JPS6043196A - Motor fan for vacuum cleaner - Google Patents

Abstract

PURPOSE:To increase the attaching strength of a blade, prevent leak current through a hole for retaining nail and improve the ventilating efficiency of the fan by a method wherein a washer, covering a nail-type protuberance provided on the blade, is provided so as to contact with the rear surface shroud of an impeller, which opposes to the blade. CONSTITUTION:The suction port end 21 of the front surface shroud 16 side of a blade 17 is provided with a nail-type protuberance 22 protruding toward a rear surface shroud 18. The nail-type protuberance 22 is inserted into a hole 23 for retaining the nail provided on the rear surface shroud 18. The surface section 24 of the rear surface shroud 18, which opposes to the blade, is provided with the washer having an outer diameter covering said nail-type protuberance 22 and the washer is supported by inserting it into a motor shaft 12. According to this constitution, the attaching strength of the blade 17 is increased, the unstable property of the blade 17 is eliminated, the leak current through the hole 23 for retaining the nail is prevented and the stability of the performance of the fan as well as the ventilating efficiency may be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electric blower for use in vacuum cleaners.

Conventional configuration and its problems Conventionally, the configuration of this type of electric blower is as shown in FIG. Arranged,
It is common to have a casing 6 covering them. Koui. In conventional electric blowers, the method of fixing the blade suction port 9 that protrudes from the impeller suction port 8 of the blade 7 is to cut and raise the rear searoud (cut and raise the blade suction port 9). In electric blowers for vacuum cleaners, the number of revolutions of the impeller is usually 20, ○oO
It rotates at high speeds of rpm to 4o, O○○ rpm.

Therefore, in the conventional method, the area around the blade suction section 90 lacks integrity with respect to the entire impeller, and the blade suction port section 9 becomes unstable during rotation. As a result, problems such as unstable air blowing performance and damage to the blades have been caused.

Purpose of the Invention The present invention (d) solves the problems of conventional electric blowers, ensures the fixation of blades under high-speed rotation such as in electric blowers for vacuum cleaners, and provides stable air blowing performance. Moreover, it is an object of the present invention to provide an electric blower configured to prevent damage to the blades.

Structure of the Invention The electric blower for a vacuum cleaner according to the present invention includes a claw-like projection provided at the suction port end of the blade on the rear shroud side of the impeller, and the claw-like projection is attached to the rear surface of the blade. In addition to being inserted into the rear shroud, a washer is provided on the rear face of the loud to cover the insertion portion of the claw-like protrusion into the rear shroud. This ensures stable performance when the blower is operated, and
The blade is also reinforced.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. In Fig. 2 +C:l)-, 11 is a motor, and an impeller 13 is attached to this motor shaft 12.

An air guide 14 is arranged around the impeller 13, and a casing 15 is provided covering these. The impeller 1
3, as shown in detail in FIGS. 3 to 6, consists of a front searoud 16, a plurality of radially provided blades 17, and a rear shroud 18, which are crimped at a crimping portion 19 to form an integral body. It has become. 20 is a suction port of the impeller 13. The suction port end 21 of the blade 1 on the rear shroud 18 side is similarly located close to the center of the suction port of the blade 17 on the front shroud 16 side. The suction port end 21 is provided with a tab-shaped projection 22 that projects toward the rear sea loud 18. This claw-like projection 22 is attached to the rear shroud 18.
It is inserted into a claw stopper hole 23 provided in the. In addition, the surface portion 24 on the opposite blade side of the rear surface/niroud 18 has a
- A washer 25 having an outer diameter that covers the claw-like protrusion 22 is provided. The washer 25 is inserted into and supported by the motor shaft 12.

26 is a substantially conical entrance guide, and 27 is installed between the washer 26 and the motor 11 side.

The spacer 28 that presses the shroud 26 against the rear cloth shroud 18 is a nut. The impeller 13, together with the conical guide 26 and the spacer 27, is fastened to the nut 28 and attached to the motor lQb 1 h.

29 is a casing suction port, 30 is an air guide 14
31 is a hole for the motor bra.

The operation in the above configuration will be explained. Motor tlQi12
As the impeller 13 rotates, the air is blown.The path of the air flow is casing suction 129 → inside the impeller 13 → air guide 14
The order is from the motor bracket hole 31 to the inside of the motor 11 to the outside of the airflow passage 30-.

Now, looking at the impeller 13, since this electric blower is for a vacuum cleaner, the rotation speed of the impeller 13 is approximately 20. It rotates at a high speed of ○○ Or pm to 40.00 Or pm. Due to such high speed rotation, the centrifugal force is also large, and centrifugal force acts on the blades 17 fd and in the radial direction of the impeller 13. The dog part of the blade 170 is caulked by the caulking part 19, so it has a reinforcing effect and will not be deformed by centrifugal force. Since it is inserted into the claw stopper hole 23 provided in the sealoud 18, it has the effect of supporting the centrifugal force applied to the blade here.

If you pay attention to the claw-like protrusion 22 and the claw-holding hole 23,
Since the claw-like protrusion 22 is simply inserted into the claw-holding hole 23, a gap is created.

Since the electric blower according to the embodiment of the present invention is for use in a vacuum cleaner, the flow rate of air sent by this blower is approximately 1. o
m3. It is approximately 2 mJ/mzn. Furthermore, since the diameter of the suction port 29 is approximately 36 in., the flow velocity of the airflow passing through the suction port 29 in the axial direction is approximately 20 m/s to 35 m/s.

The airflow that has passed through the suction port 29 in the axial direction flows along the conical inlet guide 26, and is deflected in the direction perpendicular to the axis 12 within the impeller 13, but the airflow passes through the suction port 29. Since the flow velocity is as high as described above, the flow cannot be changed in the direction perpendicular to the axis and flows toward the gap created between the claw-like protrusion 22 and the claw stopper hole 23 (/7C), causing leakage. However, in the electric blower according to the embodiment of the present invention, cJ5,
Since a washer 25 having an outer diameter that covers the portion where the claw-like projection 22 is inserted into the rear searoud 18 is provided, the leakage flow is stopped here, and as a result, there is an effect of increasing air blowing efficiency.

FIG. 7 and subsequent figures show still other embodiments.

In Figures 7 to 13, is the claw-like protrusion 32 a claw-holding hole? 3
3 and enters into a pawl escape groove 35 formed by a recess provided in the washer 34 to be stopped. The rest of the configuration is the same as the configuration shown in FIG. 2, so a description thereof will be omitted here.

The operation in this embodiment is as follows.

The force due to the radial centrifugal force that is applied to the blades 37 when the impeller 36 rotates is absorbed by the claw-like protrusions 32
Since it is supported by the rear shroud 38 of No. 6 and the washer 34, it can be supported reliably.

At the same time, the washer 34 also has the effect of stopping leakage from the claw stopper hole 33.

Effects of the Invention As is clear from the above-mentioned embodiments, the electric blower for a vacuum cleaner of the present invention is provided with claw-like protrusions on the blades of the impeller, in contact with the surface of the rear shroud of the impeller on the side opposite to the blades. By providing a washer that covers the claw-like protrusion, the mounting strength of the plate is increased, the instability of the blade is eliminated, and the flow from the claw fixing hole is blocked, which improves the stability of air blowing performance and air blowing. The effect is improved efficiency.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main parts of a conventional electric blower for a vacuum cleaner.
Fig. 2 is a sectional view of essential parts of an electric blower for a vacuum cleaner showing an embodiment of the present invention, Fig. 3 is a plan view of the impeller of the blower seen from the suction port, Fig. 4 is a sectional view of the same, and Fig. 5 The figure is a plan view of the rear searoud of the same impeller viewed from the motor side, Figure 6 is a developed view of the blades, Figure 7 is a sectional view of main parts of an electric blower for a vacuum cleaner showing another embodiment of the present invention, Figure 8 is a plan view of the impeller of the blower viewed from the suction port, Figure 9 is a plan view of the same location, Figure 10 is a plan view of the rear shroud of the same impeller viewed from the motor side, and Figure 11 is the unfolded blade. 12 is a plan view of the washer not shown in FIG. 7 as seen from the impeller J11, and FIG. 13 is a sectional view of the washer. 17 , 37 , blade, 18. 38 rear shikoroud, 20 suction port, 22 , 32 claw-like projection, 25.
34. ・Washa, 35 Washa's 4th part 1, Name of agent: Patent attorney Toshio Nakao Haga 1st person
1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 7 Figure 9 Figure 10 Figure 111 fig, 12 Figure 13 s34 Exp =. Yu product

Claims (2)

[Claims] (1) An impeller is constructed from a front sealoud, a plurality of plates, and a rear noloud. A claw-like projection is provided at the suction end of the blade on the rear side of the blade, and the claw-like projection is inserted into the rear sealoud. The above-mentioned ? An electric blower for vacuum cleaners that is equipped with a onesie that covers the insertion part of the protrusion into the rear side. (2) The electric blower for a vacuum cleaner according to claim 1, wherein the washer is provided with a recess into which a portion of the claw-like projection provided on the blade passes through the rear surface/corrode.