CN217159484U - Effectual fan subassembly for surface cleaning machine airs exhaust - Google Patents

Abstract

The utility model provides an effectual fan subassembly for surface cleaning machine airs exhaust, include: the air conditioner comprises a motor shell, a motor arranged in the motor shell, a movable impeller driven by the motor, and an air cover for covering the movable impeller; the motor shell comprises an upper shell and a lower shell, an air inlet is arranged on the upper shell, the fan assembly further comprises an exhaust cavity and an exhaust channel, the exhaust cavity is arranged around the lower shell, the exhaust channel comprises a first channel which traverses the exhaust cavity and is isolated from the exhaust cavity, an inlet of the first channel is arranged on the lower shell and is communicated with the interior of the motor shell, an outlet of the first channel is arranged on the outer wall of the exhaust cavity, the fan cover is communicated and connected with the exhaust cavity, and a cold air suction port is arranged at the bottom of the fan cover; the area of the cold air suction opening is S1, the cross-sectional area of the exhaust cavity is S2, and S1 is more than 0.65 and S2 is less than 0.95. The utility model discloses a fan subassembly passes through the air intake and gets into cold wind, cools down to the motor, gets into cold wind through cold wind suction opening and cools down motor casing, and the radiating effect is good.

Description

Effectual fan subassembly for surface cleaning machine airs exhaust

Technical Field

The utility model belongs to the technical field of cleaning device, a effectual fan subassembly for surface cleaning machine airs exhaust is specifically provided.

Background

The motor that uses on the general life electrical apparatus can generate heat at the during operation, if the motor leads to the temperature rise when too high because of generating heat, then can influence the working property of motor. In order to dissipate heat of the motor, a shell for mounting the motor is either an open structure including an upper support structure and a lower support structure, or the shell is provided with more or larger ventilation holes for dissipating heat of the motor in the shell.

But the dirty motor of taking out of current floor cleaning machine is owing to need inhale sewage or filth to flourishing dirty bucket in, set up the motor in the top of flourishing dirty bucket usually, lead to the motor to inhale steam or some corrosive gas very easily, consequently, the housing of motor adopts confined plastic casing to make mostly, and the center at both ends all is provided with the bearing room of built-in bearing about the motor casing, stretches out motor casing from the bearing of one end wherein, and sets up the sealing washer between motor shaft and casing. Therefore, when the motor works for a long time and the temperature rise of the motor is caused, the heat can not be quickly and effectively dissipated, and the performance of the motor during working is influenced. In addition, the motor shell is also influenced by the heat of the motor, so that the shell is also in a hotter state, and the shell deforms when being heated seriously, so that the service environment of the motor is worse, and the service lives of the motor and the drive plate are influenced for a long time.

SUMMERY OF THE UTILITY MODEL

In order to solve the above-mentioned problem among the prior art, be the relatively poor problem of solving current motor during operation heat dissipation promptly, the utility model provides an effectual fan subassembly for surface cleaning machine airs exhaust, include: the fan comprises a motor shell, a motor arranged in the motor shell, a movable impeller driven by the motor, and a fan cover for covering the movable impeller inside the motor shell; the motor shell comprises an upper shell and a lower shell, and an air inlet used for ventilating the motor is formed in the upper shell;

the fan assembly further comprises an air exhaust cavity with an upper opening and a lower opening and an air exhaust channel for exhausting hot air generated in the motor shell through the air exhaust cavity, the air exhaust cavity is arranged around the lower shell, the air exhaust channel comprises a first channel which traverses the air exhaust cavity and is isolated from the air exhaust cavity, an inlet of the first channel is arranged on the lower shell and is communicated with the interior of the motor shell, an outlet of the first channel is arranged on the outer wall of the air exhaust cavity, the fan cover is communicated and connected with the air exhaust cavity, a cold air suction port for radiating the fan assembly is arranged at the bottom of the fan cover, and an upper port of the air exhaust cavity is open and faces the motor shell;

the area of the cold air suction opening is S1, the cross-sectional area of the exhaust cavity is S2, and S1 is more than 0.65 and less than 0.95 is more than S2.

Preferably, the outer wall of the lower shell and the inner wall of the exhaust cavity are both of a straight cylinder structure, and the exhaust cavity is internally and obliquely provided with air guide blades.

Preferably, adjacent two of the wind guide blades have a gap in projection on a horizontal plane.

Preferably, the part of the outer wall of the lower shell, which extends out of the air exhaust cavity, is of an inverted cone structure, the inner wall of the air exhaust cavity is of a straight cylinder structure, and air guide blades which are vertically arranged are distributed in the air exhaust cavity.

Preferably, the lower shell is connected with the cavity wall of the exhaust cavity through the air guide blade to form an integrated structure;

the motor shaft penetrates through the built-in bearing and extends downwards until the motor shaft is connected with the movable impeller in the fan cover, and air guide ribs are arranged on the outer wall of the bearing chamber and the outer wall of the lower shell.

Preferably, the exhaust passage further comprises a second passage, one end of the second passage is communicated with the outlet, and the other end of the second passage is communicated with the cold air suction port.

Preferably, the fan housing is sleeved outside the lower port of the exhaust cavity, the upper end of the fan housing is flush with the outer wall of the exhaust cavity, the fan assembly further comprises an outer cover, and the upper port of the exhaust cavity is provided with a limiting step;

the export sets up the below of spacing step is located the top of fan housing, the dustcoat cover is established on the outer wall in exhaust chamber and will it is in it to go out the mask, the top of dustcoat with spacing step is contradicted, so that the second passageway is located the outer wall in exhaust chamber the outer wall of fan housing and between the dustcoat.

Preferably, the outer wall of the exhaust cavity and the outer wall of the fan housing are further provided with air guide grooves which are connected smoothly, the outlet is arranged in the air guide groove, and the upper end of the outer cover is tightly attached to the outer wall of the exhaust cavity, so that the air guide groove and the outer cover form a second channel.

Preferably, the upper port of the exhaust cavity is provided with a limiting step, the outlet is arranged below the limiting step, the fan housing is sleeved on the outer wall of the exhaust cavity and covers the outlet, the upper end of the fan housing is abutted against the limiting step, and the second channel is located between the outer wall of the exhaust cavity and the inner wall of the fan housing.

Preferably, an air guide groove is formed in the outer wall of the exhaust cavity, and the outlet is formed in the air guide groove, so that the fan cover and the air guide groove form a second channel.

As can be understood by those skilled in the art, the fan assembly for a surface cleaning machine with good air exhaust effect of the present invention at least has the following beneficial effects:

1. through being provided with the air intake that is used for ventilating the motor on last casing to make external cold wind can enter into the inside of motor casing through the air intake and flow through around the motor, take away the heat that the motor produced in the motor casing, and accomplish the first passageway that communicates in the hot-blast continuation flow that forms after the cooling can flow through and the motor casing, and discharge the casing of motor outside through first passageway with hot-blast, in order to realize through the heat dissipation cooling of external air current to the motor. And, the entry of first passageway sets up on motor casing, and the export of first passageway sets up in the outer wall in exhaust chamber, and hot-blast can discharge outside the chamber of airing exhaust through first passageway, through the aforesaid mode of setting up for exhaust hot-blast can not blow to motor casing again, avoids appearing motor casing and is heated the phenomenon that the wind blows and leads to motor casing intensification, more is favorable to the inside heat dissipation of motor.

And, seted up cold wind suction mouth through the bottom at the fan housing for external cold wind can be through getting into to the intracavity of airing exhaust under the drive effect at movable vane, and the last port in chamber of airing exhaust sets up to the open form of motor casing, makes by inspiratory cold wind can blow to motor casing, further cools down motor casing. Consequently, inhale cold wind through the air intake at last casing in order to cool down motor casing's inside, cold wind suction mouth has been seted up in the bottom of fan housing simultaneously, make cold wind can cool down motor casing's outside, make whole motor when carrying out suction work to the filth, can cool down the heat dissipation comprehensively through the inner loop of cold wind and outside forced air cooling, the radiating effect is improved, the operational environment of motor and drive plate has further been optimized, the life of motor and drive plate has been guaranteed, the dirty work efficiency of product suction has still been improved simultaneously, the suction effect of product has been improved.

By setting the area of the cold air suction opening to be S1, the cross section area of the exhaust cavity to be S2 and the ratio between S1 and S2 to be 0.65 < S1/S2 < 0.95, the moving impeller is ensured to have enough suction force, and meanwhile, cold air sucked from the cold air suction opening can be smoothly exhausted through the exhaust cavity, and the motor shell (particularly the lower shell part) is cooled. Because the upper shell is provided with the air inlet, heat generated by the working of the motor is mainly concentrated on the lower shell, and the temperature of the upper shell is lower than that of the lower shell. Through the setting mode, the lower shell of the motor can be surrounded by the exhaust cavity, the area of the exhaust cavity and the cold air suction opening is relatively reasonable, cold air can be blown to the motor shell and fully flows around the motor shell in the exhaust cavity under the driving of the movable impeller, and the heat dissipation and cooling of the motor shell are facilitated.

And, if the value of S1/S2 sets up the form that is greater than 0.95, can guarantee the area of cold air suction opening for the cold air that gets into to the intracavity of airing exhaust through cold air suction opening is more, is favorable to improving the air-cooled effect to motor casing outside. Simultaneously, when guaranteeing cold wind suction opening area, owing to need maintain the whole size of fan subassembly unchangeable, also can lead to the lower casing diameter undersize of motor correspondingly, be unfavorable for the installation of motor, the clearance between motor and the casing diminishes, also can restrict the inside thermal flow of motor casing, and then be unfavorable for the circulation speed and the efficiency of the interior wind of motor casing, influences the radiating effect of motor casing inner space.

In addition, if the value of S1/S2 is set to be less than 0.65, although the space in the motor housing can be freely designed, which is beneficial to the circulation heat dissipation inside the fan assembly, the overall structure of the motor housing is larger, which results in that the fan assembly needs to occupy more space, which is not beneficial to the overall modeling design of the fan assembly. In addition, be unlikely to too big in order to guarantee the overall structure design of fan subassembly, then can restrict the size in chamber of airing exhaust correspondingly, the effect of airing exhaust in chamber and speed production influence of airing exhaust, and then can cause the chamber of airing exhaust to motor casing's outside forced air cooling not enough, be unfavorable for the heat dissipation of motor equally, it is slow to lead to the space cooling heat dissipation that is used for holding motor and drive plate, not only influence the operational environment of the two, can lead to the temperature rise of motor and drive plate too high even when serious, influence its working parameter and performance.

2. Still be provided with the second passageway through the chamber of airing exhaust, and set up the one end of second passageway into being linked together with the export, the other end and the cold air suction mouth of second passageway are linked together, so that can not directly blow to the outer wall in the chamber of airing exhaust through the exhaust hot-blast of first passageway in the motor casing, but flow to cold air suction mouth through the second passageway, make exhaust hot-blast can mix with the cold air of cold air suction mouth suction, discharge after the further cooling through the chamber of airing exhaust, the temperature of fan subassembly exhaust wind has been controlled, make the ambient temperature that whole fan subassembly is located not have great rising, the outside operational environment temperature of fan subassembly has been guaranteed.

3. Through being provided with the dustcoat on the fan subassembly to be provided with spacing step in the last port department in the chamber of airing exhaust, make the dustcoat locate the lateral wall in the chamber of airing exhaust and the lateral wall of fan housing when the cover, the top of dustcoat can offset with spacing step, guarantees that the dustcoat can not appear removing by a wide margin. And, the dustcoat that the installation targets in place can enclose into the second passageway with the outer wall of fan housing and the outer wall in exhaust chamber jointly simultaneously for the hot-blast of getting into the second passageway can be through exhaust chamber and fan housing outer wall and lower casing phase isolation, and then makes the hot-blast gathering around motor casing in the second passageway, more can not upflow blow to whole motor casing, avoids the outside ambient temperature of motor casing rising to lead to appearing the phenomenon that the motor casing is heated up by the secondary. Simultaneously, the cold air suction opening can also act on the second passageway with suction to the hot-blast suction that gets into in the second passageway gets into the cold air suction opening, makes hot-blast and cold air mix mutually, avoids hot-blast accumulation in the second passageway, leads to the phenomenon of air cycle flow in the second passageway to take place.

Drawings

Some embodiments of the invention are described below with reference to the accompanying drawings, in which:

fig. 1 is a schematic view of an overall structure of a fan assembly according to a first embodiment of the present invention;

fig. 2 is an exploded view of the internal structure of a fan assembly according to a first embodiment of the present invention;

fig. 3 is a sectional view of an internal structure of a fan assembly according to a first embodiment of the present invention;

fig. 4 is a schematic view of an air exhaust structure of a fan assembly according to a first embodiment of the present invention;

fig. 5 is a cross-sectional view of a fan assembly according to a first embodiment of the present invention;

fig. 6 is a schematic diagram of a preferred implementation of a fan assembly according to a first embodiment of the present invention;

fig. 7 is a cross-sectional view of a fan assembly according to a second embodiment of the present invention.

List of reference numerals:

1-motor shell; 11-an upper shell; 111-air inlet; 12-a lower housing; 122-a bearing chamber; 123-wind guiding ribs; 13-drive plate mounting bracket; 2, a motor; 21-a stator; 22-a rotor; 23-motor shaft; 24-a drive plate; 3-moving impeller; 4-wind cover; 41-cold air suction port; 42-a wind guide groove; 5-a venting cavity; 51-wind guide blades; 52-a limit step; 6-an exhaust channel; 61-a first channel; 611-an inlet; 612-an outlet; 62-a second channel; 8-outer cover.

Detailed Description

It is to be understood by those skilled in the art that the embodiments described below are only some of the embodiments of the present invention, which are intended to explain the technical principles of the present invention and not to limit the scope of the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by a person skilled in the art without any inventive work should still fall within the scope of the present invention.

It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicating the directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through the communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The fan assembly for a surface cleaning machine with good air exhaust effect of the present invention is further explained with reference to the accompanying drawings and specific embodiments:

the first embodiment is as follows: as shown in fig. 1 to 3, the blower assembly for a surface cleaning machine of the present invention includes a motor housing 1, a motor 2 disposed inside the motor housing 1, a movable impeller 3 driven by the motor 2, and a fan housing 4 covering the movable impeller 3 inside the motor housing 1. The motor housing 1 comprises an upper housing 11, a lower housing 12 and a drive plate mounting bracket 13 arranged inside the motor housing 1 in the vertical direction, wherein the top of the upper housing 11 is provided with an air inlet 111, and the air inlet 111 is communicated with the outside air and the inner space of the motor housing 1; a driving plate 24 is disposed in an internal space enclosed by the upper housing 11, the driving plate 24 is fixedly mounted on the driving plate mounting bracket 13, and the driving plate 24 is used for controlling the operation and stop of the fan assembly. The motor 2 is arranged in an inner space enclosed by the motor shell 1 and the drive plate mounting bracket 13, and the motor 2 comprises a stator 21 fixedly arranged in the motor shell 1 and a rotor 22 capable of rotating relative to the stator 21; the rotor 22 is connected with a motor shaft 23 and is in driving connection with the movable impeller 3 through the motor shaft 23.

As shown in fig. 3 and 4, the fan assembly of the present invention further includes an air exhaust cavity 5 with an upper opening and a lower opening, and an air exhaust channel 6 for exhausting the hot air generated in the motor housing 1 through the air exhaust cavity 5. The air exhaust cavity 5 is arranged around the lower shell 12, the air exhaust channel 6 comprises a first channel 61 which traverses the air exhaust cavity 5 and is isolated from the air exhaust cavity 5, an inlet 611 of the first channel 61 is arranged on the lower shell 12 and is communicated with the interior of the motor shell 1, an outlet 612 of the first channel 61 is arranged on the outer wall of the air exhaust cavity 5, the air cover 4 is communicated and connected with the air exhaust cavity 5, a cold air suction port 41 for radiating the fan assembly is arranged at the bottom of the air cover 4, and the upper port of the air exhaust cavity 5 is open and arranged towards the motor shell 1.

As can be understood by those skilled in the art, the air inlet 111 for ventilating the motor 2 is formed in the upper housing 11, so that external cold air can enter the interior of the motor housing 1 through the air inlet 111 and flow around the motor 2, heat generated by the motor 2 is taken away from the motor housing 1, and hot air formed after cooling can continue to flow through the first channel 61 communicated with the interior of the motor housing 1, and the hot air is discharged out of the housing of the motor 2 through the first channel 61, so as to achieve heat dissipation and cooling of the motor 2 through external air flow. Moreover, the inlet of the first channel 61 is disposed on the motor housing 1, the outlet 612 of the first channel 61 is disposed on the outer wall of the exhaust cavity 5, and hot air can be exhausted outside the exhaust cavity 5 through the first channel 61, so that the exhausted hot air is not blown to the motor housing 1, the phenomenon that the temperature of the motor housing 1 is increased due to blowing of the hot air by the motor housing 1 is avoided, and heat dissipation inside the motor 2 is facilitated.

And, through having seted up cold wind suction mouth 41 in the bottom of fan housing 4 for external cold wind can be through entering into in the chamber 5 of airing exhaust under the drive effect of impeller 3, and the last port in chamber 5 of airing exhaust sets up to the open form of orientation motor casing 1, makes by inspiratory cold wind can blow to motor casing 1, further cools down motor 2 shell. Consequently, inhale cold wind through the air intake 111 of last casing 11 in order to cool down motor casing 1's inside, cold wind suction mouth 41 has been seted up in the bottom of fan housing 4 simultaneously, make cold wind can cool down motor casing 1's outside, make whole motor 2 when carrying out suction work to the filth, can be through the inner loop of cold wind and outside air-cooled heat dissipation that can cool down comprehensively, the radiating effect is improved, the operational environment of motor 2 and drive plate 24 has further been optimized, the life of motor 2 with drive plate 24 has been guaranteed, the dirty work efficiency of product suction has still been improved simultaneously, the suction effect of product has been improved.

As shown in fig. 4, the area of the cool air suction port 41 provided at the bottom of the hood 4 is S1, the cross-sectional area of the exhaust chamber 5 is S2, and the ratio between S1 and S2 is set to 0.65 < S1/S2 < 0.95, in this embodiment, the ratio between S1 and S2 is 0.85. By setting the ratio between S1 and S2 to 0.65 < S1/S2 < 0.95, the cooling air sucked from the cold air suction port 41 can be smoothly discharged through the air discharge chamber 5 while ensuring sufficient suction force of the impeller 3, thereby cooling the motor housing 1 (particularly, the lower housing 12). Since the upper case 11 is provided with the air inlet 111, heat generated by the operation of the motor 2 is mainly concentrated on the lower case 12, so that the temperature of the upper case 11 is lower than that of the lower case 12. Through the arrangement mode, the lower shell 12 of the motor 2 can be surrounded by the air exhaust cavity 5, the area of the air exhaust cavity 5 and the area of the cold air suction port 41 are relatively reasonable, cold air can be blown to the motor shell 1 and can flow around the motor shell 1 in the air exhaust cavity 5 under the driving of the movable impeller 3, and the heat dissipation and cooling of the motor shell 1 are facilitated.

As shown in fig. 4 and 5, the outer wall of the lower housing 12 of the motor housing 1 and the inner wall of the air exhaust cavity 5 are both configured as a right circular cylinder, the inclined air guide blades 51 are obliquely arranged in the air exhaust cavity 5, so that the air in the air exhaust cavity 5 can be guided by the air guide blades 51 when being exhausted, the exhausted air can flow around the lower housing 12 along the extending direction of the air guide blades 51, the contact area between the cold air and the lower housing 12 is increased, the contact time between the cold air and the lower housing 12 is prolonged, the heat on the surface of the lower housing 12 is taken away by the cold air as much as possible, the utilization rate of the cold air is improved, the cold air can be cooled by air for the lower housing 12 better, and the cooling efficiency of the fan assembly is improved. The phenomenon that cold air utilization rate is low and air cooling effect is poor due to the fact that cold air discharged from the air exhaust cavity 5 is directly blown to the outside and cannot completely contact with the lower shell 12 is avoided.

It should be noted that, in the scheme that the air guiding blade 51 is obliquely disposed in the air discharging cavity 5, a ratio between an area S1 of the cold air suction opening 41 and a cross-sectional area S2 of the air discharging cavity 5 is set to be 0.75 in this embodiment, so as to ensure that the air discharging cavity 5 has a larger size, and further, the air guiding blade 51 distributed in the air discharging cavity 5 also has a larger air guiding area, so as to improve an air guiding effect of the air guiding blade 51.

As shown in fig. 5, there is a gap between the projections of two adjacent air guide blades 51 on the horizontal plane, the projection between two adjacent air guide blades 51 is set to have a form with a gap, so that in the exhaust cavity 5, there is a distance between two adjacent air guide blades 51, and then each air guide blade 51 can exert its own air guide function to the maximum extent, avoid being interfered by the adjacent air guide blade 51, resulting in impact between different airflows, turbulent flow occurs, it is ensured that the air in the exhaust cavity 5 flows stably and orderly, heat on the motor housing 1 can be better taken away, the heat dissipation effect of the fan assembly is improved, and meanwhile, the production and processing are simple, the production efficiency is high, batch production is easier, and the consistency of production can be ensured, and resources are saved.

As shown in fig. 5, the lower casing 12 is connected with the wall of the exhaust chamber 5 through the wind guide blade 51 to form an integrated structure; the bottom of the lower shell 12 is provided with a through hole, the through hole forms a bearing chamber 122 for accommodating the built-in bearing, the motor shaft 23 passes through the built-in bearing and extends downwards until being connected with the movable impeller 3 in the fan housing 4, and the outer wall of the bearing chamber 122 and the outer wall of the lower shell 12 are both provided with air guide ribs 123.

Those skilled in the art can understand that, by setting the lower casing 12 and the wall of the air exhaust cavity 5 to be an integrated structure, and connecting the air guide blade 51 to the wall of the lower casing 12 and the air exhaust cavity 5, the air guide blade 51 can play a role in enhancing the wall of the lower casing 12 and the air exhaust cavity 5, so as to improve the structural strength of the fan assembly, and meanwhile, the lower casing 12 and the wall of the air exhaust cavity 5 of the integrated structure can also effectively control the production cost. And through being provided with air guide rib 123 on the outer wall of lower casing 12 for cold wind in exhaust chamber 5 can be guided by air guide rib 123, thereby forms the air current that blows lower casing 12, with the realization to the effective cooling of lower casing.

As shown in fig. 6, the exhaust duct 6 further includes a second duct 62, one end of the second duct 62 communicates with the outlet 612, and the other end of the second duct 62 communicates with the cold air suction port 41. The second passage 62 is formed by an air guiding groove 42 opened on the outer wall of the exhaust cavity 5 and the outer wall of the fan housing 4, and the outlet 612 is disposed in the air guiding groove 42.

As can be understood by those skilled in the art, by further providing the exhaust cavity 5 with the second channel 62, and setting one end of the second channel 62 to be communicated with the outlet 612, and the other end of the second channel 62 to be communicated with the cold air suction opening 41, hot air exhausted from the motor housing 1 through the first channel 61 does not directly blow to the outer wall of the exhaust cavity 5, but flows to the cold air suction opening 41 through the second channel 62, so that the exhausted hot air can be mixed with the cold air sucked by the cold air suction opening 41, and is exhausted after further cooling through the exhaust cavity 5, the temperature of the air exhausted by the fan assembly is controlled, so that the ambient temperature of the whole fan assembly does not greatly rise, and the working ambient temperature outside the fan assembly is ensured.

As shown in fig. 6, as an alternative of the second passage 62, the fan housing 4 is sleeved outside the lower port of the exhaust cavity 5, the upper end of the fan housing 4 is flush with the outer wall of the exhaust cavity 5, the fan assembly further includes an outer cover 8, and the upper port of the exhaust cavity 5 is provided with a limiting step 52; the outlet 612 is arranged below the limiting step 52 and above the fan housing 4, the outer cover 8 is sleeved on the outer wall of the exhaust cavity 5 and covers the outlet 612 therein, and the top end of the outer cover 8 abuts against the limiting step 52, so that the second channel 62 is located between the outer wall of the exhaust cavity 5, the outer wall of the fan housing 4 and the outer cover 8.

As can be understood by those skilled in the art, the outer cover 8 is arranged on the fan assembly, and the limiting step 52 is arranged at the upper port of the air exhaust cavity 5, so that when the outer cover 8 is sleeved on the outer side wall of the air exhaust cavity 5 and the outer side wall of the fan housing 4, the top of the outer cover 8 can be abutted against the limiting step 52, and the outer cover 8 is ensured not to move greatly. And, the dustcoat 8 of installing in place can enclose into second passageway 62 with the outer wall of fan housing 4 and the outer wall of exhaust chamber 5 jointly simultaneously for the hot-blast of getting into second passageway 62 can be isolated with lower casing 12 through exhaust chamber 5 and fan housing 4 outer wall, and then makes the interior hot-blast gathering around motor casing 1 of second passageway 62, more can not upwards flow and blow to whole motor casing 1, avoids the outside ambient temperature of motor casing 1 to rise and leads to appearing motor casing 1 by the phenomenon of secondary intensification. Meanwhile, the cold air suction opening 41 can also apply suction to the second channel 62 to suck hot air in the second channel 62 into the cold air suction opening 41, so that the hot air can be mixed with cold air, and the phenomenon that the hot air is accumulated in the second channel 62 to cause unsmooth air circulation flow in the second channel 62 is avoided.

As shown in fig. 6, the outer wall of the air exhaust cavity 5 and the outer wall of the fan housing 4 are provided with an air guide groove 42 smoothly connected, the outlet 612 is arranged in the air guide groove 42, and the upper end of the outer cover 8 is tightly attached to the outer wall of the air exhaust cavity 5, so that the air guide groove 42 and the outer cover 8 form the second channel 62.

As can be understood by those skilled in the art, by providing the air guiding groove 42 in smooth connection with the outer wall of the air discharging cavity 5 and the outer wall of the air hood 4, so that the air guiding groove 42 can form an air flow passage, the hot air flowing out from the outlet 612 of the first channel 61 can directly enter the second channel 62 enclosed by the air guiding groove 42 and flow through the second channel 62 to enter the cold air suction opening 41, thereby avoiding the hot air from escaping.

Example two: as shown in fig. 7, compared with the first embodiment, the portion of the outer wall of the lower casing 12 extending out of the exhaust cavity in the present embodiment is configured to be an inverted cone structure, while the inner wall of the exhaust cavity 5 still maintains a straight cylinder structure, and the air guide blades 51 vertically arranged are distributed in the exhaust cavity 5.

As can be understood by those skilled in the art, the portion of the outer wall of the lower shell 12 extending out of the air exhaust cavity is set to be in the inverted cone structure, so that the outer wall of the lower shell 12 in the inverted cone structure can have a larger surface area than the outer wall of the lower shell 12 in the straight cylinder structure, and the contact time between the cold air and the outer wall of the lower shell 12 can be improved. Meanwhile, the air guide blades 51 are vertically distributed, so that cold air discharged from the air exhaust cavity 5 can directly blow to the lower shell 12, and the lower shell 12 is cooled by air cooling, so that the cooling efficiency of the fan assembly is improved.

As shown in fig. 7, the ratio between the area S1 of the cool air suction port 41 and the cross-sectional area S2 of the discharge chamber 5 is set to 0.9 in this embodiment. Because the outer wall of lower casing 12 is the back taper structure in this embodiment, the inner wall in chamber 5 of airing exhaust still keeps the straight drum structure for chamber 5 of airing exhaust has the relatively great region of airing exhaust, and then from a large amount of cold wind that cold wind suction port 41 got into after accomplishing the heat and absorbing, makes things convenient for cold wind to take away the heat, avoids the hot-blast inside of accumulating in chamber 5 of airing exhaust of high temperature, leads to the phenomenon of casing 12 secondary intensification to take place down. Meanwhile, the ratio of the area S1 of the cold air suction opening 41 to the cross section of the exhaust cavity 5 is set to be 0.9, so that the cold air suction opening 41 has a relatively large air inlet area, external air can conveniently and quickly enter the cold air suction opening 41 to participate in air cooling of the lower shell 12, and the cooling effect of the fan assembly is improved.

As shown in fig. 7, the upper port of the exhaust cavity 5 in this embodiment is provided with a limiting step 52, the outlet 612 is disposed below the limiting step 52, the fan housing 4 is sleeved on the outer wall of the exhaust cavity 5 and covers the outlet 612 therein, the upper end of the fan housing 4 is in contact with the limiting step 52, and the second channel 62 is located between the outer wall of the exhaust cavity 5 and the inner wall of the fan housing 4.

As can be understood by those skilled in the art, by disposing the fan housing 4 in a manner that the fan housing 4 can be sleeved on the outer wall of the exhaust cavity 5, the upper end of the fan housing 4 can cover the outlet 612 inside the fan housing, and the top end of the fan housing 4 can contact with the limiting step 52, so that the inner side wall of the fan housing 4 and the outer side wall of the exhaust cavity 5 jointly form the second channel 62, and the airflow is facilitated to flow to the cold air suction port 41 through the second channel 62. This embodiment can save and make extra dustcoat 8, under the prerequisite of guaranteeing the normal circulation of air current, reduces the manufacturing cost of fan subassembly.

As shown in fig. 7, the air guiding groove 42 is disposed on the outer wall of the exhaust cavity 5, and the outlet 612 is disposed in the air guiding groove 42, so that the second channel 62 is formed by the wind cover 4 and the air guiding groove 42.

As can be understood by those skilled in the art, the air guide groove 42 is disposed on the outer wall of the air exhaust cavity 5, so that the air guide groove 42 and the inner side wall of the air hood 4 jointly enclose the second channel 62, and then the hot air flowing out from the outlet 612 of the first channel 61 can directly enter the second channel 62 and flow to the cold air suction port 41 under the restriction of the air guide groove 42 and the air hood 4, thereby completing the circular flow process of the air.

So far, the technical solution of the present invention has been described in connection with the foregoing embodiments, but it is easily understood by those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Without deviating from the technical principle of the present invention, those skilled in the art can split and combine the technical solutions in the above embodiments, and also can make equivalent changes or substitutions for related technical features, and any changes, equivalent substitutions, improvements, etc. made within the technical concept and/or technical principle of the present invention will fall within the protection scope of the present invention.

Claims (10)

1. The utility model provides an effectual fan assembly for surface cleaning machine airs exhaust, includes: the fan comprises a motor shell, a motor arranged in the motor shell, a movable impeller driven by the motor, and a fan cover for covering the movable impeller inside the motor shell; the motor shell comprises an upper shell and a lower shell, the upper shell is provided with an air inlet used for ventilating the motor, the motor is characterized in that,

the fan assembly further comprises an air exhaust cavity with an upper opening and a lower opening and an air exhaust channel for exhausting hot air generated in the motor shell through the air exhaust cavity, the air exhaust cavity is arranged around the lower shell, the air exhaust channel comprises a first channel which traverses the air exhaust cavity and is isolated from the air exhaust cavity, an inlet of the first channel is arranged on the lower shell and is communicated with the interior of the motor shell, an outlet of the first channel is arranged on the outer wall of the air exhaust cavity, the fan cover is communicated and connected with the air exhaust cavity, a cold air suction port for radiating the fan assembly is arranged at the bottom of the fan cover, and an upper port of the air exhaust cavity is open and faces the motor shell;

the area of the cold air suction opening is S1, the cross-sectional area of the exhaust cavity is S2, and S1 is more than 0.65 and less than 0.95 is more than S2.

2. The blower assembly for a surface cleaner with good air exhaust effect according to claim 1, wherein the outer wall of the lower casing and the inner wall of the air exhaust cavity are both in a straight cylinder structure, and air guide blades are obliquely arranged in the air exhaust cavity.

3. The blower assembly for a surface cleaning machine with good air exhaust effect according to claim 2, wherein the projections of two adjacent air guide blades on the horizontal plane have a gap.

4. The blower assembly for a surface cleaning machine with good air exhaust effect according to claim 1, wherein the part of the outer wall of the lower shell, which extends out of the air exhaust cavity, is of an inverted cone structure, the inner wall of the air exhaust cavity is of a straight cylinder structure, and air guide blades which are vertically arranged are distributed in the air exhaust cavity.

5. The fan assembly for the surface cleaning machine with good air exhaust effect according to any one of claims 2 or 4, wherein the lower shell and the cavity wall of the air exhaust cavity are connected into an integrated structure through the air guide blade;

the motor shaft penetrates through the built-in bearing and extends downwards until the motor shaft is connected with the movable impeller in the fan cover, and air guide ribs are arranged on the outer wall of the bearing chamber and the outer wall of the lower shell.

6. The blower assembly for a surface cleaner with good air exhausting effect according to claim 1, wherein the air exhausting passage further comprises a second passage, one end of the second passage is communicated with the outlet, and the other end of the second passage is communicated with the cold air suction opening.

7. The blower assembly for a surface cleaner with good air exhaust effect according to claim 6, wherein the air hood is sleeved outside the lower port of the air exhaust cavity, the upper end of the air hood is flush with the outer wall of the air exhaust cavity, the blower assembly further comprises an outer cover, and the upper port of the air exhaust cavity is provided with a limiting step;

the export sets up the below of spacing step is located the top of fan housing, the dustcoat cover is established on the outer wall in exhaust chamber and will it is in it to go out the gauze mask, the top of dustcoat with spacing step is contradicted, so that the second passageway is located the outer wall in exhaust chamber the outer wall of fan housing and between the dustcoat.

8. The blower assembly for a surface cleaner with good exhaust effect according to claim 7, wherein the outer wall of the exhaust cavity and the outer wall of the fan housing are further provided with air guide grooves which are smoothly connected, the outlet is arranged in the air guide groove, and the upper end of the outer cover is tightly attached to the outer wall of the exhaust cavity, so that the air guide grooves and the outer cover form a second channel.

9. The blower assembly for a surface cleaner having an excellent air discharging effect according to claim 6, wherein a limiting step is provided at an upper port of the air discharging chamber, the outlet is provided below the limiting step, the fan housing is sleeved on an outer wall of the air discharging chamber and covers the outlet therein, an upper end of the fan housing abuts against the limiting step, and the second channel is located between the outer wall of the air discharging chamber and an inner wall of the fan housing.

10. The blower assembly for a surface cleaner with a good air exhaust effect according to claim 9, wherein an air guide groove is formed in an outer wall of the air exhaust cavity, and the outlet is formed in the air guide groove, so that the fan housing and the air guide groove form a second channel.

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