CN107062580B - Control method for reducing noise of indoor unit of air conditioner and multi-split air conditioner - Google Patents
Control method for reducing noise of indoor unit of air conditioner and multi-split air conditioner Download PDFInfo
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- CN107062580B CN107062580B CN201710170316.9A CN201710170316A CN107062580B CN 107062580 B CN107062580 B CN 107062580B CN 201710170316 A CN201710170316 A CN 201710170316A CN 107062580 B CN107062580 B CN 107062580B
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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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B40/00—Subcoolers, desuperheaters or superheaters
- F25B40/02—Subcoolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
- F24F2013/247—Active noise-suppression
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention discloses a control method for reducing noise of an indoor unit of an air conditioner, wherein the air conditioner comprises an outdoor unit and the indoor unit, the indoor unit comprises an indoor unit expansion valve, the outdoor unit comprises a compressor and an outdoor heat exchanger, a subcooler is arranged between the outdoor heat exchanger and the indoor unit expansion valve, and the subcooler comprises a subcooler expansion valve; the control method comprises the following steps: s10, controlling the air conditioner to start in a refrigeration mode; and S20, controlling the opening EXV1 of the expansion valve of the subcooler and the opening EXV2 of the expansion valve of the indoor unit to establish the supercooling degree of the system and ensure the superheat degree of the indoor unit. The control method can reduce the cavitation noise of the indoor unit when the air conditioner starts to run, thereby effectively solving the problem of liquid flow noise of the indoor unit. The invention also discloses a multi-split air conditioner.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method for reducing noise of an indoor unit of an air conditioner. The invention also relates to a multi-split air conditioner.
Background
The importance of air conditioning to people's daily life and work is self-evident. People always expect the air conditioner to provide a quieter environment while enjoying the comfortable temperature and humidity provided by the air conditioner, and therefore, the control of the noise level of the indoor unit of the air conditioner by manufacturers is particularly important. However, when an air conditioner (especially a multi-split air conditioner) is started and operated in a cooling mode, because system parameters are not stable yet, the indoor unit always has liquid flow noise at the time of starting, and indoor comfort is poor.
Disclosure of Invention
In view of the above situation, a primary object of the present invention is to provide a control method for reducing noise of an indoor unit of an air conditioner, which can effectively solve the problem of noise of a liquid flow of the indoor unit when the air conditioner starts to operate in a cooling mode.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a control method for reducing noise of an indoor unit of an air conditioner comprises an outdoor unit and the indoor unit, wherein the indoor unit comprises an indoor unit expansion valve, the outdoor unit comprises a compressor and an outdoor heat exchanger, a subcooler is arranged between the outdoor heat exchanger and the indoor unit expansion valve, and the subcooler comprises a subcooler expansion valve; wherein the control method comprises the steps of:
s10, controlling the air conditioner to start in a refrigeration mode;
s20, controlling the opening EXV1 of the expansion valve of the subcooler and the opening EXV2 of the expansion valve of the indoor unit to establish the supercooling degree of the system and ensure the superheat degree of the indoor unit;
in step S20, the step of controlling the opening degree of the internal expansion valve includes controlling the internal expansion valve during the compressor initialization period:
initializing the internal machine expansion valve as EXV2 ═ X, wherein the value range of X is 0-480, and,
when the temperature in T is more than or equal to 22 ℃, the value range of X is 100-200;
when the temperature in T is less than 22 ℃, the value range of X is 0-99;
wherein, the inside T is the indoor environment temperature;
in step S20, the step of controlling the opening degree of the internal expansion valve further includes controlling the internal expansion valve after the compressor is initialized:
the opening degree EXV2 of the indoor unit expansion valve is controlled according to the indoor unit superheat degree, and the formula is as follows: EXV2 is the original opening of the indoor unit expansion valve + the change of superheat degree c, wherein the change of superheat degree is the actual superheat degree-the target superheat degree, c is a constant, and the target superheat degree is the target value of the indoor unit superheat degree;
wherein when the change of the superheat degree is larger than 0, the value range of c is 10-15; when the change of the superheat degree is less than or equal to 0, the value range of c is 2-6;
in step S20, the step of controlling the opening degree of the expansion valve of the subcooler further includes performing initialization control on the subcooler:
controlling the opening degree of the expansion valve of the subcooler according to the frequency of the compressor, wherein the formula is as follows: EXV1 ═ a × P, where a is a constant and P is the frequency of the compressor;
wherein, when the initial control is carried out on the subcooler, the value range of the target value T1 of the supercooling degree of the system is 0-20, and,
when T1 is less than or equal to 5, the value range of a is 7-12;
when T1 is more than 5, the value range of a is 0-6;
in step S20, the step of controlling the opening degree of the expansion valve of the subcooler further includes control after initialization of the subcooler:
the opening degree EXV1 of the expansion valve of the subcooler is controlled according to the supercooling degree of the system according to the following formula: EXV1 is the original opening of the expansion valve of the subcooler + the change of the supercooling degree b, wherein the change of the supercooling degree is the actual supercooling degree-the target supercooling degree, b is a constant, and the target supercooling degree is the target value of the supercooling degree of the system;
when the supercooling degree change is larger than 0, the value range of b is 6-9; preferably, b-8;
when the change of the supercooling degree is less than or equal to 0, the value range of b is 1-4;
in step S20, before performing initialization control on the subcooler, the method further includes, during the compressor initialization period: the opening degree of the subcooler expansion valve is 0.
Preferably, when the degree of supercooling change is > 0, b is 8;
when the supercooling degree change is less than or equal to 0, b is 2.
Preferably, in the step S20, the target value of the superheat degree of the internal machine is T2, and when the temperature in T is more than or equal to 22 ℃, the value range of T2 is 1-2; when the temperature in T is less than 22 ℃, the value range of T2 is 3-5; wherein, the inside T is the indoor environment temperature.
Preferably, when the degree of superheat variation > 0, c is 12;
when the change of the superheat degree is less than or equal to 0, c is 4.
Another object of the present invention is to provide a multi-split air conditioner, in which the flow noise of the indoor unit is low. The technical scheme is as follows:
a multi-split air conditioner comprises an outdoor unit and an indoor unit, wherein the indoor unit comprises an indoor unit expansion valve, the outdoor unit comprises a compressor and an outdoor heat exchanger, a subcooler is arranged between the outdoor heat exchanger and the indoor unit expansion valve, and the subcooler comprises a subcooler expansion valve; the multi-split air conditioner adopts any one of the control methods to control the noise of the indoor unit.
The control method of the invention can quickly establish the supercooling degree of the system and ensure the superheat degree of the inner machine through controlling the subcooler expansion valve and the inner machine expansion valve, thereby reducing the cavitation noise of the inner machine when the air conditioner starts to run, and further effectively solving the problem of the liquid flow noise of the inner machine.
Drawings
A preferred embodiment of the control method for reducing noise of an air conditioning indoor unit according to the present invention will be described below with reference to the accompanying drawings. In the figure:
fig. 1 is a schematic view of an air conditioning system according to a preferred embodiment of the control method for reducing noise of an indoor unit of an air conditioner according to the present invention;
FIG. 2 is a schematic control flow chart of the control method for reducing noise of the indoor unit of the air conditioner according to the present invention;
fig. 3 is a comparison graph of the actually measured noise level before and after the noise reduction is performed by the control method for reducing the noise of the indoor unit of the air conditioner.
Detailed Description
Aiming at the problem of liquid flow noise of the indoor unit of the air conditioner, the invention considers that the liquid flow noise can be divided into the following three parts according to the source of the liquid flow noise: fluid flow noise, flash noise, and cavitation noise.
The reason for generating fluid flow noise is that liquid is always kept in a liquid state in the throttling process of the valve, and liquid stress or turbulence directly impacts the regulating valve and the pipeline to generate noise. This noise is typically below 90db (a) and therefore may not be considered at design time and at control time.
The flash evaporation refers to that liquid is changed into mixed gas-liquid two-phase flow after being throttled by a valve, flash evaporation noise mainly comes from the deceleration and expansion of the two-phase flow, and the proportion of the flash evaporation noise in liquid flow noise of the indoor unit is not large, so that the flash evaporation noise can be not considered in the design and control process.
Cavitation noise is the primary source of fluid flow noise and is generated by bubble collapse during cavitation. When the pressure at the restriction is less than the vapor pressure PV corresponding to the liquid inlet temperature, the liquid begins to vaporize and bubbles are generated. The pressure of the gas-liquid two-phase flow leaving the throttling point is gradually recovered, and when the pressure is higher than the vapor pressure PV, the bubbles are crushed. The local pressure of the crushed air bubbles can reach 6500kgf/cm2Such high pressure surges to the valve trim can produce high noise and vibration, and can also result in severe cavitation of the valve trim. Generally, cavitation noise is the only form of hydrodynamic noise that exceeds the relevant regulatory limits.
Therefore, the main purpose of the control method of the invention is to solve the problem of cavitation noise of the indoor unit when the indoor unit is started.
Fig. 1 shows a schematic diagram of a preferred embodiment of an air conditioning system according to the control method of the present invention. As a preferred embodiment, the air conditioning system is a multi-split air conditioning system, which includes an outdoor unit and a plurality of indoor units, such as two indoor units 100 and 200 shown in the figure, the indoor units 100 and 200 respectively include indoor unit expansion valves 101 and 201, the outdoor unit includes a compressor 301 and an outdoor heat exchanger 303, a subcooler 304 is further disposed between the outdoor heat exchanger 303 and the indoor unit expansion valves 101 and 201, the subcooler 304 is disposed in the outdoor unit, for example, and the subcooler 304 includes a subcooler expansion valve 305. The outdoor unit further includes an oil separator 302 disposed in the outdoor unit, for example, between an outlet end of the compressor 301 and the four-way valve 306.
As shown in fig. 2, the control method for reducing noise of the indoor unit of the air conditioner of the present invention includes the steps of:
s10, controlling the air conditioner to start in a refrigeration mode;
and S20, controlling the opening EXV1 of the subcooler expansion valve 305 and the opening EXV2 of the indoor unit expansion valves 101 and 201 to quickly establish the system supercooling degree (the target value is T1) and ensure the indoor unit superheat degree (the target value is T2). For the multi-split air conditioner, the control is respectively carried out on each indoor unit so as to ensure the superheat degree of each indoor unit.
That is, the control method of the invention can quickly establish the supercooling degree of the system and ensure the superheat degree of the indoor unit by controlling the subcooler expansion valve and the indoor unit expansion valve, thereby reducing the cavitation noise of the indoor unit when the air conditioner starts to run, and further solving the problem of the liquid flow noise of the indoor unit at the starting time of the air conditioner. The control method is effective through experimental verification, and can obviously reduce the noise of the indoor unit.
Preferably, the step of controlling the opening degree of the subcooler expansion valve 305 in step S20 includes performing initial control of the subcooler 304:
the opening degree of the subcooler expansion valve 305 is controlled according to the frequency of the compressor 301 according to the formula: EXV1 is a P, where a is a constant and P is the frequency of the compressor 301.
In the present invention, the compressor 301 may be an inverter compressor or a fixed frequency compressor, but in actual work, experiments prove that the effect of the inverter compressor is more excellent. Specifically, the frequency P of the compressor 301 ranges from 15 to 80, and the EXV1 ranges from 0 to 480.
When the compressor frequency P is high, the amount of refrigerant passing through the subcooler 304 increases; when the compressor frequency P is low, the amount of refrigerant passing through the subcooler 304 is reduced, so that the opening degree of the subcooler expansion valve 305 and the compressor frequency P can be set up in a numerical relationship, and the subcooling degree of the system can be quickly set up at any frequency. In addition, the value range of the constant a in the formula can be determined through experiments.
Preferably, in step S20, when the initial control is performed on the subcooler 304, the value of the target value T1 of the subcooling degree of the system is in the range of 0 to 20, and,
when T1 is less than or equal to 5, the value range of a is 7-12;
when T1 is more than 5, the value range of a is 0-6.
Laboratory experiments prove that the value of a is determined in the range, so that a good noise reduction effect can be achieved.
Preferably, the step of controlling the opening degree of the subcooler expansion valve 305 in step S20 further includes a control after the initialization of the subcooler (the control at this time may be referred to as a normal control as compared to the previous initialization control), that is, after the initialization control of the subcooler 304 is completed, the normal control of the subcooler 304 is performed in the following manner:
the opening EXV1 of the subcooler expansion valve 305 is controlled according to the system subcooling degree according to the formula: EXV1 is the original opening of the expansion valve of the subcooler + the change of the supercooling degree b, wherein the change of the supercooling degree is the actual supercooling degree-the target supercooling degree, b is a constant, the value range can be determined through experiments, and the target supercooling degree is the target value of the supercooling degree of the system.
Preferably, the value range of the target value T1 of the supercooling degree of the system is 5-20. Experiments prove that when the supercooling degree of the system is too small, the noise of the internal machine becomes large, and therefore, the value of the target supercooling degree is determined to be in the range through experiments.
In the step, the value of the change of the supercooling degree is determined firstly, the opening degree of the expansion valve of the subcooler is adjusted based on the value of the change of the supercooling degree, and the adjustment amount is in positive correlation with the value of the change of the supercooling degree, so that the supercooling degree of the system can be adjusted towards the target supercooling degree, and the liquid flow noise of the indoor unit can be reduced.
Preferably, in step S20, when the supercooling degree variation is > 0, the value of b ranges from 6 to 9, and more preferably, b is 8;
when the supercooling degree change is less than or equal to 0, the value range of b is 1-4, and more preferably, b is 2.
Laboratory experiments prove that the value of b is determined in the range, so that a good noise reduction effect can be achieved.
Preferably, the step S20, before the initial control of the subcooler 304, further includes the control of the subcooler 304 during the initial period of the compressor 301: the opening degree of the subcooler expansion valve 305 is 0. That is, after the air conditioner is started in the cooling mode, a compressor initialization period is first performed, for example, for 1min, during which the subcooler expansion valve 305 is completely closed and not opened. After the compressor initialization period is finished, the initialization control of the subcooler 304 is restarted.
The preferred embodiment of the control step for rapidly establishing the supercooling degree of the system by controlling the subcooler 304 is described in detail above, so as to achieve the purpose of reducing the noise of the indoor unit liquid flow.
However, in the control method of the present invention, the subcooler 304 is controlled and the indoor unit expansion valve is also controlled to ensure the indoor unit superheat degree. A preferred embodiment of the control step of the expansion valve of the indoor unit will be described in detail below.
Preferably, in step S20, the step of controlling the opening degree of the internal expansion valve includes an initialization control of the internal expansion valve in the compressor initialization period, specifically including:
initializing an inner machine expansion valve as EXV2 ═ X, wherein the value range of X is 0-480, and when the temperature in T is more than or equal to 22 ℃, the value range of X is 100-200;
when the temperature in T is less than 22 ℃, the value range of X is 0-99;
wherein, the inside T is the indoor environment temperature.
That is, after the air conditioner is started in the cooling mode, the compressor is initialized for a time period, for example, 1min, and during the time period, the indoor unit expansion valve can be initialized and controlled, that is, the initial opening degree of the indoor unit expansion valve is determined according to the indoor ambient temperature, so as to ensure the superheat degree of the indoor unit.
Experiments prove that the initial value of the EXV2 is determined in the range, so that a good noise reduction effect can be achieved.
Preferably, in step S20, the step of controlling the opening degree of the internal expansion valve further includes controlling the internal expansion valve after the compressor is initialized (compared with the previous initialization control, the control at this time may be referred to as normal control), and specifically, the normal control may be performed as follows:
the opening degree EXV2 of the indoor unit expansion valve is controlled according to the indoor unit superheat degree, and the formula is as follows: the EXV2 is the original opening degree of the indoor unit expansion valve + the change of the degree of superheat, c, where c is a constant, the range of the change of the degree of superheat is determined through experiments, and the target degree of superheat is the target value of the degree of superheat of the indoor unit.
In the step, the value of the change of the superheat degree is determined firstly, the opening degree of the expansion valve of the indoor unit is adjusted based on the value of the change of the superheat degree, and the adjustment amount is in positive correlation with the value of the change of the superheat degree, so that the superheat degree of the indoor unit can be adjusted towards the target superheat degree quickly, and the reduction of the liquid flow noise of the indoor unit is facilitated.
Preferably, in the step S20, the target value of the superheat degree of the internal machine is T2, and when the temperature in T is more than or equal to 22 ℃, the value range of T2 is 1-2; when the temperature in T is less than 22 ℃, the value range of T2 is 3-5; wherein, the inside T is the indoor environment temperature. Experiments prove that the influence of the superheat degree of the internal machine on noise is large, so that the value of the target superheat degree is determined to be in the range through experiments.
That is, when the opening EXV2 of the indoor unit expansion valve is controlled according to the indoor unit superheat degree, different indoor unit superheat degrees are determined according to the indoor environment temperature, if the indoor environment temperature is high, the indoor unit superheat degree takes a smaller value, and if the indoor environment temperature is low, the indoor unit superheat degree takes a larger value, and experiments prove that the method is more favorable for reducing the liquid flow noise of the indoor unit.
Preferably, in step S20, when the opening degree EXV2 of the indoor unit expansion valve is controlled according to the indoor unit superheat degree, when the change in the superheat degree is > 0, the value of c ranges from 10 to 15, and more preferably, c is 12; when the change of the superheat degree is less than or equal to 0, the value of c ranges from 2 to 6, and c is more preferably 4.
Laboratory experiments prove that the value of c is determined in the range, so that a good noise reduction effect can be achieved.
On the basis of the above work, the present invention further provides a multi-split air conditioner, as shown in fig. 1, including an outdoor unit and a plurality of indoor units 100 and 200, where the indoor units 100 and 200 include indoor unit expansion valves 101 and 201, respectively, the outdoor unit includes a compressor 301 and an outdoor heat exchanger 303, and a subcooler 304 is further disposed between the outdoor heat exchanger 303 and the indoor unit expansion valves 101 and 201, and the subcooler 304 includes a subcooler expansion valve 305. The multi-split air conditioner adopts any one of the control methods to control the noise of the indoor unit.
When the multi-split air conditioner is started and operated in the refrigeration mode, the liquid flow noise of the indoor unit is well solved, and the overall noise level of the indoor unit is low.
Fig. 3 is a comparison graph showing the actually measured noise level before and after the noise reduction of the air conditioning system of fig. 1 is performed by using the preferred embodiment of the control method for reducing the noise of the air conditioning indoor unit of the present invention. In the figure, the upper curve is a noise curve before noise reduction, and the lower curve is a noise curve after noise reduction. It can be seen that, after the control method of the preferred embodiment of the present invention is adopted to reduce noise, when the air conditioner is started up and operated in the cooling mode, the noise level of the indoor unit is obviously reduced, the indoor unit has no obvious liquid flow noise, and the use is more comfortable.
Those skilled in the art will readily appreciate that the above-described preferred embodiments may be freely combined, superimposed, without conflict.
It will be understood that the embodiments described above are illustrative only and not restrictive, and that various obvious and equivalent modifications and substitutions for details described herein may be made by those skilled in the art without departing from the basic principles of the invention.
Claims (5)
1. A control method for reducing noise of an indoor unit of an air conditioner comprises an outdoor unit and the indoor unit, wherein the indoor unit comprises an indoor unit expansion valve, the outdoor unit comprises a compressor and an outdoor heat exchanger, a subcooler is arranged between the outdoor heat exchanger and the indoor unit expansion valve, and the subcooler comprises a subcooler expansion valve; the control method is characterized by comprising the following steps:
s10, controlling the air conditioner to start in a refrigeration mode;
s20, controlling the opening EXV1 of the expansion valve of the subcooler and the opening EXV2 of the expansion valve of the indoor unit to establish the supercooling degree of the system and ensure the superheat degree of the indoor unit;
in step S20, the step of controlling the opening degree of the internal expansion valve includes controlling the internal expansion valve during the compressor initialization period:
initializing the internal machine expansion valve as EXV2 ═ X, wherein the value range of X is 0-480, and,
when the temperature in T is more than or equal to 22 ℃, the value range of X is 100-200;
when the temperature in T is less than 22 ℃, the value range of X is 0-99;
wherein, the inside T is the indoor environment temperature;
in step S20, the step of controlling the opening degree of the internal expansion valve further includes controlling the internal expansion valve after the compressor is initialized:
the opening degree EXV2 of the indoor unit expansion valve is controlled according to the indoor unit superheat degree, and the formula is as follows: EXV2 is the original opening of the indoor unit expansion valve + the change of superheat degree c, wherein the change of superheat degree is the actual superheat degree-the target superheat degree, c is a constant, and the target superheat degree is the target value of the indoor unit superheat degree;
wherein when the change of the superheat degree is larger than 0, the value range of c is 10-15; when the change of the superheat degree is less than or equal to 0, the value range of c is 2-6;
in step S20, the step of controlling the opening degree of the expansion valve of the subcooler further includes performing initialization control on the subcooler:
controlling the opening degree of the expansion valve of the subcooler according to the frequency of the compressor, wherein the formula is as follows: EXV1 ═ a × P, where a is a constant and P is the frequency of the compressor;
wherein, when the initial control is carried out on the subcooler, the value range of the target value T1 of the supercooling degree of the system is 0-20, and,
when T1 is less than or equal to 5, the value range of a is 7-12;
when T1 is more than 5, the value range of a is 0-6;
in step S20, the step of controlling the opening degree of the expansion valve of the subcooler further includes control after initialization of the subcooler:
the opening degree EXV1 of the expansion valve of the subcooler is controlled according to the supercooling degree of the system according to the following formula: EXV1 is the original opening of the expansion valve of the subcooler + the change of the supercooling degree b, wherein the change of the supercooling degree is the actual supercooling degree-the target supercooling degree, b is a constant, and the target supercooling degree is the target value of the supercooling degree of the system;
when the supercooling degree change is larger than 0, the value range of b is 6-9;
when the change of the supercooling degree is less than or equal to 0, the value range of b is 1-4;
in step S20, before performing initialization control on the subcooler, the method further includes, during the compressor initialization period: the opening degree of the subcooler expansion valve is 0.
2. The control method according to claim 1, wherein, in step S20,
when the supercooling degree change is more than 0, b is 8;
when the supercooling degree change is less than or equal to 0, b is 2.
3. The control method according to claim 1, wherein in step S20, the target value of the indoor unit superheat degree is T2, and when T is equal to or more than 22 ℃, the value range of T2 is 1-2; when the temperature in T is less than 22 ℃, the value range of T2 is 3-5; wherein, the inside T is the indoor environment temperature.
4. The control method according to claim 1, wherein, in step S20,
when the change of the superheat degree is larger than 0, c is 12;
when the change of the superheat degree is less than or equal to 0, c is 4.
5. A multi-split air conditioner comprises an outdoor unit and an indoor unit, wherein the indoor unit comprises an indoor unit expansion valve, the outdoor unit comprises a compressor and an outdoor heat exchanger, a subcooler is arranged between the outdoor heat exchanger and the indoor unit expansion valve, and the subcooler comprises a subcooler expansion valve; the multi-split air conditioner is characterized in that the noise of the indoor unit is controlled by the control method of any one of claims 1 to 4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710170316.9A CN107062580B (en) | 2017-03-21 | 2017-03-21 | Control method for reducing noise of indoor unit of air conditioner and multi-split air conditioner |
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| CN201710170316.9A CN107062580B (en) | 2017-03-21 | 2017-03-21 | Control method for reducing noise of indoor unit of air conditioner and multi-split air conditioner |
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| CN107843037B (en) * | 2017-10-31 | 2021-02-23 | 广东美的暖通设备有限公司 | Multi-split air conditioning system and supercooling control device and method thereof |
| CN107990609B (en) * | 2017-11-20 | 2020-01-10 | 珠海格力电器股份有限公司 | Control method of electronic expansion valve and refrigerant circulating system |
| CN109185976A (en) * | 2018-09-04 | 2019-01-11 | 珠海格力电器股份有限公司 | Multi-joint unit, its degree of supercooling control method, computer equipment and storage medium |
| CN109899928A (en) * | 2019-03-20 | 2019-06-18 | 广东美的暖通设备有限公司 | The control method and device of the electric expansion valve of indoor machine evaporation entrance |
| CN112013522A (en) * | 2019-05-28 | 2020-12-01 | 日立江森自控空调有限公司 | Air conditioner abnormal sound processing method and air conditioner system |
| CN110410967B (en) * | 2019-07-03 | 2021-08-24 | 宁波奥克斯电气股份有限公司 | Control method for pipeline noise of multi-split air conditioning system and multi-split air conditioning system |
| CN110631285B (en) * | 2019-09-30 | 2021-02-23 | 广东美的暖通设备有限公司 | Multi-split system and control method thereof |
| CN110726225B (en) * | 2019-10-12 | 2021-01-05 | 广东美的暖通设备有限公司 | Multi-split system and control method thereof |
| CN110986224B (en) * | 2019-11-07 | 2021-05-14 | 珠海格力电器股份有限公司 | Air conditioner, control method thereof and storage medium |
| CN111928410B (en) * | 2020-06-30 | 2023-05-26 | 青岛海尔空调器有限总公司 | Control method for multi-split air conditioning unit |
| CN112902429B (en) * | 2020-12-28 | 2022-06-03 | 宁波奥克斯电气股份有限公司 | Noise reduction control method and device for air conditioner and air conditioner |
| CN112815512B (en) * | 2020-12-30 | 2022-08-23 | 宁波奥克斯电气股份有限公司 | Noise reduction method and device for multi-connected air conditioner indoor unit and multi-connected air conditioning system |
| CN113203166B (en) * | 2021-04-27 | 2022-06-28 | 宁波奥克斯电气股份有限公司 | Noise reduction control method and device for multi-connected air conditioner and multi-connected air conditioner |
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| CN113883699B (en) * | 2021-09-28 | 2023-07-18 | 青岛海尔空调器有限总公司 | Control method for reducing starting refrigerant sound of air conditioning system and air conditioning system |
| CN114413404B (en) * | 2021-12-20 | 2023-05-26 | 青岛海尔空调电子有限公司 | Method and device for reducing noise of air conditioner refrigerant, air conditioner and storage medium |
| WO2024040915A1 (en) * | 2022-08-22 | 2024-02-29 | 青岛海信日立空调系统有限公司 | Air conditioner |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3482845B2 (en) * | 1997-11-06 | 2004-01-06 | ダイキン工業株式会社 | Air conditioner |
| CN100555152C (en) * | 2007-03-26 | 2009-10-28 | 珠海格力电器股份有限公司 | The electronic Expansion Valve Control method |
| CN103033008B (en) * | 2011-09-29 | 2016-04-20 | 杭州三花研究院有限公司 | A kind of control method of automotive air-conditioning system electric expansion valve |
| CN104422209B (en) * | 2013-09-05 | 2016-08-10 | 珠海格力电器股份有限公司 | Air conditioning system |
| CN204404618U (en) * | 2014-12-19 | 2015-06-17 | 特灵空调系统(中国)有限公司 | External supercooling apparatus |
| CN104848579B (en) * | 2015-05-05 | 2017-12-01 | 广东美的制冷设备有限公司 | Air conditioner and its heat-exchange system |
| CN105674649A (en) * | 2016-01-06 | 2016-06-15 | 广东芬尼科技股份有限公司 | Control method for electronic expansion valve |
| CN106091271B (en) * | 2016-06-17 | 2019-07-19 | 广东美的制冷设备有限公司 | Air conditioner abnormal sound removing method and device |
| CN106403412A (en) * | 2016-10-25 | 2017-02-15 | 珠海格力电器股份有限公司 | Refrigerant circulatory system and refrigeration equipment |
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