Cleaning method for drying air duct filter screen of drying equipment and drying equipment

Abstract

The invention discloses a cleaning method for a filter screen of a drying air duct of drying equipment and the drying equipment, the drying equipment comprises a showering module used for spraying water flow to the filter screen to wash the filter screen, and after washing is completed, an air spraying module of the drying equipment is controlled to spray air flow to the filter screen so as to eliminate a water film on meshes of the filter screen. In the invention, after the water flow is sprayed to the filter screen to clean the filter screen, although thread scraps attached to the filter screen can be washed away by the water flow, part of the water flow is attached to the filter screen and forms a water film on the screen surface of the filter screen, and the water film is very firm and blocks the screen holes of the filter screen because the screen holes of the filter screen are very small; the air flow is sprayed to the filter screen after the water flow is sprayed, so that the water film can be effectively broken through by means of the impact force of the air flow, residual water attached to the filter screen is accelerated to leave the filter screen, the filter screen is kept smooth, and the drying efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of drying equipment, and in particular relates to a method for cleaning a filter screen of a drying air duct of a drying equipment and the drying equipment. Background Art

[0002] Drying equipment refers to equipment used to dry clothes, such as washing and drying machines, dryers, etc.

[0003] In order to realize the circulation of drying air in the drying air duct of the drying equipment, an air inlet for taking air into the drying barrel and an exhaust outlet for exhausting air to the outside of the drying barrel are provided on the drying barrel of the drying equipment. A filter is provided on the exhaust outlet to prevent lint in the drying barrel from entering the drying air duct and damaging the drying device.

[0004] During use, the lint will gradually clog the filter on the exhaust port, affecting the circulation of the drying airflow. Currently, the lint is generally removed by spraying water on the filter. However, after the lint is removed, the water remaining on the filter will form a solid water film on the surface of the filter, which will continue to hinder the circulation of the drying air.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The present invention proposes a method for cleaning a drying duct filter of a drying device and a drying device, the purpose of which is to eliminate the water film on the filter and avoid the water film formed by the water flow used to clean the filter remaining on the filter to hinder the drying air circulation.

[0007] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0008] A method for cleaning a drying duct filter of a drying device, the drying device comprising a shower module for spraying water to the filter to rinse the filter. After the rinsing is completed, the jet module of the drying device is controlled to spray air to the filter to eliminate the water film on the filter mesh.

[0009] Furthermore, the washing device includes a drying barrel connected to the drying air duct, and the inner side of the filter is arranged toward the inside of the drying barrel and the outer side is arranged toward the outside of the drying barrel;

[0010] Preset air pressure value P 0 After the water flushing is completed, the air pressure detection module is controlled to detect the air pressure value P outside the filter, and the detected air pressure value P is compared with the preset air pressure value P 0 The size of 0 , then the jet module is controlled to spray air toward the filter;

[0011] Among them, the air pressure value P 0It is the air pressure outside the filter that corresponds to the filter's passing efficiency meeting the drying requirements.

[0012] Furthermore, after each jet of airflow, the air pressure detection module is controlled to re-detect the air pressure value P outside the filter, and the detected air pressure value P is compared with the preset air pressure value P. 0 The size of 0 , the jet module is controlled to spray air toward the filter until the air pressure value P outside the filter is greater than the preset air pressure value P 0 .

[0013] Furthermore, if P≤P 0 , then the duration of controlling the jetting module to jet the airflow is negatively correlated with the detected air pressure value P.

[0014] Further, controlling and obtaining the air pressure value P outside the filter includes: presetting the time t 0 , obtain the drying duration t, and compare the obtained time t with the preset time t 0 The size of , if t ≥ t 0 , then the air pressure value P outside the filter is obtained;

[0015] Among them, the preset time t 0 It is the time required for the air pressure inside the filter to reach the drying pressure required.

[0016] Furthermore, the air pressure detection module is controlled to continuously detect the air pressure value P outside the filter screen during drying of the drying device, establish a relationship curve between the air pressure value P and the cumulative time T, and establish a fitting function P=f(T);

[0017] Preset drying time T m and minimum drying pressure P m , P=P m Substitute into P = f(T) to obtain the time T 1 , T = T 1 -T m Substitute into P = f(T) to obtain the pressure value P 1 , the air pressure value P 1 As the preset air pressure value P 0 ;

[0018] Among them, the drying time T m The time required to complete a drying cycle, the minimum drying pressure P m It is the minimum air pressure outside the filter that corresponds to the filter's passing efficiency meeting the drying requirements.

[0019] Furthermore, the drying device includes an identification module that can identify the type of attachment on the filter net. If P≤P 0, the control recognition module identifies the type of attachment on the filter net, and if it is determined that the attachment type is a water film, the control jet module sprays airflow to the filter net.

[0020] Furthermore, the identification module includes a light transceiver device arranged opposite to the filter screen, and the method for identifying the type of the attachment includes:

[0021] Preset light reflectivity G 0 , control the light transceiver to emit light to the filter, calculate the light reflectivity G according to the light intensity information received by the light transceiver, and compare the calculated reflectivity G with the preset light reflectivity G 0 The size of G≥G 0 , then the attachment type is determined to be water film.

[0022] Furthermore, the identification module includes an image acquisition device capable of acquiring an image of the attachment on the filter net, and the method for identifying the type of the attachment includes: controlling the image acquisition device to acquire the image of the attachment, and determining the type of the attachment according to the image information.

[0023] A drying device, comprising a drying barrel, an exhaust port provided on the drying barrel for communicating with a drying air duct, a filter screen provided on the exhaust port, a shower module for spraying water flow to the filter screen for washing the filter screen, and a controller electrically connected to the shower module, and also comprising an air jet module electrically connected to the controller, wherein the controller can control the air jet module to spray air flow to the filter screen for removing a water film on the filter screen;

[0024] Preferably, the spray module includes a spray head and a water inlet branch connected to the spray head, the jet module includes a spray head and an air inlet branch connected to the spray head, and the spray module and the jet module share a spray head.

[0025] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art.

[0026] 1. After spraying water to clean the filter, although the lint attached to the filter can be washed away by the water, some of the water will adhere to the filter and form a water film on the filter surface. Because the mesh of the filter is very small, the water film will be very strong and block the mesh of the filter, thereby hindering the flow of drying air in the drying equipment and reducing the drying efficiency. After spraying water, spraying air to the filter can effectively break the water film with the impact of the air flow and accelerate the residual water attached to the filter to leave the filter, so that the filter remains unobstructed.

[0027] 2. After spraying water on the filter to clean it, water film may not be formed on the filter. You can determine whether a water film has formed by measuring the air pressure value outside the filter. If the air pressure value outside the filter is lower than the preset air pressure value P0 , indicating that the drying air cannot pass through the filter normally, and there is a water film on the filter. It is necessary to spray air on the filter to eliminate the water film. Avoiding the spray of air when there is no water film will not only waste energy, but also delay the drying process.

[0028] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0030] Figure 1 This is a flow chart of a method for cleaning a filter screen in a drying duct of a drying device of the present invention;

[0031] Figure 2 It is a flow chart of another method for cleaning the filter screen of the drying duct of the drying equipment of the present invention;

[0032] Figure 3 This is another flow chart of a cleaning method for the drying air duct filter of the drying equipment of the present invention;

[0033] Figure 4 This is another flow chart of a cleaning method for the drying air duct filter of the drying equipment of the present invention;

[0034] Figure 5 This is another flow chart of a cleaning method for the drying air duct filter of the drying equipment of the present invention;

[0035] Figure 6 This is another flow chart of a cleaning method for the drying air duct filter of the drying equipment of the present invention;

[0036] Figure 7 This is another flow chart of a cleaning method for the drying air duct filter of the drying equipment of the present invention;

[0037] Figure 8 It is a schematic diagram of the positions of the drying barrel and the drying air duct of the drying equipment of the present invention;

[0038] Fig. 9 It is a partial structural schematic diagram of the drying equipment of the present invention;

[0039] Fig.10 The present invention Fig. 9 Schematic diagram from another perspective;

[0040] Fig.11It is the fitting curve diagram established in the present invention.

[0041] In the figure: 1. Drying barrel; 2. Exhaust outlet; 3. Drying air duct; 4. Spray head; 5. Support ribs; 6. Spray main pipe; 7. Air inlet branch; 8. Water inlet branch; 9. Three-way valve.

[0042] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0044] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] The present invention proposes a Figures 1 to 7 , Fig.11 The cleaning method of the filter screen of the drying duct 3 of the drying equipment shown in the figure and the cleaning method of the filter screen of the drying duct 3 of the drying equipment shown in the figure Figures 8 to 10 Drying equipment shown. Drying equipment refers to equipment used to dry clothes, such as a washing and drying machine and a drying machine. Drying equipment can be either washing and care equipment with drying function or equipment specifically used for drying.

[0047] The drying equipment includes a drying barrel 1 for accommodating items to be dried, such as clothes, and a drying device. The drying barrel 1 is provided with an air inlet for introducing drying air into the drying barrel 1 and an air outlet 2 for discharging hot and humid air out of the drying barrel 1. Generally speaking, the air inlet is arranged below the drying barrel 1, and the air outlet 2 is arranged above the drying barrel 1. For special drying equipment, the drying barrel 1 is a container for accommodating clothes, and for a washer-dryer, the drying barrel 1 is a barrel for accommodating washing water.

[0048] The drying device comprises a drying duct 3 connected to the air inlet and the air outlet 2 respectively. The drying air is heated in the drying duct 3 and enters the drying barrel 1, and is mixed with the steam evaporated from the clothes in the drying barrel 1 to form humid hot drying air, and then enters the drying duct 3 from the air outlet 2, and is dehumidified by the drying device and then reheated to form circulating drying air.

[0049] According to the needs of the drying equipment, the drying air duct 3 can also be set as two sections of air ducts respectively connected to the air inlet and the air outlet 2, and the drying air flows unidirectionally from the air inlet to the air outlet 2 without forming a cycle. Those skilled in the art can choose according to actual needs, and the present invention does not limit it.

[0050] The exhaust port 2 is provided with a filter, which covers the exhaust port 2. All drying air entering the drying air duct 3 from the drying barrel 1 through the exhaust port 2 must pass through the filter. During the drying process, lint will adhere to the filter along with the drying air, causing the filter to be blocked. Especially in a washing and drying machine, lint is more likely to block the filter during washing.

[0051] The drying device further comprises a spray module for spraying water flow to the filter screen and an air jet module for spraying air flow to the filter screen.

[0052] At present, the lint on the filter is generally cleaned by controlling the spray module to spray water onto the filter, but after the lint is cleaned, some water will adhere to the filter to form a water film. The water film will also block the drying air from passing through the filter.

[0053] The present invention proposes a Figures 1 to 7 , Fig.11 The method for cleaning the filter screen of the drying air duct 3 of the drying equipment shown in the figure is to remove the water film formed on the filter screen, such as Figure 1 As shown, the following methods can be adopted:

[0054] S1: Start;

[0055] S2: Control the spray module to spray water to the filter to wash the filter;

[0056] S3: Control the spray module to stop spraying water, and the flushing is completed;

[0057] S4: Control the jet module to spray air to the filter;

[0058] S5: End.

[0059] In step S4, the air flow is sprayed onto the filter to eliminate the water film on the mesh of the filter.

[0060] Specifically, the airflow jetted onto the filter should form a certain angle with the filter mesh surface. It is best if the jet direction of the airflow is perpendicular to the filter mesh surface to enhance the impact on the water film on the mesh.

[0061] In the present invention, after using water flow to clean the filter screen of the drying duct 3 of the drying equipment, air flow is sprayed onto the filter screen to break the water film on the filter screen mesh that is formed by residual water and closes the mesh opening, and the water is blown into the drying barrel 1 to evaporate and vaporize, thereby keeping the filter screen unobstructed and maintaining efficient drying.

[0062] As an embodiment of the present invention, the drying device includes a drying barrel 1 having an exhaust port 2 , and the filter screen arranged on the exhaust port 2 includes an inner screen surface facing the drying barrel 1 and an outer screen surface facing the outside of the drying barrel 1 .

[0063] Not every time you use water to clean the filter, a water film will form on the filter. If you use air flow to clean the filter even if no water film is formed after flushing the filter, it will not only waste energy but also delay drying. To solve this problem, Figure 2 As shown, the method is as follows:

[0064] S1: Start;

[0065] S2: Preset air pressure value P 0 ;

[0066] S3: Control the spray module to spray water to the filter to wash the filter;

[0067] S4: Control the spray module to stop spraying water, and the flushing is completed;

[0068] S5: Control and obtain the air pressure value P outside the filter;

[0069] S6: Compare the obtained air pressure value P with the preset air pressure value P 0 The size of 0 , then execute S7, otherwise execute S8;

[0070] S7: Control the jet module to jet air to the filter, and execute S8;

[0071] S8: End.

[0072] The washing device comprises a drying barrel 1 connected to a drying air duct 3 , and the inner side of the filter is arranged toward the inside of the drying barrel 1 , and the outer side is arranged toward the outside of the drying barrel 1 .

[0073] The air pressure value P in step S2 0 It is the air pressure outside the filter that corresponds to the filter's passing efficiency meeting the drying requirements.

[0074] Step S5 needs to be performed when the drying device is working and the drying air enters the drying duct 3 from the drying barrel 1 through the filter at the air outlet 2, because the air pressure in the drying barrel 1 and the drying duct 3 will increase to above the atmospheric pressure only when the drying device is drying. If the filter is blocked, part or even all of the drying air entering the drying barrel 1 cannot enter the drying duct 3 through the filter, so that the air pressure outside the filter cannot rise synchronously, and then it can be determined whether the filter is blocked by detecting the air pressure outside the filter.

[0075] Steps S3, S4, S6 and S7 can be performed when the drying device of the drying equipment is working, or when the drying equipment is stopped.

[0076] Preferably, step S7 is performed when the drying air stops, to prevent the wind pressure of the drying air flowing from the exhaust port 2 in the drying barrel 1 from offsetting the injected airflow and weakening the effect of the airflow on eliminating the water film.

[0077] After spraying water on the filter to clean it, water film may not be formed on the filter. You can determine whether a water film has formed by measuring the air pressure value outside the filter. If the air pressure value outside the filter is lower than the preset air pressure value P 0 , indicating that the drying air cannot pass through the filter normally, and there is a water film on the filter. It is necessary to spray air on the filter to eliminate the water film. Avoiding the spray of air when there is no water film will not only waste energy, but also delay the drying process.

[0078] As an implementation method of this embodiment, a single jet of airflow may not necessarily eliminate the water film. To solve this problem, Figure 3 As shown, the following methods can be adopted:

[0079] S1: Start;

[0080] S2: Preset air pressure value P 0 ;

[0081] S3: Control the spray module to spray water to the filter to wash the filter;

[0082] S4: Control the spray module to stop spraying water, and the flushing is completed;

[0083] S5: Control and obtain the air pressure value P outside the filter;

[0084] S6: Compare the obtained air pressure value P with the preset air pressure value P 0 The size of 0 , then execute S7, otherwise execute S8;

[0085] S7: Control the jet module to jet air to the filter. After the air jet is completed, execute S5;

[0086] S8: End.

[0087] In this embodiment, if a single water spray cannot completely remove the water film, multiple air jets are used to remove the water film, which can ensure the passing efficiency of the drying air when passing through the filter and ensure the drying effect.

[0088] Furthermore, in step S7, starting from the second airflow injection, the time of each airflow injection is gradually extended, such as 5 minutes for the first airflow injection and 10 minutes for the second airflow injection.

[0089] The difference between the water film on the filter and the lint is that after flushing, even if the lint is not completely flushed, the only lint produced by flushing will not return to the original position, so the impact effect of the water flow on the lint can be accumulated. However, the difference between the water film and the water film is that the water film may not be completely eliminated by using air flow to spray the water film. Even if part of the water film is eliminated, because the mesh of the filter is very small, the residual water on the filter may re-form a water film, that is, the characteristic of the water film is that it has a certain recovery ability.

[0090] Therefore, if the water film cannot be completely eliminated the first time, the restored water film must be eliminated again the second time. That is, the elimination effect cannot be accumulated. It is highly likely that the water film will not be eliminated the second time if the same time is taken as the first time.

[0091] Gradually extending the time of jetting airflow can enhance the water film elimination capability when the water film cannot be eliminated last time, thereby ensuring that the restored water film is effectively eliminated and avoiding multiple ineffective repeated jetting of water flow.

[0092] Or, if P≤P 0 , then the duration of controlling the jetting module to jet the airflow is negatively correlated with the detected air pressure value P.

[0093] If the water film cannot be completely eliminated the first time, the coverage area of ​​the water film on the filter screen may be different when the water film is eliminated for the second time compared with the first time. In this case, if the jetting time of the jet module is simply extended, excessive jetting may result in waste.

[0094] Controlling the jetting duration according to the detected air pressure value P can make the jetting duration more accurate, which can not only ensure the effective elimination of water film, but also avoid wasting time by excessive spraying.

[0095] As another implementation of this embodiment, the wind pressure of the drying air will not remain constant throughout the drying process of the drying device, but will change with different drying stages. For example, in the initial stage of drying, when the dryer has just started working, the wind pressure of the drying air is still very small. At this time, the air pressure value obtained outside the filter may not reach the preset air pressure value P 0 , but the filter may not be clogged at this time.

[0096] To avoid this, Figure 4 As shown, the method is as follows:

[0097] S1: Start;

[0098] S2: Preset air pressure value P 0 , time t 0 ;

[0099] S3: Drying starts;

[0100] S4: Obtain the drying duration t;

[0101] S5: Compare the acquired time t with the preset time t 0 The size of , if t ≥ t 0 , then execute S6, otherwise execute S4;

[0102] S6: Control and obtain the air pressure value P outside the filter;

[0103] S7: Compare the obtained air pressure value P with the preset air pressure value P 0 The size of 0 , then execute S8, otherwise execute S13;

[0104] S8: Control the spray module to spray water to the filter to wash the filter;

[0105] S9: Control the spray module to stop spraying water, and the flushing is completed;

[0106] S10: Control and obtain the air pressure value P outside the filter;

[0107] S11: Compare the obtained air pressure value P with the preset air pressure value P 0 The size of 0 , then execute S12, otherwise execute S13;

[0108] S12: Control the jet module to jet air to the filter. After the air jet is completed, execute S10;

[0109] S13: End.

[0110] Furthermore, the drying air can be turned off when the water flow is sprayed to prevent the wind pressure of the drying air from having a negative impact on the sprayed water flow. Figure 5 As shown, the specific method is as follows:

[0111] S1: Start;

[0112] S2: Preset air pressure value P 0 , time t 0 ;

[0113] S3: Drying starts,

[0114] S4: Obtain the drying duration t;

[0115] S5: Compare the acquired time t with the preset time t 0 The size of , if t ≥ t 0 , then execute S6, otherwise execute S4;

[0116] S6: Control and obtain the air pressure value P outside the filter;

[0117] S7: Compare the obtained air pressure value P with the preset air pressure value P 0 The size of 0 , then execute S8, otherwise execute S18;

[0118] S8: Drying off;

[0119] S9: Control the spray module to spray water to the filter to wash the filter;

[0120] S10: Control the spray module to stop spraying water, and the flushing is completed;

[0121] S11: Drying is turned on;

[0122] S12: Obtaining the drying duration t;

[0123] S13: Compare the acquired time t with the preset time t 0 The size of , if t ≥ t 0 , then execute S14, otherwise execute S12;

[0124] S14: Control and obtain the air pressure value P outside the filter;

[0125] S15: Compare the obtained air pressure value P with the preset air pressure value P 0 The size of 0 , then execute S16, otherwise execute S17;

[0126] S16: Control the jet module to jet air to the filter. After the air jet is completed, execute S14;

[0127] S17: Drying starts;

[0128] S18: End.

[0129] Among them, the preset time t 0 It is the time required for the air pressure inside the filter to reach the drying pressure required.

[0130] Of course, the timing of obtaining the pressure value P should not be too late, and it should be avoided when the drying is about to end. On the one hand, the drying air pressure may have begun to drop when the drying is about to end, resulting in the inability to detect the actual pressure situation. On the other hand, if the filter is clogged, it will also lead to poor drying effect.

[0131] The method for determining the timing of obtaining the pressure value P is not limited to using the drying time t. A pressure sensor that can detect air pressure can also be set on the inside of the filter. The air pressure value P outside the filter is obtained only after the air pressure monitored by the pressure sensor reaches the standard.

[0132] In this embodiment, by determining the timing for obtaining the air pressure value P, the accuracy of judging whether the filter is clogged can be effectively improved, thereby avoiding inaccurate judgment caused by obtaining the pressure value P when the drying air pressure itself does not reach the normal working level.

[0133] As another implementation of this embodiment, the preset air pressure value P 0 The method comprises: controlling the air pressure detection module to continuously detect the air pressure value P outside the filter screen during drying of the drying equipment, establishing a relationship curve between the air pressure value P and the cumulative time T, and establishing a fitting function P=f(T);

[0134] Preset drying time T m and minimum drying pressure P m , P=P m Substitute into P = f(T) to obtain the time T 1 , T = T 1 -T m Substitute into P = f(T) to obtain the pressure value P 1 , the air pressure value P 1 As the preset air pressure value P 0 .

[0135] Among them, the drying time T m The time required to complete a drying cycle, the minimum drying pressure P m It is the minimum air pressure outside the filter that corresponds to the filter's passing efficiency meeting the drying requirements.

[0136] The function curve refers to a function curve formed by accumulating data in multiple consecutive drying processes, rather than a function curve of a certain drying process. It covers the whole process from the filter being completely free of wire chips to the filter being completely blocked by wire chips, and the air pressure value outside the filter dropping from the peak value to 0.

[0137] like Fig.11 As shown, for example, in a certain measurement, the data of the air pressure value P outside the filter of the drying equipment changing with time T is detected until the air pressure value P outside the filter is 0 (or close to 0). A plane rectangular coordinate system is established with the air pressure value P as the ordinate and the time T as the abscissa, and the obtained data of the air pressure value P changing with time T is plotted according to (T, P), and a curve is obtained in which the air pressure value P gradually decreases with time T, and the fitting curve P=f(T) is calculated to be P=-0.0014T 2 -0.7483T+2437.9, after calculation, the pressure value P=1540Pa is the pressure value that meets the above requirements, and P can be set 0 =P = 1540Pa

[0138] Although cleaning the filter can improve the drying efficiency to a certain extent, flushing the filter itself will take up a lot of time and delay the drying process. In addition, when using water to flush the filter, the water will also enter the drying barrel 1, increasing the total amount of water required for drying in the drying barrel 1 and extending the drying time. Therefore, if the drying can be completed, try not to clean it.

[0139] In this embodiment, the preset pressure value P is selected by fitting the curve P=f(T) 0 , ensuring that the filter's passing efficiency can meet the drying needs during this drying process, avoiding the situation where the filter's passing efficiency may meet the drying needs at the beginning of drying, but the filter becomes more clogged during the drying process and cannot meet the drying needs, ensuring efficient completion of drying.

[0140] As another implementation of this embodiment, after the water flow is flushed, if the air pressure value P outside the filter is still less than the preset air pressure value P 0 , it may be that there is a water film on the mesh of the filter, or it may be that the lint on the filter is not cleaned up. If the air flow is directly injected, the lint cannot be effectively cleaned. To solve this problem, Figure 6 As shown, the method is as follows:

[0141] S1: Start;

[0142] S2: Preset air pressure value P 0 ;

[0143] S3: Control the spray module to spray water to the filter to wash the filter;

[0144] S4: Control the spray module to stop spraying water, and the flushing is completed;

[0145] S5: Control and obtain the air pressure value P outside the filter;

[0146] S6: Compare the obtained air pressure value P with the preset air pressure value P 0 The size of 0 , then execute S7, otherwise execute S10;

[0147] S7: controlling the identification module to identify the type of attachment on the filter;

[0148] S8: Determine the type of attachment. If the attachment type is determined to be a water film, execute S9; otherwise, execute S3.

[0149] S9: Control the jet module to jet air to the filter. After the air jet is completed, execute S5;

[0150] S10: End.

[0151] The drying device comprises an identification module capable of identifying the type of attachments on the filter net.

[0152] The identification module may also perform judgment only after the water flow flushing is completed, and not perform judgment after the air flow flushing is completed.

[0153] In this embodiment, after the filter is cleaned by the jet of water, if the other air pressure outside the filter cannot reach the preset air pressure value P 0 The above determines the type of blockage on the filter. If it is wire scraps, use water to flush it. If it is a water film, use air flow to clean it. This is more targeted and helps improve cleaning efficiency.

[0154] Furthermore, the identification module includes a light transceiver device arranged opposite to the filter screen, and the method for identifying the type of the attachment includes: presetting the light reflectivity G 0 , control the light transceiver to emit light to the filter, calculate the light reflectivity G according to the light intensity information received by the light transceiver, and compare the calculated reflectivity G with the preset light reflectivity G 0 The size of G≥G 0 , then the attachment type is determined to be water film.

[0155] Specifically, the light transceiver device may include a light transmitter and a light receiver. The light emitted by the light transmitter is irradiated onto the filter, reflected by the mesh surface of the filter, and irradiated onto the light receiver. The light reflection ability of the water film is obviously higher than that of the wire scraps, so the type of the attachment on the filter can be determined by the light emission rate.

[0156] The light transceiver device can be installed in the drying duct 3 outside the filter. In this way, the risk of being damaged by the clothes in the drying barrel 1 is avoided. Especially for a washing and drying machine, the risk of water flowing into the light transceiver device causing a short circuit is avoided. At the same time, the problem of wire scraps blocking the light transceiver device and affecting the detection of the filter is also avoided.

[0157] The use of a light transceiver device to detect the type of attachments on the filter net is less susceptible to external interference and is simple to implement.

[0158] Alternatively, the identification module includes an image acquisition device capable of acquiring an image of the attachment on the filter net, and the method for identifying the type of the attachment includes: controlling the image acquisition device to acquire the image of the attachment, and determining the type of the attachment according to the image information.

[0159] The image acquisition device may include a camera, which is installed in the drying air duct 3 outside the filter and is used to acquire image information of the filter surface.

[0160] After using water to clean, it is possible that the lint is not rinsed clean, but the residual water attached to the filter soaks the lint on the filter, increasing the light reflectivity of the lint surface. In this case, the method of measuring the light reflectivity may cause misjudgment.

[0161] Using image analysis methods, the software can be trained to enable the recognition module to distinguish between water film, thread scraps, soaked thread scraps, coexistence of thread scraps and water film, and use a jet of water to clean the filter when thread scraps are present. Alternatively, the thread scrap blocking ratio can be calculated. When thread scraps and water film coexist, if the proportion of thread scraps is small, it can be ignored and the water film can be directly eliminated by jetting water, greatly improving the accuracy of filter drying.

[0162] As another implementation of this embodiment, in actual use, the wire scraps will stick to the filter screen after drying, and the use of a water jet may not be able to clean the wire scraps. Repeated flushing not only wastes water, but also delays drying. To solve this problem, Figure 7 As shown, the method is as follows:

[0163] S1: Start;

[0164] S2: Preset air pressure value P 0 、N number of injections 0 ;

[0165] S3: Control the spray module to spray water to the filter to wash the filter;

[0166] S4: Control the spray module to stop spraying water, and the flushing is completed;

[0167] S5: Control and obtain the air pressure value P outside the filter;

[0168] S6: Compare the obtained air pressure value P with the preset air pressure value P 0 The size of 0 , then execute S7, otherwise execute S11;

[0169] S7: Control the jet module to jet air to the filter. After the air jet is completed, execute S8;

[0170] S8: Control to obtain the cumulative number of injections N;

[0171] S9: Compare the accumulated injection number N with the preset injection number N 0 The size of N≥N 0 , then execute S10, otherwise execute S5;

[0172] S10: Control the drying device to output a warning message to remind the user that the filter is clogged, and then execute S11;

[0173] S11: End.

[0174] The accumulated number of injections N obtained in step S8 may refer to the total number of injections of water and air, or the number of injections of air. If there are multiple injections of water, it may also refer to the number of injections of water.

[0175] The warning information output in step S10 may be displayed through a display panel, a display light, etc. of the drying device itself, or may be output through a mobile terminal that is communicatively connected to the drying device to prompt the user.

[0176] In this embodiment, by limiting the number of water and air jets, water is avoided from being wasted when the water and air jets are not sufficient to clean the filter, and danger caused by excessive drying air pressure in the drying barrel 1 is avoided.

[0177] The present invention also proposes a Figures 8 to 10 The drying device shown is controlled by the drying air duct 3 filter cleaning method of the present invention. The drying device includes a drying barrel 1 for accommodating articles to be dried such as clothes and a drying device. The drying barrel 1 is provided with an air inlet for introducing drying air into the drying barrel 1 and an air outlet 2 for discharging hot and humid gas out of the drying barrel 1. Generally speaking, the air inlet is arranged below the drying barrel 1, and the air outlet 2 is arranged above the drying barrel 1.

[0178] The drying device comprises a drying duct 3 connected to the air inlet and the air outlet 2 respectively. The drying air is heated in the drying duct 3 and enters the drying barrel 1, and is mixed with the steam evaporated from the clothes in the drying barrel 1 to form humid hot drying air, and then enters the drying duct 3 from the air outlet 2, and is dehumidified by the drying device and then reheated to form circulating drying air.

[0179] According to the needs of the drying equipment, the drying air duct 3 can also be set to two sections connected to the air inlet and the air outlet 2 respectively, and the drying air flows unidirectionally from the air inlet to the air outlet 2 without forming a cycle. Those skilled in the art can choose according to actual needs, and the present invention does not limit it.

[0180] The exhaust port 2 is provided with a filter screen, which covers the exhaust port 2, and the drying air from the drying barrel 1 into the drying air duct 3 through the exhaust port 2 must pass through the filter screen. The drying device also includes a spray module for spraying water flow to the filter screen and a jet module for spraying air flow to the filter screen.

[0181] like Fig. 9 , Fig.10 As shown, the drying air duct 3 connected to the air outlet 2 is formed by a circular pipe and communicates with the circular air outlet 2. The drying device includes a shower module for spraying water to the filter to wash the filter and a jet module for spraying air to the filter to eliminate the water film of the filter.

[0182] The drying equipment also includes a controller, which is electrically connected to the jet module and the spray module respectively, and can control the jet module to spray air flow to the filter to eliminate the water film on the filter, and control the spray module to spray water to the filter to clean the filter.

[0183] Preferably, the spray module includes a spray head 4 and a water inlet branch 8 connected to the spray head 4, the jet module includes a spray head 4 and an air inlet branch 7 connected to the spray head 4, and the spray module and the jet module share one spray head 4.

[0184] The drying device further comprises a three-way valve 9 with two inlets and one outlet, wherein the outlet of the three-way valve 9 is connected to the spray head 4, and the two inlets are respectively connected to the air inlet branch 7 and the water inlet branch 8.

[0185] The spray head 4 is arranged in the drying air duct 3 along the radial direction of the air inlet. The drying device includes an air pressure detection module for detecting the air pressure value outside the filter. The air pressure detection module includes an air pressure sensor arranged outside the filter.

[0186] Furthermore, the three-way valve 9 is connected to the spray head 4 through the spray main pipe 6 penetrating the side wall of the drying air duct 3, and the three-way valve 9, the air inlet branch 7, and the water inlet branch 8 are arranged outside the drying air duct 3. The water inlet branch 8 is connected to a pressurized water source, and the air inlet branch 7 is connected to a pressurized air source.

[0187] In the present invention, only one spray head 4 can be used to spray water flow and air flow, and the switching of water flow and air flow can be achieved by switching the three-way valve 9, thereby completing the cleaning process of using water flow to clean wire scraps and using air flow to clean the water film.

[0188] As an embodiment of the present invention, the spray head 4 extends along the radial direction of the air outlet 2, and the air outlet 2 is provided with a plurality of spray holes arranged at intervals along the extending direction of the spray head 4, and the spray holes are arranged toward the filter screen.

[0189] Using the injection hole to spray water and air can ensure the flow rate of the air flow, and then ensure the impact force of the air flow on the water film, avoiding the opening of the air flow sprayed from the injection head 4 being too large, resulting in insufficient air flow pressure and insufficient to eliminate the water film.

[0190] Furthermore, the exhaust port 2 is provided with support ribs 5 arranged along the radial direction of the exhaust port 2, which are used to support the filter screen. The extension direction of the injection head 4 is the same as that of the support ribs 5. The injection head 4 is provided with two rows of injection holes, one row of injection holes is inclined toward the filter screen on one side of the support ribs 5, and the other row of injection holes is inclined toward the filter screen on the other side of the support ribs 5, that is, the injection direction of the injection holes avoids the support ribs 5.

[0191] By providing the supporting ribs 5, the stability and durability of the filter screen are ensured, and the filter screen is prevented from being dried by wind and sprayed by water.

[0192] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A method for cleaning a filter screen of a drying duct of a drying device, wherein the drying device comprises a shower module for spraying water flow to the filter screen to wash the filter screen, Features: After the flushing is completed, the jet module of the drying equipment is controlled to spray air to the filter to eliminate the water film on the filter mesh.

2. A method for cleaning a drying duct filter of a drying equipment according to claim 1, Features: The washing device includes a drying barrel connected to a drying air duct, wherein the inner side of the filter screen is arranged toward the inside of the drying barrel and the outer side is arranged toward the outside of the drying barrel; Preset air pressure value P 0 After the water flushing is completed, the air pressure detection module is controlled to detect the air pressure value P outside the filter, and the detected air pressure value P is compared with the preset air pressure value P 0 The size of 0 , then the jet module is controlled to spray air toward the filter; Among them, the air pressure value P 0 It is the air pressure outside the filter that corresponds to the filter's passing efficiency meeting the drying requirements.

3. A method for cleaning a drying duct filter of a drying equipment according to claim 2, Features: After each jet of airflow, the air pressure detection module is controlled to re-detect the air pressure value P outside the filter, and compare the detected air pressure value P with the preset air pressure value P. 0 The size of 0 , the jet module is controlled to spray air toward the filter until the air pressure value P outside the filter is greater than the preset air pressure value P 0 .

4. A method for cleaning a drying air duct filter of a drying equipment according to claim 3, Features: If P≤P 0 , then the duration of controlling the jetting module to jet the airflow is negatively correlated with the detected air pressure value P.

5. A method for cleaning a drying duct filter of a drying equipment according to any one of claims 2 to 4, Features: Controlling the acquisition of the air pressure value P outside the filter includes: preset time t 0 , obtain the drying duration t, and compare the obtained time t with the preset time t 0 The size of , if t ≥ t 0 , then the air pressure value P outside the filter is obtained; Among them, the preset time t 0 It is the time required for the air pressure inside the filter to reach the drying pressure required.

6. A method for cleaning a drying air duct filter of a drying equipment according to any one of claims 2 to 4, Features: Control the air pressure detection module to continuously detect the air pressure value P outside the filter screen during drying of the drying equipment, establish a relationship curve between the air pressure value P and the cumulative time T, and establish a fitting function P = f(T); Preset drying time T m and minimum drying pressure P m , P=P m Substitute into P = f(T) to obtain the time T 1 , T = T 1 -T m Substitute into P = f(T) to obtain the pressure value P 1 , the air pressure value P 1 As the preset air pressure value P 0 ; Among them, the drying time T m The time required to complete a drying cycle, the minimum drying pressure P m It is the minimum air pressure outside the filter when the filter's passing efficiency meets the drying requirements.

7. A method for cleaning a drying duct filter of a drying equipment according to any one of claims 2 to 4, Features: The drying device includes an identification module that can identify the type of attachment on the filter. If P≤P 0 , the control recognition module identifies the type of attachment on the filter net, and if it is determined that the attachment type is a water film, the control jet module sprays airflow to the filter net.

8. A method for cleaning a drying duct filter of a drying equipment according to claim 7, Features: The identification module includes a light transceiver device arranged opposite to the filter screen, and the method for identifying the type of attachment includes: Preset light reflectivity G 0 , control the light transceiver to emit light to the filter, calculate the light reflectivity G according to the light intensity information received by the light transceiver, and compare the calculated reflectivity G with the preset light reflectivity G 0 The size of G≥G 0 , then the attachment type is determined to be water film.

9. A method for cleaning a drying air duct filter of a drying equipment according to claim 7, Features: The recognition module includes an image acquisition device that can acquire an image of the attachment on the filter net. The method for identifying the type of the attachment includes: controlling the image acquisition device to acquire the image of the attachment, and determining the type of the attachment according to the image information.

10. A drying device, comprising a drying barrel, an exhaust port provided on the drying barrel for communicating with a drying air duct, a filter screen provided on the exhaust port, a shower module for spraying water to the filter screen to wash the filter screen, and a controller electrically connected to the shower module, Features: It also includes an air jet module electrically connected to the controller, and the controller can control the air jet module to spray air to the filter screen to eliminate the water film on the filter screen; Preferably, the spray module includes a spray head and a water inlet branch connected to the spray head, the jet module includes a spray head and an air inlet branch connected to the spray head, and the spray module and the jet module share a spray head.

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