JP2013199871A - Electric blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric blower capable of suppressing satisfactorily such an occurrence that the air inside an electric motor part leaks to a fan part through a fan side ball bearing without involving a mechanical loss.SOLUTION: An electric blower includes: a motor case; a motor part M furnished with a stator 11 and a rotor 15 installed together with it in the motor case; a fan 31 coupled with the rotor shaft 16 of the rotor 15; and a fan part F having a fan cover installed in the motor case in such a way as to cover the fan 31. The rotor shaft 16 is supported by a ball bearing 7 arranged in a bearing housing 4a formed in the motor case. The fan side portion of the rotor shaft 16 penetrates the ball bearing 7, and a slinger 19 covering the ball bearing 7 from inside the motor part M is mounted on the rotor shaft 16 in such a manner as to rotate in a single piece with the shaft 16. The ball bearing 7 penetrated by the rotor shaft 16 has an inner ring 8 and an outer ring 9 and the slinger 19 is furnished with a vane 20 to form an air stream to suck out the air in the space 8 between the inner and outer rings 8 and 9 into the motor part M.

Description

  Embodiments of the present invention relate to an electric blower provided in, for example, a vacuum cleaner.

  The electric blower includes an electric motor part and a fan part, and is configured to air-cool the electric motor part by rectifying the air discharged from the fan of the fan part with a diffuser and circulating the air in the electric motor part.

  The rotor shaft of the rotor of the electric motor unit is supported by ball bearings. Since the fan part side portion of the rotor shaft passes through a ball bearing disposed on the fan part side, the motor part and the fan part are communicated with each other through the ball bearing on the fan part side.

  Since the air in the gap formed between the fan and the diffuser in the fan section is sucked by the flow of air discharged from the fan, the pressure in the gap becomes lower than the atmospheric pressure accordingly. On the other hand, the pressure inside the electric motor section is close to the atmospheric pressure. Due to such a pressure difference, the air in the motor part is sucked into the gap of the fan part through the ball bearing on the fan part side.

  Thus, if there is an air leak (leak) passing through the fan part side ball bearing, the following problems are brought about. 1stly, since a part of air in an electric motor part circulates over an electric motor part and a fan part as a cause of the said leak, the ventilation efficiency of an electric blower falls. Secondly, the air sucked into the electric blower contains fine dust. At the same time, when the motor unit includes a commutator, the carbon brush wear powder in contact with the commutator is included in the air in the motor chamber. As the dust and wear powder adhere to the inside of the fan-side ball bearing due to the leak, the life of the ball bearing may be reduced.

  In order to suppress such a leak in the fan part side ball bearing, a ball bearing with a seal member may be used for the fan part side ball bearing. A ball bearing with a seal member is provided with seal members at both end portions in the thickness direction, and these seal members are configured to close a bearing inner gap formed between the inner ring and the outer ring.

  In order to ensure sufficient sealing performance in this ball bearing, the inner periphery of the seal member is held in contact with the inner ring, and the outer periphery of the seal member is held in contact with the outer ring. Need to be. However, in such a configuration, it is undeniable that the mechanical loss associated with the sliding contact between the seal member and the inner ring or the outer ring is caused and the efficiency of the electric blower is lowered.

  Therefore, generally, the seal member is not completely closed with the seal member, but the seal member is disposed in a state of being in slight contact with the inner ring or the outer ring. However, such an electric blower provided with a ball bearing having an imperfect seal is not sufficient to eliminate the above-mentioned problems.

JP 2002-147388 A

  An embodiment is to provide an electric blower capable of sufficiently suppressing air in an electric motor part from leaking to a fan part through a fan part side ball bearing without causing mechanical loss.

  In order to solve the above-described problems, an electric blower according to an embodiment includes an electric motor case and an electric motor unit including a rotor disposed therein together with a stator, a fan connected to a rotor shaft of the rotor, and an electric motor covering the fan. A fan unit having a fan cover attached to the case is provided. The rotor shaft is supported by a ball bearing disposed in a bearing housing portion formed in the motor case. A slinger that covers the ball bearing through which the fan shaft side portion of the rotor shaft passes is attached to the rotor shaft so as to rotate integrally with the shaft. The slinger is provided with blades that form an air flow for sucking air between the inner ring and the outer ring of the ball bearing through which the rotor shaft has passed into the electric motor part.

It is sectional drawing which shows the electric blower which concerns on 1st Embodiment. It is sectional drawing which expands and shows a part of electric blower of FIG. It is a perspective view which shows the rotor with which the electric blower of FIG. 1 is provided. It is a perspective view which shows the slinger with which the rotor of FIG. 3 is provided. It is sectional drawing which expands and shows a part of electric blower concerning 2nd Embodiment. It is sectional drawing which expands and shows a part of electric blower concerning 3rd Embodiment. It is a perspective view which shows the rotor with which the electric blower of FIG. 6 is provided. It is a perspective view which shows the slinger with which the rotor of FIG. 7 is provided.

  Hereinafter, the electric blower of 1st Embodiment is demonstrated in detail with reference to FIGS. 1-4.

  Reference numeral 1 in FIG. 1 denotes an electric blower that is built in a vacuum cleaner body of a vacuum cleaner (not shown) and performs a blowing operation for forming an air flow for dust absorption. The electric blower 1 includes an electric motor part M and a fan part F.

  The motor unit M is, for example, a commutator motor, and includes the motor case 2, the stator 11, the rotor 15, and a pair of brush devices (not shown). The motor unit M may be a brushless motor. The fan unit F includes a fan 31, a diffuser 41, and a fan cover 45.

  The motor case 2 is formed by connecting a case end face plate 4 to a case body 3.

  The case body 3 made by drawing a metal plate is formed in a bottomed cylindrical shape having one end opened and the other end closed by an end wall 3a, and the opening edge 3b of the one end has an annular shape. Projecting outward. A first bearing housing portion 3 c is formed at the center of the end wall 3 a so as to protrude outside the motor case 2. The first bearing housing part 3 c is open to the inside of the case body 3. The first ball bearing 5 is press-fitted and the preload spring 6 is accommodated in the first bearing housing portion 3c. The preload spring 6 biases the inner ring of the first ball bearing 5 toward the fan part F side.

  The case end face plate 4 made by press-molding a metal plate extends in the front and back direction of the paper surface on which FIG. 1 is drawn, crosses the opening of the case main body 3 in the radial direction, and both end portions thereof are the opening edges 3b. It is screwed. The case end face plate 4 has a circular vent hole (not shown) opened between the center portion and both end portions. The electric motor case 2 communicates with the inside of the fan part F through an opening left between the case main body 3 and the case end face plate 4 and a vent hole of the case end face plate 4.

  The case end face plate 4 has a second bearing housing portion 4 a that protrudes outside the electric motor case 2 at the center in the longitudinal direction. The second bearing housing portion 4a is opened in the electric motor case 2 and protrudes opposite to the first bearing housing portion 3c. The end wall (the upper wall in FIGS. 1 and 2) of the second bearing housing portion 4a has a through hole 4b (see FIG. 2) at the center thereof.

  As shown in FIGS. 1 and 2, the case end face plate 4 has an annular edge portion 4c that borders the opening of the second bearing housing portion 4a. The annular edge 4 c protrudes into the electric motor case 2 with respect to the central portion 4 d in the longitudinal direction of the case end face plate 4. The cross-sectional shape of each part of the annular edge 4c is semicircular. The central part 4d of the case end face plate 4 is a part projecting integrally around the annular edge part 4c, that is, a part continuous to the opposite side of the second bearing housing part 4a with the annular edge part 4c as a boundary.

  A second ball bearing 7 is press-fitted inside the second bearing housing portion 4a. As shown in FIG. 2, the second ball bearing 7 includes an inner ring 8, an outer ring 9, and a plurality of steel sandwiched between the inner ring 8 and the outer ring 9 disposed in a bearing inner gap 7 a formed therebetween. It has a ball 10 and a steel ball holder (not shown) that is disposed in the bearing gap 7a and positions each steel ball 10 within the bearing gap 7a, and is not shown in the bearing gap 7a. Contains grease. The configuration of the second ball bearing 7 is general, and the configuration of the first ball bearing 5 is the same. With the press-fitting, the outer periphery of the outer ring 9 of the second ball bearing 7 is brought into close contact with the inner periphery of the second bearing housing part 4a, so that the outer ring 9 is held by the second bearing housing part 4a so as not to rotate. Yes.

  As shown in FIG. 1, the stator 11 includes a stator iron core 12 having a substantially square outer shape in plan view, and a pair of stator windings 13 wound around the iron core. The stator 11 is fixed in the electric motor case 2 with its four corners being in pressure contact with the inner surface of the cylindrical peripheral wall of the case body 3.

  A case internal air passage 2a is formed between the outer surface of the stator iron core 12 and the inner surface of the cylindrical peripheral wall of the case body 3 facing the stator iron core 12. An exhaust portion 14 is provided in the case main body 3 so as to be located downstream of the case internal air passage 2a. The exhaust portion 14 is formed by a plurality of exhaust holes that are located between the stator core 12 and the end wall 3a and are opened in the cylindrical peripheral wall, for example. The in-case air passage 2 a communicates with the opening of the case body 3 and the vent hole of the case end face plate 4 positioned on the upstream side.

  A part of each stator winding 13 protrudes from one end of the stator core 12 toward the fan part F as shown in FIG. The projecting fan-side winding end portions 13a are arranged on both sides in the width direction of the case end face plate 4 with respect to the center portion of the case end face plate 4 and approach the center portion 4d of the case end face plate 4 respectively. It has been.

  As shown in FIGS. 1 and 3, the rotor 15 includes a rotor shaft 16 and an armature core 17 around which an armature winding 17a is wound, and a commutator 25 having a winding terminal of the armature winding 17a connected thereto. It is formed by attaching the slinger 19 together with the attachment. The rotor 15 is mounted in the motor case 2 through the inside of the stator 11 by rotatably supporting both ends of the rotor shaft 16 on the first ball bearing 5 and the second ball bearing 7. Both the inner ring of the first ball bearing 5 and the inner ring 8 of the second ball bearing 7 are in close contact with the outer periphery of the rotor shaft 16. Thereby, the inner ring of the first ball bearing 5 and the inner ring 8 of the second ball bearing 7 are held by the rotor shaft 16 so as not to rotate with respect to the rotor shaft 16.

  As shown in FIG. 4, the slinger 19 has a disk shape, and includes a bearing cover portion 19 a, an end face plate cover portion 19 b, and a plurality of blades 20.

  The bearing cover portion 19a includes an inner peripheral part and an outer peripheral part integrally formed on the inner peripheral part with a first step 19c formed therebetween. The inner peripheral part has a circular mounting hole 19d at the center. The end face plate cover portion 19b is integrally continuous with the outer peripheral portion by forming a second step 19e between the end plate cover portion 19b and the outer peripheral portion. The end face plate cover portion 19b is a portion that covers the annular edge portion 4c of the case end face plate 4 and the central portion 4d that is integrally continuous therearound from the inside of the electric motor portion M. For example, the end edge plate cover portion 19b It is bent and formed according to the shape of the part 4d. Each blade | wing 20 is provided in the end surface board cover part 19b which made | formed the periphery of the slinger 19 at integral intervals along the circumferential direction.

  The slinger 19 having such a configuration can be made of metal or heat-resistant synthetic resin. In the case of metal, each blade 20 may be fixed to the end plate cover portion 19b by welding or the like, and in the case of heat-resistant synthetic resin, each blade 20 may be formed integrally with the end plate cover portion 19b. Is possible.

  As shown in FIG. 2, the attachment hole 19 d of the slinger 19 is fitted to the rotor shaft 16. The slinger 19 is attached to the rotor shaft 16 so as to rotate integrally with the shaft. Therefore, an inner peripheral portion of the bearing cover portion 19 a is sandwiched between the retaining ring 21 and the inner ring 8 by a C-type or E-type retaining ring 21 attached to the rotor shaft 16.

  The slinger 19 attached in this way covers the second ball bearing 7 from the inside of the electric motor part M. More specifically, the bearing cover portion 19a of the slinger 19 covers the second ball bearing 7, and the end face plate cover portion 19b of the slinger 19 approaches the annular edge portion 4a and the central portion 4d of the case end face plate 4 so as to cover them. Covers in a non-contact state.

  As shown in FIG. 2, the inner peripheral portion of the bearing cover portion 19a is in contact with the end surface of the inner ring 8 from the first step 19c, but the outer peripheral portion of the bearing cover portion 19a is in contact with the first step 19c. Accordingly, it is separated from the outer ring 9. At the same time, a gap g narrower than the in-bearing gap 7a is formed between the end face plate cover portion 19b and the center portion of the case end face plate 4 that are separated from each other and face each other. The gap g communicates with the bearing inner gap 7 a on the second ball bearing 7 side, and is opened in the electric motor part M on the opposite side to the second ball bearing 7. Therefore, the inside of the motor part M and the bearing internal gap 7a are communicated via the gap g.

  The slinger 19 faces the armature winding 17a from the fan part F side. Further, each blade 20 of the slinger 19 is provided, for example, outside the gap g and protrudes toward the stator 11. As a result, as shown in FIG. 1, each blade 20 is brought close to each fan end side winding end 13 a of each stator winding 13.

  The pair of brush devices (not shown) penetrates the case main body 3 in the radial direction and is electrically insulated from the case main body 3. The carbon brushes included in these brush devices are pressed against the outer periphery of the commutator 25 by a coil spring.

  The fan 31 of the fan section F is a centrifugal type, and as shown in FIG. 1, a disk-shaped fan base 32 and a disk-shaped front shroud 33 opposed to the fan base 32 are connected to the fan. These are connected by a plurality of blades 34 arranged at regular intervals in the circumferential direction of 31. These members are all made of metal, for example, aluminum. Each blade 34 is provided at right angles to the fan base 32 and the front shroud 33. These blades 34 have a plurality of caulking projections (not shown) on both side edges, and the caulking projections are inserted into the caulking holes provided in the fan base 32 and the front shroud 33, respectively. The fan base 32 and the front shroud 33 are connected to each blade 34 by caulking and crushing. A discharge port 31 a is formed in the peripheral portion of the fan 31. A suction port 31 b is opened at the center of the front shroud 33.

  The fan 31 is fixed to the fan end side shaft end portion of the rotor shaft 16 using a nut 35. The fan shaft side end of the rotor shaft 16 penetrates through the second ball bearing 7, the through hole 4b of the second bearing housing portion 4a, and the center portion of the diffuser 41 described later in the thickness direction, and Projected inside. As shown in FIG. 2, the central portion of the fan base 32 has a three-layer structure, and a ring-shaped distance member 36 is sandwiched between the rear surface thereof and the inner ring 8 of the second ball bearing 7. Therefore, the center portion of the fan base 32 through which the rotor shaft 16 passes and the distance member 36 are sandwiched between the inner ring 8 of the second ball bearing 7 and the nut 35.

  The diffuser 41 is an integrally molded product of a synthetic resin, for example, a nylon resin, and is used for staticizing the airflow discharged from the discharge port 31a of the fan 31 and guiding it to the case internal air passage 2a of the motor case 2. It has been. As shown in FIG. 1, the diffuser 41 includes a disk-shaped diffuser base 41a larger than the diameter of the fan 31, and a plurality of upstream-side stationary blades integrally formed on the peripheral surface of the diffuser base 41a. 41b and a plurality of downstream-side stationary blades 41c having a plurality of substantially arc shapes provided integrally on the back surface of the diffuser base 41a.

  The diffuser 41 has a circular through hole 42 (see FIG. 2) at the center. The diffuser 41 is disposed between the fan 31 and the motor case 2 with the through hole 42 fitted to the outer periphery of the second bearing housing portion 4a. The diffuser 41 is fixed to the case end face plate 4 with a screw (not shown) passed through a screw hole provided at the center of the case end face plate 4 and covers the opening of the case body 3 and the case end face plate 4. .

  The diffuser base 41a of the diffuser 41 faces the back surface of the fan base 32 of the fan 31, and a gap G (see FIGS. 1 and 2) is formed therebetween. The upstream stationary vane 41 b of the diffuser 41 is disposed around the fan 31 and faces the discharge port 31 a of the fan 31. The downstream stationary vane 41 c of the diffuser 41 is opposed to the opening of the case body 3.

  The gap G communicates with the in-bearing gap 7a of the second ball bearing 7 through the through hole 4b of the second bearing housing portion 4a. Further, the gap G is communicated between the discharge port 31a of the fan 31 and the upstream stationary blade 41b surrounding the discharge port 31a.

  The fan cover 45 that guides the airflow discharged from the fan 31 to the diffuser 41 is made of, for example, metal, and has an air inlet 45a facing the air inlet 31b of the fan 31 at the center as shown in FIG. In addition, a stationary blade pressing portion 45b is provided on the peripheral portion. The fan cover 45 is fitted to the opening edge 3 b of the electric motor part M and covers the fan 31 and the diffuser 41 and is attached to the electric motor case 2. The stationary blade pressing portion 45 b sandwiches the peripheral portion of the diffuser 41 between the opening edge 3 b of the case body 3.

  A ring-shaped sealing material 46 is mounted on the back surface of the fan cover 45 so as to surround the air inlet 45a. The sealing material 46 is made of a material having a lower strength than the metal material forming the fan 31, such as a paper material. The edge of the suction port 31 b of the front shroud 33 is in contact with the sealing material 46. Thereby, the space between the front shroud 33 and the fan cover 45 and the suction port 31b of the fan 31 are sealed.

  When power is supplied to the motor part M of the electric blower 1, the fan 31 is rotated together with the rotor 15. Accordingly, air flows through the air inlet 45a of the fan cover 45, the fan 31, the air passage in the diffuser 41, the air passage 2a in the case, and the exhaust portion 14 in this order, and sucks dust in the vacuum cleaner. The air blowing operation is performed.

  In this air blowing operation, a gap communicated between the upstream stationary blade 41b and the discharge port 31a by the flow of air discharged from the discharge port 31a of the fan 31 to the upstream stationary blade 41b of the diffuser 41. G becomes a negative pressure. On the other hand, since the inside of the electric motor part M becomes substantially atmospheric pressure, a pressure difference is generated between the inside of the electric motor part M and the gap G.

  However, a plurality of blades 20 are formed on the slinger 19 that rotates together with the rotor 15. Thereby, the air in the motor part M and in the vicinity of the slinger 19 is blown by the blades 20 as the slinger 19 rotates. In this case, the air is blown in the centrifugal direction of the slinger 19 as indicated by solid arrows in FIG. The rotation direction C of the rotor 15 is indicated by an arrow in FIGS. And since each blade | wing 20 is provided in the peripheral part of the slinger 19, compared with the case where each blade | wing is provided inside the peripheral part of the slinger 19, since a centrifugal force acts largely, it can blow stronger.

The air in the gap g formed between the central portion in the longitudinal direction of the case end plate 4 and the slinger 19 that is approaching the air by the blades 20 of the rotated slinger 19 An air flow (see dotted arrow in FIG. 2) is formed by the blades 20 of the slinger 19. Thereby, the air in the gap g and the air in the bearing gap 7a of the second bearing 7 communicated with the gap g are sucked into the motor part M, and thus sucked into the motor part M from the gap g. The air flow is caused to flow in the opposite direction to the airflow that is about to flow into the gap g and the in-bearing gap 7a of the second ball bearing 7 from the inside of the electric motor part M due to the negative pressure of the gap G.

  Thereby, the pressure difference between the gap G and the inside of the electric motor part M is reduced. Therefore, fine dust (including carbon powder) inside the motor part M is prevented from entering the second ball bearing 7 through the gap g. Therefore, the lifetime of the second ball bearing 7 can be prevented from being reduced.

  In addition, since the fine air does not enter the second ball bearing 7 through the gap g by the air blowing action of the slinger 19 as described above, a high-cost second ball bearing with a seal member is employed. There is no need. In addition, a mechanical loss in the second ball bearing 7 does not increase along with this, so that a reduction in efficiency of the electric blower 1 can be avoided.

  At the same time, the pressure difference becomes small, so that air circulation in the electric blower 1 becomes difficult. That is, a part of the air in the motor part M passes through the second ball bearing 7, circulates through the gap G, merges with the air discharged from the discharge port 31 a of the fan 31, and is blown into the motor part M. Is prevented from repeating the circulation. Therefore, it is possible to suppress a decrease in blowing efficiency.

  In addition, since the fan portion side winding end portion 13a of the stator winding 13 is brought close to the peripheral portion of the slinger 19, the wind formed by the rotation of the slinger 19 blows to the fan portion side winding end portion 13a. You can be put on. Thereby, it is possible to assist the air cooling of the stator winding 13 separately from the airflow that tries to pass through the in-case air passage 2a, and the copper loss of the stator winding 13 can be suppressed. Accordingly, the efficiency of the electric blower 1 can be improved. In addition, since the speed of the airflow blown to the fan part side winding end part 13a is considerably lower than the airflow trying to pass through the air passage 2a in the case, the wind formed by the rotation of the slinger 19 The airflow passing through the inner air passage 2a is not disturbed, and even if it is disturbed, it is negligible.

  FIG. 5 shows a second embodiment. The second embodiment is different from the first embodiment in the configuration described below, and the other configurations are the same as those in the first embodiment. Therefore, the second embodiment has the same or similar functions as the first embodiment. Are denoted by the same reference numerals as in the first embodiment, and description thereof is omitted.

  The electric blower of the second embodiment is different from the first embodiment in the configuration of the end face plate cover portion 19b of the slinger 19 and the arrangement of the plurality of blades 20.

  Specifically, the end face plate cover portion 19b facing the annular edge portion 4c and the central portion 4d of the case end face plate 4 has a flat plate shape. As a result, the gap g between the peripheral portion of the end face plate cover portion 19b, that is, the peripheral portion of the slinger 19 and the central portion 4d of the case end face plate 4 is between the end face plate cover portion 19b and the annular edge portion 4c. In addition to being formed wider, the bearing inner gap 7a and the inside of the motor part M are communicated with each other through the gap g.

  Each blade 20 is provided so as to protrude from a wide portion of the gap g and approach the peripheral portion of the slinger 19 toward the central portion 4d. These blades 20 are formed so as to blow in the centrifugal direction by the rotation of the slinger 19.

  The electric blower of 2nd Embodiment is the same as 1st Embodiment including the structure which is not illustrated except the structure demonstrated above. Accordingly, also in the second embodiment, for the reason described in the first embodiment, the air in the motor part M leaks into the gap G of the fan part F through the second ball bearing 7 on the fan part side. It is possible to sufficiently suppress without mechanical loss.

  In addition, a blade 20 is disposed in a gap g formed by the slinger 19 and the case end face plate 4 of the electric motor case 2. Thereby, the air in the gap | interval g and the bearing inner space | gap 7a of the 2nd ball bearing 7 connected to this can be directly suck | inhaled by the ventilation effect | action of each blade | wing 20. FIG. For this reason, the pressure difference between the gap G on the fan part side and the electric motor part M becomes smaller, and there is an advantage that the leak can be more effectively suppressed.

  6 to 8 show a third embodiment. The third embodiment is different from the first embodiment in the configuration described below, and the other configurations are the same as those in the first embodiment. Therefore, the third embodiment has the same or similar functions as the first embodiment. Are denoted by the same reference numerals as in the first embodiment, and description thereof is omitted.

  The electric blower of the third embodiment is different from the first embodiment in the configuration of each blade 20 of the slinger 19.

  Specifically, each blade 20 is formed by cutting and raising the end face plate cover portion 19 b of the slinger 19. These blades 20 are cut obliquely toward the inside of the electric motor part M. Each blade 20 is tilted so that the root of the blade 20 is located upstream of the slinger 19 in the rotational direction C and the tip of the blade 20 is located downstream of the rotational direction C. The tip of each blade 20 is close to the armature winding 17a with respect to the root.

  When the slinger 19 is rotated together with the rotor 15, air is blown toward the armature winding 17 a along the axial direction of the rotor shaft 16. The air in the gap g communicating with the bearing gap 7a is sucked into the electric motor part M through the cut-and-raised mark of each blade 20 along with the air blow.

  The electric blower of 3rd Embodiment is the same as 1st Embodiment including the structure which is not illustrated except the structure demonstrated above. Therefore, also in the third embodiment, for the reason described in the first embodiment, the air in the motor part M leaks to the fan part F through the second ball bearing 7 on the fan side. It is possible to suppress sufficiently without accompanying.

  In addition, since each blade 20 is cut and raised, there is an advantage that it can be manufactured at low cost when the slinger 19 is made of metal.

  DESCRIPTION OF SYMBOLS 1 ... Electric blower, M ... Electric motor part, F ... Fan part, 2 ... Electric motor case, 4a ... Bearing housing part, 5, 7 ... Ball bearing, 7a ... Bearing inner clearance, 8 ... Inner ring, 9 ... Outer ring, 10 ... Steel Sphere, 11 ... Stator, 15 ... Rotor, 16 ... Rotor shaft, 19 ... Slinger, 20 ... Blade, g ... Gap, 31 ... Fan, G ... Gap, 45 ... Fan cover

Claims (2)

An electric motor case including an electric motor case and an electric motor portion including a rotor disposed therein together with a stator; a fan connected to the rotor; and a fan portion covering the fan and having a fan cover attached to the electric motor case; A ball bearing disposed in a bearing housing portion formed in the case supports the rotor shaft of the rotor, and the ball bearing in which the fan portion side portion of the rotor shaft is penetrated from the inside of the motor portion. In the electric blower attached so that the slinger that covers the rotor shaft is rotated integrally with the shaft,
An electric blower characterized in that the slinger is provided with blades that form an air flow for sucking air between an inner ring and an outer ring of the ball bearing through which the rotor shaft passes, into the electric motor part.   The blade is disposed between the slinger and the motor case opposed to the blade, and is disposed in a gap communicating between the inner ring and the outer ring so as to blow air in a centrifugal direction. The electric blower according to claim 1, wherein the electric blower is provided.

Images