CN103882665A - Control method of inverter compressor of heat pump clothing dryer and heat pump clothing dryer - Google Patents
Control method of inverter compressor of heat pump clothing dryer and heat pump clothing dryer Download PDFInfo
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- CN103882665A CN103882665A CN201210563414.6A CN201210563414A CN103882665A CN 103882665 A CN103882665 A CN 103882665A CN 201210563414 A CN201210563414 A CN 201210563414A CN 103882665 A CN103882665 A CN 103882665A
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F58/00—Domestic laundry dryers
- D06F58/30—Drying processes
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/02—Characteristics of laundry or load
- D06F2103/08—Humidity
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F58/00—Domestic laundry dryers
- D06F58/32—Control of operations performed in domestic laundry dryers
- D06F58/34—Control of operations performed in domestic laundry dryers characterised by the purpose or target of the control
- D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry
- D06F58/38—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry of drying, e.g. to achieve the target humidity
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F58/00—Domestic laundry dryers
- D06F58/32—Control of operations performed in domestic laundry dryers
- D06F58/34—Control of operations performed in domestic laundry dryers characterised by the purpose or target of the control
- D06F58/50—Responding to irregular working conditions, e.g. malfunctioning of blowers
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Abstract
The invention discloses a control method of an inverter compressor of a heat pump clothing dryer and the heat pump clothing dryer. The heat pump clothing dryer comprises a heat pump clothing drying system comprising a heat pump module comprising the inverter compressor, a condenser, a throttling device and an evaporator, or further comprises a fan used for decreasing the temperature of the surface of the inverter compressor to adjust the load. In the clothing drying process, the operating frequency of the inverter compressor is controlled segmentally; the method includes compressor frequency rising control, compressor frequency inverting control and clothing drying finish determination. If a set clothing drying condition is not achieved after detection, the processes of compressor frequency inverting control and clothing drying finish determination are repeated circularly. The compressor frequency rising control means controlling the inverter compressor to rise the frequency to an ultimate frequency and operate stably; the compressor frequency inverting control means adjusting the operating frequency of the inverter compressor segmentally corresponding to the detection temperature. the control method and the heat pump clothing method have the advantages that drying efficiency is improved, operating efficiency of the inverter compressor is optimized, and service life of the inverter compressor is prolonged.
Description
Technical field
The present invention relates to a kind of clothes-drying device and drying control method, especially a kind ofly control clothes drying process to reduce control method and the heat pump clothes dryer of heat pump clothes dryer frequency-changeable compressor of energy consumption by stage.
Background technology
In existing heat-pump-type clothes drying device, be provided with following air circulation duct: the hot-air that adds that was carried out heating by the condenser in heat pump circulating system is admitted in the hothouse that clothing is housed, the humid air of having captured moisture from clothing is sent back to evaporimeter and dehumidifies, air after dehumidifying is heated by condenser again, and sends in hothouse.
Heat pump clothes dryer drying system, the pressure of compressor assembly tolerance is saturation pressure corresponding to temperature between 60～70 ℃ of cold-producing medium correspondences, is drying the later stage, with the rising of temperature, the condensation temperature of compressor can approach the limit value of maximum pressure.Existing drum-type heat pump clothes dryer, is designed with auxiliary condenser and accessory fan, so that drying the later stage or accessory fan action in hot environment, compressor load is regulated.Owing to adopting single control temperature setting processed, in the mid-early stage of drying, all promote as much as possible bake out temperature, be beneficial to completing of oven dry in mid-early stage; But in the later stage, in cylinder, temperature raises, drying air humidity is reducing, the condensation point needing is reducing, although humidity reduces to make the load reduction of evaporimeter, temperature also reduces, because the power load of compressor is moved in high value, the heat that enters cylinder does not reduce, and the decline of evaporator temperature is less than the decline of air dew point temperature; And the use of condensation fan makes in the more entered environment of heat, result is to have increased power consumption in the oven dry later stage, reduces dehumidification rate.
Application number is the clothes drying device that 200610153406.9 Chinese patent discloses a kind of heat pump that can make to be created in the drying air circulating between hothouse and heat pump and realize stable operation.Wherein, carried out the air of heating send in the steel ladle as hothouse by the heater in heat pump, the air of discharging from steel ladle is got back to heat pump through filter unit, by delivering to heater after heat dump dehumidifying, forms air circulation duct again.In filter unit, be provided with line bits filter, and be provided with the pipeline being connected with air outlet and air introducing port.
Application number is that 200410097855.7 Chinese patent discloses a kind of clothes drying device, comprising: heat pump assembly; Drying air is guided to heat dump, the radiator of heat pump assembly and the air channel of the drying chamber of clothing is housed; To the air blast of sending into drying air in described air channel; And control device.In drying operating process, compressor and air blast operate; In the time that drying operation occurs to interrupt, control device makes compressor stop official hour.
The clothes-drying device of above-mentioned employing heat pump drying mode, higher in environment temperature, under 35～40 ℃ of environment, dry the incipient stage, the air themperature being blown in laundry/drying cylinder rises to rapidly more than 60 ℃, and from the air themperature blowing out in laundry/drying cylinder, humidity also rises rapidly.In this case, the refrigerant saturation pressure in evaporimeter is higher, and the load of compressor assembly is large, reaches very soon the critical operating pressure of compressor.To invariable frequency compressor system, also can exceed the heat radiation scope of auxiliary heat dissipation blower fan and auxiliary condenser, compressor can quit work due to hypertonia and excessive discharge temperature, compressor interruption work in drying course, can impact compressor part performance, increase fault rate.If adopt frequency-changeable compressor system, although compressor can be adjusted by control system the operating frequency of compressor, compressor operating load is regulated, frequency-changeable compressor self also has individual lowest operating frequency scope.The high load capacity work of refrigeration system, causes compressor electric motor fault rate high, reduces service life.
In view of this special proposition the present invention.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the deficiencies in the prior art, provides a kind of control by stages compressor frequency to realize accurate control and then to improve the control method that is optimized, reduces the heat pump clothes dryer frequency-changeable compressor of drying energy consumption when drying efficiency to drying electricity consumption.
Another object of the present invention is to improve the heat pump clothes dryer with above-mentioned control method.
For solving the problems of the technologies described above, the present invention adopts the basic conception of technical scheme to be: a kind of control method of heat pump clothes dryer frequency-changeable compressor, in clothes drying process, the running frequency of control by stages frequency-changeable compressor, by starting to finishing to comprise that successively the control of compressor raising frequency, compressor variable frequency control and drying finish to judge, if detect the drying condition that does not reach setting, be cycled to repeat compressor variable frequency control and drying and finish the process of judging, wherein, the control of compressor raising frequency refers to and controls frequency-changeable compressor raising frequency to final frequency stable operation; Compressor variable frequency control refers to that corresponding detected temperatures adjusts the running frequency of frequency-changeable compressor stage by stage.
Further, after the control of compressor raising frequency completes, do not reach under the condition of the upper limit meeting frequency-changeable compressor input current or compressor exhaust temperature or condenser temperature, control after time that frequency-changeable compressor sets with the final frequency operation of raising frequency or detected temperatures reach setting value and enter again compressor variable frequency control; Otherwise the condition that reaches the upper limit directly enters compressor variable frequency control.The condition of this upper limit refers to the maximum current that compressor allows, or the peak of compressor exhaust temperature permission, or the condenser temperature peak of reflection condensing pressure.Different compressors, above-mentioned upper limit limit value is also different.
Or, be between the control of compressor raising frequency and compressor variable frequency control, to increase the evaporimeter antifrost control stage from above-mentioned different scheme.The evaporimeter antifrost control stage refers to that improving fast bake out temperature avoids evaporimeter frosting, because frosting is conventionally relevant with temperature and humidity, detecting evaporimeter will frosting time, the operating frequency of controlling frequency-changeable compressor raises a undergarment is rapidly heated fast, evaporator temperature, higher than 0 ℃, reaches the object of avoiding frosting.
Further, after the evaporimeter antifrost control stage, after reaching setting value, the time that control frequency-changeable compressor is set with the final frequency operation of raising frequency or detected temperatures enter again compressor variable frequency control.
On the basis of such scheme, further, described compressor raising frequency control refers to fix the speed raising frequency stage by stage of raising frequency, and per stage raising frequency enters next stage after finishing to stablize regular time again, until final frequency.Preferably, the speed of this fixing raising frequency is 1Hz/s～1Hz/60s, and this raising frequency speed is relevant with the live load of frequency-changeable compressor with the drying parameter of dryer.
Further, described compressor variable frequency control comprise the frequency reducing antifrost stage and stage by stage control frequently, the frequency reducing antifrost stage referred in the easy frosting of the evaporimeter stage reduces frequency according to detected temperatures control frequency-changeable compressor; Control refers to that per stage determines whether and reaches this stage design temperature according to detected temperatures, selection raising frequency or frequency reducing control frequently stage by stage.
Further, after frequency-changeable compressor raising frequency finishes, detect condenser temperature go out a temperature or evaporator temperature lower than setting value, or condenser temperature and the poor setting value that is less than of compressor exhaust temperature, or evaporator outlet and inlet temperature differential are while being less than setting value, the easy frosting of evaporimeter, or liquid refrigerant easily sucks compressor, now control frequency-changeable compressor segmentation and reduce frequency, if while being reduced to the minimum operation frequency H1 of setting still in the easy frosting state of evaporimeter, after certain hour, control the final frequency operation being elevated to the control of compressor raising frequency again after frequency-changeable compressor setting-up time out of service.
Further, frequency-changeable compressor raising frequency, after one section of setting-up time of final frequency stable operation, is controlled frequency-changeable compressor frequency change and is become inverse relationship with detected temperatures, and detected temperatures raises and frequency reduction, carries out stage by stage; Be specially, control refers to frequency-changeable compressor running frequency is divided into multiple stages frequently stage by stage, set up corresponding relation with detected temperatures, temperature is higher, controlling run frequency is lower, in each stage, whether detected temperatures reaches design temperature corresponding to this stage, enters next stage if reach corresponding running frequency adjustment reduction frequency; If do not reach, adjust this stage running frequency and be not less than frequency corresponding to this phase temperature; Compressor control is provided with minimum operation frequency H2 frequently, controls frequency conversion and is not less than this minimum operation frequency.
Further, the described evaporimeter antifrost control stage is raising frequency antifrost, adjust the condition that the direct running frequency to setting of frequency-changeable compressor and frequency-changeable compressor input current or compressor exhaust temperature or condenser temperature do not reach the upper limit, the running frequency of this setting is greater than the final frequency that the control of compressor raising frequency is elevated to.
Further, described detected temperatures refers to that detecting dryer enters a temperature, or goes out a temperature, or compressor exhaust temperature, or evaporator temperature, or condenser temperature.
Further, described final frequency is the target frequency of setting, or final frequency is to work as frequency-changeable compressor input current or compressor exhaust temperature or condenser temperature to reach the corresponding frequency of prescribing a time limit.
In said process, further, finish to increase the air-blower control stage between judgement in compressor variable frequency control and drying, this not necessarily process of air-blower control stage, the air-blower control stage increasing is the same with the air-blower control program of existing heat pump clothes dryer invariable frequency compressor, in the time that detected temperatures or compressor input current exceed the permissible value of setting, fan operation; When detected temperatures or compressor input current set value lower than another, blower fan cuts out; This process detected temperatures is preferably compressor exhaust temperature or condenser temperature.
Heat pump clothes dryer of the present invention, comprises heat pump clothes-drying system, heat pump clothes-drying system comprise there is frequency-changeable compressor, the heat pump module of condenser, throttling arrangement and evaporimeter.Or further, also comprise for the blower fan with adjusting load to frequency-changeable compressor surface cooling.
The airflow function that described blower fan drives is on the heat exchange area of frequency-changeable compressor, condenser is provided with the condenser temperature sensor that detects condenser temperature near refrigerant outlet, or be provided with the evaporator air temperature sensor that detects evaporator temperature in evaporimeter air intake vent direction, or be provided with the compressor temperature sensor that detects compressor exhaust temperature in frequency-changeable compressor exhaust ports, again or, be located at cylinder air inlet or air outlet and detect into a temperature or go out the outlet and inlet temperature sensor of a temperature.
Adopt after technique scheme, the present invention compared with prior art has following beneficial effect.
Heat pump clothes dryer of the present invention is divided the different stages by the control of frequency-changeable compressor in clothes drying process, the running frequency of control by stages frequency-changeable compressor, different phase is according to the ruuning situation detecting, control in different ways the running frequency of frequency-changeable compressor as raising frequency, frequency reducing etc., improve the control accuracy of whole drying course, reduce the energy consumption of compressor, increased dehumidifying drying effect, further reduced the possibility of evaporimeter frosting; Adopt the mode of stage frequency reducing drying the later stage, can effectively regulate the live load of compressor, extended compressor service life, reduced drying energy consumption.
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is heat pump clothes-drying system schematic of the present invention;
Fig. 2 is heat pump clothes dryer schematic diagram of the present invention;
Fig. 3 is heat pump clothes dryer control flow one schematic diagram of the present invention;
Fig. 4 is heat pump clothes dryer control flow two schematic diagrames of the present invention;
Fig. 5 is heat pump clothes dryer control flow three schematic diagrames of the present invention;
Fig. 6 is heat pump clothes dryer control flow four schematic diagrames of the present invention;
Fig. 7 is compressor raising frequency control flow schematic diagram of the present invention;
Fig. 8 is compressor variable frequency control flow schematic diagram of the present invention;
Fig. 9 is air-blower control schematic flow sheet of the present invention;
Figure 10 is evaporimeter antifrost control flow schematic diagram of the present invention;
1 cylinder, 2 Air Blast fans, 3 frequency-changeable compressors, 4 condensers, 5 throttling arrangements, 6 evaporimeters, 7 blower fans, 8 condenser temperature sensor, 9 evaporator air temperature sensors, 10 compressor temperature sensors
The specific embodiment
As depicted in figs. 1 and 2, heat pump clothes dryer of the present invention comprises cylinder 1 and is provided with the heat pump clothes-drying system of cylinder below, hot blast heat pump clothes-drying system being produced by Air Blast fan 2 imports to cylinder inner drying clothing by drying air channel, heat pump clothes-drying system comprises having frequency-changeable compressor 3, condenser 4, the heat pump module of throttling arrangement 5 and evaporimeter 6, also comprise for the blower fan 7 with adjusting load to frequency-changeable compressor 3 surface coolings, the airflow function that described blower fan 7 drives is on the heat exchange area of frequency-changeable compressor 3, condenser 4 is provided with the condenser temperature sensor 8 that detects condenser temperature near refrigerant outlet, or be provided with the evaporator air temperature sensor 9 that detects evaporator temperature in evaporimeter 6 air intake vent directions, or be provided with the compressor temperature sensor 10 that detects compressor exhaust temperature in frequency-changeable compressor 3 exhaust ports, again or, being located at cylinder air inlet or air outlet detects into a temperature or goes out entering of a temperature, leaving air temp sensor (not shown).
Embodiment mono-
As shown in Figure 3, be the heat pump clothes dryer drying work schematic flow sheet described in the present embodiment.In clothes drying process, the running frequency of control by stages frequency-changeable compressor, by starting to finishing to comprise that successively the control of compressor raising frequency, compressor variable frequency control, air-blower control and drying finish to judge, if detect the drying condition that does not reach setting, be cycled to repeat compressor variable frequency control, air-blower control and drying and finish the process of judging, wherein, the control of compressor raising frequency refers to and controls frequency-changeable compressor raising frequency to final frequency H0 stable operation; Compressor variable frequency control refers to that corresponding detected temperatures adjusts the running frequency of frequency-changeable compressor stage by stage.
Above-mentioned detected temperatures refers to that detecting dryer enters a temperature, or goes out a temperature, or compressor exhaust temperature, or evaporator temperature, or condenser temperature.Described final frequency H0 is the target frequency of setting, or, final frequency H0 works as frequency-changeable compressor input current or compressor exhaust temperature or condenser temperature to reach the corresponding frequency of prescribing a time limit, it is frequency-changeable compressor control ascent stage frequently, monitor compressor operating electric current I, or the compressor exhaust temperature of the condenser surface temperature of reflection condenser temperature or reflection compressor internal temperature, or evaporator temperature etc., if the parameter of above-mentioned monitoring meets the requirements of limit value, to keep running frequency be now final frequency H0 to frequency-changeable compressor, even if this running frequency does not rise to the target frequency of setting, also no longer rise.
The above-mentioned air-blower control stage, as shown in Figure 9, the same with the invariable frequency compressor working procedure of prior art, can set condenser temperature/compressor exhaust temperature/compressor input current and exceed permissible value TC2/TD2/I2 time, fan operation; At condenser temperature/compressor exhaust temperature/compressor input current, lower than setting value when TC3/TD3/I3, blower fan cuts out.TC2＞TC3、TD2＞TD3、I2＞I3。Generally choose TC2 for not higher than 68 ℃, TC3 is (TC3-3)
65℃, TD2 is 105 ℃, TD3 is 100 ℃.
Embodiment bis-
As shown in Figure 4, the present embodiment is on the basis of above-described embodiment one, between the control of compressor raising frequency and variable frequency control, increase following control mode, detect frequency-changeable compressor input current or compressor exhaust temperature or condenser temperature and whether reach the upper limit, the condition that reaches the upper limit directly enters compressor variable frequency control; If do not reach upper bound condition, control time that frequency-changeable compressor sets with the operation of the final frequency of raising frequency control if t=30min or detected temperatures are as condenser temperature or go out after a temperature reaches setting value to enter compressor variable frequency control again.The condition of this upper limit refers to the maximum current that compressor allows, or the peak of compressor exhaust temperature permission, or the condenser temperature peak of reflection condensing pressure.Different compressors, above-mentioned upper limit limit value is also different.
Embodiment tri-
As shown in Figure 5, the present embodiment, on the basis of embodiment mono-, increases the evaporimeter antifrost control stage between the control of compressor raising frequency and variable frequency control.The evaporimeter antifrost control stage is the air themperature fast rise that enters evaporimeter by control; Because frosting is conventionally relevant with temperature and humidity, detecting evaporimeter will frosting time, the operating frequency of controlling frequency-changeable compressor raises fast and makes be rapidly heated dry minimizing humidity and raising fast by the air themperature of evaporimeter of a undergarment.
Embodiment tetra-
As shown in Figure 6, the present embodiment is on the basis of above-described embodiment three, after the operation evaporimeter antifrost control stage, control time that frequency-changeable compressor sets with the operation of the final frequency of raising frequency if t=30min or detected temperatures are as condenser temperature or go out after a temperature reaches setting value to enter compressor variable frequency control again.
Heat pump clothes dryer control flow in above-described embodiment one to embodiment tetra-, the described air-blower control stage is not necessary, can not use this stage yet, only includes the control of compressor raising frequency, compressor variable frequency control and drying and finishes to judge.
Embodiment five
As shown in Figure 7, the present embodiment is described compressor raising frequency control flow schematic diagram, the control of compressor raising frequency refers to fix the speed raising frequency stage by stage of raising frequency, per stage raising frequency enters next stage after finishing to stablize regular time again, until final frequency, this final frequency is the frequency of setting, or is the frequency that condenser temperature/compressor exhaust temperature/compressor input current reaches time-termination operation; Per stage all will detect whether reach condenser temperature/compressor exhaust temperature/compressor input current upper limit corresponding to this stage compression machine running frequency.After frequency-changeable compressor starts, compressor operation frequency rises to final frequency H0 gradually from low speed, rather than directly turns round with highest frequency.Compressor frequency rises and is divided into multiple stages, rises to move 0.5～3 minute after each stage after steadily and rise, and when rising, speed is 1Hz/s～1Hz/60s; For example 28～40Hz, 40～50Hz, 50～60Hz; Directly do not rise to highest frequency herein and be for: 1, prevent that the oil of frequency-changeable compressor inside is after rotating speed rises suddenly, the oil mass of getting back to frequency-changeable compressor from heat exchanger is less than the oil mass of discharge, causes lubricated badly, increases the wearing and tearing of frequency-changeable compressor inner part.2, the device not evaporation completely of cold-producing medium while starting that avoids evaporating, makes liquid refrigerant enter compressor, and the lubricating oil of dilution frequency-changeable compressor inside, causes lubricated bad.
Be specially, frequency-changeable compressor starts with minimum speed, minimum speed is with compressor model and arrange relevant, first according to the speed rising of 1Hz/s, detect compressor input current/delivery temperature/condenser temperature and whether reach the upper limit, as being limited to 110 ℃ in this stage compression machine delivery temperature, on condenser temperature, be limited to 65 ℃, the compressor input current upper limit is relevant with compressor model, reach the upper limit, reach compressor operating frequency in limited time as final frequency take this, otherwise do not reach the upper limit compressor continue according to the speed raising frequency of 1Hz/s to first object frequency 40Hz, under this frequency, move setting-up time after 3 minutes, again with the speed rising of 1Hz/s, enter second stage, on compressor exhaust temperature corresponding to this stage, be limited to 110 ℃, on condenser temperature, be limited to 70 ℃, target frequency is 50Hz, under this 50Hz frequency, move setting-up time after 3 minutes, continue to enter the phase III according to the speed raising frequency of 1Hz/s, on compressor exhaust temperature corresponding to phase III, be limited to 110 ℃, on condenser temperature, be limited to 70 ℃, target frequency is 60Hz, this compressor final frequency is 60Hz, therefore reach after target frequency, the raising frequency control stage finishes, if target frequency is 70Hz, continue in the manner described above raising frequency operation.Said process, frequency-changeable compressor raising frequency to target frequency stable operation a period of time as after 3 minutes, the temperature of controlling temperature in the condenser temperature of frequency-changeable compressor frequency change and detection or cylinder or entering the reflection oven dry such as a temperature becomes inverse relationship, temperature raises and frequency reduction, and corresponding each stage carries out.
Embodiment six
As shown in Figure 8, the present embodiment is described compressor variable frequency control flow schematic diagram, described compressor variable frequency control comprise the frequency reducing antifrost stage and stage by stage control frequently, the frequency reducing antifrost stage referred in the easy frosting of the evaporimeter stage reduces frequency according to detected temperatures control frequency-changeable compressor; Control refers to that per stage determines whether and reaches this stage design temperature according to detected temperatures, selection raising frequency or frequency reducing control frequently stage by stage.After frequency-changeable compressor raising frequency finishes, detect condenser temperature or go out a temperature or evaporator temperature is less than while setting value lower than setting value or the poor setting value or evaporator outlet and inlet temperature differential of being less than of condenser temperature and compressor exhaust temperature, control frequency-changeable compressor segmentation and reduce frequency, if still in the easy frosting state of evaporimeter, control the final frequency operation being elevated to the control of compressor raising frequency again after frequency-changeable compressor setting-up time out of service after certain hour while being reduced to the minimum operation frequency H1 of setting.
Control refers to frequently stage by stage, frequency-changeable compressor running frequency is divided into multiple stages, set up corresponding relation with detected temperatures, temperature is higher, controlling run frequency is lower, in each stage, whether detected temperatures reaches design temperature corresponding to this stage, enters next stage if reach corresponding running frequency adjustment reduction frequency; If do not reach, adjust this stage running frequency and be not less than frequency corresponding to this phase temperature; Compressor control is provided with minimum operation frequency H2 frequently, controls frequency conversion and is not less than this minimum operation frequency.
When compressor raising frequency reaches the rotating speed of target of setting or reach after the maximum speed that limit value requires to final frequency H0, enter variable frequency control, the now frequency adjustment of frequency-changeable compressor, according to enter a temperature/go out a temperature/compressor exhaust temperature/evaporator temperature/condenser temperature regulate or apart from last time frequency adjustment time regulate; For example:
After frequency-changeable compressor starts and operates steadily, if temperature sensor perception 1, condenser temperature for example, lower than setting value (setting value 30 ℃); 2 or go out a temperature lower than setting value; 3 or evaporator temperature be less than 0 ℃; 4 or condenser temperature and compressor exhaust temperature is poor is less than a certain value; 5 or evaporator outlet and inlet temperature differential be less than a certain value, above-mentioned 1/2/3 shows that frosting can occur evaporimeter, 4/5 shows cold-producing medium evaporation not exclusively, may have liquid to suck compressor time, compressor operating reduces certain frequency 5Hz, after frequency adjustment, interval certain hour is after the correct indicating status of temperature sensor changes, judge adjusting next time, until above-mentioned state disappears, or compressor frequency drops to the frequency values H1 of setting, H1 can make dryer under low temperature environment, can make temperature rising to the frequency of eliminating evaporimeter frosting.If frequency drops to H1; above-mentioned state disappears not yet; and state duration exceeded setting-up time T1 as 30 minutes; meaning evaporimeter frosting may be more serious; now frequency-changeable compressor time T 2 out of service, minimum 3 minutes, melts evaporimeter frosting by the heat of cylinder inner circulating air; frequency-changeable compressor restarts operation afterwards, carries out raising frequency program to running frequency before final frequency 60Hz or compressor shutdown.
If above-mentioned state disappears, condenser temperature is higher than 30 ℃ of setting values, and compressor frequency enters the segmentation control stage.Running frequency is divided into multiple stages, and with condenser temperature or go out a temperature and set up corresponding relation, condensator outlet temperature is higher, and running frequency section is lower.In each frequency band, adjust actual motion frequency according to compressor operating condenser temperature/compressor exhaust temperature/input current etc., make the frequency may be lower than the initial launch frequency in stage.The low-limit frequency in frequency stage is set as H2, H2≤H1; If in the time that frequency is reduced to H2, compressor occurs that condenser temperature/compressor exhaust temperature/input current exceedes permissible value condenser temperature permissible value TC1/ compressor exhaust temperature permissible value TD1/ input current permissible value I1, TC1 > TC2 > TC3, TD1 > TD2 > TD3, I1 > I2 > I3; Compressor recovers original frequency operation again after 3 minutes at least out of service.For example: in the time that condenser temperature rises to 32 ℃, frequency drops to 50Hz from rotating speed of target 60Hz; In the time that condenser temperature rises to 42 ℃, frequency drops to 40Hz from rotating speed 50Hz; In the time that condenser temperature rises to 47 ℃, frequency drops to 30Hz from rotating speed 40Hz; Run to dry with 30Hz and finish.When in the end the stage is according to 30 Hz operation, also may meet the requirements of limit value with rising/compressor operating electric current I/condenser temperature/compressor exhaust temperature of temperature in cylinder.Can not exceed 70 ℃ such as condenser temperature is the highest, if approached 70 ℃, be that frequency is continued to reduce according to control in the past, reduces condenser temperature.And control mode of the present invention, in the end control the stage, even if compressor is not reduced to the low-limit frequency stage that can turn round, at compressor operating electric current I, condenser temperature, compressor exhaust temperature reaches after limit value, frequency no longer reduces, but by opening blower fan, reduces the load (consulting Fig. 9) of compressor, this process is not necessary, can be good at controlling the work of compressor after variable frequency control is set accurate control of abundant stage.Such compressor variable frequency control mode, both can protect the reliability service of compressor, does not also reduce condensation efficiency, has shortened running time.And because in drying course, with the reduction of running frequency, condensing pressure and evaporating pressure pressure reduction reduce, evaporating pressure rises, and evaporating temperature rises, and simple can make evaporator temperature increase because of evaporating pressure by reduction frequency, the area that reaches the dew point of an air reduces, and reduces condensation efficiency.Evaporator temperature rises also may rise to the normal operating range of compressor.The condenser temperature limit value of above-mentioned control, can be the temperature limit that compressor itself requires, and can be also the temperature limit requiring lower than compressor itself, the temperature value that is beneficial to drying effect of artificial definition.
Embodiment seven
As shown in figure 10, the present embodiment is described evaporimeter antifrost control flow schematic diagram, the described evaporimeter antifrost control stage is raising frequency antifrost, adjust the condition that the direct running frequency to setting of frequency-changeable compressor and frequency-changeable compressor input current or compressor exhaust temperature or condenser temperature do not reach the upper limit, the running frequency of this setting is greater than the final frequency that the control of compressor raising frequency is elevated to.
In the initial stage of drying, because temperature is low, outlet effect when cloth drying is less better, and evaporimeter frosting is also mainly positioned at the incipient stage.So in order to heat up as early as possible and to avoid evaporimeter frosting, the stage can increase following mode and improve drying effect in the early stage.
1, after compressor raising frequency, if temperature sensor perception 1, condenser temperature are lower than 30 ℃ of setting values; 2 or go out a temperature lower than setting value; 3 or evaporator temperature be less than 0 ℃; In the temperature of the easy frosting of evaporimeter, promote the running frequency of compressor, by increased power, move 15 minutes shorter time, make temperature be climbed to compressor to be not easy to occur the stage of frosting.
2, after compressor raising frequency, running frequency when fixing beginning, 30 minutes continuous service stipulated times, until the time finishes or temperature is climbed to compressor and is not easy to occur stage of frosting.
Embodiment in above-described embodiment can further combine or replace; and embodiment is described the preferred embodiments of the present invention; not the spirit and scope of the present invention are limited; do not departing under the prerequisite of design philosophy of the present invention; the various changes and modifications that in this area, professional and technical personnel makes technical scheme of the present invention, all belong to protection scope of the present invention.
Claims (12)
1. the control method of a heat pump clothes dryer frequency-changeable compressor, in clothes drying process, the running frequency of control by stages frequency-changeable compressor, comprise that the control of compressor raising frequency, compressor variable frequency control and drying finish to judge, if detect the drying condition that does not reach setting, be cycled to repeat compressor variable frequency control and drying and finish the process of judging, wherein, the control of compressor raising frequency refers to controls frequency-changeable compressor raising frequency to final frequency stable operation; Compressor variable frequency control refers to that corresponding detected temperatures adjusts the running frequency of frequency-changeable compressor stage by stage.
2. control method according to claim 1, it is characterized in that: after the control of compressor raising frequency, do not reach under the condition of the upper limit meeting frequency-changeable compressor input current or compressor exhaust temperature or condenser temperature, control after time that frequency-changeable compressor sets with the final frequency operation of raising frequency or detected temperatures reach setting value and enter again compressor variable frequency control; Otherwise the condition that reaches the upper limit directly enters compressor variable frequency control.
3. control method according to claim 1, is characterized in that: between the control of compressor raising frequency and compressor variable frequency control, increase the evaporimeter antifrost control stage.
4. control method according to claim 3, is characterized in that: after the evaporimeter antifrost control stage, after the time that control frequency-changeable compressor is set with the final frequency operation of raising frequency or detected temperatures reach setting value, enter compressor variable frequency control again.
5. control method according to claim 1, is characterized in that: described compressor raising frequency control refers to fix the speed raising frequency stage by stage of raising frequency, and per stage raising frequency enters next stage after finishing to stablize regular time again, until final frequency.
6. control method according to claim 1, it is characterized in that: described compressor variable frequency control comprise the frequency reducing antifrost stage and stage by stage control frequently, the frequency reducing antifrost stage referred in the easy frosting of the evaporimeter stage reduces frequency according to detected temperatures control frequency-changeable compressor; Control refers to that per stage determines whether and reaches this stage design temperature according to detected temperatures, selection raising frequency or frequency reducing control frequently stage by stage.
7. control method according to claim 6, it is characterized in that: after frequency-changeable compressor raising frequency finishes, detect condenser temperature go out a temperature or evaporator temperature lower than setting value, or condenser temperature and the poor setting value that is less than of compressor exhaust temperature, or evaporator outlet and inlet temperature differential are while being less than setting value, control frequency-changeable compressor segmentation and reduce frequency, if while being reduced to the minimum operation frequency H1 of setting still in the easy frosting state of evaporimeter, after certain hour, control the final frequency operation being elevated to the control of compressor raising frequency again after frequency-changeable compressor setting-up time out of service.
8. control method according to claim 6, it is characterized in that: control refers to frequently stage by stage, frequency-changeable compressor running frequency is divided into multiple stages, set up corresponding relation with detected temperatures, temperature is higher, and controlling run frequency is lower, in each stage, whether detected temperatures reaches design temperature corresponding to this stage, enters next stage if reach corresponding running frequency adjustment reduction frequency; If do not reach, adjust this stage running frequency and be not less than frequency corresponding to this phase temperature; Compressor control is provided with minimum operation frequency H2 frequently, controls frequency conversion and is not less than this minimum operation frequency.
9. according to the control method described in claim 3 or 4, it is characterized in that: the described evaporimeter antifrost control stage is raising frequency antifrost, adjust the condition that the direct running frequency to setting of frequency-changeable compressor and frequency-changeable compressor input current or compressor exhaust temperature or condenser temperature do not reach the upper limit, the running frequency of this setting is greater than the final frequency that the control of compressor raising frequency is elevated to.
10. according to the arbitrary described control method of claim 1-9, it is characterized in that: described detected temperatures refers to that detecting dryer enters a temperature, or goes out a temperature, or compressor exhaust temperature, or evaporator temperature, or condenser temperature.
11. according to the arbitrary described control method of claim 1-9, it is characterized in that: described final frequency is the target frequency of setting, or final frequency is to work as frequency-changeable compressor input current or compressor exhaust temperature or condenser temperature to reach the corresponding frequency of prescribing a time limit.
12. 1 kinds have as arbitrary in claim 1-11 as described in the heat pump clothes dryer of control method.
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Effective date of registration: 20160711 Address after: 266101 Haier Industrial Park, No. 1, Haier Road, hi tech park, Laoshan District, Shandong, China Applicant after: Qingdao Haier Washing Machine Co., Ltd. Address before: 266101 Haier Industrial Park, No. 1, Haier Road, hi tech park, Laoshan District, Shandong, China Applicant before: haier group corporation Applicant before: Qingdao Haier Washing Machine Co., Ltd. |
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