JP2000034993A - Electric blower and vacuum cleaner using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress disturbance of air flow in the vicinity of a suction port of an impeller by constituting at least one of a locking means fixing a rear face shroud to a rotary shaft or the rotary shaft so as to project to an opposite side of an electric motor of the suction port. SOLUTION: A rear face shroud 31 is held on a rotary shaft 37 of an electric motor by a first spacer 38, a washer 39, a pressing plate 40 and a second spacer 41 and a locking means 42 such as a nut is tightened and fixed on a screw part 43 provided at a tip part of the rotary shaft 37. A tip part 42a on an opposite side to an electric motor of the locking means 42 is projected to the opposite side to the electric motor of an opening location of a suction port 32a. Air flow flows from wide space into a suction port of a casing 48 and narrow space of the suction port 32a of an impeller 30 by an operation of the electric motor, but because the locking means 42 within the suction port 32a is projected from the suction port 32a of the impeller 30, air flow is straightened up to some degrees at a point of time when air flow passes the suction port 32a, disturbance of air flow is suppressed and a rise in pressure and inside flow are smoothly performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric blower and a vacuum cleaner using the same.

[0002]

2. Description of the Related Art In recent years, a vacuum cleaner using an electric blower has been required to have a high suction performance in order to efficiently clean a carpet.

A conventional electric blower will be described below with reference to FIGS.
19 will be described. 1 is an impeller main body. 2
Is a rear shroud made of sheet metal, and 3 is a front shroud made of sheet metal opposed thereto. Reference numeral 4 denotes a plurality of sheet metal blades provided in the pair of shrouds 2 and 3, and a plurality of engaged portions 5 are formed on the front and rear shrouds 3.2 opposed to the sheet metal blade 4. The engaging portion 6 formed on the blade 4 is joined by caulking. The rear shroud 2 is sandwiched between a rotating shaft 8 of an electric motor 7 by a first spacer 9 and a washer 10, and a holding plate 11 and a second spacer 12. It is fastened and fixed to a screw section 14 provided in the section.

[0004] Reference numeral 15 denotes an air guide provided with a plurality of stationary blades 16, and a volute chamber 17 is formed between adjacent stationary blades 16. Reference numeral 18 denotes a casing which includes the impeller main body 1 and the air guide 15 and has an air inlet 19 at a central portion which is hermetically attached to the outer periphery of the electric motor 7.

The operation of the above configuration will be described. When the impeller body 1 is rotated at a high speed by the electric motor 7,
Impeller body 1 communicating with air inlet 19 of casing 18
The airflow is sucked from the suction port 1a, passes between the adjacent sheet metal blades 4, and is discharged from the outer peripheral portion of the impeller body 1. Further, the airflow passes through a volute chamber 17 formed by a plurality of stationary blades 16 formed in an air guide 15 and is discharged into the electric motor 7.

[0006]

In the electric blower 20, during operation, near the entrance of the impeller body 1,
A large amount of air flows from the large space in front of the casing 18 into the narrow space of the suction port 1a of the impeller main body 1 at a stretch at a high speed, and the flow direction can be rapidly changed near the suction port 1a of the impeller main body 1. Therefore, there is a problem that the flow is disturbed in this portion and a loss occurs.

The present invention provides a rotary shaft 8 of an electric blower 20,
It is an object of the present invention to provide a small-sized electric blower with improved suction capability, in which the shape of the locking means 13 of the impeller body 1 is devised, loss due to turbulence of the air flow in this portion is suppressed.

In order to achieve the above object, the present invention has a structure in which at least one of the locking means and the rotating shaft projects from the air suction port to the side opposite to the electric motor. It is possible to suppress the disturbance of the air flow and reduce the loss.

[0009]

According to the present invention, at least one of a locking means and a rotating shaft is configured to protrude from a suction port to a side opposite to an electric motor. Since the disturbance of the air flow near the mouth is suppressed, the loss due to the disturbance of the air flow can be reduced.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION
A rear shroud fixed to the rotating shaft of the electric motor, and a front shroud opposed to this and having a suction port,
A plurality of blades provided in the pair of shrouds, and locking means for fixing the rear shroud to the rotating shaft, wherein at least one of the locking means or the rotating shaft is provided from the suction port. It protrudes toward the anti-motor side, and can easily suppress the turbulence of the air flow near the suction port of the impeller and reduce the loss.

The invention according to a second aspect of the present invention is provided with a locking means having a curved surface on the end face on the side opposite to the electric motor, thereby further suppressing the turbulence of the air flow near the suction port of the impeller and reducing the loss. Can be reduced.

The invention according to claim 3 of the present invention is provided with a substantially frustoconical locking means, which suppresses turbulence of the air flow near the suction port of the impeller and further reduces the loss. You can do it.

[0013] The invention according to claim 4 of the present invention is provided with the locking means provided with the guide wings for the inflow air, and the same effects as above can be obtained.

According to a fifth aspect of the present invention, there is provided a rear shroud fixed to a rotating shaft of an electric motor, a front shroud opposed to the front shroud and having a suction port, and a plurality of shrouds provided in the pair of shrouds. 5. An impeller comprising: a plurality of blades; an inducer having a plurality of three-dimensionally shaped blades continuous from each blade in the suction port direction; and the locking means according to claim 1; The air flow in the vicinity of the suction port is prevented from being disturbed, and the air flow in the impeller is not significantly disturbed by the inducer, and the air flow is efficiently discharged from the impeller. The loss due to the turbulence of the air flow can be further reduced.

According to a sixth aspect of the present invention, the normal line at the end of the blade of the inducer is substantially the same as the normal line at the tip on the center side of the blade, and the air flow inside the impeller main body is reduced. Smooth and reduce flow loss.

According to the invention of claim 7 of the present invention, the radius of curvature at the end of the blade of the inducer and the radius of curvature at the tip on the center side of the blade are made substantially the same. can get.

In the invention according to claim 8 of the present invention, the end of the blade of the inducer is made to contact only the front end in the rotation direction with the center end of the blade, and the end faces are bent. Even if they are joined, a gap is hardly generated on the same side, and the continuity of both blades can be maintained.

According to a ninth aspect of the present invention, a portion substantially parallel to the rotary shaft is provided on the suction port side of the front shroud, and the high-speed airflow sucked into the impeller gradually flows through the parallel portion. Since the gas flows into the impeller after deceleration, the loss of the flow can be reduced.

According to a tenth aspect of the present invention, a cross-sectional area S1 of a suction port surrounded by adjacent blades and a front shroud, and an exhaust port of an outer peripheral portion surrounded by adjacent blades and front and rear shrouds are provided. The ratio S1 / S2 of the area S2 of
By setting the value in the range of 0.012 to 0.06, it is possible to realize an optimal air passage and reduce flow loss.

According to an eleventh aspect of the present invention, the ratio D1 / D2 of the outer diameter D1 of the suction portion of the blade of the inducer to the outer diameter D2 of the hub corresponding to the base of the inducer is set to 0.4.
From 0.9 to 0.9, and the same effect as described above can be obtained.

According to a twelfth aspect of the present invention, there is provided a dust collecting chamber for collecting dust, a suction portion connected to communicate with the dust collecting chamber, and a suction section connected to the dust collecting chamber. It is a vacuum cleaner provided with the above-mentioned electric blower, and since an electric blower has high performance, a vacuum cleaner with high suction power can be provided.

[0022]

(Embodiment 1) A first embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 30 denotes an impeller body. Reference numeral 31 denotes a sheet metal rear shroud, and reference numeral 32 denotes a sheet metal front shroud provided with a suction port 32a opposed thereto. Reference numeral 33 denotes a plurality of sheet metal blades provided in the pair of shrouds 31 and 32. A plurality of engaged portions 34 are formed on the front and rear shrouds 32 and 31 opposed to the sheet metal blade 33. And an engaging portion 35 formed on the blade 33.
It is joined by caulking. The rear shroud 31 is attached to a rotating shaft 37 of an electric motor 36 by a first spacer 38 and a washer 39, and a holding plate 40 and a second spacer 4.
1, and is fixed by fastening a locking means 42 such as a nut to a screw portion 43 provided at the tip of the rotating shaft 37. The anti-motor side end 42a of the locking means 42 protrudes toward the anti-motor 36 side from the opening position of the suction port 32a which is the foremost end of the front shroud 32.

On the outer periphery of the impeller main body 30, an exhaust port 44 surrounded by the adjacent blade 33, the front shroud 32 and the rear shroud 31 is formed, and 45 is an air guide provided with a plurality of stationary blades 46. The adjacent stationary blade 46
A volute chamber 47 is formed between them. Reference numeral 48 denotes a casing which includes the impeller main body 30 and the air guide 45 and has an intake port 49 at a central portion which is hermetically attached to the outer periphery of the electric motor 36.

Reference numeral 50 denotes a resin-made inducer in which three-dimensionally curved blades 51 located on the extension of the sheet metal blade 33 are integrally formed on a hub 52.
0, a cylindrical spacer 5 fitted to the rotating shaft 37 is provided.
3 is provided integrally with the hub 52. The rear shroud 31 of the impeller 30 has a spacer 38 and a washer 39 on the side of the electric motor 36, and a screw provided on the tip of the rotary shaft 37 on the opposite side of the electric motor 36, which is sandwiched by the hub 52 of the inducer 50. Locking means 4 such as nuts
2 are clamped and fixed to the rotating shaft 37 of the electric motor 36.

The operation of the above configuration is as follows.
Impeller body 30 fixed to rotating shaft 37 of electric motor 36
When rotating at a high speed (40000 r / min), air is sucked from the suction port 32 a of the impeller body 30 communicating with the suction port 49 of the casing 48, and this air flow is generated by the front shroud 32, the rear shroud 31, and the sheet metal blade 33. Passing through the internal passage surrounded by
The exhaust gas is discharged from the exhaust port 44 at the outer peripheral portion. Impeller body 3
The air discharged from 0 is guided into an adjacent stationary blade 46 formed in the air guide 45 and a volute chamber 47 formed by a casing 48, and is discharged into the electric motor 36 from the lower surface of the air guide 45.

At this time, the air flows from the large space in front of the casing 48 into the narrow space of the suction port 44 of the casing 48 and the suction port 32a of the impeller 30 at a stretch, but the locking means at the central portion in the suction port 32a. Since 42 or the tip of the rotating shaft 37 protrudes from the suction port 32a of the impeller 30, the air flow is rectified to some extent at the time of passing through the suction port 32a, and it is possible to suppress the turbulent air flow. As a result, the pressure rise and internal flow are performed smoothly.

An impeller passing through an inner passage 50a surrounded by a front shroud 32, a blade 51 formed on a resin-made inducer 50, and a hub 52, and having an inducer 50 having a three-dimensional curved surface at the center. Needless to say, the same effect can be obtained with the 30.

(Embodiment 2) Next, a second embodiment of the present invention will be described with reference to FIG. The same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 5, a non-motor-side end surface 42a of a locking means 42 such as a nut for fixing the impeller 30 to the rotating shaft 37 has a curved surface at the outer edge of the end surface 42a.
Suction port 32a which is the foremost end of front shroud 32
Projecting toward the anti-motor 36 side from the opening position.

The operation of the above configuration is as follows.
That is, when the electric blower 36 is operated, the airflow flows into the suction port 49 of the casing 48 and the narrow space of the suction port 32a of the impeller 30 at a stretch from the wide space in front of the casing 48, but the air flow in the center of the suction port 32a. Since the locking means 42 of the portion protrudes from the suction port 32a of the impeller 30 and smoothly guides a portion that collides with the flow of the air flow downward, when the air passes through the suction port 32a, the collision of air The turbulent flow due to turbulence can also be suppressed, and the pressure rise and the internal flow are performed more smoothly.

(Embodiment 3) Next, a third embodiment of the present invention will be described with reference to FIG. The same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 6, an outer diameter D1 of a non-motor-side end surface 42a of a locking means 42 such as a nut for fixing the impeller 30 to the rotating shaft 37, and an outer diameter D2 of a motor-side end surface 42b.
Is D1 <D2, and the anti-motor side end surface 42a protrudes toward the anti-motor 36 side from the opening position of the suction port 32a, which is the foremost end of the front shroud 32.

The operation of the above configuration is as follows.
That is, when the electric blower 36 is operated, when the air flow is guided to the impeller 30, the locking means 42 at the center of the suction port 32 a projects from the suction port 32 a of the impeller 30, and Since the portion that collides with the flow of air is smoothly guided downward, the turbulence due to the collision of air can be suppressed at the time of passing through the suction port 32a, and the pressure rise and the internal flow can be performed more smoothly.

Incidentally, the end surface 42 of the locking means 42 on the side opposite to the electric motor.
When the outer diameter D1 of a is D1 ≒ 0, the shape of the locking means 42 is substantially conical, and it goes without saying that the influence of the collision can be further suppressed.

Embodiment 4 Next, a fourth embodiment of the present invention will be described with reference to FIG. The same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 7, a desired number of grooves or guide vanes 54 formed of a series of convex portions are provided on the surface of the locking means 42 for fixing the impeller 30 to the rotating shaft 37. Also,
The anti-motor side end surface 42a of the locking means 42 projects toward the anti-motor 36 side from the opening position of the suction port 32a, which is the foremost end of the front shroud 32.

The operation of the above configuration is as follows.
That is, when the electric blower 36 is operated, when the air flow is guided to the impeller 30, the locking means 42 at the center of the suction port 32 a projects from the suction port 32 a of the impeller 30, and Guide wings 54
Since the air flow is smoothly guided downward, the turbulence due to the collision of air can be suppressed at the time when the air flow passes through the suction port 32a, and the pressure rise and the internal flow are performed more smoothly. .

The guide vanes 54 are formed in a substantially spiral shape along the air flow, so that the flow can be performed more smoothly.

Embodiment 5 Next, a fifth embodiment of the present invention will be described with reference to FIG. The same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted. The blade 51 of the resin-made inducer 50 and the blade 33 made of sheet metal are continuously and smoothly joined. Although the curvatures of the two are different, the normal line 56 at the joint 55 is the same.

The operation of the above configuration is as follows.
The impeller main body 30 rotates at a high speed and sucks an air flow from the suction port 32a of the impeller main body 30, and this air flow passes through an internal passage surrounded by the front shroud 32, the blades 51 of the resin-made inducer 50, and the hub 52. And then the front and rear shrouds 32, 31 and the sheet metal blade 3.
The gas passes through an internal passage surrounded by 3 and is discharged from an exhaust port 44 on the outer periphery of the impeller body 30. At this time, the air flow is transmitted from the blade 51 of the resin-made inducer 50 to the blade 33 made of sheet metal.
, The fluid flows smoothly and smoothly, so that there is no pressure loss at the joint 55 of the two, and the pressure rise and the internal flow are performed smoothly.

As described above, according to the electric blower impeller 30 of this embodiment, the blades 5 of the resin-made inducer 50 are provided.
1 and the normal 5 at the joint 55 of the sheet metal blade 33
6 are matched with each other so that the blades 5 of the inducer 50
The curvature from 1 to the blade 33 changes smoothly,
Air flow is smooth, and resin inducer 5
The pressure drop and the turbulence of the air flow at the joint 55 between the zero blade 51 and the sheet metal blade 33 are reduced, and high suction performance can be obtained.

(Embodiment 6) Next, a sixth embodiment of the present invention will be described with reference to FIG. The same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 9, an inducer 50 made of resin is used.
The blades 51 and the blade 33 made of sheet metal are continuously and smoothly joined at the same curvature.

The operation of the above configuration is as follows.
The impeller main body 30 rotates at a high speed and sucks an air flow from the suction port 32a of the impeller main body 30, and this air flow passes through an internal passage surrounded by the front shroud 32, the blades 51 of the resin-made inducer 50, and the hub 52. And then the front and rear shrouds 32, 31 and the sheet metal blade 3.
The gas passes through an internal passage surrounded by 3 and is discharged from an exhaust port 44 on the outer periphery of the impeller body 30. At this time, the air flow is transmitted from the blade 51 of the resin-made inducer 50 to the blade 33 made of sheet metal.
, The fluid flows smoothly and smoothly, so that there is no pressure loss at the joint 55 of the two, and the pressure rise and the internal flow are performed smoothly.

As described above, according to the impeller 30 for an electric blower of the present embodiment, the blades 5 of the resin-made inducer 50 are provided.
1 and the normal 5 at the joint 55 of the sheet metal blade 33
6, the curvature from the inducer 50 to the blade 33 changes smoothly, the air flow becomes smooth, and the blades 5 of the resin-made inducer 50
The pressure drop and the turbulence of the air flow at the joint 55 between the sheet metal 1 and the blade 33 made of sheet metal are reduced, and high suction performance can be obtained.

(Embodiment 7) Next, a seventh embodiment of the present invention will be described with reference to FIG. The same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 10, a resin-made inducer 5 is shown.
The zero blade 51 and the sheet metal blade 33 are continuously and smoothly joined at the same curvature. In addition, the joint 55
Is performed in such a manner that only the front side with respect to the rotation direction of the impeller body 30 contacts, and a gap 57 exists on the rear side.

The operation of the above configuration is as follows.
The impeller body 30 rotates at a high speed and sucks airflow from the suction port 32a of the impeller body 30. This airflow passes through an internal passage surrounded by the front shroud 32, the resin-made inducer 50, and the hub 52. It passes through an internal passage surrounded by front and rear shrouds 32 and 31 and a blade 33 made of sheet metal, and an exhaust port 44 on the outer periphery of the impeller body 30.
Discharged from At this time, the air flow smoothly flows from the blades 51 of the resin-made inducer 50 to the blade 33 made of sheet metal, so that there is no pressure loss at the joint 55 of both, and the pressure rise and the internal flow are smooth. Done.

Further, since the blades 51 and the blades 33 of the inducer 50 are configured so as to contact only on the front side with respect to the rotation direction of the impeller main body 30, a molding mistake of the resin-made inducer 50 or a blade Even when the joining portion 55 is joined in a mountain-fold shape by springback or the like at the time of processing 33, a gap is hardly generated, and continuity is maintained. Further, when air leakage at the joint 55 prevents the pressure of the impeller 30 from increasing, and it becomes necessary to fill the gap with an adhesive or a paint, the air flows into the gap 57 on the rear surface side in the rotation direction to be airtight. Performance can be improved.

As described above, according to the electric blower impeller 30 of this embodiment, the blades 5 of the resin-made inducer 50 are provided.
1 and the blade 33 made of sheet metal have the same curvature, and the two are joined on the front side in the rotation direction of the impeller body 30.
3, the air flow becomes smooth, the pressure drop and the turbulence of the air flow at the joint 55 between the blade 51 of the resin-made inducer 50 and the blade 33 made of sheet metal are reduced, and both ends are processed or assembled. Even if the two are joined in a mountain-fold shape by mistake, a gap is hardly generated, and furthermore, the paint or the adhesive is easily poured into the gap 57 on the rear side in the rotation direction, so the gap is filled as necessary, Leakage can be prevented, and higher suction performance can be obtained.

(Embodiment 8) Next, an eighth embodiment of the present invention will be described with reference to FIG. The same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.

A portion 58 substantially parallel to the rotating shaft 37 is provided on the suction port 32a side of the front shroud 32.

The operation of the above configuration is as follows.
The high-speed airflow sucked into the impeller 30 is gradually decelerated and straightened by the parallel portion 58 provided on the front shroud 32, and then flows into the impeller 30, so that the flow loss can be reduced.

Embodiment 9 Next, a ninth embodiment of the present invention will be described with reference to FIGS. The same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The cross-sectional area S1 of the suction port 32a surrounded by the adjacent blades 51 and the front shroud 32, and the area S2 of the exhaust port 44 of the outer peripheral portion surrounded by the adjacent blade 33 and the front and rear shrouds 32, 31. The ratio S1 / S2 of
It is set in the range of 0.012 to 0.06.

The operation of the above configuration is as follows.
At the center of the hub 52 integrally formed with the inducer 50, a boss 53a having a built-in cylindrical spacer 53 for fixing the rotary shaft 37 of the electric motor 36 is required. Therefore, the air inflow area S1 becomes too small, and the impeller 3
The air flow velocity increases at the zero suction port 32a. In this case, for example, when the area S2 of the blade 33 adjacent to the outer peripheral portion of the impeller 30 and the exhaust port 44 surrounded by the front and rear shrouds 32 and 31 is small, the impeller 30
The flow velocity of the air flow at the outer circumference cannot be sufficiently reduced, and the outflow speed increases. The air flow discharged from the impeller 30 collides with the stationary blade 46 formed at the air guide 45 at a high speed, and the collision loss is reduced. It increased and reduced efficiency. Also,
When the area S2 of the exhaust port 44 is increased, the air flow is rapidly expanded, the deceleration loss is increased, and the fan efficiency is significantly reduced. In this case, it is conceivable to prevent the sudden expansion by increasing the flow path length in the impeller 30.
However, there is a problem that the outer diameter of "0" becomes large and miniaturization cannot be achieved.

Therefore, the efficiency difference of the electric blower when the value of S1 / S2 is changed is shown in FIG. 13 (b). S1 / S2
Is shown based on the efficiency in the case where is 0.015.

Here, if the value of S1 / S2 is smaller than 0.015, the air flow suddenly expands, the deceleration loss increases, and the fan efficiency remarkably decreases. On the other hand, if the value of S1 / S2 is larger than 0.06, the flow velocity of the air flow at the outer periphery of the impeller 30 cannot be sufficiently reduced and the outflow speed increases, and the air flow discharged from the impeller 30 is It collides with the stationary blade 46 formed on the guide 45 at high speed, the collision loss increases, and the efficiency decreases.

Here, when an optimum value of S1 / S2 is obtained from an experiment, a high efficiency can be maintained by setting the value between 0.012 and 0.06 as shown in FIG. In addition, it is possible to realize a high-efficiency electric blower which has a small suction capacity even though it is small.

(Embodiment 10) Next, a tenth embodiment of the present invention will be described with reference to FIGS. The same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The ratio D1 / D2 of the outer diameter D1 of the suction port 32a of the blade 51 of the inducer 50 to the outer diameter D2 of the hub 52 corresponding to the base of the inducer 50 is 0.4 to 0.9.
Is set in the range.

The operation of the above configuration is as follows.
The air flow sucked from the impeller body 30 is
Then, the airflow flows in a direction perpendicular to the rotation axis 37 after flowing in substantially parallel to the rotation direction. In this case, in order to smoothly change the direction of the air flow as much as possible, the dimensional relationship between D1 and D2 greatly affects. That is, when the value of D1 / D2 exceeds 0.9, the direction of the air flow is suddenly changed at the outlet of the blade 51 of the inducer 50, and the direction is not smoothly changed, and the efficiency is reduced. When the value of D1 / D2 is 0.
If it is less than 4, the direction of the air flow will be rapidly changed at the suction port 32a, and similarly, the direction change will not be performed smoothly, and the efficiency will be reduced.

Here, when an optimum value of D1 / D2 is obtained from an experiment, a high efficiency can be maintained if the value is set between 0.4 and 0.9. A simple electric blower can be realized.

(Embodiment 11) Next, an eleventh embodiment of the present invention will be described with reference to FIG.

FIG. 15 is a view showing the whole vacuum cleaner.
The main body 59 includes a dust collecting chamber 60 for repairing dust and the electric blower 61 described in the first to tenth embodiments.
Reference numeral 62 denotes a suction unit connected to communicate with the dust collection chamber 60.

The operation of the above configuration is as follows.
Since high suction performance can be obtained, a vacuum cleaner having a high suction force can be provided.

[0068]

According to the first aspect of the present invention,
Since the locking means of the impeller is made to protrude from the air suction port of the front shroud of the impeller, the pressure drop and the turbulence of the air flow are reduced, and an electric blower with high suction performance can be realized.

According to the second aspect of the present invention, since the impeller engaging means has a curved surface at the edge of the end face on the side opposite to the electric motor, the pressure drop and the turbulence of the air flow are reduced, and a higher suction is achieved. An electric blower with high performance can be realized.

According to the third aspect of the present invention, since the locking means of the impeller has a substantially frusto-conical shape, the pressure drop and the turbulence of the air flow are reduced, and the electric blower with higher suction performance is obtained. Can be realized.

According to the fourth aspect of the present invention, since the air guide vanes are provided on the surface of the locking means of the impeller, the pressure drop and the turbulence of the air flow are reduced, and a higher suction is achieved. An electric blower with high performance can be realized.

According to the fifth aspect of the present invention, a high-performance electric blower with a simple configuration is mounted.
An inexpensive vacuum cleaner having a high suction power can be realized.

According to the invention of claim 6 of the present invention, by smoothly and continuously joining the inducer and the blade, the air flow becomes smooth, and the pressure drop at the joint between the two can be reduced. High suction performance can be obtained by reducing the turbulence of the air flow.

According to the seventh aspect of the present invention, the same effect as described above can be obtained by smoothly and continuously joining the inducer and the blade.

According to the eighth aspect of the present invention, since the joining of the inducer and the blade is performed on the front side in the rotation direction of the impeller, the flow of air from the inducer to the blade is smooth. In addition to reducing pressure drop and turbulence in the air flow, gaps are less likely to occur even if the joint between the inducer and the blade is bent, and if there is a lot of air leakage at the joint, the rear surface in the rotation direction A paint or an adhesive can flow into the gap on the side, and higher suction performance can be obtained.

According to the ninth aspect of the present invention, since the high-speed airflow sucked into the impeller flows into the impeller after being gradually decelerated in the parallel portion, the flow loss can be reduced. Things.

According to the tenth aspect of the present invention,
By optimizing the ratio of S1 to S2 at 0.012 to 0.06, it is possible to reduce the loss of flow and maintain high efficiency, and realize a small but highly efficient electric blower with enhanced suction capacity. it can.

According to the eleventh aspect of the present invention,
By optimizing the ratio of D1 and D2 to 0.4 to 0.9, the direction of the sucked air flow can be smoothly changed, and the same effect as described above can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of an electric blower according to a first embodiment of the present invention.

FIG. 2 is a partially cutaway side view of the electric blower.

FIG. 3 is a side view of the impeller.

FIG. 4 is a sectional view of the impeller.

FIG. 5 is a sectional view of an impeller showing a second embodiment of the present invention.

FIG. 6 is a sectional view of an impeller showing a third embodiment of the present invention.

FIG. 7 is a sectional view of an impeller according to a fourth embodiment of the present invention.

FIG. 8 is a partially cutaway plan view of an impeller according to a fifth embodiment of the present invention.

FIG. 9 is a partially cutaway plan view of an impeller showing a sixth embodiment of the present invention.

FIG. 10 is a partially cutaway plan view of an impeller according to a seventh embodiment of the present invention.

FIG. 11 is a sectional view of an impeller according to an eighth embodiment of the present invention.

FIG. 12 is a partially cutaway perspective view of an impeller showing a ninth embodiment of the present invention.

FIG. 13 is a side view of the impeller.

FIG. 14 is a diagram showing a change in efficiency of the electric blower.

FIG. 15 is a partially cutaway perspective view of an impeller showing a tenth embodiment of the present invention.

FIG. 16 is a diagram showing a change in efficiency of the electric blower.

FIG. 17 is an overall perspective view of a vacuum cleaner showing an eleventh embodiment of the present invention.

FIG. 18 is a sectional view of a main part of an impeller of a conventional electric blower.

FIG. 19 is a partially cutaway side view of the electric blower.

[Explanation of symbols]

 REFERENCE SIGNS LIST 30 impeller main body 31 rear shroud 32 front shroud 32a suction port 33 blade 34 engaged part 35 engaging part 36 electric motor 37 rotating shaft 38 first spacer 39 washer 40 holding plate 41 second spacer 42 locking Means 43 Screw part 44 Exhaust port 45 Air guide 46 Stator blade 47 Volute chamber 48 Casing 49 Inlet port 50 Inducer 51 Blade 52 Hub 53 Cylindrical spacer 54 Guide wing 55 Joint 56 Normal 57 Gap 58 Parallel part 59 Main body 60 Dust collection chamber 61 Electric blower 62 Suction unit

 ──────────────────────────────────────────────────の Continuing on the front page (72) Yoshitaka Murata, Inventor 1006, Kazuma, Kadoma, Osaka Prefecture, Matsushita Electric Industrial Co., Ltd. Terms (reference) 3B006 FA02 3H033 AA02 BB02 BB06 BB20 CC01 CC06 DD02 DD13 DD30 EE08 EE19

Claims (12)

[Claims] A rear shroud fixed to a rotating shaft of an electric motor, a front shroud opposed to the front shroud and having a suction port, a plurality of blades provided in the pair of shrouds, and the rear shroud; An electric blower comprising: a locking unit fixed to the rotating shaft, wherein at least one of the locking unit and the rotating shaft protrudes from the suction port toward the non-motor side. 2. The electric blower according to claim 1, further comprising a locking means having a curved surface on the end surface on the side opposite to the electric motor. 3. The electric blower according to claim 1, further comprising a substantially frustoconical locking means. 4. The electric blower according to claim 1, further comprising a locking means provided with a guide blade for the inflow air. 5. A rear shroud fixed to a rotating shaft of an electric motor, a front shroud opposed to the front shroud and having a suction port, a plurality of blades provided in the pair of shrouds, and An electric blower comprising: an inducer having a plurality of three-dimensionally shaped blades continuous in a suction port direction; and the locking means according to claim 1. 6. The electric blower according to claim 5, wherein the normal line at the end of the blade of the inducer is substantially the same as the normal line at the tip on the center side of the blade. 7. The electric blower according to claim 6, wherein the radius of curvature at the end of the blade of the inducer is substantially the same as the radius of curvature at the center-side tip of the blade. 8. The electric blower according to claim 5, wherein the end of the blade of the inducer is in contact with the front end of the blade only on the front side in the rotation direction. 9. The electric blower according to claim 5, wherein a suction port side of the front shroud is provided with a portion substantially parallel to the rotation axis. 10. A ratio S1 / S2 of a sectional area S1 of a suction port surrounded by adjacent blades and a front shroud and an area S2 of an exhaust port of an outer peripheral portion surrounded by adjacent blades and front and rear shrouds. The electric blower according to any one of claims 5 to 9, wherein the electric blower is set in a range of 0.012 to 0.06. 11. A ratio D1 / D2 of an outer diameter D1 of a suction portion of a blade of an inducer to an outer diameter D2 of a hub corresponding to a base of the inducer is set in a range of 0.4 to 0.9. The electric blower according to claim 10. 12. A dust collecting chamber for collecting dust, a suction unit connected to communicate with the dust collecting chamber, and a suction unit.
An electric vacuum cleaner comprising: the electric blower according to any one of claims 11 to 11.