CN111964212A - Control method, control device and air conditioning system - Google Patents
Control method, control device and air conditioning system Download PDFInfo
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- CN111964212A CN111964212A CN202010724590.8A CN202010724590A CN111964212A CN 111964212 A CN111964212 A CN 111964212A CN 202010724590 A CN202010724590 A CN 202010724590A CN 111964212 A CN111964212 A CN 111964212A
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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
- F24F11/42—Defrosting; Preventing freezing of outdoor 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
- 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
- F24F11/46—Improving electric energy efficiency or saving
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/81—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the air supply to heat-exchangers or bypass channels
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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
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a control method, a control device and an air conditioning system, and relates to the technical field of air conditioners. The control method comprises the following steps: acquiring the temperature difference between the indoor environment temperature and the indoor set temperature; controlling the running states of the air conditioner and the air return device according to the temperature difference and a preset working mode of the air conditioner; the air return device is used for conveying indoor air to an external unit heat exchanger of the air conditioner. The control method can control the air conditioner system to quickly adjust the air-conditioned room to the proper temperature and maintain the air-conditioned room at the proper temperature by running at low frequency, and has strong practicability and energy conservation; in addition, the air return device can effectively utilize the waste heat of the air conditioner room, reduce the waste of cold or heat and improve the energy efficiency of the air conditioner.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method, a control device and an air conditioning system.
Background
The air conditioning system is widely applied to the regulation of indoor temperature, when the air conditioning system operates, in order to reduce the dissipation of indoor heat or cold, the indoor environment is generally a closed environment, and along with the respiration of people in the room, the indoor air can become turbid after a period of time; in order to improve the freshness of indoor air, the conventional air conditioning system is generally provided with a fresh air device capable of conveying outdoor fresh air to the indoor space, however, as the fresh air device supplements the indoor air, the air pressure of the indoor environment is increased, and the indoor air is scattered into the outdoor environment through door seams, window seams and the like, so that cold or heat waste is caused.
Disclosure of Invention
The invention aims to provide a control method, a control device and an air conditioning system, and aims to solve the technical problems that an air conditioner is low in energy efficiency and energy is wasted due to the fact that waste heat of an air-conditioned room escapes.
To solve the above problem, the present invention provides a control method, including: acquiring the temperature difference between the indoor environment temperature and the indoor set temperature; controlling the running states of the air conditioner and the air return device according to the temperature difference and a preset working mode of the air conditioner; the air return device is used for conveying indoor air to an external unit heat exchanger of the air conditioner.
The control device provided by the invention can obtain the temperature adjusting effect of the current air conditioner on the air-conditioned room according to the temperature difference between the indoor environment temperature and the indoor set temperature, and correspondingly control and adjust the switch, the running frequency and the like of the air conditioner, so that the air-conditioned room can quickly reach the indoor set temperature and is maintained in the range near the indoor set temperature at low frequency, and on the basis of ensuring the use comfort of a user, the power consumption of the air conditioner can be saved, and the electric energy consumption is reduced; in addition, the on-off state of the air return device is controlled through the temperature adjusting effect of the current air conditioner on the air conditioning room, so that waste heat in the air conditioning room can be effectively utilized, and the temperature adjusting energy efficiency of the air conditioner is effectively improved through adjusting the pressure of the side system of the outer machine heat exchanger by indoor air.
Optionally, when the preset operation mode is the cooling mode, the step of controlling the operation states of the air conditioner and the air return device according to the temperature difference and the preset operation mode of the air conditioner includes: if the temperature difference is greater than a first temperature threshold value, controlling the air conditioner to operate at a lifting frequency, and controlling the air return device to be in an open state, wherein the first temperature threshold value is greater than zero; if the temperature difference is smaller than or equal to the first temperature threshold and larger than or equal to the second temperature threshold, controlling the air conditioner to reduce the frequency to operate and controlling the air return device to be in a closed state, wherein the second temperature threshold is smaller than zero; and if the temperature difference is smaller than the second temperature threshold value, controlling the air conditioner to stop and controlling the air return device to be in a closed state.
In the refrigeration mode, the temperature regulation state of the air conditioner to the air conditioning room is obtained according to the comparison between the temperature difference and the indoor set temperature, when the temperature of the air conditioning room is higher, the refrigeration frequency of the air conditioner to the air conditioning room is improved, and the air return device is started to reduce the system pressure of the air conditioner, so that the refrigeration energy efficiency of the air conditioner is further improved; when the temperature of the air conditioning room is proper, the air conditioner is controlled to operate at a low frequency, so that energy and electricity are saved; when the temperature of the air conditioning room is low, the air conditioner is turned off, so that energy and electricity are saved.
Optionally, when the preset operating mode is a heating mode, the step of controlling the operating states of the air conditioner and the air return device according to the temperature difference and the preset operating mode of the air conditioner includes: if the temperature difference is greater than a third temperature threshold value, controlling the air conditioner to stop and controlling the air return device to be in a closed state, wherein the third temperature threshold value is greater than zero; if the temperature difference is smaller than or equal to the third temperature threshold and larger than or equal to the fourth temperature threshold, controlling the air conditioner to reduce the frequency to operate and controlling the air return device to be in a closed state, wherein the fourth temperature threshold is smaller than zero; and if the temperature difference is smaller than the fourth temperature threshold, controlling the air conditioner to operate at a lifting frequency, and controlling the air return device to be in an open state.
In the heating mode, the temperature regulation state of the air conditioner to the air-conditioning room is obtained according to the comparison between the temperature difference and the indoor set temperature, when the temperature of the air-conditioning room is lower, the heating frequency of the air conditioner to the air-conditioning room is increased, and the system pressure of the air conditioner is increased by starting the air return device, so that the heating energy efficiency of the air conditioner is further improved; when the temperature of the air conditioning room is proper, the air conditioner is controlled to operate at a low frequency, so that energy and electricity are saved; when the temperature of the air conditioning room is higher, the air conditioner is turned off, so that energy and electricity are saved.
Optionally, when the air conditioner executes a heating mode, the method includes: acquiring the temperature of an outer machine heat exchanger and the set temperature of an outer machine; judging whether the temperature of the heat exchanger of the external machine is greater than or equal to the set temperature of the external machine or not; if so, controlling the running states of the air conditioner and the air return device according to the temperature difference and a preset working mode of the air conditioner; if not, the air conditioner is controlled to enter a defrosting mode, and the air return device is controlled to be in a closed state. The heating energy efficiency of the air conditioner is ensured by effectively defrosting the external heat exchanger.
Optionally, when the fresh air device and the return air device of the air conditioner are both in an open state, the return air quantity of the return air device is controlled to be smaller than the supply air quantity of the fresh air device. The air pressure in the air-conditioned room is ensured to be higher than that in the outdoor environment, so that the air pressure in the air-conditioned room is reduced to be lower than that in the outdoor environment, and outdoor uncooled or heated air enters the air-conditioned room through the door and window gaps, thereby influencing the temperature in the air-conditioned room and the temperature regulation energy efficiency of the air conditioner.
The present embodiment also provides a control apparatus, including: the acquisition module is used for acquiring indoor environment temperature and indoor set temperature; the calculation module is used for calculating the temperature difference between the indoor environment temperature and the indoor set temperature; and the control module controls the running states of the air conditioner and the air return device according to the temperature difference and the preset working mode of the air conditioner.
The embodiment also provides an air conditioning system which can execute the control method.
Optionally, the air conditioning system comprises an air conditioner and an air return device, wherein an air inlet end of the air return device is communicated with an indoor environment, an air outlet end of the air return device is communicated with an outdoor environment, and an outer machine heat exchanger of the air conditioner is located in an air outlet area of the air outlet end. The air return device can return partial air in the air-conditioned room to the outdoor environment, and can recycle cold energy or heat energy of redundant air on the basis of adjusting the air pressure in the air-conditioned room, so that the temperature adjusting effect of the air conditioner on the air-conditioned room is improved, and the use comfort of a user is further improved.
Optionally, the air inlet end is provided with a filter assembly. The filtering component can separate and block impurities in the indoor environment so as to reduce the blockage of the impurities entering the return air pipe on the return air pipe or the driving part and influence the use condition of the return air device.
Optionally, the gas outlet end is provided with an injector, the injector comprises an injection pipe, and the injection pipe is provided with a plurality of dispersedly arranged gas injection holes. The air conditioner has the advantages that the heat exchange area of the air return device and the outer machine heat exchanger can be increased, the air outlet speed can be reduced, the heat exchange time of the sprayed gas and the outer machine heat exchanger is prolonged, and therefore the temperature regulation energy efficiency of the air conditioner is improved.
Optionally, the ejector is connected to an outdoor unit of the air conditioner, and the air injection holes are all directed toward the outdoor unit heat exchanger. The arrangement can improve the accuracy of the relative position of the ejector and the outer machine heat exchanger and ensure the heat exchange between the ejector and the outer machine heat exchanger.
Optionally, the number of the gas injection holes is at least two, and each row of the gas injection holes is arranged along the axial direction of the injection pipe. The air outlet range of the air return device is enlarged, the heat exchange area of the sprayed gas and the outer machine heat exchanger is correspondingly enlarged, the heat exchange efficiency of the outer machine heat exchanger and the sprayed gas is improved, and the temperature adjusting effect of the air conditioner on an air conditioning room is further improved.
Optionally, when the air conditioning system is in operation, the air inlet end is lower than an air outlet of an indoor unit of the air conditioner. The indoor air in the lower area of the indoor unit can be sucked to the outside, and the indoor unit and the air return device jointly act to form airflow circulation in the air-conditioned room, so that the uniformity of the air temperature in the air-conditioned room is improved, and the use comfort of a user is correspondingly improved; the air conditioner in winter has a good heating mode effect, and can effectively solve the problem that hot air blown out by the indoor unit is retained at a high place and cannot fall to the ground, so that the indoor unit in the air-conditioned room is warm up and cool down.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic flow chart of a control method according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a control method of the air conditioner according to an embodiment of the present invention when the air conditioner performs a cooling mode;
FIG. 3 is a schematic diagram of a first logic flow of a control method when the air conditioner performs the cooling mode according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a second determination logic flow of the control method when the air conditioner performs the cooling mode according to the embodiment of the present invention;
FIG. 5 is a schematic diagram of a third logic flow of the control method when the air conditioner performs the cooling mode according to the embodiment of the present invention;
FIG. 6 is a flowchart illustrating a control method of the air conditioner according to the embodiment of the present invention when the air conditioner executes the heating mode;
FIG. 7 is a schematic diagram of a first logic flow of a control method when the air conditioner performs the heating mode according to an embodiment of the present invention;
FIG. 8 is a block diagram of a control device according to an embodiment of the present invention;
FIG. 9 is a system schematic of an air conditioning system provided by an embodiment of the present invention;
fig. 10 is a schematic view illustrating an outdoor unit having a spray pipe installed therein according to an embodiment of the present invention;
FIG. 11 is a schematic radial cross-sectional view of the ejector tube of FIG. 10, with arrows indicating the direction of gas egress at the gas injection holes;
fig. 12 is a schematic view illustrating a connection between a filter assembly and a return duct in an air conditioning system according to an embodiment of the present invention.
Description of reference numerals:
1-an air conditioner; 11-a compressor; 12-a four-way valve; 13-an indoor unit; 14-an outdoor unit; 141-an outdoor unit heat exchanger; 15-a throttle valve; 16-communicating tube; 17-buckling; 2-an air return device; 21-a filter assembly; 211-a return air box; 212-return air holes; 22-an ejector; 221-an injection pipe; 222 — a first gas injection hole; 223-a second gas injection hole; 23-a return air pipe; 24-a drive member; 3-a fresh air device; 4-air-conditioned room; 81-an acquisition module; 82-a calculation module; 83-control 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. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
An embodiment of the invention provides a control method, a control device and an air conditioning system, as shown in fig. 1 to 12. Fig. 9 is a system schematic diagram of an air conditioning system according to an embodiment of the present invention. The air conditioning system shown in fig. 9, in which the air conditioner 1 includes a compressor 11, a four-way valve 12, an indoor unit 13, a throttle valve 15, and an outdoor unit 14, which are connected in a closed loop by a communication pipe 16, is capable of performing the above-described control method. The indoor unit 13 is provided with a fresh air device 3 for communicating the outdoor environment with the interior of the air-conditioned room, and the fresh air device 3 is used for conveying outdoor air to the interior of the air-conditioned room 4; the outdoor unit 14 is provided with an air returning device 2 for communicating the outdoor environment with the inside of the air-conditioned room 4, and the air returning device 2 is used for conveying the air inside the air-conditioned room 4 to an outdoor unit heat exchanger 141 of the outdoor unit 14. Fig. 10 is a schematic view illustrating an air conditioning system according to an embodiment of the present invention in which the injection pipe 221 is installed in the outdoor unit 14; fig. 11 is a schematic radial cross-sectional view of the injection pipe 221 of fig. 10, and arrows therein indicate the gas outlet direction at the gas injection holes; fig. 12 is a schematic diagram illustrating the connection between the filter assembly 21 and the return air duct 23 in the air conditioning system according to the embodiment of the present invention.
Fig. 1 is a schematic flow chart of a control method according to an embodiment of the present invention. As shown in fig. 1, the control method includes:
s102 acquires a temperature difference between the indoor ambient temperature and the indoor set temperature.
And S104, controlling the running states of the air conditioner 1 and the air return device according to the temperature difference and the preset working mode of the air conditioner 1.
The air return device is used to deliver indoor air to the outdoor unit heat exchanger 141 of the air conditioner 1.
The temperature adjusting effect of the air conditioner 1 on the air conditioning room at present is obtained by judging the temperature difference between the indoor environment temperature and the indoor set temperature, the on-off, the running frequency and the like of the air conditioner 1 are correspondingly controlled and adjusted, and the running frequency of the air conditioner 1 is improved, so that the air conditioning room can quickly reach the indoor set temperature, and the use comfort of a user is improved; by reducing the operating frequency of the air conditioner 1 or turning off the air conditioner 1, the air-conditioned room can be maintained in a range near the indoor set temperature, the power consumption of the air conditioner can be saved on the basis of ensuring the use comfort of a user, and the electric energy consumption is reduced.
In addition, the on-off state of the air returning device is controlled through the temperature adjusting effect of the current air conditioner on the air conditioning room, so that waste heat in the air conditioning room can be effectively utilized, and the temperature adjusting energy efficiency of the air conditioner 1 is effectively improved through adjusting the pressure of the system on the side of the outer machine heat exchanger 141 by indoor air.
Fig. 2 is a flowchart illustrating a control method when the air conditioner 1 according to the embodiment of the present invention executes the cooling mode. As shown in fig. 2, when the air conditioner 1 performs the cooling mode, the step of controlling the operation states of the air conditioner 1 and the air returning device according to the temperature difference in step S104 includes:
and S202, if the temperature difference is greater than a first temperature threshold value, controlling the air conditioner 1 to increase the frequency to operate, and controlling the air return device to be in an open state, wherein the first temperature threshold value is greater than zero.
The air conditioner 1 executes a refrigeration mode, the indoor unit performs refrigeration operation in the air-conditioned room, when the temperature difference is greater than a first temperature threshold value, the current indoor environment temperature in the air-conditioned room is higher than the indoor set temperature set by a user, and the higher temperature value is larger, the running frequency of the air conditioner 1 is correspondingly controlled and improved, the refrigeration effect of the air conditioner 1 on the air-conditioned room is improved, and the speed of reaching the indoor set temperature in the air-conditioned room is accelerated; meanwhile, because the indoor environment temperature in the air-conditioning room is lower than the outdoor environment temperature, the air return device is opened and conveys the indoor low-temperature air to the outdoor unit heat exchanger 141 of the outdoor unit, thereby reducing the air inlet temperature of the outdoor unit, correspondingly reducing the condensing pressure of the outdoor unit and the evaporating pressure of the indoor unit, improving the heat exchange quantity between the indoor unit and the indoor environment, improving the refrigerating effect of the indoor unit in the air-conditioning room, further accelerating the speed of reaching comfortable temperature in the air-conditioning room, and further improving the practicability of an air-conditioning system and the use comfort of a user. In particular, the first temperature threshold may be chosen between 1 ° and 3 °, preferably 2 °.
And S204, if the temperature difference is less than or equal to the first temperature threshold and greater than or equal to the second temperature threshold, controlling the air conditioner 1 to reduce the frequency to operate and controlling the air return device to be in a closed state, wherein the second temperature threshold is less than zero.
The temperature difference is less than or equal to a positive first temperature threshold value and more than or equal to a negative second temperature threshold value, which indicates that the current indoor environment temperature in the air-conditioned room is higher than or lower than the indoor set temperature, and the higher temperature value or the lower temperature value is smaller, namely, the indoor environment temperature is in the range near the indoor set temperature and is at the proper temperature; the air conditioner 1 is controlled to operate at a low frequency, so that the current temperature state in the air-conditioned room can be maintained, and the consumption of the operation of the air conditioner 1 on electric energy is reduced on the basis of ensuring the temperature adjustment of the air conditioner 1 in the air-conditioned room. In addition, because the indoor environment temperature of the current air-conditioned room is more appropriate, and the air conditioner 1 runs at low frequency without assistance, the air return device can be closed, so that the dissipation of cold energy in the air-conditioned room by air return operation is reduced. In particular, the second temperature threshold may be chosen between-3 ° and-1 °, preferably-2 °.
And S206, if the temperature difference is smaller than the second temperature threshold, controlling the air conditioner 1 to stop, and controlling the air return device to be in a closed state.
If the temperature difference is less than the negative second temperature threshold, it indicates that the current indoor environment temperature in the air-conditioned room is lower than the indoor set temperature, and the lower temperature value is larger, that is, the current indoor environment temperature in the air-conditioned room is lower; therefore, the air conditioner 1 can be controlled to be turned off, and the cooling operation of the air conditioner 1 on the air conditioning room is stopped, so that the low-temperature environment in the air conditioning room is gradually warmed up. Correspondingly, when the air conditioner 1 is in a closed state, the air return device is closed, the air return device is stopped to output indoor low-temperature air outwards, and the dissipation of cold in the air-conditioned room is reduced.
Preferably, the control method can be adopted in the whole process of the operation of the air conditioning system so as to realize the intelligent regulation of the air conditioning system on the temperature in the air conditioning room, and the air conditioning system is convenient to use and high in regulation energy efficiency; specifically, the operating frequency of the air conditioner 1 may be adjusted by adjusting the rotation speed of the compressor 11, the rotation speed of the indoor fan, the rotation speed of the outdoor fan, and the like.
Fig. 3 is a schematic diagram of a first logic flow of the control method when the air conditioner 1 executes the cooling mode according to the embodiment of the invention. As shown in fig. 3, when the air conditioner 1 performs the cooling mode, the step of controlling the operation states of the air conditioner 1 and the return air device according to the temperature difference and the preset operation mode of the air conditioner 1 in step S104 includes:
s302 judges whether or not the temperature difference DeltaT is larger than a first temperature threshold T1Wherein, T1＞0°。
The temperature difference can represent the difference between the current indoor environment temperature in the air-conditioned room and the indoor set temperature set by the user, and the temperature difference is compared with the first temperature threshold value to judge the temperature adjusting effect of the air-conditioned room when the air conditioner 1 operates at the current operating frequency.
S304 and S302, if yes, controlling the air conditioner 1 to increase the frequency and turning on the air returning device. Δ T > T1The current indoor environment temperature in the air-conditioned room is higher than the indoor set temperature set by the user, and the higher temperature value is larger, that is, the current indoor environment temperature in the air-conditioned room is higher.
S306, in step S302, if not, continuously judging whether the delta T is smaller than a second temperature threshold T2Wherein, T2＜0°。ΔT≤T1If so, it indicates that the air conditioner 1 has already achieved a better cooling effect for the air-conditioned room, and continues to determine whether the current indoor ambient temperature in the air-conditioned room is too low.
S308 and S306, if yes, the air conditioner 1 is controlled to stop, and the air returning device is controlled to be in the off state. Delta T < T2The current indoor environment temperature in the air-conditioned room is lower than the indoor set temperature, and the lower temperature value is larger, that is, the current indoor environment temperature in the air-conditioned room is lower.
In step S310, if not, the air conditioner 1 is controlled to operate at a reduced frequency, and the air returning device is controlled to be in an off state. T is1≤ΔT≤T2The temperature value is higher than or lower than the indoor set temperature, and the higher temperature value or the lower temperature value is smaller, that is, the indoor environment temperature is in the range near the indoor set temperature and is at the appropriate temperature.
Fig. 4 is a schematic diagram of a second judgment logic flow of the control method when the air conditioner 1 executes the cooling mode according to the embodiment of the invention. As shown in fig. 8, when the air conditioner 1 performs the cooling mode, the step of controlling the operation states of the air conditioner 1 and the return air device according to the temperature difference and the preset operation mode of the air conditioner 1 in step S104 includes:
s402, judging whether delta T is smaller than a second temperature threshold T2Wherein, T2＜0°。
S404 and S402, if yes, the air conditioner 1 is controlled to stop, and the air returning device is controlled to be in the off state.
S406, in step S402, if not, it is continuously determined whether Δ T is greater than the first temperature threshold T1Wherein, T1＞0°。
S408 and S406, if yes, controlling the air conditioner 1 to increase the frequency and controlling the air returning device to be in an on state.
In step S410 and step S406, if not, the air conditioner 1 is controlled to operate at a reduced frequency, and the air returning device is controlled to be in an off state.
Fig. 5 is a schematic diagram of a third determination logic flow of the control method when the air conditioner 1 executes the cooling mode according to the embodiment of the invention. As shown in fig. 5, when the air conditioner 1 performs the cooling mode, the step of controlling the operation states of the air conditioner 1 and the return air device according to the temperature difference and the preset operation mode of the air conditioner 1 in step S104 includes:
s501, judging whether the delta T is in a preset temperature difference range.
And S502, if so, controlling the air conditioner 1 to reduce the frequency to operate, and controlling the air return system to be in a closed state.
If not, S503 is executed to determine whether Δ T is smaller than the minimum value of the preset temperature difference range.
In step S504, if yes, the air conditioner 1 is controlled to stop, and the air return system is controlled to be in an off state.
In step S502, if not, step S503 is executed and step S505 is executed, and it is determined whether Δ T is greater than the maximum value of the preset temperature difference range.
S506, if yes, the air conditioner 1 is controlled to operate at a higher frequency, and the air return system is controlled to be in an on state.
Fig. 6 is a flowchart illustrating a control method when the air conditioner 1 according to the embodiment of the present invention executes the heating mode. When the preset operation mode is the heating mode, in step S105, the step of controlling the operation states of the air conditioner 1 and the air returning device according to the temperature difference and the preset operation mode of the air conditioner 1 includes:
and S602, if the temperature difference is greater than a third temperature threshold value, controlling the air conditioner 1 to stop and controlling the air return device to be in a closed state, wherein the third temperature threshold value is greater than zero.
The air conditioner 1 executes a heating mode, the indoor unit performs heating operation in the air-conditioned room, and when the temperature difference is greater than a third temperature threshold value, the current indoor environment temperature in the air-conditioned room is higher than the indoor set temperature set by the user, and the raised temperature value is larger, that is, the temperature in the air-conditioned room is higher; the air conditioner 1 is correspondingly controlled to stop, and the heating operation of the air conditioner 1 to the air conditioning room is stopped, so that the high-temperature environment in the air conditioning room is gradually cooled to the proper temperature. Correspondingly, when the air conditioner 1 is in a closed state, the air return device is closed, the air return device is stopped to output indoor high-temperature air outwards, and heat loss in the air-conditioned room is reduced. In particular, the third temperature threshold may be chosen between 1 ° and 3 °, preferably 2 °.
And S604, if the temperature difference is less than or equal to the third temperature threshold and greater than or equal to the fourth temperature threshold, controlling the air conditioner 1 to reduce the frequency to operate and controlling the air returning device to be in a closed state, wherein the fourth temperature threshold is less than zero.
The temperature difference is less than or equal to the positive third temperature threshold and more than or equal to the negative fourth temperature threshold, which indicates that the current indoor environment temperature in the air-conditioned room is higher than or lower than the indoor set temperature, and the higher temperature value or the lower temperature value is smaller, namely, the indoor environment temperature is in the range near the indoor set temperature and is at the proper temperature; the air conditioner 1 is controlled to operate at a low frequency, so that the current temperature state in the air-conditioned room can be maintained, and the consumption of the operation of the air conditioner 1 on electric energy is reduced on the basis of ensuring the temperature adjustment of the air conditioner 1 in the air-conditioned room. In addition, because the indoor environment temperature of the current air-conditioned room is more appropriate, and the air conditioner 1 runs at low frequency without assistance, the air return device can be closed, so that the dissipation of cold energy in the air-conditioned room by air return operation is reduced. In particular, the fourth temperature threshold may be chosen between-3 ° and-1 °, preferably-2 °.
And S606, if the temperature difference is smaller than the fourth temperature threshold, controlling the air conditioner 1 to increase the frequency to operate, and controlling the air return device to be in an open state.
If the temperature difference is less than the negative fourth temperature threshold, it indicates that the current indoor environment temperature in the air-conditioned room is lower than the indoor set temperature, and the lower temperature value is larger, that is, the current indoor environment temperature in the air-conditioned room is lower; correspondingly controlling and improving the running frequency of the air conditioner 1, improving the heating effect of the air conditioner 1 on an air conditioning room, and accelerating the speed of reaching the indoor set temperature in the air conditioning room; meanwhile, because the indoor environment temperature in the air-conditioning room is higher than the outdoor environment temperature, the air return device is opened and conveys indoor high-temperature air to the outdoor unit heat exchanger 141 of the outdoor unit, so that the air inlet temperature of the outdoor unit is raised, the low pressure of the system is correspondingly promoted, the heat exchange quantity of the indoor unit and the indoor environment is increased, the heating effect of the indoor unit in the air-conditioning room is improved, the speed of reaching comfortable temperature in the air-conditioning room is further increased, and the practicability of the air-conditioning system and the use comfort of a user are further improved.
Optionally, in this embodiment, when the air conditioner 1 executes the heating mode, the following operations may be performed, and the operation steps include: acquiring the temperature of an outer machine heat exchanger 141 and the set temperature of an outer machine; judging whether the temperature of the heat exchanger of the external machine is greater than or equal to the set temperature of the external machine or not; if yes, executing step 104 to control the operation states of the air conditioner 1 and the air return device according to the temperature difference and the preset working mode of the air conditioner 1; if not, the air conditioner 1 is controlled to enter a defrosting mode, and the air returning device is controlled to be in a closed state.
When the air conditioner 1 executes a heating mode, the outdoor unit is in a low-temperature state as an evaporator, the frosting condition of the outdoor unit heat exchanger 141 is judged by comparing the temperature of the outdoor unit heat exchanger with the set temperature of the outdoor unit, when the temperature of the outdoor unit heat exchanger is lower than the set temperature of the outdoor unit, the temperature of the outdoor unit heat exchanger is over low, a frosting layer is formed on the outdoor unit heat exchanger, the air conditioner 1 is correspondingly controlled to enter a defrosting mode, and the outdoor unit heat exchanger 141 is defrosted to ensure the heating energy efficiency of the air conditioner; when the temperature of the external unit heat exchanger is equal to or higher than the set temperature of the external unit, which indicates that the external unit heat exchanger 141 can normally operate, the air conditioner 1 continues to execute step S104, and the operating states of the air conditioner 1 and the air return device are controlled.
Specifically, the defrost mode may include: the air conditioner 1 converts the heating mode into the cooling mode, and the outdoor unit heat exchanger 141 is in a high-temperature state as a condenser to melt the frost layer on the outdoor unit heat exchanger; after the defrosting is completed, when the temperature of the external unit heat exchanger is greater than or equal to the external set temperature, the air conditioner 1 is controlled to continue the heating mode, and step S104 is executed.
Fig. 7 is a schematic diagram of a first logic flow of the control method when the air conditioner 1 executes the heating mode according to the embodiment of the invention. As shown in fig. 7, the air conditioner 1, when performing the heating mode, includes the steps of:
s701 acquiring indoor environment temperature TInner ringAnd indoor set temperature TInner setThe temperature difference delta T, the temperature of the heat exchanger of the outdoor unit and the set temperature of the outdoor unit.
S702 judges the temperature T of the heat exchanger of the outdoor unitOuter plateWhether the temperature is more than or equal to the set temperature T of the outdoor unitPeripheral equipment。
If not, the air conditioner 1 is controlled to execute the cooling mode in step S703.
If S704 is true, whether the temperature difference Delta T is larger than a fourth temperature threshold T is judged4。
S705 and S704, if not, controlling the air conditioner 1 to increase the frequency and turning on the air returning device.
In step S704, if yes, step S706 is executed to determine whether the temperature difference Δ T is greater than the third temperature threshold T3。
If yes, step S707 is executed to stop the air conditioner 1 and to turn off the air returning device in step S706.
If not, step S708 is executed to control the air conditioner 1 to operate at a reduced frequency and to control the air returning device to be in an off state in step S706.
Optionally, when the air conditioner executes the heating mode, in the step S104, the operating states of the air conditioner 1 and the air returning device are controlled according to the temperature difference and the preset working mode of the air conditioner 1, and besides the above judgment logic, other judgment logics in the cooling mode may also be referred to, which is not described herein again.
In this embodiment, the control method further includes: when the fresh air device and the air return device of the air conditioner 1 are both in an open state, the air return amount of the air return device is controlled to be smaller than the air supply amount of the fresh air device. The fresh air device continuously replenishes fresh air into the air-conditioned room, the air pressure in the air-conditioned room is increased, and the air return device conveys redundant air in the air-conditioned room to the external machine heat exchanger 141, so that the temperature regulation energy efficiency of the air conditioner 1 to the air-conditioned room is effectively improved; in addition, the return air volume of the return air device is smaller than the air supply volume of the fresh air device, and the air pressure in the air-conditioned room can be ensured to be higher than the air pressure in the air-conditioned room, so that the air pressure in the air-conditioned room is lower than the air pressure in the outdoor environment, the outdoor air which is not refrigerated or heated enters the air-conditioned room through the door and window gaps, and the temperature in the air-conditioned room and the temperature regulation energy efficiency of the air conditioner 1 are.
Fig. 8 is a block diagram of a control device according to an embodiment of the present invention. As shown in fig. 8, the present embodiment also provides a control apparatus including: an obtaining module 81, configured to obtain an indoor ambient temperature and an indoor set temperature; a calculating module 82, configured to calculate a temperature difference between an indoor ambient temperature and an indoor set temperature; the control module 83 controls the operation states of the air conditioner 1 and the air returning device according to the temperature difference and the preset operation mode of the air conditioner 1. The control device can obtain the temperature adjusting effect of the air conditioner 1 to the air conditioning room at present according to the temperature difference between the indoor environment temperature and the indoor set temperature, and correspondingly controls and adjusts the switch, the running frequency and the like of the air conditioner 1, so that the air conditioning room can quickly reach the indoor set temperature and is maintained in the range near the indoor set temperature at low frequency, and on the basis of ensuring the use comfort of a user, the power consumption of the air conditioner can be saved, and the electric energy consumption is reduced; in addition, the on-off state of the air returning device is controlled through the temperature adjusting effect of the current air conditioner on the air conditioning room, so that waste heat in the air conditioning room can be effectively utilized, and the temperature adjusting energy efficiency of the air conditioner 1 is effectively improved through adjusting the pressure of the system on the side of the outer machine heat exchanger 141 by indoor air.
The embodiment also provides an air conditioning system which can execute the control method. The air conditioning system has all the technical effects of the control method, and the details are not repeated here.
Alternatively, as shown in fig. 9, the air conditioning system may include an air conditioner 1 and an air returning device 2, an air inlet end of the air returning device 2 is used for communicating with an indoor environment, an air outlet end of the air returning device 2 is used for communicating with an outdoor environment, and an external machine heat exchanger 141 of the air conditioner 1 is located in an air outlet area of the air outlet end. When the air conditioning system is used, the indoor unit is located inside the air conditioning room 4, the outdoor unit is located outside the air conditioning room 4, the air inlet end of the air returning device 2 is communicated with the indoor environment of the air conditioning room 4, the air outlet end of the air returning device 2 is located in the outdoor environment outside the air conditioning room 4, and gas sprayed out of the air outlet end can be sprayed onto the outdoor unit heat exchanger 141 of the outdoor unit 14.
Specifically, when the air conditioner executes a cooling mode, the indoor unit cools the interior of the air conditioning room, the outdoor unit dissipates heat to the outdoor environment, and the air temperature in the air conditioning room is lower than that of the outdoor environment; the air return device is opened, low-temperature air in the air-conditioning room is conveyed to the air outlet end of the air return device and is sprayed to the outer machine heat exchanger 141 of the outdoor machine through the air outlet end, so that the air inlet temperature of the outdoor machine is reduced, the condensing pressure of the outdoor machine and the evaporating pressure of the indoor machine are correspondingly reduced, the heat exchange quantity of the indoor machine and the indoor environment is improved, the refrigerating effect of the indoor machine in the air-conditioning room is improved, the speed of reaching comfortable temperature in the air-conditioning room is increased, and further the practicability of an air-conditioning system and the use comfort of a user are.
Similarly, when the air conditioner 1 performs the heating mode, the indoor unit performs the heating operation in the air-conditioned room, the outdoor unit absorbs the heat of the outdoor environment, and the air temperature in the air-conditioned room is higher than that of the outdoor environment; the air return device is opened, high-temperature air in the air-conditioning room is conveyed to the air outlet end of the air return device, and is sprayed to the outer machine heat exchanger 141 of the outdoor machine through the air outlet end, so that the air inlet temperature of the outdoor machine is increased, the low pressure of a corresponding lifting system is increased, the heating effect of the indoor machine in the air-conditioning room is improved, the speed of reaching comfortable temperature in the air-conditioning room is increased, and the practicability of the air conditioner and the use comfort of a user are improved.
In addition, when a fresh air device is installed at the indoor unit of the air conditioner 1, the fresh air device continuously conveys outdoor air into the air-conditioned room when in operation, so that the freshness of the air in the air-conditioned room is improved, and the comfort of users is improved; along with the continuous input of outdoor air, the air pressure in the air-conditioning room increases, and the air return device is opened, and the air return device can return partial air in the air-conditioning room to the outdoor environment, and on the basis of adjusting the air pressure in the air-conditioning room, the cold energy or the heat energy of redundant air can be recycled, so that the temperature adjusting effect of the air conditioner on the air-conditioning room is improved, and the use comfort of a user is further improved.
Specifically, as shown in fig. 9, the air returning device may include a return air pipe 23, and a driving member 24 for driving the indoor air to flow to the outdoor environment through the return air pipe is installed on the return air pipe 23. Specifically, the driving member 24 may be a fan. When the air conditioner is used, the air inlet end of the air return pipe is located in the air conditioning room, the air outlet end of the air return pipe is located at the position of the external machine heat exchanger 141, the fan is started, the fan can drive air in the air conditioning room to flow into the air return pipe through the air inlet end, and the air is accelerated by the fan and then discharged to the external machine heat exchanger 141 through the air outlet end of the air return pipe to exchange heat with the external machine heat exchanger 141.
In this embodiment, as shown in fig. 9, a filter assembly 21 may be provided at the air intake end of the air return device. In the in-process of return air device operation, the air in the air conditioner room at first need can get into in the return air pipe through the filtration of filter assembly 21, and filter assembly 21 can separate the fender to the impurity of indoor environment to reduce in impurity gets into the return air pipe and lead to the fact the jam to return air pipe or driving piece, influence the emergence of return air device in service behavior.
Specifically, in the present embodiment, as shown in fig. 12, the filter assembly 21 may include a return air box 211, and the return air box 211 is provided with a return air hole 212; the air intake end of the air returning device 2 communicates with the air returning case 211. During operation, air in the air-conditioning room 4 can enter the air return box 211 through the single air return hole 212 with a small circulation area, and then flows into the air return pipe 23 through the air inlet end; the panel in which the return air hole 212 is provided functions as a filtering barrier for foreign substances.
Alternatively, in this embodiment, as shown in fig. 9 to 11, the ejector 22 may be disposed at the air outlet end of the air returning device 2, where the ejector 22 includes an ejector pipe 221, and the ejector pipe 221 is provided with a plurality of air injection holes distributed in a dispersed manner. When the air returning device 2 operates, indoor air reaching the air outlet end enters the ejector 22 and is dispersedly ejected through the plurality of air ejecting holes, the ejected air is shunted, the air outlet area is enlarged, the heat exchange area between the ejected air and the outer machine heat exchanger 141 is correspondingly enlarged, and the heat exchange efficiency between the outer machine heat exchanger 141 and the ejected air is improved; in addition, when the area of giving vent to anger of the end of giving vent to anger of air return device 2 increases, the velocity of flow of blowout gas reduces, and the contact time of blowout gas and outer quick-witted heat exchanger 141 increases, and both heat exchange efficiency further improves.
Alternatively, in this embodiment, the ejector 22 may be connected to the outdoor unit 14 of the air conditioner 1 with the air injection holes all facing the outdoor unit heat exchanger 141. On one hand, the ejector 22 is connected with the outdoor unit 14, so that the accuracy of the relative position of the ejector 22 and the outdoor unit can be improved, and the phenomenon that the exhaust gas area exceeds the range of the outdoor unit heat exchanger 141 due to slippage of the ejector 22 and the waste heat utilization condition cannot be caused is effectively reduced; on the other hand, the air outlet areas of all the air injection holes on the ejector 22 are located in the outer machine heat exchanger 141, so that all the outputted indoor air can exchange heat with the outer machine heat exchanger 141, and the effective utilization of the indoor air waste heat is ensured. Specifically, as shown in fig. 10, the injection pipe 221 of the ejector 22 may be detachably fixed to the casing of the outdoor unit 14 or the outdoor unit heat exchanger 141 by a snap 17, as shown in fig. 2, the injection pipe 221 is a straight pipe, two snap 17 may be installed on the outdoor unit heat exchanger 141, and the two snap 17 fix the positions of both ends of the injection pipe 221, respectively, so as to firmly fix the injection pipe 221 to the outdoor unit heat exchanger 141.
Specifically, in this embodiment, the number of the gas injection holes may be at least two, and each row of the gas injection holes is arranged along the axial direction of the injection pipe. The air injection holes are a specific arrangement form, indoor air entering the injection pipe can be injected through the air injection holes in multiple rows, and injected air extends along the axial direction of the injection pipe; in addition, multirow fumaroles are arranged along the circumference interval of injection pipe, and the gaseous angle of each row of fumarole blowout is different, and the corresponding scope of giving vent to anger that further increases the sprayer increases the heat transfer area of blowout gas and outer quick-witted heat exchanger 141, improves outer quick-witted heat exchanger 141 and the gaseous heat exchange efficiency of blowout, and then further improves the temperature regulation effect of air conditioner to the air conditioning room. As shown in fig. 11, two rows of gas injection holes are formed in the injection pipe 221, one row is a first gas injection hole 222, the other row is a second gas injection hole 223, and the two rows of gas injection holes are arranged at intervals along the circumferential direction of the injection pipe 221 and both inject gas toward the outer machine heat exchanger 141.
Optionally, in this embodiment, when the air conditioning system is in operation, the air inlet end of the air returning device may be lower than the air outlet of the indoor unit of the air conditioner 1. The indoor unit is generally arranged at the high position of the air-conditioned room, the indoor unit blows the refrigerated or heated gas into the air-conditioned room from the high position, the air inlet end of the air return device is positioned in the air-conditioned room and is lower than the air outlet of the indoor unit, the indoor air in the lower area of the indoor unit can be sucked to the outside, and the indoor unit and the air return device jointly act to form airflow circulation in the air-conditioned room, so that the uniformity of the air temperature in the air-conditioned room is improved, and the use comfort of a user is correspondingly improved; the air conditioner in winter has a good heating mode effect, and can effectively solve the problem that hot air blown out by the indoor unit is retained at a high place and cannot fall to the ground, so that the indoor unit in the air-conditioned room is warm up and cool down.
Specifically, the air inlet end of the air return device can be arranged at the bed head of the air-conditioned room, the back of the sofa, a desk and a chair leaning against the wall and the like, so that the indoor space is saved and the indoor cleanliness is not influenced; preferably, the air inlet end of the air return device can be connected with the open shoe cabinet, so that on the basis of realizing waste heat utilization, the air circulation in the shoe cabinet can be accelerated, and the peculiar smell and the moisture of the shoe cabinet are reduced.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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 identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (13)
1. A control method, comprising:
acquiring the temperature difference between the indoor environment temperature and the indoor set temperature;
controlling the running states of the air conditioner (1) and the air return device (2) according to the temperature difference and a preset working mode of the air conditioner (1);
the air return device (2) is used for conveying indoor air to an external machine heat exchanger (141) of the air conditioner (1).
2. The method according to claim 1, wherein when the preset operation mode is a cooling mode, the step of controlling the operation states of the air conditioner (1) and the air returning device (2) according to the temperature difference and the preset operation mode of the air conditioner (1) comprises:
if the temperature difference is greater than a first temperature threshold value, controlling the air conditioner (1) to increase the frequency to operate, and controlling the air return device (2) to be in an open state, wherein the first temperature threshold value is greater than zero;
if the temperature difference is smaller than or equal to the first temperature threshold and larger than or equal to the second temperature threshold, controlling the air conditioner (1) to operate at a reduced frequency, and controlling the air return device (2) to be in a closed state, wherein the second temperature threshold is smaller than zero;
and if the temperature difference is smaller than the second temperature threshold value, controlling the air conditioner (1) to stop and controlling the air return device (2) to be in a closed state.
3. The method according to claim 1, wherein when the preset operation mode is a heating mode, the step of controlling the operation states of the air conditioner (1) and the air returning device (2) according to the temperature difference and the preset operation mode of the air conditioner (1) comprises:
if the temperature difference is greater than the third temperature threshold, controlling the air conditioner (1) to stop and controlling the air return device (2) to be in a closed state, wherein the third temperature threshold is greater than zero;
if the temperature difference is smaller than or equal to the third temperature threshold and larger than or equal to the fourth temperature threshold, controlling the air conditioner (1) to reduce the frequency for operation, and controlling the air return device (2) to be in a closed state, wherein the fourth temperature threshold is smaller than zero;
and if the temperature difference is smaller than the fourth temperature threshold value, controlling the air conditioner (1) to increase the frequency to operate, and controlling the air return device (2) to be in an open state.
4. The control method according to claim 1, wherein the air conditioner (1) performs a heating mode, including:
acquiring the temperature of an outer machine heat exchanger and the set temperature of an outer machine;
judging whether the temperature of the heat exchanger of the external machine is greater than or equal to the set temperature of the external machine or not;
if yes, controlling the running states of the air conditioner (1) and the air return device (2) according to the temperature difference and a preset working mode of the air conditioner (1);
if not, the air conditioner (1) is controlled to enter a defrosting mode, and the air return device (2) is controlled to be in a closed state.
5. The control method according to any one of claims 1 to 4, characterized in that when the fresh air device (3) and the return air device (2) of the air conditioner (1) are both in an on state, the return air amount of the return air device (2) is controlled to be smaller than the supply air amount of the fresh air device (3).
6. A control device, comprising:
the acquisition module (81) is used for acquiring indoor environment temperature and indoor set temperature;
a calculation module (82) for calculating a temperature difference between the indoor ambient temperature and the indoor set temperature;
and the control module (83) controls the running states of the air conditioner (1) and the air return device (2) according to the temperature difference and the preset working mode of the air conditioner (1).
7. An air conditioning system characterized by being capable of executing the control method of any one of claims 1 to 5.
8. The air conditioning system according to claim 7, characterized by comprising an air conditioner (1) and an air return device (2), wherein an air inlet end of the air return device (2) is used for being communicated with an indoor environment, an air outlet end of the air return device (2) is used for being communicated with an outdoor environment, and an external machine heat exchanger (141) of the air conditioner (1) is located in an air outlet area of the air outlet end.
9. Air conditioning system according to claim 8, characterized in that the inlet end is provided with a filter assembly (21).
10. The air conditioning system of claim 8, wherein the air outlet end is provided with an ejector (22), the ejector (22) comprises an ejector pipe (221), and the ejector pipe (221) is provided with a plurality of air injection holes which are distributed in a dispersed manner.
11. The air conditioning system as claimed in claim 10, wherein the ejector (22) is connected to an outdoor unit (14) of the air conditioner (1), and the air injection holes are directed toward the outdoor unit heat exchanger (141).
12. The air conditioning system of claim 11, wherein the air injection holes are arranged in at least two rows, and each row of the air injection holes is arranged along an axial direction of the injection pipe (221).
13. Air conditioning system according to any of claims 8 to 12, characterized in that, when the air conditioning system is in operation, the air inlet end is lower than the air outlet of the indoor unit (13) of the air conditioner (1).
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