CN114561788A - Method and device for detecting filth blockage of filter screen of heat pump clothes dryer - Google Patents
Method and device for detecting filth blockage of filter screen of heat pump clothes dryer Download PDFInfo
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- CN114561788A CN114561788A CN202210208265.5A CN202210208265A CN114561788A CN 114561788 A CN114561788 A CN 114561788A CN 202210208265 A CN202210208265 A CN 202210208265A CN 114561788 A CN114561788 A CN 114561788A
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- filth blockage
- circulating fan
- filter screen
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F58/00—Domestic laundry dryers
- D06F58/32—Control of operations performed in domestic laundry dryers
- D06F58/34—Control of operations performed in domestic laundry dryers characterised by the purpose or target of the control
- D06F58/50—Responding to irregular working conditions, e.g. malfunctioning of blowers
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/42—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to filters or pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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- Textile Engineering (AREA)
- Control Of Washing Machine And Dryer (AREA)
Abstract
The invention discloses a method and a device for detecting filth blockage of a filter screen of a heat pump clothes dryer, and relates to the technical field of heat pump clothes dryers. The invention comprises the following steps: acquiring operating parameters of a circulating fan; calculating to obtain the real-time power of the circulating fan according to the voltage and the current of the circulating fan; acquiring a filth blockage correction value corresponding to the humidity and the fan power according to a preset humidity-power correction function; performing compensation calculation on the real-time power according to the filth blockage correction value to obtain a new filth blockage value; and comparing the new filth blockage value with a preset filth blockage standard value, and sending a signal by the clothes dryer controller when the filter screen reaches a filth blockage condition. According to the invention, the situation of dirty and blocked lint on the filter screen is detected in time through the fan power feedback and power monitoring module of the heat pump clothes dryer, and then whether cleaning is needed or not is judged according to the dirty and blocked degree, so that a user is reminded of cleaning the filter screen in time through information feedback, and the heat exchange performance of a heat pump system is prevented from being influenced.
Description
Technical Field
The invention belongs to the technical field of heat pump clothes dryers, and particularly relates to a method and a device for detecting filth blockage of a filter screen of a heat pump clothes dryer, which are used for solving the technical problem that the conventional heat pump clothes dryer cannot detect filth blockage of the filter screen.
Background
With the continuous improvement of living standard of people, the clothes dryer gradually enters into every family, and the wet clothes after being washed are quickly dried by using the clothes dryer, so that the clothes dryer gradually becomes the living habit of consumers. The high-end clothes dryers in the market at present mostly use a heat pump type refrigerating system, and the heat pump type clothes dryers become the most favored types with the advantages of small damage to clothes, stable performance, good drying effect and the like, and have grown into high-end models in the market.
A heat pump dryer in the prior art includes two cycles, one of which is a refrigerant system cycle and the other is a humid air cycle. The refrigerant system comprises a compressor, a condenser, a throttling device and an evaporator, and the compressor, the condenser, the throttling device and the evaporator jointly form a heat pump type refrigerating system. The wet air circulation is composed of a drying chamber, a clothes drying air channel, a circulating fan and the like. The working modes of the existing heat pump type clothes dryer are as follows: the wet air absorbing moisture from the clothes is sent back to the evaporator for dehumidification, the dehumidified air is heated by the condenser again and sent into the drying chamber, the wet air absorbing moisture from the clothes is sent back to the evaporator again, the wet air is dehumidified again, and the operation is repeated until the clothes are dried and stopped. In the clothes drying process, the flock of clothes can enter the circulating air duct along with air, and when the clothes pass through the evaporator and the condenser, the flock can be attached to the evaporator and the condenser due to the obstruction of the heat exchanger fins, so that the operation of a heat pump system and the clothes drying effect are influenced.
Aiming at the problems, the heat pump system of the clothes dryer is similar to the traditional air conditioning industry in structure; the air-conditioning heat pump refrigerating system mostly adopts the scheme of firstly quickly refrigerating, quickly frosting or freezing the surface of the evaporator by utilizing vapor in the air, then quickly heating, enabling the frost or the ice on the surface of the evaporator to be changed into water to take away dust or other fine impurities on the surface after being heated, drying the evaporator, and further blowing and drying moisture in the evaporator by ventilation. Although the scheme can realize the cleaning of the indoor heat exchanger of the air conditioner, the cleaning effect is not good enough. Meanwhile, most of the heat pump clothes drying systems are operated under a single working condition, and most of the heat exchangers are designed without exchange use (namely, a refrigeration and heating mode is switched, so that an evaporator is converted into a condenser, and the condenser is converted into the evaporator for use), so that the self-cleaning problem still exists.
In order to prevent the heat exchanger from being blocked by the lint of clothes, a filter screen is arranged in front of the evaporator of the heat pump clothes dryer, and the cleaning frequency is frequent because the air of the heat pump clothes dryer is in closed circulation, so the accumulation of the lint on the filter screen is faster than that of an air conditioner; because the heat pump clothes dryer on the market at present does not have the dirty stifled situation of detection filter screen, also can't go up intelligence warning user and carry out the filter screen washing just so heat pump clothes dryer, consequently heat pump clothes dryer only reminds the user in the description before drying the clothing at every turn, all need carry out the washing operation to the filter screen, and the user forgets to wash the filter screen and can lead to drying the clothing effect decline or even the emergence of dryer heat pump system inefficacy.
Disclosure of Invention
The invention aims to provide a method and a device for detecting filth blockage of a filter screen of a heat pump clothes dryer.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a filth blockage detection method for a filter screen of a heat pump clothes dryer, which comprises the following steps:
step S1: acquiring operating parameters of a circulating fan; the operation parameters comprise the rotating speed of the circulating fan, the voltage of the circulating fan and the current of the circulating fan;
step S2: calculating to obtain the real-time power of the circulating fan according to the voltage and the current of the circulating fan;
step S3: acquiring the humidity of clothes in a barrel of a heat pump clothes dryer at present, and acquiring a filth blockage correction value corresponding to the humidity and the power of a fan according to a preset humidity-power correction function;
step S4: performing compensation calculation on the real-time power according to the filth blockage correction value to obtain a new filth blockage value;
step S5: comparing the new filth blockage value with a preset filth blockage standard value corresponding to the rotating speed with the same rotating speed of the circulating fan, and judging whether a filter screen of the heat pump clothes dryer meets a filth blockage condition or not;
step S6: when the filter screen reaches the dirty and blocked condition, the dryer controller sends a signal to remind a user to clean the filter screen so as to eliminate the dirty and blocked filter screen.
As a preferable technical solution, in step S3, the dirty block correction value F is calculated by the following formula:
F＝F0(P,Uac,Hum)＝P+F1(Uac)+F2(Hum)；
in the formula, the parameter P is the power of the circulating fan, Uac is the input voltage, Hum is the humidity of the clothes, F0Is the filth blockage value of the filter screen in a completely clean state and F0Obtained by laboratory conditions, F1(Uac) is the voltage correction function and F2(Hum) is the humidity correction function.
As a preferred technical solution, a filter screen detection filth blockage value F is inputted into the F1(Uac) voltage correction functionSSubstituting the obtained power supply input voltage into the voltage correction function to obtain a corrected dirty blocking result of the voltage; and inputting the acquired humidity into the F2(Hum) humidity correction function to obtain a corrected dirty blocking result of the humidity and the running power.
As a preferable technical solution, in the step S4, the calculation formula of the filth value is as follows:
Y＝FS/F0＝(100+X)％；
in the formula, (100+ X)% is the filth blockage value of the filter screen.
The invention relates to a filth blockage detection device for a filter screen of a heat pump clothes dryer, which comprises a circulating fan information acquisition unit, a real-time power calculation unit and a heat pump clothes dryer controller, wherein the circulating fan information acquisition unit is used for acquiring filth blockage of the filter screen;
the circulating fan information acquisition unit, the real-time power calculation unit and the heat pump clothes dryer controller are sequentially connected;
the circulating fan information acquisition unit is used for acquiring the operating parameters of the circulating fan, wherein the operating parameters comprise the rotating speed of the circulating fan, the voltage of the circulating fan, the current of the circulating fan and the humidity of clothes;
the real-time power calculation unit is used for calculating and obtaining the real-time power of the circulating fan according to the voltage of the circulating fan and the current of the circulating fan and calculating the dirty and blocked value of the filter screen according to the obtained power parameter of the circulating fan;
and the heat pump clothes dryer controller is used for comparing the filth blockage value of the filter screen with a filth blockage threshold value arranged in the control panel in advance, and controlling the heat pump clothes dryer to execute corresponding operation by the control panel when the filth blockage condition is reached.
The invention has the following beneficial effects:
according to the invention, the situation of dirty and blocked lint on the filter screen is detected in time through the fan power feedback and power monitoring module of the heat pump clothes dryer, and then whether cleaning is needed or not is judged according to the dirty and blocked degree, so that a user is reminded of cleaning the filter screen in time through information feedback, and the heat exchange performance of a heat pump system is prevented from being influenced.
Of course, it is not necessary for any product to practice the invention to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for detecting filth blockage of a filter screen of a heat pump clothes dryer according to the present invention;
FIG. 2 is a schematic view of a filth blockage detection device for a filter screen of a heat pump clothes dryer according to the present invention;
fig. 3 is a schematic diagram of a heat pump dryer in the prior art.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
As shown in fig. 3, in the prior art, a refrigeration system of a heat pump type clothes dryer on the market is a single-cycle refrigeration system, the refrigeration system is composed of a compressor, an evaporator, a capillary tube and a condenser, in the clothes drying process, after wet air passes through a front air duct 4 of the clothes dryer, clothes flock is filtered through a filter screen 41, and after heat exchange is carried out between the wet air and an evaporator 8, moisture in the wet air is cooled and condensed into water by the evaporator; the dehumidified air is heated again by the condenser 6 and sent into the drying chamber of the dryer, and the humid air, which again absorbs moisture from the laundry, is sent back to the evaporator; the operation is repeated until the clothes are dried.
In fig. 3, the list of components represented by the reference numerals is as follows:
1-drying chamber, 2-rear air duct, 3-circulating fan, 4-front air duct, 41-filter screen, 5-compressor, 6-condenser, 7-capillary tube and 8-evaporator, wherein the blank arrow is the circulation direction of wet air, and the black arrow is the circulation direction of refrigerant.
Example two
Referring to fig. 2, the heat pump type clothes dryer provides a filter screen filth blockage detection device, which can be disposed on an electric control board of the existing clothes dryer, and the detection device includes:
the circulating fan information acquisition unit is used for acquiring the operating parameters of the circulating fan, wherein the operating parameters comprise the rotating speed of the circulating fan, the voltage of the circulating fan, the current of the circulating fan and the humidity of clothes;
the real-time power calculation unit is used for calculating and obtaining the real-time power of the circulating fan according to the voltage and the current of the circulating fan;
calculating a filth blockage value of the filter screen according to the obtained fan power parameter;
according to the filth blockage value of the filter screen, comparing with a filth blockage threshold value which is arranged in the control panel in advance, when reaching the filth blockage condition, the control panel sends out a reminding message for cleaning the filter screen to a user through a signal circuit, such as a display panel photoelectric signal
EXAMPLE III
Referring to fig. 1, a schematic flow chart of a method for detecting filth blockage of a filter screen of a heat pump clothes dryer is shown, the method comprising the following steps:
s1, obtaining operation parameters of the circulating fan, wherein the operation parameters comprise the rotating speed of the circulating fan, the voltage of the circulating fan and the current of the circulating fan;
step S2, calculating to obtain the real-time power of the circulating fan according to the voltage and the current of the circulating fan;
step S3, acquiring the humidity of clothes in a barrel of the heat pump clothes dryer at present, and acquiring a filth blockage correction value corresponding to the humidity and the power of a fan according to a preset humidity-power correction function;
step S4, performing compensation calculation on the real-time power according to the filth blockage correction value to obtain a new filth blockage value;
step S5, comparing the new filth blockage value with a preset filth blockage standard value corresponding to the rotating speed with the same rotating speed of the circulating fan, and judging whether the filter screen of the heat pump clothes dryer meets a filth blockage condition or not;
and step S6, when the filter screen reaches the filth blockage condition, the clothes dryer controller sends a signal to remind a user to clean the filter screen so as to eliminate filth blockage of the filter screen.
In the refrigerator controller, a functional relation between a dirty blocking value of a filter netlist obtained through test data and a light intensity difference value of a light emitting module passing through a filter screen is pre-stored, and a threshold value for reminding a user to clean is set.
The preset filth blockage standard value corresponding to the power of the circulating fan can be set by a manufacturer when the clothes dryer leaves a factory, and is stored in an EEPROM of a control panel of the heat pump clothes dryer and called out for use when filth blockage control is carried out on the heat pump clothes dryer. Certainly, the preset filth blockage standard value corresponding to the rotating speed of the circulating fan can also be obtained by testing the heat pump clothes dryer under an ideal clean condition, and the influence of the humidity of clothes and the input voltage of the power supply on the filth blockage value is also considered in the testing process.
Along with the use of the clothes dryer, the filter screen gradually accumulates the flock, the air quantity passing through the filter screen is gradually reduced, and the air resistance is increased to cause the power of the circulating fan to be increased.
The filth blockage value F is obtained by calculation through the following preset function:
F＝F0(P，Uac，Hum)＝P+F1(Uac)+F2(Hum)
wherein the content of the first and second substances,
the parameter P is the power of the circulating fan, Uac is input voltage, and Hum is the humidity of the clothes; filth blockage value F of filter screen in completely clean state0Obtained under laboratory conditions;
filth blockage value F detected by filter screenSSubstituting the acquired power supply input voltage into the voltage correction function through an F1(Uac) voltage correction function to obtain a corrected dirty and blocked result of the voltage; f2(Hum) is a humidity correction function, and the acquired humidity is substituted into the humidity correction function to obtain a corrected dirty-blocking result of the humidity and the operating power.
The power change of the circulating fan of the heat pump clothes dryer corresponds to the filth blockage of the filter screen, and the filth blockage value Y is FS/F0(100+ X)%; "(100 + X)%" is the filter screen filth blockage threshold.
According to laboratory detection of a filter screen of the clothes dryer, under the condition of complete filth blockage, most of X values of the clothes dryer are 20-30, and in the example, the value X is 25 to perform filth blockage grade division.
One specific example of the division is: dividing the clothes into 5 grades, wherein each grade is divided into the following table 1, and the data of the table is solidified into a clothes dryer control program;
| grade | Clean and clean | Slight filth blockage | Moderate filth blockage | Severe filth blockage | Super filth blockage |
| Value of visceral obstruction | 1 | 1≤Y<105％ | 105％≤Y<115％ | 115％≤Y<120％ | 120％≤Y<125％ |
TABLE 1 dirty-blocking degree dividing table for filtering net
When the clothes dryer is used, before clothes drying operation work is carried out, dirty blocking value detection is carried out, comparison is carried out on the dirty blocking value and a numerical value solidified in a clothes dryer control program according to a detection result, and after the dirty blocking degree of the dust filtering net is judged, whether user reminding is carried out or not and control operation is carried out on the clothes dryer drying operation state is determined, and the operation is carried out according to the following steps:
1) under the conditions of cleanness and slight filth blockage, the user is not reminded to clean the filter screen, and the clothes dryer can work normally;
2) under the condition of moderate filth blockage, after the clothes dryer normally works, reminding a user to clean the filter screen;
3) under the condition of severe filth blockage, a user is reminded to clean the filter screen, and the user can select a clothes dryer to continue a working mode or clean the filter screen;
4) under the condition of super filth blockage, a user is reminded to clean the filter screen, the user cannot implement a clothes drying operation instruction of the clothes dryer, the filter screen needs to be taken out and cleaned, and the filth blockage value is detected after the filter screen is installed again, so that the clothes dryer continues to work after the conditions of the states 1), 2) and 3) are met.
It should be noted that, in the above system embodiment, each included unit is only divided according to functional logic, but is not limited to the above division as long as the corresponding function can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
In addition, it is understood by those skilled in the art that all or part of the steps in the method for implementing the embodiments described above may be implemented by a program instructing associated hardware, and the corresponding program may be stored in a computer-readable storage medium.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (5)
1. A method for detecting filth blockage of a filter screen of a heat pump clothes dryer is characterized by comprising the following steps:
step S1: acquiring operating parameters of a circulating fan; the operation parameters comprise the rotating speed of the circulating fan, the voltage of the circulating fan and the current of the circulating fan;
step S2: calculating to obtain the real-time power of the circulating fan according to the voltage and the current of the circulating fan;
step S3: acquiring the humidity of clothes in a barrel of a heat pump clothes dryer at present, and acquiring a filth blockage correction value corresponding to the humidity and the power of a fan according to a preset humidity-power correction function;
step S4: performing compensation calculation on the real-time power according to the filth blockage correction value to obtain a new filth blockage value;
step S5: comparing the new filth blockage value with a preset filth blockage standard value corresponding to the rotating speed with the same rotating speed of the circulating fan, and judging whether a filter screen of the heat pump clothes dryer meets a filth blockage condition or not;
step S6: when the filter screen reaches the dirty and blocked condition, the dryer controller sends a signal to remind a user to clean the filter screen.
2. The method for detecting filth blockage of filter screen of heat pump clothes dryer according to claim 1, wherein in the step S3, the filth blockage correction value F is calculated according to the following formula:
F＝F0(P,Uac,Hum)＝P+F1(Uac)+F2(Hum)；
in the formula, the parameter P is the power of the circulating fan, Uac is the input voltage, Hum is the humidity of the clothes, F0Is the filth blockage value of the filter screen in a completely clean state and F0Obtained by laboratory conditions, F1(Uac) is the voltage correction function and F2(Hum) is the humidity correction function.
3. The method as claimed in claim 2, wherein a filter screen detection dirtiness value F is inputted into the F1(Uac) voltage correction functionSSubstituting the obtained power supply input voltage into the voltage correction function to obtain a corrected dirty blocking result of the voltage; and inputting the acquired humidity into the F2(Hum) humidity correction function to obtain a corrected dirty blocking result of the humidity and the running power.
4. The method as claimed in claim 1, wherein in step S4, the dirty value is calculated as follows:
Y＝FS/F0＝(100+X)％；
in the formula, (100+ X)% is the filth blockage value of the filter screen.
5. A filth blockage detection device for a filter screen of a heat pump clothes dryer comprises a circulating fan information acquisition unit, a real-time power calculation unit and a heat pump clothes dryer controller,
the circulating fan information acquisition unit, the real-time power calculation unit and the heat pump clothes dryer controller are sequentially connected;
the circulating fan information acquisition unit is used for acquiring the operating parameters of the circulating fan, wherein the operating parameters comprise the rotating speed of the circulating fan, the voltage of the circulating fan, the current of the circulating fan and the humidity of clothes;
the real-time power calculation unit is used for calculating and obtaining the real-time power of the circulating fan according to the voltage and the current of the circulating fan and calculating the filth blockage value of the filter screen according to the obtained power parameter of the circulating fan;
and the heat pump clothes dryer controller is used for comparing the filth blockage value of the filter screen with a filth blockage threshold value arranged in the control panel in advance, and controlling the heat pump clothes dryer to execute corresponding operation by the control panel when the filth blockage condition is reached.
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| CN111218793A (en) * | 2020-01-07 | 2020-06-02 | 珠海格力电器股份有限公司 | Method and device for detecting filth blockage state of filtering part of clothes drying equipment and clothes drying equipment |
| CN112306583A (en) * | 2019-08-20 | 2021-02-02 | 无锡小天鹅电器有限公司 | Air duct filter screen detection method and device of drying device |
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| JP2000102700A (en) * | 1998-09-30 | 2000-04-11 | Toshiba Corp | Clothes drier |
| JP2007289494A (en) * | 2006-04-26 | 2007-11-08 | Toshiba Corp | Clothes dryer |
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