperature value and the target external disk temperature value;
the third receiving module is configured to receive an inner pipe air inlet temperature value, wherein the inner pipe air inlet temperature value represents the temperature of a refrigerant at an inlet pipe of an evaporator in an inner unit of the air conditioner;
the third control module is configured to control the outer fan to operate at a preset gear according to the outer disc temperature value, the opening outer disc temperature value and the inner pipe air inlet temperature value; and after controlling the outer fan to operate at the preset gear, returning to continue executing the step of controlling the operating gear of the outer fan to be reduced according to the outer disk temperature value and the target outer disk temperature value until the operating gear of the outer fan is reduced to the lowest gear corresponding to the gear data of the outer fan, or controlling the operating gear of the outer fan to be lifted until the operating gear of the outer fan is lifted to the highest gear corresponding to the gear data of the outer fan.
10. An air conditioner characterized by comprising a controller configured to execute the low temperature refrigeration control method according to any one of claims 1 to 8.
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