WO2018040931A1

WO2018040931A1 - Dryness determination method for clothes dryer

Info

Publication number: WO2018040931A1
Application number: PCT/CN2017/097874
Authority: WO
Inventors: 宋华诚; 许升; 田书君; 赵志强
Original assignee: 青岛海尔滚筒洗衣机有限公司
Priority date: 2016-08-29
Filing date: 2017-08-17
Publication date: 2018-03-08
Also published as: CN106854827A; CN106854827B

Abstract

A dryness determination method for a clothes dryer. The method comprises: when clothes drying is started, detecting temperatures of different positions in a clothes drying cylinder (1), and according to the detected temperature differences, determining whether or not the clothes drying is completed. Furthermore, the detection of the temperatures of the different positions in the clothes drying cylinder (1) comprises: detecting temperatures of M*N positions in the clothes drying cylinder (1) by an infrared temperature sensor (2) in a matrix manner, and specifically, comparing the detected temperature values with an out-of-cylinder temperature to determine whether or not the clothes drying is completed, or obtaining a difference between the maximum value and the minimum value of the detected temperatures, and when the difference value falls within a pre-set range, determining that the clothes drying is completed. During the clothes drying process, the detection is performed many times, and when it is detected that temperature differences between temperature measurement points change from large to small or that a temperature reduction rate of the measurement points changes from large to small, it is determined that the clothes are dry. The dryness determination method is high in accuracy of determination, protects clothes from being scalded, dries the clothes uniformly and improves the efficiency of the clothes drying.

Description

Method for drying clothes dryer

Technical field

The invention relates to a drying device, in particular to a dryer, in particular to a drying machine.

Background technique

Dryer, as its name implies, is a device for drying clothes. The advent of dryers has brought great convenience to people's lives, enabling people to get dry clothes on rainy days.

In a clothes drying mechanism for a clothes dryer or a washer-dryer, a device for generating heated air mostly adopts a heating method of heating air by a heater. The existing electric dryers generally use a heating wire or a heating tube as a heat source, and such products have high energy consumption, long drying time and poor safety. In order to reduce energy consumption, a heat pump dryer has been developed, which uses a heat pump system to enhance the recycling of heat, improve heat utilization efficiency, and reduce power consumption.

At present, there are mainly three methods for judging the dryer: 1) The method for directly testing the moisture content of the clothes by the moisture sensor of the clothes, the humidity sensor of the clothes is divided into a resistive type and a capacitive type, and different humiditys correspond to different resistance values or The value of the control method requires a large number of tests to verify and match, but the clothing humidity sensor has a characteristic that the resistance value or the capacitance value will drift as the usage time increases, thus causing the test value and the actual value. There are deviations. In addition, in actual use, there will be cases where the judgment is not accurate. For example, if the load is wrapped by a large object, the large object is already dry, but the wrapped load is still wet, so the failure will cause the load to dry insufficiently. In the case of abnormal conditions, when the small clothes are dry, the chance of the clothes contacting the sensor is small, which may result in inaccurate measurement results, and it is easy to misjudge that the clothes have dried. Or when the clothes of uneven thickness such as jeans are dried, the fabric of the detecting part is already dry, and the overlapping parts of the hem leg and the pocket are not completely dried after the end of the original testing procedure; 2) the air entering and exiting the drying cylinder is detected The temperature and the outlet air temperature are judged. When the temperature difference between the inlet air temperature and the outlet air temperature reaches a certain set value, the delay period is further delayed, and the drying process ends; 3) the outlet air outlet temperature and the air outlet of the drying cylinder are tested. Humidity comprehensively judges the end condition of the dryer.

The method of using the temperature sensor to determine the degree of dryness of the load is relatively simple, and is to run a set drying time or a set temperature under a standard environmental standard capacity load. For example, a drum dryer with a rated power of 1600W and a rated capacity of 6kg uses a standard energy consumption program to dry a standard 6kg cotton load to a final moisture content of 4%. The program is set to run for 180 minutes or the outlet temperature. Set 50 °C, when the running time or the outlet temperature reaches any of the set values, the dryer stops heating. This method requires strict implementation of the type and quality of the clothes. However, when using the dryer, the type, quality, and initial moisture content of the clothes placed in the drum are uncertain, so the judgment accuracy of the dryer is required. Very high, Failure to do so may result in the drying of the clothes, or the drying time may be too long, which may cause the user to use the expected deviation.

The Chinese patent application No. CN201020104047.X discloses an intelligent fuzzy control device for the drying process based on the weighing method. The intelligent fuzzy control device continuously determines the load weight and determines the dryness of the load through a fuzzy algorithm. The intelligent fuzzy control device has a narrow use range. When the drying cylinder is in operation, the drying cylinder is in a continuous rotation state or the stopping time is very short, which adds great difficulty to the measurement weight, and the measurement result also has a certain error.

The Chinese patent application No. CN200910210029.1 discloses a control method of a heat pump dryer and a heat pump dryer. The control method comprises the following steps: providing a drying chamber for controlling the gas discharged from the drying chamber to discharge the heat pump. In addition to the clothes machine, it is judged whether the action of the drying chamber conforms to a predetermined condition. If the operation of the drying chamber meets the predetermined conditions, the gas leaving the drying chamber is controlled to flow back to the drying chamber. The control method is to measure the humidity of the clothes and the absolute moisture content of the intake air, the absolute moisture content of the air, the inlet air temperature, the return air temperature, the inlet air and the return air temperature, etc., and the control method also exists due to use. The measurement deviation caused by long time, which in turn affects the working performance of the dryer.

The present invention has been made in view of the above.

Summary of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, and to provide a drying machine having a high judgment precision, protecting clothes from scalding, uniform drying, and good effect.

In order to solve the above technical problem, the basic idea of adopting the technical solution of the present invention is: a method for dry-drying the machine, comprising: starting the dry clothes, detecting the temperature at different positions in the dry clothes, and determining whether the clothes are different according to the detected temperature difference. Drying is complete.

Further, detecting the temperature at different positions in the drying cylinder comprises: detecting the temperature of the M*N positions in the drying cylinder in a matrix by an infrared temperature sensor.

The infrared temperature sensor has a plurality of infrared measuring points, and the temperature of each point is detected in a matrix manner. The selection of M and N is related to the model of the infrared temperature sensor, preferably 8*8-32*32. The invention measures the drying of the laundry by using a non-contact infrared sensor to measure a plurality of temperature points in the cylinder, and the measurement is more accurate.

Further, determining whether the laundry is dry according to the detected temperature difference comprises: obtaining the detected minimum value of the temperature and comparing with the outlet temperature, when the detected minimum value is greater than or equal to the outlet temperature or the comparison difference Within the preset range, the laundry is dried;

Preferably, the outlet temperature is the temperature value within the detected dry cylinder that is closest to the outlet position.

Further, determining whether the laundry is dry according to the detected temperature difference comprises: comparing a temperature minimum value in at least one column of the selection matrix with a discharge cylinder temperature, and when the detected temperature minimum value is greater than or equal to a discharge cylinder temperature or a comparison difference Value When it falls within the preset range, the laundry is dried;

Preferably, the temperature minimum in either column is selected to be compared with the outlet temperature; more preferably, the temperature minimum in either column is selected to be compared to the outlet temperature.

Further, determining whether the laundry is dried according to the detected temperature difference comprises: obtaining a maximum value and a minimum value of the detected temperature and obtaining a difference, and when the difference falls within a preset range, the laundry drying is completed.

Further, determining whether the laundry is dried according to the detected temperature difference comprises: obtaining a maximum value and a minimum value of the temperature in at least one row in the matrix and obtaining a difference, and when the difference falls within a preset range, the laundry drying is completed.

Further, determining whether the laundry is dried according to the detected temperature difference comprises: performing multiple measurements during the drying process, and detecting that the temperature difference of the temperature measurement point changes from large to small or the temperature decrease rate of the measurement point changes from large to large Small, it is judged that the clothes are dry.

Further, the drying clothes start, first determine the amount of clothing, specifically:

After the drying clothes are executed for a set time, the temperature at different positions in the drying cylinder is detected, and when the detected low temperature number is less than the set value, the amount of the laundry is judged to be small, otherwise, the amount of the laundry is judged to be large.

Wherein, the low temperature point is a point at which the temperature measurement point is lower than the temperature of the surrounding measurement point, or the average value of the maximum value and the minimum value detected by each measurement point in the dry cylinder is first calculated, and the detection temperature value is defined as lower than the average value. The measurement point is the low temperature point.

Further, before detecting the temperature in different positions in the drying cylinder, the heating is stopped first, the laundry is naturally cooled or the cold air is cooled to cool the laundry for a set time, and then the temperature is detected;

Preferably, the manner of providing cold air to cool the temperature inside the drying cylinder comprises: indirectly cooling the drying air by means of a condenser, or directly supplying cold air into the drying cylinder.

Further, in the detection process, if the temperature difference of the measurement point is not found in the temperature detection multiple times, it is determined according to the speed of the temperature drop after the cold air is blown, and the change value of the detected temperature drop in the set time period is compared with the set threshold value. If it is greater than the set threshold, it is judged that the humidity is large, the drying is not completed, otherwise the drying is completed, and the threshold value is related to the amount of the laundry and the temperature difference between the inside and the outside of the drying cylinder.

Further, before determining whether the laundry is dried according to the detected temperature difference, the method further comprises: monitoring the humidity of the laundry, and when the humidity reaches the preset value of the humidity, detecting the temperature of the different positions in the drying cylinder, and according to the detected The difference in temperature determines whether the laundry is dry or not.

Further, after the drying starts, the clothing is started when the temperature near the outlet of the drying cylinder reaches the preset temperature value. Dry judgment.

After adopting the above technical solution, the present invention has the following advantageous effects compared with the prior art.

The invention detects the temperature of different positions in the dry clothes cylinder, that is, can detect the temperature of different parts of the clothes, obtains the uniformity of drying of the clothes according to the detected temperature difference, and further determines whether the clothes are dried or not, especially for drying some thicknesses. Uneven clothes such as jeans have a very good drying effect, which can avoid the situation where the clothes are not dried and complete the drying, and also avoid the damage caused by the clothes drying time.

The invention also stops the heating of the clothes in the drying cylinder first, and then detects the temperature of each point after the temperature is lowered in the cylinder, and judges whether the laundry is dried according to the detected temperature difference, and the temperature difference includes the temperature of the detecting point itself. The change in the speed of the drop, the change in the temperature difference between the points, the change in the temperature at the detection point, and the difference in the set parameter or the outlet temperature can all determine whether the laundry is dry.

The specific embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

DRAWINGS

The drawings are intended to provide a further understanding of the invention, and are intended to be illustrative of the invention. It is apparent that the drawings in the following description are only some embodiments, and other drawings may be obtained from those skilled in the art without departing from the drawings. In the drawing:

Figure 1 is a schematic view of a clothes dryer of the present invention;

In the figure: 1, dry clothes tube; 2, infrared temperature sensor; 3, clothing injection port; 4, heater.

It is to be understood that the drawings and the written description are not intended to limit the scope of the present invention in any way.

detailed description

The embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is not intended to limit the scope of the invention.

In the drying machine of the present invention, after the drying is started, the temperature at different positions in the drying cylinder is detected, and whether the laundry is dried or not is determined according to the detected temperature difference.

Preferably, the infrared temperature sensor 2 detects the M*N positions in the dry cylinder in a matrix manner by infrared detection. The temperature is measured to detect the difference in temperature between different parts of the clothes in the dry clothes cylinder, and it is judged whether all parts of the clothes have been dried, that is, whether the clothes are uniformly dried, thereby judging whether the clothes in the drum are dry or not.

As shown in FIG. 1, the infrared temperature sensor 2 is installed on the front upper side of the drying cylinder 1, that is, above the laundry injection port 3, and has a plurality of infrared measuring points, which can detect the temperature values of the M*N positions in the opposite cylinder. The selection of M and N is related to the model of the infrared temperature sensor and also to the capacity of the dryer cylinder 1. The invention adopts the non-contact infrared sensing to measure the temperature of the 8*8 or 16*16 in the cylinder to judge the drying of the laundry, and the measurement is more accurate. Taking the 8*8 matrix detection temperature as an example, but not limited to the 8*8 matrix detection temperature, as shown in the following table, Tij represents the temperature of the measurement point of the i-th row and the j-th column, 1≤i, j≤8. When the temperature is detected, the dryer drying cylinder stops rotating, so that the laundry is in a stable state when the temperature is detected, and the detection accuracy is improved.

T11T11	T12T12	T13T13	T14T14	T15T15	T16T16	T17T17	T18T18
T21T21	T22T22	T23T23	T24T24	T25T25	T26T26	T27T27	T28T28
T31T31	T32T32	T33T33	T34T34	T35T35	T36T36	T37T37	T38T38
T41T41	T42T42	T43T43	T44T44	T45T45	T46T46	T47T47	T48T48
T51T51	T52T52	T53T53	T54T54	T55T55	T56T56	T57T57	T58T58
T61T61	T62T62	T63T63	T64T64	T65T65	T66T66	T67T67	T68T68
T71T71	T72T72	T73T73	T74T74	T75T75	T76T76	T77T77	T78T78
T81T81	T82T82	T83T83	T84T84	T85T85	T86T86	T87T87	T88T88

Embodiment 1

In this embodiment, the detected temperature value is compared with the outlet temperature to determine whether the laundry is dry or not. Specifically:

After the start of the drying, when the temperature near the exit of the dryer cylinder is detected to be higher than the preset temperature value, for example, 35 ° C, the uniformity of laundry drying is judged. After the clothes are evenly dried, the temperature of the clothes in the cylinder will gradually decrease from the air inlet to the air outlet. Since the water absorbs heat during the evaporation process, the local temperature is lower than the outlet temperature. Therefore, if the local temperature in the detection cylinder is less than The outlet air temperature indicates that the laundry in the local portion contains water that has not been evaporated, and it is judged that the laundry is not dried; if the detected minimum temperature is greater than the outlet temperature, it is determined that the laundry is evenly dried and the drying is completed.

Or, in order to shorten the drying time, the above precise drying method is not required, and a certain amount of deviation is allowed. For example, the difference between the temperature of each measuring point in the cylinder and the temperature of the outlet cylinder ∣ ΔT ∣ is less than 1 ° C, and the clothing is determined. Dry evenly.

Embodiment 2

This embodiment is a simplified judgment of the first embodiment: the temperature of one column in the matrix is selected, for example, the fourth column is detected. The volume point temperature value Ti4 is compared with the outlet temperature, and if the difference ∣ΔT∣ is less than 1 ° C, it is judged that the laundry is dry.

In this embodiment, the temperature minimum value in at least two columns in the matrix may be selected to be compared with the outlet temperature. When the detected minimum temperature is greater than or equal to the outlet temperature or the compared difference falls within a preset range, then The clothes are dry and finished.

The outlet temperature of the present invention may be the outlet temperature detected by the separately provided temperature sensor, or the infrared temperature sensor may detect the temperature value closest to the outlet position.

Embodiment 3

In this embodiment, the difference between the maximum value and the minimum value of the detected temperature is determined, and when the difference falls within the preset range, it is judged that the drying of the laundry is completed.

Preferably, the maximum value and the minimum value of the temperature in at least one row of the matrix are acquired and the difference is obtained. When the difference falls within the preset range, the laundry drying is completed.

The minimum value Tmin(i) of the measurement point temperature in the i-th row is compared with the maximum value Tmax(i) of the row to calculate a difference. If the difference is less than ∣ΔTi∣, for example, ∣ΔTi∣ is set to 1 °C, then Make sure the clothes are dry.

Further, in order to simplify the judgment, the temperature of the intermediate position may be selected for determination. For example, the minimum temperature value Tmin(4) of the fourth line is detected and compared with the maximum value Tmax(4) of the line. If the difference is smaller than ∣ΔT4∣, When ∣ΔT4∣ is set to 1 °C, it is judged that the laundry is dry.

Embodiment 4

This embodiment is an improvement of the above embodiment. During the drying process, a plurality of measurements are performed. When it is detected that the temperature difference of the temperature measurement point is changed from large to small, or the temperature decrease rate of the measurement point is changed from large to small, the clothing is judged. dry.

Embodiment 5

Since the amount of the laundry also affects the effect of the laundry, the embodiment needs to determine the amount of the laundry, specifically:

After the start of the drying, the drying is not judged first, the amount of the clothes is first determined, and after the set time of the drying clothes is set, the temperature at different positions in the drying cylinder is detected, and when the number of detected low points is less than the set value, the amount of the clothes is judged. Less, otherwise, judge the amount of clothing.

Embodiment 6

The invention stops heating before detecting the temperature in different positions in the drying cylinder, and relies on natural cooling of the clothes or providing cold air. The temperature is detected after cooling the laundry for a set time, because the moist laundry absorbs heat due to evaporation of moisture in the laundry when the heating is stopped, and the temperature is lowered faster than the portion of the drying cylinder that is not covered by the laundry.

This embodiment is performed before the above embodiment detects the amount of laundry and each time the laundry is judged to be dried, first stops heating, cools the temperature inside the cylinder, and then detects the laundry or judges whether or not the drying is completed.

Example 7

In the detection process, if the temperature difference of the measurement point described in the above embodiment is not found in the temperature detection, the determination needs to be based on the speed of the temperature drop after the cold air, and the temperature is detected within the set time period. The change value is compared with the set threshold. If it is greater than the set threshold, the humidity is judged to be large, and the drying is not completed. Otherwise, the drying is completed, and the set threshold is related to the amount of the laundry and the temperature difference between the inside and the outside of the drying cylinder.

Example eight

On the basis of the above embodiment, the present embodiment cooperates with the humidity detection to determine whether the drying is completed: monitoring the humidity of the clothes, and when the humidity reaches the preset value of the humidity, detecting the temperature at different positions in the drying cylinder, and detecting the temperature according to the detection. The difference in temperature determines whether the laundry is dry or not.

The dry clothes dryer of the present invention starts, after heating for 5-10 minutes, the heater 4 stops heating, relies on natural cooling or indirectly cools the dry air by using a condenser, or directly supplies cold air to the dry clothes barrel 1, if detected If the temperature is low, it is considered that there is less clothing in the dryer. Otherwise, the number of clothes in the dryer is considered to be large. Here, the average value of the maximum and minimum values of all the measurement points can be used as the division interval between the high and low temperatures. point.

After judging the amount of laundry, the heater 4 continues to heat. When the temperature of the cylinder is detected to be higher than 35 ° C, it is judged whether the laundry is dry. During the operation of the dryer, multiple measurements can be made. When the heating is stopped, the temperature in the cylinder is cooled. After that, the temperature point is detected from the previous unevenness and becomes uniform, and it can be judged that the laundry is dried.

Unevenness refers to the temperature value of the measuring point, which is 1 °C lower than the value of the adjacent temperature point. It is considered that this area is different from the dryness of other areas due to the influence of moisture.

If the temperature difference is not found in the temperature detection several times during the detection process, the drying degree of the clothes is relatively uniform, and the difference cannot be determined even by the cold air. In this case, it is necessary to determine the speed at which the temperature is lowered after the cold air is blown. The higher the humidity, the faster the temperature is lowered, and the clothes are judged to be dry depending on the speed of the temperature drop. The determination of the speed of the temperature drop can be set to a different threshold depending on the amount of the laundry and the temperature of the air outside the cylinder.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention, and any technology that is familiar with the present patent. Those skilled in the art can make some modifications or modifications to equivalent embodiments by using the technical content of the above-mentioned hints without departing from the technical scope of the present invention, but the technology according to the present invention does not deviate from the technical solution of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments are still within the scope of the present invention.

Claims

A method for dry-drying machine, characterized in that it comprises:

The drying starts, the temperature at different positions in the drying cylinder is detected, and it is judged whether the laundry is dry or not according to the detected temperature difference.
The dryer drying method according to claim 1, wherein detecting the temperature at different positions in the drying cylinder comprises:

The temperature of the M*N positions in the dry cylinder is detected in a matrix by an infrared temperature sensor.
The dryer drying method according to claim 1, wherein determining whether the laundry is dried according to the detected temperature difference comprises:

Obtaining the detected minimum temperature and comparing with the outlet temperature, when the detected minimum temperature is greater than or equal to the outlet temperature or the compared difference falls within a preset range, the laundry drying is completed;

Preferably, the outlet temperature is the temperature value within the detected dry cylinder that is closest to the outlet position.
The dryer drying method according to claim 2, wherein determining whether the laundry is dried according to the detected temperature difference comprises:

Selecting a temperature minimum value in at least one column of the matrix to be compared with the outlet temperature, and when the detected minimum temperature is greater than or equal to the outlet temperature or the compared difference falls within a preset range, the laundry drying is completed;

Preferably, the temperature minimum in either column is selected to be compared with the outlet temperature; more preferably, the temperature minimum in either column is selected to be compared to the outlet temperature.
The dryer drying method according to claim 1, wherein determining whether the laundry is dried according to the detected temperature difference comprises:

The maximum and minimum values of the detected temperature are acquired and the difference is obtained. When the difference falls within the preset range, the laundry is dried.
The dryer drying method according to claim 2, wherein determining whether the laundry is dried according to the detected temperature difference comprises:

The maximum value and the minimum value of the temperature in at least one row in the matrix are obtained and the difference is obtained. When the difference falls within the preset range, the laundry is dried.
The dryer drying method according to claim 1, wherein determining whether the laundry is dried according to the detected temperature difference comprises: performing a plurality of measurements during the drying process, and detecting the temperature of the temperature measuring point When the difference is changed from large to small or the temperature decrease rate of the measurement point is changed from large to small, the laundry is judged to be dry.
The method for determining the dryness of a clothes dryer according to any one of claims 1 to 7, wherein the drying of the clothes starts, and the amount of the clothes is first determined, specifically:

After the drying clothes are executed for a set time, the temperature at different positions in the drying cylinder is detected, and when the detected low temperature number is less than the set value, the amount of the laundry is judged to be small, otherwise, the amount of the laundry is judged to be large.

Wherein, the low temperature point is a point at which the temperature measurement point is lower than the temperature of the surrounding measurement point, or the average value of the maximum value and the minimum value detected by each measurement point in the dry cylinder is first calculated, and the detection temperature value is defined as lower than the average value. The measurement point is the low temperature point.
The drying method of the clothes dryer according to any one of claims 1 to 8, characterized in that before the temperature in different positions in the drying cylinder is detected, the heating is stopped, the laundry is naturally cooled or the cold air is cooled to cool the laundry for a set time. Detecting temperature;

Preferably, providing cold air cooling comprises: using a condenser to indirectly cool the dry air heat exchange, or directly supplying cold air into the dry clothes cylinder.
The method for determining the dryness of a clothes dryer according to claim 9, wherein in the detecting process, if the temperature difference of the measuring point is not found in the plurality of temperature detections, the determination is made according to the speed of the temperature drop after the cold air is set, and the setting is made. The change value of the detected temperature drop in the time period is compared with the set threshold value. If it is greater than the set threshold value, the humidity is judged to be large, the drying is not completed, otherwise the drying is completed, the threshold value and the amount of the laundry are set, and the temperature difference between the inside and the outside of the drying cylinder is set. related.
The drying method of the clothes dryer according to any one of claims 1 to 10, characterized in that, before determining whether the laundry is dried according to the detected temperature difference, the method further comprises: monitoring the humidity of the laundry, when the humidity reaches the humidity preset At the time of the value, the temperature at different positions in the dry cylinder is detected, and it is judged whether the laundry is dry or not according to the detected temperature difference.
The drying method of the clothes dryer according to any one of claims 1 to 11, characterized in that, after the start of the drying, when the temperature near the outlet of the drying cylinder is detected to reach a temperature preset value, the judgment of the laundry drying is started.