CN111536593B - Air conditioner, fresh air duct anti-freezing method thereof and storage medium - Google Patents
Air conditioner, fresh air duct anti-freezing method thereof and storage medium Download PDFInfo
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- CN111536593B CN111536593B CN202010406354.1A CN202010406354A CN111536593B CN 111536593 B CN111536593 B CN 111536593B CN 202010406354 A CN202010406354 A CN 202010406354A CN 111536593 B CN111536593 B CN 111536593B
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0035—Indoor units, e.g. fan coil units characterised by introduction of outside air to the room
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/009—Indoor units, e.g. fan coil units characterised by heating arrangements
- F24F1/0093—Indoor units, e.g. fan coil units characterised by heating arrangements with additional radiant heat-discharging elements, e.g. electric heaters
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
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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
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/02—Ducting arrangements
- F24F13/04—Air-mixing units
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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
- F24F2110/12—Temperature of the outside air
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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
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- Signal Processing (AREA)
- Fluid Mechanics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an anti-freezing method for a fresh air duct of an air conditioner, wherein the air conditioner is provided with the fresh air duct, a fresh air fan, a heating device and a fresh air inlet pipe connected with an air inlet of the fresh air duct, and the fresh air fan is arranged in the fresh air duct; the heating device is arranged in the fresh air inlet pipe, or the heating device is arranged at the air inlet of the fresh air duct; the method for preventing the fresh air duct of the air conditioner from freezing comprises the following steps: after the fresh air fan is started, acquiring the air temperature on the fresh air duct and the indoor dew point temperature; and when the difference value between the indoor dew point temperature and the air temperature is greater than or equal to a first preset threshold value, controlling the heating device to heat. The invention also discloses an air conditioner and a storage medium. The invention can effectively prevent the indoor air from freezing when the indoor air is contacted with the purifying device in the fresh air duct due to the fact that the temperature of fresh air entering the indoor space from the outdoor space is too low, and avoids the purifying effect from being influenced by the freezing of the purifying device.
Description
Technical Field
The invention relates to the technical field of air conditioning, in particular to an air conditioner, an anti-freezing method of a fresh air duct of the air conditioner and a storage medium of the air conditioner.
Background
The air conditioners commonly used in the day before are provided with air conditioners, purifiers and the like, wherein in the process of adjusting the indoor environment, the air conditioners and the purifiers are generally circulated to adjust the indoor environment, the indoor environment is circulated for a long time, and indoor carbon dioxide is easily excessive. However, when the outdoor environment temperature at which the air conditioner is located is too low, too low fresh air enters the fresh air duct, the temperature of the purification device in the fresh air duct is reduced, and because the fresh air inlet pipe and the fresh air duct have an installation gap, indoor air enters the fresh air duct through the installation gap, and is easy to freeze on the purification device when contacting the surface of the purification device, and the purification effect is affected when the surface of the purification device freezes.
Disclosure of Invention
The invention mainly aims to provide an air conditioner, a fresh air duct anti-freezing method and a storage medium thereof, and aims to solve the problems that when the air conditioner runs in a low-temperature environment, the fresh air function is started, the fresh air duct is easy to freeze, and the purification effect of a purification device of the fresh air duct is influenced.
In order to achieve the purpose, the invention provides a method for preventing the fresh air duct of an air conditioner from freezing, wherein the air conditioner is provided with a fresh air duct, a fresh air fan, a heating device and a fresh air inlet pipe connected with an air inlet of the fresh air duct, and the fresh air fan is arranged in the fresh air duct; the heating device is arranged in the fresh air inlet pipe, or the heating device is arranged at the air inlet of the fresh air duct; the method for preventing the fresh air duct of the air conditioner from freezing comprises the following steps:
after the fresh air fan is started, acquiring the air temperature on the fresh air duct and the indoor dew point temperature;
and when the difference value between the indoor dew point temperature and the air temperature is greater than or equal to a first preset threshold value, controlling the heating device to heat.
Optionally, after the step of controlling the heating of the heating device, the method further includes:
after a first preset time interval, acquiring the air temperature and the indoor dew point temperature;
and when the difference value between the indoor dew point temperature and the air temperature is greater than or equal to the first preset threshold value, increasing the heating power of the heating device and/or reducing the rotating speed of the fresh air fan.
Optionally, the step of increasing the heating power of the heating device and/or decreasing the rotation speed of the fresh air fan includes:
when the heating power of the heating device is smaller than the rated power, the heating power of the heating device is increased;
and when the heating of the heating device is greater than the rated power, the rotating speed of the fresh air fan is reduced.
Optionally, before the step of reducing the rotation speed of the fresh air fan, the method further includes:
acquiring the current rotating speed of the fresh air fan;
when the current rotating speed reaches a preset rotating speed, controlling the fresh air fan to stop rotating and/or outputting fault alarm information;
and when the current rotating speed is greater than the preset rotating speed, executing the step of reducing the rotating speed of the fresh air fan.
Optionally, after the step of reducing the rotation speed of the fresh air fan, the method further includes:
after a second preset time interval, acquiring the air temperature and the indoor dew point temperature;
and when the difference value between the indoor dew point temperature and the air temperature is smaller than the first preset threshold value and a third preset time interval is continued, increasing the rotating speed of the fresh air fan.
Optionally, before the step of increasing the rotation speed of the fresh air fan, the method further includes:
acquiring indoor air parameters of an air conditioner;
determining a target fresh air volume according to the indoor air parameters;
determining a target rotating speed of the fresh air fan according to the target fresh air volume;
and increasing the fresh air fan according to the target rotating speed.
Optionally, when the difference between the indoor dew point temperature and the air temperature is greater than or equal to a first preset threshold, the step of controlling the heating device to heat includes:
and when the difference value between the indoor dew point temperature and the air temperature is greater than or equal to a second preset threshold value, controlling a heating device on the fresh air duct to heat according to preset power, wherein the second preset threshold value is greater than the first preset threshold value.
Optionally, an indoor return air inlet is formed in the fresh air inlet pipe, and an air door is arranged at the indoor return air inlet; after the step of controlling the heating of the heating device, the method further comprises:
and controlling the air door to be opened.
The invention also provides an air conditioner, wherein the air conditioner is provided with a fresh air duct, a fresh air fan, a heating device and a fresh air inlet pipe connected with an air inlet of the fresh air duct, the fresh air fan is arranged in the fresh air duct, the heating device is arranged in the fresh air inlet pipe, or the heating device is arranged at the air inlet of the fresh air duct, the air conditioner further comprises a memory, a processor and a fresh air duct anti-freezing control program which is stored in the memory and can run on the processor, the fresh air fan and the heating device are both connected with the processor, and the steps of the air conditioner fresh air duct anti-freezing method are realized when the fresh air duct anti-freezing control program is executed by the processor.
In addition, the invention also provides a storage medium, wherein the computer readable storage medium stores a fresh air duct anti-freezing control program, and the fresh air duct anti-freezing control program realizes the steps of the fresh air duct anti-freezing method for the air conditioner when being executed by the processor.
According to the air conditioner and the anti-freezing method and the storage medium for the fresh air duct of the air conditioner, the heating device is arranged in the fresh air duct of the air conditioner or in the fresh air inlet pipe connected with the air inlet of the fresh air duct, if the air conditioner operates in a low-temperature environment and the fresh air function is started, if the difference between the indoor dew point temperature and the outdoor air temperature is larger than or equal to the preset threshold value, the heating device is started to heat the air temperature entering the fresh air inlet, so that the difference between the indoor dew point temperature and the air temperature entering the fresh air duct is smaller than the preset threshold value, the temperature of the purification device of the fresh air duct is prevented from being reduced when the outdoor fresh air temperature is too low, the indoor air is prevented from freezing on the purification device when contacting with the purification device, and the purification effect of the purification device is prevented from being influenced.
Drawings
FIG. 1 is a schematic diagram of a hardware architecture of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an air conditioner to which the method for preventing freezing of a fresh air duct of the air conditioner is applied;
FIG. 3 is a schematic view of the internal structure of part A in FIG. 2;
FIG. 4 is a schematic flow chart illustrating a method for preventing freezing of a fresh air duct of an air conditioner according to a first embodiment of the present invention;
FIG. 5 is a schematic flow chart illustrating a method for preventing freezing of a fresh air duct of an air conditioner according to a second embodiment of the present invention;
FIG. 6 is a schematic flow chart illustrating a method for preventing freezing of a fresh air duct of an air conditioner according to a third embodiment of the present invention;
FIG. 7 is a schematic flow chart illustrating a method for preventing freezing in a fresh air duct of an air conditioner according to a fourth embodiment of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 1 | |
11 | |
| 12 | |
13 | |
| 14 | Fresh |
15 | |
| 16 | |
17 | |
| 18 | Indoor |
19 | Air door |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The main solution of the embodiment of the invention is as follows: the air conditioner is provided with a fresh air duct, a fresh air fan, a heating device and a fresh air inlet pipe connected with an air inlet of the fresh air duct, and the fresh air fan is arranged in the fresh air duct; the heating device is arranged in the fresh air inlet pipe, or the heating device is arranged at the air inlet of the fresh air duct; the method for preventing the fresh air duct of the air conditioner from freezing comprises the following steps:
after the fresh air fan is started, acquiring the air temperature in the fresh air duct;
and when the difference value between the indoor dew point temperature and the air temperature is greater than or equal to a first preset threshold value, controlling the heating device to heat.
As an implementation manner, a hardware environment architecture related to the method for preventing freezing of the fresh air duct of the air conditioner may be as shown in fig. 1.
The air conditioner related to the scheme of the embodiment of the invention has the functions of refrigeration and heating, and the air conditioner runs the refrigeration function in the environment with higher temperature and runs the heating function in the environment with lower temperature.
Specifically, the air conditioner includes: a processor 101, e.g. a CPU, a memory 102, a communication bus 103. Wherein a communication bus 103 is used for enabling the connection communication between these components. The processor 102 is used for calling an application program to perform functions such as cooling and heating.
The memory 102 may be a high-speed RAM memory or a non-volatile memory (e.g., a disk memory).
The air conditioner related to the embodiment of the invention also has a fresh air function, and specifically, referring to fig. 2, the air conditioner 1 is provided with a fresh air duct 12, a fresh air fan 13 and a fresh air inlet pipe 14 connected with an air inlet of the fresh air duct 12. Particularly, new trend wind channel 12 sets up in the casing 11 of air conditioner 1, new trend fan 13 sets up in the new trend wind channel 12, new trend air-supply line 14 sets up on the air conditioner 1, for example new trend air-supply line 14 one end with the air intake connection in new trend wind channel 12, the other end is used for extending to outdoors, when new trend fan 13 was opened, through new trend air-supply line 14 introduces outdoor new trend wind channel 12, and then the entering is indoor to the realization is to indoor new trend function of introducing.
It should be noted that, a purification device 15 is further disposed in the fresh air duct 12 of the air conditioner 1, and the purification device 15 is used for purifying fresh air entering from the outdoor, so as to prevent the quality of the indoor environment from being affected by the outdoor fresh air. The purification device 15 includes, but is not limited to, an anion purification component, a disinfection and sterilization component, a filter screen, etc.
It can be understood that, based on the fact that the air conditioner 1 according to the embodiment of the present invention can be applied to the area with the relatively low environmental temperature, in order to prevent the surface temperature of the purifying device 15 in the fresh air duct 12 from being reduced by the low temperature air after the relatively low temperature air enters the fresh air duct 12, because the installation gap exists between the fresh air inlet pipe 14 and the fresh air duct 12, if the indoor air enters the fresh air duct 12 from the installation gap and contacts with the purifying device 15 with the relatively low surface temperature, the surface of the purifying device 15 is frozen, which affects the purifying effect of the purifying device 15, the air conditioner 1 according to the embodiment of the present invention further includes a heating device 17 for heating the temperature of the air entering the fresh air duct, and the heating device 17 is disposed in the fresh air inlet pipe 14, or the heating device 17 is disposed at the air inlet of the fresh air duct 12.
For example, when the heating device 17 is disposed in the fresh air inlet duct 14, when fresh air enters from the air inlet of the fresh air inlet duct 14, the heated fresh air is sent to the fresh air duct 12 after being heated at the fresh air inlet duct 14, and the temperature of the air entering the fresh air duct 12 is relatively high, so that the purification device 15 in the fresh air duct 12 is not easy to freeze. Similarly, when the heating device 17 is disposed at the air inlet of the fresh air duct 12, the fresh air entering from the fresh air inlet pipe 14 is heated at the air inlet of the fresh air duct 12 and then enters the fresh air duct 12, and the air temperature is heated so that the purifying device 15 in the fresh air duct 12 is not easy to freeze. In the preferred embodiment, the heating device 17 is disposed at the fresh air inlet duct 14, so that air can be sufficiently heated in the fresh air inlet duct 14, and the freezing prevention effect is improved. Wherein, the heating device may be PCT (Positive Temperature Coefficient, heating plate, thermistor). Or further, because the fresh air inlet pipe 14 is partially exposed to the outside and partially exposed to the inside, when fresh air with lower temperature enters the fresh air inlet pipe 14, the temperature of the fresh air inlet pipe 14 can be reduced, and when indoor air contacts with the surface of the fresh air inlet pipe 14, the fresh air inlet pipe 14 is easily frozen on the surface of the fresh air inlet pipe 14, so as to prevent the surface of the fresh air inlet pipe 14 from being frozen, the heating device 15 is arranged on the side of the fresh air inlet pipe 14 close to the outside, so that the outdoor air is heated after entering from the outdoor air inlet, and the air entering the indoor side of the fresh air inlet pipe 14 is the heated fresh air, so that the pipe temperature of the indoor side of the fresh air inlet pipe 14 is increased, and the surface of the fresh air inlet pipe 14 is prevented from being frozen; or heating device 15 is the embedding the heater strip of the inner wall of new trend air-supply line 14 heats through the heater strip new trend air-supply line 14 for the pipe temperature of new trend air-supply line 14 risees, avoids the surface of new trend air-supply line 14 to freeze, and has the heat to discharge in the new trend air-supply line 14 during the heater strip heating, with the new trend heat transfer in the new trend air-supply line 14, the temperature of the new trend that risees outdoor entering makes the new trend temperature that flows into new trend wind channel 12 higher, still can prevent simultaneously that purifier 15 in the new trend wind channel 12 from freezing. Or, in order to further improve the heat exchange effect of the fresh air, the outer surface of the fresh air inlet pipe 14 can be provided with heat insulation cotton, so that the heating wires only radiate heat into the fresh air inlet pipe 14, the heat in the fresh air inlet pipe 14 is increased, and the heat exchange effect of the fresh air is improved.
Further, this embodiment is in the air outlet of new trend wind channel 12 or be close to air outlet one side and set up temperature sensor 15, adopt temperature sensor 15 gathers the air temperature in new trend wind channel 12, before heating device 17 did not open, the air temperature in new trend wind channel 12 is the same with outdoor ambient temperature, and after heating device 17 opened, the air temperature in new trend wind channel 12 was the air temperature after the heating, if this moment the air temperature is higher, and is less with indoor dew point temperature difference, then can be according to demand control heating device 17 stop operation to reduce the consumption.
In a further embodiment, referring to fig. 3, the fresh air inlet duct 14 of the air conditioner of this embodiment is provided with an indoor return air inlet 18, the indoor air return opening 18 is provided with an air door 19, the air door 19 comprises a driver (not labeled in the figure), the driver is connected with the processor 101, the processor 101 controls the driver to drive the damper 19 to move, so as to open or close the indoor air return opening 18, an indoor air return opening 18 is arranged on a fresh air inlet pipe 14 of the air conditioner 1, an air door 19 is arranged at the indoor air return opening 18, indoor air can be introduced into the fresh air inlet duct 14, and when the air conditioner 1 is heated in a low-temperature environment, the indoor air temperature is far higher than the outdoor air temperature, and at the moment, the indoor air is guided into the fresh air inlet pipe 14 through the indoor air return opening 18, so that the temperature in the fresh air duct can be increased, and the anti-freezing effect is further achieved. Wherein, this embodiment sets up and sets up indoor return air inlet 18 on new trend air-supply line 14, can make indoor return air flow to new trend wind channel 12 again after fully contacting with outdoor new trend in new trend air-supply line 14, when preventing that indoor return air from directly flowing to new trend wind channel 12, still do not have sufficient heat transfer promptly and with the purifier 15 contact in the new trend wind channel 12 for freeze the speed.
Based on the air conditioner, when the air conditioner operates to heat and starts a fresh air function, the processor 101 of the air conditioner calls a fresh air duct anti-freezing control program from the memory 102, and then executes a fresh air duct anti-freezing process.
It can be understood that the execution program of the method for preventing freezing of the fresh air duct of the air conditioner in the embodiment may be stored in a storage medium as an independent program; the processor 101 of the air conditioner may be configured to call the fresh air duct anti-freezing control program stored in the memory 102, and perform the following operations:
after the fresh air fan is started, acquiring the air temperature and the indoor dew point temperature in the fresh air duct;
and when the difference value between the indoor dew point temperature and the air temperature is greater than or equal to a first preset threshold value, controlling the heating device to heat.
In an embodiment, the processor 101 may be configured to call a fresh air duct anti-freezing control program stored in the memory 102, and perform the following operations:
after a first preset time interval, acquiring the air temperature and the indoor dew point temperature;
and when the difference value between the indoor dew point temperature and the air temperature is greater than or equal to the first preset threshold value, increasing the heating power of the heating device and/or reducing the rotating speed of the fresh air fan.
In an embodiment, the processor 101 may be configured to call a fresh air duct anti-freezing control program stored in the memory 102, and perform the following operations:
when the heating power of the heating device is smaller than the rated power, the heating power of the heating device is increased;
and when the heating of the heating device is greater than the rated power, the rotating speed of the fresh air fan is reduced.
In an embodiment, the processor 101 may be configured to call a fresh air duct anti-freezing control program stored in the memory 102, and perform the following operations:
acquiring the current rotating speed of the fresh air fan;
when the current rotating speed reaches a preset rotating speed, controlling the fresh air fan to stop rotating and/or outputting fault alarm information;
and when the current rotating speed is greater than the preset rotating speed, executing the step of reducing the rotating speed of the fresh air fan.
In an embodiment, the processor 101 may be configured to call a fresh air duct anti-freezing control program stored in the memory 102, and perform the following operations:
after a second preset time interval, acquiring the air temperature and the indoor dew point temperature;
and when the difference value between the indoor dew point temperature and the air temperature is smaller than the first preset threshold value and a third preset time interval is continued, increasing the rotating speed of the fresh air fan.
In an embodiment, the processor 101 may be configured to call a fresh air duct anti-freezing control program stored in the memory 102, and perform the following operations:
acquiring indoor air parameters of an air conditioner;
determining a target fresh air volume according to the indoor air parameters;
determining a target rotating speed of the fresh air fan according to the target fresh air volume;
and increasing the fresh air fan according to the target rotating speed.
In an embodiment, the processor 101 may be configured to call a fresh air duct anti-freezing control program stored in the memory 102, and perform the following operations:
and when the difference value between the indoor dew point temperature and the air temperature is greater than or equal to a second preset threshold value, controlling a heating device on the fresh air duct to heat according to preset power, wherein the second preset threshold value is greater than the first preset threshold value.
In an embodiment, the processor 101 may be configured to call a fresh air duct anti-freezing control program stored in the memory 102, and perform the following operations:
and controlling the air door to be opened.
Based on the hardware framework of the air conditioner, the invention provides various embodiments of the anti-freezing method for the fresh air duct of the air conditioner.
Referring to fig. 4, fig. 4 is a first embodiment of a method for preventing freezing of a fresh air duct of an air conditioner, in which the air conditioner is provided with a fresh air duct, a fresh air blower, a heating device and a fresh air inlet pipe connected to an air inlet of the fresh air duct, and the fresh air blower is disposed in the fresh air duct; the heating device is arranged in the fresh air inlet pipe, or the heating device is arranged at the air inlet of the fresh air duct; the method for preventing the fresh air duct of the air conditioner from freezing comprises the following steps:
step S10, after the fresh air fan is started, acquiring the air temperature in the fresh air duct and the indoor dew point temperature;
and step S20, controlling the heating device to heat when the difference between the indoor dew point temperature and the air temperature is greater than or equal to a first preset threshold value.
In this embodiment, the execution main body is an air conditioner, or may be a control terminal of the air conditioner, such as a server or a central controller, and the control terminal is connected to the air conditioner wirelessly or by wire, so as to control the air conditioner to execute corresponding operations.
The present embodiment is described by taking an example in which the air conditioner operates in a low temperature environment, such as a heating mode. After the air conditioner starts a heating mode, detecting indoor air parameters in real time or at regular time, wherein the indoor air parameters comprise but are not limited to carbon dioxide concentration; when the indoor air parameter is larger than the preset threshold value, the indoor carbon dioxide concentration is over-high, and in order to keep the body of a user healthy, the fresh air fan is started to introduce fresh air from the outdoor to the indoor.
After the fresh air fan is started, the purification device in the fresh air duct is easy to freeze when the outdoor air temperature is too low, and then the purification effect of the purification device in the fresh air duct is influenced. Consequently this application sets up the anti-icing mode in new trend wind channel for when the air conditioner satisfies the condition of freezing, start the anti-icing mode, prevent that the new trend wind channel of air conditioner from freezing.
Specifically, a temperature sensor is arranged in the fresh air duct, the air temperature on the fresh air duct is acquired in real time or at regular time, and an indoor temperature sensor and an indoor humidity sensor are also arranged indoors to acquire the indoor temperature and the indoor humidity respectively; further obtaining an indoor dew point temperature according to the indoor temperature and the indoor humidity; setting the icing judgment condition of the fresh air duct of the air conditioner: indoor dew point temperature with when the difference of air temperature is greater than or equal to first predetermined threshold value, then explain that indoor dew point temperature is higher than outdoor air temperature, the purifier surface of indoor air easy in new trend wind channel or the surface of new trend intake stack freeze, at this moment, control heating device heats to make reentrant after the new trend heating of outdoor entering new trend wind channel improves the air temperature who gets into new trend wind channel, so, reduces the difference in temperature of air temperature degree and indoor dew point temperature in the new trend wind channel, and new trend wind channel is difficult for freezing for the air conditioner is suitable for and uses new trend function under the low temperature environment, improves the suitability of air conditioner.
It can be understood that the heating device in this embodiment is a variable power heating device, and the heating device may be set to be turned on at a fixed power each time the heating device is turned on; or the heating device can be set to be turned on according to the power of the previous turn-off when the coal is started every time; or, when the outdoor environment temperature is very low, for example, 10 to 20 ℃ below zero, the freezing speed is very fast, and in order to prevent the air from quickly freezing after entering the fresh air duct, the heating device may be set to select the corresponding heating power to heat according to the difference between the indoor dew point temperature and the air temperature, and especially, when the difference between the indoor dew point temperature and the air temperature is greater than or equal to a second preset threshold, the heating device on the fresh air duct is controlled to heat according to the preset power, where the second preset threshold is greater than the first preset threshold, and the preset power may be the rated power, that is, the heating device is directly started at the maximum power to heat the air temperature at the fastest speed. The preset power can also be the power corresponding to the temperature range in which the difference between the indoor dew point temperature and the air temperature is located; for example, a plurality of temperature difference ranges are set, each temperature difference range is correspondingly provided with a power (preset power), and after the temperature difference range in which the difference between the indoor dew point temperature and the air temperature is located is determined, the preset power is determined according to the temperature difference range.
It can be understood that, in this embodiment, the first preset threshold may be a temperature difference range, for example, between-5 ℃ and 0 ℃, and when the difference between the indoor dew point temperature and the air temperature is lower than the temperature difference range, the air is very easy to freeze, so that before the difference between the indoor dew point temperature and the air temperature is not lower than the temperature difference range, the air is heated in advance, and the control of preventing freezing of the fresh air duct is implemented.
It should be noted that, in this embodiment, the heating device is preferably disposed at an air inlet of the fresh air inlet duct, which is close to the fresh air inlet duct. Because the air temperature in the new trend air inlet pipe is when low, also can reduce the surface temperature of new trend air inlet pipe, when being located indoor new trend air inlet pipe and indoor air contact, the surface of new trend air inlet pipe also can freeze. Consequently the new trend air intake pipe is close to new trend air intake pipe's air inlet department sets up heating device can be to the outdoor wind heating of the air intake that gets into new trend air intake pipe, and the new trend that flows to new trend air intake pipe is the new trend after the heating, has reduced new trend air intake pipe's temperature, can avoid simultaneously that new trend air intake pipe and new trend wind channel in purifier freeze, simple structure, and purifying effect is better.
Or, in other embodiments, the heating device may be a heating wire embedded in the inner wall of the fresh air intake duct, and the heating wire is connected to the controller, and the heating is controlled by the controller. The heater strip sets up in the inner wall of new trend air-supply line, it is direct right new trend air-supply line heats, improves new trend air-supply line's surface temperature, avoids freezing.
In this embodiment, through in the new trend wind channel of air conditioner, perhaps with set up heating device in the new trend air-supply line of the air intake connection in new trend wind channel, if the air conditioner moves under low temperature environment, and when opening the new trend function, if and the difference of indoor dew point temperature and outdoor air temperature is greater than or equal to and predetermines the threshold value, through opening heating device heats the entering the air temperature in new trend wind channel for the difference of indoor dew point temperature and the air temperature that gets into the new trend wind channel is less than predetermine the threshold value, prevents that the new trend temperature of outdoor entering from reducing the purifier in new trend wind channel when crossing low temperature, freezes on purifier when avoiding indoor air and purifier to contact, avoids influencing purifier's purifying effect.
Referring to fig. 5, fig. 5 is a second embodiment of the method for preventing freezing of the fresh air duct of the air conditioner based on the first embodiment, and after the step of controlling the heating of the heating device, the method further includes:
step S30, after a first preset time interval, acquiring the air temperature and the indoor dew point temperature;
and step S40, when the difference between the indoor dew point temperature and the air temperature is greater than or equal to the first preset threshold value, increasing the heating power of the heating device and/or reducing the rotating speed of the fresh air fan.
The air conditioner controls the heating device to heat for a first preset time interval, then detects the air temperature and the indoor dew point temperature of the fresh air duct, judges whether the difference between the indoor dew point temperature and the air temperature is still larger than or equal to a first preset threshold value, and if yes, the heating power of the heating device is increased or the rotating speed of the fresh air fan is reduced, or the heating power of the heating device is increased and the rotating speed of the fresh air fan is reduced simultaneously. Wherein, the heating power of the heating device is increased, and the heating temperature can be increased; reduce the rotational speed of new trend fan can reduce the new trend intake to and reduce new trend air inlet speed, the new trend intake is few, and speed is slow, can be so that air and heating device fully contact, and increase to contact for a long time, improve heating temperature.
Based on the heating device in this embodiment is a variable power heating device, after the heating device heats air with the current heating power, the air temperature still cannot avoid the fresh air duct from being frozen, which indicates that the current air temperature is very low, and the air temperature needs to be further increased.
In this embodiment, when the difference between the indoor dew point temperature and the air temperature is greater than or equal to the first preset threshold, the heating power of the heating device is selectively increased, or the rotation speed of the fresh air fan is selectively decreased, which may be different according to different current operating environments of the air conditioner.
For example, if the current heating power of the heating device is less than the rated power, that is, the heating device does not reach the maximum heating power, the heating power may be preferentially increased to increase the air temperature; and if the current heating power reaches the maximum heating power, the rotating speed of the fresh air fan can be reduced. The power of the heating device is preferentially increased, so that the air inlet volume of the indoor fresh air can be ensured, and a better anti-freezing effect is achieved; when the rotating speed of the fresh air fan is reduced, the fresh air inlet volume and the fresh air inlet speed are reduced, so that the heating device heats a small amount of fresh air, the temperature of the fresh air can be quickly increased, and after the fresh air inlet speed is reduced, the air can be more fully contacted with the heating device, and the temperature of the fresh air is increased.
Or, the rotating speed of the fresh air fan is determined to be reduced or the heating power of the heating device is determined to be increased according to the indoor air parameter. For example, when the indoor air parameter where the air conditioner is located is less than or equal to the preset threshold, it indicates that the indoor carbon dioxide concentration is low, and at this time, the fresh air volume is low and will not affect the indoor environment, and in order to reduce the power consumption of the heating device, the rotation speed of the fresh air fan can be reduced, the fresh air intake volume is reduced, and further, the fresh air temperature is increased.
Further, if the air conditioner controls the rotation speed of the fresh air fan to be reduced, whether the current rotation speed of the fresh air fan is a low rotation speed needs to be determined, and when the current rotation speed of the fresh air fan is prevented from being reduced continuously, the fresh air volume is smaller than a certain value, and the effect of updating the indoor air cannot be achieved, so that the air conditioner performs the following steps before the rotation speed of the fresh air fan is reduced:
acquiring the current rotating speed of the fresh air fan;
when the current rotating speed reaches a preset rotating speed, controlling the fresh air fan to stop rotating and/or outputting fault alarm information;
and when the current rotating speed is greater than the preset rotating speed, executing the step of reducing the rotating speed of the fresh air fan.
The preset rotating speed can be the minimum rotating speed allowed when the set fresh air function is started; the rotating speed corresponding to the minimum windshield of the fresh air fan can also be set. When the current rotating speed of the fresh air fan reaches the preset rotating speed, the fresh air fan cannot be reduced any more, if the heating device reaches the rated power at the moment and the difference value between the indoor dew point temperature and the air temperature is still smaller than or equal to the first preset threshold value, the fresh air function is not suitable to be operated at the moment, the fresh air fan is directly controlled to stop rotating, or fault alarm information is output, and a user is prompted that the fresh air function is not suitable to be started under the current environment.
In this embodiment, the temperature of the fresh air duct is monitored in real time, and if the temperature does not meet the requirement of the anti-freezing temperature, the heating temperature is increased by increasing the heating power of the heating device or reducing the rotation speed of the fresh air fan, so as to meet the requirement of the anti-freezing. And one mode is determined and selected to increase the air temperature according to the heating device or the indoor condition, and the flexibility of the air conditioner control is improved through multiple heating modes.
Referring to fig. 6, fig. 6 is a third embodiment of a method for preventing freezing of a fresh air duct of an air conditioner based on the second embodiment, where after the step of reducing the rotation speed of the fresh air fan, the method further includes:
step S50, after a second preset time interval, acquiring the air temperature and the indoor dew point temperature;
and step S60, when the difference between the indoor dew point temperature and the air temperature is smaller than the first preset threshold value and a third preset time interval is continued, increasing the rotating speed of the fresh air fan.
This embodiment is based on reducing behind the rotational speed of new trend fan, to the control of new trend fan, if reduce after the rotational speed of new trend fan, and after the second of continuous operation predetermines the time interval, detect indoor dew point temperature with air temperature's difference is less than during the first predetermined threshold value, also promptly air temperature in the new trend wind channel and the difference between the indoor dew point temperature are less, and when the air in the new trend wind channel acted on purifier this moment, indoor air also can not produce the frost with purifier's surface contact, has played the anti-icing effect. And after the air conditioner continuously operates for a third preset time interval according to the current operation parameters, increasing the rotating speed of the fresh air fan so as to recover the indoor fresh air inlet volume. Wherein, increasing the rotation speed of the fresh air fan can be directly restoring to the rotation speed before reducing the rotation speed of the fresh air fan; the rotating speed of the fresh air fan can be increased, and the increment of the fresh air fan can be determined according to the indoor current environment requirement, so that indoor air parameters can be quickly recovered, and the customer requirement is met.
Specifically, before the step of increasing the rotation speed of the fresh air fan, the method further comprises:
acquiring indoor air parameters of an air conditioner;
determining a target fresh air volume according to the indoor air parameters;
determining a target rotating speed of the fresh air fan according to the target fresh air volume;
and increasing the fresh air fan according to the target rotating speed.
The indoor air parameter includes, but is not limited to, carbon dioxide concentration. When the difference value between the indoor dew point temperature and the air temperature in the fresh air duct is smaller than the first preset threshold value and lasts for a third preset time interval, whether the indoor carbon dioxide concentration is larger than the preset threshold value or not is judged, if yes, the fresh air volume (target fresh air volume) needing to be introduced is calculated according to the carbon dioxide concentration, the target rotating speed of the fresh air fan is calculated according to the target fresh air volume, and then the fresh air fan is increased according to the target rotating speed, so that the target fresh air volume is introduced indoors.
Specifically, the target fresh air volume is calculated according to the indoor air parameters and the indoor size, and then the target rotating speed is determined according to the target fresh air volume and the operating time, so that the rotating speed of the fresh air fan is increased.
In this embodiment, when the difference between the indoor dew point temperature and the air temperature is smaller than the first preset threshold value and lasts for the third preset time interval, the rotating speed of the fresh air fan is adjusted in time according to the indoor demand, and the fresh air in the indoor environment is kept while the fresh air is prevented from freezing.
Referring to fig. 7, fig. 7 is a fourth embodiment of a method for preventing a fresh air duct of an air conditioner from freezing, which is provided based on the above embodiments, in the embodiment, an indoor return air inlet is arranged on a fresh air inlet pipe of the air conditioner, and an air door is arranged at the indoor return air inlet; after the step of controlling the heating of the heating device, the method further comprises:
and step S70, controlling the air door to be opened.
Or after a first preset time interval, acquiring the air temperature and the indoor dew point temperature;
and when the difference value between the indoor dew point temperature and the air temperature is greater than or equal to the first preset threshold value, controlling the air door to be opened.
In this embodiment, based on the further embodiments provided by the above embodiments, in this embodiment, an indoor air return opening is arranged on the fresh air inlet pipe or the fresh air duct for guiding indoor air back into the fresh air duct, and an air door is arranged on the indoor air return opening and controls the indoor air return opening or closing.
The embodiment is applied to the heating process of the air conditioner, when the air conditioner runs and heats in a low-temperature environment, the indoor temperature is far higher than the outdoor temperature, if the air conditioner starts a fresh air function, outdoor air enters the fresh air duct from the fresh air inlet pipe, in order to prevent the icing condition of the fresh air in the fresh air duct, an indoor air return port can be arranged in the fresh air inlet pipe, the opening or closing of the air door is used for controlling the opening or closing of the indoor air return port, when the indoor air return port is opened, the indoor air is led into the fresh air inlet pipe from the indoor, the fresh air is mixed with the outdoor fresh air in the fresh air inlet pipe, the temperature of the outdoor fresh air is increased, when the outdoor fresh air with the increased temperature flows to the fresh air duct, the surface temperature of a purifying device in the fresh air duct is increased, and at the moment, the indoor air entering from the installation gap between the fresh air inlet pipe and the fresh air duct is not frozen when contacting with the purifying device, the anti-freezing function is realized.
In this embodiment, the air conditioner may perform the controlling of the damper to be opened while performing the controlling of the heating by the heating device. Or, after the step of controlling the heating device to heat, after a first preset time interval, when the difference between the indoor dew point temperature and the air temperature is still less than or equal to the first preset threshold, the air conditioner may also control the air door to open, so as to mix and heat the outdoor fresh air entering from the outdoor space with the air with the higher indoor temperature.
According to the embodiment, the indoor high-temperature air is introduced into the fresh air duct from the indoor side to heat the fresh air introduced from the outdoor side, so that the temperature of the air entering the fresh air duct is higher than the freezing critical temperature, and the anti-freezing effect is improved.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A method for preventing freezing of a fresh air duct of an air conditioner is characterized in that the air conditioner is provided with the fresh air duct, a fresh air fan, a heating device and a fresh air inlet pipe connected with an air inlet of the fresh air duct, and the fresh air fan is arranged in the fresh air duct; the heating device is arranged in the fresh air inlet pipe, or the heating device is arranged at the air inlet of the fresh air duct; the method for preventing the fresh air duct of the air conditioner from freezing comprises the following steps:
after the fresh air fan is started, acquiring the air temperature and the indoor dew point temperature in the fresh air duct;
when the difference value between the indoor dew point temperature and the air temperature is greater than or equal to a first preset threshold value, controlling the heating device to heat;
after a first preset time interval, acquiring the air temperature and the indoor dew point temperature;
when the difference value between the indoor dew point temperature and the air temperature is greater than or equal to the first preset threshold value, acquiring an indoor air parameter, wherein the air parameter comprises carbon dioxide;
when the indoor air parameter is less than or equal to a preset threshold value, reducing the rotating speed of the fresh air fan;
and when the air parameter is larger than the preset threshold value, increasing the heating power of the heating device.
2. The method for preventing freezing of a fresh air duct of an air conditioner as claimed in claim 1, wherein before the step of reducing the rotation speed of the fresh air blower, the method further comprises:
acquiring the current rotating speed of the fresh air fan;
when the current rotating speed reaches a preset rotating speed, controlling the fresh air fan to stop rotating and/or outputting fault alarm information;
and when the current rotating speed is greater than the preset rotating speed, executing the step of reducing the rotating speed of the fresh air fan.
3. The method for preventing freezing of a fresh air duct of an air conditioner as claimed in claim 2, wherein after the step of reducing the rotation speed of the fresh air blower, the method further comprises:
after a second preset time interval, acquiring the air temperature and the indoor dew point temperature;
and when the difference value between the indoor dew point temperature and the air temperature is smaller than the first preset threshold value and lasts for a third preset time interval, increasing the rotating speed of the fresh air fan.
4. The method for preventing freezing of a fresh air duct of an air conditioner as claimed in claim 3, wherein before the step of increasing the rotation speed of the fresh air blower, the method further comprises:
acquiring indoor air parameters of an air conditioner;
determining a target fresh air volume according to the indoor air parameters;
determining a target rotating speed of the fresh air fan according to the target fresh air volume;
and increasing the fresh air fan according to the target rotating speed.
5. The method for preventing freezing of a fresh air duct of an air conditioner as claimed in claim 1, wherein the step of controlling the heating device to heat when the difference between the indoor dew point temperature and the air temperature is greater than or equal to a first preset threshold value comprises:
and when the difference value between the indoor dew point temperature and the air temperature is greater than or equal to a second preset threshold value, controlling a heating device on the fresh air duct to heat according to preset power, wherein the second preset threshold value is greater than the first preset threshold value.
6. The method as claimed in claim 1, wherein the fresh air duct of the air conditioner is provided with an indoor return air inlet, and the indoor return air inlet is provided with an air door; after the step of controlling the heating of the heating device, the method further comprises:
and controlling the air door to be opened.
7. An air conditioner is characterized in that a fresh air duct, a fresh air fan, a heating device and a fresh air inlet pipe connected with an air inlet of the fresh air duct are arranged on the air conditioner, the fresh air fan is arranged in the fresh air duct, the heating device is arranged in the fresh air inlet pipe, or the heating device is arranged at the air inlet of the fresh air duct, the air conditioner further comprises a memory, a processor and a fresh air duct anti-freezing control program which is stored in the memory and can run on the processor, the fresh air fan and the heating device are both connected with the processor, and when being executed by the processor, the fresh air duct anti-freezing control program realizes the steps of the air conditioner fresh air duct anti-freezing method according to any one of claims 1-6.
8. A storage medium, characterized in that the storage medium stores a fresh air duct anti-freezing control program, and the fresh air duct anti-freezing control program, when executed by a processor, implements the steps of the air conditioner fresh air duct anti-freezing method according to any one of claims 1 to 6.
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| WO2022062131A1 (en) * | 2020-09-22 | 2022-03-31 | 广东美的制冷设备有限公司 | Air conditioner |
| CN114811891B (en) * | 2022-03-17 | 2023-12-15 | 青岛海尔空调器有限总公司 | Method and device for preventing condensation of fresh air pipe of air conditioner and air conditioner |
| CN114838494B (en) * | 2022-03-30 | 2024-03-19 | 青岛海尔空调器有限总公司 | Method and device for preventing condensation of air conditioner, air conditioner and storage medium |
| CN114963491A (en) * | 2022-04-12 | 2022-08-30 | 青岛海尔空调器有限总公司 | Method and device for preventing condensation of air conditioner, air conditioner and storage medium |
| CN116007132A (en) * | 2022-12-14 | 2023-04-25 | 珠海格力电器股份有限公司 | Dehumidification defrosting control method and device, fresh air conditioning system and unit |
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