JP2002200016A - Vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum cleaner whose dust collecting bag can be improved in dust collecting performance. SOLUTION: An electric blower 3 and a blower chamber 2c are housed in the main body 2 of this vacuum cleaner and a dust collecting bag 4 to collect sucked dust is housed in a dust collecting chamber 2a of the main body 2. A bag receiving wall 15 to support the bottom part of the dust collecting bag 4 is placed in the dust collecting chamber 2a. The bag receiving wall 15 is formed of an impervious material. Ventilating parts 16 are equipped on the periphery part of the bag receiving wall 15 to communicate a gap B for air suction equipped in between the outer periphery face 4a to the bottom side of the dust collecting bag 4 and the inner face of the dust collecting bag and the suction port 3a of the electric blower 3 through the ventilating parts 16. Thereby the whole part of the dust collecting bag 4 is made easily inflated by a sucked air flow and the sucked air flow is passed mainly through the rear side periphery part of the bag 4 to catch dust by the periphery part of the dust collecting bag 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vacuum cleaner for cleaning by capturing dust sucked by a suction force of an electric blower in a dust collecting bag in a dust collecting chamber.

[0002]

2. Description of the Related Art In a conventional vacuum cleaner which uses a dust collecting bag as a filter for separating and capturing sucked dust from an intake air flow, a dust collecting chamber is provided upstream of a blower room in which an electric blower is accommodated. The dust collection chamber accommodates a dust collection bag so that it can be taken in and out. In the event that the dust bag is damaged, a protective member having better air permeability than the dust bag is provided to prevent large dust that may cause a failure of the electric blower to be sucked into the electric blower. ing.

As the protective member, a grid having a coarse mesh, a filter, or a combination of such a grid and a filter is used. The protective member is disposed between the dust bag and the electric blower such that the bottom of the dust bag contacts the bottom, and the peripheral portion of the protective member has no air permeability for its attachment. I have.

When the electric blower is operated, the bottom of the dust bag is attached to the protective member by being sucked to the protective member. In this state, the non-breathable peripheral portion of the protective member prevents the intake air flow from passing through the bottom peripheral surface of the dust collection bag, while the intake air flow restricts the dust collection bag facing the central portion of the protective member. Pass mainly through the center of the bottom surface. for that reason,
Combined with the fact that the entire dust collection bag is unlikely to swell, the dust that is captured by the dust collection bag and accumulates inside it is concentrated and accumulated at the bottom center of the dust collection bag. Dust tends to cause the central portion of the bottom surface of the dust collecting bag to be clogged at an early stage, and dust collection in the dust collecting bag tends to be remarkably reduced in spite of the possibility of further collecting dust in terms of volume.

[0005] As described above, in the conventional configuration, the dust collecting performance on the peripheral side of the dust collecting bag is low, and the dust collecting bag is easily clogged at an early stage. Collection efficiency is not good. As a result, the dust bag has to be replaced even though the dust is not sufficiently clogged.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a vacuum cleaner capable of improving dust collecting performance in a dust bag.

[0007]

According to the present invention, there is provided a cleaner body having a blower chamber, a dust collecting chamber provided upstream of the blower chamber, and a dust collecting chamber lid for opening and closing an opening of the dust collecting chamber. It is assumed that an electric vacuum cleaner includes an electric blower housed in the blower room and a dust collecting bag housed in the dust collecting chamber so as to be able to be taken in and out through the opening.

In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that the bag receiving wall which is impermeable or less permeable than the dust collecting bag is supported so as to support a part of the dust collecting bag. Along with being provided in the cleaner body, a suction gap is provided between the outer peripheral surface of the dust collecting bag and the inner surface of the dust collecting chamber,
The air gap and the air inlet of the electric blower are communicated with each other through a vent provided on a peripheral side of the bag receiving wall.

The invention of claim 1 is applicable to various types of vacuum cleaners such as a canister type, an upright type and a handy type. Further, in the invention of claim 1, the bag receiving wall may be provided integrally with the cleaner main body, or a separately formed one may be attached to the cleaner main body, and the ventilation portion is provided around the bag receiving wall. Or it may be provided between the peripheral portion of the bag receiving wall and the inner surface of the dust collecting chamber. In the first aspect of the present invention, the intake air gap may be provided by setting up a rib on the inner surface of the dust collecting chamber to restrict the expansion of the dust collecting bag, or the dust collecting bag itself may be maximized. It may be ensured by adopting a configuration capable of regulating its own expansion shape so that the air intake space remains in the dust collection chamber when expanded.

According to the first aspect of the present invention, since a part of the dust collecting bag is supported by the bag receiving wall which is not air permeable or has a lower air permeability than the dust collecting bag, the intake air may pass through the bag receiving wall. It can be low, even if it is obstructed or passed through. Therefore, a part of the dust collection bag is stuck to the bag receiving wall by the wind pressure of the intake flow, and the intake flow trying to pass through the dust collection bag is guided mainly along the bag receiving wall, and is positioned in this flow direction. Through the partial peripheral surface of the dust bag
The air can flow out to the intake gap provided outside the peripheral surface. Then, the intake air flowing through the dust collection bag is sucked into the electric blower through the ventilation section communicating with the intake gap. In addition, as described above, a part of the intake air flowing through the dust bag is reflected by a part of the dust bag attached to the bag receiving wall. After flowing along the inner surface of the dust bag, a vortex is formed that reverses toward the center of the dust bag, and the vortex can greatly expand the entire dust bag.

According to a second aspect of the present invention, the ventilation portion is formed in a peripheral portion of the bag receiving wall according to the first aspect of the present invention, and a stopper means for preventing suction of the dust bag into the ventilation portion is provided. It is characterized by:

In the second aspect of the present invention, the stopper means includes a grid-like rib or one or more ribs provided in the ventilation portion.
Alternatively, in addition to a filter fitted into the ventilation portion and having better air permeability than the dust bag, the rib may be formed in combination with the filter. In addition, instead of providing the stopper means on the bag receiving wall, the stopper means is, for example, integrally protruded from the inner surface of the cleaner body and enters the ventilation part, or intersects with the passage direction of the intake air flow to the ventilation part to the ventilation part. It can also be formed by a rib or a comb-like portion provided so as to cover this so as to overlap.

According to the second aspect of the present invention, the rear portion of the inflated dust bag is prevented by the stopper means from deeply entering the ventilation section due to the force of the intake air flowing through the ventilation section and being sucked into the electric blower. The dust bag can be prevented from being caught on the bag receiving wall.

According to a third aspect of the present invention, the bag contacting surface of the bag receiving wall according to the first or second aspect of the present invention is arranged such that a portion of the dust collecting chamber where the dust collecting bag is accommodated is a cover of the dust collecting chamber. It is characterized by being inclined so that it spreads as it approaches.

According to the third aspect of the present invention, when the dust bag is opened and the dust bag is taken out of the dust collecting chamber, the dust bag gradually moves from the bag contact surface of the bag receiving wall as the bag is taken out. Because of the separation, the resistance of the bag receiving wall to the removal can be gradually reduced.

According to a fourth aspect of the present invention, the bag receiving wall according to the first or second aspect has a ridge extending at a center thereof in a direction in which the dust bag is taken in and out, and both sides of the ridge. The bag receiving wall has a slanted surface inclined in opposite directions so as to gradually move away from the dust collecting bag, and the bag contacting surface of the bag receiving wall is substantially V-shaped.

According to the fourth aspect of the present invention, since the intake air flowing through the dust collecting bag is guided mainly along the inclined surface of the bag receiving wall, the suction flow passes through the bag from the inside of the dust collecting bag. The power of the intake air can be prevented from being greatly killed.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a perspective view showing the entirety of a canister-type air non-circulating vacuum cleaner. The vacuum cleaner 1 has a cleaner body 2 having wheels that can freely move on a floor, and an electric blower. 3, a dust collecting bag 4, a dust suction hose 5, an extension pipe 6, a suction port 7, a cord reel 8, and the like.

The cleaner main body 2 has an openable and closable dust collection chamber lid 2a which forms, for example, a front upper surface thereof. As shown in FIG. 2, inside the cleaner body 2, a dust collection chamber 2 b facing right below the dust collection chamber lid 2 a is provided, and a rear side of the dust collection chamber 2 b, in other words, A blower room 2c and a code reel room 2d are provided on the downstream side of the dust collection room 2b based on the intake air flow.

The dust collecting chamber 2b, the blower room 2c and the code reel room 2d are separated by the first partition wall 11 of the cleaner body 2, and the blower room 2c and the code reel room 2d are similarly formed by the first partition wall 11 of the cleaner body 2. It is partitioned by two partition walls 12. The first partition wall 11 is provided with a ventilation hole 11a. In the blower room 2c, an electric blower 3 is provided with an air inlet 3a through a vent hole 11.
The cleaner body 2 has an exhaust port (not shown) that communicates with the inside and outside of the blower room 2c. The code reel chamber 2d houses a code reel 8 on which a power cord for supplying power to the electric blower 3 is wound up so as to be able to be fed out.

The dust collection chamber lid 2a is rotatable via a pivot (not shown) on the rear side, and with the rotation, opens and closes the upper opening of the dust collection chamber 2b located upstream of the blower chamber 2c. . At the front end of the cleaner main body 2, for example, a dust suction port 13 is provided substantially horizontally, and one end of the dust suction hose 5 on the cleaner main body side is detachably connected to the dust suction port 13. Has become.

The dust suction hose 5 and the extension pipe 6 form a suction pipe for communicating the dust collection chamber 2b with the suction port 7, and the dust suction hose 5 has a handle 5a with a hand-operated switch at the other end. Have. One end of a hard extension tube 6 is detachably connected to the handle 5a.
The suction port 7 is detachably connected to the other end.

In the dust collecting chamber 2b, a bag receiving wall 15 as a bag support is arranged near the first partition wall 11.
The receiving wall 15 is provided so as to partition the rear portion (the blower chamber 2b side) of the dust collecting chamber 2b by fitting both side edges and a lower edge into mounting grooves 2e provided on the inner surface of the dust collecting chamber 2b. An air gap A is formed facing the one partition wall 11 and communicating with the ventilation port 11a between the partition wall 11 and the wall 11. A substantially central portion of the bag receiving wall 15 is located on an extension of the central axis of the dust suction port 13.

The bag receiving wall 15 supports a portion, for example, a bottom portion of the dust collecting bag 4 which is housed in an interior portion of the dust collecting chamber 2b located on the upstream side thereof so as to be able to be taken in and out through its upper surface opening. . The bag receiving wall 15 is formed of, for example, a substantially rectangular plate made of a synthetic resin material, and is non-breathable itself. However, as shown in FIG. Have. In the present embodiment, the ventilation portions 16 are provided on each side of the bag receiving wall 15, and the ventilation portions 16 are provided with ribs 17 as stopper means. When the dust collection chamber lid 2a is closed, a not-shown holding protrusion provided on the inner surface of the lid 2a in correspondence with the bag receiving wall 15 comes into slight contact with the upper side of the bag receiving wall 15. I have. A large number of ribs 17 are arranged, for example, in a comb shape.
The rear part is provided in order to prevent a large suction and a deep penetration. The ribs 17 are provided on the bag receiving wall 15.
Since it is formed integrally with the above, there is no need for a separate part as the stopper means, and it is excellent in that it is provided simply and at low cost.

The bag receiving wall 15 may be the one shown in FIG. The bag receiver 15 is made of a non-breathable material, and has a recessed portion 1 around the periphery of the bag receiving wall 15.
6 are provided, and the filter 18 is fitted to these ventilation portions 16 as stopper means. Filter 18
Urethane foam or the like having a coarse mesh and higher air permeability than the dust bag 4 is used.

The air-permeable bag portion of the dust bag 4 is made of paper or cloth. In this embodiment, a disposable paper bag is used as the dust bag 4. The dust collecting bag 4 is configured to maintain a size such that the rear peripheral surface does not particularly come into contact with the inner surface of the dust collecting chamber 2b even when the bag portion is swollen to the maximum. By using such a dust collecting bag 4, as shown in FIG. 2, in a state where the dust collecting bag 4 is maximally expanded, the dust collecting bag 4 surrounding the bottom side outer peripheral surface 4a of the dust collecting bag 4 and this portion are formed. A space B for intake is secured between the inner surface of the chamber 2b and the inner surface of the chamber 2b. The intake air gap B communicates with the air gap A through the ventilation section 16.

In the electric vacuum cleaner 1 having the above-described structure, the electric blower 3 is driven to suck the dust on the surface to be cleaned from the suction opening 7 by the air blown by the electric blower 3, and the extension pipe 6 and The dust is guided to the dust collecting chamber 2b of the cleaner main body 2 via the dust suction hose 5, and the dust can be captured by the dust collecting bag 4 in the chamber 2b. Then, the air (intake flow) passing through the dust bag 4 is sucked into the electric blower 3 and passes through the blower 3.
Through the exhaust port (not shown) of the cleaner body 2, the cleaner body 2
Is discharged to the outside. Thus, the surface to be cleaned can be cleaned.

In such cleaning, the bottom surface 4b of the dust bag 4 is impermeable by the wind pressure of the intake air introduced into the dust bag 4 through the dust suction hose 5 inserted and connected to the dust suction port 13. It is pressed against the front surface (bag contact surface) 15a of the bag receiving wall 15 and is adhered along the wall 15, and at the same time, the suction flow is prevented from passing through the bottom surface 4b of the dust collecting bag 4 and the bag receiving wall 15.

Along with this, the intake air flow whose bottom surface 4b is going to pass through the dust bag 4 supported by the bag receiving wall 15 is omnidirectionally guided mainly along the bag contact surface 15a of the bag receiving wall 15. Therefore, the suction flow is passed through the bottom peripheral surface 4a of the dust bag 4 located in the flow direction.
The suction air flowing through the dust collection bag 4 in this way is sucked into the electric blower 3 through the gap A communicating with the suction gap B via the ventilation section 16. In FIG. 2, the flow of the air (the intake air flow) sucked into the electric blower 3 as described above is indicated by the solid arrow.

Moreover, in this case, a part of the intake air flowing through the dust collecting bag 4 is reflected by the bottom surface 4b of the dust collecting bag 4 which is attached to and supported by the bag receiving wall 15. Based on this, in the dust collection bag 4, a vortex (indicated by a dotted arrow in FIG. 2) that flows along the inner surface of the peripheral portion of the bag 4 and then reverses toward the center of the dust collection bag 4. ) Is formed,
This swirl allows the entire dust collecting bag 4 to be greatly inflated.

As described above, while the entire dust collecting bag 4 is largely inflated, the intake air flow is mainly caused by the bottom side peripheral surface 4a of the dust collecting bag 4.
And dust is allowed to flow out to the suction gap B therearound, so that the dust can be captured substantially entirely around the dust collecting bag 4. Therefore, early clogging of the dust collection bag 4 is prevented, and the dust collection performance of the dust collection bag 4 can be improved. Therefore, the frequency of replacement of the dust bag 4 can be reduced.

As described above, the rear portion of the expanded dust collecting bag 4 tends to be drawn into each ventilation portion 16 by the force of the intake air sucked into the electric blower 3. Since each of the ribs 17 is provided, it is possible to prevent the rear portion of the dust collecting bag 4 from entering the ventilation portion 16 deeply by the rib 17. In other words, the rear part of the dust collecting bag 4 can be prevented from being caught by each ventilation part 16. Therefore, when taking out the dust collection bag 4 filled with dust through the opening of the dust collection chamber 2b, the ventilation portion 16 does not easily become a resistance for moving the dust collection bag 4 upward. Can be taken out.

FIGS. 4 and 5 show a second embodiment of the present invention. This embodiment has basically the same configuration as that of the first embodiment. Therefore, the same components as those of the first embodiment are denoted by the same reference numerals, and the description of the configuration and operation is omitted. Will be described. The difference between the second embodiment and the first embodiment is the configuration of the bag receiving wall.

That is, in the second embodiment, as shown in FIG. 5, the bag contacting surface 115a is inclined by increasing the thickness of the bag receiving wall 115 from the upper side to the lower side. Further, the bag receiver 115 is formed of a hard foam material and has air permeability. However, the air permeability of the bag receiver 115 is lower than that of the dust bag 4. The bag receiver 115 may be made of a non-breathable material. The bag receiver 115 is provided with the ventilation portion 16 and the rib 17 only on the upper peripheral portion. The bag receiving wall 115 is positioned between the dust collecting bag 4 and the electric blower 3 as shown in FIG. Are located. Therefore, the accommodating space for accommodating the actual dust collecting bag 4 in the dust collecting chamber is gradually widened as it approaches the dust collecting chamber lid 2a which closes the upper opening of the dust collecting chamber. The configuration other than the points described above is the same as that of the first embodiment, including the configuration not shown in FIGS. 4 and 5.

In the structure of the second embodiment, although the bag receiving wall 115 supporting the rear portion of the dust bag 4 has some air permeability, its air permeability is lower than that of the dust bag 4. Part of the intake air flow is transferred to the bottom of the dust bag 4 and the bag receiving wall 11.
5 so that the bottom surface can be sucked to the bag contact surface 115a. However, most of the intake air flow is
15 can be guided upward along the slope of the bag contact surface 115a, and the suction flow can be discharged to the suction gap B through the bottom-side upper peripheral surface 4a of the dust bag 4 located in the flow direction. Therefore, the same effect as in the first embodiment can be obtained to solve the problem of the present invention.

In addition, due to the inclination of the bag contact surface 115a, the interior of the dust collecting chamber in which the dust collecting bag 4 is accommodated is widened closer to the dust collecting chamber lid 2a, so that the dust collecting chamber lid 2a is opened. When the dust collecting bag 4 is taken out from the dust collecting chamber, the bottom surface of the dust collecting bag 4 gradually moves away from the bag contact surface 115a of the bag receiving wall 115 as the taking out progresses. Accordingly, the resistance of the bag contacting surface 115a to the bottom surface of the dust collecting bag 4 to be taken out through the opening of the dust collecting chamber gradually decreases, so that the dust collecting bag 4 can be easily taken out from the dust collecting room.

FIGS. 6 and 7 show a third embodiment of the present invention. This embodiment has basically the same configuration as that of the first embodiment. Therefore, the same components as those of the first embodiment are denoted by the same reference numerals, and the description of the configuration and operation is omitted. Will be described. The difference between the third embodiment and the first embodiment is the configuration of the bag receiving wall.

That is, in the third embodiment, as shown in FIGS. 6 and 7, the thickness of the bag receiving wall 215 is gradually increased from both ends in the width direction toward the center, thereby forming the bag receiving wall 215 at the center in the width direction. It has a ridge 216 extending in the up and down direction (the direction in which the dust bag 4 is taken in and out), and has slopes 215b on both sides which are inclined in opposite directions so as to gradually move away from the bottom of the dust bag 4. ing. The pair of inclined surfaces 215b form a substantially V-shaped bag contact surface 215a continuously with each other. Further, in the third embodiment, the ventilation portion 16 of the bag receiving wall 215 is formed as a U-shaped recess, but it is a matter of course that stopper means such as a rib may be provided there. The configuration other than the points described above is the same as that of the first embodiment, including the configuration not shown in FIGS. 6 and 7.

In the configuration of the third embodiment, the air-impermeable bag receiving wall 215 supporting the rear portion of the dust collecting bag 4 is disposed between the dust collecting bag 4 and the electric blower 3. Is guided in all directions along the bag bag contact surface 215a, and the bottom side peripheral surface 4a of the dust collection bag 4 located in the flow direction.
Therefore, the same effect as in the first embodiment can be obtained to solve the problem of the present invention.

In addition, since the bag contact surface 215a has a V-shape in plan view protruding toward the bottom surface 4a of the dust bag 4, the main flow of intake air indicated by the solid arrow in FIG. The direction is not changed substantially at a right angle by the contact surface 215a,
It is guided obliquely along the inclined surface 215b. Therefore, the force of the intake air flowing from the inside of the dust collecting bag 4 and passing through the bottom side peripheral surface 4a of the bag 4 is not greatly reduced, and accordingly, the dust is captured on the peripheral side of the dust collecting bag 4. The collection performance can be further improved because the performance is improved. In addition, ridge part 2
Since the protrusion 16 extends in the vertical direction, there is no inconvenience that the removal of the dust bag 4 is prevented by the ridge 216.

The present invention is not restricted to the above embodiments. For example, each of the bag receiving walls 15, 115, 215 disposed on the upstream side of the electric blower 3 has a high specific gravity, whereby a sound insulating material having a sound deadening or sound absorbing property, or a sound absorbing or sound absorbing material having little air permeability. In this case, it is possible to suppress the noise generated by the electric blower 3 from spreading to the dust collection chamber 2b side.

[0043]

The present invention is embodied in the form described above, and has the following effects.

According to the first aspect of the present invention, the intake air which tends to pass through the dust bag partially supported by the bag receiving wall which is impermeable or less permeable than the dust bag is mainly used to collect dust. The air is passed through the partial peripheral surface of the bag, flows out into the surrounding air intake gap, is further sucked into the electric blower from the gap through the ventilation section, and forms a vortex in the dust bag to form the entire dust bag. Is greatly expanded, so that the dust collecting bag can be prevented from being clogged at an early stage, and a vacuum cleaner having excellent dust collecting performance in the dust collecting bag can be provided.

According to the second aspect of the present invention, the stopper prevents the rear portion of the dust collecting bag from entering the ventilation portion deeply so that the dust collecting bag does not catch on the bag receiving wall. The dust bag can be easily removed from the dust chamber.

According to the third aspect of the present invention, the bag contact surface of the bag receiving wall is inclined to gradually reduce the resistance of the bag contact surface to the dust bag to be taken out through the opening of the dust collecting chamber. The dust bag can be easily removed from the dust collection chamber.

According to the fourth aspect of the present invention, the bag contact surface of the bag receiving wall is substantially V-shaped, so that the force of the intake air passing through the bag from the inside of the dust collecting bag is not greatly reduced. In addition, the dust collecting performance of the dust collecting bag is improved, and the collecting performance can be further improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an entire vacuum cleaner according to a first embodiment of the present invention.

FIG. 2 is a schematic plan view showing a vacuum cleaner main body included in the electric vacuum cleaner shown in FIG.

FIGS. 3A and 3B are perspective views showing different examples of a bag receiving wall provided in the vacuum cleaner of FIG. 1;

FIG. 4 is a side view showing a cleaner main body of the electric vacuum cleaner according to a second embodiment of the present invention.

FIG. 5 is a perspective view showing a bag receiving wall provided in the vacuum cleaner in FIG. 4;

FIG. 6 is a schematic plan view showing a vacuum cleaner main body included in a vacuum cleaner according to a third embodiment of the present invention, with a part cut away.

FIG. 7 is an exemplary perspective view showing a bag receiving wall provided in the electric vacuum cleaner in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Vacuum cleaner 2 ... Vacuum cleaner main body 2a ... Dust collection chamber lid 2b ... Dust collection chamber 2c ... Blower room 3 ... Electric blower 3a ... Inlet of an electric blower 4 ... Dust collection bag 4a ... Bottom side circumference of a dust collection bag Surface 4b: Bottom surface of dust collecting bag 13: Dust port of vacuum cleaner body 15, 115, 215: Bag receiving wall 15a, 115a, 215a: Bag contact surface 16: Vent portion 17: Rib (stopper means) 18: Filter (stopper) Means) 215b: sloped surface 216: ridge A: gap B: gap for intake

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Toshinobu Hidaka 43-Horiyamashita, Hadano-shi, Kanagawa F-term in Hadano Plant, Toshiba Tec Corporation (reference) 3B006 BA05 GA00 3B062 AD11

Claims (4)

[Claims] A vacuum cleaner main body having a blower chamber, a dust collection chamber provided upstream of the blower chamber, a dust collection chamber lid for opening and closing an opening of the dust collection chamber, and a vacuum chamber housed in the blower chamber. An electric vacuum cleaner comprising: an electric blower; and a dust collecting bag which is housed in the dust collecting chamber so as to be able to be taken in and out through the opening. Is provided in the cleaner body so as to support a part of the dust collecting bag, and a suction gap is provided between the partial outer peripheral surface of the dust collecting bag and the inner surface of the dust collecting chamber. An electric vacuum cleaner wherein an air inlet of a blower is communicated with a ventilation portion provided on a peripheral side of the bag receiving wall. 2. The electric device according to claim 1, wherein the ventilation portion is formed in a peripheral portion of the bag receiving wall, and stopper means for preventing suction of the dust collecting bag into the ventilation portion is provided. Vacuum cleaner. 3. The bag contacting surface of the bag receiving wall is inclined so that a portion of the dust collecting chamber in which the dust collecting bag is accommodated becomes wider as approaching the dust collecting chamber lid. The vacuum cleaner according to claim 1. 4. The bag receiving wall has a ridge at the center thereof extending in a direction in which the dust bag is put in and out,
The sloping portion has slanted surfaces on opposite sides of the raised portion which are inclined in opposite directions so as to gradually move away from the dust collecting bag, and the bag contacting surface of the bag receiving wall is substantially V-shaped. The vacuum cleaner according to 1 or 2.