JP2680612B2 - Electric blower - Google Patents

Description

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

(B) Conventional Technology As a technology prior to the present invention, Japanese Utility Model Publication No. 61-10459 discloses that a diff user, in which a bearing bearing for a rotor shaft of a motor is directly fitted and attached, is directly attached to a motor case. An electric blower is shown.

However, the Diff user of such an electric blower is usually made of resin, and the coefficient of thermal expansion between the bearing bearing, which has the highest temperature during the operation of the electric blower, and the bearing bearing mating part of the Diff user is greatly different. However, there is a drawback that the gap between the outer peripheral portion of the bearing bearing and the bearing fitting portion of the Diff user becomes large to cause a creep phenomenon in which the outer peripheral portion of the bearing bearing rotates, which significantly deteriorates the quality of the electric blower.

Therefore, the applicant has proposed an electric blower in which a bearing bearing is fitted and fixed to a bearing mounting frame made of a metal material, and the mounting frame is screwed to a synthetic resin diff user (Japanese Patent Application No. 2003-242242). If a large-capacity electric blower is used for this type as well, the heat generated by the motor will increase, and due to repeated large temperature changes during use and when not in use, the screw will not reach the Diff user. There is a drawback that the tightened state becomes loose and the mounting state of the mounting frame body to the diff user becomes unstable, and the vibration of the motor increases to generate noise or malfunction.

(C) Problems to be Solved by the Invention The present invention has been made to solve the above-mentioned drawbacks, and has a simple structure and prevents the bearing from being loosely attached to a synthetic resin diff user for a long period of time. The purpose is to obtain an electric blower that does not generate vibration or noise and can be used without failure.

(D) Means for Solving the Problems The electric blower of the present invention has a stator and a synthetic resin diffuser having a central bearing hole in which a bearing bearing is mounted and a large number of ventilation guide vanes formed on the back surface. A cylindrical motor case having an opening at one end fixed to the back surface of the diffuser, and a rotor rotatably supported in the motor case so that the tip of the rotating shaft projects to the surface of the diffuser through the bearing bearing. And a centrifugal fan that is located on the surface side of the diffuser and is attached to the rotary shaft, and a fan cover that covers the centrifugal fan and is fixed to the motor case. Insert the metal bearing mounting frame that forms the cylinder and the flange piece into the center bearing hole. So that it is positioned in the diffuser, a metal supporting plate is arranged on the mounting frame body mounting side of the diffuser, and the flange piece of the bearing mounting frame body and the metal supporting plate are tightened and fixed by a tightening screw to mount the bearing. It is characterized in that the bearing press-fitting cylinder of the frame is brought into contact with the metal supporting plate.

(E) Operation With the above-described configuration, in the metal bearing mounting frame body in which the bearing bearing is press-fitted and fixed in the bearing press-fitting cylinder, the collar piece of the mounting frame body and the metal support plate sandwich the synthetic resin diff user. It is attached to the Diff user in a state of being embedded, and in this state, the collar piece and the support plate are pressed against the Diff user, and the bottom surface of the bearing press-fitting cylinder is also pressed against the support plate.

The rotor supported by the bearing rotates a centrifugal fan at a high speed, and the air sucked therein flows into the motor case under the guidance of the differential user, cools the rotor and the stator, and then flows outside the motor case. Exhausted.

Since the bearing bearing that rotatably supports the rotor and the bearing mounting frame body that press-fits and fixes the bearing bearing are both made of a metal material, the thermal expansion coefficients of the two become substantially the same, and the bearing bearing is heated to a high temperature by the rotation of the rotor. Even if it becomes, the state of press-fitting fixing of the outer peripheral portion of the bearing to the bearing mounting frame does not change, and the creep phenomenon of the bearing does not occur. Further, since the bearing mounting frame body is mounted on the Diff user with the metal support plate sandwiching the Diff user, even if the bearing mounting frame body and the metal support plate become high in temperature, Even if the temperature change with the low temperature state is repeated, the tightening force for the diff user does not decrease,
The mounting state of the bearing mounting frame to the Diff user does not loosen. Further, the heat generated in the bearing bearing is transferred to the bearing mounting frame and the metal supporting plate and radiated in a large heat radiation area, so that the cooling efficiency of the bearing is improved.

(F) Example Hereinafter, the configuration of the electric blower of the present invention will be described with reference to FIGS. 1 to 6.

1 is a metal cylindrical motor case of the electric blower 2,
A flange portion 4 is formed at one end opening portion 3 which is open toward one side, an exhaust port 5 is bored in the rear portion of the cylindrical peripheral surface, and a bearing recess 6 is provided in the bottom surface.
Reference numeral 7 denotes a substantially square motor stator press-fitted and fixed in the motor case 1, and a cooling space 8 is formed between an outer peripheral wall of the stator 7 and an inner wall of the motor case 1. Reference numeral 9 denotes a disc-shaped synthetic resin diff user disposed in the opening 3 at one end of the motor case 1,
The surface 10 of the diff user 9 is formed in a flat plate shape, and a support plate fitting recess 11 is formed on the surface 10 side, and a central bearing hole 12 is formed in the center portion of the fitting recess 11. Is a screw through hole
13 are drilled respectively. See also Diff User 9
A plurality of inclined wing portions 15 ... Inclining from the front surface 10 side toward the rear surface 14 side are formed at predetermined intervals at the outer peripheral edge thereof. Then, the suction opening formed by the inlet side blade edge 15a ... And the side wall 15b ...
It has 16 ... Also, the back side 14 of the Diff user 9
A plurality of ventilation guide vanes 17 extending from the suction opening 16 toward the central bearing hole 12 and curved in an arc are formed in a substantially parallel shape, and the adjacent ventilation guide vanes 17 ...
Ventilation passages 18 are formed between them, and the ventilation passages 18 communicate with the suction openings 16 through the inner end portions of the inclined blade portions 15. Further, a plurality of supporting ribs 19 ... Entering into the motor case 1 are provided at a portion of the rear surface 14 of the Diff user 9 corresponding to the one end opening 3 of the motor case 1.
The ventilation guide blades 17 are provided so as to extend. Further, the inclined wings 15 of the diff user 9 are provided with mounting holes 21 for fixing and fixing the screws 20 to the flange portion 4.

22 is a metal bearing mounting frame body for mounting the bearing bearing 23 in the central bearing hole 12 of the Diff user 9,
A metal plate material is drawn to form a bearing press-fitting cylinder 24 having a shaft through hole 25 in the bottom surface 24a, and a pair of collar pieces 26, 26 is formed on the peripheral edge of the press-fitting cylinder 24. The bearing bearing 23 is press-fitted and fixed to the cylinder 24.

Reference numeral 27 denotes a metal supporting plate formed by punching a thin metal plate to mount the bearing mounting frame 22 on the differential user 9, and has a shaft hole 28 and a screw hole 29 facing the central bearing hole 12. ing.

And the bearing press-fitting cylinder of the bearing mounting frame 22
24 is positioned so as to enter the central bearing hole 12 from the rear surface 14 side, and the collar piece 26 is brought into contact with the rear surface 14 side which is the mounting frame body mounting side of the Diff user 9, and the metal support plate 27 is fixed to the disk. The surface opposite to the mounting side of the mounting frame of the fuuser 9.
It is fitted into the support plate fitting recess 11 on the 10 side, and the tightening screw 30 is passed from the screw hole 29 of the metal support plate 27 through the screw through hole 13 of the differential user 9 to the bearing mounting frame body 22 and the collar piece 26. The flange piece 26 of the bearing mounting frame 22 and the metal supporting plate 27 are integrated with each other by tightening the screw tightening holes 31 in the state where the differential user 9 is sandwiched. At this time, the collar piece 26 and the supporting plate 27 are pressed against the differential user 9, and the bottom surface 24a of the bearing press-fitting cylinder 24 is also pressed against the supporting plate 27.

Reference numeral 32 denotes a rotor arranged in the inner space of the stator 7 in the motor case 1, and a rotary shaft 33 of the rotor 32 has a bearing bearing 23 attached to the differential user 9 and a bearing recess of the motor case 1. 6 is rotatably supported by a bearing bearing 34 press-fitted in 6, and the tip of the rotary shaft 33 projects toward the surface 10 of the differential user 9.

A centrifugal fan 35 is attached to the tip of the rotary shaft 33 and is arranged on the surface 10 side of the differential user 9.

Reference numeral 36 denotes the motor case 1 which covers the centrifugal fan 35.
This is an arm-shaped fan cover fixed to the outer periphery of the flange portion 4, and has a suction port 37 formed in the center of the front surface thereof.

When the electric blower 2 is driven by the above configuration, the rotor
32 rotates at high speed, which causes centrifugal fan 35 to rotate at high speed. Then, air is sucked from the suction port 37 of the fan cover 36 and discharged from the outer periphery of the centrifugal fan 35. After that, the discharged air passes from the intake opening 16 of the diff user 9 through the inclined wing portions 15 and the ventilation passages 18 formed by the ventilation guide vanes 17 of the rear surface 14 of the diff user 9. And is guided into the motor case 1 by being divided into two parts, and further, in the motor case 1, the support ribs 19 allow the air flows to pass through the cooling space 8 and the gap between the rotor 32 and the stator 7 without being mixed with each other. To cool the rotor 32 and the stator 7 and then to be discharged from the exhaust port 5 to the outside of the motor case 1, so that the motor part can be efficiently cooled without generating turbulent flow in the motor case 1 and the suction performance can be improved. You can

Further, since the bearing bearing 23 that pivotally supports the rotary shaft 33 of the rotor 32 and the bearing mounting frame 22 that press-fits and fixes the bearing bearing 23 in the bearing press-fitting cylinder 24 are both made of a metal material, The coefficients of thermal expansion of both are almost the same. Therefore, even if the bearing bearing 23 becomes hot due to the high speed rotation of the rotor 32, the press-fitting fixed state of the outer peripheral portion of the bearing bearing 23 with respect to the bearing press-fitting cylinder 24 does not change,
The creep phenomenon of the bearing bearing 23 does not occur, and the mounting state of the bearing bearing 23 does not loosen. The bearing mounting frame 22 is fixed to the synthetic resin diff user 9 by tightening the tightening screw 30 with the metal support plate 27 sandwiching the diff user 9. Even if the mounting frame body 22 and the metal supporting plate 27 become high in temperature, or the temperature change between the high temperature state and the low temperature state is repeatedly caused by driving / stopping the electric blower 2, the differential user of the bearing mounting frame body 22 The tightening force for the bearing mounting frame body 22 does not decrease.
The attachment state of the above to the Diff user 9 does not loosen. Therefore, the bearing state of the rotor 32 with respect to the bearing bearings 23 and 34 is always kept stable, and lateral shake does not occur due to the high speed rotation of the rotor 32.

Further, the heat generated in the bearing bearing 23 is transferred to the metal supporting plate 27 via the bottom surface 24a of the bearing press-fitting cylinder 24, and is radiated from the bearing mounting frame 22 and the metal supporting plate 27, so that the cooling efficiency of the bearing bearing 23 is improved. Will be good.

Further, since the central bearing hole 12 of the differential user 9 is closed by the metal support plate 27, the air guided to the rear surface 14 side of the differential user 9 flows back to the front surface 10 side through the central bearing hole 12. The suction performance does not deteriorate.

Moreover, by attaching a synthetic resin diff user 9 to the opening 3 at one end of the motor case 1, the conventional metal plate motor frame is abolished and the rotor 32 is securely pivotally supported. Since 9 is made of lightweight synthetic resin, the weight of the electric blower 2 itself is also reduced.

(G) Effect of the Invention The present invention is configured as described above, and in particular, a metal bearing mounting frame body in which a bearing bearing is press-fitted and fixed, and a metal support plate sandwiches a synthetic resin diff user. Since the bearing mounting frame is attached to the Diff user, even if the bearing bearing, the bearing mounting frame and the metal supporting plate become high in temperature due to the high speed rotation of the rotor, or the electric blower is driven / stopped, the high temperature state occurs. Even if the temperature change in the low temperature state is repeated, the mounting state of the bearing mounting frame body to the differential user does not loosen.

Further, since both the bearing mounting frame and the bearing bearing are made of a metal material, the thermal expansion coefficients of both are approximately the same, and even if the bearing bearing becomes hot, it is press-fitted and fixed to the bearing mounting frame of the bearing bearing. The state does not change, so the bearing bearing creep phenomenon does not occur,
The bearing is not loosely attached to the bearing mounting frame.

Therefore, the mounting state of the bearing bearing on the differential user does not loosen for a long period of time, the bearing state of the rotor is always kept stable, the side shake of the rotor does not occur, and vibration and noise do not occur for a long period of time. It is possible to obtain an electric blower that can be used without failure.

Further, since the bottom surface of the bearing press-fitting cylinder of the bearing mounting frame is in pressure contact with the metal supporting plate, the heat generated in the bearing bearing is transferred to the bearing mounting frame and the metal supporting plate to be dissipated in a wide heat dissipating area. The cooling efficiency of the bearing is improved.

[Brief description of the drawings]

Each of the drawings relates to an embodiment of the electric blower of the present invention, FIG. 1 is a partial cross-sectional side view, FIG. 2 is a front view of a diff user with a bearing mounting frame mounted, and FIG. 3 is a rear view thereof. 4 is a rear view of a diff user, FIG. 5 is a front view of a bearing mounting frame, and FIG. 6 is a front view of a metal supporting plate. 1 ... Motor case, 9 ... Synthetic resin diff user, 12 ... Central bearing hole, 22 ... Bearing mounting frame, 23
…… Bearing bearing, 24 …… Bearing press fitting cylinder, 26 ……
Collar piece, 27 …… metal support plate, 30 …… tightening screw, 32 …… rotor, 35 …… centrifugal fan, 36 …… fan cover.

Claims (1)

(57) [Claims] 1. A diffuser made of synthetic resin having a central bearing hole in which a bearing bearing is mounted and a large number of ventilation guide vanes formed on the back surface, and a stator built in and one end opening fixed to the back surface of the diffuser. A cylindrical motor case, a rotor rotatably supported in the motor case so that the tip of the rotating shaft projects to the rear surface of the diffuser through the bearing bearing, and the rotor positioned on the front surface side of the diffuser to rotate. A centrifugal fan mounted on a shaft and a fan cover that covers the centrifugal fan and is fixed to the motor case. A bearing press-fitting cylinder for press-fitting and fixing the bearing bearing, and a metal bearing mounting in which a collar piece is formed. Position the frame body on the diffuser so that the press-fitting cylinder fits into the central bearing hole. Together, a metal support plate is arranged on the mounting frame body mounting side of the diffuser, and the flange piece and the metal support plate of the bearing mounting frame body are tightened and fixed by a tightening screw, and the bearing press-fitting cylinder of the bearing mounting frame body is fixed. An electric blower characterized in that the metal support plate and the metal support plate are brought into contact with each other.