CN117553413A - Noise control method and device for multi-split air conditioner system and multi-split air conditioner system - Google Patents

Noise control method and device for multi-split air conditioner system and multi-split air conditioner system Download PDF

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Publication number
CN117553413A
CN117553413A CN202311508333.0A CN202311508333A CN117553413A CN 117553413 A CN117553413 A CN 117553413A CN 202311508333 A CN202311508333 A CN 202311508333A CN 117553413 A CN117553413 A CN 117553413A
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China
Prior art keywords
internal
internal machine
expansion valve
electronic expansion
threshold value
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CN202311508333.0A
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Inventor
陈华
刘合心
解凯
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Priority to CN202311508333.0A priority Critical patent/CN117553413A/en
Publication of CN117553413A publication Critical patent/CN117553413A/en
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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
    • 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
    • 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
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/10—Pressure
    • F24F2140/12—Heat-exchange fluid pressure
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)

Abstract

The invention provides a noise control method and device for a multi-split system and the multi-split system, wherein the method comprises the following steps: obtaining the corresponding saturated temperature and condensing temperature of the exhaust pressure of each internal machine, and calculating the difference value of the saturated temperature and condensing temperature of each internal machine; the condensing temperature is the temperature collected by a liquid tube temperature sensing bulb at the inlet of the electronic expansion valve; if the difference value of all the internal machines is larger than the first threshold value, maintaining the current opening of the electronic expansion valve of each internal machine; if the difference value of the partial internal machines is smaller than the first threshold value, reducing the opening of the electronic expansion valve of the partial internal machines to enable the difference value to be larger than the first threshold value; if the opening degree of the electronic expansion valve of the part of the internal machines is regulated to the minimum opening degree, increasing the opening degree of the electronic expansion valve of the part of the internal machines so that the difference value is smaller than a second threshold value; the second threshold is less than the first threshold. According to the embodiment of the invention, the refrigerant state of the heating standby is controlled through differentiation, so that the noise of the internal machine during shutdown is reduced.

Description

Noise control method and device for multi-split air conditioner system and multi-split air conditioner system
Technical Field
The invention relates to the technical field of air conditioner noise reduction, in particular to a multi-split system noise control method and device and a multi-split system.
Background
When the multi-split air conditioner system is in heating operation, the electronic expansion valve of the inner machine in a shutdown/standby state needs to keep a certain small opening to circulate the refrigerant, so that the defect of fluorine deficiency in system operation caused by liquid accumulation of the shutdown inner machine is avoided. However, the flow of the refrigerant can bring flow noise to influence the use experience of users.
Disclosure of Invention
In order to solve the above problems, an embodiment of the present invention provides a method for controlling noise of a multi-split system, where the multi-split system includes a plurality of internal units, the method includes: obtaining the corresponding saturated temperature and condensing temperature of the exhaust pressure of each internal machine, and calculating the difference value between the saturated temperature and condensing temperature of each internal machine; the condensing temperature is the acquisition temperature of a liquid pipe temperature sensing bulb at the inlet of the electronic expansion valve; if the difference values of all the internal machines are larger than a first threshold value, maintaining the current opening of the electronic expansion valve of each internal machine; if the difference value of part of the internal machines is smaller than the first threshold value, reducing the opening degree of the electronic expansion valve of part of the internal machines so that the difference value is larger than the first threshold value; if the opening degree of the electronic expansion valve of part of the internal machines is regulated to the minimum opening degree, increasing the opening degree of the electronic expansion valve of part of the internal machines so that the difference value is smaller than a second threshold value; the second threshold is less than the first threshold.
According to the noise control method for the multi-split air conditioner system, the gas-liquid state of the refrigerant flowing through the electronic expansion valve is determined according to the difference value of the saturated temperature and the condensing temperature corresponding to the exhaust pressure, the opening degree of the electronic expansion valve is controlled to be reduced, so that the refrigerant is in a full liquid state, or the opening degree of the electronic expansion valve is controlled to be increased, so that the refrigerant is in a full gas state, the heating standby refrigerant state is controlled through differentiation, and the noise of the machine in the machine halt state is reduced.
Optionally, the method further comprises: if the difference values of all the internal machines are smaller than the first threshold value, determining a common internal machine and an unusual internal machine according to the starting frequency and/or the starting duration of each internal machine; if the internal machine is a common internal machine, reducing the opening of an electronic expansion valve of the common internal machine so that the difference value is larger than the first threshold value; and if the internal machine is an unusual internal machine, increasing the opening of the electronic expansion valve of the unusual internal machine so that the difference value is smaller than a second threshold value.
In the embodiment of the invention, if the difference value of all the internal machines is smaller than the first threshold value, the internal machines are required to be controlled in a differentiated mode, the reliability risk caused by the total gas or the total liquid of the refrigerant is avoided, the common internal machine is controlled in a total liquid state according to the control target, and the unusual internal machine is controlled in a total gas state according to the control target.
Optionally, the determining the common internal machine and the unusual internal machine according to the opening duration of each internal machine includes: acquiring running average time length of all the internal machines; and if the starting time of any internal machine is longer than the running average time, determining that the internal machine is a common internal machine, otherwise, determining that the internal machine is not a common internal machine.
In the embodiment of the invention, the internal machine with the running average time length longer than the running average time length is determined as the common internal machine, and the rest internal machines are determined as the unusual internal machines, so that whether the internal machines are commonly used or not is accurately calculated, and the differential control effect is improved.
Optionally, the method further comprises: and if the difference values of all the internal machines are larger than a first threshold value, increasing the current opening of the electronic expansion valve of each internal machine.
According to the embodiment of the invention, the current opening degree of the electronic expansion valve of each internal machine can be increased, so that the circulating refrigerant quantity of the internal machine which is stopped is increased to a certain extent, and the risk of effusion of the internal machine is reduced. After the electronic expansion valve opening is increased, the difference may be reduced to be equal to or smaller than the first threshold value, and it is necessary to further reduce the electronic expansion valve opening so as to maintain the supercooling state.
Optionally, the value range of the first threshold is 3-7.
Optionally, the value range of the second threshold is-2-1.
Optionally, the first threshold value is 5, and the second threshold value is 0.
The embodiment of the invention provides the value range and the typical value of each threshold value, and based on the value range and the typical value, the differential control of the state of the heating standby refrigerant can be realized, and the noise of the machine in the machine halt process is reduced.
The embodiment of the invention provides a noise control device of a multi-split system, the multi-split system comprises a plurality of internal machines, and the device comprises: the acquisition module is used for acquiring the saturated temperature and the condensing temperature corresponding to the exhaust pressure of each internal machine and calculating the difference value between the saturated temperature and the condensing temperature of each internal machine; the condensing temperature is the acquisition temperature of a liquid pipe temperature sensing bulb at the inlet of the electronic expansion valve; the adjusting module is used for maintaining the current opening of the electronic expansion valve of each internal machine if the difference values of all the internal machines are larger than a first threshold value; if the difference value of part of the internal machines is smaller than the first threshold value, reducing the opening degree of the electronic expansion valve of part of the internal machines so that the difference value is larger than the first threshold value; if the opening degree of the electronic expansion valve of part of the internal machines is regulated to the minimum opening degree, increasing the opening degree of the electronic expansion valve of part of the internal machines so that the difference value is smaller than a second threshold value; the second threshold is less than the first threshold.
The embodiment of the invention provides a multi-split system, which is characterized by comprising a plurality of internal machines and a noise control device of the multi-split system.
Embodiments of the present invention provide a computer readable storage medium storing a computer program which, when read and executed by a processor, implements the above-described method.
The noise control device of the multi-split system and the multi-split system can achieve the same technical effect as the noise control method of the multi-split system.
Drawings
Fig. 1 is a pressure enthalpy diagram in an embodiment of the invention;
FIG. 2 is a schematic flow chart of a method for controlling noise of a multi-split air conditioner system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a noise control device of a multi-split air conditioning system according to an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
The noise mechanism analysis of the embodiment of the invention is as follows: the heating and stopping noise is mainly generated by the refrigerant flowing through the electronic expansion valve of the indoor unit. Further analysis, at the inlet of the electronic expansion valve, the state of the refrigerant is controlled, the pressure loss of the pipeline and the like are influenced, and the states of the refrigerant at the valve ports are different and are generally divided into three states of full liquid state, gas-liquid mixed state and full gas state. Wherein, the noise generated by the full liquid stable flow is smaller; forming stable annular flow under the full gas state, and blocking the outward transmission of noise by the adherent liquid film on the one hand, and making the noise inferior; in a gas-liquid mixed state, the refrigerant flow contains a large amount of bubbles and the like, and the valve needle of the electronic expansion valve and the bubbles are impacted to be broken through the electronic expansion valve, so that discontinuous 'gurgling' noise is generated, and the discontinuous 'gurgling' noise is one of main complaints of users in a heating standby state.
The embodiment of the invention combines a noise generation mechanism, and realizes the reduction of the using noise by differentially controlling the target supercooling degree.
The refrigerant state is detected and judged as follows:
when heating, the indoor unit is a condensing side, the high-temperature and high-pressure gaseous refrigerant is subjected to heat exchange, and the condensed medium-temperature and high-pressure liquid refrigerant is a part of gas and a part of liquid gas and liquid phases if insufficient condensation exists. As can be seen from the pressure enthalpy diagram shown in fig. 1, the refrigerant is in a full liquid state when it is at the left side of the saturation line, the refrigerant is in a full gas state when it is at the right side of the saturation line, and the refrigerant is in a superheated state; and the gas phase and the liquid phase are arranged between the saturated lines. In fig. 1, the left and right curves are saturation lines, the saturation lines are in a liquid state, and the outside is in a gas state.
The calculation formula of the saturation state: exhaust pressure corresponds to saturation temperature-condensation temperature=0
Wherein: the exhaust pressure corresponds to the saturation temperature, namely the temperature converted by the detection pressure of the high pressure sensor (the pressure temperature comparison table is available); the condensation temperature is the temperature of the liquid tube bulb at the inlet of the electronic expansion valve.
Therefore, the refrigerant state can be calculated from the saturation state:
1) Full liquid state: the exhaust pressure corresponds to the saturation temperature-condensation temperature not less than a
2) All-gaseous state: the exhaust pressure corresponds to a saturation temperature-condensation temperature < c
3) Mixed state of gas and liquid: c is less than or equal to the saturated temperature corresponding to the exhaust pressure, and the condensing temperature is less than a
Wherein, a is preferably 5, and the value range is 3-7, and the value is pipeline pressure loss (the pressure loss of the connecting pipeline of the internal machine and the external machine is ensured to be in a pure liquid state and a certain supercooling degree is required to be maintained); c is preferably 0, and the value range is-2-1.
The noise of the electronic expansion valve depends on the state of the refrigerant, the state of the refrigerant is controlled by the supercooling degree at the inlet of the electronic expansion valve, the supercooling degree is high, the refrigerant is in a liquid state, and the refrigerant is in a gas-liquid mixed state or in a gas state.
The noise reduction control principle is as follows:
the fan of the internal machine is closed when the machine is stopped, the condensation amount is natural convection heat exchange, and the condensation amount is constant under the same condition. When the refrigerant flow is small, the heat transfer formula is as follows:
Q＝(t 1 -t 2 )hA
wherein Q is heat, h is the total heat transfer coefficient of the system, and A is the inner surface area of the evaporator. t is t 1 For evaporator surface temperature, t 2 Is the air temperature.
The heat transfer amount is constant as can be obtained by the above formula. And the indoor heat exchanger outlet temperature is determined based on the following equation:
Q＝(t 3 -t 4 )C V ρV
wherein C is V Specific heat capacity of fluid in the pipe is determined, ρ is fluid density, and V is evaporator fluid volume, namelyt 3 At inlet temperature t 4 Is the outlet temperature; and (3) export:
the smaller the available volumetric flow on the right side of the formula, i.e. the smaller the degree of supercooling. Conversely, the same amount of condensation will have a larger temperature difference.
When the refrigerant flow is large, the same condensation amount has smaller temperature difference. And the refrigerant flow is regulated by an electronic expansion valve. Therefore, when the temperature difference is small, the electronic expansion valve can be closed, the flow of the refrigerant is reduced, and a larger supercooling degree (the supercooling degree is the high-pressure saturation temperature-the inlet temperature of the electronic expansion valve) is realized. However, due to the limitation of the valve body adjusting range, partial scenes (such as high-temperature heating) cannot ensure that all internal machines are in a supercooled state, namely full liquid, so that the internal machines in different rooms need to be controlled differently.
Fig. 2 is a schematic flow chart of a noise control method of a multi-split system according to an embodiment of the present invention, where the multi-split system includes a plurality of internal units, and the method includes the following steps:
s202, obtaining the corresponding saturation temperature and condensation temperature of the exhaust pressure of each internal machine, and calculating the difference value of the saturation temperature and the condensation temperature of each internal machine.
The condensing temperature is the temperature collected by a liquid tube temperature sensing bulb at the inlet of the electronic expansion valve.
The high pressure side of the existing multi-split system is in a communication state, the pressure is in balance (the pressure loss of a pipeline is negligible), and the condensation temperature is located at the inlet of the electronic expansion valve, so that the supercooling degree can be calculated more accurately by adopting the high pressure and the condensation temperature. In the prior art, a control scheme of parameters such as coil temperature, exhaust temperature and the like is adopted, and because the tube temperature falling machine is larger than the pressure, the calculation deviation is obviously increased, and the corresponding control effect is poor.
And S204, if the difference value of all the internal machines is larger than the first threshold value, maintaining the current opening degree of the electronic expansion valve of each internal machine.
Under the condition, all internal machines are in a supercooled state, so that the noise is low, and the current control state can be maintained.
Optionally, under the above circumstances, the current opening degree of the electronic expansion valve of each internal machine may be increased, so as to increase the circulating refrigerant quantity of the internal machine to a certain extent, and reduce the risk of effusion of the internal machine. After the electronic expansion valve opening is increased, the difference may be reduced to be equal to or smaller than the first threshold value, and it is necessary to further reduce the electronic expansion valve opening so as to maintain the supercooling state.
And S206, if the difference value of the partial internal machines is smaller than a first threshold value, reducing the opening degree of the electronic expansion valve of the partial internal machines so that the difference value is larger than the first threshold value.
Under the condition, the refrigerant of the partial internal machine is in a gas-liquid mixed state when flowing through the electronic expansion valve, so that the opening degree of the electronic expansion valve can be reduced, and the refrigerant is in a full-liquid state.
And S208, if the opening degree of the electronic expansion valve of the part of the internal machines is regulated to the minimum opening degree, increasing the opening degree of the electronic expansion valve of the part of the internal machines so that the difference value is smaller than a second threshold value.
If the opening of the electronic expansion valve of the partial internal machine is reduced to reach the regulation limit and still cannot meet the full liquid state, the electronic expansion valve needs to be controlled to be in a full gas state. Based on the above, the opening degree of the electronic expansion valve of the partial internal machine can be increased until the difference is smaller than the second threshold value, so that the refrigerant is in an all-gas state.
According to the noise control method for the multi-split air conditioner system, the gas-liquid state of the refrigerant flowing through the electronic expansion valve is determined according to the difference value of the saturated temperature and the condensing temperature corresponding to the exhaust pressure, the opening degree of the electronic expansion valve is controlled to be reduced, so that the refrigerant is in a full liquid state, or the opening degree of the electronic expansion valve is controlled to be increased, so that the refrigerant is in a full gas state, the heating standby refrigerant state is controlled through differentiation, and the noise of the machine in the machine halt state is reduced.
Further, if the difference value of all the internal machines is smaller than the first threshold value, the internal machines are required to be controlled in a differentiated mode, and reliability risks caused by the refrigerant total gas or total liquid are avoided. Based on this, the above method may further comprise the steps of:
if the difference values of all the internal machines are smaller than the first threshold value, determining the common internal machine and the unusual internal machine according to the starting frequency and/or the starting duration of each internal machine; and determining the internal machine with higher starting frequency as the common internal machine, and determining the internal machine with longer starting time as the common internal machine.
If the internal machine is a common internal machine, reducing the opening of an electronic expansion valve of the common internal machine to enable the difference value to be larger than a first threshold value; if the internal machine is an unusual internal machine, the opening degree of the electronic expansion valve of the unusual internal machine is increased so that the difference value is smaller than a second threshold value.
And the common internal machine is controlled in a full liquid state according to the control target, and the unusual internal machine is controlled in a full gas state according to the control target.
Optionally, determining the common internal machine and the unusual internal machine based on the following manner includes: acquiring the running average time length of all internal machines; if the opening time length of any internal machine is longer than the running average time length, the internal machine is determined to be a common internal machine, otherwise, the internal machine is determined to be a non-common internal machine. And determining the internal machines with the running average time length larger than the running average time length as common internal machines and determining the rest internal machines as non-common internal machines through the running average time length of all the internal machines, thereby accurately calculating whether the internal machines are commonly used or not and improving the differential control effect.
Optionally, the value range of the first threshold is 3-7.
Optionally, the value range of the second threshold is-2-1.
Illustratively, the first threshold value is 5 and the second threshold value is 0.
The control logic of the opening degree of the electronic expansion valve in each different state is described in detail below.
State 1: the corresponding saturated temperature-condensing temperature of the exhaust pressure of all internal machines is more than or equal to a
The control action is as follows: at this time, the indoor units are in supercooling states, the noise is good, the current control is maintained, namely when the exhaust pressure of the indoor units corresponds to the saturated temperature-condensing temperature > a, the opening of the electronic expansion valve of the indoor units is increased, and otherwise, the opening of the electronic expansion valve of the indoor units is reduced.
State 2: the exhaust pressure of the part of internal machines corresponds to the saturated temperature-condensing temperature < a, and the opening of the electronic expansion valve of the part of internal machines is minimum;
the control action is as follows: (1) the exhaust pressure corresponds to the internal machine with the saturation temperature-condensation temperature being more than or equal to a, and normal control is maintained; (2) the exhaust pressure corresponds to the saturated temperature-the condensing temperature < a, and at the moment, the electronic expansion valve is proved to reach the regulation limit and still cannot meet the full liquid state, so that the noise risk of the gas-liquid mixed state is high, and the gas-liquid mixed state needs to be regulated to be full gas state, as follows:
the exhaust pressure corresponds to the internal machine with the saturated temperature-condensing temperature less than a, and the target supercooling degree of the internal machine is from a to c at the moment, and the noise risk is reduced by controlling the total gas state.
State 3: the exhaust pressure of all the internal engines corresponds to the saturated temperature-condensing temperature < a, and the opening of the internal engine electronic expansion valve is minimum;
the control action is as follows: at this time, according to the usage habit, it is estimated which rooms are common rooms, and which rooms are unusual rooms, and it is usually determined according to the opening frequency and the time.
The calculating method comprises the following steps: h1, the running time of the room, namely the running average time of all rooms is more than 0, is a common room, and otherwise is a non-common room. Specifically, the room is commonly used: controlling according to the maintenance of the full liquid state; unusual rooms: the control target is changed into full gas control.
According to the multi-split noise control method provided by the embodiment of the invention, the noise of the internal machine during shutdown is reduced by differentially controlling the state of the refrigerant in the heating standby state; the reliability risk caused by total gas or total liquid is avoided through differential control.
Fig. 3 is a schematic structural diagram of a noise control device of a multi-split system according to an embodiment of the present invention, where the multi-split system includes a plurality of internal units, and the device includes:
an obtaining module 301, configured to obtain a saturation temperature and a condensation temperature corresponding to an exhaust pressure of each internal machine, and calculate a difference between the saturation temperature and the condensation temperature of each internal machine; the condensing temperature is the acquisition temperature of a liquid pipe temperature sensing bulb at the inlet of the electronic expansion valve;
the adjusting module 302 is configured to maintain a current opening degree of the electronic expansion valve of each internal machine if the difference values of all the internal machines are greater than a first threshold value;
if the difference value of part of the internal machines is smaller than the first threshold value, reducing the opening degree of the electronic expansion valve of part of the internal machines so that the difference value is larger than the first threshold value;
if the opening degree of the electronic expansion valve of part of the internal machines is regulated to the minimum opening degree, increasing the opening degree of the electronic expansion valve of part of the internal machines so that the difference value is smaller than a second threshold value; the second threshold is less than the first threshold.
According to the noise control device for the multi-split air conditioner system, provided by the embodiment of the invention, the gas-liquid state of the refrigerant flowing through the electronic expansion valve is determined according to the difference value of the saturated temperature and the condensing temperature corresponding to the exhaust pressure, the opening degree of the electronic expansion valve is controlled to be reduced, so that the refrigerant is enabled to be in a full liquid state, or the opening degree of the electronic expansion valve is controlled to be increased, so that the refrigerant is enabled to be in a full gas state, the state of the refrigerant in a heating standby state is controlled through differentiation, and the noise of an internal machine during shutdown is reduced.
As a possible way, the adjustment module is further configured to: if the difference values of all the internal machines are smaller than the first threshold value, determining a common internal machine and an unusual internal machine according to the starting frequency and/or the starting duration of each internal machine; if the internal machine is a common internal machine, reducing the opening of an electronic expansion valve of the common internal machine so that the difference value is larger than the first threshold value; and if the internal machine is an unusual internal machine, increasing the opening of the electronic expansion valve of the unusual internal machine so that the difference value is smaller than a second threshold value.
As a possible way, the adjustment module is further configured to: acquiring running average time length of all the internal machines; and if the starting time of any internal machine is longer than the running average time, determining that the internal machine is a common internal machine, otherwise, determining that the internal machine is not a common internal machine.
As a possible way, the adjustment module is further configured to: and if the difference values of all the internal machines are larger than a first threshold value, increasing the current opening of the electronic expansion valve of each internal machine.
As a possible way, the value range of the first threshold is 3 to 7.
As a possible way, the value range of the second threshold value is-2 to 1.
As a possible way, the first threshold value is 5, and the second threshold value is 0.
The embodiment of the invention provides a multi-split system, which comprises a plurality of internal machines and a noise control device of the multi-split system.
The embodiment of the invention also provides a computer readable storage medium, which stores a computer program, and when the computer program is read and run by a processor, the method provided by the embodiment is realized, the same technical effect can be achieved, and the repetition is avoided, so that the description is omitted. Wherein the computer readable storage medium is selected from Read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk.
Of course, it will be appreciated by those skilled in the art that implementing all or part of the above-described methods in the embodiments may be implemented by a computer level to instruct a control device, where the program may be stored in a computer readable storage medium, and the program may include the above-described methods in the embodiments when executed, where the storage medium may be a memory, a magnetic disk, an optical disk, or the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.

Claims (10)

1. A method for controlling noise of a multi-split system, wherein the multi-split system comprises a plurality of internal machines, the method comprising:
obtaining the corresponding saturated temperature and condensing temperature of the exhaust pressure of each internal machine, and calculating the difference value between the saturated temperature and condensing temperature of each internal machine; the condensing temperature is the acquisition temperature of a liquid pipe temperature sensing bulb at the inlet of the electronic expansion valve;
if the difference values of all the internal machines are larger than a first threshold value, maintaining the current opening of the electronic expansion valve of each internal machine;
if the difference value of part of the internal machines is smaller than the first threshold value, reducing the opening degree of the electronic expansion valve of part of the internal machines so that the difference value is larger than the first threshold value;
if the opening degree of the electronic expansion valve of part of the internal machines is regulated to the minimum opening degree, increasing the opening degree of the electronic expansion valve of part of the internal machines so that the difference value is smaller than a second threshold value; the second threshold is less than the first threshold.
2. The method of claim 1, wherein the method further comprises:
if the difference values of all the internal machines are smaller than the first threshold value, determining a common internal machine and an unusual internal machine according to the starting frequency and/or the starting duration of each internal machine;
if the internal machine is a common internal machine, reducing the opening of an electronic expansion valve of the common internal machine so that the difference value is larger than the first threshold value;
and if the internal machine is an unusual internal machine, increasing the opening of the electronic expansion valve of the unusual internal machine so that the difference value is smaller than a second threshold value.
3. The method of claim 2, wherein the determining the common internal machine and the unusual internal machine according to the on-time of each internal machine comprises:
acquiring running average time length of all the internal machines;
and if the starting time of any internal machine is longer than the running average time, determining that the internal machine is a common internal machine, otherwise, determining that the internal machine is not a common internal machine.
4. The method of claim 1, wherein the method further comprises:
and if the difference values of all the internal machines are larger than a first threshold value, increasing the current opening of the electronic expansion valve of each internal machine.
5. The method of any one of claims 1-4, wherein the first threshold has a value in the range of 3 to 7.
6. The method of any one of claims 1-4, wherein the second threshold has a value in the range of-2 to 1.
7. The method of any of claims 1-4, wherein the first threshold value is 5 and the second threshold value is 0.
8. A multi-split system noise control device, wherein the multi-split system includes a plurality of internal machines, the device includes:
the acquisition module is used for acquiring the saturated temperature and the condensing temperature corresponding to the exhaust pressure of each internal machine and calculating the difference value between the saturated temperature and the condensing temperature of each internal machine; the condensing temperature is the acquisition temperature of a liquid pipe temperature sensing bulb at the inlet of the electronic expansion valve;
the adjusting module is used for maintaining the current opening of the electronic expansion valve of each internal machine if the difference values of all the internal machines are larger than a first threshold value;
if the difference value of part of the internal machines is smaller than the first threshold value, reducing the opening degree of the electronic expansion valve of part of the internal machines so that the difference value is larger than the first threshold value;
if the opening degree of the electronic expansion valve of part of the internal machines is regulated to the minimum opening degree, increasing the opening degree of the electronic expansion valve of part of the internal machines so that the difference value is smaller than a second threshold value; the second threshold is less than the first threshold.
9. A multi-split system, comprising a plurality of internal machines and the multi-split system noise control device according to claim 8.
10. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program which, when read and run by a processor, implements the method according to any of claims 1-7.
CN202311508333.0A 2023-11-13 2023-11-13 Noise control method and device for multi-split air conditioner system and multi-split air conditioner system Pending CN117553413A (en)

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