CN110410967B - Control method for pipeline noise of multi-split air conditioning system and multi-split air conditioning system - Google Patents
Control method for pipeline noise of multi-split air conditioning system and multi-split air conditioning system Download PDFInfo
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- CN110410967B CN110410967B CN201910596989.XA CN201910596989A CN110410967B CN 110410967 B CN110410967 B CN 110410967B CN 201910596989 A CN201910596989 A CN 201910596989A CN 110410967 B CN110410967 B CN 110410967B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
- F24F2013/247—Active noise-suppression
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Abstract
The invention provides a method for controlling the pipeline noise of a multi-split air-conditioning system and the multi-split air-conditioning system. The control method of the invention does not need to change the existing air-conditioning pipeline, and only needs to change the control program logic of the opening of the electronic expansion valve of the indoor unit, thereby saving the cost, controlling the noise and simultaneously ensuring the reliability of the system.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method for controlling pipeline noise of a multi-split air-conditioning system and the multi-split air-conditioning system.
Background
The multi-split air conditioning system is provided with a plurality of indoor units which are used in parallel, in a heating mode, part of pipelines of the indoor units are in a starting state, and part of pipelines are in a standby state, in order to ensure the reliability of the multi-split air conditioning system, an electronic expansion valve of the indoor unit in the heating standby pipeline can maintain a certain opening degree, but a refrigerant in the heating state is generally in a gas-liquid two-phase state in front of the electronic expansion valve of the indoor unit, the refrigerant in the gas-liquid two-phase state contains a large amount of bubbles, when the refrigerant in the gas-liquid two-phase state passes through a small opening of the electronic expansion valve of the indoor unit, the large bubbles are crushed to generate squeak sound, and most of the remaining gas-liquid two-phase refrigerant collides with the; normally, the opening of an electronic expansion valve of the indoor unit which is initially set is 60pls, the flow state of a gas-liquid two-phase refrigerant in the standby pipeline fluctuates greatly, and the gas-liquid two-phase refrigerant causes the standby pipeline to be in a semi-cavity state, so that the liquid flow noise effect is amplified.
The liquid flow noise of the heating standby pipeline of the multi-split air-conditioning system is large and continuous, user experience is affected, the noise of the heating standby pipeline of the multi-split air-conditioning system needs to be controlled, and meanwhile, the system reliability of the multi-split air-conditioning system needs to be guaranteed, namely, a proper balance point is searched between the pipeline noise and the system reliability, so that the pipeline noise can be reduced, and the reliability of the system can be guaranteed.
In the prior art, the problem of liquid flow noise is solved by adding a capillary tube in a pipeline, but the addition of the capillary tube needs to modify the existing pipeline, the pipeline modification cost is high, and the capillary tube has no other beneficial effects except for reducing the pipeline noise, so that a simpler and more feasible method for reducing the pipeline noise needs to be provided.
Disclosure of Invention
In order to solve the problems, the invention provides a method for controlling the pipeline noise of a multi-split air-conditioning system and the multi-split air-conditioning system, which solve the problem of pipeline liquid flow noise caused by large initial opening of an electronic expansion valve of a standby pipeline indoor unit in the prior art by controlling the opening of the electronic expansion valve of the standby pipeline indoor unit for heating, and simultaneously ensure the system reliability of the multi-split air-conditioning system.
The invention provides a method for controlling the noise of pipelines of a multi-split air-conditioning system, wherein the multi-split air-conditioning system comprises an indoor unit heating starting-up pipeline and an indoor unit heating standby pipeline, an electronic expansion valve is arranged on the indoor unit pipeline, and the noise of the indoor unit heating standby pipeline is controlled by controlling the opening degree and the opening and closing mode of the electronic expansion valve on the indoor unit heating standby pipeline.
The control method of the invention does not need to change the existing air-conditioning pipeline, and only needs to change the control program logic of the opening of the electronic expansion valve of the indoor unit, thereby saving the cost, controlling the noise and simultaneously ensuring the reliability of the system.
Further, the control method specifically comprises the following steps:
step (ii) ofS1: when the heating standby pipeline is in an initial state, the electronic expansion valve of the indoor unit of the standby pipeline is in an initial opening PMVTo be treated 1；
Step S2: respectively detecting the temperature T of a gas-liquid pipeline of a heating standby pipeline in the heating operation process of a multi-split air-conditioning systemQi (Qi)And TLiquid for treating urinary tract infectionDetecting the discharge temperature T of the compressorExhaust of gasesCalculating the superheat degree of the standby pipeline according to the measurement result;
step S3: when the multi-split air conditioning system meets a specific opening condition, the opening degree of an electronic expansion valve of an indoor unit of the standby pipeline is PMVTo be treated 1Slowly increasing to PMVTo be treated 2；
Step S4: when the multi-split air conditioning system meets a specific closing condition, the opening degree of an electronic expansion valve of an indoor unit of the standby pipeline is PMVTo be treated 2Slow reduction to PMVTo be treated 1。
The opening of the electronic expansion valve is controlled to be slowly increased and decreased according to set conditions, the noise of the indoor unit heating standby pipeline can be reduced on the premise of ensuring the reliability of the system, and the opening of the electronic expansion valve is slowly changed, so that the flow speed of a refrigerant is stably changed, and extra noise cannot be generated.
Further, the initial opening PMVTo be treated 1＝25pls。
After a plurality of times of test comparison, the electronic expansion valve of the indoor unit of the standby pipeline is at the opening PMVTo be treated 1When the pressure is 25pls, the refrigerant in the standby pipeline flows in a liquid state in a dripping shape, the flowing fluctuation is small, the refrigerant on one side of the indoor unit cannot flow back to the compressor in time, the indoor unit heating standby pipeline is gradually filled with the liquid refrigerant and is in a liquid loading state, the semi-cavity state of the standby pipeline is eliminated, and meanwhile, the liquid refrigerant can cause the sound damping to increase, so that the effect of reducing the noise of the pipeline is achieved, and the initial opening degree is set to be 25 pls.
Further, PMVTo be treated 2＝40pls。
After a plurality of times of test comparison, the electronic expansion valve of the indoor unit of the standby pipeline is in PMV stateTo be treated 2When the refrigerant flow rate is 40pls, the refrigerant in the standby pipeline flows slowly, the flow fluctuation is small, and the refrigerant can be dissolvedExcept the liquid accumulation state of the standby pipeline, no extra liquid flow noise is generated at the same time.
Further, the degree of superheat of the standby line is represented by Δ TTemperature difference of gas-liquid pipeline＝TQi (Qi)-TLiquid for treating urinary tract infectionTo indicate.
Further, the specific turn-on condition is any one of the following two conditions:
firstly, the temperature difference delta T of the current gas-liquid pipelineTemperature difference of current gas-liquid pipelineLess than or equal to the preset minimum value delta T of temperature difference of gas-liquid pipelinesSetting temperature difference min of gas-liquid pipelineWhen the current is over;
opening PMV of electronic expansion valve of indoor unit of heating starting-up pipelineOpening deviceLess than or equal to 300pls, and TExhaust of gases≤80 ℃。
When the temperature difference of the gas-liquid pipeline is less than or equal to the preset minimum value of the temperature difference of the gas-liquid pipeline or the exhaust temperature of the compressor is low, the refrigerant supply quantity of the multi-split air-conditioning system is insufficient, the opening degree of the electronic expansion valve needs to be increased, and the flow speed of the refrigerant is increased, so that the supply quantity of the refrigerant is increased.
Further, Δ TSetting temperature difference min of gas-liquid pipeline＝23℃。
The parameters are selected according to multiple tests, so that the reliability of the system is guaranteed, and energy is saved.
Further, the specific shutdown condition is any one of the following two conditions:
firstly, the temperature difference delta T of the current gas-liquid pipelineTemperature difference of current gas-liquid pipelineNot less than the preset maximum value delta T of temperature difference of gas-liquid pipelineSetting the temperature difference max of the gas-liquid pipelineWhen the current is over;
opening PMV of electronic expansion valve of indoor unit of heating starting-up pipelineOpening deviceNot less than 350pls and TExhaust of gases≥95 ℃。
When the temperature difference of the gas-liquid pipeline is greater than or equal to the preset maximum value of the temperature difference of the gas-liquid pipeline or the exhaust temperature of the compressor is high, indicating that the supply quantity of the refrigerant of the multi-split air-conditioning system is excessive, the opening degree of the electronic expansion valve needs to be reduced, and the flow speed of the refrigerant is reduced, so that the supply quantity of the refrigerant is reduced.
Further, ΔTSetting the temperature difference max of the gas-liquid pipeline＝50℃。
The parameters are selected according to multiple tests, so that the reliability of the system is guaranteed, and energy is saved.
The invention also provides a multi-split air conditioning system, which comprises a compressor, a processor and a memory, wherein the processor is connected with the compressor and the memory, and the memory stores a program, and the program is executed by the processor to realize the steps of the control method.
Drawings
Fig. 1 is a flowchart illustrating a control method of a multi-split air conditioning system according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a multi-split air conditioning system according to an embodiment of the present invention;
description of reference numerals:
1-an outdoor unit; 2-an indoor unit; 3-a compressor; 4-a gas-liquid separator; a 5-four-way valve; 6-electronic expansion valve of indoor machine; 7-a temperature sensor; 8-ambient temperature sensor; 9-a defrost sensor; 10-a tracheal sensor; 11-liquid tube sensor; 12-an inspiration temperature sensor; 13-exhaust gas temperature sensor; 14-a high pressure sensor; 15-low pressure sensor.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1-2, a schematic diagram of a multi-split air conditioning system includes an outdoor unit 1 and three indoor units 2, the three indoor units 2 are connected in parallel and are respectively connected to the outdoor unit and the compressor 3, and an indoor unit electronic expansion valve 6, an air pipe sensor 10, and a liquid pipe sensor 11 are disposed on a pipe of each indoor unit.
The control method of the noise of the pipeline of the multi-split air conditioning system specifically comprises the following steps:
step S1: when the heating standby pipeline is in an initial state, the electronic expansion valve of the indoor unit of the standby pipeline is in an initial opening PMVTo be treated 1Initial opening PMVTo be treated 1Preferably PMVTo be treated 1＝25pls。
After a plurality of times of test comparison, the electronic expansion valve of the indoor unit of the standby pipeline is at the initial opening PMVTo be treated 1When the pressure is 25pls, the refrigerant in the standby pipeline flows in a liquid state in a dripping shape, the flowing fluctuation is small, the refrigerant on one side of the indoor unit 2 cannot flow back to the compressor 3 in time due to the small opening degree of the electronic expansion valve of the indoor unit, the standby pipeline on one side of the indoor unit 2 is gradually filled with the liquid refrigerant and is in a liquid accumulation state, the semi-cavity state of the standby pipeline is eliminated, and meanwhile, the liquid refrigerant can cause the sound damping to increase, so that the effect of reducing the noise of the pipeline is achieved.
Step S2: in the heating operation process of the multi-split air conditioning system, the gas-liquid pipeline temperature T of a heating standby pipeline is detected by using a gas pipe sensor 10 and a liquid pipe sensor 11 respectivelyQi (Qi)And TLiquid for treating urinary tract infectionDetecting the discharge temperature T of the compressor by means of a discharge temperature sensor 13Exhaust of gasesCalculating the superheat degree of the standby pipeline according to the measurement result, wherein the superheat degree of the standby pipeline is calculated by delta TTemperature difference of gas-liquid pipeline＝TQi (Qi)-TLiquid for treating urinary tract infectionTo indicate.
Step S3: when the multi-split air conditioning system meets any one of the following two conditions, the opening degree of the electronic expansion valve of the indoor unit of the standby pipeline is controlled by PMVTo be treated 1Slowly increasing to PMVTo be treated 2Wherein PMVTo be treated 1＝25pls，PMVTo be treated 2The opening speed of the indoor unit electronic expansion valve is 1pls/min, the duration is 15min, and the valve opening operation interval of each standby indoor unit is 1min (the valve opening operation interval only corresponds to the case of two or more standby indoor units):
firstly, the temperature difference delta T of the current gas-liquid pipelineTemperature difference of current gas-liquid pipelineLess than or equal to the preset minimum value delta T of temperature difference of gas-liquid pipelinesSetting temperature difference min of gas-liquid pipelineIn which Δ TSetting temperature difference min of gas-liquid pipeline＝23℃；
Opening PMV of electronic expansion valve of indoor unit of heating starting-up pipelineOpening deviceLess than or equal to 300pls, and TExhaust of gases≤80 ℃；
When the temperature difference of the gas-liquid pipeline is less than or equal to the preset minimum value of the temperature difference of the gas-liquid pipeline or the exhaust temperature of the compressor is low, the refrigerant supply quantity of the multi-split air-conditioning system is insufficient, the electronic expansion valve of the indoor unit of the standby pipeline starts to be opened slowly, and the electronic expansion valve of the indoor unit of the standby pipeline is in PMV state after multiple tests and comparisonTo be treated 2When the pressure is 40pls, the refrigerant in the standby pipeline slowly flows, the flow fluctuation is small, the accumulated liquid state of the standby pipeline can be removed, meanwhile, no extra liquid flow noise is generated, the opening degree of the electronic expansion valve is increased, the refrigerant quantity supply of the multi-split air-conditioning system is improved, and the system reliability is ensured.
Step S4: when the multi-split air conditioning system meets any one of the following two conditions, the opening degree of the electronic expansion valve of the indoor unit of the standby pipeline is controlled by PMVTo be treated 2Slow reduction to PMVTo be treated 1Wherein PMVTo be treated 1＝25pls，PMVTo be treated 2The closing speed of the electronic expansion valve of the indoor unit is 1pls/min, the duration is 15min, and the valve closing operation interval of each standby indoor unit is 1min (the valve closing operation interval only aims at the condition that two or more standby indoor units exist):
firstly, the temperature difference delta T of the current gas-liquid pipelineTemperature difference of current gas-liquid pipelineNot less than the preset maximum value delta T of temperature difference of gas-liquid pipelineSetting the temperature difference max of the gas-liquid pipelineIn which Δ TSetting the temperature difference max of the gas-liquid pipeline＝50℃；
Opening PMV of electronic expansion valve of indoor unit of heating starting-up pipelineOpening deviceNot less than 350pls and TExhaust of gases≥95 ℃；
When the temperature difference of the gas-liquid pipeline is greater than or equal to the preset maximum value of the temperature difference of the gas-liquid pipeline or the exhaust temperature of the compressor is high, the situation that the refrigerant supply quantity of the multi-split air-conditioning system is too large is shown, and the electronic expansion valve of the indoor unit of the standby pipeline starts to be closed slowly until the indoor unit returns to the initial opening PMVTo be treated 1The standby pipeline on one side of the indoor unit 2 is gradually filled with liquid refrigerant and is in a liquid accumulation state, so that the refrigerant supply quantity of the multi-split air conditioning system is reduced, and the energy is saved.
The method for controlling the pipeline noise of the multi-split air-conditioning system does not need to change the existing air-conditioning pipeline, and only needs to change the control program logic of the opening degree of the electronic expansion valve of the indoor unit.
The invention also provides a multi-split air conditioning system, which comprises a compressor, a processor and a memory, wherein the processor is connected with the compressor and the memory, the memory stores a program, and the program is executed by the processor to realize the steps of the control method.
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 (8)
1. The control method of the noise of the pipeline of the multi-split air-conditioning system comprises an indoor unit heating starting-up pipeline and an indoor unit heating standby pipeline, wherein an electronic expansion valve is arranged on the indoor unit pipeline, and the control method is characterized in that: controlling the noise of the indoor unit heating standby pipeline by controlling the opening degree, opening and closing modes of an electronic expansion valve on the indoor unit heating standby pipeline; the control method specifically comprises the following steps:
step S1: when the heating standby pipeline is in an initial state, the electronic expansion valve of the indoor unit of the standby pipeline is in an initial opening PMVTo be treated 1；
Step S2: respectively detecting the temperature T of a gas-liquid pipeline of a heating standby pipeline in the heating operation process of a multi-split air-conditioning systemQi (Qi)And TLiquid for treating urinary tract infectionDetecting the discharge temperature T of the compressorExhaust of gasesCalculating the superheat degree of the standby pipeline according to the measurement result;
step S3: when the multi-split air conditioning system meets a specific opening condition, the opening degree of an electronic expansion valve of an indoor unit of the standby pipeline is PMVTo be treated 1Slowly increasing to PMVTo be treated 2；
Step S4: when the multi-split air conditioning system meets a specific closing condition, the opening degree of an electronic expansion valve of an indoor unit of the standby pipeline is PMVTo be treated 2Slow reduction to PMVTo be treated 1；
Initial opening PMVTo be treated 1＝25pls。
2. The method for controlling noise of pipelines of a multi-split air conditioning system as claimed in claim 1, wherein: PMVTo be treated 2＝40pls。
3. The method for controlling noise of pipelines of a multi-split air conditioning system as claimed in claim 1, wherein: delta T for superheat degree of standby pipelineTemperature difference of gas-liquid pipeline＝TQi (Qi)-TLiquid for treating urinary tract infectionTo indicate.
4. The method for controlling noise of pipelines of a multi-split air conditioning system as claimed in claim 1, wherein: the specific turn-on condition is either one of the following two conditions:
firstly, the temperature difference delta T of the current gas-liquid pipelineTemperature difference of current gas-liquid pipelineLess than or equal to the preset minimum value delta T of temperature difference of gas-liquid pipelinesSetting temperature difference min of gas-liquid pipelineWhen the current is over;
opening PMV of electronic expansion valve of indoor unit of heating starting-up pipelineOpening deviceLess than or equal to 300pls, and TExhaust of gases≤80℃。
5. The method for controlling noise of pipelines of a multi-split air conditioning system as claimed in claim 4, wherein: delta TSetting temperature difference min of gas-liquid pipeline＝23℃。
6. The method for controlling noise of pipelines of a multi-split air conditioning system as claimed in claim 1, wherein: the specific shutdown condition is either one of the following two conditions:
firstly, the temperature difference delta T of the current gas-liquid pipelineTemperature difference of current gas-liquid pipelineNot less than the preset maximum value delta T of temperature difference of gas-liquid pipelineSetting the temperature difference max of the gas-liquid pipelineWhen the current is over;
opening PMV of electronic expansion valve of indoor unit of heating starting-up pipelineOpening deviceNot less than 350pls and TExhaust of gases≥95℃。
7. The method for controlling noise of pipelines of a multi-split air conditioning system as claimed in claim 6, wherein: delta TSetting the temperature difference max of the gas-liquid pipeline＝50℃。
8. A multi-split air conditioning system comprising a compressor, a processor and a memory, the processor being connected to the compressor and the memory, the memory storing a program, the program being executed by the processor to implement the steps of the control method according to any one of claims 1 to 7.
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| CN111023261B (en) * | 2019-12-17 | 2021-07-16 | 宁波奥克斯电气股份有限公司 | Method and device for reducing on-line noise of multi-connected unit and multi-connected unit |
| CN111503816B (en) * | 2020-04-29 | 2021-10-26 | 广东美的制冷设备有限公司 | Defrosting sound suppression method, storage medium, suppression device and air conditioner |
| CN112344537B (en) * | 2020-11-17 | 2021-09-07 | 珠海格力电器股份有限公司 | Noise reduction control method and device for indoor unit of multi-split air conditioner and multi-split air conditioner |
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| CN114754467B (en) * | 2022-02-28 | 2024-05-10 | 青岛海尔空调电子有限公司 | Control method of multi-split system |
| CN115614851B (en) * | 2022-10-12 | 2024-07-02 | 珠海格力电器股份有限公司 | Control method of multi-connected air conditioning unit, multi-connected air conditioning unit and computer readable storage medium |
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