JP2012077681A - Motor fan and vacuum cleaner equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor fan with a low friction factor seal member surely held by a fan cover with no need of a separate holding member and a vacuum cleaner equipped with the same.SOLUTION: The motor fan includes a motor part, a fan, the fan cover, the seal member and the holding member. The fan is rotated and driven by the motor part generating torque by energization. The fan cover has an air suction port disposed in an end part opposite to the motor part and contains the fan. The seal member is cylindrically disposed on the outer peripheral side of the air suction port of the fan cover in opposition to the fan. The seal member has a recessed part depressed toward the inner peripheral side in an outer peripheral wall and comes into contact with the fan to cut off an air flow passing through between the fan and the fan cover. The holding member is disposed on the outer peripheral side of the seal member, is cured after applied to be adhered to a fan-side surface of the fan cover and partially bites into the recessed part to hold the seal member to the fan cover.

Description

  Embodiments described herein relate generally to an electric blower and a vacuum cleaner including the same.

  The electric blower discharges the air sucked from the air suction port of the fan cover from the air discharge port by the fan driven by the electric part. At this time, a part of the air flow formed by the rotation of the fan may flow into the air suction port again through the gap between the fan and the fan cover. In this case, a flow of air circulating without being led to the air discharge port is formed between the fan and the fan cover, resulting in a decrease in blowing efficiency.

  Therefore, in the conventional electric blower, a seal member is provided on the fan cover facing the end opposite to the electric part of the fan, and the air flow from between the fan and the fan cover to the air inlet is blocked. Yes. Since such a sealing member is always in contact with the rotating fan, a low friction coefficient and high durability are required. However, a material with a low coefficient of friction generally has low adhesion to an adhesive and is difficult to hold on the fan cover. Further, when a holding member separate from the fan cover is used to hold the sealing member having low adhesiveness on the fan cover, the number of parts increases and the structure becomes complicated. Further, a separate holding member is required for each type of fan cover and fan.

JP 7-208390 A

  Therefore, an electric blower in which a sealing member having a low friction coefficient is securely held by a fan cover without requiring a separate holding member and a vacuum cleaner including the electric blower are provided.

  According to the electric blower of this embodiment, an electric part, a fan, a fan cover, a sealing member, and a holding member are provided. The electric part generates a rotational force when energized. The fan is rotationally driven by the electric unit. The fan cover has an air inlet provided at an end opposite to the electric part, and houses the fan. The seal member is provided in a cylindrical shape facing the fan on the outer peripheral side of the air intake port of the fan cover. The seal member has a concave portion that is recessed toward the inner peripheral side on the outer peripheral wall thereof, and a flow of air that passes between the end of the fan cover side of the fan and the fan cover by contacting the fan. Shut off. The holding member is provided on the outer peripheral side of the seal member, and adheres to the fan side surface of the fan cover by being cured after being applied in a liquid or semi-solid state. At the same time, a part of the holding member is inserted into the recess to hold the seal member on the fan cover.

Schematic which shows the external appearance of the vacuum cleaner which applied the electric blower by 1st Embodiment. Schematic sectional view showing a vacuum cleaner to which the electric blower according to the first embodiment is applied. Schematic sectional view showing the electric blower according to the first embodiment 1 is a schematic exploded perspective view showing an electric blower according to a first embodiment. Sectional drawing which expanded the principal part of the electric blower by 1st Embodiment The schematic diagram which expand | deployed the sealing member of the electric blower by 1st Embodiment to the circumferential direction, and was seen from the outer peripheral side Sectional view taken along line VII-VII in FIG. FIG. 7 equivalent view showing a modification of the sealing member of the electric blower according to the first embodiment. FIG. 7 equivalent view showing a modification of the sealing member of the electric blower according to the first embodiment. FIG. 6 equivalent view showing a sealing member of the electric blower according to the second embodiment. FIG. 6 is a view corresponding to FIG. 6 showing the sealing member of the electric blower according to the third embodiment.

Hereinafter, a vacuum cleaner to which an electric blower according to a plurality of embodiments is applied will be described with reference to the drawings. Note that, in a plurality of embodiments, substantially the same components are denoted by the same reference numerals, and description thereof is omitted.
(First embodiment)
The vacuum cleaner carrying the electric blower by 1st Embodiment is shown in FIG. 1 and FIG. As shown in FIG. 1, the vacuum cleaner 10 includes a vacuum cleaner body 11, an electric blower 12, a hose 13, a hand control tube 14, an extension tube 15, and a suction port member 16. As shown in FIG. 2, the vacuum cleaner body 11 has a dust collection chamber 17 and a storage chamber 18 formed therein. Hereinafter, the dust collection chamber 17 side of the vacuum cleaner body 11 is referred to as the front, and the storage chamber 18 side is referred to as the rear. The dust collection chamber 17 detachably houses a dust collection filter 19 such as a paper pack. The electric blower 12 generates a suction negative pressure for sucking air into the dust collection chamber 17. As shown in FIGS. 1 and 2, the electric vacuum cleaner main body 11 has a pair of wheels 21 on the left and right sides on the rear side, and a turning wheel 22 on the front side.

  The hose 13 has a connecting portion 23 on one end side, and a hand operating tube 14 is connected to the other end portion. The connection part 23 of the hose 13 is detachably connected to the connection port 24 of the vacuum cleaner main body 11. The hand operation tube 14 has a hand operation unit 25 provided with various operation switches. The hand control tube 14 has an extension tube 15 detachably connected to the end opposite to the hose 13. The suction port member 16 is detachably connected to the end of the extension tube 15, that is, on the opposite side of the extension tube 15 from the hand operation tube 14. The suction port member 16 forms a suction chamber (not shown) whose bottom surface is open. The suction chamber of the suction port member 16 communicates with the dust collection chamber 17 of the vacuum cleaner body 11 via the extension pipe 15 and the hose 13.

  The vacuum cleaner body 11 has a lower case 26, an upper case 27, a dust collection chamber cover 28, and the like. The lower case 26 is open at the upper side, that is, the end opposite to the wheel 21. The upper case 27 covers the upper part on the rear side of the lower case 26, and forms a storage chamber 18 that stores the electric blower 12 together with the lower case 26. The dust collection chamber cover 28 covers the upper side of the lower case 26 on the front side of the upper case 27. The dust collection chamber cover 28 rotates around a hinge (not shown). Thereby, the dust collection chamber cover 28 can open and close the dust collection chamber 17 formed between the lower case 26 and the dust collection chamber cover 28.

  The storage chamber 18 formed in the vacuum cleaner body 11 is largely divided into an electric motor chamber 31, a circuit chamber 32 and an exhaust chamber 33. The circuit chamber 32 is provided above the motor chamber 31. The exhaust chamber 33 is provided on the rear side of the motor chamber 31. A partition wall 34 partitions the motor chamber 31 and the circuit chamber 32. The circuit chamber 32 and the exhaust chamber 33 communicate with each other. The electric blower 12 is covered with a cover 35. The air discharged from the electric blower 12 is discharged to the exhaust chamber 33 through the hole 36 of the cover 35 and the hole 37 of the partition wall 34. The air discharged into the exhaust chamber 33 is discharged to the outside through a plurality of exhaust ports 38 formed at the rear end of the vacuum cleaner body 11. A circuit board 39 is provided on the partition wall 34 that partitions the circuit chamber 32. The circuit board 39 is provided with a control circuit (not shown) for controlling the electric blower 12.

Next, the electric blower 12 will be described in detail.
As shown in FIGS. 3 and 4, the electric blower 12 includes an electric unit 41, a fan 42, a fan cover 43, and the like. The electric part 41 has a body case 44 and a motor main body 45. The body case 44 is formed in a substantially cylindrical shape, and accommodates the motor main body 45 inside thereof. The body case 44 has an opening 46 formed at an end on the front side, which is one end in the axial direction. Further, the body case 44 is closed at the rear end, which is the other end, by the rear plate portion 47. The rear plate portion 47 has a motor head portion 49 that protrudes further rearward at the center portion and accommodates the bearing member 48 inside. The fuselage case 44 has a blower outlet 51 formed in the vicinity of the rear end on the cylindrical side wall. A pair of air outlets 51 are provided at both ends in the radial direction of the body case 44.

  The body case 44 has a bridge member 52 at an end on the front side. The bridge member 52 is formed in a plate shape extending in the radial direction from the center and covers a part of the opening 46. The bridge member 52 is held by the body case 44 at both ends in the radial direction by fastening members 53 such as screws. The bridge member 52 has a holding portion 55 that holds the bearing member 54 on the center side thereof. For example, a bearing member 54 such as a bearing is fixed to the holding portion 55 of the bridge member 52 by press fitting. A portion of the opening 46 that is not covered with the bridge member 52 forms a vent hole through which air discharged from the fan 42 flows.

  The motor main body 45 includes a field 57 that is a stator, an armature 58 that is a rotor, and a brush portion 59. The field 57 is formed in a cylindrical shape and is fixed to the body case 44. The armature 58 is arranged on the inner peripheral side of the field 57 concentrically with the field 57. End portions of the rotor shaft 61 that coincides with the axis of the armature 58 are supported by the bearing member 48 and the bearing member 54, respectively. As a result, the armature 58 coaxial with the body case 44 can rotate on the inner peripheral side of the field 57. A pair of brush portions 59 are fixed in the radial direction of the body case 44, and protrude from the inner peripheral surface of the body case 44 toward the armature 58. The brush part 59 has a carbon brush 62 and a brush holder 63. The carbon brush 62 slides on a commutator 64 provided on the armature 58. The brush holder 63 holds the carbon brush 62. As a result, the carbon brush 62 is pressed against the commutator 64 side of the armature 58 by the brush holder 63. As a result, the carbon brush 62 is in contact with the commutator 64, and the carbon brush 62 and the commutator 64 are electrically connected to each other.

  The electric blower 12 includes a diffuser 66. The diffuser 66 is fixed to the opposite side of the motor main body 45 of the bridge member 52, that is, the front side. Specifically, the diffuser 66 is fixed to the bridge member 52 so as to close the opening 46 of the body case 44. The fan 42 is provided further forward of the diffuser 66. The fan 42 is made of a lightweight and high heat resistant material such as an aluminum alloy. The fan 42 is a lower plate 71 formed in a disc shape, an upper plate 72 that faces the lower plate 71 in the axial direction at a predetermined interval, and a plurality of fans 42 provided between the lower plate 71 and the upper plate 72. The fan blade 73 is provided.

  The lower plate 71 has a mounting portion 74 at the center. The rotor shaft 61 of the motor main body 45 is integrally connected to the fan 42 at the mounting portion 74. Thereby, the fan 42 rotates together with the rotor shaft 61 of the motor main body 45. The lower plate 71 forms a slit (not shown) extending along the spiral shape. The upper plate 72 has a disk shape with an outer diameter substantially the same as that of the lower plate 71, and has a protruding cylindrical portion 75 at the center. The protruding cylinder portion 75 is formed in a trumpet shape that protrudes from the upper plate 72 while curving forward. The protruding cylindrical portion 75 of the upper plate 72 is open, and an air suction port 76 is formed on the inner peripheral side. Similar to the lower plate 71, the upper plate 72 forms a slit (not shown) that is symmetrical to the lower plate 71 and extends along a spiral shape.

  The fan blade 73 is formed in an elongated wall shape and is sandwiched between the lower plate 71 and the upper plate 72. The fan blade 73 has an end on the lower plate 71 side inserted into a slit (not shown) of the lower plate 71 and an end on the upper plate 72 side inserted into a slit (not shown) of the upper plate 72. The fan blades 73 inserted into the slits of the lower plate 71 and the upper plate 72 are integrally connected to the lower plate 71 and the upper plate 72 by caulking, for example. Thereby, the fan blades 73 are provided in a spiral shape from the center of the fan 42 to the outer edge side of the fan 42 along the slits formed in the lower plate 71 and the upper plate 72. As a result, the space formed between the opposed lower plate 71 and upper plate 72 is partitioned into a plurality of spiral intake passages 77 by the fan blades 73.

  The diffuser 66 has a disk-shaped disk part 81. The disc part 81 has a plurality of cutout parts 82 that are cut out in a triangular shape toward the center at equal intervals in the circumferential direction. Thereby, the outer edge of the disc part 81 of the diffuser 66 is formed in a saw blade shape. The diffuser 66 has a mounting portion 83 at the center. The holding portion 55 of the bridge member 52 is fixed inside the attachment portion 83.

  The disc part 81 has a plurality of upstream rectifying plates 84 rising on the surface on the fan 42 side in an axial direction perpendicular to the surface. The upstream flow straightening plate 84 extends forward from the surface of the disk portion 81 on the fan 42 side, and is formed in an arc wall shape that extends from the outer peripheral side to the center in the radial direction of the disk portion 81. The upstream rectifying plate 84 is provided in a spiral shape opposite to the spiral direction of the fan blade 73. The upstream rectifying plate 84 is positioned on the outermost peripheral side where the outer peripheral side end portion in the radial direction is not cut out in the disc portion 81 by the notch portion 82, and the inner peripheral end portion is the outer peripheral end of the fan 42. It is located outside the part. As a result, a fan accommodating portion 85 that is a space for accommodating the fan 42 is formed between the disc portion 81 and the upstream rectifying plate 84. Further, the intervals between the plurality of upstream rectifying plates 84 are increased toward the outer peripheral side of the disc portion 81. For this reason, the plurality of upstream rectifying plates 84 expand between each other toward the outer periphery, and form a guide air passage 86 connected to the notch portion 82 on the outer periphery side.

  The disc portion 81 has a plurality of downstream rectifying plates 87 rising on the surface opposite to the fan 42 in the axial direction perpendicular to the surface. The downstream rectifying plate 87 extends rearward from the surface of the disc portion 81 opposite to the fan 42 and is formed in an arc wall shape that extends from the outer peripheral side to the center in the radial direction of the disc portion 81. The downstream rectifying plate 87 is provided in a spiral shape opposite to the spiral direction of the upstream rectifying plate 84. The intervals between the plurality of downstream rectifying plates 87 are increased toward the outer peripheral side of the disc portion 81. For this reason, the plurality of downstream rectifying plates 87 form an airflow passage 88 that expands toward the outer periphery between them.

  The fan cover 43 is formed in a cylindrical shape, covers the fan 42 and the diffuser 66, and is fixed to the outer side of the body case 44. The fan cover 43 has a collar bottom portion 91 and a cylindrical portion 92. The bottom portion 91 is formed in an annular shape that covers the front end of the fan 42 and has an air suction port 93 that faces the air suction port 76 of the fan 42 at the center. The cylindrical portion 92 extends in a cylindrical shape from the outer peripheral end of the bottom portion 91 to the rear side. Accordingly, the fan cover 43 covers a part of the cylindrical portion 92 on the outer peripheral side of the body case 44.

  The electric blower 12 includes a seal member 95 and a holding member 96 as shown in FIG. The seal member 95 is provided on the outer peripheral side of the air intake port 93 of the fan cover 43. That is, the seal member 95 surrounds the outer peripheral side of the air suction port 93 formed by the fan cover 43 in the circumferential direction. Further, the seal member 95 faces the protruding cylindrical portion 75 of the fan 42. As a result, the projecting cylindrical portion 75 of the fan 42 has a seal member 95 that is harder at the front end. The fan 42 rotates in a state where the protruding cylindrical portion 75 is slightly inserted into the seal member 95. The holding member 96 is provided on the outer peripheral side of the seal member 95 and holds the seal member 95 on the fan cover 43. The seal member 95 is formed in an annular shape surrounding the outer peripheral side of the air suction port 93, and has a recess 98 that is recessed from the outer peripheral wall 97 to the inner peripheral side as shown in FIGS. 5 and 6. A plurality of recesses 98 are provided at predetermined intervals in the circumferential direction of the seal member 95.

  By the way, the air sucked from the air suction port 76 by the rotation of the fan 42 is guided to the outer peripheral side of the fan 42 through the intake passage 77 while being guided by the fan blades 73 by the centrifugal force accompanying the rotation of the fan 42. . The air guided to the outer peripheral side of the fan 42 is rectified by the upstream rectifying plate 84 and the downstream rectifying plate 87 of the diffuser 66 and then passes through a portion of the opening 46 that is not blocked by the bridge member 52. Flows into the body case 44. The air flowing into the body case 44 is discharged from the blower outlet 51 to the outside of the electric blower 12 via the outer peripheral side of the motor body 45 accommodated in the body case 44. At this time, if an air passage is formed between the projecting cylindrical portion 75 of the fan 42 and the fan cover 43, a part of the air guided to the outer peripheral side of the fan 42 by the rotation of the fan 42 is The air flows again into the air inlet 76 via the space between the portion 75 and the fan cover 43. Then, an air flow that circulates around the fan 42 is formed inside the fan cover 43. As a result, the electric blower 12 causes a reduction in efficiency.

  Therefore, in the present embodiment, by providing the fan cover 43 with the sealing member 95 into which the tip of the protruding cylindrical portion 75 is inserted, the space between the protruding cylindrical portion 75 of the fan 42 and the fan cover 43 is hermetically sealed. The air flow circulating through is interrupted. On the other hand, since the tip of the protruding cylindrical portion 75 rotates in a state where it is difficult to seal the seal member 95, the seal member 95 is preferably formed of a material having a low friction coefficient. Further, the tip of the protruding cylindrical portion 75 is not necessarily a perfect circle due to a dimensional error. Therefore, it is desirable that the seal member 95 be formed of a flexible material that absorbs the dimensional error of the protruding cylinder portion 75. In the present embodiment, the seal member 95 is formed of a flexible fluorine-containing resin such as rubber or foam. By forming the seal member 95 with a fluorine-containing resin, the heat resistance against friction with the fan 42 is high and the coefficient of friction is small, so that the rotation of the fan 42 is not hindered. Further, the seal member 95 is formed of a flexible material, and thereby absorbs a dimensional error of the protruding cylinder portion 75 by its own deformation. As a result, the seal member 95 is deformed while following the rotation of the fan 42, wraps around the protruding cylindrical portion 75 of the fan 42, and blocks the air flow.

  Thus, the sealing member 95 formed of a material having a small friction coefficient has low compatibility with the adhesive. In particular, when the seal member 95 is formed of a fluorine-containing resin such as polytetrafluoroethylene, it is difficult to sufficiently bond the seal member 95 and the fan cover 43 with an adhesive. When the seal member 95 is peeled off from the fan cover 43, the seal member 95 and the fan 42 contact irregularly, and the seal member 95 may be worn, and the seal member 95 may be scraped or peeled off. The debris generated from the seal member 95 and the peeled seal member 95 enter the inside of the fan 42 from the inner peripheral side of the projecting cylindrical portion 75 and accumulate on each portion, which may cause a malfunction of the electric blower 12.

  Therefore, the holding member 96 of this embodiment holds the seal member 95 on the fan cover 43. Specifically, the holding member 96 is formed of, for example, an epoxy resin, and is applied to the outer peripheral side of the seal member 95 in a liquid or semi-solid fluid state before curing. Then, the holding member 96 is cured after being applied, so that the holding member 96 adheres to the fan 42 side surface of the fan cover 43 and a part of the holding member 96 penetrates into the concave portion 98 of the seal member 95. As a result, the holding member 96 is fixed to the fan cover 43 by adhesion, and holds the seal member 95 by penetrating into the recess 98 and being cured. That is, since the fan cover 43 is made of, for example, metal or resin having high adhesiveness, the holding member 96 and the fan cover 43 are firmly bonded. On the other hand, the holding member 96 inserted into the recess 98 engages with the seal member 95 in a bowl shape by being cured, and restricts the seal member 95 from being peeled off to the fan 42 side. As a result, the seal member 95 is prevented from falling off from the fan cover 43. In this case, the holding member 96 may be continuously provided on the outer peripheral side of the seal member 95 in the circumferential direction, or may be provided at a predetermined interval in the circumferential direction at a position corresponding to the recess 98.

  As shown in FIG. 7, one end of the recess 98 opens to the outer peripheral wall 97 of the seal member 95, and is recessed halfway in the radial direction of the seal member 95. In this case, the pre-curing holding member 96 applied in a liquid or semi-solid state flows into the recess 98 due to its fluidity. When the holding member 96 is cured, the holding member 96 is in a state where the seal member 95 side is engaged with the recess 98. Here, the recess 98 may have a larger diameter on the inner peripheral side than the opening formed in the outer peripheral wall 97 of the seal member 95 as shown in FIG. As a result, the holding member 96 cured inside the recess 98 is tightly engaged with the seal member 95 and is difficult to come out of the recess 98 of the seal member 95. As a result, the seal member 95 is firmly held by the holding member 96, and the drop off from the fan cover 43 is more reliably prevented.

  Further, the seal member 95 may have an air hole 101 that connects the inner peripheral end of the recess 98 and the inner peripheral wall 99 of the seal member 95 as shown in FIG. 9. The air hole 101 is set to have a sufficiently smaller inner diameter than the recess 98. By providing the air hole 101 in the seal member 95, the air in the recess 98 is discharged to the outside of the seal member 95 via the air hole 101. Therefore, when the uncured holding member 96 is applied, the air present in the recess 98 is pushed out by the holding member 96 that enters the recess 98. As a result, the holding member 96 before curing is sufficiently filled to every corner of the recess 98. By making the inner diameter of the air hole 101 sufficiently small to allow air to escape, the filled holding member 96 does not ooze out to the inner peripheral wall 99 side of the seal member 95. As described above, the shape of the concave portion 98 can be variously changed in order to secure the holding force with the holding member 96.

  In the first embodiment described above, the holding member 96 is hardened by being hard to the recess 98 of the seal member 95. Therefore, the holding member 96 forms a state in which one end is bonded to the fan cover 43 and the other end is engaged with the recess 98 of the seal member 95. Thereby, the holding member 96 holds the seal member 95 on the fan cover 43 even if the adhesive force with the seal member 95 is small. Therefore, even when the seal member 95 that is difficult to bond is used, the seal member 95 having a small friction coefficient and the fan cover 43 can be securely and firmly held without using a separate holding member. .

In the first embodiment, the space between the projecting cylindrical portion 75 of the fan 42 and the fan cover 43 is sealed with a seal member 95 that is flexible and has a small friction coefficient. Therefore, the seal member 95 absorbs the dimensional error of the protruding cylindrical portion 75 while following the rotation of the fan 42. As a result, the formation of a circulating air flow passing between the projecting cylindrical portion 75 of the fan 42 and the fan cover 43 is reduced. Accordingly, it is possible to suppress a decrease in the blowing efficiency.
Furthermore, in the first embodiment, the holding member 96 is engaged with the seal member 95 at a plurality of positions in the circumferential direction by forming the recesses 98 at predetermined intervals in the circumferential direction of the seal member 95. Therefore, the holding member 96 not only restricts the dropout of the seal member 95 from the fan cover 43 but also restricts the rotation of the seal member 95 in the circumferential direction. Therefore, the movement of the seal member 95 and the wear and damage of the seal member 95 accompanying this can be reduced.
Furthermore, in 1st Embodiment, since the fall of the ventilation efficiency of the electric blower 12 is suppressed, the work rate of the vacuum cleaner 10 provided with this electric blower 12 can be improved more.
(Second Embodiment)
The principal part of the electric blower by 2nd Embodiment is shown in FIG.

In the case of the second embodiment, the recess 102 of the seal member 95 is an annular groove. That is, the concave portion 102 of the seal member 95 is formed in an annular shape that is continuous with the outer peripheral wall 97 of the seal member 95 in the circumferential direction. The recess 102 is recessed from the outer peripheral wall 97 of the seal member 95 to the inner peripheral side, as in the first embodiment. Further, the seal member 95 may have an air hole that connects the recess 102 and the inner peripheral side of the seal member 95 at an arbitrary position in the circumferential direction. By forming the annular recess 102 in the outer peripheral wall 97 of the seal member 95 in this way, the holding member 96 is engaged with the seal member 95 on the entire circumference in the circumferential direction.
In the second embodiment, the seal member 95 has a recess 102 that is continuous in the circumferential direction. Thereby, the holding member 96 holds the seal member 95 on the entire outer periphery wall 97 of the seal member 95. Therefore, even if the sealing member 95 is difficult to be bonded, the falling off from the fan cover 43 can be reduced.

(Third embodiment)
The principal part of the electric blower by 3rd Embodiment is shown in FIG.
In the case of the third embodiment, the recess 103 of the seal member 95 has an annular groove 104 and a notch groove 105. The annular groove 104 is provided in an annular shape that is continuous in the circumferential direction on the outer peripheral wall 97 of the seal member 95 as in the second embodiment. On the other hand, the notch groove 105 extends from the annular groove 104 continuous in the circumferential direction to the fan cover 43 side in the axial direction of the seal member 95. When the holding member 96 before being cured is applied, the holding member 96 is cured after flowing into both the annular groove 104 and the notch groove 105 due to its fluidity. The holding member 96 cured in the cutout groove 105 is in a state of rising from the fan cover 43 in a columnar shape in the axial direction. Therefore, the holding member 96 cured by the notch groove 105 restricts relative rotation between the seal member 95 and the fan cover 43 in the circumferential direction.

In the third embodiment, the seal member 95 has a notch groove 105 that extends in the axial direction at a predetermined position in the circumferential direction and is connected to the annular groove 104. Accordingly, the holding member 96 cured in the notch groove 105 is formed in a columnar shape that is substantially perpendicular to the relative rotation direction of the seal member 95 and the fan cover 43. Therefore, not only can the seal member 95 be prevented from falling off by the holding member 96, but also the relative rotation between the fan cover 43 and the seal member 95 can be limited by the holding member 96 cured by the notch groove 105.
The notch groove 105 may extend not only from the annular groove 104 to the fan cover 43 side but also from the annular groove 104 to the opposite side of the fan cover 43. That is, the notch groove 105 can be arbitrarily formed as long as it is in the axial direction of the seal member 95. By forming the notch groove 105 in the axial direction of the seal member 95 in this way, relative rotation between the seal member 95 and the fan cover 43 is limited.

(Other embodiments)
As mentioned above, although several embodiment of this invention was described, these embodiment was shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.
For example, a plurality of embodiments may be applied in combination. Specifically, the shape of the various concave portions 98 described in the first embodiment may be combined with the configuration of the seal member 95 of the third embodiment.

  In the drawing, 10 is a vacuum cleaner, 12 is an electric blower, 41 is an electric part, 42 is a fan, 43 is a fan cover, 76 is an air inlet, 95 is a sealing member, 96 is a holding member, 97 is an outer peripheral wall, 98 , 102, 103 are recesses, 104 is an annular groove, and 105 is a notch groove.

Claims (5)

An electric part that generates rotational force when energized;
A fan that is rotationally driven by the electric part;
A fan cover having an air inlet provided at an end opposite to the electric part, and housing the fan;
The fan cover is provided in a cylindrical shape on the outer peripheral side of the air suction port so as to face the fan, and has a concave portion recessed toward the inner peripheral side on an outer peripheral wall thereof. A seal member that blocks the flow of air passing between the end portion on the cover side and the fan cover;
It is provided on the outer peripheral side of the seal member, and is applied to the fan side surface of the fan cover by being cured after being applied in a liquid or semi-solid state, and a part of the fan cover is inserted into the recess so that the seal member is A holding member for holding the fan cover;
An electric blower.   The electric blower according to claim 1, wherein the recess is an annular groove that is continuous with the outer peripheral wall in the circumferential direction.   2. The electric blower according to claim 1, wherein the recess includes an annular groove that continues in a circumferential direction on the outer peripheral wall, and a notch groove that extends from the annular groove in an axial direction of the seal member.   The electric blower according to claim 1, wherein the seal member is made of a fluorine-containing resin.   An electric vacuum cleaner comprising the electric blower according to any one of claims 1 to 4.

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