CN113188265B - Air conditioner cold air prevention control system and method and air conditioner - Google Patents
Air conditioner cold air prevention control system and method and air conditioner Download PDFInfo
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- CN113188265B CN113188265B CN202110401996.7A CN202110401996A CN113188265B CN 113188265 B CN113188265 B CN 113188265B CN 202110401996 A CN202110401996 A CN 202110401996A CN 113188265 B CN113188265 B CN 113188265B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
- F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
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Abstract
The invention provides an air conditioner cold air prevention control system, an air conditioner cold air prevention control method and an air conditioner, wherein the system comprises: the system comprises an outdoor heat exchanger, a main path throttling device, an indoor heat exchanger, a branch throttling device and a refrigerant mixer; the outdoor heat exchanger, the main path throttling device and the indoor heat exchanger are sequentially connected in series to form a main path pipeline, and the branch throttling device and the refrigerant mixer are connected in series to form a branch pipeline; the branch throttling device is arranged between the outdoor heat exchanger and the indoor heat exchanger, and the refrigerant mixer is arranged between the main throttling device and the indoor heat exchanger. According to the invention, the high-temperature gaseous refrigerant output by the indoor heat exchanger is converted into the high-temperature liquid refrigerant through the branch throttling device, so that the high-temperature liquid refrigerant flows into the refrigerant mixer and is mixed with the low-temperature liquid refrigerant to obtain the mixed liquid refrigerant with higher temperature, and the temperature of the inner disc of the indoor heat exchanger is increased when the mixed liquid refrigerant flows through the indoor heat exchanger, so that the temperature of the inner disc can reach the temperature required by air conditioner heating more quickly, and the cold air prevention time is shortened.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner cold air prevention control system and method and an air conditioner.
Background
In the air conditioner heating process, because outdoor condenser frosts excessively thickly and can influence its ability of heating, automatic defrosting when consequently having set up condenser frost layer thickly (outer coil pipe temperature crosses when low excessively), but the interior coil pipe temperature of indoor evaporimeter often crosses lowly after the defrosting, needs to heat and moves the certain time, treats that the evaporimeter temperature rises to a definite value, just starts interior fan and progressively improves the fan rotational speed and normally heats, avoids blowing out cold wind and influences human travelling comfort. The time that the inner fan after defrosting is shut down and the low rotational speed is called as the cold air prevention stage, and when the time of the cold air prevention stage is too long, the condition that the air is not heated for a long time can appear, and the use experience of a user is influenced.
Disclosure of Invention
The invention provides an air conditioner cold air prevention control system and method and an air conditioner, which are used for solving the defect that air conditioner cold air prevention time is too long in the prior art.
The invention provides a cold air prevention control system of an air conditioner, which comprises:
the main path pipeline comprises an outdoor heat exchanger, a main path throttling device and an indoor heat exchanger which are sequentially connected in series;
the branch pipeline comprises a branch throttling device and a refrigerant mixer which are connected in series; the branch throttling device is arranged between the outdoor heat exchanger and the indoor heat exchanger, and the refrigerant mixer is arranged between the main throttling device and the indoor heat exchanger.
According to the air conditioner cold air prevention control system provided by the invention, the main path throttling device comprises an electronic expansion valve, the branch path throttling device is an electronic expansion valve, and a plurality of guide plates are arranged in the refrigerant mixer.
According to the air conditioner cold air prevention control system provided by the invention, the ratio of the cross-sectional area of the pipeline corresponding to the branch pipeline to the cross-sectional area of the pipeline corresponding to the main pipeline is not more than a preset value.
The invention also provides a cold air prevention control method of the air conditioner, which comprises the following steps:
when the air conditioner is in a reverse circulation defrosting mode and the temperature of the outer disc is between a first temperature threshold and a second temperature threshold, starting the branch throttling device to convert high-temperature gaseous refrigerants output by the indoor heat exchanger into high-temperature liquid refrigerants and enable the high-temperature liquid refrigerants to flow into the refrigerant mixer; the first temperature threshold is less than the second temperature threshold;
the refrigerant mixer mixes the low-temperature liquid refrigerant and the high-temperature liquid refrigerant to obtain a mixed liquid refrigerant; the temperature of the mixed liquid refrigerant is higher than that of the low-temperature liquid refrigerant, and the low-temperature liquid refrigerant refers to the refrigerant flowing through the outdoor heat exchanger after defrosting.
The cold air prevention control method of the air conditioner provided by the invention further comprises the following steps:
operating an electric heater of the air conditioner at a first preset power, and reversing an inner fan of the air conditioner at a mute wind shield;
if the temperature of the inner disc of the indoor heat exchanger is less than or equal to a third temperature threshold, adjusting the opening of the branch throttling device based on the temperature rising rate of the inner disc of the indoor heat exchanger so that the mixed liquid refrigerant meeting the flow requirement flows through the indoor heat exchanger, and turning off the electric heater, the inner fan and the branch throttling device until the temperature of the inner disc is greater than or equal to a fourth temperature threshold within a preset time period; the first temperature threshold, the second temperature threshold, the third temperature threshold, and the fourth temperature threshold are sequentially increased in number.
According to the cold air prevention control method for the air conditioner, provided by the invention, the adjusting of the opening degree of the branch throttling device based on the temperature rising rate of the inner disc of the indoor heat exchanger comprises the following steps:
if the temperature rise rate of the inner disc is less than the first temperature rise rate, the opening degree of the branch throttling device is increased, and the mute wind gear is adjusted to be a low wind gear;
if the temperature rising rate of the inner disc is greater than or equal to a first temperature rising rate and smaller than a second temperature rising rate, keeping the current opening degree of the branch throttling device;
and if the temperature rise rate of the inner disc is greater than or equal to a second temperature rise rate, reducing the opening degree of the branch throttling device.
The cold air prevention control method for the air conditioner further comprises the following steps:
if the temperature of the inner disc is between the third temperature threshold and the fourth temperature threshold, determining whether the temperature of the inner ring of the air conditioner is greater than or equal to a target temperature threshold, and if so, adjusting the mute wind level to be a low wind level; the target temperature threshold is determined based on the inner disc temperature after defrosting is finished.
The cold air prevention control method of the air conditioner provided by the invention further comprises the following steps:
if the air conditioner is in a heating mode and the temperature of the outer disc is smaller than an initial temperature threshold value, starting a reverse circulation defrosting mode of the air conditioner; the initial temperature threshold is less than the first temperature threshold.
According to the method for controlling the cold air prevention of the air conditioner, after the reverse circulation defrosting mode of the air conditioner is started, the method further comprises the following steps:
and if the temperature of the outer disc is smaller than the first temperature threshold value, operating the electric heater of the air conditioner at a second preset power, and reversing the inner fan of the air conditioner at a low wind level.
The present invention also provides an air conditioner including: the air conditioner cold air prevention control system is described above.
According to the air conditioner cold air prevention control system, the air conditioner cold air prevention control method and the air conditioner, when the air conditioner is in a reverse circulation defrosting mode and the temperature of an outer disc of the air conditioner is between a first temperature threshold and a second temperature threshold, the branch throttling device is started, high-temperature gaseous refrigerants output by the indoor heat exchanger are converted into high-temperature liquid refrigerants, so that the high-temperature liquid refrigerants flow into the refrigerant mixer and are mixed with low-temperature liquid refrigerants, mixed liquid refrigerants with higher temperature are obtained, the temperature of the inner disc of the indoor heat exchanger is increased when the mixed liquid refrigerants flow through the indoor heat exchanger, the temperature of the inner disc can reach the temperature required by heating of the air conditioner more quickly, and cold air prevention time is shortened. Meanwhile, the branch formed by the branch throttling device and the refrigerant mixer is simple in structure and low in cost.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an air conditioner cold air prevention control system provided by the invention;
FIG. 2 is a schematic flow chart of a method for controlling cold air resistance of an air conditioner according to the present invention;
FIG. 3 is a second schematic flow chart of the method for controlling the anti-cold wind of the air conditioner according to the present invention;
reference numerals:
110: an outdoor heat exchanger; 120: a main road throttling device; 130: an indoor heat exchanger;
140: a branch throttling device; 150: a refrigerant mixer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
In the air conditioner heating process, because outdoor condenser frosts excessively thickly and can influence its ability of heating, automatic defrosting when consequently having set up condenser frost layer thickly (outer coil pipe temperature crosses when low excessively), but the interior coil pipe temperature of indoor evaporimeter often crosses lowly after the defrosting, needs to heat and moves the certain time, treats that the evaporimeter temperature rises to a definite value, just starts interior fan and progressively improves the fan rotational speed and normally heats, avoids blowing out cold wind and influences human travelling comfort. The time that the inner fan after defrosting is shut down and the low rotational speed is called as the cold air prevention stage, and when the time of the cold air prevention stage is too long, the condition that the air is not heated for a long time can appear, and the use experience of a user is influenced.
Accordingly, the invention provides a cold air prevention control system of an air conditioner. Fig. 1 is a schematic structural diagram of an air conditioner cold air prevention control system provided by the present invention, and as shown in fig. 1, the system includes: the main path pipeline comprises an outdoor heat exchanger 110, a main path throttling device 120 and an indoor heat exchanger 130 which are sequentially connected in series, and the branch path pipeline comprises a branch throttling device 140 and a refrigerant mixer 150 which are connected in series; the branch throttle device 140 is disposed between the outdoor heat exchanger 110 and the indoor heat exchanger 130, and the refrigerant mixer 150 is disposed between the main throttle device 120 and the indoor heat exchanger 130. The main throttle 120 and the branch throttle 140 may be expansion valves, such as electronic expansion valves, thermal expansion valves, etc.
When the air conditioner is in a heating mode and the reverse circulation defrosting is started, if the temperature T of the outer disc of the air conditioner is detected at the moment Outer plate At a first temperature threshold T 1 And a second temperature threshold T 2 In between, i.e. T 1 ≤T Outer plate ≤T 2 When the temperature of the external coil is lower, the air conditioner can automatically defrostThe temperature of the inner coil pipe is prevented from being too low after defrosting is finished, and at the moment, the branch throttling device 140 needs to be opened to convert the high-temperature gaseous refrigerant output by the indoor heat exchanger 130 into the high-temperature liquid refrigerant so that the high-temperature liquid refrigerant flows into the refrigerant mixer 150; the first temperature threshold is smaller than the second temperature threshold, and the first temperature threshold and the second temperature threshold may be set according to specific situations, for example, the first temperature threshold T may be set 1 10 deg.C, second temperature threshold T 2 ＝T 1 +5℃。
Because the low-temperature liquid refrigerant flowing through the outdoor heat exchanger after defrosting also flows into the refrigerant mixer 150, the refrigerant mixer 150 can mix the low-temperature liquid refrigerant and the high-temperature liquid refrigerant, and simultaneously, because the temperature of the high-temperature liquid refrigerant is higher than that of the low-temperature liquid refrigerant, the temperature of the obtained mixed liquid refrigerant can be higher than that of the low-temperature liquid refrigerant, and further the mixed liquid refrigerant can enable the temperature of an inner disc of the indoor heat exchanger 130 to be increased to the heating required temperature at a higher speed when flowing through the indoor heat exchanger 130, thereby shortening the cold-proof time, and enabling the air conditioner to start the heating mode at a higher speed. Compared with the conventional method in which a low-temperature liquid refrigerant with a relatively low temperature directly flows through the indoor heat exchanger 130, the inner pan of the indoor heat exchanger 130 needs a relatively long time to reach the heating required temperature, thereby increasing the cold air prevention time.
According to the air conditioner cold air prevention control system provided by the embodiment of the invention, when the air conditioner is in a reverse circulation defrosting mode and the temperature of the outer disc of the air conditioner is between the first temperature threshold and the second temperature threshold, the branch throttling device is started, the high-temperature gaseous refrigerant output by the indoor heat exchanger is converted into the high-temperature liquid refrigerant, so that the high-temperature liquid refrigerant flows into the refrigerant mixer and is mixed with the low-temperature liquid refrigerant, a mixed liquid refrigerant with higher temperature is obtained, the temperature of the inner disc of the indoor heat exchanger is increased when the mixed liquid refrigerant flows through the indoor heat exchanger, the temperature of the inner disc can reach the temperature required by heating of the air conditioner more quickly, and the cold air prevention time is shortened. Meanwhile, the branch formed by the branch throttling device and the refrigerant mixer is simple in structure and low in cost.
Based on the above embodiment, the main throttling device 120 includes an electronic expansion valve, the branch throttling device 140 is an electronic expansion valve, and a plurality of flow deflectors are disposed in the refrigerant mixer 150.
Specifically, the electronic expansion valve can control the voltage or current applied to the expansion valve by using the electric signal generated by the adjusted parameter, thereby achieving the purpose of adjusting the liquid supply amount. The electronic expansion valve has higher adjustment sensitivity than a traditional throttling device (such as a thermal expansion valve). In addition, the refrigerant mixer 150 may be a cylindrical tank, and a plurality of flow guide plates are arranged inside the tank in an inner-crossing manner, so that after the low-temperature liquid refrigerant and the high-temperature liquid refrigerant are sufficiently mixed, the mixed liquid refrigerant with a higher temperature flows through the indoor heat exchanger, and the temperature of the inner disc of the indoor heat exchanger is increased.
Based on any of the above embodiments, the ratio of the cross-sectional area of the pipeline corresponding to the branch pipeline to the cross-sectional area of the pipeline corresponding to the main pipeline is not greater than the preset value.
Specifically, the outdoor heat exchanger 110, the main path throttling device 120, and the indoor heat exchanger 130 are sequentially connected in series to form a main path pipeline, and the branch throttling device 140 and the refrigerant mixer 150 are connected in series to form a branch pipeline. The cross-sectional area S1 of the branch line and the cross-sectional area S2 of the main line have the following relationship: S1/S2 is less than or equal to S (wherein S can be set according to specific conditions, such as S1/3), so that the defrosting effect of the outdoor heat exchanger can be prevented from being influenced when the branch throttling device 140 is fully opened.
Based on any one of the above embodiments, the present invention provides a method for controlling cold air prevention of an air conditioner based on the system for controlling cold air prevention of an air conditioner according to any one of the above embodiments, as shown in fig. 2, the method includes the following steps:
Specifically, when the air conditioner is in a heating mode and reverse circulation defrosting is started, if the temperature T of the outer disc of the air conditioner is detected at the time Outer plate At a first temperature threshold T 1 And a second temperature threshold T 2 In between, i.e. T 1 ≤T Outer plate ≤T 2 When the temperature of the outer coil pipe is lower, the air conditioner can automatically defrost, and in order to avoid the condition that the temperature of the inner coil pipe is too low after defrosting is finished, the branch throttling device needs to be opened, high-temperature gaseous refrigerant output by the indoor heat exchanger is converted into high-temperature liquid refrigerant, and the high-temperature liquid refrigerant flows into the refrigerant mixer; the first temperature threshold is smaller than the second temperature threshold, and the first temperature threshold and the second temperature threshold may be set according to specific situations, for example, the first temperature threshold T may be set 1 10 deg.C, second temperature threshold T 2 ＝T 1 +5℃。
Because the low temperature liquid refrigerant that flows through outdoor heat exchanger after the defrosting also can flow into the refrigerant mixer, thereby the refrigerant mixer can mix low temperature liquid refrigerant and high temperature liquid refrigerant, simultaneously because the temperature of high temperature liquid refrigerant is higher than the temperature of low temperature liquid refrigerant, thereby the temperature of the mixed liquid refrigerant that obtains can be higher than the temperature of low temperature liquid refrigerant, and then mixed liquid refrigerant can make the inner disc temperature of indoor heat exchanger rise to the requirement temperature of heating with faster when flowing through indoor heat exchanger, shorten cold wind prevention time, make the air conditioner can start the mode of heating with faster. Compared with the traditional method in which the low-temperature liquid refrigerant with lower temperature directly flows through the indoor heat exchanger, the inner disc of the indoor heat exchanger needs longer time to reach the heating required temperature, thereby increasing the cold air prevention time.
Based on any embodiment above, still include:
operating an electric heater of the air conditioner at a first preset power, and reversing an inner fan of the air conditioner at a mute air damper;
if the temperature of the inner disc of the indoor heat exchanger is less than or equal to the third temperature threshold, adjusting the opening of the branch throttling device based on the temperature rising rate of the inner disc of the indoor heat exchanger so that the mixed liquid refrigerant meeting the flow requirement flows through the indoor heat exchanger, and turning off the electric heater, the inner fan and the branch throttling device until the temperature of the inner disc is greater than or equal to the fourth temperature threshold within a preset time period; the first temperature threshold, the second temperature threshold, the third temperature threshold and the fourth temperature threshold are sequentially increased in number.
Specifically, according to the embodiment of the invention, after the branch throttling device is started, the electric heater of the air conditioner is operated at the first preset power (such as 0.5P), so that the electric heater can heat the refrigerant flowing through the indoor heat exchanger, the temperature rise rate of the inner plate temperature pair is increased, and the cold air prevention time is further shortened. And meanwhile, the inner fan of the air conditioner is reversely rotated by the mute wind shield, so that the air conditioner keeps a reverse circulation defrosting mode.
The opening degree of the branch throttling device influences the flow rate of the mixed liquid refrigerant, the larger the opening degree is, the larger the flow rate is, and if the flow rate is overlarge, the defrosting effect of the outdoor heat exchanger is influenced; if the flow rate is too small, the rate of temperature rise of the inner disk is affected. Therefore, if the temperature of the inner disc of the indoor heat exchanger is less than or equal to the third temperature threshold T 3 The opening degree of the branch throttling device needs to be adjusted based on the inner disc heating rate of the indoor heat exchanger, so that the mixed liquid refrigerant meeting the flow requirement flows through the indoor heat exchanger until the temperature of the inner disc is greater than or equal to the fourth temperature threshold value T within the preset time length 4 When (if the temperature of the inner disc is more than or equal to T) 4 And continuing for 30s), closing the electric heater, the inner fan and the branch throttling device, enabling all high-temperature refrigerants to pass through the outdoor heat exchanger, and quickly finishing the defrosting process (if T is detected in the defrosting process in the process) Inner disc Is reduced to T again 4 Below, the electric heating is started, and the inner fan and the branch throttling device are closed); the first temperature threshold, the second temperature threshold, the third temperature threshold and the fourth temperature threshold are sequentially increased in number, the third temperature threshold and the fourth temperature can be set according to specific conditions, for example, the fourth temperature threshold is set to be T 4 24 ℃, third temperature threshold T 3 ＝T 4 -8℃。
If T is shown in FIG. 3 1 ≤T Outer plate ＜T 2 If the temperature of the electronic expansion valve is not the first time, the corresponding opening degree of the electronic expansion valve is maintained, the temperature of the inner disc is detected in real time, and the opening degree of the electronic expansion valve is adjusted according to the temperature of the inner disc.
Based on any one of the above-mentioned embodiments, the aperture of adjusting branch throttle device based on the inner pan rate of temperature rise of indoor heat exchanger includes:
if the temperature rise rate of the inner disc is less than the first temperature rise rate, the opening degree of the branch throttling device is increased, and the mute wind gear is adjusted to be a low wind gear;
if the temperature rising rate of the inner disc is greater than or equal to the first temperature rising rate and smaller than the second temperature rising rate, keeping the current opening degree of the branch throttling device;
and if the temperature rise rate of the inner disc is greater than or equal to the second temperature rise rate, reducing the opening degree of the branch throttling device.
Specifically, if the temperature rise rate of the inner disc is smaller than the first temperature rise rate, it is indicated that the temperature rise rate of the inner disc is too small, that is, the flow rate of the mixed liquid refrigerant is too small, and the opening degree of the branch throttling device needs to be increased to increase the flow rate, so that the temperature rise rate of the inner disc is increased. If the temperature rise rate of the inner disc is greater than or equal to the first temperature rise rate and smaller than the second temperature rise rate, the temperature rise rate of the inner disc meets the requirement, and the current opening degree of the branch throttling device can be kept. If the temperature rise rate of the inner disc is larger than or equal to the second temperature rise rate, the temperature rise rate of the inner disc is over large, namely the flow of the mixed liquid refrigerant is over large, the opening degree of the branch throttling device needs to be reduced to reduce the flow, and the defrosting effect of the outdoor heat exchanger is prevented from being influenced.
As shown in fig. 3, taking the branch throttling device as an electronic expansion valve as an example, when T is Inner disc ≤T 3 If the temperature rise rate Delta T of the inner disk in unit time Inner disc If Δ Ta is less than Δ Ta, the valve opening degree of the electronic expansion valve is increased at an interval of Δ M ═ 5 (up to M ═ MMAX, MMAX is the maximum valve opening degree, and the valve opening degree of the electronic expansion valve is adjustable within a range of 0.1MMAX to MMAXKeeping the opening of the MMAX valve unchanged), and simultaneously converting the reverse wind speed of the inner fan into a low wind gear to increase the temperature rise rate of the inner disc; if Δ Ta is less than or equal to Δ T Inner disc If the air speed is less than delta Tb, keeping the current valve opening of the electronic expansion valve unchanged, and keeping the reverse air speed of the inner fan at a mute air gear; if Δ T Inner disc And if the temperature of the refrigerant is larger than or equal to Δ Tb, the electronic expansion valve decreases the valve opening at an interval of Δ M ═ 5 (the minimum value is decreased to M ═ 0.1MMAX, and the valve opening is kept unchanged thereafter), so that the frost melting effect of the outdoor heat exchanger is prevented from being influenced by the excessive high-temperature refrigerant flowing through the bypass branch.
Based on any embodiment above, still include:
if the temperature of the inner ring is between the third temperature threshold and the fourth temperature threshold, determining whether the temperature of the inner ring of the air conditioner is greater than or equal to the target temperature threshold, and if so, adjusting the mute wind level to be a low wind level; the target temperature threshold is determined based on the inner panel temperature after the end of defrosting.
Specifically, if the inner disc temperature is between the third temperature threshold and the fourth temperature threshold, it indicates that the current opening degree of the branch throttling device meets the requirement, the current opening degree can be kept unchanged, and if the inner ring temperature of the air conditioner is greater than or equal to the target temperature threshold, it indicates that the heat convection between the indoor heat exchanger and the indoor hot air needs to be accelerated so as to be capable of increasing the inner disc temperature more quickly, so that the mute air damper is adjusted to be a low air damper, otherwise, the mute air damper is still kept. Wherein, the inner ring temperature refers to the temperature of the surface of the core of the indoor heat exchanger, the target temperature threshold is determined based on the temperature of the inner disc after defrosting is finished, and the target temperature threshold can be T Target -ΔT，T Target Indicating the temperature after the end of defrosting, Δ T may be set as the case may be, e.g., 3.0 ℃.
When T is shown in FIG. 3 3 ＜T Inner disc ＜T 4 When the temperature of the inner ring is T, the opening degree of the current valve of the electronic expansion valve is kept unchanged, and whether the temperature of the inner ring has T or not is judged simultaneously Inner ring ≥T Target If the temperature of the inner disk is higher than the preset temperature, the reverse wind speed of the inner fan is increased to a low wind level, the temperature of the inner disk is increased more quickly through the heat exchange of the indoor heat exchanger and the indoor hot air in a convection mode, otherwise, the mute wind level is kept until T is reached Inner disc ≥T 4 And lasts for 30 s;
based on any one of the above embodiments, the method further comprises:
if the air conditioner is in a heating mode and the temperature of the outer disc is smaller than the initial temperature threshold value, starting a reverse circulation defrosting mode of the air conditioner; the initial temperature threshold is less than the first temperature threshold.
Specifically, if the air conditioner is in the heating mode and the outer tray temperature is less than the initial temperature threshold T 0 If so, the air conditioner needs to enter a defrosting mode, namely, a reverse circulation defrosting mode of the air conditioner is started to defrost. Wherein the initial temperature threshold T 0 The threshold value is judged for the original defrosting state of the air conditioner system, and can be between 3 ℃ below zero and 10 ℃ below zero, and the initial temperature threshold value is smaller than the first temperature threshold value.
If T is shown in FIG. 3 Outer plate ≤T 0 If not, the air conditioner normally enters a reverse circulation defrosting state, and otherwise, the current heating mode is kept unchanged.
Therefore, according to the embodiment of the invention, the valve opening of the branch throttling device is adjusted, the electric heater and the inner fan are opened and closed according to the multiple control of the outer disc temperature, the inner ring temperature and the like, and the accuracy and timeliness of the regulation and control result are ensured; meanwhile, in the defrosting process of the air conditioner, the temperature of the outer disc reflects the defrosting completion degree, the temperature of the inner disc is controlled and promoted according to the defrosting completion degree, the temperature of the inner disc is higher when the defrosting is completed, the cold wind prevention time of the inner machine during heating is shortened, and the use comfort of a user is promoted.
Based on any embodiment above, still include:
and if the temperature of the outer disc is less than the first temperature threshold value, operating the electric heater of the air conditioner at a second preset power, and reversing the inner fan of the air conditioner at a low wind gear.
Specifically, when the air conditioner is in a reverse circulation defrosting mode, if the temperature of the outer disc is smaller than a first temperature threshold value, the electric heater of the air conditioner is operated at a second preset power, and the inner fan of the air conditioner is reversed at a low wind level, so that heat exchange between the electric heater and the indoor heat exchanger is realized, the return air temperature of the compressor is increased, the exhaust temperature of the compressor is indirectly increased, and the defrosting process is accelerated. Wherein, the second preset power is larger than the first preset power, if the first preset power is 0.5P, the second preset power is P, that is, the electric heater is started by full-tapping.
As shown in FIG. 3, during the reverse circulation defrosting period, if T Outer plate ＜T 1 (e.g. T) 1 10 ℃), the air conditioner starts the electric heater with full power P, the inner fan reverses with low wind level, so that the electric heater and the indoor evaporator realize heat exchange, the return air temperature of the compressor is raised, the exhaust temperature of the compressor is raised indirectly, and the defrosting process is accelerated.
Based on any embodiment, if the temperature of the outer disc is greater than or equal to the second temperature threshold, the electric heater, the inner fan and the branch throttling device are turned off, so that the air conditioner exits the reverse circulation defrosting mode and is turned on the heating mode.
If T is shown in FIG. 3 Outer plate ≥T 2 (T 2 A threshold value is judged for the original defrosting exiting state of the air conditioner system), the electric heating, the inner fan and the electronic expansion valve are closed, the air conditioner exits the reverse circulation defrosting state, and a normal heating mode is started.
Based on the above embodiments, the present invention provides an air conditioner, including: the cold air preventing control system of the air conditioner according to any one of the above embodiments.
Specifically, the air conditioner cold air prevention system adjusts the valve opening degree of the branch throttling device and opens and closes the electric heater and the inner fan according to multiple control of the outer disc temperature, the inner ring temperature and the like, so that the accuracy and timeliness of a regulation and control result are ensured; meanwhile, in the defrosting process of the air conditioner, the temperature of the outer disc reflects the defrosting completion degree, the temperature of the inner disc is controlled and promoted according to the defrosting completion degree, and the temperature of the inner disc is higher when the defrosting is completed, so that the air conditioner comprising the windproof system can shorten the cold wind prevention time of the inner unit during heating.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A cold air preventing control method of an air conditioner is characterized by comprising the following steps:
when the air conditioner is in a reverse circulation defrosting mode and the temperature of the outer disc is between a first temperature threshold and a second temperature threshold, the branch throttling device is started, so that high-temperature gaseous refrigerants output by the indoor heat exchanger flow into the refrigerant mixer; the first temperature threshold is less than the second temperature threshold;
the refrigerant mixer mixes the low-temperature liquid refrigerant and the high-temperature gaseous refrigerant to obtain a mixed liquid refrigerant; the temperature of the mixed liquid refrigerant is higher than that of the low-temperature liquid refrigerant, and the low-temperature liquid refrigerant refers to the refrigerant flowing through the outdoor heat exchanger after defrosting.
2. The method of controlling cool air prevention of an air conditioner according to claim 1, further comprising:
operating an electric heater of the air conditioner at a first preset power, and reversing an inner fan of the air conditioner at a mute wind shield;
if the temperature of the inner disc of the indoor heat exchanger is less than or equal to a third temperature threshold, adjusting the opening of the branch throttling device based on the temperature rising rate of the inner disc of the indoor heat exchanger so that the mixed liquid refrigerant meeting the flow requirement flows through the indoor heat exchanger, and turning off the electric heater, the inner fan and the branch throttling device until the temperature of the inner disc is greater than or equal to a fourth temperature threshold within a preset time period; the first temperature threshold, the second temperature threshold, the third temperature threshold, and the fourth temperature threshold are sequentially increased in number.
3. The method for controlling cold air prevention of an air conditioner according to claim 2, wherein the adjusting the opening degree of the branch throttling means based on the inner disc heating rate of the indoor heat exchanger comprises:
if the temperature rise rate of the inner disc is less than the first temperature rise rate, the opening degree of the branch throttling device is increased, and the mute wind gear is adjusted to be a low wind gear;
if the temperature rising rate of the inner disc is greater than or equal to a first temperature rising rate and smaller than a second temperature rising rate, keeping the current opening degree of the branch throttling device;
and if the temperature rise rate of the inner disc is greater than or equal to a second temperature rise rate, reducing the opening degree of the branch throttling device.
4. The method of controlling cool air prevention of an air conditioner according to claim 2, further comprising:
if the temperature of the inner disc is between the third temperature threshold and the fourth temperature threshold, determining whether the temperature of the inner ring of the air conditioner is greater than or equal to a target temperature threshold, and if so, adjusting the mute wind level to be a low wind level; the target temperature threshold is determined based on the inner pan temperature after defrosting is finished.
5. The method of controlling cool air prevention of an air conditioner according to claim 1, further comprising:
if the air conditioner is in a heating mode and the temperature of the outer disc is smaller than an initial temperature threshold value, starting a reverse circulation defrosting mode of the air conditioner; the initial temperature threshold is less than the first temperature threshold.
6. The air conditioner cold-wind prevention control method according to claim 5, further comprising:
and if the temperature of the outer disc is smaller than the first temperature threshold value, operating the electric heater of the air conditioner at a second preset power, and reversing the inner fan of the air conditioner at a low wind level.
7. The utility model provides an air conditioner anti-cold wind control system which characterized in that includes:
the main path pipeline comprises an outdoor heat exchanger, a main path throttling device and an indoor heat exchanger which are sequentially connected in series;
the branch pipeline comprises a branch throttling device and a refrigerant mixer which are connected in series; the branch throttling device is arranged between the outdoor heat exchanger and the indoor heat exchanger, and the refrigerant mixer is arranged between the main throttling device and the indoor heat exchanger;
the air conditioner cold air prevention system is used for executing the air conditioner cold air prevention control method of any one of claims 1 to 6.
8. The system as claimed in claim 7, wherein the main throttle means includes an electronic expansion valve, the branch throttle means includes an electronic expansion valve, and a plurality of guide plates are disposed in the refrigerant mixer.
9. The system as claimed in claim 7, wherein the ratio of the cross-sectional area of the pipeline corresponding to the branch pipeline to the cross-sectional area of the pipeline corresponding to the main pipeline is not greater than a predetermined value.
10. An air conditioner, comprising: the air conditioner cold wind prevention control system of any one of claims 7 to 9.
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| JPH11182994A (en) * | 1997-12-18 | 1999-07-06 | Toshiba Corp | Air conditioner |
| CN104344618B (en) * | 2013-07-30 | 2017-02-08 | 广东美的暖通设备有限公司 | Intelligent defrosting air conditioning system and control method thereof |
| CN106839344B (en) * | 2017-04-01 | 2019-12-06 | 青岛海尔空调器有限总公司 | air conditioner defrosting control method |
| CN107013977B (en) * | 2017-04-01 | 2020-11-03 | 青岛海尔空调器有限总公司 | Air conditioning system |
| CN107152819A (en) * | 2017-06-06 | 2017-09-12 | 青岛海尔空调器有限总公司 | Air-conditioning device and its control method |
| CN107152820B (en) * | 2017-06-19 | 2020-05-29 | 青岛海尔空调器有限总公司 | Air conditioner and control method thereof |
| CN110567183B (en) * | 2019-09-16 | 2021-03-09 | 珠海格力电器股份有限公司 | Air conditioner and defrosting control method thereof |
| CN110793156B (en) * | 2019-11-19 | 2021-12-14 | 宁波奥克斯电气股份有限公司 | Air conditioner heating over-temperature protection control method and device and air conditioner |
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