CN111156666B - Fresh air control method and fresh air conditioner - Google Patents

Fresh air control method and fresh air conditioner Download PDF

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Publication number
CN111156666B
CN111156666B CN201911355490.6A CN201911355490A CN111156666B CN 111156666 B CN111156666 B CN 111156666B CN 201911355490 A CN201911355490 A CN 201911355490A CN 111156666 B CN111156666 B CN 111156666B
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air
outlet
temperature
mixed
fresh air
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CN111156666A (en
Inventor
熊重重
陈锐东
廖永富
刘雷明
冯青龙
王高敏
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F24F11/67—Switching between heating and cooling modes
    • 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
    • F24F11/70—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • 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 relates to a fresh air control method, in a cooling mode or a heating mode, the frequency of a compressor and the rotating speed of an indoor motor are respectively adjusted to a set frequency and a set rotating speed, a fresh air fan is started to extract fresh air, and the fresh air and cold air or hot air form mixed air outlet to be conveyed indoors; after the mixed air is blown out, the frequency of the compressor, the running rotating speed of the indoor motor and the extraction amount of the fresh air fan are adjusted and controlled by detecting the air outlet temperature of the mixed air to obtain comfortable indoor natural air. The fresh air control method provided by the invention can enable the outlet air temperature to meet the requirement, avoid the outlet air temperature from fluctuating greatly, obtain comfortable indoor natural air and enable users to obtain more comfortable experience.

Description

Fresh air control method and fresh air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a fresh air control method and a fresh air conditioner.
Background
Along with the improvement of the living standard of people, the fresh air conditioner is deeply loved by users. The fresh air conditioner is an air conditioner integrated with a fresh air system, and can introduce refrigeration or heating fresh air into a room through a fresh air channel when heating or refrigerating, and discharge indoor air to the outside through an exhaust channel to improve indoor air quality. But current fresh air conditioner opens the new trend function, and when carrying the new trend indoor, the air-out temperature that can make fresh air conditioner appears on the high side or the low side phenomenon, and is undulant great, leads to the comfortable effect variation of natural wind to influence user's travelling comfort and experience.
Disclosure of Invention
The invention aims to overcome the problems in the prior art, provides a fresh air control method for avoiding large fluctuation of outlet air temperature, and also provides a fresh air conditioner for realizing the fresh air control method.
In order to achieve the purpose, the invention adopts the following scheme:
a fresh air control method comprises the steps that in a cooling mode or a heating mode, the frequency of a compressor and the rotating speed of an indoor motor are respectively adjusted to be set, a fresh air fan is started, fresh air is extracted, and mixed air outlet is formed by the fresh air and cold air or hot air and is conveyed indoors; after the mixed air is blown out, the frequency of the compressor, the running rotating speed of the indoor motor and the extraction amount of the fresh air fan are adjusted and controlled by detecting the air outlet temperature of the mixed air to obtain comfortable indoor natural air.
Further, adjust compressor frequency and indoor side motor speed respectively to the frequency and the rotational speed of setting for, new fan opens, extracts the new trend, forms mixed air-out with cold wind or hot-blast and carries to indoor concrete step as follows:
s11, receiving a fresh air function starting instruction;
s12, the compressor and the indoor motor respectively operate to a set frequency and a set rotating speed;
s13, a refrigeration mode: if the outlet air temperature of the detected cold air is less than or equal to the set temperature Ta, the fresh air fan is started to extract the fresh air, and the fresh air and the cold air form mixed outlet air to be conveyed indoors;
heating mode: if the detected air outlet temperature of the hot air is larger than or equal to the set temperature Tb, the fresh air fan is started to extract the fresh air, and the fresh air and the hot air form mixed air outlet to be conveyed indoors.
Further, after the mixed outlet air is blown out, the frequency of the compressor, the running speed of the indoor side motor and the extraction amount of the fresh air fan are adjusted and controlled by detecting the outlet air temperature of the mixed outlet air, so that comfortable indoor natural air is obtained by the following specific steps:
s21, blowing mixed air into a room;
s22, a refrigeration mode: detecting the air outlet temperature of the mixed air outlet within the continuous time t 1; judging whether the outlet air temperature of the mixed outlet air is higher than a set temperature Tc or not;
heating mode: detecting the air outlet temperature of the mixed air outlet within the continuous time t 2; judging whether the outlet air temperature of the mixed outlet air is lower than a set temperature Td or not;
s23, if yes, adjusting the rotating speed of the indoor motor;
s24, a refrigeration mode: detecting the air outlet temperature of the mixed air outlet within the continuous time t 3; judging whether the outlet air temperature of the mixed outlet air is higher than a set temperature Tc or not; wherein t3 is more than t 1;
heating mode: detecting the air outlet temperature of the mixed air outlet within the continuous time t 4; judging whether the outlet air temperature of the mixed outlet air is lower than a set temperature Td or not; wherein t4 is more than t 2;
s25, if yes, the rotating speed of the indoor side motor at the air outlet temperature of the mixed air outlet is unchanged, and the frequency of the compressor is adjusted;
s26, a refrigeration mode: detecting the air outlet temperature of the mixed air outlet within the continuous time t 5; judging whether the outlet air temperature of the mixed outlet air is higher than a set temperature Tc or not; wherein t5 is more than t 3;
heating mode: detecting the air outlet temperature of the mixed air outlet within the continuous time t 6; judging whether the outlet air temperature of the mixed outlet air is lower than a set temperature Td or not; wherein t6 is more than t 4;
s27, if yes, the rotating speed of an indoor side motor and the frequency of a compressor are unchanged at the air outlet temperature of the mixed outlet air, and the extraction amount of a fresh air fan is adjusted;
s28, the air outlet temperature of the mixed air outlet meets the requirement, and comfortable indoor natural air is obtained.
Further, after the step S22, the fresh air control method further includes:
s231, if not, stably operating according to the parameters of the mixed outlet air detected in the step S22 under the outlet air temperature;
after the step S24, the fresh air control method further includes:
s251, if not, stably operating according to the parameters of the mixed outlet air detected in the step S24 under the outlet air temperature;
after the step S26, the fresh air control method further includes:
and S271, if not, stably operating according to the parameters of the mixed outlet air detected in the step S26 under the outlet air temperature.
Further, the set frequency of the compressor is 60 HZ-98 HZ; the set rotating speed of the indoor side motor is 500-1000 rpm.
Further, in the step S22, both t1 and t2 are 60S to 120S.
Further, in the step S24, both t3 and t4 are 120S to 300S.
Further, in the step S26, both t5 and t6 are 300S to 400S.
Further, in the step S22, the step S24 and the step S26, the temperature Tc is 10 ℃ to 16 ℃; the temperature Td is 38 ℃ to 46 ℃.
The invention provides a fresh air conditioner, which is used for realizing the fresh air control method; the system comprises a compressor, a four-way valve, an outdoor heat exchanger, an electronic expansion valve, an indoor heat exchanger, a fresh air fan and a temperature detection device; the compressor, the four-way valve, the outdoor heat exchanger, the electronic expansion valve and the indoor unit form a refrigerating or heating circulating flow path; the indoor unit comprises an indoor motor and an indoor unit air outlet; the temperature detection device is arranged on the air outlet of the internal machine.
Compared with the prior art, the invention has the following advantages:
according to the invention, the frequency of the compressor and the rotating speed of the indoor motor are respectively adjusted to the set frequency and rotating speed, and the fresh air function is started, so that the fresh air and cold air or hot air form mixed outlet air and are conveyed indoors; after mixed air-out blew out, the rethread detects the air-out temperature of mixing the air-out and comes the regulation and control compressor frequency, indoor side motor operation rotational speed and new fan extraction volume, makes the air-out temperature satisfy the requirement, avoids air-out temperature fluctuation great to obtain comfortable indoor natural wind, let the user obtain more comfortable experience.
Drawings
The present application will be described in further detail with reference to the following drawings and detailed description.
Fig. 1 is a flow chart of the fresh air control method of the present invention before mixing fresh air with cold air or hot air.
Fig. 2 is a flow chart of the fresh air control method of the present invention after mixing fresh air with cold air or hot air.
Fig. 3 is a schematic diagram of the fresh air conditioner of the present invention.
The figure includes:
the air conditioner comprises a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an electronic expansion valve 4, an indoor heat exchanger 5, an indoor side motor 51 and a fresh air fan 6.
Detailed Description
The present application is further described in conjunction with the following examples.
Example 1:
as shown in fig. 1 to 3, a fresh air conditioner includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an electronic expansion valve 4, an indoor heat exchanger 5, a fresh air fan 6 and a temperature detection device; the compressor 1, the four-way valve 2, the outdoor heat exchanger 3, the electronic expansion valve 4 and the indoor unit form a refrigerating or heating circulation flow path; specifically, communication pipelines are arranged between an exhaust port of the compressor 1 and a first port of the four-way valve 2, between a second port of the four-way valve 2 and the outdoor heat exchanger 3, between the outdoor heat exchanger 3 and the electronic expansion valve 4, between the electronic expansion valve 4 and the indoor heat exchanger 5, between the indoor heat exchanger 5 and a third port of the four-way valve 2, and between a fourth port of the four-way valve 2 and an air suction port of the compressor 1. The indoor unit comprises an indoor motor 51 and an indoor unit air outlet; the temperature detection device is arranged on the air outlet of the inner machine and used for detecting the air outlet temperature. The temperature detection device is a temperature sensor. The air outlet temperature is the air outlet temperature of cold air or hot air or the air outlet temperature of mixed air formed by fresh air and cold air or hot air.
The fresh air conditioner respectively adjusts the frequency of the compressor 1 and the rotating speed of the indoor motor 51 to set frequency and rotating speed, and starts a fresh air function to enable fresh air and cold air or hot air to form mixed outlet air and convey the mixed outlet air to the indoor; after mixed air-out blows off, the air-out temperature that rethread transition detection device detected mixed air-out comes the regulation and control compressor 1 frequency, indoor side motor 51 operation rotational speed and the new fan 6 volume of taking out, makes the air-out temperature satisfy the requirement, avoids air-out temperature fluctuation great to obtain comfortable indoor natural wind, let the user obtain more comfortable experience.
The invention also provides a fresh air control method, which is realized by using the fresh air conditioner, in a refrigeration mode or a heating mode, the frequency of the compressor 1 and the rotating speed of the indoor motor 51 are respectively adjusted to be set frequency and rotating speed, the fresh air fan 6 is started, fresh air is extracted, and mixed air outlet is formed by the fresh air and cold air or hot air and is conveyed indoors; the method comprises the following specific steps:
and S11, receiving a fresh air function starting instruction.
S12, the compressor 1 and the indoor motor 51 respectively operate to a set frequency and a set rotating speed; the set frequency of the compressor 1 is 60 HZ-98 HZ; the set rotation speed of the indoor motor 51 is 500rpm to 1000 rpm.
S13, a refrigeration mode: if the air outlet temperature of the detected cold air is less than or equal to the set temperature Ta, the fresh air fan 6 is started to extract the fresh air, and the fresh air and the cold air form mixed air outlet to be conveyed indoors.
Heating mode: if the detected air outlet temperature of the hot air is larger than or equal to the set temperature Tb, the fresh air fan 6 is started to extract the fresh air, and the fresh air and the hot air form mixed air outlet to be conveyed indoors.
In the step before the fresh air fan 6 is started, when the air conditioner receives an instruction of starting the fresh air function, the frequency of the compressor 1 is increased to a set frequency, wherein the set frequency of the refrigerating and heating mode can be set to different frequencies according to actual verification conditions, and the rotating speed of the indoor motor 51 is adjusted to a set rotating speed, wherein the set rotating speed of the refrigerating and heating mode can be set to different rotating speeds according to the actual verification conditions; then, the air outlet temperature is detected by a temperature detection device arranged on the air outlet of the inner machine to perform the following actions:
when the air conditioner operation mode is a cooling mode: when the outlet air temperature of the cold air is detected to be less than or equal to the temperature Ta; the fresh air fan 6 starts to operate, and outside natural air and cold air are mixed and conveyed to the room;
when the air conditioner operation mode is a heating mode: when the outlet air temperature of the detected hot air is more than or equal to the temperature Tb; the fresh air machine 6 starts to operate, and the outside natural wind and the hot wind are mixed and conveyed to the room.
After the mixed outlet air is blown out, the frequency of the compressor 1, the running rotating speed of the indoor motor 51 and the extraction amount of the fresh air fan 6 are adjusted and controlled by detecting the outlet air temperature of the mixed outlet air so as to obtain comfortable indoor natural air; the method comprises the following specific steps:
s21, blowing mixed air into a room;
s22, a refrigeration mode: detecting the air outlet temperature of the mixed air outlet within the continuous time t 1; judging whether the outlet air temperature of the mixed outlet air is higher than a set temperature Tc or not; the time t1 is 60s to 120s, preferably 80 s.
Heating mode: detecting the air outlet temperature of the mixed air outlet within the continuous time t 2; judging whether the outlet air temperature of the mixed outlet air is lower than a set temperature Td or not; the time t2 is 60s to 120s, preferably 80 s.
And S23, if so, adjusting the rotating speed of the indoor motor 51, and further adjusting the air outlet temperature of the mixed air outlet.
And S231, if not, stably operating according to the parameters of the mixed outlet air detected in the step S22 under the outlet air temperature. The parameters refer to the frequency of the compressor 1, the rotating speed of the indoor motor 51 and the extraction amount of the fresh air fan 6.
S24, a refrigeration mode: detecting the air outlet temperature of the mixed air outlet within the continuous time t 3; judging whether the outlet air temperature of the mixed outlet air is higher than a set temperature Tc or not; wherein t3 is more than t 1; the time t3 is 120s to 300s, preferably 200 s.
Heating mode: detecting the air outlet temperature of the mixed air outlet within the continuous time t 4; judging whether the outlet air temperature of the mixed outlet air is lower than a set temperature Td or not; wherein t4 is more than t 2; the time t4 is 120s to 300s, preferably 200 s.
And S25, if so, keeping the rotating speed of the indoor motor 51 at the outlet air temperature of the mixed outlet air unchanged, and adjusting the frequency extraction quantity of the compressor 1.
And S251, if not, stably operating according to the parameters of the mixed outlet air detected in the step S24 under the outlet air temperature. The parameters refer to the frequency of the compressor 1, the rotating speed of the indoor motor 51 and the extraction amount of the fresh air fan 6.
S26, a refrigeration mode: detecting the air outlet temperature of the mixed air outlet within the continuous time t 5; judging whether the outlet air temperature of the mixed outlet air is higher than a set temperature Tc or not; wherein t5 is more than t 3; the time t5 is 300s to 400s, preferably 360 s.
Heating mode: detecting the air outlet temperature of the mixed air outlet within the continuous time t 6; judging whether the outlet air temperature of the mixed outlet air is lower than a set temperature Td or not; wherein t6 is more than t 4; the time t6 is 300s to 400s, preferably 360 s.
And S27, if so, keeping the rotating speed of the indoor motor 51 and the frequency of the compressor 1 unchanged at the air outlet temperature of the mixed air outlet, and adjusting the extraction amount of the fresh air fan 6.
And S271, if not, stably operating according to the parameters of the mixed outlet air detected in the step S26 under the outlet air temperature. The parameters refer to the frequency of the compressor 1, the rotating speed of the indoor motor 51 and the extraction amount of the fresh air fan 6.
S28, the air outlet temperature of the mixed air outlet meets the requirement, and comfortable indoor natural air is obtained.
Preferably, in the steps of S22, S24 and S26, the temperature Tc of each step is the same, and the temperature Td of each step is the same, wherein the temperature Tc is 10-16 ℃; preferably 12 ℃; the temperature Td is 38-46 ℃; preferably 42 c, which by defining the temperature Tc and the temperature Td, facilitates the regulation control of the compressor 1 frequency, the indoor side motor 51 operation speed and the fresh air machine 6 extraction amount to obtain a comfortable indoor natural wind.
Adjust the air-out temperature behind room cold wind or hot-blast and the new trend mixture through above three kinds of control methods, make the air-out temperature satisfy required requirement, avoid air-out temperature fluctuation great to obtain comfortable indoor natural wind, let the user obtain more comfortable experience.
Example 2
In this embodiment 2, the fresh air control method of this embodiment is basically the same as that of embodiment 1, except that the sequence of three control modes for adjusting the frequency of the compressor 1, the rotation speed of the indoor motor 51, and the extraction amount of the fresh air fan 6 is changed. In embodiment 1, the sequence of the three control modes is to adjust the rotation speed of the indoor motor 51, the frequency of the compressor 1 and the extraction amount of the new fan 6, while in this embodiment, the sequence of the three control modes is to adjust the rotation speed of the indoor motor 51, the extraction amount of the new fan 6 and the frequency of the compressor 1; or adjusting the frequency of the compressor 1, the rotating speed of the indoor motor 51, the extraction amount of the fresh air fan 6, and the like.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the protection scope of the present application, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.

Claims (9)

1. A fresh air control method is characterized in that in a cooling mode or a heating mode, the frequency of a compressor and the rotating speed of an indoor motor are respectively adjusted to be set frequency and rotating speed, a fresh air fan is started to extract fresh air, and the fresh air and cold air or hot air form mixed air outlet to be conveyed indoors; after the mixed outlet air is blown out, the frequency of a compressor, the running rotating speed of an indoor side motor and the extraction amount of a fresh air fan are adjusted and controlled by detecting the outlet air temperature of the mixed outlet air to obtain comfortable indoor natural air,
after mixed air-out blows out, adjust control compressor frequency, indoor side motor operation rotational speed and new fan extraction volume through the air-out temperature that detects mixed air-out to obtain comfortable indoor natural wind concrete step as follows:
s21, blowing mixed air into a room;
s22, a refrigeration mode: detecting the air outlet temperature of the mixed air outlet within the continuous time t 1; judging whether the outlet air temperature of the mixed outlet air is higher than a set temperature Tc or not;
heating mode: detecting the air outlet temperature of the mixed air outlet within the continuous time t 2; judging whether the outlet air temperature of the mixed outlet air is lower than a set temperature Td or not;
s23, if yes, adjusting the rotating speed of the indoor motor;
s24, a refrigeration mode: detecting the air outlet temperature of the mixed air outlet within the continuous time t 3; judging whether the outlet air temperature of the mixed outlet air is higher than a set temperature Tc or not; wherein t3 is more than t 1;
heating mode: detecting the air outlet temperature of the mixed air outlet within the continuous time t 4; judging whether the outlet air temperature of the mixed outlet air is lower than a set temperature Td or not; wherein t4 is more than t 2;
s25, if yes, the rotating speed of the indoor side motor at the air outlet temperature of the mixed air outlet is unchanged, and the frequency of the compressor is adjusted;
s26, a refrigeration mode: detecting the air outlet temperature of the mixed air outlet within the continuous time t 5; judging whether the outlet air temperature of the mixed outlet air is higher than a set temperature Tc or not; wherein t5 is more than t 3;
heating mode: detecting the air outlet temperature of the mixed air outlet within the continuous time t 6; judging whether the outlet air temperature of the mixed outlet air is lower than a set temperature Td or not; wherein t6 is more than t 4;
s27, if yes, the rotating speed of an indoor side motor and the frequency of a compressor are unchanged at the air outlet temperature of the mixed outlet air, and the extraction amount of a fresh air fan is adjusted;
s28, the air outlet temperature of the mixed air outlet meets the requirement, and comfortable indoor natural air is obtained.
2. The fresh air control method according to claim 1, wherein the specific steps of adjusting the compressor frequency and the indoor motor speed to a set frequency and a set speed respectively, starting the fresh air fan, extracting fresh air, mixing the fresh air with cold air or hot air to form mixed air, and conveying the mixed air to the indoor space are as follows:
s11, receiving a fresh air function starting instruction;
s12, the compressor and the indoor motor respectively operate to a set frequency and a set rotating speed;
s13, a refrigeration mode: if the outlet air temperature of the detected cold air is less than or equal to the set temperature Ta, the fresh air fan is started to extract the fresh air, and the fresh air and the cold air form mixed outlet air to be conveyed indoors;
heating mode: if the detected air outlet temperature of the hot air is larger than or equal to the set temperature Tb, the fresh air fan is started to extract the fresh air, and the fresh air and the hot air form mixed air outlet to be conveyed indoors.
3. The fresh air control method according to claim 1, wherein after the step S22, the fresh air control method further comprises:
s231, if not, stably operating according to the parameters of the mixed outlet air detected in the step S22 under the outlet air temperature;
after the step S24, the fresh air control method further includes:
s251, if not, stably operating according to the parameters of the mixed outlet air detected in the step S24 under the outlet air temperature;
after the step S26, the fresh air control method further includes:
and S271, if not, stably operating according to the parameters of the mixed outlet air detected in the step S26 under the outlet air temperature.
4. The fresh air control method according to claim 1, wherein; the set frequency of the compressor is 60 HZ-98 HZ; the set rotating speed of the indoor side motor is 500-1000 rpm.
5. The fresh air control method according to claim 1, wherein in the step S22, both t1 and t2 are 60S to 120S.
6. The fresh air control method according to claim 1, wherein in the step S24, both t3 and t4 are 120S to 300S.
7. The fresh air control method according to claim 1, wherein in the step S26, both t5 and t6 are 300S to 400S.
8. The fresh air control method according to claim 1, wherein in the steps of S22, S24 and S26, the temperature Tc is 10 ℃ to 16 ℃; the temperature Td is 38 ℃ to 46 ℃.
9. A fresh air conditioner, characterized in that, it is used for realizing the fresh air control method of any claim 1 to 8; the system comprises a compressor, a four-way valve, an outdoor heat exchanger, an electronic expansion valve, an indoor heat exchanger, a fresh air fan and a temperature detection device; the compressor, the four-way valve, the outdoor heat exchanger, the electronic expansion valve and the indoor unit form a refrigerating or heating circulating flow path; the indoor unit comprises an indoor motor and an indoor unit air outlet; the temperature detection device is arranged on the air outlet of the internal machine.
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