1. A self-cleaning exhaust fan comprises a shell, an air channel arranged in the shell, an air inlet mesh enclosure arranged in the air channel, an air outlet mesh enclosure arranged in the air channel, a motor cylinder arranged in the air channel and positioned between the air inlet mesh enclosure and the air outlet mesh enclosure, a motor arranged in the motor cylinder, a transmission shaft arranged at one end of the motor and extending to the outside of the motor cylinder, and an impeller sleeved on the transmission shaft; the method is characterized in that: the rainwater flow channel is arranged above the air channel, one end of the rainwater flow channel is communicated with a rainwater outlet which is arranged above the air inlet mesh enclosure and used for discharging rainwater to the air inlet mesh enclosure, the other end of the rainwater flow channel is communicated with a rainwater collecting opening used for collecting rainwater, a drainage flow channel arranged below the air channel is arranged inside the shell, one end of the drainage flow channel is communicated with a water outlet combination arranged below the air inlet mesh enclosure, and the other end of the drainage flow channel is communicated with a water outlet.

2. A self-cleaning exhaust fan as claimed in claim 1, wherein: the rainwater collecting port is arranged in a funnel shape with a large upper part and a small lower part.

3. A self-cleaning exhaust fan as claimed in claim 1, wherein: and a filter screen is arranged at the top of the rainwater collecting port.

4. A self-cleaning exhaust fan as claimed in claim 1, wherein: the air duct comprises a first air inlet section, a second air inlet section arranged at one end of the first air inlet section, and an air exhaust section arranged at one end of the second air inlet section, which is far away from the first air inlet section; the air inlet mesh enclosure is arranged on the air exhaust section, the rainwater outlet is arranged on the air exhaust section, and the rainwater outlet is positioned between the second air inlet section and the air inlet mesh enclosure; the water outlet combination comprises a first water outlet arranged on the air exhaust section and located on one side of the air inlet mesh enclosure, a second water outlet arranged on the air exhaust section and located on the other side of the air inlet mesh enclosure, and a third water outlet arranged on the second air inlet section.

5. A self-cleaning exhaust fan as claimed in claim 4, wherein: the first air inlet section is in a horn-shaped arrangement gradually reduced along the direction from the second air inlet section to the air exhaust section, the inner diameter of the second air inlet section is in a horn-shaped arrangement gradually reduced along the direction from the first air inlet section to the air exhaust section, and the air exhaust section is in a horn-shaped arrangement gradually enlarged along the direction from the first air inlet section to the second air inlet section.

6. A self-cleaning exhaust fan as claimed in claim 5, wherein: the maximum inner diameter of the second air inlet section is larger than the minimum inner diameter of the first air inlet section, and the minimum inner diameter of the air exhaust section is larger than the minimum inner diameter of the second air inlet section.

7. A self-cleaning exhaust fan as claimed in claim 1, wherein: the outer wall of the motor barrel is fixedly connected with a plurality of guide vanes, and the motor barrel is fixedly connected with the inner wall of the air channel through the guide vanes.

8. A self-cleaning exhaust fan as claimed in claim 1, wherein: the impeller comprises an air duct and a plurality of fan blades arranged on the outer wall of the air duct.

9. A self-cleaning exhaust fan as claimed in claim 8, wherein: the fan blade is provided with six pieces.

Background

The exhaust fan drives blades to rotate by a motor to drive airflow, so that indoor air and outdoor air are exchanged; the purpose of air exhaust is to remove indoor dirty air, regulate temperature, humidity and sense effect; because the exhaust fan is generally fixedly installed at the indoor top, a lot of dust is accumulated on the exhaust fan after long-term use, the cleaning is inconvenient, and the dust can influence the working efficiency of the exhaust fan.

An exhaust fan with a self-cleaning function also appears in the prior art, such as an exhaust fan disclosed in chinese patent application No. 201810283661.8, which includes a casing, an electric cylinder, a motor, fan blades, a connecting shaft, a dust removing device, an air inlet mesh enclosure, an air outlet mesh enclosure, a clutch device, an installation plate and a drainage device; the end of the rotating shaft of the motor is provided with a clutch device which is matched and connected with the dust removal device; the dust removal device is rotatably arranged in the center of the air inlet mesh enclosure through a connecting shaft; a spray pipe is arranged above the air inlet mesh enclosure, and a drainage device is arranged below the air inlet mesh enclosure; although the patent can realize the automatic cleaning of the air inlet mesh enclosure through the dust removal device, the clutch device, the spray pipe and the drainage device, and remove the dust on the air inlet mesh enclosure; but this patent dust collector's wiper blade and brush board all are located the wind channel, and the surface of wiper blade still is provided with brush piece and sponge piece, wiper blade and brush board can block to the formation of wind current in the wind channel, work efficiency to the fan has very big adverse effect, and this patent is through setting up the shower in the top of air inlet screen panel, utilize the shower to spray water to the air inlet screen panel and wash, because the exhaust fan is generally according to at the top of building, this patent has set up the shower, just must set up the inlet tube with the shower intercommunication, the inlet tube needs intercommunication water pump and cistern, consequently this kind of mode that sprays and wash the air inlet screen panel of this patent has the loaded down with trivial details of structure, the installation is complicated and the big scheduling problem of power consumption.

Disclosure of Invention

In view of the above, the present invention aims to provide a self-cleaning exhaust fan which does not need to install a cleaning assembly in an air duct, has a simple structure, is convenient to install, saves energy and is environment-friendly.

In order to solve the technical problems, the technical scheme of the invention is as follows: a self-cleaning exhaust fan comprises a shell, an air channel arranged in the shell, an air inlet mesh enclosure arranged in the air channel, an air outlet mesh enclosure arranged in the air channel, a motor cylinder arranged in the air channel and positioned between the air inlet mesh enclosure and the air outlet mesh enclosure, a motor arranged in the motor cylinder, a transmission shaft arranged at one end of the motor and extending to the outside of the motor cylinder, and an impeller sleeved on the transmission shaft; the rainwater flow channel is arranged above the air channel and communicated with one end of the rainwater flow channel, a rainwater outlet which is arranged above the air inlet mesh enclosure and used for discharging rainwater to the air inlet mesh enclosure and washing the air inlet mesh enclosure is formed in the shell, a rainwater collecting opening used for collecting rainwater is communicated with the other end of the rainwater flow channel, a drainage flow channel arranged below the air channel is arranged in the shell, a water outlet combination arranged below the air inlet mesh enclosure is communicated with one end of the drainage flow channel, and a water outlet is communicated with the other end of the drainage flow channel.

Furthermore, the rainwater collecting opening is in a funnel shape with a large upper part and a small lower part.

Furthermore, a filter screen is arranged at the top of the rainwater collecting opening.

Furthermore, the air duct comprises a first air inlet section, a second air inlet section arranged at one end of the first air inlet section, and an air exhaust section arranged at one end of the second air inlet section far away from the first air inlet section; the air inlet mesh enclosure is arranged on the air exhaust section, the rainwater outlet is arranged on the air exhaust section, and the rainwater outlet is positioned between the second air inlet section and the air inlet mesh enclosure; the water outlet combination comprises a first water outlet arranged on the air exhaust section and located on one side of the air inlet mesh enclosure, a second water outlet arranged on the air exhaust section and located on the other side of the air inlet mesh enclosure, and a third water outlet arranged on the second air inlet section.

Furthermore, the first air inlet section is arranged in a horn shape which is gradually reduced along the direction from the second air inlet section to the air exhaust section, the inner diameter of the second air inlet section is arranged in a horn shape which is gradually reduced along the direction from the first air inlet section to the air exhaust section, and the air exhaust section is arranged in a horn shape which is gradually enlarged along the direction from the first air inlet section to the second air inlet section.

Furthermore, the maximum inner diameter of the second air inlet section is larger than the minimum inner diameter of the first air inlet section, and the minimum inner diameter of the air exhaust section is larger than the minimum inner diameter of the second air inlet section.

Further, a plurality of guide vanes which are distributed in the circumferential direction are fixedly connected to the outer wall of the motor barrel, and the motor barrel is fixedly connected with the inner wall of the air channel through the guide vanes.

Furthermore, the impeller comprises an air duct and a plurality of fan blades arranged on the outer wall of the air duct.

Further, the fan blade is provided with six pieces.

The technical effects of the invention are mainly embodied as follows: through rainwater collection mouth, rainwater runner and rainwater export can be arranged the rainwater to the air inlet screen panel on, and can wash the cleanness to the air inlet screen panel through the rainwater, thereby can reduce the dust on the air inlet screen panel, rethread outlet combination, drainage runner and delivery port can be arranged sewage to outdoor, compared with the prior art, this automatically cleaning exhaust fan need not clean the subassembly at wind channel internally mounted, also need not external subassembly and the power supply of intaking, just can realize the self-cleaning of air inlet screen panel through the rainwater, consequently this automatically cleaning exhaust fan has simple structure, be convenient for installation and energy-concerving and environment-protective advantage, and this automatically cleaning exhaust fan can also be through first air inlet section, the second air inlet section sets up with the step of the section of airing exhaust, avoid the rainwater to flow backward to indoor.

Drawings

FIG. 1 is a schematic view of a self-cleaning exhaust fan according to the present invention;

FIG. 2 is a schematic structural view of the housing and air duct of FIG. 1;

FIG. 3 is a schematic view of the connection of the motor, drive shaft and impeller of FIG. 1;

fig. 4 is a side view of the impeller of fig. 3.

Detailed Description

The following detailed description of the embodiments of the present invention is provided in order to make the technical solution of the present invention easier to understand and understand.

In the present embodiment, it should be understood that the terms "middle", "upper", "lower", "top", "right", "left", "above", "back", "middle", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the present embodiment, if the connection or fixing manner between the components is not specifically described, the connection or fixing manner may be a bolt fixing manner, a pin connecting manner, or the like, which is commonly used in the prior art, and therefore, details thereof are not described in the present embodiment.

The utility model provides a self-cleaning exhaust fan, as shown in fig. 1, includes casing 1, sets up casing 1 inside and the wind channel 2 that sets up for both ends opening sets up air inlet screen panel 3 in the wind channel 2 sets up air outlet screen panel 4 in the wind channel 2 sets up in the wind channel 2, and is located motor section of thick bamboo 5 between air inlet screen panel 3 and the air outlet screen panel 4 sets up motor section of thick bamboo 6 inside motor section of thick bamboo 5 sets up motor 6, the setting is in and extend to the transmission shaft 7 of motor section of thick bamboo 5's outside, the suit sets up impeller 8 on the transmission shaft 7. Fixedly connected with on the outer wall of motor case 6 is a plurality of stator 61 that circumference distributes, motor case 6 carries out fixed connection through stator 61 and the inner wall in wind channel 2. Reference numeral 101 is an air intake arrow.

As shown in fig. 2, a rainwater flow channel 11 located above the air duct 2 is arranged inside the housing 1, one end of the rainwater flow channel 11 is communicated with a rainwater outlet 12 located above the air inlet mesh enclosure 3 and used for discharging rainwater onto the air inlet mesh enclosure 3 and washing the air inlet mesh enclosure 3, the other end of the rainwater flow channel 11 is communicated with a rainwater collecting port 13 used for collecting rainwater, a drainage flow channel 14 located below the air duct 2 is arranged inside the housing 1, one end of the drainage flow channel 14 is communicated with a drainage port assembly 15 located below the air inlet mesh enclosure 3, and the other end of the drainage flow channel 14 is communicated with a water outlet 16.

The rainwater collecting port 13 is arranged in a funnel shape with a large upper part and a small lower part. In rainy days, the funnel-shaped rainwater collecting opening 13 can collect more rainwater, so that the rainwater outlet 12 can discharge more rainwater onto the air inlet mesh enclosure 3 and wash the air inlet mesh enclosure 3 more thoroughly, and more dust adhered to the air inlet mesh enclosure 3 is reduced. A filter screen 131 is arranged at the top of the rainwater collecting port 13. The filter screen 131 is arranged to intercept large impurities, so that the large impurities are prevented from entering the rainwater flow channel 11 and blocking the rainwater flow channel.

The air duct 2 comprises a first air inlet section 21, a second air inlet section 22 arranged at one end of the first air inlet section 21, and an air exhaust section 23 arranged at one end, far away from the first air inlet section 21, of the second air inlet section 22; the air inlet mesh enclosure 3 is arranged on the air exhaust section 23, the rainwater outlet 12 is arranged on the air exhaust section 23, and the rainwater outlet 12 is positioned between the second air inlet section 22 and the air inlet mesh enclosure 3; dust is mainly adhered to the air inlet side of the air inlet mesh enclosure 3, so that the rainwater outlet 12 is arranged on the air inlet side of the air inlet mesh enclosure 3, rainwater can be better utilized to wash the air inlet mesh enclosure 3, and the dust on the air inlet mesh enclosure 3 is reduced.

The first air inlet section 21 is arranged in a horn shape gradually reduced along the direction from the second air inlet section 22 to the air exhaust section 23, the second air inlet section 22 is arranged in a horn shape gradually reduced along the direction from the first air inlet section 21 to the air exhaust section 23, and the air exhaust section 23 is arranged in a horn shape gradually enlarged along the direction from the first air inlet section 21 to the second air inlet section 23. The inner diameter of the first air inlet section 21 is gradually reduced along the wind direction, and the increase of the air inlet flow is facilitated, so that the full-pressure efficiency of the fan is improved; the indoor air is changed into full pressure through the rotation of the impeller 8, the inner diameter of the air exhaust section 23 is gradually enlarged along the wind direction, and the pressure loss can be reduced by slowing down the wind speed in the full pressure, so that the static pressure efficiency of the fan is improved.

The maximum inner diameter of the second air intake section 22 is greater than the minimum inner diameter of the first air intake section 21, and the minimum inner diameter of the air exhaust section 23 is greater than the minimum inner diameter of the second air intake section 22. As can be understood by referring to fig. 1-2, after the internal diameter relationship of the first air intake section 21, the second air intake section 22 and the air exhaust section 23 is defined, a step-shaped protrusion is arranged between the first air intake section 21 and the second air intake section 22, and another step-shaped protrusion is arranged between the second air intake section 22 and the air exhaust section 23, so that rainwater falling into the air duct 2 from the rainwater outlet 12 can be prevented from flowing backwards into the room through the first air intake section 21 and the second air intake section 22 by the two step-shaped protrusions, and thus the fan can not only wash the air intake screen 3 by using rainwater, reduce dust adhered to the air intake screen 3, but also prevent rainwater from flowing backwards into the room through the step-shaped protrusions.

The water outlet assembly 15 includes a first water outlet 151 disposed on the air exhaust section 23 and located on one side of the air intake mesh enclosure 3, a second water outlet 152 disposed on the air exhaust section 23 and located on the other side of the air intake mesh enclosure 3, and a third water outlet 153 disposed on the second air intake section 22. Through the combined application of the first water outlet 151, the second water outlet 152 and the third water outlet 153, the rainwater entering the air duct 2 through the rainwater outlet 12 can be discharged to the outdoor better and faster, and the rainwater is prevented from flowing back into the indoor space.

As shown in fig. 3 to 4, the impeller 8 includes an air duct 81, and a plurality of blades 82 disposed on an outer wall of the air duct 81. Six blades are provided for the fan blade 82. Compared with an exhaust fan with five fan blades, the exhaust fan with six fan blades has more uniform wind speed.

The technical effects of the invention are mainly embodied as follows: through rainwater collection mouth, rainwater runner and rainwater export can be arranged the rainwater to the air inlet screen panel on, and can wash the cleanness to the air inlet screen panel through the rainwater, thereby can reduce the dust on the air inlet screen panel, rethread outlet combination, drainage runner and delivery port can be arranged sewage to outdoor, compared with the prior art, this automatically cleaning exhaust fan need not clean the subassembly at wind channel internally mounted, also need not external subassembly and the power supply of intaking, just can realize the self-cleaning of air inlet screen panel through the rainwater, consequently this automatically cleaning exhaust fan has simple structure, be convenient for installation and energy-concerving and environment-protective advantage, and this automatically cleaning exhaust fan can also be through first air inlet section, the second air inlet section sets up with the step of the section of airing exhaust, avoid the rainwater to flow backward to indoor.

Of course, the above is only a typical example of the present invention, and besides, the present invention may have other embodiments, and all technical solutions formed by using equivalent substitutions or equivalent transformations fall within the scope of the present invention.