CN113503728A - Dryer and control method thereof - Google Patents
Dryer and control method thereof Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The invention discloses a dryer and a control method thereof, wherein the control method of the dryer comprises the following steps: acquiring a drying instruction; acquiring a preset rotating speed change curve of the roller according to the drying instruction, wherein the preset rotating speed change curve comprises a sine curve and/or a cosine curve; and controlling the roller to rotate according to a preset rotating speed change curve. The technical scheme of the invention is beneficial to providing the drying efficiency of the dryer.
Description
Technical Field
The invention relates to the technical field of dryers, in particular to a dryer and a control method thereof.
Background
The requirements of people on household appliances are higher and higher as the living standard of people is improved at any time. For example, a higher demand is made for drying efficiency of a dryer. The existing roller dryer realizes the rapid drying of clothes by rotating the roller and turning over the clothes by the lifting ribs, in the related technology, the roller generally turns over the clothes by uniform speed change or uniform unidirectional rotation, the movement form mainly realizes the scattering of the clothes by the lifting ribs, the contact with fluid is small in the clothes drying process, and the clothes drying efficiency is low.
Disclosure of Invention
The invention mainly aims to provide a control method of a dryer, aiming at improving the drying efficiency of the dryer.
In order to achieve the above object, the present invention provides a control method of a dryer, comprising the steps of:
acquiring a drying instruction;
acquiring a preset rotating speed change curve of the roller according to the drying instruction, wherein the preset rotating speed change curve comprises a sine curve and/or a cosine curve;
and controlling the roller to rotate according to a preset rotating speed change curve.
Optionally, after the control drum rotates according to a preset rotation speed variation curve, the method further includes:
acquiring the current rotating speed of the roller and a preset rotating speed corresponding to a preset rotating speed change curve;
acquiring a speed correction according to the current rotating speed and a preset rotating speed;
the rotation speed of the drum is adjusted according to the speed correction amount.
Optionally, the dryer comprises an outer drum and a roller arranged in the outer drum, and a damping sealing ring is arranged between the outer drum and the roller;
the step of obtaining the speed correction amount according to the current rotating speed and the preset rotating speed comprises the following steps:
acquiring a speed difference between a preset rotating speed and a current rotating speed; the speed difference Va is a difference value between a preset rotating speed and the current rotating speed, and is a positive value when the preset rotating speed is greater than the current rotating speed, and is a negative value when the preset rotating speed is less than the current rotating speed;
acquiring a first damping coefficient and a second damping coefficient; the first damping coefficient is a roller transmission damping coefficient, and the second damping coefficient is a sealing ring damping coefficient;
calculating a speed correction amount Δ V from the speed difference Va, the first damping coefficient Kp, and the second damping coefficient Ki, wherein Δ V, Va, Kp, and Ki satisfy the following relationship:
Δ V ═ Va + (Kp × Va + Ki ×) r (Va is a positive value), or,
Δ V ═ Va- (Kp × Va + Ki × Va) ② (Va is a negative value).
Optionally, the step of obtaining the speed correction amount according to the current rotation speed and the preset rotation speed comprises:
acquiring the no-load current of a roller driving motor and the current of the driving motor;
and acquiring a speed correction according to the current rotating speed, the preset rotating speed, the current and the no-load current.
Optionally, the dryer comprises an outer drum and a roller arranged in the outer drum, and a damping sealing ring is arranged between the outer drum and the roller;
the step of obtaining the speed correction according to the current rotating speed, the preset rotating speed, the current and the no-load current comprises the following steps:
acquiring a speed difference between a preset rotating speed and a current rotating speed; the speed difference Va is a difference value between a preset rotating speed and the current rotating speed, and is a positive value when the preset rotating speed is greater than the current rotating speed, and is a negative value when the preset rotating speed is less than the current rotating speed;
acquiring a first damping coefficient and a second damping coefficient; the first damping coefficient is a roller transmission damping coefficient, and the second damping coefficient is a sealing ring damping coefficient;
according to the speed difference Va, the current I and the no-load current IAir conditionerCalculating a speed correction amount delta V by the first damping coefficient Kp and the second damping coefficient Ki, wherein delta V, IAt present、IAir conditionerVa, Kp and Ki satisfy the following relationship:
Δ V ═ Va + [ (Km + Kp) × Va + (Km + Ki) × Va ] (Va is a positive value), or,
Δ V ═ Va- [ (Km + Kp) × Va + (Km + Ki) × Va ] (Va is a negative value);
wherein Km ═ I (I)At present-IAir conditioner)/IAir conditioner。
Optionally, the dryer includes a vacuum pump, a heating device and a condenser, the vacuum pump is communicated with the inside of the drum, and the heating device is arranged corresponding to the air inlet of the drum; after obtaining the speed correction quantity, the method also comprises the following steps:
acquiring the required wind speed and the required temperature of the airflow in the roller according to the corrected rotating speed of the roller; wherein, the required wind speed and the required temperature are positively correlated with the current rotating speed;
acquiring the current wind speed and the current temperature of airflow in the roller, acquiring a wind speed differential according to the current wind speed and a required wind speed, and acquiring a temperature differential according to the current temperature and the required temperature;
and adjusting the power of the air pump according to the wind speed difference and adjusting the power of the heating device according to the temperature difference.
Optionally, before the step of obtaining the preset rotation speed variation curve of the drum according to the drying instruction, the method further includes:
acquiring the current weight M of an object to be dried in a roller, and acquiring the rated load of a dryer;
comparing the rated load with the current weight;
determining that the rated load is smaller than the current weight, and controlling the roller driving motor not to rotate;
and determining that the rated load is greater than or equal to the current weight, and acquiring a preset rotating speed change curve of the roller.
Optionally, the obtaining of the preset rotation speed variation curve of the drum according to the drying instruction includes:
acquiring the working current I of a roller driving motor;
obtaining the current weight M of the object to be dried according to the working current I;
acquiring a preset rotating speed change curve of the roller according to the current weight M;
wherein the current weight M and the operating current satisfy the following relationship:
I＝0.2807M+1579。
optionally, before the step of obtaining the preset rotation speed variation curve of the drum according to the current weight, the method further includes:
acquiring the rated load of the dryer;
comparing the rated load with the current weight;
determining that the rated load is smaller than the current weight, and controlling the roller driving motor not to rotate;
and determining that the rated load is greater than or equal to the current weight, and acquiring a preset rotating speed change curve of the roller according to the current weight.
Optionally, the step of obtaining a preset rotation speed variation curve of the drum according to the current weight includes:
acquiring the maximum required rotating speed change rate of the roller and the maximum required rotating speed or the minimum required rotating speed of the roller according to the current weight;
and acquiring a preset rotating speed change curve according to the maximum required rotating speed change rate and the maximum required speed or the minimum required rotating speed.
Optionally, the preset rotation speed corresponding to the preset rotation speed variation curve is:
Vo＝350*cos(wt)+950r/min。
the invention also provides a dryer, which comprises a memory, a processor and a program stored on the memory for realizing the dryer control method, wherein the memory is used for storing the program for realizing the dryer control method; the processor is configured to execute a program implementing the dryer control method to implement the steps of the dryer control method.
According to the technical scheme, the dryer firstly obtains a drying instruction, obtains a preset rotating speed change curve of the roller according to the drying instruction, and then controls the roller to rotate according to the preset rotating speed change curve, so that the aim of controlling the roller to operate according to the preset rotating speed is fulfilled; in the process, the preset rotating speed change curve comprises a sine curve and/or a cosine curve, so that the speed of the drum is continuously changed, the acceleration is different, the drum is accelerated to rotate, and the clothes are easy to scatter in the process of accelerated movement, so that the contact area between the clothes and the airflow in the drum is greatly increased, the moisture of the clothes is favorably dissipated, and the drying efficiency of the clothes is favorably improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic flow chart illustrating a dryer control method according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a dryer control method according to another embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an embodiment of a dryer of the present invention;
FIG. 4 is a schematic diagram of an embodiment of a predetermined variation curve of a drum rotation speed of a dryer according to the present invention.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, "and/or" in the whole text includes three schemes, taking a and/or B as an example, including a technical scheme, and a technical scheme that a and B meet simultaneously; in addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The present invention mainly provides a control method of a dryer, which is mainly applied to a drum 100 dryer to improve the scattering efficiency of the drum 100 to clothes in the rotation process, thereby increasing the contact area of the clothes and fluid in the drying process, and achieving the purpose of improving the drying efficiency. The roller 100 dryer is a dryer comprising a roller 100, wherein cotton wool fabrics to be dried wait for drying objects in the roller 100, and in the rotation process of the roller 100, the objects to be dried move along with the cotton wool fabrics to be dried and contact with flowing high-temperature air, and the high-temperature air takes away moisture on the objects to be dried (the moisture is taken away by evaporation), so that the objects to be dried are dried quickly. The drum 100 dryer includes a drum 100 and a tub 200, and the drum 100 is disposed inside the tub 200 to rotate compared to the tub 200. A heating device is provided at the air inlet 110 of the drum 100 to adjust the temperature of air introduced into the drum 100. The dryer further includes an air driving device provided in an air duct of the dryer to draw air inside the drum 100, so that heated air can enter the drum 100 from the air inlet 110 and can be discharged out of the drum 100 from the air outlet of the drum 100.
Hereinafter, a detailed flow of a control method of the dryer will be mainly described.
Referring to fig. 1 to 4, in an embodiment of the present invention, a control method of a dryer includes:
acquiring a drying instruction;
acquiring a preset rotating speed variation curve of the drum 100 according to the drying instruction, wherein the preset rotating speed variation curve comprises a sine curve and/or a cosine curve;
the drum 100 is controlled to rotate according to a preset rotation speed variation curve.
Specifically, in this embodiment, there are various manners for the dryer to obtain the drying instruction, for example, receiving the drying instruction sent by the user through the mobile terminal, receiving the drying instruction sent by the user through a physical key of the dryer, or generating the drying instruction after the dryer reaches the drying condition in the operation process of the dryer. After receiving the drying command, the dryer acquires a rotation speed curve matching the drying command and controlling the rotation of the drum 100, and the rotation speed curve is pre-stored in a storage medium of the dryer. Of course, in the storage medium, a time-speed mapping table corresponding to a predetermined variation curve of the rotation speed may be stored, and the predetermined speed corresponding to the predetermined variation curve may be obtained according to the running time axis. The preset rotation speed variation curve may be a sine curve, a cosine curve, a sine curve and a cosine curve, and in some embodiments, other types of curves may be combined with the sine curve and/or the cosine curve.
After the preset rotation speed variation curve is obtained, the rotation speed of the drum 100 is adjusted by adjusting the driving motor 500 or the transmission mechanism 600, so that the rotation speed of the drum 100 conforms to the preset rotation speed variation curve. It should be noted that the controlling of the drum 100 to rotate according to the preset rotation speed variation curve may be performed when the drum 100 starts to start (for example, the time when the drum 100 starts to rotate is the starting time of the preset rotation speed variation curve), or may be performed when the drum 100 has started and the rotation speed is stable (for example, after the drum 100 rotates for 2s to 8s, the drum 100 may be controlled to rotate according to the preset rotation speed variation curve, and at this time, the time point after the drum 100 rotates for 2s to 8s is the starting point of the preset rotation speed variation curve).
In this embodiment, the dryer first obtains the drying instruction, obtains the preset rotation speed variation curve of the drum 100 according to the drying instruction, and then controls the drum 100 to rotate according to the preset rotation speed variation curve, so as to achieve the purpose of controlling the drum 100 to operate according to the preset rotation speed; in this process, the preset rotation speed variation curve includes a sine curve and/or a cosine curve, so that the speed of the drum 100 is continuously changed, and the acceleration is different, that is, the drum 100 is accelerated to rotate, and the laundry is more easily dispersed in the process of accelerated movement, so that the contact area between the laundry and the airflow in the drum 100 is greatly increased, thereby facilitating the dissipation of the moisture of the laundry, and facilitating the improvement of the drying efficiency of the laundry.
In some embodiments, in order to improve the accuracy of the rotation speed of the drum 100 to improve the drying efficiency of the dryer, after the control of the drum 100 to rotate according to the preset rotation speed variation curve, the method further includes:
acquiring the current rotating speed of the roller 100 and a preset rotating speed corresponding to a preset rotating speed change curve;
acquiring a speed correction according to the current rotating speed and a preset rotating speed;
the rotation speed of the drum 100 is adjusted according to the speed correction amount.
Specifically, in the present embodiment, there may be many ways to obtain the current rotation speed of the drum 100, such as by providing a speed sensor for detection. The preset rotation speed can be obtained through a time-speed mapping table corresponding to a preset rotation speed change curve, and the time corresponds to the speed one by one. Of course, in some embodiments, the rotation speed may be directly obtained from the preset rotation speed variation curve. There are various ways to obtain the speed correction amount according to the current rotation speed and the preset rotation speed, for example, the speed difference between the current rotation speed and the preset rotation speed can be directly calculated, the rotation speed of the drum 100 is adjusted by the speed difference, and the larger the speed difference is, the larger the speed correction amount needs to be adjusted is; the speed difference may also be considered, and meanwhile, the stress and friction of the drum 100 during operation are considered, that is, the rotation speed of the drum 100 is adjusted through the speed difference and the friction coefficient, that is, in this embodiment, the speed correction amount is obtained through the current rotation speed, the preset rotation speed, and the friction coefficient (the friction coefficient may be generated during the rotation of the drum 100, or may be generated during the speed change of the drum 100); of course, in some embodiments, the effect of the load on the rotational speed may also be taken into account. After obtaining the speed correction amount, the rotation speed of the motor and/or the transmission mechanism 600 and the like are/is adjusted,so that the rotation speed of the drum 100 approaches to or is adjusted to the preset rotation speed. Of course, in some embodiments, the preset rotation speed may also be obtained by calculation, and after the preset rotation speed variation curve is determined, a curve equation of the curve may be obtained, for example, the preset rotation speed corresponding to the preset rotation speed variation curve is: vo＝350*cos(wt)+950r/min。
The following description will be given by way of example to acquire the speed correction amount:
the dryer includes an outer tub 200 and a drum 100 disposed in the outer tub 200, and a damping gasket 300 is disposed between the outer tub 200 and the drum 100. The step of obtaining the speed correction amount according to the current rotating speed and the preset rotating speed comprises the following steps:
acquiring a speed difference between a preset rotating speed and a current rotating speed; the speed difference Va is a difference value between a preset rotating speed and the current rotating speed, and is a positive value when the preset rotating speed is greater than the current rotating speed, and is a negative value when the preset rotating speed is less than the current rotating speed;
acquiring a first damping coefficient and a second damping coefficient; the first damping coefficient is a transmission damping coefficient of the roller 100, and the second damping coefficient is a damping coefficient of the sealing ring 300;
calculating a speed correction amount Δ V from the speed difference Va, the first damping coefficient Kp, and the second damping coefficient Ki, wherein Δ V, Va, Kp, and Ki satisfy the following relationship:
Δ V ═ Va + (Kp × Va + Ki ×) r (Va is a positive value), or,
Δ V ═ Va- (Kp × Va + Ki × Va) ② (Va is a negative value).
Specifically, in the present embodiment, the speed difference is calculated by the preset rotation speed, the current rotation speed, and the first and second damping coefficients. Firstly, calculating the speed difference between the preset rotating speed and the current rotating speed in a manner of subtracting the current rotating speed from the preset rotating speed, wherein when the preset rotating speed is greater than the current rotating speed, the speed difference is a positive value, and at this time, the rotating speed of the roller 100 needs to be increased; when the preset rotation speed is less than the current rotation speed, the speed difference is a negative value, and the rotation speed of the drum 100 needs to be reduced; when the preset rotation speed is equal to the current rotation speed, the speed difference is zero, and the rotation speed of the drum 100 does not need to be adjusted. The first damping coefficient is a transmission damping coefficient of the drum 100, and during the speed adjustment process of the drum 100, since the speed is abruptly changed, the drum 100 shakes, a larger friction is generated, and a driving force is required to be lost, for example, a friction force of a belt driving the drum 100 to operate, a friction force of a bearing 130 of the drum 100, and the like are abruptly changed. The first damping coefficient Kp takes a value of a certain fixed value between 0.1 and 0.2, such as 0.1 or 0.12 or 0.15 or 0.18 or 0.2, for example, 0.15. The second damping coefficient is a damping coefficient of the packing 300 caused by the damping packing 300 between the drum 100 and the tub 200. The value of the second damping coefficient Ki is a fixed value between 0.08 and 0.12, such as 0.08, 0.10, 0.12, and 0.1 as an example. In the present application, by providing the damping sealing ring 300 between the drum 100 and the outer tub 200, not only the drum 100 can be sealed, but also the air flow can circulate in the drum 100, so as to improve the utilization rate of wind energy and the drying efficiency; meanwhile, inevitable vibration and shaking are generated in the rotation process of the roller 100, and the sealing ring 300 can also play a role in buffering and stabilizing the roller 100, so that the damping sealing ring 300 is also beneficial to improving the rotation reliability of the roller 100 and the stable work of the dryer.
In summary, when the preset rotating speed is greater than the current rotating speed, a formula (I) is used for calculating the speed increment, and the speed correction delta V is a positive value at the moment; when the preset rotating speed is smaller than the current rotating speed, calculating the speed correction quantity by using a formula II, wherein the speed correction quantity delta V is a negative value.
Of course, in some embodiments, the effect of temperature on the coefficient of friction of the drum 100 during its rotation may also be considered. The coefficient of dynamic friction between the same materials will change at different temperatures. That is, it is possible to obtain the temperature of the damping members (one or more of the driving belt, the damping packing 300, the bearing 130, etc.) during the rotation of the drum 100, and obtain the current friction coefficient of each damping member according to the temperature. And the friction coefficient of each damping member at the time of the last detection is acquired (also acquired from the detected temperature), the difference between the friction coefficients of the two detections is calculated from the current friction coefficient and the friction coefficient of the previous detection, and the difference between the friction coefficients is set to a third damping coefficient K3, and then the product of K3 and the speed difference Va is taken as part of the formula. The speed correction amount after considering the temperature change is:
Δ V ═ Va + (Kp × Va + Ki × Va + K3 × (1) (Va is a positive value), or,
Δ V ═ Va- (Kp × Va + Ki × Va + K3 × Va) (2) (Va is a negative value).
In some embodiments, the step of obtaining the speed correction amount according to the current rotation speed and the preset rotation speed includes:
acquiring the idle current of the driving motor 500 of the drum 100 and the current of the driving motor 500;
and acquiring a speed correction according to the current rotating speed, the preset rotating speed, the current and the no-load current.
Specifically, in this embodiment, there are many ways to obtain the idle current and the current, for example, the current can be directly detected by a current detection device such as a current meter. The current is positively correlated with the present load, and as the mass in the drum 100 increases, the operating current of the motor increases. Therefore, typically, the present current will be greater than the idle current.
As an example, the dryer includes a tub 200 and a drum 100 disposed in the tub 200, and a damping gasket 300 is disposed between the tub 200 and the drum 100;
the step of obtaining the speed correction according to the current rotating speed, the preset rotating speed, the current and the no-load current comprises the following steps:
acquiring a speed difference between a preset rotating speed and a current rotating speed; the speed difference Va is a difference value between a preset rotating speed and the current rotating speed, and is a positive value when the preset rotating speed is greater than the current rotating speed, and is a negative value when the preset rotating speed is less than the current rotating speed;
acquiring a first damping coefficient and a second damping coefficient; the first damping coefficient is a transmission damping coefficient of the roller 100, and the second damping coefficient is a damping coefficient of the sealing ring 300;
according to the speed difference Va, the current I and the no-load current IAir conditionerA first damping coefficient Kp and a second damping coefficientThe damping coefficient Ki calculates a speed correction amount Δ V, where Δ V, IAt present、IAir conditionerVa, Kp and Ki satisfy the following relationship:
Δ V ═ Va + [ (Km + Kp) × Va + (Km + Ki) × Va ] (Va is a positive value), or,
Δ V ═ Va- [ (Km + Kp) × Va + (Km + Ki) × Va ] (Va is a negative value);
wherein Km ═ I (I)At present-IAir conditioner)/IAir conditioner。
Specifically, in the present embodiment, the speed difference is calculated by the preset rotation speed, the present rotation speed, the no-load current, the present current, and the first and second damping coefficients. Firstly, calculating the speed difference between the preset rotating speed and the current rotating speed in a manner of subtracting the current rotating speed from the preset rotating speed, wherein when the preset rotating speed is greater than the current rotating speed, the speed difference is a positive value, and at this time, the rotating speed of the roller 100 needs to be increased; when the preset rotation speed is less than the current rotation speed, the speed difference is a negative value, and the rotation speed of the drum 100 needs to be reduced; when the preset rotation speed is equal to the current rotation speed, the speed difference is zero, and the rotation speed of the drum 100 does not need to be adjusted. And then acquiring a first damping coefficient, a second damping coefficient and a load influence coefficient Km. The first damping coefficient and the second damping coefficient are the same as those in the above embodiments, and are not described herein again. With regard to the relationship between Km and the present and idle current, reference is made to Km ═ IAt present-IAir conditioner)/IAir conditioner。
In conclusion, when the preset rotating speed is greater than the current rotating speed, the speed increment is calculated by using a formula III, and the speed correction delta V is a positive value at the moment; and when the preset rotating speed is smaller than the current rotating speed, calculating the speed correction quantity by using a formula (IV), wherein the speed correction quantity delta V is a negative value.
Of course, with reference to the above embodiments, in some embodiments, the effect of temperature on the coefficient of friction of the drum 100 during its rotation may also be taken into account. The speed correction amount after considering the temperature change is:
Δ V ═ Va + [ (Km + Kp + K3) × Va + (Km + Ki + K3) × Va ] (3) (Va is a positive value), or,
Δ V ═ Va- [ (Km + Kp + K3) × Va + (Km + Ki + K3) × Va ] (4) (Va is a negative value);
wherein Km ═ I (I)At present-IAir conditioner)/IAir conditioner。
In some embodiments, in order to further improve the drying efficiency of the dryer, the dryer includes a vacuum pump 700, a heating device and a condenser 800, the vacuum pump 700 is communicated with the inside of the drum 100, and the heating device is disposed corresponding to the air inlet 110 of the drum 100; after obtaining the speed correction quantity, the method also comprises the following steps: acquiring a required wind speed and a required temperature of an air flow in the drum 100 according to the corrected rotating speed of the drum 100; wherein, the required wind speed and the required temperature are positively correlated with the current rotating speed; acquiring the current wind speed and the current temperature of the airflow in the roller 100, acquiring a wind speed differential according to the current wind speed and a required wind speed, and acquiring a temperature differential according to the current temperature and the required temperature; the power of the air pump 700 is adjusted according to the wind speed difference, and the power of the heating device is adjusted according to the temperature difference.
Specifically, in the present embodiment, the dryer heats the air by the heating device, so that the air entering the drum 100 is hot air, and the temperature adjustment of the air can be realized by adjusting the power of the heating device. The vacuum pump 700 is communicated with the interior of the drum 100 through the air outlet of the drum 100, the vacuum pump 700 pumps the air in the drum 100, and under the action of the air, a negative pressure is formed in the drum 100, so that the air enters the drum 100 from the air inlet 110 of the drum 100 and is exhausted from the air outlet of the drum 100, and the flow rate of the air flow in the drum 100 can be adjusted by adjusting the power of the vacuum pump 700. So that the hot air dries the laundry in the drum 100. The extracted air passes through the condenser 800 to condense moisture in the air and is discharged or stored in a water tank of the dryer. In order to facilitate rapid condensation of air in the condenser 800, a fan assembly 900 is provided at a side of the condenser 800 facing away from the drum 100.
The rotation speed of the drum 100 is different, the rotation speed of the laundry inside is different, and the scattering of the laundry is different. The clothes are scattered to different degrees, the amount of hot air required in unit time is different, when the clothes are scattered to a larger degree, the amount of hot air required in unit time is larger, and when the clothes are scattered to a smaller degree, the amount of hot air required in unit time is smaller. In the storage medium, a mapping table of rotation speed-temperature-wind speed may be stored, that is, the required temperature and the required wind speed corresponding to the current rotation speed may be obtained according to the current rotation speed. After the current wind speed and the current temperature are detected, subtracting the current temperature from the required temperature to obtain temperature difference; and subtracting the current wind speed from the required wind speed to obtain the wind speed difference. Adjusting the heating device according to the temperature difference so that the temperature of the air entering the roller 100 reaches the required temperature; the power of the pump 700 is adjusted according to the speed difference so that the flow rate of the air in the drum 100 reaches the required wind speed. Therefore, the rotating speed of the roller 100, the flow speed of air in the roller 100 and the air temperature are unified and coordinated, the energy efficiency ratio of the dryer is improved through interaction, and the drying efficiency is greatly improved.
Of course, in some embodiments, while the rotation speed of the drum 100 varies according to a sine or cosine curve, the specific rotation speed of the drum 100 is also related to the weight of the laundry in the drum 100. The rotation speed of the drum 100 and the relationship between the rotation speed variation and the weight are as described in the following embodiments.
In some embodiments, in order to improve the operation safety of the dryer, before the step of obtaining the preset rotation speed variation curve of the drum 100 according to the drying instruction, the method further includes:
acquiring the current weight M of an object to be dried in the roller 100, and acquiring the rated load of the dryer;
comparing the rated load with the current weight;
determining that the rated load is smaller than the current weight, and controlling the roller 100 to drive the motor not to rotate;
and determining that the rated load is greater than or equal to the current weight, and acquiring a preset rotating speed change curve of the roller 100.
Specifically, in the present embodiment, the current weight of the belt-dried lint fabric in the drum 100 is obtained first, and the maximum rated load of the dryer is obtained. Comparing the rated load with the current weight, and determining that the rated load is less than the current weight indicates that the current weight of the clothes with drying exceeds the maximum load of the dryer, if the drum 100 rotates at this time, the dryer may be damaged, which is not favorable for the safe operation of the dryer. If the rated load is determined to be greater than or equal to the current weight, it indicates that the current weight of the clothes is within the range of the drying capacity of the dryer, and at this time, the preset rotating speed change curve of the drum 100 is obtained, so that the phenomenon that the clothes cannot run after the preset rotating speed change curve is obtained is avoided. Therefore, whether the current weight is within the drying range of the dryer or not is judged in time, the dryer is prevented from being damaged by safety accidents, and meanwhile, timely prompt of operators is facilitated, and processing is carried out as early as possible.
In some embodiments, in order to obtain a more accurate preset rotation speed variation curve, the obtaining of the preset rotation speed variation curve of the drum 100 according to the drying instruction includes:
acquiring the working current I of the driving motor 500 of the roller 100;
obtaining the current weight M of the object to be dried according to the working current I;
acquiring a preset rotating speed change curve of the roller 100 according to the current weight M;
wherein the current weight M and the operating current satisfy the following relationship:
I＝0.2807M+1579。
specifically, in the present embodiment, when laundry of different weights is dried, the required rotation speed (including the maximum rotation speed, the minimum rotation speed, etc.) of drum 100 and the change rate of the rotation speed (the change amount of the speed per unit time) are different. Different predetermined speed profiles, periods and/or peaks are different. Firstly, the working current of the driving motor 500 is obtained, then the current weight of the object to be dried is obtained according to the working current, and then a preset rotating speed change curve matched with the current weight is obtained according to the current weight. It should be noted that the operating current I is the current data collected by the adc, and the rated load of the dryer is different according to the type of the dryer, that is, the maximum value of the current weight M (unit is g) (the drum can work normally) is different. For example, in the present embodiment, the rated load is 1500g, and then the maximum value of the current weight M is 1500 g. There are various ways to obtain the preset rotation speed variation curve according to the current weight, for example, if a mapping table of the current weight-preset rotation speed variation curve is stored in the storage medium, the corresponding preset rotation speed variation curve can be obtained through the current weight. In some embodiments, the preset rotation speed variation curve of the drum 100 according to the current weight may be obtained by a maximum rotation speed, a maximum rotation speed variation rate, or the like, for example, the step of obtaining the preset rotation speed variation curve of the drum 100 according to the current weight includes:
acquiring the maximum required rotating speed change rate of the drum 100 and the maximum required rotating speed or the minimum required rotating speed of the drum 100 according to the current weight; and acquiring a preset rotating speed change curve according to the maximum required rotating speed change rate and the maximum required speed or the minimum required rotating speed.
Specifically, in the present embodiment, different current weights require different maximum required rotational speed change rates and different maximum required rotational speeds. As the current weight increases, the maximum required rotation speed also increases, and only when the maximum required rotation speed is reached, the laundry in the drum 100 can be sufficiently rotated, so that the contact area between the laundry and the air is ensured, and meanwhile, the necessary kinetic energy is provided for scattering the laundry. Of course, the maximum required speed cannot exceed the maximum speed that the dryer can withstand, and an excessive speed may cause the dryer to operate stably. The maximum required rotation speed rate is increased as the weight is increased, so that the laundry can be sufficiently scattered during the rotation. Similarly, the maximum required speed change rate should not be too large and cannot exceed the speed change rate that affects the operational stability of the drum 100. In a specific implementation process, the mapping table of the current weight to the maximum required rotating speed can be stored by using the mapping table of the current weight to the maximum required rotating speed change rate. After the maximum required rotating speed change rate and the maximum required speed or the minimum required rotating speed are obtained, a corresponding preset rotating speed change curve is selected according to the factors.
In some embodiments, in order to improve the operation stability of the dryer, the step of obtaining the preset rotation speed variation curve of the drum 100 according to the current weight further includes, before the step of: acquiring the rated load of the dryer; comparing the rated load with the current weight; determining that the rated load is smaller than the current weight, and controlling the roller 100 to drive the motor not to rotate; and determining that the rated load is greater than or equal to the current weight, and acquiring a preset rotating speed change curve of the roller 100 according to the current weight. Specifically, in this embodiment, before obtaining the preset speed variation curve, the current weight and the rated load are obtained, and whether the motor works is determined according to the current weight and the rated load. When the current weight is greater than the limit load, the driving motor 500 cannot provide enough power, and at this time, the driving motor 500 does not work and sends prompt information (light information prompt, sound information prompt, vibration prompt, message prompt) to the outside. When the current weight is smaller than the limit load, a preset rotation speed variation curve is obtained, and the driving motor 500 is controlled to work, so that the drum 100 rotates according to the preset rotation speed variation curve.
It should be noted that the above embodiment is a drying mode with relatively high energy efficiency, and in some embodiments, in order to shorten the drying time, the drying time may be implemented by increasing the temperature (power of the heating device), increasing the wind speed (power of the vacuum suction pump 700), and the like.
Referring to fig. 4, in some embodiments, in order to improve the drying efficiency of the dryer, the drum may rotate in a reverse direction (forward rotation) after a preset time duration according to sine or cosine forward rotation (reverse rotation), and rotate in a forward direction (reverse rotation) after the preset time duration in the reverse rotation (forward rotation), and such a cycle is performed, so that the drying efficiency is further improved through forward and reverse rotation variable speed rotation, which is beneficial to improving the scattering rate of the objects to be dried, and further improves the drying efficiency. Of course, in some embodiments, to further improve the effect, the drying device may rotate forward for a preset time according to the sine (cosine) and then rotate backward for a preset time according to the cosine (sine), and thus rotate forward and backward repeatedly until the drying operation is completed. The preset time period may be selected many times, and may be set according to a specific working condition, for example, 20s to 40s, and take 30s as an example.
The present invention further provides a dryer using the above-mentioned dryer control method, and the specific manner of the dryer control method refers to the above-mentioned embodiments, and since the dryer adopts all the technical solutions of all the above-mentioned embodiments, the dryer at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and details are not repeated herein. Wherein the dryer includes a memory for storing a program for implementing the dryer control method, a processor, and a program stored on the memory for implementing the dryer control method; the processor is configured to execute a program implementing the dryer control method to implement the steps of the dryer control method described above.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (12)
1. A control method of a dryer, characterized by comprising the steps of:
acquiring a drying instruction;
acquiring a preset rotating speed change curve of the roller according to the drying instruction, wherein the preset rotating speed change curve comprises a sine curve and/or a cosine curve;
and controlling the roller to rotate according to a preset rotating speed change curve.
2. The control method of the dryer according to claim 1, further comprising, after the control drum rotates according to a preset rotation speed variation curve:
acquiring the current rotating speed of the roller and a preset rotating speed corresponding to a preset rotating speed change curve;
acquiring a speed correction according to the current rotating speed and a preset rotating speed;
the rotation speed of the drum is adjusted according to the speed correction amount.
3. The dryer control method of claim 2, wherein said dryer comprises an outer tub and a drum disposed in said outer tub, a damping gasket being disposed between said outer tub and said drum;
the step of obtaining the speed correction amount according to the current rotating speed and the preset rotating speed comprises the following steps:
acquiring a speed difference between a preset rotating speed and a current rotating speed; the speed difference Va is a difference value between a preset rotating speed and the current rotating speed, and is a positive value when the preset rotating speed is greater than the current rotating speed, and is a negative value when the preset rotating speed is less than the current rotating speed;
acquiring a first damping coefficient and a second damping coefficient; the first damping coefficient is a roller transmission damping coefficient, and the second damping coefficient is a sealing ring damping coefficient;
calculating a speed correction amount Δ V from the speed difference Va, the first damping coefficient Kp, and the second damping coefficient Ki, wherein Δ V, Va, Kp, and Ki satisfy the following relationship:
Δ V ═ Va + (Kp × Va + Ki ×) r (Va is a positive value), or,
Δ V ═ Va- (Kp × Va + Ki × Va) ② (Va is a negative value).
4. The control method of the dryer according to claim 2, wherein the step of obtaining the speed correction amount based on the current rotation speed and the preset rotation speed comprises:
acquiring the no-load current of a roller driving motor and the current of the driving motor;
and acquiring a speed correction according to the current rotating speed, the preset rotating speed, the current and the no-load current.
5. The dryer control method of claim 4, wherein said dryer comprises an outer tub and a drum disposed in said outer tub, a damping gasket being disposed between said outer tub and said drum;
the step of obtaining the speed correction according to the current rotating speed, the preset rotating speed, the current and the no-load current comprises the following steps:
acquiring a speed difference between a preset rotating speed and a current rotating speed; the speed difference Va is a difference value between a preset rotating speed and the current rotating speed, and is a positive value when the preset rotating speed is greater than the current rotating speed, and is a negative value when the preset rotating speed is less than the current rotating speed;
acquiring a first damping coefficient and a second damping coefficient; the first damping coefficient is a roller transmission damping coefficient, and the second damping coefficient is a sealing ring damping coefficient;
according to the speed difference Va, the current I and the no-load current IAir conditionerCalculating a speed correction amount delta V by the first damping coefficient Kp and the second damping coefficient Ki, wherein delta V, IAt present、IAir conditionerVa, Kp and Ki satisfy the following relationship:
Δ V ═ Va + [ (Km + Kp) × Va + (Km + Ki) × Va ] (Va is a positive value), or,
Δ V ═ Va- [ (Km + Kp) × Va + (Km + Ki) × Va ] (Va is a negative value);
wherein Km ═ I (I)At present-IAir conditioner)/IAir conditioner。
6. The control method of the dryer according to any one of claims 2 to 5, the dryer comprising a vacuum suction pump, a heating device and a condenser, the vacuum suction pump being communicated with the inside of the drum, the heating device being provided corresponding to the air inlet of the drum; the method is characterized by further comprising the following steps after the speed correction quantity is obtained:
acquiring the required wind speed and the required temperature of the airflow in the roller according to the corrected rotating speed of the roller; wherein, the required wind speed and the required temperature are positively correlated with the current rotating speed;
acquiring the current wind speed and the current temperature of airflow in the roller, acquiring a wind speed differential according to the current wind speed and a required wind speed, and acquiring a temperature differential according to the current temperature and the required temperature;
and adjusting the power of the air pump according to the wind speed difference and adjusting the power of the heating device according to the temperature difference.
7. The control method of the dryer according to claim 1, further comprising, before the step of obtaining the preset rotation speed variation curve of the drum according to the drying command:
acquiring the current weight M of an object to be dried in a roller, and acquiring the rated load of a dryer;
comparing the rated load with the current weight;
determining that the rated load is smaller than the current weight, and controlling the roller driving motor not to rotate;
and determining that the rated load is greater than or equal to the current weight, and acquiring a preset rotating speed change curve of the roller.
8. The control method of the dryer according to claim 1, wherein said obtaining the preset rotation speed variation curve of the drum according to the drying command comprises:
acquiring the working current I of a roller driving motor;
obtaining the current weight M of the object to be dried according to the working current I;
acquiring a preset rotating speed change curve of the roller according to the current weight M;
wherein the current weight M and the operating current satisfy the following relationship:
I＝0.2807M+1579。
9. the control method of the dryer according to claim 8, further comprising, before the step of obtaining the preset rotation speed variation curve of the drum according to the current weight:
acquiring the rated load of the dryer;
comparing the rated load with the current weight;
determining that the rated load is smaller than the current weight, and controlling the roller driving motor not to rotate;
and determining that the rated load is greater than or equal to the current weight, and acquiring a preset rotating speed change curve of the roller according to the current weight.
10. The control method of the dryer according to claim 8, wherein the step of obtaining the preset rotation speed variation curve of the drum according to the current weight comprises:
acquiring the maximum required rotating speed change rate of the roller and the maximum required rotating speed or the minimum required rotating speed of the roller according to the current weight;
and acquiring a preset rotating speed change curve according to the maximum required rotating speed change rate and the maximum required speed or the minimum required rotating speed.
11. The control method of the dryer according to any one of claims 1 to 10, wherein the preset rotation speed corresponding to the preset rotation speed variation curve is:
Vo＝350*cos(wt)+950r/min。
12. a dryer comprising a memory for storing a program implementing a dryer control method, a processor, and a program stored on the memory for implementing the dryer control method; the processor is configured to execute a program implementing the dryer control method to implement the steps of the dryer control method according to any one of claims 1 to 11.
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Effective date of registration: 20240531 Address after: 518000 tower 801, Shenzhen International Qianhai Yidu building, No. 99, Gangcheng street, Nanshan street, Qianhai Shenzhen Hong Kong cooperation zone, Shenzhen, Guangdong Patentee after: Shenzhen Spiral Galaxy Technology Co.,Ltd. Country or region after: China Address before: Room 201, Building A, No. 1, Qianwan Road, Qianhai-Shenzhen-Hong Kong Cooperation Zone, Shenzhen, Guangdong Province, 518000 Patentee before: Ganwei Intelligent Technology (Shenzhen) Co.,Ltd. Country or region before: China |