Disclosure of Invention
In order to solve at least one of the above problems in the prior art, that is, in order to solve the problem that the existing clothes dryer adopting a constant speed compressor cannot automatically adjust the drying speed, the present application provides a drying control method of a clothes treatment device, the clothes treatment device comprises a box body, a drying air duct, a variable capacity variable frequency compressor, a condenser, a throttling device and an evaporator, the box body is provided with an air inlet and an air outlet, the air inlet and the air outlet are respectively communicated with the drying air duct, the variable capacity variable frequency compressor, the condenser, the throttling device and the evaporator are sequentially connected through refrigerant pipelines, the condenser and the evaporator are arranged in the drying air duct, the variable capacity variable frequency compressor comprises a cylinder body and a piston which is slidably arranged in the cylinder body, the moving stroke of the piston in the cylinder body is adjustable,
The control method comprises the following steps:
According to the information of clothes to be dried, determining the optimal exhaust amount of the compressor;
Acquiring an initial stroke of the piston;
Controlling a piston of the compressor to run according to the initial stroke and adjusting the frequency of the compressor so that the actual discharge amount of the compressor is equal to the optimal discharge amount or the difference between the actual discharge amount and the optimal discharge amount is within a preset difference range;
Acquiring the current frequency of the compressor, and judging whether the current frequency is in a preset frequency interval or not;
And selectively adjusting the moving stroke of the piston according to the judging result.
In the above preferred technical solution of the drying control method of a laundry treatment apparatus, the step of "selectively adjusting the movement stroke of the piston according to the determination result" further includes:
if the current frequency is in the preset frequency interval, controlling the compressor to continue to run at the current frequency;
and if the current frequency is not in the preset frequency range, adjusting the moving stroke of the piston.
In the above preferred technical solution of the drying control method of a laundry treatment apparatus, the step of adjusting the movement stroke of the piston if the current frequency is not within the preset frequency range further includes:
If the current frequency is smaller than the minimum value of the preset frequency interval, reducing the moving stroke of the piston;
And if the current frequency is larger than the maximum value of the preset frequency interval, increasing the moving stroke of the piston.
In a preferred embodiment of the above laundry treatment apparatus drying control method, the preset frequency interval is determined based on an optimal efficiency frequency of the compressor.
In a preferred aspect of the above laundry treatment apparatus drying control method, the step of reducing the movement stroke of the piston further includes:
the stroke to which the piston needs to be reduced is calculated by the following formula:
La=L0×[(fn-2)/fn]
wherein La is the stroke to which the piston needs to be reduced, L0 is the initial stroke, fn is the optimal efficiency frequency, and fn-2 is the minimum value of the preset frequency interval.
In a preferred aspect of the above laundry treatment apparatus drying control method, the step of increasing the movement stroke of the piston further includes:
the stroke to which the piston needs to be increased is calculated by the following formula:
Lb=L0×[(fn+2)/fn]
Lb is the stroke to which the piston needs to be increased, L0 is the initial stroke, fn is the optimal efficiency frequency, and fn+2 is the maximum value of the preset frequency interval.
In a preferred technical solution of the above-mentioned drying control method of the laundry treatment apparatus, the control method further includes:
Acquiring a drying gear;
And determining the initial stroke of the piston according to the drying gear.
In the above preferred technical solution of the drying control method of the laundry treatment apparatus, the step of "determining the optimal discharge amount of the compressor according to the laundry information to be dried" further includes:
acquiring the weight and the volume of clothes to be dried;
And determining the optimal exhaust amount of the compressor according to the weight and the volume of the clothes to be dried.
In a preferred embodiment of the above-described drying control method for a laundry treatment apparatus, the actual air displacement is calculated and determined by the following formula:
Q=f×L×π×(d/2)2
wherein Q is the actual displacement, f is the frequency of the compressor, L is the moving stroke of the piston, and d is the diameter of the cylinder.
In a preferred embodiment of the above-described drying control method for a laundry treating apparatus, the piston is connected to an adjustable elastic spring, and the step of "adjusting the moving stroke of the piston" further includes:
the movement stroke of the piston is adjusted by adjusting the elastic force of the adjustable elastic spring.
By arranging the variable-capacity variable-frequency compressor, the clothes treatment equipment can automatically adjust the drying speed by adjusting the exhaust amount and the running frequency of the compressor, and the frequency of the compressor can be operated at or near the highest point of the efficiency as much as possible, so that the drying efficiency is high, and the energy is saved.
Detailed Description
Preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present application, and are not intended to limit the scope of the present application. For example, although the steps are described in the following embodiments in terms of the above-described order, it will be understood by those skilled in the art that, in order to achieve the effects of the present embodiments, the steps need not be performed in such order, and may be performed simultaneously (in parallel) or in reverse order, and these simple variations are within the scope of the present application.
First, a drying control method of the laundry treating apparatus of the present application will be described with reference to fig. 1 and 2. Fig. 1 is a system schematic diagram of a laundry treating apparatus according to the present application, and fig. 2 is a flowchart of a drying control method of the laundry treating apparatus according to the present application.
In order to solve the problem that the existing clothes dryer adopting the constant speed compressor 1 cannot automatically adjust the drying speed, the application provides a drying control method of clothes treatment equipment. Wherein, as shown in fig. 1, the clothing treatment facility includes box 5, stoving wind channel, variable capacity variable frequency compressor 1, condenser 2, throttling arrangement 3 and evaporimeter 4, box 5 has air intake and air outlet, air intake and air outlet communicate with stoving wind channel respectively, connect gradually through the refrigerant pipeline between variable capacity variable frequency compressor 1, condenser 2, throttling arrangement 3 and the evaporimeter 4, condenser 2 and evaporimeter 4 set up in the stoving wind channel, variable capacity variable frequency compressor 1 includes cylinder body 11 and slides the piston 12 that sets up in cylinder body 11, the travel of piston 12 in cylinder body 11 is adjustable. Specifically, the drying air duct, the compressor 1, the condenser 2, the throttling device 3 and the evaporator 4 form a traditional drying loop, and the connection relationship and the drying principle among the components are conventional means in the field, and are not repeated here. In particular, the compressor 1 of the present application employs a variable capacity variable frequency compressor 1, the compressor 1 having a cylinder 11 and a piston 12, the piston 12 achieving the purpose of compression by reciprocating movement within the cylinder 11. In which the displacement travel of the piston 12 is adjustable, in other words the maximum displacement of the sliding of the piston 12 in the cylinder 11 is adjustable, i.e. L in fig. 1 is variable.
Further, in the present application, an elastic spring 13 is connected to an end of the piston 12 remote from the cylinder 11, and a moving stroke of the piston 12 is adjusted by the elastic spring 13. The present application is not limited to a specific form of the elastic spring 13, and may be applied to the present application as long as the elastic force thereof can be automatically adjusted. For example, the elastic spring 13 may be an electromagnetic spring, an air spring, a gas spring, a mechanically adjustable elastic spring 13, or the like, and the movement stroke L of the piston 12 in the cylinder 11 is adjusted by adjusting the elastic force of the elastic spring 13.
Of course, in addition to the adjustable stroke of the piston 12, other variable-capacity variable-frequency compressors 1 can be selected for replacement by those skilled in the art, so that the present application is suitable for more specific application scenarios. For example, those skilled in the art may also select a variable-volume compressor with an adjustable volume of the cylinder 11, or use other methods of adjusting the movement stroke of the compressor 1, for example, by controlling the extension/retraction length/forward/reverse rotation angle of the motor shaft, etc. to control the movement stroke of the piston 12.
Referring to fig. 2, in the above arrangement, the drying control method of the laundry treating apparatus of the present application includes:
S101, determining the optimal exhaust amount of the compressor according to the clothes to be dried. For example, the laundry information to be dried may include one or more of a laundry amount, a laundry volume, and a laundry weight, the laundry amount may be acquired based on a user input or may be determined based on an image recognition, the laundry volume may be determined based on the image recognition or may be estimated according to a laundry type input by the user, and the laundry weight may be acquired based on a weight sensor or may be determined based on a current when the cabinet is rotated, etc. After the clothes to be dried are determined, the optimal displacement of the compressor is determined based on the clothes to be dried, wherein the determination mode can be a fitting formula, an empirical formula, a comparison relation table and the like, and the application is not limited to the above.
And S103, acquiring an initial stroke of the piston, wherein the initial stroke of the piston can be input by a user, can be preset and can be determined according to a comparison relation table between initial formation and other parameters such as clothes drying information, drying gear and the like.
S105, controlling the piston of the compressor to operate according to the initial stroke and adjusting the frequency of the compressor so that the actual displacement of the compressor is equal to the optimal displacement or the difference between the actual displacement and the optimal displacement is within a preset difference range. For example, in the present application, the actual displacement during compressor operation is positively correlated to the initial stroke of the piston and the frequency of the compressor. After the optimal discharge amount and the initial stroke are determined, the elastic force of the elastic spring is adjusted, so that the compressor piston is controlled to operate according to the initial stroke, then the frequency of the compressor is adjusted, and the actual discharge amount of the compressor is obtained until the actual discharge amount of the compressor is equal to the optimal discharge amount or the difference value between the actual discharge amount and the optimal discharge amount is within a preset difference value range. Wherein, the preset difference range is preset in advance.
S107, acquiring the current frequency of the compressor, and judging whether the current frequency is in a preset frequency interval. For example, when the actual displacement of the compressor reaches the optimal displacement or the difference between the actual displacement and the optimal displacement is within a preset difference range, the current frequency of the compressor is obtained, and whether the current frequency is within a preset frequency range is determined, for example, the magnitude between the current frequency and the maximum value and the minimum value in the preset frequency range is compared by calculating the difference or the ratio. The preset frequency interval is determined based on the optimal efficiency frequency of the compressor, and if the preset frequency interval is a certain amount of floating up and down of the optimal efficiency frequency. Referring to fig. 3, the optimum efficiency frequency is the frequency at which the compressor is most efficient, and may be the rated frequency or another frequency.
And S109, selectively adjusting the moving stroke of the piston according to the judging result. For example, when the current frequency is within a preset frequency range, the moving stroke of the piston is not regulated, and when the current frequency is not within the preset frequency range, the moving stroke of the piston is regulated, so that the operating frequency of the compressor is indirectly regulated by regulating the moving stroke of the piston, and the working frequency of the compressor can be close to or reach the optimal efficiency frequency.
By arranging the variable-capacity variable-frequency compressor, the clothes treatment equipment can automatically adjust the drying speed by adjusting the exhaust amount and the running frequency of the compressor, and the frequency of the compressor can be operated at or near the highest point of the efficiency as much as possible, so that the drying efficiency is high, and the energy is saved.
The preferred embodiments of the present application will be described below taking a laundry treating apparatus as an example of a dryer.
In a preferred embodiment, the step of selectively adjusting the movement stroke of the piston according to the judgment result further comprises controlling the compressor to continue to operate at the current frequency if the current frequency is within the preset frequency range, and adjusting the movement stroke of the piston if the current frequency is not within the preset frequency range.
For example, the predetermined efficiency interval may be (fn-2, fn+2), where fn is the optimal efficiency frequency. If the current frequency is in the preset frequency range, the working frequency of the compressor is proved to be the optimal efficiency frequency or to be near the optimal efficiency frequency, the working efficiency of the compressor is highest, the clothes drying efficiency is high, the power consumption is low, the moving stroke of the piston is not required to be regulated, and the compressor is controlled to continue to run at the current frequency. Otherwise, if the current frequency is not in the preset frequency interval, the working frequency of the compressor is proved to have a certain gap from the optimal efficiency frequency, the compressor does not work at the optimal efficiency, at the moment, the working efficiency of the clothes dryer is low, the electricity consumption is high, and the moving stroke of the piston needs to be regulated so as to change the working frequency of the compressor, so that the compressor works near the optimal efficiency.
Of course, the preset efficiency interval is not constant, and a person skilled in the art can adjust the specific range according to the requirement, so long as the range is guaranteed to be near the optimal efficiency frequency.
Preferably, the step of adjusting the movement stroke of the piston if the current frequency is not in the preset frequency interval further comprises decreasing the movement stroke of the piston if the current frequency is less than the minimum value of the preset frequency interval and increasing the movement stroke of the piston if the current frequency is greater than the maximum value of the preset frequency interval.
Specifically, if the current frequency is less than the minimum value of the preset frequency interval, the operating frequency of the compressor needs to be increased, and since the actual displacement of the compressor is positively correlated with the frequency of the compressor and the moving stroke of the piston, if the actual displacement needs to be kept close to or equal to the optimal displacement, and the frequency of the compressor needs to be increased, only the moving stroke of the piston needs to be reduced. On the contrary, if the current frequency is greater than the maximum value of the preset frequency interval, the operation frequency of the compressor needs to be reduced, and at this time, only the movement stroke of the piston needs to be increased.
In a preferred embodiment, the step of reducing the travel of the piston further comprises calculating the travel to which the piston needs to be reduced by the following formula:
La=L0×[(fn-2)/fn] (1)
in the formula (1), la is the stroke to which the piston needs to be reduced, L0 is the initial stroke, fn is the optimal efficiency frequency, and fn-2 is the minimum value of the preset frequency interval.
In a preferred embodiment, the step of increasing the travel of the piston further comprises calculating the travel to which the piston needs to be increased by the following formula:
L=L0×[(fn+2)/fn] (2)
In the formula (2), L is the stroke to which the piston needs to be increased, L0 is the initial stroke, fn is the optimal efficiency frequency, and fn+2 is the maximum value of a preset frequency interval.
By adopting the formulas (1) and (2) to calculate the stroke to which the piston needs to be increased or reduced, the application can realize the stable adjustment of the frequency of the compressor until the compressor runs to the optimal efficiency frequency or the vicinity of the optimal efficiency frequency, thereby improving the working efficiency of the clothes dryer and reducing the energy consumption.
In a preferred embodiment, the control method further comprises the steps of acquiring a drying gear and determining the initial stroke of the piston according to the drying gear.
Specifically, the drying gear is selected by a user or the dryer is determined according to the information of the dried laundry, which reflects the drying speed and efficiency required by the user. And each drying gear corresponds to an initial stroke of the piston, and when the drying gear is determined, the initial stroke of the piston is also determined. The drying gear and the initial stroke of the piston are determined through a comparison relation table or according to an empirical formula or a piecewise function.
By determining the initial stroke of the piston based on the drying gear, the control method can determine the initial stroke of the piston according to the drying speed and efficiency required by a user, so that the compressor can more easily reach the optimal operating frequency when operating with the initial stroke, thereby reducing the adjusting time and improving the operating efficiency.
In a preferred technical scheme, the step of determining the optimal displacement of the compressor according to the information of the clothes to be dried further comprises the steps of acquiring the weight and the volume of the clothes to be dried and determining the optimal displacement of the compressor according to the weight and the volume of the clothes to be dried.
For example, after the laundry to be dried is put into the box, the weight and the volume of the laundry to be dried are obtained, for example, the weight of the laundry to be dried is obtained by using a weight sensor, a photo is taken in the box, and the volume of the laundry to be dried is estimated according to an image recognition technology, and the manner of estimating the weight and the volume is more commonly used in the art, so that the description is omitted. After the weight and volume of the laundry with drying are obtained, the optimum displacement of the compressor is determined based on both. Preferably, the optimal discharge amount is determined based on a table of a comparison between the volume, weight, and optimal discharge amount of the compressor for the laundry to be dried. The comparison relation table can be obtained through a large number of experiments, and the air displacement of the clothes to be dried under different weight and volume conditions when the optimal efficiency and the drying effect are achieved is determined through the experiments and is used as the optimal air displacement.
Of course, the optimal exhaust gas amount can be obtained through a fitting formula, a piecewise function and the like besides the comparison table, and the specific formula and the function mode of the optimal exhaust gas amount can be determined based on experiments, and are not described herein.
In a preferred embodiment, the actual displacement is calculated by the following formula:
Q=f×L×π×(d/2)2 (3)
In the formula (3), Q is the actual displacement, the unit is m 3/s, f is the frequency of the compressor, the unit is Hz, L is the moving stroke of the piston, the unit is m, and d is the diameter of the cylinder, and the unit is m.
The actual exhaust gas quantity is calculated through the formula (3), so that the actual exhaust gas quantity of the compressor can be accurately obtained, and the control precision of the control method is improved.
In a preferred embodiment, the piston is connected to an adjustable elastic spring, and the step of adjusting the movement stroke of the piston further includes adjusting the movement stroke of the piston by adjusting the elastic force of the adjustable elastic spring.
As described above, the elastic force of the elastic spring can be adjusted in various ways, and after the stroke to which the piston needs to be increased or decreased is calculated, the elastic force of the elastic spring is adjusted by adjusting the elastic force of the elastic spring, such as by adjusting the current of the electromagnetic spring, the air pressure of the air spring, the position of the push plate/inner push rod of the mechanically adjustable spring, etc., thereby adjusting the moving stroke of the piston.
The moving stroke of the piston can be adjusted by adjusting the elasticity of the elastic spring, so that the accurate adjustment of the moving stroke of the piston can be realized, and the compressor can be operated to the optimal efficiency frequency finally.
One possible control procedure of the present application is described below.
And after the user puts the clothes to be dried into the clothes dryer and selects a drying gear, starting to operate the clothes dryer. At this time, a weight sensor in the tub detects the weight of laundry to be dried, an image sensor detects the volume of laundry to be dried, a corresponding optimal displacement is selected from a comparison table according to the weight and volume of laundry to be dried, and an initial stroke of the cylinder is initially selected according to a gear. The compressor is then controlled to start operating based on the optimal displacement and initial stroke. After the actual displacement of the compressor reaches the optimal displacement, judging whether the running frequency f of the compressor meets fn-2 and f is less than or equal to fn+2. If yes, the compressor keeps running at the existing frequency until the drying program is finished. If f < fn-2, decreasing the cylinder stroke to La=L0× [ (fn-2)/fn ], and continuing to return to the judgment, if f > fn+2, increasing the cylinder stroke to Lb=L0× [ (fn+2)/fn ], continuing to operate and detect after the adjustment until the compressor is operated to the optimal efficiency interval, and then keeping the state to operate until the drying procedure is finished.
It will be appreciated by those skilled in the art that although the above embodiments are described in connection with a clothes dryer, this is not intended to limit the scope of application of the present application, and that those skilled in the art may apply the above control method to other application scenarios to enhance the applicability of the present application without departing from the principles of the present application. For example, the present application can be applied to a washing and drying integrated machine.
Various component embodiments of the application may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that some or all of the functions of some or all of the components in a server, client according to embodiments of the present application may be implemented in practice using a microprocessor or Digital Signal Processor (DSP). The present application may also be embodied as a device or apparatus program (e.g., a PC program and a PC program product) for performing part or all of the methods described herein. Such a program embodying the present application may be stored on a PC readable medium, or may have the form of one or more signals. Such signals may be downloaded from an internet website, provided on a carrier signal, or provided in any other form.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims of the present application, any of the claimed embodiments may be used in any combination.
It should be noted that, although the foregoing describes in detail the steps of the method of the present application, those skilled in the art may combine, split and exchange the sequence of the steps without departing from the basic principle of the present application, and the technical solution thus modified does not change the basic concept of the present application, and therefore falls within the scope of the present application.
Thus far, the technical solution of the present application has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present application is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present application, and such modifications and substitutions will fall within the scope of the present application.