JPS63215897A - Electric blower - Google Patents

Abstract

PURPOSE:To make an air flow out of a suction port smoothly inducible to an air guide, by making the diameter of a front fan blade of a fan unit of a blower for a vacuum cleaner or the like larger than that of a rear fan blade, and beinding the outer circumferential part so as to be situated at an interspace with a blade outer end. CONSTITUTION:An electric blower available for a vacuum cleaner attaches a fan unit 26 tight to the tip of a turning shaft 24 of an electric motor in a bracket 23 at the counter load side. A fan unit 26 is constituted of an umbrella type front fan plate 27, an almost flat form rear fan plate 29 and plural blades 28 solidly formed in an inner surface of the front fan plate 27. In this case, a suction port 27a is formed in the central part of the front fan plate 27, while an inner diameter of an outer circumferential part 27b of the front fan plate 27 is made larger than an outer diameter of the rear fan plate 29, and the outer circumferential part 27b is made so as to be bent to the side of the rear fan plate in order to be situated at an interspace with an outer end of the blade 28.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electric blower used in a vacuum cleaner or the like.

Conventional technology In recent years, f! ! Dynamic air blowers are used in a wide range of fields, including home appliances such as 1E vacuum cleaners, and efforts are being made to reduce the number of parts, improve productivity, and reduce costs.

The conventional 1fLJtl+ air blower will be explained below.

FIG. 6 is a partially cutaway side view of a conventional electric blower used in a vacuum cleaner. It is formed. Built into the anti-load side bracket 8
A rotating shaft 4 from an electric motor (not shown) projects toward the load-side bracket 2 and is supported by a bearing 5 on the load-side bracket 2 . A nut 51 and a trowel fan unit 7 are fixed to the tip of the rotating shaft 4.

An air guide 8 is attached to face the outer periphery and lower part of the fan unit 7, and a casing 9 covers the front (intake side) of the fan unit 7.In the center of the casing 9, the fan unit 7 is mounted. An intake port 9a is opened facing the suction lower a, and an exhaust port 8a is opened in the anti-load side bracket 3.The fan unit 7 is a plurality of fan units made of a flat metal material such as aluminum. The fan blades 10 are arranged between the front fan brake 11 and the rear fan plate 12, and are integrated by caulking or the like. The air flow A8% from the suction lower a is opened so as to come out from the fan unit outer peripheral end 7b, which is the outer peripheral part of the front fan plate 11 and rear fan brake 12. To fix the fan unit 7 to the tip E of the rotating shaft 4, first fit the spacer 18 onto the rotating shaft 4, then fit the rear fan plate 12 sandwiched between the pair of washers 14 and 15, and then fit the spacer 16. This is done by tightening the nut 6. Note that the outer circumferential portion 9b of the casing 9 is press-fitted into the outer circumferential portion 2a of the load-side bracket 2.

The operation of the electric blower 1 configured as described above will be described below.

First, by energizing the electric blower 1, the fan unit 7 is rotated. Then, air is sucked in from the intake port 9a of the casing 9, and this air flows from the suction lower a of the fan unit 7 to the outer peripheral end 7b of the casing 9.
After passing through the air guide 8, the air is discharged from the exhaust port 8a of the bracket 8 on the opposite load side.

Problems to be Solved by the Invention However, in the above conventional configuration, the fan unit 7
The casing 9 is connected to the fan unit 7 in order to smoothly guide the air flow that is taken in from the suction lower a and discharged from the outer peripheral end 7b to the air guide 8 without any interference.
and arranged to cover the air guide 8,
The outer circumferential portion 9b is press-fitted into the outer circumferential portion 2a of the load-side bracket 2 and fixed therein. In other words, the casing 9 is required to allow the airflow A to flow smoothly without leakage, leading to an increase in the number of two parts, an increase in production man-hours, and an increase in cost.

The present invention solves the above-mentioned conventional problems.

Airflow flowing in from the fan unit's intake port.

Without using a casing (allowing air to flow through the air guide), reducing the number of parts and improving productivity.

The purpose is to provide an electric blower that can reduce costs.

Means for Solving the Problems In order to achieve this object, the electric blower of the present invention includes a fan unit in which the front and rear of a plurality of blades are covered with a front fan plate and a rear fan plate, and a fan unit in which air is blown out from the fan unit. The fan unit includes an air guide for rectifying air and an electric motor for driving a fan unit, and the front fan plate of the fan unit has a larger diameter than the rear fan plate.

Bend the outer periphery toward the rear fan plate so that it is spaced apart from the outer end of the blade.

An intake port is formed in the center.

Effect: With this configuration, the air flowing in from the intake port of the front fan plate is guided by the outer periphery of the front fin plate and flows smoothly into the air guide without leaking.

Conventionally, there is no need to use a T2 casing, which is arranged to cover the front fan plate.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 4.

FIG. 1 shows an electric blower used in a vacuum cleaner according to an embodiment of the present invention, and the outer shell of the electric blower 21 is
It is formed by a load-side bracket 22 and a counter-load-side bracket 28 that houses a fan unit driving electric motor (not shown) and the like. A rotating shaft 24 from the power supply 12Its projects toward the load-side bracket 22, and is supported by a bearing 25 on the load-side bracket 22. Further, the tip end of the rotating shaft 24 is formed into a small diameter shaft portion 24A for fixing the fan unit 26.

The anti-load side bracket 23 has an open exhaust port 28a and is provided with a brush portion 21b. 1 to 8, reference numeral 27 is an umbrella-shaped front fan plate made of a resin material, which has an air intake port 27a formed in the center and an outer peripheral portion 27b formed approximately parallel to the rotating shaft 24. A plurality of blades 28 are integrally arranged on the inner surface. Reference numeral 29 denotes a substantially flat rear fan plate made of a resin material, and includes an outer peripheral portion 27 of the front fan plate 27.
Make the outer diameter smaller than the inner diameter D1 of b.

In other words, as a relationship >D, an opening 85 is formed between the inner diameter DI and outer diameter D2, and a boss portion 29a for fixing with the rotation @24 is provided in the center for intake air. It is formed to protrude toward the mouth 27a side.

The tip of this boss portion 29a is formed into a substantially spherical shape,
Further, a recess 29b is formed on the inner surface for press-fitting and fixing the small diameter shaft portion 24A. The rear fan plate 29 is fixed to the inner end surface 28a of the blades 28 integrally arranged in the eight-part fan plate 27 by welding or the like, and at this time the rear fan plate 29 is in a position built into the surface fan plate 27.

The front fan plate 27, the blades 28, and the rear fan plate 29 constitute the fan unit 26. The load side bracket 22 and the fan unit 26 are arranged so as to cover the outer circumference 27b of the front fan plate 27.
An air guide 30 for rectifying the air sent out from the fan unit 26 is disposed between them, and this air guide 30 is fixed to the load side bracket 22. Here, the inner diameter D4 of the air guide 30 facing the outer circumferential portion 27b is made larger than the outer diameter D3 of the outer circumferential portion 27b, that is, the relationship D4>DJ is established to enable rotation of the fan unit 26. A spacer 81 is fitted around the rotating shaft 24 and disposed between the rear fan plate 29 and the bearing 25. As shown in FIG. 4, a vibration isolator 32 made of an elastic material is arranged over the outer periphery of the air guide 80 and the load side bracket 22, and a vibration isolator made of an elastic material is placed behind the anti-load side bracket 23. By arranging the material 88, the electric blower 2
1 is incorporated into the vacuum cleaner main body 84. B indicates airflow.

The operation of the electric blower of this embodiment configured as described above will be explained below. First, turn on the power, 1 rotation 011
24, the fan unit 26 starts rotating, and air is taken in from the intake port 27a of the front fan plate 27. The airflow B then passes through the blades 28 and is directed through the inward opening θ formed between the inner diameter D4 of the outer circumference 27b of the front fan plate 27 and the outer diameter D3 of the rear fan plate 29.
5 through air guide 80.

The air will be exhausted from the exhaust port 28a. In other words, the front fan plate 27, the blades 28, and the rear fan plate 29 made of resin material guide the air flow B to the air guide 80 without leaking to the outside. The casing that was previously installed is no longer needed. Furthermore, the fan unit 26 can be attached to the rotating shaft 24 by directly fixing the concave portion 29b of the boss portion 29a formed on the rear fan plate 29 to the small diameter shaft portion 24A of the rotating shaft 24 by press fitting. There is no need for parts such as nuts for this purpose (therefore, the number of parts can be reduced, productivity can be improved, and costs can be reduced).

Furthermore, by forming the tip of the boss portion 29b into a substantially spherical shape and by forming the inner surface of the front fan plate 27 smoothly, the airflow B does not stagnate inside the fan unit 26 or generate turbulence. Since the air flows more smoothly, the performance of the electric blower 21 can also be improved.

As shown in the above embodiment, since the fan unit 26 can be fixed by being press-fitted onto the rotating shaft 24 through the boss portion 29a formed on the rear fan plate 29, nuts, etc. for fixing the fan unit 26 can be fixed. parts are no longer needed. Furthermore, since the fan unit 26 is manufactured from a resin material, it can be easily obtained at low cost even if it has a complicated shape.

C These things reduce the number of parts, improve productivity,
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Effects of the Invention The present invention provides a method in which the front fan plate of a fan unit is made larger in diameter than the rear fan plate, and its outer circumferential portion is bent toward the rear fan plate so as to be located at an IPjj distance from the outer ends of the blades. By forming an intake port in the center, the airflow flowing in from the intake port of the front fan plate is guided by the outer periphery of the front fan plate and smoothly guided to the air guide without leaking. This makes it possible to omit the casing that covers the entire fan unit, which was conventionally provided to prevent air leakage. By doing so, it is possible to reduce the number of parts, improve productivity, and reduce costs.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of an electric blower used in a vacuum cleaner according to Embodiment 1 of the present invention, Fig. 2 is a longitudinal sectional side view of the fan unit, and Fig. 3 is a side view of the fan unit. 4 is a side view of the electric blower assembled into a vacuum cleaner body, and FIG. 5 is a partially cutaway side view of the electric blower used in a conventional vacuum cleaner. DESCRIPTION OF SYMBOLS 21... Electric blower, 22... Load side pocket, 28... Anti-load side bracket, 28a... Exhaust port, 24... Rotating shaft, 24A... Small diameter shaft portion, 26...
・Fan unit, 27...Front fan play), 2
7a...Intake port, 27b...Outer periphery, 28...Blade, 28a...Inner end surface, 29...Rear fan plate, 27a...Boss portion, 29b...Concave portion, 30...・
- Air guide, 84... Vacuum cleaner body, 85... Opening, B... Air flow. Dl...Inner diameter of the outer circumference, D...Outer diameter of the rear fan plate. D3... Outer diameter of outer circumference, DJ... Inner diameter of air guide. Fig. 1 2'1p-77S 2 knee J ZB-III
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Claims (1)

[Claims] 1. The above-mentioned fan is equipped with a fan unit in which the front and rear of a plurality of blades are covered with a front fan plate and a rear fan plate, an air guide that rectifies the air sent out from this fan unit, and an electric motor for driving the fan unit. The front fan plate of the unit has a larger diameter than the rear fan plate, and its outer periphery is bent toward the rear fan plate so as to be spaced apart from the outer edge of the blade, and an intake port is formed in the center. electric blower.