CN1077246C

CN1077246C - Electric blowing machine

Info

Publication number: CN1077246C
Application number: CN95103955A
Authority: CN
Inventors: 立石志朗; 山口明; 嶋崎哲夫
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 1994-06-06
Filing date: 1995-04-13
Publication date: 2002-01-02
Anticipated expiration: 2015-04-13
Also published as: JPH07332294A; CN1118845A

Abstract

The invention relates to electric blower including stator, rotor, supporting casing of containing stator and supporting casing of keeping stator bearing housing, rolling fan, air guide part and fan cover, a thin-walled dip part, protruding toward the center along the bottom part of the outer peripheral groove of the bearing pedestal, at the nearly center part of the air guide, and bringing this dip part into close contact with the bottom part of the outer peripheral groove of the bearing housing when fixing the air guide part to supporting casing, hereby having the effect of ensuring air obturate, improving air intaking capability, and reaching stabilization, and further improving assemble capability.

Description

Electric blowing machine

The present invention relates to be used for the electric blowing machine of vacuum cleaner etc.

In the past, this type of electric blowing machine made the fan high speed rotating, with air guide structure the high-speed air of discharging from fan was imported in the support housing, and motor cooling back is discharged.Yet, because the structure of this guide member is the central part at this air guide structure to be formed endoporus and the bearing support of support housing is inserted in this hole, so between endoporus and bearing support, will produce the gap, air can be let out from one side leakage of motor one side direction fan through this gap, thereby cause that air pressure descends, and characteristic is descended.

Be head it off, Japan Patent is real to be opened clear 60-No. 194191, and proposed on special fair 4-No. 183996 communiques form protrusion on the inner hole surface of air guide structure, make with the bearing support peripheral part between contact the technological scheme of fixing closely.

Yet, in this conventional construction, exist owing to the air guide structure molding condition, it is inconsistent to produce error on endoporus protrusion internal diameter size and bearing support outside dimension, still can produce the problem in gap, and, if reliably be adjacent to and adopt and on inner hole surface, form thin-walled portion otherwise form, make it and the bearing support peripheral part between closely chimeric, with the structure of guaranteeing to be adjacent to, with air guide structure when bearing support inserts, have the assembling performance problem that causes because of chimeric size.

Therefore, the present invention is just in order to solve the above problems, its purpose is to provide to guarantee to be adjacent between air guide structure endoporus portion and bearing support with easier method and prevents to blow characteristic decline, can make the electric blowing machine of the assembling performance raising of air guide structure simultaneously.

According to electric blowing machine of the present invention for addressing the above problem, in the substantial middle portion of air guide structure, form the thin wall shape rake that stretches out along the rake limit inclined side of bearing support circumferential groove gradually towards central part, when the bearing support circumferential groove bottom that makes this rake and upside support housing contacts, and when being fastened on air guide structure on the support housing, making above-mentioned thin wall shape rake and box-like bearing support circumferential groove bottom form closely contact and fix with mounting screw.

The present invention closely contacts by the thin wall shape rake is formed with bearing support circumferential groove bottom as mentioned above, can not only guarantee reliably to be adjacent to, and also can carry out the insertion of air guide structure etc. easily, thereby assembling performance is improved, and then can assemble automatically.

Simple declaration to accompanying drawing:

Fig. 1 is the vertical half sectional view of expression one embodiment of the invention electric blowing machine,

Fig. 2 is for amplifying the figure that analyses and observe the pith of part in the presentation graphs 1.

Fig. 3 is the partial enlarged drawing of expression electric blowing machine air guide structure of the present invention.

Below, with reference to accompanying drawing one embodiment of the invention is described.

Fig. 1 is the vertical half sectional view of expression embodiment of the invention electric blowing machine structure, and Fig. 2 is the major component enlarged view of the vertical half-sectional view of the embodiment of the invention, and Fig. 3 is the partial enlarged drawing of guide member in the embodiment of the invention.

Among Fig. 1-3,1 is stator, and 2 is rotor, 3 expression downside support housings, and on the end opening edge of the cylindrical part 3a of the rotor 2 that keeps being configured in stator 1 inboard, be formed with the planar surface portion 3b that stretches out to this cylindrical part 3a outside.The planar surface portion 3b that 4 expressions are fixed on downside support housing 3 goes up and the upside support housing that an end opening of downside support housing 3 is topped, has bearing support 4a and the circumferential groove 4b on the periphery of bearing support 4a with the bearing 2a supporting maintenance of rotor 2.

5 expressions are by plastic air guide structure, form rake along the circumferential groove 4b of bearing support 4a when the thin wall shape rake 5a that central part tilts to stretch out gradually is fixed on thin wall shape rake 5a on the upside support housing with mounting screw 6 in its substantial middle portion, present this rake 5a closely is crimped on state on the bottom of circumferential groove 4b of box-like bearing support 4a.

7 for being configured in the outside of air guide structure 5, be fixed in the rotary fan on the rotor shaft 2b of rotor 2, portion has intakeport 7a in the central, has exhaust port 7b on the peripheral part, and 8 is to be installed in the end opening side covering air guide structure 5 of downside support housing 3 and the fan guard of rotary fan 7.

Below, action of the electric blowing machine of above-mentioned structure and assembling performance are described.

Earlier its action is described.At first, when making electric blowing machine connect power supply, make stator 1 and make rotor 2 energisings by brush, rotor 2 rotates by rotor 2 with high speed rotating, and the high speed rotating that is fixed in the fan 7 on the 2b, from the suction port 8a suction air of fan cover 8.Then, inhaled air is discharged through air guide structure 5 importing downside support housings 3 inside from floss hole 7b by the intakeport 7a of rotary fan 7, thereby one side is cooled off stator 1 and rotor 2 one sides are discharged to the outside.

Because the high-pressure air that imports air guide structure 5 inside is guaranteed tightness between itself and circumferential groove 4b because of the rake 5a of air guide structure 5, the air of downside support housing 3 inside is not let out to fan 7 one side leakages, and can be with high-pressure air side bearing housing 3 inner guiding downwards smoothly.Therefore, can prevent the decreased performance that descends and to cause because of air pressure.

Next, assembling performance is described, because its structure is not chimericly between the thin wall shape rake 5a of the peripheral part of the bearing support 4a by upside support housing 4 and air guide structure 5 to guarantee tightness, thereby do not need to carry out the intercalation of air guide structure 5, thereby assembling easily, thereby can improve assembling performance.

According to the present invention as described hereinbefore, form the thin wall shape rake that tilts to stretch out gradually to central part along the rake of bearing support circumferential groove by substantial middle portion at air guide structure, when the box-like bearing support circumferential groove bottom that makes described thin wall shape rake and upside support housing contacts, and when being fixed on air guide structure on the upside support housing with mounting screw, make above-mentioned thin wall shape rake and box-like bearing support circumferential groove bottom form tight face contact, can guarantee tightness thereby provide, make the air suction performance improve the electric blowing machine of stable performance.

In addition, owing to do not need as in the past, to set the size of air guide structure endoporus portion and bearing support peripheral part for consider chimeric size,, the assembling performance is improved so can assemble easily from tightness.

Claims

1. electric blowing machine comprises stator; Be configured in the rotor of said stator inboard; Hold the downside support housing that forms the planar surface portion of stretching out on the cylindrical part one end opening edge of above-mentioned rotor at it to this cylindrical part outside; Have the bearing support that maintains for above-mentioned rotor, be fixed on the planar surface portion of above-mentioned downside support housing, cover the upside support housing of an end opening portion of above-mentioned downside support housing; Be fixed in the rotary fan on the above-mentioned rotor shaft; The air guide structure that the air of discharging from said fans is guided in above-mentioned downside support housing; Be installed on the end opening side of above-mentioned downside support housing, cover the fan guard of above-mentioned air guide structure and fan, it is characterized in that, on the central position of above-mentioned air guide structure, form the thin wall shape rake that tilts to stretch out to central part, described rake is formed with above-mentioned box-like bearing support circumferential groove bottom closely contact.

2. gas fan according to claim 1, it is characterized in that making above-mentioned rake towards central part gradually along the rake face tilt of bearing support circumferential groove.

3. gas fan according to claim 1, thus it is characterized in that by making described rake and the formation of box-like bearing support circumferential groove bottom closely contact fixing tightening up for the mounting screw that is maintained fixed air guide structure.