CN113124544A - Air conditioning unit and defrosting control method thereof - Google Patents
Air conditioning unit and defrosting control method thereof Download PDFInfo
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- CN113124544A CN113124544A CN202110426600.4A CN202110426600A CN113124544A CN 113124544 A CN113124544 A CN 113124544A CN 202110426600 A CN202110426600 A CN 202110426600A CN 113124544 A CN113124544 A CN 113124544A
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
- F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
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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
- F24F2110/12—Temperature of the outside air
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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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- Mathematical Physics (AREA)
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- Air Conditioning Control Device (AREA)
Abstract
The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioning unit and a defrosting control method thereof. The invention aims to solve the problem that the existing defrosting control method of the air conditioning unit is difficult to accurately judge the optimal time for the air conditioning unit to enter the defrosting mode. To this end, the defrost control method of the present invention comprises: acquiring the temperature of the outdoor coil pipe under the condition that the current outdoor temperature is less than or equal to the preset outdoor temperature; if the duration time of the temperature of the outdoor coil pipe is less than or equal to the preset outdoor coil pipe temperature reaches a first preset duration time, further acquiring the current of the outdoor fan; selectively acquiring the air outlet temperature of the outdoor unit according to the acquired current of the outdoor fan; according to the current outdoor temperature and the air outlet temperature of the outdoor unit, the air conditioning unit is selectively operated in the defrosting mode, so that the air conditioning unit can enter the defrosting mode at the most appropriate time, and the heating effect of the air conditioning unit is effectively ensured.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioning unit and a defrosting control method thereof.
Background
The air conditioning unit comprises an indoor unit, an outdoor unit and a refrigerant circulation loop connected between the indoor unit and the outdoor unit, wherein the refrigerant continuously exchanges heat between the outdoor unit and the indoor unit through the refrigerant circulation loop. Taking the air conditioning unit to operate under a heating working condition as an example, the coil pipe of the outdoor unit is always in a low-temperature state, and the outdoor temperature is also low; at this time, if the outdoor environment still has a high humidity, the coil of the outdoor unit is easy to frost, and along with the continuous progress of the frost, the heat exchange efficiency of the outdoor unit is also rapidly reduced, the wind resistance is increased, and the heating capacity of the whole air conditioning unit is further reduced continuously. Therefore, when the air conditioning unit operates in a heating working condition, whether the coil of the outdoor unit is frosted needs to be monitored frequently, and a proper time needs to be selected to enter a defrosting mode so as to avoid unnecessary energy loss.
When the existing air conditioning unit judges the defrosting time, the judgment modes of the existing air conditioning unit are not correspondingly distinguished according to different conditions of outdoor environment temperature, so that the problem of inaccurate judgment result is easily caused. Specifically, when the air conditioning unit heats in an ultra-low temperature environment, the outdoor ambient temperature and humidity are often very low, and the evaporation temperature thereof is also very low, thereby causing a problem that it is difficult to accurately judge the frosting condition through the coil temperature. In other words, under the condition that the outdoor environment temperature is very low and the humidity is very low, the air conditioning unit is easy to misjudge, so that the air conditioning unit enters unnecessary false defrosting, the heating performance of the air conditioning unit is frequently influenced, and the heat exchange efficiency of the air conditioning unit and the comfort level of a user are seriously influenced.
Accordingly, there is a need in the art for a new air conditioning unit and a defrost control method thereof to solve the above problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem that the defrosting control method of the existing air conditioning unit is difficult to accurately determine the optimal time for the air conditioning unit to enter the defrosting mode, the present invention provides a defrosting control method of an air conditioning unit, wherein the air conditioning unit comprises an outdoor unit, the outdoor unit comprises an outdoor coil and an outdoor fan, and the defrosting control method comprises: acquiring the temperature of the outdoor coil pipe under the condition that the current outdoor temperature is less than or equal to the preset outdoor temperature; if the duration time of the temperature of the outdoor coil pipe is less than or equal to the preset outdoor coil pipe temperature reaches a first preset duration time, further acquiring the current of the outdoor fan; selectively acquiring the air outlet temperature of the outdoor unit according to the acquired current of the outdoor fan; and selectively enabling the air conditioning unit to operate in a defrosting mode according to the current outdoor temperature and the air outlet temperature of the outdoor unit.
In a preferred technical solution of the above-mentioned defrosting control method, "selectively obtaining the outlet air temperature of the outdoor unit according to the obtained current of the outdoor fan" specifically includes: calculating a ratio of the current of the outdoor fan to a preset current, and recording the ratio as a first ratio; and if the first ratio is larger than a first preset ratio, acquiring the air outlet temperature of the outdoor unit.
In a preferred technical solution of the above defrosting control method, the preset current is determined in the following manner: acquiring the current of the outdoor fan for multiple times within a second preset time after the last defrosting is finished; and calculating the average value of the obtained currents of the outdoor fans, namely the preset current.
In a preferred embodiment of the above defrosting control method, the control method further includes: under the condition that the first ratio is smaller than or equal to the first preset ratio, further acquiring the duration of the current heating operation of the air conditioning unit; and if the duration of the current heating operation of the air conditioning unit reaches a third preset duration, enabling the air conditioning unit to operate in a defrosting mode.
In a preferred technical solution of the above-mentioned defrosting control method, "selectively operating the air conditioning unit in a defrosting mode according to the current outdoor temperature and the outlet air temperature of the outdoor unit" specifically includes: calculating the ratio of a preset difference value to the difference value between the current outdoor temperature and the air outlet temperature of the outdoor unit, and recording the ratio as a second ratio; comparing the second ratio with a second preset ratio; and selectively enabling the air conditioning unit to operate in a defrosting mode according to the comparison result of the second ratio and the second preset ratio.
In a preferred technical solution of the above-mentioned defrosting control method, "selectively operating the air conditioning unit in the defrosting mode according to a comparison result between the second ratio and the second preset ratio" includes: and if the second ratio is larger than the second preset ratio, enabling the air conditioning unit to operate in a defrosting mode.
In a preferred technical solution of the above-mentioned defrosting control method, "selectively operating the air conditioning unit in the defrosting mode according to a comparison result between the second ratio and the second preset ratio" includes: if the second ratio is smaller than or equal to the second preset ratio, further acquiring the duration of the current heating operation of the air conditioning unit; and if the duration of the current heating operation of the air conditioning unit reaches a fourth preset duration, enabling the air conditioning unit to operate in a defrosting mode.
In a preferred technical solution of the above defrosting control method, the predetermined difference is determined in the following manner: acquiring the air outlet temperature of the outdoor unit and at least acquiring the outdoor temperature once for a plurality of times within a fifth preset time after the last defrosting is finished; and calculating the difference value between the outdoor temperature and the average value of the obtained air outlet temperatures of the outdoor units, namely the preset difference value.
In a preferred embodiment of the above-described defrosting control method, the defrosting control method further includes: under the condition that the temperature of the outdoor coil is greater than the preset outdoor coil temperature, or the duration time of the temperature of the outdoor coil is less than or equal to the preset outdoor coil temperature does not reach the first preset duration time, further acquiring the duration time of the heating operation of the air conditioning unit; and if the duration of the current heating operation of the air conditioning unit reaches a sixth preset duration, enabling the air conditioning unit to operate in a defrosting mode.
The invention also provides an air conditioning unit, which comprises a controller, wherein the controller can execute the defrosting control method in any one of the preferable technical scheme.
As can be understood by those skilled in the art, in the technical solution of the present invention, an air conditioning unit of the present invention includes an outdoor unit, the outdoor unit includes an outdoor coil and an outdoor fan, and a defrosting control method of the present invention includes: acquiring the temperature of the outdoor coil pipe under the condition that the current outdoor temperature is less than or equal to the preset outdoor temperature; if the duration time of the temperature of the outdoor coil pipe is less than or equal to the preset outdoor coil pipe temperature reaches a first preset duration time, further acquiring the current of the outdoor fan; selectively acquiring the air outlet temperature of the outdoor unit according to the acquired current of the outdoor fan; and selectively enabling the air conditioning unit to operate in a defrosting mode according to the current outdoor temperature and the air outlet temperature of the outdoor unit. The defrosting control method is specially provided aiming at the condition of low outdoor temperature, and the defrosting control method can accurately judge the frosting condition of the outdoor unit under the condition of ultralow-temperature heating so that the air conditioning unit can enter a defrosting mode at the most proper time, thereby effectively ensuring the heating effect of the air conditioning unit and effectively improving the operation efficiency of the air conditioning unit and the heat exchange experience of users. In addition, the air conditioning unit can realize the acquisition of parameters by depending on the original electronic elements, namely, the defrosting control method can be executed without additionally arranging other electronic elements, so that the structure of the air conditioning unit is effectively ensured to be free from any modification, the manufacturing cost of the air conditioning unit is not increased, and the application is very convenient.
Drawings
FIG. 1 is a flow chart of the main steps of the defrost control method of the present invention;
fig. 2 is a detailed flow chart of the steps of a preferred embodiment of the defrost control method of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. And can be adjusted as needed by those skilled in the art to suit particular applications. For example, the air conditioning unit described in the present invention may be a split air conditioning unit or a multi-split air conditioning unit, and such application objects may be changed without departing from the basic principle of the present invention, and shall fall within the protection scope of the present invention.
It should be noted that in the description of the preferred embodiment, the terms of direction or positional relationship indicated by the terms "inside", "outside", and the like are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Also, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, in the description of the present invention, unless otherwise explicitly specified or limited, the term "connected" is to be understood broadly, and may be, for example, directly connected, indirectly connected through an intermediate, or communicating between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. Although the steps of the control method of the present invention are described herein in a particular order, the order is not limiting and those skilled in the art can perform the steps in a different order without departing from the basic principles of the invention.
Based on the problem that the existing defrosting control method of the air conditioning unit pointed out in the background technology is difficult to accurately judge the optimal time for the air conditioning unit to enter the defrosting mode, the invention provides a new defrosting control method, and the defrosting control method can acquire the temperature of an outdoor coil pipe under the condition that the current outdoor temperature is less than or equal to the preset outdoor temperature; if the duration time of the temperature of the outdoor coil pipe is less than or equal to the preset outdoor coil pipe temperature reaches a first preset duration time, further acquiring the current of the outdoor fan; selectively acquiring the air outlet temperature of the outdoor unit according to the acquired current of the outdoor fan; and selectively enabling the air conditioning unit to operate in a defrosting mode according to the current outdoor temperature and the air outlet temperature of the outdoor unit, so that the air conditioning unit can enter the defrosting mode at the most appropriate time, and further effectively improving the operating efficiency of the air conditioning unit.
Specifically, the air conditioning unit comprises an indoor unit and an outdoor unit, wherein an indoor coil pipe is arranged in the indoor unit, an outdoor coil pipe and an outdoor fan are arranged in the outdoor unit, and the indoor coil pipe is connected with the outdoor coil pipe through a refrigerant circulation loop to realize heat exchange, so that the effect of changing the room temperature is realized; the outdoor fan is arranged near the outdoor coil pipe so as to effectively improve the heat exchange efficiency of the outdoor coil pipe. It should be noted that, a person skilled in the art may set a specific structure of the air conditioning unit according to actual use requirements, for example, a specific number of the indoor units, a specific type and a specific location of the outdoor fan, and the like. Such specific structural changes in the air conditioning assembly do not depart from the basic principle of the present invention and should fall within the protection scope of the present invention.
Further, the air conditioning unit further comprises an outdoor temperature sensor, an outdoor coil pipe temperature sensor and an air outlet temperature sensor, wherein the outdoor temperature sensor can detect the outdoor temperature of the outdoor unit, the outdoor coil pipe temperature sensor can detect the temperature of the outdoor coil pipe, and the air outlet temperature sensor can detect the air outlet temperature of the outdoor unit. It should be noted that, the present invention does not limit the specific type, specific setting position and specific setting number of the temperature sensors, and the technicians can set the temperature sensors according to the actual use requirements; such changes do not depart from the basic concept of the present invention and should fall within the scope of the present invention.
In addition, the air conditioning unit further comprises a controller, wherein the controller can acquire detection data of each sensor; specifically, the outdoor temperature of the outdoor unit is detected by the outdoor temperature sensor, the temperature of the outdoor coil is detected by the outdoor coil temperature sensor, and the outlet air temperature of the outdoor unit is detected by the outlet air temperature sensor. The controller may also be capable of controlling an operating mode of the air conditioning unit, for example, controlling the air conditioning unit to operate in a defrost mode.
It should be noted that, the invention does not limit the specific operation executed after the air conditioning unit enters the defrosting mode, and the technical personnel can set the operation according to the actual use requirement; for example, defrosting of the outdoor coil can be realized by controlling the reversing of the four-way valve; also for example, defrosting of the outdoor coil may be accomplished by means of an electric heater; also for example, it is possible to realize different levels of defrost modes by combining multiple defrost modes, which is not limitative.
In addition, it can be understood by those skilled in the art that the present invention does not limit the specific structure and model of the controller, and the controller may be the original controller of the air conditioning unit, or may be a controller separately configured to execute the defrosting control method of the present invention, and the structure and model of the controller may be set by the skilled person according to the actual use requirement.
Referring first to fig. 1, a flow chart of the main steps of the defrost control method of the present invention is shown. As shown in fig. 1, based on the air conditioning unit described in the above embodiment, the defrosting control method of the present invention mainly includes the following steps:
s1: acquiring the temperature of the outdoor coil pipe under the condition that the current outdoor temperature is less than or equal to the preset outdoor temperature;
s2: if the duration time of the temperature of the outdoor coil pipe is less than or equal to the preset outdoor coil pipe temperature reaches a first preset duration time, further acquiring the current of the outdoor fan;
s3: selectively acquiring the air outlet temperature of the outdoor unit according to the acquired current of the outdoor fan;
s4: and selectively enabling the air conditioning unit to operate in a defrosting mode according to the current outdoor temperature and the air outlet temperature of the outdoor unit.
In step S1, when the current outdoor temperature is less than or equal to the preset outdoor temperature, it indicates that the air conditioning unit is operating in the heating mode in the ultra-low temperature environment, and in this case, the controller can detect the temperature of the outdoor coil through the outdoor coil temperature sensor. It should be noted that the present invention does not limit the specific value of the preset outdoor temperature, and a technician may set the preset outdoor temperature according to actual use requirements, and preferably, the preset outdoor temperature may be set according to local humidity conditions. Further preferably, the preset outdoor temperature is set to-15 ℃.
In addition, it should be noted that the invention does not limit the specific way of obtaining the temperature of the outdoor coil, and the technician can set the temperature according to the actual use requirement; preferably, a plurality of outdoor coil temperature sensors are arranged on the outdoor coil, the temperature of multiple points on the outdoor coil can be acquired through the plurality of outdoor coil temperature sensors, and based on the acquired temperatures of the plurality of coils, the controller can select the lowest temperature as the temperature of the outdoor coil, so that the temperature of the part, where the frosting phenomenon is most likely to occur, on the heat exchange coil is taken as the temperature of the outdoor coil.
Based on the obtaining result of the step S1, in step S2, if the controller determines that the duration of the temperature of the outdoor coil is less than or equal to the preset outdoor coil temperature reaches the first preset duration, the controller further obtains the current of the outdoor fan; it should be noted that, the present invention does not limit the specific way in which the controller obtains the current of the outdoor fan, and a technician can set the current according to actual use requirements.
In addition, it should be noted that, the specific values of the preset outdoor coil temperature and the first preset time period are not limited, and a technician can set the values according to actual use requirements; preferably, the preset outdoor coil temperature is set to-20 ℃, and the first preset time is set to 5 min.
Based on the obtaining result of the step S2, in step S3, the controller can selectively obtain the outlet air temperature of the outdoor unit according to the obtained current of the outdoor fan; it should be noted that, the present invention does not limit the specific determination conditions used in this step, and a technician may set the determination conditions according to actual needs, and may further obtain the outlet air temperature of the outdoor unit as long as the obtained current of the outdoor fan determines that the outdoor unit has a risk of frosting.
Further, in step S4, the controller can selectively operate the air conditioning unit in a defrost mode according to the current outdoor temperature and the outlet air temperature of the outdoor unit. It should be noted that, the present invention does not limit the specific determination conditions used in this step, and a technician may set the determination conditions according to actual needs, for example, the defrosting mode of the air conditioning unit is controlled only when the current outdoor temperature and the outlet air temperature of the outdoor unit exceed a certain range, or the defrosting mode of the air conditioning unit is controlled only when the current outdoor temperature and the outlet air temperature of the outdoor unit satisfy a certain relational expression. The change of these specific control logics does not deviate from the basic principle of the present invention, and it should belong to the protection scope of the present invention, as long as the judgment condition used in this step is to judge whether the outdoor unit has frosting phenomenon by the current outdoor temperature and the outlet air temperature of the outdoor unit, so as to make the air conditioning unit selectively operate the defrosting mode; .
Referring now to fig. 2, a detailed flow chart of the steps of a preferred embodiment of the defrost control method of the present invention is shown. As shown in fig. 2, based on the air conditioning unit described in the foregoing embodiment, a preferred embodiment of the defrosting control method of the present invention specifically includes the following steps:
s101: under the condition that the air conditioning unit operates in a heating mode, acquiring the current outdoor temperature;
s102: judging whether the current outdoor temperature is less than or equal to a preset outdoor temperature or not; if not, executing step S103; if yes, executing step S104;
s103: judging whether the air conditioning unit needs to operate a defrosting mode or not in a conventional defrosting judgment mode;
s104: acquiring the temperature of an outdoor coil pipe;
s105: judging whether the duration time of the temperature of the outdoor coil pipe is less than or equal to the preset temperature of the outdoor coil pipe reaches a first preset duration time or not; if not, executing step S106; if yes, go to step S108;
s106: acquiring the duration of the heating operation of the air conditioning unit;
s107: if the duration of the heating operation of the air conditioning unit reaches a sixth preset duration, the air conditioning unit is operated in a defrosting mode;
s108: acquiring the current of an outdoor fan;
s109: calculating the ratio of the current of the outdoor fan to the preset current, and recording the ratio as a first ratio;
s110: judging whether the first ratio is larger than a first preset ratio or not; if not, executing step S111; if so, go to step S113;
s111: acquiring the duration of the heating operation of the air conditioning unit;
s112: if the duration of the heating operation of the air conditioning unit reaches a third preset duration, enabling the air conditioning unit to operate in a defrosting mode;
s113: acquiring the air outlet temperature of the outdoor unit;
s114: calculating the ratio of the preset difference to the difference between the current outdoor temperature and the air outlet temperature of the outdoor unit, and recording the ratio as a second ratio;
s115: judging whether the second ratio is larger than a second preset ratio or not; if not, go to step S116; if so, go to step S118;
s116: acquiring the duration of the heating operation of the air conditioning unit;
s117: if the duration of the heating operation of the air conditioning unit reaches a fourth preset duration, enabling the air conditioning unit to operate in a defrosting mode;
s118: and enabling the air conditioning unit to operate in a defrosting mode.
In step S101, when the air conditioning unit operates in the heating mode, the controller may obtain a current outdoor temperature through the outdoor temperature sensor; it should be noted that, this obtaining method is not restrictive, and the technician may set the obtaining method according to the actual use requirement; for example, the current outdoor temperature may also be obtained in a networked manner.
Next, in step S102, the controller can determine whether the current outdoor temperature acquired in step S101 is less than or equal to the preset outdoor temperature, so as to determine whether the outdoor unit is operated in the ultra-low temperature environment. It should be noted that the present invention does not limit the specific value of the preset outdoor temperature, and a technician may set the preset outdoor temperature according to actual use requirements, and preferably, the preset outdoor temperature may be set according to local humidity conditions. Further preferably, the preset outdoor temperature is set to-15 ℃.
Based on the determination result of step S102, if the current outdoor temperature is greater than the preset outdoor temperature, step S103 is executed, that is, the controller can determine whether the air conditioning unit needs to operate the defrosting mode through a conventional defrosting determination manner. It should be noted that, the present invention does not limit the determination method involved in this step, and the technician can set the determination method according to the actual use requirement; for example, the determination is made directly from the temperature of the outdoor coil, or the determination is made directly from the outlet air temperature.
Based on the determination result of step S102, if the current outdoor temperature is less than or equal to the preset outdoor temperature, step S104 is executed, that is, the controller can detect the temperature of the outdoor coil through the outdoor coil temperature sensor. It should be noted that, the invention does not limit the specific way of obtaining the temperature of the outdoor coil, and technicians can set the temperature according to actual use requirements; preferably, a plurality of outdoor coil temperature sensors are arranged on the outdoor coil, the temperature of multiple points on the outdoor coil can be acquired through the plurality of outdoor coil temperature sensors, and based on the acquired temperatures of the plurality of coils, the controller can select the lowest temperature as the temperature of the outdoor coil, so that the temperature of the part, where the frosting phenomenon is most likely to occur, on the heat exchange coil is taken as the temperature of the outdoor coil.
Next, in step S105, the controller may determine whether the duration of the temperature of the outdoor coil being less than or equal to the preset outdoor coil temperature reaches the first preset duration. It should be noted that, the specific values of the preset outdoor coil temperature and the first preset time period are not limited, and a technician can set the values according to actual use requirements; preferably, the preset outdoor coil temperature is set to-20 ℃, and the first preset time is set to 5 min.
Based on the judged result of step S105, if the temperature of outdoor coil pipe is greater than predetermine outdoor coil pipe temperature, perhaps, the temperature less than or equal to of outdoor coil pipe predetermine the duration of outdoor coil pipe temperature and not reach first predetermineeing long, then execute step S106, promptly, the controller further acquires air conditioning unit this heats duration of operation long to on the basis of avoiding false defrosting phenomenon to appear, can also effectively avoid the problem that air conditioning unit is not in time defrosted. Based on this, in step S108, if the duration of the current heating operation of the air conditioning unit reaches the sixth preset duration, the air conditioning unit is operated in the defrosting mode; otherwise, the defrost mode is not operated. It should be noted that, the specific value of the sixth preset time period is not limited, and a technician can set the time period according to actual use requirements; preferably, the sixth preset time period is set to 3 hours.
Based on the judgment result of the step S105, if the duration of the temperature of the outdoor coil is less than or equal to the preset outdoor coil temperature reaches the first preset duration, executing a step S108, that is, the controller further obtains the current of the outdoor fan; it should be noted that, the present invention does not limit the specific way in which the controller obtains the current of the outdoor fan, and a technician can set the current according to actual use requirements.
Further, in step S109, the controller may calculate a ratio of the current of the outdoor fan to the preset current, which is recorded as a first ratio. As a preferred setting mode, the controller can obtain the current of the outdoor fan for multiple times within a second preset time after the last defrosting of the air conditioning unit is finished, and calculate an average value of the multiple currents, namely the preset current; of course, the preset current may also be a set fixed value. Preferably, the second preset time period is set to 3min, that is, within 3min after the last defrosting of the air conditioning unit is finished, the controller may obtain the current of the outdoor fan for multiple times, and calculate an average value of the multiple currents, that is, the preset current. In addition, a technician may set the specific value of the second preset time period and the number of times of obtaining the current of the outdoor fan according to actual use requirements, which is not limiting.
Further preferably, the current of the outdoor fan used in this step is also an average value of values taken for multiple times within a second preset time period before the current time, taking the second preset time period as 3min as an example, the current of the outdoor fan is the average value of the current of the outdoor fan within 3min before the current time, and of course, a technician may set the number of times of obtaining the average value according to actual use requirements.
Next, in step S110, the controller can determine whether the first ratio is greater than the first preset ratio, so as to perform different operations accordingly. It should be noted that, the value of the first preset ratio is not limited in any way; as a preferred setting value, the first predetermined ratio is set to 1.04, so as to improve the accuracy of the determination to the greatest extent.
Based on the judgment result in step S110, if the first ratio is less than or equal to the first preset ratio, step S111 is executed, that is, the controller further obtains the duration of the current heating operation of the air conditioning unit, and based on this, in step S112, if the duration of the current heating operation of the air conditioning unit reaches the third preset duration, the air conditioning unit is operated in the defrosting mode; otherwise, the defrost mode is not operated. It should be noted that, the specific value of the third preset duration is not limited, and a technician can set the third preset duration according to actual use requirements; preferably, the third preset time period is less than the sixth preset time period.
Based on the determination result in step S110, if the first ratio is greater than the first preset ratio, step S113 is executed, that is, the controller further obtains the outlet air temperature of the outdoor unit.
Further, in step S114, the controller calculates a ratio of the preset difference to a difference between the current outdoor temperature and the outlet air temperature of the outdoor unit, and records the ratio as a second ratio. As a preferable setting mode, in a fifth preset time period after the last defrosting of the air conditioning unit is finished, the controller may obtain the outlet air temperature of the outdoor unit and at least one outdoor temperature, and calculate a difference between the outdoor temperature and an average value of the outlet air temperatures of the outdoor units, which is the preset difference. If the outdoor temperature is obtained only once within a fifth preset time after the last defrosting of the air conditioning unit is finished, calculating the difference value between the outdoor temperature and the average value of the outlet air temperatures of the outdoor units; and if the outdoor temperatures are obtained for multiple times within a fifth preset time after the last defrosting of the air conditioning unit is finished, calculating the difference value between the average value of the outdoor temperatures and the average value of the outlet air temperatures of the outdoor units. Preferably, the fifth preset time period is set to 10min, that is, within 10min after the last defrosting of the air conditioning unit is finished, the controller may obtain the outlet air temperature of the outdoor unit and at least one outdoor temperature for multiple times, and calculate a difference between the outdoor temperature and an average value of the outlet air temperatures of the multiple outdoor units, that is, the preset difference. In addition, a technician may set the specific value of the fifth preset time and the number of times of acquiring the outlet air temperature of the outdoor unit according to actual use requirements, which is not limited.
Further preferably, the outlet air temperature of the outdoor unit used in this step is also an average value of values taken a plurality of times within a preset time period before the current time, and preferably an average value within 3min is used, that is, the outlet air temperature of the outdoor unit is an average value of the outlet air temperature of the outdoor unit within 3min before the current time, a difference between the current outdoor temperature and the average value of the outlet air temperature is calculated, and then a ratio between the preset difference and the difference is calculated and recorded as a second ratio. Of course, the technician can set the acquisition times for calculating the average value according to the actual use requirement.
Next, in step S115, the controller can determine whether the second ratio is greater than the second preset ratio, so as to perform different operations accordingly. It should be noted that, the value of the second preset ratio is not limited in any way; as a preferred setting value, the second predetermined ratio is set to 2, so as to improve the accuracy of the determination to the greatest extent.
Based on the judgment result in step S115, if the second ratio is less than or equal to the second preset ratio, step S116 is executed, that is, the controller further obtains the duration of the current heating operation of the air conditioning unit, and based on this, in step S117, if the duration of the current heating operation of the air conditioning unit reaches the fourth preset duration, the air conditioning unit is operated in the defrosting mode; otherwise, the defrost mode is not operated. It should be noted that, the specific value of the fourth preset duration is not limited, and a technician can set the value according to actual use requirements; preferably, the fourth preset time period is less than the third preset time period.
Based on the determination result in step S115, if the second ratio is greater than the second preset ratio, step S118 is executed, that is, the controller can enable the air conditioning unit to operate in the defrosting mode, so that on the basis of avoiding the false defrosting phenomenon, the problem that the air conditioning unit is not defrosted in time can be effectively avoided
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is apparent that the scope of the present invention is not limited to these specific embodiments, as will be readily understood by those skilled in the art. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A defrosting control method of an air conditioning unit, the air conditioning unit comprises an outdoor unit, the outdoor unit comprises an outdoor coil and an outdoor fan, and the defrosting control method is characterized by comprising the following steps:
acquiring the temperature of the outdoor coil pipe under the condition that the current outdoor temperature is less than or equal to the preset outdoor temperature;
if the duration time of the temperature of the outdoor coil pipe is less than or equal to the preset outdoor coil pipe temperature reaches a first preset duration time, further acquiring the current of the outdoor fan;
selectively acquiring the air outlet temperature of the outdoor unit according to the acquired current of the outdoor fan;
and selectively enabling the air conditioning unit to operate in a defrosting mode according to the current outdoor temperature and the air outlet temperature of the outdoor unit.
2. The defrosting control method according to claim 1, wherein the step of selectively obtaining the outlet air temperature of the outdoor unit according to the obtained current of the outdoor fan specifically includes:
calculating a ratio of the current of the outdoor fan to a preset current, and recording the ratio as a first ratio;
and if the first ratio is larger than a first preset ratio, acquiring the air outlet temperature of the outdoor unit.
3. The defrost control method of claim 2, wherein the preset current is determined by:
acquiring the current of the outdoor fan for multiple times within a second preset time after the last defrosting is finished;
and calculating the average value of the obtained currents of the outdoor fans, namely the preset current.
4. The defrost control method of claim 2, further comprising:
under the condition that the first ratio is smaller than or equal to the first preset ratio, further acquiring the duration of the current heating operation of the air conditioning unit;
and if the duration of the current heating operation of the air conditioning unit reaches a third preset duration, enabling the air conditioning unit to operate in a defrosting mode.
5. The defrosting control method according to any one of claims 2 to 4, wherein the step of selectively operating the air conditioning unit in the defrosting mode according to the current outdoor temperature and the outlet air temperature of the outdoor unit specifically includes:
calculating the ratio of a preset difference value to the difference value between the current outdoor temperature and the air outlet temperature of the outdoor unit, and recording the ratio as a second ratio;
comparing the second ratio with a second preset ratio;
and selectively enabling the air conditioning unit to operate in a defrosting mode according to the comparison result of the second ratio and the second preset ratio.
6. The defrost control method according to claim 5, wherein the step of selectively operating the air conditioning unit in the defrost mode according to the comparison of the second ratio with the second preset ratio comprises:
and if the second ratio is larger than the second preset ratio, enabling the air conditioning unit to operate in a defrosting mode.
7. The defrost control method according to claim 6, wherein the step of selectively operating the air conditioning unit in the defrost mode according to the comparison of the second ratio with the second preset ratio comprises:
if the second ratio is smaller than or equal to the second preset ratio, further acquiring the duration of the current heating operation of the air conditioning unit;
and if the duration of the current heating operation of the air conditioning unit reaches a fourth preset duration, enabling the air conditioning unit to operate in a defrosting mode.
8. The defrost control method of claim 5, wherein the predetermined difference is determined by:
acquiring the air outlet temperature of the outdoor unit and at least acquiring the outdoor temperature once for a plurality of times within a fifth preset time after the last defrosting is finished;
and calculating the difference value between the outdoor temperature and the average value of the obtained air outlet temperatures of the outdoor units, namely the preset difference value.
9. The defrost control method of claim 1, further comprising:
under the condition that the temperature of the outdoor coil is greater than the preset outdoor coil temperature, or the duration time of the temperature of the outdoor coil is less than or equal to the preset outdoor coil temperature does not reach the first preset duration time, further acquiring the duration time of the heating operation of the air conditioning unit;
and if the duration of the current heating operation of the air conditioning unit reaches a sixth preset duration, enabling the air conditioning unit to operate in a defrosting mode.
10. An air conditioning assembly characterized in that it comprises a controller capable of executing the defrost control method of any of claims 1-9.
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| CN202110426600.4A CN113124544B (en) | 2021-04-20 | 2021-04-20 | Air conditioning unit and defrosting control method thereof |
| PCT/CN2022/087808 WO2022222940A1 (en) | 2021-04-20 | 2022-04-20 | Air conditioning unit and defrosting control method therefor |
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| CN202110426600.4A CN113124544B (en) | 2021-04-20 | 2021-04-20 | Air conditioning unit and defrosting control method thereof |
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| WO2022222940A1 (en) * | 2021-04-20 | 2022-10-27 | 青岛海尔空调电子有限公司 | Air conditioning unit and defrosting control method therefor |
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| CN115978717B (en) * | 2022-11-25 | 2024-06-11 | 宁波奥克斯电气股份有限公司 | Defrosting method and air conditioner |
| CN115789866B (en) * | 2022-11-25 | 2024-06-11 | 宁波奥克斯电气股份有限公司 | Air conditioner heating defrosting control method and device, air conditioner and storage medium |
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| CN113124544B (en) | 2023-04-25 |
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