JP2001204662A - Electric vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an electric vacuum cleaner capable of improving each of the sealability, resistance to vibration, and mountability of support rubber to be arranged between the fan cover of a motor-driven blower and the entrance-side part of the motor-driven blower cover, manufacturing the rubber at a low cost, and making it lightweight. SOLUTION: The electric vacuum cleaner is provided with the support rubber 25 to support the motor-driven blower 22 as maintaining the airtightness between the inner circumferential surface of the entrance-side part (first circumferential wall part) 35a of the motor-driven blower cover 23 and the fan cover 79 of the motor-driven blower 22 with a suction opening 80. The support rubber 25 comprises an inside tube part 25a to be fitted over the outer circumferential surface of the cover 79, an outside tube part 25b to be fitted in the inner circumferential surface of the first circumferential wall part 35a of the cover 23, and a closing part 25c to close both tube parts 25a and 25b on the side of the dust collecting chamber 11. A circular cavity part E on which the exhaust pressure of air discharged from the motor-driven blower 22 acts is formed by both tube parts 25a and 25b and closing part 25c. The both tube parts 25a and 25b are pressed against both inner and outer circumferential surfaces by the exhaust pressure acting on the cavity part E to heighten sealability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circulation type in which exhaust air discharged from an electric blower is returned to a suction port and circulated for cleaning, or the air is directly circulated from a cleaner body without circulating the exhaust air. The present invention relates to a non-circulation type vacuum cleaner that performs cleaning while discharging the inside.

[0002]

2. Description of the Related Art A structure in which an electric blower cover surrounding the electric blower is separate from a vacuum cleaner body is intended to reduce noise by using the cover regardless of whether the electric blower is a circulation type or a non-circulation type. And has been proposed and filed by the present applicant.

[0003] In the configuration provided with the electric blower cover, the electric blower is built in the electric blower cover by exposing the intake port of the fan cover from the electric blower cover,
An annular support rubber is interposed between an inlet side portion of the electric blower cover that exposes the intake port and a fan cover of the electric blower. The support rubber has a function of supporting the dust collecting chamber side of the electric blower and a function of sealing the discharged air discharged from the electric blower and filled in the electric blower cover so as not to leak to the dust collecting chamber side. I am carrying it.

In the configuration using the electric blower cover, the exhaust pressure of the air discharged from the electric blower is higher than in the configuration not using this cover. In particular, the circulation type vacuum cleaner has a higher exhaust pressure in relation to circulating the exhaust air, and in particular, among the circulation type vacuum cleaners, when circulating all of the exhaust air discharged from the electric blower,
In a configuration in which the return air path resistance is large, such as when a filter is provided in the return air path from the electric blower to the suction port, the exhaust pressure is further increased. Therefore, the support rubber is required to have high sealing performance in order to prevent the exhaust air filled in the electric blower cover from leaking due to such exhaust pressure.

However, the conventional support rubber has such a thickness that the gap between the outer peripheral surface of the fan cover and the inner peripheral surface of the inlet side portion of the electric blower cover is tightly closed, and is fitted between the inner and outer peripheral surfaces. It is provided so as to be interposed and sandwiched.

[0006] As described above, since the sealing property of the support rubber is exclusively dependent on the force for sandwiching the support rubber, when the exhaust pressure rises rapidly, the outer peripheral surface of the fan cover closed with the support rubber is electrically driven. There may be cases where the required airtightness cannot be secured due to leakage between the air blower cover and the exhaust air filling the inside of the blower cover outside through the space between the inner peripheral surface of the inlet side portion of the blower cover and the dust collecting chamber side, Then, the leaked air is sucked again from the dust collection chamber, so that the dust absorbing performance is reduced. Further, for the same reason, it is difficult to completely circulate the exhaust air in the circulation type vacuum cleaner, and at present, it is necessary to discharge a part of the exhaust air directly from the cleaner body to the atmosphere. In order to provide a full-circulation type vacuum cleaner, it is desired to improve the sealing property.

In addition, the support rubber is fitted and fitted so as to be pressed into an annular gap between the outer peripheral surface of the fan cover and the inner peripheral surface of the inlet side portion of the electric blower cover. Since the elastic deformation of the support rubber is easily limited, the support rubber cannot be easily attached to the gap. In addition, since the support rubber is packed without a gap between the outer peripheral surface of the fan cover and the inner peripheral surface of the inlet side portion of the electric blower cover as described above, the vibration of the electric blower is transmitted through the support rubber. It is relatively easy to transmit to the electric blower cover and eventually the vacuum cleaner main body side. Moreover, in order to fill the support rubber without gap between the outer peripheral surface of the fan cover and the inner peripheral surface of the inlet side portion of the electric blower cover,
The amount of rubber material used for the support rubber is large, the cost is high, and the weight is heavy.

[0008]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to provide a seal, a vibration-proof property, and a support rubber disposed between a fan cover of an electric blower and an inlet side portion of the electric blower cover. An object of the present invention is to provide a vacuum cleaner capable of improving the mounting properties and reducing the cost and weight of the support rubber.

[0009]

According to a first aspect of the present invention, there is provided a cleaner body having a dust collecting chamber.
An electric blower located downstream of the dust collecting chamber and built in the cleaner body, an inlet for exposing an intake port of a fan cover provided in the electric blower, and an outlet for air exhausted from the electric blower. An electric blower cover that houses the electric blower and is built in the cleaner body, and is provided between an inner peripheral surface of an inlet side portion of the electric blower cover and an outer peripheral surface of the fan cover. A support rubber for airtightness between peripheral surfaces, wherein the support rubber is fitted to an outer peripheral surface of the fan cover, and an outer cylinder fitted to an inner peripheral surface of an inlet side portion of the electric blower cover. And a closing portion that closes the dust collection chamber between the two cylindrical portions, thereby forming an annular cavity in which the exhaust pressure of the air discharged from the electric blower acts.

The present invention can be applied to a circulation type vacuum cleaner or a non-circulation type vacuum cleaner. In this invention and the following inventions, the closing portion of the support rubber may be formed as in the invention of claim 5, or may be formed so as not to be in contact with a suction air passage member described later. Good.

In order to solve the same problem, the invention according to claim 2 is characterized in that the dust on the surface to be cleaned is sucked from the suction port by the operation of the electric blower, and the dust is captured by the filter.
In a circulation type vacuum cleaner which returns the air discharged from the electric blower through the filter to the suction port body and collects and returns the returned air to perform cleaning while circulating, the filter is housed. A vacuum cleaner main body having a dust collecting chamber, an electric blower positioned downstream of the dust collecting chamber and built in the cleaner main body, an inlet for exposing an air inlet of a fan cover provided in the electric blower, and An electric blower cover having an outlet for air discharged from the electric blower, containing the electric blower, and being built in the cleaner body, an inner peripheral surface of an inlet side portion of the electric blower cover, and the fan cover A support rubber provided between the outer peripheral surface of the fan cover and the outer peripheral surface of the fan cover for airtightness. An outer cylindrical portion that fits on the inner peripheral surface of the inlet side portion of the cover, and a closing portion that closes the dust collection chamber side between the two cylindrical portions, thereby reducing the exhaust pressure of the air exhausted from the electric blower. A working annular cavity is formed.

The invention of claim 2 can be applied to a vacuum cleaner which performs a circulating cleaning while releasing a part of the circulated air from the cleaner body to the atmosphere, and is accompanied by such discharge. The present invention can also be applied to an electric vacuum cleaner that performs circulation cleaning while completely circulating the air discharged from the electric blower without using the electric fan.

According to the first and second aspects of the present invention, the air blown by the operation of the electric blower into the intake port of the fan cover and discharged from the electric blower (discharged air).
Fills the electric blower cover and flows out of the outlet. In the non-circulating vacuum cleaner, the discharged air is discharged directly from the cleaner body into the atmosphere. In the circulating vacuum cleaner, the discharged air is returned to the suction port and collected by the suction port. ), Is again sucked into the electric blower through the dust collection chamber and circulated.

Then, the pressure (exhaust pressure) of the exhaust air filled in the electric blower cover spreads to the support rubber cavity in which the dust collection chamber side is closed at the closing portion. Therefore, the inner cylindrical portion of the support rubber is pressed against the outer peripheral surface of the fan cover to which it is fitted by being pressed by the exhaust pressure, and similarly, the outer cylindrical portion of the support rubber is fitted to the electric blower to which it is fitted. The cover is pressed against the inner peripheral surface of the inlet side portion of the cover by the exhaust pressure and comes into close contact therewith. The close contact force increases and decreases in accordance with the fluctuation of the exhaust pressure. For example, as the exhaust pressure increases, the close contact force between the inner and outer cylindrical portions on the inner and outer peripheral surfaces increases, and the sealing performance at the close contact portion is increased. Is improved.

As described above, in the first and second aspects of the present invention, the sealing performance is exerted by utilizing the exhaust pressure. Therefore, even in a non-circulating type vacuum cleaner, it can be circulated, separated, and completely circulated. Even in the vacuum cleaner of the type, it is possible to improve the sealing property of the support rubber disposed between the fan cover of the electric blower and the inlet side portion of the electric blower cover.

Further, according to the first and second aspects of the present invention, since the support rubber has the hollow portion, the vibration accompanying the operation of the electric blower is not directly transmitted from the inner cylindrical portion to the outer cylindrical portion. At the same time, the closed portion forming the vibration transmission path between the two cylindrical portions can be easily elastically deformed by the hollow portion, so that the vibration absorbing performance is high. Moreover,
Since the inner and outer cylinders can be easily elastically deformed by the cavity, these two cylinders are easily fitted into the annular gap between the outer peripheral surface of the fan cover and the inner peripheral surface of the inlet side portion of the electric blower cover. Can be included. Further, since the support rubber has the hollow portion, the amount of the rubber material constituting the rubber can be reduced.

According to a third aspect of the present invention, the fan cover is provided with an inner windbreak portion for covering the tip of the inner cylindrical portion with respect to the exhaust air flowing into the hollow portion, and the exhaust air flowing into the hollow portion is provided. The electric blower cover is provided with an outer windshield covering the tip of the outer tubular portion. In the present invention, each windproof portion can be formed by a step or a convex portion, or a surrounding convex portion having a substantially L-shaped cross section surrounding the tip of the windproof portion, and these windproof portions are provided. It may be integral with or separate from the electric blower cover or fan cover.

In the present invention, when the exhaust pressure in the electric blower cover is not stable, for example, immediately after the electric blower is started, the exhaust air flowing into the hollow portion of the support rubber is supplied to the inner and outer cylindrical portions of the support rubber. The action on the tip can be prevented by the inner and outer windbreaks individually covering the tips of the inner and outer cylinders. Therefore, it is possible to prevent the inner and outer cylindrical portions of the support rubber from vibrating due to the unstable behavior of the exhaust air flowing into the hollow portion.

According to a fourth aspect of the present invention, the outer tubular portion is longer than the inner tubular portion.

In the present invention, the sealing property between the outer cylindrical portion of the support rubber and the inlet side portion of the electric blower cover fitted with the outer rubber portion can be particularly improved.

The invention according to claim 5 is characterized in that the closing portion is in contact with a suction air passage member for guiding air sucked into the suction port from the dust collection chamber.

In the present invention, the closing portion pushed toward the dust collection chamber by the exhaust pressure acting on the hollow portion can be pressed against the suction air passage member so as to be in close contact with the suction air passage member. Between them can be improved.

[0023]

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

1 to 3, reference numeral 1 denotes a pair of wheels 2.
And a cleaner body that can be freely moved on the surface to be cleaned by a turning wheel (not shown). The cleaner body 1 has a dust suction port 3 provided at a front portion thereof and one end of a dust suction communication pipe 6 having a flexible dust suction hose 4 and an inflexible dust suction pipe 5, that is, a dust suction hose 4. The suction pipe 8 is connected to the other end of the communication pipe 6, that is, the dust suction pipe 5. Although not shown, air exhausted from an electric blower, which will be described later,
The air is guided so as not to be mixed with the sucked air.

At the front of the cleaner main body 1 formed by combining a plurality of synthetic resin case members, a dust collecting chamber 11 having an upper opening is formed, and a downstream side of the dust collecting chamber 11 is formed. At the rear of the cleaner body 1 located at
Are formed. A dust collection bag 13 (see FIG. 1) as a filter is housed in the dust collection chamber 11 so as to be able to be taken in and out, and a rear filter unit 14 that supports the rear surface of the bag 13 is moved toward the blower chamber 12. Are located. As shown in FIG. 1, the upper opening of the dust collection chamber 11 is airtightly closed by a case cover 15 which can be opened and closed. The dust bag 13 can be arbitrarily attached and detached through the upper surface of the dust chamber 11, and the unit 14 can be removed as needed. 2 and 3, reference numeral 13a denotes a cardboard mouth frame of the dust collecting bag 13. Although not shown, the mouth frame 13a actually passes through an opening communicating with the dust suction port 3 through the center.

As shown in FIG. 3, a rubber packing 16 is fitted and attached to the dust suction port 3 formed on the front wall of the dust collection chamber 11. And a seal portion protruding toward the dust collection chamber 11 side.

The mouth frame 13a comes into contact with the sealing portion so as to achieve a sealing property therebetween. In FIG. 3, reference numeral 10 denotes a downwardly mounted shaft integrally projecting from the bottom wall of the cleaner body 1, to which the above-mentioned turning wheel (not shown) is mounted.

A blower unit 21 is built in a blower room 12 in which the wheels 2 are rotatably mounted on both sides. The unit 21 includes an electric blower 22, an electric blower cover 23, a cord reel device 24, a first support rubber 25, and a second support rubber 26, as shown in FIGS. .

The electric blower 22 is a brushless type as shown in FIG. 5 and the like, and has a motor section controlled by an inverter and a fan section.

The motor section includes a motor case, a stator 71
, A rotor 72 having a magnet, and a current plate 73. The motor case is connected by screwing to a bridge-shaped second motor case 75 traversing one end opening thereof to a container-like first motor case 74 having one end opened and a stator 71 housed and fixed therein. It is formed. As shown in FIG. 3 and FIG.
A plurality of air discharge portions 82 are spaced apart in the circumferential direction on an end peripheral surface opposite to the second motor case 75. Reference numeral 83 in FIGS. 3 to 5 denotes a short cylindrical supported projection protruding from the center of the end wall of the first motor case 74. The rotor 72 is rotatably supported by bearings 76 and 77 provided on the first and second motor cases 74 and 75, respectively, and a rotor shaft 72a of the rotor 72 is disposed inside the stator 73. One end of the rotor shaft 72a passes through the bearing 77. The current plate 73 is screwed to the second motor case 75, and one end opening of the first motor case 74 and the second
The motor case 75 is covered and hidden. The rectifying plate 73 has a plurality of rectifying blades on both surfaces thereof for obtaining a diffuser function.

The fan unit is a centrifugal fan 78 connected to one end of a rotor shaft 72a that passes through a bearing 76.
And a fan cover 79 that covers the fan 78 and the current plate 73. On the front wall of the fan cover 79 facing the fan 78, a circular intake port 80 facing the suction port of the fan 78 is opened. The opening end on the first motor case 74 side, which is located on the side opposite to the side where the air inlet 80 of the fan cover 79 is located, is provided with an annular step 81 as an inner windbreak, and the diameter is enlarged. The fan cover 79 is attached to the motor portion by fitting the inner peripheral surface of the enlarged diameter end portion to the outer periphery of an annular projecting flange 74 a provided on the opening edge of the first motor case 74 with a slight press fit.

The electric blower 22 performs a blowing operation by rotating a fan 78 by its motor unit. That is, the rotationally driven fan 78 is
The air in the dust collection chamber 11 is sucked in from outside, and the air is discharged from the outer periphery. The air thus discharged is statically pressured while being guided to the rectifying blades located around the fan 78 in the rectifying plate 73, and after passing through the flow path between the rectifying blades and the fan cover 79, The air flow opening formed by the opening edge of the first motor case 74 and the second motor case 75 while being guided by the flow straightening vanes located on the motor portion side of the flow straightening plate 73 to further reduce the static pressure. Then, it flows into the first motor case 74. The air that has flowed into the first motor case 74 flows through the first motor case 74 while cooling the stator 71 and the rotor 72 and the like, and is discharged to the surroundings from the air discharge portion 82 at the rear.

As shown in FIGS. 3 to 5, the electric blower cover 23 made of a synthetic resin is formed by connecting a first case body 31 and a second case body 32 at a plurality of places by screws. Note that reference numeral 33 in FIG.
An annular rubber packing is interposed between the mating surfaces of the case members to ensure airtightness between the case members 31 and 32.

The first case body 31 has an inner cylindrical portion 35 as long as the entire length of the electric blower 22, an outer cylindrical portion 36 shorter than the cylindrical portion 35, and the two cylindrical portions 35, 36 integrally connected. And an end wall 37. Inner cylindrical part 35
A first peripheral wall portion 35a serving as an inlet side portion of the electric blower cover 23 that exposes the front wall having the air inlet 80 of the fan cover 79, and a second peripheral wall portion 35b having a slightly smaller diameter than the peripheral wall portion 35a. And a motor supporting portion 35c integrally continuous with the peripheral wall portion 35b.

An annular step 38 is formed between the first and second peripheral wall portions 35a and 35b as an outer windbreak, and the first and second peripheral wall portions 35a and 35a are formed through the step 38.
35b is integrally continuous. The first peripheral wall portion 35a is longer than the axial dimension of the fan cover 79, and therefore, the step 38 is formed behind the step 80 of the fan cover 79 and the enlarged diameter end. Motor support 35
c is a dish-shaped bracket that covers the end wall of the first motor case 74 having the supported projection 83, and a plurality of bridges that integrally connect the bracket and the second peripheral wall 35b (see FIG. 4). Only one is shown in the figure), and the ventilation portion between the bridge portions allows the air to be discharged from the air discharge portion 82.

The opening edge of the outer cylindrical portion 36 opposite to the end wall 37 is connected to the opening edge of the second case body 32 via the annular packing 33 as described above. As shown in FIG. 2, an outlet 61 of the air discharged from the electric blower is provided on the peripheral surface of the outer cylindrical portion 36 so as to protrude outward. One end of a return air path member 62 is connected to the outlet 61. The return air passage member 62 is arranged so as to bypass one side of the dust collection chamber 11, and the other end is connected to a discharge air side passage of the dust suction port 3. As shown in FIGS. 4 and 5, the end wall 37 has an annular groove 37a.

As shown in FIGS. 4 and 5, the second case body 32 has an air passage for guiding the exhaust air discharged through the air discharge part 82 to the outlet 61 between the second case body 32 and the first case body 31. An end wall 32b is integrally provided at one end of a stepped cylindrical portion 32a that covers the inner cylindrical portion 35 from the outer peripheral side. An outwardly projecting reel support shaft 34 is integrally formed on the outer surface of the central portion of the end wall 32b, and the inner surface of the central portion of the end wall 32b is brought into contact with the bracket portion of the electric motor support portion 35c. An annular seal projection 32c for sealing between them is projected.

As shown in FIGS. 3 to 5, an electric blower 22 is supported in the electric blower cover 23 having the above configuration. That is, the front fan cover 79 side is supported by the first peripheral wall portion 35a of the electric blower cover 23 via the first support rubber 25 in a vibration-proof manner, and the rear end portion of the first case body 31 is supported. The supported convex portion 83 is supported in a vibration-proof manner inside the motor support portion 35c of the electric blower cover 23 via the cap-shaped second support rubber 26. As described above, the electric blower 22 is mounted in the first case body 31 in a vibration-proof manner.

The first support rubber 25 used to support the electric blower 22 has an inner cylindrical portion 25a as shown in FIG.
, An outer tubular portion 25b, a closing portion 25c, a first front cover portion 25d, and a second front cover portion 25e. The outer cylinder part 25b is formed longer than the inner cylinder part 25a. The closing portion 25c integrally connects the end of the inner cylindrical portion 25a and the outer cylindrical portion 25b, for example, on the dust collection chamber 11 side,
The two tubular portions 25a and 25b are provided closed. An annular cavity E is formed between the closing portion 25c and the two cylindrical portions 25a and 25ba. The first front cover portion 25d is integrally formed to protrude radially inward from an end of the inner cylindrical portion 25a on the dust collection chamber 11 side, and the second front cover portion 25e is formed on the outer cylindrical portion 25b on the dust collection chamber 11 side. It is formed so as to integrally project radially outward from the end.

The first support rubber 25 has its inner cylindrical portion 25a fitted on the outer peripheral surface of the fan cover 79 and its outer cylindrical portion 25b fitted on the inner peripheral surface of the first peripheral wall portion 35a of the electric blower cover 23. In addition, the first front cover portion 25c is overlapped on the front wall of the fan cover 79 so that the intake port 80 of the wall is exposed, and the second front cover portion 25d is placed inside the end wall 37 of the electric blower cover 23. At the same time as being overlapped on the peripheral side, the annular convex portion on the back surface is fitted to the groove 37 a of the end wall 37 and attached.

In this mounted state, the first and second cylindrical portions 25a, 25 separated from each other by the cavity E are provided.
b shows the outer peripheral surface of the fan cover 79 and the electric blower cover 2
The first peripheral wall portion 35a is closed so as to be sandwiched therebetween. Also, the inner cylindrical portion 25
The tip of “a” is covered with a step 81 of the fan cover 79, and similarly, the tip of the outer tubular portion 25 b is covered with a step 38 of the electric blower cover 23.

As shown in FIG. 3 and FIG. 4, the code reel device 24 has a code reel 41 provided with upright annular flanges at both ends of a winding drum. It has a base wall 42 provided integrally therewith. A recess for accommodating the second case body 32 is formed by the code reel 41 and the base wall 42. In the winding groove of the cord reel 41, an insertion plug 44a is inserted into the end drawn out of the cleaner body 1.
A power cord 44 (shown in FIG. 1) is wound. The end wall 32 is provided on the base wall 42.
4b, a disk 45 is mounted in close proximity to the base plate 42, and a spiral spring 46 for rewinding is provided between the disk 45 and the base wall 42 (FIG. 4).
See).

Each of the base wall 42 and the disc 45 is rotatably supported by the reel support shaft 34, and
One end of the cord reel device 24 is supported by the electric blower cover 23 in a state where the rear portion of the electric blower cover 23, that is, the second case body 32 is accommodated in the concave portion. In this attachment, the center end of the spiral spring 46 is connected to the reel support shaft 34, and the outer end is connected to the base wall 42 and the like.

A slip ring mechanism (not shown) electrically connected to the power cord 44 is formed between the disk 45 and the end wall 32b.
2 is supplied. In addition, FIG.
Reference numeral 47 in FIG. 4 denotes a stopper that is non-rotatably connected to the distal end of the support shaft 34, and that prevents the cord reel device 24 from coming off the reel support shaft 34.

The open end of the cord reel 41 covering the cylindrical wall portion 32a of the second case body 32, that is, the end of the cord reel device 24 opposite to the base wall 42 is the second end.
It is rotatably supported on the outer periphery of the case body 32 via a plurality of rollers (not shown) attached to the outer periphery.

As shown in FIG. 3, the blower unit 21 having the above-described configuration is configured such that the fan cover 79 is placed in a horizontal position with the fan cover 79 facing the dust collecting chamber 11, and various ribs (three types) provided on the cleaner body 1. (Only the ribs 55 to 57 are shown) are supported and fixed in the blower room 12. As shown in FIG. 3, a suction air path member (inducer) 65 is arranged between the unit 21 and the dust collection chamber 11. The air passage member 60 allows the air passing through the dust collection chamber 11 to pass through the air inlet 8.
It functions as a guide leading to zero. The end of the suction air passage member 60 on the air inlet 80 side is in close contact with the closing portion 25c of the first support rubber 25 and the first front cover portion 25d as shown in FIG. Airtightness is achieved between.

The dust suction hose 4 is, for example, a coaxial two-piece hose.
It is a heavy pipe, and the dust-absorbed air sucked by the suction port 8 is passed through an air passage formed in the inner space of the bellows-like inner pipe,
The exhaust air guided by the return air passage member 62 is passed through an annular air passage formed between the inner tube and the bellows-shaped outer tube. A connection tube 64 having a handle 63 formed in a rectangular shape and protruding upward is provided at the tip of the dust suction hose 4. The handle 63 has various operation instructions and operations for the electric blower 22 and the like. A hand-operated control switch 63a (see FIG. 1) for instructing stop is provided.

The dust suction pipe 5 detachably connected to the connection cylinder 64 is composed of a first pipe 5a and a second pipe 5b which can be detached from each other, and these pipes 5a and 5b are both made of hard synthetic resin. An inner pipe and an outer pipe having a coaxial structure composed of pipes are provided, and an air passage inside the inner pipe is communicated with the inner pipe of the dust suction hose 4, and an annular air path between the inner and outer pipes is formed of the dust suction hose 4. It is designed to communicate with the annular passage.

The suction port 8 detachably connected to the tip of the dust suction pipe 5 has a connection pipe 65 for connecting to the dust suction pipe 5, and a suction opening ( (Not shown). The suction opening 8 has a built-in rotary cleaning body 66 that faces the suction opening and partially projects from the suction opening, and a cleaning motor 6 that rotates the cleaning body 66.
7 is built-in. The cleaning body motor 67 includes the dust collecting pipe 5
Is connected to the control switch 63a via an electric wire (not shown) provided along the axial direction.

The inside of the suction opening 8 is provided with a return air passage which guides and returns the exhaust air of the electric blower 22 introduced into the inside of the suction opening to the suction opening. A collection air path is formed for sucking dust on the cleaning surface and for sucking and collecting the exhaust air returned to the suction opening. The return air passage communicates with the annular air passage of the dust suction pipe 5, and the recovery air passage communicates with the air passage inside the inner pipe of the dust suction pipe 5.

The circulation-type vacuum cleaner having the above-described configuration is used by operating the control switch 63a in a state where the power cord 44 is pulled out and connected to an outlet. That is, when the electric blower 22 is driven according to the operation command of the control switch 63a, the dust collection chamber 11 becomes negative pressure by the blowing action of the electric blower 22. As a result, the air in the suction opening portion of the suction opening body 8 is sucked into the dust collecting bag 13 in the dust collecting chamber 11 through the inner pipe of the communication pipe 6 as shown by a dotted arrow in FIG. Dust contained in the suction airflow is removed by the dust bag 13.

The air sucked as described above is
The air flows through the electric blower 22 disposed on the downstream side of the dust collection chamber 11 as described above, and is discharged from the air discharge portion 82 of the motor unit into the electric blower cover 23 as exhaust air. The air discharged into the electric blower cover 23 is shown in FIG.
5 is guided by the outer peripheral surface of the inner cylindrical portion 35 of the first case body 31 of the electric blower cover 23 as shown by an arrow A in FIG.
(In other words, after flowing around the electric blower 22 from the rear side to the front side opposite to the flow direction of the suction airflow), the air blower cover 2 passes through the outlet 61.
3 is discharged outside.

Further, the exhaust air thus led out of the cover 23 passes through the dust suction port 3 from the return air passage member 62 and then returns to the suction opening of the suction port 8 through the annular ventilation path of the communication pipe 6. It is. The flow of the discharged air is indicated by solid arrows in FIG. And the returned exhaust air is
The air is sucked into the dust collecting chamber 11 again and circulated along the path shown by the dotted arrow in FIG. In this air circulation, the cleaning switch motor 67 is operated by operating the control switch 63a to rotate and drive the rotary cleaning member 66 as needed, so that dust on the surface to be cleaned can be sucked in while being lifted.

As described above, while the exhaust air from the electric blower 22 is returned to the suction opening 8 and completely circulated while being sucked, the circulating airflow removes dust on the surface to be cleaned facing the suction opening of the suction opening 8. The dust is sucked in, and the dust is removed by the dust collecting bag 13 in the suction path, so that the air circulation cleaning can be performed. According to the cleaning performed while circulating the air in this manner, in addition to suppressing the drive sound of the electric blower 22 from leaking to the outside, the drive sound is attenuated by the use of the electric blower cover 23, and the drive sound is attenuated. Cleaning can be performed, and cleaning can be performed while lightly moving the suction opening 8 while suppressing the surface to be cleaned from sucking into the suction opening.

The periphery of the electric blower 22 is surrounded by the electric blower cover 23, and the periphery of the second case body 32 of the cover 23 is also surrounded by the cord reel device 24. In other words, the periphery of the electric blower 22 is surrounded by a plurality of walls separated from each other. In this case, the fan cover 79 side is covered by the double walls of the inner and outer cylindrical portions 35 and 36 of the first case body 31, and the motor portion side is the inner cylindrical portion 3.
5, a second peripheral wall portion 35b, a cylindrical portion 32a of the second case body 32, and a cord reel 41. Therefore, the propagation of the operation sound generated by the electric blower 22 during cleaning to the surroundings can be attenuated by the multiple walls,
You can clean quietly. In addition, since the air discharged from the electric blower 22 does not pass through the electric blower cover 23 and the cord reel device 24 used as the sound-reducing material, the back pressure of the electric blower 22 does not increase, and the suction performance is reduced. Can also be suppressed.

In the air circulation type cleaning, the exhaust air discharged from the electric blower 22 fills the electric blower cover 23 and circulates through the path indicated by the arrow A in FIG. So the pressure of this exhaust air (exhaust pressure)
Spreads to the cavity E of the first support rubber 25. Therefore, the inner cylindrical portion 25a of the first support rubber 25 is pressed against the outer peripheral surface of the fan cover 79 to which the first support rubber 25 is fitted by the exhaust pressure, thereby increasing the degree of close contact. Similarly, the outer cylindrical portion 25b of the first support rubber 25 is pressed by the exhaust pressure against the inner peripheral surface of the first peripheral wall portion 35a forming the inlet side of the electric blower cover 23 to which the first support rubber 25 is fitted. And the degree of closeness is increased. In this case, depending on the fluctuation of the exhaust pressure, for example, when the suction opening of the suction port body 8 is closed, or when the amount of dust in the dust collection chamber 11 increases, as the exhaust pressure increases, the inner and outer Both cylinder parts 25a, 25
The close contact force of b on the inner and outer peripheral surfaces is increased.

Accordingly, although the exhaust pressure of the circulation type vacuum cleaner is higher than that of the non-circulation type vacuum cleaner, the fan cover 79 and the electric blower cover 23 are used as described above by utilizing the exhaust pressure. 1st support rubber 2 which seals between
5 can improve the sealing performance. Therefore, the exhaust air does not leak from the blower unit 21 through the space between the outer cylindrical portion 25b and the first peripheral wall portion 35a, and is discharged from the blower unit 21 through the space between the inner cylindrical portion 25a and the fan cover 79. Air leaks and intake port 8
It will not be sucked into zero. In this case, since the outer tubular portion 25b of the first support rubber 25 is longer than the inner tubular portion 25a, the sealing property between the outer tubular portion 25b and the first peripheral wall portion 35a of the electric blower cover 23 to which the outer tubular portion 25b is fitted. Can be particularly improved. Therefore, the dust absorption performance and the circulation performance of the exhaust air are not impaired.

Further, for example, immediately after the electric blower is started, a part of the exhaust air flows toward the closing portion 25c of the first support rubber 25 as shown by the arrow B in FIGS. Flow into However, the cavity E indicated by the arrow B
The step 81 of the fan cover 79 covers the front end of the inner cylindrical portion 25a with respect to the air flowing into the hollow portion E, and the step 38 of the electric blower cover 23 similarly forms the outer cylindrical portion with respect to the air flowing into the hollow portion E. Since the front end of the support rubber 25b is covered by the steps 81 and 38, the first support rubber 2
It is possible to prevent the inner and outer cylindrical portions 25a, 25b from being exposed. Therefore, it is possible to prevent the inner and outer cylindrical portions 25a and 25b from vibrating particularly at the tip end side.
The generation of noise due to the vibration of 5a and 25b can be prevented, and the deterioration of the sealing property of the first support rubber 25 can be prevented.

In addition, the closing portion 2 of the first support rubber 25
5c is an air inlet 80 of the fan cover 79 from the dust collection chamber 11.
Is in contact with the suction air passage member 60 that guides the suction air sucked into the air passage, and the exhaust pressure applied to the cavity E pushes the closing portion 25c toward the dust collection chamber 11 to make the suction air passage member 60 come into close contact with the suction air passage member 60. be able to. Therefore, the sealing property between the first support rubber 25 and the suction air passage member 60 can be improved.

In addition, it is impossible to prevent the electric blower 22 from vibrating during operation. However, since the first support rubber 25 has the hollow portion E, the inner cylindrical portion 25a in contact with the electric blower 22 which is a vibration source is provided.
This prevents the vibration of the electric blower 22 from being directly transmitted to the outer tubular portion 25b. In addition, the inner and outer cylindrical portions 25a, 2
The closing portion 25c forming a vibration transmission path between the hollow portions 5b
Since the elastic deformation can be more easily performed, the vibration is absorbed by the elastic deformation, and the transmission of the vibration to the outer cylindrical portion 25b and the electric blower cover 23 fitted to the outer cylindrical portion 25b can be prevented. Therefore, the vibration isolating support performance of the electric blower 22 by the first support rubber 25 having the hollow portion E can be improved, and the inner and outer cylindrical portions 25 of the first support rubber 25 can be improved.
a and 25b can be easily elastically deformed toward the cavity E side.
Can be easily fitted and mounted in an annular gap between the outer peripheral surface of the electric blower cover and the inner peripheral surface of the first peripheral wall portion 35a of the electric blower cover 23. That is, the attachment of the first support rubber 25 between the outer peripheral surface of the fan cover 72 and the inner peripheral surface of the first peripheral wall portion 35a can be improved.

Further, as described above, the first support rubber 25
Has the hollow portion E, the amount of the rubber material forming the first support rubber 25 can be reduced according to the amount corresponding to the hollow portion E. Therefore, it is possible to reduce the material cost and weight of the first support rubber 25.

[0062]

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

According to the first and second aspects of the present invention, the support rubber disposed between the fan cover of the electric blower and the inlet side portion of the electric blower cover seals using the exhaust pressure in the electric blower cover. Even if it is a non-circulating type vacuum cleaner, or a circulating type, a separate type or a completely circulating type vacuum cleaner, it is necessary to improve the sealing property by the support rubber. Can be. Furthermore, since the support rubber has the hollow portion, the vibration-proof support performance of the electric blower can be improved, and the gap between the outer peripheral surface of the fan cover and the inner peripheral surface of the inlet side portion of the electric blower cover can be improved. The mounting properties of the support rubber can be improved, and the amount of the rubber material constituting the support rubber is small, so that the cost can be reduced and the weight can be reduced.

According to the third aspect of the invention, the inner and outer cylindrical portions of the support rubber can be prevented from vibrating due to the unstable behavior of the exhaust air flowing into the hollow portion immediately after the electric blower is started. The generation of the accompanying noise can be prevented, and the deterioration of the sealing performance can be prevented.

According to the fourth aspect of the present invention, the sealing property between the outer cylindrical portion of the support rubber and the inlet side portion of the electric blower cover fitted with the outer rubber portion can be particularly improved.

According to the fifth aspect of the present invention, it is possible to improve the sealing property between the closed portion of the support rubber and the suction air passage member which is in contact with the closed portion.

[Brief description of the drawings]

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

FIG. 2 is a perspective view showing a part of the cleaner main body of the electric vacuum cleaner shown in FIG. 1 together with built-in components.

FIG. 3 is a perspective view showing a vacuum cleaner main body of the electric vacuum cleaner shown in FIG.

FIG. 4 is an exemplary perspective view showing a cross section of a blower unit included in the electric vacuum cleaner shown in FIG. 1;

FIG. 5 is a longitudinal sectional side view showing the blower unit shown in FIG. 4 with its cord reel device removed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Vacuum cleaner main body 8 ... Suction port body 11 ... Dust collection chamber 13 ... Dust collection bag (filter) 21 ... Blower unit 22 ... Electric blower 23 ... Electric blower cover 25 ... Support rubber 25a ... Inner cylinder part of support rubber 25b ... Outer cylindrical portion of support rubber 25c ... Closed portion of support rubber E ... Cavity portion of support rubber 31 ... First case body of electric blower cover 32 ... Second case body of electric blower cover 35a ... First peripheral wall of inner cylindrical portion 35 Part (entrance side part of electric blower cover) 38 ... Step (outside windbreak part) 61 ... Exit of electric blower cover 79 ... Fan cover 80 ... Intake port 81 ... Step (inside windproof part) 82 ... Air discharge part of electric blower

Claims (5)

[Claims] 1. A cleaner body having a dust collecting chamber, an electric blower located in the cleaner body located downstream of the dust collecting chamber, and exposing an air inlet of a fan cover provided in the electric blower. An electric blower cover having an inlet side portion to be made and an outlet for air exhausted from the electric blower, accommodating the electric blower, and being built into the cleaner body; and an inner periphery of the inlet side portion of the electric blower cover. A support rubber provided between the surface and an outer peripheral surface of the fan cover to provide airtightness between the two peripheral surfaces, wherein the support rubber is fitted to an outer peripheral surface of the fan cover; An outer tubular portion fitted to the inner peripheral surface of the inlet side portion of the electric blower cover, and a closing portion for closing the dust collection chamber side between the two tubular portions, thereby discharging air discharged from the electric blower. Atmospheric ring A vacuum cleaner characterized by forming a cavity. 2. The operation of an electric blower sucks dust on a surface to be cleaned through a suction port, and captures the dust with a filter.
A circulating vacuum cleaner that returns the air discharged from the electric blower through the filter to the suction port body and collects and returns the returned air to perform cleaning while circulating. A vacuum cleaner main body having a dust collecting chamber, an electric blower located downstream of the dust collecting chamber and built in the cleaner main body, and an inlet side for exposing an air inlet of a fan cover provided in the electric blower. An electric blower cover having a portion and an outlet for air discharged from the electric blower, containing the electric blower, and being built in the cleaner body, and an inner peripheral surface of an inlet side portion of the electric blower cover and A support rubber provided between the outer peripheral surface of the fan cover and the outer peripheral surface of the fan cover for airtightness between the two peripheral surfaces; An outer tubular portion fitted to the inner peripheral surface of the inlet side portion of the electric blower cover, and a closing portion for closing the dust collection chamber side between the two tubular portions, thereby discharging air discharged from the electric blower. A circulation type vacuum cleaner characterized by forming an annular cavity in which air pressure acts. 3. An inner windbreak provided on the fan cover for covering the tip of the inner cylindrical portion with respect to the exhaust air flowing into the hollow portion, and the outer cylindrical portion with respect to the exhaust air flowing into the hollow portion. The electric vacuum cleaner according to claim 1 or 2, wherein an outer windproof portion covering a tip of the electric blower is provided on the electric blower cover. 4. The vacuum cleaner according to claim 1, wherein the outer tubular portion is longer than the inner tubular portion. 5. The air conditioner according to claim 1, wherein said closing portion is in contact with a suction air passage member for guiding air drawn into said suction port from said dust collection chamber. Vacuum cleaner.