CN115976806A - Clothes dryer and control system and method thereof - Google Patents
Clothes dryer and control system and method thereof Download PDFInfo
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Abstract
The invention discloses a clothes dryer and a control system and a control method thereof, wherein the method comprises the steps of acquiring a first moisture content and a second moisture content, wherein the first moisture content is the moisture content of air before entering a clothes barrel body or the moisture content of air after passing through an evaporator; the second moisture content is the moisture content of the air after passing through the clothes barrel body or the moisture content of the air before entering the evaporator; and controlling the working state of the clothes dryer according to the first moisture content and the second moisture content, so that the problem of over-drying when a large load is dried but the internal load is not dried is avoided, whether the load is dried or not is judged efficiently and accurately, and the user experience is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of household appliances, in particular to a clothes dryer and a control system and method thereof.
Background
With the development of society, the living standard of people is gradually improved, and people pay more attention to the aspect of clothes care. In humid and cold regions, laundry dryers are receiving increasing attention.
At present, a clothes dryer generally adopts a double-metal-strip humidity sensor to judge drying, but because the sensor can only contact part of load, when a large load is dried, the condition that the internal load is not dried exists, and the experience of a user can be influenced. Some merchants cause the problem of overbaking by increasing the drying time, and increase the power consumption. How to efficiently and accurately judge whether the load is dried becomes the problem to be solved urgently at present.
Disclosure of Invention
The invention provides a clothes dryer and a control system and method thereof, which aim to efficiently and accurately judge whether a load is dried or not and improve user experience.
To achieve the above object, a first aspect of the present invention provides a control method of a clothes dryer, including:
acquiring a first moisture content and a second moisture content, wherein the first moisture content is the moisture content of air before entering a drum of the clothes or the moisture content of air after passing through an evaporator; the second moisture content is the moisture content of the air after passing through the clothes barrel body or the moisture content of the air before entering the evaporator;
controlling an operating state of the laundry dryer according to the first moisture content and the second moisture content.
According to one embodiment of the present invention, said controlling the operating state of said laundry dryer according to said first moisture content and said second moisture content comprises:
calculating a moisture content difference from the first moisture content and the second moisture content;
calculating the variation of the moisture content difference in unit time according to the moisture content difference;
and when the variation is a negative value and the moisture content difference at the current moment is smaller than a preset moisture content difference, controlling the clothes dryer to stop working.
According to one embodiment of the invention said calculating a moisture content difference value from said first moisture content and said second moisture content comprises:
the moisture content difference is the difference between the second moisture content and the first moisture content.
According to one embodiment of the invention, before acquiring the first moisture content and the second moisture content comprises:
acquiring a first temperature and a first humidity;
acquiring a second temperature and a second humidity;
determining a first moisture content from the first temperature and the first humidity, and determining a second moisture content from the second temperature and the second humidity.
According to an embodiment of the invention, said determining a first moisture content from said first temperature and said first humidity comprises:
determining a first saturated water vapor partial pressure according to the first temperature;
determining a first actual partial pressure of water vapor according to the first saturated partial pressure of water vapor and the first humidity;
determining the first moisture content from the first actual partial pressure of water vapour;
said determining a second moisture content from said second temperature and said second humidity comprises:
determining a second saturated water vapor partial pressure according to the second temperature;
determining a second actual partial pressure of water vapor according to the second saturated partial pressure of water vapor and the second humidity;
determining the second moisture content from the second actual partial pressure of water vapour.
According to an embodiment of the invention, the first temperature is a temperature at an air inlet of the laundry drum, the first humidity is a humidity at the air inlet of the laundry drum, the second temperature is a temperature at an air outlet of the laundry drum, and the second humidity is a humidity at the air outlet of the laundry drum.
According to an embodiment of the invention, the first temperature is a temperature at the evaporator air outlet, the first humidity is a humidity at the evaporator air outlet, the second temperature is a temperature at the evaporator air inlet, and the second humidity is a humidity at the evaporator air inlet.
In order to achieve the above object, a clothes dryer control system according to a second aspect of the present invention includes: the heat pump component comprises an evaporator, a condenser, a filter screen, a compressor, an electronic expansion valve, a fan and an air duct, wherein the air duct comprises a first air duct section and a second air duct section, an air outlet of the condenser is connected with an air inlet of the clothes barrel body through the first air duct section, and an air inlet of the evaporator is connected with an air outlet of the clothes barrel body through the second air duct section; the fan is positioned at the first air duct section; the filter screen is positioned at the second air duct section; the liquid inlet of the condenser is connected with the liquid outlet of the evaporator through the compressor; the liquid outlet of the condenser is connected with the liquid inlet of the evaporator through the electronic expansion valve;
further comprising:
a controller for acquiring a first moisture content and a second moisture content and controlling an operating state of the laundry dryer according to the first moisture content and the second moisture content; the first moisture content is a moisture content of the air before entering the laundry tub or a moisture content of the air after passing through the evaporator; the second moisture content is a moisture content of the air after passing through the tub of the laundry or a moisture content of the air before entering the evaporator.
According to an embodiment of the present invention, the control system of the laundry dryer further comprises:
the first humidity sensor and the second humidity sensor are respectively connected with the controller, and the first humidity sensor is positioned at the joint of the first air channel section and the clothes barrel body; the second humidity sensor is positioned at the joint of the second air channel section and the clothes barrel body; or, the first humidity sensor is positioned at the air outlet of the evaporator, and the second humidity sensor is positioned at the air inlet of the evaporator.
To achieve the above object, a clothes dryer is provided in an embodiment of a third aspect of the present invention, which includes the control system of the clothes dryer as described above.
According to the embodiment of the invention, the clothes dryer and the control system and method thereof are provided, wherein the method comprises the steps of obtaining a first moisture content and a second moisture content, wherein the first moisture content is the moisture content of air before entering a clothes barrel body or the moisture content of air after passing through an evaporator; the second moisture content is a moisture content of the air after passing through the drum body of the laundry or a moisture content of the air before entering the evaporator; and controlling the working state of the clothes dryer according to the first moisture content and the second moisture content, so that the problem of over-drying when a large load is dried but the internal load is not dried is avoided, whether the load is dried or not is judged efficiently and accurately, and the user experience is improved.
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Fig. 1 is a flowchart of a control method of a laundry dryer according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a control method of a laundry dryer according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a control method of a laundry dryer according to another embodiment of the present invention;
fig. 4 is a flowchart of a control method of a laundry dryer according to still another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a control system of a clothes dryer according to an embodiment of the present invention;
fig. 6 is a block diagram schematically illustrating a laundry dryer according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings, not all of them.
Fig. 1 is a flowchart of a control method of a laundry dryer according to an embodiment of the present invention. As shown in fig. 1, the control method of the laundry dryer includes:
s101, acquiring a first moisture content and a second moisture content, wherein the first moisture content is the moisture content of air before entering a drum body of the clothes or the moisture content of air after passing through an evaporator; the second moisture content is a moisture content of the air after passing through the drum body of the laundry or a moisture content of the air before entering the evaporator;
s102, controlling the working state of the laundry dryer according to the first moisture content and the second moisture content.
It should be noted that, in the current laundry dryer, the bi-metal strip humidity sensor is basically used to directly test whether the laundry is dried, so that when the laundry is a large piece such as a quilt cover, a down jacket, etc., the exterior of the quilt cover or the down jacket may be already dried, but the bi-metal strip humidity sensor detects that the interior of the quilt cover or the down jacket is not yet dried, the laundry dryer may continue to dry, resulting in over-drying, increasing power consumption, and the over-drying affects the laundry, so that the user experience is reduced. The control method of the clothes dryer provided by the embodiment of the invention judges whether the clothes are dried by acquiring the moisture content of the air before the air enters the clothes barrel, or the moisture content of the air after the air passes through the evaporator, or the moisture content of the air after the air passes through the clothes barrel, or the moisture content of the air before the air enters the evaporator, and because the moisture content of the air is a uniform total value for judging whether the clothes are dried or not relative to the dry air, when the moisture content of the air meets a certain condition, the clothes can be judged to be dried, even if the local part inside the clothes is not dried (slightly moist, the local moisture content is higher), the clothes can be judged to be dried (the whole moisture content is lower), and further, whether the clothes are dried or not is judged directly according to the moisture content of the air, the condition that the local part is dried but not dried can not be avoided, and the problem of over-drying can not occur, so that the clothes can not be damaged due to over-drying, and the experience of users can be improved.
According to an embodiment of the present invention, as shown in fig. 2, said controlling the operation state of said laundry dryer according to said first moisture content and said second moisture content at step S102 comprises:
s1021, calculating a moisture content difference value according to the first moisture content and the second moisture content;
according to one embodiment of the invention said calculating a moisture content difference value from said first moisture content and said second moisture content comprises:
the moisture content difference is the difference between the second moisture content and the first moisture content.
Taking the first moisture content as d1 and the second moisture content as d2 as an example, the moisture content difference Δ d = d2-d1.
It will be understood that the first moisture content is the moisture content of the air before entering the tub of the laundry, or the moisture content of the air after passing through the evaporator; the second moisture content is the moisture content of the air after passing through the clothes barrel body or the moisture content of the air before entering the evaporator; whether the laundry is dried or not is judged by the moisture content of the air before and after passing through the laundry tub or the moisture content of the air before and after passing through the evaporator.
S1022, calculating the variation of the moisture content difference in unit time according to the moisture content difference;
the unit time in step S1022 may be set according to the storage space and the calculation capability of the clothes dryer, for example, the unit time may be 1s,2s, or 5S, and the shorter the time length of the unit time, the higher the required storage space and the calculation capability of the clothes dryer, and conversely, the longer the time length of the unit time, the lower the required storage space and the calculation capability of the clothes dryer.
When the unit time is 5s, it can be understood that the moisture content difference Δ d (0 s) = d2 (0 s) -d1 (0 s) is obtained at 0s, then the moisture content difference Δ d (5 s) = d2 (5 s) -d1 (5 s) is obtained at 5s, then the moisture content difference has a variation k = [. DELTA.d (5 s) -. DELTA.d (0 s) ]/(5 s-0 s) at 5s, then the moisture content difference Δ d (10 s) = d2 (10 s) -d1 (10 s) is obtained at 10s, then the variation of the moisture content difference has a variation k = [. DELTA.d (10 s) -. DELTA.d (5 s) ]/(10 s-5 s) at 5 s), and so on. Similarly, when the unit time is 2s, it can be understood that the moisture content difference Δ d (0 s) = d2 (0 s) -d1 (0 s) is acquired at 0s, then the moisture content difference Δ d (2 s) = d2 (2 s) -d1 (2 s) is acquired at 2s, then the amount of change in the moisture content difference per unit time 2s is k = [ - Δ d (2 s) - [ Δ d (0 s) ]/(2 s-0 s), then the moisture content difference Δ d (4 s) = d2 (4 s) -d1 (4 s) is acquired at 4s, then the amount of change in the moisture content difference per unit time 2s is k = [ = Δ d (4 s) - [ d (2 s) ]/(4 s-2 s), and so on. When the unit time is other values, refer to the above calculation process of 5s or 2 s.
And S1023, when the variation is a negative value and the moisture content difference value at the current moment is smaller than a preset moisture content difference value, controlling the clothes dryer to stop working.
That is, when the variation k has a negative value, that is, when the moisture content difference at the current time is smaller than the moisture content difference at the previous time, it indicates that the laundry is in a state of being dried soon, and further, when the moisture content difference at the current time is smaller than the preset moisture content difference, that is, the moisture content difference before and after passing through the tub of the laundry is smaller than the preset moisture content difference, it indicates that the laundry has been dried, and at this time, the laundry dryer may be controlled to stop operating. The preset moisture content difference value may be set according to actual conditions, and is not specifically limited herein.
According to one embodiment of the present invention, before the step S101 of acquiring the first moisture content and the second moisture content, the method comprises:
acquiring a first temperature and a first humidity;
acquiring a second temperature and a second humidity;
determining a first moisture content from the first temperature and the first humidity, and determining a second moisture content from the second temperature and the second humidity.
It is understood that the first moisture content may be determined by the first temperature and the first humidity. Wherein, first temperature is the temperature of clothing staving air inlet department, first humidity does the humidity of clothing staving air inlet department, first temperature does the temperature of evaporimeter air outlet department, first humidity does evaporimeter air outlet department humidity, and the in-process of the actual operation can set up first humidity transducer in the air inlet department of clothing staving or the air outlet department of evaporimeter, through first humidity transducer real-time detection clothing staving air inlet department or the first temperature and the first humidity of the air outlet department of evaporimeter.
Likewise, the second moisture content may be determined by a second temperature and a second humidity. The second temperature is the temperature at the air outlet of the clothes barrel body, and the second humidity is the humidity at the air outlet of the clothes barrel body. The second temperature is the temperature at the air inlet of the evaporator, and the second humidity is the humidity at the air inlet of the evaporator. In the actual operation process, a second humidity sensor can be arranged at the air outlet of the clothes barrel body or the air inlet of the evaporator, and the second temperature and the second humidity at the air outlet of the clothes barrel body or the air inlet of the evaporator are detected in real time through the second humidity sensor. The temperature and humidity at the air outlet and the air inlet of the clothes barrel body can directly reflect the dryness and wetness degree of the clothes, and the temperature and humidity data obtained in the way is more beneficial to judging whether the drying of the clothes is finished or not, and is a preferred embodiment of the invention. If the temperature and humidity data at the air outlet and the air inlet of the clothes barrel body are difficult to obtain, the temperature and humidity data at the air inlet and the air outlet of the evaporator can also be obtained to judge whether the drying of the clothes is finished.
According to one embodiment of the present invention, said determining a first moisture content from said first temperature and said first humidity comprises:
determining a first saturated water vapor partial pressure according to the first temperature;
determining a first actual partial pressure of water vapor according to the first saturated partial pressure of water vapor and the first humidity;
determining the first moisture content from the first actual partial pressure of water vapour;
said determining a second moisture content from said second temperature and said second humidity comprises:
determining a second saturated water vapor partial pressure according to the second temperature;
determining a second actual partial pressure of water vapor according to the second saturated partial pressure of water vapor and the second humidity;
determining the second moisture content from the second actual partial pressure of water vapour.
The saturated water vapor partial pressure P is determined based on the temperature T ws The formula of (1) is as follows:
when the temperature T is-100 ℃ to 0 ℃,
wherein, C 1 ＝-5.6745359E+03；C 2 ＝-6.3925247E+00；C 3 ＝-9.6778430E-03；C 4 ＝6.2215701E-07；C 5 ＝2.0747825E-09；C 6 ＝-9.4840240E-13；C 7 ＝4.1635019E+00。
When the temperature T is between 0 and 200 ℃,
wherein, C 8 ＝-5.8002206E+03；C 9 ＝1.3914993E+00；C 10 ＝-4.8640239E-02；C 11 ＝4.1764768E-05；C 12 ＝-1.4452093E-08；C 13 ＝6.5459673E+00。
When the saturated water vapor partial pressure P is obtained ws Then, the partial pressure P of saturated water vapor can be determined ws Calculating the actual partial pressure P of water vapor by the formula of the sum of humidity phi (unit percent) w (unit Pa). The formula is as follows: p w ＝100*Φ*P ws 。
When calculating to obtain the actual partial pressure P of the water vapor w Then, the actual partial pressure P of the water vapor can be determined w And obtaining the moisture content W (Kg/Kg dry air) of the air by a formula between the measured atmospheric pressure p and the moisture content W of the air.
The concrete formula is as follows:
based on this, after the first temperature T1 is acquired, the first saturated water vapor partial pressure P may be determined from the first temperature T1 ws1 (ii) a Then according to the first saturated water vapor partial pressure P ws1 And the first humidity phi 1 obtains a first actual partial pressure P of water vapor w1 Finally, the first moisture content W1 is acquired. Likewise, after the second temperature T2 is acquired, the second saturated water vapor partial pressure P may be determined based on the second temperature T2 ws2 (ii) a Then according to a second saturated water vapor partial pressure P ws2 And a second humidity phi 2 to obtain a second actual partial pressure P of water vapor w2 Finally, the second moisture content W2 is acquired.
After the first moisture content W1 and the second moisture content W2 are determined, a moisture content difference value may be calculated from the first moisture content and the second moisture content, and the amount of change in the moisture content difference value per unit time may be calculated from the moisture content difference value; so that the laundry dryer is controlled to stop operating when the variation is a negative value and the moisture content difference value at the present time is less than a preset moisture content difference value. Otherwise, the clothes dryer is continuously controlled to continuously work.
It should be noted that only when the variation is a negative value, the moisture content difference at the current time is determined to be smaller than the preset moisture content difference, so that the complex procedure steps and the waste of computing resources are avoided.
In an embodiment of the present invention, as shown in fig. 3, for example, to obtain the temperature and humidity of the air inlet and outlet of the clothes bucket, the control method includes the following steps:
s201, acquiring the temperature and the humidity at an air inlet of a clothes barrel body;
s202, acquiring the temperature and the humidity at the air outlet of the clothes barrel body;
s203, acquiring moisture content at the air inlet of the clothes barrel according to the temperature and the humidity at the air inlet of the clothes barrel;
s204, acquiring moisture content at the air outlet of the clothes barrel according to the temperature and the humidity at the air outlet of the clothes barrel;
s205, acquiring a moisture content difference value between the moisture content at the air outlet of the clothes barrel body and the moisture content at the air inlet of the clothes barrel body;
s206, after unit time is spaced, repeating the steps S201 to S205, and further acquiring the variation of the moisture content difference in unit time;
s207, when the variable quantity is negative, judging whether the moisture content difference value at the current moment is smaller than a preset moisture content difference value, if so, finishing drying; if not, drying is continued.
S208, when the variation is positive, the drying is continued until when the variation is negative, the previous step S207 is performed.
In another embodiment of the present invention, as shown in fig. 4, for example, taking the temperature and humidity of the air inlet/outlet of the evaporator as an example, the control method includes the following steps:
s301, acquiring the temperature and the humidity at an air inlet of an evaporator;
s302, acquiring the temperature and the humidity at the air outlet of the evaporator;
s303, acquiring the moisture content at the air inlet of the evaporator according to the temperature and the humidity at the air inlet of the evaporator;
s304, acquiring moisture content at the air outlet of the evaporator according to the temperature and the humidity at the air outlet of the evaporator;
s305, acquiring a moisture content difference value between the moisture content at the air inlet of the evaporator and the moisture content at the air outlet of the evaporator;
s306, after unit time, repeating the steps S301 to S305, and further acquiring the variation of the moisture content difference value in the unit time;
s307, when the variation is negative, judging whether the moisture content difference value at the current moment is smaller than a preset moisture content difference value, if so, finishing drying; if not, drying is continued.
S308, when the variation is positive, the drying is continued until when the variation is negative, the previous step S307 is performed.
In summary, according to the control method for drying laundry provided by the embodiment of the present invention, whether drying of laundry is completed is determined by using the first moisture content and the second moisture content, so that a problem of over-drying when a large load is dried but an internal load is not dried is avoided, and thus whether the load is dried is efficiently and accurately determined, and user experience is improved.
Fig. 5 is a schematic structural diagram of a control system of a clothes dryer according to an embodiment of the present invention. As shown in fig. 5, the control system 100 of the laundry dryer includes: the clothes drying device comprises a clothes barrel body 1 and a heat pump component, wherein the heat pump component comprises an evaporator 5, a condenser 4, a filter screen 6, a compressor 8, an electronic expansion valve 7, a fan 2 and an air channel, the air channel comprises a first air channel section 01 and a second air channel section 02, an air outlet of the condenser 4 is connected with an air inlet of the clothes barrel body 1 through the first air channel section 01, and an air inlet of the evaporator 5 is connected with an air outlet of the clothes barrel body 1 through the second air channel section 02; the fan 2 is positioned at the first air duct section 01; the filter screen 6 is positioned at the second air duct section 02; a liquid inlet of the condenser 4 is connected with a liquid outlet of the evaporator 5 through the compressor 8; the liquid outlet of the condenser 4 is connected with the liquid inlet of the evaporator 5 through the electronic expansion valve 7;
further comprising:
a controller (not shown) for obtaining a first moisture content and a second moisture content and controlling an operating state of said laundry dryer according to said first moisture content and said second moisture content; the first moisture content is a moisture content before the air enters the laundry tub 1, or a moisture content after the air passes through the evaporator 5; the second moisture content is a moisture content of the air after passing through the laundry tub 1, or a moisture content of the air before entering the evaporator 5.
It is understood that, on the air side circulation: air is heated by the condenser 4, enters the clothes barrel body 1 through the fan 2, fully exchanges heat with clothes in the clothes barrel body 1, is removed of flock through the filter screen 6, is cooled and dehumidified by the evaporator 5, and then enters the condenser 4 to complete circulation. Refrigerant side: the high-temperature refrigerant discharged from the compressor 8 releases heat through the condenser 4, enters the evaporator 5 through the electronic expansion valve 7, absorbs heat in the evaporator 5, and returns to the compressor 8 again.
Wherein the controller can acquire the moisture content of the air before entering the laundry tub 1 and the moisture content of the air after passing through the laundry tub 1, and control the operation state of the laundry dryer through the two moisture content parameters. Alternatively, the moisture content of the air after passing through the evaporator 5 can be obtained, and the moisture content of the air before entering the evaporator 5 can be used to control the operation state of the laundry dryer by the two moisture content parameters. Specifically, how to obtain the moisture content is stated in the method section, please refer to the corresponding content of the method section, which is not described herein again.
According to an embodiment of the present invention, as shown in fig. 5, the control system 100 of the laundry dryer further includes:
a first humidity sensor 10 and a second humidity sensor 9, wherein the first humidity sensor 10 and the second humidity sensor 9 are respectively connected with the controller, and the first humidity sensor 10 is located at the connection position of the first air channel section 01 and the laundry bucket body 1; the second humidity sensor 9 is located at the connection of the second air channel section 02 and the laundry bucket body 1; or, the first humidity sensor 10 is located at the air outlet of the evaporator 5, and the second humidity sensor 9 is located at the air inlet of the evaporator 5.
Wherein, the first humidity sensor 10 is used for detecting the temperature and humidity at the air inlet of the laundry barrel 1, and the second humidity sensor 9 is used for detecting the temperature and humidity at the air outlet of the laundry barrel 1. Or, the first humidity sensor 10 is used for detecting the temperature and humidity at the air outlet of the evaporator 5, and the second humidity sensor 9 is used for detecting the temperature and humidity at the air inlet of the evaporator 5. Furthermore, the controller calculates the moisture content according to the temperature and the humidity before and after the laundry tub 1, or calculates the moisture content according to the temperature and the humidity before and after the evaporator 5, so as to determine whether the laundry is dried according to the moisture content, and when determining that the laundry is dried, the controller controls the laundry dryer to stop working, thereby avoiding the problem of over-drying, and the controller is low in cost, economical and effective, and can automatically determine whether the load is dried.
Fig. 6 is a block diagram schematically illustrating a laundry dryer according to an embodiment of the present invention. As shown in fig. 6, the laundry dryer 200 includes the control system 100 of the laundry dryer as previously described.
In summary, the laundry dryer and the control system and method thereof according to the embodiments of the present invention are provided, wherein the method includes obtaining a first moisture content and a second moisture content, the first moisture content being a moisture content of air before entering the laundry tub or a moisture content of air after passing through the evaporator; the second moisture content is a moisture content of the air after passing through the drum body of the laundry or a moisture content of the air before entering the evaporator; and controlling the working state of the clothes dryer according to the first moisture content and the second moisture content, so that the problem of over-drying when a large load is dried but the internal load is not dried is avoided, whether the load is dried or not is efficiently and accurately judged, and the user experience is improved.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A control method of a clothes dryer, comprising:
acquiring a first moisture content and a second moisture content, wherein the first moisture content is the moisture content of air before entering a drum of the clothes or the moisture content of air after passing through an evaporator; the second moisture content is the moisture content of the air after passing through the clothes barrel body or the moisture content of the air before entering the evaporator;
controlling an operating state of the laundry dryer according to the first moisture content and the second moisture content.
2. The control method of a laundry dryer according to claim 1,
said controlling an operating state of said laundry dryer in accordance with said first moisture content and said second moisture content comprises:
calculating a moisture content difference from the first moisture content and the second moisture content;
calculating the variation of the moisture content difference in unit time according to the moisture content difference;
and when the variation is a negative value and the moisture content difference at the current moment is smaller than a preset moisture content difference, controlling the clothes dryer to stop working.
3. The control method of a laundry dryer according to claim 2,
said calculating a moisture content difference from said first moisture content and said second moisture content comprises:
the moisture content difference is the difference between the second moisture content and the first moisture content.
4. The control method of a laundry dryer as claimed in claim 1, wherein before acquiring the first and second moisture contents, comprising:
acquiring a first temperature and a first humidity;
acquiring a second temperature and a second humidity;
determining a first moisture content from the first temperature and the first humidity, and determining a second moisture content from the second temperature and the second humidity.
5. The control method of a laundry dryer according to claim 4,
said determining a first moisture content from said first temperature and said first humidity comprises:
determining a first saturated water vapor partial pressure according to the first temperature;
determining a first actual partial pressure of water vapor according to the first saturated partial pressure of water vapor and the first humidity;
determining the first moisture content from the first actual partial pressure of water vapour;
said determining a second moisture content from said second temperature and said second humidity comprises:
determining a second saturated water vapor partial pressure according to the second temperature;
determining a second actual partial pressure of water vapor according to the second saturated partial pressure of water vapor and the second humidity;
determining the second moisture content from the second actual partial pressure of water vapour.
6. The control method of a laundry dryer according to claim 4,
the first temperature is the temperature at the air inlet of the clothes barrel body, the first humidity is the humidity at the air inlet of the clothes barrel body, the second temperature is the temperature at the air outlet of the clothes barrel body, and the second humidity is the humidity at the air outlet of the clothes barrel body.
7. The control method of a laundry dryer according to claim 4,
the first temperature is the temperature at the evaporator air outlet, the first humidity is the humidity at the evaporator air outlet, the second temperature is the temperature at the evaporator air inlet, and the second humidity is the humidity at the evaporator air inlet.
8. A control system for a clothes dryer, comprising: the heat pump component comprises an evaporator, a condenser, a filter screen, a compressor, an electronic expansion valve, a fan and an air duct, wherein the air duct comprises a first air duct section and a second air duct section, an air outlet of the condenser is connected with an air inlet of the clothes barrel body through the first air duct section, and an air inlet of the evaporator is connected with an air outlet of the clothes barrel body through the second air duct section; the fan is positioned at the first air duct section; the filter screen is positioned at the second air duct section; the liquid inlet of the condenser is connected with the liquid outlet of the evaporator through the compressor; the liquid outlet of the condenser is connected with the liquid inlet of the evaporator through the electronic expansion valve;
further comprising:
a controller for obtaining a first moisture content and a second moisture content and controlling an operating state of said laundry dryer in accordance with said first moisture content and said second moisture content; the first moisture content is a moisture content before the air enters the drum of the laundry or a moisture content after the air passes through the evaporator; the second moisture content is a moisture content of the air after passing through the tub of the laundry or a moisture content of the air before entering the evaporator.
9. The control system of a clothes dryer of claim 8, further comprising:
the first humidity sensor and the second humidity sensor are respectively connected with the controller, and the first humidity sensor is positioned at the joint of the first air channel section and the clothes barrel body; the second humidity sensor is positioned at the joint of the second air channel section and the clothes barrel body; or the first humidity sensor is positioned at the air outlet of the evaporator, and the second humidity sensor is positioned at the air inlet of the evaporator.
10. Laundry dryer characterized in that it comprises a control system of a laundry dryer according to claim 8 or 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111196404.9A CN115976806A (en) | 2021-10-14 | 2021-10-14 | Clothes dryer and control system and method thereof |
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