JPH0323398A - Motor driven blower - Google Patents

Abstract

PURPOSE:To improve the assembling operability in a wet type motor driven blower by forming a plurality of inclined blades at predetermined intervals on the outer periphery of a diffuser disposed between a centrifugal fan and a motor and forming the side of the inclined blade abutting against a motor frame in a thick portion. CONSTITUTION:A wet type motor driven blower 1 capable of sucking air containing water content has a centrifugal fan 12 attached to the tip end of the front rotary shaft 11 of a motor 2 housed in a motor case 5, and has a diffuser 15 disposed between both members 2, 12. The diffuser 15 is formed, on its outer peripheral portion, with a plurality of peripheral edges 23 provided perpendicularly at predetermined intervals along the outer peripheral portion from one side face 21 side to the other side face 22 side. A plurality of inclined blades 24 inclined from the one side face 21 side to the other side face 22 side are formed on the outer surface of these outer peripheral edges 23 to define inclined paths 25 between the adjacent inclined blades 24, and a thick wall portion 29 is provided on the motor frame 4 side of each inclined blade 24.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a so-called wet-type electric transport MVA that can suck air containing moisture.

(b) Conventional technology This type of wet type electric blower is, for example,
As shown in Japanese Patent No. 6352, it is configured to exhaust air containing moisture from the side of the fan cover.
Therefore, conventionally, for example, as shown in FIGS. 4 to 6, a plurality of rectangular exhaust ports (4l) are provided on the sides of the centrifugal fans (12) and (40), and the centrifugal fans ( l2
) The airflow discharged from the diffuser (15) passed through the outer circumference of the diffuser (15) and was exhausted from the square exhaust ports (41).

Here, an inclined passageway (25) is formed by inclined wing parts (24) formed at predetermined intervals on the outer peripheral portion of the diffuser (15), and this inclined passageway (25
) to convert the air flow from dynamic pressure to static pressure and exhaust the air, as shown in Figure 5, the inclined blade part (2
4) is arranged across the central part of the square exhaust port (4l), and the airflow is directed to the motor frame (4) of the inclined wing part (24) 0! The air flow (X) passing through the centrifugal fan (1 2 1 fill) and the air flow (Yl) passing through the centrifugal fan (1 2 1
1 is exhausted to the outside from the rectangular exhaust port (41) without passing through the inclined passageway (25), so that the static pressure is not sufficiently reduced and the suction efficiency deteriorates. Furthermore, as shown in Fig. 6, if the slanted wing section (24) is arranged so as not to cross the square exhaust port (4l), there will be a gap between the slanted wing section (24) and the square exhaust port (4!). This has the drawback that the fan cover (40) acts as an exhaust resistance due to the accumulation of air, preventing smooth exhaust from being carried out and resulting in a deterioration of characteristics. There is also the risk of generating wind noise. (C) Problem to be Solved by the Invention The present invention provides a wet-type electric blower capable of suctioning air containing moisture, which has a simple configuration, improves assembly workability, and has high suction efficiency. The aim is to obtain an electric blower that does not generate abnormal noise. (two)! Means for Solving the Problems The electric blower of the present invention includes a motor, a centrifugal fan fixed to the rotating shaft of the motor, a diffuser disposed between the centrifugal fan and the motor, and an air intake in the center. and a fan cover that is attached to the motor frame of the motor to cover the centrifugal fan and the diffuser, and the diffuser has a plurality of exhaust ports on the side surface thereof, and the diffuser has a fan cover that is attached to the motor frame of the motor so as to cover the centrifugal fan and the diffuser, and the diffuser has a plurality of exhaust ports on the outer circumference from one side to the other side. Multiple inclinations inclined toward? I wing sections are formed at predetermined intervals, an inclined passageway communicating with the exhaust port is formed between adjacent inclined wing sections, and a thick wall portion is formed on a side of the inclined wing sections that contact the motor frame. It is characterized by the fact that {E} Effect With the above configuration, even if the fan cover is misaligned with respect to the diffuser within the thick part of the slanted blade part, the slanted passage will smoothly communicate with the exhaust port, so the fan cover The installation work becomes easy, and therefore the assembly workability is improved.

The motor drives the centrifugal fan to rotate at high speed, drawing in air from the intake port of the fan cover. After the pressure is converted to quiet pressure, the air is exhausted from the exhaust port. At this time, the inclined passage smoothly communicates with the exhaust port through the thick wall of the inclined blade, so that the airflow is connected to the inclined passage and the exhaust port. The air is smoothly exhausted from the exhaust port without accumulation between the air blower and the air outlet, so there is no reduction in suction efficiency or generation of abnormal noise. This will be explained according to the embodiment shown in FIG.

(11 is a wet type electric blower that can suck air containing moisture, and is equipped with a motor (2) at the rear. The motor (2) is connected to the rear case (3) and the rear case (3). A rotor and a stator are housed inside a motor case (5) consisting of a motor frame (4) that closes the front opening, and a cooling fan ( 7) is pivotally mounted.A cooling air inlet (8) is formed on the bottom surface of the rear case (3) facing the cooling fan (7), and a cooling air outlet {9} is formed on the side surface. , rotation of the cooling fan (7) causes cooling air to pass through the motor case (5).The motor frame (4) has a disc shape and has an annular engagement at the periphery. A flange (10) is formed, and the front rotating shaft <111 of the motor (2) is projected forward from the central bearing holding portion and is pivotally supported.

(l2) is a centrifugal fan fixed to the tip of the front rotating shaft {11}, which rotates at high speed to suck air through the central opening (l3) and rotate around #! Air is discharged radially from the Ig# port (I4).

(l5) is tightened and fixed to the motor frame (4) with a tightening screw, and is connected to the centrifugal fan (12) and the motor (15).
2) is a disc-shaped diffuser made of resin.

(!6) is a metal fan cover that covers the centrifugal fan (I2) and the diffuser (15) and is attached to the motor frame (4), and has an air intake port (l) in the center.
7) and a plurality of exhaust ports (
19)... at predetermined intervals, and the peripheral surface (18)
The ridged locking edge (20) of the ring is press-fitted into the annular engagement N (101) and fixed.

In the diffuser (15), one side surface (2l) of the diffuser (15) on the surface side facing the centrifugal fan (12) is formed into a flat plate shape, and the center part has a part of the motor frame (4). A bearing hole is bored through the bearing holding portion.

The diffuser (l5) has one side (211tl
A plurality of outer peripheral edges (23
)... are formed continuously, and these outer peripheral edges {23}
The outer surface of ... is from one side (2l) side to the other side (22)
A plurality of inclined wing parts (24)... which are inclined toward the side are formed, and these adjacent inclined wing parts +241 (24
) between the outer peripheral edge (23) and the fan cover (l
6) and the peripheral side (18) of the inclined passageway (25).
)... are formed respectively.

Furthermore, a flat plate-shaped top plate part (26) is formed along the periphery of the one side surface (21) on the side of the one side surface (21) of the inclined wing part (24), and the top plate part (26) has a starting point. Said inclined passageway (25), whose sides are partially covered, forms a volute chamber.

Further, as shown in FIG. 2, the exhaust port (l9) has a bent shape along the fan cover contact surface (24a) of the inclined wing portion {24}, and has an opening edge (27) on one side. have,
The diagonal opening edge (27) has a whole opening edge (28) shaped to partially close the square opening edge, and the diagonal opening edge {27} is aligned along the inclined wing portion (24). By arranging them together, the motor frame {4} side of the slanted wing portion (24) is smoothly connected to the slanted opening edge (27), and the slanted passageway (25) is communicated with the exhaust port (19). ing.

Further, as shown in FIG. 2, the tilted wing portion (24)
The plate thickness of the motor frame (41(ill) is gradually thickened in a fan shape, and a thick wall part (29) having a thickness on the motor frame {4} side is formed on the motor frame (4) contact side. .Then, as shown in FIGS. 2(A) to 2(C), the fan cover (16) and the air outlet are connected so that a part of the thick part (29) is exposed from the exhaust port (l9). The fan cover (16) is attached to the motor frame (4) after determining the placement relationship with the fan user (15). The installation work of the fan cover (16) becomes easy, and the assembly workability becomes good.

When the electric blower (1) is driven, the centrifugal fan (l
2) rotates at high speed and removes moisture-laden air through the fan cover (
18) from the intake port (17) of the centrifugal fan (17).
2) exhaust the air in a radial direction from the peripheral opening (14). This discharged airflow flows from one side (21) of the differential user (15) to an inclined passage (
25)... is exhausted from the exhaust port (l9)...

At this time, the exhaust port (l9)... is connected to the inclined passage (
It has a whole opening edge (28) with one side being the oblique opening edge (27) along the inclined wing part (24)... forming the exhaust port (25), and the thick part (29) 19), the inclined passageway (25) and the exhaust port (19) smoothly communicate with each other, and the airflow to be discharged is caused by the inclined passageway (25) and the exhaust port (19). ) The air is smoothly exhausted from the exhaust port (l9) without any accumulation between the air and the air. Therefore, all the airflow discharged from the centrifugal fan (12) passes through the inclined passageway (25) of the diffuser (15), converts dynamic pressure into static pressure, and then smoothly exhausts from the exhaust port (19). Therefore, the suction efficiency of the electric blower (1) is improved, and there is no occurrence of abnormal wind noise due to accumulation of airflow. Furthermore, as shown in Figure 3 (a) to Figure 3 (2), the fan cover (l6) has an oblique opening edge (2).
7) and the motor frame side opening edge (30), the exhaust port (32) has a bent opening edge (3l) for rounding.
) may be formed. In this case, the inclined wing portion (24)
The electric blower {
1) can increase the suction efficiency and prevent abnormal wind noise.

{G} Effects of the Invention The electric blower of the present invention is constructed as described above, and in particular, a portion of the slanted wing portion of the diffuser that ellipses the slanted passage is exposed from the exhaust port of the fan cover on the side in contact with the motor frame. Since all the airflow passes through the inclined passageway, it is smoothly exhausted from the exhaust port.Therefore, with a simple configuration of partially thickening the inclined ribs of the diffuser, the fan cover and It is possible to obtain a wet type electric blower that largely absorbs the positional deviation of a diffuser, improves assembly workability, has high suction efficiency, and does not generate abnormal noise such as wind noise at the exhaust port portion.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of an embodiment of the electric blower of the present invention;
Figure 2 is an enlarged side view of the same main parts, (a), (mouth), {ha l
l. Fig. 3 is an enlarged side view of the main parts of another embodiment of the electric blower of the present invention (a), (b), (b), (b).
2A and 2B are diagrams showing different arrangement states of a fan cover and a diffuser, respectively. Furthermore, Fig. 4 is a partially cutaway side view of the conventional example, and Fig. 5 is a side view of the conventional example.
FIG. 5 is an enlarged side view of the main part in a different state from FIG. 4. (2)...Motor, (4)...Motor frame, (I2)...Centrifugal fan, (l5)...Diffuser, (16}...Fan cover, (191 (3)
21... Exhaust port, (24)... Inclined wing section, (2
5)... Slanted passage, (27)... Peeling opening edge, (29)... Thick part.

Claims (1)

[Claims] (1) A motor, a centrifugal fan fixed to the rotating shaft of the motor, a diffuser disposed between the centrifugal fan and the motor, each having an intake port in the center and a plurality of exhaust ports on the sides. and a fan cover that covers the centrifugal fan and the diffuser and is attached to the motor frame of the motor, and the diffuser has a plurality of sloping blade parts that are slanted from one side toward the other side on an outer peripheral portion. an inclined passageway formed at a predetermined interval and communicating with the exhaust port between adjacent inclined wing parts, on a side of the inclined wing part that contacts the motor frame;
An electric blower characterized by forming a thick part.