JP2011087670A - Electric blower and vacuum cleaner using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive and highly reliable electric blower preventing microdust included in airflow from entering a bearing, and preventing rotation of the bearing from being blocked or locked. <P>SOLUTION: The electric blower includes: a stator 2 mounted in a housing 11 and having a field winding 4; a rotor 5 composed of an armature winding 8 provided at a shaft 6 and a commutator 91 to which the armature winding 8 is connected, and rotatably supported at the housing 11 and a bracket 12; a carbon brush 26 for feeding the electric power to the commutator 91; an impeller 32 fixed to the shaft 6; an air guide 41 located downstream of the impeller 32 for straightening the airflow; and a casing 40 having an intake 40a at the center and covering the impeller 32 and the air guide 41. An annular projection 94 is formed on the bottom of the commutator 91, and the front end of the annular projection 94 is slid in contact with the housing 11. With this structure, entrance of microdust included in the airflow into the bearing 10a is prevented, and the rotation of the bearing 10a is prevented from being blocked or locked. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electric blower and a vacuum cleaner mounted on a vacuum cleaner or the like.

  There existed what was shown by FIG. 4 about the structure of this kind of conventional general electric blower (for example, refer patent document 1).

  FIG. 4 is a half cross-sectional view of a conventional electric blower described in Patent Document 1. In FIG. 4, the electric motor 31 constituting the electric blower 1 is constituted by a housing 11 having a substantially cylindrical shape with one end opened, and a bracket 12 provided with a holding portion that closes the opening and holds a bearing 10 b described later at the center. The casing is formed.

  A stator 2 formed by applying a field winding 4 to a field core 3 is fixed to an inner surface of a housing 11. The rotor 5 includes an armature core 7 provided with an armature winding 8 and a commutator 9 disposed on the shaft 6. The rotor 5 is rotatably provided on the housing 11 and the bracket 12 by bearings 10 a and 10 b. . A pair of brush holders 15 each having a carbon brush 26 are fixed to the housing 11.

  The impeller 32 includes a rear shroud 33 made of sheet metal, a front shroud 34 having an air inlet 34 a in the center, and a blade 35 made of sheet metal provided between the front shroud 34 and the rear shroud 33. The impeller 32 is fixed to the end of the shaft 6 of the electric motor 31, and an air guide 41 having a stationary blade for rectifying the discharge flow is provided on the outer periphery of the impeller 32, and a casing 40 that includes the impeller 32 and the air guide 41. However, it is airtightly attached to the outer periphery of the bracket 12 of the electric motor 31.

  In the above configuration, when the electric blower 1 is energized and operated, the armature winding 8 is energized from the carbon brush 26 through the commutator 9. The rotor 5 rotates due to the magnetic field generated by the field winding 4 and the action of the armature winding 8. When the rotor 5 rotates, the impeller 32 provided on the shaft 6 that is the output shaft rotates. The impeller 32 rotates, air is sucked through the intake port 40 a of the casing 40, and is discharged from the outer periphery of the impeller 32. The discharged high-speed air flow passes while being rectified by the air guide 41, flows below the bracket 12, flows into the electric motor 31, and cools the field winding 4 and the armature winding 8 while cooling the electric blower 1. Discharged from.

Japanese Patent No. 3246039

  However, in such a configuration of the conventional electric blower 1, when the impeller 32 rotates, an air flow is generated, passes through the air guide 41 while being rectified, flows downward of the bracket 12, and flows into the electric motor 31. While the field winding 4 and the armature winding 8 are cooled, they are discharged from the electric blower 1. At this time, the air flow contains very small dust, and in particular, the electric blower is mounted. If the vacuum cleaner continues to be used for many years, this minute dust enters the inside of the bearing 10a, gradually obstructs the rotation inside the bearing 10a, and in the extreme case, locks the bearing 10a, leading to the failure of the electric blower 1. There was a problem.

  The present invention solves the above-described conventional problems, and prevents the minute dust contained in the air flow from entering the inside of the bearing, and can prevent the rotation of the bearing from being hindered or locked. Then, it aims at providing a highly reliable electric blower.

  In order to solve the above-described conventional problems, an electric blower of the present invention includes a stator provided in a housing and having a field winding, an armature winding provided on a shaft, and a substantially cylinder to which the armature winding is connected. A rotor configured to be rotatably supported by the housing and the bracket, a carbon brush for supplying electric power to the commutator, an impeller fixed to the shaft, and a downstream side of the impeller An air guide that rectifies the airflow, and a casing that has an air inlet in the center and covers the impeller and the air guide, and forms an annular protrusion on the bottom surface of the commutator, and the tip of the annular protrusion is Because it is in sliding contact with the housing, it can prevent the minute dust contained in the air flow from entering the inside of the bearing, and it can prevent the rotation of the bearing from being hindered and locked. It is capable of providing security capabilities electric blower.

  The vacuum cleaner of the present invention comprises the electric blower according to claim 1 and a dust collecting chamber that communicates with the electric blower and collects dust, and is inexpensive and reliable. A vacuum cleaner with high performance can be realized.

  The electric blower of the present invention is composed of parts that are not different from conventional ones, and is inexpensive and highly reliable. By using the electric blower for a vacuum cleaner, a high-performance and highly reliable vacuum cleaner can be obtained. Can be provided.

Half sectional view of the electric blower in the first embodiment of the present invention The main part enlarged sectional view of the electric blower (A) The principal part expanded sectional view of the electric blower in the 2nd Embodiment of this invention, (b) The principal part expanded sectional view which shows the other example of the electric blower. Sectional view of the main parts of a conventional electric blower

  According to a first aspect of the present invention, there is provided a stator having a field winding provided in a housing, an armature winding provided on a shaft, and a substantially cylindrical commutator to which the armature winding is connected. And a rotor rotatably supported by the bracket, a carbon brush for supplying electric power to the commutator, an impeller fixed to the shaft, an air guide located downstream of the impeller and rectifying an air flow, and a center A casing having a suction port at the portion and covering the impeller and the air guide, and forming an annular convex portion on a bottom surface of the commutator, wherein a tip of the annular convex portion is brought into sliding contact with the housing. It is possible to prevent the minute dust contained in the inside of the bearing from entering the inside of the bearing and to prevent the bearing from being hindered or locked, so that it is possible to provide a highly reliable electric blower at a low cost. It is kill things.

  In the second invention, in particular, an annular bank portion is formed on the inner surface of the housing of the first invention at a position facing the annular convex portion, and a minute clearance is provided between the annular convex portion and the annular bank portion. Therefore, the minute dust contained in the air flow can be prevented from entering the inside of the bearing and the mechanical loss during rotation can be reduced. Therefore, it is possible to provide a low-cost and highly reliable electric fan with high performance.

  A third invention includes the electric blower according to claim 1 or 2 and a dust collecting chamber that communicates with the electric blower and collects dust, and is inexpensive, highly reliable, and has high performance. A high vacuum cleaner can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a half sectional view of an electric blower according to the first embodiment of the present invention, and FIG. 2 is an enlarged sectional view of a main part of the electric blower. In addition, about the same component as the said conventional electric blower, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 1, the electric blower 1 according to the present embodiment includes an impeller 32 provided at one end of a shaft 6 that is an output shaft of the electric motor 31, an air guide 41 provided around the impeller 32, and a commutator. 91 and a casing 40 covering them.

  As shown in FIG. 2, the commutator 91 is connected to the armature winding 8, and a plurality of conductive child pieces 92 arranged in an annular arrangement are integrated with the child pieces 92. In general, it is formed in a substantially cylindrical shape by a thermosetting resin 93 having insulating properties which is molded and held. An annular convex portion 94 formed of resin 93 is provided on the bottom surface portion of the substantially cylindrical commutator 91. The tip of the annular convex portion 94 has a very thin thickness.

  In a state in which the commutator 91 is incorporated in the housing 11, the tip end portion of the annular convex portion 94 is configured to slightly touch the inner surface of the housing 11, and when the rotor 5 rotates, the annular convex portion 94 is It rotates while contacting the inner surface of the housing 11.

  The operation and action of the electric blower in the present embodiment configured as described above will be described. When the electric blower 1 is energized and operated, the armature winding 8 is energized from the carbon brush 26 through the commutator 9. The rotor 5 rotates due to the magnetic field generated by the field winding 4 and the action of the armature winding 8. When the rotor 5 rotates, the impeller 32 provided on the shaft 6 that is the output shaft rotates. The impeller 32 rotates, air is sucked through the intake port 40 a of the casing 40, and is discharged from the outer periphery of the impeller 32.

  The discharged high-speed air flow passes through the air guide 41 while being rectified, flows into the lower part of the bracket 12, flows into the electric motor 31, and cools the field winding 4 and the armature winding 8 while cooling the electric blower. 1 is discharged.

  At this time, since the annular convex portion 94 of the commutator 91 is in sliding contact with the inner surface of the housing 11, minute dust contained in the air flow is prevented from entering the inside of the bearing 10 a, so that the rotation of the bearing 10 a is performed. The electric blower having high reliability without impairing the performance can be realized with the same component configuration as the conventional one.

(Embodiment 2)
Fig.3 (a) is a principal part expanded sectional view of the electric blower in the 2nd Embodiment of this invention. In addition, the same code | symbol is attached | subjected to the same component as the electric blower in the said 1st Embodiment, and the description is abbreviate | omitted.

In FIG. 3A, the electric blower in the present embodiment has an annular bank portion 95 formed at a position of the housing 11 opposite to the inner diameter of the annular convex portion 94 provided at the bottom of the commutator 91. . In the present embodiment, the annular bank portion 95 of the housing 11 and the annular convex portion 94 of the commutator 91 are somewhat overlapped, and the radial clearance between the two is set to be a very small gap, Forms a labyrinth shape.

  The operation and action of the electric blower in the present embodiment configured as described above will be described. When the electric blower 1 is energized and operated, the armature winding 8 is energized from the carbon brush 26 through the commutator 9. The rotor 5 rotates due to the magnetic field generated by the field winding 4 and the action of the armature winding 8. When the rotor 5 rotates, the impeller 32 provided on the shaft 6 that is the output shaft rotates.

  The impeller 32 rotates and air is sucked through the intake port 40 a of the casing 40 and discharged from the outer periphery of the impeller 32. The discharged high-speed air flow passes through the air guide 41 while being rectified, flows into the lower part of the bracket 12, flows into the electric motor 31, and cools the field winding 4 and the armature winding 8 while cooling the electric blower. 1 is discharged.

  At this time, since the annular convex portion 94 of the commutator 91 and the annular bank portion 95 of the housing 11 constitute a labyrinth shape, it is possible to reliably suppress the entry of minute dust contained in the airflow into the bearing 10a. In addition, since the annular convex portion 94 and the annular bank portion 95 are not in contact with each other, there is no mechanical loss during rotation, and a highly reliable and high-performance electric blower can be realized with the same component configuration as before. Is.

  In the embodiment described above, the annular bank portion 95 is formed inside the annular convex portion 94. However, as shown in FIG. 3B, on the outer peripheral side of the annular convex portion 94 of the electric motor 91, the housing 11 Even if the annular bank portion 95 is formed, the labyrinth shape is similarly configured, and it goes without saying that the same effect can be obtained.

  Further, the electric blower 1 described in the first and second embodiments is used in a vacuum cleaner (not shown) provided with a dust collection chamber (not shown) for collecting dust. It is possible to realize a vacuum cleaner that is inexpensive, has high reliability and high performance by being mounted so as to communicate with the.

  As described above, in the electric blower according to the present invention, the reliability can be improved with the same component structure as the conventional one, so that it can be used for a vacuum cleaner, other household appliances, industrial equipment, and the like. It is useful that can be widely applied.

DESCRIPTION OF SYMBOLS 1 Electric blower 2 Stator 3 Field core 4 Field winding 5 Rotor 6 Shaft 7 Armature core 8 Armature winding 10a, 10b Bearing 11 Housing 12 Bracket 15 Brush holder 26 Carbon brush 31 Electric motor 32 Impeller 33 Rear shroud 34 Front surface Shroud 34a, 40a Air inlet 35 Blade 40 Casing 41 Air guide 91 Commutator 92 Child piece 93 Resin 94 Annular convex part 95 Annular bank part

Claims (3)

A stator having a field winding provided in a housing, an armature winding provided on a shaft, and a substantially cylindrical commutator to which the armature winding is connected. The housing and the bracket are rotatable. A supported rotor, a carbon brush for supplying electric power to the commutator, an impeller fixed to the shaft, an air guide located downstream of the impeller to rectify an air flow, and an air inlet at the center. An electric blower comprising: a casing that covers the impeller and the air guide, wherein an annular protrusion is formed on a bottom surface of the commutator, and a tip of the annular protrusion is brought into sliding contact with the housing. 2. The electric motor according to claim 1, wherein an annular bank portion is formed on the inner surface of the housing at a position facing the annular convex portion, and a minute clearance is provided between the annular convex portion and the annular bank portion. Blower. An electric vacuum cleaner comprising: the electric blower according to claim 1; and a dust collecting chamber that communicates with the electric blower and collects dust.

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