CN105605842A - Control method for multi-module set - Google Patents
Control method for multi-module set Download PDFInfo
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- CN105605842A CN105605842A CN201510998177.XA CN201510998177A CN105605842A CN 105605842 A CN105605842 A CN 105605842A CN 201510998177 A CN201510998177 A CN 201510998177A CN 105605842 A CN105605842 A CN 105605842A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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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
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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
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
- F24F3/065—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/027—Compressor control by controlling pressure
- F25B2600/0271—Compressor control by controlling pressure the discharge pressure
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a control method for a multi-module set. The multi-module set comprises multiple units. The control method comprises the steps that running parameters of all the units are detected and compared within a set period, wherein the running parameters of each unit include the number of faults of the unit and/or discharge pressure of a compressor, running time in a set region and running time of the compressor; when an instruction for changing indoor environment temperature is received, the running state of the unit with the optimal running parameters is controlled to change. According to the control method, after the units run for a long term, a running condition difference of the units, a whole machine performance difference and a compressor and important part difference are taken into comprehensive consideration, and the unit in the running state which needs to be changed is selected after the differences are taken into comprehensive consideration; in this way, even running of the units of a system can be maintained, and the units can run within an optical range for a long term; as a result, the service life of the multi-module set can be prolonged, and high-efficiency running of the whole system is guaranteed.
Description
Technical field
The present invention relates to refrigerating/heating equipment control field, especially relate to a kind of control method of multimode unit.
Background technology
Large Central Air Conditioning System air-cooled screw unit adopts modular designs mode, when many time in parallel, uses joint control logic,Can be according to user's request, automatically regulate each unit load, the joint control logic of optimization not only can balance unit load, prolongsLong unit durability, operation is optimum as far as possible more to make every unit, makes whole system reach more high energy efficiency. Letter in correlation techniqueSingle mode taking compressor operating time as reference, as the standard of unit balance movement, can not meet intellectualityThe demand of controlling.
Summary of the invention
The application is intended to solve one of technical problem existing in prior art. For this reason, the present invention aims to provide a kind of multimodeThe control method of piece unit, the method makes multimode unit entirety more balanced in the time of unit joint control.
According to the control method of the multimode unit of the embodiment of the present invention, described multimode unit comprises many units, eachDescribed unit includes connected compressor, condenser, evaporimeter and throttling arrangement to form the first refrigerant-cycle systems,The evaporimeter of described many units is suitable for being connected with indoor heat exchanger to form the second refrigerant circulatory system, described controlling partyMethod comprises the steps: in setting cycle, detect the operational factor of every unit and compare, each described unitOperational factor comprise the number of stoppages of described unit and/or the pressure at expulsion of described compressor running time of setting regions,The running time of described compressor; When receiving while changing the instruction of indoor environment temperature, described in controlling run parameter optimumThe running status of unit changes.
According to the control method of the multimode unit of the embodiment of the present invention, compress in setting cycle by many platform unitsThe running time of machine, simultaneously many platform units exist in the pressure at expulsion of setting cycle internal fault number of times and/or machine set compressorThe running time of setting regions, is equivalent to after the long-term operation of unit, considered many units operating condition difference,The difference of overall performance difference, compressor and important spare part, selects to need to change fortune again considering after above-mentioned differenceThe unit of row state, can the equilibrium operating of keeping system unit, and unit is operated in optimized scope for a long time, prolongs thereby be beneficial toLong multimode unit durability, ensures the high energy efficiency operation of entire system.
In certain embodiments, in the time comparing the operational factor of every unit in setting cycle, the operation of each described unitParameter comprises that the pressure at expulsion of the number of stoppages of described unit, described compressor is in running time and the described pressure of setting regionsThe running time of contracting machine.
Particularly, relatively comprising the steps: the same operation ginseng of many units of the operational factor of described many unitsNumber sorts from small to large; The sequence number of each operational factor of every unit is multiplied by the weighting system of corresponding operational factorNumber; Calculate the sequence number of multiple operational factors of every unit and the weight coefficient sum of products to draw weighted average; ManyThe size of pressing weighted average in platform unit is selected the unit of operational factor optimum.
In a specific embodiment, relatively the comprising the steps: many units of the operational factor of described many unitsAscending sequence running time of described compressor, the number that sorts the running time of each compressor is M, M isBe more than or equal to 1 integer; Sort ascending the number of stoppages of many units, the number of stoppages of every unitSequence number is P, and P is more than or equal to 1 integer; Fortune by the pressure at expulsion of the compressor of many units in setting regionsLine time is ascending to sort, and the pressure at expulsion of the compressor of every unit is in the sequence of the running time of setting regionsNumber is N, and N is more than or equal to 1 integer; The weighted average G=M ﹡ a+P ﹡ b+N of the operational factor of every unit﹡ c, wherein, the weight coefficient that a, b, c are corresponding operational factor, presses the size of weighted average and selects in many unitsThe unit of operational factor optimum.
Alternatively, the number of stoppages of described unit comprises: the operational factor of described compressor exceedes the number of times of secure threshold.
Alternatively, the number of stoppages of described unit comprises: the protection switch of described unit close number of times.
Alternatively, the number of stoppages of described unit comprises: the damage number of times of the checkout gear of described unit.
Alternatively, the throttling arrangement of each described unit comprises electric expansion valve, and the number of stoppages of described unit comprises: instituteState the number of stoppages of electric expansion valve.
In certain embodiments, in the time of many unit starts, many units are complied with according to weighted average order from small to largeInferior start.
In certain embodiments, in the time of many unit shutdown, many units are complied with according to weighted average order from big to smallInferior shutdown.
In certain embodiments, in the time receiving the increase refrigerating capacity of described multimode unit or the instruction of heating capacity, in fortuneIn unit in row, increase the load of the compressor of operational factor optimum; When receiving the refrigerating capacity that reduces described multimode unitOr when the instruction of heating capacity, in the unit being in operation, reduce the load of the compressor of operational factor optimum, and reducingAfter load, described compressor is still in running status.
In certain embodiments, in the time receiving the minimizing refrigerating capacity of described multimode unit or the instruction of heating capacity, in fortuneThe load that reduces the longest compressor of super scope time in unit in row, the described super scope time is institute in setting cycleState the pressure at expulsion of compressor in the running time of setting regions.
Additional aspect of the present invention and advantage in the following description part provide, and part will become from the following descriptionObviously, or by practice of the present invention recognize.
Brief description of the drawings
Above-mentioned and/or additional aspect of the present invention and advantage from conjunction with below accompanying drawing to becoming bright the description of embodimentAobvious and easy understanding, wherein:
Fig. 1 is according to the control method flow chart of the multimode unit of the embodiment of the present invention;
Fig. 2 is the system of selection flow process of the optimum unit of operational factor in multimode unit according to some embodiments of the inventionFigure;
Fig. 3 is the system of selection flow process of the optimum unit of operational factor in the multimode unit of other embodiment according to the present inventionFigure;
Fig. 4 is the system of selection stream of the optimum unit of operational factor in the multimode unit of a specific embodiment according to the present inventionCheng Tu;
Fig. 5 is multimode unit each unit operation parametric statistics chart in a week of a concrete example according to the present invention;
Fig. 6 is that the example shown in Fig. 5 is calculated according to the unit operation parameter optimal selection method of one embodiment of the inventionResult chart;
Fig. 7 is the regulating cycle control key diagram of the multimode unit of a concrete example according to the present invention.
Detailed description of the invention
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, wherein phase from start to finishSame or similar label represents same or similar element or has the element of identical or similar functions. Attached below by referenceThe embodiment that figure describes is exemplary, is intended to for explaining the present invention, and can not be interpreted as limitation of the present invention.
In addition, term " first ", " second " be only for describing object, and can not be interpreted as instruction or hint relative importanceOr the implicit quantity that indicates indicated technical characterictic. Thus, the feature that is limited with " first ", " second " can be expressedOr impliedly comprise one or more these features. In description of the invention, except as otherwise noted, " multiples' "Implication is two or more.
In description of the invention, unless otherwise clearly defined and limited, term " is connected ", " connection ", " fixing "Should be interpreted broadly, for example, can be to be fixedly connected with, and can be also to removably connect, or integral; Can be machineryConnecting, can be also electrical connection; Can be to be directly connected, also can indirectly be connected by intermediary, can be twoThe interaction relationship of the connection of element internal or two elements. For the ordinary skill in the art, can toolBody situation is understood above-mentioned term concrete meaning in the present invention.
Describe according to the control method of the multimode unit of the embodiment of the present invention below with reference to Fig. 1-Fig. 7.
Multimode unit comprises many units, and every unit includes connected compressor, condenser, evaporimeter and throttlingDevice waits to form the first refrigerant-cycle systems, and the evaporimeter of many units is suitable for being connected to form with indoor heat exchanger theTwo refrigerant-cycle systems.
In embodiments of the present invention, many units can be respectively single cooler group, and many units also can be respectively source pump.In the time that many units are source pump, every unit also comprises commutation assembly, and commutation assembly can be cross valve etc., commutationFor the exhaust outlet of controlling compressor, a 's assembly with condenser and evaporimeter is connected, and control condenser and evaporationAnother in device is connected with the gas returning port of compressor. Here, compressor, condenser, evaporimeter, throttling arrangement, changeBe that prior art is known to the operation principle of the concrete structure of assembly and single cooler group, source pump etc., therefore thisIn literary composition, no longer describe in detail.
Wherein, in the first refrigerant-cycle systems of compressor, condenser, evaporimeter and throttling arrangement composition, firstCold-producing medium can be ammonia, fluorine Lyons or hydrocarbon refrigerant, and the particular type of the first cold-producing medium is not construed as limiting.
In embodiments of the present invention, evaporimeter is chosen as shell and tube evaporator, is provided with heat exchanger tube, shell in the housing of evaporimeterOne of them of fluid chamber and heat exchanger tube is for first cold-producing medium that circulates, and another in housing cavity and heat exchanger tube is for streamLogical second refrigerant. Evaporimeter is connected in series in the first refrigerant-cycle systems for the part of first cold-producing medium that circulates,Evaporimeter is connected in series in the second refrigerant circulatory system for the part of the second refrigerant that circulates. Here, evaporimeter alsoCan be other types heat exchanger, as long as the first cold-producing medium and second refrigerant can carry out heat exchange in evaporimeter, hereDo not do concrete restriction.
By the heat exchange of the first cold-producing medium and second refrigerant in evaporimeter, can be by the first refrigerant circulation in single cooler groupThe cold quantity transmission that system produces is to indoor heat exchanger, and what in source pump, the first refrigerant-cycle systems can be produced is coldAmount or heat are transferred in indoor heat exchanger.
Preferably, second refrigerant is water, and certainly, second refrigerant also can be disclosed other types system in prior artCryogen, does not do concrete restriction here.
For convenience of description, all describe taking second refrigerant as water hereinafter. In the time that second refrigerant is water, steamThe second refrigerant circulatory system forming between hair device and indoor heat exchanger also can be referred to as water circulation system.
In embodiments of the present invention, the evaporimeter of many units is connected in water circulation system, in this water circulation system, can establishThere is one or more indoor heat exchanger. The cold needing when indoor heat exchanger or when thermal change, can appoint by controlThe running status of a unit, changes the cold or the heat that are passed to indoor heat exchanger.
Here,, for increasing or reduce the cold or the heat that are passed to water circulation system, the running status of unit changes to be hadVarious ways. For example, in the time that the compressor of every unit is frequency-changeable compressor, can change by the frequency that changes compressorThe refrigerating capacity of variable compression machine or heating capacity; Or when the aperture of throttling arrangement can timing, can be by changing throttling arrangementAperture changes the first refrigerant flow, thereby changes the cold or the heat that are finally passed to water circulation system; Or work asWhen condenser is air-cooled heat exchanger, can change by changing the ventilation of condenser the degree of supercooling of the first cold-producing medium, fromAnd change is finally passed to cold or the heat of water circulation system.
The running status of a unit of needs of therefore mentioning hereinafter changes, can carry out above-mentioned arbitrary measure orMultiple operations, change this unit and are finally passed to cold or the heat of water circulation system, reach multimode unit finalBe passed to the cold of indoor heat exchanger or the object of thermal change. Certainly, in the embodiment of the present invention, single unit also can be adoptedWith disclosed other measures of prior art, change this unit and be finally passed to cold or the heat of water circulation system, thisIn do not do concrete restriction.
Certainly, in a unit, if need to change this unit and be finally passed to cold or the heat of water circulation system,Mainly still to, by changing the compressor load of this unit, change refrigerating capacity or the heating capacity of this unit. Therefore existIn following description, the measure changing taking compressor load adjustment as operating states of the units describes as example, underWen Zhong, mentions when operating states of the units changes, and mainly refers to the adjustment of compressor load.
In addition, in the time of the cold needing in water circulation system or heat increase, can be by increasing the machine of any one startThe load of group compressor, or restart a unit. When water circulation system need cold or heat reduce time,Can pass through the load of the machine set compressor that reduces any start, or close a unit and realize.
And the running status of which platform unit of selection change in many units needs to design a kind of optimal control of equilibrium operatingMethod, with in conjunction with the long-term ruuning situation of unit, regulates unit load, and in guarantee multimode unit, each unit is equalWeighing apparatus operation.
According to the control method of the multimode unit of the embodiment of the present invention, as shown in Figure 1, comprise the steps:
S1: detect the operational factor of every unit and compare in setting cycle, the operational factor of every unit comprisesThe number of stoppages of unit and/or the pressure at expulsion of compressor are in the running time of setting regions, the running time of compressor;
S2: in the time receiving the instruction that changes indoor environment temperature, the running status of the unit of controlling run parameter optimum occursChange.
That is to say, in embodiments of the present invention, in the time that multimode unit receives the instruction that changes indoor environment temperature,Multimode unit is selected the unit of parameter optimum after relatively through above-mentioned parameter, then this unit is carried out to running status changeOperation, make multimode unit produce cold or heat can meet consumers' demand.
In the time that many units compare, need operational factor relatively to comprise the running time of setting cycle inner compressor.This is because compressor is the critical component of unit, and be the key of a unit durability length of restriction the service life of compressorParameter, the efficiency of compressor is also the key factor that affects unit efficiency. Therefore in the time of many platform units, first to examineWhat consider is the compressor of every unit running time in setting cycle.
In addition, in the time that many units compare, also need the operational factor of comparison to comprise: the number of stoppages of unit, pressureAt least one in the running time of setting regions of the pressure at expulsion of contracting machine for convenience of describing, compressed in setting cycleThe pressure at expulsion of machine in running time of setting regions referred to as the super scope time. That is to say, relatively time, can compareThe number of stoppages of unit, also can relatively super scope time length, or also can be by the number of stoppages of unit, super scope timeAll compare.
Like this, by cumulative the running time of the compressor of unit operation, that the number of stoppages is cumulative, the super scope time adds up etc. is manyAfter planting the combined factors of evaluating unit operation situation, obtain final sequence, start shooting, shut down and add and unload as system moduleCarry foundation successively.
If unit breaks down, or the pressure at expulsion of compressor is in setting regions, shows that this unit may occurAbnormal, the optimized operation scope deviation to some extent of unit. And in the time that needs change operating states of the units, select the number of stoppagesFew unit, or the more healthy unit of compressor operating, can reduce the maintenance rate of multimode unit, uses thisIt is comprehensively balanced that mode can make system module realize. And owing to selecting more healthy unit operation, can ensure unit fortuneThe reliability of row, in the time that user sends operational order, multimode unit can be finished the work fast and efficiently so, fromAnd raising user satisfaction.
According to the control method of the multimode unit of the embodiment of the present invention, compress in setting cycle by many platform unitsThe running time of machine, simultaneously many platform units exist in the pressure at expulsion of setting cycle internal fault number of times and/or machine set compressorThe running time of setting regions, is equivalent to after the long-term operation of unit, considered many units operating condition difference,The difference of overall performance difference, compressor and important spare part, selects to need to change fortune again considering after above-mentioned differenceThe unit of row state, can the equilibrium operating of keeping system unit, and unit is operated in optimized scope for a long time, prolongs thereby be beneficial toLong multimode unit durability, ensures the high energy efficiency operation of entire system.
In embodiments of the present invention, refer to the running time of compressor setting cycle inner compressor each running time itWith. The pressure at expulsion of compressor referred in the running time of setting regions, at setting cycle inner compressor with pressure at expulsionIn setting regions each time running time sum. The number of stoppages of unit refers to, the each parts of unit in setting cycleThe cumulative frequency breaking down.
In unit, can be provided with monitoring system, to monitor the status information of the each parts of unit, when the monitoring system of unit is receivedWhen the status information of each parts feedback, collection status information is also made fault diagnosis, is recorded in the compression of unit in setting cycleMachine running time is cumulative, compressor is cumulative with the running time of the pressure exhaust of setting regions, the number of stoppages is cumulative etc.
Wherein, in embodiments of the present invention, the number of stoppages of unit is included in the each parts of unit in setting cycle and breaks downCumulative frequency. In actual practicality, can judge which fault is the present invention according to unit practical structures and application conditionsThe fault that the control method of embodiment need to record.
For example, the fault type that whole work system may occur comprises power failure, pressure fault, water temperature fault, waterAmount fault and structural failure fault etc. Wherein, in unit, power failure, pressure fault etc. can affect single unit fortuneOK, can affect the performance quality of single unit, this class fault by be accumulated in the embodiment of the present invention control method unit thereforeIn barrier number of times. And water temperature fault, water yield fault etc. in water circulation system, the operation that this class fault will all units of impact,Instead of the performance of single unit is impacted, this class fault will not be accumulated in the machine of control method of the embodiment of the present inventionIn the group number of stoppages. Set structure damages fault as shell breakage etc., little to the circulating effect of this unit the first cold-producing medium,And cannot detect by sensor supervising device, therefore this class fault is not accumulated in the controlling party of the embodiment of the present invention yetIn the unit number of stoppages of method.
In the time recording the number of stoppages of unit, its running status of the parts of record can be passed to monitoring system by automatically controlled mode,Or can detection information be passed to monitoring system by other detection of electrons devices. In the fault message obtaining, only willThe fault that affects the first refrigerant-cycle systems overall performance of unit is accumulated in the number of stoppages of record.
Wherein, at judging part, whether when fault, most of decision method enters with operational factor and the secure threshold of these partsAfter row, draw.
It should be noted that, in unit, each workpiece and detection part are typically provided with secure threshold. Secure threshold can beProducer is the operational factor numerical value of each component settings in advance. In actual applications, those skilled in the art can select flexibly,Disclosure embodiment is not construed as limiting this.
Taking compressor as example, the partial properties index of compressor has nominal parameter, in the time of monitoring, can preset pressureWhether the secure threshold of contracting machine, reach dangerous situation in order to the operation of indicating compressor. In the time that compressor normally moves, pressThe operational factor of contracting machine is no more than the nominal parameter of compressor. In the time that the operational factor of compressor exceedes secure threshold, showBright compressor operating exceedes its load-bearing capacity or compressor occurs compared with major break down, therefore when monitoring system is received compressorWhen operational factor exceedes the information of secure threshold, can judge that primary fault appears in unit.
Be understandable that, because compressor is the critical component of unit, the operational factor of compressor can be reacted compressorThe running status of an even whole unit, therefore in certain embodiments, the number of stoppages of unit can comprise: the fortune of compressorLine parameter exceedes the number of times of secure threshold.
Particularly, in actual applications the compressor operation parameters of system monitoring have multiple, reaction compressor behaviorMain operational factor can comprise pressure at expulsion, the pressure of inspiration(Pi) of compressor, the delivery temperature of compressor, the compression of compressorOil level in machine etc. In the time that monitoring system receives that the above-mentioned operational factor of compressor exceedes the information of corresponding secure threshold,Can judge that unit breaks down, this fault is accumulated in record in the number of stoppages of the inventive method.
Taking the pressure at expulsion of compressor as example, in the time that compressor normally moves, the pressure at expulsion of compressor is not more than specified rowAtmospheric pressure. If when the pressure at expulsion of compressor exceedes rated discharge pressure, compressor may occur extremely, and works asWhen the pressure at expulsion of compressor exceedes the secure threshold of pressure at expulsion, may there is larger fault in compressor. ThereforeIn the time that the pressure at expulsion of compressor is greater than the secure threshold of this pressure, monitoring system judges that this compressor breaks down, nowThis fault is accumulated in the unit number of stoppages.
In certain embodiments, the throttling arrangement of every unit comprises electric expansion valve, and the number of stoppages of unit also comprises:The number of stoppages of electric expansion valve. Throttling arrangement can directly affect flow and heat exchange efficiency, the therefore throttling of the first cold-producing mediumThe failure factor of device is the another factor of considering unit overall performance. Wherein, because electric expansion valve can pass through automatically controlled sideFormula is connected with monitoring system, and therefore the number of stoppages of electric expansion valve can directly be reflected in monitoring system, and monitoring is convenient straightConnect.
In addition, in certain embodiments, unit is provided with protection switch at different parts place, in the time that these parts normally moveThis protection switch is opened, and in the time that the operational factor of these parts exceeds secure threshold, corresponding protection switch is closed, like this,Monitoring system can be by the on off state of protection switch, directly knows whether fault of these parts. Therefore, the fault of unit timeNumber can comprise: the protection switch of unit close number of times.
Alternatively, the protection switch of unit comprises: compressor air-discharging end high voltage protective switch, compressor air suction end low pressure are protectedProtect switch, overload of compressor protection switch, compressor oil bit switch etc., protection switch also can comprise other types in unitProtection switch, do not do concrete restriction here.
Wherein, compressor air-discharging end high voltage protective switch is located at the exhaust end of compressor, establishes when Compressor Discharge Pressure exceedesWhen fixed high-voltage value, compressor air-discharging end high voltage protective switch cuts out. Compressor air suction end low-voltage protective switch is located at compressionThe suction end of machine, when the pressure of inspiration(Pi) of compressor lower than set low voltage value time, compressor air suction end low-voltage protective switch closesClose. Whether overload of compressor protection switch transships for detection of the electric current of compressor, to avoid wire overheated and damage. WhenWhen the three-phase current of compressor power exceedes safe current, overload of compressor protection switch is closed. Compressor oil bit switch is usedIn detecting lubricant in compressor oil level, in the time that oil level is too low, compressor oil bit switch can be closed.
In certain embodiments, the number of stoppages of unit comprises: the damage number of times of the checkout gear of unit, here, ifHaving there is damage in the checkout gear of certain parts, is very likely that extremely, therefore existing appears in these parts that checkout gear detectsWhen the statistics number of stoppages, also need to consider the damage number of times of checkout gear.
Alternatively, the checkout gear of unit comprises: compressor air suction end low pressure detecting sensor, compressor air-discharging end high pressureDetecting sensor, compressor air-discharging end temperature detection sensor etc., checkout gear also can comprise the detection of unit other typesSensor, does not do concrete restriction here. Wherein, compressor air suction end low pressure detecting sensor is for detection of compressorPressure of inspiration(Pi), compressor air-discharging end high pressure detecting sensor is for detection of the pressure at expulsion of compressor, compressor air-discharging end temperatureDegree detecting sensor is for detection of the delivery temperature of compressor.
Here,, if same parts break down, many places detection means may detect simultaneously. For example, work as compressorPressure at expulsion while exceeding secure threshold, compressor air-discharging end temperature detection sensor is judged compressor fault by detection,Compressor air-discharging end high voltage protective switch cuts out because pressure at expulsion is too high simultaneously, while now recording unit fault, can add up oneInferior, also can add up twice. That is to say, when same fault is detected by different detection means, this failure logging is for onceFault, also can be cumulative according to actual conditions.
Certainly, in the embodiment of the present invention, the fault of statistics is not limited to the fault of compressor, throttling arrangement, also can add up itHis parts, as each solenoid valve failure in the blower fan overload fault of condenser, unit etc., are not done concrete restriction here.
In addition, in embodiments of the present invention, the setting regions of the pressure at expulsion of compressor can refer to: the exhaust of compressorPressure is greater than rated discharge pressure, and the pressure at expulsion of compressor is less than the secure threshold of pressure at expulsion. That is to say, pressThe pressure at expulsion of contracting machine referred in the running time of setting regions, the accumulated time that compressor moves under abnormality.
After the operational factor of each unit in setting cycle has been recorded, can be according to specific algorithm comparison, to obtainThe unit of parameter optimum.
In embodiments of the present invention, the control method of employing is for taking setting cycle inner compressor running time as principal element,Considering number of times and the super scope of operation that in setting cycle, unit breaks down (is that the pressure at expulsion of compressor is in setting districtIn territory) time.
The comparative approach for example adopting is, in the situation that compressor operating time approaches, to pay the utmost attention to the unit that fault is few.In the situation that the number of stoppages approaches, pay the utmost attention to the super shorter unit of scope time of operation. Certainly, comparison algorithm is concreteHave multiplely, be not construed as limiting here.
As in certain embodiments, in the time selecting the unit of parameter optimum, the operational factor of reference is included in setting cycleThe running time of compressor, the number of stoppages of unit, the super scope of compressor running time, multimode unit comprises i platformUnit, i is more than or equal to 2 integer. As shown in Figure 2, the comparative approach of the operational factor of many units comprises as followsStep:
D1: the i1 platform unit that obtains the running time minimum (or the longest) of compressor in many units;
D2: the i2 platform unit that obtains the number of stoppages minimum (or at most) of unit in the selection result of step D1;
D3: the pressure at expulsion of obtaining compressor in the selection result of step D2 the running time of setting regions the shortest (orPerson is the longest) unit.
Wherein, i1 and i2 can be selected according to actual conditions.
Taking the multimode machine set system of four units composition shown in Fig. 5 as example, i1=3, i2=2. Through said methodStep D1 can obtain, within the cycle in a week, and the compressor of First unit, second unit, the 3rd unitRunning time is the shortest; Can obtain at the step D2 through said method, within the cycle in a week, First unit,The unit number of stoppages of three units is minimum; Known at the step D3 through said method, within the cycle in a week,The super scope of machine set compressor accumulative total running time of the 3rd unit is the shortest. Therefore through said method relatively after, work as multimodeWhen unit receives the instruction that changes indoor environment temperature, the running status of controlling the 3rd unit changes.
In other embodiment of the present invention, adopt the weighting algorithm of each operational factor, the weighting that calculates each unit is flatAfter average, judge unit quality with weighted average size.
Wherein, before making weighted sum, the transfer algorithm of each operational factor of unit is not done concrete restriction. For example, withThe number of permutations of many a certain operational factors of unit is as average weighted radix.
Particularly, as shown in Figure 3, the comparative approach of the operational factor of many units comprises the steps:
E1: the same operational factor of many units is sorted from small to large;
E2: the sequence number of each operational factor of every unit is multiplied by the weight coefficient of corresponding operational factor;
E3: calculate the sequence number of multiple operational factors of every unit and the weight coefficient sum of products to draw weighted averageValue;
The size of pressing weighted average in many units is selected the unit of operational factor optimum.
In these computational methods, the operational factor of consideration comprises the running time of compressor, and the operational factor of consideration also comprises:The number of stoppages of unit and at least one in the running time of setting regions of the pressure at expulsion of compressor.
Comprise that with the operational factor of unit the pressure at expulsion of the number of stoppages, (2) compressor of (1) unit setting belowThe running time in region, the running time of (3) compressor, as Consideration, are calculated the unit of operational factor optimumSystem of selection.
Particularly, as shown in Figure 4, relatively the comprising the steps: of the operational factor of many units
E1: sort ascending the running time of the compressor of many units, row's running time of each compressorOrdinal number is M, and M is more than or equal to 1 integer;
E2: sort ascending the number of stoppages of many units, the sequence number of the number of stoppages of every unit is P,P is more than or equal to 1 integer;
E3: the pressure at expulsion of the compressor of many units is the ascending sequence running time of setting regions, everyThe pressure at expulsion of the compressor of platform unit is N at the sequence number of the running time of setting regions, N be more than or equal to 1 wholeNumber;
E4: the weighted average G=M ﹡ a+P ﹡ b+N ﹡ c of the operational factor of every unit, wherein, a, b, c are phaseAnswer the weight coefficient of operational factor, the size of pressing weighted average G in many units is selected the unit of operational factor optimum.
That is to say, before multiplying each other do weighting, by the corresponding operation of the corresponding operational factor of every unit and other unitsParameter is carried out sequence from small to large, the radix using clooating sequence as weighted calculation.
Taking the statistics shown in Fig. 5 as example, add up to sort one week interior running time by compressor, second unitCompressor operating time is the shortest, is the 3rd unit, First unit and the 4th unit afterwards successively, therefore by compressionIn machine one week, accumulated running time sorts and is followed successively by from small to large: second unit, the 3rd unit, First unit andThe 4th unit. The processing method of running time in compressor using sort method as many units one week, the row who obtainsSequence number is the calculating basis of weighting.
In like manner, sort by one week number of stoppages accumulative total of unit, fault cumulative number sorts and is followed successively by from small to large: theThree units, the 4th unit, First unit, second unit. Fault using sort method as many units timeThe processing method of number, the sequence obtaining number is the calculating basis of weighting.
In like manner, sort in setting regions accumulated running time by one week interior pressure at expulsion of compressor, the cumulative time is from littleBe followed successively by large sequence: the 3rd unit, the 4th unit, second unit, First unit. Do with sort methodFor the compressor of many units processing method of super scope operation cumulative time, the calculating base that the sequence obtaining number is weightingNumber.
As shown in Figure 6, in this embodiment, the weight of one week interior accumulated running time of compressor is 40%, unit one weekThe weight of the accumulative total number of stoppages is 30%, and one week interior pressure at expulsion of compressor in the weight of setting regions accumulated running time is30%. Each operational factor sequence number of every unit is multiplied by the weight coefficient of relevant parameter, and by the institute of every unitHave weighted product summation, obtain the weighted average of this unit, in many units, the unit of weighted average minimum isThe 3rd unit, the unit of weighted average maximum is First unit. In the time that multimode unit need to load, the 3rdUnit can be optimum unit, and in the time that multimode unit need to unload, First unit can be optimum unit. That is to say,Under different operating conditions, the choice criteria difference of optimum unit.
In certain embodiments, the selection that multimode unit carries out an operational factor optimum at interval of computing cycle is calculated,Obtain the unit of operational factor optimum, if receive so the instruction that changes indoor environment temperature in this computing cycle,The optimum unit calculating in this computing cycle is operated, as increase compressor load of this unit etc.
Wherein, in the embodiment of the present invention, the time of setting cycle, computing cycle is not done concrete restriction, for example, and in Fig. 5 instituteIn the example of showing, the setting cycle of accumulated running time, the number of stoppages is one week, and setting cycle is 168 hours.And in this example, at interval of the once weighted average of the operational factor of each unit, i.e. computing cycle of calculating in 10 minutesIt is 10 minutes.
In specific embodiment of the present invention, in the time of the start of many units, preferential uncapping machine set condition is: in start etc.Under the prerequisite of treat, condition such as oil heating etc. is satisfied, will after each key factor weighted average, obtain power-up sequence, according to startOrder is opened from small to large. Be that many units are started shooting successively according to weighted average order from small to large. Like this, by propertyCan preferably start shooting by best unit, cold or heat that unit is produced can be passed to user fast, reposefully, fromAnd system can rapidly and efficiently respond user's request.
In the time of many unit shutdown, many units shut down successively according to weighted average order from big to small.
In some specific embodiments, in the time receiving the refrigerating capacity of increase multimode unit or the instruction of heating capacity, in fortuneIn unit in row, increase the load of the compressor of operational factor optimum. That is to say, in the situation that can meet burden requirementUnder, the start group of trying one's best few. In other words, in the time receiving the refrigerating capacity of increase multimode unit or the instruction of heating capacity,If can be in the unit in running status, just can increase multimode unit by the mode of loading unit load needsThe refrigerating capacity of wanting or heating capacity, so without again separately opening a unit. When the unit of all starts is all loaded on fullWhen load, if also do not reach refrigerating capacity or the heating capacity that multimode unit needs, then at the unit in off-modeThe unit start of middle selection operational factor optimum.
In the time receiving the refrigerating capacity of minimizing multimode unit or the instruction of heating capacity, in the unit being in operation, reduce operationThe load of the compressor of parameter optimum, and reducing the rear compressor of load still in running status. That is to say, can expireIn the situation of foot burden requirement, can not shut down and not shut down as far as possible. Reduce the refrigerating capacity of multimode unit or heat when receivingWhen the instruction of amount, and reduction is when larger, can control two or two above units off-loads respectively, avoids a certainThe load off-load of unit is to shutdown.
In other specific embodiments, in the time receiving the refrigerating capacity of minimizing multimode unit or the instruction of heating capacity,The load that reduces the longest compressor of super scope time in operating unit, the super scope time for to compress in setting cycleThe pressure at expulsion of machine is in the running time of setting regions. Like this, unload or limit for tonnage for the unit of super scope operation,Can ensure that unit operation is at optimum range.
In certain embodiments, multimode unit under the satisfied prerequisite of booting wait, condition such as oil heating etc., first open portionDivide the little some units of weighted average, then increase gradually the load of some units of start, if these some units addWhile being loaded onto fullcharging, do not meet yet user's cold or heat requirement, the more other unit of starting shooting. That is to say operation formerTo gradually become load operating unit by the mode of the increase operating unit starting.
In addition, in certain embodiments, in the time that many units are successively started shooting, can be loaded at the little unit of weighted averageAfter fully loaded, the unit that weighted average is large is started shooting again.
For example, after total return water temperature is lower than turn-on temperature, multimode unit is loading section unit only, if all unlatchingsUnit all fully loaded after, then open other unit, to increase operating unit. Here, total return water temperature refers to water circulationThe return water temperature that is flowed to evaporimeter in system by indoor heat exchanger, turn-on temperature refers to initial water temperature.
Below with reference to Fig. 7, the control method of describing multimode unit in a concrete example is described.
After multimode unit is opened, initialization system, then recognition system configuration, read module information, reads eachThe monitoring information of the feedback of parts. According to monitoring information, carry out integrated ordered to unit situation.
When system is sent after instruction, monitoring system judges that according to load multimode unit is to need to load or need unloading.
If when judged result does not need to unload for neither needing to load yet, system is failure to actuate;
If judged result, for needs load, can, by the unit in sequence load operating, also can reopen a unit,If newly open a unit, in standby unit, open the preferential unit of sequence;
If judged result is needs unloading, can, by the operating unit of sequence unloading, also can close down a unit, asFruit is closed down a unit, in the unit of operation, closes down the preferential unit of sequence.
In the description of this description, reference term " embodiment ", " some embodiment ", " example ", " concrete example "Or the description of " some examples " etc. means specific features, structure, material or the feature described in conjunction with this embodiment or exampleBe contained at least one embodiment of the present invention or example. In this manual, to the schematic statement of above-mentioned term notNecessarily refer to identical embodiment or example. And specific features, structure, material or the feature of description can beIn any one or more embodiment or example with suitable mode combination.
Although illustrated and described embodiments of the invention, those having ordinary skill in the art will appreciate that: not de-In the situation of principle of the present invention and aim, can carry out multiple variation, amendment, replacement and modification to these embodiment,Scope of the present invention is limited by claim and equivalent thereof.
Claims (12)
1. a control method for multimode unit, is characterized in that, described multimode unit comprises many units, eachDescribed unit includes connected compressor, condenser, evaporimeter and throttling arrangement to form the first refrigerant-cycle systems,The evaporimeter of described many units is suitable for being connected with indoor heat exchanger to form the second refrigerant circulatory system,
Described control method comprises the steps:
In setting cycle, detect the operational factor of every unit and compare, the operational factor of each described unit comprisesThe number of stoppages of described unit and/or the pressure at expulsion of described compressor are at the running time of setting regions, described compressorRunning time;
In the time receiving the instruction that changes indoor environment temperature, the running status of the described unit of controlling run parameter optimum occursChange.
2. the control method of multimode unit according to claim 1, is characterized in that, in comparison setting cycleWhen the operational factor of every unit, the operational factor of each described unit comprises the number of stoppages of described unit, described compressionThe pressure at expulsion of machine is in the running time of setting regions and the running time of described compressor.
3. the control method of multimode unit according to claim 1, is characterized in that, the fortune of described many unitsRelatively comprising the steps: of line parameter
The same operational factor of many units is sorted from small to large;
The sequence number of each operational factor of every unit is multiplied by the weight coefficient of corresponding operational factor;
Calculate the sequence number of multiple operational factors of every unit and the weight coefficient sum of products to draw weighted average;
The size of pressing weighted average in many units is selected the unit of operational factor optimum.
4. the control method of multimode unit according to claim 2, is characterized in that, the fortune of described many unitsRelatively comprising the steps: of line parameter
Sort ascending the running time of the described compressor of many units, row's running time of each compressorOrdinal number is M, and M is more than or equal to 1 integer;
Sort ascending the number of stoppages of many units, the sequence number of the number of stoppages of every unit is P, PFor being more than or equal to 1 integer;
By the pressure at expulsion of the compressor of many units at the ascending sequence running time of setting regions, every machineThe pressure at expulsion of the compressor of group is N at the sequence number of the running time of setting regions, and N is more than or equal to 1 integer;
The weighted average G=M ﹡ a+P ﹡ b+N ﹡ c of the operational factor of every unit, wherein, a, b, c are for meeting the tendency mutuallyThe weight coefficient of line parameter, the size of pressing weighted average in many units is selected the unit of operational factor optimum.
5. the control method of multimode unit according to claim 1, is characterized in that, the fault of described unit timeNumber comprises: the operational factor of described compressor exceedes the number of times of secure threshold.
6. the control method of multimode unit according to claim 1, is characterized in that, the fault of described unit timeNumber comprises: the protection switch of described unit close number of times.
7. the control method of multimode unit according to claim 1, is characterized in that, the fault of described unit timeNumber comprises: the damage number of times of the checkout gear of described unit.
8. the control method of multimode unit according to claim 1, is characterized in that, the joint of each described unitStream device comprises electric expansion valve, and the number of stoppages of described unit comprises: the number of stoppages of described electric expansion valve.
9. the control method of multimode unit according to claim 3, is characterized in that, in the time of many unit starts,Many units are started shooting successively according to weighted average order from small to large.
10. the control method of multimode unit according to claim 3, is characterized in that, many unit shutdownTime, many units shut down successively according to weighted average order from big to small.
The control method of 11. multimode units according to claim 1, is characterized in that, described in reception increaseWhen the refrigerating capacity of multimode unit or the instruction of heating capacity, in the unit being in operation, increase the compression of operational factor optimumThe load of machine;
In the time receiving the minimizing refrigerating capacity of described multimode unit or the instruction of heating capacity, in the unit being in operation, reduceThe load of the compressor of operational factor optimum, and reducing the rear described compressor of load still in running status.
The control method of 12. multimode units according to claim 1, is characterized in that, described in reception minimizingWhen the refrigerating capacity of multimode unit or the instruction of heating capacity, in the unit being in operation, reduce super the longest pressure of scope timeThe load of contracting machine, the described super scope time is that the pressure at expulsion of described compressor in setting cycle is in the operation of setting regionsTime.
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| CN114413456A (en) * | 2022-01-14 | 2022-04-29 | 埃能科技(广州)有限公司 | Group control method and equipment for chilled water system of central air conditioner |
| CN114413456B (en) * | 2022-01-14 | 2023-09-08 | 埃能科技(广州)有限公司 | Group control method and equipment for chilled water system of central air conditioner |
| CN114923266A (en) * | 2022-07-20 | 2022-08-19 | 蘑菇物联技术（深圳）有限公司 | Method, apparatus and medium for controlling chiller of central air conditioning system |
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