CN218165162U - Surface cleaning system with cleaning roller capable of being dried uniformly - Google Patents

Abstract

The utility model discloses an even dry surface cleaning system of cleaning roller, including the surface cleaning machine that has the cleaning roller and the base that is used for placing the surface cleaning machine, be equipped with the wind channel on the base and locate fan, heater in the wind channel, fan drive air current carries heat that the heater produced to the cleaning roller transmission, be equipped with on the base with the corresponding air outlet of cleaning roller, the heater tiling set up in the wind channel, the clearance of heater both ends side and wind channel wall is less than the clearance of upside and/or downside wind channel wall the distance of heater and air outlet is less than on the air current route distance between heater and the fan, wherein, the temperature at heater both ends is higher than the temperature of heater central zone is so that the air-out temperature of air outlet is even. This scheme of adoption can be faster give the cleaning roller with the heat transfer that the heater produced, improves the total heat at air outlet both ends, guarantees the drying effect of cleaning roller.

Description

Surface cleaning system with cleaning roller capable of being dried uniformly

Technical Field

The utility model relates to a cleaning device technical field, concretely relates to even dry surface cleaning system of cleaning roller.

Background

With the increasing demand of people for improving living standard, surface cleaning machines such as floor washing machines and the like which can be conveniently cleaned are favored by more and more families, and users can realize wet cleaning of the household floor with little and simple participation. The vacuum motor that sets up in these burnishers can drive the impeller that breathes in and absorb the inside air of slop pail, thereby makes and hold the inside vacuum of bucket and suck subaerial sewage in the slop pail. However, the cleaning roller and the pipe structure on the path through which the dirt flows are in a wet state for a long time and are easy to breed bacteria, so that peculiar smell is easy to generate and secondary pollution is caused when the cleaning roller is used next time.

In the prior art, the surface cleaning machine is placed on a matched base, and a drying assembly is arranged on the base, so that the cleaning roller is dried. However, the position and structure of the heater are not reasonable, so that the surface of the cleaning roller is heated unevenly, and the drying effect is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that exists among the above-mentioned prior art is overcome for at least part, provides an even dry surface cleaning system of cleaning roller.

In order to achieve the above object, the utility model discloses a following technical scheme can realize:

the utility model provides an even dry surface cleaning system of cleaning roller, is including the surface cleaning machine that has the cleaning roller and the base that is used for placing the surface cleaning machine, be equipped with the wind channel on the base and locate fan, heater in the wind channel, fan drive air current carries heat that the heater produced to the cleaning roller transmission, be equipped with on the base with the corresponding air outlet of cleaning roller, the heater tiling set up in the wind channel, the clearance of heater both ends side and wind channel wall is less than the clearance of upside and/or downside wind channel wall the distance of heater and air outlet is less than on the air current route distance between heater and the fan, wherein, the temperature at heater both ends is higher than the temperature at heater central zone makes the cleaning roller is even dry.

Further, the heater includes a plurality of ceramic heating units arranged in parallel to the cleaning roller direction, wherein the curie temperatures of the ceramic heating units at both ends are higher than the curie temperature of the ceramic heating unit at the inner side.

Further, the heater includes electrode and electrically conductive piece, ceramic heating unit includes two relative electrically conductive surfaces, be equipped with electrode and electrically conductive piece on the electrically conductive surface respectively in proper order, ceramic heating unit is arranged side by side interval and the electrically conductive piece of its both sides is connected the power respectively in order to realize parallelly connected heating.

Furthermore, the heater comprises a resistance wire, the resistance wire comprises a first heating area and a second heating area, the first heating area corresponds to the central area of the heater, the second heating area corresponds to the two end areas of the heater, the first heating area and the second heater are connected in series, and the heating power of the first heating area is smaller than that of the second heating area.

Further, the outlet of the fan is substantially flush with the heater.

Further, surface cleaning machine includes fan subassembly and the soil pick-up chamber that has the soil pick-up mouth, fan subassembly and soil pick-up mouth intercommunication, the soil pick-up mouth is located the rear side of cleaning roller and towards the central zone of cleaning roller, the soil pick-up chamber certainly the soil pick-up mouth to the both ends of cleaning roller extend.

Further, the air duct comprises a first air duct between the heater and the air outlet, and a turbulent flow wall extending towards the inner side of the air duct is arranged on the first air duct.

Furthermore, a water outlet is further formed in the bottom wall of the first air duct, and the turbulence walls are arranged on the top wall corresponding to the water outlet so as to guide liquid flow entering the first air duct from the air outlet to flow down to the water outlet along the turbulence walls.

Furthermore, a water outlet is further formed in the bottom wall of the first air duct, an air guide wall inclined along the air outlet direction is arranged on the bottom wall of the first air duct, and the water outlet is formed in the back side of the air guide wall.

Further, the surface cleaning machine comprises a floor brush provided with the cleaning roller, the air outlet is located on the front side of the floor brush and faces the cleaning roller, and an air gap is formed between the cleaning roller and the base, so that at least part of the drying air flow passes through the air gap.

The beneficial effects of adopting above-mentioned technical scheme include: the heater is flatly arranged in the air channel and is arranged corresponding to the cleaning roller, so that the airflow can reach the surface of the cleaning roller through basically equal flow paths after carrying the heat released by the heater, the heat loss is reduced, and the gap between the two end sides of the heater and the air channel wall is set to be smaller than the gap between the upper side air channel wall and/or the lower side air channel wall, so that the airflow viscous effect on the two end sides of the heater is reduced, and the heat exchange area between the airflow and the heater is increased. Meanwhile, the temperatures of the two ends of the heater are set to be higher than the temperature of the central area of the heater, so that the heat at the two ends of the air outlet is improved, the problem of insufficient heat at the two ends of the air outlet can be effectively solved, and the cleaning roller is uniformly dried. In addition, the heater is arranged at one end close to the air outlet, so that the distance between the heater and the air outlet on the airflow path is smaller than the distance between the heater and the fan, the flow path of heat is shortened, the heat generated by the heater can be more quickly transferred to the cleaning roller, and the utilization rate of energy is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic cross-sectional view of a surface cleaning machine according to a first embodiment of the present invention;

FIG. 2 is a schematic view of a partial cross-sectional view of a surface cleaning system according to one embodiment;

FIG. 3 is a schematic view of a base according to an embodiment;

FIG. 4 is an enlarged view of a portion A of FIG. 2;

FIG. 5 is a schematic view of the arrangement of ceramic heating elements of different Curie temperatures in one embodiment of the first example;

FIG. 6 is a schematic view of a partial cross-sectional structure of the ceramic heater;

fig. 7 is a partial structural diagram of a base according to the second embodiment.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, back \8230;) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In the present application, unless expressly stated or limited otherwise, the terms "connected" and "secured" are to be construed broadly, and thus, for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

It should be noted that the cleaning machine of the present invention is a wet type floor washing/wiping device. In particular, the cleaning machine may be a hand-held cleaning machine with a wand and manually operated by a user, such as a hand-held floor washing machine, a hand-held floor scrubbing machine, or the like; it is also possible to have a cleaning robot with driving wheels, which can control the driving wheels to travel according to a program stored in the cleaning robot itself and control the cleaning roller to clean the floor.

The first embodiment is as follows:

referring to fig. 1 to 6, a surface cleaning machine is shown, which includes a machine body 100 and a floor brush 200, wherein the machine body 100 is hinged to the floor brush 200, the machine body 100 includes a machine shell 110, a fan assembly 120, a sewage tank 130 and a clean water tank 140, the fan assembly 120 is installed in the machine shell 110, the fan assembly 120 on the machine body 100 is formed by a high-speed motor, the sewage tank 130 is connected to the machine body 110 through a buckle, the floor brush 200 is provided with a scraping strip (not shown), a cleaning roller 210 for cleaning the ground and a water supply opening (not shown) communicated with the clean water tank 140 through a pipeline, the sewage suction opening 220 is located at the rear side of the cleaning roller 210, the scraping strip is arranged at the rear upper part of the cleaning roller 210 and is in interference fit with the cleaning roller, the lower end of the sewage tank 130 is communicated with the sewage suction opening 220 through a suction hose, and the fan assembly 120, the sewage tank 130, the suction hose and the sewage suction opening 220 are sequentially communicated. The cleaning roller 210 is in wiping contact with the ground to remove dirt on the ground and carry dirty liquid when rotating, the scraping bar scrapes off the dirty liquid on the cleaning roller 210, and the dirt suction port 220 is used for sucking away the scraped dirt and collecting the dirt in the sewage tank 130.

In addition, the present embodiment also shows a base 300 for the surface cleaning machine, the base 300 being capable of being placed on a floor surface, the surface cleaning machine being placed on the base to perform a self-cleaning procedure to wash the cleaning roller. The base 300 comprises a shell, the shell comprises a containing part 320, an air outlet 321 and an air inlet 324, the containing part 320 is provided with a cavity for placing a floor brush, a cleaning groove corresponding to the cleaning roller is further arranged in the cavity, the air outlet 321 and the cleaning roller are correspondingly arranged, specifically, the air outlet is positioned on the front side of the floor brush and faces the cleaning roller, and the air outlet is arranged along the axial direction of the cleaning roller. The base 300 further includes a fan 330, a heater 340 and an air duct, the heater is flatly disposed in the air duct, a gap between two ends of the heater and the air duct wall is smaller than a gap between the upper side and/or the lower side air duct wall, a distance between the heater and the air outlet on the air flow path is smaller than a distance between the heater and the fan, wherein temperatures at two ends of the heater are higher than a temperature in a central area of the heater, the fan 330 sucks air flow from an external environment through the air inlet 324 and drives the air flow to flow through the heater 340, so that the air flow carries heat on the heater 340 to blow toward the cleaning roller after coming out of the air outlet 321, thereby preventing bacteria from growing on the cleaning roller which has performed a self-cleaning procedure.

It will be appreciated that the fan-driven air flow is affected by viscous effects during its flow along the duct, and the flow velocity of the edge air flow is relatively slow, so that the edge air flow and the total heat released by the heater carried by the edge air flow is low relative to the central air flow and the total heat released by the heater is low, which leads to uneven drying of the cleaning roller, and this problem is particularly acute in divergent duct configurations.

In this embodiment, the heaters are flatly laid in the air duct and are arranged corresponding to the cleaning roller, so that the airflow carrying the heat released by the heaters can reach the surface of the cleaning roller through substantially equal flow paths, thereby reducing heat loss, and the gaps between the two end sides of the heaters and the air duct walls are set to be smaller than the gaps between the upper side air duct walls and/or the lower side air duct walls, thereby reducing the airflow viscous effect on the two end sides of the heaters and increasing the heat exchange area between the airflow and the heaters. Meanwhile, the temperatures of the two ends of the heater are set to be higher than the temperature of the central area of the heater, so that the heat at the two ends of the air outlet is improved, the problem of insufficient heat at the two ends of the air outlet can be effectively solved, and the cleaning roller is uniformly dried. In addition, the heater is arranged at one end close to the air outlet, so that the distance between the heater and the air outlet on the airflow path is smaller than the distance between the heater and the fan, the flow path of heat is shortened, the heat generated by the heater can be more quickly transferred to the cleaning roller, and the utilization rate of energy is improved.

Further, as shown in fig. 2 and 4, the heater 340 is disposed below the cleaning roller 210, that is, below the cleaning bath. Preferably, the heater is no longer than 30mm from the air outlet, and heat loss in the air duct is reduced.

Further, as shown in fig. 2, the outlet of the fan 330 is substantially flush with the heater 340. Specifically, the air duct includes a second air duct between the fan and the heater, the second air duct is substantially horizontally disposed, the fan and the heater are respectively disposed at two ends of the second air duct, that is, an outlet of the fan is at least overlapped with the heater in the horizontal direction. So for the air current that comes out from the export of fan can be smooth and easy pass through the second wind channel, minimize pressure loss, and then guarantee that it can better heat transfer when flowing through the heater.

Preferably, the fan is a centrifugal fan, so that the flow velocity of the air flow at the outlet is more uniform, and the air pressure is more stable.

Compared with the prior art in which the shunting ribs are arranged in the second air channel, the problem that the air pressure and the air speed are greatly reduced before the air flow flows through the heater is solved.

In one embodiment of this embodiment, as shown in fig. 5 and 6, the heater 340 includes a plurality of ceramic heating units 341, and the plurality of ceramic heating units 341 are arranged in a direction parallel to the cleaning roller, wherein the curie temperatures of the ceramic heating units at both ends are higher than the curie temperature of the ceramic heating unit at the inner side. Fig. 5 shows, by way of example, that the curie temperature of two ceramic heating elements at both ends is 185 ℃ and the curie temperature of the remaining ceramic heating elements is 110 ℃. It will be appreciated that the curie temperature of the ceramic heating elements may also be arranged to increase sequentially or in steps from the central region to the ends.

In this embodiment, through set up a plurality of ceramic heating units that are different apart from the temperature on the heater for the heater heaies up soon, and the temperature of different positions is controlled more easily moreover, can also effectively guarantee electric safety.

Further, the heater 340 includes an electrode 342 and a conductive member 343, the ceramic heating unit 341 includes two opposite conductive surfaces, the electrode 342 and the conductive member 343 are respectively and sequentially disposed on the conductive surfaces, the ceramic heating unit is arranged side by side at intervals, and the conductive members at two sides of the ceramic heating unit are respectively connected to a power supply to realize parallel heating. Specifically, the electrode member 342 and the ceramic heating unit 341 are respectively arranged at intervals corresponding to the ceramic heating unit to prevent short circuit therebetween. Preferably, the electrode member 342 is an aluminum sheet, the conductive member 343 is a stainless steel sheet, and the conductive member 343 is integrally formed by the stainless steel sheet. When the heater is produced, the two opposite conductive surfaces are respectively brushed with conductive adhesive, an aluminum sheet is adhered to the conductive surfaces and is cured for 1.5 to 2 hours by a 180-degree oven, then the surface of the other side of the aluminum sheet is coated with the conductive adhesive, and the stainless steel sheet with the thickness of 1mm is adhered to the surface of the aluminum sheet and is cured by the oven.

Therefore, the heater is convenient in processing and manufacturing process, and because each ceramic heating unit is electrically connected in parallel, the open circuit of a single ceramic heating unit cannot influence other heating elements.

Further, the heater 340 further includes a heat dissipation fin (not shown), an insulating layer (not shown) is coated outside the ceramic heating unit, and the heat dissipation fin is disposed outside the insulating layer for heat transfer. Preferably, the heat dissipation fin covers the ceramic heating unit in the insulating layer.

In another embodiment of this embodiment, the heater includes resistance wires (not shown in the drawings), the resistance wires respectively include a first heat-generating region corresponding to the central region of the heater and second heat-generating regions corresponding to the two end regions of the heater, the first heat-generating region and the second heat generator are connected in series, and the heating power of the first heat-generating region is smaller than that of the second heat-generating region. Specifically, the sectional control of one heating pipe can be realized by adjusting the material, the thickness, the width and the length of the heating wire at different power sections of the heating pipe, different powers can be selected for heating at different temperatures, and the heating efficiency and the temperature control accuracy are greatly improved.

It can be understood that the heater in this embodiment may also be an electric heating film, an electric heating tube, an electromagnetic coil heating, or other modes.

Further, the base further comprises a charging portion 310, the charging portion is arranged on the rear side of the base in a columnar shape, the charging portion 310 is provided with an electric connection unit 311, and the electric connection unit 311 is used for being electrically connected with the surface cleaning machine to charge a rechargeable battery in the surface cleaning machine. Specifically, the base still includes the adapter of being connected with outside commercial power supply, the adapter respectively with charge portion, fan, heater isoelectrical connection.

Further, the air duct includes a first air duct between the heater 323 and the air outlet 321, and a spoiler wall 326 extending toward an inner side of the air duct is disposed on the first air duct.

After the airflow path heater is heated and meets the turbulence wall in the first air channel, the airflows at the inner side and the outer side are mixed with each other, so that the heat of the airflow coming out of the air outlet is more uniform, and the cleaning roller is uniformly dried.

When the surface cleaning machine performs self-cleaning on the base, the cleaning roller may rotate to cause a portion of the cleaning solution to be thrown out by centrifugal force and enter the air duct through the air outlet, thereby threatening the normal operation of the internal electrical components. As shown in fig. 2 and 4, a drain 325 is disposed on a bottom wall of the first air duct, and the spoiler 326 is disposed on a top wall corresponding to the drain 325 to guide a liquid flow entering the first air duct from the air outlet to flow down to the drain along the spoiler, so that the cleaning liquid entering the first air duct is guided by the flow guiding wall to drop to the drain, thereby further ensuring electrical safety.

Further, an air gap is arranged between the cleaning roller and the base, namely the air gap is formed between the cleaning roller and the cleaning groove, so that at least part of the drying air flow passes through the air gap.

Because the heat that comes out from the air outlet can't be fast in the short time by the whole absorptions of cleaning roller, through setting up the air gap for the air current can be along the air gap encircles the cleaning roller and flows, thereby promotes the utilization ratio of energy, further shortens the drying time of cleaning roller.

Preferably, the range of the air gap is 1.5-5 mm. If the gap is smaller than 2.5mm, the machine leaks water to the position right below the rolling brush, the rolling brush can be continuously wetted, and drying failure is caused. If the clearance is larger than 2.5mm, the roller brush rotating at high speed and the air flow can not clean the fine sand deposited below the roller brush when the machine is self-cleaned. The air passing clearance is set to be 1.5-5 mm, so that the drying time is ensured while the self-cleaning effect is ensured.

Further, as shown in fig. 4, a perpendicular bisector C-C of the air outlet passes through the lower side of the rotation center axis 0-0 of the cleaning roller.

The perpendicular bisector C-C of the air outlet is arranged to penetrate through the lower portion of the rotation center shaft 0-0 of the cleaning roller, so that the drying air can better flow around the cleaning roller along the air passing gap.

Further, the soil suction port 220 is located at the rear side of the cleaning roller and faces the central area of the cleaning roller, that is, the soil suction port is located at the central area of the cleaning roller and faces the cleaning roller in the axial direction of the cleaning roller, and the soil suction cavity extends from the soil suction port to the two ends of the cleaning roller. Preferably, the sectional area of the sewage suction cavity is gradually reduced from the two ends of the sewage suction cavity to the sewage suction port, so that the sewage suction cavity is in a gradually reduced shape towards the sewage suction port.

By arranging the dirt suction port in the central area of the cleaning roller, the suction force of the area in the dirt suction cavity corresponding to the central area of the cleaning roller is larger, and the area is close to the dirt suction port, liquid in the area is easier to suck when the cleaning roller is self-cleaned, and partial liquid in the areas at two ends of the cleaning roller is not too much to suck. As described above, the temperatures at the two ends of the heater are set to be higher than the temperature in the central area of the heater, so that the outlet air heat at the two ends of the air outlet is higher than the outlet air heat in the central area of the air outlet, and the areas at the two ends of the cleaning roller can be intensively dried, thereby realizing uniform drying of the cleaning roller.

Example two:

as shown in fig. 7, the present embodiment is different from the first embodiment in that: the spoiler wall 326 is disposed on the bottom wall of the first air duct and inclined along the air outlet direction, an air guide wall 327 inclined and extending along the air outlet direction is disposed in the first air duct, and the water outlet 325 is disposed on the back side of the air guide wall.

Through set up the wind-guiding wall that extends along the slope of air-out direction in first wind channel, can shorten the flow path of air current, the quick flow direction air outlet of guide air current prevents that the air current from forming the sinuous flow in first wind channel, has also guaranteed simultaneously that the air current temperature of air outlet is even.

Furthermore, the air guide wall is arranged at a plurality of intervals. Specifically, as shown in fig. 7, the height of the top end of the air guide wall corresponds to the shape of the upper wall of the first air duct, so that the air flow can be discharged from the air outlet more smoothly under the action of the air guide wall.

Claims (10)

1. The utility model provides an even dry surface cleaning system of cleaning roller, includes the surface cleaning machine that has the cleaning roller and the base that is used for placing the surface cleaning machine, be equipped with the wind channel on the base and locate fan, heater in the wind channel, fan drive air current carries heat that the heater produced to the cleaning roller transmission, a serial communication port, be equipped with on the base with the corresponding air outlet of cleaning roller, the heater tiling set up in the wind channel, the clearance of heater both ends side and wind channel wall is less than the clearance of upside and/or downside wind channel wall the distance of heater and air outlet is less than in the wind channel distance between heater and the fan, wherein, the temperature at heater both ends is higher than the regional temperature of heater center makes the cleaning roller is evenly dry.

2. The surface cleaning system for uniformly drying the cleaning roller as set forth in claim 1, wherein the heater comprises a plurality of ceramic heating units arranged in a direction parallel to the cleaning roller, wherein the curie temperature of the ceramic heating units at both ends is higher than that of the ceramic heating units at the inner side.

3. The surface cleaning system for uniformly drying the cleaning roller as set forth in claim 2, wherein the heater comprises an electrode member and a conductive member, the ceramic heating unit comprises two opposite conductive surfaces, the electrode member and the conductive member are respectively disposed on the conductive surfaces in sequence, the ceramic heating unit is arranged side by side at intervals, and the conductive members on both sides of the ceramic heating unit are respectively connected to a power supply to realize parallel heating.

4. The surface cleaning system with uniform drying of the cleaning roller as recited in claim 1, wherein the heater includes resistance wires, the resistance wires respectively include a first heat generating area corresponding to a central area of the heater and a second heat generating area corresponding to two end areas of the heater, the first heat generating area is connected in series with the second heat generator, and a heating power of the first heat generating area is smaller than a heating power of the second heat generating area.

5. A surface cleaning system with uniform drying of the scrub roller as recited in claim 1 wherein an outlet of the fan is substantially flush with the heater.

6. The surface cleaning system for uniformly drying a scrub roller of claim 1, wherein the surface cleaning machine includes a fan assembly and a dirt suction chamber having a dirt suction port, the fan assembly being in communication with the dirt suction port, the dirt suction port being located at a rear side of the scrub roller and facing a central region of the scrub roller, the dirt suction chamber extending from the dirt suction port to both ends of the scrub roller.

7. The surface cleaning system for uniformly drying a cleaning roller according to any one of claims 1 to 6, wherein the air duct includes a first air duct between the heater and the air outlet, and the first air duct is provided with a spoiler wall extending to an inner side of the air duct.

8. The surface cleaning system with uniform drying by the cleaning roller as recited in claim 7, wherein a drain is further disposed on a bottom wall of the first air duct, and the spoiler is disposed on a top wall corresponding to the drain, so as to guide the liquid flow entering the first air duct from the air outlet to flow down to the drain along the spoiler.

9. The system for cleaning a surface uniformly dried by a cleaning roller as claimed in claim 7, wherein a water outlet is further provided on the bottom wall of the first air duct, an air guide wall inclined in the air outlet direction is provided on the bottom wall of the first air duct, and the water outlet is provided on the back side of the air guide wall.

10. The surface cleaning system of any one of claims 1-6, wherein the surface cleaning machine comprises a floor brush provided with the cleaning roller, the air outlet is positioned on the front side of the floor brush and faces the cleaning roller, and an air gap is arranged between the cleaning roller and the base so that at least part of the drying air flow passes through the air gap.

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