JPH0323399A - Motor driven blower - Google Patents

Abstract

PURPOSE:To improve the suction efficiency of 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 while forming an inclined opening edge in an exhaust port of a fan cover. CONSTITUTION:A wet type motor driven blower 1 capable of sucking air containing moisture has a centrifugal fan 12 attached on 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 provided with a plurality of inclined blades 24 inclining from one side face 21 side to the other side face 22 side formed on the outer surface of a plurality of outer peripheral edges 23 provided on the outer periphery so as to define inclined paths 25 between the adjacent inclined blades 24. An exhaust port 19 formed in a fan cover 16 for covering the diffuser 15 is provided with an inclined opening edge 27 extending along the surface of the inclined blade 24 abutting against the fan cover.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a so-called wet type electric blower that can suck air containing moisture. (b) Conventional technology This type of wet type electric blower, for example,
As shown in Publication No. 6352, air containing moisture is vented from the side of the fan cover.
Therefore, for example, as shown in Figs. 3 to 5, the condenser is attached to the motor frame (4) of the motor (2), covering the centrifugal fan (12) and the diffuser {15}. 40
) are provided with a plurality of rectangular exhaust ports (4l)... on the side of the centrifugal fan (l2), and the air flow discharged from the centrifugal fan (l2) passes through the outer circumference of the diffuser (l5), 41}...was supposed to be exhausted.

Here, the inclined passage (25) is guarded by the inclined wings (24) formed at a predetermined interval on the outer circumferential portion of the diffuser (l5), and the inclined passage F! ! 1
(25), in which the air flow is converted from dynamic pressure to static pressure and then exhausted, the inclined wing part (24) connects the central part of the square exhaust port (4l) as shown in Fig. 4. The air flow is the air passing through the motor frame (4) side of the inclined wing section (24). The air flow is divided into two: L (XI) and air 1 (Y) that passes through the centrifugal fan (+2) Ol!!, and the air flow that passes through the centrifugal fan!12 HOI (Yl hardly passes through the inclined passageway (25) With square exhaust port (
41) is exhausted to the outside, so the pressure is not sufficiently suppressed.
It has the disadvantage of poor suction efficiency. Furthermore, as shown in FIG. 5, if the inclined wing section (24) is arranged so as not to cross the square exhaust port (4I), a pool will be formed between the inclined wing section (24) and the square exhaust port (41). This causes the fan cover (40) to act as an exhaust resistance, preventing smooth exhaust from being carried out.
There is a drawback that the characteristics deteriorate, and there is also the risk of generating wind noise.

(c) Problems to be Solved by the Invention The present invention is a wet-type electric blower capable of sucking air containing moisture, which is simple in construction, has high suction efficiency, and does not generate abnormal noise. The purpose is to obtain a blower.

(2) 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, and a diffuser disposed between the centrifugal fan and the motor. The fan cover has an air intake port in the center and a plurality of exhaust ports on the sides, and is attached to the motor frame of the motor to cover the centrifugal fan and the diffuser. A plurality of inclined blade sections which are inclined toward opening on the other side are formed at predetermined intervals, and an inclined passage communicating with the exhaust port is formed between adjacent inclined blade sections, and the exhaust port is connected to the inclined blade section. It is characterized by having a diagonal opening edge along the fan cover abutting surface. (e) Effect With the above configuration, the centrifugal fan rotates at high speed when driven by the motor, sucks air from the intake port of the fan cover, and the airflow discharged in the radial direction from the outer periphery of the centrifugal fan is directed toward the outer periphery of the diffuser. Dynamic pressure is converted into static pressure by the inclined passage formed in the land, and is exhausted from the exhaust port.

At this time, since the exhaust port has an oblique opening edge along the slanted wing portion forming the slanted passage, the airflow can be smoothly prevented from being accumulated between the slanted passage and the exhaust port. Exhaust is exhausted from the exhaust port, so there is no reduction in suction efficiency or generation of abnormal noise. (f) Embodiment The ellipse of the electric blower of the present invention will be explained below according to the embodiment shown in FIGS. 1 and 2.

(flit) is a wenoto-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 front of the rear case (3). Motor frame that closes the opening (4)
A rotor and a stator are housed inside a motor case (5) consisting of a motor case (5), and a cooling fan (7) is mounted on a rear rotating shaft (6) protruding from the rear case (3) in the t& direction. The cooling fan {7
} A cooling air inlet {8} is formed opposite to the cooling air inlet {8}, and a cooling air outlet (9) is formed on the side, and cooling air passes through the inside of the motor case (5) by rotation of the cooling fan (7). The motor frame (4) is disc-shaped, and forms an annular engagement fq (+01) at the peripheral edge, and a front rotation shaft (1l) of the motor (2) from the central bearing holding part. ) protrudes forward and is supported pivotably.

(l2) is a centrifugal fan fixed to the tip of the front rotating shaft (Ill), which rotates at high speed to suck in air through the central opening (l3) and exhaust air radially through the peripheral opening (14). The centrifugal fan (12) and the motor (
2) is a disc-shaped resin diffuser placed between the (16) is a metal fan cover that is housed in the motor frame (4), covering the centrifugal fan (12) and the diffuser (15), and has an air intake port (1) in the center.
7), and has a plurality of exhaust ports (19)... at predetermined intervals on the circumferential rM surface (18), and the circumferential surface (l8)
) is press-fitted into the annular engagement collar (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 motor frame (4) is formed in the center of the diffuser (15). A bearing hole is bored through the bearing holding portion.

The outer circumferential portion of this Dino user (15) has a plurality of outer circumferential edges (2
3)... are formed continuously, and these outer peripheral edges (23
) on the outside surface from one side (2l) side to the other side (22
) a plurality of inclined wing parts (24)...
are formed, and these adjacent inclined wing parts +241 (2
41, the outer peripheral edge (23) and the fan cover {
the inclined passage (2) surrounded by the circumferential side (18) of
5)... are formed respectively. Furthermore, a flat plate-like top plate part (26) along the circumference of the one side surface (21) is formed on the one side surface (21) side of the inclined wing part (24), and the top plate part (26) The inclined passageway (25) whose starting end side is partially covered forms a volute chamber. Further, as shown in FIG. 2, the exhaust port {19} has on one side an oblique opening edge (27) bent along the fan cover abutting surface (24al) of the inclined blade portion (24). ,
The diagonal opening edge (27) has a whole opening edge (28) in a shape that partially closes the square opening edge, and the diagonal opening edge (27) is extended along the inclined wing portion (24). By arranging them together, the motor frame (4) side of the slanted wing section (24) is smoothly connected to the slanted opening edge (27), and the slanted passageway (25) is communicated with the exhaust port (l9). I'm letting you do it.

When the electric blower (1) is driven, the centrifugal fan (1)
2) rotates at high speed and removes moisture-laden air through the fan cover (
suction from the air intake port (17) of the centrifugal fan (1
2) for radially discharging the air through the peripheral opening (14). This discharged airflow flows from one side (2l) of the diffuser (l5) into the volute chamber through an inclined passage (
25)... is exhausted from the exhaust port (19)... At this time, the exhaust port (19)... is connected to the inclined passage (
25)... The whole opening edge (28) whose side is the oblique opening edge (27) along the inclined wing part (24)...
, so that the discharged airflow flows through the inclined passageway (
25) and the exhaust port (l9), and the air is smoothly exhausted from the exhaust port (l9). Therefore, after all the airflow discharged from the centrifugal fan (12) passes through the inclined passage (25) of the differential user (15) and is converted from dynamic pressure to static pressure, it smoothly flows out from the exhaust port (l9). Therefore, the suction efficiency of the electric blower (1) is improved, and there is no occurrence of abnormal wind plaster due to accumulation of air flow.

Furthermore, since the area of the exhaust port (19) is smaller than that of a conventional square exhaust port, the strength of the fan cover (16) is increased.

(G) Effects of the Invention The electric blower of the present invention is constructed as described above, and in particular, the shape of the opening edge of the exhaust port of the fan cover is changed to an oblique opening edge along the fan cover abutting surface of the slanted wing portion of the diffuser. Because of this shape, all the airflow is smoothly exhausted from the exhaust port after passing through the inclined passage. Therefore, by simply changing the shape of the fan cover, the suction efficiency can be improved, and wind noise etc. at the exhaust port can be reduced. A wet type electric blower that does not generate abnormal noise can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of an embodiment of the electric blower of the present invention;
Fig. 2 is an enlarged side view of the same main part, Fig. 3 is a partially cutaway side view of the conventional example, Fig. 4 is an enlarged side view of the main part of Fig. 3, and Fig. 5 is an enlarged side view of the main part of Fig. 3. This is an enlarged side view of the main part. (2)...Motor, (4)...Motor frame, {l2}...Centrifugal fan, (l5)...Diffuser, (l6)...Fan cover, (l9)...Exhaust port , (24)... Inclined wing section, (25)...
... Slanted passage, (27) ... Slanted opening edge.

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 passage is formed at a predetermined interval and communicates with the exhaust port between adjacent inclined blade parts, and the exhaust port has an inclined opening edge along a fan cover abutting surface of the inclined blade part. An electric blower characterized by having: