CN112815512B - Noise reduction method and device for multi-connected air conditioner indoor unit and multi-connected air conditioning system - Google Patents

Noise reduction method and device for multi-connected air conditioner indoor unit and multi-connected air conditioning system Download PDF

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Publication number
CN112815512B
CN112815512B CN202011629388.3A CN202011629388A CN112815512B CN 112815512 B CN112815512 B CN 112815512B CN 202011629388 A CN202011629388 A CN 202011629388A CN 112815512 B CN112815512 B CN 112815512B
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starting
load
compressor
preset
noise reduction
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CN112815512A (en
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刘永超
刘合心
张稳
程相欣
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
Ningbo Aux Intelligent Commercial Air Conditioning Manufacturing Co Ltd
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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
    • 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
    • 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
    • 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
    • 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
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
    • F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • 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 provides a noise reduction method and device for an indoor unit of a multi-connected air conditioner and a multi-connected air conditioning system. The technical problem that the refrigerant flows through the electronic expansion valve of the inner machine to generate liquid flow sound is solved. The noise reduction method comprises the following steps: acquiring a compressor starting command; starting an outer fan at a rotating speed not higher than a middle gear in a first preset time before the compressor is started according to the starting load of an inner machine; and/or starting the internal machine electronic expansion valve at the second preset time after the compressor is started according to the internal machine starting load. The noise reduction method can improve the supercooling degree of the refrigerant, and further reduce or even avoid liquid flow sound.

Description

Noise reduction method and device for multi-connected air conditioner indoor unit and multi-connected air conditioner system
Technical Field
The invention relates to the technical field of air conditioners, in particular to a noise reduction method and device for a multi-connected air conditioner indoor unit and a multi-connected air conditioner system.
Background
With the continuous improvement of the living standard of people, the air conditioner becomes a necessary household appliance for thousands of households. People expect the air conditioning system not only to have good cooling and heating effects, but also to have a quiet environment. Therefore, the noise level of the air conditioner indoor unit becomes one of the important indexes for evaluating the comfort of the air conditioner.
For the indoor unit of the multi-split air conditioner, the electronic expansion valve is installed, so that the pressure drop effect is guaranteed, meanwhile, the accurate control of the refrigerant flow is realized, and the user comfort is improved. However, in the starting stage of the multi-split air conditioner in the cooling mode, because the system parameters are not stable (the refrigerant is in a gas-liquid mixed state), when the refrigerant in the gas-liquid mixed state passes through the electronic expansion valve, a great liquid flow sound is generated, and particularly under the condition of high-temperature cooling (or long connecting pipe, or insufficient system refrigerant), the supercooling degree of the refrigerant is insufficient, and the liquid flow sound is more obvious, so that the user experience is influenced.
Disclosure of Invention
The invention solves the problem that the refrigerant generates great liquid flow sound when passing through an internal electronic expansion valve due to insufficient supercooling degree of the refrigerant in the starting stage of the compressor.
In order to solve the above problems, a first object of the present invention is to provide a noise reduction method for a multi-connected air conditioner indoor unit, comprising the steps of:
acquiring a compressor starting command;
starting an outer fan at a rotating speed not higher than a middle gear in a first preset time before the compressor is started according to the starting load of an inner machine; and/or starting the internal machine electronic expansion valve at the second preset time after the compressor is started according to the internal machine starting load.
In the multi-connected air-conditioning system, the external fan is started in the first preset time before the compressor is started, and the starting speed of the external fan is not higher than the middle-gear rotating speed, so that the starting speed is lower than that of the existing external fan, namely the rotating speed of the external fan is reduced in the starting stage of the external fan, so that the heat exchange quantity of the external fan is reduced, the high-pressure is ensured, the heat exchange temperature difference is increased, the supercooling degree of a refrigerant is increased, the liquid flow sound is reduced or even avoided, and the noise is reduced or even avoided; because the internal electronic expansion valve is started at the second preset time after the compressor is started, namely the internal electronic expansion valve is started in a delayed mode relative to the compressor, the refrigerant can be accumulated in front of the internal electronic expansion valve in a short time, and after the refrigerant is accumulated, the corresponding supercooling degree can be increased, so that the pure liquid refrigerant entering the internal electronic expansion valve is ensured, the liquid flow sound is reduced or even avoided, and the noise is reduced or even avoided.
Further, in the step of starting the outer fan at the rotating speed not higher than the middle gear in the first preset time before the compressor is started according to the starting load of the inner unit,
when the starting load of the internal fan is smaller than the minimum preset load, selecting the rotating speed of the external fan at the starting stage as a low gear;
when the starting load of the internal fan is more than or equal to the minimum preset load and less than or equal to the maximum load, selecting the rotating speed of the external fan in the starting stage as a middle gear;
and when the starting load of the internal fan is greater than or equal to the maximum preset load, selecting the rotating speed of the external fan in the starting stage as a middle gear.
In the starting stage of the outer fan, the rotating speed of the outer fan is reduced, so that the heat exchange quantity of the outer fan is reduced, the high-pressure is ensured, the heat exchange temperature difference is increased, the supercooling degree of the refrigerant is increased, and the liquid flow sound is reduced or even avoided.
Further, the value range of the first predetermined time is as follows: 3-10 s; the external fan is started within a time period of 3-10 s before the compressor is started, and the starting time is better.
And/or the minimum preset load value range is as follows: 0-40%, the value range of the maximum preset load is as follows: 50 to 70 percent. The minimum preset load value range and the maximum preset load value range of the internal machine can ensure that the starting load of the internal machine is in a more reasonable range.
Furthermore, in the step of starting the electronic expansion valve of the internal machine in the second preset time after the compressor is started according to the starting load of the internal machine,
when the starting load of the internal machine is smaller than the minimum preset load, the value range of the second preset time is as follows: 30-50 s;
when the starting load of the internal machine is greater than or equal to the minimum preset load and less than or equal to the maximum load, the value range of the second preset time is as follows: 20-40 s;
when the starting load of the internal machine is greater than or equal to the maximum preset load, the value range of the second preset time is as follows: 10-30 s.
The smaller the starting load of the internal machine is, the longer the delayed second preset time is; the larger the starting load of the inner machine is, the shorter the delayed second preset time is, so that the optimal accumulation effect of the refrigerant in front of the inner machine electronic expansion valve is realized, and the supercooling degree of the refrigerant is further ensured.
Further, in the step of obtaining the compressor start command,
the starting frequency of the compressor is not more than the preset first-stage fixed frequency. The first stage fixed frequency is aimed at preventing the high pressure from being too high during the start-up stage of the compressor.
Further, the starting frequency of the compressor is not less than the lowest preset frequency, and the value range of the lowest preset frequency is as follows: 15-20 Hz. The lowest preset frequency ensures reliable oil return of the multi-connected air conditioning system.
Further, the starting frequency calculation formula of the compressor is as follows: fn 0 ＝k 1 *Fn 1 Wherein, the starting frequency coefficient k of the press is obtained according to the minimum preset load of the starting load of the internal machine and the length of the connecting pipe between the internal machine and the external machine 1 And k is an 1 ＜1；Fn 1 The frequency is fixed for a preset first stage.
According to the starting frequency calculation formula, the starting frequency of the compressor is smaller than the first-stage fixed frequency, the high pressure of the compressor in the starting stage can be prevented from being too high, and the supercooling degree of the refrigerant is further ensured.
Further, the calculation formula of the starting frequency coefficient of the press is as follows: k is a radical of 1 ＝f 1 *L 1 (ii) a Wherein f is 1 For the minimum preset load of the starting load of the internal machine, the value range is as follows: 0-40%; l is 1 For the length coefficient of the connecting pipe between the inner machine and the outer machine, the value range is as follows: 0.5 to 3. So set up, can make the internal unit start load and the setting of connecting pipe length coefficient phase-match, guarantee simultaneously that the press starts the frequency coefficient and is less than 1.
The second purpose of the invention provides a noise reduction device for an indoor unit of a multi-connected air conditioner, which comprises:
the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring a compressor starting command;
the control unit is used for starting the outer fan at a rotating speed not higher than the middle gear in first preset time before the compressor is started according to the starting load of the inner fan; the control unit is also used for starting the internal machine electronic expansion valve at a second preset time after the compressor is started according to the internal machine starting load.
In the noise reduction device of the multi-connected air conditioner indoor unit, the acquisition unit acquires a starting command of the compressor, the control unit controls the opening of the outer fan and the electronic expansion valve of the indoor unit, the outer fan is started in the first preset time before the compressor is started in the actual control process, the starting speed of the outer fan is not higher than the middle-gear rotating speed, the starting speed is lower than that of the existing outer fan, namely the rotating speed of the outer fan is reduced in the starting stage of the outer fan, so that the heat exchange quantity of the outer fan is reduced, the high-pressure is ensured, the heat exchange temperature difference is increased, the supercooling degree of a refrigerant is increased, liquid flow sound is reduced or even avoided, and noise is reduced or even avoided; because the internal electronic expansion valve is started at the second preset time after the compressor is started, namely the internal electronic expansion valve is started in a delayed mode relative to the compressor, the refrigerant can be accumulated in front of the internal electronic expansion valve in a short time, and after the refrigerant is accumulated, the corresponding supercooling degree can be increased, so that the pure liquid refrigerant entering the internal electronic expansion valve is ensured, the liquid flow sound is reduced or even avoided, and the noise is reduced or even avoided.
A third objective of the present invention is to provide a multi-connected air conditioning system, which includes a computer readable storage medium storing a computer program and a processor, where the computer program is read by the processor and executed to implement the above noise reduction method, and specific effects are described in the above description of the noise reduction method and will not be described herein again.
A fourth object of the present invention is to provide a computer-readable storage medium, where a computer program is stored, and when the computer program is read and executed by a processor, the noise reduction method is implemented, and specific effects are described in the above description of the noise reduction method, and are not described herein again.
Drawings
FIG. 1 is a schematic diagram of a start sequence of a multi-connected air conditioner in the prior art;
fig. 2 is a schematic diagram of a start timing sequence of a multi-connected air conditioner according to an embodiment of the invention;
fig. 3 is a schematic step diagram of a noise reduction method for a multi-connected air conditioner indoor unit according to a first embodiment of the present invention;
fig. 4 is a schematic step diagram of a noise reduction method for a multi-connected air conditioner indoor unit according to a second embodiment of the present invention;
fig. 5 is a schematic step diagram of a noise reduction method for a multi-connected air conditioner indoor unit according to a third embodiment of the present invention.
Description of reference numerals:
schematic diagram of the starting frequency curve, Fn, of an X-compressor 0 、Fn 1 、Fn 2 Respectively the frequency of the corresponding stage of the corresponding curve;
y-the rotating speed curve diagram of the starting stage of the outer fan;
z-inner machine electronic expansion valve starting curve diagram, P 1 The opening degree of the electronic expansion valve;
t 1 -an early start-up time for the outer blower compared to the compressor, i.e. a first predetermined time;
t 2 -the time taken for the starting process of the compressor, electronic expansion valve in the prior art;
t 3 -delaying the start-up time of the electronic expansion valve of the invention compared to the compressor, i.e. a second predetermined time;
A. b, C show three different start time positions.
Detailed Description
Generally, a multi-connected air conditioning system comprises an external unit and a plurality of internal units, and the middle of the multi-connected air conditioning system is composed of a connecting pipe and a branch pipe. In general, about 80% of the probability is that the machine is turned on only by 1 machine (small load operation) during the use process of a user.
High pressure saturation temperature: the multi-connected air conditioning system generally detects the high pressure of the system by a high pressure sensor, and the saturation temperature corresponding to the high pressure is the high pressure saturation temperature.
In the refrigeration mode, the supercooling degree of the refrigerant is equal to the high-pressure saturation temperature and the defrosting temperature of the outer unit, the larger the supercooling degree is, the better the condensation effect is, and the refrigerant entering the inner unit is more in a pure liquid state.
Note: the defrosting temperature is the detection temperature of the defrosting bulb of the outer machine and is positioned at the outlet of the condenser, and is equivalent to the temperature of the liquid refrigerant flowing out of the condenser in the refrigeration mode.
In the existing multi-connected air conditioning system, as shown in fig. 1, after the indoor unit receives a cooling start command, the compressor is turned on, and the turn-on and operating frequency of the compressor are generally gradually increased in a stepwise manner from low to high according to a fixed frequency, for example, Fn 1 For the first stage to fix the frequency, Fn 2 Fixing the frequency for the second stage, and so on; meanwhile, the electronic expansion valve of the internal machine is opened, so that the high pressure in the starting process can be prevented from being too high, but the supercooling degree of the internal machine cannot be effectively established. The outer fan receives the compressor machine initial stage of beginning work after the start order, satisfies the maximum rotational speed operation that the noise requirement allowed usually, leads to high pressure to reduce like this easily, is unfavorable for condenser condensation heat transfer.
Therefore, in the process of starting the compressor, the supercooling degree of the inner machine is low, the refrigerant is in a vapor-liquid two-phase state, when the refrigerant passes through the electronic expansion valve, swamping liquid flow sound is easily generated, the liquid flow sound of the refrigerant of the inner machine is obvious, and particularly the situation that the starting capacity of the long connecting pipe and the inner machine is small (1 inner machine is opened) is obvious.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Example one
The embodiment provides a noise reduction method for an indoor unit of a multi-connected air conditioner, as shown in fig. 3, the noise reduction method comprises the following steps:
s302, acquiring a compressor starting command;
s304, starting the outer fan at a rotating speed not higher than the middle gear in first preset time before the compressor is started according to the starting load of the inner fan; that is, the outer fan is started in advance of the compressor start by a first predetermined time. Specifically, the value range of the first preset time is as follows: 3-10 s; preferably, the first predetermined time is 5 s;
s306, according to the starting load of the internal machine, the electronic expansion valve of the internal machine is started in the second preset time after the compressor is started, and the electronic expansion valve of the internal machine is started in a delayed mode in the second preset time relative to the starting of the compressor.
In the multi-connected air conditioning system provided by the embodiment, as shown in fig. 2, the first predetermined time t before the compressor is started 1 The starting speed of the external fan is not higher than the middle-gear rotating speed, so that the starting speed is lower than that of the existing external fan, namely the rotating speed of the external fan is reduced in the starting stage of the external fan, the heat exchange quantity of the external fan is reduced, the high-pressure is ensured, the heat exchange temperature difference is increased, the supercooling degree of a refrigerant is increased, liquid flow sound is reduced or even avoided, and noise is reduced or even avoided; as shown in fig. 2, the electronic expansion valve of the internal machine is at the second preset time t after the compressor is started 3 The method is characterized in that the refrigerant is accumulated in front of the inner electronic expansion valve in a short time, and the corresponding supercooling degree is increased after the refrigerant is accumulated, so that pure liquid refrigerant entering the inner electronic expansion valve is ensured, liquid flow sound is reduced or even avoided, and noise is reduced or even avoided.
In the actual control process, the starting frequency of the compressor, the rotating speed of the external fan at the starting stage and the opening of the electronic expansion valve of the internal unit can be coupled and controlled, so that the supercooling degree of the refrigerant of the internal unit in the refrigeration starting process is rapidly improved, and the liquid flow sound of the refrigerant in the refrigeration starting process is reduced.
In this embodiment, specifically, the step S304 includes the following steps.
When the starting load of the internal fan is smaller than the minimum preset load, selecting the rotating speed of the external fan at the starting stage as a low gear;
when the starting load of the internal fan is greater than or equal to the minimum preset load and less than or equal to the maximum load, selecting the rotating speed of the external fan at the starting stage as a middle gear;
and when the starting load of the internal fan is greater than or equal to the maximum preset load, selecting the rotating speed of the external fan in the starting stage as a middle gear.
Wherein, the minimum preset load value range is: 0-40%, preferably 30%; the value range of the maximum preset load is as follows: 50 to 70%, preferably 60%. The starting load of the internal machines mainly depends on the starting quantity of the internal machines and the sum of the rated cold quantity of each internal machine.
In the starting stage of the outer fan, the rotating speed of the outer fan is reduced, so that the heat exchange quantity of the outer fan is reduced, the high-pressure is ensured, the heat exchange temperature difference is increased, the supercooling degree of the refrigerant is increased, and the liquid flow sound is reduced or even avoided.
In this embodiment, specifically, in the step S306, the matching relationship between the internal machine startup load and the second predetermined time is as follows.
When the starting load of the internal machine is smaller than the minimum preset load, the value range of the second preset time is as follows: 30-50 s, preferably 40 s; when the starting load of the internal machine is greater than or equal to the minimum preset load and less than or equal to the maximum load, the value range of the second preset time is as follows: 20-40 s, preferably 30 s; when the starting load of the internal machine is greater than or equal to the maximum preset load, the value range of the second preset time is as follows: 10-30 s, preferably 15 s. The smaller the starting load of the internal machine is, the longer the delayed second preset time is; the larger the starting load of the inner machine is, the shorter the delayed second preset time is, so that the optimal accumulation effect of the refrigerant in front of the inner machine electronic expansion valve is realized, the supercooling degree of the refrigerant is further ensured, and the generation of refrigerant liquid flow sound is reduced or even avoided.
In this embodiment, specifically, in the step S302, the starting frequency of the compressor is not greater than the preset first-stage fixed frequency and not less than the lowest preset frequency. Specifically, the minimum preset frequency value range is as follows: 15-20 Hz, preferably 20 Hz. During the starting process of the compressor, the starting frequency of the compressor is gradually increased in a segmented mode, wherein the fixed frequency of the first stage is the starting or working frequency of the first segment.
Specifically, the starting frequency calculation formula of the compressor is as follows: fn 0 ＝k 1 *Fn 1 Wherein, the starting frequency coefficient k of the press is obtained according to the minimum preset load of the starting load of the internal machine and the length of the connecting pipe between the internal machine and the external machine 1 And k is 1 ＜1；Fn 1 The frequency is fixed for a preset first stage. The starting frequency coefficient calculation formula of the press is as follows: k is a radical of formula 1 ＝f 1 *L 1 ；f 1 For the minimum preset load of the starting load of the internal machine, the value range is as follows: 0-40%, preferably 30%; l is 1 For the connecting pipe length coefficient between the interior outer machine, it is relevant with the length of connecting pipe, and the connecting pipe is longer, and this connecting pipe length coefficient is big more, and this connecting pipe length coefficient's value range is: 0.5 to 3. So set up, can make the internal unit start load and the setting of connecting pipe length coefficient phase-match, guarantee simultaneously that the press starts the frequency coefficient and is less than 1.
According to the starting load f of the internal machine 1 (for example, the internal machine is started only), the starting frequency of the compressor is reduced, the high pressure in the starting stage is prevented from being too high, and meanwhile, the oil return reliability is ensured.
In conclusion, according to the internal machine load and the length of the internal and external machine connecting pipe, the starting high frequency of the compressor, the rotating speed of the external fan and the opening of the electronic expansion valve are finely controlled, and further the occurrence of refrigerant fluid flow sound is reduced or even avoided.
Example two
The embodiment provides a noise reduction method for an indoor unit of a multi-connected air conditioner, as shown in fig. 4, the noise reduction method comprises the following steps:
s402, acquiring a compressor starting command;
s404, starting the outer fan at a rotating speed not higher than the middle gear in a first preset time before the compressor is started according to the starting load of the inner fan; that is, the outer fan is started in advance of the compressor start by a first predetermined time. Specifically, the value range of the first predetermined time is as follows: 3-10 s; preferably, the first predetermined time is 5 s.
In the multi-connected air conditioning system, the outer fan is started in the first preset time before the compressor is started, and the starting speed of the outer fan is not higher than the middle-gear rotating speed, so that the starting speed is lower than that of the existing outer fan, namely the rotating speed of the outer fan is reduced in the starting stage of the outer fan, so that the heat exchange quantity of the outer fan is reduced, the high-pressure is ensured, the heat exchange temperature difference is increased, the supercooling degree of a refrigerant is increased, liquid flow sound is reduced or even avoided, and noise is reduced or even avoided.
In the actual control process, the starting frequency of the compressor and the rotating speed of the external fan in the starting stage can be coupled and controlled, so that the supercooling degree of the refrigerant of the internal fan in the refrigerating starting process is rapidly improved, and the refrigerant fluid flow noise in the refrigerating starting process is reduced.
In this embodiment, specifically, the step S404 includes the following steps.
When the starting load of the internal fan is smaller than the minimum preset load, selecting the rotating speed of the external fan at the starting stage as a low gear;
when the starting load of the internal fan is greater than or equal to the minimum preset load and less than or equal to the maximum load, selecting the rotating speed of the external fan at the starting stage as a middle gear;
and when the starting load of the internal fan is greater than or equal to the maximum preset load, selecting the rotating speed of the external fan at the starting stage as a middle gear.
Wherein, the minimum preset load value range is: 0-40%, preferably 30%; the value range of the maximum preset load is as follows: 50 to 70%, preferably 60%.
In the starting stage of the outer fan, the rotating speed of the outer fan is reduced, so that the heat exchange quantity of the outer fan is reduced, the high pressure is ensured, the heat exchange temperature difference is increased, the supercooling degree of a refrigerant is increased, and liquid flow sound is reduced or even avoided.
In this embodiment, specifically, in the step 402, the starting frequency of the compressor is not greater than the preset first-stage fixed frequency and not less than the lowest preset frequency. Specifically, the minimum preset frequency value range is as follows: 15-20 Hz, preferably 20 Hz. During the starting process of the compressor, the starting frequency of the compressor is gradually increased in a segmented mode, wherein the fixed frequency of the first stage is the starting or working frequency of the first segment.
Specifically, the starting frequency calculation formula of the compressor is as follows: fn 0 ＝k 1 *Fn 1 Wherein, the starting frequency coefficient k of the press is obtained according to the minimum preset load of the starting load of the internal machine and the length of the connecting pipe between the internal machine and the external machine 1 And k is 1 ＜1；Fn 1 The frequency is fixed for a preset first phase. The starting frequency coefficient calculation formula of the press is as follows: k is a radical of 1 ＝f 1 *L 1 ；f 1 For the minimum preset load of the starting load of the internal machine, the value range is as follows: 0-40%, preferably 30%; l is 1 For the length coefficient of the connecting pipe between the inner machine and the outer machine, the value range is as follows: 0.5 to 3. So set up, can make the internal unit start load and the setting of connecting pipe length coefficient phase-match, guarantee simultaneously that the press starts the frequency coefficient and is less than 1.
According to the starting load f of the internal machine 1 (for example, the internal machine is started only), the starting frequency of the compressor is reduced, the high pressure in the starting stage is prevented from being too high, and meanwhile, the oil return reliability is ensured.
In conclusion, according to the load of the inner machine and the length of the connecting pipe of the inner machine and the outer machine, the high starting frequency of the compressor and the rotating speed of the outer fan are finely controlled, and the occurrence of refrigerant fluid flow noise is reduced or even avoided.
EXAMPLE III
The embodiment provides a noise reduction method for an indoor unit of a multi-connected air conditioner, as shown in fig. 5, the noise reduction method comprises the following steps:
s502, acquiring a compressor starting command;
s506, according to the starting load of the internal machine, the electronic expansion valve of the internal machine is started in the second preset time after the compressor is started, and the electronic expansion valve of the internal machine is started in a delayed mode in the second preset time relative to the starting of the compressor.
In the multi-connected air conditioning system, the internal electronic expansion valve is started at the second preset time after the compressor is started, namely, the internal electronic expansion valve is started in a delayed mode relative to the compressor, so that the refrigerant can be accumulated in front of the internal electronic expansion valve in a short time, and after the refrigerant is accumulated, the corresponding supercooling degree can be increased, so that the pure liquid refrigerant entering the internal electronic expansion valve is ensured, the liquid flow sound is reduced or even avoided, and the noise is reduced or even avoided.
In the actual control process, the starting frequency of the compressor and the opening of the electronic expansion valve of the indoor unit can be coupled and controlled, so that the supercooling degree of the refrigerant of the indoor unit in the refrigeration starting process is rapidly improved, and the refrigerant flow noise in the refrigeration starting process is reduced.
In this embodiment, specifically, in the step S506, the matching relationship between the internal unit startup load and the second predetermined time is as follows.
When the starting load of the internal machine is smaller than the minimum preset load, the value range of the second preset time is as follows: 30-50 s, preferably 40 s; when the starting load of the internal machine is greater than or equal to the minimum preset load and less than or equal to the maximum load, the value range of the second preset time is as follows: 20-40 s, preferably 30 s; when the starting load of the internal machine is greater than or equal to the maximum preset load, the value range of the second preset time is as follows: 10-30 s, preferably 15 s. Wherein, the minimum preset load value range is: 0-40%, and the maximum preset load value range is as follows: 50 to 70 percent. The smaller the starting load of the internal machine is, the longer the delayed second preset time is; the larger the starting load of the inner machine is, the shorter the delayed second preset time is, so that the optimal accumulation effect of the refrigerant in front of the inner machine electronic expansion valve is realized, the supercooling degree of the refrigerant is further ensured, and the generation of refrigerant liquid flow sound is reduced or even avoided.
Wherein, the minimum preset load value range is: 0-40%, preferably 30%; the value range of the maximum preset load is as follows: 50 to 70%, preferably 60%.
In this embodiment, specifically, in the step S506, the starting frequency of the compressor is not greater than the preset first-stage fixed frequency and not less than the lowest preset frequency. Specifically, the minimum preset frequency value range is as follows: 15-20 Hz, preferably 20 Hz. During the starting process of the compressor, the starting frequency of the compressor is gradually increased in a segmented mode, wherein the fixed frequency of the first stage is the starting or working frequency of the first stage.
Specifically, the starting frequency calculation formula of the compressor is as follows: fn 0 ＝k 1 *Fn 1 Wherein, the starting frequency coefficient k of the press is obtained according to the minimum preset load of the starting load of the inner machine and the length of the connecting pipe between the inner machine and the outer machine 1 And k is 1 ＜1；Fn 1 The frequency is fixed for a preset first phase. The starting frequency coefficient calculation formula of the press is as follows: k is a radical of 1 ＝f 1 *L 1 ；f 1 For the minimum preset load of the starting load of the internal machine, the value range is as follows: 0-40%, preferably 30%; l is 1 For the length coefficient of the connecting pipe between the inner machine and the outer machine, the value range is as follows: 0.5 &3. So set up, can make the internal unit start load and the setting of connecting pipe length coefficient phase-match, guarantee simultaneously that the press start frequency coefficient is less than 1.
According to the starting load f of the internal machine 1 (for example, the internal machine is started only), the starting frequency of the compressor is reduced, the high pressure in the starting stage is prevented from being too high, and meanwhile, the oil return reliability is ensured.
In conclusion, the starting frequency of the compressor, the rotating speed of the starting stage of the outer fan and the opening time of the electronic expansion valve are finely controlled according to the load of the inner fan and the length of the connecting pipe of the inner fan and the outer fan, so that the occurrence of refrigerant fluid flow sound is reduced and even avoided.
It should be noted that the noise reduction methods provided by the present application include, but are not limited to, the noise reduction methods listed in the above three embodiments, and the following methods are combined to achieve the enhancement of the degree of supercooling of the refrigerant:
1) the starting frequency of the compressor is independently controlled, namely, the starting frequency of the compressor is reduced in the starting process of the compressor so as to improve the supercooling degree of the refrigerant, thereby reducing or even avoiding the occurrence of liquid flow sound of the refrigerant.
2) The opening time of the electronic expansion valve of the inner machine is independently controlled, namely, the electronic expansion valve of the inner machine is opened in a delayed mode, so that the supercooling degree of the refrigerant is improved, and the liquid flow sound of the refrigerant is reduced or even avoided.
3) The rotating speed of the starting stage of the outer fan is controlled independently, namely the rotating speed of the starting stage of the outer fan is reduced, high-pressure is guaranteed, the condensation heat exchange effect of the condenser is improved, the supercooling degree of the refrigerant is further improved, and the liquid flow sound of the refrigerant is reduced or even avoided.
4) The starting frequency of the compressor and the starting time of the electronic expansion valve of the indoor unit are controlled in a coupling mode, namely, the starting frequency of the compressor is reduced, and the electronic expansion valve of the indoor unit is started in a delayed mode to improve the supercooling degree of the refrigerant, so that the occurrence of liquid flow sound of the refrigerant is reduced and even avoided.
5) The starting frequency of the compressor and the rotating speed of the external fan at the starting stage are controlled in a coupling mode, namely, the starting frequency of the compressor is reduced, and the rotating speed of the external fan at the starting stage is reduced, so that the high-pressure is ensured, the condensation heat exchange effect of a condenser is improved, the supercooling degree of a refrigerant is improved, and the liquid flow sound of the refrigerant is reduced or even avoided;
6) the opening time of the electronic expansion valve of the inner machine and the rotating speed of the starting stage of the outer fan are controlled in a coupling mode, namely, the opening time of the electronic expansion valve of the inner machine is delayed, and the rotating speed of the starting stage of the outer fan is reduced, so that the high pressure is ensured, the supercooling degree of the refrigerant is improved, and the liquid flow sound of the refrigerant is reduced or even avoided.
7) The starting frequency of the compressed gas, the opening time of the electronic expansion valve of the inner fan and the rotating speed of the outer fan in the starting stage are controlled in a coupling mode, namely, the starting frequency of the compressor is reduced, the opening time of the electronic expansion valve of the inner fan is delayed, the rotating speed of the outer fan in the starting stage is reduced, high pressure is guaranteed, the supercooling degree of a refrigerant is improved, and then refrigerant liquid flow sound is reduced or even avoided.
Example four
The embodiment provides a device of making an uproar falls in air conditioner that ally oneself with more, includes:
the acquisition unit is used for acquiring a compressor starting command;
the control unit is used for starting the outer fan at a rotating speed which is not higher than a middle gear in a first preset time before the compressor is started according to the starting load of the inner fan; the control unit is also used for starting the internal machine electronic expansion valve at the second preset time after the compressor is started according to the internal machine starting load.
In the noise reduction device of the multi-connected air conditioner indoor unit, the acquisition unit acquires a starting command of the compressor, the control unit controls the opening of the outer fan and the electronic expansion valve of the indoor unit, the outer fan is started in the first preset time before the compressor is started in the actual control process, the starting speed of the outer fan is not higher than the middle-gear rotating speed, the starting speed is lower than that of the existing outer fan, namely the rotating speed of the outer fan is reduced in the starting stage of the outer fan, so that the heat exchange quantity of the outer fan is reduced, the high-pressure is ensured, the heat exchange temperature difference is increased, the supercooling degree of a refrigerant is increased, liquid flow sound is reduced or even avoided, and noise is reduced or even avoided; because the internal electronic expansion valve is started at the second preset time after the compressor is started, namely the internal electronic expansion valve is started in a delayed mode relative to the compressor, the refrigerant can be accumulated in front of the internal electronic expansion valve in a short time, and after the refrigerant is accumulated, the corresponding supercooling degree can be increased, so that the pure liquid refrigerant entering the internal electronic expansion valve is ensured, the liquid flow sound is reduced or even avoided, and the noise is reduced or even avoided.
EXAMPLE five
The embodiment provides a multi-connected air conditioning system, which includes a computer readable storage medium storing a computer program and a processor, wherein the computer program is read by the processor and executed to implement the noise reduction method, and specific effects are described in the above description of the noise reduction method and are not described herein again.
EXAMPLE six
The present embodiment provides a computer-readable storage medium, where a computer program is stored, and when the computer program is read and executed by a processor, the noise reduction method is implemented, and specific effects are described in the above description of the noise reduction method, and are not described herein again.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A noise reduction method for an indoor unit of a multi-connected air conditioner is characterized by comprising the following steps:
acquiring a compressor starting command;
according to the starting load of the internal machine, starting the external fan at a rotating speed not higher than the middle gear in a first preset time before the compressor is started, wherein the step comprises the following steps: when the starting load of the internal fan is smaller than the minimum preset load, selecting the rotating speed of the external fan at the starting stage as a low gear; when the starting load of the internal fan is greater than or equal to the minimum preset load and less than or equal to the maximum load, selecting the rotating speed of the external fan at the starting stage as a middle gear; when the starting load of the internal fan is greater than or equal to the maximum preset load, selecting the rotating speed of the external fan in the starting stage as a middle gear;
starting an internal machine electronic expansion valve at a second preset time after the compressor is started according to the internal machine starting load, wherein the smaller the internal machine starting load is, the longer the delayed second preset time is; the larger the internal machine starting load is, the shorter the delayed second preset time is.
2. The noise reduction method for the multi-connected air conditioner indoor unit according to claim 1, wherein the value range of the first preset time is as follows: 3-10 s;
and/or the minimum preset load value range is as follows: 0-40%, the value range of the maximum preset load is as follows: 50 to 70 percent.
3. The noise reduction method according to claim 1 or 2, wherein in the step of starting the indoor unit electronic expansion valve for a second predetermined time after the start of the compressor according to the indoor unit starting load,
when the starting load of the internal machine is smaller than the minimum preset load, the value range of the second preset time is as follows: 30-50 s;
when the starting load of the internal machine is greater than or equal to the minimum preset load and less than or equal to the maximum load, the value range of the second preset time is as follows: 20-40 s;
when the starting load of the internal machine is greater than or equal to the maximum preset load, the value range of the second preset time is as follows: 10 to 30 seconds.
4. The multi-connected air conditioner indoor unit noise reduction method according to claim 3, wherein in the step of obtaining the compressor start command,
the starting frequency of the compressor is not more than the preset first-stage fixed frequency.
5. The noise reduction method for the multi-connected air conditioner indoor unit as claimed in claim 4, wherein the starting frequency of the compressor is not less than a lowest preset frequency, and the lowest preset frequency has a value range of: 15-20 Hz.
6. The noise reduction method for the multi-connected air conditioner indoor unit according to claim 5, wherein the starting frequency calculation formula of the compressor is as follows: fn0= k1 × Fn1, wherein a starting frequency coefficient k1 of the press is obtained according to a minimum preset load of the internal machine starting load and a length of a connecting pipe between the internal machine and the external machine, and k1 is less than 1; fn1 is a preset first stage fixed frequency.
7. The noise reduction method for the multi-connected air conditioner indoor unit according to claim 6, wherein the starting frequency coefficient calculation formula of the press is as follows: k1= f1 × L1; wherein f1 is the minimum preset load of the internal machine startup load, and the value range is: 0-40%; l1 is the connecting pipe length coefficient between the interior machine, and the value range is: 0.5 to 3.
8. A noise reduction device for a multi-connected air conditioner indoor unit, which is applied to the noise reduction method for the multi-connected air conditioner indoor unit according to any one of claims 1 to 7, and comprises:
the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring a compressor starting command;
the control unit is used for starting the outer fan at a rotating speed not higher than the middle gear in first preset time before the compressor is started according to the starting load of the inner fan; the control unit is also used for starting the internal machine electronic expansion valve at a second preset time after the compressor is started according to the internal machine starting load.
9. A multi-connected air conditioning system comprising a computer-readable storage medium storing a computer program and a processor, the computer program being read and executed by the processor to implement the noise reduction method according to any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when read and executed by a processor, implements the noise reduction method according to any one of claims 1 to 7.
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