CN113218035A - Control method for multi-split oil return noise reduction, storage medium and multi-split air conditioner - Google Patents

Control method for multi-split oil return noise reduction, storage medium and multi-split air conditioner Download PDF

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Publication number
CN113218035A
CN113218035A CN202110529648.8A CN202110529648A CN113218035A CN 113218035 A CN113218035 A CN 113218035A CN 202110529648 A CN202110529648 A CN 202110529648A CN 113218035 A CN113218035 A CN 113218035A
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oil return
noise reduction
air conditioner
split
split air
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CN113218035B (en
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肖旭东
黄春
陈东
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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
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • 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
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • 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
    • F24F11/88—Electrical aspects, e.g. circuits
    • 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
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication
    • F25B31/004—Lubrication oil recirculating arrangements
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Thermal Sciences (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides a control method for oil return and noise reduction of a multi-split air conditioner, a storage medium and a multi-split air conditionerThe noise control method comprises the following steps: s1: performing oil return operation when the operation parameters of the multi-split air conditioner meet preset conditions; s2: judging whether noise reduction control is met or not according to the supercooling degrees before and after oil return; s3: electromagnetic valve SV for opening noise reduction device1The refrigerant is circulated in the outdoor unit. The control method for the multi-split oil return noise reduction can effectively solve the problems of loud refrigeration operation airflow sound and control failure when the system lacks a refrigerant after oil return; pre-acting the oil return process, and shortening the time required by the secondary circulation of the refrigerant; and meanwhile, the time for quitting the noise reduction control is judged, and quitting is carried out in different modes, so that the influence on the normal operation of the multi-split air conditioner is reduced, and the user experience is good.

Description

Control method for multi-split oil return noise reduction, storage medium and multi-split air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method for oil return and noise reduction of a multi-split air conditioner, a storage medium and a multi-split air conditioner.
Background
The multi-connected air conditioning unit in the prior art is called multi-connected unit for short, and comprises one or more outdoor units, a plurality of indoor units connected in parallel and two refrigerant circulation main pipes for connecting each indoor unit and each outdoor unit. With the improvement of living standard, the multi-split air conditioner is more and more applied to places such as families, office places and the like. People's attention to the multi-split air conditioner is no longer limited to the temperature control effect or the energy saving aspect, and the noise of the air conditioner is also concerned. For the indoor unit, the noise source is mainly: 1) the motor drives the fan to operate to generate noise; 2) when the machine is running, the refrigerant throttling sound generated by the electronic expansion valve with a certain opening degree is the case of normal running, external machine oil return running, oil return after running and the like.
For example, when the multi-split air conditioner operates in a refrigerating mode, the multi-split air conditioner enters an oil return stage when the operating parameters meet certain conditions; when the multi-split air conditioner system executes the oil return instruction, the operation frequency of the compressor is high and the opening of the internal machine valve is large because the refrigerant carries a large amount of lubricating oil. After the oil return is finished, although the refrigeration oil in the system is brought back, a large amount of refrigerant is also stored in the outer machine liquid storage tank, and the following problems are easy to occur: 1. at the moment, the system is in a serious refrigerant shortage state, the inner machine valve is adjusted according to the temperature of the pipe, the inner machine valve is misjudged to be in the refrigerant shortage state of the system, and the abnormal opening phenomenon of the valve occurs. 2. The system lacks the refrigerant, and the super-cooling degree of the refrigerant that gets into the interior machine is not enough, and the refrigerant is in gaseous phase state, flows through the interior machine and sends obvious air current sound to the refrigerant circulates once more and needs longer time, and the noise lasts to a great extent, causes relatively poor user experience for the user.
Therefore, the prior art has the defects of inaccurate control after oil return, large air flow sound of the internal machine, poor user experience and the like.
Disclosure of Invention
The invention solves the problems of loud refrigeration operation airflow sound and control failure when a system lacks a refrigerant after oil return in the prior art, thereby improving the customer experience and satisfaction.
In order to solve the above problems, the present invention provides a control method for multi-split oil return and noise reduction, wherein S1: performing oil return operation when the operation parameters of the multi-split air conditioner meet preset conditions; s2: judging whether noise reduction control is met or not according to the supercooling degrees before and after oil return; s3: electromagnetic valve SV for opening noise reduction device1The refrigerant is circulated in the outdoor unit. Judging whether the noise of the internal machine occurs in the subsequent operation according to the change conditions of the supercooling degrees before and after oil return; correspondingly, after oil return is finished, an air bypass is opened, so that the problems of loud airflow sound and control failure of refrigeration operation when a system lacks a refrigerant after oil return are solved, and the user satisfaction is improved;
preferably, the step S1 includes: s101: when the operation parameters of the multi-split air conditioner meet preset conditions, oil return is carried out; s102, recording accumulated oil return time t2Judgment of tPreparation of-t2≤Δt1，tPreparation ofPresetting time length for oil return; if yes, go to step S103; if not, returning to the step S2; s103, detecting the running frequency f of the compressor1Simultaneously detecting and selecting an indoor unit M with the minimum capacity in operationminFor preparing the machine, the other internal machine valves are closed, and according to the internal machine MminDown-converting the compressor.
Wherein t isPreparation ofSetting according to experience and specific model, such as 10-50min, 15min, 25min, 35min, 45min, etc.; Δ t1Usually, it is set according to empirical values, such as 10-15 min. By regulating and controlling the oil return process, the influence of the oil return on the operation of the multi-split air-conditioning system is reduced as much as possible, and the refrigerant circulation can be recovered to be normal as soon as possible after the oil return.
Preferably, the control method further includes S0, determining whether to accept a "cooling or dehumidifying mode" command; if so, the process proceeds to step S1, and if not, the normal operation, for example, the heating mode operation, the defrosting mode operation, and the like is performed. The control method is limited to a refrigeration or dehumidification mode, noise reduction control of the air conditioner is facilitated, and interference on normal operation of the air conditioner is avoided.
Preferably, the step S2 includes: judgment of Tgl2+TTrimming 1＜Tgl1Or Tgl2If the temperature is less than 0 ℃, the step S3 is executed; if not, the operation is normal, wherein Tg11、Tg12Supercooling degrees before and after oil return, TTrimming 1Is 2-3 ℃.
In which the degree of supercooling Tg1＝Tpc-TdefI.e. high pressure corresponding to saturation temperature TpcAnd condenser outlet pipe temperature Tdef2A difference of (d); when the conditions are met, the supercooling degree of the multi-split air conditioner is insufficient, noise is easy to generate, and noise reduction control is needed; if the judgment is not satisfied, the supercooling degree of the multi-split air conditioner at the moment satisfies the condition, no noise is generated, and noise reduction control is not needed.
Preferably, the control method further includes: s4, judging whether the noise reduction control operation time length t is needed or not3＞Δt3Or Pd3＞PmaxOr Tgl3+TRepair 2＜Tgl1Or Tgl3If the temperature is less than 0 ℃, the noise reduction control is quitted; if not, return to S3, where Pd3For exhaust high pressure during noise reduction control, Tgl3Supercooling degree in noise reduction control, PmaxFor the high pressure upper limit set point, Δ t, of the multi-split air-fuel line3Is 15-20min, TRepair 2Is 0-2 ℃.
Preference is given toThe step S4 includes: s41, judging whether t is3＞Δt3Or Pd3＞PmaxOr Tgl3+TRepair 2＜Tgl1Or Tgl3If the temperature is less than 0 ℃, performing step S42; if not, the process returns to S3. S42, judging whether the running time length t is long or not1＞Δt4If yes, exiting the noise reduction control according to the first mode; if not, the second mode exits the noise reduction control, wherein Δ t4Is 0-10 min.
Preferably, the first mode includes: s421, adjusting the internal machine MminTo PMV0*K1Operating frequency of compressor to f1*K1And continuously running t4A duration; s422, closing electromagnetic valve SV of noise reduction device1Adjusting the internal machine MminTo PMV0*K2Operating frequency of compressor to f1*K2And continuously running t5The length of time.
If the refrigerant of the multi-split air conditioner is circulated and stable before oil return, the system can quickly return to the state before oil return by exiting control in two stages after the oil return is finished. Wherein K120% -60%, t4The value of (a) is set empirically, for example 30-50 s; k260% -100%, t5The value of (a) is set empirically, for example 50-80 s.
Preferably, the second mode includes: s423, closing the electromagnetic valve SV of the noise reducer1Adjusting the internal machine MminTo PMV1*K3The compressor continues at frequency f2Operating and continuously operating t6A duration; s424, adjusting the internal machine MminTo PMV1*K4Adjusting the frequency of the compressor to f0And continuously running t6A duration; s425, adjusting the internal machine MminTo PMV1*K5Maintaining the frequency of the compressor at f0And continuously running t7The length of time.
If the refrigerant is not circulated and stable before oil return of the multi-split air conditioner, the multi-split air conditioner is quitted and controlled in three stages after the oil return is finished so as to accurately regulate and control, avoid noise and ensure that the refrigerant is connected in an antithetical couplet after quitting and controllingThe circulation of the refrigerant in the machine system tends to be stable. Wherein PMV1The initial opening value is determined according to the type of the internal machine, and generally ranges from 100pls to 150pls, K320% -40%, K440% -80%, K580% -100%, t6、t7、t8Is set empirically, e.g. t6Is 10-20s, t7Is 20-30s, t8Is 20-30 s. F is f2Representing the operating frequency of the compressor before oil return.
Compared with the prior art, the control method for the oil return and noise reduction of the multi-split air conditioner has the following beneficial effects: (1) whether noise occurs in the internal unit in subsequent operation is judged according to the change of the supercooling degree of the multi-split air-conditioning unit before and after oil return, and after the oil return is finished, an air bypass is started, so that the problems of loud refrigeration operation airflow and control failure when a system lacks a refrigerant after the oil return is finished are solved, and the user satisfaction is improved; (2) pre-acting the oil return process, and shortening the time required by the secondary circulation of the refrigerant; meanwhile, the time for quitting the noise reduction control is judged, and quitting is carried out in different modes, so that the influence on the normal operation of the multi-split air conditioner is reduced, and the user experience is good.
The invention also provides a computer storage medium, on which a computer program is stored, and the computer program is characterized in that when executed, the control method for multi-online oil return noise reduction is realized.
The invention also provides a multi-split air conditioner, which comprises a computer readable storage medium and a processor, wherein the computer readable storage medium is used for storing a computer program, and the computer program is read by the processor and runs to realize the control method for oil return and noise reduction of the multi-split air conditioner. The computer storage medium and the multi-split air conditioner have the same beneficial effects as the control method, and are not described in detail herein.
Drawings
Fig. 1 is a flowchart of a control method for reducing noise in oil return of a multi-split air conditioning unit according to embodiment 1 of the present invention;
fig. 2 is a flowchart of a control method for reducing noise in oil return of a multi-split air conditioning unit according to embodiment 2 of the present invention;
fig. 3 is a flowchart of a control method for reducing noise in oil return of a multi-split air conditioning unit according to embodiment 3 of the present invention;
fig. 4 is a schematic structural diagram of a multi-split air conditioner according to an embodiment of the invention.
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.
The compressor needs lubricating oil for lubrication and cooling in operation and even plays a role in sealing; generally, lubricating oil and a refrigerant are mixed together and circulated simultaneously, and if the lubricating oil cannot continuously return to a compressor, the problem of insufficient lubricating oil occurs, which leads to the faults of increased abrasion of the compressor, reduced service life, overhigh internal temperature, burnout of a motor and the like.
The multi-split air-conditioning system generally includes an outdoor unit and a plurality of indoor units, wherein when the multi-split air-conditioning system operates under a partial load state, one part of the indoor units is in a normal on state, and the other part of the indoor units is in a standby or off state. Because the control after oil return is not fine, the air flow sound of the internal machine is larger, and the user experience is influenced.
It should be noted that, in the description of the present application, the terms "first", "second", "third", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The multi-split air conditioning system comprises an outdoor unit and a plurality of indoor units, wherein the indoor units are arranged in parallel, and the quantity words of the indoor units comprise two, three, four and the like integers. In addition, the number of the outdoor units of the multi-split air conditioning system of the present invention is not limited to one, and may be a plurality of outdoor units, and the number of the outdoor units is smaller than the number of the indoor units. In order to reduce or even eliminate the defects of large airflow sound of an internal machine of the multi-split air-conditioning system after oil return and poor user experience, the invention provides a control method for oil return and noise reduction of the multi-split air-conditioning system.
Example 1
As shown in fig. 1, a control method for oil return and noise reduction of a multi-split air conditioner includes an outdoor unit and a plurality of indoor units, where one part of the indoor units is in a normal on state and the other part is in a standby or off state, and the control method includes: the oil return control method is characterized by comprising the following steps:
s1: performing oil return operation when the operation parameters of the multi-split air conditioner meet preset conditions;
after the multi-split air conditioner enters a refrigeration or dehumidification mode, the indoor environment temperature T is continuously acquiredaiOutdoor ambient temperature TaoEvery Δ t0Obtaining exhaust gas high pressure Pd1Low pressure of suction Ps1High pressure corresponding to saturation temperature Tpc1Condenser outlet tube temperature Tdef1Recording the running time t1. Preferably, the Δ t0For example 4-8s, based on empirical values. If the load is switched and the shutdown is carried out at the temperature, t1And (4) automatic zero setting. And judging whether to carry out oil return operation according to the parameters. And judging whether oil return operation is performed or not according to the accumulated oil return operation time of the multi-split air conditioning unit, wherein the judging method and parameters are the prior art and are not described herein again.
S2: judging whether noise reduction control is met or not according to the supercooling degrees before and after oil return;
in which the degree of supercooling Tg1＝Tpc-TdefDetecting exhaust high pressure P by pressure sensors before and after oil returnd2Detecting condenser outlet tube temperature T by temperature sensordefAccording to exhaust gas high pressure Pd2To calculate the corresponding saturation temperature T of the high pressurepc. For example, when the supercooling degree after oil return is less than the supercooling degree before oil return, or the supercooling degree after oil return is less than 0 ℃, the supercooling degree of the multi-split air-conditioning system after oil return is insufficient, noise is easy to generate, and noise reduction control is needed; if the situations do not exist, the supercooling degree of the multi-split air conditioner after oil return meets the condition, noise is not generated, and therefore noise reduction control is not needed.
S3: an electromagnetic valve SV1 of the noise reduction device is opened to circulate the refrigerant on the outdoor unit side.
Specifically, the electromagnetic valve SV of the noise reduction device is opened1At this time, the refrigerant continues to circulate at the outer machine side, and the inner machine is in a ventilation state, and has no refrigerant flowing and abnormal noise. Preferably, the internal machine M with the smallest removal capacity is closedminAll external internal valve, internal MminAnd operating according to the current mode and the rotating speed.
As shown in fig. 4, the noise reduction device includes a copper pipe disposed between a liquid pipe and an air pipe of the outdoor unit, and the copper pipe is provided with an electromagnetic valve SV1(ii) a Preferably, the copper tubes are arranged through fins of the condenser. The heat exchange of the circulating refrigerant can be enhanced by the arrangement. Preferably, the liquid pipe and the gas pipe are respectively provided with a valve body, such as a stop valve, for controlling the switching of the refrigerant between the circulating pipeline and the copper pipe. When working, the electromagnetic valve SV is opened1The copper pipe is utilized to enable the refrigerant not to pass through the internal machine for circulation, noise formed indoors due to instability of the system after oil return is avoided, and user satisfaction is improved.
In a refrigeration and dehumidification mode, because the system pressure is high and the exhaust temperature of a press is high, most units run under low frequency for a long time due to a protection function, and lubricating oil on the side of a pipeline and an inner machine is accumulated more and more at the moment, so that oil return operation is needed; the oil return frequency of the multi-split air conditioning system depends on the number of the indoor units which are in standby or shutdown, that is, the more the number of the indoor units which are in standby or shutdown, the higher the frequency of executing the oil return instruction. Because the refrigerant carries a large amount of lubricating oil during the oil return operation, the running frequency of the compressor and the opening degree of an internal machine valve need to be increased; after oil return is finished, a large amount of refrigerant is stored in a liquid storage tank of the outer machine, the system is in a refrigerant lack state in a short time, the controller easily judges that the system lacks the refrigerant by mistake, and the phenomenon that the inner machine valve is abnormally opened is caused; meanwhile, the supercooling degree of the refrigerant entering the internal machine is insufficient, the refrigerant is in a gas phase state, obvious airflow sound is easily generated in the internal machine, and the noise is large. According to the change condition of the supercooling degree before and after oil return, whether noise reduction control needs to be carried out or not can be accurately reflected, the refrigerant circulates on the outer machine side by combining the noise reduction device, the inner machine is equivalently in a ventilation mode, the noise of the inner machine is effectively controlled, and the user experience is improved.
Example 2
As shown in fig. 2, a control method for multi-split oil return noise reduction includes the following steps:
s1, starting the multi-split air conditioner, and judging whether to accept a 'refrigerating or dehumidifying mode' instruction or not by the multi-split air conditioner;
for the multi-split air conditioner, if a 'refrigerating or dehumidifying mode' instruction is received after the multi-split air conditioner is started, the step S2 is carried out; and if a 'heating or ventilation mode' instruction is received, the system operates normally.
S2, acquiring the multi-split operation parameters and recording the operation time length t1；
The operating parameter comprises an indoor ambient temperature TaiOutdoor ambient temperature TaoEvery Δ t0Obtaining exhaust gas high pressure Pd1Low pressure of suction Ps1High pressure corresponding to saturation temperature Tpc1Condenser outlet tube temperature Tdef1Valve step value PMV of each internal machine0The rotating speed n of the external fan and the operating frequency f of the compressor2. Preferably, the Δ t0For example 4-8s, based on empirical values. Calculating the supercooling degree T at the momentg11I.e. before entering oil return operation in cooling mode, wherein Tg11＝Tpc1-Tdef1。
S3: the multi-split air conditioner performs oil return, detects the operation parameters after oil return and calculates the supercooling degree Tgl2(ii) a Judgment of Tgl2+TTrimming 1＜Tgl1Or Tgl2If the temperature is less than 0 ℃, the step S4 is executed; if not, the multi-split air conditioner normally operates.
The multi-split air conditioner judges whether to enter an oil return mode according to the accumulated oil return operation time, wherein the judgment method and parameters are the prior art and are not described herein again. When the judgment is in effect, the supercooling degree of the multi-split air conditioner is insufficient, noise is easy to generate, and noise reduction control is needed; if the judgment is not satisfied, the supercooling degree of the multi-split air conditioner at the moment satisfies the condition, and noise is not generated, so that noise reduction control is not needed. Wherein T isTrimming 1Is 2-3 ℃.
Preferably, the multi-split air conditioner performs oil return operation, and comprises the following steps; s31, recording the accumulated oil return time t2Judgment of tPreparation of-t2≤Δt1(ii) a If yes, go to step S32; if not, returning to the step S2;
s32, detecting the current compressor frequency f1Simultaneously detecting the capacities of the internal machines of the current start-up, and selecting the internal machine M with the minimum capacityminFor preparing the machine, the other internal machine valves are closed, and according to the internal machine MminDown-converting the compressor.
Wherein t isPreparation ofRepresenting the preset oil return time, and setting according to experience and specific machine types, such as 10-50min, which can be 15min, 25min, 35min, 45min, etc.; Δ t1Usually, it is set according to empirical values, such as 10-15 min. By regulating and controlling the oil return process, the influence of the oil return on the operation of the multi-split air-conditioning system is reduced as much as possible, and the refrigerant circulation can be recovered to be normal as soon as possible after the oil return.
And S4, performing noise reduction control by using the noise reduction device of the multi-split air conditioner.
Electromagnetic valve SV for opening noise reduction device1And recording the running time t3(ii) a At this time, the refrigerant is continuously circulated at the outer machine side, the inner machine is in a ventilation state, and no refrigerant flows through and abnormal noise exists. Preferably, every Δ t2Detecting exhaust gas high pressure Pd3Low pressure of suction Ps3High pressure corresponding to saturation temperature Tpc3Condenser outlet tube temperature Tdef3Where Δ t is2Set empirically, e.g. 2-5 s.
At this time, the internal machine MminThe other internal machines still operate according to the current mode and the rotating speed, and the valve bodies are kept closed, namely the opening degree is 0 pls; the rotating speed of the external fan is n, and the frequency of the compressor is f2And continuing to operate.
And S5, judging whether to exit the noise reduction control mode.
According to the length of operation time t3Or exhaust high pressure PdOr supercooling degree TglAnd judging whether the preset conditions are met or not, and judging whether the noise reduction control is quitted or not. E.g. t3Length of run or supercooling TglAfter a certain value is reached, the reaction kettle is opened,indicating that the refrigerant starts to circulate normally; when exhaust gas is at high pressure PdIf the voltage is higher than the upper limit, the system is unstable, and the control needs to be quitted to improve the reliability and stability of the multi-split air conditioner.
Example 3
As shown in fig. 3, a control method for multi-split oil return noise reduction includes the following steps:
s1, starting the machine, and judging whether the multi-split air conditioner receives a 'refrigeration or dehumidification mode' instruction;
s2, acquiring the multi-split operation parameters and recording the operation time length t1；
The operating parameter comprises an indoor ambient temperature TaiOutdoor ambient temperature TaoEvery Δ t0Obtaining exhaust gas high pressure Pd1Low pressure of suction Ps1High pressure corresponding to saturation temperature Tpc1Condenser outlet tube temperature Tdef1Valve step value PMV of each internal machine0The rotating speed n of the external fan and the operating frequency f of the compressor2. Preferably, the Δ t0For example 4-8s, based on empirical values.
Calculating the supercooling degree T at the momentg11I.e. before entering oil return operation in cooling mode, wherein Tg11＝Tpc1-Tdef1。
S3, entering an oil return mode, and recording the accumulated oil return time t2Judgment of tPreparation of-t2≤Δt1(ii) a If yes, go to step S4; if not, the process returns to step S2.
And judging whether to enter an oil return mode according to the accumulated oil return operation time of the multi-split air conditioner, wherein the judging method and parameters are the prior art and are not described herein again. Wherein t isPreparation ofRepresenting the preset oil return time, and setting according to experience and specific machine types, such as 10-50min, which can be 15min, 25min, 35min, 45min, etc.; Δ t1Usually, it is set according to empirical values, such as 10-15 min.
S4, detecting the current compressor frequency f1Simultaneously detecting the capacities of the internal machines of the current start-up, and selecting the internal machine M with the minimum capacityminFor preparing the machine, other internal valves are closed, according toInner machine MminDown-converting the compressor.
S5, recording the operation parameters of the multi-split air conditioner and calculating the supercooling degree T after the oil return is finishedgl2(ii) a Judgment of Tgl2+TTrimming 1＜Tgl1Or Tgl2If the temperature is less than 0 ℃, the step S6 is executed; if not, the multi-split air conditioner normally operates.
Wherein the operating parameter of the multi-split air conditioner comprises high exhaust pressure Pd2Low pressure of suction Ps2High pressure corresponding to saturation temperature Tpc2Condenser outlet tube temperature Tdef2And T isg12＝Tpc2-Tdef2. When the judgment is in effect, the supercooling degree of the multi-split air conditioner is insufficient, noise is easy to generate, and noise reduction control is needed; if the judgment is not satisfied, the supercooling degree of the multi-split air conditioner at the moment satisfies the condition, and noise is not generated, so that noise reduction control is not needed. Wherein T isTrimming 1Is 2-3 ℃.
Preferably, when the above conditions are satisfied, the display panel of the multi-line system lights up a "noise reduction control" indicator lamp or displays a code corresponding to the "noise reduction control" on the display panel.
And S6, performing noise reduction control by using the noise reduction device of the multi-split air conditioner.
Preferably, the noise reduction device is arranged between a liquid pipe and an air pipe of the outdoor unit, and the copper pipe is provided with an electromagnetic valve SV1(ii) a Preferably, the copper tubes are arranged through fins of the condenser. The heat exchange of the circulating refrigerant can be enhanced by the arrangement. As an example of the present invention, the liquid pipe and the gas pipe are respectively provided with a valve body, such as a stop valve, for controlling the switching between the refrigerant in the circulation pipeline and the copper pipe. When working, the electromagnetic valve SV is opened1The copper pipe is utilized to enable the refrigerant not to pass through the internal machine for circulation, noise formed indoors due to instability of the system after oil return is avoided, and user satisfaction is improved.
Specifically, the electromagnetic valve SV of the noise reduction device is opened1And recording the noise reduction operation time t3(ii) a At this time, the refrigerant is continuously circulated at the outer machine side, the inner machine is in a ventilation state, and no refrigerant flows through and abnormal noise exists. Preferably, every Δ t2Detecting exhaust gas high pressure Pd3Low pressure of suction Ps3High pressure corresponding to saturation temperature Tpc3Condenser outlet tube temperature Tdef3Where Δ t is2Set empirically, e.g. 2-5 s.
At this time, the internal machine MminThe other internal machines still operate according to the current mode and the rotating speed, and the valve bodies are kept closed, namely the opening degree is 0 pls; the rotating speed of the external fan is n, and the frequency of the compressor is f2And continuing to operate.
S7, judging whether the noise reduction operation time length t is needed3＞Δt3Or Pd3＞PmaxOr Tgl3+TRepair 2＜Tgl1Or Tgl3If the temperature is less than 0 ℃, the noise reduction control is quitted; if not, the process returns to S6.
Where Δ t3、TRepair 2Are all determined empirically, e.g. at3Is 15-20min, TRepair 2Is 0 to 2 ℃; when t is3＞Δt3In the normal condition, the refrigerant starts to circulate normally; similarly, when T isgl3+TRepair 2＜Tgl1Or Tgl3If the temperature is less than 0 ℃, the refrigerant quantity circulating in the multi-split air conditioner is restored to be normal, and the refrigerant also starts to circulate normally; furthermore, PmaxAdjusting the high-voltage upper limit of the multi-split air conditioner according to the machine type; when P is presentRow board＞PmaxWhen the noise reduction control of the multi-split air conditioner is close to the critical value, the reliability and stability of the multi-split air conditioner are easily affected by continuing the operation.
The applicant finds out through experiments that the running time t of the multi-split air conditioner in the refrigeration mode1That is, the running time before oil return determines whether the multi-split air conditioner runs stably before noise reduction control, and the noise after the noise reduction control is finished is also influenced; for this reason, applicants further optimize step S8.
The step S7 includes: s71, judging whether t is3＞Δt3Or PRow board＞PmaxOr Tgl3+TRepair 2＜Tgl1Or Tgl3If the temperature is less than 0 ℃, performing step S72; if not, the process returns to S6.
S72, judging whether the running time length t is long or not1＞Δt4If yes, exiting the noise reduction control according to the first mode; if not, the second mode exits the noise reduction control.
The Δ t4The value of (a) is set according to an empirical value, for example, 0-10 min; when the judgment condition is met, the multi-split air conditioner runs for a certain time before oil return, and at the moment, the refrigerant is stable in circulation in the system. On the contrary, the refrigerant circulation of the multi-split air conditioning system before oil return is not stable. When the noise reduction control is exited, t is compared1Returning to zero; simultaneously, the 'noise reduction control' indicator light that shows the lamp plate on the multi-connected air conditioner is closed.
The first mode is divided into two stages, including:
s73, adjusting the internal machine MminTo PMV0*K1Operating frequency of compressor to f1*K1And continuously running t4A duration;
s74 electromagnetic valve SV for closing noise reducer1Adjusting the internal machine MminTo PMV0*K2Operating frequency of compressor to f1*K2And continuously running t5A duration;
under the condition, the refrigerant of the multi-split air conditioner is stable in circulation before oil return; after the oil return is finished, the system can quickly return to the state before the oil return by exiting the control in two stages. Wherein K120% -60%, t4The value of (a) is set empirically, for example 30-50 s; k260% -100%, t5The value of (a) is set empirically, for example 50-80 s.
The second mode is divided into three stages, including:
s75 electromagnetic valve SV for closing noise reducer1Adjusting the internal machine MminTo PMV1*K3The compressor continues at frequency f2Operating and continuously operating t6A duration;
s76, adjusting the internal machine MminTo PMV1*K4Adjusting the frequency of the compressor to f0And continuously running t6A duration;
s77, adjusting the internal machine MminTo PMV1*K5Maintaining the frequency of the compressor at f0And continuously running t7A duration;
in this case, the refrigerant of the multi-split air conditioning unit is not circulated and stable before oil return; and after the oil return is finished, the control is quitted in three stages to accurately regulate and control, so that the noise is avoided, and the circulation of the refrigerant in the on-line system tends to be stable after the control is quitted. Wherein PMV1The initial opening value is determined according to the type of the internal machine, and generally ranges from 100pls to 150pls, K320% -40%, K440% -80%, K580% -100%, t6、t7、t8Is set empirically, e.g. t6Is 10-20s, t7Is 20-30s, t8Is 20-30 s. F is f2Representing the operating frequency of the compressor before oil return.
According to the control method for oil return and noise reduction of the multi-split air conditioner, when the multi-split air conditioner enters a refrigeration or dehumidification mode, the exhaust high pressure P is detected in real timedLow pressure of inspiration PsHigh pressure corresponds to saturation temperature PcCondenser exit tube temperature TdefThe valve step PMV of each indoor unit and the running time of the refrigeration mode are recorded; entering an oil return mode and selecting one of the currently running internal machines with the smallest capacity as a standby machine when oil return is to be finished, closing other internal machine valves and reducing the frequency of the compressor according to the capacity of the machine set; and after the oil return is finished, reading the operation parameters of the multi-split air conditioner again, and judging whether noise reduction control is needed or not through the supercooling degrees before and after the oil return. When the noise reduction control is needed, all internal machine valves except the preparation machine are closed, and the electromagnetic valve SV of the noise reduction device is opened1The certain running frequency of the press is kept, so that the refrigerant continues to circulate at the outer machine side, and the inner machine is in a ventilation state and has no abnormal noise; and detecting the running parameters of the multi-split air conditioner, and when the noise reduction control can be quitted, selecting to quit the noise reduction control mode through the running time of the refrigeration mode before oil return, so that the system quickly returns to the state before oil return, the phenomenon that the airflow sound of the internal machine is loud after the oil return is finished is avoided, and the user experience is further improved.
The embodiment also 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 method for controlling oil return and noise reduction of a multi-split air conditioner is implemented. The computer readable storage medium of the embodiment can reduce the noise of the internal machine on the premise of ensuring the normal oil return of the multi-split air conditioner.
The embodiment also provides an air conditioner, which comprises a computer readable storage medium and a processor, wherein the computer readable storage medium stores a computer program, and the computer program is read by the processor and runs to realize any one of the control methods for multi-split air conditioner oil return noise reduction. The air conditioner can carry out fine control after the oil return, effectively reduces or even eliminates the noise of the internal unit, and user experience is good.
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. The control method for multi-split oil return noise reduction is characterized in that S1: performing oil return operation when the operation parameters of the multi-split air conditioner meet preset conditions; s2: judging whether the 'noise reduction control' is met according to the supercooling degrees before and after oil return; s3: electromagnetic valve SV for opening noise reduction device1The refrigerant is circulated in the outdoor unit.
2. The control method for multi-split oil return noise reduction according to claim 1, wherein the step S1 includes: s101: when the operation parameters of the multi-split air conditioner meet preset conditions, oil return is carried out; s102, recording accumulated oil return time t2Judgment of tPreparation of-t2≤Δt1，tPreparation ofPresetting time length for oil return; if yes, go to step S103; if not, returning to the step S2; s103, detecting the running frequency f of the compressor1Simultaneously detecting and selecting an indoor unit M with the minimum capacity in operationminFor preparing the machine, the other internal machine valves are closed, and according to the internal machine MminTo the compressorAnd (5) line down-converting.
3. The control method for multi-split oil return noise reduction according to claim 2, further comprising S0, determining whether to accept a "cooling or dehumidifying mode" command by the multi-split air conditioner; if so, the process proceeds to step S1, otherwise, the operation is normal.
4. The control method for multi-split oil return noise reduction according to claim 1, wherein the step S2 includes: judgment of Tgl2+TTrimming 1＜Tgl1Or Tgl2If the temperature is less than 0 ℃, the step S3 is executed; if not, the operation is normal, wherein Tg11、Tg12Respectively representing the supercooling degrees of the multi-split air-conditioning unit before and after oil return.
5. The control method for multi-split oil return noise reduction according to any one of claims 1 to 4, further comprising: s4, judging whether the noise reduction control operation time length t is needed or not3＞Δt3Or Pd3＞PmaxOr Tgl3+TRepair 2＜Tgl1Or Tgl3If the temperature is less than 0 ℃, the noise reduction control is quitted; if not, return to S3, where Pd3For exhaust high pressure during noise reduction control, Tgl3Supercooling degree in noise reduction control, PmaxIs the high pressure upper limit set value of the multi-split air conditioner.
6. The control method for multi-split oil return noise reduction according to claim 5, wherein the step S4 includes: s41, judging whether t is3＞Δt3Or Pd3＞PmaxOr Tgl3+TRepair 2＜Tgl1Or Tgl3If the temperature is less than 0 ℃, performing step S42; if not, the process returns to S3. S42, judging whether the running time length t is long or not1＞Δt4If yes, exiting the noise reduction control according to the first mode; if not, the second mode exits the noise reduction control.
7. The control method for multi-split oil return noise reduction according to claim 6, wherein the first mode comprises: s421, adjusting the internal machine MminTo PMV0*K1Operating frequency of compressor to f1*K1And continuously running t4A duration; s422, closing electromagnetic valve SV of noise reduction device1Adjusting the internal machine MminTo PMV0*K2Operating frequency of compressor to f1*K2And continuously running t5The length of time.
8. The control method for multi-split oil return noise reduction according to claim 6, wherein the second mode comprises: s423, closing the electromagnetic valve SV of the noise reducer1Adjusting the internal machine MminTo PMV1*K3The compressor continues at frequency f2Operating and continuously operating t6A duration; s424, adjusting the internal machine MminTo PMV1*K4Adjusting the frequency of the compressor to f0And continuously running t6A duration; s425, adjusting the internal machine MminTo PMV1*K5Maintaining the frequency of the compressor at f0And continuously running t7The length of time.
9. A computer storage medium having a computer program stored thereon, wherein the computer program is executed to implement the control method for multi-split oil return noise reduction according to any one of claims 1 to 8.
10. A multi-split air conditioner comprising 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 control method for multi-split air conditioner oil return noise reduction according to any one of claims 1 to 8.
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