CN113883678A - Noise control method for air conditioner and air conditioner - Google Patents
Noise control method for air conditioner and air conditioner Download PDFInfo
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- CN113883678A CN113883678A CN202111129509.2A CN202111129509A CN113883678A CN 113883678 A CN113883678 A CN 113883678A CN 202111129509 A CN202111129509 A CN 202111129509A CN 113883678 A CN113883678 A CN 113883678A
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- 238000000034 method Methods 0.000 title claims abstract description 78
- 238000001228 spectrum Methods 0.000 claims abstract description 58
- 239000003507 refrigerant Substances 0.000 claims abstract description 52
- 238000010183 spectrum analysis Methods 0.000 claims abstract description 8
- 238000004781 supercooling Methods 0.000 claims description 25
- 230000007613 environmental effect Effects 0.000 claims description 21
- 230000001143 conditioned effect Effects 0.000 claims description 14
- 239000003570 air Substances 0.000 description 123
- 239000007788 liquid Substances 0.000 description 26
- 238000005057 refrigeration Methods 0.000 description 13
- 238000001816 cooling Methods 0.000 description 7
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 208000016354 hearing loss disease Diseases 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 210000000653 nervous system Anatomy 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
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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
- F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
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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
- F24F11/52—Indication arrangements, e.g. displays
- F24F11/526—Indication arrangements, e.g. displays giving audible indications
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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
- F24F11/72—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
- 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
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
Abstract
The invention relates to a noise control method for an air conditioner and the air conditioner. The noise control method includes: detecting noise of the indoor unit through a first noise sensor; comparing the measured noise of the indoor unit with a preset noise threshold value; when the noise of the indoor unit is larger than the preset noise threshold value and keeps for a first preset time period, performing spectrum analysis on the noise of the indoor unit to obtain a characteristic spectrum value; comparing the characteristic spectrum value with a preset spectrum interval to determine the noise category; and controlling the air conditioner in a corresponding noise control mode according to the determined noise category, wherein the corresponding noise control mode comprises a refrigerant sound control mode, an oil return sound control mode and a fan sound control mode. By adopting the noise control method, the air conditioner can comprehensively and accurately control the noise of the indoor unit according to different noise types, reduce the noise of the indoor unit and improve the use experience of users.
Description
Technical Field
The invention relates to an air conditioning system, in particular to a noise control method for an air conditioner and the air conditioner.
Background
Air conditioners generally refer to devices that manually adjust and control parameters such as temperature, humidity, and flow rate of ambient air in a room to be conditioned. An air conditioner generally includes an indoor unit installed in a conditioned room and an outdoor unit disposed outdoors. Indoor units disposed in a conditioned room are generally provided with an air intake and an air outlet. An air extracting or blowing device (e.g., a cross-flow fan) in the air conditioner sucks air in the conditioned room (which is generally called "return air") or fresh air outside the room into the air conditioner through an air inlet. The air is cooled or heated in the air conditioner by flowing over a heat exchanger arranged in the air conditioner. The cooled or heated air is then delivered to the conditioned room through the outlet vents. In the case where the air conditioner has at least cooling and heating functions, cold air (for example, summer) or hot air (for example, winter) can be blown out from the outlet port according to actual needs.
The air conditioner brings great convenience to production and life of people, and simultaneously, a plurality of problems are generated. Among them, the noise problem has been a difficult and painful point to the user. In the use process of the air conditioner, both the outdoor unit and the indoor unit generate noise. Relatively speaking, the outdoor unit noise has less influence on the user due to blocking by walls, windows, and the like, while the indoor unit noise has greater influence on the user. Once the noise of the indoor unit is too loud, the user feels uncomfortable, and the normal rest and sleep of the user are affected. Hearing impairment and nervous system damage can also result if the user is left in a noisy environment for extended periods of time.
A control method for reducing noise of an indoor unit has been developed in the prior art. For example, chinese patent application CN113203165A discloses a noise reduction control method and device for a multi-connected air conditioner, and a multi-connected air conditioner. The noise reduction control method comprises the following steps: when the multi-connected air conditioner exits the oil return stage, controlling a heat exchange assembly between an outdoor unit expansion valve and an indoor unit expansion valve to operate; monitoring the actual supercooling degree of the multi-connected air conditioner; when the actual supercooling degree is smaller than the preset supercooling degree, the actual supercooling degree is controlled to be increased to be larger than or equal to the preset supercooling degree based on the heat exchange assembly, so that the refrigerant entering the indoor unit is in a liquid state, and the problem that the noise is generated by the refrigerant due to insufficient supercooling is solved. However, the noise reduction control method is only suitable for controlling the noise of the indoor unit after the oil return stage is finished, and the application range is small. The reasons for generating the noise of the indoor unit are various, and a method for comprehensively and accurately controlling the reasons for generating different noises is lacked in the prior art.
Accordingly, there is a need in the art for a new solution to the above problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the technical problem in the prior art that the noise of the indoor unit of the air conditioner cannot be controlled comprehensively and precisely, the present invention provides a noise control method for an air conditioner. The noise control method includes:
detecting noise of the indoor unit through a first noise sensor;
comparing the measured noise of the indoor unit with a preset noise threshold value;
when the noise of the indoor unit is larger than the preset noise threshold value and keeps for a first preset time period, performing spectrum analysis on the noise of the indoor unit to obtain a characteristic spectrum value;
comparing the characteristic spectrum value with a preset spectrum interval to determine the noise category;
and controlling the air conditioner in a corresponding noise control mode according to the determined noise category, wherein the corresponding noise control mode comprises a refrigerant sound control mode, an oil return sound control mode and a fan sound control mode.
It can be understood by those skilled in the art that, in the noise control method for an air conditioner of the present invention, the noise of the indoor unit can be conveniently and accurately detected by the first noise sensor, and the control accuracy is improved. And comparing the measured noise of the indoor unit with a preset noise threshold value. When the noise of the indoor unit is greater than the preset noise threshold and is kept for the first preset time period, the noise of the indoor unit is larger and lasts for a longer time, and the indoor unit needs to be controlled so as not to influence a user. The noise of the indoor unit is subjected to spectrum analysis, and a characteristic spectrum value can be conveniently obtained. And comparing the acquired characteristic frequency spectrum value with a preset frequency spectrum interval so as to determine the category of the noise. According to the determined noise type, the air conditioner is controlled in the corresponding noise control mode, so that not only can the noise of the indoor unit be comprehensively controlled, but also the pertinence of noise control can be enhanced, and the control precision is improved. The corresponding noise control modes comprise a refrigerant sound control mode, an oil return sound control mode and a fan sound control mode, and the noise control modes respectively correspond to three noise categories of refrigerant noise, oil return noise and fan noise. The noise of the indoor unit is reduced in a targeted manner through the corresponding noise control mode, so that the noise is controlled within a preset range, and the use experience of a user is improved.
In a preferred embodiment of the above noise control method for an air conditioner, the preset frequency spectrum interval includes:
the frequency range of the refrigerant audio frequency spectrum interval is more than or equal to 500Hz and less than 2500 Hz;
the frequency range of the oil return audio spectrum interval is more than or equal to 2500Hz and less than 5000 Hz; and
and the frequency range of the fan audio frequency spectrum interval is more than or equal to 70Hz and less than 100 Hz. Through the setting, the noise type can be conveniently determined, and the control precision is improved.
In a preferred embodiment of the above noise control method for an air conditioner, the air conditioner includes an economizer, and the refrigerant sound control mode includes:
controlling a supercooling valve of the economizer to increase the opening of a preset supercooling valve;
after a second preset time period, detecting the temperature of the coil pipe of the indoor unit;
after the second preset time period, the temperature of the coil pipe is detected again;
comparing the coil temperature re-measured with the coil temperature previously measured;
if a first temperature difference value between the coil temperature measured again and the coil temperature measured last time is smaller than or equal to a first preset temperature difference value, keeping the opening degree of the supercooling valve at present;
and if the first temperature difference value is larger than the first preset temperature difference value, repeatedly controlling the supercooling valve of the economizer to increase the opening degree of the preset supercooling valve. When the air conditioner comprises the economizer, the supercooling degree can be improved by increasing the opening degree of the supercooling valve of the economizer, the refrigerant flowing into the indoor unit is ensured to be in a liquid state, and the generation of refrigerant noise caused by the flow of gaseous refrigerant in a refrigerant pipeline of the indoor unit is prevented. In addition, the opening degree of the supercooling valve is controlled based on the comparison result of the first temperature difference value between the coil temperature measured at the next time and the coil temperature measured at the previous time and the first preset temperature difference value by repeatedly detecting the coil temperature of the indoor unit, so that the control efficiency of the supercooling degree can be improved, and the control precision of the refrigerant sound control mode is improved.
In a preferred embodiment of the above noise control method for an air conditioner, the air conditioner is configured to cancel an economizer, and the refrigerant sound control mode includes:
detecting the temperature of the coil;
comparing the measured coil temperature to a target coil temperature;
when the temperature of the coil is smaller than a second temperature difference value between the target temperature of the coil and a second preset temperature value, acquiring the opening degree of an expansion valve of the air conditioner;
comparing the acquired opening degree of the expansion valve with a preset minimum opening degree;
if the opening degree of the expansion valve is larger than the preset minimum opening degree, controlling the expansion valve to reduce the opening degree of the preset expansion valve;
and if the opening degree of the expansion valve is smaller than or equal to the preset minimum opening degree, keeping the current opening degree of the expansion valve. When no economizer is arranged in the air conditioner, the opening degree of an expansion valve of the indoor unit is controlled by detecting the coil temperature of the indoor unit and based on a comparison result of a coil temperature and a second temperature difference value (namely, a difference value between a target coil temperature and a second preset temperature), so that the refrigerant quantity in a refrigeration system can be reduced on the basis of meeting the refrigeration requirement, and the noise generated when a gaseous refrigerant flows through the indoor unit is further reduced.
In a preferred embodiment of the noise control method for an air conditioner, when the temperature of the coil is greater than or equal to the second temperature difference, the opening degree of the expansion valve is maintained. Through the arrangement, the refrigerant quantity in the refrigeration system can be preferentially ensured to meet the refrigeration requirement.
In a preferred technical solution of the above noise control method for an air conditioner, when the air conditioner is in an oil return mode, the oil return sound control mode includes:
detecting ambient noise in the conditioned room by a second noise sensor;
comparing the measured ambient noise with the noise of the indoor unit;
when the environmental noise is larger than or equal to the noise of the indoor unit, controlling the air conditioner to continuously return oil;
and when the environmental noise is smaller than the noise of the indoor unit and a third preset time period is kept, controlling the air conditioner to stop oil return. Through the arrangement, the air conditioner can return oil when the environmental noise is larger than the noise of the indoor unit, so that a user is not easy to perceive the noise generated by the oil return, and the influence of the oil return noise on the user is reduced to the maximum extent.
In the preferable technical scheme of the noise control method for the air conditioner, after the air conditioner is controlled to stop oil return,
re-detecting the ambient noise after a fourth preset time period;
comparing the re-measured ambient noise with the noise of the indoor unit;
if the re-measured environmental noise is larger than the noise of the indoor unit, controlling the air conditioner to continuously return oil;
and if the re-measured environmental noise is less than or equal to the noise of the indoor unit, repeating the step of detecting the environmental noise. Through the arrangement, the air conditioning system can continue oil return when the condition is met (namely the re-measured environmental noise is larger than the noise of the indoor unit), and the influence of oil return noise on a user is reduced while the oil return is met.
In a preferred embodiment of the above noise control method for an air conditioner, the control method further includes:
recording the running time of the air conditioner after the oil return of the air conditioner is stopped last time;
comparing the running time with a preset time;
and when the running time is more than or equal to the preset time, controlling the air conditioner to forcibly return oil. When the running time after the oil return is stopped is longer than or equal to the preset time, the air conditioner is controlled to force the oil return to meet the oil return requirement if the air conditioner cannot finish the oil return smoothly in a longer time.
In a preferred embodiment of the above noise control method for an air conditioner, the fan sound control mode includes:
acquiring the rotating speed of a fan of the indoor unit;
comparing the rotating speed of the fan with a preset minimum rotating speed;
if the rotating speed of the fan is greater than the preset lowest rotating speed, controlling the fan to reduce the preset rotating speed;
if the rotating speed of the fan is less than or equal to the preset lowest rotating speed, the current rotating speed of the fan is kept, and a fan fault alarm is sent. When the rotating speed of the fan is greater than the preset lowest rotating speed, the rotating speed of the fan of the indoor unit is higher, and the noise of the fan can be reduced by reducing the rotating speed of the fan. When the rotating speed of the fan is less than the preset minimum rotating speed, the rotating speed of the fan of the indoor unit is lower, if the rotating speed of the fan is reduced, the normal operation of the refrigeration system is possibly influenced, the air supply efficiency is also reduced, and therefore the current rotating speed of the fan is maintained. In addition, a fan fault alarm is given out, so that a user can be reminded of cleaning, maintaining and replacing the indoor fan in time, and the problem of fan noise is fundamentally solved.
In order to solve the above problems in the prior art, that is, to solve the technical problem in the prior art that the noise control of the indoor unit of the air conditioner cannot realize the precision control, the invention further provides an air conditioner. The air conditioner controls the noise of the indoor unit by adopting the noise control method for the air conditioner according to any one of the above. By adopting any one of the noise control methods for the air conditioner, the air conditioner can comprehensively and accurately control the noise of the indoor unit according to different noise types, reduce the noise of the indoor unit and improve the use experience of users.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
fig. 1 is a system configuration diagram of an air conditioner of the present invention;
FIG. 2 is a flow chart of a noise control method for an air conditioner according to the present invention;
fig. 3 is a flowchart of an embodiment of a noise control method for an air conditioner according to the present invention.
FIG. 4 is a flowchart illustrating an exemplary embodiment of a refrigerant sound control mode in the noise control method for an air conditioner according to the present invention;
FIG. 5 is a flowchart of a first embodiment of a return oil sound control mode in the noise control method for an air conditioner according to the present invention;
fig. 6 is a flowchart of a second embodiment of a return oil sound control mode in the noise control method for an air conditioner according to the present invention;
fig. 7 is a flowchart of an embodiment of a fan tone control mode in a noise control method for an air conditioner according to the present invention.
List of reference numerals:
1. an air conditioner; 10. an outdoor unit; 11. a compressor; 111. an exhaust port; 112. an air suction port; 12. a four-way valve; 13. an outdoor heat exchanger; 14. an outdoor fan; 15. an outdoor electronic expansion valve; 16. an economizer; 161. an over-cooling valve; 162. a heat exchanger; 17. a gas-liquid separator; 18. a liquid pipe stop valve; 19. an air pipe stop valve; 20. an indoor unit; 20a, a first indoor unit; 20b, a second indoor unit; 21. an indoor heat exchanger; 22. an indoor fan; 23. a temperature sensor; 24. an indoor electronic expansion valve; 25. a first noise sensor; 30. a refrigerant pipeline; 31. an exhaust pipe; 32. a liquid pipe; 33. a gas pipe; 34. an air intake duct; 35. a bypass branch.
Detailed Description
Preferred embodiments of the present invention are described below with reference to 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.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "top", "bottom", etc. are based on the directions or positional relationships shown in the drawings, which are for convenience of description only, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; either directly or indirectly through intervening media, or through the communication 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.
The invention provides a noise control method for an air conditioner, aiming at solving the technical problem that the noise control of an indoor unit of the air conditioner in the prior art can not realize precision control. The control method comprises the following steps:
detecting noise of the indoor unit by a first noise sensor (step S1);
comparing the measured noise of the indoor unit with a preset noise threshold (step S2);
when the noise of the indoor unit is greater than a preset noise threshold and keeps a first preset time period, performing spectrum analysis on the noise of the indoor unit to obtain a characteristic spectrum value (step S3);
comparing the characteristic spectrum value with a preset spectrum interval to determine a noise class (step S4);
according to the determined noise type, the air conditioner is controlled in a corresponding noise control mode, wherein the corresponding noise control mode comprises a refrigerant sound control mode, an oil return sound control mode and a fan sound control mode (step S5).
Fig. 1 is a system configuration diagram of an embodiment of an air conditioner of the present invention. As shown in fig. 1, in one or more embodiments, the air conditioner 1 of the present invention includes an outdoor unit 10 (which is typically disposed in an outdoor environment) and 2 parallel indoor units 20 (which are typically disposed indoors or in a room). The indoor units 20 connected in parallel are a first indoor unit 20a and a second indoor unit 20b, respectively. Alternatively, the air conditioner 1 may have 1, 3, or other suitable number of indoor units. The configuration of each indoor unit 20 may be the same or different according to actual needs.
As shown in fig. 1, in one or more embodiments, the outdoor unit 10 mainly includes a compressor 11, a four-way valve 12, an outdoor heat exchanger 13, an outdoor electronic expansion valve 15, and a gas-liquid separator 17. In one or more embodiments, the indoor unit 20 mainly includes an indoor heat exchanger 21, an indoor electronic expansion valve 24, and the like. The outdoor unit 10 and the indoor units 20 are interconnected by refrigerant pipes 30 to form a refrigeration circuit for allowing a refrigerant to flow therethrough. Specifically, the compressor 11 has a discharge port 111 and a suction port 112. The discharge port 111 of the compressor 11 is connected to the D port of the four-way valve 12 through a discharge pipe 31. The C port of the four-way valve 12 is connected to the input end of the outdoor heat exchanger 13. The output end of the outdoor heat exchanger 13 is connected to the outdoor electronic expansion valve 15, the indoor electronic expansion valve 24 and the indoor heat exchanger 21 in this order through the liquid pipe 32. The indoor heat exchanger 21 is connected to an E port of the four-way valve 12 through a gas pipe 33. The S port of the four-way valve 12 is connected to the gas inlet of the gas-liquid separator 17. The outlet of the gas-liquid separator 17 is connected to the suction port 112 of the compressor 11 through the suction pipe 34 so as to be interconnected to form a refrigeration cycle, and the air conditioner 1 can be switched between a cooling mode and a heating mode by means of the four-way valve 12.
With continued reference to FIG. 1, in one or more embodiments, the compressor 11 is a screw compressor. Alternatively, the compressor 11 may be a centrifugal compressor, a scroll compressor, or other suitable compressor. Further, the compressor 11 may be configured as two or more compressors connected in parallel. The configuration of each compressor 11 may be the same or different, depending on the actual requirements.
With continued reference to fig. 1, in one or more embodiments, the outdoor heat exchanger 13 is a finned coil heat exchanger. Alternatively, the outdoor heat exchanger 13 may be a plate heat exchanger or other suitable heat exchanger. An outdoor fan 14 is further disposed at a position close to the outdoor heat exchanger 13 to improve the heat exchange efficiency of the outdoor heat exchanger 13.
With continued reference to fig. 1, in one or more embodiments, a liquid tube shutoff valve 18 is provided on the liquid tube 32 between the outdoor electronic expansion valve 15 and the indoor electronic expansion valve 24, and a gas tube shutoff valve 19 is also provided on the gas tube 33 between the E-junction of the four-way valve 12 and the indoor heat exchanger 21. The liquid pipe shutoff valve 18 and the gas pipe shutoff valve 19 are configured to be normally open and closable in the case of attachment, detachment, maintenance, or the like, so that the refrigerant in the refrigeration circuit is temporarily stored outside the room.
As shown in fig. 1, in one or more embodiments, the indoor heat exchanger 21 is a fin-and-coil heat exchanger. Alternatively, the indoor heat exchanger 21 may be a plate heat exchanger or other suitable heat exchanger. An indoor fan 22 is further disposed at a position close to the indoor heat exchanger 21 to improve the heat exchange efficiency of the indoor heat exchanger 21. In one or more embodiments, a temperature sensor 23 is provided adjacent to the indoor heat exchanger 21 to detect the coil temperature of the indoor heat exchanger 21. In one or more embodiments, a first noise sensor 25 for detecting noise of the indoor unit 20 is further disposed on a casing (not shown) of the indoor unit 20 and near the outlet. Alternatively, the first noise sensor 25 may be disposed at other suitable positions of the indoor unit 20. In one or more embodiments, the air conditioner 1 is further provided with a second noise sensor (not shown) for detecting ambient noise in the room to be conditioned. The second noise sensor may be disposed on a remote controller (not shown) of the air conditioner 1, an indoor line controller, or other suitable location.
In one or more embodiments, as shown in fig. 1, the air conditioner 1 of the present invention further includes an economizer 16 disposed in the bypass branch 35. One end of the bypass branch 35 is connected to the liquid pipe 32 between the outdoor electronic expansion valve 15 and the liquid-pipe shutoff valve 18, and the other end of the bypass branch 35 is connected to the gas inlet of the gas-liquid separator 17. The economizer 16 includes an subcooling valve 161 and a heat exchanger 162. The supercooling valve 161 can adjust the flow rate of the refrigerant flowing into the bypass line 35, and perform an expansion and pressure reduction function. In one or more embodiments, the heat exchanger 162 is a plate heat exchanger having four ports. Based on the orientation shown in fig. 1, the first port (located at the upper right of the heat exchanger 162) is connected to the subcooling valve 161, the second port (located at the upper left of the heat exchanger 162) is connected to the air inlet of the gas-liquid separator 17, the third port (located at the lower left of the heat exchanger 162) is connected to the outdoor electronic expansion valve 15, and the fourth port (located at the lower right of the heat exchanger 162) is connected to the liquid-pipe shutoff valve 18. The first interface is communicated with the second interface, and the third interface is communicated with the fourth interface. With the above configuration, the liquid refrigerant condensed by the outdoor heat exchanger 13 may be divided into two paths, the first path flows from the third port to the fourth port rightward along the liquid pipe 32, and the second path flows from the first port to the second port leftward along the bypass branch 35. The refrigerant flowing reversely can improve the heat exchange efficiency. The liquid refrigerant in the second path is expanded and throttled by the cold valve 161 to form a low-temperature and low-pressure liquid refrigerant, and the low-temperature and low-pressure liquid refrigerant enters the heat exchanger 162 through the first interface; in the heat exchanger 162, the low-temperature and low-pressure refrigerant in the second path absorbs heat from the high-temperature and high-pressure (or medium-pressure) liquid refrigerant in the first path, evaporates into gas, and then leaves the heat exchanger 162 from the second port and flows to the gas-liquid separator 17. The gaseous refrigerant can be sucked and compressed again by the compressor 11 after flowing to the gas-liquid separator 17, so that the suction amount of the compressor 11 is increased, and the compression efficiency is improved. In contrast, the temperature of the liquid refrigerant in the first path is reduced in the heat exchanger 162 by transferring heat to the liquid refrigerant in the second path, thereby increasing the supercooling degree. Alternatively, the heat exchanger 162 may be a double pipe heat exchanger or other suitable heat exchanger.
The noise control method for an air conditioner according to the present invention will be described in detail based on the air conditioner 1. It should be noted that the noise control method for an air conditioner of the present invention can also be applied to other suitable refrigeration equipment.
Fig. 2 is a flowchart of a noise control method for an air conditioner according to the present invention. As shown in fig. 2, after the noise control method for an air conditioner according to the present invention is started, step S1 is performed, in which the noise of the indoor unit 20 is detected by the first noise sensor 25. In one or more embodiments, the first noise sensor 25 is configured to be electrically connected to a control system (not shown) of the air conditioner 1 such that the first noise sensor 25 can transmit a detected noise signal to the control system. Next, step S2 is executed to compare the measured noise of the indoor unit 20 with a preset noise threshold. In one or more embodiments, the predetermined noise threshold is 44 db. Alternatively, the preset noise threshold may be set to other suitable decibel values higher or lower than 44 db. When the noise of the indoor unit 20 is greater than the preset noise threshold and is maintained for the first preset time period, performing spectrum analysis on the noise of the indoor unit 20 to obtain a characteristic spectrum value (step S3). In one or more embodiments, a noise test analysis program (not shown) is integrated in the control system of the air conditioner 1 to perform a spectrum analysis of the noise of the indoor unit 20. It is noted that the nature of the noise is the sound waves generated by the vibration of the object. Different noise classes correspond to different sound wave frequencies, i.e. to different characteristic spectral values. In one or more embodiments, the first preset time period is 1min (minute). Alternatively, the first preset time period may be set to other suitable times longer or shorter than 1 min. Then, step S4 is executed to compare the characteristic spectrum values with a preset spectrum interval to determine the noise class. In one or more embodiments, the preset frequency spectrum interval includes a refrigerant audio frequency spectrum interval, an oil return audio frequency spectrum interval, and a fan audio frequency spectrum interval. The frequency range of the refrigerant audio spectrum interval is greater than or equal to 500Hz (Hertz) and less than 2500Hz, the frequency range of the oil return audio spectrum interval is greater than or equal to 2500Hz and less than 5000Hz, and the frequency range of the fan audio spectrum interval is greater than or equal to 70Hz and less than 100 Hz. The frequency range corresponding to each preset frequency spectrum interval can be adjusted according to actual needs. After the noise type is determined, the control method proceeds to step S5, where the air conditioner 1 is controlled in a corresponding noise control mode including a refrigerant sound control mode, a return sound control mode, and a fan sound control mode according to the determined noise type.
Fig. 3 is a flowchart of an embodiment of a noise control method for an air conditioner according to the present invention. As shown in fig. 3, in one or more embodiments, after the noise control method for an air conditioner according to the present invention is started, step S1 is performed to detect the noise of the indoor unit 20 through the first noise sensor 25. Next, step S21 is executed to determine whether the noise of the indoor unit 20 is greater than the preset noise threshold and keeps for a first preset time period. If the result of the determination is negative, which indicates that the noise of the indoor unit 20 is small at this time and the influence on the user is small, step S1 is repeatedly executed. If the determination result is yes, which indicates that the noise of the indoor unit 20 is large and continues for a long time, step S31 is executed, in which the noise of the indoor unit 20 is subjected to spectrum analysis to obtain a characteristic spectrum value. Then, the control method proceeds to step S41, where it is determined whether the characteristic spectrum value falls within the refrigerant audio spectrum interval. When the characteristic spectrum value falls within the refrigerant sound frequency spectrum interval, it indicates that the refrigerant sound is the main cause of generating the loud noise of the indoor unit 20, and therefore the air conditioner 1 is controlled to enter the refrigerant sound control mode (step S51). When step S51 is complete, control ends.
With continued reference to fig. 3, in one or more embodiments, when the characteristic spectrum value does not fall into the refrigerant-audio spectrum interval, step S42 is executed to determine whether the characteristic spectrum value falls into the return-audio spectrum interval. When the characteristic spectrum value falls within the oil return tone spectrum interval, it indicates that the oil return tone is the main cause of generating a large noise of the indoor unit 20, and therefore the air conditioner 1 is controlled to enter the oil return tone control mode (step S52). When step S52 is complete, control ends.
With continued reference to fig. 3, in one or more embodiments, when the characteristic spectrum value does not fall within the oil return audio spectrum interval, step S43 is performed, i.e., it is determined whether the characteristic spectrum value falls within the fan-audio spectrum interval. When the characteristic spectrum value falls within the fan sound frequency range, it indicates that the fan sound is the main cause of generating the loud noise of the indoor unit 20, and therefore the air conditioner 1 is controlled to enter the fan sound control mode (step S53). When step S53 is complete, control ends.
With continued reference to fig. 3, in one or more embodiments, when the characteristic spectrum value does not fall within the fan-audio spectrum interval, it is described that the noise of the indoor unit 20 is caused by other reasons, such as capacitive sound in the indoor unit 20. The noise is generated for a plurality of reasons, and the control means is limited, so that in order to take the cost of control into consideration, when the characteristic frequency spectrum value does not fall into the fan audio frequency spectrum interval, the control method is ended. It should be noted that the sequence of the steps of judging the characteristic frequency spectrum value and the refrigerant audio frequency spectrum interval, the return oil audio frequency spectrum interval and the fan audio frequency spectrum interval can also be adjusted according to actual needs. When the control method is finished, step S1 may be repeatedly executed, that is, the noise of the indoor unit 20 is detected again by the first noise sensor 25.
Fig. 4 is a flowchart illustrating an exemplary embodiment of a refrigerant sound control mode in a noise control method for an air conditioner according to the present invention. As shown in fig. 4, in one or more embodiments, after the condition for entering the cooling medium sound control mode is satisfied, step S511 is executed to determine whether the air conditioner 1 has the economizer 16. It is to be noted that whether or not the economizer 16 is provided in the air conditioner 1 is determined when the outdoor unit 10 is shipped from the factory. In one or more embodiments, dials (not shown) of a control system (typically a computer board) of the air conditioner 1 are provided corresponding to different models (i.e., two models, an external machine with an economizer and an external machine without an economizer). By the control system automatically recognizing these dials, a determination can be made as to whether the air conditioner 1 has the economizer 16.
As shown in fig. 4, after the step S511 is performed, if the determination result is yes, a step S121 of controlling the subcooling valve 161 of the economizer 16 to increase the preset subcooling valve opening degree is performed. In one or more embodiments, the subcooling valve opening is preset to 2 steps. Alternatively, the preset subcooling valve opening may be set to any other suitable opening that is more or less than 2 steps. Next, step S5122 is executed to detect the coil temperature of the indoor unit 20 after a second preset time period. The coil temperature of the indoor unit 20 can be obtained by a temperature sensor 23 disposed near the indoor heat exchanger 21. In one or more embodiments, the second preset time period is 1 min. Alternatively, the second preset time period may also be set to other suitable times longer or shorter than 1 min. Then, step S5123 is executed to re-detect the coil temperature after a second preset time period. After step S5123 is completed, the control method proceeds to step S5124 to determine whether the first temperature difference is less than or equal to a first preset temperature difference. Wherein the first temperature difference is the difference between the re-measured coil temperature and the previously measured coil temperature, i.e. the absolute value of the difference between the re-measured coil temperature and the previously measured coil temperature. In one or more embodiments, the first predetermined temperature difference is 0.2 ℃ (degrees celsius). Alternatively, the first preset temperature difference value may also be set to other suitable temperature values higher or lower than 0.2 ℃. If the determination result is yes, it means that the adjustment of the opening degree of the supercooling valve 161 has a small influence on the coil temperature of the indoor heat exchanger 21 and accordingly has a small influence on the supercooling degree in the refrigeration system, and the step S5125 is executed to maintain the current opening degree of the supercooling valve 161. When the step S5125 is completed, the control method exits the cooling medium sound control mode. If the determination result is negative, it indicates that the coil temperature of the indoor heat exchanger 21 can be affected by adjusting the opening of the subcooling valve 161, the step S5121 is repeated, and the subcooling valve 161 of the economizer 16 is continuously controlled to increase the preset opening of the subcooling valve, so as to increase the subcooling degree of the refrigeration system, ensure that the refrigerant flowing into the indoor unit 20 is a complete liquid refrigerant, and achieve the purpose of reducing the refrigerant noise.
As shown in fig. 4, after step S511 is executed, if the determination result is negative, that is, if the air conditioner 1 is not equipped with an economizer, step S5131 is executed, that is, the coil temperature of the indoor unit 20 is detected. Next, step S5132 is executed to determine whether the coil temperature is less than or equal to the second temperature difference. And the second temperature difference value is the difference value between the target coil temperature and a second preset temperature value. The second preset temperature value is an allowable deviation value lower than the target coil temperature. In one or more embodiments, the second preset temperature value is 3 ℃. Alternatively, the second preset temperature value may also be set to another suitable temperature value higher or lower than 3 ℃. If the determination result is yes, it indicates that the coil temperature of the indoor heat exchanger 21 of the indoor unit 20 is low at this time, step S5133 is executed to obtain the current opening degree of the expansion valve of the air conditioner 1. It should be noted that, unless explicitly stated to the contrary, the term "expansion valve" is used herein to refer to the indoor electronic expansion valve 24 of the indoor unit 20. Then, step S5134 is executed to determine whether the opening degree of the expansion valve is equal to or smaller than a preset minimum opening degree. In one or more embodiments, the preset minimum opening is 47 steps. Alternatively, the preset minimum opening may be set to other suitable openings more or less than 47 steps. After the step S5134, if the determination result is negative, it indicates that the opening degree of the indoor electronic expansion valve 24 is larger at this time, and the amount of the refrigerant flowing into the indoor heat exchanger 21 can be adjusted by decreasing the opening degree, so step S5135 is executed, i.e., the expansion valve is controlled to decrease the preset opening degree of the expansion valve, so as to achieve the purpose of reducing the refrigerant noise. In one or more embodiments, the expansion valve opening is preset to 3 steps. Alternatively, the preset expansion valve opening may be set to other suitable opening degrees more or less than 3 steps. After step S5135 is completed, the control method exits the cooling sound control mode.
With continued reference to fig. 4, in one or more embodiments, after step S5134 is performed, if the determination result is yes, which indicates that the opening degree of the indoor electronic expansion valve 24 is already small, the accuracy of the control is reduced if the opening degree is continuously adjusted, so step S5136 is performed, i.e., the current opening degree of the expansion valve is maintained. After step S5136 is completed, the control method exits the cooling sound control mode.
Continuing to refer to fig. 4, in one or more embodiments, after step S5132 is executed, if the determination result is negative, which indicates that the coil temperature of the indoor heat exchanger 21 of the indoor unit 20 is higher at this time, step S5136 is executed, in which the current opening degree of the expansion valve is maintained, so as to preferentially meet the cooling demand of the refrigeration system. After step S5136 is completed, the control method exits the cooling sound control mode.
Fig. 5 is a flowchart of a first embodiment of a return oil sound control mode in the noise control method for an air conditioner according to the present invention. As shown in fig. 5, in one or more embodiments, after the condition of the oil return sound control mode is satisfied, step S521 is performed, that is, when the air conditioner 1 is in the oil return mode, the ambient noise in the conditioned room is detected by the second noise sensor. Next, it is determined whether the ambient noise is equal to or less than the noise of the indoor unit 20 and is maintained for a third preset time period (step S522). If the judgment result is no, which indicates that the environmental noise in the conditioned room is large at this time and the oil return sound is not easily perceived by the user, step S5241 is executed to control the air conditioner 1 to continue oil return, thereby reducing the influence of the oil return noise on the user to the maximum extent. Then, step S5242 is executed to determine whether the oil return routine is ended. The condition for the oil-return procedure to end may be that the compressor 11 is operated at the oil-return frequency for an oil-return period. In one or more embodiments, the oil return frequency is 48Hz, and the oil return duration is 3 min. Alternatively, the oil return frequency may be set to other suitable frequencies higher or lower than 48 Hz. Further, the oil return time period may also be set to other suitable times longer or shorter than 3 min. When the condition for ending the oil return procedure is not satisfied, the step S5241 is repeatedly executed, and the air conditioner 1 is controlled to continue oil return. And when the condition of ending the oil return program is met, the control method exits the oil return sound control mode.
As shown in fig. 5, in one or more embodiments, after step S522 is executed, if the determination result is yes, which indicates that the environmental noise in the conditioned room is small at this time and the influence of the oil return noise on the user may be large, the air conditioner 1 is controlled to stop the oil return (step S5231). Next, step S5232 is executed to detect the environmental noise again after a fourth preset time period. In one or more embodiments, the fourth preset time period is 2 min. Alternatively, the fourth preset time period may also be set to other suitable times longer or shorter than 2 min. Then, it is determined whether or not the newly measured environmental noise is larger than the noise of the indoor unit 20 (step S5233). Note that "noise of the indoor unit 20" here refers to noise of the indoor unit 20 detected by the first noise sensor 25 in step S1. After step S5233 is executed, if the result of the determination is no, which indicates that the environmental noise in the room to be conditioned is still small, step S5232 is repeated, that is, the environmental noise is re-detected after the fourth preset time period. If the judgment result is yes, which indicates that the environmental noise in the room to be conditioned is large at this time, the air conditioner 1 is controlled to continue oil return (step S5234). Then, the control method proceeds to step S5235 to determine whether the oil return routine is ended. When the condition for ending the oil return procedure is not satisfied, step S5234 is repeatedly executed to control the air conditioner 1 to continue oil return. And when the condition of ending the oil return program is met, the control method exits the oil return sound control mode.
Fig. 6 is a flowchart of a second embodiment of a return oil sound control mode in the noise control method for an air conditioner according to the present invention. As shown in fig. 6, in one or more embodiments, after the condition of the oil-return sound control mode is satisfied, step S521 is performed, that is, when the air conditioner 1 is in the oil-return mode, the ambient noise in the conditioned room is detected by the second noise sensor. Next, it is determined whether the ambient noise is equal to or less than the noise of the indoor unit 20 and is maintained for a third preset time period (step S522). If the determination result is yes, the air conditioner 1 is controlled to stop oil return (step S5231). Then, step S5232 is executed to re-detect the ambient noise after a fourth preset time period. The control method proceeds to step S5233 to determine whether the newly measured environmental noise is larger than the noise of the indoor unit 20. In one or more embodiments, if the determination result is no, the control method proceeds to step S5236, i.e., the operation time period since the last oil return stop of the air conditioner 1 is recorded. Next, it is determined whether or not the operation time period is equal to or longer than a preset time period (step S5237). In one or more embodiments, the preset duration is 8 hours (hours). Alternatively, the preset time period may be set to be longer or shorter than 8h, or other suitable time. If the judgment result is no, the step S5232 is repeatedly executed, that is, the environmental noise is re-detected after the fourth preset time period elapses. If the judgment result is yes, it indicates that the compressor 11 runs in an oil shortage mode after the air conditioner 1 has run for a long time since the oil return was last stopped, and in order to meet the oil return requirement of the compressor 11, step S5238 is executed to control the air conditioner 1 to perform forced oil return, that is, the compressor 11 of the air conditioner 1 runs at the forced oil return frequency for a forced oil return time. In one or more embodiments, the forced oil return frequency is 60Hz, and the forced oil return duration is 30 s. Alternatively, the forced oil return frequency may be set to other suitable frequencies that are faster or slower than 60 Hz. Further, the forced oil return time period may be set to be longer or shorter than 30s or other suitable time. After completion of step S5238, the control method proceeds to step S5239, i.e., it is determined whether the forced oil return process is ended. When the end condition of the forced oil return is not met, that is, the duration of the forced oil return is not reached, step S5238 is repeatedly executed, and the air conditioner 1 is controlled to continue the forced oil return. And when the end condition of forced oil return is met, the control method exits the oil return sound control mode.
It should be noted that the parts of the second embodiment of the oil return sound control mode that are not mentioned may be configured to be the same as the first embodiment, and are not described herein again.
Fig. 7 is a flowchart of an embodiment of a fan tone control mode in a noise control method for an air conditioner according to the present invention. As shown in fig. 7, in one or more embodiments, when the condition of the fan tone control mode is satisfied, step S531 is performed, in which the fan rotation speed of the indoor unit 20 is obtained. It should be noted that, unless explicitly stated to the contrary, the term "fan of the indoor unit 20" refers to the indoor fan 22 in the indoor unit 20. Next, step S532 is executed to determine whether the fan rotation speed is greater than or equal to the preset minimum rotation speed. In one or more embodiments, the preset minimum speed is 700rpm (revolutions per minute). Alternatively, the preset minimum speed may be set to other suitable speeds faster or slower than 700 rpm. If the determination result is yes, which indicates that the rotation speed of the indoor fan 22 is faster at this time, the fan is controlled to decrease the preset rotation speed (step S533). In one or more embodiments, the predetermined speed is 20 rpm. Alternatively, the preset rotation speed is also set to other suitable rotation speed values more or less than 20 rpm. After step S533 is completed, the control method exits the air-conditioner sound control mode. After step S532, if the determination result is negative, it indicates that the rotation speed of the indoor fan 22 is slow, and if the fan rotation speed is continuously decreased, which may affect the normal operation of the refrigeration system, the air supply efficiency is also decreased, so step S534 is executed, i.e., the current fan rotation speed is maintained, and an air-out fault alarm is sent. In addition, the fan failure alarm is sent out, so that a user can be reminded of cleaning, maintaining and replacing the indoor fan 22 in time, and the problem of fan noise is fundamentally solved. After step S534 is completed, the control method exits the air-conditioner sound control mode.
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 easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. 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 noise control method for an air conditioner, the noise control method comprising:
detecting noise of the indoor unit through a first noise sensor;
comparing the measured noise of the indoor unit with a preset noise threshold value;
when the noise of the indoor unit is larger than the preset noise threshold value and keeps for a first preset time period, performing spectrum analysis on the noise of the indoor unit to obtain a characteristic spectrum value;
comparing the characteristic spectrum value with a preset spectrum interval to determine the noise category;
and controlling the air conditioner in a corresponding noise control mode according to the determined noise category, wherein the corresponding noise control mode comprises a refrigerant sound control mode, an oil return sound control mode and a fan sound control mode.
2. The noise control method for an air conditioner according to claim 1, wherein the preset frequency spectrum section includes:
the frequency range of the refrigerant audio frequency spectrum interval is more than or equal to 500Hz and less than 2500 Hz;
the frequency range of the oil return audio spectrum interval is more than or equal to 2500Hz and less than 5000 Hz; and
and the frequency range of the fan audio frequency spectrum interval is more than or equal to 70Hz and less than 100 Hz.
3. A noise control method for an air conditioner according to claim 1 or 2, wherein the air conditioner includes an economizer, and the refrigerant sound control mode includes:
controlling a supercooling valve of the economizer to increase the opening of a preset supercooling valve;
after a second preset time period, detecting the temperature of the coil pipe of the indoor unit;
after the second preset time period, the temperature of the coil pipe is detected again;
comparing the coil temperature re-measured with the coil temperature previously measured;
if a first temperature difference value between the coil temperature measured again and the coil temperature measured last time is smaller than or equal to a first preset temperature difference value, keeping the opening degree of the supercooling valve at present;
and if the first temperature difference value is larger than the first preset temperature difference value, repeatedly controlling the supercooling valve of the economizer to increase the opening degree of the preset supercooling valve.
4. The noise control method for an air conditioner according to claim 1 or 2, wherein the air conditioner cancels an economizer, and the refrigerant sound control mode includes:
detecting the temperature of the coil;
comparing the measured coil temperature to a target coil temperature;
when the temperature of the coil is smaller than a second temperature difference value between the target temperature of the coil and a second preset temperature value, acquiring the opening degree of an expansion valve of the air conditioner;
comparing the acquired opening degree of the expansion valve with a preset minimum opening degree;
if the opening degree of the expansion valve is larger than the preset minimum opening degree, controlling the expansion valve to reduce the opening degree of the preset expansion valve;
and if the opening degree of the expansion valve is smaller than or equal to the preset minimum opening degree, keeping the current opening degree of the expansion valve.
5. The noise control method for an air conditioner according to claim 4, wherein when the coil temperature is equal to or greater than the second temperature difference value, the opening degree of the expansion valve is maintained at the present time.
6. The noise control method for an air conditioner according to claim 1 or 2, wherein when the air conditioner is in an oil return mode, the oil return sound control mode includes:
detecting ambient noise in the conditioned room by a second noise sensor;
comparing the measured ambient noise with the noise of the indoor unit;
when the environmental noise is larger than or equal to the noise of the indoor unit, controlling the air conditioner to continuously return oil;
and when the environmental noise is smaller than the noise of the indoor unit and a third preset time period is kept, controlling the air conditioner to stop oil return.
7. The noise control method for an air conditioner according to claim 6, wherein, after controlling the air conditioner to stop oil return,
re-detecting the ambient noise after a fourth preset time period;
comparing the re-measured ambient noise with the noise of the indoor unit;
if the re-measured environmental noise is larger than the noise of the indoor unit, controlling the air conditioner to continuously return oil;
and if the re-measured environmental noise is less than or equal to the noise of the indoor unit, repeating the step of detecting the environmental noise.
8. The noise control method for an air conditioner according to claim 7, wherein the control method further comprises:
recording the running time of the air conditioner after the oil return of the air conditioner is stopped last time;
comparing the running time with a preset time;
and when the running time is more than or equal to the preset time, controlling the air conditioner to forcibly return oil.
9. The noise control method for an air conditioner according to claim 1 or 2, wherein the fan tone control mode includes:
acquiring the rotating speed of a fan of the indoor unit;
comparing the rotating speed of the fan with a preset minimum rotating speed;
if the rotating speed of the fan is greater than the preset lowest rotating speed, controlling the fan to reduce the preset rotating speed;
if the rotating speed of the fan is less than or equal to the preset lowest rotating speed, the current rotating speed of the fan is kept, and a fan fault alarm is sent.
10. An air conditioner, characterized in that the air conditioner controls noise of the indoor unit using the noise control method for an air conditioner according to any one of claims 1 to 9.
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| CN115111711A (en) * | 2022-06-30 | 2022-09-27 | 四川长虹空调有限公司 | Method and device for controlling rotating speed of outdoor motor of variable frequency air conditioner |
| CN115597214A (en) * | 2022-10-26 | 2023-01-13 | 宁波奥克斯电气股份有限公司（Cn） | Air conditioner external fan control method and device, air conditioner and storage medium |
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| CN114484718A (en) * | 2022-01-14 | 2022-05-13 | 宁波奥克斯电气股份有限公司 | Air conditioner oil return control method and device and air conditioner |
| CN114484718B (en) * | 2022-01-14 | 2023-11-07 | 宁波奥克斯电气股份有限公司 | Air conditioner oil return control method and device and air conditioner |
| CN114608127A (en) * | 2022-01-26 | 2022-06-10 | 宁波奥克斯电气股份有限公司 | Control method and device for improving noise of indoor unit and air conditioner |
| CN114608127B (en) * | 2022-01-26 | 2023-10-20 | 宁波奥克斯电气股份有限公司 | Control method and device for improving noise of indoor unit and air conditioner |
| CN115111711A (en) * | 2022-06-30 | 2022-09-27 | 四川长虹空调有限公司 | Method and device for controlling rotating speed of outdoor motor of variable frequency air conditioner |
| CN115111711B (en) * | 2022-06-30 | 2023-10-24 | 四川长虹空调有限公司 | Method and device for controlling rotation speed of outdoor motor of variable-frequency air conditioner |
| CN115597214A (en) * | 2022-10-26 | 2023-01-13 | 宁波奥克斯电气股份有限公司（Cn） | Air conditioner external fan control method and device, air conditioner and storage medium |
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Effective date of registration: 20221116 Address after: 266101 Haier Industrial Park, 1 Haier Road, Laoshan District, Shandong, Qingdao Applicant after: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Applicant after: QINGDAO HAIER CENTRAL AIR CONDITIONER Co.,Ltd. Address before: 266555 No. 305, south of Tuanjie road and west of zonger Road, Huangdao District, Qingdao City, Shandong Province Applicant before: QINGDAO HAIER CENTRAL AIR CONDITIONER Co.,Ltd. |
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Application publication date: 20220104 |