阅读说明：本技术 一种清洗机烘干方法及应用该方法的清洗机 (Drying method of cleaning machine and cleaning machine applying same ) 是由 杨海莺 任洁 沈伟 于 2021-01-20 设计创作，主要内容包括：本发明涉及一种清洗机烘干方法,烘干工作启动后,控制向清洗机腔体内吹风的风机按照设定转速工作,同时实时获取风机的实时转速、清洗机腔体内的湿度数据,进而根据湿度数据计算当前烘干效率；比较当前风机实时转速与设定转速,比较当前烘干效率与设定烘干效率,根据比较结果加热元件的加热功率或调节风机的转速。该清洗机烘干方法能够保证发热元件安全工作,且能保证最佳烘干效率。本发明还涉及应用该方法的清洗机,干烧风险低、成本低。(The invention relates to a cleaning machine drying method, after drying work is started, a fan for blowing air into a cleaning machine cavity is controlled to work according to a set rotating speed, meanwhile, the real-time rotating speed of the fan and humidity data in the cleaning machine cavity are obtained in real time, and then the current drying efficiency is calculated according to the humidity data; comparing the current real-time rotating speed of the fan with the set rotating speed, comparing the current drying efficiency with the set drying efficiency, and heating the heating power of the element or adjusting the rotating speed of the fan according to the comparison result. The drying method of the cleaning machine can ensure the safe work of the heating element and can ensure the optimal drying efficiency. The invention also relates to a cleaning machine applying the method, which has low risk of dry burning and low cost.)

1. A drying method of a cleaning machine is characterized in that: after the drying operation is started, controlling a fan blowing air into the cavity of the cleaning machine to operate according to a set rotating speed, and simultaneously acquiring the real-time rotating speed of the fan and humidity data in the cavity of the cleaning machine in real time so as to calculate the current drying efficiency according to the humidity data;

comparing the current real-time rotating speed of the fan with the set rotating speed, comparing the current drying efficiency with the set drying efficiency, and heating the heating power of the element or adjusting the rotating speed of the fan according to the comparison result.

2. The washer drying method as recited in claim 1, wherein: comparing the current real-time rotating speed N of the fan with a set rotating speed N0, if N0-N is less than E, judging that the rotating speed of the fan is normal, otherwise, judging that the rotating speed of the fan is reduced, wherein E is a set rotating speed error value, and E is more than 0;

when the rotating speed of the fan is normal, the power of a heating element for heating the cavity of the cleaning machine is adjusted according to the real-time rotating speed N of the fan in a matching manner, and then hot air is blown into the cavity of the cleaning machine to perform drying work;

when the rotating speed of the fan is judged to be reduced, the set rotating speed value of the fan is increased, and the heating power of the heating element is reduced;

when the rotating speed of the fan is normal and the drying efficiency is smaller than the set drying efficiency, the heating element is judged to be invalid, and then the rotating speed of the fan is controlled to be increased.

3. The washer drying method as recited in claim 2, wherein: and when the heating element is judged to be invalid, gradually increasing the rotating speed of the fan according to the set unit regulating quantity until the rotating speed of the fan reaches the maximum value or the drying efficiency reaches the set drying efficiency.

4. The washer drying method as recited in claim 3, wherein: after the heating element is judged to be invalid, the actual rotating speed value of the fan is obtained while the rotating speed of the fan is controlled to be increased, and the heating power of the heating element is obtained according to the real-time rotating speed value after the fan is adjusted.

5. The washer drying method as recited in claim 4, wherein: when the heating element is judged to be invalid, the heating power of the heating element is reduced, meanwhile, the heating element is controlled to perform heating work intermittently, and the intermittent time of the heating element in one working cycle is determined according to the drying efficiency.

6. The washer drying method according to any one of claims 2 to 5, wherein: and under the condition that N0-N is less than E, controlling to close the heating element, restarting the fan, and if the restarting frequency of the fan reaches a first set frequency and still meets the condition that N0-N is less than E, judging that the rotating speed of the fan is reduced.

7. The washer drying method according to any one of claims 2 to 5, wherein: and when the rotating speed of the fan is normal and the drying efficiency is less than the set drying efficiency, restarting the heating element, and if the times of restarting the heating element reaches a second set time and the drying efficiency is still less than the set drying efficiency, judging that the heating element is invalid.

8. The washer drying method according to any one of claims 1 to 5, wherein: the heating value of the heating element is adjusted through the silicon controlled chopper circuit, and the PWM duty ratio of the silicon controlled chopper circuit is controlled according to the real-time rotating speed value of the fan.

9. The washer drying method according to any one of claims 1 to 5, wherein: the drying efficiency is calculated by H ═ X-X0/T, where X is humidity data obtained by current sampling, X0 is initial humidity data when drying operation is started, and T is a time difference between the current time and the time when drying operation is started.

10. A washer to which the washer drying method of any one of claims 1 to 9 is applied, characterized in that: including organism and the drying system of setting in the organism, drying system includes control circuit board, is used for detecting the humidity transducer of the internal humidity of cleaning machine cavity, to the fan of the internal air supply of cleaning machine cavity, set up the heating element at the fan front end, humidity transducer, fan, heating element respectively with control circuit board signal connection, last speed governing circuit that is used for adjusting the fan rotational speed that is provided with of control circuit board and the voltage control circuit who is used for adjusting heating element supply voltage.

Technical Field

The invention relates to the technical field of cleaning machines, in particular to a drying method of a cleaning machine and the cleaning machine applying the drying method of the cleaning machine.

Background

The prior cleaning device such as a dish washer can also carry out drying and sterilizing after cleaning. For example, the present invention discloses a drying and sterilizing structure of a dishwasher in a chinese utility model with an authorized publication number CN209346958U (application number 201821154118.X) and a novel dishwasher in a chinese invention patent with a publication number CN111956147A (application number 202010634405.6), wherein the disclosed dishwashers are both provided with a heating element and a fan, the heating element is disposed at an outlet of the fan, so that hot air can be blown into a cavity of the dishwasher to achieve drying and sterilizing effects. But the fan among these dish washers usually works with fixed rotational speed at present, and the fan can reach the effect of blowing in hot-blast to the dish washer cavity on the one hand, and on the other hand also can be for heating element cools down, prevents that heating element high temperature from leading to heating element parts around to receive the influence or damage. And in order to avoid the disconnection work of heating element when the high temperature, set up the relay respectively corresponding to live wire and zero line that heating element connects usually, the relay takes place the adhesion and leads to the risk of unable disconnection when avoiding the high temperature. In the working method, the fixed rotating speed of the fan cannot adapt to the temperature change condition of the heating element, so that the drying time is prolonged. In addition, the heating element can not be effectively remedied when in failure, resulting in poor drying effect. And the cost of providing two relays is high and the maintenance cost is also high.

Disclosure of Invention

The first technical problem to be solved by the present invention is to provide a drying method for a cleaning machine, which can ensure the safe operation of a heating element and ensure the optimal drying efficiency, in view of the above prior art.

The second technical problem to be solved by the present invention is to provide a cleaning machine with low risk of dry burning and low cost in view of the above prior art.

The technical scheme adopted by the invention for solving the first technical problem is as follows: a drying method of a cleaning machine is characterized in that: after the drying operation is started, controlling a fan blowing air into the cavity of the cleaning machine to operate according to a set rotating speed, and simultaneously acquiring the real-time rotating speed of the fan and humidity data in the cavity of the cleaning machine in real time so as to calculate the current drying efficiency according to the humidity data;

comparing the current real-time rotating speed of the fan with the set rotating speed, comparing the current drying efficiency with the set drying efficiency, and heating the heating power of the element or adjusting the rotating speed of the fan according to the comparison result.

As an improvement, comparing the current real-time rotating speed N of the fan with a set rotating speed N0, if N0-N is less than E, judging that the rotating speed of the fan is normal, otherwise, judging that the rotating speed of the fan is reduced, wherein E is a set rotating speed error value, and E is more than 0;

when the rotating speed of the fan is normal, the power of a heating element for heating the cavity of the cleaning machine is adjusted according to the real-time rotating speed N of the fan in a matching manner, and then hot air is blown into the cavity of the cleaning machine to perform drying work;

when the rotating speed of the fan is judged to be reduced, the set rotating speed value of the fan is increased, and the heating power of the heating element is reduced;

when the rotating speed of the fan is normal and the drying efficiency is smaller than the set drying efficiency, the heating element is judged to be invalid, and then the rotating speed of the fan is controlled to be increased.

In order to enable the heating power of the heating element to be matched with the rotating speed of the fan and avoid the situation of overhigh temperature in the cavity of the cleaning machine, after the heating element is judged to be invalid, the actual rotating speed value of the fan is obtained while the rotating speed of the fan is controlled to be increased, and the heating power of the heating element is obtained according to the real-time rotating speed value after the fan is adjusted.

Preferably, when the heating element is judged to be failed, the rotating speed of the fan is gradually increased according to the set unit adjustment amount until the rotating speed of the fan reaches the maximum value or the drying efficiency reaches the set drying efficiency.

In order to avoid the condition that the rotating speed of the fan is reduced under the condition that the heating element is failed, when the heating element is judged to be failed, the heating power of the heating element is reduced, meanwhile, the heating element is controlled to perform heating work discontinuously, and the discontinuous time of the heating element in one working cycle is determined according to the drying efficiency.

In order to eliminate the condition that the rotating speed of the fan is reduced due to non-performance reduction, the heating element is controlled to be closed under the condition that N0-N is less than E, the fan is restarted, and if the restarting frequency of the fan reaches a first set frequency and still meets the condition that N0-N is less than E, the rotating speed of the fan is judged to be reduced.

In order to eliminate the condition that the heating power of the heating element is reduced due to non-performance reduction, when the rotating speed of the fan is normal and the drying efficiency is smaller than the set drying efficiency, the heating element is restarted, and if the number of times of restarting the heating element reaches a second set number of times and the drying efficiency is still smaller than the set drying efficiency, the heating element is judged to be invalid.

Conveniently, the calorific capacity of heating element is adjusted through silicon controlled chopper circuit, according to the real-time rotational speed value control silicon controlled chopper circuit's PWM duty cycle of fan.

Simply, the drying efficiency is calculated as H ═ X-X0/T, where X is the humidity data obtained by current sampling, X0 is the initial humidity data when the drying operation is started, and T is the time difference between the current time and the time when the drying operation is started.

The technical scheme adopted by the invention for solving the second technical problem is as follows: a washer applying the washer drying method of the preceding claim, characterized in that: including organism and the drying system of setting in the organism, drying system includes control circuit board, is used for detecting the humidity transducer of the internal humidity of cleaning machine cavity, to the fan of the internal air supply of cleaning machine cavity, set up the heating element at the fan front end, humidity transducer, fan, heating element respectively with control circuit board signal connection, last speed governing circuit that is used for adjusting the fan rotational speed that is provided with of control circuit board and the voltage control circuit who is used for adjusting heating element supply voltage.

Compared with the prior art, the invention has the advantages that: according to the drying method of the cleaning machine, the rotating speed of the fan and the heating power of the heating element can be adjusted according to the rotating speed condition of the fan and the drying efficiency condition in the cleaning machine, so that the rotating speed of the fan is matched with the heating power of the heating element, the heating element is prevented from being burnt in a dry mode on the basis of effectively ensuring the optimal drying efficiency, the condition of overhigh temperature is avoided, the reasonable working time of the drying work is ensured on the basis of ensuring the safe operation of the drying work, and the user experience is improved. Meanwhile, in the method, the fan does not need to be kept in a full-load working state all the time, and the service life of the fan is prolonged.

The drying work of the cleaning machine applying the method is safer, more reliable and more effective.

Drawings

Fig. 1 is a flowchart of a drying method of a washer according to an embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

As shown in fig. 1, the drying method of the washer in the present embodiment is implemented by a washer having a drying system. The cleaning machine in the embodiment comprises a machine body and a drying system arranged in the machine body, wherein the drying system comprises a control circuit board, a humidity sensor used for detecting the humidity in a cavity of the cleaning machine, a fan used for supplying air to the cavity of the cleaning machine and a heating element arranged at the front end of the fan, the humidity sensor, the fan and the heating element are respectively in electric signal connection with the control circuit board, and the control circuit board is provided with a speed regulating circuit used for regulating the rotating speed of the fan and a voltage regulating circuit used for regulating the power supply voltage of the heating element.

The heating element may be any heater in the prior art, and the heating element in this embodiment is a PTC heating element. The speed regulating circuit on the control circuit board can adopt a PWM speed regulating circuit in the prior art to realize the regulation of the rotating speed of the fan, namely, the PWM duty ratio is regulated to realize the regulation of the rotating speed of the fan. The voltage regulating circuit can adopt a silicon controlled chopper circuit in the prior art, and further realize the control of the heating value of the heating element.

The drying method of the cleaning machine in the embodiment is as follows: after the drying operation is started, controlling a fan blowing air into the cavity of the cleaning machine to operate according to a set rotating speed, and simultaneously acquiring the real-time rotating speed of the fan and humidity data in the cavity of the cleaning machine in real time so as to calculate the current drying efficiency according to the humidity data; comparing the current real-time rotating speed of the fan with the set rotating speed, comparing the current drying efficiency with the set drying efficiency, and heating the heating power of the element or adjusting the rotating speed of the fan according to the comparison result.

The drying method of the cleaning machine specifically comprises the following steps.

And S1, after the cleaning machine finishes cleaning, entering a drying working procedure.

And S2, controlling the fan to work according to the set rotating speed Ns, wherein the maximum rotating speed value Nmax of the fan is stored in a control circuit board of the drying system, and Ns is less than Nmax.

S3, the control chip in the control circuit board obtains the real-time rotation speed N of the fan in real time, the fan in this embodiment may adopt a motor capable of feeding back rotation speed information, and the control circuit board compares the real-time rotation speed N of the fan with the set rotation speed Ns of the fan after obtaining the real-time rotation speed N of the fan.

S4, judging whether N0-N is less than E or not, wherein E is a set rotating speed error value, E is more than 0, and the value of E is set according to different cleaning machine bodies and can be obtained through experiments in the research and development stage of the cleaning machine and stored in a control circuit board;

if so, judging that the rotating speed of the fan is normal, and then conducting S5;

if not, the fan rotation speed is judged to be reduced, and S8 is further carried out.

In order to avoid that the normal drying operation is affected by the condition that the rotating speed of the fan is reduced temporarily due to non-fan performance reasons, in the embodiment, the heating element is controlled to be closed, the fan is restarted, and if the restarting frequency of the fan reaches a first set frequency and still meets the condition that N0-N is less than E, the rotating speed of the fan is judged to be reduced.

S5, adjusting the power of a heating element for heating the cavity of the cleaning machine according to the real-time rotating speed N of the fan in a matching mode, and further blowing hot air into the cavity of the cleaning machine to perform drying work. So can be more accurate control heating element's calorific capacity and the rotational speed phase-match of fan, the maximum possible avoids appearing calorific capacity too big and leads to the too high condition of temperature. In this embodiment, the PWM duty cycle of the thyristor chopper circuit is adjusted to match the rotational speed of the fan, and the PWM duty cycle of the thyristor chopper circuit is adjusted to Ns/N, so that the heating element is in a full-effect operation state.

S6, acquiring humidity data X in the cavity of the cleaning machine in real time, and calculating the drying efficiency H according to the humidity data X acquired in real time and initial humidity data X0 stored in the control circuit board when the drying operation is started, wherein H is (X-X0)/T, and T is the time difference between the current moment and the moment when the drying operation is started.

The calculated drying efficiency H is compared with the set drying efficiency H0, and if H < H0, it is judged that the heating element is failed, S7 is performed.

In order to avoid the decrease of the drying efficiency caused by the performance decrease of the non-heating element, in this embodiment, the heating element is restarted, and if the drying efficiency is still less than the set drying efficiency when the number of times of restarting the heating element reaches the second set number of times, it is determined that the heating element is failed.

S7, controlling to increase the rotating speed of the fan, and further achieving the set drying efficiency through increasing the rotating speed of the fan. Because the condition that the performance of the heating element is reduced cannot be determined, the rotating speed of the fan can be gradually increased according to the set unit regulating quantity until the rotating speed of the fan reaches the maximum value or the drying efficiency reaches the set drying efficiency. And at the moment, acquiring the real-time rotating speed value N of the fan in real time, and simultaneously adjusting the heating power of the heating element according to the adjusted real-time rotating speed value N, namely reducing the heating power of the heating element. In the embodiment, the heating power of the heating element is reduced by adjusting the PWM duty ratio of the silicon controlled chopper circuit, and the heating power of the heating element is reduced by adjusting the PWM duty ratio of the silicon controlled chopper circuit to N/Nmax. So can prevent the risk that brings when the rotational speed also appears in the fan when heating element became invalid in the course of the work, in order to further avoid this risk, control heating element and be interrupted the heating work to according to the off-time of drying efficiency determination heating element in a duty cycle.

S8, increasing the set rotating speed value of the fan and reducing the heating power of the heating element;

the set rotating speed value of the fan is increased to Nmax in the embodiment, the real-time rotating speed value N of the fan is obtained in real time on the basis, the heating power of the heating element is adjusted according to the real-time rotating speed N of the fan, the PWM duty ratio of the silicon controlled chopper circuit is adjusted to N/Nmax correspondingly in the embodiment, the heating value of the heating element is reduced, and the safe drying operation is guaranteed.

And S9, when the humidity in the cavity of the cleaning machine is detected to be smaller than the set humidity threshold value, finishing the drying work, and controlling to close the heating element and the fan.

The drying method of the cleaning machine provided by the invention adjusts the heating power of the heating element through the feedback of the rotating speed of the fan, greatly reduces the risk of dry burning of the heating element, improves the utilization efficiency of the heating element, and can play a role in saving electricity.

In addition, the rotating speed of the fan is adjusted according to the feedback of the humidity condition of the cavity of the cleaning machine, and the drying effect can be guaranteed even if the heating element fails and cannot reach the required drying temperature.

Utilize silicon controlled rectifier chopper circuit control heating element in this embodiment, save the cost that two relays need, avoid the frequent break-make of relay, increase the life-span of the components and parts of control heating element work.

The drying method does not depend on a temperature controller, the situation of overhigh temperature is prevented in design, the method avoids the situation of powering off again under the situation of overhigh temperature, and the protection of components in the cleaning machine is reduced.