JP6557864B2 - Electric blower and electric vacuum cleaner using it - Google Patents

Description

  The present invention relates to an electric blower and a vacuum cleaner used for a vacuum cleaner and the like.

  As a configuration of a conventional general electric blower, one as shown in FIG. 6 has been proposed (for example, see Patent Document 1). FIG. 6 is a half sectional view showing a configuration of a conventional electric blower.

  As shown in FIG. 6, the conventional electric blower 101 includes an electric motor 102, an impeller 104, a diffuser 105, and a fan case 108. The impeller 104 is provided at one end of a shaft 103 that is an output shaft of the electric motor 102, and includes a plurality of blades 104a.

  The diffuser 105 is provided on the outer periphery of the impeller 104 and includes a plurality of stationary blades (not shown) that rectify the wind discharged from the impeller 104. The fan case 108 covers the impeller 104 and the diffuser 105. The fan case 108 has an air inlet 107 at the center.

  The electric motor 102 includes a field unit 114 and an armature unit 118 disposed inside the field unit 114.

  First, the configuration of the field unit 114 will be described. An insulating material (not shown) between the field iron core 109 and the field winding 111 and a base for winding the field winding 111 are formed on the field iron core 109 formed by laminating a plurality of electromagnetic steel plates. A reel 110 is attached. A field winding 111 is wound around the winding frame 110. One end of the field winding 111 is connected to a carbon brush (not shown), and the other end is connected to the power supply terminal 112. The power terminal 112 is inserted into a terminal block 113 provided on the reel 110.

  Next, the configuration of the armature unit 118 will be described. The armature core 116 is disposed inside the field unit 114, and the armature winding 115 is accommodated in a slot (not shown). Furthermore, the armature core 116 is composed of a laminated core. The armature unit 118 includes a shaft 103 as an output shaft and a commutator 117 provided at one end of the shaft 103 in the center of the armature core 116.

  The field unit 114 is press-fitted and fixed to the inner wall of a bottomed cylindrical bracket B119 having a flange portion 119a so that the power terminal 112 side becomes the impeller 104 side. The armature unit 118 is held by a bracket B119 so as to be rotatable via a bearing 120, and is closed by a bracket A106.

  The bracket B119 is provided with an exhaust port 121 serving as an outlet for air sucked from the intake port 107, and an opening 122 for connecting the power terminal 112 and an external lead wire (not shown) on the impeller 104 side. It has been.

  The operation of the conventional electric blower configured as described above is as follows.

When the operation of the electric blower 101 is started, a voltage is applied to the electric motor 102 from the power supply terminal 112. The field winding 111, the carbon brush (not shown), the commutator 117, and the armature winding 115 are energized in this order. The armature unit 118 is rotated by the action of the magnetic field generated by the field winding 111 and the current flowing through the armature winding 115.

  The impeller 104 connected to the shaft 103 rotates in conjunction with the operation of the electric motor 102. Then, due to the rotating action of the impeller, the vicinity of the air inlet 107 becomes a negative pressure with respect to the outside air and sucks air. The sucked air passes through the impeller 104, the diffuser 105, and the bracket A106, passes through the bracket B119 of the electric motor 102, and finally cools the field unit 14, the armature unit 118, the carbon brush, the bearing 120, and the like. Is discharged from the exhaust port 121 to the outside of the electric blower 101.

  A part of the air passes through the impeller 104 and the diffuser 106 and is directly discharged from the opening 122 to the outside of the electric blower 101.

JP 2014-141932 A

  However, in such a conventional electric blower, the air sucked by the rotation of the impeller 104 cools the generated field winding 111, armature winding 115, carbon brush, commutator 117, bearing 120, and the like. Before, it was discharged from the opening 122, and these components could not be cooled sufficiently. In addition, the bracket B119 is often made of a metal material because of strength, and it is necessary to electrically insulate the power supply terminal 112 from the metal bracket B119. The power supply terminal 112 and the bracket B119 are insulated from each other. Had to be placed at a distance. Therefore, the opening area of the opening 122 near the power terminal 112 tends to be larger than necessary.

  As a result, the temperature of each part increased, and there was a problem that not only the efficiency of the motor decreased, but also the product life was shortened due to the early wear of the carbon brush, the deterioration of the roundness of the commutator 117, and the grease deterioration of the bearing 120. .

  This invention solves the said conventional subject, and it aims at providing the electric blower and vacuum cleaner which reduced temperature rise and improved durability and reliability.

In order to achieve the above-described conventional problems, the electric blower of the present invention includes a winding frame made of an insulating material on both end faces of a field iron core, and the terminal frame on one side is provided with a terminal block for inserting a power supply terminal A field unit in which one end of a field winding wound around the winding frame is connected to the power supply terminal, and an armature core and a commutator provided with an armature winding are press-fitted into a shaft A sub-unit, an electric motor that rotatably supports one end of the shaft, and has an open end of a bottomed cylindrical bracket B enclosing the field unit and the armature core closed by a bracket A; On the outside of the bracket A, an impeller that is directly connected to the other end of the shaft and generates an air current, a diffuser that guides the air current from the impeller to the inside of the electric motor, a fan case that covers the impeller and the diffuser, In the electric blower provided with a pair of carbon brushes for supplying electric power to the flower, the commutator, the carbon brush, and the power supply terminal are positioned in the vicinity of the bracket A, and the electric motor is cooled in the vicinity of the bottom surface of the bracket B. An exhaust port for discharging the air after being provided is provided with an opening for supplying power to the power supply terminal in the vicinity of the bracket A, and a shielding plate made of an insulating material and closing most of the opening is provided. The shield plate is configured to be sandwiched between the winding frame and the bracket B, and since the airflow generated in the impeller by the shield plate is suppressed from being discharged from the opening, the air is sucked by the rotation of the impeller. Prevent air from being discharged from the upstream opening before cooling the heated field winding, armature winding, carbon brush, commutator, bearing, etc. Those that can provide an electric blower reliable with enhanced 却効 rate.

  Moreover, the vacuum cleaner of this invention was equipped with the electric blower of any one of Claims 1-4, and can implement | achieve the vacuum cleaner provided with high durability and reliability.

  The electric blower of the present invention realizes an electric blower with reduced temperature rise and improved durability and reliability. By mounting the electric blower on a vacuum cleaner, the durability and reliability are similarly improved. High vacuum cleaner can be provided.

Half sectional view of electric blower in Embodiment 1 of the present invention Perspective view of the electric blower Enlarged view near the power supply terminal of the electric blower External view of shielding plate attached to the electric blower The internal block diagram of the field unit of the electric blower, bracket A, and bracket B in Embodiment 2 of this invention Half sectional view of a conventional electric blower

  1st invention is provided with the winding frame which consists of an insulating material in the both end surfaces of a field iron core, The terminal block which inserts a power supply terminal is provided in the said winding frame of one side, and the field magnet wound by the said winding frame A field unit in which one end of the winding is connected to the power supply terminal, an armature unit in which an armature core and a commutator with armature winding are press-fitted into the shaft, and one end of the shaft are rotated. An electric motor that is freely supported and has an open end of a bottomed cylindrical bracket B that encloses the field unit and the armature core, and the shaft is disposed outside the bracket A. An impeller that is directly connected to the other end of the motor to generate an air current, a diffuser that guides the air current from the impeller to the inside of the electric motor, a fan case that covers the impeller and the diffuser, and a pair of carbon blocks that supply power to the commutator. In the electric blower provided with an air outlet, the commutator, the carbon brush, and the power terminal are positioned in the vicinity of the bracket A, and an exhaust port for discharging air after cooling the electric motor in the vicinity of the bottom surface of the bracket B is provided. An opening for supplying power to the power supply terminal is provided in the vicinity of the bracket A, and a shielding plate made of an insulating material for closing most of the opening is provided. Since the air flow generated from the opening is suppressed, the upstream opening before cooling the field winding, the armature winding, the carbon brush, the commutator, the bearing, and the like generated by the air sucked by the rotation of the impeller It is possible to provide a reliable electric blower that is prevented from being discharged from the section and has improved cooling efficiency.

  In the second invention, in particular, the shielding plate according to the first invention is arranged inside the opening, and the shielding plate does not come off or deform even when exhaust pressure is applied from the inside of the motor, so that the inside of the motor can be surely secured. Can be cooled.

  The third invention is such that the shielding plate of the first or second invention is sandwiched between the winding frame and the bracket B, and the shielding plate is easy due to the influence of exhaust pressure or motor vibration. It is possible to prevent cooling and to obtain a cooling effect with certainty.

  In the fourth invention, in particular, the shielding plate according to any one of the first to third inventions is integrally formed with the bracket A or the diffuser, so that the number of parts can be reduced, leading to improvement in assembling and cost reduction. Is.

  The electric blower which concerns on 5th invention is provided with the electric blower of any one of Claims 1-4, and can provide the vacuum cleaner provided with high durability and reliability.

  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)
About the electric blower in the first embodiment of the present invention,
1453443923673_0
This will be described with reference to. FIG. 1 is a half sectional view of the electric blower according to the present embodiment, FIG. 2 is a perspective view of the electric blower, FIG. 3 is an enlarged view of the vicinity of the power supply terminal of the electric blower, and FIG. It is an external view of the shielding board to mount | wear.

  1 and 2, the electric blower 1 according to the present embodiment includes an electric motor 2, an impeller 4, a diffuser 5, and a fan case 8. The impeller 4 is provided at one end of a shaft 3 that is an output shaft of the electric motor 2 and has a plurality of blades 4a. The diffuser 5 is provided on the outer periphery of the impeller 4 and includes a plurality of stationary blades (not shown) that rectify the wind discharged from the impeller 4. The fan case 8 covers the impeller 4 and the diffuser 5 and has an air inlet 7 at the center.

  The electric motor 2 includes a field unit 14 and an armature unit 18 disposed inside the field unit 14.

  First, the configuration of the field unit 14 will be described. An insulating material (not shown) between the field core 9 and the field winding 11 and a base for winding the field winding 11 are formed on the field core 9 formed by laminating a plurality of electromagnetic steel plates. A reel 10 is attached. A field winding 11 is wound around the winding frame 10. One end of the field winding 11 is connected to a carbon brush (not shown), and the other end is connected to the power supply terminal 12. The power terminal 12 is inserted into a terminal block 13 provided on the reel 10.

  Next, the configuration of the armature unit 18 will be described. The armature core 16 is disposed inside the field unit 14 and houses the armature winding 15 in a slot (not shown). Furthermore, the armature core 16 is composed of a laminated core. The armature unit 18 includes a shaft 3 that is provided at the center of the armature core 16 and serves as an output shaft, and a commutator 17 that is provided at one end of the shaft 3.

  The field unit 14 is press-fitted and fixed to the inner wall of a bottomed cylindrical bracket B19 having a flange portion 19a so that the power terminal 12 side becomes the impeller 4 side. The armature unit 18 is held by a bracket B19 so as to be rotatable via a bearing 20, and after the cooling guide 23 is disposed on the flange portion 19a of the bracket B19, the armature unit 18 is closed by the bracket A6.

  Further, the bracket B19 is provided with an exhaust port 21 serving as an outlet for air sucked from the intake port 7 and an opening 22 for exposing the power supply terminal 12. Further, a shielding plate 24 is provided around the power supply terminal 12 so as to close most of the opening 22 from the inside.

  Next, the structure around the power supply terminal 12 will be described in detail with reference to FIGS.

FIG. 3 shows a configuration around the power supply terminal 12 when the fan case 8, the impeller 4, the diffuser 5, the bracket A6, and the armature unit 18 are removed. FIG. 4 is a detailed view of the shielding plate 24. The power supply terminal 12 is inserted into a terminal block 13 formed integrally with the winding frame 10, and the tip thereof is bent 90 degrees and exposed outward from the opening 22 of the bracket B 19.

  Side walls 25 extend from both sides of the terminal block 13, and the ends thereof are bent toward the bracket B <b> 19. A shielding plate 24 made of an insulating material is inserted between the end of the side wall 25 and the bracket B19 to close the side surface of the opening 22. The opening 22 located in the flange portion 19a is closed when the cooling guide 23 is disposed.

  The operation and action of the electric blower in the present embodiment configured as described above are as follows.

  When the electric blower 1 is operated, a voltage is applied to the electric motor 2 from the power supply terminal 12. The field winding 11, the carbon brush, the commutator 17, and the armature winding 15 are energized in this order. The armature unit 18 is rotated by the action of the magnetic field generated by the field winding 11 and the current flowing through the armature winding 15. In conjunction with the operation of the electric motor 2, the impeller 4 connected to the shaft 3 also rotates.

  Then, due to the rotating action of the impeller 4, the vicinity of the air inlet 7 becomes a negative pressure with respect to the outside air and sucks air. The sucked air passes between the impeller 4, the diffuser 5, the bracket A 6 and the cooling guide 23, passes through the bracket B 19 of the electric motor 2, and cools the field unit 14, the armature unit 18, the carbon brush, the bearing 20, and the like. However, it is finally discharged from the exhaust port 21 to the outside of the electric blower 1.

  A part of the air passes through the impeller 4 and the diffuser 5, passes between the bracket A 6 and the cooling guide 23, and is discharged from the opening 22 to the outside of the electric blower 1 as it is. However, in the present embodiment, since the shielding plate 24 that narrows the ventilation cross section of the opening 22 exists, the amount of air discharged from the opening 22 is drastically reduced. As a result, the amount of air flowing inside the electric motor 2 is increased, and the components such as the commutator 17, the carbon brush, the armature winding 15, and the field winding 11 are efficiently cooled, and the temperature rise can be suppressed. This leads to a reduction in the temperature of the entire motor 2.

  Furthermore, when the temperature of the electric motor 2 is lowered, the efficiency of the electric motor 2 is improved, the durability of the carbon brush is improved, and the abnormal spark is suppressed by reducing the thermal stress of the commutator 17. Can be improved.

(Embodiment 2)
FIG. 5 is an internal configuration diagram of the field unit, bracket B, and bracket A (only the ribs on the back surface are described) of the electric blower according to Embodiment 2 of the present invention. In addition, the same code | symbol is attached | subjected about the same component as the electric blower in said 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 5, the electric blower according to the present embodiment closes the return passages 26a formed by a plurality of return passage ribs 26 arranged on the back surface of the bracket A6 and the adjacent return passage ribs 26 at the outer periphery. And a second closing rib 28 that extends vertically from the back surface of the bracket A6 and closes the opening 22 in the vicinity of the power supply terminal 12. The shape and role of the second closing rib 28 are the same as those of the shielding plate 24 of the electric blower 1 in the first embodiment.

Since the electric blower 1 in the present embodiment is configured as described above, the amount of air flowing through the electric motor 2 increases, and each of the commutator 17, the carbon brush, the armature winding 15, the field winding 11, etc. The temperature rise of the parts can be suppressed, and the temperature of the entire motor 2 is reduced. Further, when the temperature of the electric motor 2 is lowered, the efficiency of the electric motor 2 is improved, the durability of the carbon brush life is improved, and abnormal sparks are suppressed by reducing the thermal stress of the commutator 17. Will improve.

  Moreover, if the electric blower 1 in the said Embodiment 1 or 2 is mounted in a vacuum cleaner (not shown), the vacuum cleaner provided with high durability and reliability can be provided.

  As described above, the electric blower according to the present invention reduces temperature rise and improves durability and reliability, and is not limited to a vacuum cleaner, and is used for household appliances, industrial equipment, and the like that use an electric blower. Is also widely applicable.

DESCRIPTION OF SYMBOLS 1 Electric blower 2 Electric motor 3 Shaft 4 Impeller 5 Diffuser 6 Bracket A
7 Inlet 8 Fan Case 9 Field Core 10 Winding Frame 11 Field Winding 12 Power Terminal 13 Terminal Block 14 Field Unit 15 Armature Winding 16 Armature Core 17 Commutator 18 Armature Unit 19 Bracket B
19a Flange portion 20 Bearing 21 Exhaust port 22 Opening portion 23 Cooling guide 24 Shield plate 25 Side wall 26 Return passage rib 27 First closing rib 28 Second closing rib (shielding plate)

Claims (3)

A winding frame made of an insulating material is provided on both end faces of the field core, and a terminal block for inserting a power supply terminal is provided on one winding frame, and one end of the field winding wound around the winding frame A field unit connected to the power supply terminal, an armature core with armature winding and an armature unit in which a commutator is press-fitted into the shaft, and one end of the shaft are rotatably supported, An electric motor in which an open end of a bottomed cylindrical bracket B enclosing the field unit and the armature core is closed by a bracket A, and the bracket A is directly connected to the other end of the shaft. An impeller that generates an air current, a diffuser that guides the air current from the impeller into the electric motor, a fan case that covers the impeller and the diffuser, and a pair of carbon brushes that supply power to the commutator. In the blower, the commutator, the carbon brush, and the power terminal are positioned in the vicinity of the bracket A, and an exhaust port that discharges air after cooling the electric motor in the vicinity of the bottom surface of the bracket B is provided on the bracket A. An opening for supplying power to the power supply terminal is provided in the vicinity, a shielding plate made of an insulating material that closes most of the opening is provided , and the shielding plate is disposed between the winding frame and the bracket B. An electric blower characterized in that it is sandwiched . The electric blower according to claim 1, wherein the shielding plate is arranged inside the opening. Vacuum cleaner having an electric blower according to any one of claims 1-2.

Images