Mop module for cleaner

Abstract

The present invention relates to a mop module of a cleaner and, more specifically, to a mop module of a cleaner which wipes and cleans foreign substances from the floor, the mop module comprising: a module housing; a water tank which is arranged on the upper portion of the module housing, and stores water therein; at least one rotating cleaner which is arranged under the module housing and to which a mop can be coupled; a heater unit which heats the water supplied from the water tank; and a steam check unit which is arranged on the heater unit and in which the steam flows from the heater unit, wherein the water tank comprises a connection panel arranged on the steam check unit, so that a user instantly recognizes that steam is generated.

Description

The vacuum cleaner's mop module

[0001] The present invention relates to a mop module of a vacuum cleaner, and more particularly, to a mop module of a vacuum cleaner that discharges high-temperature water or steam onto a mop to suck up or wipe away dust or foreign substances in an area to be cleaned.

[0002] A vacuum cleaner is a device that cleans by sucking up dust or foreign substances in the area to be cleaned or wiping them away.

[0003] These vacuum cleaners can be divided into manual vacuum cleaners that perform cleaning while the user moves the vacuum cleaner, and automatic vacuum cleaners that perform cleaning while driving on their own.

[0004] Additionally, manual vacuum cleaners can be classified into canister type vacuum cleaners, upright type vacuum cleaners, handheld vacuum cleaners, and stick type vacuum cleaners, depending on the type of vacuum cleaner.

[0005] Floor cleaning methods can be broadly divided into dry and wet cleaning. Dry cleaning involves sweeping or sucking up dust, as in conventional vacuum cleaners. Wet cleaning involves wiping dust away with a mop.

[0006] Traditionally, dry vacuum cleaners were used for dry cleaning, and wet vacuum cleaners were used for wet cleaning. However, this method was inconvenient because two different types of vacuum cleaners had to be purchased to clean various types of floors. To solve the aforementioned problems, a method was studied that has a single main body, a dry cleaning module, and a wet cleaning module, such that for dry cleaning, the dry cleaning module is mounted on the main body, and for wet cleaning, the wet cleaning module (mop module) is mounted on the main body.

[0007] However, when wet cleaning, if foreign substances are stuck to the floor, the foreign substances may still remain even if you rotate the mop that has absorbed water and clean the floor.

[0008] Additionally, if microorganisms have grown on the floor, there is a limitation in that even if you rotate a mop that has absorbed water and clean the floor, it may not be possible to completely sterilize the microorganisms.

[0009] To solve this problem, one can consider a method of heating water through a heater and supplying high-temperature water or steam to the mop.

[0010] Here, the steam mop module includes a water tank that stores water, a heater that heats the water to generate steam, and a mop that receives water or steam and wipes the floor. It is preferable that each component be configured as a single assembly for easy replacement. For example, if the water tank or heater is placed on the main body, it is an unnecessary component during dry cleaning, and the weight of the water tank or heater makes cleaning difficult. Therefore, in terms of ease of cleaning, ease of module replacement, and space utilization, it is preferable that the water tank or heater be placed on the steam mop module rather than on the main body of the cleaner.

[0011] Korean Patent Publication No. KR2023-0017117A (2023.02.03) discloses a mop nozzle that heats water and emits steam onto a mop.

[0012] The above mop nozzle discharges steam to the mop through a diffuser.

[0013] At this time, the diffuser is positioned close to the mop, so the steam emitted from the diffuser can be absorbed by the mop without leaking outside the mop nozzle. This minimizes heat loss from the steam, enabling heat transfer to the mop, thereby improving cleaning performance.

[0014] However, if the steam does not leak out as described above, it may be difficult for the user to recognize whether steam has actually been discharged onto the mop.

[0015] In this case, the user may touch the mop without realizing that it has heated up, which may result in the user getting burned.

[0016] In addition, even though the steam is discharged and sufficient heat is supplied to the mop, the user may not be aware of this and control the machine to supply more steam, which may result in excessive power consumption.

[0017] Meanwhile, Korean Patent No. KR0928162B1 (2009.11.17) discloses a nozzle of a vacuum cleaner having a steam discharge path formed to confirm the generation of steam.

[0018] The above-mentioned vacuum cleaner nozzle forms an auxiliary discharge hole in the steam discharge unit that discharges steam to the mop, thereby discharging a small amount of steam to the outside. This allows the user to check whether steam is being discharged.

[0019] However, the above-mentioned vacuum cleaner nozzle has a limitation in that it directly discharges a portion of the steam discharged to the mop, thereby reducing the amount of heat supplied to the mop and lowering energy efficiency.

[0020] In addition, since the emitted steam disappears into the air immediately, there is a limitation in that the user cannot clearly recognize whether steam is generated if he or she does not directly see the scene where steam is emitted.

[0021] Meanwhile, US registered patent US 9320405B2 (April 26, 2016) discloses a cleaning device equipped with a viewing window that can check condensation of steam.

[0022] The above cleaning device is equipped with a water tank and a steam generator in the main body of the cleaner, and a widely spread mop is equipped in the foot assembly facing the surface to be cleaned.

[0023] In this case, the cleaning device can only implement a water mop function, and has the limitation of not being able to perform various cleaning functions by replacing the module.

[0024] Additionally, because the steam generator is placed far from the mop, there is a limit to the amount of heat loss that can occur as moisture heated by the steam generator flows to the foot assembly. Furthermore, the viewing window is also placed far from the steam generator, and steam does not flow into the viewing window, making it difficult to clearly determine the presence of steam. Furthermore, visibility is significantly reduced, and users are limited in their ability to clearly recognize whether steam is being generated.

[0025] In addition, there is a limit to the cleaning efficiency because steam cannot be supplied evenly to the entire mop due to limitations in the location and number of outlets discharged by the mop.

[0026] The present invention was created to improve the problems of the mop module of a conventional vacuum cleaner as described above, and its purpose is to provide a mop module of a vacuum cleaner that increases the sterilization and foreign substance removal effect by supplying high-temperature water or steam to a mop.

[0027] In addition, the purpose is to provide a mop module for a vacuum cleaner with high visibility that can notify the user of the fact that steam has been generated when steam is generated.

[0028] In addition, the purpose is to provide a mop module for a vacuum cleaner that can immediately recognize the fact that steam is generated during cleaning even if the user does not take any special action.

[0029] In addition, the purpose is to provide a mop module for a vacuum cleaner that can minimize the loss of heat supplied to the mop while informing the user of the presence or absence of steam generation.

[0030] In addition, the purpose is to provide a mop module of a vacuum cleaner that can naturally dry steam that has condensed inside the mop module.

[0031] In order to achieve the above-mentioned purpose, the mop module of the vacuum cleaner that cleans the floor by wiping away foreign substances is filled with steam from the heating unit, and the user can immediately check the generation of steam through the steam confirmation unit.

[0032] Specifically, a mop module of a vacuum cleaner according to one embodiment of the present invention is a mop module of a vacuum cleaner that cleans by wiping foreign substances on a floor, the mop module comprising: a module housing; a water tank disposed on an upper portion of the module housing and storing water therein; at least one rotating cleaning unit disposed on a lower portion of the module housing and to which a mop can be coupled; a heating unit that heats water supplied from the water tank; and a steam confirmation unit disposed on an upper portion of the heating unit and into which steam from the heating unit is introduced, wherein the water tank includes a connection panel disposed on an upper portion of the steam confirmation unit.

[0033] The above steam confirmation unit may be positioned by being inserted into an insertion hole provided in the module housing, and the connection panel may be formed of a transparent material.

[0034] The above steam confirmation unit may be characterized in that it is positioned at a predetermined distance from the connection panel.

[0035] The above steam confirmation unit may be characterized in that it is inserted and placed into an insertion hole provided in the module housing and an exposure hole provided in the connection panel.

[0036] The above steam confirmation unit may be characterized by having a sealed space into which steam from the heating unit flows.

[0037] The above water tank may be characterized by further including a first water tank and a second water tank that are provided on each side of the connecting panel and store water therein.

[0038] The above steam verification unit may include at least one steam pipe provided within the module housing and connecting the heating unit and the steam verification unit.

[0039] The above steam pipe may be characterized in that it guides steam generated in the heating unit to the steam confirmation unit and guides droplets generated by condensation of steam in the steam confirmation unit to the heating unit.

[0040] The steam confirmation unit may include a steam window coupling unit that is arranged along the left-right direction of the module housing and has the steam pipe connected to the lower portion; and a steam window that is installed on the upper portion of the steam window coupling unit and forms a sealed space between the steam window coupling unit and the steam window coupling unit; and the steam window coupling unit may be characterized in that it has at least one inclined surface formed to be inclined downward toward the steam pipe on a surface facing the steam window.

[0041] The above steam window may be characterized in that it is arranged to be inclined at a predetermined angle with respect to the bottom surface of the module housing.

[0042] The above mop module may further include a lighting unit disposed in the module housing and providing light that penetrates the steam confirmation unit.

[0043] The above steam confirmation unit may include a steam confirmation body formed to change color when steam from the heating unit flows into the body.

[0044] The above steam confirmation unit may be characterized by including a pair of steam pipes provided within the module housing and connected to the heating unit; and a hollow steam window coupling unit having both ends connected to the pair of steam pipes.

[0045] The above steam window joint may include a convex portion having a curved shape that becomes more convex as it moves away from the steam pipe.

[0046] The heating unit may be characterized in that it comprises a discharge port for discharging steam; and at least one steam discharge hole to which the steam confirmation unit is connected; and the steam discharge hole is arranged close to the discharge port.

[0047] Meanwhile, a mop module of a vacuum cleaner according to an embodiment of the present invention is a mop module of a vacuum cleaner that cleans by wiping foreign substances on a floor, the mop module comprising: a module housing; a water tank disposed on an upper portion of the module housing and storing water therein; at least one rotating cleaning unit disposed on a lower portion of the module housing and to which a mop can be coupled; a heating unit that heats water supplied from the water tank; and a steam confirmation unit disposed to be exposed to the outside from an upper portion of the heating unit and into which steam from the heating unit is introduced; wherein the heating unit may be characterized in that it recovers droplets in which steam has undergone a phase change in the steam confirmation unit.

[0048] The above steam confirmation unit may be formed of a transparent material so as to be able to confirm whether steam is flowing in from the outside.

[0049] The above steam confirmation unit may be characterized by being formed to change color when steam is introduced so as to be able to confirm whether steam is introduced from the outside.

[0050] Other specific details of the present invention are included in the detailed description and drawings.

[0051] According to the mop module of the vacuum cleaner of the present invention as described above, one or more of the following effects are provided.

[0052] According to the mop module of the vacuum cleaner according to the present invention, there is an effect of increasing the sterilization and foreign substance removal effect by supplying high-temperature water or steam to the mop through a heater.

[0053] Additionally, when steam is generated, the generated steam rises to the steam confirmation area, allowing the user to check the steam window to determine whether steam has been generated. Furthermore, the steam window allows the user to check whether steam is being generated, not only while steam is being generated, but also after steam has been generated.

[0054] In particular, when the steam window is formed of a transparent material, the steam rises to the steam confirmation section and covers the steam window, making it appear opaque, which has the effect of allowing the user to immediately recognize the fact that steam is generated.

[0055] Here, at least one light source is installed in the module housing, and the visibility of the steam confirmation section is further improved as the light source provides light that penetrates the steam window.

[0056] Additionally, if the steam window is formed of a translucent or opaque material, the color of the steam confirmation part changes as steam rises to the steam confirmation part, which has the effect of allowing the user to immediately recognize the fact that steam is generated.

[0057] In addition, the steam confirmation part is placed inside the connection panel or safety protection cover of the water tank, and in particular, since the steam confirmation part is placed away from the connection panel or safety protection cover, it has the effect of preventing safety accidents caused by user contact.

[0058] Additionally, by placing the steam window on the upper side of the module housing, it has the effect of immediately informing the user who is cleaning of the fact that steam is being generated while looking around the upper part of the mop module.

[0059] In addition, since the steam confirmation part is positioned adjacent to the steam outlet of the heating part, the user can recognize the fact that steam is generated when steam reaches the mop, and the user can immediately start steam cleaning, thereby saving electricity.

[0060] In addition, the steam introduced into the steam confirmation section is condensed and returned to the heating section, thereby preventing loss of heat supplied to the mop for the purpose of confirming the generation of steam.

[0061] Figure 1 is a perspective view of a vacuum cleaner according to one embodiment of the present invention.

[0062] FIG. 2 is a perspective view illustrating a mop module in a vacuum cleaner according to one embodiment of the present invention.

[0063] Figure 3 is an exploded perspective view of Figure 2.

[0064] FIG. 4 is a perspective view of a mop module according to one embodiment of the present invention with the upper housing removed.

[0065] Figure 5 is a bottom view of Figure 4.

[0066] Figure 6 is a plan view of Figure 4.

[0067] Fig. 7 is a perspective view for explaining a heating unit in a mop module according to one embodiment of the present invention.

[0068] Figure 8 is an exploded perspective view illustrating a heating unit in a mop module according to one embodiment of the present invention.

[0069] Figure 9 is a cross-sectional view of a mop module according to one embodiment of the present invention.

[0070] Figure 10 is an enlarged view of a portion of Figure 9.

[0071] FIG. 11 and FIG. 12 are plan views of a steam confirmation unit in a mop module according to one embodiment of the present invention with the steam window removed.

[0072] Fig. 13 is a perspective view showing the light source in Fig. 7 turned on.

[0073] Fig. 14 is a cross-sectional view showing the state in which the light source is turned on in Fig. 9.

[0074] FIG. 15 is an enlarged cross-sectional view of a mop module for explaining a state in which a steam confirmation unit is directly exposed to the outside according to one embodiment of the present invention.

[0075] Fig. 16 is a perspective view of a heating unit for explaining a steam confirmation unit according to another embodiment of the present invention.

[0076] Fig. 17 is a partial cross-sectional view of a mop module for explaining a steam confirmation unit according to another embodiment of the present invention.

[0077] Fig. 18 is a partial cross-sectional view of a mop module for explaining a state in which a safety protection cover is installed in a steam confirmation unit according to another embodiment of the present invention.

[0078] Fig. 19 is a perspective view of a heating unit for explaining a steam confirmation unit according to another embodiment of the present invention.

[0079] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0080] The present invention is susceptible to various modifications and embodiments. Specific embodiments are illustrated in the drawings and described in detail in the detailed description. This is not intended to limit the invention to specific embodiments, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention.

[0081] Hereinafter, the present invention will be described with reference to drawings for explaining a vacuum cleaner nozzle according to embodiments of the present invention.

[0082] FIG. 1 is a perspective view of a vacuum cleaner according to an embodiment of the present invention, FIG. 2 is a combined perspective view for explaining a mop module in a vacuum cleaner according to an embodiment of the present invention, FIG. 3 is an exploded perspective view of FIG. 2, FIG. 4 is a perspective view of a mop module according to an embodiment of the present invention with an upper housing removed, FIG. 5 is a bottom view of FIG. 4, FIG. 6 is a plan view of FIG. 4, FIG. 7 is a perspective view for explaining a heating unit in a mop module according to an embodiment of the present invention, FIG. 8 is an exploded perspective view for explaining a heating unit in a mop module according to an embodiment of the present invention, FIG. 9 is a cross-sectional view of a mop module according to an embodiment of the present invention, FIG. 10 is an enlarged view of a portion of FIG. 9, and FIGS. 11 and 12 are plan views for explaining a steam confirmation unit in a mop module according to an embodiment of the present invention with a steam window removed. FIG. 13 is a perspective view showing a state in which the light source is turned on in FIG. 7, FIG. 14 is a cross-sectional view showing a state in which the light source is turned on in FIG. 9, FIG. 15 is an enlarged cross-sectional view of a mop module for explaining a state in which a steam confirmation unit according to one embodiment of the present invention is directly exposed to the outside, FIG. 16 is a perspective view of a heating unit for explaining a steam confirmation unit according to another embodiment of the present invention, FIG. 17 is a partial cross-sectional view of a mop module for explaining a steam confirmation unit according to another embodiment of the present invention, FIG. 18 is a partial cross-sectional view of a mop module for explaining a state in which a safety protection cover is installed on a steam confirmation unit according to another embodiment of the present invention, and FIG. 19 is a perspective view of a heating unit for explaining a steam confirmation unit according to another embodiment of the present invention.

[0083] In this specification, “floor surface” may be understood to mean not only the floor surface of a living room or room, but also a surface to be cleaned made of various materials.

[0084] Referring to FIGS. 1 to 9, a cleaner (1) according to one embodiment of the present invention may include a cleaner body (400) having a suction motor for generating suction force, a mop module (100) connected to the cleaner body (400), sucking in air and foreign substances from a floor surface and cleaning the floor surface by wiping it, and an extension pipe (300) connecting the cleaner body (400) and the mop module (100).

[0085]

[0086] A mop module (100) according to an embodiment of the present invention may include a module housing (110) and a connecting pipe (180) movably connected to the module housing (110).

[0087] The mop module (100) of this embodiment can be used by being connected to, for example, a handheld vacuum cleaner or a canister-type vacuum cleaner.

[0088] That is, the mop module (100) can be detachably connected to the vacuum cleaner body (400) or the extension pipe (300). As the mop module (100) is connected to the vacuum cleaner body (400) or the extension pipe (300), a user can clean the floor using the mop module (100). At this time, the vacuum cleaner body (400) to which the mop module (100) is connected can separate dust in the air using a multi-cyclone method.

[0089] The mop module (100) can be operated by receiving power from the vacuum cleaner body (400). Specifically, the mop module (100) can be operated by receiving power from a battery (not shown) provided in the vacuum cleaner body (400).

[0090] Since the vacuum cleaner body (400) to which the mop module (100) is connected includes a suction motor (not shown), the suction force generated by the suction motor (not shown) can be applied to the mop module (100).

[0091] Therefore, in this embodiment, the mop module (100) can perform the role of sucking in foreign substances and air from the floor surface and guiding them to the vacuum cleaner body (400).

[0092] The connecting pipe (180) is connected to the rear central part of the module housing (110) and can guide the sucked air to the cleaner (1), but is not limited thereto.

[0093] To help understanding, the direction of this embodiment is defined as follows: the part where the connecting pipe (180) is connected in the mop module (100) can be said to be the back (rear) of the mop module (100), and the opposite side of the part where the connecting pipe (180) is connected can be said to be the front (front) of the mop module (100). In addition, the direction connecting the front and rear can be called the front-back direction.

[0094] In addition, when looking at the suction port (113) from the connecting pipe (180), the left side may be referred to as the left (left) side of the mop module (100), and the right side may be referred to as the right (right) side of the mop module (100). In addition, the direction connecting the left and right sides may be referred to as the left-right direction. The left-right direction may refer to the front-back direction and the direction perpendicular to each other on the horizontal plane.

[0095] In addition, based on the state in which the mop module (100) is placed on the floor, that is, based on the state in which the mop (150) is placed on the floor and can wipe the floor, the direction approaching the floor can be referred to as the lower side or downward, and the direction away from the floor can be referred to as the upper side or upward.

[0096] The mop module (100) may further include a rotating cleaning unit (140) that is rotatably provided on the lower side of the module housing (110). For example, the rotating cleaning unit (140) may be a rotating plate formed in a circular shape.

[0097] For example, the above-described rotary cleaning units (140) may be provided as a pair and arranged in the left-right direction. At this time, the pair of rotary cleaning units (140) may rotate independently. For example, the rotary cleaning unit (140) may include a first rotary cleaning unit (141) and a second rotary cleaning unit (142).

[0098] The rotating cleaning unit (140) can be combined with a mop (150). The mop (150) can be formed in the shape of a disk, for example. The mop (150) can include a first mop (151) and a second mop (152).

[0099] When the mop (150) is placed on the floor, the mop (150) is brought into close contact with the floor due to the load of the mop module (100), so the frictional force between the mop (150) and the floor increases.

[0100] The module housing (110) forms the outer shape of the mop module (100), and a suction port (113) for sucking air can be formed. The suction port (113) can be formed, for example, at the front end of the lower surface of the module housing (110). The suction port (113) can be formed to extend left and right from the module housing (110).

[0101] The module housing (110) may include a lower housing (111) and an upper housing (112) coupled to the upper side of the lower housing (111).

[0102] The lower housing (111) is equipped with a rotating cleaning unit (140) and can form the outer shape of a mop module (100).

[0103] The lower housing (111) may include a bottom surface to which a rotating cleaning unit (140) is coupled. At this time, the lower surface of the bottom surface is arranged to face the floor surface when the mop module (100) is placed on the floor surface, and a water supply unit (130), a heating unit (200), and a driving motor (170) may be provided on the upper surface of the bottom surface.

[0104] A suction port (113) may be formed in the lower housing (111). Specifically, a suction port (113) may be formed on the bottom surface of the lower housing (111). The suction port (113) refers to a space through which air containing dust can be introduced. With this configuration, when the suction motor (not shown) of the cleaner body (400) is operated, dust and air existing around the floor surface can be sucked into the flow path of the mop module (100) through the suction port (113).

[0105] The lower housing (111) may be provided with a board installation portion in which a printed circuit board (190) for controlling the drive motor (170) is installed. For example, the board installation portion may be formed in a hook shape extending upward from the lower housing (111).

[0106] A nozzle hole (not shown) for a diffuser (137) to pass through may be formed in the lower housing (111). Water or steam (water vapor) passing through the heating unit (200) and the diffuser (137) through the nozzle hole (not shown) may be supplied to the mop (150).

[0107] Meanwhile, although not shown, a light-emitting module may be provided in the lower housing (111) according to an embodiment. Specifically, a light-emitting module may be provided on the front of the lower housing (111).

[0108] The light-emitting module can irradiate light in front of the mop module (100) to identify foreign substances or microorganisms present in front of the mop module (100).

[0109] The light-emitting member can radiate light forward or downward. For example, the light-emitting member can be composed of a plurality of LEDs. In this case, the light radiated by the light-emitting member can be visible light, and in some embodiments, infrared (IR) or ultraviolet (UV) light. With this configuration, when the light-emitting member is in operation, not only can the presence of foreign substances or microorganisms in front of the mop module (100) be confirmed, but also the presence of foreign substances or microorganisms in front of the mop module (100) can be sterilized, thereby improving hygiene.

[0110] The upper housing (112) covers the upper side of the lower housing (111) and can form the outer shape of the mop module (100) of the present invention.

[0111] In addition, the module housing (110) may further include a flow path that communicates with the suction port (113) and guides air flowing in from the suction port (113) to the cleaner body (400).

[0112] The euro portion can be placed in the upper central portion of the lower housing (111), and the end portion can be connected to a connecting pipe (180).

[0113] Accordingly, since the suction port (113) can be extended in a roughly straight shape in the front-back direction by the arrangement of the euro portion, the length of the suction port (113) can be minimized, and thus the euro loss in the mop module (100) can be minimized.

[0114] The front part of the flow path can cover the upper side of the suction port (113). The flow path can be arranged to slope upward from the front end to the rear end. That is, the upper surface of the flow path can be inclined at a predetermined angle with respect to the bottom surface. In addition, the upper surface of the flow path can be inclined at a predetermined angle with respect to the bottom surface of the lower housing (111).

[0115] Therefore, the euro section can be formed with a lower height in the front part than in the back part.

[0116] According to this embodiment, since the front portion of the above-mentioned euro portion has a low height, there is an advantage in that the height of the front portion can be reduced among the total height of the above-mentioned mop module (100). The lower the height of the above-mentioned mop module (100), the higher the possibility of being able to clean by inserting it into a narrow space under furniture or a chair.

[0117] Meanwhile, in this embodiment, the heating unit (200) may be placed on the upper side of the euro section. With this configuration, the heating unit (200) can be stably supported while being placed at a predetermined angle with respect to the floor surface.

[0118]

[0119] A blocker (114) may be arranged on the lower surface of the lower housing (111). The blocker (114) may block moisture emitted from the mop (150) from diffusing to the suction port (113) by blocking the front space where the suction port (113) is arranged and the rear space where the mop (150) is arranged. For example, the blocker (114) may include a central portion (114a) and an extension portion (114b). At this time, a pair of extension portions (114b) may be symmetrically connected to ends on both sides of the central portion (114a). In addition, the central portion (114a) may be arranged at the rear of the suction port (113) to block moisture from flowing toward the suction port (113). In addition, the extension portion (114b) may be provided in an arc shape so as to surround the circular mop (150).

[0120] A plurality of rollers may be provided on the lower surface of the lower housing (111) for smooth movement of the mop module (100).

[0121] For example, a front roller (115) may be positioned in front of a mop (150) in the lower housing (111). The front roller (115) may include a first roller (115a) and a second roller (115b). The first roller (115a) and the second roller (115b) may be spaced apart from each other in the left-right direction.

[0122] The first roller (115a) and the second roller (115b) can each be rotatably connected to a shaft. The shaft can be fixed to the lower side of the lower housing (111) in a state where it is arranged to extend in the left and right directions.

[0123] The distance between the shaft and the front end of the lower housing (111) is longer than the minimum distance between the mop (150) and the front end of the lower housing (111).

[0124] For example, at least a portion of the rotary cleaner (140) may be positioned between the shaft of the first roller (115a) and the shaft of the second roller (115b).

[0125] According to this arrangement, the rotating cleaning unit (140) can be positioned as close as possible to the suction port (113), and the area cleaned by the rotating cleaning unit (140) among the floor surfaces where the mop module (100) is positioned is increased, so that the floor cleaning performance can be improved.

[0126] In the present embodiment, since the first roller (115a) and the second roller (115b) are coupled to the lower side of the lower housing (111), the mobility of the mop module (100) can be improved.

[0127] The lower housing (111) may further be provided with a third roller (116). Accordingly, the first roller (115a) and the second roller (115b) can support the mop module (100) at three points together with the third roller (116). At this time, the third roller (116) may be positioned at the rear of the mop (150) so as not to interfere with the mop (150).

[0128] Although not shown, a cooling air inlet may be formed in the lower housing (111) according to an embodiment. External air may be introduced into the interior of the module housing (110) through the cooling air inlet. In addition, the cooling air inlet may be formed on the front side wall of the lower housing (111). With this configuration, when the mop module (100) moves forward by a user's operation, the amount of air introduced may increase.

[0129] Although not shown, a cooling air outlet may be formed in the upper housing (112) according to an embodiment. Air inside the module housing (110) may be discharged to the outside through the cooling air outlet. In addition, the cooling air outlet may be formed on both side walls of the upper housing (112). With such a configuration, the air drawn in through the cooling air inlet may be guided to pass through the drive motor (170) while flowing to the cooling air outlet, and there is an advantage in that the drive motor (170) may be prevented from overheating.

[0130] In addition, based on the state in which the lower housing (111) is placed on the floor, the cooling air outlet can be positioned further from the ground than the cooling air inlet. With this configuration, the heated air inside the module housing (110) can rise and be effectively discharged to the cooling air outlet.

[0131]

[0132] The mop module (100) may further include a water tank (120) to supply moisture to the mop (150).

[0133] The water tank (120) can be detachably connected to the module housing (110). Specifically, the water tank (120) can be coupled to the upper side of the upper housing (112). For example, the water tank (120) can be mounted on a water tank mounting portion formed on the upper surface of the upper housing (112).

[0134] Additionally, the water tank (120) may be placed above the heating unit (200). Specifically, the water tank (120) is placed above the heating unit (200) and spaced apart from the heating unit (200). That is, the water tank (120) may be placed above the heating unit (200) with the upper housing (112) interposed therebetween.

[0135] Here, the water tank (120) may include a single-layer connecting panel (123) arranged on the upper portion of the heating unit (200), and a first water tank (121) and a second water tank (122) arranged on both sides of the connecting panel (123) and forming a space in which moisture is stored inside. Accordingly, when the connecting panel (123) is arranged on the upper portion of the heating unit (200) with the upper housing (112) interposed therebetween, and the connecting panel (123) is formed of a transparent material, the user can check the upper housing (112) from the outside. In particular, when the connecting panel (123) is formed of a transparent material, the steam checking unit (280, 290) described later can be checked from the outside of the mop module (100). In addition, the water tank (120) has a connection panel (123) that forms the exterior of the mop module (100), and a first water tank (121) and a second water tank (122) are formed at the bottom thereof and can be respectively mounted on the water tank mounting portion of the upper housing (112). However, a single-layer connection panel (123) may be arranged on at least a portion of the module housing (110) that is arranged at the top of the heating unit (200), and a steam confirmation unit (280, 290) may be arranged at the bottom of the connection panel (123).

[0136] With the water tank (120) mounted on the module housing (110), the water tank (120) can form the exterior of the mop module (100).

[0137] In fact, the entire upper wall of the water tank (120) can form the upper surface appearance of the mop module (100). Accordingly, the user can visually confirm whether the water tank (120) is mounted in the module housing (110).

[0138] The module housing (110) may further include a water tank separation button that is operated to separate the water tank (120) when the water tank (120) is mounted on the module housing (110). For example, the water tank separation button may be located at the center of the mop module (100). Therefore, there is an advantage in that a user can easily recognize the water tank separation button and operate the water tank separation button.

[0139] When the water tank (120) is mounted on the module housing (110), water in the water tank (120) can be supplied to the mop (150). Specifically, water stored in the water tank (120) can be supplied to the mop (150) through the water supply unit (130).

[0140] Specifically, a space capable of storing water is formed inside the water tank (120). The water stored in the water tank (120) can be supplied to the heating unit (200) through at least one pipe (hose). The water introduced into the heating unit (200) can be heated and, depending on the user's selection, can also be converted into steam (water vapor). The water or steam heated in the heating unit (200) can be supplied to the mop (150) through the diffuser (137). In addition, at least a portion of the steam heated in the heating unit (200) can be introduced into the steam confirmation unit (280, 290).

[0141] The water tank (120) includes a water inlet. The water inlet is a hole through which water flows into the water tank (120). For example, the water inlet may be formed on the side of the water tank (120).

[0142] The water tank (120) includes a drain. The drain is a hole through which water stored in the water tank (120) is discharged. The water discharged from the drain can flow to the heating unit (200). The drain can be formed on the lower surface of the water tank (120).

[0143] The water tank (120) includes an air hole. The air hole is a hole through which air can flow into the water tank (120). When water stored inside the water tank (120) is discharged to the outside, the pressure inside the water tank (120) decreases, and air can flow into the water tank (120) through the air hole to compensate for the decreased pressure. For example, the air hole can be formed at the top of the water tank (120).

[0144]

[0145] The mop module (100) of the present invention may include a water supply unit (130) having a path formed to supply water flowing from a water tank (120) to a mop (150).

[0146] Specifically, the water supply unit (130) may include a water tank connection unit (131) that introduces water from a water tank (120) into the module housing (110), a water inlet pipe (132) that supplies water introduced into the water tank connection unit (131) to a water pump (133), a guide pipe (134) that supplies water from the water pump (133) to a T-shaped connector, and a water supply pipe (135) that supplies water introduced into the connector to a heating unit (200).

[0147] The water tank connection (131) can operate a valve (not shown) inside the water tank (120) and allow water to flow.

[0148] The water tank connection (131) can be connected to the lower side of the upper housing (112), and a portion of it can protrude upwards through the upper housing (112).

[0149] The water tank connection part (131) protruding upward can be introduced into the water tank (120) by penetrating the outlet of the water tank (120) when the water tank (120) is installed in the upper housing (112).

[0150] The upper housing (112) may be provided with a sealer to prevent water discharged from the water tank (120) from leaking around the water tank connection portion (131). For example, the sealer may be formed of a rubber material and may be coupled to the upper housing (112) on the upper side of the upper housing (112).

[0151] A water pump (133) may be installed in the upper housing (112) to control the discharge of water from the water tank (120).

[0152] A water pump (133) can provide water flow. The water pump (133) may include a first connection port to which a water inlet pipe (132) is connected, and a second connection port to which a guide pipe (134) is connected. At this time, with respect to the water pump (133), the first connection port may be an inlet, and the second connection port may be an outlet.

[0153] The water pump (133) is a pump that operates to connect the first connection port and the second connection port by expanding or contracting as the internal valve body operates, and can be implemented by a known structure, so a detailed description thereof will be omitted.

[0154] A water supply pipe (135) can connect the connector and the water inlet (212) of the heating unit (200). For example, the water supply pipe (135) can be a pair of pipes branching from the connector.

[0155] Accordingly, the water supplied to the water inlet pipe (132) flows into the water pump (133) and then flows into the guide pipe (134). The water flowing into the guide pipe (134) flows into the water supply pipe (135) by the connector. Then, the water flowing into the water supply pipe (135) is supplied to the heating unit (200).

[0156]

[0157] The heating unit (200) is a device that heats water. The heating unit (200) is placed inside the module housing (110). Specifically, the heating unit (200) is installed on the upper surface of the lower housing (111).

[0158] Meanwhile, in the present invention, the heating unit (200) is arranged at an angle. Specifically, with the module housing (110) placed on the floor, the bottom surface of the heating unit (200) may be arranged to form a predetermined angle with the floor surface. That is, the height from the floor surface to the water inlet of the heating unit (200) may be higher than the height from the floor surface to the discharge port (200a) of the heating unit (200).

[0159] The heating unit (200) can heat water to generate high-temperature water or steam (water vapor). The heating unit (200) can heat water supplied from a water tank (120) and supply it to a mop (150). Specifically, the heating unit (200) can have an inlet connected to the water tank (120) and has at least one discharge port (200a) as an outlet, and the discharge port (200a) is coupled to a diffuser (137) to be described later. For example, the heating unit (200) can have a pair of discharge ports (200a), each of which can be coupled to a connecting pipe of a pair of diffusers (137). The discharge port (200a) of the heating unit (200) is located vertically above the steam discharge port of the diffuser (137) to provide the shortest movement path for the steam. And, the steam outlet of the diffuser (137) can be placed facing the mop (150).

[0160] The heating unit (200) is provided in the mop module (100) rather than in the vacuum cleaner body (400). This is to prevent cleaning from becoming inconvenient due to the weight and volume of the heating unit during dry cleaning when the heating unit is placed in the vacuum cleaner body.

[0161] The heating unit (200) can be coupled to the upper part (upper surface of the bottom) of the lower housing (111). For example, the heating unit (200) can be coupled to the upper surface of the flow path part. In this case, since the flow path part is coupled to the central part of the upper surface of the lower housing (111), the heating unit (200) can also be positioned in the central part of the lower housing (111). With this configuration, when the heating unit (200) is operated, a specific location may not be overheated by the heat supplied from the heating unit (200), thereby preventing damage to the mop module (100). In addition, the overall volume of the mop module (100) can be minimized.

[0162] The heating unit (200) may include a heating chamber (210), a heater (220), a lower cover (230), a sealer (240), an upper cover (250), a lower insulator (260), an upper insulator (270), an overheating circuit breaker (201), and a temperature detection unit (202).

[0163] At this time, a heater (220) is placed on the lower side of the heating chamber (210), a lower insulator (260) is placed on the lower side of the heater (220), and a lower cover (230) is placed on the lower side of the lower insulator (260) to cover the lower side of the heating unit (200). In addition, a sealer (240) is placed on the upper side of the heating chamber (210), an upper insulator (270) is placed on the upper side of the sealer (240), and an upper cover (250) is placed on the upper side of the upper insulator (270) to cover the upper side of the heating unit (200). Meanwhile, an overheating circuit breaker (201) and a temperature detection unit (202) are placed on the outer surface of the heating chamber (210).

[0164] The heating chamber (210) can provide a space in which a path through which moisture flows is formed inside, and in which moisture flowing through the path is heated by receiving heat generated from the heater (220).

[0165] At this time, the height from the floor surface to the water inlet of the heating chamber (210) may be higher than the height from the floor surface to the discharge port (200a) of the heating chamber (210).

[0166] With this configuration, water introduced into the water inlet of the heating chamber (210) can be heated and moved upwardly by convection, but can also be heated by flowing from the top to the bottom within the heating chamber (210) by gravity.

[0167] Moreover, even if the water heated inside the heating chamber (210) changes into steam and rises, it is not discharged to the upper part of the heating chamber (210) but remains inside the heating chamber (210) and can be additionally heated. At least a portion of the steam that has changed into a phase in the heating chamber (210) can flow into the steam confirmation unit (280, 290), and the steam that flows into the steam confirmation unit (280, 290) can condense and change into a phase into a liquid droplet and then be returned to the heating chamber (210) by gravity.

[0168] In addition, the drain generated inside the heating unit (200) is not discharged to the outside and can be continuously heated.

[0169] The heater (220) can generate heat. The heater (220) is a device that can convert electrical energy into thermal energy, and can be implemented using a known structure, so a detailed description thereof will be omitted.

[0170] The heater (220) is positioned at the lower side of the heating chamber (210) and can supply heat to the heating chamber (210). Specifically, the heater (220) can be in contact with the bottom surface of the heating chamber (210). Therefore, when heat is generated in the heater (220), the heating chamber (210) in contact with the heater (220) can be heated by conduction. Accordingly, the heater (220) can receive power from a battery (not shown) provided in the cleaner body (400) and heat water flowing inside the heating chamber (210).

[0171] Meanwhile, the heater (220) can control the temperature of the water according to the user's input. In addition, the heater (220) can change the phase of the water into steam (water vapor) according to the user's input.

[0172] Meanwhile, depending on the embodiment, a plurality of heaters (220) may be provided. For example, the heaters (220) may be respectively positioned along the left and right directions of the mop module (100). In another example, the heaters (220) may be respectively positioned along the front and rear directions of the mop module (100).

[0173] The lower cover (230) is placed on the lower side of the heater (220) and the lower insulator (260), and can cover the heater (220) and the lower insulator (260). For example, the lower cover (230) may be formed in a flat shape, but may be formed in a shape that can surround the heater (220) and the lower insulator (260). The lower cover (230) may be formed of a material that can block heat generated from the heater (220).

[0174] With this configuration, energy efficiency can be improved by preventing heat generated from the heater (220) from escaping to the outside of the heating unit (200). In addition, damage to components housed inside the module housing (110) due to heat generated from the heater (220) can be prevented.

[0175] The sealer (240) is positioned on the upper side of the heating chamber (210) and can seal the upper side of the heating chamber (210). Specifically, the sealer (240) can seal the open upper part of the chamber body (211). The sealer (240) can be formed of a material capable of blocking the passage of moisture. With this configuration, even if water vapor generated inside the heating chamber (210) rises, it can be blocked by the sealer (240) and prevented from leaking to the outside.

[0176] The upper cover (250) is positioned on the upper side of the sealer (240) and the upper insulator (270), and can cover the sealer (240) and the upper insulator (270). For example, the upper cover (250) may be formed in a flat shape, but may be formed in a shape that can wrap the sealer (240) and the upper insulator (270). The upper cover (250) may be formed of a material that can block heat transmitted through the sealer (240).

[0177] With this configuration, energy efficiency can be improved by preventing heat generated from the heater (220) from escaping to the outside of the heating unit (200). In addition, damage to components housed inside the module housing (110) due to heat generated from the heater (220) can be prevented.

[0178] The lower insulator (260) is placed between the heater (220) and the lower cover (230) and can block heat transferred from the heater (220). The lower insulator (260) can be formed to have a larger area than the heater (220). For example, the lower insulator (260) can be formed in a flat shape and made of a material capable of blocking heat transfer.

[0179] With this configuration, the heat generated from the heater (220) can be prevented from escaping to the outside of the heating unit (200), thereby improving energy efficiency. In addition, the heat generated from the heater (220) can be prevented from damaging components housed inside the module housing (110). In particular, in the present embodiment, the heat generated from the heater (220) is doubly blocked by the lower insulator (260) and the lower cover (230), thereby maximizing the effects of improving energy efficiency and preventing component damage.

[0180] The upper insulator (270) is positioned above the sealer (240) and can block heat transferred from the heating chamber (210). The upper insulator (270) may be formed to have a larger area than the sealer (240). For example, the upper insulator (270) may be formed in a flat shape and made of a material capable of blocking heat transfer.

[0181] With this configuration, the heat of the heating chamber (210) heated by the heater (220) can be prevented from escaping to the outside of the heating unit (200), thereby improving energy efficiency. In addition, the heat of the heating chamber (210) can be prevented from escaping to the outside of the heating unit (200) and damaging the components housed inside the module housing (110). In particular, in the present embodiment, the heat of the heating chamber (210) is doubly blocked by the upper insulator (270) and the upper cover (250), thereby maximizing the effects of improving energy efficiency and preventing component damage.

[0182] The overheat circuit breaker (201) is placed on the side of the heating chamber (210) and can cut off the power supplied to the heater (220) when the temperature of the heating chamber (210) is higher than a predetermined reference temperature (Tr).

[0183] An overheating circuit breaker (201) may be placed in the heating chamber (210). Specifically, the overheating circuit breaker (201) may be placed on the outer surface of the heating chamber (210).

[0184] The overheat circuit breaker (201) can be placed at a location where heat is concentrated in the heating chamber (210).

[0185] An overheat circuit breaker (201) may be a device that cuts off the connection of a circuit when overheating occurs. For example, the overheat circuit breaker (201) may be a thermal protector. A thermal protector may be a device that can automatically cut off the connection of a circuit when overheating occurs by using a bimetal. In addition, the overheat circuit breaker (201) may include any means for cutting off the connection of a circuit when overheating occurs.

[0186] The temperature detection unit (202) can measure the temperature of the heating unit (200).

[0187] The temperature detection unit (202) can be placed on the side of the heating chamber (210).

[0188] The temperature detection unit (202) can measure the temperature of the heating chamber (210). For example, the temperature detection unit (202) can be a thermistor.

[0189]

[0190] The diffuser (137) is configured to discharge water from the water tank (120) to the mop (150).

[0191] Specifically, the diffuser (137) includes at least one nozzle and can supply moisture discharged from the heating unit (200) to the mop (150) through the nozzle. That is, the diffuser (137) includes a diffuser connection pipe coupled to the discharge port (200a) of the heating unit (200) and includes at least one nozzle that sprays steam to the mop (150) as an outlet of the diffuser (137).

[0192] The diffuser (137) can be accommodated in a space formed inside the module housing (110), and a part of the diffuser (137) can be exposed to the outside of the module housing (110) by passing through a nozzle hole (not shown) formed in the module housing (110).

[0193] The diffusers (137) can be mounted in pairs in the module housing (110) and arranged in the left-right direction. In addition, the pair of diffusers (137) arranged in the left-right direction can be formed in a symmetrical shape (mirror image) of each other.

[0194] The diffuser (137) is connected to the heating unit (200) and can supply moisture flowing through the heating unit (200) to the mop (150).

[0195] The diffuser (137) has a diffusion path formed therein through which moisture can flow, and includes a nozzle through which moisture flowing through the diffusion path is discharged as a mop.

[0196] A steam outlet is formed in the nozzle of the diffuser (137). Moisture sprayed from the steam outlet is supplied to the mop (150). The mop (150) rotates while absorbing the moisture supplied through the diffuser (137) and cleans the floor.

[0197]

[0198] The rotating cleaning unit (140) can rotate by receiving power from the driving motor (170). For example, the rotating cleaning unit (140) may be a rotating plate. The rotating cleaning unit (140) may be formed in a circular shape or an annular shape with spokes, and a mop (150) may be attached to the lower surface.

[0199] At this time, the rotating cleaning unit (140) may be placed parallel to the floor surface while the mop module (100) is placed on the floor surface. Alternatively, the circular rotating cleaning unit (140) may be placed parallel to the bottom surface of the lower housing (111).

[0200] The rotary cleaner (140) may be positioned, for example, at the rear of the suction port (113) on the lower side of the module housing (110).

[0201] Therefore, when moving the mop module (100) forward to clean, foreign substances and air on the floor surface are sucked in by the suction port (113), and then the floor surface can be wiped by the mop (150).

[0202] At least one rotary cleaning unit (140) may be provided on the lower side of the module housing (110). For example, the rotary cleaning unit (140) may include a first rotary cleaning unit (141) connected to a first driving motor (171) and having a first mop (151) attached thereto, and a second rotary cleaning unit (142) connected to a second driving motor (172) and having a second mop (152) attached thereto.

[0203] Specifically, the rotary cleaner (140) may include an outer body in the shape of a circular ring, an inner body positioned in the central region of the outer body and spaced apart from the inner surface of the outer body, and a plurality of connecting ribs connecting the outer surface of the inner body and the inner surface of the outer body.

[0204] Meanwhile, the rotating cleaning unit (140) may include an attachment means for attaching a mop (150). For example, the attachment means may be Velcro.

[0205] The rotating cleaning unit (140) can be placed on the lower side of the lower housing (111). That is, the rotating cleaning unit (140) can be placed on the outside of the module housing (110).

[0206] Additionally, the rotary cleaner (140) may be connected to a driving motor (170) to receive power. For example, the rotary cleaner (140) may be connected to the driving motor (170) through at least one gear and may be rotated by the operation of the driving motor (170).

[0207] The rotating cleaning unit (140) may include a first rotating cleaning unit (141) and a second rotating cleaning unit (142). For example, when the mop module (100) is placed on the floor, the first rotating cleaning unit (141) may refer to the rotating cleaning unit (140) positioned on the left side, and the second rotating cleaning unit (142) may refer to the rotating cleaning unit (140) positioned on the right side, but is not limited thereto, and the left and right may be switched.

[0208] In this embodiment, the rotation center of the first rotating cleaner (141) and the rotation center of the second rotating cleaner (142) are spaced apart in the left-right direction.

[0209] The center of rotation of the rotary cleaner (140) may be located further from the front end of the module housing (110) than the central axis that bisects the front and rear lengths of the module housing (110). This is to prevent the rotary cleaner (140) from blocking the suction port (113).

[0210] The distance between the rotation center of the first rotating cleaning unit (141) and the rotation center of the second rotating cleaning unit (142) can be formed to be larger than the diameter of the mop (150). This is to reduce mutual friction due to interference between the first mop (151) and the second mop (152) during rotation, and to prevent the cleanable area from being reduced by the amount of interference.

[0211]

[0212] The mop (150) can clean the floor surface by rotating motion.

[0213] The mop (150) can be attached to the lower side of the rotating cleaning unit (140) so as to face the floor surface.

[0214] The mop (150) is formed so that the bottom surface facing the floor has a predetermined area, and the mop (150) is formed in a flat shape. The mop (150) is formed so that the horizontal width (or diameter) is sufficiently larger than the vertical height. When the mop (150) is coupled to the lower housing (111), the bottom surface of the mop (150) can be parallel to the floor surface.

[0215] The bottom surface of the mop (150) may be generally circular, and the mop (150) may be formed in an overall rotationally symmetrical shape. In addition, the mop (150) may be detachably attached to the bottom surface of the rotating cleaning unit (140), and may be coupled to the rotating cleaning unit (140) and rotate together with the rotating cleaning unit (140).

[0216] When the rotating cleaning part (140) and the mop (150) are coupled to the lower side of the module housing (110), a part of the mop (150) protrudes outward from the mop module (100), so that it can clean not only the floor surface located below the mop module (100) but also the floor surface located on the outer side of the mop module (100).

[0217] For example, the mop (150) may protrude not only to both sides of the mop module (100), but also to the rear.

[0218] The mop (150) may include a first mop (151) coupled with a first rotating cleaning unit (141) and a second mop (152) coupled with a second rotating cleaning unit (142). Accordingly, when the first rotating cleaning unit (141) rotates by receiving power from the first driving motor (171), the first mop (151) may also rotate together, and when the second rotating cleaning unit (142) rotates by receiving power from the second driving motor (172), the second mop (152) may also rotate together.

[0219]

[0220] Meanwhile, the mop module (100) may further include a drive motor (170) that provides power to rotate the mop (150) and the rotating cleaning unit (140).

[0221] Specifically, the drive motor (170) may include a first drive motor (171) that rotates the first rotary cleaner (141) and a second drive motor (172) that rotates the second rotary cleaner (142).

[0222] In this way, since the first driving motor (171) and the second driving motor (172) operate individually, there is an advantage in that even if either the first driving motor (171) or the second driving motor (172) breaks down, the rotation of the rotary cleaner (140) is possible by the other one.

[0223] Meanwhile, the first driving motor (171) and the second driving motor (172) may be arranged spaced apart from each other in the left and right direction in the module housing (110). In addition, the first driving motor (171) and the second driving motor (172) may be positioned at the rear of the suction port (113).

[0224] The drive motor (170) may be placed within the module housing (110). For example, the drive motor (170) may be mounted on the upper side of the lower housing (111) and covered by the upper housing (112). That is, the drive motor (170) may be positioned between the lower housing (111) and the upper housing (112).

[0225]

[0226] Meanwhile, the mop module (100) includes a connecting pipe (180) that is connected to the vacuum cleaner body (400) or the extension pipe (300).

[0227] The connecting pipe (180) may include a first connecting pipe connected to an end of the euro section, a second connecting pipe rotatably connected to the first connecting pipe, and a guide pipe connecting the inside of the first connecting pipe and the second connecting pipe.

[0228] The first connecting pipe is formed in a tube shape, and one axial end is connected to the end of the flow path, and the other axial end can be rotatably coupled to the second connecting pipe. At this time, the first connecting pipe is formed in a shape in which a portion of the outer circumference is cut, and the cut portion can be arranged so as to face the second connecting pipe and the upper side. With this configuration, when the mop module (100) is placed on the ground, the angle formed by the second connecting pipe and the ground can be changed according to the movement of the user's arm. In other words, the first connecting pipe and the second connecting pipe can serve as a kind of joint that can adjust the angle of the mop module (100) and the vacuum cleaner body (400).

[0229] The second connecting pipe is formed in a tube shape, and one axial end is rotatably connected to the first connecting pipe, and the other axial end is detachably connected by inserting the cleaner body (400) or the extension pipe (300).

[0230] Meanwhile, depending on the embodiment, it is possible for an auxiliary battery to be connected to the second connector.

[0231] Meanwhile, wires may be embedded in the first connecting tube and the second connecting tube, and the wires embedded in the first connecting tube and the second connecting tube may be electrically connected to each other.

[0232] Meanwhile, the guide tube may connect the internal space of the first connecting tube and the internal space of the second connecting tube. The guide tube may have a flow path formed therein so that air sucked from the mop module (100) flows to the extension tube (300) and / or the vacuum cleaner body (400). At this time, the guide tube may be deformed together with the rotation of the first connecting tube and the second connecting tube. For example, the guide tube may be formed in the shape of a corrugated tube.

[0233]

[0234] Meanwhile, the mop module (100) may include a printed circuit board (190) that controls the mop module (100). The printed circuit board (190) may be energized and may have communication lines arranged thereon.

[0235] Meanwhile, the module housing (110) may be provided with an operating unit for controlling the amount of water discharged from the water tank (120) and the phase of the moisture.

[0236]

[0237] Meanwhile, the mop module (100) according to one embodiment of the present invention further includes a steam confirmation unit (280, 290) provided on the upper side of the heating unit (200).

[0238] The steam confirmation unit (280, 290) may be positioned on the upper side of the heating unit (200). For example, the steam confirmation unit (280, 290) may be positioned at a position spaced upward from the upper surface of the heating unit (200). In addition, the steam confirmation unit (280, 290) may be positioned by being inserted into an insertion hole (112a) formed in the module housing (110). In addition, the connection panel (123) of the water tank (120) is formed of a transparent material so that the steam confirmation unit (280, 290) is positioned to be exposed to the outside and is positioned so that a user can check the steam confirmation unit (280, 290) from the outside.

[0239] An insertion hole (112a) is formed in the upper housing (112) and can be placed on the upper side of the heating unit (200). The insertion hole (112a) can be formed in a shape corresponding to the steam confirmation unit (280, 290) so that the steam confirmation unit (280, 290) can be inserted.

[0240] In addition, the steam confirmation unit (280, 290) is fed with steam from the heating unit (200). The steam confirmation unit (280, 290) has a sealed space formed inside, and steam generated from the heating unit (200) flows into the sealed space, and the steam can change phase and flow out to the heating unit (200) in the sealed space. The steam confirmation unit (280, 290) can have a sealed space formed inside so that at least a portion of the steam generated from the heating unit (200) can circulate. That is, the steam confirmation unit (280, 290) has a sealed space in which the steam from the heating unit (200) is fed in and then flows out to the heating unit (200) again without being discharged to the outside. The sealed space is formed to be in communication with the flow path of the heating chamber (210). In addition, the sealed space can expand the internal space of the heating unit (200).

[0241] To this end, the heating unit (200) may be provided with at least one steam outlet hole (241, 251) connected to the steam confirmation unit (280, 290). The steam outlet hole (241, 251) may be formed at the upper portion of the heating unit (200) and may be formed to connect the internal space of the heating unit (200) with the sealed space of the steam confirmation unit (280, 290). The steam outlet hole (241, 251) may be formed to penetrate from the flow path of the heating chamber (210) to the upper surface of the heating unit (200). Specifically, the steam outlet holes (241, 251) may include a first communication hole (241) formed in the sealer (240) and a second communication hole (251) formed in the upper cover (250), and the steam outlet holes (241, 251) may also be formed by penetrating the upper insulator (270).

[0242] These steam outlet holes (241, 251) are arranged closer to the outlet than the inlet of the heating unit (200). That is, the distance from the steam outlet holes (241, 251) to the outlet of the heating unit (200) is arranged closer than the distance from the steam outlet holes (241, 251) to the inlet of the heating unit (200). More specifically, the steam outlet holes (241, 251) are arranged close to the discharge port (200a) and may be formed vertically above the discharge port (200a). Accordingly, when heated water or steam is supplied to the mop (150), the user can immediately recognize this. For example, if the steam outlet holes (241, 251) are formed on the inlet side of the heating unit (200) and the steam confirmation unit (280, 290) is also positioned on the inlet side of the heating unit (200), steam flows into the steam confirmation unit (280, 290) before the heated water reaches the outlet (200a), so the user can start steam cleaning before the heated water is supplied to the mop (150). Accordingly, the reliability of the steam confirmation unit (280, 290) can be increased by positioning the steam outlet holes (241, 251) vertically above the outlet (200a), which is the outlet side of the heating unit (200). In addition, while the steam generated in the heating unit (200) flows into the steam confirmation unit (280, 290), the heated water passes through the diffuser (137) by gravity and is supplied to the mop (150).

[0243] The steam confirmation unit (280, 290) may be positioned at a location that can be seen by the user while holding the vacuum cleaner body (400). For example, the steam confirmation unit (280, 290) may be positioned at the center of the mop module (100) in the left-right direction, and may be positioned at the front side of the mop module (100) in the front-back direction.

[0244] With this configuration, even when the user holds the vacuum cleaner body (400) and operates it in a forward and backward direction, the steam confirmation part (280, 290) can be continuously exposed to the user's field of vision.

[0245] Specifically, even if the user pushes the mop module (100) away from the user, the upper surface of the mop module (100) is visible, so the steam confirmation part (280, 290) positioned thereon can be seen, and even if the user pulls the mop module (100) so that the mop module (100) comes right in front of the user's feet, the steam confirmation part (280, 290) positioned on the front side of the mop module (100) can be exposed to the user's view.

[0246] Therefore, according to the present invention, even if the user moves the mop module (100) during cleaning, there is an effect in which the steam confirmation part (280, 290) is continuously exposed to the user's view.

[0247] In particular, the steam confirmation unit (280, 290) is provided to be able to confirm whether steam is flowing into the steam confirmation unit (280, 290) from the outside of the mop module (100). To this end, at least a portion of the steam confirmation unit (280, 290) may be formed of a transparent material, or at least a portion may be formed to change color when steam is introduced. Alternatively, the steam confirmation unit (280, 290) may be provided to change shape or structure when steam is introduced, but is not limited thereto. In addition, the steam confirmation part (280, 290) may be covered with a transparent material connection panel (123) or safety protection cover (295) so as to be exposed to the outside of the mop module (100) and provided so that the user can check the steam confirmation part (280, 290), or may be inserted into an exposure hole (123a) of the connection panel (123) so as to be directly exposed to the outside of the mop module (100).

[0248]

[0249] First, referring to FIGS. 8 to 11, the steam confirmation unit (280) may include at least one steam pipe (281) provided within the module housing (110). The steam pipe (281) connects the heating unit (200) and the steam confirmation unit (280), and a steam hole (281a) is formed inside the steam pipe to communicate with the passage of the heating unit (200) and the sealed space of the steam confirmation unit (280). This steam pipe (281) may be arranged to be inclined at a predetermined angle with respect to the bottom surface of the module housing (110). Specifically, the steam pipe (281) may be arranged to be inclined toward the front as it goes upward, and the steam confirmation unit (280) may be provided at the upper portion.

[0250] The lower part may be provided with a fitting part (281b) formed to be inserted into the first communication hole (241) and the second communication hole (251) so as to be fixed to the heating part (200). At this time, the steam pipe (281) and the steam confirmation part (280) are made of a material that can withstand the high pressure caused by the steam generated in the heating part (200), and the steam pipe (281) may be fitted to the heating part (200) and provided as an integral part. The steam pipe (281) is formed in the shape of a hollow tube, and the fitting part (281b) may be provided so as to be stepped from the steam pipe (281) and protrude toward the heating part (200). In addition, the periphery of the first communication hole (241) of the sealer (240) may protrude and be inserted into the second communication hole (251) to support the fitting part (281b).

[0251] Additionally, the upper cover (250) may be provided with a connecting pipe joint (252) formed so that the peripheral portion of the second communication hole (251) protrudes and surrounds the steam pipe (281).

[0252] And, the steam confirmation unit (280) may include a steam window coupling unit (282) and a steam window (283). The steam confirmation unit (280) is arranged along the left-right direction of the module housing (110) and is configured by coupling the steam window coupling unit (282) and the steam window (283). At least one steam pipe (281) is connected to the lower portion of the steam window coupling unit (282), and the steam pipes (281) may be arranged at equal intervals along the left-right direction. For example, as illustrated in the drawing, two steam pipes (281) may be provided and formed at positions spaced apart from the left-right ends of the steam window coupling unit (282). The steam window coupling unit (282) is formed such that the edge protrudes upward, and the edge of the steam window (283) is inserted into the inside thereof, and the steam window (283) is coupled thereto. It is preferable that the steam window joint (282) and the steam window (283) be provided so as to be able to withstand the internal pressure of the heating unit (200), and the steam window (283) may be formed of a high-strength glass material.

[0253] Here, the steam window (283) has a joining flange (283a) formed by protruding from both sides, and the joining flange (283a) can be joined to the steam window fixing part (253) formed on the upper cover (250) of the heating unit (200). The steam window fixing part (253) is formed by protruding from the upper surface of the upper cover (250), and a fastening member can be fastened to the steam window fixing part (253) by penetrating the joining flange (283a).

[0254] This steam confirmation unit (280) is inserted and placed in the insertion hole (112a) of the upper housing (112), and the upper surface of the steam window (283) can be placed to face the connection panel (123) of the water tank (120). The steam window (283) can be placed to be inclined at a predetermined angle with the lower surface of the module housing (110). Specifically, the steam window (283) may have a top surface formed as a plane, but may be formed to be inclined downward as it goes forward. In addition, the steam window (283) is placed to be spaced apart from the connection panel (123), and the heat transferred to the connection panel (123) can be minimized. The steam window (283) can have a surface temperature of 80 to 90 degrees by transferring the heat of the steam, and is placed to be spaced apart from the connection panel (123) by a predetermined distance (a), thereby minimizing the surface temperature of the connection panel (123).

[0255] Meanwhile, although not limited, the steam window (283) may be positioned in the center of the left and right directions of the mop module (100). For example, the steam window (283) may be formed in a shape having a predetermined length along the left and right directions of the mop module (100).

[0256] Typically, a user cleans while looking at the periphery of the mop module (100). Therefore, according to one embodiment of the present invention, the mop module (100) has the effect of immediately notifying a user who is cleaning while looking at the upper periphery of the mop module (100) of the fact that steam is generated.

[0257] In addition, referring to FIG. 11, a steam recovery hole (282a) communicating with a steam hole (281a) is formed in the steam window coupling portion (282), and the steam recovery holes (282a) may be formed in the same number as the steam pipe (281). The steam window coupling portion (282) may be formed so that the surface facing the steam window (283) slopes downward toward the steam recovery hole (282a) or may be formed so as to have a downward curve. The steam window coupling portion (282) may be provided with at least one inclined surface (282b) formed so as to slope downward toward the steam pipe (281) on the surface facing the steam window (283). For example, the steam window joint (282) may be formed with two steam recovery holes (282a), and an inclined surface (282b) that slopes downward from the center toward the steam recovery holes (282a) on both sides may be formed on the surface facing the steam window (283). In addition, an inclined surface (282b) that slopes upward from the steam recovery hole (282a) toward the edge of the steam window joint (282) may be formed.

[0258] Through this, the steam pipe (281) guides the steam generated in the heating unit (200) to the steam confirmation unit (280), and guides the droplets generated by condensation of the steam in the steam confirmation unit (280) to the heating unit (200).

[0259] In addition, the steam confirmation unit (280) can allow steam to flow into the internal space through the steam recovery hole (282a) and condense in the steam window (283), and the droplets generated by the condensation of the steam flow down the inclined surface (282b) to the steam recovery hole (282a). These phase-changed droplets flow through the steam recovery hole (282a), the steam hole (281a), and the steam discharge hole (241, 251) by gravity and are recovered to the heating unit (200).

[0260] Also, referring to FIG. 12, four steam recovery holes (282a) may be formed in the steam window coupling portion (282), and a plurality of inclined surfaces (282b) that slope downward toward the steam recovery holes (282a) are formed on the surface facing the steam window (283). At this time, four steam pipes (281) are also provided, and four steam outlet holes (241, 251) are formed in the heating portion (200). In this way, a plurality of steam outlet holes (241, 251) may be formed in the steam window coupling portion (282), and a plurality of inclined surfaces (282b) may be formed around the steam outlet holes.

[0261] In addition, referring to FIGS. 13 and 14, at least one lighting unit (117) is arranged in the module housing (110), and the lighting unit (117) can provide light that passes through the steam confirmation unit (280) by having at least one light source (117a). The light source (117a) can irradiate light toward the steam confirmation unit (280) to confirm steam flowing into the steam confirmation unit (280) and enable the user to recognize the steam confirmation unit (280) more clearly. In particular, the lighting unit (117) can be operated to light up when the user presses the steam cleaning button to guide the user's gaze to the steam confirmation unit (280), and to light up for a preset period of time and then blink. At this time, the preset period of time may be a time during which heated moisture or steam can be sufficiently supplied to the mop (150). Alternatively, the lighting unit (117) may remain lit while the user performs steam cleaning.

[0262] The lighting unit (117) is installed in the lower housing (111) and is arranged parallel to the bottom surface of the lower housing (111) so as to irradiate light upward, and a steam confirmation unit (280) can be positioned above the lighting unit (117). The steam confirmation unit (280) is positioned forward of the front end of the heating unit as the steam pipe (281) is arranged at a predetermined angle with respect to the bottom surface of the lower housing (111), and the steam confirmation unit (280) can be arranged vertically above the lighting unit (117).

[0263] At this time, the steam confirmation unit (280) may be formed of a transparent material only for the steam window (283), or both the steam window joining unit (282) and the steam window (283) may be formed of a transparent material.

[0264] And, referring to FIG. 15, the steam confirmation unit (280) can be arranged to be directly exposed to the outside. The connection panel (123) can be provided with an exposure hole (123a) formed to allow the steam confirmation unit (280) to be inserted and arranged. The exposure hole (123a) can be formed in a shape corresponding to the insertion hole (112a) at a position corresponding to the insertion hole (112a). The steam confirmation unit (280) can be arranged to be inserted into the insertion hole (112a) and the exposure hole (123a), and the steam window (283) can be exposed to the outside. Through this, the user can directly view the steam window (283) and can more clearly view the steam formed on the steam window (283), thereby improving visibility.

[0265]

[0266] Meanwhile, FIGS. 16 and 17 illustrate a steam confirmation unit (290) according to another embodiment of the present invention.

[0267] Meanwhile, since the contents not specifically mentioned in this embodiment are the same as the mop module according to one embodiment of the present invention in terms of configuration and effect, they are omitted to avoid repeated description, and the description of the mop module according to one embodiment of the present invention may be referred to.

[0268] According to another embodiment of the present invention, a steam identification unit (290) may be formed so that at least a portion thereof changes color when steam is introduced. The steam identification unit (290) may include a steam identification body (292) formed so that the color thereof changes when steam from the heating unit (200) is introduced therein. At least a portion of the steam identification unit (290) may be formed of a material including a temperature-sensitive dye or the like that changes color at a specific temperature.

[0269] Specifically, the steam confirmation unit (290) may be composed of a pair of steam pipes (291) and a steam confirmation body (292) connecting them. The steam pipes (291) are connected to the heating unit (200) and are provided in the module housing (110), and may be provided as a pair. The steam pipe (291) may have a steam recovery hole (282a) formed therein, and the steam recovery hole (282a) may be formed to communicate with the first communication hole (241). The upper cover (250) may have a second communication hole (251) formed therein, into which the steam pipe (291) is inserted, and a connecting pipe coupling portion (252) formed such that the peripheral portion of the second communication hole (251) protrudes to surround the steam pipe (291).

[0270] The steam confirmation body (292) can be formed to change color when steam is introduced so that the presence or absence of steam can be confirmed from the outside. The steam confirmation body (292) can be provided in the form of a hollow pipe connecting a pair of connecting pipes. The internal space of the steam confirmation body (292) is communicated with the steam hole (291a) so that steam from the heating unit (200) can be introduced, and the steam condenses in the steam confirmation body (292) to generate droplets, and the generated droplets are returned to the heating unit (200) through the steam hole (291a).

[0271] To this end, the steam confirmation body (292) may include a convex portion (292a) that becomes more convex as it moves away from the steam pipe (291). The convex portion (292a) may be a curved pipe that becomes more convex as it moves toward the center of the steam pipe (291), and may guide condensed moisture to flow into the steam pipe (291).

[0272] This steam confirmation body (292) can be inserted and placed in an insertion hole (112a) formed in the upper housing (112). The connection panel (123) is placed on the upper side of the steam confirmation body (292) and can be formed of a transparent material. In addition, the connection panel (123) can be placed at a predetermined distance (a) from the steam confirmation body (292) to minimize heat transfer.

[0273] Also, referring to FIG. 18, the steam confirmation body (292) can be inserted and placed in the insertion hole (112a) and the exposure hole (123a). In addition, a safety protection cover (295) can be installed on the connection panel (123) to cover the exposed steam confirmation body (292). The safety protection cover (295) is formed of a transparent material and can be provided by being coupled to the periphery of the exposure hole (123a) of the connection panel (123). Through this, a user can be prevented from contacting the steam confirmation body (292), thereby preventing safety accidents. In addition, the safety protection cover (295) is installed on the connection panel (123) and protrudes outward from the water tank (120), thereby providing an effect that allows the user to recognize it more easily.

[0274] In addition, the steam confirmation body (293) may be provided in various shapes in the form of a pipe having at least one bend. For example, referring to FIG. 19, the steam confirmation body (293) is formed to bend in a direction away from each other in a pair of steam pipes (291), and then extended, and then formed to bend multiple times, and then extended again in the left-right direction between the steam pipes (291). However, the steam confirmation body (293) is provided with a convex portion (293a) so that moisture condensed inside flows to the steam pipe (291) and is recovered to the heating unit (200).

[0275]

[0276] Meanwhile, referring to FIG. 1, the vacuum cleaner (1) of the present invention may include an extension tube (300).

[0277] The extension tube (300) can be combined with the vacuum cleaner body (400) and the mop module (100).

[0278] For example, the extension pipe (300) may be formed in a long cylindrical shape. Accordingly, the internal space of the extension pipe (300) may be communicated with the internal space of the mop module (100). In addition, the extension pipe (300) may be communicated with a suction path formed in the suction part of the vacuum cleaner body (400).

[0279] When suction power is generated through a suction motor (not shown), suction power can be provided to the mop module (100) through the extension pipe (300). Accordingly, external dust and air can be introduced into the cleaner body (400) through the mop module (100) and the extension pipe (300). In addition, dust and air introduced through the mop module (100) can pass through the extension pipe (300) and then be introduced into the cleaner body (400).

[0280] Meanwhile, a wire may be built into the extension tube (300). Accordingly, the vacuum cleaner body (400) and the mop module (100) may be electrically connected through the extension tube (300).

[0281]

[0282] Meanwhile, referring to FIG. 1, the vacuum cleaner (1) of the present invention may include a vacuum cleaner body (400).

[0283] The vacuum cleaner body (400) may be configured to include a suction motor, a dust bin, and a battery. The vacuum cleaner body (400) may receive power from the battery to operate the suction motor, and may generate suction power by operating the suction motor.

[0284] A suction path is formed in the vacuum cleaner body (400) so that air and dust flowing in from the mop module (100) can flow.

[0285] In addition, the vacuum cleaner body (400) may be equipped with at least one cyclone section that separates dust sucked in by applying the principle of a dust collector that utilizes centrifugal force. Accordingly, dust can be separated as air drawn in through the suction passage flows in a spiral manner.

[0286] And the vacuum cleaner body (400) is equipped with a dust bin, which can store dust separated from the air sucked in through the cyclone flow.

[0287] And the battery can supply power to the mop module (100). At this time, the battery can supply power to the driving motor (170) of the mop module (100). And the battery can supply power to the water pump (133) of the mop module (100).

[0288] The vacuum cleaner body (400) is equipped with an input unit so that the user can set whether to supply power, the strength of air suction, the strength of the mop's rotation, the amount of water supplied, whether to heat water, and whether to supply steam.

[0289]

[0290] Although the present invention has been described in detail through specific examples, this is for the purpose of specifically explaining the present invention, and the present invention is not limited thereto, and it is clear that the present invention can be modified or improved by a person having ordinary knowledge in the relevant field within the technical spirit of the present invention.

[0291] All simple modifications or changes of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be made clear by the appended claims.

Claims

1. In the mop module of a vacuum cleaner that cleans foreign substances on the floor, module housing; A water tank placed on the upper part of the above module housing and storing water inside; At least one rotating cleaning unit disposed on the lower side of the module housing and to which a mop can be attached; A heating unit that heats the water supplied from the water tank; and It includes a steam confirmation unit which is placed on the upper side of the heating unit and into which steam from the heating unit is introduced; The above water tank, A mop module of a vacuum cleaner, characterized in that it includes a connection panel arranged on the upper side of the steam confirmation unit.

2. In paragraph 1, The above steam confirmation part, It is inserted and placed into the insertion hole provided in the above module housing, The above connection panel is, A mop module of a vacuum cleaner characterized by being formed of a transparent material.

3. In paragraph 2, The above steam confirmation part, A mop module of a vacuum cleaner characterized in that it is arranged at a predetermined distance from the above-mentioned connecting panel.

4. In paragraph 1, The above steam confirmation part, A mop module for a vacuum cleaner, characterized in that it is inserted and placed into an insertion hole provided in the module housing and an exposure hole provided in the connection panel.

5. In paragraph 1, The above steam confirmation part, A mop module for a vacuum cleaner characterized by having a sealed space into which steam from the heating unit flows.

6. In paragraph 1, The above water tank, A mop module for a vacuum cleaner, characterized in that it further includes a first water tank and a second water tank that are provided on each side of the above-mentioned connection panel and store water inside.

7. In paragraph 1, The above steam confirmation part, A mop module for a vacuum cleaner, characterized in that it comprises at least one steam pipe provided in the module housing and connecting the heating unit and the steam confirmation unit.

8. In paragraph 7, The above steam pipe, A mop module for a vacuum cleaner characterized in that the steam generated in the heating unit is guided to the steam confirmation unit, and the steam condensed in the steam confirmation unit is guided to the heating unit.

9. In paragraph 7, The above steam confirmation part, A steam window joint arranged along the left and right directions of the above module housing and having the steam pipe connected to the lower portion; and A steam window is installed on the upper part of the steam window joint and forms a sealed space between the steam window joint and the steam window joint; The above steam window joint is, A mop module for a vacuum cleaner, characterized in that it has at least one inclined surface formed to be inclined downward toward the steam pipe on a surface facing the steam window.

10. In paragraph 9, The above steam window is, A mop module for a vacuum cleaner characterized in that it is arranged at a predetermined angle with respect to the bottom surface of the module housing.

11. In paragraph 1, A mop module of a vacuum cleaner further comprising a lighting unit arranged in the module housing and providing light that penetrates the steam confirmation unit.

12. In paragraph 1, The above steam confirmation part, A mop module for a vacuum cleaner, characterized in that it includes a steam confirmation body formed to change color when steam from the heating unit flows into the interior.

13. In paragraph 1, The above steam confirmation part, A pair of steam pipes provided within the module housing and connected to the heating unit; and A mop module for a vacuum cleaner, characterized in that it includes a hollow steam window coupling part, both ends of which are connected to the pair of steam pipes.

14. In paragraph 13, The above steam window joint is, A mop module of a vacuum cleaner including a convex portion having a convex curve shape that becomes more convex the farther away it is from the steam pipe.

15. In paragraph 1, The above heating part, a discharge port for discharging steam; and At least one steam outlet hole to which the above steam confirmation unit is connected; A mop module of a vacuum cleaner, characterized in that the steam outlet hole is positioned close to the discharge port.

16. In the mop module of a vacuum cleaner that cleans foreign substances on the floor, module housing; A water tank placed on the upper part of the above module housing and storing water inside; At least one rotating cleaning unit disposed on the lower side of the module housing and to which a mop can be attached; A heating unit that heats the water supplied from the water tank; and It includes a steam confirmation part that is positioned so as to be exposed to the outside from the upper side of the heating part and into which steam from the heating part is introduced; A mop module of a vacuum cleaner, characterized in that the steam introduced into the steam confirmation unit is recovered by the heating unit.

17. In paragraph 16, The above steam confirmation part, A mop module for a vacuum cleaner characterized by being formed of a transparent material so that the inflow of steam can be confirmed from the outside.

18. In paragraph 16, The above steam confirmation part, A mop module for a vacuum cleaner characterized by being formed to change color when steam is introduced so that the presence of steam from the outside can be confirmed.

Images