CN219940518U - Sewage tank with air inlet structure and surface cleaning equipment - Google Patents

Abstract

The utility model provides a sewage tank with air inlet structure, barrel (1) including the stock solution, air inlet structure (3), insert through installing port (2) between air inlet structure (3) and the barrel (1) and connect, this air inlet structure (3) are equipped with intake pipe (4) and outlet duct (5) simultaneously, intake pipe (4) rotatable coupling has covering hood portion (8) of covering air inlet (6), shielding hood portion (8) can be opened to the one side that keeps away from air inlet (6) and form the open condition, the gas-liquid mixture that gets in through air inlet (6) is guided downwards by shielding hood portion (8), form the closed condition after shielding hood portion (8) reverse reset, air inlet structure (3) can carry shielding hood portion (8) and pass through installing port (2) business turn over from barrel (1); the sewage tank has a simple structure and is convenient to assemble and disassemble; a surface cleaning apparatus is also provided, employing the aforementioned sewage tank with an air intake structure.

Description

Sewage tank with air inlet structure and surface cleaning equipment

Technical Field

The utility model relates to the technical field of cleaning household appliances, in particular to a sewage tank with an air inlet structure and surface cleaning equipment.

Background

A surface cleaning apparatus comprises a suction device, a sewage tank and a cleaning part, wherein the vacuum suction generated by the suction device enables the cleaning part to suck a gas-liquid mixture into the sewage tank, sewage is stored in the sewage tank after being separated by the sewage tank, air is discharged to the environment by the suction device, and the sewage tank plays a role in gas-liquid separation and sewage storage. Such as floor washers, cloth cleaners, and the like.

For the floor scrubber, the sewage tank comprises a cylinder body, a cylinder cover and an air inlet structure arranged between the cylinder cover and the cylinder body, the cylinder cover is detachably connected with the cylinder body, sewage stored in the cylinder body can be poured out after the cylinder cover is opened, the common air inlet structure generally comprises an air inlet pipe and a separation cover positioned on the upper side of an air outlet of the air inlet pipe, the air inlet pipe and the cylinder body are generally integrally arranged through the impact of a gas-liquid mixture coming out of the air inlet to realize gas-liquid separation, the separation cover is fixed on the cylinder cover and is detached together with the cylinder cover, and therefore, when the cylinder cover and the cylinder body are detached from each other, the air inlet pipe and the separation cover are also separated from each other.

In the case of cloth cleaners, the sewage tank also comprises a cylinder body, but no cylinder cover is arranged, the bottom of the cylinder body is provided with a mounting opening and also serves as a sewage drain, an air inlet structure can be arranged in the cylinder body in a stretching mode through the mounting opening, and an air outlet pipe is further arranged in the air inlet structure, so that when the air inlet structure is arranged in the cylinder body in a stretching mode through the mounting opening, the air inlet pipe and the air outlet pipe in the air inlet structure are arranged in one step, and the mounting opening is also sealed, and the sewage tank of the cloth cleaner is generally not provided with a separating cover due to the design.

The inventor further researches and provides a sewage tank with an air inlet structure, which is simple in structure and convenient to assemble and disassemble, and a surface cleaning device which adopts the sewage tank with the air inlet structure.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provides the sewage tank with the air inlet structure, which has the advantages of simple structure and convenient disassembly and assembly; a surface cleaning apparatus is also provided, employing the aforementioned sewage tank with an air intake structure.

Compared with the prior art, the utility model provides a sewage tank with an air inlet structure, which comprises a cylinder body for storing liquid, wherein the cylinder body is provided with a mounting opening, the sewage tank also comprises an air inlet structure, the air inlet structure and the cylinder body are detachably connected through the mounting opening in an inserting way, the air inlet structure is simultaneously provided with an air inlet pipe and an air outlet pipe, the air inlet pipe is provided with an air outlet pipe, the air inlet pipe is rotatably connected with a shielding cover part for covering the air inlet, the shielding cover part can be opened to one side far away from the air inlet to form an open state, a gas-liquid mixture entering through the air inlet is guided downwards by the shielding cover part, and when the shielding cover part is reversely reset, the air inlet structure can carry the shielding cover part to enter and exit from the cylinder body through the mounting opening.

After adopting the structure, compared with the prior art, the utility model has the following advantages:

realize two states through setting up rotatable shielding cover portion that opens, be open condition and closed condition respectively, and after the closure that resets, the portable shielding cover portion of inlet structure is taken out from the barrel through the mounting hole together, therefore to the production assembly of shielding cover portion and when the user uses, if need the dismouting, all provide very big facility, in addition, form closed condition after the shielding cover portion is reverse reset, inlet structure portability shielding cover portion is together from the barrel business turn over through the mounting hole, make this disclosure applicable in this class of product of cloth cleaning machine, broken through shielding cover portion this structure and mainly used the current situation in the sewage case of this class of product of washing the ground machine. In a word, this disclosure simple structure, convenient dismouting.

In addition, the shielding cover part is beneficial to preventing the gas-liquid mixture from directly rushing to the inner wall of the cylinder.

As an improvement, the air inlet faces the longitudinal inner wall of the cylinder, and the shielding cover part can be opened obliquely to one side of the inner wall.

As an improvement, the inner wall is inclined outward from top to bottom.

As an improvement, the shielding cover part comprises a body and a swing arm positioned on the upper side of the body, the swing arm is rotatably connected with the upper part of the air inlet pipe, the body covers the air inlet when being reset and closed, and the body is kept open under the action of the gas-liquid mixture entering through the air inlet.

As an improvement, a positioning bulge and a positioning hole are arranged between the swing arm and the upper part of the air inlet pipe, and the body is reset to enable the positioning bulge and the positioning hole to be matched to form relative fixation.

As an improvement, a baffle plate for downwardly guiding the gas-liquid mixture is provided on the side of the shielding cover portion facing the gas inlet.

As an improvement, the guide plate comprises a left guide plate and a right guide plate which are parallel to each other, and the left guide plate and the right guide plate are also used for being sleeved and matched with the air inlet.

As an improvement, the bottom of the cylinder body is provided with a mounting opening for discharging sewage, the air inlet structure enters the cylinder body along the vertical direction, when the air inlet structure is detached through the mounting opening, the air inlet structure is separated from the mounting opening to open the mounting opening for discharging sewage, and when the air inlet structure is installed back through the mounting opening, the air inlet structure is connected with the mounting opening to close the mounting opening.

As an improvement, the air inlet structure is provided with a connecting seat, the connecting seat is sleeved with a nut, and correspondingly, a corresponding thread section is arranged at the position of the mounting opening of the cylinder body, and when the air inlet structure is inserted into the cylinder body, the connecting seat is tightly pressed and hermetically connected with the mounting opening through the connection of the nut and the thread section.

As an improvement, the air inlet structure adopts a columnar structure, and the air inlet pipe and the air outlet pipe are arranged in the columnar structure in parallel.

As an improvement, the air inlet and the air outlet are arranged back to back and face opposite to each other, and the air inlet is lower than the air outlet.

As an improvement, the side of the air inlet is an air inlet cavity of the cylinder, the side of the air outlet is an air outlet cavity of the cylinder, and the part between the air inlet cavity and the air outlet cavity is a communication cavity.

Compared with the prior art, the utility model also provides surface cleaning equipment which comprises a suction device, a sewage tank and a cleaning part, wherein the sewage tank is communicated with the cleaning part through an air inlet runner, the sewage tank is communicated with the suction device through an air outlet runner, and the sewage tank adopts the sewage tank.

After adopting the structure, compared with the prior art, the utility model has the following advantages:

under the prerequisite of simple structure, convenient dismouting, increased shielding cover portion, shielding cover portion is favorable to the separation efficiency of gas-liquid mixture to, also conveniently wash inlet structure after tearing down, shielding cover portion also can clear up simultaneously, in addition, the barrel of sewage case has reduced shielding owing to tearing down inlet structure, so also conveniently clear up the barrel. In summary, the present disclosure facilitates improving performance and ease of use of a surface cleaning apparatus.

Drawings

Fig. 1 is a partially cut-away perspective view (closed state) of a sewage tank having an air intake structure.

Fig. 2 is a partially cut-away perspective view (open state) of a sewage tank having an air intake structure.

Fig. 3 is a schematic perspective view of the air inlet structure showing the air outlet side.

Fig. 4 is a schematic perspective view of the intake structure showing the intake port side.

Fig. 5 is a perspective view of the air intake structure with the shield portion removed.

Fig. 6 is a schematic perspective view of the shield portion.

Fig. 7 is a perspective view of the air intake structure after the shield cover portion is opened.

Fig. 8 is a partially cut-away perspective view of an intake structure during disassembly and assembly.

Fig. 9 is a partially cut-away perspective view of the intake structure after installation.

Fig. 10 is a perspective view of the surface cleaning apparatus without the sewage tank installed.

Fig. 11 is a perspective view of a surface cleaning apparatus with a tank installed.

The reference numerals indicate that 1-cylinder, 2-mounting port, 3-intake structure, 4-intake pipe, 5-outlet pipe, 6-intake port, 7-outlet port, 8-shield part, 9-inner wall, 10-swing arm, 11-spindle, 12-positioning boss, 13-positioning hole, 14-deflector, 15-connecting seat, 16-nut, 17-threaded section, 18-intake cavity, 19-exhaust cavity, 20-float, 21-shaft hole, 22-guide groove, 23-cleaning part, 24-clean water tank, 25-pair interface, 26-intake pair interface, 27-exhaust pair interface, 28-intake opening, 29-exhaust opening.

Detailed Description

The following description is presented to enable one of ordinary skill in the art to make and use the utility model. The embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art. The basic principles of the utility model defined in the following description may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the utility model.

The present utility model is described in further detail below:

the present disclosure proposes a sewage tank having an air intake structure 3, which can be used for a surface cleaning apparatus requiring sewage storage, i.e., the surface cleaning apparatus having a sewage tank, for improving cleaning ability by sucking a gas-liquid mixture generated at the time of cleaning, after which the main dirt and liquid of the gas-liquid mixture are stored in a cylinder 12 of the sewage tank, and the gas is discharged in the environment, and the suction-generating structure is a suction apparatus, generally referred to as a blower, generating vacuum suction by high-speed operation of the blower.

In this example, a small-sized surface cleaning device such as a cloth cleaner is specifically exemplified, but the surface cleaning device is not limited to the technical scheme of using the cloth cleaner in the disclosure, and any surface cleaning device needing to be arranged in a sewage tank can adopt the technical scheme of the disclosure as required, such as a floor washing machine, a bath machine and the like.

The surface cleaning device disclosed by the disclosure generally refers to a household or small-sized surface cleaning device, which is also a characteristic of the technical scheme disclosed by the disclosure, and the surface cleaning device can realize smaller overall structural size and is suitable for the small-sized surface cleaning device.

As shown in fig. 1 to 9, a sewage tank with an air inlet structure 3 according to the present disclosure includes a tank body 1 for storing liquid, and the specific shape of the tank body 1 may be specifically set according to need, not limited to the shape shown in the present disclosure; the barrel 1 is equipped with the installing port 2, still include air inlet structure 3, through installing port 2 detachable plug-in connection between air inlet structure 3 and the barrel 1, this air inlet structure 3 is equipped with intake pipe 4 and outlet duct 5 simultaneously, intake pipe 4 is equipped with air inlet 6, outlet duct 5 is equipped with gas outlet 7, intake pipe 4 rotatable coupling has the shielding cover portion 8 that covers air inlet 6, shielding cover portion 8 can be opened to keeping away from air inlet 6 one side and form open condition, the gas-liquid mixture that gets in through air inlet 6 is guided down by shielding cover portion 8, form closed condition after shielding cover portion 8 reverse resets, air inlet structure 3 portability shielding cover portion 8 gets in and out from barrel 1 together through installing port 2.

In some embodiments, as shown in fig. 1 and 2, the air inlet 6 faces the longitudinal inner wall 9 of the cylinder 1, and the shielding cover 8 can be inclined to open to one side of the inner wall 9, and the inclined angle is set according to requirements. After the arrangement, on the one hand, the sewage can not directly impact the inner wall 9, on the other hand, the sewage can be guided downwards, and the gas can be easily separated to flow from one side of the air outlet 7.

In some embodiments, as shown in fig. 1 and 2, the inner wall 9 is disposed obliquely outward from top to bottom. This is advantageous on the one hand in that the shielding cover 8 has a larger opening and on the other hand the cylinder 1 can also form a larger volume.

In some embodiments, as shown in fig. 1, 2, 6 and 7, the shielding cover 8 comprises a body and a swing arm 10 positioned on the upper side of the body, the swing arm 10 is rotatably connected with the upper part of the air inlet pipe 4, the body covers the air inlet 6 when being reset and closed, and the body is kept open under the action of the gas-liquid mixture entering from the air inlet 6. Like this, swing arm 10's being provided with is favorable to arranging the body and is located air inlet 6 front side, and air inlet 6 can inwards be sunken, and when closing, the body is difficult to the protrusion at air inlet structure 3's outer peripheral face to be favorable to air inlet structure 3 diameter less, installation mouth 2 need not do too big, is favorable to passing in and out through installation mouth 2 in addition.

In some embodiments, as shown in fig. 5 and 6, a positioning protrusion 12 and a positioning hole 13 are arranged between the swing arm 10 and the upper part of the air inlet pipe 4, and the body is reset to enable the positioning protrusion 12 and the positioning hole 13 to be matched to form relative fixation. Thus, the air inlet structure 3 has better stability after being closed, and when the air inlet structure 3 needs to be taken out, the body is not easy to shake, so that the air inlet structure 3 fails to be taken out.

In this example, as shown in fig. 5 and 6, the positioning boss 12 is disposed on the swing arm 10, the positioning hole 13 is disposed on two opposite inner side walls of the air inlet 6, the swing arm 10 is further provided with a rotating shaft 11 extending inward, and correspondingly, the two inner side walls are respectively provided with a shaft hole 21.

In this example, as shown in fig. 5 and 6, the positioning projections 12 are provided in an arc shape so as to be able to be fitted into and out of the positioning holes 13 relatively easily.

In this example, as shown in fig. 5 and 6, in order to make the shielding cover 8 have a relatively stable direction, the two inner side walls are further provided with guide grooves 22, the guide grooves 22 are in a triangle with an open upper side, and the lower tip of the triangle is provided with a positioning hole 13, so that when the shielding cover 8 is reset by gravity, the positioning protrusion 12 and the positioning hole 13 are accurately matched.

In some embodiments, in order to better direct the gas-liquid mixture after impact on the shield portion 8, as shown in fig. 1, 2, 6, the side of the shield portion 8 facing the gas inlet 6 is provided with a baffle 14 for guiding the gas-liquid mixture downwards. In this example, the baffle 14 is set to be the left side, the middle part, the three baffle 14 that are parallel to each other in right side, and the baffle 14 on left side and right side is still used for cup jointing the cooperation with air inlet 6 simultaneously to make shelter from cover portion 8 have better reliability in long-term switching repeatedly, can be stable with the cooperation of air inlet 6 stable repeatedly. In addition, the three parallel deflectors 14 on the left side, the right side and the middle part also play a certain role in strengthening the shielding cover part 8, so that the shielding cover part has better impact resistance.

In some embodiments, as shown in fig. 1, 2, 8 and 9, a mounting port 2 for sewage is provided at the bottom of the cylinder 1, the air inlet structure 3 is moved in the up-down direction into and out of the cylinder 1, when the air inlet structure 3 is removed through the mounting port 2, the air inlet structure 3 is separated from the mounting port 2 to open the mounting port 2 for sewage, and when the air inlet structure 3 is returned through the mounting port 2, the air inlet structure 3 is connected with the mounting port 2 to close the mounting port 2. Thus, the structure is simple, and the use is convenient for users.

In some embodiments, as shown in fig. 1, 2 and 7, the air inlet structure 3 is provided with a connecting seat 15, the connecting seat 15 is sleeved with a nut 16, correspondingly, a corresponding threaded section 17 is arranged at the position of the mounting port 2 of the cylinder body 1, and when the air inlet structure 3 is inserted into the cylinder body 1, the connecting seat 15 is in compression sealing connection with the mounting port 2 through the connection of the nut 16 and the threaded section 17. After the design, the connection is simple and reliable. The sealing connection can be realized by arranging a sealing ring between the connecting seat 15 and the mounting port 2 and pressing.

In this example, the air inlet structure 3 adopts a columnar structure, and the air inlet pipe 4 and the air outlet pipe 5 are arranged in parallel in the columnar structure. Thus, the mounting port 2 can be designed smaller, and the air inlet structure 3 is convenient to enter and exit.

In some embodiments, as shown in fig. 1 and 2, the air inlet 6 and the air outlet 7 are disposed back-to-back and in opposite orientations, with the air inlet 6 being disposed lower than the air outlet 7. Thus, under the downward guiding effect of the shielding cover part 8, sewage is not easy to enter the air outlet 7 along with air flow, so that the back-to-back compact arrangement of the air outlet and the air outlet 7 is facilitated, and the structure is compact.

In this example, as shown in fig. 1 and 2, the side of the air inlet 6 facing the air inlet cavity 18 of the cylinder 1, the side of the air outlet 7 facing the air outlet cavity 19 of the cylinder 1, and the part between the air inlet cavity 18 and the air outlet cavity 19 is a communication cavity. The design forms a certain partition, namely, the orderly flow of the air flow is formed, which is beneficial to the better work of the sewage tank.

As shown in fig. 1 and 2, the cylinder 1 is provided with an air inlet 6 and an air outlet 7, the air outlet 7 and the air inlet 6 are both higher than the liquid storage level of the cylinder 1, and the liquid storage level cannot be displayed because no sewage exists in the cylinder 1 and is in an empty state at present, but the technical scheme of the disclosure is not affected, generally, the sewage tank is designed with the highest liquid storage level, when the highest liquid storage level is reached, the machine is stopped, for example, the float 20 is adopted to detect the approximate position of the current sewage level, when the highest liquid storage level is reached, the cover plate of the float 20 is blocked at the air outlet 7, then the fan of the suction device is blocked, and the machine is stopped by sensing the physical phenomenon that the current of the fan increases.

As shown in fig. 10 and 11, the surface cleaning apparatus according to the present disclosure includes a suction device, a sewage tank and a cleaning portion 23, wherein the sewage tank is communicated with the cleaning portion 23 through an air inlet flow path, and the sewage tank is communicated with the suction device through an air outlet flow path, such as a pipe, and the air outlet flow path is provided in a body of the surface cleaning apparatus. The arrow on the side of the intake pipe 4 in fig. 2 indicates the flow direction of the gas-liquid mixture, i.e., the gas-liquid mixture is sucked into the cylinder 1 from the side of the intake pipe 4, and the arrow on the side of the outlet pipe 5 indicates the flow direction of the gas flow, i.e., the gas is drawn out from the side of the outlet pipe 5.

In this case, for self-sufficiency and convenience in portable mobile use, the surface cleaning apparatus further includes a clean water tank 24, the clean water tank 24 supplies the cleaning liquid to the cleaning portion 23, in the supply path, the cleaning liquid ejected from the nozzle holes of the cleaning portion 23 is mixed with the cleaning liquid, so that a stronger cleaning ability is formed, and a dirty gas-liquid mixture generated at the time of cleaning is sucked by the suction port of the cleaning portion 23 and enters the cylinder 1 of the sewage tank through the air inlet flow passage, the air inlet 6, and the air inlet flow passage is mainly constituted of a longer hose pipe for use flexibility, thereby facilitating flexible movement of the cleaning portion 23 by the user.

In some embodiments, as shown in fig. 10, for convenience in installing the sewage tank, the sewage tank further includes an opposite port 25, in this case, when the sewage tank is installed on the surface cleaning device, the opposite port 25 is detachably connected with the sewage tank in an abutting mode, the opposite port 25 is respectively provided with an air inlet opposite port 26 of an air inlet runner and an air outlet opposite port 27 of an air outlet runner, and when the sewage tank is installed on the surface cleaning device, the air inlet runner is communicated with the air inlet pipe 4 through the air inlet opposite port 26, and the air outlet runner is communicated with the air outlet pipe 5 through the air outlet opposite port 27. In this example, the air inlet pipe 4 is provided with an air inlet opening 28 at the connecting seat 15, the air inlet opening 28 is in sealing butt joint with the air inlet butt joint port 26 through a sealing ring, the air outlet pipe 5 is provided with an air outlet opening 29 at the connecting seat 15, and the air outlet opening 29 is in sealing butt joint with the air outlet butt joint port 27 through a sealing ring.

In understanding the present utility model, the above-described structure may be understood together with other embodiments/drawings, if necessary, and will not be described herein.

The foregoing description is only illustrative of the present utility model and is therefore intended to cover all such modifications and changes in form, details, and materials as fall within the true spirit and scope of the utility model.

Claims (13)

1. The utility model provides a sewage case with inlet structure, barrel (1) including the stock solution, barrel (1) are equipped with installing port (2), a serial communication port, still include inlet structure (3), form closed state through inlet (8) down direction between inlet structure (3) and barrel (1) through installing port (2) detachable plug-in connection, this inlet structure (3) are equipped with intake pipe (4) and outlet duct (5) simultaneously, intake pipe (4) are equipped with air inlet (6), outlet duct (5) are equipped with gas outlet (7), intake pipe (4) rotatable coupling has cover portion (8) of air inlet (6), cover portion (8) can be opened to keeping away from air inlet (6) one side, the gas-liquid mixture that comes in through air inlet (6) forms closed state after cover portion (8) reverse reset, inlet structure (3) portable cover portion (8) are passed through inlet and outlet in barrel (1) together through installing port (2).

2. A sewage tank with an air intake structure according to claim 1, characterized in that the air intake (6) is directed towards the longitudinal inner wall (9) of the cylinder (1), and the shielding cover (8) is tiltable open towards said inner wall (9) side.

3. A sewage tank with an air intake structure according to claim 2, characterized in that the inner wall (9) is inclined outwardly from top to bottom.

4. A sewer tank with air inlet structure according to claim 2, characterized in that the shielding cover part (8) comprises a body and a swing arm (10) arranged on the upper side of the body, the swing arm (10) is rotatably connected with the upper part of the air inlet pipe (4), the air inlet (6) is covered when the body is reset to be closed, and the body is kept open under the action of the air-liquid mixture entering from the air inlet (6).

5. The sewage tank with the air inlet structure according to claim 4, wherein a positioning protrusion (12) and a positioning hole (13) are arranged between the swing arm (10) and the upper part of the air inlet pipe (4), and the body is reset to enable the positioning protrusion (12) and the positioning hole (13) to be matched to form relative fixation.

6. A sewage tank with an air intake structure according to claim 1 or 2, characterized in that the side of the shield part (8) facing the air intake (6) is provided with a deflector (14) for downwardly guiding the gas-liquid mixture.

7. The sewage tank with the air inlet structure according to claim 6, wherein the guide plate (14) comprises a left guide plate (14) and a right guide plate (14) which are parallel to each other, and the left guide plate (14) and the right guide plate (14) are also used for being sleeved and matched with the air inlet (6) at the same time.

8. The sewage tank with an air inlet structure according to claim 1 or 2, characterized in that the bottom of the tank body (1) is provided with a mounting opening (2) for sewage discharge, the air inlet structure (3) enters and exits the tank body (1) along the up-down direction, when the air inlet structure (3) is removed through the mounting opening (2), the air inlet structure (3) is separated from the mounting opening (2) to open the mounting opening (2) for sewage discharge, and when the air inlet structure (3) is installed back through the mounting opening (2), the air inlet structure (3) is connected with the mounting opening (2) to close the mounting opening (2).

9. A sewage tank with an air inlet structure according to claim 1 or 2, characterized in that the air inlet structure (3) is provided with a connecting seat (15), the connecting seat (15) is sleeved with a nut (16), correspondingly, the position of the mounting opening (2) of the cylinder (1) is provided with a corresponding threaded section (17), and when the air inlet structure (3) is inserted into the cylinder (1), the connecting seat (15) is tightly and hermetically connected with the mounting opening (2) through the connection of the nut (16) and the threaded section (17).

10. The sewage tank with the air inlet structure according to claim 1, wherein the air inlet structure (3) adopts a columnar structure, and the air inlet pipe (4) and the air outlet pipe (5) are arranged in the columnar structure in parallel.

11. A sewage tank with an air inlet structure according to claim 1 or 2 or 10, characterized in that the air inlet (6) and the air outlet (7) are arranged back-to-back and in opposite orientations, the air inlet (6) being arranged lower than the air outlet (7).

12. The sewage tank with the air inlet structure according to claim 11, wherein the air inlet (6) faces the air inlet cavity (18) of the cylinder (1), the air outlet (7) faces the air outlet cavity (19) of the cylinder (1), and a part between the air inlet cavity (18) and the air outlet cavity (19) is a communicating cavity.

13. A surface cleaning apparatus comprising a suction device, a sewage tank and a cleaning portion (23), the sewage tank being in communication with the cleaning portion (23) via an inlet flow path and the sewage tank being in communication with the suction device via an outlet flow path, characterized in that the sewage tank is a sewage tank according to any one of claims 1 to 12.