CN220069632U - Suction device and cleaning apparatus - Google Patents

Abstract

An embodiment of the present utility model provides a suction apparatus including: a blower; the fan cover is sleeved on the fan, the fan cover comprises a first opening end, and the first opening end is communicated with the air inlet to form an air inlet channel; the shell is hollow, the fan and the fan cover are arranged in the shell, an air outlet channel is formed in a gap between the shell and the fan cover, and the air outlet is communicated with the air outlet channel; the air outlet is communicated with the air outlet through the air outlet channel, an inner concave part is arranged at the air outlet, a through hole for air flow to pass through is formed in the surface of the inner concave part, and the inner concave part is concaved inwards towards the air outlet channel along the direction opposite to the air flow direction. The suction device provided by the embodiment of the utility model improves the circulation efficiency of the air inlet and the air outlet of the air, so as to enhance the suction effect of the suction device, thereby playing a better cleaning effect. The embodiment of the utility model also provides cleaning equipment.

Description

Suction device and cleaning apparatus

Technical Field

The embodiment of the utility model relates to the technical field of cleaning devices, in particular to a suction device and cleaning equipment.

Background

With the development of social economy, household cleaning gradually enters an intelligent and mechanized age, and the heavy workload of people in household cleaning is further relieved and the tiredness degree of people in household cleaning is relieved due to the appearance of cleaning equipment.

In the process of cleaning the cleaning equipment, dirt generated by cleaning needs to be sucked, in the process of sucking dirt, air flow flowing into the cleaning equipment is generated along a dirt sucking channel, and an air channel is arranged in the cleaning equipment so as to discharge the air flow entering the cleaning device. The size of the air inlet of the suction fan of the existing cleaning equipment is basically consistent with the size of the air inlet, so that the area of the air inlet is too small, the sucked air of the fan is limited, the suction force generated by the fan is reduced, and therefore, the ground stains are not cleaned up, and the product performance is reduced.

Thus, there is a need for a suction device and cleaning apparatus that enhance suction and enhance the ability to draw gas.

Disclosure of Invention

In order to achieve the above object, an embodiment of the present utility model provides a suction device and a cleaning apparatus, which can improve the suction force of a suction fan and enhance the capability of the cleaning apparatus to clean a surface to be cleaned.

In a first aspect, an embodiment of the present utility model provides a suction device, including:

the fan comprises an air inlet and an air outlet which are communicated;

the fan cover is sleeved on the fan and comprises a first opening end, and the first opening end is communicated with an air inlet of the fan to form an air inlet channel;

the fan and the fan cover are arranged in the accommodating space of the shell, an air outlet channel is formed in a gap between the shell and the fan cover, and an air outlet of the fan is communicated with the air outlet channel; and

the exhaust port is arranged on the shell and is communicated with the air outlet through the air outlet channel, an inner concave part is arranged at the exhaust port, a through hole for air flow to pass through is formed in the surface of the inner concave part, and the inner concave part is concaved inwards towards the air outlet channel along the direction opposite to the air flow direction.

Further, the housing includes a bottom surface provided with a mounting opening, the first open end of the fan housing is disposed on the mounting opening, and the first open end protrudes outward relative to the bottom surface.

Further, the cross-sectional area of the air inlet channel is gradually reduced from the first opening end of the fan cover to the air inlet of the fan.

Further, the concave part is a V-shaped first side wall and a V-shaped second side wall which are connected, and the through hole is formed in the first side wall and the second side wall.

Further, the through holes are strip-shaped through holes.

Further, the device further comprises a fixing plate which is arranged on the bottom of the shell, a second opening matched with the first opening end is formed in the fixing plate along the thickness direction, and the concave part extends from the fixing plate to the inside of the shell.

Further, the fan cover includes the portion of cup jointing and with extension that cup jointing portion an organic whole is connected, cup jointing portion cover is located the week side of fan, extension is followed the axis direction of fan is towards keeping away from the direction of fan extends, extension is kept away from fan one end forms first open end.

Further, the sleeve joint portion and the extension portion are both elastic structures, the sleeve joint portion is in sealing fit with the periphery of the fan, and the first opening end is used for being in sealing fit with the exhaust end of the sewage tank.

Further, the fixing plate is obliquely arranged relative to the axial direction of the fan.

In a second aspect, embodiments of the present utility model also provide a cleaning apparatus comprising a suction device as claimed in any one of the preceding claims.

According to the suction device provided by the embodiment of the utility model, the fan cover is sleeved on the fan, the first opening end on the fan cover is communicated with the air inlet of the fan to form the air inlet channel, the area of the first opening end is larger than that of the air inlet of the fan, the gap between the shell and the fan cover forms the air outlet channel, the air outlet of the fan is communicated with the air outlet channel, the air outlet is communicated with the air outlet of the fan through the air outlet channel, the air outlet is provided with the concave part, the surface of the concave part is provided with the through hole, the concave part faces the air outlet channel in the direction opposite to the air flow direction, the area of the first opening end on the fan cover is larger than that of the air inlet of the fan, the air inlet area of the fan is increased, the surface of the concave part is provided with the through hole, the concave part faces the air outlet channel in the direction opposite to the air flow direction, the air outlet area of the air outlet channel is increased, and the air is accelerated to be led out to the outside.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a suction device according to an embodiment of the present utility model, in which a direction of airflow is indicated by an arrow;

fig. 2 is a schematic structural view of a suction device according to an embodiment of the present utility model, in which a filtering portion of the suction device is shown;

FIG. 3 is a schematic view of a bottom perspective of the suction device of FIG. 1;

FIG. 4 is a schematic perspective view of a filter unit;

fig. 5 is a schematic structural view of a cleaning apparatus according to an embodiment of the present utility model, in which the direction of airflow is indicated by arrows.

Reference numerals illustrate:

the achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are correspondingly changed.

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

Referring to fig. 1 to 3, the embodiment of the present utility model proposes a suction apparatus 10 for generating negative pressure to make gas flow in a directional manner, and the suction apparatus 10 of the embodiment of the present utility model can increase the amount of gas sucked by a fan in a unit time, thereby enhancing the suction force of the fan and increasing the working efficiency of the fan.

Specifically, referring to fig. 1 to 3, fig. 1 is a schematic structural diagram of a suction device according to an embodiment of the present utility model, fig. 2 is another schematic structural diagram of the suction device of fig. 1, and fig. 3 is a schematic bottom perspective structural diagram of the suction device of fig. 1. The suction device 10 provided by the embodiment of the utility model comprises a fan 11, a fan cover 12, a shell 13 and an exhaust port 40, wherein the fan 11 is used for generating negative pressure to drive gas to flow directionally according to a preset direction. The fan cover 12 is sleeved on the fan 11 and is used for isolating the air in the fan 11, so that the air in the fan 11 can only flow out from the air outlet 112 of the fan 11, and a good working state of the fan 11 is ensured. The housing 13 is for accommodating the fan 11 and the fan housing 12; the exhaust port 40 guides the gas in the housing 13 to the outside.

In some embodiments of the present utility model, the blower 11 includes an air inlet 111 and an air outlet 112, which are connected to each other, and the air flow direction inside the blower 11 is from the air inlet 111 to the air outlet 112. The fan housing 12 is sleeved on the fan 11, the fan housing 12 comprises a first opening end 121, the first opening end 121 is communicated with the air inlet 111 of the fan 11 to form an air inlet channel 20, and the area of the first opening end 121 is larger than that of the air inlet 111 of the fan 11. The casing 13 is hollow, and its inside is equipped with accommodation space, and fan 11 and fan housing 12 set up in the accommodation space of casing 13, and the clearance between casing 13 and the fan housing 12 is formed with the passageway 30 that gives vent to anger, and the air outlet 112 of fan 11 is linked together with the passageway 30 that gives vent to anger. The exhaust port 40 is arranged on the shell 13 and is communicated with the air outlet 112 through the air outlet channel 30, an inner concave part 41 is arranged at the exhaust port 40, a through hole for air flow to pass through is arranged on the surface of the inner concave part 41, foreign matters can be prevented from entering the air outlet channel 30 by the inner concave part 41, the normal operation of the device is influenced, and the inner concave part 41 is concaved inwards towards the air outlet channel along the direction opposite to the air flow direction. The inner concave portion 41 enlarges the area of the gas in the gas outlet channel 30, so that the gas in the gas outlet channel 30 can be efficiently led out to the outside in the working state of the suction device 10, the gas in the fan 11 can flow more smoothly, and the working efficiency is further improved.

It should be noted that, in the embodiment of the present utility model, the negative pressure generated by the blower 11 drives the air inside and outside the housing 13 to continuously flow along a certain direction, and the flow direction of the air in the suction device 10 is that the blower 11 sucks the external air into the air inlet channel 20, the air enters the blower 11 through the air inlet 111 of the blower 11, the air in the blower 11 enters the air outlet channel 30 through the air outlet 112 of the blower 11, and finally is discharged from the air outlet 40 on the housing 13.

In some embodiments of the present utility model, the concave portion 41 is V-shaped and includes a first side wall and a second side wall connected to each other, and the through holes are formed in the first side wall and the second side wall, and the through holes provide channels for the gas in the gas outlet channel 30, so that the gas can be smoothly led out to the air outside.

Further, the through holes are long, so that the blower 11 can quickly flow a large amount of gas to the outside.

In some embodiments of the present utility model, the fan guard 12 includes a socket and an extension integrally connected to the socket. The circumference side of fan 11 is located to the cover portion cover, and cover portion and extension can keep apart the space in fan 11 and the casing 13 and the outside space for the airflow can flow according to the route of predetermineeing. The extension extends along the axial direction of the fan towards the direction far away from the fan 11, and one end of the extension far away from the fan 11 forms a first opening end.

Further, the sleeve joint portion and the extension portion are elastic structures, so that the fan 11 in operation can be damped, working noise of the fan 11 is reduced, and when equipment is collided, the fan 11 can be protected, in particular, the sleeve joint portion is in sealing fit with the periphery of the fan 11, gas inside the fan 11 can be isolated, the first opening end 121 is used for sealing fit with the exhaust end of the sewage tank 71, air flow in the sewage tank 71 can be driven by the fan 11, and the air flow enters the inside of the fan 11 from the exhaust end of the sewage tank 71 through the first opening end 121. In some embodiments of the present utility model, the fan guard 12 may be made of a silicone material.

In addition, the housing 13 of the embodiment of the present utility model includes a bottom surface 131, the bottom surface 131 is provided with a mounting opening, the first opening end 121 of the fan housing 12 is disposed on the mounting opening, so that the fan 11 can smoothly suck the gas required by the working from the outside air, the plane where the first opening end 121 is located is parallel to the bottom surface 131 and protrudes outwards relative to the bottom surface 131, and the purpose of this arrangement is to further increase the cross-sectional area of the air intake channel 20, so that the fan 11 can suck more gas in unit time through the air intake channel 20 during the working process, and under the same energy consumption, more gas is sucked, and the working efficiency is improved.

In some embodiments of the present utility model, the first opening end 121 of the fan housing 12 is located at the air inlet 111 of the fan 11, so that, in order to match the size of the joint between the first opening end 121 of the fan housing 12 and the air inlet 111 of the fan 11, the cross-sectional area of the air inlet channel 20 is gradually reduced along the air inlet direction, and the inner wall of the air inlet channel 20 is smoother, so that the working efficiency of the fan 11 is improved, and the directional flow of the air is prevented from being hindered by the inner wall.

Further, referring to fig. 2, the suction apparatus 10 according to the embodiment of the present utility model further includes a fixing plate 50 mounted on the bottom of the housing 13, over which the blower 11 and the blower cover 12 are disposed, and the blower 11 and the blower cover 12 are fixed in the accommodating space of the housing 13 together with the housing 13, the fixing plate 50 is provided with a second opening matching with the first opening end 121 in the thickness direction, and the first opening end 121 is communicated with the second opening to enable the blower 11 to smoothly suck the air into the air intake passage 20 and further into the blower 11, and the blower cover 12 extends from the fixing plate 50 toward the inside of the housing 13.

The fixing plate 50 is inclined with respect to the axial direction of the fan 11, and therefore can further contact the bottom of the housing 13, which is advantageous in fixing the fan 11 and the fan cover 12 in the housing space of the housing 13.

Referring to fig. 2 and 4, fig. 2 is another schematic structural diagram of a suction device according to an embodiment of the present utility model, and fig. 4 is a schematic perspective structural diagram of a filtering portion. The suction device 10 according to the embodiment of the present utility model further includes a filtering part 60 for filtering particulate matters such as dust, dirt, etc. The filter portion 60 is typically in the form of a HEPA module, and the filter portion 60 is disposed on the bottom surface 131 of the housing 13 and is in communication with the first open end 121. The fan 11 needs to inhale a large amount of gas in operation, so that poor operation of the fan 11 is easily caused, but the embodiment of the utility model has the advantages that the filter part 60 is arranged on the air inlet channel 20, so that external particulate matters can be effectively prevented from entering the interior of the fan 11, the fan 11 is prevented from being influenced by the particulate matters in operation, and dust cannot be accumulated in the clean fan 11.

In some embodiments of the present utility model, in order to enable the blower 11 to inhale more air in a unit time, the plane where the first opening end 121 is located is disposed at an angle with the horizontal plane, and the area of the bottom surface of the first opening end 121 will be enlarged, from the position of the first opening end 121 of the blower housing 12 to the position of the air inlet 111 of the blower 11, the cross-sectional area of the air inlet channel 20 is gradually reduced, and the inner wall of the air inlet channel 20 is smooth, so that the power loss of air in the air inlet channel 20 is reduced, and the air inlet efficiency of air is improved.

In addition, the suction device 10 according to the embodiment of the present utility model further includes a receiving cavity 113, where the receiving cavity 113 is disposed between the air inlet 111 and the air outlet 112 of the blower 11, and serves as a receiving space for air inside the blower 11, and specifically, the receiving cavity 113 communicates with the air inlet channel 20 and the air outlet channel 30 and is located between the air inlet channel 20 and the air outlet channel 30. Further, referring to fig. 2, the housing 13 includes a first housing 132 and a second housing 133, and an accommodating space for accommodating the blower 11 and the blower housing 12 is provided in the first housing 132, and the first housing 132 and the second housing 133 are detachably connected to facilitate the installation and removal of the blower 11 and the blower housing 12. When the suction device 10 fails, a serviceman needs to detach the blower 11 from the inside of the housing 13 for maintenance, and can take out the blower 11 inside for maintenance by detaching the first housing 132 and the second housing 133. The first housing 132 and the second housing 133 are connected by a clamping connection, and any other detachable connection manner, such as magnetic attraction, can be adopted.

According to the suction device 10 provided by the embodiment of the utility model, the area of the first opening end 121 is larger than that of the air inlet 111 of the fan 11, the air inlet area of the air entering the fan 11 is increased, the surface of the concave part 41 is provided with the through holes, the through holes are concaved inwards towards the air outlet channel along the direction opposite to the air flow direction, the air outlet area of the air outlet channel 30 is increased, and the air is accelerated to be guided out.

Referring to fig. 5, fig. 5 is a schematic structural diagram of a cleaning apparatus 100 according to an embodiment of the present utility model, and the embodiment of the present utility model further provides a cleaning apparatus 100, where the cleaning apparatus 100 includes a suction device 10 as described above, and the specific structure of the suction device 10 is discussed above and will not be described herein.

It should be noted that, the cleaning apparatus 100 shown in fig. 5 is a hand-held sweeper, a hand-held scrubber or a hand-held washing and sweeping integrated machine, the cleaning apparatus 100 shown in fig. 5 is merely an example, and the specific structure of the cleaning apparatus 100 is not limited thereto.

Currently, the existing suction device 10 has a small amount of gas sucked in per unit time, and has a limited suction force, so that it is difficult to completely clean dirt or water stains on the ground. The area of the first opening end 121 of the suction device 10 is larger than the area of the air inlet 111 of the fan 11, the air inlet area of the fan 11 is increased, the surface of the concave part 41 is provided with a through hole, and the through hole is concaved inwards towards the air outlet channel along the direction opposite to the air flow direction, so that the air outlet area of the air outlet channel 30 is increased, and the air is accelerated to be led out. The cleaning device provided by the embodiment of the utility model can improve the efficiency of gas inlet and exhaust, further enhance the suction effect of the suction device 10, enhance the capability of the cleaning device 100 for cleaning the surface to be cleaned, and better cooperate with other functions in the cleaning device 100, thereby playing a better cleaning effect.

The cleaning apparatus 100 of the embodiment of the present utility model further includes a soil sucking port 70 and a soil box 71, and both the soil sucking port 70 and the soil box 71 are disposed under the filtering portion 60. The sewage tank 71 sucks the dirt on the surface to be cleaned (usually the ground with the dirt or the dirty ground) into the sewage tank 71 through the dirt suction opening 70, the dirt suction opening 70 is communicated with one end of the dirt suction pipeline 72, the other end of the dirt suction pipeline 72 is arranged in the sewage tank 71, the pipe opening is close to the top of the sewage tank 71, when the dirt is sucked at the dirt inlet pipe opening after the fan 11 is started, the dirt enters the bottom of the sewage tank 71 due to self weight after passing through the dirt suction pipeline 72, wherein the air is continuously driven by the fan 11 to flow through the filtering part 60, enters the air inlet channel 20, enters the inside of the fan 11 and then enters the air outlet channel 30 through the air outlet 112 of the fan 11. Finally, the gas in the gas outlet passage 30 is discharged through the gas outlet 40.

The sump 71 according to an embodiment of the present utility model may be mounted to the cleaning apparatus 100 in various ways, and the sump 71 is detachably mounted to the bottom of the body of the cleaning apparatus 100, so that a user can conveniently clean the sump 71 by removing the sump after the user's cleaning work is completed.

The cleaning device 100 according to the embodiment of the present utility model further includes a rolling brush 80 for brushing a surface such as a floor, a wall, a table, etc., and the rolling brush 80 is connected to a body of the cleaning device through the dirt suction pipe 72, specifically, the rolling brush 80 approximates a cylinder, and a cleaning surface thereof may be a bottom surface or a side surface, which is not limited herein.

In some embodiments, in order to enhance the cleaning effect of the rolling brush 80, the cleaning apparatus 100 of the embodiment of the present utility model further includes a cleaning liquid tank for storing cleaning liquid, and a water spraying assembly for spraying the cleaning liquid of the cleaning liquid tank into the rolling brush 80 so as to wet the rolling brush 80, specifically, one end of a pipe on the water spraying assembly is communicated with the cleaning liquid tank, and the other end of the pipe is communicated with a nozzle, wherein the nozzle can wet the cleaning liquid sprayed by the rolling brush 80.

In still other embodiments, the cleaning solution tank may be provided at a side of the hand-held floor cleaning machine 100, and the pressure generated by the height difference of the nozzle of the water spray assembly is used to spray the rolling brush 80, thereby omitting a power means for spraying.

The cleaning liquid contained in the cleaning liquid tank can be clean water or specially-made cleaning liquid according to a formula, and the cleaning liquid can have the sterilizing effect.

In addition, the cleaning apparatus 100 according to the embodiment of the present utility model further includes a base 81, and the base 81 is used to mount the soil sucking port 70 and the rolling brush 80, so that a user can use the cleaning apparatus 100 conveniently.

The cleaning device 100 according to the embodiment of the present utility model further includes a battery for supplying power to the cleaning device 100, and the battery is detachably connected to the cleaning device 100, so that a user can select a charging mode. In general, a battery refers to a cup, a tank or other container or a part of space of a composite container containing electrolyte solution and metal electrodes to generate current, and a device capable of converting chemical energy into electric energy is provided with a positive electrode and a negative electrode, but the battery is used as an energy source to obtain the electric power with stable voltage, stable current, stable power supply for a long time and little influence of the outside, and the battery has the advantages of simple structure, convenient carrying, simple and easy charging and discharging operation, no influence of the outside climate and temperature, stable and reliable performance and the like, and is a power supply preferred by most electric appliances. Furthermore, in some embodiments, the cleaning device 100 may be wired or wireless, and is not limited herein.

The battery can adopt a traditional storage battery, a lithium battery with lighter weight, a graphene battery and the like, and preferably, the embodiment of the utility model adopts the graphene battery, and the battery has higher charging speed and is more durable than a lithium ion battery at high temperature, and the service life of the battery is four times that of the traditional hydrogenated battery and twice that of the lithium ion battery; and the weight of the battery can be reduced to half of that of a traditional battery due to the characteristics of graphene, so that the graphene battery is adopted in the embodiment of the utility model, and the battery not only has a faster charging speed and service life, but also can lighten the weight of the cleaning equipment 100 and is convenient for the movement of a user.

The embodiment of the utility model can lead the gravity center of the floor washing machine to be more reasonable and the user to operate more comfortably by reasonably arranging the cleaning liquid tank, the suction device 10, the sewage tank 71 and the battery.

The cleaning device 100 of the embodiment of the utility model further comprises a handle 90, so that a user can hold the cleaning device 100 to work conveniently, the floor cleaning machine can be easily stuck on the ground to wipe back and forth, the experience of the user is further enhanced, the fatigue of the work is reduced, in particular, the handle 90 comprises a vertical rod 91 and a handrail part 92, the vertical rod 91 is connected with the body of the cleaning device 100, and the handrail part 92 is convenient for the user to hold.

In addition, be provided with the on & off switch in the front side of handrail portion 92, be provided with the water spray key at the rear portion of handrail portion 92, on & off switch and water spray key are all connected with the battery electricity, and the water spray key is used for controlling the washing liquid in the washing liquid case and sprays to round brush 80 to the on & off switch has gear adjustment function, can be fit for more operational environment, further strengthens user's experience.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (10)

1. A suction device, comprising:

the fan comprises an air inlet and an air outlet which are communicated;

the fan cover is sleeved on the fan and comprises a first opening end, and the first opening end is communicated with an air inlet of the fan to form an air inlet channel;

the fan and the fan cover are arranged in the accommodating space of the shell, an air outlet channel is formed in a gap between the shell and the fan cover, and an air outlet of the fan is communicated with the air outlet channel; and

the exhaust port is arranged on the shell and is communicated with the air outlet through the air outlet channel, an inner concave part is arranged at the exhaust port, a through hole for air flow to pass through is formed in the surface of the inner concave part, and the inner concave part is concaved inwards towards the air outlet channel along the direction opposite to the air flow direction.

2. The suction device as claimed in claim 1, wherein the housing comprises a bottom surface, the bottom surface being provided with a mounting opening, the first open end of the fan housing being provided on the mounting opening, the first open end protruding outwards with respect to the bottom surface.

3. The suction apparatus of claim 2 wherein the cross-sectional area of the intake passage tapers from the first open end of the fan housing to the air intake of the fan.

4. A suction device according to any one of claims 1 to 3, wherein the recess comprises first and second side walls connected in a V-shape, the through-hole being provided in the first and second side walls.

5. The aspiration device of claim 4, wherein the through-hole is an elongated through-hole.

6. The suction device as claimed in claim 5, further comprising a fixing plate installed at the bottom of the housing, the fixing plate being provided with a second opening in a thickness direction which is matched with the first opening end, the concave portion extending from the fixing plate toward the inside of the housing.

7. A suction device according to any one of claims 1 to 3, wherein the fan housing comprises a socket portion and an extension portion integrally connected to the socket portion, the socket portion being arranged around the fan, the extension portion extending in a direction away from the fan in an axial direction of the fan, the extension portion forming the first open end away from an end of the fan.

8. The aspiration device of claim 7 wherein said socket and said extension are of resilient construction, said socket being in sealing engagement with said fan peripheral side, said first open end being adapted for sealing engagement with an exhaust end of a waste tank.

9. The suction apparatus as claimed in claim 6, wherein the fixing plate is disposed obliquely with respect to an axial direction of the blower.

10. A cleaning appliance comprising a suction device as claimed in any one of claims 1 to 9.