CN109405168B - Air conditioner and control method for preventing coil pipe temperature of indoor unit of air conditioner from being overhigh - Google Patents
Air conditioner and control method for preventing coil pipe temperature of indoor unit of air conditioner from being overhigh Download PDFInfo
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- CN109405168B CN109405168B CN201811051541.1A CN201811051541A CN109405168B CN 109405168 B CN109405168 B CN 109405168B CN 201811051541 A CN201811051541 A CN 201811051541A CN 109405168 B CN109405168 B CN 109405168B
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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
- F24F11/32—Responding to malfunctions or emergencies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Air Conditioning Control Device (AREA)
Abstract
The invention relates to an air conditioner and a control method for preventing the coil pipe temperature of an indoor unit of the air conditioner from being overhigh, wherein the control method comprises the following steps: acquiring the temperature of the coil; and when the temperature of the coil pipe exceeds a preset safety threshold value, the air conditioner is controlled to be stopped for a first preset time, then the air conditioner is restarted, and the temperature of the coil pipe is continuously detected. After the air conditioner is stopped for a times that the temperature of the coil pipe exceeds a preset safety threshold value after the air conditioner is started for the first time, when the air conditioner is started again, the rotating speed of an indoor fan of the air conditioner is increased by delta n revolutions per second on the basis of the rotating speed of the air conditioner before the air conditioner is stopped for the last time, and the temperature of the coil pipe is continuously detected after the air conditioner is continuously operated for a second preset time, so that the temperature of the coil pipe is quickly and effectively reduced by increasing the heat dissipation of the coil pipe, the frequent occurrence of the stop phenomenon is reduced or even prevented, the refrigeration effect of the air conditioner is improved, and the use experience of a user is improved; wherein a is more than or equal to 1, and delta n is more than 0.
Description
Technical Field
The present invention relates to air conditioners, and more particularly to an air conditioner and a control method for preventing an excessive temperature of a coil of an indoor unit of the air conditioner.
Background
When the existing heat pump air conditioner runs in states of heating and the like, the temperature of a coil pipe of an indoor unit is too high, a protection function in a program cannot act in time, the shutdown temperature of the air conditioner is reached, and shutdown occurs.
The control mode of the existing air conditioner is as follows: when the temperature of the coil pipe of the inner machine is overhigh and reaches X degrees, the compressor starts to reduce the frequency and reaches Y degrees, the compressor quickly reduces the frequency and reaches Z degrees, and the compressor and the air conditioner stop working (wherein Z > Y > X). After several minutes of shutdown, the air conditioner restarts and the compressor frequency remains at the previous operating frequency. If the temperature of the coil pipe of the internal machine is continuously overhigh, the machine is stopped again, and the actions are repeated. So relapse, the phenomenon of appearance is that the air conditioner does not break to shut down, and it is poor to heat the effect, influences user's use and experiences.
Disclosure of Invention
An object of the first aspect of the present invention is to overcome at least one of the drawbacks of the prior art, and to provide a control method for preventing the air conditioner from being frequently started and stopped due to the coil over-temperature protection.
It is a further object of the first aspect of the present invention to avoid air conditioner deviation from the set mode of operation due to coil over-temperature protection.
The second aspect of the invention aims to provide an air conditioner which does not have frequent start-stop phenomenon caused by over-temperature protection of a coil.
According to a first aspect of the present invention, the present invention provides a control method for preventing the coil pipe temperature of the indoor unit of the air conditioner from being too high, comprising:
acquiring the temperature of the coil;
when the temperature of the coil pipe exceeds a preset safety threshold value, controlling the air conditioner to stop for a first preset time, then restarting the air conditioner, and continuously detecting the temperature of the coil pipe; wherein
After the air conditioner is started for the first time and the shutdown times reach a times because the temperature of the coil pipe exceeds the preset safety threshold, when the air conditioner is started again, the rotating speed of an indoor fan of the air conditioner is increased by delta n revolutions per second on the basis of the rotating speed of the air conditioner before the last shutdown of the air conditioner, and the temperature of the coil pipe is continuously detected after the air conditioner is continuously operated for a second preset time;
wherein a is more than or equal to 1, and delta n is more than 0.
Optionally, after the indoor fan is continuously operated at the increased rotating speed for a second preset time, if the temperature of the coil pipe exceeds the preset safety threshold, controlling the air conditioner to stop for the first preset time;
and when the air conditioner is restarted, judging whether the rotating speed of the indoor fan before the last shutdown of the air conditioner reaches a preset maximum rotating speed value in a set mode, if not, continuously increasing the rotating speed of the indoor fan by delta n revolutions per second, and continuously detecting the temperature of the coil after continuously operating for the second preset time.
Optionally, after the indoor fan continuously operates at the increased rotation speed for the second preset time, if the temperature of the coil pipe is lower than or equal to the preset safety threshold, or the rotation speed of the indoor fan reaches the preset maximum rotation speed value in the set mode, the indoor fan continuously operates at the increased rotation speed for the second preset time, and then the temperature of the coil pipe is increased to the preset maximum rotation speed value
And keeping the rotating speed of the indoor fan unchanged until the temperature of the coil pipe is lower than a preset temperature threshold value, wherein the preset temperature threshold value is lower than the preset safety threshold value.
Optionally, after the indoor fan continuously operates for a third preset time at the preset maximum rotation speed value in the set mode, if the temperature of the coil still exceeds the preset safety threshold, the operating frequency of the compressor of the air conditioner is reduced or the compressor is controlled to stop according to the temperature of the coil.
Optionally, the specific way to reduce the operating frequency of the compressor or control the compressor to stop is:
if T0＜T≤T0+ x, the compressor is slowly down-converted at a rate of p hertz per second;
if T0+x＜T≤T0+ y, the compressor rapidly ramps down at a rate of q hertz per second;
if T > T0+ y, controlling the compressor to stop;
wherein T represents the temperature of the coil; t is0Representing the preset safety threshold; and is
x is less than y, p is less than q, and x, y, p and q are all larger than zero.
Optionally, when the temperature of the coil is lower than the preset temperature threshold, controlling the rotation speed of the indoor fan and the operating frequency of the compressor to return to initial values.
Optionally, when the number of times of shutdown is less than a times since the temperature of the coil exceeds the preset safety threshold after the air conditioner is started for the first time, after the air conditioner is started again, the rotating speed of the indoor fan of the air conditioner and the frequency of the compressor of the air conditioner are kept unchanged.
Optionally, the first preset duration is any duration value within a range of 1-4 min; or
The second preset duration is any duration value within the range of 5-10 s.
According to a second aspect of the present invention, there is also provided an air conditioner including an indoor unit having an indoor heat exchanger including a coil, the air conditioner further including:
the temperature acquisition module is used for acquiring the temperature of the coil; and
the controller is configured to control the air conditioner to be stopped for a first preset time when the temperature of the coil pipe exceeds a preset safety threshold value, and then the air conditioner is started again; and is configured to increase the rotating speed of the indoor fan of the air conditioner by delta n revolutions per second on the basis of the rotating speed of the air conditioner before the last shutdown when the air conditioner is restarted after the number of times of shutdown of the air conditioner reaches a times since the temperature of the coil pipe exceeds the preset safety threshold after the air conditioner is started for the first time;
wherein a is more than or equal to 1, and delta n is more than 0.
Optionally, the controller is further configured to, after the indoor fan continuously operates at the increased rotation speed for a second preset time, if the temperature of the coil still exceeds the preset safety threshold and the rotation speed of the indoor fan before the last shutdown of the air conditioner does not reach a preset maximum rotation speed value, control the air conditioner to be restarted after the first preset time of shutdown of the air conditioner, and continuously increase the rotation speed of the indoor fan by Δ n revolutions per second.
The inventor of the present application has recognized that if the compressor frequency and the indoor fan speed remain unchanged after each air conditioner start, the temperature of the coil is likely to rise again to the preset safety threshold in a short time, resulting in the air conditioner being stopped again. So relapse, the phenomenon of appearance opens and stops frequently for the air conditioner, and refrigeration effect is relatively poor, can seriously influence user's refrigeration experience. Therefore, in the control method, particularly after the air conditioner stops for a times of over-temperature protection of the coil, the rotating speed of the indoor fan is increased, so that the temperature of the coil is quickly and effectively reduced by increasing the heat dissipation of the coil, the frequent occurrence of the stop phenomenon is reduced or even prevented, the refrigeration effect of the air conditioner is improved, and the use experience of a user is improved.
Furthermore, since the rotating speed of the indoor fan can directly affect the sensory experience of the user, the invention also particularly sets the preset maximum rotating speed value of the indoor fan in the set mode (the values of the preset maximum rotating speed values are different in different operation modes), and the preset maximum rotating speed value cannot be exceeded when the rotating speed of the indoor fan is increased. If the temperature of the coil pipe still exceeds the preset safety threshold value after the rotating speed of the indoor fan reaches the preset maximum rotating speed value and operates for a period of time, the temperature of the coil pipe is effectively reduced by properly prolonging the time of the indoor fan operating at the preset maximum rotating speed value or reducing the operating frequency of the compressor or other modes, so that the condition that the rotating speed of the indoor fan is too high to change the operating mode set by a user and deviate from the use intention of the user is avoided.
Further, when the temperature of the coil pipe is lower than a preset temperature threshold value, the rotating speed of the indoor fan is recovered to the initial rotating speed, so that the normal operation state in the user setting mode is recovered as soon as possible.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a schematic flow chart of a control method for preventing over-temperature of a coil of an indoor unit of an air conditioner according to an embodiment of the present invention;
fig. 2 is a schematic structural block diagram of an air conditioner according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a control method according to a further embodiment of the invention.
Detailed Description
The invention firstly provides a control method for preventing the temperature of a coil pipe of an indoor unit of an air conditioner from being overhigh. Fig. 1 is a schematic flow chart of a control method for preventing over-temperature of a coil of an indoor unit of an air conditioner according to an embodiment of the present invention.
Referring to fig. 1, the control method of the present invention includes: acquiring the temperature of the coil; and when the temperature of the coil pipe exceeds a preset safety threshold value, the air conditioner is controlled to be stopped for a first preset time, then the air conditioner is restarted, and the temperature of the coil pipe is continuously detected.
On this basis, the inventor of the present application has recognized that if the compressor frequency and the rotational speed of the indoor fan 15 are kept constant after each start of the air conditioner 1, the temperature of the coil 11 is likely to rise again to the preset safety threshold in a short time, resulting in the air conditioner 1 being stopped again. So relapse, the phenomenon that appears opens and stops for air conditioner 1 frequently, and refrigeration effect is relatively poor, can seriously influence user's the experience of heating. Therefore, in the further control method of the present invention, particularly after the air conditioner 1 is shut down for a (a is greater than or equal to 1) times due to the over-temperature protection of the coil 11, the rotation speed of the indoor fan 15 is increased, so as to quickly and effectively reduce the temperature of the coil 11 by increasing the heat dissipation capability of the indoor fan 15, thereby reducing or even preventing the frequent occurrence of the shut-down phenomenon, improving the refrigeration effect of the air conditioner 1, and improving the use experience of users.
Specifically, the control method of the present invention further includes: after the air conditioner 1 is started for the first time and the shutdown times reach a times because the temperature of the coil 11 exceeds the preset safety threshold, when the air conditioner 1 is started again, the rotating speed of the indoor fan 15 of the air conditioner 1 is increased by delta n revolutions per second on the basis of the rotating speed of the air conditioner 1 before the last shutdown, and the temperature of the coil 11 is continuously detected after the air conditioner is continuously operated for a second preset time; wherein a is more than or equal to 1, and delta n is more than 0. It is understood that a is an integer of 1 or more. Δ n is preferably an integer greater than zero.
The invention also provides an air conditioner. Fig. 2 is a schematic structural block diagram of an air conditioner according to an embodiment of the present invention. Specifically, the air conditioner 1 may include an indoor unit 10 and an outdoor unit 20, wherein the indoor unit 10 has an indoor heat exchanger having a coil 11, and the temperature of the coil may be acquired by a temperature acquisition module 12. The temperature acquisition module can be a temperature sensor to directly detect the temperature of the coil; the temperature acquisition module can also be other devices capable of directly or indirectly acquiring the temperature of the coil. The indoor unit also has a controller 13, the controller 13 being configured to control the air conditioner 1 to stop when the temperature of the coil 11 exceeds a preset safety threshold, and to restart the air conditioner 1 after the time that the air conditioner 1 was stopped has lasted for a first preset time period. The stop of the air conditioner 1 means that the whole air conditioner 1 stops operating, and at this time, the compressor 14 and the indoor fan 15 of the air conditioner 1 are both in a stop state.
The controller 13 is further configured to increase the rotation speed of the indoor fan 15 of the air conditioner 1 by Δ n revolutions per second based on the rotation speed of the indoor fan 15 before the last shutdown of the air conditioner 1 when the air conditioner 1 is restarted after the number of times of shutdown of the air conditioner 1 reaches a times since the temperature of the coil 11 exceeds the preset safety threshold after the air conditioner 1 is started for the first time, so as to increase the heat dissipation capability of the indoor fan 15, thereby quickly and effectively dissipating heat from the coil 11.
Further, the first preset duration is any duration value within a range of 1-4 min, for example, the first preset duration may be 1min, 2min, 3min, or 4 min. The second preset duration can be any duration value within a range of 5-15 s, so that frequent detection of the temperature of the coil 11 due to too short time is avoided, and corresponding measures cannot be taken in time due to untimely acquisition of the temperature of the functional module 11 due to too long time is also avoided. For example, the second preset time period may be 5s, 6s, 7s, 8s, 9s, 10s, 11s, 12s, 13s, 14s, or 15 s. Preferably, the second preset duration is selected to be any duration value between 8s and 12s, so that the effect is better.
After the indoor fan 15 is continuously operated at the increased rotation speed for the second preset time period, the temperature of the coil 11 may still be higher than the preset safety threshold, and may also be lower than the preset safety threshold. After the indoor fan 15 continuously operates at the increased rotation speed for the second preset time, if the temperature of the coil 11 still exceeds the preset safety threshold and the rotation speed of the indoor fan 15 does not reach the preset maximum rotation speed value of the indoor fan in the set mode, the rotation speed of the indoor fan 15 may be continuously increased when the air conditioner 1 is restarted after being stopped for the first preset time, so as to further increase the heat dissipation capability of the air conditioner, until the temperature of the coil 11 is lower than or equal to the preset safety threshold or the rotation speed of the indoor fan 15 reaches the preset maximum rotation speed value in the set mode. It is understood that the preset maximum rotation speed value of the indoor fan 15 may be different when the operation mode of the air conditioner set by the user (e.g., high wind speed, medium wind speed, low wind speed) is different.
In particular, fig. 3 is a schematic flow chart of a control method according to a further embodiment of the invention. In some embodiments of the invention, the control method of the invention further comprises: after the indoor fan 15 continuously operates at the increased rotating speed for a second preset time, if the temperature of the coil pipe 11 exceeds a preset safety threshold, controlling the air conditioner 1 to stop for a first preset time; when the air conditioner 1 is restarted, whether the rotating speed of the indoor fan 15 before the last shutdown of the air conditioner 1 reaches the preset maximum rotating speed value in the set mode is judged, if not (namely the rotating speed of the indoor fan 15 does not reach the preset maximum rotating speed value in the set mode), the rotating speed of the indoor fan 15 is continuously increased by delta n revolutions per second, and the temperature of the coil pipe 11 is continuously detected after the indoor fan is continuously operated for the second preset time.
Further, after the indoor fan 15 continuously operates at the increased rotation speed for a second preset time, if the temperature of the coil 11 is lower than or equal to the preset safety threshold, or the rotation speed of the indoor fan 15 reaches the preset maximum rotation speed value in the set mode, the rotation speed of the indoor fan 15 is kept unchanged until the temperature of the coil 11 is lower than the preset temperature threshold.
It will be appreciated that the preset temperature threshold is below the preset safety threshold. Preferably, the difference between the preset safety threshold and the preset temperature threshold may be any temperature value within a range of 3-7 ℃. For example, the difference between the predetermined safety threshold and the predetermined temperature threshold may be 3 ℃, 4 ℃, 5 ℃, 6 ℃ or 7 ℃.
Accordingly, in some embodiments of the present invention, the controller 13 is further configured to: after the indoor fan 15 continuously operates at the increased rotating speed for the second preset time, if the temperature of the coil 11 still exceeds the preset safety threshold and the rotating speed of the indoor fan 15 does not reach the preset maximum rotating speed value of the indoor fan in the set mode, the air conditioner 1 is controlled to be stopped for the first preset time and then started again, and the rotating speed of the indoor fan 15 is continuously increased to further increase the heat dissipation capacity of the air conditioner until the temperature of the coil 11 is lower than or equal to the preset safety threshold or the rotating speed of the indoor fan 15 reaches the preset maximum rotating speed value in the set mode.
Since the rotating speed of the indoor fan 15 may directly affect the sensory experience of the user, the present invention further particularly sets a preset maximum rotating speed value of the indoor fan 15 in a set mode (different values of the preset maximum rotating speed value in different operation modes), and the preset maximum rotating speed value cannot be exceeded when the rotating speed of the indoor fan 15 is increased. If the temperature of the coil 11 still exceeds the preset safety threshold after the rotating speed of the indoor fan 15 reaches the preset maximum rotating speed value and operates for a period of time, the temperature of the coil 11 is effectively reduced by properly prolonging the time period that the indoor fan 15 operates at the preset maximum rotating speed value or reducing the operating frequency of the compressor 14 or other modes, so that the phenomenon that the operating mode set by a user is changed due to the fact that the rotating speed of the indoor fan 15 is too large is avoided, and the use intention of the user is deviated.
The present inventors have recognized that in some special cases, simply increasing the speed of the indoor fan 15 may not solve the problem of excessive temperature in the coil 11, and that the operating frequency of the compressor 14 may need to be controlled.
Specifically, in some embodiments, the control method of the present invention further comprises:
after the indoor fan 15 continuously operates at the preset maximum rotation speed value for the third preset time, if the temperature of the coil 11 still exceeds the preset safety threshold, the operating frequency of the compressor of the air conditioner 1 is reduced or the compressor 14 is controlled to stop according to the temperature of the coil 11, so as to reduce the heat productivity of the coil 11, and thus the temperature of the coil 11 is reduced. The rapid heat dissipation of the coil 11 and the reduction of the heat generated by the coil 11 are two best ways to reduce the temperature, and the combination of the two ways can reduce the temperature of the coil 11 more rapidly and effectively.
Accordingly, in some embodiments, the controller 13 is further configured to: after the indoor fan 15 continuously operates for a third preset time at the preset maximum rotation speed value in the set mode, if the temperature of the coil 11 still exceeds the preset safety threshold, the operating frequency of the compressor of the air conditioner 1 is reduced or the compressor 14 is controlled to stop according to the temperature of the coil 11.
Further, the specific way to reduce the operating frequency of the compressor 14 or control the shutdown of the compressor 14 is:
if T0＜T≤T0+ x, the compressor 14 is controlled to slow down at a rate of p Hz per second;
if T0+x＜T≤T0+ y, the compressor 14 is controlled to rapidly reduce the frequency at a rate of q Hz per second;
if T > T0+ y, controlling the compressor 14 to stop;
wherein T represents the temperature of the coil; t is0Indicating the preset safety threshold; and x is more than y, p is more than q, and x, y, p and q are all more than zero.
Specifically, x may be 9, 10, 11 or other suitable values, y may be 18, 20, 22 or other suitable values, p may be 0.5, 1.0, 1.5 or other suitable values, and q may be 1.8, 2.0, 2.2 or other suitable values. The values of x, y, p and q can be different according to the type, model or other specifications of the air conditioner.
In some embodiments, the control method of the present invention further comprises: when the temperature of the coil 11 is lower than the preset temperature threshold, the rotation speed of the indoor fan 15 and the operation frequency of the compressor 14 are controlled to be restored to the initial values. The initial values of the rotation speed of the indoor fan 15 and the operation frequency of the compressor 14 mean values when the air conditioner 1 is in a normal operation state in the set mode.
Accordingly, in some embodiments, the controller 13 is further configured to control the rotation speed of the indoor fan 15 and the operating frequency of the compressor 14 to return to the initial values when the temperature of the coil 11 is below the preset temperature threshold.
In some embodiments, the control method of the present invention further comprises: when the number of times of shutdown is less than a times since the temperature of the coil 11 exceeds the preset safety threshold after the air conditioner 1 is started for the first time, the rotating speed of the indoor fan 15 of the air conditioner 1 and the frequency of the compressor 14 of the air conditioner 1 are kept unchanged after the air conditioner 1 is started again. That is, the rotation speed of the indoor fan 15 and the operation frequency of the compressor 14 are both values when the air conditioner is in a normal operation state in the set mode.
Accordingly, in some embodiments, the controller 13 is further configured to control the rotation speed of the indoor fan 15 of the air conditioner 1 and the frequency of the compressor 14 of the air conditioner 1 to be constant when the air conditioner 1 is restarted when the number of times of shutdown since the temperature of the coil 11 exceeds the preset safety threshold is less than a times since the air conditioner 1 was started for the first time.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (8)
1. A control method for preventing the overhigh temperature of a coil pipe of an indoor unit of an air conditioner is characterized by comprising the following steps:
acquiring the temperature of the coil;
when the temperature of the coil pipe exceeds a preset safety threshold value, controlling the air conditioner to stop for a first preset time, then restarting the air conditioner, and continuously detecting the temperature of the coil pipe; wherein
After the air conditioner is started for the first time and the shutdown times reach a times because the temperature of the coil pipe exceeds the preset safety threshold, when the air conditioner is started again, the rotating speed of an indoor fan of the air conditioner is increased by delta n revolutions per second on the basis of the rotating speed of the air conditioner before the last shutdown of the air conditioner, and the temperature of the coil pipe is continuously detected after the air conditioner is continuously operated for a second preset time; wherein a is more than or equal to 1, and delta n is more than 0;
after the indoor fan is continuously operated at the increased rotating speed for a second preset time, if the temperature of the coil pipe exceeds the preset safety threshold value, controlling the air conditioner to stop for the first preset time;
and when the air conditioner is restarted, judging whether the rotating speed of the indoor fan before the last shutdown of the air conditioner reaches a preset maximum rotating speed value in a set mode, if not, continuously increasing the rotating speed of the indoor fan by delta n revolutions per second, and continuously detecting the temperature of the coil after continuously operating for the second preset time.
2. The control method according to claim 1,
after the indoor fan continuously operates at the increased rotating speed for the second preset time, if the temperature of the coil pipe is lower than or equal to the preset safety threshold value, or the rotating speed of the indoor fan reaches the preset maximum rotating speed value in the set mode, the indoor fan continuously operates at the increased rotating speed for the second preset time, and then the indoor fan continuously operates at the increased rotating speed for the second preset time
And keeping the rotating speed of the indoor fan unchanged until the temperature of the coil pipe is lower than a preset temperature threshold value, wherein the preset temperature threshold value is lower than the preset safety threshold value.
3. The control method according to claim 2,
and after the indoor fan continuously operates for a third preset time at the preset maximum rotating speed value in the set mode, if the temperature of the coil still exceeds the preset safety threshold, reducing the operating frequency of the compressor of the air conditioner or controlling the compressor to stop according to the temperature of the coil.
4. The control method according to claim 3, wherein the specific manner of reducing the operating frequency of the compressor or controlling the compressor to stop is:
if T0＜T≤T0+ x, the compressor is slowly down-converted at a rate of p hertz per second;
if T0+x＜T≤T0+ y, the compressor rapidly ramps down at a rate of q hertz per second;
if T > T0+ y, controlling the compressor to stop;
wherein T represents the temperature of the coil; t is0Representing the preset safety threshold; and is
x is less than y, p is less than q, and x, y, p and q are all larger than zero.
5. The control method according to claim 4,
and when the temperature of the coil pipe is lower than the preset temperature threshold value, controlling the rotating speed of the indoor fan and the running frequency of the compressor to recover to initial values.
6. The control method according to claim 1,
when the number of times of stopping the air conditioner is less than a times because the temperature of the coil pipe exceeds the preset safety threshold value after the air conditioner is started for the first time, and after the air conditioner is started again, the rotating speed of an indoor fan of the air conditioner and the frequency of a compressor of the air conditioner are kept unchanged.
7. The control method according to claim 1,
the first preset duration is any duration value within the range of 1-4 min; or
The second preset duration is any duration value within the range of 5-10 s.
8. An air conditioner, includes the indoor set that has indoor heat exchanger, indoor heat exchanger includes the coil pipe, its characterized in that, the air conditioner still includes:
the temperature acquisition module is used for acquiring the temperature of the coil; and
the controller is configured to control the air conditioner to be stopped for a first preset time when the temperature of the coil pipe exceeds a preset safety threshold value, and then the air conditioner is started again; and is configured to increase the rotating speed of the indoor fan of the air conditioner by delta n revolutions per second on the basis of the rotating speed of the air conditioner before the last shutdown when the air conditioner is restarted after the number of times of shutdown of the air conditioner reaches a times since the temperature of the coil pipe exceeds the preset safety threshold after the air conditioner is started for the first time;
wherein a is more than or equal to 1, and delta n is more than 0;
and the controller is also configured to control the air conditioner to be started again after the air conditioner is stopped for the first preset time and continuously increase the rotating speed of the indoor fan by delta n revolutions per second after the indoor fan continuously operates at the increased rotating speed for the second preset time, if the temperature of the coil pipe still exceeds the preset safety threshold value and the rotating speed of the indoor fan before the last stop of the air conditioner does not reach the preset maximum rotating speed value.
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| CN110131832B (en) * | 2019-05-10 | 2021-07-30 | 宁波奥克斯电气股份有限公司 | Control method and device for high-temperature protection of air conditioner |
| CN112178884B (en) * | 2019-07-05 | 2024-05-03 | 珠海格力电器股份有限公司 | Air conditioner control method and device, air conditioner, electronic equipment and storage medium |
| CN113357798A (en) * | 2020-03-06 | 2021-09-07 | 青岛海尔空调器有限总公司 | Heating control method of air conditioner and air conditioner |
| CN111692725B (en) * | 2020-03-13 | 2022-07-05 | 广东美的制冷设备有限公司 | Control method of air conditioner and air conditioner |
| CN111442459A (en) * | 2020-03-17 | 2020-07-24 | 海信（山东）空调有限公司 | Control method of air conditioner, storage medium and air conditioner |
| CN111706974B (en) * | 2020-06-05 | 2021-12-17 | 美的集团武汉暖通设备有限公司 | Control method of air conditioner, air conditioner and storage medium |
| CN111878971A (en) * | 2020-06-30 | 2020-11-03 | 宁波奥克斯电气股份有限公司 | Air conditioner control method and device and air conditioner |
| CN113587356B (en) * | 2021-06-02 | 2022-11-25 | 宁波奥克斯电气股份有限公司 | Control method and device for preventing heating of air conditioner from being blocked and air conditioner |
| CN114234395A (en) * | 2021-11-25 | 2022-03-25 | 青岛海尔空调器有限总公司 | Method and device for protecting coil pipe and air conditioner |
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| JP5003829B2 (en) * | 2011-01-19 | 2012-08-15 | ダイキン工業株式会社 | Air conditioner |
| CN102261720B (en) * | 2011-06-24 | 2013-04-03 | 宁波奥克斯电气有限公司 | Control method for preventing overtemperature in center of condenser of direct current (DC) multi-frequency conversion outdoor machine during refrigeration |
| CN102364258B (en) * | 2011-09-23 | 2013-08-07 | 宁波奥克斯电气有限公司 | Protection method for preventing superheat during heating of multi-connection air conditioning unit |
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Effective date of registration: 20210408 Address after: 266101 Haier Industrial Park, 1 Haier Road, Laoshan District, Shandong, Qingdao Applicant after: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Applicant after: Haier Zhijia Co.,Ltd. Address before: 266101 Haier Industrial Park, 1 Haier Road, Laoshan District, Shandong, Qingdao Applicant before: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. |
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