阅读说明：本技术 一种干衣机滤网堵塞检测方法及干衣机 (Clothes dryer filter screen blockage detection method and clothes dryer ) 是由 黎辉 章发 张晓亮 熊衡 于 2020-03-27 设计创作，主要内容包括：本发明提供了一种干衣机滤网堵塞检测方法及干衣机,包括步骤：S1,干衣机开始运行；S2,每隔一定时间获取一次冷凝器出口冷媒温度tcond和干衣机连续运行时间y；S3,判断所述y是否满足第一预设条件；和/或,所述tcond是否满足第三预设条件；若是,则继续执行步骤S4；S4,获取当前冷凝器进口的冷媒温度tcomp和当前冷凝器出口的冷媒温度tcond；S5,计算当前tcomp-tcond的值；S6,判断当前tcomp-tcond的值是否满足第二预设条件；若是,则干衣机暂停运行,提醒用户清理滤网；本发明所述的干衣机滤网堵塞检测方法及干衣机具有检测方法简单、准确性高、实时性好的优点。(The invention provides a method for detecting blockage of a filter screen of a clothes dryer and the clothes dryer, comprising the following steps: s1, the clothes dryer starts to operate; s2, acquiring the condenser outlet refrigerant temperature tcond and the continuous operation time y of the clothes dryer at regular intervals; s3, judging whether y meets a first preset condition; and/or whether tcond meets a third preset condition; if yes, go to step S4; s4, acquiring the temperature tcomp of a refrigerant at the inlet of the current condenser and the temperature tcond of the refrigerant at the outlet of the current condenser; s5, calculating the value of current tcomp-tcond; s6, judging whether the current value of tcomp-tcond meets a second preset condition; if so, the clothes dryer stops running to remind a user of cleaning the filter screen; the clothes dryer filter screen blockage detection method and the clothes dryer have the advantages of simplicity in detection method, high accuracy and good real-time performance.)

1. A method for detecting blockage of a filter screen of a clothes dryer is characterized by comprising the following steps:

s1, the clothes dryer starts to operate;

s2, acquiring the condenser outlet refrigerant temperature tcond of the clothes dryer and the continuous clothes dryer operation time y at regular intervals;

s3, judging whether the continuous operation time y of the clothes dryer meets a first preset condition or not; and/or whether the condenser outlet temperature tcond meets a third preset condition;

if yes, continuing to execute the step S4, otherwise, normally operating the clothes dryer, and continuing to execute the step S2;

s4, acquiring the temperature tcomp of a refrigerant at the inlet of the current condenser and the temperature tcond of the refrigerant at the outlet of the current condenser;

s5, calculating the value of current tcomp-tcond;

s6, judging whether the current value of tcomp-tcond meets a second preset condition; if so, the clothes dryer stops running to remind a user of cleaning the filter screen; if not, the dryer normally operates, and the step S2 is continuously executed;

wherein the first preset condition is that the continuous operation time y of the clothes dryer is more than or equal to Ymin, and the third preset condition is that the outlet temperature tcond of the condenser is more than or equal to T1 ℃.

2. The method for detecting the blockage of the filter screen of the clothes dryer as claimed in claim 1, wherein the second preset condition is that the current tcomp-tcond is less than or equal to T2 ℃, and the value range of T2 is 5-15 ℃.

3. The clogging detecting method of dryer screen according to claim 1, characterized in that it further comprises the steps of:

s6, judging whether the current value of tcomp-tcond meets a second preset condition; if so, the clothes dryer stops running, reminds the user to clean the filter screen, and continues to execute the step S7; if not, the dryer normally operates, and the step S2 is continuously executed;

and S7, reminding the user to select the filter screen cleaning opportunity, and reminding the user to clean the filter screen at the filter screen cleaning opportunity selected by the user.

4. The clogging detecting method of dryer screen according to claim 1, characterized in that it further comprises the steps of:

s6, judging whether the current value of tcomp-tcond meets a second preset condition; if so, the clothes dryer stops running, reminds the user to clean the filter screen, and continues to execute the step S8; if not, the dryer normally operates, and the step S2 is continuously executed;

s8, adding 1 to the value n of the counter, and continuing to execute the step S9;

s9, judging whether the value N of the counter is larger than or equal to a preset threshold value N, if so, controlling the clothes dryer to give a prompt of filter screen blockage, and if not, continuing to execute the step S2.

5. The method for detecting the blockage of the filter screen of the clothes dryer as claimed in claim 4, wherein N is a preset maximum value of a counter, and the value range of N is 3-10.

6. The clothes dryer filter screen clogging detection method according to claim 4, characterized by further comprising the steps of:

after the step S1 and before S2, performing step S0;

the step S0 includes:

s0, checking whether the filter screen is cleaned by the user after the clothes dryer is started to operate each time, and if the filter screen is not cleaned by the user, determining the initial value of the counter as the value of the counter when the last operation is finished; if the user finishes cleaning the filter screen, the initial value n of the counter is returned to 0, and the step S2 is continuously executed.

7. The clogging detecting method of dryer screen of claim 6, wherein the dryer determines whether the user performs the screen cleaning by the following procedure in the step S0:

s01, acquiring the current refrigerant temperature tcomp at the condenser inlet and the current refrigerant temperature tcond at the condenser outlet;

s02, calculating the value of current tcomp-tcond;

s03, judging whether the current value of tcomp-tcond meets a fourth preset condition; if so, judging that the user finishes cleaning the filter screen, and enabling the initial value n of the counter to return to 0; if not, judging that the filter screen is not cleaned by the user, reading the value of the counter when the last operation is finished, and setting the value as the initial value n of the counter;

the fourth preset condition is that the temperature difference tcomp-tcond of refrigerant between the inlet and the outlet of the condenser is less than or equal to T3 ℃, and the value range of T3 is 15-25 ℃.

8. Clothes dryer, characterized in that the clothes dryer adopts the clothes dryer filter screen blockage detection method of any one of claims 1 to 7 to detect filter screen blockage.

9. Laundry dryer according to claim 8, characterized in that it comprises air circulation means and refrigerant circulation means, said refrigerant circulation means comprising a condenser (6), a throttle valve (7), an evaporator (8) and a compressor (5) connected in sequence, the outlet of said condenser (6) being provided with a second temperature sensor (14), the inlet of said condenser (6) or the exhaust of said compressor (5) being provided with a first temperature sensor (13).

Technical Field

The invention relates to a clothes dryer and a control method thereof, in particular to a clothes dryer filter screen blockage detection method and the clothes dryer.

Background

The existing clothes dryers, such as heat pump clothes dryers, are usually provided with the following air circulation channels: the hot air heated by the condenser is sent into the drum filled with the clothes through the rear air duct, the humid air deprived of moisture from the clothes is sent back to the evaporator for dehumidification, and the dehumidified dry air is sent into the drum after being heated by the condenser again. Simultaneously, for carrying out circulation heating and drying to the air, still be provided with following refrigerant circulation passageway in the heat pump dryer: high-temperature and high-pressure refrigerant gas enters the condenser from an inlet of the condenser, is subjected to heat exchange with air outside the condenser to form medium-temperature and high-pressure liquid, is throttled by the throttle valve to form low-temperature and low-pressure liquid, absorbs heat by the evaporator to form low-temperature and low-pressure gas, is compressed by the compressor to form high-temperature and high-pressure gas again, and enters the condenser, so that the circulation of the refrigerant is completed.

In the air circulation process, the damp air after heat exchange with the clothes often carries part of the thread scraps, and in order to prevent the thread scraps from entering the evaporator and adhering to the fins of the evaporator, a thread scraps filter is usually arranged on the drum or between the drum and the evaporator, and the thread scraps filter mainly comprises a filter screen capable of filtering the thread scraps in the air.

However, in the long-term use of the clothes dryer, if the filter screen is not cleaned in time after drying, the thread scraps are accumulated on the filter screen, and in severe cases, the air inside the clothes dryer is difficult to flow, the air volume is greatly attenuated, the energy consumption is increased, and the drying efficiency is reduced.

Although some methods for detecting the blockage of the filter screen of the clothes dryer are also proposed in the prior art, the methods have the following defects: firstly, whether the filter screen is seriously blocked or not can be detected only, and a user cannot be reminded of cleaning the filter screen in time when the filter screen is slightly blocked, so that the clothes dryer is not beneficial to ensuring that the clothes dryer runs in a good state for a long time; secondly, the detection method is complex, low in accuracy and poor in real-time performance, and the blockage of the filter screen cannot be detected timely and accurately.

The present application is particularly proposed to solve the above problems.

Disclosure of Invention

In view of this, the invention aims to provide a clothes dryer filter screen blockage detection method and a clothes dryer, so as to solve the technical problems that the existing clothes dryer filter screen blockage detection method cannot remind a user to clean a filter screen in time when the filter screen is slightly blocked, and the detection method is complex, low in accuracy and poor in real-time performance.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a method for detecting blockage of a filter screen of a clothes dryer comprises the following steps:

s1, the clothes dryer starts to operate;

s2, acquiring the condenser outlet refrigerant temperature tcond of the clothes dryer and the continuous clothes dryer operation time y at regular intervals;

s3, judging whether the continuous operation time y of the clothes dryer meets a first preset condition or not; and/or whether the condenser outlet temperature tcond meets a third preset condition;

if yes, continuing to execute the step S4, otherwise, normally operating the clothes dryer, and continuing to execute the step S2;

s4, acquiring the temperature tcomp of a refrigerant at the inlet of the current condenser and the temperature tcond of the refrigerant at the outlet of the current condenser;

s5, calculating the value of current tcomp-tcond;

s6, judging whether the current value of tcomp-tcond meets a second preset condition; if so, the clothes dryer stops running to remind a user of cleaning the filter screen; if not, the dryer normally operates, and the step S2 is continuously executed;

wherein the first preset condition is that the continuous operation time y of the clothes dryer is more than or equal to Ymin, and the third preset condition is that the outlet temperature tcond of the condenser is more than or equal to T1 ℃.

Further, the second preset condition is that the current tcomp-tcond is less than or equal to T2 ℃, and the value range of T2 is 5-15 ℃.

Further, the method for detecting the blockage of the filter screen of the clothes dryer further comprises the following steps:

s6, judging whether the current value of tcomp-tcond meets a second preset condition; if so, the clothes dryer stops running, reminds the user to clean the filter screen, and continues to execute the step S7; if not, the dryer normally operates, and the step S2 is continuously executed;

and S7, reminding the user to select the filter screen cleaning opportunity, and reminding the user to clean the filter screen at the filter screen cleaning opportunity selected by the user.

Further, the method for detecting the blockage of the filter screen of the clothes dryer further comprises the following steps:

s6, judging whether the current value of tcomp-tcond meets a second preset condition; if so, the clothes dryer stops running, reminds the user to clean the filter screen, and continues to execute the step S8; if not, the dryer normally operates, and the step S2 is continuously executed;

s8, adding 1 to the value n of the counter, and continuing to execute the step S9;

s9, judging whether the value N of the counter is larger than or equal to a preset threshold value N, if so, controlling the clothes dryer to give a prompt of filter screen blockage, and if not, continuing to execute the step S2.

Further, N is a preset maximum value of the counter, and the value range of N is 3-10.

Further, the method for detecting the blockage of the filter screen of the clothes dryer further comprises the following steps:

after the step S1 and before S2, performing step S0;

the step S0 includes:

s0, checking whether the filter screen is cleaned by the user after the clothes dryer is started to operate each time, and if the filter screen is not cleaned by the user, determining the initial value of the counter as the value of the counter when the last operation is finished; if the user finishes cleaning the filter screen, the initial value n of the counter is returned to 0, and the step S2 is continuously executed.

Further, in the step S0, the clothes dryer determines whether the user performs the filter cleaning by:

s01, acquiring the current refrigerant temperature tcomp at the condenser inlet and the current refrigerant temperature tcond at the condenser outlet;

s02, calculating the value of current tcomp-tcond;

s03, judging whether the current value of tcomp-tcond meets a fourth preset condition; if so, judging that the user finishes cleaning the filter screen, and enabling the initial value n of the counter to return to 0; if not, judging that the filter screen is not cleaned by the user, reading the value of the counter when the last operation is finished, and setting the value as the initial value n of the counter;

the fourth preset condition is that the temperature difference tcomp-tcond of refrigerant between the inlet and the outlet of the condenser is less than or equal to T3 ℃, and the value range of T3 is 15-25 ℃.

The clothes dryer adopts the clothes dryer filter screen blockage detection method to detect the blockage of the filter screen.

Further, the clothes dryer comprises an air circulation device and a refrigerant circulation device, the refrigerant circulation device comprises a condenser, a throttle valve, an evaporator and a compressor which are sequentially connected, a second temperature sensor is arranged at an outlet of the condenser, and a first temperature sensor is arranged at an inlet of the condenser or an exhaust port of the compressor.

Compared with the prior art, the clothes dryer filter screen blockage detection method and the clothes dryer can remind a user of cleaning the filter screen in time when the filter screen is slightly blocked; when the filter screen is seriously blocked, the alarm prompt of the filter screen can be sent out in time, and the detection method has the advantages of simplicity, high accuracy, good real-time performance and flexible and convenient operation.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a first flowchart of a method for detecting clogging of a filter screen of a clothes dryer according to the present invention;

FIG. 2 is a second flowchart of a clothes dryer screen clogging detection method according to the present invention;

FIG. 3 is a third flowchart of a method for detecting clogging of a filter of a clothes dryer according to the present invention;

FIG. 4 is a fourth flowchart of a method for detecting clogging of a filter screen of a clothes dryer according to the present invention;

FIG. 5 is a fifth flowchart of a method for detecting clogging of a filter screen of a clothes dryer according to the present invention;

fig. 6 is a schematic view of a dryer according to the present invention.

Description of reference numerals:

the system comprises a roller 1, a front air duct 2, a rear air duct 3, a fan 4, a compressor 5, a condenser 6, a throttle valve 7, an evaporator 8, a refrigerant pipeline 9, a motor 10, a first transmission device 11, a second transmission device 12, a first temperature sensor 13 and a second temperature sensor 14.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present invention. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

Example 1

As shown in FIGS. 1-2, a method for detecting blockage of a filter screen of a clothes dryer comprises the following steps:

s1, the clothes dryer starts to operate;

s2, acquiring continuous operation time y of the clothes dryer at regular intervals;

s3, judging whether the continuous operation time y of the clothes dryer meets a first preset condition or not; if yes, continuing to execute the step S4, otherwise, normally operating the clothes dryer, and continuing to execute the step S2;

s4, acquiring the temperature tcomp of a refrigerant at the inlet of the current condenser and the temperature tcond of the refrigerant at the outlet of the current condenser;

s5, calculating the value of current tcomp-tcond;

s6, judging whether the current value of tcomp-tcond meets a second preset condition; if so, the clothes dryer stops running to remind a user of cleaning the filter screen; if not, the dryer operates normally and continues to perform step S2.

The first preset condition is that the continuous operation time y of the clothes dryer is more than or equal to Ymin, and the Ymin is a preset continuous operation time threshold value of the clothes dryer.

Preferably, the value range of Ymin is 5-50 min.

The second preset condition is that the current tcomp-tcond is not more than T2 ℃, the temperature T2 ℃ is the minimum value of the temperature difference of the refrigerant between the inlet and the outlet of the condenser, and when the tcomp-tcond is not more than T2 ℃, the heat dissipation of the condenser is insufficient, the condenser does not perform sufficient heat exchange with the outside air, and the filter screen is blocked to a certain degree; when tcomp-tcond is more than T2 ℃, the heat dissipation effect of the condenser is shown to meet the set requirement, and the filter screen is basically free of blockage.

Preferably, the value range of the T2 is 5-15 ℃.

When the current tcomp-tcond is found to be less than or equal to T2 ℃, the clothes dryer stops running until a user cleans the filter screen and then restarts the clothes dryer.

Firstly, determining the time when the clothes dryer enters a filter screen blockage detection program and judging whether the clothes dryer enters the filter screen blockage detection program or not according to whether the continuous operation time y of the clothes dryer is more than or equal to Ymin or not; on the other hand, the clothes dryer can be ensured to run in a stable state, and a good foundation is provided for detecting the blocking condition of the filter screen in the later period. And then detecting whether the filter screen is blocked or not through the temperatures tcomp and tcond at the inlet and the outlet of the condenser. On one hand, the problem that the temperature tcomp and tcond of the inlet and the outlet of the condenser are frequently detected to cause energy and resource waste due to the fact that the clothes dryer is frequently subjected to the filter screen blockage detection process for a long time is avoided; on the other hand, whether the filter screen is blocked or not is judged through temperatures tcomp and tcond of an inlet and an outlet of the condenser, the detection process is simple, the detection precision is high, and the real-time performance is good.

In addition, when the current value of tcomp-tcond satisfies the second preset condition, the clothes dryer is controlled to pause, meanwhile, a prompt for cleaning the filter screen is sent to a user, at the moment, the filter screen of the clothes dryer is blocked to a certain degree, the prompt for cleaning the filter screen is sent to the user in time through the clothes dryer, the user can conveniently and timely clean the filter screen, the long-term operation of the clothes dryer under the condition that the filter screen is dirty and blocked is avoided, the clothes drying effect is improved, and the energy consumption is reduced.

Further, the method for detecting the blockage of the filter screen of the clothes dryer further comprises the following steps:

s6, judging whether the current value of tcomp-tcond meets a second preset condition; if so, the clothes dryer stops running, reminds the user to clean the filter screen, and continues to execute the step S7; if not, the dryer normally operates, and the step S2 is continuously executed;

and S7, reminding the user to select the filter screen cleaning opportunity, and reminding the user to clean the filter screen at the filter screen cleaning opportunity selected by the user.

Specifically, the filter screen selecting and cleaning opportunity for the user to select at least comprises: cleaning the filter screen immediately and cleaning the filter screen after the clothes drying is finished, and if a user selects to clean the filter screen immediately, the clothes dryer stops running until the user finishes cleaning the filter screen and can continue running; and if the user cleans the filter screen after selecting the clothes drying, the clothes dryer continues to operate, and the user is reminded to clean the filter screen again when the clothes dryer is started next time.

Further, if the user does not select any one of the set cleaning opportunities within the set time, the clothes dryer automatically selects to clean the filter screen after the clothes drying is finished, the clothes dryer continues to operate, and the user is reminded again when the clothes dryer is started next time.

The selection of filter screen clearance opportunity for the user operation is more nimble, and use experience is better.

Example 2

As shown in fig. 3, a method for detecting clogging of a filter screen of a dryer includes the steps of:

s1, the clothes dryer starts to operate;

s2, acquiring the refrigerant temperature tcond at the outlet of the condenser of the clothes dryer at regular intervals;

s3, judging whether the condenser outlet refrigerant temperature tcond meets a third preset condition; if yes, continuing to execute the step S4, otherwise, normally operating the clothes dryer, and continuing to execute the step S2;

s4, acquiring the temperature tcomp of a refrigerant at the inlet of the current condenser and the temperature tcond of the refrigerant at the outlet of the current condenser;

s5, calculating the value of current tcomp-tcond;

s6, judging whether the current value of tcomp-tcond meets a second preset condition; if so, the clothes dryer stops running to remind a user of cleaning the filter screen; if not, the dryer operates normally and continues to perform step S2.

Wherein, the third preset condition is that the condenser outlet temperature tcond is greater than or equal to T1 ℃, the temperature T1 ℃ is the maximum value of the preset condenser outlet temperature tcond, generally, if the value of the condenser outlet temperature tcond is lower, the refrigerant in the condenser and the outside air perform good heat exchange, and the filter screen is not blocked; if the value of the condenser outlet temperature tcond is high, it means that the refrigerant in the condenser does not perform good heat exchange with the outside air, and the filter screen is blocked.

Preferably, the value range of the T1 is 40-80 ℃.

The second preset condition is that the current tcomp-tcond is not more than T2 ℃, the temperature T2 ℃ is the minimum value of the temperature difference of the refrigerant between the inlet and the outlet of the condenser, and when the tcomp-tcond is not more than T2 ℃, the heat dissipation of the condenser is insufficient, the condenser does not perform sufficient heat exchange with the outside air, and the filter screen is blocked to a certain degree; when tcomp-tcond is more than T2 ℃, the heat dissipation effect of the condenser is shown to meet the set requirement, and the filter screen is basically free of blockage.

Preferably, the value range of the T2 is 5-15 ℃.

In the embodiment, the outlet temperature tcond of the condenser is monitored to replace the monitoring of the continuous operation time y of the clothes dryer in the embodiment 1, so that the method for detecting the blockage of the filter screen of the clothes dryer also has the advantages of simple detection process, high detection precision and good real-time property. In addition, a second preset condition is dynamically set through the temperature tcomp of the refrigerant at the inlet of the current condenser, and compared with the constant second preset condition, the real-time performance and the accuracy of the clothes dryer filter screen blockage detection method can be greatly improved.

Example 3

As shown in FIGS. 4 to 5, a method for detecting blockage of a filter screen of a clothes dryer comprises the following steps:

s1, the clothes dryer starts to operate;

s2, acquiring the condenser outlet refrigerant temperature tcond of the clothes dryer and the continuous clothes dryer operation time y at regular intervals;

s3, judging whether the continuous operation time y of the clothes dryer meets a first preset condition or not; if yes, continuing to execute the step S4, otherwise, continuing to judge whether the condenser outlet temperature tcond meets a third preset condition; if yes, continuing to execute the step S4, otherwise, normally operating the clothes dryer, and continuing to execute the step S2;

s4, acquiring the temperature tcomp of a refrigerant at the inlet of the current condenser and the temperature tcond of the refrigerant at the outlet of the current condenser;

s5, calculating the value of current tcomp-tcond;

s6, judging whether the current value of tcomp-tcond meets a second preset condition; if so, the clothes dryer stops running, reminds the user to clean the filter screen, and continues to execute the step S8; if not, the dryer normally operates, and continues to execute the step S2;

s8, adding 1 to the value n of the counter, and continuing to execute the step S9;

s9, judging whether the value N of the counter is larger than or equal to a preset threshold value N, if so, controlling the clothes dryer to give a prompt of filter screen blockage, and if not, continuing to execute the step S2.

And N is a preset maximum value of the counter, and the value range of N is 3-10.

As some embodiments of the present application, the step S3 may further be determining whether the continuous operation time y of the dryer satisfies a first preset condition; and whether the condenser outlet temperature tcond meets a third preset condition, if so, continuing to execute the step S4, and if not, normally operating the clothes dryer and continuing to execute the step S2.

Further, at the dryer operation in-process, the display panel of dryer will show the current numerical value of counter, and the user can be through the current jam degree of judging the filter screen of counter to and whether select to clear up the filter screen, so, make the detection process that the filter screen blockked up not influence the normal operating of dryer, simultaneously, can also clearly instruct the filter screen to block up the degree and remind the user to carry out the opportunity that the filter screen blockked up the clearance.

Furthermore, in the operation process of the clothes dryer, a display panel of the clothes dryer can display the current numerical value of the counter and send different prompts according to the numerical value of the counter, for example, when the value n of the counter is between 0 and 3, the clothes dryer reminds a user of cleaning a filter screen through the flickering of an indicator light; when the value n of the counter is between 4 and 6, the clothes dryer reminds a user of cleaning a filter screen by making a buzzer; when the value n of the counter is larger than or equal to 7, the clothes dryer reminds a user of cleaning the filter screen by emitting sharp calling sound and prolonging the stop time.

Through the application of the counter, on one hand, the blocking degree of the filter screen is displayed; on the other hand, the detection accuracy can be improved.

Further, the method for detecting the blockage of the filter screen of the clothes dryer further comprises the following steps:

after the above step S1, before S2, step S0 is performed;

specifically, the step S0 includes:

s0, checking whether the filter screen is cleaned by the user after the clothes dryer is started to operate each time, and if the filter screen is not cleaned by the user, determining the initial value of the counter as the value of the counter when the last operation is finished; if the user finishes cleaning the filter screen, the initial value n of the counter returns to 0, and the step S2 is continuously executed;

wherein, the value of the counter is automatically stored in the clothes dryer after each clothes drying; the clothes dryer judges whether the user cleans the filter screen through the following processes:

s01, acquiring the current refrigerant temperature tcomp at the condenser inlet and the current refrigerant temperature tcond at the condenser outlet;

s02, calculating the value of current tcomp-tcond;

s03, judging whether the current value of tcomp-tcond meets a fourth preset condition; if so, judging that the user finishes cleaning the filter screen, and enabling the initial value n of the counter to return to 0; if not, judging that the filter screen is not cleaned by the user, reading the value of the counter when the last operation is finished, and setting the value as the initial value n of the counter;

the fourth preset condition is that the temperature difference tcomp-tcond of the refrigerant between the inlet and the outlet of the condenser is more than or equal to T3 ℃, and the temperature T3 ℃ is the minimum value of the temperature difference of the refrigerant between the inlet and the outlet of the condenser when the filter screen is not blocked completely.

Preferably, the value range of T3 is 15-25 ℃.

According to the method and the device, when the clothes dryer is started to operate, the cleaning condition of the filter screen is checked, so that the method for detecting the blockage of the clothes dryer filter screen can be carried out on a real-time and accurate basis, and the accuracy of the method for detecting the blockage of the clothes dryer filter screen can be ensured.

Example 4

As shown in fig. 6, a clothes dryer performs filter clogging condition detection by using the above-mentioned method for detecting clogging of a filter of a clothes dryer.

Further, the clothes dryer comprises an air circulation device and a refrigerant circulation device, the air circulation device is composed of a condenser 6, a rear air duct 3, a fan 4, a roller 1, a front air duct 2 and an evaporator 8 which are sequentially connected, air in the clothes dryer flows along the air circulation device in a circulation mode, and drying of clothes is achieved, and the clothes dryer is specific: the hot air heated by the condenser 6 is sent into the drum 1 filled with the clothes through the rear air duct 3, the wet air deprived of moisture from the clothes is sent back to the evaporator 8 through the front air duct 2 for dehumidification, the dried air after dehumidification is sent into the drum 1 after being heated by the condenser 6 again, and thus, the air circulation process is completed.

Furthermore, the air circulation device further comprises a motor 10, a first transmission device 11 and a second transmission device 12, one end of the motor 10 is connected with the roller 1 through the first transmission device 11, and the other end of the motor 10 is connected with the fan 4 through the second transmission device 12, so that the motor 10 can drive the roller 1 and the fan 4 to rotate.

Further, the refrigerant circulating device comprises a condenser 6, a throttle valve 7, an evaporator 8 and a compressor 5 which are sequentially arranged, the condenser 6, the throttle valve 7, the evaporator 8 and the compressor 5 are sequentially communicated through a refrigerant pipeline 9, a second temperature sensor 14 is arranged at an outlet of the condenser 6, and a first temperature sensor 13 is arranged at an inlet of the condenser 6. The second temperature sensor 14 is configured to detect a refrigerant temperature tcond at an outlet of the condenser, and the first temperature sensor 13 is configured to detect a refrigerant temperature tcomp at an inlet of the condenser.

As some embodiments of the present application, the first temperature sensor 13 may also be located at the discharge port of the compressor 5, and in this case, the temperature of the discharge port of the compressor 5 is substantially equal to the temperature of the inlet of the condenser 6 because the discharge port of the compressor 5 is directly communicated with the inlet of the condenser 6.

In the refrigerant circulation process, refrigerant gas with high temperature and high pressure enters the condenser 6 from an inlet of the condenser 6, exchanges heat with air outside the condenser 6 to become liquid with medium temperature and high pressure, is throttled by the throttle valve 7 to become liquid with low temperature and low pressure, absorbs heat by the evaporator 8 to become gas with low temperature and low pressure, is compressed by the compressor 5 to become gas with high temperature and high pressure again, and enters the condenser 6, thereby completing the refrigerant circulation.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.