Patent Publication Number: US-2022213634-A1

Title: Atomizing generator and clothes treatment apparatus comprising the atomizing generator

Description:
FIELD 
     The present invention relates to the technical field of clothes treatment, and more particularly, to an atomizing generator and a clothes treatment apparatus including the same. 
     BACKGROUND 
     As science and technology are developing and the living standard has improved, the household appliances have a trend of becoming multifunctional. Taking washing machines as an example, most of them have a steam washing function (or air washing) among others, the steam washing function is realized by an atomizing generator of which an atomizing element atomizes a liquid into steam and then sprays the steam into a washing drum through an atomizing pipe to treat clothes in the drum, so that clothes caring, such as wrinkle removal and peculiar smell dispelling, can be realized. 
     Typically, an atomizing generator includes a housing provided with an air inlet, a liquid inlet, and a mist outlet thereon, and only an atomizing element therein; whilst a circuit board for controlling the atomizing element is provided in the washing machine and is integrated with a control unit of the washing machine or shares one control box. This arrangement simplifies the structure of the atomizing generator but is disadvantageous for the assembling and production of the washing machine, as a result, the atomizing generator and the circuit board have to be mounted separately and then coupled through signal wires to assemble the washing machine, which greatly reduces the production efficiency and the yield. 
     Accordingly, there is a need in the art for a new atomizing generator that addresses the above problems. 
     SUMMARY 
     The present invention provides an atomizing generator to solve the above-mentioned problem in the prior art of low production efficiency of a clothes treating apparatus caused by low integration of a conventional atomizing generator. The atomizing generator includes a housing provided with a partition plate therein, the partition plate dividing the housing into an atomizing cavity and a mounting cavity which are communicated with each other, and the atomizing cavity being capable of containing a liquid. The housing is provided with an air inlet, a liquid inlet and a mist outlet which are communicated with the atomizing cavity, the atomizing generator further includes an atomizing element capable of atomizing the liquid in the atomizing cavity, a controller is provided in the mounting cavity, and the controller is connected to the atomizing element through a control wire to control the start/stop of the atomizing element. 
     In a preferred technical solution of the atomizing generator, a bottom of the housing is provided with a water-permeable hole, and an atomizing film is fixed by an atomizing film holder outside the housing corresponding to the water-permeable hole. 
     In a preferred technical solution of the atomizing generator, the atomizing element is an ultrasonic atomizing film, a driving circuit board used for driving the ultrasonic atomizing film is further mounted in the atomizing film holder, a threading hole is formed in a bottom surface of the mounting cavity, and the control wire has one end connected to the driving circuit board and the other end connected to the controller through the threading hole. 
     In a preferred technical solution of the atomizing generator, the air inlet is disposed at a position on the housing corresponding to the mounting cavity, an air flow passage is formed between the air inlet and the mist outlet, and the air flow passage goes through part of the controller. 
     In a preferred technical solution of the atomizing generator, the housing includes a housing body and a housing cover, the partition plate is disposed in the housing body and is provided with a notch, and the notch is arranged corresponding to the controller. 
     In a preferred technical solution of the atomizing generator, a wind shield extends downwards from the housing cover, and the wind shield extends into the atomizing cavity and is arranged corresponding to the notch. 
     In a preferred technical solution of the atomizing generator, a fan is provided between the air inlet and the controller, an air indrawing opening of the fan is arranged corresponding to the air inlet, an air exhaust opening of the fan is arranged to face the partition plate, and the controller is connected to the fan to control the start/stop of the fan. 
     In a preferred technical solution of the atomizing generator, a communicating cavity is further provided in the housing, the atomizing cavity is communicated with the communicating cavity through a first communication hole, and the mist outlet is communicated with the communicating cavity through a second communication hole. 
     In a preferred technical solution of the atomizing generator, the mist outlet is disposed on a bottom surface of the housing, the atomizing generator further includes a connecting pipe, and the mist outlet is communicated with the second communication hole through the connecting pipe; additionally/alternatively, a valve mechanism is further provided in the communicating cavity, the valve mechanism is configured to be capable of sealing the first communication hole and/or the second communication hole, and the controller is connected to the valve mechanism to control the opening/closing of the valve mechanism. 
     The present invention further provides a clothes treatment apparatus which includes a tank, a washing drum and a control unit, the washing drum and the control unit are arranged in the tank. The clothes treatment apparatus further includes the atomizing generator according to any of the above preferred technical solutions, the liquid inlet is communicated with a water source through a liquid inlet pipe, the mist outlet is communicated with the washing drum through a mist outlet pipe, and the controller is connected to the control unit through a cable. 
     As appreciated by those skilled in the art, in the preferred technical solutions of the present invention, the atomizing generator includes a housing, a partition plate being provided within the housing, the partition plate dividing the housing into an atomizing cavity and a mounting cavity which are in communication with each other; the atomizing cavity can accommodate liquid, an air inlet, a liquid inlet and a mist outlet which are in communication with the atomizing cavity are provided on the housing; the atomizing generator further includes an atomizing element capable of atomizing the liquid within the atomizing cavity; a controller is provided in the mounting cavity, and the controller is connected to the atomizing element by means of a control wire to control the start/stop of the atomizing element. 
     The arrangement described above greatly improves the integration level of the atomizing generator, and thus it is much easier to assemble the clothes treatment apparatus, which facilitates assembling and production, and in turn, increases the assembling efficiency and the yield. Specifically, the partition plate is provided in the housing to divide the housing into the atomizing cavity and the mounting cavity, and the controller connected to the atomizing element is provided in the mounting cavity, so that the controller and the atomizing element are assembled well before delivery, which simplified the subsequent assembling process because it would be enough to connect the controller with the control unit of the clothes treatment apparatus when mounting the atomizing generator. 
     Furthermore, the arrangement where the air inlet is arranged at the position of the housing corresponding to the mounting cavity, the air flow passage is formed between the air inlet and the mist outlet, and the air flow passage flows part of the controller enables that part of heat of the controller can be dissipated by ambient air entering the housing from the air inlet, the controller is thus effectively cooled, and the reliability and the service life of the controller are greatly improved. 
     The present invention also provides an atomizing generator which includes a housing provided with an atomizing cavity therein, an atomizing element capable of atomizing a liquid is provided in the atomizing cavity, an air inlet, a liquid inlet, and a mist outlet which are communicated with the atomizing cavity are provided on the housing, and a communicating cavity which is independent of the atomizing cavity is formed in the housing. The atomizing cavity is communicated with the communicating cavity through a first communication hole, the mist outlet is communicated with the communicating cavity through a second communication hole, a valve mechanism is further provided in the communicating cavity, and the valve mechanism is configured to be capable of sealing the first communication hole and/or the second communication hole. 
     In a preferred embodiment of the atomizing generator, the valve mechanism includes a drive portion and a sealing block, the drive portion being capable of driving the sealing block to slide reciprocally within the communicating cavity. 
     In a preferred technical solution of the atomizing generator, the housing includes a housing body and a first housing cover, wherein a transverse rib and a vertical rib are provided on the first housing cover, the transverse rib is fixedly connected to three sequentially adjacent inner side surfaces of the first housing cover, and the vertical rib is fixedly connected to two opposite ones of the three sequentially adjacent inner side surfaces, so that the transverse rib, the vertical rib and the three inner side surfaces jointly enclose the communicating cavity. 
     In a preferred embodiment of the atomizing generator, the housing further includes a second housing cover capable of covering the communicating cavity. 
     In a preferred technical solution of the atomizing generator, the first communication hole and the second communication hole are arranged on the transverse rib, the mist outlet is disposed at a bottom of the housing, the atomizing generator further includes a connecting pipe, and the mist outlet is connected to the second communication hole through the connecting pipe. 
     In a preferred technical solution of the atomizing generator, a partition plate is provided in the housing and divides the housing into a mounting cavity and the atomizing cavity, a controller is provided in the mounting cavity and is connected to the atomizing element and the valve mechanism, respectively, to control the start/stop of the atomizing element and the opening/closing of the valve mechanism. 
     In a preferred technical solution of the atomizing generator, the partition plate is provided with a notch, a wind shield extends downwards from a bottom surface of the transverse rib, and the wind shield extends into the atomizing cavity and is arranged corresponding to the notch. 
     In a preferred technical solution of the atomizing generator, the air inlet is provided with a fan, and the controller is further connected to the fan to control the start/stop of the fan. 
     In a preferred technical solution of the atomizing generator, the atomizing element is an ultrasonic atomizing film, a bottom of the housing is provided with a water-permeable hole, and the ultrasonic atomizing film is placed outside the housing corresponding to the water-permeable hole. 
     The present invention also provides a clothes treatment apparatus which includes a tank and a washing drum in the tank, wherein the clothes treatment apparatus further includes a drying module and the atomizing generator according to any of the preferred technical solutions, the liquid inlet of the atomizing generator is communicated with a water source through a liquid inlet pipe, and the mist outlet is communicated with the washing drum through a mist outlet pipe. 
     As appreciated by those skilled in the art, in the preferred technical solutions of the present invention, the atomizing generator includes the housing provided with the atomizing cavity therein, the atomizing element capable of atomizing a liquid is provided in the atomizing cavity, the air inlet, the liquid inlet and the mist outlet which are communicated with the atomizing cavity are provided on the housing, and the communicating cavity which is independent of the atomizing cavity is also formed in the housing; the atomizing cavity is communicated with the communicating cavity through the first communication hole, the mist outlet is communicated with the communicating cavity through the second communication hole, the valve mechanism is further provided in the communicating cavity, and the valve mechanism is configured to be capable of sealing the first communication hole and/or the second communication hole. 
     The arrangement of the communicating cavity in the atomizing generator and of the valve mechanism in the communicating cavity enables greatly improved safety of operating the washing machine when the atomizing generator is implemented in a washing machine having a drying module because a situation where electrical elements are affected with dampness and short-circuited due to damp-heat air flows back to the atomizing generator and an interior of the washing machine when the drying module is started is effectively avoided. Specifically, the communicating cavity which is independent of the atomizing cavity is provided in the housing, and the atomizing cavity is communicated with the mist outlet through the communicating cavity, hence the communicating cavity becomes a passage necessary for the mist to reach the mist outlet from the atomizing cavity. The arrangement where the valve mechanism is provided in the communicating cavity and can seal the first communication hole and/or the second communication hole enables that the passage can be completely cut off by the valve mechanism, and thus an air flow from the exterior is prevented from flowing back to the atomizing generator through the mist outlet, in particular, failures such as short-circuited electrical elements, affected with damp, in the atomizing generator and the washing machine are avoided because the humid air in the washing drum can be prevented from flowing back to the atomizing generator and then is discharged into the washing machine from the air inlet when the drying module of the washing machine is started, as a result, the safety of operating the washing machine is greatly improved. Moreover, such an arrangement has high feasibility and excellent effects, advantageous for mass promotion and application. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       Hereinafter, an atomizing generator of the present invention and a clothes treating apparatus including the same will be described with reference to the accompanying drawings in conjunction with a drum washing machine. In the drawings: 
         FIG. 1  is a schematic view showing a structure of a drum washing machine according to Embodiment 2 of the present invention; 
         FIG. 2  is an external view (I) of an atomizing generator according to Embodiment 2 of the present invention; 
         FIG. 3  is an external view (II) of the atomizing generator according to Embodiment 2 of the present invention; 
         FIG. 4  is a structural view of the atomizing generator according to Embodiment 2 of the present invention with the second housing cover removed; 
         FIG. 5  is a structural view showing an interior of a housing body of the atomizing generator according to Embodiment 2 of the present invention; 
         FIG. 6  is a cross-sectional view of  FIG. 2  at C-C; 
         FIG. 7  is a structural view (I) of a first housing cover of the atomizing generator according to Embodiment 2 of the present invention; 
         FIG. 8  is a structural view (II) of the first housing cover of the atomizing generator according to Embodiment 2 of the present invention. 
     
    
    
     LIST OF REFERENCE NUMERALS 
       1 . tank;  2 . inner drum;  3 . outer drum;  4 . atomizing generator;  41 . housing;  411 . housing body;  4111 . air inlet;  4112 . liquid inlet;  4113 . mist outlet;  412 . first housing cover;  413 . second housing cover;  414 . transverse rib;  4141 . first communication hole;  4142 . second communication hole;  4143 . wind shield;  415 . vertical rib;  416 . atomizing film holder;  417 . partition plate;  4171 . notch;  42 . atomizing cavity;  43 . mounting cavity;  44 . atomizing element;  45 . valve mechanism;  451 . drive portion;  452 . sealing block;  46 . connecting pipe;  47 . controller;  48 . fan;  5 . drying module;  6 . liquid inlet pipe;  7 . mist outlet pipe;  8 . electromagnetic valve. 
     DETAILED DESCRIPTION 
     Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. As appreciated by those skilled in the art, these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of the present invention. For example, although the embodiments are described in connection with a drum washing machine, it is not intended to limit the scope of the present invention, and the present invention may be applied to other clothes treating apparatuses such as a pulsator washing machine or a washing and drying machine. 
     It is to be understood that in the description of the present invention, terms such as “center”, “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “inner” and “outer” refer to directions or positional relationships based on those shown in the drawings for ease of description only, rather than indicate or imply that the device or element must have a particular orientation or be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. Furthermore, terms such as “first”, “second” and “third” are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance. 
     Furthermore, it is to be understood that in the description of the present invention, terms such as “mounted”, “connected” and “coupled” are to be interpreted broadly, for example, fixedly, removably, or integrally; either mechanically or electrically; either directly or indirectly through an intermediary; or internally between two elements. The specific meaning of the above terms in the present invention will be understood by those skilled in the art as appropriate. 
     The drum washing machine of the present invention will now be described with reference to  FIGS. 1 to 5 , wherein  FIG. 1  is a schematic view showing a structure of a drum washing machine according to Embodiment 2 of the present invention;  FIG. 2  is an external view (I) of an atomizing generator according to Embodiment 2 of the present invention;  FIG. 3  is an external view (II) of the atomizing generator according to Embodiment 2 of the present invention;  FIG. 4  is a structural view of the atomizing generator according to Embodiment 2 of the present invention with the second housing cover removed;  FIG. 5  is a structural view showing an interior of a housing body of the atomizing generator according to Embodiment 2 of the present invention. 
     As shown in  FIG. 1 , to solve the problem that the safety of operating the washing machine is seriously affected by the damp-heat air in the washing drum flows back to the atomizing generator and the inside of the washing machine when the drying module of the conventional washing machine is working, the drum washing machine mainly includes a tank  1 , and an inner drum  2 , an outer drum  3 , an atomizing generator  4  and a drying module  5  provided in the tank  1 . The inner drum  2  is used for containing clothes, and the drying module  5  is circularly communicated with the outer drum  3  to dry clothes in the inner drum  2  by providing a hot air flow to the outer drum  3  and the inner drum  2 . The atomizing generator  4  is communicated with the water source through the liquid inlet pipe  6  and the electromagnetic valve  8 , and is communicated with the outer drum  3  through the mist outlet pipe  7 ; when the atomizing generator  4  is working, the water enters the atomizing generator  4  through the electromagnetic valve  8  and the liquid inlet pipe  6  from the water source, the atomizing generator  4  atomizes the water into mist, and the mist is sprayed to the inner drum  2  through the mist outlet pipe  7  to treat clothes in the inner drum  2 . 
     Referring to  FIGS. 2 and 5 , the atomizing generator  4  includes the housing  41  provided therein with the atomizing cavity  42  capable of storing water, the atomizing element  44  capable of atomizing water is provided in the atomizing cavity  42 , and the air inlet  4111 , the liquid inlet  4112  and the mist outlet  4113  which are communicated with the atomizing cavity  42  are provided on the housing  41 , the liquid inlet  4112  being connected to the liquid inlet pipe  6 , and the mist outlet  4113  being connected to the mist outlet pipe  7 . Specifically, referring to  FIG. 4 , the communicating cavity (not shown) independent of the atomizing cavity  42  is further formed in the housing  41 , the atomizing cavity  42  is communicated with the communicating cavity through the first communication hole  4141  (shown in  FIG. 7 ), and the mist outlet  4113  is communicated with the communicating cavity through the second communication hole  4142 . The valve mechanism  45  is further provided in the communicating cavity and is configured to be capable of sealing the first communication hole  4141  and the second communication hole  4142  simultaneously. 
     When the drying module  5  is working, the drying module  5  releases a large amount of hot air flow into the outer drum  3  and the inner drum  2  to dry clothes. In the drying process, the pressure in the drum is increased, and the humidity of the air is obviously increased as clothes is dried, as a result, the damp-heat air easily flows back to the atomizing generator  4  through the mist outlet pipe  7  and is then expelled to the interior of the washing machine from the air inlet  4111 , consequently, the electrical elements in the atomizing generator  4  and inside the washing machine are short-circuited due to damp, which leads to safety issues. At this time, the first communication hole  4141  and the second communication hole  4142  are sealed by the control valve mechanism  45  so that the passage between the mist outlet  4113  and the atomizing cavity  42  is blocked. 
     As can be seen from the above description, in the present invention, the arrangement of the communicating cavity in the atomizing generator  4  and of the valve mechanism  45  in the communicating cavity greatly improves the safety of operating the washing machine and effectively avoids a situation where electric elements are short-circuited due to dampness because damp-heat air flows back to the atomizing generator  4  and the inside of the washing machine when the drying module  5  is started. Specifically, the communicating cavity which is independent of the atomizing cavity  42  is provided in the housing  41 , and the atomizing cavity  42  is communicated with the mist outlet  4113  through the communicating cavity, hence the communicating cavity becomes a passage necessary for the mist to reach the mist outlet  4113  from the atomizing cavity  42 . The arrangement where the valve mechanism  45  is provided in the communicating cavity and can seal the first communication hole  4141  and/or the second communication hole  4142  enables that the passage can be completely cut off by the valve mechanism  45 , and thus an air flow from the exterior is prevented from flowing back to the atomizing generator  4  through the mist outlet  4113 , in particular, failures such as short-circuited electrical elements, affected with damp, in the atomizing generator  4  and the washing machine are avoided because the humid air in the washing drum can be prevented from flowing back to the atomizing generator  4  and then is discharged into the washing machine from the air inlet  4111  when the drying module  5  of the washing machine is started, as a result, the safety of operating the washing machine is greatly improved. Moreover, such an arrangement has high feasibility and excellent effects, advantageous for mass promotion and application. 
     The atomizing generator will be described in detail with reference to  FIGS. 2 to 8 , wherein  FIG. 6  is a cross-sectional view of  FIG. 2  at C-C;  FIG. 7  is a structural view (I) of a first housing cover of the atomizing generator according to Embodiment 2 of the present invention;  FIG. 8  is a structural view (II) of the first housing cover of the atomizing generator according to Embodiment 2 of the present invention. 
     As shown in  FIGS. 2, 3 and 5 , in one possible embodiment, the housing  41  includes the housing body  411 , the first housing cover  412 , and the second housing cover  413 , the partition plate  417  is disposed in the housing body  411  to divide the housing body  411  into the atomizing cavity  42  and the mounting cavity  43 , the liquid inlet  4112  and the mist outlet  4113  are arranged on the bottom surface of the housing body  411  at a side corresponding to the atomizing cavity  42 , the air inlet  4111  is disposed at the position of the side surface of the housing body  411  corresponding to the mounting cavity  43 , the fan  48  is disposed in the air inlet  4111 , the partition plate  417  is provided with the notch  4171 , and the fan  48  introduces air outside the housing body  411  into the housing body  411 , with most of the air reaching the atomizing cavity  42  through the notch  4171 . The water-permeable hole (not shown) is also provided at the bottom of the housing body  411 , and the atomizing element  44  is preferably an ultrasonic atomizing film provided outside the housing body  411  and hermetically connected at the water-permeable hole by the atomizing film holder  416  for atomizing the liquid in the atomizing cavity  42  into a mist. 
     Referring to  FIGS. 7 and 8 , the first housing cover  412  is provided with the transverse rib  414  and the vertical rib  415 , the transverse rib  414  is fixedly connected to three sequentially adjacent inner side surfaces of the first housing cover  412 , and the vertical rib  415  is fixedly connected to the top surface of the first housing cover  412  and two opposite ones of the three sequentially adjacent inner side surfaces, so that the transverse rib  414 , the vertical rib  415  and three sequentially adjacent inner side surfaces jointly enclose the communicating cavity, and the second housing cover  413  can cover the communicating cavity. Referring to  FIGS. 3, 6 and 7 , the transverse rib  414  is provided with the first communication hole  4141  and the second communication hole  4142  corresponding to the atomizing cavity  42  and the mist outlet  4113 , the atomizing cavity  42  is connected to the communicating cavity through the first communication hole  4141 , and the mist outlet  4113  is connected to the second communication hole  4142  through the connecting pipe  46 . The wind shield  4143  extends downwards from the bottom surface of the transverse rib  414  into the atomizing cavity  42  and is arranged corresponding to the notch  4171 . 
     Referring to  FIGS. 4 and 6 , in one possible embodiment, the valve mechanism  45  includes the drive portion  451  and the sealing block  452 , the drive portion  451  is connected to the sealing block  452  and is capable of driving the sealing block  452  to slide reciprocally within the communicating cavity. In the case of a cylinder, an electric cylinder or a linear motor, the drive portion  451  has an output shaft fixedly connected to the sealing block  452  to drive the sealing block  452  to slide in the communicating cavity. The bottom surface of the sealing block  452  is capable of covering both the first communication hole  4141  and the second communication hole  4142 , and the holes may be properly sealed when covered. 
     Referring back to  FIG. 5 , the controller  47  is further provided in the mounting cavity  43  at a position facing the air inlet  4111 , the controller  47  is connected to the ultrasonic atomizing film, the drive portion  451  and the fan  48 , respectively, for controlling the start/stop of the ultrasonic atomizing film, the drive portion  451  and the fan  48 , respectively. 
     The above arrangement is advantageous in that the communicating cavity is arranged on the first housing cover while the mist outlet  4113  is arranged on the bottom surface of the housing body  411 , and the mist outlet  4113  is connected to the second communication hole  4142  through the communication pipe, hence a complete air flow passage is formed among the atomizing cavity  42 , the communicating cavity and the communication pipe, and the mist is naturally and strongly discharged in conjunction with the action of the fan  48 . The arrangement of the mist outlet  4113  on the bottom surface of the housing  41  facilitates the connection with the mist outlet pipe  7 , the mist outlet pipe  7  can be connected to the outer drum  3  without bending, which shortens a stroke of spraying the mist and improves the effect of spraying the mist. The arrangement of the sealing block  452  to cover and seal both the first communication hole  4141  and the second communication hole  4142  renders better effects in blocking and sealing the damp-heat air with the valve mechanism  45 . Additionally, the air inlet  4111  is arranged corresponding to the mounting cavity  43 , the controller  47  is arranged at the position facing the air inlet  4111 , so that the fan  48  can be used for dissipating heat from the controller  47  when the atomizing generator  4  works, which improves the service life and the stability of the controller  47 . The arrangement of the wind shield  4143  extending from the bottom surface of the transverse rib  414  corresponding to the notch  4171  enables the wind blown by the fan  48  to bypass after passing through the notch  4171 , so that the mist is better carried by the wind and gets quickly discharged, without remaining in the atomizing cavity  42  while the wind has blown over. 
     With the ultrasonic atomizing film adopted as the atomizing element  44 , the atomizing generator  4  utilizes electronic high-frequency oscillation (at a frequency of 1.7 MHz or 2.4 MHz and other frequencies beyond the auditory range, definitely harmless to human bodies and animals), as such, the molecular structure of liquid water is scattered through the high-frequency resonance of the atomizing film to generate naturally a dissipated mist, that is, the water is converted into ultramicro particles sized from 1 to 100 micrometers uniformly without heating or addition of any chemicals. Compared with atomizing by heating, the energy is saved by 90%. In addition, a large number of negative ions are released in the atomizing process, to react electrostatically with smoke, dust and the like floating in the air which are then precipitated; moreover, harmful substances such as formaldehyde, carbon monoxide, and bacteria can be effectively removed, micron-sized water molecules can be quickly adsorbed on clothes and render a better experience of clothes caring. 
     It is to be understood that the above-described preferred embodiments are merely illustrative of the principles of the present invention and are not intended to limit the scope of the present invention. Without departing from the principles of the present invention, those skilled in the art can adjust the above-described arrangement so that the present invention can be applied to more specific applications. 
     For example, in an alternative embodiment, the arrangement of the valve mechanism  45  is not single and variations on this basis can be obtained by a person skilled in the art as long as the first communication hole  4141  and/or the second communication hole  4142  are sealed thereby. For example, an ordinary motor may be selected as the drive portion  451 , and a transmission member may be added between the drive portion  451  and the sealing block  452  to enable the reciprocating sliding of the sealing block  452 . For example, the transmission member may be a ball screw or the like. For another example, the sealing block  452  may be provided to seal only one of the first communication hole  4141  and the second communication hole  4142 , and this would also be enough for the function of preventing the reflux of the damp-heat air. 
     For another example, in another alternative embodiment, instead of providing the controller  47  in the housing body  411 , a control unit of the drum washing machine may be used to control the start/stop of the drive portion  451 , the fan  48  and the ultrasonic atomizing film, without departing from the principles of the present invention. 
     For another example, in an alternative embodiment, instead of providing the fan  48  on the housing body  411 , the fan  48  may be disposed within the housing body  411  or elsewhere so long as the mist can be effectively discharged from the atomizing cavity  42 . For example, the fan  48  may also be provided on the mist outlet pipe  7  or the like. 
     For another example, in another alternative embodiment, a person skilled in the art would also be able to adjust the position of the communicating cavity, so long as the communicating cavity is such arranged that the atomizing cavity  42  is independent of the communicating cavity. For example, the communicating cavity may also be provided inside the housing body  411  instead of on the first housing cover  412 . 
     For another example, in another alternative embodiment, the position of the mist outlet  4113  is not single, and it may also be provided on a side wall of the housing body  411 , on the first housing cover  412 , on the second housing cover  413  or the like, which requires only adjustment of the positions of the second communication hole  4142  and the connecting pipe  46  accordingly. This adjustment of the position of the mist outlet  4113  does not depart from the principles of the present invention. 
     For another example, in an alternative embodiment, in addition to the ultrasonic atomizing film, apparently conventional heating elements and the like may be used as the atomizing element  44  so long as the atomizing generator element  44  is so configured and positioned to produce a mist from the water contained in the atomizing cavity  42 . 
     Surely, combinations of the alternative embodiments described above, as well as combinations of the alternative and preferred embodiments, may also be allowed to produce additional embodiments adapted to more specific applications. 
     The operation of the drum washing machine in one possible embodiment will now be described with reference to  FIGS. 1 to 8 . 
     In one possible embodiment, after the user selects the drying option on the control panel of the drum washing machine, the drying module  5  is started, and heated air is continuously fed into the outer drum  3  and the inner drum  2  for circulation. At the same time, after receiving the instruction to start the drying function, the controller  47  controls the drive portion  451  to start, and the drive portion  451  drives the sealing block  452  to slide, sealing both the first communication hole  4141  and the second communication hole  4142 , which prevents damp-heat air in the drum from flowing back to the atomizing generator  4  through the mist outlet pipe  7 . After the drying process is finished, for example, after receiving an instruction that the door of the drum washing machine is opened, the controller  47  controls the drive portion  451  to start again, and the drive portion  451  drives the sealing block  452  to slide reversely, leaving the first communication hole  4141  and the second communication hole  4142 , so that the first communication hole  4141  and the second communication hole  4142  are communicated. 
     Thus far, the technical solutions of the present invention have been described with reference to preferred embodiments shown in the accompanying drawings, but it will be readily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent alterations or substitutions to the relevant features without departing from the principles of the present invention, and such alterations or substitutions are intended to fall within the scope of the present invention.