JPH0519599Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electric blower comprising an electric motor and a blower fan attached to the output shaft of the electric motor.

[Prior Art] An electric blower used for cooling equipment, etc. is composed of an electric motor and a blower fan attached to the output shaft of the electric motor. In many cases, the output shaft of the electric motor is supported by an oil-impregnated alloy metal bearing held in a bearing holder provided on the end cover of the motor, and a blower fan such as a cross-flow type is attached to the output shaft of the electric motor that protrudes from the bearing holder. Installed.

[Problem to be solved by the invention] When an electric blower uses an electric motor whose output shaft is supported by a bearing made of oil-impregnated alloy metal, oil or oil-impregnated alloy metal adheres to the output shaft when the output shaft rotates. Oil spilled from the tank was scattered due to centrifugal force, polluting the surrounding area.

The object of the present invention is to provide an electric blower in which a blower fan is attached to the output shaft of an electric motor that is supported by an oil-impregnated alloy metal bearing held in a bearing holder and protrudes from the bearing holder. The purpose is to prevent oil spilled from the metal from scattering.

[Means for Solving the Problems] In the present invention, in order to achieve the above object, a collar is fitted and fixed to a portion of the output shaft of the electric motor located between the bearing holder and the blower fan. The collar is placed at a distance from the bearing holder, and a plate-shaped slinger (oil cutting member) made of an oil-absorbing material is installed between the output shaft collar and the bearing holder.
Loosely fit so that it can move freely in the axial and circumferential directions.

[Operation of the invention] As described above, when a collar is fitted onto the output shaft of an electric motor and a slinger made of an oil-absorbing material is placed between the collar and the bearing holder, the oil adhering to the output shaft and Since the oil flowing out from the oil-impregnated alloy metal can be absorbed by the slinger, it is possible to eliminate the risk of the oil scattering due to centrifugal force and contaminating the surrounding area.

Further, as described above, when the slinger is loosely fitted to the output shaft while being movable in the axial direction and the circumferential direction, the slinger can be freely moved in the axial direction and the circumferential direction within the range regulated by the collar. Therefore, the slinger can be prevented from becoming a substantial load on the electric motor, and the mechanical torque loss caused by attaching the slinger can be kept to a small level.

[Embodiments] Examples of the present invention will be described below with reference to the accompanying drawings.

The drawing shows the main parts of an embodiment of the present invention. In the drawing, 1 is a fan case, and 2 is a rectangular electric motor fixed to one end wall of the case 1. The electric motor 2 includes a stator 5 configured by winding an armature coil 4 around an armature core 3, end covers 8 and 9 fixed to both ends of the armature core 3 with screws 6 and 7, and end covers 8 and 9. Annular bearing holder 8a provided in each of 9
and an output shaft 1 rotatably supported by an oil-impregnated alloy metal bearing (not shown) held in 9a.
0 and an output shaft 10 disposed inside the stator 5.
It consists of a rotor (not shown) attached to the rotor. The electric motor 2 is fixed to the case with screws 6 with a bearing holder 8a provided on one end cap fitted into a through hole provided on the end wall of the case 1, and the motor 2 is fixed to the case with a screw 6. A blower fan 11 is attached to the output shaft 10 that protrudes inward.
is installed. The blowing fan 11 includes a pair of end plates 13, 13 that face each other in the axial direction at both ends of a large number of blowing blades 12, 12, . . . arranged side by side in the circumferential direction.
(Only one end plate is shown in the figure.) A cross-flow type fan supported by one end plate 13
A boss 14 attached to the center of the output shaft 10 is fitted and fixed to the output shaft 10.

The blower fan 11 may be supported by the output shaft 10 in a cantilevered manner, and may also be supported by the end plate 1 on the other side (not shown).
3 may also be provided with a rotating shaft, and the rotating shaft may be supported by a bearing provided at the other end of the case 1. A blower fan 11 is mounted on the peripheral wall of the fan case 1.
A ventilation window 1a is provided for discharging the air blown by.

The present invention provides an electric blower as described above.
A resin collar 15 is located between the blower fan 11 of the output shaft 10 and the bearing holder 8a.
are fitted and fixed in a light press-fit state, and a slinger 16 is loosely fitted to a portion located between the collar 15 of the output shaft 10 and the bearing holder 8a.

The slinger 16 is made of a material that absorbs oil well, such as urethane foam or felt, and is shaped like a disk. A hole through which the output shaft 10 loosely passes is provided in the center of the slinger, and the output shaft 10 is loosely fitted into the hole. Further, the collar 15 is arranged at a predetermined distance from the bearing holder 8a so as to form a sufficient gap between the collar 15 and the bearing holder 8a to allow movement of the slinger.

In this embodiment, when the output shaft 10 of the electric motor rotates, the blower fan 11 rotates, and air is blown from the blower window 1a. At this time, the slinger 16 is connected to the output shaft 10.
It freely moves in the axial direction and circumferential direction of the output shaft 10 within the range regulated by the collar 15 without rotating integrally with the output shaft 10 . The oil attached to the output shaft 10 and the bearing holder 8 due to this slinger
The oil flowing out from the oil-impregnated alloy metal held in a is absorbed. Therefore, it is possible to prevent oil from scattering due to centrifugal force.

[Effects of the invention] As described above, according to the invention, a slinger made of an oil-absorbing material is arranged on the output shaft of an electric motor to remove oil adhering to the output shaft and oil flowing out from the oil-impregnated alloy metal. Since the oil can be absorbed by the slinger, there is no risk of the oil scattering due to centrifugal force and staining the surrounding area.

Further, according to the present invention, since the slinger is loosely fitted to the output shaft while being movable in the axial direction and circumferential direction, the slinger can be prevented from becoming a substantial load on the electric motor, and the slinger can be moved freely in the axial and circumferential directions. This prevents significant mechanical torque losses from occurring.

[Brief explanation of the drawing]

The drawing is a partially sectional front view of a main part of an embodiment of the present invention. 1...Fan case, 2...Electric motor, 8...Output shaft, 11...Blower fan, 15...Color, 1
6...Slinger.

Claims (1)

[Claims for Utility Model Registration] An electric blower in which a blower fan is attached to the output shaft of an electric motor supported by an oil-impregnated alloy metal bearing held in a bearing holder and protruding from the bearing holder, the fan being spaced apart from the bearing holder. a collar disposed at a position between the bearing holder of the output shaft and the blower fan, and a collar made of an oil-absorbing material and connected between the collar of the output shaft and the bearing holder; 1. An electric blower comprising a plate-shaped slinger that is loosely fitted in an axially and circumferentially movable state in a portion located in between.