CN105839376B - Control method for variable-frequency heat pump clothes dryer - Google Patents
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Abstract
The invention relates to a control method of a frequency conversion heat pump clothes dryer, wherein the clothes dryer at least comprises two clothes drying modes: the variable frequency compressor comprises a frequency increasing stage, a frequency maintaining stage and a frequency reducing stage, the frequency of the compressor is gradually reduced from a set target frequency to the end of drying, and the first clothes drying mode is higher than the second clothes drying mode according to the detection temperature corresponding to the gradual and gradual reduction of the set target frequency.
Description
Technical Field
The invention relates to the field of clothes dryers, in particular to a control method of a frequency conversion heat pump clothes dryer.
Background
In daily life, the clothing adopts natural sunning more, and the natural sunning clothes is dry the clothing for a long time, and especially in the rainy season in south, the sunning is difficult to dry thoroughly for many days, so the clothes dryer receives user's favor more and more, but the mode of drying of current clothes dryer is mostly more single, and the consumer has further demand to the humanized mode of operation of clothes dryer, mainly shows in following three aspects, demand one: the clothes dryer requires low noise when used at night during the rest period of people. Requirement two: when the user is urgent, the high requirement of the user on the clothes drying speed needs to be met, and the requirement is three: when the user is not in urgent need for the clothes drying speed, the requirement for the power consumption of the clothes dryer is high, and the requirement for saving electricity of the user needs to be met.
Patent application No. 200710103724.9 discloses a clothes dryer, in particular a clothes dryer having a plurality of drying modes, which is provided with at least three drying modes, namely: a low-noise clothes drying mode, a rare clothes drying mode and a rapid high-temperature clothes drying mode; wherein: the low-noise clothes drying mode is characterized in that low-speed air supply is matched with low heating power or high heating power; the rare clothes drying mode is that low heating power is matched with low-rotation-speed air supply or high-rotation-speed air supply; the mode grade of the rapid clothes drying is that high heating power is matched with high rotating speed air supply. However, the above patent is directed to an electrically heated dryer, and no division of the drying mode is given for the heat pump dryer.
Patent application No. 201380004963.2 discloses an appliance for drying laundry, the appliance comprising a drying air moisture condensing system including a heat pump system having a variable output compressor and at least one drying air variable speed fan for facilitating recirculation of drying air, the appliance being adapted to perform at least one laundry drying cycle in the following modes: at least a first drying mode in which the compressor is driven to a first compressor mode with a compressor power consumption course and/or a compressor rotation speed course and/or a frequency course of a supply current/voltage of the compressor motor and the fan is driven to a first fan mode with a speed course; and at least a second drying mode in which the compressor is driven to a second compressor mode comprising a compressor power consumption course and/or a compressor rotational speed course and/or a frequency course of a supply current/voltage of the compressor motor and the fan is driven to a second fan mode having a speed course, wherein, for at least a part of the drying cycle, the compressor power consumption and/or the compressor rotational speed and/or the frequency of the supply current/voltage of the compressor of the second compressor mode is higher than the compressor power consumption and/or the compressor rotational speed and/or the frequency of the supply current/voltage of the compressor of the first compressor mode and the speed of the second fan mode is higher than the speed of the first fan mode. However, in some of the above drying modes, the compressor cannot work at full load, so that the efficiency is reduced, or in some drying modes, the compressor works in an overload mode, so that the service life of the compressor is influenced.
The invention is therefore set forth in this light.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a control method of a variable-frequency heat pump clothes dryer, which provides a plurality of clothes drying modes for a user to select and has high efficiency of a compressor.
In order to realize the purpose, the invention adopts the following technical scheme: a control method of a variable-frequency heat pump clothes dryer at least comprises two clothes drying modes: a first drying mode in which a high frequency section operation time of the compressor is longer than that of the variable frequency compressor in the second drying mode.
The frequency conversion compressor comprises an up-conversion stage, a frequency maintaining stage and a down-conversion stage, wherein in the up-conversion stage, the frequency of the compressor gradually and stepwise rises to a set target frequency according to time, in the down-conversion stage, the frequency of the compressor gradually and stepwise decreases from the set target frequency to the end of drying according to the detection temperature, and the first clothes drying mode is higher than the second clothes drying mode according to the detection temperature corresponding to the gradual and stepwise decrease of the set target frequency.
And a frequency reduction stage, wherein when the temperature is detected to rise to T11 ℃ in the first drying mode, the frequency of the variable frequency compressor is reduced to f1Hz from the target frequency fnHz, and when the temperature is detected to rise to T21 ℃ in the second drying mode, the frequency of the variable frequency compressor is reduced to f1Hz from the target frequency fnHz, and the T11> T21.
And a frequency reduction stage, wherein when the detection temperature in the first drying mode rises to T12 ℃, the frequency of the variable frequency compressor is reduced from f1Hz to f2Hz until the detection temperature rises to T1m ℃, the frequency of the variable frequency compressor is reduced from f2Hz to fmHz until the drying is finished, when the detection temperature in the second drying mode rises to T22 ℃, the frequency of the variable frequency compressor is reduced from f1Hz to f2Hz until the detection temperature rises to T2m ℃, the frequency of the variable frequency compressor is reduced from f2Hz to fmHz until the drying is finished, and the T12 is greater than T22, and the T1m is greater than T2 m.
The frequency or speed of the fan operation in the first drying mode is higher than or equal to the frequency or speed of the fan operation in the second drying mode.
The clothes dryer further includes a third drying mode in which a high-frequency section operation time of the compressor is shorter than that of the second drying mode, and a frequency or speed of the fan operation in the third drying mode is lower than that of the second drying mode.
And in the frequency reduction stage, the frequency of the compressor is gradually reduced from the set target frequency to the drying end in a stage, and the third drying mode is lower than the second drying mode according to the detection temperature corresponding to the gradual reduction of the set target frequency in a stage.
And in the frequency reducing stage, when the temperature is detected to rise to T31 ℃ in the third drying mode, the frequency of the variable-frequency compressor is reduced to f1Hz from the target frequency fnHz, and when the temperature is detected to rise to T21 ℃ in the second drying mode, the frequency of the variable-frequency compressor is reduced to f1Hz from the target frequency fnHz, wherein T31< T21.
When the detection temperature of the first clothes drying mode rises to T32 ℃, the frequency of the variable frequency compressor is reduced from f1Hz to f2Hz until the detection temperature rises to T3m ℃, the frequency of the variable frequency compressor is reduced from f2Hz to fmHz until the clothes drying is finished, when the detection temperature of the second clothes drying mode rises to T22 ℃, the frequency of the variable frequency compressor is reduced from f1Hz to f2Hz until the detection temperature rises to T2m ℃, the frequency of the variable frequency compressor is reduced from f2Hz to fmHz until the clothes drying is finished, and the T32 is less than T22, and the T3m is less than T2 m.
The detected temperature refers to the detected temperature of the dryer entering a drum, or the temperature of the dryer leaving the drum, or the temperature of the compressor exhaust, or the temperature of an evaporator, or the temperature of a condenser.
After the technical scheme of the invention is adopted, the following beneficial effects are brought:
1. the clothes dryer provides various clothes drying modes, a user can select the clothes drying mode suitable for the user according to the requirement of the user, more choices are provided for the user, one machine is suitable for different people, the universality of the clothes dryer is improved, the various clothes drying modes are provided at the same time, the diversity and the flexibility of the clothes dryer are enhanced, the requirements of people with different requirements and different time periods can be matched, the diversified, high-speed and high-efficiency life rhythm of the people is further adapted, and the humanization of the clothes dryer is enhanced.
2. In a plurality of clothes drying modes of the clothes dryer, the variable frequency compressor is raised to a set target frequency, the clothes drying modes are divided by the operating time length of the set target frequency, namely a high-frequency section, and the compressor in the plurality of clothes drying modes works at full load, so that the efficiency of the compressor is highest, the compressor is utilized to the maximum extent, the working efficiency is low due to low load for a long time, and the service life of the compressor is reduced due to damage to the compressor caused by high load for a long time.
3. The first clothes drying mode in the clothes drying modes can solve the problem of rapid clothes drying and is suitable for people needing rapid clothes drying, the third clothes drying mode can solve the problem of clothes drying noise and is suitable for people who do not worry about clothes drying speed and pay attention to clothes drying silence, and the third clothes drying mode can enable the electricity saving and the clothes drying speed to be matched properly and is suitable for people who do not worry about clothes drying speed and do not worry about the clothes drying noise.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
FIG. 1: the invention relates to a flow chart of a clothes dryer control method
Detailed Description
The invention relates to a control method of a frequency conversion heat pump clothes dryer, wherein the clothes dryer at least comprises two clothes drying modes: a first drying mode in which a high frequency section operation time of the compressor is longer than that of the variable frequency compressor in the second drying mode. The clothes drying speed of the first clothes drying mode is higher than that of the second clothes drying mode, the power consumption of the second clothes drying mode is lower than that of the first clothes drying mode, a user can select the clothes drying mode according to the actual situation, a control button of the clothes drying mode is arranged on the control panel, and the user selects the clothes drying mode through the panel button.
The frequency or speed of the fan operation in the first drying mode is higher than or equal to the frequency or speed of the fan operation in the second drying mode. Preferably, the frequency or the speed of the fan in the first clothes drying mode is higher than that of the fan in the second clothes drying mode, the damp and hot air in the drum is taken away by the circulation of the air and brought into the hot and dry air, so that the moisture in the clothes in the drum is taken away, the higher the frequency or the speed of the fan, the faster the air circulation is promoted, the moisture in the clothes in the drum is taken away more easily, and the clothes drying speed is higher.
The frequency conversion compressor comprises an up-conversion stage, a frequency maintaining stage and a down-conversion stage: after the compressor is started, the operating frequency of the compressor is gradually increased from a low frequency to a maximum operating frequency (a set target frequency), rather than being directly operated at the maximum operating frequency. The frequency of the compressor can also rise in multiple stages, the compressor runs for 0.5 to 3 minutes after rising to each frequency stage and then rises to another frequency stage after running stably, and the rising speed is 1Hz/s to 1Hz/60 s; (e.g., 28-40 Hz/s; 40-50 Hz/s; 50-60 Hz/s; where not directly increasing to the maximum speed is for: the oil that prevents the inside oil of compressor is after the frequency is rotational speed suddenly rise, and the oil mass that gets back to the compressor from the heat exchanger is less than the exhaust oil mass, leads to lubricated not good, increases the wearing and tearing of compressor inner part. The refrigerant is prevented from being incompletely evaporated when the evaporator starts, so that the liquid refrigerant enters the compressor to dilute lubricating oil in the compressor, and poor lubrication is avoided. And in the frequency increasing stage, the running current I of the compressor is monitored, the surface temperature of a condenser reflecting the condensation temperature and the exhaust temperature of the compressor reflecting the internal temperature of the compressor are monitored, if the required limit value is reached, the frequency is maintained, and the frequency does not rise any more even if the frequency does not rise to the target rotating speed.
Meanwhile, the frequency conversion compressors are all raised to a set target frequency, namely the compressors work at full load, so that the efficiency of the compressors is maximized, and the compressors are utilized to the maximum extent.
And when the compressor reaches the set target frequency or the maximum frequency required by the limit value, entering a frequency maintaining stage, and operating according to the set target frequency or the maximum frequency required by the limit value.
When the detected temperature is higher than the set value (for example, the surface temperature of the condenser is higher than 30 ℃), the compressor enters the frequency reduction stage. The frequency of the compressor is adjusted according to the temperature of the inlet cylinder, the temperature of the outlet cylinder, the temperature detected by one or more temperature sensors arranged on the compressor, the evaporator and the condenser or according to the time.
The frequency increasing stage is used for gradually increasing the frequency of the compressor to a set target frequency according to time, the frequency reducing stage is used for establishing a corresponding relation between the frequency change and the detected temperature, the frequency of the compressor is gradually reduced from the set target frequency to the drying end according to the detected temperature, and the first clothes drying mode is higher than the second clothes drying mode according to the detected temperature corresponding to the gradual and gradual reduction of the set target frequency. Thus, the first drying mode is lowered later than the second drying mode from the set target frequency, so the first drying mode is moved out of the high frequency stage operation later, and thus the first drying mode is operated at the set target frequency for a longer time than the second drying mode, i.e., the high frequency stage operation time of the compressor in the first drying mode is longer than that in the second drying mode. The frequency of the compressor is high, the temperature for heating the gas entering the cylinder is high, the high-frequency section operation time is long, the high-temperature maintaining time of the gas in the cylinder is long, the high-frequency section operation time is long, the clothes drying speed is high, the corresponding relation is established between the frequency change of the frequency raising stage and the detected temperature under the condition, and the first clothes drying mode and the second clothes drying mode can be the same or different.
Specifically, the method comprises the following steps: the frequency increasing stage, the compressor frequency gradually increases to a set target frequency according to time, the frequency reducing stage, when the detection temperature in the first clothes drying mode rises to T11 ℃, the frequency of the inverter compressor is reduced from the target frequency fnHz to f1Hz, when the detection temperature rises to T12 ℃, the frequency of the inverter compressor is reduced from f1Hz to f2Hz until the detection temperature rises to T1m ℃, the frequency of the inverter compressor is reduced from f2Hz to fmHz until the clothes drying is finished, when the detection temperature in the second clothes drying mode rises to T21 ℃, the frequency of the inverter compressor is reduced from the target frequency fnHz to f3Hz, when the detection temperature rises to T22 ℃, the frequency of the inverter compressor is reduced from f1Hz to f2Hz 7372 until the detection temperature rises to T2m ℃, the frequency of the inverter compressor is reduced from f2Hz to fmHz until the clothes drying is finished, the T11> T21, T6T 22, and T1m > T m.
The detected temperature refers to the detected temperature of the dryer entering a drum, or the temperature of the dryer leaving the drum, or the temperature of the compressor exhaust, or the temperature of an evaporator, or the temperature of a condenser.
Taking the surface temperature of the condenser as an example: the frequency change of each stage and the surface temperature of the condenser establish a corresponding relation, and the higher the surface temperature of the condenser is, the lower the operation frequency section is. When the surface of the condenser is raised to 32 ℃ in the second clothes drying mode, the frequency is reduced to 50Hz from the target rotating speed of 60 Hz; when the condenser surface is raised to 42 ℃, the frequency is reduced from 50Hz to 40 Hz; when the condenser surface was raised to 47 ℃, the frequency dropped from 40Hz to 30 Hz; and operating at 30Hz until the drying is finished. When the surface of the condenser is raised to 42 ℃ in the first clothes drying mode, the frequency is reduced to 50Hz from the target rotating speed of 60 Hz; when the condenser surface is raised to 52 ℃, the frequency is reduced from 50Hz to 40 Hz; when the condenser surface rises to 57 ℃, the frequency drops from 40Hz to 30 Hz; and operating at 30Hz until the drying is finished.
The clothes dryer can also comprise a third clothes drying mode, the high-frequency section running time of the compressor in the third clothes drying mode is shorter than that of the compressor in the second clothes drying mode, the clothes drying speed of the third clothes drying mode is slower than that of the second clothes drying mode, but the noise of the third clothes drying mode is lower than that of the second clothes drying mode, a user can select the clothes drying mode according to the actual situation, a control button of the clothes drying mode is arranged on the control panel, and the user can select the clothes drying mode through the panel button. The frequency or speed of the fan operation in the third drying mode is lower than the frequency or speed of the fan operation in the second drying mode. The noise can be further reduced.
The frequency increasing stage is used for gradually increasing the frequency of the compressor to a set target frequency according to time, the frequency reducing stage is used for establishing a corresponding relation between the frequency change and the detected temperature, the frequency of the compressor is gradually reduced from the set target frequency to the end of drying according to the detected temperature, and the third drying mode of the detected temperature corresponding to each stage is lower than the second drying mode. The third drying mode leaves the set target frequency earlier than the second drying mode, so the third drying mode leaves the set target frequency earlier, i.e., the operation time of the high frequency section of the compressor in the third drying mode is shorter than that of the compressor in the second drying mode, and the higher the frequency of the compressor is, the louder the noise is, and the short operation time of the high frequency section in the third drying mode, so the noise is relatively low.
Specifically, the method comprises the following steps: in the frequency reducing stage, when the detection temperature in the third drying mode rises to T33 ℃, the frequency of the variable-frequency compressor is reduced from a target frequency fnHz to f3Hz, when the detection temperature rises to T34 ℃, the frequency of the variable-frequency compressor is reduced from f3Hz to f4Hz until the detection temperature rises to T3m ℃, the frequency of the variable-frequency compressor is reduced from f4Hz to fmHz until the drying is finished, when the detection temperature in the second drying mode rises to T23 ℃, the frequency of the variable-frequency compressor is reduced from the target frequency fnHz to f3Hz, when the detection temperature rises to T24 ℃, the frequency of the variable-frequency compressor is reduced from f3Hz to f4Hz until the detection temperature rises to T2m ℃, the frequency of the variable-frequency compressor is reduced from f4Hz to fmHz until the drying is finished, the T33 is less than T23, T34< T24, and T3m < T2 m.
Taking the surface temperature of the condenser as an example: the frequency change of each stage and the surface temperature of the condenser establish a corresponding relation, and the higher the surface temperature of the condenser is, the lower the operation frequency section is. When the surface of the condenser is raised to 32 ℃ in the second clothes drying mode, the frequency is reduced to 50Hz from the target rotating speed of 60 Hz; when the condenser surface is raised to 42 ℃, the frequency is reduced from 50Hz to 40 Hz; when the condenser surface was raised to 47 ℃, the frequency dropped from 40Hz to 30 Hz; and operating at 30Hz until the drying is finished. When the surface of the condenser is raised to 27 ℃ in the third clothes drying mode, the frequency is reduced to 50Hz from the target rotating speed of 60 Hz; when the condenser surface is raised to 37 ℃, the frequency is reduced from 50Hz to 40 Hz; when the condenser surface rises to 42 ℃, the frequency drops from 40Hz to 30 Hz; and operating at 30Hz until the drying is finished.
Therefore: some users need to quickly dry clothes when worried about, noise and power consumption do not need to be considered, the speed is the most important standard, and the first clothes drying mode, namely the quick mode, can be selected at the moment, so that the needed clothes can be quickly dried; some users plan to wear the clothes the next day after washing the clothes evening, so as long as evening with the clothes dry can, the time of evening is very long, but still have a rest evening, do not want the clothes dryer to disturb the rest, need silence dry clothing this moment, need not consider speed and power consumptive, the silence is the most important standard, so select third dry clothing mode promptly silence mode, can reduce the noise to minimum, both can dry the clothes and also can reduce the noise and avoid disturbing the rest. If the user is not particularly worried about drying the clothes and is not afraid of noise disturbing rest, the second clothes drying mode can be selected, so that the electricity saving and the clothes drying speed are matched properly.
The clothes dryer provides various clothes drying modes, a user can select the clothes drying mode suitable for the user according to the requirement of the user, more choices are provided for the user, one machine is suitable for different people, the universality of the clothes dryer is improved, the various clothes drying modes are provided at the same time, the diversity and the flexibility of the clothes dryer are enhanced, the requirements of people with different requirements and different time periods can be matched, the diversified, high-speed and high-efficiency life rhythm of the people is further adapted, and the humanization of the clothes dryer is enhanced.
Meanwhile, in a plurality of clothes drying modes of the clothes dryer, the variable frequency compressor is raised to a set target frequency, the clothes drying modes are divided by the set target frequency, namely the running time length of a high-frequency section, and the compressor in the plurality of clothes drying modes works at full load, so that the efficiency of the compressor is highest, the compressor is utilized to the maximum extent, the long-time low-load working efficiency is low, and the service life of the compressor is shortened due to the fact that the compressor is not damaged by the long-time high-load working.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many variations and modifications can be made without departing from the principle of the present invention, which should also be regarded as the protection scope of the present invention.
Claims (17)
1. A control method of a frequency conversion heat pump clothes dryer is characterized in that: the dryer includes at least two drying modes: a first drying mode in which a high frequency section operation time of a compressor is longer than a high frequency section operation time of a variable frequency compressor in a second drying mode;
the frequency conversion compressor comprises an up-conversion stage, a frequency maintaining stage and a down-conversion stage, wherein in the up-conversion stage, the frequency of the compressor gradually and stepwise rises to a set target frequency according to time, in the down-conversion stage, the frequency of the compressor gradually and stepwise decreases from the set target frequency to the end of drying according to the detection temperature, and the first clothes drying mode is higher than the second clothes drying mode according to the detection temperature corresponding to the gradual and stepwise decrease of the set target frequency.
2. The method of claim 1 for controlling a variable frequency heat pump clothes dryer, wherein: and a frequency reduction stage, wherein when the temperature is detected to rise to T11 ℃ in the first drying mode, the frequency of the variable frequency compressor is reduced to f1Hz from the target frequency fnHz, and when the temperature is detected to rise to T21 ℃ in the second drying mode, the frequency of the variable frequency compressor is reduced to f1Hz from the target frequency fnHz, and the T11> T21.
3. The method of claim 2 for controlling a variable frequency heat pump clothes dryer, wherein: and a frequency reduction stage, wherein when the detection temperature in the first drying mode rises to T12 ℃, the frequency of the variable frequency compressor is reduced from f1Hz to f2Hz until the detection temperature rises to T1m ℃, the frequency of the variable frequency compressor is reduced from f2Hz to fmHz until the drying is finished, when the detection temperature in the second drying mode rises to T22 ℃, the frequency of the variable frequency compressor is reduced from f1Hz to f2Hz until the detection temperature rises to T2m ℃, the frequency of the variable frequency compressor is reduced from f2Hz to fmHz until the drying is finished, and the T12 is greater than T22, and the T1m is greater than T2 m.
4. The method of controlling a variable frequency heat pump clothes dryer according to any one of claims 1-3, wherein: the frequency or speed of the fan operation in the first drying mode is higher than or equal to the frequency or speed of the fan operation in the second drying mode.
5. The method of controlling a variable frequency heat pump clothes dryer according to any one of claims 1-3, wherein: the clothes dryer further includes a third drying mode in which a high-frequency section operation time of the compressor is shorter than that of the second drying mode, and a frequency or speed of the fan operation in the third drying mode is lower than that of the second drying mode.
6. The method of claim 4 for controlling a variable frequency heat pump clothes dryer, wherein: the clothes dryer further includes a third drying mode in which a high-frequency section operation time of the compressor is shorter than that of the second drying mode, and a frequency or speed of the fan operation in the third drying mode is lower than that of the second drying mode.
7. The control method of the variable frequency heat pump clothes dryer according to any one of claims 1-3 and 6, characterized in that: and in the frequency reduction stage, the frequency of the compressor is gradually reduced from the set target frequency to the drying end in a stage, and the third drying mode is lower than the second drying mode according to the detection temperature corresponding to the gradual reduction of the set target frequency in a stage.
8. The method of claim 4 for controlling a variable frequency heat pump clothes dryer, wherein: and in the frequency reduction stage, the frequency of the compressor is gradually reduced from the set target frequency to the drying end in a stage, and the third drying mode is lower than the second drying mode according to the detection temperature corresponding to the gradual reduction of the set target frequency in a stage.
9. The method of claim 5 for controlling a variable frequency heat pump clothes dryer, wherein: and in the frequency reduction stage, the frequency of the compressor is gradually reduced from the set target frequency to the drying end in a stage, and the third drying mode is lower than the second drying mode according to the detection temperature corresponding to the gradual reduction of the set target frequency in a stage.
10. The control method of the inverter heat pump clothes dryer according to any one of claims 1-3, 6 and 8-9, wherein: and in the frequency reducing stage, when the temperature is detected to rise to T31 ℃ in the third drying mode, the frequency of the variable-frequency compressor is reduced to f1Hz from the target frequency fnHz, and when the temperature is detected to rise to T21 ℃ in the second drying mode, the frequency of the variable-frequency compressor is reduced to f1Hz from the target frequency fnHz, wherein T31< T21.
11. The method of claim 4 for controlling a variable frequency heat pump clothes dryer, wherein: and in the frequency reducing stage, when the temperature is detected to rise to T31 ℃ in the third drying mode, the frequency of the variable-frequency compressor is reduced to f1Hz from the target frequency fnHz, and when the temperature is detected to rise to T21 ℃ in the second drying mode, the frequency of the variable-frequency compressor is reduced to f1Hz from the target frequency fnHz, wherein T31< T21.
12. The method of claim 5 for controlling a variable frequency heat pump clothes dryer, wherein: and in the frequency reducing stage, when the temperature is detected to rise to T31 ℃ in the third drying mode, the frequency of the variable-frequency compressor is reduced to f1Hz from the target frequency fnHz, and when the temperature is detected to rise to T21 ℃ in the second drying mode, the frequency of the variable-frequency compressor is reduced to f1Hz from the target frequency fnHz, wherein T31< T21.
13. The method of claim 7 for controlling a variable frequency heat pump clothes dryer, wherein: and in the frequency reducing stage, when the temperature is detected to rise to T31 ℃ in the third drying mode, the frequency of the variable-frequency compressor is reduced to f1Hz from the target frequency fnHz, and when the temperature is detected to rise to T21 ℃ in the second drying mode, the frequency of the variable-frequency compressor is reduced to f1Hz from the target frequency fnHz, wherein T31< T21.
14. The method of claim 10 for controlling an inverter heat pump dryer, wherein: when the detection temperature of the first clothes drying mode rises to T32 ℃, the frequency of the variable frequency compressor is reduced from f1Hz to f2Hz until the detection temperature rises to T3m ℃, the frequency of the variable frequency compressor is reduced from f2Hz to fmHz until the clothes drying is finished, when the detection temperature of the second clothes drying mode rises to T22 ℃, the frequency of the variable frequency compressor is reduced from f1Hz to f2Hz until the detection temperature rises to T2m ℃, the frequency of the variable frequency compressor is reduced from f2Hz to fmHz until the clothes drying is finished, and the T32 is less than T22, and the T3m is less than T2 m.
15. The control method of the inverter heat pump clothes dryer according to any one of claims 1-3, 8-9 and 11-13, wherein: the detected temperature refers to the detected temperature of the dryer entering a drum, or the temperature of the dryer leaving the drum, or the temperature of the compressor exhaust, or the temperature of an evaporator, or the temperature of a condenser.
16. The method of claim 7 for controlling a variable frequency heat pump clothes dryer, wherein: the detected temperature refers to the detected temperature of the dryer entering a drum, or the temperature of the dryer leaving the drum, or the temperature of the compressor exhaust, or the temperature of an evaporator, or the temperature of a condenser.
17. The method of claim 10 for controlling an inverter heat pump dryer, wherein: the detected temperature refers to the detected temperature of the dryer entering a drum, or the temperature of the dryer leaving the drum, or the temperature of the compressor exhaust, or the temperature of an evaporator, or the temperature of a condenser.
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