CN107218705B - Control method of outdoor motor, air conditioner and storage medium - Google Patents
Control method of outdoor motor, air conditioner and storage medium Download PDFInfo
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- CN107218705B CN107218705B CN201710493400.4A CN201710493400A CN107218705B CN 107218705 B CN107218705 B CN 107218705B CN 201710493400 A CN201710493400 A CN 201710493400A CN 107218705 B CN107218705 B CN 107218705B
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Abstract
The invention discloses a control method of an outdoor motor, an air conditioner and a storage medium, wherein the control method can be used for carrying out variable speed control on a motor of an outdoor fan of a machine room air conditioner.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method of an outdoor motor, an air conditioner and a storage medium.
Background
The air conditioner in the machine room operates all the year round, in the process of refrigerating operation, the refrigerating system controls the rotating speed of an outdoor motor according to the condensing pressure, and the condensing pressure and the rotating speed of the motor are in a direct proportion relation. After the devices in the machine room work for a period of time, the devices usually generate heat, so that the indoor environment temperature rises, and the evaporation pressure of the refrigeration system rises accordingly. Particularly, when the outdoor environment temperature is low, the exhaust pressure of the refrigeration system is too low, and then the condition that the operation compression ratio of the compressor does not meet the safe operation range occurs, so that the operation reliability and the service life of the compressor are influenced.
Disclosure of Invention
The invention mainly aims to provide a control method of an outdoor motor, aiming at improving the operation reliability of a compressor and prolonging the service life of the compressor.
In order to achieve the above object, the present invention provides a method for controlling an outdoor motor, comprising the steps of:
monitoring the condensing pressure P of a refrigeration system after the compressor has been startedc；
When P is presentc＞PonWhen the motor is started, the outdoor motor is controlled to be started;
monitoring the evaporating pressure P of the refrigerating system after the outdoor motor runs for a preset timee；
Acquiring the evaporation pressure P according to the preset operation range of the compressoreCorresponding minimum exhaust pressure value Ps；
According to the obtained condensing pressure PcAnd a minimum exhaust pressure value PsAdjusting the rotating speed V of the outdoor motor in real time;
wherein, PonIs the condensation pressure value when the outdoor motor is started.
Further, after the compressor is started, the condensing pressure P of the refrigerating system is monitoredcThe method specifically comprises the following steps:
after the compressor is started, the condensing pressure P of the refrigerating system is read by a first pressure sensor arranged on the condenserc(ii) a Or the like, or, alternatively,
after the compressor is started, the condensation temperature of the refrigeration system is read through a first temperature sensor arranged on the condenser, and then the condensation pressure P of the refrigeration system is determined according to the relation between the predetermined condensation temperature and the predetermined condensation pressurec。
Further, after the outdoor motor runs for a preset time, the evaporation pressure P of the refrigerating system is monitoredeThe method specifically comprises the following steps:
after the outdoor motor runs for a preset time, reading the evaporation pressure P of the refrigeration system through a second pressure sensor arranged on the evaporatore(ii) a Or the like, or, alternatively,
after the outdoor motor runs for a preset time, the refrigeration is read through a second temperature sensor arranged on the evaporatorThe evaporating temperature of the system, and then the evaporating pressure P of the refrigerating system is determined according to the relationship between the evaporating temperature and the evaporating pressure which are determined in advancee。
Further, the condensation pressure P is obtained according to the obtainedcAnd a minimum exhaust pressure value PsAnd adjusting the rotating speed V of the outdoor motor in real time, wherein the step comprises the following steps of:
when P is presenton＜Pc≤PmaxWhen the outdoor motor runs at the rotating speed V, the rotating speed V is equal to Vmin+((Pc－Ps－Y)/X)×(Vmax－Vmin)；
Wherein, Pon＝(Ps+Y)bar，Pc＞PsX is a pressure ratio band, Y is an adjustable deviation, VminIs the minimum rotational speed, V, of the outdoor motormaxIs the maximum speed of the outdoor motor, PmaxIs the maximum condensing pressure value of the compressor operation range.
Further, the pressure proportional band X is 5 ± n1The adjustable deviation Y is 1 +/-n2(ii) a Wherein n is1≤5，n2≤1。
Further, the condensation pressure P is obtained according to the obtainedcAnd a minimum exhaust pressure value PsAnd adjusting the rotating speed V of the outdoor motor in real time, further comprising:
when P is presentc＜PoffWhen the outdoor motor is started, the outdoor motor is controlled to stop;
when P is presentoff≤Pc≤PonWhile controlling the outdoor motor to rotate at a minimum speed VminRunning;
when P is presentc＞PmaxWhile controlling the outdoor motor to rotate at the maximum rotating speed VmaxRunning;
wherein, PoffIs the minimum condensing pressure value, P, of the compressor operating rangemaxIs the maximum condensing pressure value of the compressor operation range.
Further, the operation range of the compressor is defined and expressed by a compression ratio I, and I is more than or equal to 2 and less than or equal to 8;
said evaporation pressure PeCorrespond toMinimum exhaust pressure value P ofsThe range of (A) is as follows: p is more than or equal to 0.56MPas≤2.40MPa。
Further, the outdoor motor is a direct current motor, and the rotating speed V of the direct current motor satisfies the following conditions: v is more than or equal to 200 and less than or equal to 800 rpm.
Another objective of the present invention is to provide an air conditioner for machine room, which includes an outdoor motor, a memory, a processor and a control program stored in the memory and running on the processor, wherein the control program, when executed by the processor, implements the steps of the control method for the outdoor motor as described above.
The invention also proposes a storage medium storing a control program which, when executed by a processor, implements the steps of the control method of the outdoor motor as described above.
The control method of the outdoor motor can be used for carrying out variable speed control on the motor of the outdoor fan of the machine room air conditioner, and during specific operation, the minimum exhaust pressure value corresponding to the evaporation pressure is obtained according to the preset running range of the compressor by monitoring the system condensation pressure after the compressor is started and the system evaporation pressure after the outdoor motor is started, and finally the rotating speed of the outdoor motor is adjusted in real time according to the obtained condensation pressure and the corresponding minimum exhaust pressure value, so that the exhaust pressure of the refrigeration system is adjusted, the phenomenon that the piston rod is damaged by compressor surge or load increase caused by too low exhaust pressure is prevented, the running reliability of the compressor is improved, and the service life of the compressor is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a flowchart of an embodiment of a control method of an outdoor motor according to the present invention;
fig. 2 is a schematic view of the range of pressure conditions for the R410A refrigerant compressor.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a control method of an outdoor motor, which can be used for carrying out variable speed control on a fan motor of a machine room air conditioner.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for controlling an outdoor motor according to an embodiment of the present invention.
In this embodiment, the control method includes the steps of:
s10: monitoring the condensing pressure P of a refrigeration system after the compressor has been startedc；
S20: when P is presentc＞PonWhen the motor is started, the outdoor motor is controlled to be started;
s30: monitoring the evaporating pressure P of the refrigerating system after the outdoor motor runs for a preset timee；
S40: acquiring the evaporation pressure P according to the preset operation range of the compressoreCorresponding minimum exhaust pressure value Ps；
S50: according to the obtained condensing pressure PcAnd a minimum exhaust pressure value PsAdjusting the rotating speed V of the outdoor motor in real time;
wherein, PonIs the condensation pressure value when the outdoor motor is started.
In this embodiment, the outdoor unit to which the control method of the outdoor motor is applied includes a compressor, a condenser, a throttling element, and an evaporator, which are connected in series to form a refrigerant loop, and when the control method is mainly used for performing variable speed control on a fan motor of an air conditioner in a machine room, the outdoor unit is mainly in a refrigeration operation state, that is, a high-temperature and high-pressure gaseous refrigerant, which has acted by the compressor, flows to the condenser, releases heat to the external environment through the condenser, converts the high-temperature and high-pressure gaseous refrigerant into a low-temperature liquid refrigerant, then enters the throttling element for further throttling and depressurizing, and becomes a low-temperature and low-pressure liquid refrigerant, and then the refrigerant in the refrigerant loop is sent to the evaporator by virtue of a pressure difference between two ends of the throttling element, in this embodiment, the evaporator is placed in the machine room, absorbs heat generated by, meanwhile, the refrigerant in the refrigerant loop absorbs the heat in the machine room through the evaporator, is evaporated into low-pressure gaseous refrigerant, and enters the compressor again to complete the refrigeration cycle.
In addition, outdoor unit still includes the outdoor fan that is used for adjusting the heat transfer intensity of condenser, outdoor fan is axial fan, axial fan adopts alternating current motor or direct current motor drive, and in this embodiment outdoor fan adopts direct current motor drive, direct current motor's rotational speed scope V satisfies: v is more than or equal to 200 and less than or equal to 800 rpm. In this embodiment, the outdoor unit further includes a first pressure sensor disposed in the condenser, a second pressure sensor disposed in the evaporator, and after the compressor is started, the condensing pressure P of the refrigeration system is read by the first pressure sensor disposed in the condensercReading the evaporating pressure P of the refrigerating system by a second pressure sensor arranged on the evaporatore(ii) a The first pressure sensor, the second pressure sensor, the compressor and the outdoor motor are all connected with a controller of the machine room air conditioner, the first pressure sensor and the second pressure sensor send collected condensation pressure data and evaporation pressure data to the controller to complete monitoring of the condensation pressure and the evaporation pressure of the refrigeration system, the controller controls the compressor to operate according to the condensation pressure data and the evaporation pressure data, and simultaneously adjusts the rotating speed of the outdoor fan according to the condensation pressure data and the evaporation pressure data, so that the heat exchange strength of the condenser is adjusted, the condensation pressure of the air conditioning system is adjusted, the compressor is enabled to operate in a safe operation range all the time in the operation process, the phenomenon that the compressor surges or loads are increased to damage a piston rod when the exhaust pressure is too low is prevented, and the operation reliability and the service life of the compressor are further influenced, the specific operation is as follows:
after a machine room air conditioner is electrified and a refrigeration instruction is received, the compressor is controlled to be started, the refrigerant in the compressor does work, high-temperature and high-pressure gaseous refrigerant is output, the gaseous refrigerant is driven by the pressure difference in the refrigerant loop and enters the condenser to exchange heat with the outer ring environment, a certain condensation pressure is formed in the condenser, the condensation pressure is the minimum pressure for enabling the high-temperature and high-pressure gaseous refrigerant to be changed into low-temperature liquid refrigerant, and after the compressor is started, the condensation pressure P of the refrigeration system is monitoredcIn the embodiment, the condensing pressure P of the refrigerating system is read by the first pressure sensorcAfter the compressor is started, the condensing pressure of the refrigerating system is gradually increased, and when the condensing pressure P is increasedcGreater than a predetermined value PonWhen the outdoor fan is controlled to start, namely the outdoor motor is controlled to start, the preset value P isonThe pressure value is the condensation pressure value when the outdoor motor is started, after the outdoor motor is started, the rotating speed of the outdoor motor and the condensation pressure are in a direct proportion relation within a certain time, namely, the rotating speed and the condensation pressure are gradually increased along with the increase of the condensation pressure, and after the outdoor motor runs for a preset time, the evaporation pressure P of the refrigeration system is detectedeIn the embodiment, the second pressure sensor reads the evaporating pressure P of the refrigeration systemeSaid evaporation pressure PeIn order to convert the liquid refrigerant passing through the evaporator into the gaseous refrigerant with the maximum pressure, each evaporation pressure corresponds to the minimum discharge pressure and corresponds to a condensation pressure within the operation range of the compressor, as shown in fig. 2, fig. 2 is a schematic diagram of the pressure condition range of the R410A refrigerant compressor, it can be clearly known in the diagram that the compressor of each air conditioner is provided with a compression ratio within the safe use range when using a certain type of refrigerant, as the compressor of the embodiment uses the R410A refrigerant, the preset operation range of the compressor is defined by the compression ratio I, I is greater than or equal to 2 and less than or equal to 8, and according to the schematic diagram of the pressure condition range of the compressor shown in fig. 2, the evaporation pressure P of the refrigeration system is detectedeThen according to said evaporation pressure PeThe corresponding minimum exhaust pressure value P can be foundsAccording to the control method provided in the present embodiment, the condensing pressure P is obtainedcAnd the evaporation pressurePeCorresponding minimum exhaust pressure value PsJust, just can real-time adjustment the rotational speed V of outdoor motor to the heat transfer intensity of adjustment condenser, and then adjustment air conditioning system's condensing pressure makes the compressor move all the time at safe operation scope in the operation process, prevents that the discharge pressure from leading to the fact compressor surge or load increase to damage the phenomenon of piston rod when low excessively, and then influences the operational reliability and the life of compressor.
The control method of the outdoor motor can be used for carrying out variable speed control on the motor of the outdoor fan of the machine room air conditioner, during specific operation, the minimum exhaust pressure value corresponding to the evaporation pressure is obtained according to the preset running range of the compressor by monitoring the system condensation pressure after the compressor is started and the system evaporation pressure after the outdoor motor is started, and finally the rotating speed of the outdoor motor is adjusted in real time according to the obtained condensation pressure and the minimum exhaust pressure value corresponding to the condensation pressure, so that the exhaust pressure of a refrigeration system is adjusted, the phenomenon that the compression ratio of the compressor is increased when the exhaust pressure is too low, the centrifugal compressor surges or the load of the piston compressor is increased, the piston rod is damaged is avoided, the running reliability of the compressor is improved, and the service life of the compressor is prolonged.
Further, based on the control method of the outdoor motor of the above-described embodiment, a second embodiment of the control method of the outdoor motor is proposed, in which the control method includes:
detecting the condensation temperature of the refrigerating system after the compressor is started;
determining the condensing pressure P of the refrigerating system according to the relationship between the predetermined condensing temperature and the condensing pressurec；
When P is presentc＞PonWhen the motor is started, the outdoor motor is controlled to be started;
detecting the evaporation temperature of the refrigeration system after the outdoor motor operates for a preset time;
determining the evaporating pressure P of the refrigerating system according to the relationship between the predetermined evaporating temperature and the evaporating pressuree；
According to presetsThe operating range of the compressor is obtained, and the evaporation pressure P is obtainedeCorresponding minimum exhaust pressure value Ps；
According to the obtained condensing pressure PcAnd a minimum exhaust pressure value PsAdjusting the rotating speed V of the outdoor motor in real time;
wherein, PonIs the condensation pressure value when the outdoor motor is started.
In this embodiment, the outdoor unit to which the control method of the outdoor motor is applied includes a compressor, a condenser, a throttling element, and an evaporator connected in series to form a refrigerant loop, and the control method is mainly used for performing variable speed control on a fan motor of an air conditioner in a machine room, so that the outdoor unit mainly performs a cooling operation state, that is, a high-temperature and high-pressure gaseous refrigerant after being acted by the compressor flows to the condenser, releases heat to an external environment through the condenser, converts the high-temperature and high-pressure gaseous refrigerant into a low-temperature and high-pressure liquid refrigerant, then enters the throttling element to further perform throttling and pressure reduction, and becomes a low-temperature and low-pressure liquid refrigerant, and then the refrigerant in the refrigerant loop is sent to the evaporator by means of a pressure difference between two ends of the throttling element, in this embodiment, the evaporator is placed in the machine room to absorb, meanwhile, the refrigerant in the refrigerant loop absorbs the heat in the machine room through the evaporator, is evaporated into low-pressure gaseous refrigerant, and enters the compressor again to complete the refrigeration cycle.
In addition, outdoor unit still includes the outdoor fan that is used for adjusting the heat transfer intensity of condenser, outdoor fan is axial fan, axial fan adopts alternating current motor or direct current motor drive, and in this embodiment outdoor fan adopts direct current motor drive, direct current motor's rotational speed scope V satisfies: v is more than or equal to 200 and less than or equal to 800 rpm. The outdoor unit further comprises a first temperature sensor arranged on the evaporator and a second temperature sensor arranged on the condenser, after the compressor is started, the condensation temperature of the refrigeration system is read through the first temperature sensor arranged on the condenser, and then the condensation pressure P of the refrigeration system is determined according to the relation between the predetermined condensation temperature and the predetermined condensation pressurecBy arranging in steamingThe second temperature sensor of the evaporator reads the evaporating temperature of the refrigerating system and then determines the evaporating pressure P of the refrigerating system according to the predetermined relationship between the evaporating temperature and the evaporating pressuree。
The first temperature sensor, the second temperature sensor, the compressor and the outdoor motor are all connected with a controller of the machine room air conditioner, the first temperature sensor and the second temperature sensor send collected condensation temperature data and evaporation temperature data to the controller, and because a determined corresponding relation exists between the condensation temperature and the condensation pressure, the condensation pressure corresponding to the condensation temperature can be obtained according to the condensation temperature without doubt, and similarly, because a determined corresponding relation also exists between the evaporation temperature and the evaporation pressure, the evaporation pressure corresponding to the evaporation temperature can be obtained according to the evaporation temperature without doubt, therefore, the controller can easily determine the condensation pressure and the evaporation pressure of the refrigeration system according to the condensation temperature data and the evaporation temperature data, and further control the operation of the compressor according to the condensation pressure data and the evaporation pressure data, simultaneously according to condensation pressure data and evaporation pressure data adjust the rotational speed of outdoor fan to the heat transfer intensity of adjustment condenser, and then the condensation pressure of adjustment air conditioning system for the compressor runs at safe operation scope all the time in the operation process, prevents that the discharge pressure from leading to the fact compressor surge or load to increase the phenomenon of damaging the piston rod when low excessively, and then influences the operational reliability and the life of compressor, and concrete operation is as follows:
after a machine room air conditioner is electrified and a refrigeration instruction is received, the compressor is controlled to be started, the refrigerant in the compressor does work, high-temperature and high-pressure gaseous refrigerant is output, the gaseous refrigerant is driven by the pressure difference in a refrigerant loop and enters a condenser to exchange heat with an outer ring environment, the condenser is provided with a first temperature sensor, the first temperature sensor is used for collecting the condensation temperature of the condenser, and then the condensation pressure P of a refrigeration system is determined according to the relation between the predetermined condensation temperature and the predetermined condensation pressurecThe condensing pressure is the minimum for changing high-temperature and high-pressure gaseous refrigerant into low-temperature liquid refrigerantPressure, after the compressor is started, the condensing pressure of the refrigerating system is gradually increased, when the condensing pressure P iscGreater than a predetermined value PonWhen the outdoor fan is controlled to start, namely the outdoor motor is controlled to start, the preset value P isonThe method comprises the steps that the condensation pressure value is obtained when an outdoor motor is started, after the outdoor motor is started, the rotating speed and the condensation pressure are in a direct proportion relation within a certain time, namely, the rotating speed and the condensation pressure are gradually increased along with the increase of the condensation pressure, after the outdoor motor runs for a preset time, the evaporation temperature of an evaporator is collected by a second temperature sensor arranged on the evaporator, and then the evaporation pressure P of a refrigeration system is determined according to the relation between the evaporation temperature and the evaporation pressure which are determined in advanceeSaid evaporation pressure PeIn order to convert the liquid refrigerant passing through the evaporator into the maximum pressure of the gaseous refrigerant, within the operating range of the compressor, each evaporation pressure corresponds to the minimum discharge pressure and corresponds to a condensation pressure, as shown in fig. 2, fig. 2 is a schematic diagram of the pressure condition range of the R410A refrigerant compressor, it can be clearly known in the diagram that the compressor of each air conditioner is provided with a compression ratio within a safe use range when using a certain type of refrigerant, as the compressor of the embodiment uses the R410A refrigerant, the preset operating range of the compressor is defined by the compression ratio I, I is greater than or equal to 2 and less than or equal to 8, and according to the schematic diagram of the pressure condition range of the compressor shown in fig. 2, the evaporation pressure P of the refrigeration system is obtained when the compressor uses the refrigeranteThen according to said evaporation pressure PeThe corresponding minimum exhaust pressure value P can be foundsAccording to the control method provided in the present embodiment, the condensing pressure P is obtainedcAnd the evaporation pressure PeCorresponding minimum exhaust pressure value PsJust, just can real-time adjustment the rotational speed V of outdoor motor to the heat transfer intensity of adjustment condenser, and then adjustment air conditioning system's condensing pressure makes the compressor move all the time at safe operation scope in the operation process, prevents that the discharge pressure from leading to the fact compressor surge or load increase to damage the phenomenon of piston rod when low excessively, and then influences the operational reliability and the life of compressor.
The control method of the outdoor motor can be used for carrying out variable speed control on the motor of the outdoor fan of the machine room air conditioner, during specific operation, the minimum exhaust pressure value corresponding to the evaporation pressure is obtained according to the preset running range of the compressor by monitoring the system condensation pressure after the compressor is started and the system evaporation pressure after the outdoor motor is started, and finally the rotating speed of the outdoor motor is adjusted in real time according to the obtained condensation pressure and the minimum exhaust pressure value corresponding to the condensation pressure, so that the exhaust pressure of a refrigeration system is adjusted, the phenomenon that the compression ratio of the compressor is increased when the exhaust pressure is too low, the surge of the centrifugal compressor is caused, or the load of the piston compressor is increased, so that a piston rod is damaged, the running reliability of the compressor is improved, and the service life of the compressor is.
Further, the condensation pressure P is obtained according to the obtainedcAnd a minimum exhaust pressure value PsAnd adjusting the rotating speed V of the outdoor motor in real time, wherein the step comprises the following steps of:
when P is presenton＜Pc≤PmaxWhen the outdoor motor runs at the rotating speed V, the rotating speed V is equal to Vmin+((Pc－Ps－Y)/X)×(Vmax－Vmin)；
Wherein, Pon＝(Ps+Y)bar，Pc＞PsX is a pressure ratio band, Y is an adjustable deviation, VminIs the minimum rotational speed, V, of the outdoor motormaxIs the maximum speed of the outdoor motor, PmaxIs the maximum condensing pressure value of the compressor operation range.
In this embodiment, after the compressor is started, the condensing pressure of the refrigeration system is gradually increased, and after the outdoor motor is started, a positive correlation exists between the rotating speed of the outdoor motor and the condensing pressure under a preset condition, that is, the rotating speed of the outdoor motor shows a linear function increasing trend along with the increase of the condensing pressure, specifically, when the condensing pressure P of the refrigeration system is increasedcSatisfy Pon＜Pc≤PmaxWhen the outdoor motor is started, the rotating speed V of the outdoor motor is controlled to meet the condition that V is equal to Vmin+((Pc－Ps－Y)/X)×(Vmax－Vmin) Wherein, during operation of the compressor, the systemCondensing pressure P of a cold systemcGreater than the corresponding evaporation pressure PeCorresponding minimum exhaust pressure value PsI.e. at the condensation pressure PcIn the interval [ Pon，Pmax]When is, Pc＞Ps，Pon＝(Ps+ Y) bar, said pressure proportional band X being 5 + -n1bar, the adjustable deviation Y is 1 +/-n2bar; wherein n is1≤5，n2Less than or equal to 1, and an empirical value PsWhen the rotating speed V of the direct current motor is not less than 800rpm and not more than 200rpm under the condition of 10bar, P ison＝10+1＝11bar，Pmax＝11+5＝16bar，Vmin＝200rpm，Vmax800rpm, when 11bar < PcWhen the voltage is less than or equal to 16bar, the rotating speed V of the outdoor motor shows a linear function increasing trend, namely V is 200+120 (P)c-11)＝120Pc1120bar, see when Pon＜Pc≤PmaxWhen the compressor is used, the outdoor motor increases along with the increase of the condensation pressure of the refrigeration system at the rotating speed V in a linear function trend so as to adjust the exhaust pressure of the refrigeration system, prevent the increase of the compression ratio of the compressor when the exhaust pressure is too low, cause the surging of the centrifugal compressor or cause the increase of the load of the piston compressor, further damage the piston rod, improve the operation reliability of the compressor and further prolong the service life of the compressor.
Further, the condensation pressure P is obtained according to the obtainedcAnd a minimum exhaust pressure value PsAnd adjusting the rotating speed V of the outdoor motor in real time, further comprising:
when P is presentc＜PoffWhen the outdoor motor is started, the outdoor motor is controlled to stop;
when P is presentoff≤Pc≤PonWhile controlling the outdoor motor to rotate at a minimum speed VminRunning;
when P is presentc＞PmaxWhile controlling the outdoor motor to rotate at the maximum rotating speed VmaxRunning;
wherein, PoffIs the minimum condensing pressure value, P, of the compressor operating rangemaxIs the maximum condensing pressure value of the compressor operation range.
In this embodiment, after the compressor starts, when refrigerating system's condensing pressure does not reach the condensing pressure value that outdoor fan started, refrigerating system's condensing pressure is along with the increase from the high-pressure gaseous state refrigerant of compressor exhaust high temperature, condensing pressure risees gradually, behind the condensing pressure value that is greater than outdoor fan starts, improve the heat exchange efficiency of condenser, increase the heat transfer intensity of condenser, refrigerating system's condensing pressure's rate of increase can slow down, or refrigerating system's condensing pressure can descend after a period of time, so need be according to the condensing pressure Pc who obtains when controlling outdoor motor variable speed, adjust the rotational speed V of outdoor motor in real time, specifically be: when the condensation pressure Pc of the refrigeration system is less than the minimum condensation pressure value P of the compressor operation rangeoffWhen the compressor is in an overcooling state, the refrigerant dilutes lubricating oil in the compressor to cause the compressor to lack oil, further damage the compressor and influence the service life of the compressor; when P is presentoff≤Pc≤PonWhile controlling the outdoor motor to rotate at a minimum speed VminThe operation is carried out by taking a direct current motor with the rotating speed V of 200 rpm-800 rpm as an example, and referring to the schematic diagram of the range of the pressure conditions of the R410A refrigerant compressor shown in FIG. 2, PoffThe minimum condensation pressure value of the compressor operation range is 0.56MPa, and the condensation pressure P of the outdoor motor startonThe value interval of (1.56 MPa) is less than or equal to PonLess than or equal to 3.40MPa, when P isonWhen the value is 1.66MPa, namely when the bar is less than or equal to 5.6bar and is less than or equal to PcWhen the pressure is less than or equal to 16.6bar, the outdoor motor is controlled to operate at the minimum rotating speed of 200rpm, so that the phenomenon that the compression ratio of the compressor is increased when the exhaust pressure is too low, the surge of a centrifugal compressor is caused, or the load of a piston type compressor is increased, a piston rod is damaged, the operation reliability of the compressor is improved, and the service life of the compressor is prolonged; when the condensing pressure P of the refrigerating systemcMaximum condensation pressure value P greater than compressor operation rangemaxWhile controlling the outdoor motor to rotate at the maximum rotating speed VmaxThe operation is carried out by taking a direct current motor with the rotating speed V of 200rpm and not more than V and not more than 800rpm as an exampleReferring to the schematic diagram of the range of the pressure conditions of the R410A refrigerant compressor shown in fig. 2, PmaxThe maximum condensing pressure value in the operating range of the compressor, as shown in FIG. 2, is the evaporating pressure PeP is more than or equal to 0.23MPaeLess than or equal to 1.15Mpa, and the minimum exhaust pressure PsP is more than or equal to 0.56MPasNot more than 2.40Mpa, the condensation pressure PcP is more than 0.56MPacNot more than 4.15Mpa, when P ismaxWhen the value is 2.16MPa, that is, when P iscWhen the pressure is higher than 21.6bar, the outdoor motor is controlled to run at the maximum rotating speed of 800rpm, the phenomenon that the compression ratio of the compressor is increased when the exhaust pressure is too low, the surge of the centrifugal compressor is caused, or the load of the piston compressor is increased, so that the piston rod is damaged, the running reliability of the compressor is improved, and the service life of the compressor is prolonged.
It should be noted that, in the embodiments of the present invention, the description of the pressure range only applies to the R410A refrigerant, and if the refrigerant is another type, the pressure range may also be changed.
The present invention further provides an air conditioner, which includes an outdoor motor, a memory, a processor, and a control program stored in the memory and running on the processor, wherein the control program, when executed by the processor, implements the following operations:
monitoring the condensing pressure P of a refrigeration system after the compressor has been startedc；
When P is presentc＞PonWhen the motor is started, the outdoor motor is controlled to be started;
monitoring the evaporating pressure P of the refrigerating system after the outdoor motor runs for a preset timee；
Acquiring the evaporation pressure P according to the preset operation range of the compressoreCorresponding minimum exhaust pressure value Ps；
According to the obtained condensing pressure PcAnd a minimum exhaust pressure value PsAdjusting the rotating speed V of the outdoor motor in real time;
wherein, PonIs the condensation pressure value when the outdoor motor is started.
Further, the control program when executed by the processor further performs the following operations:
after the compressor is started, the condensing pressure P of the refrigerating system is read by a first pressure sensor arranged on the condenserc(ii) a Or the like, or, alternatively,
after the compressor is started, the condensation temperature of the refrigeration system is read through a first temperature sensor arranged on the condenser, and then the condensation pressure P of the refrigeration system is determined according to the relation between the predetermined condensation temperature and the predetermined condensation pressurec。
Further, the control program when executed by the processor further performs the following operations:
after the outdoor motor runs for a preset time, reading the evaporation pressure P of the refrigeration system through a second pressure sensor arranged on the evaporatore(ii) a Or the like, or, alternatively,
after the outdoor motor runs for a preset time, reading the evaporation temperature of the refrigeration system through a second temperature sensor arranged on the evaporator, and determining the evaporation pressure P of the refrigeration system according to the relationship between the evaporation temperature and the evaporation pressure which are determined in advancee。
Further, the control program when executed by the processor further performs the following operations:
when P is presenton＜Pc≤PmaxWhen the outdoor motor runs at the rotating speed V, the rotating speed V is equal to Vmin+((Pc－Ps－Y)/X)×(Vmax－Vmin)；
Wherein, Pon＝(Ps+Y)bar，Pc＞PsX is a pressure ratio band, Y is an adjustable deviation, VminIs the minimum rotational speed, V, of the outdoor motormaxIs the maximum speed of the outdoor motor, PmaxIs the maximum condensing pressure value of the compressor operation range.
Further, the pressure proportional band X is 5 ± n1The adjustable deviation Y is 1 +/-n2(ii) a Wherein n is1≤5，n2≤1。
Further, the control program when executed by the processor further performs the following operations:
when P is presentc＜PoffWhen the outdoor motor is started, the outdoor motor is controlled to stop;
when P is presentoff≤Pc≤PonWhile controlling the outdoor motor to rotate at a minimum speed VminRunning;
when P is presentc＞PmaxWhile controlling the outdoor motor to rotate at the maximum rotating speed VmaxRunning;
wherein, PoffIs the minimum condensing pressure value, P, of the compressor operating rangemaxIs the maximum condensing pressure value of the compressor operation range.
Further, the operation range of the compressor is defined and expressed by a compression ratio I, and I is more than or equal to 2 and less than or equal to 8;
said evaporation pressure PeCorresponding minimum exhaust pressure value PsThe range of (A) is as follows: p is more than or equal to 0.56MPas≤2.40MPa。
Further, the outdoor motor is a direct current motor, and the rotating speed V of the direct current motor satisfies the following conditions: v is more than or equal to 200 and less than or equal to 800 rpm.
The air conditioner of this embodiment, mainly carry out variable speed control to the motor of outdoor fan, when concrete operation, through the system condensation pressure after monitoring the compressor start and the system evaporation pressure after the outdoor motor starts, obtain the minimum exhaust pressure value that evaporation pressure corresponds according to the operating range of preset compressor, finally according to the minimum exhaust pressure value that obtains condensation pressure and its correspondence, the rotational speed of outdoor motor is adjusted in real time, and then the exhaust pressure of adjustment refrigerating system, prevent that the exhaust pressure from leading to the fact the compression ratio increase of compressor when low excessively, cause centrifugal compressor surge, or cause the load increase of piston compressor, and then the phenomenon of damaging the piston rod, the operational reliability of compressor has been improved, thereby the life of compressor has been prolonged.
Furthermore, an embodiment of the present invention further provides a storage medium, in which a control program is stored, and the control program, when executed by a processor, implements the steps of the control method for the outdoor motor as described above.
The method for implementing the control program when executed may refer to various embodiments of the control method for the outdoor motor of the present invention, and will not be described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A control method of an outdoor motor is characterized by comprising the following steps:
monitoring the condensing pressure P of a refrigeration system after the compressor has been startedc；
When P is presentc＞PonWhen the motor is started, the outdoor motor is controlled to be started;
monitoring the evaporating pressure P of the refrigerating system after the outdoor motor runs for a preset timee；
Acquiring the evaporation pressure P according to the preset operation range of the compressoreCorresponding minimum exhaust pressure value Ps；
According to the obtained condensing pressure PcAnd a minimum exhaust pressure value PsAdjusting the rotating speed V of the outdoor motor in real time;
wherein, PonThe condensation pressure value is the condensation pressure value when the outdoor motor is started;
according to the obtained condensing pressure PcAnd a minimum exhaust pressure value PsAnd adjusting the rotating speed V of the outdoor motor in real time, wherein the step comprises the following steps of:
when P is presenton＜Pc≤PmaxWhen the outdoor motor runs at the rotating speed V, the rotating speed V is equal to Vmin+((Pc－Ps－Y)/X)×(Vmax－Vmin)；
Wherein, Pon＝(Ps+Y)bar，Pc＞PsX is a pressure ratio band, Y is an adjustable deviation, VminIs the minimum rotational speed, V, of the outdoor motormaxIs the maximum speed of the outdoor motor, PmaxIs the maximum condensing pressure value of the compressor operation range.
2. Control method according to claim 1, characterized in that the condensation pressure P of the refrigeration system is monitored after the compressor has been startedcThe method specifically comprises the following steps:
after the compressor is started, the condensing pressure P of the refrigerating system is read by a first pressure sensor arranged on the condenserc(ii) a Or the like, or, alternatively,
after the compressor is started, the condensation temperature of the refrigeration system is read through a first temperature sensor arranged on the condenser, and then the condensation temperature is determined according to the predetermined condensationThe relation between the temperature and the condensing pressure determines the condensing pressure P of the refrigerating systemc。
3. Control method according to claim 1 or 2, characterized in that the evaporation pressure P of the refrigeration system is monitored after the outdoor motor has been running for a preset length of timeeThe method specifically comprises the following steps:
after the outdoor motor runs for a preset time, reading the evaporation pressure P of the refrigeration system through a second pressure sensor arranged on the evaporatore(ii) a Or the like, or, alternatively,
after the outdoor motor runs for a preset time, reading the evaporation temperature of the refrigeration system through a second temperature sensor arranged on the evaporator, and determining the evaporation pressure P of the refrigeration system according to the relationship between the evaporation temperature and the evaporation pressure which are determined in advancee。
4. Control method according to claim 1, characterized in that the pressure proportional band X-5 ± n1The adjustable deviation Y is 1 +/-n2(ii) a Wherein n is1≤5，n2≤1。
5. Control method according to claim 1, characterized in that said function is based on the condensation pressure P obtainedcAnd a minimum exhaust pressure value PsAnd adjusting the rotating speed V of the outdoor motor in real time, further comprising:
when P is presentc＜PoffWhen the outdoor motor is started, the outdoor motor is controlled to stop;
when P is presentoff≤Pc≤PonWhile controlling the outdoor motor to rotate at a minimum speed VminRunning;
when P is presentc＞PmaxWhile controlling the outdoor motor to rotate at the maximum rotating speed VmaxRunning;
wherein, PoffIs the minimum condensing pressure value, P, of the compressor operating rangemaxIs the maximum condensing pressure value of the compressor operation range.
6. The control method according to claim 1, characterized in that the operating range of the compressor is defined in terms of compression ratio I, 2 ≦ I ≦ 8;
said evaporation pressure PeCorresponding minimum exhaust pressure value PsThe range of (A) is as follows: p is more than or equal to 0.56MPas≤2.40MPa。
7. The control method according to claim 1, wherein the outdoor motor is a direct current motor, and a rotating speed V of the direct current motor satisfies: v is more than or equal to 200 and less than or equal to 800 rpm.
8. An air conditioner, characterized in that the air conditioner comprises an outdoor motor, a memory, a processor and a control program stored in the memory and running on the processor, wherein the control program, when executed by the processor, implements the steps of the control method according to any one of claims 1 to 7.
9. A storage medium, characterized in that the storage medium stores a control program which, when executed by a processor, implements the steps of the control method according to any one of claims 1 to 7.
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| CN109612014B (en) * | 2018-12-18 | 2020-12-04 | 重庆美的通用制冷设备有限公司 | Air conditioning unit control method, device and system and air conditioning unit |
| CN111750506A (en) * | 2020-07-06 | 2020-10-09 | 深圳市英维克科技股份有限公司 | Control system and control method of condensing fan |
| CN112283817A (en) * | 2020-09-17 | 2021-01-29 | 珠海格力电器股份有限公司 | Central air-conditioning system and control method thereof |
| CN113446710B (en) * | 2021-03-25 | 2023-06-20 | 青岛海尔空调电子有限公司 | Air conditioner control method and device and air conditioner |
| CN113108509A (en) * | 2021-04-21 | 2021-07-13 | 荏原冷热系统（中国）有限公司 | Method for obtaining surge curve of cooling and heating unit and related device |
| CN116242069B (en) * | 2023-02-22 | 2023-11-14 | 哲弗智能系统（上海）有限公司 | Control method and device of water cooler system and water cooler system |
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